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         case USB_ID(0x1bcf, 0x2283): /* NexiGo N930AF FHD Webcam */
1208                 if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
1209                         usb_audio_info(chip,
1210                                 "set resolution quirk: cval->res = 16\n");
1211                         cval->res = 16;
1212                 }
1213                 break;
1214         }
1215 }
1216
1217 /* forcibly initialize the current mixer value; if GET_CUR fails, set to
1218  * the minimum as default
1219  */
1220 static void init_cur_mix_raw(struct usb_mixer_elem_info *cval, int ch, int idx)
1221 {
1222         int val, err;
1223
1224         err = snd_usb_get_cur_mix_value(cval, ch, idx, &val);
1225         if (!err)
1226                 return;
1227         if (!cval->head.mixer->ignore_ctl_error)
1228                 usb_audio_warn(cval->head.mixer->chip,
1229                                "%d:%d: failed to get current value for ch %d (%d)\n",
1230                                cval->head.id, mixer_ctrl_intf(cval->head.mixer),
1231                                ch, err);
1232         snd_usb_set_cur_mix_value(cval, ch, idx, cval->min);
1233 }
1234
1235 /*
1236  * retrieve the minimum and maximum values for the specified control
1237  */
1238 static int get_min_max_with_quirks(struct usb_mixer_elem_info *cval,
1239                                    int default_min, struct snd_kcontrol *kctl)
1240 {
1241         int i, idx;
1242
1243         /* for failsafe */
1244         cval->min = default_min;
1245         cval->max = cval->min + 1;
1246         cval->res = 1;
1247         cval->dBmin = cval->dBmax = 0;
1248
1249         if (cval->val_type == USB_MIXER_BOOLEAN ||
1250             cval->val_type == USB_MIXER_INV_BOOLEAN) {
1251                 cval->initialized = 1;
1252         } else {
1253                 int minchn = 0;
1254                 if (cval->cmask) {
1255                         for (i = 0; i < MAX_CHANNELS; i++)
1256                                 if (cval->cmask & (1 << i)) {
1257                                         minchn = i + 1;
1258                                         break;
1259                                 }
1260                 }
1261                 if (get_ctl_value(cval, UAC_GET_MAX, (cval->control << 8) | minchn, &cval->max) < 0 ||
1262                     get_ctl_value(cval, UAC_GET_MIN, (cval->control << 8) | minchn, &cval->min) < 0) {
1263                         usb_audio_err(cval->head.mixer->chip,
1264                                       "%d:%d: cannot get min/max values for control %d (id %d)\n",
1265                                    cval->head.id, mixer_ctrl_intf(cval->head.mixer),
1266                                                                cval->control, cval->head.id);
1267                         return -EINVAL;
1268                 }
1269                 if (get_ctl_value(cval, UAC_GET_RES,
1270                                   (cval->control << 8) | minchn,
1271                                   &cval->res) < 0) {
1272                         cval->res = 1;
1273                 } else if (cval->head.mixer->protocol == UAC_VERSION_1) {
1274                         int last_valid_res = cval->res;
1275
1276                         while (cval->res > 1) {
1277                                 if (snd_usb_mixer_set_ctl_value(cval, UAC_SET_RES,
1278                                                                 (cval->control << 8) | minchn,
1279                                                                 cval->res / 2) < 0)
1280                                         break;
1281                                 cval->res /= 2;
1282                         }
1283                         if (get_ctl_value(cval, UAC_GET_RES,
1284                                           (cval->control << 8) | minchn, &cval->res) < 0)
1285                                 cval->res = last_valid_res;
1286                 }
1287                 if (cval->res == 0)
1288                         cval->res = 1;
1289
1290                 /* Additional checks for the proper resolution
1291                  *
1292                  * Some devices report smaller resolutions than actually
1293                  * reacting.  They don't return errors but simply clip
1294                  * to the lower aligned value.
1295                  */
1296                 if (cval->min + cval->res < cval->max) {
1297                         int last_valid_res = cval->res;
1298                         int saved, test, check;
1299                         if (get_cur_mix_raw(cval, minchn, &saved) < 0)
1300                                 goto no_res_check;
1301                         for (;;) {
1302                                 test = saved;
1303                                 if (test < cval->max)
1304                                         test += cval->res;
1305                                 else
1306                                         test -= cval->res;
1307                                 if (test < cval->min || test > cval->max ||
1308                                     snd_usb_set_cur_mix_value(cval, minchn, 0, test) ||
1309                                     get_cur_mix_raw(cval, minchn, &check)) {
1310                                         cval->res = last_valid_res;
1311                                         break;
1312                                 }
1313                                 if (test == check)
1314                                         break;
1315                                 cval->res *= 2;
1316                         }
1317                         snd_usb_set_cur_mix_value(cval, minchn, 0, saved);
1318                 }
1319
1320 no_res_check:
1321                 cval->initialized = 1;
1322         }
1323
1324         if (kctl)
1325                 volume_control_quirks(cval, kctl);
1326
1327         /* USB descriptions contain the dB scale in 1/256 dB unit
1328          * while ALSA TLV contains in 1/100 dB unit
1329          */
1330         cval->dBmin = (convert_signed_value(cval, cval->min) * 100) / 256;
1331         cval->dBmax = (convert_signed_value(cval, cval->max) * 100) / 256;
1332         if (cval->dBmin > cval->dBmax) {
1333                 /* something is wrong; assume it's either from/to 0dB */
1334                 if (cval->dBmin < 0)
1335                         cval->dBmax = 0;
1336                 else if (cval->dBmin > 0)
1337                         cval->dBmin = 0;
1338                 if (cval->dBmin > cval->dBmax) {
1339                         /* totally crap, return an error */
1340                         return -EINVAL;
1341                 }
1342         } else {
1343                 /* if the max volume is too low, it's likely a bogus range;
1344                  * here we use -96dB as the threshold
1345                  */
1346                 if (cval->dBmax <= -9600) {
1347                         usb_audio_info(cval->head.mixer->chip,
1348                                        "%d:%d: bogus dB values (%d/%d), disabling dB reporting\n",
1349                                        cval->head.id, mixer_ctrl_intf(cval->head.mixer),
1350                                        cval->dBmin, cval->dBmax);
1351                         cval->dBmin = cval->dBmax = 0;
1352                 }
1353         }
1354
1355         /* initialize all elements */
1356         if (!cval->cmask) {
1357                 init_cur_mix_raw(cval, 0, 0);
1358         } else {
1359                 idx = 0;
1360                 for (i = 0; i < MAX_CHANNELS; i++) {
1361                         if (cval->cmask & (1 << i)) {
1362                                 init_cur_mix_raw(cval, i + 1, idx);
1363                                 idx++;
1364                         }
1365                 }
1366         }
1367
1368         return 0;
1369 }
1370
1371 #define get_min_max(cval, def)  get_min_max_with_quirks(cval, def, NULL)
1372
1373 /* get a feature/mixer unit info */
1374 static int mixer_ctl_feature_info(struct snd_kcontrol *kcontrol,
1375                                   struct snd_ctl_elem_info *uinfo)
1376 {
1377         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1378
1379         if (cval->val_type == USB_MIXER_BOOLEAN ||
1380             cval->val_type == USB_MIXER_INV_BOOLEAN)
1381                 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1382         else
1383                 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
1384         uinfo->count = cval->channels;
1385         if (cval->val_type == USB_MIXER_BOOLEAN ||
1386             cval->val_type == USB_MIXER_INV_BOOLEAN) {
1387                 uinfo->value.integer.min = 0;
1388                 uinfo->value.integer.max = 1;
1389         } else {
1390                 if (!cval->initialized) {
1391                         get_min_max_with_quirks(cval, 0, kcontrol);
1392                         if (cval->initialized && cval->dBmin >= cval->dBmax) {
1393                                 kcontrol->vd[0].access &=
1394                                         ~(SNDRV_CTL_ELEM_ACCESS_TLV_READ |
1395                                           SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK);
1396                                 snd_ctl_notify(cval->head.mixer->chip->card,
1397                                                SNDRV_CTL_EVENT_MASK_INFO,
1398                                                &kcontrol->id);
1399                         }
1400                 }
1401                 uinfo->value.integer.min = 0;
1402                 uinfo->value.integer.max =
1403                         DIV_ROUND_UP(cval->max - cval->min, cval->res);
1404         }
1405         return 0;
1406 }
1407
1408 /* get the current value from feature/mixer unit */
1409 static int mixer_ctl_feature_get(struct snd_kcontrol *kcontrol,
1410                                  struct snd_ctl_elem_value *ucontrol)
1411 {
1412         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1413         int c, cnt, val, err;
1414
1415         ucontrol->value.integer.value[0] = cval->min;
1416         if (cval->cmask) {
1417                 cnt = 0;
1418                 for (c = 0; c < MAX_CHANNELS; c++) {
1419                         if (!(cval->cmask & (1 << c)))
1420                                 continue;
1421                         err = snd_usb_get_cur_mix_value(cval, c + 1, cnt, &val);
1422                         if (err < 0)
1423                                 return filter_error(cval, err);
1424                         val = get_relative_value(cval, val);
1425                         ucontrol->value.integer.value[cnt] = val;
1426                         cnt++;
1427                 }
1428                 return 0;
1429         } else {
1430                 /* master channel */
1431                 err = snd_usb_get_cur_mix_value(cval, 0, 0, &val);
1432                 if (err < 0)
1433                         return filter_error(cval, err);
1434                 val = get_relative_value(cval, val);
1435                 ucontrol->value.integer.value[0] = val;
1436         }
1437         return 0;
1438 }
1439
1440 /* put the current value to feature/mixer unit */
1441 static int mixer_ctl_feature_put(struct snd_kcontrol *kcontrol,
1442                                  struct snd_ctl_elem_value *ucontrol)
1443 {
1444         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1445         int c, cnt, val, oval, err;
1446         int changed = 0;
1447
1448         if (cval->cmask) {
1449                 cnt = 0;
1450                 for (c = 0; c < MAX_CHANNELS; c++) {
1451                         if (!(cval->cmask & (1 << c)))
1452                                 continue;
1453                         err = snd_usb_get_cur_mix_value(cval, c + 1, cnt, &oval);
1454                         if (err < 0)
1455                                 return filter_error(cval, err);
1456                         val = ucontrol->value.integer.value[cnt];
1457                         val = get_abs_value(cval, val);
1458                         if (oval != val) {
1459                                 snd_usb_set_cur_mix_value(cval, c + 1, cnt, val);
1460                                 changed = 1;
1461                         }
1462                         cnt++;
1463                 }
1464         } else {
1465                 /* master channel */
1466                 err = snd_usb_get_cur_mix_value(cval, 0, 0, &oval);
1467                 if (err < 0)
1468                         return filter_error(cval, err);
1469                 val = ucontrol->value.integer.value[0];
1470                 val = get_abs_value(cval, val);
1471                 if (val != oval) {
1472                         snd_usb_set_cur_mix_value(cval, 0, 0, val);
1473                         changed = 1;
1474                 }
1475         }
1476         return changed;
1477 }
1478
1479 /* get the boolean value from the master channel of a UAC control */
1480 static int mixer_ctl_master_bool_get(struct snd_kcontrol *kcontrol,
1481                                      struct snd_ctl_elem_value *ucontrol)
1482 {
1483         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1484         int val, err;
1485
1486         err = snd_usb_get_cur_mix_value(cval, 0, 0, &val);
1487         if (err < 0)
1488                 return filter_error(cval, err);
1489         val = (val != 0);
1490         ucontrol->value.integer.value[0] = val;
1491         return 0;
1492 }
1493
1494 static int get_connector_value(struct usb_mixer_elem_info *cval,
1495                                char *name, int *val)
1496 {
1497         struct snd_usb_audio *chip = cval->head.mixer->chip;
1498         int idx = 0, validx, ret;
1499
1500         validx = cval->control << 8 | 0;
1501
1502         ret = snd_usb_lock_shutdown(chip) ? -EIO : 0;
1503         if (ret)
1504                 goto error;
1505
1506         idx = mixer_ctrl_intf(cval->head.mixer) | (cval->head.id << 8);
1507         if (cval->head.mixer->protocol == UAC_VERSION_2) {
1508                 struct uac2_connectors_ctl_blk uac2_conn;
1509
1510                 ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), UAC2_CS_CUR,
1511                                       USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
1512                                       validx, idx, &uac2_conn, sizeof(uac2_conn));
1513                 if (val)
1514                         *val = !!uac2_conn.bNrChannels;
1515         } else { /* UAC_VERSION_3 */
1516                 struct uac3_insertion_ctl_blk uac3_conn;
1517
1518                 ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), UAC2_CS_CUR,
1519                                       USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
1520                                       validx, idx, &uac3_conn, sizeof(uac3_conn));
1521                 if (val)
1522                         *val = !!uac3_conn.bmConInserted;
1523         }
1524
1525         snd_usb_unlock_shutdown(chip);
1526
1527         if (ret < 0) {
1528                 if (name && strstr(name, "Speaker")) {
1529                         if (val)
1530                                 *val = 1;
1531                         return 0;
1532                 }
1533 error:
1534                 usb_audio_err(chip,
1535                         "cannot get connectors status: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
1536                         UAC_GET_CUR, validx, idx, cval->val_type);
1537
1538                 if (val)
1539                         *val = 0;
1540
1541                 return filter_error(cval, ret);
1542         }
1543
1544         return ret;
1545 }
1546
1547 /* get the connectors status and report it as boolean type */
1548 static int mixer_ctl_connector_get(struct snd_kcontrol *kcontrol,
1549                                    struct snd_ctl_elem_value *ucontrol)
1550 {
1551         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1552         int ret, val;
1553
1554         ret = get_connector_value(cval, kcontrol->id.name, &val);
1555
1556         if (ret < 0)
1557                 return ret;
1558
1559         ucontrol->value.integer.value[0] = val;
1560         return 0;
1561 }
1562
1563 static const struct snd_kcontrol_new usb_feature_unit_ctl = {
1564         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1565         .name = "", /* will be filled later manually */
1566         .info = mixer_ctl_feature_info,
1567         .get = mixer_ctl_feature_get,
1568         .put = mixer_ctl_feature_put,
1569 };
1570
1571 /* the read-only variant */
1572 static const struct snd_kcontrol_new usb_feature_unit_ctl_ro = {
1573         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1574         .name = "", /* will be filled later manually */
1575         .info = mixer_ctl_feature_info,
1576         .get = mixer_ctl_feature_get,
1577         .put = NULL,
1578 };
1579
1580 /*
1581  * A control which shows the boolean value from reading a UAC control on
1582  * the master channel.
1583  */
1584 static const struct snd_kcontrol_new usb_bool_master_control_ctl_ro = {
1585         .iface = SNDRV_CTL_ELEM_IFACE_CARD,
1586         .name = "", /* will be filled later manually */
1587         .access = SNDRV_CTL_ELEM_ACCESS_READ,
1588         .info = snd_ctl_boolean_mono_info,
1589         .get = mixer_ctl_master_bool_get,
1590         .put = NULL,
1591 };
1592
1593 static const struct snd_kcontrol_new usb_connector_ctl_ro = {
1594         .iface = SNDRV_CTL_ELEM_IFACE_CARD,
1595         .name = "", /* will be filled later manually */
1596         .access = SNDRV_CTL_ELEM_ACCESS_READ,
1597         .info = snd_ctl_boolean_mono_info,
1598         .get = mixer_ctl_connector_get,
1599         .put = NULL,
1600 };
1601
1602 /*
1603  * This symbol is exported in order to allow the mixer quirks to
1604  * hook up to the standard feature unit control mechanism
1605  */
1606 const struct snd_kcontrol_new *snd_usb_feature_unit_ctl = &usb_feature_unit_ctl;
1607
1608 /*
1609  * build a feature control
1610  */
1611 static size_t append_ctl_name(struct snd_kcontrol *kctl, const char *str)
1612 {
1613         return strlcat(kctl->id.name, str, sizeof(kctl->id.name));
1614 }
1615
1616 /*
1617  * A lot of headsets/headphones have a "Speaker" mixer. Make sure we
1618  * rename it to "Headphone". We determine if something is a headphone
1619  * similar to how udev determines form factor.
1620  */
1621 static void check_no_speaker_on_headset(struct snd_kcontrol *kctl,
1622                                         struct snd_card *card)
1623 {
1624         static const char * const names_to_check[] = {
1625                 "Headset", "headset", "Headphone", "headphone", NULL};
1626         const char * const *s;
1627         bool found = false;
1628
1629         if (strcmp("Speaker", kctl->id.name))
1630                 return;
1631
1632         for (s = names_to_check; *s; s++)
1633                 if (strstr(card->shortname, *s)) {
1634                         found = true;
1635                         break;
1636                 }
1637
1638         if (!found)
1639                 return;
1640
1641         snd_ctl_rename(card, kctl, "Headphone");
1642 }
1643
1644 static const struct usb_feature_control_info *get_feature_control_info(int control)
1645 {
1646         int i;
1647
1648         for (i = 0; i < ARRAY_SIZE(audio_feature_info); ++i) {
1649                 if (audio_feature_info[i].control == control)
1650                         return &audio_feature_info[i];
1651         }
1652         return NULL;
1653 }
1654
1655 static void __build_feature_ctl(struct usb_mixer_interface *mixer,
1656                                 const struct usbmix_name_map *imap,
1657                                 unsigned int ctl_mask, int control,
1658                                 struct usb_audio_term *iterm,
1659                                 struct usb_audio_term *oterm,
1660                                 int unitid, int nameid, int readonly_mask)
1661 {
1662         const struct usb_feature_control_info *ctl_info;
1663         unsigned int len = 0;
1664         int mapped_name = 0;
1665         struct snd_kcontrol *kctl;
1666         struct usb_mixer_elem_info *cval;
1667         const struct usbmix_name_map *map;
1668         unsigned int range;
1669
1670         if (control == UAC_FU_GRAPHIC_EQUALIZER) {
1671                 /* FIXME: not supported yet */
1672                 return;
1673         }
1674
1675         map = find_map(imap, unitid, control);
1676         if (check_ignored_ctl(map))
1677                 return;
1678
1679         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1680         if (!cval)
1681                 return;
1682         snd_usb_mixer_elem_init_std(&cval->head, mixer, unitid);
1683         cval->control = control;
1684         cval->cmask = ctl_mask;
1685
1686         ctl_info = get_feature_control_info(control);
1687         if (!ctl_info) {
1688                 usb_mixer_elem_info_free(cval);
1689                 return;
1690         }
1691         if (mixer->protocol == UAC_VERSION_1)
1692                 cval->val_type = ctl_info->type;
1693         else /* UAC_VERSION_2 */
1694                 cval->val_type = ctl_info->type_uac2 >= 0 ?
1695                         ctl_info->type_uac2 : ctl_info->type;
1696
1697         if (ctl_mask == 0) {
1698                 cval->channels = 1;     /* master channel */
1699                 cval->master_readonly = readonly_mask;
1700         } else {
1701                 int i, c = 0;
1702                 for (i = 0; i < 16; i++)
1703                         if (ctl_mask & (1 << i))
1704                                 c++;
1705                 cval->channels = c;
1706                 cval->ch_readonly = readonly_mask;
1707         }
1708
1709         /*
1710          * If all channels in the mask are marked read-only, make the control
1711          * read-only. snd_usb_set_cur_mix_value() will check the mask again and won't
1712          * issue write commands to read-only channels.
1713          */
1714         if (cval->channels == readonly_mask)
1715                 kctl = snd_ctl_new1(&usb_feature_unit_ctl_ro, cval);
1716         else
1717                 kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
1718
1719         if (!kctl) {
1720                 usb_audio_err(mixer->chip, "cannot malloc kcontrol\n");
1721                 usb_mixer_elem_info_free(cval);
1722                 return;
1723         }
1724         kctl->private_free = snd_usb_mixer_elem_free;
1725
1726         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
1727         mapped_name = len != 0;
1728         if (!len && nameid)
1729                 len = snd_usb_copy_string_desc(mixer->chip, nameid,
1730                                 kctl->id.name, sizeof(kctl->id.name));
1731
1732         switch (control) {
1733         case UAC_FU_MUTE:
1734         case UAC_FU_VOLUME:
1735                 /*
1736                  * determine the control name.  the rule is:
1737                  * - if a name id is given in descriptor, use it.
1738                  * - if the connected input can be determined, then use the name
1739                  *   of terminal type.
1740                  * - if the connected output can be determined, use it.
1741                  * - otherwise, anonymous name.
1742                  */
1743                 if (!len) {
1744                         if (iterm)
1745                                 len = get_term_name(mixer->chip, iterm,
1746                                                     kctl->id.name,
1747                                                     sizeof(kctl->id.name), 1);
1748                         if (!len && oterm)
1749                                 len = get_term_name(mixer->chip, oterm,
1750                                                     kctl->id.name,
1751                                                     sizeof(kctl->id.name), 1);
1752                         if (!len)
1753                                 snprintf(kctl->id.name, sizeof(kctl->id.name),
1754                                          "Feature %d", unitid);
1755                 }
1756
1757                 if (!mapped_name)
1758                         check_no_speaker_on_headset(kctl, mixer->chip->card);
1759
1760                 /*
1761                  * determine the stream direction:
1762                  * if the connected output is USB stream, then it's likely a
1763                  * capture stream.  otherwise it should be playback (hopefully :)
1764                  */
1765                 if (!mapped_name && oterm && !(oterm->type >> 16)) {
1766                         if ((oterm->type & 0xff00) == 0x0100)
1767                                 append_ctl_name(kctl, " Capture");
1768                         else
1769                                 append_ctl_name(kctl, " Playback");
1770                 }
1771                 append_ctl_name(kctl, control == UAC_FU_MUTE ?
1772                                 " Switch" : " Volume");
1773                 break;
1774         default:
1775                 if (!len)
1776                         strscpy(kctl->id.name, audio_feature_info[control-1].name,
1777                                 sizeof(kctl->id.name));
1778                 break;
1779         }
1780
1781         /* get min/max values */
1782         get_min_max_with_quirks(cval, 0, kctl);
1783
1784         /* skip a bogus volume range */
1785         if (cval->max <= cval->min) {
1786                 usb_audio_dbg(mixer->chip,
1787                               "[%d] FU [%s] skipped due to invalid volume\n",
1788                               cval->head.id, kctl->id.name);
1789                 snd_ctl_free_one(kctl);
1790                 return;
1791         }
1792
1793
1794         if (control == UAC_FU_VOLUME) {
1795                 check_mapped_dB(map, cval);
1796                 if (cval->dBmin < cval->dBmax || !cval->initialized) {
1797                         kctl->tlv.c = snd_usb_mixer_vol_tlv;
1798                         kctl->vd[0].access |=
1799                                 SNDRV_CTL_ELEM_ACCESS_TLV_READ |
1800                                 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
1801                 }
1802         }
1803
1804         snd_usb_mixer_fu_apply_quirk(mixer, cval, unitid, kctl);
1805
1806         range = (cval->max - cval->min) / cval->res;
1807         /*
1808          * Are there devices with volume range more than 255? I use a bit more
1809          * to be sure. 384 is a resolution magic number found on Logitech
1810          * devices. It will definitively catch all buggy Logitech devices.
1811          */
1812         if (range > 384) {
1813                 usb_audio_warn(mixer->chip,
1814                                "Warning! Unlikely big volume range (=%u), cval->res is probably wrong.",
1815                                range);
1816                 usb_audio_warn(mixer->chip,
1817                                "[%d] FU [%s] ch = %d, val = %d/%d/%d",
1818                                cval->head.id, kctl->id.name, cval->channels,
1819                                cval->min, cval->max, cval->res);
1820         }
1821
1822         usb_audio_dbg(mixer->chip, "[%d] FU [%s] ch = %d, val = %d/%d/%d\n",
1823                       cval->head.id, kctl->id.name, cval->channels,
1824                       cval->min, cval->max, cval->res);
1825         snd_usb_mixer_add_control(&cval->head, kctl);
1826 }
1827
1828 static void build_feature_ctl(struct mixer_build *state, void *raw_desc,
1829                               unsigned int ctl_mask, int control,
1830                               struct usb_audio_term *iterm, int unitid,
1831                               int readonly_mask)
1832 {
1833         struct uac_feature_unit_descriptor *desc = raw_desc;
1834         int nameid = uac_feature_unit_iFeature(desc);
1835
1836         __build_feature_ctl(state->mixer, state->map, ctl_mask, control,
1837                         iterm, &state->oterm, unitid, nameid, readonly_mask);
1838 }
1839
1840 static void build_feature_ctl_badd(struct usb_mixer_interface *mixer,
1841                               unsigned int ctl_mask, int control, int unitid,
1842                               const struct usbmix_name_map *badd_map)
1843 {
1844         __build_feature_ctl(mixer, badd_map, ctl_mask, control,
1845                         NULL, NULL, unitid, 0, 0);
1846 }
1847
1848 static void get_connector_control_name(struct usb_mixer_interface *mixer,
1849                                        struct usb_audio_term *term,
1850                                        bool is_input, char *name, int name_size)
1851 {
1852         int name_len = get_term_name(mixer->chip, term, name, name_size, 0);
1853
1854         if (name_len == 0)
1855                 strscpy(name, "Unknown", name_size);
1856
1857         /*
1858          *  sound/core/ctljack.c has a convention of naming jack controls
1859          * by ending in " Jack".  Make it slightly more useful by
1860          * indicating Input or Output after the terminal name.
1861          */
1862         if (is_input)
1863                 strlcat(name, " - Input Jack", name_size);
1864         else
1865                 strlcat(name, " - Output Jack", name_size);
1866 }
1867
1868 /* get connector value to "wake up" the USB audio */
1869 static int connector_mixer_resume(struct usb_mixer_elem_list *list)
1870 {
1871         struct usb_mixer_elem_info *cval = mixer_elem_list_to_info(list);
1872
1873         get_connector_value(cval, NULL, NULL);
1874         return 0;
1875 }
1876
1877 /* Build a mixer control for a UAC connector control (jack-detect) */
1878 static void build_connector_control(struct usb_mixer_interface *mixer,
1879                                     const struct usbmix_name_map *imap,
1880                                     struct usb_audio_term *term, bool is_input)
1881 {
1882         struct snd_kcontrol *kctl;
1883         struct usb_mixer_elem_info *cval;
1884         const struct usbmix_name_map *map;
1885
1886         map = find_map(imap, term->id, 0);
1887         if (check_ignored_ctl(map))
1888                 return;
1889
1890         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1891         if (!cval)
1892                 return;
1893         snd_usb_mixer_elem_init_std(&cval->head, mixer, term->id);
1894
1895         /* set up a specific resume callback */
1896         cval->head.resume = connector_mixer_resume;
1897
1898         /*
1899          * UAC2: The first byte from reading the UAC2_TE_CONNECTOR control returns the
1900          * number of channels connected.
1901          *
1902          * UAC3: The first byte specifies size of bitmap for the inserted controls. The
1903          * following byte(s) specifies which connectors are inserted.
1904          *
1905          * This boolean ctl will simply report if any channels are connected
1906          * or not.
1907          */
1908         if (mixer->protocol == UAC_VERSION_2)
1909                 cval->control = UAC2_TE_CONNECTOR;
1910         else /* UAC_VERSION_3 */
1911                 cval->control = UAC3_TE_INSERTION;
1912
1913         cval->val_type = USB_MIXER_BOOLEAN;
1914         cval->channels = 1; /* report true if any channel is connected */
1915         cval->min = 0;
1916         cval->max = 1;
1917         kctl = snd_ctl_new1(&usb_connector_ctl_ro, cval);
1918         if (!kctl) {
1919                 usb_audio_err(mixer->chip, "cannot malloc kcontrol\n");
1920                 usb_mixer_elem_info_free(cval);
1921                 return;
1922         }
1923
1924         if (check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name)))
1925                 strlcat(kctl->id.name, " Jack", sizeof(kctl->id.name));
1926         else
1927                 get_connector_control_name(mixer, term, is_input, kctl->id.name,
1928                                            sizeof(kctl->id.name));
1929         kctl->private_free = snd_usb_mixer_elem_free;
1930         snd_usb_mixer_add_control(&cval->head, kctl);
1931 }
1932
1933 static int parse_clock_source_unit(struct mixer_build *state, int unitid,
1934                                    void *_ftr)
1935 {
1936         struct uac_clock_source_descriptor *hdr = _ftr;
1937         struct usb_mixer_elem_info *cval;
1938         struct snd_kcontrol *kctl;
1939         int ret;
1940
1941         if (state->mixer->protocol != UAC_VERSION_2)
1942                 return -EINVAL;
1943
1944         /*
1945          * The only property of this unit we are interested in is the
1946          * clock source validity. If that isn't readable, just bail out.
1947          */
1948         if (!uac_v2v3_control_is_readable(hdr->bmControls,
1949                                       UAC2_CS_CONTROL_CLOCK_VALID))
1950                 return 0;
1951
1952         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1953         if (!cval)
1954                 return -ENOMEM;
1955
1956         snd_usb_mixer_elem_init_std(&cval->head, state->mixer, hdr->bClockID);
1957
1958         cval->min = 0;
1959         cval->max = 1;
1960         cval->channels = 1;
1961         cval->val_type = USB_MIXER_BOOLEAN;
1962         cval->control = UAC2_CS_CONTROL_CLOCK_VALID;
1963
1964         cval->master_readonly = 1;
1965         /* From UAC2 5.2.5.1.2 "Only the get request is supported." */
1966         kctl = snd_ctl_new1(&usb_bool_master_control_ctl_ro, cval);
1967
1968         if (!kctl) {
1969                 usb_mixer_elem_info_free(cval);
1970                 return -ENOMEM;
1971         }
1972
1973         kctl->private_free = snd_usb_mixer_elem_free;
1974         ret = snd_usb_copy_string_desc(state->chip, hdr->iClockSource,
1975                                        kctl->id.name, sizeof(kctl->id.name));
1976         if (ret > 0)
1977                 append_ctl_name(kctl, " Validity");
1978         else
1979                 snprintf(kctl->id.name, sizeof(kctl->id.name),
1980                          "Clock Source %d Validity", hdr->bClockID);
1981
1982         return snd_usb_mixer_add_control(&cval->head, kctl);
1983 }
1984
1985 /*
1986  * parse a feature unit
1987  *
1988  * most of controls are defined here.
1989  */
1990 static int parse_audio_feature_unit(struct mixer_build *state, int unitid,
1991                                     void *_ftr)
1992 {
1993         int channels, i, j;
1994         struct usb_audio_term iterm;
1995         unsigned int master_bits;
1996         int err, csize;
1997         struct uac_feature_unit_descriptor *hdr = _ftr;
1998         __u8 *bmaControls;
1999
2000         if (state->mixer->protocol == UAC_VERSION_1) {
2001                 csize = hdr->bControlSize;
2002                 channels = (hdr->bLength - 7) / csize - 1;
2003                 bmaControls = hdr->bmaControls;
2004         } else if (state->mixer->protocol == UAC_VERSION_2) {
2005                 struct uac2_feature_unit_descriptor *ftr = _ftr;
2006                 csize = 4;
2007                 channels = (hdr->bLength - 6) / 4 - 1;
2008                 bmaControls = ftr->bmaControls;
2009         } else { /* UAC_VERSION_3 */
2010                 struct uac3_feature_unit_descriptor *ftr = _ftr;
2011
2012                 csize = 4;
2013                 channels = (ftr->bLength - 7) / 4 - 1;
2014                 bmaControls = ftr->bmaControls;
2015         }
2016
2017         /* parse the source unit */
2018         err = parse_audio_unit(state, hdr->bSourceID);
2019         if (err < 0)
2020                 return err;
2021
2022         /* determine the input source type and name */
2023         err = check_input_term(state, hdr->bSourceID, &iterm);
2024         if (err < 0)
2025                 return err;
2026
2027         master_bits = snd_usb_combine_bytes(bmaControls, csize);
2028         /* master configuration quirks */
2029         switch (state->chip->usb_id) {
2030         case USB_ID(0x08bb, 0x2702):
2031                 usb_audio_info(state->chip,
2032                                "usbmixer: master volume quirk for PCM2702 chip\n");
2033                 /* disable non-functional volume control */
2034                 master_bits &= ~UAC_CONTROL_BIT(UAC_FU_VOLUME);
2035                 break;
2036         case USB_ID(0x1130, 0xf211):
2037                 usb_audio_info(state->chip,
2038                                "usbmixer: volume control quirk for Tenx TP6911 Audio Headset\n");
2039                 /* disable non-functional volume control */
2040                 channels = 0;
2041                 break;
2042
2043         }
2044
2045         if (state->mixer->protocol == UAC_VERSION_1) {
2046                 /* check all control types */
2047                 for (i = 0; i < 10; i++) {
2048                         unsigned int ch_bits = 0;
2049                         int control = audio_feature_info[i].control;
2050
2051                         for (j = 0; j < channels; j++) {
2052                                 unsigned int mask;
2053
2054                                 mask = snd_usb_combine_bytes(bmaControls +
2055                                                              csize * (j+1), csize);
2056                                 if (mask & (1 << i))
2057                                         ch_bits |= (1 << j);
2058                         }
2059                         /* audio class v1 controls are never read-only */
2060
2061                         /*
2062                          * The first channel must be set
2063                          * (for ease of programming).
2064                          */
2065                         if (ch_bits & 1)
2066                                 build_feature_ctl(state, _ftr, ch_bits, control,
2067                                                   &iterm, unitid, 0);
2068                         if (master_bits & (1 << i))
2069                                 build_feature_ctl(state, _ftr, 0, control,
2070                                                   &iterm, unitid, 0);
2071                 }
2072         } else { /* UAC_VERSION_2/3 */
2073                 for (i = 0; i < ARRAY_SIZE(audio_feature_info); i++) {
2074                         unsigned int ch_bits = 0;
2075                         unsigned int ch_read_only = 0;
2076                         int control = audio_feature_info[i].control;
2077
2078                         for (j = 0; j < channels; j++) {
2079                                 unsigned int mask;
2080
2081                                 mask = snd_usb_combine_bytes(bmaControls +
2082                                                              csize * (j+1), csize);
2083                                 if (uac_v2v3_control_is_readable(mask, control)) {
2084                                         ch_bits |= (1 << j);
2085                                         if (!uac_v2v3_control_is_writeable(mask, control))
2086                                                 ch_read_only |= (1 << j);
2087                                 }
2088                         }
2089
2090                         /*
2091                          * NOTE: build_feature_ctl() will mark the control
2092                          * read-only if all channels are marked read-only in
2093                          * the descriptors. Otherwise, the control will be
2094                          * reported as writeable, but the driver will not
2095                          * actually issue a write command for read-only
2096                          * channels.
2097                          */
2098
2099                         /*
2100                          * The first channel must be set
2101                          * (for ease of programming).
2102                          */
2103                         if (ch_bits & 1)
2104                                 build_feature_ctl(state, _ftr, ch_bits, control,
2105                                                   &iterm, unitid, ch_read_only);
2106                         if (uac_v2v3_control_is_readable(master_bits, control))
2107                                 build_feature_ctl(state, _ftr, 0, control,
2108                                                   &iterm, unitid,
2109                                                   !uac_v2v3_control_is_writeable(master_bits,
2110                                                                                  control));
2111                 }
2112         }
2113
2114         return 0;
2115 }
2116
2117 /*
2118  * Mixer Unit
2119  */
2120
2121 /* check whether the given in/out overflows bmMixerControls matrix */
2122 static bool mixer_bitmap_overflow(struct uac_mixer_unit_descriptor *desc,
2123                                   int protocol, int num_ins, int num_outs)
2124 {
2125         u8 *hdr = (u8 *)desc;
2126         u8 *c = uac_mixer_unit_bmControls(desc, protocol);
2127         size_t rest; /* remaining bytes after bmMixerControls */
2128
2129         switch (protocol) {
2130         case UAC_VERSION_1:
2131         default:
2132                 rest = 1; /* iMixer */
2133                 break;
2134         case UAC_VERSION_2:
2135                 rest = 2; /* bmControls + iMixer */
2136                 break;
2137         case UAC_VERSION_3:
2138                 rest = 6; /* bmControls + wMixerDescrStr */
2139                 break;
2140         }
2141
2142         /* overflow? */
2143         return c + (num_ins * num_outs + 7) / 8 + rest > hdr + hdr[0];
2144 }
2145
2146 /*
2147  * build a mixer unit control
2148  *
2149  * the callbacks are identical with feature unit.
2150  * input channel number (zero based) is given in control field instead.
2151  */
2152 static void build_mixer_unit_ctl(struct mixer_build *state,
2153                                  struct uac_mixer_unit_descriptor *desc,
2154                                  int in_pin, int in_ch, int num_outs,
2155                                  int unitid, struct usb_audio_term *iterm)
2156 {
2157         struct usb_mixer_elem_info *cval;
2158         unsigned int i, len;
2159         struct snd_kcontrol *kctl;
2160         const struct usbmix_name_map *map;
2161
2162         map = find_map(state->map, unitid, 0);
2163         if (check_ignored_ctl(map))
2164                 return;
2165
2166         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
2167         if (!cval)
2168                 return;
2169
2170         snd_usb_mixer_elem_init_std(&cval->head, state->mixer, unitid);
2171         cval->control = in_ch + 1; /* based on 1 */
2172         cval->val_type = USB_MIXER_S16;
2173         for (i = 0; i < num_outs; i++) {
2174                 __u8 *c = uac_mixer_unit_bmControls(desc, state->mixer->protocol);
2175
2176                 if (check_matrix_bitmap(c, in_ch, i, num_outs)) {
2177                         cval->cmask |= (1 << i);
2178                         cval->channels++;
2179                 }
2180         }
2181
2182         /* get min/max values */
2183         get_min_max(cval, 0);
2184
2185         kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
2186         if (!kctl) {
2187                 usb_audio_err(state->chip, "cannot malloc kcontrol\n");
2188                 usb_mixer_elem_info_free(cval);
2189                 return;
2190         }
2191         kctl->private_free = snd_usb_mixer_elem_free;
2192
2193         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
2194         if (!len)
2195                 len = get_term_name(state->chip, iterm, kctl->id.name,
2196                                     sizeof(kctl->id.name), 0);
2197         if (!len)
2198                 len = sprintf(kctl->id.name, "Mixer Source %d", in_ch + 1);
2199         append_ctl_name(kctl, " Volume");
2200
2201         usb_audio_dbg(state->chip, "[%d] MU [%s] ch = %d, val = %d/%d\n",
2202                     cval->head.id, kctl->id.name, cval->channels, cval->min, cval->max);
2203         snd_usb_mixer_add_control(&cval->head, kctl);
2204 }
2205
2206 static int parse_audio_input_terminal(struct mixer_build *state, int unitid,
2207                                       void *raw_desc)
2208 {
2209         struct usb_audio_term iterm;
2210         unsigned int control, bmctls, term_id;
2211
2212         if (state->mixer->protocol == UAC_VERSION_2) {
2213                 struct uac2_input_terminal_descriptor *d_v2 = raw_desc;
2214                 control = UAC2_TE_CONNECTOR;
2215                 term_id = d_v2->bTerminalID;
2216                 bmctls = le16_to_cpu(d_v2->bmControls);
2217         } else if (state->mixer->protocol == UAC_VERSION_3) {
2218                 struct uac3_input_terminal_descriptor *d_v3 = raw_desc;
2219                 control = UAC3_TE_INSERTION;
2220                 term_id = d_v3->bTerminalID;
2221                 bmctls = le32_to_cpu(d_v3->bmControls);
2222         } else {
2223                 return 0; /* UAC1. No Insertion control */
2224         }
2225
2226         check_input_term(state, term_id, &iterm);
2227
2228         /* Check for jack detection. */
2229         if ((iterm.type & 0xff00) != 0x0100 &&
2230             uac_v2v3_control_is_readable(bmctls, control))
2231                 build_connector_control(state->mixer, state->map, &iterm, true);
2232
2233         return 0;
2234 }
2235
2236 /*
2237  * parse a mixer unit
2238  */
2239 static int parse_audio_mixer_unit(struct mixer_build *state, int unitid,
2240                                   void *raw_desc)
2241 {
2242         struct uac_mixer_unit_descriptor *desc = raw_desc;
2243         struct usb_audio_term iterm;
2244         int input_pins, num_ins, num_outs;
2245         int pin, ich, err;
2246
2247         err = uac_mixer_unit_get_channels(state, desc);
2248         if (err < 0) {
2249                 usb_audio_err(state->chip,
2250                               "invalid MIXER UNIT descriptor %d\n",
2251                               unitid);
2252                 return err;
2253         }
2254
2255         num_outs = err;
2256         input_pins = desc->bNrInPins;
2257
2258         num_ins = 0;
2259         ich = 0;
2260         for (pin = 0; pin < input_pins; pin++) {
2261                 err = parse_audio_unit(state, desc->baSourceID[pin]);
2262                 if (err < 0)
2263                         continue;
2264                 /* no bmControls field (e.g. Maya44) -> ignore */
2265                 if (!num_outs)
2266                         continue;
2267                 err = check_input_term(state, desc->baSourceID[pin], &iterm);
2268                 if (err < 0)
2269                         return err;
2270                 num_ins += iterm.channels;
2271                 if (mixer_bitmap_overflow(desc, state->mixer->protocol,
2272                                           num_ins, num_outs))
2273                         break;
2274                 for (; ich < num_ins; ich++) {
2275                         int och, ich_has_controls = 0;
2276
2277                         for (och = 0; och < num_outs; och++) {
2278                                 __u8 *c = uac_mixer_unit_bmControls(desc,
2279                                                 state->mixer->protocol);
2280
2281                                 if (check_matrix_bitmap(c, ich, och, num_outs)) {
2282                                         ich_has_controls = 1;
2283                                         break;
2284                                 }
2285                         }
2286                         if (ich_has_controls)
2287                                 build_mixer_unit_ctl(state, desc, pin, ich, num_outs,
2288                                                      unitid, &iterm);
2289                 }
2290         }
2291         return 0;
2292 }
2293
2294 /*
2295  * Processing Unit / Extension Unit
2296  */
2297
2298 /* get callback for processing/extension unit */
2299 static int mixer_ctl_procunit_get(struct snd_kcontrol *kcontrol,
2300                                   struct snd_ctl_elem_value *ucontrol)
2301 {
2302         struct usb_mixer_elem_info *cval = kcontrol->private_data;
2303         int err, val;
2304
2305         err = get_cur_ctl_value(cval, cval->control << 8, &val);
2306         if (err < 0) {
2307                 ucontrol->value.integer.value[0] = cval->min;
2308                 return filter_error(cval, err);
2309         }
2310         val = get_relative_value(cval, val);
2311         ucontrol->value.integer.value[0] = val;
2312         return 0;
2313 }
2314
2315 /* put callback for processing/extension unit */
2316 static int mixer_ctl_procunit_put(struct snd_kcontrol *kcontrol,
2317                                   struct snd_ctl_elem_value *ucontrol)
2318 {
2319         struct usb_mixer_elem_info *cval = kcontrol->private_data;
2320         int val, oval, err;
2321
2322         err = get_cur_ctl_value(cval, cval->control << 8, &oval);
2323         if (err < 0)
2324                 return filter_error(cval, err);
2325         val = ucontrol->value.integer.value[0];
2326         val = get_abs_value(cval, val);
2327         if (val != oval) {
2328                 set_cur_ctl_value(cval, cval->control << 8, val);
2329                 return 1;
2330         }
2331         return 0;
2332 }
2333
2334 /* alsa control interface for processing/extension unit */
2335 static const struct snd_kcontrol_new mixer_procunit_ctl = {
2336         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
2337         .name = "", /* will be filled later */
2338         .info = mixer_ctl_feature_info,
2339         .get = mixer_ctl_procunit_get,
2340         .put = mixer_ctl_procunit_put,
2341 };
2342
2343 /*
2344  * predefined data for processing units
2345  */
2346 struct procunit_value_info {
2347         int control;
2348         const char *suffix;
2349         int val_type;
2350         int min_value;
2351 };
2352
2353 struct procunit_info {
2354         int type;
2355         char *name;
2356         const struct procunit_value_info *values;
2357 };
2358
2359 static const struct procunit_value_info undefined_proc_info[] = {
2360         { 0x00, "Control Undefined", 0 },
2361         { 0 }
2362 };
2363
2364 static const struct procunit_value_info updown_proc_info[] = {
2365         { UAC_UD_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2366         { UAC_UD_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
2367         { 0 }
2368 };
2369 static const struct procunit_value_info prologic_proc_info[] = {
2370         { UAC_DP_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2371         { UAC_DP_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
2372         { 0 }
2373 };
2374 static const struct procunit_value_info threed_enh_proc_info[] = {
2375         { UAC_3D_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2376         { UAC_3D_SPACE, "Spaciousness", USB_MIXER_U8 },
2377         { 0 }
2378 };
2379 static const struct procunit_value_info reverb_proc_info[] = {
2380         { UAC_REVERB_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2381         { UAC_REVERB_LEVEL, "Level", USB_MIXER_U8 },
2382         { UAC_REVERB_TIME, "Time", USB_MIXER_U16 },
2383         { UAC_REVERB_FEEDBACK, "Feedback", USB_MIXER_U8 },
2384         { 0 }
2385 };
2386 static const struct procunit_value_info chorus_proc_info[] = {
2387         { UAC_CHORUS_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2388         { UAC_CHORUS_LEVEL, "Level", USB_MIXER_U8 },
2389         { UAC_CHORUS_RATE, "Rate", USB_MIXER_U16 },
2390         { UAC_CHORUS_DEPTH, "Depth", USB_MIXER_U16 },
2391         { 0 }
2392 };
2393 static const struct procunit_value_info dcr_proc_info[] = {
2394         { UAC_DCR_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2395         { UAC_DCR_RATE, "Ratio", USB_MIXER_U16 },
2396         { UAC_DCR_MAXAMPL, "Max Amp", USB_MIXER_S16 },
2397         { UAC_DCR_THRESHOLD, "Threshold", USB_MIXER_S16 },
2398         { UAC_DCR_ATTACK_TIME, "Attack Time", USB_MIXER_U16 },
2399         { UAC_DCR_RELEASE_TIME, "Release Time", USB_MIXER_U16 },
2400         { 0 }
2401 };
2402
2403 static const struct procunit_info procunits[] = {
2404         { UAC_PROCESS_UP_DOWNMIX, "Up Down", updown_proc_info },
2405         { UAC_PROCESS_DOLBY_PROLOGIC, "Dolby Prologic", prologic_proc_info },
2406         { UAC_PROCESS_STEREO_EXTENDER, "3D Stereo Extender", threed_enh_proc_info },
2407         { UAC_PROCESS_REVERB, "Reverb", reverb_proc_info },
2408         { UAC_PROCESS_CHORUS, "Chorus", chorus_proc_info },
2409         { UAC_PROCESS_DYN_RANGE_COMP, "DCR", dcr_proc_info },
2410         { 0 },
2411 };
2412
2413 static const struct procunit_value_info uac3_updown_proc_info[] = {
2414         { UAC3_UD_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
2415         { 0 }
2416 };
2417 static const struct procunit_value_info uac3_stereo_ext_proc_info[] = {
2418         { UAC3_EXT_WIDTH_CONTROL, "Width Control", USB_MIXER_U8 },
2419         { 0 }
2420 };
2421
2422 static const struct procunit_info uac3_procunits[] = {
2423         { UAC3_PROCESS_UP_DOWNMIX, "Up Down", uac3_updown_proc_info },
2424         { UAC3_PROCESS_STEREO_EXTENDER, "3D Stereo Extender", uac3_stereo_ext_proc_info },
2425         { UAC3_PROCESS_MULTI_FUNCTION, "Multi-Function", undefined_proc_info },
2426         { 0 },
2427 };
2428
2429 /*
2430  * predefined data for extension units
2431  */
2432 static const struct procunit_value_info clock_rate_xu_info[] = {
2433         { USB_XU_CLOCK_RATE_SELECTOR, "Selector", USB_MIXER_U8, 0 },
2434         { 0 }
2435 };
2436 static const struct procunit_value_info clock_source_xu_info[] = {
2437         { USB_XU_CLOCK_SOURCE_SELECTOR, "External", USB_MIXER_BOOLEAN },
2438         { 0 }
2439 };
2440 static const struct procunit_value_info spdif_format_xu_info[] = {
2441         { USB_XU_DIGITAL_FORMAT_SELECTOR, "SPDIF/AC3", USB_MIXER_BOOLEAN },
2442         { 0 }
2443 };
2444 static const struct procunit_value_info soft_limit_xu_info[] = {
2445         { USB_XU_SOFT_LIMIT_SELECTOR, " ", USB_MIXER_BOOLEAN },
2446         { 0 }
2447 };
2448 static const struct procunit_info extunits[] = {
2449         { USB_XU_CLOCK_RATE, "Clock rate", clock_rate_xu_info },
2450         { USB_XU_CLOCK_SOURCE, "DigitalIn CLK source", clock_source_xu_info },
2451         { USB_XU_DIGITAL_IO_STATUS, "DigitalOut format:", spdif_format_xu_info },
2452         { USB_XU_DEVICE_OPTIONS, "AnalogueIn Soft Limit", soft_limit_xu_info },
2453         { 0 }
2454 };
2455
2456 /*
2457  * build a processing/extension unit
2458  */
2459 static int build_audio_procunit(struct mixer_build *state, int unitid,
2460                                 void *raw_desc, const struct procunit_info *list,
2461                                 bool extension_unit)
2462 {
2463         struct uac_processing_unit_descriptor *desc = raw_desc;
2464         int num_ins;
2465         struct usb_mixer_elem_info *cval;
2466         struct snd_kcontrol *kctl;
2467         int i, err, nameid, type, len, val;
2468         const struct procunit_info *info;
2469         const struct procunit_value_info *valinfo;
2470         const struct usbmix_name_map *map;
2471         static const struct procunit_value_info default_value_info[] = {
2472                 { 0x01, "Switch", USB_MIXER_BOOLEAN },
2473                 { 0 }
2474         };
2475         static const struct procunit_info default_info = {
2476                 0, NULL, default_value_info
2477         };
2478         const char *name = extension_unit ?
2479                 "Extension Unit" : "Processing Unit";
2480
2481         num_ins = desc->bNrInPins;
2482         for (i = 0; i < num_ins; i++) {
2483                 err = parse_audio_unit(state, desc->baSourceID[i]);
2484                 if (err < 0)
2485                         return err;
2486         }
2487
2488         type = le16_to_cpu(desc->wProcessType);
2489         for (info = list; info && info->type; info++)
2490                 if (info->type == type)
2491                         break;
2492         if (!info || !info->type)
2493                 info = &default_info;
2494
2495         for (valinfo = info->values; valinfo->control; valinfo++) {
2496                 __u8 *controls = uac_processing_unit_bmControls(desc, state->mixer->protocol);
2497
2498                 if (state->mixer->protocol == UAC_VERSION_1) {
2499                         if (!(controls[valinfo->control / 8] &
2500                                         (1 << ((valinfo->control % 8) - 1))))
2501                                 continue;
2502                 } else { /* UAC_VERSION_2/3 */
2503                         if (!uac_v2v3_control_is_readable(controls[valinfo->control / 8],
2504                                                           valinfo->control))
2505                                 continue;
2506                 }
2507
2508                 map = find_map(state->map, unitid, valinfo->control);
2509                 if (check_ignored_ctl(map))
2510                         continue;
2511                 cval = kzalloc(sizeof(*cval), GFP_KERNEL);
2512                 if (!cval)
2513                         return -ENOMEM;
2514                 snd_usb_mixer_elem_init_std(&cval->head, state->mixer, unitid);
2515                 cval->control = valinfo->control;
2516                 cval->val_type = valinfo->val_type;
2517                 cval->channels = 1;
2518
2519                 if (state->mixer->protocol > UAC_VERSION_1 &&
2520                     !uac_v2v3_control_is_writeable(controls[valinfo->control / 8],
2521                                                    valinfo->control))
2522                         cval->master_readonly = 1;
2523
2524                 /* get min/max values */
2525                 switch (type) {
2526                 case UAC_PROCESS_UP_DOWNMIX: {
2527                         bool mode_sel = false;
2528
2529                         switch (state->mixer->protocol) {
2530                         case UAC_VERSION_1:
2531                         case UAC_VERSION_2:
2532                         default:
2533                                 if (cval->control == UAC_UD_MODE_SELECT)
2534                                         mode_sel = true;
2535                                 break;
2536                         case UAC_VERSION_3:
2537                                 if (cval->control == UAC3_UD_MODE_SELECT)
2538                                         mode_sel = true;
2539                                 break;
2540                         }
2541
2542                         if (mode_sel) {
2543                                 __u8 *control_spec = uac_processing_unit_specific(desc,
2544                                                                 state->mixer->protocol);
2545                                 cval->min = 1;
2546                                 cval->max = control_spec[0];
2547                                 cval->res = 1;
2548                                 cval->initialized = 1;
2549                                 break;
2550                         }
2551
2552                         get_min_max(cval, valinfo->min_value);
2553                         break;
2554                 }
2555                 case USB_XU_CLOCK_RATE:
2556                         /*
2557                          * E-Mu USB 0404/0202/TrackerPre/0204
2558                          * samplerate control quirk
2559                          */
2560                         cval->min = 0;
2561                         cval->max = 5;
2562                         cval->res = 1;
2563                         cval->initialized = 1;
2564                         break;
2565                 default:
2566                         get_min_max(cval, valinfo->min_value);
2567                         break;
2568                 }
2569
2570                 err = get_cur_ctl_value(cval, cval->control << 8, &val);
2571                 if (err < 0) {
2572                         usb_mixer_elem_info_free(cval);
2573                         return -EINVAL;
2574                 }
2575
2576                 kctl = snd_ctl_new1(&mixer_procunit_ctl, cval);
2577                 if (!kctl) {
2578                         usb_mixer_elem_info_free(cval);
2579                         return -ENOMEM;
2580                 }
2581                 kctl->private_free = snd_usb_mixer_elem_free;
2582
2583                 if (check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name))) {
2584                         /* nothing */ ;
2585                 } else if (info->name) {
2586                         strscpy(kctl->id.name, info->name, sizeof(kctl->id.name));
2587                 } else {
2588                         if (extension_unit)
2589                                 nameid = uac_extension_unit_iExtension(desc, state->mixer->protocol);
2590                         else
2591                                 nameid = uac_processing_unit_iProcessing(desc, state->mixer->protocol);
2592                         len = 0;
2593                         if (nameid)
2594                                 len = snd_usb_copy_string_desc(state->chip,
2595                                                                nameid,
2596                                                                kctl->id.name,
2597                                                                sizeof(kctl->id.name));
2598                         if (!len)
2599                                 strscpy(kctl->id.name, name, sizeof(kctl->id.name));
2600                 }
2601                 append_ctl_name(kctl, " ");
2602                 append_ctl_name(kctl, valinfo->suffix);
2603
2604                 usb_audio_dbg(state->chip,
2605                               "[%d] PU [%s] ch = %d, val = %d/%d\n",
2606                               cval->head.id, kctl->id.name, cval->channels,
2607                               cval->min, cval->max);
2608
2609                 err = snd_usb_mixer_add_control(&cval->head, kctl);
2610                 if (err < 0)
2611                         return err;
2612         }
2613         return 0;
2614 }
2615
2616 static int parse_audio_processing_unit(struct mixer_build *state, int unitid,
2617                                        void *raw_desc)
2618 {
2619         switch (state->mixer->protocol) {
2620         case UAC_VERSION_1:
2621         case UAC_VERSION_2:
2622         default:
2623                 return build_audio_procunit(state, unitid, raw_desc,
2624                                             procunits, false);
2625         case UAC_VERSION_3:
2626                 return build_audio_procunit(state, unitid, raw_desc,
2627                                             uac3_procunits, false);
2628         }
2629 }
2630
2631 static int parse_audio_extension_unit(struct mixer_build *state, int unitid,
2632                                       void *raw_desc)
2633 {
2634         /*
2635          * Note that we parse extension units with processing unit descriptors.
2636          * That's ok as the layout is the same.
2637          */
2638         return build_audio_procunit(state, unitid, raw_desc, extunits, true);
2639 }
2640
2641 /*
2642  * Selector Unit
2643  */
2644
2645 /*
2646  * info callback for selector unit
2647  * use an enumerator type for routing
2648  */
2649 static int mixer_ctl_selector_info(struct snd_kcontrol *kcontrol,
2650                                    struct snd_ctl_elem_info *uinfo)
2651 {
2652         struct usb_mixer_elem_info *cval = kcontrol->private_data;
2653         const char **itemlist = (const char **)kcontrol->private_value;
2654
2655         if (snd_BUG_ON(!itemlist))
2656                 return -EINVAL;
2657         return snd_ctl_enum_info(uinfo, 1, cval->max, itemlist);
2658 }
2659
2660 /* get callback for selector unit */
2661 static int mixer_ctl_selector_get(struct snd_kcontrol *kcontrol,
2662                                   struct snd_ctl_elem_value *ucontrol)
2663 {
2664         struct usb_mixer_elem_info *cval = kcontrol->private_data;
2665         int val, err;
2666
2667         err = get_cur_ctl_value(cval, cval->control << 8, &val);
2668         if (err < 0) {
2669                 ucontrol->value.enumerated.item[0] = 0;
2670                 return filter_error(cval, err);
2671         }
2672         val = get_relative_value(cval, val);
2673         ucontrol->value.enumerated.item[0] = val;
2674         return 0;
2675 }
2676
2677 /* put callback for selector unit */
2678 static int mixer_ctl_selector_put(struct snd_kcontrol *kcontrol,
2679                                   struct snd_ctl_elem_value *ucontrol)
2680 {
2681         struct usb_mixer_elem_info *cval = kcontrol->private_data;
2682         int val, oval, err;
2683
2684         err = get_cur_ctl_value(cval, cval->control << 8, &oval);
2685         if (err < 0)
2686                 return filter_error(cval, err);
2687         val = ucontrol->value.enumerated.item[0];
2688         val = get_abs_value(cval, val);
2689         if (val != oval) {
2690                 set_cur_ctl_value(cval, cval->control << 8, val);
2691                 return 1;
2692         }
2693         return 0;
2694 }
2695
2696 /* alsa control interface for selector unit */
2697 static const struct snd_kcontrol_new mixer_selectunit_ctl = {
2698         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
2699         .name = "", /* will be filled later */
2700         .info = mixer_ctl_selector_info,
2701         .get = mixer_ctl_selector_get,
2702         .put = mixer_ctl_selector_put,
2703 };
2704
2705 /*
2706  * private free callback.
2707  * free both private_data and private_value
2708  */
2709 static void usb_mixer_selector_elem_free(struct snd_kcontrol *kctl)
2710 {
2711         int i, num_ins = 0;
2712
2713         if (kctl->private_data) {
2714                 struct usb_mixer_elem_info *cval = kctl->private_data;
2715                 num_ins = cval->max;
2716                 usb_mixer_elem_info_free(cval);
2717                 kctl->private_data = NULL;
2718         }
2719         if (kctl->private_value) {
2720                 char **itemlist = (char **)kctl->private_value;
2721                 for (i = 0; i < num_ins; i++)
2722                         kfree(itemlist[i]);
2723                 kfree(itemlist);
2724                 kctl->private_value = 0;
2725         }
2726 }
2727
2728 /*
2729  * parse a selector unit
2730  */
2731 static int parse_audio_selector_unit(struct mixer_build *state, int unitid,
2732                                      void *raw_desc)
2733 {
2734         struct uac_selector_unit_descriptor *desc = raw_desc;
2735         unsigned int i, nameid, len;
2736         int err;
2737         struct usb_mixer_elem_info *cval;
2738         struct snd_kcontrol *kctl;
2739         const struct usbmix_name_map *map;
2740         char **namelist;
2741
2742         for (i = 0; i < desc->bNrInPins; i++) {
2743                 err = parse_audio_unit(state, desc->baSourceID[i]);
2744                 if (err < 0)
2745                         return err;
2746         }
2747
2748         if (desc->bNrInPins == 1) /* only one ? nonsense! */
2749                 return 0;
2750
2751         map = find_map(state->map, unitid, 0);
2752         if (check_ignored_ctl(map))
2753                 return 0;
2754
2755         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
2756         if (!cval)
2757                 return -ENOMEM;
2758         snd_usb_mixer_elem_init_std(&cval->head, state->mixer, unitid);
2759         cval->val_type = USB_MIXER_U8;
2760         cval->channels = 1;
2761         cval->min = 1;
2762         cval->max = desc->bNrInPins;
2763         cval->res = 1;
2764         cval->initialized = 1;
2765
2766         switch (state->mixer->protocol) {
2767         case UAC_VERSION_1:
2768         default:
2769                 cval->control = 0;
2770                 break;
2771         case UAC_VERSION_2:
2772         case UAC_VERSION_3:
2773                 if (desc->bDescriptorSubtype == UAC2_CLOCK_SELECTOR ||
2774                     desc->bDescriptorSubtype == UAC3_CLOCK_SELECTOR)
2775                         cval->control = UAC2_CX_CLOCK_SELECTOR;
2776                 else /* UAC2/3_SELECTOR_UNIT */
2777                         cval->control = UAC2_SU_SELECTOR;
2778                 break;
2779         }
2780
2781         namelist = kcalloc(desc->bNrInPins, sizeof(char *), GFP_KERNEL);
2782         if (!namelist) {
2783                 err = -ENOMEM;
2784                 goto error_cval;
2785         }
2786 #define MAX_ITEM_NAME_LEN       64
2787         for (i = 0; i < desc->bNrInPins; i++) {
2788                 struct usb_audio_term iterm;
2789                 namelist[i] = kmalloc(MAX_ITEM_NAME_LEN, GFP_KERNEL);
2790                 if (!namelist[i]) {
2791                         err = -ENOMEM;
2792                         goto error_name;
2793                 }
2794                 len = check_mapped_selector_name(state, unitid, i, namelist[i],
2795                                                  MAX_ITEM_NAME_LEN);
2796                 if (! len && check_input_term(state, desc->baSourceID[i], &iterm) >= 0)
2797                         len = get_term_name(state->chip, &iterm, namelist[i],
2798                                             MAX_ITEM_NAME_LEN, 0);
2799                 if (! len)
2800                         sprintf(namelist[i], "Input %u", i);
2801         }
2802
2803         kctl = snd_ctl_new1(&mixer_selectunit_ctl, cval);
2804         if (! kctl) {
2805                 usb_audio_err(state->chip, "cannot malloc kcontrol\n");
2806                 err = -ENOMEM;
2807                 goto error_name;
2808         }
2809         kctl->private_value = (unsigned long)namelist;
2810         kctl->private_free = usb_mixer_selector_elem_free;
2811
2812         /* check the static mapping table at first */
2813         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
2814         if (!len) {
2815                 /* no mapping ? */
2816                 switch (state->mixer->protocol) {
2817                 case UAC_VERSION_1:
2818                 case UAC_VERSION_2:
2819                 default:
2820                 /* if iSelector is given, use it */
2821                         nameid = uac_selector_unit_iSelector(desc);
2822                         if (nameid)
2823                                 len = snd_usb_copy_string_desc(state->chip,
2824                                                         nameid, kctl->id.name,
2825                                                         sizeof(kctl->id.name));
2826                         break;
2827                 case UAC_VERSION_3:
2828                         /* TODO: Class-Specific strings not yet supported */
2829                         break;
2830                 }
2831
2832                 /* ... or pick up the terminal name at next */
2833                 if (!len)
2834                         len = get_term_name(state->chip, &state->oterm,
2835                                     kctl->id.name, sizeof(kctl->id.name), 0);
2836                 /* ... or use the fixed string "USB" as the last resort */
2837                 if (!len)
2838                         strscpy(kctl->id.name, "USB", sizeof(kctl->id.name));
2839
2840                 /* and add the proper suffix */
2841                 if (desc->bDescriptorSubtype == UAC2_CLOCK_SELECTOR ||
2842                     desc->bDescriptorSubtype == UAC3_CLOCK_SELECTOR)
2843                         append_ctl_name(kctl, " Clock Source");
2844                 else if ((state->oterm.type & 0xff00) == 0x0100)
2845                         append_ctl_name(kctl, " Capture Source");
2846                 else
2847                         append_ctl_name(kctl, " Playback Source");
2848         }
2849
2850         usb_audio_dbg(state->chip, "[%d] SU [%s] items = %d\n",
2851                     cval->head.id, kctl->id.name, desc->bNrInPins);
2852         return snd_usb_mixer_add_control(&cval->head, kctl);
2853
2854  error_name:
2855         for (i = 0; i < desc->bNrInPins; i++)
2856                 kfree(namelist[i]);
2857         kfree(namelist);
2858  error_cval:
2859         usb_mixer_elem_info_free(cval);
2860         return err;
2861 }
2862
2863 /*
2864  * parse an audio unit recursively
2865  */
2866
2867 static int parse_audio_unit(struct mixer_build *state, int unitid)
2868 {
2869         unsigned char *p1;
2870         int protocol = state->mixer->protocol;
2871
2872         if (test_and_set_bit(unitid, state->unitbitmap))
2873                 return 0; /* the unit already visited */
2874
2875         p1 = find_audio_control_unit(state, unitid);
2876         if (!p1) {
2877                 usb_audio_err(state->chip, "unit %d not found!\n", unitid);
2878                 return -EINVAL;
2879         }
2880
2881         if (!snd_usb_validate_audio_desc(p1, protocol)) {
2882                 usb_audio_dbg(state->chip, "invalid unit %d\n", unitid);
2883                 return 0; /* skip invalid unit */
2884         }
2885
2886         switch (PTYPE(protocol, p1[2])) {
2887         case PTYPE(UAC_VERSION_1, UAC_INPUT_TERMINAL):
2888         case PTYPE(UAC_VERSION_2, UAC_INPUT_TERMINAL):
2889         case PTYPE(UAC_VERSION_3, UAC_INPUT_TERMINAL):
2890                 return parse_audio_input_terminal(state, unitid, p1);
2891         case PTYPE(UAC_VERSION_1, UAC_MIXER_UNIT):
2892         case PTYPE(UAC_VERSION_2, UAC_MIXER_UNIT):
2893         case PTYPE(UAC_VERSION_3, UAC3_MIXER_UNIT):
2894                 return parse_audio_mixer_unit(state, unitid, p1);
2895         case PTYPE(UAC_VERSION_2, UAC2_CLOCK_SOURCE):
2896         case PTYPE(UAC_VERSION_3, UAC3_CLOCK_SOURCE):
2897                 return parse_clock_source_unit(state, unitid, p1);
2898         case PTYPE(UAC_VERSION_1, UAC_SELECTOR_UNIT):
2899         case PTYPE(UAC_VERSION_2, UAC_SELECTOR_UNIT):
2900         case PTYPE(UAC_VERSION_3, UAC3_SELECTOR_UNIT):
2901         case PTYPE(UAC_VERSION_2, UAC2_CLOCK_SELECTOR):
2902         case PTYPE(UAC_VERSION_3, UAC3_CLOCK_SELECTOR):
2903                 return parse_audio_selector_unit(state, unitid, p1);
2904         case PTYPE(UAC_VERSION_1, UAC_FEATURE_UNIT):
2905         case PTYPE(UAC_VERSION_2, UAC_FEATURE_UNIT):
2906         case PTYPE(UAC_VERSION_3, UAC3_FEATURE_UNIT):
2907                 return parse_audio_feature_unit(state, unitid, p1);
2908         case PTYPE(UAC_VERSION_1, UAC1_PROCESSING_UNIT):
2909         case PTYPE(UAC_VERSION_2, UAC2_PROCESSING_UNIT_V2):
2910         case PTYPE(UAC_VERSION_3, UAC3_PROCESSING_UNIT):
2911                 return parse_audio_processing_unit(state, unitid, p1);
2912         case PTYPE(UAC_VERSION_1, UAC1_EXTENSION_UNIT):
2913         case PTYPE(UAC_VERSION_2, UAC2_EXTENSION_UNIT_V2):
2914         case PTYPE(UAC_VERSION_3, UAC3_EXTENSION_UNIT):
2915                 return parse_audio_extension_unit(state, unitid, p1);
2916         case PTYPE(UAC_VERSION_2, UAC2_EFFECT_UNIT):
2917         case PTYPE(UAC_VERSION_3, UAC3_EFFECT_UNIT):
2918                 return 0; /* FIXME - effect units not implemented yet */
2919         default:
2920                 usb_audio_err(state->chip,
2921                               "unit %u: unexpected type 0x%02x\n",
2922                               unitid, p1[2]);
2923                 return -EINVAL;
2924         }
2925 }
2926
2927 static void snd_usb_mixer_free(struct usb_mixer_interface *mixer)
2928 {
2929         /* kill pending URBs */
2930         snd_usb_mixer_disconnect(mixer);
2931
2932         kfree(mixer->id_elems);
2933         if (mixer->urb) {
2934                 kfree(mixer->urb->transfer_buffer);
2935                 usb_free_urb(mixer->urb);
2936         }
2937         usb_free_urb(mixer->rc_urb);
2938         kfree(mixer->rc_setup_packet);
2939         kfree(mixer);
2940 }
2941
2942 static int snd_usb_mixer_dev_free(struct snd_device *device)
2943 {
2944         struct usb_mixer_interface *mixer = device->device_data;
2945         snd_usb_mixer_free(mixer);
2946         return 0;
2947 }
2948
2949 /* UAC3 predefined channels configuration */
2950 struct uac3_badd_profile {
2951         int subclass;
2952         const char *name;
2953         int c_chmask;   /* capture channels mask */
2954         int p_chmask;   /* playback channels mask */
2955         int st_chmask;  /* side tone mixing channel mask */
2956 };
2957
2958 static const struct uac3_badd_profile uac3_badd_profiles[] = {
2959         {
2960                 /*
2961                  * BAIF, BAOF or combination of both
2962                  * IN: Mono or Stereo cfg, Mono alt possible
2963                  * OUT: Mono or Stereo cfg, Mono alt possible
2964                  */
2965                 .subclass = UAC3_FUNCTION_SUBCLASS_GENERIC_IO,
2966                 .name = "GENERIC IO",
2967                 .c_chmask = -1,         /* dynamic channels */
2968                 .p_chmask = -1,         /* dynamic channels */
2969         },
2970         {
2971                 /* BAOF; Stereo only cfg, Mono alt possible */
2972                 .subclass = UAC3_FUNCTION_SUBCLASS_HEADPHONE,
2973                 .name = "HEADPHONE",
2974                 .p_chmask = 3,
2975         },
2976         {
2977                 /* BAOF; Mono or Stereo cfg, Mono alt possible */
2978                 .subclass = UAC3_FUNCTION_SUBCLASS_SPEAKER,
2979                 .name = "SPEAKER",
2980                 .p_chmask = -1,         /* dynamic channels */
2981         },
2982         {
2983                 /* BAIF; Mono or Stereo cfg, Mono alt possible */
2984                 .subclass = UAC3_FUNCTION_SUBCLASS_MICROPHONE,
2985                 .name = "MICROPHONE",
2986                 .c_chmask = -1,         /* dynamic channels */
2987         },
2988         {
2989                 /*
2990                  * BAIOF topology
2991                  * IN: Mono only
2992                  * OUT: Mono or Stereo cfg, Mono alt possible
2993                  */
2994                 .subclass = UAC3_FUNCTION_SUBCLASS_HEADSET,
2995                 .name = "HEADSET",
2996                 .c_chmask = 1,
2997                 .p_chmask = -1,         /* dynamic channels */
2998                 .st_chmask = 1,
2999         },
3000         {
3001                 /* BAIOF; IN: Mono only; OUT: Stereo only, Mono alt possible */
3002                 .subclass = UAC3_FUNCTION_SUBCLASS_HEADSET_ADAPTER,
3003                 .name = "HEADSET ADAPTER",
3004                 .c_chmask = 1,
3005                 .p_chmask = 3,
3006                 .st_chmask = 1,
3007         },
3008         {
3009                 /* BAIF + BAOF; IN: Mono only; OUT: Mono only */
3010                 .subclass = UAC3_FUNCTION_SUBCLASS_SPEAKERPHONE,
3011                 .name = "SPEAKERPHONE",
3012                 .c_chmask = 1,
3013                 .p_chmask = 1,
3014         },
3015         { 0 } /* terminator */
3016 };
3017
3018 static bool uac3_badd_func_has_valid_channels(struct usb_mixer_interface *mixer,
3019                                               const struct uac3_badd_profile *f,
3020                                               int c_chmask, int p_chmask)
3021 {
3022         /*
3023          * If both playback/capture channels are dynamic, make sure
3024          * at least one channel is present
3025          */
3026         if (f->c_chmask < 0 && f->p_chmask < 0) {
3027                 if (!c_chmask && !p_chmask) {
3028                         usb_audio_warn(mixer->chip, "BAAD %s: no channels?",
3029                                        f->name);
3030                         return false;
3031                 }
3032                 return true;
3033         }
3034
3035         if ((f->c_chmask < 0 && !c_chmask) ||
3036             (f->c_chmask >= 0 && f->c_chmask != c_chmask)) {
3037                 usb_audio_warn(mixer->chip, "BAAD %s c_chmask mismatch",
3038                                f->name);
3039                 return false;
3040         }
3041         if ((f->p_chmask < 0 && !p_chmask) ||
3042             (f->p_chmask >= 0 && f->p_chmask != p_chmask)) {
3043                 usb_audio_warn(mixer->chip, "BAAD %s p_chmask mismatch",
3044                                f->name);
3045                 return false;
3046         }
3047         return true;
3048 }
3049
3050 /*
3051  * create mixer controls for UAC3 BADD profiles
3052  *
3053  * UAC3 BADD device doesn't contain CS descriptors thus we will guess everything
3054  *
3055  * BADD device may contain Mixer Unit, which doesn't have any controls, skip it
3056  */
3057 static int snd_usb_mixer_controls_badd(struct usb_mixer_interface *mixer,
3058                                        int ctrlif)
3059 {
3060         struct usb_device *dev = mixer->chip->dev;
3061         struct usb_interface_assoc_descriptor *assoc;
3062         int badd_profile = mixer->chip->badd_profile;
3063         const struct uac3_badd_profile *f;
3064         const struct usbmix_ctl_map *map;
3065         int p_chmask = 0, c_chmask = 0, st_chmask = 0;
3066         int i;
3067
3068         assoc = usb_ifnum_to_if(dev, ctrlif)->intf_assoc;
3069
3070         /* Detect BADD capture/playback channels from AS EP descriptors */
3071         for (i = 0; i < assoc->bInterfaceCount; i++) {
3072                 int intf = assoc->bFirstInterface + i;
3073
3074                 struct usb_interface *iface;
3075                 struct usb_host_interface *alts;
3076                 struct usb_interface_descriptor *altsd;
3077                 unsigned int maxpacksize;
3078                 char dir_in;
3079                 int chmask, num;
3080
3081                 if (intf == ctrlif)
3082                         continue;
3083
3084                 iface = usb_ifnum_to_if(dev, intf);
3085                 if (!iface)
3086                         continue;
3087
3088                 num = iface->num_altsetting;
3089
3090                 if (num < 2)
3091                         return -EINVAL;
3092
3093                 /*
3094                  * The number of Channels in an AudioStreaming interface
3095                  * and the audio sample bit resolution (16 bits or 24
3096                  * bits) can be derived from the wMaxPacketSize field in
3097                  * the Standard AS Audio Data Endpoint descriptor in
3098                  * Alternate Setting 1
3099                  */
3100                 alts = &iface->altsetting[1];
3101                 altsd = get_iface_desc(alts);
3102
3103                 if (altsd->bNumEndpoints < 1)
3104                         return -EINVAL;
3105
3106                 /* check direction */
3107                 dir_in = (get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN);
3108                 maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
3109
3110                 switch (maxpacksize) {
3111                 default:
3112                         usb_audio_err(mixer->chip,
3113                                 "incorrect wMaxPacketSize 0x%x for BADD profile\n",
3114                                 maxpacksize);
3115                         return -EINVAL;
3116                 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_16:
3117                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_16:
3118                 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_24:
3119                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_24:
3120                         chmask = 1;
3121                         break;
3122                 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_16:
3123                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_16:
3124                 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_24:
3125                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_24:
3126                         chmask = 3;
3127                         break;
3128                 }
3129
3130                 if (dir_in)
3131                         c_chmask = chmask;
3132                 else
3133                         p_chmask = chmask;
3134         }
3135
3136         usb_audio_dbg(mixer->chip,
3137                 "UAC3 BADD profile 0x%x: detected c_chmask=%d p_chmask=%d\n",
3138                 badd_profile, c_chmask, p_chmask);
3139
3140         /* check the mapping table */
3141         for (map = uac3_badd_usbmix_ctl_maps; map->id; map++) {
3142                 if (map->id == badd_profile)
3143                         break;
3144         }
3145
3146         if (!map->id)
3147                 return -EINVAL;
3148
3149         for (f = uac3_badd_profiles; f->name; f++) {
3150                 if (badd_profile == f->subclass)
3151                         break;
3152         }
3153         if (!f->name)
3154                 return -EINVAL;
3155         if (!uac3_badd_func_has_valid_channels(mixer, f, c_chmask, p_chmask))
3156                 return -EINVAL;
3157         st_chmask = f->st_chmask;
3158
3159         /* Playback */
3160         if (p_chmask) {
3161                 /* Master channel, always writable */
3162                 build_feature_ctl_badd(mixer, 0, UAC_FU_MUTE,
3163                                        UAC3_BADD_FU_ID2, map->map);
3164                 /* Mono/Stereo volume channels, always writable */
3165                 build_feature_ctl_badd(mixer, p_chmask, UAC_FU_VOLUME,
3166                                        UAC3_BADD_FU_ID2, map->map);
3167         }
3168
3169         /* Capture */
3170         if (c_chmask) {
3171                 /* Master channel, always writable */
3172                 build_feature_ctl_badd(mixer, 0, UAC_FU_MUTE,
3173                                        UAC3_BADD_FU_ID5, map->map);
3174                 /* Mono/Stereo volume channels, always writable */
3175                 build_feature_ctl_badd(mixer, c_chmask, UAC_FU_VOLUME,
3176                                        UAC3_BADD_FU_ID5, map->map);
3177         }
3178
3179         /* Side tone-mixing */
3180         if (st_chmask) {
3181                 /* Master channel, always writable */
3182                 build_feature_ctl_badd(mixer, 0, UAC_FU_MUTE,
3183                                        UAC3_BADD_FU_ID7, map->map);
3184                 /* Mono volume channel, always writable */
3185                 build_feature_ctl_badd(mixer, 1, UAC_FU_VOLUME,
3186                                        UAC3_BADD_FU_ID7, map->map);
3187         }
3188
3189         /* Insertion Control */
3190         if (f->subclass == UAC3_FUNCTION_SUBCLASS_HEADSET_ADAPTER) {
3191                 struct usb_audio_term iterm, oterm;
3192
3193                 /* Input Term - Insertion control */
3194                 memset(&iterm, 0, sizeof(iterm));
3195                 iterm.id = UAC3_BADD_IT_ID4;
3196                 iterm.type = UAC_BIDIR_TERMINAL_HEADSET;
3197                 build_connector_control(mixer, map->map, &iterm, true);
3198
3199                 /* Output Term - Insertion control */
3200                 memset(&oterm, 0, sizeof(oterm));
3201                 oterm.id = UAC3_BADD_OT_ID3;
3202                 oterm.type = UAC_BIDIR_TERMINAL_HEADSET;
3203                 build_connector_control(mixer, map->map, &oterm, false);
3204         }
3205
3206         return 0;
3207 }
3208
3209 /*
3210  * create mixer controls
3211  *
3212  * walk through all UAC_OUTPUT_TERMINAL descriptors to search for mixers
3213  */
3214 static int snd_usb_mixer_controls(struct usb_mixer_interface *mixer)
3215 {
3216         struct mixer_build state;
3217         int err;
3218         const struct usbmix_ctl_map *map;
3219         void *p;
3220
3221         memset(&state, 0, sizeof(state));
3222         state.chip = mixer->chip;
3223         state.mixer = mixer;
3224         state.buffer = mixer->hostif->extra;
3225         state.buflen = mixer->hostif->extralen;
3226
3227         /* check the mapping table */
3228         for (map = usbmix_ctl_maps; map->id; map++) {
3229                 if (map->id == state.chip->usb_id) {
3230                         state.map = map->map;
3231                         state.selector_map = map->selector_map;
3232                         mixer->connector_map = map->connector_map;
3233                         break;
3234                 }
3235         }
3236
3237         p = NULL;
3238         while ((p = snd_usb_find_csint_desc(mixer->hostif->extra,
3239                                             mixer->hostif->extralen,
3240                                             p, UAC_OUTPUT_TERMINAL)) != NULL) {
3241                 if (!snd_usb_validate_audio_desc(p, mixer->protocol))
3242                         continue; /* skip invalid descriptor */
3243
3244                 if (mixer->protocol == UAC_VERSION_1) {
3245                         struct uac1_output_terminal_descriptor *desc = p;
3246
3247                         /* mark terminal ID as visited */
3248                         set_bit(desc->bTerminalID, state.unitbitmap);
3249                         state.oterm.id = desc->bTerminalID;
3250                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
3251                         state.oterm.name = desc->iTerminal;
3252                         err = parse_audio_unit(&state, desc->bSourceID);
3253                         if (err < 0 && err != -EINVAL)
3254                                 return err;
3255                 } else if (mixer->protocol == UAC_VERSION_2) {
3256                         struct uac2_output_terminal_descriptor *desc = p;
3257
3258                         /* mark terminal ID as visited */
3259                         set_bit(desc->bTerminalID, state.unitbitmap);
3260                         state.oterm.id = desc->bTerminalID;
3261                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
3262                         state.oterm.name = desc->iTerminal;
3263                         err = parse_audio_unit(&state, desc->bSourceID);
3264                         if (err < 0 && err != -EINVAL)
3265                                 return err;
3266
3267                         /*
3268                          * For UAC2, use the same approach to also add the
3269                          * clock selectors
3270                          */
3271                         err = parse_audio_unit(&state, desc->bCSourceID);
3272                         if (err < 0 && err != -EINVAL)
3273                                 return err;
3274
3275                         if ((state.oterm.type & 0xff00) != 0x0100 &&
3276                             uac_v2v3_control_is_readable(le16_to_cpu(desc->bmControls),
3277                                                          UAC2_TE_CONNECTOR)) {
3278                                 build_connector_control(state.mixer, state.map,
3279                                                         &state.oterm, false);
3280                         }
3281                 } else {  /* UAC_VERSION_3 */
3282                         struct uac3_output_terminal_descriptor *desc = p;
3283
3284                         /* mark terminal ID as visited */
3285                         set_bit(desc->bTerminalID, state.unitbitmap);
3286                         state.oterm.id = desc->bTerminalID;
3287                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
3288                         state.oterm.name = le16_to_cpu(desc->wTerminalDescrStr);
3289                         err = parse_audio_unit(&state, desc->bSourceID);
3290                         if (err < 0 && err != -EINVAL)
3291                                 return err;
3292
3293                         /*
3294                          * For UAC3, use the same approach to also add the
3295                          * clock selectors
3296                          */
3297                         err = parse_audio_unit(&state, desc->bCSourceID);
3298                         if (err < 0 && err != -EINVAL)
3299                                 return err;
3300
3301                         if ((state.oterm.type & 0xff00) != 0x0100 &&
3302                             uac_v2v3_control_is_readable(le32_to_cpu(desc->bmControls),
3303                                                          UAC3_TE_INSERTION)) {
3304                                 build_connector_control(state.mixer, state.map,
3305                                                         &state.oterm, false);
3306                         }
3307                 }
3308         }
3309
3310         return 0;
3311 }
3312
3313 static int delegate_notify(struct usb_mixer_interface *mixer, int unitid,
3314                            u8 *control, u8 *channel)
3315 {
3316         const struct usbmix_connector_map *map = mixer->connector_map;
3317
3318         if (!map)
3319                 return unitid;
3320
3321         for (; map->id; map++) {
3322                 if (map->id == unitid) {
3323                         if (control && map->control)
3324                                 *control = map->control;
3325                         if (channel && map->channel)
3326                                 *channel = map->channel;
3327                         return map->delegated_id;
3328                 }
3329         }
3330         return unitid;
3331 }
3332
3333 void snd_usb_mixer_notify_id(struct usb_mixer_interface *mixer, int unitid)
3334 {
3335         struct usb_mixer_elem_list *list;
3336
3337         unitid = delegate_notify(mixer, unitid, NULL, NULL);
3338
3339         for_each_mixer_elem(list, mixer, unitid) {
3340                 struct usb_mixer_elem_info *info;
3341
3342                 if (!list->is_std_info)
3343                         continue;
3344                 info = mixer_elem_list_to_info(list);
3345                 /* invalidate cache, so the value is read from the device */
3346                 info->cached = 0;
3347                 snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
3348                                &list->kctl->id);
3349         }
3350 }
3351
3352 static void snd_usb_mixer_dump_cval(struct snd_info_buffer *buffer,
3353                                     struct usb_mixer_elem_list *list)
3354 {
3355         struct usb_mixer_elem_info *cval = mixer_elem_list_to_info(list);
3356         static const char * const val_types[] = {
3357                 [USB_MIXER_BOOLEAN] = "BOOLEAN",
3358                 [USB_MIXER_INV_BOOLEAN] = "INV_BOOLEAN",
3359                 [USB_MIXER_S8] = "S8",
3360                 [USB_MIXER_U8] = "U8",
3361                 [USB_MIXER_S16] = "S16",
3362                 [USB_MIXER_U16] = "U16",
3363                 [USB_MIXER_S32] = "S32",
3364                 [USB_MIXER_U32] = "U32",
3365                 [USB_MIXER_BESPOKEN] = "BESPOKEN",
3366         };
3367         snd_iprintf(buffer, "    Info: id=%i, control=%i, cmask=0x%x, "
3368                             "channels=%i, type=\"%s\"\n", cval->head.id,
3369                             cval->control, cval->cmask, cval->channels,
3370                             val_types[cval->val_type]);
3371         snd_iprintf(buffer, "    Volume: min=%i, max=%i, dBmin=%i, dBmax=%i\n",
3372                             cval->min, cval->max, cval->dBmin, cval->dBmax);
3373 }
3374
3375 static void snd_usb_mixer_proc_read(struct snd_info_entry *entry,
3376                                     struct snd_info_buffer *buffer)
3377 {
3378         struct snd_usb_audio *chip = entry->private_data;
3379         struct usb_mixer_interface *mixer;
3380         struct usb_mixer_elem_list *list;
3381         int unitid;
3382
3383         list_for_each_entry(mixer, &chip->mixer_list, list) {
3384                 snd_iprintf(buffer,
3385                         "USB Mixer: usb_id=0x%08x, ctrlif=%i, ctlerr=%i\n",
3386                                 chip->usb_id, mixer_ctrl_intf(mixer),
3387                                 mixer->ignore_ctl_error);
3388                 snd_iprintf(buffer, "Card: %s\n", chip->card->longname);
3389                 for (unitid = 0; unitid < MAX_ID_ELEMS; unitid++) {
3390                         for_each_mixer_elem(list, mixer, unitid) {
3391                                 snd_iprintf(buffer, "  Unit: %i\n", list->id);
3392                                 if (list->kctl)
3393                                         snd_iprintf(buffer,
3394                                                     "    Control: name=\"%s\", index=%i\n",
3395                                                     list->kctl->id.name,
3396                                                     list->kctl->id.index);
3397                                 if (list->dump)
3398                                         list->dump(buffer, list);
3399                         }
3400                 }
3401         }
3402 }
3403
3404 static void snd_usb_mixer_interrupt_v2(struct usb_mixer_interface *mixer,
3405                                        int attribute, int value, int index)
3406 {
3407         struct usb_mixer_elem_list *list;
3408         __u8 unitid = (index >> 8) & 0xff;
3409         __u8 control = (value >> 8) & 0xff;
3410         __u8 channel = value & 0xff;
3411         unsigned int count = 0;
3412
3413         if (channel >= MAX_CHANNELS) {
3414                 usb_audio_dbg(mixer->chip,
3415                         "%s(): bogus channel number %d\n",
3416                         __func__, channel);
3417                 return;
3418         }
3419
3420         unitid = delegate_notify(mixer, unitid, &control, &channel);
3421
3422         for_each_mixer_elem(list, mixer, unitid)
3423                 count++;
3424
3425         if (count == 0)
3426                 return;
3427
3428         for_each_mixer_elem(list, mixer, unitid) {
3429                 struct usb_mixer_elem_info *info;
3430
3431                 if (!list->kctl)
3432                         continue;
3433                 if (!list->is_std_info)
3434                         continue;
3435
3436                 info = mixer_elem_list_to_info(list);
3437                 if (count > 1 && info->control != control)
3438                         continue;
3439
3440                 switch (attribute) {
3441                 case UAC2_CS_CUR:
3442                         /* invalidate cache, so the value is read from the device */
3443                         if (channel)
3444                                 info->cached &= ~(1 << channel);
3445                         else /* master channel */
3446                                 info->cached = 0;
3447
3448                         snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
3449                                        &info->head.kctl->id);
3450                         break;
3451
3452                 case UAC2_CS_RANGE:
3453                         /* TODO */
3454                         break;
3455
3456                 case UAC2_CS_MEM:
3457                         /* TODO */
3458                         break;
3459
3460                 default:
3461                         usb_audio_dbg(mixer->chip,
3462                                 "unknown attribute %d in interrupt\n",
3463                                 attribute);
3464                         break;
3465                 } /* switch */
3466         }
3467 }
3468
3469 static void snd_usb_mixer_interrupt(struct urb *urb)
3470 {
3471         struct usb_mixer_interface *mixer = urb->context;
3472         int len = urb->actual_length;
3473         int ustatus = urb->status;
3474
3475         if (ustatus != 0)
3476                 goto requeue;
3477
3478         if (mixer->protocol == UAC_VERSION_1) {
3479                 struct uac1_status_word *status;
3480
3481                 for (status = urb->transfer_buffer;
3482                      len >= sizeof(*status);
3483                      len -= sizeof(*status), status++) {
3484                         dev_dbg(&urb->dev->dev, "status interrupt: %02x %02x\n",
3485                                                 status->bStatusType,
3486                                                 status->bOriginator);
3487
3488                         /* ignore any notifications not from the control interface */
3489                         if ((status->bStatusType & UAC1_STATUS_TYPE_ORIG_MASK) !=
3490                                 UAC1_STATUS_TYPE_ORIG_AUDIO_CONTROL_IF)
3491                                 continue;
3492
3493                         if (status->bStatusType & UAC1_STATUS_TYPE_MEM_CHANGED)
3494                                 snd_usb_mixer_rc_memory_change(mixer, status->bOriginator);
3495                         else
3496                                 snd_usb_mixer_notify_id(mixer, status->bOriginator);
3497                 }
3498         } else { /* UAC_VERSION_2 */
3499                 struct uac2_interrupt_data_msg *msg;
3500
3501                 for (msg = urb->transfer_buffer;
3502                      len >= sizeof(*msg);
3503                      len -= sizeof(*msg), msg++) {
3504                         /* drop vendor specific and endpoint requests */
3505                         if ((msg->bInfo & UAC2_INTERRUPT_DATA_MSG_VENDOR) ||
3506                             (msg->bInfo & UAC2_INTERRUPT_DATA_MSG_EP))
3507                                 continue;
3508
3509                         snd_usb_mixer_interrupt_v2(mixer, msg->bAttribute,
3510                                                    le16_to_cpu(msg->wValue),
3511                                                    le16_to_cpu(msg->wIndex));
3512                 }
3513         }
3514
3515 requeue:
3516         if (ustatus != -ENOENT &&
3517             ustatus != -ECONNRESET &&
3518             ustatus != -ESHUTDOWN) {
3519                 urb->dev = mixer->chip->dev;
3520                 usb_submit_urb(urb, GFP_ATOMIC);
3521         }
3522 }
3523
3524 /* create the handler for the optional status interrupt endpoint */
3525 static int snd_usb_mixer_status_create(struct usb_mixer_interface *mixer)
3526 {
3527         struct usb_endpoint_descriptor *ep;
3528         void *transfer_buffer;
3529         int buffer_length;
3530         unsigned int epnum;
3531
3532         /* we need one interrupt input endpoint */
3533         if (get_iface_desc(mixer->hostif)->bNumEndpoints < 1)
3534                 return 0;
3535         ep = get_endpoint(mixer->hostif, 0);
3536         if (!usb_endpoint_dir_in(ep) || !usb_endpoint_xfer_int(ep))
3537                 return 0;
3538
3539         epnum = usb_endpoint_num(ep);
3540         buffer_length = le16_to_cpu(ep->wMaxPacketSize);
3541         transfer_buffer = kmalloc(buffer_length, GFP_KERNEL);
3542         if (!transfer_buffer)
3543                 return -ENOMEM;
3544         mixer->urb = usb_alloc_urb(0, GFP_KERNEL);
3545         if (!mixer->urb) {
3546                 kfree(transfer_buffer);
3547                 return -ENOMEM;
3548         }
3549         usb_fill_int_urb(mixer->urb, mixer->chip->dev,
3550                          usb_rcvintpipe(mixer->chip->dev, epnum),
3551                          transfer_buffer, buffer_length,
3552                          snd_usb_mixer_interrupt, mixer, ep->bInterval);
3553         usb_submit_urb(mixer->urb, GFP_KERNEL);
3554         return 0;
3555 }
3556
3557 int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif)
3558 {
3559         static const struct snd_device_ops dev_ops = {
3560                 .dev_free = snd_usb_mixer_dev_free
3561         };
3562         struct usb_mixer_interface *mixer;
3563         int err;
3564
3565         strcpy(chip->card->mixername, "USB Mixer");
3566
3567         mixer = kzalloc(sizeof(*mixer), GFP_KERNEL);
3568         if (!mixer)
3569                 return -ENOMEM;
3570         mixer->chip = chip;
3571         mixer->ignore_ctl_error = !!(chip->quirk_flags & QUIRK_FLAG_IGNORE_CTL_ERROR);
3572         mixer->id_elems = kcalloc(MAX_ID_ELEMS, sizeof(*mixer->id_elems),
3573                                   GFP_KERNEL);
3574         if (!mixer->id_elems) {
3575                 kfree(mixer);
3576                 return -ENOMEM;
3577         }
3578
3579         mixer->hostif = &usb_ifnum_to_if(chip->dev, ctrlif)->altsetting[0];
3580         switch (get_iface_desc(mixer->hostif)->bInterfaceProtocol) {
3581         case UAC_VERSION_1:
3582         default:
3583                 mixer->protocol = UAC_VERSION_1;
3584                 break;
3585         case UAC_VERSION_2:
3586                 mixer->protocol = UAC_VERSION_2;
3587                 break;
3588         case UAC_VERSION_3:
3589                 mixer->protocol = UAC_VERSION_3;
3590                 break;
3591         }
3592
3593         if (mixer->protocol == UAC_VERSION_3 &&
3594                         chip->badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) {
3595                 err = snd_usb_mixer_controls_badd(mixer, ctrlif);
3596                 if (err < 0)
3597                         goto _error;
3598         } else {
3599                 err = snd_usb_mixer_controls(mixer);
3600                 if (err < 0)
3601                         goto _error;
3602         }
3603
3604         err = snd_usb_mixer_status_create(mixer);
3605         if (err < 0)
3606                 goto _error;
3607
3608         err = snd_usb_mixer_apply_create_quirk(mixer);
3609         if (err < 0)
3610                 goto _error;
3611
3612         err = snd_device_new(chip->card, SNDRV_DEV_CODEC, mixer, &dev_ops);
3613         if (err < 0)
3614                 goto _error;
3615
3616         if (list_empty(&chip->mixer_list))
3617                 snd_card_ro_proc_new(chip->card, "usbmixer", chip,
3618                                      snd_usb_mixer_proc_read);
3619
3620         list_add(&mixer->list, &chip->mixer_list);
3621         return 0;
3622
3623 _error:
3624         snd_usb_mixer_free(mixer);
3625         return err;
3626 }
3627
3628 void snd_usb_mixer_disconnect(struct usb_mixer_interface *mixer)
3629 {
3630         if (mixer->disconnected)
3631                 return;
3632         if (mixer->urb)
3633                 usb_kill_urb(mixer->urb);
3634         if (mixer->rc_urb)
3635                 usb_kill_urb(mixer->rc_urb);
3636         if (mixer->private_free)
3637                 mixer->private_free(mixer);
3638         mixer->disconnected = true;
3639 }
3640
3641 /* stop any bus activity of a mixer */
3642 static void snd_usb_mixer_inactivate(struct usb_mixer_interface *mixer)
3643 {
3644         usb_kill_urb(mixer->urb);
3645         usb_kill_urb(mixer->rc_urb);
3646 }
3647
3648 static int snd_usb_mixer_activate(struct usb_mixer_interface *mixer)
3649 {
3650         int err;
3651
3652         if (mixer->urb) {
3653                 err = usb_submit_urb(mixer->urb, GFP_NOIO);
3654                 if (err < 0)
3655                         return err;
3656         }
3657
3658         return 0;
3659 }
3660
3661 int snd_usb_mixer_suspend(struct usb_mixer_interface *mixer)
3662 {
3663         snd_usb_mixer_inactivate(mixer);
3664         if (mixer->private_suspend)
3665                 mixer->private_suspend(mixer);
3666         return 0;
3667 }
3668
3669 static int restore_mixer_value(struct usb_mixer_elem_list *list)
3670 {
3671         struct usb_mixer_elem_info *cval = mixer_elem_list_to_info(list);
3672         int c, err, idx;
3673
3674         if (cval->val_type == USB_MIXER_BESPOKEN)
3675                 return 0;
3676
3677         if (cval->cmask) {
3678                 idx = 0;
3679                 for (c = 0; c < MAX_CHANNELS; c++) {
3680                         if (!(cval->cmask & (1 << c)))
3681                                 continue;
3682                         if (cval->cached & (1 << (c + 1))) {
3683                                 err = snd_usb_set_cur_mix_value(cval, c + 1, idx,
3684                                                         cval->cache_val[idx]);
3685                                 if (err < 0)
3686                                         break;
3687                         }
3688                         idx++;
3689                 }
3690         } else {
3691                 /* master */
3692                 if (cval->cached)
3693                         snd_usb_set_cur_mix_value(cval, 0, 0, *cval->cache_val);
3694         }
3695
3696         return 0;
3697 }
3698
3699 int snd_usb_mixer_resume(struct usb_mixer_interface *mixer)
3700 {
3701         struct usb_mixer_elem_list *list;
3702         int id, err;
3703
3704         /* restore cached mixer values */
3705         for (id = 0; id < MAX_ID_ELEMS; id++) {
3706                 for_each_mixer_elem(list, mixer, id) {
3707                         if (list->resume) {
3708                                 err = list->resume(list);
3709                                 if (err < 0)
3710                                         return err;
3711                         }
3712                 }
3713         }
3714
3715         snd_usb_mixer_resume_quirk(mixer);
3716
3717         return snd_usb_mixer_activate(mixer);
3718 }
3719
3720 void snd_usb_mixer_elem_init_std(struct usb_mixer_elem_list *list,
3721                                  struct usb_mixer_interface *mixer,
3722                                  int unitid)
3723 {
3724         list->mixer = mixer;
3725         list->id = unitid;
3726         list->dump = snd_usb_mixer_dump_cval;
3727         list->resume = restore_mixer_value;
3728 }