sound/usb/usbaudio.c

   1 /*
   2  *   (Tentative) USB Audio Driver for ALSA
   3  *
   4  *   Main and PCM part
   5  *
   6  *   Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
   7  *
   8  *   Many codes borrowed from audio.c by
   9  *          Alan Cox (alan@lxorguk.ukuu.org.uk)
  10  *          Thomas Sailer (sailer@ife.ee.ethz.ch)
  11  *
  12  *
  13  *   This program is free software; you can redistribute it and/or modify
  14  *   it under the terms of the GNU General Public License as published by
  15  *   the Free Software Foundation; either version 2 of the License, or
  16  *   (at your option) any later version.
  17  *
  18  *   This program is distributed in the hope that it will be useful,
  19  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  *   GNU General Public License for more details.
  22  *
  23  *   You should have received a copy of the GNU General Public License
  24  *   along with this program; if not, write to the Free Software
  25  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  26  *
  27  *
  28  *  NOTES:
  29  *
  30  *   - async unlink should be used for avoiding the sleep inside lock.
  31  *     2.4.22 usb-uhci seems buggy for async unlinking and results in
  32  *     oops.  in such a cse, pass async_unlink=0 option.
  33  *   - the linked URBs would be preferred but not used so far because of
  34  *     the instability of unlinking.
  35  *   - type II is not supported properly.  there is no device which supports
  36  *     this type *correctly*.  SB extigy looks as if it supports, but it's
  37  *     indeed an AC3 stream packed in SPDIF frames (i.e. no real AC3 stream).
  38  */
  39
  40
  41 #include <linux/bitops.h>
  42 #include <linux/init.h>
  43 #include <linux/list.h>
  44 #include <linux/slab.h>
  45 #include <linux/string.h>
  46 #include <linux/usb.h>
  47 #include <linux/vmalloc.h>
  48 #include <linux/moduleparam.h>
  49 #include <linux/mutex.h>
  50 #include <sound/core.h>
  51 #include <sound/info.h>
  52 #include <sound/pcm.h>
  53 #include <sound/pcm_params.h>
  54 #include <sound/initval.h>
  55
  56 #include "usbaudio.h"
  57
  58
  59 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
  60 MODULE_DESCRIPTION("USB Audio");
  61 MODULE_LICENSE("GPL");
  62 MODULE_SUPPORTED_DEVICE("{{Generic,USB Audio}}");
  63
  64
  65 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
  66 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
  67 static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;      /* Enable this card */
  68 static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 }; /* Vendor ID for this card */
  69 static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 }; /* Product ID for this card */
  70 static int nrpacks = 8;         /* max. number of packets per urb */
  71 static int async_unlink = 1;
  72 static int device_setup[SNDRV_CARDS]; /* device parameter for this card*/
  73
  74 module_param_array(index, int, NULL, 0444);
  75 MODULE_PARM_DESC(index, "Index value for the USB audio adapter.");
  76 module_param_array(id, charp, NULL, 0444);
  77 MODULE_PARM_DESC(id, "ID string for the USB audio adapter.");
  78 module_param_array(enable, bool, NULL, 0444);
  79 MODULE_PARM_DESC(enable, "Enable USB audio adapter.");
  80 module_param_array(vid, int, NULL, 0444);
  81 MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device.");
  82 module_param_array(pid, int, NULL, 0444);
  83 MODULE_PARM_DESC(pid, "Product ID for the USB audio device.");
  84 module_param(nrpacks, int, 0644);
  85 MODULE_PARM_DESC(nrpacks, "Max. number of packets per URB.");
  86 module_param(async_unlink, bool, 0444);
  87 MODULE_PARM_DESC(async_unlink, "Use async unlink mode.");
  88 module_param_array(device_setup, int, NULL, 0444);
  89 MODULE_PARM_DESC(device_setup, "Specific device setup (if needed).");
  90
  91
  92 /*
  93  * debug the h/w constraints
  94  */
  95 /* #define HW_CONST_DEBUG */
  96
  97
  98 /*
  99  *
 100  */
 101
 102 #define MAX_PACKS       20
 103 #define MAX_PACKS_HS    (MAX_PACKS * 8) /* in high speed mode */
 104 #define MAX_URBS        8
 105 #define SYNC_URBS       4       /* always four urbs for sync */
 106 #define MIN_PACKS_URB   1       /* minimum 1 packet per urb */
 107
 108 struct audioformat {
 109         struct list_head list;
 110         snd_pcm_format_t format;        /* format type */
 111         unsigned int channels;          /* # channels */
 112         unsigned int fmt_type;          /* USB audio format type (1-3) */
 113         unsigned int frame_size;        /* samples per frame for non-audio */
 114         int iface;                      /* interface number */
 115         unsigned char altsetting;       /* corresponding alternate setting */
 116         unsigned char altset_idx;       /* array index of altenate setting */
 117         unsigned char attributes;       /* corresponding attributes of cs endpoint */
 118         unsigned char endpoint;         /* endpoint */
 119         unsigned char ep_attr;          /* endpoint attributes */
 120         unsigned int maxpacksize;       /* max. packet size */
 121         unsigned int rates;             /* rate bitmasks */
 122         unsigned int rate_min, rate_max;        /* min/max rates */
 123         unsigned int nr_rates;          /* number of rate table entries */
 124         unsigned int *rate_table;       /* rate table */
 125 };
 126
 127 struct snd_usb_substream;
 128
 129 struct snd_urb_ctx {
 130         struct urb *urb;
 131         unsigned int buffer_size;       /* size of data buffer, if data URB */
 132         struct snd_usb_substream *subs;
 133         int index;      /* index for urb array */
 134         int packets;    /* number of packets per urb */
 135 };
 136
 137 struct snd_urb_ops {
 138         int (*prepare)(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime, struct urb *u);
 139         int (*retire)(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime, struct urb *u);
 140         int (*prepare_sync)(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime, struct urb *u);
 141         int (*retire_sync)(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime, struct urb *u);
 142 };
 143
 144 struct snd_usb_substream {
 145         struct snd_usb_stream *stream;
 146         struct usb_device *dev;
 147         struct snd_pcm_substream *pcm_substream;
 148         int direction;  /* playback or capture */
 149         int interface;  /* current interface */
 150         int endpoint;   /* assigned endpoint */
 151         struct audioformat *cur_audiofmt;       /* current audioformat pointer (for hw_params callback) */
 152         unsigned int cur_rate;          /* current rate (for hw_params callback) */
 153         unsigned int period_bytes;      /* current period bytes (for hw_params callback) */
 154         unsigned int format;     /* USB data format */
 155         unsigned int datapipe;   /* the data i/o pipe */
 156         unsigned int syncpipe;   /* 1 - async out or adaptive in */
 157         unsigned int datainterval;      /* log_2 of data packet interval */
 158         unsigned int syncinterval;  /* P for adaptive mode, 0 otherwise */
 159         unsigned int freqn;      /* nominal sampling rate in fs/fps in Q16.16 format */
 160         unsigned int freqm;      /* momentary sampling rate in fs/fps in Q16.16 format */
 161         unsigned int freqmax;    /* maximum sampling rate, used for buffer management */
 162         unsigned int phase;      /* phase accumulator */
 163         unsigned int maxpacksize;       /* max packet size in bytes */
 164         unsigned int maxframesize;      /* max packet size in frames */
 165         unsigned int curpacksize;       /* current packet size in bytes (for capture) */
 166         unsigned int curframesize;      /* current packet size in frames (for capture) */
 167         unsigned int fill_max: 1;       /* fill max packet size always */
 168         unsigned int fmt_type;          /* USB audio format type (1-3) */
 169         unsigned int packs_per_ms;      /* packets per millisecond (for playback) */
 170
 171         unsigned int running: 1;        /* running status */
 172
 173         unsigned int hwptr_done;                        /* processed frame position in the buffer */
 174         unsigned int transfer_done;             /* processed frames since last period update */
 175         unsigned long active_mask;      /* bitmask of active urbs */
 176         unsigned long unlink_mask;      /* bitmask of unlinked urbs */
 177
 178         unsigned int nurbs;                     /* # urbs */
 179         struct snd_urb_ctx dataurb[MAX_URBS];   /* data urb table */
 180         struct snd_urb_ctx syncurb[SYNC_URBS];  /* sync urb table */
 181         char *syncbuf;                          /* sync buffer for all sync URBs */
 182         dma_addr_t sync_dma;                    /* DMA address of syncbuf */
 183
 184         u64 formats;                    /* format bitmasks (all or'ed) */
 185         unsigned int num_formats;               /* number of supported audio formats (list) */
 186         struct list_head fmt_list;      /* format list */
 187         struct snd_pcm_hw_constraint_list rate_list;    /* limited rates */
 188         spinlock_t lock;
 189
 190         struct snd_urb_ops ops;         /* callbacks (must be filled at init) */
 191 };
 192
 193
 194 struct snd_usb_stream {
 195         struct snd_usb_audio *chip;
 196         struct snd_pcm *pcm;
 197         int pcm_index;
 198         unsigned int fmt_type;          /* USB audio format type (1-3) */
 199         struct snd_usb_substream substream[2];
 200         struct list_head list;
 201 };
 202
 203
 204 /*
 205  * we keep the snd_usb_audio_t instances by ourselves for merging
 206  * the all interfaces on the same card as one sound device.
 207  */
 208
 209 static DEFINE_MUTEX(register_mutex);
 210 static struct snd_usb_audio *usb_chip[SNDRV_CARDS];
 211
 212
 213 /*
 214  * convert a sampling rate into our full speed format (fs/1000 in Q16.16)
 215  * this will overflow at approx 524 kHz
 216  */
 217 static inline unsigned get_usb_full_speed_rate(unsigned int rate)
 218 {
 219         return ((rate << 13) + 62) / 125;
 220 }
 221
 222 /*
 223  * convert a sampling rate into USB high speed format (fs/8000 in Q16.16)
 224  * this will overflow at approx 4 MHz
 225  */
 226 static inline unsigned get_usb_high_speed_rate(unsigned int rate)
 227 {
 228         return ((rate << 10) + 62) / 125;
 229 }
 230
 231 /* convert our full speed USB rate into sampling rate in Hz */
 232 static inline unsigned get_full_speed_hz(unsigned int usb_rate)
 233 {
 234         return (usb_rate * 125 + (1 << 12)) >> 13;
 235 }
 236
 237 /* convert our high speed USB rate into sampling rate in Hz */
 238 static inline unsigned get_high_speed_hz(unsigned int usb_rate)
 239 {
 240         return (usb_rate * 125 + (1 << 9)) >> 10;
 241 }
 242
 243
 244 /*
 245  * prepare urb for full speed capture sync pipe
 246  *
 247  * fill the length and offset of each urb descriptor.
 248  * the fixed 10.14 frequency is passed through the pipe.
 249  */
 250 static int prepare_capture_sync_urb(struct snd_usb_substream *subs,
 251                                     struct snd_pcm_runtime *runtime,
 252                                     struct urb *urb)
 253 {
 254         unsigned char *cp = urb->transfer_buffer;
 255         struct snd_urb_ctx *ctx = urb->context;
 256
 257         urb->dev = ctx->subs->dev; /* we need to set this at each time */
 258         urb->iso_frame_desc[0].length = 3;
 259         urb->iso_frame_desc[0].offset = 0;
 260         cp[0] = subs->freqn >> 2;
 261         cp[1] = subs->freqn >> 10;
 262         cp[2] = subs->freqn >> 18;
 263         return 0;
 264 }
 265
 266 /*
 267  * prepare urb for high speed capture sync pipe
 268  *
 269  * fill the length and offset of each urb descriptor.
 270  * the fixed 12.13 frequency is passed as 16.16 through the pipe.
 271  */
 272 static int prepare_capture_sync_urb_hs(struct snd_usb_substream *subs,
 273                                        struct snd_pcm_runtime *runtime,
 274                                        struct urb *urb)
 275 {
 276         unsigned char *cp = urb->transfer_buffer;
 277         struct snd_urb_ctx *ctx = urb->context;
 278
 279         urb->dev = ctx->subs->dev; /* we need to set this at each time */
 280         urb->iso_frame_desc[0].length = 4;
 281         urb->iso_frame_desc[0].offset = 0;
 282         cp[0] = subs->freqn;
 283         cp[1] = subs->freqn >> 8;
 284         cp[2] = subs->freqn >> 16;
 285         cp[3] = subs->freqn >> 24;
 286         return 0;
 287 }
 288
 289 /*
 290  * process after capture sync complete
 291  * - nothing to do
 292  */
 293 static int retire_capture_sync_urb(struct snd_usb_substream *subs,
 294                                    struct snd_pcm_runtime *runtime,
 295                                    struct urb *urb)
 296 {
 297         return 0;
 298 }
 299
 300 /*
 301  * prepare urb for capture data pipe
 302  *
 303  * fill the offset and length of each descriptor.
 304  *
 305  * we use a temporary buffer to write the captured data.
 306  * since the length of written data is determined by host, we cannot
 307  * write onto the pcm buffer directly...  the data is thus copied
 308  * later at complete callback to the global buffer.
 309  */
 310 static int prepare_capture_urb(struct snd_usb_substream *subs,
 311                                struct snd_pcm_runtime *runtime,
 312                                struct urb *urb)
 313 {
 314         int i, offs;
 315         struct snd_urb_ctx *ctx = urb->context;
 316
 317         offs = 0;
 318         urb->dev = ctx->subs->dev; /* we need to set this at each time */
 319         for (i = 0; i < ctx->packets; i++) {
 320                 urb->iso_frame_desc[i].offset = offs;
 321                 urb->iso_frame_desc[i].length = subs->curpacksize;
 322                 offs += subs->curpacksize;
 323         }
 324         urb->transfer_buffer_length = offs;
 325         urb->number_of_packets = ctx->packets;
 326         return 0;
 327 }
 328
 329 /*
 330  * process after capture complete
 331  *
 332  * copy the data from each desctiptor to the pcm buffer, and
 333  * update the current position.
 334  */
 335 static int retire_capture_urb(struct snd_usb_substream *subs,
 336                               struct snd_pcm_runtime *runtime,
 337                               struct urb *urb)
 338 {
 339         unsigned long flags;
 340         unsigned char *cp;
 341         int i;
 342         unsigned int stride, len, oldptr;
 343         int period_elapsed = 0;
 344
 345         stride = runtime->frame_bits >> 3;
 346
 347         for (i = 0; i < urb->number_of_packets; i++) {
 348                 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
 349                 if (urb->iso_frame_desc[i].status) {
 350                         snd_printd(KERN_ERR "frame %d active: %d\n", i, urb->iso_frame_desc[i].status);
 351                         // continue;
 352                 }
 353                 len = urb->iso_frame_desc[i].actual_length / stride;
 354                 if (! len)
 355                         continue;
 356                 /* update the current pointer */
 357                 spin_lock_irqsave(&subs->lock, flags);
 358                 oldptr = subs->hwptr_done;
 359                 subs->hwptr_done += len;
 360                 if (subs->hwptr_done >= runtime->buffer_size)
 361                         subs->hwptr_done -= runtime->buffer_size;
 362                 subs->transfer_done += len;
 363                 if (subs->transfer_done >= runtime->period_size) {
 364                         subs->transfer_done -= runtime->period_size;
 365                         period_elapsed = 1;
 366                 }
 367                 spin_unlock_irqrestore(&subs->lock, flags);
 368                 /* copy a data chunk */
 369                 if (oldptr + len > runtime->buffer_size) {
 370                         unsigned int cnt = runtime->buffer_size - oldptr;
 371                         unsigned int blen = cnt * stride;
 372                         memcpy(runtime->dma_area + oldptr * stride, cp, blen);
 373                         memcpy(runtime->dma_area, cp + blen, len * stride - blen);
 374                 } else {
 375                         memcpy(runtime->dma_area + oldptr * stride, cp, len * stride);
 376                 }
 377         }
 378         if (period_elapsed)
 379                 snd_pcm_period_elapsed(subs->pcm_substream);
 380         return 0;
 381 }
 382
 383 /*
 384  * Process after capture complete when paused.  Nothing to do.
 385  */
 386 static int retire_paused_capture_urb(struct snd_usb_substream *subs,
 387                                      struct snd_pcm_runtime *runtime,
 388                                      struct urb *urb)
 389 {
 390         return 0;
 391 }
 392
 393
 394 /*
 395  * prepare urb for full speed playback sync pipe
 396  *
 397  * set up the offset and length to receive the current frequency.
 398  */
 399
 400 static int prepare_playback_sync_urb(struct snd_usb_substream *subs,
 401                                      struct snd_pcm_runtime *runtime,
 402                                      struct urb *urb)
 403 {
 404         struct snd_urb_ctx *ctx = urb->context;
 405
 406         urb->dev = ctx->subs->dev; /* we need to set this at each time */
 407         urb->iso_frame_desc[0].length = 3;
 408         urb->iso_frame_desc[0].offset = 0;
 409         return 0;
 410 }
 411
 412 /*
 413  * prepare urb for high speed playback sync pipe
 414  *
 415  * set up the offset and length to receive the current frequency.
 416  */
 417
 418 static int prepare_playback_sync_urb_hs(struct snd_usb_substream *subs,
 419                                         struct snd_pcm_runtime *runtime,
 420                                         struct urb *urb)
 421 {
 422         struct snd_urb_ctx *ctx = urb->context;
 423
 424         urb->dev = ctx->subs->dev; /* we need to set this at each time */
 425         urb->iso_frame_desc[0].length = 4;
 426         urb->iso_frame_desc[0].offset = 0;
 427         return 0;
 428 }
 429
 430 /*
 431  * process after full speed playback sync complete
 432  *
 433  * retrieve the current 10.14 frequency from pipe, and set it.
 434  * the value is referred in prepare_playback_urb().
 435  */
 436 static int retire_playback_sync_urb(struct snd_usb_substream *subs,
 437                                     struct snd_pcm_runtime *runtime,
 438                                     struct urb *urb)
 439 {
 440         unsigned int f;
 441         unsigned long flags;
 442
 443         if (urb->iso_frame_desc[0].status == 0 &&
 444             urb->iso_frame_desc[0].actual_length == 3) {
 445                 f = combine_triple((u8*)urb->transfer_buffer) << 2;
 446                 if (f >= subs->freqn - subs->freqn / 8 && f <= subs->freqmax) {
 447                         spin_lock_irqsave(&subs->lock, flags);
 448                         subs->freqm = f;
 449                         spin_unlock_irqrestore(&subs->lock, flags);
 450                 }
 451         }
 452
 453         return 0;
 454 }
 455
 456 /*
 457  * process after high speed playback sync complete
 458  *
 459  * retrieve the current 12.13 frequency from pipe, and set it.
 460  * the value is referred in prepare_playback_urb().
 461  */
 462 static int retire_playback_sync_urb_hs(struct snd_usb_substream *subs,
 463                                        struct snd_pcm_runtime *runtime,
 464                                        struct urb *urb)
 465 {
 466         unsigned int f;
 467         unsigned long flags;
 468
 469         if (urb->iso_frame_desc[0].status == 0 &&
 470             urb->iso_frame_desc[0].actual_length == 4) {
 471                 f = combine_quad((u8*)urb->transfer_buffer) & 0x0fffffff;
 472                 if (f >= subs->freqn - subs->freqn / 8 && f <= subs->freqmax) {
 473                         spin_lock_irqsave(&subs->lock, flags);
 474                         subs->freqm = f;
 475                         spin_unlock_irqrestore(&subs->lock, flags);
 476                 }
 477         }
 478
 479         return 0;
 480 }
 481
 482 /* determine the number of frames in the next packet */
 483 static int snd_usb_audio_next_packet_size(struct snd_usb_substream *subs)
 484 {
 485         if (subs->fill_max)
 486                 return subs->maxframesize;
 487         else {
 488                 subs->phase = (subs->phase & 0xffff)
 489                         + (subs->freqm << subs->datainterval);
 490                 return min(subs->phase >> 16, subs->maxframesize);
 491         }
 492 }
 493
 494 /*
 495  * Prepare urb for streaming before playback starts or when paused.
 496  *
 497  * We don't have any data, so we send a frame of silence.
 498  */
 499 static int prepare_nodata_playback_urb(struct snd_usb_substream *subs,
 500                                        struct snd_pcm_runtime *runtime,
 501                                        struct urb *urb)
 502 {
 503         unsigned int i, offs, counts;
 504         struct snd_urb_ctx *ctx = urb->context;
 505         int stride = runtime->frame_bits >> 3;
 506
 507         offs = 0;
 508         urb->dev = ctx->subs->dev;
 509         urb->number_of_packets = subs->packs_per_ms;
 510         for (i = 0; i < subs->packs_per_ms; ++i) {
 511                 counts = snd_usb_audio_next_packet_size(subs);
 512                 urb->iso_frame_desc[i].offset = offs * stride;
 513                 urb->iso_frame_desc[i].length = counts * stride;
 514                 offs += counts;
 515         }
 516         urb->transfer_buffer_length = offs * stride;
 517         memset(urb->transfer_buffer,
 518                subs->cur_audiofmt->format == SNDRV_PCM_FORMAT_U8 ? 0x80 : 0,
 519                offs * stride);
 520         return 0;
 521 }
 522
 523 /*
 524  * prepare urb for playback data pipe
 525  *
 526  * Since a URB can handle only a single linear buffer, we must use double
 527  * buffering when the data to be transferred overflows the buffer boundary.
 528  * To avoid inconsistencies when updating hwptr_done, we use double buffering
 529  * for all URBs.
 530  */
 531 static int prepare_playback_urb(struct snd_usb_substream *subs,
 532                                 struct snd_pcm_runtime *runtime,
 533                                 struct urb *urb)
 534 {
 535         int i, stride, offs;
 536         unsigned int counts;
 537         unsigned long flags;
 538         int period_elapsed = 0;
 539         struct snd_urb_ctx *ctx = urb->context;
 540
 541         stride = runtime->frame_bits >> 3;
 542
 543         offs = 0;
 544         urb->dev = ctx->subs->dev; /* we need to set this at each time */
 545         urb->number_of_packets = 0;
 546         spin_lock_irqsave(&subs->lock, flags);
 547         for (i = 0; i < ctx->packets; i++) {
 548                 counts = snd_usb_audio_next_packet_size(subs);
 549                 /* set up descriptor */
 550                 urb->iso_frame_desc[i].offset = offs * stride;
 551                 urb->iso_frame_desc[i].length = counts * stride;
 552                 offs += counts;
 553                 urb->number_of_packets++;
 554                 subs->transfer_done += counts;
 555                 if (subs->transfer_done >= runtime->period_size) {
 556                         subs->transfer_done -= runtime->period_size;
 557                         period_elapsed = 1;
 558                         if (subs->fmt_type == USB_FORMAT_TYPE_II) {
 559                                 if (subs->transfer_done > 0) {
 560                                         /* FIXME: fill-max mode is not
 561                                          * supported yet */
 562                                         offs -= subs->transfer_done;
 563                                         counts -= subs->transfer_done;
 564                                         urb->iso_frame_desc[i].length =
 565                                                 counts * stride;
 566                                         subs->transfer_done = 0;
 567                                 }
 568                                 i++;
 569                                 if (i < ctx->packets) {
 570                                         /* add a transfer delimiter */
 571                                         urb->iso_frame_desc[i].offset =
 572                                                 offs * stride;
 573                                         urb->iso_frame_desc[i].length = 0;
 574                                         urb->number_of_packets++;
 575                                 }
 576                                 break;
 577                         }
 578                 }
 579                 /* finish at the frame boundary at/after the period boundary */
 580                 if (period_elapsed &&
 581                     (i & (subs->packs_per_ms - 1)) == subs->packs_per_ms - 1)
 582                         break;
 583         }
 584         if (subs->hwptr_done + offs > runtime->buffer_size) {
 585                 /* err, the transferred area goes over buffer boundary. */
 586                 unsigned int len = runtime->buffer_size - subs->hwptr_done;
 587                 memcpy(urb->transfer_buffer,
 588                        runtime->dma_area + subs->hwptr_done * stride,
 589                        len * stride);
 590                 memcpy(urb->transfer_buffer + len * stride,
 591                        runtime->dma_area,
 592                        (offs - len) * stride);
 593         } else {
 594                 memcpy(urb->transfer_buffer,
 595                        runtime->dma_area + subs->hwptr_done * stride,
 596                        offs * stride);
 597         }
 598         subs->hwptr_done += offs;
 599         if (subs->hwptr_done >= runtime->buffer_size)
 600                 subs->hwptr_done -= runtime->buffer_size;
 601         spin_unlock_irqrestore(&subs->lock, flags);
 602         urb->transfer_buffer_length = offs * stride;
 603         if (period_elapsed)
 604                 snd_pcm_period_elapsed(subs->pcm_substream);
 605         return 0;
 606 }
 607
 608 /*
 609  * process after playback data complete
 610  * - nothing to do
 611  */
 612 static int retire_playback_urb(struct snd_usb_substream *subs,
 613                                struct snd_pcm_runtime *runtime,
 614                                struct urb *urb)
 615 {
 616         return 0;
 617 }
 618
 619
 620 /*
 621  */
 622 static struct snd_urb_ops audio_urb_ops[2] = {
 623         {
 624                 .prepare =      prepare_nodata_playback_urb,
 625                 .retire =       retire_playback_urb,
 626                 .prepare_sync = prepare_playback_sync_urb,
 627                 .retire_sync =  retire_playback_sync_urb,
 628         },
 629         {
 630                 .prepare =      prepare_capture_urb,
 631                 .retire =       retire_capture_urb,
 632                 .prepare_sync = prepare_capture_sync_urb,
 633                 .retire_sync =  retire_capture_sync_urb,
 634         },
 635 };
 636
 637 static struct snd_urb_ops audio_urb_ops_high_speed[2] = {
 638         {
 639                 .prepare =      prepare_nodata_playback_urb,
 640                 .retire =       retire_playback_urb,
 641                 .prepare_sync = prepare_playback_sync_urb_hs,
 642                 .retire_sync =  retire_playback_sync_urb_hs,
 643         },
 644         {
 645                 .prepare =      prepare_capture_urb,
 646                 .retire =       retire_capture_urb,
 647                 .prepare_sync = prepare_capture_sync_urb_hs,
 648                 .retire_sync =  retire_capture_sync_urb,
 649         },
 650 };
 651
 652 /*
 653  * complete callback from data urb
 654  */
 655 static void snd_complete_urb(struct urb *urb)
 656 {
 657         struct snd_urb_ctx *ctx = urb->context;
 658         struct snd_usb_substream *subs = ctx->subs;
 659         struct snd_pcm_substream *substream = ctx->subs->pcm_substream;
 660         int err = 0;
 661
 662         if ((subs->running && subs->ops.retire(subs, substream->runtime, urb)) ||
 663             ! subs->running || /* can be stopped during retire callback */
 664             (err = subs->ops.prepare(subs, substream->runtime, urb)) < 0 ||
 665             (err = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
 666                 clear_bit(ctx->index, &subs->active_mask);
 667                 if (err < 0) {
 668                         snd_printd(KERN_ERR "cannot submit urb (err = %d)\n", err);
 669                         snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
 670                 }
 671         }
 672 }
 673
 674
 675 /*
 676  * complete callback from sync urb
 677  */
 678 static void snd_complete_sync_urb(struct urb *urb)
 679 {
 680         struct snd_urb_ctx *ctx = urb->context;
 681         struct snd_usb_substream *subs = ctx->subs;
 682         struct snd_pcm_substream *substream = ctx->subs->pcm_substream;
 683         int err = 0;
 684
 685         if ((subs->running && subs->ops.retire_sync(subs, substream->runtime, urb)) ||
 686             ! subs->running || /* can be stopped during retire callback */
 687             (err = subs->ops.prepare_sync(subs, substream->runtime, urb)) < 0 ||
 688             (err = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
 689                 clear_bit(ctx->index + 16, &subs->active_mask);
 690                 if (err < 0) {
 691                         snd_printd(KERN_ERR "cannot submit sync urb (err = %d)\n", err);
 692                         snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
 693                 }
 694         }
 695 }
 696
 697
 698 /* get the physical page pointer at the given offset */
 699 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
 700                                              unsigned long offset)
 701 {
 702         void *pageptr = subs->runtime->dma_area + offset;
 703         return vmalloc_to_page(pageptr);
 704 }
 705
 706 /* allocate virtual buffer; may be called more than once */
 707 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs, size_t size)
 708 {
 709         struct snd_pcm_runtime *runtime = subs->runtime;
 710         if (runtime->dma_area) {
 711                 if (runtime->dma_bytes >= size)
 712                         return 0; /* already large enough */
 713                 vfree(runtime->dma_area);
 714         }
 715         runtime->dma_area = vmalloc(size);
 716         if (! runtime->dma_area)
 717                 return -ENOMEM;
 718         runtime->dma_bytes = size;
 719         return 0;
 720 }
 721
 722 /* free virtual buffer; may be called more than once */
 723 static int snd_pcm_free_vmalloc_buffer(struct snd_pcm_substream *subs)
 724 {
 725         struct snd_pcm_runtime *runtime = subs->runtime;
 726
 727         vfree(runtime->dma_area);
 728         runtime->dma_area = NULL;
 729         return 0;
 730 }
 731
 732
 733 /*
 734  * unlink active urbs.
 735  */
 736 static int deactivate_urbs(struct snd_usb_substream *subs, int force, int can_sleep)
 737 {
 738         unsigned int i;
 739         int async;
 740
 741         subs->running = 0;
 742
 743         if (!force && subs->stream->chip->shutdown) /* to be sure... */
 744                 return -EBADFD;
 745
 746         async = !can_sleep && async_unlink;
 747
 748         if (! async && in_interrupt())
 749                 return 0;
 750
 751         for (i = 0; i < subs->nurbs; i++) {
 752                 if (test_bit(i, &subs->active_mask)) {
 753                         if (! test_and_set_bit(i, &subs->unlink_mask)) {
 754                                 struct urb *u = subs->dataurb[i].urb;
 755                                 if (async)
 756                                         usb_unlink_urb(u);
 757                                 else
 758                                         usb_kill_urb(u);
 759                         }
 760                 }
 761         }
 762         if (subs->syncpipe) {
 763                 for (i = 0; i < SYNC_URBS; i++) {
 764                         if (test_bit(i+16, &subs->active_mask)) {
 765                                 if (! test_and_set_bit(i+16, &subs->unlink_mask)) {
 766                                         struct urb *u = subs->syncurb[i].urb;
 767                                         if (async)
 768                                                 usb_unlink_urb(u);
 769                                         else
 770                                                 usb_kill_urb(u);
 771                                 }
 772                         }
 773                 }
 774         }
 775         return 0;
 776 }
 777
 778
 779 static const char *usb_error_string(int err)
 780 {
 781         switch (err) {
 782         case -ENODEV:
 783                 return "no device";
 784         case -ENOENT:
 785                 return "endpoint not enabled";
 786         case -EPIPE:
 787                 return "endpoint stalled";
 788         case -ENOSPC:
 789                 return "not enough bandwidth";
 790         case -ESHUTDOWN:
 791                 return "device disabled";
 792         case -EHOSTUNREACH:
 793                 return "device suspended";
 794 #ifndef CONFIG_USB_EHCI_SPLIT_ISO
 795         case -ENOSYS:
 796                 return "enable CONFIG_USB_EHCI_SPLIT_ISO to play through a hub";
 797 #endif
 798         case -EINVAL:
 799         case -EAGAIN:
 800         case -EFBIG:
 801         case -EMSGSIZE:
 802                 return "internal error";
 803         default:
 804                 return "unknown error";
 805         }
 806 }
 807
 808 /*
 809  * set up and start data/sync urbs
 810  */
 811 static int start_urbs(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime)
 812 {
 813         unsigned int i;
 814         int err;
 815
 816         if (subs->stream->chip->shutdown)
 817                 return -EBADFD;
 818
 819         for (i = 0; i < subs->nurbs; i++) {
 820                 snd_assert(subs->dataurb[i].urb, return -EINVAL);
 821                 if (subs->ops.prepare(subs, runtime, subs->dataurb[i].urb) < 0) {
 822                         snd_printk(KERN_ERR "cannot prepare datapipe for urb %d\n", i);
 823                         goto __error;
 824                 }
 825         }
 826         if (subs->syncpipe) {
 827                 for (i = 0; i < SYNC_URBS; i++) {
 828                         snd_assert(subs->syncurb[i].urb, return -EINVAL);
 829                         if (subs->ops.prepare_sync(subs, runtime, subs->syncurb[i].urb) < 0) {
 830                                 snd_printk(KERN_ERR "cannot prepare syncpipe for urb %d\n", i);
 831                                 goto __error;
 832                         }
 833                 }
 834         }
 835
 836         subs->active_mask = 0;
 837         subs->unlink_mask = 0;
 838         subs->running = 1;
 839         for (i = 0; i < subs->nurbs; i++) {
 840                 err = usb_submit_urb(subs->dataurb[i].urb, GFP_ATOMIC);
 841                 if (err < 0) {
 842                         snd_printk(KERN_ERR "cannot submit datapipe "
 843                                    "for urb %d, error %d: %s\n",
 844                                    i, err, usb_error_string(err));
 845                         goto __error;
 846                 }
 847                 set_bit(i, &subs->active_mask);
 848         }
 849         if (subs->syncpipe) {
 850                 for (i = 0; i < SYNC_URBS; i++) {
 851                         err = usb_submit_urb(subs->syncurb[i].urb, GFP_ATOMIC);
 852                         if (err < 0) {
 853                                 snd_printk(KERN_ERR "cannot submit syncpipe "
 854                                            "for urb %d, error %d: %s\n",
 855                                            i, err, usb_error_string(err));
 856                                 goto __error;
 857                         }
 858                         set_bit(i + 16, &subs->active_mask);
 859                 }
 860         }
 861         return 0;
 862
 863  __error:
 864         // snd_pcm_stop(subs->pcm_substream, SNDRV_PCM_STATE_XRUN);
 865         deactivate_urbs(subs, 0, 0);
 866         return -EPIPE;
 867 }
 868
 869
 870 /*
 871  *  wait until all urbs are processed.
 872  */
 873 static int wait_clear_urbs(struct snd_usb_substream *subs)
 874 {
 875         unsigned long end_time = jiffies + msecs_to_jiffies(1000);
 876         unsigned int i;
 877         int alive;
 878
 879         do {
 880                 alive = 0;
 881                 for (i = 0; i < subs->nurbs; i++) {
 882                         if (test_bit(i, &subs->active_mask))
 883                                 alive++;
 884                 }
 885                 if (subs->syncpipe) {
 886                         for (i = 0; i < SYNC_URBS; i++) {
 887                                 if (test_bit(i + 16, &subs->active_mask))
 888                                         alive++;
 889                         }
 890                 }
 891                 if (! alive)
 892                         break;
 893                 schedule_timeout_uninterruptible(1);
 894         } while (time_before(jiffies, end_time));
 895         if (alive)
 896                 snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive);
 897         return 0;
 898 }
 899
 900
 901 /*
 902  * return the current pcm pointer.  just return the hwptr_done value.
 903  */
 904 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
 905 {
 906         struct snd_usb_substream *subs;
 907         snd_pcm_uframes_t hwptr_done;
 908
 909         subs = (struct snd_usb_substream *)substream->runtime->private_data;
 910         spin_lock(&subs->lock);
 911         hwptr_done = subs->hwptr_done;
 912         spin_unlock(&subs->lock);
 913         return hwptr_done;
 914 }
 915
 916
 917 /*
 918  * start/stop playback substream
 919  */
 920 static int snd_usb_pcm_playback_trigger(struct snd_pcm_substream *substream,
 921                                         int cmd)
 922 {
 923         struct snd_usb_substream *subs = substream->runtime->private_data;
 924
 925         switch (cmd) {
 926         case SNDRV_PCM_TRIGGER_START:
 927         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 928                 subs->ops.prepare = prepare_playback_urb;
 929                 return 0;
 930         case SNDRV_PCM_TRIGGER_STOP:
 931                 return deactivate_urbs(subs, 0, 0);
 932         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 933                 subs->ops.prepare = prepare_nodata_playback_urb;
 934                 return 0;
 935         default:
 936                 return -EINVAL;
 937         }
 938 }
 939
 940 /*
 941  * start/stop capture substream
 942  */
 943 static int snd_usb_pcm_capture_trigger(struct snd_pcm_substream *substream,
 944                                        int cmd)
 945 {
 946         struct snd_usb_substream *subs = substream->runtime->private_data;
 947
 948         switch (cmd) {
 949         case SNDRV_PCM_TRIGGER_START:
 950                 subs->ops.retire = retire_capture_urb;
 951                 return start_urbs(subs, substream->runtime);
 952         case SNDRV_PCM_TRIGGER_STOP:
 953                 return deactivate_urbs(subs, 0, 0);
 954         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 955                 subs->ops.retire = retire_paused_capture_urb;
 956                 return 0;
 957         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 958                 subs->ops.retire = retire_capture_urb;
 959                 return 0;
 960         default:
 961                 return -EINVAL;
 962         }
 963 }
 964
 965
 966 /*
 967  * release a urb data
 968  */
 969 static void release_urb_ctx(struct snd_urb_ctx *u)
 970 {
 971         if (u->urb) {
 972                 if (u->buffer_size)
 973                         usb_buffer_free(u->subs->dev, u->buffer_size,
 974                                         u->urb->transfer_buffer,
 975                                         u->urb->transfer_dma);
 976                 usb_free_urb(u->urb);
 977                 u->urb = NULL;
 978         }
 979 }
 980
 981 /*
 982  * release a substream
 983  */
 984 static void release_substream_urbs(struct snd_usb_substream *subs, int force)
 985 {
 986         int i;
 987
 988         /* stop urbs (to be sure) */
 989         deactivate_urbs(subs, force, 1);
 990         wait_clear_urbs(subs);
 991
 992         for (i = 0; i < MAX_URBS; i++)
 993                 release_urb_ctx(&subs->dataurb[i]);
 994         for (i = 0; i < SYNC_URBS; i++)
 995                 release_urb_ctx(&subs->syncurb[i]);
 996         usb_buffer_free(subs->dev, SYNC_URBS * 4,
 997                         subs->syncbuf, subs->sync_dma);
 998         subs->syncbuf = NULL;
 999         subs->nurbs = 0;
1000 }
1001
1002 /*
1003  * initialize a substream for plaback/capture
1004  */
1005 static int init_substream_urbs(struct snd_usb_substream *subs, unsigned int period_bytes,
1006                                unsigned int rate, unsigned int frame_bits)
1007 {
1008         unsigned int maxsize, n, i;
1009         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
1010         unsigned int npacks[MAX_URBS], urb_packs, total_packs, packs_per_ms;
1011
1012         /* calculate the frequency in 16.16 format */
1013         if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
1014                 subs->freqn = get_usb_full_speed_rate(rate);
1015         else
1016                 subs->freqn = get_usb_high_speed_rate(rate);
1017         subs->freqm = subs->freqn;
1018         /* calculate max. frequency */
1019         if (subs->maxpacksize) {
1020                 /* whatever fits into a max. size packet */
1021                 maxsize = subs->maxpacksize;
1022                 subs->freqmax = (maxsize / (frame_bits >> 3))
1023                                 << (16 - subs->datainterval);
1024         } else {
1025                 /* no max. packet size: just take 25% higher than nominal */
1026                 subs->freqmax = subs->freqn + (subs->freqn >> 2);
1027                 maxsize = ((subs->freqmax + 0xffff) * (frame_bits >> 3))
1028                                 >> (16 - subs->datainterval);
1029         }
1030         subs->phase = 0;
1031
1032         if (subs->fill_max)
1033                 subs->curpacksize = subs->maxpacksize;
1034         else
1035                 subs->curpacksize = maxsize;
1036
1037         if (snd_usb_get_speed(subs->dev) == USB_SPEED_HIGH)
1038                 packs_per_ms = 8 >> subs->datainterval;
1039         else
1040                 packs_per_ms = 1;
1041         subs->packs_per_ms = packs_per_ms;
1042
1043         if (is_playback) {
1044                 urb_packs = nrpacks;
1045                 urb_packs = max(urb_packs, (unsigned int)MIN_PACKS_URB);
1046                 urb_packs = min(urb_packs, (unsigned int)MAX_PACKS);
1047         } else
1048                 urb_packs = 1;
1049         urb_packs *= packs_per_ms;
1050
1051         /* decide how many packets to be used */
1052         if (is_playback) {
1053                 unsigned int minsize;
1054                 /* determine how small a packet can be */
1055                 minsize = (subs->freqn >> (16 - subs->datainterval))
1056                           * (frame_bits >> 3);
1057                 /* with sync from device, assume it can be 12% lower */
1058                 if (subs->syncpipe)
1059                         minsize -= minsize >> 3;
1060                 minsize = max(minsize, 1u);
1061                 total_packs = (period_bytes + minsize - 1) / minsize;
1062                 /* round up to multiple of packs_per_ms */
1063                 total_packs = (total_packs + packs_per_ms - 1)
1064                                 & ~(packs_per_ms - 1);
1065                 /* we need at least two URBs for queueing */
1066                 if (total_packs < 2 * MIN_PACKS_URB * packs_per_ms)
1067                         total_packs = 2 * MIN_PACKS_URB * packs_per_ms;
1068         } else {
1069                 total_packs = MAX_URBS * urb_packs;
1070         }
1071         subs->nurbs = (total_packs + urb_packs - 1) / urb_packs;
1072         if (subs->nurbs > MAX_URBS) {
1073                 /* too much... */
1074                 subs->nurbs = MAX_URBS;
1075                 total_packs = MAX_URBS * urb_packs;
1076         }
1077         n = total_packs;
1078         for (i = 0; i < subs->nurbs; i++) {
1079                 npacks[i] = n > urb_packs ? urb_packs : n;
1080                 n -= urb_packs;
1081         }
1082         if (subs->nurbs <= 1) {
1083                 /* too little - we need at least two packets
1084                  * to ensure contiguous playback/capture
1085                  */
1086                 subs->nurbs = 2;
1087                 npacks[0] = (total_packs + 1) / 2;
1088                 npacks[1] = total_packs - npacks[0];
1089         } else if (npacks[subs->nurbs-1] < MIN_PACKS_URB * packs_per_ms) {
1090                 /* the last packet is too small.. */
1091                 if (subs->nurbs > 2) {
1092                         /* merge to the first one */
1093                         npacks[0] += npacks[subs->nurbs - 1];
1094                         subs->nurbs--;
1095                 } else {
1096                         /* divide to two */
1097                         subs->nurbs = 2;
1098                         npacks[0] = (total_packs + 1) / 2;
1099                         npacks[1] = total_packs - npacks[0];
1100                 }
1101         }
1102
1103         /* allocate and initialize data urbs */
1104         for (i = 0; i < subs->nurbs; i++) {
1105                 struct snd_urb_ctx *u = &subs->dataurb[i];
1106                 u->index = i;
1107                 u->subs = subs;
1108                 u->packets = npacks[i];
1109                 u->buffer_size = maxsize * u->packets;
1110                 if (subs->fmt_type == USB_FORMAT_TYPE_II)
1111                         u->packets++; /* for transfer delimiter */
1112                 u->urb = usb_alloc_urb(u->packets, GFP_KERNEL);
1113                 if (! u->urb)
1114                         goto out_of_memory;
1115                 u->urb->transfer_buffer =
1116                         usb_buffer_alloc(subs->dev, u->buffer_size, GFP_KERNEL,
1117                                          &u->urb->transfer_dma);
1118                 if (! u->urb->transfer_buffer)
1119                         goto out_of_memory;
1120                 u->urb->pipe = subs->datapipe;
1121                 u->urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
1122                 u->urb->interval = 1 << subs->datainterval;
1123                 u->urb->context = u;
1124                 u->urb->complete = snd_complete_urb;
1125         }
1126
1127         if (subs->syncpipe) {
1128                 /* allocate and initialize sync urbs */
1129                 subs->syncbuf = usb_buffer_alloc(subs->dev, SYNC_URBS * 4,
1130                                                  GFP_KERNEL, &subs->sync_dma);
1131                 if (! subs->syncbuf)
1132                         goto out_of_memory;
1133                 for (i = 0; i < SYNC_URBS; i++) {
1134                         struct snd_urb_ctx *u = &subs->syncurb[i];
1135                         u->index = i;
1136                         u->subs = subs;
1137                         u->packets = 1;
1138                         u->urb = usb_alloc_urb(1, GFP_KERNEL);
1139                         if (! u->urb)
1140                                 goto out_of_memory;
1141                         u->urb->transfer_buffer = subs->syncbuf + i * 4;
1142                         u->urb->transfer_dma = subs->sync_dma + i * 4;
1143                         u->urb->transfer_buffer_length = 4;
1144                         u->urb->pipe = subs->syncpipe;
1145                         u->urb->transfer_flags = URB_ISO_ASAP |
1146                                                  URB_NO_TRANSFER_DMA_MAP;
1147                         u->urb->number_of_packets = 1;
1148                         u->urb->interval = 1 << subs->syncinterval;
1149                         u->urb->context = u;
1150                         u->urb->complete = snd_complete_sync_urb;
1151                 }
1152         }
1153         return 0;
1154
1155 out_of_memory:
1156         release_substream_urbs(subs, 0);
1157         return -ENOMEM;
1158 }
1159
1160
1161 /*
1162  * find a matching audio format
1163  */
1164 static struct audioformat *find_format(struct snd_usb_substream *subs, unsigned int format,
1165                                        unsigned int rate, unsigned int channels)
1166 {
1167         struct list_head *p;
1168         struct audioformat *found = NULL;
1169         int cur_attr = 0, attr;
1170
1171         list_for_each(p, &subs->fmt_list) {
1172                 struct audioformat *fp;
1173                 fp = list_entry(p, struct audioformat, list);
1174                 if (fp->format != format || fp->channels != channels)
1175                         continue;
1176                 if (rate < fp->rate_min || rate > fp->rate_max)
1177                         continue;
1178                 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
1179                         unsigned int i;
1180                         for (i = 0; i < fp->nr_rates; i++)
1181                                 if (fp->rate_table[i] == rate)
1182                                         break;
1183                         if (i >= fp->nr_rates)
1184                                 continue;
1185                 }
1186                 attr = fp->ep_attr & EP_ATTR_MASK;
1187                 if (! found) {
1188                         found = fp;
1189                         cur_attr = attr;
1190                         continue;
1191                 }
1192                 /* avoid async out and adaptive in if the other method
1193                  * supports the same format.
1194                  * this is a workaround for the case like
1195                  * M-audio audiophile USB.
1196                  */
1197                 if (attr != cur_attr) {
1198                         if ((attr == EP_ATTR_ASYNC &&
1199                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
1200                             (attr == EP_ATTR_ADAPTIVE &&
1201                              subs->direction == SNDRV_PCM_STREAM_CAPTURE))
1202                                 continue;
1203                         if ((cur_attr == EP_ATTR_ASYNC &&
1204                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
1205                             (cur_attr == EP_ATTR_ADAPTIVE &&
1206                              subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
1207                                 found = fp;
1208                                 cur_attr = attr;
1209                                 continue;
1210                         }
1211                 }
1212                 /* find the format with the largest max. packet size */
1213                 if (fp->maxpacksize > found->maxpacksize) {
1214                         found = fp;
1215                         cur_attr = attr;
1216                 }
1217         }
1218         return found;
1219 }
1220
1221
1222 /*
1223  * initialize the picth control and sample rate
1224  */
1225 static int init_usb_pitch(struct usb_device *dev, int iface,
1226                           struct usb_host_interface *alts,
1227                           struct audioformat *fmt)
1228 {
1229         unsigned int ep;
1230         unsigned char data[1];
1231         int err;
1232
1233         ep = get_endpoint(alts, 0)->bEndpointAddress;
1234         /* if endpoint has pitch control, enable it */
1235         if (fmt->attributes & EP_CS_ATTR_PITCH_CONTROL) {
1236                 data[0] = 1;
1237                 if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), SET_CUR,
1238                                            USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
1239                                            PITCH_CONTROL << 8, ep, data, 1, 1000)) < 0) {
1240                         snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH\n",
1241                                    dev->devnum, iface, ep);
1242                         return err;
1243                 }
1244         }
1245         return 0;
1246 }
1247
1248 static int init_usb_sample_rate(struct usb_device *dev, int iface,
1249                                 struct usb_host_interface *alts,
1250                                 struct audioformat *fmt, int rate)
1251 {
1252         unsigned int ep;
1253         unsigned char data[3];
1254         int err;
1255
1256         ep = get_endpoint(alts, 0)->bEndpointAddress;
1257         /* if endpoint has sampling rate control, set it */
1258         if (fmt->attributes & EP_CS_ATTR_SAMPLE_RATE) {
1259                 int crate;
1260                 data[0] = rate;
1261                 data[1] = rate >> 8;
1262                 data[2] = rate >> 16;
1263                 if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), SET_CUR,
1264                                            USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
1265                                            SAMPLING_FREQ_CONTROL << 8, ep, data, 3, 1000)) < 0) {
1266                         snd_printk(KERN_ERR "%d:%d:%d: cannot set freq %d to ep 0x%x\n",
1267                                    dev->devnum, iface, fmt->altsetting, rate, ep);
1268                         return err;
1269                 }
1270                 if ((err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), GET_CUR,
1271                                            USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_IN,
1272                                            SAMPLING_FREQ_CONTROL << 8, ep, data, 3, 1000)) < 0) {
1273                         snd_printk(KERN_WARNING "%d:%d:%d: cannot get freq at ep 0x%x\n",
1274                                    dev->devnum, iface, fmt->altsetting, ep);
1275                         return 0; /* some devices don't support reading */
1276                 }
1277                 crate = data[0] | (data[1] << 8) | (data[2] << 16);
1278                 if (crate != rate) {
1279                         snd_printd(KERN_WARNING "current rate %d is different from the runtime rate %d\n", crate, rate);
1280                         // runtime->rate = crate;
1281                 }
1282         }
1283         return 0;
1284 }
1285
1286 /*
1287  * find a matching format and set up the interface
1288  */
1289 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
1290 {
1291         struct usb_device *dev = subs->dev;
1292         struct usb_host_interface *alts;
1293         struct usb_interface_descriptor *altsd;
1294         struct usb_interface *iface;
1295         unsigned int ep, attr;
1296         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
1297         int err;
1298
1299         iface = usb_ifnum_to_if(dev, fmt->iface);
1300         snd_assert(iface, return -EINVAL);
1301         alts = &iface->altsetting[fmt->altset_idx];
1302         altsd = get_iface_desc(alts);
1303         snd_assert(altsd->bAlternateSetting == fmt->altsetting, return -EINVAL);
1304
1305         if (fmt == subs->cur_audiofmt)
1306                 return 0;
1307
1308         /* close the old interface */
1309         if (subs->interface >= 0 && subs->interface != fmt->iface) {
1310                 if (usb_set_interface(subs->dev, subs->interface, 0) < 0) {
1311                         snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed\n",
1312                                 dev->devnum, fmt->iface, fmt->altsetting);
1313                         return -EIO;
1314                 }
1315                 subs->interface = -1;
1316                 subs->format = 0;
1317         }
1318
1319         /* set interface */
1320         if (subs->interface != fmt->iface || subs->format != fmt->altset_idx) {
1321                 if (usb_set_interface(dev, fmt->iface, fmt->altsetting) < 0) {
1322                         snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed\n",
1323                                    dev->devnum, fmt->iface, fmt->altsetting);
1324                         return -EIO;
1325                 }
1326                 snd_printdd(KERN_INFO "setting usb interface %d:%d\n", fmt->iface, fmt->altsetting);
1327                 subs->interface = fmt->iface;
1328                 subs->format = fmt->altset_idx;
1329         }
1330
1331         /* create a data pipe */
1332         ep = fmt->endpoint & USB_ENDPOINT_NUMBER_MASK;
1333         if (is_playback)
1334                 subs->datapipe = usb_sndisocpipe(dev, ep);
1335         else
1336                 subs->datapipe = usb_rcvisocpipe(dev, ep);
1337         if (snd_usb_get_speed(subs->dev) == USB_SPEED_HIGH &&
1338             get_endpoint(alts, 0)->bInterval >= 1 &&
1339             get_endpoint(alts, 0)->bInterval <= 4)
1340                 subs->datainterval = get_endpoint(alts, 0)->bInterval - 1;
1341         else
1342                 subs->datainterval = 0;
1343         subs->syncpipe = subs->syncinterval = 0;
1344         subs->maxpacksize = fmt->maxpacksize;
1345         subs->fill_max = 0;
1346
1347         /* we need a sync pipe in async OUT or adaptive IN mode */
1348         /* check the number of EP, since some devices have broken
1349          * descriptors which fool us.  if it has only one EP,
1350          * assume it as adaptive-out or sync-in.
1351          */
1352         attr = fmt->ep_attr & EP_ATTR_MASK;
1353         if (((is_playback && attr == EP_ATTR_ASYNC) ||
1354              (! is_playback && attr == EP_ATTR_ADAPTIVE)) &&
1355             altsd->bNumEndpoints >= 2) {
1356                 /* check sync-pipe endpoint */
1357                 /* ... and check descriptor size before accessing bSynchAddress
1358                    because there is a version of the SB Audigy 2 NX firmware lacking
1359                    the audio fields in the endpoint descriptors */
1360                 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != 0x01 ||
1361                     (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
1362                      get_endpoint(alts, 1)->bSynchAddress != 0)) {
1363                         snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
1364                                    dev->devnum, fmt->iface, fmt->altsetting);
1365                         return -EINVAL;
1366                 }
1367                 ep = get_endpoint(alts, 1)->bEndpointAddress;
1368                 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
1369                     (( is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
1370                      (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
1371                         snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
1372                                    dev->devnum, fmt->iface, fmt->altsetting);
1373                         return -EINVAL;
1374                 }
1375                 ep &= USB_ENDPOINT_NUMBER_MASK;
1376                 if (is_playback)
1377                         subs->syncpipe = usb_rcvisocpipe(dev, ep);
1378                 else
1379                         subs->syncpipe = usb_sndisocpipe(dev, ep);
1380                 if (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
1381                     get_endpoint(alts, 1)->bRefresh >= 1 &&
1382                     get_endpoint(alts, 1)->bRefresh <= 9)
1383                         subs->syncinterval = get_endpoint(alts, 1)->bRefresh;
1384                 else if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
1385                         subs->syncinterval = 1;
1386                 else if (get_endpoint(alts, 1)->bInterval >= 1 &&
1387                          get_endpoint(alts, 1)->bInterval <= 16)
1388                         subs->syncinterval = get_endpoint(alts, 1)->bInterval - 1;
1389                 else
1390                         subs->syncinterval = 3;
1391         }
1392
1393         /* always fill max packet size */
1394         if (fmt->attributes & EP_CS_ATTR_FILL_MAX)
1395                 subs->fill_max = 1;
1396
1397         if ((err = init_usb_pitch(dev, subs->interface, alts, fmt)) < 0)
1398                 return err;
1399
1400         subs->cur_audiofmt = fmt;
1401
1402 #if 0
1403         printk("setting done: format = %d, rate = %d, channels = %d\n",
1404                fmt->format, fmt->rate, fmt->channels);
1405         printk("  datapipe = 0x%0x, syncpipe = 0x%0x\n",
1406                subs->datapipe, subs->syncpipe);
1407 #endif
1408
1409         return 0;
1410 }
1411
1412 /*
1413  * hw_params callback
1414  *
1415  * allocate a buffer and set the given audio format.
1416  *
1417  * so far we use a physically linear buffer although packetize transfer
1418  * doesn't need a continuous area.
1419  * if sg buffer is supported on the later version of alsa, we'll follow
1420  * that.
1421  */
1422 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
1423                              struct snd_pcm_hw_params *hw_params)
1424 {
1425         struct snd_usb_substream *subs = substream->runtime->private_data;
1426         struct audioformat *fmt;
1427         unsigned int channels, rate, format;
1428         int ret, changed;
1429
1430         ret = snd_pcm_alloc_vmalloc_buffer(substream,
1431                                            params_buffer_bytes(hw_params));
1432         if (ret < 0)
1433                 return ret;
1434
1435         format = params_format(hw_params);
1436         rate = params_rate(hw_params);
1437         channels = params_channels(hw_params);
1438         fmt = find_format(subs, format, rate, channels);
1439         if (! fmt) {
1440                 snd_printd(KERN_DEBUG "cannot set format: format = 0x%x, rate = %d, channels = %d\n",
1441                            format, rate, channels);
1442                 return -EINVAL;
1443         }
1444
1445         changed = subs->cur_audiofmt != fmt ||
1446                 subs->period_bytes != params_period_bytes(hw_params) ||
1447                 subs->cur_rate != rate;
1448         if ((ret = set_format(subs, fmt)) < 0)
1449                 return ret;
1450
1451         if (subs->cur_rate != rate) {
1452                 struct usb_host_interface *alts;
1453                 struct usb_interface *iface;
1454                 iface = usb_ifnum_to_if(subs->dev, fmt->iface);
1455                 alts = &iface->altsetting[fmt->altset_idx];
1456                 ret = init_usb_sample_rate(subs->dev, subs->interface, alts, fmt, rate);
1457                 if (ret < 0)
1458                         return ret;
1459                 subs->cur_rate = rate;
1460         }
1461
1462         if (changed) {
1463                 /* format changed */
1464                 release_substream_urbs(subs, 0);
1465                 /* influenced: period_bytes, channels, rate, format, */
1466                 ret = init_substream_urbs(subs, params_period_bytes(hw_params),
1467                                           params_rate(hw_params),
1468                                           snd_pcm_format_physical_width(params_format(hw_params)) * params_channels(hw_params));
1469         }
1470
1471         return ret;
1472 }
1473
1474 /*
1475  * hw_free callback
1476  *
1477  * reset the audio format and release the buffer
1478  */
1479 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
1480 {
1481         struct snd_usb_substream *subs = substream->runtime->private_data;
1482
1483         subs->cur_audiofmt = NULL;
1484         subs->cur_rate = 0;
1485         subs->period_bytes = 0;
1486         if (!subs->stream->chip->shutdown)
1487                 release_substream_urbs(subs, 0);
1488         return snd_pcm_free_vmalloc_buffer(substream);
1489 }
1490
1491 /*
1492  * prepare callback
1493  *
1494  * only a few subtle things...
1495  */
1496 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
1497 {
1498         struct snd_pcm_runtime *runtime = substream->runtime;
1499         struct snd_usb_substream *subs = runtime->private_data;
1500
1501         if (! subs->cur_audiofmt) {
1502                 snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
1503                 return -ENXIO;
1504         }
1505
1506         /* some unit conversions in runtime */
1507         subs->maxframesize = bytes_to_frames(runtime, subs->maxpacksize);
1508         subs->curframesize = bytes_to_frames(runtime, subs->curpacksize);
1509
1510         /* reset the pointer */
1511         subs->hwptr_done = 0;
1512         subs->transfer_done = 0;
1513         subs->phase = 0;
1514
1515         /* clear urbs (to be sure) */
1516         deactivate_urbs(subs, 0, 1);
1517         wait_clear_urbs(subs);
1518
1519         /* for playback, submit the URBs now; otherwise, the first hwptr_done
1520          * updates for all URBs would happen at the same time when starting */
1521         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) {
1522                 subs->ops.prepare = prepare_nodata_playback_urb;
1523                 return start_urbs(subs, runtime);
1524         } else
1525                 return 0;
1526 }
1527
1528 static struct snd_pcm_hardware snd_usb_hardware =
1529 {
1530         .info =                 SNDRV_PCM_INFO_MMAP |
1531                                 SNDRV_PCM_INFO_MMAP_VALID |
1532                                 SNDRV_PCM_INFO_BATCH |
1533                                 SNDRV_PCM_INFO_INTERLEAVED |
1534                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
1535                                 SNDRV_PCM_INFO_PAUSE,
1536         .buffer_bytes_max =     1024 * 1024,
1537         .period_bytes_min =     64,
1538         .period_bytes_max =     512 * 1024,
1539         .periods_min =          2,
1540         .periods_max =          1024,
1541 };
1542
1543 /*
1544  * h/w constraints
1545  */
1546
1547 #ifdef HW_CONST_DEBUG
1548 #define hwc_debug(fmt, args...) printk(KERN_DEBUG fmt, ##args)
1549 #else
1550 #define hwc_debug(fmt, args...) /**/
1551 #endif
1552
1553 static int hw_check_valid_format(struct snd_pcm_hw_params *params, struct audioformat *fp)
1554 {
1555         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1556         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
1557         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1558
1559         /* check the format */
1560         if (! snd_mask_test(fmts, fp->format)) {
1561                 hwc_debug("   > check: no supported format %d\n", fp->format);
1562                 return 0;
1563         }
1564         /* check the channels */
1565         if (fp->channels < ct->min || fp->channels > ct->max) {
1566                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
1567                 return 0;
1568         }
1569         /* check the rate is within the range */
1570         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
1571                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
1572                 return 0;
1573         }
1574         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
1575                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
1576                 return 0;
1577         }
1578         return 1;
1579 }
1580
1581 static int hw_rule_rate(struct snd_pcm_hw_params *params,
1582                         struct snd_pcm_hw_rule *rule)
1583 {
1584         struct snd_usb_substream *subs = rule->private;
1585         struct list_head *p;
1586         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1587         unsigned int rmin, rmax;
1588         int changed;
1589
1590         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
1591         changed = 0;
1592         rmin = rmax = 0;
1593         list_for_each(p, &subs->fmt_list) {
1594                 struct audioformat *fp;
1595                 fp = list_entry(p, struct audioformat, list);
1596                 if (! hw_check_valid_format(params, fp))
1597                         continue;
1598                 if (changed++) {
1599                         if (rmin > fp->rate_min)
1600                                 rmin = fp->rate_min;
1601                         if (rmax < fp->rate_max)
1602                                 rmax = fp->rate_max;
1603                 } else {
1604                         rmin = fp->rate_min;
1605                         rmax = fp->rate_max;
1606                 }
1607         }
1608
1609         if (! changed) {
1610                 hwc_debug("  --> get empty\n");
1611                 it->empty = 1;
1612                 return -EINVAL;
1613         }
1614
1615         changed = 0;
1616         if (it->min < rmin) {
1617                 it->min = rmin;
1618                 it->openmin = 0;
1619                 changed = 1;
1620         }
1621         if (it->max > rmax) {
1622                 it->max = rmax;
1623                 it->openmax = 0;
1624                 changed = 1;
1625         }
1626         if (snd_interval_checkempty(it)) {
1627                 it->empty = 1;
1628                 return -EINVAL;
1629         }
1630         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1631         return changed;
1632 }
1633
1634
1635 static int hw_rule_channels(struct snd_pcm_hw_params *params,
1636                             struct snd_pcm_hw_rule *rule)
1637 {
1638         struct snd_usb_substream *subs = rule->private;
1639         struct list_head *p;
1640         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
1641         unsigned int rmin, rmax;
1642         int changed;
1643
1644         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
1645         changed = 0;
1646         rmin = rmax = 0;
1647         list_for_each(p, &subs->fmt_list) {
1648                 struct audioformat *fp;
1649                 fp = list_entry(p, struct audioformat, list);
1650                 if (! hw_check_valid_format(params, fp))
1651                         continue;
1652                 if (changed++) {
1653                         if (rmin > fp->channels)
1654                                 rmin = fp->channels;
1655                         if (rmax < fp->channels)
1656                                 rmax = fp->channels;
1657                 } else {
1658                         rmin = fp->channels;
1659                         rmax = fp->channels;
1660                 }
1661         }
1662
1663         if (! changed) {
1664                 hwc_debug("  --> get empty\n");
1665                 it->empty = 1;
1666                 return -EINVAL;
1667         }
1668
1669         changed = 0;
1670         if (it->min < rmin) {
1671                 it->min = rmin;
1672                 it->openmin = 0;
1673                 changed = 1;
1674         }
1675         if (it->max > rmax) {
1676                 it->max = rmax;
1677                 it->openmax = 0;
1678                 changed = 1;
1679         }
1680         if (snd_interval_checkempty(it)) {
1681                 it->empty = 1;
1682                 return -EINVAL;
1683         }
1684         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1685         return changed;
1686 }
1687
1688 static int hw_rule_format(struct snd_pcm_hw_params *params,
1689                           struct snd_pcm_hw_rule *rule)
1690 {
1691         struct snd_usb_substream *subs = rule->private;
1692         struct list_head *p;
1693         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1694         u64 fbits;
1695         u32 oldbits[2];
1696         int changed;
1697
1698         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
1699         fbits = 0;
1700         list_for_each(p, &subs->fmt_list) {
1701                 struct audioformat *fp;
1702                 fp = list_entry(p, struct audioformat, list);
1703                 if (! hw_check_valid_format(params, fp))
1704                         continue;
1705                 fbits |= (1ULL << fp->format);
1706         }
1707
1708         oldbits[0] = fmt->bits[0];
1709         oldbits[1] = fmt->bits[1];
1710         fmt->bits[0] &= (u32)fbits;
1711         fmt->bits[1] &= (u32)(fbits >> 32);
1712         if (! fmt->bits[0] && ! fmt->bits[1]) {
1713                 hwc_debug("  --> get empty\n");
1714                 return -EINVAL;
1715         }
1716         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1717         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1718         return changed;
1719 }
1720
1721 #define MAX_MASK        64
1722
1723 /*
1724  * check whether the registered audio formats need special hw-constraints
1725  */
1726 static int check_hw_params_convention(struct snd_usb_substream *subs)
1727 {
1728         int i;
1729         u32 *channels;
1730         u32 *rates;
1731         u32 cmaster, rmaster;
1732         u32 rate_min = 0, rate_max = 0;
1733         struct list_head *p;
1734         int err = 1;
1735
1736         channels = kcalloc(MAX_MASK, sizeof(u32), GFP_KERNEL);
1737         rates = kcalloc(MAX_MASK, sizeof(u32), GFP_KERNEL);
1738
1739         list_for_each(p, &subs->fmt_list) {
1740                 struct audioformat *f;
1741                 f = list_entry(p, struct audioformat, list);
1742                 /* unconventional channels? */
1743                 if (f->channels > 32)
1744                         goto __out;
1745                 /* continuous rate min/max matches? */
1746                 if (f->rates & SNDRV_PCM_RATE_CONTINUOUS) {
1747                         if (rate_min && f->rate_min != rate_min)
1748                                 goto __out;
1749                         if (rate_max && f->rate_max != rate_max)
1750                                 goto __out;
1751                         rate_min = f->rate_min;
1752                         rate_max = f->rate_max;
1753                 }
1754                 /* combination of continuous rates and fixed rates? */
1755                 if (rates[f->format] & SNDRV_PCM_RATE_CONTINUOUS) {
1756                         if (f->rates != rates[f->format])
1757                                 goto __out;
1758                 }
1759                 if (f->rates & SNDRV_PCM_RATE_CONTINUOUS) {
1760                         if (rates[f->format] && rates[f->format] != f->rates)
1761                                 goto __out;
1762                 }
1763                 channels[f->format] |= (1 << f->channels);
1764                 rates[f->format] |= f->rates;
1765                 /* needs knot? */
1766                 if (f->rates & SNDRV_PCM_RATE_KNOT)
1767                         goto __out;
1768         }
1769         /* check whether channels and rates match for all formats */
1770         cmaster = rmaster = 0;
1771         for (i = 0; i < MAX_MASK; i++) {
1772                 if (cmaster != channels[i] && cmaster && channels[i])
1773                         goto __out;
1774                 if (rmaster != rates[i] && rmaster && rates[i])
1775                         goto __out;
1776                 if (channels[i])
1777                         cmaster = channels[i];
1778                 if (rates[i])
1779                         rmaster = rates[i];
1780         }
1781         /* check whether channels match for all distinct rates */
1782         memset(channels, 0, MAX_MASK * sizeof(u32));
1783         list_for_each(p, &subs->fmt_list) {
1784                 struct audioformat *f;
1785                 f = list_entry(p, struct audioformat, list);
1786                 if (f->rates & SNDRV_PCM_RATE_CONTINUOUS)
1787                         continue;
1788                 for (i = 0; i < 32; i++) {
1789                         if (f->rates & (1 << i))
1790                                 channels[i] |= (1 << f->channels);
1791                 }
1792         }
1793         cmaster = 0;
1794         for (i = 0; i < 32; i++) {
1795                 if (cmaster != channels[i] && cmaster && channels[i])
1796                         goto __out;
1797                 if (channels[i])
1798                         cmaster = channels[i];
1799         }
1800         err = 0;
1801
1802  __out:
1803         kfree(channels);
1804         kfree(rates);
1805         return err;
1806 }
1807
1808 /*
1809  *  If the device supports unusual bit rates, does the request meet these?
1810  */
1811 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1812                                   struct snd_usb_substream *subs)
1813 {
1814         struct audioformat *fp;
1815         int count = 0, needs_knot = 0;
1816         int err;
1817
1818         list_for_each_entry(fp, &subs->fmt_list, list) {
1819                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1820                         return 0;
1821                 count += fp->nr_rates;
1822                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
1823                         needs_knot = 1;
1824         }
1825         if (!needs_knot)
1826                 return 0;
1827
1828         subs->rate_list.count = count;
1829         subs->rate_list.list = kmalloc(sizeof(int) * count, GFP_KERNEL);
1830         subs->rate_list.mask = 0;
1831         count = 0;
1832         list_for_each_entry(fp, &subs->fmt_list, list) {
1833                 int i;
1834                 for (i = 0; i < fp->nr_rates; i++)
1835                         subs->rate_list.list[count++] = fp->rate_table[i];
1836         }
1837         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1838                                          &subs->rate_list);
1839         if (err < 0)
1840                 return err;
1841
1842         return 0;
1843 }
1844
1845
1846 /*
1847  * set up the runtime hardware information.
1848  */
1849
1850 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1851 {
1852         struct list_head *p;
1853         int err;
1854
1855         runtime->hw.formats = subs->formats;
1856
1857         runtime->hw.rate_min = 0x7fffffff;
1858         runtime->hw.rate_max = 0;
1859         runtime->hw.channels_min = 256;
1860         runtime->hw.channels_max = 0;
1861         runtime->hw.rates = 0;
1862         /* check min/max rates and channels */
1863         list_for_each(p, &subs->fmt_list) {
1864                 struct audioformat *fp;
1865                 fp = list_entry(p, struct audioformat, list);
1866                 runtime->hw.rates |= fp->rates;
1867                 if (runtime->hw.rate_min > fp->rate_min)
1868                         runtime->hw.rate_min = fp->rate_min;
1869                 if (runtime->hw.rate_max < fp->rate_max)
1870                         runtime->hw.rate_max = fp->rate_max;
1871                 if (runtime->hw.channels_min > fp->channels)
1872                         runtime->hw.channels_min = fp->channels;
1873                 if (runtime->hw.channels_max < fp->channels)
1874                         runtime->hw.channels_max = fp->channels;
1875                 if (fp->fmt_type == USB_FORMAT_TYPE_II && fp->frame_size > 0) {
1876                         /* FIXME: there might be more than one audio formats... */
1877                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1878                                 fp->frame_size;
1879                 }
1880         }
1881
1882         /* set the period time minimum 1ms */
1883         /* FIXME: high-speed mode allows 125us minimum period, but many parts
1884          * in the current code assume the 1ms period.
1885          */
1886         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1887                                      1000 * MIN_PACKS_URB,
1888                                      /*(nrpacks * MAX_URBS) * 1000*/ UINT_MAX);
1889
1890         if (check_hw_params_convention(subs)) {
1891                 hwc_debug("setting extra hw constraints...\n");
1892                 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1893                                                hw_rule_rate, subs,
1894                                                SNDRV_PCM_HW_PARAM_FORMAT,
1895                                                SNDRV_PCM_HW_PARAM_CHANNELS,
1896                                                -1)) < 0)
1897                         return err;
1898                 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1899                                                hw_rule_channels, subs,
1900                                                SNDRV_PCM_HW_PARAM_FORMAT,
1901                                                SNDRV_PCM_HW_PARAM_RATE,
1902                                                -1)) < 0)
1903                         return err;
1904                 if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1905                                                hw_rule_format, subs,
1906                                                SNDRV_PCM_HW_PARAM_RATE,
1907                                                SNDRV_PCM_HW_PARAM_CHANNELS,
1908                                                -1)) < 0)
1909                         return err;
1910                 if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
1911                         return err;
1912         }
1913         return 0;
1914 }
1915
1916 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
1917 {
1918         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1919         struct snd_pcm_runtime *runtime = substream->runtime;
1920         struct snd_usb_substream *subs = &as->substream[direction];
1921
1922         subs->interface = -1;
1923         subs->format = 0;
1924         runtime->hw = snd_usb_hardware;
1925         runtime->private_data = subs;
1926         subs->pcm_substream = substream;
1927         return setup_hw_info(runtime, subs);
1928 }
1929
1930 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
1931 {
1932         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1933         struct snd_usb_substream *subs = &as->substream[direction];
1934
1935         if (subs->interface >= 0) {
1936                 usb_set_interface(subs->dev, subs->interface, 0);
1937                 subs->interface = -1;
1938         }
1939         subs->pcm_substream = NULL;
1940         return 0;
1941 }
1942
1943 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
1944 {
1945         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
1946 }
1947
1948 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
1949 {
1950         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
1951 }
1952
1953 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
1954 {
1955         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
1956 }
1957
1958 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
1959 {
1960         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
1961 }
1962
1963 static struct snd_pcm_ops snd_usb_playback_ops = {
1964         .open =         snd_usb_playback_open,
1965         .close =        snd_usb_playback_close,
1966         .ioctl =        snd_pcm_lib_ioctl,
1967         .hw_params =    snd_usb_hw_params,
1968         .hw_free =      snd_usb_hw_free,
1969         .prepare =      snd_usb_pcm_prepare,
1970         .trigger =      snd_usb_pcm_playback_trigger,
1971         .pointer =      snd_usb_pcm_pointer,
1972         .page =         snd_pcm_get_vmalloc_page,
1973 };
1974
1975 static struct snd_pcm_ops snd_usb_capture_ops = {
1976         .open =         snd_usb_capture_open,
1977         .close =        snd_usb_capture_close,
1978         .ioctl =        snd_pcm_lib_ioctl,
1979         .hw_params =    snd_usb_hw_params,
1980         .hw_free =      snd_usb_hw_free,
1981         .prepare =      snd_usb_pcm_prepare,
1982         .trigger =      snd_usb_pcm_capture_trigger,
1983         .pointer =      snd_usb_pcm_pointer,
1984         .page =         snd_pcm_get_vmalloc_page,
1985 };
1986
1987
1988
1989 /*
1990  * helper functions
1991  */
1992
1993 /*
1994  * combine bytes and get an integer value
1995  */
1996 unsigned int snd_usb_combine_bytes(unsigned char *bytes, int size)
1997 {
1998         switch (size) {
1999         case 1:  return *bytes;
2000         case 2:  return combine_word(bytes);
2001         case 3:  return combine_triple(bytes);
2002         case 4:  return combine_quad(bytes);
2003         default: return 0;
2004         }
2005 }
2006
2007 /*
2008  * parse descriptor buffer and return the pointer starting the given
2009  * descriptor type.
2010  */
2011 void *snd_usb_find_desc(void *descstart, int desclen, void *after, u8 dtype)
2012 {
2013         u8 *p, *end, *next;
2014
2015         p = descstart;
2016         end = p + desclen;
2017         for (; p < end;) {
2018                 if (p[0] < 2)
2019                         return NULL;
2020                 next = p + p[0];
2021                 if (next > end)
2022                         return NULL;
2023                 if (p[1] == dtype && (!after || (void *)p > after)) {
2024                         return p;
2025                 }
2026                 p = next;
2027         }
2028         return NULL;
2029 }
2030
2031 /*
2032  * find a class-specified interface descriptor with the given subtype.
2033  */
2034 void *snd_usb_find_csint_desc(void *buffer, int buflen, void *after, u8 dsubtype)
2035 {
2036         unsigned char *p = after;
2037
2038         while ((p = snd_usb_find_desc(buffer, buflen, p,
2039                                       USB_DT_CS_INTERFACE)) != NULL) {
2040                 if (p[0] >= 3 && p[2] == dsubtype)
2041                         return p;
2042         }
2043         return NULL;
2044 }
2045
2046 /*
2047  * Wrapper for usb_control_msg().
2048  * Allocates a temp buffer to prevent dmaing from/to the stack.
2049  */
2050 int snd_usb_ctl_msg(struct usb_device *dev, unsigned int pipe, __u8 request,
2051                     __u8 requesttype, __u16 value, __u16 index, void *data,
2052                     __u16 size, int timeout)
2053 {
2054         int err;
2055         void *buf = NULL;
2056
2057         if (size > 0) {
2058                 buf = kmemdup(data, size, GFP_KERNEL);
2059                 if (!buf)
2060                         return -ENOMEM;
2061         }
2062         err = usb_control_msg(dev, pipe, request, requesttype,
2063                               value, index, buf, size, timeout);
2064         if (size > 0) {
2065                 memcpy(data, buf, size);
2066                 kfree(buf);
2067         }
2068         return err;
2069 }
2070
2071
2072 /*
2073  * entry point for linux usb interface
2074  */
2075
2076 static int usb_audio_probe(struct usb_interface *intf,
2077                            const struct usb_device_id *id);
2078 static void usb_audio_disconnect(struct usb_interface *intf);
2079
2080 #ifdef CONFIG_PM
2081 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message);
2082 static int usb_audio_resume(struct usb_interface *intf);
2083 #else
2084 #define usb_audio_suspend NULL
2085 #define usb_audio_resume NULL
2086 #endif
2087
2088 static struct usb_device_id usb_audio_ids [] = {
2089 #include "usbquirks.h"
2090     { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS),
2091       .bInterfaceClass = USB_CLASS_AUDIO,
2092       .bInterfaceSubClass = USB_SUBCLASS_AUDIO_CONTROL },
2093     { }                                         /* Terminating entry */
2094 };
2095
2096 MODULE_DEVICE_TABLE (usb, usb_audio_ids);
2097
2098 static struct usb_driver usb_audio_driver = {
2099         .name =         "snd-usb-audio",
2100         .probe =        usb_audio_probe,
2101         .disconnect =   usb_audio_disconnect,
2102         .suspend =      usb_audio_suspend,
2103         .resume =       usb_audio_resume,
2104         .id_table =     usb_audio_ids,
2105 };
2106
2107
2108 #if defined(CONFIG_PROC_FS) && defined(CONFIG_SND_VERBOSE_PROCFS)
2109
2110 /*
2111  * proc interface for list the supported pcm formats
2112  */
2113 static void proc_dump_substream_formats(struct snd_usb_substream *subs, struct snd_info_buffer *buffer)
2114 {
2115         struct list_head *p;
2116         static char *sync_types[4] = {
2117                 "NONE", "ASYNC", "ADAPTIVE", "SYNC"
2118         };
2119
2120         list_for_each(p, &subs->fmt_list) {
2121                 struct audioformat *fp;
2122                 fp = list_entry(p, struct audioformat, list);
2123                 snd_iprintf(buffer, "  Interface %d\n", fp->iface);
2124                 snd_iprintf(buffer, "    Altset %d\n", fp->altsetting);
2125                 snd_iprintf(buffer, "    Format: 0x%x\n", fp->format);
2126                 snd_iprintf(buffer, "    Channels: %d\n", fp->channels);
2127                 snd_iprintf(buffer, "    Endpoint: %d %s (%s)\n",
2128                             fp->endpoint & USB_ENDPOINT_NUMBER_MASK,
2129                             fp->endpoint & USB_DIR_IN ? "IN" : "OUT",
2130                             sync_types[(fp->ep_attr & EP_ATTR_MASK) >> 2]);
2131                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS) {
2132                         snd_iprintf(buffer, "    Rates: %d - %d (continuous)\n",
2133                                     fp->rate_min, fp->rate_max);
2134                 } else {
2135                         unsigned int i;
2136                         snd_iprintf(buffer, "    Rates: ");
2137                         for (i = 0; i < fp->nr_rates; i++) {
2138                                 if (i > 0)
2139                                         snd_iprintf(buffer, ", ");
2140                                 snd_iprintf(buffer, "%d", fp->rate_table[i]);
2141                         }
2142                         snd_iprintf(buffer, "\n");
2143                 }
2144                 // snd_iprintf(buffer, "    Max Packet Size = %d\n", fp->maxpacksize);
2145                 // snd_iprintf(buffer, "    EP Attribute = 0x%x\n", fp->attributes);
2146         }
2147 }
2148
2149 static void proc_dump_substream_status(struct snd_usb_substream *subs, struct snd_info_buffer *buffer)
2150 {
2151         if (subs->running) {
2152                 unsigned int i;
2153                 snd_iprintf(buffer, "  Status: Running\n");
2154                 snd_iprintf(buffer, "    Interface = %d\n", subs->interface);
2155                 snd_iprintf(buffer, "    Altset = %d\n", subs->format);
2156                 snd_iprintf(buffer, "    URBs = %d [ ", subs->nurbs);
2157                 for (i = 0; i < subs->nurbs; i++)
2158                         snd_iprintf(buffer, "%d ", subs->dataurb[i].packets);
2159                 snd_iprintf(buffer, "]\n");
2160                 snd_iprintf(buffer, "    Packet Size = %d\n", subs->curpacksize);
2161                 snd_iprintf(buffer, "    Momentary freq = %u Hz (%#x.%04x)\n",
2162                             snd_usb_get_speed(subs->dev) == USB_SPEED_FULL
2163                             ? get_full_speed_hz(subs->freqm)
2164                             : get_high_speed_hz(subs->freqm),
2165                             subs->freqm >> 16, subs->freqm & 0xffff);
2166         } else {
2167                 snd_iprintf(buffer, "  Status: Stop\n");
2168         }
2169 }
2170
2171 static void proc_pcm_format_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
2172 {
2173         struct snd_usb_stream *stream = entry->private_data;
2174
2175         snd_iprintf(buffer, "%s : %s\n", stream->chip->card->longname, stream->pcm->name);
2176
2177         if (stream->substream[SNDRV_PCM_STREAM_PLAYBACK].num_formats) {
2178                 snd_iprintf(buffer, "\nPlayback:\n");
2179                 proc_dump_substream_status(&stream->substream[SNDRV_PCM_STREAM_PLAYBACK], buffer);
2180                 proc_dump_substream_formats(&stream->substream[SNDRV_PCM_STREAM_PLAYBACK], buffer);
2181         }
2182         if (stream->substream[SNDRV_PCM_STREAM_CAPTURE].num_formats) {
2183                 snd_iprintf(buffer, "\nCapture:\n");
2184                 proc_dump_substream_status(&stream->substream[SNDRV_PCM_STREAM_CAPTURE], buffer);
2185                 proc_dump_substream_formats(&stream->substream[SNDRV_PCM_STREAM_CAPTURE], buffer);
2186         }
2187 }
2188
2189 static void proc_pcm_format_add(struct snd_usb_stream *stream)
2190 {
2191         struct snd_info_entry *entry;
2192         char name[32];
2193         struct snd_card *card = stream->chip->card;
2194
2195         sprintf(name, "stream%d", stream->pcm_index);
2196         if (! snd_card_proc_new(card, name, &entry))
2197                 snd_info_set_text_ops(entry, stream, proc_pcm_format_read);
2198 }
2199
2200 #else
2201
2202 static inline void proc_pcm_format_add(struct snd_usb_stream *stream)
2203 {
2204 }
2205
2206 #endif
2207
2208 /*
2209  * initialize the substream instance.
2210  */
2211
2212 static void init_substream(struct snd_usb_stream *as, int stream, struct audioformat *fp)
2213 {
2214         struct snd_usb_substream *subs = &as->substream[stream];
2215
2216         INIT_LIST_HEAD(&subs->fmt_list);
2217         spin_lock_init(&subs->lock);
2218
2219         subs->stream = as;
2220         subs->direction = stream;
2221         subs->dev = as->chip->dev;
2222         if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
2223                 subs->ops = audio_urb_ops[stream];
2224         else
2225                 subs->ops = audio_urb_ops_high_speed[stream];
2226         snd_pcm_set_ops(as->pcm, stream,
2227                         stream == SNDRV_PCM_STREAM_PLAYBACK ?
2228                         &snd_usb_playback_ops : &snd_usb_capture_ops);
2229
2230         list_add_tail(&fp->list, &subs->fmt_list);
2231         subs->formats |= 1ULL << fp->format;
2232         subs->endpoint = fp->endpoint;
2233         subs->num_formats++;
2234         subs->fmt_type = fp->fmt_type;
2235 }
2236
2237
2238 /*
2239  * free a substream
2240  */
2241 static void free_substream(struct snd_usb_substream *subs)
2242 {
2243         struct list_head *p, *n;
2244
2245         if (! subs->num_formats)
2246                 return; /* not initialized */
2247         list_for_each_safe(p, n, &subs->fmt_list) {
2248                 struct audioformat *fp = list_entry(p, struct audioformat, list);
2249                 kfree(fp->rate_table);
2250                 kfree(fp);
2251         }
2252         kfree(subs->rate_list.list);
2253 }
2254
2255
2256 /*
2257  * free a usb stream instance
2258  */
2259 static void snd_usb_audio_stream_free(struct snd_usb_stream *stream)
2260 {
2261         free_substream(&stream->substream[0]);
2262         free_substream(&stream->substream[1]);
2263         list_del(&stream->list);
2264         kfree(stream);
2265 }
2266
2267 static void snd_usb_audio_pcm_free(struct snd_pcm *pcm)
2268 {
2269         struct snd_usb_stream *stream = pcm->private_data;
2270         if (stream) {
2271                 stream->pcm = NULL;
2272                 snd_usb_audio_stream_free(stream);
2273         }
2274 }
2275
2276
2277 /*
2278  * add this endpoint to the chip instance.
2279  * if a stream with the same endpoint already exists, append to it.
2280  * if not, create a new pcm stream.
2281  */
2282 static int add_audio_endpoint(struct snd_usb_audio *chip, int stream, struct audioformat *fp)
2283 {
2284         struct list_head *p;
2285         struct snd_usb_stream *as;
2286         struct snd_usb_substream *subs;
2287         struct snd_pcm *pcm;
2288         int err;
2289
2290         list_for_each(p, &chip->pcm_list) {
2291                 as = list_entry(p, struct snd_usb_stream, list);
2292                 if (as->fmt_type != fp->fmt_type)
2293                         continue;
2294                 subs = &as->substream[stream];
2295                 if (! subs->endpoint)
2296                         continue;
2297                 if (subs->endpoint == fp->endpoint) {
2298                         list_add_tail(&fp->list, &subs->fmt_list);
2299                         subs->num_formats++;
2300                         subs->formats |= 1ULL << fp->format;
2301                         return 0;
2302                 }
2303         }
2304         /* look for an empty stream */
2305         list_for_each(p, &chip->pcm_list) {
2306                 as = list_entry(p, struct snd_usb_stream, list);
2307                 if (as->fmt_type != fp->fmt_type)
2308                         continue;
2309                 subs = &as->substream[stream];
2310                 if (subs->endpoint)
2311                         continue;
2312                 err = snd_pcm_new_stream(as->pcm, stream, 1);
2313                 if (err < 0)
2314                         return err;
2315                 init_substream(as, stream, fp);
2316                 return 0;
2317         }
2318
2319         /* create a new pcm */
2320         as = kzalloc(sizeof(*as), GFP_KERNEL);
2321         if (! as)
2322                 return -ENOMEM;
2323         as->pcm_index = chip->pcm_devs;
2324         as->chip = chip;
2325         as->fmt_type = fp->fmt_type;
2326         err = snd_pcm_new(chip->card, "USB Audio", chip->pcm_devs,
2327                           stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0,
2328                           stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1,
2329                           &pcm);
2330         if (err < 0) {
2331                 kfree(as);
2332                 return err;
2333         }
2334         as->pcm = pcm;
2335         pcm->private_data = as;
2336         pcm->private_free = snd_usb_audio_pcm_free;
2337         pcm->info_flags = 0;
2338         if (chip->pcm_devs > 0)
2339                 sprintf(pcm->name, "USB Audio #%d", chip->pcm_devs);
2340         else
2341                 strcpy(pcm->name, "USB Audio");
2342
2343         init_substream(as, stream, fp);
2344
2345         list_add(&as->list, &chip->pcm_list);
2346         chip->pcm_devs++;
2347
2348         proc_pcm_format_add(as);
2349
2350         return 0;
2351 }
2352
2353
2354 /*
2355  * check if the device uses big-endian samples
2356  */
2357 static int is_big_endian_format(struct snd_usb_audio *chip, struct audioformat *fp)
2358 {
2359         switch (chip->usb_id) {
2360         case USB_ID(0x0763, 0x2001): /* M-Audio Quattro: captured data only */
2361                 if (fp->endpoint & USB_DIR_IN)
2362                         return 1;
2363                 break;
2364         case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
2365                 if (device_setup[chip->index] == 0x00 ||
2366                     fp->altsetting==1 || fp->altsetting==2 || fp->altsetting==3)
2367                         return 1;
2368         }
2369         return 0;
2370 }
2371
2372 /*
2373  * parse the audio format type I descriptor
2374  * and returns the corresponding pcm format
2375  *
2376  * @dev: usb device
2377  * @fp: audioformat record
2378  * @format: the format tag (wFormatTag)
2379  * @fmt: the format type descriptor
2380  */
2381 static int parse_audio_format_i_type(struct snd_usb_audio *chip, struct audioformat *fp,
2382                                      int format, unsigned char *fmt)
2383 {
2384         int pcm_format;
2385         int sample_width, sample_bytes;
2386
2387         /* FIXME: correct endianess and sign? */
2388         pcm_format = -1;
2389         sample_width = fmt[6];
2390         sample_bytes = fmt[5];
2391         switch (format) {
2392         case 0: /* some devices don't define this correctly... */
2393                 snd_printdd(KERN_INFO "%d:%u:%d : format type 0 is detected, processed as PCM\n",
2394                             chip->dev->devnum, fp->iface, fp->altsetting);
2395                 /* fall-through */
2396         case USB_AUDIO_FORMAT_PCM:
2397                 if (sample_width > sample_bytes * 8) {
2398                         snd_printk(KERN_INFO "%d:%u:%d : sample bitwidth %d in over sample bytes %d\n",
2399                                    chip->dev->devnum, fp->iface, fp->altsetting,
2400                                    sample_width, sample_bytes);
2401                 }
2402                 /* check the format byte size */
2403                 switch (fmt[5]) {
2404                 case 1:
2405                         pcm_format = SNDRV_PCM_FORMAT_S8;
2406                         break;
2407                 case 2:
2408                         if (is_big_endian_format(chip, fp))
2409                                 pcm_format = SNDRV_PCM_FORMAT_S16_BE; /* grrr, big endian!! */
2410                         else
2411                                 pcm_format = SNDRV_PCM_FORMAT_S16_LE;
2412                         break;
2413                 case 3:
2414                         if (is_big_endian_format(chip, fp))
2415                                 pcm_format = SNDRV_PCM_FORMAT_S24_3BE; /* grrr, big endian!! */
2416                         else
2417                                 pcm_format = SNDRV_PCM_FORMAT_S24_3LE;
2418                         break;
2419                 case 4:
2420                         pcm_format = SNDRV_PCM_FORMAT_S32_LE;
2421                         break;
2422                 default:
2423                         snd_printk(KERN_INFO "%d:%u:%d : unsupported sample bitwidth %d in %d bytes\n",
2424                                    chip->dev->devnum, fp->iface,
2425                                    fp->altsetting, sample_width, sample_bytes);
2426                         break;
2427                 }
2428                 break;
2429         case USB_AUDIO_FORMAT_PCM8:
2430                 /* Dallas DS4201 workaround */
2431                 if (chip->usb_id == USB_ID(0x04fa, 0x4201))
2432                         pcm_format = SNDRV_PCM_FORMAT_S8;
2433                 else
2434                         pcm_format = SNDRV_PCM_FORMAT_U8;
2435                 break;
2436         case USB_AUDIO_FORMAT_IEEE_FLOAT:
2437                 pcm_format = SNDRV_PCM_FORMAT_FLOAT_LE;
2438                 break;
2439         case USB_AUDIO_FORMAT_ALAW:
2440                 pcm_format = SNDRV_PCM_FORMAT_A_LAW;
2441                 break;
2442         case USB_AUDIO_FORMAT_MU_LAW:
2443                 pcm_format = SNDRV_PCM_FORMAT_MU_LAW;
2444                 break;
2445         default:
2446                 snd_printk(KERN_INFO "%d:%u:%d : unsupported format type %d\n",
2447                            chip->dev->devnum, fp->iface, fp->altsetting, format);
2448                 break;
2449         }
2450         return pcm_format;
2451 }
2452
2453
2454 /*
2455  * parse the format descriptor and stores the possible sample rates
2456  * on the audioformat table.
2457  *
2458  * @dev: usb device
2459  * @fp: audioformat record
2460  * @fmt: the format descriptor
2461  * @offset: the start offset of descriptor pointing the rate type
2462  *          (7 for type I and II, 8 for type II)
2463  */
2464 static int parse_audio_format_rates(struct snd_usb_audio *chip, struct audioformat *fp,
2465                                     unsigned char *fmt, int offset)
2466 {
2467         int nr_rates = fmt[offset];
2468
2469         if (fmt[0] < offset + 1 + 3 * (nr_rates ? nr_rates : 2)) {
2470                 snd_printk(KERN_ERR "%d:%u:%d : invalid FORMAT_TYPE desc\n",
2471                                    chip->dev->devnum, fp->iface, fp->altsetting);
2472                 return -1;
2473         }
2474
2475         if (nr_rates) {
2476                 /*
2477                  * build the rate table and bitmap flags
2478                  */
2479                 int r, idx;
2480                 unsigned int nonzero_rates = 0;
2481
2482                 fp->rate_table = kmalloc(sizeof(int) * nr_rates, GFP_KERNEL);
2483                 if (fp->rate_table == NULL) {
2484                         snd_printk(KERN_ERR "cannot malloc\n");
2485                         return -1;
2486                 }
2487
2488                 fp->nr_rates = nr_rates;
2489                 fp->rate_min = fp->rate_max = combine_triple(&fmt[8]);
2490                 for (r = 0, idx = offset + 1; r < nr_rates; r++, idx += 3) {
2491                         unsigned int rate = combine_triple(&fmt[idx]);
2492                         /* C-Media CM6501 mislabels its 96 kHz altsetting */
2493                         if (rate == 48000 && nr_rates == 1 &&
2494                             chip->usb_id == USB_ID(0x0d8c, 0x0201) &&
2495                             fp->altsetting == 5 && fp->maxpacksize == 392)
2496                                 rate = 96000;
2497                         fp->rate_table[r] = rate;
2498                         nonzero_rates |= rate;
2499                         if (rate < fp->rate_min)
2500                                 fp->rate_min = rate;
2501                         else if (rate > fp->rate_max)
2502                                 fp->rate_max = rate;
2503                         fp->rates |= snd_pcm_rate_to_rate_bit(rate);
2504                 }
2505                 if (!nonzero_rates) {
2506                         hwc_debug("All rates were zero. Skipping format!\n");
2507                         return -1;
2508                 }
2509         } else {
2510                 /* continuous rates */
2511                 fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
2512                 fp->rate_min = combine_triple(&fmt[offset + 1]);
2513                 fp->rate_max = combine_triple(&fmt[offset + 4]);
2514         }
2515         return 0;
2516 }
2517
2518 /*
2519  * parse the format type I and III descriptors
2520  */
2521 static int parse_audio_format_i(struct snd_usb_audio *chip, struct audioformat *fp,
2522                                 int format, unsigned char *fmt)
2523 {
2524         int pcm_format;
2525
2526         if (fmt[3] == USB_FORMAT_TYPE_III) {
2527                 /* FIXME: the format type is really IECxxx
2528                  *        but we give normal PCM format to get the existing
2529                  *        apps working...
2530                  */
2531                 switch (chip->usb_id) {
2532
2533                 case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
2534                         if (device_setup[chip->index] == 0x00 &&
2535                             fp->altsetting == 6)
2536                                 pcm_format = SNDRV_PCM_FORMAT_S16_BE;
2537                         else
2538                                 pcm_format = SNDRV_PCM_FORMAT_S16_LE;
2539                         break;
2540                 default:
2541                         pcm_format = SNDRV_PCM_FORMAT_S16_LE;
2542                 }
2543         } else {
2544                 pcm_format = parse_audio_format_i_type(chip, fp, format, fmt);
2545                 if (pcm_format < 0)
2546                         return -1;
2547         }
2548         fp->format = pcm_format;
2549         fp->channels = fmt[4];
2550         if (fp->channels < 1) {
2551                 snd_printk(KERN_ERR "%d:%u:%d : invalid channels %d\n",
2552                            chip->dev->devnum, fp->iface, fp->altsetting, fp->channels);
2553                 return -1;
2554         }
2555         return parse_audio_format_rates(chip, fp, fmt, 7);
2556 }
2557
2558 /*
2559  * prase the format type II descriptor
2560  */
2561 static int parse_audio_format_ii(struct snd_usb_audio *chip, struct audioformat *fp,
2562                                  int format, unsigned char *fmt)
2563 {
2564         int brate, framesize;
2565         switch (format) {
2566         case USB_AUDIO_FORMAT_AC3:
2567                 /* FIXME: there is no AC3 format defined yet */
2568                 // fp->format = SNDRV_PCM_FORMAT_AC3;
2569                 fp->format = SNDRV_PCM_FORMAT_U8; /* temporarily hack to receive byte streams */
2570                 break;
2571         case USB_AUDIO_FORMAT_MPEG:
2572                 fp->format = SNDRV_PCM_FORMAT_MPEG;
2573                 break;
2574         default:
2575                 snd_printd(KERN_INFO "%d:%u:%d : unknown format tag 0x%x is detected.  processed as MPEG.\n",
2576                            chip->dev->devnum, fp->iface, fp->altsetting, format);
2577                 fp->format = SNDRV_PCM_FORMAT_MPEG;
2578                 break;
2579         }
2580         fp->channels = 1;
2581         brate = combine_word(&fmt[4]);  /* fmt[4,5] : wMaxBitRate (in kbps) */
2582         framesize = combine_word(&fmt[6]); /* fmt[6,7]: wSamplesPerFrame */
2583         snd_printd(KERN_INFO "found format II with max.bitrate = %d, frame size=%d\n", brate, framesize);
2584         fp->frame_size = framesize;
2585         return parse_audio_format_rates(chip, fp, fmt, 8); /* fmt[8..] sample rates */
2586 }
2587
2588 static int parse_audio_format(struct snd_usb_audio *chip, struct audioformat *fp,
2589                               int format, unsigned char *fmt, int stream)
2590 {
2591         int err;
2592
2593         switch (fmt[3]) {
2594         case USB_FORMAT_TYPE_I:
2595         case USB_FORMAT_TYPE_III:
2596                 err = parse_audio_format_i(chip, fp, format, fmt);
2597                 break;
2598         case USB_FORMAT_TYPE_II:
2599                 err = parse_audio_format_ii(chip, fp, format, fmt);
2600                 break;
2601         default:
2602                 snd_printd(KERN_INFO "%d:%u:%d : format type %d is not supported yet\n",
2603                            chip->dev->devnum, fp->iface, fp->altsetting, fmt[3]);
2604                 return -1;
2605         }
2606         fp->fmt_type = fmt[3];
2607         if (err < 0)
2608                 return err;
2609 #if 1
2610         /* FIXME: temporary hack for extigy/audigy 2 nx/zs */
2611         /* extigy apparently supports sample rates other than 48k
2612          * but not in ordinary way.  so we enable only 48k atm.
2613          */
2614         if (chip->usb_id == USB_ID(0x041e, 0x3000) ||
2615             chip->usb_id == USB_ID(0x041e, 0x3020) ||
2616             chip->usb_id == USB_ID(0x041e, 0x3061)) {
2617                 if (fmt[3] == USB_FORMAT_TYPE_I &&
2618                     fp->rates != SNDRV_PCM_RATE_48000 &&
2619                     fp->rates != SNDRV_PCM_RATE_96000)
2620                         return -1;
2621         }
2622 #endif
2623         return 0;
2624 }
2625
2626 static int audiophile_skip_setting_quirk(struct snd_usb_audio *chip,
2627                                          int iface, int altno);
2628 static int parse_audio_endpoints(struct snd_usb_audio *chip, int iface_no)
2629 {
2630         struct usb_device *dev;
2631         struct usb_interface *iface;
2632         struct usb_host_interface *alts;
2633         struct usb_interface_descriptor *altsd;
2634         int i, altno, err, stream;
2635         int format;
2636         struct audioformat *fp;
2637         unsigned char *fmt, *csep;
2638
2639         dev = chip->dev;
2640
2641         /* parse the interface's altsettings */
2642         iface = usb_ifnum_to_if(dev, iface_no);
2643         for (i = 0; i < iface->num_altsetting; i++) {
2644                 alts = &iface->altsetting[i];
2645                 altsd = get_iface_desc(alts);
2646                 /* skip invalid one */
2647                 if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
2648                      altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
2649                     (altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIO_STREAMING &&
2650                      altsd->bInterfaceSubClass != USB_SUBCLASS_VENDOR_SPEC) ||
2651                     altsd->bNumEndpoints < 1 ||
2652                     le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) == 0)
2653                         continue;
2654                 /* must be isochronous */
2655                 if ((get_endpoint(alts, 0)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
2656                     USB_ENDPOINT_XFER_ISOC)
2657                         continue;
2658                 /* check direction */
2659                 stream = (get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN) ?
2660                         SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
2661                 altno = altsd->bAlternateSetting;
2662
2663                 /* audiophile usb: skip altsets incompatible with device_setup
2664                  */
2665                 if (chip->usb_id == USB_ID(0x0763, 0x2003) &&
2666                     audiophile_skip_setting_quirk(chip, iface_no, altno))
2667                         continue;
2668
2669                 /* get audio formats */
2670                 fmt = snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, AS_GENERAL);
2671                 if (!fmt) {
2672                         snd_printk(KERN_ERR "%d:%u:%d : AS_GENERAL descriptor not found\n",
2673                                    dev->devnum, iface_no, altno);
2674                         continue;
2675                 }
2676
2677                 if (fmt[0] < 7) {
2678                         snd_printk(KERN_ERR "%d:%u:%d : invalid AS_GENERAL desc\n",
2679                                    dev->devnum, iface_no, altno);
2680                         continue;
2681                 }
2682
2683                 format = (fmt[6] << 8) | fmt[5]; /* remember the format value */
2684
2685                 /* get format type */
2686                 fmt = snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, FORMAT_TYPE);
2687                 if (!fmt) {
2688                         snd_printk(KERN_ERR "%d:%u:%d : no FORMAT_TYPE desc\n",
2689                                    dev->devnum, iface_no, altno);
2690                         continue;
2691                 }
2692                 if (fmt[0] < 8) {
2693                         snd_printk(KERN_ERR "%d:%u:%d : invalid FORMAT_TYPE desc\n",
2694                                    dev->devnum, iface_no, altno);
2695                         continue;
2696                 }
2697
2698                 csep = snd_usb_find_desc(alts->endpoint[0].extra, alts->endpoint[0].extralen, NULL, USB_DT_CS_ENDPOINT);
2699                 /* Creamware Noah has this descriptor after the 2nd endpoint */
2700                 if (!csep && altsd->bNumEndpoints >= 2)
2701                         csep = snd_usb_find_desc(alts->endpoint[1].extra, alts->endpoint[1].extralen, NULL, USB_DT_CS_ENDPOINT);
2702                 if (!csep || csep[0] < 7 || csep[2] != EP_GENERAL) {
2703                         snd_printk(KERN_WARNING "%d:%u:%d : no or invalid"
2704                                    " class specific endpoint descriptor\n",
2705                                    dev->devnum, iface_no, altno);
2706                         csep = NULL;
2707                 }
2708
2709                 fp = kzalloc(sizeof(*fp), GFP_KERNEL);
2710                 if (! fp) {
2711                         snd_printk(KERN_ERR "cannot malloc\n");
2712                         return -ENOMEM;
2713                 }
2714
2715                 fp->iface = iface_no;
2716                 fp->altsetting = altno;
2717                 fp->altset_idx = i;
2718                 fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
2719                 fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
2720                 fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
2721                 if (snd_usb_get_speed(dev) == USB_SPEED_HIGH)
2722                         fp->maxpacksize = (((fp->maxpacksize >> 11) & 3) + 1)
2723                                         * (fp->maxpacksize & 0x7ff);
2724                 fp->attributes = csep ? csep[3] : 0;
2725
2726                 /* some quirks for attributes here */
2727
2728                 switch (chip->usb_id) {
2729                 case USB_ID(0x0a92, 0x0053): /* AudioTrak Optoplay */
2730                         /* Optoplay sets the sample rate attribute although
2731                          * it seems not supporting it in fact.
2732                          */
2733                         fp->attributes &= ~EP_CS_ATTR_SAMPLE_RATE;
2734                         break;
2735                 case USB_ID(0x041e, 0x3020): /* Creative SB Audigy 2 NX */
2736                 case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
2737                         /* doesn't set the sample rate attribute, but supports it */
2738                         fp->attributes |= EP_CS_ATTR_SAMPLE_RATE;
2739                         break;
2740                 case USB_ID(0x047f, 0x0ca1): /* plantronics headset */
2741                 case USB_ID(0x077d, 0x07af): /* Griffin iMic (note that there is
2742                                                 an older model 77d:223) */
2743                 /*
2744                  * plantronics headset and Griffin iMic have set adaptive-in
2745                  * although it's really not...
2746                  */
2747                         fp->ep_attr &= ~EP_ATTR_MASK;
2748                         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
2749                                 fp->ep_attr |= EP_ATTR_ADAPTIVE;
2750                         else
2751                                 fp->ep_attr |= EP_ATTR_SYNC;
2752                         break;
2753                 }
2754
2755                 /* ok, let's parse further... */
2756                 if (parse_audio_format(chip, fp, format, fmt, stream) < 0) {
2757                         kfree(fp->rate_table);
2758                         kfree(fp);
2759                         continue;
2760                 }
2761
2762                 snd_printdd(KERN_INFO "%d:%u:%d: add audio endpoint 0x%x\n", dev->devnum, iface_no, altno, fp->endpoint);
2763                 err = add_audio_endpoint(chip, stream, fp);
2764                 if (err < 0) {
2765                         kfree(fp->rate_table);
2766                         kfree(fp);
2767                         return err;
2768                 }
2769                 /* try to set the interface... */
2770                 usb_set_interface(chip->dev, iface_no, altno);
2771                 init_usb_pitch(chip->dev, iface_no, alts, fp);
2772                 init_usb_sample_rate(chip->dev, iface_no, alts, fp, fp->rate_max);
2773         }
2774         return 0;
2775 }
2776
2777
2778 /*
2779  * disconnect streams
2780  * called from snd_usb_audio_disconnect()
2781  */
2782 static void snd_usb_stream_disconnect(struct list_head *head)
2783 {
2784         int idx;
2785         struct snd_usb_stream *as;
2786         struct snd_usb_substream *subs;
2787
2788         as = list_entry(head, struct snd_usb_stream, list);
2789         for (idx = 0; idx < 2; idx++) {
2790                 subs = &as->substream[idx];
2791                 if (!subs->num_formats)
2792                         return;
2793                 release_substream_urbs(subs, 1);
2794                 subs->interface = -1;
2795         }
2796 }
2797
2798 /*
2799  * parse audio control descriptor and create pcm/midi streams
2800  */
2801 static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif)
2802 {
2803         struct usb_device *dev = chip->dev;
2804         struct usb_host_interface *host_iface;
2805         struct usb_interface *iface;
2806         unsigned char *p1;
2807         int i, j;
2808
2809         /* find audiocontrol interface */
2810         host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0];
2811         if (!(p1 = snd_usb_find_csint_desc(host_iface->extra, host_iface->extralen, NULL, HEADER))) {
2812                 snd_printk(KERN_ERR "cannot find HEADER\n");
2813                 return -EINVAL;
2814         }
2815         if (! p1[7] || p1[0] < 8 + p1[7]) {
2816                 snd_printk(KERN_ERR "invalid HEADER\n");
2817                 return -EINVAL;
2818         }
2819
2820         /*
2821          * parse all USB audio streaming interfaces
2822          */
2823         for (i = 0; i < p1[7]; i++) {
2824                 struct usb_host_interface *alts;
2825                 struct usb_interface_descriptor *altsd;
2826                 j = p1[8 + i];
2827                 iface = usb_ifnum_to_if(dev, j);
2828                 if (!iface) {
2829                         snd_printk(KERN_ERR "%d:%u:%d : does not exist\n",
2830                                    dev->devnum, ctrlif, j);
2831                         continue;
2832                 }
2833                 if (usb_interface_claimed(iface)) {
2834                         snd_printdd(KERN_INFO "%d:%d:%d: skipping, already claimed\n", dev->devnum, ctrlif, j);
2835                         continue;
2836                 }
2837                 alts = &iface->altsetting[0];
2838                 altsd = get_iface_desc(alts);
2839                 if ((altsd->bInterfaceClass == USB_CLASS_AUDIO ||
2840                      altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) &&
2841                     altsd->bInterfaceSubClass == USB_SUBCLASS_MIDI_STREAMING) {
2842                         if (snd_usb_create_midi_interface(chip, iface, NULL) < 0) {
2843                                 snd_printk(KERN_ERR "%d:%u:%d: cannot create sequencer device\n", dev->devnum, ctrlif, j);
2844                                 continue;
2845                         }
2846                         usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
2847                         continue;
2848                 }
2849                 if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
2850                      altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
2851                     altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIO_STREAMING) {
2852                         snd_printdd(KERN_ERR "%d:%u:%d: skipping non-supported interface %d\n", dev->devnum, ctrlif, j, altsd->bInterfaceClass);
2853                         /* skip non-supported classes */
2854                         continue;
2855                 }
2856                 if (snd_usb_get_speed(dev) == USB_SPEED_LOW) {
2857                         snd_printk(KERN_ERR "low speed audio streaming not supported\n");
2858                         continue;
2859                 }
2860                 if (! parse_audio_endpoints(chip, j)) {
2861                         usb_set_interface(dev, j, 0); /* reset the current interface */
2862                         usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
2863                 }
2864         }
2865
2866         return 0;
2867 }
2868
2869 /*
2870  * create a stream for an endpoint/altsetting without proper descriptors
2871  */
2872 static int create_fixed_stream_quirk(struct snd_usb_audio *chip,
2873                                      struct usb_interface *iface,
2874                                      const struct snd_usb_audio_quirk *quirk)
2875 {
2876         struct audioformat *fp;
2877         struct usb_host_interface *alts;
2878         int stream, err;
2879         unsigned *rate_table = NULL;
2880
2881         fp = kmemdup(quirk->data, sizeof(*fp), GFP_KERNEL);
2882         if (! fp) {
2883                 snd_printk(KERN_ERR "cannot memdup\n");
2884                 return -ENOMEM;
2885         }
2886         if (fp->nr_rates > 0) {
2887                 rate_table = kmalloc(sizeof(int) * fp->nr_rates, GFP_KERNEL);
2888                 if (!rate_table) {
2889                         kfree(fp);
2890                         return -ENOMEM;
2891                 }
2892                 memcpy(rate_table, fp->rate_table, sizeof(int) * fp->nr_rates);
2893                 fp->rate_table = rate_table;
2894         }
2895
2896         stream = (fp->endpoint & USB_DIR_IN)
2897                 ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
2898         err = add_audio_endpoint(chip, stream, fp);
2899         if (err < 0) {
2900                 kfree(fp);
2901                 kfree(rate_table);
2902                 return err;
2903         }
2904         if (fp->iface != get_iface_desc(&iface->altsetting[0])->bInterfaceNumber ||
2905             fp->altset_idx >= iface->num_altsetting) {
2906                 kfree(fp);
2907                 kfree(rate_table);
2908                 return -EINVAL;
2909         }
2910         alts = &iface->altsetting[fp->altset_idx];
2911         usb_set_interface(chip->dev, fp->iface, 0);
2912         init_usb_pitch(chip->dev, fp->iface, alts, fp);
2913         init_usb_sample_rate(chip->dev, fp->iface, alts, fp, fp->rate_max);
2914         return 0;
2915 }
2916
2917 /*
2918  * create a stream for an interface with proper descriptors
2919  */
2920 static int create_standard_audio_quirk(struct snd_usb_audio *chip,
2921                                        struct usb_interface *iface,
2922                                        const struct snd_usb_audio_quirk *quirk)
2923 {
2924         struct usb_host_interface *alts;
2925         struct usb_interface_descriptor *altsd;
2926         int err;
2927
2928         alts = &iface->altsetting[0];
2929         altsd = get_iface_desc(alts);
2930         err = parse_audio_endpoints(chip, altsd->bInterfaceNumber);
2931         if (err < 0) {
2932                 snd_printk(KERN_ERR "cannot setup if %d: error %d\n",
2933                            altsd->bInterfaceNumber, err);
2934                 return err;
2935         }
2936         /* reset the current interface */
2937         usb_set_interface(chip->dev, altsd->bInterfaceNumber, 0);
2938         return 0;
2939 }
2940
2941 /*
2942  * Create a stream for an Edirol UA-700/UA-25 interface.  The only way
2943  * to detect the sample rate is by looking at wMaxPacketSize.
2944  */
2945 static int create_ua700_ua25_quirk(struct snd_usb_audio *chip,
2946                                    struct usb_interface *iface,
2947                                    const struct snd_usb_audio_quirk *quirk)
2948 {
2949         static const struct audioformat ua_format = {
2950                 .format = SNDRV_PCM_FORMAT_S24_3LE,
2951                 .channels = 2,
2952                 .fmt_type = USB_FORMAT_TYPE_I,
2953                 .altsetting = 1,
2954                 .altset_idx = 1,
2955                 .rates = SNDRV_PCM_RATE_CONTINUOUS,
2956         };
2957         struct usb_host_interface *alts;
2958         struct usb_interface_descriptor *altsd;
2959         struct audioformat *fp;
2960         int stream, err;
2961
2962         /* both PCM and MIDI interfaces have 2 altsettings */
2963         if (iface->num_altsetting != 2)
2964                 return -ENXIO;
2965         alts = &iface->altsetting[1];
2966         altsd = get_iface_desc(alts);
2967
2968         if (altsd->bNumEndpoints == 2) {
2969                 static const struct snd_usb_midi_endpoint_info ua700_ep = {
2970                         .out_cables = 0x0003,
2971                         .in_cables  = 0x0003
2972                 };
2973                 static const struct snd_usb_audio_quirk ua700_quirk = {
2974                         .type = QUIRK_MIDI_FIXED_ENDPOINT,
2975                         .data = &ua700_ep
2976                 };
2977                 static const struct snd_usb_midi_endpoint_info ua25_ep = {
2978                         .out_cables = 0x0001,
2979                         .in_cables  = 0x0001
2980                 };
2981                 static const struct snd_usb_audio_quirk ua25_quirk = {
2982                         .type = QUIRK_MIDI_FIXED_ENDPOINT,
2983                         .data = &ua25_ep
2984                 };
2985                 if (chip->usb_id == USB_ID(0x0582, 0x002b))
2986                         return snd_usb_create_midi_interface(chip, iface,
2987                                                              &ua700_quirk);
2988                 else
2989                         return snd_usb_create_midi_interface(chip, iface,
2990                                                              &ua25_quirk);
2991         }
2992
2993         if (altsd->bNumEndpoints != 1)
2994                 return -ENXIO;
2995
2996         fp = kmalloc(sizeof(*fp), GFP_KERNEL);
2997         if (!fp)
2998                 return -ENOMEM;
2999         memcpy(fp, &ua_format, sizeof(*fp));
3000
3001         fp->iface = altsd->bInterfaceNumber;
3002         fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
3003         fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
3004         fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
3005
3006         switch (fp->maxpacksize) {
3007         case 0x120:
3008                 fp->rate_max = fp->rate_min = 44100;
3009                 break;
3010         case 0x138:
3011         case 0x140:
3012                 fp->rate_max = fp->rate_min = 48000;
3013                 break;
3014         case 0x258:
3015         case 0x260:
3016                 fp->rate_max = fp->rate_min = 96000;
3017                 break;
3018         default:
3019                 snd_printk(KERN_ERR "unknown sample rate\n");
3020                 kfree(fp);
3021                 return -ENXIO;
3022         }
3023
3024         stream = (fp->endpoint & USB_DIR_IN)
3025                 ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
3026         err = add_audio_endpoint(chip, stream, fp);
3027         if (err < 0) {
3028                 kfree(fp);
3029                 return err;
3030         }
3031         usb_set_interface(chip->dev, fp->iface, 0);
3032         return 0;
3033 }
3034
3035 /*
3036  * Create a stream for an Edirol UA-1000 interface.
3037  */
3038 static int create_ua1000_quirk(struct snd_usb_audio *chip,
3039                                struct usb_interface *iface,
3040                                const struct snd_usb_audio_quirk *quirk)
3041 {
3042         static const struct audioformat ua1000_format = {
3043                 .format = SNDRV_PCM_FORMAT_S32_LE,
3044                 .fmt_type = USB_FORMAT_TYPE_I,
3045                 .altsetting = 1,
3046                 .altset_idx = 1,
3047                 .attributes = 0,
3048                 .rates = SNDRV_PCM_RATE_CONTINUOUS,
3049         };
3050         struct usb_host_interface *alts;
3051         struct usb_interface_descriptor *altsd;
3052         struct audioformat *fp;
3053         int stream, err;
3054
3055         if (iface->num_altsetting != 2)
3056                 return -ENXIO;
3057         alts = &iface->altsetting[1];
3058         altsd = get_iface_desc(alts);
3059         if (alts->extralen != 11 || alts->extra[1] != USB_DT_CS_INTERFACE ||
3060             altsd->bNumEndpoints != 1)
3061                 return -ENXIO;
3062
3063         fp = kmemdup(&ua1000_format, sizeof(*fp), GFP_KERNEL);
3064         if (!fp)
3065                 return -ENOMEM;
3066
3067         fp->channels = alts->extra[4];
3068         fp->iface = altsd->bInterfaceNumber;
3069         fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
3070         fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
3071         fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
3072         fp->rate_max = fp->rate_min = combine_triple(&alts->extra[8]);
3073
3074         stream = (fp->endpoint & USB_DIR_IN)
3075                 ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
3076         err = add_audio_endpoint(chip, stream, fp);
3077         if (err < 0) {
3078                 kfree(fp);
3079                 return err;
3080         }
3081         /* FIXME: playback must be synchronized to capture */
3082         usb_set_interface(chip->dev, fp->iface, 0);
3083         return 0;
3084 }
3085
3086 /*
3087  * Create a stream for an Edirol UA-101 interface.
3088  * Copy, paste and modify from Edirol UA-1000
3089  */
3090 static int create_ua101_quirk(struct snd_usb_audio *chip,
3091                                struct usb_interface *iface,
3092                                const struct snd_usb_audio_quirk *quirk)
3093 {
3094         static const struct audioformat ua101_format = {
3095                 .format = SNDRV_PCM_FORMAT_S32_LE,
3096                 .fmt_type = USB_FORMAT_TYPE_I,
3097                 .altsetting = 1,
3098                 .altset_idx = 1,
3099                 .attributes = 0,
3100                 .rates = SNDRV_PCM_RATE_CONTINUOUS,
3101         };
3102         struct usb_host_interface *alts;
3103         struct usb_interface_descriptor *altsd;
3104         struct audioformat *fp;
3105         int stream, err;
3106
3107         if (iface->num_altsetting != 2)
3108                 return -ENXIO;
3109         alts = &iface->altsetting[1];
3110         altsd = get_iface_desc(alts);
3111         if (alts->extralen != 18 || alts->extra[1] != USB_DT_CS_INTERFACE ||
3112             altsd->bNumEndpoints != 1)
3113                 return -ENXIO;
3114
3115         fp = kmemdup(&ua101_format, sizeof(*fp), GFP_KERNEL);
3116         if (!fp)
3117                 return -ENOMEM;
3118
3119         fp->channels = alts->extra[11];
3120         fp->iface = altsd->bInterfaceNumber;
3121         fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
3122         fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
3123         fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
3124         fp->rate_max = fp->rate_min = combine_triple(&alts->extra[15]);
3125
3126         stream = (fp->endpoint & USB_DIR_IN)
3127                 ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
3128         err = add_audio_endpoint(chip, stream, fp);
3129         if (err < 0) {
3130                 kfree(fp);
3131                 return err;
3132         }
3133         /* FIXME: playback must be synchronized to capture */
3134         usb_set_interface(chip->dev, fp->iface, 0);
3135         return 0;
3136 }
3137
3138 static int snd_usb_create_quirk(struct snd_usb_audio *chip,
3139                                 struct usb_interface *iface,
3140                                 const struct snd_usb_audio_quirk *quirk);
3141
3142 /*
3143  * handle the quirks for the contained interfaces
3144  */
3145 static int create_composite_quirk(struct snd_usb_audio *chip,
3146                                   struct usb_interface *iface,
3147                                   const struct snd_usb_audio_quirk *quirk)
3148 {
3149         int probed_ifnum = get_iface_desc(iface->altsetting)->bInterfaceNumber;
3150         int err;
3151
3152         for (quirk = quirk->data; quirk->ifnum >= 0; ++quirk) {
3153                 iface = usb_ifnum_to_if(chip->dev, quirk->ifnum);
3154                 if (!iface)
3155                         continue;
3156                 if (quirk->ifnum != probed_ifnum &&
3157                     usb_interface_claimed(iface))
3158                         continue;
3159                 err = snd_usb_create_quirk(chip, iface, quirk);
3160                 if (err < 0)
3161                         return err;
3162                 if (quirk->ifnum != probed_ifnum)
3163                         usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
3164         }
3165         return 0;
3166 }
3167
3168 static int ignore_interface_quirk(struct snd_usb_audio *chip,
3169                                   struct usb_interface *iface,
3170                                   const struct snd_usb_audio_quirk *quirk)
3171 {
3172         return 0;
3173 }
3174
3175
3176 /*
3177  * boot quirks
3178  */
3179
3180 #define EXTIGY_FIRMWARE_SIZE_OLD 794
3181 #define EXTIGY_FIRMWARE_SIZE_NEW 483
3182
3183 static int snd_usb_extigy_boot_quirk(struct usb_device *dev, struct usb_interface *intf)
3184 {
3185         struct usb_host_config *config = dev->actconfig;
3186         int err;
3187
3188         if (le16_to_cpu(get_cfg_desc(config)->wTotalLength) == EXTIGY_FIRMWARE_SIZE_OLD ||
3189             le16_to_cpu(get_cfg_desc(config)->wTotalLength) == EXTIGY_FIRMWARE_SIZE_NEW) {
3190                 snd_printdd("sending Extigy boot sequence...\n");
3191                 /* Send message to force it to reconnect with full interface. */
3192                 err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev,0),
3193                                       0x10, 0x43, 0x0001, 0x000a, NULL, 0, 1000);
3194                 if (err < 0) snd_printdd("error sending boot message: %d\n", err);
3195                 err = usb_get_descriptor(dev, USB_DT_DEVICE, 0,
3196                                 &dev->descriptor, sizeof(dev->descriptor));
3197                 config = dev->actconfig;
3198                 if (err < 0) snd_printdd("error usb_get_descriptor: %d\n", err);
3199                 err = usb_reset_configuration(dev);
3200                 if (err < 0) snd_printdd("error usb_reset_configuration: %d\n", err);
3201                 snd_printdd("extigy_boot: new boot length = %d\n",
3202                             le16_to_cpu(get_cfg_desc(config)->wTotalLength));
3203                 return -ENODEV; /* quit this anyway */
3204         }
3205         return 0;
3206 }
3207
3208 static int snd_usb_audigy2nx_boot_quirk(struct usb_device *dev)
3209 {
3210         u8 buf = 1;
3211
3212         snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), 0x2a,
3213                         USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER,
3214                         0, 0, &buf, 1, 1000);
3215         if (buf == 0) {
3216                 snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), 0x29,
3217                                 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_OTHER,
3218                                 1, 2000, NULL, 0, 1000);
3219                 return -ENODEV;
3220         }
3221         return 0;
3222 }
3223
3224 /*
3225  * C-Media CM106/CM106+ have four 16-bit internal registers that are nicely
3226  * documented in the device's data sheet.
3227  */
3228 static int snd_usb_cm106_write_int_reg(struct usb_device *dev, int reg, u16 value)
3229 {
3230         u8 buf[4];
3231         buf[0] = 0x20;
3232         buf[1] = value & 0xff;
3233         buf[2] = (value >> 8) & 0xff;
3234         buf[3] = reg;
3235         return snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), USB_REQ_SET_CONFIGURATION,
3236                                USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT,
3237                                0, 0, &buf, 4, 1000);
3238 }
3239
3240 static int snd_usb_cm106_boot_quirk(struct usb_device *dev)
3241 {
3242         /*
3243          * Enable line-out driver mode, set headphone source to front
3244          * channels, enable stereo mic.
3245          */
3246         return snd_usb_cm106_write_int_reg(dev, 2, 0x8004);
3247 }
3248
3249
3250 /*
3251  * Setup quirks
3252  */
3253 #define AUDIOPHILE_SET                  0x01 /* if set, parse device_setup */
3254 #define AUDIOPHILE_SET_DTS              0x02 /* if set, enable DTS Digital Output */
3255 #define AUDIOPHILE_SET_96K              0x04 /* 48-96KHz rate if set, 8-48KHz otherwise */
3256 #define AUDIOPHILE_SET_24B              0x08 /* 24bits sample if set, 16bits otherwise */
3257 #define AUDIOPHILE_SET_DI               0x10 /* if set, enable Digital Input */
3258 #define AUDIOPHILE_SET_MASK             0x1F /* bit mask for setup value */
3259 #define AUDIOPHILE_SET_24B_48K_DI       0x19 /* value for 24bits+48KHz+Digital Input */
3260 #define AUDIOPHILE_SET_24B_48K_NOTDI    0x09 /* value for 24bits+48KHz+No Digital Input */
3261 #define AUDIOPHILE_SET_16B_48K_DI       0x11 /* value for 16bits+48KHz+Digital Input */
3262 #define AUDIOPHILE_SET_16B_48K_NOTDI    0x01 /* value for 16bits+48KHz+No Digital Input */
3263
3264 static int audiophile_skip_setting_quirk(struct snd_usb_audio *chip,
3265                                          int iface, int altno)
3266 {
3267         /* Reset ALL ifaces to 0 altsetting.
3268          * Call it for every possible altsetting of every interface.
3269          */
3270         usb_set_interface(chip->dev, iface, 0);
3271
3272         if (device_setup[chip->index] & AUDIOPHILE_SET) {
3273                 if ((device_setup[chip->index] & AUDIOPHILE_SET_DTS)
3274                     && altno != 6)
3275                         return 1; /* skip this altsetting */
3276                 if ((device_setup[chip->index] & AUDIOPHILE_SET_96K)
3277                     && altno != 1)
3278                         return 1; /* skip this altsetting */
3279                 if ((device_setup[chip->index] & AUDIOPHILE_SET_MASK) ==
3280                     AUDIOPHILE_SET_24B_48K_DI && altno != 2)
3281                         return 1; /* skip this altsetting */
3282                 if ((device_setup[chip->index] & AUDIOPHILE_SET_MASK) ==
3283                     AUDIOPHILE_SET_24B_48K_NOTDI && altno != 3)
3284                         return 1; /* skip this altsetting */
3285                 if ((device_setup[chip->index] & AUDIOPHILE_SET_MASK) ==
3286                     AUDIOPHILE_SET_16B_48K_DI && altno != 4)
3287                         return 1; /* skip this altsetting */
3288                 if ((device_setup[chip->index] & AUDIOPHILE_SET_MASK) ==
3289                     AUDIOPHILE_SET_16B_48K_NOTDI && altno != 5)
3290                         return 1; /* skip this altsetting */
3291         }
3292         return 0; /* keep this altsetting */
3293 }
3294
3295 /*
3296  * audio-interface quirks
3297  *
3298  * returns zero if no standard audio/MIDI parsing is needed.
3299  * returns a postive value if standard audio/midi interfaces are parsed
3300  * after this.
3301  * returns a negative value at error.
3302  */
3303 static int snd_usb_create_quirk(struct snd_usb_audio *chip,
3304                                 struct usb_interface *iface,
3305                                 const struct snd_usb_audio_quirk *quirk)
3306 {
3307         typedef int (*quirk_func_t)(struct snd_usb_audio *, struct usb_interface *,
3308                                     const struct snd_usb_audio_quirk *);
3309         static const quirk_func_t quirk_funcs[] = {
3310                 [QUIRK_IGNORE_INTERFACE] = ignore_interface_quirk,
3311                 [QUIRK_COMPOSITE] = create_composite_quirk,
3312                 [QUIRK_MIDI_STANDARD_INTERFACE] = snd_usb_create_midi_interface,
3313                 [QUIRK_MIDI_FIXED_ENDPOINT] = snd_usb_create_midi_interface,
3314                 [QUIRK_MIDI_YAMAHA] = snd_usb_create_midi_interface,
3315                 [QUIRK_MIDI_MIDIMAN] = snd_usb_create_midi_interface,
3316                 [QUIRK_MIDI_NOVATION] = snd_usb_create_midi_interface,
3317                 [QUIRK_MIDI_RAW] = snd_usb_create_midi_interface,
3318                 [QUIRK_MIDI_EMAGIC] = snd_usb_create_midi_interface,
3319                 [QUIRK_MIDI_CME] = snd_usb_create_midi_interface,
3320                 [QUIRK_AUDIO_STANDARD_INTERFACE] = create_standard_audio_quirk,
3321                 [QUIRK_AUDIO_FIXED_ENDPOINT] = create_fixed_stream_quirk,
3322                 [QUIRK_AUDIO_EDIROL_UA700_UA25] = create_ua700_ua25_quirk,
3323                 [QUIRK_AUDIO_EDIROL_UA1000] = create_ua1000_quirk,
3324                 [QUIRK_AUDIO_EDIROL_UA101] = create_ua101_quirk,
3325         };
3326
3327         if (quirk->type < QUIRK_TYPE_COUNT) {
3328                 return quirk_funcs[quirk->type](chip, iface, quirk);
3329         } else {
3330                 snd_printd(KERN_ERR "invalid quirk type %d\n", quirk->type);
3331                 return -ENXIO;
3332         }
3333 }
3334
3335
3336 /*
3337  * common proc files to show the usb device info
3338  */
3339 static void proc_audio_usbbus_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
3340 {
3341         struct snd_usb_audio *chip = entry->private_data;
3342         if (! chip->shutdown)
3343                 snd_iprintf(buffer, "%03d/%03d\n", chip->dev->bus->busnum, chip->dev->devnum);
3344 }
3345
3346 static void proc_audio_usbid_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
3347 {
3348         struct snd_usb_audio *chip = entry->private_data;
3349         if (! chip->shutdown)
3350                 snd_iprintf(buffer, "%04x:%04x\n",
3351                             USB_ID_VENDOR(chip->usb_id),
3352                             USB_ID_PRODUCT(chip->usb_id));
3353 }
3354
3355 static void snd_usb_audio_create_proc(struct snd_usb_audio *chip)
3356 {
3357         struct snd_info_entry *entry;
3358         if (! snd_card_proc_new(chip->card, "usbbus", &entry))
3359                 snd_info_set_text_ops(entry, chip, proc_audio_usbbus_read);
3360         if (! snd_card_proc_new(chip->card, "usbid", &entry))
3361                 snd_info_set_text_ops(entry, chip, proc_audio_usbid_read);
3362 }
3363
3364 /*
3365  * free the chip instance
3366  *
3367  * here we have to do not much, since pcm and controls are already freed
3368  *
3369  */
3370
3371 static int snd_usb_audio_free(struct snd_usb_audio *chip)
3372 {
3373         usb_chip[chip->index] = NULL;
3374         kfree(chip);
3375         return 0;
3376 }
3377
3378 static int snd_usb_audio_dev_free(struct snd_device *device)
3379 {
3380         struct snd_usb_audio *chip = device->device_data;
3381         return snd_usb_audio_free(chip);
3382 }
3383
3384
3385 /*
3386  * create a chip instance and set its names.
3387  */
3388 static int snd_usb_audio_create(struct usb_device *dev, int idx,
3389                                 const struct snd_usb_audio_quirk *quirk,
3390                                 struct snd_usb_audio **rchip)
3391 {
3392         struct snd_card *card;
3393         struct snd_usb_audio *chip;
3394         int err, len;
3395         char component[14];
3396         static struct snd_device_ops ops = {
3397                 .dev_free =     snd_usb_audio_dev_free,
3398         };
3399
3400         *rchip = NULL;
3401
3402         if (snd_usb_get_speed(dev) != USB_SPEED_LOW &&
3403             snd_usb_get_speed(dev) != USB_SPEED_FULL &&
3404             snd_usb_get_speed(dev) != USB_SPEED_HIGH) {
3405                 snd_printk(KERN_ERR "unknown device speed %d\n", snd_usb_get_speed(dev));
3406                 return -ENXIO;
3407         }
3408
3409         card = snd_card_new(index[idx], id[idx], THIS_MODULE, 0);
3410         if (card == NULL) {
3411                 snd_printk(KERN_ERR "cannot create card instance %d\n", idx);
3412                 return -ENOMEM;
3413         }
3414
3415         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
3416         if (! chip) {
3417                 snd_card_free(card);
3418                 return -ENOMEM;
3419         }
3420
3421         chip->index = idx;
3422         chip->dev = dev;
3423         chip->card = card;
3424         chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
3425                               le16_to_cpu(dev->descriptor.idProduct));
3426         INIT_LIST_HEAD(&chip->pcm_list);
3427         INIT_LIST_HEAD(&chip->midi_list);
3428         INIT_LIST_HEAD(&chip->mixer_list);
3429
3430         if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
3431                 snd_usb_audio_free(chip);
3432                 snd_card_free(card);
3433                 return err;
3434         }
3435
3436         strcpy(card->driver, "USB-Audio");
3437         sprintf(component, "USB%04x:%04x",
3438                 USB_ID_VENDOR(chip->usb_id), USB_ID_PRODUCT(chip->usb_id));
3439         snd_component_add(card, component);
3440
3441         /* retrieve the device string as shortname */
3442         if (quirk && quirk->product_name) {
3443                 strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname));
3444         } else {
3445                 if (!dev->descriptor.iProduct ||
3446                     usb_string(dev, dev->descriptor.iProduct,
3447                                card->shortname, sizeof(card->shortname)) <= 0) {
3448                         /* no name available from anywhere, so use ID */
3449                         sprintf(card->shortname, "USB Device %#04x:%#04x",
3450                                 USB_ID_VENDOR(chip->usb_id),
3451                                 USB_ID_PRODUCT(chip->usb_id));
3452                 }
3453         }
3454
3455         /* retrieve the vendor and device strings as longname */
3456         if (quirk && quirk->vendor_name) {
3457                 len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname));
3458         } else {
3459                 if (dev->descriptor.iManufacturer)
3460                         len = usb_string(dev, dev->descriptor.iManufacturer,
3461                                          card->longname, sizeof(card->longname));
3462                 else
3463                         len = 0;
3464                 /* we don't really care if there isn't any vendor string */
3465         }
3466         if (len > 0)
3467                 strlcat(card->longname, " ", sizeof(card->longname));
3468
3469         strlcat(card->longname, card->shortname, sizeof(card->longname));
3470
3471         len = strlcat(card->longname, " at ", sizeof(card->longname));
3472
3473         if (len < sizeof(card->longname))
3474                 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len);
3475
3476         strlcat(card->longname,
3477                 snd_usb_get_speed(dev) == USB_SPEED_LOW ? ", low speed" :
3478                 snd_usb_get_speed(dev) == USB_SPEED_FULL ? ", full speed" :
3479                 ", high speed",
3480                 sizeof(card->longname));
3481
3482         snd_usb_audio_create_proc(chip);
3483
3484         *rchip = chip;
3485         return 0;
3486 }
3487
3488
3489 /*
3490  * probe the active usb device
3491  *
3492  * note that this can be called multiple times per a device, when it
3493  * includes multiple audio control interfaces.
3494  *
3495  * thus we check the usb device pointer and creates the card instance
3496  * only at the first time.  the successive calls of this function will
3497  * append the pcm interface to the corresponding card.
3498  */
3499 static void *snd_usb_audio_probe(struct usb_device *dev,
3500                                  struct usb_interface *intf,
3501                                  const struct usb_device_id *usb_id)
3502 {
3503         const struct snd_usb_audio_quirk *quirk = (const struct snd_usb_audio_quirk *)usb_id->driver_info;
3504         int i, err;
3505         struct snd_usb_audio *chip;
3506         struct usb_host_interface *alts;
3507         int ifnum;
3508         u32 id;
3509
3510         alts = &intf->altsetting[0];
3511         ifnum = get_iface_desc(alts)->bInterfaceNumber;
3512         id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
3513                     le16_to_cpu(dev->descriptor.idProduct));
3514
3515         if (quirk && quirk->ifnum >= 0 && ifnum != quirk->ifnum)
3516                 goto __err_val;
3517
3518         /* SB Extigy needs special boot-up sequence */
3519         /* if more models come, this will go to the quirk list. */
3520         if (id == USB_ID(0x041e, 0x3000)) {
3521                 if (snd_usb_extigy_boot_quirk(dev, intf) < 0)
3522                         goto __err_val;
3523         }
3524         /* SB Audigy 2 NX needs its own boot-up magic, too */
3525         if (id == USB_ID(0x041e, 0x3020)) {
3526                 if (snd_usb_audigy2nx_boot_quirk(dev) < 0)
3527                         goto __err_val;
3528         }
3529
3530         /* C-Media CM106 / Turtle Beach Audio Advantage Roadie */
3531         if (id == USB_ID(0x10f5, 0x0200)) {
3532                 if (snd_usb_cm106_boot_quirk(dev) < 0)
3533                         goto __err_val;
3534         }
3535
3536         /*
3537          * found a config.  now register to ALSA
3538          */
3539
3540         /* check whether it's already registered */
3541         chip = NULL;
3542         mutex_lock(&register_mutex);
3543         for (i = 0; i < SNDRV_CARDS; i++) {
3544                 if (usb_chip[i] && usb_chip[i]->dev == dev) {
3545                         if (usb_chip[i]->shutdown) {
3546                                 snd_printk(KERN_ERR "USB device is in the shutdown state, cannot create a card instance\n");
3547                                 goto __error;
3548                         }
3549                         chip = usb_chip[i];
3550                         break;
3551                 }
3552         }
3553         if (! chip) {
3554                 /* it's a fresh one.
3555                  * now look for an empty slot and create a new card instance
3556                  */
3557                 for (i = 0; i < SNDRV_CARDS; i++)
3558                         if (enable[i] && ! usb_chip[i] &&
3559                             (vid[i] == -1 || vid[i] == USB_ID_VENDOR(id)) &&
3560                             (pid[i] == -1 || pid[i] == USB_ID_PRODUCT(id))) {
3561                                 if (snd_usb_audio_create(dev, i, quirk, &chip) < 0) {
3562                                         goto __error;
3563                                 }
3564                                 snd_card_set_dev(chip->card, &intf->dev);
3565                                 break;
3566                         }
3567                 if (! chip) {
3568                         snd_printk(KERN_ERR "no available usb audio device\n");
3569                         goto __error;
3570                 }
3571         }
3572
3573         err = 1; /* continue */
3574         if (quirk && quirk->ifnum != QUIRK_NO_INTERFACE) {
3575                 /* need some special handlings */
3576                 if ((err = snd_usb_create_quirk(chip, intf, quirk)) < 0)
3577                         goto __error;
3578         }
3579
3580         if (err > 0) {
3581                 /* create normal USB audio interfaces */
3582                 if (snd_usb_create_streams(chip, ifnum) < 0 ||
3583                     snd_usb_create_mixer(chip, ifnum) < 0) {
3584                         goto __error;
3585                 }
3586         }
3587
3588         /* we are allowed to call snd_card_register() many times */
3589         if (snd_card_register(chip->card) < 0) {
3590                 goto __error;
3591         }
3592
3593         usb_chip[chip->index] = chip;
3594         chip->num_interfaces++;
3595         mutex_unlock(&register_mutex);
3596         return chip;
3597
3598  __error:
3599         if (chip && !chip->num_interfaces)
3600                 snd_card_free(chip->card);
3601         mutex_unlock(&register_mutex);
3602  __err_val:
3603         return NULL;
3604 }
3605
3606 /*
3607  * we need to take care of counter, since disconnection can be called also
3608  * many times as well as usb_audio_probe().
3609  */
3610 static void snd_usb_audio_disconnect(struct usb_device *dev, void *ptr)
3611 {
3612         struct snd_usb_audio *chip;
3613         struct snd_card *card;
3614         struct list_head *p;
3615
3616         if (ptr == (void *)-1L)
3617                 return;
3618
3619         chip = ptr;
3620         card = chip->card;
3621         mutex_lock(&register_mutex);
3622         chip->shutdown = 1;
3623         chip->num_interfaces--;
3624         if (chip->num_interfaces <= 0) {
3625                 snd_card_disconnect(card);
3626                 /* release the pcm resources */
3627                 list_for_each(p, &chip->pcm_list) {
3628                         snd_usb_stream_disconnect(p);
3629                 }
3630                 /* release the midi resources */
3631                 list_for_each(p, &chip->midi_list) {
3632                         snd_usbmidi_disconnect(p);
3633                 }
3634                 /* release mixer resources */
3635                 list_for_each(p, &chip->mixer_list) {
3636                         snd_usb_mixer_disconnect(p);
3637                 }
3638                 mutex_unlock(&register_mutex);
3639                 snd_card_free_when_closed(card);
3640         } else {
3641                 mutex_unlock(&register_mutex);
3642         }
3643 }
3644
3645 /*
3646  * new 2.5 USB kernel API
3647  */
3648 static int usb_audio_probe(struct usb_interface *intf,
3649                            const struct usb_device_id *id)
3650 {
3651         void *chip;
3652         chip = snd_usb_audio_probe(interface_to_usbdev(intf), intf, id);
3653         if (chip) {
3654                 dev_set_drvdata(&intf->dev, chip);
3655                 return 0;
3656         } else
3657                 return -EIO;
3658 }
3659
3660 static void usb_audio_disconnect(struct usb_interface *intf)
3661 {
3662         snd_usb_audio_disconnect(interface_to_usbdev(intf),
3663                                  dev_get_drvdata(&intf->dev));
3664 }
3665
3666 #ifdef CONFIG_PM
3667 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
3668 {
3669         struct snd_usb_audio *chip = dev_get_drvdata(&intf->dev);
3670         struct list_head *p;
3671         struct snd_usb_stream *as;
3672
3673         if (chip == (void *)-1L)
3674                 return 0;
3675
3676         snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
3677         if (!chip->num_suspended_intf++) {
3678                 list_for_each(p, &chip->pcm_list) {
3679                         as = list_entry(p, struct snd_usb_stream, list);
3680                         snd_pcm_suspend_all(as->pcm);
3681                 }
3682         }
3683
3684         return 0;
3685 }
3686
3687 static int usb_audio_resume(struct usb_interface *intf)
3688 {
3689         struct snd_usb_audio *chip = dev_get_drvdata(&intf->dev);
3690
3691         if (chip == (void *)-1L)
3692                 return 0;
3693         if (--chip->num_suspended_intf)
3694                 return 0;
3695         /*
3696          * ALSA leaves material resumption to user space
3697          * we just notify
3698          */
3699
3700         snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
3701
3702         return 0;
3703 }
3704 #endif          /* CONFIG_PM */
3705
3706 static int __init snd_usb_audio_init(void)
3707 {
3708         if (nrpacks < MIN_PACKS_URB || nrpacks > MAX_PACKS) {
3709                 printk(KERN_WARNING "invalid nrpacks value.\n");
3710                 return -EINVAL;
3711         }
3712         return usb_register(&usb_audio_driver);
3713 }
3714
3715
3716 static void __exit snd_usb_audio_cleanup(void)
3717 {
3718         usb_deregister(&usb_audio_driver);
3719 }
3720
3721 module_init(snd_usb_audio_init);
3722 module_exit(snd_usb_audio_cleanup);