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
  65 #define MAX_ID_ELEMS    256
  66
  67 struct usb_audio_term {
  68         int id;
  69         int type;
  70         int channels;
  71         unsigned int chconfig;
  72         int name;
  73 };
  74
  75 struct usbmix_name_map;
  76
  77 struct mixer_build {
  78         struct snd_usb_audio *chip;
  79         struct usb_mixer_interface *mixer;
  80         unsigned char *buffer;
  81         unsigned int buflen;
  82         DECLARE_BITMAP(unitbitmap, MAX_ID_ELEMS);
  83         struct usb_audio_term oterm;
  84         const struct usbmix_name_map *map;
  85         const struct usbmix_selector_map *selector_map;
  86 };
  87
  88 enum {
  89         USB_MIXER_BOOLEAN,
  90         USB_MIXER_INV_BOOLEAN,
  91         USB_MIXER_S8,
  92         USB_MIXER_U8,
  93         USB_MIXER_S16,
  94         USB_MIXER_U16,
  95 };
  96
  97
  98 /*E-mu 0202(0404) eXtension Unit(XU) control*/
  99 enum {
 100         USB_XU_CLOCK_RATE               = 0xe301,
 101         USB_XU_CLOCK_SOURCE             = 0xe302,
 102         USB_XU_DIGITAL_IO_STATUS        = 0xe303,
 103         USB_XU_DEVICE_OPTIONS           = 0xe304,
 104         USB_XU_DIRECT_MONITORING        = 0xe305,
 105         USB_XU_METERING                 = 0xe306
 106 };
 107 enum {
 108         USB_XU_CLOCK_SOURCE_SELECTOR = 0x02,    /* clock source*/
 109         USB_XU_CLOCK_RATE_SELECTOR = 0x03,      /* clock rate */
 110         USB_XU_DIGITAL_FORMAT_SELECTOR = 0x01,  /* the spdif format */
 111         USB_XU_SOFT_LIMIT_SELECTOR = 0x03       /* soft limiter */
 112 };
 113
 114 /*
 115  * manual mapping of mixer names
 116  * if the mixer topology is too complicated and the parsed names are
 117  * ambiguous, add the entries in usbmixer_maps.c.
 118  */
 119 #include "mixer_maps.c"
 120
 121 static const struct usbmix_name_map *
 122 find_map(struct mixer_build *state, int unitid, int control)
 123 {
 124         const struct usbmix_name_map *p = state->map;
 125
 126         if (!p)
 127                 return NULL;
 128
 129         for (p = state->map; p->id; p++) {
 130                 if (p->id == unitid &&
 131                     (!control || !p->control || control == p->control))
 132                         return p;
 133         }
 134         return NULL;
 135 }
 136
 137 /* get the mapped name if the unit matches */
 138 static int
 139 check_mapped_name(const struct usbmix_name_map *p, char *buf, int buflen)
 140 {
 141         if (!p || !p->name)
 142                 return 0;
 143
 144         buflen--;
 145         return strlcpy(buf, p->name, buflen);
 146 }
 147
 148 /* check whether the control should be ignored */
 149 static inline int
 150 check_ignored_ctl(const struct usbmix_name_map *p)
 151 {
 152         if (!p || p->name || p->dB)
 153                 return 0;
 154         return 1;
 155 }
 156
 157 /* dB mapping */
 158 static inline void check_mapped_dB(const struct usbmix_name_map *p,
 159                                    struct usb_mixer_elem_info *cval)
 160 {
 161         if (p && p->dB) {
 162                 cval->dBmin = p->dB->min;
 163                 cval->dBmax = p->dB->max;
 164         }
 165 }
 166
 167 /* get the mapped selector source name */
 168 static int check_mapped_selector_name(struct mixer_build *state, int unitid,
 169                                       int index, char *buf, int buflen)
 170 {
 171         const struct usbmix_selector_map *p;
 172
 173         if (! state->selector_map)
 174                 return 0;
 175         for (p = state->selector_map; p->id; p++) {
 176                 if (p->id == unitid && index < p->count)
 177                         return strlcpy(buf, p->names[index], buflen);
 178         }
 179         return 0;
 180 }
 181
 182 /*
 183  * find an audio control unit with the given unit id
 184  */
 185 static void *find_audio_control_unit(struct mixer_build *state, unsigned char unit)
 186 {
 187         /* we just parse the header */
 188         struct uac_feature_unit_descriptor *hdr = NULL;
 189
 190         while ((hdr = snd_usb_find_desc(state->buffer, state->buflen, hdr,
 191                                         USB_DT_CS_INTERFACE)) != NULL) {
 192                 if (hdr->bLength >= 4 &&
 193                     hdr->bDescriptorSubtype >= UAC_INPUT_TERMINAL &&
 194                     hdr->bDescriptorSubtype <= UAC2_SAMPLE_RATE_CONVERTER &&
 195                     hdr->bUnitID == unit)
 196                         return hdr;
 197         }
 198
 199         return NULL;
 200 }
 201
 202 /*
 203  * copy a string with the given id
 204  */
 205 static int snd_usb_copy_string_desc(struct mixer_build *state, int index, char *buf, int maxlen)
 206 {
 207         int len = usb_string(state->chip->dev, index, buf, maxlen - 1);
 208         buf[len] = 0;
 209         return len;
 210 }
 211
 212 /*
 213  * convert from the byte/word on usb descriptor to the zero-based integer
 214  */
 215 static int convert_signed_value(struct usb_mixer_elem_info *cval, int val)
 216 {
 217         switch (cval->val_type) {
 218         case USB_MIXER_BOOLEAN:
 219                 return !!val;
 220         case USB_MIXER_INV_BOOLEAN:
 221                 return !val;
 222         case USB_MIXER_U8:
 223                 val &= 0xff;
 224                 break;
 225         case USB_MIXER_S8:
 226                 val &= 0xff;
 227                 if (val >= 0x80)
 228                         val -= 0x100;
 229                 break;
 230         case USB_MIXER_U16:
 231                 val &= 0xffff;
 232                 break;
 233         case USB_MIXER_S16:
 234                 val &= 0xffff;
 235                 if (val >= 0x8000)
 236                         val -= 0x10000;
 237                 break;
 238         }
 239         return val;
 240 }
 241
 242 /*
 243  * convert from the zero-based int to the byte/word for usb descriptor
 244  */
 245 static int convert_bytes_value(struct usb_mixer_elem_info *cval, int val)
 246 {
 247         switch (cval->val_type) {
 248         case USB_MIXER_BOOLEAN:
 249                 return !!val;
 250         case USB_MIXER_INV_BOOLEAN:
 251                 return !val;
 252         case USB_MIXER_S8:
 253         case USB_MIXER_U8:
 254                 return val & 0xff;
 255         case USB_MIXER_S16:
 256         case USB_MIXER_U16:
 257                 return val & 0xffff;
 258         }
 259         return 0; /* not reached */
 260 }
 261
 262 static int get_relative_value(struct usb_mixer_elem_info *cval, int val)
 263 {
 264         if (! cval->res)
 265                 cval->res = 1;
 266         if (val < cval->min)
 267                 return 0;
 268         else if (val >= cval->max)
 269                 return (cval->max - cval->min + cval->res - 1) / cval->res;
 270         else
 271                 return (val - cval->min) / cval->res;
 272 }
 273
 274 static int get_abs_value(struct usb_mixer_elem_info *cval, int val)
 275 {
 276         if (val < 0)
 277                 return cval->min;
 278         if (! cval->res)
 279                 cval->res = 1;
 280         val *= cval->res;
 281         val += cval->min;
 282         if (val > cval->max)
 283                 return cval->max;
 284         return val;
 285 }
 286
 287
 288 /*
 289  * retrieve a mixer value
 290  */
 291
 292 static int get_ctl_value_v1(struct usb_mixer_elem_info *cval, int request, int validx, int *value_ret)
 293 {
 294         struct snd_usb_audio *chip = cval->mixer->chip;
 295         unsigned char buf[2];
 296         int val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
 297         int timeout = 10;
 298
 299         while (timeout-- > 0) {
 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, snd_usb_ctrl_intf(chip) | (cval->id << 8),
 303                                     buf, val_len, 100) >= val_len) {
 304                         *value_ret = convert_signed_value(cval, snd_usb_combine_bytes(buf, val_len));
 305                         return 0;
 306                 }
 307         }
 308         snd_printdd(KERN_ERR "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
 309                     request, validx, snd_usb_ctrl_intf(chip) | (cval->id << 8), cval->val_type);
 310         return -EINVAL;
 311 }
 312
 313 static int get_ctl_value_v2(struct usb_mixer_elem_info *cval, int request, int validx, int *value_ret)
 314 {
 315         struct snd_usb_audio *chip = cval->mixer->chip;
 316         unsigned char buf[2 + 3*sizeof(__u16)]; /* enough space for one range */
 317         unsigned char *val;
 318         int ret, size;
 319         __u8 bRequest;
 320
 321         if (request == UAC_GET_CUR) {
 322                 bRequest = UAC2_CS_CUR;
 323                 size = sizeof(__u16);
 324         } else {
 325                 bRequest = UAC2_CS_RANGE;
 326                 size = sizeof(buf);
 327         }
 328
 329         memset(buf, 0, sizeof(buf));
 330
 331         ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), bRequest,
 332                               USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
 333                               validx, snd_usb_ctrl_intf(chip) | (cval->id << 8),
 334                               buf, size, 1000);
 335
 336         if (ret < 0) {
 337                 snd_printk(KERN_ERR "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
 338                            request, validx, snd_usb_ctrl_intf(chip) | (cval->id << 8), cval->val_type);
 339                 return ret;
 340         }
 341
 342         /* FIXME: how should we handle multiple triplets here? */
 343
 344         switch (request) {
 345         case UAC_GET_CUR:
 346                 val = buf;
 347                 break;
 348         case UAC_GET_MIN:
 349                 val = buf + sizeof(__u16);
 350                 break;
 351         case UAC_GET_MAX:
 352                 val = buf + sizeof(__u16) * 2;
 353                 break;
 354         case UAC_GET_RES:
 355                 val = buf + sizeof(__u16) * 3;
 356                 break;
 357         default:
 358                 return -EINVAL;
 359         }
 360
 361         *value_ret = convert_signed_value(cval, snd_usb_combine_bytes(val, sizeof(__u16)));
 362
 363         return 0;
 364 }
 365
 366 static int get_ctl_value(struct usb_mixer_elem_info *cval, int request, int validx, int *value_ret)
 367 {
 368         return (cval->mixer->protocol == UAC_VERSION_1) ?
 369                 get_ctl_value_v1(cval, request, validx, value_ret) :
 370                 get_ctl_value_v2(cval, request, validx, value_ret);
 371 }
 372
 373 static int get_cur_ctl_value(struct usb_mixer_elem_info *cval, int validx, int *value)
 374 {
 375         return get_ctl_value(cval, UAC_GET_CUR, validx, value);
 376 }
 377
 378 /* channel = 0: master, 1 = first channel */
 379 static inline int get_cur_mix_raw(struct usb_mixer_elem_info *cval,
 380                                   int channel, int *value)
 381 {
 382         return get_ctl_value(cval, UAC_GET_CUR, (cval->control << 8) | channel, value);
 383 }
 384
 385 static int get_cur_mix_value(struct usb_mixer_elem_info *cval,
 386                              int channel, int index, int *value)
 387 {
 388         int err;
 389
 390         if (cval->cached & (1 << channel)) {
 391                 *value = cval->cache_val[index];
 392                 return 0;
 393         }
 394         err = get_cur_mix_raw(cval, channel, value);
 395         if (err < 0) {
 396                 if (!cval->mixer->ignore_ctl_error)
 397                         snd_printd(KERN_ERR "cannot get current value for control %d ch %d: err = %d\n",
 398                                    cval->control, channel, err);
 399                 return err;
 400         }
 401         cval->cached |= 1 << channel;
 402         cval->cache_val[index] = *value;
 403         return 0;
 404 }
 405
 406
 407 /*
 408  * set a mixer value
 409  */
 410
 411 int snd_usb_mixer_set_ctl_value(struct usb_mixer_elem_info *cval,
 412                                 int request, int validx, int value_set)
 413 {
 414         struct snd_usb_audio *chip = cval->mixer->chip;
 415         unsigned char buf[2];
 416         int val_len, timeout = 10;
 417
 418         if (cval->mixer->protocol == UAC_VERSION_1) {
 419                 val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
 420         } else { /* UAC_VERSION_2 */
 421                 /* audio class v2 controls are always 2 bytes in size */
 422                 val_len = sizeof(__u16);
 423
 424                 /* FIXME */
 425                 if (request != UAC_SET_CUR) {
 426                         snd_printdd(KERN_WARNING "RANGE setting not yet supported\n");
 427                         return -EINVAL;
 428                 }
 429
 430                 request = UAC2_CS_CUR;
 431         }
 432
 433         value_set = convert_bytes_value(cval, value_set);
 434         buf[0] = value_set & 0xff;
 435         buf[1] = (value_set >> 8) & 0xff;
 436         while (timeout-- > 0)
 437                 if (snd_usb_ctl_msg(chip->dev,
 438                                     usb_sndctrlpipe(chip->dev, 0), request,
 439                                     USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
 440                                     validx, snd_usb_ctrl_intf(chip) | (cval->id << 8),
 441                                     buf, val_len, 100) >= 0)
 442                         return 0;
 443         snd_printdd(KERN_ERR "cannot set ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d, data = %#x/%#x\n",
 444                     request, validx, snd_usb_ctrl_intf(chip) | (cval->id << 8), cval->val_type, buf[0], buf[1]);
 445         return -EINVAL;
 446 }
 447
 448 static int set_cur_ctl_value(struct usb_mixer_elem_info *cval, int validx, int value)
 449 {
 450         return snd_usb_mixer_set_ctl_value(cval, UAC_SET_CUR, validx, value);
 451 }
 452
 453 static int set_cur_mix_value(struct usb_mixer_elem_info *cval, int channel,
 454                              int index, int value)
 455 {
 456         int err;
 457         unsigned int read_only = (channel == 0) ?
 458                 cval->master_readonly :
 459                 cval->ch_readonly & (1 << (channel - 1));
 460
 461         if (read_only) {
 462                 snd_printdd(KERN_INFO "%s(): channel %d of control %d is read_only\n",
 463                             __func__, channel, cval->control);
 464                 return 0;
 465         }
 466
 467         err = snd_usb_mixer_set_ctl_value(cval, UAC_SET_CUR, (cval->control << 8) | channel,
 468                             value);
 469         if (err < 0)
 470                 return err;
 471         cval->cached |= 1 << channel;
 472         cval->cache_val[index] = value;
 473         return 0;
 474 }
 475
 476 /*
 477  * TLV callback for mixer volume controls
 478  */
 479 static int mixer_vol_tlv(struct snd_kcontrol *kcontrol, int op_flag,
 480                          unsigned int size, unsigned int __user *_tlv)
 481 {
 482         struct usb_mixer_elem_info *cval = kcontrol->private_data;
 483         DECLARE_TLV_DB_MINMAX(scale, 0, 0);
 484
 485         if (size < sizeof(scale))
 486                 return -ENOMEM;
 487         scale[2] = cval->dBmin;
 488         scale[3] = cval->dBmax;
 489         if (copy_to_user(_tlv, scale, sizeof(scale)))
 490                 return -EFAULT;
 491         return 0;
 492 }
 493
 494 /*
 495  * parser routines begin here...
 496  */
 497
 498 static int parse_audio_unit(struct mixer_build *state, int unitid);
 499
 500
 501 /*
 502  * check if the input/output channel routing is enabled on the given bitmap.
 503  * used for mixer unit parser
 504  */
 505 static int check_matrix_bitmap(unsigned char *bmap, int ich, int och, int num_outs)
 506 {
 507         int idx = ich * num_outs + och;
 508         return bmap[idx >> 3] & (0x80 >> (idx & 7));
 509 }
 510
 511
 512 /*
 513  * add an alsa control element
 514  * search and increment the index until an empty slot is found.
 515  *
 516  * if failed, give up and free the control instance.
 517  */
 518
 519 static int add_control_to_empty(struct mixer_build *state, struct snd_kcontrol *kctl)
 520 {
 521         struct usb_mixer_elem_info *cval = kctl->private_data;
 522         int err;
 523
 524         while (snd_ctl_find_id(state->chip->card, &kctl->id))
 525                 kctl->id.index++;
 526         if ((err = snd_ctl_add(state->chip->card, kctl)) < 0) {
 527                 snd_printd(KERN_ERR "cannot add control (err = %d)\n", err);
 528                 return err;
 529         }
 530         cval->elem_id = &kctl->id;
 531         cval->next_id_elem = state->mixer->id_elems[cval->id];
 532         state->mixer->id_elems[cval->id] = cval;
 533         return 0;
 534 }
 535
 536
 537 /*
 538  * get a terminal name string
 539  */
 540
 541 static struct iterm_name_combo {
 542         int type;
 543         char *name;
 544 } iterm_names[] = {
 545         { 0x0300, "Output" },
 546         { 0x0301, "Speaker" },
 547         { 0x0302, "Headphone" },
 548         { 0x0303, "HMD Audio" },
 549         { 0x0304, "Desktop Speaker" },
 550         { 0x0305, "Room Speaker" },
 551         { 0x0306, "Com Speaker" },
 552         { 0x0307, "LFE" },
 553         { 0x0600, "External In" },
 554         { 0x0601, "Analog In" },
 555         { 0x0602, "Digital In" },
 556         { 0x0603, "Line" },
 557         { 0x0604, "Legacy In" },
 558         { 0x0605, "IEC958 In" },
 559         { 0x0606, "1394 DA Stream" },
 560         { 0x0607, "1394 DV Stream" },
 561         { 0x0700, "Embedded" },
 562         { 0x0701, "Noise Source" },
 563         { 0x0702, "Equalization Noise" },
 564         { 0x0703, "CD" },
 565         { 0x0704, "DAT" },
 566         { 0x0705, "DCC" },
 567         { 0x0706, "MiniDisk" },
 568         { 0x0707, "Analog Tape" },
 569         { 0x0708, "Phonograph" },
 570         { 0x0709, "VCR Audio" },
 571         { 0x070a, "Video Disk Audio" },
 572         { 0x070b, "DVD Audio" },
 573         { 0x070c, "TV Tuner Audio" },
 574         { 0x070d, "Satellite Rec Audio" },
 575         { 0x070e, "Cable Tuner Audio" },
 576         { 0x070f, "DSS Audio" },
 577         { 0x0710, "Radio Receiver" },
 578         { 0x0711, "Radio Transmitter" },
 579         { 0x0712, "Multi-Track Recorder" },
 580         { 0x0713, "Synthesizer" },
 581         { 0 },
 582 };
 583
 584 static int get_term_name(struct mixer_build *state, struct usb_audio_term *iterm,
 585                          unsigned char *name, int maxlen, int term_only)
 586 {
 587         struct iterm_name_combo *names;
 588
 589         if (iterm->name)
 590                 return snd_usb_copy_string_desc(state, iterm->name, name, maxlen);
 591
 592         /* virtual type - not a real terminal */
 593         if (iterm->type >> 16) {
 594                 if (term_only)
 595                         return 0;
 596                 switch (iterm->type >> 16) {
 597                 case UAC_SELECTOR_UNIT:
 598                         strcpy(name, "Selector"); return 8;
 599                 case UAC1_PROCESSING_UNIT:
 600                         strcpy(name, "Process Unit"); return 12;
 601                 case UAC1_EXTENSION_UNIT:
 602                         strcpy(name, "Ext Unit"); return 8;
 603                 case UAC_MIXER_UNIT:
 604                         strcpy(name, "Mixer"); return 5;
 605                 default:
 606                         return sprintf(name, "Unit %d", iterm->id);
 607                 }
 608         }
 609
 610         switch (iterm->type & 0xff00) {
 611         case 0x0100:
 612                 strcpy(name, "PCM"); return 3;
 613         case 0x0200:
 614                 strcpy(name, "Mic"); return 3;
 615         case 0x0400:
 616                 strcpy(name, "Headset"); return 7;
 617         case 0x0500:
 618                 strcpy(name, "Phone"); return 5;
 619         }
 620
 621         for (names = iterm_names; names->type; names++)
 622                 if (names->type == iterm->type) {
 623                         strcpy(name, names->name);
 624                         return strlen(names->name);
 625                 }
 626         return 0;
 627 }
 628
 629
 630 /*
 631  * parse the source unit recursively until it reaches to a terminal
 632  * or a branched unit.
 633  */
 634 static int check_input_term(struct mixer_build *state, int id, struct usb_audio_term *term)
 635 {
 636         int err;
 637         void *p1;
 638
 639         memset(term, 0, sizeof(*term));
 640         while ((p1 = find_audio_control_unit(state, id)) != NULL) {
 641                 unsigned char *hdr = p1;
 642                 term->id = id;
 643                 switch (hdr[2]) {
 644                 case UAC_INPUT_TERMINAL:
 645                         if (state->mixer->protocol == UAC_VERSION_1) {
 646                                 struct uac_input_terminal_descriptor *d = p1;
 647                                 term->type = le16_to_cpu(d->wTerminalType);
 648                                 term->channels = d->bNrChannels;
 649                                 term->chconfig = le16_to_cpu(d->wChannelConfig);
 650                                 term->name = d->iTerminal;
 651                         } else { /* UAC_VERSION_2 */
 652                                 struct uac2_input_terminal_descriptor *d = p1;
 653                                 term->type = le16_to_cpu(d->wTerminalType);
 654                                 term->channels = d->bNrChannels;
 655                                 term->chconfig = le32_to_cpu(d->bmChannelConfig);
 656                                 term->name = d->iTerminal;
 657
 658                                 /* call recursively to get the clock selectors */
 659                                 err = check_input_term(state, d->bCSourceID, term);
 660                                 if (err < 0)
 661                                         return err;
 662                         }
 663                         return 0;
 664                 case UAC_FEATURE_UNIT: {
 665                         /* the header is the same for v1 and v2 */
 666                         struct uac_feature_unit_descriptor *d = p1;
 667                         id = d->bSourceID;
 668                         break; /* continue to parse */
 669                 }
 670                 case UAC_MIXER_UNIT: {
 671                         struct uac_mixer_unit_descriptor *d = p1;
 672                         term->type = d->bDescriptorSubtype << 16; /* virtual type */
 673                         term->channels = uac_mixer_unit_bNrChannels(d);
 674                         term->chconfig = uac_mixer_unit_wChannelConfig(d, state->mixer->protocol);
 675                         term->name = uac_mixer_unit_iMixer(d);
 676                         return 0;
 677                 }
 678                 case UAC_SELECTOR_UNIT:
 679                 case UAC2_CLOCK_SELECTOR: {
 680                         struct uac_selector_unit_descriptor *d = p1;
 681                         /* call recursively to retrieve the channel info */
 682                         if (check_input_term(state, d->baSourceID[0], term) < 0)
 683                                 return -ENODEV;
 684                         term->type = d->bDescriptorSubtype << 16; /* virtual type */
 685                         term->id = id;
 686                         term->name = uac_selector_unit_iSelector(d);
 687                         return 0;
 688                 }
 689                 case UAC1_PROCESSING_UNIT:
 690                 case UAC1_EXTENSION_UNIT: {
 691                         struct uac_processing_unit_descriptor *d = p1;
 692                         if (d->bNrInPins) {
 693                                 id = d->baSourceID[0];
 694                                 break; /* continue to parse */
 695                         }
 696                         term->type = d->bDescriptorSubtype << 16; /* virtual type */
 697                         term->channels = uac_processing_unit_bNrChannels(d);
 698                         term->chconfig = uac_processing_unit_wChannelConfig(d, state->mixer->protocol);
 699                         term->name = uac_processing_unit_iProcessing(d, state->mixer->protocol);
 700                         return 0;
 701                 }
 702                 case UAC2_CLOCK_SOURCE: {
 703                         struct uac_clock_source_descriptor *d = p1;
 704                         term->type = d->bDescriptorSubtype << 16; /* virtual type */
 705                         term->id = id;
 706                         term->name = d->iClockSource;
 707                         return 0;
 708                 }
 709                 default:
 710                         return -ENODEV;
 711                 }
 712         }
 713         return -ENODEV;
 714 }
 715
 716
 717 /*
 718  * Feature Unit
 719  */
 720
 721 /* feature unit control information */
 722 struct usb_feature_control_info {
 723         const char *name;
 724         unsigned int type;      /* control type (mute, volume, etc.) */
 725 };
 726
 727 static struct usb_feature_control_info audio_feature_info[] = {
 728         { "Mute",                       USB_MIXER_INV_BOOLEAN },
 729         { "Volume",                     USB_MIXER_S16 },
 730         { "Tone Control - Bass",        USB_MIXER_S8 },
 731         { "Tone Control - Mid",         USB_MIXER_S8 },
 732         { "Tone Control - Treble",      USB_MIXER_S8 },
 733         { "Graphic Equalizer",          USB_MIXER_S8 }, /* FIXME: not implemeted yet */
 734         { "Auto Gain Control",          USB_MIXER_BOOLEAN },
 735         { "Delay Control",              USB_MIXER_U16 },
 736         { "Bass Boost",                 USB_MIXER_BOOLEAN },
 737         { "Loudness",                   USB_MIXER_BOOLEAN },
 738         /* UAC2 specific */
 739         { "Input Gain Control",         USB_MIXER_U16 },
 740         { "Input Gain Pad Control",     USB_MIXER_BOOLEAN },
 741         { "Phase Inverter Control",     USB_MIXER_BOOLEAN },
 742 };
 743
 744
 745 /* private_free callback */
 746 static void usb_mixer_elem_free(struct snd_kcontrol *kctl)
 747 {
 748         kfree(kctl->private_data);
 749         kctl->private_data = NULL;
 750 }
 751
 752
 753 /*
 754  * interface to ALSA control for feature/mixer units
 755  */
 756
 757 /*
 758  * retrieve the minimum and maximum values for the specified control
 759  */
 760 static int get_min_max(struct usb_mixer_elem_info *cval, int default_min)
 761 {
 762         struct snd_usb_audio *chip = cval->mixer->chip;
 763
 764         /* for failsafe */
 765         cval->min = default_min;
 766         cval->max = cval->min + 1;
 767         cval->res = 1;
 768         cval->dBmin = cval->dBmax = 0;
 769
 770         if (cval->val_type == USB_MIXER_BOOLEAN ||
 771             cval->val_type == USB_MIXER_INV_BOOLEAN) {
 772                 cval->initialized = 1;
 773         } else {
 774                 int minchn = 0;
 775                 if (cval->cmask) {
 776                         int i;
 777                         for (i = 0; i < MAX_CHANNELS; i++)
 778                                 if (cval->cmask & (1 << i)) {
 779                                         minchn = i + 1;
 780                                         break;
 781                                 }
 782                 }
 783                 if (get_ctl_value(cval, UAC_GET_MAX, (cval->control << 8) | minchn, &cval->max) < 0 ||
 784                     get_ctl_value(cval, UAC_GET_MIN, (cval->control << 8) | minchn, &cval->min) < 0) {
 785                         snd_printd(KERN_ERR "%d:%d: cannot get min/max values for control %d (id %d)\n",
 786                                    cval->id, snd_usb_ctrl_intf(chip), cval->control, cval->id);
 787                         return -EINVAL;
 788                 }
 789                 if (get_ctl_value(cval, UAC_GET_RES, (cval->control << 8) | minchn, &cval->res) < 0) {
 790                         cval->res = 1;
 791                 } else {
 792                         int last_valid_res = cval->res;
 793
 794                         while (cval->res > 1) {
 795                                 if (snd_usb_mixer_set_ctl_value(cval, UAC_SET_RES,
 796                                                                 (cval->control << 8) | minchn, cval->res / 2) < 0)
 797                                         break;
 798                                 cval->res /= 2;
 799                         }
 800                         if (get_ctl_value(cval, UAC_GET_RES, (cval->control << 8) | minchn, &cval->res) < 0)
 801                                 cval->res = last_valid_res;
 802                 }
 803                 if (cval->res == 0)
 804                         cval->res = 1;
 805
 806                 /* Additional checks for the proper resolution
 807                  *
 808                  * Some devices report smaller resolutions than actually
 809                  * reacting.  They don't return errors but simply clip
 810                  * to the lower aligned value.
 811                  */
 812                 if (cval->min + cval->res < cval->max) {
 813                         int last_valid_res = cval->res;
 814                         int saved, test, check;
 815                         get_cur_mix_raw(cval, minchn, &saved);
 816                         for (;;) {
 817                                 test = saved;
 818                                 if (test < cval->max)
 819                                         test += cval->res;
 820                                 else
 821                                         test -= cval->res;
 822                                 if (test < cval->min || test > cval->max ||
 823                                     set_cur_mix_value(cval, minchn, 0, test) ||
 824                                     get_cur_mix_raw(cval, minchn, &check)) {
 825                                         cval->res = last_valid_res;
 826                                         break;
 827                                 }
 828                                 if (test == check)
 829                                         break;
 830                                 cval->res *= 2;
 831                         }
 832                         set_cur_mix_value(cval, minchn, 0, saved);
 833                 }
 834
 835                 cval->initialized = 1;
 836         }
 837
 838         /* USB descriptions contain the dB scale in 1/256 dB unit
 839          * while ALSA TLV contains in 1/100 dB unit
 840          */
 841         cval->dBmin = (convert_signed_value(cval, cval->min) * 100) / 256;
 842         cval->dBmax = (convert_signed_value(cval, cval->max) * 100) / 256;
 843         if (cval->dBmin > cval->dBmax) {
 844                 /* something is wrong; assume it's either from/to 0dB */
 845                 if (cval->dBmin < 0)
 846                         cval->dBmax = 0;
 847                 else if (cval->dBmin > 0)
 848                         cval->dBmin = 0;
 849                 if (cval->dBmin > cval->dBmax) {
 850                         /* totally crap, return an error */
 851                         return -EINVAL;
 852                 }
 853         }
 854
 855         return 0;
 856 }
 857
 858
 859 /* get a feature/mixer unit info */
 860 static int mixer_ctl_feature_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
 861 {
 862         struct usb_mixer_elem_info *cval = kcontrol->private_data;
 863
 864         if (cval->val_type == USB_MIXER_BOOLEAN ||
 865             cval->val_type == USB_MIXER_INV_BOOLEAN)
 866                 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
 867         else
 868                 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 869         uinfo->count = cval->channels;
 870         if (cval->val_type == USB_MIXER_BOOLEAN ||
 871             cval->val_type == USB_MIXER_INV_BOOLEAN) {
 872                 uinfo->value.integer.min = 0;
 873                 uinfo->value.integer.max = 1;
 874         } else {
 875                 if (! cval->initialized)
 876                         get_min_max(cval,  0);
 877                 uinfo->value.integer.min = 0;
 878                 uinfo->value.integer.max =
 879                         (cval->max - cval->min + cval->res - 1) / cval->res;
 880         }
 881         return 0;
 882 }
 883
 884 /* get the current value from feature/mixer unit */
 885 static int mixer_ctl_feature_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
 886 {
 887         struct usb_mixer_elem_info *cval = kcontrol->private_data;
 888         int c, cnt, val, err;
 889
 890         ucontrol->value.integer.value[0] = cval->min;
 891         if (cval->cmask) {
 892                 cnt = 0;
 893                 for (c = 0; c < MAX_CHANNELS; c++) {
 894                         if (!(cval->cmask & (1 << c)))
 895                                 continue;
 896                         err = get_cur_mix_value(cval, c + 1, cnt, &val);
 897                         if (err < 0)
 898                                 return cval->mixer->ignore_ctl_error ? 0 : err;
 899                         val = get_relative_value(cval, val);
 900                         ucontrol->value.integer.value[cnt] = val;
 901                         cnt++;
 902                 }
 903                 return 0;
 904         } else {
 905                 /* master channel */
 906                 err = get_cur_mix_value(cval, 0, 0, &val);
 907                 if (err < 0)
 908                         return cval->mixer->ignore_ctl_error ? 0 : err;
 909                 val = get_relative_value(cval, val);
 910                 ucontrol->value.integer.value[0] = val;
 911         }
 912         return 0;
 913 }
 914
 915 /* put the current value to feature/mixer unit */
 916 static int mixer_ctl_feature_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
 917 {
 918         struct usb_mixer_elem_info *cval = kcontrol->private_data;
 919         int c, cnt, val, oval, err;
 920         int changed = 0;
 921
 922         if (cval->cmask) {
 923                 cnt = 0;
 924                 for (c = 0; c < MAX_CHANNELS; c++) {
 925                         if (!(cval->cmask & (1 << c)))
 926                                 continue;
 927                         err = get_cur_mix_value(cval, c + 1, cnt, &oval);
 928                         if (err < 0)
 929                                 return cval->mixer->ignore_ctl_error ? 0 : err;
 930                         val = ucontrol->value.integer.value[cnt];
 931                         val = get_abs_value(cval, val);
 932                         if (oval != val) {
 933                                 set_cur_mix_value(cval, c + 1, cnt, val);
 934                                 changed = 1;
 935                         }
 936                         cnt++;
 937                 }
 938         } else {
 939                 /* master channel */
 940                 err = get_cur_mix_value(cval, 0, 0, &oval);
 941                 if (err < 0)
 942                         return cval->mixer->ignore_ctl_error ? 0 : err;
 943                 val = ucontrol->value.integer.value[0];
 944                 val = get_abs_value(cval, val);
 945                 if (val != oval) {
 946                         set_cur_mix_value(cval, 0, 0, val);
 947                         changed = 1;
 948                 }
 949         }
 950         return changed;
 951 }
 952
 953 static struct snd_kcontrol_new usb_feature_unit_ctl = {
 954         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 955         .name = "", /* will be filled later manually */
 956         .info = mixer_ctl_feature_info,
 957         .get = mixer_ctl_feature_get,
 958         .put = mixer_ctl_feature_put,
 959 };
 960
 961 /* the read-only variant */
 962 static struct snd_kcontrol_new usb_feature_unit_ctl_ro = {
 963         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 964         .name = "", /* will be filled later manually */
 965         .info = mixer_ctl_feature_info,
 966         .get = mixer_ctl_feature_get,
 967         .put = NULL,
 968 };
 969
 970
 971 /*
 972  * build a feature control
 973  */
 974
 975 static size_t append_ctl_name(struct snd_kcontrol *kctl, const char *str)
 976 {
 977         return strlcat(kctl->id.name, str, sizeof(kctl->id.name));
 978 }
 979
 980 static void build_feature_ctl(struct mixer_build *state, void *raw_desc,
 981                               unsigned int ctl_mask, int control,
 982                               struct usb_audio_term *iterm, int unitid,
 983                               int readonly_mask)
 984 {
 985         struct uac_feature_unit_descriptor *desc = raw_desc;
 986         unsigned int len = 0;
 987         int mapped_name = 0;
 988         int nameid = uac_feature_unit_iFeature(desc);
 989         struct snd_kcontrol *kctl;
 990         struct usb_mixer_elem_info *cval;
 991         const struct usbmix_name_map *map;
 992
 993         control++; /* change from zero-based to 1-based value */
 994
 995         if (control == UAC_FU_GRAPHIC_EQUALIZER) {
 996                 /* FIXME: not supported yet */
 997                 return;
 998         }
 999
1000         map = find_map(state, unitid, control);
1001         if (check_ignored_ctl(map))
1002                 return;
1003
1004         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1005         if (! cval) {
1006                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1007                 return;
1008         }
1009         cval->mixer = state->mixer;
1010         cval->id = unitid;
1011         cval->control = control;
1012         cval->cmask = ctl_mask;
1013         cval->val_type = audio_feature_info[control-1].type;
1014         if (ctl_mask == 0) {
1015                 cval->channels = 1;     /* master channel */
1016                 cval->master_readonly = readonly_mask;
1017         } else {
1018                 int i, c = 0;
1019                 for (i = 0; i < 16; i++)
1020                         if (ctl_mask & (1 << i))
1021                                 c++;
1022                 cval->channels = c;
1023                 cval->ch_readonly = readonly_mask;
1024         }
1025
1026         /* get min/max values */
1027         get_min_max(cval, 0);
1028
1029         /* if all channels in the mask are marked read-only, make the control
1030          * read-only. set_cur_mix_value() will check the mask again and won't
1031          * issue write commands to read-only channels. */
1032         if (cval->channels == readonly_mask)
1033                 kctl = snd_ctl_new1(&usb_feature_unit_ctl_ro, cval);
1034         else
1035                 kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
1036
1037         if (! kctl) {
1038                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1039                 kfree(cval);
1040                 return;
1041         }
1042         kctl->private_free = usb_mixer_elem_free;
1043
1044         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
1045         mapped_name = len != 0;
1046         if (! len && nameid)
1047                 len = snd_usb_copy_string_desc(state, nameid,
1048                                 kctl->id.name, sizeof(kctl->id.name));
1049
1050         switch (control) {
1051         case UAC_FU_MUTE:
1052         case UAC_FU_VOLUME:
1053                 /* determine the control name.  the rule is:
1054                  * - if a name id is given in descriptor, use it.
1055                  * - if the connected input can be determined, then use the name
1056                  *   of terminal type.
1057                  * - if the connected output can be determined, use it.
1058                  * - otherwise, anonymous name.
1059                  */
1060                 if (! len) {
1061                         len = get_term_name(state, iterm, kctl->id.name, sizeof(kctl->id.name), 1);
1062                         if (! len)
1063                                 len = get_term_name(state, &state->oterm, kctl->id.name, sizeof(kctl->id.name), 1);
1064                         if (! len)
1065                                 len = snprintf(kctl->id.name, sizeof(kctl->id.name),
1066                                                "Feature %d", unitid);
1067                 }
1068                 /* determine the stream direction:
1069                  * if the connected output is USB stream, then it's likely a
1070                  * capture stream.  otherwise it should be playback (hopefully :)
1071                  */
1072                 if (! mapped_name && ! (state->oterm.type >> 16)) {
1073                         if ((state->oterm.type & 0xff00) == 0x0100) {
1074                                 len = append_ctl_name(kctl, " Capture");
1075                         } else {
1076                                 len = append_ctl_name(kctl, " Playback");
1077                         }
1078                 }
1079                 append_ctl_name(kctl, control == UAC_FU_MUTE ?
1080                                 " Switch" : " Volume");
1081                 if (control == UAC_FU_VOLUME) {
1082                         kctl->tlv.c = mixer_vol_tlv;
1083                         kctl->vd[0].access |=
1084                                 SNDRV_CTL_ELEM_ACCESS_TLV_READ |
1085                                 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
1086                         check_mapped_dB(map, cval);
1087                 }
1088                 break;
1089
1090         default:
1091                 if (! len)
1092                         strlcpy(kctl->id.name, audio_feature_info[control-1].name,
1093                                 sizeof(kctl->id.name));
1094                 break;
1095         }
1096
1097         /* volume control quirks */
1098         switch (state->chip->usb_id) {
1099         case USB_ID(0x0471, 0x0101):
1100         case USB_ID(0x0471, 0x0104):
1101         case USB_ID(0x0471, 0x0105):
1102         case USB_ID(0x0672, 0x1041):
1103         /* quirk for UDA1321/N101.
1104          * note that detection between firmware 2.1.1.7 (N101)
1105          * and later 2.1.1.21 is not very clear from datasheets.
1106          * I hope that the min value is -15360 for newer firmware --jk
1107          */
1108                 if (!strcmp(kctl->id.name, "PCM Playback Volume") &&
1109                     cval->min == -15616) {
1110                         snd_printk(KERN_INFO
1111                                  "set volume quirk for UDA1321/N101 chip\n");
1112                         cval->max = -256;
1113                 }
1114                 break;
1115
1116         case USB_ID(0x046d, 0x09a4):
1117                 if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
1118                         snd_printk(KERN_INFO
1119                                 "set volume quirk for QuickCam E3500\n");
1120                         cval->min = 6080;
1121                         cval->max = 8768;
1122                         cval->res = 192;
1123                 }
1124                 break;
1125
1126         case USB_ID(0x046d, 0x0809):
1127         case USB_ID(0x046d, 0x0991):
1128         /* Most audio usb devices lie about volume resolution.
1129          * Most Logitech webcams have res = 384.
1130          * Proboly there is some logitech magic behind this number --fishor
1131          */
1132                 if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
1133                         snd_printk(KERN_INFO
1134                                 "set resolution quirk: cval->res = 384\n");
1135                         cval->res = 384;
1136                 }
1137                 break;
1138
1139         }
1140
1141         snd_printdd(KERN_INFO "[%d] FU [%s] ch = %d, val = %d/%d/%d\n",
1142                     cval->id, kctl->id.name, cval->channels, cval->min, cval->max, cval->res);
1143         add_control_to_empty(state, kctl);
1144 }
1145
1146
1147
1148 /*
1149  * parse a feature unit
1150  *
1151  * most of controlls are defined here.
1152  */
1153 static int parse_audio_feature_unit(struct mixer_build *state, int unitid, void *_ftr)
1154 {
1155         int channels, i, j;
1156         struct usb_audio_term iterm;
1157         unsigned int master_bits, first_ch_bits;
1158         int err, csize;
1159         struct uac_feature_unit_descriptor *hdr = _ftr;
1160         __u8 *bmaControls;
1161
1162         if (state->mixer->protocol == UAC_VERSION_1) {
1163                 csize = hdr->bControlSize;
1164                 channels = (hdr->bLength - 7) / csize - 1;
1165                 bmaControls = hdr->bmaControls;
1166         } else {
1167                 struct uac2_feature_unit_descriptor *ftr = _ftr;
1168                 csize = 4;
1169                 channels = (hdr->bLength - 6) / 4 - 1;
1170                 bmaControls = ftr->bmaControls;
1171         }
1172
1173         if (hdr->bLength < 7 || !csize || hdr->bLength < 7 + csize) {
1174                 snd_printk(KERN_ERR "usbaudio: unit %u: invalid UAC_FEATURE_UNIT descriptor\n", unitid);
1175                 return -EINVAL;
1176         }
1177
1178         /* parse the source unit */
1179         if ((err = parse_audio_unit(state, hdr->bSourceID)) < 0)
1180                 return err;
1181
1182         /* determine the input source type and name */
1183         if (check_input_term(state, hdr->bSourceID, &iterm) < 0)
1184                 return -EINVAL;
1185
1186         master_bits = snd_usb_combine_bytes(bmaControls, csize);
1187         /* master configuration quirks */
1188         switch (state->chip->usb_id) {
1189         case USB_ID(0x08bb, 0x2702):
1190                 snd_printk(KERN_INFO
1191                            "usbmixer: master volume quirk for PCM2702 chip\n");
1192                 /* disable non-functional volume control */
1193                 master_bits &= ~UAC_CONTROL_BIT(UAC_FU_VOLUME);
1194                 break;
1195         }
1196         if (channels > 0)
1197                 first_ch_bits = snd_usb_combine_bytes(bmaControls + csize, csize);
1198         else
1199                 first_ch_bits = 0;
1200
1201         if (state->mixer->protocol == UAC_VERSION_1) {
1202                 /* check all control types */
1203                 for (i = 0; i < 10; i++) {
1204                         unsigned int ch_bits = 0;
1205                         for (j = 0; j < channels; j++) {
1206                                 unsigned int mask = snd_usb_combine_bytes(bmaControls + csize * (j+1), csize);
1207                                 if (mask & (1 << i))
1208                                         ch_bits |= (1 << j);
1209                         }
1210                         /* audio class v1 controls are never read-only */
1211                         if (ch_bits & 1) /* the first channel must be set (for ease of programming) */
1212                                 build_feature_ctl(state, _ftr, ch_bits, i, &iterm, unitid, 0);
1213                         if (master_bits & (1 << i))
1214                                 build_feature_ctl(state, _ftr, 0, i, &iterm, unitid, 0);
1215                 }
1216         } else { /* UAC_VERSION_2 */
1217                 for (i = 0; i < 30/2; i++) {
1218                         unsigned int ch_bits = 0;
1219                         unsigned int ch_read_only = 0;
1220
1221                         for (j = 0; j < channels; j++) {
1222                                 unsigned int mask = snd_usb_combine_bytes(bmaControls + csize * (j+1), csize);
1223                                 if (uac2_control_is_readable(mask, i)) {
1224                                         ch_bits |= (1 << j);
1225                                         if (!uac2_control_is_writeable(mask, i))
1226                                                 ch_read_only |= (1 << j);
1227                                 }
1228                         }
1229
1230                         /* NOTE: build_feature_ctl() will mark the control read-only if all channels
1231                          * are marked read-only in the descriptors. Otherwise, the control will be
1232                          * reported as writeable, but the driver will not actually issue a write
1233                          * command for read-only channels */
1234                         if (ch_bits & 1) /* the first channel must be set (for ease of programming) */
1235                                 build_feature_ctl(state, _ftr, ch_bits, i, &iterm, unitid, ch_read_only);
1236                         if (uac2_control_is_readable(master_bits, i))
1237                                 build_feature_ctl(state, _ftr, 0, i, &iterm, unitid,
1238                                                   !uac2_control_is_writeable(master_bits, i));
1239                 }
1240         }
1241
1242         return 0;
1243 }
1244
1245
1246 /*
1247  * Mixer Unit
1248  */
1249
1250 /*
1251  * build a mixer unit control
1252  *
1253  * the callbacks are identical with feature unit.
1254  * input channel number (zero based) is given in control field instead.
1255  */
1256
1257 static void build_mixer_unit_ctl(struct mixer_build *state,
1258                                  struct uac_mixer_unit_descriptor *desc,
1259                                  int in_pin, int in_ch, int unitid,
1260                                  struct usb_audio_term *iterm)
1261 {
1262         struct usb_mixer_elem_info *cval;
1263         unsigned int num_outs = uac_mixer_unit_bNrChannels(desc);
1264         unsigned int i, len;
1265         struct snd_kcontrol *kctl;
1266         const struct usbmix_name_map *map;
1267
1268         map = find_map(state, unitid, 0);
1269         if (check_ignored_ctl(map))
1270                 return;
1271
1272         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1273         if (! cval)
1274                 return;
1275
1276         cval->mixer = state->mixer;
1277         cval->id = unitid;
1278         cval->control = in_ch + 1; /* based on 1 */
1279         cval->val_type = USB_MIXER_S16;
1280         for (i = 0; i < num_outs; i++) {
1281                 if (check_matrix_bitmap(uac_mixer_unit_bmControls(desc, state->mixer->protocol), in_ch, i, num_outs)) {
1282                         cval->cmask |= (1 << i);
1283                         cval->channels++;
1284                 }
1285         }
1286
1287         /* get min/max values */
1288         get_min_max(cval, 0);
1289
1290         kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
1291         if (! kctl) {
1292                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1293                 kfree(cval);
1294                 return;
1295         }
1296         kctl->private_free = usb_mixer_elem_free;
1297
1298         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
1299         if (! len)
1300                 len = get_term_name(state, iterm, kctl->id.name, sizeof(kctl->id.name), 0);
1301         if (! len)
1302                 len = sprintf(kctl->id.name, "Mixer Source %d", in_ch + 1);
1303         append_ctl_name(kctl, " Volume");
1304
1305         snd_printdd(KERN_INFO "[%d] MU [%s] ch = %d, val = %d/%d\n",
1306                     cval->id, kctl->id.name, cval->channels, cval->min, cval->max);
1307         add_control_to_empty(state, kctl);
1308 }
1309
1310
1311 /*
1312  * parse a mixer unit
1313  */
1314 static int parse_audio_mixer_unit(struct mixer_build *state, int unitid, void *raw_desc)
1315 {
1316         struct uac_mixer_unit_descriptor *desc = raw_desc;
1317         struct usb_audio_term iterm;
1318         int input_pins, num_ins, num_outs;
1319         int pin, ich, err;
1320
1321         if (desc->bLength < 11 || ! (input_pins = desc->bNrInPins) || ! (num_outs = uac_mixer_unit_bNrChannels(desc))) {
1322                 snd_printk(KERN_ERR "invalid MIXER UNIT descriptor %d\n", unitid);
1323                 return -EINVAL;
1324         }
1325         /* no bmControls field (e.g. Maya44) -> ignore */
1326         if (desc->bLength <= 10 + input_pins) {
1327                 snd_printdd(KERN_INFO "MU %d has no bmControls field\n", unitid);
1328                 return 0;
1329         }
1330
1331         num_ins = 0;
1332         ich = 0;
1333         for (pin = 0; pin < input_pins; pin++) {
1334                 err = parse_audio_unit(state, desc->baSourceID[pin]);
1335                 if (err < 0)
1336                         return err;
1337                 err = check_input_term(state, desc->baSourceID[pin], &iterm);
1338                 if (err < 0)
1339                         return err;
1340                 num_ins += iterm.channels;
1341                 for (; ich < num_ins; ++ich) {
1342                         int och, ich_has_controls = 0;
1343
1344                         for (och = 0; och < num_outs; ++och) {
1345                                 if (check_matrix_bitmap(uac_mixer_unit_bmControls(desc, state->mixer->protocol),
1346                                                         ich, och, num_outs)) {
1347                                         ich_has_controls = 1;
1348                                         break;
1349                                 }
1350                         }
1351                         if (ich_has_controls)
1352                                 build_mixer_unit_ctl(state, desc, pin, ich,
1353                                                      unitid, &iterm);
1354                 }
1355         }
1356         return 0;
1357 }
1358
1359
1360 /*
1361  * Processing Unit / Extension Unit
1362  */
1363
1364 /* get callback for processing/extension unit */
1365 static int mixer_ctl_procunit_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1366 {
1367         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1368         int err, val;
1369
1370         err = get_cur_ctl_value(cval, cval->control << 8, &val);
1371         if (err < 0 && cval->mixer->ignore_ctl_error) {
1372                 ucontrol->value.integer.value[0] = cval->min;
1373                 return 0;
1374         }
1375         if (err < 0)
1376                 return err;
1377         val = get_relative_value(cval, val);
1378         ucontrol->value.integer.value[0] = val;
1379         return 0;
1380 }
1381
1382 /* put callback for processing/extension unit */
1383 static int mixer_ctl_procunit_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1384 {
1385         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1386         int val, oval, err;
1387
1388         err = get_cur_ctl_value(cval, cval->control << 8, &oval);
1389         if (err < 0) {
1390                 if (cval->mixer->ignore_ctl_error)
1391                         return 0;
1392                 return err;
1393         }
1394         val = ucontrol->value.integer.value[0];
1395         val = get_abs_value(cval, val);
1396         if (val != oval) {
1397                 set_cur_ctl_value(cval, cval->control << 8, val);
1398                 return 1;
1399         }
1400         return 0;
1401 }
1402
1403 /* alsa control interface for processing/extension unit */
1404 static struct snd_kcontrol_new mixer_procunit_ctl = {
1405         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1406         .name = "", /* will be filled later */
1407         .info = mixer_ctl_feature_info,
1408         .get = mixer_ctl_procunit_get,
1409         .put = mixer_ctl_procunit_put,
1410 };
1411
1412
1413 /*
1414  * predefined data for processing units
1415  */
1416 struct procunit_value_info {
1417         int control;
1418         char *suffix;
1419         int val_type;
1420         int min_value;
1421 };
1422
1423 struct procunit_info {
1424         int type;
1425         char *name;
1426         struct procunit_value_info *values;
1427 };
1428
1429 static struct procunit_value_info updown_proc_info[] = {
1430         { UAC_UD_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1431         { UAC_UD_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
1432         { 0 }
1433 };
1434 static struct procunit_value_info prologic_proc_info[] = {
1435         { UAC_DP_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1436         { UAC_DP_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
1437         { 0 }
1438 };
1439 static struct procunit_value_info threed_enh_proc_info[] = {
1440         { UAC_3D_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1441         { UAC_3D_SPACE, "Spaciousness", USB_MIXER_U8 },
1442         { 0 }
1443 };
1444 static struct procunit_value_info reverb_proc_info[] = {
1445         { UAC_REVERB_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1446         { UAC_REVERB_LEVEL, "Level", USB_MIXER_U8 },
1447         { UAC_REVERB_TIME, "Time", USB_MIXER_U16 },
1448         { UAC_REVERB_FEEDBACK, "Feedback", USB_MIXER_U8 },
1449         { 0 }
1450 };
1451 static struct procunit_value_info chorus_proc_info[] = {
1452         { UAC_CHORUS_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1453         { UAC_CHORUS_LEVEL, "Level", USB_MIXER_U8 },
1454         { UAC_CHORUS_RATE, "Rate", USB_MIXER_U16 },
1455         { UAC_CHORUS_DEPTH, "Depth", USB_MIXER_U16 },
1456         { 0 }
1457 };
1458 static struct procunit_value_info dcr_proc_info[] = {
1459         { UAC_DCR_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1460         { UAC_DCR_RATE, "Ratio", USB_MIXER_U16 },
1461         { UAC_DCR_MAXAMPL, "Max Amp", USB_MIXER_S16 },
1462         { UAC_DCR_THRESHOLD, "Threshold", USB_MIXER_S16 },
1463         { UAC_DCR_ATTACK_TIME, "Attack Time", USB_MIXER_U16 },
1464         { UAC_DCR_RELEASE_TIME, "Release Time", USB_MIXER_U16 },
1465         { 0 }
1466 };
1467
1468 static struct procunit_info procunits[] = {
1469         { UAC_PROCESS_UP_DOWNMIX, "Up Down", updown_proc_info },
1470         { UAC_PROCESS_DOLBY_PROLOGIC, "Dolby Prologic", prologic_proc_info },
1471         { UAC_PROCESS_STEREO_EXTENDER, "3D Stereo Extender", threed_enh_proc_info },
1472         { UAC_PROCESS_REVERB, "Reverb", reverb_proc_info },
1473         { UAC_PROCESS_CHORUS, "Chorus", chorus_proc_info },
1474         { UAC_PROCESS_DYN_RANGE_COMP, "DCR", dcr_proc_info },
1475         { 0 },
1476 };
1477 /*
1478  * predefined data for extension units
1479  */
1480 static struct procunit_value_info clock_rate_xu_info[] = {
1481         { USB_XU_CLOCK_RATE_SELECTOR, "Selector", USB_MIXER_U8, 0 },
1482         { 0 }
1483 };
1484 static struct procunit_value_info clock_source_xu_info[] = {
1485         { USB_XU_CLOCK_SOURCE_SELECTOR, "External", USB_MIXER_BOOLEAN },
1486         { 0 }
1487 };
1488 static struct procunit_value_info spdif_format_xu_info[] = {
1489         { USB_XU_DIGITAL_FORMAT_SELECTOR, "SPDIF/AC3", USB_MIXER_BOOLEAN },
1490         { 0 }
1491 };
1492 static struct procunit_value_info soft_limit_xu_info[] = {
1493         { USB_XU_SOFT_LIMIT_SELECTOR, " ", USB_MIXER_BOOLEAN },
1494         { 0 }
1495 };
1496 static struct procunit_info extunits[] = {
1497         { USB_XU_CLOCK_RATE, "Clock rate", clock_rate_xu_info },
1498         { USB_XU_CLOCK_SOURCE, "DigitalIn CLK source", clock_source_xu_info },
1499         { USB_XU_DIGITAL_IO_STATUS, "DigitalOut format:", spdif_format_xu_info },
1500         { USB_XU_DEVICE_OPTIONS, "AnalogueIn Soft Limit", soft_limit_xu_info },
1501         { 0 }
1502 };
1503 /*
1504  * build a processing/extension unit
1505  */
1506 static int build_audio_procunit(struct mixer_build *state, int unitid, void *raw_desc, struct procunit_info *list, char *name)
1507 {
1508         struct uac_processing_unit_descriptor *desc = raw_desc;
1509         int num_ins = desc->bNrInPins;
1510         struct usb_mixer_elem_info *cval;
1511         struct snd_kcontrol *kctl;
1512         int i, err, nameid, type, len;
1513         struct procunit_info *info;
1514         struct procunit_value_info *valinfo;
1515         const struct usbmix_name_map *map;
1516         static struct procunit_value_info default_value_info[] = {
1517                 { 0x01, "Switch", USB_MIXER_BOOLEAN },
1518                 { 0 }
1519         };
1520         static struct procunit_info default_info = {
1521                 0, NULL, default_value_info
1522         };
1523
1524         if (desc->bLength < 13 || desc->bLength < 13 + num_ins ||
1525             desc->bLength < num_ins + uac_processing_unit_bControlSize(desc, state->mixer->protocol)) {
1526                 snd_printk(KERN_ERR "invalid %s descriptor (id %d)\n", name, unitid);
1527                 return -EINVAL;
1528         }
1529
1530         for (i = 0; i < num_ins; i++) {
1531                 if ((err = parse_audio_unit(state, desc->baSourceID[i])) < 0)
1532                         return err;
1533         }
1534
1535         type = le16_to_cpu(desc->wProcessType);
1536         for (info = list; info && info->type; info++)
1537                 if (info->type == type)
1538                         break;
1539         if (! info || ! info->type)
1540                 info = &default_info;
1541
1542         for (valinfo = info->values; valinfo->control; valinfo++) {
1543                 __u8 *controls = uac_processing_unit_bmControls(desc, state->mixer->protocol);
1544
1545                 if (! (controls[valinfo->control / 8] & (1 << ((valinfo->control % 8) - 1))))
1546                         continue;
1547                 map = find_map(state, unitid, valinfo->control);
1548                 if (check_ignored_ctl(map))
1549                         continue;
1550                 cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1551                 if (! cval) {
1552                         snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1553                         return -ENOMEM;
1554                 }
1555                 cval->mixer = state->mixer;
1556                 cval->id = unitid;
1557                 cval->control = valinfo->control;
1558                 cval->val_type = valinfo->val_type;
1559                 cval->channels = 1;
1560
1561                 /* get min/max values */
1562                 if (type == UAC_PROCESS_UP_DOWNMIX && cval->control == UAC_UD_MODE_SELECT) {
1563                         __u8 *control_spec = uac_processing_unit_specific(desc, state->mixer->protocol);
1564                         /* FIXME: hard-coded */
1565                         cval->min = 1;
1566                         cval->max = control_spec[0];
1567                         cval->res = 1;
1568                         cval->initialized = 1;
1569                 } else {
1570                         if (type == USB_XU_CLOCK_RATE) {
1571                                 /* E-Mu USB 0404/0202/TrackerPre
1572                                  * samplerate control quirk
1573                                  */
1574                                 cval->min = 0;
1575                                 cval->max = 5;
1576                                 cval->res = 1;
1577                                 cval->initialized = 1;
1578                         } else
1579                                 get_min_max(cval, valinfo->min_value);
1580                 }
1581
1582                 kctl = snd_ctl_new1(&mixer_procunit_ctl, cval);
1583                 if (! kctl) {
1584                         snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1585                         kfree(cval);
1586                         return -ENOMEM;
1587                 }
1588                 kctl->private_free = usb_mixer_elem_free;
1589
1590                 if (check_mapped_name(map, kctl->id.name,
1591                                                 sizeof(kctl->id.name)))
1592                         /* nothing */ ;
1593                 else if (info->name)
1594                         strlcpy(kctl->id.name, info->name, sizeof(kctl->id.name));
1595                 else {
1596                         nameid = uac_processing_unit_iProcessing(desc, state->mixer->protocol);
1597                         len = 0;
1598                         if (nameid)
1599                                 len = snd_usb_copy_string_desc(state, nameid, kctl->id.name, sizeof(kctl->id.name));
1600                         if (! len)
1601                                 strlcpy(kctl->id.name, name, sizeof(kctl->id.name));
1602                 }
1603                 append_ctl_name(kctl, " ");
1604                 append_ctl_name(kctl, valinfo->suffix);
1605
1606                 snd_printdd(KERN_INFO "[%d] PU [%s] ch = %d, val = %d/%d\n",
1607                             cval->id, kctl->id.name, cval->channels, cval->min, cval->max);
1608                 if ((err = add_control_to_empty(state, kctl)) < 0)
1609                         return err;
1610         }
1611         return 0;
1612 }
1613
1614
1615 static int parse_audio_processing_unit(struct mixer_build *state, int unitid, void *raw_desc)
1616 {
1617         return build_audio_procunit(state, unitid, raw_desc, procunits, "Processing Unit");
1618 }
1619
1620 static int parse_audio_extension_unit(struct mixer_build *state, int unitid, void *raw_desc)
1621 {
1622         /* Note that we parse extension units with processing unit descriptors.
1623          * That's ok as the layout is the same */
1624         return build_audio_procunit(state, unitid, raw_desc, extunits, "Extension Unit");
1625 }
1626
1627
1628 /*
1629  * Selector Unit
1630  */
1631
1632 /* info callback for selector unit
1633  * use an enumerator type for routing
1634  */
1635 static int mixer_ctl_selector_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
1636 {
1637         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1638         char **itemlist = (char **)kcontrol->private_value;
1639
1640         if (snd_BUG_ON(!itemlist))
1641                 return -EINVAL;
1642         uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
1643         uinfo->count = 1;
1644         uinfo->value.enumerated.items = cval->max;
1645         if ((int)uinfo->value.enumerated.item >= cval->max)
1646                 uinfo->value.enumerated.item = cval->max - 1;
1647         strcpy(uinfo->value.enumerated.name, itemlist[uinfo->value.enumerated.item]);
1648         return 0;
1649 }
1650
1651 /* get callback for selector unit */
1652 static int mixer_ctl_selector_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1653 {
1654         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1655         int val, err;
1656
1657         err = get_cur_ctl_value(cval, cval->control << 8, &val);
1658         if (err < 0) {
1659                 if (cval->mixer->ignore_ctl_error) {
1660                         ucontrol->value.enumerated.item[0] = 0;
1661                         return 0;
1662                 }
1663                 return err;
1664         }
1665         val = get_relative_value(cval, val);
1666         ucontrol->value.enumerated.item[0] = val;
1667         return 0;
1668 }
1669
1670 /* put callback for selector unit */
1671 static int mixer_ctl_selector_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1672 {
1673         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1674         int val, oval, err;
1675
1676         err = get_cur_ctl_value(cval, cval->control << 8, &oval);
1677         if (err < 0) {
1678                 if (cval->mixer->ignore_ctl_error)
1679                         return 0;
1680                 return err;
1681         }
1682         val = ucontrol->value.enumerated.item[0];
1683         val = get_abs_value(cval, val);
1684         if (val != oval) {
1685                 set_cur_ctl_value(cval, cval->control << 8, val);
1686                 return 1;
1687         }
1688         return 0;
1689 }
1690
1691 /* alsa control interface for selector unit */
1692 static struct snd_kcontrol_new mixer_selectunit_ctl = {
1693         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1694         .name = "", /* will be filled later */
1695         .info = mixer_ctl_selector_info,
1696         .get = mixer_ctl_selector_get,
1697         .put = mixer_ctl_selector_put,
1698 };
1699
1700
1701 /* private free callback.
1702  * free both private_data and private_value
1703  */
1704 static void usb_mixer_selector_elem_free(struct snd_kcontrol *kctl)
1705 {
1706         int i, num_ins = 0;
1707
1708         if (kctl->private_data) {
1709                 struct usb_mixer_elem_info *cval = kctl->private_data;
1710                 num_ins = cval->max;
1711                 kfree(cval);
1712                 kctl->private_data = NULL;
1713         }
1714         if (kctl->private_value) {
1715                 char **itemlist = (char **)kctl->private_value;
1716                 for (i = 0; i < num_ins; i++)
1717                         kfree(itemlist[i]);
1718                 kfree(itemlist);
1719                 kctl->private_value = 0;
1720         }
1721 }
1722
1723 /*
1724  * parse a selector unit
1725  */
1726 static int parse_audio_selector_unit(struct mixer_build *state, int unitid, void *raw_desc)
1727 {
1728         struct uac_selector_unit_descriptor *desc = raw_desc;
1729         unsigned int i, nameid, len;
1730         int err;
1731         struct usb_mixer_elem_info *cval;
1732         struct snd_kcontrol *kctl;
1733         const struct usbmix_name_map *map;
1734         char **namelist;
1735
1736         if (!desc->bNrInPins || desc->bLength < 5 + desc->bNrInPins) {
1737                 snd_printk(KERN_ERR "invalid SELECTOR UNIT descriptor %d\n", unitid);
1738                 return -EINVAL;
1739         }
1740
1741         for (i = 0; i < desc->bNrInPins; i++) {
1742                 if ((err = parse_audio_unit(state, desc->baSourceID[i])) < 0)
1743                         return err;
1744         }
1745
1746         if (desc->bNrInPins == 1) /* only one ? nonsense! */
1747                 return 0;
1748
1749         map = find_map(state, unitid, 0);
1750         if (check_ignored_ctl(map))
1751                 return 0;
1752
1753         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1754         if (! cval) {
1755                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1756                 return -ENOMEM;
1757         }
1758         cval->mixer = state->mixer;
1759         cval->id = unitid;
1760         cval->val_type = USB_MIXER_U8;
1761         cval->channels = 1;
1762         cval->min = 1;
1763         cval->max = desc->bNrInPins;
1764         cval->res = 1;
1765         cval->initialized = 1;
1766
1767         if (desc->bDescriptorSubtype == UAC2_CLOCK_SELECTOR)
1768                 cval->control = UAC2_CX_CLOCK_SELECTOR;
1769         else
1770                 cval->control = 0;
1771
1772         namelist = kmalloc(sizeof(char *) * desc->bNrInPins, GFP_KERNEL);
1773         if (! namelist) {
1774                 snd_printk(KERN_ERR "cannot malloc\n");
1775                 kfree(cval);
1776                 return -ENOMEM;
1777         }
1778 #define MAX_ITEM_NAME_LEN       64
1779         for (i = 0; i < desc->bNrInPins; i++) {
1780                 struct usb_audio_term iterm;
1781                 len = 0;
1782                 namelist[i] = kmalloc(MAX_ITEM_NAME_LEN, GFP_KERNEL);
1783                 if (! namelist[i]) {
1784                         snd_printk(KERN_ERR "cannot malloc\n");
1785                         while (i--)
1786                                 kfree(namelist[i]);
1787                         kfree(namelist);
1788                         kfree(cval);
1789                         return -ENOMEM;
1790                 }
1791                 len = check_mapped_selector_name(state, unitid, i, namelist[i],
1792                                                  MAX_ITEM_NAME_LEN);
1793                 if (! len && check_input_term(state, desc->baSourceID[i], &iterm) >= 0)
1794                         len = get_term_name(state, &iterm, namelist[i], MAX_ITEM_NAME_LEN, 0);
1795                 if (! len)
1796                         sprintf(namelist[i], "Input %d", i);
1797         }
1798
1799         kctl = snd_ctl_new1(&mixer_selectunit_ctl, cval);
1800         if (! kctl) {
1801                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1802                 kfree(namelist);
1803                 kfree(cval);
1804                 return -ENOMEM;
1805         }
1806         kctl->private_value = (unsigned long)namelist;
1807         kctl->private_free = usb_mixer_selector_elem_free;
1808
1809         nameid = uac_selector_unit_iSelector(desc);
1810         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
1811         if (len)
1812                 ;
1813         else if (nameid)
1814                 snd_usb_copy_string_desc(state, nameid, kctl->id.name, sizeof(kctl->id.name));
1815         else {
1816                 len = get_term_name(state, &state->oterm,
1817                                     kctl->id.name, sizeof(kctl->id.name), 0);
1818                 if (! len)
1819                         strlcpy(kctl->id.name, "USB", sizeof(kctl->id.name));
1820
1821                 if (desc->bDescriptorSubtype == UAC2_CLOCK_SELECTOR)
1822                         append_ctl_name(kctl, " Clock Source");
1823                 else if ((state->oterm.type & 0xff00) == 0x0100)
1824                         append_ctl_name(kctl, " Capture Source");
1825                 else
1826                         append_ctl_name(kctl, " Playback Source");
1827         }
1828
1829         snd_printdd(KERN_INFO "[%d] SU [%s] items = %d\n",
1830                     cval->id, kctl->id.name, desc->bNrInPins);
1831         if ((err = add_control_to_empty(state, kctl)) < 0)
1832                 return err;
1833
1834         return 0;
1835 }
1836
1837
1838 /*
1839  * parse an audio unit recursively
1840  */
1841
1842 static int parse_audio_unit(struct mixer_build *state, int unitid)
1843 {
1844         unsigned char *p1;
1845
1846         if (test_and_set_bit(unitid, state->unitbitmap))
1847                 return 0; /* the unit already visited */
1848
1849         p1 = find_audio_control_unit(state, unitid);
1850         if (!p1) {
1851                 snd_printk(KERN_ERR "usbaudio: unit %d not found!\n", unitid);
1852                 return -EINVAL;
1853         }
1854
1855         switch (p1[2]) {
1856         case UAC_INPUT_TERMINAL:
1857         case UAC2_CLOCK_SOURCE:
1858                 return 0; /* NOP */
1859         case UAC_MIXER_UNIT:
1860                 return parse_audio_mixer_unit(state, unitid, p1);
1861         case UAC_SELECTOR_UNIT:
1862         case UAC2_CLOCK_SELECTOR:
1863                 return parse_audio_selector_unit(state, unitid, p1);
1864         case UAC_FEATURE_UNIT:
1865                 return parse_audio_feature_unit(state, unitid, p1);
1866         case UAC1_PROCESSING_UNIT:
1867         /*   UAC2_EFFECT_UNIT has the same value */
1868                 if (state->mixer->protocol == UAC_VERSION_1)
1869                         return parse_audio_processing_unit(state, unitid, p1);
1870                 else
1871                         return 0; /* FIXME - effect units not implemented yet */
1872         case UAC1_EXTENSION_UNIT:
1873         /*   UAC2_PROCESSING_UNIT_V2 has the same value */
1874                 if (state->mixer->protocol == UAC_VERSION_1)
1875                         return parse_audio_extension_unit(state, unitid, p1);
1876                 else /* UAC_VERSION_2 */
1877                         return parse_audio_processing_unit(state, unitid, p1);
1878         default:
1879                 snd_printk(KERN_ERR "usbaudio: unit %u: unexpected type 0x%02x\n", unitid, p1[2]);
1880                 return -EINVAL;
1881         }
1882 }
1883
1884 static void snd_usb_mixer_free(struct usb_mixer_interface *mixer)
1885 {
1886         kfree(mixer->id_elems);
1887         if (mixer->urb) {
1888                 kfree(mixer->urb->transfer_buffer);
1889                 usb_free_urb(mixer->urb);
1890         }
1891         usb_free_urb(mixer->rc_urb);
1892         kfree(mixer->rc_setup_packet);
1893         kfree(mixer);
1894 }
1895
1896 static int snd_usb_mixer_dev_free(struct snd_device *device)
1897 {
1898         struct usb_mixer_interface *mixer = device->device_data;
1899         snd_usb_mixer_free(mixer);
1900         return 0;
1901 }
1902
1903 /*
1904  * create mixer controls
1905  *
1906  * walk through all UAC_OUTPUT_TERMINAL descriptors to search for mixers
1907  */
1908 static int snd_usb_mixer_controls(struct usb_mixer_interface *mixer)
1909 {
1910         struct mixer_build state;
1911         int err;
1912         const struct usbmix_ctl_map *map;
1913         struct usb_host_interface *hostif;
1914         void *p;
1915
1916         hostif = mixer->chip->ctrl_intf;
1917         memset(&state, 0, sizeof(state));
1918         state.chip = mixer->chip;
1919         state.mixer = mixer;
1920         state.buffer = hostif->extra;
1921         state.buflen = hostif->extralen;
1922
1923         /* check the mapping table */
1924         for (map = usbmix_ctl_maps; map->id; map++) {
1925                 if (map->id == state.chip->usb_id) {
1926                         state.map = map->map;
1927                         state.selector_map = map->selector_map;
1928                         mixer->ignore_ctl_error = map->ignore_ctl_error;
1929                         break;
1930                 }
1931         }
1932
1933         p = NULL;
1934         while ((p = snd_usb_find_csint_desc(hostif->extra, hostif->extralen, p, UAC_OUTPUT_TERMINAL)) != NULL) {
1935                 if (mixer->protocol == UAC_VERSION_1) {
1936                         struct uac1_output_terminal_descriptor *desc = p;
1937
1938                         if (desc->bLength < sizeof(*desc))
1939                                 continue; /* invalid descriptor? */
1940                         set_bit(desc->bTerminalID, state.unitbitmap);  /* mark terminal ID as visited */
1941                         state.oterm.id = desc->bTerminalID;
1942                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
1943                         state.oterm.name = desc->iTerminal;
1944                         err = parse_audio_unit(&state, desc->bSourceID);
1945                         if (err < 0)
1946                                 return err;
1947                 } else { /* UAC_VERSION_2 */
1948                         struct uac2_output_terminal_descriptor *desc = p;
1949
1950                         if (desc->bLength < sizeof(*desc))
1951                                 continue; /* invalid descriptor? */
1952                         set_bit(desc->bTerminalID, state.unitbitmap);  /* mark terminal ID as visited */
1953                         state.oterm.id = desc->bTerminalID;
1954                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
1955                         state.oterm.name = desc->iTerminal;
1956                         err = parse_audio_unit(&state, desc->bSourceID);
1957                         if (err < 0)
1958                                 return err;
1959
1960                         /* for UAC2, use the same approach to also add the clock selectors */
1961                         err = parse_audio_unit(&state, desc->bCSourceID);
1962                         if (err < 0)
1963                                 return err;
1964                 }
1965         }
1966
1967         return 0;
1968 }
1969
1970 void snd_usb_mixer_notify_id(struct usb_mixer_interface *mixer, int unitid)
1971 {
1972         struct usb_mixer_elem_info *info;
1973
1974         for (info = mixer->id_elems[unitid]; info; info = info->next_id_elem)
1975                 snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
1976                                info->elem_id);
1977 }
1978
1979 static void snd_usb_mixer_dump_cval(struct snd_info_buffer *buffer,
1980                                     int unitid,
1981                                     struct usb_mixer_elem_info *cval)
1982 {
1983         static char *val_types[] = {"BOOLEAN", "INV_BOOLEAN",
1984                                     "S8", "U8", "S16", "U16"};
1985         snd_iprintf(buffer, "  Unit: %i\n", unitid);
1986         if (cval->elem_id)
1987                 snd_iprintf(buffer, "    Control: name=\"%s\", index=%i\n",
1988                                 cval->elem_id->name, cval->elem_id->index);
1989         snd_iprintf(buffer, "    Info: id=%i, control=%i, cmask=0x%x, "
1990                             "channels=%i, type=\"%s\"\n", cval->id,
1991                             cval->control, cval->cmask, cval->channels,
1992                             val_types[cval->val_type]);
1993         snd_iprintf(buffer, "    Volume: min=%i, max=%i, dBmin=%i, dBmax=%i\n",
1994                             cval->min, cval->max, cval->dBmin, cval->dBmax);
1995 }
1996
1997 static void snd_usb_mixer_proc_read(struct snd_info_entry *entry,
1998                                     struct snd_info_buffer *buffer)
1999 {
2000         struct snd_usb_audio *chip = entry->private_data;
2001         struct usb_mixer_interface *mixer;
2002         struct usb_mixer_elem_info *cval;
2003         int unitid;
2004
2005         list_for_each_entry(mixer, &chip->mixer_list, list) {
2006                 snd_iprintf(buffer,
2007                         "USB Mixer: usb_id=0x%08x, ctrlif=%i, ctlerr=%i\n",
2008                                 chip->usb_id, snd_usb_ctrl_intf(chip),
2009                                 mixer->ignore_ctl_error);
2010                 snd_iprintf(buffer, "Card: %s\n", chip->card->longname);
2011                 for (unitid = 0; unitid < MAX_ID_ELEMS; unitid++) {
2012                         for (cval = mixer->id_elems[unitid]; cval;
2013                                                 cval = cval->next_id_elem)
2014                                 snd_usb_mixer_dump_cval(buffer, unitid, cval);
2015                 }
2016         }
2017 }
2018
2019 static void snd_usb_mixer_interrupt_v2(struct usb_mixer_interface *mixer,
2020                                        int attribute, int value, int index)
2021 {
2022         struct usb_mixer_elem_info *info;
2023         __u8 unitid = (index >> 8) & 0xff;
2024         __u8 control = (value >> 8) & 0xff;
2025         __u8 channel = value & 0xff;
2026
2027         if (channel >= MAX_CHANNELS) {
2028                 snd_printk(KERN_DEBUG "%s(): bogus channel number %d\n",
2029                                 __func__, channel);
2030                 return;
2031         }
2032
2033         for (info = mixer->id_elems[unitid]; info; info = info->next_id_elem) {
2034                 if (info->control != control)
2035                         continue;
2036
2037                 switch (attribute) {
2038                 case UAC2_CS_CUR:
2039                         /* invalidate cache, so the value is read from the device */
2040                         if (channel)
2041                                 info->cached &= ~(1 << channel);
2042                         else /* master channel */
2043                                 info->cached = 0;
2044
2045                         snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
2046                                         info->elem_id);
2047                         break;
2048
2049                 case UAC2_CS_RANGE:
2050                         /* TODO */
2051                         break;
2052
2053                 case UAC2_CS_MEM:
2054                         /* TODO */
2055                         break;
2056
2057                 default:
2058                         snd_printk(KERN_DEBUG "unknown attribute %d in interrupt\n",
2059                                                 attribute);
2060                         break;
2061                 } /* switch */
2062         }
2063 }
2064
2065 static void snd_usb_mixer_interrupt(struct urb *urb)
2066 {
2067         struct usb_mixer_interface *mixer = urb->context;
2068         int len = urb->actual_length;
2069
2070         if (urb->status != 0)
2071                 goto requeue;
2072
2073         if (mixer->protocol == UAC_VERSION_1) {
2074                 struct uac1_status_word *status;
2075
2076                 for (status = urb->transfer_buffer;
2077                      len >= sizeof(*status);
2078                      len -= sizeof(*status), status++) {
2079                         snd_printd(KERN_DEBUG "status interrupt: %02x %02x\n",
2080                                                 status->bStatusType,
2081                                                 status->bOriginator);
2082
2083                         /* ignore any notifications not from the control interface */
2084                         if ((status->bStatusType & UAC1_STATUS_TYPE_ORIG_MASK) !=
2085                                 UAC1_STATUS_TYPE_ORIG_AUDIO_CONTROL_IF)
2086                                 continue;
2087
2088                         if (status->bStatusType & UAC1_STATUS_TYPE_MEM_CHANGED)
2089                                 snd_usb_mixer_rc_memory_change(mixer, status->bOriginator);
2090                         else
2091                                 snd_usb_mixer_notify_id(mixer, status->bOriginator);
2092                 }
2093         } else { /* UAC_VERSION_2 */
2094                 struct uac2_interrupt_data_msg *msg;
2095
2096                 for (msg = urb->transfer_buffer;
2097                      len >= sizeof(*msg);
2098                      len -= sizeof(*msg), msg++) {
2099                         /* drop vendor specific and endpoint requests */
2100                         if ((msg->bInfo & UAC2_INTERRUPT_DATA_MSG_VENDOR) ||
2101                             (msg->bInfo & UAC2_INTERRUPT_DATA_MSG_EP))
2102                                 continue;
2103
2104                         snd_usb_mixer_interrupt_v2(mixer, msg->bAttribute,
2105                                                    le16_to_cpu(msg->wValue),
2106                                                    le16_to_cpu(msg->wIndex));
2107                 }
2108         }
2109
2110 requeue:
2111         if (urb->status != -ENOENT && urb->status != -ECONNRESET) {
2112                 urb->dev = mixer->chip->dev;
2113                 usb_submit_urb(urb, GFP_ATOMIC);
2114         }
2115 }
2116
2117 /* create the handler for the optional status interrupt endpoint */
2118 static int snd_usb_mixer_status_create(struct usb_mixer_interface *mixer)
2119 {
2120         struct usb_host_interface *hostif;
2121         struct usb_endpoint_descriptor *ep;
2122         void *transfer_buffer;
2123         int buffer_length;
2124         unsigned int epnum;
2125
2126         hostif = mixer->chip->ctrl_intf;
2127         /* we need one interrupt input endpoint */
2128         if (get_iface_desc(hostif)->bNumEndpoints < 1)
2129                 return 0;
2130         ep = get_endpoint(hostif, 0);
2131         if (!usb_endpoint_dir_in(ep) || !usb_endpoint_xfer_int(ep))
2132                 return 0;
2133
2134         epnum = usb_endpoint_num(ep);
2135         buffer_length = le16_to_cpu(ep->wMaxPacketSize);
2136         transfer_buffer = kmalloc(buffer_length, GFP_KERNEL);
2137         if (!transfer_buffer)
2138                 return -ENOMEM;
2139         mixer->urb = usb_alloc_urb(0, GFP_KERNEL);
2140         if (!mixer->urb) {
2141                 kfree(transfer_buffer);
2142                 return -ENOMEM;
2143         }
2144         usb_fill_int_urb(mixer->urb, mixer->chip->dev,
2145                          usb_rcvintpipe(mixer->chip->dev, epnum),
2146                          transfer_buffer, buffer_length,
2147                          snd_usb_mixer_interrupt, mixer, ep->bInterval);
2148         usb_submit_urb(mixer->urb, GFP_KERNEL);
2149         return 0;
2150 }
2151
2152 int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif,
2153                          int ignore_error)
2154 {
2155         static struct snd_device_ops dev_ops = {
2156                 .dev_free = snd_usb_mixer_dev_free
2157         };
2158         struct usb_mixer_interface *mixer;
2159         struct snd_info_entry *entry;
2160         struct usb_host_interface *host_iface;
2161         int err;
2162
2163         strcpy(chip->card->mixername, "USB Mixer");
2164
2165         mixer = kzalloc(sizeof(*mixer), GFP_KERNEL);
2166         if (!mixer)
2167                 return -ENOMEM;
2168         mixer->chip = chip;
2169         mixer->ignore_ctl_error = ignore_error;
2170         mixer->id_elems = kcalloc(MAX_ID_ELEMS, sizeof(*mixer->id_elems),
2171                                   GFP_KERNEL);
2172         if (!mixer->id_elems) {
2173                 kfree(mixer);
2174                 return -ENOMEM;
2175         }
2176
2177         host_iface = &usb_ifnum_to_if(chip->dev, ctrlif)->altsetting[0];
2178         switch (get_iface_desc(host_iface)->bInterfaceProtocol) {
2179         case UAC_VERSION_1:
2180         default:
2181                 mixer->protocol = UAC_VERSION_1;
2182                 break;
2183         case UAC_VERSION_2:
2184                 mixer->protocol = UAC_VERSION_2;
2185                 break;
2186         }
2187
2188         if ((err = snd_usb_mixer_controls(mixer)) < 0 ||
2189             (err = snd_usb_mixer_status_create(mixer)) < 0)
2190                 goto _error;
2191
2192         snd_usb_mixer_apply_create_quirk(mixer);
2193
2194         err = snd_device_new(chip->card, SNDRV_DEV_LOWLEVEL, mixer, &dev_ops);
2195         if (err < 0)
2196                 goto _error;
2197
2198         if (list_empty(&chip->mixer_list) &&
2199             !snd_card_proc_new(chip->card, "usbmixer", &entry))
2200                 snd_info_set_text_ops(entry, chip, snd_usb_mixer_proc_read);
2201
2202         list_add(&mixer->list, &chip->mixer_list);
2203         return 0;
2204
2205 _error:
2206         snd_usb_mixer_free(mixer);
2207         return err;
2208 }
2209
2210 void snd_usb_mixer_disconnect(struct list_head *p)
2211 {
2212         struct usb_mixer_interface *mixer;
2213
2214         mixer = list_entry(p, struct usb_mixer_interface, list);
2215         usb_kill_urb(mixer->urb);
2216         usb_kill_urb(mixer->rc_urb);
2217 }