SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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 #include <linux/bitops.h>
  30 #include <linux/init.h>
  31 #include <linux/list.h>
  32 #include <linux/slab.h>
  33 #include <linux/string.h>
  34 #include <linux/usb.h>
  35 #include <linux/usb/audio.h>
  36
  37 #include <sound/core.h>
  38 #include <sound/control.h>
  39 #include <sound/hwdep.h>
  40 #include <sound/info.h>
  41 #include <sound/tlv.h>
  42
  43 #include "usbaudio.h"
  44 #include "mixer.h"
  45 #include "helper.h"
  46 #include "mixer_quirks.h"
  47
  48 #define MAX_ID_ELEMS    256
  49
  50 struct usb_audio_term {
  51         int id;
  52         int type;
  53         int channels;
  54         unsigned int chconfig;
  55         int name;
  56 };
  57
  58 struct usbmix_name_map;
  59
  60 struct mixer_build {
  61         struct snd_usb_audio *chip;
  62         struct usb_mixer_interface *mixer;
  63         unsigned char *buffer;
  64         unsigned int buflen;
  65         DECLARE_BITMAP(unitbitmap, MAX_ID_ELEMS);
  66         struct usb_audio_term oterm;
  67         const struct usbmix_name_map *map;
  68         const struct usbmix_selector_map *selector_map;
  69 };
  70
  71 enum {
  72         USB_MIXER_BOOLEAN,
  73         USB_MIXER_INV_BOOLEAN,
  74         USB_MIXER_S8,
  75         USB_MIXER_U8,
  76         USB_MIXER_S16,
  77         USB_MIXER_U16,
  78 };
  79
  80 enum {
  81         USB_PROC_UPDOWN = 1,
  82         USB_PROC_UPDOWN_SWITCH = 1,
  83         USB_PROC_UPDOWN_MODE_SEL = 2,
  84
  85         USB_PROC_PROLOGIC = 2,
  86         USB_PROC_PROLOGIC_SWITCH = 1,
  87         USB_PROC_PROLOGIC_MODE_SEL = 2,
  88
  89         USB_PROC_3DENH = 3,
  90         USB_PROC_3DENH_SWITCH = 1,
  91         USB_PROC_3DENH_SPACE = 2,
  92
  93         USB_PROC_REVERB = 4,
  94         USB_PROC_REVERB_SWITCH = 1,
  95         USB_PROC_REVERB_LEVEL = 2,
  96         USB_PROC_REVERB_TIME = 3,
  97         USB_PROC_REVERB_DELAY = 4,
  98
  99         USB_PROC_CHORUS = 5,
 100         USB_PROC_CHORUS_SWITCH = 1,
 101         USB_PROC_CHORUS_LEVEL = 2,
 102         USB_PROC_CHORUS_RATE = 3,
 103         USB_PROC_CHORUS_DEPTH = 4,
 104
 105         USB_PROC_DCR = 6,
 106         USB_PROC_DCR_SWITCH = 1,
 107         USB_PROC_DCR_RATIO = 2,
 108         USB_PROC_DCR_MAX_AMP = 3,
 109         USB_PROC_DCR_THRESHOLD = 4,
 110         USB_PROC_DCR_ATTACK = 5,
 111         USB_PROC_DCR_RELEASE = 6,
 112 };
 113
 114 /*E-mu 0202(0404) eXtension Unit(XU) control*/
 115 enum {
 116         USB_XU_CLOCK_RATE               = 0xe301,
 117         USB_XU_CLOCK_SOURCE             = 0xe302,
 118         USB_XU_DIGITAL_IO_STATUS        = 0xe303,
 119         USB_XU_DEVICE_OPTIONS           = 0xe304,
 120         USB_XU_DIRECT_MONITORING        = 0xe305,
 121         USB_XU_METERING                 = 0xe306
 122 };
 123 enum {
 124         USB_XU_CLOCK_SOURCE_SELECTOR = 0x02,    /* clock source*/
 125         USB_XU_CLOCK_RATE_SELECTOR = 0x03,      /* clock rate */
 126         USB_XU_DIGITAL_FORMAT_SELECTOR = 0x01,  /* the spdif format */
 127         USB_XU_SOFT_LIMIT_SELECTOR = 0x03       /* soft limiter */
 128 };
 129
 130 /*
 131  * manual mapping of mixer names
 132  * if the mixer topology is too complicated and the parsed names are
 133  * ambiguous, add the entries in usbmixer_maps.c.
 134  */
 135 #include "mixer_maps.c"
 136
 137 static const struct usbmix_name_map *
 138 find_map(struct mixer_build *state, int unitid, int control)
 139 {
 140         const struct usbmix_name_map *p = state->map;
 141
 142         if (!p)
 143                 return NULL;
 144
 145         for (p = state->map; p->id; p++) {
 146                 if (p->id == unitid &&
 147                     (!control || !p->control || control == p->control))
 148                         return p;
 149         }
 150         return NULL;
 151 }
 152
 153 /* get the mapped name if the unit matches */
 154 static int
 155 check_mapped_name(const struct usbmix_name_map *p, char *buf, int buflen)
 156 {
 157         if (!p || !p->name)
 158                 return 0;
 159
 160         buflen--;
 161         return strlcpy(buf, p->name, buflen);
 162 }
 163
 164 /* check whether the control should be ignored */
 165 static inline int
 166 check_ignored_ctl(const struct usbmix_name_map *p)
 167 {
 168         if (!p || p->name || p->dB)
 169                 return 0;
 170         return 1;
 171 }
 172
 173 /* dB mapping */
 174 static inline void check_mapped_dB(const struct usbmix_name_map *p,
 175                                    struct usb_mixer_elem_info *cval)
 176 {
 177         if (p && p->dB) {
 178                 cval->dBmin = p->dB->min;
 179                 cval->dBmax = p->dB->max;
 180         }
 181 }
 182
 183 /* get the mapped selector source name */
 184 static int check_mapped_selector_name(struct mixer_build *state, int unitid,
 185                                       int index, char *buf, int buflen)
 186 {
 187         const struct usbmix_selector_map *p;
 188
 189         if (! state->selector_map)
 190                 return 0;
 191         for (p = state->selector_map; p->id; p++) {
 192                 if (p->id == unitid && index < p->count)
 193                         return strlcpy(buf, p->names[index], buflen);
 194         }
 195         return 0;
 196 }
 197
 198 /*
 199  * find an audio control unit with the given unit id
 200  */
 201 static void *find_audio_control_unit(struct mixer_build *state, unsigned char unit)
 202 {
 203         unsigned char *p;
 204
 205         p = NULL;
 206         while ((p = snd_usb_find_desc(state->buffer, state->buflen, p,
 207                                       USB_DT_CS_INTERFACE)) != NULL) {
 208                 if (p[0] >= 4 && p[2] >= UAC_INPUT_TERMINAL && p[2] <= UAC_EXTENSION_UNIT_V1 && p[3] == unit)
 209                         return p;
 210         }
 211         return NULL;
 212 }
 213
 214
 215 /*
 216  * copy a string with the given id
 217  */
 218 static int snd_usb_copy_string_desc(struct mixer_build *state, int index, char *buf, int maxlen)
 219 {
 220         int len = usb_string(state->chip->dev, index, buf, maxlen - 1);
 221         buf[len] = 0;
 222         return len;
 223 }
 224
 225 /*
 226  * convert from the byte/word on usb descriptor to the zero-based integer
 227  */
 228 static int convert_signed_value(struct usb_mixer_elem_info *cval, int val)
 229 {
 230         switch (cval->val_type) {
 231         case USB_MIXER_BOOLEAN:
 232                 return !!val;
 233         case USB_MIXER_INV_BOOLEAN:
 234                 return !val;
 235         case USB_MIXER_U8:
 236                 val &= 0xff;
 237                 break;
 238         case USB_MIXER_S8:
 239                 val &= 0xff;
 240                 if (val >= 0x80)
 241                         val -= 0x100;
 242                 break;
 243         case USB_MIXER_U16:
 244                 val &= 0xffff;
 245                 break;
 246         case USB_MIXER_S16:
 247                 val &= 0xffff;
 248                 if (val >= 0x8000)
 249                         val -= 0x10000;
 250                 break;
 251         }
 252         return val;
 253 }
 254
 255 /*
 256  * convert from the zero-based int to the byte/word for usb descriptor
 257  */
 258 static int convert_bytes_value(struct usb_mixer_elem_info *cval, int val)
 259 {
 260         switch (cval->val_type) {
 261         case USB_MIXER_BOOLEAN:
 262                 return !!val;
 263         case USB_MIXER_INV_BOOLEAN:
 264                 return !val;
 265         case USB_MIXER_S8:
 266         case USB_MIXER_U8:
 267                 return val & 0xff;
 268         case USB_MIXER_S16:
 269         case USB_MIXER_U16:
 270                 return val & 0xffff;
 271         }
 272         return 0; /* not reached */
 273 }
 274
 275 static int get_relative_value(struct usb_mixer_elem_info *cval, int val)
 276 {
 277         if (! cval->res)
 278                 cval->res = 1;
 279         if (val < cval->min)
 280                 return 0;
 281         else if (val >= cval->max)
 282                 return (cval->max - cval->min + cval->res - 1) / cval->res;
 283         else
 284                 return (val - cval->min) / cval->res;
 285 }
 286
 287 static int get_abs_value(struct usb_mixer_elem_info *cval, int val)
 288 {
 289         if (val < 0)
 290                 return cval->min;
 291         if (! cval->res)
 292                 cval->res = 1;
 293         val *= cval->res;
 294         val += cval->min;
 295         if (val > cval->max)
 296                 return cval->max;
 297         return val;
 298 }
 299
 300
 301 /*
 302  * retrieve a mixer value
 303  */
 304
 305 static int get_ctl_value(struct usb_mixer_elem_info *cval, int request, int validx, int *value_ret)
 306 {
 307         unsigned char buf[2];
 308         int val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
 309         int timeout = 10;
 310
 311         while (timeout-- > 0) {
 312                 if (snd_usb_ctl_msg(cval->mixer->chip->dev,
 313                                     usb_rcvctrlpipe(cval->mixer->chip->dev, 0),
 314                                     request,
 315                                     USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
 316                                     validx, cval->mixer->ctrlif | (cval->id << 8),
 317                                     buf, val_len, 100) >= val_len) {
 318                         *value_ret = convert_signed_value(cval, snd_usb_combine_bytes(buf, val_len));
 319                         return 0;
 320                 }
 321         }
 322         snd_printdd(KERN_ERR "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
 323                     request, validx, cval->mixer->ctrlif | (cval->id << 8), cval->val_type);
 324         return -EINVAL;
 325 }
 326
 327 static int get_cur_ctl_value(struct usb_mixer_elem_info *cval, int validx, int *value)
 328 {
 329         return get_ctl_value(cval, UAC_GET_CUR, validx, value);
 330 }
 331
 332 /* channel = 0: master, 1 = first channel */
 333 static inline int get_cur_mix_raw(struct usb_mixer_elem_info *cval,
 334                                   int channel, int *value)
 335 {
 336         return get_ctl_value(cval, UAC_GET_CUR, (cval->control << 8) | channel, value);
 337 }
 338
 339 static int get_cur_mix_value(struct usb_mixer_elem_info *cval,
 340                              int channel, int index, int *value)
 341 {
 342         int err;
 343
 344         if (cval->cached & (1 << channel)) {
 345                 *value = cval->cache_val[index];
 346                 return 0;
 347         }
 348         err = get_cur_mix_raw(cval, channel, value);
 349         if (err < 0) {
 350                 if (!cval->mixer->ignore_ctl_error)
 351                         snd_printd(KERN_ERR "cannot get current value for "
 352                                    "control %d ch %d: err = %d\n",
 353                                    cval->control, channel, err);
 354                 return err;
 355         }
 356         cval->cached |= 1 << channel;
 357         cval->cache_val[index] = *value;
 358         return 0;
 359 }
 360
 361
 362 /*
 363  * set a mixer value
 364  */
 365
 366 int snd_usb_mixer_set_ctl_value(struct usb_mixer_elem_info *cval,
 367                                 int request, int validx, int value_set)
 368 {
 369         unsigned char buf[2];
 370         int val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
 371         int timeout = 10;
 372
 373         value_set = convert_bytes_value(cval, value_set);
 374         buf[0] = value_set & 0xff;
 375         buf[1] = (value_set >> 8) & 0xff;
 376         while (timeout-- > 0)
 377                 if (snd_usb_ctl_msg(cval->mixer->chip->dev,
 378                                     usb_sndctrlpipe(cval->mixer->chip->dev, 0),
 379                                     request,
 380                                     USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
 381                                     validx, cval->mixer->ctrlif | (cval->id << 8),
 382                                     buf, val_len, 100) >= 0)
 383                         return 0;
 384         snd_printdd(KERN_ERR "cannot set ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d, data = %#x/%#x\n",
 385                     request, validx, cval->mixer->ctrlif | (cval->id << 8), cval->val_type, buf[0], buf[1]);
 386         return -EINVAL;
 387 }
 388
 389 static int set_cur_ctl_value(struct usb_mixer_elem_info *cval, int validx, int value)
 390 {
 391         return snd_usb_mixer_set_ctl_value(cval, UAC_SET_CUR, validx, value);
 392 }
 393
 394 static int set_cur_mix_value(struct usb_mixer_elem_info *cval, int channel,
 395                              int index, int value)
 396 {
 397         int err;
 398         err = snd_usb_mixer_set_ctl_value(cval, UAC_SET_CUR, (cval->control << 8) | channel,
 399                             value);
 400         if (err < 0)
 401                 return err;
 402         cval->cached |= 1 << channel;
 403         cval->cache_val[index] = value;
 404         return 0;
 405 }
 406
 407 /*
 408  * TLV callback for mixer volume controls
 409  */
 410 static int mixer_vol_tlv(struct snd_kcontrol *kcontrol, int op_flag,
 411                          unsigned int size, unsigned int __user *_tlv)
 412 {
 413         struct usb_mixer_elem_info *cval = kcontrol->private_data;
 414         DECLARE_TLV_DB_MINMAX(scale, 0, 0);
 415
 416         if (size < sizeof(scale))
 417                 return -ENOMEM;
 418         scale[2] = cval->dBmin;
 419         scale[3] = cval->dBmax;
 420         if (copy_to_user(_tlv, scale, sizeof(scale)))
 421                 return -EFAULT;
 422         return 0;
 423 }
 424
 425 /*
 426  * parser routines begin here...
 427  */
 428
 429 static int parse_audio_unit(struct mixer_build *state, int unitid);
 430
 431
 432 /*
 433  * check if the input/output channel routing is enabled on the given bitmap.
 434  * used for mixer unit parser
 435  */
 436 static int check_matrix_bitmap(unsigned char *bmap, int ich, int och, int num_outs)
 437 {
 438         int idx = ich * num_outs + och;
 439         return bmap[idx >> 3] & (0x80 >> (idx & 7));
 440 }
 441
 442
 443 /*
 444  * add an alsa control element
 445  * search and increment the index until an empty slot is found.
 446  *
 447  * if failed, give up and free the control instance.
 448  */
 449
 450 static int add_control_to_empty(struct mixer_build *state, struct snd_kcontrol *kctl)
 451 {
 452         struct usb_mixer_elem_info *cval = kctl->private_data;
 453         int err;
 454
 455         while (snd_ctl_find_id(state->chip->card, &kctl->id))
 456                 kctl->id.index++;
 457         if ((err = snd_ctl_add(state->chip->card, kctl)) < 0) {
 458                 snd_printd(KERN_ERR "cannot add control (err = %d)\n", err);
 459                 return err;
 460         }
 461         cval->elem_id = &kctl->id;
 462         cval->next_id_elem = state->mixer->id_elems[cval->id];
 463         state->mixer->id_elems[cval->id] = cval;
 464         return 0;
 465 }
 466
 467
 468 /*
 469  * get a terminal name string
 470  */
 471
 472 static struct iterm_name_combo {
 473         int type;
 474         char *name;
 475 } iterm_names[] = {
 476         { 0x0300, "Output" },
 477         { 0x0301, "Speaker" },
 478         { 0x0302, "Headphone" },
 479         { 0x0303, "HMD Audio" },
 480         { 0x0304, "Desktop Speaker" },
 481         { 0x0305, "Room Speaker" },
 482         { 0x0306, "Com Speaker" },
 483         { 0x0307, "LFE" },
 484         { 0x0600, "External In" },
 485         { 0x0601, "Analog In" },
 486         { 0x0602, "Digital In" },
 487         { 0x0603, "Line" },
 488         { 0x0604, "Legacy In" },
 489         { 0x0605, "IEC958 In" },
 490         { 0x0606, "1394 DA Stream" },
 491         { 0x0607, "1394 DV Stream" },
 492         { 0x0700, "Embedded" },
 493         { 0x0701, "Noise Source" },
 494         { 0x0702, "Equalization Noise" },
 495         { 0x0703, "CD" },
 496         { 0x0704, "DAT" },
 497         { 0x0705, "DCC" },
 498         { 0x0706, "MiniDisk" },
 499         { 0x0707, "Analog Tape" },
 500         { 0x0708, "Phonograph" },
 501         { 0x0709, "VCR Audio" },
 502         { 0x070a, "Video Disk Audio" },
 503         { 0x070b, "DVD Audio" },
 504         { 0x070c, "TV Tuner Audio" },
 505         { 0x070d, "Satellite Rec Audio" },
 506         { 0x070e, "Cable Tuner Audio" },
 507         { 0x070f, "DSS Audio" },
 508         { 0x0710, "Radio Receiver" },
 509         { 0x0711, "Radio Transmitter" },
 510         { 0x0712, "Multi-Track Recorder" },
 511         { 0x0713, "Synthesizer" },
 512         { 0 },
 513 };
 514
 515 static int get_term_name(struct mixer_build *state, struct usb_audio_term *iterm,
 516                          unsigned char *name, int maxlen, int term_only)
 517 {
 518         struct iterm_name_combo *names;
 519
 520         if (iterm->name)
 521                 return snd_usb_copy_string_desc(state, iterm->name, name, maxlen);
 522
 523         /* virtual type - not a real terminal */
 524         if (iterm->type >> 16) {
 525                 if (term_only)
 526                         return 0;
 527                 switch (iterm->type >> 16) {
 528                 case UAC_SELECTOR_UNIT:
 529                         strcpy(name, "Selector"); return 8;
 530                 case UAC_PROCESSING_UNIT_V1:
 531                         strcpy(name, "Process Unit"); return 12;
 532                 case UAC_EXTENSION_UNIT_V1:
 533                         strcpy(name, "Ext Unit"); return 8;
 534                 case UAC_MIXER_UNIT:
 535                         strcpy(name, "Mixer"); return 5;
 536                 default:
 537                         return sprintf(name, "Unit %d", iterm->id);
 538                 }
 539         }
 540
 541         switch (iterm->type & 0xff00) {
 542         case 0x0100:
 543                 strcpy(name, "PCM"); return 3;
 544         case 0x0200:
 545                 strcpy(name, "Mic"); return 3;
 546         case 0x0400:
 547                 strcpy(name, "Headset"); return 7;
 548         case 0x0500:
 549                 strcpy(name, "Phone"); return 5;
 550         }
 551
 552         for (names = iterm_names; names->type; names++)
 553                 if (names->type == iterm->type) {
 554                         strcpy(name, names->name);
 555                         return strlen(names->name);
 556                 }
 557         return 0;
 558 }
 559
 560
 561 /*
 562  * parse the source unit recursively until it reaches to a terminal
 563  * or a branched unit.
 564  */
 565 static int check_input_term(struct mixer_build *state, int id, struct usb_audio_term *term)
 566 {
 567         unsigned char *p1;
 568
 569         memset(term, 0, sizeof(*term));
 570         while ((p1 = find_audio_control_unit(state, id)) != NULL) {
 571                 term->id = id;
 572                 switch (p1[2]) {
 573                 case UAC_INPUT_TERMINAL:
 574                         term->type = combine_word(p1 + 4);
 575                         term->channels = p1[7];
 576                         term->chconfig = combine_word(p1 + 8);
 577                         term->name = p1[11];
 578                         return 0;
 579                 case UAC_FEATURE_UNIT:
 580                         id = p1[4];
 581                         break; /* continue to parse */
 582                 case UAC_MIXER_UNIT:
 583                         term->type = p1[2] << 16; /* virtual type */
 584                         term->channels = p1[5 + p1[4]];
 585                         term->chconfig = combine_word(p1 + 6 + p1[4]);
 586                         term->name = p1[p1[0] - 1];
 587                         return 0;
 588                 case UAC_SELECTOR_UNIT:
 589                         /* call recursively to retrieve the channel info */
 590                         if (check_input_term(state, p1[5], term) < 0)
 591                                 return -ENODEV;
 592                         term->type = p1[2] << 16; /* virtual type */
 593                         term->id = id;
 594                         term->name = p1[9 + p1[0] - 1];
 595                         return 0;
 596                 case UAC_PROCESSING_UNIT_V1:
 597                 case UAC_EXTENSION_UNIT_V1:
 598                         if (p1[6] == 1) {
 599                                 id = p1[7];
 600                                 break; /* continue to parse */
 601                         }
 602                         term->type = p1[2] << 16; /* virtual type */
 603                         term->channels = p1[7 + p1[6]];
 604                         term->chconfig = combine_word(p1 + 8 + p1[6]);
 605                         term->name = p1[12 + p1[6] + p1[11 + p1[6]]];
 606                         return 0;
 607                 default:
 608                         return -ENODEV;
 609                 }
 610         }
 611         return -ENODEV;
 612 }
 613
 614
 615 /*
 616  * Feature Unit
 617  */
 618
 619 /* feature unit control information */
 620 struct usb_feature_control_info {
 621         const char *name;
 622         unsigned int type;      /* control type (mute, volume, etc.) */
 623 };
 624
 625 static struct usb_feature_control_info audio_feature_info[] = {
 626         { "Mute",               USB_MIXER_INV_BOOLEAN },
 627         { "Volume",             USB_MIXER_S16 },
 628         { "Tone Control - Bass",        USB_MIXER_S8 },
 629         { "Tone Control - Mid",         USB_MIXER_S8 },
 630         { "Tone Control - Treble",      USB_MIXER_S8 },
 631         { "Graphic Equalizer",          USB_MIXER_S8 }, /* FIXME: not implemeted yet */
 632         { "Auto Gain Control",  USB_MIXER_BOOLEAN },
 633         { "Delay Control",      USB_MIXER_U16 },
 634         { "Bass Boost",         USB_MIXER_BOOLEAN },
 635         { "Loudness",           USB_MIXER_BOOLEAN },
 636 };
 637
 638
 639 /* private_free callback */
 640 static void usb_mixer_elem_free(struct snd_kcontrol *kctl)
 641 {
 642         kfree(kctl->private_data);
 643         kctl->private_data = NULL;
 644 }
 645
 646
 647 /*
 648  * interface to ALSA control for feature/mixer units
 649  */
 650
 651 /*
 652  * retrieve the minimum and maximum values for the specified control
 653  */
 654 static int get_min_max(struct usb_mixer_elem_info *cval, int default_min)
 655 {
 656         /* for failsafe */
 657         cval->min = default_min;
 658         cval->max = cval->min + 1;
 659         cval->res = 1;
 660         cval->dBmin = cval->dBmax = 0;
 661
 662         if (cval->val_type == USB_MIXER_BOOLEAN ||
 663             cval->val_type == USB_MIXER_INV_BOOLEAN) {
 664                 cval->initialized = 1;
 665         } else {
 666                 int minchn = 0;
 667                 if (cval->cmask) {
 668                         int i;
 669                         for (i = 0; i < MAX_CHANNELS; i++)
 670                                 if (cval->cmask & (1 << i)) {
 671                                         minchn = i + 1;
 672                                         break;
 673                                 }
 674                 }
 675                 if (get_ctl_value(cval, UAC_GET_MAX, (cval->control << 8) | minchn, &cval->max) < 0 ||
 676                     get_ctl_value(cval, UAC_GET_MIN, (cval->control << 8) | minchn, &cval->min) < 0) {
 677                         snd_printd(KERN_ERR "%d:%d: cannot get min/max values for control %d (id %d)\n",
 678                                    cval->id, cval->mixer->ctrlif, cval->control, cval->id);
 679                         return -EINVAL;
 680                 }
 681                 if (get_ctl_value(cval, UAC_GET_RES, (cval->control << 8) | minchn, &cval->res) < 0) {
 682                         cval->res = 1;
 683                 } else {
 684                         int last_valid_res = cval->res;
 685
 686                         while (cval->res > 1) {
 687                                 if (snd_usb_mixer_set_ctl_value(cval, UAC_SET_RES,
 688                                                                 (cval->control << 8) | minchn, cval->res / 2) < 0)
 689                                         break;
 690                                 cval->res /= 2;
 691                         }
 692                         if (get_ctl_value(cval, UAC_GET_RES, (cval->control << 8) | minchn, &cval->res) < 0)
 693                                 cval->res = last_valid_res;
 694                 }
 695                 if (cval->res == 0)
 696                         cval->res = 1;
 697
 698                 /* Additional checks for the proper resolution
 699                  *
 700                  * Some devices report smaller resolutions than actually
 701                  * reacting.  They don't return errors but simply clip
 702                  * to the lower aligned value.
 703                  */
 704                 if (cval->min + cval->res < cval->max) {
 705                         int last_valid_res = cval->res;
 706                         int saved, test, check;
 707                         get_cur_mix_raw(cval, minchn, &saved);
 708                         for (;;) {
 709                                 test = saved;
 710                                 if (test < cval->max)
 711                                         test += cval->res;
 712                                 else
 713                                         test -= cval->res;
 714                                 if (test < cval->min || test > cval->max ||
 715                                     set_cur_mix_value(cval, minchn, 0, test) ||
 716                                     get_cur_mix_raw(cval, minchn, &check)) {
 717                                         cval->res = last_valid_res;
 718                                         break;
 719                                 }
 720                                 if (test == check)
 721                                         break;
 722                                 cval->res *= 2;
 723                         }
 724                         set_cur_mix_value(cval, minchn, 0, saved);
 725                 }
 726
 727                 cval->initialized = 1;
 728         }
 729
 730         /* USB descriptions contain the dB scale in 1/256 dB unit
 731          * while ALSA TLV contains in 1/100 dB unit
 732          */
 733         cval->dBmin = (convert_signed_value(cval, cval->min) * 100) / 256;
 734         cval->dBmax = (convert_signed_value(cval, cval->max) * 100) / 256;
 735         if (cval->dBmin > cval->dBmax) {
 736                 /* something is wrong; assume it's either from/to 0dB */
 737                 if (cval->dBmin < 0)
 738                         cval->dBmax = 0;
 739                 else if (cval->dBmin > 0)
 740                         cval->dBmin = 0;
 741                 if (cval->dBmin > cval->dBmax) {
 742                         /* totally crap, return an error */
 743                         return -EINVAL;
 744                 }
 745         }
 746
 747         return 0;
 748 }
 749
 750
 751 /* get a feature/mixer unit info */
 752 static int mixer_ctl_feature_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
 753 {
 754         struct usb_mixer_elem_info *cval = kcontrol->private_data;
 755
 756         if (cval->val_type == USB_MIXER_BOOLEAN ||
 757             cval->val_type == USB_MIXER_INV_BOOLEAN)
 758                 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
 759         else
 760                 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 761         uinfo->count = cval->channels;
 762         if (cval->val_type == USB_MIXER_BOOLEAN ||
 763             cval->val_type == USB_MIXER_INV_BOOLEAN) {
 764                 uinfo->value.integer.min = 0;
 765                 uinfo->value.integer.max = 1;
 766         } else {
 767                 if (! cval->initialized)
 768                         get_min_max(cval,  0);
 769                 uinfo->value.integer.min = 0;
 770                 uinfo->value.integer.max =
 771                         (cval->max - cval->min + cval->res - 1) / cval->res;
 772         }
 773         return 0;
 774 }
 775
 776 /* get the current value from feature/mixer unit */
 777 static int mixer_ctl_feature_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
 778 {
 779         struct usb_mixer_elem_info *cval = kcontrol->private_data;
 780         int c, cnt, val, err;
 781
 782         ucontrol->value.integer.value[0] = cval->min;
 783         if (cval->cmask) {
 784                 cnt = 0;
 785                 for (c = 0; c < MAX_CHANNELS; c++) {
 786                         if (!(cval->cmask & (1 << c)))
 787                                 continue;
 788                         err = get_cur_mix_value(cval, c + 1, cnt, &val);
 789                         if (err < 0)
 790                                 return cval->mixer->ignore_ctl_error ? 0 : err;
 791                         val = get_relative_value(cval, val);
 792                         ucontrol->value.integer.value[cnt] = val;
 793                         cnt++;
 794                 }
 795                 return 0;
 796         } else {
 797                 /* master channel */
 798                 err = get_cur_mix_value(cval, 0, 0, &val);
 799                 if (err < 0)
 800                         return cval->mixer->ignore_ctl_error ? 0 : err;
 801                 val = get_relative_value(cval, val);
 802                 ucontrol->value.integer.value[0] = val;
 803         }
 804         return 0;
 805 }
 806
 807 /* put the current value to feature/mixer unit */
 808 static int mixer_ctl_feature_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
 809 {
 810         struct usb_mixer_elem_info *cval = kcontrol->private_data;
 811         int c, cnt, val, oval, err;
 812         int changed = 0;
 813
 814         if (cval->cmask) {
 815                 cnt = 0;
 816                 for (c = 0; c < MAX_CHANNELS; c++) {
 817                         if (!(cval->cmask & (1 << c)))
 818                                 continue;
 819                         err = get_cur_mix_value(cval, c + 1, cnt, &oval);
 820                         if (err < 0)
 821                                 return cval->mixer->ignore_ctl_error ? 0 : err;
 822                         val = ucontrol->value.integer.value[cnt];
 823                         val = get_abs_value(cval, val);
 824                         if (oval != val) {
 825                                 set_cur_mix_value(cval, c + 1, cnt, val);
 826                                 changed = 1;
 827                         }
 828                         cnt++;
 829                 }
 830         } else {
 831                 /* master channel */
 832                 err = get_cur_mix_value(cval, 0, 0, &oval);
 833                 if (err < 0)
 834                         return cval->mixer->ignore_ctl_error ? 0 : err;
 835                 val = ucontrol->value.integer.value[0];
 836                 val = get_abs_value(cval, val);
 837                 if (val != oval) {
 838                         set_cur_mix_value(cval, 0, 0, val);
 839                         changed = 1;
 840                 }
 841         }
 842         return changed;
 843 }
 844
 845 static struct snd_kcontrol_new usb_feature_unit_ctl = {
 846         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 847         .name = "", /* will be filled later manually */
 848         .info = mixer_ctl_feature_info,
 849         .get = mixer_ctl_feature_get,
 850         .put = mixer_ctl_feature_put,
 851 };
 852
 853
 854 /*
 855  * build a feature control
 856  */
 857
 858 static size_t append_ctl_name(struct snd_kcontrol *kctl, const char *str)
 859 {
 860         return strlcat(kctl->id.name, str, sizeof(kctl->id.name));
 861 }
 862
 863 static void build_feature_ctl(struct mixer_build *state, void *raw_desc,
 864                               unsigned int ctl_mask, int control,
 865                               struct usb_audio_term *iterm, int unitid)
 866 {
 867         struct uac_feature_unit_descriptor *desc = raw_desc;
 868         unsigned int len = 0;
 869         int mapped_name = 0;
 870         int nameid = uac_feature_unit_iFeature(desc);
 871         struct snd_kcontrol *kctl;
 872         struct usb_mixer_elem_info *cval;
 873         const struct usbmix_name_map *map;
 874
 875         control++; /* change from zero-based to 1-based value */
 876
 877         if (control == UAC_GRAPHIC_EQUALIZER_CONTROL) {
 878                 /* FIXME: not supported yet */
 879                 return;
 880         }
 881
 882         map = find_map(state, unitid, control);
 883         if (check_ignored_ctl(map))
 884                 return;
 885
 886         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
 887         if (! cval) {
 888                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
 889                 return;
 890         }
 891         cval->mixer = state->mixer;
 892         cval->id = unitid;
 893         cval->control = control;
 894         cval->cmask = ctl_mask;
 895         cval->val_type = audio_feature_info[control-1].type;
 896         if (ctl_mask == 0)
 897                 cval->channels = 1;     /* master channel */
 898         else {
 899                 int i, c = 0;
 900                 for (i = 0; i < 16; i++)
 901                         if (ctl_mask & (1 << i))
 902                                 c++;
 903                 cval->channels = c;
 904         }
 905
 906         /* get min/max values */
 907         get_min_max(cval, 0);
 908
 909         kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
 910         if (! kctl) {
 911                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
 912                 kfree(cval);
 913                 return;
 914         }
 915         kctl->private_free = usb_mixer_elem_free;
 916
 917         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
 918         mapped_name = len != 0;
 919         if (! len && nameid)
 920                 len = snd_usb_copy_string_desc(state, nameid,
 921                                 kctl->id.name, sizeof(kctl->id.name));
 922
 923         switch (control) {
 924         case UAC_MUTE_CONTROL:
 925         case UAC_VOLUME_CONTROL:
 926                 /* determine the control name.  the rule is:
 927                  * - if a name id is given in descriptor, use it.
 928                  * - if the connected input can be determined, then use the name
 929                  *   of terminal type.
 930                  * - if the connected output can be determined, use it.
 931                  * - otherwise, anonymous name.
 932                  */
 933                 if (! len) {
 934                         len = get_term_name(state, iterm, kctl->id.name, sizeof(kctl->id.name), 1);
 935                         if (! len)
 936                                 len = get_term_name(state, &state->oterm, kctl->id.name, sizeof(kctl->id.name), 1);
 937                         if (! len)
 938                                 len = snprintf(kctl->id.name, sizeof(kctl->id.name),
 939                                                "Feature %d", unitid);
 940                 }
 941                 /* determine the stream direction:
 942                  * if the connected output is USB stream, then it's likely a
 943                  * capture stream.  otherwise it should be playback (hopefully :)
 944                  */
 945                 if (! mapped_name && ! (state->oterm.type >> 16)) {
 946                         if ((state->oterm.type & 0xff00) == 0x0100) {
 947                                 len = append_ctl_name(kctl, " Capture");
 948                         } else {
 949                                 len = append_ctl_name(kctl, " Playback");
 950                         }
 951                 }
 952                 append_ctl_name(kctl, control == UAC_MUTE_CONTROL ?
 953                                 " Switch" : " Volume");
 954                 if (control == UAC_VOLUME_CONTROL) {
 955                         kctl->tlv.c = mixer_vol_tlv;
 956                         kctl->vd[0].access |=
 957                                 SNDRV_CTL_ELEM_ACCESS_TLV_READ |
 958                                 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
 959                         check_mapped_dB(map, cval);
 960                 }
 961                 break;
 962
 963         default:
 964                 if (! len)
 965                         strlcpy(kctl->id.name, audio_feature_info[control-1].name,
 966                                 sizeof(kctl->id.name));
 967                 break;
 968         }
 969
 970         /* volume control quirks */
 971         switch (state->chip->usb_id) {
 972         case USB_ID(0x0471, 0x0101):
 973         case USB_ID(0x0471, 0x0104):
 974         case USB_ID(0x0471, 0x0105):
 975         case USB_ID(0x0672, 0x1041):
 976         /* quirk for UDA1321/N101.
 977          * note that detection between firmware 2.1.1.7 (N101)
 978          * and later 2.1.1.21 is not very clear from datasheets.
 979          * I hope that the min value is -15360 for newer firmware --jk
 980          */
 981                 if (!strcmp(kctl->id.name, "PCM Playback Volume") &&
 982                     cval->min == -15616) {
 983                         snd_printk(KERN_INFO
 984                                  "set volume quirk for UDA1321/N101 chip\n");
 985                         cval->max = -256;
 986                 }
 987                 break;
 988
 989         case USB_ID(0x046d, 0x09a4):
 990                 if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
 991                         snd_printk(KERN_INFO
 992                                 "set volume quirk for QuickCam E3500\n");
 993                         cval->min = 6080;
 994                         cval->max = 8768;
 995                         cval->res = 192;
 996                 }
 997                 break;
 998
 999         }
1000
1001         snd_printdd(KERN_INFO "[%d] FU [%s] ch = %d, val = %d/%d/%d\n",
1002                     cval->id, kctl->id.name, cval->channels, cval->min, cval->max, cval->res);
1003         add_control_to_empty(state, kctl);
1004 }
1005
1006
1007
1008 /*
1009  * parse a feature unit
1010  *
1011  * most of controlls are defined here.
1012  */
1013 static int parse_audio_feature_unit(struct mixer_build *state, int unitid, void *_ftr)
1014 {
1015         int channels, i, j;
1016         struct usb_audio_term iterm;
1017         unsigned int master_bits, first_ch_bits;
1018         int err, csize;
1019         struct uac_feature_unit_descriptor *ftr = _ftr;
1020
1021         if (ftr->bLength < 7 || ! (csize = ftr->bControlSize) || ftr->bLength < 7 + csize) {
1022                 snd_printk(KERN_ERR "usbaudio: unit %u: invalid UAC_FEATURE_UNIT descriptor\n", unitid);
1023                 return -EINVAL;
1024         }
1025
1026         /* parse the source unit */
1027         if ((err = parse_audio_unit(state, ftr->bSourceID)) < 0)
1028                 return err;
1029
1030         /* determine the input source type and name */
1031         if (check_input_term(state, ftr->bSourceID, &iterm) < 0)
1032                 return -EINVAL;
1033
1034         channels = (ftr->bLength - 7) / csize - 1;
1035
1036         master_bits = snd_usb_combine_bytes(ftr->bmaControls, csize);
1037         /* master configuration quirks */
1038         switch (state->chip->usb_id) {
1039         case USB_ID(0x08bb, 0x2702):
1040                 snd_printk(KERN_INFO
1041                            "usbmixer: master volume quirk for PCM2702 chip\n");
1042                 /* disable non-functional volume control */
1043                 master_bits &= ~UAC_FU_VOLUME;
1044                 break;
1045         }
1046         if (channels > 0)
1047                 first_ch_bits = snd_usb_combine_bytes(ftr->bmaControls + csize, csize);
1048         else
1049                 first_ch_bits = 0;
1050         /* check all control types */
1051         for (i = 0; i < 10; i++) {
1052                 unsigned int ch_bits = 0;
1053                 for (j = 0; j < channels; j++) {
1054                         unsigned int mask = snd_usb_combine_bytes(ftr->bmaControls + csize * (j+1), csize);
1055                         if (mask & (1 << i))
1056                                 ch_bits |= (1 << j);
1057                 }
1058                 if (ch_bits & 1) /* the first channel must be set (for ease of programming) */
1059                         build_feature_ctl(state, _ftr, ch_bits, i, &iterm, unitid);
1060                 if (master_bits & (1 << i))
1061                         build_feature_ctl(state, _ftr, 0, i, &iterm, unitid);
1062         }
1063
1064         return 0;
1065 }
1066
1067
1068 /*
1069  * Mixer Unit
1070  */
1071
1072 /*
1073  * build a mixer unit control
1074  *
1075  * the callbacks are identical with feature unit.
1076  * input channel number (zero based) is given in control field instead.
1077  */
1078
1079 static void build_mixer_unit_ctl(struct mixer_build *state,
1080                                  struct uac_mixer_unit_descriptor *desc,
1081                                  int in_pin, int in_ch, int unitid,
1082                                  struct usb_audio_term *iterm)
1083 {
1084         struct usb_mixer_elem_info *cval;
1085         unsigned int num_outs = uac_mixer_unit_bNrChannels(desc);
1086         unsigned int i, len;
1087         struct snd_kcontrol *kctl;
1088         const struct usbmix_name_map *map;
1089
1090         map = find_map(state, unitid, 0);
1091         if (check_ignored_ctl(map))
1092                 return;
1093
1094         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1095         if (! cval)
1096                 return;
1097
1098         cval->mixer = state->mixer;
1099         cval->id = unitid;
1100         cval->control = in_ch + 1; /* based on 1 */
1101         cval->val_type = USB_MIXER_S16;
1102         for (i = 0; i < num_outs; i++) {
1103                 if (check_matrix_bitmap(uac_mixer_unit_bmControls(desc), in_ch, i, num_outs)) {
1104                         cval->cmask |= (1 << i);
1105                         cval->channels++;
1106                 }
1107         }
1108
1109         /* get min/max values */
1110         get_min_max(cval, 0);
1111
1112         kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
1113         if (! kctl) {
1114                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1115                 kfree(cval);
1116                 return;
1117         }
1118         kctl->private_free = usb_mixer_elem_free;
1119
1120         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
1121         if (! len)
1122                 len = get_term_name(state, iterm, kctl->id.name, sizeof(kctl->id.name), 0);
1123         if (! len)
1124                 len = sprintf(kctl->id.name, "Mixer Source %d", in_ch + 1);
1125         append_ctl_name(kctl, " Volume");
1126
1127         snd_printdd(KERN_INFO "[%d] MU [%s] ch = %d, val = %d/%d\n",
1128                     cval->id, kctl->id.name, cval->channels, cval->min, cval->max);
1129         add_control_to_empty(state, kctl);
1130 }
1131
1132
1133 /*
1134  * parse a mixer unit
1135  */
1136 static int parse_audio_mixer_unit(struct mixer_build *state, int unitid, void *raw_desc)
1137 {
1138         struct uac_mixer_unit_descriptor *desc = raw_desc;
1139         struct usb_audio_term iterm;
1140         int input_pins, num_ins, num_outs;
1141         int pin, ich, err;
1142
1143         if (desc->bLength < 11 || ! (input_pins = desc->bNrInPins) || ! (num_outs = uac_mixer_unit_bNrChannels(desc))) {
1144                 snd_printk(KERN_ERR "invalid MIXER UNIT descriptor %d\n", unitid);
1145                 return -EINVAL;
1146         }
1147         /* no bmControls field (e.g. Maya44) -> ignore */
1148         if (desc->bLength <= 10 + input_pins) {
1149                 snd_printdd(KERN_INFO "MU %d has no bmControls field\n", unitid);
1150                 return 0;
1151         }
1152
1153         num_ins = 0;
1154         ich = 0;
1155         for (pin = 0; pin < input_pins; pin++) {
1156                 err = parse_audio_unit(state, desc->baSourceID[pin]);
1157                 if (err < 0)
1158                         return err;
1159                 err = check_input_term(state, desc->baSourceID[pin], &iterm);
1160                 if (err < 0)
1161                         return err;
1162                 num_ins += iterm.channels;
1163                 for (; ich < num_ins; ++ich) {
1164                         int och, ich_has_controls = 0;
1165
1166                         for (och = 0; och < num_outs; ++och) {
1167                                 if (check_matrix_bitmap(uac_mixer_unit_bmControls(desc),
1168                                                         ich, och, num_outs)) {
1169                                         ich_has_controls = 1;
1170                                         break;
1171                                 }
1172                         }
1173                         if (ich_has_controls)
1174                                 build_mixer_unit_ctl(state, desc, pin, ich,
1175                                                      unitid, &iterm);
1176                 }
1177         }
1178         return 0;
1179 }
1180
1181
1182 /*
1183  * Processing Unit / Extension Unit
1184  */
1185
1186 /* get callback for processing/extension unit */
1187 static int mixer_ctl_procunit_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1188 {
1189         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1190         int err, val;
1191
1192         err = get_cur_ctl_value(cval, cval->control << 8, &val);
1193         if (err < 0 && cval->mixer->ignore_ctl_error) {
1194                 ucontrol->value.integer.value[0] = cval->min;
1195                 return 0;
1196         }
1197         if (err < 0)
1198                 return err;
1199         val = get_relative_value(cval, val);
1200         ucontrol->value.integer.value[0] = val;
1201         return 0;
1202 }
1203
1204 /* put callback for processing/extension unit */
1205 static int mixer_ctl_procunit_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1206 {
1207         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1208         int val, oval, err;
1209
1210         err = get_cur_ctl_value(cval, cval->control << 8, &oval);
1211         if (err < 0) {
1212                 if (cval->mixer->ignore_ctl_error)
1213                         return 0;
1214                 return err;
1215         }
1216         val = ucontrol->value.integer.value[0];
1217         val = get_abs_value(cval, val);
1218         if (val != oval) {
1219                 set_cur_ctl_value(cval, cval->control << 8, val);
1220                 return 1;
1221         }
1222         return 0;
1223 }
1224
1225 /* alsa control interface for processing/extension unit */
1226 static struct snd_kcontrol_new mixer_procunit_ctl = {
1227         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1228         .name = "", /* will be filled later */
1229         .info = mixer_ctl_feature_info,
1230         .get = mixer_ctl_procunit_get,
1231         .put = mixer_ctl_procunit_put,
1232 };
1233
1234
1235 /*
1236  * predefined data for processing units
1237  */
1238 struct procunit_value_info {
1239         int control;
1240         char *suffix;
1241         int val_type;
1242         int min_value;
1243 };
1244
1245 struct procunit_info {
1246         int type;
1247         char *name;
1248         struct procunit_value_info *values;
1249 };
1250
1251 static struct procunit_value_info updown_proc_info[] = {
1252         { USB_PROC_UPDOWN_SWITCH, "Switch", USB_MIXER_BOOLEAN },
1253         { USB_PROC_UPDOWN_MODE_SEL, "Mode Select", USB_MIXER_U8, 1 },
1254         { 0 }
1255 };
1256 static struct procunit_value_info prologic_proc_info[] = {
1257         { USB_PROC_PROLOGIC_SWITCH, "Switch", USB_MIXER_BOOLEAN },
1258         { USB_PROC_PROLOGIC_MODE_SEL, "Mode Select", USB_MIXER_U8, 1 },
1259         { 0 }
1260 };
1261 static struct procunit_value_info threed_enh_proc_info[] = {
1262         { USB_PROC_3DENH_SWITCH, "Switch", USB_MIXER_BOOLEAN },
1263         { USB_PROC_3DENH_SPACE, "Spaciousness", USB_MIXER_U8 },
1264         { 0 }
1265 };
1266 static struct procunit_value_info reverb_proc_info[] = {
1267         { USB_PROC_REVERB_SWITCH, "Switch", USB_MIXER_BOOLEAN },
1268         { USB_PROC_REVERB_LEVEL, "Level", USB_MIXER_U8 },
1269         { USB_PROC_REVERB_TIME, "Time", USB_MIXER_U16 },
1270         { USB_PROC_REVERB_DELAY, "Delay", USB_MIXER_U8 },
1271         { 0 }
1272 };
1273 static struct procunit_value_info chorus_proc_info[] = {
1274         { USB_PROC_CHORUS_SWITCH, "Switch", USB_MIXER_BOOLEAN },
1275         { USB_PROC_CHORUS_LEVEL, "Level", USB_MIXER_U8 },
1276         { USB_PROC_CHORUS_RATE, "Rate", USB_MIXER_U16 },
1277         { USB_PROC_CHORUS_DEPTH, "Depth", USB_MIXER_U16 },
1278         { 0 }
1279 };
1280 static struct procunit_value_info dcr_proc_info[] = {
1281         { USB_PROC_DCR_SWITCH, "Switch", USB_MIXER_BOOLEAN },
1282         { USB_PROC_DCR_RATIO, "Ratio", USB_MIXER_U16 },
1283         { USB_PROC_DCR_MAX_AMP, "Max Amp", USB_MIXER_S16 },
1284         { USB_PROC_DCR_THRESHOLD, "Threshold", USB_MIXER_S16 },
1285         { USB_PROC_DCR_ATTACK, "Attack Time", USB_MIXER_U16 },
1286         { USB_PROC_DCR_RELEASE, "Release Time", USB_MIXER_U16 },
1287         { 0 }
1288 };
1289
1290 static struct procunit_info procunits[] = {
1291         { USB_PROC_UPDOWN, "Up Down", updown_proc_info },
1292         { USB_PROC_PROLOGIC, "Dolby Prologic", prologic_proc_info },
1293         { USB_PROC_3DENH, "3D Stereo Extender", threed_enh_proc_info },
1294         { USB_PROC_REVERB, "Reverb", reverb_proc_info },
1295         { USB_PROC_CHORUS, "Chorus", chorus_proc_info },
1296         { USB_PROC_DCR, "DCR", dcr_proc_info },
1297         { 0 },
1298 };
1299 /*
1300  * predefined data for extension units
1301  */
1302 static struct procunit_value_info clock_rate_xu_info[] = {
1303        { USB_XU_CLOCK_RATE_SELECTOR, "Selector", USB_MIXER_U8, 0 },
1304        { 0 }
1305 };
1306 static struct procunit_value_info clock_source_xu_info[] = {
1307         { USB_XU_CLOCK_SOURCE_SELECTOR, "External", USB_MIXER_BOOLEAN },
1308         { 0 }
1309 };
1310 static struct procunit_value_info spdif_format_xu_info[] = {
1311         { USB_XU_DIGITAL_FORMAT_SELECTOR, "SPDIF/AC3", USB_MIXER_BOOLEAN },
1312         { 0 }
1313 };
1314 static struct procunit_value_info soft_limit_xu_info[] = {
1315         { USB_XU_SOFT_LIMIT_SELECTOR, " ", USB_MIXER_BOOLEAN },
1316         { 0 }
1317 };
1318 static struct procunit_info extunits[] = {
1319         { USB_XU_CLOCK_RATE, "Clock rate", clock_rate_xu_info },
1320         { USB_XU_CLOCK_SOURCE, "DigitalIn CLK source", clock_source_xu_info },
1321         { USB_XU_DIGITAL_IO_STATUS, "DigitalOut format:", spdif_format_xu_info },
1322         { USB_XU_DEVICE_OPTIONS, "AnalogueIn Soft Limit", soft_limit_xu_info },
1323         { 0 }
1324 };
1325 /*
1326  * build a processing/extension unit
1327  */
1328 static int build_audio_procunit(struct mixer_build *state, int unitid, void *raw_desc, struct procunit_info *list, char *name)
1329 {
1330         struct uac_processing_unit_descriptor *desc = raw_desc;
1331         int num_ins = desc->bNrInPins;
1332         struct usb_mixer_elem_info *cval;
1333         struct snd_kcontrol *kctl;
1334         int i, err, nameid, type, len;
1335         struct procunit_info *info;
1336         struct procunit_value_info *valinfo;
1337         const struct usbmix_name_map *map;
1338         static struct procunit_value_info default_value_info[] = {
1339                 { 0x01, "Switch", USB_MIXER_BOOLEAN },
1340                 { 0 }
1341         };
1342         static struct procunit_info default_info = {
1343                 0, NULL, default_value_info
1344         };
1345
1346         if (desc->bLength < 13 || desc->bLength < 13 + num_ins || desc->bLength < num_ins + uac_processing_unit_bControlSize(desc)) {
1347                 snd_printk(KERN_ERR "invalid %s descriptor (id %d)\n", name, unitid);
1348                 return -EINVAL;
1349         }
1350
1351         for (i = 0; i < num_ins; i++) {
1352                 if ((err = parse_audio_unit(state, desc->baSourceID[i])) < 0)
1353                         return err;
1354         }
1355
1356         type = le16_to_cpu(desc->wProcessType);
1357         for (info = list; info && info->type; info++)
1358                 if (info->type == type)
1359                         break;
1360         if (! info || ! info->type)
1361                 info = &default_info;
1362
1363         for (valinfo = info->values; valinfo->control; valinfo++) {
1364                 __u8 *controls = uac_processing_unit_bmControls(desc);
1365
1366                 if (! (controls[valinfo->control / 8] & (1 << ((valinfo->control % 8) - 1))))
1367                         continue;
1368                 map = find_map(state, unitid, valinfo->control);
1369                 if (check_ignored_ctl(map))
1370                         continue;
1371                 cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1372                 if (! cval) {
1373                         snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1374                         return -ENOMEM;
1375                 }
1376                 cval->mixer = state->mixer;
1377                 cval->id = unitid;
1378                 cval->control = valinfo->control;
1379                 cval->val_type = valinfo->val_type;
1380                 cval->channels = 1;
1381
1382                 /* get min/max values */
1383                 if (type == USB_PROC_UPDOWN && cval->control == USB_PROC_UPDOWN_MODE_SEL) {
1384                         __u8 *control_spec = uac_processing_unit_specific(desc);
1385                         /* FIXME: hard-coded */
1386                         cval->min = 1;
1387                         cval->max = control_spec[0];
1388                         cval->res = 1;
1389                         cval->initialized = 1;
1390                 } else {
1391                         if (type == USB_XU_CLOCK_RATE) {
1392                                 /* E-Mu USB 0404/0202/TrackerPre
1393                                  * samplerate control quirk
1394                                  */
1395                                 cval->min = 0;
1396                                 cval->max = 5;
1397                                 cval->res = 1;
1398                                 cval->initialized = 1;
1399                         } else
1400                                 get_min_max(cval, valinfo->min_value);
1401                 }
1402
1403                 kctl = snd_ctl_new1(&mixer_procunit_ctl, cval);
1404                 if (! kctl) {
1405                         snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1406                         kfree(cval);
1407                         return -ENOMEM;
1408                 }
1409                 kctl->private_free = usb_mixer_elem_free;
1410
1411                 if (check_mapped_name(map, kctl->id.name,
1412                                                 sizeof(kctl->id.name)))
1413                         /* nothing */ ;
1414                 else if (info->name)
1415                         strlcpy(kctl->id.name, info->name, sizeof(kctl->id.name));
1416                 else {
1417                         nameid = uac_processing_unit_iProcessing(desc);
1418                         len = 0;
1419                         if (nameid)
1420                                 len = snd_usb_copy_string_desc(state, nameid, kctl->id.name, sizeof(kctl->id.name));
1421                         if (! len)
1422                                 strlcpy(kctl->id.name, name, sizeof(kctl->id.name));
1423                 }
1424                 append_ctl_name(kctl, " ");
1425                 append_ctl_name(kctl, valinfo->suffix);
1426
1427                 snd_printdd(KERN_INFO "[%d] PU [%s] ch = %d, val = %d/%d\n",
1428                             cval->id, kctl->id.name, cval->channels, cval->min, cval->max);
1429                 if ((err = add_control_to_empty(state, kctl)) < 0)
1430                         return err;
1431         }
1432         return 0;
1433 }
1434
1435
1436 static int parse_audio_processing_unit(struct mixer_build *state, int unitid, void *raw_desc)
1437 {
1438         return build_audio_procunit(state, unitid, raw_desc, procunits, "Processing Unit");
1439 }
1440
1441 static int parse_audio_extension_unit(struct mixer_build *state, int unitid, void *raw_desc)
1442 {
1443         /* Note that we parse extension units with processing unit descriptors.
1444          * That's ok as the layout is the same */
1445         return build_audio_procunit(state, unitid, raw_desc, extunits, "Extension Unit");
1446 }
1447
1448
1449 /*
1450  * Selector Unit
1451  */
1452
1453 /* info callback for selector unit
1454  * use an enumerator type for routing
1455  */
1456 static int mixer_ctl_selector_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
1457 {
1458         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1459         char **itemlist = (char **)kcontrol->private_value;
1460
1461         if (snd_BUG_ON(!itemlist))
1462                 return -EINVAL;
1463         uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
1464         uinfo->count = 1;
1465         uinfo->value.enumerated.items = cval->max;
1466         if ((int)uinfo->value.enumerated.item >= cval->max)
1467                 uinfo->value.enumerated.item = cval->max - 1;
1468         strcpy(uinfo->value.enumerated.name, itemlist[uinfo->value.enumerated.item]);
1469         return 0;
1470 }
1471
1472 /* get callback for selector unit */
1473 static int mixer_ctl_selector_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1474 {
1475         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1476         int val, err;
1477
1478         err = get_cur_ctl_value(cval, 0, &val);
1479         if (err < 0) {
1480                 if (cval->mixer->ignore_ctl_error) {
1481                         ucontrol->value.enumerated.item[0] = 0;
1482                         return 0;
1483                 }
1484                 return err;
1485         }
1486         val = get_relative_value(cval, val);
1487         ucontrol->value.enumerated.item[0] = val;
1488         return 0;
1489 }
1490
1491 /* put callback for selector unit */
1492 static int mixer_ctl_selector_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1493 {
1494         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1495         int val, oval, err;
1496
1497         err = get_cur_ctl_value(cval, 0, &oval);
1498         if (err < 0) {
1499                 if (cval->mixer->ignore_ctl_error)
1500                         return 0;
1501                 return err;
1502         }
1503         val = ucontrol->value.enumerated.item[0];
1504         val = get_abs_value(cval, val);
1505         if (val != oval) {
1506                 set_cur_ctl_value(cval, 0, val);
1507                 return 1;
1508         }
1509         return 0;
1510 }
1511
1512 /* alsa control interface for selector unit */
1513 static struct snd_kcontrol_new mixer_selectunit_ctl = {
1514         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1515         .name = "", /* will be filled later */
1516         .info = mixer_ctl_selector_info,
1517         .get = mixer_ctl_selector_get,
1518         .put = mixer_ctl_selector_put,
1519 };
1520
1521
1522 /* private free callback.
1523  * free both private_data and private_value
1524  */
1525 static void usb_mixer_selector_elem_free(struct snd_kcontrol *kctl)
1526 {
1527         int i, num_ins = 0;
1528
1529         if (kctl->private_data) {
1530                 struct usb_mixer_elem_info *cval = kctl->private_data;
1531                 num_ins = cval->max;
1532                 kfree(cval);
1533                 kctl->private_data = NULL;
1534         }
1535         if (kctl->private_value) {
1536                 char **itemlist = (char **)kctl->private_value;
1537                 for (i = 0; i < num_ins; i++)
1538                         kfree(itemlist[i]);
1539                 kfree(itemlist);
1540                 kctl->private_value = 0;
1541         }
1542 }
1543
1544 /*
1545  * parse a selector unit
1546  */
1547 static int parse_audio_selector_unit(struct mixer_build *state, int unitid, void *raw_desc)
1548 {
1549         struct uac_selector_unit_descriptor *desc = raw_desc;
1550         unsigned int i, nameid, len;
1551         int err;
1552         struct usb_mixer_elem_info *cval;
1553         struct snd_kcontrol *kctl;
1554         const struct usbmix_name_map *map;
1555         char **namelist;
1556
1557         if (!desc->bNrInPins || desc->bLength < 5 + desc->bNrInPins) {
1558                 snd_printk(KERN_ERR "invalid SELECTOR UNIT descriptor %d\n", unitid);
1559                 return -EINVAL;
1560         }
1561
1562         for (i = 0; i < desc->bNrInPins; i++) {
1563                 if ((err = parse_audio_unit(state, desc->baSourceID[i])) < 0)
1564                         return err;
1565         }
1566
1567         if (desc->bNrInPins == 1) /* only one ? nonsense! */
1568                 return 0;
1569
1570         map = find_map(state, unitid, 0);
1571         if (check_ignored_ctl(map))
1572                 return 0;
1573
1574         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1575         if (! cval) {
1576                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1577                 return -ENOMEM;
1578         }
1579         cval->mixer = state->mixer;
1580         cval->id = unitid;
1581         cval->val_type = USB_MIXER_U8;
1582         cval->channels = 1;
1583         cval->min = 1;
1584         cval->max = desc->bNrInPins;
1585         cval->res = 1;
1586         cval->initialized = 1;
1587
1588         namelist = kmalloc(sizeof(char *) * desc->bNrInPins, GFP_KERNEL);
1589         if (! namelist) {
1590                 snd_printk(KERN_ERR "cannot malloc\n");
1591                 kfree(cval);
1592                 return -ENOMEM;
1593         }
1594 #define MAX_ITEM_NAME_LEN       64
1595         for (i = 0; i < desc->bNrInPins; i++) {
1596                 struct usb_audio_term iterm;
1597                 len = 0;
1598                 namelist[i] = kmalloc(MAX_ITEM_NAME_LEN, GFP_KERNEL);
1599                 if (! namelist[i]) {
1600                         snd_printk(KERN_ERR "cannot malloc\n");
1601                         while (i--)
1602                                 kfree(namelist[i]);
1603                         kfree(namelist);
1604                         kfree(cval);
1605                         return -ENOMEM;
1606                 }
1607                 len = check_mapped_selector_name(state, unitid, i, namelist[i],
1608                                                  MAX_ITEM_NAME_LEN);
1609                 if (! len && check_input_term(state, desc->baSourceID[i], &iterm) >= 0)
1610                         len = get_term_name(state, &iterm, namelist[i], MAX_ITEM_NAME_LEN, 0);
1611                 if (! len)
1612                         sprintf(namelist[i], "Input %d", i);
1613         }
1614
1615         kctl = snd_ctl_new1(&mixer_selectunit_ctl, cval);
1616         if (! kctl) {
1617                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1618                 kfree(namelist);
1619                 kfree(cval);
1620                 return -ENOMEM;
1621         }
1622         kctl->private_value = (unsigned long)namelist;
1623         kctl->private_free = usb_mixer_selector_elem_free;
1624
1625         nameid = uac_selector_unit_iSelector(desc);
1626         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
1627         if (len)
1628                 ;
1629         else if (nameid)
1630                 snd_usb_copy_string_desc(state, nameid, kctl->id.name, sizeof(kctl->id.name));
1631         else {
1632                 len = get_term_name(state, &state->oterm,
1633                                     kctl->id.name, sizeof(kctl->id.name), 0);
1634                 if (! len)
1635                         strlcpy(kctl->id.name, "USB", sizeof(kctl->id.name));
1636
1637                 if ((state->oterm.type & 0xff00) == 0x0100)
1638                         append_ctl_name(kctl, " Capture Source");
1639                 else
1640                         append_ctl_name(kctl, " Playback Source");
1641         }
1642
1643         snd_printdd(KERN_INFO "[%d] SU [%s] items = %d\n",
1644                     cval->id, kctl->id.name, desc->bNrInPins);
1645         if ((err = add_control_to_empty(state, kctl)) < 0)
1646                 return err;
1647
1648         return 0;
1649 }
1650
1651
1652 /*
1653  * parse an audio unit recursively
1654  */
1655
1656 static int parse_audio_unit(struct mixer_build *state, int unitid)
1657 {
1658         unsigned char *p1;
1659
1660         if (test_and_set_bit(unitid, state->unitbitmap))
1661                 return 0; /* the unit already visited */
1662
1663         p1 = find_audio_control_unit(state, unitid);
1664         if (!p1) {
1665                 snd_printk(KERN_ERR "usbaudio: unit %d not found!\n", unitid);
1666                 return -EINVAL;
1667         }
1668
1669         switch (p1[2]) {
1670         case UAC_INPUT_TERMINAL:
1671                 return 0; /* NOP */
1672         case UAC_MIXER_UNIT:
1673                 return parse_audio_mixer_unit(state, unitid, p1);
1674         case UAC_SELECTOR_UNIT:
1675                 return parse_audio_selector_unit(state, unitid, p1);
1676         case UAC_FEATURE_UNIT:
1677                 return parse_audio_feature_unit(state, unitid, p1);
1678         case UAC_PROCESSING_UNIT_V1:
1679                 return parse_audio_processing_unit(state, unitid, p1);
1680         case UAC_EXTENSION_UNIT_V1:
1681                 return parse_audio_extension_unit(state, unitid, p1);
1682         default:
1683                 snd_printk(KERN_ERR "usbaudio: unit %u: unexpected type 0x%02x\n", unitid, p1[2]);
1684                 return -EINVAL;
1685         }
1686 }
1687
1688 static void snd_usb_mixer_free(struct usb_mixer_interface *mixer)
1689 {
1690         kfree(mixer->id_elems);
1691         if (mixer->urb) {
1692                 kfree(mixer->urb->transfer_buffer);
1693                 usb_free_urb(mixer->urb);
1694         }
1695         usb_free_urb(mixer->rc_urb);
1696         kfree(mixer->rc_setup_packet);
1697         kfree(mixer);
1698 }
1699
1700 static int snd_usb_mixer_dev_free(struct snd_device *device)
1701 {
1702         struct usb_mixer_interface *mixer = device->device_data;
1703         snd_usb_mixer_free(mixer);
1704         return 0;
1705 }
1706
1707 /*
1708  * create mixer controls
1709  *
1710  * walk through all UAC_OUTPUT_TERMINAL descriptors to search for mixers
1711  */
1712 static int snd_usb_mixer_controls(struct usb_mixer_interface *mixer)
1713 {
1714         struct uac_output_terminal_descriptor_v1 *desc;
1715         struct mixer_build state;
1716         int err;
1717         const struct usbmix_ctl_map *map;
1718         struct usb_host_interface *hostif;
1719
1720         hostif = &usb_ifnum_to_if(mixer->chip->dev, mixer->ctrlif)->altsetting[0];
1721         memset(&state, 0, sizeof(state));
1722         state.chip = mixer->chip;
1723         state.mixer = mixer;
1724         state.buffer = hostif->extra;
1725         state.buflen = hostif->extralen;
1726
1727         /* check the mapping table */
1728         for (map = usbmix_ctl_maps; map->id; map++) {
1729                 if (map->id == state.chip->usb_id) {
1730                         state.map = map->map;
1731                         state.selector_map = map->selector_map;
1732                         mixer->ignore_ctl_error = map->ignore_ctl_error;
1733                         break;
1734                 }
1735         }
1736
1737         desc = NULL;
1738         while ((desc = snd_usb_find_csint_desc(hostif->extra, hostif->extralen, desc, UAC_OUTPUT_TERMINAL)) != NULL) {
1739                 if (desc->bLength < 9)
1740                         continue; /* invalid descriptor? */
1741                 set_bit(desc->bTerminalID, state.unitbitmap);  /* mark terminal ID as visited */
1742                 state.oterm.id = desc->bTerminalID;
1743                 state.oterm.type = le16_to_cpu(desc->wTerminalType);
1744                 state.oterm.name = desc->iTerminal;
1745                 err = parse_audio_unit(&state, desc->bSourceID);
1746                 if (err < 0)
1747                         return err;
1748         }
1749         return 0;
1750 }
1751
1752 void snd_usb_mixer_notify_id(struct usb_mixer_interface *mixer, int unitid)
1753 {
1754         struct usb_mixer_elem_info *info;
1755
1756         for (info = mixer->id_elems[unitid]; info; info = info->next_id_elem)
1757                 snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
1758                                info->elem_id);
1759 }
1760
1761 static void snd_usb_mixer_dump_cval(struct snd_info_buffer *buffer,
1762                                     int unitid,
1763                                     struct usb_mixer_elem_info *cval)
1764 {
1765         static char *val_types[] = {"BOOLEAN", "INV_BOOLEAN",
1766                                     "S8", "U8", "S16", "U16"};
1767         snd_iprintf(buffer, "  Unit: %i\n", unitid);
1768         if (cval->elem_id)
1769                 snd_iprintf(buffer, "    Control: name=\"%s\", index=%i\n",
1770                                 cval->elem_id->name, cval->elem_id->index);
1771         snd_iprintf(buffer, "    Info: id=%i, control=%i, cmask=0x%x, "
1772                             "channels=%i, type=\"%s\"\n", cval->id,
1773                             cval->control, cval->cmask, cval->channels,
1774                             val_types[cval->val_type]);
1775         snd_iprintf(buffer, "    Volume: min=%i, max=%i, dBmin=%i, dBmax=%i\n",
1776                             cval->min, cval->max, cval->dBmin, cval->dBmax);
1777 }
1778
1779 static void snd_usb_mixer_proc_read(struct snd_info_entry *entry,
1780                                     struct snd_info_buffer *buffer)
1781 {
1782         struct snd_usb_audio *chip = entry->private_data;
1783         struct usb_mixer_interface *mixer;
1784         struct usb_mixer_elem_info *cval;
1785         int unitid;
1786
1787         list_for_each_entry(mixer, &chip->mixer_list, list) {
1788                 snd_iprintf(buffer,
1789                         "USB Mixer: usb_id=0x%08x, ctrlif=%i, ctlerr=%i\n",
1790                                 chip->usb_id, mixer->ctrlif,
1791                                 mixer->ignore_ctl_error);
1792                 snd_iprintf(buffer, "Card: %s\n", chip->card->longname);
1793                 for (unitid = 0; unitid < MAX_ID_ELEMS; unitid++) {
1794                         for (cval = mixer->id_elems[unitid]; cval;
1795                                                 cval = cval->next_id_elem)
1796                                 snd_usb_mixer_dump_cval(buffer, unitid, cval);
1797                 }
1798         }
1799 }
1800
1801 static void snd_usb_mixer_status_complete(struct urb *urb)
1802 {
1803         struct usb_mixer_interface *mixer = urb->context;
1804
1805         if (urb->status == 0) {
1806                 u8 *buf = urb->transfer_buffer;
1807                 int i;
1808
1809                 for (i = urb->actual_length; i >= 2; buf += 2, i -= 2) {
1810                         snd_printd(KERN_DEBUG "status interrupt: %02x %02x\n",
1811                                    buf[0], buf[1]);
1812                         /* ignore any notifications not from the control interface */
1813                         if ((buf[0] & 0x0f) != 0)
1814                                 continue;
1815                         if (!(buf[0] & 0x40))
1816                                 snd_usb_mixer_notify_id(mixer, buf[1]);
1817                         else
1818                                 snd_usb_mixer_rc_memory_change(mixer, buf[1]);
1819                 }
1820         }
1821         if (urb->status != -ENOENT && urb->status != -ECONNRESET) {
1822                 urb->dev = mixer->chip->dev;
1823                 usb_submit_urb(urb, GFP_ATOMIC);
1824         }
1825 }
1826
1827 /* create the handler for the optional status interrupt endpoint */
1828 static int snd_usb_mixer_status_create(struct usb_mixer_interface *mixer)
1829 {
1830         struct usb_host_interface *hostif;
1831         struct usb_endpoint_descriptor *ep;
1832         void *transfer_buffer;
1833         int buffer_length;
1834         unsigned int epnum;
1835
1836         hostif = &usb_ifnum_to_if(mixer->chip->dev, mixer->ctrlif)->altsetting[0];
1837         /* we need one interrupt input endpoint */
1838         if (get_iface_desc(hostif)->bNumEndpoints < 1)
1839                 return 0;
1840         ep = get_endpoint(hostif, 0);
1841         if (!usb_endpoint_dir_in(ep) || !usb_endpoint_xfer_int(ep))
1842                 return 0;
1843
1844         epnum = usb_endpoint_num(ep);
1845         buffer_length = le16_to_cpu(ep->wMaxPacketSize);
1846         transfer_buffer = kmalloc(buffer_length, GFP_KERNEL);
1847         if (!transfer_buffer)
1848                 return -ENOMEM;
1849         mixer->urb = usb_alloc_urb(0, GFP_KERNEL);
1850         if (!mixer->urb) {
1851                 kfree(transfer_buffer);
1852                 return -ENOMEM;
1853         }
1854         usb_fill_int_urb(mixer->urb, mixer->chip->dev,
1855                          usb_rcvintpipe(mixer->chip->dev, epnum),
1856                          transfer_buffer, buffer_length,
1857                          snd_usb_mixer_status_complete, mixer, ep->bInterval);
1858         usb_submit_urb(mixer->urb, GFP_KERNEL);
1859         return 0;
1860 }
1861
1862 int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif,
1863                          int ignore_error)
1864 {
1865         static struct snd_device_ops dev_ops = {
1866                 .dev_free = snd_usb_mixer_dev_free
1867         };
1868         struct usb_mixer_interface *mixer;
1869         struct snd_info_entry *entry;
1870         struct usb_host_interface *host_iface;
1871         int err, protocol;
1872
1873         strcpy(chip->card->mixername, "USB Mixer");
1874
1875         mixer = kzalloc(sizeof(*mixer), GFP_KERNEL);
1876         if (!mixer)
1877                 return -ENOMEM;
1878         mixer->chip = chip;
1879         mixer->ctrlif = ctrlif;
1880         mixer->ignore_ctl_error = ignore_error;
1881         mixer->id_elems = kcalloc(MAX_ID_ELEMS, sizeof(*mixer->id_elems),
1882                                   GFP_KERNEL);
1883         if (!mixer->id_elems) {
1884                 kfree(mixer);
1885                 return -ENOMEM;
1886         }
1887
1888         host_iface = &usb_ifnum_to_if(chip->dev, ctrlif)->altsetting[0];
1889         protocol = host_iface->desc.bInterfaceProtocol;
1890
1891         /* FIXME! */
1892         if (protocol != UAC_VERSION_1) {
1893                 snd_printk(KERN_WARNING "mixer interface protocol 0x%02x not yet supported\n",
1894                                         protocol);
1895                 return 0;
1896         }
1897
1898         if ((err = snd_usb_mixer_controls(mixer)) < 0 ||
1899             (err = snd_usb_mixer_status_create(mixer)) < 0)
1900                 goto _error;
1901
1902         snd_usb_mixer_apply_create_quirk(mixer);
1903
1904         err = snd_device_new(chip->card, SNDRV_DEV_LOWLEVEL, mixer, &dev_ops);
1905         if (err < 0)
1906                 goto _error;
1907
1908         if (list_empty(&chip->mixer_list) &&
1909             !snd_card_proc_new(chip->card, "usbmixer", &entry))
1910                 snd_info_set_text_ops(entry, chip, snd_usb_mixer_proc_read);
1911
1912         list_add(&mixer->list, &chip->mixer_list);
1913         return 0;
1914
1915 _error:
1916         snd_usb_mixer_free(mixer);
1917         return err;
1918 }
1919
1920 void snd_usb_mixer_disconnect(struct list_head *p)
1921 {
1922         struct usb_mixer_interface *mixer;
1923
1924         mixer = list_entry(p, struct usb_mixer_interface, list);
1925         usb_kill_urb(mixer->urb);
1926         usb_kill_urb(mixer->rc_urb);
1927 }