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