sound/usb/mixer.c

   1 /*
   2  *   (Tentative) USB Audio Driver for ALSA
   3  *
   4  *   Mixer control 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
  29 /*
  30  * TODOs, for both the mixer and the streaming interfaces:
  31  *
  32  *  - support for UAC2 effect units
  33  *  - support for graphical equalizers
  34  *  - RANGE and MEM set commands (UAC2)
  35  *  - RANGE and MEM interrupt dispatchers (UAC2)
  36  *  - audio channel clustering (UAC2)
  37  *  - audio sample rate converter units (UAC2)
  38  *  - proper handling of clock multipliers (UAC2)
  39  *  - dispatch clock change notifications (UAC2)
  40  *      - stop PCM streams which use a clock that became invalid
  41  *      - stop PCM streams which use a clock selector that has changed
  42  *      - parse available sample rates again when clock sources changed
  43  */
  44
  45 #include <linux/bitops.h>
  46 #include <linux/init.h>
  47 #include <linux/list.h>
  48 #include <linux/log2.h>
  49 #include <linux/slab.h>
  50 #include <linux/string.h>
  51 #include <linux/usb.h>
  52 #include <linux/usb/audio.h>
  53 #include <linux/usb/audio-v2.h>
  54 #include <linux/usb/audio-v3.h>
  55
  56 #include <sound/core.h>
  57 #include <sound/control.h>
  58 #include <sound/hwdep.h>
  59 #include <sound/info.h>
  60 #include <sound/tlv.h>
  61
  62 #include "usbaudio.h"
  63 #include "mixer.h"
  64 #include "helper.h"
  65 #include "mixer_quirks.h"
  66 #include "power.h"
  67
  68 #define MAX_ID_ELEMS    256
  69
  70 struct usb_audio_term {
  71         int id;
  72         int type;
  73         int channels;
  74         unsigned int chconfig;
  75         int name;
  76 };
  77
  78 struct usbmix_name_map;
  79
  80 struct mixer_build {
  81         struct snd_usb_audio *chip;
  82         struct usb_mixer_interface *mixer;
  83         unsigned char *buffer;
  84         unsigned int buflen;
  85         DECLARE_BITMAP(unitbitmap, MAX_ID_ELEMS);
  86         struct usb_audio_term oterm;
  87         const struct usbmix_name_map *map;
  88         const struct usbmix_selector_map *selector_map;
  89 };
  90
  91 /*E-mu 0202/0404/0204 eXtension Unit(XU) control*/
  92 enum {
  93         USB_XU_CLOCK_RATE               = 0xe301,
  94         USB_XU_CLOCK_SOURCE             = 0xe302,
  95         USB_XU_DIGITAL_IO_STATUS        = 0xe303,
  96         USB_XU_DEVICE_OPTIONS           = 0xe304,
  97         USB_XU_DIRECT_MONITORING        = 0xe305,
  98         USB_XU_METERING                 = 0xe306
  99 };
 100 enum {
 101         USB_XU_CLOCK_SOURCE_SELECTOR = 0x02,    /* clock source*/
 102         USB_XU_CLOCK_RATE_SELECTOR = 0x03,      /* clock rate */
 103         USB_XU_DIGITAL_FORMAT_SELECTOR = 0x01,  /* the spdif format */
 104         USB_XU_SOFT_LIMIT_SELECTOR = 0x03       /* soft limiter */
 105 };
 106
 107 /*
 108  * manual mapping of mixer names
 109  * if the mixer topology is too complicated and the parsed names are
 110  * ambiguous, add the entries in usbmixer_maps.c.
 111  */
 112 #include "mixer_maps.c"
 113
 114 static const struct usbmix_name_map *
 115 find_map(const struct usbmix_name_map *p, int unitid, int control)
 116 {
 117         if (!p)
 118                 return NULL;
 119
 120         for (; p->id; p++) {
 121                 if (p->id == unitid &&
 122                     (!control || !p->control || control == p->control))
 123                         return p;
 124         }
 125         return NULL;
 126 }
 127
 128 /* get the mapped name if the unit matches */
 129 static int
 130 check_mapped_name(const struct usbmix_name_map *p, char *buf, int buflen)
 131 {
 132         if (!p || !p->name)
 133                 return 0;
 134
 135         buflen--;
 136         return strlcpy(buf, p->name, buflen);
 137 }
 138
 139 /* ignore the error value if ignore_ctl_error flag is set */
 140 #define filter_error(cval, err) \
 141         ((cval)->head.mixer->ignore_ctl_error ? 0 : (err))
 142
 143 /* check whether the control should be ignored */
 144 static inline int
 145 check_ignored_ctl(const struct usbmix_name_map *p)
 146 {
 147         if (!p || p->name || p->dB)
 148                 return 0;
 149         return 1;
 150 }
 151
 152 /* dB mapping */
 153 static inline void check_mapped_dB(const struct usbmix_name_map *p,
 154                                    struct usb_mixer_elem_info *cval)
 155 {
 156         if (p && p->dB) {
 157                 cval->dBmin = p->dB->min;
 158                 cval->dBmax = p->dB->max;
 159                 cval->initialized = 1;
 160         }
 161 }
 162
 163 /* get the mapped selector source name */
 164 static int check_mapped_selector_name(struct mixer_build *state, int unitid,
 165                                       int index, char *buf, int buflen)
 166 {
 167         const struct usbmix_selector_map *p;
 168
 169         if (!state->selector_map)
 170                 return 0;
 171         for (p = state->selector_map; p->id; p++) {
 172                 if (p->id == unitid && index < p->count)
 173                         return strlcpy(buf, p->names[index], buflen);
 174         }
 175         return 0;
 176 }
 177
 178 /*
 179  * find an audio control unit with the given unit id
 180  */
 181 static void *find_audio_control_unit(struct mixer_build *state,
 182                                      unsigned char unit)
 183 {
 184         /* we just parse the header */
 185         struct uac_feature_unit_descriptor *hdr = NULL;
 186
 187         while ((hdr = snd_usb_find_desc(state->buffer, state->buflen, hdr,
 188                                         USB_DT_CS_INTERFACE)) != NULL) {
 189                 if (hdr->bLength >= 4 &&
 190                     hdr->bDescriptorSubtype >= UAC_INPUT_TERMINAL &&
 191                     hdr->bDescriptorSubtype <= UAC3_SAMPLE_RATE_CONVERTER &&
 192                     hdr->bUnitID == unit)
 193                         return hdr;
 194         }
 195
 196         return NULL;
 197 }
 198
 199 /*
 200  * copy a string with the given id
 201  */
 202 static int snd_usb_copy_string_desc(struct snd_usb_audio *chip,
 203                                     int index, char *buf, int maxlen)
 204 {
 205         int len = usb_string(chip->dev, index, buf, maxlen - 1);
 206
 207         if (len < 0)
 208                 return 0;
 209
 210         buf[len] = 0;
 211         return len;
 212 }
 213
 214 /*
 215  * convert from the byte/word on usb descriptor to the zero-based integer
 216  */
 217 static int convert_signed_value(struct usb_mixer_elem_info *cval, int val)
 218 {
 219         switch (cval->val_type) {
 220         case USB_MIXER_BOOLEAN:
 221                 return !!val;
 222         case USB_MIXER_INV_BOOLEAN:
 223                 return !val;
 224         case USB_MIXER_U8:
 225                 val &= 0xff;
 226                 break;
 227         case USB_MIXER_S8:
 228                 val &= 0xff;
 229                 if (val >= 0x80)
 230                         val -= 0x100;
 231                 break;
 232         case USB_MIXER_U16:
 233                 val &= 0xffff;
 234                 break;
 235         case USB_MIXER_S16:
 236                 val &= 0xffff;
 237                 if (val >= 0x8000)
 238                         val -= 0x10000;
 239                 break;
 240         }
 241         return val;
 242 }
 243
 244 /*
 245  * convert from the zero-based int to the byte/word for usb descriptor
 246  */
 247 static int convert_bytes_value(struct usb_mixer_elem_info *cval, int val)
 248 {
 249         switch (cval->val_type) {
 250         case USB_MIXER_BOOLEAN:
 251                 return !!val;
 252         case USB_MIXER_INV_BOOLEAN:
 253                 return !val;
 254         case USB_MIXER_S8:
 255         case USB_MIXER_U8:
 256                 return val & 0xff;
 257         case USB_MIXER_S16:
 258         case USB_MIXER_U16:
 259                 return val & 0xffff;
 260         }
 261         return 0; /* not reached */
 262 }
 263
 264 static int get_relative_value(struct usb_mixer_elem_info *cval, int val)
 265 {
 266         if (!cval->res)
 267                 cval->res = 1;
 268         if (val < cval->min)
 269                 return 0;
 270         else if (val >= cval->max)
 271                 return (cval->max - cval->min + cval->res - 1) / cval->res;
 272         else
 273                 return (val - cval->min) / cval->res;
 274 }
 275
 276 static int get_abs_value(struct usb_mixer_elem_info *cval, int val)
 277 {
 278         if (val < 0)
 279                 return cval->min;
 280         if (!cval->res)
 281                 cval->res = 1;
 282         val *= cval->res;
 283         val += cval->min;
 284         if (val > cval->max)
 285                 return cval->max;
 286         return val;
 287 }
 288
 289 static int uac2_ctl_value_size(int val_type)
 290 {
 291         switch (val_type) {
 292         case USB_MIXER_S32:
 293         case USB_MIXER_U32:
 294                 return 4;
 295         case USB_MIXER_S16:
 296         case USB_MIXER_U16:
 297                 return 2;
 298         default:
 299                 return 1;
 300         }
 301         return 0; /* unreachable */
 302 }
 303
 304
 305 /*
 306  * retrieve a mixer value
 307  */
 308
 309 static int get_ctl_value_v1(struct usb_mixer_elem_info *cval, int request,
 310                             int validx, int *value_ret)
 311 {
 312         struct snd_usb_audio *chip = cval->head.mixer->chip;
 313         unsigned char buf[2];
 314         int val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
 315         int timeout = 10;
 316         int idx = 0, err;
 317
 318         err = snd_usb_lock_shutdown(chip);
 319         if (err < 0)
 320                 return -EIO;
 321
 322         while (timeout-- > 0) {
 323                 idx = snd_usb_ctrl_intf(chip) | (cval->head.id << 8);
 324                 err = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), request,
 325                                       USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
 326                                       validx, idx, buf, val_len);
 327                 if (err >= val_len) {
 328                         *value_ret = convert_signed_value(cval, snd_usb_combine_bytes(buf, val_len));
 329                         err = 0;
 330                         goto out;
 331                 } else if (err == -ETIMEDOUT) {
 332                         goto out;
 333                 }
 334         }
 335         usb_audio_dbg(chip,
 336                 "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
 337                 request, validx, idx, cval->val_type);
 338         err = -EINVAL;
 339
 340  out:
 341         snd_usb_unlock_shutdown(chip);
 342         return err;
 343 }
 344
 345 static int get_ctl_value_v2(struct usb_mixer_elem_info *cval, int request,
 346                             int validx, int *value_ret)
 347 {
 348         struct snd_usb_audio *chip = cval->head.mixer->chip;
 349         /* enough space for one range */
 350         unsigned char buf[sizeof(__u16) + 3 * sizeof(__u32)];
 351         unsigned char *val;
 352         int idx = 0, ret, val_size, size;
 353         __u8 bRequest;
 354
 355         val_size = uac2_ctl_value_size(cval->val_type);
 356
 357         if (request == UAC_GET_CUR) {
 358                 bRequest = UAC2_CS_CUR;
 359                 size = val_size;
 360         } else {
 361                 bRequest = UAC2_CS_RANGE;
 362                 size = sizeof(__u16) + 3 * val_size;
 363         }
 364
 365         memset(buf, 0, sizeof(buf));
 366
 367         ret = snd_usb_lock_shutdown(chip) ? -EIO : 0;
 368         if (ret)
 369                 goto error;
 370
 371         idx = snd_usb_ctrl_intf(chip) | (cval->head.id << 8);
 372         ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), bRequest,
 373                               USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
 374                               validx, idx, buf, size);
 375         snd_usb_unlock_shutdown(chip);
 376
 377         if (ret < 0) {
 378 error:
 379                 usb_audio_err(chip,
 380                         "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
 381                         request, validx, idx, cval->val_type);
 382                 return ret;
 383         }
 384
 385         /* FIXME: how should we handle multiple triplets here? */
 386
 387         switch (request) {
 388         case UAC_GET_CUR:
 389                 val = buf;
 390                 break;
 391         case UAC_GET_MIN:
 392                 val = buf + sizeof(__u16);
 393                 break;
 394         case UAC_GET_MAX:
 395                 val = buf + sizeof(__u16) + val_size;
 396                 break;
 397         case UAC_GET_RES:
 398                 val = buf + sizeof(__u16) + val_size * 2;
 399                 break;
 400         default:
 401                 return -EINVAL;
 402         }
 403
 404         *value_ret = convert_signed_value(cval,
 405                                           snd_usb_combine_bytes(val, val_size));
 406
 407         return 0;
 408 }
 409
 410 static int get_ctl_value(struct usb_mixer_elem_info *cval, int request,
 411                          int validx, int *value_ret)
 412 {
 413         validx += cval->idx_off;
 414
 415         return (cval->head.mixer->protocol == UAC_VERSION_1) ?
 416                 get_ctl_value_v1(cval, request, validx, value_ret) :
 417                 get_ctl_value_v2(cval, request, validx, value_ret);
 418 }
 419
 420 static int get_cur_ctl_value(struct usb_mixer_elem_info *cval,
 421                              int validx, int *value)
 422 {
 423         return get_ctl_value(cval, UAC_GET_CUR, validx, value);
 424 }
 425
 426 /* channel = 0: master, 1 = first channel */
 427 static inline int get_cur_mix_raw(struct usb_mixer_elem_info *cval,
 428                                   int channel, int *value)
 429 {
 430         return get_ctl_value(cval, UAC_GET_CUR,
 431                              (cval->control << 8) | channel,
 432                              value);
 433 }
 434
 435 int snd_usb_get_cur_mix_value(struct usb_mixer_elem_info *cval,
 436                              int channel, int index, int *value)
 437 {
 438         int err;
 439
 440         if (cval->cached & (1 << channel)) {
 441                 *value = cval->cache_val[index];
 442                 return 0;
 443         }
 444         err = get_cur_mix_raw(cval, channel, value);
 445         if (err < 0) {
 446                 if (!cval->head.mixer->ignore_ctl_error)
 447                         usb_audio_dbg(cval->head.mixer->chip,
 448                                 "cannot get current value for control %d ch %d: err = %d\n",
 449                                       cval->control, channel, err);
 450                 return err;
 451         }
 452         cval->cached |= 1 << channel;
 453         cval->cache_val[index] = *value;
 454         return 0;
 455 }
 456
 457 /*
 458  * set a mixer value
 459  */
 460
 461 int snd_usb_mixer_set_ctl_value(struct usb_mixer_elem_info *cval,
 462                                 int request, int validx, int value_set)
 463 {
 464         struct snd_usb_audio *chip = cval->head.mixer->chip;
 465         unsigned char buf[4];
 466         int idx = 0, val_len, err, timeout = 10;
 467
 468         validx += cval->idx_off;
 469
 470
 471         if (cval->head.mixer->protocol == UAC_VERSION_1) {
 472                 val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
 473         } else { /* UAC_VERSION_2/3 */
 474                 val_len = uac2_ctl_value_size(cval->val_type);
 475
 476                 /* FIXME */
 477                 if (request != UAC_SET_CUR) {
 478                         usb_audio_dbg(chip, "RANGE setting not yet supported\n");
 479                         return -EINVAL;
 480                 }
 481
 482                 request = UAC2_CS_CUR;
 483         }
 484
 485         value_set = convert_bytes_value(cval, value_set);
 486         buf[0] = value_set & 0xff;
 487         buf[1] = (value_set >> 8) & 0xff;
 488         buf[2] = (value_set >> 16) & 0xff;
 489         buf[3] = (value_set >> 24) & 0xff;
 490
 491         err = snd_usb_lock_shutdown(chip);
 492         if (err < 0)
 493                 return -EIO;
 494
 495         while (timeout-- > 0) {
 496                 idx = snd_usb_ctrl_intf(chip) | (cval->head.id << 8);
 497                 err = snd_usb_ctl_msg(chip->dev,
 498                                       usb_sndctrlpipe(chip->dev, 0), request,
 499                                       USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
 500                                       validx, idx, buf, val_len);
 501                 if (err >= 0) {
 502                         err = 0;
 503                         goto out;
 504                 } else if (err == -ETIMEDOUT) {
 505                         goto out;
 506                 }
 507         }
 508         usb_audio_dbg(chip, "cannot set ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d, data = %#x/%#x\n",
 509                       request, validx, idx, cval->val_type, buf[0], buf[1]);
 510         err = -EINVAL;
 511
 512  out:
 513         snd_usb_unlock_shutdown(chip);
 514         return err;
 515 }
 516
 517 static int set_cur_ctl_value(struct usb_mixer_elem_info *cval,
 518                              int validx, int value)
 519 {
 520         return snd_usb_mixer_set_ctl_value(cval, UAC_SET_CUR, validx, value);
 521 }
 522
 523 int snd_usb_set_cur_mix_value(struct usb_mixer_elem_info *cval, int channel,
 524                              int index, int value)
 525 {
 526         int err;
 527         unsigned int read_only = (channel == 0) ?
 528                 cval->master_readonly :
 529                 cval->ch_readonly & (1 << (channel - 1));
 530
 531         if (read_only) {
 532                 usb_audio_dbg(cval->head.mixer->chip,
 533                               "%s(): channel %d of control %d is read_only\n",
 534                             __func__, channel, cval->control);
 535                 return 0;
 536         }
 537
 538         err = snd_usb_mixer_set_ctl_value(cval,
 539                                           UAC_SET_CUR, (cval->control << 8) | channel,
 540                                           value);
 541         if (err < 0)
 542                 return err;
 543         cval->cached |= 1 << channel;
 544         cval->cache_val[index] = value;
 545         return 0;
 546 }
 547
 548 /*
 549  * TLV callback for mixer volume controls
 550  */
 551 int snd_usb_mixer_vol_tlv(struct snd_kcontrol *kcontrol, int op_flag,
 552                          unsigned int size, unsigned int __user *_tlv)
 553 {
 554         struct usb_mixer_elem_info *cval = kcontrol->private_data;
 555         DECLARE_TLV_DB_MINMAX(scale, 0, 0);
 556
 557         if (size < sizeof(scale))
 558                 return -ENOMEM;
 559         if (cval->min_mute)
 560                 scale[0] = SNDRV_CTL_TLVT_DB_MINMAX_MUTE;
 561         scale[2] = cval->dBmin;
 562         scale[3] = cval->dBmax;
 563         if (copy_to_user(_tlv, scale, sizeof(scale)))
 564                 return -EFAULT;
 565         return 0;
 566 }
 567
 568 /*
 569  * parser routines begin here...
 570  */
 571
 572 static int parse_audio_unit(struct mixer_build *state, int unitid);
 573
 574
 575 /*
 576  * check if the input/output channel routing is enabled on the given bitmap.
 577  * used for mixer unit parser
 578  */
 579 static int check_matrix_bitmap(unsigned char *bmap,
 580                                int ich, int och, int num_outs)
 581 {
 582         int idx = ich * num_outs + och;
 583         return bmap[idx >> 3] & (0x80 >> (idx & 7));
 584 }
 585
 586 /*
 587  * add an alsa control element
 588  * search and increment the index until an empty slot is found.
 589  *
 590  * if failed, give up and free the control instance.
 591  */
 592
 593 int snd_usb_mixer_add_control(struct usb_mixer_elem_list *list,
 594                               struct snd_kcontrol *kctl)
 595 {
 596         struct usb_mixer_interface *mixer = list->mixer;
 597         int err;
 598
 599         while (snd_ctl_find_id(mixer->chip->card, &kctl->id))
 600                 kctl->id.index++;
 601         err = snd_ctl_add(mixer->chip->card, kctl);
 602         if (err < 0) {
 603                 usb_audio_dbg(mixer->chip, "cannot add control (err = %d)\n",
 604                               err);
 605                 return err;
 606         }
 607         list->kctl = kctl;
 608         list->next_id_elem = mixer->id_elems[list->id];
 609         mixer->id_elems[list->id] = list;
 610         return 0;
 611 }
 612
 613 /*
 614  * get a terminal name string
 615  */
 616
 617 static struct iterm_name_combo {
 618         int type;
 619         char *name;
 620 } iterm_names[] = {
 621         { 0x0300, "Output" },
 622         { 0x0301, "Speaker" },
 623         { 0x0302, "Headphone" },
 624         { 0x0303, "HMD Audio" },
 625         { 0x0304, "Desktop Speaker" },
 626         { 0x0305, "Room Speaker" },
 627         { 0x0306, "Com Speaker" },
 628         { 0x0307, "LFE" },
 629         { 0x0600, "External In" },
 630         { 0x0601, "Analog In" },
 631         { 0x0602, "Digital In" },
 632         { 0x0603, "Line" },
 633         { 0x0604, "Legacy In" },
 634         { 0x0605, "IEC958 In" },
 635         { 0x0606, "1394 DA Stream" },
 636         { 0x0607, "1394 DV Stream" },
 637         { 0x0700, "Embedded" },
 638         { 0x0701, "Noise Source" },
 639         { 0x0702, "Equalization Noise" },
 640         { 0x0703, "CD" },
 641         { 0x0704, "DAT" },
 642         { 0x0705, "DCC" },
 643         { 0x0706, "MiniDisk" },
 644         { 0x0707, "Analog Tape" },
 645         { 0x0708, "Phonograph" },
 646         { 0x0709, "VCR Audio" },
 647         { 0x070a, "Video Disk Audio" },
 648         { 0x070b, "DVD Audio" },
 649         { 0x070c, "TV Tuner Audio" },
 650         { 0x070d, "Satellite Rec Audio" },
 651         { 0x070e, "Cable Tuner Audio" },
 652         { 0x070f, "DSS Audio" },
 653         { 0x0710, "Radio Receiver" },
 654         { 0x0711, "Radio Transmitter" },
 655         { 0x0712, "Multi-Track Recorder" },
 656         { 0x0713, "Synthesizer" },
 657         { 0 },
 658 };
 659
 660 static int get_term_name(struct snd_usb_audio *chip, struct usb_audio_term *iterm,
 661                          unsigned char *name, int maxlen, int term_only)
 662 {
 663         struct iterm_name_combo *names;
 664         int len;
 665
 666         if (iterm->name) {
 667                 len = snd_usb_copy_string_desc(chip, iterm->name,
 668                                                 name, maxlen);
 669                 if (len)
 670                         return len;
 671         }
 672
 673         /* virtual type - not a real terminal */
 674         if (iterm->type >> 16) {
 675                 if (term_only)
 676                         return 0;
 677                 switch (iterm->type >> 16) {
 678                 case UAC_SELECTOR_UNIT:
 679                         strcpy(name, "Selector");
 680                         return 8;
 681                 case UAC1_PROCESSING_UNIT:
 682                         strcpy(name, "Process Unit");
 683                         return 12;
 684                 case UAC1_EXTENSION_UNIT:
 685                         strcpy(name, "Ext Unit");
 686                         return 8;
 687                 case UAC_MIXER_UNIT:
 688                         strcpy(name, "Mixer");
 689                         return 5;
 690                 default:
 691                         return sprintf(name, "Unit %d", iterm->id);
 692                 }
 693         }
 694
 695         switch (iterm->type & 0xff00) {
 696         case 0x0100:
 697                 strcpy(name, "PCM");
 698                 return 3;
 699         case 0x0200:
 700                 strcpy(name, "Mic");
 701                 return 3;
 702         case 0x0400:
 703                 strcpy(name, "Headset");
 704                 return 7;
 705         case 0x0500:
 706                 strcpy(name, "Phone");
 707                 return 5;
 708         }
 709
 710         for (names = iterm_names; names->type; names++) {
 711                 if (names->type == iterm->type) {
 712                         strcpy(name, names->name);
 713                         return strlen(names->name);
 714                 }
 715         }
 716
 717         return 0;
 718 }
 719
 720 /*
 721  * Get logical cluster information for UAC3 devices.
 722  */
 723 static int get_cluster_channels_v3(struct mixer_build *state, unsigned int cluster_id)
 724 {
 725         struct uac3_cluster_header_descriptor c_header;
 726         int err;
 727
 728         err = snd_usb_ctl_msg(state->chip->dev,
 729                         usb_rcvctrlpipe(state->chip->dev, 0),
 730                         UAC3_CS_REQ_HIGH_CAPABILITY_DESCRIPTOR,
 731                         USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
 732                         cluster_id,
 733                         snd_usb_ctrl_intf(state->chip),
 734                         &c_header, sizeof(c_header));
 735         if (err < 0)
 736                 goto error;
 737         if (err != sizeof(c_header)) {
 738                 err = -EIO;
 739                 goto error;
 740         }
 741
 742         return c_header.bNrChannels;
 743
 744 error:
 745         usb_audio_err(state->chip, "cannot request logical cluster ID: %d (err: %d)\n", cluster_id, err);
 746         return err;
 747 }
 748
 749 /*
 750  * Get number of channels for a Mixer Unit.
 751  */
 752 static int uac_mixer_unit_get_channels(struct mixer_build *state,
 753                                        struct uac_mixer_unit_descriptor *desc)
 754 {
 755         int mu_channels;
 756
 757         if (desc->bLength < 11)
 758                 return -EINVAL;
 759         if (!desc->bNrInPins)
 760                 return -EINVAL;
 761
 762         switch (state->mixer->protocol) {
 763         case UAC_VERSION_1:
 764         case UAC_VERSION_2:
 765         default:
 766                 mu_channels = uac_mixer_unit_bNrChannels(desc);
 767                 break;
 768         case UAC_VERSION_3:
 769                 mu_channels = get_cluster_channels_v3(state,
 770                                 uac3_mixer_unit_wClusterDescrID(desc));
 771                 break;
 772         }
 773
 774         if (!mu_channels)
 775                 return -EINVAL;
 776
 777         return mu_channels;
 778 }
 779
 780 /*
 781  * parse the source unit recursively until it reaches to a terminal
 782  * or a branched unit.
 783  */
 784 static int check_input_term(struct mixer_build *state, int id,
 785                             struct usb_audio_term *term)
 786 {
 787         int protocol = state->mixer->protocol;
 788         int err;
 789         void *p1;
 790
 791         memset(term, 0, sizeof(*term));
 792         while ((p1 = find_audio_control_unit(state, id)) != NULL) {
 793                 unsigned char *hdr = p1;
 794                 term->id = id;
 795
 796                 if (protocol == UAC_VERSION_1 || protocol == UAC_VERSION_2) {
 797                         switch (hdr[2]) {
 798                         case UAC_INPUT_TERMINAL:
 799                                 if (protocol == UAC_VERSION_1) {
 800                                         struct uac_input_terminal_descriptor *d = p1;
 801
 802                                         term->type = le16_to_cpu(d->wTerminalType);
 803                                         term->channels = d->bNrChannels;
 804                                         term->chconfig = le16_to_cpu(d->wChannelConfig);
 805                                         term->name = d->iTerminal;
 806                                 } else { /* UAC_VERSION_2 */
 807                                         struct uac2_input_terminal_descriptor *d = p1;
 808
 809                                         /* call recursively to verify that the
 810                                          * referenced clock entity is valid */
 811                                         err = check_input_term(state, d->bCSourceID, term);
 812                                         if (err < 0)
 813                                                 return err;
 814
 815                                         /* save input term properties after recursion,
 816                                          * to ensure they are not overriden by the
 817                                          * recursion calls */
 818                                         term->id = id;
 819                                         term->type = le16_to_cpu(d->wTerminalType);
 820                                         term->channels = d->bNrChannels;
 821                                         term->chconfig = le32_to_cpu(d->bmChannelConfig);
 822                                         term->name = d->iTerminal;
 823                                 }
 824                                 return 0;
 825                         case UAC_FEATURE_UNIT: {
 826                                 /* the header is the same for v1 and v2 */
 827                                 struct uac_feature_unit_descriptor *d = p1;
 828
 829                                 id = d->bSourceID;
 830                                 break; /* continue to parse */
 831                         }
 832                         case UAC_MIXER_UNIT: {
 833                                 struct uac_mixer_unit_descriptor *d = p1;
 834
 835                                 term->type = d->bDescriptorSubtype << 16; /* virtual type */
 836                                 term->channels = uac_mixer_unit_bNrChannels(d);
 837                                 term->chconfig = uac_mixer_unit_wChannelConfig(d, protocol);
 838                                 term->name = uac_mixer_unit_iMixer(d);
 839                                 return 0;
 840                         }
 841                         case UAC_SELECTOR_UNIT:
 842                         case UAC2_CLOCK_SELECTOR: {
 843                                 struct uac_selector_unit_descriptor *d = p1;
 844                                 /* call recursively to retrieve the channel info */
 845                                 err = check_input_term(state, d->baSourceID[0], term);
 846                                 if (err < 0)
 847                                         return err;
 848                                 term->type = d->bDescriptorSubtype << 16; /* virtual type */
 849                                 term->id = id;
 850                                 term->name = uac_selector_unit_iSelector(d);
 851                                 return 0;
 852                         }
 853                         case UAC1_PROCESSING_UNIT:
 854                         case UAC1_EXTENSION_UNIT:
 855                         /* UAC2_PROCESSING_UNIT_V2 */
 856                         /* UAC2_EFFECT_UNIT */
 857                         case UAC2_EXTENSION_UNIT_V2: {
 858                                 struct uac_processing_unit_descriptor *d = p1;
 859
 860                                 if (protocol == UAC_VERSION_2 &&
 861                                         hdr[2] == UAC2_EFFECT_UNIT) {
 862                                         /* UAC2/UAC1 unit IDs overlap here in an
 863                                          * uncompatible way. Ignore this unit for now.
 864                                          */
 865                                         return 0;
 866                                 }
 867
 868                                 if (d->bNrInPins) {
 869                                         id = d->baSourceID[0];
 870                                         break; /* continue to parse */
 871                                 }
 872                                 term->type = d->bDescriptorSubtype << 16; /* virtual type */
 873                                 term->channels = uac_processing_unit_bNrChannels(d);
 874                                 term->chconfig = uac_processing_unit_wChannelConfig(d, protocol);
 875                                 term->name = uac_processing_unit_iProcessing(d, protocol);
 876                                 return 0;
 877                         }
 878                         case UAC2_CLOCK_SOURCE: {
 879                                 struct uac_clock_source_descriptor *d = p1;
 880
 881                                 term->type = d->bDescriptorSubtype << 16; /* virtual type */
 882                                 term->id = id;
 883                                 term->name = d->iClockSource;
 884                                 return 0;
 885                         }
 886                         default:
 887                                 return -ENODEV;
 888                         }
 889                 } else { /* UAC_VERSION_3 */
 890                         switch (hdr[2]) {
 891                         case UAC_INPUT_TERMINAL: {
 892                                 struct uac3_input_terminal_descriptor *d = p1;
 893
 894                                 /* call recursively to verify that the
 895                                  * referenced clock entity is valid */
 896                                 err = check_input_term(state, d->bCSourceID, term);
 897                                 if (err < 0)
 898                                         return err;
 899
 900                                 /* save input term properties after recursion,
 901                                  * to ensure they are not overriden by the
 902                                  * recursion calls */
 903                                 term->id = id;
 904                                 term->type = le16_to_cpu(d->wTerminalType);
 905
 906                                 err = get_cluster_channels_v3(state, le16_to_cpu(d->wClusterDescrID));
 907                                 if (err < 0)
 908                                         return err;
 909                                 term->channels = err;
 910
 911                                 /* REVISIT: UAC3 IT doesn't have channels cfg */
 912                                 term->chconfig = 0;
 913
 914                                 term->name = le16_to_cpu(d->wTerminalDescrStr);
 915                                 return 0;
 916                         }
 917                         case UAC3_FEATURE_UNIT: {
 918                                 struct uac3_feature_unit_descriptor *d = p1;
 919
 920                                 id = d->bSourceID;
 921                                 break; /* continue to parse */
 922                         }
 923                         case UAC3_CLOCK_SOURCE: {
 924                                 struct uac3_clock_source_descriptor *d = p1;
 925
 926                                 term->type = d->bDescriptorSubtype << 16; /* virtual type */
 927                                 term->id = id;
 928                                 term->name = le16_to_cpu(d->wClockSourceStr);
 929                                 return 0;
 930                         }
 931                         case UAC3_MIXER_UNIT: {
 932                                 struct uac_mixer_unit_descriptor *d = p1;
 933
 934                                 err = uac_mixer_unit_get_channels(state, d);
 935                                 if (err < 0)
 936                                         return err;
 937
 938                                 term->channels = err;
 939                                 term->type = d->bDescriptorSubtype << 16; /* virtual type */
 940
 941                                 return 0;
 942                         }
 943                         default:
 944                                 return -ENODEV;
 945                         }
 946                 }
 947         }
 948         return -ENODEV;
 949 }
 950
 951 /*
 952  * Feature Unit
 953  */
 954
 955 /* feature unit control information */
 956 struct usb_feature_control_info {
 957         int control;
 958         const char *name;
 959         int type;       /* data type for uac1 */
 960         int type_uac2;  /* data type for uac2 if different from uac1, else -1 */
 961 };
 962
 963 static struct usb_feature_control_info audio_feature_info[] = {
 964         { UAC_FU_MUTE,                  "Mute",                 USB_MIXER_INV_BOOLEAN, -1 },
 965         { UAC_FU_VOLUME,                "Volume",               USB_MIXER_S16, -1 },
 966         { UAC_FU_BASS,                  "Tone Control - Bass",  USB_MIXER_S8, -1 },
 967         { UAC_FU_MID,                   "Tone Control - Mid",   USB_MIXER_S8, -1 },
 968         { UAC_FU_TREBLE,                "Tone Control - Treble", USB_MIXER_S8, -1 },
 969         { UAC_FU_GRAPHIC_EQUALIZER,     "Graphic Equalizer",    USB_MIXER_S8, -1 }, /* FIXME: not implemented yet */
 970         { UAC_FU_AUTOMATIC_GAIN,        "Auto Gain Control",    USB_MIXER_BOOLEAN, -1 },
 971         { UAC_FU_DELAY,                 "Delay Control",        USB_MIXER_U16, USB_MIXER_U32 },
 972         { UAC_FU_BASS_BOOST,            "Bass Boost",           USB_MIXER_BOOLEAN, -1 },
 973         { UAC_FU_LOUDNESS,              "Loudness",             USB_MIXER_BOOLEAN, -1 },
 974         /* UAC2 specific */
 975         { UAC2_FU_INPUT_GAIN,           "Input Gain Control",   USB_MIXER_S16, -1 },
 976         { UAC2_FU_INPUT_GAIN_PAD,       "Input Gain Pad Control", USB_MIXER_S16, -1 },
 977         { UAC2_FU_PHASE_INVERTER,        "Phase Inverter Control", USB_MIXER_BOOLEAN, -1 },
 978 };
 979
 980 /* private_free callback */
 981 void snd_usb_mixer_elem_free(struct snd_kcontrol *kctl)
 982 {
 983         kfree(kctl->private_data);
 984         kctl->private_data = NULL;
 985 }
 986
 987 /*
 988  * interface to ALSA control for feature/mixer units
 989  */
 990
 991 /* volume control quirks */
 992 static void volume_control_quirks(struct usb_mixer_elem_info *cval,
 993                                   struct snd_kcontrol *kctl)
 994 {
 995         struct snd_usb_audio *chip = cval->head.mixer->chip;
 996         switch (chip->usb_id) {
 997         case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
 998         case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
 999                 if (strcmp(kctl->id.name, "Effect Duration") == 0) {
1000                         cval->min = 0x0000;
1001                         cval->max = 0xffff;
1002                         cval->res = 0x00e6;
1003                         break;
1004                 }
1005                 if (strcmp(kctl->id.name, "Effect Volume") == 0 ||
1006                     strcmp(kctl->id.name, "Effect Feedback Volume") == 0) {
1007                         cval->min = 0x00;
1008                         cval->max = 0xff;
1009                         break;
1010                 }
1011                 if (strstr(kctl->id.name, "Effect Return") != NULL) {
1012                         cval->min = 0xb706;
1013                         cval->max = 0xff7b;
1014                         cval->res = 0x0073;
1015                         break;
1016                 }
1017                 if ((strstr(kctl->id.name, "Playback Volume") != NULL) ||
1018                         (strstr(kctl->id.name, "Effect Send") != NULL)) {
1019                         cval->min = 0xb5fb; /* -73 dB = 0xb6ff */
1020                         cval->max = 0xfcfe;
1021                         cval->res = 0x0073;
1022                 }
1023                 break;
1024
1025         case USB_ID(0x0763, 0x2081): /* M-Audio Fast Track Ultra 8R */
1026         case USB_ID(0x0763, 0x2080): /* M-Audio Fast Track Ultra */
1027                 if (strcmp(kctl->id.name, "Effect Duration") == 0) {
1028                         usb_audio_info(chip,
1029                                        "set quirk for FTU Effect Duration\n");
1030                         cval->min = 0x0000;
1031                         cval->max = 0x7f00;
1032                         cval->res = 0x0100;
1033                         break;
1034                 }
1035                 if (strcmp(kctl->id.name, "Effect Volume") == 0 ||
1036                     strcmp(kctl->id.name, "Effect Feedback Volume") == 0) {
1037                         usb_audio_info(chip,
1038                                        "set quirks for FTU Effect Feedback/Volume\n");
1039                         cval->min = 0x00;
1040                         cval->max = 0x7f;
1041                         break;
1042                 }
1043                 break;
1044
1045         case USB_ID(0x0d8c, 0x0103):
1046                 if (!strcmp(kctl->id.name, "PCM Playback Volume")) {
1047                         usb_audio_info(chip,
1048                                  "set volume quirk for CM102-A+/102S+\n");
1049                         cval->min = -256;
1050                 }
1051                 break;
1052
1053         case USB_ID(0x0471, 0x0101):
1054         case USB_ID(0x0471, 0x0104):
1055         case USB_ID(0x0471, 0x0105):
1056         case USB_ID(0x0672, 0x1041):
1057         /* quirk for UDA1321/N101.
1058          * note that detection between firmware 2.1.1.7 (N101)
1059          * and later 2.1.1.21 is not very clear from datasheets.
1060          * I hope that the min value is -15360 for newer firmware --jk
1061          */
1062                 if (!strcmp(kctl->id.name, "PCM Playback Volume") &&
1063                     cval->min == -15616) {
1064                         usb_audio_info(chip,
1065                                  "set volume quirk for UDA1321/N101 chip\n");
1066                         cval->max = -256;
1067                 }
1068                 break;
1069
1070         case USB_ID(0x046d, 0x09a4):
1071                 if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
1072                         usb_audio_info(chip,
1073                                 "set volume quirk for QuickCam E3500\n");
1074                         cval->min = 6080;
1075                         cval->max = 8768;
1076                         cval->res = 192;
1077                 }
1078                 break;
1079
1080         case USB_ID(0x046d, 0x0807): /* Logitech Webcam C500 */
1081         case USB_ID(0x046d, 0x0808):
1082         case USB_ID(0x046d, 0x0809):
1083         case USB_ID(0x046d, 0x0819): /* Logitech Webcam C210 */
1084         case USB_ID(0x046d, 0x081b): /* HD Webcam c310 */
1085         case USB_ID(0x046d, 0x081d): /* HD Webcam c510 */
1086         case USB_ID(0x046d, 0x0825): /* HD Webcam c270 */
1087         case USB_ID(0x046d, 0x0826): /* HD Webcam c525 */
1088         case USB_ID(0x046d, 0x08ca): /* Logitech Quickcam Fusion */
1089         case USB_ID(0x046d, 0x0991):
1090         case USB_ID(0x046d, 0x09a2): /* QuickCam Communicate Deluxe/S7500 */
1091         /* Most audio usb devices lie about volume resolution.
1092          * Most Logitech webcams have res = 384.
1093          * Probably there is some logitech magic behind this number --fishor
1094          */
1095                 if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
1096                         usb_audio_info(chip,
1097                                 "set resolution quirk: cval->res = 384\n");
1098                         cval->res = 384;
1099                 }
1100                 break;
1101         }
1102 }
1103
1104 /*
1105  * retrieve the minimum and maximum values for the specified control
1106  */
1107 static int get_min_max_with_quirks(struct usb_mixer_elem_info *cval,
1108                                    int default_min, struct snd_kcontrol *kctl)
1109 {
1110         /* for failsafe */
1111         cval->min = default_min;
1112         cval->max = cval->min + 1;
1113         cval->res = 1;
1114         cval->dBmin = cval->dBmax = 0;
1115
1116         if (cval->val_type == USB_MIXER_BOOLEAN ||
1117             cval->val_type == USB_MIXER_INV_BOOLEAN) {
1118                 cval->initialized = 1;
1119         } else {
1120                 int minchn = 0;
1121                 if (cval->cmask) {
1122                         int i;
1123                         for (i = 0; i < MAX_CHANNELS; i++)
1124                                 if (cval->cmask & (1 << i)) {
1125                                         minchn = i + 1;
1126                                         break;
1127                                 }
1128                 }
1129                 if (get_ctl_value(cval, UAC_GET_MAX, (cval->control << 8) | minchn, &cval->max) < 0 ||
1130                     get_ctl_value(cval, UAC_GET_MIN, (cval->control << 8) | minchn, &cval->min) < 0) {
1131                         usb_audio_err(cval->head.mixer->chip,
1132                                       "%d:%d: cannot get min/max values for control %d (id %d)\n",
1133                                    cval->head.id, snd_usb_ctrl_intf(cval->head.mixer->chip),
1134                                                                cval->control, cval->head.id);
1135                         return -EINVAL;
1136                 }
1137                 if (get_ctl_value(cval, UAC_GET_RES,
1138                                   (cval->control << 8) | minchn,
1139                                   &cval->res) < 0) {
1140                         cval->res = 1;
1141                 } else {
1142                         int last_valid_res = cval->res;
1143
1144                         while (cval->res > 1) {
1145                                 if (snd_usb_mixer_set_ctl_value(cval, UAC_SET_RES,
1146                                                                 (cval->control << 8) | minchn,
1147                                                                 cval->res / 2) < 0)
1148                                         break;
1149                                 cval->res /= 2;
1150                         }
1151                         if (get_ctl_value(cval, UAC_GET_RES,
1152                                           (cval->control << 8) | minchn, &cval->res) < 0)
1153                                 cval->res = last_valid_res;
1154                 }
1155                 if (cval->res == 0)
1156                         cval->res = 1;
1157
1158                 /* Additional checks for the proper resolution
1159                  *
1160                  * Some devices report smaller resolutions than actually
1161                  * reacting.  They don't return errors but simply clip
1162                  * to the lower aligned value.
1163                  */
1164                 if (cval->min + cval->res < cval->max) {
1165                         int last_valid_res = cval->res;
1166                         int saved, test, check;
1167                         get_cur_mix_raw(cval, minchn, &saved);
1168                         for (;;) {
1169                                 test = saved;
1170                                 if (test < cval->max)
1171                                         test += cval->res;
1172                                 else
1173                                         test -= cval->res;
1174                                 if (test < cval->min || test > cval->max ||
1175                                     snd_usb_set_cur_mix_value(cval, minchn, 0, test) ||
1176                                     get_cur_mix_raw(cval, minchn, &check)) {
1177                                         cval->res = last_valid_res;
1178                                         break;
1179                                 }
1180                                 if (test == check)
1181                                         break;
1182                                 cval->res *= 2;
1183                         }
1184                         snd_usb_set_cur_mix_value(cval, minchn, 0, saved);
1185                 }
1186
1187                 cval->initialized = 1;
1188         }
1189
1190         if (kctl)
1191                 volume_control_quirks(cval, kctl);
1192
1193         /* USB descriptions contain the dB scale in 1/256 dB unit
1194          * while ALSA TLV contains in 1/100 dB unit
1195          */
1196         cval->dBmin = (convert_signed_value(cval, cval->min) * 100) / 256;
1197         cval->dBmax = (convert_signed_value(cval, cval->max) * 100) / 256;
1198         if (cval->dBmin > cval->dBmax) {
1199                 /* something is wrong; assume it's either from/to 0dB */
1200                 if (cval->dBmin < 0)
1201                         cval->dBmax = 0;
1202                 else if (cval->dBmin > 0)
1203                         cval->dBmin = 0;
1204                 if (cval->dBmin > cval->dBmax) {
1205                         /* totally crap, return an error */
1206                         return -EINVAL;
1207                 }
1208         }
1209
1210         return 0;
1211 }
1212
1213 #define get_min_max(cval, def)  get_min_max_with_quirks(cval, def, NULL)
1214
1215 /* get a feature/mixer unit info */
1216 static int mixer_ctl_feature_info(struct snd_kcontrol *kcontrol,
1217                                   struct snd_ctl_elem_info *uinfo)
1218 {
1219         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1220
1221         if (cval->val_type == USB_MIXER_BOOLEAN ||
1222             cval->val_type == USB_MIXER_INV_BOOLEAN)
1223                 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1224         else
1225                 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
1226         uinfo->count = cval->channels;
1227         if (cval->val_type == USB_MIXER_BOOLEAN ||
1228             cval->val_type == USB_MIXER_INV_BOOLEAN) {
1229                 uinfo->value.integer.min = 0;
1230                 uinfo->value.integer.max = 1;
1231         } else {
1232                 if (!cval->initialized) {
1233                         get_min_max_with_quirks(cval, 0, kcontrol);
1234                         if (cval->initialized && cval->dBmin >= cval->dBmax) {
1235                                 kcontrol->vd[0].access &=
1236                                         ~(SNDRV_CTL_ELEM_ACCESS_TLV_READ |
1237                                           SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK);
1238                                 snd_ctl_notify(cval->head.mixer->chip->card,
1239                                                SNDRV_CTL_EVENT_MASK_INFO,
1240                                                &kcontrol->id);
1241                         }
1242                 }
1243                 uinfo->value.integer.min = 0;
1244                 uinfo->value.integer.max =
1245                         (cval->max - cval->min + cval->res - 1) / cval->res;
1246         }
1247         return 0;
1248 }
1249
1250 /* get the current value from feature/mixer unit */
1251 static int mixer_ctl_feature_get(struct snd_kcontrol *kcontrol,
1252                                  struct snd_ctl_elem_value *ucontrol)
1253 {
1254         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1255         int c, cnt, val, err;
1256
1257         ucontrol->value.integer.value[0] = cval->min;
1258         if (cval->cmask) {
1259                 cnt = 0;
1260                 for (c = 0; c < MAX_CHANNELS; c++) {
1261                         if (!(cval->cmask & (1 << c)))
1262                                 continue;
1263                         err = snd_usb_get_cur_mix_value(cval, c + 1, cnt, &val);
1264                         if (err < 0)
1265                                 return filter_error(cval, err);
1266                         val = get_relative_value(cval, val);
1267                         ucontrol->value.integer.value[cnt] = val;
1268                         cnt++;
1269                 }
1270                 return 0;
1271         } else {
1272                 /* master channel */
1273                 err = snd_usb_get_cur_mix_value(cval, 0, 0, &val);
1274                 if (err < 0)
1275                         return filter_error(cval, err);
1276                 val = get_relative_value(cval, val);
1277                 ucontrol->value.integer.value[0] = val;
1278         }
1279         return 0;
1280 }
1281
1282 /* put the current value to feature/mixer unit */
1283 static int mixer_ctl_feature_put(struct snd_kcontrol *kcontrol,
1284                                  struct snd_ctl_elem_value *ucontrol)
1285 {
1286         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1287         int c, cnt, val, oval, err;
1288         int changed = 0;
1289
1290         if (cval->cmask) {
1291                 cnt = 0;
1292                 for (c = 0; c < MAX_CHANNELS; c++) {
1293                         if (!(cval->cmask & (1 << c)))
1294                                 continue;
1295                         err = snd_usb_get_cur_mix_value(cval, c + 1, cnt, &oval);
1296                         if (err < 0)
1297                                 return filter_error(cval, err);
1298                         val = ucontrol->value.integer.value[cnt];
1299                         val = get_abs_value(cval, val);
1300                         if (oval != val) {
1301                                 snd_usb_set_cur_mix_value(cval, c + 1, cnt, val);
1302                                 changed = 1;
1303                         }
1304                         cnt++;
1305                 }
1306         } else {
1307                 /* master channel */
1308                 err = snd_usb_get_cur_mix_value(cval, 0, 0, &oval);
1309                 if (err < 0)
1310                         return filter_error(cval, err);
1311                 val = ucontrol->value.integer.value[0];
1312                 val = get_abs_value(cval, val);
1313                 if (val != oval) {
1314                         snd_usb_set_cur_mix_value(cval, 0, 0, val);
1315                         changed = 1;
1316                 }
1317         }
1318         return changed;
1319 }
1320
1321 /* get the boolean value from the master channel of a UAC control */
1322 static int mixer_ctl_master_bool_get(struct snd_kcontrol *kcontrol,
1323                                      struct snd_ctl_elem_value *ucontrol)
1324 {
1325         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1326         int val, err;
1327
1328         err = snd_usb_get_cur_mix_value(cval, 0, 0, &val);
1329         if (err < 0)
1330                 return filter_error(cval, err);
1331         val = (val != 0);
1332         ucontrol->value.integer.value[0] = val;
1333         return 0;
1334 }
1335
1336 /* get the connectors status and report it as boolean type */
1337 static int mixer_ctl_connector_get(struct snd_kcontrol *kcontrol,
1338                                    struct snd_ctl_elem_value *ucontrol)
1339 {
1340         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1341         struct snd_usb_audio *chip = cval->head.mixer->chip;
1342         int idx = 0, validx, ret, val;
1343
1344         validx = cval->control << 8 | 0;
1345
1346         ret = snd_usb_lock_shutdown(chip) ? -EIO : 0;
1347         if (ret)
1348                 goto error;
1349
1350         idx = snd_usb_ctrl_intf(chip) | (cval->head.id << 8);
1351         if (cval->head.mixer->protocol == UAC_VERSION_2) {
1352                 struct uac2_connectors_ctl_blk uac2_conn;
1353
1354                 ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), UAC2_CS_CUR,
1355                                       USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
1356                                       validx, idx, &uac2_conn, sizeof(uac2_conn));
1357                 val = !!uac2_conn.bNrChannels;
1358         } else { /* UAC_VERSION_3 */
1359                 struct uac3_insertion_ctl_blk uac3_conn;
1360
1361                 ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), UAC2_CS_CUR,
1362                                       USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
1363                                       validx, idx, &uac3_conn, sizeof(uac3_conn));
1364                 val = !!uac3_conn.bmConInserted;
1365         }
1366
1367         snd_usb_unlock_shutdown(chip);
1368
1369         if (ret < 0) {
1370 error:
1371                 usb_audio_err(chip,
1372                         "cannot get connectors status: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
1373                         UAC_GET_CUR, validx, idx, cval->val_type);
1374                 return ret;
1375         }
1376
1377         ucontrol->value.integer.value[0] = val;
1378         return 0;
1379 }
1380
1381 static struct snd_kcontrol_new usb_feature_unit_ctl = {
1382         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1383         .name = "", /* will be filled later manually */
1384         .info = mixer_ctl_feature_info,
1385         .get = mixer_ctl_feature_get,
1386         .put = mixer_ctl_feature_put,
1387 };
1388
1389 /* the read-only variant */
1390 static const struct snd_kcontrol_new usb_feature_unit_ctl_ro = {
1391         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1392         .name = "", /* will be filled later manually */
1393         .info = mixer_ctl_feature_info,
1394         .get = mixer_ctl_feature_get,
1395         .put = NULL,
1396 };
1397
1398 /*
1399  * A control which shows the boolean value from reading a UAC control on
1400  * the master channel.
1401  */
1402 static struct snd_kcontrol_new usb_bool_master_control_ctl_ro = {
1403         .iface = SNDRV_CTL_ELEM_IFACE_CARD,
1404         .name = "", /* will be filled later manually */
1405         .access = SNDRV_CTL_ELEM_ACCESS_READ,
1406         .info = snd_ctl_boolean_mono_info,
1407         .get = mixer_ctl_master_bool_get,
1408         .put = NULL,
1409 };
1410
1411 static const struct snd_kcontrol_new usb_connector_ctl_ro = {
1412         .iface = SNDRV_CTL_ELEM_IFACE_CARD,
1413         .name = "", /* will be filled later manually */
1414         .access = SNDRV_CTL_ELEM_ACCESS_READ,
1415         .info = snd_ctl_boolean_mono_info,
1416         .get = mixer_ctl_connector_get,
1417         .put = NULL,
1418 };
1419
1420 /*
1421  * This symbol is exported in order to allow the mixer quirks to
1422  * hook up to the standard feature unit control mechanism
1423  */
1424 struct snd_kcontrol_new *snd_usb_feature_unit_ctl = &usb_feature_unit_ctl;
1425
1426 /*
1427  * build a feature control
1428  */
1429 static size_t append_ctl_name(struct snd_kcontrol *kctl, const char *str)
1430 {
1431         return strlcat(kctl->id.name, str, sizeof(kctl->id.name));
1432 }
1433
1434 /*
1435  * A lot of headsets/headphones have a "Speaker" mixer. Make sure we
1436  * rename it to "Headphone". We determine if something is a headphone
1437  * similar to how udev determines form factor.
1438  */
1439 static void check_no_speaker_on_headset(struct snd_kcontrol *kctl,
1440                                         struct snd_card *card)
1441 {
1442         const char *names_to_check[] = {
1443                 "Headset", "headset", "Headphone", "headphone", NULL};
1444         const char **s;
1445         bool found = false;
1446
1447         if (strcmp("Speaker", kctl->id.name))
1448                 return;
1449
1450         for (s = names_to_check; *s; s++)
1451                 if (strstr(card->shortname, *s)) {
1452                         found = true;
1453                         break;
1454                 }
1455
1456         if (!found)
1457                 return;
1458
1459         strlcpy(kctl->id.name, "Headphone", sizeof(kctl->id.name));
1460 }
1461
1462 static struct usb_feature_control_info *get_feature_control_info(int control)
1463 {
1464         int i;
1465
1466         for (i = 0; i < ARRAY_SIZE(audio_feature_info); ++i) {
1467                 if (audio_feature_info[i].control == control)
1468                         return &audio_feature_info[i];
1469         }
1470         return NULL;
1471 }
1472
1473 static void __build_feature_ctl(struct usb_mixer_interface *mixer,
1474                                 const struct usbmix_name_map *imap,
1475                                 unsigned int ctl_mask, int control,
1476                                 struct usb_audio_term *iterm,
1477                                 struct usb_audio_term *oterm,
1478                                 int unitid, int nameid, int readonly_mask)
1479 {
1480         struct usb_feature_control_info *ctl_info;
1481         unsigned int len = 0;
1482         int mapped_name = 0;
1483         struct snd_kcontrol *kctl;
1484         struct usb_mixer_elem_info *cval;
1485         const struct usbmix_name_map *map;
1486         unsigned int range;
1487
1488         if (control == UAC_FU_GRAPHIC_EQUALIZER) {
1489                 /* FIXME: not supported yet */
1490                 return;
1491         }
1492
1493         map = find_map(imap, unitid, control);
1494         if (check_ignored_ctl(map))
1495                 return;
1496
1497         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1498         if (!cval)
1499                 return;
1500         snd_usb_mixer_elem_init_std(&cval->head, mixer, unitid);
1501         cval->control = control;
1502         cval->cmask = ctl_mask;
1503
1504         ctl_info = get_feature_control_info(control);
1505         if (!ctl_info) {
1506                 kfree(cval);
1507                 return;
1508         }
1509         if (mixer->protocol == UAC_VERSION_1)
1510                 cval->val_type = ctl_info->type;
1511         else /* UAC_VERSION_2 */
1512                 cval->val_type = ctl_info->type_uac2 >= 0 ?
1513                         ctl_info->type_uac2 : ctl_info->type;
1514
1515         if (ctl_mask == 0) {
1516                 cval->channels = 1;     /* master channel */
1517                 cval->master_readonly = readonly_mask;
1518         } else {
1519                 int i, c = 0;
1520                 for (i = 0; i < 16; i++)
1521                         if (ctl_mask & (1 << i))
1522                                 c++;
1523                 cval->channels = c;
1524                 cval->ch_readonly = readonly_mask;
1525         }
1526
1527         /*
1528          * If all channels in the mask are marked read-only, make the control
1529          * read-only. snd_usb_set_cur_mix_value() will check the mask again and won't
1530          * issue write commands to read-only channels.
1531          */
1532         if (cval->channels == readonly_mask)
1533                 kctl = snd_ctl_new1(&usb_feature_unit_ctl_ro, cval);
1534         else
1535                 kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
1536
1537         if (!kctl) {
1538                 usb_audio_err(mixer->chip, "cannot malloc kcontrol\n");
1539                 kfree(cval);
1540                 return;
1541         }
1542         kctl->private_free = snd_usb_mixer_elem_free;
1543
1544         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
1545         mapped_name = len != 0;
1546         if (!len && nameid)
1547                 len = snd_usb_copy_string_desc(mixer->chip, nameid,
1548                                 kctl->id.name, sizeof(kctl->id.name));
1549
1550         switch (control) {
1551         case UAC_FU_MUTE:
1552         case UAC_FU_VOLUME:
1553                 /*
1554                  * determine the control name.  the rule is:
1555                  * - if a name id is given in descriptor, use it.
1556                  * - if the connected input can be determined, then use the name
1557                  *   of terminal type.
1558                  * - if the connected output can be determined, use it.
1559                  * - otherwise, anonymous name.
1560                  */
1561                 if (!len) {
1562                         if (iterm)
1563                                 len = get_term_name(mixer->chip, iterm,
1564                                                     kctl->id.name,
1565                                                     sizeof(kctl->id.name), 1);
1566                         if (!len && oterm)
1567                                 len = get_term_name(mixer->chip, oterm,
1568                                                     kctl->id.name,
1569                                                     sizeof(kctl->id.name), 1);
1570                         if (!len)
1571                                 snprintf(kctl->id.name, sizeof(kctl->id.name),
1572                                          "Feature %d", unitid);
1573                 }
1574
1575                 if (!mapped_name)
1576                         check_no_speaker_on_headset(kctl, mixer->chip->card);
1577
1578                 /*
1579                  * determine the stream direction:
1580                  * if the connected output is USB stream, then it's likely a
1581                  * capture stream.  otherwise it should be playback (hopefully :)
1582                  */
1583                 if (!mapped_name && oterm && !(oterm->type >> 16)) {
1584                         if ((oterm->type & 0xff00) == 0x0100)
1585                                 append_ctl_name(kctl, " Capture");
1586                         else
1587                                 append_ctl_name(kctl, " Playback");
1588                 }
1589                 append_ctl_name(kctl, control == UAC_FU_MUTE ?
1590                                 " Switch" : " Volume");
1591                 break;
1592         default:
1593                 if (!len)
1594                         strlcpy(kctl->id.name, audio_feature_info[control-1].name,
1595                                 sizeof(kctl->id.name));
1596                 break;
1597         }
1598
1599         /* get min/max values */
1600         get_min_max_with_quirks(cval, 0, kctl);
1601
1602         if (control == UAC_FU_VOLUME) {
1603                 check_mapped_dB(map, cval);
1604                 if (cval->dBmin < cval->dBmax || !cval->initialized) {
1605                         kctl->tlv.c = snd_usb_mixer_vol_tlv;
1606                         kctl->vd[0].access |=
1607                                 SNDRV_CTL_ELEM_ACCESS_TLV_READ |
1608                                 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
1609                 }
1610         }
1611
1612         snd_usb_mixer_fu_apply_quirk(mixer, cval, unitid, kctl);
1613
1614         range = (cval->max - cval->min) / cval->res;
1615         /*
1616          * Are there devices with volume range more than 255? I use a bit more
1617          * to be sure. 384 is a resolution magic number found on Logitech
1618          * devices. It will definitively catch all buggy Logitech devices.
1619          */
1620         if (range > 384) {
1621                 usb_audio_warn(mixer->chip,
1622                                "Warning! Unlikely big volume range (=%u), cval->res is probably wrong.",
1623                                range);
1624                 usb_audio_warn(mixer->chip,
1625                                "[%d] FU [%s] ch = %d, val = %d/%d/%d",
1626                                cval->head.id, kctl->id.name, cval->channels,
1627                                cval->min, cval->max, cval->res);
1628         }
1629
1630         usb_audio_dbg(mixer->chip, "[%d] FU [%s] ch = %d, val = %d/%d/%d\n",
1631                       cval->head.id, kctl->id.name, cval->channels,
1632                       cval->min, cval->max, cval->res);
1633         snd_usb_mixer_add_control(&cval->head, kctl);
1634 }
1635
1636 static void build_feature_ctl(struct mixer_build *state, void *raw_desc,
1637                               unsigned int ctl_mask, int control,
1638                               struct usb_audio_term *iterm, int unitid,
1639                               int readonly_mask)
1640 {
1641         struct uac_feature_unit_descriptor *desc = raw_desc;
1642         int nameid = uac_feature_unit_iFeature(desc);
1643
1644         __build_feature_ctl(state->mixer, state->map, ctl_mask, control,
1645                         iterm, &state->oterm, unitid, nameid, readonly_mask);
1646 }
1647
1648 static void build_feature_ctl_badd(struct usb_mixer_interface *mixer,
1649                               unsigned int ctl_mask, int control, int unitid,
1650                               const struct usbmix_name_map *badd_map)
1651 {
1652         __build_feature_ctl(mixer, badd_map, ctl_mask, control,
1653                         NULL, NULL, unitid, 0, 0);
1654 }
1655
1656 static void get_connector_control_name(struct usb_mixer_interface *mixer,
1657                                        struct usb_audio_term *term,
1658                                        bool is_input, char *name, int name_size)
1659 {
1660         int name_len = get_term_name(mixer->chip, term, name, name_size, 0);
1661
1662         if (name_len == 0)
1663                 strlcpy(name, "Unknown", name_size);
1664
1665         /*
1666          *  sound/core/ctljack.c has a convention of naming jack controls
1667          * by ending in " Jack".  Make it slightly more useful by
1668          * indicating Input or Output after the terminal name.
1669          */
1670         if (is_input)
1671                 strlcat(name, " - Input Jack", name_size);
1672         else
1673                 strlcat(name, " - Output Jack", name_size);
1674 }
1675
1676 /* Build a mixer control for a UAC connector control (jack-detect) */
1677 static void build_connector_control(struct usb_mixer_interface *mixer,
1678                                     struct usb_audio_term *term, bool is_input)
1679 {
1680         struct snd_kcontrol *kctl;
1681         struct usb_mixer_elem_info *cval;
1682
1683         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1684         if (!cval)
1685                 return;
1686         snd_usb_mixer_elem_init_std(&cval->head, mixer, term->id);
1687         /*
1688          * UAC2: The first byte from reading the UAC2_TE_CONNECTOR control returns the
1689          * number of channels connected.
1690          *
1691          * UAC3: The first byte specifies size of bitmap for the inserted controls. The
1692          * following byte(s) specifies which connectors are inserted.
1693          *
1694          * This boolean ctl will simply report if any channels are connected
1695          * or not.
1696          */
1697         if (mixer->protocol == UAC_VERSION_2)
1698                 cval->control = UAC2_TE_CONNECTOR;
1699         else /* UAC_VERSION_3 */
1700                 cval->control = UAC3_TE_INSERTION;
1701
1702         cval->val_type = USB_MIXER_BOOLEAN;
1703         cval->channels = 1; /* report true if any channel is connected */
1704         cval->min = 0;
1705         cval->max = 1;
1706         kctl = snd_ctl_new1(&usb_connector_ctl_ro, cval);
1707         if (!kctl) {
1708                 usb_audio_err(mixer->chip, "cannot malloc kcontrol\n");
1709                 kfree(cval);
1710                 return;
1711         }
1712         get_connector_control_name(mixer, term, is_input, kctl->id.name,
1713                                    sizeof(kctl->id.name));
1714         kctl->private_free = snd_usb_mixer_elem_free;
1715         snd_usb_mixer_add_control(&cval->head, kctl);
1716 }
1717
1718 static int parse_clock_source_unit(struct mixer_build *state, int unitid,
1719                                    void *_ftr)
1720 {
1721         struct uac_clock_source_descriptor *hdr = _ftr;
1722         struct usb_mixer_elem_info *cval;
1723         struct snd_kcontrol *kctl;
1724         char name[SNDRV_CTL_ELEM_ID_NAME_MAXLEN];
1725         int ret;
1726
1727         if (state->mixer->protocol != UAC_VERSION_2)
1728                 return -EINVAL;
1729
1730         if (hdr->bLength != sizeof(*hdr)) {
1731                 usb_audio_dbg(state->chip,
1732                               "Bogus clock source descriptor length of %d, ignoring.\n",
1733                               hdr->bLength);
1734                 return 0;
1735         }
1736
1737         /*
1738          * The only property of this unit we are interested in is the
1739          * clock source validity. If that isn't readable, just bail out.
1740          */
1741         if (!uac_v2v3_control_is_readable(hdr->bmControls,
1742                                       UAC2_CS_CONTROL_CLOCK_VALID))
1743                 return 0;
1744
1745         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1746         if (!cval)
1747                 return -ENOMEM;
1748
1749         snd_usb_mixer_elem_init_std(&cval->head, state->mixer, hdr->bClockID);
1750
1751         cval->min = 0;
1752         cval->max = 1;
1753         cval->channels = 1;
1754         cval->val_type = USB_MIXER_BOOLEAN;
1755         cval->control = UAC2_CS_CONTROL_CLOCK_VALID;
1756
1757         cval->master_readonly = 1;
1758         /* From UAC2 5.2.5.1.2 "Only the get request is supported." */
1759         kctl = snd_ctl_new1(&usb_bool_master_control_ctl_ro, cval);
1760
1761         if (!kctl) {
1762                 kfree(cval);
1763                 return -ENOMEM;
1764         }
1765
1766         kctl->private_free = snd_usb_mixer_elem_free;
1767         ret = snd_usb_copy_string_desc(state->chip, hdr->iClockSource,
1768                                        name, sizeof(name));
1769         if (ret > 0)
1770                 snprintf(kctl->id.name, sizeof(kctl->id.name),
1771                          "%s Validity", name);
1772         else
1773                 snprintf(kctl->id.name, sizeof(kctl->id.name),
1774                          "Clock Source %d Validity", hdr->bClockID);
1775
1776         return snd_usb_mixer_add_control(&cval->head, kctl);
1777 }
1778
1779 /*
1780  * parse a feature unit
1781  *
1782  * most of controls are defined here.
1783  */
1784 static int parse_audio_feature_unit(struct mixer_build *state, int unitid,
1785                                     void *_ftr)
1786 {
1787         int channels, i, j;
1788         struct usb_audio_term iterm;
1789         unsigned int master_bits, first_ch_bits;
1790         int err, csize;
1791         struct uac_feature_unit_descriptor *hdr = _ftr;
1792         __u8 *bmaControls;
1793
1794         if (state->mixer->protocol == UAC_VERSION_1) {
1795                 if (hdr->bLength < 7) {
1796                         usb_audio_err(state->chip,
1797                                       "unit %u: invalid UAC_FEATURE_UNIT descriptor\n",
1798                                       unitid);
1799                         return -EINVAL;
1800                 }
1801                 csize = hdr->bControlSize;
1802                 if (!csize) {
1803                         usb_audio_dbg(state->chip,
1804                                       "unit %u: invalid bControlSize == 0\n",
1805                                       unitid);
1806                         return -EINVAL;
1807                 }
1808                 channels = (hdr->bLength - 7) / csize - 1;
1809                 bmaControls = hdr->bmaControls;
1810                 if (hdr->bLength < 7 + csize) {
1811                         usb_audio_err(state->chip,
1812                                       "unit %u: invalid UAC_FEATURE_UNIT descriptor\n",
1813                                       unitid);
1814                         return -EINVAL;
1815                 }
1816         } else if (state->mixer->protocol == UAC_VERSION_2) {
1817                 struct uac2_feature_unit_descriptor *ftr = _ftr;
1818                 if (hdr->bLength < 6) {
1819                         usb_audio_err(state->chip,
1820                                       "unit %u: invalid UAC_FEATURE_UNIT descriptor\n",
1821                                       unitid);
1822                         return -EINVAL;
1823                 }
1824                 csize = 4;
1825                 channels = (hdr->bLength - 6) / 4 - 1;
1826                 bmaControls = ftr->bmaControls;
1827                 if (hdr->bLength < 6 + csize) {
1828                         usb_audio_err(state->chip,
1829                                       "unit %u: invalid UAC_FEATURE_UNIT descriptor\n",
1830                                       unitid);
1831                         return -EINVAL;
1832                 }
1833         } else { /* UAC_VERSION_3 */
1834                 struct uac3_feature_unit_descriptor *ftr = _ftr;
1835
1836                 if (hdr->bLength < 7) {
1837                         usb_audio_err(state->chip,
1838                                       "unit %u: invalid UAC3_FEATURE_UNIT descriptor\n",
1839                                       unitid);
1840                         return -EINVAL;
1841                 }
1842                 csize = 4;
1843                 channels = (ftr->bLength - 7) / 4 - 1;
1844                 bmaControls = ftr->bmaControls;
1845                 if (hdr->bLength < 7 + csize) {
1846                         usb_audio_err(state->chip,
1847                                       "unit %u: invalid UAC3_FEATURE_UNIT descriptor\n",
1848                                       unitid);
1849                         return -EINVAL;
1850                 }
1851         }
1852
1853         /* parse the source unit */
1854         err = parse_audio_unit(state, hdr->bSourceID);
1855         if (err < 0)
1856                 return err;
1857
1858         /* determine the input source type and name */
1859         err = check_input_term(state, hdr->bSourceID, &iterm);
1860         if (err < 0)
1861                 return err;
1862
1863         master_bits = snd_usb_combine_bytes(bmaControls, csize);
1864         /* master configuration quirks */
1865         switch (state->chip->usb_id) {
1866         case USB_ID(0x08bb, 0x2702):
1867                 usb_audio_info(state->chip,
1868                                "usbmixer: master volume quirk for PCM2702 chip\n");
1869                 /* disable non-functional volume control */
1870                 master_bits &= ~UAC_CONTROL_BIT(UAC_FU_VOLUME);
1871                 break;
1872         case USB_ID(0x1130, 0xf211):
1873                 usb_audio_info(state->chip,
1874                                "usbmixer: volume control quirk for Tenx TP6911 Audio Headset\n");
1875                 /* disable non-functional volume control */
1876                 channels = 0;
1877                 break;
1878
1879         }
1880         if (channels > 0)
1881                 first_ch_bits = snd_usb_combine_bytes(bmaControls + csize, csize);
1882         else
1883                 first_ch_bits = 0;
1884
1885         if (state->mixer->protocol == UAC_VERSION_1) {
1886                 /* check all control types */
1887                 for (i = 0; i < 10; i++) {
1888                         unsigned int ch_bits = 0;
1889                         int control = audio_feature_info[i].control;
1890
1891                         for (j = 0; j < channels; j++) {
1892                                 unsigned int mask;
1893
1894                                 mask = snd_usb_combine_bytes(bmaControls +
1895                                                              csize * (j+1), csize);
1896                                 if (mask & (1 << i))
1897                                         ch_bits |= (1 << j);
1898                         }
1899                         /* audio class v1 controls are never read-only */
1900
1901                         /*
1902                          * The first channel must be set
1903                          * (for ease of programming).
1904                          */
1905                         if (ch_bits & 1)
1906                                 build_feature_ctl(state, _ftr, ch_bits, control,
1907                                                   &iterm, unitid, 0);
1908                         if (master_bits & (1 << i))
1909                                 build_feature_ctl(state, _ftr, 0, control,
1910                                                   &iterm, unitid, 0);
1911                 }
1912         } else { /* UAC_VERSION_2/3 */
1913                 for (i = 0; i < ARRAY_SIZE(audio_feature_info); i++) {
1914                         unsigned int ch_bits = 0;
1915                         unsigned int ch_read_only = 0;
1916                         int control = audio_feature_info[i].control;
1917
1918                         for (j = 0; j < channels; j++) {
1919                                 unsigned int mask;
1920
1921                                 mask = snd_usb_combine_bytes(bmaControls +
1922                                                              csize * (j+1), csize);
1923                                 if (uac_v2v3_control_is_readable(mask, control)) {
1924                                         ch_bits |= (1 << j);
1925                                         if (!uac_v2v3_control_is_writeable(mask, control))
1926                                                 ch_read_only |= (1 << j);
1927                                 }
1928                         }
1929
1930                         /*
1931                          * NOTE: build_feature_ctl() will mark the control
1932                          * read-only if all channels are marked read-only in
1933                          * the descriptors. Otherwise, the control will be
1934                          * reported as writeable, but the driver will not
1935                          * actually issue a write command for read-only
1936                          * channels.
1937                          */
1938
1939                         /*
1940                          * The first channel must be set
1941                          * (for ease of programming).
1942                          */
1943                         if (ch_bits & 1)
1944                                 build_feature_ctl(state, _ftr, ch_bits, control,
1945                                                   &iterm, unitid, ch_read_only);
1946                         if (uac_v2v3_control_is_readable(master_bits, control))
1947                                 build_feature_ctl(state, _ftr, 0, control,
1948                                                   &iterm, unitid,
1949                                                   !uac_v2v3_control_is_writeable(master_bits,
1950                                                                                  control));
1951                 }
1952         }
1953
1954         return 0;
1955 }
1956
1957 /*
1958  * Mixer Unit
1959  */
1960
1961 /*
1962  * build a mixer unit control
1963  *
1964  * the callbacks are identical with feature unit.
1965  * input channel number (zero based) is given in control field instead.
1966  */
1967 static void build_mixer_unit_ctl(struct mixer_build *state,
1968                                  struct uac_mixer_unit_descriptor *desc,
1969                                  int in_pin, int in_ch, int num_outs,
1970                                  int unitid, struct usb_audio_term *iterm)
1971 {
1972         struct usb_mixer_elem_info *cval;
1973         unsigned int i, len;
1974         struct snd_kcontrol *kctl;
1975         const struct usbmix_name_map *map;
1976
1977         map = find_map(state->map, unitid, 0);
1978         if (check_ignored_ctl(map))
1979                 return;
1980
1981         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1982         if (!cval)
1983                 return;
1984
1985         snd_usb_mixer_elem_init_std(&cval->head, state->mixer, unitid);
1986         cval->control = in_ch + 1; /* based on 1 */
1987         cval->val_type = USB_MIXER_S16;
1988         for (i = 0; i < num_outs; i++) {
1989                 __u8 *c = uac_mixer_unit_bmControls(desc, state->mixer->protocol);
1990
1991                 if (check_matrix_bitmap(c, in_ch, i, num_outs)) {
1992                         cval->cmask |= (1 << i);
1993                         cval->channels++;
1994                 }
1995         }
1996
1997         /* get min/max values */
1998         get_min_max(cval, 0);
1999
2000         kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
2001         if (!kctl) {
2002                 usb_audio_err(state->chip, "cannot malloc kcontrol\n");
2003                 kfree(cval);
2004                 return;
2005         }
2006         kctl->private_free = snd_usb_mixer_elem_free;
2007
2008         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
2009         if (!len)
2010                 len = get_term_name(state->chip, iterm, kctl->id.name,
2011                                     sizeof(kctl->id.name), 0);
2012         if (!len)
2013                 len = sprintf(kctl->id.name, "Mixer Source %d", in_ch + 1);
2014         append_ctl_name(kctl, " Volume");
2015
2016         usb_audio_dbg(state->chip, "[%d] MU [%s] ch = %d, val = %d/%d\n",
2017                     cval->head.id, kctl->id.name, cval->channels, cval->min, cval->max);
2018         snd_usb_mixer_add_control(&cval->head, kctl);
2019 }
2020
2021 static int parse_audio_input_terminal(struct mixer_build *state, int unitid,
2022                                       void *raw_desc)
2023 {
2024         struct usb_audio_term iterm;
2025         unsigned int control, bmctls, term_id;
2026
2027         if (state->mixer->protocol == UAC_VERSION_2) {
2028                 struct uac2_input_terminal_descriptor *d_v2 = raw_desc;
2029                 control = UAC2_TE_CONNECTOR;
2030                 term_id = d_v2->bTerminalID;
2031                 bmctls = le16_to_cpu(d_v2->bmControls);
2032         } else if (state->mixer->protocol == UAC_VERSION_3) {
2033                 struct uac3_input_terminal_descriptor *d_v3 = raw_desc;
2034                 control = UAC3_TE_INSERTION;
2035                 term_id = d_v3->bTerminalID;
2036                 bmctls = le32_to_cpu(d_v3->bmControls);
2037         } else {
2038                 return 0; /* UAC1. No Insertion control */
2039         }
2040
2041         check_input_term(state, term_id, &iterm);
2042
2043         /* Check for jack detection. */
2044         if (uac_v2v3_control_is_readable(bmctls, control))
2045                 build_connector_control(state->mixer, &iterm, true);
2046
2047         return 0;
2048 }
2049
2050 /*
2051  * parse a mixer unit
2052  */
2053 static int parse_audio_mixer_unit(struct mixer_build *state, int unitid,
2054                                   void *raw_desc)
2055 {
2056         struct uac_mixer_unit_descriptor *desc = raw_desc;
2057         struct usb_audio_term iterm;
2058         int input_pins, num_ins, num_outs;
2059         int pin, ich, err;
2060
2061         err = uac_mixer_unit_get_channels(state, desc);
2062         if (err < 0) {
2063                 usb_audio_err(state->chip,
2064                               "invalid MIXER UNIT descriptor %d\n",
2065                               unitid);
2066                 return err;
2067         }
2068
2069         num_outs = err;
2070         input_pins = desc->bNrInPins;
2071
2072         num_ins = 0;
2073         ich = 0;
2074         for (pin = 0; pin < input_pins; pin++) {
2075                 err = parse_audio_unit(state, desc->baSourceID[pin]);
2076                 if (err < 0)
2077                         continue;
2078                 /* no bmControls field (e.g. Maya44) -> ignore */
2079                 if (desc->bLength <= 10 + input_pins)
2080                         continue;
2081                 err = check_input_term(state, desc->baSourceID[pin], &iterm);
2082                 if (err < 0)
2083                         return err;
2084                 num_ins += iterm.channels;
2085                 for (; ich < num_ins; ich++) {
2086                         int och, ich_has_controls = 0;
2087
2088                         for (och = 0; och < num_outs; och++) {
2089                                 __u8 *c = uac_mixer_unit_bmControls(desc,
2090                                                 state->mixer->protocol);
2091
2092                                 if (check_matrix_bitmap(c, ich, och, num_outs)) {
2093                                         ich_has_controls = 1;
2094                                         break;
2095                                 }
2096                         }
2097                         if (ich_has_controls)
2098                                 build_mixer_unit_ctl(state, desc, pin, ich, num_outs,
2099                                                      unitid, &iterm);
2100                 }
2101         }
2102         return 0;
2103 }
2104
2105 /*
2106  * Processing Unit / Extension Unit
2107  */
2108
2109 /* get callback for processing/extension unit */
2110 static int mixer_ctl_procunit_get(struct snd_kcontrol *kcontrol,
2111                                   struct snd_ctl_elem_value *ucontrol)
2112 {
2113         struct usb_mixer_elem_info *cval = kcontrol->private_data;
2114         int err, val;
2115
2116         err = get_cur_ctl_value(cval, cval->control << 8, &val);
2117         if (err < 0) {
2118                 ucontrol->value.integer.value[0] = cval->min;
2119                 return filter_error(cval, err);
2120         }
2121         val = get_relative_value(cval, val);
2122         ucontrol->value.integer.value[0] = val;
2123         return 0;
2124 }
2125
2126 /* put callback for processing/extension unit */
2127 static int mixer_ctl_procunit_put(struct snd_kcontrol *kcontrol,
2128                                   struct snd_ctl_elem_value *ucontrol)
2129 {
2130         struct usb_mixer_elem_info *cval = kcontrol->private_data;
2131         int val, oval, err;
2132
2133         err = get_cur_ctl_value(cval, cval->control << 8, &oval);
2134         if (err < 0)
2135                 return filter_error(cval, err);
2136         val = ucontrol->value.integer.value[0];
2137         val = get_abs_value(cval, val);
2138         if (val != oval) {
2139                 set_cur_ctl_value(cval, cval->control << 8, val);
2140                 return 1;
2141         }
2142         return 0;
2143 }
2144
2145 /* alsa control interface for processing/extension unit */
2146 static const struct snd_kcontrol_new mixer_procunit_ctl = {
2147         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
2148         .name = "", /* will be filled later */
2149         .info = mixer_ctl_feature_info,
2150         .get = mixer_ctl_procunit_get,
2151         .put = mixer_ctl_procunit_put,
2152 };
2153
2154 /*
2155  * predefined data for processing units
2156  */
2157 struct procunit_value_info {
2158         int control;
2159         char *suffix;
2160         int val_type;
2161         int min_value;
2162 };
2163
2164 struct procunit_info {
2165         int type;
2166         char *name;
2167         struct procunit_value_info *values;
2168 };
2169
2170 static struct procunit_value_info updown_proc_info[] = {
2171         { UAC_UD_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2172         { UAC_UD_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
2173         { 0 }
2174 };
2175 static struct procunit_value_info prologic_proc_info[] = {
2176         { UAC_DP_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2177         { UAC_DP_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
2178         { 0 }
2179 };
2180 static struct procunit_value_info threed_enh_proc_info[] = {
2181         { UAC_3D_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2182         { UAC_3D_SPACE, "Spaciousness", USB_MIXER_U8 },
2183         { 0 }
2184 };
2185 static struct procunit_value_info reverb_proc_info[] = {
2186         { UAC_REVERB_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2187         { UAC_REVERB_LEVEL, "Level", USB_MIXER_U8 },
2188         { UAC_REVERB_TIME, "Time", USB_MIXER_U16 },
2189         { UAC_REVERB_FEEDBACK, "Feedback", USB_MIXER_U8 },
2190         { 0 }
2191 };
2192 static struct procunit_value_info chorus_proc_info[] = {
2193         { UAC_CHORUS_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2194         { UAC_CHORUS_LEVEL, "Level", USB_MIXER_U8 },
2195         { UAC_CHORUS_RATE, "Rate", USB_MIXER_U16 },
2196         { UAC_CHORUS_DEPTH, "Depth", USB_MIXER_U16 },
2197         { 0 }
2198 };
2199 static struct procunit_value_info dcr_proc_info[] = {
2200         { UAC_DCR_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2201         { UAC_DCR_RATE, "Ratio", USB_MIXER_U16 },
2202         { UAC_DCR_MAXAMPL, "Max Amp", USB_MIXER_S16 },
2203         { UAC_DCR_THRESHOLD, "Threshold", USB_MIXER_S16 },
2204         { UAC_DCR_ATTACK_TIME, "Attack Time", USB_MIXER_U16 },
2205         { UAC_DCR_RELEASE_TIME, "Release Time", USB_MIXER_U16 },
2206         { 0 }
2207 };
2208
2209 static struct procunit_info procunits[] = {
2210         { UAC_PROCESS_UP_DOWNMIX, "Up Down", updown_proc_info },
2211         { UAC_PROCESS_DOLBY_PROLOGIC, "Dolby Prologic", prologic_proc_info },
2212         { UAC_PROCESS_STEREO_EXTENDER, "3D Stereo Extender", threed_enh_proc_info },
2213         { UAC_PROCESS_REVERB, "Reverb", reverb_proc_info },
2214         { UAC_PROCESS_CHORUS, "Chorus", chorus_proc_info },
2215         { UAC_PROCESS_DYN_RANGE_COMP, "DCR", dcr_proc_info },
2216         { 0 },
2217 };
2218 /*
2219  * predefined data for extension units
2220  */
2221 static struct procunit_value_info clock_rate_xu_info[] = {
2222         { USB_XU_CLOCK_RATE_SELECTOR, "Selector", USB_MIXER_U8, 0 },
2223         { 0 }
2224 };
2225 static struct procunit_value_info clock_source_xu_info[] = {
2226         { USB_XU_CLOCK_SOURCE_SELECTOR, "External", USB_MIXER_BOOLEAN },
2227         { 0 }
2228 };
2229 static struct procunit_value_info spdif_format_xu_info[] = {
2230         { USB_XU_DIGITAL_FORMAT_SELECTOR, "SPDIF/AC3", USB_MIXER_BOOLEAN },
2231         { 0 }
2232 };
2233 static struct procunit_value_info soft_limit_xu_info[] = {
2234         { USB_XU_SOFT_LIMIT_SELECTOR, " ", USB_MIXER_BOOLEAN },
2235         { 0 }
2236 };
2237 static struct procunit_info extunits[] = {
2238         { USB_XU_CLOCK_RATE, "Clock rate", clock_rate_xu_info },
2239         { USB_XU_CLOCK_SOURCE, "DigitalIn CLK source", clock_source_xu_info },
2240         { USB_XU_DIGITAL_IO_STATUS, "DigitalOut format:", spdif_format_xu_info },
2241         { USB_XU_DEVICE_OPTIONS, "AnalogueIn Soft Limit", soft_limit_xu_info },
2242         { 0 }
2243 };
2244
2245 /*
2246  * build a processing/extension unit
2247  */
2248 static int build_audio_procunit(struct mixer_build *state, int unitid,
2249                                 void *raw_desc, struct procunit_info *list,
2250                                 char *name)
2251 {
2252         struct uac_processing_unit_descriptor *desc = raw_desc;
2253         int num_ins = desc->bNrInPins;
2254         struct usb_mixer_elem_info *cval;
2255         struct snd_kcontrol *kctl;
2256         int i, err, nameid, type, len;
2257         struct procunit_info *info;
2258         struct procunit_value_info *valinfo;
2259         const struct usbmix_name_map *map;
2260         static struct procunit_value_info default_value_info[] = {
2261                 { 0x01, "Switch", USB_MIXER_BOOLEAN },
2262                 { 0 }
2263         };
2264         static struct procunit_info default_info = {
2265                 0, NULL, default_value_info
2266         };
2267
2268         if (desc->bLength < 13 || desc->bLength < 13 + num_ins ||
2269             desc->bLength < num_ins + uac_processing_unit_bControlSize(desc, state->mixer->protocol)) {
2270                 usb_audio_err(state->chip, "invalid %s descriptor (id %d)\n", name, unitid);
2271                 return -EINVAL;
2272         }
2273
2274         for (i = 0; i < num_ins; i++) {
2275                 err = parse_audio_unit(state, desc->baSourceID[i]);
2276                 if (err < 0)
2277                         return err;
2278         }
2279
2280         type = le16_to_cpu(desc->wProcessType);
2281         for (info = list; info && info->type; info++)
2282                 if (info->type == type)
2283                         break;
2284         if (!info || !info->type)
2285                 info = &default_info;
2286
2287         for (valinfo = info->values; valinfo->control; valinfo++) {
2288                 __u8 *controls = uac_processing_unit_bmControls(desc, state->mixer->protocol);
2289
2290                 if (!(controls[valinfo->control / 8] & (1 << ((valinfo->control % 8) - 1))))
2291                         continue;
2292                 map = find_map(state->map, unitid, valinfo->control);
2293                 if (check_ignored_ctl(map))
2294                         continue;
2295                 cval = kzalloc(sizeof(*cval), GFP_KERNEL);
2296                 if (!cval)
2297                         return -ENOMEM;
2298                 snd_usb_mixer_elem_init_std(&cval->head, state->mixer, unitid);
2299                 cval->control = valinfo->control;
2300                 cval->val_type = valinfo->val_type;
2301                 cval->channels = 1;
2302
2303                 /* get min/max values */
2304                 if (type == UAC_PROCESS_UP_DOWNMIX && cval->control == UAC_UD_MODE_SELECT) {
2305                         __u8 *control_spec = uac_processing_unit_specific(desc, state->mixer->protocol);
2306                         /* FIXME: hard-coded */
2307                         cval->min = 1;
2308                         cval->max = control_spec[0];
2309                         cval->res = 1;
2310                         cval->initialized = 1;
2311                 } else {
2312                         if (type == USB_XU_CLOCK_RATE) {
2313                                 /*
2314                                  * E-Mu USB 0404/0202/TrackerPre/0204
2315                                  * samplerate control quirk
2316                                  */
2317                                 cval->min = 0;
2318                                 cval->max = 5;
2319                                 cval->res = 1;
2320                                 cval->initialized = 1;
2321                         } else
2322                                 get_min_max(cval, valinfo->min_value);
2323                 }
2324
2325                 kctl = snd_ctl_new1(&mixer_procunit_ctl, cval);
2326                 if (!kctl) {
2327                         kfree(cval);
2328                         return -ENOMEM;
2329                 }
2330                 kctl->private_free = snd_usb_mixer_elem_free;
2331
2332                 if (check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name))) {
2333                         /* nothing */ ;
2334                 } else if (info->name) {
2335                         strlcpy(kctl->id.name, info->name, sizeof(kctl->id.name));
2336                 } else {
2337                         nameid = uac_processing_unit_iProcessing(desc, state->mixer->protocol);
2338                         len = 0;
2339                         if (nameid)
2340                                 len = snd_usb_copy_string_desc(state->chip,
2341                                                                nameid,
2342                                                                kctl->id.name,
2343                                                                sizeof(kctl->id.name));
2344                         if (!len)
2345                                 strlcpy(kctl->id.name, name, sizeof(kctl->id.name));
2346                 }
2347                 append_ctl_name(kctl, " ");
2348                 append_ctl_name(kctl, valinfo->suffix);
2349
2350                 usb_audio_dbg(state->chip,
2351                               "[%d] PU [%s] ch = %d, val = %d/%d\n",
2352                               cval->head.id, kctl->id.name, cval->channels,
2353                               cval->min, cval->max);
2354
2355                 err = snd_usb_mixer_add_control(&cval->head, kctl);
2356                 if (err < 0)
2357                         return err;
2358         }
2359         return 0;
2360 }
2361
2362 static int parse_audio_processing_unit(struct mixer_build *state, int unitid,
2363                                        void *raw_desc)
2364 {
2365         return build_audio_procunit(state, unitid, raw_desc,
2366                                     procunits, "Processing Unit");
2367 }
2368
2369 static int parse_audio_extension_unit(struct mixer_build *state, int unitid,
2370                                       void *raw_desc)
2371 {
2372         /*
2373          * Note that we parse extension units with processing unit descriptors.
2374          * That's ok as the layout is the same.
2375          */
2376         return build_audio_procunit(state, unitid, raw_desc,
2377                                     extunits, "Extension Unit");
2378 }
2379
2380 /*
2381  * Selector Unit
2382  */
2383
2384 /*
2385  * info callback for selector unit
2386  * use an enumerator type for routing
2387  */
2388 static int mixer_ctl_selector_info(struct snd_kcontrol *kcontrol,
2389                                    struct snd_ctl_elem_info *uinfo)
2390 {
2391         struct usb_mixer_elem_info *cval = kcontrol->private_data;
2392         const char **itemlist = (const char **)kcontrol->private_value;
2393
2394         if (snd_BUG_ON(!itemlist))
2395                 return -EINVAL;
2396         return snd_ctl_enum_info(uinfo, 1, cval->max, itemlist);
2397 }
2398
2399 /* get callback for selector unit */
2400 static int mixer_ctl_selector_get(struct snd_kcontrol *kcontrol,
2401                                   struct snd_ctl_elem_value *ucontrol)
2402 {
2403         struct usb_mixer_elem_info *cval = kcontrol->private_data;
2404         int val, err;
2405
2406         err = get_cur_ctl_value(cval, cval->control << 8, &val);
2407         if (err < 0) {
2408                 ucontrol->value.enumerated.item[0] = 0;
2409                 return filter_error(cval, err);
2410         }
2411         val = get_relative_value(cval, val);
2412         ucontrol->value.enumerated.item[0] = val;
2413         return 0;
2414 }
2415
2416 /* put callback for selector unit */
2417 static int mixer_ctl_selector_put(struct snd_kcontrol *kcontrol,
2418                                   struct snd_ctl_elem_value *ucontrol)
2419 {
2420         struct usb_mixer_elem_info *cval = kcontrol->private_data;
2421         int val, oval, err;
2422
2423         err = get_cur_ctl_value(cval, cval->control << 8, &oval);
2424         if (err < 0)
2425                 return filter_error(cval, err);
2426         val = ucontrol->value.enumerated.item[0];
2427         val = get_abs_value(cval, val);
2428         if (val != oval) {
2429                 set_cur_ctl_value(cval, cval->control << 8, val);
2430                 return 1;
2431         }
2432         return 0;
2433 }
2434
2435 /* alsa control interface for selector unit */
2436 static const struct snd_kcontrol_new mixer_selectunit_ctl = {
2437         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
2438         .name = "", /* will be filled later */
2439         .info = mixer_ctl_selector_info,
2440         .get = mixer_ctl_selector_get,
2441         .put = mixer_ctl_selector_put,
2442 };
2443
2444 /*
2445  * private free callback.
2446  * free both private_data and private_value
2447  */
2448 static void usb_mixer_selector_elem_free(struct snd_kcontrol *kctl)
2449 {
2450         int i, num_ins = 0;
2451
2452         if (kctl->private_data) {
2453                 struct usb_mixer_elem_info *cval = kctl->private_data;
2454                 num_ins = cval->max;
2455                 kfree(cval);
2456                 kctl->private_data = NULL;
2457         }
2458         if (kctl->private_value) {
2459                 char **itemlist = (char **)kctl->private_value;
2460                 for (i = 0; i < num_ins; i++)
2461                         kfree(itemlist[i]);
2462                 kfree(itemlist);
2463                 kctl->private_value = 0;
2464         }
2465 }
2466
2467 /*
2468  * parse a selector unit
2469  */
2470 static int parse_audio_selector_unit(struct mixer_build *state, int unitid,
2471                                      void *raw_desc)
2472 {
2473         struct uac_selector_unit_descriptor *desc = raw_desc;
2474         unsigned int i, nameid, len;
2475         int err;
2476         struct usb_mixer_elem_info *cval;
2477         struct snd_kcontrol *kctl;
2478         const struct usbmix_name_map *map;
2479         char **namelist;
2480
2481         if (desc->bLength < 5 || !desc->bNrInPins ||
2482             desc->bLength < 5 + desc->bNrInPins) {
2483                 usb_audio_err(state->chip,
2484                         "invalid SELECTOR UNIT descriptor %d\n", unitid);
2485                 return -EINVAL;
2486         }
2487
2488         for (i = 0; i < desc->bNrInPins; i++) {
2489                 err = parse_audio_unit(state, desc->baSourceID[i]);
2490                 if (err < 0)
2491                         return err;
2492         }
2493
2494         if (desc->bNrInPins == 1) /* only one ? nonsense! */
2495                 return 0;
2496
2497         map = find_map(state->map, unitid, 0);
2498         if (check_ignored_ctl(map))
2499                 return 0;
2500
2501         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
2502         if (!cval)
2503                 return -ENOMEM;
2504         snd_usb_mixer_elem_init_std(&cval->head, state->mixer, unitid);
2505         cval->val_type = USB_MIXER_U8;
2506         cval->channels = 1;
2507         cval->min = 1;
2508         cval->max = desc->bNrInPins;
2509         cval->res = 1;
2510         cval->initialized = 1;
2511
2512         if (state->mixer->protocol == UAC_VERSION_1)
2513                 cval->control = 0;
2514         else /* UAC_VERSION_2 */
2515                 cval->control = (desc->bDescriptorSubtype == UAC2_CLOCK_SELECTOR) ?
2516                         UAC2_CX_CLOCK_SELECTOR : UAC2_SU_SELECTOR;
2517
2518         namelist = kmalloc(sizeof(char *) * desc->bNrInPins, GFP_KERNEL);
2519         if (!namelist) {
2520                 kfree(cval);
2521                 return -ENOMEM;
2522         }
2523 #define MAX_ITEM_NAME_LEN       64
2524         for (i = 0; i < desc->bNrInPins; i++) {
2525                 struct usb_audio_term iterm;
2526                 len = 0;
2527                 namelist[i] = kmalloc(MAX_ITEM_NAME_LEN, GFP_KERNEL);
2528                 if (!namelist[i]) {
2529                         while (i--)
2530                                 kfree(namelist[i]);
2531                         kfree(namelist);
2532                         kfree(cval);
2533                         return -ENOMEM;
2534                 }
2535                 len = check_mapped_selector_name(state, unitid, i, namelist[i],
2536                                                  MAX_ITEM_NAME_LEN);
2537                 if (! len && check_input_term(state, desc->baSourceID[i], &iterm) >= 0)
2538                         len = get_term_name(state->chip, &iterm, namelist[i],
2539                                             MAX_ITEM_NAME_LEN, 0);
2540                 if (! len)
2541                         sprintf(namelist[i], "Input %u", i);
2542         }
2543
2544         kctl = snd_ctl_new1(&mixer_selectunit_ctl, cval);
2545         if (! kctl) {
2546                 usb_audio_err(state->chip, "cannot malloc kcontrol\n");
2547                 kfree(namelist);
2548                 kfree(cval);
2549                 return -ENOMEM;
2550         }
2551         kctl->private_value = (unsigned long)namelist;
2552         kctl->private_free = usb_mixer_selector_elem_free;
2553
2554         /* check the static mapping table at first */
2555         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
2556         if (!len) {
2557                 /* no mapping ? */
2558                 /* if iSelector is given, use it */
2559                 nameid = uac_selector_unit_iSelector(desc);
2560                 if (nameid)
2561                         len = snd_usb_copy_string_desc(state->chip, nameid,
2562                                                        kctl->id.name,
2563                                                        sizeof(kctl->id.name));
2564                 /* ... or pick up the terminal name at next */
2565                 if (!len)
2566                         len = get_term_name(state->chip, &state->oterm,
2567                                     kctl->id.name, sizeof(kctl->id.name), 0);
2568                 /* ... or use the fixed string "USB" as the last resort */
2569                 if (!len)
2570                         strlcpy(kctl->id.name, "USB", sizeof(kctl->id.name));
2571
2572                 /* and add the proper suffix */
2573                 if (desc->bDescriptorSubtype == UAC2_CLOCK_SELECTOR)
2574                         append_ctl_name(kctl, " Clock Source");
2575                 else if ((state->oterm.type & 0xff00) == 0x0100)
2576                         append_ctl_name(kctl, " Capture Source");
2577                 else
2578                         append_ctl_name(kctl, " Playback Source");
2579         }
2580
2581         usb_audio_dbg(state->chip, "[%d] SU [%s] items = %d\n",
2582                     cval->head.id, kctl->id.name, desc->bNrInPins);
2583         return snd_usb_mixer_add_control(&cval->head, kctl);
2584 }
2585
2586 /*
2587  * parse an audio unit recursively
2588  */
2589
2590 static int parse_audio_unit(struct mixer_build *state, int unitid)
2591 {
2592         unsigned char *p1;
2593         int protocol = state->mixer->protocol;
2594
2595         if (test_and_set_bit(unitid, state->unitbitmap))
2596                 return 0; /* the unit already visited */
2597
2598         p1 = find_audio_control_unit(state, unitid);
2599         if (!p1) {
2600                 usb_audio_err(state->chip, "unit %d not found!\n", unitid);
2601                 return -EINVAL;
2602         }
2603
2604         if (protocol == UAC_VERSION_1 || protocol == UAC_VERSION_2) {
2605                 switch (p1[2]) {
2606                 case UAC_INPUT_TERMINAL:
2607                         return parse_audio_input_terminal(state, unitid, p1);
2608                 case UAC_MIXER_UNIT:
2609                         return parse_audio_mixer_unit(state, unitid, p1);
2610                 case UAC2_CLOCK_SOURCE:
2611                         return parse_clock_source_unit(state, unitid, p1);
2612                 case UAC_SELECTOR_UNIT:
2613                 case UAC2_CLOCK_SELECTOR:
2614                         return parse_audio_selector_unit(state, unitid, p1);
2615                 case UAC_FEATURE_UNIT:
2616                         return parse_audio_feature_unit(state, unitid, p1);
2617                 case UAC1_PROCESSING_UNIT:
2618                 /*   UAC2_EFFECT_UNIT has the same value */
2619                         if (protocol == UAC_VERSION_1)
2620                                 return parse_audio_processing_unit(state, unitid, p1);
2621                         else
2622                                 return 0; /* FIXME - effect units not implemented yet */
2623                 case UAC1_EXTENSION_UNIT:
2624                 /*   UAC2_PROCESSING_UNIT_V2 has the same value */
2625                         if (protocol == UAC_VERSION_1)
2626                                 return parse_audio_extension_unit(state, unitid, p1);
2627                         else /* UAC_VERSION_2 */
2628                                 return parse_audio_processing_unit(state, unitid, p1);
2629                 case UAC2_EXTENSION_UNIT_V2:
2630                         return parse_audio_extension_unit(state, unitid, p1);
2631                 default:
2632                         usb_audio_err(state->chip,
2633                                 "unit %u: unexpected type 0x%02x\n", unitid, p1[2]);
2634                         return -EINVAL;
2635                 }
2636         } else { /* UAC_VERSION_3 */
2637                 switch (p1[2]) {
2638                 case UAC_INPUT_TERMINAL:
2639                         return parse_audio_input_terminal(state, unitid, p1);
2640                 case UAC3_MIXER_UNIT:
2641                         return parse_audio_mixer_unit(state, unitid, p1);
2642                 case UAC3_CLOCK_SOURCE:
2643                         return parse_clock_source_unit(state, unitid, p1);
2644                 case UAC3_CLOCK_SELECTOR:
2645                         return parse_audio_selector_unit(state, unitid, p1);
2646                 case UAC3_FEATURE_UNIT:
2647                         return parse_audio_feature_unit(state, unitid, p1);
2648                 case UAC3_EFFECT_UNIT:
2649                         return 0; /* FIXME - effect units not implemented yet */
2650                 case UAC3_PROCESSING_UNIT:
2651                         return parse_audio_processing_unit(state, unitid, p1);
2652                 case UAC3_EXTENSION_UNIT:
2653                         return parse_audio_extension_unit(state, unitid, p1);
2654                 default:
2655                         usb_audio_err(state->chip,
2656                                 "unit %u: unexpected type 0x%02x\n", unitid, p1[2]);
2657                         return -EINVAL;
2658                 }
2659         }
2660 }
2661
2662 static void snd_usb_mixer_free(struct usb_mixer_interface *mixer)
2663 {
2664         /* kill pending URBs */
2665         snd_usb_mixer_disconnect(mixer);
2666
2667         kfree(mixer->id_elems);
2668         if (mixer->urb) {
2669                 kfree(mixer->urb->transfer_buffer);
2670                 usb_free_urb(mixer->urb);
2671         }
2672         usb_free_urb(mixer->rc_urb);
2673         kfree(mixer->rc_setup_packet);
2674         kfree(mixer);
2675 }
2676
2677 static int snd_usb_mixer_dev_free(struct snd_device *device)
2678 {
2679         struct usb_mixer_interface *mixer = device->device_data;
2680         snd_usb_mixer_free(mixer);
2681         return 0;
2682 }
2683
2684 /* UAC3 predefined channels configuration */
2685 struct uac3_badd_profile {
2686         int subclass;
2687         const char *name;
2688         int c_chmask;   /* capture channels mask */
2689         int p_chmask;   /* playback channels mask */
2690         int st_chmask;  /* side tone mixing channel mask */
2691 };
2692
2693 static struct uac3_badd_profile uac3_badd_profiles[] = {
2694         {
2695                 /*
2696                  * BAIF, BAOF or combination of both
2697                  * IN: Mono or Stereo cfg, Mono alt possible
2698                  * OUT: Mono or Stereo cfg, Mono alt possible
2699                  */
2700                 .subclass = UAC3_FUNCTION_SUBCLASS_GENERIC_IO,
2701                 .name = "GENERIC IO",
2702                 .c_chmask = -1,         /* dynamic channels */
2703                 .p_chmask = -1,         /* dynamic channels */
2704         },
2705         {
2706                 /* BAOF; Stereo only cfg, Mono alt possible */
2707                 .subclass = UAC3_FUNCTION_SUBCLASS_HEADPHONE,
2708                 .name = "HEADPHONE",
2709                 .p_chmask = 3,
2710         },
2711         {
2712                 /* BAOF; Mono or Stereo cfg, Mono alt possible */
2713                 .subclass = UAC3_FUNCTION_SUBCLASS_SPEAKER,
2714                 .name = "SPEAKER",
2715                 .p_chmask = -1,         /* dynamic channels */
2716         },
2717         {
2718                 /* BAIF; Mono or Stereo cfg, Mono alt possible */
2719                 .subclass = UAC3_FUNCTION_SUBCLASS_MICROPHONE,
2720                 .name = "MICROPHONE",
2721                 .c_chmask = -1,         /* dynamic channels */
2722         },
2723         {
2724                 /*
2725                  * BAIOF topology
2726                  * IN: Mono only
2727                  * OUT: Mono or Stereo cfg, Mono alt possible
2728                  */
2729                 .subclass = UAC3_FUNCTION_SUBCLASS_HEADSET,
2730                 .name = "HEADSET",
2731                 .c_chmask = 1,
2732                 .p_chmask = -1,         /* dynamic channels */
2733                 .st_chmask = 1,
2734         },
2735         {
2736                 /* BAIOF; IN: Mono only; OUT: Stereo only, Mono alt possible */
2737                 .subclass = UAC3_FUNCTION_SUBCLASS_HEADSET_ADAPTER,
2738                 .name = "HEADSET ADAPTER",
2739                 .c_chmask = 1,
2740                 .p_chmask = 3,
2741                 .st_chmask = 1,
2742         },
2743         {
2744                 /* BAIF + BAOF; IN: Mono only; OUT: Mono only */
2745                 .subclass = UAC3_FUNCTION_SUBCLASS_SPEAKERPHONE,
2746                 .name = "SPEAKERPHONE",
2747                 .c_chmask = 1,
2748                 .p_chmask = 1,
2749         },
2750         { 0 } /* terminator */
2751 };
2752
2753 static bool uac3_badd_func_has_valid_channels(struct usb_mixer_interface *mixer,
2754                                               struct uac3_badd_profile *f,
2755                                               int c_chmask, int p_chmask)
2756 {
2757         /*
2758          * If both playback/capture channels are dynamic, make sure
2759          * at least one channel is present
2760          */
2761         if (f->c_chmask < 0 && f->p_chmask < 0) {
2762                 if (!c_chmask && !p_chmask) {
2763                         usb_audio_warn(mixer->chip, "BAAD %s: no channels?",
2764                                        f->name);
2765                         return false;
2766                 }
2767                 return true;
2768         }
2769
2770         if ((f->c_chmask < 0 && !c_chmask) ||
2771             (f->c_chmask >= 0 && f->c_chmask != c_chmask)) {
2772                 usb_audio_warn(mixer->chip, "BAAD %s c_chmask mismatch",
2773                                f->name);
2774                 return false;
2775         }
2776         if ((f->p_chmask < 0 && !p_chmask) ||
2777             (f->p_chmask >= 0 && f->p_chmask != p_chmask)) {
2778                 usb_audio_warn(mixer->chip, "BAAD %s p_chmask mismatch",
2779                                f->name);
2780                 return false;
2781         }
2782         return true;
2783 }
2784
2785 /*
2786  * create mixer controls for UAC3 BADD profiles
2787  *
2788  * UAC3 BADD device doesn't contain CS descriptors thus we will guess everything
2789  *
2790  * BADD device may contain Mixer Unit, which doesn't have any controls, skip it
2791  */
2792 static int snd_usb_mixer_controls_badd(struct usb_mixer_interface *mixer,
2793                                        int ctrlif)
2794 {
2795         struct usb_device *dev = mixer->chip->dev;
2796         struct usb_interface_assoc_descriptor *assoc;
2797         int badd_profile = mixer->chip->badd_profile;
2798         struct uac3_badd_profile *f;
2799         const struct usbmix_ctl_map *map;
2800         int p_chmask = 0, c_chmask = 0, st_chmask = 0;
2801         int i;
2802
2803         assoc = usb_ifnum_to_if(dev, ctrlif)->intf_assoc;
2804
2805         /* Detect BADD capture/playback channels from AS EP descriptors */
2806         for (i = 0; i < assoc->bInterfaceCount; i++) {
2807                 int intf = assoc->bFirstInterface + i;
2808
2809                 struct usb_interface *iface;
2810                 struct usb_host_interface *alts;
2811                 struct usb_interface_descriptor *altsd;
2812                 unsigned int maxpacksize;
2813                 char dir_in;
2814                 int chmask, num;
2815
2816                 if (intf == ctrlif)
2817                         continue;
2818
2819                 iface = usb_ifnum_to_if(dev, intf);
2820                 num = iface->num_altsetting;
2821
2822                 if (num < 2)
2823                         return -EINVAL;
2824
2825                 /*
2826                  * The number of Channels in an AudioStreaming interface
2827                  * and the audio sample bit resolution (16 bits or 24
2828                  * bits) can be derived from the wMaxPacketSize field in
2829                  * the Standard AS Audio Data Endpoint descriptor in
2830                  * Alternate Setting 1
2831                  */
2832                 alts = &iface->altsetting[1];
2833                 altsd = get_iface_desc(alts);
2834
2835                 if (altsd->bNumEndpoints < 1)
2836                         return -EINVAL;
2837
2838                 /* check direction */
2839                 dir_in = (get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN);
2840                 maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
2841
2842                 switch (maxpacksize) {
2843                 default:
2844                         usb_audio_err(mixer->chip,
2845                                 "incorrect wMaxPacketSize 0x%x for BADD profile\n",
2846                                 maxpacksize);
2847                         return -EINVAL;
2848                 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_16:
2849                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_16:
2850                 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_24:
2851                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_24:
2852                         chmask = 1;
2853                         break;
2854                 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_16:
2855                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_16:
2856                 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_24:
2857                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_24:
2858                         chmask = 3;
2859                         break;
2860                 }
2861
2862                 if (dir_in)
2863                         c_chmask = chmask;
2864                 else
2865                         p_chmask = chmask;
2866         }
2867
2868         usb_audio_dbg(mixer->chip,
2869                 "UAC3 BADD profile 0x%x: detected c_chmask=%d p_chmask=%d\n",
2870                 badd_profile, c_chmask, p_chmask);
2871
2872         /* check the mapping table */
2873         for (map = uac3_badd_usbmix_ctl_maps; map->id; map++) {
2874                 if (map->id == badd_profile)
2875                         break;
2876         }
2877
2878         if (!map->id)
2879                 return -EINVAL;
2880
2881         for (f = uac3_badd_profiles; f->name; f++) {
2882                 if (badd_profile == f->subclass)
2883                         break;
2884         }
2885         if (!f->name)
2886                 return -EINVAL;
2887         if (!uac3_badd_func_has_valid_channels(mixer, f, c_chmask, p_chmask))
2888                 return -EINVAL;
2889         st_chmask = f->st_chmask;
2890
2891         /* Playback */
2892         if (p_chmask) {
2893                 /* Master channel, always writable */
2894                 build_feature_ctl_badd(mixer, 0, UAC_FU_MUTE,
2895                                        UAC3_BADD_FU_ID2, map->map);
2896                 /* Mono/Stereo volume channels, always writable */
2897                 build_feature_ctl_badd(mixer, p_chmask, UAC_FU_VOLUME,
2898                                        UAC3_BADD_FU_ID2, map->map);
2899         }
2900
2901         /* Capture */
2902         if (c_chmask) {
2903                 /* Master channel, always writable */
2904                 build_feature_ctl_badd(mixer, 0, UAC_FU_MUTE,
2905                                        UAC3_BADD_FU_ID5, map->map);
2906                 /* Mono/Stereo volume channels, always writable */
2907                 build_feature_ctl_badd(mixer, c_chmask, UAC_FU_VOLUME,
2908                                        UAC3_BADD_FU_ID5, map->map);
2909         }
2910
2911         /* Side tone-mixing */
2912         if (st_chmask) {
2913                 /* Master channel, always writable */
2914                 build_feature_ctl_badd(mixer, 0, UAC_FU_MUTE,
2915                                        UAC3_BADD_FU_ID7, map->map);
2916                 /* Mono volume channel, always writable */
2917                 build_feature_ctl_badd(mixer, 1, UAC_FU_VOLUME,
2918                                        UAC3_BADD_FU_ID7, map->map);
2919         }
2920
2921         /* Insertion Control */
2922         if (f->subclass == UAC3_FUNCTION_SUBCLASS_HEADSET_ADAPTER) {
2923                 struct usb_audio_term iterm, oterm;
2924
2925                 /* Input Term - Insertion control */
2926                 memset(&iterm, 0, sizeof(iterm));
2927                 iterm.id = UAC3_BADD_IT_ID4;
2928                 iterm.type = UAC_BIDIR_TERMINAL_HEADSET;
2929                 build_connector_control(mixer, &iterm, true);
2930
2931                 /* Output Term - Insertion control */
2932                 memset(&oterm, 0, sizeof(oterm));
2933                 oterm.id = UAC3_BADD_OT_ID3;
2934                 oterm.type = UAC_BIDIR_TERMINAL_HEADSET;
2935                 build_connector_control(mixer, &oterm, false);
2936         }
2937
2938         return 0;
2939 }
2940
2941 /*
2942  * create mixer controls
2943  *
2944  * walk through all UAC_OUTPUT_TERMINAL descriptors to search for mixers
2945  */
2946 static int snd_usb_mixer_controls(struct usb_mixer_interface *mixer)
2947 {
2948         struct mixer_build state;
2949         int err;
2950         const struct usbmix_ctl_map *map;
2951         void *p;
2952
2953         memset(&state, 0, sizeof(state));
2954         state.chip = mixer->chip;
2955         state.mixer = mixer;
2956         state.buffer = mixer->hostif->extra;
2957         state.buflen = mixer->hostif->extralen;
2958
2959         /* check the mapping table */
2960         for (map = usbmix_ctl_maps; map->id; map++) {
2961                 if (map->id == state.chip->usb_id) {
2962                         state.map = map->map;
2963                         state.selector_map = map->selector_map;
2964                         mixer->ignore_ctl_error = map->ignore_ctl_error;
2965                         break;
2966                 }
2967         }
2968
2969         p = NULL;
2970         while ((p = snd_usb_find_csint_desc(mixer->hostif->extra,
2971                                             mixer->hostif->extralen,
2972                                             p, UAC_OUTPUT_TERMINAL)) != NULL) {
2973                 if (mixer->protocol == UAC_VERSION_1) {
2974                         struct uac1_output_terminal_descriptor *desc = p;
2975
2976                         if (desc->bLength < sizeof(*desc))
2977                                 continue; /* invalid descriptor? */
2978                         /* mark terminal ID as visited */
2979                         set_bit(desc->bTerminalID, state.unitbitmap);
2980                         state.oterm.id = desc->bTerminalID;
2981                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
2982                         state.oterm.name = desc->iTerminal;
2983                         err = parse_audio_unit(&state, desc->bSourceID);
2984                         if (err < 0 && err != -EINVAL)
2985                                 return err;
2986                 } else if (mixer->protocol == UAC_VERSION_2) {
2987                         struct uac2_output_terminal_descriptor *desc = p;
2988
2989                         if (desc->bLength < sizeof(*desc))
2990                                 continue; /* invalid descriptor? */
2991                         /* mark terminal ID as visited */
2992                         set_bit(desc->bTerminalID, state.unitbitmap);
2993                         state.oterm.id = desc->bTerminalID;
2994                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
2995                         state.oterm.name = desc->iTerminal;
2996                         err = parse_audio_unit(&state, desc->bSourceID);
2997                         if (err < 0 && err != -EINVAL)
2998                                 return err;
2999
3000                         /*
3001                          * For UAC2, use the same approach to also add the
3002                          * clock selectors
3003                          */
3004                         err = parse_audio_unit(&state, desc->bCSourceID);
3005                         if (err < 0 && err != -EINVAL)
3006                                 return err;
3007
3008                         if (uac_v2v3_control_is_readable(le16_to_cpu(desc->bmControls),
3009                                                          UAC2_TE_CONNECTOR)) {
3010                                 build_connector_control(state.mixer, &state.oterm,
3011                                                         false);
3012                         }
3013                 } else {  /* UAC_VERSION_3 */
3014                         struct uac3_output_terminal_descriptor *desc = p;
3015
3016                         if (desc->bLength < sizeof(*desc))
3017                                 continue; /* invalid descriptor? */
3018                         /* mark terminal ID as visited */
3019                         set_bit(desc->bTerminalID, state.unitbitmap);
3020                         state.oterm.id = desc->bTerminalID;
3021                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
3022                         state.oterm.name = le16_to_cpu(desc->wTerminalDescrStr);
3023                         err = parse_audio_unit(&state, desc->bSourceID);
3024                         if (err < 0 && err != -EINVAL)
3025                                 return err;
3026
3027                         /*
3028                          * For UAC3, use the same approach to also add the
3029                          * clock selectors
3030                          */
3031                         err = parse_audio_unit(&state, desc->bCSourceID);
3032                         if (err < 0 && err != -EINVAL)
3033                                 return err;
3034
3035                         if (uac_v2v3_control_is_readable(le32_to_cpu(desc->bmControls),
3036                                                          UAC3_TE_INSERTION)) {
3037                                 build_connector_control(state.mixer, &state.oterm,
3038                                                         false);
3039                         }
3040                 }
3041         }
3042
3043         return 0;
3044 }
3045
3046 void snd_usb_mixer_notify_id(struct usb_mixer_interface *mixer, int unitid)
3047 {
3048         struct usb_mixer_elem_list *list;
3049
3050         for_each_mixer_elem(list, mixer, unitid) {
3051                 struct usb_mixer_elem_info *info =
3052                         mixer_elem_list_to_info(list);
3053                 /* invalidate cache, so the value is read from the device */
3054                 info->cached = 0;
3055                 snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
3056                                &list->kctl->id);
3057         }
3058 }
3059
3060 static void snd_usb_mixer_dump_cval(struct snd_info_buffer *buffer,
3061                                     struct usb_mixer_elem_list *list)
3062 {
3063         struct usb_mixer_elem_info *cval = mixer_elem_list_to_info(list);
3064         static char *val_types[] = {"BOOLEAN", "INV_BOOLEAN",
3065                                     "S8", "U8", "S16", "U16"};
3066         snd_iprintf(buffer, "    Info: id=%i, control=%i, cmask=0x%x, "
3067                             "channels=%i, type=\"%s\"\n", cval->head.id,
3068                             cval->control, cval->cmask, cval->channels,
3069                             val_types[cval->val_type]);
3070         snd_iprintf(buffer, "    Volume: min=%i, max=%i, dBmin=%i, dBmax=%i\n",
3071                             cval->min, cval->max, cval->dBmin, cval->dBmax);
3072 }
3073
3074 static void snd_usb_mixer_proc_read(struct snd_info_entry *entry,
3075                                     struct snd_info_buffer *buffer)
3076 {
3077         struct snd_usb_audio *chip = entry->private_data;
3078         struct usb_mixer_interface *mixer;
3079         struct usb_mixer_elem_list *list;
3080         int unitid;
3081
3082         list_for_each_entry(mixer, &chip->mixer_list, list) {
3083                 snd_iprintf(buffer,
3084                         "USB Mixer: usb_id=0x%08x, ctrlif=%i, ctlerr=%i\n",
3085                                 chip->usb_id, snd_usb_ctrl_intf(chip),
3086                                 mixer->ignore_ctl_error);
3087                 snd_iprintf(buffer, "Card: %s\n", chip->card->longname);
3088                 for (unitid = 0; unitid < MAX_ID_ELEMS; unitid++) {
3089                         for_each_mixer_elem(list, mixer, unitid) {
3090                                 snd_iprintf(buffer, "  Unit: %i\n", list->id);
3091                                 if (list->kctl)
3092                                         snd_iprintf(buffer,
3093                                                     "    Control: name=\"%s\", index=%i\n",
3094                                                     list->kctl->id.name,
3095                                                     list->kctl->id.index);
3096                                 if (list->dump)
3097                                         list->dump(buffer, list);
3098                         }
3099                 }
3100         }
3101 }
3102
3103 static void snd_usb_mixer_interrupt_v2(struct usb_mixer_interface *mixer,
3104                                        int attribute, int value, int index)
3105 {
3106         struct usb_mixer_elem_list *list;
3107         __u8 unitid = (index >> 8) & 0xff;
3108         __u8 control = (value >> 8) & 0xff;
3109         __u8 channel = value & 0xff;
3110         unsigned int count = 0;
3111
3112         if (channel >= MAX_CHANNELS) {
3113                 usb_audio_dbg(mixer->chip,
3114                         "%s(): bogus channel number %d\n",
3115                         __func__, channel);
3116                 return;
3117         }
3118
3119         for_each_mixer_elem(list, mixer, unitid)
3120                 count++;
3121
3122         if (count == 0)
3123                 return;
3124
3125         for_each_mixer_elem(list, mixer, unitid) {
3126                 struct usb_mixer_elem_info *info;
3127
3128                 if (!list->kctl)
3129                         continue;
3130
3131                 info = mixer_elem_list_to_info(list);
3132                 if (count > 1 && info->control != control)
3133                         continue;
3134
3135                 switch (attribute) {
3136                 case UAC2_CS_CUR:
3137                         /* invalidate cache, so the value is read from the device */
3138                         if (channel)
3139                                 info->cached &= ~(1 << channel);
3140                         else /* master channel */
3141                                 info->cached = 0;
3142
3143                         snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
3144                                        &info->head.kctl->id);
3145                         break;
3146
3147                 case UAC2_CS_RANGE:
3148                         /* TODO */
3149                         break;
3150
3151                 case UAC2_CS_MEM:
3152                         /* TODO */
3153                         break;
3154
3155                 default:
3156                         usb_audio_dbg(mixer->chip,
3157                                 "unknown attribute %d in interrupt\n",
3158                                 attribute);
3159                         break;
3160                 } /* switch */
3161         }
3162 }
3163
3164 static void snd_usb_mixer_interrupt(struct urb *urb)
3165 {
3166         struct usb_mixer_interface *mixer = urb->context;
3167         int len = urb->actual_length;
3168         int ustatus = urb->status;
3169
3170         if (ustatus != 0)
3171                 goto requeue;
3172
3173         if (mixer->protocol == UAC_VERSION_1) {
3174                 struct uac1_status_word *status;
3175
3176                 for (status = urb->transfer_buffer;
3177                      len >= sizeof(*status);
3178                      len -= sizeof(*status), status++) {
3179                         dev_dbg(&urb->dev->dev, "status interrupt: %02x %02x\n",
3180                                                 status->bStatusType,
3181                                                 status->bOriginator);
3182
3183                         /* ignore any notifications not from the control interface */
3184                         if ((status->bStatusType & UAC1_STATUS_TYPE_ORIG_MASK) !=
3185                                 UAC1_STATUS_TYPE_ORIG_AUDIO_CONTROL_IF)
3186                                 continue;
3187
3188                         if (status->bStatusType & UAC1_STATUS_TYPE_MEM_CHANGED)
3189                                 snd_usb_mixer_rc_memory_change(mixer, status->bOriginator);
3190                         else
3191                                 snd_usb_mixer_notify_id(mixer, status->bOriginator);
3192                 }
3193         } else { /* UAC_VERSION_2 */
3194                 struct uac2_interrupt_data_msg *msg;
3195
3196                 for (msg = urb->transfer_buffer;
3197                      len >= sizeof(*msg);
3198                      len -= sizeof(*msg), msg++) {
3199                         /* drop vendor specific and endpoint requests */
3200                         if ((msg->bInfo & UAC2_INTERRUPT_DATA_MSG_VENDOR) ||
3201                             (msg->bInfo & UAC2_INTERRUPT_DATA_MSG_EP))
3202                                 continue;
3203
3204                         snd_usb_mixer_interrupt_v2(mixer, msg->bAttribute,
3205                                                    le16_to_cpu(msg->wValue),
3206                                                    le16_to_cpu(msg->wIndex));
3207                 }
3208         }
3209
3210 requeue:
3211         if (ustatus != -ENOENT &&
3212             ustatus != -ECONNRESET &&
3213             ustatus != -ESHUTDOWN) {
3214                 urb->dev = mixer->chip->dev;
3215                 usb_submit_urb(urb, GFP_ATOMIC);
3216         }
3217 }
3218
3219 /* create the handler for the optional status interrupt endpoint */
3220 static int snd_usb_mixer_status_create(struct usb_mixer_interface *mixer)
3221 {
3222         struct usb_endpoint_descriptor *ep;
3223         void *transfer_buffer;
3224         int buffer_length;
3225         unsigned int epnum;
3226
3227         /* we need one interrupt input endpoint */
3228         if (get_iface_desc(mixer->hostif)->bNumEndpoints < 1)
3229                 return 0;
3230         ep = get_endpoint(mixer->hostif, 0);
3231         if (!usb_endpoint_dir_in(ep) || !usb_endpoint_xfer_int(ep))
3232                 return 0;
3233
3234         epnum = usb_endpoint_num(ep);
3235         buffer_length = le16_to_cpu(ep->wMaxPacketSize);
3236         transfer_buffer = kmalloc(buffer_length, GFP_KERNEL);
3237         if (!transfer_buffer)
3238                 return -ENOMEM;
3239         mixer->urb = usb_alloc_urb(0, GFP_KERNEL);
3240         if (!mixer->urb) {
3241                 kfree(transfer_buffer);
3242                 return -ENOMEM;
3243         }
3244         usb_fill_int_urb(mixer->urb, mixer->chip->dev,
3245                          usb_rcvintpipe(mixer->chip->dev, epnum),
3246                          transfer_buffer, buffer_length,
3247                          snd_usb_mixer_interrupt, mixer, ep->bInterval);
3248         usb_submit_urb(mixer->urb, GFP_KERNEL);
3249         return 0;
3250 }
3251
3252 static int keep_iface_ctl_get(struct snd_kcontrol *kcontrol,
3253                               struct snd_ctl_elem_value *ucontrol)
3254 {
3255         struct usb_mixer_interface *mixer = snd_kcontrol_chip(kcontrol);
3256
3257         ucontrol->value.integer.value[0] = mixer->chip->keep_iface;
3258         return 0;
3259 }
3260
3261 static int keep_iface_ctl_put(struct snd_kcontrol *kcontrol,
3262                               struct snd_ctl_elem_value *ucontrol)
3263 {
3264         struct usb_mixer_interface *mixer = snd_kcontrol_chip(kcontrol);
3265         bool keep_iface = !!ucontrol->value.integer.value[0];
3266
3267         if (mixer->chip->keep_iface == keep_iface)
3268                 return 0;
3269         mixer->chip->keep_iface = keep_iface;
3270         return 1;
3271 }
3272
3273 static const struct snd_kcontrol_new keep_iface_ctl = {
3274         .iface = SNDRV_CTL_ELEM_IFACE_CARD,
3275         .name = "Keep Interface",
3276         .info = snd_ctl_boolean_mono_info,
3277         .get = keep_iface_ctl_get,
3278         .put = keep_iface_ctl_put,
3279 };
3280
3281 static int create_keep_iface_ctl(struct usb_mixer_interface *mixer)
3282 {
3283         struct snd_kcontrol *kctl = snd_ctl_new1(&keep_iface_ctl, mixer);
3284
3285         /* need only one control per card */
3286         if (snd_ctl_find_id(mixer->chip->card, &kctl->id)) {
3287                 snd_ctl_free_one(kctl);
3288                 return 0;
3289         }
3290
3291         return snd_ctl_add(mixer->chip->card, kctl);
3292 }
3293
3294 int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif,
3295                          int ignore_error)
3296 {
3297         static struct snd_device_ops dev_ops = {
3298                 .dev_free = snd_usb_mixer_dev_free
3299         };
3300         struct usb_mixer_interface *mixer;
3301         struct snd_info_entry *entry;
3302         int err;
3303
3304         strcpy(chip->card->mixername, "USB Mixer");
3305
3306         mixer = kzalloc(sizeof(*mixer), GFP_KERNEL);
3307         if (!mixer)
3308                 return -ENOMEM;
3309         mixer->chip = chip;
3310         mixer->ignore_ctl_error = ignore_error;
3311         mixer->id_elems = kcalloc(MAX_ID_ELEMS, sizeof(*mixer->id_elems),
3312                                   GFP_KERNEL);
3313         if (!mixer->id_elems) {
3314                 kfree(mixer);
3315                 return -ENOMEM;
3316         }
3317
3318         mixer->hostif = &usb_ifnum_to_if(chip->dev, ctrlif)->altsetting[0];
3319         switch (get_iface_desc(mixer->hostif)->bInterfaceProtocol) {
3320         case UAC_VERSION_1:
3321         default:
3322                 mixer->protocol = UAC_VERSION_1;
3323                 break;
3324         case UAC_VERSION_2:
3325                 mixer->protocol = UAC_VERSION_2;
3326                 break;
3327         case UAC_VERSION_3:
3328                 mixer->protocol = UAC_VERSION_3;
3329                 break;
3330         }
3331
3332         if (mixer->protocol == UAC_VERSION_3 &&
3333                         chip->badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) {
3334                 err = snd_usb_mixer_controls_badd(mixer, ctrlif);
3335                 if (err < 0)
3336                         goto _error;
3337         } else {
3338                 err = snd_usb_mixer_controls(mixer);
3339                 if (err < 0)
3340                         goto _error;
3341                 err = snd_usb_mixer_status_create(mixer);
3342                 if (err < 0)
3343                         goto _error;
3344         }
3345         err = create_keep_iface_ctl(mixer);
3346         if (err < 0)
3347                 goto _error;
3348
3349         snd_usb_mixer_apply_create_quirk(mixer);
3350
3351         err = snd_device_new(chip->card, SNDRV_DEV_CODEC, mixer, &dev_ops);
3352         if (err < 0)
3353                 goto _error;
3354
3355         if (list_empty(&chip->mixer_list) &&
3356             !snd_card_proc_new(chip->card, "usbmixer", &entry))
3357                 snd_info_set_text_ops(entry, chip, snd_usb_mixer_proc_read);
3358
3359         list_add(&mixer->list, &chip->mixer_list);
3360         return 0;
3361
3362 _error:
3363         snd_usb_mixer_free(mixer);
3364         return err;
3365 }
3366
3367 void snd_usb_mixer_disconnect(struct usb_mixer_interface *mixer)
3368 {
3369         if (mixer->disconnected)
3370                 return;
3371         if (mixer->urb)
3372                 usb_kill_urb(mixer->urb);
3373         if (mixer->rc_urb)
3374                 usb_kill_urb(mixer->rc_urb);
3375         mixer->disconnected = true;
3376 }
3377
3378 #ifdef CONFIG_PM
3379 /* stop any bus activity of a mixer */
3380 static void snd_usb_mixer_inactivate(struct usb_mixer_interface *mixer)
3381 {
3382         usb_kill_urb(mixer->urb);
3383         usb_kill_urb(mixer->rc_urb);
3384 }
3385
3386 static int snd_usb_mixer_activate(struct usb_mixer_interface *mixer)
3387 {
3388         int err;
3389
3390         if (mixer->urb) {
3391                 err = usb_submit_urb(mixer->urb, GFP_NOIO);
3392                 if (err < 0)
3393                         return err;
3394         }
3395
3396         return 0;
3397 }
3398
3399 int snd_usb_mixer_suspend(struct usb_mixer_interface *mixer)
3400 {
3401         snd_usb_mixer_inactivate(mixer);
3402         return 0;
3403 }
3404
3405 static int restore_mixer_value(struct usb_mixer_elem_list *list)
3406 {
3407         struct usb_mixer_elem_info *cval = mixer_elem_list_to_info(list);
3408         int c, err, idx;
3409
3410         if (cval->cmask) {
3411                 idx = 0;
3412                 for (c = 0; c < MAX_CHANNELS; c++) {
3413                         if (!(cval->cmask & (1 << c)))
3414                                 continue;
3415                         if (cval->cached & (1 << (c + 1))) {
3416                                 err = snd_usb_set_cur_mix_value(cval, c + 1, idx,
3417                                                         cval->cache_val[idx]);
3418                                 if (err < 0)
3419                                         return err;
3420                         }
3421                         idx++;
3422                 }
3423         } else {
3424                 /* master */
3425                 if (cval->cached) {
3426                         err = snd_usb_set_cur_mix_value(cval, 0, 0, *cval->cache_val);
3427                         if (err < 0)
3428                                 return err;
3429                 }
3430         }
3431
3432         return 0;
3433 }
3434
3435 int snd_usb_mixer_resume(struct usb_mixer_interface *mixer, bool reset_resume)
3436 {
3437         struct usb_mixer_elem_list *list;
3438         int id, err;
3439
3440         if (reset_resume) {
3441                 /* restore cached mixer values */
3442                 for (id = 0; id < MAX_ID_ELEMS; id++) {
3443                         for_each_mixer_elem(list, mixer, id) {
3444                                 if (list->resume) {
3445                                         err = list->resume(list);
3446                                         if (err < 0)
3447                                                 return err;
3448                                 }
3449                         }
3450                 }
3451         }
3452
3453         snd_usb_mixer_resume_quirk(mixer);
3454
3455         return snd_usb_mixer_activate(mixer);
3456 }
3457 #endif
3458
3459 void snd_usb_mixer_elem_init_std(struct usb_mixer_elem_list *list,
3460                                  struct usb_mixer_interface *mixer,
3461                                  int unitid)
3462 {
3463         list->mixer = mixer;
3464         list->id = unitid;
3465         list->dump = snd_usb_mixer_dump_cval;
3466 #ifdef CONFIG_PM
3467         list->resume = restore_mixer_value;
3468 #endif
3469 }