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 <tiwai@suse.de>
   7  *
   8  *   Many codes borrowed from audio.c by
   9  *          Alan Cox (alan@lxorguk.ukuu.org.uk)
  10  *          Thomas Sailer (sailer@ife.ee.ethz.ch)
  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/slab.h>
  49 #include <linux/string.h>
  50 #include <linux/usb.h>
  51 #include <linux/usb/audio.h>
  52 #include <linux/usb/audio-v2.h>
  53
  54 #include <sound/core.h>
  55 #include <sound/control.h>
  56 #include <sound/hwdep.h>
  57 #include <sound/info.h>
  58 #include <sound/tlv.h>
  59
  60 #include "usbaudio.h"
  61 #include "mixer.h"
  62 #include "helper.h"
  63 #include "mixer_quirks.h"
  64 #include "power.h"
  65
  66 #define MAX_ID_ELEMS    256
  67
  68 struct usb_audio_term {
  69         int id;
  70         int type;
  71         int channels;
  72         unsigned int chconfig;
  73         int name;
  74 };
  75
  76 struct usbmix_name_map;
  77
  78 struct mixer_build {
  79         struct snd_usb_audio *chip;
  80         struct usb_mixer_interface *mixer;
  81         unsigned char *buffer;
  82         unsigned int buflen;
  83         DECLARE_BITMAP(unitbitmap, MAX_ID_ELEMS);
  84         struct usb_audio_term oterm;
  85         const struct usbmix_name_map *map;
  86         const struct usbmix_selector_map *selector_map;
  87 };
  88
  89 /*E-mu 0202/0404/0204 eXtension Unit(XU) control*/
  90 enum {
  91         USB_XU_CLOCK_RATE               = 0xe301,
  92         USB_XU_CLOCK_SOURCE             = 0xe302,
  93         USB_XU_DIGITAL_IO_STATUS        = 0xe303,
  94         USB_XU_DEVICE_OPTIONS           = 0xe304,
  95         USB_XU_DIRECT_MONITORING        = 0xe305,
  96         USB_XU_METERING                 = 0xe306
  97 };
  98 enum {
  99         USB_XU_CLOCK_SOURCE_SELECTOR = 0x02,    /* clock source*/
 100         USB_XU_CLOCK_RATE_SELECTOR = 0x03,      /* clock rate */
 101         USB_XU_DIGITAL_FORMAT_SELECTOR = 0x01,  /* the spdif format */
 102         USB_XU_SOFT_LIMIT_SELECTOR = 0x03       /* soft limiter */
 103 };
 104
 105 /*
 106  * manual mapping of mixer names
 107  * if the mixer topology is too complicated and the parsed names are
 108  * ambiguous, add the entries in usbmixer_maps.c.
 109  */
 110 #include "mixer_maps.c"
 111
 112 static const struct usbmix_name_map *
 113 find_map(struct mixer_build *state, int unitid, int control)
 114 {
 115         const struct usbmix_name_map *p = state->map;
 116
 117         if (!p)
 118                 return NULL;
 119
 120         for (p = state->map; p->id; p++) {
 121                 if (p->id == unitid &&
 122                     (!control || !p->control || control == p->control))
 123                         return p;
 124         }
 125         return NULL;
 126 }
 127
 128 /* get the mapped name if the unit matches */
 129 static int
 130 check_mapped_name(const struct usbmix_name_map *p, char *buf, int buflen)
 131 {
 132         if (!p || !p->name)
 133                 return 0;
 134
 135         buflen--;
 136         return strlcpy(buf, p->name, buflen);
 137 }
 138
 139 /* check whether the control should be ignored */
 140 static inline int
 141 check_ignored_ctl(const struct usbmix_name_map *p)
 142 {
 143         if (!p || p->name || p->dB)
 144                 return 0;
 145         return 1;
 146 }
 147
 148 /* dB mapping */
 149 static inline void check_mapped_dB(const struct usbmix_name_map *p,
 150                                    struct usb_mixer_elem_info *cval)
 151 {
 152         if (p && p->dB) {
 153                 cval->dBmin = p->dB->min;
 154                 cval->dBmax = p->dB->max;
 155                 cval->initialized = 1;
 156         }
 157 }
 158
 159 /* get the mapped selector source name */
 160 static int check_mapped_selector_name(struct mixer_build *state, int unitid,
 161                                       int index, char *buf, int buflen)
 162 {
 163         const struct usbmix_selector_map *p;
 164
 165         if (! state->selector_map)
 166                 return 0;
 167         for (p = state->selector_map; p->id; p++) {
 168                 if (p->id == unitid && index < p->count)
 169                         return strlcpy(buf, p->names[index], buflen);
 170         }
 171         return 0;
 172 }
 173
 174 /*
 175  * find an audio control unit with the given unit id
 176  */
 177 static void *find_audio_control_unit(struct mixer_build *state, unsigned char unit)
 178 {
 179         /* we just parse the header */
 180         struct uac_feature_unit_descriptor *hdr = NULL;
 181
 182         while ((hdr = snd_usb_find_desc(state->buffer, state->buflen, hdr,
 183                                         USB_DT_CS_INTERFACE)) != NULL) {
 184                 if (hdr->bLength >= 4 &&
 185                     hdr->bDescriptorSubtype >= UAC_INPUT_TERMINAL &&
 186                     hdr->bDescriptorSubtype <= UAC2_SAMPLE_RATE_CONVERTER &&
 187                     hdr->bUnitID == unit)
 188                         return hdr;
 189         }
 190
 191         return NULL;
 192 }
 193
 194 /*
 195  * copy a string with the given id
 196  */
 197 static int snd_usb_copy_string_desc(struct mixer_build *state, int index, char *buf, int maxlen)
 198 {
 199         int len = usb_string(state->chip->dev, index, buf, maxlen - 1);
 200         buf[len] = 0;
 201         return len;
 202 }
 203
 204 /*
 205  * convert from the byte/word on usb descriptor to the zero-based integer
 206  */
 207 static int convert_signed_value(struct usb_mixer_elem_info *cval, int val)
 208 {
 209         switch (cval->val_type) {
 210         case USB_MIXER_BOOLEAN:
 211                 return !!val;
 212         case USB_MIXER_INV_BOOLEAN:
 213                 return !val;
 214         case USB_MIXER_U8:
 215                 val &= 0xff;
 216                 break;
 217         case USB_MIXER_S8:
 218                 val &= 0xff;
 219                 if (val >= 0x80)
 220                         val -= 0x100;
 221                 break;
 222         case USB_MIXER_U16:
 223                 val &= 0xffff;
 224                 break;
 225         case USB_MIXER_S16:
 226                 val &= 0xffff;
 227                 if (val >= 0x8000)
 228                         val -= 0x10000;
 229                 break;
 230         }
 231         return val;
 232 }
 233
 234 /*
 235  * convert from the zero-based int to the byte/word for usb descriptor
 236  */
 237 static int convert_bytes_value(struct usb_mixer_elem_info *cval, int val)
 238 {
 239         switch (cval->val_type) {
 240         case USB_MIXER_BOOLEAN:
 241                 return !!val;
 242         case USB_MIXER_INV_BOOLEAN:
 243                 return !val;
 244         case USB_MIXER_S8:
 245         case USB_MIXER_U8:
 246                 return val & 0xff;
 247         case USB_MIXER_S16:
 248         case USB_MIXER_U16:
 249                 return val & 0xffff;
 250         }
 251         return 0; /* not reached */
 252 }
 253
 254 static int get_relative_value(struct usb_mixer_elem_info *cval, int val)
 255 {
 256         if (! cval->res)
 257                 cval->res = 1;
 258         if (val < cval->min)
 259                 return 0;
 260         else if (val >= cval->max)
 261                 return (cval->max - cval->min + cval->res - 1) / cval->res;
 262         else
 263                 return (val - cval->min) / cval->res;
 264 }
 265
 266 static int get_abs_value(struct usb_mixer_elem_info *cval, int val)
 267 {
 268         if (val < 0)
 269                 return cval->min;
 270         if (! cval->res)
 271                 cval->res = 1;
 272         val *= cval->res;
 273         val += cval->min;
 274         if (val > cval->max)
 275                 return cval->max;
 276         return val;
 277 }
 278
 279
 280 /*
 281  * retrieve a mixer value
 282  */
 283
 284 static int get_ctl_value_v1(struct usb_mixer_elem_info *cval, int request, int validx, int *value_ret)
 285 {
 286         struct snd_usb_audio *chip = cval->mixer->chip;
 287         unsigned char buf[2];
 288         int val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
 289         int timeout = 10;
 290         int idx = 0, err;
 291
 292         err = snd_usb_autoresume(cval->mixer->chip);
 293         if (err < 0)
 294                 return -EIO;
 295         down_read(&chip->shutdown_rwsem);
 296         while (timeout-- > 0) {
 297                 if (chip->shutdown)
 298                         break;
 299                 idx = snd_usb_ctrl_intf(chip) | (cval->id << 8);
 300                 if (snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), request,
 301                                     USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
 302                                     validx, idx, buf, val_len) >= val_len) {
 303                         *value_ret = convert_signed_value(cval, snd_usb_combine_bytes(buf, val_len));
 304                         err = 0;
 305                         goto out;
 306                 }
 307         }
 308         snd_printdd(KERN_ERR "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
 309                     request, validx, idx, cval->val_type);
 310         err = -EINVAL;
 311
 312  out:
 313         up_read(&chip->shutdown_rwsem);
 314         snd_usb_autosuspend(cval->mixer->chip);
 315         return err;
 316 }
 317
 318 static int get_ctl_value_v2(struct usb_mixer_elem_info *cval, int request, int validx, int *value_ret)
 319 {
 320         struct snd_usb_audio *chip = cval->mixer->chip;
 321         unsigned char buf[2 + 3*sizeof(__u16)]; /* enough space for one range */
 322         unsigned char *val;
 323         int idx = 0, ret, size;
 324         __u8 bRequest;
 325
 326         if (request == UAC_GET_CUR) {
 327                 bRequest = UAC2_CS_CUR;
 328                 size = sizeof(__u16);
 329         } else {
 330                 bRequest = UAC2_CS_RANGE;
 331                 size = sizeof(buf);
 332         }
 333
 334         memset(buf, 0, sizeof(buf));
 335
 336         ret = snd_usb_autoresume(chip) ? -EIO : 0;
 337         if (ret)
 338                 goto error;
 339
 340         down_read(&chip->shutdown_rwsem);
 341         if (chip->shutdown)
 342                 ret = -ENODEV;
 343         else {
 344                 idx = snd_usb_ctrl_intf(chip) | (cval->id << 8);
 345                 ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), bRequest,
 346                               USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
 347                               validx, idx, buf, size);
 348         }
 349         up_read(&chip->shutdown_rwsem);
 350         snd_usb_autosuspend(chip);
 351
 352         if (ret < 0) {
 353 error:
 354                 snd_printk(KERN_ERR "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
 355                            request, validx, idx, cval->val_type);
 356                 return ret;
 357         }
 358
 359         /* FIXME: how should we handle multiple triplets here? */
 360
 361         switch (request) {
 362         case UAC_GET_CUR:
 363                 val = buf;
 364                 break;
 365         case UAC_GET_MIN:
 366                 val = buf + sizeof(__u16);
 367                 break;
 368         case UAC_GET_MAX:
 369                 val = buf + sizeof(__u16) * 2;
 370                 break;
 371         case UAC_GET_RES:
 372                 val = buf + sizeof(__u16) * 3;
 373                 break;
 374         default:
 375                 return -EINVAL;
 376         }
 377
 378         *value_ret = convert_signed_value(cval, snd_usb_combine_bytes(val, sizeof(__u16)));
 379
 380         return 0;
 381 }
 382
 383 static int get_ctl_value(struct usb_mixer_elem_info *cval, int request, int validx, int *value_ret)
 384 {
 385         validx += cval->idx_off;
 386
 387         return (cval->mixer->protocol == UAC_VERSION_1) ?
 388                 get_ctl_value_v1(cval, request, validx, value_ret) :
 389                 get_ctl_value_v2(cval, request, validx, value_ret);
 390 }
 391
 392 static int get_cur_ctl_value(struct usb_mixer_elem_info *cval, int validx, int *value)
 393 {
 394         return get_ctl_value(cval, UAC_GET_CUR, validx, value);
 395 }
 396
 397 /* channel = 0: master, 1 = first channel */
 398 static inline int get_cur_mix_raw(struct usb_mixer_elem_info *cval,
 399                                   int channel, int *value)
 400 {
 401         return get_ctl_value(cval, UAC_GET_CUR, (cval->control << 8) | channel, value);
 402 }
 403
 404 static int get_cur_mix_value(struct usb_mixer_elem_info *cval,
 405                              int channel, int index, int *value)
 406 {
 407         int err;
 408
 409         if (cval->cached & (1 << channel)) {
 410                 *value = cval->cache_val[index];
 411                 return 0;
 412         }
 413         err = get_cur_mix_raw(cval, channel, value);
 414         if (err < 0) {
 415                 if (!cval->mixer->ignore_ctl_error)
 416                         snd_printd(KERN_ERR "cannot get current value for control %d ch %d: err = %d\n",
 417                                    cval->control, channel, err);
 418                 return err;
 419         }
 420         cval->cached |= 1 << channel;
 421         cval->cache_val[index] = *value;
 422         return 0;
 423 }
 424
 425
 426 /*
 427  * set a mixer value
 428  */
 429
 430 int snd_usb_mixer_set_ctl_value(struct usb_mixer_elem_info *cval,
 431                                 int request, int validx, int value_set)
 432 {
 433         struct snd_usb_audio *chip = cval->mixer->chip;
 434         unsigned char buf[2];
 435         int idx = 0, val_len, err, timeout = 10;
 436
 437         validx += cval->idx_off;
 438
 439         if (cval->mixer->protocol == UAC_VERSION_1) {
 440                 val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
 441         } else { /* UAC_VERSION_2 */
 442                 /* audio class v2 controls are always 2 bytes in size */
 443                 val_len = sizeof(__u16);
 444
 445                 /* FIXME */
 446                 if (request != UAC_SET_CUR) {
 447                         snd_printdd(KERN_WARNING "RANGE setting not yet supported\n");
 448                         return -EINVAL;
 449                 }
 450
 451                 request = UAC2_CS_CUR;
 452         }
 453
 454         value_set = convert_bytes_value(cval, value_set);
 455         buf[0] = value_set & 0xff;
 456         buf[1] = (value_set >> 8) & 0xff;
 457         err = snd_usb_autoresume(chip);
 458         if (err < 0)
 459                 return -EIO;
 460         down_read(&chip->shutdown_rwsem);
 461         while (timeout-- > 0) {
 462                 if (chip->shutdown)
 463                         break;
 464                 idx = snd_usb_ctrl_intf(chip) | (cval->id << 8);
 465                 if (snd_usb_ctl_msg(chip->dev,
 466                                     usb_sndctrlpipe(chip->dev, 0), request,
 467                                     USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
 468                                     validx, idx, buf, val_len) >= 0) {
 469                         err = 0;
 470                         goto out;
 471                 }
 472         }
 473         snd_printdd(KERN_ERR "cannot set ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d, data = %#x/%#x\n",
 474                     request, validx, idx, cval->val_type, buf[0], buf[1]);
 475         err = -EINVAL;
 476
 477  out:
 478         up_read(&chip->shutdown_rwsem);
 479         snd_usb_autosuspend(chip);
 480         return err;
 481 }
 482
 483 static int set_cur_ctl_value(struct usb_mixer_elem_info *cval, int validx, int value)
 484 {
 485         return snd_usb_mixer_set_ctl_value(cval, UAC_SET_CUR, validx, value);
 486 }
 487
 488 static int set_cur_mix_value(struct usb_mixer_elem_info *cval, int channel,
 489                              int index, int value)
 490 {
 491         int err;
 492         unsigned int read_only = (channel == 0) ?
 493                 cval->master_readonly :
 494                 cval->ch_readonly & (1 << (channel - 1));
 495
 496         if (read_only) {
 497                 snd_printdd(KERN_INFO "%s(): channel %d of control %d is read_only\n",
 498                             __func__, channel, cval->control);
 499                 return 0;
 500         }
 501
 502         err = snd_usb_mixer_set_ctl_value(cval, UAC_SET_CUR, (cval->control << 8) | channel,
 503                             value);
 504         if (err < 0)
 505                 return err;
 506         cval->cached |= 1 << channel;
 507         cval->cache_val[index] = value;
 508         return 0;
 509 }
 510
 511 /*
 512  * TLV callback for mixer volume controls
 513  */
 514 int snd_usb_mixer_vol_tlv(struct snd_kcontrol *kcontrol, int op_flag,
 515                          unsigned int size, unsigned int __user *_tlv)
 516 {
 517         struct usb_mixer_elem_info *cval = kcontrol->private_data;
 518         DECLARE_TLV_DB_MINMAX(scale, 0, 0);
 519
 520         if (size < sizeof(scale))
 521                 return -ENOMEM;
 522         scale[2] = cval->dBmin;
 523         scale[3] = cval->dBmax;
 524         if (copy_to_user(_tlv, scale, sizeof(scale)))
 525                 return -EFAULT;
 526         return 0;
 527 }
 528
 529 /*
 530  * parser routines begin here...
 531  */
 532
 533 static int parse_audio_unit(struct mixer_build *state, int unitid);
 534
 535
 536 /*
 537  * check if the input/output channel routing is enabled on the given bitmap.
 538  * used for mixer unit parser
 539  */
 540 static int check_matrix_bitmap(unsigned char *bmap, int ich, int och, int num_outs)
 541 {
 542         int idx = ich * num_outs + och;
 543         return bmap[idx >> 3] & (0x80 >> (idx & 7));
 544 }
 545
 546
 547 /*
 548  * add an alsa control element
 549  * search and increment the index until an empty slot is found.
 550  *
 551  * if failed, give up and free the control instance.
 552  */
 553
 554 int snd_usb_mixer_add_control(struct usb_mixer_interface *mixer,
 555                               struct snd_kcontrol *kctl)
 556 {
 557         struct usb_mixer_elem_info *cval = kctl->private_data;
 558         int err;
 559
 560         while (snd_ctl_find_id(mixer->chip->card, &kctl->id))
 561                 kctl->id.index++;
 562         if ((err = snd_ctl_add(mixer->chip->card, kctl)) < 0) {
 563                 snd_printd(KERN_ERR "cannot add control (err = %d)\n", err);
 564                 return err;
 565         }
 566         cval->elem_id = &kctl->id;
 567         cval->next_id_elem = mixer->id_elems[cval->id];
 568         mixer->id_elems[cval->id] = cval;
 569         return 0;
 570 }
 571
 572
 573 /*
 574  * get a terminal name string
 575  */
 576
 577 static struct iterm_name_combo {
 578         int type;
 579         char *name;
 580 } iterm_names[] = {
 581         { 0x0300, "Output" },
 582         { 0x0301, "Speaker" },
 583         { 0x0302, "Headphone" },
 584         { 0x0303, "HMD Audio" },
 585         { 0x0304, "Desktop Speaker" },
 586         { 0x0305, "Room Speaker" },
 587         { 0x0306, "Com Speaker" },
 588         { 0x0307, "LFE" },
 589         { 0x0600, "External In" },
 590         { 0x0601, "Analog In" },
 591         { 0x0602, "Digital In" },
 592         { 0x0603, "Line" },
 593         { 0x0604, "Legacy In" },
 594         { 0x0605, "IEC958 In" },
 595         { 0x0606, "1394 DA Stream" },
 596         { 0x0607, "1394 DV Stream" },
 597         { 0x0700, "Embedded" },
 598         { 0x0701, "Noise Source" },
 599         { 0x0702, "Equalization Noise" },
 600         { 0x0703, "CD" },
 601         { 0x0704, "DAT" },
 602         { 0x0705, "DCC" },
 603         { 0x0706, "MiniDisk" },
 604         { 0x0707, "Analog Tape" },
 605         { 0x0708, "Phonograph" },
 606         { 0x0709, "VCR Audio" },
 607         { 0x070a, "Video Disk Audio" },
 608         { 0x070b, "DVD Audio" },
 609         { 0x070c, "TV Tuner Audio" },
 610         { 0x070d, "Satellite Rec Audio" },
 611         { 0x070e, "Cable Tuner Audio" },
 612         { 0x070f, "DSS Audio" },
 613         { 0x0710, "Radio Receiver" },
 614         { 0x0711, "Radio Transmitter" },
 615         { 0x0712, "Multi-Track Recorder" },
 616         { 0x0713, "Synthesizer" },
 617         { 0 },
 618 };
 619
 620 static int get_term_name(struct mixer_build *state, struct usb_audio_term *iterm,
 621                          unsigned char *name, int maxlen, int term_only)
 622 {
 623         struct iterm_name_combo *names;
 624
 625         if (iterm->name)
 626                 return snd_usb_copy_string_desc(state, iterm->name, name, maxlen);
 627
 628         /* virtual type - not a real terminal */
 629         if (iterm->type >> 16) {
 630                 if (term_only)
 631                         return 0;
 632                 switch (iterm->type >> 16) {
 633                 case UAC_SELECTOR_UNIT:
 634                         strcpy(name, "Selector"); return 8;
 635                 case UAC1_PROCESSING_UNIT:
 636                         strcpy(name, "Process Unit"); return 12;
 637                 case UAC1_EXTENSION_UNIT:
 638                         strcpy(name, "Ext Unit"); return 8;
 639                 case UAC_MIXER_UNIT:
 640                         strcpy(name, "Mixer"); return 5;
 641                 default:
 642                         return sprintf(name, "Unit %d", iterm->id);
 643                 }
 644         }
 645
 646         switch (iterm->type & 0xff00) {
 647         case 0x0100:
 648                 strcpy(name, "PCM"); return 3;
 649         case 0x0200:
 650                 strcpy(name, "Mic"); return 3;
 651         case 0x0400:
 652                 strcpy(name, "Headset"); return 7;
 653         case 0x0500:
 654                 strcpy(name, "Phone"); return 5;
 655         }
 656
 657         for (names = iterm_names; names->type; names++)
 658                 if (names->type == iterm->type) {
 659                         strcpy(name, names->name);
 660                         return strlen(names->name);
 661                 }
 662         return 0;
 663 }
 664
 665
 666 /*
 667  * parse the source unit recursively until it reaches to a terminal
 668  * or a branched unit.
 669  */
 670 static int check_input_term(struct mixer_build *state, int id, struct usb_audio_term *term)
 671 {
 672         int err;
 673         void *p1;
 674
 675         memset(term, 0, sizeof(*term));
 676         while ((p1 = find_audio_control_unit(state, id)) != NULL) {
 677                 unsigned char *hdr = p1;
 678                 term->id = id;
 679                 switch (hdr[2]) {
 680                 case UAC_INPUT_TERMINAL:
 681                         if (state->mixer->protocol == UAC_VERSION_1) {
 682                                 struct uac_input_terminal_descriptor *d = p1;
 683                                 term->type = le16_to_cpu(d->wTerminalType);
 684                                 term->channels = d->bNrChannels;
 685                                 term->chconfig = le16_to_cpu(d->wChannelConfig);
 686                                 term->name = d->iTerminal;
 687                         } else { /* UAC_VERSION_2 */
 688                                 struct uac2_input_terminal_descriptor *d = p1;
 689                                 term->type = le16_to_cpu(d->wTerminalType);
 690                                 term->channels = d->bNrChannels;
 691                                 term->chconfig = le32_to_cpu(d->bmChannelConfig);
 692                                 term->name = d->iTerminal;
 693
 694                                 /* call recursively to get the clock selectors */
 695                                 err = check_input_term(state, d->bCSourceID, term);
 696                                 if (err < 0)
 697                                         return err;
 698                         }
 699                         return 0;
 700                 case UAC_FEATURE_UNIT: {
 701                         /* the header is the same for v1 and v2 */
 702                         struct uac_feature_unit_descriptor *d = p1;
 703                         id = d->bSourceID;
 704                         break; /* continue to parse */
 705                 }
 706                 case UAC_MIXER_UNIT: {
 707                         struct uac_mixer_unit_descriptor *d = p1;
 708                         term->type = d->bDescriptorSubtype << 16; /* virtual type */
 709                         term->channels = uac_mixer_unit_bNrChannels(d);
 710                         term->chconfig = uac_mixer_unit_wChannelConfig(d, state->mixer->protocol);
 711                         term->name = uac_mixer_unit_iMixer(d);
 712                         return 0;
 713                 }
 714                 case UAC_SELECTOR_UNIT:
 715                 case UAC2_CLOCK_SELECTOR: {
 716                         struct uac_selector_unit_descriptor *d = p1;
 717                         /* call recursively to retrieve the channel info */
 718                         err = check_input_term(state, d->baSourceID[0], term);
 719                         if (err < 0)
 720                                 return err;
 721                         term->type = d->bDescriptorSubtype << 16; /* virtual type */
 722                         term->id = id;
 723                         term->name = uac_selector_unit_iSelector(d);
 724                         return 0;
 725                 }
 726                 case UAC1_PROCESSING_UNIT:
 727                 case UAC1_EXTENSION_UNIT:
 728                 /* UAC2_PROCESSING_UNIT_V2 */
 729                 /* UAC2_EFFECT_UNIT */
 730                 case UAC2_EXTENSION_UNIT_V2: {
 731                         struct uac_processing_unit_descriptor *d = p1;
 732
 733                         if (state->mixer->protocol == UAC_VERSION_2 &&
 734                                 hdr[2] == UAC2_EFFECT_UNIT) {
 735                                 /* UAC2/UAC1 unit IDs overlap here in an
 736                                  * uncompatible way. Ignore this unit for now.
 737                                  */
 738                                 return 0;
 739                         }
 740
 741                         if (d->bNrInPins) {
 742                                 id = d->baSourceID[0];
 743                                 break; /* continue to parse */
 744                         }
 745                         term->type = d->bDescriptorSubtype << 16; /* virtual type */
 746                         term->channels = uac_processing_unit_bNrChannels(d);
 747                         term->chconfig = uac_processing_unit_wChannelConfig(d, state->mixer->protocol);
 748                         term->name = uac_processing_unit_iProcessing(d, state->mixer->protocol);
 749                         return 0;
 750                 }
 751                 case UAC2_CLOCK_SOURCE: {
 752                         struct uac_clock_source_descriptor *d = p1;
 753                         term->type = d->bDescriptorSubtype << 16; /* virtual type */
 754                         term->id = id;
 755                         term->name = d->iClockSource;
 756                         return 0;
 757                 }
 758                 default:
 759                         return -ENODEV;
 760                 }
 761         }
 762         return -ENODEV;
 763 }
 764
 765
 766 /*
 767  * Feature Unit
 768  */
 769
 770 /* feature unit control information */
 771 struct usb_feature_control_info {
 772         const char *name;
 773         unsigned int type;      /* control type (mute, volume, etc.) */
 774 };
 775
 776 static struct usb_feature_control_info audio_feature_info[] = {
 777         { "Mute",                       USB_MIXER_INV_BOOLEAN },
 778         { "Volume",                     USB_MIXER_S16 },
 779         { "Tone Control - Bass",        USB_MIXER_S8 },
 780         { "Tone Control - Mid",         USB_MIXER_S8 },
 781         { "Tone Control - Treble",      USB_MIXER_S8 },
 782         { "Graphic Equalizer",          USB_MIXER_S8 }, /* FIXME: not implemeted yet */
 783         { "Auto Gain Control",          USB_MIXER_BOOLEAN },
 784         { "Delay Control",              USB_MIXER_U16 },
 785         { "Bass Boost",                 USB_MIXER_BOOLEAN },
 786         { "Loudness",                   USB_MIXER_BOOLEAN },
 787         /* UAC2 specific */
 788         { "Input Gain Control",         USB_MIXER_U16 },
 789         { "Input Gain Pad Control",     USB_MIXER_BOOLEAN },
 790         { "Phase Inverter Control",     USB_MIXER_BOOLEAN },
 791 };
 792
 793
 794 /* private_free callback */
 795 static void usb_mixer_elem_free(struct snd_kcontrol *kctl)
 796 {
 797         kfree(kctl->private_data);
 798         kctl->private_data = NULL;
 799 }
 800
 801
 802 /*
 803  * interface to ALSA control for feature/mixer units
 804  */
 805
 806 /* volume control quirks */
 807 static void volume_control_quirks(struct usb_mixer_elem_info *cval,
 808                                   struct snd_kcontrol *kctl)
 809 {
 810         switch (cval->mixer->chip->usb_id) {
 811         case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
 812         case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
 813                 if (strcmp(kctl->id.name, "Effect Duration") == 0) {
 814                         cval->min = 0x0000;
 815                         cval->max = 0xffff;
 816                         cval->res = 0x00e6;
 817                         break;
 818                 }
 819                 if (strcmp(kctl->id.name, "Effect Volume") == 0 ||
 820                     strcmp(kctl->id.name, "Effect Feedback Volume") == 0) {
 821                         cval->min = 0x00;
 822                         cval->max = 0xff;
 823                         break;
 824                 }
 825                 if (strstr(kctl->id.name, "Effect Return") != NULL) {
 826                         cval->min = 0xb706;
 827                         cval->max = 0xff7b;
 828                         cval->res = 0x0073;
 829                         break;
 830                 }
 831                 if ((strstr(kctl->id.name, "Playback Volume") != NULL) ||
 832                         (strstr(kctl->id.name, "Effect Send") != NULL)) {
 833                         cval->min = 0xb5fb; /* -73 dB = 0xb6ff */
 834                         cval->max = 0xfcfe;
 835                         cval->res = 0x0073;
 836                 }
 837                 break;
 838
 839         case USB_ID(0x0763, 0x2081): /* M-Audio Fast Track Ultra 8R */
 840         case USB_ID(0x0763, 0x2080): /* M-Audio Fast Track Ultra */
 841                 if (strcmp(kctl->id.name, "Effect Duration") == 0) {
 842                         snd_printk(KERN_INFO
 843                                 "usb-audio: set quirk for FTU Effect Duration\n");
 844                         cval->min = 0x0000;
 845                         cval->max = 0x7f00;
 846                         cval->res = 0x0100;
 847                         break;
 848                 }
 849                 if (strcmp(kctl->id.name, "Effect Volume") == 0 ||
 850                     strcmp(kctl->id.name, "Effect Feedback Volume") == 0) {
 851                         snd_printk(KERN_INFO
 852                                 "usb-audio: set quirks for FTU Effect Feedback/Volume\n");
 853                         cval->min = 0x00;
 854                         cval->max = 0x7f;
 855                         break;
 856                 }
 857                 break;
 858
 859         case USB_ID(0x0471, 0x0101):
 860         case USB_ID(0x0471, 0x0104):
 861         case USB_ID(0x0471, 0x0105):
 862         case USB_ID(0x0672, 0x1041):
 863         /* quirk for UDA1321/N101.
 864          * note that detection between firmware 2.1.1.7 (N101)
 865          * and later 2.1.1.21 is not very clear from datasheets.
 866          * I hope that the min value is -15360 for newer firmware --jk
 867          */
 868                 if (!strcmp(kctl->id.name, "PCM Playback Volume") &&
 869                     cval->min == -15616) {
 870                         snd_printk(KERN_INFO
 871                                  "set volume quirk for UDA1321/N101 chip\n");
 872                         cval->max = -256;
 873                 }
 874                 break;
 875
 876         case USB_ID(0x046d, 0x09a4):
 877                 if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
 878                         snd_printk(KERN_INFO
 879                                 "set volume quirk for QuickCam E3500\n");
 880                         cval->min = 6080;
 881                         cval->max = 8768;
 882                         cval->res = 192;
 883                 }
 884                 break;
 885
 886         case USB_ID(0x046d, 0x0808):
 887         case USB_ID(0x046d, 0x0809):
 888         case USB_ID(0x046d, 0x081b): /* HD Webcam c310 */
 889         case USB_ID(0x046d, 0x081d): /* HD Webcam c510 */
 890         case USB_ID(0x046d, 0x0825): /* HD Webcam c270 */
 891         case USB_ID(0x046d, 0x0991):
 892         /* Most audio usb devices lie about volume resolution.
 893          * Most Logitech webcams have res = 384.
 894          * Proboly there is some logitech magic behind this number --fishor
 895          */
 896                 if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
 897                         snd_printk(KERN_INFO
 898                                 "set resolution quirk: cval->res = 384\n");
 899                         cval->res = 384;
 900                 }
 901                 break;
 902
 903         }
 904 }
 905
 906 /*
 907  * retrieve the minimum and maximum values for the specified control
 908  */
 909 static int get_min_max_with_quirks(struct usb_mixer_elem_info *cval,
 910                                    int default_min, struct snd_kcontrol *kctl)
 911 {
 912         /* for failsafe */
 913         cval->min = default_min;
 914         cval->max = cval->min + 1;
 915         cval->res = 1;
 916         cval->dBmin = cval->dBmax = 0;
 917
 918         if (cval->val_type == USB_MIXER_BOOLEAN ||
 919             cval->val_type == USB_MIXER_INV_BOOLEAN) {
 920                 cval->initialized = 1;
 921         } else {
 922                 int minchn = 0;
 923                 if (cval->cmask) {
 924                         int i;
 925                         for (i = 0; i < MAX_CHANNELS; i++)
 926                                 if (cval->cmask & (1 << i)) {
 927                                         minchn = i + 1;
 928                                         break;
 929                                 }
 930                 }
 931                 if (get_ctl_value(cval, UAC_GET_MAX, (cval->control << 8) | minchn, &cval->max) < 0 ||
 932                     get_ctl_value(cval, UAC_GET_MIN, (cval->control << 8) | minchn, &cval->min) < 0) {
 933                         snd_printd(KERN_ERR "%d:%d: cannot get min/max values for control %d (id %d)\n",
 934                                    cval->id, snd_usb_ctrl_intf(cval->mixer->chip), cval->control, cval->id);
 935                         return -EINVAL;
 936                 }
 937                 if (get_ctl_value(cval, UAC_GET_RES, (cval->control << 8) | minchn, &cval->res) < 0) {
 938                         cval->res = 1;
 939                 } else {
 940                         int last_valid_res = cval->res;
 941
 942                         while (cval->res > 1) {
 943                                 if (snd_usb_mixer_set_ctl_value(cval, UAC_SET_RES,
 944                                                                 (cval->control << 8) | minchn, cval->res / 2) < 0)
 945                                         break;
 946                                 cval->res /= 2;
 947                         }
 948                         if (get_ctl_value(cval, UAC_GET_RES, (cval->control << 8) | minchn, &cval->res) < 0)
 949                                 cval->res = last_valid_res;
 950                 }
 951                 if (cval->res == 0)
 952                         cval->res = 1;
 953
 954                 /* Additional checks for the proper resolution
 955                  *
 956                  * Some devices report smaller resolutions than actually
 957                  * reacting.  They don't return errors but simply clip
 958                  * to the lower aligned value.
 959                  */
 960                 if (cval->min + cval->res < cval->max) {
 961                         int last_valid_res = cval->res;
 962                         int saved, test, check;
 963                         get_cur_mix_raw(cval, minchn, &saved);
 964                         for (;;) {
 965                                 test = saved;
 966                                 if (test < cval->max)
 967                                         test += cval->res;
 968                                 else
 969                                         test -= cval->res;
 970                                 if (test < cval->min || test > cval->max ||
 971                                     set_cur_mix_value(cval, minchn, 0, test) ||
 972                                     get_cur_mix_raw(cval, minchn, &check)) {
 973                                         cval->res = last_valid_res;
 974                                         break;
 975                                 }
 976                                 if (test == check)
 977                                         break;
 978                                 cval->res *= 2;
 979                         }
 980                         set_cur_mix_value(cval, minchn, 0, saved);
 981                 }
 982
 983                 cval->initialized = 1;
 984         }
 985
 986         if (kctl)
 987                 volume_control_quirks(cval, kctl);
 988
 989         /* USB descriptions contain the dB scale in 1/256 dB unit
 990          * while ALSA TLV contains in 1/100 dB unit
 991          */
 992         cval->dBmin = (convert_signed_value(cval, cval->min) * 100) / 256;
 993         cval->dBmax = (convert_signed_value(cval, cval->max) * 100) / 256;
 994         if (cval->dBmin > cval->dBmax) {
 995                 /* something is wrong; assume it's either from/to 0dB */
 996                 if (cval->dBmin < 0)
 997                         cval->dBmax = 0;
 998                 else if (cval->dBmin > 0)
 999                         cval->dBmin = 0;
1000                 if (cval->dBmin > cval->dBmax) {
1001                         /* totally crap, return an error */
1002                         return -EINVAL;
1003                 }
1004         }
1005
1006         return 0;
1007 }
1008
1009 #define get_min_max(cval, def)  get_min_max_with_quirks(cval, def, NULL)
1010
1011 /* get a feature/mixer unit info */
1012 static int mixer_ctl_feature_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
1013 {
1014         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1015
1016         if (cval->val_type == USB_MIXER_BOOLEAN ||
1017             cval->val_type == USB_MIXER_INV_BOOLEAN)
1018                 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1019         else
1020                 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
1021         uinfo->count = cval->channels;
1022         if (cval->val_type == USB_MIXER_BOOLEAN ||
1023             cval->val_type == USB_MIXER_INV_BOOLEAN) {
1024                 uinfo->value.integer.min = 0;
1025                 uinfo->value.integer.max = 1;
1026         } else {
1027                 if (!cval->initialized) {
1028                         get_min_max_with_quirks(cval, 0, kcontrol);
1029                         if (cval->initialized && cval->dBmin >= cval->dBmax) {
1030                                 kcontrol->vd[0].access &=
1031                                         ~(SNDRV_CTL_ELEM_ACCESS_TLV_READ |
1032                                           SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK);
1033                                 snd_ctl_notify(cval->mixer->chip->card,
1034                                                SNDRV_CTL_EVENT_MASK_INFO,
1035                                                &kcontrol->id);
1036                         }
1037                 }
1038                 uinfo->value.integer.min = 0;
1039                 uinfo->value.integer.max =
1040                         (cval->max - cval->min + cval->res - 1) / cval->res;
1041         }
1042         return 0;
1043 }
1044
1045 /* get the current value from feature/mixer unit */
1046 static int mixer_ctl_feature_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1047 {
1048         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1049         int c, cnt, val, err;
1050
1051         ucontrol->value.integer.value[0] = cval->min;
1052         if (cval->cmask) {
1053                 cnt = 0;
1054                 for (c = 0; c < MAX_CHANNELS; c++) {
1055                         if (!(cval->cmask & (1 << c)))
1056                                 continue;
1057                         err = get_cur_mix_value(cval, c + 1, cnt, &val);
1058                         if (err < 0)
1059                                 return cval->mixer->ignore_ctl_error ? 0 : err;
1060                         val = get_relative_value(cval, val);
1061                         ucontrol->value.integer.value[cnt] = val;
1062                         cnt++;
1063                 }
1064                 return 0;
1065         } else {
1066                 /* master channel */
1067                 err = get_cur_mix_value(cval, 0, 0, &val);
1068                 if (err < 0)
1069                         return cval->mixer->ignore_ctl_error ? 0 : err;
1070                 val = get_relative_value(cval, val);
1071                 ucontrol->value.integer.value[0] = val;
1072         }
1073         return 0;
1074 }
1075
1076 /* put the current value to feature/mixer unit */
1077 static int mixer_ctl_feature_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1078 {
1079         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1080         int c, cnt, val, oval, err;
1081         int changed = 0;
1082
1083         if (cval->cmask) {
1084                 cnt = 0;
1085                 for (c = 0; c < MAX_CHANNELS; c++) {
1086                         if (!(cval->cmask & (1 << c)))
1087                                 continue;
1088                         err = get_cur_mix_value(cval, c + 1, cnt, &oval);
1089                         if (err < 0)
1090                                 return cval->mixer->ignore_ctl_error ? 0 : err;
1091                         val = ucontrol->value.integer.value[cnt];
1092                         val = get_abs_value(cval, val);
1093                         if (oval != val) {
1094                                 set_cur_mix_value(cval, c + 1, cnt, val);
1095                                 changed = 1;
1096                         }
1097                         cnt++;
1098                 }
1099         } else {
1100                 /* master channel */
1101                 err = get_cur_mix_value(cval, 0, 0, &oval);
1102                 if (err < 0)
1103                         return cval->mixer->ignore_ctl_error ? 0 : err;
1104                 val = ucontrol->value.integer.value[0];
1105                 val = get_abs_value(cval, val);
1106                 if (val != oval) {
1107                         set_cur_mix_value(cval, 0, 0, val);
1108                         changed = 1;
1109                 }
1110         }
1111         return changed;
1112 }
1113
1114 static struct snd_kcontrol_new usb_feature_unit_ctl = {
1115         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1116         .name = "", /* will be filled later manually */
1117         .info = mixer_ctl_feature_info,
1118         .get = mixer_ctl_feature_get,
1119         .put = mixer_ctl_feature_put,
1120 };
1121
1122 /* the read-only variant */
1123 static struct snd_kcontrol_new usb_feature_unit_ctl_ro = {
1124         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1125         .name = "", /* will be filled later manually */
1126         .info = mixer_ctl_feature_info,
1127         .get = mixer_ctl_feature_get,
1128         .put = NULL,
1129 };
1130
1131 /* This symbol is exported in order to allow the mixer quirks to
1132  * hook up to the standard feature unit control mechanism */
1133 struct snd_kcontrol_new *snd_usb_feature_unit_ctl = &usb_feature_unit_ctl;
1134
1135 /*
1136  * build a feature control
1137  */
1138
1139 static size_t append_ctl_name(struct snd_kcontrol *kctl, const char *str)
1140 {
1141         return strlcat(kctl->id.name, str, sizeof(kctl->id.name));
1142 }
1143
1144 /* A lot of headsets/headphones have a "Speaker" mixer. Make sure we
1145    rename it to "Headphone". We determine if something is a headphone
1146    similar to how udev determines form factor. */
1147 static void check_no_speaker_on_headset(struct snd_kcontrol *kctl,
1148                                         struct snd_card *card)
1149 {
1150         const char *names_to_check[] = {
1151                 "Headset", "headset", "Headphone", "headphone", NULL};
1152         const char **s;
1153         bool found = 0;
1154
1155         if (strcmp("Speaker", kctl->id.name))
1156                 return;
1157
1158         for (s = names_to_check; *s; s++)
1159                 if (strstr(card->shortname, *s)) {
1160                         found = 1;
1161                         break;
1162                 }
1163
1164         if (!found)
1165                 return;
1166
1167         strlcpy(kctl->id.name, "Headphone", sizeof(kctl->id.name));
1168 }
1169
1170 static void build_feature_ctl(struct mixer_build *state, void *raw_desc,
1171                               unsigned int ctl_mask, int control,
1172                               struct usb_audio_term *iterm, int unitid,
1173                               int readonly_mask)
1174 {
1175         struct uac_feature_unit_descriptor *desc = raw_desc;
1176         unsigned int len = 0;
1177         int mapped_name = 0;
1178         int nameid = uac_feature_unit_iFeature(desc);
1179         struct snd_kcontrol *kctl;
1180         struct usb_mixer_elem_info *cval;
1181         const struct usbmix_name_map *map;
1182         unsigned int range;
1183
1184         control++; /* change from zero-based to 1-based value */
1185
1186         if (control == UAC_FU_GRAPHIC_EQUALIZER) {
1187                 /* FIXME: not supported yet */
1188                 return;
1189         }
1190
1191         map = find_map(state, unitid, control);
1192         if (check_ignored_ctl(map))
1193                 return;
1194
1195         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1196         if (! cval) {
1197                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1198                 return;
1199         }
1200         cval->mixer = state->mixer;
1201         cval->id = unitid;
1202         cval->control = control;
1203         cval->cmask = ctl_mask;
1204         cval->val_type = audio_feature_info[control-1].type;
1205         if (ctl_mask == 0) {
1206                 cval->channels = 1;     /* master channel */
1207                 cval->master_readonly = readonly_mask;
1208         } else {
1209                 int i, c = 0;
1210                 for (i = 0; i < 16; i++)
1211                         if (ctl_mask & (1 << i))
1212                                 c++;
1213                 cval->channels = c;
1214                 cval->ch_readonly = readonly_mask;
1215         }
1216
1217         /* if all channels in the mask are marked read-only, make the control
1218          * read-only. set_cur_mix_value() will check the mask again and won't
1219          * issue write commands to read-only channels. */
1220         if (cval->channels == readonly_mask)
1221                 kctl = snd_ctl_new1(&usb_feature_unit_ctl_ro, cval);
1222         else
1223                 kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
1224
1225         if (! kctl) {
1226                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1227                 kfree(cval);
1228                 return;
1229         }
1230         kctl->private_free = usb_mixer_elem_free;
1231
1232         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
1233         mapped_name = len != 0;
1234         if (! len && nameid)
1235                 len = snd_usb_copy_string_desc(state, nameid,
1236                                 kctl->id.name, sizeof(kctl->id.name));
1237
1238         switch (control) {
1239         case UAC_FU_MUTE:
1240         case UAC_FU_VOLUME:
1241                 /* determine the control name.  the rule is:
1242                  * - if a name id is given in descriptor, use it.
1243                  * - if the connected input can be determined, then use the name
1244                  *   of terminal type.
1245                  * - if the connected output can be determined, use it.
1246                  * - otherwise, anonymous name.
1247                  */
1248                 if (! len) {
1249                         len = get_term_name(state, iterm, kctl->id.name, sizeof(kctl->id.name), 1);
1250                         if (! len)
1251                                 len = get_term_name(state, &state->oterm, kctl->id.name, sizeof(kctl->id.name), 1);
1252                         if (! len)
1253                                 len = snprintf(kctl->id.name, sizeof(kctl->id.name),
1254                                                "Feature %d", unitid);
1255                 }
1256
1257                 if (!mapped_name)
1258                         check_no_speaker_on_headset(kctl, state->mixer->chip->card);
1259
1260                 /* determine the stream direction:
1261                  * if the connected output is USB stream, then it's likely a
1262                  * capture stream.  otherwise it should be playback (hopefully :)
1263                  */
1264                 if (! mapped_name && ! (state->oterm.type >> 16)) {
1265                         if ((state->oterm.type & 0xff00) == 0x0100) {
1266                                 len = append_ctl_name(kctl, " Capture");
1267                         } else {
1268                                 len = append_ctl_name(kctl, " Playback");
1269                         }
1270                 }
1271                 append_ctl_name(kctl, control == UAC_FU_MUTE ?
1272                                 " Switch" : " Volume");
1273                 break;
1274         default:
1275                 if (! len)
1276                         strlcpy(kctl->id.name, audio_feature_info[control-1].name,
1277                                 sizeof(kctl->id.name));
1278                 break;
1279         }
1280
1281         /* get min/max values */
1282         get_min_max_with_quirks(cval, 0, kctl);
1283
1284         if (control == UAC_FU_VOLUME) {
1285                 check_mapped_dB(map, cval);
1286                 if (cval->dBmin < cval->dBmax || !cval->initialized) {
1287                         kctl->tlv.c = snd_usb_mixer_vol_tlv;
1288                         kctl->vd[0].access |=
1289                                 SNDRV_CTL_ELEM_ACCESS_TLV_READ |
1290                                 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
1291                 }
1292         }
1293
1294         range = (cval->max - cval->min) / cval->res;
1295         /* Are there devices with volume range more than 255? I use a bit more
1296          * to be sure. 384 is a resolution magic number found on Logitech
1297          * devices. It will definitively catch all buggy Logitech devices.
1298          */
1299         if (range > 384) {
1300                 snd_printk(KERN_WARNING "usb_audio: Warning! Unlikely big "
1301                            "volume range (=%u), cval->res is probably wrong.",
1302                            range);
1303                 snd_printk(KERN_WARNING "usb_audio: [%d] FU [%s] ch = %d, "
1304                            "val = %d/%d/%d", cval->id,
1305                            kctl->id.name, cval->channels,
1306                            cval->min, cval->max, cval->res);
1307         }
1308
1309         snd_printdd(KERN_INFO "[%d] FU [%s] ch = %d, val = %d/%d/%d\n",
1310                     cval->id, kctl->id.name, cval->channels, cval->min, cval->max, cval->res);
1311         snd_usb_mixer_add_control(state->mixer, kctl);
1312 }
1313
1314
1315
1316 /*
1317  * parse a feature unit
1318  *
1319  * most of controls are defined here.
1320  */
1321 static int parse_audio_feature_unit(struct mixer_build *state, int unitid, void *_ftr)
1322 {
1323         int channels, i, j;
1324         struct usb_audio_term iterm;
1325         unsigned int master_bits, first_ch_bits;
1326         int err, csize;
1327         struct uac_feature_unit_descriptor *hdr = _ftr;
1328         __u8 *bmaControls;
1329
1330         if (state->mixer->protocol == UAC_VERSION_1) {
1331                 csize = hdr->bControlSize;
1332                 if (!csize) {
1333                         snd_printdd(KERN_ERR "usbaudio: unit %u: "
1334                                     "invalid bControlSize == 0\n", unitid);
1335                         return -EINVAL;
1336                 }
1337                 channels = (hdr->bLength - 7) / csize - 1;
1338                 bmaControls = hdr->bmaControls;
1339                 if (hdr->bLength < 7 + csize) {
1340                         snd_printk(KERN_ERR "usbaudio: unit %u: "
1341                                    "invalid UAC_FEATURE_UNIT descriptor\n",
1342                                    unitid);
1343                         return -EINVAL;
1344                 }
1345         } else {
1346                 struct uac2_feature_unit_descriptor *ftr = _ftr;
1347                 csize = 4;
1348                 channels = (hdr->bLength - 6) / 4 - 1;
1349                 bmaControls = ftr->bmaControls;
1350                 if (hdr->bLength < 6 + csize) {
1351                         snd_printk(KERN_ERR "usbaudio: unit %u: "
1352                                    "invalid UAC_FEATURE_UNIT descriptor\n",
1353                                    unitid);
1354                         return -EINVAL;
1355                 }
1356         }
1357
1358         /* parse the source unit */
1359         if ((err = parse_audio_unit(state, hdr->bSourceID)) < 0)
1360                 return err;
1361
1362         /* determine the input source type and name */
1363         err = check_input_term(state, hdr->bSourceID, &iterm);
1364         if (err < 0)
1365                 return err;
1366
1367         master_bits = snd_usb_combine_bytes(bmaControls, csize);
1368         /* master configuration quirks */
1369         switch (state->chip->usb_id) {
1370         case USB_ID(0x08bb, 0x2702):
1371                 snd_printk(KERN_INFO
1372                            "usbmixer: master volume quirk for PCM2702 chip\n");
1373                 /* disable non-functional volume control */
1374                 master_bits &= ~UAC_CONTROL_BIT(UAC_FU_VOLUME);
1375                 break;
1376         case USB_ID(0x1130, 0xf211):
1377                 snd_printk(KERN_INFO
1378                            "usbmixer: volume control quirk for Tenx TP6911 Audio Headset\n");
1379                 /* disable non-functional volume control */
1380                 channels = 0;
1381                 break;
1382
1383         }
1384         if (channels > 0)
1385                 first_ch_bits = snd_usb_combine_bytes(bmaControls + csize, csize);
1386         else
1387                 first_ch_bits = 0;
1388
1389         if (state->mixer->protocol == UAC_VERSION_1) {
1390                 /* check all control types */
1391                 for (i = 0; i < 10; i++) {
1392                         unsigned int ch_bits = 0;
1393                         for (j = 0; j < channels; j++) {
1394                                 unsigned int mask = snd_usb_combine_bytes(bmaControls + csize * (j+1), csize);
1395                                 if (mask & (1 << i))
1396                                         ch_bits |= (1 << j);
1397                         }
1398                         /* audio class v1 controls are never read-only */
1399                         if (ch_bits & 1) /* the first channel must be set (for ease of programming) */
1400                                 build_feature_ctl(state, _ftr, ch_bits, i, &iterm, unitid, 0);
1401                         if (master_bits & (1 << i))
1402                                 build_feature_ctl(state, _ftr, 0, i, &iterm, unitid, 0);
1403                 }
1404         } else { /* UAC_VERSION_2 */
1405                 for (i = 0; i < ARRAY_SIZE(audio_feature_info); i++) {
1406                         unsigned int ch_bits = 0;
1407                         unsigned int ch_read_only = 0;
1408
1409                         for (j = 0; j < channels; j++) {
1410                                 unsigned int mask = snd_usb_combine_bytes(bmaControls + csize * (j+1), csize);
1411                                 if (uac2_control_is_readable(mask, i)) {
1412                                         ch_bits |= (1 << j);
1413                                         if (!uac2_control_is_writeable(mask, i))
1414                                                 ch_read_only |= (1 << j);
1415                                 }
1416                         }
1417
1418                         /* NOTE: build_feature_ctl() will mark the control read-only if all channels
1419                          * are marked read-only in the descriptors. Otherwise, the control will be
1420                          * reported as writeable, but the driver will not actually issue a write
1421                          * command for read-only channels */
1422                         if (ch_bits & 1) /* the first channel must be set (for ease of programming) */
1423                                 build_feature_ctl(state, _ftr, ch_bits, i, &iterm, unitid, ch_read_only);
1424                         if (uac2_control_is_readable(master_bits, i))
1425                                 build_feature_ctl(state, _ftr, 0, i, &iterm, unitid,
1426                                                   !uac2_control_is_writeable(master_bits, i));
1427                 }
1428         }
1429
1430         return 0;
1431 }
1432
1433
1434 /*
1435  * Mixer Unit
1436  */
1437
1438 /*
1439  * build a mixer unit control
1440  *
1441  * the callbacks are identical with feature unit.
1442  * input channel number (zero based) is given in control field instead.
1443  */
1444
1445 static void build_mixer_unit_ctl(struct mixer_build *state,
1446                                  struct uac_mixer_unit_descriptor *desc,
1447                                  int in_pin, int in_ch, int unitid,
1448                                  struct usb_audio_term *iterm)
1449 {
1450         struct usb_mixer_elem_info *cval;
1451         unsigned int num_outs = uac_mixer_unit_bNrChannels(desc);
1452         unsigned int i, len;
1453         struct snd_kcontrol *kctl;
1454         const struct usbmix_name_map *map;
1455
1456         map = find_map(state, unitid, 0);
1457         if (check_ignored_ctl(map))
1458                 return;
1459
1460         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1461         if (! cval)
1462                 return;
1463
1464         cval->mixer = state->mixer;
1465         cval->id = unitid;
1466         cval->control = in_ch + 1; /* based on 1 */
1467         cval->val_type = USB_MIXER_S16;
1468         for (i = 0; i < num_outs; i++) {
1469                 if (check_matrix_bitmap(uac_mixer_unit_bmControls(desc, state->mixer->protocol), in_ch, i, num_outs)) {
1470                         cval->cmask |= (1 << i);
1471                         cval->channels++;
1472                 }
1473         }
1474
1475         /* get min/max values */
1476         get_min_max(cval, 0);
1477
1478         kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
1479         if (! kctl) {
1480                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1481                 kfree(cval);
1482                 return;
1483         }
1484         kctl->private_free = usb_mixer_elem_free;
1485
1486         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
1487         if (! len)
1488                 len = get_term_name(state, iterm, kctl->id.name, sizeof(kctl->id.name), 0);
1489         if (! len)
1490                 len = sprintf(kctl->id.name, "Mixer Source %d", in_ch + 1);
1491         append_ctl_name(kctl, " Volume");
1492
1493         snd_printdd(KERN_INFO "[%d] MU [%s] ch = %d, val = %d/%d\n",
1494                     cval->id, kctl->id.name, cval->channels, cval->min, cval->max);
1495         snd_usb_mixer_add_control(state->mixer, kctl);
1496 }
1497
1498
1499 /*
1500  * parse a mixer unit
1501  */
1502 static int parse_audio_mixer_unit(struct mixer_build *state, int unitid, void *raw_desc)
1503 {
1504         struct uac_mixer_unit_descriptor *desc = raw_desc;
1505         struct usb_audio_term iterm;
1506         int input_pins, num_ins, num_outs;
1507         int pin, ich, err;
1508
1509         if (desc->bLength < 11 || ! (input_pins = desc->bNrInPins) || ! (num_outs = uac_mixer_unit_bNrChannels(desc))) {
1510                 snd_printk(KERN_ERR "invalid MIXER UNIT descriptor %d\n", unitid);
1511                 return -EINVAL;
1512         }
1513         /* no bmControls field (e.g. Maya44) -> ignore */
1514         if (desc->bLength <= 10 + input_pins) {
1515                 snd_printdd(KERN_INFO "MU %d has no bmControls field\n", unitid);
1516                 return 0;
1517         }
1518
1519         num_ins = 0;
1520         ich = 0;
1521         for (pin = 0; pin < input_pins; pin++) {
1522                 err = parse_audio_unit(state, desc->baSourceID[pin]);
1523                 if (err < 0)
1524                         continue;
1525                 err = check_input_term(state, desc->baSourceID[pin], &iterm);
1526                 if (err < 0)
1527                         return err;
1528                 num_ins += iterm.channels;
1529                 for (; ich < num_ins; ++ich) {
1530                         int och, ich_has_controls = 0;
1531
1532                         for (och = 0; och < num_outs; ++och) {
1533                                 if (check_matrix_bitmap(uac_mixer_unit_bmControls(desc, state->mixer->protocol),
1534                                                         ich, och, num_outs)) {
1535                                         ich_has_controls = 1;
1536                                         break;
1537                                 }
1538                         }
1539                         if (ich_has_controls)
1540                                 build_mixer_unit_ctl(state, desc, pin, ich,
1541                                                      unitid, &iterm);
1542                 }
1543         }
1544         return 0;
1545 }
1546
1547
1548 /*
1549  * Processing Unit / Extension Unit
1550  */
1551
1552 /* get callback for processing/extension unit */
1553 static int mixer_ctl_procunit_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1554 {
1555         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1556         int err, val;
1557
1558         err = get_cur_ctl_value(cval, cval->control << 8, &val);
1559         if (err < 0 && cval->mixer->ignore_ctl_error) {
1560                 ucontrol->value.integer.value[0] = cval->min;
1561                 return 0;
1562         }
1563         if (err < 0)
1564                 return err;
1565         val = get_relative_value(cval, val);
1566         ucontrol->value.integer.value[0] = val;
1567         return 0;
1568 }
1569
1570 /* put callback for processing/extension unit */
1571 static int mixer_ctl_procunit_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1572 {
1573         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1574         int val, oval, err;
1575
1576         err = get_cur_ctl_value(cval, cval->control << 8, &oval);
1577         if (err < 0) {
1578                 if (cval->mixer->ignore_ctl_error)
1579                         return 0;
1580                 return err;
1581         }
1582         val = ucontrol->value.integer.value[0];
1583         val = get_abs_value(cval, val);
1584         if (val != oval) {
1585                 set_cur_ctl_value(cval, cval->control << 8, val);
1586                 return 1;
1587         }
1588         return 0;
1589 }
1590
1591 /* alsa control interface for processing/extension unit */
1592 static struct snd_kcontrol_new mixer_procunit_ctl = {
1593         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1594         .name = "", /* will be filled later */
1595         .info = mixer_ctl_feature_info,
1596         .get = mixer_ctl_procunit_get,
1597         .put = mixer_ctl_procunit_put,
1598 };
1599
1600
1601 /*
1602  * predefined data for processing units
1603  */
1604 struct procunit_value_info {
1605         int control;
1606         char *suffix;
1607         int val_type;
1608         int min_value;
1609 };
1610
1611 struct procunit_info {
1612         int type;
1613         char *name;
1614         struct procunit_value_info *values;
1615 };
1616
1617 static struct procunit_value_info updown_proc_info[] = {
1618         { UAC_UD_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1619         { UAC_UD_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
1620         { 0 }
1621 };
1622 static struct procunit_value_info prologic_proc_info[] = {
1623         { UAC_DP_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1624         { UAC_DP_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
1625         { 0 }
1626 };
1627 static struct procunit_value_info threed_enh_proc_info[] = {
1628         { UAC_3D_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1629         { UAC_3D_SPACE, "Spaciousness", USB_MIXER_U8 },
1630         { 0 }
1631 };
1632 static struct procunit_value_info reverb_proc_info[] = {
1633         { UAC_REVERB_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1634         { UAC_REVERB_LEVEL, "Level", USB_MIXER_U8 },
1635         { UAC_REVERB_TIME, "Time", USB_MIXER_U16 },
1636         { UAC_REVERB_FEEDBACK, "Feedback", USB_MIXER_U8 },
1637         { 0 }
1638 };
1639 static struct procunit_value_info chorus_proc_info[] = {
1640         { UAC_CHORUS_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1641         { UAC_CHORUS_LEVEL, "Level", USB_MIXER_U8 },
1642         { UAC_CHORUS_RATE, "Rate", USB_MIXER_U16 },
1643         { UAC_CHORUS_DEPTH, "Depth", USB_MIXER_U16 },
1644         { 0 }
1645 };
1646 static struct procunit_value_info dcr_proc_info[] = {
1647         { UAC_DCR_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1648         { UAC_DCR_RATE, "Ratio", USB_MIXER_U16 },
1649         { UAC_DCR_MAXAMPL, "Max Amp", USB_MIXER_S16 },
1650         { UAC_DCR_THRESHOLD, "Threshold", USB_MIXER_S16 },
1651         { UAC_DCR_ATTACK_TIME, "Attack Time", USB_MIXER_U16 },
1652         { UAC_DCR_RELEASE_TIME, "Release Time", USB_MIXER_U16 },
1653         { 0 }
1654 };
1655
1656 static struct procunit_info procunits[] = {
1657         { UAC_PROCESS_UP_DOWNMIX, "Up Down", updown_proc_info },
1658         { UAC_PROCESS_DOLBY_PROLOGIC, "Dolby Prologic", prologic_proc_info },
1659         { UAC_PROCESS_STEREO_EXTENDER, "3D Stereo Extender", threed_enh_proc_info },
1660         { UAC_PROCESS_REVERB, "Reverb", reverb_proc_info },
1661         { UAC_PROCESS_CHORUS, "Chorus", chorus_proc_info },
1662         { UAC_PROCESS_DYN_RANGE_COMP, "DCR", dcr_proc_info },
1663         { 0 },
1664 };
1665 /*
1666  * predefined data for extension units
1667  */
1668 static struct procunit_value_info clock_rate_xu_info[] = {
1669         { USB_XU_CLOCK_RATE_SELECTOR, "Selector", USB_MIXER_U8, 0 },
1670         { 0 }
1671 };
1672 static struct procunit_value_info clock_source_xu_info[] = {
1673         { USB_XU_CLOCK_SOURCE_SELECTOR, "External", USB_MIXER_BOOLEAN },
1674         { 0 }
1675 };
1676 static struct procunit_value_info spdif_format_xu_info[] = {
1677         { USB_XU_DIGITAL_FORMAT_SELECTOR, "SPDIF/AC3", USB_MIXER_BOOLEAN },
1678         { 0 }
1679 };
1680 static struct procunit_value_info soft_limit_xu_info[] = {
1681         { USB_XU_SOFT_LIMIT_SELECTOR, " ", USB_MIXER_BOOLEAN },
1682         { 0 }
1683 };
1684 static struct procunit_info extunits[] = {
1685         { USB_XU_CLOCK_RATE, "Clock rate", clock_rate_xu_info },
1686         { USB_XU_CLOCK_SOURCE, "DigitalIn CLK source", clock_source_xu_info },
1687         { USB_XU_DIGITAL_IO_STATUS, "DigitalOut format:", spdif_format_xu_info },
1688         { USB_XU_DEVICE_OPTIONS, "AnalogueIn Soft Limit", soft_limit_xu_info },
1689         { 0 }
1690 };
1691 /*
1692  * build a processing/extension unit
1693  */
1694 static int build_audio_procunit(struct mixer_build *state, int unitid, void *raw_desc, struct procunit_info *list, char *name)
1695 {
1696         struct uac_processing_unit_descriptor *desc = raw_desc;
1697         int num_ins = desc->bNrInPins;
1698         struct usb_mixer_elem_info *cval;
1699         struct snd_kcontrol *kctl;
1700         int i, err, nameid, type, len;
1701         struct procunit_info *info;
1702         struct procunit_value_info *valinfo;
1703         const struct usbmix_name_map *map;
1704         static struct procunit_value_info default_value_info[] = {
1705                 { 0x01, "Switch", USB_MIXER_BOOLEAN },
1706                 { 0 }
1707         };
1708         static struct procunit_info default_info = {
1709                 0, NULL, default_value_info
1710         };
1711
1712         if (desc->bLength < 13 || desc->bLength < 13 + num_ins ||
1713             desc->bLength < num_ins + uac_processing_unit_bControlSize(desc, state->mixer->protocol)) {
1714                 snd_printk(KERN_ERR "invalid %s descriptor (id %d)\n", name, unitid);
1715                 return -EINVAL;
1716         }
1717
1718         for (i = 0; i < num_ins; i++) {
1719                 if ((err = parse_audio_unit(state, desc->baSourceID[i])) < 0)
1720                         return err;
1721         }
1722
1723         type = le16_to_cpu(desc->wProcessType);
1724         for (info = list; info && info->type; info++)
1725                 if (info->type == type)
1726                         break;
1727         if (! info || ! info->type)
1728                 info = &default_info;
1729
1730         for (valinfo = info->values; valinfo->control; valinfo++) {
1731                 __u8 *controls = uac_processing_unit_bmControls(desc, state->mixer->protocol);
1732
1733                 if (! (controls[valinfo->control / 8] & (1 << ((valinfo->control % 8) - 1))))
1734                         continue;
1735                 map = find_map(state, unitid, valinfo->control);
1736                 if (check_ignored_ctl(map))
1737                         continue;
1738                 cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1739                 if (! cval) {
1740                         snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1741                         return -ENOMEM;
1742                 }
1743                 cval->mixer = state->mixer;
1744                 cval->id = unitid;
1745                 cval->control = valinfo->control;
1746                 cval->val_type = valinfo->val_type;
1747                 cval->channels = 1;
1748
1749                 /* get min/max values */
1750                 if (type == UAC_PROCESS_UP_DOWNMIX && cval->control == UAC_UD_MODE_SELECT) {
1751                         __u8 *control_spec = uac_processing_unit_specific(desc, state->mixer->protocol);
1752                         /* FIXME: hard-coded */
1753                         cval->min = 1;
1754                         cval->max = control_spec[0];
1755                         cval->res = 1;
1756                         cval->initialized = 1;
1757                 } else {
1758                         if (type == USB_XU_CLOCK_RATE) {
1759                                 /* E-Mu USB 0404/0202/TrackerPre/0204
1760                                  * samplerate control quirk
1761                                  */
1762                                 cval->min = 0;
1763                                 cval->max = 5;
1764                                 cval->res = 1;
1765                                 cval->initialized = 1;
1766                         } else
1767                                 get_min_max(cval, valinfo->min_value);
1768                 }
1769
1770                 kctl = snd_ctl_new1(&mixer_procunit_ctl, cval);
1771                 if (! kctl) {
1772                         snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1773                         kfree(cval);
1774                         return -ENOMEM;
1775                 }
1776                 kctl->private_free = usb_mixer_elem_free;
1777
1778                 if (check_mapped_name(map, kctl->id.name,
1779                                                 sizeof(kctl->id.name)))
1780                         /* nothing */ ;
1781                 else if (info->name)
1782                         strlcpy(kctl->id.name, info->name, sizeof(kctl->id.name));
1783                 else {
1784                         nameid = uac_processing_unit_iProcessing(desc, state->mixer->protocol);
1785                         len = 0;
1786                         if (nameid)
1787                                 len = snd_usb_copy_string_desc(state, nameid, kctl->id.name, sizeof(kctl->id.name));
1788                         if (! len)
1789                                 strlcpy(kctl->id.name, name, sizeof(kctl->id.name));
1790                 }
1791                 append_ctl_name(kctl, " ");
1792                 append_ctl_name(kctl, valinfo->suffix);
1793
1794                 snd_printdd(KERN_INFO "[%d] PU [%s] ch = %d, val = %d/%d\n",
1795                             cval->id, kctl->id.name, cval->channels, cval->min, cval->max);
1796                 if ((err = snd_usb_mixer_add_control(state->mixer, kctl)) < 0)
1797                         return err;
1798         }
1799         return 0;
1800 }
1801
1802
1803 static int parse_audio_processing_unit(struct mixer_build *state, int unitid, void *raw_desc)
1804 {
1805         return build_audio_procunit(state, unitid, raw_desc, procunits, "Processing Unit");
1806 }
1807
1808 static int parse_audio_extension_unit(struct mixer_build *state, int unitid, void *raw_desc)
1809 {
1810         /* Note that we parse extension units with processing unit descriptors.
1811          * That's ok as the layout is the same */
1812         return build_audio_procunit(state, unitid, raw_desc, extunits, "Extension Unit");
1813 }
1814
1815
1816 /*
1817  * Selector Unit
1818  */
1819
1820 /* info callback for selector unit
1821  * use an enumerator type for routing
1822  */
1823 static int mixer_ctl_selector_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
1824 {
1825         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1826         const char **itemlist = (const char **)kcontrol->private_value;
1827
1828         if (snd_BUG_ON(!itemlist))
1829                 return -EINVAL;
1830         return snd_ctl_enum_info(uinfo, 1, cval->max, itemlist);
1831 }
1832
1833 /* get callback for selector unit */
1834 static int mixer_ctl_selector_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1835 {
1836         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1837         int val, err;
1838
1839         err = get_cur_ctl_value(cval, cval->control << 8, &val);
1840         if (err < 0) {
1841                 if (cval->mixer->ignore_ctl_error) {
1842                         ucontrol->value.enumerated.item[0] = 0;
1843                         return 0;
1844                 }
1845                 return err;
1846         }
1847         val = get_relative_value(cval, val);
1848         ucontrol->value.enumerated.item[0] = val;
1849         return 0;
1850 }
1851
1852 /* put callback for selector unit */
1853 static int mixer_ctl_selector_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1854 {
1855         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1856         int val, oval, err;
1857
1858         err = get_cur_ctl_value(cval, cval->control << 8, &oval);
1859         if (err < 0) {
1860                 if (cval->mixer->ignore_ctl_error)
1861                         return 0;
1862                 return err;
1863         }
1864         val = ucontrol->value.enumerated.item[0];
1865         val = get_abs_value(cval, val);
1866         if (val != oval) {
1867                 set_cur_ctl_value(cval, cval->control << 8, val);
1868                 return 1;
1869         }
1870         return 0;
1871 }
1872
1873 /* alsa control interface for selector unit */
1874 static struct snd_kcontrol_new mixer_selectunit_ctl = {
1875         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1876         .name = "", /* will be filled later */
1877         .info = mixer_ctl_selector_info,
1878         .get = mixer_ctl_selector_get,
1879         .put = mixer_ctl_selector_put,
1880 };
1881
1882
1883 /* private free callback.
1884  * free both private_data and private_value
1885  */
1886 static void usb_mixer_selector_elem_free(struct snd_kcontrol *kctl)
1887 {
1888         int i, num_ins = 0;
1889
1890         if (kctl->private_data) {
1891                 struct usb_mixer_elem_info *cval = kctl->private_data;
1892                 num_ins = cval->max;
1893                 kfree(cval);
1894                 kctl->private_data = NULL;
1895         }
1896         if (kctl->private_value) {
1897                 char **itemlist = (char **)kctl->private_value;
1898                 for (i = 0; i < num_ins; i++)
1899                         kfree(itemlist[i]);
1900                 kfree(itemlist);
1901                 kctl->private_value = 0;
1902         }
1903 }
1904
1905 /*
1906  * parse a selector unit
1907  */
1908 static int parse_audio_selector_unit(struct mixer_build *state, int unitid, void *raw_desc)
1909 {
1910         struct uac_selector_unit_descriptor *desc = raw_desc;
1911         unsigned int i, nameid, len;
1912         int err;
1913         struct usb_mixer_elem_info *cval;
1914         struct snd_kcontrol *kctl;
1915         const struct usbmix_name_map *map;
1916         char **namelist;
1917
1918         if (!desc->bNrInPins || desc->bLength < 5 + desc->bNrInPins) {
1919                 snd_printk(KERN_ERR "invalid SELECTOR UNIT descriptor %d\n", unitid);
1920                 return -EINVAL;
1921         }
1922
1923         for (i = 0; i < desc->bNrInPins; i++) {
1924                 if ((err = parse_audio_unit(state, desc->baSourceID[i])) < 0)
1925                         return err;
1926         }
1927
1928         if (desc->bNrInPins == 1) /* only one ? nonsense! */
1929                 return 0;
1930
1931         map = find_map(state, unitid, 0);
1932         if (check_ignored_ctl(map))
1933                 return 0;
1934
1935         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1936         if (! cval) {
1937                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1938                 return -ENOMEM;
1939         }
1940         cval->mixer = state->mixer;
1941         cval->id = unitid;
1942         cval->val_type = USB_MIXER_U8;
1943         cval->channels = 1;
1944         cval->min = 1;
1945         cval->max = desc->bNrInPins;
1946         cval->res = 1;
1947         cval->initialized = 1;
1948
1949         if (desc->bDescriptorSubtype == UAC2_CLOCK_SELECTOR)
1950                 cval->control = UAC2_CX_CLOCK_SELECTOR;
1951         else
1952                 cval->control = 0;
1953
1954         namelist = kmalloc(sizeof(char *) * desc->bNrInPins, GFP_KERNEL);
1955         if (! namelist) {
1956                 snd_printk(KERN_ERR "cannot malloc\n");
1957                 kfree(cval);
1958                 return -ENOMEM;
1959         }
1960 #define MAX_ITEM_NAME_LEN       64
1961         for (i = 0; i < desc->bNrInPins; i++) {
1962                 struct usb_audio_term iterm;
1963                 len = 0;
1964                 namelist[i] = kmalloc(MAX_ITEM_NAME_LEN, GFP_KERNEL);
1965                 if (! namelist[i]) {
1966                         snd_printk(KERN_ERR "cannot malloc\n");
1967                         while (i--)
1968                                 kfree(namelist[i]);
1969                         kfree(namelist);
1970                         kfree(cval);
1971                         return -ENOMEM;
1972                 }
1973                 len = check_mapped_selector_name(state, unitid, i, namelist[i],
1974                                                  MAX_ITEM_NAME_LEN);
1975                 if (! len && check_input_term(state, desc->baSourceID[i], &iterm) >= 0)
1976                         len = get_term_name(state, &iterm, namelist[i], MAX_ITEM_NAME_LEN, 0);
1977                 if (! len)
1978                         sprintf(namelist[i], "Input %d", i);
1979         }
1980
1981         kctl = snd_ctl_new1(&mixer_selectunit_ctl, cval);
1982         if (! kctl) {
1983                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1984                 kfree(namelist);
1985                 kfree(cval);
1986                 return -ENOMEM;
1987         }
1988         kctl->private_value = (unsigned long)namelist;
1989         kctl->private_free = usb_mixer_selector_elem_free;
1990
1991         nameid = uac_selector_unit_iSelector(desc);
1992         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
1993         if (len)
1994                 ;
1995         else if (nameid)
1996                 snd_usb_copy_string_desc(state, nameid, kctl->id.name, sizeof(kctl->id.name));
1997         else {
1998                 len = get_term_name(state, &state->oterm,
1999                                     kctl->id.name, sizeof(kctl->id.name), 0);
2000                 if (! len)
2001                         strlcpy(kctl->id.name, "USB", sizeof(kctl->id.name));
2002
2003                 if (desc->bDescriptorSubtype == UAC2_CLOCK_SELECTOR)
2004                         append_ctl_name(kctl, " Clock Source");
2005                 else if ((state->oterm.type & 0xff00) == 0x0100)
2006                         append_ctl_name(kctl, " Capture Source");
2007                 else
2008                         append_ctl_name(kctl, " Playback Source");
2009         }
2010
2011         snd_printdd(KERN_INFO "[%d] SU [%s] items = %d\n",
2012                     cval->id, kctl->id.name, desc->bNrInPins);
2013         if ((err = snd_usb_mixer_add_control(state->mixer, kctl)) < 0)
2014                 return err;
2015
2016         return 0;
2017 }
2018
2019
2020 /*
2021  * parse an audio unit recursively
2022  */
2023
2024 static int parse_audio_unit(struct mixer_build *state, int unitid)
2025 {
2026         unsigned char *p1;
2027
2028         if (test_and_set_bit(unitid, state->unitbitmap))
2029                 return 0; /* the unit already visited */
2030
2031         p1 = find_audio_control_unit(state, unitid);
2032         if (!p1) {
2033                 snd_printk(KERN_ERR "usbaudio: unit %d not found!\n", unitid);
2034                 return -EINVAL;
2035         }
2036
2037         switch (p1[2]) {
2038         case UAC_INPUT_TERMINAL:
2039         case UAC2_CLOCK_SOURCE:
2040                 return 0; /* NOP */
2041         case UAC_MIXER_UNIT:
2042                 return parse_audio_mixer_unit(state, unitid, p1);
2043         case UAC_SELECTOR_UNIT:
2044         case UAC2_CLOCK_SELECTOR:
2045                 return parse_audio_selector_unit(state, unitid, p1);
2046         case UAC_FEATURE_UNIT:
2047                 return parse_audio_feature_unit(state, unitid, p1);
2048         case UAC1_PROCESSING_UNIT:
2049         /*   UAC2_EFFECT_UNIT has the same value */
2050                 if (state->mixer->protocol == UAC_VERSION_1)
2051                         return parse_audio_processing_unit(state, unitid, p1);
2052                 else
2053                         return 0; /* FIXME - effect units not implemented yet */
2054         case UAC1_EXTENSION_UNIT:
2055         /*   UAC2_PROCESSING_UNIT_V2 has the same value */
2056                 if (state->mixer->protocol == UAC_VERSION_1)
2057                         return parse_audio_extension_unit(state, unitid, p1);
2058                 else /* UAC_VERSION_2 */
2059                         return parse_audio_processing_unit(state, unitid, p1);
2060         case UAC2_EXTENSION_UNIT_V2:
2061                 return parse_audio_extension_unit(state, unitid, p1);
2062         default:
2063                 snd_printk(KERN_ERR "usbaudio: unit %u: unexpected type 0x%02x\n", unitid, p1[2]);
2064                 return -EINVAL;
2065         }
2066 }
2067
2068 static void snd_usb_mixer_free(struct usb_mixer_interface *mixer)
2069 {
2070         kfree(mixer->id_elems);
2071         if (mixer->urb) {
2072                 kfree(mixer->urb->transfer_buffer);
2073                 usb_free_urb(mixer->urb);
2074         }
2075         usb_free_urb(mixer->rc_urb);
2076         kfree(mixer->rc_setup_packet);
2077         kfree(mixer);
2078 }
2079
2080 static int snd_usb_mixer_dev_free(struct snd_device *device)
2081 {
2082         struct usb_mixer_interface *mixer = device->device_data;
2083         snd_usb_mixer_free(mixer);
2084         return 0;
2085 }
2086
2087 /*
2088  * create mixer controls
2089  *
2090  * walk through all UAC_OUTPUT_TERMINAL descriptors to search for mixers
2091  */
2092 static int snd_usb_mixer_controls(struct usb_mixer_interface *mixer)
2093 {
2094         struct mixer_build state;
2095         int err;
2096         const struct usbmix_ctl_map *map;
2097         void *p;
2098
2099         memset(&state, 0, sizeof(state));
2100         state.chip = mixer->chip;
2101         state.mixer = mixer;
2102         state.buffer = mixer->hostif->extra;
2103         state.buflen = mixer->hostif->extralen;
2104
2105         /* check the mapping table */
2106         for (map = usbmix_ctl_maps; map->id; map++) {
2107                 if (map->id == state.chip->usb_id) {
2108                         state.map = map->map;
2109                         state.selector_map = map->selector_map;
2110                         mixer->ignore_ctl_error = map->ignore_ctl_error;
2111                         break;
2112                 }
2113         }
2114
2115         p = NULL;
2116         while ((p = snd_usb_find_csint_desc(mixer->hostif->extra, mixer->hostif->extralen,
2117                                             p, UAC_OUTPUT_TERMINAL)) != NULL) {
2118                 if (mixer->protocol == UAC_VERSION_1) {
2119                         struct uac1_output_terminal_descriptor *desc = p;
2120
2121                         if (desc->bLength < sizeof(*desc))
2122                                 continue; /* invalid descriptor? */
2123                         set_bit(desc->bTerminalID, state.unitbitmap);  /* mark terminal ID as visited */
2124                         state.oterm.id = desc->bTerminalID;
2125                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
2126                         state.oterm.name = desc->iTerminal;
2127                         err = parse_audio_unit(&state, desc->bSourceID);
2128                         if (err < 0 && err != -EINVAL)
2129                                 return err;
2130                 } else { /* UAC_VERSION_2 */
2131                         struct uac2_output_terminal_descriptor *desc = p;
2132
2133                         if (desc->bLength < sizeof(*desc))
2134                                 continue; /* invalid descriptor? */
2135                         set_bit(desc->bTerminalID, state.unitbitmap);  /* mark terminal ID as visited */
2136                         state.oterm.id = desc->bTerminalID;
2137                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
2138                         state.oterm.name = desc->iTerminal;
2139                         err = parse_audio_unit(&state, desc->bSourceID);
2140                         if (err < 0 && err != -EINVAL)
2141                                 return err;
2142
2143                         /* for UAC2, use the same approach to also add the clock selectors */
2144                         err = parse_audio_unit(&state, desc->bCSourceID);
2145                         if (err < 0 && err != -EINVAL)
2146                                 return err;
2147                 }
2148         }
2149
2150         return 0;
2151 }
2152
2153 void snd_usb_mixer_notify_id(struct usb_mixer_interface *mixer, int unitid)
2154 {
2155         struct usb_mixer_elem_info *info;
2156
2157         for (info = mixer->id_elems[unitid]; info; info = info->next_id_elem)
2158                 snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
2159                                info->elem_id);
2160 }
2161
2162 static void snd_usb_mixer_dump_cval(struct snd_info_buffer *buffer,
2163                                     int unitid,
2164                                     struct usb_mixer_elem_info *cval)
2165 {
2166         static char *val_types[] = {"BOOLEAN", "INV_BOOLEAN",
2167                                     "S8", "U8", "S16", "U16"};
2168         snd_iprintf(buffer, "  Unit: %i\n", unitid);
2169         if (cval->elem_id)
2170                 snd_iprintf(buffer, "    Control: name=\"%s\", index=%i\n",
2171                                 cval->elem_id->name, cval->elem_id->index);
2172         snd_iprintf(buffer, "    Info: id=%i, control=%i, cmask=0x%x, "
2173                             "channels=%i, type=\"%s\"\n", cval->id,
2174                             cval->control, cval->cmask, cval->channels,
2175                             val_types[cval->val_type]);
2176         snd_iprintf(buffer, "    Volume: min=%i, max=%i, dBmin=%i, dBmax=%i\n",
2177                             cval->min, cval->max, cval->dBmin, cval->dBmax);
2178 }
2179
2180 static void snd_usb_mixer_proc_read(struct snd_info_entry *entry,
2181                                     struct snd_info_buffer *buffer)
2182 {
2183         struct snd_usb_audio *chip = entry->private_data;
2184         struct usb_mixer_interface *mixer;
2185         struct usb_mixer_elem_info *cval;
2186         int unitid;
2187
2188         list_for_each_entry(mixer, &chip->mixer_list, list) {
2189                 snd_iprintf(buffer,
2190                         "USB Mixer: usb_id=0x%08x, ctrlif=%i, ctlerr=%i\n",
2191                                 chip->usb_id, snd_usb_ctrl_intf(chip),
2192                                 mixer->ignore_ctl_error);
2193                 snd_iprintf(buffer, "Card: %s\n", chip->card->longname);
2194                 for (unitid = 0; unitid < MAX_ID_ELEMS; unitid++) {
2195                         for (cval = mixer->id_elems[unitid]; cval;
2196                                                 cval = cval->next_id_elem)
2197                                 snd_usb_mixer_dump_cval(buffer, unitid, cval);
2198                 }
2199         }
2200 }
2201
2202 static void snd_usb_mixer_interrupt_v2(struct usb_mixer_interface *mixer,
2203                                        int attribute, int value, int index)
2204 {
2205         struct usb_mixer_elem_info *info;
2206         __u8 unitid = (index >> 8) & 0xff;
2207         __u8 control = (value >> 8) & 0xff;
2208         __u8 channel = value & 0xff;
2209
2210         if (channel >= MAX_CHANNELS) {
2211                 snd_printk(KERN_DEBUG "%s(): bogus channel number %d\n",
2212                                 __func__, channel);
2213                 return;
2214         }
2215
2216         for (info = mixer->id_elems[unitid]; info; info = info->next_id_elem) {
2217                 if (info->control != control)
2218                         continue;
2219
2220                 switch (attribute) {
2221                 case UAC2_CS_CUR:
2222                         /* invalidate cache, so the value is read from the device */
2223                         if (channel)
2224                                 info->cached &= ~(1 << channel);
2225                         else /* master channel */
2226                                 info->cached = 0;
2227
2228                         snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
2229                                         info->elem_id);
2230                         break;
2231
2232                 case UAC2_CS_RANGE:
2233                         /* TODO */
2234                         break;
2235
2236                 case UAC2_CS_MEM:
2237                         /* TODO */
2238                         break;
2239
2240                 default:
2241                         snd_printk(KERN_DEBUG "unknown attribute %d in interrupt\n",
2242                                                 attribute);
2243                         break;
2244                 } /* switch */
2245         }
2246 }
2247
2248 static void snd_usb_mixer_interrupt(struct urb *urb)
2249 {
2250         struct usb_mixer_interface *mixer = urb->context;
2251         int len = urb->actual_length;
2252         int ustatus = urb->status;
2253
2254         if (ustatus != 0)
2255                 goto requeue;
2256
2257         if (mixer->protocol == UAC_VERSION_1) {
2258                 struct uac1_status_word *status;
2259
2260                 for (status = urb->transfer_buffer;
2261                      len >= sizeof(*status);
2262                      len -= sizeof(*status), status++) {
2263                         snd_printd(KERN_DEBUG "status interrupt: %02x %02x\n",
2264                                                 status->bStatusType,
2265                                                 status->bOriginator);
2266
2267                         /* ignore any notifications not from the control interface */
2268                         if ((status->bStatusType & UAC1_STATUS_TYPE_ORIG_MASK) !=
2269                                 UAC1_STATUS_TYPE_ORIG_AUDIO_CONTROL_IF)
2270                                 continue;
2271
2272                         if (status->bStatusType & UAC1_STATUS_TYPE_MEM_CHANGED)
2273                                 snd_usb_mixer_rc_memory_change(mixer, status->bOriginator);
2274                         else
2275                                 snd_usb_mixer_notify_id(mixer, status->bOriginator);
2276                 }
2277         } else { /* UAC_VERSION_2 */
2278                 struct uac2_interrupt_data_msg *msg;
2279
2280                 for (msg = urb->transfer_buffer;
2281                      len >= sizeof(*msg);
2282                      len -= sizeof(*msg), msg++) {
2283                         /* drop vendor specific and endpoint requests */
2284                         if ((msg->bInfo & UAC2_INTERRUPT_DATA_MSG_VENDOR) ||
2285                             (msg->bInfo & UAC2_INTERRUPT_DATA_MSG_EP))
2286                                 continue;
2287
2288                         snd_usb_mixer_interrupt_v2(mixer, msg->bAttribute,
2289                                                    le16_to_cpu(msg->wValue),
2290                                                    le16_to_cpu(msg->wIndex));
2291                 }
2292         }
2293
2294 requeue:
2295         if (ustatus != -ENOENT && ustatus != -ECONNRESET && ustatus != -ESHUTDOWN) {
2296                 urb->dev = mixer->chip->dev;
2297                 usb_submit_urb(urb, GFP_ATOMIC);
2298         }
2299 }
2300
2301 /* stop any bus activity of a mixer */
2302 void snd_usb_mixer_inactivate(struct usb_mixer_interface *mixer)
2303 {
2304         usb_kill_urb(mixer->urb);
2305         usb_kill_urb(mixer->rc_urb);
2306 }
2307
2308 int snd_usb_mixer_activate(struct usb_mixer_interface *mixer)
2309 {
2310         int err;
2311
2312         if (mixer->urb) {
2313                 err = usb_submit_urb(mixer->urb, GFP_NOIO);
2314                 if (err < 0)
2315                         return err;
2316         }
2317
2318         return 0;
2319 }
2320
2321 /* create the handler for the optional status interrupt endpoint */
2322 static int snd_usb_mixer_status_create(struct usb_mixer_interface *mixer)
2323 {
2324         struct usb_endpoint_descriptor *ep;
2325         void *transfer_buffer;
2326         int buffer_length;
2327         unsigned int epnum;
2328
2329         /* we need one interrupt input endpoint */
2330         if (get_iface_desc(mixer->hostif)->bNumEndpoints < 1)
2331                 return 0;
2332         ep = get_endpoint(mixer->hostif, 0);
2333         if (!usb_endpoint_dir_in(ep) || !usb_endpoint_xfer_int(ep))
2334                 return 0;
2335
2336         epnum = usb_endpoint_num(ep);
2337         buffer_length = le16_to_cpu(ep->wMaxPacketSize);
2338         transfer_buffer = kmalloc(buffer_length, GFP_KERNEL);
2339         if (!transfer_buffer)
2340                 return -ENOMEM;
2341         mixer->urb = usb_alloc_urb(0, GFP_KERNEL);
2342         if (!mixer->urb) {
2343                 kfree(transfer_buffer);
2344                 return -ENOMEM;
2345         }
2346         usb_fill_int_urb(mixer->urb, mixer->chip->dev,
2347                          usb_rcvintpipe(mixer->chip->dev, epnum),
2348                          transfer_buffer, buffer_length,
2349                          snd_usb_mixer_interrupt, mixer, ep->bInterval);
2350         usb_submit_urb(mixer->urb, GFP_KERNEL);
2351         return 0;
2352 }
2353
2354 int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif,
2355                          int ignore_error)
2356 {
2357         static struct snd_device_ops dev_ops = {
2358                 .dev_free = snd_usb_mixer_dev_free
2359         };
2360         struct usb_mixer_interface *mixer;
2361         struct snd_info_entry *entry;
2362         int err;
2363
2364         strcpy(chip->card->mixername, "USB Mixer");
2365
2366         mixer = kzalloc(sizeof(*mixer), GFP_KERNEL);
2367         if (!mixer)
2368                 return -ENOMEM;
2369         mixer->chip = chip;
2370         mixer->ignore_ctl_error = ignore_error;
2371         mixer->id_elems = kcalloc(MAX_ID_ELEMS, sizeof(*mixer->id_elems),
2372                                   GFP_KERNEL);
2373         if (!mixer->id_elems) {
2374                 kfree(mixer);
2375                 return -ENOMEM;
2376         }
2377
2378         mixer->hostif = &usb_ifnum_to_if(chip->dev, ctrlif)->altsetting[0];
2379         switch (get_iface_desc(mixer->hostif)->bInterfaceProtocol) {
2380         case UAC_VERSION_1:
2381         default:
2382                 mixer->protocol = UAC_VERSION_1;
2383                 break;
2384         case UAC_VERSION_2:
2385                 mixer->protocol = UAC_VERSION_2;
2386                 break;
2387         }
2388
2389         if ((err = snd_usb_mixer_controls(mixer)) < 0 ||
2390             (err = snd_usb_mixer_status_create(mixer)) < 0)
2391                 goto _error;
2392
2393         snd_usb_mixer_apply_create_quirk(mixer);
2394
2395         err = snd_device_new(chip->card, SNDRV_DEV_LOWLEVEL, mixer, &dev_ops);
2396         if (err < 0)
2397                 goto _error;
2398
2399         if (list_empty(&chip->mixer_list) &&
2400             !snd_card_proc_new(chip->card, "usbmixer", &entry))
2401                 snd_info_set_text_ops(entry, chip, snd_usb_mixer_proc_read);
2402
2403         list_add(&mixer->list, &chip->mixer_list);
2404         return 0;
2405
2406 _error:
2407         snd_usb_mixer_free(mixer);
2408         return err;
2409 }
2410
2411 void snd_usb_mixer_disconnect(struct list_head *p)
2412 {
2413         struct usb_mixer_interface *mixer;
2414
2415         mixer = list_entry(p, struct usb_mixer_interface, list);
2416         usb_kill_urb(mixer->urb);
2417         usb_kill_urb(mixer->rc_urb);
2418 }