sound/usb/mixer.c

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