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         return (cval->mixer->protocol == UAC_VERSION_1) ?
 386                 get_ctl_value_v1(cval, request, validx, value_ret) :
 387                 get_ctl_value_v2(cval, request, validx, value_ret);
 388 }
 389
 390 static int get_cur_ctl_value(struct usb_mixer_elem_info *cval, int validx, int *value)
 391 {
 392         return get_ctl_value(cval, UAC_GET_CUR, validx, value);
 393 }
 394
 395 /* channel = 0: master, 1 = first channel */
 396 static inline int get_cur_mix_raw(struct usb_mixer_elem_info *cval,
 397                                   int channel, int *value)
 398 {
 399         return get_ctl_value(cval, UAC_GET_CUR, (cval->control << 8) | channel, value);
 400 }
 401
 402 static int get_cur_mix_value(struct usb_mixer_elem_info *cval,
 403                              int channel, int index, int *value)
 404 {
 405         int err;
 406
 407         if (cval->cached & (1 << channel)) {
 408                 *value = cval->cache_val[index];
 409                 return 0;
 410         }
 411         err = get_cur_mix_raw(cval, channel, value);
 412         if (err < 0) {
 413                 if (!cval->mixer->ignore_ctl_error)
 414                         snd_printd(KERN_ERR "cannot get current value for control %d ch %d: err = %d\n",
 415                                    cval->control, channel, err);
 416                 return err;
 417         }
 418         cval->cached |= 1 << channel;
 419         cval->cache_val[index] = *value;
 420         return 0;
 421 }
 422
 423
 424 /*
 425  * set a mixer value
 426  */
 427
 428 int snd_usb_mixer_set_ctl_value(struct usb_mixer_elem_info *cval,
 429                                 int request, int validx, int value_set)
 430 {
 431         struct snd_usb_audio *chip = cval->mixer->chip;
 432         unsigned char buf[2];
 433         int idx = 0, val_len, err, timeout = 10;
 434
 435         if (cval->mixer->protocol == UAC_VERSION_1) {
 436                 val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
 437         } else { /* UAC_VERSION_2 */
 438                 /* audio class v2 controls are always 2 bytes in size */
 439                 val_len = sizeof(__u16);
 440
 441                 /* FIXME */
 442                 if (request != UAC_SET_CUR) {
 443                         snd_printdd(KERN_WARNING "RANGE setting not yet supported\n");
 444                         return -EINVAL;
 445                 }
 446
 447                 request = UAC2_CS_CUR;
 448         }
 449
 450         value_set = convert_bytes_value(cval, value_set);
 451         buf[0] = value_set & 0xff;
 452         buf[1] = (value_set >> 8) & 0xff;
 453         err = snd_usb_autoresume(chip);
 454         if (err < 0)
 455                 return -EIO;
 456         down_read(&chip->shutdown_rwsem);
 457         while (timeout-- > 0) {
 458                 if (chip->shutdown)
 459                         break;
 460                 idx = snd_usb_ctrl_intf(chip) | (cval->id << 8);
 461                 if (snd_usb_ctl_msg(chip->dev,
 462                                     usb_sndctrlpipe(chip->dev, 0), request,
 463                                     USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
 464                                     validx, idx, buf, val_len) >= 0) {
 465                         err = 0;
 466                         goto out;
 467                 }
 468         }
 469         snd_printdd(KERN_ERR "cannot set ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d, data = %#x/%#x\n",
 470                     request, validx, idx, cval->val_type, buf[0], buf[1]);
 471         err = -EINVAL;
 472
 473  out:
 474         up_read(&chip->shutdown_rwsem);
 475         snd_usb_autosuspend(chip);
 476         return err;
 477 }
 478
 479 static int set_cur_ctl_value(struct usb_mixer_elem_info *cval, int validx, int value)
 480 {
 481         return snd_usb_mixer_set_ctl_value(cval, UAC_SET_CUR, validx, value);
 482 }
 483
 484 static int set_cur_mix_value(struct usb_mixer_elem_info *cval, int channel,
 485                              int index, int value)
 486 {
 487         int err;
 488         unsigned int read_only = (channel == 0) ?
 489                 cval->master_readonly :
 490                 cval->ch_readonly & (1 << (channel - 1));
 491
 492         if (read_only) {
 493                 snd_printdd(KERN_INFO "%s(): channel %d of control %d is read_only\n",
 494                             __func__, channel, cval->control);
 495                 return 0;
 496         }
 497
 498         err = snd_usb_mixer_set_ctl_value(cval, UAC_SET_CUR, (cval->control << 8) | channel,
 499                             value);
 500         if (err < 0)
 501                 return err;
 502         cval->cached |= 1 << channel;
 503         cval->cache_val[index] = value;
 504         return 0;
 505 }
 506
 507 /*
 508  * TLV callback for mixer volume controls
 509  */
 510 static int mixer_vol_tlv(struct snd_kcontrol *kcontrol, int op_flag,
 511                          unsigned int size, unsigned int __user *_tlv)
 512 {
 513         struct usb_mixer_elem_info *cval = kcontrol->private_data;
 514         DECLARE_TLV_DB_MINMAX(scale, 0, 0);
 515
 516         if (size < sizeof(scale))
 517                 return -ENOMEM;
 518         scale[2] = cval->dBmin;
 519         scale[3] = cval->dBmax;
 520         if (copy_to_user(_tlv, scale, sizeof(scale)))
 521                 return -EFAULT;
 522         return 0;
 523 }
 524
 525 /*
 526  * parser routines begin here...
 527  */
 528
 529 static int parse_audio_unit(struct mixer_build *state, int unitid);
 530
 531
 532 /*
 533  * check if the input/output channel routing is enabled on the given bitmap.
 534  * used for mixer unit parser
 535  */
 536 static int check_matrix_bitmap(unsigned char *bmap, int ich, int och, int num_outs)
 537 {
 538         int idx = ich * num_outs + och;
 539         return bmap[idx >> 3] & (0x80 >> (idx & 7));
 540 }
 541
 542
 543 /*
 544  * add an alsa control element
 545  * search and increment the index until an empty slot is found.
 546  *
 547  * if failed, give up and free the control instance.
 548  */
 549
 550 int snd_usb_mixer_add_control(struct usb_mixer_interface *mixer,
 551                               struct snd_kcontrol *kctl)
 552 {
 553         struct usb_mixer_elem_info *cval = kctl->private_data;
 554         int err;
 555
 556         while (snd_ctl_find_id(mixer->chip->card, &kctl->id))
 557                 kctl->id.index++;
 558         if ((err = snd_ctl_add(mixer->chip->card, kctl)) < 0) {
 559                 snd_printd(KERN_ERR "cannot add control (err = %d)\n", err);
 560                 return err;
 561         }
 562         cval->elem_id = &kctl->id;
 563         cval->next_id_elem = mixer->id_elems[cval->id];
 564         mixer->id_elems[cval->id] = cval;
 565         return 0;
 566 }
 567
 568
 569 /*
 570  * get a terminal name string
 571  */
 572
 573 static struct iterm_name_combo {
 574         int type;
 575         char *name;
 576 } iterm_names[] = {
 577         { 0x0300, "Output" },
 578         { 0x0301, "Speaker" },
 579         { 0x0302, "Headphone" },
 580         { 0x0303, "HMD Audio" },
 581         { 0x0304, "Desktop Speaker" },
 582         { 0x0305, "Room Speaker" },
 583         { 0x0306, "Com Speaker" },
 584         { 0x0307, "LFE" },
 585         { 0x0600, "External In" },
 586         { 0x0601, "Analog In" },
 587         { 0x0602, "Digital In" },
 588         { 0x0603, "Line" },
 589         { 0x0604, "Legacy In" },
 590         { 0x0605, "IEC958 In" },
 591         { 0x0606, "1394 DA Stream" },
 592         { 0x0607, "1394 DV Stream" },
 593         { 0x0700, "Embedded" },
 594         { 0x0701, "Noise Source" },
 595         { 0x0702, "Equalization Noise" },
 596         { 0x0703, "CD" },
 597         { 0x0704, "DAT" },
 598         { 0x0705, "DCC" },
 599         { 0x0706, "MiniDisk" },
 600         { 0x0707, "Analog Tape" },
 601         { 0x0708, "Phonograph" },
 602         { 0x0709, "VCR Audio" },
 603         { 0x070a, "Video Disk Audio" },
 604         { 0x070b, "DVD Audio" },
 605         { 0x070c, "TV Tuner Audio" },
 606         { 0x070d, "Satellite Rec Audio" },
 607         { 0x070e, "Cable Tuner Audio" },
 608         { 0x070f, "DSS Audio" },
 609         { 0x0710, "Radio Receiver" },
 610         { 0x0711, "Radio Transmitter" },
 611         { 0x0712, "Multi-Track Recorder" },
 612         { 0x0713, "Synthesizer" },
 613         { 0 },
 614 };
 615
 616 static int get_term_name(struct mixer_build *state, struct usb_audio_term *iterm,
 617                          unsigned char *name, int maxlen, int term_only)
 618 {
 619         struct iterm_name_combo *names;
 620
 621         if (iterm->name)
 622                 return snd_usb_copy_string_desc(state, iterm->name, name, maxlen);
 623
 624         /* virtual type - not a real terminal */
 625         if (iterm->type >> 16) {
 626                 if (term_only)
 627                         return 0;
 628                 switch (iterm->type >> 16) {
 629                 case UAC_SELECTOR_UNIT:
 630                         strcpy(name, "Selector"); return 8;
 631                 case UAC1_PROCESSING_UNIT:
 632                         strcpy(name, "Process Unit"); return 12;
 633                 case UAC1_EXTENSION_UNIT:
 634                         strcpy(name, "Ext Unit"); return 8;
 635                 case UAC_MIXER_UNIT:
 636                         strcpy(name, "Mixer"); return 5;
 637                 default:
 638                         return sprintf(name, "Unit %d", iterm->id);
 639                 }
 640         }
 641
 642         switch (iterm->type & 0xff00) {
 643         case 0x0100:
 644                 strcpy(name, "PCM"); return 3;
 645         case 0x0200:
 646                 strcpy(name, "Mic"); return 3;
 647         case 0x0400:
 648                 strcpy(name, "Headset"); return 7;
 649         case 0x0500:
 650                 strcpy(name, "Phone"); return 5;
 651         }
 652
 653         for (names = iterm_names; names->type; names++)
 654                 if (names->type == iterm->type) {
 655                         strcpy(name, names->name);
 656                         return strlen(names->name);
 657                 }
 658         return 0;
 659 }
 660
 661
 662 /*
 663  * parse the source unit recursively until it reaches to a terminal
 664  * or a branched unit.
 665  */
 666 static int check_input_term(struct mixer_build *state, int id, struct usb_audio_term *term)
 667 {
 668         int err;
 669         void *p1;
 670
 671         memset(term, 0, sizeof(*term));
 672         while ((p1 = find_audio_control_unit(state, id)) != NULL) {
 673                 unsigned char *hdr = p1;
 674                 term->id = id;
 675                 switch (hdr[2]) {
 676                 case UAC_INPUT_TERMINAL:
 677                         if (state->mixer->protocol == UAC_VERSION_1) {
 678                                 struct uac_input_terminal_descriptor *d = p1;
 679                                 term->type = le16_to_cpu(d->wTerminalType);
 680                                 term->channels = d->bNrChannels;
 681                                 term->chconfig = le16_to_cpu(d->wChannelConfig);
 682                                 term->name = d->iTerminal;
 683                         } else { /* UAC_VERSION_2 */
 684                                 struct uac2_input_terminal_descriptor *d = p1;
 685                                 term->type = le16_to_cpu(d->wTerminalType);
 686                                 term->channels = d->bNrChannels;
 687                                 term->chconfig = le32_to_cpu(d->bmChannelConfig);
 688                                 term->name = d->iTerminal;
 689
 690                                 /* call recursively to get the clock selectors */
 691                                 err = check_input_term(state, d->bCSourceID, term);
 692                                 if (err < 0)
 693                                         return err;
 694                         }
 695                         return 0;
 696                 case UAC_FEATURE_UNIT: {
 697                         /* the header is the same for v1 and v2 */
 698                         struct uac_feature_unit_descriptor *d = p1;
 699                         id = d->bSourceID;
 700                         break; /* continue to parse */
 701                 }
 702                 case UAC_MIXER_UNIT: {
 703                         struct uac_mixer_unit_descriptor *d = p1;
 704                         term->type = d->bDescriptorSubtype << 16; /* virtual type */
 705                         term->channels = uac_mixer_unit_bNrChannels(d);
 706                         term->chconfig = uac_mixer_unit_wChannelConfig(d, state->mixer->protocol);
 707                         term->name = uac_mixer_unit_iMixer(d);
 708                         return 0;
 709                 }
 710                 case UAC_SELECTOR_UNIT:
 711                 case UAC2_CLOCK_SELECTOR: {
 712                         struct uac_selector_unit_descriptor *d = p1;
 713                         /* call recursively to retrieve the channel info */
 714                         err = check_input_term(state, d->baSourceID[0], term);
 715                         if (err < 0)
 716                                 return err;
 717                         term->type = d->bDescriptorSubtype << 16; /* virtual type */
 718                         term->id = id;
 719                         term->name = uac_selector_unit_iSelector(d);
 720                         return 0;
 721                 }
 722                 case UAC1_PROCESSING_UNIT:
 723                 case UAC1_EXTENSION_UNIT:
 724                 /* UAC2_PROCESSING_UNIT_V2 */
 725                 /* UAC2_EFFECT_UNIT */
 726                 case UAC2_EXTENSION_UNIT_V2: {
 727                         struct uac_processing_unit_descriptor *d = p1;
 728
 729                         if (state->mixer->protocol == UAC_VERSION_2 &&
 730                                 hdr[2] == UAC2_EFFECT_UNIT) {
 731                                 /* UAC2/UAC1 unit IDs overlap here in an
 732                                  * uncompatible way. Ignore this unit for now.
 733                                  */
 734                                 return 0;
 735                         }
 736
 737                         if (d->bNrInPins) {
 738                                 id = d->baSourceID[0];
 739                                 break; /* continue to parse */
 740                         }
 741                         term->type = d->bDescriptorSubtype << 16; /* virtual type */
 742                         term->channels = uac_processing_unit_bNrChannels(d);
 743                         term->chconfig = uac_processing_unit_wChannelConfig(d, state->mixer->protocol);
 744                         term->name = uac_processing_unit_iProcessing(d, state->mixer->protocol);
 745                         return 0;
 746                 }
 747                 case UAC2_CLOCK_SOURCE: {
 748                         struct uac_clock_source_descriptor *d = p1;
 749                         term->type = d->bDescriptorSubtype << 16; /* virtual type */
 750                         term->id = id;
 751                         term->name = d->iClockSource;
 752                         return 0;
 753                 }
 754                 default:
 755                         return -ENODEV;
 756                 }
 757         }
 758         return -ENODEV;
 759 }
 760
 761
 762 /*
 763  * Feature Unit
 764  */
 765
 766 /* feature unit control information */
 767 struct usb_feature_control_info {
 768         const char *name;
 769         unsigned int type;      /* control type (mute, volume, etc.) */
 770 };
 771
 772 static struct usb_feature_control_info audio_feature_info[] = {
 773         { "Mute",                       USB_MIXER_INV_BOOLEAN },
 774         { "Volume",                     USB_MIXER_S16 },
 775         { "Tone Control - Bass",        USB_MIXER_S8 },
 776         { "Tone Control - Mid",         USB_MIXER_S8 },
 777         { "Tone Control - Treble",      USB_MIXER_S8 },
 778         { "Graphic Equalizer",          USB_MIXER_S8 }, /* FIXME: not implemeted yet */
 779         { "Auto Gain Control",          USB_MIXER_BOOLEAN },
 780         { "Delay Control",              USB_MIXER_U16 },
 781         { "Bass Boost",                 USB_MIXER_BOOLEAN },
 782         { "Loudness",                   USB_MIXER_BOOLEAN },
 783         /* UAC2 specific */
 784         { "Input Gain Control",         USB_MIXER_U16 },
 785         { "Input Gain Pad Control",     USB_MIXER_BOOLEAN },
 786         { "Phase Inverter Control",     USB_MIXER_BOOLEAN },
 787 };
 788
 789
 790 /* private_free callback */
 791 static void usb_mixer_elem_free(struct snd_kcontrol *kctl)
 792 {
 793         kfree(kctl->private_data);
 794         kctl->private_data = NULL;
 795 }
 796
 797
 798 /*
 799  * interface to ALSA control for feature/mixer units
 800  */
 801
 802 /* volume control quirks */
 803 static void volume_control_quirks(struct usb_mixer_elem_info *cval,
 804                                   struct snd_kcontrol *kctl)
 805 {
 806         switch (cval->mixer->chip->usb_id) {
 807         case USB_ID(0x0471, 0x0101):
 808         case USB_ID(0x0471, 0x0104):
 809         case USB_ID(0x0471, 0x0105):
 810         case USB_ID(0x0672, 0x1041):
 811         /* quirk for UDA1321/N101.
 812          * note that detection between firmware 2.1.1.7 (N101)
 813          * and later 2.1.1.21 is not very clear from datasheets.
 814          * I hope that the min value is -15360 for newer firmware --jk
 815          */
 816                 if (!strcmp(kctl->id.name, "PCM Playback Volume") &&
 817                     cval->min == -15616) {
 818                         snd_printk(KERN_INFO
 819                                  "set volume quirk for UDA1321/N101 chip\n");
 820                         cval->max = -256;
 821                 }
 822                 break;
 823
 824         case USB_ID(0x046d, 0x09a4):
 825                 if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
 826                         snd_printk(KERN_INFO
 827                                 "set volume quirk for QuickCam E3500\n");
 828                         cval->min = 6080;
 829                         cval->max = 8768;
 830                         cval->res = 192;
 831                 }
 832                 break;
 833
 834         case USB_ID(0x046d, 0x0807): /* Logitech Webcam C500 */
 835         case USB_ID(0x046d, 0x0808):
 836         case USB_ID(0x046d, 0x0809):
 837         case USB_ID(0x046d, 0x0819): /* Logitech Webcam C210 */
 838         case USB_ID(0x046d, 0x081b): /* HD Webcam c310 */
 839         case USB_ID(0x046d, 0x081d): /* HD Webcam c510 */
 840         case USB_ID(0x046d, 0x0825): /* HD Webcam c270 */
 841         case USB_ID(0x046d, 0x0826): /* HD Webcam c525 */
 842         case USB_ID(0x046d, 0x08ca): /* Logitech Quickcam Fusion */
 843         case USB_ID(0x046d, 0x0991):
 844         /* Most audio usb devices lie about volume resolution.
 845          * Most Logitech webcams have res = 384.
 846          * Proboly there is some logitech magic behind this number --fishor
 847          */
 848                 if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
 849                         snd_printk(KERN_INFO
 850                                 "set resolution quirk: cval->res = 384\n");
 851                         cval->res = 384;
 852                 }
 853                 break;
 854
 855         }
 856 }
 857
 858 /*
 859  * retrieve the minimum and maximum values for the specified control
 860  */
 861 static int get_min_max_with_quirks(struct usb_mixer_elem_info *cval,
 862                                    int default_min, struct snd_kcontrol *kctl)
 863 {
 864         /* for failsafe */
 865         cval->min = default_min;
 866         cval->max = cval->min + 1;
 867         cval->res = 1;
 868         cval->dBmin = cval->dBmax = 0;
 869
 870         if (cval->val_type == USB_MIXER_BOOLEAN ||
 871             cval->val_type == USB_MIXER_INV_BOOLEAN) {
 872                 cval->initialized = 1;
 873         } else {
 874                 int minchn = 0;
 875                 if (cval->cmask) {
 876                         int i;
 877                         for (i = 0; i < MAX_CHANNELS; i++)
 878                                 if (cval->cmask & (1 << i)) {
 879                                         minchn = i + 1;
 880                                         break;
 881                                 }
 882                 }
 883                 if (get_ctl_value(cval, UAC_GET_MAX, (cval->control << 8) | minchn, &cval->max) < 0 ||
 884                     get_ctl_value(cval, UAC_GET_MIN, (cval->control << 8) | minchn, &cval->min) < 0) {
 885                         snd_printd(KERN_ERR "%d:%d: cannot get min/max values for control %d (id %d)\n",
 886                                    cval->id, snd_usb_ctrl_intf(cval->mixer->chip), cval->control, cval->id);
 887                         return -EINVAL;
 888                 }
 889                 if (get_ctl_value(cval, UAC_GET_RES, (cval->control << 8) | minchn, &cval->res) < 0) {
 890                         cval->res = 1;
 891                 } else {
 892                         int last_valid_res = cval->res;
 893
 894                         while (cval->res > 1) {
 895                                 if (snd_usb_mixer_set_ctl_value(cval, UAC_SET_RES,
 896                                                                 (cval->control << 8) | minchn, cval->res / 2) < 0)
 897                                         break;
 898                                 cval->res /= 2;
 899                         }
 900                         if (get_ctl_value(cval, UAC_GET_RES, (cval->control << 8) | minchn, &cval->res) < 0)
 901                                 cval->res = last_valid_res;
 902                 }
 903                 if (cval->res == 0)
 904                         cval->res = 1;
 905
 906                 /* Additional checks for the proper resolution
 907                  *
 908                  * Some devices report smaller resolutions than actually
 909                  * reacting.  They don't return errors but simply clip
 910                  * to the lower aligned value.
 911                  */
 912                 if (cval->min + cval->res < cval->max) {
 913                         int last_valid_res = cval->res;
 914                         int saved, test, check;
 915                         get_cur_mix_raw(cval, minchn, &saved);
 916                         for (;;) {
 917                                 test = saved;
 918                                 if (test < cval->max)
 919                                         test += cval->res;
 920                                 else
 921                                         test -= cval->res;
 922                                 if (test < cval->min || test > cval->max ||
 923                                     set_cur_mix_value(cval, minchn, 0, test) ||
 924                                     get_cur_mix_raw(cval, minchn, &check)) {
 925                                         cval->res = last_valid_res;
 926                                         break;
 927                                 }
 928                                 if (test == check)
 929                                         break;
 930                                 cval->res *= 2;
 931                         }
 932                         set_cur_mix_value(cval, minchn, 0, saved);
 933                 }
 934
 935                 cval->initialized = 1;
 936         }
 937
 938         if (kctl)
 939                 volume_control_quirks(cval, kctl);
 940
 941         /* USB descriptions contain the dB scale in 1/256 dB unit
 942          * while ALSA TLV contains in 1/100 dB unit
 943          */
 944         cval->dBmin = (convert_signed_value(cval, cval->min) * 100) / 256;
 945         cval->dBmax = (convert_signed_value(cval, cval->max) * 100) / 256;
 946         if (cval->dBmin > cval->dBmax) {
 947                 /* something is wrong; assume it's either from/to 0dB */
 948                 if (cval->dBmin < 0)
 949                         cval->dBmax = 0;
 950                 else if (cval->dBmin > 0)
 951                         cval->dBmin = 0;
 952                 if (cval->dBmin > cval->dBmax) {
 953                         /* totally crap, return an error */
 954                         return -EINVAL;
 955                 }
 956         }
 957
 958         return 0;
 959 }
 960
 961 #define get_min_max(cval, def)  get_min_max_with_quirks(cval, def, NULL)
 962
 963 /* get a feature/mixer unit info */
 964 static int mixer_ctl_feature_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
 965 {
 966         struct usb_mixer_elem_info *cval = kcontrol->private_data;
 967
 968         if (cval->val_type == USB_MIXER_BOOLEAN ||
 969             cval->val_type == USB_MIXER_INV_BOOLEAN)
 970                 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
 971         else
 972                 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 973         uinfo->count = cval->channels;
 974         if (cval->val_type == USB_MIXER_BOOLEAN ||
 975             cval->val_type == USB_MIXER_INV_BOOLEAN) {
 976                 uinfo->value.integer.min = 0;
 977                 uinfo->value.integer.max = 1;
 978         } else {
 979                 if (!cval->initialized) {
 980                         get_min_max_with_quirks(cval, 0, kcontrol);
 981                         if (cval->initialized && cval->dBmin >= cval->dBmax) {
 982                                 kcontrol->vd[0].access &=
 983                                         ~(SNDRV_CTL_ELEM_ACCESS_TLV_READ |
 984                                           SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK);
 985                                 snd_ctl_notify(cval->mixer->chip->card,
 986                                                SNDRV_CTL_EVENT_MASK_INFO,
 987                                                &kcontrol->id);
 988                         }
 989                 }
 990                 uinfo->value.integer.min = 0;
 991                 uinfo->value.integer.max =
 992                         (cval->max - cval->min + cval->res - 1) / cval->res;
 993         }
 994         return 0;
 995 }
 996
 997 /* get the current value from feature/mixer unit */
 998 static int mixer_ctl_feature_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
 999 {
1000         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1001         int c, cnt, val, err;
1002
1003         ucontrol->value.integer.value[0] = cval->min;
1004         if (cval->cmask) {
1005                 cnt = 0;
1006                 for (c = 0; c < MAX_CHANNELS; c++) {
1007                         if (!(cval->cmask & (1 << c)))
1008                                 continue;
1009                         err = get_cur_mix_value(cval, c + 1, cnt, &val);
1010                         if (err < 0)
1011                                 return cval->mixer->ignore_ctl_error ? 0 : err;
1012                         val = get_relative_value(cval, val);
1013                         ucontrol->value.integer.value[cnt] = val;
1014                         cnt++;
1015                 }
1016                 return 0;
1017         } else {
1018                 /* master channel */
1019                 err = get_cur_mix_value(cval, 0, 0, &val);
1020                 if (err < 0)
1021                         return cval->mixer->ignore_ctl_error ? 0 : err;
1022                 val = get_relative_value(cval, val);
1023                 ucontrol->value.integer.value[0] = val;
1024         }
1025         return 0;
1026 }
1027
1028 /* put the current value to feature/mixer unit */
1029 static int mixer_ctl_feature_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1030 {
1031         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1032         int c, cnt, val, oval, err;
1033         int changed = 0;
1034
1035         if (cval->cmask) {
1036                 cnt = 0;
1037                 for (c = 0; c < MAX_CHANNELS; c++) {
1038                         if (!(cval->cmask & (1 << c)))
1039                                 continue;
1040                         err = get_cur_mix_value(cval, c + 1, cnt, &oval);
1041                         if (err < 0)
1042                                 return cval->mixer->ignore_ctl_error ? 0 : err;
1043                         val = ucontrol->value.integer.value[cnt];
1044                         val = get_abs_value(cval, val);
1045                         if (oval != val) {
1046                                 set_cur_mix_value(cval, c + 1, cnt, val);
1047                                 changed = 1;
1048                         }
1049                         cnt++;
1050                 }
1051         } else {
1052                 /* master channel */
1053                 err = get_cur_mix_value(cval, 0, 0, &oval);
1054                 if (err < 0)
1055                         return cval->mixer->ignore_ctl_error ? 0 : err;
1056                 val = ucontrol->value.integer.value[0];
1057                 val = get_abs_value(cval, val);
1058                 if (val != oval) {
1059                         set_cur_mix_value(cval, 0, 0, val);
1060                         changed = 1;
1061                 }
1062         }
1063         return changed;
1064 }
1065
1066 static struct snd_kcontrol_new usb_feature_unit_ctl = {
1067         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1068         .name = "", /* will be filled later manually */
1069         .info = mixer_ctl_feature_info,
1070         .get = mixer_ctl_feature_get,
1071         .put = mixer_ctl_feature_put,
1072 };
1073
1074 /* the read-only variant */
1075 static struct snd_kcontrol_new usb_feature_unit_ctl_ro = {
1076         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1077         .name = "", /* will be filled later manually */
1078         .info = mixer_ctl_feature_info,
1079         .get = mixer_ctl_feature_get,
1080         .put = NULL,
1081 };
1082
1083 /* This symbol is exported in order to allow the mixer quirks to
1084  * hook up to the standard feature unit control mechanism */
1085 struct snd_kcontrol_new *snd_usb_feature_unit_ctl = &usb_feature_unit_ctl;
1086
1087 /*
1088  * build a feature control
1089  */
1090
1091 static size_t append_ctl_name(struct snd_kcontrol *kctl, const char *str)
1092 {
1093         return strlcat(kctl->id.name, str, sizeof(kctl->id.name));
1094 }
1095
1096 static void build_feature_ctl(struct mixer_build *state, void *raw_desc,
1097                               unsigned int ctl_mask, int control,
1098                               struct usb_audio_term *iterm, int unitid,
1099                               int readonly_mask)
1100 {
1101         struct uac_feature_unit_descriptor *desc = raw_desc;
1102         unsigned int len = 0;
1103         int mapped_name = 0;
1104         int nameid = uac_feature_unit_iFeature(desc);
1105         struct snd_kcontrol *kctl;
1106         struct usb_mixer_elem_info *cval;
1107         const struct usbmix_name_map *map;
1108         unsigned int range;
1109
1110         control++; /* change from zero-based to 1-based value */
1111
1112         if (control == UAC_FU_GRAPHIC_EQUALIZER) {
1113                 /* FIXME: not supported yet */
1114                 return;
1115         }
1116
1117         map = find_map(state, unitid, control);
1118         if (check_ignored_ctl(map))
1119                 return;
1120
1121         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1122         if (! cval) {
1123                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1124                 return;
1125         }
1126         cval->mixer = state->mixer;
1127         cval->id = unitid;
1128         cval->control = control;
1129         cval->cmask = ctl_mask;
1130         cval->val_type = audio_feature_info[control-1].type;
1131         if (ctl_mask == 0) {
1132                 cval->channels = 1;     /* master channel */
1133                 cval->master_readonly = readonly_mask;
1134         } else {
1135                 int i, c = 0;
1136                 for (i = 0; i < 16; i++)
1137                         if (ctl_mask & (1 << i))
1138                                 c++;
1139                 cval->channels = c;
1140                 cval->ch_readonly = readonly_mask;
1141         }
1142
1143         /* if all channels in the mask are marked read-only, make the control
1144          * read-only. set_cur_mix_value() will check the mask again and won't
1145          * issue write commands to read-only channels. */
1146         if (cval->channels == readonly_mask)
1147                 kctl = snd_ctl_new1(&usb_feature_unit_ctl_ro, cval);
1148         else
1149                 kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
1150
1151         if (! kctl) {
1152                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1153                 kfree(cval);
1154                 return;
1155         }
1156         kctl->private_free = usb_mixer_elem_free;
1157
1158         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
1159         mapped_name = len != 0;
1160         if (! len && nameid)
1161                 len = snd_usb_copy_string_desc(state, nameid,
1162                                 kctl->id.name, sizeof(kctl->id.name));
1163
1164         /* get min/max values */
1165         get_min_max_with_quirks(cval, 0, kctl);
1166
1167         switch (control) {
1168         case UAC_FU_MUTE:
1169         case UAC_FU_VOLUME:
1170                 /* determine the control name.  the rule is:
1171                  * - if a name id is given in descriptor, use it.
1172                  * - if the connected input can be determined, then use the name
1173                  *   of terminal type.
1174                  * - if the connected output can be determined, use it.
1175                  * - otherwise, anonymous name.
1176                  */
1177                 if (! len) {
1178                         len = get_term_name(state, iterm, kctl->id.name, sizeof(kctl->id.name), 1);
1179                         if (! len)
1180                                 len = get_term_name(state, &state->oterm, kctl->id.name, sizeof(kctl->id.name), 1);
1181                         if (! len)
1182                                 len = snprintf(kctl->id.name, sizeof(kctl->id.name),
1183                                                "Feature %d", unitid);
1184                 }
1185                 /* determine the stream direction:
1186                  * if the connected output is USB stream, then it's likely a
1187                  * capture stream.  otherwise it should be playback (hopefully :)
1188                  */
1189                 if (! mapped_name && ! (state->oterm.type >> 16)) {
1190                         if ((state->oterm.type & 0xff00) == 0x0100) {
1191                                 len = append_ctl_name(kctl, " Capture");
1192                         } else {
1193                                 len = append_ctl_name(kctl, " Playback");
1194                         }
1195                 }
1196                 append_ctl_name(kctl, control == UAC_FU_MUTE ?
1197                                 " Switch" : " Volume");
1198                 if (control == UAC_FU_VOLUME) {
1199                         check_mapped_dB(map, cval);
1200                         if (cval->dBmin < cval->dBmax || !cval->initialized) {
1201                                 kctl->tlv.c = mixer_vol_tlv;
1202                                 kctl->vd[0].access |=
1203                                         SNDRV_CTL_ELEM_ACCESS_TLV_READ |
1204                                         SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
1205                         }
1206                 }
1207                 break;
1208
1209         default:
1210                 if (! len)
1211                         strlcpy(kctl->id.name, audio_feature_info[control-1].name,
1212                                 sizeof(kctl->id.name));
1213                 break;
1214         }
1215
1216         range = (cval->max - cval->min) / cval->res;
1217         /* Are there devices with volume range more than 255? I use a bit more
1218          * to be sure. 384 is a resolution magic number found on Logitech
1219          * devices. It will definitively catch all buggy Logitech devices.
1220          */
1221         if (range > 384) {
1222                 snd_printk(KERN_WARNING "usb_audio: Warning! Unlikely big "
1223                            "volume range (=%u), cval->res is probably wrong.",
1224                            range);
1225                 snd_printk(KERN_WARNING "usb_audio: [%d] FU [%s] ch = %d, "
1226                            "val = %d/%d/%d", cval->id,
1227                            kctl->id.name, cval->channels,
1228                            cval->min, cval->max, cval->res);
1229         }
1230
1231         snd_printdd(KERN_INFO "[%d] FU [%s] ch = %d, val = %d/%d/%d\n",
1232                     cval->id, kctl->id.name, cval->channels, cval->min, cval->max, cval->res);
1233         snd_usb_mixer_add_control(state->mixer, kctl);
1234 }
1235
1236
1237
1238 /*
1239  * parse a feature unit
1240  *
1241  * most of controls are defined here.
1242  */
1243 static int parse_audio_feature_unit(struct mixer_build *state, int unitid, void *_ftr)
1244 {
1245         int channels, i, j;
1246         struct usb_audio_term iterm;
1247         unsigned int master_bits, first_ch_bits;
1248         int err, csize;
1249         struct uac_feature_unit_descriptor *hdr = _ftr;
1250         __u8 *bmaControls;
1251
1252         if (state->mixer->protocol == UAC_VERSION_1) {
1253                 csize = hdr->bControlSize;
1254                 if (!csize) {
1255                         snd_printdd(KERN_ERR "usbaudio: unit %u: "
1256                                     "invalid bControlSize == 0\n", unitid);
1257                         return -EINVAL;
1258                 }
1259                 channels = (hdr->bLength - 7) / csize - 1;
1260                 bmaControls = hdr->bmaControls;
1261                 if (hdr->bLength < 7 + csize) {
1262                         snd_printk(KERN_ERR "usbaudio: unit %u: "
1263                                    "invalid UAC_FEATURE_UNIT descriptor\n",
1264                                    unitid);
1265                         return -EINVAL;
1266                 }
1267         } else {
1268                 struct uac2_feature_unit_descriptor *ftr = _ftr;
1269                 csize = 4;
1270                 channels = (hdr->bLength - 6) / 4 - 1;
1271                 bmaControls = ftr->bmaControls;
1272                 if (hdr->bLength < 6 + csize) {
1273                         snd_printk(KERN_ERR "usbaudio: unit %u: "
1274                                    "invalid UAC_FEATURE_UNIT descriptor\n",
1275                                    unitid);
1276                         return -EINVAL;
1277                 }
1278         }
1279
1280         /* parse the source unit */
1281         if ((err = parse_audio_unit(state, hdr->bSourceID)) < 0)
1282                 return err;
1283
1284         /* determine the input source type and name */
1285         err = check_input_term(state, hdr->bSourceID, &iterm);
1286         if (err < 0)
1287                 return err;
1288
1289         master_bits = snd_usb_combine_bytes(bmaControls, csize);
1290         /* master configuration quirks */
1291         switch (state->chip->usb_id) {
1292         case USB_ID(0x08bb, 0x2702):
1293                 snd_printk(KERN_INFO
1294                            "usbmixer: master volume quirk for PCM2702 chip\n");
1295                 /* disable non-functional volume control */
1296                 master_bits &= ~UAC_CONTROL_BIT(UAC_FU_VOLUME);
1297                 break;
1298         }
1299         if (channels > 0)
1300                 first_ch_bits = snd_usb_combine_bytes(bmaControls + csize, csize);
1301         else
1302                 first_ch_bits = 0;
1303
1304         if (state->mixer->protocol == UAC_VERSION_1) {
1305                 /* check all control types */
1306                 for (i = 0; i < 10; i++) {
1307                         unsigned int ch_bits = 0;
1308                         for (j = 0; j < channels; j++) {
1309                                 unsigned int mask = snd_usb_combine_bytes(bmaControls + csize * (j+1), csize);
1310                                 if (mask & (1 << i))
1311                                         ch_bits |= (1 << j);
1312                         }
1313                         /* audio class v1 controls are never read-only */
1314                         if (ch_bits & 1) /* the first channel must be set (for ease of programming) */
1315                                 build_feature_ctl(state, _ftr, ch_bits, i, &iterm, unitid, 0);
1316                         if (master_bits & (1 << i))
1317                                 build_feature_ctl(state, _ftr, 0, i, &iterm, unitid, 0);
1318                 }
1319         } else { /* UAC_VERSION_2 */
1320                 for (i = 0; i < ARRAY_SIZE(audio_feature_info); i++) {
1321                         unsigned int ch_bits = 0;
1322                         unsigned int ch_read_only = 0;
1323
1324                         for (j = 0; j < channels; j++) {
1325                                 unsigned int mask = snd_usb_combine_bytes(bmaControls + csize * (j+1), csize);
1326                                 if (uac2_control_is_readable(mask, i)) {
1327                                         ch_bits |= (1 << j);
1328                                         if (!uac2_control_is_writeable(mask, i))
1329                                                 ch_read_only |= (1 << j);
1330                                 }
1331                         }
1332
1333                         /* NOTE: build_feature_ctl() will mark the control read-only if all channels
1334                          * are marked read-only in the descriptors. Otherwise, the control will be
1335                          * reported as writeable, but the driver will not actually issue a write
1336                          * command for read-only channels */
1337                         if (ch_bits & 1) /* the first channel must be set (for ease of programming) */
1338                                 build_feature_ctl(state, _ftr, ch_bits, i, &iterm, unitid, ch_read_only);
1339                         if (uac2_control_is_readable(master_bits, i))
1340                                 build_feature_ctl(state, _ftr, 0, i, &iterm, unitid,
1341                                                   !uac2_control_is_writeable(master_bits, i));
1342                 }
1343         }
1344
1345         return 0;
1346 }
1347
1348
1349 /*
1350  * Mixer Unit
1351  */
1352
1353 /*
1354  * build a mixer unit control
1355  *
1356  * the callbacks are identical with feature unit.
1357  * input channel number (zero based) is given in control field instead.
1358  */
1359
1360 static void build_mixer_unit_ctl(struct mixer_build *state,
1361                                  struct uac_mixer_unit_descriptor *desc,
1362                                  int in_pin, int in_ch, int unitid,
1363                                  struct usb_audio_term *iterm)
1364 {
1365         struct usb_mixer_elem_info *cval;
1366         unsigned int num_outs = uac_mixer_unit_bNrChannels(desc);
1367         unsigned int i, len;
1368         struct snd_kcontrol *kctl;
1369         const struct usbmix_name_map *map;
1370
1371         map = find_map(state, unitid, 0);
1372         if (check_ignored_ctl(map))
1373                 return;
1374
1375         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1376         if (! cval)
1377                 return;
1378
1379         cval->mixer = state->mixer;
1380         cval->id = unitid;
1381         cval->control = in_ch + 1; /* based on 1 */
1382         cval->val_type = USB_MIXER_S16;
1383         for (i = 0; i < num_outs; i++) {
1384                 if (check_matrix_bitmap(uac_mixer_unit_bmControls(desc, state->mixer->protocol), in_ch, i, num_outs)) {
1385                         cval->cmask |= (1 << i);
1386                         cval->channels++;
1387                 }
1388         }
1389
1390         /* get min/max values */
1391         get_min_max(cval, 0);
1392
1393         kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
1394         if (! kctl) {
1395                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1396                 kfree(cval);
1397                 return;
1398         }
1399         kctl->private_free = usb_mixer_elem_free;
1400
1401         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
1402         if (! len)
1403                 len = get_term_name(state, iterm, kctl->id.name, sizeof(kctl->id.name), 0);
1404         if (! len)
1405                 len = sprintf(kctl->id.name, "Mixer Source %d", in_ch + 1);
1406         append_ctl_name(kctl, " Volume");
1407
1408         snd_printdd(KERN_INFO "[%d] MU [%s] ch = %d, val = %d/%d\n",
1409                     cval->id, kctl->id.name, cval->channels, cval->min, cval->max);
1410         snd_usb_mixer_add_control(state->mixer, kctl);
1411 }
1412
1413
1414 /*
1415  * parse a mixer unit
1416  */
1417 static int parse_audio_mixer_unit(struct mixer_build *state, int unitid, void *raw_desc)
1418 {
1419         struct uac_mixer_unit_descriptor *desc = raw_desc;
1420         struct usb_audio_term iterm;
1421         int input_pins, num_ins, num_outs;
1422         int pin, ich, err;
1423
1424         if (desc->bLength < 11 || ! (input_pins = desc->bNrInPins) || ! (num_outs = uac_mixer_unit_bNrChannels(desc))) {
1425                 snd_printk(KERN_ERR "invalid MIXER UNIT descriptor %d\n", unitid);
1426                 return -EINVAL;
1427         }
1428         /* no bmControls field (e.g. Maya44) -> ignore */
1429         if (desc->bLength <= 10 + input_pins) {
1430                 snd_printdd(KERN_INFO "MU %d has no bmControls field\n", unitid);
1431                 return 0;
1432         }
1433
1434         num_ins = 0;
1435         ich = 0;
1436         for (pin = 0; pin < input_pins; pin++) {
1437                 err = parse_audio_unit(state, desc->baSourceID[pin]);
1438                 if (err < 0)
1439                         return err;
1440                 err = check_input_term(state, desc->baSourceID[pin], &iterm);
1441                 if (err < 0)
1442                         return err;
1443                 num_ins += iterm.channels;
1444                 for (; ich < num_ins; ++ich) {
1445                         int och, ich_has_controls = 0;
1446
1447                         for (och = 0; och < num_outs; ++och) {
1448                                 if (check_matrix_bitmap(uac_mixer_unit_bmControls(desc, state->mixer->protocol),
1449                                                         ich, och, num_outs)) {
1450                                         ich_has_controls = 1;
1451                                         break;
1452                                 }
1453                         }
1454                         if (ich_has_controls)
1455                                 build_mixer_unit_ctl(state, desc, pin, ich,
1456                                                      unitid, &iterm);
1457                 }
1458         }
1459         return 0;
1460 }
1461
1462
1463 /*
1464  * Processing Unit / Extension Unit
1465  */
1466
1467 /* get callback for processing/extension unit */
1468 static int mixer_ctl_procunit_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1469 {
1470         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1471         int err, val;
1472
1473         err = get_cur_ctl_value(cval, cval->control << 8, &val);
1474         if (err < 0 && cval->mixer->ignore_ctl_error) {
1475                 ucontrol->value.integer.value[0] = cval->min;
1476                 return 0;
1477         }
1478         if (err < 0)
1479                 return err;
1480         val = get_relative_value(cval, val);
1481         ucontrol->value.integer.value[0] = val;
1482         return 0;
1483 }
1484
1485 /* put callback for processing/extension unit */
1486 static int mixer_ctl_procunit_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1487 {
1488         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1489         int val, oval, err;
1490
1491         err = get_cur_ctl_value(cval, cval->control << 8, &oval);
1492         if (err < 0) {
1493                 if (cval->mixer->ignore_ctl_error)
1494                         return 0;
1495                 return err;
1496         }
1497         val = ucontrol->value.integer.value[0];
1498         val = get_abs_value(cval, val);
1499         if (val != oval) {
1500                 set_cur_ctl_value(cval, cval->control << 8, val);
1501                 return 1;
1502         }
1503         return 0;
1504 }
1505
1506 /* alsa control interface for processing/extension unit */
1507 static struct snd_kcontrol_new mixer_procunit_ctl = {
1508         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1509         .name = "", /* will be filled later */
1510         .info = mixer_ctl_feature_info,
1511         .get = mixer_ctl_procunit_get,
1512         .put = mixer_ctl_procunit_put,
1513 };
1514
1515
1516 /*
1517  * predefined data for processing units
1518  */
1519 struct procunit_value_info {
1520         int control;
1521         char *suffix;
1522         int val_type;
1523         int min_value;
1524 };
1525
1526 struct procunit_info {
1527         int type;
1528         char *name;
1529         struct procunit_value_info *values;
1530 };
1531
1532 static struct procunit_value_info updown_proc_info[] = {
1533         { UAC_UD_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1534         { UAC_UD_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
1535         { 0 }
1536 };
1537 static struct procunit_value_info prologic_proc_info[] = {
1538         { UAC_DP_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1539         { UAC_DP_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
1540         { 0 }
1541 };
1542 static struct procunit_value_info threed_enh_proc_info[] = {
1543         { UAC_3D_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1544         { UAC_3D_SPACE, "Spaciousness", USB_MIXER_U8 },
1545         { 0 }
1546 };
1547 static struct procunit_value_info reverb_proc_info[] = {
1548         { UAC_REVERB_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1549         { UAC_REVERB_LEVEL, "Level", USB_MIXER_U8 },
1550         { UAC_REVERB_TIME, "Time", USB_MIXER_U16 },
1551         { UAC_REVERB_FEEDBACK, "Feedback", USB_MIXER_U8 },
1552         { 0 }
1553 };
1554 static struct procunit_value_info chorus_proc_info[] = {
1555         { UAC_CHORUS_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1556         { UAC_CHORUS_LEVEL, "Level", USB_MIXER_U8 },
1557         { UAC_CHORUS_RATE, "Rate", USB_MIXER_U16 },
1558         { UAC_CHORUS_DEPTH, "Depth", USB_MIXER_U16 },
1559         { 0 }
1560 };
1561 static struct procunit_value_info dcr_proc_info[] = {
1562         { UAC_DCR_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1563         { UAC_DCR_RATE, "Ratio", USB_MIXER_U16 },
1564         { UAC_DCR_MAXAMPL, "Max Amp", USB_MIXER_S16 },
1565         { UAC_DCR_THRESHOLD, "Threshold", USB_MIXER_S16 },
1566         { UAC_DCR_ATTACK_TIME, "Attack Time", USB_MIXER_U16 },
1567         { UAC_DCR_RELEASE_TIME, "Release Time", USB_MIXER_U16 },
1568         { 0 }
1569 };
1570
1571 static struct procunit_info procunits[] = {
1572         { UAC_PROCESS_UP_DOWNMIX, "Up Down", updown_proc_info },
1573         { UAC_PROCESS_DOLBY_PROLOGIC, "Dolby Prologic", prologic_proc_info },
1574         { UAC_PROCESS_STEREO_EXTENDER, "3D Stereo Extender", threed_enh_proc_info },
1575         { UAC_PROCESS_REVERB, "Reverb", reverb_proc_info },
1576         { UAC_PROCESS_CHORUS, "Chorus", chorus_proc_info },
1577         { UAC_PROCESS_DYN_RANGE_COMP, "DCR", dcr_proc_info },
1578         { 0 },
1579 };
1580 /*
1581  * predefined data for extension units
1582  */
1583 static struct procunit_value_info clock_rate_xu_info[] = {
1584         { USB_XU_CLOCK_RATE_SELECTOR, "Selector", USB_MIXER_U8, 0 },
1585         { 0 }
1586 };
1587 static struct procunit_value_info clock_source_xu_info[] = {
1588         { USB_XU_CLOCK_SOURCE_SELECTOR, "External", USB_MIXER_BOOLEAN },
1589         { 0 }
1590 };
1591 static struct procunit_value_info spdif_format_xu_info[] = {
1592         { USB_XU_DIGITAL_FORMAT_SELECTOR, "SPDIF/AC3", USB_MIXER_BOOLEAN },
1593         { 0 }
1594 };
1595 static struct procunit_value_info soft_limit_xu_info[] = {
1596         { USB_XU_SOFT_LIMIT_SELECTOR, " ", USB_MIXER_BOOLEAN },
1597         { 0 }
1598 };
1599 static struct procunit_info extunits[] = {
1600         { USB_XU_CLOCK_RATE, "Clock rate", clock_rate_xu_info },
1601         { USB_XU_CLOCK_SOURCE, "DigitalIn CLK source", clock_source_xu_info },
1602         { USB_XU_DIGITAL_IO_STATUS, "DigitalOut format:", spdif_format_xu_info },
1603         { USB_XU_DEVICE_OPTIONS, "AnalogueIn Soft Limit", soft_limit_xu_info },
1604         { 0 }
1605 };
1606 /*
1607  * build a processing/extension unit
1608  */
1609 static int build_audio_procunit(struct mixer_build *state, int unitid, void *raw_desc, struct procunit_info *list, char *name)
1610 {
1611         struct uac_processing_unit_descriptor *desc = raw_desc;
1612         int num_ins = desc->bNrInPins;
1613         struct usb_mixer_elem_info *cval;
1614         struct snd_kcontrol *kctl;
1615         int i, err, nameid, type, len;
1616         struct procunit_info *info;
1617         struct procunit_value_info *valinfo;
1618         const struct usbmix_name_map *map;
1619         static struct procunit_value_info default_value_info[] = {
1620                 { 0x01, "Switch", USB_MIXER_BOOLEAN },
1621                 { 0 }
1622         };
1623         static struct procunit_info default_info = {
1624                 0, NULL, default_value_info
1625         };
1626
1627         if (desc->bLength < 13 || desc->bLength < 13 + num_ins ||
1628             desc->bLength < num_ins + uac_processing_unit_bControlSize(desc, state->mixer->protocol)) {
1629                 snd_printk(KERN_ERR "invalid %s descriptor (id %d)\n", name, unitid);
1630                 return -EINVAL;
1631         }
1632
1633         for (i = 0; i < num_ins; i++) {
1634                 if ((err = parse_audio_unit(state, desc->baSourceID[i])) < 0)
1635                         return err;
1636         }
1637
1638         type = le16_to_cpu(desc->wProcessType);
1639         for (info = list; info && info->type; info++)
1640                 if (info->type == type)
1641                         break;
1642         if (! info || ! info->type)
1643                 info = &default_info;
1644
1645         for (valinfo = info->values; valinfo->control; valinfo++) {
1646                 __u8 *controls = uac_processing_unit_bmControls(desc, state->mixer->protocol);
1647
1648                 if (! (controls[valinfo->control / 8] & (1 << ((valinfo->control % 8) - 1))))
1649                         continue;
1650                 map = find_map(state, unitid, valinfo->control);
1651                 if (check_ignored_ctl(map))
1652                         continue;
1653                 cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1654                 if (! cval) {
1655                         snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1656                         return -ENOMEM;
1657                 }
1658                 cval->mixer = state->mixer;
1659                 cval->id = unitid;
1660                 cval->control = valinfo->control;
1661                 cval->val_type = valinfo->val_type;
1662                 cval->channels = 1;
1663
1664                 /* get min/max values */
1665                 if (type == UAC_PROCESS_UP_DOWNMIX && cval->control == UAC_UD_MODE_SELECT) {
1666                         __u8 *control_spec = uac_processing_unit_specific(desc, state->mixer->protocol);
1667                         /* FIXME: hard-coded */
1668                         cval->min = 1;
1669                         cval->max = control_spec[0];
1670                         cval->res = 1;
1671                         cval->initialized = 1;
1672                 } else {
1673                         if (type == USB_XU_CLOCK_RATE) {
1674                                 /* E-Mu USB 0404/0202/TrackerPre/0204
1675                                  * samplerate control quirk
1676                                  */
1677                                 cval->min = 0;
1678                                 cval->max = 5;
1679                                 cval->res = 1;
1680                                 cval->initialized = 1;
1681                         } else
1682                                 get_min_max(cval, valinfo->min_value);
1683                 }
1684
1685                 kctl = snd_ctl_new1(&mixer_procunit_ctl, cval);
1686                 if (! kctl) {
1687                         snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1688                         kfree(cval);
1689                         return -ENOMEM;
1690                 }
1691                 kctl->private_free = usb_mixer_elem_free;
1692
1693                 if (check_mapped_name(map, kctl->id.name,
1694                                                 sizeof(kctl->id.name)))
1695                         /* nothing */ ;
1696                 else if (info->name)
1697                         strlcpy(kctl->id.name, info->name, sizeof(kctl->id.name));
1698                 else {
1699                         nameid = uac_processing_unit_iProcessing(desc, state->mixer->protocol);
1700                         len = 0;
1701                         if (nameid)
1702                                 len = snd_usb_copy_string_desc(state, nameid, kctl->id.name, sizeof(kctl->id.name));
1703                         if (! len)
1704                                 strlcpy(kctl->id.name, name, sizeof(kctl->id.name));
1705                 }
1706                 append_ctl_name(kctl, " ");
1707                 append_ctl_name(kctl, valinfo->suffix);
1708
1709                 snd_printdd(KERN_INFO "[%d] PU [%s] ch = %d, val = %d/%d\n",
1710                             cval->id, kctl->id.name, cval->channels, cval->min, cval->max);
1711                 if ((err = snd_usb_mixer_add_control(state->mixer, kctl)) < 0)
1712                         return err;
1713         }
1714         return 0;
1715 }
1716
1717
1718 static int parse_audio_processing_unit(struct mixer_build *state, int unitid, void *raw_desc)
1719 {
1720         return build_audio_procunit(state, unitid, raw_desc, procunits, "Processing Unit");
1721 }
1722
1723 static int parse_audio_extension_unit(struct mixer_build *state, int unitid, void *raw_desc)
1724 {
1725         /* Note that we parse extension units with processing unit descriptors.
1726          * That's ok as the layout is the same */
1727         return build_audio_procunit(state, unitid, raw_desc, extunits, "Extension Unit");
1728 }
1729
1730
1731 /*
1732  * Selector Unit
1733  */
1734
1735 /* info callback for selector unit
1736  * use an enumerator type for routing
1737  */
1738 static int mixer_ctl_selector_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
1739 {
1740         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1741         const char **itemlist = (const char **)kcontrol->private_value;
1742
1743         if (snd_BUG_ON(!itemlist))
1744                 return -EINVAL;
1745         return snd_ctl_enum_info(uinfo, 1, cval->max, itemlist);
1746 }
1747
1748 /* get callback for selector unit */
1749 static int mixer_ctl_selector_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1750 {
1751         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1752         int val, err;
1753
1754         err = get_cur_ctl_value(cval, cval->control << 8, &val);
1755         if (err < 0) {
1756                 if (cval->mixer->ignore_ctl_error) {
1757                         ucontrol->value.enumerated.item[0] = 0;
1758                         return 0;
1759                 }
1760                 return err;
1761         }
1762         val = get_relative_value(cval, val);
1763         ucontrol->value.enumerated.item[0] = val;
1764         return 0;
1765 }
1766
1767 /* put callback for selector unit */
1768 static int mixer_ctl_selector_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1769 {
1770         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1771         int val, oval, err;
1772
1773         err = get_cur_ctl_value(cval, cval->control << 8, &oval);
1774         if (err < 0) {
1775                 if (cval->mixer->ignore_ctl_error)
1776                         return 0;
1777                 return err;
1778         }
1779         val = ucontrol->value.enumerated.item[0];
1780         val = get_abs_value(cval, val);
1781         if (val != oval) {
1782                 set_cur_ctl_value(cval, cval->control << 8, val);
1783                 return 1;
1784         }
1785         return 0;
1786 }
1787
1788 /* alsa control interface for selector unit */
1789 static struct snd_kcontrol_new mixer_selectunit_ctl = {
1790         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1791         .name = "", /* will be filled later */
1792         .info = mixer_ctl_selector_info,
1793         .get = mixer_ctl_selector_get,
1794         .put = mixer_ctl_selector_put,
1795 };
1796
1797
1798 /* private free callback.
1799  * free both private_data and private_value
1800  */
1801 static void usb_mixer_selector_elem_free(struct snd_kcontrol *kctl)
1802 {
1803         int i, num_ins = 0;
1804
1805         if (kctl->private_data) {
1806                 struct usb_mixer_elem_info *cval = kctl->private_data;
1807                 num_ins = cval->max;
1808                 kfree(cval);
1809                 kctl->private_data = NULL;
1810         }
1811         if (kctl->private_value) {
1812                 char **itemlist = (char **)kctl->private_value;
1813                 for (i = 0; i < num_ins; i++)
1814                         kfree(itemlist[i]);
1815                 kfree(itemlist);
1816                 kctl->private_value = 0;
1817         }
1818 }
1819
1820 /*
1821  * parse a selector unit
1822  */
1823 static int parse_audio_selector_unit(struct mixer_build *state, int unitid, void *raw_desc)
1824 {
1825         struct uac_selector_unit_descriptor *desc = raw_desc;
1826         unsigned int i, nameid, len;
1827         int err;
1828         struct usb_mixer_elem_info *cval;
1829         struct snd_kcontrol *kctl;
1830         const struct usbmix_name_map *map;
1831         char **namelist;
1832
1833         if (!desc->bNrInPins || desc->bLength < 5 + desc->bNrInPins) {
1834                 snd_printk(KERN_ERR "invalid SELECTOR UNIT descriptor %d\n", unitid);
1835                 return -EINVAL;
1836         }
1837
1838         for (i = 0; i < desc->bNrInPins; i++) {
1839                 if ((err = parse_audio_unit(state, desc->baSourceID[i])) < 0)
1840                         return err;
1841         }
1842
1843         if (desc->bNrInPins == 1) /* only one ? nonsense! */
1844                 return 0;
1845
1846         map = find_map(state, unitid, 0);
1847         if (check_ignored_ctl(map))
1848                 return 0;
1849
1850         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1851         if (! cval) {
1852                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1853                 return -ENOMEM;
1854         }
1855         cval->mixer = state->mixer;
1856         cval->id = unitid;
1857         cval->val_type = USB_MIXER_U8;
1858         cval->channels = 1;
1859         cval->min = 1;
1860         cval->max = desc->bNrInPins;
1861         cval->res = 1;
1862         cval->initialized = 1;
1863
1864         if (desc->bDescriptorSubtype == UAC2_CLOCK_SELECTOR)
1865                 cval->control = UAC2_CX_CLOCK_SELECTOR;
1866         else
1867                 cval->control = 0;
1868
1869         namelist = kmalloc(sizeof(char *) * desc->bNrInPins, GFP_KERNEL);
1870         if (! namelist) {
1871                 snd_printk(KERN_ERR "cannot malloc\n");
1872                 kfree(cval);
1873                 return -ENOMEM;
1874         }
1875 #define MAX_ITEM_NAME_LEN       64
1876         for (i = 0; i < desc->bNrInPins; i++) {
1877                 struct usb_audio_term iterm;
1878                 len = 0;
1879                 namelist[i] = kmalloc(MAX_ITEM_NAME_LEN, GFP_KERNEL);
1880                 if (! namelist[i]) {
1881                         snd_printk(KERN_ERR "cannot malloc\n");
1882                         while (i--)
1883                                 kfree(namelist[i]);
1884                         kfree(namelist);
1885                         kfree(cval);
1886                         return -ENOMEM;
1887                 }
1888                 len = check_mapped_selector_name(state, unitid, i, namelist[i],
1889                                                  MAX_ITEM_NAME_LEN);
1890                 if (! len && check_input_term(state, desc->baSourceID[i], &iterm) >= 0)
1891                         len = get_term_name(state, &iterm, namelist[i], MAX_ITEM_NAME_LEN, 0);
1892                 if (! len)
1893                         sprintf(namelist[i], "Input %d", i);
1894         }
1895
1896         kctl = snd_ctl_new1(&mixer_selectunit_ctl, cval);
1897         if (! kctl) {
1898                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1899                 kfree(namelist);
1900                 kfree(cval);
1901                 return -ENOMEM;
1902         }
1903         kctl->private_value = (unsigned long)namelist;
1904         kctl->private_free = usb_mixer_selector_elem_free;
1905
1906         nameid = uac_selector_unit_iSelector(desc);
1907         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
1908         if (len)
1909                 ;
1910         else if (nameid)
1911                 snd_usb_copy_string_desc(state, nameid, kctl->id.name, sizeof(kctl->id.name));
1912         else {
1913                 len = get_term_name(state, &state->oterm,
1914                                     kctl->id.name, sizeof(kctl->id.name), 0);
1915                 if (! len)
1916                         strlcpy(kctl->id.name, "USB", sizeof(kctl->id.name));
1917
1918                 if (desc->bDescriptorSubtype == UAC2_CLOCK_SELECTOR)
1919                         append_ctl_name(kctl, " Clock Source");
1920                 else if ((state->oterm.type & 0xff00) == 0x0100)
1921                         append_ctl_name(kctl, " Capture Source");
1922                 else
1923                         append_ctl_name(kctl, " Playback Source");
1924         }
1925
1926         snd_printdd(KERN_INFO "[%d] SU [%s] items = %d\n",
1927                     cval->id, kctl->id.name, desc->bNrInPins);
1928         if ((err = snd_usb_mixer_add_control(state->mixer, kctl)) < 0)
1929                 return err;
1930
1931         return 0;
1932 }
1933
1934
1935 /*
1936  * parse an audio unit recursively
1937  */
1938
1939 static int parse_audio_unit(struct mixer_build *state, int unitid)
1940 {
1941         unsigned char *p1;
1942
1943         if (test_and_set_bit(unitid, state->unitbitmap))
1944                 return 0; /* the unit already visited */
1945
1946         p1 = find_audio_control_unit(state, unitid);
1947         if (!p1) {
1948                 snd_printk(KERN_ERR "usbaudio: unit %d not found!\n", unitid);
1949                 return -EINVAL;
1950         }
1951
1952         switch (p1[2]) {
1953         case UAC_INPUT_TERMINAL:
1954         case UAC2_CLOCK_SOURCE:
1955                 return 0; /* NOP */
1956         case UAC_MIXER_UNIT:
1957                 return parse_audio_mixer_unit(state, unitid, p1);
1958         case UAC_SELECTOR_UNIT:
1959         case UAC2_CLOCK_SELECTOR:
1960                 return parse_audio_selector_unit(state, unitid, p1);
1961         case UAC_FEATURE_UNIT:
1962                 return parse_audio_feature_unit(state, unitid, p1);
1963         case UAC1_PROCESSING_UNIT:
1964         /*   UAC2_EFFECT_UNIT has the same value */
1965                 if (state->mixer->protocol == UAC_VERSION_1)
1966                         return parse_audio_processing_unit(state, unitid, p1);
1967                 else
1968                         return 0; /* FIXME - effect units not implemented yet */
1969         case UAC1_EXTENSION_UNIT:
1970         /*   UAC2_PROCESSING_UNIT_V2 has the same value */
1971                 if (state->mixer->protocol == UAC_VERSION_1)
1972                         return parse_audio_extension_unit(state, unitid, p1);
1973                 else /* UAC_VERSION_2 */
1974                         return parse_audio_processing_unit(state, unitid, p1);
1975         case UAC2_EXTENSION_UNIT_V2:
1976                 return parse_audio_extension_unit(state, unitid, p1);
1977         default:
1978                 snd_printk(KERN_ERR "usbaudio: unit %u: unexpected type 0x%02x\n", unitid, p1[2]);
1979                 return -EINVAL;
1980         }
1981 }
1982
1983 static void snd_usb_mixer_free(struct usb_mixer_interface *mixer)
1984 {
1985         kfree(mixer->id_elems);
1986         if (mixer->urb) {
1987                 kfree(mixer->urb->transfer_buffer);
1988                 usb_free_urb(mixer->urb);
1989         }
1990         usb_free_urb(mixer->rc_urb);
1991         kfree(mixer->rc_setup_packet);
1992         kfree(mixer);
1993 }
1994
1995 static int snd_usb_mixer_dev_free(struct snd_device *device)
1996 {
1997         struct usb_mixer_interface *mixer = device->device_data;
1998         snd_usb_mixer_free(mixer);
1999         return 0;
2000 }
2001
2002 /*
2003  * create mixer controls
2004  *
2005  * walk through all UAC_OUTPUT_TERMINAL descriptors to search for mixers
2006  */
2007 static int snd_usb_mixer_controls(struct usb_mixer_interface *mixer)
2008 {
2009         struct mixer_build state;
2010         int err;
2011         const struct usbmix_ctl_map *map;
2012         void *p;
2013
2014         memset(&state, 0, sizeof(state));
2015         state.chip = mixer->chip;
2016         state.mixer = mixer;
2017         state.buffer = mixer->hostif->extra;
2018         state.buflen = mixer->hostif->extralen;
2019
2020         /* check the mapping table */
2021         for (map = usbmix_ctl_maps; map->id; map++) {
2022                 if (map->id == state.chip->usb_id) {
2023                         state.map = map->map;
2024                         state.selector_map = map->selector_map;
2025                         mixer->ignore_ctl_error = map->ignore_ctl_error;
2026                         break;
2027                 }
2028         }
2029
2030         p = NULL;
2031         while ((p = snd_usb_find_csint_desc(mixer->hostif->extra, mixer->hostif->extralen,
2032                                             p, UAC_OUTPUT_TERMINAL)) != NULL) {
2033                 if (mixer->protocol == UAC_VERSION_1) {
2034                         struct uac1_output_terminal_descriptor *desc = p;
2035
2036                         if (desc->bLength < sizeof(*desc))
2037                                 continue; /* invalid descriptor? */
2038                         set_bit(desc->bTerminalID, state.unitbitmap);  /* mark terminal ID as visited */
2039                         state.oterm.id = desc->bTerminalID;
2040                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
2041                         state.oterm.name = desc->iTerminal;
2042                         err = parse_audio_unit(&state, desc->bSourceID);
2043                         if (err < 0 && err != -EINVAL)
2044                                 return err;
2045                 } else { /* UAC_VERSION_2 */
2046                         struct uac2_output_terminal_descriptor *desc = p;
2047
2048                         if (desc->bLength < sizeof(*desc))
2049                                 continue; /* invalid descriptor? */
2050                         set_bit(desc->bTerminalID, state.unitbitmap);  /* mark terminal ID as visited */
2051                         state.oterm.id = desc->bTerminalID;
2052                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
2053                         state.oterm.name = desc->iTerminal;
2054                         err = parse_audio_unit(&state, desc->bSourceID);
2055                         if (err < 0 && err != -EINVAL)
2056                                 return err;
2057
2058                         /* for UAC2, use the same approach to also add the clock selectors */
2059                         err = parse_audio_unit(&state, desc->bCSourceID);
2060                         if (err < 0 && err != -EINVAL)
2061                                 return err;
2062                 }
2063         }
2064
2065         return 0;
2066 }
2067
2068 void snd_usb_mixer_notify_id(struct usb_mixer_interface *mixer, int unitid)
2069 {
2070         struct usb_mixer_elem_info *info;
2071
2072         for (info = mixer->id_elems[unitid]; info; info = info->next_id_elem)
2073                 snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
2074                                info->elem_id);
2075 }
2076
2077 static void snd_usb_mixer_dump_cval(struct snd_info_buffer *buffer,
2078                                     int unitid,
2079                                     struct usb_mixer_elem_info *cval)
2080 {
2081         static char *val_types[] = {"BOOLEAN", "INV_BOOLEAN",
2082                                     "S8", "U8", "S16", "U16"};
2083         snd_iprintf(buffer, "  Unit: %i\n", unitid);
2084         if (cval->elem_id)
2085                 snd_iprintf(buffer, "    Control: name=\"%s\", index=%i\n",
2086                                 cval->elem_id->name, cval->elem_id->index);
2087         snd_iprintf(buffer, "    Info: id=%i, control=%i, cmask=0x%x, "
2088                             "channels=%i, type=\"%s\"\n", cval->id,
2089                             cval->control, cval->cmask, cval->channels,
2090                             val_types[cval->val_type]);
2091         snd_iprintf(buffer, "    Volume: min=%i, max=%i, dBmin=%i, dBmax=%i\n",
2092                             cval->min, cval->max, cval->dBmin, cval->dBmax);
2093 }
2094
2095 static void snd_usb_mixer_proc_read(struct snd_info_entry *entry,
2096                                     struct snd_info_buffer *buffer)
2097 {
2098         struct snd_usb_audio *chip = entry->private_data;
2099         struct usb_mixer_interface *mixer;
2100         struct usb_mixer_elem_info *cval;
2101         int unitid;
2102
2103         list_for_each_entry(mixer, &chip->mixer_list, list) {
2104                 snd_iprintf(buffer,
2105                         "USB Mixer: usb_id=0x%08x, ctrlif=%i, ctlerr=%i\n",
2106                                 chip->usb_id, snd_usb_ctrl_intf(chip),
2107                                 mixer->ignore_ctl_error);
2108                 snd_iprintf(buffer, "Card: %s\n", chip->card->longname);
2109                 for (unitid = 0; unitid < MAX_ID_ELEMS; unitid++) {
2110                         for (cval = mixer->id_elems[unitid]; cval;
2111                                                 cval = cval->next_id_elem)
2112                                 snd_usb_mixer_dump_cval(buffer, unitid, cval);
2113                 }
2114         }
2115 }
2116
2117 static void snd_usb_mixer_interrupt_v2(struct usb_mixer_interface *mixer,
2118                                        int attribute, int value, int index)
2119 {
2120         struct usb_mixer_elem_info *info;
2121         __u8 unitid = (index >> 8) & 0xff;
2122         __u8 control = (value >> 8) & 0xff;
2123         __u8 channel = value & 0xff;
2124
2125         if (channel >= MAX_CHANNELS) {
2126                 snd_printk(KERN_DEBUG "%s(): bogus channel number %d\n",
2127                                 __func__, channel);
2128                 return;
2129         }
2130
2131         for (info = mixer->id_elems[unitid]; info; info = info->next_id_elem) {
2132                 if (info->control != control)
2133                         continue;
2134
2135                 switch (attribute) {
2136                 case UAC2_CS_CUR:
2137                         /* invalidate cache, so the value is read from the device */
2138                         if (channel)
2139                                 info->cached &= ~(1 << channel);
2140                         else /* master channel */
2141                                 info->cached = 0;
2142
2143                         snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
2144                                         info->elem_id);
2145                         break;
2146
2147                 case UAC2_CS_RANGE:
2148                         /* TODO */
2149                         break;
2150
2151                 case UAC2_CS_MEM:
2152                         /* TODO */
2153                         break;
2154
2155                 default:
2156                         snd_printk(KERN_DEBUG "unknown attribute %d in interrupt\n",
2157                                                 attribute);
2158                         break;
2159                 } /* switch */
2160         }
2161 }
2162
2163 static void snd_usb_mixer_interrupt(struct urb *urb)
2164 {
2165         struct usb_mixer_interface *mixer = urb->context;
2166         int len = urb->actual_length;
2167         int ustatus = urb->status;
2168
2169         if (ustatus != 0)
2170                 goto requeue;
2171
2172         if (mixer->protocol == UAC_VERSION_1) {
2173                 struct uac1_status_word *status;
2174
2175                 for (status = urb->transfer_buffer;
2176                      len >= sizeof(*status);
2177                      len -= sizeof(*status), status++) {
2178                         snd_printd(KERN_DEBUG "status interrupt: %02x %02x\n",
2179                                                 status->bStatusType,
2180                                                 status->bOriginator);
2181
2182                         /* ignore any notifications not from the control interface */
2183                         if ((status->bStatusType & UAC1_STATUS_TYPE_ORIG_MASK) !=
2184                                 UAC1_STATUS_TYPE_ORIG_AUDIO_CONTROL_IF)
2185                                 continue;
2186
2187                         if (status->bStatusType & UAC1_STATUS_TYPE_MEM_CHANGED)
2188                                 snd_usb_mixer_rc_memory_change(mixer, status->bOriginator);
2189                         else
2190                                 snd_usb_mixer_notify_id(mixer, status->bOriginator);
2191                 }
2192         } else { /* UAC_VERSION_2 */
2193                 struct uac2_interrupt_data_msg *msg;
2194
2195                 for (msg = urb->transfer_buffer;
2196                      len >= sizeof(*msg);
2197                      len -= sizeof(*msg), msg++) {
2198                         /* drop vendor specific and endpoint requests */
2199                         if ((msg->bInfo & UAC2_INTERRUPT_DATA_MSG_VENDOR) ||
2200                             (msg->bInfo & UAC2_INTERRUPT_DATA_MSG_EP))
2201                                 continue;
2202
2203                         snd_usb_mixer_interrupt_v2(mixer, msg->bAttribute,
2204                                                    le16_to_cpu(msg->wValue),
2205                                                    le16_to_cpu(msg->wIndex));
2206                 }
2207         }
2208
2209 requeue:
2210         if (ustatus != -ENOENT && ustatus != -ECONNRESET && ustatus != -ESHUTDOWN) {
2211                 urb->dev = mixer->chip->dev;
2212                 usb_submit_urb(urb, GFP_ATOMIC);
2213         }
2214 }
2215
2216 /* stop any bus activity of a mixer */
2217 void snd_usb_mixer_inactivate(struct usb_mixer_interface *mixer)
2218 {
2219         usb_kill_urb(mixer->urb);
2220         usb_kill_urb(mixer->rc_urb);
2221 }
2222
2223 int snd_usb_mixer_activate(struct usb_mixer_interface *mixer)
2224 {
2225         int err;
2226
2227         if (mixer->urb) {
2228                 err = usb_submit_urb(mixer->urb, GFP_NOIO);
2229                 if (err < 0)
2230                         return err;
2231         }
2232
2233         return 0;
2234 }
2235
2236 /* create the handler for the optional status interrupt endpoint */
2237 static int snd_usb_mixer_status_create(struct usb_mixer_interface *mixer)
2238 {
2239         struct usb_endpoint_descriptor *ep;
2240         void *transfer_buffer;
2241         int buffer_length;
2242         unsigned int epnum;
2243
2244         /* we need one interrupt input endpoint */
2245         if (get_iface_desc(mixer->hostif)->bNumEndpoints < 1)
2246                 return 0;
2247         ep = get_endpoint(mixer->hostif, 0);
2248         if (!usb_endpoint_dir_in(ep) || !usb_endpoint_xfer_int(ep))
2249                 return 0;
2250
2251         epnum = usb_endpoint_num(ep);
2252         buffer_length = le16_to_cpu(ep->wMaxPacketSize);
2253         transfer_buffer = kmalloc(buffer_length, GFP_KERNEL);
2254         if (!transfer_buffer)
2255                 return -ENOMEM;
2256         mixer->urb = usb_alloc_urb(0, GFP_KERNEL);
2257         if (!mixer->urb) {
2258                 kfree(transfer_buffer);
2259                 return -ENOMEM;
2260         }
2261         usb_fill_int_urb(mixer->urb, mixer->chip->dev,
2262                          usb_rcvintpipe(mixer->chip->dev, epnum),
2263                          transfer_buffer, buffer_length,
2264                          snd_usb_mixer_interrupt, mixer, ep->bInterval);
2265         usb_submit_urb(mixer->urb, GFP_KERNEL);
2266         return 0;
2267 }
2268
2269 int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif,
2270                          int ignore_error)
2271 {
2272         static struct snd_device_ops dev_ops = {
2273                 .dev_free = snd_usb_mixer_dev_free
2274         };
2275         struct usb_mixer_interface *mixer;
2276         struct snd_info_entry *entry;
2277         int err;
2278
2279         strcpy(chip->card->mixername, "USB Mixer");
2280
2281         mixer = kzalloc(sizeof(*mixer), GFP_KERNEL);
2282         if (!mixer)
2283                 return -ENOMEM;
2284         mixer->chip = chip;
2285         mixer->ignore_ctl_error = ignore_error;
2286         mixer->id_elems = kcalloc(MAX_ID_ELEMS, sizeof(*mixer->id_elems),
2287                                   GFP_KERNEL);
2288         if (!mixer->id_elems) {
2289                 kfree(mixer);
2290                 return -ENOMEM;
2291         }
2292
2293         mixer->hostif = &usb_ifnum_to_if(chip->dev, ctrlif)->altsetting[0];
2294         switch (get_iface_desc(mixer->hostif)->bInterfaceProtocol) {
2295         case UAC_VERSION_1:
2296         default:
2297                 mixer->protocol = UAC_VERSION_1;
2298                 break;
2299         case UAC_VERSION_2:
2300                 mixer->protocol = UAC_VERSION_2;
2301                 break;
2302         }
2303
2304         if ((err = snd_usb_mixer_controls(mixer)) < 0 ||
2305             (err = snd_usb_mixer_status_create(mixer)) < 0)
2306                 goto _error;
2307
2308         snd_usb_mixer_apply_create_quirk(mixer);
2309
2310         err = snd_device_new(chip->card, SNDRV_DEV_LOWLEVEL, mixer, &dev_ops);
2311         if (err < 0)
2312                 goto _error;
2313
2314         if (list_empty(&chip->mixer_list) &&
2315             !snd_card_proc_new(chip->card, "usbmixer", &entry))
2316                 snd_info_set_text_ops(entry, chip, snd_usb_mixer_proc_read);
2317
2318         list_add(&mixer->list, &chip->mixer_list);
2319         return 0;
2320
2321 _error:
2322         snd_usb_mixer_free(mixer);
2323         return err;
2324 }
2325
2326 void snd_usb_mixer_disconnect(struct list_head *p)
2327 {
2328         struct usb_mixer_interface *mixer;
2329
2330         mixer = list_entry(p, struct usb_mixer_interface, list);
2331         usb_kill_urb(mixer->urb);
2332         usb_kill_urb(mixer->rc_urb);
2333 }