offb: use framebuffer_alloc() to allocate fb_info struct
[sfrench/cifs-2.6.git] / 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 /* Vendor/product IDs for this card */
69 static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
70 static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
71 static int nrpacks = 8;         /* max. number of packets per urb */
72 static int async_unlink = 1;
73 static int device_setup[SNDRV_CARDS]; /* device parameter for this card*/
74 static int ignore_ctl_error;
75
76 module_param_array(index, int, NULL, 0444);
77 MODULE_PARM_DESC(index, "Index value for the USB audio adapter.");
78 module_param_array(id, charp, NULL, 0444);
79 MODULE_PARM_DESC(id, "ID string for the USB audio adapter.");
80 module_param_array(enable, bool, NULL, 0444);
81 MODULE_PARM_DESC(enable, "Enable USB audio adapter.");
82 module_param_array(vid, int, NULL, 0444);
83 MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device.");
84 module_param_array(pid, int, NULL, 0444);
85 MODULE_PARM_DESC(pid, "Product ID for the USB audio device.");
86 module_param(nrpacks, int, 0644);
87 MODULE_PARM_DESC(nrpacks, "Max. number of packets per URB.");
88 module_param(async_unlink, bool, 0444);
89 MODULE_PARM_DESC(async_unlink, "Use async unlink mode.");
90 module_param_array(device_setup, int, NULL, 0444);
91 MODULE_PARM_DESC(device_setup, "Specific device setup (if needed).");
92 module_param(ignore_ctl_error, bool, 0444);
93 MODULE_PARM_DESC(ignore_ctl_error,
94                  "Ignore errors from USB controller for mixer interfaces.");
95
96 /*
97  * debug the h/w constraints
98  */
99 /* #define HW_CONST_DEBUG */
100
101
102 /*
103  *
104  */
105
106 #define MAX_PACKS       20
107 #define MAX_PACKS_HS    (MAX_PACKS * 8) /* in high speed mode */
108 #define MAX_URBS        8
109 #define SYNC_URBS       4       /* always four urbs for sync */
110 #define MAX_QUEUE       24      /* try not to exceed this queue length, in ms */
111
112 struct audioformat {
113         struct list_head list;
114         snd_pcm_format_t format;        /* format type */
115         unsigned int channels;          /* # channels */
116         unsigned int fmt_type;          /* USB audio format type (1-3) */
117         unsigned int frame_size;        /* samples per frame for non-audio */
118         int iface;                      /* interface number */
119         unsigned char altsetting;       /* corresponding alternate setting */
120         unsigned char altset_idx;       /* array index of altenate setting */
121         unsigned char attributes;       /* corresponding attributes of cs endpoint */
122         unsigned char endpoint;         /* endpoint */
123         unsigned char ep_attr;          /* endpoint attributes */
124         unsigned char datainterval;     /* log_2 of data packet interval */
125         unsigned int maxpacksize;       /* max. packet size */
126         unsigned int rates;             /* rate bitmasks */
127         unsigned int rate_min, rate_max;        /* min/max rates */
128         unsigned int nr_rates;          /* number of rate table entries */
129         unsigned int *rate_table;       /* rate table */
130 };
131
132 struct snd_usb_substream;
133
134 struct snd_urb_ctx {
135         struct urb *urb;
136         unsigned int buffer_size;       /* size of data buffer, if data URB */
137         struct snd_usb_substream *subs;
138         int index;      /* index for urb array */
139         int packets;    /* number of packets per urb */
140 };
141
142 struct snd_urb_ops {
143         int (*prepare)(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime, struct urb *u);
144         int (*retire)(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime, struct urb *u);
145         int (*prepare_sync)(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime, struct urb *u);
146         int (*retire_sync)(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime, struct urb *u);
147 };
148
149 struct snd_usb_substream {
150         struct snd_usb_stream *stream;
151         struct usb_device *dev;
152         struct snd_pcm_substream *pcm_substream;
153         int direction;  /* playback or capture */
154         int interface;  /* current interface */
155         int endpoint;   /* assigned endpoint */
156         struct audioformat *cur_audiofmt;       /* current audioformat pointer (for hw_params callback) */
157         unsigned int cur_rate;          /* current rate (for hw_params callback) */
158         unsigned int period_bytes;      /* current period bytes (for hw_params callback) */
159         unsigned int format;     /* USB data format */
160         unsigned int datapipe;   /* the data i/o pipe */
161         unsigned int syncpipe;   /* 1 - async out or adaptive in */
162         unsigned int datainterval;      /* log_2 of data packet interval */
163         unsigned int syncinterval;  /* P for adaptive mode, 0 otherwise */
164         unsigned int freqn;      /* nominal sampling rate in fs/fps in Q16.16 format */
165         unsigned int freqm;      /* momentary sampling rate in fs/fps in Q16.16 format */
166         unsigned int freqmax;    /* maximum sampling rate, used for buffer management */
167         unsigned int phase;      /* phase accumulator */
168         unsigned int maxpacksize;       /* max packet size in bytes */
169         unsigned int maxframesize;      /* max packet size in frames */
170         unsigned int curpacksize;       /* current packet size in bytes (for capture) */
171         unsigned int curframesize;      /* current packet size in frames (for capture) */
172         unsigned int fill_max: 1;       /* fill max packet size always */
173         unsigned int fmt_type;          /* USB audio format type (1-3) */
174
175         unsigned int running: 1;        /* running status */
176
177         unsigned int hwptr_done;                        /* processed frame position in the buffer */
178         unsigned int transfer_done;             /* processed frames since last period update */
179         unsigned long active_mask;      /* bitmask of active urbs */
180         unsigned long unlink_mask;      /* bitmask of unlinked urbs */
181
182         unsigned int nurbs;                     /* # urbs */
183         struct snd_urb_ctx dataurb[MAX_URBS];   /* data urb table */
184         struct snd_urb_ctx syncurb[SYNC_URBS];  /* sync urb table */
185         char *syncbuf;                          /* sync buffer for all sync URBs */
186         dma_addr_t sync_dma;                    /* DMA address of syncbuf */
187
188         u64 formats;                    /* format bitmasks (all or'ed) */
189         unsigned int num_formats;               /* number of supported audio formats (list) */
190         struct list_head fmt_list;      /* format list */
191         struct snd_pcm_hw_constraint_list rate_list;    /* limited rates */
192         spinlock_t lock;
193
194         struct snd_urb_ops ops;         /* callbacks (must be filled at init) */
195 };
196
197
198 struct snd_usb_stream {
199         struct snd_usb_audio *chip;
200         struct snd_pcm *pcm;
201         int pcm_index;
202         unsigned int fmt_type;          /* USB audio format type (1-3) */
203         struct snd_usb_substream substream[2];
204         struct list_head list;
205 };
206
207
208 /*
209  * we keep the snd_usb_audio_t instances by ourselves for merging
210  * the all interfaces on the same card as one sound device.
211  */
212
213 static DEFINE_MUTEX(register_mutex);
214 static struct snd_usb_audio *usb_chip[SNDRV_CARDS];
215
216
217 /*
218  * convert a sampling rate into our full speed format (fs/1000 in Q16.16)
219  * this will overflow at approx 524 kHz
220  */
221 static inline unsigned get_usb_full_speed_rate(unsigned int rate)
222 {
223         return ((rate << 13) + 62) / 125;
224 }
225
226 /*
227  * convert a sampling rate into USB high speed format (fs/8000 in Q16.16)
228  * this will overflow at approx 4 MHz
229  */
230 static inline unsigned get_usb_high_speed_rate(unsigned int rate)
231 {
232         return ((rate << 10) + 62) / 125;
233 }
234
235 /* convert our full speed USB rate into sampling rate in Hz */
236 static inline unsigned get_full_speed_hz(unsigned int usb_rate)
237 {
238         return (usb_rate * 125 + (1 << 12)) >> 13;
239 }
240
241 /* convert our high speed USB rate into sampling rate in Hz */
242 static inline unsigned get_high_speed_hz(unsigned int usb_rate)
243 {
244         return (usb_rate * 125 + (1 << 9)) >> 10;
245 }
246
247
248 /*
249  * prepare urb for full speed capture sync pipe
250  *
251  * fill the length and offset of each urb descriptor.
252  * the fixed 10.14 frequency is passed through the pipe.
253  */
254 static int prepare_capture_sync_urb(struct snd_usb_substream *subs,
255                                     struct snd_pcm_runtime *runtime,
256                                     struct urb *urb)
257 {
258         unsigned char *cp = urb->transfer_buffer;
259         struct snd_urb_ctx *ctx = urb->context;
260
261         urb->dev = ctx->subs->dev; /* we need to set this at each time */
262         urb->iso_frame_desc[0].length = 3;
263         urb->iso_frame_desc[0].offset = 0;
264         cp[0] = subs->freqn >> 2;
265         cp[1] = subs->freqn >> 10;
266         cp[2] = subs->freqn >> 18;
267         return 0;
268 }
269
270 /*
271  * prepare urb for high speed capture sync pipe
272  *
273  * fill the length and offset of each urb descriptor.
274  * the fixed 12.13 frequency is passed as 16.16 through the pipe.
275  */
276 static int prepare_capture_sync_urb_hs(struct snd_usb_substream *subs,
277                                        struct snd_pcm_runtime *runtime,
278                                        struct urb *urb)
279 {
280         unsigned char *cp = urb->transfer_buffer;
281         struct snd_urb_ctx *ctx = urb->context;
282
283         urb->dev = ctx->subs->dev; /* we need to set this at each time */
284         urb->iso_frame_desc[0].length = 4;
285         urb->iso_frame_desc[0].offset = 0;
286         cp[0] = subs->freqn;
287         cp[1] = subs->freqn >> 8;
288         cp[2] = subs->freqn >> 16;
289         cp[3] = subs->freqn >> 24;
290         return 0;
291 }
292
293 /*
294  * process after capture sync complete
295  * - nothing to do
296  */
297 static int retire_capture_sync_urb(struct snd_usb_substream *subs,
298                                    struct snd_pcm_runtime *runtime,
299                                    struct urb *urb)
300 {
301         return 0;
302 }
303
304 /*
305  * prepare urb for capture data pipe
306  *
307  * fill the offset and length of each descriptor.
308  *
309  * we use a temporary buffer to write the captured data.
310  * since the length of written data is determined by host, we cannot
311  * write onto the pcm buffer directly...  the data is thus copied
312  * later at complete callback to the global buffer.
313  */
314 static int prepare_capture_urb(struct snd_usb_substream *subs,
315                                struct snd_pcm_runtime *runtime,
316                                struct urb *urb)
317 {
318         int i, offs;
319         struct snd_urb_ctx *ctx = urb->context;
320
321         offs = 0;
322         urb->dev = ctx->subs->dev; /* we need to set this at each time */
323         for (i = 0; i < ctx->packets; i++) {
324                 urb->iso_frame_desc[i].offset = offs;
325                 urb->iso_frame_desc[i].length = subs->curpacksize;
326                 offs += subs->curpacksize;
327         }
328         urb->transfer_buffer_length = offs;
329         urb->number_of_packets = ctx->packets;
330         return 0;
331 }
332
333 /*
334  * process after capture complete
335  *
336  * copy the data from each desctiptor to the pcm buffer, and
337  * update the current position.
338  */
339 static int retire_capture_urb(struct snd_usb_substream *subs,
340                               struct snd_pcm_runtime *runtime,
341                               struct urb *urb)
342 {
343         unsigned long flags;
344         unsigned char *cp;
345         int i;
346         unsigned int stride, len, oldptr;
347         int period_elapsed = 0;
348
349         stride = runtime->frame_bits >> 3;
350
351         for (i = 0; i < urb->number_of_packets; i++) {
352                 cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
353                 if (urb->iso_frame_desc[i].status) {
354                         snd_printd(KERN_ERR "frame %d active: %d\n", i, urb->iso_frame_desc[i].status);
355                         // continue;
356                 }
357                 len = urb->iso_frame_desc[i].actual_length / stride;
358                 if (! len)
359                         continue;
360                 /* update the current pointer */
361                 spin_lock_irqsave(&subs->lock, flags);
362                 oldptr = subs->hwptr_done;
363                 subs->hwptr_done += len;
364                 if (subs->hwptr_done >= runtime->buffer_size)
365                         subs->hwptr_done -= runtime->buffer_size;
366                 subs->transfer_done += len;
367                 if (subs->transfer_done >= runtime->period_size) {
368                         subs->transfer_done -= runtime->period_size;
369                         period_elapsed = 1;
370                 }
371                 spin_unlock_irqrestore(&subs->lock, flags);
372                 /* copy a data chunk */
373                 if (oldptr + len > runtime->buffer_size) {
374                         unsigned int cnt = runtime->buffer_size - oldptr;
375                         unsigned int blen = cnt * stride;
376                         memcpy(runtime->dma_area + oldptr * stride, cp, blen);
377                         memcpy(runtime->dma_area, cp + blen, len * stride - blen);
378                 } else {
379                         memcpy(runtime->dma_area + oldptr * stride, cp, len * stride);
380                 }
381         }
382         if (period_elapsed)
383                 snd_pcm_period_elapsed(subs->pcm_substream);
384         return 0;
385 }
386
387 /*
388  * Process after capture complete when paused.  Nothing to do.
389  */
390 static int retire_paused_capture_urb(struct snd_usb_substream *subs,
391                                      struct snd_pcm_runtime *runtime,
392                                      struct urb *urb)
393 {
394         return 0;
395 }
396
397
398 /*
399  * prepare urb for full speed playback sync pipe
400  *
401  * set up the offset and length to receive the current frequency.
402  */
403
404 static int prepare_playback_sync_urb(struct snd_usb_substream *subs,
405                                      struct snd_pcm_runtime *runtime,
406                                      struct urb *urb)
407 {
408         struct snd_urb_ctx *ctx = urb->context;
409
410         urb->dev = ctx->subs->dev; /* we need to set this at each time */
411         urb->iso_frame_desc[0].length = 3;
412         urb->iso_frame_desc[0].offset = 0;
413         return 0;
414 }
415
416 /*
417  * prepare urb for high speed playback sync pipe
418  *
419  * set up the offset and length to receive the current frequency.
420  */
421
422 static int prepare_playback_sync_urb_hs(struct snd_usb_substream *subs,
423                                         struct snd_pcm_runtime *runtime,
424                                         struct urb *urb)
425 {
426         struct snd_urb_ctx *ctx = urb->context;
427
428         urb->dev = ctx->subs->dev; /* we need to set this at each time */
429         urb->iso_frame_desc[0].length = 4;
430         urb->iso_frame_desc[0].offset = 0;
431         return 0;
432 }
433
434 /*
435  * process after full speed playback sync complete
436  *
437  * retrieve the current 10.14 frequency from pipe, and set it.
438  * the value is referred in prepare_playback_urb().
439  */
440 static int retire_playback_sync_urb(struct snd_usb_substream *subs,
441                                     struct snd_pcm_runtime *runtime,
442                                     struct urb *urb)
443 {
444         unsigned int f;
445         unsigned long flags;
446
447         if (urb->iso_frame_desc[0].status == 0 &&
448             urb->iso_frame_desc[0].actual_length == 3) {
449                 f = combine_triple((u8*)urb->transfer_buffer) << 2;
450                 if (f >= subs->freqn - subs->freqn / 8 && f <= subs->freqmax) {
451                         spin_lock_irqsave(&subs->lock, flags);
452                         subs->freqm = f;
453                         spin_unlock_irqrestore(&subs->lock, flags);
454                 }
455         }
456
457         return 0;
458 }
459
460 /*
461  * process after high speed playback sync complete
462  *
463  * retrieve the current 12.13 frequency from pipe, and set it.
464  * the value is referred in prepare_playback_urb().
465  */
466 static int retire_playback_sync_urb_hs(struct snd_usb_substream *subs,
467                                        struct snd_pcm_runtime *runtime,
468                                        struct urb *urb)
469 {
470         unsigned int f;
471         unsigned long flags;
472
473         if (urb->iso_frame_desc[0].status == 0 &&
474             urb->iso_frame_desc[0].actual_length == 4) {
475                 f = combine_quad((u8*)urb->transfer_buffer) & 0x0fffffff;
476                 if (f >= subs->freqn - subs->freqn / 8 && f <= subs->freqmax) {
477                         spin_lock_irqsave(&subs->lock, flags);
478                         subs->freqm = f;
479                         spin_unlock_irqrestore(&subs->lock, flags);
480                 }
481         }
482
483         return 0;
484 }
485
486 /*
487  * process after E-Mu 0202/0404/Tracker Pre high speed playback sync complete
488  *
489  * These devices return the number of samples per packet instead of the number
490  * of samples per microframe.
491  */
492 static int retire_playback_sync_urb_hs_emu(struct snd_usb_substream *subs,
493                                            struct snd_pcm_runtime *runtime,
494                                            struct urb *urb)
495 {
496         unsigned int f;
497         unsigned long flags;
498
499         if (urb->iso_frame_desc[0].status == 0 &&
500             urb->iso_frame_desc[0].actual_length == 4) {
501                 f = combine_quad((u8*)urb->transfer_buffer) & 0x0fffffff;
502                 f >>= subs->datainterval;
503                 if (f >= subs->freqn - subs->freqn / 8 && f <= subs->freqmax) {
504                         spin_lock_irqsave(&subs->lock, flags);
505                         subs->freqm = f;
506                         spin_unlock_irqrestore(&subs->lock, flags);
507                 }
508         }
509
510         return 0;
511 }
512
513 /* determine the number of frames in the next packet */
514 static int snd_usb_audio_next_packet_size(struct snd_usb_substream *subs)
515 {
516         if (subs->fill_max)
517                 return subs->maxframesize;
518         else {
519                 subs->phase = (subs->phase & 0xffff)
520                         + (subs->freqm << subs->datainterval);
521                 return min(subs->phase >> 16, subs->maxframesize);
522         }
523 }
524
525 /*
526  * Prepare urb for streaming before playback starts or when paused.
527  *
528  * We don't have any data, so we send silence.
529  */
530 static int prepare_nodata_playback_urb(struct snd_usb_substream *subs,
531                                        struct snd_pcm_runtime *runtime,
532                                        struct urb *urb)
533 {
534         unsigned int i, offs, counts;
535         struct snd_urb_ctx *ctx = urb->context;
536         int stride = runtime->frame_bits >> 3;
537
538         offs = 0;
539         urb->dev = ctx->subs->dev;
540         for (i = 0; i < ctx->packets; ++i) {
541                 counts = snd_usb_audio_next_packet_size(subs);
542                 urb->iso_frame_desc[i].offset = offs * stride;
543                 urb->iso_frame_desc[i].length = counts * stride;
544                 offs += counts;
545         }
546         urb->number_of_packets = ctx->packets;
547         urb->transfer_buffer_length = offs * stride;
548         memset(urb->transfer_buffer,
549                subs->cur_audiofmt->format == SNDRV_PCM_FORMAT_U8 ? 0x80 : 0,
550                offs * stride);
551         return 0;
552 }
553
554 /*
555  * prepare urb for playback data pipe
556  *
557  * Since a URB can handle only a single linear buffer, we must use double
558  * buffering when the data to be transferred overflows the buffer boundary.
559  * To avoid inconsistencies when updating hwptr_done, we use double buffering
560  * for all URBs.
561  */
562 static int prepare_playback_urb(struct snd_usb_substream *subs,
563                                 struct snd_pcm_runtime *runtime,
564                                 struct urb *urb)
565 {
566         int i, stride, offs;
567         unsigned int counts;
568         unsigned long flags;
569         int period_elapsed = 0;
570         struct snd_urb_ctx *ctx = urb->context;
571
572         stride = runtime->frame_bits >> 3;
573
574         offs = 0;
575         urb->dev = ctx->subs->dev; /* we need to set this at each time */
576         urb->number_of_packets = 0;
577         spin_lock_irqsave(&subs->lock, flags);
578         for (i = 0; i < ctx->packets; i++) {
579                 counts = snd_usb_audio_next_packet_size(subs);
580                 /* set up descriptor */
581                 urb->iso_frame_desc[i].offset = offs * stride;
582                 urb->iso_frame_desc[i].length = counts * stride;
583                 offs += counts;
584                 urb->number_of_packets++;
585                 subs->transfer_done += counts;
586                 if (subs->transfer_done >= runtime->period_size) {
587                         subs->transfer_done -= runtime->period_size;
588                         period_elapsed = 1;
589                         if (subs->fmt_type == USB_FORMAT_TYPE_II) {
590                                 if (subs->transfer_done > 0) {
591                                         /* FIXME: fill-max mode is not
592                                          * supported yet */
593                                         offs -= subs->transfer_done;
594                                         counts -= subs->transfer_done;
595                                         urb->iso_frame_desc[i].length =
596                                                 counts * stride;
597                                         subs->transfer_done = 0;
598                                 }
599                                 i++;
600                                 if (i < ctx->packets) {
601                                         /* add a transfer delimiter */
602                                         urb->iso_frame_desc[i].offset =
603                                                 offs * stride;
604                                         urb->iso_frame_desc[i].length = 0;
605                                         urb->number_of_packets++;
606                                 }
607                                 break;
608                         }
609                 }
610                 if (period_elapsed) /* finish at the period boundary */
611                         break;
612         }
613         if (subs->hwptr_done + offs > runtime->buffer_size) {
614                 /* err, the transferred area goes over buffer boundary. */
615                 unsigned int len = runtime->buffer_size - subs->hwptr_done;
616                 memcpy(urb->transfer_buffer,
617                        runtime->dma_area + subs->hwptr_done * stride,
618                        len * stride);
619                 memcpy(urb->transfer_buffer + len * stride,
620                        runtime->dma_area,
621                        (offs - len) * stride);
622         } else {
623                 memcpy(urb->transfer_buffer,
624                        runtime->dma_area + subs->hwptr_done * stride,
625                        offs * stride);
626         }
627         subs->hwptr_done += offs;
628         if (subs->hwptr_done >= runtime->buffer_size)
629                 subs->hwptr_done -= runtime->buffer_size;
630         runtime->delay += offs;
631         spin_unlock_irqrestore(&subs->lock, flags);
632         urb->transfer_buffer_length = offs * stride;
633         if (period_elapsed)
634                 snd_pcm_period_elapsed(subs->pcm_substream);
635         return 0;
636 }
637
638 /*
639  * process after playback data complete
640  * - decrease the delay count again
641  */
642 static int retire_playback_urb(struct snd_usb_substream *subs,
643                                struct snd_pcm_runtime *runtime,
644                                struct urb *urb)
645 {
646         unsigned long flags;
647         int stride = runtime->frame_bits >> 3;
648         int processed = urb->transfer_buffer_length / stride;
649
650         spin_lock_irqsave(&subs->lock, flags);
651         if (processed > runtime->delay)
652                 runtime->delay = 0;
653         else
654                 runtime->delay -= processed;
655         spin_unlock_irqrestore(&subs->lock, flags);
656         return 0;
657 }
658
659
660 /*
661  */
662 static struct snd_urb_ops audio_urb_ops[2] = {
663         {
664                 .prepare =      prepare_nodata_playback_urb,
665                 .retire =       retire_playback_urb,
666                 .prepare_sync = prepare_playback_sync_urb,
667                 .retire_sync =  retire_playback_sync_urb,
668         },
669         {
670                 .prepare =      prepare_capture_urb,
671                 .retire =       retire_capture_urb,
672                 .prepare_sync = prepare_capture_sync_urb,
673                 .retire_sync =  retire_capture_sync_urb,
674         },
675 };
676
677 static struct snd_urb_ops audio_urb_ops_high_speed[2] = {
678         {
679                 .prepare =      prepare_nodata_playback_urb,
680                 .retire =       retire_playback_urb,
681                 .prepare_sync = prepare_playback_sync_urb_hs,
682                 .retire_sync =  retire_playback_sync_urb_hs,
683         },
684         {
685                 .prepare =      prepare_capture_urb,
686                 .retire =       retire_capture_urb,
687                 .prepare_sync = prepare_capture_sync_urb_hs,
688                 .retire_sync =  retire_capture_sync_urb,
689         },
690 };
691
692 /*
693  * complete callback from data urb
694  */
695 static void snd_complete_urb(struct urb *urb)
696 {
697         struct snd_urb_ctx *ctx = urb->context;
698         struct snd_usb_substream *subs = ctx->subs;
699         struct snd_pcm_substream *substream = ctx->subs->pcm_substream;
700         int err = 0;
701
702         if ((subs->running && subs->ops.retire(subs, substream->runtime, urb)) ||
703             !subs->running || /* can be stopped during retire callback */
704             (err = subs->ops.prepare(subs, substream->runtime, urb)) < 0 ||
705             (err = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
706                 clear_bit(ctx->index, &subs->active_mask);
707                 if (err < 0) {
708                         snd_printd(KERN_ERR "cannot submit urb (err = %d)\n", err);
709                         snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
710                 }
711         }
712 }
713
714
715 /*
716  * complete callback from sync urb
717  */
718 static void snd_complete_sync_urb(struct urb *urb)
719 {
720         struct snd_urb_ctx *ctx = urb->context;
721         struct snd_usb_substream *subs = ctx->subs;
722         struct snd_pcm_substream *substream = ctx->subs->pcm_substream;
723         int err = 0;
724
725         if ((subs->running && subs->ops.retire_sync(subs, substream->runtime, urb)) ||
726             !subs->running || /* can be stopped during retire callback */
727             (err = subs->ops.prepare_sync(subs, substream->runtime, urb)) < 0 ||
728             (err = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
729                 clear_bit(ctx->index + 16, &subs->active_mask);
730                 if (err < 0) {
731                         snd_printd(KERN_ERR "cannot submit sync urb (err = %d)\n", err);
732                         snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
733                 }
734         }
735 }
736
737
738 /* get the physical page pointer at the given offset */
739 static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
740                                              unsigned long offset)
741 {
742         void *pageptr = subs->runtime->dma_area + offset;
743         return vmalloc_to_page(pageptr);
744 }
745
746 /* allocate virtual buffer; may be called more than once */
747 static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs, size_t size)
748 {
749         struct snd_pcm_runtime *runtime = subs->runtime;
750         if (runtime->dma_area) {
751                 if (runtime->dma_bytes >= size)
752                         return 0; /* already large enough */
753                 vfree(runtime->dma_area);
754         }
755         runtime->dma_area = vmalloc(size);
756         if (!runtime->dma_area)
757                 return -ENOMEM;
758         runtime->dma_bytes = size;
759         return 0;
760 }
761
762 /* free virtual buffer; may be called more than once */
763 static int snd_pcm_free_vmalloc_buffer(struct snd_pcm_substream *subs)
764 {
765         struct snd_pcm_runtime *runtime = subs->runtime;
766
767         vfree(runtime->dma_area);
768         runtime->dma_area = NULL;
769         return 0;
770 }
771
772
773 /*
774  * unlink active urbs.
775  */
776 static int deactivate_urbs(struct snd_usb_substream *subs, int force, int can_sleep)
777 {
778         unsigned int i;
779         int async;
780
781         subs->running = 0;
782
783         if (!force && subs->stream->chip->shutdown) /* to be sure... */
784                 return -EBADFD;
785
786         async = !can_sleep && async_unlink;
787
788         if (!async && in_interrupt())
789                 return 0;
790
791         for (i = 0; i < subs->nurbs; i++) {
792                 if (test_bit(i, &subs->active_mask)) {
793                         if (!test_and_set_bit(i, &subs->unlink_mask)) {
794                                 struct urb *u = subs->dataurb[i].urb;
795                                 if (async)
796                                         usb_unlink_urb(u);
797                                 else
798                                         usb_kill_urb(u);
799                         }
800                 }
801         }
802         if (subs->syncpipe) {
803                 for (i = 0; i < SYNC_URBS; i++) {
804                         if (test_bit(i+16, &subs->active_mask)) {
805                                 if (!test_and_set_bit(i+16, &subs->unlink_mask)) {
806                                         struct urb *u = subs->syncurb[i].urb;
807                                         if (async)
808                                                 usb_unlink_urb(u);
809                                         else
810                                                 usb_kill_urb(u);
811                                 }
812                         }
813                 }
814         }
815         return 0;
816 }
817
818
819 static const char *usb_error_string(int err)
820 {
821         switch (err) {
822         case -ENODEV:
823                 return "no device";
824         case -ENOENT:
825                 return "endpoint not enabled";
826         case -EPIPE:
827                 return "endpoint stalled";
828         case -ENOSPC:
829                 return "not enough bandwidth";
830         case -ESHUTDOWN:
831                 return "device disabled";
832         case -EHOSTUNREACH:
833                 return "device suspended";
834         case -EINVAL:
835         case -EAGAIN:
836         case -EFBIG:
837         case -EMSGSIZE:
838                 return "internal error";
839         default:
840                 return "unknown error";
841         }
842 }
843
844 /*
845  * set up and start data/sync urbs
846  */
847 static int start_urbs(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime)
848 {
849         unsigned int i;
850         int err;
851
852         if (subs->stream->chip->shutdown)
853                 return -EBADFD;
854
855         for (i = 0; i < subs->nurbs; i++) {
856                 if (snd_BUG_ON(!subs->dataurb[i].urb))
857                         return -EINVAL;
858                 if (subs->ops.prepare(subs, runtime, subs->dataurb[i].urb) < 0) {
859                         snd_printk(KERN_ERR "cannot prepare datapipe for urb %d\n", i);
860                         goto __error;
861                 }
862         }
863         if (subs->syncpipe) {
864                 for (i = 0; i < SYNC_URBS; i++) {
865                         if (snd_BUG_ON(!subs->syncurb[i].urb))
866                                 return -EINVAL;
867                         if (subs->ops.prepare_sync(subs, runtime, subs->syncurb[i].urb) < 0) {
868                                 snd_printk(KERN_ERR "cannot prepare syncpipe for urb %d\n", i);
869                                 goto __error;
870                         }
871                 }
872         }
873
874         subs->active_mask = 0;
875         subs->unlink_mask = 0;
876         subs->running = 1;
877         for (i = 0; i < subs->nurbs; i++) {
878                 err = usb_submit_urb(subs->dataurb[i].urb, GFP_ATOMIC);
879                 if (err < 0) {
880                         snd_printk(KERN_ERR "cannot submit datapipe "
881                                    "for urb %d, error %d: %s\n",
882                                    i, err, usb_error_string(err));
883                         goto __error;
884                 }
885                 set_bit(i, &subs->active_mask);
886         }
887         if (subs->syncpipe) {
888                 for (i = 0; i < SYNC_URBS; i++) {
889                         err = usb_submit_urb(subs->syncurb[i].urb, GFP_ATOMIC);
890                         if (err < 0) {
891                                 snd_printk(KERN_ERR "cannot submit syncpipe "
892                                            "for urb %d, error %d: %s\n",
893                                            i, err, usb_error_string(err));
894                                 goto __error;
895                         }
896                         set_bit(i + 16, &subs->active_mask);
897                 }
898         }
899         return 0;
900
901  __error:
902         // snd_pcm_stop(subs->pcm_substream, SNDRV_PCM_STATE_XRUN);
903         deactivate_urbs(subs, 0, 0);
904         return -EPIPE;
905 }
906
907
908 /*
909  *  wait until all urbs are processed.
910  */
911 static int wait_clear_urbs(struct snd_usb_substream *subs)
912 {
913         unsigned long end_time = jiffies + msecs_to_jiffies(1000);
914         unsigned int i;
915         int alive;
916
917         do {
918                 alive = 0;
919                 for (i = 0; i < subs->nurbs; i++) {
920                         if (test_bit(i, &subs->active_mask))
921                                 alive++;
922                 }
923                 if (subs->syncpipe) {
924                         for (i = 0; i < SYNC_URBS; i++) {
925                                 if (test_bit(i + 16, &subs->active_mask))
926                                         alive++;
927                         }
928                 }
929                 if (! alive)
930                         break;
931                 schedule_timeout_uninterruptible(1);
932         } while (time_before(jiffies, end_time));
933         if (alive)
934                 snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive);
935         return 0;
936 }
937
938
939 /*
940  * return the current pcm pointer.  just return the hwptr_done value.
941  */
942 static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
943 {
944         struct snd_usb_substream *subs;
945         snd_pcm_uframes_t hwptr_done;
946         
947         subs = (struct snd_usb_substream *)substream->runtime->private_data;
948         spin_lock(&subs->lock);
949         hwptr_done = subs->hwptr_done;
950         spin_unlock(&subs->lock);
951         return hwptr_done;
952 }
953
954
955 /*
956  * start/stop playback substream
957  */
958 static int snd_usb_pcm_playback_trigger(struct snd_pcm_substream *substream,
959                                         int cmd)
960 {
961         struct snd_usb_substream *subs = substream->runtime->private_data;
962
963         switch (cmd) {
964         case SNDRV_PCM_TRIGGER_START:
965         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
966                 subs->ops.prepare = prepare_playback_urb;
967                 return 0;
968         case SNDRV_PCM_TRIGGER_STOP:
969                 return deactivate_urbs(subs, 0, 0);
970         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
971                 subs->ops.prepare = prepare_nodata_playback_urb;
972                 return 0;
973         default:
974                 return -EINVAL;
975         }
976 }
977
978 /*
979  * start/stop capture substream
980  */
981 static int snd_usb_pcm_capture_trigger(struct snd_pcm_substream *substream,
982                                        int cmd)
983 {
984         struct snd_usb_substream *subs = substream->runtime->private_data;
985
986         switch (cmd) {
987         case SNDRV_PCM_TRIGGER_START:
988                 subs->ops.retire = retire_capture_urb;
989                 return start_urbs(subs, substream->runtime);
990         case SNDRV_PCM_TRIGGER_STOP:
991                 return deactivate_urbs(subs, 0, 0);
992         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
993                 subs->ops.retire = retire_paused_capture_urb;
994                 return 0;
995         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
996                 subs->ops.retire = retire_capture_urb;
997                 return 0;
998         default:
999                 return -EINVAL;
1000         }
1001 }
1002
1003
1004 /*
1005  * release a urb data
1006  */
1007 static void release_urb_ctx(struct snd_urb_ctx *u)
1008 {
1009         if (u->urb) {
1010                 if (u->buffer_size)
1011                         usb_buffer_free(u->subs->dev, u->buffer_size,
1012                                         u->urb->transfer_buffer,
1013                                         u->urb->transfer_dma);
1014                 usb_free_urb(u->urb);
1015                 u->urb = NULL;
1016         }
1017 }
1018
1019 /*
1020  * release a substream
1021  */
1022 static void release_substream_urbs(struct snd_usb_substream *subs, int force)
1023 {
1024         int i;
1025
1026         /* stop urbs (to be sure) */
1027         deactivate_urbs(subs, force, 1);
1028         wait_clear_urbs(subs);
1029
1030         for (i = 0; i < MAX_URBS; i++)
1031                 release_urb_ctx(&subs->dataurb[i]);
1032         for (i = 0; i < SYNC_URBS; i++)
1033                 release_urb_ctx(&subs->syncurb[i]);
1034         usb_buffer_free(subs->dev, SYNC_URBS * 4,
1035                         subs->syncbuf, subs->sync_dma);
1036         subs->syncbuf = NULL;
1037         subs->nurbs = 0;
1038 }
1039
1040 /*
1041  * initialize a substream for plaback/capture
1042  */
1043 static int init_substream_urbs(struct snd_usb_substream *subs, unsigned int period_bytes,
1044                                unsigned int rate, unsigned int frame_bits)
1045 {
1046         unsigned int maxsize, i;
1047         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
1048         unsigned int urb_packs, total_packs, packs_per_ms;
1049
1050         /* calculate the frequency in 16.16 format */
1051         if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
1052                 subs->freqn = get_usb_full_speed_rate(rate);
1053         else
1054                 subs->freqn = get_usb_high_speed_rate(rate);
1055         subs->freqm = subs->freqn;
1056         /* calculate max. frequency */
1057         if (subs->maxpacksize) {
1058                 /* whatever fits into a max. size packet */
1059                 maxsize = subs->maxpacksize;
1060                 subs->freqmax = (maxsize / (frame_bits >> 3))
1061                                 << (16 - subs->datainterval);
1062         } else {
1063                 /* no max. packet size: just take 25% higher than nominal */
1064                 subs->freqmax = subs->freqn + (subs->freqn >> 2);
1065                 maxsize = ((subs->freqmax + 0xffff) * (frame_bits >> 3))
1066                                 >> (16 - subs->datainterval);
1067         }
1068         subs->phase = 0;
1069
1070         if (subs->fill_max)
1071                 subs->curpacksize = subs->maxpacksize;
1072         else
1073                 subs->curpacksize = maxsize;
1074
1075         if (snd_usb_get_speed(subs->dev) == USB_SPEED_HIGH)
1076                 packs_per_ms = 8 >> subs->datainterval;
1077         else
1078                 packs_per_ms = 1;
1079
1080         if (is_playback) {
1081                 urb_packs = max(nrpacks, 1);
1082                 urb_packs = min(urb_packs, (unsigned int)MAX_PACKS);
1083         } else
1084                 urb_packs = 1;
1085         urb_packs *= packs_per_ms;
1086
1087         /* decide how many packets to be used */
1088         if (is_playback) {
1089                 unsigned int minsize, maxpacks;
1090                 /* determine how small a packet can be */
1091                 minsize = (subs->freqn >> (16 - subs->datainterval))
1092                           * (frame_bits >> 3);
1093                 /* with sync from device, assume it can be 12% lower */
1094                 if (subs->syncpipe)
1095                         minsize -= minsize >> 3;
1096                 minsize = max(minsize, 1u);
1097                 total_packs = (period_bytes + minsize - 1) / minsize;
1098                 /* we need at least two URBs for queueing */
1099                 if (total_packs < 2) {
1100                         total_packs = 2;
1101                 } else {
1102                         /* and we don't want too long a queue either */
1103                         maxpacks = max(MAX_QUEUE * packs_per_ms, urb_packs * 2);
1104                         total_packs = min(total_packs, maxpacks);
1105                 }
1106         } else {
1107                 while (urb_packs > 1 && urb_packs * maxsize >= period_bytes)
1108                         urb_packs >>= 1;
1109                 total_packs = MAX_URBS * urb_packs;
1110         }
1111         subs->nurbs = (total_packs + urb_packs - 1) / urb_packs;
1112         if (subs->nurbs > MAX_URBS) {
1113                 /* too much... */
1114                 subs->nurbs = MAX_URBS;
1115                 total_packs = MAX_URBS * urb_packs;
1116         } else if (subs->nurbs < 2) {
1117                 /* too little - we need at least two packets
1118                  * to ensure contiguous playback/capture
1119                  */
1120                 subs->nurbs = 2;
1121         }
1122
1123         /* allocate and initialize data urbs */
1124         for (i = 0; i < subs->nurbs; i++) {
1125                 struct snd_urb_ctx *u = &subs->dataurb[i];
1126                 u->index = i;
1127                 u->subs = subs;
1128                 u->packets = (i + 1) * total_packs / subs->nurbs
1129                         - i * total_packs / subs->nurbs;
1130                 u->buffer_size = maxsize * u->packets;
1131                 if (subs->fmt_type == USB_FORMAT_TYPE_II)
1132                         u->packets++; /* for transfer delimiter */
1133                 u->urb = usb_alloc_urb(u->packets, GFP_KERNEL);
1134                 if (!u->urb)
1135                         goto out_of_memory;
1136                 u->urb->transfer_buffer =
1137                         usb_buffer_alloc(subs->dev, u->buffer_size, GFP_KERNEL,
1138                                          &u->urb->transfer_dma);
1139                 if (!u->urb->transfer_buffer)
1140                         goto out_of_memory;
1141                 u->urb->pipe = subs->datapipe;
1142                 u->urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
1143                 u->urb->interval = 1 << subs->datainterval;
1144                 u->urb->context = u;
1145                 u->urb->complete = snd_complete_urb;
1146         }
1147
1148         if (subs->syncpipe) {
1149                 /* allocate and initialize sync urbs */
1150                 subs->syncbuf = usb_buffer_alloc(subs->dev, SYNC_URBS * 4,
1151                                                  GFP_KERNEL, &subs->sync_dma);
1152                 if (!subs->syncbuf)
1153                         goto out_of_memory;
1154                 for (i = 0; i < SYNC_URBS; i++) {
1155                         struct snd_urb_ctx *u = &subs->syncurb[i];
1156                         u->index = i;
1157                         u->subs = subs;
1158                         u->packets = 1;
1159                         u->urb = usb_alloc_urb(1, GFP_KERNEL);
1160                         if (!u->urb)
1161                                 goto out_of_memory;
1162                         u->urb->transfer_buffer = subs->syncbuf + i * 4;
1163                         u->urb->transfer_dma = subs->sync_dma + i * 4;
1164                         u->urb->transfer_buffer_length = 4;
1165                         u->urb->pipe = subs->syncpipe;
1166                         u->urb->transfer_flags = URB_ISO_ASAP |
1167                                                  URB_NO_TRANSFER_DMA_MAP;
1168                         u->urb->number_of_packets = 1;
1169                         u->urb->interval = 1 << subs->syncinterval;
1170                         u->urb->context = u;
1171                         u->urb->complete = snd_complete_sync_urb;
1172                 }
1173         }
1174         return 0;
1175
1176 out_of_memory:
1177         release_substream_urbs(subs, 0);
1178         return -ENOMEM;
1179 }
1180
1181
1182 /*
1183  * find a matching audio format
1184  */
1185 static struct audioformat *find_format(struct snd_usb_substream *subs, unsigned int format,
1186                                        unsigned int rate, unsigned int channels)
1187 {
1188         struct list_head *p;
1189         struct audioformat *found = NULL;
1190         int cur_attr = 0, attr;
1191
1192         list_for_each(p, &subs->fmt_list) {
1193                 struct audioformat *fp;
1194                 fp = list_entry(p, struct audioformat, list);
1195                 if (fp->format != format || fp->channels != channels)
1196                         continue;
1197                 if (rate < fp->rate_min || rate > fp->rate_max)
1198                         continue;
1199                 if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
1200                         unsigned int i;
1201                         for (i = 0; i < fp->nr_rates; i++)
1202                                 if (fp->rate_table[i] == rate)
1203                                         break;
1204                         if (i >= fp->nr_rates)
1205                                 continue;
1206                 }
1207                 attr = fp->ep_attr & EP_ATTR_MASK;
1208                 if (! found) {
1209                         found = fp;
1210                         cur_attr = attr;
1211                         continue;
1212                 }
1213                 /* avoid async out and adaptive in if the other method
1214                  * supports the same format.
1215                  * this is a workaround for the case like
1216                  * M-audio audiophile USB.
1217                  */
1218                 if (attr != cur_attr) {
1219                         if ((attr == EP_ATTR_ASYNC &&
1220                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
1221                             (attr == EP_ATTR_ADAPTIVE &&
1222                              subs->direction == SNDRV_PCM_STREAM_CAPTURE))
1223                                 continue;
1224                         if ((cur_attr == EP_ATTR_ASYNC &&
1225                              subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
1226                             (cur_attr == EP_ATTR_ADAPTIVE &&
1227                              subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
1228                                 found = fp;
1229                                 cur_attr = attr;
1230                                 continue;
1231                         }
1232                 }
1233                 /* find the format with the largest max. packet size */
1234                 if (fp->maxpacksize > found->maxpacksize) {
1235                         found = fp;
1236                         cur_attr = attr;
1237                 }
1238         }
1239         return found;
1240 }
1241
1242
1243 /*
1244  * initialize the picth control and sample rate
1245  */
1246 static int init_usb_pitch(struct usb_device *dev, int iface,
1247                           struct usb_host_interface *alts,
1248                           struct audioformat *fmt)
1249 {
1250         unsigned int ep;
1251         unsigned char data[1];
1252         int err;
1253
1254         ep = get_endpoint(alts, 0)->bEndpointAddress;
1255         /* if endpoint has pitch control, enable it */
1256         if (fmt->attributes & EP_CS_ATTR_PITCH_CONTROL) {
1257                 data[0] = 1;
1258                 if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), SET_CUR,
1259                                            USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
1260                                            PITCH_CONTROL << 8, ep, data, 1, 1000)) < 0) {
1261                         snd_printk(KERN_ERR "%d:%d:%d: cannot set enable PITCH\n",
1262                                    dev->devnum, iface, ep);
1263                         return err;
1264                 }
1265         }
1266         return 0;
1267 }
1268
1269 static int init_usb_sample_rate(struct usb_device *dev, int iface,
1270                                 struct usb_host_interface *alts,
1271                                 struct audioformat *fmt, int rate)
1272 {
1273         unsigned int ep;
1274         unsigned char data[3];
1275         int err;
1276
1277         ep = get_endpoint(alts, 0)->bEndpointAddress;
1278         /* if endpoint has sampling rate control, set it */
1279         if (fmt->attributes & EP_CS_ATTR_SAMPLE_RATE) {
1280                 int crate;
1281                 data[0] = rate;
1282                 data[1] = rate >> 8;
1283                 data[2] = rate >> 16;
1284                 if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), SET_CUR,
1285                                            USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
1286                                            SAMPLING_FREQ_CONTROL << 8, ep, data, 3, 1000)) < 0) {
1287                         snd_printk(KERN_ERR "%d:%d:%d: cannot set freq %d to ep %#x\n",
1288                                    dev->devnum, iface, fmt->altsetting, rate, ep);
1289                         return err;
1290                 }
1291                 if ((err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), GET_CUR,
1292                                            USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_IN,
1293                                            SAMPLING_FREQ_CONTROL << 8, ep, data, 3, 1000)) < 0) {
1294                         snd_printk(KERN_WARNING "%d:%d:%d: cannot get freq at ep %#x\n",
1295                                    dev->devnum, iface, fmt->altsetting, ep);
1296                         return 0; /* some devices don't support reading */
1297                 }
1298                 crate = data[0] | (data[1] << 8) | (data[2] << 16);
1299                 if (crate != rate) {
1300                         snd_printd(KERN_WARNING "current rate %d is different from the runtime rate %d\n", crate, rate);
1301                         // runtime->rate = crate;
1302                 }
1303         }
1304         return 0;
1305 }
1306
1307 /*
1308  * find a matching format and set up the interface
1309  */
1310 static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
1311 {
1312         struct usb_device *dev = subs->dev;
1313         struct usb_host_interface *alts;
1314         struct usb_interface_descriptor *altsd;
1315         struct usb_interface *iface;
1316         unsigned int ep, attr;
1317         int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
1318         int err;
1319
1320         iface = usb_ifnum_to_if(dev, fmt->iface);
1321         if (WARN_ON(!iface))
1322                 return -EINVAL;
1323         alts = &iface->altsetting[fmt->altset_idx];
1324         altsd = get_iface_desc(alts);
1325         if (WARN_ON(altsd->bAlternateSetting != fmt->altsetting))
1326                 return -EINVAL;
1327
1328         if (fmt == subs->cur_audiofmt)
1329                 return 0;
1330
1331         /* close the old interface */
1332         if (subs->interface >= 0 && subs->interface != fmt->iface) {
1333                 if (usb_set_interface(subs->dev, subs->interface, 0) < 0) {
1334                         snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed\n",
1335                                 dev->devnum, fmt->iface, fmt->altsetting);
1336                         return -EIO;
1337                 }
1338                 subs->interface = -1;
1339                 subs->format = 0;
1340         }
1341
1342         /* set interface */
1343         if (subs->interface != fmt->iface || subs->format != fmt->altset_idx) {
1344                 if (usb_set_interface(dev, fmt->iface, fmt->altsetting) < 0) {
1345                         snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed\n",
1346                                    dev->devnum, fmt->iface, fmt->altsetting);
1347                         return -EIO;
1348                 }
1349                 snd_printdd(KERN_INFO "setting usb interface %d:%d\n", fmt->iface, fmt->altsetting);
1350                 subs->interface = fmt->iface;
1351                 subs->format = fmt->altset_idx;
1352         }
1353
1354         /* create a data pipe */
1355         ep = fmt->endpoint & USB_ENDPOINT_NUMBER_MASK;
1356         if (is_playback)
1357                 subs->datapipe = usb_sndisocpipe(dev, ep);
1358         else
1359                 subs->datapipe = usb_rcvisocpipe(dev, ep);
1360         subs->datainterval = fmt->datainterval;
1361         subs->syncpipe = subs->syncinterval = 0;
1362         subs->maxpacksize = fmt->maxpacksize;
1363         subs->fill_max = 0;
1364
1365         /* we need a sync pipe in async OUT or adaptive IN mode */
1366         /* check the number of EP, since some devices have broken
1367          * descriptors which fool us.  if it has only one EP,
1368          * assume it as adaptive-out or sync-in.
1369          */
1370         attr = fmt->ep_attr & EP_ATTR_MASK;
1371         if (((is_playback && attr == EP_ATTR_ASYNC) ||
1372              (! is_playback && attr == EP_ATTR_ADAPTIVE)) &&
1373             altsd->bNumEndpoints >= 2) {
1374                 /* check sync-pipe endpoint */
1375                 /* ... and check descriptor size before accessing bSynchAddress
1376                    because there is a version of the SB Audigy 2 NX firmware lacking
1377                    the audio fields in the endpoint descriptors */
1378                 if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != 0x01 ||
1379                     (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
1380                      get_endpoint(alts, 1)->bSynchAddress != 0)) {
1381                         snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
1382                                    dev->devnum, fmt->iface, fmt->altsetting);
1383                         return -EINVAL;
1384                 }
1385                 ep = get_endpoint(alts, 1)->bEndpointAddress;
1386                 if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
1387                     (( is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
1388                      (!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
1389                         snd_printk(KERN_ERR "%d:%d:%d : invalid synch pipe\n",
1390                                    dev->devnum, fmt->iface, fmt->altsetting);
1391                         return -EINVAL;
1392                 }
1393                 ep &= USB_ENDPOINT_NUMBER_MASK;
1394                 if (is_playback)
1395                         subs->syncpipe = usb_rcvisocpipe(dev, ep);
1396                 else
1397                         subs->syncpipe = usb_sndisocpipe(dev, ep);
1398                 if (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
1399                     get_endpoint(alts, 1)->bRefresh >= 1 &&
1400                     get_endpoint(alts, 1)->bRefresh <= 9)
1401                         subs->syncinterval = get_endpoint(alts, 1)->bRefresh;
1402                 else if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
1403                         subs->syncinterval = 1;
1404                 else if (get_endpoint(alts, 1)->bInterval >= 1 &&
1405                          get_endpoint(alts, 1)->bInterval <= 16)
1406                         subs->syncinterval = get_endpoint(alts, 1)->bInterval - 1;
1407                 else
1408                         subs->syncinterval = 3;
1409         }
1410
1411         /* always fill max packet size */
1412         if (fmt->attributes & EP_CS_ATTR_FILL_MAX)
1413                 subs->fill_max = 1;
1414
1415         if ((err = init_usb_pitch(dev, subs->interface, alts, fmt)) < 0)
1416                 return err;
1417
1418         subs->cur_audiofmt = fmt;
1419
1420 #if 0
1421         printk(KERN_DEBUG
1422                "setting done: format = %d, rate = %d..%d, channels = %d\n",
1423                fmt->format, fmt->rate_min, fmt->rate_max, fmt->channels);
1424         printk(KERN_DEBUG
1425                "  datapipe = 0x%0x, syncpipe = 0x%0x\n",
1426                subs->datapipe, subs->syncpipe);
1427 #endif
1428
1429         return 0;
1430 }
1431
1432 /*
1433  * hw_params callback
1434  *
1435  * allocate a buffer and set the given audio format.
1436  *
1437  * so far we use a physically linear buffer although packetize transfer
1438  * doesn't need a continuous area.
1439  * if sg buffer is supported on the later version of alsa, we'll follow
1440  * that.
1441  */
1442 static int snd_usb_hw_params(struct snd_pcm_substream *substream,
1443                              struct snd_pcm_hw_params *hw_params)
1444 {
1445         struct snd_usb_substream *subs = substream->runtime->private_data;
1446         struct audioformat *fmt;
1447         unsigned int channels, rate, format;
1448         int ret, changed;
1449
1450         ret = snd_pcm_alloc_vmalloc_buffer(substream,
1451                                            params_buffer_bytes(hw_params));
1452         if (ret < 0)
1453                 return ret;
1454
1455         format = params_format(hw_params);
1456         rate = params_rate(hw_params);
1457         channels = params_channels(hw_params);
1458         fmt = find_format(subs, format, rate, channels);
1459         if (!fmt) {
1460                 snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n",
1461                            format, rate, channels);
1462                 return -EINVAL;
1463         }
1464
1465         changed = subs->cur_audiofmt != fmt ||
1466                 subs->period_bytes != params_period_bytes(hw_params) ||
1467                 subs->cur_rate != rate;
1468         if ((ret = set_format(subs, fmt)) < 0)
1469                 return ret;
1470
1471         if (subs->cur_rate != rate) {
1472                 struct usb_host_interface *alts;
1473                 struct usb_interface *iface;
1474                 iface = usb_ifnum_to_if(subs->dev, fmt->iface);
1475                 alts = &iface->altsetting[fmt->altset_idx];
1476                 ret = init_usb_sample_rate(subs->dev, subs->interface, alts, fmt, rate);
1477                 if (ret < 0)
1478                         return ret;
1479                 subs->cur_rate = rate;
1480         }
1481
1482         if (changed) {
1483                 /* format changed */
1484                 release_substream_urbs(subs, 0);
1485                 /* influenced: period_bytes, channels, rate, format, */
1486                 ret = init_substream_urbs(subs, params_period_bytes(hw_params),
1487                                           params_rate(hw_params),
1488                                           snd_pcm_format_physical_width(params_format(hw_params)) * params_channels(hw_params));
1489         }
1490
1491         return ret;
1492 }
1493
1494 /*
1495  * hw_free callback
1496  *
1497  * reset the audio format and release the buffer
1498  */
1499 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
1500 {
1501         struct snd_usb_substream *subs = substream->runtime->private_data;
1502
1503         subs->cur_audiofmt = NULL;
1504         subs->cur_rate = 0;
1505         subs->period_bytes = 0;
1506         if (!subs->stream->chip->shutdown)
1507                 release_substream_urbs(subs, 0);
1508         return snd_pcm_free_vmalloc_buffer(substream);
1509 }
1510
1511 /*
1512  * prepare callback
1513  *
1514  * only a few subtle things...
1515  */
1516 static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
1517 {
1518         struct snd_pcm_runtime *runtime = substream->runtime;
1519         struct snd_usb_substream *subs = runtime->private_data;
1520
1521         if (! subs->cur_audiofmt) {
1522                 snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
1523                 return -ENXIO;
1524         }
1525
1526         /* some unit conversions in runtime */
1527         subs->maxframesize = bytes_to_frames(runtime, subs->maxpacksize);
1528         subs->curframesize = bytes_to_frames(runtime, subs->curpacksize);
1529
1530         /* reset the pointer */
1531         subs->hwptr_done = 0;
1532         subs->transfer_done = 0;
1533         subs->phase = 0;
1534         runtime->delay = 0;
1535
1536         /* clear urbs (to be sure) */
1537         deactivate_urbs(subs, 0, 1);
1538         wait_clear_urbs(subs);
1539
1540         /* for playback, submit the URBs now; otherwise, the first hwptr_done
1541          * updates for all URBs would happen at the same time when starting */
1542         if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) {
1543                 subs->ops.prepare = prepare_nodata_playback_urb;
1544                 return start_urbs(subs, runtime);
1545         } else
1546                 return 0;
1547 }
1548
1549 static struct snd_pcm_hardware snd_usb_hardware =
1550 {
1551         .info =                 SNDRV_PCM_INFO_MMAP |
1552                                 SNDRV_PCM_INFO_MMAP_VALID |
1553                                 SNDRV_PCM_INFO_BATCH |
1554                                 SNDRV_PCM_INFO_INTERLEAVED |
1555                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
1556                                 SNDRV_PCM_INFO_PAUSE,
1557         .buffer_bytes_max =     1024 * 1024,
1558         .period_bytes_min =     64,
1559         .period_bytes_max =     512 * 1024,
1560         .periods_min =          2,
1561         .periods_max =          1024,
1562 };
1563
1564 /*
1565  * h/w constraints
1566  */
1567
1568 #ifdef HW_CONST_DEBUG
1569 #define hwc_debug(fmt, args...) printk(KERN_DEBUG fmt, ##args)
1570 #else
1571 #define hwc_debug(fmt, args...) /**/
1572 #endif
1573
1574 static int hw_check_valid_format(struct snd_usb_substream *subs,
1575                                  struct snd_pcm_hw_params *params,
1576                                  struct audioformat *fp)
1577 {
1578         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1579         struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
1580         struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1581         struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
1582         unsigned int ptime;
1583
1584         /* check the format */
1585         if (!snd_mask_test(fmts, fp->format)) {
1586                 hwc_debug("   > check: no supported format %d\n", fp->format);
1587                 return 0;
1588         }
1589         /* check the channels */
1590         if (fp->channels < ct->min || fp->channels > ct->max) {
1591                 hwc_debug("   > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
1592                 return 0;
1593         }
1594         /* check the rate is within the range */
1595         if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
1596                 hwc_debug("   > check: rate_min %d > max %d\n", fp->rate_min, it->max);
1597                 return 0;
1598         }
1599         if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
1600                 hwc_debug("   > check: rate_max %d < min %d\n", fp->rate_max, it->min);
1601                 return 0;
1602         }
1603         /* check whether the period time is >= the data packet interval */
1604         if (snd_usb_get_speed(subs->dev) == USB_SPEED_HIGH) {
1605                 ptime = 125 * (1 << fp->datainterval);
1606                 if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
1607                         hwc_debug("   > check: ptime %u > max %u\n", ptime, pt->max);
1608                         return 0;
1609                 }
1610         }
1611         return 1;
1612 }
1613
1614 static int hw_rule_rate(struct snd_pcm_hw_params *params,
1615                         struct snd_pcm_hw_rule *rule)
1616 {
1617         struct snd_usb_substream *subs = rule->private;
1618         struct list_head *p;
1619         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1620         unsigned int rmin, rmax;
1621         int changed;
1622
1623         hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
1624         changed = 0;
1625         rmin = rmax = 0;
1626         list_for_each(p, &subs->fmt_list) {
1627                 struct audioformat *fp;
1628                 fp = list_entry(p, struct audioformat, list);
1629                 if (!hw_check_valid_format(subs, params, fp))
1630                         continue;
1631                 if (changed++) {
1632                         if (rmin > fp->rate_min)
1633                                 rmin = fp->rate_min;
1634                         if (rmax < fp->rate_max)
1635                                 rmax = fp->rate_max;
1636                 } else {
1637                         rmin = fp->rate_min;
1638                         rmax = fp->rate_max;
1639                 }
1640         }
1641
1642         if (!changed) {
1643                 hwc_debug("  --> get empty\n");
1644                 it->empty = 1;
1645                 return -EINVAL;
1646         }
1647
1648         changed = 0;
1649         if (it->min < rmin) {
1650                 it->min = rmin;
1651                 it->openmin = 0;
1652                 changed = 1;
1653         }
1654         if (it->max > rmax) {
1655                 it->max = rmax;
1656                 it->openmax = 0;
1657                 changed = 1;
1658         }
1659         if (snd_interval_checkempty(it)) {
1660                 it->empty = 1;
1661                 return -EINVAL;
1662         }
1663         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1664         return changed;
1665 }
1666
1667
1668 static int hw_rule_channels(struct snd_pcm_hw_params *params,
1669                             struct snd_pcm_hw_rule *rule)
1670 {
1671         struct snd_usb_substream *subs = rule->private;
1672         struct list_head *p;
1673         struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
1674         unsigned int rmin, rmax;
1675         int changed;
1676
1677         hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
1678         changed = 0;
1679         rmin = rmax = 0;
1680         list_for_each(p, &subs->fmt_list) {
1681                 struct audioformat *fp;
1682                 fp = list_entry(p, struct audioformat, list);
1683                 if (!hw_check_valid_format(subs, params, fp))
1684                         continue;
1685                 if (changed++) {
1686                         if (rmin > fp->channels)
1687                                 rmin = fp->channels;
1688                         if (rmax < fp->channels)
1689                                 rmax = fp->channels;
1690                 } else {
1691                         rmin = fp->channels;
1692                         rmax = fp->channels;
1693                 }
1694         }
1695
1696         if (!changed) {
1697                 hwc_debug("  --> get empty\n");
1698                 it->empty = 1;
1699                 return -EINVAL;
1700         }
1701
1702         changed = 0;
1703         if (it->min < rmin) {
1704                 it->min = rmin;
1705                 it->openmin = 0;
1706                 changed = 1;
1707         }
1708         if (it->max > rmax) {
1709                 it->max = rmax;
1710                 it->openmax = 0;
1711                 changed = 1;
1712         }
1713         if (snd_interval_checkempty(it)) {
1714                 it->empty = 1;
1715                 return -EINVAL;
1716         }
1717         hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
1718         return changed;
1719 }
1720
1721 static int hw_rule_format(struct snd_pcm_hw_params *params,
1722                           struct snd_pcm_hw_rule *rule)
1723 {
1724         struct snd_usb_substream *subs = rule->private;
1725         struct list_head *p;
1726         struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1727         u64 fbits;
1728         u32 oldbits[2];
1729         int changed;
1730
1731         hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
1732         fbits = 0;
1733         list_for_each(p, &subs->fmt_list) {
1734                 struct audioformat *fp;
1735                 fp = list_entry(p, struct audioformat, list);
1736                 if (!hw_check_valid_format(subs, params, fp))
1737                         continue;
1738                 fbits |= (1ULL << fp->format);
1739         }
1740
1741         oldbits[0] = fmt->bits[0];
1742         oldbits[1] = fmt->bits[1];
1743         fmt->bits[0] &= (u32)fbits;
1744         fmt->bits[1] &= (u32)(fbits >> 32);
1745         if (!fmt->bits[0] && !fmt->bits[1]) {
1746                 hwc_debug("  --> get empty\n");
1747                 return -EINVAL;
1748         }
1749         changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
1750         hwc_debug("  --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
1751         return changed;
1752 }
1753
1754 static int hw_rule_period_time(struct snd_pcm_hw_params *params,
1755                                struct snd_pcm_hw_rule *rule)
1756 {
1757         struct snd_usb_substream *subs = rule->private;
1758         struct audioformat *fp;
1759         struct snd_interval *it;
1760         unsigned char min_datainterval;
1761         unsigned int pmin;
1762         int changed;
1763
1764         it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
1765         hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
1766         min_datainterval = 0xff;
1767         list_for_each_entry(fp, &subs->fmt_list, list) {
1768                 if (!hw_check_valid_format(subs, params, fp))
1769                         continue;
1770                 min_datainterval = min(min_datainterval, fp->datainterval);
1771         }
1772         if (min_datainterval == 0xff) {
1773                 hwc_debug("  --> get emtpy\n");
1774                 it->empty = 1;
1775                 return -EINVAL;
1776         }
1777         pmin = 125 * (1 << min_datainterval);
1778         changed = 0;
1779         if (it->min < pmin) {
1780                 it->min = pmin;
1781                 it->openmin = 0;
1782                 changed = 1;
1783         }
1784         if (snd_interval_checkempty(it)) {
1785                 it->empty = 1;
1786                 return -EINVAL;
1787         }
1788         hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
1789         return changed;
1790 }
1791
1792 /*
1793  *  If the device supports unusual bit rates, does the request meet these?
1794  */
1795 static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
1796                                   struct snd_usb_substream *subs)
1797 {
1798         struct audioformat *fp;
1799         int count = 0, needs_knot = 0;
1800         int err;
1801
1802         list_for_each_entry(fp, &subs->fmt_list, list) {
1803                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
1804                         return 0;
1805                 count += fp->nr_rates;
1806                 if (fp->rates & SNDRV_PCM_RATE_KNOT)
1807                         needs_knot = 1;
1808         }
1809         if (!needs_knot)
1810                 return 0;
1811
1812         subs->rate_list.count = count;
1813         subs->rate_list.list = kmalloc(sizeof(int) * count, GFP_KERNEL);
1814         subs->rate_list.mask = 0;
1815         count = 0;
1816         list_for_each_entry(fp, &subs->fmt_list, list) {
1817                 int i;
1818                 for (i = 0; i < fp->nr_rates; i++)
1819                         subs->rate_list.list[count++] = fp->rate_table[i];
1820         }
1821         err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1822                                          &subs->rate_list);
1823         if (err < 0)
1824                 return err;
1825
1826         return 0;
1827 }
1828
1829
1830 /*
1831  * set up the runtime hardware information.
1832  */
1833
1834 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
1835 {
1836         struct list_head *p;
1837         unsigned int pt, ptmin;
1838         int param_period_time_if_needed;
1839         int err;
1840
1841         runtime->hw.formats = subs->formats;
1842
1843         runtime->hw.rate_min = 0x7fffffff;
1844         runtime->hw.rate_max = 0;
1845         runtime->hw.channels_min = 256;
1846         runtime->hw.channels_max = 0;
1847         runtime->hw.rates = 0;
1848         ptmin = UINT_MAX;
1849         /* check min/max rates and channels */
1850         list_for_each(p, &subs->fmt_list) {
1851                 struct audioformat *fp;
1852                 fp = list_entry(p, struct audioformat, list);
1853                 runtime->hw.rates |= fp->rates;
1854                 if (runtime->hw.rate_min > fp->rate_min)
1855                         runtime->hw.rate_min = fp->rate_min;
1856                 if (runtime->hw.rate_max < fp->rate_max)
1857                         runtime->hw.rate_max = fp->rate_max;
1858                 if (runtime->hw.channels_min > fp->channels)
1859                         runtime->hw.channels_min = fp->channels;
1860                 if (runtime->hw.channels_max < fp->channels)
1861                         runtime->hw.channels_max = fp->channels;
1862                 if (fp->fmt_type == USB_FORMAT_TYPE_II && fp->frame_size > 0) {
1863                         /* FIXME: there might be more than one audio formats... */
1864                         runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
1865                                 fp->frame_size;
1866                 }
1867                 pt = 125 * (1 << fp->datainterval);
1868                 ptmin = min(ptmin, pt);
1869         }
1870
1871         param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
1872         if (snd_usb_get_speed(subs->dev) != USB_SPEED_HIGH)
1873                 /* full speed devices have fixed data packet interval */
1874                 ptmin = 1000;
1875         if (ptmin == 1000)
1876                 /* if period time doesn't go below 1 ms, no rules needed */
1877                 param_period_time_if_needed = -1;
1878         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1879                                      ptmin, UINT_MAX);
1880
1881         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1882                                        hw_rule_rate, subs,
1883                                        SNDRV_PCM_HW_PARAM_FORMAT,
1884                                        SNDRV_PCM_HW_PARAM_CHANNELS,
1885                                        param_period_time_if_needed,
1886                                        -1)) < 0)
1887                 return err;
1888         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1889                                        hw_rule_channels, subs,
1890                                        SNDRV_PCM_HW_PARAM_FORMAT,
1891                                        SNDRV_PCM_HW_PARAM_RATE,
1892                                        param_period_time_if_needed,
1893                                        -1)) < 0)
1894                 return err;
1895         if ((err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1896                                        hw_rule_format, subs,
1897                                        SNDRV_PCM_HW_PARAM_RATE,
1898                                        SNDRV_PCM_HW_PARAM_CHANNELS,
1899                                        param_period_time_if_needed,
1900                                        -1)) < 0)
1901                 return err;
1902         if (param_period_time_if_needed >= 0) {
1903                 err = snd_pcm_hw_rule_add(runtime, 0,
1904                                           SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1905                                           hw_rule_period_time, subs,
1906                                           SNDRV_PCM_HW_PARAM_FORMAT,
1907                                           SNDRV_PCM_HW_PARAM_CHANNELS,
1908                                           SNDRV_PCM_HW_PARAM_RATE,
1909                                           -1);
1910                 if (err < 0)
1911                         return err;
1912         }
1913         if ((err = snd_usb_pcm_check_knot(runtime, subs)) < 0)
1914                 return err;
1915         return 0;
1916 }
1917
1918 static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
1919 {
1920         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1921         struct snd_pcm_runtime *runtime = substream->runtime;
1922         struct snd_usb_substream *subs = &as->substream[direction];
1923
1924         subs->interface = -1;
1925         subs->format = 0;
1926         runtime->hw = snd_usb_hardware;
1927         runtime->private_data = subs;
1928         subs->pcm_substream = substream;
1929         return setup_hw_info(runtime, subs);
1930 }
1931
1932 static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
1933 {
1934         struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
1935         struct snd_usb_substream *subs = &as->substream[direction];
1936
1937         if (subs->interface >= 0) {
1938                 usb_set_interface(subs->dev, subs->interface, 0);
1939                 subs->interface = -1;
1940         }
1941         subs->pcm_substream = NULL;
1942         return 0;
1943 }
1944
1945 static int snd_usb_playback_open(struct snd_pcm_substream *substream)
1946 {
1947         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_PLAYBACK);
1948 }
1949
1950 static int snd_usb_playback_close(struct snd_pcm_substream *substream)
1951 {
1952         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
1953 }
1954
1955 static int snd_usb_capture_open(struct snd_pcm_substream *substream)
1956 {
1957         return snd_usb_pcm_open(substream, SNDRV_PCM_STREAM_CAPTURE);
1958 }
1959
1960 static int snd_usb_capture_close(struct snd_pcm_substream *substream)
1961 {
1962         return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
1963 }
1964
1965 static struct snd_pcm_ops snd_usb_playback_ops = {
1966         .open =         snd_usb_playback_open,
1967         .close =        snd_usb_playback_close,
1968         .ioctl =        snd_pcm_lib_ioctl,
1969         .hw_params =    snd_usb_hw_params,
1970         .hw_free =      snd_usb_hw_free,
1971         .prepare =      snd_usb_pcm_prepare,
1972         .trigger =      snd_usb_pcm_playback_trigger,
1973         .pointer =      snd_usb_pcm_pointer,
1974         .page =         snd_pcm_get_vmalloc_page,
1975 };
1976
1977 static struct snd_pcm_ops snd_usb_capture_ops = {
1978         .open =         snd_usb_capture_open,
1979         .close =        snd_usb_capture_close,
1980         .ioctl =        snd_pcm_lib_ioctl,
1981         .hw_params =    snd_usb_hw_params,
1982         .hw_free =      snd_usb_hw_free,
1983         .prepare =      snd_usb_pcm_prepare,
1984         .trigger =      snd_usb_pcm_capture_trigger,
1985         .pointer =      snd_usb_pcm_pointer,
1986         .page =         snd_pcm_get_vmalloc_page,
1987 };
1988
1989
1990
1991 /*
1992  * helper functions
1993  */
1994
1995 /*
1996  * combine bytes and get an integer value
1997  */
1998 unsigned int snd_usb_combine_bytes(unsigned char *bytes, int size)
1999 {
2000         switch (size) {
2001         case 1:  return *bytes;
2002         case 2:  return combine_word(bytes);
2003         case 3:  return combine_triple(bytes);
2004         case 4:  return combine_quad(bytes);
2005         default: return 0;
2006         }
2007 }
2008
2009 /*
2010  * parse descriptor buffer and return the pointer starting the given
2011  * descriptor type.
2012  */
2013 void *snd_usb_find_desc(void *descstart, int desclen, void *after, u8 dtype)
2014 {
2015         u8 *p, *end, *next;
2016
2017         p = descstart;
2018         end = p + desclen;
2019         for (; p < end;) {
2020                 if (p[0] < 2)
2021                         return NULL;
2022                 next = p + p[0];
2023                 if (next > end)
2024                         return NULL;
2025                 if (p[1] == dtype && (!after || (void *)p > after)) {
2026                         return p;
2027                 }
2028                 p = next;
2029         }
2030         return NULL;
2031 }
2032
2033 /*
2034  * find a class-specified interface descriptor with the given subtype.
2035  */
2036 void *snd_usb_find_csint_desc(void *buffer, int buflen, void *after, u8 dsubtype)
2037 {
2038         unsigned char *p = after;
2039
2040         while ((p = snd_usb_find_desc(buffer, buflen, p,
2041                                       USB_DT_CS_INTERFACE)) != NULL) {
2042                 if (p[0] >= 3 && p[2] == dsubtype)
2043                         return p;
2044         }
2045         return NULL;
2046 }
2047
2048 /*
2049  * Wrapper for usb_control_msg().
2050  * Allocates a temp buffer to prevent dmaing from/to the stack.
2051  */
2052 int snd_usb_ctl_msg(struct usb_device *dev, unsigned int pipe, __u8 request,
2053                     __u8 requesttype, __u16 value, __u16 index, void *data,
2054                     __u16 size, int timeout)
2055 {
2056         int err;
2057         void *buf = NULL;
2058
2059         if (size > 0) {
2060                 buf = kmemdup(data, size, GFP_KERNEL);
2061                 if (!buf)
2062                         return -ENOMEM;
2063         }
2064         err = usb_control_msg(dev, pipe, request, requesttype,
2065                               value, index, buf, size, timeout);
2066         if (size > 0) {
2067                 memcpy(data, buf, size);
2068                 kfree(buf);
2069         }
2070         return err;
2071 }
2072
2073
2074 /*
2075  * entry point for linux usb interface
2076  */
2077
2078 static int usb_audio_probe(struct usb_interface *intf,
2079                            const struct usb_device_id *id);
2080 static void usb_audio_disconnect(struct usb_interface *intf);
2081
2082 #ifdef CONFIG_PM
2083 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message);
2084 static int usb_audio_resume(struct usb_interface *intf);
2085 #else
2086 #define usb_audio_suspend NULL
2087 #define usb_audio_resume NULL
2088 #endif
2089
2090 static struct usb_device_id usb_audio_ids [] = {
2091 #include "usbquirks.h"
2092     { .match_flags = (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS),
2093       .bInterfaceClass = USB_CLASS_AUDIO,
2094       .bInterfaceSubClass = USB_SUBCLASS_AUDIO_CONTROL },
2095     { }                                         /* Terminating entry */
2096 };
2097
2098 MODULE_DEVICE_TABLE (usb, usb_audio_ids);
2099
2100 static struct usb_driver usb_audio_driver = {
2101         .name =         "snd-usb-audio",
2102         .probe =        usb_audio_probe,
2103         .disconnect =   usb_audio_disconnect,
2104         .suspend =      usb_audio_suspend,
2105         .resume =       usb_audio_resume,
2106         .id_table =     usb_audio_ids,
2107 };
2108
2109
2110 #if defined(CONFIG_PROC_FS) && defined(CONFIG_SND_VERBOSE_PROCFS)
2111
2112 /*
2113  * proc interface for list the supported pcm formats
2114  */
2115 static void proc_dump_substream_formats(struct snd_usb_substream *subs, struct snd_info_buffer *buffer)
2116 {
2117         struct list_head *p;
2118         static char *sync_types[4] = {
2119                 "NONE", "ASYNC", "ADAPTIVE", "SYNC"
2120         };
2121
2122         list_for_each(p, &subs->fmt_list) {
2123                 struct audioformat *fp;
2124                 fp = list_entry(p, struct audioformat, list);
2125                 snd_iprintf(buffer, "  Interface %d\n", fp->iface);
2126                 snd_iprintf(buffer, "    Altset %d\n", fp->altsetting);
2127                 snd_iprintf(buffer, "    Format: %#x (%d bits)\n",
2128                             fp->format, snd_pcm_format_width(fp->format));
2129                 snd_iprintf(buffer, "    Channels: %d\n", fp->channels);
2130                 snd_iprintf(buffer, "    Endpoint: %d %s (%s)\n",
2131                             fp->endpoint & USB_ENDPOINT_NUMBER_MASK,
2132                             fp->endpoint & USB_DIR_IN ? "IN" : "OUT",
2133                             sync_types[(fp->ep_attr & EP_ATTR_MASK) >> 2]);
2134                 if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS) {
2135                         snd_iprintf(buffer, "    Rates: %d - %d (continuous)\n",
2136                                     fp->rate_min, fp->rate_max);
2137                 } else {
2138                         unsigned int i;
2139                         snd_iprintf(buffer, "    Rates: ");
2140                         for (i = 0; i < fp->nr_rates; i++) {
2141                                 if (i > 0)
2142                                         snd_iprintf(buffer, ", ");
2143                                 snd_iprintf(buffer, "%d", fp->rate_table[i]);
2144                         }
2145                         snd_iprintf(buffer, "\n");
2146                 }
2147                 if (snd_usb_get_speed(subs->dev) == USB_SPEED_HIGH)
2148                         snd_iprintf(buffer, "    Data packet interval: %d us\n",
2149                                     125 * (1 << fp->datainterval));
2150                 // snd_iprintf(buffer, "    Max Packet Size = %d\n", fp->maxpacksize);
2151                 // snd_iprintf(buffer, "    EP Attribute = %#x\n", fp->attributes);
2152         }
2153 }
2154
2155 static void proc_dump_substream_status(struct snd_usb_substream *subs, struct snd_info_buffer *buffer)
2156 {
2157         if (subs->running) {
2158                 unsigned int i;
2159                 snd_iprintf(buffer, "  Status: Running\n");
2160                 snd_iprintf(buffer, "    Interface = %d\n", subs->interface);
2161                 snd_iprintf(buffer, "    Altset = %d\n", subs->format);
2162                 snd_iprintf(buffer, "    URBs = %d [ ", subs->nurbs);
2163                 for (i = 0; i < subs->nurbs; i++)
2164                         snd_iprintf(buffer, "%d ", subs->dataurb[i].packets);
2165                 snd_iprintf(buffer, "]\n");
2166                 snd_iprintf(buffer, "    Packet Size = %d\n", subs->curpacksize);
2167                 snd_iprintf(buffer, "    Momentary freq = %u Hz (%#x.%04x)\n",
2168                             snd_usb_get_speed(subs->dev) == USB_SPEED_FULL
2169                             ? get_full_speed_hz(subs->freqm)
2170                             : get_high_speed_hz(subs->freqm),
2171                             subs->freqm >> 16, subs->freqm & 0xffff);
2172         } else {
2173                 snd_iprintf(buffer, "  Status: Stop\n");
2174         }
2175 }
2176
2177 static void proc_pcm_format_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
2178 {
2179         struct snd_usb_stream *stream = entry->private_data;
2180
2181         snd_iprintf(buffer, "%s : %s\n", stream->chip->card->longname, stream->pcm->name);
2182
2183         if (stream->substream[SNDRV_PCM_STREAM_PLAYBACK].num_formats) {
2184                 snd_iprintf(buffer, "\nPlayback:\n");
2185                 proc_dump_substream_status(&stream->substream[SNDRV_PCM_STREAM_PLAYBACK], buffer);
2186                 proc_dump_substream_formats(&stream->substream[SNDRV_PCM_STREAM_PLAYBACK], buffer);
2187         }
2188         if (stream->substream[SNDRV_PCM_STREAM_CAPTURE].num_formats) {
2189                 snd_iprintf(buffer, "\nCapture:\n");
2190                 proc_dump_substream_status(&stream->substream[SNDRV_PCM_STREAM_CAPTURE], buffer);
2191                 proc_dump_substream_formats(&stream->substream[SNDRV_PCM_STREAM_CAPTURE], buffer);
2192         }
2193 }
2194
2195 static void proc_pcm_format_add(struct snd_usb_stream *stream)
2196 {
2197         struct snd_info_entry *entry;
2198         char name[32];
2199         struct snd_card *card = stream->chip->card;
2200
2201         sprintf(name, "stream%d", stream->pcm_index);
2202         if (!snd_card_proc_new(card, name, &entry))
2203                 snd_info_set_text_ops(entry, stream, proc_pcm_format_read);
2204 }
2205
2206 #else
2207
2208 static inline void proc_pcm_format_add(struct snd_usb_stream *stream)
2209 {
2210 }
2211
2212 #endif
2213
2214 /*
2215  * initialize the substream instance.
2216  */
2217
2218 static void init_substream(struct snd_usb_stream *as, int stream, struct audioformat *fp)
2219 {
2220         struct snd_usb_substream *subs = &as->substream[stream];
2221
2222         INIT_LIST_HEAD(&subs->fmt_list);
2223         spin_lock_init(&subs->lock);
2224
2225         subs->stream = as;
2226         subs->direction = stream;
2227         subs->dev = as->chip->dev;
2228         if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL) {
2229                 subs->ops = audio_urb_ops[stream];
2230         } else {
2231                 subs->ops = audio_urb_ops_high_speed[stream];
2232                 switch (as->chip->usb_id) {
2233                 case USB_ID(0x041e, 0x3f02): /* E-Mu 0202 USB */
2234                 case USB_ID(0x041e, 0x3f04): /* E-Mu 0404 USB */
2235                 case USB_ID(0x041e, 0x3f0a): /* E-Mu Tracker Pre */
2236                         subs->ops.retire_sync = retire_playback_sync_urb_hs_emu;
2237                         break;
2238                 }
2239         }
2240         snd_pcm_set_ops(as->pcm, stream,
2241                         stream == SNDRV_PCM_STREAM_PLAYBACK ?
2242                         &snd_usb_playback_ops : &snd_usb_capture_ops);
2243
2244         list_add_tail(&fp->list, &subs->fmt_list);
2245         subs->formats |= 1ULL << fp->format;
2246         subs->endpoint = fp->endpoint;
2247         subs->num_formats++;
2248         subs->fmt_type = fp->fmt_type;
2249 }
2250
2251
2252 /*
2253  * free a substream
2254  */
2255 static void free_substream(struct snd_usb_substream *subs)
2256 {
2257         struct list_head *p, *n;
2258
2259         if (!subs->num_formats)
2260                 return; /* not initialized */
2261         list_for_each_safe(p, n, &subs->fmt_list) {
2262                 struct audioformat *fp = list_entry(p, struct audioformat, list);
2263                 kfree(fp->rate_table);
2264                 kfree(fp);
2265         }
2266         kfree(subs->rate_list.list);
2267 }
2268
2269
2270 /*
2271  * free a usb stream instance
2272  */
2273 static void snd_usb_audio_stream_free(struct snd_usb_stream *stream)
2274 {
2275         free_substream(&stream->substream[0]);
2276         free_substream(&stream->substream[1]);
2277         list_del(&stream->list);
2278         kfree(stream);
2279 }
2280
2281 static void snd_usb_audio_pcm_free(struct snd_pcm *pcm)
2282 {
2283         struct snd_usb_stream *stream = pcm->private_data;
2284         if (stream) {
2285                 stream->pcm = NULL;
2286                 snd_usb_audio_stream_free(stream);
2287         }
2288 }
2289
2290
2291 /*
2292  * add this endpoint to the chip instance.
2293  * if a stream with the same endpoint already exists, append to it.
2294  * if not, create a new pcm stream.
2295  */
2296 static int add_audio_endpoint(struct snd_usb_audio *chip, int stream, struct audioformat *fp)
2297 {
2298         struct list_head *p;
2299         struct snd_usb_stream *as;
2300         struct snd_usb_substream *subs;
2301         struct snd_pcm *pcm;
2302         int err;
2303
2304         list_for_each(p, &chip->pcm_list) {
2305                 as = list_entry(p, struct snd_usb_stream, list);
2306                 if (as->fmt_type != fp->fmt_type)
2307                         continue;
2308                 subs = &as->substream[stream];
2309                 if (!subs->endpoint)
2310                         continue;
2311                 if (subs->endpoint == fp->endpoint) {
2312                         list_add_tail(&fp->list, &subs->fmt_list);
2313                         subs->num_formats++;
2314                         subs->formats |= 1ULL << fp->format;
2315                         return 0;
2316                 }
2317         }
2318         /* look for an empty stream */
2319         list_for_each(p, &chip->pcm_list) {
2320                 as = list_entry(p, struct snd_usb_stream, list);
2321                 if (as->fmt_type != fp->fmt_type)
2322                         continue;
2323                 subs = &as->substream[stream];
2324                 if (subs->endpoint)
2325                         continue;
2326                 err = snd_pcm_new_stream(as->pcm, stream, 1);
2327                 if (err < 0)
2328                         return err;
2329                 init_substream(as, stream, fp);
2330                 return 0;
2331         }
2332
2333         /* create a new pcm */
2334         as = kzalloc(sizeof(*as), GFP_KERNEL);
2335         if (!as)
2336                 return -ENOMEM;
2337         as->pcm_index = chip->pcm_devs;
2338         as->chip = chip;
2339         as->fmt_type = fp->fmt_type;
2340         err = snd_pcm_new(chip->card, "USB Audio", chip->pcm_devs,
2341                           stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0,
2342                           stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1,
2343                           &pcm);
2344         if (err < 0) {
2345                 kfree(as);
2346                 return err;
2347         }
2348         as->pcm = pcm;
2349         pcm->private_data = as;
2350         pcm->private_free = snd_usb_audio_pcm_free;
2351         pcm->info_flags = 0;
2352         if (chip->pcm_devs > 0)
2353                 sprintf(pcm->name, "USB Audio #%d", chip->pcm_devs);
2354         else
2355                 strcpy(pcm->name, "USB Audio");
2356
2357         init_substream(as, stream, fp);
2358
2359         list_add(&as->list, &chip->pcm_list);
2360         chip->pcm_devs++;
2361
2362         proc_pcm_format_add(as);
2363
2364         return 0;
2365 }
2366
2367
2368 /*
2369  * check if the device uses big-endian samples
2370  */
2371 static int is_big_endian_format(struct snd_usb_audio *chip, struct audioformat *fp)
2372 {
2373         switch (chip->usb_id) {
2374         case USB_ID(0x0763, 0x2001): /* M-Audio Quattro: captured data only */
2375                 if (fp->endpoint & USB_DIR_IN)
2376                         return 1;
2377                 break;
2378         case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
2379                 if (device_setup[chip->index] == 0x00 ||
2380                     fp->altsetting==1 || fp->altsetting==2 || fp->altsetting==3)
2381                         return 1;
2382         }
2383         return 0;
2384 }
2385
2386 /*
2387  * parse the audio format type I descriptor
2388  * and returns the corresponding pcm format
2389  *
2390  * @dev: usb device
2391  * @fp: audioformat record
2392  * @format: the format tag (wFormatTag)
2393  * @fmt: the format type descriptor
2394  */
2395 static int parse_audio_format_i_type(struct snd_usb_audio *chip, struct audioformat *fp,
2396                                      int format, unsigned char *fmt)
2397 {
2398         int pcm_format;
2399         int sample_width, sample_bytes;
2400
2401         /* FIXME: correct endianess and sign? */
2402         pcm_format = -1;
2403         sample_width = fmt[6];
2404         sample_bytes = fmt[5];
2405         switch (format) {
2406         case 0: /* some devices don't define this correctly... */
2407                 snd_printdd(KERN_INFO "%d:%u:%d : format type 0 is detected, processed as PCM\n",
2408                             chip->dev->devnum, fp->iface, fp->altsetting);
2409                 /* fall-through */
2410         case USB_AUDIO_FORMAT_PCM:
2411                 if (sample_width > sample_bytes * 8) {
2412                         snd_printk(KERN_INFO "%d:%u:%d : sample bitwidth %d in over sample bytes %d\n",
2413                                    chip->dev->devnum, fp->iface, fp->altsetting,
2414                                    sample_width, sample_bytes);
2415                 }
2416                 /* check the format byte size */
2417                 switch (fmt[5]) {
2418                 case 1:
2419                         pcm_format = SNDRV_PCM_FORMAT_S8;
2420                         break;
2421                 case 2:
2422                         if (is_big_endian_format(chip, fp))
2423                                 pcm_format = SNDRV_PCM_FORMAT_S16_BE; /* grrr, big endian!! */
2424                         else
2425                                 pcm_format = SNDRV_PCM_FORMAT_S16_LE;
2426                         break;
2427                 case 3:
2428                         if (is_big_endian_format(chip, fp))
2429                                 pcm_format = SNDRV_PCM_FORMAT_S24_3BE; /* grrr, big endian!! */
2430                         else
2431                                 pcm_format = SNDRV_PCM_FORMAT_S24_3LE;
2432                         break;
2433                 case 4:
2434                         pcm_format = SNDRV_PCM_FORMAT_S32_LE;
2435                         break;
2436                 default:
2437                         snd_printk(KERN_INFO "%d:%u:%d : unsupported sample bitwidth %d in %d bytes\n",
2438                                    chip->dev->devnum, fp->iface,
2439                                    fp->altsetting, sample_width, sample_bytes);
2440                         break;
2441                 }
2442                 break;
2443         case USB_AUDIO_FORMAT_PCM8:
2444                 pcm_format = SNDRV_PCM_FORMAT_U8;
2445
2446                 /* Dallas DS4201 workaround: it advertises U8 format, but really
2447                    supports S8. */
2448                 if (chip->usb_id == USB_ID(0x04fa, 0x4201))
2449                         pcm_format = SNDRV_PCM_FORMAT_S8;
2450                 break;
2451         case USB_AUDIO_FORMAT_IEEE_FLOAT:
2452                 pcm_format = SNDRV_PCM_FORMAT_FLOAT_LE;
2453                 break;
2454         case USB_AUDIO_FORMAT_ALAW:
2455                 pcm_format = SNDRV_PCM_FORMAT_A_LAW;
2456                 break;
2457         case USB_AUDIO_FORMAT_MU_LAW:
2458                 pcm_format = SNDRV_PCM_FORMAT_MU_LAW;
2459                 break;
2460         default:
2461                 snd_printk(KERN_INFO "%d:%u:%d : unsupported format type %d\n",
2462                            chip->dev->devnum, fp->iface, fp->altsetting, format);
2463                 break;
2464         }
2465         return pcm_format;
2466 }
2467
2468
2469 /*
2470  * parse the format descriptor and stores the possible sample rates
2471  * on the audioformat table.
2472  *
2473  * @dev: usb device
2474  * @fp: audioformat record
2475  * @fmt: the format descriptor
2476  * @offset: the start offset of descriptor pointing the rate type
2477  *          (7 for type I and II, 8 for type II)
2478  */
2479 static int parse_audio_format_rates(struct snd_usb_audio *chip, struct audioformat *fp,
2480                                     unsigned char *fmt, int offset)
2481 {
2482         int nr_rates = fmt[offset];
2483
2484         if (fmt[0] < offset + 1 + 3 * (nr_rates ? nr_rates : 2)) {
2485                 snd_printk(KERN_ERR "%d:%u:%d : invalid FORMAT_TYPE desc\n",
2486                                    chip->dev->devnum, fp->iface, fp->altsetting);
2487                 return -1;
2488         }
2489
2490         if (nr_rates) {
2491                 /*
2492                  * build the rate table and bitmap flags
2493                  */
2494                 int r, idx;
2495
2496                 fp->rate_table = kmalloc(sizeof(int) * nr_rates, GFP_KERNEL);
2497                 if (fp->rate_table == NULL) {
2498                         snd_printk(KERN_ERR "cannot malloc\n");
2499                         return -1;
2500                 }
2501
2502                 fp->nr_rates = 0;
2503                 fp->rate_min = fp->rate_max = 0;
2504                 for (r = 0, idx = offset + 1; r < nr_rates; r++, idx += 3) {
2505                         unsigned int rate = combine_triple(&fmt[idx]);
2506                         if (!rate)
2507                                 continue;
2508                         /* C-Media CM6501 mislabels its 96 kHz altsetting */
2509                         if (rate == 48000 && nr_rates == 1 &&
2510                             (chip->usb_id == USB_ID(0x0d8c, 0x0201) ||
2511                              chip->usb_id == USB_ID(0x0d8c, 0x0102)) &&
2512                             fp->altsetting == 5 && fp->maxpacksize == 392)
2513                                 rate = 96000;
2514                         fp->rate_table[fp->nr_rates] = rate;
2515                         if (!fp->rate_min || rate < fp->rate_min)
2516                                 fp->rate_min = rate;
2517                         if (!fp->rate_max || rate > fp->rate_max)
2518                                 fp->rate_max = rate;
2519                         fp->rates |= snd_pcm_rate_to_rate_bit(rate);
2520                         fp->nr_rates++;
2521                 }
2522                 if (!fp->nr_rates) {
2523                         hwc_debug("All rates were zero. Skipping format!\n");
2524                         return -1;
2525                 }
2526         } else {
2527                 /* continuous rates */
2528                 fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
2529                 fp->rate_min = combine_triple(&fmt[offset + 1]);
2530                 fp->rate_max = combine_triple(&fmt[offset + 4]);
2531         }
2532         return 0;
2533 }
2534
2535 /*
2536  * parse the format type I and III descriptors
2537  */
2538 static int parse_audio_format_i(struct snd_usb_audio *chip, struct audioformat *fp,
2539                                 int format, unsigned char *fmt)
2540 {
2541         int pcm_format;
2542
2543         if (fmt[3] == USB_FORMAT_TYPE_III) {
2544                 /* FIXME: the format type is really IECxxx
2545                  *        but we give normal PCM format to get the existing
2546                  *        apps working...
2547                  */
2548                 switch (chip->usb_id) {
2549
2550                 case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
2551                         if (device_setup[chip->index] == 0x00 && 
2552                             fp->altsetting == 6)
2553                                 pcm_format = SNDRV_PCM_FORMAT_S16_BE;
2554                         else
2555                                 pcm_format = SNDRV_PCM_FORMAT_S16_LE;
2556                         break;
2557                 default:
2558                         pcm_format = SNDRV_PCM_FORMAT_S16_LE;
2559                 }
2560         } else {
2561                 pcm_format = parse_audio_format_i_type(chip, fp, format, fmt);
2562                 if (pcm_format < 0)
2563                         return -1;
2564         }
2565         fp->format = pcm_format;
2566         fp->channels = fmt[4];
2567         if (fp->channels < 1) {
2568                 snd_printk(KERN_ERR "%d:%u:%d : invalid channels %d\n",
2569                            chip->dev->devnum, fp->iface, fp->altsetting, fp->channels);
2570                 return -1;
2571         }
2572         return parse_audio_format_rates(chip, fp, fmt, 7);
2573 }
2574
2575 /*
2576  * prase the format type II descriptor
2577  */
2578 static int parse_audio_format_ii(struct snd_usb_audio *chip, struct audioformat *fp,
2579                                  int format, unsigned char *fmt)
2580 {
2581         int brate, framesize;
2582         switch (format) {
2583         case USB_AUDIO_FORMAT_AC3:
2584                 /* FIXME: there is no AC3 format defined yet */
2585                 // fp->format = SNDRV_PCM_FORMAT_AC3;
2586                 fp->format = SNDRV_PCM_FORMAT_U8; /* temporarily hack to receive byte streams */
2587                 break;
2588         case USB_AUDIO_FORMAT_MPEG:
2589                 fp->format = SNDRV_PCM_FORMAT_MPEG;
2590                 break;
2591         default:
2592                 snd_printd(KERN_INFO "%d:%u:%d : unknown format tag %#x is detected.  processed as MPEG.\n",
2593                            chip->dev->devnum, fp->iface, fp->altsetting, format);
2594                 fp->format = SNDRV_PCM_FORMAT_MPEG;
2595                 break;
2596         }
2597         fp->channels = 1;
2598         brate = combine_word(&fmt[4]);  /* fmt[4,5] : wMaxBitRate (in kbps) */
2599         framesize = combine_word(&fmt[6]); /* fmt[6,7]: wSamplesPerFrame */
2600         snd_printd(KERN_INFO "found format II with max.bitrate = %d, frame size=%d\n", brate, framesize);
2601         fp->frame_size = framesize;
2602         return parse_audio_format_rates(chip, fp, fmt, 8); /* fmt[8..] sample rates */
2603 }
2604
2605 static int parse_audio_format(struct snd_usb_audio *chip, struct audioformat *fp,
2606                               int format, unsigned char *fmt, int stream)
2607 {
2608         int err;
2609
2610         switch (fmt[3]) {
2611         case USB_FORMAT_TYPE_I:
2612         case USB_FORMAT_TYPE_III:
2613                 err = parse_audio_format_i(chip, fp, format, fmt);
2614                 break;
2615         case USB_FORMAT_TYPE_II:
2616                 err = parse_audio_format_ii(chip, fp, format, fmt);
2617                 break;
2618         default:
2619                 snd_printd(KERN_INFO "%d:%u:%d : format type %d is not supported yet\n",
2620                            chip->dev->devnum, fp->iface, fp->altsetting, fmt[3]);
2621                 return -1;
2622         }
2623         fp->fmt_type = fmt[3];
2624         if (err < 0)
2625                 return err;
2626 #if 1
2627         /* FIXME: temporary hack for extigy/audigy 2 nx/zs */
2628         /* extigy apparently supports sample rates other than 48k
2629          * but not in ordinary way.  so we enable only 48k atm.
2630          */
2631         if (chip->usb_id == USB_ID(0x041e, 0x3000) ||
2632             chip->usb_id == USB_ID(0x041e, 0x3020) ||
2633             chip->usb_id == USB_ID(0x041e, 0x3061)) {
2634                 if (fmt[3] == USB_FORMAT_TYPE_I &&
2635                     fp->rates != SNDRV_PCM_RATE_48000 &&
2636                     fp->rates != SNDRV_PCM_RATE_96000)
2637                         return -1;
2638         }
2639 #endif
2640         return 0;
2641 }
2642
2643 static unsigned char parse_datainterval(struct snd_usb_audio *chip,
2644                                         struct usb_host_interface *alts)
2645 {
2646         if (snd_usb_get_speed(chip->dev) == USB_SPEED_HIGH &&
2647             get_endpoint(alts, 0)->bInterval >= 1 &&
2648             get_endpoint(alts, 0)->bInterval <= 4)
2649                 return get_endpoint(alts, 0)->bInterval - 1;
2650         else
2651                 return 0;
2652 }
2653
2654 static int audiophile_skip_setting_quirk(struct snd_usb_audio *chip,
2655                                          int iface, int altno);
2656 static int parse_audio_endpoints(struct snd_usb_audio *chip, int iface_no)
2657 {
2658         struct usb_device *dev;
2659         struct usb_interface *iface;
2660         struct usb_host_interface *alts;
2661         struct usb_interface_descriptor *altsd;
2662         int i, altno, err, stream;
2663         int format;
2664         struct audioformat *fp;
2665         unsigned char *fmt, *csep;
2666         int num;
2667
2668         dev = chip->dev;
2669
2670         /* parse the interface's altsettings */
2671         iface = usb_ifnum_to_if(dev, iface_no);
2672
2673         num = iface->num_altsetting;
2674
2675         /*
2676          * Dallas DS4201 workaround: It presents 5 altsettings, but the last
2677          * one misses syncpipe, and does not produce any sound.
2678          */
2679         if (chip->usb_id == USB_ID(0x04fa, 0x4201))
2680                 num = 4;
2681
2682         for (i = 0; i < num; i++) {
2683                 alts = &iface->altsetting[i];
2684                 altsd = get_iface_desc(alts);
2685                 /* skip invalid one */
2686                 if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
2687                      altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
2688                     (altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIO_STREAMING &&
2689                      altsd->bInterfaceSubClass != USB_SUBCLASS_VENDOR_SPEC) ||
2690                     altsd->bNumEndpoints < 1 ||
2691                     le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) == 0)
2692                         continue;
2693                 /* must be isochronous */
2694                 if ((get_endpoint(alts, 0)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
2695                     USB_ENDPOINT_XFER_ISOC)
2696                         continue;
2697                 /* check direction */
2698                 stream = (get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN) ?
2699                         SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
2700                 altno = altsd->bAlternateSetting;
2701         
2702                 /* audiophile usb: skip altsets incompatible with device_setup
2703                  */
2704                 if (chip->usb_id == USB_ID(0x0763, 0x2003) && 
2705                     audiophile_skip_setting_quirk(chip, iface_no, altno))
2706                         continue;
2707
2708                 /* get audio formats */
2709                 fmt = snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, AS_GENERAL);
2710                 if (!fmt) {
2711                         snd_printk(KERN_ERR "%d:%u:%d : AS_GENERAL descriptor not found\n",
2712                                    dev->devnum, iface_no, altno);
2713                         continue;
2714                 }
2715
2716                 if (fmt[0] < 7) {
2717                         snd_printk(KERN_ERR "%d:%u:%d : invalid AS_GENERAL desc\n",
2718                                    dev->devnum, iface_no, altno);
2719                         continue;
2720                 }
2721
2722                 format = (fmt[6] << 8) | fmt[5]; /* remember the format value */
2723
2724                 /* get format type */
2725                 fmt = snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, FORMAT_TYPE);
2726                 if (!fmt) {
2727                         snd_printk(KERN_ERR "%d:%u:%d : no FORMAT_TYPE desc\n",
2728                                    dev->devnum, iface_no, altno);
2729                         continue;
2730                 }
2731                 if (fmt[0] < 8) {
2732                         snd_printk(KERN_ERR "%d:%u:%d : invalid FORMAT_TYPE desc\n",
2733                                    dev->devnum, iface_no, altno);
2734                         continue;
2735                 }
2736
2737                 csep = snd_usb_find_desc(alts->endpoint[0].extra, alts->endpoint[0].extralen, NULL, USB_DT_CS_ENDPOINT);
2738                 /* Creamware Noah has this descriptor after the 2nd endpoint */
2739                 if (!csep && altsd->bNumEndpoints >= 2)
2740                         csep = snd_usb_find_desc(alts->endpoint[1].extra, alts->endpoint[1].extralen, NULL, USB_DT_CS_ENDPOINT);
2741                 if (!csep || csep[0] < 7 || csep[2] != EP_GENERAL) {
2742                         snd_printk(KERN_WARNING "%d:%u:%d : no or invalid"
2743                                    " class specific endpoint descriptor\n",
2744                                    dev->devnum, iface_no, altno);
2745                         csep = NULL;
2746                 }
2747
2748                 fp = kzalloc(sizeof(*fp), GFP_KERNEL);
2749                 if (! fp) {
2750                         snd_printk(KERN_ERR "cannot malloc\n");
2751                         return -ENOMEM;
2752                 }
2753
2754                 fp->iface = iface_no;
2755                 fp->altsetting = altno;
2756                 fp->altset_idx = i;
2757                 fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
2758                 fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
2759                 fp->datainterval = parse_datainterval(chip, alts);
2760                 fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
2761                 if (snd_usb_get_speed(dev) == USB_SPEED_HIGH)
2762                         fp->maxpacksize = (((fp->maxpacksize >> 11) & 3) + 1)
2763                                         * (fp->maxpacksize & 0x7ff);
2764                 fp->attributes = csep ? csep[3] : 0;
2765
2766                 /* some quirks for attributes here */
2767
2768                 switch (chip->usb_id) {
2769                 case USB_ID(0x0a92, 0x0053): /* AudioTrak Optoplay */
2770                         /* Optoplay sets the sample rate attribute although
2771                          * it seems not supporting it in fact.
2772                          */
2773                         fp->attributes &= ~EP_CS_ATTR_SAMPLE_RATE;
2774                         break;
2775                 case USB_ID(0x041e, 0x3020): /* Creative SB Audigy 2 NX */
2776                 case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
2777                         /* doesn't set the sample rate attribute, but supports it */
2778                         fp->attributes |= EP_CS_ATTR_SAMPLE_RATE;
2779                         break;
2780                 case USB_ID(0x047f, 0x0ca1): /* plantronics headset */
2781                 case USB_ID(0x077d, 0x07af): /* Griffin iMic (note that there is
2782                                                 an older model 77d:223) */
2783                 /*
2784                  * plantronics headset and Griffin iMic have set adaptive-in
2785                  * although it's really not...
2786                  */
2787                         fp->ep_attr &= ~EP_ATTR_MASK;
2788                         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
2789                                 fp->ep_attr |= EP_ATTR_ADAPTIVE;
2790                         else
2791                                 fp->ep_attr |= EP_ATTR_SYNC;
2792                         break;
2793                 }
2794
2795                 /* ok, let's parse further... */
2796                 if (parse_audio_format(chip, fp, format, fmt, stream) < 0) {
2797                         kfree(fp->rate_table);
2798                         kfree(fp);
2799                         continue;
2800                 }
2801
2802                 snd_printdd(KERN_INFO "%d:%u:%d: add audio endpoint %#x\n", dev->devnum, iface_no, altno, fp->endpoint);
2803                 err = add_audio_endpoint(chip, stream, fp);
2804                 if (err < 0) {
2805                         kfree(fp->rate_table);
2806                         kfree(fp);
2807                         return err;
2808                 }
2809                 /* try to set the interface... */
2810                 usb_set_interface(chip->dev, iface_no, altno);
2811                 init_usb_pitch(chip->dev, iface_no, alts, fp);
2812                 init_usb_sample_rate(chip->dev, iface_no, alts, fp, fp->rate_max);
2813         }
2814         return 0;
2815 }
2816
2817
2818 /*
2819  * disconnect streams
2820  * called from snd_usb_audio_disconnect()
2821  */
2822 static void snd_usb_stream_disconnect(struct list_head *head)
2823 {
2824         int idx;
2825         struct snd_usb_stream *as;
2826         struct snd_usb_substream *subs;
2827
2828         as = list_entry(head, struct snd_usb_stream, list);
2829         for (idx = 0; idx < 2; idx++) {
2830                 subs = &as->substream[idx];
2831                 if (!subs->num_formats)
2832                         return;
2833                 release_substream_urbs(subs, 1);
2834                 subs->interface = -1;
2835         }
2836 }
2837
2838 /*
2839  * parse audio control descriptor and create pcm/midi streams
2840  */
2841 static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif)
2842 {
2843         struct usb_device *dev = chip->dev;
2844         struct usb_host_interface *host_iface;
2845         struct usb_interface *iface;
2846         unsigned char *p1;
2847         int i, j;
2848
2849         /* find audiocontrol interface */
2850         host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0];
2851         if (!(p1 = snd_usb_find_csint_desc(host_iface->extra, host_iface->extralen, NULL, HEADER))) {
2852                 snd_printk(KERN_ERR "cannot find HEADER\n");
2853                 return -EINVAL;
2854         }
2855         if (! p1[7] || p1[0] < 8 + p1[7]) {
2856                 snd_printk(KERN_ERR "invalid HEADER\n");
2857                 return -EINVAL;
2858         }
2859
2860         /*
2861          * parse all USB audio streaming interfaces
2862          */
2863         for (i = 0; i < p1[7]; i++) {
2864                 struct usb_host_interface *alts;
2865                 struct usb_interface_descriptor *altsd;
2866                 j = p1[8 + i];
2867                 iface = usb_ifnum_to_if(dev, j);
2868                 if (!iface) {
2869                         snd_printk(KERN_ERR "%d:%u:%d : does not exist\n",
2870                                    dev->devnum, ctrlif, j);
2871                         continue;
2872                 }
2873                 if (usb_interface_claimed(iface)) {
2874                         snd_printdd(KERN_INFO "%d:%d:%d: skipping, already claimed\n", dev->devnum, ctrlif, j);
2875                         continue;
2876                 }
2877                 alts = &iface->altsetting[0];
2878                 altsd = get_iface_desc(alts);
2879                 if ((altsd->bInterfaceClass == USB_CLASS_AUDIO ||
2880                      altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC) &&
2881                     altsd->bInterfaceSubClass == USB_SUBCLASS_MIDI_STREAMING) {
2882                         if (snd_usb_create_midi_interface(chip, iface, NULL) < 0) {
2883                                 snd_printk(KERN_ERR "%d:%u:%d: cannot create sequencer device\n", dev->devnum, ctrlif, j);
2884                                 continue;
2885                         }
2886                         usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
2887                         continue;
2888                 }
2889                 if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
2890                      altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
2891                     altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIO_STREAMING) {
2892                         snd_printdd(KERN_ERR "%d:%u:%d: skipping non-supported interface %d\n", dev->devnum, ctrlif, j, altsd->bInterfaceClass);
2893                         /* skip non-supported classes */
2894                         continue;
2895                 }
2896                 if (snd_usb_get_speed(dev) == USB_SPEED_LOW) {
2897                         snd_printk(KERN_ERR "low speed audio streaming not supported\n");
2898                         continue;
2899                 }
2900                 if (! parse_audio_endpoints(chip, j)) {
2901                         usb_set_interface(dev, j, 0); /* reset the current interface */
2902                         usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
2903                 }
2904         }
2905
2906         return 0;
2907 }
2908
2909 /*
2910  * create a stream for an endpoint/altsetting without proper descriptors
2911  */
2912 static int create_fixed_stream_quirk(struct snd_usb_audio *chip,
2913                                      struct usb_interface *iface,
2914                                      const struct snd_usb_audio_quirk *quirk)
2915 {
2916         struct audioformat *fp;
2917         struct usb_host_interface *alts;
2918         int stream, err;
2919         unsigned *rate_table = NULL;
2920
2921         fp = kmemdup(quirk->data, sizeof(*fp), GFP_KERNEL);
2922         if (! fp) {
2923                 snd_printk(KERN_ERR "cannot memdup\n");
2924                 return -ENOMEM;
2925         }
2926         if (fp->nr_rates > 0) {
2927                 rate_table = kmalloc(sizeof(int) * fp->nr_rates, GFP_KERNEL);
2928                 if (!rate_table) {
2929                         kfree(fp);
2930                         return -ENOMEM;
2931                 }
2932                 memcpy(rate_table, fp->rate_table, sizeof(int) * fp->nr_rates);
2933                 fp->rate_table = rate_table;
2934         }
2935
2936         stream = (fp->endpoint & USB_DIR_IN)
2937                 ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
2938         err = add_audio_endpoint(chip, stream, fp);
2939         if (err < 0) {
2940                 kfree(fp);
2941                 kfree(rate_table);
2942                 return err;
2943         }
2944         if (fp->iface != get_iface_desc(&iface->altsetting[0])->bInterfaceNumber ||
2945             fp->altset_idx >= iface->num_altsetting) {
2946                 kfree(fp);
2947                 kfree(rate_table);
2948                 return -EINVAL;
2949         }
2950         alts = &iface->altsetting[fp->altset_idx];
2951         fp->datainterval = parse_datainterval(chip, alts);
2952         fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
2953         usb_set_interface(chip->dev, fp->iface, 0);
2954         init_usb_pitch(chip->dev, fp->iface, alts, fp);
2955         init_usb_sample_rate(chip->dev, fp->iface, alts, fp, fp->rate_max);
2956         return 0;
2957 }
2958
2959 /*
2960  * create a stream for an interface with proper descriptors
2961  */
2962 static int create_standard_audio_quirk(struct snd_usb_audio *chip,
2963                                        struct usb_interface *iface,
2964                                        const struct snd_usb_audio_quirk *quirk)
2965 {
2966         struct usb_host_interface *alts;
2967         struct usb_interface_descriptor *altsd;
2968         int err;
2969
2970         alts = &iface->altsetting[0];
2971         altsd = get_iface_desc(alts);
2972         err = parse_audio_endpoints(chip, altsd->bInterfaceNumber);
2973         if (err < 0) {
2974                 snd_printk(KERN_ERR "cannot setup if %d: error %d\n",
2975                            altsd->bInterfaceNumber, err);
2976                 return err;
2977         }
2978         /* reset the current interface */
2979         usb_set_interface(chip->dev, altsd->bInterfaceNumber, 0);
2980         return 0;
2981 }
2982
2983 /*
2984  * Create a stream for an Edirol UA-700/UA-25/UA-4FX interface.  
2985  * The only way to detect the sample rate is by looking at wMaxPacketSize.
2986  */
2987 static int create_uaxx_quirk(struct snd_usb_audio *chip,
2988                               struct usb_interface *iface,
2989                               const struct snd_usb_audio_quirk *quirk)
2990 {
2991         static const struct audioformat ua_format = {
2992                 .format = SNDRV_PCM_FORMAT_S24_3LE,
2993                 .channels = 2,
2994                 .fmt_type = USB_FORMAT_TYPE_I,
2995                 .altsetting = 1,
2996                 .altset_idx = 1,
2997                 .rates = SNDRV_PCM_RATE_CONTINUOUS,
2998         };
2999         struct usb_host_interface *alts;
3000         struct usb_interface_descriptor *altsd;
3001         struct audioformat *fp;
3002         int stream, err;
3003
3004         /* both PCM and MIDI interfaces have 2 or more altsettings */
3005         if (iface->num_altsetting < 2)
3006                 return -ENXIO;
3007         alts = &iface->altsetting[1];
3008         altsd = get_iface_desc(alts);
3009
3010         if (altsd->bNumEndpoints == 2) {
3011                 static const struct snd_usb_midi_endpoint_info ua700_ep = {
3012                         .out_cables = 0x0003,
3013                         .in_cables  = 0x0003
3014                 };
3015                 static const struct snd_usb_audio_quirk ua700_quirk = {
3016                         .type = QUIRK_MIDI_FIXED_ENDPOINT,
3017                         .data = &ua700_ep
3018                 };
3019                 static const struct snd_usb_midi_endpoint_info uaxx_ep = {
3020                         .out_cables = 0x0001,
3021                         .in_cables  = 0x0001
3022                 };
3023                 static const struct snd_usb_audio_quirk uaxx_quirk = {
3024                         .type = QUIRK_MIDI_FIXED_ENDPOINT,
3025                         .data = &uaxx_ep
3026                 };
3027                 if (chip->usb_id == USB_ID(0x0582, 0x002b))
3028                         return snd_usb_create_midi_interface(chip, iface,
3029                                                              &ua700_quirk);
3030                 else
3031                         return snd_usb_create_midi_interface(chip, iface,
3032                                                              &uaxx_quirk);
3033         }
3034
3035         if (altsd->bNumEndpoints != 1)
3036                 return -ENXIO;
3037
3038         fp = kmalloc(sizeof(*fp), GFP_KERNEL);
3039         if (!fp)
3040                 return -ENOMEM;
3041         memcpy(fp, &ua_format, sizeof(*fp));
3042
3043         fp->iface = altsd->bInterfaceNumber;
3044         fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
3045         fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
3046         fp->datainterval = 0;
3047         fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
3048
3049         switch (fp->maxpacksize) {
3050         case 0x120:
3051                 fp->rate_max = fp->rate_min = 44100;
3052                 break;
3053         case 0x138:
3054         case 0x140:
3055                 fp->rate_max = fp->rate_min = 48000;
3056                 break;
3057         case 0x258:
3058         case 0x260:
3059                 fp->rate_max = fp->rate_min = 96000;
3060                 break;
3061         default:
3062                 snd_printk(KERN_ERR "unknown sample rate\n");
3063                 kfree(fp);
3064                 return -ENXIO;
3065         }
3066
3067         stream = (fp->endpoint & USB_DIR_IN)
3068                 ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
3069         err = add_audio_endpoint(chip, stream, fp);
3070         if (err < 0) {
3071                 kfree(fp);
3072                 return err;
3073         }
3074         usb_set_interface(chip->dev, fp->iface, 0);
3075         return 0;
3076 }
3077
3078 /*
3079  * Create a stream for an Edirol UA-1000 interface.
3080  */
3081 static int create_ua1000_quirk(struct snd_usb_audio *chip,
3082                                struct usb_interface *iface,
3083                                const struct snd_usb_audio_quirk *quirk)
3084 {
3085         static const struct audioformat ua1000_format = {
3086                 .format = SNDRV_PCM_FORMAT_S32_LE,
3087                 .fmt_type = USB_FORMAT_TYPE_I,
3088                 .altsetting = 1,
3089                 .altset_idx = 1,
3090                 .attributes = 0,
3091                 .rates = SNDRV_PCM_RATE_CONTINUOUS,
3092         };
3093         struct usb_host_interface *alts;
3094         struct usb_interface_descriptor *altsd;
3095         struct audioformat *fp;
3096         int stream, err;
3097
3098         if (iface->num_altsetting != 2)
3099                 return -ENXIO;
3100         alts = &iface->altsetting[1];
3101         altsd = get_iface_desc(alts);
3102         if (alts->extralen != 11 || alts->extra[1] != USB_DT_CS_INTERFACE ||
3103             altsd->bNumEndpoints != 1)
3104                 return -ENXIO;
3105
3106         fp = kmemdup(&ua1000_format, sizeof(*fp), GFP_KERNEL);
3107         if (!fp)
3108                 return -ENOMEM;
3109
3110         fp->channels = alts->extra[4];
3111         fp->iface = altsd->bInterfaceNumber;
3112         fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
3113         fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
3114         fp->datainterval = parse_datainterval(chip, alts);
3115         fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
3116         fp->rate_max = fp->rate_min = combine_triple(&alts->extra[8]);
3117
3118         stream = (fp->endpoint & USB_DIR_IN)
3119                 ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
3120         err = add_audio_endpoint(chip, stream, fp);
3121         if (err < 0) {
3122                 kfree(fp);<