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TOMOYO Linux Cross Reference
Linux/sound/usb/mixer.c

Version: ~ [ linux-5.6-rc3 ] ~ [ linux-5.5.6 ] ~ [ linux-5.4.22 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.106 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.171 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.214 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.214 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.82 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  *   (Tentative) USB Audio Driver for ALSA
  3  *
  4  *   Mixer control part
  5  *
  6  *   Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
  7  *
  8  *   Many codes borrowed from audio.c by
  9  *          Alan Cox (alan@lxorguk.ukuu.org.uk)
 10  *          Thomas Sailer (sailer@ife.ee.ethz.ch)
 11  *
 12  *
 13  *   This program is free software; you can redistribute it and/or modify
 14  *   it under the terms of the GNU General Public License as published by
 15  *   the Free Software Foundation; either version 2 of the License, or
 16  *   (at your option) any later version.
 17  *
 18  *   This program is distributed in the hope that it will be useful,
 19  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 20  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 21  *   GNU General Public License for more details.
 22  *
 23  *   You should have received a copy of the GNU General Public License
 24  *   along with this program; if not, write to the Free Software
 25  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 26  *
 27  */
 28 
 29 /*
 30  * TODOs, for both the mixer and the streaming interfaces:
 31  *
 32  *  - support for UAC2 effect units
 33  *  - support for graphical equalizers
 34  *  - RANGE and MEM set commands (UAC2)
 35  *  - RANGE and MEM interrupt dispatchers (UAC2)
 36  *  - audio channel clustering (UAC2)
 37  *  - audio sample rate converter units (UAC2)
 38  *  - proper handling of clock multipliers (UAC2)
 39  *  - dispatch clock change notifications (UAC2)
 40  *      - stop PCM streams which use a clock that became invalid
 41  *      - stop PCM streams which use a clock selector that has changed
 42  *      - parse available sample rates again when clock sources changed
 43  */
 44 
 45 #include <linux/bitops.h>
 46 #include <linux/init.h>
 47 #include <linux/list.h>
 48 #include <linux/slab.h>
 49 #include <linux/string.h>
 50 #include <linux/usb.h>
 51 #include <linux/usb/audio.h>
 52 #include <linux/usb/audio-v2.h>
 53 
 54 #include <sound/core.h>
 55 #include <sound/control.h>
 56 #include <sound/hwdep.h>
 57 #include <sound/info.h>
 58 #include <sound/tlv.h>
 59 
 60 #include "usbaudio.h"
 61 #include "mixer.h"
 62 #include "helper.h"
 63 #include "mixer_quirks.h"
 64 #include "power.h"
 65 
 66 #define MAX_ID_ELEMS    256
 67 
 68 struct usb_audio_term {
 69         int id;
 70         int type;
 71         int channels;
 72         unsigned int chconfig;
 73         int name;
 74 };
 75 
 76 struct usbmix_name_map;
 77 
 78 struct mixer_build {
 79         struct snd_usb_audio *chip;
 80         struct usb_mixer_interface *mixer;
 81         unsigned char *buffer;
 82         unsigned int buflen;
 83         DECLARE_BITMAP(unitbitmap, MAX_ID_ELEMS);
 84         struct usb_audio_term oterm;
 85         const struct usbmix_name_map *map;
 86         const struct usbmix_selector_map *selector_map;
 87 };
 88 
 89 /*E-mu 0202/0404/0204 eXtension Unit(XU) control*/
 90 enum {
 91         USB_XU_CLOCK_RATE               = 0xe301,
 92         USB_XU_CLOCK_SOURCE             = 0xe302,
 93         USB_XU_DIGITAL_IO_STATUS        = 0xe303,
 94         USB_XU_DEVICE_OPTIONS           = 0xe304,
 95         USB_XU_DIRECT_MONITORING        = 0xe305,
 96         USB_XU_METERING                 = 0xe306
 97 };
 98 enum {
 99         USB_XU_CLOCK_SOURCE_SELECTOR = 0x02,    /* clock source*/
100         USB_XU_CLOCK_RATE_SELECTOR = 0x03,      /* clock rate */
101         USB_XU_DIGITAL_FORMAT_SELECTOR = 0x01,  /* the spdif format */
102         USB_XU_SOFT_LIMIT_SELECTOR = 0x03       /* soft limiter */
103 };
104 
105 /*
106  * manual mapping of mixer names
107  * if the mixer topology is too complicated and the parsed names are
108  * ambiguous, add the entries in usbmixer_maps.c.
109  */
110 #include "mixer_maps.c"
111 
112 static const struct usbmix_name_map *
113 find_map(struct mixer_build *state, int unitid, int control)
114 {
115         const struct usbmix_name_map *p = state->map;
116 
117         if (!p)
118                 return NULL;
119 
120         for (p = state->map; p->id; p++) {
121                 if (p->id == unitid &&
122                     (!control || !p->control || control == p->control))
123                         return p;
124         }
125         return NULL;
126 }
127 
128 /* get the mapped name if the unit matches */
129 static int
130 check_mapped_name(const struct usbmix_name_map *p, char *buf, int buflen)
131 {
132         if (!p || !p->name)
133                 return 0;
134 
135         buflen--;
136         return strlcpy(buf, p->name, buflen);
137 }
138 
139 /* check whether the control should be ignored */
140 static inline int
141 check_ignored_ctl(const struct usbmix_name_map *p)
142 {
143         if (!p || p->name || p->dB)
144                 return 0;
145         return 1;
146 }
147 
148 /* dB mapping */
149 static inline void check_mapped_dB(const struct usbmix_name_map *p,
150                                    struct usb_mixer_elem_info *cval)
151 {
152         if (p && p->dB) {
153                 cval->dBmin = p->dB->min;
154                 cval->dBmax = p->dB->max;
155                 cval->initialized = 1;
156         }
157 }
158 
159 /* get the mapped selector source name */
160 static int check_mapped_selector_name(struct mixer_build *state, int unitid,
161                                       int index, char *buf, int buflen)
162 {
163         const struct usbmix_selector_map *p;
164 
165         if (!state->selector_map)
166                 return 0;
167         for (p = state->selector_map; p->id; p++) {
168                 if (p->id == unitid && index < p->count)
169                         return strlcpy(buf, p->names[index], buflen);
170         }
171         return 0;
172 }
173 
174 /*
175  * find an audio control unit with the given unit id
176  */
177 static void *find_audio_control_unit(struct mixer_build *state,
178                                      unsigned char unit)
179 {
180         /* we just parse the header */
181         struct uac_feature_unit_descriptor *hdr = NULL;
182 
183         while ((hdr = snd_usb_find_desc(state->buffer, state->buflen, hdr,
184                                         USB_DT_CS_INTERFACE)) != NULL) {
185                 if (hdr->bLength >= 4 &&
186                     hdr->bDescriptorSubtype >= UAC_INPUT_TERMINAL &&
187                     hdr->bDescriptorSubtype <= UAC2_SAMPLE_RATE_CONVERTER &&
188                     hdr->bUnitID == unit)
189                         return hdr;
190         }
191 
192         return NULL;
193 }
194 
195 /*
196  * copy a string with the given id
197  */
198 static int snd_usb_copy_string_desc(struct mixer_build *state,
199                                     int index, char *buf, int maxlen)
200 {
201         int len = usb_string(state->chip->dev, index, buf, maxlen - 1);
202         buf[len] = 0;
203         return len;
204 }
205 
206 /*
207  * convert from the byte/word on usb descriptor to the zero-based integer
208  */
209 static int convert_signed_value(struct usb_mixer_elem_info *cval, int val)
210 {
211         switch (cval->val_type) {
212         case USB_MIXER_BOOLEAN:
213                 return !!val;
214         case USB_MIXER_INV_BOOLEAN:
215                 return !val;
216         case USB_MIXER_U8:
217                 val &= 0xff;
218                 break;
219         case USB_MIXER_S8:
220                 val &= 0xff;
221                 if (val >= 0x80)
222                         val -= 0x100;
223                 break;
224         case USB_MIXER_U16:
225                 val &= 0xffff;
226                 break;
227         case USB_MIXER_S16:
228                 val &= 0xffff;
229                 if (val >= 0x8000)
230                         val -= 0x10000;
231                 break;
232         }
233         return val;
234 }
235 
236 /*
237  * convert from the zero-based int to the byte/word for usb descriptor
238  */
239 static int convert_bytes_value(struct usb_mixer_elem_info *cval, int val)
240 {
241         switch (cval->val_type) {
242         case USB_MIXER_BOOLEAN:
243                 return !!val;
244         case USB_MIXER_INV_BOOLEAN:
245                 return !val;
246         case USB_MIXER_S8:
247         case USB_MIXER_U8:
248                 return val & 0xff;
249         case USB_MIXER_S16:
250         case USB_MIXER_U16:
251                 return val & 0xffff;
252         }
253         return 0; /* not reached */
254 }
255 
256 static int get_relative_value(struct usb_mixer_elem_info *cval, int val)
257 {
258         if (!cval->res)
259                 cval->res = 1;
260         if (val < cval->min)
261                 return 0;
262         else if (val >= cval->max)
263                 return (cval->max - cval->min + cval->res - 1) / cval->res;
264         else
265                 return (val - cval->min) / cval->res;
266 }
267 
268 static int get_abs_value(struct usb_mixer_elem_info *cval, int val)
269 {
270         if (val < 0)
271                 return cval->min;
272         if (!cval->res)
273                 cval->res = 1;
274         val *= cval->res;
275         val += cval->min;
276         if (val > cval->max)
277                 return cval->max;
278         return val;
279 }
280 
281 
282 /*
283  * retrieve a mixer value
284  */
285 
286 static int get_ctl_value_v1(struct usb_mixer_elem_info *cval, int request,
287                             int validx, int *value_ret)
288 {
289         struct snd_usb_audio *chip = cval->mixer->chip;
290         unsigned char buf[2];
291         int val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
292         int timeout = 10;
293         int idx = 0, err;
294 
295         err = snd_usb_autoresume(cval->mixer->chip);
296         if (err < 0)
297                 return -EIO;
298 
299         down_read(&chip->shutdown_rwsem);
300         while (timeout-- > 0) {
301                 if (chip->shutdown)
302                         break;
303                 idx = snd_usb_ctrl_intf(chip) | (cval->id << 8);
304                 if (snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), request,
305                                     USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
306                                     validx, idx, buf, val_len) >= val_len) {
307                         *value_ret = convert_signed_value(cval, snd_usb_combine_bytes(buf, val_len));
308                         err = 0;
309                         goto out;
310                 }
311         }
312         usb_audio_dbg(chip,
313                 "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
314                 request, validx, idx, cval->val_type);
315         err = -EINVAL;
316 
317  out:
318         up_read(&chip->shutdown_rwsem);
319         snd_usb_autosuspend(cval->mixer->chip);
320         return err;
321 }
322 
323 static int get_ctl_value_v2(struct usb_mixer_elem_info *cval, int request,
324                             int validx, int *value_ret)
325 {
326         struct snd_usb_audio *chip = cval->mixer->chip;
327         unsigned char buf[2 + 3 * sizeof(__u16)]; /* enough space for one range */
328         unsigned char *val;
329         int idx = 0, ret, size;
330         __u8 bRequest;
331 
332         if (request == UAC_GET_CUR) {
333                 bRequest = UAC2_CS_CUR;
334                 size = sizeof(__u16);
335         } else {
336                 bRequest = UAC2_CS_RANGE;
337                 size = sizeof(buf);
338         }
339 
340         memset(buf, 0, sizeof(buf));
341 
342         ret = snd_usb_autoresume(chip) ? -EIO : 0;
343         if (ret)
344                 goto error;
345 
346         down_read(&chip->shutdown_rwsem);
347         if (chip->shutdown) {
348                 ret = -ENODEV;
349         } else {
350                 idx = snd_usb_ctrl_intf(chip) | (cval->id << 8);
351                 ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), bRequest,
352                               USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
353                               validx, idx, buf, size);
354         }
355         up_read(&chip->shutdown_rwsem);
356         snd_usb_autosuspend(chip);
357 
358         if (ret < 0) {
359 error:
360                 usb_audio_err(chip,
361                         "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
362                         request, validx, idx, cval->val_type);
363                 return ret;
364         }
365 
366         /* FIXME: how should we handle multiple triplets here? */
367 
368         switch (request) {
369         case UAC_GET_CUR:
370                 val = buf;
371                 break;
372         case UAC_GET_MIN:
373                 val = buf + sizeof(__u16);
374                 break;
375         case UAC_GET_MAX:
376                 val = buf + sizeof(__u16) * 2;
377                 break;
378         case UAC_GET_RES:
379                 val = buf + sizeof(__u16) * 3;
380                 break;
381         default:
382                 return -EINVAL;
383         }
384 
385         *value_ret = convert_signed_value(cval, snd_usb_combine_bytes(val, sizeof(__u16)));
386 
387         return 0;
388 }
389 
390 static int get_ctl_value(struct usb_mixer_elem_info *cval, int request,
391                          int validx, int *value_ret)
392 {
393         validx += cval->idx_off;
394 
395         return (cval->mixer->protocol == UAC_VERSION_1) ?
396                 get_ctl_value_v1(cval, request, validx, value_ret) :
397                 get_ctl_value_v2(cval, request, validx, value_ret);
398 }
399 
400 static int get_cur_ctl_value(struct usb_mixer_elem_info *cval,
401                              int validx, int *value)
402 {
403         return get_ctl_value(cval, UAC_GET_CUR, validx, value);
404 }
405 
406 /* channel = 0: master, 1 = first channel */
407 static inline int get_cur_mix_raw(struct usb_mixer_elem_info *cval,
408                                   int channel, int *value)
409 {
410         return get_ctl_value(cval, UAC_GET_CUR,
411                              (cval->control << 8) | channel,
412                              value);
413 }
414 
415 static int get_cur_mix_value(struct usb_mixer_elem_info *cval,
416                              int channel, int index, int *value)
417 {
418         int err;
419 
420         if (cval->cached & (1 << channel)) {
421                 *value = cval->cache_val[index];
422                 return 0;
423         }
424         err = get_cur_mix_raw(cval, channel, value);
425         if (err < 0) {
426                 if (!cval->mixer->ignore_ctl_error)
427                         usb_audio_dbg(cval->mixer->chip,
428                                 "cannot get current value for control %d ch %d: err = %d\n",
429                                       cval->control, channel, err);
430                 return err;
431         }
432         cval->cached |= 1 << channel;
433         cval->cache_val[index] = *value;
434         return 0;
435 }
436 
437 /*
438  * set a mixer value
439  */
440 
441 int snd_usb_mixer_set_ctl_value(struct usb_mixer_elem_info *cval,
442                                 int request, int validx, int value_set)
443 {
444         struct snd_usb_audio *chip = cval->mixer->chip;
445         unsigned char buf[2];
446         int idx = 0, val_len, err, timeout = 10;
447 
448         validx += cval->idx_off;
449 
450         if (cval->mixer->protocol == UAC_VERSION_1) {
451                 val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
452         } else { /* UAC_VERSION_2 */
453                 /* audio class v2 controls are always 2 bytes in size */
454                 val_len = sizeof(__u16);
455 
456                 /* FIXME */
457                 if (request != UAC_SET_CUR) {
458                         usb_audio_dbg(chip, "RANGE setting not yet supported\n");
459                         return -EINVAL;
460                 }
461 
462                 request = UAC2_CS_CUR;
463         }
464 
465         value_set = convert_bytes_value(cval, value_set);
466         buf[0] = value_set & 0xff;
467         buf[1] = (value_set >> 8) & 0xff;
468         err = snd_usb_autoresume(chip);
469         if (err < 0)
470                 return -EIO;
471         down_read(&chip->shutdown_rwsem);
472         while (timeout-- > 0) {
473                 if (chip->shutdown)
474                         break;
475                 idx = snd_usb_ctrl_intf(chip) | (cval->id << 8);
476                 if (snd_usb_ctl_msg(chip->dev,
477                                     usb_sndctrlpipe(chip->dev, 0), request,
478                                     USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
479                                     validx, idx, buf, val_len) >= 0) {
480                         err = 0;
481                         goto out;
482                 }
483         }
484         usb_audio_dbg(chip, "cannot set ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d, data = %#x/%#x\n",
485                       request, validx, idx, cval->val_type, buf[0], buf[1]);
486         err = -EINVAL;
487 
488  out:
489         up_read(&chip->shutdown_rwsem);
490         snd_usb_autosuspend(chip);
491         return err;
492 }
493 
494 static int set_cur_ctl_value(struct usb_mixer_elem_info *cval,
495                              int validx, int value)
496 {
497         return snd_usb_mixer_set_ctl_value(cval, UAC_SET_CUR, validx, value);
498 }
499 
500 static int set_cur_mix_value(struct usb_mixer_elem_info *cval, int channel,
501                              int index, int value)
502 {
503         int err;
504         unsigned int read_only = (channel == 0) ?
505                 cval->master_readonly :
506                 cval->ch_readonly & (1 << (channel - 1));
507 
508         if (read_only) {
509                 usb_audio_dbg(cval->mixer->chip,
510                               "%s(): channel %d of control %d is read_only\n",
511                             __func__, channel, cval->control);
512                 return 0;
513         }
514 
515         err = snd_usb_mixer_set_ctl_value(cval,
516                                           UAC_SET_CUR, (cval->control << 8) | channel,
517                                           value);
518         if (err < 0)
519                 return err;
520         cval->cached |= 1 << channel;
521         cval->cache_val[index] = value;
522         return 0;
523 }
524 
525 /*
526  * TLV callback for mixer volume controls
527  */
528 int snd_usb_mixer_vol_tlv(struct snd_kcontrol *kcontrol, int op_flag,
529                          unsigned int size, unsigned int __user *_tlv)
530 {
531         struct usb_mixer_elem_info *cval = kcontrol->private_data;
532         DECLARE_TLV_DB_MINMAX(scale, 0, 0);
533 
534         if (size < sizeof(scale))
535                 return -ENOMEM;
536         scale[2] = cval->dBmin;
537         scale[3] = cval->dBmax;
538         if (copy_to_user(_tlv, scale, sizeof(scale)))
539                 return -EFAULT;
540         return 0;
541 }
542 
543 /*
544  * parser routines begin here...
545  */
546 
547 static int parse_audio_unit(struct mixer_build *state, int unitid);
548 
549 
550 /*
551  * check if the input/output channel routing is enabled on the given bitmap.
552  * used for mixer unit parser
553  */
554 static int check_matrix_bitmap(unsigned char *bmap,
555                                int ich, int och, int num_outs)
556 {
557         int idx = ich * num_outs + och;
558         return bmap[idx >> 3] & (0x80 >> (idx & 7));
559 }
560 
561 /*
562  * add an alsa control element
563  * search and increment the index until an empty slot is found.
564  *
565  * if failed, give up and free the control instance.
566  */
567 
568 int snd_usb_mixer_add_control(struct usb_mixer_interface *mixer,
569                               struct snd_kcontrol *kctl)
570 {
571         struct usb_mixer_elem_info *cval = kctl->private_data;
572         int err;
573 
574         while (snd_ctl_find_id(mixer->chip->card, &kctl->id))
575                 kctl->id.index++;
576         if ((err = snd_ctl_add(mixer->chip->card, kctl)) < 0) {
577                 usb_audio_dbg(mixer->chip, "cannot add control (err = %d)\n",
578                               err);
579                 return err;
580         }
581         cval->elem_id = &kctl->id;
582         cval->next_id_elem = mixer->id_elems[cval->id];
583         mixer->id_elems[cval->id] = cval;
584         return 0;
585 }
586 
587 /*
588  * get a terminal name string
589  */
590 
591 static struct iterm_name_combo {
592         int type;
593         char *name;
594 } iterm_names[] = {
595         { 0x0300, "Output" },
596         { 0x0301, "Speaker" },
597         { 0x0302, "Headphone" },
598         { 0x0303, "HMD Audio" },
599         { 0x0304, "Desktop Speaker" },
600         { 0x0305, "Room Speaker" },
601         { 0x0306, "Com Speaker" },
602         { 0x0307, "LFE" },
603         { 0x0600, "External In" },
604         { 0x0601, "Analog In" },
605         { 0x0602, "Digital In" },
606         { 0x0603, "Line" },
607         { 0x0604, "Legacy In" },
608         { 0x0605, "IEC958 In" },
609         { 0x0606, "1394 DA Stream" },
610         { 0x0607, "1394 DV Stream" },
611         { 0x0700, "Embedded" },
612         { 0x0701, "Noise Source" },
613         { 0x0702, "Equalization Noise" },
614         { 0x0703, "CD" },
615         { 0x0704, "DAT" },
616         { 0x0705, "DCC" },
617         { 0x0706, "MiniDisk" },
618         { 0x0707, "Analog Tape" },
619         { 0x0708, "Phonograph" },
620         { 0x0709, "VCR Audio" },
621         { 0x070a, "Video Disk Audio" },
622         { 0x070b, "DVD Audio" },
623         { 0x070c, "TV Tuner Audio" },
624         { 0x070d, "Satellite Rec Audio" },
625         { 0x070e, "Cable Tuner Audio" },
626         { 0x070f, "DSS Audio" },
627         { 0x0710, "Radio Receiver" },
628         { 0x0711, "Radio Transmitter" },
629         { 0x0712, "Multi-Track Recorder" },
630         { 0x0713, "Synthesizer" },
631         { 0 },
632 };
633 
634 static int get_term_name(struct mixer_build *state, struct usb_audio_term *iterm,
635                          unsigned char *name, int maxlen, int term_only)
636 {
637         struct iterm_name_combo *names;
638 
639         if (iterm->name)
640                 return snd_usb_copy_string_desc(state, iterm->name,
641                                                 name, maxlen);
642 
643         /* virtual type - not a real terminal */
644         if (iterm->type >> 16) {
645                 if (term_only)
646                         return 0;
647                 switch (iterm->type >> 16) {
648                 case UAC_SELECTOR_UNIT:
649                         strcpy(name, "Selector");
650                         return 8;
651                 case UAC1_PROCESSING_UNIT:
652                         strcpy(name, "Process Unit");
653                         return 12;
654                 case UAC1_EXTENSION_UNIT:
655                         strcpy(name, "Ext Unit");
656                         return 8;
657                 case UAC_MIXER_UNIT:
658                         strcpy(name, "Mixer");
659                         return 5;
660                 default:
661                         return sprintf(name, "Unit %d", iterm->id);
662                 }
663         }
664 
665         switch (iterm->type & 0xff00) {
666         case 0x0100:
667                 strcpy(name, "PCM");
668                 return 3;
669         case 0x0200:
670                 strcpy(name, "Mic");
671                 return 3;
672         case 0x0400:
673                 strcpy(name, "Headset");
674                 return 7;
675         case 0x0500:
676                 strcpy(name, "Phone");
677                 return 5;
678         }
679 
680         for (names = iterm_names; names->type; names++) {
681                 if (names->type == iterm->type) {
682                         strcpy(name, names->name);
683                         return strlen(names->name);
684                 }
685         }
686 
687         return 0;
688 }
689 
690 /*
691  * parse the source unit recursively until it reaches to a terminal
692  * or a branched unit.
693  */
694 static int check_input_term(struct mixer_build *state, int id,
695                             struct usb_audio_term *term)
696 {
697         int err;
698         void *p1;
699 
700         memset(term, 0, sizeof(*term));
701         while ((p1 = find_audio_control_unit(state, id)) != NULL) {
702                 unsigned char *hdr = p1;
703                 term->id = id;
704                 switch (hdr[2]) {
705                 case UAC_INPUT_TERMINAL:
706                         if (state->mixer->protocol == UAC_VERSION_1) {
707                                 struct uac_input_terminal_descriptor *d = p1;
708                                 term->type = le16_to_cpu(d->wTerminalType);
709                                 term->channels = d->bNrChannels;
710                                 term->chconfig = le16_to_cpu(d->wChannelConfig);
711                                 term->name = d->iTerminal;
712                         } else { /* UAC_VERSION_2 */
713                                 struct uac2_input_terminal_descriptor *d = p1;
714                                 term->type = le16_to_cpu(d->wTerminalType);
715                                 term->channels = d->bNrChannels;
716                                 term->chconfig = le32_to_cpu(d->bmChannelConfig);
717                                 term->name = d->iTerminal;
718 
719                                 /* call recursively to get the clock selectors */
720                                 err = check_input_term(state, d->bCSourceID, term);
721                                 if (err < 0)
722                                         return err;
723                         }
724                         return 0;
725                 case UAC_FEATURE_UNIT: {
726                         /* the header is the same for v1 and v2 */
727                         struct uac_feature_unit_descriptor *d = p1;
728                         id = d->bSourceID;
729                         break; /* continue to parse */
730                 }
731                 case UAC_MIXER_UNIT: {
732                         struct uac_mixer_unit_descriptor *d = p1;
733                         term->type = d->bDescriptorSubtype << 16; /* virtual type */
734                         term->channels = uac_mixer_unit_bNrChannels(d);
735                         term->chconfig = uac_mixer_unit_wChannelConfig(d, state->mixer->protocol);
736                         term->name = uac_mixer_unit_iMixer(d);
737                         return 0;
738                 }
739                 case UAC_SELECTOR_UNIT:
740                 case UAC2_CLOCK_SELECTOR: {
741                         struct uac_selector_unit_descriptor *d = p1;
742                         /* call recursively to retrieve the channel info */
743                         err = check_input_term(state, d->baSourceID[0], term);
744                         if (err < 0)
745                                 return err;
746                         term->type = d->bDescriptorSubtype << 16; /* virtual type */
747                         term->id = id;
748                         term->name = uac_selector_unit_iSelector(d);
749                         return 0;
750                 }
751                 case UAC1_PROCESSING_UNIT:
752                 case UAC1_EXTENSION_UNIT:
753                 /* UAC2_PROCESSING_UNIT_V2 */
754                 /* UAC2_EFFECT_UNIT */
755                 case UAC2_EXTENSION_UNIT_V2: {
756                         struct uac_processing_unit_descriptor *d = p1;
757 
758                         if (state->mixer->protocol == UAC_VERSION_2 &&
759                                 hdr[2] == UAC2_EFFECT_UNIT) {
760                                 /* UAC2/UAC1 unit IDs overlap here in an
761                                  * uncompatible way. Ignore this unit for now.
762                                  */
763                                 return 0;
764                         }
765 
766                         if (d->bNrInPins) {
767                                 id = d->baSourceID[0];
768                                 break; /* continue to parse */
769                         }
770                         term->type = d->bDescriptorSubtype << 16; /* virtual type */
771                         term->channels = uac_processing_unit_bNrChannels(d);
772                         term->chconfig = uac_processing_unit_wChannelConfig(d, state->mixer->protocol);
773                         term->name = uac_processing_unit_iProcessing(d, state->mixer->protocol);
774                         return 0;
775                 }
776                 case UAC2_CLOCK_SOURCE: {
777                         struct uac_clock_source_descriptor *d = p1;
778                         term->type = d->bDescriptorSubtype << 16; /* virtual type */
779                         term->id = id;
780                         term->name = d->iClockSource;
781                         return 0;
782                 }
783                 default:
784                         return -ENODEV;
785                 }
786         }
787         return -ENODEV;
788 }
789 
790 /*
791  * Feature Unit
792  */
793 
794 /* feature unit control information */
795 struct usb_feature_control_info {
796         const char *name;
797         unsigned int type;      /* control type (mute, volume, etc.) */
798 };
799 
800 static struct usb_feature_control_info audio_feature_info[] = {
801         { "Mute",                       USB_MIXER_INV_BOOLEAN },
802         { "Volume",                     USB_MIXER_S16 },
803         { "Tone Control - Bass",        USB_MIXER_S8 },
804         { "Tone Control - Mid",         USB_MIXER_S8 },
805         { "Tone Control - Treble",      USB_MIXER_S8 },
806         { "Graphic Equalizer",          USB_MIXER_S8 }, /* FIXME: not implemeted yet */
807         { "Auto Gain Control",          USB_MIXER_BOOLEAN },
808         { "Delay Control",              USB_MIXER_U16 },
809         { "Bass Boost",                 USB_MIXER_BOOLEAN },
810         { "Loudness",                   USB_MIXER_BOOLEAN },
811         /* UAC2 specific */
812         { "Input Gain Control",         USB_MIXER_U16 },
813         { "Input Gain Pad Control",     USB_MIXER_BOOLEAN },
814         { "Phase Inverter Control",     USB_MIXER_BOOLEAN },
815 };
816 
817 /* private_free callback */
818 static void usb_mixer_elem_free(struct snd_kcontrol *kctl)
819 {
820         kfree(kctl->private_data);
821         kctl->private_data = NULL;
822 }
823 
824 /*
825  * interface to ALSA control for feature/mixer units
826  */
827 
828 /* volume control quirks */
829 static void volume_control_quirks(struct usb_mixer_elem_info *cval,
830                                   struct snd_kcontrol *kctl)
831 {
832         struct snd_usb_audio *chip = cval->mixer->chip;
833         switch (chip->usb_id) {
834         case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
835         case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
836                 if (strcmp(kctl->id.name, "Effect Duration") == 0) {
837                         cval->min = 0x0000;
838                         cval->max = 0xffff;
839                         cval->res = 0x00e6;
840                         break;
841                 }
842                 if (strcmp(kctl->id.name, "Effect Volume") == 0 ||
843                     strcmp(kctl->id.name, "Effect Feedback Volume") == 0) {
844                         cval->min = 0x00;
845                         cval->max = 0xff;
846                         break;
847                 }
848                 if (strstr(kctl->id.name, "Effect Return") != NULL) {
849                         cval->min = 0xb706;
850                         cval->max = 0xff7b;
851                         cval->res = 0x0073;
852                         break;
853                 }
854                 if ((strstr(kctl->id.name, "Playback Volume") != NULL) ||
855                         (strstr(kctl->id.name, "Effect Send") != NULL)) {
856                         cval->min = 0xb5fb; /* -73 dB = 0xb6ff */
857                         cval->max = 0xfcfe;
858                         cval->res = 0x0073;
859                 }
860                 break;
861 
862         case USB_ID(0x0763, 0x2081): /* M-Audio Fast Track Ultra 8R */
863         case USB_ID(0x0763, 0x2080): /* M-Audio Fast Track Ultra */
864                 if (strcmp(kctl->id.name, "Effect Duration") == 0) {
865                         usb_audio_info(chip,
866                                        "set quirk for FTU Effect Duration\n");
867                         cval->min = 0x0000;
868                         cval->max = 0x7f00;
869                         cval->res = 0x0100;
870                         break;
871                 }
872                 if (strcmp(kctl->id.name, "Effect Volume") == 0 ||
873                     strcmp(kctl->id.name, "Effect Feedback Volume") == 0) {
874                         usb_audio_info(chip,
875                                        "set quirks for FTU Effect Feedback/Volume\n");
876                         cval->min = 0x00;
877                         cval->max = 0x7f;
878                         break;
879                 }
880                 break;
881 
882         case USB_ID(0x0471, 0x0101):
883         case USB_ID(0x0471, 0x0104):
884         case USB_ID(0x0471, 0x0105):
885         case USB_ID(0x0672, 0x1041):
886         /* quirk for UDA1321/N101.
887          * note that detection between firmware 2.1.1.7 (N101)
888          * and later 2.1.1.21 is not very clear from datasheets.
889          * I hope that the min value is -15360 for newer firmware --jk
890          */
891                 if (!strcmp(kctl->id.name, "PCM Playback Volume") &&
892                     cval->min == -15616) {
893                         usb_audio_info(chip,
894                                  "set volume quirk for UDA1321/N101 chip\n");
895                         cval->max = -256;
896                 }
897                 break;
898 
899         case USB_ID(0x046d, 0x09a4):
900                 if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
901                         usb_audio_info(chip,
902                                 "set volume quirk for QuickCam E3500\n");
903                         cval->min = 6080;
904                         cval->max = 8768;
905                         cval->res = 192;
906                 }
907                 break;
908 
909         case USB_ID(0x046d, 0x0807): /* Logitech Webcam C500 */
910         case USB_ID(0x046d, 0x0808):
911         case USB_ID(0x046d, 0x0809):
912         case USB_ID(0x046d, 0x081b): /* HD Webcam c310 */
913         case USB_ID(0x046d, 0x081d): /* HD Webcam c510 */
914         case USB_ID(0x046d, 0x0825): /* HD Webcam c270 */
915         case USB_ID(0x046d, 0x0826): /* HD Webcam c525 */
916         case USB_ID(0x046d, 0x0991):
917         /* Most audio usb devices lie about volume resolution.
918          * Most Logitech webcams have res = 384.
919          * Proboly there is some logitech magic behind this number --fishor
920          */
921                 if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
922                         usb_audio_info(chip,
923                                 "set resolution quirk: cval->res = 384\n");
924                         cval->res = 384;
925                 }
926                 break;
927         }
928 }
929 
930 /*
931  * retrieve the minimum and maximum values for the specified control
932  */
933 static int get_min_max_with_quirks(struct usb_mixer_elem_info *cval,
934                                    int default_min, struct snd_kcontrol *kctl)
935 {
936         /* for failsafe */
937         cval->min = default_min;
938         cval->max = cval->min + 1;
939         cval->res = 1;
940         cval->dBmin = cval->dBmax = 0;
941 
942         if (cval->val_type == USB_MIXER_BOOLEAN ||
943             cval->val_type == USB_MIXER_INV_BOOLEAN) {
944                 cval->initialized = 1;
945         } else {
946                 int minchn = 0;
947                 if (cval->cmask) {
948                         int i;
949                         for (i = 0; i < MAX_CHANNELS; i++)
950                                 if (cval->cmask & (1 << i)) {
951                                         minchn = i + 1;
952                                         break;
953                                 }
954                 }
955                 if (get_ctl_value(cval, UAC_GET_MAX, (cval->control << 8) | minchn, &cval->max) < 0 ||
956                     get_ctl_value(cval, UAC_GET_MIN, (cval->control << 8) | minchn, &cval->min) < 0) {
957                         usb_audio_err(cval->mixer->chip,
958                                       "%d:%d: cannot get min/max values for control %d (id %d)\n",
959                                    cval->id, snd_usb_ctrl_intf(cval->mixer->chip),
960                                                                cval->control, cval->id);
961                         return -EINVAL;
962                 }
963                 if (get_ctl_value(cval, UAC_GET_RES,
964                                   (cval->control << 8) | minchn,
965                                   &cval->res) < 0) {
966                         cval->res = 1;
967                 } else {
968                         int last_valid_res = cval->res;
969 
970                         while (cval->res > 1) {
971                                 if (snd_usb_mixer_set_ctl_value(cval, UAC_SET_RES,
972                                                                 (cval->control << 8) | minchn,
973                                                                 cval->res / 2) < 0)
974                                         break;
975                                 cval->res /= 2;
976                         }
977                         if (get_ctl_value(cval, UAC_GET_RES,
978                                           (cval->control << 8) | minchn, &cval->res) < 0)
979                                 cval->res = last_valid_res;
980                 }
981                 if (cval->res == 0)
982                         cval->res = 1;
983 
984                 /* Additional checks for the proper resolution
985                  *
986                  * Some devices report smaller resolutions than actually
987                  * reacting.  They don't return errors but simply clip
988                  * to the lower aligned value.
989                  */
990                 if (cval->min + cval->res < cval->max) {
991                         int last_valid_res = cval->res;
992                         int saved, test, check;
993                         get_cur_mix_raw(cval, minchn, &saved);
994                         for (;;) {
995                                 test = saved;
996                                 if (test < cval->max)
997                                         test += cval->res;
998                                 else
999                                         test -= cval->res;
1000                                 if (test < cval->min || test > cval->max ||
1001                                     set_cur_mix_value(cval, minchn, 0, test) ||
1002                                     get_cur_mix_raw(cval, minchn, &check)) {
1003                                         cval->res = last_valid_res;
1004                                         break;
1005                                 }
1006                                 if (test == check)
1007                                         break;
1008                                 cval->res *= 2;
1009                         }
1010                         set_cur_mix_value(cval, minchn, 0, saved);
1011                 }
1012 
1013                 cval->initialized = 1;
1014         }
1015 
1016         if (kctl)
1017                 volume_control_quirks(cval, kctl);
1018 
1019         /* USB descriptions contain the dB scale in 1/256 dB unit
1020          * while ALSA TLV contains in 1/100 dB unit
1021          */
1022         cval->dBmin = (convert_signed_value(cval, cval->min) * 100) / 256;
1023         cval->dBmax = (convert_signed_value(cval, cval->max) * 100) / 256;
1024         if (cval->dBmin > cval->dBmax) {
1025                 /* something is wrong; assume it's either from/to 0dB */
1026                 if (cval->dBmin < 0)
1027                         cval->dBmax = 0;
1028                 else if (cval->dBmin > 0)
1029                         cval->dBmin = 0;
1030                 if (cval->dBmin > cval->dBmax) {
1031                         /* totally crap, return an error */
1032                         return -EINVAL;
1033                 }
1034         }
1035 
1036         return 0;
1037 }
1038 
1039 #define get_min_max(cval, def)  get_min_max_with_quirks(cval, def, NULL)
1040 
1041 /* get a feature/mixer unit info */
1042 static int mixer_ctl_feature_info(struct snd_kcontrol *kcontrol,
1043                                   struct snd_ctl_elem_info *uinfo)
1044 {
1045         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1046 
1047         if (cval->val_type == USB_MIXER_BOOLEAN ||
1048             cval->val_type == USB_MIXER_INV_BOOLEAN)
1049                 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1050         else
1051                 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
1052         uinfo->count = cval->channels;
1053         if (cval->val_type == USB_MIXER_BOOLEAN ||
1054             cval->val_type == USB_MIXER_INV_BOOLEAN) {
1055                 uinfo->value.integer.min = 0;
1056                 uinfo->value.integer.max = 1;
1057         } else {
1058                 if (!cval->initialized) {
1059                         get_min_max_with_quirks(cval, 0, kcontrol);
1060                         if (cval->initialized && cval->dBmin >= cval->dBmax) {
1061                                 kcontrol->vd[0].access &= 
1062                                         ~(SNDRV_CTL_ELEM_ACCESS_TLV_READ |
1063                                           SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK);
1064                                 snd_ctl_notify(cval->mixer->chip->card,
1065                                                SNDRV_CTL_EVENT_MASK_INFO,
1066                                                &kcontrol->id);
1067                         }
1068                 }
1069                 uinfo->value.integer.min = 0;
1070                 uinfo->value.integer.max =
1071                         (cval->max - cval->min + cval->res - 1) / cval->res;
1072         }
1073         return 0;
1074 }
1075 
1076 /* get the current value from feature/mixer unit */
1077 static int mixer_ctl_feature_get(struct snd_kcontrol *kcontrol,
1078                                  struct snd_ctl_elem_value *ucontrol)
1079 {
1080         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1081         int c, cnt, val, err;
1082 
1083         ucontrol->value.integer.value[0] = cval->min;
1084         if (cval->cmask) {
1085                 cnt = 0;
1086                 for (c = 0; c < MAX_CHANNELS; c++) {
1087                         if (!(cval->cmask & (1 << c)))
1088                                 continue;
1089                         err = get_cur_mix_value(cval, c + 1, cnt, &val);
1090                         if (err < 0)
1091                                 return cval->mixer->ignore_ctl_error ? 0 : err;
1092                         val = get_relative_value(cval, val);
1093                         ucontrol->value.integer.value[cnt] = val;
1094                         cnt++;
1095                 }
1096                 return 0;
1097         } else {
1098                 /* master channel */
1099                 err = get_cur_mix_value(cval, 0, 0, &val);
1100                 if (err < 0)
1101                         return cval->mixer->ignore_ctl_error ? 0 : err;
1102                 val = get_relative_value(cval, val);
1103                 ucontrol->value.integer.value[0] = val;
1104         }
1105         return 0;
1106 }
1107 
1108 /* put the current value to feature/mixer unit */
1109 static int mixer_ctl_feature_put(struct snd_kcontrol *kcontrol,
1110                                  struct snd_ctl_elem_value *ucontrol)
1111 {
1112         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1113         int c, cnt, val, oval, err;
1114         int changed = 0;
1115 
1116         if (cval->cmask) {
1117                 cnt = 0;
1118                 for (c = 0; c < MAX_CHANNELS; c++) {
1119                         if (!(cval->cmask & (1 << c)))
1120                                 continue;
1121                         err = get_cur_mix_value(cval, c + 1, cnt, &oval);
1122                         if (err < 0)
1123                                 return cval->mixer->ignore_ctl_error ? 0 : err;
1124                         val = ucontrol->value.integer.value[cnt];
1125                         val = get_abs_value(cval, val);
1126                         if (oval != val) {
1127                                 set_cur_mix_value(cval, c + 1, cnt, val);
1128                                 changed = 1;
1129                         }
1130                         cnt++;
1131                 }
1132         } else {
1133                 /* master channel */
1134                 err = get_cur_mix_value(cval, 0, 0, &oval);
1135                 if (err < 0)
1136                         return cval->mixer->ignore_ctl_error ? 0 : err;
1137                 val = ucontrol->value.integer.value[0];
1138                 val = get_abs_value(cval, val);
1139                 if (val != oval) {
1140                         set_cur_mix_value(cval, 0, 0, val);
1141                         changed = 1;
1142                 }
1143         }
1144         return changed;
1145 }
1146 
1147 static struct snd_kcontrol_new usb_feature_unit_ctl = {
1148         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1149         .name = "", /* will be filled later manually */
1150         .info = mixer_ctl_feature_info,
1151         .get = mixer_ctl_feature_get,
1152         .put = mixer_ctl_feature_put,
1153 };
1154 
1155 /* the read-only variant */
1156 static struct snd_kcontrol_new usb_feature_unit_ctl_ro = {
1157         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1158         .name = "", /* will be filled later manually */
1159         .info = mixer_ctl_feature_info,
1160         .get = mixer_ctl_feature_get,
1161         .put = NULL,
1162 };
1163 
1164 /*
1165  * This symbol is exported in order to allow the mixer quirks to
1166  * hook up to the standard feature unit control mechanism
1167  */
1168 struct snd_kcontrol_new *snd_usb_feature_unit_ctl = &usb_feature_unit_ctl;
1169 
1170 /*
1171  * build a feature control
1172  */
1173 static size_t append_ctl_name(struct snd_kcontrol *kctl, const char *str)
1174 {
1175         return strlcat(kctl->id.name, str, sizeof(kctl->id.name));
1176 }
1177 
1178 /*
1179  * A lot of headsets/headphones have a "Speaker" mixer. Make sure we
1180  * rename it to "Headphone". We determine if something is a headphone
1181  * similar to how udev determines form factor.
1182  */
1183 static void check_no_speaker_on_headset(struct snd_kcontrol *kctl,
1184                                         struct snd_card *card)
1185 {
1186         const char *names_to_check[] = {
1187                 "Headset", "headset", "Headphone", "headphone", NULL};
1188         const char **s;
1189         bool found = false;
1190 
1191         if (strcmp("Speaker", kctl->id.name))
1192                 return;
1193 
1194         for (s = names_to_check; *s; s++)
1195                 if (strstr(card->shortname, *s)) {
1196                         found = true;
1197                         break;
1198                 }
1199 
1200         if (!found)
1201                 return;
1202 
1203         strlcpy(kctl->id.name, "Headphone", sizeof(kctl->id.name));
1204 }
1205 
1206 static void build_feature_ctl(struct mixer_build *state, void *raw_desc,
1207                               unsigned int ctl_mask, int control,
1208                               struct usb_audio_term *iterm, int unitid,
1209                               int readonly_mask)
1210 {
1211         struct uac_feature_unit_descriptor *desc = raw_desc;
1212         unsigned int len = 0;
1213         int mapped_name = 0;
1214         int nameid = uac_feature_unit_iFeature(desc);
1215         struct snd_kcontrol *kctl;
1216         struct usb_mixer_elem_info *cval;
1217         const struct usbmix_name_map *map;
1218         unsigned int range;
1219 
1220         control++; /* change from zero-based to 1-based value */
1221 
1222         if (control == UAC_FU_GRAPHIC_EQUALIZER) {
1223                 /* FIXME: not supported yet */
1224                 return;
1225         }
1226 
1227         map = find_map(state, unitid, control);
1228         if (check_ignored_ctl(map))
1229                 return;
1230 
1231         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1232         if (!cval)
1233                 return;
1234         cval->mixer = state->mixer;
1235         cval->id = unitid;
1236         cval->control = control;
1237         cval->cmask = ctl_mask;
1238         cval->val_type = audio_feature_info[control-1].type;
1239         if (ctl_mask == 0) {
1240                 cval->channels = 1;     /* master channel */
1241                 cval->master_readonly = readonly_mask;
1242         } else {
1243                 int i, c = 0;
1244                 for (i = 0; i < 16; i++)
1245                         if (ctl_mask & (1 << i))
1246                                 c++;
1247                 cval->channels = c;
1248                 cval->ch_readonly = readonly_mask;
1249         }
1250 
1251         /*
1252          * If all channels in the mask are marked read-only, make the control
1253          * read-only. set_cur_mix_value() will check the mask again and won't
1254          * issue write commands to read-only channels.
1255          */
1256         if (cval->channels == readonly_mask)
1257                 kctl = snd_ctl_new1(&usb_feature_unit_ctl_ro, cval);
1258         else
1259                 kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
1260 
1261         if (!kctl) {
1262                 usb_audio_err(state->chip, "cannot malloc kcontrol\n");
1263                 kfree(cval);
1264                 return;
1265         }
1266         kctl->private_free = usb_mixer_elem_free;
1267 
1268         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
1269         mapped_name = len != 0;
1270         if (!len && nameid)
1271                 len = snd_usb_copy_string_desc(state, nameid,
1272                                 kctl->id.name, sizeof(kctl->id.name));
1273 
1274         switch (control) {
1275         case UAC_FU_MUTE:
1276         case UAC_FU_VOLUME:
1277                 /*
1278                  * determine the control name.  the rule is:
1279                  * - if a name id is given in descriptor, use it.
1280                  * - if the connected input can be determined, then use the name
1281                  *   of terminal type.
1282                  * - if the connected output can be determined, use it.
1283                  * - otherwise, anonymous name.
1284                  */
1285                 if (!len) {
1286                         len = get_term_name(state, iterm, kctl->id.name,
1287                                             sizeof(kctl->id.name), 1);
1288                         if (!len)
1289                                 len = get_term_name(state, &state->oterm,
1290                                                     kctl->id.name,
1291                                                     sizeof(kctl->id.name), 1);
1292                         if (!len)
1293                                 len = snprintf(kctl->id.name,
1294                                                sizeof(kctl->id.name),
1295                                                "Feature %d", unitid);
1296                 }
1297 
1298                 if (!mapped_name)
1299                         check_no_speaker_on_headset(kctl, state->mixer->chip->card);
1300 
1301                 /*
1302                  * determine the stream direction:
1303                  * if the connected output is USB stream, then it's likely a
1304                  * capture stream.  otherwise it should be playback (hopefully :)
1305                  */
1306                 if (!mapped_name && !(state->oterm.type >> 16)) {
1307                         if ((state->oterm.type & 0xff00) == 0x0100)
1308                                 len = append_ctl_name(kctl, " Capture");
1309                         else
1310                                 len = append_ctl_name(kctl, " Playback");
1311                 }
1312                 append_ctl_name(kctl, control == UAC_FU_MUTE ?
1313                                 " Switch" : " Volume");
1314                 break;
1315         default:
1316                 if (!len)
1317                         strlcpy(kctl->id.name, audio_feature_info[control-1].name,
1318                                 sizeof(kctl->id.name));
1319                 break;
1320         }
1321 
1322         /* get min/max values */
1323         get_min_max_with_quirks(cval, 0, kctl);
1324 
1325         if (control == UAC_FU_VOLUME) {
1326                 check_mapped_dB(map, cval);
1327                 if (cval->dBmin < cval->dBmax || !cval->initialized) {
1328                         kctl->tlv.c = snd_usb_mixer_vol_tlv;
1329                         kctl->vd[0].access |=
1330                                 SNDRV_CTL_ELEM_ACCESS_TLV_READ |
1331                                 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
1332                 }
1333         }
1334 
1335         range = (cval->max - cval->min) / cval->res;
1336         /*
1337          * Are there devices with volume range more than 255? I use a bit more
1338          * to be sure. 384 is a resolution magic number found on Logitech
1339          * devices. It will definitively catch all buggy Logitech devices.
1340          */
1341         if (range > 384) {
1342                 usb_audio_warn(state->chip,
1343                                "Warning! Unlikely big volume range (=%u), cval->res is probably wrong.",
1344                                range);
1345                 usb_audio_warn(state->chip,
1346                                "[%d] FU [%s] ch = %d, val = %d/%d/%d",
1347                                cval->id, kctl->id.name, cval->channels,
1348                                cval->min, cval->max, cval->res);
1349         }
1350 
1351         usb_audio_dbg(state->chip, "[%d] FU [%s] ch = %d, val = %d/%d/%d\n",
1352                       cval->id, kctl->id.name, cval->channels,
1353                       cval->min, cval->max, cval->res);
1354         snd_usb_mixer_add_control(state->mixer, kctl);
1355 }
1356 
1357 /*
1358  * parse a feature unit
1359  *
1360  * most of controls are defined here.
1361  */
1362 static int parse_audio_feature_unit(struct mixer_build *state, int unitid,
1363                                     void *_ftr)
1364 {
1365         int channels, i, j;
1366         struct usb_audio_term iterm;
1367         unsigned int master_bits, first_ch_bits;
1368         int err, csize;
1369         struct uac_feature_unit_descriptor *hdr = _ftr;
1370         __u8 *bmaControls;
1371 
1372         if (state->mixer->protocol == UAC_VERSION_1) {
1373                 csize = hdr->bControlSize;
1374                 if (!csize) {
1375                         usb_audio_dbg(state->chip,
1376                                       "unit %u: invalid bControlSize == 0\n",
1377                                       unitid);
1378                         return -EINVAL;
1379                 }
1380                 channels = (hdr->bLength - 7) / csize - 1;
1381                 bmaControls = hdr->bmaControls;
1382                 if (hdr->bLength < 7 + csize) {
1383                         usb_audio_err(state->chip,
1384                                       "unit %u: invalid UAC_FEATURE_UNIT descriptor\n",
1385                                       unitid);
1386                         return -EINVAL;
1387                 }
1388         } else {
1389                 struct uac2_feature_unit_descriptor *ftr = _ftr;
1390                 csize = 4;
1391                 channels = (hdr->bLength - 6) / 4 - 1;
1392                 bmaControls = ftr->bmaControls;
1393                 if (hdr->bLength < 6 + csize) {
1394                         usb_audio_err(state->chip,
1395                                       "unit %u: invalid UAC_FEATURE_UNIT descriptor\n",
1396                                       unitid);
1397                         return -EINVAL;
1398                 }
1399         }
1400 
1401         /* parse the source unit */
1402         if ((err = parse_audio_unit(state, hdr->bSourceID)) < 0)
1403                 return err;
1404 
1405         /* determine the input source type and name */
1406         err = check_input_term(state, hdr->bSourceID, &iterm);
1407         if (err < 0)
1408                 return err;
1409 
1410         master_bits = snd_usb_combine_bytes(bmaControls, csize);
1411         /* master configuration quirks */
1412         switch (state->chip->usb_id) {
1413         case USB_ID(0x08bb, 0x2702):
1414                 usb_audio_info(state->chip,
1415                                "usbmixer: master volume quirk for PCM2702 chip\n");
1416                 /* disable non-functional volume control */
1417                 master_bits &= ~UAC_CONTROL_BIT(UAC_FU_VOLUME);
1418                 break;
1419         case USB_ID(0x1130, 0xf211):
1420                 usb_audio_info(state->chip,
1421                                "usbmixer: volume control quirk for Tenx TP6911 Audio Headset\n");
1422                 /* disable non-functional volume control */
1423                 channels = 0;
1424                 break;
1425 
1426         }
1427         if (channels > 0)
1428                 first_ch_bits = snd_usb_combine_bytes(bmaControls + csize, csize);
1429         else
1430                 first_ch_bits = 0;
1431 
1432         if (state->mixer->protocol == UAC_VERSION_1) {
1433                 /* check all control types */
1434                 for (i = 0; i < 10; i++) {
1435                         unsigned int ch_bits = 0;
1436                         for (j = 0; j < channels; j++) {
1437                                 unsigned int mask;
1438 
1439                                 mask = snd_usb_combine_bytes(bmaControls +
1440                                                              csize * (j+1), csize);
1441                                 if (mask & (1 << i))
1442                                         ch_bits |= (1 << j);
1443                         }
1444                         /* audio class v1 controls are never read-only */
1445 
1446                         /*
1447                          * The first channel must be set
1448                          * (for ease of programming).
1449                          */
1450                         if (ch_bits & 1)
1451                                 build_feature_ctl(state, _ftr, ch_bits, i,
1452                                                   &iterm, unitid, 0);
1453                         if (master_bits & (1 << i))
1454                                 build_feature_ctl(state, _ftr, 0, i, &iterm,
1455                                                   unitid, 0);
1456                 }
1457         } else { /* UAC_VERSION_2 */
1458                 for (i = 0; i < ARRAY_SIZE(audio_feature_info); i++) {
1459                         unsigned int ch_bits = 0;
1460                         unsigned int ch_read_only = 0;
1461 
1462                         for (j = 0; j < channels; j++) {
1463                                 unsigned int mask;
1464 
1465                                 mask = snd_usb_combine_bytes(bmaControls +
1466                                                              csize * (j+1), csize);
1467                                 if (uac2_control_is_readable(mask, i)) {
1468                                         ch_bits |= (1 << j);
1469                                         if (!uac2_control_is_writeable(mask, i))
1470                                                 ch_read_only |= (1 << j);
1471                                 }
1472                         }
1473 
1474                         /*
1475                          * NOTE: build_feature_ctl() will mark the control
1476                          * read-only if all channels are marked read-only in
1477                          * the descriptors. Otherwise, the control will be
1478                          * reported as writeable, but the driver will not
1479                          * actually issue a write command for read-only
1480                          * channels.
1481                          */
1482 
1483                         /*
1484                          * The first channel must be set
1485                          * (for ease of programming).
1486                          */
1487                         if (ch_bits & 1)
1488                                 build_feature_ctl(state, _ftr, ch_bits, i,
1489                                                   &iterm, unitid, ch_read_only);
1490                         if (uac2_control_is_readable(master_bits, i))
1491                                 build_feature_ctl(state, _ftr, 0, i, &iterm, unitid,
1492                                                   !uac2_control_is_writeable(master_bits, i));
1493                 }
1494         }
1495 
1496         return 0;
1497 }
1498 
1499 /*
1500  * Mixer Unit
1501  */
1502 
1503 /*
1504  * build a mixer unit control
1505  *
1506  * the callbacks are identical with feature unit.
1507  * input channel number (zero based) is given in control field instead.
1508  */
1509 static void build_mixer_unit_ctl(struct mixer_build *state,
1510                                  struct uac_mixer_unit_descriptor *desc,
1511                                  int in_pin, int in_ch, int unitid,
1512                                  struct usb_audio_term *iterm)
1513 {
1514         struct usb_mixer_elem_info *cval;
1515         unsigned int num_outs = uac_mixer_unit_bNrChannels(desc);
1516         unsigned int i, len;
1517         struct snd_kcontrol *kctl;
1518         const struct usbmix_name_map *map;
1519 
1520         map = find_map(state, unitid, 0);
1521         if (check_ignored_ctl(map))
1522                 return;
1523 
1524         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1525         if (!cval)
1526                 return;
1527 
1528         cval->mixer = state->mixer;
1529         cval->id = unitid;
1530         cval->control = in_ch + 1; /* based on 1 */
1531         cval->val_type = USB_MIXER_S16;
1532         for (i = 0; i < num_outs; i++) {
1533                 __u8 *c = uac_mixer_unit_bmControls(desc, state->mixer->protocol);
1534 
1535                 if (check_matrix_bitmap(c, in_ch, i, num_outs)) {
1536                         cval->cmask |= (1 << i);
1537                         cval->channels++;
1538                 }
1539         }
1540 
1541         /* get min/max values */
1542         get_min_max(cval, 0);
1543 
1544         kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
1545         if (!kctl) {
1546                 usb_audio_err(state->chip, "cannot malloc kcontrol\n");
1547                 kfree(cval);
1548                 return;
1549         }
1550         kctl->private_free = usb_mixer_elem_free;
1551 
1552         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
1553         if (!len)
1554                 len = get_term_name(state, iterm, kctl->id.name,
1555                                     sizeof(kctl->id.name), 0);
1556         if (!len)
1557                 len = sprintf(kctl->id.name, "Mixer Source %d", in_ch + 1);
1558         append_ctl_name(kctl, " Volume");
1559 
1560         usb_audio_dbg(state->chip, "[%d] MU [%s] ch = %d, val = %d/%d\n",
1561                     cval->id, kctl->id.name, cval->channels, cval->min, cval->max);
1562         snd_usb_mixer_add_control(state->mixer, kctl);
1563 }
1564 
1565 /*
1566  * parse a mixer unit
1567  */
1568 static int parse_audio_mixer_unit(struct mixer_build *state, int unitid,
1569                                   void *raw_desc)
1570 {
1571         struct uac_mixer_unit_descriptor *desc = raw_desc;
1572         struct usb_audio_term iterm;
1573         int input_pins, num_ins, num_outs;
1574         int pin, ich, err;
1575 
1576         if (desc->bLength < 11 || !(input_pins = desc->bNrInPins) ||
1577             !(num_outs = uac_mixer_unit_bNrChannels(desc))) {
1578                 usb_audio_err(state->chip,
1579                               "invalid MIXER UNIT descriptor %d\n",
1580                               unitid);
1581                 return -EINVAL;
1582         }
1583         /* no bmControls field (e.g. Maya44) -> ignore */
1584         if (desc->bLength <= 10 + input_pins) {
1585                 usb_audio_dbg(state->chip, "MU %d has no bmControls field\n",
1586                               unitid);
1587                 return 0;
1588         }
1589 
1590         num_ins = 0;
1591         ich = 0;
1592         for (pin = 0; pin < input_pins; pin++) {
1593                 err = parse_audio_unit(state, desc->baSourceID[pin]);
1594                 if (err < 0)
1595                         continue;
1596                 err = check_input_term(state, desc->baSourceID[pin], &iterm);
1597                 if (err < 0)
1598                         return err;
1599                 num_ins += iterm.channels;
1600                 for (; ich < num_ins; ich++) {
1601                         int och, ich_has_controls = 0;
1602 
1603                         for (och = 0; och < num_outs; och++) {
1604                                 __u8 *c = uac_mixer_unit_bmControls(desc,
1605                                                 state->mixer->protocol);
1606 
1607                                 if (check_matrix_bitmap(c, ich, och, num_outs)) {
1608                                         ich_has_controls = 1;
1609                                         break;
1610                                 }
1611                         }
1612                         if (ich_has_controls)
1613                                 build_mixer_unit_ctl(state, desc, pin, ich,
1614                                                      unitid, &iterm);
1615                 }
1616         }
1617         return 0;
1618 }
1619 
1620 /*
1621  * Processing Unit / Extension Unit
1622  */
1623 
1624 /* get callback for processing/extension unit */
1625 static int mixer_ctl_procunit_get(struct snd_kcontrol *kcontrol,
1626                                   struct snd_ctl_elem_value *ucontrol)
1627 {
1628         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1629         int err, val;
1630 
1631         err = get_cur_ctl_value(cval, cval->control << 8, &val);
1632         if (err < 0 && cval->mixer->ignore_ctl_error) {
1633                 ucontrol->value.integer.value[0] = cval->min;
1634                 return 0;
1635         }
1636         if (err < 0)
1637                 return err;
1638         val = get_relative_value(cval, val);
1639         ucontrol->value.integer.value[0] = val;
1640         return 0;
1641 }
1642 
1643 /* put callback for processing/extension unit */
1644 static int mixer_ctl_procunit_put(struct snd_kcontrol *kcontrol,
1645                                   struct snd_ctl_elem_value *ucontrol)
1646 {
1647         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1648         int val, oval, err;
1649 
1650         err = get_cur_ctl_value(cval, cval->control << 8, &oval);
1651         if (err < 0) {
1652                 if (cval->mixer->ignore_ctl_error)
1653                         return 0;
1654                 return err;
1655         }
1656         val = ucontrol->value.integer.value[0];
1657         val = get_abs_value(cval, val);
1658         if (val != oval) {
1659                 set_cur_ctl_value(cval, cval->control << 8, val);
1660                 return 1;
1661         }
1662         return 0;
1663 }
1664 
1665 /* alsa control interface for processing/extension unit */
1666 static struct snd_kcontrol_new mixer_procunit_ctl = {
1667         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1668         .name = "", /* will be filled later */
1669         .info = mixer_ctl_feature_info,
1670         .get = mixer_ctl_procunit_get,
1671         .put = mixer_ctl_procunit_put,
1672 };
1673 
1674 /*
1675  * predefined data for processing units
1676  */
1677 struct procunit_value_info {
1678         int control;
1679         char *suffix;
1680         int val_type;
1681         int min_value;
1682 };
1683 
1684 struct procunit_info {
1685         int type;
1686         char *name;
1687         struct procunit_value_info *values;
1688 };
1689 
1690 static struct procunit_value_info updown_proc_info[] = {
1691         { UAC_UD_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1692         { UAC_UD_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
1693         { 0 }
1694 };
1695 static struct procunit_value_info prologic_proc_info[] = {
1696         { UAC_DP_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1697         { UAC_DP_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
1698         { 0 }
1699 };
1700 static struct procunit_value_info threed_enh_proc_info[] = {
1701         { UAC_3D_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1702         { UAC_3D_SPACE, "Spaciousness", USB_MIXER_U8 },
1703         { 0 }
1704 };
1705 static struct procunit_value_info reverb_proc_info[] = {
1706         { UAC_REVERB_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1707         { UAC_REVERB_LEVEL, "Level", USB_MIXER_U8 },
1708         { UAC_REVERB_TIME, "Time", USB_MIXER_U16 },
1709         { UAC_REVERB_FEEDBACK, "Feedback", USB_MIXER_U8 },
1710         { 0 }
1711 };
1712 static struct procunit_value_info chorus_proc_info[] = {
1713         { UAC_CHORUS_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1714         { UAC_CHORUS_LEVEL, "Level", USB_MIXER_U8 },
1715         { UAC_CHORUS_RATE, "Rate", USB_MIXER_U16 },
1716         { UAC_CHORUS_DEPTH, "Depth", USB_MIXER_U16 },
1717         { 0 }
1718 };
1719 static struct procunit_value_info dcr_proc_info[] = {
1720         { UAC_DCR_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1721         { UAC_DCR_RATE, "Ratio", USB_MIXER_U16 },
1722         { UAC_DCR_MAXAMPL, "Max Amp", USB_MIXER_S16 },
1723         { UAC_DCR_THRESHOLD, "Threshold", USB_MIXER_S16 },
1724         { UAC_DCR_ATTACK_TIME, "Attack Time", USB_MIXER_U16 },
1725         { UAC_DCR_RELEASE_TIME, "Release Time", USB_MIXER_U16 },
1726         { 0 }
1727 };
1728 
1729 static struct procunit_info procunits[] = {
1730         { UAC_PROCESS_UP_DOWNMIX, "Up Down", updown_proc_info },
1731         { UAC_PROCESS_DOLBY_PROLOGIC, "Dolby Prologic", prologic_proc_info },
1732         { UAC_PROCESS_STEREO_EXTENDER, "3D Stereo Extender", threed_enh_proc_info },
1733         { UAC_PROCESS_REVERB, "Reverb", reverb_proc_info },
1734         { UAC_PROCESS_CHORUS, "Chorus", chorus_proc_info },
1735         { UAC_PROCESS_DYN_RANGE_COMP, "DCR", dcr_proc_info },
1736         { 0 },
1737 };
1738 /*
1739  * predefined data for extension units
1740  */
1741 static struct procunit_value_info clock_rate_xu_info[] = {
1742         { USB_XU_CLOCK_RATE_SELECTOR, "Selector", USB_MIXER_U8, 0 },
1743         { 0 }
1744 };
1745 static struct procunit_value_info clock_source_xu_info[] = {
1746         { USB_XU_CLOCK_SOURCE_SELECTOR, "External", USB_MIXER_BOOLEAN },
1747         { 0 }
1748 };
1749 static struct procunit_value_info spdif_format_xu_info[] = {
1750         { USB_XU_DIGITAL_FORMAT_SELECTOR, "SPDIF/AC3", USB_MIXER_BOOLEAN },
1751         { 0 }
1752 };
1753 static struct procunit_value_info soft_limit_xu_info[] = {
1754         { USB_XU_SOFT_LIMIT_SELECTOR, " ", USB_MIXER_BOOLEAN },
1755         { 0 }
1756 };
1757 static struct procunit_info extunits[] = {
1758         { USB_XU_CLOCK_RATE, "Clock rate", clock_rate_xu_info },
1759         { USB_XU_CLOCK_SOURCE, "DigitalIn CLK source", clock_source_xu_info },
1760         { USB_XU_DIGITAL_IO_STATUS, "DigitalOut format:", spdif_format_xu_info },
1761         { USB_XU_DEVICE_OPTIONS, "AnalogueIn Soft Limit", soft_limit_xu_info },
1762         { 0 }
1763 };
1764 
1765 /*
1766  * build a processing/extension unit
1767  */
1768 static int build_audio_procunit(struct mixer_build *state, int unitid,
1769                                 void *raw_desc, struct procunit_info *list,
1770                                 char *name)
1771 {
1772         struct uac_processing_unit_descriptor *desc = raw_desc;
1773         int num_ins = desc->bNrInPins;
1774         struct usb_mixer_elem_info *cval;
1775         struct snd_kcontrol *kctl;
1776         int i, err, nameid, type, len;
1777         struct procunit_info *info;
1778         struct procunit_value_info *valinfo;
1779         const struct usbmix_name_map *map;
1780         static struct procunit_value_info default_value_info[] = {
1781                 { 0x01, "Switch", USB_MIXER_BOOLEAN },
1782                 { 0 }
1783         };
1784         static struct procunit_info default_info = {
1785                 0, NULL, default_value_info
1786         };
1787 
1788         if (desc->bLength < 13 || desc->bLength < 13 + num_ins ||
1789             desc->bLength < num_ins + uac_processing_unit_bControlSize(desc, state->mixer->protocol)) {
1790                 usb_audio_err(state->chip, "invalid %s descriptor (id %d)\n", name, unitid);
1791                 return -EINVAL;
1792         }
1793 
1794         for (i = 0; i < num_ins; i++) {
1795                 if ((err = parse_audio_unit(state, desc->baSourceID[i])) < 0)
1796                         return err;
1797         }
1798 
1799         type = le16_to_cpu(desc->wProcessType);
1800         for (info = list; info && info->type; info++)
1801                 if (info->type == type)
1802                         break;
1803         if (!info || !info->type)
1804                 info = &default_info;
1805 
1806         for (valinfo = info->values; valinfo->control; valinfo++) {
1807                 __u8 *controls = uac_processing_unit_bmControls(desc, state->mixer->protocol);
1808 
1809                 if (!(controls[valinfo->control / 8] & (1 << ((valinfo->control % 8) - 1))))
1810                         continue;
1811                 map = find_map(state, unitid, valinfo->control);
1812                 if (check_ignored_ctl(map))
1813                         continue;
1814                 cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1815                 if (!cval)
1816                         return -ENOMEM;
1817                 cval->mixer = state->mixer;
1818                 cval->id = unitid;
1819                 cval->control = valinfo->control;
1820                 cval->val_type = valinfo->val_type;
1821                 cval->channels = 1;
1822 
1823                 /* get min/max values */
1824                 if (type == UAC_PROCESS_UP_DOWNMIX && cval->control == UAC_UD_MODE_SELECT) {
1825                         __u8 *control_spec = uac_processing_unit_specific(desc, state->mixer->protocol);
1826                         /* FIXME: hard-coded */
1827                         cval->min = 1;
1828                         cval->max = control_spec[0];
1829                         cval->res = 1;
1830                         cval->initialized = 1;
1831                 } else {
1832                         if (type == USB_XU_CLOCK_RATE) {
1833                                 /*
1834                                  * E-Mu USB 0404/0202/TrackerPre/0204
1835                                  * samplerate control quirk
1836                                  */
1837                                 cval->min = 0;
1838                                 cval->max = 5;
1839                                 cval->res = 1;
1840                                 cval->initialized = 1;
1841                         } else
1842                                 get_min_max(cval, valinfo->min_value);
1843                 }
1844 
1845                 kctl = snd_ctl_new1(&mixer_procunit_ctl, cval);
1846                 if (!kctl) {
1847                         kfree(cval);
1848                         return -ENOMEM;
1849                 }
1850                 kctl->private_free = usb_mixer_elem_free;
1851 
1852                 if (check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name))) {
1853                         /* nothing */ ;
1854                 } else if (info->name) {
1855                         strlcpy(kctl->id.name, info->name, sizeof(kctl->id.name));
1856                 } else {
1857                         nameid = uac_processing_unit_iProcessing(desc, state->mixer->protocol);
1858                         len = 0;
1859                         if (nameid)
1860                                 len = snd_usb_copy_string_desc(state, nameid,
1861                                                                kctl->id.name,
1862                                                                sizeof(kctl->id.name));
1863                         if (!len)
1864                                 strlcpy(kctl->id.name, name, sizeof(kctl->id.name));
1865                 }
1866                 append_ctl_name(kctl, " ");
1867                 append_ctl_name(kctl, valinfo->suffix);
1868 
1869                 usb_audio_dbg(state->chip,
1870                               "[%d] PU [%s] ch = %d, val = %d/%d\n",
1871                               cval->id, kctl->id.name, cval->channels,
1872                               cval->min, cval->max);
1873 
1874                 err = snd_usb_mixer_add_control(state->mixer, kctl);
1875                 if (err < 0)
1876                         return err;
1877         }
1878         return 0;
1879 }
1880 
1881 static int parse_audio_processing_unit(struct mixer_build *state, int unitid,
1882                                        void *raw_desc)
1883 {
1884         return build_audio_procunit(state, unitid, raw_desc,
1885                                     procunits, "Processing Unit");
1886 }
1887 
1888 static int parse_audio_extension_unit(struct mixer_build *state, int unitid,
1889                                       void *raw_desc)
1890 {
1891         /*
1892          * Note that we parse extension units with processing unit descriptors.
1893          * That's ok as the layout is the same.
1894          */
1895         return build_audio_procunit(state, unitid, raw_desc,
1896                                     extunits, "Extension Unit");
1897 }
1898 
1899 /*
1900  * Selector Unit
1901  */
1902 
1903 /*
1904  * info callback for selector unit
1905  * use an enumerator type for routing
1906  */
1907 static int mixer_ctl_selector_info(struct snd_kcontrol *kcontrol,
1908                                    struct snd_ctl_elem_info *uinfo)
1909 {
1910         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1911         const char **itemlist = (const char **)kcontrol->private_value;
1912 
1913         if (snd_BUG_ON(!itemlist))
1914                 return -EINVAL;
1915         return snd_ctl_enum_info(uinfo, 1, cval->max, itemlist);
1916 }
1917 
1918 /* get callback for selector unit */
1919 static int mixer_ctl_selector_get(struct snd_kcontrol *kcontrol,
1920                                   struct snd_ctl_elem_value *ucontrol)
1921 {
1922         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1923         int val, err;
1924 
1925         err = get_cur_ctl_value(cval, cval->control << 8, &val);
1926         if (err < 0) {
1927                 if (cval->mixer->ignore_ctl_error) {
1928                         ucontrol->value.enumerated.item[0] = 0;
1929                         return 0;
1930                 }
1931                 return err;
1932         }
1933         val = get_relative_value(cval, val);
1934         ucontrol->value.enumerated.item[0] = val;
1935         return 0;
1936 }
1937 
1938 /* put callback for selector unit */
1939 static int mixer_ctl_selector_put(struct snd_kcontrol *kcontrol,
1940                                   struct snd_ctl_elem_value *ucontrol)
1941 {
1942         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1943         int val, oval, err;
1944 
1945         err = get_cur_ctl_value(cval, cval->control << 8, &oval);
1946         if (err < 0) {
1947                 if (cval->mixer->ignore_ctl_error)
1948                         return 0;
1949                 return err;
1950         }
1951         val = ucontrol->value.enumerated.item[0];
1952         val = get_abs_value(cval, val);
1953         if (val != oval) {
1954                 set_cur_ctl_value(cval, cval->control << 8, val);
1955                 return 1;
1956         }
1957         return 0;
1958 }
1959 
1960 /* alsa control interface for selector unit */
1961 static struct snd_kcontrol_new mixer_selectunit_ctl = {
1962         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1963         .name = "", /* will be filled later */
1964         .info = mixer_ctl_selector_info,
1965         .get = mixer_ctl_selector_get,
1966         .put = mixer_ctl_selector_put,
1967 };
1968 
1969 /*
1970  * private free callback.
1971  * free both private_data and private_value
1972  */
1973 static void usb_mixer_selector_elem_free(struct snd_kcontrol *kctl)
1974 {
1975         int i, num_ins = 0;
1976 
1977         if (kctl->private_data) {
1978                 struct usb_mixer_elem_info *cval = kctl->private_data;
1979                 num_ins = cval->max;
1980                 kfree(cval);
1981                 kctl->private_data = NULL;
1982         }
1983         if (kctl->private_value) {
1984                 char **itemlist = (char **)kctl->private_value;
1985                 for (i = 0; i < num_ins; i++)
1986                         kfree(itemlist[i]);
1987                 kfree(itemlist);
1988                 kctl->private_value = 0;
1989         }
1990 }
1991 
1992 /*
1993  * parse a selector unit
1994  */
1995 static int parse_audio_selector_unit(struct mixer_build *state, int unitid,
1996                                      void *raw_desc)
1997 {
1998         struct uac_selector_unit_descriptor *desc = raw_desc;
1999         unsigned int i, nameid, len;
2000         int err;
2001         struct usb_mixer_elem_info *cval;
2002         struct snd_kcontrol *kctl;
2003         const struct usbmix_name_map *map;
2004         char **namelist;
2005 
2006         if (!desc->bNrInPins || desc->bLength < 5 + desc->bNrInPins) {
2007                 usb_audio_err(state->chip,
2008                         "invalid SELECTOR UNIT descriptor %d\n", unitid);
2009                 return -EINVAL;
2010         }
2011 
2012         for (i = 0; i < desc->bNrInPins; i++) {
2013                 if ((err = parse_audio_unit(state, desc->baSourceID[i])) < 0)
2014                         return err;
2015         }
2016 
2017         if (desc->bNrInPins == 1) /* only one ? nonsense! */
2018                 return 0;
2019 
2020         map = find_map(state, unitid, 0);
2021         if (check_ignored_ctl(map))
2022                 return 0;
2023 
2024         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
2025         if (!cval)
2026                 return -ENOMEM;
2027         cval->mixer = state->mixer;
2028         cval->id = unitid;
2029         cval->val_type = USB_MIXER_U8;
2030         cval->channels = 1;
2031         cval->min = 1;
2032         cval->max = desc->bNrInPins;
2033         cval->res = 1;
2034         cval->initialized = 1;
2035 
2036         if (desc->bDescriptorSubtype == UAC2_CLOCK_SELECTOR)
2037                 cval->control = UAC2_CX_CLOCK_SELECTOR;
2038         else
2039                 cval->control = 0;
2040 
2041         namelist = kmalloc(sizeof(char *) * desc->bNrInPins, GFP_KERNEL);
2042         if (!namelist) {
2043                 kfree(cval);
2044                 return -ENOMEM;
2045         }
2046 #define MAX_ITEM_NAME_LEN       64
2047         for (i = 0; i < desc->bNrInPins; i++) {
2048                 struct usb_audio_term iterm;
2049                 len = 0;
2050                 namelist[i] = kmalloc(MAX_ITEM_NAME_LEN, GFP_KERNEL);
2051                 if (!namelist[i]) {
2052                         while (i--)
2053                                 kfree(namelist[i]);
2054                         kfree(namelist);
2055                         kfree(cval);
2056                         return -ENOMEM;
2057                 }
2058                 len = check_mapped_selector_name(state, unitid, i, namelist[i],
2059                                                  MAX_ITEM_NAME_LEN);
2060                 if (! len && check_input_term(state, desc->baSourceID[i], &iterm) >= 0)
2061                         len = get_term_name(state, &iterm, namelist[i], MAX_ITEM_NAME_LEN, 0);
2062                 if (! len)
2063                         sprintf(namelist[i], "Input %u", i);
2064         }
2065 
2066         kctl = snd_ctl_new1(&mixer_selectunit_ctl, cval);
2067         if (! kctl) {
2068                 usb_audio_err(state->chip, "cannot malloc kcontrol\n");
2069                 kfree(namelist);
2070                 kfree(cval);
2071                 return -ENOMEM;
2072         }
2073         kctl->private_value = (unsigned long)namelist;
2074         kctl->private_free = usb_mixer_selector_elem_free;
2075 
2076         nameid = uac_selector_unit_iSelector(desc);
2077         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
2078         if (len)
2079                 ;
2080         else if (nameid)
2081                 snd_usb_copy_string_desc(state, nameid, kctl->id.name,
2082                                          sizeof(kctl->id.name));
2083         else {
2084                 len = get_term_name(state, &state->oterm,
2085                                     kctl->id.name, sizeof(kctl->id.name), 0);
2086                 if (!len)
2087                         strlcpy(kctl->id.name, "USB", sizeof(kctl->id.name));
2088 
2089                 if (desc->bDescriptorSubtype == UAC2_CLOCK_SELECTOR)
2090                         append_ctl_name(kctl, " Clock Source");
2091                 else if ((state->oterm.type & 0xff00) == 0x0100)
2092                         append_ctl_name(kctl, " Capture Source");
2093                 else
2094                         append_ctl_name(kctl, " Playback Source");
2095         }
2096 
2097         usb_audio_dbg(state->chip, "[%d] SU [%s] items = %d\n",
2098                     cval->id, kctl->id.name, desc->bNrInPins);
2099         if ((err = snd_usb_mixer_add_control(state->mixer, kctl)) < 0)
2100                 return err;
2101 
2102         return 0;
2103 }
2104 
2105 /*
2106  * parse an audio unit recursively
2107  */
2108 
2109 static int parse_audio_unit(struct mixer_build *state, int unitid)
2110 {
2111         unsigned char *p1;
2112 
2113         if (test_and_set_bit(unitid, state->unitbitmap))
2114                 return 0; /* the unit already visited */
2115 
2116         p1 = find_audio_control_unit(state, unitid);
2117         if (!p1) {
2118                 usb_audio_err(state->chip, "unit %d not found!\n", unitid);
2119                 return -EINVAL;
2120         }
2121 
2122         switch (p1[2]) {
2123         case UAC_INPUT_TERMINAL:
2124         case UAC2_CLOCK_SOURCE:
2125                 return 0; /* NOP */
2126         case UAC_MIXER_UNIT:
2127                 return parse_audio_mixer_unit(state, unitid, p1);
2128         case UAC_SELECTOR_UNIT:
2129         case UAC2_CLOCK_SELECTOR:
2130                 return parse_audio_selector_unit(state, unitid, p1);
2131         case UAC_FEATURE_UNIT:
2132                 return parse_audio_feature_unit(state, unitid, p1);
2133         case UAC1_PROCESSING_UNIT:
2134         /*   UAC2_EFFECT_UNIT has the same value */
2135                 if (state->mixer->protocol == UAC_VERSION_1)
2136                         return parse_audio_processing_unit(state, unitid, p1);
2137                 else
2138                         return 0; /* FIXME - effect units not implemented yet */
2139         case UAC1_EXTENSION_UNIT:
2140         /*   UAC2_PROCESSING_UNIT_V2 has the same value */
2141                 if (state->mixer->protocol == UAC_VERSION_1)
2142                         return parse_audio_extension_unit(state, unitid, p1);
2143                 else /* UAC_VERSION_2 */
2144                         return parse_audio_processing_unit(state, unitid, p1);
2145         case UAC2_EXTENSION_UNIT_V2:
2146                 return parse_audio_extension_unit(state, unitid, p1);
2147         default:
2148                 usb_audio_err(state->chip,
2149                         "unit %u: unexpected type 0x%02x\n", unitid, p1[2]);
2150                 return -EINVAL;
2151         }
2152 }
2153 
2154 static void snd_usb_mixer_free(struct usb_mixer_interface *mixer)
2155 {
2156         kfree(mixer->id_elems);
2157         if (mixer->urb) {
2158                 kfree(mixer->urb->transfer_buffer);
2159                 usb_free_urb(mixer->urb);
2160         }
2161         usb_free_urb(mixer->rc_urb);
2162         kfree(mixer->rc_setup_packet);
2163         kfree(mixer);
2164 }
2165 
2166 static int snd_usb_mixer_dev_free(struct snd_device *device)
2167 {
2168         struct usb_mixer_interface *mixer = device->device_data;
2169         snd_usb_mixer_free(mixer);
2170         return 0;
2171 }
2172 
2173 /*
2174  * create mixer controls
2175  *
2176  * walk through all UAC_OUTPUT_TERMINAL descriptors to search for mixers
2177  */
2178 static int snd_usb_mixer_controls(struct usb_mixer_interface *mixer)
2179 {
2180         struct mixer_build state;
2181         int err;
2182         const struct usbmix_ctl_map *map;
2183         void *p;
2184 
2185         memset(&state, 0, sizeof(state));
2186         state.chip = mixer->chip;
2187         state.mixer = mixer;
2188         state.buffer = mixer->hostif->extra;
2189         state.buflen = mixer->hostif->extralen;
2190 
2191         /* check the mapping table */
2192         for (map = usbmix_ctl_maps; map->id; map++) {
2193                 if (map->id == state.chip->usb_id) {
2194                         state.map = map->map;
2195                         state.selector_map = map->selector_map;
2196                         mixer->ignore_ctl_error = map->ignore_ctl_error;
2197                         break;
2198                 }
2199         }
2200 
2201         p = NULL;
2202         while ((p = snd_usb_find_csint_desc(mixer->hostif->extra,
2203                                             mixer->hostif->extralen,
2204                                             p, UAC_OUTPUT_TERMINAL)) != NULL) {
2205                 if (mixer->protocol == UAC_VERSION_1) {
2206                         struct uac1_output_terminal_descriptor *desc = p;
2207 
2208                         if (desc->bLength < sizeof(*desc))
2209                                 continue; /* invalid descriptor? */
2210                         /* mark terminal ID as visited */
2211                         set_bit(desc->bTerminalID, state.unitbitmap);
2212                         state.oterm.id = desc->bTerminalID;
2213                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
2214                         state.oterm.name = desc->iTerminal;
2215                         err = parse_audio_unit(&state, desc->bSourceID);
2216                         if (err < 0 && err != -EINVAL)
2217                                 return err;
2218                 } else { /* UAC_VERSION_2 */
2219                         struct uac2_output_terminal_descriptor *desc = p;
2220 
2221                         if (desc->bLength < sizeof(*desc))
2222                                 continue; /* invalid descriptor? */
2223                         /* mark terminal ID as visited */
2224                         set_bit(desc->bTerminalID, state.unitbitmap);
2225                         state.oterm.id = desc->bTerminalID;
2226                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
2227                         state.oterm.name = desc->iTerminal;
2228                         err = parse_audio_unit(&state, desc->bSourceID);
2229                         if (err < 0 && err != -EINVAL)
2230                                 return err;
2231 
2232                         /*
2233                          * For UAC2, use the same approach to also add the
2234                          * clock selectors
2235                          */
2236                         err = parse_audio_unit(&state, desc->bCSourceID);
2237                         if (err < 0 && err != -EINVAL)
2238                                 return err;
2239                 }
2240         }
2241 
2242         return 0;
2243 }
2244 
2245 void snd_usb_mixer_notify_id(struct usb_mixer_interface *mixer, int unitid)
2246 {
2247         struct usb_mixer_elem_info *info;
2248 
2249         for (info = mixer->id_elems[unitid]; info; info = info->next_id_elem)
2250                 snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
2251                                info->elem_id);
2252 }
2253 
2254 static void snd_usb_mixer_dump_cval(struct snd_info_buffer *buffer,
2255                                     int unitid,
2256                                     struct usb_mixer_elem_info *cval)
2257 {
2258         static char *val_types[] = {"BOOLEAN", "INV_BOOLEAN",
2259                                     "S8", "U8", "S16", "U16"};
2260         snd_iprintf(buffer, "  Unit: %i\n", unitid);
2261         if (cval->elem_id)
2262                 snd_iprintf(buffer, "    Control: name=\"%s\", index=%i\n",
2263                                 cval->elem_id->name, cval->elem_id->index);
2264         snd_iprintf(buffer, "    Info: id=%i, control=%i, cmask=0x%x, "
2265                             "channels=%i, type=\"%s\"\n", cval->id,
2266                             cval->control, cval->cmask, cval->channels,
2267                             val_types[cval->val_type]);
2268         snd_iprintf(buffer, "    Volume: min=%i, max=%i, dBmin=%i, dBmax=%i\n",
2269                             cval->min, cval->max, cval->dBmin, cval->dBmax);
2270 }
2271 
2272 static void snd_usb_mixer_proc_read(struct snd_info_entry *entry,
2273                                     struct snd_info_buffer *buffer)
2274 {
2275         struct snd_usb_audio *chip = entry->private_data;
2276         struct usb_mixer_interface *mixer;
2277         struct usb_mixer_elem_info *cval;
2278         int unitid;
2279 
2280         list_for_each_entry(mixer, &chip->mixer_list, list) {
2281                 snd_iprintf(buffer,
2282                         "USB Mixer: usb_id=0x%08x, ctrlif=%i, ctlerr=%i\n",
2283                                 chip->usb_id, snd_usb_ctrl_intf(chip),
2284                                 mixer->ignore_ctl_error);
2285                 snd_iprintf(buffer, "Card: %s\n", chip->card->longname);
2286                 for (unitid = 0; unitid < MAX_ID_ELEMS; unitid++) {
2287                         for (cval = mixer->id_elems[unitid]; cval;
2288                                                 cval = cval->next_id_elem)
2289                                 snd_usb_mixer_dump_cval(buffer, unitid, cval);
2290                 }
2291         }
2292 }
2293 
2294 static void snd_usb_mixer_interrupt_v2(struct usb_mixer_interface *mixer,
2295                                        int attribute, int value, int index)
2296 {
2297         struct usb_mixer_elem_info *info;
2298         __u8 unitid = (index >> 8) & 0xff;
2299         __u8 control = (value >> 8) & 0xff;
2300         __u8 channel = value & 0xff;
2301 
2302         if (channel >= MAX_CHANNELS) {
2303                 usb_audio_dbg(mixer->chip,
2304                         "%s(): bogus channel number %d\n",
2305                         __func__, channel);
2306                 return;
2307         }
2308 
2309         for (info = mixer->id_elems[unitid]; info; info = info->next_id_elem) {
2310                 if (info->control != control)
2311                         continue;
2312 
2313                 switch (attribute) {
2314                 case UAC2_CS_CUR:
2315                         /* invalidate cache, so the value is read from the device */
2316                         if (channel)
2317                                 info->cached &= ~(1 << channel);
2318                         else /* master channel */
2319                                 info->cached = 0;
2320 
2321                         snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
2322                                         info->elem_id);
2323                         break;
2324 
2325                 case UAC2_CS_RANGE:
2326                         /* TODO */
2327                         break;
2328 
2329                 case UAC2_CS_MEM:
2330                         /* TODO */
2331                         break;
2332 
2333                 default:
2334                         usb_audio_dbg(mixer->chip,
2335                                 "unknown attribute %d in interrupt\n",
2336                                 attribute);
2337                         break;
2338                 } /* switch */
2339         }
2340 }
2341 
2342 static void snd_usb_mixer_interrupt(struct urb *urb)
2343 {
2344         struct usb_mixer_interface *mixer = urb->context;
2345         int len = urb->actual_length;
2346         int ustatus = urb->status;
2347 
2348         if (ustatus != 0)
2349                 goto requeue;
2350 
2351         if (mixer->protocol == UAC_VERSION_1) {
2352                 struct uac1_status_word *status;
2353 
2354                 for (status = urb->transfer_buffer;
2355                      len >= sizeof(*status);
2356                      len -= sizeof(*status), status++) {
2357                         dev_dbg(&urb->dev->dev, "status interrupt: %02x %02x\n",
2358                                                 status->bStatusType,
2359                                                 status->bOriginator);
2360 
2361                         /* ignore any notifications not from the control interface */
2362                         if ((status->bStatusType & UAC1_STATUS_TYPE_ORIG_MASK) !=
2363                                 UAC1_STATUS_TYPE_ORIG_AUDIO_CONTROL_IF)
2364                                 continue;
2365 
2366                         if (status->bStatusType & UAC1_STATUS_TYPE_MEM_CHANGED)
2367                                 snd_usb_mixer_rc_memory_change(mixer, status->bOriginator);
2368                         else
2369                                 snd_usb_mixer_notify_id(mixer, status->bOriginator);
2370                 }
2371         } else { /* UAC_VERSION_2 */
2372                 struct uac2_interrupt_data_msg *msg;
2373 
2374                 for (msg = urb->transfer_buffer;
2375                      len >= sizeof(*msg);
2376                      len -= sizeof(*msg), msg++) {
2377                         /* drop vendor specific and endpoint requests */
2378                         if ((msg->bInfo & UAC2_INTERRUPT_DATA_MSG_VENDOR) ||
2379                             (msg->bInfo & UAC2_INTERRUPT_DATA_MSG_EP))
2380                                 continue;
2381 
2382                         snd_usb_mixer_interrupt_v2(mixer, msg->bAttribute,
2383                                                    le16_to_cpu(msg->wValue),
2384                                                    le16_to_cpu(msg->wIndex));
2385                 }
2386         }
2387 
2388 requeue:
2389         if (ustatus != -ENOENT &&
2390             ustatus != -ECONNRESET &&
2391             ustatus != -ESHUTDOWN) {
2392                 urb->dev = mixer->chip->dev;
2393                 usb_submit_urb(urb, GFP_ATOMIC);
2394         }
2395 }
2396 
2397 /* create the handler for the optional status interrupt endpoint */
2398 static int snd_usb_mixer_status_create(struct usb_mixer_interface *mixer)
2399 {
2400         struct usb_endpoint_descriptor *ep;
2401         void *transfer_buffer;
2402         int buffer_length;
2403         unsigned int epnum;
2404 
2405         /* we need one interrupt input endpoint */
2406         if (get_iface_desc(mixer->hostif)->bNumEndpoints < 1)
2407                 return 0;
2408         ep = get_endpoint(mixer->hostif, 0);
2409         if (!usb_endpoint_dir_in(ep) || !usb_endpoint_xfer_int(ep))
2410                 return 0;
2411 
2412         epnum = usb_endpoint_num(ep);
2413         buffer_length = le16_to_cpu(ep->wMaxPacketSize);
2414         transfer_buffer = kmalloc(buffer_length, GFP_KERNEL);
2415         if (!transfer_buffer)
2416                 return -ENOMEM;
2417         mixer->urb = usb_alloc_urb(0, GFP_KERNEL);
2418         if (!mixer->urb) {
2419                 kfree(transfer_buffer);
2420                 return -ENOMEM;
2421         }
2422         usb_fill_int_urb(mixer->urb, mixer->chip->dev,
2423                          usb_rcvintpipe(mixer->chip->dev, epnum),
2424                          transfer_buffer, buffer_length,
2425                          snd_usb_mixer_interrupt, mixer, ep->bInterval);
2426         usb_submit_urb(mixer->urb, GFP_KERNEL);
2427         return 0;
2428 }
2429 
2430 int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif,
2431                          int ignore_error)
2432 {
2433         static struct snd_device_ops dev_ops = {
2434                 .dev_free = snd_usb_mixer_dev_free
2435         };
2436         struct usb_mixer_interface *mixer;
2437         struct snd_info_entry *entry;
2438         int err;
2439 
2440         strcpy(chip->card->mixername, "USB Mixer");
2441 
2442         mixer = kzalloc(sizeof(*mixer), GFP_KERNEL);
2443         if (!mixer)
2444                 return -ENOMEM;
2445         mixer->chip = chip;
2446         mixer->ignore_ctl_error = ignore_error;
2447         mixer->id_elems = kcalloc(MAX_ID_ELEMS, sizeof(*mixer->id_elems),
2448                                   GFP_KERNEL);
2449         if (!mixer->id_elems) {
2450                 kfree(mixer);
2451                 return -ENOMEM;
2452         }
2453 
2454         mixer->hostif = &usb_ifnum_to_if(chip->dev, ctrlif)->altsetting[0];
2455         switch (get_iface_desc(mixer->hostif)->bInterfaceProtocol) {
2456         case UAC_VERSION_1:
2457         default:
2458                 mixer->protocol = UAC_VERSION_1;
2459                 break;
2460         case UAC_VERSION_2:
2461                 mixer->protocol = UAC_VERSION_2;
2462                 break;
2463         }
2464 
2465         if ((err = snd_usb_mixer_controls(mixer)) < 0 ||
2466             (err = snd_usb_mixer_status_create(mixer)) < 0)
2467                 goto _error;
2468 
2469         snd_usb_mixer_apply_create_quirk(mixer);
2470 
2471         err = snd_device_new(chip->card, SNDRV_DEV_CODEC, mixer, &dev_ops);
2472         if (err < 0)
2473                 goto _error;
2474 
2475         if (list_empty(&chip->mixer_list) &&
2476             !snd_card_proc_new(chip->card, "usbmixer", &entry))
2477                 snd_info_set_text_ops(entry, chip, snd_usb_mixer_proc_read);
2478 
2479         list_add(&mixer->list, &chip->mixer_list);
2480         return 0;
2481 
2482 _error:
2483         snd_usb_mixer_free(mixer);
2484         return err;
2485 }
2486 
2487 void snd_usb_mixer_disconnect(struct list_head *p)
2488 {
2489         struct usb_mixer_interface *mixer;
2490 
2491         mixer = list_entry(p, struct usb_mixer_interface, list);
2492         usb_kill_urb(mixer->urb);
2493         usb_kill_urb(mixer->rc_urb);
2494 }
2495 
2496 #ifdef CONFIG_PM
2497 /* stop any bus activity of a mixer */
2498 static void snd_usb_mixer_inactivate(struct usb_mixer_interface *mixer)
2499 {
2500         usb_kill_urb(mixer->urb);
2501         usb_kill_urb(mixer->rc_urb);
2502 }
2503 
2504 static int snd_usb_mixer_activate(struct usb_mixer_interface *mixer)
2505 {
2506         int err;
2507 
2508         if (mixer->urb) {
2509                 err = usb_submit_urb(mixer->urb, GFP_NOIO);
2510                 if (err < 0)
2511                         return err;
2512         }
2513 
2514         return 0;
2515 }
2516 
2517 int snd_usb_mixer_suspend(struct usb_mixer_interface *mixer)
2518 {
2519         snd_usb_mixer_inactivate(mixer);
2520         return 0;
2521 }
2522 
2523 static int restore_mixer_value(struct usb_mixer_elem_info *cval)
2524 {
2525         int c, err, idx;
2526 
2527         if (cval->cmask) {
2528                 idx = 0;
2529                 for (c = 0; c < MAX_CHANNELS; c++) {
2530                         if (!(cval->cmask & (1 << c)))
2531                                 continue;
2532                         if (cval->cached & (1 << c)) {
2533                                 err = set_cur_mix_value(cval, c + 1, idx,
2534                                                         cval->cache_val[idx]);
2535                                 if (err < 0)
2536                                         return err;
2537                         }
2538                         idx++;
2539                 }
2540         } else {
2541                 /* master */
2542                 if (cval->cached) {
2543                         err = set_cur_mix_value(cval, 0, 0, *cval->cache_val);
2544                         if (err < 0)
2545                                 return err;
2546                 }
2547         }
2548 
2549         return 0;
2550 }
2551 
2552 int snd_usb_mixer_resume(struct usb_mixer_interface *mixer, bool reset_resume)
2553 {
2554         struct usb_mixer_elem_info *cval;
2555         int id, err;
2556 
2557         /* FIXME: any mixer quirks? */
2558 
2559         if (reset_resume) {
2560                 /* restore cached mixer values */
2561                 for (id = 0; id < MAX_ID_ELEMS; id++) {
2562                         for (cval = mixer->id_elems[id]; cval;
2563                              cval = cval->next_id_elem) {
2564                                 err = restore_mixer_value(cval);
2565                                 if (err < 0)
2566                                         return err;
2567                         }
2568                 }
2569         }
2570 
2571         return snd_usb_mixer_activate(mixer);
2572 }
2573 #endif
2574 

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