sound/usb/mixer.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *   (Tentative) USB Audio Driver for ALSA
   4  *
   5  *   Mixer control part
   6  *
   7  *   Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
   8  *
   9  *   Many codes borrowed from audio.c by
  10  *          Alan Cox (alan@lxorguk.ukuu.org.uk)
  11  *          Thomas Sailer (sailer@ife.ee.ethz.ch)
  12  */
  13
  14 /*
  15  * TODOs, for both the mixer and the streaming interfaces:
  16  *
  17  *  - support for UAC2 effect units
  18  *  - support for graphical equalizers
  19  *  - RANGE and MEM set commands (UAC2)
  20  *  - RANGE and MEM interrupt dispatchers (UAC2)
  21  *  - audio channel clustering (UAC2)
  22  *  - audio sample rate converter units (UAC2)
  23  *  - proper handling of clock multipliers (UAC2)
  24  *  - dispatch clock change notifications (UAC2)
  25  *      - stop PCM streams which use a clock that became invalid
  26  *      - stop PCM streams which use a clock selector that has changed
  27  *      - parse available sample rates again when clock sources changed
  28  */
  29
  30 #include <linux/bitops.h>
  31 #include <linux/init.h>
  32 #include <linux/list.h>
  33 #include <linux/log2.h>
  34 #include <linux/slab.h>
  35 #include <linux/string.h>
  36 #include <linux/usb.h>
  37 #include <linux/usb/audio.h>
  38 #include <linux/usb/audio-v2.h>
  39 #include <linux/usb/audio-v3.h>
  40
  41 #include <sound/core.h>
  42 #include <sound/control.h>
  43 #include <sound/hwdep.h>
  44 #include <sound/info.h>
  45 #include <sound/tlv.h>
  46
  47 #include "usbaudio.h"
  48 #include "mixer.h"
  49 #include "helper.h"
  50 #include "mixer_quirks.h"
  51 #include "power.h"
  52
  53 #define MAX_ID_ELEMS    256
  54
  55 struct usb_audio_term {
  56         int id;
  57         int type;
  58         int channels;
  59         unsigned int chconfig;
  60         int name;
  61 };
  62
  63 struct usbmix_name_map;
  64
  65 struct mixer_build {
  66         struct snd_usb_audio *chip;
  67         struct usb_mixer_interface *mixer;
  68         unsigned char *buffer;
  69         unsigned int buflen;
  70         DECLARE_BITMAP(unitbitmap, MAX_ID_ELEMS);
  71         DECLARE_BITMAP(termbitmap, MAX_ID_ELEMS);
  72         struct usb_audio_term oterm;
  73         const struct usbmix_name_map *map;
  74         const struct usbmix_selector_map *selector_map;
  75 };
  76
  77 /*E-mu 0202/0404/0204 eXtension Unit(XU) control*/
  78 enum {
  79         USB_XU_CLOCK_RATE               = 0xe301,
  80         USB_XU_CLOCK_SOURCE             = 0xe302,
  81         USB_XU_DIGITAL_IO_STATUS        = 0xe303,
  82         USB_XU_DEVICE_OPTIONS           = 0xe304,
  83         USB_XU_DIRECT_MONITORING        = 0xe305,
  84         USB_XU_METERING                 = 0xe306
  85 };
  86 enum {
  87         USB_XU_CLOCK_SOURCE_SELECTOR = 0x02,    /* clock source*/
  88         USB_XU_CLOCK_RATE_SELECTOR = 0x03,      /* clock rate */
  89         USB_XU_DIGITAL_FORMAT_SELECTOR = 0x01,  /* the spdif format */
  90         USB_XU_SOFT_LIMIT_SELECTOR = 0x03       /* soft limiter */
  91 };
  92
  93 /*
  94  * manual mapping of mixer names
  95  * if the mixer topology is too complicated and the parsed names are
  96  * ambiguous, add the entries in usbmixer_maps.c.
  97  */
  98 #include "mixer_maps.c"
  99
 100 static const struct usbmix_name_map *
 101 find_map(const struct usbmix_name_map *p, int unitid, int control)
 102 {
 103         if (!p)
 104                 return NULL;
 105
 106         for (; p->id; p++) {
 107                 if (p->id == unitid &&
 108                     (!control || !p->control || control == p->control))
 109                         return p;
 110         }
 111         return NULL;
 112 }
 113
 114 /* get the mapped name if the unit matches */
 115 static int
 116 check_mapped_name(const struct usbmix_name_map *p, char *buf, int buflen)
 117 {
 118         int len;
 119
 120         if (!p || !p->name)
 121                 return 0;
 122
 123         buflen--;
 124         len = strscpy(buf, p->name, buflen);
 125         return len < 0 ? buflen : len;
 126 }
 127
 128 /* ignore the error value if ignore_ctl_error flag is set */
 129 #define filter_error(cval, err) \
 130         ((cval)->head.mixer->ignore_ctl_error ? 0 : (err))
 131
 132 /* check whether the control should be ignored */
 133 static inline int
 134 check_ignored_ctl(const struct usbmix_name_map *p)
 135 {
 136         if (!p || p->name || p->dB)
 137                 return 0;
 138         return 1;
 139 }
 140
 141 /* dB mapping */
 142 static inline void check_mapped_dB(const struct usbmix_name_map *p,
 143                                    struct usb_mixer_elem_info *cval)
 144 {
 145         if (p && p->dB) {
 146                 cval->dBmin = p->dB->min;
 147                 cval->dBmax = p->dB->max;
 148                 cval->min_mute = p->dB->min_mute;
 149                 cval->initialized = 1;
 150         }
 151 }
 152
 153 /* get the mapped selector source name */
 154 static int check_mapped_selector_name(struct mixer_build *state, int unitid,
 155                                       int index, char *buf, int buflen)
 156 {
 157         const struct usbmix_selector_map *p;
 158         int len;
 159
 160         if (!state->selector_map)
 161                 return 0;
 162         for (p = state->selector_map; p->id; p++) {
 163                 if (p->id == unitid && index < p->count) {
 164                         len = strscpy(buf, p->names[index], buflen);
 165                         return len < 0 ? buflen : len;
 166                 }
 167         }
 168         return 0;
 169 }
 170
 171 /*
 172  * find an audio control unit with the given unit id
 173  */
 174 static void *find_audio_control_unit(struct mixer_build *state,
 175                                      unsigned char unit)
 176 {
 177         /* we just parse the header */
 178         struct uac_feature_unit_descriptor *hdr = NULL;
 179
 180         while ((hdr = snd_usb_find_desc(state->buffer, state->buflen, hdr,
 181                                         USB_DT_CS_INTERFACE)) != NULL) {
 182                 if (hdr->bLength >= 4 &&
 183                     hdr->bDescriptorSubtype >= UAC_INPUT_TERMINAL &&
 184                     hdr->bDescriptorSubtype <= UAC3_SAMPLE_RATE_CONVERTER &&
 185                     hdr->bUnitID == unit)
 186                         return hdr;
 187         }
 188
 189         return NULL;
 190 }
 191
 192 /*
 193  * copy a string with the given id
 194  */
 195 static int snd_usb_copy_string_desc(struct snd_usb_audio *chip,
 196                                     int index, char *buf, int maxlen)
 197 {
 198         int len = usb_string(chip->dev, index, buf, maxlen - 1);
 199
 200         if (len < 0)
 201                 return 0;
 202
 203         buf[len] = 0;
 204         return len;
 205 }
 206
 207 /*
 208  * convert from the byte/word on usb descriptor to the zero-based integer
 209  */
 210 static int convert_signed_value(struct usb_mixer_elem_info *cval, int val)
 211 {
 212         switch (cval->val_type) {
 213         case USB_MIXER_BOOLEAN:
 214                 return !!val;
 215         case USB_MIXER_INV_BOOLEAN:
 216                 return !val;
 217         case USB_MIXER_U8:
 218                 val &= 0xff;
 219                 break;
 220         case USB_MIXER_S8:
 221                 val &= 0xff;
 222                 if (val >= 0x80)
 223                         val -= 0x100;
 224                 break;
 225         case USB_MIXER_U16:
 226                 val &= 0xffff;
 227                 break;
 228         case USB_MIXER_S16:
 229                 val &= 0xffff;
 230                 if (val >= 0x8000)
 231                         val -= 0x10000;
 232                 break;
 233         }
 234         return val;
 235 }
 236
 237 /*
 238  * convert from the zero-based int to the byte/word for usb descriptor
 239  */
 240 static int convert_bytes_value(struct usb_mixer_elem_info *cval, int val)
 241 {
 242         switch (cval->val_type) {
 243         case USB_MIXER_BOOLEAN:
 244                 return !!val;
 245         case USB_MIXER_INV_BOOLEAN:
 246                 return !val;
 247         case USB_MIXER_S8:
 248         case USB_MIXER_U8:
 249                 return val & 0xff;
 250         case USB_MIXER_S16:
 251         case USB_MIXER_U16:
 252                 return val & 0xffff;
 253         }
 254         return 0; /* not reached */
 255 }
 256
 257 static int get_relative_value(struct usb_mixer_elem_info *cval, int val)
 258 {
 259         if (!cval->res)
 260                 cval->res = 1;
 261         if (val < cval->min)
 262                 return 0;
 263         else if (val >= cval->max)
 264                 return DIV_ROUND_UP(cval->max - cval->min, cval->res);
 265         else
 266                 return (val - cval->min) / cval->res;
 267 }
 268
 269 static int get_abs_value(struct usb_mixer_elem_info *cval, int val)
 270 {
 271         if (val < 0)
 272                 return cval->min;
 273         if (!cval->res)
 274                 cval->res = 1;
 275         val *= cval->res;
 276         val += cval->min;
 277         if (val > cval->max)
 278                 return cval->max;
 279         return val;
 280 }
 281
 282 static int uac2_ctl_value_size(int val_type)
 283 {
 284         switch (val_type) {
 285         case USB_MIXER_S32:
 286         case USB_MIXER_U32:
 287                 return 4;
 288         case USB_MIXER_S16:
 289         case USB_MIXER_U16:
 290                 return 2;
 291         default:
 292                 return 1;
 293         }
 294         return 0; /* unreachable */
 295 }
 296
 297
 298 /*
 299  * retrieve a mixer value
 300  */
 301
 302 static inline int mixer_ctrl_intf(struct usb_mixer_interface *mixer)
 303 {
 304         return get_iface_desc(mixer->hostif)->bInterfaceNumber;
 305 }
 306
 307 static int get_ctl_value_v1(struct usb_mixer_elem_info *cval, int request,
 308                             int validx, int *value_ret)
 309 {
 310         struct snd_usb_audio *chip = cval->head.mixer->chip;
 311         unsigned char buf[2];
 312         int val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
 313         int timeout = 10;
 314         int idx = 0, err;
 315
 316         err = snd_usb_lock_shutdown(chip);
 317         if (err < 0)
 318                 return -EIO;
 319
 320         while (timeout-- > 0) {
 321                 idx = mixer_ctrl_intf(cval->head.mixer) | (cval->head.id << 8);
 322                 err = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), request,
 323                                       USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
 324                                       validx, idx, buf, val_len);
 325                 if (err >= val_len) {
 326                         *value_ret = convert_signed_value(cval, snd_usb_combine_bytes(buf, val_len));
 327                         err = 0;
 328                         goto out;
 329                 } else if (err == -ETIMEDOUT) {
 330                         goto out;
 331                 }
 332         }
 333         usb_audio_dbg(chip,
 334                 "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
 335                 request, validx, idx, cval->val_type);
 336         err = -EINVAL;
 337
 338  out:
 339         snd_usb_unlock_shutdown(chip);
 340         return err;
 341 }
 342
 343 static int get_ctl_value_v2(struct usb_mixer_elem_info *cval, int request,
 344                             int validx, int *value_ret)
 345 {
 346         struct snd_usb_audio *chip = cval->head.mixer->chip;
 347         /* enough space for one range */
 348         unsigned char buf[sizeof(__u16) + 3 * sizeof(__u32)];
 349         unsigned char *val;
 350         int idx = 0, ret, val_size, size;
 351         __u8 bRequest;
 352
 353         val_size = uac2_ctl_value_size(cval->val_type);
 354
 355         if (request == UAC_GET_CUR) {
 356                 bRequest = UAC2_CS_CUR;
 357                 size = val_size;
 358         } else {
 359                 bRequest = UAC2_CS_RANGE;
 360                 size = sizeof(__u16) + 3 * val_size;
 361         }
 362
 363         memset(buf, 0, sizeof(buf));
 364
 365         if (snd_usb_lock_shutdown(chip))
 366                 return -EIO;
 367
 368         idx = mixer_ctrl_intf(cval->head.mixer) | (cval->head.id << 8);
 369         ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), bRequest,
 370                               USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
 371                               validx, idx, buf, size);
 372         snd_usb_unlock_shutdown(chip);
 373
 374         if (ret < 0) {
 375                 usb_audio_dbg(chip,
 376                         "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
 377                         request, validx, idx, cval->val_type);
 378                 return ret;
 379         }
 380
 381         /* FIXME: how should we handle multiple triplets here? */
 382
 383         switch (request) {
 384         case UAC_GET_CUR:
 385                 val = buf;
 386                 break;
 387         case UAC_GET_MIN:
 388                 val = buf + sizeof(__u16);
 389                 break;
 390         case UAC_GET_MAX:
 391                 val = buf + sizeof(__u16) + val_size;
 392                 break;
 393         case UAC_GET_RES:
 394                 val = buf + sizeof(__u16) + val_size * 2;
 395                 break;
 396         default:
 397                 return -EINVAL;
 398         }
 399
 400         *value_ret = convert_signed_value(cval,
 401                                           snd_usb_combine_bytes(val, val_size));
 402
 403         return 0;
 404 }
 405
 406 static int get_ctl_value(struct usb_mixer_elem_info *cval, int request,
 407                          int validx, int *value_ret)
 408 {
 409         validx += cval->idx_off;
 410
 411         return (cval->head.mixer->protocol == UAC_VERSION_1) ?
 412                 get_ctl_value_v1(cval, request, validx, value_ret) :
 413                 get_ctl_value_v2(cval, request, validx, value_ret);
 414 }
 415
 416 static int get_cur_ctl_value(struct usb_mixer_elem_info *cval,
 417                              int validx, int *value)
 418 {
 419         return get_ctl_value(cval, UAC_GET_CUR, validx, value);
 420 }
 421
 422 /* channel = 0: master, 1 = first channel */
 423 static inline int get_cur_mix_raw(struct usb_mixer_elem_info *cval,
 424                                   int channel, int *value)
 425 {
 426         return get_ctl_value(cval, UAC_GET_CUR,
 427                              (cval->control << 8) | channel,
 428                              value);
 429 }
 430
 431 int snd_usb_get_cur_mix_value(struct usb_mixer_elem_info *cval,
 432                              int channel, int index, int *value)
 433 {
 434         int err;
 435
 436         if (cval->cached & (1 << channel)) {
 437                 *value = cval->cache_val[index];
 438                 return 0;
 439         }
 440         err = get_cur_mix_raw(cval, channel, value);
 441         if (err < 0) {
 442                 if (!cval->head.mixer->ignore_ctl_error)
 443                         usb_audio_dbg(cval->head.mixer->chip,
 444                                 "cannot get current value for control %d ch %d: err = %d\n",
 445                                       cval->control, channel, err);
 446                 return err;
 447         }
 448         cval->cached |= 1 << channel;
 449         cval->cache_val[index] = *value;
 450         return 0;
 451 }
 452
 453 /*
 454  * set a mixer value
 455  */
 456
 457 int snd_usb_mixer_set_ctl_value(struct usb_mixer_elem_info *cval,
 458                                 int request, int validx, int value_set)
 459 {
 460         struct snd_usb_audio *chip = cval->head.mixer->chip;
 461         unsigned char buf[4];
 462         int idx = 0, val_len, err, timeout = 10;
 463
 464         validx += cval->idx_off;
 465
 466
 467         if (cval->head.mixer->protocol == UAC_VERSION_1) {
 468                 val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
 469         } else { /* UAC_VERSION_2/3 */
 470                 val_len = uac2_ctl_value_size(cval->val_type);
 471
 472                 /* FIXME */
 473                 if (request != UAC_SET_CUR) {
 474                         usb_audio_dbg(chip, "RANGE setting not yet supported\n");
 475                         return -EINVAL;
 476                 }
 477
 478                 request = UAC2_CS_CUR;
 479         }
 480
 481         value_set = convert_bytes_value(cval, value_set);
 482         buf[0] = value_set & 0xff;
 483         buf[1] = (value_set >> 8) & 0xff;
 484         buf[2] = (value_set >> 16) & 0xff;
 485         buf[3] = (value_set >> 24) & 0xff;
 486
 487         err = snd_usb_lock_shutdown(chip);
 488         if (err < 0)
 489                 return -EIO;
 490
 491         while (timeout-- > 0) {
 492                 idx = mixer_ctrl_intf(cval->head.mixer) | (cval->head.id << 8);
 493                 err = snd_usb_ctl_msg(chip->dev,
 494                                       usb_sndctrlpipe(chip->dev, 0), request,
 495                                       USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
 496                                       validx, idx, buf, val_len);
 497                 if (err >= 0) {
 498                         err = 0;
 499                         goto out;
 500                 } else if (err == -ETIMEDOUT) {
 501                         goto out;
 502                 }
 503         }
 504         usb_audio_dbg(chip, "cannot set ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d, data = %#x/%#x\n",
 505                       request, validx, idx, cval->val_type, buf[0], buf[1]);
 506         err = -EINVAL;
 507
 508  out:
 509         snd_usb_unlock_shutdown(chip);
 510         return err;
 511 }
 512
 513 static int set_cur_ctl_value(struct usb_mixer_elem_info *cval,
 514                              int validx, int value)
 515 {
 516         return snd_usb_mixer_set_ctl_value(cval, UAC_SET_CUR, validx, value);
 517 }
 518
 519 int snd_usb_set_cur_mix_value(struct usb_mixer_elem_info *cval, int channel,
 520                              int index, int value)
 521 {
 522         int err;
 523         unsigned int read_only = (channel == 0) ?
 524                 cval->master_readonly :
 525                 cval->ch_readonly & (1 << (channel - 1));
 526
 527         if (read_only) {
 528                 usb_audio_dbg(cval->head.mixer->chip,
 529                               "%s(): channel %d of control %d is read_only\n",
 530                             __func__, channel, cval->control);
 531                 return 0;
 532         }
 533
 534         err = snd_usb_mixer_set_ctl_value(cval,
 535                                           UAC_SET_CUR, (cval->control << 8) | channel,
 536                                           value);
 537         if (err < 0)
 538                 return err;
 539         cval->cached |= 1 << channel;
 540         cval->cache_val[index] = value;
 541         return 0;
 542 }
 543
 544 /*
 545  * TLV callback for mixer volume controls
 546  */
 547 int snd_usb_mixer_vol_tlv(struct snd_kcontrol *kcontrol, int op_flag,
 548                          unsigned int size, unsigned int __user *_tlv)
 549 {
 550         struct usb_mixer_elem_info *cval = kcontrol->private_data;
 551         DECLARE_TLV_DB_MINMAX(scale, 0, 0);
 552
 553         if (size < sizeof(scale))
 554                 return -ENOMEM;
 555         if (cval->min_mute)
 556                 scale[0] = SNDRV_CTL_TLVT_DB_MINMAX_MUTE;
 557         scale[2] = cval->dBmin;
 558         scale[3] = cval->dBmax;
 559         if (copy_to_user(_tlv, scale, sizeof(scale)))
 560                 return -EFAULT;
 561         return 0;
 562 }
 563
 564 /*
 565  * parser routines begin here...
 566  */
 567
 568 static int parse_audio_unit(struct mixer_build *state, int unitid);
 569
 570
 571 /*
 572  * check if the input/output channel routing is enabled on the given bitmap.
 573  * used for mixer unit parser
 574  */
 575 static int check_matrix_bitmap(unsigned char *bmap,
 576                                int ich, int och, int num_outs)
 577 {
 578         int idx = ich * num_outs + och;
 579         return bmap[idx >> 3] & (0x80 >> (idx & 7));
 580 }
 581
 582 /*
 583  * add an alsa control element
 584  * search and increment the index until an empty slot is found.
 585  *
 586  * if failed, give up and free the control instance.
 587  */
 588
 589 int snd_usb_mixer_add_list(struct usb_mixer_elem_list *list,
 590                            struct snd_kcontrol *kctl,
 591                            bool is_std_info)
 592 {
 593         struct usb_mixer_interface *mixer = list->mixer;
 594         int err;
 595
 596         while (snd_ctl_find_id(mixer->chip->card, &kctl->id))
 597                 kctl->id.index++;
 598         err = snd_ctl_add(mixer->chip->card, kctl);
 599         if (err < 0) {
 600                 usb_audio_dbg(mixer->chip, "cannot add control (err = %d)\n",
 601                               err);
 602                 return err;
 603         }
 604         list->kctl = kctl;
 605         list->is_std_info = is_std_info;
 606         list->next_id_elem = mixer->id_elems[list->id];
 607         mixer->id_elems[list->id] = list;
 608         return 0;
 609 }
 610
 611 /*
 612  * get a terminal name string
 613  */
 614
 615 static struct iterm_name_combo {
 616         int type;
 617         char *name;
 618 } iterm_names[] = {
 619         { 0x0300, "Output" },
 620         { 0x0301, "Speaker" },
 621         { 0x0302, "Headphone" },
 622         { 0x0303, "HMD Audio" },
 623         { 0x0304, "Desktop Speaker" },
 624         { 0x0305, "Room Speaker" },
 625         { 0x0306, "Com Speaker" },
 626         { 0x0307, "LFE" },
 627         { 0x0600, "External In" },
 628         { 0x0601, "Analog In" },
 629         { 0x0602, "Digital In" },
 630         { 0x0603, "Line" },
 631         { 0x0604, "Legacy In" },
 632         { 0x0605, "IEC958 In" },
 633         { 0x0606, "1394 DA Stream" },
 634         { 0x0607, "1394 DV Stream" },
 635         { 0x0700, "Embedded" },
 636         { 0x0701, "Noise Source" },
 637         { 0x0702, "Equalization Noise" },
 638         { 0x0703, "CD" },
 639         { 0x0704, "DAT" },
 640         { 0x0705, "DCC" },
 641         { 0x0706, "MiniDisk" },
 642         { 0x0707, "Analog Tape" },
 643         { 0x0708, "Phonograph" },
 644         { 0x0709, "VCR Audio" },
 645         { 0x070a, "Video Disk Audio" },
 646         { 0x070b, "DVD Audio" },
 647         { 0x070c, "TV Tuner Audio" },
 648         { 0x070d, "Satellite Rec Audio" },
 649         { 0x070e, "Cable Tuner Audio" },
 650         { 0x070f, "DSS Audio" },
 651         { 0x0710, "Radio Receiver" },
 652         { 0x0711, "Radio Transmitter" },
 653         { 0x0712, "Multi-Track Recorder" },
 654         { 0x0713, "Synthesizer" },
 655         { 0 },
 656 };
 657
 658 static int get_term_name(struct snd_usb_audio *chip, struct usb_audio_term *iterm,
 659                          unsigned char *name, int maxlen, int term_only)
 660 {
 661         struct iterm_name_combo *names;
 662         int len;
 663
 664         if (iterm->name) {
 665                 len = snd_usb_copy_string_desc(chip, iterm->name,
 666                                                 name, maxlen);
 667                 if (len)
 668                         return len;
 669         }
 670
 671         /* virtual type - not a real terminal */
 672         if (iterm->type >> 16) {
 673                 if (term_only)
 674                         return 0;
 675                 switch (iterm->type >> 16) {
 676                 case UAC3_SELECTOR_UNIT:
 677                         strcpy(name, "Selector");
 678                         return 8;
 679                 case UAC3_PROCESSING_UNIT:
 680                         strcpy(name, "Process Unit");
 681                         return 12;
 682                 case UAC3_EXTENSION_UNIT:
 683                         strcpy(name, "Ext Unit");
 684                         return 8;
 685                 case UAC3_MIXER_UNIT:
 686                         strcpy(name, "Mixer");
 687                         return 5;
 688                 default:
 689                         return sprintf(name, "Unit %d", iterm->id);
 690                 }
 691         }
 692
 693         switch (iterm->type & 0xff00) {
 694         case 0x0100:
 695                 strcpy(name, "PCM");
 696                 return 3;
 697         case 0x0200:
 698                 strcpy(name, "Mic");
 699                 return 3;
 700         case 0x0400:
 701                 strcpy(name, "Headset");
 702                 return 7;
 703         case 0x0500:
 704                 strcpy(name, "Phone");
 705                 return 5;
 706         }
 707
 708         for (names = iterm_names; names->type; names++) {
 709                 if (names->type == iterm->type) {
 710                         strcpy(name, names->name);
 711                         return strlen(names->name);
 712                 }
 713         }
 714
 715         return 0;
 716 }
 717
 718 /*
 719  * Get logical cluster information for UAC3 devices.
 720  */
 721 static int get_cluster_channels_v3(struct mixer_build *state, unsigned int cluster_id)
 722 {
 723         struct uac3_cluster_header_descriptor c_header;
 724         int err;
 725
 726         err = snd_usb_ctl_msg(state->chip->dev,
 727                         usb_rcvctrlpipe(state->chip->dev, 0),
 728                         UAC3_CS_REQ_HIGH_CAPABILITY_DESCRIPTOR,
 729                         USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
 730                         cluster_id,
 731                         snd_usb_ctrl_intf(state->chip),
 732                         &c_header, sizeof(c_header));
 733         if (err < 0)
 734                 goto error;
 735         if (err != sizeof(c_header)) {
 736                 err = -EIO;
 737                 goto error;
 738         }
 739
 740         return c_header.bNrChannels;
 741
 742 error:
 743         usb_audio_err(state->chip, "cannot request logical cluster ID: %d (err: %d)\n", cluster_id, err);
 744         return err;
 745 }
 746
 747 /*
 748  * Get number of channels for a Mixer Unit.
 749  */
 750 static int uac_mixer_unit_get_channels(struct mixer_build *state,
 751                                        struct uac_mixer_unit_descriptor *desc)
 752 {
 753         int mu_channels;
 754
 755         switch (state->mixer->protocol) {
 756         case UAC_VERSION_1:
 757         case UAC_VERSION_2:
 758         default:
 759                 if (desc->bLength < sizeof(*desc) + desc->bNrInPins + 1)
 760                         return 0; /* no bmControls -> skip */
 761                 mu_channels = uac_mixer_unit_bNrChannels(desc);
 762                 break;
 763         case UAC_VERSION_3:
 764                 mu_channels = get_cluster_channels_v3(state,
 765                                 uac3_mixer_unit_wClusterDescrID(desc));
 766                 break;
 767         }
 768
 769         return mu_channels;
 770 }
 771
 772 /*
 773  * Parse Input Terminal Unit
 774  */
 775 static int __check_input_term(struct mixer_build *state, int id,
 776                               struct usb_audio_term *term);
 777
 778 static int parse_term_uac1_iterm_unit(struct mixer_build *state,
 779                                       struct usb_audio_term *term,
 780                                       void *p1, int id)
 781 {
 782         struct uac_input_terminal_descriptor *d = p1;
 783
 784         term->type = le16_to_cpu(d->wTerminalType);
 785         term->channels = d->bNrChannels;
 786         term->chconfig = le16_to_cpu(d->wChannelConfig);
 787         term->name = d->iTerminal;
 788         return 0;
 789 }
 790
 791 static int parse_term_uac2_iterm_unit(struct mixer_build *state,
 792                                       struct usb_audio_term *term,
 793                                       void *p1, int id)
 794 {
 795         struct uac2_input_terminal_descriptor *d = p1;
 796         int err;
 797
 798         /* call recursively to verify the referenced clock entity */
 799         err = __check_input_term(state, d->bCSourceID, term);
 800         if (err < 0)
 801                 return err;
 802
 803         /* save input term properties after recursion,
 804          * to ensure they are not overriden by the recursion calls
 805          */
 806         term->id = id;
 807         term->type = le16_to_cpu(d->wTerminalType);
 808         term->channels = d->bNrChannels;
 809         term->chconfig = le32_to_cpu(d->bmChannelConfig);
 810         term->name = d->iTerminal;
 811         return 0;
 812 }
 813
 814 static int parse_term_uac3_iterm_unit(struct mixer_build *state,
 815                                       struct usb_audio_term *term,
 816                                       void *p1, int id)
 817 {
 818         struct uac3_input_terminal_descriptor *d = p1;
 819         int err;
 820
 821         /* call recursively to verify the referenced clock entity */
 822         err = __check_input_term(state, d->bCSourceID, term);
 823         if (err < 0)
 824                 return err;
 825
 826         /* save input term properties after recursion,
 827          * to ensure they are not overriden by the recursion calls
 828          */
 829         term->id = id;
 830         term->type = le16_to_cpu(d->wTerminalType);
 831
 832         err = get_cluster_channels_v3(state, le16_to_cpu(d->wClusterDescrID));
 833         if (err < 0)
 834                 return err;
 835         term->channels = err;
 836
 837         /* REVISIT: UAC3 IT doesn't have channels cfg */
 838         term->chconfig = 0;
 839
 840         term->name = le16_to_cpu(d->wTerminalDescrStr);
 841         return 0;
 842 }
 843
 844 static int parse_term_mixer_unit(struct mixer_build *state,
 845                                  struct usb_audio_term *term,
 846                                  void *p1, int id)
 847 {
 848         struct uac_mixer_unit_descriptor *d = p1;
 849         int protocol = state->mixer->protocol;
 850         int err;
 851
 852         err = uac_mixer_unit_get_channels(state, d);
 853         if (err <= 0)
 854                 return err;
 855
 856         term->type = UAC3_MIXER_UNIT << 16; /* virtual type */
 857         term->channels = err;
 858         if (protocol != UAC_VERSION_3) {
 859                 term->chconfig = uac_mixer_unit_wChannelConfig(d, protocol);
 860                 term->name = uac_mixer_unit_iMixer(d);
 861         }
 862         return 0;
 863 }
 864
 865 static int parse_term_selector_unit(struct mixer_build *state,
 866                                     struct usb_audio_term *term,
 867                                     void *p1, int id)
 868 {
 869         struct uac_selector_unit_descriptor *d = p1;
 870         int err;
 871
 872         /* call recursively to retrieve the channel info */
 873         err = __check_input_term(state, d->baSourceID[0], term);
 874         if (err < 0)
 875                 return err;
 876         term->type = UAC3_SELECTOR_UNIT << 16; /* virtual type */
 877         term->id = id;
 878         if (state->mixer->protocol != UAC_VERSION_3)
 879                 term->name = uac_selector_unit_iSelector(d);
 880         return 0;
 881 }
 882
 883 static int parse_term_proc_unit(struct mixer_build *state,
 884                                 struct usb_audio_term *term,
 885                                 void *p1, int id, int vtype)
 886 {
 887         struct uac_processing_unit_descriptor *d = p1;
 888         int protocol = state->mixer->protocol;
 889         int err;
 890
 891         if (d->bNrInPins) {
 892                 /* call recursively to retrieve the channel info */
 893                 err = __check_input_term(state, d->baSourceID[0], term);
 894                 if (err < 0)
 895                         return err;
 896         }
 897
 898         term->type = vtype << 16; /* virtual type */
 899         term->id = id;
 900
 901         if (protocol == UAC_VERSION_3)
 902                 return 0;
 903
 904         if (!term->channels) {
 905                 term->channels = uac_processing_unit_bNrChannels(d);
 906                 term->chconfig = uac_processing_unit_wChannelConfig(d, protocol);
 907         }
 908         term->name = uac_processing_unit_iProcessing(d, protocol);
 909         return 0;
 910 }
 911
 912 static int parse_term_effect_unit(struct mixer_build *state,
 913                                   struct usb_audio_term *term,
 914                                   void *p1, int id)
 915 {
 916         struct uac2_effect_unit_descriptor *d = p1;
 917         int err;
 918
 919         err = __check_input_term(state, d->bSourceID, term);
 920         if (err < 0)
 921                 return err;
 922         term->type = UAC3_EFFECT_UNIT << 16; /* virtual type */
 923         term->id = id;
 924         return 0;
 925 }
 926
 927 static int parse_term_uac2_clock_source(struct mixer_build *state,
 928                                         struct usb_audio_term *term,
 929                                         void *p1, int id)
 930 {
 931         struct uac_clock_source_descriptor *d = p1;
 932
 933         term->type = UAC3_CLOCK_SOURCE << 16; /* virtual type */
 934         term->id = id;
 935         term->name = d->iClockSource;
 936         return 0;
 937 }
 938
 939 static int parse_term_uac3_clock_source(struct mixer_build *state,
 940                                         struct usb_audio_term *term,
 941                                         void *p1, int id)
 942 {
 943         struct uac3_clock_source_descriptor *d = p1;
 944
 945         term->type = UAC3_CLOCK_SOURCE << 16; /* virtual type */
 946         term->id = id;
 947         term->name = le16_to_cpu(d->wClockSourceStr);
 948         return 0;
 949 }
 950
 951 #define PTYPE(a, b)     ((a) << 8 | (b))
 952
 953 /*
 954  * parse the source unit recursively until it reaches to a terminal
 955  * or a branched unit.
 956  */
 957 static int __check_input_term(struct mixer_build *state, int id,
 958                               struct usb_audio_term *term)
 959 {
 960         int protocol = state->mixer->protocol;
 961         void *p1;
 962         unsigned char *hdr;
 963
 964         for (;;) {
 965                 /* a loop in the terminal chain? */
 966                 if (test_and_set_bit(id, state->termbitmap))
 967                         return -EINVAL;
 968
 969                 p1 = find_audio_control_unit(state, id);
 970                 if (!p1)
 971                         break;
 972                 if (!snd_usb_validate_audio_desc(p1, protocol))
 973                         break; /* bad descriptor */
 974
 975                 hdr = p1;
 976                 term->id = id;
 977
 978                 switch (PTYPE(protocol, hdr[2])) {
 979                 case PTYPE(UAC_VERSION_1, UAC_FEATURE_UNIT):
 980                 case PTYPE(UAC_VERSION_2, UAC_FEATURE_UNIT):
 981                 case PTYPE(UAC_VERSION_3, UAC3_FEATURE_UNIT): {
 982                         /* the header is the same for all versions */
 983                         struct uac_feature_unit_descriptor *d = p1;
 984
 985                         id = d->bSourceID;
 986                         break; /* continue to parse */
 987                 }
 988                 case PTYPE(UAC_VERSION_1, UAC_INPUT_TERMINAL):
 989                         return parse_term_uac1_iterm_unit(state, term, p1, id);
 990                 case PTYPE(UAC_VERSION_2, UAC_INPUT_TERMINAL):
 991                         return parse_term_uac2_iterm_unit(state, term, p1, id);
 992                 case PTYPE(UAC_VERSION_3, UAC_INPUT_TERMINAL):
 993                         return parse_term_uac3_iterm_unit(state, term, p1, id);
 994                 case PTYPE(UAC_VERSION_1, UAC_MIXER_UNIT):
 995                 case PTYPE(UAC_VERSION_2, UAC_MIXER_UNIT):
 996                 case PTYPE(UAC_VERSION_3, UAC3_MIXER_UNIT):
 997                         return parse_term_mixer_unit(state, term, p1, id);
 998                 case PTYPE(UAC_VERSION_1, UAC_SELECTOR_UNIT):
 999                 case PTYPE(UAC_VERSION_2, UAC_SELECTOR_UNIT):
1000                 case PTYPE(UAC_VERSION_2, UAC2_CLOCK_SELECTOR):
1001                 case PTYPE(UAC_VERSION_3, UAC3_SELECTOR_UNIT):
1002                 case PTYPE(UAC_VERSION_3, UAC3_CLOCK_SELECTOR):
1003                         return parse_term_selector_unit(state, term, p1, id);
1004                 case PTYPE(UAC_VERSION_1, UAC1_PROCESSING_UNIT):
1005                 case PTYPE(UAC_VERSION_2, UAC2_PROCESSING_UNIT_V2):
1006                 case PTYPE(UAC_VERSION_3, UAC3_PROCESSING_UNIT):
1007                         return parse_term_proc_unit(state, term, p1, id,
1008                                                     UAC3_PROCESSING_UNIT);
1009                 case PTYPE(UAC_VERSION_2, UAC2_EFFECT_UNIT):
1010                 case PTYPE(UAC_VERSION_3, UAC3_EFFECT_UNIT):
1011                         return parse_term_effect_unit(state, term, p1, id);
1012                 case PTYPE(UAC_VERSION_1, UAC1_EXTENSION_UNIT):
1013                 case PTYPE(UAC_VERSION_2, UAC2_EXTENSION_UNIT_V2):
1014                 case PTYPE(UAC_VERSION_3, UAC3_EXTENSION_UNIT):
1015                         return parse_term_proc_unit(state, term, p1, id,
1016                                                     UAC3_EXTENSION_UNIT);
1017                 case PTYPE(UAC_VERSION_2, UAC2_CLOCK_SOURCE):
1018                         return parse_term_uac2_clock_source(state, term, p1, id);
1019                 case PTYPE(UAC_VERSION_3, UAC3_CLOCK_SOURCE):
1020                         return parse_term_uac3_clock_source(state, term, p1, id);
1021                 default:
1022                         return -ENODEV;
1023                 }
1024         }
1025         return -ENODEV;
1026 }
1027
1028
1029 static int check_input_term(struct mixer_build *state, int id,
1030                             struct usb_audio_term *term)
1031 {
1032         memset(term, 0, sizeof(*term));
1033         memset(state->termbitmap, 0, sizeof(state->termbitmap));
1034         return __check_input_term(state, id, term);
1035 }
1036
1037 /*
1038  * Feature Unit
1039  */
1040
1041 /* feature unit control information */
1042 struct usb_feature_control_info {
1043         int control;
1044         const char *name;
1045         int type;       /* data type for uac1 */
1046         int type_uac2;  /* data type for uac2 if different from uac1, else -1 */
1047 };
1048
1049 static const struct usb_feature_control_info audio_feature_info[] = {
1050         { UAC_FU_MUTE,                  "Mute",                 USB_MIXER_INV_BOOLEAN, -1 },
1051         { UAC_FU_VOLUME,                "Volume",               USB_MIXER_S16, -1 },
1052         { UAC_FU_BASS,                  "Tone Control - Bass",  USB_MIXER_S8, -1 },
1053         { UAC_FU_MID,                   "Tone Control - Mid",   USB_MIXER_S8, -1 },
1054         { UAC_FU_TREBLE,                "Tone Control - Treble", USB_MIXER_S8, -1 },
1055         { UAC_FU_GRAPHIC_EQUALIZER,     "Graphic Equalizer",    USB_MIXER_S8, -1 }, /* FIXME: not implemented yet */
1056         { UAC_FU_AUTOMATIC_GAIN,        "Auto Gain Control",    USB_MIXER_BOOLEAN, -1 },
1057         { UAC_FU_DELAY,                 "Delay Control",        USB_MIXER_U16, USB_MIXER_U32 },
1058         { UAC_FU_BASS_BOOST,            "Bass Boost",           USB_MIXER_BOOLEAN, -1 },
1059         { UAC_FU_LOUDNESS,              "Loudness",             USB_MIXER_BOOLEAN, -1 },
1060         /* UAC2 specific */
1061         { UAC2_FU_INPUT_GAIN,           "Input Gain Control",   USB_MIXER_S16, -1 },
1062         { UAC2_FU_INPUT_GAIN_PAD,       "Input Gain Pad Control", USB_MIXER_S16, -1 },
1063         { UAC2_FU_PHASE_INVERTER,        "Phase Inverter Control", USB_MIXER_BOOLEAN, -1 },
1064 };
1065
1066 static void usb_mixer_elem_info_free(struct usb_mixer_elem_info *cval)
1067 {
1068         kfree(cval);
1069 }
1070
1071 /* private_free callback */
1072 void snd_usb_mixer_elem_free(struct snd_kcontrol *kctl)
1073 {
1074         usb_mixer_elem_info_free(kctl->private_data);
1075         kctl->private_data = NULL;
1076 }
1077
1078 /*
1079  * interface to ALSA control for feature/mixer units
1080  */
1081
1082 /* volume control quirks */
1083 static void volume_control_quirks(struct usb_mixer_elem_info *cval,
1084                                   struct snd_kcontrol *kctl)
1085 {
1086         struct snd_usb_audio *chip = cval->head.mixer->chip;
1087         switch (chip->usb_id) {
1088         case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
1089         case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
1090                 if (strcmp(kctl->id.name, "Effect Duration") == 0) {
1091                         cval->min = 0x0000;
1092                         cval->max = 0xffff;
1093                         cval->res = 0x00e6;
1094                         break;
1095                 }
1096                 if (strcmp(kctl->id.name, "Effect Volume") == 0 ||
1097                     strcmp(kctl->id.name, "Effect Feedback Volume") == 0) {
1098                         cval->min = 0x00;
1099                         cval->max = 0xff;
1100                         break;
1101                 }
1102                 if (strstr(kctl->id.name, "Effect Return") != NULL) {
1103                         cval->min = 0xb706;
1104                         cval->max = 0xff7b;
1105                         cval->res = 0x0073;
1106                         break;
1107                 }
1108                 if ((strstr(kctl->id.name, "Playback Volume") != NULL) ||
1109                         (strstr(kctl->id.name, "Effect Send") != NULL)) {
1110                         cval->min = 0xb5fb; /* -73 dB = 0xb6ff */
1111                         cval->max = 0xfcfe;
1112                         cval->res = 0x0073;
1113                 }
1114                 break;
1115
1116         case USB_ID(0x0763, 0x2081): /* M-Audio Fast Track Ultra 8R */
1117         case USB_ID(0x0763, 0x2080): /* M-Audio Fast Track Ultra */
1118                 if (strcmp(kctl->id.name, "Effect Duration") == 0) {
1119                         usb_audio_info(chip,
1120                                        "set quirk for FTU Effect Duration\n");
1121                         cval->min = 0x0000;
1122                         cval->max = 0x7f00;
1123                         cval->res = 0x0100;
1124                         break;
1125                 }
1126                 if (strcmp(kctl->id.name, "Effect Volume") == 0 ||
1127                     strcmp(kctl->id.name, "Effect Feedback Volume") == 0) {
1128                         usb_audio_info(chip,
1129                                        "set quirks for FTU Effect Feedback/Volume\n");
1130                         cval->min = 0x00;
1131                         cval->max = 0x7f;
1132                         break;
1133                 }
1134                 break;
1135
1136         case USB_ID(0x0d8c, 0x0103):
1137                 if (!strcmp(kctl->id.name, "PCM Playback Volume")) {
1138                         usb_audio_info(chip,
1139                                  "set volume quirk for CM102-A+/102S+\n");
1140                         cval->min = -256;
1141                 }
1142                 break;
1143
1144         case USB_ID(0x0471, 0x0101):
1145         case USB_ID(0x0471, 0x0104):
1146         case USB_ID(0x0471, 0x0105):
1147         case USB_ID(0x0672, 0x1041):
1148         /* quirk for UDA1321/N101.
1149          * note that detection between firmware 2.1.1.7 (N101)
1150          * and later 2.1.1.21 is not very clear from datasheets.
1151          * I hope that the min value is -15360 for newer firmware --jk
1152          */
1153                 if (!strcmp(kctl->id.name, "PCM Playback Volume") &&
1154                     cval->min == -15616) {
1155                         usb_audio_info(chip,
1156                                  "set volume quirk for UDA1321/N101 chip\n");
1157                         cval->max = -256;
1158                 }
1159                 break;
1160
1161         case USB_ID(0x046d, 0x09a4):
1162                 if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
1163                         usb_audio_info(chip,
1164                                 "set volume quirk for QuickCam E3500\n");
1165                         cval->min = 6080;
1166                         cval->max = 8768;
1167                         cval->res = 192;
1168                 }
1169                 break;
1170
1171         case USB_ID(0x046d, 0x0807): /* Logitech Webcam C500 */
1172         case USB_ID(0x046d, 0x0808):
1173         case USB_ID(0x046d, 0x0809):
1174         case USB_ID(0x046d, 0x0819): /* Logitech Webcam C210 */
1175         case USB_ID(0x046d, 0x081b): /* HD Webcam c310 */
1176         case USB_ID(0x046d, 0x081d): /* HD Webcam c510 */
1177         case USB_ID(0x046d, 0x0825): /* HD Webcam c270 */
1178         case USB_ID(0x046d, 0x0826): /* HD Webcam c525 */
1179         case USB_ID(0x046d, 0x08ca): /* Logitech Quickcam Fusion */
1180         case USB_ID(0x046d, 0x0991):
1181         case USB_ID(0x046d, 0x09a2): /* QuickCam Communicate Deluxe/S7500 */
1182         /* Most audio usb devices lie about volume resolution.
1183          * Most Logitech webcams have res = 384.
1184          * Probably there is some logitech magic behind this number --fishor
1185          */
1186                 if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
1187                         usb_audio_info(chip,
1188                                 "set resolution quirk: cval->res = 384\n");
1189                         cval->res = 384;
1190                 }
1191                 break;
1192         case USB_ID(0x0495, 0x3042): /* ESS Technology Asus USB DAC */
1193                 if ((strstr(kctl->id.name, "Playback Volume") != NULL) ||
1194                         strstr(kctl->id.name, "Capture Volume") != NULL) {
1195                         cval->min >>= 8;
1196                         cval->max = 0;
1197                         cval->res = 1;
1198                 }
1199                 break;
1200         case USB_ID(0x1224, 0x2a25): /* Jieli Technology USB PHY 2.0 */
1201                 if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
1202                         usb_audio_info(chip,
1203                                 "set resolution quirk: cval->res = 16\n");
1204                         cval->res = 16;
1205                 }
1206                 break;
1207         }
1208 }
1209
1210 /* forcibly initialize the current mixer value; if GET_CUR fails, set to
1211  * the minimum as default
1212  */
1213 static void init_cur_mix_raw(struct usb_mixer_elem_info *cval, int ch, int idx)
1214 {
1215         int val, err;
1216
1217         err = snd_usb_get_cur_mix_value(cval, ch, idx, &val);
1218         if (!err)
1219                 return;
1220         if (!cval->head.mixer->ignore_ctl_error)
1221                 usb_audio_warn(cval->head.mixer->chip,
1222                                "%d:%d: failed to get current value for ch %d (%d)\n",
1223                                cval->head.id, mixer_ctrl_intf(cval->head.mixer),
1224                                ch, err);
1225         snd_usb_set_cur_mix_value(cval, ch, idx, cval->min);
1226 }
1227
1228 /*
1229  * retrieve the minimum and maximum values for the specified control
1230  */
1231 static int get_min_max_with_quirks(struct usb_mixer_elem_info *cval,
1232                                    int default_min, struct snd_kcontrol *kctl)
1233 {
1234         int i, idx;
1235
1236         /* for failsafe */
1237         cval->min = default_min;
1238         cval->max = cval->min + 1;
1239         cval->res = 1;
1240         cval->dBmin = cval->dBmax = 0;
1241
1242         if (cval->val_type == USB_MIXER_BOOLEAN ||
1243             cval->val_type == USB_MIXER_INV_BOOLEAN) {
1244                 cval->initialized = 1;
1245         } else {
1246                 int minchn = 0;
1247                 if (cval->cmask) {
1248                         for (i = 0; i < MAX_CHANNELS; i++)
1249                                 if (cval->cmask & (1 << i)) {
1250                                         minchn = i + 1;
1251                                         break;
1252                                 }
1253                 }
1254                 if (get_ctl_value(cval, UAC_GET_MAX, (cval->control << 8) | minchn, &cval->max) < 0 ||
1255                     get_ctl_value(cval, UAC_GET_MIN, (cval->control << 8) | minchn, &cval->min) < 0) {
1256                         usb_audio_err(cval->head.mixer->chip,
1257                                       "%d:%d: cannot get min/max values for control %d (id %d)\n",
1258                                    cval->head.id, mixer_ctrl_intf(cval->head.mixer),
1259                                                                cval->control, cval->head.id);
1260                         return -EINVAL;
1261                 }
1262                 if (get_ctl_value(cval, UAC_GET_RES,
1263                                   (cval->control << 8) | minchn,
1264                                   &cval->res) < 0) {
1265                         cval->res = 1;
1266                 } else if (cval->head.mixer->protocol == UAC_VERSION_1) {
1267                         int last_valid_res = cval->res;
1268
1269                         while (cval->res > 1) {
1270                                 if (snd_usb_mixer_set_ctl_value(cval, UAC_SET_RES,
1271                                                                 (cval->control << 8) | minchn,
1272                                                                 cval->res / 2) < 0)
1273                                         break;
1274                                 cval->res /= 2;
1275                         }
1276                         if (get_ctl_value(cval, UAC_GET_RES,
1277                                           (cval->control << 8) | minchn, &cval->res) < 0)
1278                                 cval->res = last_valid_res;
1279                 }
1280                 if (cval->res == 0)
1281                         cval->res = 1;
1282
1283                 /* Additional checks for the proper resolution
1284                  *
1285                  * Some devices report smaller resolutions than actually
1286                  * reacting.  They don't return errors but simply clip
1287                  * to the lower aligned value.
1288                  */
1289                 if (cval->min + cval->res < cval->max) {
1290                         int last_valid_res = cval->res;
1291                         int saved, test, check;
1292                         if (get_cur_mix_raw(cval, minchn, &saved) < 0)
1293                                 goto no_res_check;
1294                         for (;;) {
1295                                 test = saved;
1296                                 if (test < cval->max)
1297                                         test += cval->res;
1298                                 else
1299                                         test -= cval->res;
1300                                 if (test < cval->min || test > cval->max ||
1301                                     snd_usb_set_cur_mix_value(cval, minchn, 0, test) ||
1302                                     get_cur_mix_raw(cval, minchn, &check)) {
1303                                         cval->res = last_valid_res;
1304                                         break;
1305                                 }
1306                                 if (test == check)
1307                                         break;
1308                                 cval->res *= 2;
1309                         }
1310                         snd_usb_set_cur_mix_value(cval, minchn, 0, saved);
1311                 }
1312
1313 no_res_check:
1314                 cval->initialized = 1;
1315         }
1316
1317         if (kctl)
1318                 volume_control_quirks(cval, kctl);
1319
1320         /* USB descriptions contain the dB scale in 1/256 dB unit
1321          * while ALSA TLV contains in 1/100 dB unit
1322          */
1323         cval->dBmin = (convert_signed_value(cval, cval->min) * 100) / 256;
1324         cval->dBmax = (convert_signed_value(cval, cval->max) * 100) / 256;
1325         if (cval->dBmin > cval->dBmax) {
1326                 /* something is wrong; assume it's either from/to 0dB */
1327                 if (cval->dBmin < 0)
1328                         cval->dBmax = 0;
1329                 else if (cval->dBmin > 0)
1330                         cval->dBmin = 0;
1331                 if (cval->dBmin > cval->dBmax) {
1332                         /* totally crap, return an error */
1333                         return -EINVAL;
1334                 }
1335         } else {
1336                 /* if the max volume is too low, it's likely a bogus range;
1337                  * here we use -96dB as the threshold
1338                  */
1339                 if (cval->dBmax <= -9600) {
1340                         usb_audio_info(cval->head.mixer->chip,
1341                                        "%d:%d: bogus dB values (%d/%d), disabling dB reporting\n",
1342                                        cval->head.id, mixer_ctrl_intf(cval->head.mixer),
1343                                        cval->dBmin, cval->dBmax);
1344                         cval->dBmin = cval->dBmax = 0;
1345                 }
1346         }
1347
1348         /* initialize all elements */
1349         if (!cval->cmask) {
1350                 init_cur_mix_raw(cval, 0, 0);
1351         } else {
1352                 idx = 0;
1353                 for (i = 0; i < MAX_CHANNELS; i++) {
1354                         if (cval->cmask & (1 << i)) {
1355                                 init_cur_mix_raw(cval, i + 1, idx);
1356                                 idx++;
1357                         }
1358                 }
1359         }
1360
1361         return 0;
1362 }
1363
1364 #define get_min_max(cval, def)  get_min_max_with_quirks(cval, def, NULL)
1365
1366 /* get a feature/mixer unit info */
1367 static int mixer_ctl_feature_info(struct snd_kcontrol *kcontrol,
1368                                   struct snd_ctl_elem_info *uinfo)
1369 {
1370         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1371
1372         if (cval->val_type == USB_MIXER_BOOLEAN ||
1373             cval->val_type == USB_MIXER_INV_BOOLEAN)
1374                 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1375         else
1376                 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
1377         uinfo->count = cval->channels;
1378         if (cval->val_type == USB_MIXER_BOOLEAN ||
1379             cval->val_type == USB_MIXER_INV_BOOLEAN) {
1380                 uinfo->value.integer.min = 0;
1381                 uinfo->value.integer.max = 1;
1382         } else {
1383                 if (!cval->initialized) {
1384                         get_min_max_with_quirks(cval, 0, kcontrol);
1385                         if (cval->initialized && cval->dBmin >= cval->dBmax) {
1386                                 kcontrol->vd[0].access &=
1387                                         ~(SNDRV_CTL_ELEM_ACCESS_TLV_READ |
1388                                           SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK);
1389                                 snd_ctl_notify(cval->head.mixer->chip->card,
1390                                                SNDRV_CTL_EVENT_MASK_INFO,
1391                                                &kcontrol->id);
1392                         }
1393                 }
1394                 uinfo->value.integer.min = 0;
1395                 uinfo->value.integer.max =
1396                         DIV_ROUND_UP(cval->max - cval->min, cval->res);
1397         }
1398         return 0;
1399 }
1400
1401 /* get the current value from feature/mixer unit */
1402 static int mixer_ctl_feature_get(struct snd_kcontrol *kcontrol,
1403                                  struct snd_ctl_elem_value *ucontrol)
1404 {
1405         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1406         int c, cnt, val, err;
1407
1408         ucontrol->value.integer.value[0] = cval->min;
1409         if (cval->cmask) {
1410                 cnt = 0;
1411                 for (c = 0; c < MAX_CHANNELS; c++) {
1412                         if (!(cval->cmask & (1 << c)))
1413                                 continue;
1414                         err = snd_usb_get_cur_mix_value(cval, c + 1, cnt, &val);
1415                         if (err < 0)
1416                                 return filter_error(cval, err);
1417                         val = get_relative_value(cval, val);
1418                         ucontrol->value.integer.value[cnt] = val;
1419                         cnt++;
1420                 }
1421                 return 0;
1422         } else {
1423                 /* master channel */
1424                 err = snd_usb_get_cur_mix_value(cval, 0, 0, &val);
1425                 if (err < 0)
1426                         return filter_error(cval, err);
1427                 val = get_relative_value(cval, val);
1428                 ucontrol->value.integer.value[0] = val;
1429         }
1430         return 0;
1431 }
1432
1433 /* put the current value to feature/mixer unit */
1434 static int mixer_ctl_feature_put(struct snd_kcontrol *kcontrol,
1435                                  struct snd_ctl_elem_value *ucontrol)
1436 {
1437         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1438         int c, cnt, val, oval, err;
1439         int changed = 0;
1440
1441         if (cval->cmask) {
1442                 cnt = 0;
1443                 for (c = 0; c < MAX_CHANNELS; c++) {
1444                         if (!(cval->cmask & (1 << c)))
1445                                 continue;
1446                         err = snd_usb_get_cur_mix_value(cval, c + 1, cnt, &oval);
1447                         if (err < 0)
1448                                 return filter_error(cval, err);
1449                         val = ucontrol->value.integer.value[cnt];
1450                         val = get_abs_value(cval, val);
1451                         if (oval != val) {
1452                                 snd_usb_set_cur_mix_value(cval, c + 1, cnt, val);
1453                                 changed = 1;
1454                         }
1455                         cnt++;
1456                 }
1457         } else {
1458                 /* master channel */
1459                 err = snd_usb_get_cur_mix_value(cval, 0, 0, &oval);
1460                 if (err < 0)
1461                         return filter_error(cval, err);
1462                 val = ucontrol->value.integer.value[0];
1463                 val = get_abs_value(cval, val);
1464                 if (val != oval) {
1465                         snd_usb_set_cur_mix_value(cval, 0, 0, val);
1466                         changed = 1;
1467                 }
1468         }
1469         return changed;
1470 }
1471
1472 /* get the boolean value from the master channel of a UAC control */
1473 static int mixer_ctl_master_bool_get(struct snd_kcontrol *kcontrol,
1474                                      struct snd_ctl_elem_value *ucontrol)
1475 {
1476         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1477         int val, err;
1478
1479         err = snd_usb_get_cur_mix_value(cval, 0, 0, &val);
1480         if (err < 0)
1481                 return filter_error(cval, err);
1482         val = (val != 0);
1483         ucontrol->value.integer.value[0] = val;
1484         return 0;
1485 }
1486
1487 static int get_connector_value(struct usb_mixer_elem_info *cval,
1488                                char *name, int *val)
1489 {
1490         struct snd_usb_audio *chip = cval->head.mixer->chip;
1491         int idx = 0, validx, ret;
1492
1493         validx = cval->control << 8 | 0;
1494
1495         ret = snd_usb_lock_shutdown(chip) ? -EIO : 0;
1496         if (ret)
1497                 goto error;
1498
1499         idx = mixer_ctrl_intf(cval->head.mixer) | (cval->head.id << 8);
1500         if (cval->head.mixer->protocol == UAC_VERSION_2) {
1501                 struct uac2_connectors_ctl_blk uac2_conn;
1502
1503                 ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), UAC2_CS_CUR,
1504                                       USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
1505                                       validx, idx, &uac2_conn, sizeof(uac2_conn));
1506                 if (val)
1507                         *val = !!uac2_conn.bNrChannels;
1508         } else { /* UAC_VERSION_3 */
1509                 struct uac3_insertion_ctl_blk uac3_conn;
1510
1511                 ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), UAC2_CS_CUR,
1512                                       USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
1513                                       validx, idx, &uac3_conn, sizeof(uac3_conn));
1514                 if (val)
1515                         *val = !!uac3_conn.bmConInserted;
1516         }
1517
1518         snd_usb_unlock_shutdown(chip);
1519
1520         if (ret < 0) {
1521                 if (name && strstr(name, "Speaker")) {
1522                         if (val)
1523                                 *val = 1;
1524                         return 0;
1525                 }
1526 error:
1527                 usb_audio_err(chip,
1528                         "cannot get connectors status: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
1529                         UAC_GET_CUR, validx, idx, cval->val_type);
1530
1531                 if (val)
1532                         *val = 0;
1533
1534                 return filter_error(cval, ret);
1535         }
1536
1537         return ret;
1538 }
1539
1540 /* get the connectors status and report it as boolean type */
1541 static int mixer_ctl_connector_get(struct snd_kcontrol *kcontrol,
1542                                    struct snd_ctl_elem_value *ucontrol)
1543 {
1544         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1545         int ret, val;
1546
1547         ret = get_connector_value(cval, kcontrol->id.name, &val);
1548
1549         if (ret < 0)
1550                 return ret;
1551
1552         ucontrol->value.integer.value[0] = val;
1553         return 0;
1554 }
1555
1556 static const struct snd_kcontrol_new usb_feature_unit_ctl = {
1557         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1558         .name = "", /* will be filled later manually */
1559         .info = mixer_ctl_feature_info,
1560         .get = mixer_ctl_feature_get,
1561         .put = mixer_ctl_feature_put,
1562 };
1563
1564 /* the read-only variant */
1565 static const struct snd_kcontrol_new usb_feature_unit_ctl_ro = {
1566         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1567         .name = "", /* will be filled later manually */
1568         .info = mixer_ctl_feature_info,
1569         .get = mixer_ctl_feature_get,
1570         .put = NULL,
1571 };
1572
1573 /*
1574  * A control which shows the boolean value from reading a UAC control on
1575  * the master channel.
1576  */
1577 static const struct snd_kcontrol_new usb_bool_master_control_ctl_ro = {
1578         .iface = SNDRV_CTL_ELEM_IFACE_CARD,
1579         .name = "", /* will be filled later manually */
1580         .access = SNDRV_CTL_ELEM_ACCESS_READ,
1581         .info = snd_ctl_boolean_mono_info,
1582         .get = mixer_ctl_master_bool_get,
1583         .put = NULL,
1584 };
1585
1586 static const struct snd_kcontrol_new usb_connector_ctl_ro = {
1587         .iface = SNDRV_CTL_ELEM_IFACE_CARD,
1588         .name = "", /* will be filled later manually */
1589         .access = SNDRV_CTL_ELEM_ACCESS_READ,
1590         .info = snd_ctl_boolean_mono_info,
1591         .get = mixer_ctl_connector_get,
1592         .put = NULL,
1593 };
1594
1595 /*
1596  * This symbol is exported in order to allow the mixer quirks to
1597  * hook up to the standard feature unit control mechanism
1598  */
1599 const struct snd_kcontrol_new *snd_usb_feature_unit_ctl = &usb_feature_unit_ctl;
1600
1601 /*
1602  * build a feature control
1603  */
1604 static size_t append_ctl_name(struct snd_kcontrol *kctl, const char *str)
1605 {
1606         return strlcat(kctl->id.name, str, sizeof(kctl->id.name));
1607 }
1608
1609 /*
1610  * A lot of headsets/headphones have a "Speaker" mixer. Make sure we
1611  * rename it to "Headphone". We determine if something is a headphone
1612  * similar to how udev determines form factor.
1613  */
1614 static void check_no_speaker_on_headset(struct snd_kcontrol *kctl,
1615                                         struct snd_card *card)
1616 {
1617         static const char * const names_to_check[] = {
1618                 "Headset", "headset", "Headphone", "headphone", NULL};
1619         const char * const *s;
1620         bool found = false;
1621
1622         if (strcmp("Speaker", kctl->id.name))
1623                 return;
1624
1625         for (s = names_to_check; *s; s++)
1626                 if (strstr(card->shortname, *s)) {
1627                         found = true;
1628                         break;
1629                 }
1630
1631         if (!found)
1632                 return;
1633
1634         snd_ctl_rename(card, kctl, "Headphone");
1635 }
1636
1637 static const struct usb_feature_control_info *get_feature_control_info(int control)
1638 {
1639         int i;
1640
1641         for (i = 0; i < ARRAY_SIZE(audio_feature_info); ++i) {
1642                 if (audio_feature_info[i].control == control)
1643                         return &audio_feature_info[i];
1644         }
1645         return NULL;
1646 }
1647
1648 static void __build_feature_ctl(struct usb_mixer_interface *mixer,
1649                                 const struct usbmix_name_map *imap,
1650                                 unsigned int ctl_mask, int control,
1651                                 struct usb_audio_term *iterm,
1652                                 struct usb_audio_term *oterm,
1653                                 int unitid, int nameid, int readonly_mask)
1654 {
1655         const struct usb_feature_control_info *ctl_info;
1656         unsigned int len = 0;
1657         int mapped_name = 0;
1658         struct snd_kcontrol *kctl;
1659         struct usb_mixer_elem_info *cval;
1660         const struct usbmix_name_map *map;
1661         unsigned int range;
1662
1663         if (control == UAC_FU_GRAPHIC_EQUALIZER) {
1664                 /* FIXME: not supported yet */
1665                 return;
1666         }
1667
1668         map = find_map(imap, unitid, control);
1669         if (check_ignored_ctl(map))
1670                 return;
1671
1672         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1673         if (!cval)
1674                 return;
1675         snd_usb_mixer_elem_init_std(&cval->head, mixer, unitid);
1676         cval->control = control;
1677         cval->cmask = ctl_mask;
1678
1679         ctl_info = get_feature_control_info(control);
1680         if (!ctl_info) {
1681                 usb_mixer_elem_info_free(cval);
1682                 return;
1683         }
1684         if (mixer->protocol == UAC_VERSION_1)
1685                 cval->val_type = ctl_info->type;
1686         else /* UAC_VERSION_2 */
1687                 cval->val_type = ctl_info->type_uac2 >= 0 ?
1688                         ctl_info->type_uac2 : ctl_info->type;
1689
1690         if (ctl_mask == 0) {
1691                 cval->channels = 1;     /* master channel */
1692                 cval->master_readonly = readonly_mask;
1693         } else {
1694                 int i, c = 0;
1695                 for (i = 0; i < 16; i++)
1696                         if (ctl_mask & (1 << i))
1697                                 c++;
1698                 cval->channels = c;
1699                 cval->ch_readonly = readonly_mask;
1700         }
1701
1702         /*
1703          * If all channels in the mask are marked read-only, make the control
1704          * read-only. snd_usb_set_cur_mix_value() will check the mask again and won't
1705          * issue write commands to read-only channels.
1706          */
1707         if (cval->channels == readonly_mask)
1708                 kctl = snd_ctl_new1(&usb_feature_unit_ctl_ro, cval);
1709         else
1710                 kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
1711
1712         if (!kctl) {
1713                 usb_audio_err(mixer->chip, "cannot malloc kcontrol\n");
1714                 usb_mixer_elem_info_free(cval);
1715                 return;
1716         }
1717         kctl->private_free = snd_usb_mixer_elem_free;
1718
1719         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
1720         mapped_name = len != 0;
1721         if (!len && nameid)
1722                 len = snd_usb_copy_string_desc(mixer->chip, nameid,
1723                                 kctl->id.name, sizeof(kctl->id.name));
1724
1725         switch (control) {
1726         case UAC_FU_MUTE:
1727         case UAC_FU_VOLUME:
1728                 /*
1729                  * determine the control name.  the rule is:
1730                  * - if a name id is given in descriptor, use it.
1731                  * - if the connected input can be determined, then use the name
1732                  *   of terminal type.
1733                  * - if the connected output can be determined, use it.
1734                  * - otherwise, anonymous name.
1735                  */
1736                 if (!len) {
1737                         if (iterm)
1738                                 len = get_term_name(mixer->chip, iterm,
1739                                                     kctl->id.name,
1740                                                     sizeof(kctl->id.name), 1);
1741                         if (!len && oterm)
1742                                 len = get_term_name(mixer->chip, oterm,
1743                                                     kctl->id.name,
1744                                                     sizeof(kctl->id.name), 1);
1745                         if (!len)
1746                                 snprintf(kctl->id.name, sizeof(kctl->id.name),
1747                                          "Feature %d", unitid);
1748                 }
1749
1750                 if (!mapped_name)
1751                         check_no_speaker_on_headset(kctl, mixer->chip->card);
1752
1753                 /*
1754                  * determine the stream direction:
1755                  * if the connected output is USB stream, then it's likely a
1756                  * capture stream.  otherwise it should be playback (hopefully :)
1757                  */
1758                 if (!mapped_name && oterm && !(oterm->type >> 16)) {
1759                         if ((oterm->type & 0xff00) == 0x0100)
1760                                 append_ctl_name(kctl, " Capture");
1761                         else
1762                                 append_ctl_name(kctl, " Playback");
1763                 }
1764                 append_ctl_name(kctl, control == UAC_FU_MUTE ?
1765                                 " Switch" : " Volume");
1766                 break;
1767         default:
1768                 if (!len)
1769                         strscpy(kctl->id.name, audio_feature_info[control-1].name,
1770                                 sizeof(kctl->id.name));
1771                 break;
1772         }
1773
1774         /* get min/max values */
1775         get_min_max_with_quirks(cval, 0, kctl);
1776
1777         /* skip a bogus volume range */
1778         if (cval->max <= cval->min) {
1779                 usb_audio_dbg(mixer->chip,
1780                               "[%d] FU [%s] skipped due to invalid volume\n",
1781                               cval->head.id, kctl->id.name);
1782                 snd_ctl_free_one(kctl);
1783                 return;
1784         }
1785
1786
1787         if (control == UAC_FU_VOLUME) {
1788                 check_mapped_dB(map, cval);
1789                 if (cval->dBmin < cval->dBmax || !cval->initialized) {
1790                         kctl->tlv.c = snd_usb_mixer_vol_tlv;
1791                         kctl->vd[0].access |=
1792                                 SNDRV_CTL_ELEM_ACCESS_TLV_READ |
1793                                 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
1794                 }
1795         }
1796
1797         snd_usb_mixer_fu_apply_quirk(mixer, cval, unitid, kctl);
1798
1799         range = (cval->max - cval->min) / cval->res;
1800         /*
1801          * Are there devices with volume range more than 255? I use a bit more
1802          * to be sure. 384 is a resolution magic number found on Logitech
1803          * devices. It will definitively catch all buggy Logitech devices.
1804          */
1805         if (range > 384) {
1806                 usb_audio_warn(mixer->chip,
1807                                "Warning! Unlikely big volume range (=%u), cval->res is probably wrong.",
1808                                range);
1809                 usb_audio_warn(mixer->chip,
1810                                "[%d] FU [%s] ch = %d, val = %d/%d/%d",
1811                                cval->head.id, kctl->id.name, cval->channels,
1812                                cval->min, cval->max, cval->res);
1813         }
1814
1815         usb_audio_dbg(mixer->chip, "[%d] FU [%s] ch = %d, val = %d/%d/%d\n",
1816                       cval->head.id, kctl->id.name, cval->channels,
1817                       cval->min, cval->max, cval->res);
1818         snd_usb_mixer_add_control(&cval->head, kctl);
1819 }
1820
1821 static void build_feature_ctl(struct mixer_build *state, void *raw_desc,
1822                               unsigned int ctl_mask, int control,
1823                               struct usb_audio_term *iterm, int unitid,
1824                               int readonly_mask)
1825 {
1826         struct uac_feature_unit_descriptor *desc = raw_desc;
1827         int nameid = uac_feature_unit_iFeature(desc);
1828
1829         __build_feature_ctl(state->mixer, state->map, ctl_mask, control,
1830                         iterm, &state->oterm, unitid, nameid, readonly_mask);
1831 }
1832
1833 static void build_feature_ctl_badd(struct usb_mixer_interface *mixer,
1834                               unsigned int ctl_mask, int control, int unitid,
1835                               const struct usbmix_name_map *badd_map)
1836 {
1837         __build_feature_ctl(mixer, badd_map, ctl_mask, control,
1838                         NULL, NULL, unitid, 0, 0);
1839 }
1840
1841 static void get_connector_control_name(struct usb_mixer_interface *mixer,
1842                                        struct usb_audio_term *term,
1843                                        bool is_input, char *name, int name_size)
1844 {
1845         int name_len = get_term_name(mixer->chip, term, name, name_size, 0);
1846
1847         if (name_len == 0)
1848                 strscpy(name, "Unknown", name_size);
1849
1850         /*
1851          *  sound/core/ctljack.c has a convention of naming jack controls
1852          * by ending in " Jack".  Make it slightly more useful by
1853          * indicating Input or Output after the terminal name.
1854          */
1855         if (is_input)
1856                 strlcat(name, " - Input Jack", name_size);
1857         else
1858                 strlcat(name, " - Output Jack", name_size);
1859 }
1860
1861 /* get connector value to "wake up" the USB audio */
1862 static int connector_mixer_resume(struct usb_mixer_elem_list *list)
1863 {
1864         struct usb_mixer_elem_info *cval = mixer_elem_list_to_info(list);
1865
1866         get_connector_value(cval, NULL, NULL);
1867         return 0;
1868 }
1869
1870 /* Build a mixer control for a UAC connector control (jack-detect) */
1871 static void build_connector_control(struct usb_mixer_interface *mixer,
1872                                     const struct usbmix_name_map *imap,
1873                                     struct usb_audio_term *term, bool is_input)
1874 {
1875         struct snd_kcontrol *kctl;
1876         struct usb_mixer_elem_info *cval;
1877         const struct usbmix_name_map *map;
1878
1879         map = find_map(imap, term->id, 0);
1880         if (check_ignored_ctl(map))
1881                 return;
1882
1883         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1884         if (!cval)
1885                 return;
1886         snd_usb_mixer_elem_init_std(&cval->head, mixer, term->id);
1887
1888         /* set up a specific resume callback */
1889         cval->head.resume = connector_mixer_resume;
1890
1891         /*
1892          * UAC2: The first byte from reading the UAC2_TE_CONNECTOR control returns the
1893          * number of channels connected.
1894          *
1895          * UAC3: The first byte specifies size of bitmap for the inserted controls. The
1896          * following byte(s) specifies which connectors are inserted.
1897          *
1898          * This boolean ctl will simply report if any channels are connected
1899          * or not.
1900          */
1901         if (mixer->protocol == UAC_VERSION_2)
1902                 cval->control = UAC2_TE_CONNECTOR;
1903         else /* UAC_VERSION_3 */
1904                 cval->control = UAC3_TE_INSERTION;
1905
1906         cval->val_type = USB_MIXER_BOOLEAN;
1907         cval->channels = 1; /* report true if any channel is connected */
1908         cval->min = 0;
1909         cval->max = 1;
1910         kctl = snd_ctl_new1(&usb_connector_ctl_ro, cval);
1911         if (!kctl) {
1912                 usb_audio_err(mixer->chip, "cannot malloc kcontrol\n");
1913                 usb_mixer_elem_info_free(cval);
1914                 return;
1915         }
1916
1917         if (check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name)))
1918                 strlcat(kctl->id.name, " Jack", sizeof(kctl->id.name));
1919         else
1920                 get_connector_control_name(mixer, term, is_input, kctl->id.name,
1921                                            sizeof(kctl->id.name));
1922         kctl->private_free = snd_usb_mixer_elem_free;
1923         snd_usb_mixer_add_control(&cval->head, kctl);
1924 }
1925
1926 static int parse_clock_source_unit(struct mixer_build *state, int unitid,
1927                                    void *_ftr)
1928 {
1929         struct uac_clock_source_descriptor *hdr = _ftr;
1930         struct usb_mixer_elem_info *cval;
1931         struct snd_kcontrol *kctl;
1932         int ret;
1933
1934         if (state->mixer->protocol != UAC_VERSION_2)
1935                 return -EINVAL;
1936
1937         /*
1938          * The only property of this unit we are interested in is the
1939          * clock source validity. If that isn't readable, just bail out.
1940          */
1941         if (!uac_v2v3_control_is_readable(hdr->bmControls,
1942                                       UAC2_CS_CONTROL_CLOCK_VALID))
1943                 return 0;
1944
1945         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1946         if (!cval)
1947                 return -ENOMEM;
1948
1949         snd_usb_mixer_elem_init_std(&cval->head, state->mixer, hdr->bClockID);
1950
1951         cval->min = 0;
1952         cval->max = 1;
1953         cval->channels = 1;
1954         cval->val_type = USB_MIXER_BOOLEAN;
1955         cval->control = UAC2_CS_CONTROL_CLOCK_VALID;
1956
1957         cval->master_readonly = 1;
1958         /* From UAC2 5.2.5.1.2 "Only the get request is supported." */
1959         kctl = snd_ctl_new1(&usb_bool_master_control_ctl_ro, cval);
1960
1961         if (!kctl) {
1962                 usb_mixer_elem_info_free(cval);
1963                 return -ENOMEM;
1964         }
1965
1966         kctl->private_free = snd_usb_mixer_elem_free;
1967         ret = snd_usb_copy_string_desc(state->chip, hdr->iClockSource,
1968                                        kctl->id.name, sizeof(kctl->id.name));
1969         if (ret > 0)
1970                 append_ctl_name(kctl, " Validity");
1971         else
1972                 snprintf(kctl->id.name, sizeof(kctl->id.name),
1973                          "Clock Source %d Validity", hdr->bClockID);
1974
1975         return snd_usb_mixer_add_control(&cval->head, kctl);
1976 }
1977
1978 /*
1979  * parse a feature unit
1980  *
1981  * most of controls are defined here.
1982  */
1983 static int parse_audio_feature_unit(struct mixer_build *state, int unitid,
1984                                     void *_ftr)
1985 {
1986         int channels, i, j;
1987         struct usb_audio_term iterm;
1988         unsigned int master_bits;
1989         int err, csize;
1990         struct uac_feature_unit_descriptor *hdr = _ftr;
1991         __u8 *bmaControls;
1992
1993         if (state->mixer->protocol == UAC_VERSION_1) {
1994                 csize = hdr->bControlSize;
1995                 channels = (hdr->bLength - 7) / csize - 1;
1996                 bmaControls = hdr->bmaControls;
1997         } else if (state->mixer->protocol == UAC_VERSION_2) {
1998                 struct uac2_feature_unit_descriptor *ftr = _ftr;
1999                 csize = 4;
2000                 channels = (hdr->bLength - 6) / 4 - 1;
2001                 bmaControls = ftr->bmaControls;
2002         } else { /* UAC_VERSION_3 */
2003                 struct uac3_feature_unit_descriptor *ftr = _ftr;
2004
2005                 csize = 4;
2006                 channels = (ftr->bLength - 7) / 4 - 1;
2007                 bmaControls = ftr->bmaControls;
2008         }
2009
2010         /* parse the source unit */
2011         err = parse_audio_unit(state, hdr->bSourceID);
2012         if (err < 0)
2013                 return err;
2014
2015         /* determine the input source type and name */
2016         err = check_input_term(state, hdr->bSourceID, &iterm);
2017         if (err < 0)
2018                 return err;
2019
2020         master_bits = snd_usb_combine_bytes(bmaControls, csize);
2021         /* master configuration quirks */
2022         switch (state->chip->usb_id) {
2023         case USB_ID(0x08bb, 0x2702):
2024                 usb_audio_info(state->chip,
2025                                "usbmixer: master volume quirk for PCM2702 chip\n");
2026                 /* disable non-functional volume control */
2027                 master_bits &= ~UAC_CONTROL_BIT(UAC_FU_VOLUME);
2028                 break;
2029         case USB_ID(0x1130, 0xf211):
2030                 usb_audio_info(state->chip,
2031                                "usbmixer: volume control quirk for Tenx TP6911 Audio Headset\n");
2032                 /* disable non-functional volume control */
2033                 channels = 0;
2034                 break;
2035
2036         }
2037
2038         if (state->mixer->protocol == UAC_VERSION_1) {
2039                 /* check all control types */
2040                 for (i = 0; i < 10; i++) {
2041                         unsigned int ch_bits = 0;
2042                         int control = audio_feature_info[i].control;
2043
2044                         for (j = 0; j < channels; j++) {
2045                                 unsigned int mask;
2046
2047                                 mask = snd_usb_combine_bytes(bmaControls +
2048                                                              csize * (j+1), csize);
2049                                 if (mask & (1 << i))
2050                                         ch_bits |= (1 << j);
2051                         }
2052                         /* audio class v1 controls are never read-only */
2053
2054                         /*
2055                          * The first channel must be set
2056                          * (for ease of programming).
2057                          */
2058                         if (ch_bits & 1)
2059                                 build_feature_ctl(state, _ftr, ch_bits, control,
2060                                                   &iterm, unitid, 0);
2061                         if (master_bits & (1 << i))
2062                                 build_feature_ctl(state, _ftr, 0, control,
2063                                                   &iterm, unitid, 0);
2064                 }
2065         } else { /* UAC_VERSION_2/3 */
2066                 for (i = 0; i < ARRAY_SIZE(audio_feature_info); i++) {
2067                         unsigned int ch_bits = 0;
2068                         unsigned int ch_read_only = 0;
2069                         int control = audio_feature_info[i].control;
2070
2071                         for (j = 0; j < channels; j++) {
2072                                 unsigned int mask;
2073
2074                                 mask = snd_usb_combine_bytes(bmaControls +
2075                                                              csize * (j+1), csize);
2076                                 if (uac_v2v3_control_is_readable(mask, control)) {
2077                                         ch_bits |= (1 << j);
2078                                         if (!uac_v2v3_control_is_writeable(mask, control))
2079                                                 ch_read_only |= (1 << j);
2080                                 }
2081                         }
2082
2083                         /*
2084                          * NOTE: build_feature_ctl() will mark the control
2085                          * read-only if all channels are marked read-only in
2086                          * the descriptors. Otherwise, the control will be
2087                          * reported as writeable, but the driver will not
2088                          * actually issue a write command for read-only
2089                          * channels.
2090                          */
2091
2092                         /*
2093                          * The first channel must be set
2094                          * (for ease of programming).
2095                          */
2096                         if (ch_bits & 1)
2097                                 build_feature_ctl(state, _ftr, ch_bits, control,
2098                                                   &iterm, unitid, ch_read_only);
2099                         if (uac_v2v3_control_is_readable(master_bits, control))
2100                                 build_feature_ctl(state, _ftr, 0, control,
2101                                                   &iterm, unitid,
2102                                                   !uac_v2v3_control_is_writeable(master_bits,
2103                                                                                  control));
2104                 }
2105         }
2106
2107         return 0;
2108 }
2109
2110 /*
2111  * Mixer Unit
2112  */
2113
2114 /* check whether the given in/out overflows bmMixerControls matrix */
2115 static bool mixer_bitmap_overflow(struct uac_mixer_unit_descriptor *desc,
2116                                   int protocol, int num_ins, int num_outs)
2117 {
2118         u8 *hdr = (u8 *)desc;
2119         u8 *c = uac_mixer_unit_bmControls(desc, protocol);
2120         size_t rest; /* remaining bytes after bmMixerControls */
2121
2122         switch (protocol) {
2123         case UAC_VERSION_1:
2124         default:
2125                 rest = 1; /* iMixer */
2126                 break;
2127         case UAC_VERSION_2:
2128                 rest = 2; /* bmControls + iMixer */
2129                 break;
2130         case UAC_VERSION_3:
2131                 rest = 6; /* bmControls + wMixerDescrStr */
2132                 break;
2133         }
2134
2135         /* overflow? */
2136         return c + (num_ins * num_outs + 7) / 8 + rest > hdr + hdr[0];
2137 }
2138
2139 /*
2140  * build a mixer unit control
2141  *
2142  * the callbacks are identical with feature unit.
2143  * input channel number (zero based) is given in control field instead.
2144  */
2145 static void build_mixer_unit_ctl(struct mixer_build *state,
2146                                  struct uac_mixer_unit_descriptor *desc,
2147                                  int in_pin, int in_ch, int num_outs,
2148                                  int unitid, struct usb_audio_term *iterm)
2149 {
2150         struct usb_mixer_elem_info *cval;
2151         unsigned int i, len;
2152         struct snd_kcontrol *kctl;
2153         const struct usbmix_name_map *map;
2154
2155         map = find_map(state->map, unitid, 0);
2156         if (check_ignored_ctl(map))
2157                 return;
2158
2159         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
2160         if (!cval)
2161                 return;
2162
2163         snd_usb_mixer_elem_init_std(&cval->head, state->mixer, unitid);
2164         cval->control = in_ch + 1; /* based on 1 */
2165         cval->val_type = USB_MIXER_S16;
2166         for (i = 0; i < num_outs; i++) {
2167                 __u8 *c = uac_mixer_unit_bmControls(desc, state->mixer->protocol);
2168
2169                 if (check_matrix_bitmap(c, in_ch, i, num_outs)) {
2170                         cval->cmask |= (1 << i);
2171                         cval->channels++;
2172                 }
2173         }
2174
2175         /* get min/max values */
2176         get_min_max(cval, 0);
2177
2178         kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
2179         if (!kctl) {
2180                 usb_audio_err(state->chip, "cannot malloc kcontrol\n");
2181                 usb_mixer_elem_info_free(cval);
2182                 return;
2183         }
2184         kctl->private_free = snd_usb_mixer_elem_free;
2185
2186         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
2187         if (!len)
2188                 len = get_term_name(state->chip, iterm, kctl->id.name,
2189                                     sizeof(kctl->id.name), 0);
2190         if (!len)
2191                 len = sprintf(kctl->id.name, "Mixer Source %d", in_ch + 1);
2192         append_ctl_name(kctl, " Volume");
2193
2194         usb_audio_dbg(state->chip, "[%d] MU [%s] ch = %d, val = %d/%d\n",
2195                     cval->head.id, kctl->id.name, cval->channels, cval->min, cval->max);
2196         snd_usb_mixer_add_control(&cval->head, kctl);
2197 }
2198
2199 static int parse_audio_input_terminal(struct mixer_build *state, int unitid,
2200                                       void *raw_desc)
2201 {
2202         struct usb_audio_term iterm;
2203         unsigned int control, bmctls, term_id;
2204
2205         if (state->mixer->protocol == UAC_VERSION_2) {
2206                 struct uac2_input_terminal_descriptor *d_v2 = raw_desc;
2207                 control = UAC2_TE_CONNECTOR;
2208                 term_id = d_v2->bTerminalID;
2209                 bmctls = le16_to_cpu(d_v2->bmControls);
2210         } else if (state->mixer->protocol == UAC_VERSION_3) {
2211                 struct uac3_input_terminal_descriptor *d_v3 = raw_desc;
2212                 control = UAC3_TE_INSERTION;
2213                 term_id = d_v3->bTerminalID;
2214                 bmctls = le32_to_cpu(d_v3->bmControls);
2215         } else {
2216                 return 0; /* UAC1. No Insertion control */
2217         }
2218
2219         check_input_term(state, term_id, &iterm);
2220
2221         /* Check for jack detection. */
2222         if ((iterm.type & 0xff00) != 0x0100 &&
2223             uac_v2v3_control_is_readable(bmctls, control))
2224                 build_connector_control(state->mixer, state->map, &iterm, true);
2225
2226         return 0;
2227 }
2228
2229 /*
2230  * parse a mixer unit
2231  */
2232 static int parse_audio_mixer_unit(struct mixer_build *state, int unitid,
2233                                   void *raw_desc)
2234 {
2235         struct uac_mixer_unit_descriptor *desc = raw_desc;
2236         struct usb_audio_term iterm;
2237         int input_pins, num_ins, num_outs;
2238         int pin, ich, err;
2239
2240         err = uac_mixer_unit_get_channels(state, desc);
2241         if (err < 0) {
2242                 usb_audio_err(state->chip,
2243                               "invalid MIXER UNIT descriptor %d\n",
2244                               unitid);
2245                 return err;
2246         }
2247
2248         num_outs = err;
2249         input_pins = desc->bNrInPins;
2250
2251         num_ins = 0;
2252         ich = 0;
2253         for (pin = 0; pin < input_pins; pin++) {
2254                 err = parse_audio_unit(state, desc->baSourceID[pin]);
2255                 if (err < 0)
2256                         continue;
2257                 /* no bmControls field (e.g. Maya44) -> ignore */
2258                 if (!num_outs)
2259                         continue;
2260                 err = check_input_term(state, desc->baSourceID[pin], &iterm);
2261                 if (err < 0)
2262                         return err;
2263                 num_ins += iterm.channels;
2264                 if (mixer_bitmap_overflow(desc, state->mixer->protocol,
2265                                           num_ins, num_outs))
2266                         break;
2267                 for (; ich < num_ins; ich++) {
2268                         int och, ich_has_controls = 0;
2269
2270                         for (och = 0; och < num_outs; och++) {
2271                                 __u8 *c = uac_mixer_unit_bmControls(desc,
2272                                                 state->mixer->protocol);
2273
2274                                 if (check_matrix_bitmap(c, ich, och, num_outs)) {
2275                                         ich_has_controls = 1;
2276                                         break;
2277                                 }
2278                         }
2279                         if (ich_has_controls)
2280                                 build_mixer_unit_ctl(state, desc, pin, ich, num_outs,
2281                                                      unitid, &iterm);
2282                 }
2283         }
2284         return 0;
2285 }
2286
2287 /*
2288  * Processing Unit / Extension Unit
2289  */
2290
2291 /* get callback for processing/extension unit */
2292 static int mixer_ctl_procunit_get(struct snd_kcontrol *kcontrol,
2293                                   struct snd_ctl_elem_value *ucontrol)
2294 {
2295         struct usb_mixer_elem_info *cval = kcontrol->private_data;
2296         int err, val;
2297
2298         err = get_cur_ctl_value(cval, cval->control << 8, &val);
2299         if (err < 0) {
2300                 ucontrol->value.integer.value[0] = cval->min;
2301                 return filter_error(cval, err);
2302         }
2303         val = get_relative_value(cval, val);
2304         ucontrol->value.integer.value[0] = val;
2305         return 0;
2306 }
2307
2308 /* put callback for processing/extension unit */
2309 static int mixer_ctl_procunit_put(struct snd_kcontrol *kcontrol,
2310                                   struct snd_ctl_elem_value *ucontrol)
2311 {
2312         struct usb_mixer_elem_info *cval = kcontrol->private_data;
2313         int val, oval, err;
2314
2315         err = get_cur_ctl_value(cval, cval->control << 8, &oval);
2316         if (err < 0)
2317                 return filter_error(cval, err);
2318         val = ucontrol->value.integer.value[0];
2319         val = get_abs_value(cval, val);
2320         if (val != oval) {
2321                 set_cur_ctl_value(cval, cval->control << 8, val);
2322                 return 1;
2323         }
2324         return 0;
2325 }
2326
2327 /* alsa control interface for processing/extension unit */
2328 static const struct snd_kcontrol_new mixer_procunit_ctl = {
2329         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
2330         .name = "", /* will be filled later */
2331         .info = mixer_ctl_feature_info,
2332         .get = mixer_ctl_procunit_get,
2333         .put = mixer_ctl_procunit_put,
2334 };
2335
2336 /*
2337  * predefined data for processing units
2338  */
2339 struct procunit_value_info {
2340         int control;
2341         const char *suffix;
2342         int val_type;
2343         int min_value;
2344 };
2345
2346 struct procunit_info {
2347         int type;
2348         char *name;
2349         const struct procunit_value_info *values;
2350 };
2351
2352 static const struct procunit_value_info undefined_proc_info[] = {
2353         { 0x00, "Control Undefined", 0 },
2354         { 0 }
2355 };
2356
2357 static const struct procunit_value_info updown_proc_info[] = {
2358         { UAC_UD_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2359         { UAC_UD_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
2360         { 0 }
2361 };
2362 static const struct procunit_value_info prologic_proc_info[] = {
2363         { UAC_DP_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2364         { UAC_DP_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
2365         { 0 }
2366 };
2367 static const struct procunit_value_info threed_enh_proc_info[] = {
2368         { UAC_3D_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2369         { UAC_3D_SPACE, "Spaciousness", USB_MIXER_U8 },
2370         { 0 }
2371 };
2372 static const struct procunit_value_info reverb_proc_info[] = {
2373         { UAC_REVERB_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2374         { UAC_REVERB_LEVEL, "Level", USB_MIXER_U8 },
2375         { UAC_REVERB_TIME, "Time", USB_MIXER_U16 },
2376         { UAC_REVERB_FEEDBACK, "Feedback", USB_MIXER_U8 },
2377         { 0 }
2378 };
2379 static const struct procunit_value_info chorus_proc_info[] = {
2380         { UAC_CHORUS_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2381         { UAC_CHORUS_LEVEL, "Level", USB_MIXER_U8 },
2382         { UAC_CHORUS_RATE, "Rate", USB_MIXER_U16 },
2383         { UAC_CHORUS_DEPTH, "Depth", USB_MIXER_U16 },
2384         { 0 }
2385 };
2386 static const struct procunit_value_info dcr_proc_info[] = {
2387         { UAC_DCR_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2388         { UAC_DCR_RATE, "Ratio", USB_MIXER_U16 },
2389         { UAC_DCR_MAXAMPL, "Max Amp", USB_MIXER_S16 },
2390         { UAC_DCR_THRESHOLD, "Threshold", USB_MIXER_S16 },
2391         { UAC_DCR_ATTACK_TIME, "Attack Time", USB_MIXER_U16 },
2392         { UAC_DCR_RELEASE_TIME, "Release Time", USB_MIXER_U16 },
2393         { 0 }
2394 };
2395
2396 static const struct procunit_info procunits[] = {
2397         { UAC_PROCESS_UP_DOWNMIX, "Up Down", updown_proc_info },
2398         { UAC_PROCESS_DOLBY_PROLOGIC, "Dolby Prologic", prologic_proc_info },
2399         { UAC_PROCESS_STEREO_EXTENDER, "3D Stereo Extender", threed_enh_proc_info },
2400         { UAC_PROCESS_REVERB, "Reverb", reverb_proc_info },
2401         { UAC_PROCESS_CHORUS, "Chorus", chorus_proc_info },
2402         { UAC_PROCESS_DYN_RANGE_COMP, "DCR", dcr_proc_info },
2403         { 0 },
2404 };
2405
2406 static const struct procunit_value_info uac3_updown_proc_info[] = {
2407         { UAC3_UD_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
2408         { 0 }
2409 };
2410 static const struct procunit_value_info uac3_stereo_ext_proc_info[] = {
2411         { UAC3_EXT_WIDTH_CONTROL, "Width Control", USB_MIXER_U8 },
2412         { 0 }
2413 };
2414
2415 static const struct procunit_info uac3_procunits[] = {
2416         { UAC3_PROCESS_UP_DOWNMIX, "Up Down", uac3_updown_proc_info },
2417         { UAC3_PROCESS_STEREO_EXTENDER, "3D Stereo Extender", uac3_stereo_ext_proc_info },
2418         { UAC3_PROCESS_MULTI_FUNCTION, "Multi-Function", undefined_proc_info },
2419         { 0 },
2420 };
2421
2422 /*
2423  * predefined data for extension units
2424  */
2425 static const struct procunit_value_info clock_rate_xu_info[] = {
2426         { USB_XU_CLOCK_RATE_SELECTOR, "Selector", USB_MIXER_U8, 0 },
2427         { 0 }
2428 };
2429 static const struct procunit_value_info clock_source_xu_info[] = {
2430         { USB_XU_CLOCK_SOURCE_SELECTOR, "External", USB_MIXER_BOOLEAN },
2431         { 0 }
2432 };
2433 static const struct procunit_value_info spdif_format_xu_info[] = {
2434         { USB_XU_DIGITAL_FORMAT_SELECTOR, "SPDIF/AC3", USB_MIXER_BOOLEAN },
2435         { 0 }
2436 };
2437 static const struct procunit_value_info soft_limit_xu_info[] = {
2438         { USB_XU_SOFT_LIMIT_SELECTOR, " ", USB_MIXER_BOOLEAN },
2439         { 0 }
2440 };
2441 static const struct procunit_info extunits[] = {
2442         { USB_XU_CLOCK_RATE, "Clock rate", clock_rate_xu_info },
2443         { USB_XU_CLOCK_SOURCE, "DigitalIn CLK source", clock_source_xu_info },
2444         { USB_XU_DIGITAL_IO_STATUS, "DigitalOut format:", spdif_format_xu_info },
2445         { USB_XU_DEVICE_OPTIONS, "AnalogueIn Soft Limit", soft_limit_xu_info },
2446         { 0 }
2447 };
2448
2449 /*
2450  * build a processing/extension unit
2451  */
2452 static int build_audio_procunit(struct mixer_build *state, int unitid,
2453                                 void *raw_desc, const struct procunit_info *list,
2454                                 bool extension_unit)
2455 {
2456         struct uac_processing_unit_descriptor *desc = raw_desc;
2457         int num_ins;
2458         struct usb_mixer_elem_info *cval;
2459         struct snd_kcontrol *kctl;
2460         int i, err, nameid, type, len, val;
2461         const struct procunit_info *info;
2462         const struct procunit_value_info *valinfo;
2463         const struct usbmix_name_map *map;
2464         static const struct procunit_value_info default_value_info[] = {
2465                 { 0x01, "Switch", USB_MIXER_BOOLEAN },
2466                 { 0 }
2467         };
2468         static const struct procunit_info default_info = {
2469                 0, NULL, default_value_info
2470         };
2471         const char *name = extension_unit ?
2472                 "Extension Unit" : "Processing Unit";
2473
2474         num_ins = desc->bNrInPins;
2475         for (i = 0; i < num_ins; i++) {
2476                 err = parse_audio_unit(state, desc->baSourceID[i]);
2477                 if (err < 0)
2478                         return err;
2479         }
2480
2481         type = le16_to_cpu(desc->wProcessType);
2482         for (info = list; info && info->type; info++)
2483                 if (info->type == type)
2484                         break;
2485         if (!info || !info->type)
2486                 info = &default_info;
2487
2488         for (valinfo = info->values; valinfo->control; valinfo++) {
2489                 __u8 *controls = uac_processing_unit_bmControls(desc, state->mixer->protocol);
2490
2491                 if (state->mixer->protocol == UAC_VERSION_1) {
2492                         if (!(controls[valinfo->control / 8] &
2493                                         (1 << ((valinfo->control % 8) - 1))))
2494                                 continue;
2495                 } else { /* UAC_VERSION_2/3 */
2496                         if (!uac_v2v3_control_is_readable(controls[valinfo->control / 8],
2497                                                           valinfo->control))
2498                                 continue;
2499                 }
2500
2501                 map = find_map(state->map, unitid, valinfo->control);
2502                 if (check_ignored_ctl(map))
2503                         continue;
2504                 cval = kzalloc(sizeof(*cval), GFP_KERNEL);
2505                 if (!cval)
2506                         return -ENOMEM;
2507                 snd_usb_mixer_elem_init_std(&cval->head, state->mixer, unitid);
2508                 cval->control = valinfo->control;
2509                 cval->val_type = valinfo->val_type;
2510                 cval->channels = 1;
2511
2512                 if (state->mixer->protocol > UAC_VERSION_1 &&
2513                     !uac_v2v3_control_is_writeable(controls[valinfo->control / 8],
2514                                                    valinfo->control))
2515                         cval->master_readonly = 1;
2516
2517                 /* get min/max values */
2518                 switch (type) {
2519                 case UAC_PROCESS_UP_DOWNMIX: {
2520                         bool mode_sel = false;
2521
2522                         switch (state->mixer->protocol) {
2523                         case UAC_VERSION_1:
2524                         case UAC_VERSION_2:
2525                         default:
2526                                 if (cval->control == UAC_UD_MODE_SELECT)
2527                                         mode_sel = true;
2528                                 break;
2529                         case UAC_VERSION_3:
2530                                 if (cval->control == UAC3_UD_MODE_SELECT)
2531                                         mode_sel = true;
2532                                 break;
2533                         }
2534
2535                         if (mode_sel) {
2536                                 __u8 *control_spec = uac_processing_unit_specific(desc,
2537                                                                 state->mixer->protocol);
2538                                 cval->min = 1;
2539                                 cval->max = control_spec[0];
2540                                 cval->res = 1;
2541                                 cval->initialized = 1;
2542                                 break;
2543                         }
2544
2545                         get_min_max(cval, valinfo->min_value);
2546                         break;
2547                 }
2548                 case USB_XU_CLOCK_RATE:
2549                         /*
2550                          * E-Mu USB 0404/0202/TrackerPre/0204
2551                          * samplerate control quirk
2552                          */
2553                         cval->min = 0;
2554                         cval->max = 5;
2555                         cval->res = 1;
2556                         cval->initialized = 1;
2557                         break;
2558                 default:
2559                         get_min_max(cval, valinfo->min_value);
2560                         break;
2561                 }
2562
2563                 err = get_cur_ctl_value(cval, cval->control << 8, &val);
2564                 if (err < 0) {
2565                         usb_mixer_elem_info_free(cval);
2566                         return -EINVAL;
2567                 }
2568
2569                 kctl = snd_ctl_new1(&mixer_procunit_ctl, cval);
2570                 if (!kctl) {
2571                         usb_mixer_elem_info_free(cval);
2572                         return -ENOMEM;
2573                 }
2574                 kctl->private_free = snd_usb_mixer_elem_free;
2575
2576                 if (check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name))) {
2577                         /* nothing */ ;
2578                 } else if (info->name) {
2579                         strscpy(kctl->id.name, info->name, sizeof(kctl->id.name));
2580                 } else {
2581                         if (extension_unit)
2582                                 nameid = uac_extension_unit_iExtension(desc, state->mixer->protocol);
2583                         else
2584                                 nameid = uac_processing_unit_iProcessing(desc, state->mixer->protocol);
2585                         len = 0;
2586                         if (nameid)
2587                                 len = snd_usb_copy_string_desc(state->chip,
2588                                                                nameid,
2589                                                                kctl->id.name,
2590                                                                sizeof(kctl->id.name));
2591                         if (!len)
2592                                 strscpy(kctl->id.name, name, sizeof(kctl->id.name));
2593                 }
2594                 append_ctl_name(kctl, " ");
2595                 append_ctl_name(kctl, valinfo->suffix);
2596
2597                 usb_audio_dbg(state->chip,
2598                               "[%d] PU [%s] ch = %d, val = %d/%d\n",
2599                               cval->head.id, kctl->id.name, cval->channels,
2600                               cval->min, cval->max);
2601
2602                 err = snd_usb_mixer_add_control(&cval->head, kctl);
2603                 if (err < 0)
2604                         return err;
2605         }
2606         return 0;
2607 }
2608
2609 static int parse_audio_processing_unit(struct mixer_build *state, int unitid,
2610                                        void *raw_desc)
2611 {
2612         switch (state->mixer->protocol) {
2613         case UAC_VERSION_1:
2614         case UAC_VERSION_2:
2615         default:
2616                 return build_audio_procunit(state, unitid, raw_desc,
2617                                             procunits, false);
2618         case UAC_VERSION_3:
2619                 return build_audio_procunit(state, unitid, raw_desc,
2620                                             uac3_procunits, false);
2621         }
2622 }
2623
2624 static int parse_audio_extension_unit(struct mixer_build *state, int unitid,
2625                                       void *raw_desc)
2626 {
2627         /*
2628          * Note that we parse extension units with processing unit descriptors.
2629          * That's ok as the layout is the same.
2630          */
2631         return build_audio_procunit(state, unitid, raw_desc, extunits, true);
2632 }
2633
2634 /*
2635  * Selector Unit
2636  */
2637
2638 /*
2639  * info callback for selector unit
2640  * use an enumerator type for routing
2641  */
2642 static int mixer_ctl_selector_info(struct snd_kcontrol *kcontrol,
2643                                    struct snd_ctl_elem_info *uinfo)
2644 {
2645         struct usb_mixer_elem_info *cval = kcontrol->private_data;
2646         const char **itemlist = (const char **)kcontrol->private_value;
2647
2648         if (snd_BUG_ON(!itemlist))
2649                 return -EINVAL;
2650         return snd_ctl_enum_info(uinfo, 1, cval->max, itemlist);
2651 }
2652
2653 /* get callback for selector unit */
2654 static int mixer_ctl_selector_get(struct snd_kcontrol *kcontrol,
2655                                   struct snd_ctl_elem_value *ucontrol)
2656 {
2657         struct usb_mixer_elem_info *cval = kcontrol->private_data;
2658         int val, err;
2659
2660         err = get_cur_ctl_value(cval, cval->control << 8, &val);
2661         if (err < 0) {
2662                 ucontrol->value.enumerated.item[0] = 0;
2663                 return filter_error(cval, err);
2664         }
2665         val = get_relative_value(cval, val);
2666         ucontrol->value.enumerated.item[0] = val;
2667         return 0;
2668 }
2669
2670 /* put callback for selector unit */
2671 static int mixer_ctl_selector_put(struct snd_kcontrol *kcontrol,
2672                                   struct snd_ctl_elem_value *ucontrol)
2673 {
2674         struct usb_mixer_elem_info *cval = kcontrol->private_data;
2675         int val, oval, err;
2676
2677         err = get_cur_ctl_value(cval, cval->control << 8, &oval);
2678         if (err < 0)
2679                 return filter_error(cval, err);
2680         val = ucontrol->value.enumerated.item[0];
2681         val = get_abs_value(cval, val);
2682         if (val != oval) {
2683                 set_cur_ctl_value(cval, cval->control << 8, val);
2684                 return 1;
2685         }
2686         return 0;
2687 }
2688
2689 /* alsa control interface for selector unit */
2690 static const struct snd_kcontrol_new mixer_selectunit_ctl = {
2691         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
2692         .name = "", /* will be filled later */
2693         .info = mixer_ctl_selector_info,
2694         .get = mixer_ctl_selector_get,
2695         .put = mixer_ctl_selector_put,
2696 };
2697
2698 /*
2699  * private free callback.
2700  * free both private_data and private_value
2701  */
2702 static void usb_mixer_selector_elem_free(struct snd_kcontrol *kctl)
2703 {
2704         int i, num_ins = 0;
2705
2706         if (kctl->private_data) {
2707                 struct usb_mixer_elem_info *cval = kctl->private_data;
2708                 num_ins = cval->max;
2709                 usb_mixer_elem_info_free(cval);
2710                 kctl->private_data = NULL;
2711         }
2712         if (kctl->private_value) {
2713                 char **itemlist = (char **)kctl->private_value;
2714                 for (i = 0; i < num_ins; i++)
2715                         kfree(itemlist[i]);
2716                 kfree(itemlist);
2717                 kctl->private_value = 0;
2718         }
2719 }
2720
2721 /*
2722  * parse a selector unit
2723  */
2724 static int parse_audio_selector_unit(struct mixer_build *state, int unitid,
2725                                      void *raw_desc)
2726 {
2727         struct uac_selector_unit_descriptor *desc = raw_desc;
2728         unsigned int i, nameid, len;
2729         int err;
2730         struct usb_mixer_elem_info *cval;
2731         struct snd_kcontrol *kctl;
2732         const struct usbmix_name_map *map;
2733         char **namelist;
2734
2735         for (i = 0; i < desc->bNrInPins; i++) {
2736                 err = parse_audio_unit(state, desc->baSourceID[i]);
2737                 if (err < 0)
2738                         return err;
2739         }
2740
2741         if (desc->bNrInPins == 1) /* only one ? nonsense! */
2742                 return 0;
2743
2744         map = find_map(state->map, unitid, 0);
2745         if (check_ignored_ctl(map))
2746                 return 0;
2747
2748         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
2749         if (!cval)
2750                 return -ENOMEM;
2751         snd_usb_mixer_elem_init_std(&cval->head, state->mixer, unitid);
2752         cval->val_type = USB_MIXER_U8;
2753         cval->channels = 1;
2754         cval->min = 1;
2755         cval->max = desc->bNrInPins;
2756         cval->res = 1;
2757         cval->initialized = 1;
2758
2759         switch (state->mixer->protocol) {
2760         case UAC_VERSION_1:
2761         default:
2762                 cval->control = 0;
2763                 break;
2764         case UAC_VERSION_2:
2765         case UAC_VERSION_3:
2766                 if (desc->bDescriptorSubtype == UAC2_CLOCK_SELECTOR ||
2767                     desc->bDescriptorSubtype == UAC3_CLOCK_SELECTOR)
2768                         cval->control = UAC2_CX_CLOCK_SELECTOR;
2769                 else /* UAC2/3_SELECTOR_UNIT */
2770                         cval->control = UAC2_SU_SELECTOR;
2771                 break;
2772         }
2773
2774         namelist = kcalloc(desc->bNrInPins, sizeof(char *), GFP_KERNEL);
2775         if (!namelist) {
2776                 err = -ENOMEM;
2777                 goto error_cval;
2778         }
2779 #define MAX_ITEM_NAME_LEN       64
2780         for (i = 0; i < desc->bNrInPins; i++) {
2781                 struct usb_audio_term iterm;
2782                 namelist[i] = kmalloc(MAX_ITEM_NAME_LEN, GFP_KERNEL);
2783                 if (!namelist[i]) {
2784                         err = -ENOMEM;
2785                         goto error_name;
2786                 }
2787                 len = check_mapped_selector_name(state, unitid, i, namelist[i],
2788                                                  MAX_ITEM_NAME_LEN);
2789                 if (! len && check_input_term(state, desc->baSourceID[i], &iterm) >= 0)
2790                         len = get_term_name(state->chip, &iterm, namelist[i],
2791                                             MAX_ITEM_NAME_LEN, 0);
2792                 if (! len)
2793                         sprintf(namelist[i], "Input %u", i);
2794         }
2795
2796         kctl = snd_ctl_new1(&mixer_selectunit_ctl, cval);
2797         if (! kctl) {
2798                 usb_audio_err(state->chip, "cannot malloc kcontrol\n");
2799                 err = -ENOMEM;
2800                 goto error_name;
2801         }
2802         kctl->private_value = (unsigned long)namelist;
2803         kctl->private_free = usb_mixer_selector_elem_free;
2804
2805         /* check the static mapping table at first */
2806         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
2807         if (!len) {
2808                 /* no mapping ? */
2809                 switch (state->mixer->protocol) {
2810                 case UAC_VERSION_1:
2811                 case UAC_VERSION_2:
2812                 default:
2813                 /* if iSelector is given, use it */
2814                         nameid = uac_selector_unit_iSelector(desc);
2815                         if (nameid)
2816                                 len = snd_usb_copy_string_desc(state->chip,
2817                                                         nameid, kctl->id.name,
2818                                                         sizeof(kctl->id.name));
2819                         break;
2820                 case UAC_VERSION_3:
2821                         /* TODO: Class-Specific strings not yet supported */
2822                         break;
2823                 }
2824
2825                 /* ... or pick up the terminal name at next */
2826                 if (!len)
2827                         len = get_term_name(state->chip, &state->oterm,
2828                                     kctl->id.name, sizeof(kctl->id.name), 0);
2829                 /* ... or use the fixed string "USB" as the last resort */
2830                 if (!len)
2831                         strscpy(kctl->id.name, "USB", sizeof(kctl->id.name));
2832
2833                 /* and add the proper suffix */
2834                 if (desc->bDescriptorSubtype == UAC2_CLOCK_SELECTOR ||
2835                     desc->bDescriptorSubtype == UAC3_CLOCK_SELECTOR)
2836                         append_ctl_name(kctl, " Clock Source");
2837                 else if ((state->oterm.type & 0xff00) == 0x0100)
2838                         append_ctl_name(kctl, " Capture Source");
2839                 else
2840                         append_ctl_name(kctl, " Playback Source");
2841         }
2842
2843         usb_audio_dbg(state->chip, "[%d] SU [%s] items = %d\n",
2844                     cval->head.id, kctl->id.name, desc->bNrInPins);
2845         return snd_usb_mixer_add_control(&cval->head, kctl);
2846
2847  error_name:
2848         for (i = 0; i < desc->bNrInPins; i++)
2849                 kfree(namelist[i]);
2850         kfree(namelist);
2851  error_cval:
2852         usb_mixer_elem_info_free(cval);
2853         return err;
2854 }
2855
2856 /*
2857  * parse an audio unit recursively
2858  */
2859
2860 static int parse_audio_unit(struct mixer_build *state, int unitid)
2861 {
2862         unsigned char *p1;
2863         int protocol = state->mixer->protocol;
2864
2865         if (test_and_set_bit(unitid, state->unitbitmap))
2866                 return 0; /* the unit already visited */
2867
2868         p1 = find_audio_control_unit(state, unitid);
2869         if (!p1) {
2870                 usb_audio_err(state->chip, "unit %d not found!\n", unitid);
2871                 return -EINVAL;
2872         }
2873
2874         if (!snd_usb_validate_audio_desc(p1, protocol)) {
2875                 usb_audio_dbg(state->chip, "invalid unit %d\n", unitid);
2876                 return 0; /* skip invalid unit */
2877         }
2878
2879         switch (PTYPE(protocol, p1[2])) {
2880         case PTYPE(UAC_VERSION_1, UAC_INPUT_TERMINAL):
2881         case PTYPE(UAC_VERSION_2, UAC_INPUT_TERMINAL):
2882         case PTYPE(UAC_VERSION_3, UAC_INPUT_TERMINAL):
2883                 return parse_audio_input_terminal(state, unitid, p1);
2884         case PTYPE(UAC_VERSION_1, UAC_MIXER_UNIT):
2885         case PTYPE(UAC_VERSION_2, UAC_MIXER_UNIT):
2886         case PTYPE(UAC_VERSION_3, UAC3_MIXER_UNIT):
2887                 return parse_audio_mixer_unit(state, unitid, p1);
2888         case PTYPE(UAC_VERSION_2, UAC2_CLOCK_SOURCE):
2889         case PTYPE(UAC_VERSION_3, UAC3_CLOCK_SOURCE):
2890                 return parse_clock_source_unit(state, unitid, p1);
2891         case PTYPE(UAC_VERSION_1, UAC_SELECTOR_UNIT):
2892         case PTYPE(UAC_VERSION_2, UAC_SELECTOR_UNIT):
2893         case PTYPE(UAC_VERSION_3, UAC3_SELECTOR_UNIT):
2894         case PTYPE(UAC_VERSION_2, UAC2_CLOCK_SELECTOR):
2895         case PTYPE(UAC_VERSION_3, UAC3_CLOCK_SELECTOR):
2896                 return parse_audio_selector_unit(state, unitid, p1);
2897         case PTYPE(UAC_VERSION_1, UAC_FEATURE_UNIT):
2898         case PTYPE(UAC_VERSION_2, UAC_FEATURE_UNIT):
2899         case PTYPE(UAC_VERSION_3, UAC3_FEATURE_UNIT):
2900                 return parse_audio_feature_unit(state, unitid, p1);
2901         case PTYPE(UAC_VERSION_1, UAC1_PROCESSING_UNIT):
2902         case PTYPE(UAC_VERSION_2, UAC2_PROCESSING_UNIT_V2):
2903         case PTYPE(UAC_VERSION_3, UAC3_PROCESSING_UNIT):
2904                 return parse_audio_processing_unit(state, unitid, p1);
2905         case PTYPE(UAC_VERSION_1, UAC1_EXTENSION_UNIT):
2906         case PTYPE(UAC_VERSION_2, UAC2_EXTENSION_UNIT_V2):
2907         case PTYPE(UAC_VERSION_3, UAC3_EXTENSION_UNIT):
2908                 return parse_audio_extension_unit(state, unitid, p1);
2909         case PTYPE(UAC_VERSION_2, UAC2_EFFECT_UNIT):
2910         case PTYPE(UAC_VERSION_3, UAC3_EFFECT_UNIT):
2911                 return 0; /* FIXME - effect units not implemented yet */
2912         default:
2913                 usb_audio_err(state->chip,
2914                               "unit %u: unexpected type 0x%02x\n",
2915                               unitid, p1[2]);
2916                 return -EINVAL;
2917         }
2918 }
2919
2920 static void snd_usb_mixer_free(struct usb_mixer_interface *mixer)
2921 {
2922         /* kill pending URBs */
2923         snd_usb_mixer_disconnect(mixer);
2924
2925         kfree(mixer->id_elems);
2926         if (mixer->urb) {
2927                 kfree(mixer->urb->transfer_buffer);
2928                 usb_free_urb(mixer->urb);
2929         }
2930         usb_free_urb(mixer->rc_urb);
2931         kfree(mixer->rc_setup_packet);
2932         kfree(mixer);
2933 }
2934
2935 static int snd_usb_mixer_dev_free(struct snd_device *device)
2936 {
2937         struct usb_mixer_interface *mixer = device->device_data;
2938         snd_usb_mixer_free(mixer);
2939         return 0;
2940 }
2941
2942 /* UAC3 predefined channels configuration */
2943 struct uac3_badd_profile {
2944         int subclass;
2945         const char *name;
2946         int c_chmask;   /* capture channels mask */
2947         int p_chmask;   /* playback channels mask */
2948         int st_chmask;  /* side tone mixing channel mask */
2949 };
2950
2951 static const struct uac3_badd_profile uac3_badd_profiles[] = {
2952         {
2953                 /*
2954                  * BAIF, BAOF or combination of both
2955                  * IN: Mono or Stereo cfg, Mono alt possible
2956                  * OUT: Mono or Stereo cfg, Mono alt possible
2957                  */
2958                 .subclass = UAC3_FUNCTION_SUBCLASS_GENERIC_IO,
2959                 .name = "GENERIC IO",
2960                 .c_chmask = -1,         /* dynamic channels */
2961                 .p_chmask = -1,         /* dynamic channels */
2962         },
2963         {
2964                 /* BAOF; Stereo only cfg, Mono alt possible */
2965                 .subclass = UAC3_FUNCTION_SUBCLASS_HEADPHONE,
2966                 .name = "HEADPHONE",
2967                 .p_chmask = 3,
2968         },
2969         {
2970                 /* BAOF; Mono or Stereo cfg, Mono alt possible */
2971                 .subclass = UAC3_FUNCTION_SUBCLASS_SPEAKER,
2972                 .name = "SPEAKER",
2973                 .p_chmask = -1,         /* dynamic channels */
2974         },
2975         {
2976                 /* BAIF; Mono or Stereo cfg, Mono alt possible */
2977                 .subclass = UAC3_FUNCTION_SUBCLASS_MICROPHONE,
2978                 .name = "MICROPHONE",
2979                 .c_chmask = -1,         /* dynamic channels */
2980         },
2981         {
2982                 /*
2983                  * BAIOF topology
2984                  * IN: Mono only
2985                  * OUT: Mono or Stereo cfg, Mono alt possible
2986                  */
2987                 .subclass = UAC3_FUNCTION_SUBCLASS_HEADSET,
2988                 .name = "HEADSET",
2989                 .c_chmask = 1,
2990                 .p_chmask = -1,         /* dynamic channels */
2991                 .st_chmask = 1,
2992         },
2993         {
2994                 /* BAIOF; IN: Mono only; OUT: Stereo only, Mono alt possible */
2995                 .subclass = UAC3_FUNCTION_SUBCLASS_HEADSET_ADAPTER,
2996                 .name = "HEADSET ADAPTER",
2997                 .c_chmask = 1,
2998                 .p_chmask = 3,
2999                 .st_chmask = 1,
3000         },
3001         {
3002                 /* BAIF + BAOF; IN: Mono only; OUT: Mono only */
3003                 .subclass = UAC3_FUNCTION_SUBCLASS_SPEAKERPHONE,
3004                 .name = "SPEAKERPHONE",
3005                 .c_chmask = 1,
3006                 .p_chmask = 1,
3007         },
3008         { 0 } /* terminator */
3009 };
3010
3011 static bool uac3_badd_func_has_valid_channels(struct usb_mixer_interface *mixer,
3012                                               const struct uac3_badd_profile *f,
3013                                               int c_chmask, int p_chmask)
3014 {
3015         /*
3016          * If both playback/capture channels are dynamic, make sure
3017          * at least one channel is present
3018          */
3019         if (f->c_chmask < 0 && f->p_chmask < 0) {
3020                 if (!c_chmask && !p_chmask) {
3021                         usb_audio_warn(mixer->chip, "BAAD %s: no channels?",
3022                                        f->name);
3023                         return false;
3024                 }
3025                 return true;
3026         }
3027
3028         if ((f->c_chmask < 0 && !c_chmask) ||
3029             (f->c_chmask >= 0 && f->c_chmask != c_chmask)) {
3030                 usb_audio_warn(mixer->chip, "BAAD %s c_chmask mismatch",
3031                                f->name);
3032                 return false;
3033         }
3034         if ((f->p_chmask < 0 && !p_chmask) ||
3035             (f->p_chmask >= 0 && f->p_chmask != p_chmask)) {
3036                 usb_audio_warn(mixer->chip, "BAAD %s p_chmask mismatch",
3037                                f->name);
3038                 return false;
3039         }
3040         return true;
3041 }
3042
3043 /*
3044  * create mixer controls for UAC3 BADD profiles
3045  *
3046  * UAC3 BADD device doesn't contain CS descriptors thus we will guess everything
3047  *
3048  * BADD device may contain Mixer Unit, which doesn't have any controls, skip it
3049  */
3050 static int snd_usb_mixer_controls_badd(struct usb_mixer_interface *mixer,
3051                                        int ctrlif)
3052 {
3053         struct usb_device *dev = mixer->chip->dev;
3054         struct usb_interface_assoc_descriptor *assoc;
3055         int badd_profile = mixer->chip->badd_profile;
3056         const struct uac3_badd_profile *f;
3057         const struct usbmix_ctl_map *map;
3058         int p_chmask = 0, c_chmask = 0, st_chmask = 0;
3059         int i;
3060
3061         assoc = usb_ifnum_to_if(dev, ctrlif)->intf_assoc;
3062
3063         /* Detect BADD capture/playback channels from AS EP descriptors */
3064         for (i = 0; i < assoc->bInterfaceCount; i++) {
3065                 int intf = assoc->bFirstInterface + i;
3066
3067                 struct usb_interface *iface;
3068                 struct usb_host_interface *alts;
3069                 struct usb_interface_descriptor *altsd;
3070                 unsigned int maxpacksize;
3071                 char dir_in;
3072                 int chmask, num;
3073
3074                 if (intf == ctrlif)
3075                         continue;
3076
3077                 iface = usb_ifnum_to_if(dev, intf);
3078                 if (!iface)
3079                         continue;
3080
3081                 num = iface->num_altsetting;
3082
3083                 if (num < 2)
3084                         return -EINVAL;
3085
3086                 /*
3087                  * The number of Channels in an AudioStreaming interface
3088                  * and the audio sample bit resolution (16 bits or 24
3089                  * bits) can be derived from the wMaxPacketSize field in
3090                  * the Standard AS Audio Data Endpoint descriptor in
3091                  * Alternate Setting 1
3092                  */
3093                 alts = &iface->altsetting[1];
3094                 altsd = get_iface_desc(alts);
3095
3096                 if (altsd->bNumEndpoints < 1)
3097                         return -EINVAL;
3098
3099                 /* check direction */
3100                 dir_in = (get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN);
3101                 maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
3102
3103                 switch (maxpacksize) {
3104                 default:
3105                         usb_audio_err(mixer->chip,
3106                                 "incorrect wMaxPacketSize 0x%x for BADD profile\n",
3107                                 maxpacksize);
3108                         return -EINVAL;
3109                 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_16:
3110                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_16:
3111                 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_24:
3112                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_24:
3113                         chmask = 1;
3114                         break;
3115                 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_16:
3116                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_16:
3117                 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_24:
3118                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_24:
3119                         chmask = 3;
3120                         break;
3121                 }
3122
3123                 if (dir_in)
3124                         c_chmask = chmask;
3125                 else
3126                         p_chmask = chmask;
3127         }
3128
3129         usb_audio_dbg(mixer->chip,
3130                 "UAC3 BADD profile 0x%x: detected c_chmask=%d p_chmask=%d\n",
3131                 badd_profile, c_chmask, p_chmask);
3132
3133         /* check the mapping table */
3134         for (map = uac3_badd_usbmix_ctl_maps; map->id; map++) {
3135                 if (map->id == badd_profile)
3136                         break;
3137         }
3138
3139         if (!map->id)
3140                 return -EINVAL;
3141
3142         for (f = uac3_badd_profiles; f->name; f++) {
3143                 if (badd_profile == f->subclass)
3144                         break;
3145         }
3146         if (!f->name)
3147                 return -EINVAL;
3148         if (!uac3_badd_func_has_valid_channels(mixer, f, c_chmask, p_chmask))
3149                 return -EINVAL;
3150         st_chmask = f->st_chmask;
3151
3152         /* Playback */
3153         if (p_chmask) {
3154                 /* Master channel, always writable */
3155                 build_feature_ctl_badd(mixer, 0, UAC_FU_MUTE,
3156                                        UAC3_BADD_FU_ID2, map->map);
3157                 /* Mono/Stereo volume channels, always writable */
3158                 build_feature_ctl_badd(mixer, p_chmask, UAC_FU_VOLUME,
3159                                        UAC3_BADD_FU_ID2, map->map);
3160         }
3161
3162         /* Capture */
3163         if (c_chmask) {
3164                 /* Master channel, always writable */
3165                 build_feature_ctl_badd(mixer, 0, UAC_FU_MUTE,
3166                                        UAC3_BADD_FU_ID5, map->map);
3167                 /* Mono/Stereo volume channels, always writable */
3168                 build_feature_ctl_badd(mixer, c_chmask, UAC_FU_VOLUME,
3169                                        UAC3_BADD_FU_ID5, map->map);
3170         }
3171
3172         /* Side tone-mixing */
3173         if (st_chmask) {
3174                 /* Master channel, always writable */
3175                 build_feature_ctl_badd(mixer, 0, UAC_FU_MUTE,
3176                                        UAC3_BADD_FU_ID7, map->map);
3177                 /* Mono volume channel, always writable */
3178                 build_feature_ctl_badd(mixer, 1, UAC_FU_VOLUME,
3179                                        UAC3_BADD_FU_ID7, map->map);
3180         }
3181
3182         /* Insertion Control */
3183         if (f->subclass == UAC3_FUNCTION_SUBCLASS_HEADSET_ADAPTER) {
3184                 struct usb_audio_term iterm, oterm;
3185
3186                 /* Input Term - Insertion control */
3187                 memset(&iterm, 0, sizeof(iterm));
3188                 iterm.id = UAC3_BADD_IT_ID4;
3189                 iterm.type = UAC_BIDIR_TERMINAL_HEADSET;
3190                 build_connector_control(mixer, map->map, &iterm, true);
3191
3192                 /* Output Term - Insertion control */
3193                 memset(&oterm, 0, sizeof(oterm));
3194                 oterm.id = UAC3_BADD_OT_ID3;
3195                 oterm.type = UAC_BIDIR_TERMINAL_HEADSET;
3196                 build_connector_control(mixer, map->map, &oterm, false);
3197         }
3198
3199         return 0;
3200 }
3201
3202 /*
3203  * create mixer controls
3204  *
3205  * walk through all UAC_OUTPUT_TERMINAL descriptors to search for mixers
3206  */
3207 static int snd_usb_mixer_controls(struct usb_mixer_interface *mixer)
3208 {
3209         struct mixer_build state;
3210         int err;
3211         const struct usbmix_ctl_map *map;
3212         void *p;
3213
3214         memset(&state, 0, sizeof(state));
3215         state.chip = mixer->chip;
3216         state.mixer = mixer;
3217         state.buffer = mixer->hostif->extra;
3218         state.buflen = mixer->hostif->extralen;
3219
3220         /* check the mapping table */
3221         for (map = usbmix_ctl_maps; map->id; map++) {
3222                 if (map->id == state.chip->usb_id) {
3223                         state.map = map->map;
3224                         state.selector_map = map->selector_map;
3225                         mixer->connector_map = map->connector_map;
3226                         break;
3227                 }
3228         }
3229
3230         p = NULL;
3231         while ((p = snd_usb_find_csint_desc(mixer->hostif->extra,
3232                                             mixer->hostif->extralen,
3233                                             p, UAC_OUTPUT_TERMINAL)) != NULL) {
3234                 if (!snd_usb_validate_audio_desc(p, mixer->protocol))
3235                         continue; /* skip invalid descriptor */
3236
3237                 if (mixer->protocol == UAC_VERSION_1) {
3238                         struct uac1_output_terminal_descriptor *desc = p;
3239
3240                         /* mark terminal ID as visited */
3241                         set_bit(desc->bTerminalID, state.unitbitmap);
3242                         state.oterm.id = desc->bTerminalID;
3243                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
3244                         state.oterm.name = desc->iTerminal;
3245                         err = parse_audio_unit(&state, desc->bSourceID);
3246                         if (err < 0 && err != -EINVAL)
3247                                 return err;
3248                 } else if (mixer->protocol == UAC_VERSION_2) {
3249                         struct uac2_output_terminal_descriptor *desc = p;
3250
3251                         /* mark terminal ID as visited */
3252                         set_bit(desc->bTerminalID, state.unitbitmap);
3253                         state.oterm.id = desc->bTerminalID;
3254                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
3255                         state.oterm.name = desc->iTerminal;
3256                         err = parse_audio_unit(&state, desc->bSourceID);
3257                         if (err < 0 && err != -EINVAL)
3258                                 return err;
3259
3260                         /*
3261                          * For UAC2, use the same approach to also add the
3262                          * clock selectors
3263                          */
3264                         err = parse_audio_unit(&state, desc->bCSourceID);
3265                         if (err < 0 && err != -EINVAL)
3266                                 return err;
3267
3268                         if ((state.oterm.type & 0xff00) != 0x0100 &&
3269                             uac_v2v3_control_is_readable(le16_to_cpu(desc->bmControls),
3270                                                          UAC2_TE_CONNECTOR)) {
3271                                 build_connector_control(state.mixer, state.map,
3272                                                         &state.oterm, false);
3273                         }
3274                 } else {  /* UAC_VERSION_3 */
3275                         struct uac3_output_terminal_descriptor *desc = p;
3276
3277                         /* mark terminal ID as visited */
3278                         set_bit(desc->bTerminalID, state.unitbitmap);
3279                         state.oterm.id = desc->bTerminalID;
3280                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
3281                         state.oterm.name = le16_to_cpu(desc->wTerminalDescrStr);
3282                         err = parse_audio_unit(&state, desc->bSourceID);
3283                         if (err < 0 && err != -EINVAL)
3284                                 return err;
3285
3286                         /*
3287                          * For UAC3, use the same approach to also add the
3288                          * clock selectors
3289                          */
3290                         err = parse_audio_unit(&state, desc->bCSourceID);
3291                         if (err < 0 && err != -EINVAL)
3292                                 return err;
3293
3294                         if ((state.oterm.type & 0xff00) != 0x0100 &&
3295                             uac_v2v3_control_is_readable(le32_to_cpu(desc->bmControls),
3296                                                          UAC3_TE_INSERTION)) {
3297                                 build_connector_control(state.mixer, state.map,
3298                                                         &state.oterm, false);
3299                         }
3300                 }
3301         }
3302
3303         return 0;
3304 }
3305
3306 static int delegate_notify(struct usb_mixer_interface *mixer, int unitid,
3307                            u8 *control, u8 *channel)
3308 {
3309         const struct usbmix_connector_map *map = mixer->connector_map;
3310
3311         if (!map)
3312                 return unitid;
3313
3314         for (; map->id; map++) {
3315                 if (map->id == unitid) {
3316                         if (control && map->control)
3317                                 *control = map->control;
3318                         if (channel && map->channel)
3319                                 *channel = map->channel;
3320                         return map->delegated_id;
3321                 }
3322         }
3323         return unitid;
3324 }
3325
3326 void snd_usb_mixer_notify_id(struct usb_mixer_interface *mixer, int unitid)
3327 {
3328         struct usb_mixer_elem_list *list;
3329
3330         unitid = delegate_notify(mixer, unitid, NULL, NULL);
3331
3332         for_each_mixer_elem(list, mixer, unitid) {
3333                 struct usb_mixer_elem_info *info;
3334
3335                 if (!list->is_std_info)
3336                         continue;
3337                 info = mixer_elem_list_to_info(list);
3338                 /* invalidate cache, so the value is read from the device */
3339                 info->cached = 0;
3340                 snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
3341                                &list->kctl->id);
3342         }
3343 }
3344
3345 static void snd_usb_mixer_dump_cval(struct snd_info_buffer *buffer,
3346                                     struct usb_mixer_elem_list *list)
3347 {
3348         struct usb_mixer_elem_info *cval = mixer_elem_list_to_info(list);
3349         static const char * const val_types[] = {
3350                 [USB_MIXER_BOOLEAN] = "BOOLEAN",
3351                 [USB_MIXER_INV_BOOLEAN] = "INV_BOOLEAN",
3352                 [USB_MIXER_S8] = "S8",
3353                 [USB_MIXER_U8] = "U8",
3354                 [USB_MIXER_S16] = "S16",
3355                 [USB_MIXER_U16] = "U16",
3356                 [USB_MIXER_S32] = "S32",
3357                 [USB_MIXER_U32] = "U32",
3358                 [USB_MIXER_BESPOKEN] = "BESPOKEN",
3359         };
3360         snd_iprintf(buffer, "    Info: id=%i, control=%i, cmask=0x%x, "
3361                             "channels=%i, type=\"%s\"\n", cval->head.id,
3362                             cval->control, cval->cmask, cval->channels,
3363                             val_types[cval->val_type]);
3364         snd_iprintf(buffer, "    Volume: min=%i, max=%i, dBmin=%i, dBmax=%i\n",
3365                             cval->min, cval->max, cval->dBmin, cval->dBmax);
3366 }
3367
3368 static void snd_usb_mixer_proc_read(struct snd_info_entry *entry,
3369                                     struct snd_info_buffer *buffer)
3370 {
3371         struct snd_usb_audio *chip = entry->private_data;
3372         struct usb_mixer_interface *mixer;
3373         struct usb_mixer_elem_list *list;
3374         int unitid;
3375
3376         list_for_each_entry(mixer, &chip->mixer_list, list) {
3377                 snd_iprintf(buffer,
3378                         "USB Mixer: usb_id=0x%08x, ctrlif=%i, ctlerr=%i\n",
3379                                 chip->usb_id, mixer_ctrl_intf(mixer),
3380                                 mixer->ignore_ctl_error);
3381                 snd_iprintf(buffer, "Card: %s\n", chip->card->longname);
3382                 for (unitid = 0; unitid < MAX_ID_ELEMS; unitid++) {
3383                         for_each_mixer_elem(list, mixer, unitid) {
3384                                 snd_iprintf(buffer, "  Unit: %i\n", list->id);
3385                                 if (list->kctl)
3386                                         snd_iprintf(buffer,
3387                                                     "    Control: name=\"%s\", index=%i\n",
3388                                                     list->kctl->id.name,
3389                                                     list->kctl->id.index);
3390                                 if (list->dump)
3391                                         list->dump(buffer, list);
3392                         }
3393                 }
3394         }
3395 }
3396
3397 static void snd_usb_mixer_interrupt_v2(struct usb_mixer_interface *mixer,
3398                                        int attribute, int value, int index)
3399 {
3400         struct usb_mixer_elem_list *list;
3401         __u8 unitid = (index >> 8) & 0xff;
3402         __u8 control = (value >> 8) & 0xff;
3403         __u8 channel = value & 0xff;
3404         unsigned int count = 0;
3405
3406         if (channel >= MAX_CHANNELS) {
3407                 usb_audio_dbg(mixer->chip,
3408                         "%s(): bogus channel number %d\n",
3409                         __func__, channel);
3410                 return;
3411         }
3412
3413         unitid = delegate_notify(mixer, unitid, &control, &channel);
3414
3415         for_each_mixer_elem(list, mixer, unitid)
3416                 count++;
3417
3418         if (count == 0)
3419                 return;
3420
3421         for_each_mixer_elem(list, mixer, unitid) {
3422                 struct usb_mixer_elem_info *info;
3423
3424                 if (!list->kctl)
3425                         continue;
3426                 if (!list->is_std_info)
3427                         continue;
3428
3429                 info = mixer_elem_list_to_info(list);
3430                 if (count > 1 && info->control != control)
3431                         continue;
3432
3433                 switch (attribute) {
3434                 case UAC2_CS_CUR:
3435                         /* invalidate cache, so the value is read from the device */
3436                         if (channel)
3437                                 info->cached &= ~(1 << channel);
3438                         else /* master channel */
3439                                 info->cached = 0;
3440
3441                         snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
3442                                        &info->head.kctl->id);
3443                         break;
3444
3445                 case UAC2_CS_RANGE:
3446                         /* TODO */
3447                         break;
3448
3449                 case UAC2_CS_MEM:
3450                         /* TODO */
3451                         break;
3452
3453                 default:
3454                         usb_audio_dbg(mixer->chip,
3455                                 "unknown attribute %d in interrupt\n",
3456                                 attribute);
3457                         break;
3458                 } /* switch */
3459         }
3460 }
3461
3462 static void snd_usb_mixer_interrupt(struct urb *urb)
3463 {
3464         struct usb_mixer_interface *mixer = urb->context;
3465         int len = urb->actual_length;
3466         int ustatus = urb->status;
3467
3468         if (ustatus != 0)
3469                 goto requeue;
3470
3471         if (mixer->protocol == UAC_VERSION_1) {
3472                 struct uac1_status_word *status;
3473
3474                 for (status = urb->transfer_buffer;
3475                      len >= sizeof(*status);
3476                      len -= sizeof(*status), status++) {
3477                         dev_dbg(&urb->dev->dev, "status interrupt: %02x %02x\n",
3478                                                 status->bStatusType,
3479                                                 status->bOriginator);
3480
3481                         /* ignore any notifications not from the control interface */
3482                         if ((status->bStatusType & UAC1_STATUS_TYPE_ORIG_MASK) !=
3483                                 UAC1_STATUS_TYPE_ORIG_AUDIO_CONTROL_IF)
3484                                 continue;
3485
3486                         if (status->bStatusType & UAC1_STATUS_TYPE_MEM_CHANGED)
3487                                 snd_usb_mixer_rc_memory_change(mixer, status->bOriginator);
3488                         else
3489                                 snd_usb_mixer_notify_id(mixer, status->bOriginator);
3490                 }
3491         } else { /* UAC_VERSION_2 */
3492                 struct uac2_interrupt_data_msg *msg;
3493
3494                 for (msg = urb->transfer_buffer;
3495                      len >= sizeof(*msg);
3496                      len -= sizeof(*msg), msg++) {
3497                         /* drop vendor specific and endpoint requests */
3498                         if ((msg->bInfo & UAC2_INTERRUPT_DATA_MSG_VENDOR) ||
3499                             (msg->bInfo & UAC2_INTERRUPT_DATA_MSG_EP))
3500                                 continue;
3501
3502                         snd_usb_mixer_interrupt_v2(mixer, msg->bAttribute,
3503                                                    le16_to_cpu(msg->wValue),
3504                                                    le16_to_cpu(msg->wIndex));
3505                 }
3506         }
3507
3508 requeue:
3509         if (ustatus != -ENOENT &&
3510             ustatus != -ECONNRESET &&
3511             ustatus != -ESHUTDOWN) {
3512                 urb->dev = mixer->chip->dev;
3513                 usb_submit_urb(urb, GFP_ATOMIC);
3514         }
3515 }
3516
3517 /* create the handler for the optional status interrupt endpoint */
3518 static int snd_usb_mixer_status_create(struct usb_mixer_interface *mixer)
3519 {
3520         struct usb_endpoint_descriptor *ep;
3521         void *transfer_buffer;
3522         int buffer_length;
3523         unsigned int epnum;
3524
3525         /* we need one interrupt input endpoint */
3526         if (get_iface_desc(mixer->hostif)->bNumEndpoints < 1)
3527                 return 0;
3528         ep = get_endpoint(mixer->hostif, 0);
3529         if (!usb_endpoint_dir_in(ep) || !usb_endpoint_xfer_int(ep))
3530                 return 0;
3531
3532         epnum = usb_endpoint_num(ep);
3533         buffer_length = le16_to_cpu(ep->wMaxPacketSize);
3534         transfer_buffer = kmalloc(buffer_length, GFP_KERNEL);
3535         if (!transfer_buffer)
3536                 return -ENOMEM;
3537         mixer->urb = usb_alloc_urb(0, GFP_KERNEL);
3538         if (!mixer->urb) {
3539                 kfree(transfer_buffer);
3540                 return -ENOMEM;
3541         }
3542         usb_fill_int_urb(mixer->urb, mixer->chip->dev,
3543                          usb_rcvintpipe(mixer->chip->dev, epnum),
3544                          transfer_buffer, buffer_length,
3545                          snd_usb_mixer_interrupt, mixer, ep->bInterval);
3546         usb_submit_urb(mixer->urb, GFP_KERNEL);
3547         return 0;
3548 }
3549
3550 int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif)
3551 {
3552         static const struct snd_device_ops dev_ops = {
3553                 .dev_free = snd_usb_mixer_dev_free
3554         };
3555         struct usb_mixer_interface *mixer;
3556         int err;
3557
3558         strcpy(chip->card->mixername, "USB Mixer");
3559
3560         mixer = kzalloc(sizeof(*mixer), GFP_KERNEL);
3561         if (!mixer)
3562                 return -ENOMEM;
3563         mixer->chip = chip;
3564         mixer->ignore_ctl_error = !!(chip->quirk_flags & QUIRK_FLAG_IGNORE_CTL_ERROR);
3565         mixer->id_elems = kcalloc(MAX_ID_ELEMS, sizeof(*mixer->id_elems),
3566                                   GFP_KERNEL);
3567         if (!mixer->id_elems) {
3568                 kfree(mixer);
3569                 return -ENOMEM;
3570         }
3571
3572         mixer->hostif = &usb_ifnum_to_if(chip->dev, ctrlif)->altsetting[0];
3573         switch (get_iface_desc(mixer->hostif)->bInterfaceProtocol) {
3574         case UAC_VERSION_1:
3575         default:
3576                 mixer->protocol = UAC_VERSION_1;
3577                 break;
3578         case UAC_VERSION_2:
3579                 mixer->protocol = UAC_VERSION_2;
3580                 break;
3581         case UAC_VERSION_3:
3582                 mixer->protocol = UAC_VERSION_3;
3583                 break;
3584         }
3585
3586         if (mixer->protocol == UAC_VERSION_3 &&
3587                         chip->badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) {
3588                 err = snd_usb_mixer_controls_badd(mixer, ctrlif);
3589                 if (err < 0)
3590                         goto _error;
3591         } else {
3592                 err = snd_usb_mixer_controls(mixer);
3593                 if (err < 0)
3594                         goto _error;
3595         }
3596
3597         err = snd_usb_mixer_status_create(mixer);
3598         if (err < 0)
3599                 goto _error;
3600
3601         err = snd_usb_mixer_apply_create_quirk(mixer);
3602         if (err < 0)
3603                 goto _error;
3604
3605         err = snd_device_new(chip->card, SNDRV_DEV_CODEC, mixer, &dev_ops);
3606         if (err < 0)
3607                 goto _error;
3608
3609         if (list_empty(&chip->mixer_list))
3610                 snd_card_ro_proc_new(chip->card, "usbmixer", chip,
3611                                      snd_usb_mixer_proc_read);
3612
3613         list_add(&mixer->list, &chip->mixer_list);
3614         return 0;
3615
3616 _error:
3617         snd_usb_mixer_free(mixer);
3618         return err;
3619 }
3620
3621 void snd_usb_mixer_disconnect(struct usb_mixer_interface *mixer)
3622 {
3623         if (mixer->disconnected)
3624                 return;
3625         if (mixer->urb)
3626                 usb_kill_urb(mixer->urb);
3627         if (mixer->rc_urb)
3628                 usb_kill_urb(mixer->rc_urb);
3629         if (mixer->private_free)
3630                 mixer->private_free(mixer);
3631         mixer->disconnected = true;
3632 }
3633
3634 /* stop any bus activity of a mixer */
3635 static void snd_usb_mixer_inactivate(struct usb_mixer_interface *mixer)
3636 {
3637         usb_kill_urb(mixer->urb);
3638         usb_kill_urb(mixer->rc_urb);
3639 }
3640
3641 static int snd_usb_mixer_activate(struct usb_mixer_interface *mixer)
3642 {
3643         int err;
3644
3645         if (mixer->urb) {
3646                 err = usb_submit_urb(mixer->urb, GFP_NOIO);
3647                 if (err < 0)
3648                         return err;
3649         }
3650
3651         return 0;
3652 }
3653
3654 int snd_usb_mixer_suspend(struct usb_mixer_interface *mixer)
3655 {
3656         snd_usb_mixer_inactivate(mixer);
3657         if (mixer->private_suspend)
3658                 mixer->private_suspend(mixer);
3659         return 0;
3660 }
3661
3662 static int restore_mixer_value(struct usb_mixer_elem_list *list)
3663 {
3664         struct usb_mixer_elem_info *cval = mixer_elem_list_to_info(list);
3665         int c, err, idx;
3666
3667         if (cval->val_type == USB_MIXER_BESPOKEN)
3668                 return 0;
3669
3670         if (cval->cmask) {
3671                 idx = 0;
3672                 for (c = 0; c < MAX_CHANNELS; c++) {
3673                         if (!(cval->cmask & (1 << c)))
3674                                 continue;
3675                         if (cval->cached & (1 << (c + 1))) {
3676                                 err = snd_usb_set_cur_mix_value(cval, c + 1, idx,
3677                                                         cval->cache_val[idx]);
3678                                 if (err < 0)
3679                                         break;
3680                         }
3681                         idx++;
3682                 }
3683         } else {
3684                 /* master */
3685                 if (cval->cached)
3686                         snd_usb_set_cur_mix_value(cval, 0, 0, *cval->cache_val);
3687         }
3688
3689         return 0;
3690 }
3691
3692 int snd_usb_mixer_resume(struct usb_mixer_interface *mixer)
3693 {
3694         struct usb_mixer_elem_list *list;
3695         int id, err;
3696
3697         /* restore cached mixer values */
3698         for (id = 0; id < MAX_ID_ELEMS; id++) {
3699                 for_each_mixer_elem(list, mixer, id) {
3700                         if (list->resume) {
3701                                 err = list->resume(list);
3702                                 if (err < 0)
3703                                         return err;
3704                         }
3705                 }
3706         }
3707
3708         snd_usb_mixer_resume_quirk(mixer);
3709
3710         return snd_usb_mixer_activate(mixer);
3711 }
3712
3713 void snd_usb_mixer_elem_init_std(struct usb_mixer_elem_list *list,
3714                                  struct usb_mixer_interface *mixer,
3715                                  int unitid)
3716 {
3717         list->mixer = mixer;
3718         list->id = unitid;
3719         list->dump = snd_usb_mixer_dump_cval;
3720         list->resume = restore_mixer_value;
3721 }