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->min_mute = p->dB->min_mute;
 149                 cval->initialized = 1;
 150         }
 151 }
 152
 153 /* get the mapped selector source name */
 154 static int check_mapped_selector_name(struct mixer_build *state, int unitid,
 155                                       int index, char *buf, int buflen)
 156 {
 157         const struct usbmix_selector_map *p;
 158         int len;
 159
 160         if (!state->selector_map)
 161                 return 0;
 162         for (p = state->selector_map; p->id; p++) {
 163                 if (p->id == unitid && index < p->count) {
 164                         len = strscpy(buf, p->names[index], buflen);
 165                         return len < 0 ? buflen : len;
 166                 }
 167         }
 168         return 0;
 169 }
 170
 171 /*
 172  * find an audio control unit with the given unit id
 173  */
 174 static void *find_audio_control_unit(struct mixer_build *state,
 175                                      unsigned char unit)
 176 {
 177         /* we just parse the header */
 178         struct uac_feature_unit_descriptor *hdr = NULL;
 179
 180         while ((hdr = snd_usb_find_desc(state->buffer, state->buflen, hdr,
 181                                         USB_DT_CS_INTERFACE)) != NULL) {
 182                 if (hdr->bLength >= 4 &&
 183                     hdr->bDescriptorSubtype >= UAC_INPUT_TERMINAL &&
 184                     hdr->bDescriptorSubtype <= UAC3_SAMPLE_RATE_CONVERTER &&
 185                     hdr->bUnitID == unit)
 186                         return hdr;
 187         }
 188
 189         return NULL;
 190 }
 191
 192 /*
 193  * copy a string with the given id
 194  */
 195 static int snd_usb_copy_string_desc(struct snd_usb_audio *chip,
 196                                     int index, char *buf, int maxlen)
 197 {
 198         int len = usb_string(chip->dev, index, buf, maxlen - 1);
 199
 200         if (len < 0)
 201                 return 0;
 202
 203         buf[len] = 0;
 204         return len;
 205 }
 206
 207 /*
 208  * convert from the byte/word on usb descriptor to the zero-based integer
 209  */
 210 static int convert_signed_value(struct usb_mixer_elem_info *cval, int val)
 211 {
 212         switch (cval->val_type) {
 213         case USB_MIXER_BOOLEAN:
 214                 return !!val;
 215         case USB_MIXER_INV_BOOLEAN:
 216                 return !val;
 217         case USB_MIXER_U8:
 218                 val &= 0xff;
 219                 break;
 220         case USB_MIXER_S8:
 221                 val &= 0xff;
 222                 if (val >= 0x80)
 223                         val -= 0x100;
 224                 break;
 225         case USB_MIXER_U16:
 226                 val &= 0xffff;
 227                 break;
 228         case USB_MIXER_S16:
 229                 val &= 0xffff;
 230                 if (val >= 0x8000)
 231                         val -= 0x10000;
 232                 break;
 233         }
 234         return val;
 235 }
 236
 237 /*
 238  * convert from the zero-based int to the byte/word for usb descriptor
 239  */
 240 static int convert_bytes_value(struct usb_mixer_elem_info *cval, int val)
 241 {
 242         switch (cval->val_type) {
 243         case USB_MIXER_BOOLEAN:
 244                 return !!val;
 245         case USB_MIXER_INV_BOOLEAN:
 246                 return !val;
 247         case USB_MIXER_S8:
 248         case USB_MIXER_U8:
 249                 return val & 0xff;
 250         case USB_MIXER_S16:
 251         case USB_MIXER_U16:
 252                 return val & 0xffff;
 253         }
 254         return 0; /* not reached */
 255 }
 256
 257 static int get_relative_value(struct usb_mixer_elem_info *cval, int val)
 258 {
 259         if (!cval->res)
 260                 cval->res = 1;
 261         if (val < cval->min)
 262                 return 0;
 263         else if (val >= cval->max)
 264                 return DIV_ROUND_UP(cval->max - cval->min, cval->res);
 265         else
 266                 return (val - cval->min) / cval->res;
 267 }
 268
 269 static int get_abs_value(struct usb_mixer_elem_info *cval, int val)
 270 {
 271         if (val < 0)
 272                 return cval->min;
 273         if (!cval->res)
 274                 cval->res = 1;
 275         val *= cval->res;
 276         val += cval->min;
 277         if (val > cval->max)
 278                 return cval->max;
 279         return val;
 280 }
 281
 282 static int uac2_ctl_value_size(int val_type)
 283 {
 284         switch (val_type) {
 285         case USB_MIXER_S32:
 286         case USB_MIXER_U32:
 287                 return 4;
 288         case USB_MIXER_S16:
 289         case USB_MIXER_U16:
 290                 return 2;
 291         default:
 292                 return 1;
 293         }
 294         return 0; /* unreachable */
 295 }
 296
 297
 298 /*
 299  * retrieve a mixer value
 300  */
 301
 302 static inline int mixer_ctrl_intf(struct usb_mixer_interface *mixer)
 303 {
 304         return get_iface_desc(mixer->hostif)->bInterfaceNumber;
 305 }
 306
 307 static int get_ctl_value_v1(struct usb_mixer_elem_info *cval, int request,
 308                             int validx, int *value_ret)
 309 {
 310         struct snd_usb_audio *chip = cval->head.mixer->chip;
 311         unsigned char buf[2];
 312         int val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
 313         int timeout = 10;
 314         int idx = 0, err;
 315
 316         err = snd_usb_lock_shutdown(chip);
 317         if (err < 0)
 318                 return -EIO;
 319
 320         while (timeout-- > 0) {
 321                 idx = mixer_ctrl_intf(cval->head.mixer) | (cval->head.id << 8);
 322                 err = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), request,
 323                                       USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
 324                                       validx, idx, buf, val_len);
 325                 if (err >= val_len) {
 326                         *value_ret = convert_signed_value(cval, snd_usb_combine_bytes(buf, val_len));
 327                         err = 0;
 328                         goto out;
 329                 } else if (err == -ETIMEDOUT) {
 330                         goto out;
 331                 }
 332         }
 333         usb_audio_dbg(chip,
 334                 "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
 335                 request, validx, idx, cval->val_type);
 336         err = -EINVAL;
 337
 338  out:
 339         snd_usb_unlock_shutdown(chip);
 340         return err;
 341 }
 342
 343 static int get_ctl_value_v2(struct usb_mixer_elem_info *cval, int request,
 344                             int validx, int *value_ret)
 345 {
 346         struct snd_usb_audio *chip = cval->head.mixer->chip;
 347         /* enough space for one range */
 348         unsigned char buf[sizeof(__u16) + 3 * sizeof(__u32)];
 349         unsigned char *val;
 350         int idx = 0, ret, val_size, size;
 351         __u8 bRequest;
 352
 353         val_size = uac2_ctl_value_size(cval->val_type);
 354
 355         if (request == UAC_GET_CUR) {
 356                 bRequest = UAC2_CS_CUR;
 357                 size = val_size;
 358         } else {
 359                 bRequest = UAC2_CS_RANGE;
 360                 size = sizeof(__u16) + 3 * val_size;
 361         }
 362
 363         memset(buf, 0, sizeof(buf));
 364
 365         if (snd_usb_lock_shutdown(chip))
 366                 return -EIO;
 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                 usb_audio_dbg(chip,
 376                         "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
 377                         request, validx, idx, cval->val_type);
 378                 return ret;
 379         }
 380
 381         /* FIXME: how should we handle multiple triplets here? */
 382
 383         switch (request) {
 384         case UAC_GET_CUR:
 385                 val = buf;
 386                 break;
 387         case UAC_GET_MIN:
 388                 val = buf + sizeof(__u16);
 389                 break;
 390         case UAC_GET_MAX:
 391                 val = buf + sizeof(__u16) + val_size;
 392                 break;
 393         case UAC_GET_RES:
 394                 val = buf + sizeof(__u16) + val_size * 2;
 395                 break;
 396         default:
 397                 return -EINVAL;
 398         }
 399
 400         *value_ret = convert_signed_value(cval,
 401                                           snd_usb_combine_bytes(val, val_size));
 402
 403         return 0;
 404 }
 405
 406 static int get_ctl_value(struct usb_mixer_elem_info *cval, int request,
 407                          int validx, int *value_ret)
 408 {
 409         validx += cval->idx_off;
 410
 411         return (cval->head.mixer->protocol == UAC_VERSION_1) ?
 412                 get_ctl_value_v1(cval, request, validx, value_ret) :
 413                 get_ctl_value_v2(cval, request, validx, value_ret);
 414 }
 415
 416 static int get_cur_ctl_value(struct usb_mixer_elem_info *cval,
 417                              int validx, int *value)
 418 {
 419         return get_ctl_value(cval, UAC_GET_CUR, validx, value);
 420 }
 421
 422 /* channel = 0: master, 1 = first channel */
 423 static inline int get_cur_mix_raw(struct usb_mixer_elem_info *cval,
 424                                   int channel, int *value)
 425 {
 426         return get_ctl_value(cval, UAC_GET_CUR,
 427                              (cval->control << 8) | channel,
 428                              value);
 429 }
 430
 431 int snd_usb_get_cur_mix_value(struct usb_mixer_elem_info *cval,
 432                              int channel, int index, int *value)
 433 {
 434         int err;
 435
 436         if (cval->cached & (1 << channel)) {
 437                 *value = cval->cache_val[index];
 438                 return 0;
 439         }
 440         err = get_cur_mix_raw(cval, channel, value);
 441         if (err < 0) {
 442                 if (!cval->head.mixer->ignore_ctl_error)
 443                         usb_audio_dbg(cval->head.mixer->chip,
 444                                 "cannot get current value for control %d ch %d: err = %d\n",
 445                                       cval->control, channel, err);
 446                 return err;
 447         }
 448         cval->cached |= 1 << channel;
 449         cval->cache_val[index] = *value;
 450         return 0;
 451 }
 452
 453 /*
 454  * set a mixer value
 455  */
 456
 457 int snd_usb_mixer_set_ctl_value(struct usb_mixer_elem_info *cval,
 458                                 int request, int validx, int value_set)
 459 {
 460         struct snd_usb_audio *chip = cval->head.mixer->chip;
 461         unsigned char buf[4];
 462         int idx = 0, val_len, err, timeout = 10;
 463
 464         validx += cval->idx_off;
 465
 466
 467         if (cval->head.mixer->protocol == UAC_VERSION_1) {
 468                 val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
 469         } else { /* UAC_VERSION_2/3 */
 470                 val_len = uac2_ctl_value_size(cval->val_type);
 471
 472                 /* FIXME */
 473                 if (request != UAC_SET_CUR) {
 474                         usb_audio_dbg(chip, "RANGE setting not yet supported\n");
 475                         return -EINVAL;
 476                 }
 477
 478                 request = UAC2_CS_CUR;
 479         }
 480
 481         value_set = convert_bytes_value(cval, value_set);
 482         buf[0] = value_set & 0xff;
 483         buf[1] = (value_set >> 8) & 0xff;
 484         buf[2] = (value_set >> 16) & 0xff;
 485         buf[3] = (value_set >> 24) & 0xff;
 486
 487         err = snd_usb_lock_shutdown(chip);
 488         if (err < 0)
 489                 return -EIO;
 490
 491         while (timeout-- > 0) {
 492                 idx = mixer_ctrl_intf(cval->head.mixer) | (cval->head.id << 8);
 493                 err = snd_usb_ctl_msg(chip->dev,
 494                                       usb_sndctrlpipe(chip->dev, 0), request,
 495                                       USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
 496                                       validx, idx, buf, val_len);
 497                 if (err >= 0) {
 498                         err = 0;
 499                         goto out;
 500                 } else if (err == -ETIMEDOUT) {
 501                         goto out;
 502                 }
 503         }
 504         usb_audio_dbg(chip, "cannot set ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d, data = %#x/%#x\n",
 505                       request, validx, idx, cval->val_type, buf[0], buf[1]);
 506         err = -EINVAL;
 507
 508  out:
 509         snd_usb_unlock_shutdown(chip);
 510         return err;
 511 }
 512
 513 static int set_cur_ctl_value(struct usb_mixer_elem_info *cval,
 514                              int validx, int value)
 515 {
 516         return snd_usb_mixer_set_ctl_value(cval, UAC_SET_CUR, validx, value);
 517 }
 518
 519 int snd_usb_set_cur_mix_value(struct usb_mixer_elem_info *cval, int channel,
 520                              int index, int value)
 521 {
 522         int err;
 523         unsigned int read_only = (channel == 0) ?
 524                 cval->master_readonly :
 525                 cval->ch_readonly & (1 << (channel - 1));
 526
 527         if (read_only) {
 528                 usb_audio_dbg(cval->head.mixer->chip,
 529                               "%s(): channel %d of control %d is read_only\n",
 530                             __func__, channel, cval->control);
 531                 return 0;
 532         }
 533
 534         err = snd_usb_mixer_set_ctl_value(cval,
 535                                           UAC_SET_CUR, (cval->control << 8) | channel,
 536                                           value);
 537         if (err < 0)
 538                 return err;
 539         cval->cached |= 1 << channel;
 540         cval->cache_val[index] = value;
 541         return 0;
 542 }
 543
 544 /*
 545  * TLV callback for mixer volume controls
 546  */
 547 int snd_usb_mixer_vol_tlv(struct snd_kcontrol *kcontrol, int op_flag,
 548                          unsigned int size, unsigned int __user *_tlv)
 549 {
 550         struct usb_mixer_elem_info *cval = kcontrol->private_data;
 551         DECLARE_TLV_DB_MINMAX(scale, 0, 0);
 552
 553         if (size < sizeof(scale))
 554                 return -ENOMEM;
 555         if (cval->min_mute)
 556                 scale[0] = SNDRV_CTL_TLVT_DB_MINMAX_MUTE;
 557         scale[2] = cval->dBmin;
 558         scale[3] = cval->dBmax;
 559         if (copy_to_user(_tlv, scale, sizeof(scale)))
 560                 return -EFAULT;
 561         return 0;
 562 }
 563
 564 /*
 565  * parser routines begin here...
 566  */
 567
 568 static int parse_audio_unit(struct mixer_build *state, int unitid);
 569
 570
 571 /*
 572  * check if the input/output channel routing is enabled on the given bitmap.
 573  * used for mixer unit parser
 574  */
 575 static int check_matrix_bitmap(unsigned char *bmap,
 576                                int ich, int och, int num_outs)
 577 {
 578         int idx = ich * num_outs + och;
 579         return bmap[idx >> 3] & (0x80 >> (idx & 7));
 580 }
 581
 582 /*
 583  * add an alsa control element
 584  * search and increment the index until an empty slot is found.
 585  *
 586  * if failed, give up and free the control instance.
 587  */
 588
 589 int snd_usb_mixer_add_list(struct usb_mixer_elem_list *list,
 590                            struct snd_kcontrol *kctl,
 591                            bool is_std_info)
 592 {
 593         struct usb_mixer_interface *mixer = list->mixer;
 594         int err;
 595
 596         while (snd_ctl_find_id(mixer->chip->card, &kctl->id))
 597                 kctl->id.index++;
 598         err = snd_ctl_add(mixer->chip->card, kctl);
 599         if (err < 0) {
 600                 usb_audio_dbg(mixer->chip, "cannot add control (err = %d)\n",
 601                               err);
 602                 return err;
 603         }
 604         list->kctl = kctl;
 605         list->is_std_info = is_std_info;
 606         list->next_id_elem = mixer->id_elems[list->id];
 607         mixer->id_elems[list->id] = list;
 608         return 0;
 609 }
 610
 611 /*
 612  * get a terminal name string
 613  */
 614
 615 static struct iterm_name_combo {
 616         int type;
 617         char *name;
 618 } iterm_names[] = {
 619         { 0x0300, "Output" },
 620         { 0x0301, "Speaker" },
 621         { 0x0302, "Headphone" },
 622         { 0x0303, "HMD Audio" },
 623         { 0x0304, "Desktop Speaker" },
 624         { 0x0305, "Room Speaker" },
 625         { 0x0306, "Com Speaker" },
 626         { 0x0307, "LFE" },
 627         { 0x0600, "External In" },
 628         { 0x0601, "Analog In" },
 629         { 0x0602, "Digital In" },
 630         { 0x0603, "Line" },
 631         { 0x0604, "Legacy In" },
 632         { 0x0605, "IEC958 In" },
 633         { 0x0606, "1394 DA Stream" },
 634         { 0x0607, "1394 DV Stream" },
 635         { 0x0700, "Embedded" },
 636         { 0x0701, "Noise Source" },
 637         { 0x0702, "Equalization Noise" },
 638         { 0x0703, "CD" },
 639         { 0x0704, "DAT" },
 640         { 0x0705, "DCC" },
 641         { 0x0706, "MiniDisk" },
 642         { 0x0707, "Analog Tape" },
 643         { 0x0708, "Phonograph" },
 644         { 0x0709, "VCR Audio" },
 645         { 0x070a, "Video Disk Audio" },
 646         { 0x070b, "DVD Audio" },
 647         { 0x070c, "TV Tuner Audio" },
 648         { 0x070d, "Satellite Rec Audio" },
 649         { 0x070e, "Cable Tuner Audio" },
 650         { 0x070f, "DSS Audio" },
 651         { 0x0710, "Radio Receiver" },
 652         { 0x0711, "Radio Transmitter" },
 653         { 0x0712, "Multi-Track Recorder" },
 654         { 0x0713, "Synthesizer" },
 655         { 0 },
 656 };
 657
 658 static int get_term_name(struct snd_usb_audio *chip, struct usb_audio_term *iterm,
 659                          unsigned char *name, int maxlen, int term_only)
 660 {
 661         struct iterm_name_combo *names;
 662         int len;
 663
 664         if (iterm->name) {
 665                 len = snd_usb_copy_string_desc(chip, iterm->name,
 666                                                 name, maxlen);
 667                 if (len)
 668                         return len;
 669         }
 670
 671         /* virtual type - not a real terminal */
 672         if (iterm->type >> 16) {
 673                 if (term_only)
 674                         return 0;
 675                 switch (iterm->type >> 16) {
 676                 case UAC3_SELECTOR_UNIT:
 677                         strcpy(name, "Selector");
 678                         return 8;
 679                 case UAC3_PROCESSING_UNIT:
 680                         strcpy(name, "Process Unit");
 681                         return 12;
 682                 case UAC3_EXTENSION_UNIT:
 683                         strcpy(name, "Ext Unit");
 684                         return 8;
 685                 case UAC3_MIXER_UNIT:
 686                         strcpy(name, "Mixer");
 687                         return 5;
 688                 default:
 689                         return sprintf(name, "Unit %d", iterm->id);
 690                 }
 691         }
 692
 693         switch (iterm->type & 0xff00) {
 694         case 0x0100:
 695                 strcpy(name, "PCM");
 696                 return 3;
 697         case 0x0200:
 698                 strcpy(name, "Mic");
 699                 return 3;
 700         case 0x0400:
 701                 strcpy(name, "Headset");
 702                 return 7;
 703         case 0x0500:
 704                 strcpy(name, "Phone");
 705                 return 5;
 706         }
 707
 708         for (names = iterm_names; names->type; names++) {
 709                 if (names->type == iterm->type) {
 710                         strcpy(name, names->name);
 711                         return strlen(names->name);
 712                 }
 713         }
 714
 715         return 0;
 716 }
 717
 718 /*
 719  * Get logical cluster information for UAC3 devices.
 720  */
 721 static int get_cluster_channels_v3(struct mixer_build *state, unsigned int cluster_id)
 722 {
 723         struct uac3_cluster_header_descriptor c_header;
 724         int err;
 725
 726         err = snd_usb_ctl_msg(state->chip->dev,
 727                         usb_rcvctrlpipe(state->chip->dev, 0),
 728                         UAC3_CS_REQ_HIGH_CAPABILITY_DESCRIPTOR,
 729                         USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
 730                         cluster_id,
 731                         snd_usb_ctrl_intf(state->chip),
 732                         &c_header, sizeof(c_header));
 733         if (err < 0)
 734                 goto error;
 735         if (err != sizeof(c_header)) {
 736                 err = -EIO;
 737                 goto error;
 738         }
 739
 740         return c_header.bNrChannels;
 741
 742 error:
 743         usb_audio_err(state->chip, "cannot request logical cluster ID: %d (err: %d)\n", cluster_id, err);
 744         return err;
 745 }
 746
 747 /*
 748  * Get number of channels for a Mixer Unit.
 749  */
 750 static int uac_mixer_unit_get_channels(struct mixer_build *state,
 751                                        struct uac_mixer_unit_descriptor *desc)
 752 {
 753         int mu_channels;
 754
 755         switch (state->mixer->protocol) {
 756         case UAC_VERSION_1:
 757         case UAC_VERSION_2:
 758         default:
 759                 if (desc->bLength < sizeof(*desc) + desc->bNrInPins + 1)
 760                         return 0; /* no bmControls -> skip */
 761                 mu_channels = uac_mixer_unit_bNrChannels(desc);
 762                 break;
 763         case UAC_VERSION_3:
 764                 mu_channels = get_cluster_channels_v3(state,
 765                                 uac3_mixer_unit_wClusterDescrID(desc));
 766                 break;
 767         }
 768
 769         return mu_channels;
 770 }
 771
 772 /*
 773  * Parse Input Terminal Unit
 774  */
 775 static int __check_input_term(struct mixer_build *state, int id,
 776                               struct usb_audio_term *term);
 777
 778 static int parse_term_uac1_iterm_unit(struct mixer_build *state,
 779                                       struct usb_audio_term *term,
 780                                       void *p1, int id)
 781 {
 782         struct uac_input_terminal_descriptor *d = p1;
 783
 784         term->type = le16_to_cpu(d->wTerminalType);
 785         term->channels = d->bNrChannels;
 786         term->chconfig = le16_to_cpu(d->wChannelConfig);
 787         term->name = d->iTerminal;
 788         return 0;
 789 }
 790
 791 static int parse_term_uac2_iterm_unit(struct mixer_build *state,
 792                                       struct usb_audio_term *term,
 793                                       void *p1, int id)
 794 {
 795         struct uac2_input_terminal_descriptor *d = p1;
 796         int err;
 797
 798         /* call recursively to verify the referenced clock entity */
 799         err = __check_input_term(state, d->bCSourceID, term);
 800         if (err < 0)
 801                 return err;
 802
 803         /* save input term properties after recursion,
 804          * to ensure they are not overriden by the recursion calls
 805          */
 806         term->id = id;
 807         term->type = le16_to_cpu(d->wTerminalType);
 808         term->channels = d->bNrChannels;
 809         term->chconfig = le32_to_cpu(d->bmChannelConfig);
 810         term->name = d->iTerminal;
 811         return 0;
 812 }
 813
 814 static int parse_term_uac3_iterm_unit(struct mixer_build *state,
 815                                       struct usb_audio_term *term,
 816                                       void *p1, int id)
 817 {
 818         struct uac3_input_terminal_descriptor *d = p1;
 819         int err;
 820
 821         /* call recursively to verify the referenced clock entity */
 822         err = __check_input_term(state, d->bCSourceID, term);
 823         if (err < 0)
 824                 return err;
 825
 826         /* save input term properties after recursion,
 827          * to ensure they are not overriden by the recursion calls
 828          */
 829         term->id = id;
 830         term->type = le16_to_cpu(d->wTerminalType);
 831
 832         err = get_cluster_channels_v3(state, le16_to_cpu(d->wClusterDescrID));
 833         if (err < 0)
 834                 return err;
 835         term->channels = err;
 836
 837         /* REVISIT: UAC3 IT doesn't have channels cfg */
 838         term->chconfig = 0;
 839
 840         term->name = le16_to_cpu(d->wTerminalDescrStr);
 841         return 0;
 842 }
 843
 844 static int parse_term_mixer_unit(struct mixer_build *state,
 845                                  struct usb_audio_term *term,
 846                                  void *p1, int id)
 847 {
 848         struct uac_mixer_unit_descriptor *d = p1;
 849         int protocol = state->mixer->protocol;
 850         int err;
 851
 852         err = uac_mixer_unit_get_channels(state, d);
 853         if (err <= 0)
 854                 return err;
 855
 856         term->type = UAC3_MIXER_UNIT << 16; /* virtual type */
 857         term->channels = err;
 858         if (protocol != UAC_VERSION_3) {
 859                 term->chconfig = uac_mixer_unit_wChannelConfig(d, protocol);
 860                 term->name = uac_mixer_unit_iMixer(d);
 861         }
 862         return 0;
 863 }
 864
 865 static int parse_term_selector_unit(struct mixer_build *state,
 866                                     struct usb_audio_term *term,
 867                                     void *p1, int id)
 868 {
 869         struct uac_selector_unit_descriptor *d = p1;
 870         int err;
 871
 872         /* call recursively to retrieve the channel info */
 873         err = __check_input_term(state, d->baSourceID[0], term);
 874         if (err < 0)
 875                 return err;
 876         term->type = UAC3_SELECTOR_UNIT << 16; /* virtual type */
 877         term->id = id;
 878         if (state->mixer->protocol != UAC_VERSION_3)
 879                 term->name = uac_selector_unit_iSelector(d);
 880         return 0;
 881 }
 882
 883 static int parse_term_proc_unit(struct mixer_build *state,
 884                                 struct usb_audio_term *term,
 885                                 void *p1, int id, int vtype)
 886 {
 887         struct uac_processing_unit_descriptor *d = p1;
 888         int protocol = state->mixer->protocol;
 889         int err;
 890
 891         if (d->bNrInPins) {
 892                 /* call recursively to retrieve the channel info */
 893                 err = __check_input_term(state, d->baSourceID[0], term);
 894                 if (err < 0)
 895                         return err;
 896         }
 897
 898         term->type = vtype << 16; /* virtual type */
 899         term->id = id;
 900
 901         if (protocol == UAC_VERSION_3)
 902                 return 0;
 903
 904         if (!term->channels) {
 905                 term->channels = uac_processing_unit_bNrChannels(d);
 906                 term->chconfig = uac_processing_unit_wChannelConfig(d, protocol);
 907         }
 908         term->name = uac_processing_unit_iProcessing(d, protocol);
 909         return 0;
 910 }
 911
 912 static int parse_term_effect_unit(struct mixer_build *state,
 913                                   struct usb_audio_term *term,
 914                                   void *p1, int id)
 915 {
 916         struct uac2_effect_unit_descriptor *d = p1;
 917         int err;
 918
 919         err = __check_input_term(state, d->bSourceID, term);
 920         if (err < 0)
 921                 return err;
 922         term->type = UAC3_EFFECT_UNIT << 16; /* virtual type */
 923         term->id = id;
 924         return 0;
 925 }
 926
 927 static int parse_term_uac2_clock_source(struct mixer_build *state,
 928                                         struct usb_audio_term *term,
 929                                         void *p1, int id)
 930 {
 931         struct uac_clock_source_descriptor *d = p1;
 932
 933         term->type = UAC3_CLOCK_SOURCE << 16; /* virtual type */
 934         term->id = id;
 935         term->name = d->iClockSource;
 936         return 0;
 937 }
 938
 939 static int parse_term_uac3_clock_source(struct mixer_build *state,
 940                                         struct usb_audio_term *term,
 941                                         void *p1, int id)
 942 {
 943         struct uac3_clock_source_descriptor *d = p1;
 944
 945         term->type = UAC3_CLOCK_SOURCE << 16; /* virtual type */
 946         term->id = id;
 947         term->name = le16_to_cpu(d->wClockSourceStr);
 948         return 0;
 949 }
 950
 951 #define PTYPE(a, b)     ((a) << 8 | (b))
 952
 953 /*
 954  * parse the source unit recursively until it reaches to a terminal
 955  * or a branched unit.
 956  */
 957 static int __check_input_term(struct mixer_build *state, int id,
 958                               struct usb_audio_term *term)
 959 {
 960         int protocol = state->mixer->protocol;
 961         void *p1;
 962         unsigned char *hdr;
 963
 964         for (;;) {
 965                 /* a loop in the terminal chain? */
 966                 if (test_and_set_bit(id, state->termbitmap))
 967                         return -EINVAL;
 968
 969                 p1 = find_audio_control_unit(state, id);
 970                 if (!p1)
 971                         break;
 972                 if (!snd_usb_validate_audio_desc(p1, protocol))
 973                         break; /* bad descriptor */
 974
 975                 hdr = p1;
 976                 term->id = id;
 977
 978                 switch (PTYPE(protocol, hdr[2])) {
 979                 case PTYPE(UAC_VERSION_1, UAC_FEATURE_UNIT):
 980                 case PTYPE(UAC_VERSION_2, UAC_FEATURE_UNIT):
 981                 case PTYPE(UAC_VERSION_3, UAC3_FEATURE_UNIT): {
 982                         /* the header is the same for all versions */
 983                         struct uac_feature_unit_descriptor *d = p1;
 984
 985                         id = d->bSourceID;
 986                         break; /* continue to parse */
 987                 }
 988                 case PTYPE(UAC_VERSION_1, UAC_INPUT_TERMINAL):
 989                         return parse_term_uac1_iterm_unit(state, term, p1, id);
 990                 case PTYPE(UAC_VERSION_2, UAC_INPUT_TERMINAL):
 991                         return parse_term_uac2_iterm_unit(state, term, p1, id);
 992                 case PTYPE(UAC_VERSION_3, UAC_INPUT_TERMINAL):
 993                         return parse_term_uac3_iterm_unit(state, term, p1, id);
 994                 case PTYPE(UAC_VERSION_1, UAC_MIXER_UNIT):
 995                 case PTYPE(UAC_VERSION_2, UAC_MIXER_UNIT):
 996                 case PTYPE(UAC_VERSION_3, UAC3_MIXER_UNIT):
 997                         return parse_term_mixer_unit(state, term, p1, id);
 998                 case PTYPE(UAC_VERSION_1, UAC_SELECTOR_UNIT):
 999                 case PTYPE(UAC_VERSION_2, UAC_SELECTOR_UNIT):
1000                 case PTYPE(UAC_VERSION_2, UAC2_CLOCK_SELECTOR):
1001                 case PTYPE(UAC_VERSION_3, UAC3_SELECTOR_UNIT):
1002                 case PTYPE(UAC_VERSION_3, UAC3_CLOCK_SELECTOR):
1003                         return parse_term_selector_unit(state, term, p1, id);
1004                 case PTYPE(UAC_VERSION_1, UAC1_PROCESSING_UNIT):
1005                 case PTYPE(UAC_VERSION_2, UAC2_PROCESSING_UNIT_V2):
1006                 case PTYPE(UAC_VERSION_3, UAC3_PROCESSING_UNIT):
1007                         return parse_term_proc_unit(state, term, p1, id,
1008                                                     UAC3_PROCESSING_UNIT);
1009                 case PTYPE(UAC_VERSION_2, UAC2_EFFECT_UNIT):
1010                 case PTYPE(UAC_VERSION_3, UAC3_EFFECT_UNIT):
1011                         return parse_term_effect_unit(state, term, p1, id);
1012                 case PTYPE(UAC_VERSION_1, UAC1_EXTENSION_UNIT):
1013                 case PTYPE(UAC_VERSION_2, UAC2_EXTENSION_UNIT_V2):
1014                 case PTYPE(UAC_VERSION_3, UAC3_EXTENSION_UNIT):
1015                         return parse_term_proc_unit(state, term, p1, id,
1016                                                     UAC3_EXTENSION_UNIT);
1017                 case PTYPE(UAC_VERSION_2, UAC2_CLOCK_SOURCE):
1018                         return parse_term_uac2_clock_source(state, term, p1, id);
1019                 case PTYPE(UAC_VERSION_3, UAC3_CLOCK_SOURCE):
1020                         return parse_term_uac3_clock_source(state, term, p1, id);
1021                 default:
1022                         return -ENODEV;
1023                 }
1024         }
1025         return -ENODEV;
1026 }
1027
1028
1029 static int check_input_term(struct mixer_build *state, int id,
1030                             struct usb_audio_term *term)
1031 {
1032         memset(term, 0, sizeof(*term));
1033         memset(state->termbitmap, 0, sizeof(state->termbitmap));
1034         return __check_input_term(state, id, term);
1035 }
1036
1037 /*
1038  * Feature Unit
1039  */
1040
1041 /* feature unit control information */
1042 struct usb_feature_control_info {
1043         int control;
1044         const char *name;
1045         int type;       /* data type for uac1 */
1046         int type_uac2;  /* data type for uac2 if different from uac1, else -1 */
1047 };
1048
1049 static const struct usb_feature_control_info audio_feature_info[] = {
1050         { UAC_FU_MUTE,                  "Mute",                 USB_MIXER_INV_BOOLEAN, -1 },
1051         { UAC_FU_VOLUME,                "Volume",               USB_MIXER_S16, -1 },
1052         { UAC_FU_BASS,                  "Tone Control - Bass",  USB_MIXER_S8, -1 },
1053         { UAC_FU_MID,                   "Tone Control - Mid",   USB_MIXER_S8, -1 },
1054         { UAC_FU_TREBLE,                "Tone Control - Treble", USB_MIXER_S8, -1 },
1055         { UAC_FU_GRAPHIC_EQUALIZER,     "Graphic Equalizer",    USB_MIXER_S8, -1 }, /* FIXME: not implemented yet */
1056         { UAC_FU_AUTOMATIC_GAIN,        "Auto Gain Control",    USB_MIXER_BOOLEAN, -1 },
1057         { UAC_FU_DELAY,                 "Delay Control",        USB_MIXER_U16, USB_MIXER_U32 },
1058         { UAC_FU_BASS_BOOST,            "Bass Boost",           USB_MIXER_BOOLEAN, -1 },
1059         { UAC_FU_LOUDNESS,              "Loudness",             USB_MIXER_BOOLEAN, -1 },
1060         /* UAC2 specific */
1061         { UAC2_FU_INPUT_GAIN,           "Input Gain Control",   USB_MIXER_S16, -1 },
1062         { UAC2_FU_INPUT_GAIN_PAD,       "Input Gain Pad Control", USB_MIXER_S16, -1 },
1063         { UAC2_FU_PHASE_INVERTER,        "Phase Inverter Control", USB_MIXER_BOOLEAN, -1 },
1064 };
1065
1066 static void usb_mixer_elem_info_free(struct usb_mixer_elem_info *cval)
1067 {
1068         kfree(cval);
1069 }
1070
1071 /* private_free callback */
1072 void snd_usb_mixer_elem_free(struct snd_kcontrol *kctl)
1073 {
1074         usb_mixer_elem_info_free(kctl->private_data);
1075         kctl->private_data = NULL;
1076 }
1077
1078 /*
1079  * interface to ALSA control for feature/mixer units
1080  */
1081
1082 /* volume control quirks */
1083 static void volume_control_quirks(struct usb_mixer_elem_info *cval,
1084                                   struct snd_kcontrol *kctl)
1085 {
1086         struct snd_usb_audio *chip = cval->head.mixer->chip;
1087         switch (chip->usb_id) {
1088         case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
1089         case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
1090                 if (strcmp(kctl->id.name, "Effect Duration") == 0) {
1091                         cval->min = 0x0000;
1092                         cval->max = 0xffff;
1093                         cval->res = 0x00e6;
1094                         break;
1095                 }
1096                 if (strcmp(kctl->id.name, "Effect Volume") == 0 ||
1097                     strcmp(kctl->id.name, "Effect Feedback Volume") == 0) {
1098                         cval->min = 0x00;
1099                         cval->max = 0xff;
1100                         break;
1101                 }
1102                 if (strstr(kctl->id.name, "Effect Return") != NULL) {
1103                         cval->min = 0xb706;
1104                         cval->max = 0xff7b;
1105                         cval->res = 0x0073;
1106                         break;
1107                 }
1108                 if ((strstr(kctl->id.name, "Playback Volume") != NULL) ||
1109                         (strstr(kctl->id.name, "Effect Send") != NULL)) {
1110                         cval->min = 0xb5fb; /* -73 dB = 0xb6ff */
1111                         cval->max = 0xfcfe;
1112                         cval->res = 0x0073;
1113                 }
1114                 break;
1115
1116         case USB_ID(0x0763, 0x2081): /* M-Audio Fast Track Ultra 8R */
1117         case USB_ID(0x0763, 0x2080): /* M-Audio Fast Track Ultra */
1118                 if (strcmp(kctl->id.name, "Effect Duration") == 0) {
1119                         usb_audio_info(chip,
1120                                        "set quirk for FTU Effect Duration\n");
1121                         cval->min = 0x0000;
1122                         cval->max = 0x7f00;
1123                         cval->res = 0x0100;
1124                         break;
1125                 }
1126                 if (strcmp(kctl->id.name, "Effect Volume") == 0 ||
1127                     strcmp(kctl->id.name, "Effect Feedback Volume") == 0) {
1128                         usb_audio_info(chip,
1129                                        "set quirks for FTU Effect Feedback/Volume\n");
1130                         cval->min = 0x00;
1131                         cval->max = 0x7f;
1132                         break;
1133                 }
1134                 break;
1135
1136         case USB_ID(0x0d8c, 0x0103):
1137                 if (!strcmp(kctl->id.name, "PCM Playback Volume")) {
1138                         usb_audio_info(chip,
1139                                  "set volume quirk for CM102-A+/102S+\n");
1140                         cval->min = -256;
1141                 }
1142                 break;
1143
1144         case USB_ID(0x0471, 0x0101):
1145         case USB_ID(0x0471, 0x0104):
1146         case USB_ID(0x0471, 0x0105):
1147         case USB_ID(0x0672, 0x1041):
1148         /* quirk for UDA1321/N101.
1149          * note that detection between firmware 2.1.1.7 (N101)
1150          * and later 2.1.1.21 is not very clear from datasheets.
1151          * I hope that the min value is -15360 for newer firmware --jk
1152          */
1153                 if (!strcmp(kctl->id.name, "PCM Playback Volume") &&
1154                     cval->min == -15616) {
1155                         usb_audio_info(chip,
1156                                  "set volume quirk for UDA1321/N101 chip\n");
1157                         cval->max = -256;
1158                 }
1159                 break;
1160
1161         case USB_ID(0x046d, 0x09a4):
1162                 if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
1163                         usb_audio_info(chip,
1164                                 "set volume quirk for QuickCam E3500\n");
1165                         cval->min = 6080;
1166                         cval->max = 8768;
1167                         cval->res = 192;
1168                 }
1169                 break;
1170
1171         case USB_ID(0x046d, 0x0807): /* Logitech Webcam C500 */
1172         case USB_ID(0x046d, 0x0808):
1173         case USB_ID(0x046d, 0x0809):
1174         case USB_ID(0x046d, 0x0819): /* Logitech Webcam C210 */
1175         case USB_ID(0x046d, 0x081b): /* HD Webcam c310 */
1176         case USB_ID(0x046d, 0x081d): /* HD Webcam c510 */
1177         case USB_ID(0x046d, 0x0825): /* HD Webcam c270 */
1178         case USB_ID(0x046d, 0x0826): /* HD Webcam c525 */
1179         case USB_ID(0x046d, 0x08ca): /* Logitech Quickcam Fusion */
1180         case USB_ID(0x046d, 0x0991):
1181         case USB_ID(0x046d, 0x09a2): /* QuickCam Communicate Deluxe/S7500 */
1182         /* Most audio usb devices lie about volume resolution.
1183          * Most Logitech webcams have res = 384.
1184          * Probably there is some logitech magic behind this number --fishor
1185          */
1186                 if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
1187                         usb_audio_info(chip,
1188                                 "set resolution quirk: cval->res = 384\n");
1189                         cval->res = 384;
1190                 }
1191                 break;
1192         case USB_ID(0x0495, 0x3042): /* ESS Technology Asus USB DAC */
1193                 if ((strstr(kctl->id.name, "Playback Volume") != NULL) ||
1194                         strstr(kctl->id.name, "Capture Volume") != NULL) {
1195                         cval->min >>= 8;
1196                         cval->max = 0;
1197                         cval->res = 1;
1198                 }
1199                 break;
1200         case USB_ID(0x1224, 0x2a25): /* Jieli Technology USB PHY 2.0 */
1201                 if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
1202                         usb_audio_info(chip,
1203                                 "set resolution quirk: cval->res = 16\n");
1204                         cval->res = 16;
1205                 }
1206                 break;
1207         }
1208 }
1209
1210 /* forcibly initialize the current mixer value; if GET_CUR fails, set to
1211  * the minimum as default
1212  */
1213 static void init_cur_mix_raw(struct usb_mixer_elem_info *cval, int ch, int idx)
1214 {
1215         int val, err;
1216
1217         err = snd_usb_get_cur_mix_value(cval, ch, idx, &val);
1218         if (!err)
1219                 return;
1220         if (!cval->head.mixer->ignore_ctl_error)
1221                 usb_audio_warn(cval->head.mixer->chip,
1222                                "%d:%d: failed to get current value for ch %d (%d)\n",
1223                                cval->head.id, mixer_ctrl_intf(cval->head.mixer),
1224                                ch, err);
1225         snd_usb_set_cur_mix_value(cval, ch, idx, cval->min);
1226 }
1227
1228 /*
1229  * retrieve the minimum and maximum values for the specified control
1230  */
1231 static int get_min_max_with_quirks(struct usb_mixer_elem_info *cval,
1232                                    int default_min, struct snd_kcontrol *kctl)
1233 {
1234         int i, idx;
1235
1236         /* for failsafe */
1237         cval->min = default_min;
1238         cval->max = cval->min + 1;
1239         cval->res = 1;
1240         cval->dBmin = cval->dBmax = 0;
1241
1242         if (cval->val_type == USB_MIXER_BOOLEAN ||
1243             cval->val_type == USB_MIXER_INV_BOOLEAN) {
1244                 cval->initialized = 1;
1245         } else {
1246                 int minchn = 0;
1247                 if (cval->cmask) {
1248                         for (i = 0; i < MAX_CHANNELS; i++)
1249                                 if (cval->cmask & (1 << i)) {
1250                                         minchn = i + 1;
1251                                         break;
1252                                 }
1253                 }
1254                 if (get_ctl_value(cval, UAC_GET_MAX, (cval->control << 8) | minchn, &cval->max) < 0 ||
1255                     get_ctl_value(cval, UAC_GET_MIN, (cval->control << 8) | minchn, &cval->min) < 0) {
1256                         usb_audio_err(cval->head.mixer->chip,
1257                                       "%d:%d: cannot get min/max values for control %d (id %d)\n",
1258                                    cval->head.id, mixer_ctrl_intf(cval->head.mixer),
1259                                                                cval->control, cval->head.id);
1260                         return -EINVAL;
1261                 }
1262                 if (get_ctl_value(cval, UAC_GET_RES,
1263                                   (cval->control << 8) | minchn,
1264                                   &cval->res) < 0) {
1265                         cval->res = 1;
1266                 } else if (cval->head.mixer->protocol == UAC_VERSION_1) {
1267                         int last_valid_res = cval->res;
1268
1269                         while (cval->res > 1) {
1270                                 if (snd_usb_mixer_set_ctl_value(cval, UAC_SET_RES,
1271                                                                 (cval->control << 8) | minchn,
1272                                                                 cval->res / 2) < 0)
1273                                         break;
1274                                 cval->res /= 2;
1275                         }
1276                         if (get_ctl_value(cval, UAC_GET_RES,
1277                                           (cval->control << 8) | minchn, &cval->res) < 0)
1278                                 cval->res = last_valid_res;
1279                 }
1280                 if (cval->res == 0)
1281                         cval->res = 1;
1282
1283                 /* Additional checks for the proper resolution
1284                  *
1285                  * Some devices report smaller resolutions than actually
1286                  * reacting.  They don't return errors but simply clip
1287                  * to the lower aligned value.
1288                  */
1289                 if (cval->min + cval->res < cval->max) {
1290                         int last_valid_res = cval->res;
1291                         int saved, test, check;
1292                         if (get_cur_mix_raw(cval, minchn, &saved) < 0)
1293                                 goto no_res_check;
1294                         for (;;) {
1295                                 test = saved;
1296                                 if (test < cval->max)
1297                                         test += cval->res;
1298                                 else
1299                                         test -= cval->res;
1300                                 if (test < cval->min || test > cval->max ||
1301                                     snd_usb_set_cur_mix_value(cval, minchn, 0, test) ||
1302                                     get_cur_mix_raw(cval, minchn, &check)) {
1303                                         cval->res = last_valid_res;
1304                                         break;
1305                                 }
1306                                 if (test == check)
1307                                         break;
1308                                 cval->res *= 2;
1309                         }
1310                         snd_usb_set_cur_mix_value(cval, minchn, 0, saved);
1311                 }
1312
1313 no_res_check:
1314                 cval->initialized = 1;
1315         }
1316
1317         if (kctl)
1318                 volume_control_quirks(cval, kctl);
1319
1320         /* USB descriptions contain the dB scale in 1/256 dB unit
1321          * while ALSA TLV contains in 1/100 dB unit
1322          */
1323         cval->dBmin = (convert_signed_value(cval, cval->min) * 100) / 256;
1324         cval->dBmax = (convert_signed_value(cval, cval->max) * 100) / 256;
1325         if (cval->dBmin > cval->dBmax) {
1326                 /* something is wrong; assume it's either from/to 0dB */
1327                 if (cval->dBmin < 0)
1328                         cval->dBmax = 0;
1329                 else if (cval->dBmin > 0)
1330                         cval->dBmin = 0;
1331                 if (cval->dBmin > cval->dBmax) {
1332                         /* totally crap, return an error */
1333                         return -EINVAL;
1334                 }
1335         } else {
1336                 /* if the max volume is too low, it's likely a bogus range;
1337                  * here we use -96dB as the threshold
1338                  */
1339                 if (cval->dBmax <= -9600) {
1340                         usb_audio_info(cval->head.mixer->chip,
1341                                        "%d:%d: bogus dB values (%d/%d), disabling dB reporting\n",
1342                                        cval->head.id, mixer_ctrl_intf(cval->head.mixer),
1343                                        cval->dBmin, cval->dBmax);
1344                         cval->dBmin = cval->dBmax = 0;
1345                 }
1346         }
1347
1348         /* initialize all elements */
1349         if (!cval->cmask) {
1350                 init_cur_mix_raw(cval, 0, 0);
1351         } else {
1352                 idx = 0;
1353                 for (i = 0; i < MAX_CHANNELS; i++) {
1354                         if (cval->cmask & (1 << i)) {
1355                                 init_cur_mix_raw(cval, i + 1, idx);
1356                                 idx++;
1357                         }
1358                 }
1359         }
1360
1361         return 0;
1362 }
1363
1364 #define get_min_max(cval, def)  get_min_max_with_quirks(cval, def, NULL)
1365
1366 /* get a feature/mixer unit info */
1367 static int mixer_ctl_feature_info(struct snd_kcontrol *kcontrol,
1368                                   struct snd_ctl_elem_info *uinfo)
1369 {
1370         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1371
1372         if (cval->val_type == USB_MIXER_BOOLEAN ||
1373             cval->val_type == USB_MIXER_INV_BOOLEAN)
1374                 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1375         else
1376                 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
1377         uinfo->count = cval->channels;
1378         if (cval->val_type == USB_MIXER_BOOLEAN ||
1379             cval->val_type == USB_MIXER_INV_BOOLEAN) {
1380                 uinfo->value.integer.min = 0;
1381                 uinfo->value.integer.max = 1;
1382         } else {
1383                 if (!cval->initialized) {
1384                         get_min_max_with_quirks(cval, 0, kcontrol);
1385                         if (cval->initialized && cval->dBmin >= cval->dBmax) {
1386                                 kcontrol->vd[0].access &=
1387                                         ~(SNDRV_CTL_ELEM_ACCESS_TLV_READ |
1388                                           SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK);
1389                                 snd_ctl_notify(cval->head.mixer->chip->card,
1390                                                SNDRV_CTL_EVENT_MASK_INFO,
1391                                                &kcontrol->id);
1392                         }
1393                 }
1394                 uinfo->value.integer.min = 0;
1395                 uinfo->value.integer.max =
1396                         DIV_ROUND_UP(cval->max - cval->min, cval->res);
1397         }
1398         return 0;
1399 }
1400
1401 /* get the current value from feature/mixer unit */
1402 static int mixer_ctl_feature_get(struct snd_kcontrol *kcontrol,
1403                                  struct snd_ctl_elem_value *ucontrol)
1404 {
1405         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1406         int c, cnt, val, err;
1407
1408         ucontrol->value.integer.value[0] = cval->min;
1409         if (cval->cmask) {
1410                 cnt = 0;
1411                 for (c = 0; c < MAX_CHANNELS; c++) {
1412                         if (!(cval->cmask & (1 << c)))
1413                                 continue;
1414                         err = snd_usb_get_cur_mix_value(cval, c + 1, cnt, &val);
1415                         if (err < 0)
1416                                 return filter_error(cval, err);
1417                         val = get_relative_value(cval, val);
1418                         ucontrol->value.integer.value[cnt] = val;
1419                         cnt++;
1420                 }
1421                 return 0;
1422         } else {
1423                 /* master channel */
1424                 err = snd_usb_get_cur_mix_value(cval, 0, 0, &val);
1425                 if (err < 0)
1426                         return filter_error(cval, err);
1427                 val = get_relative_value(cval, val);
1428                 ucontrol->value.integer.value[0] = val;
1429         }
1430         return 0;
1431 }
1432
1433 /* put the current value to feature/mixer unit */
1434 static int mixer_ctl_feature_put(struct snd_kcontrol *kcontrol,
1435                                  struct snd_ctl_elem_value *ucontrol)
1436 {
1437         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1438         int c, cnt, val, oval, err;
1439         int changed = 0;
1440
1441         if (cval->cmask) {
1442                 cnt = 0;
1443                 for (c = 0; c < MAX_CHANNELS; c++) {
1444                         if (!(cval->cmask & (1 << c)))
1445                                 continue;
1446                         err = snd_usb_get_cur_mix_value(cval, c + 1, cnt, &oval);
1447                         if (err < 0)
1448                                 return filter_error(cval, err);
1449                         val = ucontrol->value.integer.value[cnt];
1450                         val = get_abs_value(cval, val);
1451                         if (oval != val) {
1452                                 snd_usb_set_cur_mix_value(cval, c + 1, cnt, val);
1453                                 changed = 1;
1454                         }
1455                         cnt++;
1456                 }
1457         } else {
1458                 /* master channel */
1459                 err = snd_usb_get_cur_mix_value(cval, 0, 0, &oval);
1460                 if (err < 0)
1461                         return filter_error(cval, err);
1462                 val = ucontrol->value.integer.value[0];
1463                 val = get_abs_value(cval, val);
1464                 if (val != oval) {
1465                         snd_usb_set_cur_mix_value(cval, 0, 0, val);
1466                         changed = 1;
1467                 }
1468         }
1469         return changed;
1470 }
1471
1472 /* get the boolean value from the master channel of a UAC control */
1473 static int mixer_ctl_master_bool_get(struct snd_kcontrol *kcontrol,
1474                                      struct snd_ctl_elem_value *ucontrol)
1475 {
1476         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1477         int val, err;
1478
1479         err = snd_usb_get_cur_mix_value(cval, 0, 0, &val);
1480         if (err < 0)
1481                 return filter_error(cval, err);
1482         val = (val != 0);
1483         ucontrol->value.integer.value[0] = val;
1484         return 0;
1485 }
1486
1487 static int get_connector_value(struct usb_mixer_elem_info *cval,
1488                                char *name, int *val)
1489 {
1490         struct snd_usb_audio *chip = cval->head.mixer->chip;
1491         int idx = 0, validx, ret;
1492
1493         validx = cval->control << 8 | 0;
1494
1495         ret = snd_usb_lock_shutdown(chip) ? -EIO : 0;
1496         if (ret)
1497                 goto error;
1498
1499         idx = mixer_ctrl_intf(cval->head.mixer) | (cval->head.id << 8);
1500         if (cval->head.mixer->protocol == UAC_VERSION_2) {
1501                 struct uac2_connectors_ctl_blk uac2_conn;
1502
1503                 ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), UAC2_CS_CUR,
1504                                       USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
1505                                       validx, idx, &uac2_conn, sizeof(uac2_conn));
1506                 if (val)
1507                         *val = !!uac2_conn.bNrChannels;
1508         } else { /* UAC_VERSION_3 */
1509                 struct uac3_insertion_ctl_blk uac3_conn;
1510
1511                 ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), UAC2_CS_CUR,
1512                                       USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
1513                                       validx, idx, &uac3_conn, sizeof(uac3_conn));
1514                 if (val)
1515                         *val = !!uac3_conn.bmConInserted;
1516         }
1517
1518         snd_usb_unlock_shutdown(chip);
1519
1520         if (ret < 0) {
1521                 if (name && strstr(name, "Speaker")) {
1522                         if (val)
1523                                 *val = 1;
1524                         return 0;
1525                 }
1526 error:
1527                 usb_audio_err(chip,
1528                         "cannot get connectors status: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
1529                         UAC_GET_CUR, validx, idx, cval->val_type);
1530
1531                 if (val)
1532                         *val = 0;
1533
1534                 return filter_error(cval, ret);
1535         }
1536
1537         return ret;
1538 }
1539
1540 /* get the connectors status and report it as boolean type */
1541 static int mixer_ctl_connector_get(struct snd_kcontrol *kcontrol,
1542                                    struct snd_ctl_elem_value *ucontrol)
1543 {
1544         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1545         int ret, val;
1546
1547         ret = get_connector_value(cval, kcontrol->id.name, &val);
1548
1549         if (ret < 0)
1550                 return ret;
1551
1552         ucontrol->value.integer.value[0] = val;
1553         return 0;
1554 }
1555
1556 static const struct snd_kcontrol_new usb_feature_unit_ctl = {
1557         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1558         .name = "", /* will be filled later manually */
1559         .info = mixer_ctl_feature_info,
1560         .get = mixer_ctl_feature_get,
1561         .put = mixer_ctl_feature_put,
1562 };
1563
1564 /* the read-only variant */
1565 static const struct snd_kcontrol_new usb_feature_unit_ctl_ro = {
1566         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1567         .name = "", /* will be filled later manually */
1568         .info = mixer_ctl_feature_info,
1569         .get = mixer_ctl_feature_get,
1570         .put = NULL,
1571 };
1572
1573 /*
1574  * A control which shows the boolean value from reading a UAC control on
1575  * the master channel.
1576  */
1577 static const struct snd_kcontrol_new usb_bool_master_control_ctl_ro = {
1578         .iface = SNDRV_CTL_ELEM_IFACE_CARD,
1579         .name = "", /* will be filled later manually */
1580         .access = SNDRV_CTL_ELEM_ACCESS_READ,
1581         .info = snd_ctl_boolean_mono_info,
1582         .get = mixer_ctl_master_bool_get,
1583         .put = NULL,
1584 };
1585
1586 static const struct snd_kcontrol_new usb_connector_ctl_ro = {
1587         .iface = SNDRV_CTL_ELEM_IFACE_CARD,
1588         .name = "", /* will be filled later manually */
1589         .access = SNDRV_CTL_ELEM_ACCESS_READ,
1590         .info = snd_ctl_boolean_mono_info,
1591         .get = mixer_ctl_connector_get,
1592         .put = NULL,
1593 };
1594
1595 /*
1596  * This symbol is exported in order to allow the mixer quirks to
1597  * hook up to the standard feature unit control mechanism
1598  */
1599 const struct snd_kcontrol_new *snd_usb_feature_unit_ctl = &usb_feature_unit_ctl;
1600
1601 /*
1602  * build a feature control
1603  */
1604 static size_t append_ctl_name(struct snd_kcontrol *kctl, const char *str)
1605 {
1606         return strlcat(kctl->id.name, str, sizeof(kctl->id.name));
1607 }
1608
1609 /*
1610  * A lot of headsets/headphones have a "Speaker" mixer. Make sure we
1611  * rename it to "Headphone". We determine if something is a headphone
1612  * similar to how udev determines form factor.
1613  */
1614 static void check_no_speaker_on_headset(struct snd_kcontrol *kctl,
1615                                         struct snd_card *card)
1616 {
1617         static const char * const names_to_check[] = {
1618                 "Headset", "headset", "Headphone", "headphone", NULL};
1619         const char * const *s;
1620         bool found = false;
1621
1622         if (strcmp("Speaker", kctl->id.name))
1623                 return;
1624
1625         for (s = names_to_check; *s; s++)
1626                 if (strstr(card->shortname, *s)) {
1627                         found = true;
1628                         break;
1629                 }
1630
1631         if (!found)
1632                 return;
1633
1634         strscpy(kctl->id.name, "Headphone", sizeof(kctl->id.name));
1635 }
1636
1637 static const struct usb_feature_control_info *get_feature_control_info(int control)
1638 {
1639         int i;
1640
1641         for (i = 0; i < ARRAY_SIZE(audio_feature_info); ++i) {
1642                 if (audio_feature_info[i].control == control)
1643                         return &audio_feature_info[i];
1644         }
1645         return NULL;
1646 }
1647
1648 static void __build_feature_ctl(struct usb_mixer_interface *mixer,
1649                                 const struct usbmix_name_map *imap,
1650                                 unsigned int ctl_mask, int control,
1651                                 struct usb_audio_term *iterm,
1652                                 struct usb_audio_term *oterm,
1653                                 int unitid, int nameid, int readonly_mask)
1654 {
1655         const struct usb_feature_control_info *ctl_info;
1656         unsigned int len = 0;
1657         int mapped_name = 0;
1658         struct snd_kcontrol *kctl;
1659         struct usb_mixer_elem_info *cval;
1660         const struct usbmix_name_map *map;
1661         unsigned int range;
1662
1663         if (control == UAC_FU_GRAPHIC_EQUALIZER) {
1664                 /* FIXME: not supported yet */
1665                 return;
1666         }
1667
1668         map = find_map(imap, unitid, control);
1669         if (check_ignored_ctl(map))
1670                 return;
1671
1672         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1673         if (!cval)
1674                 return;
1675         snd_usb_mixer_elem_init_std(&cval->head, mixer, unitid);
1676         cval->control = control;
1677         cval->cmask = ctl_mask;
1678
1679         ctl_info = get_feature_control_info(control);
1680         if (!ctl_info) {
1681                 usb_mixer_elem_info_free(cval);
1682                 return;
1683         }
1684         if (mixer->protocol == UAC_VERSION_1)
1685                 cval->val_type = ctl_info->type;
1686         else /* UAC_VERSION_2 */
1687                 cval->val_type = ctl_info->type_uac2 >= 0 ?
1688                         ctl_info->type_uac2 : ctl_info->type;
1689
1690         if (ctl_mask == 0) {
1691                 cval->channels = 1;     /* master channel */
1692                 cval->master_readonly = readonly_mask;
1693         } else {
1694                 int i, c = 0;
1695                 for (i = 0; i < 16; i++)
1696                         if (ctl_mask & (1 << i))
1697                                 c++;
1698                 cval->channels = c;
1699                 cval->ch_readonly = readonly_mask;
1700         }
1701
1702         /*
1703          * If all channels in the mask are marked read-only, make the control
1704          * read-only. snd_usb_set_cur_mix_value() will check the mask again and won't
1705          * issue write commands to read-only channels.
1706          */
1707         if (cval->channels == readonly_mask)
1708                 kctl = snd_ctl_new1(&usb_feature_unit_ctl_ro, cval);
1709         else
1710                 kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
1711
1712         if (!kctl) {
1713                 usb_audio_err(mixer->chip, "cannot malloc kcontrol\n");
1714                 usb_mixer_elem_info_free(cval);
1715                 return;
1716         }
1717         kctl->private_free = snd_usb_mixer_elem_free;
1718
1719         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
1720         mapped_name = len != 0;
1721         if (!len && nameid)
1722                 len = snd_usb_copy_string_desc(mixer->chip, nameid,
1723                                 kctl->id.name, sizeof(kctl->id.name));
1724
1725         switch (control) {
1726         case UAC_FU_MUTE:
1727         case UAC_FU_VOLUME:
1728                 /*
1729                  * determine the control name.  the rule is:
1730                  * - if a name id is given in descriptor, use it.
1731                  * - if the connected input can be determined, then use the name
1732                  *   of terminal type.
1733                  * - if the connected output can be determined, use it.
1734                  * - otherwise, anonymous name.
1735                  */
1736                 if (!len) {
1737                         if (iterm)
1738                                 len = get_term_name(mixer->chip, iterm,
1739                                                     kctl->id.name,
1740                                                     sizeof(kctl->id.name), 1);
1741                         if (!len && oterm)
1742                                 len = get_term_name(mixer->chip, oterm,
1743                                                     kctl->id.name,
1744                                                     sizeof(kctl->id.name), 1);
1745                         if (!len)
1746                                 snprintf(kctl->id.name, sizeof(kctl->id.name),
1747                                          "Feature %d", unitid);
1748                 }
1749
1750                 if (!mapped_name)
1751                         check_no_speaker_on_headset(kctl, mixer->chip->card);
1752
1753                 /*
1754                  * determine the stream direction:
1755                  * if the connected output is USB stream, then it's likely a
1756                  * capture stream.  otherwise it should be playback (hopefully :)
1757                  */
1758                 if (!mapped_name && oterm && !(oterm->type >> 16)) {
1759                         if ((oterm->type & 0xff00) == 0x0100)
1760                                 append_ctl_name(kctl, " Capture");
1761                         else
1762                                 append_ctl_name(kctl, " Playback");
1763                 }
1764                 append_ctl_name(kctl, control == UAC_FU_MUTE ?
1765                                 " Switch" : " Volume");
1766                 break;
1767         default:
1768                 if (!len)
1769                         strscpy(kctl->id.name, audio_feature_info[control-1].name,
1770                                 sizeof(kctl->id.name));
1771                 break;
1772         }
1773
1774         /* get min/max values */
1775         get_min_max_with_quirks(cval, 0, kctl);
1776
1777         /* skip a bogus volume range */
1778         if (cval->max <= cval->min) {
1779                 usb_audio_dbg(mixer->chip,
1780                               "[%d] FU [%s] skipped due to invalid volume\n",
1781                               cval->head.id, kctl->id.name);
1782                 snd_ctl_free_one(kctl);
1783                 return;
1784         }
1785
1786
1787         if (control == UAC_FU_VOLUME) {
1788                 check_mapped_dB(map, cval);
1789                 if (cval->dBmin < cval->dBmax || !cval->initialized) {
1790                         kctl->tlv.c = snd_usb_mixer_vol_tlv;
1791                         kctl->vd[0].access |=
1792                                 SNDRV_CTL_ELEM_ACCESS_TLV_READ |
1793                                 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
1794                 }
1795         }
1796
1797         snd_usb_mixer_fu_apply_quirk(mixer, cval, unitid, kctl);
1798
1799         range = (cval->max - cval->min) / cval->res;
1800         /*
1801          * Are there devices with volume range more than 255? I use a bit more
1802          * to be sure. 384 is a resolution magic number found on Logitech
1803          * devices. It will definitively catch all buggy Logitech devices.
1804          */
1805         if (range > 384) {
1806                 usb_audio_warn(mixer->chip,
1807                                "Warning! Unlikely big volume range (=%u), cval->res is probably wrong.",
1808                                range);
1809                 usb_audio_warn(mixer->chip,
1810                                "[%d] FU [%s] ch = %d, val = %d/%d/%d",
1811                                cval->head.id, kctl->id.name, cval->channels,
1812                                cval->min, cval->max, cval->res);
1813         }
1814
1815         usb_audio_dbg(mixer->chip, "[%d] FU [%s] ch = %d, val = %d/%d/%d\n",
1816                       cval->head.id, kctl->id.name, cval->channels,
1817                       cval->min, cval->max, cval->res);
1818         snd_usb_mixer_add_control(&cval->head, kctl);
1819 }
1820
1821 static void build_feature_ctl(struct mixer_build *state, void *raw_desc,
1822                               unsigned int ctl_mask, int control,
1823                               struct usb_audio_term *iterm, int unitid,
1824                               int readonly_mask)
1825 {
1826         struct uac_feature_unit_descriptor *desc = raw_desc;
1827         int nameid = uac_feature_unit_iFeature(desc);
1828
1829         __build_feature_ctl(state->mixer, state->map, ctl_mask, control,
1830                         iterm, &state->oterm, unitid, nameid, readonly_mask);
1831 }
1832
1833 static void build_feature_ctl_badd(struct usb_mixer_interface *mixer,
1834                               unsigned int ctl_mask, int control, int unitid,
1835                               const struct usbmix_name_map *badd_map)
1836 {
1837         __build_feature_ctl(mixer, badd_map, ctl_mask, control,
1838                         NULL, NULL, unitid, 0, 0);
1839 }
1840
1841 static void get_connector_control_name(struct usb_mixer_interface *mixer,
1842                                        struct usb_audio_term *term,
1843                                        bool is_input, char *name, int name_size)
1844 {
1845         int name_len = get_term_name(mixer->chip, term, name, name_size, 0);
1846
1847         if (name_len == 0)
1848                 strscpy(name, "Unknown", name_size);
1849
1850         /*
1851          *  sound/core/ctljack.c has a convention of naming jack controls
1852          * by ending in " Jack".  Make it slightly more useful by
1853          * indicating Input or Output after the terminal name.
1854          */
1855         if (is_input)
1856                 strlcat(name, " - Input Jack", name_size);
1857         else
1858                 strlcat(name, " - Output Jack", name_size);
1859 }
1860
1861 /* get connector value to "wake up" the USB audio */
1862 static int connector_mixer_resume(struct usb_mixer_elem_list *list)
1863 {
1864         struct usb_mixer_elem_info *cval = mixer_elem_list_to_info(list);
1865
1866         get_connector_value(cval, NULL, NULL);
1867         return 0;
1868 }
1869
1870 /* Build a mixer control for a UAC connector control (jack-detect) */
1871 static void build_connector_control(struct usb_mixer_interface *mixer,
1872                                     const struct usbmix_name_map *imap,
1873                                     struct usb_audio_term *term, bool is_input)
1874 {
1875         struct snd_kcontrol *kctl;
1876         struct usb_mixer_elem_info *cval;
1877         const struct usbmix_name_map *map;
1878
1879         map = find_map(imap, term->id, 0);
1880         if (check_ignored_ctl(map))
1881                 return;
1882
1883         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1884         if (!cval)
1885                 return;
1886         snd_usb_mixer_elem_init_std(&cval->head, mixer, term->id);
1887
1888         /* set up a specific resume callback */
1889         cval->head.resume = connector_mixer_resume;
1890
1891         /*
1892          * UAC2: The first byte from reading the UAC2_TE_CONNECTOR control returns the
1893          * number of channels connected.
1894          *
1895          * UAC3: The first byte specifies size of bitmap for the inserted controls. The
1896          * following byte(s) specifies which connectors are inserted.
1897          *
1898          * This boolean ctl will simply report if any channels are connected
1899          * or not.
1900          */
1901         if (mixer->protocol == UAC_VERSION_2)
1902                 cval->control = UAC2_TE_CONNECTOR;
1903         else /* UAC_VERSION_3 */
1904                 cval->control = UAC3_TE_INSERTION;
1905
1906         cval->val_type = USB_MIXER_BOOLEAN;
1907         cval->channels = 1; /* report true if any channel is connected */
1908         cval->min = 0;
1909         cval->max = 1;
1910         kctl = snd_ctl_new1(&usb_connector_ctl_ro, cval);
1911         if (!kctl) {
1912                 usb_audio_err(mixer->chip, "cannot malloc kcontrol\n");
1913                 usb_mixer_elem_info_free(cval);
1914                 return;
1915         }
1916
1917         if (check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name)))
1918                 strlcat(kctl->id.name, " Jack", sizeof(kctl->id.name));
1919         else
1920                 get_connector_control_name(mixer, term, is_input, kctl->id.name,
1921                                            sizeof(kctl->id.name));
1922         kctl->private_free = snd_usb_mixer_elem_free;
1923         snd_usb_mixer_add_control(&cval->head, kctl);
1924 }
1925
1926 static int parse_clock_source_unit(struct mixer_build *state, int unitid,
1927                                    void *_ftr)
1928 {
1929         struct uac_clock_source_descriptor *hdr = _ftr;
1930         struct usb_mixer_elem_info *cval;
1931         struct snd_kcontrol *kctl;
1932         char name[SNDRV_CTL_ELEM_ID_NAME_MAXLEN];
1933         int ret;
1934
1935         if (state->mixer->protocol != UAC_VERSION_2)
1936                 return -EINVAL;
1937
1938         /*
1939          * The only property of this unit we are interested in is the
1940          * clock source validity. If that isn't readable, just bail out.
1941          */
1942         if (!uac_v2v3_control_is_readable(hdr->bmControls,
1943                                       UAC2_CS_CONTROL_CLOCK_VALID))
1944                 return 0;
1945
1946         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1947         if (!cval)
1948                 return -ENOMEM;
1949
1950         snd_usb_mixer_elem_init_std(&cval->head, state->mixer, hdr->bClockID);
1951
1952         cval->min = 0;
1953         cval->max = 1;
1954         cval->channels = 1;
1955         cval->val_type = USB_MIXER_BOOLEAN;
1956         cval->control = UAC2_CS_CONTROL_CLOCK_VALID;
1957
1958         cval->master_readonly = 1;
1959         /* From UAC2 5.2.5.1.2 "Only the get request is supported." */
1960         kctl = snd_ctl_new1(&usb_bool_master_control_ctl_ro, cval);
1961
1962         if (!kctl) {
1963                 usb_mixer_elem_info_free(cval);
1964                 return -ENOMEM;
1965         }
1966
1967         kctl->private_free = snd_usb_mixer_elem_free;
1968         ret = snd_usb_copy_string_desc(state->chip, hdr->iClockSource,
1969                                        name, sizeof(name));
1970         if (ret > 0)
1971                 snprintf(kctl->id.name, sizeof(kctl->id.name),
1972                          "%s Validity", name);
1973         else
1974                 snprintf(kctl->id.name, sizeof(kctl->id.name),
1975                          "Clock Source %d Validity", hdr->bClockID);
1976
1977         return snd_usb_mixer_add_control(&cval->head, kctl);
1978 }
1979
1980 /*
1981  * parse a feature unit
1982  *
1983  * most of controls are defined here.
1984  */
1985 static int parse_audio_feature_unit(struct mixer_build *state, int unitid,
1986                                     void *_ftr)
1987 {
1988         int channels, i, j;
1989         struct usb_audio_term iterm;
1990         unsigned int master_bits;
1991         int err, csize;
1992         struct uac_feature_unit_descriptor *hdr = _ftr;
1993         __u8 *bmaControls;
1994
1995         if (state->mixer->protocol == UAC_VERSION_1) {
1996                 csize = hdr->bControlSize;
1997                 channels = (hdr->bLength - 7) / csize - 1;
1998                 bmaControls = hdr->bmaControls;
1999         } else if (state->mixer->protocol == UAC_VERSION_2) {
2000                 struct uac2_feature_unit_descriptor *ftr = _ftr;
2001                 csize = 4;
2002                 channels = (hdr->bLength - 6) / 4 - 1;
2003                 bmaControls = ftr->bmaControls;
2004         } else { /* UAC_VERSION_3 */
2005                 struct uac3_feature_unit_descriptor *ftr = _ftr;
2006
2007                 csize = 4;
2008                 channels = (ftr->bLength - 7) / 4 - 1;
2009                 bmaControls = ftr->bmaControls;
2010         }
2011
2012         /* parse the source unit */
2013         err = parse_audio_unit(state, hdr->bSourceID);
2014         if (err < 0)
2015                 return err;
2016
2017         /* determine the input source type and name */
2018         err = check_input_term(state, hdr->bSourceID, &iterm);
2019         if (err < 0)
2020                 return err;
2021
2022         master_bits = snd_usb_combine_bytes(bmaControls, csize);
2023         /* master configuration quirks */
2024         switch (state->chip->usb_id) {
2025         case USB_ID(0x08bb, 0x2702):
2026                 usb_audio_info(state->chip,
2027                                "usbmixer: master volume quirk for PCM2702 chip\n");
2028                 /* disable non-functional volume control */
2029                 master_bits &= ~UAC_CONTROL_BIT(UAC_FU_VOLUME);
2030                 break;
2031         case USB_ID(0x1130, 0xf211):
2032                 usb_audio_info(state->chip,
2033                                "usbmixer: volume control quirk for Tenx TP6911 Audio Headset\n");
2034                 /* disable non-functional volume control */
2035                 channels = 0;
2036                 break;
2037
2038         }
2039
2040         if (state->mixer->protocol == UAC_VERSION_1) {
2041                 /* check all control types */
2042                 for (i = 0; i < 10; i++) {
2043                         unsigned int ch_bits = 0;
2044                         int control = audio_feature_info[i].control;
2045
2046                         for (j = 0; j < channels; j++) {
2047                                 unsigned int mask;
2048
2049                                 mask = snd_usb_combine_bytes(bmaControls +
2050                                                              csize * (j+1), csize);
2051                                 if (mask & (1 << i))
2052                                         ch_bits |= (1 << j);
2053                         }
2054                         /* audio class v1 controls are never read-only */
2055
2056                         /*
2057                          * The first channel must be set
2058                          * (for ease of programming).
2059                          */
2060                         if (ch_bits & 1)
2061                                 build_feature_ctl(state, _ftr, ch_bits, control,
2062                                                   &iterm, unitid, 0);
2063                         if (master_bits & (1 << i))
2064                                 build_feature_ctl(state, _ftr, 0, control,
2065                                                   &iterm, unitid, 0);
2066                 }
2067         } else { /* UAC_VERSION_2/3 */
2068                 for (i = 0; i < ARRAY_SIZE(audio_feature_info); i++) {
2069                         unsigned int ch_bits = 0;
2070                         unsigned int ch_read_only = 0;
2071                         int control = audio_feature_info[i].control;
2072
2073                         for (j = 0; j < channels; j++) {
2074                                 unsigned int mask;
2075
2076                                 mask = snd_usb_combine_bytes(bmaControls +
2077                                                              csize * (j+1), csize);
2078                                 if (uac_v2v3_control_is_readable(mask, control)) {
2079                                         ch_bits |= (1 << j);
2080                                         if (!uac_v2v3_control_is_writeable(mask, control))
2081                                                 ch_read_only |= (1 << j);
2082                                 }
2083                         }
2084
2085                         /*
2086                          * NOTE: build_feature_ctl() will mark the control
2087                          * read-only if all channels are marked read-only in
2088                          * the descriptors. Otherwise, the control will be
2089                          * reported as writeable, but the driver will not
2090                          * actually issue a write command for read-only
2091                          * channels.
2092                          */
2093
2094                         /*
2095                          * The first channel must be set
2096                          * (for ease of programming).
2097                          */
2098                         if (ch_bits & 1)
2099                                 build_feature_ctl(state, _ftr, ch_bits, control,
2100                                                   &iterm, unitid, ch_read_only);
2101                         if (uac_v2v3_control_is_readable(master_bits, control))
2102                                 build_feature_ctl(state, _ftr, 0, control,
2103                                                   &iterm, unitid,
2104                                                   !uac_v2v3_control_is_writeable(master_bits,
2105                                                                                  control));
2106                 }
2107         }
2108
2109         return 0;
2110 }
2111
2112 /*
2113  * Mixer Unit
2114  */
2115
2116 /* check whether the given in/out overflows bmMixerControls matrix */
2117 static bool mixer_bitmap_overflow(struct uac_mixer_unit_descriptor *desc,
2118                                   int protocol, int num_ins, int num_outs)
2119 {
2120         u8 *hdr = (u8 *)desc;
2121         u8 *c = uac_mixer_unit_bmControls(desc, protocol);
2122         size_t rest; /* remaining bytes after bmMixerControls */
2123
2124         switch (protocol) {
2125         case UAC_VERSION_1:
2126         default:
2127                 rest = 1; /* iMixer */
2128                 break;
2129         case UAC_VERSION_2:
2130                 rest = 2; /* bmControls + iMixer */
2131                 break;
2132         case UAC_VERSION_3:
2133                 rest = 6; /* bmControls + wMixerDescrStr */
2134                 break;
2135         }
2136
2137         /* overflow? */
2138         return c + (num_ins * num_outs + 7) / 8 + rest > hdr + hdr[0];
2139 }
2140
2141 /*
2142  * build a mixer unit control
2143  *
2144  * the callbacks are identical with feature unit.
2145  * input channel number (zero based) is given in control field instead.
2146  */
2147 static void build_mixer_unit_ctl(struct mixer_build *state,
2148                                  struct uac_mixer_unit_descriptor *desc,
2149                                  int in_pin, int in_ch, int num_outs,
2150                                  int unitid, struct usb_audio_term *iterm)
2151 {
2152         struct usb_mixer_elem_info *cval;
2153         unsigned int i, len;
2154         struct snd_kcontrol *kctl;
2155         const struct usbmix_name_map *map;
2156
2157         map = find_map(state->map, unitid, 0);
2158         if (check_ignored_ctl(map))
2159                 return;
2160
2161         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
2162         if (!cval)
2163                 return;
2164
2165         snd_usb_mixer_elem_init_std(&cval->head, state->mixer, unitid);
2166         cval->control = in_ch + 1; /* based on 1 */
2167         cval->val_type = USB_MIXER_S16;
2168         for (i = 0; i < num_outs; i++) {
2169                 __u8 *c = uac_mixer_unit_bmControls(desc, state->mixer->protocol);
2170
2171                 if (check_matrix_bitmap(c, in_ch, i, num_outs)) {
2172                         cval->cmask |= (1 << i);
2173                         cval->channels++;
2174                 }
2175         }
2176
2177         /* get min/max values */
2178         get_min_max(cval, 0);
2179
2180         kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
2181         if (!kctl) {
2182                 usb_audio_err(state->chip, "cannot malloc kcontrol\n");
2183                 usb_mixer_elem_info_free(cval);
2184                 return;
2185         }
2186         kctl->private_free = snd_usb_mixer_elem_free;
2187
2188         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
2189         if (!len)
2190                 len = get_term_name(state->chip, iterm, kctl->id.name,
2191                                     sizeof(kctl->id.name), 0);
2192         if (!len)
2193                 len = sprintf(kctl->id.name, "Mixer Source %d", in_ch + 1);
2194         append_ctl_name(kctl, " Volume");
2195
2196         usb_audio_dbg(state->chip, "[%d] MU [%s] ch = %d, val = %d/%d\n",
2197                     cval->head.id, kctl->id.name, cval->channels, cval->min, cval->max);
2198         snd_usb_mixer_add_control(&cval->head, kctl);
2199 }
2200
2201 static int parse_audio_input_terminal(struct mixer_build *state, int unitid,
2202                                       void *raw_desc)
2203 {
2204         struct usb_audio_term iterm;
2205         unsigned int control, bmctls, term_id;
2206
2207         if (state->mixer->protocol == UAC_VERSION_2) {
2208                 struct uac2_input_terminal_descriptor *d_v2 = raw_desc;
2209                 control = UAC2_TE_CONNECTOR;
2210                 term_id = d_v2->bTerminalID;
2211                 bmctls = le16_to_cpu(d_v2->bmControls);
2212         } else if (state->mixer->protocol == UAC_VERSION_3) {
2213                 struct uac3_input_terminal_descriptor *d_v3 = raw_desc;
2214                 control = UAC3_TE_INSERTION;
2215                 term_id = d_v3->bTerminalID;
2216                 bmctls = le32_to_cpu(d_v3->bmControls);
2217         } else {
2218                 return 0; /* UAC1. No Insertion control */
2219         }
2220
2221         check_input_term(state, term_id, &iterm);
2222
2223         /* Check for jack detection. */
2224         if ((iterm.type & 0xff00) != 0x0100 &&
2225             uac_v2v3_control_is_readable(bmctls, control))
2226                 build_connector_control(state->mixer, state->map, &iterm, true);
2227
2228         return 0;
2229 }
2230
2231 /*
2232  * parse a mixer unit
2233  */
2234 static int parse_audio_mixer_unit(struct mixer_build *state, int unitid,
2235                                   void *raw_desc)
2236 {
2237         struct uac_mixer_unit_descriptor *desc = raw_desc;
2238         struct usb_audio_term iterm;
2239         int input_pins, num_ins, num_outs;
2240         int pin, ich, err;
2241
2242         err = uac_mixer_unit_get_channels(state, desc);
2243         if (err < 0) {
2244                 usb_audio_err(state->chip,
2245                               "invalid MIXER UNIT descriptor %d\n",
2246                               unitid);
2247                 return err;
2248         }
2249
2250         num_outs = err;
2251         input_pins = desc->bNrInPins;
2252
2253         num_ins = 0;
2254         ich = 0;
2255         for (pin = 0; pin < input_pins; pin++) {
2256                 err = parse_audio_unit(state, desc->baSourceID[pin]);
2257                 if (err < 0)
2258                         continue;
2259                 /* no bmControls field (e.g. Maya44) -> ignore */
2260                 if (!num_outs)
2261                         continue;
2262                 err = check_input_term(state, desc->baSourceID[pin], &iterm);
2263                 if (err < 0)
2264                         return err;
2265                 num_ins += iterm.channels;
2266                 if (mixer_bitmap_overflow(desc, state->mixer->protocol,
2267                                           num_ins, num_outs))
2268                         break;
2269                 for (; ich < num_ins; ich++) {
2270                         int och, ich_has_controls = 0;
2271
2272                         for (och = 0; och < num_outs; och++) {
2273                                 __u8 *c = uac_mixer_unit_bmControls(desc,
2274                                                 state->mixer->protocol);
2275
2276                                 if (check_matrix_bitmap(c, ich, och, num_outs)) {
2277                                         ich_has_controls = 1;
2278                                         break;
2279                                 }
2280                         }
2281                         if (ich_has_controls)
2282                                 build_mixer_unit_ctl(state, desc, pin, ich, num_outs,
2283                                                      unitid, &iterm);
2284                 }
2285         }
2286         return 0;
2287 }
2288
2289 /*
2290  * Processing Unit / Extension Unit
2291  */
2292
2293 /* get callback for processing/extension unit */
2294 static int mixer_ctl_procunit_get(struct snd_kcontrol *kcontrol,
2295                                   struct snd_ctl_elem_value *ucontrol)
2296 {
2297         struct usb_mixer_elem_info *cval = kcontrol->private_data;
2298         int err, val;
2299
2300         err = get_cur_ctl_value(cval, cval->control << 8, &val);
2301         if (err < 0) {
2302                 ucontrol->value.integer.value[0] = cval->min;
2303                 return filter_error(cval, err);
2304         }
2305         val = get_relative_value(cval, val);
2306         ucontrol->value.integer.value[0] = val;
2307         return 0;
2308 }
2309
2310 /* put callback for processing/extension unit */
2311 static int mixer_ctl_procunit_put(struct snd_kcontrol *kcontrol,
2312                                   struct snd_ctl_elem_value *ucontrol)
2313 {
2314         struct usb_mixer_elem_info *cval = kcontrol->private_data;
2315         int val, oval, err;
2316
2317         err = get_cur_ctl_value(cval, cval->control << 8, &oval);
2318         if (err < 0)
2319                 return filter_error(cval, err);
2320         val = ucontrol->value.integer.value[0];
2321         val = get_abs_value(cval, val);
2322         if (val != oval) {
2323                 set_cur_ctl_value(cval, cval->control << 8, val);
2324                 return 1;
2325         }
2326         return 0;
2327 }
2328
2329 /* alsa control interface for processing/extension unit */
2330 static const struct snd_kcontrol_new mixer_procunit_ctl = {
2331         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
2332         .name = "", /* will be filled later */
2333         .info = mixer_ctl_feature_info,
2334         .get = mixer_ctl_procunit_get,
2335         .put = mixer_ctl_procunit_put,
2336 };
2337
2338 /*
2339  * predefined data for processing units
2340  */
2341 struct procunit_value_info {
2342         int control;
2343         const char *suffix;
2344         int val_type;
2345         int min_value;
2346 };
2347
2348 struct procunit_info {
2349         int type;
2350         char *name;
2351         const struct procunit_value_info *values;
2352 };
2353
2354 static const struct procunit_value_info undefined_proc_info[] = {
2355         { 0x00, "Control Undefined", 0 },
2356         { 0 }
2357 };
2358
2359 static const struct procunit_value_info updown_proc_info[] = {
2360         { UAC_UD_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2361         { UAC_UD_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
2362         { 0 }
2363 };
2364 static const struct procunit_value_info prologic_proc_info[] = {
2365         { UAC_DP_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2366         { UAC_DP_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
2367         { 0 }
2368 };
2369 static const struct procunit_value_info threed_enh_proc_info[] = {
2370         { UAC_3D_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2371         { UAC_3D_SPACE, "Spaciousness", USB_MIXER_U8 },
2372         { 0 }
2373 };
2374 static const struct procunit_value_info reverb_proc_info[] = {
2375         { UAC_REVERB_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2376         { UAC_REVERB_LEVEL, "Level", USB_MIXER_U8 },
2377         { UAC_REVERB_TIME, "Time", USB_MIXER_U16 },
2378         { UAC_REVERB_FEEDBACK, "Feedback", USB_MIXER_U8 },
2379         { 0 }
2380 };
2381 static const struct procunit_value_info chorus_proc_info[] = {
2382         { UAC_CHORUS_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2383         { UAC_CHORUS_LEVEL, "Level", USB_MIXER_U8 },
2384         { UAC_CHORUS_RATE, "Rate", USB_MIXER_U16 },
2385         { UAC_CHORUS_DEPTH, "Depth", USB_MIXER_U16 },
2386         { 0 }
2387 };
2388 static const struct procunit_value_info dcr_proc_info[] = {
2389         { UAC_DCR_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2390         { UAC_DCR_RATE, "Ratio", USB_MIXER_U16 },
2391         { UAC_DCR_MAXAMPL, "Max Amp", USB_MIXER_S16 },
2392         { UAC_DCR_THRESHOLD, "Threshold", USB_MIXER_S16 },
2393         { UAC_DCR_ATTACK_TIME, "Attack Time", USB_MIXER_U16 },
2394         { UAC_DCR_RELEASE_TIME, "Release Time", USB_MIXER_U16 },
2395         { 0 }
2396 };
2397
2398 static const struct procunit_info procunits[] = {
2399         { UAC_PROCESS_UP_DOWNMIX, "Up Down", updown_proc_info },
2400         { UAC_PROCESS_DOLBY_PROLOGIC, "Dolby Prologic", prologic_proc_info },
2401         { UAC_PROCESS_STEREO_EXTENDER, "3D Stereo Extender", threed_enh_proc_info },
2402         { UAC_PROCESS_REVERB, "Reverb", reverb_proc_info },
2403         { UAC_PROCESS_CHORUS, "Chorus", chorus_proc_info },
2404         { UAC_PROCESS_DYN_RANGE_COMP, "DCR", dcr_proc_info },
2405         { 0 },
2406 };
2407
2408 static const struct procunit_value_info uac3_updown_proc_info[] = {
2409         { UAC3_UD_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
2410         { 0 }
2411 };
2412 static const struct procunit_value_info uac3_stereo_ext_proc_info[] = {
2413         { UAC3_EXT_WIDTH_CONTROL, "Width Control", USB_MIXER_U8 },
2414         { 0 }
2415 };
2416
2417 static const struct procunit_info uac3_procunits[] = {
2418         { UAC3_PROCESS_UP_DOWNMIX, "Up Down", uac3_updown_proc_info },
2419         { UAC3_PROCESS_STEREO_EXTENDER, "3D Stereo Extender", uac3_stereo_ext_proc_info },
2420         { UAC3_PROCESS_MULTI_FUNCTION, "Multi-Function", undefined_proc_info },
2421         { 0 },
2422 };
2423
2424 /*
2425  * predefined data for extension units
2426  */
2427 static const struct procunit_value_info clock_rate_xu_info[] = {
2428         { USB_XU_CLOCK_RATE_SELECTOR, "Selector", USB_MIXER_U8, 0 },
2429         { 0 }
2430 };
2431 static const struct procunit_value_info clock_source_xu_info[] = {
2432         { USB_XU_CLOCK_SOURCE_SELECTOR, "External", USB_MIXER_BOOLEAN },
2433         { 0 }
2434 };
2435 static const struct procunit_value_info spdif_format_xu_info[] = {
2436         { USB_XU_DIGITAL_FORMAT_SELECTOR, "SPDIF/AC3", USB_MIXER_BOOLEAN },
2437         { 0 }
2438 };
2439 static const struct procunit_value_info soft_limit_xu_info[] = {
2440         { USB_XU_SOFT_LIMIT_SELECTOR, " ", USB_MIXER_BOOLEAN },
2441         { 0 }
2442 };
2443 static const struct procunit_info extunits[] = {
2444         { USB_XU_CLOCK_RATE, "Clock rate", clock_rate_xu_info },
2445         { USB_XU_CLOCK_SOURCE, "DigitalIn CLK source", clock_source_xu_info },
2446         { USB_XU_DIGITAL_IO_STATUS, "DigitalOut format:", spdif_format_xu_info },
2447         { USB_XU_DEVICE_OPTIONS, "AnalogueIn Soft Limit", soft_limit_xu_info },
2448         { 0 }
2449 };
2450
2451 /*
2452  * build a processing/extension unit
2453  */
2454 static int build_audio_procunit(struct mixer_build *state, int unitid,
2455                                 void *raw_desc, const struct procunit_info *list,
2456                                 bool extension_unit)
2457 {
2458         struct uac_processing_unit_descriptor *desc = raw_desc;
2459         int num_ins;
2460         struct usb_mixer_elem_info *cval;
2461         struct snd_kcontrol *kctl;
2462         int i, err, nameid, type, len, val;
2463         const struct procunit_info *info;
2464         const struct procunit_value_info *valinfo;
2465         const struct usbmix_name_map *map;
2466         static const struct procunit_value_info default_value_info[] = {
2467                 { 0x01, "Switch", USB_MIXER_BOOLEAN },
2468                 { 0 }
2469         };
2470         static const struct procunit_info default_info = {
2471                 0, NULL, default_value_info
2472         };
2473         const char *name = extension_unit ?
2474                 "Extension Unit" : "Processing Unit";
2475
2476         num_ins = desc->bNrInPins;
2477         for (i = 0; i < num_ins; i++) {
2478                 err = parse_audio_unit(state, desc->baSourceID[i]);
2479                 if (err < 0)
2480                         return err;
2481         }
2482
2483         type = le16_to_cpu(desc->wProcessType);
2484         for (info = list; info && info->type; info++)
2485                 if (info->type == type)
2486                         break;
2487         if (!info || !info->type)
2488                 info = &default_info;
2489
2490         for (valinfo = info->values; valinfo->control; valinfo++) {
2491                 __u8 *controls = uac_processing_unit_bmControls(desc, state->mixer->protocol);
2492
2493                 if (state->mixer->protocol == UAC_VERSION_1) {
2494                         if (!(controls[valinfo->control / 8] &
2495                                         (1 << ((valinfo->control % 8) - 1))))
2496                                 continue;
2497                 } else { /* UAC_VERSION_2/3 */
2498                         if (!uac_v2v3_control_is_readable(controls[valinfo->control / 8],
2499                                                           valinfo->control))
2500                                 continue;
2501                 }
2502
2503                 map = find_map(state->map, unitid, valinfo->control);
2504                 if (check_ignored_ctl(map))
2505                         continue;
2506                 cval = kzalloc(sizeof(*cval), GFP_KERNEL);
2507                 if (!cval)
2508                         return -ENOMEM;
2509                 snd_usb_mixer_elem_init_std(&cval->head, state->mixer, unitid);
2510                 cval->control = valinfo->control;
2511                 cval->val_type = valinfo->val_type;
2512                 cval->channels = 1;
2513
2514                 if (state->mixer->protocol > UAC_VERSION_1 &&
2515                     !uac_v2v3_control_is_writeable(controls[valinfo->control / 8],
2516                                                    valinfo->control))
2517                         cval->master_readonly = 1;
2518
2519                 /* get min/max values */
2520                 switch (type) {
2521                 case UAC_PROCESS_UP_DOWNMIX: {
2522                         bool mode_sel = false;
2523
2524                         switch (state->mixer->protocol) {
2525                         case UAC_VERSION_1:
2526                         case UAC_VERSION_2:
2527                         default:
2528                                 if (cval->control == UAC_UD_MODE_SELECT)
2529                                         mode_sel = true;
2530                                 break;
2531                         case UAC_VERSION_3:
2532                                 if (cval->control == UAC3_UD_MODE_SELECT)
2533                                         mode_sel = true;
2534                                 break;
2535                         }
2536
2537                         if (mode_sel) {
2538                                 __u8 *control_spec = uac_processing_unit_specific(desc,
2539                                                                 state->mixer->protocol);
2540                                 cval->min = 1;
2541                                 cval->max = control_spec[0];
2542                                 cval->res = 1;
2543                                 cval->initialized = 1;
2544                                 break;
2545                         }
2546
2547                         get_min_max(cval, valinfo->min_value);
2548                         break;
2549                 }
2550                 case USB_XU_CLOCK_RATE:
2551                         /*
2552                          * E-Mu USB 0404/0202/TrackerPre/0204
2553                          * samplerate control quirk
2554                          */
2555                         cval->min = 0;
2556                         cval->max = 5;
2557                         cval->res = 1;
2558                         cval->initialized = 1;
2559                         break;
2560                 default:
2561                         get_min_max(cval, valinfo->min_value);
2562                         break;
2563                 }
2564
2565                 err = get_cur_ctl_value(cval, cval->control << 8, &val);
2566                 if (err < 0) {
2567                         usb_mixer_elem_info_free(cval);
2568                         return -EINVAL;
2569                 }
2570
2571                 kctl = snd_ctl_new1(&mixer_procunit_ctl, cval);
2572                 if (!kctl) {
2573                         usb_mixer_elem_info_free(cval);
2574                         return -ENOMEM;
2575                 }
2576                 kctl->private_free = snd_usb_mixer_elem_free;
2577
2578                 if (check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name))) {
2579                         /* nothing */ ;
2580                 } else if (info->name) {
2581                         strscpy(kctl->id.name, info->name, sizeof(kctl->id.name));
2582                 } else {
2583                         if (extension_unit)
2584                                 nameid = uac_extension_unit_iExtension(desc, state->mixer->protocol);
2585                         else
2586                                 nameid = uac_processing_unit_iProcessing(desc, state->mixer->protocol);
2587                         len = 0;
2588                         if (nameid)
2589                                 len = snd_usb_copy_string_desc(state->chip,
2590                                                                nameid,
2591                                                                kctl->id.name,
2592                                                                sizeof(kctl->id.name));
2593                         if (!len)
2594                                 strscpy(kctl->id.name, name, sizeof(kctl->id.name));
2595                 }
2596                 append_ctl_name(kctl, " ");
2597                 append_ctl_name(kctl, valinfo->suffix);
2598
2599                 usb_audio_dbg(state->chip,
2600                               "[%d] PU [%s] ch = %d, val = %d/%d\n",
2601                               cval->head.id, kctl->id.name, cval->channels,
2602                               cval->min, cval->max);
2603
2604                 err = snd_usb_mixer_add_control(&cval->head, kctl);
2605                 if (err < 0)
2606                         return err;
2607         }
2608         return 0;
2609 }
2610
2611 static int parse_audio_processing_unit(struct mixer_build *state, int unitid,
2612                                        void *raw_desc)
2613 {
2614         switch (state->mixer->protocol) {
2615         case UAC_VERSION_1:
2616         case UAC_VERSION_2:
2617         default:
2618                 return build_audio_procunit(state, unitid, raw_desc,
2619                                             procunits, false);
2620         case UAC_VERSION_3:
2621                 return build_audio_procunit(state, unitid, raw_desc,
2622                                             uac3_procunits, false);
2623         }
2624 }
2625
2626 static int parse_audio_extension_unit(struct mixer_build *state, int unitid,
2627                                       void *raw_desc)
2628 {
2629         /*
2630          * Note that we parse extension units with processing unit descriptors.
2631          * That's ok as the layout is the same.
2632          */
2633         return build_audio_procunit(state, unitid, raw_desc, extunits, true);
2634 }
2635
2636 /*
2637  * Selector Unit
2638  */
2639
2640 /*
2641  * info callback for selector unit
2642  * use an enumerator type for routing
2643  */
2644 static int mixer_ctl_selector_info(struct snd_kcontrol *kcontrol,
2645                                    struct snd_ctl_elem_info *uinfo)
2646 {
2647         struct usb_mixer_elem_info *cval = kcontrol->private_data;
2648         const char **itemlist = (const char **)kcontrol->private_value;
2649
2650         if (snd_BUG_ON(!itemlist))
2651                 return -EINVAL;
2652         return snd_ctl_enum_info(uinfo, 1, cval->max, itemlist);
2653 }
2654
2655 /* get callback for selector unit */
2656 static int mixer_ctl_selector_get(struct snd_kcontrol *kcontrol,
2657                                   struct snd_ctl_elem_value *ucontrol)
2658 {
2659         struct usb_mixer_elem_info *cval = kcontrol->private_data;
2660         int val, err;
2661
2662         err = get_cur_ctl_value(cval, cval->control << 8, &val);
2663         if (err < 0) {
2664                 ucontrol->value.enumerated.item[0] = 0;
2665                 return filter_error(cval, err);
2666         }
2667         val = get_relative_value(cval, val);
2668         ucontrol->value.enumerated.item[0] = val;
2669         return 0;
2670 }
2671
2672 /* put callback for selector unit */
2673 static int mixer_ctl_selector_put(struct snd_kcontrol *kcontrol,
2674                                   struct snd_ctl_elem_value *ucontrol)
2675 {
2676         struct usb_mixer_elem_info *cval = kcontrol->private_data;
2677         int val, oval, err;
2678
2679         err = get_cur_ctl_value(cval, cval->control << 8, &oval);
2680         if (err < 0)
2681                 return filter_error(cval, err);
2682         val = ucontrol->value.enumerated.item[0];
2683         val = get_abs_value(cval, val);
2684         if (val != oval) {
2685                 set_cur_ctl_value(cval, cval->control << 8, val);
2686                 return 1;
2687         }
2688         return 0;
2689 }
2690
2691 /* alsa control interface for selector unit */
2692 static const struct snd_kcontrol_new mixer_selectunit_ctl = {
2693         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
2694         .name = "", /* will be filled later */
2695         .info = mixer_ctl_selector_info,
2696         .get = mixer_ctl_selector_get,
2697         .put = mixer_ctl_selector_put,
2698 };
2699
2700 /*
2701  * private free callback.
2702  * free both private_data and private_value
2703  */
2704 static void usb_mixer_selector_elem_free(struct snd_kcontrol *kctl)
2705 {
2706         int i, num_ins = 0;
2707
2708         if (kctl->private_data) {
2709                 struct usb_mixer_elem_info *cval = kctl->private_data;
2710                 num_ins = cval->max;
2711                 usb_mixer_elem_info_free(cval);
2712                 kctl->private_data = NULL;
2713         }
2714         if (kctl->private_value) {
2715                 char **itemlist = (char **)kctl->private_value;
2716                 for (i = 0; i < num_ins; i++)
2717                         kfree(itemlist[i]);
2718                 kfree(itemlist);
2719                 kctl->private_value = 0;
2720         }
2721 }
2722
2723 /*
2724  * parse a selector unit
2725  */
2726 static int parse_audio_selector_unit(struct mixer_build *state, int unitid,
2727                                      void *raw_desc)
2728 {
2729         struct uac_selector_unit_descriptor *desc = raw_desc;
2730         unsigned int i, nameid, len;
2731         int err;
2732         struct usb_mixer_elem_info *cval;
2733         struct snd_kcontrol *kctl;
2734         const struct usbmix_name_map *map;
2735         char **namelist;
2736
2737         for (i = 0; i < desc->bNrInPins; i++) {
2738                 err = parse_audio_unit(state, desc->baSourceID[i]);
2739                 if (err < 0)
2740                         return err;
2741         }
2742
2743         if (desc->bNrInPins == 1) /* only one ? nonsense! */
2744                 return 0;
2745
2746         map = find_map(state->map, unitid, 0);
2747         if (check_ignored_ctl(map))
2748                 return 0;
2749
2750         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
2751         if (!cval)
2752                 return -ENOMEM;
2753         snd_usb_mixer_elem_init_std(&cval->head, state->mixer, unitid);
2754         cval->val_type = USB_MIXER_U8;
2755         cval->channels = 1;
2756         cval->min = 1;
2757         cval->max = desc->bNrInPins;
2758         cval->res = 1;
2759         cval->initialized = 1;
2760
2761         switch (state->mixer->protocol) {
2762         case UAC_VERSION_1:
2763         default:
2764                 cval->control = 0;
2765                 break;
2766         case UAC_VERSION_2:
2767         case UAC_VERSION_3:
2768                 if (desc->bDescriptorSubtype == UAC2_CLOCK_SELECTOR ||
2769                     desc->bDescriptorSubtype == UAC3_CLOCK_SELECTOR)
2770                         cval->control = UAC2_CX_CLOCK_SELECTOR;
2771                 else /* UAC2/3_SELECTOR_UNIT */
2772                         cval->control = UAC2_SU_SELECTOR;
2773                 break;
2774         }
2775
2776         namelist = kcalloc(desc->bNrInPins, sizeof(char *), GFP_KERNEL);
2777         if (!namelist) {
2778                 err = -ENOMEM;
2779                 goto error_cval;
2780         }
2781 #define MAX_ITEM_NAME_LEN       64
2782         for (i = 0; i < desc->bNrInPins; i++) {
2783                 struct usb_audio_term iterm;
2784                 namelist[i] = kmalloc(MAX_ITEM_NAME_LEN, GFP_KERNEL);
2785                 if (!namelist[i]) {
2786                         err = -ENOMEM;
2787                         goto error_name;
2788                 }
2789                 len = check_mapped_selector_name(state, unitid, i, namelist[i],
2790                                                  MAX_ITEM_NAME_LEN);
2791                 if (! len && check_input_term(state, desc->baSourceID[i], &iterm) >= 0)
2792                         len = get_term_name(state->chip, &iterm, namelist[i],
2793                                             MAX_ITEM_NAME_LEN, 0);
2794                 if (! len)
2795                         sprintf(namelist[i], "Input %u", i);
2796         }
2797
2798         kctl = snd_ctl_new1(&mixer_selectunit_ctl, cval);
2799         if (! kctl) {
2800                 usb_audio_err(state->chip, "cannot malloc kcontrol\n");
2801                 err = -ENOMEM;
2802                 goto error_name;
2803         }
2804         kctl->private_value = (unsigned long)namelist;
2805         kctl->private_free = usb_mixer_selector_elem_free;
2806
2807         /* check the static mapping table at first */
2808         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
2809         if (!len) {
2810                 /* no mapping ? */
2811                 switch (state->mixer->protocol) {
2812                 case UAC_VERSION_1:
2813                 case UAC_VERSION_2:
2814                 default:
2815                 /* if iSelector is given, use it */
2816                         nameid = uac_selector_unit_iSelector(desc);
2817                         if (nameid)
2818                                 len = snd_usb_copy_string_desc(state->chip,
2819                                                         nameid, kctl->id.name,
2820                                                         sizeof(kctl->id.name));
2821                         break;
2822                 case UAC_VERSION_3:
2823                         /* TODO: Class-Specific strings not yet supported */
2824                         break;
2825                 }
2826
2827                 /* ... or pick up the terminal name at next */
2828                 if (!len)
2829                         len = get_term_name(state->chip, &state->oterm,
2830                                     kctl->id.name, sizeof(kctl->id.name), 0);
2831                 /* ... or use the fixed string "USB" as the last resort */
2832                 if (!len)
2833                         strscpy(kctl->id.name, "USB", sizeof(kctl->id.name));
2834
2835                 /* and add the proper suffix */
2836                 if (desc->bDescriptorSubtype == UAC2_CLOCK_SELECTOR ||
2837                     desc->bDescriptorSubtype == UAC3_CLOCK_SELECTOR)
2838                         append_ctl_name(kctl, " Clock Source");
2839                 else if ((state->oterm.type & 0xff00) == 0x0100)
2840                         append_ctl_name(kctl, " Capture Source");
2841                 else
2842                         append_ctl_name(kctl, " Playback Source");
2843         }
2844
2845         usb_audio_dbg(state->chip, "[%d] SU [%s] items = %d\n",
2846                     cval->head.id, kctl->id.name, desc->bNrInPins);
2847         return snd_usb_mixer_add_control(&cval->head, kctl);
2848
2849  error_name:
2850         for (i = 0; i < desc->bNrInPins; i++)
2851                 kfree(namelist[i]);
2852         kfree(namelist);
2853  error_cval:
2854         usb_mixer_elem_info_free(cval);
2855         return err;
2856 }
2857
2858 /*
2859  * parse an audio unit recursively
2860  */
2861
2862 static int parse_audio_unit(struct mixer_build *state, int unitid)
2863 {
2864         unsigned char *p1;
2865         int protocol = state->mixer->protocol;
2866
2867         if (test_and_set_bit(unitid, state->unitbitmap))
2868                 return 0; /* the unit already visited */
2869
2870         p1 = find_audio_control_unit(state, unitid);
2871         if (!p1) {
2872                 usb_audio_err(state->chip, "unit %d not found!\n", unitid);
2873                 return -EINVAL;
2874         }
2875
2876         if (!snd_usb_validate_audio_desc(p1, protocol)) {
2877                 usb_audio_dbg(state->chip, "invalid unit %d\n", unitid);
2878                 return 0; /* skip invalid unit */
2879         }
2880
2881         switch (PTYPE(protocol, p1[2])) {
2882         case PTYPE(UAC_VERSION_1, UAC_INPUT_TERMINAL):
2883         case PTYPE(UAC_VERSION_2, UAC_INPUT_TERMINAL):
2884         case PTYPE(UAC_VERSION_3, UAC_INPUT_TERMINAL):
2885                 return parse_audio_input_terminal(state, unitid, p1);
2886         case PTYPE(UAC_VERSION_1, UAC_MIXER_UNIT):
2887         case PTYPE(UAC_VERSION_2, UAC_MIXER_UNIT):
2888         case PTYPE(UAC_VERSION_3, UAC3_MIXER_UNIT):
2889                 return parse_audio_mixer_unit(state, unitid, p1);
2890         case PTYPE(UAC_VERSION_2, UAC2_CLOCK_SOURCE):
2891         case PTYPE(UAC_VERSION_3, UAC3_CLOCK_SOURCE):
2892                 return parse_clock_source_unit(state, unitid, p1);
2893         case PTYPE(UAC_VERSION_1, UAC_SELECTOR_UNIT):
2894         case PTYPE(UAC_VERSION_2, UAC_SELECTOR_UNIT):
2895         case PTYPE(UAC_VERSION_3, UAC3_SELECTOR_UNIT):
2896         case PTYPE(UAC_VERSION_2, UAC2_CLOCK_SELECTOR):
2897         case PTYPE(UAC_VERSION_3, UAC3_CLOCK_SELECTOR):
2898                 return parse_audio_selector_unit(state, unitid, p1);
2899         case PTYPE(UAC_VERSION_1, UAC_FEATURE_UNIT):
2900         case PTYPE(UAC_VERSION_2, UAC_FEATURE_UNIT):
2901         case PTYPE(UAC_VERSION_3, UAC3_FEATURE_UNIT):
2902                 return parse_audio_feature_unit(state, unitid, p1);
2903         case PTYPE(UAC_VERSION_1, UAC1_PROCESSING_UNIT):
2904         case PTYPE(UAC_VERSION_2, UAC2_PROCESSING_UNIT_V2):
2905         case PTYPE(UAC_VERSION_3, UAC3_PROCESSING_UNIT):
2906                 return parse_audio_processing_unit(state, unitid, p1);
2907         case PTYPE(UAC_VERSION_1, UAC1_EXTENSION_UNIT):
2908         case PTYPE(UAC_VERSION_2, UAC2_EXTENSION_UNIT_V2):
2909         case PTYPE(UAC_VERSION_3, UAC3_EXTENSION_UNIT):
2910                 return parse_audio_extension_unit(state, unitid, p1);
2911         case PTYPE(UAC_VERSION_2, UAC2_EFFECT_UNIT):
2912         case PTYPE(UAC_VERSION_3, UAC3_EFFECT_UNIT):
2913                 return 0; /* FIXME - effect units not implemented yet */
2914         default:
2915                 usb_audio_err(state->chip,
2916                               "unit %u: unexpected type 0x%02x\n",
2917                               unitid, p1[2]);
2918                 return -EINVAL;
2919         }
2920 }
2921
2922 static void snd_usb_mixer_free(struct usb_mixer_interface *mixer)
2923 {
2924         /* kill pending URBs */
2925         snd_usb_mixer_disconnect(mixer);
2926
2927         kfree(mixer->id_elems);
2928         if (mixer->urb) {
2929                 kfree(mixer->urb->transfer_buffer);
2930                 usb_free_urb(mixer->urb);
2931         }
2932         usb_free_urb(mixer->rc_urb);
2933         kfree(mixer->rc_setup_packet);
2934         kfree(mixer);
2935 }
2936
2937 static int snd_usb_mixer_dev_free(struct snd_device *device)
2938 {
2939         struct usb_mixer_interface *mixer = device->device_data;
2940         snd_usb_mixer_free(mixer);
2941         return 0;
2942 }
2943
2944 /* UAC3 predefined channels configuration */
2945 struct uac3_badd_profile {
2946         int subclass;
2947         const char *name;
2948         int c_chmask;   /* capture channels mask */
2949         int p_chmask;   /* playback channels mask */
2950         int st_chmask;  /* side tone mixing channel mask */
2951 };
2952
2953 static const struct uac3_badd_profile uac3_badd_profiles[] = {
2954         {
2955                 /*
2956                  * BAIF, BAOF or combination of both
2957                  * IN: Mono or Stereo cfg, Mono alt possible
2958                  * OUT: Mono or Stereo cfg, Mono alt possible
2959                  */
2960                 .subclass = UAC3_FUNCTION_SUBCLASS_GENERIC_IO,
2961                 .name = "GENERIC IO",
2962                 .c_chmask = -1,         /* dynamic channels */
2963                 .p_chmask = -1,         /* dynamic channels */
2964         },
2965         {
2966                 /* BAOF; Stereo only cfg, Mono alt possible */
2967                 .subclass = UAC3_FUNCTION_SUBCLASS_HEADPHONE,
2968                 .name = "HEADPHONE",
2969                 .p_chmask = 3,
2970         },
2971         {
2972                 /* BAOF; Mono or Stereo cfg, Mono alt possible */
2973                 .subclass = UAC3_FUNCTION_SUBCLASS_SPEAKER,
2974                 .name = "SPEAKER",
2975                 .p_chmask = -1,         /* dynamic channels */
2976         },
2977         {
2978                 /* BAIF; Mono or Stereo cfg, Mono alt possible */
2979                 .subclass = UAC3_FUNCTION_SUBCLASS_MICROPHONE,
2980                 .name = "MICROPHONE",
2981                 .c_chmask = -1,         /* dynamic channels */
2982         },
2983         {
2984                 /*
2985                  * BAIOF topology
2986                  * IN: Mono only
2987                  * OUT: Mono or Stereo cfg, Mono alt possible
2988                  */
2989                 .subclass = UAC3_FUNCTION_SUBCLASS_HEADSET,
2990                 .name = "HEADSET",
2991                 .c_chmask = 1,
2992                 .p_chmask = -1,         /* dynamic channels */
2993                 .st_chmask = 1,
2994         },
2995         {
2996                 /* BAIOF; IN: Mono only; OUT: Stereo only, Mono alt possible */
2997                 .subclass = UAC3_FUNCTION_SUBCLASS_HEADSET_ADAPTER,
2998                 .name = "HEADSET ADAPTER",
2999                 .c_chmask = 1,
3000                 .p_chmask = 3,
3001                 .st_chmask = 1,
3002         },
3003         {
3004                 /* BAIF + BAOF; IN: Mono only; OUT: Mono only */
3005                 .subclass = UAC3_FUNCTION_SUBCLASS_SPEAKERPHONE,
3006                 .name = "SPEAKERPHONE",
3007                 .c_chmask = 1,
3008                 .p_chmask = 1,
3009         },
3010         { 0 } /* terminator */
3011 };
3012
3013 static bool uac3_badd_func_has_valid_channels(struct usb_mixer_interface *mixer,
3014                                               const struct uac3_badd_profile *f,
3015                                               int c_chmask, int p_chmask)
3016 {
3017         /*
3018          * If both playback/capture channels are dynamic, make sure
3019          * at least one channel is present
3020          */
3021         if (f->c_chmask < 0 && f->p_chmask < 0) {
3022                 if (!c_chmask && !p_chmask) {
3023                         usb_audio_warn(mixer->chip, "BAAD %s: no channels?",
3024                                        f->name);
3025                         return false;
3026                 }
3027                 return true;
3028         }
3029
3030         if ((f->c_chmask < 0 && !c_chmask) ||
3031             (f->c_chmask >= 0 && f->c_chmask != c_chmask)) {
3032                 usb_audio_warn(mixer->chip, "BAAD %s c_chmask mismatch",
3033                                f->name);
3034                 return false;
3035         }
3036         if ((f->p_chmask < 0 && !p_chmask) ||
3037             (f->p_chmask >= 0 && f->p_chmask != p_chmask)) {
3038                 usb_audio_warn(mixer->chip, "BAAD %s p_chmask mismatch",
3039                                f->name);
3040                 return false;
3041         }
3042         return true;
3043 }
3044
3045 /*
3046  * create mixer controls for UAC3 BADD profiles
3047  *
3048  * UAC3 BADD device doesn't contain CS descriptors thus we will guess everything
3049  *
3050  * BADD device may contain Mixer Unit, which doesn't have any controls, skip it
3051  */
3052 static int snd_usb_mixer_controls_badd(struct usb_mixer_interface *mixer,
3053                                        int ctrlif)
3054 {
3055         struct usb_device *dev = mixer->chip->dev;
3056         struct usb_interface_assoc_descriptor *assoc;
3057         int badd_profile = mixer->chip->badd_profile;
3058         const struct uac3_badd_profile *f;
3059         const struct usbmix_ctl_map *map;
3060         int p_chmask = 0, c_chmask = 0, st_chmask = 0;
3061         int i;
3062
3063         assoc = usb_ifnum_to_if(dev, ctrlif)->intf_assoc;
3064
3065         /* Detect BADD capture/playback channels from AS EP descriptors */
3066         for (i = 0; i < assoc->bInterfaceCount; i++) {
3067                 int intf = assoc->bFirstInterface + i;
3068
3069                 struct usb_interface *iface;
3070                 struct usb_host_interface *alts;
3071                 struct usb_interface_descriptor *altsd;
3072                 unsigned int maxpacksize;
3073                 char dir_in;
3074                 int chmask, num;
3075
3076                 if (intf == ctrlif)
3077                         continue;
3078
3079                 iface = usb_ifnum_to_if(dev, intf);
3080                 if (!iface)
3081                         continue;
3082
3083                 num = iface->num_altsetting;
3084
3085                 if (num < 2)
3086                         return -EINVAL;
3087
3088                 /*
3089                  * The number of Channels in an AudioStreaming interface
3090                  * and the audio sample bit resolution (16 bits or 24
3091                  * bits) can be derived from the wMaxPacketSize field in
3092                  * the Standard AS Audio Data Endpoint descriptor in
3093                  * Alternate Setting 1
3094                  */
3095                 alts = &iface->altsetting[1];
3096                 altsd = get_iface_desc(alts);
3097
3098                 if (altsd->bNumEndpoints < 1)
3099                         return -EINVAL;
3100
3101                 /* check direction */
3102                 dir_in = (get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN);
3103                 maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
3104
3105                 switch (maxpacksize) {
3106                 default:
3107                         usb_audio_err(mixer->chip,
3108                                 "incorrect wMaxPacketSize 0x%x for BADD profile\n",
3109                                 maxpacksize);
3110                         return -EINVAL;
3111                 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_16:
3112                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_16:
3113                 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_24:
3114                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_24:
3115                         chmask = 1;
3116                         break;
3117                 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_16:
3118                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_16:
3119                 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_24:
3120                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_24:
3121                         chmask = 3;
3122                         break;
3123                 }
3124
3125                 if (dir_in)
3126                         c_chmask = chmask;
3127                 else
3128                         p_chmask = chmask;
3129         }
3130
3131         usb_audio_dbg(mixer->chip,
3132                 "UAC3 BADD profile 0x%x: detected c_chmask=%d p_chmask=%d\n",
3133                 badd_profile, c_chmask, p_chmask);
3134
3135         /* check the mapping table */
3136         for (map = uac3_badd_usbmix_ctl_maps; map->id; map++) {
3137                 if (map->id == badd_profile)
3138                         break;
3139         }
3140
3141         if (!map->id)
3142                 return -EINVAL;
3143
3144         for (f = uac3_badd_profiles; f->name; f++) {
3145                 if (badd_profile == f->subclass)
3146                         break;
3147         }
3148         if (!f->name)
3149                 return -EINVAL;
3150         if (!uac3_badd_func_has_valid_channels(mixer, f, c_chmask, p_chmask))
3151                 return -EINVAL;
3152         st_chmask = f->st_chmask;
3153
3154         /* Playback */
3155         if (p_chmask) {
3156                 /* Master channel, always writable */
3157                 build_feature_ctl_badd(mixer, 0, UAC_FU_MUTE,
3158                                        UAC3_BADD_FU_ID2, map->map);
3159                 /* Mono/Stereo volume channels, always writable */
3160                 build_feature_ctl_badd(mixer, p_chmask, UAC_FU_VOLUME,
3161                                        UAC3_BADD_FU_ID2, map->map);
3162         }
3163
3164         /* Capture */
3165         if (c_chmask) {
3166                 /* Master channel, always writable */
3167                 build_feature_ctl_badd(mixer, 0, UAC_FU_MUTE,
3168                                        UAC3_BADD_FU_ID5, map->map);
3169                 /* Mono/Stereo volume channels, always writable */
3170                 build_feature_ctl_badd(mixer, c_chmask, UAC_FU_VOLUME,
3171                                        UAC3_BADD_FU_ID5, map->map);
3172         }
3173
3174         /* Side tone-mixing */
3175         if (st_chmask) {
3176                 /* Master channel, always writable */
3177                 build_feature_ctl_badd(mixer, 0, UAC_FU_MUTE,
3178                                        UAC3_BADD_FU_ID7, map->map);
3179                 /* Mono volume channel, always writable */
3180                 build_feature_ctl_badd(mixer, 1, UAC_FU_VOLUME,
3181                                        UAC3_BADD_FU_ID7, map->map);
3182         }
3183
3184         /* Insertion Control */
3185         if (f->subclass == UAC3_FUNCTION_SUBCLASS_HEADSET_ADAPTER) {
3186                 struct usb_audio_term iterm, oterm;
3187
3188                 /* Input Term - Insertion control */
3189                 memset(&iterm, 0, sizeof(iterm));
3190                 iterm.id = UAC3_BADD_IT_ID4;
3191                 iterm.type = UAC_BIDIR_TERMINAL_HEADSET;
3192                 build_connector_control(mixer, map->map, &iterm, true);
3193
3194                 /* Output Term - Insertion control */
3195                 memset(&oterm, 0, sizeof(oterm));
3196                 oterm.id = UAC3_BADD_OT_ID3;
3197                 oterm.type = UAC_BIDIR_TERMINAL_HEADSET;
3198                 build_connector_control(mixer, map->map, &oterm, false);
3199         }
3200
3201         return 0;
3202 }
3203
3204 /*
3205  * create mixer controls
3206  *
3207  * walk through all UAC_OUTPUT_TERMINAL descriptors to search for mixers
3208  */
3209 static int snd_usb_mixer_controls(struct usb_mixer_interface *mixer)
3210 {
3211         struct mixer_build state;
3212         int err;
3213         const struct usbmix_ctl_map *map;
3214         void *p;
3215
3216         memset(&state, 0, sizeof(state));
3217         state.chip = mixer->chip;
3218         state.mixer = mixer;
3219         state.buffer = mixer->hostif->extra;
3220         state.buflen = mixer->hostif->extralen;
3221
3222         /* check the mapping table */
3223         for (map = usbmix_ctl_maps; map->id; map++) {
3224                 if (map->id == state.chip->usb_id) {
3225                         state.map = map->map;
3226                         state.selector_map = map->selector_map;
3227                         mixer->connector_map = map->connector_map;
3228                         break;
3229                 }
3230         }
3231
3232         p = NULL;
3233         while ((p = snd_usb_find_csint_desc(mixer->hostif->extra,
3234                                             mixer->hostif->extralen,
3235                                             p, UAC_OUTPUT_TERMINAL)) != NULL) {
3236                 if (!snd_usb_validate_audio_desc(p, mixer->protocol))
3237                         continue; /* skip invalid descriptor */
3238
3239                 if (mixer->protocol == UAC_VERSION_1) {
3240                         struct uac1_output_terminal_descriptor *desc = p;
3241
3242                         /* mark terminal ID as visited */
3243                         set_bit(desc->bTerminalID, state.unitbitmap);
3244                         state.oterm.id = desc->bTerminalID;
3245                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
3246                         state.oterm.name = desc->iTerminal;
3247                         err = parse_audio_unit(&state, desc->bSourceID);
3248                         if (err < 0 && err != -EINVAL)
3249                                 return err;
3250                 } else if (mixer->protocol == UAC_VERSION_2) {
3251                         struct uac2_output_terminal_descriptor *desc = p;
3252
3253                         /* mark terminal ID as visited */
3254                         set_bit(desc->bTerminalID, state.unitbitmap);
3255                         state.oterm.id = desc->bTerminalID;
3256                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
3257                         state.oterm.name = desc->iTerminal;
3258                         err = parse_audio_unit(&state, desc->bSourceID);
3259                         if (err < 0 && err != -EINVAL)
3260                                 return err;
3261
3262                         /*
3263                          * For UAC2, use the same approach to also add the
3264                          * clock selectors
3265                          */
3266                         err = parse_audio_unit(&state, desc->bCSourceID);
3267                         if (err < 0 && err != -EINVAL)
3268                                 return err;
3269
3270                         if ((state.oterm.type & 0xff00) != 0x0100 &&
3271                             uac_v2v3_control_is_readable(le16_to_cpu(desc->bmControls),
3272                                                          UAC2_TE_CONNECTOR)) {
3273                                 build_connector_control(state.mixer, state.map,
3274                                                         &state.oterm, false);
3275                         }
3276                 } else {  /* UAC_VERSION_3 */
3277                         struct uac3_output_terminal_descriptor *desc = p;
3278
3279                         /* mark terminal ID as visited */
3280                         set_bit(desc->bTerminalID, state.unitbitmap);
3281                         state.oterm.id = desc->bTerminalID;
3282                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
3283                         state.oterm.name = le16_to_cpu(desc->wTerminalDescrStr);
3284                         err = parse_audio_unit(&state, desc->bSourceID);
3285                         if (err < 0 && err != -EINVAL)
3286                                 return err;
3287
3288                         /*
3289                          * For UAC3, use the same approach to also add the
3290                          * clock selectors
3291                          */
3292                         err = parse_audio_unit(&state, desc->bCSourceID);
3293                         if (err < 0 && err != -EINVAL)
3294                                 return err;
3295
3296                         if ((state.oterm.type & 0xff00) != 0x0100 &&
3297                             uac_v2v3_control_is_readable(le32_to_cpu(desc->bmControls),
3298                                                          UAC3_TE_INSERTION)) {
3299                                 build_connector_control(state.mixer, state.map,
3300                                                         &state.oterm, false);
3301                         }
3302                 }
3303         }
3304
3305         return 0;
3306 }
3307
3308 static int delegate_notify(struct usb_mixer_interface *mixer, int unitid,
3309                            u8 *control, u8 *channel)
3310 {
3311         const struct usbmix_connector_map *map = mixer->connector_map;
3312
3313         if (!map)
3314                 return unitid;
3315
3316         for (; map->id; map++) {
3317                 if (map->id == unitid) {
3318                         if (control && map->control)
3319                                 *control = map->control;
3320                         if (channel && map->channel)
3321                                 *channel = map->channel;
3322                         return map->delegated_id;
3323                 }
3324         }
3325         return unitid;
3326 }
3327
3328 void snd_usb_mixer_notify_id(struct usb_mixer_interface *mixer, int unitid)
3329 {
3330         struct usb_mixer_elem_list *list;
3331
3332         unitid = delegate_notify(mixer, unitid, NULL, NULL);
3333
3334         for_each_mixer_elem(list, mixer, unitid) {
3335                 struct usb_mixer_elem_info *info;
3336
3337                 if (!list->is_std_info)
3338                         continue;
3339                 info = mixer_elem_list_to_info(list);
3340                 /* invalidate cache, so the value is read from the device */
3341                 info->cached = 0;
3342                 snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
3343                                &list->kctl->id);
3344         }
3345 }
3346
3347 static void snd_usb_mixer_dump_cval(struct snd_info_buffer *buffer,
3348                                     struct usb_mixer_elem_list *list)
3349 {
3350         struct usb_mixer_elem_info *cval = mixer_elem_list_to_info(list);
3351         static const char * const val_types[] = {
3352                 [USB_MIXER_BOOLEAN] = "BOOLEAN",
3353                 [USB_MIXER_INV_BOOLEAN] = "INV_BOOLEAN",
3354                 [USB_MIXER_S8] = "S8",
3355                 [USB_MIXER_U8] = "U8",
3356                 [USB_MIXER_S16] = "S16",
3357                 [USB_MIXER_U16] = "U16",
3358                 [USB_MIXER_S32] = "S32",
3359                 [USB_MIXER_U32] = "U32",
3360                 [USB_MIXER_BESPOKEN] = "BESPOKEN",
3361         };
3362         snd_iprintf(buffer, "    Info: id=%i, control=%i, cmask=0x%x, "
3363                             "channels=%i, type=\"%s\"\n", cval->head.id,
3364                             cval->control, cval->cmask, cval->channels,
3365                             val_types[cval->val_type]);
3366         snd_iprintf(buffer, "    Volume: min=%i, max=%i, dBmin=%i, dBmax=%i\n",
3367                             cval->min, cval->max, cval->dBmin, cval->dBmax);
3368 }
3369
3370 static void snd_usb_mixer_proc_read(struct snd_info_entry *entry,
3371                                     struct snd_info_buffer *buffer)
3372 {
3373         struct snd_usb_audio *chip = entry->private_data;
3374         struct usb_mixer_interface *mixer;
3375         struct usb_mixer_elem_list *list;
3376         int unitid;
3377
3378         list_for_each_entry(mixer, &chip->mixer_list, list) {
3379                 snd_iprintf(buffer,
3380                         "USB Mixer: usb_id=0x%08x, ctrlif=%i, ctlerr=%i\n",
3381                                 chip->usb_id, mixer_ctrl_intf(mixer),
3382                                 mixer->ignore_ctl_error);
3383                 snd_iprintf(buffer, "Card: %s\n", chip->card->longname);
3384                 for (unitid = 0; unitid < MAX_ID_ELEMS; unitid++) {
3385                         for_each_mixer_elem(list, mixer, unitid) {
3386                                 snd_iprintf(buffer, "  Unit: %i\n", list->id);
3387                                 if (list->kctl)
3388                                         snd_iprintf(buffer,
3389                                                     "    Control: name=\"%s\", index=%i\n",
3390                                                     list->kctl->id.name,
3391                                                     list->kctl->id.index);
3392                                 if (list->dump)
3393                                         list->dump(buffer, list);
3394                         }
3395                 }
3396         }
3397 }
3398
3399 static void snd_usb_mixer_interrupt_v2(struct usb_mixer_interface *mixer,
3400                                        int attribute, int value, int index)
3401 {
3402         struct usb_mixer_elem_list *list;
3403         __u8 unitid = (index >> 8) & 0xff;
3404         __u8 control = (value >> 8) & 0xff;
3405         __u8 channel = value & 0xff;
3406         unsigned int count = 0;
3407
3408         if (channel >= MAX_CHANNELS) {
3409                 usb_audio_dbg(mixer->chip,
3410                         "%s(): bogus channel number %d\n",
3411                         __func__, channel);
3412                 return;
3413         }
3414
3415         unitid = delegate_notify(mixer, unitid, &control, &channel);
3416
3417         for_each_mixer_elem(list, mixer, unitid)
3418                 count++;
3419
3420         if (count == 0)
3421                 return;
3422
3423         for_each_mixer_elem(list, mixer, unitid) {
3424                 struct usb_mixer_elem_info *info;
3425
3426                 if (!list->kctl)
3427                         continue;
3428                 if (!list->is_std_info)
3429                         continue;
3430
3431                 info = mixer_elem_list_to_info(list);
3432                 if (count > 1 && info->control != control)
3433                         continue;
3434
3435                 switch (attribute) {
3436                 case UAC2_CS_CUR:
3437                         /* invalidate cache, so the value is read from the device */
3438                         if (channel)
3439                                 info->cached &= ~(1 << channel);
3440                         else /* master channel */
3441                                 info->cached = 0;
3442
3443                         snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
3444                                        &info->head.kctl->id);
3445                         break;
3446
3447                 case UAC2_CS_RANGE:
3448                         /* TODO */
3449                         break;
3450
3451                 case UAC2_CS_MEM:
3452                         /* TODO */
3453                         break;
3454
3455                 default:
3456                         usb_audio_dbg(mixer->chip,
3457                                 "unknown attribute %d in interrupt\n",
3458                                 attribute);
3459                         break;
3460                 } /* switch */
3461         }
3462 }
3463
3464 static void snd_usb_mixer_interrupt(struct urb *urb)
3465 {
3466         struct usb_mixer_interface *mixer = urb->context;
3467         int len = urb->actual_length;
3468         int ustatus = urb->status;
3469
3470         if (ustatus != 0)
3471                 goto requeue;
3472
3473         if (mixer->protocol == UAC_VERSION_1) {
3474                 struct uac1_status_word *status;
3475
3476                 for (status = urb->transfer_buffer;
3477                      len >= sizeof(*status);
3478                      len -= sizeof(*status), status++) {
3479                         dev_dbg(&urb->dev->dev, "status interrupt: %02x %02x\n",
3480                                                 status->bStatusType,
3481                                                 status->bOriginator);
3482
3483                         /* ignore any notifications not from the control interface */
3484                         if ((status->bStatusType & UAC1_STATUS_TYPE_ORIG_MASK) !=
3485                                 UAC1_STATUS_TYPE_ORIG_AUDIO_CONTROL_IF)
3486                                 continue;
3487
3488                         if (status->bStatusType & UAC1_STATUS_TYPE_MEM_CHANGED)
3489                                 snd_usb_mixer_rc_memory_change(mixer, status->bOriginator);
3490                         else
3491                                 snd_usb_mixer_notify_id(mixer, status->bOriginator);
3492                 }
3493         } else { /* UAC_VERSION_2 */
3494                 struct uac2_interrupt_data_msg *msg;
3495
3496                 for (msg = urb->transfer_buffer;
3497                      len >= sizeof(*msg);
3498                      len -= sizeof(*msg), msg++) {
3499                         /* drop vendor specific and endpoint requests */
3500                         if ((msg->bInfo & UAC2_INTERRUPT_DATA_MSG_VENDOR) ||
3501                             (msg->bInfo & UAC2_INTERRUPT_DATA_MSG_EP))
3502                                 continue;
3503
3504                         snd_usb_mixer_interrupt_v2(mixer, msg->bAttribute,
3505                                                    le16_to_cpu(msg->wValue),
3506                                                    le16_to_cpu(msg->wIndex));
3507                 }
3508         }
3509
3510 requeue:
3511         if (ustatus != -ENOENT &&
3512             ustatus != -ECONNRESET &&
3513             ustatus != -ESHUTDOWN) {
3514                 urb->dev = mixer->chip->dev;
3515                 usb_submit_urb(urb, GFP_ATOMIC);
3516         }
3517 }
3518
3519 /* create the handler for the optional status interrupt endpoint */
3520 static int snd_usb_mixer_status_create(struct usb_mixer_interface *mixer)
3521 {
3522         struct usb_endpoint_descriptor *ep;
3523         void *transfer_buffer;
3524         int buffer_length;
3525         unsigned int epnum;
3526
3527         /* we need one interrupt input endpoint */
3528         if (get_iface_desc(mixer->hostif)->bNumEndpoints < 1)
3529                 return 0;
3530         ep = get_endpoint(mixer->hostif, 0);
3531         if (!usb_endpoint_dir_in(ep) || !usb_endpoint_xfer_int(ep))
3532                 return 0;
3533
3534         epnum = usb_endpoint_num(ep);
3535         buffer_length = le16_to_cpu(ep->wMaxPacketSize);
3536         transfer_buffer = kmalloc(buffer_length, GFP_KERNEL);
3537         if (!transfer_buffer)
3538                 return -ENOMEM;
3539         mixer->urb = usb_alloc_urb(0, GFP_KERNEL);
3540         if (!mixer->urb) {
3541                 kfree(transfer_buffer);
3542                 return -ENOMEM;
3543         }
3544         usb_fill_int_urb(mixer->urb, mixer->chip->dev,
3545                          usb_rcvintpipe(mixer->chip->dev, epnum),
3546                          transfer_buffer, buffer_length,
3547                          snd_usb_mixer_interrupt, mixer, ep->bInterval);
3548         usb_submit_urb(mixer->urb, GFP_KERNEL);
3549         return 0;
3550 }
3551
3552 int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif)
3553 {
3554         static const struct snd_device_ops dev_ops = {
3555                 .dev_free = snd_usb_mixer_dev_free
3556         };
3557         struct usb_mixer_interface *mixer;
3558         int err;
3559
3560         strcpy(chip->card->mixername, "USB Mixer");
3561
3562         mixer = kzalloc(sizeof(*mixer), GFP_KERNEL);
3563         if (!mixer)
3564                 return -ENOMEM;
3565         mixer->chip = chip;
3566         mixer->ignore_ctl_error = !!(chip->quirk_flags & QUIRK_FLAG_IGNORE_CTL_ERROR);
3567         mixer->id_elems = kcalloc(MAX_ID_ELEMS, sizeof(*mixer->id_elems),
3568                                   GFP_KERNEL);
3569         if (!mixer->id_elems) {
3570                 kfree(mixer);
3571                 return -ENOMEM;
3572         }
3573
3574         mixer->hostif = &usb_ifnum_to_if(chip->dev, ctrlif)->altsetting[0];
3575         switch (get_iface_desc(mixer->hostif)->bInterfaceProtocol) {
3576         case UAC_VERSION_1:
3577         default:
3578                 mixer->protocol = UAC_VERSION_1;
3579                 break;
3580         case UAC_VERSION_2:
3581                 mixer->protocol = UAC_VERSION_2;
3582                 break;
3583         case UAC_VERSION_3:
3584                 mixer->protocol = UAC_VERSION_3;
3585                 break;
3586         }
3587
3588         if (mixer->protocol == UAC_VERSION_3 &&
3589                         chip->badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) {
3590                 err = snd_usb_mixer_controls_badd(mixer, ctrlif);
3591                 if (err < 0)
3592                         goto _error;
3593         } else {
3594                 err = snd_usb_mixer_controls(mixer);
3595                 if (err < 0)
3596                         goto _error;
3597         }
3598
3599         err = snd_usb_mixer_status_create(mixer);
3600         if (err < 0)
3601                 goto _error;
3602
3603         err = snd_usb_mixer_apply_create_quirk(mixer);
3604         if (err < 0)
3605                 goto _error;
3606
3607         err = snd_device_new(chip->card, SNDRV_DEV_CODEC, mixer, &dev_ops);
3608         if (err < 0)
3609                 goto _error;
3610
3611         if (list_empty(&chip->mixer_list))
3612                 snd_card_ro_proc_new(chip->card, "usbmixer", chip,
3613                                      snd_usb_mixer_proc_read);
3614
3615         list_add(&mixer->list, &chip->mixer_list);
3616         return 0;
3617
3618 _error:
3619         snd_usb_mixer_free(mixer);
3620         return err;
3621 }
3622
3623 void snd_usb_mixer_disconnect(struct usb_mixer_interface *mixer)
3624 {
3625         if (mixer->disconnected)
3626                 return;
3627         if (mixer->urb)
3628                 usb_kill_urb(mixer->urb);
3629         if (mixer->rc_urb)
3630                 usb_kill_urb(mixer->rc_urb);
3631         if (mixer->private_free)
3632                 mixer->private_free(mixer);
3633         mixer->disconnected = true;
3634 }
3635
3636 /* stop any bus activity of a mixer */
3637 static void snd_usb_mixer_inactivate(struct usb_mixer_interface *mixer)
3638 {
3639         usb_kill_urb(mixer->urb);
3640         usb_kill_urb(mixer->rc_urb);
3641 }
3642
3643 static int snd_usb_mixer_activate(struct usb_mixer_interface *mixer)
3644 {
3645         int err;
3646
3647         if (mixer->urb) {
3648                 err = usb_submit_urb(mixer->urb, GFP_NOIO);
3649                 if (err < 0)
3650                         return err;
3651         }
3652
3653         return 0;
3654 }
3655
3656 int snd_usb_mixer_suspend(struct usb_mixer_interface *mixer)
3657 {
3658         snd_usb_mixer_inactivate(mixer);
3659         if (mixer->private_suspend)
3660                 mixer->private_suspend(mixer);
3661         return 0;
3662 }
3663
3664 static int restore_mixer_value(struct usb_mixer_elem_list *list)
3665 {
3666         struct usb_mixer_elem_info *cval = mixer_elem_list_to_info(list);
3667         int c, err, idx;
3668
3669         if (cval->val_type == USB_MIXER_BESPOKEN)
3670                 return 0;
3671
3672         if (cval->cmask) {
3673                 idx = 0;
3674                 for (c = 0; c < MAX_CHANNELS; c++) {
3675                         if (!(cval->cmask & (1 << c)))
3676                                 continue;
3677                         if (cval->cached & (1 << (c + 1))) {
3678                                 err = snd_usb_set_cur_mix_value(cval, c + 1, idx,
3679                                                         cval->cache_val[idx]);
3680                                 if (err < 0)
3681                                         return err;
3682                         }
3683                         idx++;
3684                 }
3685         } else {
3686                 /* master */
3687                 if (cval->cached) {
3688                         err = snd_usb_set_cur_mix_value(cval, 0, 0, *cval->cache_val);
3689                         if (err < 0)
3690                                 return err;
3691                 }
3692         }
3693
3694         return 0;
3695 }
3696
3697 int snd_usb_mixer_resume(struct usb_mixer_interface *mixer)
3698 {
3699         struct usb_mixer_elem_list *list;
3700         int id, err;
3701
3702         /* restore cached mixer values */
3703         for (id = 0; id < MAX_ID_ELEMS; id++) {
3704                 for_each_mixer_elem(list, mixer, id) {
3705                         if (list->resume) {
3706                                 err = list->resume(list);
3707                                 if (err < 0)
3708                                         return err;
3709                         }
3710                 }
3711         }
3712
3713         snd_usb_mixer_resume_quirk(mixer);
3714
3715         return snd_usb_mixer_activate(mixer);
3716 }
3717
3718 void snd_usb_mixer_elem_init_std(struct usb_mixer_elem_list *list,
3719                                  struct usb_mixer_interface *mixer,
3720                                  int unitid)
3721 {
3722         list->mixer = mixer;
3723         list->id = unitid;
3724         list->dump = snd_usb_mixer_dump_cval;
3725         list->resume = restore_mixer_value;
3726 }