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 #include <linux/usb/audio-v2.h>
  37
  38 #include <sound/core.h>
  39 #include <sound/control.h>
  40 #include <sound/hwdep.h>
  41 #include <sound/info.h>
  42 #include <sound/tlv.h>
  43
  44 #include "usbaudio.h"
  45 #include "mixer.h"
  46 #include "helper.h"
  47 #include "mixer_quirks.h"
  48
  49 #define MAX_ID_ELEMS    256
  50
  51 struct usb_audio_term {
  52         int id;
  53         int type;
  54         int channels;
  55         unsigned int chconfig;
  56         int name;
  57 };
  58
  59 struct usbmix_name_map;
  60
  61 struct mixer_build {
  62         struct snd_usb_audio *chip;
  63         struct usb_mixer_interface *mixer;
  64         unsigned char *buffer;
  65         unsigned int buflen;
  66         DECLARE_BITMAP(unitbitmap, MAX_ID_ELEMS);
  67         struct usb_audio_term oterm;
  68         const struct usbmix_name_map *map;
  69         const struct usbmix_selector_map *selector_map;
  70 };
  71
  72 enum {
  73         USB_MIXER_BOOLEAN,
  74         USB_MIXER_INV_BOOLEAN,
  75         USB_MIXER_S8,
  76         USB_MIXER_U8,
  77         USB_MIXER_S16,
  78         USB_MIXER_U16,
  79 };
  80
  81
  82 /*E-mu 0202(0404) eXtension Unit(XU) control*/
  83 enum {
  84         USB_XU_CLOCK_RATE               = 0xe301,
  85         USB_XU_CLOCK_SOURCE             = 0xe302,
  86         USB_XU_DIGITAL_IO_STATUS        = 0xe303,
  87         USB_XU_DEVICE_OPTIONS           = 0xe304,
  88         USB_XU_DIRECT_MONITORING        = 0xe305,
  89         USB_XU_METERING                 = 0xe306
  90 };
  91 enum {
  92         USB_XU_CLOCK_SOURCE_SELECTOR = 0x02,    /* clock source*/
  93         USB_XU_CLOCK_RATE_SELECTOR = 0x03,      /* clock rate */
  94         USB_XU_DIGITAL_FORMAT_SELECTOR = 0x01,  /* the spdif format */
  95         USB_XU_SOFT_LIMIT_SELECTOR = 0x03       /* soft limiter */
  96 };
  97
  98 /*
  99  * manual mapping of mixer names
 100  * if the mixer topology is too complicated and the parsed names are
 101  * ambiguous, add the entries in usbmixer_maps.c.
 102  */
 103 #include "mixer_maps.c"
 104
 105 static const struct usbmix_name_map *
 106 find_map(struct mixer_build *state, int unitid, int control)
 107 {
 108         const struct usbmix_name_map *p = state->map;
 109
 110         if (!p)
 111                 return NULL;
 112
 113         for (p = state->map; p->id; p++) {
 114                 if (p->id == unitid &&
 115                     (!control || !p->control || control == p->control))
 116                         return p;
 117         }
 118         return NULL;
 119 }
 120
 121 /* get the mapped name if the unit matches */
 122 static int
 123 check_mapped_name(const struct usbmix_name_map *p, char *buf, int buflen)
 124 {
 125         if (!p || !p->name)
 126                 return 0;
 127
 128         buflen--;
 129         return strlcpy(buf, p->name, buflen);
 130 }
 131
 132 /* check whether the control should be ignored */
 133 static inline int
 134 check_ignored_ctl(const struct usbmix_name_map *p)
 135 {
 136         if (!p || p->name || p->dB)
 137                 return 0;
 138         return 1;
 139 }
 140
 141 /* dB mapping */
 142 static inline void check_mapped_dB(const struct usbmix_name_map *p,
 143                                    struct usb_mixer_elem_info *cval)
 144 {
 145         if (p && p->dB) {
 146                 cval->dBmin = p->dB->min;
 147                 cval->dBmax = p->dB->max;
 148         }
 149 }
 150
 151 /* get the mapped selector source name */
 152 static int check_mapped_selector_name(struct mixer_build *state, int unitid,
 153                                       int index, char *buf, int buflen)
 154 {
 155         const struct usbmix_selector_map *p;
 156
 157         if (! state->selector_map)
 158                 return 0;
 159         for (p = state->selector_map; p->id; p++) {
 160                 if (p->id == unitid && index < p->count)
 161                         return strlcpy(buf, p->names[index], buflen);
 162         }
 163         return 0;
 164 }
 165
 166 /*
 167  * find an audio control unit with the given unit id
 168  * this doesn't return any clock related units, so they need to be handled elsewhere
 169  */
 170 static void *find_audio_control_unit(struct mixer_build *state, unsigned char unit)
 171 {
 172         unsigned char *p;
 173
 174         p = NULL;
 175         while ((p = snd_usb_find_desc(state->buffer, state->buflen, p,
 176                                       USB_DT_CS_INTERFACE)) != NULL) {
 177                 if (p[0] >= 4 && p[2] >= UAC_INPUT_TERMINAL && p[2] <= UAC2_EXTENSION_UNIT_V2 && p[3] == unit)
 178                         return p;
 179         }
 180         return NULL;
 181 }
 182
 183
 184 /*
 185  * copy a string with the given id
 186  */
 187 static int snd_usb_copy_string_desc(struct mixer_build *state, int index, char *buf, int maxlen)
 188 {
 189         int len = usb_string(state->chip->dev, index, buf, maxlen - 1);
 190         buf[len] = 0;
 191         return len;
 192 }
 193
 194 /*
 195  * convert from the byte/word on usb descriptor to the zero-based integer
 196  */
 197 static int convert_signed_value(struct usb_mixer_elem_info *cval, int val)
 198 {
 199         switch (cval->val_type) {
 200         case USB_MIXER_BOOLEAN:
 201                 return !!val;
 202         case USB_MIXER_INV_BOOLEAN:
 203                 return !val;
 204         case USB_MIXER_U8:
 205                 val &= 0xff;
 206                 break;
 207         case USB_MIXER_S8:
 208                 val &= 0xff;
 209                 if (val >= 0x80)
 210                         val -= 0x100;
 211                 break;
 212         case USB_MIXER_U16:
 213                 val &= 0xffff;
 214                 break;
 215         case USB_MIXER_S16:
 216                 val &= 0xffff;
 217                 if (val >= 0x8000)
 218                         val -= 0x10000;
 219                 break;
 220         }
 221         return val;
 222 }
 223
 224 /*
 225  * convert from the zero-based int to the byte/word for usb descriptor
 226  */
 227 static int convert_bytes_value(struct usb_mixer_elem_info *cval, int val)
 228 {
 229         switch (cval->val_type) {
 230         case USB_MIXER_BOOLEAN:
 231                 return !!val;
 232         case USB_MIXER_INV_BOOLEAN:
 233                 return !val;
 234         case USB_MIXER_S8:
 235         case USB_MIXER_U8:
 236                 return val & 0xff;
 237         case USB_MIXER_S16:
 238         case USB_MIXER_U16:
 239                 return val & 0xffff;
 240         }
 241         return 0; /* not reached */
 242 }
 243
 244 static int get_relative_value(struct usb_mixer_elem_info *cval, int val)
 245 {
 246         if (! cval->res)
 247                 cval->res = 1;
 248         if (val < cval->min)
 249                 return 0;
 250         else if (val >= cval->max)
 251                 return (cval->max - cval->min + cval->res - 1) / cval->res;
 252         else
 253                 return (val - cval->min) / cval->res;
 254 }
 255
 256 static int get_abs_value(struct usb_mixer_elem_info *cval, int val)
 257 {
 258         if (val < 0)
 259                 return cval->min;
 260         if (! cval->res)
 261                 cval->res = 1;
 262         val *= cval->res;
 263         val += cval->min;
 264         if (val > cval->max)
 265                 return cval->max;
 266         return val;
 267 }
 268
 269
 270 /*
 271  * retrieve a mixer value
 272  */
 273
 274 static int get_ctl_value_v1(struct usb_mixer_elem_info *cval, int request, int validx, int *value_ret)
 275 {
 276         unsigned char buf[2];
 277         int val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
 278         int timeout = 10;
 279
 280         while (timeout-- > 0) {
 281                 if (snd_usb_ctl_msg(cval->mixer->chip->dev,
 282                                     usb_rcvctrlpipe(cval->mixer->chip->dev, 0),
 283                                     request,
 284                                     USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
 285                                     validx, cval->mixer->ctrlif | (cval->id << 8),
 286                                     buf, val_len, 100) >= val_len) {
 287                         *value_ret = convert_signed_value(cval, snd_usb_combine_bytes(buf, val_len));
 288                         return 0;
 289                 }
 290         }
 291         snd_printdd(KERN_ERR "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
 292                     request, validx, cval->mixer->ctrlif | (cval->id << 8), cval->val_type);
 293         return -EINVAL;
 294 }
 295
 296 static int get_ctl_value_v2(struct usb_mixer_elem_info *cval, int request, int validx, int *value_ret)
 297 {
 298         unsigned char buf[14]; /* enough space for one range of 4 bytes */
 299         unsigned char *val;
 300         int ret;
 301         __u8 bRequest;
 302
 303         bRequest = (request == UAC_GET_CUR) ?
 304                 UAC2_CS_CUR : UAC2_CS_RANGE;
 305
 306         ret = snd_usb_ctl_msg(cval->mixer->chip->dev,
 307                               usb_rcvctrlpipe(cval->mixer->chip->dev, 0),
 308                               bRequest,
 309                               USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
 310                               validx, cval->mixer->ctrlif | (cval->id << 8),
 311                               buf, sizeof(buf), 1000);
 312
 313         if (ret < 0) {
 314                 snd_printdd(KERN_ERR "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
 315                             request, validx, cval->mixer->ctrlif | (cval->id << 8), cval->val_type);
 316                 return ret;
 317         }
 318
 319         switch (request) {
 320         case UAC_GET_CUR:
 321                 val = buf;
 322                 break;
 323         case UAC_GET_MIN:
 324                 val = buf + sizeof(__u16);
 325                 break;
 326         case UAC_GET_MAX:
 327                 val = buf + sizeof(__u16) * 2;
 328                 break;
 329         case UAC_GET_RES:
 330                 val = buf + sizeof(__u16) * 3;
 331                 break;
 332         default:
 333                 return -EINVAL;
 334         }
 335
 336         *value_ret = convert_signed_value(cval, snd_usb_combine_bytes(val, sizeof(__u16)));
 337
 338         return 0;
 339 }
 340
 341 static int get_ctl_value(struct usb_mixer_elem_info *cval, int request, int validx, int *value_ret)
 342 {
 343         return (cval->mixer->protocol == UAC_VERSION_1) ?
 344                 get_ctl_value_v1(cval, request, validx, value_ret) :
 345                 get_ctl_value_v2(cval, request, validx, value_ret);
 346 }
 347
 348 static int get_cur_ctl_value(struct usb_mixer_elem_info *cval, int validx, int *value)
 349 {
 350         return get_ctl_value(cval, UAC_GET_CUR, validx, value);
 351 }
 352
 353 /* channel = 0: master, 1 = first channel */
 354 static inline int get_cur_mix_raw(struct usb_mixer_elem_info *cval,
 355                                   int channel, int *value)
 356 {
 357         return get_ctl_value(cval, UAC_GET_CUR, (cval->control << 8) | channel, value);
 358 }
 359
 360 static int get_cur_mix_value(struct usb_mixer_elem_info *cval,
 361                              int channel, int index, int *value)
 362 {
 363         int err;
 364
 365         if (cval->cached & (1 << channel)) {
 366                 *value = cval->cache_val[index];
 367                 return 0;
 368         }
 369         err = get_cur_mix_raw(cval, channel, value);
 370         if (err < 0) {
 371                 if (!cval->mixer->ignore_ctl_error)
 372                         snd_printd(KERN_ERR "cannot get current value for control %d ch %d: err = %d\n",
 373                                    cval->control, channel, err);
 374                 return err;
 375         }
 376         cval->cached |= 1 << channel;
 377         cval->cache_val[index] = *value;
 378         return 0;
 379 }
 380
 381
 382 /*
 383  * set a mixer value
 384  */
 385
 386 int snd_usb_mixer_set_ctl_value(struct usb_mixer_elem_info *cval,
 387                                 int request, int validx, int value_set)
 388 {
 389         unsigned char buf[2];
 390         int val_len, timeout = 10;
 391
 392         if (cval->mixer->protocol == UAC_VERSION_1) {
 393                 val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
 394         } else { /* UAC_VERSION_2 */
 395                 /* audio class v2 controls are always 2 bytes in size */
 396                 val_len = sizeof(__u16);
 397
 398                 /* FIXME */
 399                 if (request != UAC_SET_CUR) {
 400                         snd_printdd(KERN_WARNING "RANGE setting not yet supported\n");
 401                         return -EINVAL;
 402                 }
 403
 404                 request = UAC2_CS_CUR;
 405         }
 406
 407         value_set = convert_bytes_value(cval, value_set);
 408         buf[0] = value_set & 0xff;
 409         buf[1] = (value_set >> 8) & 0xff;
 410         while (timeout-- > 0)
 411                 if (snd_usb_ctl_msg(cval->mixer->chip->dev,
 412                                     usb_sndctrlpipe(cval->mixer->chip->dev, 0),
 413                                     request,
 414                                     USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
 415                                     validx, cval->mixer->ctrlif | (cval->id << 8),
 416                                     buf, val_len, 100) >= 0)
 417                         return 0;
 418         snd_printdd(KERN_ERR "cannot set ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d, data = %#x/%#x\n",
 419                     request, validx, cval->mixer->ctrlif | (cval->id << 8), cval->val_type, buf[0], buf[1]);
 420         return -EINVAL;
 421 }
 422
 423 static int set_cur_ctl_value(struct usb_mixer_elem_info *cval, int validx, int value)
 424 {
 425         return snd_usb_mixer_set_ctl_value(cval, UAC_SET_CUR, validx, value);
 426 }
 427
 428 static int set_cur_mix_value(struct usb_mixer_elem_info *cval, int channel,
 429                              int index, int value)
 430 {
 431         int err;
 432         unsigned int read_only = (channel == 0) ?
 433                 cval->master_readonly :
 434                 cval->ch_readonly & (1 << (channel - 1));
 435
 436         if (read_only) {
 437                 snd_printdd(KERN_INFO "%s(): channel %d of control %d is read_only\n",
 438                             __func__, channel, cval->control);
 439                 return 0;
 440         }
 441
 442         err = snd_usb_mixer_set_ctl_value(cval, UAC_SET_CUR, (cval->control << 8) | channel,
 443                             value);
 444         if (err < 0)
 445                 return err;
 446         cval->cached |= 1 << channel;
 447         cval->cache_val[index] = value;
 448         return 0;
 449 }
 450
 451 /*
 452  * TLV callback for mixer volume controls
 453  */
 454 static int mixer_vol_tlv(struct snd_kcontrol *kcontrol, int op_flag,
 455                          unsigned int size, unsigned int __user *_tlv)
 456 {
 457         struct usb_mixer_elem_info *cval = kcontrol->private_data;
 458         DECLARE_TLV_DB_MINMAX(scale, 0, 0);
 459
 460         if (size < sizeof(scale))
 461                 return -ENOMEM;
 462         scale[2] = cval->dBmin;
 463         scale[3] = cval->dBmax;
 464         if (copy_to_user(_tlv, scale, sizeof(scale)))
 465                 return -EFAULT;
 466         return 0;
 467 }
 468
 469 /*
 470  * parser routines begin here...
 471  */
 472
 473 static int parse_audio_unit(struct mixer_build *state, int unitid);
 474
 475
 476 /*
 477  * check if the input/output channel routing is enabled on the given bitmap.
 478  * used for mixer unit parser
 479  */
 480 static int check_matrix_bitmap(unsigned char *bmap, int ich, int och, int num_outs)
 481 {
 482         int idx = ich * num_outs + och;
 483         return bmap[idx >> 3] & (0x80 >> (idx & 7));
 484 }
 485
 486
 487 /*
 488  * add an alsa control element
 489  * search and increment the index until an empty slot is found.
 490  *
 491  * if failed, give up and free the control instance.
 492  */
 493
 494 static int add_control_to_empty(struct mixer_build *state, struct snd_kcontrol *kctl)
 495 {
 496         struct usb_mixer_elem_info *cval = kctl->private_data;
 497         int err;
 498
 499         while (snd_ctl_find_id(state->chip->card, &kctl->id))
 500                 kctl->id.index++;
 501         if ((err = snd_ctl_add(state->chip->card, kctl)) < 0) {
 502                 snd_printd(KERN_ERR "cannot add control (err = %d)\n", err);
 503                 return err;
 504         }
 505         cval->elem_id = &kctl->id;
 506         cval->next_id_elem = state->mixer->id_elems[cval->id];
 507         state->mixer->id_elems[cval->id] = cval;
 508         return 0;
 509 }
 510
 511
 512 /*
 513  * get a terminal name string
 514  */
 515
 516 static struct iterm_name_combo {
 517         int type;
 518         char *name;
 519 } iterm_names[] = {
 520         { 0x0300, "Output" },
 521         { 0x0301, "Speaker" },
 522         { 0x0302, "Headphone" },
 523         { 0x0303, "HMD Audio" },
 524         { 0x0304, "Desktop Speaker" },
 525         { 0x0305, "Room Speaker" },
 526         { 0x0306, "Com Speaker" },
 527         { 0x0307, "LFE" },
 528         { 0x0600, "External In" },
 529         { 0x0601, "Analog In" },
 530         { 0x0602, "Digital In" },
 531         { 0x0603, "Line" },
 532         { 0x0604, "Legacy In" },
 533         { 0x0605, "IEC958 In" },
 534         { 0x0606, "1394 DA Stream" },
 535         { 0x0607, "1394 DV Stream" },
 536         { 0x0700, "Embedded" },
 537         { 0x0701, "Noise Source" },
 538         { 0x0702, "Equalization Noise" },
 539         { 0x0703, "CD" },
 540         { 0x0704, "DAT" },
 541         { 0x0705, "DCC" },
 542         { 0x0706, "MiniDisk" },
 543         { 0x0707, "Analog Tape" },
 544         { 0x0708, "Phonograph" },
 545         { 0x0709, "VCR Audio" },
 546         { 0x070a, "Video Disk Audio" },
 547         { 0x070b, "DVD Audio" },
 548         { 0x070c, "TV Tuner Audio" },
 549         { 0x070d, "Satellite Rec Audio" },
 550         { 0x070e, "Cable Tuner Audio" },
 551         { 0x070f, "DSS Audio" },
 552         { 0x0710, "Radio Receiver" },
 553         { 0x0711, "Radio Transmitter" },
 554         { 0x0712, "Multi-Track Recorder" },
 555         { 0x0713, "Synthesizer" },
 556         { 0 },
 557 };
 558
 559 static int get_term_name(struct mixer_build *state, struct usb_audio_term *iterm,
 560                          unsigned char *name, int maxlen, int term_only)
 561 {
 562         struct iterm_name_combo *names;
 563
 564         if (iterm->name)
 565                 return snd_usb_copy_string_desc(state, iterm->name, name, maxlen);
 566
 567         /* virtual type - not a real terminal */
 568         if (iterm->type >> 16) {
 569                 if (term_only)
 570                         return 0;
 571                 switch (iterm->type >> 16) {
 572                 case UAC_SELECTOR_UNIT:
 573                         strcpy(name, "Selector"); return 8;
 574                 case UAC_PROCESSING_UNIT_V1:
 575                         strcpy(name, "Process Unit"); return 12;
 576                 case UAC_EXTENSION_UNIT_V1:
 577                         strcpy(name, "Ext Unit"); return 8;
 578                 case UAC_MIXER_UNIT:
 579                         strcpy(name, "Mixer"); return 5;
 580                 default:
 581                         return sprintf(name, "Unit %d", iterm->id);
 582                 }
 583         }
 584
 585         switch (iterm->type & 0xff00) {
 586         case 0x0100:
 587                 strcpy(name, "PCM"); return 3;
 588         case 0x0200:
 589                 strcpy(name, "Mic"); return 3;
 590         case 0x0400:
 591                 strcpy(name, "Headset"); return 7;
 592         case 0x0500:
 593                 strcpy(name, "Phone"); return 5;
 594         }
 595
 596         for (names = iterm_names; names->type; names++)
 597                 if (names->type == iterm->type) {
 598                         strcpy(name, names->name);
 599                         return strlen(names->name);
 600                 }
 601         return 0;
 602 }
 603
 604
 605 /*
 606  * parse the source unit recursively until it reaches to a terminal
 607  * or a branched unit.
 608  */
 609 static int check_input_term(struct mixer_build *state, int id, struct usb_audio_term *term)
 610 {
 611         void *p1;
 612
 613         memset(term, 0, sizeof(*term));
 614         while ((p1 = find_audio_control_unit(state, id)) != NULL) {
 615                 unsigned char *hdr = p1;
 616                 term->id = id;
 617                 switch (hdr[2]) {
 618                 case UAC_INPUT_TERMINAL:
 619                         if (state->mixer->protocol == UAC_VERSION_1) {
 620                                 struct uac_input_terminal_descriptor *d = p1;
 621                                 term->type = le16_to_cpu(d->wTerminalType);
 622                                 term->channels = d->bNrChannels;
 623                                 term->chconfig = le16_to_cpu(d->wChannelConfig);
 624                                 term->name = d->iTerminal;
 625                         } else { /* UAC_VERSION_2 */
 626                                 struct uac2_input_terminal_descriptor *d = p1;
 627                                 term->type = le16_to_cpu(d->wTerminalType);
 628                                 term->channels = d->bNrChannels;
 629                                 term->chconfig = le32_to_cpu(d->bmChannelConfig);
 630                                 term->name = d->iTerminal;
 631                         }
 632                         return 0;
 633                 case UAC_FEATURE_UNIT: {
 634                         /* the header is the same for v1 and v2 */
 635                         struct uac_feature_unit_descriptor *d = p1;
 636                         id = d->bSourceID;
 637                         break; /* continue to parse */
 638                 }
 639                 case UAC_MIXER_UNIT: {
 640                         struct uac_mixer_unit_descriptor *d = p1;
 641                         term->type = d->bDescriptorSubtype << 16; /* virtual type */
 642                         term->channels = uac_mixer_unit_bNrChannels(d);
 643                         term->chconfig = uac_mixer_unit_wChannelConfig(d, state->mixer->protocol);
 644                         term->name = uac_mixer_unit_iMixer(d);
 645                         return 0;
 646                 }
 647                 case UAC_SELECTOR_UNIT: {
 648                         struct uac_selector_unit_descriptor *d = p1;
 649                         /* call recursively to retrieve the channel info */
 650                         if (check_input_term(state, d->baSourceID[0], term) < 0)
 651                                 return -ENODEV;
 652                         term->type = d->bDescriptorSubtype << 16; /* virtual type */
 653                         term->id = id;
 654                         term->name = uac_selector_unit_iSelector(d);
 655                         return 0;
 656                 }
 657                 case UAC_PROCESSING_UNIT_V1:
 658                 case UAC_EXTENSION_UNIT_V1: {
 659                         struct uac_processing_unit_descriptor *d = p1;
 660                         if (d->bNrInPins) {
 661                                 id = d->baSourceID[0];
 662                                 break; /* continue to parse */
 663                         }
 664                         term->type = d->bDescriptorSubtype << 16; /* virtual type */
 665                         term->channels = uac_processing_unit_bNrChannels(d);
 666                         term->chconfig = uac_processing_unit_wChannelConfig(d, state->mixer->protocol);
 667                         term->name = uac_processing_unit_iProcessing(d, state->mixer->protocol);
 668                         return 0;
 669                 }
 670                 default:
 671                         return -ENODEV;
 672                 }
 673         }
 674         return -ENODEV;
 675 }
 676
 677
 678 /*
 679  * Feature Unit
 680  */
 681
 682 /* feature unit control information */
 683 struct usb_feature_control_info {
 684         const char *name;
 685         unsigned int type;      /* control type (mute, volume, etc.) */
 686 };
 687
 688 static struct usb_feature_control_info audio_feature_info[] = {
 689         { "Mute",               USB_MIXER_INV_BOOLEAN },
 690         { "Volume",             USB_MIXER_S16 },
 691         { "Tone Control - Bass",        USB_MIXER_S8 },
 692         { "Tone Control - Mid",         USB_MIXER_S8 },
 693         { "Tone Control - Treble",      USB_MIXER_S8 },
 694         { "Graphic Equalizer",          USB_MIXER_S8 }, /* FIXME: not implemeted yet */
 695         { "Auto Gain Control",  USB_MIXER_BOOLEAN },
 696         { "Delay Control",      USB_MIXER_U16 },
 697         { "Bass Boost",         USB_MIXER_BOOLEAN },
 698         { "Loudness",           USB_MIXER_BOOLEAN },
 699 };
 700
 701
 702 /* private_free callback */
 703 static void usb_mixer_elem_free(struct snd_kcontrol *kctl)
 704 {
 705         kfree(kctl->private_data);
 706         kctl->private_data = NULL;
 707 }
 708
 709
 710 /*
 711  * interface to ALSA control for feature/mixer units
 712  */
 713
 714 /*
 715  * retrieve the minimum and maximum values for the specified control
 716  */
 717 static int get_min_max(struct usb_mixer_elem_info *cval, int default_min)
 718 {
 719         /* for failsafe */
 720         cval->min = default_min;
 721         cval->max = cval->min + 1;
 722         cval->res = 1;
 723         cval->dBmin = cval->dBmax = 0;
 724
 725         if (cval->val_type == USB_MIXER_BOOLEAN ||
 726             cval->val_type == USB_MIXER_INV_BOOLEAN) {
 727                 cval->initialized = 1;
 728         } else {
 729                 int minchn = 0;
 730                 if (cval->cmask) {
 731                         int i;
 732                         for (i = 0; i < MAX_CHANNELS; i++)
 733                                 if (cval->cmask & (1 << i)) {
 734                                         minchn = i + 1;
 735                                         break;
 736                                 }
 737                 }
 738                 if (get_ctl_value(cval, UAC_GET_MAX, (cval->control << 8) | minchn, &cval->max) < 0 ||
 739                     get_ctl_value(cval, UAC_GET_MIN, (cval->control << 8) | minchn, &cval->min) < 0) {
 740                         snd_printd(KERN_ERR "%d:%d: cannot get min/max values for control %d (id %d)\n",
 741                                    cval->id, cval->mixer->ctrlif, cval->control, cval->id);
 742                         return -EINVAL;
 743                 }
 744                 if (get_ctl_value(cval, UAC_GET_RES, (cval->control << 8) | minchn, &cval->res) < 0) {
 745                         cval->res = 1;
 746                 } else {
 747                         int last_valid_res = cval->res;
 748
 749                         while (cval->res > 1) {
 750                                 if (snd_usb_mixer_set_ctl_value(cval, UAC_SET_RES,
 751                                                                 (cval->control << 8) | minchn, cval->res / 2) < 0)
 752                                         break;
 753                                 cval->res /= 2;
 754                         }
 755                         if (get_ctl_value(cval, UAC_GET_RES, (cval->control << 8) | minchn, &cval->res) < 0)
 756                                 cval->res = last_valid_res;
 757                 }
 758                 if (cval->res == 0)
 759                         cval->res = 1;
 760
 761                 /* Additional checks for the proper resolution
 762                  *
 763                  * Some devices report smaller resolutions than actually
 764                  * reacting.  They don't return errors but simply clip
 765                  * to the lower aligned value.
 766                  */
 767                 if (cval->min + cval->res < cval->max) {
 768                         int last_valid_res = cval->res;
 769                         int saved, test, check;
 770                         get_cur_mix_raw(cval, minchn, &saved);
 771                         for (;;) {
 772                                 test = saved;
 773                                 if (test < cval->max)
 774                                         test += cval->res;
 775                                 else
 776                                         test -= cval->res;
 777                                 if (test < cval->min || test > cval->max ||
 778                                     set_cur_mix_value(cval, minchn, 0, test) ||
 779                                     get_cur_mix_raw(cval, minchn, &check)) {
 780                                         cval->res = last_valid_res;
 781                                         break;
 782                                 }
 783                                 if (test == check)
 784                                         break;
 785                                 cval->res *= 2;
 786                         }
 787                         set_cur_mix_value(cval, minchn, 0, saved);
 788                 }
 789
 790                 cval->initialized = 1;
 791         }
 792
 793         /* USB descriptions contain the dB scale in 1/256 dB unit
 794          * while ALSA TLV contains in 1/100 dB unit
 795          */
 796         cval->dBmin = (convert_signed_value(cval, cval->min) * 100) / 256;
 797         cval->dBmax = (convert_signed_value(cval, cval->max) * 100) / 256;
 798         if (cval->dBmin > cval->dBmax) {
 799                 /* something is wrong; assume it's either from/to 0dB */
 800                 if (cval->dBmin < 0)
 801                         cval->dBmax = 0;
 802                 else if (cval->dBmin > 0)
 803                         cval->dBmin = 0;
 804                 if (cval->dBmin > cval->dBmax) {
 805                         /* totally crap, return an error */
 806                         return -EINVAL;
 807                 }
 808         }
 809
 810         return 0;
 811 }
 812
 813
 814 /* get a feature/mixer unit info */
 815 static int mixer_ctl_feature_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
 816 {
 817         struct usb_mixer_elem_info *cval = kcontrol->private_data;
 818
 819         if (cval->val_type == USB_MIXER_BOOLEAN ||
 820             cval->val_type == USB_MIXER_INV_BOOLEAN)
 821                 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
 822         else
 823                 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 824         uinfo->count = cval->channels;
 825         if (cval->val_type == USB_MIXER_BOOLEAN ||
 826             cval->val_type == USB_MIXER_INV_BOOLEAN) {
 827                 uinfo->value.integer.min = 0;
 828                 uinfo->value.integer.max = 1;
 829         } else {
 830                 if (! cval->initialized)
 831                         get_min_max(cval,  0);
 832                 uinfo->value.integer.min = 0;
 833                 uinfo->value.integer.max =
 834                         (cval->max - cval->min + cval->res - 1) / cval->res;
 835         }
 836         return 0;
 837 }
 838
 839 /* get the current value from feature/mixer unit */
 840 static int mixer_ctl_feature_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
 841 {
 842         struct usb_mixer_elem_info *cval = kcontrol->private_data;
 843         int c, cnt, val, err;
 844
 845         ucontrol->value.integer.value[0] = cval->min;
 846         if (cval->cmask) {
 847                 cnt = 0;
 848                 for (c = 0; c < MAX_CHANNELS; c++) {
 849                         if (!(cval->cmask & (1 << c)))
 850                                 continue;
 851                         err = get_cur_mix_value(cval, c + 1, cnt, &val);
 852                         if (err < 0)
 853                                 return cval->mixer->ignore_ctl_error ? 0 : err;
 854                         val = get_relative_value(cval, val);
 855                         ucontrol->value.integer.value[cnt] = val;
 856                         cnt++;
 857                 }
 858                 return 0;
 859         } else {
 860                 /* master channel */
 861                 err = get_cur_mix_value(cval, 0, 0, &val);
 862                 if (err < 0)
 863                         return cval->mixer->ignore_ctl_error ? 0 : err;
 864                 val = get_relative_value(cval, val);
 865                 ucontrol->value.integer.value[0] = val;
 866         }
 867         return 0;
 868 }
 869
 870 /* put the current value to feature/mixer unit */
 871 static int mixer_ctl_feature_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
 872 {
 873         struct usb_mixer_elem_info *cval = kcontrol->private_data;
 874         int c, cnt, val, oval, err;
 875         int changed = 0;
 876
 877         if (cval->cmask) {
 878                 cnt = 0;
 879                 for (c = 0; c < MAX_CHANNELS; c++) {
 880                         if (!(cval->cmask & (1 << c)))
 881                                 continue;
 882                         err = get_cur_mix_value(cval, c + 1, cnt, &oval);
 883                         if (err < 0)
 884                                 return cval->mixer->ignore_ctl_error ? 0 : err;
 885                         val = ucontrol->value.integer.value[cnt];
 886                         val = get_abs_value(cval, val);
 887                         if (oval != val) {
 888                                 set_cur_mix_value(cval, c + 1, cnt, val);
 889                                 changed = 1;
 890                         }
 891                         cnt++;
 892                 }
 893         } else {
 894                 /* master channel */
 895                 err = get_cur_mix_value(cval, 0, 0, &oval);
 896                 if (err < 0)
 897                         return cval->mixer->ignore_ctl_error ? 0 : err;
 898                 val = ucontrol->value.integer.value[0];
 899                 val = get_abs_value(cval, val);
 900                 if (val != oval) {
 901                         set_cur_mix_value(cval, 0, 0, val);
 902                         changed = 1;
 903                 }
 904         }
 905         return changed;
 906 }
 907
 908 static struct snd_kcontrol_new usb_feature_unit_ctl = {
 909         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 910         .name = "", /* will be filled later manually */
 911         .info = mixer_ctl_feature_info,
 912         .get = mixer_ctl_feature_get,
 913         .put = mixer_ctl_feature_put,
 914 };
 915
 916 /* the read-only variant */
 917 static struct snd_kcontrol_new usb_feature_unit_ctl_ro = {
 918         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 919         .name = "", /* will be filled later manually */
 920         .info = mixer_ctl_feature_info,
 921         .get = mixer_ctl_feature_get,
 922         .put = NULL,
 923 };
 924
 925
 926 /*
 927  * build a feature control
 928  */
 929
 930 static size_t append_ctl_name(struct snd_kcontrol *kctl, const char *str)
 931 {
 932         return strlcat(kctl->id.name, str, sizeof(kctl->id.name));
 933 }
 934
 935 static void build_feature_ctl(struct mixer_build *state, void *raw_desc,
 936                               unsigned int ctl_mask, int control,
 937                               struct usb_audio_term *iterm, int unitid,
 938                               int readonly_mask)
 939 {
 940         struct uac_feature_unit_descriptor *desc = raw_desc;
 941         unsigned int len = 0;
 942         int mapped_name = 0;
 943         int nameid = uac_feature_unit_iFeature(desc);
 944         struct snd_kcontrol *kctl;
 945         struct usb_mixer_elem_info *cval;
 946         const struct usbmix_name_map *map;
 947
 948         control++; /* change from zero-based to 1-based value */
 949
 950         if (control == UAC_FU_GRAPHIC_EQUALIZER) {
 951                 /* FIXME: not supported yet */
 952                 return;
 953         }
 954
 955         map = find_map(state, unitid, control);
 956         if (check_ignored_ctl(map))
 957                 return;
 958
 959         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
 960         if (! cval) {
 961                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
 962                 return;
 963         }
 964         cval->mixer = state->mixer;
 965         cval->id = unitid;
 966         cval->control = control;
 967         cval->cmask = ctl_mask;
 968         cval->val_type = audio_feature_info[control-1].type;
 969         if (ctl_mask == 0) {
 970                 cval->channels = 1;     /* master channel */
 971                 cval->master_readonly = readonly_mask;
 972         } else {
 973                 int i, c = 0;
 974                 for (i = 0; i < 16; i++)
 975                         if (ctl_mask & (1 << i))
 976                                 c++;
 977                 cval->channels = c;
 978                 cval->ch_readonly = readonly_mask;
 979         }
 980
 981         /* get min/max values */
 982         get_min_max(cval, 0);
 983
 984         /* if all channels in the mask are marked read-only, make the control
 985          * read-only. set_cur_mix_value() will check the mask again and won't
 986          * issue write commands to read-only channels. */
 987         if (cval->channels == readonly_mask)
 988                 kctl = snd_ctl_new1(&usb_feature_unit_ctl_ro, cval);
 989         else
 990                 kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
 991
 992         if (! kctl) {
 993                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
 994                 kfree(cval);
 995                 return;
 996         }
 997         kctl->private_free = usb_mixer_elem_free;
 998
 999         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
1000         mapped_name = len != 0;
1001         if (! len && nameid)
1002                 len = snd_usb_copy_string_desc(state, nameid,
1003                                 kctl->id.name, sizeof(kctl->id.name));
1004
1005         switch (control) {
1006         case UAC_FU_MUTE:
1007         case UAC_FU_VOLUME:
1008                 /* determine the control name.  the rule is:
1009                  * - if a name id is given in descriptor, use it.
1010                  * - if the connected input can be determined, then use the name
1011                  *   of terminal type.
1012                  * - if the connected output can be determined, use it.
1013                  * - otherwise, anonymous name.
1014                  */
1015                 if (! len) {
1016                         len = get_term_name(state, iterm, kctl->id.name, sizeof(kctl->id.name), 1);
1017                         if (! len)
1018                                 len = get_term_name(state, &state->oterm, kctl->id.name, sizeof(kctl->id.name), 1);
1019                         if (! len)
1020                                 len = snprintf(kctl->id.name, sizeof(kctl->id.name),
1021                                                "Feature %d", unitid);
1022                 }
1023                 /* determine the stream direction:
1024                  * if the connected output is USB stream, then it's likely a
1025                  * capture stream.  otherwise it should be playback (hopefully :)
1026                  */
1027                 if (! mapped_name && ! (state->oterm.type >> 16)) {
1028                         if ((state->oterm.type & 0xff00) == 0x0100) {
1029                                 len = append_ctl_name(kctl, " Capture");
1030                         } else {
1031                                 len = append_ctl_name(kctl, " Playback");
1032                         }
1033                 }
1034                 append_ctl_name(kctl, control == UAC_FU_MUTE ?
1035                                 " Switch" : " Volume");
1036                 if (control == UAC_FU_VOLUME) {
1037                         kctl->tlv.c = mixer_vol_tlv;
1038                         kctl->vd[0].access |=
1039                                 SNDRV_CTL_ELEM_ACCESS_TLV_READ |
1040                                 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
1041                         check_mapped_dB(map, cval);
1042                 }
1043                 break;
1044
1045         default:
1046                 if (! len)
1047                         strlcpy(kctl->id.name, audio_feature_info[control-1].name,
1048                                 sizeof(kctl->id.name));
1049                 break;
1050         }
1051
1052         /* volume control quirks */
1053         switch (state->chip->usb_id) {
1054         case USB_ID(0x0471, 0x0101):
1055         case USB_ID(0x0471, 0x0104):
1056         case USB_ID(0x0471, 0x0105):
1057         case USB_ID(0x0672, 0x1041):
1058         /* quirk for UDA1321/N101.
1059          * note that detection between firmware 2.1.1.7 (N101)
1060          * and later 2.1.1.21 is not very clear from datasheets.
1061          * I hope that the min value is -15360 for newer firmware --jk
1062          */
1063                 if (!strcmp(kctl->id.name, "PCM Playback Volume") &&
1064                     cval->min == -15616) {
1065                         snd_printk(KERN_INFO
1066                                  "set volume quirk for UDA1321/N101 chip\n");
1067                         cval->max = -256;
1068                 }
1069                 break;
1070
1071         case USB_ID(0x046d, 0x09a4):
1072                 if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
1073                         snd_printk(KERN_INFO
1074                                 "set volume quirk for QuickCam E3500\n");
1075                         cval->min = 6080;
1076                         cval->max = 8768;
1077                         cval->res = 192;
1078                 }
1079                 break;
1080
1081         }
1082
1083         snd_printdd(KERN_INFO "[%d] FU [%s] ch = %d, val = %d/%d/%d\n",
1084                     cval->id, kctl->id.name, cval->channels, cval->min, cval->max, cval->res);
1085         add_control_to_empty(state, kctl);
1086 }
1087
1088
1089
1090 /*
1091  * parse a feature unit
1092  *
1093  * most of controlls are defined here.
1094  */
1095 static int parse_audio_feature_unit(struct mixer_build *state, int unitid, void *_ftr)
1096 {
1097         int channels, i, j;
1098         struct usb_audio_term iterm;
1099         unsigned int master_bits, first_ch_bits;
1100         int err, csize;
1101         struct uac_feature_unit_descriptor *hdr = _ftr;
1102         __u8 *bmaControls;
1103
1104         if (state->mixer->protocol == UAC_VERSION_1) {
1105                 csize = hdr->bControlSize;
1106                 channels = (hdr->bLength - 7) / csize - 1;
1107                 bmaControls = hdr->bmaControls;
1108         } else {
1109                 struct uac2_feature_unit_descriptor *ftr = _ftr;
1110                 csize = 4;
1111                 channels = (hdr->bLength - 6) / 4 - 1;
1112                 bmaControls = ftr->bmaControls;
1113         }
1114
1115         if (hdr->bLength < 7 || !csize || hdr->bLength < 7 + csize) {
1116                 snd_printk(KERN_ERR "usbaudio: unit %u: invalid UAC_FEATURE_UNIT descriptor\n", unitid);
1117                 return -EINVAL;
1118         }
1119
1120         /* parse the source unit */
1121         if ((err = parse_audio_unit(state, hdr->bSourceID)) < 0)
1122                 return err;
1123
1124         /* determine the input source type and name */
1125         if (check_input_term(state, hdr->bSourceID, &iterm) < 0)
1126                 return -EINVAL;
1127
1128         master_bits = snd_usb_combine_bytes(bmaControls, csize);
1129         /* master configuration quirks */
1130         switch (state->chip->usb_id) {
1131         case USB_ID(0x08bb, 0x2702):
1132                 snd_printk(KERN_INFO
1133                            "usbmixer: master volume quirk for PCM2702 chip\n");
1134                 /* disable non-functional volume control */
1135                 master_bits &= ~UAC_CONTROL_BIT(UAC_FU_VOLUME);
1136                 break;
1137         }
1138         if (channels > 0)
1139                 first_ch_bits = snd_usb_combine_bytes(bmaControls + csize, csize);
1140         else
1141                 first_ch_bits = 0;
1142
1143         if (state->mixer->protocol == UAC_VERSION_1) {
1144                 /* check all control types */
1145                 for (i = 0; i < 10; i++) {
1146                         unsigned int ch_bits = 0;
1147                         for (j = 0; j < channels; j++) {
1148                                 unsigned int mask = snd_usb_combine_bytes(bmaControls + csize * (j+1), csize);
1149                                 if (mask & (1 << i))
1150                                         ch_bits |= (1 << j);
1151                         }
1152                         /* audio class v1 controls are never read-only */
1153                         if (ch_bits & 1) /* the first channel must be set (for ease of programming) */
1154                                 build_feature_ctl(state, _ftr, ch_bits, i, &iterm, unitid, 0);
1155                         if (master_bits & (1 << i))
1156                                 build_feature_ctl(state, _ftr, 0, i, &iterm, unitid, 0);
1157                 }
1158         } else { /* UAC_VERSION_2 */
1159                 for (i = 0; i < 30/2; i++) {
1160                         /* From the USB Audio spec v2.0:
1161                            bmaControls() is a (ch+1)-element array of 4-byte bitmaps,
1162                            each containing a set of bit pairs. If a Control is present,
1163                            it must be Host readable. If a certain Control is not
1164                            present then the bit pair must be set to 0b00.
1165                            If a Control is present but read-only, the bit pair must be
1166                            set to 0b01. If a Control is also Host programmable, the bit
1167                            pair must be set to 0b11. The value 0b10 is not allowed. */
1168                         unsigned int ch_bits = 0;
1169                         unsigned int ch_read_only = 0;
1170
1171                         for (j = 0; j < channels; j++) {
1172                                 unsigned int mask = snd_usb_combine_bytes(bmaControls + csize * (j+1), csize);
1173                                 if (uac2_control_is_readable(mask, i)) {
1174                                         ch_bits |= (1 << j);
1175                                         if (!uac2_control_is_writeable(mask, i))
1176                                                 ch_read_only |= (1 << j);
1177                                 }
1178                         }
1179
1180                         /* NOTE: build_feature_ctl() will mark the control read-only if all channels
1181                          * are marked read-only in the descriptors. Otherwise, the control will be
1182                          * reported as writeable, but the driver will not actually issue a write
1183                          * command for read-only channels */
1184                         if (ch_bits & 1) /* the first channel must be set (for ease of programming) */
1185                                 build_feature_ctl(state, _ftr, ch_bits, i, &iterm, unitid, ch_read_only);
1186                         if (uac2_control_is_readable(master_bits, i))
1187                                 build_feature_ctl(state, _ftr, 0, i, &iterm, unitid,
1188                                                   !uac2_control_is_writeable(master_bits, i));
1189                 }
1190         }
1191
1192         return 0;
1193 }
1194
1195
1196 /*
1197  * Mixer Unit
1198  */
1199
1200 /*
1201  * build a mixer unit control
1202  *
1203  * the callbacks are identical with feature unit.
1204  * input channel number (zero based) is given in control field instead.
1205  */
1206
1207 static void build_mixer_unit_ctl(struct mixer_build *state,
1208                                  struct uac_mixer_unit_descriptor *desc,
1209                                  int in_pin, int in_ch, int unitid,
1210                                  struct usb_audio_term *iterm)
1211 {
1212         struct usb_mixer_elem_info *cval;
1213         unsigned int num_outs = uac_mixer_unit_bNrChannels(desc);
1214         unsigned int i, len;
1215         struct snd_kcontrol *kctl;
1216         const struct usbmix_name_map *map;
1217
1218         map = find_map(state, unitid, 0);
1219         if (check_ignored_ctl(map))
1220                 return;
1221
1222         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1223         if (! cval)
1224                 return;
1225
1226         cval->mixer = state->mixer;
1227         cval->id = unitid;
1228         cval->control = in_ch + 1; /* based on 1 */
1229         cval->val_type = USB_MIXER_S16;
1230         for (i = 0; i < num_outs; i++) {
1231                 if (check_matrix_bitmap(uac_mixer_unit_bmControls(desc, state->mixer->protocol), in_ch, i, num_outs)) {
1232                         cval->cmask |= (1 << i);
1233                         cval->channels++;
1234                 }
1235         }
1236
1237         /* get min/max values */
1238         get_min_max(cval, 0);
1239
1240         kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
1241         if (! kctl) {
1242                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1243                 kfree(cval);
1244                 return;
1245         }
1246         kctl->private_free = usb_mixer_elem_free;
1247
1248         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
1249         if (! len)
1250                 len = get_term_name(state, iterm, kctl->id.name, sizeof(kctl->id.name), 0);
1251         if (! len)
1252                 len = sprintf(kctl->id.name, "Mixer Source %d", in_ch + 1);
1253         append_ctl_name(kctl, " Volume");
1254
1255         snd_printdd(KERN_INFO "[%d] MU [%s] ch = %d, val = %d/%d\n",
1256                     cval->id, kctl->id.name, cval->channels, cval->min, cval->max);
1257         add_control_to_empty(state, kctl);
1258 }
1259
1260
1261 /*
1262  * parse a mixer unit
1263  */
1264 static int parse_audio_mixer_unit(struct mixer_build *state, int unitid, void *raw_desc)
1265 {
1266         struct uac_mixer_unit_descriptor *desc = raw_desc;
1267         struct usb_audio_term iterm;
1268         int input_pins, num_ins, num_outs;
1269         int pin, ich, err;
1270
1271         if (desc->bLength < 11 || ! (input_pins = desc->bNrInPins) || ! (num_outs = uac_mixer_unit_bNrChannels(desc))) {
1272                 snd_printk(KERN_ERR "invalid MIXER UNIT descriptor %d\n", unitid);
1273                 return -EINVAL;
1274         }
1275         /* no bmControls field (e.g. Maya44) -> ignore */
1276         if (desc->bLength <= 10 + input_pins) {
1277                 snd_printdd(KERN_INFO "MU %d has no bmControls field\n", unitid);
1278                 return 0;
1279         }
1280
1281         num_ins = 0;
1282         ich = 0;
1283         for (pin = 0; pin < input_pins; pin++) {
1284                 err = parse_audio_unit(state, desc->baSourceID[pin]);
1285                 if (err < 0)
1286                         return err;
1287                 err = check_input_term(state, desc->baSourceID[pin], &iterm);
1288                 if (err < 0)
1289                         return err;
1290                 num_ins += iterm.channels;
1291                 for (; ich < num_ins; ++ich) {
1292                         int och, ich_has_controls = 0;
1293
1294                         for (och = 0; och < num_outs; ++och) {
1295                                 if (check_matrix_bitmap(uac_mixer_unit_bmControls(desc, state->mixer->protocol),
1296                                                         ich, och, num_outs)) {
1297                                         ich_has_controls = 1;
1298                                         break;
1299                                 }
1300                         }
1301                         if (ich_has_controls)
1302                                 build_mixer_unit_ctl(state, desc, pin, ich,
1303                                                      unitid, &iterm);
1304                 }
1305         }
1306         return 0;
1307 }
1308
1309
1310 /*
1311  * Processing Unit / Extension Unit
1312  */
1313
1314 /* get callback for processing/extension unit */
1315 static int mixer_ctl_procunit_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1316 {
1317         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1318         int err, val;
1319
1320         err = get_cur_ctl_value(cval, cval->control << 8, &val);
1321         if (err < 0 && cval->mixer->ignore_ctl_error) {
1322                 ucontrol->value.integer.value[0] = cval->min;
1323                 return 0;
1324         }
1325         if (err < 0)
1326                 return err;
1327         val = get_relative_value(cval, val);
1328         ucontrol->value.integer.value[0] = val;
1329         return 0;
1330 }
1331
1332 /* put callback for processing/extension unit */
1333 static int mixer_ctl_procunit_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1334 {
1335         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1336         int val, oval, err;
1337
1338         err = get_cur_ctl_value(cval, cval->control << 8, &oval);
1339         if (err < 0) {
1340                 if (cval->mixer->ignore_ctl_error)
1341                         return 0;
1342                 return err;
1343         }
1344         val = ucontrol->value.integer.value[0];
1345         val = get_abs_value(cval, val);
1346         if (val != oval) {
1347                 set_cur_ctl_value(cval, cval->control << 8, val);
1348                 return 1;
1349         }
1350         return 0;
1351 }
1352
1353 /* alsa control interface for processing/extension unit */
1354 static struct snd_kcontrol_new mixer_procunit_ctl = {
1355         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1356         .name = "", /* will be filled later */
1357         .info = mixer_ctl_feature_info,
1358         .get = mixer_ctl_procunit_get,
1359         .put = mixer_ctl_procunit_put,
1360 };
1361
1362
1363 /*
1364  * predefined data for processing units
1365  */
1366 struct procunit_value_info {
1367         int control;
1368         char *suffix;
1369         int val_type;
1370         int min_value;
1371 };
1372
1373 struct procunit_info {
1374         int type;
1375         char *name;
1376         struct procunit_value_info *values;
1377 };
1378
1379 static struct procunit_value_info updown_proc_info[] = {
1380         { UAC_UD_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1381         { UAC_UD_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
1382         { 0 }
1383 };
1384 static struct procunit_value_info prologic_proc_info[] = {
1385         { UAC_DP_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1386         { UAC_DP_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
1387         { 0 }
1388 };
1389 static struct procunit_value_info threed_enh_proc_info[] = {
1390         { UAC_3D_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1391         { UAC_3D_SPACE, "Spaciousness", USB_MIXER_U8 },
1392         { 0 }
1393 };
1394 static struct procunit_value_info reverb_proc_info[] = {
1395         { UAC_REVERB_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1396         { UAC_REVERB_LEVEL, "Level", USB_MIXER_U8 },
1397         { UAC_REVERB_TIME, "Time", USB_MIXER_U16 },
1398         { UAC_REVERB_FEEDBACK, "Feedback", USB_MIXER_U8 },
1399         { 0 }
1400 };
1401 static struct procunit_value_info chorus_proc_info[] = {
1402         { UAC_CHORUS_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1403         { UAC_CHORUS_LEVEL, "Level", USB_MIXER_U8 },
1404         { UAC_CHORUS_RATE, "Rate", USB_MIXER_U16 },
1405         { UAC_CHORUS_DEPTH, "Depth", USB_MIXER_U16 },
1406         { 0 }
1407 };
1408 static struct procunit_value_info dcr_proc_info[] = {
1409         { UAC_DCR_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1410         { UAC_DCR_RATE, "Ratio", USB_MIXER_U16 },
1411         { UAC_DCR_MAXAMPL, "Max Amp", USB_MIXER_S16 },
1412         { UAC_DCR_THRESHOLD, "Threshold", USB_MIXER_S16 },
1413         { UAC_DCR_ATTACK_TIME, "Attack Time", USB_MIXER_U16 },
1414         { UAC_DCR_RELEASE_TIME, "Release Time", USB_MIXER_U16 },
1415         { 0 }
1416 };
1417
1418 static struct procunit_info procunits[] = {
1419         { UAC_PROCESS_UP_DOWNMIX, "Up Down", updown_proc_info },
1420         { UAC_PROCESS_DOLBY_PROLOGIC, "Dolby Prologic", prologic_proc_info },
1421         { UAC_PROCESS_STEREO_EXTENDER, "3D Stereo Extender", threed_enh_proc_info },
1422         { UAC_PROCESS_REVERB, "Reverb", reverb_proc_info },
1423         { UAC_PROCESS_CHORUS, "Chorus", chorus_proc_info },
1424         { UAC_PROCESS_DYN_RANGE_COMP, "DCR", dcr_proc_info },
1425         { 0 },
1426 };
1427 /*
1428  * predefined data for extension units
1429  */
1430 static struct procunit_value_info clock_rate_xu_info[] = {
1431         { USB_XU_CLOCK_RATE_SELECTOR, "Selector", USB_MIXER_U8, 0 },
1432         { 0 }
1433 };
1434 static struct procunit_value_info clock_source_xu_info[] = {
1435         { USB_XU_CLOCK_SOURCE_SELECTOR, "External", USB_MIXER_BOOLEAN },
1436         { 0 }
1437 };
1438 static struct procunit_value_info spdif_format_xu_info[] = {
1439         { USB_XU_DIGITAL_FORMAT_SELECTOR, "SPDIF/AC3", USB_MIXER_BOOLEAN },
1440         { 0 }
1441 };
1442 static struct procunit_value_info soft_limit_xu_info[] = {
1443         { USB_XU_SOFT_LIMIT_SELECTOR, " ", USB_MIXER_BOOLEAN },
1444         { 0 }
1445 };
1446 static struct procunit_info extunits[] = {
1447         { USB_XU_CLOCK_RATE, "Clock rate", clock_rate_xu_info },
1448         { USB_XU_CLOCK_SOURCE, "DigitalIn CLK source", clock_source_xu_info },
1449         { USB_XU_DIGITAL_IO_STATUS, "DigitalOut format:", spdif_format_xu_info },
1450         { USB_XU_DEVICE_OPTIONS, "AnalogueIn Soft Limit", soft_limit_xu_info },
1451         { 0 }
1452 };
1453 /*
1454  * build a processing/extension unit
1455  */
1456 static int build_audio_procunit(struct mixer_build *state, int unitid, void *raw_desc, struct procunit_info *list, char *name)
1457 {
1458         struct uac_processing_unit_descriptor *desc = raw_desc;
1459         int num_ins = desc->bNrInPins;
1460         struct usb_mixer_elem_info *cval;
1461         struct snd_kcontrol *kctl;
1462         int i, err, nameid, type, len;
1463         struct procunit_info *info;
1464         struct procunit_value_info *valinfo;
1465         const struct usbmix_name_map *map;
1466         static struct procunit_value_info default_value_info[] = {
1467                 { 0x01, "Switch", USB_MIXER_BOOLEAN },
1468                 { 0 }
1469         };
1470         static struct procunit_info default_info = {
1471                 0, NULL, default_value_info
1472         };
1473
1474         if (desc->bLength < 13 || desc->bLength < 13 + num_ins ||
1475             desc->bLength < num_ins + uac_processing_unit_bControlSize(desc, state->mixer->protocol)) {
1476                 snd_printk(KERN_ERR "invalid %s descriptor (id %d)\n", name, unitid);
1477                 return -EINVAL;
1478         }
1479
1480         for (i = 0; i < num_ins; i++) {
1481                 if ((err = parse_audio_unit(state, desc->baSourceID[i])) < 0)
1482                         return err;
1483         }
1484
1485         type = le16_to_cpu(desc->wProcessType);
1486         for (info = list; info && info->type; info++)
1487                 if (info->type == type)
1488                         break;
1489         if (! info || ! info->type)
1490                 info = &default_info;
1491
1492         for (valinfo = info->values; valinfo->control; valinfo++) {
1493                 __u8 *controls = uac_processing_unit_bmControls(desc, state->mixer->protocol);
1494
1495                 if (! (controls[valinfo->control / 8] & (1 << ((valinfo->control % 8) - 1))))
1496                         continue;
1497                 map = find_map(state, unitid, valinfo->control);
1498                 if (check_ignored_ctl(map))
1499                         continue;
1500                 cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1501                 if (! cval) {
1502                         snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1503                         return -ENOMEM;
1504                 }
1505                 cval->mixer = state->mixer;
1506                 cval->id = unitid;
1507                 cval->control = valinfo->control;
1508                 cval->val_type = valinfo->val_type;
1509                 cval->channels = 1;
1510
1511                 /* get min/max values */
1512                 if (type == UAC_PROCESS_UP_DOWNMIX && cval->control == UAC_UD_MODE_SELECT) {
1513                         __u8 *control_spec = uac_processing_unit_specific(desc, state->mixer->protocol);
1514                         /* FIXME: hard-coded */
1515                         cval->min = 1;
1516                         cval->max = control_spec[0];
1517                         cval->res = 1;
1518                         cval->initialized = 1;
1519                 } else {
1520                         if (type == USB_XU_CLOCK_RATE) {
1521                                 /* E-Mu USB 0404/0202/TrackerPre
1522                                  * samplerate control quirk
1523                                  */
1524                                 cval->min = 0;
1525                                 cval->max = 5;
1526                                 cval->res = 1;
1527                                 cval->initialized = 1;
1528                         } else
1529                                 get_min_max(cval, valinfo->min_value);
1530                 }
1531
1532                 kctl = snd_ctl_new1(&mixer_procunit_ctl, cval);
1533                 if (! kctl) {
1534                         snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1535                         kfree(cval);
1536                         return -ENOMEM;
1537                 }
1538                 kctl->private_free = usb_mixer_elem_free;
1539
1540                 if (check_mapped_name(map, kctl->id.name,
1541                                                 sizeof(kctl->id.name)))
1542                         /* nothing */ ;
1543                 else if (info->name)
1544                         strlcpy(kctl->id.name, info->name, sizeof(kctl->id.name));
1545                 else {
1546                         nameid = uac_processing_unit_iProcessing(desc, state->mixer->protocol);
1547                         len = 0;
1548                         if (nameid)
1549                                 len = snd_usb_copy_string_desc(state, nameid, kctl->id.name, sizeof(kctl->id.name));
1550                         if (! len)
1551                                 strlcpy(kctl->id.name, name, sizeof(kctl->id.name));
1552                 }
1553                 append_ctl_name(kctl, " ");
1554                 append_ctl_name(kctl, valinfo->suffix);
1555
1556                 snd_printdd(KERN_INFO "[%d] PU [%s] ch = %d, val = %d/%d\n",
1557                             cval->id, kctl->id.name, cval->channels, cval->min, cval->max);
1558                 if ((err = add_control_to_empty(state, kctl)) < 0)
1559                         return err;
1560         }
1561         return 0;
1562 }
1563
1564
1565 static int parse_audio_processing_unit(struct mixer_build *state, int unitid, void *raw_desc)
1566 {
1567         return build_audio_procunit(state, unitid, raw_desc, procunits, "Processing Unit");
1568 }
1569
1570 static int parse_audio_extension_unit(struct mixer_build *state, int unitid, void *raw_desc)
1571 {
1572         /* Note that we parse extension units with processing unit descriptors.
1573          * That's ok as the layout is the same */
1574         return build_audio_procunit(state, unitid, raw_desc, extunits, "Extension Unit");
1575 }
1576
1577
1578 /*
1579  * Selector Unit
1580  */
1581
1582 /* info callback for selector unit
1583  * use an enumerator type for routing
1584  */
1585 static int mixer_ctl_selector_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
1586 {
1587         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1588         char **itemlist = (char **)kcontrol->private_value;
1589
1590         if (snd_BUG_ON(!itemlist))
1591                 return -EINVAL;
1592         uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
1593         uinfo->count = 1;
1594         uinfo->value.enumerated.items = cval->max;
1595         if ((int)uinfo->value.enumerated.item >= cval->max)
1596                 uinfo->value.enumerated.item = cval->max - 1;
1597         strcpy(uinfo->value.enumerated.name, itemlist[uinfo->value.enumerated.item]);
1598         return 0;
1599 }
1600
1601 /* get callback for selector unit */
1602 static int mixer_ctl_selector_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1603 {
1604         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1605         int val, err;
1606
1607         err = get_cur_ctl_value(cval, 0, &val);
1608         if (err < 0) {
1609                 if (cval->mixer->ignore_ctl_error) {
1610                         ucontrol->value.enumerated.item[0] = 0;
1611                         return 0;
1612                 }
1613                 return err;
1614         }
1615         val = get_relative_value(cval, val);
1616         ucontrol->value.enumerated.item[0] = val;
1617         return 0;
1618 }
1619
1620 /* put callback for selector unit */
1621 static int mixer_ctl_selector_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1622 {
1623         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1624         int val, oval, err;
1625
1626         err = get_cur_ctl_value(cval, 0, &oval);
1627         if (err < 0) {
1628                 if (cval->mixer->ignore_ctl_error)
1629                         return 0;
1630                 return err;
1631         }
1632         val = ucontrol->value.enumerated.item[0];
1633         val = get_abs_value(cval, val);
1634         if (val != oval) {
1635                 set_cur_ctl_value(cval, 0, val);
1636                 return 1;
1637         }
1638         return 0;
1639 }
1640
1641 /* alsa control interface for selector unit */
1642 static struct snd_kcontrol_new mixer_selectunit_ctl = {
1643         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1644         .name = "", /* will be filled later */
1645         .info = mixer_ctl_selector_info,
1646         .get = mixer_ctl_selector_get,
1647         .put = mixer_ctl_selector_put,
1648 };
1649
1650
1651 /* private free callback.
1652  * free both private_data and private_value
1653  */
1654 static void usb_mixer_selector_elem_free(struct snd_kcontrol *kctl)
1655 {
1656         int i, num_ins = 0;
1657
1658         if (kctl->private_data) {
1659                 struct usb_mixer_elem_info *cval = kctl->private_data;
1660                 num_ins = cval->max;
1661                 kfree(cval);
1662                 kctl->private_data = NULL;
1663         }
1664         if (kctl->private_value) {
1665                 char **itemlist = (char **)kctl->private_value;
1666                 for (i = 0; i < num_ins; i++)
1667                         kfree(itemlist[i]);
1668                 kfree(itemlist);
1669                 kctl->private_value = 0;
1670         }
1671 }
1672
1673 /*
1674  * parse a selector unit
1675  */
1676 static int parse_audio_selector_unit(struct mixer_build *state, int unitid, void *raw_desc)
1677 {
1678         struct uac_selector_unit_descriptor *desc = raw_desc;
1679         unsigned int i, nameid, len;
1680         int err;
1681         struct usb_mixer_elem_info *cval;
1682         struct snd_kcontrol *kctl;
1683         const struct usbmix_name_map *map;
1684         char **namelist;
1685
1686         if (!desc->bNrInPins || desc->bLength < 5 + desc->bNrInPins) {
1687                 snd_printk(KERN_ERR "invalid SELECTOR UNIT descriptor %d\n", unitid);
1688                 return -EINVAL;
1689         }
1690
1691         for (i = 0; i < desc->bNrInPins; i++) {
1692                 if ((err = parse_audio_unit(state, desc->baSourceID[i])) < 0)
1693                         return err;
1694         }
1695
1696         if (desc->bNrInPins == 1) /* only one ? nonsense! */
1697                 return 0;
1698
1699         map = find_map(state, unitid, 0);
1700         if (check_ignored_ctl(map))
1701                 return 0;
1702
1703         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1704         if (! cval) {
1705                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1706                 return -ENOMEM;
1707         }
1708         cval->mixer = state->mixer;
1709         cval->id = unitid;
1710         cval->val_type = USB_MIXER_U8;
1711         cval->channels = 1;
1712         cval->min = 1;
1713         cval->max = desc->bNrInPins;
1714         cval->res = 1;
1715         cval->initialized = 1;
1716
1717         namelist = kmalloc(sizeof(char *) * desc->bNrInPins, GFP_KERNEL);
1718         if (! namelist) {
1719                 snd_printk(KERN_ERR "cannot malloc\n");
1720                 kfree(cval);
1721                 return -ENOMEM;
1722         }
1723 #define MAX_ITEM_NAME_LEN       64
1724         for (i = 0; i < desc->bNrInPins; i++) {
1725                 struct usb_audio_term iterm;
1726                 len = 0;
1727                 namelist[i] = kmalloc(MAX_ITEM_NAME_LEN, GFP_KERNEL);
1728                 if (! namelist[i]) {
1729                         snd_printk(KERN_ERR "cannot malloc\n");
1730                         while (i--)
1731                                 kfree(namelist[i]);
1732                         kfree(namelist);
1733                         kfree(cval);
1734                         return -ENOMEM;
1735                 }
1736                 len = check_mapped_selector_name(state, unitid, i, namelist[i],
1737                                                  MAX_ITEM_NAME_LEN);
1738                 if (! len && check_input_term(state, desc->baSourceID[i], &iterm) >= 0)
1739                         len = get_term_name(state, &iterm, namelist[i], MAX_ITEM_NAME_LEN, 0);
1740                 if (! len)
1741                         sprintf(namelist[i], "Input %d", i);
1742         }
1743
1744         kctl = snd_ctl_new1(&mixer_selectunit_ctl, cval);
1745         if (! kctl) {
1746                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1747                 kfree(namelist);
1748                 kfree(cval);
1749                 return -ENOMEM;
1750         }
1751         kctl->private_value = (unsigned long)namelist;
1752         kctl->private_free = usb_mixer_selector_elem_free;
1753
1754         nameid = uac_selector_unit_iSelector(desc);
1755         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
1756         if (len)
1757                 ;
1758         else if (nameid)
1759                 snd_usb_copy_string_desc(state, nameid, kctl->id.name, sizeof(kctl->id.name));
1760         else {
1761                 len = get_term_name(state, &state->oterm,
1762                                     kctl->id.name, sizeof(kctl->id.name), 0);
1763                 if (! len)
1764                         strlcpy(kctl->id.name, "USB", sizeof(kctl->id.name));
1765
1766                 if ((state->oterm.type & 0xff00) == 0x0100)
1767                         append_ctl_name(kctl, " Capture Source");
1768                 else
1769                         append_ctl_name(kctl, " Playback Source");
1770         }
1771
1772         snd_printdd(KERN_INFO "[%d] SU [%s] items = %d\n",
1773                     cval->id, kctl->id.name, desc->bNrInPins);
1774         if ((err = add_control_to_empty(state, kctl)) < 0)
1775                 return err;
1776
1777         return 0;
1778 }
1779
1780
1781 /*
1782  * parse an audio unit recursively
1783  */
1784
1785 static int parse_audio_unit(struct mixer_build *state, int unitid)
1786 {
1787         unsigned char *p1;
1788
1789         if (test_and_set_bit(unitid, state->unitbitmap))
1790                 return 0; /* the unit already visited */
1791
1792         p1 = find_audio_control_unit(state, unitid);
1793         if (!p1) {
1794                 snd_printk(KERN_ERR "usbaudio: unit %d not found!\n", unitid);
1795                 return -EINVAL;
1796         }
1797
1798         switch (p1[2]) {
1799         case UAC_INPUT_TERMINAL:
1800                 return 0; /* NOP */
1801         case UAC_MIXER_UNIT:
1802                 return parse_audio_mixer_unit(state, unitid, p1);
1803         case UAC_SELECTOR_UNIT:
1804                 return parse_audio_selector_unit(state, unitid, p1);
1805         case UAC_FEATURE_UNIT:
1806                 return parse_audio_feature_unit(state, unitid, p1);
1807         case UAC_PROCESSING_UNIT_V1:
1808         /*   UAC2_EFFECT_UNIT has the same value */
1809                 if (state->mixer->protocol == UAC_VERSION_1)
1810                         return parse_audio_processing_unit(state, unitid, p1);
1811                 else
1812                         return 0; /* FIXME - effect units not implemented yet */
1813         case UAC_EXTENSION_UNIT_V1:
1814         /*   UAC2_PROCESSING_UNIT_V2 has the same value */
1815                 if (state->mixer->protocol == UAC_VERSION_1)
1816                         return parse_audio_extension_unit(state, unitid, p1);
1817                 else /* UAC_VERSION_2 */
1818                         return parse_audio_processing_unit(state, unitid, p1);
1819         default:
1820                 snd_printk(KERN_ERR "usbaudio: unit %u: unexpected type 0x%02x\n", unitid, p1[2]);
1821                 return -EINVAL;
1822         }
1823 }
1824
1825 static void snd_usb_mixer_free(struct usb_mixer_interface *mixer)
1826 {
1827         kfree(mixer->id_elems);
1828         if (mixer->urb) {
1829                 kfree(mixer->urb->transfer_buffer);
1830                 usb_free_urb(mixer->urb);
1831         }
1832         usb_free_urb(mixer->rc_urb);
1833         kfree(mixer->rc_setup_packet);
1834         kfree(mixer);
1835 }
1836
1837 static int snd_usb_mixer_dev_free(struct snd_device *device)
1838 {
1839         struct usb_mixer_interface *mixer = device->device_data;
1840         snd_usb_mixer_free(mixer);
1841         return 0;
1842 }
1843
1844 /*
1845  * create mixer controls
1846  *
1847  * walk through all UAC_OUTPUT_TERMINAL descriptors to search for mixers
1848  */
1849 static int snd_usb_mixer_controls(struct usb_mixer_interface *mixer)
1850 {
1851         struct mixer_build state;
1852         int err;
1853         const struct usbmix_ctl_map *map;
1854         struct usb_host_interface *hostif;
1855         void *p;
1856
1857         hostif = &usb_ifnum_to_if(mixer->chip->dev, mixer->ctrlif)->altsetting[0];
1858         memset(&state, 0, sizeof(state));
1859         state.chip = mixer->chip;
1860         state.mixer = mixer;
1861         state.buffer = hostif->extra;
1862         state.buflen = hostif->extralen;
1863
1864         /* check the mapping table */
1865         for (map = usbmix_ctl_maps; map->id; map++) {
1866                 if (map->id == state.chip->usb_id) {
1867                         state.map = map->map;
1868                         state.selector_map = map->selector_map;
1869                         mixer->ignore_ctl_error = map->ignore_ctl_error;
1870                         break;
1871                 }
1872         }
1873
1874         p = NULL;
1875         while ((p = snd_usb_find_csint_desc(hostif->extra, hostif->extralen, p, UAC_OUTPUT_TERMINAL)) != NULL) {
1876                 if (mixer->protocol == UAC_VERSION_1) {
1877                         struct uac_output_terminal_descriptor_v1 *desc = p;
1878
1879                         if (desc->bLength < sizeof(*desc))
1880                                 continue; /* invalid descriptor? */
1881                         set_bit(desc->bTerminalID, state.unitbitmap);  /* mark terminal ID as visited */
1882                         state.oterm.id = desc->bTerminalID;
1883                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
1884                         state.oterm.name = desc->iTerminal;
1885                         err = parse_audio_unit(&state, desc->bSourceID);
1886                         if (err < 0)
1887                                 return err;
1888                 } else { /* UAC_VERSION_2 */
1889                         struct uac2_output_terminal_descriptor *desc = p;
1890
1891                         if (desc->bLength < sizeof(*desc))
1892                                 continue; /* invalid descriptor? */
1893                         set_bit(desc->bTerminalID, state.unitbitmap);  /* mark terminal ID as visited */
1894                         state.oterm.id = desc->bTerminalID;
1895                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
1896                         state.oterm.name = desc->iTerminal;
1897                         err = parse_audio_unit(&state, desc->bSourceID);
1898                         if (err < 0)
1899                                 return err;
1900                 }
1901         }
1902
1903         return 0;
1904 }
1905
1906 void snd_usb_mixer_notify_id(struct usb_mixer_interface *mixer, int unitid)
1907 {
1908         struct usb_mixer_elem_info *info;
1909
1910         for (info = mixer->id_elems[unitid]; info; info = info->next_id_elem)
1911                 snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
1912                                info->elem_id);
1913 }
1914
1915 static void snd_usb_mixer_dump_cval(struct snd_info_buffer *buffer,
1916                                     int unitid,
1917                                     struct usb_mixer_elem_info *cval)
1918 {
1919         static char *val_types[] = {"BOOLEAN", "INV_BOOLEAN",
1920                                     "S8", "U8", "S16", "U16"};
1921         snd_iprintf(buffer, "  Unit: %i\n", unitid);
1922         if (cval->elem_id)
1923                 snd_iprintf(buffer, "    Control: name=\"%s\", index=%i\n",
1924                                 cval->elem_id->name, cval->elem_id->index);
1925         snd_iprintf(buffer, "    Info: id=%i, control=%i, cmask=0x%x, "
1926                             "channels=%i, type=\"%s\"\n", cval->id,
1927                             cval->control, cval->cmask, cval->channels,
1928                             val_types[cval->val_type]);
1929         snd_iprintf(buffer, "    Volume: min=%i, max=%i, dBmin=%i, dBmax=%i\n",
1930                             cval->min, cval->max, cval->dBmin, cval->dBmax);
1931 }
1932
1933 static void snd_usb_mixer_proc_read(struct snd_info_entry *entry,
1934                                     struct snd_info_buffer *buffer)
1935 {
1936         struct snd_usb_audio *chip = entry->private_data;
1937         struct usb_mixer_interface *mixer;
1938         struct usb_mixer_elem_info *cval;
1939         int unitid;
1940
1941         list_for_each_entry(mixer, &chip->mixer_list, list) {
1942                 snd_iprintf(buffer,
1943                         "USB Mixer: usb_id=0x%08x, ctrlif=%i, ctlerr=%i\n",
1944                                 chip->usb_id, mixer->ctrlif,
1945                                 mixer->ignore_ctl_error);
1946                 snd_iprintf(buffer, "Card: %s\n", chip->card->longname);
1947                 for (unitid = 0; unitid < MAX_ID_ELEMS; unitid++) {
1948                         for (cval = mixer->id_elems[unitid]; cval;
1949                                                 cval = cval->next_id_elem)
1950                                 snd_usb_mixer_dump_cval(buffer, unitid, cval);
1951                 }
1952         }
1953 }
1954
1955 static void snd_usb_mixer_interrupt_v2(struct usb_mixer_interface *mixer,
1956                                        int attribute, int value, int index)
1957 {
1958         struct usb_mixer_elem_info *info;
1959         __u8 unitid = (index >> 8) & 0xff;
1960         __u8 control = (value >> 8) & 0xff;
1961         __u8 channel = value & 0xff;
1962
1963         if (channel >= MAX_CHANNELS) {
1964                 snd_printk(KERN_DEBUG "%s(): bogus channel number %d\n",
1965                                 __func__, channel);
1966                 return;
1967         }
1968
1969         for (info = mixer->id_elems[unitid]; info; info = info->next_id_elem) {
1970                 if (info->control != control)
1971                         continue;
1972
1973                 switch (attribute) {
1974                 case UAC2_CS_CUR:
1975                         /* invalidate cache, so the value is read from the device */
1976                         if (channel)
1977                                 info->cached &= ~(1 << channel);
1978                         else /* master channel */
1979                                 info->cached = 0;
1980
1981                         snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
1982                                         info->elem_id);
1983                         break;
1984
1985                 case UAC2_CS_RANGE:
1986                         /* TODO */
1987                         break;
1988
1989                 case UAC2_CS_MEM:
1990                         /* TODO */
1991                         break;
1992
1993                 default:
1994                         snd_printk(KERN_DEBUG "unknown attribute %d in interrupt\n",
1995                                                 attribute);
1996                         break;
1997                 } /* switch */
1998         }
1999 }
2000
2001 static void snd_usb_mixer_interrupt(struct urb *urb)
2002 {
2003         struct usb_mixer_interface *mixer = urb->context;
2004         int len = urb->actual_length;
2005
2006         if (urb->status != 0)
2007                 goto requeue;
2008
2009         if (mixer->protocol == UAC_VERSION_1) {
2010                 struct uac1_status_word *status;
2011
2012                 for (status = urb->transfer_buffer;
2013                      len >= sizeof(*status);
2014                      len -= sizeof(*status), status++) {
2015                         snd_printd(KERN_DEBUG "status interrupt: %02x %02x\n",
2016                                                 status->bStatusType,
2017                                                 status->bOriginator);
2018
2019                         /* ignore any notifications not from the control interface */
2020                         if ((status->bStatusType & UAC1_STATUS_TYPE_ORIG_MASK) !=
2021                                 UAC1_STATUS_TYPE_ORIG_AUDIO_CONTROL_IF)
2022                                 continue;
2023
2024                         if (status->bStatusType & UAC1_STATUS_TYPE_MEM_CHANGED)
2025                                 snd_usb_mixer_rc_memory_change(mixer, status->bOriginator);
2026                         else
2027                                 snd_usb_mixer_notify_id(mixer, status->bOriginator);
2028                 }
2029         } else { /* UAC_VERSION_2 */
2030                 struct uac2_interrupt_data_msg *msg;
2031
2032                 for (msg = urb->transfer_buffer;
2033                      len >= sizeof(*msg);
2034                      len -= sizeof(*msg), msg++) {
2035                         /* drop vendor specific and endpoint requests */
2036                         if ((msg->bInfo & UAC2_INTERRUPT_DATA_MSG_VENDOR) ||
2037                             (msg->bInfo & UAC2_INTERRUPT_DATA_MSG_EP))
2038                                 continue;
2039
2040                         snd_usb_mixer_interrupt_v2(mixer, msg->bAttribute,
2041                                                    le16_to_cpu(msg->wValue),
2042                                                    le16_to_cpu(msg->wIndex));
2043                 }
2044         }
2045
2046 requeue:
2047         if (urb->status != -ENOENT && urb->status != -ECONNRESET) {
2048                 urb->dev = mixer->chip->dev;
2049                 usb_submit_urb(urb, GFP_ATOMIC);
2050         }
2051 }
2052
2053 /* create the handler for the optional status interrupt endpoint */
2054 static int snd_usb_mixer_status_create(struct usb_mixer_interface *mixer)
2055 {
2056         struct usb_host_interface *hostif;
2057         struct usb_endpoint_descriptor *ep;
2058         void *transfer_buffer;
2059         int buffer_length;
2060         unsigned int epnum;
2061
2062         hostif = &usb_ifnum_to_if(mixer->chip->dev, mixer->ctrlif)->altsetting[0];
2063         /* we need one interrupt input endpoint */
2064         if (get_iface_desc(hostif)->bNumEndpoints < 1)
2065                 return 0;
2066         ep = get_endpoint(hostif, 0);
2067         if (!usb_endpoint_dir_in(ep) || !usb_endpoint_xfer_int(ep))
2068                 return 0;
2069
2070         epnum = usb_endpoint_num(ep);
2071         buffer_length = le16_to_cpu(ep->wMaxPacketSize);
2072         transfer_buffer = kmalloc(buffer_length, GFP_KERNEL);
2073         if (!transfer_buffer)
2074                 return -ENOMEM;
2075         mixer->urb = usb_alloc_urb(0, GFP_KERNEL);
2076         if (!mixer->urb) {
2077                 kfree(transfer_buffer);
2078                 return -ENOMEM;
2079         }
2080         usb_fill_int_urb(mixer->urb, mixer->chip->dev,
2081                          usb_rcvintpipe(mixer->chip->dev, epnum),
2082                          transfer_buffer, buffer_length,
2083                          snd_usb_mixer_interrupt, mixer, ep->bInterval);
2084         usb_submit_urb(mixer->urb, GFP_KERNEL);
2085         return 0;
2086 }
2087
2088 int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif,
2089                          int ignore_error)
2090 {
2091         static struct snd_device_ops dev_ops = {
2092                 .dev_free = snd_usb_mixer_dev_free
2093         };
2094         struct usb_mixer_interface *mixer;
2095         struct snd_info_entry *entry;
2096         struct usb_host_interface *host_iface;
2097         int err;
2098
2099         strcpy(chip->card->mixername, "USB Mixer");
2100
2101         mixer = kzalloc(sizeof(*mixer), GFP_KERNEL);
2102         if (!mixer)
2103                 return -ENOMEM;
2104         mixer->chip = chip;
2105         mixer->ctrlif = ctrlif;
2106         mixer->ignore_ctl_error = ignore_error;
2107         mixer->id_elems = kcalloc(MAX_ID_ELEMS, sizeof(*mixer->id_elems),
2108                                   GFP_KERNEL);
2109         if (!mixer->id_elems) {
2110                 kfree(mixer);
2111                 return -ENOMEM;
2112         }
2113
2114         host_iface = &usb_ifnum_to_if(chip->dev, ctrlif)->altsetting[0];
2115         mixer->protocol = get_iface_desc(host_iface)->bInterfaceProtocol;
2116
2117         if ((err = snd_usb_mixer_controls(mixer)) < 0 ||
2118             (err = snd_usb_mixer_status_create(mixer)) < 0)
2119                 goto _error;
2120
2121         snd_usb_mixer_apply_create_quirk(mixer);
2122
2123         err = snd_device_new(chip->card, SNDRV_DEV_LOWLEVEL, mixer, &dev_ops);
2124         if (err < 0)
2125                 goto _error;
2126
2127         if (list_empty(&chip->mixer_list) &&
2128             !snd_card_proc_new(chip->card, "usbmixer", &entry))
2129                 snd_info_set_text_ops(entry, chip, snd_usb_mixer_proc_read);
2130
2131         list_add(&mixer->list, &chip->mixer_list);
2132         return 0;
2133
2134 _error:
2135         snd_usb_mixer_free(mixer);
2136         return err;
2137 }
2138
2139 void snd_usb_mixer_disconnect(struct list_head *p)
2140 {
2141         struct usb_mixer_interface *mixer;
2142
2143         mixer = list_entry(p, struct usb_mixer_interface, list);
2144         usb_kill_urb(mixer->urb);
2145         usb_kill_urb(mixer->rc_urb);
2146 }