sound/usb/mixer.c

   1 /*
   2  *   (Tentative) USB Audio Driver for ALSA
   3  *
   4  *   Mixer control part
   5  *
   6  *   Copyright (c) 2002 by Takashi Iwai <[email protected]>
   7  *
   8  *   Many codes borrowed from audio.c by
   9  *          Alan Cox ([email protected])
  10  *          Thomas Sailer ([email protected])
  11  *
  12  *
  13  *   This program is free software; you can redistribute it and/or modify
  14  *   it under the terms of the GNU General Public License as published by
  15  *   the Free Software Foundation; either version 2 of the License, or
  16  *   (at your option) any later version.
  17  *
  18  *   This program is distributed in the hope that it will be useful,
  19  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  *   GNU General Public License for more details.
  22  *
  23  *   You should have received a copy of the GNU General Public License
  24  *   along with this program; if not, write to the Free Software
  25  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  26  *
  27  */
  28
  29 /*
  30  * TODOs, for both the mixer and the streaming interfaces:
  31  *
  32  *  - support for UAC2 effect units
  33  *  - support for graphical equalizers
  34  *  - RANGE and MEM set commands (UAC2)
  35  *  - RANGE and MEM interrupt dispatchers (UAC2)
  36  *  - audio channel clustering (UAC2)
  37  *  - audio sample rate converter units (UAC2)
  38  *  - proper handling of clock multipliers (UAC2)
  39  *  - dispatch clock change notifications (UAC2)
  40  *      - stop PCM streams which use a clock that became invalid
  41  *      - stop PCM streams which use a clock selector that has changed
  42  *      - parse available sample rates again when clock sources changed
  43  */
  44
  45 #include <linux/bitops.h>
  46 #include <linux/init.h>
  47 #include <linux/list.h>
  48 #include <linux/log2.h>
  49 #include <linux/slab.h>
  50 #include <linux/string.h>
  51 #include <linux/usb.h>
  52 #include <linux/usb/audio.h>
  53 #include <linux/usb/audio-v2.h>
  54 #include <linux/usb/audio-v3.h>
  55
  56 #include <sound/core.h>
  57 #include <sound/control.h>
  58 #include <sound/hwdep.h>
  59 #include <sound/info.h>
  60 #include <sound/tlv.h>
  61
  62 #include "usbaudio.h"
  63 #include "mixer.h"
  64 #include "helper.h"
  65 #include "mixer_quirks.h"
  66 #include "power.h"
  67
  68 #define MAX_ID_ELEMS    256
  69
  70 struct usb_audio_term {
  71         int id;
  72         int type;
  73         int channels;
  74         unsigned int chconfig;
  75         int name;
  76 };
  77
  78 struct usbmix_name_map;
  79
  80 struct mixer_build {
  81         struct snd_usb_audio *chip;
  82         struct usb_mixer_interface *mixer;
  83         unsigned char *buffer;
  84         unsigned int buflen;
  85         DECLARE_BITMAP(unitbitmap, MAX_ID_ELEMS);
  86         struct usb_audio_term oterm;
  87         const struct usbmix_name_map *map;
  88         const struct usbmix_selector_map *selector_map;
  89 };
  90
  91 /*E-mu 0202/0404/0204 eXtension Unit(XU) control*/
  92 enum {
  93         USB_XU_CLOCK_RATE               = 0xe301,
  94         USB_XU_CLOCK_SOURCE             = 0xe302,
  95         USB_XU_DIGITAL_IO_STATUS        = 0xe303,
  96         USB_XU_DEVICE_OPTIONS           = 0xe304,
  97         USB_XU_DIRECT_MONITORING        = 0xe305,
  98         USB_XU_METERING                 = 0xe306
  99 };
 100 enum {
 101         USB_XU_CLOCK_SOURCE_SELECTOR = 0x02,    /* clock source*/
 102         USB_XU_CLOCK_RATE_SELECTOR = 0x03,      /* clock rate */
 103         USB_XU_DIGITAL_FORMAT_SELECTOR = 0x01,  /* the spdif format */
 104         USB_XU_SOFT_LIMIT_SELECTOR = 0x03       /* soft limiter */
 105 };
 106
 107 /*
 108  * manual mapping of mixer names
 109  * if the mixer topology is too complicated and the parsed names are
 110  * ambiguous, add the entries in usbmixer_maps.c.
 111  */
 112 #include "mixer_maps.c"
 113
 114 static const struct usbmix_name_map *
 115 find_map(struct mixer_build *state, int unitid, int control)
 116 {
 117         const struct usbmix_name_map *p = state->map;
 118
 119         if (!p)
 120                 return NULL;
 121
 122         for (p = state->map; p->id; p++) {
 123                 if (p->id == unitid &&
 124                     (!control || !p->control || control == p->control))
 125                         return p;
 126         }
 127         return NULL;
 128 }
 129
 130 /* get the mapped name if the unit matches */
 131 static int
 132 check_mapped_name(const struct usbmix_name_map *p, char *buf, int buflen)
 133 {
 134         if (!p || !p->name)
 135                 return 0;
 136
 137         buflen--;
 138         return strlcpy(buf, p->name, buflen);
 139 }
 140
 141 /* ignore the error value if ignore_ctl_error flag is set */
 142 #define filter_error(cval, err) \
 143         ((cval)->head.mixer->ignore_ctl_error ? 0 : (err))
 144
 145 /* check whether the control should be ignored */
 146 static inline int
 147 check_ignored_ctl(const struct usbmix_name_map *p)
 148 {
 149         if (!p || p->name || p->dB)
 150                 return 0;
 151         return 1;
 152 }
 153
 154 /* dB mapping */
 155 static inline void check_mapped_dB(const struct usbmix_name_map *p,
 156                                    struct usb_mixer_elem_info *cval)
 157 {
 158         if (p && p->dB) {
 159                 cval->dBmin = p->dB->min;
 160                 cval->dBmax = p->dB->max;
 161                 cval->initialized = 1;
 162         }
 163 }
 164
 165 /* get the mapped selector source name */
 166 static int check_mapped_selector_name(struct mixer_build *state, int unitid,
 167                                       int index, char *buf, int buflen)
 168 {
 169         const struct usbmix_selector_map *p;
 170
 171         if (!state->selector_map)
 172                 return 0;
 173         for (p = state->selector_map; p->id; p++) {
 174                 if (p->id == unitid && index < p->count)
 175                         return strlcpy(buf, p->names[index], buflen);
 176         }
 177         return 0;
 178 }
 179
 180 /*
 181  * find an audio control unit with the given unit id
 182  */
 183 static void *find_audio_control_unit(struct mixer_build *state,
 184                                      unsigned char unit)
 185 {
 186         /* we just parse the header */
 187         struct uac_feature_unit_descriptor *hdr = NULL;
 188
 189         while ((hdr = snd_usb_find_desc(state->buffer, state->buflen, hdr,
 190                                         USB_DT_CS_INTERFACE)) != NULL) {
 191                 if (hdr->bLength >= 4 &&
 192                     hdr->bDescriptorSubtype >= UAC_INPUT_TERMINAL &&
 193                     hdr->bDescriptorSubtype <= UAC3_SAMPLE_RATE_CONVERTER &&
 194                     hdr->bUnitID == unit)
 195                         return hdr;
 196         }
 197
 198         return NULL;
 199 }
 200
 201 /*
 202  * copy a string with the given id
 203  */
 204 static int snd_usb_copy_string_desc(struct mixer_build *state,
 205                                     int index, char *buf, int maxlen)
 206 {
 207         int len = usb_string(state->chip->dev, index, buf, maxlen - 1);
 208
 209         if (len < 0)
 210                 return 0;
 211
 212         buf[len] = 0;
 213         return len;
 214 }
 215
 216 /*
 217  * convert from the byte/word on usb descriptor to the zero-based integer
 218  */
 219 static int convert_signed_value(struct usb_mixer_elem_info *cval, int val)
 220 {
 221         switch (cval->val_type) {
 222         case USB_MIXER_BOOLEAN:
 223                 return !!val;
 224         case USB_MIXER_INV_BOOLEAN:
 225                 return !val;
 226         case USB_MIXER_U8:
 227                 val &= 0xff;
 228                 break;
 229         case USB_MIXER_S8:
 230                 val &= 0xff;
 231                 if (val >= 0x80)
 232                         val -= 0x100;
 233                 break;
 234         case USB_MIXER_U16:
 235                 val &= 0xffff;
 236                 break;
 237         case USB_MIXER_S16:
 238                 val &= 0xffff;
 239                 if (val >= 0x8000)
 240                         val -= 0x10000;
 241                 break;
 242         }
 243         return val;
 244 }
 245
 246 /*
 247  * convert from the zero-based int to the byte/word for usb descriptor
 248  */
 249 static int convert_bytes_value(struct usb_mixer_elem_info *cval, int val)
 250 {
 251         switch (cval->val_type) {
 252         case USB_MIXER_BOOLEAN:
 253                 return !!val;
 254         case USB_MIXER_INV_BOOLEAN:
 255                 return !val;
 256         case USB_MIXER_S8:
 257         case USB_MIXER_U8:
 258                 return val & 0xff;
 259         case USB_MIXER_S16:
 260         case USB_MIXER_U16:
 261                 return val & 0xffff;
 262         }
 263         return 0; /* not reached */
 264 }
 265
 266 static int get_relative_value(struct usb_mixer_elem_info *cval, int val)
 267 {
 268         if (!cval->res)
 269                 cval->res = 1;
 270         if (val < cval->min)
 271                 return 0;
 272         else if (val >= cval->max)
 273                 return (cval->max - cval->min + cval->res - 1) / cval->res;
 274         else
 275                 return (val - cval->min) / cval->res;
 276 }
 277
 278 static int get_abs_value(struct usb_mixer_elem_info *cval, int val)
 279 {
 280         if (val < 0)
 281                 return cval->min;
 282         if (!cval->res)
 283                 cval->res = 1;
 284         val *= cval->res;
 285         val += cval->min;
 286         if (val > cval->max)
 287                 return cval->max;
 288         return val;
 289 }
 290
 291 static int uac2_ctl_value_size(int val_type)
 292 {
 293         switch (val_type) {
 294         case USB_MIXER_S32:
 295         case USB_MIXER_U32:
 296                 return 4;
 297         case USB_MIXER_S16:
 298         case USB_MIXER_U16:
 299                 return 2;
 300         default:
 301                 return 1;
 302         }
 303         return 0; /* unreachable */
 304 }
 305
 306
 307 /*
 308  * retrieve a mixer value
 309  */
 310
 311 static int get_ctl_value_v1(struct usb_mixer_elem_info *cval, int request,
 312                             int validx, int *value_ret)
 313 {
 314         struct snd_usb_audio *chip = cval->head.mixer->chip;
 315         unsigned char buf[2];
 316         int val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
 317         int timeout = 10;
 318         int idx = 0, err;
 319
 320         err = snd_usb_lock_shutdown(chip);
 321         if (err < 0)
 322                 return -EIO;
 323
 324         while (timeout-- > 0) {
 325                 idx = snd_usb_ctrl_intf(chip) | (cval->head.id << 8);
 326                 err = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), request,
 327                                       USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
 328                                       validx, idx, buf, val_len);
 329                 if (err >= val_len) {
 330                         *value_ret = convert_signed_value(cval, snd_usb_combine_bytes(buf, val_len));
 331                         err = 0;
 332                         goto out;
 333                 } else if (err == -ETIMEDOUT) {
 334                         goto out;
 335                 }
 336         }
 337         usb_audio_dbg(chip,
 338                 "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
 339                 request, validx, idx, cval->val_type);
 340         err = -EINVAL;
 341
 342  out:
 343         snd_usb_unlock_shutdown(chip);
 344         return err;
 345 }
 346
 347 static int get_ctl_value_v2(struct usb_mixer_elem_info *cval, int request,
 348                             int validx, int *value_ret)
 349 {
 350         struct snd_usb_audio *chip = cval->head.mixer->chip;
 351         /* enough space for one range */
 352         unsigned char buf[sizeof(__u16) + 3 * sizeof(__u32)];
 353         unsigned char *val;
 354         int idx = 0, ret, val_size, size;
 355         __u8 bRequest;
 356
 357         val_size = uac2_ctl_value_size(cval->val_type);
 358
 359         if (request == UAC_GET_CUR) {
 360                 bRequest = UAC2_CS_CUR;
 361                 size = val_size;
 362         } else {
 363                 bRequest = UAC2_CS_RANGE;
 364                 size = sizeof(__u16) + 3 * val_size;
 365         }
 366
 367         memset(buf, 0, sizeof(buf));
 368
 369         ret = snd_usb_lock_shutdown(chip) ? -EIO : 0;
 370         if (ret)
 371                 goto error;
 372
 373         idx = snd_usb_ctrl_intf(chip) | (cval->head.id << 8);
 374         ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), bRequest,
 375                               USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
 376                               validx, idx, buf, size);
 377         snd_usb_unlock_shutdown(chip);
 378
 379         if (ret < 0) {
 380 error:
 381                 usb_audio_err(chip,
 382                         "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
 383                         request, validx, idx, cval->val_type);
 384                 return ret;
 385         }
 386
 387         /* FIXME: how should we handle multiple triplets here? */
 388
 389         switch (request) {
 390         case UAC_GET_CUR:
 391                 val = buf;
 392                 break;
 393         case UAC_GET_MIN:
 394                 val = buf + sizeof(__u16);
 395                 break;
 396         case UAC_GET_MAX:
 397                 val = buf + sizeof(__u16) + val_size;
 398                 break;
 399         case UAC_GET_RES:
 400                 val = buf + sizeof(__u16) + val_size * 2;
 401                 break;
 402         default:
 403                 return -EINVAL;
 404         }
 405
 406         *value_ret = convert_signed_value(cval,
 407                                           snd_usb_combine_bytes(val, val_size));
 408
 409         return 0;
 410 }
 411
 412 static int get_ctl_value(struct usb_mixer_elem_info *cval, int request,
 413                          int validx, int *value_ret)
 414 {
 415         validx += cval->idx_off;
 416
 417         return (cval->head.mixer->protocol == UAC_VERSION_1) ?
 418                 get_ctl_value_v1(cval, request, validx, value_ret) :
 419                 get_ctl_value_v2(cval, request, validx, value_ret);
 420 }
 421
 422 static int get_cur_ctl_value(struct usb_mixer_elem_info *cval,
 423                              int validx, int *value)
 424 {
 425         return get_ctl_value(cval, UAC_GET_CUR, validx, value);
 426 }
 427
 428 /* channel = 0: master, 1 = first channel */
 429 static inline int get_cur_mix_raw(struct usb_mixer_elem_info *cval,
 430                                   int channel, int *value)
 431 {
 432         return get_ctl_value(cval, UAC_GET_CUR,
 433                              (cval->control << 8) | channel,
 434                              value);
 435 }
 436
 437 int snd_usb_get_cur_mix_value(struct usb_mixer_elem_info *cval,
 438                              int channel, int index, int *value)
 439 {
 440         int err;
 441
 442         if (cval->cached & (1 << channel)) {
 443                 *value = cval->cache_val[index];
 444                 return 0;
 445         }
 446         err = get_cur_mix_raw(cval, channel, value);
 447         if (err < 0) {
 448                 if (!cval->head.mixer->ignore_ctl_error)
 449                         usb_audio_dbg(cval->head.mixer->chip,
 450                                 "cannot get current value for control %d ch %d: err = %d\n",
 451                                       cval->control, channel, err);
 452                 return err;
 453         }
 454         cval->cached |= 1 << channel;
 455         cval->cache_val[index] = *value;
 456         return 0;
 457 }
 458
 459 /*
 460  * set a mixer value
 461  */
 462
 463 int snd_usb_mixer_set_ctl_value(struct usb_mixer_elem_info *cval,
 464                                 int request, int validx, int value_set)
 465 {
 466         struct snd_usb_audio *chip = cval->head.mixer->chip;
 467         unsigned char buf[4];
 468         int idx = 0, val_len, err, timeout = 10;
 469
 470         validx += cval->idx_off;
 471
 472
 473         if (cval->head.mixer->protocol == UAC_VERSION_1) {
 474                 val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
 475         } else { /* UAC_VERSION_2/3 */
 476                 val_len = uac2_ctl_value_size(cval->val_type);
 477
 478                 /* FIXME */
 479                 if (request != UAC_SET_CUR) {
 480                         usb_audio_dbg(chip, "RANGE setting not yet supported\n");
 481                         return -EINVAL;
 482                 }
 483
 484                 request = UAC2_CS_CUR;
 485         }
 486
 487         value_set = convert_bytes_value(cval, value_set);
 488         buf[0] = value_set & 0xff;
 489         buf[1] = (value_set >> 8) & 0xff;
 490         buf[2] = (value_set >> 16) & 0xff;
 491         buf[3] = (value_set >> 24) & 0xff;
 492
 493         err = snd_usb_lock_shutdown(chip);
 494         if (err < 0)
 495                 return -EIO;
 496
 497         while (timeout-- > 0) {
 498                 idx = snd_usb_ctrl_intf(chip) | (cval->head.id << 8);
 499                 err = snd_usb_ctl_msg(chip->dev,
 500                                       usb_sndctrlpipe(chip->dev, 0), request,
 501                                       USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
 502                                       validx, idx, buf, val_len);
 503                 if (err >= 0) {
 504                         err = 0;
 505                         goto out;
 506                 } else if (err == -ETIMEDOUT) {
 507                         goto out;
 508                 }
 509         }
 510         usb_audio_dbg(chip, "cannot set ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d, data = %#x/%#x\n",
 511                       request, validx, idx, cval->val_type, buf[0], buf[1]);
 512         err = -EINVAL;
 513
 514  out:
 515         snd_usb_unlock_shutdown(chip);
 516         return err;
 517 }
 518
 519 static int set_cur_ctl_value(struct usb_mixer_elem_info *cval,
 520                              int validx, int value)
 521 {
 522         return snd_usb_mixer_set_ctl_value(cval, UAC_SET_CUR, validx, value);
 523 }
 524
 525 int snd_usb_set_cur_mix_value(struct usb_mixer_elem_info *cval, int channel,
 526                              int index, int value)
 527 {
 528         int err;
 529         unsigned int read_only = (channel == 0) ?
 530                 cval->master_readonly :
 531                 cval->ch_readonly & (1 << (channel - 1));
 532
 533         if (read_only) {
 534                 usb_audio_dbg(cval->head.mixer->chip,
 535                               "%s(): channel %d of control %d is read_only\n",
 536                             __func__, channel, cval->control);
 537                 return 0;
 538         }
 539
 540         err = snd_usb_mixer_set_ctl_value(cval,
 541                                           UAC_SET_CUR, (cval->control << 8) | channel,
 542                                           value);
 543         if (err < 0)
 544                 return err;
 545         cval->cached |= 1 << channel;
 546         cval->cache_val[index] = value;
 547         return 0;
 548 }
 549
 550 /*
 551  * TLV callback for mixer volume controls
 552  */
 553 int snd_usb_mixer_vol_tlv(struct snd_kcontrol *kcontrol, int op_flag,
 554                          unsigned int size, unsigned int __user *_tlv)
 555 {
 556         struct usb_mixer_elem_info *cval = kcontrol->private_data;
 557         DECLARE_TLV_DB_MINMAX(scale, 0, 0);
 558
 559         if (size < sizeof(scale))
 560                 return -ENOMEM;
 561         if (cval->min_mute)
 562                 scale[0] = SNDRV_CTL_TLVT_DB_MINMAX_MUTE;
 563         scale[2] = cval->dBmin;
 564         scale[3] = cval->dBmax;
 565         if (copy_to_user(_tlv, scale, sizeof(scale)))
 566                 return -EFAULT;
 567         return 0;
 568 }
 569
 570 /*
 571  * parser routines begin here...
 572  */
 573
 574 static int parse_audio_unit(struct mixer_build *state, int unitid);
 575
 576
 577 /*
 578  * check if the input/output channel routing is enabled on the given bitmap.
 579  * used for mixer unit parser
 580  */
 581 static int check_matrix_bitmap(unsigned char *bmap,
 582                                int ich, int och, int num_outs)
 583 {
 584         int idx = ich * num_outs + och;
 585         return bmap[idx >> 3] & (0x80 >> (idx & 7));
 586 }
 587
 588 /*
 589  * add an alsa control element
 590  * search and increment the index until an empty slot is found.
 591  *
 592  * if failed, give up and free the control instance.
 593  */
 594
 595 int snd_usb_mixer_add_control(struct usb_mixer_elem_list *list,
 596                               struct snd_kcontrol *kctl)
 597 {
 598         struct usb_mixer_interface *mixer = list->mixer;
 599         int err;
 600
 601         while (snd_ctl_find_id(mixer->chip->card, &kctl->id))
 602                 kctl->id.index++;
 603         if ((err = snd_ctl_add(mixer->chip->card, kctl)) < 0) {
 604                 usb_audio_dbg(mixer->chip, "cannot add control (err = %d)\n",
 605                               err);
 606                 return err;
 607         }
 608         list->kctl = kctl;
 609         list->next_id_elem = mixer->id_elems[list->id];
 610         mixer->id_elems[list->id] = list;
 611         return 0;
 612 }
 613
 614 /*
 615  * get a terminal name string
 616  */
 617
 618 static struct iterm_name_combo {
 619         int type;
 620         char *name;
 621 } iterm_names[] = {
 622         { 0x0300, "Output" },
 623         { 0x0301, "Speaker" },
 624         { 0x0302, "Headphone" },
 625         { 0x0303, "HMD Audio" },
 626         { 0x0304, "Desktop Speaker" },
 627         { 0x0305, "Room Speaker" },
 628         { 0x0306, "Com Speaker" },
 629         { 0x0307, "LFE" },
 630         { 0x0600, "External In" },
 631         { 0x0601, "Analog In" },
 632         { 0x0602, "Digital In" },
 633         { 0x0603, "Line" },
 634         { 0x0604, "Legacy In" },
 635         { 0x0605, "IEC958 In" },
 636         { 0x0606, "1394 DA Stream" },
 637         { 0x0607, "1394 DV Stream" },
 638         { 0x0700, "Embedded" },
 639         { 0x0701, "Noise Source" },
 640         { 0x0702, "Equalization Noise" },
 641         { 0x0703, "CD" },
 642         { 0x0704, "DAT" },
 643         { 0x0705, "DCC" },
 644         { 0x0706, "MiniDisk" },
 645         { 0x0707, "Analog Tape" },
 646         { 0x0708, "Phonograph" },
 647         { 0x0709, "VCR Audio" },
 648         { 0x070a, "Video Disk Audio" },
 649         { 0x070b, "DVD Audio" },
 650         { 0x070c, "TV Tuner Audio" },
 651         { 0x070d, "Satellite Rec Audio" },
 652         { 0x070e, "Cable Tuner Audio" },
 653         { 0x070f, "DSS Audio" },
 654         { 0x0710, "Radio Receiver" },
 655         { 0x0711, "Radio Transmitter" },
 656         { 0x0712, "Multi-Track Recorder" },
 657         { 0x0713, "Synthesizer" },
 658         { 0 },
 659 };
 660
 661 static int get_term_name(struct mixer_build *state, struct usb_audio_term *iterm,
 662                          unsigned char *name, int maxlen, int term_only)
 663 {
 664         struct iterm_name_combo *names;
 665         int len;
 666
 667         if (iterm->name) {
 668                 len = snd_usb_copy_string_desc(state, iterm->name,
 669                                                 name, maxlen);
 670                 if (len)
 671                         return len;
 672         }
 673
 674         /* virtual type - not a real terminal */
 675         if (iterm->type >> 16) {
 676                 if (term_only)
 677                         return 0;
 678                 switch (iterm->type >> 16) {
 679                 case UAC_SELECTOR_UNIT:
 680                         strcpy(name, "Selector");
 681                         return 8;
 682                 case UAC1_PROCESSING_UNIT:
 683                         strcpy(name, "Process Unit");
 684                         return 12;
 685                 case UAC1_EXTENSION_UNIT:
 686                         strcpy(name, "Ext Unit");
 687                         return 8;
 688                 case UAC_MIXER_UNIT:
 689                         strcpy(name, "Mixer");
 690                         return 5;
 691                 default:
 692                         return sprintf(name, "Unit %d", iterm->id);
 693                 }
 694         }
 695
 696         switch (iterm->type & 0xff00) {
 697         case 0x0100:
 698                 strcpy(name, "PCM");
 699                 return 3;
 700         case 0x0200:
 701                 strcpy(name, "Mic");
 702                 return 3;
 703         case 0x0400:
 704                 strcpy(name, "Headset");
 705                 return 7;
 706         case 0x0500:
 707                 strcpy(name, "Phone");
 708                 return 5;
 709         }
 710
 711         for (names = iterm_names; names->type; names++) {
 712                 if (names->type == iterm->type) {
 713                         strcpy(name, names->name);
 714                         return strlen(names->name);
 715                 }
 716         }
 717
 718         return 0;
 719 }
 720
 721 /*
 722  * parse the source unit recursively until it reaches to a terminal
 723  * or a branched unit.
 724  */
 725 static int check_input_term(struct mixer_build *state, int id,
 726                             struct usb_audio_term *term)
 727 {
 728         int protocol = state->mixer->protocol;
 729         int err;
 730         void *p1;
 731
 732         memset(term, 0, sizeof(*term));
 733         while ((p1 = find_audio_control_unit(state, id)) != NULL) {
 734                 unsigned char *hdr = p1;
 735                 term->id = id;
 736
 737                 if (protocol == UAC_VERSION_1 || protocol == UAC_VERSION_2) {
 738                         switch (hdr[2]) {
 739                         case UAC_INPUT_TERMINAL:
 740                                 if (protocol == UAC_VERSION_1) {
 741                                         struct uac_input_terminal_descriptor *d = p1;
 742
 743                                         term->type = le16_to_cpu(d->wTerminalType);
 744                                         term->channels = d->bNrChannels;
 745                                         term->chconfig = le16_to_cpu(d->wChannelConfig);
 746                                         term->name = d->iTerminal;
 747                                 } else { /* UAC_VERSION_2 */
 748                                         struct uac2_input_terminal_descriptor *d = p1;
 749
 750                                         /* call recursively to verify that the
 751                                          * referenced clock entity is valid */
 752                                         err = check_input_term(state, d->bCSourceID, term);
 753                                         if (err < 0)
 754                                                 return err;
 755
 756                                         /* save input term properties after recursion,
 757                                          * to ensure they are not overriden by the
 758                                          * recursion calls */
 759                                         term->id = id;
 760                                         term->type = le16_to_cpu(d->wTerminalType);
 761                                         term->channels = d->bNrChannels;
 762                                         term->chconfig = le32_to_cpu(d->bmChannelConfig);
 763                                         term->name = d->iTerminal;
 764                                 }
 765                                 return 0;
 766                         case UAC_FEATURE_UNIT: {
 767                                 /* the header is the same for v1 and v2 */
 768                                 struct uac_feature_unit_descriptor *d = p1;
 769
 770                                 id = d->bSourceID;
 771                                 break; /* continue to parse */
 772                         }
 773                         case UAC_MIXER_UNIT: {
 774                                 struct uac_mixer_unit_descriptor *d = p1;
 775
 776                                 term->type = d->bDescriptorSubtype << 16; /* virtual type */
 777                                 term->channels = uac_mixer_unit_bNrChannels(d);
 778                                 term->chconfig = uac_mixer_unit_wChannelConfig(d, protocol);
 779                                 term->name = uac_mixer_unit_iMixer(d);
 780                                 return 0;
 781                         }
 782                         case UAC_SELECTOR_UNIT:
 783                         case UAC2_CLOCK_SELECTOR: {
 784                                 struct uac_selector_unit_descriptor *d = p1;
 785                                 /* call recursively to retrieve the channel info */
 786                                 err = check_input_term(state, d->baSourceID[0], term);
 787                                 if (err < 0)
 788                                         return err;
 789                                 term->type = d->bDescriptorSubtype << 16; /* virtual type */
 790                                 term->id = id;
 791                                 term->name = uac_selector_unit_iSelector(d);
 792                                 return 0;
 793                         }
 794                         case UAC1_PROCESSING_UNIT:
 795                         case UAC1_EXTENSION_UNIT:
 796                         /* UAC2_PROCESSING_UNIT_V2 */
 797                         /* UAC2_EFFECT_UNIT */
 798                         case UAC2_EXTENSION_UNIT_V2: {
 799                                 struct uac_processing_unit_descriptor *d = p1;
 800
 801                                 if (protocol == UAC_VERSION_2 &&
 802                                         hdr[2] == UAC2_EFFECT_UNIT) {
 803                                         /* UAC2/UAC1 unit IDs overlap here in an
 804                                          * uncompatible way. Ignore this unit for now.
 805                                          */
 806                                         return 0;
 807                                 }
 808
 809                                 if (d->bNrInPins) {
 810                                         id = d->baSourceID[0];
 811                                         break; /* continue to parse */
 812                                 }
 813                                 term->type = d->bDescriptorSubtype << 16; /* virtual type */
 814                                 term->channels = uac_processing_unit_bNrChannels(d);
 815                                 term->chconfig = uac_processing_unit_wChannelConfig(d, protocol);
 816                                 term->name = uac_processing_unit_iProcessing(d, protocol);
 817                                 return 0;
 818                         }
 819                         case UAC2_CLOCK_SOURCE: {
 820                                 struct uac_clock_source_descriptor *d = p1;
 821
 822                                 term->type = d->bDescriptorSubtype << 16; /* virtual type */
 823                                 term->id = id;
 824                                 term->name = d->iClockSource;
 825                                 return 0;
 826                         }
 827                         default:
 828                                 return -ENODEV;
 829                         }
 830                 } else { /* UAC_VERSION_3 */
 831                         switch (hdr[2]) {
 832                         case UAC_INPUT_TERMINAL: {
 833                                 struct uac3_input_terminal_descriptor *d = p1;
 834
 835                                 /* call recursively to verify that the
 836                                  * referenced clock entity is valid */
 837                                 err = check_input_term(state, d->bCSourceID, term);
 838                                 if (err < 0)
 839                                         return err;
 840
 841                                 /* save input term properties after recursion,
 842                                  * to ensure they are not overriden by the
 843                                  * recursion calls */
 844                                 term->id = id;
 845                                 term->type = le16_to_cpu(d->wTerminalType);
 846
 847                                 /* REVISIT: UAC3 IT doesn't have channels/cfg */
 848                                 term->channels = 0;
 849                                 term->chconfig = 0;
 850
 851                                 term->name = le16_to_cpu(d->wTerminalDescrStr);
 852                                 return 0;
 853                         }
 854                         case UAC3_FEATURE_UNIT: {
 855                                 struct uac3_feature_unit_descriptor *d = p1;
 856
 857                                 id = d->bSourceID;
 858                                 break; /* continue to parse */
 859                         }
 860                         case UAC3_CLOCK_SOURCE: {
 861                                 struct uac3_clock_source_descriptor *d = p1;
 862
 863                                 term->type = d->bDescriptorSubtype << 16; /* virtual type */
 864                                 term->id = id;
 865                                 term->name = le16_to_cpu(d->wClockSourceStr);
 866                                 return 0;
 867                         }
 868                         default:
 869                                 return -ENODEV;
 870                         }
 871                 }
 872         }
 873         return -ENODEV;
 874 }
 875
 876 /*
 877  * Feature Unit
 878  */
 879
 880 /* feature unit control information */
 881 struct usb_feature_control_info {
 882         int control;
 883         const char *name;
 884         int type;       /* data type for uac1 */
 885         int type_uac2;  /* data type for uac2 if different from uac1, else -1 */
 886 };
 887
 888 static struct usb_feature_control_info audio_feature_info[] = {
 889         { UAC_FU_MUTE,                  "Mute",                 USB_MIXER_INV_BOOLEAN, -1 },
 890         { UAC_FU_VOLUME,                "Volume",               USB_MIXER_S16, -1 },
 891         { UAC_FU_BASS,                  "Tone Control - Bass",  USB_MIXER_S8, -1 },
 892         { UAC_FU_MID,                   "Tone Control - Mid",   USB_MIXER_S8, -1 },
 893         { UAC_FU_TREBLE,                "Tone Control - Treble", USB_MIXER_S8, -1 },
 894         { UAC_FU_GRAPHIC_EQUALIZER,     "Graphic Equalizer",    USB_MIXER_S8, -1 }, /* FIXME: not implemented yet */
 895         { UAC_FU_AUTOMATIC_GAIN,        "Auto Gain Control",    USB_MIXER_BOOLEAN, -1 },
 896         { UAC_FU_DELAY,                 "Delay Control",        USB_MIXER_U16, USB_MIXER_U32 },
 897         { UAC_FU_BASS_BOOST,            "Bass Boost",           USB_MIXER_BOOLEAN, -1 },
 898         { UAC_FU_LOUDNESS,              "Loudness",             USB_MIXER_BOOLEAN, -1 },
 899         /* UAC2 specific */
 900         { UAC2_FU_INPUT_GAIN,           "Input Gain Control",   USB_MIXER_S16, -1 },
 901         { UAC2_FU_INPUT_GAIN_PAD,       "Input Gain Pad Control", USB_MIXER_S16, -1 },
 902         { UAC2_FU_PHASE_INVERTER,        "Phase Inverter Control", USB_MIXER_BOOLEAN, -1 },
 903 };
 904
 905 /* private_free callback */
 906 void snd_usb_mixer_elem_free(struct snd_kcontrol *kctl)
 907 {
 908         kfree(kctl->private_data);
 909         kctl->private_data = NULL;
 910 }
 911
 912 /*
 913  * interface to ALSA control for feature/mixer units
 914  */
 915
 916 /* volume control quirks */
 917 static void volume_control_quirks(struct usb_mixer_elem_info *cval,
 918                                   struct snd_kcontrol *kctl)
 919 {
 920         struct snd_usb_audio *chip = cval->head.mixer->chip;
 921         switch (chip->usb_id) {
 922         case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
 923         case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
 924                 if (strcmp(kctl->id.name, "Effect Duration") == 0) {
 925                         cval->min = 0x0000;
 926                         cval->max = 0xffff;
 927                         cval->res = 0x00e6;
 928                         break;
 929                 }
 930                 if (strcmp(kctl->id.name, "Effect Volume") == 0 ||
 931                     strcmp(kctl->id.name, "Effect Feedback Volume") == 0) {
 932                         cval->min = 0x00;
 933                         cval->max = 0xff;
 934                         break;
 935                 }
 936                 if (strstr(kctl->id.name, "Effect Return") != NULL) {
 937                         cval->min = 0xb706;
 938                         cval->max = 0xff7b;
 939                         cval->res = 0x0073;
 940                         break;
 941                 }
 942                 if ((strstr(kctl->id.name, "Playback Volume") != NULL) ||
 943                         (strstr(kctl->id.name, "Effect Send") != NULL)) {
 944                         cval->min = 0xb5fb; /* -73 dB = 0xb6ff */
 945                         cval->max = 0xfcfe;
 946                         cval->res = 0x0073;
 947                 }
 948                 break;
 949
 950         case USB_ID(0x0763, 0x2081): /* M-Audio Fast Track Ultra 8R */
 951         case USB_ID(0x0763, 0x2080): /* M-Audio Fast Track Ultra */
 952                 if (strcmp(kctl->id.name, "Effect Duration") == 0) {
 953                         usb_audio_info(chip,
 954                                        "set quirk for FTU Effect Duration\n");
 955                         cval->min = 0x0000;
 956                         cval->max = 0x7f00;
 957                         cval->res = 0x0100;
 958                         break;
 959                 }
 960                 if (strcmp(kctl->id.name, "Effect Volume") == 0 ||
 961                     strcmp(kctl->id.name, "Effect Feedback Volume") == 0) {
 962                         usb_audio_info(chip,
 963                                        "set quirks for FTU Effect Feedback/Volume\n");
 964                         cval->min = 0x00;
 965                         cval->max = 0x7f;
 966                         break;
 967                 }
 968                 break;
 969
 970         case USB_ID(0x0471, 0x0101):
 971         case USB_ID(0x0471, 0x0104):
 972         case USB_ID(0x0471, 0x0105):
 973         case USB_ID(0x0672, 0x1041):
 974         /* quirk for UDA1321/N101.
 975          * note that detection between firmware 2.1.1.7 (N101)
 976          * and later 2.1.1.21 is not very clear from datasheets.
 977          * I hope that the min value is -15360 for newer firmware --jk
 978          */
 979                 if (!strcmp(kctl->id.name, "PCM Playback Volume") &&
 980                     cval->min == -15616) {
 981                         usb_audio_info(chip,
 982                                  "set volume quirk for UDA1321/N101 chip\n");
 983                         cval->max = -256;
 984                 }
 985                 break;
 986
 987         case USB_ID(0x046d, 0x09a4):
 988                 if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
 989                         usb_audio_info(chip,
 990                                 "set volume quirk for QuickCam E3500\n");
 991                         cval->min = 6080;
 992                         cval->max = 8768;
 993                         cval->res = 192;
 994                 }
 995                 break;
 996
 997         case USB_ID(0x046d, 0x0807): /* Logitech Webcam C500 */
 998         case USB_ID(0x046d, 0x0808):
 999         case USB_ID(0x046d, 0x0809):
1000         case USB_ID(0x046d, 0x0819): /* Logitech Webcam C210 */
1001         case USB_ID(0x046d, 0x081b): /* HD Webcam c310 */
1002         case USB_ID(0x046d, 0x081d): /* HD Webcam c510 */
1003         case USB_ID(0x046d, 0x0825): /* HD Webcam c270 */
1004         case USB_ID(0x046d, 0x0826): /* HD Webcam c525 */
1005         case USB_ID(0x046d, 0x08ca): /* Logitech Quickcam Fusion */
1006         case USB_ID(0x046d, 0x0991):
1007         case USB_ID(0x046d, 0x09a2): /* QuickCam Communicate Deluxe/S7500 */
1008         /* Most audio usb devices lie about volume resolution.
1009          * Most Logitech webcams have res = 384.
1010          * Probably there is some logitech magic behind this number --fishor
1011          */
1012                 if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
1013                         usb_audio_info(chip,
1014                                 "set resolution quirk: cval->res = 384\n");
1015                         cval->res = 384;
1016                 }
1017                 break;
1018         }
1019 }
1020
1021 /*
1022  * retrieve the minimum and maximum values for the specified control
1023  */
1024 static int get_min_max_with_quirks(struct usb_mixer_elem_info *cval,
1025                                    int default_min, struct snd_kcontrol *kctl)
1026 {
1027         /* for failsafe */
1028         cval->min = default_min;
1029         cval->max = cval->min + 1;
1030         cval->res = 1;
1031         cval->dBmin = cval->dBmax = 0;
1032
1033         if (cval->val_type == USB_MIXER_BOOLEAN ||
1034             cval->val_type == USB_MIXER_INV_BOOLEAN) {
1035                 cval->initialized = 1;
1036         } else {
1037                 int minchn = 0;
1038                 if (cval->cmask) {
1039                         int i;
1040                         for (i = 0; i < MAX_CHANNELS; i++)
1041                                 if (cval->cmask & (1 << i)) {
1042                                         minchn = i + 1;
1043                                         break;
1044                                 }
1045                 }
1046                 if (get_ctl_value(cval, UAC_GET_MAX, (cval->control << 8) | minchn, &cval->max) < 0 ||
1047                     get_ctl_value(cval, UAC_GET_MIN, (cval->control << 8) | minchn, &cval->min) < 0) {
1048                         usb_audio_err(cval->head.mixer->chip,
1049                                       "%d:%d: cannot get min/max values for control %d (id %d)\n",
1050                                    cval->head.id, snd_usb_ctrl_intf(cval->head.mixer->chip),
1051                                                                cval->control, cval->head.id);
1052                         return -EINVAL;
1053                 }
1054                 if (get_ctl_value(cval, UAC_GET_RES,
1055                                   (cval->control << 8) | minchn,
1056                                   &cval->res) < 0) {
1057                         cval->res = 1;
1058                 } else {
1059                         int last_valid_res = cval->res;
1060
1061                         while (cval->res > 1) {
1062                                 if (snd_usb_mixer_set_ctl_value(cval, UAC_SET_RES,
1063                                                                 (cval->control << 8) | minchn,
1064                                                                 cval->res / 2) < 0)
1065                                         break;
1066                                 cval->res /= 2;
1067                         }
1068                         if (get_ctl_value(cval, UAC_GET_RES,
1069                                           (cval->control << 8) | minchn, &cval->res) < 0)
1070                                 cval->res = last_valid_res;
1071                 }
1072                 if (cval->res == 0)
1073                         cval->res = 1;
1074
1075                 /* Additional checks for the proper resolution
1076                  *
1077                  * Some devices report smaller resolutions than actually
1078                  * reacting.  They don't return errors but simply clip
1079                  * to the lower aligned value.
1080                  */
1081                 if (cval->min + cval->res < cval->max) {
1082                         int last_valid_res = cval->res;
1083                         int saved, test, check;
1084                         get_cur_mix_raw(cval, minchn, &saved);
1085                         for (;;) {
1086                                 test = saved;
1087                                 if (test < cval->max)
1088                                         test += cval->res;
1089                                 else
1090                                         test -= cval->res;
1091                                 if (test < cval->min || test > cval->max ||
1092                                     snd_usb_set_cur_mix_value(cval, minchn, 0, test) ||
1093                                     get_cur_mix_raw(cval, minchn, &check)) {
1094                                         cval->res = last_valid_res;
1095                                         break;
1096                                 }
1097                                 if (test == check)
1098                                         break;
1099                                 cval->res *= 2;
1100                         }
1101                         snd_usb_set_cur_mix_value(cval, minchn, 0, saved);
1102                 }
1103
1104                 cval->initialized = 1;
1105         }
1106
1107         if (kctl)
1108                 volume_control_quirks(cval, kctl);
1109
1110         /* USB descriptions contain the dB scale in 1/256 dB unit
1111          * while ALSA TLV contains in 1/100 dB unit
1112          */
1113         cval->dBmin = (convert_signed_value(cval, cval->min) * 100) / 256;
1114         cval->dBmax = (convert_signed_value(cval, cval->max) * 100) / 256;
1115         if (cval->dBmin > cval->dBmax) {
1116                 /* something is wrong; assume it's either from/to 0dB */
1117                 if (cval->dBmin < 0)
1118                         cval->dBmax = 0;
1119                 else if (cval->dBmin > 0)
1120                         cval->dBmin = 0;
1121                 if (cval->dBmin > cval->dBmax) {
1122                         /* totally crap, return an error */
1123                         return -EINVAL;
1124                 }
1125         }
1126
1127         return 0;
1128 }
1129
1130 #define get_min_max(cval, def)  get_min_max_with_quirks(cval, def, NULL)
1131
1132 /* get a feature/mixer unit info */
1133 static int mixer_ctl_feature_info(struct snd_kcontrol *kcontrol,
1134                                   struct snd_ctl_elem_info *uinfo)
1135 {
1136         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1137
1138         if (cval->val_type == USB_MIXER_BOOLEAN ||
1139             cval->val_type == USB_MIXER_INV_BOOLEAN)
1140                 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1141         else
1142                 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
1143         uinfo->count = cval->channels;
1144         if (cval->val_type == USB_MIXER_BOOLEAN ||
1145             cval->val_type == USB_MIXER_INV_BOOLEAN) {
1146                 uinfo->value.integer.min = 0;
1147                 uinfo->value.integer.max = 1;
1148         } else {
1149                 if (!cval->initialized) {
1150                         get_min_max_with_quirks(cval, 0, kcontrol);
1151                         if (cval->initialized && cval->dBmin >= cval->dBmax) {
1152                                 kcontrol->vd[0].access &=
1153                                         ~(SNDRV_CTL_ELEM_ACCESS_TLV_READ |
1154                                           SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK);
1155                                 snd_ctl_notify(cval->head.mixer->chip->card,
1156                                                SNDRV_CTL_EVENT_MASK_INFO,
1157                                                &kcontrol->id);
1158                         }
1159                 }
1160                 uinfo->value.integer.min = 0;
1161                 uinfo->value.integer.max =
1162                         (cval->max - cval->min + cval->res - 1) / cval->res;
1163         }
1164         return 0;
1165 }
1166
1167 /* get the current value from feature/mixer unit */
1168 static int mixer_ctl_feature_get(struct snd_kcontrol *kcontrol,
1169                                  struct snd_ctl_elem_value *ucontrol)
1170 {
1171         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1172         int c, cnt, val, err;
1173
1174         ucontrol->value.integer.value[0] = cval->min;
1175         if (cval->cmask) {
1176                 cnt = 0;
1177                 for (c = 0; c < MAX_CHANNELS; c++) {
1178                         if (!(cval->cmask & (1 << c)))
1179                                 continue;
1180                         err = snd_usb_get_cur_mix_value(cval, c + 1, cnt, &val);
1181                         if (err < 0)
1182                                 return filter_error(cval, err);
1183                         val = get_relative_value(cval, val);
1184                         ucontrol->value.integer.value[cnt] = val;
1185                         cnt++;
1186                 }
1187                 return 0;
1188         } else {
1189                 /* master channel */
1190                 err = snd_usb_get_cur_mix_value(cval, 0, 0, &val);
1191                 if (err < 0)
1192                         return filter_error(cval, err);
1193                 val = get_relative_value(cval, val);
1194                 ucontrol->value.integer.value[0] = val;
1195         }
1196         return 0;
1197 }
1198
1199 /* put the current value to feature/mixer unit */
1200 static int mixer_ctl_feature_put(struct snd_kcontrol *kcontrol,
1201                                  struct snd_ctl_elem_value *ucontrol)
1202 {
1203         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1204         int c, cnt, val, oval, err;
1205         int changed = 0;
1206
1207         if (cval->cmask) {
1208                 cnt = 0;
1209                 for (c = 0; c < MAX_CHANNELS; c++) {
1210                         if (!(cval->cmask & (1 << c)))
1211                                 continue;
1212                         err = snd_usb_get_cur_mix_value(cval, c + 1, cnt, &oval);
1213                         if (err < 0)
1214                                 return filter_error(cval, err);
1215                         val = ucontrol->value.integer.value[cnt];
1216                         val = get_abs_value(cval, val);
1217                         if (oval != val) {
1218                                 snd_usb_set_cur_mix_value(cval, c + 1, cnt, val);
1219                                 changed = 1;
1220                         }
1221                         cnt++;
1222                 }
1223         } else {
1224                 /* master channel */
1225                 err = snd_usb_get_cur_mix_value(cval, 0, 0, &oval);
1226                 if (err < 0)
1227                         return filter_error(cval, err);
1228                 val = ucontrol->value.integer.value[0];
1229                 val = get_abs_value(cval, val);
1230                 if (val != oval) {
1231                         snd_usb_set_cur_mix_value(cval, 0, 0, val);
1232                         changed = 1;
1233                 }
1234         }
1235         return changed;
1236 }
1237
1238 /* get the boolean value from the master channel of a UAC control */
1239 static int mixer_ctl_master_bool_get(struct snd_kcontrol *kcontrol,
1240                                      struct snd_ctl_elem_value *ucontrol)
1241 {
1242         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1243         int val, err;
1244
1245         err = snd_usb_get_cur_mix_value(cval, 0, 0, &val);
1246         if (err < 0)
1247                 return filter_error(cval, err);
1248         val = (val != 0);
1249         ucontrol->value.integer.value[0] = val;
1250         return 0;
1251 }
1252
1253 static struct snd_kcontrol_new usb_feature_unit_ctl = {
1254         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1255         .name = "", /* will be filled later manually */
1256         .info = mixer_ctl_feature_info,
1257         .get = mixer_ctl_feature_get,
1258         .put = mixer_ctl_feature_put,
1259 };
1260
1261 /* the read-only variant */
1262 static const struct snd_kcontrol_new usb_feature_unit_ctl_ro = {
1263         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1264         .name = "", /* will be filled later manually */
1265         .info = mixer_ctl_feature_info,
1266         .get = mixer_ctl_feature_get,
1267         .put = NULL,
1268 };
1269
1270 /*
1271  * A control which shows the boolean value from reading a UAC control on
1272  * the master channel.
1273  */
1274 static struct snd_kcontrol_new usb_bool_master_control_ctl_ro = {
1275         .iface = SNDRV_CTL_ELEM_IFACE_CARD,
1276         .name = "", /* will be filled later manually */
1277         .access = SNDRV_CTL_ELEM_ACCESS_READ,
1278         .info = snd_ctl_boolean_mono_info,
1279         .get = mixer_ctl_master_bool_get,
1280         .put = NULL,
1281 };
1282
1283 /*
1284  * This symbol is exported in order to allow the mixer quirks to
1285  * hook up to the standard feature unit control mechanism
1286  */
1287 struct snd_kcontrol_new *snd_usb_feature_unit_ctl = &usb_feature_unit_ctl;
1288
1289 /*
1290  * build a feature control
1291  */
1292 static size_t append_ctl_name(struct snd_kcontrol *kctl, const char *str)
1293 {
1294         return strlcat(kctl->id.name, str, sizeof(kctl->id.name));
1295 }
1296
1297 /*
1298  * A lot of headsets/headphones have a "Speaker" mixer. Make sure we
1299  * rename it to "Headphone". We determine if something is a headphone
1300  * similar to how udev determines form factor.
1301  */
1302 static void check_no_speaker_on_headset(struct snd_kcontrol *kctl,
1303                                         struct snd_card *card)
1304 {
1305         const char *names_to_check[] = {
1306                 "Headset", "headset", "Headphone", "headphone", NULL};
1307         const char **s;
1308         bool found = false;
1309
1310         if (strcmp("Speaker", kctl->id.name))
1311                 return;
1312
1313         for (s = names_to_check; *s; s++)
1314                 if (strstr(card->shortname, *s)) {
1315                         found = true;
1316                         break;
1317                 }
1318
1319         if (!found)
1320                 return;
1321
1322         strlcpy(kctl->id.name, "Headphone", sizeof(kctl->id.name));
1323 }
1324
1325 static struct usb_feature_control_info *get_feature_control_info(int control)
1326 {
1327         int i;
1328
1329         for (i = 0; i < ARRAY_SIZE(audio_feature_info); ++i) {
1330                 if (audio_feature_info[i].control == control)
1331                         return &audio_feature_info[i];
1332         }
1333         return NULL;
1334 }
1335
1336 static void build_feature_ctl(struct mixer_build *state, void *raw_desc,
1337                               unsigned int ctl_mask, int control,
1338                               struct usb_audio_term *iterm, int unitid,
1339                               int readonly_mask)
1340 {
1341         struct uac_feature_unit_descriptor *desc = raw_desc;
1342         struct usb_feature_control_info *ctl_info;
1343         unsigned int len = 0;
1344         int mapped_name = 0;
1345         int nameid = uac_feature_unit_iFeature(desc);
1346         struct snd_kcontrol *kctl;
1347         struct usb_mixer_elem_info *cval;
1348         const struct usbmix_name_map *map;
1349         unsigned int range;
1350
1351         if (control == UAC_FU_GRAPHIC_EQUALIZER) {
1352                 /* FIXME: not supported yet */
1353                 return;
1354         }
1355
1356         map = find_map(state, unitid, control);
1357         if (check_ignored_ctl(map))
1358                 return;
1359
1360         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1361         if (!cval)
1362                 return;
1363         snd_usb_mixer_elem_init_std(&cval->head, state->mixer, unitid);
1364         cval->control = control;
1365         cval->cmask = ctl_mask;
1366
1367         ctl_info = get_feature_control_info(control);
1368         if (!ctl_info) {
1369                 kfree(cval);
1370                 return;
1371         }
1372         if (state->mixer->protocol == UAC_VERSION_1)
1373                 cval->val_type = ctl_info->type;
1374         else /* UAC_VERSION_2 */
1375                 cval->val_type = ctl_info->type_uac2 >= 0 ?
1376                         ctl_info->type_uac2 : ctl_info->type;
1377
1378         if (ctl_mask == 0) {
1379                 cval->channels = 1;     /* master channel */
1380                 cval->master_readonly = readonly_mask;
1381         } else {
1382                 int i, c = 0;
1383                 for (i = 0; i < 16; i++)
1384                         if (ctl_mask & (1 << i))
1385                                 c++;
1386                 cval->channels = c;
1387                 cval->ch_readonly = readonly_mask;
1388         }
1389
1390         /*
1391          * If all channels in the mask are marked read-only, make the control
1392          * read-only. snd_usb_set_cur_mix_value() will check the mask again and won't
1393          * issue write commands to read-only channels.
1394          */
1395         if (cval->channels == readonly_mask)
1396                 kctl = snd_ctl_new1(&usb_feature_unit_ctl_ro, cval);
1397         else
1398                 kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
1399
1400         if (!kctl) {
1401                 usb_audio_err(state->chip, "cannot malloc kcontrol\n");
1402                 kfree(cval);
1403                 return;
1404         }
1405         kctl->private_free = snd_usb_mixer_elem_free;
1406
1407         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
1408         mapped_name = len != 0;
1409         if (!len && nameid)
1410                 len = snd_usb_copy_string_desc(state, nameid,
1411                                 kctl->id.name, sizeof(kctl->id.name));
1412
1413         switch (control) {
1414         case UAC_FU_MUTE:
1415         case UAC_FU_VOLUME:
1416                 /*
1417                  * determine the control name.  the rule is:
1418                  * - if a name id is given in descriptor, use it.
1419                  * - if the connected input can be determined, then use the name
1420                  *   of terminal type.
1421                  * - if the connected output can be determined, use it.
1422                  * - otherwise, anonymous name.
1423                  */
1424                 if (!len) {
1425                         len = get_term_name(state, iterm, kctl->id.name,
1426                                             sizeof(kctl->id.name), 1);
1427                         if (!len)
1428                                 len = get_term_name(state, &state->oterm,
1429                                                     kctl->id.name,
1430                                                     sizeof(kctl->id.name), 1);
1431                         if (!len)
1432                                 snprintf(kctl->id.name, sizeof(kctl->id.name),
1433                                          "Feature %d", unitid);
1434                 }
1435
1436                 if (!mapped_name)
1437                         check_no_speaker_on_headset(kctl, state->mixer->chip->card);
1438
1439                 /*
1440                  * determine the stream direction:
1441                  * if the connected output is USB stream, then it's likely a
1442                  * capture stream.  otherwise it should be playback (hopefully :)
1443                  */
1444                 if (!mapped_name && !(state->oterm.type >> 16)) {
1445                         if ((state->oterm.type & 0xff00) == 0x0100)
1446                                 append_ctl_name(kctl, " Capture");
1447                         else
1448                                 append_ctl_name(kctl, " Playback");
1449                 }
1450                 append_ctl_name(kctl, control == UAC_FU_MUTE ?
1451                                 " Switch" : " Volume");
1452                 break;
1453         default:
1454                 if (!len)
1455                         strlcpy(kctl->id.name, audio_feature_info[control-1].name,
1456                                 sizeof(kctl->id.name));
1457                 break;
1458         }
1459
1460         /* get min/max values */
1461         get_min_max_with_quirks(cval, 0, kctl);
1462
1463         if (control == UAC_FU_VOLUME) {
1464                 check_mapped_dB(map, cval);
1465                 if (cval->dBmin < cval->dBmax || !cval->initialized) {
1466                         kctl->tlv.c = snd_usb_mixer_vol_tlv;
1467                         kctl->vd[0].access |=
1468                                 SNDRV_CTL_ELEM_ACCESS_TLV_READ |
1469                                 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
1470                 }
1471         }
1472
1473         snd_usb_mixer_fu_apply_quirk(state->mixer, cval, unitid, kctl);
1474
1475         range = (cval->max - cval->min) / cval->res;
1476         /*
1477          * Are there devices with volume range more than 255? I use a bit more
1478          * to be sure. 384 is a resolution magic number found on Logitech
1479          * devices. It will definitively catch all buggy Logitech devices.
1480          */
1481         if (range > 384) {
1482                 usb_audio_warn(state->chip,
1483                                "Warning! Unlikely big volume range (=%u), cval->res is probably wrong.",
1484                                range);
1485                 usb_audio_warn(state->chip,
1486                                "[%d] FU [%s] ch = %d, val = %d/%d/%d",
1487                                cval->head.id, kctl->id.name, cval->channels,
1488                                cval->min, cval->max, cval->res);
1489         }
1490
1491         usb_audio_dbg(state->chip, "[%d] FU [%s] ch = %d, val = %d/%d/%d\n",
1492                       cval->head.id, kctl->id.name, cval->channels,
1493                       cval->min, cval->max, cval->res);
1494         snd_usb_mixer_add_control(&cval->head, kctl);
1495 }
1496
1497 static void get_connector_control_name(struct mixer_build *state,
1498                                        struct usb_audio_term *term,
1499                                        bool is_input, char *name, int name_size)
1500 {
1501         int name_len = get_term_name(state, term, name, name_size, 0);
1502
1503         if (name_len == 0)
1504                 strlcpy(name, "Unknown", name_size);
1505
1506         /*
1507          *  sound/core/ctljack.c has a convention of naming jack controls
1508          * by ending in " Jack".  Make it slightly more useful by
1509          * indicating Input or Output after the terminal name.
1510          */
1511         if (is_input)
1512                 strlcat(name, " - Input Jack", name_size);
1513         else
1514                 strlcat(name, " - Output Jack", name_size);
1515 }
1516
1517 /* Build a mixer control for a UAC connector control (jack-detect) */
1518 static void build_connector_control(struct mixer_build *state,
1519                                     struct usb_audio_term *term, bool is_input)
1520 {
1521         struct snd_kcontrol *kctl;
1522         struct usb_mixer_elem_info *cval;
1523
1524         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1525         if (!cval)
1526                 return;
1527         snd_usb_mixer_elem_init_std(&cval->head, state->mixer, term->id);
1528         /*
1529          * The first byte from reading the UAC2_TE_CONNECTOR control returns the
1530          * number of channels connected.  This boolean ctl will simply report
1531          * if any channels are connected or not.
1532          * (Audio20_final.pdf Table 5-10: Connector Control CUR Parameter Block)
1533          */
1534         cval->control = UAC2_TE_CONNECTOR;
1535         cval->val_type = USB_MIXER_BOOLEAN;
1536         cval->channels = 1; /* report true if any channel is connected */
1537         cval->min = 0;
1538         cval->max = 1;
1539         kctl = snd_ctl_new1(&usb_bool_master_control_ctl_ro, cval);
1540         if (!kctl) {
1541                 usb_audio_err(state->chip, "cannot malloc kcontrol\n");
1542                 kfree(cval);
1543                 return;
1544         }
1545         get_connector_control_name(state, term, is_input, kctl->id.name,
1546                                    sizeof(kctl->id.name));
1547         kctl->private_free = snd_usb_mixer_elem_free;
1548         snd_usb_mixer_add_control(&cval->head, kctl);
1549 }
1550
1551 static int parse_clock_source_unit(struct mixer_build *state, int unitid,
1552                                    void *_ftr)
1553 {
1554         struct uac_clock_source_descriptor *hdr = _ftr;
1555         struct usb_mixer_elem_info *cval;
1556         struct snd_kcontrol *kctl;
1557         char name[SNDRV_CTL_ELEM_ID_NAME_MAXLEN];
1558         int ret;
1559
1560         if (state->mixer->protocol != UAC_VERSION_2)
1561                 return -EINVAL;
1562
1563         if (hdr->bLength != sizeof(*hdr)) {
1564                 usb_audio_dbg(state->chip,
1565                               "Bogus clock source descriptor length of %d, ignoring.\n",
1566                               hdr->bLength);
1567                 return 0;
1568         }
1569
1570         /*
1571          * The only property of this unit we are interested in is the
1572          * clock source validity. If that isn't readable, just bail out.
1573          */
1574         if (!uac_v2v3_control_is_readable(hdr->bmControls,
1575                                       UAC2_CS_CONTROL_CLOCK_VALID))
1576                 return 0;
1577
1578         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1579         if (!cval)
1580                 return -ENOMEM;
1581
1582         snd_usb_mixer_elem_init_std(&cval->head, state->mixer, hdr->bClockID);
1583
1584         cval->min = 0;
1585         cval->max = 1;
1586         cval->channels = 1;
1587         cval->val_type = USB_MIXER_BOOLEAN;
1588         cval->control = UAC2_CS_CONTROL_CLOCK_VALID;
1589
1590         cval->master_readonly = 1;
1591         /* From UAC2 5.2.5.1.2 "Only the get request is supported." */
1592         kctl = snd_ctl_new1(&usb_bool_master_control_ctl_ro, cval);
1593
1594         if (!kctl) {
1595                 kfree(cval);
1596                 return -ENOMEM;
1597         }
1598
1599         kctl->private_free = snd_usb_mixer_elem_free;
1600         ret = snd_usb_copy_string_desc(state, hdr->iClockSource,
1601                                        name, sizeof(name));
1602         if (ret > 0)
1603                 snprintf(kctl->id.name, sizeof(kctl->id.name),
1604                          "%s Validity", name);
1605         else
1606                 snprintf(kctl->id.name, sizeof(kctl->id.name),
1607                          "Clock Source %d Validity", hdr->bClockID);
1608
1609         return snd_usb_mixer_add_control(&cval->head, kctl);
1610 }
1611
1612 /*
1613  * parse a feature unit
1614  *
1615  * most of controls are defined here.
1616  */
1617 static int parse_audio_feature_unit(struct mixer_build *state, int unitid,
1618                                     void *_ftr)
1619 {
1620         int channels, i, j;
1621         struct usb_audio_term iterm;
1622         unsigned int master_bits, first_ch_bits;
1623         int err, csize;
1624         struct uac_feature_unit_descriptor *hdr = _ftr;
1625         __u8 *bmaControls;
1626
1627         if (state->mixer->protocol == UAC_VERSION_1) {
1628                 if (hdr->bLength < 7) {
1629                         usb_audio_err(state->chip,
1630                                       "unit %u: invalid UAC_FEATURE_UNIT descriptor\n",
1631                                       unitid);
1632                         return -EINVAL;
1633                 }
1634                 csize = hdr->bControlSize;
1635                 if (!csize) {
1636                         usb_audio_dbg(state->chip,
1637                                       "unit %u: invalid bControlSize == 0\n",
1638                                       unitid);
1639                         return -EINVAL;
1640                 }
1641                 channels = (hdr->bLength - 7) / csize - 1;
1642                 bmaControls = hdr->bmaControls;
1643                 if (hdr->bLength < 7 + csize) {
1644                         usb_audio_err(state->chip,
1645                                       "unit %u: invalid UAC_FEATURE_UNIT descriptor\n",
1646                                       unitid);
1647                         return -EINVAL;
1648                 }
1649         } else if (state->mixer->protocol == UAC_VERSION_2) {
1650                 struct uac2_feature_unit_descriptor *ftr = _ftr;
1651                 if (hdr->bLength < 6) {
1652                         usb_audio_err(state->chip,
1653                                       "unit %u: invalid UAC_FEATURE_UNIT descriptor\n",
1654                                       unitid);
1655                         return -EINVAL;
1656                 }
1657                 csize = 4;
1658                 channels = (hdr->bLength - 6) / 4 - 1;
1659                 bmaControls = ftr->bmaControls;
1660                 if (hdr->bLength < 6 + csize) {
1661                         usb_audio_err(state->chip,
1662                                       "unit %u: invalid UAC_FEATURE_UNIT descriptor\n",
1663                                       unitid);
1664                         return -EINVAL;
1665                 }
1666         } else { /* UAC_VERSION_3 */
1667                 struct uac3_feature_unit_descriptor *ftr = _ftr;
1668
1669                 if (hdr->bLength < 7) {
1670                         usb_audio_err(state->chip,
1671                                       "unit %u: invalid UAC3_FEATURE_UNIT descriptor\n",
1672                                       unitid);
1673                         return -EINVAL;
1674                 }
1675                 csize = 4;
1676                 channels = (ftr->bLength - 7) / 4 - 1;
1677                 bmaControls = ftr->bmaControls;
1678                 if (hdr->bLength < 7 + csize) {
1679                         usb_audio_err(state->chip,
1680                                       "unit %u: invalid UAC3_FEATURE_UNIT descriptor\n",
1681                                       unitid);
1682                         return -EINVAL;
1683                 }
1684         }
1685
1686         /* parse the source unit */
1687         if ((err = parse_audio_unit(state, hdr->bSourceID)) < 0)
1688                 return err;
1689
1690         /* determine the input source type and name */
1691         err = check_input_term(state, hdr->bSourceID, &iterm);
1692         if (err < 0)
1693                 return err;
1694
1695         master_bits = snd_usb_combine_bytes(bmaControls, csize);
1696         /* master configuration quirks */
1697         switch (state->chip->usb_id) {
1698         case USB_ID(0x08bb, 0x2702):
1699                 usb_audio_info(state->chip,
1700                                "usbmixer: master volume quirk for PCM2702 chip\n");
1701                 /* disable non-functional volume control */
1702                 master_bits &= ~UAC_CONTROL_BIT(UAC_FU_VOLUME);
1703                 break;
1704         case USB_ID(0x1130, 0xf211):
1705                 usb_audio_info(state->chip,
1706                                "usbmixer: volume control quirk for Tenx TP6911 Audio Headset\n");
1707                 /* disable non-functional volume control */
1708                 channels = 0;
1709                 break;
1710
1711         }
1712         if (channels > 0)
1713                 first_ch_bits = snd_usb_combine_bytes(bmaControls + csize, csize);
1714         else
1715                 first_ch_bits = 0;
1716
1717         if (state->mixer->protocol == UAC_VERSION_1) {
1718                 /* check all control types */
1719                 for (i = 0; i < 10; i++) {
1720                         unsigned int ch_bits = 0;
1721                         int control = audio_feature_info[i].control;
1722
1723                         for (j = 0; j < channels; j++) {
1724                                 unsigned int mask;
1725
1726                                 mask = snd_usb_combine_bytes(bmaControls +
1727                                                              csize * (j+1), csize);
1728                                 if (mask & (1 << i))
1729                                         ch_bits |= (1 << j);
1730                         }
1731                         /* audio class v1 controls are never read-only */
1732
1733                         /*
1734                          * The first channel must be set
1735                          * (for ease of programming).
1736                          */
1737                         if (ch_bits & 1)
1738                                 build_feature_ctl(state, _ftr, ch_bits, control,
1739                                                   &iterm, unitid, 0);
1740                         if (master_bits & (1 << i))
1741                                 build_feature_ctl(state, _ftr, 0, control,
1742                                                   &iterm, unitid, 0);
1743                 }
1744         } else { /* UAC_VERSION_2/3 */
1745                 for (i = 0; i < ARRAY_SIZE(audio_feature_info); i++) {
1746                         unsigned int ch_bits = 0;
1747                         unsigned int ch_read_only = 0;
1748                         int control = audio_feature_info[i].control;
1749
1750                         for (j = 0; j < channels; j++) {
1751                                 unsigned int mask;
1752
1753                                 mask = snd_usb_combine_bytes(bmaControls +
1754                                                              csize * (j+1), csize);
1755                                 if (uac_v2v3_control_is_readable(mask, control)) {
1756                                         ch_bits |= (1 << j);
1757                                         if (!uac_v2v3_control_is_writeable(mask, control))
1758                                                 ch_read_only |= (1 << j);
1759                                 }
1760                         }
1761
1762                         /*
1763                          * NOTE: build_feature_ctl() will mark the control
1764                          * read-only if all channels are marked read-only in
1765                          * the descriptors. Otherwise, the control will be
1766                          * reported as writeable, but the driver will not
1767                          * actually issue a write command for read-only
1768                          * channels.
1769                          */
1770
1771                         /*
1772                          * The first channel must be set
1773                          * (for ease of programming).
1774                          */
1775                         if (ch_bits & 1)
1776                                 build_feature_ctl(state, _ftr, ch_bits, control,
1777                                                   &iterm, unitid, ch_read_only);
1778                         if (uac_v2v3_control_is_readable(master_bits, control))
1779                                 build_feature_ctl(state, _ftr, 0, control,
1780                                                   &iterm, unitid,
1781                                                   !uac_v2v3_control_is_writeable(master_bits,
1782                                                                                  control));
1783                 }
1784         }
1785
1786         return 0;
1787 }
1788
1789 /*
1790  * Mixer Unit
1791  */
1792
1793 /*
1794  * build a mixer unit control
1795  *
1796  * the callbacks are identical with feature unit.
1797  * input channel number (zero based) is given in control field instead.
1798  */
1799 static void build_mixer_unit_ctl(struct mixer_build *state,
1800                                  struct uac_mixer_unit_descriptor *desc,
1801                                  int in_pin, int in_ch, int unitid,
1802                                  struct usb_audio_term *iterm)
1803 {
1804         struct usb_mixer_elem_info *cval;
1805         unsigned int num_outs = uac_mixer_unit_bNrChannels(desc);
1806         unsigned int i, len;
1807         struct snd_kcontrol *kctl;
1808         const struct usbmix_name_map *map;
1809
1810         map = find_map(state, unitid, 0);
1811         if (check_ignored_ctl(map))
1812                 return;
1813
1814         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1815         if (!cval)
1816                 return;
1817
1818         snd_usb_mixer_elem_init_std(&cval->head, state->mixer, unitid);
1819         cval->control = in_ch + 1; /* based on 1 */
1820         cval->val_type = USB_MIXER_S16;
1821         for (i = 0; i < num_outs; i++) {
1822                 __u8 *c = uac_mixer_unit_bmControls(desc, state->mixer->protocol);
1823
1824                 if (check_matrix_bitmap(c, in_ch, i, num_outs)) {
1825                         cval->cmask |= (1 << i);
1826                         cval->channels++;
1827                 }
1828         }
1829
1830         /* get min/max values */
1831         get_min_max(cval, 0);
1832
1833         kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
1834         if (!kctl) {
1835                 usb_audio_err(state->chip, "cannot malloc kcontrol\n");
1836                 kfree(cval);
1837                 return;
1838         }
1839         kctl->private_free = snd_usb_mixer_elem_free;
1840
1841         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
1842         if (!len)
1843                 len = get_term_name(state, iterm, kctl->id.name,
1844                                     sizeof(kctl->id.name), 0);
1845         if (!len)
1846                 len = sprintf(kctl->id.name, "Mixer Source %d", in_ch + 1);
1847         append_ctl_name(kctl, " Volume");
1848
1849         usb_audio_dbg(state->chip, "[%d] MU [%s] ch = %d, val = %d/%d\n",
1850                     cval->head.id, kctl->id.name, cval->channels, cval->min, cval->max);
1851         snd_usb_mixer_add_control(&cval->head, kctl);
1852 }
1853
1854 static int parse_audio_input_terminal(struct mixer_build *state, int unitid,
1855                                       void *raw_desc)
1856 {
1857         struct usb_audio_term iterm;
1858         struct uac2_input_terminal_descriptor *d = raw_desc;
1859
1860         check_input_term(state, d->bTerminalID, &iterm);
1861         if (state->mixer->protocol == UAC_VERSION_2) {
1862                 /* Check for jack detection. */
1863                 if (uac_v2v3_control_is_readable(le16_to_cpu(d->bmControls),
1864                                                  UAC2_TE_CONNECTOR)) {
1865                         build_connector_control(state, &iterm, true);
1866                 }
1867         }
1868         return 0;
1869 }
1870
1871 /*
1872  * parse a mixer unit
1873  */
1874 static int parse_audio_mixer_unit(struct mixer_build *state, int unitid,
1875                                   void *raw_desc)
1876 {
1877         struct uac_mixer_unit_descriptor *desc = raw_desc;
1878         struct usb_audio_term iterm;
1879         int input_pins, num_ins, num_outs;
1880         int pin, ich, err;
1881
1882         if (desc->bLength < 11 || !(input_pins = desc->bNrInPins) ||
1883             !(num_outs = uac_mixer_unit_bNrChannels(desc))) {
1884                 usb_audio_err(state->chip,
1885                               "invalid MIXER UNIT descriptor %d\n",
1886                               unitid);
1887                 return -EINVAL;
1888         }
1889
1890         num_ins = 0;
1891         ich = 0;
1892         for (pin = 0; pin < input_pins; pin++) {
1893                 err = parse_audio_unit(state, desc->baSourceID[pin]);
1894                 if (err < 0)
1895                         continue;
1896                 /* no bmControls field (e.g. Maya44) -> ignore */
1897                 if (desc->bLength <= 10 + input_pins)
1898                         continue;
1899                 err = check_input_term(state, desc->baSourceID[pin], &iterm);
1900                 if (err < 0)
1901                         return err;
1902                 num_ins += iterm.channels;
1903                 for (; ich < num_ins; ich++) {
1904                         int och, ich_has_controls = 0;
1905
1906                         for (och = 0; och < num_outs; och++) {
1907                                 __u8 *c = uac_mixer_unit_bmControls(desc,
1908                                                 state->mixer->protocol);
1909
1910                                 if (check_matrix_bitmap(c, ich, och, num_outs)) {
1911                                         ich_has_controls = 1;
1912                                         break;
1913                                 }
1914                         }
1915                         if (ich_has_controls)
1916                                 build_mixer_unit_ctl(state, desc, pin, ich,
1917                                                      unitid, &iterm);
1918                 }
1919         }
1920         return 0;
1921 }
1922
1923 /*
1924  * Processing Unit / Extension Unit
1925  */
1926
1927 /* get callback for processing/extension unit */
1928 static int mixer_ctl_procunit_get(struct snd_kcontrol *kcontrol,
1929                                   struct snd_ctl_elem_value *ucontrol)
1930 {
1931         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1932         int err, val;
1933
1934         err = get_cur_ctl_value(cval, cval->control << 8, &val);
1935         if (err < 0) {
1936                 ucontrol->value.integer.value[0] = cval->min;
1937                 return filter_error(cval, err);
1938         }
1939         val = get_relative_value(cval, val);
1940         ucontrol->value.integer.value[0] = val;
1941         return 0;
1942 }
1943
1944 /* put callback for processing/extension unit */
1945 static int mixer_ctl_procunit_put(struct snd_kcontrol *kcontrol,
1946                                   struct snd_ctl_elem_value *ucontrol)
1947 {
1948         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1949         int val, oval, err;
1950
1951         err = get_cur_ctl_value(cval, cval->control << 8, &oval);
1952         if (err < 0)
1953                 return filter_error(cval, err);
1954         val = ucontrol->value.integer.value[0];
1955         val = get_abs_value(cval, val);
1956         if (val != oval) {
1957                 set_cur_ctl_value(cval, cval->control << 8, val);
1958                 return 1;
1959         }
1960         return 0;
1961 }
1962
1963 /* alsa control interface for processing/extension unit */
1964 static const struct snd_kcontrol_new mixer_procunit_ctl = {
1965         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1966         .name = "", /* will be filled later */
1967         .info = mixer_ctl_feature_info,
1968         .get = mixer_ctl_procunit_get,
1969         .put = mixer_ctl_procunit_put,
1970 };
1971
1972 /*
1973  * predefined data for processing units
1974  */
1975 struct procunit_value_info {
1976         int control;
1977         char *suffix;
1978         int val_type;
1979         int min_value;
1980 };
1981
1982 struct procunit_info {
1983         int type;
1984         char *name;
1985         struct procunit_value_info *values;
1986 };
1987
1988 static struct procunit_value_info updown_proc_info[] = {
1989         { UAC_UD_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1990         { UAC_UD_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
1991         { 0 }
1992 };
1993 static struct procunit_value_info prologic_proc_info[] = {
1994         { UAC_DP_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1995         { UAC_DP_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
1996         { 0 }
1997 };
1998 static struct procunit_value_info threed_enh_proc_info[] = {
1999         { UAC_3D_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2000         { UAC_3D_SPACE, "Spaciousness", USB_MIXER_U8 },
2001         { 0 }
2002 };
2003 static struct procunit_value_info reverb_proc_info[] = {
2004         { UAC_REVERB_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2005         { UAC_REVERB_LEVEL, "Level", USB_MIXER_U8 },
2006         { UAC_REVERB_TIME, "Time", USB_MIXER_U16 },
2007         { UAC_REVERB_FEEDBACK, "Feedback", USB_MIXER_U8 },
2008         { 0 }
2009 };
2010 static struct procunit_value_info chorus_proc_info[] = {
2011         { UAC_CHORUS_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2012         { UAC_CHORUS_LEVEL, "Level", USB_MIXER_U8 },
2013         { UAC_CHORUS_RATE, "Rate", USB_MIXER_U16 },
2014         { UAC_CHORUS_DEPTH, "Depth", USB_MIXER_U16 },
2015         { 0 }
2016 };
2017 static struct procunit_value_info dcr_proc_info[] = {
2018         { UAC_DCR_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2019         { UAC_DCR_RATE, "Ratio", USB_MIXER_U16 },
2020         { UAC_DCR_MAXAMPL, "Max Amp", USB_MIXER_S16 },
2021         { UAC_DCR_THRESHOLD, "Threshold", USB_MIXER_S16 },
2022         { UAC_DCR_ATTACK_TIME, "Attack Time", USB_MIXER_U16 },
2023         { UAC_DCR_RELEASE_TIME, "Release Time", USB_MIXER_U16 },
2024         { 0 }
2025 };
2026
2027 static struct procunit_info procunits[] = {
2028         { UAC_PROCESS_UP_DOWNMIX, "Up Down", updown_proc_info },
2029         { UAC_PROCESS_DOLBY_PROLOGIC, "Dolby Prologic", prologic_proc_info },
2030         { UAC_PROCESS_STEREO_EXTENDER, "3D Stereo Extender", threed_enh_proc_info },
2031         { UAC_PROCESS_REVERB, "Reverb", reverb_proc_info },
2032         { UAC_PROCESS_CHORUS, "Chorus", chorus_proc_info },
2033         { UAC_PROCESS_DYN_RANGE_COMP, "DCR", dcr_proc_info },
2034         { 0 },
2035 };
2036 /*
2037  * predefined data for extension units
2038  */
2039 static struct procunit_value_info clock_rate_xu_info[] = {
2040         { USB_XU_CLOCK_RATE_SELECTOR, "Selector", USB_MIXER_U8, 0 },
2041         { 0 }
2042 };
2043 static struct procunit_value_info clock_source_xu_info[] = {
2044         { USB_XU_CLOCK_SOURCE_SELECTOR, "External", USB_MIXER_BOOLEAN },
2045         { 0 }
2046 };
2047 static struct procunit_value_info spdif_format_xu_info[] = {
2048         { USB_XU_DIGITAL_FORMAT_SELECTOR, "SPDIF/AC3", USB_MIXER_BOOLEAN },
2049         { 0 }
2050 };
2051 static struct procunit_value_info soft_limit_xu_info[] = {
2052         { USB_XU_SOFT_LIMIT_SELECTOR, " ", USB_MIXER_BOOLEAN },
2053         { 0 }
2054 };
2055 static struct procunit_info extunits[] = {
2056         { USB_XU_CLOCK_RATE, "Clock rate", clock_rate_xu_info },
2057         { USB_XU_CLOCK_SOURCE, "DigitalIn CLK source", clock_source_xu_info },
2058         { USB_XU_DIGITAL_IO_STATUS, "DigitalOut format:", spdif_format_xu_info },
2059         { USB_XU_DEVICE_OPTIONS, "AnalogueIn Soft Limit", soft_limit_xu_info },
2060         { 0 }
2061 };
2062
2063 /*
2064  * build a processing/extension unit
2065  */
2066 static int build_audio_procunit(struct mixer_build *state, int unitid,
2067                                 void *raw_desc, struct procunit_info *list,
2068                                 char *name)
2069 {
2070         struct uac_processing_unit_descriptor *desc = raw_desc;
2071         int num_ins = desc->bNrInPins;
2072         struct usb_mixer_elem_info *cval;
2073         struct snd_kcontrol *kctl;
2074         int i, err, nameid, type, len;
2075         struct procunit_info *info;
2076         struct procunit_value_info *valinfo;
2077         const struct usbmix_name_map *map;
2078         static struct procunit_value_info default_value_info[] = {
2079                 { 0x01, "Switch", USB_MIXER_BOOLEAN },
2080                 { 0 }
2081         };
2082         static struct procunit_info default_info = {
2083                 0, NULL, default_value_info
2084         };
2085
2086         if (desc->bLength < 13 || desc->bLength < 13 + num_ins ||
2087             desc->bLength < num_ins + uac_processing_unit_bControlSize(desc, state->mixer->protocol)) {
2088                 usb_audio_err(state->chip, "invalid %s descriptor (id %d)\n", name, unitid);
2089                 return -EINVAL;
2090         }
2091
2092         for (i = 0; i < num_ins; i++) {
2093                 if ((err = parse_audio_unit(state, desc->baSourceID[i])) < 0)
2094                         return err;
2095         }
2096
2097         type = le16_to_cpu(desc->wProcessType);
2098         for (info = list; info && info->type; info++)
2099                 if (info->type == type)
2100                         break;
2101         if (!info || !info->type)
2102                 info = &default_info;
2103
2104         for (valinfo = info->values; valinfo->control; valinfo++) {
2105                 __u8 *controls = uac_processing_unit_bmControls(desc, state->mixer->protocol);
2106
2107                 if (!(controls[valinfo->control / 8] & (1 << ((valinfo->control % 8) - 1))))
2108                         continue;
2109                 map = find_map(state, unitid, valinfo->control);
2110                 if (check_ignored_ctl(map))
2111                         continue;
2112                 cval = kzalloc(sizeof(*cval), GFP_KERNEL);
2113                 if (!cval)
2114                         return -ENOMEM;
2115                 snd_usb_mixer_elem_init_std(&cval->head, state->mixer, unitid);
2116                 cval->control = valinfo->control;
2117                 cval->val_type = valinfo->val_type;
2118                 cval->channels = 1;
2119
2120                 /* get min/max values */
2121                 if (type == UAC_PROCESS_UP_DOWNMIX && cval->control == UAC_UD_MODE_SELECT) {
2122                         __u8 *control_spec = uac_processing_unit_specific(desc, state->mixer->protocol);
2123                         /* FIXME: hard-coded */
2124                         cval->min = 1;
2125                         cval->max = control_spec[0];
2126                         cval->res = 1;
2127                         cval->initialized = 1;
2128                 } else {
2129                         if (type == USB_XU_CLOCK_RATE) {
2130                                 /*
2131                                  * E-Mu USB 0404/0202/TrackerPre/0204
2132                                  * samplerate control quirk
2133                                  */
2134                                 cval->min = 0;
2135                                 cval->max = 5;
2136                                 cval->res = 1;
2137                                 cval->initialized = 1;
2138                         } else
2139                                 get_min_max(cval, valinfo->min_value);
2140                 }
2141
2142                 kctl = snd_ctl_new1(&mixer_procunit_ctl, cval);
2143                 if (!kctl) {
2144                         kfree(cval);
2145                         return -ENOMEM;
2146                 }
2147                 kctl->private_free = snd_usb_mixer_elem_free;
2148
2149                 if (check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name))) {
2150                         /* nothing */ ;
2151                 } else if (info->name) {
2152                         strlcpy(kctl->id.name, info->name, sizeof(kctl->id.name));
2153                 } else {
2154                         nameid = uac_processing_unit_iProcessing(desc, state->mixer->protocol);
2155                         len = 0;
2156                         if (nameid)
2157                                 len = snd_usb_copy_string_desc(state, nameid,
2158                                                                kctl->id.name,
2159                                                                sizeof(kctl->id.name));
2160                         if (!len)
2161                                 strlcpy(kctl->id.name, name, sizeof(kctl->id.name));
2162                 }
2163                 append_ctl_name(kctl, " ");
2164                 append_ctl_name(kctl, valinfo->suffix);
2165
2166                 usb_audio_dbg(state->chip,
2167                               "[%d] PU [%s] ch = %d, val = %d/%d\n",
2168                               cval->head.id, kctl->id.name, cval->channels,
2169                               cval->min, cval->max);
2170
2171                 err = snd_usb_mixer_add_control(&cval->head, kctl);
2172                 if (err < 0)
2173                         return err;
2174         }
2175         return 0;
2176 }
2177
2178 static int parse_audio_processing_unit(struct mixer_build *state, int unitid,
2179                                        void *raw_desc)
2180 {
2181         return build_audio_procunit(state, unitid, raw_desc,
2182                                     procunits, "Processing Unit");
2183 }
2184
2185 static int parse_audio_extension_unit(struct mixer_build *state, int unitid,
2186                                       void *raw_desc)
2187 {
2188         /*
2189          * Note that we parse extension units with processing unit descriptors.
2190          * That's ok as the layout is the same.
2191          */
2192         return build_audio_procunit(state, unitid, raw_desc,
2193                                     extunits, "Extension Unit");
2194 }
2195
2196 /*
2197  * Selector Unit
2198  */
2199
2200 /*
2201  * info callback for selector unit
2202  * use an enumerator type for routing
2203  */
2204 static int mixer_ctl_selector_info(struct snd_kcontrol *kcontrol,
2205                                    struct snd_ctl_elem_info *uinfo)
2206 {
2207         struct usb_mixer_elem_info *cval = kcontrol->private_data;
2208         const char **itemlist = (const char **)kcontrol->private_value;
2209
2210         if (snd_BUG_ON(!itemlist))
2211                 return -EINVAL;
2212         return snd_ctl_enum_info(uinfo, 1, cval->max, itemlist);
2213 }
2214
2215 /* get callback for selector unit */
2216 static int mixer_ctl_selector_get(struct snd_kcontrol *kcontrol,
2217                                   struct snd_ctl_elem_value *ucontrol)
2218 {
2219         struct usb_mixer_elem_info *cval = kcontrol->private_data;
2220         int val, err;
2221
2222         err = get_cur_ctl_value(cval, cval->control << 8, &val);
2223         if (err < 0) {
2224                 ucontrol->value.enumerated.item[0] = 0;
2225                 return filter_error(cval, err);
2226         }
2227         val = get_relative_value(cval, val);
2228         ucontrol->value.enumerated.item[0] = val;
2229         return 0;
2230 }
2231
2232 /* put callback for selector unit */
2233 static int mixer_ctl_selector_put(struct snd_kcontrol *kcontrol,
2234                                   struct snd_ctl_elem_value *ucontrol)
2235 {
2236         struct usb_mixer_elem_info *cval = kcontrol->private_data;
2237         int val, oval, err;
2238
2239         err = get_cur_ctl_value(cval, cval->control << 8, &oval);
2240         if (err < 0)
2241                 return filter_error(cval, err);
2242         val = ucontrol->value.enumerated.item[0];
2243         val = get_abs_value(cval, val);
2244         if (val != oval) {
2245                 set_cur_ctl_value(cval, cval->control << 8, val);
2246                 return 1;
2247         }
2248         return 0;
2249 }
2250
2251 /* alsa control interface for selector unit */
2252 static const struct snd_kcontrol_new mixer_selectunit_ctl = {
2253         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
2254         .name = "", /* will be filled later */
2255         .info = mixer_ctl_selector_info,
2256         .get = mixer_ctl_selector_get,
2257         .put = mixer_ctl_selector_put,
2258 };
2259
2260 /*
2261  * private free callback.
2262  * free both private_data and private_value
2263  */
2264 static void usb_mixer_selector_elem_free(struct snd_kcontrol *kctl)
2265 {
2266         int i, num_ins = 0;
2267
2268         if (kctl->private_data) {
2269                 struct usb_mixer_elem_info *cval = kctl->private_data;
2270                 num_ins = cval->max;
2271                 kfree(cval);
2272                 kctl->private_data = NULL;
2273         }
2274         if (kctl->private_value) {
2275                 char **itemlist = (char **)kctl->private_value;
2276                 for (i = 0; i < num_ins; i++)
2277                         kfree(itemlist[i]);
2278                 kfree(itemlist);
2279                 kctl->private_value = 0;
2280         }
2281 }
2282
2283 /*
2284  * parse a selector unit
2285  */
2286 static int parse_audio_selector_unit(struct mixer_build *state, int unitid,
2287                                      void *raw_desc)
2288 {
2289         struct uac_selector_unit_descriptor *desc = raw_desc;
2290         unsigned int i, nameid, len;
2291         int err;
2292         struct usb_mixer_elem_info *cval;
2293         struct snd_kcontrol *kctl;
2294         const struct usbmix_name_map *map;
2295         char **namelist;
2296
2297         if (desc->bLength < 5 || !desc->bNrInPins ||
2298             desc->bLength < 5 + desc->bNrInPins) {
2299                 usb_audio_err(state->chip,
2300                         "invalid SELECTOR UNIT descriptor %d\n", unitid);
2301                 return -EINVAL;
2302         }
2303
2304         for (i = 0; i < desc->bNrInPins; i++) {
2305                 if ((err = parse_audio_unit(state, desc->baSourceID[i])) < 0)
2306                         return err;
2307         }
2308
2309         if (desc->bNrInPins == 1) /* only one ? nonsense! */
2310                 return 0;
2311
2312         map = find_map(state, unitid, 0);
2313         if (check_ignored_ctl(map))
2314                 return 0;
2315
2316         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
2317         if (!cval)
2318                 return -ENOMEM;
2319         snd_usb_mixer_elem_init_std(&cval->head, state->mixer, unitid);
2320         cval->val_type = USB_MIXER_U8;
2321         cval->channels = 1;
2322         cval->min = 1;
2323         cval->max = desc->bNrInPins;
2324         cval->res = 1;
2325         cval->initialized = 1;
2326
2327         if (state->mixer->protocol == UAC_VERSION_1)
2328                 cval->control = 0;
2329         else /* UAC_VERSION_2 */
2330                 cval->control = (desc->bDescriptorSubtype == UAC2_CLOCK_SELECTOR) ?
2331                         UAC2_CX_CLOCK_SELECTOR : UAC2_SU_SELECTOR;
2332
2333         namelist = kmalloc(sizeof(char *) * desc->bNrInPins, GFP_KERNEL);
2334         if (!namelist) {
2335                 kfree(cval);
2336                 return -ENOMEM;
2337         }
2338 #define MAX_ITEM_NAME_LEN       64
2339         for (i = 0; i < desc->bNrInPins; i++) {
2340                 struct usb_audio_term iterm;
2341                 len = 0;
2342                 namelist[i] = kmalloc(MAX_ITEM_NAME_LEN, GFP_KERNEL);
2343                 if (!namelist[i]) {
2344                         while (i--)
2345                                 kfree(namelist[i]);
2346                         kfree(namelist);
2347                         kfree(cval);
2348                         return -ENOMEM;
2349                 }
2350                 len = check_mapped_selector_name(state, unitid, i, namelist[i],
2351                                                  MAX_ITEM_NAME_LEN);
2352                 if (! len && check_input_term(state, desc->baSourceID[i], &iterm) >= 0)
2353                         len = get_term_name(state, &iterm, namelist[i], MAX_ITEM_NAME_LEN, 0);
2354                 if (! len)
2355                         sprintf(namelist[i], "Input %u", i);
2356         }
2357
2358         kctl = snd_ctl_new1(&mixer_selectunit_ctl, cval);
2359         if (! kctl) {
2360                 usb_audio_err(state->chip, "cannot malloc kcontrol\n");
2361                 kfree(namelist);
2362                 kfree(cval);
2363                 return -ENOMEM;
2364         }
2365         kctl->private_value = (unsigned long)namelist;
2366         kctl->private_free = usb_mixer_selector_elem_free;
2367
2368         /* check the static mapping table at first */
2369         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
2370         if (!len) {
2371                 /* no mapping ? */
2372                 /* if iSelector is given, use it */
2373                 nameid = uac_selector_unit_iSelector(desc);
2374                 if (nameid)
2375                         len = snd_usb_copy_string_desc(state, nameid,
2376                                                        kctl->id.name,
2377                                                        sizeof(kctl->id.name));
2378                 /* ... or pick up the terminal name at next */
2379                 if (!len)
2380                         len = get_term_name(state, &state->oterm,
2381                                     kctl->id.name, sizeof(kctl->id.name), 0);
2382                 /* ... or use the fixed string "USB" as the last resort */
2383                 if (!len)
2384                         strlcpy(kctl->id.name, "USB", sizeof(kctl->id.name));
2385
2386                 /* and add the proper suffix */
2387                 if (desc->bDescriptorSubtype == UAC2_CLOCK_SELECTOR)
2388                         append_ctl_name(kctl, " Clock Source");
2389                 else if ((state->oterm.type & 0xff00) == 0x0100)
2390                         append_ctl_name(kctl, " Capture Source");
2391                 else
2392                         append_ctl_name(kctl, " Playback Source");
2393         }
2394
2395         usb_audio_dbg(state->chip, "[%d] SU [%s] items = %d\n",
2396                     cval->head.id, kctl->id.name, desc->bNrInPins);
2397         return snd_usb_mixer_add_control(&cval->head, kctl);
2398 }
2399
2400 /*
2401  * parse an audio unit recursively
2402  */
2403
2404 static int parse_audio_unit(struct mixer_build *state, int unitid)
2405 {
2406         unsigned char *p1;
2407         int protocol = state->mixer->protocol;
2408
2409         if (test_and_set_bit(unitid, state->unitbitmap))
2410                 return 0; /* the unit already visited */
2411
2412         p1 = find_audio_control_unit(state, unitid);
2413         if (!p1) {
2414                 usb_audio_err(state->chip, "unit %d not found!\n", unitid);
2415                 return -EINVAL;
2416         }
2417
2418         if (protocol == UAC_VERSION_1 || protocol == UAC_VERSION_2) {
2419                 switch (p1[2]) {
2420                 case UAC_INPUT_TERMINAL:
2421                         return parse_audio_input_terminal(state, unitid, p1);
2422                 case UAC_MIXER_UNIT:
2423                         return parse_audio_mixer_unit(state, unitid, p1);
2424                 case UAC2_CLOCK_SOURCE:
2425                         return parse_clock_source_unit(state, unitid, p1);
2426                 case UAC_SELECTOR_UNIT:
2427                 case UAC2_CLOCK_SELECTOR:
2428                         return parse_audio_selector_unit(state, unitid, p1);
2429                 case UAC_FEATURE_UNIT:
2430                         return parse_audio_feature_unit(state, unitid, p1);
2431                 case UAC1_PROCESSING_UNIT:
2432                 /*   UAC2_EFFECT_UNIT has the same value */
2433                         if (protocol == UAC_VERSION_1)
2434                                 return parse_audio_processing_unit(state, unitid, p1);
2435                         else
2436                                 return 0; /* FIXME - effect units not implemented yet */
2437                 case UAC1_EXTENSION_UNIT:
2438                 /*   UAC2_PROCESSING_UNIT_V2 has the same value */
2439                         if (protocol == UAC_VERSION_1)
2440                                 return parse_audio_extension_unit(state, unitid, p1);
2441                         else /* UAC_VERSION_2 */
2442                                 return parse_audio_processing_unit(state, unitid, p1);
2443                 case UAC2_EXTENSION_UNIT_V2:
2444                         return parse_audio_extension_unit(state, unitid, p1);
2445                 default:
2446                         usb_audio_err(state->chip,
2447                                 "unit %u: unexpected type 0x%02x\n", unitid, p1[2]);
2448                         return -EINVAL;
2449                 }
2450         } else { /* UAC_VERSION_3 */
2451                 switch (p1[2]) {
2452                 case UAC_INPUT_TERMINAL:
2453                         return 0; /* NOP */
2454                 case UAC3_MIXER_UNIT:
2455                         return parse_audio_mixer_unit(state, unitid, p1);
2456                 case UAC3_CLOCK_SOURCE:
2457                         return parse_clock_source_unit(state, unitid, p1);
2458                 case UAC3_CLOCK_SELECTOR:
2459                         return parse_audio_selector_unit(state, unitid, p1);
2460                 case UAC3_FEATURE_UNIT:
2461                         return parse_audio_feature_unit(state, unitid, p1);
2462                 case UAC3_EFFECT_UNIT:
2463                         return 0; /* FIXME - effect units not implemented yet */
2464                 case UAC3_PROCESSING_UNIT:
2465                         return parse_audio_processing_unit(state, unitid, p1);
2466                 case UAC3_EXTENSION_UNIT:
2467                         return parse_audio_extension_unit(state, unitid, p1);
2468                 default:
2469                         usb_audio_err(state->chip,
2470                                 "unit %u: unexpected type 0x%02x\n", unitid, p1[2]);
2471                         return -EINVAL;
2472                 }
2473         }
2474 }
2475
2476 static void snd_usb_mixer_free(struct usb_mixer_interface *mixer)
2477 {
2478         /* kill pending URBs */
2479         snd_usb_mixer_disconnect(mixer);
2480
2481         kfree(mixer->id_elems);
2482         if (mixer->urb) {
2483                 kfree(mixer->urb->transfer_buffer);
2484                 usb_free_urb(mixer->urb);
2485         }
2486         usb_free_urb(mixer->rc_urb);
2487         kfree(mixer->rc_setup_packet);
2488         kfree(mixer);
2489 }
2490
2491 static int snd_usb_mixer_dev_free(struct snd_device *device)
2492 {
2493         struct usb_mixer_interface *mixer = device->device_data;
2494         snd_usb_mixer_free(mixer);
2495         return 0;
2496 }
2497
2498 /*
2499  * create mixer controls
2500  *
2501  * walk through all UAC_OUTPUT_TERMINAL descriptors to search for mixers
2502  */
2503 static int snd_usb_mixer_controls(struct usb_mixer_interface *mixer)
2504 {
2505         struct mixer_build state;
2506         int err;
2507         const struct usbmix_ctl_map *map;
2508         void *p;
2509
2510         memset(&state, 0, sizeof(state));
2511         state.chip = mixer->chip;
2512         state.mixer = mixer;
2513         state.buffer = mixer->hostif->extra;
2514         state.buflen = mixer->hostif->extralen;
2515
2516         /* check the mapping table */
2517         for (map = usbmix_ctl_maps; map->id; map++) {
2518                 if (map->id == state.chip->usb_id) {
2519                         state.map = map->map;
2520                         state.selector_map = map->selector_map;
2521                         mixer->ignore_ctl_error = map->ignore_ctl_error;
2522                         break;
2523                 }
2524         }
2525
2526         p = NULL;
2527         while ((p = snd_usb_find_csint_desc(mixer->hostif->extra,
2528                                             mixer->hostif->extralen,
2529                                             p, UAC_OUTPUT_TERMINAL)) != NULL) {
2530                 if (mixer->protocol == UAC_VERSION_1) {
2531                         struct uac1_output_terminal_descriptor *desc = p;
2532
2533                         if (desc->bLength < sizeof(*desc))
2534                                 continue; /* invalid descriptor? */
2535                         /* mark terminal ID as visited */
2536                         set_bit(desc->bTerminalID, state.unitbitmap);
2537                         state.oterm.id = desc->bTerminalID;
2538                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
2539                         state.oterm.name = desc->iTerminal;
2540                         err = parse_audio_unit(&state, desc->bSourceID);
2541                         if (err < 0 && err != -EINVAL)
2542                                 return err;
2543                 } else if (mixer->protocol == UAC_VERSION_2) {
2544                         struct uac2_output_terminal_descriptor *desc = p;
2545
2546                         if (desc->bLength < sizeof(*desc))
2547                                 continue; /* invalid descriptor? */
2548                         /* mark terminal ID as visited */
2549                         set_bit(desc->bTerminalID, state.unitbitmap);
2550                         state.oterm.id = desc->bTerminalID;
2551                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
2552                         state.oterm.name = desc->iTerminal;
2553                         err = parse_audio_unit(&state, desc->bSourceID);
2554                         if (err < 0 && err != -EINVAL)
2555                                 return err;
2556
2557                         /*
2558                          * For UAC2, use the same approach to also add the
2559                          * clock selectors
2560                          */
2561                         err = parse_audio_unit(&state, desc->bCSourceID);
2562                         if (err < 0 && err != -EINVAL)
2563                                 return err;
2564
2565                         if (uac_v2v3_control_is_readable(le16_to_cpu(desc->bmControls),
2566                                                          UAC2_TE_CONNECTOR)) {
2567                                 build_connector_control(&state, &state.oterm,
2568                                                         false);
2569                         }
2570                 } else {  /* UAC_VERSION_3 */
2571                         struct uac3_output_terminal_descriptor *desc = p;
2572
2573                         if (desc->bLength < sizeof(*desc))
2574                                 continue; /* invalid descriptor? */
2575                         /* mark terminal ID as visited */
2576                         set_bit(desc->bTerminalID, state.unitbitmap);
2577                         state.oterm.id = desc->bTerminalID;
2578                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
2579                         state.oterm.name = le16_to_cpu(desc->wTerminalDescrStr);
2580                         err = parse_audio_unit(&state, desc->bSourceID);
2581                         if (err < 0 && err != -EINVAL)
2582                                 return err;
2583
2584                         /*
2585                          * For UAC3, use the same approach to also add the
2586                          * clock selectors
2587                          */
2588                         err = parse_audio_unit(&state, desc->bCSourceID);
2589                         if (err < 0 && err != -EINVAL)
2590                                 return err;
2591                 }
2592         }
2593
2594         return 0;
2595 }
2596
2597 void snd_usb_mixer_notify_id(struct usb_mixer_interface *mixer, int unitid)
2598 {
2599         struct usb_mixer_elem_list *list;
2600
2601         for (list = mixer->id_elems[unitid]; list; list = list->next_id_elem) {
2602                 struct usb_mixer_elem_info *info =
2603                         (struct usb_mixer_elem_info *)list;
2604                 /* invalidate cache, so the value is read from the device */
2605                 info->cached = 0;
2606                 snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
2607                                &list->kctl->id);
2608         }
2609 }
2610
2611 static void snd_usb_mixer_dump_cval(struct snd_info_buffer *buffer,
2612                                     struct usb_mixer_elem_list *list)
2613 {
2614         struct usb_mixer_elem_info *cval = (struct usb_mixer_elem_info *)list;
2615         static char *val_types[] = {"BOOLEAN", "INV_BOOLEAN",
2616                                     "S8", "U8", "S16", "U16"};
2617         snd_iprintf(buffer, "    Info: id=%i, control=%i, cmask=0x%x, "
2618                             "channels=%i, type=\"%s\"\n", cval->head.id,
2619                             cval->control, cval->cmask, cval->channels,
2620                             val_types[cval->val_type]);
2621         snd_iprintf(buffer, "    Volume: min=%i, max=%i, dBmin=%i, dBmax=%i\n",
2622                             cval->min, cval->max, cval->dBmin, cval->dBmax);
2623 }
2624
2625 static void snd_usb_mixer_proc_read(struct snd_info_entry *entry,
2626                                     struct snd_info_buffer *buffer)
2627 {
2628         struct snd_usb_audio *chip = entry->private_data;
2629         struct usb_mixer_interface *mixer;
2630         struct usb_mixer_elem_list *list;
2631         int unitid;
2632
2633         list_for_each_entry(mixer, &chip->mixer_list, list) {
2634                 snd_iprintf(buffer,
2635                         "USB Mixer: usb_id=0x%08x, ctrlif=%i, ctlerr=%i\n",
2636                                 chip->usb_id, snd_usb_ctrl_intf(chip),
2637                                 mixer->ignore_ctl_error);
2638                 snd_iprintf(buffer, "Card: %s\n", chip->card->longname);
2639                 for (unitid = 0; unitid < MAX_ID_ELEMS; unitid++) {
2640                         for (list = mixer->id_elems[unitid]; list;
2641                              list = list->next_id_elem) {
2642                                 snd_iprintf(buffer, "  Unit: %i\n", list->id);
2643                                 if (list->kctl)
2644                                         snd_iprintf(buffer,
2645                                                     "    Control: name=\"%s\", index=%i\n",
2646                                                     list->kctl->id.name,
2647                                                     list->kctl->id.index);
2648                                 if (list->dump)
2649                                         list->dump(buffer, list);
2650                         }
2651                 }
2652         }
2653 }
2654
2655 static void snd_usb_mixer_interrupt_v2(struct usb_mixer_interface *mixer,
2656                                        int attribute, int value, int index)
2657 {
2658         struct usb_mixer_elem_list *list;
2659         __u8 unitid = (index >> 8) & 0xff;
2660         __u8 control = (value >> 8) & 0xff;
2661         __u8 channel = value & 0xff;
2662         unsigned int count = 0;
2663
2664         if (channel >= MAX_CHANNELS) {
2665                 usb_audio_dbg(mixer->chip,
2666                         "%s(): bogus channel number %d\n",
2667                         __func__, channel);
2668                 return;
2669         }
2670
2671         for (list = mixer->id_elems[unitid]; list; list = list->next_id_elem)
2672                 count++;
2673
2674         if (count == 0)
2675                 return;
2676
2677         for (list = mixer->id_elems[unitid]; list; list = list->next_id_elem) {
2678                 struct usb_mixer_elem_info *info;
2679
2680                 if (!list->kctl)
2681                         continue;
2682
2683                 info = (struct usb_mixer_elem_info *)list;
2684                 if (count > 1 && info->control != control)
2685                         continue;
2686
2687                 switch (attribute) {
2688                 case UAC2_CS_CUR:
2689                         /* invalidate cache, so the value is read from the device */
2690                         if (channel)
2691                                 info->cached &= ~(1 << channel);
2692                         else /* master channel */
2693                                 info->cached = 0;
2694
2695                         snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
2696                                        &info->head.kctl->id);
2697                         break;
2698
2699                 case UAC2_CS_RANGE:
2700                         /* TODO */
2701                         break;
2702
2703                 case UAC2_CS_MEM:
2704                         /* TODO */
2705                         break;
2706
2707                 default:
2708                         usb_audio_dbg(mixer->chip,
2709                                 "unknown attribute %d in interrupt\n",
2710                                 attribute);
2711                         break;
2712                 } /* switch */
2713         }
2714 }
2715
2716 static void snd_usb_mixer_interrupt(struct urb *urb)
2717 {
2718         struct usb_mixer_interface *mixer = urb->context;
2719         int len = urb->actual_length;
2720         int ustatus = urb->status;
2721
2722         if (ustatus != 0)
2723                 goto requeue;
2724
2725         if (mixer->protocol == UAC_VERSION_1) {
2726                 struct uac1_status_word *status;
2727
2728                 for (status = urb->transfer_buffer;
2729                      len >= sizeof(*status);
2730                      len -= sizeof(*status), status++) {
2731                         dev_dbg(&urb->dev->dev, "status interrupt: %02x %02x\n",
2732                                                 status->bStatusType,
2733                                                 status->bOriginator);
2734
2735                         /* ignore any notifications not from the control interface */
2736                         if ((status->bStatusType & UAC1_STATUS_TYPE_ORIG_MASK) !=
2737                                 UAC1_STATUS_TYPE_ORIG_AUDIO_CONTROL_IF)
2738                                 continue;
2739
2740                         if (status->bStatusType & UAC1_STATUS_TYPE_MEM_CHANGED)
2741                                 snd_usb_mixer_rc_memory_change(mixer, status->bOriginator);
2742                         else
2743                                 snd_usb_mixer_notify_id(mixer, status->bOriginator);
2744                 }
2745         } else { /* UAC_VERSION_2 */
2746                 struct uac2_interrupt_data_msg *msg;
2747
2748                 for (msg = urb->transfer_buffer;
2749                      len >= sizeof(*msg);
2750                      len -= sizeof(*msg), msg++) {
2751                         /* drop vendor specific and endpoint requests */
2752                         if ((msg->bInfo & UAC2_INTERRUPT_DATA_MSG_VENDOR) ||
2753                             (msg->bInfo & UAC2_INTERRUPT_DATA_MSG_EP))
2754                                 continue;
2755
2756                         snd_usb_mixer_interrupt_v2(mixer, msg->bAttribute,
2757                                                    le16_to_cpu(msg->wValue),
2758                                                    le16_to_cpu(msg->wIndex));
2759                 }
2760         }
2761
2762 requeue:
2763         if (ustatus != -ENOENT &&
2764             ustatus != -ECONNRESET &&
2765             ustatus != -ESHUTDOWN) {
2766                 urb->dev = mixer->chip->dev;
2767                 usb_submit_urb(urb, GFP_ATOMIC);
2768         }
2769 }
2770
2771 /* create the handler for the optional status interrupt endpoint */
2772 static int snd_usb_mixer_status_create(struct usb_mixer_interface *mixer)
2773 {
2774         struct usb_endpoint_descriptor *ep;
2775         void *transfer_buffer;
2776         int buffer_length;
2777         unsigned int epnum;
2778
2779         /* we need one interrupt input endpoint */
2780         if (get_iface_desc(mixer->hostif)->bNumEndpoints < 1)
2781                 return 0;
2782         ep = get_endpoint(mixer->hostif, 0);
2783         if (!usb_endpoint_dir_in(ep) || !usb_endpoint_xfer_int(ep))
2784                 return 0;
2785
2786         epnum = usb_endpoint_num(ep);
2787         buffer_length = le16_to_cpu(ep->wMaxPacketSize);
2788         transfer_buffer = kmalloc(buffer_length, GFP_KERNEL);
2789         if (!transfer_buffer)
2790                 return -ENOMEM;
2791         mixer->urb = usb_alloc_urb(0, GFP_KERNEL);
2792         if (!mixer->urb) {
2793                 kfree(transfer_buffer);
2794                 return -ENOMEM;
2795         }
2796         usb_fill_int_urb(mixer->urb, mixer->chip->dev,
2797                          usb_rcvintpipe(mixer->chip->dev, epnum),
2798                          transfer_buffer, buffer_length,
2799                          snd_usb_mixer_interrupt, mixer, ep->bInterval);
2800         usb_submit_urb(mixer->urb, GFP_KERNEL);
2801         return 0;
2802 }
2803
2804 int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif,
2805                          int ignore_error)
2806 {
2807         static struct snd_device_ops dev_ops = {
2808                 .dev_free = snd_usb_mixer_dev_free
2809         };
2810         struct usb_mixer_interface *mixer;
2811         struct snd_info_entry *entry;
2812         int err;
2813
2814         strcpy(chip->card->mixername, "USB Mixer");
2815
2816         mixer = kzalloc(sizeof(*mixer), GFP_KERNEL);
2817         if (!mixer)
2818                 return -ENOMEM;
2819         mixer->chip = chip;
2820         mixer->ignore_ctl_error = ignore_error;
2821         mixer->id_elems = kcalloc(MAX_ID_ELEMS, sizeof(*mixer->id_elems),
2822                                   GFP_KERNEL);
2823         if (!mixer->id_elems) {
2824                 kfree(mixer);
2825                 return -ENOMEM;
2826         }
2827
2828         mixer->hostif = &usb_ifnum_to_if(chip->dev, ctrlif)->altsetting[0];
2829         switch (get_iface_desc(mixer->hostif)->bInterfaceProtocol) {
2830         case UAC_VERSION_1:
2831         default:
2832                 mixer->protocol = UAC_VERSION_1;
2833                 break;
2834         case UAC_VERSION_2:
2835                 mixer->protocol = UAC_VERSION_2;
2836                 break;
2837         case UAC_VERSION_3:
2838                 mixer->protocol = UAC_VERSION_3;
2839                 break;
2840         }
2841
2842         if ((err = snd_usb_mixer_controls(mixer)) < 0 ||
2843             (err = snd_usb_mixer_status_create(mixer)) < 0)
2844                 goto _error;
2845
2846         snd_usb_mixer_apply_create_quirk(mixer);
2847
2848         err = snd_device_new(chip->card, SNDRV_DEV_CODEC, mixer, &dev_ops);
2849         if (err < 0)
2850                 goto _error;
2851
2852         if (list_empty(&chip->mixer_list) &&
2853             !snd_card_proc_new(chip->card, "usbmixer", &entry))
2854                 snd_info_set_text_ops(entry, chip, snd_usb_mixer_proc_read);
2855
2856         list_add(&mixer->list, &chip->mixer_list);
2857         return 0;
2858
2859 _error:
2860         snd_usb_mixer_free(mixer);
2861         return err;
2862 }
2863
2864 void snd_usb_mixer_disconnect(struct usb_mixer_interface *mixer)
2865 {
2866         if (mixer->disconnected)
2867                 return;
2868         if (mixer->urb)
2869                 usb_kill_urb(mixer->urb);
2870         if (mixer->rc_urb)
2871                 usb_kill_urb(mixer->rc_urb);
2872         mixer->disconnected = true;
2873 }
2874
2875 #ifdef CONFIG_PM
2876 /* stop any bus activity of a mixer */
2877 static void snd_usb_mixer_inactivate(struct usb_mixer_interface *mixer)
2878 {
2879         usb_kill_urb(mixer->urb);
2880         usb_kill_urb(mixer->rc_urb);
2881 }
2882
2883 static int snd_usb_mixer_activate(struct usb_mixer_interface *mixer)
2884 {
2885         int err;
2886
2887         if (mixer->urb) {
2888                 err = usb_submit_urb(mixer->urb, GFP_NOIO);
2889                 if (err < 0)
2890                         return err;
2891         }
2892
2893         return 0;
2894 }
2895
2896 int snd_usb_mixer_suspend(struct usb_mixer_interface *mixer)
2897 {
2898         snd_usb_mixer_inactivate(mixer);
2899         return 0;
2900 }
2901
2902 static int restore_mixer_value(struct usb_mixer_elem_list *list)
2903 {
2904         struct usb_mixer_elem_info *cval = (struct usb_mixer_elem_info *)list;
2905         int c, err, idx;
2906
2907         if (cval->cmask) {
2908                 idx = 0;
2909                 for (c = 0; c < MAX_CHANNELS; c++) {
2910                         if (!(cval->cmask & (1 << c)))
2911                                 continue;
2912                         if (cval->cached & (1 << (c + 1))) {
2913                                 err = snd_usb_set_cur_mix_value(cval, c + 1, idx,
2914                                                         cval->cache_val[idx]);
2915                                 if (err < 0)
2916                                         return err;
2917                         }
2918                         idx++;
2919                 }
2920         } else {
2921                 /* master */
2922                 if (cval->cached) {
2923                         err = snd_usb_set_cur_mix_value(cval, 0, 0, *cval->cache_val);
2924                         if (err < 0)
2925                                 return err;
2926                 }
2927         }
2928
2929         return 0;
2930 }
2931
2932 int snd_usb_mixer_resume(struct usb_mixer_interface *mixer, bool reset_resume)
2933 {
2934         struct usb_mixer_elem_list *list;
2935         int id, err;
2936
2937         if (reset_resume) {
2938                 /* restore cached mixer values */
2939                 for (id = 0; id < MAX_ID_ELEMS; id++) {
2940                         for (list = mixer->id_elems[id]; list;
2941                              list = list->next_id_elem) {
2942                                 if (list->resume) {
2943                                         err = list->resume(list);
2944                                         if (err < 0)
2945                                                 return err;
2946                                 }
2947                         }
2948                 }
2949         }
2950
2951         return snd_usb_mixer_activate(mixer);
2952 }
2953 #endif
2954
2955 void snd_usb_mixer_elem_init_std(struct usb_mixer_elem_list *list,
2956                                  struct usb_mixer_interface *mixer,
2957                                  int unitid)
2958 {
2959         list->mixer = mixer;
2960         list->id = unitid;
2961         list->dump = snd_usb_mixer_dump_cval;
2962 #ifdef CONFIG_PM
2963         list->resume = restore_mixer_value;
2964 #endif
2965 }