sound/usb/mixer.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *   (Tentative) USB Audio Driver for ALSA
   4  *
   5  *   Mixer control part
   6  *
   7  *   Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
   8  *
   9  *   Many codes borrowed from audio.c by
  10  *          Alan Cox (alan@lxorguk.ukuu.org.uk)
  11  *          Thomas Sailer (sailer@ife.ee.ethz.ch)
  12  */
  13
  14 /*
  15  * TODOs, for both the mixer and the streaming interfaces:
  16  *
  17  *  - support for UAC2 effect units
  18  *  - support for graphical equalizers
  19  *  - RANGE and MEM set commands (UAC2)
  20  *  - RANGE and MEM interrupt dispatchers (UAC2)
  21  *  - audio channel clustering (UAC2)
  22  *  - audio sample rate converter units (UAC2)
  23  *  - proper handling of clock multipliers (UAC2)
  24  *  - dispatch clock change notifications (UAC2)
  25  *      - stop PCM streams which use a clock that became invalid
  26  *      - stop PCM streams which use a clock selector that has changed
  27  *      - parse available sample rates again when clock sources changed
  28  */
  29
  30 #include <linux/bitops.h>
  31 #include <linux/init.h>
  32 #include <linux/list.h>
  33 #include <linux/log2.h>
  34 #include <linux/slab.h>
  35 #include <linux/string.h>
  36 #include <linux/usb.h>
  37 #include <linux/usb/audio.h>
  38 #include <linux/usb/audio-v2.h>
  39 #include <linux/usb/audio-v3.h>
  40
  41 #include <sound/core.h>
  42 #include <sound/control.h>
  43 #include <sound/hwdep.h>
  44 #include <sound/info.h>
  45 #include <sound/tlv.h>
  46
  47 #include "usbaudio.h"
  48 #include "mixer.h"
  49 #include "helper.h"
  50 #include "mixer_quirks.h"
  51 #include "power.h"
  52
  53 #define MAX_ID_ELEMS    256
  54
  55 struct usb_audio_term {
  56         int id;
  57         int type;
  58         int channels;
  59         unsigned int chconfig;
  60         int name;
  61 };
  62
  63 struct usbmix_name_map;
  64
  65 struct mixer_build {
  66         struct snd_usb_audio *chip;
  67         struct usb_mixer_interface *mixer;
  68         unsigned char *buffer;
  69         unsigned int buflen;
  70         DECLARE_BITMAP(unitbitmap, MAX_ID_ELEMS);
  71         DECLARE_BITMAP(termbitmap, MAX_ID_ELEMS);
  72         struct usb_audio_term oterm;
  73         const struct usbmix_name_map *map;
  74         const struct usbmix_selector_map *selector_map;
  75 };
  76
  77 /*E-mu 0202/0404/0204 eXtension Unit(XU) control*/
  78 enum {
  79         USB_XU_CLOCK_RATE               = 0xe301,
  80         USB_XU_CLOCK_SOURCE             = 0xe302,
  81         USB_XU_DIGITAL_IO_STATUS        = 0xe303,
  82         USB_XU_DEVICE_OPTIONS           = 0xe304,
  83         USB_XU_DIRECT_MONITORING        = 0xe305,
  84         USB_XU_METERING                 = 0xe306
  85 };
  86 enum {
  87         USB_XU_CLOCK_SOURCE_SELECTOR = 0x02,    /* clock source*/
  88         USB_XU_CLOCK_RATE_SELECTOR = 0x03,      /* clock rate */
  89         USB_XU_DIGITAL_FORMAT_SELECTOR = 0x01,  /* the spdif format */
  90         USB_XU_SOFT_LIMIT_SELECTOR = 0x03       /* soft limiter */
  91 };
  92
  93 /*
  94  * manual mapping of mixer names
  95  * if the mixer topology is too complicated and the parsed names are
  96  * ambiguous, add the entries in usbmixer_maps.c.
  97  */
  98 #include "mixer_maps.c"
  99
 100 static const struct usbmix_name_map *
 101 find_map(const struct usbmix_name_map *p, int unitid, int control)
 102 {
 103         if (!p)
 104                 return NULL;
 105
 106         for (; p->id; p++) {
 107                 if (p->id == unitid &&
 108                     (!control || !p->control || control == p->control))
 109                         return p;
 110         }
 111         return NULL;
 112 }
 113
 114 /* get the mapped name if the unit matches */
 115 static int
 116 check_mapped_name(const struct usbmix_name_map *p, char *buf, int buflen)
 117 {
 118         int len;
 119
 120         if (!p || !p->name)
 121                 return 0;
 122
 123         buflen--;
 124         len = strscpy(buf, p->name, buflen);
 125         return len < 0 ? buflen : len;
 126 }
 127
 128 /* ignore the error value if ignore_ctl_error flag is set */
 129 #define filter_error(cval, err) \
 130         ((cval)->head.mixer->ignore_ctl_error ? 0 : (err))
 131
 132 /* check whether the control should be ignored */
 133 static inline int
 134 check_ignored_ctl(const struct usbmix_name_map *p)
 135 {
 136         if (!p || p->name || p->dB)
 137                 return 0;
 138         return 1;
 139 }
 140
 141 /* dB mapping */
 142 static inline void check_mapped_dB(const struct usbmix_name_map *p,
 143                                    struct usb_mixer_elem_info *cval)
 144 {
 145         if (p && p->dB) {
 146                 cval->dBmin = p->dB->min;
 147                 cval->dBmax = p->dB->max;
 148                 cval->initialized = 1;
 149         }
 150 }
 151
 152 /* get the mapped selector source name */
 153 static int check_mapped_selector_name(struct mixer_build *state, int unitid,
 154                                       int index, char *buf, int buflen)
 155 {
 156         const struct usbmix_selector_map *p;
 157         int len;
 158
 159         if (!state->selector_map)
 160                 return 0;
 161         for (p = state->selector_map; p->id; p++) {
 162                 if (p->id == unitid && index < p->count) {
 163                         len = strscpy(buf, p->names[index], buflen);
 164                         return len < 0 ? buflen : len;
 165                 }
 166         }
 167         return 0;
 168 }
 169
 170 /*
 171  * find an audio control unit with the given unit id
 172  */
 173 static void *find_audio_control_unit(struct mixer_build *state,
 174                                      unsigned char unit)
 175 {
 176         /* we just parse the header */
 177         struct uac_feature_unit_descriptor *hdr = NULL;
 178
 179         while ((hdr = snd_usb_find_desc(state->buffer, state->buflen, hdr,
 180                                         USB_DT_CS_INTERFACE)) != NULL) {
 181                 if (hdr->bLength >= 4 &&
 182                     hdr->bDescriptorSubtype >= UAC_INPUT_TERMINAL &&
 183                     hdr->bDescriptorSubtype <= UAC3_SAMPLE_RATE_CONVERTER &&
 184                     hdr->bUnitID == unit)
 185                         return hdr;
 186         }
 187
 188         return NULL;
 189 }
 190
 191 /*
 192  * copy a string with the given id
 193  */
 194 static int snd_usb_copy_string_desc(struct snd_usb_audio *chip,
 195                                     int index, char *buf, int maxlen)
 196 {
 197         int len = usb_string(chip->dev, index, buf, maxlen - 1);
 198
 199         if (len < 0)
 200                 return 0;
 201
 202         buf[len] = 0;
 203         return len;
 204 }
 205
 206 /*
 207  * convert from the byte/word on usb descriptor to the zero-based integer
 208  */
 209 static int convert_signed_value(struct usb_mixer_elem_info *cval, int val)
 210 {
 211         switch (cval->val_type) {
 212         case USB_MIXER_BOOLEAN:
 213                 return !!val;
 214         case USB_MIXER_INV_BOOLEAN:
 215                 return !val;
 216         case USB_MIXER_U8:
 217                 val &= 0xff;
 218                 break;
 219         case USB_MIXER_S8:
 220                 val &= 0xff;
 221                 if (val >= 0x80)
 222                         val -= 0x100;
 223                 break;
 224         case USB_MIXER_U16:
 225                 val &= 0xffff;
 226                 break;
 227         case USB_MIXER_S16:
 228                 val &= 0xffff;
 229                 if (val >= 0x8000)
 230                         val -= 0x10000;
 231                 break;
 232         }
 233         return val;
 234 }
 235
 236 /*
 237  * convert from the zero-based int to the byte/word for usb descriptor
 238  */
 239 static int convert_bytes_value(struct usb_mixer_elem_info *cval, int val)
 240 {
 241         switch (cval->val_type) {
 242         case USB_MIXER_BOOLEAN:
 243                 return !!val;
 244         case USB_MIXER_INV_BOOLEAN:
 245                 return !val;
 246         case USB_MIXER_S8:
 247         case USB_MIXER_U8:
 248                 return val & 0xff;
 249         case USB_MIXER_S16:
 250         case USB_MIXER_U16:
 251                 return val & 0xffff;
 252         }
 253         return 0; /* not reached */
 254 }
 255
 256 static int get_relative_value(struct usb_mixer_elem_info *cval, int val)
 257 {
 258         if (!cval->res)
 259                 cval->res = 1;
 260         if (val < cval->min)
 261                 return 0;
 262         else if (val >= cval->max)
 263                 return DIV_ROUND_UP(cval->max - cval->min, cval->res);
 264         else
 265                 return (val - cval->min) / cval->res;
 266 }
 267
 268 static int get_abs_value(struct usb_mixer_elem_info *cval, int val)
 269 {
 270         if (val < 0)
 271                 return cval->min;
 272         if (!cval->res)
 273                 cval->res = 1;
 274         val *= cval->res;
 275         val += cval->min;
 276         if (val > cval->max)
 277                 return cval->max;
 278         return val;
 279 }
 280
 281 static int uac2_ctl_value_size(int val_type)
 282 {
 283         switch (val_type) {
 284         case USB_MIXER_S32:
 285         case USB_MIXER_U32:
 286                 return 4;
 287         case USB_MIXER_S16:
 288         case USB_MIXER_U16:
 289                 return 2;
 290         default:
 291                 return 1;
 292         }
 293         return 0; /* unreachable */
 294 }
 295
 296
 297 /*
 298  * retrieve a mixer value
 299  */
 300
 301 static inline int mixer_ctrl_intf(struct usb_mixer_interface *mixer)
 302 {
 303         return get_iface_desc(mixer->hostif)->bInterfaceNumber;
 304 }
 305
 306 static int get_ctl_value_v1(struct usb_mixer_elem_info *cval, int request,
 307                             int validx, int *value_ret)
 308 {
 309         struct snd_usb_audio *chip = cval->head.mixer->chip;
 310         unsigned char buf[2];
 311         int val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
 312         int timeout = 10;
 313         int idx = 0, err;
 314
 315         err = snd_usb_lock_shutdown(chip);
 316         if (err < 0)
 317                 return -EIO;
 318
 319         while (timeout-- > 0) {
 320                 idx = mixer_ctrl_intf(cval->head.mixer) | (cval->head.id << 8);
 321                 err = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), request,
 322                                       USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
 323                                       validx, idx, buf, val_len);
 324                 if (err >= val_len) {
 325                         *value_ret = convert_signed_value(cval, snd_usb_combine_bytes(buf, val_len));
 326                         err = 0;
 327                         goto out;
 328                 } else if (err == -ETIMEDOUT) {
 329                         goto out;
 330                 }
 331         }
 332         usb_audio_dbg(chip,
 333                 "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
 334                 request, validx, idx, cval->val_type);
 335         err = -EINVAL;
 336
 337  out:
 338         snd_usb_unlock_shutdown(chip);
 339         return err;
 340 }
 341
 342 static int get_ctl_value_v2(struct usb_mixer_elem_info *cval, int request,
 343                             int validx, int *value_ret)
 344 {
 345         struct snd_usb_audio *chip = cval->head.mixer->chip;
 346         /* enough space for one range */
 347         unsigned char buf[sizeof(__u16) + 3 * sizeof(__u32)];
 348         unsigned char *val;
 349         int idx = 0, ret, val_size, size;
 350         __u8 bRequest;
 351
 352         val_size = uac2_ctl_value_size(cval->val_type);
 353
 354         if (request == UAC_GET_CUR) {
 355                 bRequest = UAC2_CS_CUR;
 356                 size = val_size;
 357         } else {
 358                 bRequest = UAC2_CS_RANGE;
 359                 size = sizeof(__u16) + 3 * val_size;
 360         }
 361
 362         memset(buf, 0, sizeof(buf));
 363
 364         ret = snd_usb_lock_shutdown(chip) ? -EIO : 0;
 365         if (ret)
 366                 goto error;
 367
 368         idx = mixer_ctrl_intf(cval->head.mixer) | (cval->head.id << 8);
 369         ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), bRequest,
 370                               USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
 371                               validx, idx, buf, size);
 372         snd_usb_unlock_shutdown(chip);
 373
 374         if (ret < 0) {
 375 error:
 376                 usb_audio_err(chip,
 377                         "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
 378                         request, validx, idx, cval->val_type);
 379                 return ret;
 380         }
 381
 382         /* FIXME: how should we handle multiple triplets here? */
 383
 384         switch (request) {
 385         case UAC_GET_CUR:
 386                 val = buf;
 387                 break;
 388         case UAC_GET_MIN:
 389                 val = buf + sizeof(__u16);
 390                 break;
 391         case UAC_GET_MAX:
 392                 val = buf + sizeof(__u16) + val_size;
 393                 break;
 394         case UAC_GET_RES:
 395                 val = buf + sizeof(__u16) + val_size * 2;
 396                 break;
 397         default:
 398                 return -EINVAL;
 399         }
 400
 401         *value_ret = convert_signed_value(cval,
 402                                           snd_usb_combine_bytes(val, val_size));
 403
 404         return 0;
 405 }
 406
 407 static int get_ctl_value(struct usb_mixer_elem_info *cval, int request,
 408                          int validx, int *value_ret)
 409 {
 410         validx += cval->idx_off;
 411
 412         return (cval->head.mixer->protocol == UAC_VERSION_1) ?
 413                 get_ctl_value_v1(cval, request, validx, value_ret) :
 414                 get_ctl_value_v2(cval, request, validx, value_ret);
 415 }
 416
 417 static int get_cur_ctl_value(struct usb_mixer_elem_info *cval,
 418                              int validx, int *value)
 419 {
 420         return get_ctl_value(cval, UAC_GET_CUR, validx, value);
 421 }
 422
 423 /* channel = 0: master, 1 = first channel */
 424 static inline int get_cur_mix_raw(struct usb_mixer_elem_info *cval,
 425                                   int channel, int *value)
 426 {
 427         return get_ctl_value(cval, UAC_GET_CUR,
 428                              (cval->control << 8) | channel,
 429                              value);
 430 }
 431
 432 int snd_usb_get_cur_mix_value(struct usb_mixer_elem_info *cval,
 433                              int channel, int index, int *value)
 434 {
 435         int err;
 436
 437         if (cval->cached & (1 << channel)) {
 438                 *value = cval->cache_val[index];
 439                 return 0;
 440         }
 441         err = get_cur_mix_raw(cval, channel, value);
 442         if (err < 0) {
 443                 if (!cval->head.mixer->ignore_ctl_error)
 444                         usb_audio_dbg(cval->head.mixer->chip,
 445                                 "cannot get current value for control %d ch %d: err = %d\n",
 446                                       cval->control, channel, err);
 447                 return err;
 448         }
 449         cval->cached |= 1 << channel;
 450         cval->cache_val[index] = *value;
 451         return 0;
 452 }
 453
 454 /*
 455  * set a mixer value
 456  */
 457
 458 int snd_usb_mixer_set_ctl_value(struct usb_mixer_elem_info *cval,
 459                                 int request, int validx, int value_set)
 460 {
 461         struct snd_usb_audio *chip = cval->head.mixer->chip;
 462         unsigned char buf[4];
 463         int idx = 0, val_len, err, timeout = 10;
 464
 465         validx += cval->idx_off;
 466
 467
 468         if (cval->head.mixer->protocol == UAC_VERSION_1) {
 469                 val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
 470         } else { /* UAC_VERSION_2/3 */
 471                 val_len = uac2_ctl_value_size(cval->val_type);
 472
 473                 /* FIXME */
 474                 if (request != UAC_SET_CUR) {
 475                         usb_audio_dbg(chip, "RANGE setting not yet supported\n");
 476                         return -EINVAL;
 477                 }
 478
 479                 request = UAC2_CS_CUR;
 480         }
 481
 482         value_set = convert_bytes_value(cval, value_set);
 483         buf[0] = value_set & 0xff;
 484         buf[1] = (value_set >> 8) & 0xff;
 485         buf[2] = (value_set >> 16) & 0xff;
 486         buf[3] = (value_set >> 24) & 0xff;
 487
 488         err = snd_usb_lock_shutdown(chip);
 489         if (err < 0)
 490                 return -EIO;
 491
 492         while (timeout-- > 0) {
 493                 idx = mixer_ctrl_intf(cval->head.mixer) | (cval->head.id << 8);
 494                 err = snd_usb_ctl_msg(chip->dev,
 495                                       usb_sndctrlpipe(chip->dev, 0), request,
 496                                       USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
 497                                       validx, idx, buf, val_len);
 498                 if (err >= 0) {
 499                         err = 0;
 500                         goto out;
 501                 } else if (err == -ETIMEDOUT) {
 502                         goto out;
 503                 }
 504         }
 505         usb_audio_dbg(chip, "cannot set ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d, data = %#x/%#x\n",
 506                       request, validx, idx, cval->val_type, buf[0], buf[1]);
 507         err = -EINVAL;
 508
 509  out:
 510         snd_usb_unlock_shutdown(chip);
 511         return err;
 512 }
 513
 514 static int set_cur_ctl_value(struct usb_mixer_elem_info *cval,
 515                              int validx, int value)
 516 {
 517         return snd_usb_mixer_set_ctl_value(cval, UAC_SET_CUR, validx, value);
 518 }
 519
 520 int snd_usb_set_cur_mix_value(struct usb_mixer_elem_info *cval, int channel,
 521                              int index, int value)
 522 {
 523         int err;
 524         unsigned int read_only = (channel == 0) ?
 525                 cval->master_readonly :
 526                 cval->ch_readonly & (1 << (channel - 1));
 527
 528         if (read_only) {
 529                 usb_audio_dbg(cval->head.mixer->chip,
 530                               "%s(): channel %d of control %d is read_only\n",
 531                             __func__, channel, cval->control);
 532                 return 0;
 533         }
 534
 535         err = snd_usb_mixer_set_ctl_value(cval,
 536                                           UAC_SET_CUR, (cval->control << 8) | channel,
 537                                           value);
 538         if (err < 0)
 539                 return err;
 540         cval->cached |= 1 << channel;
 541         cval->cache_val[index] = value;
 542         return 0;
 543 }
 544
 545 /*
 546  * TLV callback for mixer volume controls
 547  */
 548 int snd_usb_mixer_vol_tlv(struct snd_kcontrol *kcontrol, int op_flag,
 549                          unsigned int size, unsigned int __user *_tlv)
 550 {
 551         struct usb_mixer_elem_info *cval = kcontrol->private_data;
 552         DECLARE_TLV_DB_MINMAX(scale, 0, 0);
 553
 554         if (size < sizeof(scale))
 555                 return -ENOMEM;
 556         if (cval->min_mute)
 557                 scale[0] = SNDRV_CTL_TLVT_DB_MINMAX_MUTE;
 558         scale[2] = cval->dBmin;
 559         scale[3] = cval->dBmax;
 560         if (copy_to_user(_tlv, scale, sizeof(scale)))
 561                 return -EFAULT;
 562         return 0;
 563 }
 564
 565 /*
 566  * parser routines begin here...
 567  */
 568
 569 static int parse_audio_unit(struct mixer_build *state, int unitid);
 570
 571
 572 /*
 573  * check if the input/output channel routing is enabled on the given bitmap.
 574  * used for mixer unit parser
 575  */
 576 static int check_matrix_bitmap(unsigned char *bmap,
 577                                int ich, int och, int num_outs)
 578 {
 579         int idx = ich * num_outs + och;
 580         return bmap[idx >> 3] & (0x80 >> (idx & 7));
 581 }
 582
 583 /*
 584  * add an alsa control element
 585  * search and increment the index until an empty slot is found.
 586  *
 587  * if failed, give up and free the control instance.
 588  */
 589
 590 int snd_usb_mixer_add_list(struct usb_mixer_elem_list *list,
 591                            struct snd_kcontrol *kctl,
 592                            bool is_std_info)
 593 {
 594         struct usb_mixer_interface *mixer = list->mixer;
 595         int err;
 596
 597         while (snd_ctl_find_id(mixer->chip->card, &kctl->id))
 598                 kctl->id.index++;
 599         err = snd_ctl_add(mixer->chip->card, kctl);
 600         if (err < 0) {
 601                 usb_audio_dbg(mixer->chip, "cannot add control (err = %d)\n",
 602                               err);
 603                 return err;
 604         }
 605         list->kctl = kctl;
 606         list->is_std_info = is_std_info;
 607         list->next_id_elem = mixer->id_elems[list->id];
 608         mixer->id_elems[list->id] = list;
 609         return 0;
 610 }
 611
 612 /*
 613  * get a terminal name string
 614  */
 615
 616 static struct iterm_name_combo {
 617         int type;
 618         char *name;
 619 } iterm_names[] = {
 620         { 0x0300, "Output" },
 621         { 0x0301, "Speaker" },
 622         { 0x0302, "Headphone" },
 623         { 0x0303, "HMD Audio" },
 624         { 0x0304, "Desktop Speaker" },
 625         { 0x0305, "Room Speaker" },
 626         { 0x0306, "Com Speaker" },
 627         { 0x0307, "LFE" },
 628         { 0x0600, "External In" },
 629         { 0x0601, "Analog In" },
 630         { 0x0602, "Digital In" },
 631         { 0x0603, "Line" },
 632         { 0x0604, "Legacy In" },
 633         { 0x0605, "IEC958 In" },
 634         { 0x0606, "1394 DA Stream" },
 635         { 0x0607, "1394 DV Stream" },
 636         { 0x0700, "Embedded" },
 637         { 0x0701, "Noise Source" },
 638         { 0x0702, "Equalization Noise" },
 639         { 0x0703, "CD" },
 640         { 0x0704, "DAT" },
 641         { 0x0705, "DCC" },
 642         { 0x0706, "MiniDisk" },
 643         { 0x0707, "Analog Tape" },
 644         { 0x0708, "Phonograph" },
 645         { 0x0709, "VCR Audio" },
 646         { 0x070a, "Video Disk Audio" },
 647         { 0x070b, "DVD Audio" },
 648         { 0x070c, "TV Tuner Audio" },
 649         { 0x070d, "Satellite Rec Audio" },
 650         { 0x070e, "Cable Tuner Audio" },
 651         { 0x070f, "DSS Audio" },
 652         { 0x0710, "Radio Receiver" },
 653         { 0x0711, "Radio Transmitter" },
 654         { 0x0712, "Multi-Track Recorder" },
 655         { 0x0713, "Synthesizer" },
 656         { 0 },
 657 };
 658
 659 static int get_term_name(struct snd_usb_audio *chip, struct usb_audio_term *iterm,
 660                          unsigned char *name, int maxlen, int term_only)
 661 {
 662         struct iterm_name_combo *names;
 663         int len;
 664
 665         if (iterm->name) {
 666                 len = snd_usb_copy_string_desc(chip, iterm->name,
 667                                                 name, maxlen);
 668                 if (len)
 669                         return len;
 670         }
 671
 672         /* virtual type - not a real terminal */
 673         if (iterm->type >> 16) {
 674                 if (term_only)
 675                         return 0;
 676                 switch (iterm->type >> 16) {
 677                 case UAC3_SELECTOR_UNIT:
 678                         strcpy(name, "Selector");
 679                         return 8;
 680                 case UAC3_PROCESSING_UNIT:
 681                         strcpy(name, "Process Unit");
 682                         return 12;
 683                 case UAC3_EXTENSION_UNIT:
 684                         strcpy(name, "Ext Unit");
 685                         return 8;
 686                 case UAC3_MIXER_UNIT:
 687                         strcpy(name, "Mixer");
 688                         return 5;
 689                 default:
 690                         return sprintf(name, "Unit %d", iterm->id);
 691                 }
 692         }
 693
 694         switch (iterm->type & 0xff00) {
 695         case 0x0100:
 696                 strcpy(name, "PCM");
 697                 return 3;
 698         case 0x0200:
 699                 strcpy(name, "Mic");
 700                 return 3;
 701         case 0x0400:
 702                 strcpy(name, "Headset");
 703                 return 7;
 704         case 0x0500:
 705                 strcpy(name, "Phone");
 706                 return 5;
 707         }
 708
 709         for (names = iterm_names; names->type; names++) {
 710                 if (names->type == iterm->type) {
 711                         strcpy(name, names->name);
 712                         return strlen(names->name);
 713                 }
 714         }
 715
 716         return 0;
 717 }
 718
 719 /*
 720  * Get logical cluster information for UAC3 devices.
 721  */
 722 static int get_cluster_channels_v3(struct mixer_build *state, unsigned int cluster_id)
 723 {
 724         struct uac3_cluster_header_descriptor c_header;
 725         int err;
 726
 727         err = snd_usb_ctl_msg(state->chip->dev,
 728                         usb_rcvctrlpipe(state->chip->dev, 0),
 729                         UAC3_CS_REQ_HIGH_CAPABILITY_DESCRIPTOR,
 730                         USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
 731                         cluster_id,
 732                         snd_usb_ctrl_intf(state->chip),
 733                         &c_header, sizeof(c_header));
 734         if (err < 0)
 735                 goto error;
 736         if (err != sizeof(c_header)) {
 737                 err = -EIO;
 738                 goto error;
 739         }
 740
 741         return c_header.bNrChannels;
 742
 743 error:
 744         usb_audio_err(state->chip, "cannot request logical cluster ID: %d (err: %d)\n", cluster_id, err);
 745         return err;
 746 }
 747
 748 /*
 749  * Get number of channels for a Mixer Unit.
 750  */
 751 static int uac_mixer_unit_get_channels(struct mixer_build *state,
 752                                        struct uac_mixer_unit_descriptor *desc)
 753 {
 754         int mu_channels;
 755
 756         switch (state->mixer->protocol) {
 757         case UAC_VERSION_1:
 758         case UAC_VERSION_2:
 759         default:
 760                 if (desc->bLength < sizeof(*desc) + desc->bNrInPins + 1)
 761                         return 0; /* no bmControls -> skip */
 762                 mu_channels = uac_mixer_unit_bNrChannels(desc);
 763                 break;
 764         case UAC_VERSION_3:
 765                 mu_channels = get_cluster_channels_v3(state,
 766                                 uac3_mixer_unit_wClusterDescrID(desc));
 767                 break;
 768         }
 769
 770         return mu_channels;
 771 }
 772
 773 /*
 774  * Parse Input Terminal Unit
 775  */
 776 static int __check_input_term(struct mixer_build *state, int id,
 777                               struct usb_audio_term *term);
 778
 779 static int parse_term_uac1_iterm_unit(struct mixer_build *state,
 780                                       struct usb_audio_term *term,
 781                                       void *p1, int id)
 782 {
 783         struct uac_input_terminal_descriptor *d = p1;
 784
 785         term->type = le16_to_cpu(d->wTerminalType);
 786         term->channels = d->bNrChannels;
 787         term->chconfig = le16_to_cpu(d->wChannelConfig);
 788         term->name = d->iTerminal;
 789         return 0;
 790 }
 791
 792 static int parse_term_uac2_iterm_unit(struct mixer_build *state,
 793                                       struct usb_audio_term *term,
 794                                       void *p1, int id)
 795 {
 796         struct uac2_input_terminal_descriptor *d = p1;
 797         int err;
 798
 799         /* call recursively to verify the referenced clock entity */
 800         err = __check_input_term(state, d->bCSourceID, term);
 801         if (err < 0)
 802                 return err;
 803
 804         /* save input term properties after recursion,
 805          * to ensure they are not overriden by the recursion calls
 806          */
 807         term->id = id;
 808         term->type = le16_to_cpu(d->wTerminalType);
 809         term->channels = d->bNrChannels;
 810         term->chconfig = le32_to_cpu(d->bmChannelConfig);
 811         term->name = d->iTerminal;
 812         return 0;
 813 }
 814
 815 static int parse_term_uac3_iterm_unit(struct mixer_build *state,
 816                                       struct usb_audio_term *term,
 817                                       void *p1, int id)
 818 {
 819         struct uac3_input_terminal_descriptor *d = p1;
 820         int err;
 821
 822         /* call recursively to verify the referenced clock entity */
 823         err = __check_input_term(state, d->bCSourceID, term);
 824         if (err < 0)
 825                 return err;
 826
 827         /* save input term properties after recursion,
 828          * to ensure they are not overriden by the recursion calls
 829          */
 830         term->id = id;
 831         term->type = le16_to_cpu(d->wTerminalType);
 832
 833         err = get_cluster_channels_v3(state, le16_to_cpu(d->wClusterDescrID));
 834         if (err < 0)
 835                 return err;
 836         term->channels = err;
 837
 838         /* REVISIT: UAC3 IT doesn't have channels cfg */
 839         term->chconfig = 0;
 840
 841         term->name = le16_to_cpu(d->wTerminalDescrStr);
 842         return 0;
 843 }
 844
 845 static int parse_term_mixer_unit(struct mixer_build *state,
 846                                  struct usb_audio_term *term,
 847                                  void *p1, int id)
 848 {
 849         struct uac_mixer_unit_descriptor *d = p1;
 850         int protocol = state->mixer->protocol;
 851         int err;
 852
 853         err = uac_mixer_unit_get_channels(state, d);
 854         if (err <= 0)
 855                 return err;
 856
 857         term->type = UAC3_MIXER_UNIT << 16; /* virtual type */
 858         term->channels = err;
 859         if (protocol != UAC_VERSION_3) {
 860                 term->chconfig = uac_mixer_unit_wChannelConfig(d, protocol);
 861                 term->name = uac_mixer_unit_iMixer(d);
 862         }
 863         return 0;
 864 }
 865
 866 static int parse_term_selector_unit(struct mixer_build *state,
 867                                     struct usb_audio_term *term,
 868                                     void *p1, int id)
 869 {
 870         struct uac_selector_unit_descriptor *d = p1;
 871         int err;
 872
 873         /* call recursively to retrieve the channel info */
 874         err = __check_input_term(state, d->baSourceID[0], term);
 875         if (err < 0)
 876                 return err;
 877         term->type = UAC3_SELECTOR_UNIT << 16; /* virtual type */
 878         term->id = id;
 879         if (state->mixer->protocol != UAC_VERSION_3)
 880                 term->name = uac_selector_unit_iSelector(d);
 881         return 0;
 882 }
 883
 884 static int parse_term_proc_unit(struct mixer_build *state,
 885                                 struct usb_audio_term *term,
 886                                 void *p1, int id, int vtype)
 887 {
 888         struct uac_processing_unit_descriptor *d = p1;
 889         int protocol = state->mixer->protocol;
 890         int err;
 891
 892         if (d->bNrInPins) {
 893                 /* call recursively to retrieve the channel info */
 894                 err = __check_input_term(state, d->baSourceID[0], term);
 895                 if (err < 0)
 896                         return err;
 897         }
 898
 899         term->type = vtype << 16; /* virtual type */
 900         term->id = id;
 901
 902         if (protocol == UAC_VERSION_3)
 903                 return 0;
 904
 905         if (!term->channels) {
 906                 term->channels = uac_processing_unit_bNrChannels(d);
 907                 term->chconfig = uac_processing_unit_wChannelConfig(d, protocol);
 908         }
 909         term->name = uac_processing_unit_iProcessing(d, protocol);
 910         return 0;
 911 }
 912
 913 static int parse_term_effect_unit(struct mixer_build *state,
 914                                   struct usb_audio_term *term,
 915                                   void *p1, int id)
 916 {
 917         struct uac2_effect_unit_descriptor *d = p1;
 918         int err;
 919
 920         err = __check_input_term(state, d->bSourceID, term);
 921         if (err < 0)
 922                 return err;
 923         term->type = UAC3_EFFECT_UNIT << 16; /* virtual type */
 924         term->id = id;
 925         return 0;
 926 }
 927
 928 static int parse_term_uac2_clock_source(struct mixer_build *state,
 929                                         struct usb_audio_term *term,
 930                                         void *p1, int id)
 931 {
 932         struct uac_clock_source_descriptor *d = p1;
 933
 934         term->type = UAC3_CLOCK_SOURCE << 16; /* virtual type */
 935         term->id = id;
 936         term->name = d->iClockSource;
 937         return 0;
 938 }
 939
 940 static int parse_term_uac3_clock_source(struct mixer_build *state,
 941                                         struct usb_audio_term *term,
 942                                         void *p1, int id)
 943 {
 944         struct uac3_clock_source_descriptor *d = p1;
 945
 946         term->type = UAC3_CLOCK_SOURCE << 16; /* virtual type */
 947         term->id = id;
 948         term->name = le16_to_cpu(d->wClockSourceStr);
 949         return 0;
 950 }
 951
 952 #define PTYPE(a, b)     ((a) << 8 | (b))
 953
 954 /*
 955  * parse the source unit recursively until it reaches to a terminal
 956  * or a branched unit.
 957  */
 958 static int __check_input_term(struct mixer_build *state, int id,
 959                               struct usb_audio_term *term)
 960 {
 961         int protocol = state->mixer->protocol;
 962         void *p1;
 963         unsigned char *hdr;
 964
 965         for (;;) {
 966                 /* a loop in the terminal chain? */
 967                 if (test_and_set_bit(id, state->termbitmap))
 968                         return -EINVAL;
 969
 970                 p1 = find_audio_control_unit(state, id);
 971                 if (!p1)
 972                         break;
 973                 if (!snd_usb_validate_audio_desc(p1, protocol))
 974                         break; /* bad descriptor */
 975
 976                 hdr = p1;
 977                 term->id = id;
 978
 979                 switch (PTYPE(protocol, hdr[2])) {
 980                 case PTYPE(UAC_VERSION_1, UAC_FEATURE_UNIT):
 981                 case PTYPE(UAC_VERSION_2, UAC_FEATURE_UNIT):
 982                 case PTYPE(UAC_VERSION_3, UAC3_FEATURE_UNIT): {
 983                         /* the header is the same for all versions */
 984                         struct uac_feature_unit_descriptor *d = p1;
 985
 986                         id = d->bSourceID;
 987                         break; /* continue to parse */
 988                 }
 989                 case PTYPE(UAC_VERSION_1, UAC_INPUT_TERMINAL):
 990                         return parse_term_uac1_iterm_unit(state, term, p1, id);
 991                 case PTYPE(UAC_VERSION_2, UAC_INPUT_TERMINAL):
 992                         return parse_term_uac2_iterm_unit(state, term, p1, id);
 993                 case PTYPE(UAC_VERSION_3, UAC_INPUT_TERMINAL):
 994                         return parse_term_uac3_iterm_unit(state, term, p1, id);
 995                 case PTYPE(UAC_VERSION_1, UAC_MIXER_UNIT):
 996                 case PTYPE(UAC_VERSION_2, UAC_MIXER_UNIT):
 997                 case PTYPE(UAC_VERSION_3, UAC3_MIXER_UNIT):
 998                         return parse_term_mixer_unit(state, term, p1, id);
 999                 case PTYPE(UAC_VERSION_1, UAC_SELECTOR_UNIT):
1000                 case PTYPE(UAC_VERSION_2, UAC_SELECTOR_UNIT):
1001                 case PTYPE(UAC_VERSION_2, UAC2_CLOCK_SELECTOR):
1002                 case PTYPE(UAC_VERSION_3, UAC3_SELECTOR_UNIT):
1003                 case PTYPE(UAC_VERSION_3, UAC3_CLOCK_SELECTOR):
1004                         return parse_term_selector_unit(state, term, p1, id);
1005                 case PTYPE(UAC_VERSION_1, UAC1_PROCESSING_UNIT):
1006                 case PTYPE(UAC_VERSION_2, UAC2_PROCESSING_UNIT_V2):
1007                 case PTYPE(UAC_VERSION_3, UAC3_PROCESSING_UNIT):
1008                         return parse_term_proc_unit(state, term, p1, id,
1009                                                     UAC3_PROCESSING_UNIT);
1010                 case PTYPE(UAC_VERSION_2, UAC2_EFFECT_UNIT):
1011                 case PTYPE(UAC_VERSION_3, UAC3_EFFECT_UNIT):
1012                         return parse_term_effect_unit(state, term, p1, id);
1013                 case PTYPE(UAC_VERSION_1, UAC1_EXTENSION_UNIT):
1014                 case PTYPE(UAC_VERSION_2, UAC2_EXTENSION_UNIT_V2):
1015                 case PTYPE(UAC_VERSION_3, UAC3_EXTENSION_UNIT):
1016                         return parse_term_proc_unit(state, term, p1, id,
1017                                                     UAC3_EXTENSION_UNIT);
1018                 case PTYPE(UAC_VERSION_2, UAC2_CLOCK_SOURCE):
1019                         return parse_term_uac2_clock_source(state, term, p1, id);
1020                 case PTYPE(UAC_VERSION_3, UAC3_CLOCK_SOURCE):
1021                         return parse_term_uac3_clock_source(state, term, p1, id);
1022                 default:
1023                         return -ENODEV;
1024                 }
1025         }
1026         return -ENODEV;
1027 }
1028
1029
1030 static int check_input_term(struct mixer_build *state, int id,
1031                             struct usb_audio_term *term)
1032 {
1033         memset(term, 0, sizeof(*term));
1034         memset(state->termbitmap, 0, sizeof(state->termbitmap));
1035         return __check_input_term(state, id, term);
1036 }
1037
1038 /*
1039  * Feature Unit
1040  */
1041
1042 /* feature unit control information */
1043 struct usb_feature_control_info {
1044         int control;
1045         const char *name;
1046         int type;       /* data type for uac1 */
1047         int type_uac2;  /* data type for uac2 if different from uac1, else -1 */
1048 };
1049
1050 static const struct usb_feature_control_info audio_feature_info[] = {
1051         { UAC_FU_MUTE,                  "Mute",                 USB_MIXER_INV_BOOLEAN, -1 },
1052         { UAC_FU_VOLUME,                "Volume",               USB_MIXER_S16, -1 },
1053         { UAC_FU_BASS,                  "Tone Control - Bass",  USB_MIXER_S8, -1 },
1054         { UAC_FU_MID,                   "Tone Control - Mid",   USB_MIXER_S8, -1 },
1055         { UAC_FU_TREBLE,                "Tone Control - Treble", USB_MIXER_S8, -1 },
1056         { UAC_FU_GRAPHIC_EQUALIZER,     "Graphic Equalizer",    USB_MIXER_S8, -1 }, /* FIXME: not implemented yet */
1057         { UAC_FU_AUTOMATIC_GAIN,        "Auto Gain Control",    USB_MIXER_BOOLEAN, -1 },
1058         { UAC_FU_DELAY,                 "Delay Control",        USB_MIXER_U16, USB_MIXER_U32 },
1059         { UAC_FU_BASS_BOOST,            "Bass Boost",           USB_MIXER_BOOLEAN, -1 },
1060         { UAC_FU_LOUDNESS,              "Loudness",             USB_MIXER_BOOLEAN, -1 },
1061         /* UAC2 specific */
1062         { UAC2_FU_INPUT_GAIN,           "Input Gain Control",   USB_MIXER_S16, -1 },
1063         { UAC2_FU_INPUT_GAIN_PAD,       "Input Gain Pad Control", USB_MIXER_S16, -1 },
1064         { UAC2_FU_PHASE_INVERTER,        "Phase Inverter Control", USB_MIXER_BOOLEAN, -1 },
1065 };
1066
1067 static void usb_mixer_elem_info_free(struct usb_mixer_elem_info *cval)
1068 {
1069         kfree(cval);
1070 }
1071
1072 /* private_free callback */
1073 void snd_usb_mixer_elem_free(struct snd_kcontrol *kctl)
1074 {
1075         usb_mixer_elem_info_free(kctl->private_data);
1076         kctl->private_data = NULL;
1077 }
1078
1079 /*
1080  * interface to ALSA control for feature/mixer units
1081  */
1082
1083 /* volume control quirks */
1084 static void volume_control_quirks(struct usb_mixer_elem_info *cval,
1085                                   struct snd_kcontrol *kctl)
1086 {
1087         struct snd_usb_audio *chip = cval->head.mixer->chip;
1088         switch (chip->usb_id) {
1089         case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
1090         case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
1091                 if (strcmp(kctl->id.name, "Effect Duration") == 0) {
1092                         cval->min = 0x0000;
1093                         cval->max = 0xffff;
1094                         cval->res = 0x00e6;
1095                         break;
1096                 }
1097                 if (strcmp(kctl->id.name, "Effect Volume") == 0 ||
1098                     strcmp(kctl->id.name, "Effect Feedback Volume") == 0) {
1099                         cval->min = 0x00;
1100                         cval->max = 0xff;
1101                         break;
1102                 }
1103                 if (strstr(kctl->id.name, "Effect Return") != NULL) {
1104                         cval->min = 0xb706;
1105                         cval->max = 0xff7b;
1106                         cval->res = 0x0073;
1107                         break;
1108                 }
1109                 if ((strstr(kctl->id.name, "Playback Volume") != NULL) ||
1110                         (strstr(kctl->id.name, "Effect Send") != NULL)) {
1111                         cval->min = 0xb5fb; /* -73 dB = 0xb6ff */
1112                         cval->max = 0xfcfe;
1113                         cval->res = 0x0073;
1114                 }
1115                 break;
1116
1117         case USB_ID(0x0763, 0x2081): /* M-Audio Fast Track Ultra 8R */
1118         case USB_ID(0x0763, 0x2080): /* M-Audio Fast Track Ultra */
1119                 if (strcmp(kctl->id.name, "Effect Duration") == 0) {
1120                         usb_audio_info(chip,
1121                                        "set quirk for FTU Effect Duration\n");
1122                         cval->min = 0x0000;
1123                         cval->max = 0x7f00;
1124                         cval->res = 0x0100;
1125                         break;
1126                 }
1127                 if (strcmp(kctl->id.name, "Effect Volume") == 0 ||
1128                     strcmp(kctl->id.name, "Effect Feedback Volume") == 0) {
1129                         usb_audio_info(chip,
1130                                        "set quirks for FTU Effect Feedback/Volume\n");
1131                         cval->min = 0x00;
1132                         cval->max = 0x7f;
1133                         break;
1134                 }
1135                 break;
1136
1137         case USB_ID(0x0d8c, 0x0103):
1138                 if (!strcmp(kctl->id.name, "PCM Playback Volume")) {
1139                         usb_audio_info(chip,
1140                                  "set volume quirk for CM102-A+/102S+\n");
1141                         cval->min = -256;
1142                 }
1143                 break;
1144
1145         case USB_ID(0x0471, 0x0101):
1146         case USB_ID(0x0471, 0x0104):
1147         case USB_ID(0x0471, 0x0105):
1148         case USB_ID(0x0672, 0x1041):
1149         /* quirk for UDA1321/N101.
1150          * note that detection between firmware 2.1.1.7 (N101)
1151          * and later 2.1.1.21 is not very clear from datasheets.
1152          * I hope that the min value is -15360 for newer firmware --jk
1153          */
1154                 if (!strcmp(kctl->id.name, "PCM Playback Volume") &&
1155                     cval->min == -15616) {
1156                         usb_audio_info(chip,
1157                                  "set volume quirk for UDA1321/N101 chip\n");
1158                         cval->max = -256;
1159                 }
1160                 break;
1161
1162         case USB_ID(0x046d, 0x09a4):
1163                 if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
1164                         usb_audio_info(chip,
1165                                 "set volume quirk for QuickCam E3500\n");
1166                         cval->min = 6080;
1167                         cval->max = 8768;
1168                         cval->res = 192;
1169                 }
1170                 break;
1171
1172         case USB_ID(0x046d, 0x0807): /* Logitech Webcam C500 */
1173         case USB_ID(0x046d, 0x0808):
1174         case USB_ID(0x046d, 0x0809):
1175         case USB_ID(0x046d, 0x0819): /* Logitech Webcam C210 */
1176         case USB_ID(0x046d, 0x081b): /* HD Webcam c310 */
1177         case USB_ID(0x046d, 0x081d): /* HD Webcam c510 */
1178         case USB_ID(0x046d, 0x0825): /* HD Webcam c270 */
1179         case USB_ID(0x046d, 0x0826): /* HD Webcam c525 */
1180         case USB_ID(0x046d, 0x08ca): /* Logitech Quickcam Fusion */
1181         case USB_ID(0x046d, 0x0991):
1182         case USB_ID(0x046d, 0x09a2): /* QuickCam Communicate Deluxe/S7500 */
1183         /* Most audio usb devices lie about volume resolution.
1184          * Most Logitech webcams have res = 384.
1185          * Probably there is some logitech magic behind this number --fishor
1186          */
1187                 if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
1188                         usb_audio_info(chip,
1189                                 "set resolution quirk: cval->res = 384\n");
1190                         cval->res = 384;
1191                 }
1192                 break;
1193         case USB_ID(0x0495, 0x3042): /* ESS Technology Asus USB DAC */
1194                 if ((strstr(kctl->id.name, "Playback Volume") != NULL) ||
1195                         strstr(kctl->id.name, "Capture Volume") != NULL) {
1196                         cval->min >>= 8;
1197                         cval->max = 0;
1198                         cval->res = 1;
1199                 }
1200                 break;
1201         }
1202 }
1203
1204 /*
1205  * retrieve the minimum and maximum values for the specified control
1206  */
1207 static int get_min_max_with_quirks(struct usb_mixer_elem_info *cval,
1208                                    int default_min, struct snd_kcontrol *kctl)
1209 {
1210         /* for failsafe */
1211         cval->min = default_min;
1212         cval->max = cval->min + 1;
1213         cval->res = 1;
1214         cval->dBmin = cval->dBmax = 0;
1215
1216         if (cval->val_type == USB_MIXER_BOOLEAN ||
1217             cval->val_type == USB_MIXER_INV_BOOLEAN) {
1218                 cval->initialized = 1;
1219         } else {
1220                 int minchn = 0;
1221                 if (cval->cmask) {
1222                         int i;
1223                         for (i = 0; i < MAX_CHANNELS; i++)
1224                                 if (cval->cmask & (1 << i)) {
1225                                         minchn = i + 1;
1226                                         break;
1227                                 }
1228                 }
1229                 if (get_ctl_value(cval, UAC_GET_MAX, (cval->control << 8) | minchn, &cval->max) < 0 ||
1230                     get_ctl_value(cval, UAC_GET_MIN, (cval->control << 8) | minchn, &cval->min) < 0) {
1231                         usb_audio_err(cval->head.mixer->chip,
1232                                       "%d:%d: cannot get min/max values for control %d (id %d)\n",
1233                                    cval->head.id, mixer_ctrl_intf(cval->head.mixer),
1234                                                                cval->control, cval->head.id);
1235                         return -EINVAL;
1236                 }
1237                 if (get_ctl_value(cval, UAC_GET_RES,
1238                                   (cval->control << 8) | minchn,
1239                                   &cval->res) < 0) {
1240                         cval->res = 1;
1241                 } else if (cval->head.mixer->protocol == UAC_VERSION_1) {
1242                         int last_valid_res = cval->res;
1243
1244                         while (cval->res > 1) {
1245                                 if (snd_usb_mixer_set_ctl_value(cval, UAC_SET_RES,
1246                                                                 (cval->control << 8) | minchn,
1247                                                                 cval->res / 2) < 0)
1248                                         break;
1249                                 cval->res /= 2;
1250                         }
1251                         if (get_ctl_value(cval, UAC_GET_RES,
1252                                           (cval->control << 8) | minchn, &cval->res) < 0)
1253                                 cval->res = last_valid_res;
1254                 }
1255                 if (cval->res == 0)
1256                         cval->res = 1;
1257
1258                 /* Additional checks for the proper resolution
1259                  *
1260                  * Some devices report smaller resolutions than actually
1261                  * reacting.  They don't return errors but simply clip
1262                  * to the lower aligned value.
1263                  */
1264                 if (cval->min + cval->res < cval->max) {
1265                         int last_valid_res = cval->res;
1266                         int saved, test, check;
1267                         if (get_cur_mix_raw(cval, minchn, &saved) < 0)
1268                                 goto no_res_check;
1269                         for (;;) {
1270                                 test = saved;
1271                                 if (test < cval->max)
1272                                         test += cval->res;
1273                                 else
1274                                         test -= cval->res;
1275                                 if (test < cval->min || test > cval->max ||
1276                                     snd_usb_set_cur_mix_value(cval, minchn, 0, test) ||
1277                                     get_cur_mix_raw(cval, minchn, &check)) {
1278                                         cval->res = last_valid_res;
1279                                         break;
1280                                 }
1281                                 if (test == check)
1282                                         break;
1283                                 cval->res *= 2;
1284                         }
1285                         snd_usb_set_cur_mix_value(cval, minchn, 0, saved);
1286                 }
1287
1288 no_res_check:
1289                 cval->initialized = 1;
1290         }
1291
1292         if (kctl)
1293                 volume_control_quirks(cval, kctl);
1294
1295         /* USB descriptions contain the dB scale in 1/256 dB unit
1296          * while ALSA TLV contains in 1/100 dB unit
1297          */
1298         cval->dBmin = (convert_signed_value(cval, cval->min) * 100) / 256;
1299         cval->dBmax = (convert_signed_value(cval, cval->max) * 100) / 256;
1300         if (cval->dBmin > cval->dBmax) {
1301                 /* something is wrong; assume it's either from/to 0dB */
1302                 if (cval->dBmin < 0)
1303                         cval->dBmax = 0;
1304                 else if (cval->dBmin > 0)
1305                         cval->dBmin = 0;
1306                 if (cval->dBmin > cval->dBmax) {
1307                         /* totally crap, return an error */
1308                         return -EINVAL;
1309                 }
1310         } else {
1311                 /* if the max volume is too low, it's likely a bogus range;
1312                  * here we use -96dB as the threshold
1313                  */
1314                 if (cval->dBmax <= -9600) {
1315                         usb_audio_info(cval->head.mixer->chip,
1316                                        "%d:%d: bogus dB values (%d/%d), disabling dB reporting\n",
1317                                        cval->head.id, mixer_ctrl_intf(cval->head.mixer),
1318                                        cval->dBmin, cval->dBmax);
1319                         cval->dBmin = cval->dBmax = 0;
1320                 }
1321         }
1322
1323         return 0;
1324 }
1325
1326 #define get_min_max(cval, def)  get_min_max_with_quirks(cval, def, NULL)
1327
1328 /* get a feature/mixer unit info */
1329 static int mixer_ctl_feature_info(struct snd_kcontrol *kcontrol,
1330                                   struct snd_ctl_elem_info *uinfo)
1331 {
1332         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1333
1334         if (cval->val_type == USB_MIXER_BOOLEAN ||
1335             cval->val_type == USB_MIXER_INV_BOOLEAN)
1336                 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1337         else
1338                 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
1339         uinfo->count = cval->channels;
1340         if (cval->val_type == USB_MIXER_BOOLEAN ||
1341             cval->val_type == USB_MIXER_INV_BOOLEAN) {
1342                 uinfo->value.integer.min = 0;
1343                 uinfo->value.integer.max = 1;
1344         } else {
1345                 if (!cval->initialized) {
1346                         get_min_max_with_quirks(cval, 0, kcontrol);
1347                         if (cval->initialized && cval->dBmin >= cval->dBmax) {
1348                                 kcontrol->vd[0].access &=
1349                                         ~(SNDRV_CTL_ELEM_ACCESS_TLV_READ |
1350                                           SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK);
1351                                 snd_ctl_notify(cval->head.mixer->chip->card,
1352                                                SNDRV_CTL_EVENT_MASK_INFO,
1353                                                &kcontrol->id);
1354                         }
1355                 }
1356                 uinfo->value.integer.min = 0;
1357                 uinfo->value.integer.max =
1358                         DIV_ROUND_UP(cval->max - cval->min, cval->res);
1359         }
1360         return 0;
1361 }
1362
1363 /* get the current value from feature/mixer unit */
1364 static int mixer_ctl_feature_get(struct snd_kcontrol *kcontrol,
1365                                  struct snd_ctl_elem_value *ucontrol)
1366 {
1367         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1368         int c, cnt, val, err;
1369
1370         ucontrol->value.integer.value[0] = cval->min;
1371         if (cval->cmask) {
1372                 cnt = 0;
1373                 for (c = 0; c < MAX_CHANNELS; c++) {
1374                         if (!(cval->cmask & (1 << c)))
1375                                 continue;
1376                         err = snd_usb_get_cur_mix_value(cval, c + 1, cnt, &val);
1377                         if (err < 0)
1378                                 return filter_error(cval, err);
1379                         val = get_relative_value(cval, val);
1380                         ucontrol->value.integer.value[cnt] = val;
1381                         cnt++;
1382                 }
1383                 return 0;
1384         } else {
1385                 /* master channel */
1386                 err = snd_usb_get_cur_mix_value(cval, 0, 0, &val);
1387                 if (err < 0)
1388                         return filter_error(cval, err);
1389                 val = get_relative_value(cval, val);
1390                 ucontrol->value.integer.value[0] = val;
1391         }
1392         return 0;
1393 }
1394
1395 /* put the current value to feature/mixer unit */
1396 static int mixer_ctl_feature_put(struct snd_kcontrol *kcontrol,
1397                                  struct snd_ctl_elem_value *ucontrol)
1398 {
1399         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1400         int c, cnt, val, oval, err;
1401         int changed = 0;
1402
1403         if (cval->cmask) {
1404                 cnt = 0;
1405                 for (c = 0; c < MAX_CHANNELS; c++) {
1406                         if (!(cval->cmask & (1 << c)))
1407                                 continue;
1408                         err = snd_usb_get_cur_mix_value(cval, c + 1, cnt, &oval);
1409                         if (err < 0)
1410                                 return filter_error(cval, err);
1411                         val = ucontrol->value.integer.value[cnt];
1412                         val = get_abs_value(cval, val);
1413                         if (oval != val) {
1414                                 snd_usb_set_cur_mix_value(cval, c + 1, cnt, val);
1415                                 changed = 1;
1416                         }
1417                         cnt++;
1418                 }
1419         } else {
1420                 /* master channel */
1421                 err = snd_usb_get_cur_mix_value(cval, 0, 0, &oval);
1422                 if (err < 0)
1423                         return filter_error(cval, err);
1424                 val = ucontrol->value.integer.value[0];
1425                 val = get_abs_value(cval, val);
1426                 if (val != oval) {
1427                         snd_usb_set_cur_mix_value(cval, 0, 0, val);
1428                         changed = 1;
1429                 }
1430         }
1431         return changed;
1432 }
1433
1434 /* get the boolean value from the master channel of a UAC control */
1435 static int mixer_ctl_master_bool_get(struct snd_kcontrol *kcontrol,
1436                                      struct snd_ctl_elem_value *ucontrol)
1437 {
1438         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1439         int val, err;
1440
1441         err = snd_usb_get_cur_mix_value(cval, 0, 0, &val);
1442         if (err < 0)
1443                 return filter_error(cval, err);
1444         val = (val != 0);
1445         ucontrol->value.integer.value[0] = val;
1446         return 0;
1447 }
1448
1449 static int get_connector_value(struct usb_mixer_elem_info *cval,
1450                                char *name, int *val)
1451 {
1452         struct snd_usb_audio *chip = cval->head.mixer->chip;
1453         int idx = 0, validx, ret;
1454
1455         validx = cval->control << 8 | 0;
1456
1457         ret = snd_usb_lock_shutdown(chip) ? -EIO : 0;
1458         if (ret)
1459                 goto error;
1460
1461         idx = mixer_ctrl_intf(cval->head.mixer) | (cval->head.id << 8);
1462         if (cval->head.mixer->protocol == UAC_VERSION_2) {
1463                 struct uac2_connectors_ctl_blk uac2_conn;
1464
1465                 ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), UAC2_CS_CUR,
1466                                       USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
1467                                       validx, idx, &uac2_conn, sizeof(uac2_conn));
1468                 if (val)
1469                         *val = !!uac2_conn.bNrChannels;
1470         } else { /* UAC_VERSION_3 */
1471                 struct uac3_insertion_ctl_blk uac3_conn;
1472
1473                 ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), UAC2_CS_CUR,
1474                                       USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
1475                                       validx, idx, &uac3_conn, sizeof(uac3_conn));
1476                 if (val)
1477                         *val = !!uac3_conn.bmConInserted;
1478         }
1479
1480         snd_usb_unlock_shutdown(chip);
1481
1482         if (ret < 0) {
1483                 if (name && strstr(name, "Speaker")) {
1484                         if (val)
1485                                 *val = 1;
1486                         return 0;
1487                 }
1488 error:
1489                 usb_audio_err(chip,
1490                         "cannot get connectors status: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
1491                         UAC_GET_CUR, validx, idx, cval->val_type);
1492                 return filter_error(cval, ret);
1493         }
1494
1495         return ret;
1496 }
1497
1498 /* get the connectors status and report it as boolean type */
1499 static int mixer_ctl_connector_get(struct snd_kcontrol *kcontrol,
1500                                    struct snd_ctl_elem_value *ucontrol)
1501 {
1502         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1503         int ret, val;
1504
1505         ret = get_connector_value(cval, kcontrol->id.name, &val);
1506
1507         if (ret < 0)
1508                 return ret;
1509
1510         ucontrol->value.integer.value[0] = val;
1511         return 0;
1512 }
1513
1514 static const struct snd_kcontrol_new usb_feature_unit_ctl = {
1515         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1516         .name = "", /* will be filled later manually */
1517         .info = mixer_ctl_feature_info,
1518         .get = mixer_ctl_feature_get,
1519         .put = mixer_ctl_feature_put,
1520 };
1521
1522 /* the read-only variant */
1523 static const struct snd_kcontrol_new usb_feature_unit_ctl_ro = {
1524         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1525         .name = "", /* will be filled later manually */
1526         .info = mixer_ctl_feature_info,
1527         .get = mixer_ctl_feature_get,
1528         .put = NULL,
1529 };
1530
1531 /*
1532  * A control which shows the boolean value from reading a UAC control on
1533  * the master channel.
1534  */
1535 static const struct snd_kcontrol_new usb_bool_master_control_ctl_ro = {
1536         .iface = SNDRV_CTL_ELEM_IFACE_CARD,
1537         .name = "", /* will be filled later manually */
1538         .access = SNDRV_CTL_ELEM_ACCESS_READ,
1539         .info = snd_ctl_boolean_mono_info,
1540         .get = mixer_ctl_master_bool_get,
1541         .put = NULL,
1542 };
1543
1544 static const struct snd_kcontrol_new usb_connector_ctl_ro = {
1545         .iface = SNDRV_CTL_ELEM_IFACE_CARD,
1546         .name = "", /* will be filled later manually */
1547         .access = SNDRV_CTL_ELEM_ACCESS_READ,
1548         .info = snd_ctl_boolean_mono_info,
1549         .get = mixer_ctl_connector_get,
1550         .put = NULL,
1551 };
1552
1553 /*
1554  * This symbol is exported in order to allow the mixer quirks to
1555  * hook up to the standard feature unit control mechanism
1556  */
1557 const struct snd_kcontrol_new *snd_usb_feature_unit_ctl = &usb_feature_unit_ctl;
1558
1559 /*
1560  * build a feature control
1561  */
1562 static size_t append_ctl_name(struct snd_kcontrol *kctl, const char *str)
1563 {
1564         return strlcat(kctl->id.name, str, sizeof(kctl->id.name));
1565 }
1566
1567 /*
1568  * A lot of headsets/headphones have a "Speaker" mixer. Make sure we
1569  * rename it to "Headphone". We determine if something is a headphone
1570  * similar to how udev determines form factor.
1571  */
1572 static void check_no_speaker_on_headset(struct snd_kcontrol *kctl,
1573                                         struct snd_card *card)
1574 {
1575         const char *names_to_check[] = {
1576                 "Headset", "headset", "Headphone", "headphone", NULL};
1577         const char **s;
1578         bool found = false;
1579
1580         if (strcmp("Speaker", kctl->id.name))
1581                 return;
1582
1583         for (s = names_to_check; *s; s++)
1584                 if (strstr(card->shortname, *s)) {
1585                         found = true;
1586                         break;
1587                 }
1588
1589         if (!found)
1590                 return;
1591
1592         strscpy(kctl->id.name, "Headphone", sizeof(kctl->id.name));
1593 }
1594
1595 static const struct usb_feature_control_info *get_feature_control_info(int control)
1596 {
1597         int i;
1598
1599         for (i = 0; i < ARRAY_SIZE(audio_feature_info); ++i) {
1600                 if (audio_feature_info[i].control == control)
1601                         return &audio_feature_info[i];
1602         }
1603         return NULL;
1604 }
1605
1606 static void __build_feature_ctl(struct usb_mixer_interface *mixer,
1607                                 const struct usbmix_name_map *imap,
1608                                 unsigned int ctl_mask, int control,
1609                                 struct usb_audio_term *iterm,
1610                                 struct usb_audio_term *oterm,
1611                                 int unitid, int nameid, int readonly_mask)
1612 {
1613         const struct usb_feature_control_info *ctl_info;
1614         unsigned int len = 0;
1615         int mapped_name = 0;
1616         struct snd_kcontrol *kctl;
1617         struct usb_mixer_elem_info *cval;
1618         const struct usbmix_name_map *map;
1619         unsigned int range;
1620
1621         if (control == UAC_FU_GRAPHIC_EQUALIZER) {
1622                 /* FIXME: not supported yet */
1623                 return;
1624         }
1625
1626         map = find_map(imap, unitid, control);
1627         if (check_ignored_ctl(map))
1628                 return;
1629
1630         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1631         if (!cval)
1632                 return;
1633         snd_usb_mixer_elem_init_std(&cval->head, mixer, unitid);
1634         cval->control = control;
1635         cval->cmask = ctl_mask;
1636
1637         ctl_info = get_feature_control_info(control);
1638         if (!ctl_info) {
1639                 usb_mixer_elem_info_free(cval);
1640                 return;
1641         }
1642         if (mixer->protocol == UAC_VERSION_1)
1643                 cval->val_type = ctl_info->type;
1644         else /* UAC_VERSION_2 */
1645                 cval->val_type = ctl_info->type_uac2 >= 0 ?
1646                         ctl_info->type_uac2 : ctl_info->type;
1647
1648         if (ctl_mask == 0) {
1649                 cval->channels = 1;     /* master channel */
1650                 cval->master_readonly = readonly_mask;
1651         } else {
1652                 int i, c = 0;
1653                 for (i = 0; i < 16; i++)
1654                         if (ctl_mask & (1 << i))
1655                                 c++;
1656                 cval->channels = c;
1657                 cval->ch_readonly = readonly_mask;
1658         }
1659
1660         /*
1661          * If all channels in the mask are marked read-only, make the control
1662          * read-only. snd_usb_set_cur_mix_value() will check the mask again and won't
1663          * issue write commands to read-only channels.
1664          */
1665         if (cval->channels == readonly_mask)
1666                 kctl = snd_ctl_new1(&usb_feature_unit_ctl_ro, cval);
1667         else
1668                 kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
1669
1670         if (!kctl) {
1671                 usb_audio_err(mixer->chip, "cannot malloc kcontrol\n");
1672                 usb_mixer_elem_info_free(cval);
1673                 return;
1674         }
1675         kctl->private_free = snd_usb_mixer_elem_free;
1676
1677         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
1678         mapped_name = len != 0;
1679         if (!len && nameid)
1680                 len = snd_usb_copy_string_desc(mixer->chip, nameid,
1681                                 kctl->id.name, sizeof(kctl->id.name));
1682
1683         switch (control) {
1684         case UAC_FU_MUTE:
1685         case UAC_FU_VOLUME:
1686                 /*
1687                  * determine the control name.  the rule is:
1688                  * - if a name id is given in descriptor, use it.
1689                  * - if the connected input can be determined, then use the name
1690                  *   of terminal type.
1691                  * - if the connected output can be determined, use it.
1692                  * - otherwise, anonymous name.
1693                  */
1694                 if (!len) {
1695                         if (iterm)
1696                                 len = get_term_name(mixer->chip, iterm,
1697                                                     kctl->id.name,
1698                                                     sizeof(kctl->id.name), 1);
1699                         if (!len && oterm)
1700                                 len = get_term_name(mixer->chip, oterm,
1701                                                     kctl->id.name,
1702                                                     sizeof(kctl->id.name), 1);
1703                         if (!len)
1704                                 snprintf(kctl->id.name, sizeof(kctl->id.name),
1705                                          "Feature %d", unitid);
1706                 }
1707
1708                 if (!mapped_name)
1709                         check_no_speaker_on_headset(kctl, mixer->chip->card);
1710
1711                 /*
1712                  * determine the stream direction:
1713                  * if the connected output is USB stream, then it's likely a
1714                  * capture stream.  otherwise it should be playback (hopefully :)
1715                  */
1716                 if (!mapped_name && oterm && !(oterm->type >> 16)) {
1717                         if ((oterm->type & 0xff00) == 0x0100)
1718                                 append_ctl_name(kctl, " Capture");
1719                         else
1720                                 append_ctl_name(kctl, " Playback");
1721                 }
1722                 append_ctl_name(kctl, control == UAC_FU_MUTE ?
1723                                 " Switch" : " Volume");
1724                 break;
1725         default:
1726                 if (!len)
1727                         strscpy(kctl->id.name, audio_feature_info[control-1].name,
1728                                 sizeof(kctl->id.name));
1729                 break;
1730         }
1731
1732         /* get min/max values */
1733         get_min_max_with_quirks(cval, 0, kctl);
1734
1735         /* skip a bogus volume range */
1736         if (cval->max <= cval->min) {
1737                 usb_audio_dbg(mixer->chip,
1738                               "[%d] FU [%s] skipped due to invalid volume\n",
1739                               cval->head.id, kctl->id.name);
1740                 snd_ctl_free_one(kctl);
1741                 return;
1742         }
1743
1744
1745         if (control == UAC_FU_VOLUME) {
1746                 check_mapped_dB(map, cval);
1747                 if (cval->dBmin < cval->dBmax || !cval->initialized) {
1748                         kctl->tlv.c = snd_usb_mixer_vol_tlv;
1749                         kctl->vd[0].access |=
1750                                 SNDRV_CTL_ELEM_ACCESS_TLV_READ |
1751                                 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
1752                 }
1753         }
1754
1755         snd_usb_mixer_fu_apply_quirk(mixer, cval, unitid, kctl);
1756
1757         range = (cval->max - cval->min) / cval->res;
1758         /*
1759          * Are there devices with volume range more than 255? I use a bit more
1760          * to be sure. 384 is a resolution magic number found on Logitech
1761          * devices. It will definitively catch all buggy Logitech devices.
1762          */
1763         if (range > 384) {
1764                 usb_audio_warn(mixer->chip,
1765                                "Warning! Unlikely big volume range (=%u), cval->res is probably wrong.",
1766                                range);
1767                 usb_audio_warn(mixer->chip,
1768                                "[%d] FU [%s] ch = %d, val = %d/%d/%d",
1769                                cval->head.id, kctl->id.name, cval->channels,
1770                                cval->min, cval->max, cval->res);
1771         }
1772
1773         usb_audio_dbg(mixer->chip, "[%d] FU [%s] ch = %d, val = %d/%d/%d\n",
1774                       cval->head.id, kctl->id.name, cval->channels,
1775                       cval->min, cval->max, cval->res);
1776         snd_usb_mixer_add_control(&cval->head, kctl);
1777 }
1778
1779 static void build_feature_ctl(struct mixer_build *state, void *raw_desc,
1780                               unsigned int ctl_mask, int control,
1781                               struct usb_audio_term *iterm, int unitid,
1782                               int readonly_mask)
1783 {
1784         struct uac_feature_unit_descriptor *desc = raw_desc;
1785         int nameid = uac_feature_unit_iFeature(desc);
1786
1787         __build_feature_ctl(state->mixer, state->map, ctl_mask, control,
1788                         iterm, &state->oterm, unitid, nameid, readonly_mask);
1789 }
1790
1791 static void build_feature_ctl_badd(struct usb_mixer_interface *mixer,
1792                               unsigned int ctl_mask, int control, int unitid,
1793                               const struct usbmix_name_map *badd_map)
1794 {
1795         __build_feature_ctl(mixer, badd_map, ctl_mask, control,
1796                         NULL, NULL, unitid, 0, 0);
1797 }
1798
1799 static void get_connector_control_name(struct usb_mixer_interface *mixer,
1800                                        struct usb_audio_term *term,
1801                                        bool is_input, char *name, int name_size)
1802 {
1803         int name_len = get_term_name(mixer->chip, term, name, name_size, 0);
1804
1805         if (name_len == 0)
1806                 strscpy(name, "Unknown", name_size);
1807
1808         /*
1809          *  sound/core/ctljack.c has a convention of naming jack controls
1810          * by ending in " Jack".  Make it slightly more useful by
1811          * indicating Input or Output after the terminal name.
1812          */
1813         if (is_input)
1814                 strlcat(name, " - Input Jack", name_size);
1815         else
1816                 strlcat(name, " - Output Jack", name_size);
1817 }
1818
1819 /* Build a mixer control for a UAC connector control (jack-detect) */
1820 static void build_connector_control(struct usb_mixer_interface *mixer,
1821                                     const struct usbmix_name_map *imap,
1822                                     struct usb_audio_term *term, bool is_input)
1823 {
1824         struct snd_kcontrol *kctl;
1825         struct usb_mixer_elem_info *cval;
1826         const struct usbmix_name_map *map;
1827
1828         map = find_map(imap, term->id, 0);
1829         if (check_ignored_ctl(map))
1830                 return;
1831
1832         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1833         if (!cval)
1834                 return;
1835         snd_usb_mixer_elem_init_std(&cval->head, mixer, term->id);
1836         /*
1837          * UAC2: The first byte from reading the UAC2_TE_CONNECTOR control returns the
1838          * number of channels connected.
1839          *
1840          * UAC3: The first byte specifies size of bitmap for the inserted controls. The
1841          * following byte(s) specifies which connectors are inserted.
1842          *
1843          * This boolean ctl will simply report if any channels are connected
1844          * or not.
1845          */
1846         if (mixer->protocol == UAC_VERSION_2)
1847                 cval->control = UAC2_TE_CONNECTOR;
1848         else /* UAC_VERSION_3 */
1849                 cval->control = UAC3_TE_INSERTION;
1850
1851         cval->val_type = USB_MIXER_BOOLEAN;
1852         cval->channels = 1; /* report true if any channel is connected */
1853         cval->min = 0;
1854         cval->max = 1;
1855         kctl = snd_ctl_new1(&usb_connector_ctl_ro, cval);
1856         if (!kctl) {
1857                 usb_audio_err(mixer->chip, "cannot malloc kcontrol\n");
1858                 usb_mixer_elem_info_free(cval);
1859                 return;
1860         }
1861
1862         if (check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name)))
1863                 strlcat(kctl->id.name, " Jack", sizeof(kctl->id.name));
1864         else
1865                 get_connector_control_name(mixer, term, is_input, kctl->id.name,
1866                                            sizeof(kctl->id.name));
1867         kctl->private_free = snd_usb_mixer_elem_free;
1868         snd_usb_mixer_add_control(&cval->head, kctl);
1869 }
1870
1871 static int parse_clock_source_unit(struct mixer_build *state, int unitid,
1872                                    void *_ftr)
1873 {
1874         struct uac_clock_source_descriptor *hdr = _ftr;
1875         struct usb_mixer_elem_info *cval;
1876         struct snd_kcontrol *kctl;
1877         char name[SNDRV_CTL_ELEM_ID_NAME_MAXLEN];
1878         int ret;
1879
1880         if (state->mixer->protocol != UAC_VERSION_2)
1881                 return -EINVAL;
1882
1883         /*
1884          * The only property of this unit we are interested in is the
1885          * clock source validity. If that isn't readable, just bail out.
1886          */
1887         if (!uac_v2v3_control_is_readable(hdr->bmControls,
1888                                       UAC2_CS_CONTROL_CLOCK_VALID))
1889                 return 0;
1890
1891         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1892         if (!cval)
1893                 return -ENOMEM;
1894
1895         snd_usb_mixer_elem_init_std(&cval->head, state->mixer, hdr->bClockID);
1896
1897         cval->min = 0;
1898         cval->max = 1;
1899         cval->channels = 1;
1900         cval->val_type = USB_MIXER_BOOLEAN;
1901         cval->control = UAC2_CS_CONTROL_CLOCK_VALID;
1902
1903         cval->master_readonly = 1;
1904         /* From UAC2 5.2.5.1.2 "Only the get request is supported." */
1905         kctl = snd_ctl_new1(&usb_bool_master_control_ctl_ro, cval);
1906
1907         if (!kctl) {
1908                 usb_mixer_elem_info_free(cval);
1909                 return -ENOMEM;
1910         }
1911
1912         kctl->private_free = snd_usb_mixer_elem_free;
1913         ret = snd_usb_copy_string_desc(state->chip, hdr->iClockSource,
1914                                        name, sizeof(name));
1915         if (ret > 0)
1916                 snprintf(kctl->id.name, sizeof(kctl->id.name),
1917                          "%s Validity", name);
1918         else
1919                 snprintf(kctl->id.name, sizeof(kctl->id.name),
1920                          "Clock Source %d Validity", hdr->bClockID);
1921
1922         return snd_usb_mixer_add_control(&cval->head, kctl);
1923 }
1924
1925 /*
1926  * parse a feature unit
1927  *
1928  * most of controls are defined here.
1929  */
1930 static int parse_audio_feature_unit(struct mixer_build *state, int unitid,
1931                                     void *_ftr)
1932 {
1933         int channels, i, j;
1934         struct usb_audio_term iterm;
1935         unsigned int master_bits;
1936         int err, csize;
1937         struct uac_feature_unit_descriptor *hdr = _ftr;
1938         __u8 *bmaControls;
1939
1940         if (state->mixer->protocol == UAC_VERSION_1) {
1941                 csize = hdr->bControlSize;
1942                 channels = (hdr->bLength - 7) / csize - 1;
1943                 bmaControls = hdr->bmaControls;
1944         } else if (state->mixer->protocol == UAC_VERSION_2) {
1945                 struct uac2_feature_unit_descriptor *ftr = _ftr;
1946                 csize = 4;
1947                 channels = (hdr->bLength - 6) / 4 - 1;
1948                 bmaControls = ftr->bmaControls;
1949         } else { /* UAC_VERSION_3 */
1950                 struct uac3_feature_unit_descriptor *ftr = _ftr;
1951
1952                 csize = 4;
1953                 channels = (ftr->bLength - 7) / 4 - 1;
1954                 bmaControls = ftr->bmaControls;
1955         }
1956
1957         /* parse the source unit */
1958         err = parse_audio_unit(state, hdr->bSourceID);
1959         if (err < 0)
1960                 return err;
1961
1962         /* determine the input source type and name */
1963         err = check_input_term(state, hdr->bSourceID, &iterm);
1964         if (err < 0)
1965                 return err;
1966
1967         master_bits = snd_usb_combine_bytes(bmaControls, csize);
1968         /* master configuration quirks */
1969         switch (state->chip->usb_id) {
1970         case USB_ID(0x08bb, 0x2702):
1971                 usb_audio_info(state->chip,
1972                                "usbmixer: master volume quirk for PCM2702 chip\n");
1973                 /* disable non-functional volume control */
1974                 master_bits &= ~UAC_CONTROL_BIT(UAC_FU_VOLUME);
1975                 break;
1976         case USB_ID(0x1130, 0xf211):
1977                 usb_audio_info(state->chip,
1978                                "usbmixer: volume control quirk for Tenx TP6911 Audio Headset\n");
1979                 /* disable non-functional volume control */
1980                 channels = 0;
1981                 break;
1982
1983         }
1984
1985         if (state->mixer->protocol == UAC_VERSION_1) {
1986                 /* check all control types */
1987                 for (i = 0; i < 10; i++) {
1988                         unsigned int ch_bits = 0;
1989                         int control = audio_feature_info[i].control;
1990
1991                         for (j = 0; j < channels; j++) {
1992                                 unsigned int mask;
1993
1994                                 mask = snd_usb_combine_bytes(bmaControls +
1995                                                              csize * (j+1), csize);
1996                                 if (mask & (1 << i))
1997                                         ch_bits |= (1 << j);
1998                         }
1999                         /* audio class v1 controls are never read-only */
2000
2001                         /*
2002                          * The first channel must be set
2003                          * (for ease of programming).
2004                          */
2005                         if (ch_bits & 1)
2006                                 build_feature_ctl(state, _ftr, ch_bits, control,
2007                                                   &iterm, unitid, 0);
2008                         if (master_bits & (1 << i))
2009                                 build_feature_ctl(state, _ftr, 0, control,
2010                                                   &iterm, unitid, 0);
2011                 }
2012         } else { /* UAC_VERSION_2/3 */
2013                 for (i = 0; i < ARRAY_SIZE(audio_feature_info); i++) {
2014                         unsigned int ch_bits = 0;
2015                         unsigned int ch_read_only = 0;
2016                         int control = audio_feature_info[i].control;
2017
2018                         for (j = 0; j < channels; j++) {
2019                                 unsigned int mask;
2020
2021                                 mask = snd_usb_combine_bytes(bmaControls +
2022                                                              csize * (j+1), csize);
2023                                 if (uac_v2v3_control_is_readable(mask, control)) {
2024                                         ch_bits |= (1 << j);
2025                                         if (!uac_v2v3_control_is_writeable(mask, control))
2026                                                 ch_read_only |= (1 << j);
2027                                 }
2028                         }
2029
2030                         /*
2031                          * NOTE: build_feature_ctl() will mark the control
2032                          * read-only if all channels are marked read-only in
2033                          * the descriptors. Otherwise, the control will be
2034                          * reported as writeable, but the driver will not
2035                          * actually issue a write command for read-only
2036                          * channels.
2037                          */
2038
2039                         /*
2040                          * The first channel must be set
2041                          * (for ease of programming).
2042                          */
2043                         if (ch_bits & 1)
2044                                 build_feature_ctl(state, _ftr, ch_bits, control,
2045                                                   &iterm, unitid, ch_read_only);
2046                         if (uac_v2v3_control_is_readable(master_bits, control))
2047                                 build_feature_ctl(state, _ftr, 0, control,
2048                                                   &iterm, unitid,
2049                                                   !uac_v2v3_control_is_writeable(master_bits,
2050                                                                                  control));
2051                 }
2052         }
2053
2054         return 0;
2055 }
2056
2057 /*
2058  * Mixer Unit
2059  */
2060
2061 /* check whether the given in/out overflows bmMixerControls matrix */
2062 static bool mixer_bitmap_overflow(struct uac_mixer_unit_descriptor *desc,
2063                                   int protocol, int num_ins, int num_outs)
2064 {
2065         u8 *hdr = (u8 *)desc;
2066         u8 *c = uac_mixer_unit_bmControls(desc, protocol);
2067         size_t rest; /* remaining bytes after bmMixerControls */
2068
2069         switch (protocol) {
2070         case UAC_VERSION_1:
2071         default:
2072                 rest = 1; /* iMixer */
2073                 break;
2074         case UAC_VERSION_2:
2075                 rest = 2; /* bmControls + iMixer */
2076                 break;
2077         case UAC_VERSION_3:
2078                 rest = 6; /* bmControls + wMixerDescrStr */
2079                 break;
2080         }
2081
2082         /* overflow? */
2083         return c + (num_ins * num_outs + 7) / 8 + rest > hdr + hdr[0];
2084 }
2085
2086 /*
2087  * build a mixer unit control
2088  *
2089  * the callbacks are identical with feature unit.
2090  * input channel number (zero based) is given in control field instead.
2091  */
2092 static void build_mixer_unit_ctl(struct mixer_build *state,
2093                                  struct uac_mixer_unit_descriptor *desc,
2094                                  int in_pin, int in_ch, int num_outs,
2095                                  int unitid, struct usb_audio_term *iterm)
2096 {
2097         struct usb_mixer_elem_info *cval;
2098         unsigned int i, len;
2099         struct snd_kcontrol *kctl;
2100         const struct usbmix_name_map *map;
2101
2102         map = find_map(state->map, unitid, 0);
2103         if (check_ignored_ctl(map))
2104                 return;
2105
2106         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
2107         if (!cval)
2108                 return;
2109
2110         snd_usb_mixer_elem_init_std(&cval->head, state->mixer, unitid);
2111         cval->control = in_ch + 1; /* based on 1 */
2112         cval->val_type = USB_MIXER_S16;
2113         for (i = 0; i < num_outs; i++) {
2114                 __u8 *c = uac_mixer_unit_bmControls(desc, state->mixer->protocol);
2115
2116                 if (check_matrix_bitmap(c, in_ch, i, num_outs)) {
2117                         cval->cmask |= (1 << i);
2118                         cval->channels++;
2119                 }
2120         }
2121
2122         /* get min/max values */
2123         get_min_max(cval, 0);
2124
2125         kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
2126         if (!kctl) {
2127                 usb_audio_err(state->chip, "cannot malloc kcontrol\n");
2128                 usb_mixer_elem_info_free(cval);
2129                 return;
2130         }
2131         kctl->private_free = snd_usb_mixer_elem_free;
2132
2133         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
2134         if (!len)
2135                 len = get_term_name(state->chip, iterm, kctl->id.name,
2136                                     sizeof(kctl->id.name), 0);
2137         if (!len)
2138                 len = sprintf(kctl->id.name, "Mixer Source %d", in_ch + 1);
2139         append_ctl_name(kctl, " Volume");
2140
2141         usb_audio_dbg(state->chip, "[%d] MU [%s] ch = %d, val = %d/%d\n",
2142                     cval->head.id, kctl->id.name, cval->channels, cval->min, cval->max);
2143         snd_usb_mixer_add_control(&cval->head, kctl);
2144 }
2145
2146 static int parse_audio_input_terminal(struct mixer_build *state, int unitid,
2147                                       void *raw_desc)
2148 {
2149         struct usb_audio_term iterm;
2150         unsigned int control, bmctls, term_id;
2151
2152         if (state->mixer->protocol == UAC_VERSION_2) {
2153                 struct uac2_input_terminal_descriptor *d_v2 = raw_desc;
2154                 control = UAC2_TE_CONNECTOR;
2155                 term_id = d_v2->bTerminalID;
2156                 bmctls = le16_to_cpu(d_v2->bmControls);
2157         } else if (state->mixer->protocol == UAC_VERSION_3) {
2158                 struct uac3_input_terminal_descriptor *d_v3 = raw_desc;
2159                 control = UAC3_TE_INSERTION;
2160                 term_id = d_v3->bTerminalID;
2161                 bmctls = le32_to_cpu(d_v3->bmControls);
2162         } else {
2163                 return 0; /* UAC1. No Insertion control */
2164         }
2165
2166         check_input_term(state, term_id, &iterm);
2167
2168         /* Check for jack detection. */
2169         if ((iterm.type & 0xff00) != 0x0100 &&
2170             uac_v2v3_control_is_readable(bmctls, control))
2171                 build_connector_control(state->mixer, state->map, &iterm, true);
2172
2173         return 0;
2174 }
2175
2176 /*
2177  * parse a mixer unit
2178  */
2179 static int parse_audio_mixer_unit(struct mixer_build *state, int unitid,
2180                                   void *raw_desc)
2181 {
2182         struct uac_mixer_unit_descriptor *desc = raw_desc;
2183         struct usb_audio_term iterm;
2184         int input_pins, num_ins, num_outs;
2185         int pin, ich, err;
2186
2187         err = uac_mixer_unit_get_channels(state, desc);
2188         if (err < 0) {
2189                 usb_audio_err(state->chip,
2190                               "invalid MIXER UNIT descriptor %d\n",
2191                               unitid);
2192                 return err;
2193         }
2194
2195         num_outs = err;
2196         input_pins = desc->bNrInPins;
2197
2198         num_ins = 0;
2199         ich = 0;
2200         for (pin = 0; pin < input_pins; pin++) {
2201                 err = parse_audio_unit(state, desc->baSourceID[pin]);
2202                 if (err < 0)
2203                         continue;
2204                 /* no bmControls field (e.g. Maya44) -> ignore */
2205                 if (!num_outs)
2206                         continue;
2207                 err = check_input_term(state, desc->baSourceID[pin], &iterm);
2208                 if (err < 0)
2209                         return err;
2210                 num_ins += iterm.channels;
2211                 if (mixer_bitmap_overflow(desc, state->mixer->protocol,
2212                                           num_ins, num_outs))
2213                         break;
2214                 for (; ich < num_ins; ich++) {
2215                         int och, ich_has_controls = 0;
2216
2217                         for (och = 0; och < num_outs; och++) {
2218                                 __u8 *c = uac_mixer_unit_bmControls(desc,
2219                                                 state->mixer->protocol);
2220
2221                                 if (check_matrix_bitmap(c, ich, och, num_outs)) {
2222                                         ich_has_controls = 1;
2223                                         break;
2224                                 }
2225                         }
2226                         if (ich_has_controls)
2227                                 build_mixer_unit_ctl(state, desc, pin, ich, num_outs,
2228                                                      unitid, &iterm);
2229                 }
2230         }
2231         return 0;
2232 }
2233
2234 /*
2235  * Processing Unit / Extension Unit
2236  */
2237
2238 /* get callback for processing/extension unit */
2239 static int mixer_ctl_procunit_get(struct snd_kcontrol *kcontrol,
2240                                   struct snd_ctl_elem_value *ucontrol)
2241 {
2242         struct usb_mixer_elem_info *cval = kcontrol->private_data;
2243         int err, val;
2244
2245         err = get_cur_ctl_value(cval, cval->control << 8, &val);
2246         if (err < 0) {
2247                 ucontrol->value.integer.value[0] = cval->min;
2248                 return filter_error(cval, err);
2249         }
2250         val = get_relative_value(cval, val);
2251         ucontrol->value.integer.value[0] = val;
2252         return 0;
2253 }
2254
2255 /* put callback for processing/extension unit */
2256 static int mixer_ctl_procunit_put(struct snd_kcontrol *kcontrol,
2257                                   struct snd_ctl_elem_value *ucontrol)
2258 {
2259         struct usb_mixer_elem_info *cval = kcontrol->private_data;
2260         int val, oval, err;
2261
2262         err = get_cur_ctl_value(cval, cval->control << 8, &oval);
2263         if (err < 0)
2264                 return filter_error(cval, err);
2265         val = ucontrol->value.integer.value[0];
2266         val = get_abs_value(cval, val);
2267         if (val != oval) {
2268                 set_cur_ctl_value(cval, cval->control << 8, val);
2269                 return 1;
2270         }
2271         return 0;
2272 }
2273
2274 /* alsa control interface for processing/extension unit */
2275 static const struct snd_kcontrol_new mixer_procunit_ctl = {
2276         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
2277         .name = "", /* will be filled later */
2278         .info = mixer_ctl_feature_info,
2279         .get = mixer_ctl_procunit_get,
2280         .put = mixer_ctl_procunit_put,
2281 };
2282
2283 /*
2284  * predefined data for processing units
2285  */
2286 struct procunit_value_info {
2287         int control;
2288         const char *suffix;
2289         int val_type;
2290         int min_value;
2291 };
2292
2293 struct procunit_info {
2294         int type;
2295         char *name;
2296         const struct procunit_value_info *values;
2297 };
2298
2299 static const struct procunit_value_info undefined_proc_info[] = {
2300         { 0x00, "Control Undefined", 0 },
2301         { 0 }
2302 };
2303
2304 static const struct procunit_value_info updown_proc_info[] = {
2305         { UAC_UD_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2306         { UAC_UD_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
2307         { 0 }
2308 };
2309 static const struct procunit_value_info prologic_proc_info[] = {
2310         { UAC_DP_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2311         { UAC_DP_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
2312         { 0 }
2313 };
2314 static const struct procunit_value_info threed_enh_proc_info[] = {
2315         { UAC_3D_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2316         { UAC_3D_SPACE, "Spaciousness", USB_MIXER_U8 },
2317         { 0 }
2318 };
2319 static const struct procunit_value_info reverb_proc_info[] = {
2320         { UAC_REVERB_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2321         { UAC_REVERB_LEVEL, "Level", USB_MIXER_U8 },
2322         { UAC_REVERB_TIME, "Time", USB_MIXER_U16 },
2323         { UAC_REVERB_FEEDBACK, "Feedback", USB_MIXER_U8 },
2324         { 0 }
2325 };
2326 static const struct procunit_value_info chorus_proc_info[] = {
2327         { UAC_CHORUS_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2328         { UAC_CHORUS_LEVEL, "Level", USB_MIXER_U8 },
2329         { UAC_CHORUS_RATE, "Rate", USB_MIXER_U16 },
2330         { UAC_CHORUS_DEPTH, "Depth", USB_MIXER_U16 },
2331         { 0 }
2332 };
2333 static const struct procunit_value_info dcr_proc_info[] = {
2334         { UAC_DCR_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2335         { UAC_DCR_RATE, "Ratio", USB_MIXER_U16 },
2336         { UAC_DCR_MAXAMPL, "Max Amp", USB_MIXER_S16 },
2337         { UAC_DCR_THRESHOLD, "Threshold", USB_MIXER_S16 },
2338         { UAC_DCR_ATTACK_TIME, "Attack Time", USB_MIXER_U16 },
2339         { UAC_DCR_RELEASE_TIME, "Release Time", USB_MIXER_U16 },
2340         { 0 }
2341 };
2342
2343 static const struct procunit_info procunits[] = {
2344         { UAC_PROCESS_UP_DOWNMIX, "Up Down", updown_proc_info },
2345         { UAC_PROCESS_DOLBY_PROLOGIC, "Dolby Prologic", prologic_proc_info },
2346         { UAC_PROCESS_STEREO_EXTENDER, "3D Stereo Extender", threed_enh_proc_info },
2347         { UAC_PROCESS_REVERB, "Reverb", reverb_proc_info },
2348         { UAC_PROCESS_CHORUS, "Chorus", chorus_proc_info },
2349         { UAC_PROCESS_DYN_RANGE_COMP, "DCR", dcr_proc_info },
2350         { 0 },
2351 };
2352
2353 static const struct procunit_value_info uac3_updown_proc_info[] = {
2354         { UAC3_UD_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
2355         { 0 }
2356 };
2357 static const struct procunit_value_info uac3_stereo_ext_proc_info[] = {
2358         { UAC3_EXT_WIDTH_CONTROL, "Width Control", USB_MIXER_U8 },
2359         { 0 }
2360 };
2361
2362 static const struct procunit_info uac3_procunits[] = {
2363         { UAC3_PROCESS_UP_DOWNMIX, "Up Down", uac3_updown_proc_info },
2364         { UAC3_PROCESS_STEREO_EXTENDER, "3D Stereo Extender", uac3_stereo_ext_proc_info },
2365         { UAC3_PROCESS_MULTI_FUNCTION, "Multi-Function", undefined_proc_info },
2366         { 0 },
2367 };
2368
2369 /*
2370  * predefined data for extension units
2371  */
2372 static const struct procunit_value_info clock_rate_xu_info[] = {
2373         { USB_XU_CLOCK_RATE_SELECTOR, "Selector", USB_MIXER_U8, 0 },
2374         { 0 }
2375 };
2376 static const struct procunit_value_info clock_source_xu_info[] = {
2377         { USB_XU_CLOCK_SOURCE_SELECTOR, "External", USB_MIXER_BOOLEAN },
2378         { 0 }
2379 };
2380 static const struct procunit_value_info spdif_format_xu_info[] = {
2381         { USB_XU_DIGITAL_FORMAT_SELECTOR, "SPDIF/AC3", USB_MIXER_BOOLEAN },
2382         { 0 }
2383 };
2384 static const struct procunit_value_info soft_limit_xu_info[] = {
2385         { USB_XU_SOFT_LIMIT_SELECTOR, " ", USB_MIXER_BOOLEAN },
2386         { 0 }
2387 };
2388 static const struct procunit_info extunits[] = {
2389         { USB_XU_CLOCK_RATE, "Clock rate", clock_rate_xu_info },
2390         { USB_XU_CLOCK_SOURCE, "DigitalIn CLK source", clock_source_xu_info },
2391         { USB_XU_DIGITAL_IO_STATUS, "DigitalOut format:", spdif_format_xu_info },
2392         { USB_XU_DEVICE_OPTIONS, "AnalogueIn Soft Limit", soft_limit_xu_info },
2393         { 0 }
2394 };
2395
2396 /*
2397  * build a processing/extension unit
2398  */
2399 static int build_audio_procunit(struct mixer_build *state, int unitid,
2400                                 void *raw_desc, const struct procunit_info *list,
2401                                 bool extension_unit)
2402 {
2403         struct uac_processing_unit_descriptor *desc = raw_desc;
2404         int num_ins;
2405         struct usb_mixer_elem_info *cval;
2406         struct snd_kcontrol *kctl;
2407         int i, err, nameid, type, len, val;
2408         const struct procunit_info *info;
2409         const struct procunit_value_info *valinfo;
2410         const struct usbmix_name_map *map;
2411         static const struct procunit_value_info default_value_info[] = {
2412                 { 0x01, "Switch", USB_MIXER_BOOLEAN },
2413                 { 0 }
2414         };
2415         static const struct procunit_info default_info = {
2416                 0, NULL, default_value_info
2417         };
2418         const char *name = extension_unit ?
2419                 "Extension Unit" : "Processing Unit";
2420
2421         num_ins = desc->bNrInPins;
2422         for (i = 0; i < num_ins; i++) {
2423                 err = parse_audio_unit(state, desc->baSourceID[i]);
2424                 if (err < 0)
2425                         return err;
2426         }
2427
2428         type = le16_to_cpu(desc->wProcessType);
2429         for (info = list; info && info->type; info++)
2430                 if (info->type == type)
2431                         break;
2432         if (!info || !info->type)
2433                 info = &default_info;
2434
2435         for (valinfo = info->values; valinfo->control; valinfo++) {
2436                 __u8 *controls = uac_processing_unit_bmControls(desc, state->mixer->protocol);
2437
2438                 if (state->mixer->protocol == UAC_VERSION_1) {
2439                         if (!(controls[valinfo->control / 8] &
2440                                         (1 << ((valinfo->control % 8) - 1))))
2441                                 continue;
2442                 } else { /* UAC_VERSION_2/3 */
2443                         if (!uac_v2v3_control_is_readable(controls[valinfo->control / 8],
2444                                                           valinfo->control))
2445                                 continue;
2446                 }
2447
2448                 map = find_map(state->map, unitid, valinfo->control);
2449                 if (check_ignored_ctl(map))
2450                         continue;
2451                 cval = kzalloc(sizeof(*cval), GFP_KERNEL);
2452                 if (!cval)
2453                         return -ENOMEM;
2454                 snd_usb_mixer_elem_init_std(&cval->head, state->mixer, unitid);
2455                 cval->control = valinfo->control;
2456                 cval->val_type = valinfo->val_type;
2457                 cval->channels = 1;
2458
2459                 if (state->mixer->protocol > UAC_VERSION_1 &&
2460                     !uac_v2v3_control_is_writeable(controls[valinfo->control / 8],
2461                                                    valinfo->control))
2462                         cval->master_readonly = 1;
2463
2464                 /* get min/max values */
2465                 switch (type) {
2466                 case UAC_PROCESS_UP_DOWNMIX: {
2467                         bool mode_sel = false;
2468
2469                         switch (state->mixer->protocol) {
2470                         case UAC_VERSION_1:
2471                         case UAC_VERSION_2:
2472                         default:
2473                                 if (cval->control == UAC_UD_MODE_SELECT)
2474                                         mode_sel = true;
2475                                 break;
2476                         case UAC_VERSION_3:
2477                                 if (cval->control == UAC3_UD_MODE_SELECT)
2478                                         mode_sel = true;
2479                                 break;
2480                         }
2481
2482                         if (mode_sel) {
2483                                 __u8 *control_spec = uac_processing_unit_specific(desc,
2484                                                                 state->mixer->protocol);
2485                                 cval->min = 1;
2486                                 cval->max = control_spec[0];
2487                                 cval->res = 1;
2488                                 cval->initialized = 1;
2489                                 break;
2490                         }
2491
2492                         get_min_max(cval, valinfo->min_value);
2493                         break;
2494                 }
2495                 case USB_XU_CLOCK_RATE:
2496                         /*
2497                          * E-Mu USB 0404/0202/TrackerPre/0204
2498                          * samplerate control quirk
2499                          */
2500                         cval->min = 0;
2501                         cval->max = 5;
2502                         cval->res = 1;
2503                         cval->initialized = 1;
2504                         break;
2505                 default:
2506                         get_min_max(cval, valinfo->min_value);
2507                         break;
2508                 }
2509
2510                 err = get_cur_ctl_value(cval, cval->control << 8, &val);
2511                 if (err < 0) {
2512                         usb_mixer_elem_info_free(cval);
2513                         return -EINVAL;
2514                 }
2515
2516                 kctl = snd_ctl_new1(&mixer_procunit_ctl, cval);
2517                 if (!kctl) {
2518                         usb_mixer_elem_info_free(cval);
2519                         return -ENOMEM;
2520                 }
2521                 kctl->private_free = snd_usb_mixer_elem_free;
2522
2523                 if (check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name))) {
2524                         /* nothing */ ;
2525                 } else if (info->name) {
2526                         strscpy(kctl->id.name, info->name, sizeof(kctl->id.name));
2527                 } else {
2528                         if (extension_unit)
2529                                 nameid = uac_extension_unit_iExtension(desc, state->mixer->protocol);
2530                         else
2531                                 nameid = uac_processing_unit_iProcessing(desc, state->mixer->protocol);
2532                         len = 0;
2533                         if (nameid)
2534                                 len = snd_usb_copy_string_desc(state->chip,
2535                                                                nameid,
2536                                                                kctl->id.name,
2537                                                                sizeof(kctl->id.name));
2538                         if (!len)
2539                                 strscpy(kctl->id.name, name, sizeof(kctl->id.name));
2540                 }
2541                 append_ctl_name(kctl, " ");
2542                 append_ctl_name(kctl, valinfo->suffix);
2543
2544                 usb_audio_dbg(state->chip,
2545                               "[%d] PU [%s] ch = %d, val = %d/%d\n",
2546                               cval->head.id, kctl->id.name, cval->channels,
2547                               cval->min, cval->max);
2548
2549                 err = snd_usb_mixer_add_control(&cval->head, kctl);
2550                 if (err < 0)
2551                         return err;
2552         }
2553         return 0;
2554 }
2555
2556 static int parse_audio_processing_unit(struct mixer_build *state, int unitid,
2557                                        void *raw_desc)
2558 {
2559         switch (state->mixer->protocol) {
2560         case UAC_VERSION_1:
2561         case UAC_VERSION_2:
2562         default:
2563                 return build_audio_procunit(state, unitid, raw_desc,
2564                                             procunits, false);
2565         case UAC_VERSION_3:
2566                 return build_audio_procunit(state, unitid, raw_desc,
2567                                             uac3_procunits, false);
2568         }
2569 }
2570
2571 static int parse_audio_extension_unit(struct mixer_build *state, int unitid,
2572                                       void *raw_desc)
2573 {
2574         /*
2575          * Note that we parse extension units with processing unit descriptors.
2576          * That's ok as the layout is the same.
2577          */
2578         return build_audio_procunit(state, unitid, raw_desc, extunits, true);
2579 }
2580
2581 /*
2582  * Selector Unit
2583  */
2584
2585 /*
2586  * info callback for selector unit
2587  * use an enumerator type for routing
2588  */
2589 static int mixer_ctl_selector_info(struct snd_kcontrol *kcontrol,
2590                                    struct snd_ctl_elem_info *uinfo)
2591 {
2592         struct usb_mixer_elem_info *cval = kcontrol->private_data;
2593         const char **itemlist = (const char **)kcontrol->private_value;
2594
2595         if (snd_BUG_ON(!itemlist))
2596                 return -EINVAL;
2597         return snd_ctl_enum_info(uinfo, 1, cval->max, itemlist);
2598 }
2599
2600 /* get callback for selector unit */
2601 static int mixer_ctl_selector_get(struct snd_kcontrol *kcontrol,
2602                                   struct snd_ctl_elem_value *ucontrol)
2603 {
2604         struct usb_mixer_elem_info *cval = kcontrol->private_data;
2605         int val, err;
2606
2607         err = get_cur_ctl_value(cval, cval->control << 8, &val);
2608         if (err < 0) {
2609                 ucontrol->value.enumerated.item[0] = 0;
2610                 return filter_error(cval, err);
2611         }
2612         val = get_relative_value(cval, val);
2613         ucontrol->value.enumerated.item[0] = val;
2614         return 0;
2615 }
2616
2617 /* put callback for selector unit */
2618 static int mixer_ctl_selector_put(struct snd_kcontrol *kcontrol,
2619                                   struct snd_ctl_elem_value *ucontrol)
2620 {
2621         struct usb_mixer_elem_info *cval = kcontrol->private_data;
2622         int val, oval, err;
2623
2624         err = get_cur_ctl_value(cval, cval->control << 8, &oval);
2625         if (err < 0)
2626                 return filter_error(cval, err);
2627         val = ucontrol->value.enumerated.item[0];
2628         val = get_abs_value(cval, val);
2629         if (val != oval) {
2630                 set_cur_ctl_value(cval, cval->control << 8, val);
2631                 return 1;
2632         }
2633         return 0;
2634 }
2635
2636 /* alsa control interface for selector unit */
2637 static const struct snd_kcontrol_new mixer_selectunit_ctl = {
2638         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
2639         .name = "", /* will be filled later */
2640         .info = mixer_ctl_selector_info,
2641         .get = mixer_ctl_selector_get,
2642         .put = mixer_ctl_selector_put,
2643 };
2644
2645 /*
2646  * private free callback.
2647  * free both private_data and private_value
2648  */
2649 static void usb_mixer_selector_elem_free(struct snd_kcontrol *kctl)
2650 {
2651         int i, num_ins = 0;
2652
2653         if (kctl->private_data) {
2654                 struct usb_mixer_elem_info *cval = kctl->private_data;
2655                 num_ins = cval->max;
2656                 usb_mixer_elem_info_free(cval);
2657                 kctl->private_data = NULL;
2658         }
2659         if (kctl->private_value) {
2660                 char **itemlist = (char **)kctl->private_value;
2661                 for (i = 0; i < num_ins; i++)
2662                         kfree(itemlist[i]);
2663                 kfree(itemlist);
2664                 kctl->private_value = 0;
2665         }
2666 }
2667
2668 /*
2669  * parse a selector unit
2670  */
2671 static int parse_audio_selector_unit(struct mixer_build *state, int unitid,
2672                                      void *raw_desc)
2673 {
2674         struct uac_selector_unit_descriptor *desc = raw_desc;
2675         unsigned int i, nameid, len;
2676         int err;
2677         struct usb_mixer_elem_info *cval;
2678         struct snd_kcontrol *kctl;
2679         const struct usbmix_name_map *map;
2680         char **namelist;
2681
2682         for (i = 0; i < desc->bNrInPins; i++) {
2683                 err = parse_audio_unit(state, desc->baSourceID[i]);
2684                 if (err < 0)
2685                         return err;
2686         }
2687
2688         if (desc->bNrInPins == 1) /* only one ? nonsense! */
2689                 return 0;
2690
2691         map = find_map(state->map, unitid, 0);
2692         if (check_ignored_ctl(map))
2693                 return 0;
2694
2695         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
2696         if (!cval)
2697                 return -ENOMEM;
2698         snd_usb_mixer_elem_init_std(&cval->head, state->mixer, unitid);
2699         cval->val_type = USB_MIXER_U8;
2700         cval->channels = 1;
2701         cval->min = 1;
2702         cval->max = desc->bNrInPins;
2703         cval->res = 1;
2704         cval->initialized = 1;
2705
2706         switch (state->mixer->protocol) {
2707         case UAC_VERSION_1:
2708         default:
2709                 cval->control = 0;
2710                 break;
2711         case UAC_VERSION_2:
2712         case UAC_VERSION_3:
2713                 if (desc->bDescriptorSubtype == UAC2_CLOCK_SELECTOR ||
2714                     desc->bDescriptorSubtype == UAC3_CLOCK_SELECTOR)
2715                         cval->control = UAC2_CX_CLOCK_SELECTOR;
2716                 else /* UAC2/3_SELECTOR_UNIT */
2717                         cval->control = UAC2_SU_SELECTOR;
2718                 break;
2719         }
2720
2721         namelist = kcalloc(desc->bNrInPins, sizeof(char *), GFP_KERNEL);
2722         if (!namelist) {
2723                 err = -ENOMEM;
2724                 goto error_cval;
2725         }
2726 #define MAX_ITEM_NAME_LEN       64
2727         for (i = 0; i < desc->bNrInPins; i++) {
2728                 struct usb_audio_term iterm;
2729                 namelist[i] = kmalloc(MAX_ITEM_NAME_LEN, GFP_KERNEL);
2730                 if (!namelist[i]) {
2731                         err = -ENOMEM;
2732                         goto error_name;
2733                 }
2734                 len = check_mapped_selector_name(state, unitid, i, namelist[i],
2735                                                  MAX_ITEM_NAME_LEN);
2736                 if (! len && check_input_term(state, desc->baSourceID[i], &iterm) >= 0)
2737                         len = get_term_name(state->chip, &iterm, namelist[i],
2738                                             MAX_ITEM_NAME_LEN, 0);
2739                 if (! len)
2740                         sprintf(namelist[i], "Input %u", i);
2741         }
2742
2743         kctl = snd_ctl_new1(&mixer_selectunit_ctl, cval);
2744         if (! kctl) {
2745                 usb_audio_err(state->chip, "cannot malloc kcontrol\n");
2746                 err = -ENOMEM;
2747                 goto error_name;
2748         }
2749         kctl->private_value = (unsigned long)namelist;
2750         kctl->private_free = usb_mixer_selector_elem_free;
2751
2752         /* check the static mapping table at first */
2753         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
2754         if (!len) {
2755                 /* no mapping ? */
2756                 switch (state->mixer->protocol) {
2757                 case UAC_VERSION_1:
2758                 case UAC_VERSION_2:
2759                 default:
2760                 /* if iSelector is given, use it */
2761                         nameid = uac_selector_unit_iSelector(desc);
2762                         if (nameid)
2763                                 len = snd_usb_copy_string_desc(state->chip,
2764                                                         nameid, kctl->id.name,
2765                                                         sizeof(kctl->id.name));
2766                         break;
2767                 case UAC_VERSION_3:
2768                         /* TODO: Class-Specific strings not yet supported */
2769                         break;
2770                 }
2771
2772                 /* ... or pick up the terminal name at next */
2773                 if (!len)
2774                         len = get_term_name(state->chip, &state->oterm,
2775                                     kctl->id.name, sizeof(kctl->id.name), 0);
2776                 /* ... or use the fixed string "USB" as the last resort */
2777                 if (!len)
2778                         strscpy(kctl->id.name, "USB", sizeof(kctl->id.name));
2779
2780                 /* and add the proper suffix */
2781                 if (desc->bDescriptorSubtype == UAC2_CLOCK_SELECTOR ||
2782                     desc->bDescriptorSubtype == UAC3_CLOCK_SELECTOR)
2783                         append_ctl_name(kctl, " Clock Source");
2784                 else if ((state->oterm.type & 0xff00) == 0x0100)
2785                         append_ctl_name(kctl, " Capture Source");
2786                 else
2787                         append_ctl_name(kctl, " Playback Source");
2788         }
2789
2790         usb_audio_dbg(state->chip, "[%d] SU [%s] items = %d\n",
2791                     cval->head.id, kctl->id.name, desc->bNrInPins);
2792         return snd_usb_mixer_add_control(&cval->head, kctl);
2793
2794  error_name:
2795         for (i = 0; i < desc->bNrInPins; i++)
2796                 kfree(namelist[i]);
2797         kfree(namelist);
2798  error_cval:
2799         usb_mixer_elem_info_free(cval);
2800         return err;
2801 }
2802
2803 /*
2804  * parse an audio unit recursively
2805  */
2806
2807 static int parse_audio_unit(struct mixer_build *state, int unitid)
2808 {
2809         unsigned char *p1;
2810         int protocol = state->mixer->protocol;
2811
2812         if (test_and_set_bit(unitid, state->unitbitmap))
2813                 return 0; /* the unit already visited */
2814
2815         p1 = find_audio_control_unit(state, unitid);
2816         if (!p1) {
2817                 usb_audio_err(state->chip, "unit %d not found!\n", unitid);
2818                 return -EINVAL;
2819         }
2820
2821         if (!snd_usb_validate_audio_desc(p1, protocol)) {
2822                 usb_audio_dbg(state->chip, "invalid unit %d\n", unitid);
2823                 return 0; /* skip invalid unit */
2824         }
2825
2826         switch (PTYPE(protocol, p1[2])) {
2827         case PTYPE(UAC_VERSION_1, UAC_INPUT_TERMINAL):
2828         case PTYPE(UAC_VERSION_2, UAC_INPUT_TERMINAL):
2829         case PTYPE(UAC_VERSION_3, UAC_INPUT_TERMINAL):
2830                 return parse_audio_input_terminal(state, unitid, p1);
2831         case PTYPE(UAC_VERSION_1, UAC_MIXER_UNIT):
2832         case PTYPE(UAC_VERSION_2, UAC_MIXER_UNIT):
2833         case PTYPE(UAC_VERSION_3, UAC3_MIXER_UNIT):
2834                 return parse_audio_mixer_unit(state, unitid, p1);
2835         case PTYPE(UAC_VERSION_2, UAC2_CLOCK_SOURCE):
2836         case PTYPE(UAC_VERSION_3, UAC3_CLOCK_SOURCE):
2837                 return parse_clock_source_unit(state, unitid, p1);
2838         case PTYPE(UAC_VERSION_1, UAC_SELECTOR_UNIT):
2839         case PTYPE(UAC_VERSION_2, UAC_SELECTOR_UNIT):
2840         case PTYPE(UAC_VERSION_3, UAC3_SELECTOR_UNIT):
2841         case PTYPE(UAC_VERSION_2, UAC2_CLOCK_SELECTOR):
2842         case PTYPE(UAC_VERSION_3, UAC3_CLOCK_SELECTOR):
2843                 return parse_audio_selector_unit(state, unitid, p1);
2844         case PTYPE(UAC_VERSION_1, UAC_FEATURE_UNIT):
2845         case PTYPE(UAC_VERSION_2, UAC_FEATURE_UNIT):
2846         case PTYPE(UAC_VERSION_3, UAC3_FEATURE_UNIT):
2847                 return parse_audio_feature_unit(state, unitid, p1);
2848         case PTYPE(UAC_VERSION_1, UAC1_PROCESSING_UNIT):
2849         case PTYPE(UAC_VERSION_2, UAC2_PROCESSING_UNIT_V2):
2850         case PTYPE(UAC_VERSION_3, UAC3_PROCESSING_UNIT):
2851                 return parse_audio_processing_unit(state, unitid, p1);
2852         case PTYPE(UAC_VERSION_1, UAC1_EXTENSION_UNIT):
2853         case PTYPE(UAC_VERSION_2, UAC2_EXTENSION_UNIT_V2):
2854         case PTYPE(UAC_VERSION_3, UAC3_EXTENSION_UNIT):
2855                 return parse_audio_extension_unit(state, unitid, p1);
2856         case PTYPE(UAC_VERSION_2, UAC2_EFFECT_UNIT):
2857         case PTYPE(UAC_VERSION_3, UAC3_EFFECT_UNIT):
2858                 return 0; /* FIXME - effect units not implemented yet */
2859         default:
2860                 usb_audio_err(state->chip,
2861                               "unit %u: unexpected type 0x%02x\n",
2862                               unitid, p1[2]);
2863                 return -EINVAL;
2864         }
2865 }
2866
2867 static void snd_usb_mixer_free(struct usb_mixer_interface *mixer)
2868 {
2869         /* kill pending URBs */
2870         snd_usb_mixer_disconnect(mixer);
2871
2872         kfree(mixer->id_elems);
2873         if (mixer->urb) {
2874                 kfree(mixer->urb->transfer_buffer);
2875                 usb_free_urb(mixer->urb);
2876         }
2877         usb_free_urb(mixer->rc_urb);
2878         kfree(mixer->rc_setup_packet);
2879         kfree(mixer);
2880 }
2881
2882 static int snd_usb_mixer_dev_free(struct snd_device *device)
2883 {
2884         struct usb_mixer_interface *mixer = device->device_data;
2885         snd_usb_mixer_free(mixer);
2886         return 0;
2887 }
2888
2889 /* UAC3 predefined channels configuration */
2890 struct uac3_badd_profile {
2891         int subclass;
2892         const char *name;
2893         int c_chmask;   /* capture channels mask */
2894         int p_chmask;   /* playback channels mask */
2895         int st_chmask;  /* side tone mixing channel mask */
2896 };
2897
2898 static const struct uac3_badd_profile uac3_badd_profiles[] = {
2899         {
2900                 /*
2901                  * BAIF, BAOF or combination of both
2902                  * IN: Mono or Stereo cfg, Mono alt possible
2903                  * OUT: Mono or Stereo cfg, Mono alt possible
2904                  */
2905                 .subclass = UAC3_FUNCTION_SUBCLASS_GENERIC_IO,
2906                 .name = "GENERIC IO",
2907                 .c_chmask = -1,         /* dynamic channels */
2908                 .p_chmask = -1,         /* dynamic channels */
2909         },
2910         {
2911                 /* BAOF; Stereo only cfg, Mono alt possible */
2912                 .subclass = UAC3_FUNCTION_SUBCLASS_HEADPHONE,
2913                 .name = "HEADPHONE",
2914                 .p_chmask = 3,
2915         },
2916         {
2917                 /* BAOF; Mono or Stereo cfg, Mono alt possible */
2918                 .subclass = UAC3_FUNCTION_SUBCLASS_SPEAKER,
2919                 .name = "SPEAKER",
2920                 .p_chmask = -1,         /* dynamic channels */
2921         },
2922         {
2923                 /* BAIF; Mono or Stereo cfg, Mono alt possible */
2924                 .subclass = UAC3_FUNCTION_SUBCLASS_MICROPHONE,
2925                 .name = "MICROPHONE",
2926                 .c_chmask = -1,         /* dynamic channels */
2927         },
2928         {
2929                 /*
2930                  * BAIOF topology
2931                  * IN: Mono only
2932                  * OUT: Mono or Stereo cfg, Mono alt possible
2933                  */
2934                 .subclass = UAC3_FUNCTION_SUBCLASS_HEADSET,
2935                 .name = "HEADSET",
2936                 .c_chmask = 1,
2937                 .p_chmask = -1,         /* dynamic channels */
2938                 .st_chmask = 1,
2939         },
2940         {
2941                 /* BAIOF; IN: Mono only; OUT: Stereo only, Mono alt possible */
2942                 .subclass = UAC3_FUNCTION_SUBCLASS_HEADSET_ADAPTER,
2943                 .name = "HEADSET ADAPTER",
2944                 .c_chmask = 1,
2945                 .p_chmask = 3,
2946                 .st_chmask = 1,
2947         },
2948         {
2949                 /* BAIF + BAOF; IN: Mono only; OUT: Mono only */
2950                 .subclass = UAC3_FUNCTION_SUBCLASS_SPEAKERPHONE,
2951                 .name = "SPEAKERPHONE",
2952                 .c_chmask = 1,
2953                 .p_chmask = 1,
2954         },
2955         { 0 } /* terminator */
2956 };
2957
2958 static bool uac3_badd_func_has_valid_channels(struct usb_mixer_interface *mixer,
2959                                               const struct uac3_badd_profile *f,
2960                                               int c_chmask, int p_chmask)
2961 {
2962         /*
2963          * If both playback/capture channels are dynamic, make sure
2964          * at least one channel is present
2965          */
2966         if (f->c_chmask < 0 && f->p_chmask < 0) {
2967                 if (!c_chmask && !p_chmask) {
2968                         usb_audio_warn(mixer->chip, "BAAD %s: no channels?",
2969                                        f->name);
2970                         return false;
2971                 }
2972                 return true;
2973         }
2974
2975         if ((f->c_chmask < 0 && !c_chmask) ||
2976             (f->c_chmask >= 0 && f->c_chmask != c_chmask)) {
2977                 usb_audio_warn(mixer->chip, "BAAD %s c_chmask mismatch",
2978                                f->name);
2979                 return false;
2980         }
2981         if ((f->p_chmask < 0 && !p_chmask) ||
2982             (f->p_chmask >= 0 && f->p_chmask != p_chmask)) {
2983                 usb_audio_warn(mixer->chip, "BAAD %s p_chmask mismatch",
2984                                f->name);
2985                 return false;
2986         }
2987         return true;
2988 }
2989
2990 /*
2991  * create mixer controls for UAC3 BADD profiles
2992  *
2993  * UAC3 BADD device doesn't contain CS descriptors thus we will guess everything
2994  *
2995  * BADD device may contain Mixer Unit, which doesn't have any controls, skip it
2996  */
2997 static int snd_usb_mixer_controls_badd(struct usb_mixer_interface *mixer,
2998                                        int ctrlif)
2999 {
3000         struct usb_device *dev = mixer->chip->dev;
3001         struct usb_interface_assoc_descriptor *assoc;
3002         int badd_profile = mixer->chip->badd_profile;
3003         const struct uac3_badd_profile *f;
3004         const struct usbmix_ctl_map *map;
3005         int p_chmask = 0, c_chmask = 0, st_chmask = 0;
3006         int i;
3007
3008         assoc = usb_ifnum_to_if(dev, ctrlif)->intf_assoc;
3009
3010         /* Detect BADD capture/playback channels from AS EP descriptors */
3011         for (i = 0; i < assoc->bInterfaceCount; i++) {
3012                 int intf = assoc->bFirstInterface + i;
3013
3014                 struct usb_interface *iface;
3015                 struct usb_host_interface *alts;
3016                 struct usb_interface_descriptor *altsd;
3017                 unsigned int maxpacksize;
3018                 char dir_in;
3019                 int chmask, num;
3020
3021                 if (intf == ctrlif)
3022                         continue;
3023
3024                 iface = usb_ifnum_to_if(dev, intf);
3025                 if (!iface)
3026                         continue;
3027
3028                 num = iface->num_altsetting;
3029
3030                 if (num < 2)
3031                         return -EINVAL;
3032
3033                 /*
3034                  * The number of Channels in an AudioStreaming interface
3035                  * and the audio sample bit resolution (16 bits or 24
3036                  * bits) can be derived from the wMaxPacketSize field in
3037                  * the Standard AS Audio Data Endpoint descriptor in
3038                  * Alternate Setting 1
3039                  */
3040                 alts = &iface->altsetting[1];
3041                 altsd = get_iface_desc(alts);
3042
3043                 if (altsd->bNumEndpoints < 1)
3044                         return -EINVAL;
3045
3046                 /* check direction */
3047                 dir_in = (get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN);
3048                 maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
3049
3050                 switch (maxpacksize) {
3051                 default:
3052                         usb_audio_err(mixer->chip,
3053                                 "incorrect wMaxPacketSize 0x%x for BADD profile\n",
3054                                 maxpacksize);
3055                         return -EINVAL;
3056                 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_16:
3057                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_16:
3058                 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_24:
3059                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_24:
3060                         chmask = 1;
3061                         break;
3062                 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_16:
3063                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_16:
3064                 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_24:
3065                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_24:
3066                         chmask = 3;
3067                         break;
3068                 }
3069
3070                 if (dir_in)
3071                         c_chmask = chmask;
3072                 else
3073                         p_chmask = chmask;
3074         }
3075
3076         usb_audio_dbg(mixer->chip,
3077                 "UAC3 BADD profile 0x%x: detected c_chmask=%d p_chmask=%d\n",
3078                 badd_profile, c_chmask, p_chmask);
3079
3080         /* check the mapping table */
3081         for (map = uac3_badd_usbmix_ctl_maps; map->id; map++) {
3082                 if (map->id == badd_profile)
3083                         break;
3084         }
3085
3086         if (!map->id)
3087                 return -EINVAL;
3088
3089         for (f = uac3_badd_profiles; f->name; f++) {
3090                 if (badd_profile == f->subclass)
3091                         break;
3092         }
3093         if (!f->name)
3094                 return -EINVAL;
3095         if (!uac3_badd_func_has_valid_channels(mixer, f, c_chmask, p_chmask))
3096                 return -EINVAL;
3097         st_chmask = f->st_chmask;
3098
3099         /* Playback */
3100         if (p_chmask) {
3101                 /* Master channel, always writable */
3102                 build_feature_ctl_badd(mixer, 0, UAC_FU_MUTE,
3103                                        UAC3_BADD_FU_ID2, map->map);
3104                 /* Mono/Stereo volume channels, always writable */
3105                 build_feature_ctl_badd(mixer, p_chmask, UAC_FU_VOLUME,
3106                                        UAC3_BADD_FU_ID2, map->map);
3107         }
3108
3109         /* Capture */
3110         if (c_chmask) {
3111                 /* Master channel, always writable */
3112                 build_feature_ctl_badd(mixer, 0, UAC_FU_MUTE,
3113                                        UAC3_BADD_FU_ID5, map->map);
3114                 /* Mono/Stereo volume channels, always writable */
3115                 build_feature_ctl_badd(mixer, c_chmask, UAC_FU_VOLUME,
3116                                        UAC3_BADD_FU_ID5, map->map);
3117         }
3118
3119         /* Side tone-mixing */
3120         if (st_chmask) {
3121                 /* Master channel, always writable */
3122                 build_feature_ctl_badd(mixer, 0, UAC_FU_MUTE,
3123                                        UAC3_BADD_FU_ID7, map->map);
3124                 /* Mono volume channel, always writable */
3125                 build_feature_ctl_badd(mixer, 1, UAC_FU_VOLUME,
3126                                        UAC3_BADD_FU_ID7, map->map);
3127         }
3128
3129         /* Insertion Control */
3130         if (f->subclass == UAC3_FUNCTION_SUBCLASS_HEADSET_ADAPTER) {
3131                 struct usb_audio_term iterm, oterm;
3132
3133                 /* Input Term - Insertion control */
3134                 memset(&iterm, 0, sizeof(iterm));
3135                 iterm.id = UAC3_BADD_IT_ID4;
3136                 iterm.type = UAC_BIDIR_TERMINAL_HEADSET;
3137                 build_connector_control(mixer, map->map, &iterm, true);
3138
3139                 /* Output Term - Insertion control */
3140                 memset(&oterm, 0, sizeof(oterm));
3141                 oterm.id = UAC3_BADD_OT_ID3;
3142                 oterm.type = UAC_BIDIR_TERMINAL_HEADSET;
3143                 build_connector_control(mixer, map->map, &oterm, false);
3144         }
3145
3146         return 0;
3147 }
3148
3149 /*
3150  * create mixer controls
3151  *
3152  * walk through all UAC_OUTPUT_TERMINAL descriptors to search for mixers
3153  */
3154 static int snd_usb_mixer_controls(struct usb_mixer_interface *mixer)
3155 {
3156         struct mixer_build state;
3157         int err;
3158         const struct usbmix_ctl_map *map;
3159         void *p;
3160
3161         memset(&state, 0, sizeof(state));
3162         state.chip = mixer->chip;
3163         state.mixer = mixer;
3164         state.buffer = mixer->hostif->extra;
3165         state.buflen = mixer->hostif->extralen;
3166
3167         /* check the mapping table */
3168         for (map = usbmix_ctl_maps; map->id; map++) {
3169                 if (map->id == state.chip->usb_id) {
3170                         state.map = map->map;
3171                         state.selector_map = map->selector_map;
3172                         mixer->connector_map = map->connector_map;
3173                         mixer->ignore_ctl_error |= map->ignore_ctl_error;
3174                         break;
3175                 }
3176         }
3177
3178         p = NULL;
3179         while ((p = snd_usb_find_csint_desc(mixer->hostif->extra,
3180                                             mixer->hostif->extralen,
3181                                             p, UAC_OUTPUT_TERMINAL)) != NULL) {
3182                 if (!snd_usb_validate_audio_desc(p, mixer->protocol))
3183                         continue; /* skip invalid descriptor */
3184
3185                 if (mixer->protocol == UAC_VERSION_1) {
3186                         struct uac1_output_terminal_descriptor *desc = p;
3187
3188                         /* mark terminal ID as visited */
3189                         set_bit(desc->bTerminalID, state.unitbitmap);
3190                         state.oterm.id = desc->bTerminalID;
3191                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
3192                         state.oterm.name = desc->iTerminal;
3193                         err = parse_audio_unit(&state, desc->bSourceID);
3194                         if (err < 0 && err != -EINVAL)
3195                                 return err;
3196                 } else if (mixer->protocol == UAC_VERSION_2) {
3197                         struct uac2_output_terminal_descriptor *desc = p;
3198
3199                         /* mark terminal ID as visited */
3200                         set_bit(desc->bTerminalID, state.unitbitmap);
3201                         state.oterm.id = desc->bTerminalID;
3202                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
3203                         state.oterm.name = desc->iTerminal;
3204                         err = parse_audio_unit(&state, desc->bSourceID);
3205                         if (err < 0 && err != -EINVAL)
3206                                 return err;
3207
3208                         /*
3209                          * For UAC2, use the same approach to also add the
3210                          * clock selectors
3211                          */
3212                         err = parse_audio_unit(&state, desc->bCSourceID);
3213                         if (err < 0 && err != -EINVAL)
3214                                 return err;
3215
3216                         if ((state.oterm.type & 0xff00) != 0x0100 &&
3217                             uac_v2v3_control_is_readable(le16_to_cpu(desc->bmControls),
3218                                                          UAC2_TE_CONNECTOR)) {
3219                                 build_connector_control(state.mixer, state.map,
3220                                                         &state.oterm, false);
3221                         }
3222                 } else {  /* UAC_VERSION_3 */
3223                         struct uac3_output_terminal_descriptor *desc = p;
3224
3225                         /* mark terminal ID as visited */
3226                         set_bit(desc->bTerminalID, state.unitbitmap);
3227                         state.oterm.id = desc->bTerminalID;
3228                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
3229                         state.oterm.name = le16_to_cpu(desc->wTerminalDescrStr);
3230                         err = parse_audio_unit(&state, desc->bSourceID);
3231                         if (err < 0 && err != -EINVAL)
3232                                 return err;
3233
3234                         /*
3235                          * For UAC3, use the same approach to also add the
3236                          * clock selectors
3237                          */
3238                         err = parse_audio_unit(&state, desc->bCSourceID);
3239                         if (err < 0 && err != -EINVAL)
3240                                 return err;
3241
3242                         if ((state.oterm.type & 0xff00) != 0x0100 &&
3243                             uac_v2v3_control_is_readable(le32_to_cpu(desc->bmControls),
3244                                                          UAC3_TE_INSERTION)) {
3245                                 build_connector_control(state.mixer, state.map,
3246                                                         &state.oterm, false);
3247                         }
3248                 }
3249         }
3250
3251         return 0;
3252 }
3253
3254 static int delegate_notify(struct usb_mixer_interface *mixer, int unitid,
3255                            u8 *control, u8 *channel)
3256 {
3257         const struct usbmix_connector_map *map = mixer->connector_map;
3258
3259         if (!map)
3260                 return unitid;
3261
3262         for (; map->id; map++) {
3263                 if (map->id == unitid) {
3264                         if (control && map->control)
3265                                 *control = map->control;
3266                         if (channel && map->channel)
3267                                 *channel = map->channel;
3268                         return map->delegated_id;
3269                 }
3270         }
3271         return unitid;
3272 }
3273
3274 void snd_usb_mixer_notify_id(struct usb_mixer_interface *mixer, int unitid)
3275 {
3276         struct usb_mixer_elem_list *list;
3277
3278         unitid = delegate_notify(mixer, unitid, NULL, NULL);
3279
3280         for_each_mixer_elem(list, mixer, unitid) {
3281                 struct usb_mixer_elem_info *info;
3282
3283                 if (!list->is_std_info)
3284                         continue;
3285                 info = mixer_elem_list_to_info(list);
3286                 /* invalidate cache, so the value is read from the device */
3287                 info->cached = 0;
3288                 snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
3289                                &list->kctl->id);
3290         }
3291 }
3292
3293 static void snd_usb_mixer_dump_cval(struct snd_info_buffer *buffer,
3294                                     struct usb_mixer_elem_list *list)
3295 {
3296         struct usb_mixer_elem_info *cval = mixer_elem_list_to_info(list);
3297         static const char * const val_types[] = {
3298                 [USB_MIXER_BOOLEAN] = "BOOLEAN",
3299                 [USB_MIXER_INV_BOOLEAN] = "INV_BOOLEAN",
3300                 [USB_MIXER_S8] = "S8",
3301                 [USB_MIXER_U8] = "U8",
3302                 [USB_MIXER_S16] = "S16",
3303                 [USB_MIXER_U16] = "U16",
3304                 [USB_MIXER_S32] = "S32",
3305                 [USB_MIXER_U32] = "U32",
3306                 [USB_MIXER_BESPOKEN] = "BESPOKEN",
3307         };
3308         snd_iprintf(buffer, "    Info: id=%i, control=%i, cmask=0x%x, "
3309                             "channels=%i, type=\"%s\"\n", cval->head.id,
3310                             cval->control, cval->cmask, cval->channels,
3311                             val_types[cval->val_type]);
3312         snd_iprintf(buffer, "    Volume: min=%i, max=%i, dBmin=%i, dBmax=%i\n",
3313                             cval->min, cval->max, cval->dBmin, cval->dBmax);
3314 }
3315
3316 static void snd_usb_mixer_proc_read(struct snd_info_entry *entry,
3317                                     struct snd_info_buffer *buffer)
3318 {
3319         struct snd_usb_audio *chip = entry->private_data;
3320         struct usb_mixer_interface *mixer;
3321         struct usb_mixer_elem_list *list;
3322         int unitid;
3323
3324         list_for_each_entry(mixer, &chip->mixer_list, list) {
3325                 snd_iprintf(buffer,
3326                         "USB Mixer: usb_id=0x%08x, ctrlif=%i, ctlerr=%i\n",
3327                                 chip->usb_id, mixer_ctrl_intf(mixer),
3328                                 mixer->ignore_ctl_error);
3329                 snd_iprintf(buffer, "Card: %s\n", chip->card->longname);
3330                 for (unitid = 0; unitid < MAX_ID_ELEMS; unitid++) {
3331                         for_each_mixer_elem(list, mixer, unitid) {
3332                                 snd_iprintf(buffer, "  Unit: %i\n", list->id);
3333                                 if (list->kctl)
3334                                         snd_iprintf(buffer,
3335                                                     "    Control: name=\"%s\", index=%i\n",
3336                                                     list->kctl->id.name,
3337                                                     list->kctl->id.index);
3338                                 if (list->dump)
3339                                         list->dump(buffer, list);
3340                         }
3341                 }
3342         }
3343 }
3344
3345 static void snd_usb_mixer_interrupt_v2(struct usb_mixer_interface *mixer,
3346                                        int attribute, int value, int index)
3347 {
3348         struct usb_mixer_elem_list *list;
3349         __u8 unitid = (index >> 8) & 0xff;
3350         __u8 control = (value >> 8) & 0xff;
3351         __u8 channel = value & 0xff;
3352         unsigned int count = 0;
3353
3354         if (channel >= MAX_CHANNELS) {
3355                 usb_audio_dbg(mixer->chip,
3356                         "%s(): bogus channel number %d\n",
3357                         __func__, channel);
3358                 return;
3359         }
3360
3361         unitid = delegate_notify(mixer, unitid, &control, &channel);
3362
3363         for_each_mixer_elem(list, mixer, unitid)
3364                 count++;
3365
3366         if (count == 0)
3367                 return;
3368
3369         for_each_mixer_elem(list, mixer, unitid) {
3370                 struct usb_mixer_elem_info *info;
3371
3372                 if (!list->kctl)
3373                         continue;
3374                 if (!list->is_std_info)
3375                         continue;
3376
3377                 info = mixer_elem_list_to_info(list);
3378                 if (count > 1 && info->control != control)
3379                         continue;
3380
3381                 switch (attribute) {
3382                 case UAC2_CS_CUR:
3383                         /* invalidate cache, so the value is read from the device */
3384                         if (channel)
3385                                 info->cached &= ~(1 << channel);
3386                         else /* master channel */
3387                                 info->cached = 0;
3388
3389                         snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
3390                                        &info->head.kctl->id);
3391                         break;
3392
3393                 case UAC2_CS_RANGE:
3394                         /* TODO */
3395                         break;
3396
3397                 case UAC2_CS_MEM:
3398                         /* TODO */
3399                         break;
3400
3401                 default:
3402                         usb_audio_dbg(mixer->chip,
3403                                 "unknown attribute %d in interrupt\n",
3404                                 attribute);
3405                         break;
3406                 } /* switch */
3407         }
3408 }
3409
3410 static void snd_usb_mixer_interrupt(struct urb *urb)
3411 {
3412         struct usb_mixer_interface *mixer = urb->context;
3413         int len = urb->actual_length;
3414         int ustatus = urb->status;
3415
3416         if (ustatus != 0)
3417                 goto requeue;
3418
3419         if (mixer->protocol == UAC_VERSION_1) {
3420                 struct uac1_status_word *status;
3421
3422                 for (status = urb->transfer_buffer;
3423                      len >= sizeof(*status);
3424                      len -= sizeof(*status), status++) {
3425                         dev_dbg(&urb->dev->dev, "status interrupt: %02x %02x\n",
3426                                                 status->bStatusType,
3427                                                 status->bOriginator);
3428
3429                         /* ignore any notifications not from the control interface */
3430                         if ((status->bStatusType & UAC1_STATUS_TYPE_ORIG_MASK) !=
3431                                 UAC1_STATUS_TYPE_ORIG_AUDIO_CONTROL_IF)
3432                                 continue;
3433
3434                         if (status->bStatusType & UAC1_STATUS_TYPE_MEM_CHANGED)
3435                                 snd_usb_mixer_rc_memory_change(mixer, status->bOriginator);
3436                         else
3437                                 snd_usb_mixer_notify_id(mixer, status->bOriginator);
3438                 }
3439         } else { /* UAC_VERSION_2 */
3440                 struct uac2_interrupt_data_msg *msg;
3441
3442                 for (msg = urb->transfer_buffer;
3443                      len >= sizeof(*msg);
3444                      len -= sizeof(*msg), msg++) {
3445                         /* drop vendor specific and endpoint requests */
3446                         if ((msg->bInfo & UAC2_INTERRUPT_DATA_MSG_VENDOR) ||
3447                             (msg->bInfo & UAC2_INTERRUPT_DATA_MSG_EP))
3448                                 continue;
3449
3450                         snd_usb_mixer_interrupt_v2(mixer, msg->bAttribute,
3451                                                    le16_to_cpu(msg->wValue),
3452                                                    le16_to_cpu(msg->wIndex));
3453                 }
3454         }
3455
3456 requeue:
3457         if (ustatus != -ENOENT &&
3458             ustatus != -ECONNRESET &&
3459             ustatus != -ESHUTDOWN) {
3460                 urb->dev = mixer->chip->dev;
3461                 usb_submit_urb(urb, GFP_ATOMIC);
3462         }
3463 }
3464
3465 /* create the handler for the optional status interrupt endpoint */
3466 static int snd_usb_mixer_status_create(struct usb_mixer_interface *mixer)
3467 {
3468         struct usb_endpoint_descriptor *ep;
3469         void *transfer_buffer;
3470         int buffer_length;
3471         unsigned int epnum;
3472
3473         /* we need one interrupt input endpoint */
3474         if (get_iface_desc(mixer->hostif)->bNumEndpoints < 1)
3475                 return 0;
3476         ep = get_endpoint(mixer->hostif, 0);
3477         if (!usb_endpoint_dir_in(ep) || !usb_endpoint_xfer_int(ep))
3478                 return 0;
3479
3480         epnum = usb_endpoint_num(ep);
3481         buffer_length = le16_to_cpu(ep->wMaxPacketSize);
3482         transfer_buffer = kmalloc(buffer_length, GFP_KERNEL);
3483         if (!transfer_buffer)
3484                 return -ENOMEM;
3485         mixer->urb = usb_alloc_urb(0, GFP_KERNEL);
3486         if (!mixer->urb) {
3487                 kfree(transfer_buffer);
3488                 return -ENOMEM;
3489         }
3490         usb_fill_int_urb(mixer->urb, mixer->chip->dev,
3491                          usb_rcvintpipe(mixer->chip->dev, epnum),
3492                          transfer_buffer, buffer_length,
3493                          snd_usb_mixer_interrupt, mixer, ep->bInterval);
3494         usb_submit_urb(mixer->urb, GFP_KERNEL);
3495         return 0;
3496 }
3497
3498 int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif,
3499                          int ignore_error)
3500 {
3501         static const struct snd_device_ops dev_ops = {
3502                 .dev_free = snd_usb_mixer_dev_free
3503         };
3504         struct usb_mixer_interface *mixer;
3505         int err;
3506
3507         strcpy(chip->card->mixername, "USB Mixer");
3508
3509         mixer = kzalloc(sizeof(*mixer), GFP_KERNEL);
3510         if (!mixer)
3511                 return -ENOMEM;
3512         mixer->chip = chip;
3513         mixer->ignore_ctl_error = ignore_error;
3514         mixer->id_elems = kcalloc(MAX_ID_ELEMS, sizeof(*mixer->id_elems),
3515                                   GFP_KERNEL);
3516         if (!mixer->id_elems) {
3517                 kfree(mixer);
3518                 return -ENOMEM;
3519         }
3520
3521         mixer->hostif = &usb_ifnum_to_if(chip->dev, ctrlif)->altsetting[0];
3522         switch (get_iface_desc(mixer->hostif)->bInterfaceProtocol) {
3523         case UAC_VERSION_1:
3524         default:
3525                 mixer->protocol = UAC_VERSION_1;
3526                 break;
3527         case UAC_VERSION_2:
3528                 mixer->protocol = UAC_VERSION_2;
3529                 break;
3530         case UAC_VERSION_3:
3531                 mixer->protocol = UAC_VERSION_3;
3532                 break;
3533         }
3534
3535         if (mixer->protocol == UAC_VERSION_3 &&
3536                         chip->badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) {
3537                 err = snd_usb_mixer_controls_badd(mixer, ctrlif);
3538                 if (err < 0)
3539                         goto _error;
3540         } else {
3541                 err = snd_usb_mixer_controls(mixer);
3542                 if (err < 0)
3543                         goto _error;
3544         }
3545
3546         err = snd_usb_mixer_status_create(mixer);
3547         if (err < 0)
3548                 goto _error;
3549
3550         err = snd_usb_mixer_apply_create_quirk(mixer);
3551         if (err < 0)
3552                 goto _error;
3553
3554         err = snd_device_new(chip->card, SNDRV_DEV_CODEC, mixer, &dev_ops);
3555         if (err < 0)
3556                 goto _error;
3557
3558         if (list_empty(&chip->mixer_list))
3559                 snd_card_ro_proc_new(chip->card, "usbmixer", chip,
3560                                      snd_usb_mixer_proc_read);
3561
3562         list_add(&mixer->list, &chip->mixer_list);
3563         return 0;
3564
3565 _error:
3566         snd_usb_mixer_free(mixer);
3567         return err;
3568 }
3569
3570 void snd_usb_mixer_disconnect(struct usb_mixer_interface *mixer)
3571 {
3572         if (mixer->disconnected)
3573                 return;
3574         if (mixer->urb)
3575                 usb_kill_urb(mixer->urb);
3576         if (mixer->rc_urb)
3577                 usb_kill_urb(mixer->rc_urb);
3578         if (mixer->private_free)
3579                 mixer->private_free(mixer);
3580         mixer->disconnected = true;
3581 }
3582
3583 #ifdef CONFIG_PM
3584 /* stop any bus activity of a mixer */
3585 static void snd_usb_mixer_inactivate(struct usb_mixer_interface *mixer)
3586 {
3587         usb_kill_urb(mixer->urb);
3588         usb_kill_urb(mixer->rc_urb);
3589 }
3590
3591 static int snd_usb_mixer_activate(struct usb_mixer_interface *mixer)
3592 {
3593         int err;
3594
3595         if (mixer->urb) {
3596                 err = usb_submit_urb(mixer->urb, GFP_NOIO);
3597                 if (err < 0)
3598                         return err;
3599         }
3600
3601         return 0;
3602 }
3603
3604 int snd_usb_mixer_suspend(struct usb_mixer_interface *mixer)
3605 {
3606         snd_usb_mixer_inactivate(mixer);
3607         if (mixer->private_suspend)
3608                 mixer->private_suspend(mixer);
3609         return 0;
3610 }
3611
3612 static int restore_mixer_value(struct usb_mixer_elem_list *list)
3613 {
3614         struct usb_mixer_elem_info *cval = mixer_elem_list_to_info(list);
3615         int c, err, idx;
3616
3617         if (cval->val_type == USB_MIXER_BESPOKEN)
3618                 return 0;
3619
3620         if (cval->cmask) {
3621                 idx = 0;
3622                 for (c = 0; c < MAX_CHANNELS; c++) {
3623                         if (!(cval->cmask & (1 << c)))
3624                                 continue;
3625                         if (cval->cached & (1 << (c + 1))) {
3626                                 err = snd_usb_set_cur_mix_value(cval, c + 1, idx,
3627                                                         cval->cache_val[idx]);
3628                                 if (err < 0)
3629                                         return err;
3630                         }
3631                         idx++;
3632                 }
3633         } else {
3634                 /* master */
3635                 if (cval->cached) {
3636                         err = snd_usb_set_cur_mix_value(cval, 0, 0, *cval->cache_val);
3637                         if (err < 0)
3638                                 return err;
3639                 }
3640         }
3641
3642         return 0;
3643 }
3644
3645 static int default_mixer_resume(struct usb_mixer_elem_list *list)
3646 {
3647         struct usb_mixer_elem_info *cval = mixer_elem_list_to_info(list);
3648
3649         /* get connector value to "wake up" the USB audio */
3650         if (cval->val_type == USB_MIXER_BOOLEAN && cval->channels == 1)
3651                 get_connector_value(cval, NULL, NULL);
3652
3653         return 0;
3654 }
3655
3656 static int default_mixer_reset_resume(struct usb_mixer_elem_list *list)
3657 {
3658         int err = default_mixer_resume(list);
3659
3660         if (err < 0)
3661                 return err;
3662         return restore_mixer_value(list);
3663 }
3664
3665 int snd_usb_mixer_resume(struct usb_mixer_interface *mixer, bool reset_resume)
3666 {
3667         struct usb_mixer_elem_list *list;
3668         usb_mixer_elem_resume_func_t f;
3669         int id, err;
3670
3671         /* restore cached mixer values */
3672         for (id = 0; id < MAX_ID_ELEMS; id++) {
3673                 for_each_mixer_elem(list, mixer, id) {
3674                         if (reset_resume)
3675                                 f = list->reset_resume;
3676                         else
3677                                 f = list->resume;
3678                         if (f) {
3679                                 err = f(list);
3680                                 if (err < 0)
3681                                         return err;
3682                         }
3683                 }
3684         }
3685
3686         snd_usb_mixer_resume_quirk(mixer);
3687
3688         return snd_usb_mixer_activate(mixer);
3689 }
3690 #endif
3691
3692 void snd_usb_mixer_elem_init_std(struct usb_mixer_elem_list *list,
3693                                  struct usb_mixer_interface *mixer,
3694                                  int unitid)
3695 {
3696         list->mixer = mixer;
3697         list->id = unitid;
3698         list->dump = snd_usb_mixer_dump_cval;
3699 #ifdef CONFIG_PM
3700         list->resume = default_mixer_resume;
3701         list->reset_resume = default_mixer_reset_resume;
3702 #endif
3703 }