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

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  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 
203         if (len < 0)
204                 return 0;
205 
206         buf[len] = 0;
207         return len;
208 }
209 
210 /*
211  * convert from the byte/word on usb descriptor to the zero-based integer
212  */
213 static int convert_signed_value(struct usb_mixer_elem_info *cval, int val)
214 {
215         switch (cval->val_type) {
216         case USB_MIXER_BOOLEAN:
217                 return !!val;
218         case USB_MIXER_INV_BOOLEAN:
219                 return !val;
220         case USB_MIXER_U8:
221                 val &= 0xff;
222                 break;
223         case USB_MIXER_S8:
224                 val &= 0xff;
225                 if (val >= 0x80)
226                         val -= 0x100;
227                 break;
228         case USB_MIXER_U16:
229                 val &= 0xffff;
230                 break;
231         case USB_MIXER_S16:
232                 val &= 0xffff;
233                 if (val >= 0x8000)
234                         val -= 0x10000;
235                 break;
236         }
237         return val;
238 }
239 
240 /*
241  * convert from the zero-based int to the byte/word for usb descriptor
242  */
243 static int convert_bytes_value(struct usb_mixer_elem_info *cval, int val)
244 {
245         switch (cval->val_type) {
246         case USB_MIXER_BOOLEAN:
247                 return !!val;
248         case USB_MIXER_INV_BOOLEAN:
249                 return !val;
250         case USB_MIXER_S8:
251         case USB_MIXER_U8:
252                 return val & 0xff;
253         case USB_MIXER_S16:
254         case USB_MIXER_U16:
255                 return val & 0xffff;
256         }
257         return 0; /* not reached */
258 }
259 
260 static int get_relative_value(struct usb_mixer_elem_info *cval, int val)
261 {
262         if (!cval->res)
263                 cval->res = 1;
264         if (val < cval->min)
265                 return 0;
266         else if (val >= cval->max)
267                 return (cval->max - cval->min + cval->res - 1) / cval->res;
268         else
269                 return (val - cval->min) / cval->res;
270 }
271 
272 static int get_abs_value(struct usb_mixer_elem_info *cval, int val)
273 {
274         if (val < 0)
275                 return cval->min;
276         if (!cval->res)
277                 cval->res = 1;
278         val *= cval->res;
279         val += cval->min;
280         if (val > cval->max)
281                 return cval->max;
282         return val;
283 }
284 
285 
286 /*
287  * retrieve a mixer value
288  */
289 
290 static int get_ctl_value_v1(struct usb_mixer_elem_info *cval, int request,
291                             int validx, int *value_ret)
292 {
293         struct snd_usb_audio *chip = cval->mixer->chip;
294         unsigned char buf[2];
295         int val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
296         int timeout = 10;
297         int idx = 0, err;
298 
299         err = snd_usb_autoresume(cval->mixer->chip);
300         if (err < 0)
301                 return -EIO;
302 
303         down_read(&chip->shutdown_rwsem);
304         while (timeout-- > 0) {
305                 if (chip->shutdown)
306                         break;
307                 idx = snd_usb_ctrl_intf(chip) | (cval->id << 8);
308                 if (snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), request,
309                                     USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
310                                     validx, idx, buf, val_len) >= val_len) {
311                         *value_ret = convert_signed_value(cval, snd_usb_combine_bytes(buf, val_len));
312                         err = 0;
313                         goto out;
314                 }
315         }
316         usb_audio_dbg(chip,
317                 "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
318                 request, validx, idx, cval->val_type);
319         err = -EINVAL;
320 
321  out:
322         up_read(&chip->shutdown_rwsem);
323         snd_usb_autosuspend(cval->mixer->chip);
324         return err;
325 }
326 
327 static int get_ctl_value_v2(struct usb_mixer_elem_info *cval, int request,
328                             int validx, int *value_ret)
329 {
330         struct snd_usb_audio *chip = cval->mixer->chip;
331         unsigned char buf[2 + 3 * sizeof(__u16)]; /* enough space for one range */
332         unsigned char *val;
333         int idx = 0, ret, size;
334         __u8 bRequest;
335 
336         if (request == UAC_GET_CUR) {
337                 bRequest = UAC2_CS_CUR;
338                 size = sizeof(__u16);
339         } else {
340                 bRequest = UAC2_CS_RANGE;
341                 size = sizeof(buf);
342         }
343 
344         memset(buf, 0, sizeof(buf));
345 
346         ret = snd_usb_autoresume(chip) ? -EIO : 0;
347         if (ret)
348                 goto error;
349 
350         down_read(&chip->shutdown_rwsem);
351         if (chip->shutdown) {
352                 ret = -ENODEV;
353         } else {
354                 idx = snd_usb_ctrl_intf(chip) | (cval->id << 8);
355                 ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), bRequest,
356                               USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
357                               validx, idx, buf, size);
358         }
359         up_read(&chip->shutdown_rwsem);
360         snd_usb_autosuspend(chip);
361 
362         if (ret < 0) {
363 error:
364                 usb_audio_err(chip,
365                         "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
366                         request, validx, idx, cval->val_type);
367                 return ret;
368         }
369 
370         /* FIXME: how should we handle multiple triplets here? */
371 
372         switch (request) {
373         case UAC_GET_CUR:
374                 val = buf;
375                 break;
376         case UAC_GET_MIN:
377                 val = buf + sizeof(__u16);
378                 break;
379         case UAC_GET_MAX:
380                 val = buf + sizeof(__u16) * 2;
381                 break;
382         case UAC_GET_RES:
383                 val = buf + sizeof(__u16) * 3;
384                 break;
385         default:
386                 return -EINVAL;
387         }
388 
389         *value_ret = convert_signed_value(cval, snd_usb_combine_bytes(val, sizeof(__u16)));
390 
391         return 0;
392 }
393 
394 static int get_ctl_value(struct usb_mixer_elem_info *cval, int request,
395                          int validx, int *value_ret)
396 {
397         validx += cval->idx_off;
398 
399         return (cval->mixer->protocol == UAC_VERSION_1) ?
400                 get_ctl_value_v1(cval, request, validx, value_ret) :
401                 get_ctl_value_v2(cval, request, validx, value_ret);
402 }
403 
404 static int get_cur_ctl_value(struct usb_mixer_elem_info *cval,
405                              int validx, int *value)
406 {
407         return get_ctl_value(cval, UAC_GET_CUR, validx, value);
408 }
409 
410 /* channel = 0: master, 1 = first channel */
411 static inline int get_cur_mix_raw(struct usb_mixer_elem_info *cval,
412                                   int channel, int *value)
413 {
414         return get_ctl_value(cval, UAC_GET_CUR,
415                              (cval->control << 8) | channel,
416                              value);
417 }
418 
419 static int get_cur_mix_value(struct usb_mixer_elem_info *cval,
420                              int channel, int index, int *value)
421 {
422         int err;
423 
424         if (cval->cached & (1 << channel)) {
425                 *value = cval->cache_val[index];
426                 return 0;
427         }
428         err = get_cur_mix_raw(cval, channel, value);
429         if (err < 0) {
430                 if (!cval->mixer->ignore_ctl_error)
431                         usb_audio_dbg(cval->mixer->chip,
432                                 "cannot get current value for control %d ch %d: err = %d\n",
433                                       cval->control, channel, err);
434                 return err;
435         }
436         cval->cached |= 1 << channel;
437         cval->cache_val[index] = *value;
438         return 0;
439 }
440 
441 /*
442  * set a mixer value
443  */
444 
445 int snd_usb_mixer_set_ctl_value(struct usb_mixer_elem_info *cval,
446                                 int request, int validx, int value_set)
447 {
448         struct snd_usb_audio *chip = cval->mixer->chip;
449         unsigned char buf[2];
450         int idx = 0, val_len, err, timeout = 10;
451 
452         validx += cval->idx_off;
453 
454         if (cval->mixer->protocol == UAC_VERSION_1) {
455                 val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
456         } else { /* UAC_VERSION_2 */
457                 /* audio class v2 controls are always 2 bytes in size */
458                 val_len = sizeof(__u16);
459 
460                 /* FIXME */
461                 if (request != UAC_SET_CUR) {
462                         usb_audio_dbg(chip, "RANGE setting not yet supported\n");
463                         return -EINVAL;
464                 }
465 
466                 request = UAC2_CS_CUR;
467         }
468 
469         value_set = convert_bytes_value(cval, value_set);
470         buf[0] = value_set & 0xff;
471         buf[1] = (value_set >> 8) & 0xff;
472         err = snd_usb_autoresume(chip);
473         if (err < 0)
474                 return -EIO;
475         down_read(&chip->shutdown_rwsem);
476         while (timeout-- > 0) {
477                 if (chip->shutdown)
478                         break;
479                 idx = snd_usb_ctrl_intf(chip) | (cval->id << 8);
480                 if (snd_usb_ctl_msg(chip->dev,
481                                     usb_sndctrlpipe(chip->dev, 0), request,
482                                     USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
483                                     validx, idx, buf, val_len) >= 0) {
484                         err = 0;
485                         goto out;
486                 }
487         }
488         usb_audio_dbg(chip, "cannot set ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d, data = %#x/%#x\n",
489                       request, validx, idx, cval->val_type, buf[0], buf[1]);
490         err = -EINVAL;
491 
492  out:
493         up_read(&chip->shutdown_rwsem);
494         snd_usb_autosuspend(chip);
495         return err;
496 }
497 
498 static int set_cur_ctl_value(struct usb_mixer_elem_info *cval,
499                              int validx, int value)
500 {
501         return snd_usb_mixer_set_ctl_value(cval, UAC_SET_CUR, validx, value);
502 }
503 
504 static int set_cur_mix_value(struct usb_mixer_elem_info *cval, int channel,
505                              int index, int value)
506 {
507         int err;
508         unsigned int read_only = (channel == 0) ?
509                 cval->master_readonly :
510                 cval->ch_readonly & (1 << (channel - 1));
511 
512         if (read_only) {
513                 usb_audio_dbg(cval->mixer->chip,
514                               "%s(): channel %d of control %d is read_only\n",
515                             __func__, channel, cval->control);
516                 return 0;
517         }
518 
519         err = snd_usb_mixer_set_ctl_value(cval,
520                                           UAC_SET_CUR, (cval->control << 8) | channel,
521                                           value);
522         if (err < 0)
523                 return err;
524         cval->cached |= 1 << channel;
525         cval->cache_val[index] = value;
526         return 0;
527 }
528 
529 /*
530  * TLV callback for mixer volume controls
531  */
532 int snd_usb_mixer_vol_tlv(struct snd_kcontrol *kcontrol, int op_flag,
533                          unsigned int size, unsigned int __user *_tlv)
534 {
535         struct usb_mixer_elem_info *cval = kcontrol->private_data;
536         DECLARE_TLV_DB_MINMAX(scale, 0, 0);
537 
538         if (size < sizeof(scale))
539                 return -ENOMEM;
540         scale[2] = cval->dBmin;
541         scale[3] = cval->dBmax;
542         if (copy_to_user(_tlv, scale, sizeof(scale)))
543                 return -EFAULT;
544         return 0;
545 }
546 
547 /*
548  * parser routines begin here...
549  */
550 
551 static int parse_audio_unit(struct mixer_build *state, int unitid);
552 
553 
554 /*
555  * check if the input/output channel routing is enabled on the given bitmap.
556  * used for mixer unit parser
557  */
558 static int check_matrix_bitmap(unsigned char *bmap,
559                                int ich, int och, int num_outs)
560 {
561         int idx = ich * num_outs + och;
562         return bmap[idx >> 3] & (0x80 >> (idx & 7));
563 }
564 
565 /*
566  * add an alsa control element
567  * search and increment the index until an empty slot is found.
568  *
569  * if failed, give up and free the control instance.
570  */
571 
572 int snd_usb_mixer_add_control(struct usb_mixer_interface *mixer,
573                               struct snd_kcontrol *kctl)
574 {
575         struct usb_mixer_elem_info *cval = kctl->private_data;
576         int err;
577 
578         while (snd_ctl_find_id(mixer->chip->card, &kctl->id))
579                 kctl->id.index++;
580         if ((err = snd_ctl_add(mixer->chip->card, kctl)) < 0) {
581                 usb_audio_dbg(mixer->chip, "cannot add control (err = %d)\n",
582                               err);
583                 return err;
584         }
585         cval->elem_id = &kctl->id;
586         cval->next_id_elem = mixer->id_elems[cval->id];
587         mixer->id_elems[cval->id] = cval;
588         return 0;
589 }
590 
591 /*
592  * get a terminal name string
593  */
594 
595 static struct iterm_name_combo {
596         int type;
597         char *name;
598 } iterm_names[] = {
599         { 0x0300, "Output" },
600         { 0x0301, "Speaker" },
601         { 0x0302, "Headphone" },
602         { 0x0303, "HMD Audio" },
603         { 0x0304, "Desktop Speaker" },
604         { 0x0305, "Room Speaker" },
605         { 0x0306, "Com Speaker" },
606         { 0x0307, "LFE" },
607         { 0x0600, "External In" },
608         { 0x0601, "Analog In" },
609         { 0x0602, "Digital In" },
610         { 0x0603, "Line" },
611         { 0x0604, "Legacy In" },
612         { 0x0605, "IEC958 In" },
613         { 0x0606, "1394 DA Stream" },
614         { 0x0607, "1394 DV Stream" },
615         { 0x0700, "Embedded" },
616         { 0x0701, "Noise Source" },
617         { 0x0702, "Equalization Noise" },
618         { 0x0703, "CD" },
619         { 0x0704, "DAT" },
620         { 0x0705, "DCC" },
621         { 0x0706, "MiniDisk" },
622         { 0x0707, "Analog Tape" },
623         { 0x0708, "Phonograph" },
624         { 0x0709, "VCR Audio" },
625         { 0x070a, "Video Disk Audio" },
626         { 0x070b, "DVD Audio" },
627         { 0x070c, "TV Tuner Audio" },
628         { 0x070d, "Satellite Rec Audio" },
629         { 0x070e, "Cable Tuner Audio" },
630         { 0x070f, "DSS Audio" },
631         { 0x0710, "Radio Receiver" },
632         { 0x0711, "Radio Transmitter" },
633         { 0x0712, "Multi-Track Recorder" },
634         { 0x0713, "Synthesizer" },
635         { 0 },
636 };
637 
638 static int get_term_name(struct mixer_build *state, struct usb_audio_term *iterm,
639                          unsigned char *name, int maxlen, int term_only)
640 {
641         struct iterm_name_combo *names;
642 
643         if (iterm->name)
644                 return snd_usb_copy_string_desc(state, iterm->name,
645                                                 name, maxlen);
646 
647         /* virtual type - not a real terminal */
648         if (iterm->type >> 16) {
649                 if (term_only)
650                         return 0;
651                 switch (iterm->type >> 16) {
652                 case UAC_SELECTOR_UNIT:
653                         strcpy(name, "Selector");
654                         return 8;
655                 case UAC1_PROCESSING_UNIT:
656                         strcpy(name, "Process Unit");
657                         return 12;
658                 case UAC1_EXTENSION_UNIT:
659                         strcpy(name, "Ext Unit");
660                         return 8;
661                 case UAC_MIXER_UNIT:
662                         strcpy(name, "Mixer");
663                         return 5;
664                 default:
665                         return sprintf(name, "Unit %d", iterm->id);
666                 }
667         }
668 
669         switch (iterm->type & 0xff00) {
670         case 0x0100:
671                 strcpy(name, "PCM");
672                 return 3;
673         case 0x0200:
674                 strcpy(name, "Mic");
675                 return 3;
676         case 0x0400:
677                 strcpy(name, "Headset");
678                 return 7;
679         case 0x0500:
680                 strcpy(name, "Phone");
681                 return 5;
682         }
683 
684         for (names = iterm_names; names->type; names++) {
685                 if (names->type == iterm->type) {
686                         strcpy(name, names->name);
687                         return strlen(names->name);
688                 }
689         }
690 
691         return 0;
692 }
693 
694 /*
695  * parse the source unit recursively until it reaches to a terminal
696  * or a branched unit.
697  */
698 static int check_input_term(struct mixer_build *state, int id,
699                             struct usb_audio_term *term)
700 {
701         int err;
702         void *p1;
703 
704         memset(term, 0, sizeof(*term));
705         while ((p1 = find_audio_control_unit(state, id)) != NULL) {
706                 unsigned char *hdr = p1;
707                 term->id = id;
708                 switch (hdr[2]) {
709                 case UAC_INPUT_TERMINAL:
710                         if (state->mixer->protocol == UAC_VERSION_1) {
711                                 struct uac_input_terminal_descriptor *d = p1;
712                                 term->type = le16_to_cpu(d->wTerminalType);
713                                 term->channels = d->bNrChannels;
714                                 term->chconfig = le16_to_cpu(d->wChannelConfig);
715                                 term->name = d->iTerminal;
716                         } else { /* UAC_VERSION_2 */
717                                 struct uac2_input_terminal_descriptor *d = p1;
718                                 term->type = le16_to_cpu(d->wTerminalType);
719                                 term->channels = d->bNrChannels;
720                                 term->chconfig = le32_to_cpu(d->bmChannelConfig);
721                                 term->name = d->iTerminal;
722 
723                                 /* call recursively to get the clock selectors */
724                                 err = check_input_term(state, d->bCSourceID, term);
725                                 if (err < 0)
726                                         return err;
727                         }
728                         return 0;
729                 case UAC_FEATURE_UNIT: {
730                         /* the header is the same for v1 and v2 */
731                         struct uac_feature_unit_descriptor *d = p1;
732                         id = d->bSourceID;
733                         break; /* continue to parse */
734                 }
735                 case UAC_MIXER_UNIT: {
736                         struct uac_mixer_unit_descriptor *d = p1;
737                         term->type = d->bDescriptorSubtype << 16; /* virtual type */
738                         term->channels = uac_mixer_unit_bNrChannels(d);
739                         term->chconfig = uac_mixer_unit_wChannelConfig(d, state->mixer->protocol);
740                         term->name = uac_mixer_unit_iMixer(d);
741                         return 0;
742                 }
743                 case UAC_SELECTOR_UNIT:
744                 case UAC2_CLOCK_SELECTOR: {
745                         struct uac_selector_unit_descriptor *d = p1;
746                         /* call recursively to retrieve the channel info */
747                         err = check_input_term(state, d->baSourceID[0], term);
748                         if (err < 0)
749                                 return err;
750                         term->type = d->bDescriptorSubtype << 16; /* virtual type */
751                         term->id = id;
752                         term->name = uac_selector_unit_iSelector(d);
753                         return 0;
754                 }
755                 case UAC1_PROCESSING_UNIT:
756                 case UAC1_EXTENSION_UNIT:
757                 /* UAC2_PROCESSING_UNIT_V2 */
758                 /* UAC2_EFFECT_UNIT */
759                 case UAC2_EXTENSION_UNIT_V2: {
760                         struct uac_processing_unit_descriptor *d = p1;
761 
762                         if (state->mixer->protocol == UAC_VERSION_2 &&
763                                 hdr[2] == UAC2_EFFECT_UNIT) {
764                                 /* UAC2/UAC1 unit IDs overlap here in an
765                                  * uncompatible way. Ignore this unit for now.
766                                  */
767                                 return 0;
768                         }
769 
770                         if (d->bNrInPins) {
771                                 id = d->baSourceID[0];
772                                 break; /* continue to parse */
773                         }
774                         term->type = d->bDescriptorSubtype << 16; /* virtual type */
775                         term->channels = uac_processing_unit_bNrChannels(d);
776                         term->chconfig = uac_processing_unit_wChannelConfig(d, state->mixer->protocol);
777                         term->name = uac_processing_unit_iProcessing(d, state->mixer->protocol);
778                         return 0;
779                 }
780                 case UAC2_CLOCK_SOURCE: {
781                         struct uac_clock_source_descriptor *d = p1;
782                         term->type = d->bDescriptorSubtype << 16; /* virtual type */
783                         term->id = id;
784                         term->name = d->iClockSource;
785                         return 0;
786                 }
787                 default:
788                         return -ENODEV;
789                 }
790         }
791         return -ENODEV;
792 }
793 
794 /*
795  * Feature Unit
796  */
797 
798 /* feature unit control information */
799 struct usb_feature_control_info {
800         const char *name;
801         unsigned int type;      /* control type (mute, volume, etc.) */
802 };
803 
804 static struct usb_feature_control_info audio_feature_info[] = {
805         { "Mute",                       USB_MIXER_INV_BOOLEAN },
806         { "Volume",                     USB_MIXER_S16 },
807         { "Tone Control - Bass",        USB_MIXER_S8 },
808         { "Tone Control - Mid",         USB_MIXER_S8 },
809         { "Tone Control - Treble",      USB_MIXER_S8 },
810         { "Graphic Equalizer",          USB_MIXER_S8 }, /* FIXME: not implemeted yet */
811         { "Auto Gain Control",          USB_MIXER_BOOLEAN },
812         { "Delay Control",              USB_MIXER_U16 }, /* FIXME: U32 in UAC2 */
813         { "Bass Boost",                 USB_MIXER_BOOLEAN },
814         { "Loudness",                   USB_MIXER_BOOLEAN },
815         /* UAC2 specific */
816         { "Input Gain Control",         USB_MIXER_S16 },
817         { "Input Gain Pad Control",     USB_MIXER_S16 },
818         { "Phase Inverter Control",     USB_MIXER_BOOLEAN },
819 };
820 
821 /* private_free callback */
822 static void usb_mixer_elem_free(struct snd_kcontrol *kctl)
823 {
824         kfree(kctl->private_data);
825         kctl->private_data = NULL;
826 }
827 
828 /*
829  * interface to ALSA control for feature/mixer units
830  */
831 
832 /* volume control quirks */
833 static void volume_control_quirks(struct usb_mixer_elem_info *cval,
834                                   struct snd_kcontrol *kctl)
835 {
836         struct snd_usb_audio *chip = cval->mixer->chip;
837         switch (chip->usb_id) {
838         case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
839         case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
840                 if (strcmp(kctl->id.name, "Effect Duration") == 0) {
841                         cval->min = 0x0000;
842                         cval->max = 0xffff;
843                         cval->res = 0x00e6;
844                         break;
845                 }
846                 if (strcmp(kctl->id.name, "Effect Volume") == 0 ||
847                     strcmp(kctl->id.name, "Effect Feedback Volume") == 0) {
848                         cval->min = 0x00;
849                         cval->max = 0xff;
850                         break;
851                 }
852                 if (strstr(kctl->id.name, "Effect Return") != NULL) {
853                         cval->min = 0xb706;
854                         cval->max = 0xff7b;
855                         cval->res = 0x0073;
856                         break;
857                 }
858                 if ((strstr(kctl->id.name, "Playback Volume") != NULL) ||
859                         (strstr(kctl->id.name, "Effect Send") != NULL)) {
860                         cval->min = 0xb5fb; /* -73 dB = 0xb6ff */
861                         cval->max = 0xfcfe;
862                         cval->res = 0x0073;
863                 }
864                 break;
865 
866         case USB_ID(0x0763, 0x2081): /* M-Audio Fast Track Ultra 8R */
867         case USB_ID(0x0763, 0x2080): /* M-Audio Fast Track Ultra */
868                 if (strcmp(kctl->id.name, "Effect Duration") == 0) {
869                         usb_audio_info(chip,
870                                        "set quirk for FTU Effect Duration\n");
871                         cval->min = 0x0000;
872                         cval->max = 0x7f00;
873                         cval->res = 0x0100;
874                         break;
875                 }
876                 if (strcmp(kctl->id.name, "Effect Volume") == 0 ||
877                     strcmp(kctl->id.name, "Effect Feedback Volume") == 0) {
878                         usb_audio_info(chip,
879                                        "set quirks for FTU Effect Feedback/Volume\n");
880                         cval->min = 0x00;
881                         cval->max = 0x7f;
882                         break;
883                 }
884                 break;
885 
886         case USB_ID(0x0d8c, 0x0103):
887                 if (!strcmp(kctl->id.name, "PCM Playback Volume")) {
888                         usb_audio_info(chip,
889                                  "set volume quirk for CM102-A+/102S+\n");
890                         cval->min = -256;
891                 }
892                 break;
893 
894         case USB_ID(0x0471, 0x0101):
895         case USB_ID(0x0471, 0x0104):
896         case USB_ID(0x0471, 0x0105):
897         case USB_ID(0x0672, 0x1041):
898         /* quirk for UDA1321/N101.
899          * note that detection between firmware 2.1.1.7 (N101)
900          * and later 2.1.1.21 is not very clear from datasheets.
901          * I hope that the min value is -15360 for newer firmware --jk
902          */
903                 if (!strcmp(kctl->id.name, "PCM Playback Volume") &&
904                     cval->min == -15616) {
905                         usb_audio_info(chip,
906                                  "set volume quirk for UDA1321/N101 chip\n");
907                         cval->max = -256;
908                 }
909                 break;
910 
911         case USB_ID(0x046d, 0x09a4):
912                 if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
913                         usb_audio_info(chip,
914                                 "set volume quirk for QuickCam E3500\n");
915                         cval->min = 6080;
916                         cval->max = 8768;
917                         cval->res = 192;
918                 }
919                 break;
920 
921         case USB_ID(0x046d, 0x0807): /* Logitech Webcam C500 */
922         case USB_ID(0x046d, 0x0808):
923         case USB_ID(0x046d, 0x0809):
924         case USB_ID(0x046d, 0x0819): /* Logitech Webcam C210 */
925         case USB_ID(0x046d, 0x081b): /* HD Webcam c310 */
926         case USB_ID(0x046d, 0x081d): /* HD Webcam c510 */
927         case USB_ID(0x046d, 0x0825): /* HD Webcam c270 */
928         case USB_ID(0x046d, 0x0826): /* HD Webcam c525 */
929         case USB_ID(0x046d, 0x08ca): /* Logitech Quickcam Fusion */
930         case USB_ID(0x046d, 0x0991):
931         case USB_ID(0x046d, 0x09a2): /* QuickCam Communicate Deluxe/S7500 */
932         /* Most audio usb devices lie about volume resolution.
933          * Most Logitech webcams have res = 384.
934          * Probably there is some logitech magic behind this number --fishor
935          */
936                 if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
937                         usb_audio_info(chip,
938                                 "set resolution quirk: cval->res = 384\n");
939                         cval->res = 384;
940                 }
941                 break;
942         }
943 }
944 
945 /*
946  * retrieve the minimum and maximum values for the specified control
947  */
948 static int get_min_max_with_quirks(struct usb_mixer_elem_info *cval,
949                                    int default_min, struct snd_kcontrol *kctl)
950 {
951         /* for failsafe */
952         cval->min = default_min;
953         cval->max = cval->min + 1;
954         cval->res = 1;
955         cval->dBmin = cval->dBmax = 0;
956 
957         if (cval->val_type == USB_MIXER_BOOLEAN ||
958             cval->val_type == USB_MIXER_INV_BOOLEAN) {
959                 cval->initialized = 1;
960         } else {
961                 int minchn = 0;
962                 if (cval->cmask) {
963                         int i;
964                         for (i = 0; i < MAX_CHANNELS; i++)
965                                 if (cval->cmask & (1 << i)) {
966                                         minchn = i + 1;
967                                         break;
968                                 }
969                 }
970                 if (get_ctl_value(cval, UAC_GET_MAX, (cval->control << 8) | minchn, &cval->max) < 0 ||
971                     get_ctl_value(cval, UAC_GET_MIN, (cval->control << 8) | minchn, &cval->min) < 0) {
972                         usb_audio_err(cval->mixer->chip,
973                                       "%d:%d: cannot get min/max values for control %d (id %d)\n",
974                                    cval->id, snd_usb_ctrl_intf(cval->mixer->chip),
975                                                                cval->control, cval->id);
976                         return -EINVAL;
977                 }
978                 if (get_ctl_value(cval, UAC_GET_RES,
979                                   (cval->control << 8) | minchn,
980                                   &cval->res) < 0) {
981                         cval->res = 1;
982                 } else {
983                         int last_valid_res = cval->res;
984 
985                         while (cval->res > 1) {
986                                 if (snd_usb_mixer_set_ctl_value(cval, UAC_SET_RES,
987                                                                 (cval->control << 8) | minchn,
988                                                                 cval->res / 2) < 0)
989                                         break;
990                                 cval->res /= 2;
991                         }
992                         if (get_ctl_value(cval, UAC_GET_RES,
993                                           (cval->control << 8) | minchn, &cval->res) < 0)
994                                 cval->res = last_valid_res;
995                 }
996                 if (cval->res == 0)
997                         cval->res = 1;
998 
999                 /* Additional checks for the proper resolution
1000                  *
1001                  * Some devices report smaller resolutions than actually
1002                  * reacting.  They don't return errors but simply clip
1003                  * to the lower aligned value.
1004                  */
1005                 if (cval->min + cval->res < cval->max) {
1006                         int last_valid_res = cval->res;
1007                         int saved, test, check;
1008                         get_cur_mix_raw(cval, minchn, &saved);
1009                         for (;;) {
1010                                 test = saved;
1011                                 if (test < cval->max)
1012                                         test += cval->res;
1013                                 else
1014                                         test -= cval->res;
1015                                 if (test < cval->min || test > cval->max ||
1016                                     set_cur_mix_value(cval, minchn, 0, test) ||
1017                                     get_cur_mix_raw(cval, minchn, &check)) {
1018                                         cval->res = last_valid_res;
1019                                         break;
1020                                 }
1021                                 if (test == check)
1022                                         break;
1023                                 cval->res *= 2;
1024                         }
1025                         set_cur_mix_value(cval, minchn, 0, saved);
1026                 }
1027 
1028                 cval->initialized = 1;
1029         }
1030 
1031         if (kctl)
1032                 volume_control_quirks(cval, kctl);
1033 
1034         /* USB descriptions contain the dB scale in 1/256 dB unit
1035          * while ALSA TLV contains in 1/100 dB unit
1036          */
1037         cval->dBmin = (convert_signed_value(cval, cval->min) * 100) / 256;
1038         cval->dBmax = (convert_signed_value(cval, cval->max) * 100) / 256;
1039         if (cval->dBmin > cval->dBmax) {
1040                 /* something is wrong; assume it's either from/to 0dB */
1041                 if (cval->dBmin < 0)
1042                         cval->dBmax = 0;
1043                 else if (cval->dBmin > 0)
1044                         cval->dBmin = 0;
1045                 if (cval->dBmin > cval->dBmax) {
1046                         /* totally crap, return an error */
1047                         return -EINVAL;
1048                 }
1049         }
1050 
1051         return 0;
1052 }
1053 
1054 #define get_min_max(cval, def)  get_min_max_with_quirks(cval, def, NULL)
1055 
1056 /* get a feature/mixer unit info */
1057 static int mixer_ctl_feature_info(struct snd_kcontrol *kcontrol,
1058                                   struct snd_ctl_elem_info *uinfo)
1059 {
1060         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1061 
1062         if (cval->val_type == USB_MIXER_BOOLEAN ||
1063             cval->val_type == USB_MIXER_INV_BOOLEAN)
1064                 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1065         else
1066                 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
1067         uinfo->count = cval->channels;
1068         if (cval->val_type == USB_MIXER_BOOLEAN ||
1069             cval->val_type == USB_MIXER_INV_BOOLEAN) {
1070                 uinfo->value.integer.min = 0;
1071                 uinfo->value.integer.max = 1;
1072         } else {
1073                 if (!cval->initialized) {
1074                         get_min_max_with_quirks(cval, 0, kcontrol);
1075                         if (cval->initialized && cval->dBmin >= cval->dBmax) {
1076                                 kcontrol->vd[0].access &= 
1077                                         ~(SNDRV_CTL_ELEM_ACCESS_TLV_READ |
1078                                           SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK);
1079                                 snd_ctl_notify(cval->mixer->chip->card,
1080                                                SNDRV_CTL_EVENT_MASK_INFO,
1081                                                &kcontrol->id);
1082                         }
1083                 }
1084                 uinfo->value.integer.min = 0;
1085                 uinfo->value.integer.max =
1086                         (cval->max - cval->min + cval->res - 1) / cval->res;
1087         }
1088         return 0;
1089 }
1090 
1091 /* get the current value from feature/mixer unit */
1092 static int mixer_ctl_feature_get(struct snd_kcontrol *kcontrol,
1093                                  struct snd_ctl_elem_value *ucontrol)
1094 {
1095         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1096         int c, cnt, val, err;
1097 
1098         ucontrol->value.integer.value[0] = cval->min;
1099         if (cval->cmask) {
1100                 cnt = 0;
1101                 for (c = 0; c < MAX_CHANNELS; c++) {
1102                         if (!(cval->cmask & (1 << c)))
1103                                 continue;
1104                         err = get_cur_mix_value(cval, c + 1, cnt, &val);
1105                         if (err < 0)
1106                                 return cval->mixer->ignore_ctl_error ? 0 : err;
1107                         val = get_relative_value(cval, val);
1108                         ucontrol->value.integer.value[cnt] = val;
1109                         cnt++;
1110                 }
1111                 return 0;
1112         } else {
1113                 /* master channel */
1114                 err = get_cur_mix_value(cval, 0, 0, &val);
1115                 if (err < 0)
1116                         return cval->mixer->ignore_ctl_error ? 0 : err;
1117                 val = get_relative_value(cval, val);
1118                 ucontrol->value.integer.value[0] = val;
1119         }
1120         return 0;
1121 }
1122 
1123 /* put the current value to feature/mixer unit */
1124 static int mixer_ctl_feature_put(struct snd_kcontrol *kcontrol,
1125                                  struct snd_ctl_elem_value *ucontrol)
1126 {
1127         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1128         int c, cnt, val, oval, err;
1129         int changed = 0;
1130 
1131         if (cval->cmask) {
1132                 cnt = 0;
1133                 for (c = 0; c < MAX_CHANNELS; c++) {
1134                         if (!(cval->cmask & (1 << c)))
1135                                 continue;
1136                         err = get_cur_mix_value(cval, c + 1, cnt, &oval);
1137                         if (err < 0)
1138                                 return cval->mixer->ignore_ctl_error ? 0 : err;
1139                         val = ucontrol->value.integer.value[cnt];
1140                         val = get_abs_value(cval, val);
1141                         if (oval != val) {
1142                                 set_cur_mix_value(cval, c + 1, cnt, val);
1143                                 changed = 1;
1144                         }
1145                         cnt++;
1146                 }
1147         } else {
1148                 /* master channel */
1149                 err = get_cur_mix_value(cval, 0, 0, &oval);
1150                 if (err < 0)
1151                         return cval->mixer->ignore_ctl_error ? 0 : err;
1152                 val = ucontrol->value.integer.value[0];
1153                 val = get_abs_value(cval, val);
1154                 if (val != oval) {
1155                         set_cur_mix_value(cval, 0, 0, val);
1156                         changed = 1;
1157                 }
1158         }
1159         return changed;
1160 }
1161 
1162 static struct snd_kcontrol_new usb_feature_unit_ctl = {
1163         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1164         .name = "", /* will be filled later manually */
1165         .info = mixer_ctl_feature_info,
1166         .get = mixer_ctl_feature_get,
1167         .put = mixer_ctl_feature_put,
1168 };
1169 
1170 /* the read-only variant */
1171 static struct snd_kcontrol_new usb_feature_unit_ctl_ro = {
1172         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1173         .name = "", /* will be filled later manually */
1174         .info = mixer_ctl_feature_info,
1175         .get = mixer_ctl_feature_get,
1176         .put = NULL,
1177 };
1178 
1179 /*
1180  * This symbol is exported in order to allow the mixer quirks to
1181  * hook up to the standard feature unit control mechanism
1182  */
1183 struct snd_kcontrol_new *snd_usb_feature_unit_ctl = &usb_feature_unit_ctl;
1184 
1185 /*
1186  * build a feature control
1187  */
1188 static size_t append_ctl_name(struct snd_kcontrol *kctl, const char *str)
1189 {
1190         return strlcat(kctl->id.name, str, sizeof(kctl->id.name));
1191 }
1192 
1193 /*
1194  * A lot of headsets/headphones have a "Speaker" mixer. Make sure we
1195  * rename it to "Headphone". We determine if something is a headphone
1196  * similar to how udev determines form factor.
1197  */
1198 static void check_no_speaker_on_headset(struct snd_kcontrol *kctl,
1199                                         struct snd_card *card)
1200 {
1201         const char *names_to_check[] = {
1202                 "Headset", "headset", "Headphone", "headphone", NULL};
1203         const char **s;
1204         bool found = false;
1205 
1206         if (strcmp("Speaker", kctl->id.name))
1207                 return;
1208 
1209         for (s = names_to_check; *s; s++)
1210                 if (strstr(card->shortname, *s)) {
1211                         found = true;
1212                         break;
1213                 }
1214 
1215         if (!found)
1216                 return;
1217 
1218         strlcpy(kctl->id.name, "Headphone", sizeof(kctl->id.name));
1219 }
1220 
1221 static void build_feature_ctl(struct mixer_build *state, void *raw_desc,
1222                               unsigned int ctl_mask, int control,
1223                               struct usb_audio_term *iterm, int unitid,
1224                               int readonly_mask)
1225 {
1226         struct uac_feature_unit_descriptor *desc = raw_desc;
1227         unsigned int len = 0;
1228         int mapped_name = 0;
1229         int nameid = uac_feature_unit_iFeature(desc);
1230         struct snd_kcontrol *kctl;
1231         struct usb_mixer_elem_info *cval;
1232         const struct usbmix_name_map *map;
1233         unsigned int range;
1234 
1235         control++; /* change from zero-based to 1-based value */
1236 
1237         if (control == UAC_FU_GRAPHIC_EQUALIZER) {
1238                 /* FIXME: not supported yet */
1239                 return;
1240         }
1241 
1242         map = find_map(state, unitid, control);
1243         if (check_ignored_ctl(map))
1244                 return;
1245 
1246         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1247         if (!cval)
1248                 return;
1249         cval->mixer = state->mixer;
1250         cval->id = unitid;
1251         cval->control = control;
1252         cval->cmask = ctl_mask;
1253         cval->val_type = audio_feature_info[control-1].type;
1254         if (ctl_mask == 0) {
1255                 cval->channels = 1;     /* master channel */
1256                 cval->master_readonly = readonly_mask;
1257         } else {
1258                 int i, c = 0;
1259                 for (i = 0; i < 16; i++)
1260                         if (ctl_mask & (1 << i))
1261                                 c++;
1262                 cval->channels = c;
1263                 cval->ch_readonly = readonly_mask;
1264         }
1265 
1266         /*
1267          * If all channels in the mask are marked read-only, make the control
1268          * read-only. set_cur_mix_value() will check the mask again and won't
1269          * issue write commands to read-only channels.
1270          */
1271         if (cval->channels == readonly_mask)
1272                 kctl = snd_ctl_new1(&usb_feature_unit_ctl_ro, cval);
1273         else
1274                 kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
1275 
1276         if (!kctl) {
1277                 usb_audio_err(state->chip, "cannot malloc kcontrol\n");
1278                 kfree(cval);
1279                 return;
1280         }
1281         kctl->private_free = usb_mixer_elem_free;
1282 
1283         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
1284         mapped_name = len != 0;
1285         if (!len && nameid)
1286                 len = snd_usb_copy_string_desc(state, nameid,
1287                                 kctl->id.name, sizeof(kctl->id.name));
1288 
1289         switch (control) {
1290         case UAC_FU_MUTE:
1291         case UAC_FU_VOLUME:
1292                 /*
1293                  * determine the control name.  the rule is:
1294                  * - if a name id is given in descriptor, use it.
1295                  * - if the connected input can be determined, then use the name
1296                  *   of terminal type.
1297                  * - if the connected output can be determined, use it.
1298                  * - otherwise, anonymous name.
1299                  */
1300                 if (!len) {
1301                         len = get_term_name(state, iterm, kctl->id.name,
1302                                             sizeof(kctl->id.name), 1);
1303                         if (!len)
1304                                 len = get_term_name(state, &state->oterm,
1305                                                     kctl->id.name,
1306                                                     sizeof(kctl->id.name), 1);
1307                         if (!len)
1308                                 len = snprintf(kctl->id.name,
1309                                                sizeof(kctl->id.name),
1310                                                "Feature %d", unitid);
1311                 }
1312 
1313                 if (!mapped_name)
1314                         check_no_speaker_on_headset(kctl, state->mixer->chip->card);
1315 
1316                 /*
1317                  * determine the stream direction:
1318                  * if the connected output is USB stream, then it's likely a
1319                  * capture stream.  otherwise it should be playback (hopefully :)
1320                  */
1321                 if (!mapped_name && !(state->oterm.type >> 16)) {
1322                         if ((state->oterm.type & 0xff00) == 0x0100)
1323                                 len = append_ctl_name(kctl, " Capture");
1324                         else
1325                                 len = append_ctl_name(kctl, " Playback");
1326                 }
1327                 append_ctl_name(kctl, control == UAC_FU_MUTE ?
1328                                 " Switch" : " Volume");
1329                 break;
1330         default:
1331                 if (!len)
1332                         strlcpy(kctl->id.name, audio_feature_info[control-1].name,
1333                                 sizeof(kctl->id.name));
1334                 break;
1335         }
1336 
1337         /* get min/max values */
1338         get_min_max_with_quirks(cval, 0, kctl);
1339 
1340         if (control == UAC_FU_VOLUME) {
1341                 check_mapped_dB(map, cval);
1342                 if (cval->dBmin < cval->dBmax || !cval->initialized) {
1343                         kctl->tlv.c = snd_usb_mixer_vol_tlv;
1344                         kctl->vd[0].access |=
1345                                 SNDRV_CTL_ELEM_ACCESS_TLV_READ |
1346                                 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
1347                 }
1348         }
1349 
1350         snd_usb_mixer_fu_apply_quirk(state->mixer, cval, unitid, kctl);
1351 
1352         range = (cval->max - cval->min) / cval->res;
1353         /*
1354          * Are there devices with volume range more than 255? I use a bit more
1355          * to be sure. 384 is a resolution magic number found on Logitech
1356          * devices. It will definitively catch all buggy Logitech devices.
1357          */
1358         if (range > 384) {
1359                 usb_audio_warn(state->chip,
1360                                "Warning! Unlikely big volume range (=%u), cval->res is probably wrong.",
1361                                range);
1362                 usb_audio_warn(state->chip,
1363                                "[%d] FU [%s] ch = %d, val = %d/%d/%d",
1364                                cval->id, kctl->id.name, cval->channels,
1365                                cval->min, cval->max, cval->res);
1366         }
1367 
1368         usb_audio_dbg(state->chip, "[%d] FU [%s] ch = %d, val = %d/%d/%d\n",
1369                       cval->id, kctl->id.name, cval->channels,
1370                       cval->min, cval->max, cval->res);
1371         snd_usb_mixer_add_control(state->mixer, kctl);
1372 }
1373 
1374 /*
1375  * parse a feature unit
1376  *
1377  * most of controls are defined here.
1378  */
1379 static int parse_audio_feature_unit(struct mixer_build *state, int unitid,
1380                                     void *_ftr)
1381 {
1382         int channels, i, j;
1383         struct usb_audio_term iterm;
1384         unsigned int master_bits, first_ch_bits;
1385         int err, csize;
1386         struct uac_feature_unit_descriptor *hdr = _ftr;
1387         __u8 *bmaControls;
1388 
1389         if (state->mixer->protocol == UAC_VERSION_1) {
1390                 if (hdr->bLength < 7) {
1391                         usb_audio_err(state->chip,
1392                                       "unit %u: invalid UAC_FEATURE_UNIT descriptor\n",
1393                                       unitid);
1394                         return -EINVAL;
1395                 }
1396                 csize = hdr->bControlSize;
1397                 if (!csize) {
1398                         usb_audio_dbg(state->chip,
1399                                       "unit %u: invalid bControlSize == 0\n",
1400                                       unitid);
1401                         return -EINVAL;
1402                 }
1403                 channels = (hdr->bLength - 7) / csize - 1;
1404                 bmaControls = hdr->bmaControls;
1405                 if (hdr->bLength < 7 + csize) {
1406                         usb_audio_err(state->chip,
1407                                       "unit %u: invalid UAC_FEATURE_UNIT descriptor\n",
1408                                       unitid);
1409                         return -EINVAL;
1410                 }
1411         } else {
1412                 struct uac2_feature_unit_descriptor *ftr = _ftr;
1413                 if (hdr->bLength < 6) {
1414                         usb_audio_err(state->chip,
1415                                       "unit %u: invalid UAC_FEATURE_UNIT descriptor\n",
1416                                       unitid);
1417                         return -EINVAL;
1418                 }
1419                 csize = 4;
1420                 channels = (hdr->bLength - 6) / 4 - 1;
1421                 bmaControls = ftr->bmaControls;
1422                 if (hdr->bLength < 6 + csize) {
1423                         usb_audio_err(state->chip,
1424                                       "unit %u: invalid UAC_FEATURE_UNIT descriptor\n",
1425                                       unitid);
1426                         return -EINVAL;
1427                 }
1428         }
1429 
1430         /* parse the source unit */
1431         if ((err = parse_audio_unit(state, hdr->bSourceID)) < 0)
1432                 return err;
1433 
1434         /* determine the input source type and name */
1435         err = check_input_term(state, hdr->bSourceID, &iterm);
1436         if (err < 0)
1437                 return err;
1438 
1439         master_bits = snd_usb_combine_bytes(bmaControls, csize);
1440         /* master configuration quirks */
1441         switch (state->chip->usb_id) {
1442         case USB_ID(0x08bb, 0x2702):
1443                 usb_audio_info(state->chip,
1444                                "usbmixer: master volume quirk for PCM2702 chip\n");
1445                 /* disable non-functional volume control */
1446                 master_bits &= ~UAC_CONTROL_BIT(UAC_FU_VOLUME);
1447                 break;
1448         case USB_ID(0x1130, 0xf211):
1449                 usb_audio_info(state->chip,
1450                                "usbmixer: volume control quirk for Tenx TP6911 Audio Headset\n");
1451                 /* disable non-functional volume control */
1452                 channels = 0;
1453                 break;
1454 
1455         }
1456         if (channels > 0)
1457                 first_ch_bits = snd_usb_combine_bytes(bmaControls + csize, csize);
1458         else
1459                 first_ch_bits = 0;
1460 
1461         if (state->mixer->protocol == UAC_VERSION_1) {
1462                 /* check all control types */
1463                 for (i = 0; i < 10; i++) {
1464                         unsigned int ch_bits = 0;
1465                         for (j = 0; j < channels; j++) {
1466                                 unsigned int mask;
1467 
1468                                 mask = snd_usb_combine_bytes(bmaControls +
1469                                                              csize * (j+1), csize);
1470                                 if (mask & (1 << i))
1471                                         ch_bits |= (1 << j);
1472                         }
1473                         /* audio class v1 controls are never read-only */
1474 
1475                         /*
1476                          * The first channel must be set
1477                          * (for ease of programming).
1478                          */
1479                         if (ch_bits & 1)
1480                                 build_feature_ctl(state, _ftr, ch_bits, i,
1481                                                   &iterm, unitid, 0);
1482                         if (master_bits & (1 << i))
1483                                 build_feature_ctl(state, _ftr, 0, i, &iterm,
1484                                                   unitid, 0);
1485                 }
1486         } else { /* UAC_VERSION_2 */
1487                 for (i = 0; i < ARRAY_SIZE(audio_feature_info); i++) {
1488                         unsigned int ch_bits = 0;
1489                         unsigned int ch_read_only = 0;
1490 
1491                         for (j = 0; j < channels; j++) {
1492                                 unsigned int mask;
1493 
1494                                 mask = snd_usb_combine_bytes(bmaControls +
1495                                                              csize * (j+1), csize);
1496                                 if (uac2_control_is_readable(mask, i)) {
1497                                         ch_bits |= (1 << j);
1498                                         if (!uac2_control_is_writeable(mask, i))
1499                                                 ch_read_only |= (1 << j);
1500                                 }
1501                         }
1502 
1503                         /*
1504                          * NOTE: build_feature_ctl() will mark the control
1505                          * read-only if all channels are marked read-only in
1506                          * the descriptors. Otherwise, the control will be
1507                          * reported as writeable, but the driver will not
1508                          * actually issue a write command for read-only
1509                          * channels.
1510                          */
1511 
1512                         /*
1513                          * The first channel must be set
1514                          * (for ease of programming).
1515                          */
1516                         if (ch_bits & 1)
1517                                 build_feature_ctl(state, _ftr, ch_bits, i,
1518                                                   &iterm, unitid, ch_read_only);
1519                         if (uac2_control_is_readable(master_bits, i))
1520                                 build_feature_ctl(state, _ftr, 0, i, &iterm, unitid,
1521                                                   !uac2_control_is_writeable(master_bits, i));
1522                 }
1523         }
1524 
1525         return 0;
1526 }
1527 
1528 /*
1529  * Mixer Unit
1530  */
1531 
1532 /*
1533  * build a mixer unit control
1534  *
1535  * the callbacks are identical with feature unit.
1536  * input channel number (zero based) is given in control field instead.
1537  */
1538 static void build_mixer_unit_ctl(struct mixer_build *state,
1539                                  struct uac_mixer_unit_descriptor *desc,
1540                                  int in_pin, int in_ch, int unitid,
1541                                  struct usb_audio_term *iterm)
1542 {
1543         struct usb_mixer_elem_info *cval;
1544         unsigned int num_outs = uac_mixer_unit_bNrChannels(desc);
1545         unsigned int i, len;
1546         struct snd_kcontrol *kctl;
1547         const struct usbmix_name_map *map;
1548 
1549         map = find_map(state, unitid, 0);
1550         if (check_ignored_ctl(map))
1551                 return;
1552 
1553         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1554         if (!cval)
1555                 return;
1556 
1557         cval->mixer = state->mixer;
1558         cval->id = unitid;
1559         cval->control = in_ch + 1; /* based on 1 */
1560         cval->val_type = USB_MIXER_S16;
1561         for (i = 0; i < num_outs; i++) {
1562                 __u8 *c = uac_mixer_unit_bmControls(desc, state->mixer->protocol);
1563 
1564                 if (check_matrix_bitmap(c, in_ch, i, num_outs)) {
1565                         cval->cmask |= (1 << i);
1566                         cval->channels++;
1567                 }
1568         }
1569 
1570         /* get min/max values */
1571         get_min_max(cval, 0);
1572 
1573         kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
1574         if (!kctl) {
1575                 usb_audio_err(state->chip, "cannot malloc kcontrol\n");
1576                 kfree(cval);
1577                 return;
1578         }
1579         kctl->private_free = usb_mixer_elem_free;
1580 
1581         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
1582         if (!len)
1583                 len = get_term_name(state, iterm, kctl->id.name,
1584                                     sizeof(kctl->id.name), 0);
1585         if (!len)
1586                 len = sprintf(kctl->id.name, "Mixer Source %d", in_ch + 1);
1587         append_ctl_name(kctl, " Volume");
1588 
1589         usb_audio_dbg(state->chip, "[%d] MU [%s] ch = %d, val = %d/%d\n",
1590                     cval->id, kctl->id.name, cval->channels, cval->min, cval->max);
1591         snd_usb_mixer_add_control(state->mixer, kctl);
1592 }
1593 
1594 /*
1595  * parse a mixer unit
1596  */
1597 static int parse_audio_mixer_unit(struct mixer_build *state, int unitid,
1598                                   void *raw_desc)
1599 {
1600         struct uac_mixer_unit_descriptor *desc = raw_desc;
1601         struct usb_audio_term iterm;
1602         int input_pins, num_ins, num_outs;
1603         int pin, ich, err;
1604 
1605         if (desc->bLength < 11 || !(input_pins = desc->bNrInPins) ||
1606             !(num_outs = uac_mixer_unit_bNrChannels(desc))) {
1607                 usb_audio_err(state->chip,
1608                               "invalid MIXER UNIT descriptor %d\n",
1609                               unitid);
1610                 return -EINVAL;
1611         }
1612         /* no bmControls field (e.g. Maya44) -> ignore */
1613         if (desc->bLength <= 10 + input_pins) {
1614                 usb_audio_dbg(state->chip, "MU %d has no bmControls field\n",
1615                               unitid);
1616                 return 0;
1617         }
1618 
1619         num_ins = 0;
1620         ich = 0;
1621         for (pin = 0; pin < input_pins; pin++) {
1622                 err = parse_audio_unit(state, desc->baSourceID[pin]);
1623                 if (err < 0)
1624                         continue;
1625                 err = check_input_term(state, desc->baSourceID[pin], &iterm);
1626                 if (err < 0)
1627                         return err;
1628                 num_ins += iterm.channels;
1629                 for (; ich < num_ins; ich++) {
1630                         int och, ich_has_controls = 0;
1631 
1632                         for (och = 0; och < num_outs; och++) {
1633                                 __u8 *c = uac_mixer_unit_bmControls(desc,
1634                                                 state->mixer->protocol);
1635 
1636                                 if (check_matrix_bitmap(c, ich, och, num_outs)) {
1637                                         ich_has_controls = 1;
1638                                         break;
1639                                 }
1640                         }
1641                         if (ich_has_controls)
1642                                 build_mixer_unit_ctl(state, desc, pin, ich,
1643                                                      unitid, &iterm);
1644                 }
1645         }
1646         return 0;
1647 }
1648 
1649 /*
1650  * Processing Unit / Extension Unit
1651  */
1652 
1653 /* get callback for processing/extension unit */
1654 static int mixer_ctl_procunit_get(struct snd_kcontrol *kcontrol,
1655                                   struct snd_ctl_elem_value *ucontrol)
1656 {
1657         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1658         int err, val;
1659 
1660         err = get_cur_ctl_value(cval, cval->control << 8, &val);
1661         if (err < 0 && cval->mixer->ignore_ctl_error) {
1662                 ucontrol->value.integer.value[0] = cval->min;
1663                 return 0;
1664         }
1665         if (err < 0)
1666                 return err;
1667         val = get_relative_value(cval, val);
1668         ucontrol->value.integer.value[0] = val;
1669         return 0;
1670 }
1671 
1672 /* put callback for processing/extension unit */
1673 static int mixer_ctl_procunit_put(struct snd_kcontrol *kcontrol,
1674                                   struct snd_ctl_elem_value *ucontrol)
1675 {
1676         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1677         int val, oval, err;
1678 
1679         err = get_cur_ctl_value(cval, cval->control << 8, &oval);
1680         if (err < 0) {
1681                 if (cval->mixer->ignore_ctl_error)
1682                         return 0;
1683                 return err;
1684         }
1685         val = ucontrol->value.integer.value[0];
1686         val = get_abs_value(cval, val);
1687         if (val != oval) {
1688                 set_cur_ctl_value(cval, cval->control << 8, val);
1689                 return 1;
1690         }
1691         return 0;
1692 }
1693 
1694 /* alsa control interface for processing/extension unit */
1695 static struct snd_kcontrol_new mixer_procunit_ctl = {
1696         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1697         .name = "", /* will be filled later */
1698         .info = mixer_ctl_feature_info,
1699         .get = mixer_ctl_procunit_get,
1700         .put = mixer_ctl_procunit_put,
1701 };
1702 
1703 /*
1704  * predefined data for processing units
1705  */
1706 struct procunit_value_info {
1707         int control;
1708         char *suffix;
1709         int val_type;
1710         int min_value;
1711 };
1712 
1713 struct procunit_info {
1714         int type;
1715         char *name;
1716         struct procunit_value_info *values;
1717 };
1718 
1719 static struct procunit_value_info updown_proc_info[] = {
1720         { UAC_UD_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1721         { UAC_UD_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
1722         { 0 }
1723 };
1724 static struct procunit_value_info prologic_proc_info[] = {
1725         { UAC_DP_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1726         { UAC_DP_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
1727         { 0 }
1728 };
1729 static struct procunit_value_info threed_enh_proc_info[] = {
1730         { UAC_3D_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1731         { UAC_3D_SPACE, "Spaciousness", USB_MIXER_U8 },
1732         { 0 }
1733 };
1734 static struct procunit_value_info reverb_proc_info[] = {
1735         { UAC_REVERB_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1736         { UAC_REVERB_LEVEL, "Level", USB_MIXER_U8 },
1737         { UAC_REVERB_TIME, "Time", USB_MIXER_U16 },
1738         { UAC_REVERB_FEEDBACK, "Feedback", USB_MIXER_U8 },
1739         { 0 }
1740 };
1741 static struct procunit_value_info chorus_proc_info[] = {
1742         { UAC_CHORUS_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1743         { UAC_CHORUS_LEVEL, "Level", USB_MIXER_U8 },
1744         { UAC_CHORUS_RATE, "Rate", USB_MIXER_U16 },
1745         { UAC_CHORUS_DEPTH, "Depth", USB_MIXER_U16 },
1746         { 0 }
1747 };
1748 static struct procunit_value_info dcr_proc_info[] = {
1749         { UAC_DCR_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1750         { UAC_DCR_RATE, "Ratio", USB_MIXER_U16 },
1751         { UAC_DCR_MAXAMPL, "Max Amp", USB_MIXER_S16 },
1752         { UAC_DCR_THRESHOLD, "Threshold", USB_MIXER_S16 },
1753         { UAC_DCR_ATTACK_TIME, "Attack Time", USB_MIXER_U16 },
1754         { UAC_DCR_RELEASE_TIME, "Release Time", USB_MIXER_U16 },
1755         { 0 }
1756 };
1757 
1758 static struct procunit_info procunits[] = {
1759         { UAC_PROCESS_UP_DOWNMIX, "Up Down", updown_proc_info },
1760         { UAC_PROCESS_DOLBY_PROLOGIC, "Dolby Prologic", prologic_proc_info },
1761         { UAC_PROCESS_STEREO_EXTENDER, "3D Stereo Extender", threed_enh_proc_info },
1762         { UAC_PROCESS_REVERB, "Reverb", reverb_proc_info },
1763         { UAC_PROCESS_CHORUS, "Chorus", chorus_proc_info },
1764         { UAC_PROCESS_DYN_RANGE_COMP, "DCR", dcr_proc_info },
1765         { 0 },
1766 };
1767 /*
1768  * predefined data for extension units
1769  */
1770 static struct procunit_value_info clock_rate_xu_info[] = {
1771         { USB_XU_CLOCK_RATE_SELECTOR, "Selector", USB_MIXER_U8, 0 },
1772         { 0 }
1773 };
1774 static struct procunit_value_info clock_source_xu_info[] = {
1775         { USB_XU_CLOCK_SOURCE_SELECTOR, "External", USB_MIXER_BOOLEAN },
1776         { 0 }
1777 };
1778 static struct procunit_value_info spdif_format_xu_info[] = {
1779         { USB_XU_DIGITAL_FORMAT_SELECTOR, "SPDIF/AC3", USB_MIXER_BOOLEAN },
1780         { 0 }
1781 };
1782 static struct procunit_value_info soft_limit_xu_info[] = {
1783         { USB_XU_SOFT_LIMIT_SELECTOR, " ", USB_MIXER_BOOLEAN },
1784         { 0 }
1785 };
1786 static struct procunit_info extunits[] = {
1787         { USB_XU_CLOCK_RATE, "Clock rate", clock_rate_xu_info },
1788         { USB_XU_CLOCK_SOURCE, "DigitalIn CLK source", clock_source_xu_info },
1789         { USB_XU_DIGITAL_IO_STATUS, "DigitalOut format:", spdif_format_xu_info },
1790         { USB_XU_DEVICE_OPTIONS, "AnalogueIn Soft Limit", soft_limit_xu_info },
1791         { 0 }
1792 };
1793 
1794 /*
1795  * build a processing/extension unit
1796  */
1797 static int build_audio_procunit(struct mixer_build *state, int unitid,
1798                                 void *raw_desc, struct procunit_info *list,
1799                                 char *name)
1800 {
1801         struct uac_processing_unit_descriptor *desc = raw_desc;
1802         int num_ins;
1803         struct usb_mixer_elem_info *cval;
1804         struct snd_kcontrol *kctl;
1805         int i, err, nameid, type, len;
1806         struct procunit_info *info;
1807         struct procunit_value_info *valinfo;
1808         const struct usbmix_name_map *map;
1809         static struct procunit_value_info default_value_info[] = {
1810                 { 0x01, "Switch", USB_MIXER_BOOLEAN },
1811                 { 0 }
1812         };
1813         static struct procunit_info default_info = {
1814                 0, NULL, default_value_info
1815         };
1816 
1817         if (desc->bLength < 13) {
1818                 usb_audio_err(state->chip, "invalid %s descriptor (id %d)\n", name, unitid);
1819                 return -EINVAL;
1820         }
1821 
1822         num_ins = desc->bNrInPins;
1823         if (desc->bLength < 13 + num_ins ||
1824             desc->bLength < num_ins + uac_processing_unit_bControlSize(desc, state->mixer->protocol)) {
1825                 usb_audio_err(state->chip, "invalid %s descriptor (id %d)\n", name, unitid);
1826                 return -EINVAL;
1827         }
1828 
1829         for (i = 0; i < num_ins; i++) {
1830                 if ((err = parse_audio_unit(state, desc->baSourceID[i])) < 0)
1831                         return err;
1832         }
1833 
1834         type = le16_to_cpu(desc->wProcessType);
1835         for (info = list; info && info->type; info++)
1836                 if (info->type == type)
1837                         break;
1838         if (!info || !info->type)
1839                 info = &default_info;
1840 
1841         for (valinfo = info->values; valinfo->control; valinfo++) {
1842                 __u8 *controls = uac_processing_unit_bmControls(desc, state->mixer->protocol);
1843 
1844                 if (!(controls[valinfo->control / 8] & (1 << ((valinfo->control % 8) - 1))))
1845                         continue;
1846                 map = find_map(state, unitid, valinfo->control);
1847                 if (check_ignored_ctl(map))
1848                         continue;
1849                 cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1850                 if (!cval)
1851                         return -ENOMEM;
1852                 cval->mixer = state->mixer;
1853                 cval->id = unitid;
1854                 cval->control = valinfo->control;
1855                 cval->val_type = valinfo->val_type;
1856                 cval->channels = 1;
1857 
1858                 /* get min/max values */
1859                 if (type == UAC_PROCESS_UP_DOWNMIX && cval->control == UAC_UD_MODE_SELECT) {
1860                         __u8 *control_spec = uac_processing_unit_specific(desc, state->mixer->protocol);
1861                         /* FIXME: hard-coded */
1862                         cval->min = 1;
1863                         cval->max = control_spec[0];
1864                         cval->res = 1;
1865                         cval->initialized = 1;
1866                 } else {
1867                         if (type == USB_XU_CLOCK_RATE) {
1868                                 /*
1869                                  * E-Mu USB 0404/0202/TrackerPre/0204
1870                                  * samplerate control quirk
1871                                  */
1872                                 cval->min = 0;
1873                                 cval->max = 5;
1874                                 cval->res = 1;
1875                                 cval->initialized = 1;
1876                         } else
1877                                 get_min_max(cval, valinfo->min_value);
1878                 }
1879 
1880                 kctl = snd_ctl_new1(&mixer_procunit_ctl, cval);
1881                 if (!kctl) {
1882                         kfree(cval);
1883                         return -ENOMEM;
1884                 }
1885                 kctl->private_free = usb_mixer_elem_free;
1886 
1887                 if (check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name))) {
1888                         /* nothing */ ;
1889                 } else if (info->name) {
1890                         strlcpy(kctl->id.name, info->name, sizeof(kctl->id.name));
1891                 } else {
1892                         nameid = uac_processing_unit_iProcessing(desc, state->mixer->protocol);
1893                         len = 0;
1894                         if (nameid)
1895                                 len = snd_usb_copy_string_desc(state, nameid,
1896                                                                kctl->id.name,
1897                                                                sizeof(kctl->id.name));
1898                         if (!len)
1899                                 strlcpy(kctl->id.name, name, sizeof(kctl->id.name));
1900                 }
1901                 append_ctl_name(kctl, " ");
1902                 append_ctl_name(kctl, valinfo->suffix);
1903 
1904                 usb_audio_dbg(state->chip,
1905                               "[%d] PU [%s] ch = %d, val = %d/%d\n",
1906                               cval->id, kctl->id.name, cval->channels,
1907                               cval->min, cval->max);
1908 
1909                 err = snd_usb_mixer_add_control(state->mixer, kctl);
1910                 if (err < 0)
1911                         return err;
1912         }
1913         return 0;
1914 }
1915 
1916 static int parse_audio_processing_unit(struct mixer_build *state, int unitid,
1917                                        void *raw_desc)
1918 {
1919         return build_audio_procunit(state, unitid, raw_desc,
1920                                     procunits, "Processing Unit");
1921 }
1922 
1923 static int parse_audio_extension_unit(struct mixer_build *state, int unitid,
1924                                       void *raw_desc)
1925 {
1926         /*
1927          * Note that we parse extension units with processing unit descriptors.
1928          * That's ok as the layout is the same.
1929          */
1930         return build_audio_procunit(state, unitid, raw_desc,
1931                                     extunits, "Extension Unit");
1932 }
1933 
1934 /*
1935  * Selector Unit
1936  */
1937 
1938 /*
1939  * info callback for selector unit
1940  * use an enumerator type for routing
1941  */
1942 static int mixer_ctl_selector_info(struct snd_kcontrol *kcontrol,
1943                                    struct snd_ctl_elem_info *uinfo)
1944 {
1945         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1946         const char **itemlist = (const char **)kcontrol->private_value;
1947 
1948         if (snd_BUG_ON(!itemlist))
1949                 return -EINVAL;
1950         return snd_ctl_enum_info(uinfo, 1, cval->max, itemlist);
1951 }
1952 
1953 /* get callback for selector unit */
1954 static int mixer_ctl_selector_get(struct snd_kcontrol *kcontrol,
1955                                   struct snd_ctl_elem_value *ucontrol)
1956 {
1957         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1958         int val, err;
1959 
1960         err = get_cur_ctl_value(cval, cval->control << 8, &val);
1961         if (err < 0) {
1962                 if (cval->mixer->ignore_ctl_error) {
1963                         ucontrol->value.enumerated.item[0] = 0;
1964                         return 0;
1965                 }
1966                 return err;
1967         }
1968         val = get_relative_value(cval, val);
1969         ucontrol->value.enumerated.item[0] = val;
1970         return 0;
1971 }
1972 
1973 /* put callback for selector unit */
1974 static int mixer_ctl_selector_put(struct snd_kcontrol *kcontrol,
1975                                   struct snd_ctl_elem_value *ucontrol)
1976 {
1977         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1978         int val, oval, err;
1979 
1980         err = get_cur_ctl_value(cval, cval->control << 8, &oval);
1981         if (err < 0) {
1982                 if (cval->mixer->ignore_ctl_error)
1983                         return 0;
1984                 return err;
1985         }
1986         val = ucontrol->value.enumerated.item[0];
1987         val = get_abs_value(cval, val);
1988         if (val != oval) {
1989                 set_cur_ctl_value(cval, cval->control << 8, val);
1990                 return 1;
1991         }
1992         return 0;
1993 }
1994 
1995 /* alsa control interface for selector unit */
1996 static struct snd_kcontrol_new mixer_selectunit_ctl = {
1997         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1998         .name = "", /* will be filled later */
1999         .info = mixer_ctl_selector_info,
2000         .get = mixer_ctl_selector_get,
2001         .put = mixer_ctl_selector_put,
2002 };
2003 
2004 /*
2005  * private free callback.
2006  * free both private_data and private_value
2007  */
2008 static void usb_mixer_selector_elem_free(struct snd_kcontrol *kctl)
2009 {
2010         int i, num_ins = 0;
2011 
2012         if (kctl->private_data) {
2013                 struct usb_mixer_elem_info *cval = kctl->private_data;
2014                 num_ins = cval->max;
2015                 kfree(cval);
2016                 kctl->private_data = NULL;
2017         }
2018         if (kctl->private_value) {
2019                 char **itemlist = (char **)kctl->private_value;
2020                 for (i = 0; i < num_ins; i++)
2021                         kfree(itemlist[i]);
2022                 kfree(itemlist);
2023                 kctl->private_value = 0;
2024         }
2025 }
2026 
2027 /*
2028  * parse a selector unit
2029  */
2030 static int parse_audio_selector_unit(struct mixer_build *state, int unitid,
2031                                      void *raw_desc)
2032 {
2033         struct uac_selector_unit_descriptor *desc = raw_desc;
2034         unsigned int i, nameid, len;
2035         int err;
2036         struct usb_mixer_elem_info *cval;
2037         struct snd_kcontrol *kctl;
2038         const struct usbmix_name_map *map;
2039         char **namelist;
2040 
2041         if (desc->bLength < 5 || !desc->bNrInPins ||
2042             desc->bLength < 5 + desc->bNrInPins) {
2043                 usb_audio_err(state->chip,
2044                         "invalid SELECTOR UNIT descriptor %d\n", unitid);
2045                 return -EINVAL;
2046         }
2047 
2048         for (i = 0; i < desc->bNrInPins; i++) {
2049                 if ((err = parse_audio_unit(state, desc->baSourceID[i])) < 0)
2050                         return err;
2051         }
2052 
2053         if (desc->bNrInPins == 1) /* only one ? nonsense! */
2054                 return 0;
2055 
2056         map = find_map(state, unitid, 0);
2057         if (check_ignored_ctl(map))
2058                 return 0;
2059 
2060         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
2061         if (!cval)
2062                 return -ENOMEM;
2063         cval->mixer = state->mixer;
2064         cval->id = unitid;
2065         cval->val_type = USB_MIXER_U8;
2066         cval->channels = 1;
2067         cval->min = 1;
2068         cval->max = desc->bNrInPins;
2069         cval->res = 1;
2070         cval->initialized = 1;
2071 
2072         if (state->mixer->protocol == UAC_VERSION_1)
2073                 cval->control = 0;
2074         else /* UAC_VERSION_2 */
2075                 cval->control = (desc->bDescriptorSubtype == UAC2_CLOCK_SELECTOR) ?
2076                         UAC2_CX_CLOCK_SELECTOR : UAC2_SU_SELECTOR;
2077 
2078         namelist = kmalloc(sizeof(char *) * desc->bNrInPins, GFP_KERNEL);
2079         if (!namelist) {
2080                 kfree(cval);
2081                 return -ENOMEM;
2082         }
2083 #define MAX_ITEM_NAME_LEN       64
2084         for (i = 0; i < desc->bNrInPins; i++) {
2085                 struct usb_audio_term iterm;
2086                 len = 0;
2087                 namelist[i] = kmalloc(MAX_ITEM_NAME_LEN, GFP_KERNEL);
2088                 if (!namelist[i]) {
2089                         while (i--)
2090                                 kfree(namelist[i]);
2091                         kfree(namelist);
2092                         kfree(cval);
2093                         return -ENOMEM;
2094                 }
2095                 len = check_mapped_selector_name(state, unitid, i, namelist[i],
2096                                                  MAX_ITEM_NAME_LEN);
2097                 if (! len && check_input_term(state, desc->baSourceID[i], &iterm) >= 0)
2098                         len = get_term_name(state, &iterm, namelist[i], MAX_ITEM_NAME_LEN, 0);
2099                 if (! len)
2100                         sprintf(namelist[i], "Input %u", i);
2101         }
2102 
2103         kctl = snd_ctl_new1(&mixer_selectunit_ctl, cval);
2104         if (! kctl) {
2105                 usb_audio_err(state->chip, "cannot malloc kcontrol\n");
2106                 kfree(namelist);
2107                 kfree(cval);
2108                 return -ENOMEM;
2109         }
2110         kctl->private_value = (unsigned long)namelist;
2111         kctl->private_free = usb_mixer_selector_elem_free;
2112 
2113         /* check the static mapping table at first */
2114         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
2115         if (!len) {
2116                 /* no mapping ? */
2117                 /* if iSelector is given, use it */
2118                 nameid = uac_selector_unit_iSelector(desc);
2119                 if (nameid)
2120                         len = snd_usb_copy_string_desc(state, nameid,
2121                                                        kctl->id.name,
2122                                                        sizeof(kctl->id.name));
2123                 /* ... or pick up the terminal name at next */
2124                 if (!len)
2125                         len = get_term_name(state, &state->oterm,
2126                                     kctl->id.name, sizeof(kctl->id.name), 0);
2127                 /* ... or use the fixed string "USB" as the last resort */
2128                 if (!len)
2129                         strlcpy(kctl->id.name, "USB", sizeof(kctl->id.name));
2130 
2131                 /* and add the proper suffix */
2132                 if (desc->bDescriptorSubtype == UAC2_CLOCK_SELECTOR)
2133                         append_ctl_name(kctl, " Clock Source");
2134                 else if ((state->oterm.type & 0xff00) == 0x0100)
2135                         append_ctl_name(kctl, " Capture Source");
2136                 else
2137                         append_ctl_name(kctl, " Playback Source");
2138         }
2139 
2140         usb_audio_dbg(state->chip, "[%d] SU [%s] items = %d\n",
2141                     cval->id, kctl->id.name, desc->bNrInPins);
2142         if ((err = snd_usb_mixer_add_control(state->mixer, kctl)) < 0)
2143                 return err;
2144 
2145         return 0;
2146 }
2147 
2148 /*
2149  * parse an audio unit recursively
2150  */
2151 
2152 static int parse_audio_unit(struct mixer_build *state, int unitid)
2153 {
2154         unsigned char *p1;
2155 
2156         if (test_and_set_bit(unitid, state->unitbitmap))
2157                 return 0; /* the unit already visited */
2158 
2159         p1 = find_audio_control_unit(state, unitid);
2160         if (!p1) {
2161                 usb_audio_err(state->chip, "unit %d not found!\n", unitid);
2162                 return -EINVAL;
2163         }
2164 
2165         switch (p1[2]) {
2166         case UAC_INPUT_TERMINAL:
2167         case UAC2_CLOCK_SOURCE:
2168                 return 0; /* NOP */
2169         case UAC_MIXER_UNIT:
2170                 return parse_audio_mixer_unit(state, unitid, p1);
2171         case UAC_SELECTOR_UNIT:
2172         case UAC2_CLOCK_SELECTOR:
2173                 return parse_audio_selector_unit(state, unitid, p1);
2174         case UAC_FEATURE_UNIT:
2175                 return parse_audio_feature_unit(state, unitid, p1);
2176         case UAC1_PROCESSING_UNIT:
2177         /*   UAC2_EFFECT_UNIT has the same value */
2178                 if (state->mixer->protocol == UAC_VERSION_1)
2179                         return parse_audio_processing_unit(state, unitid, p1);
2180                 else
2181                         return 0; /* FIXME - effect units not implemented yet */
2182         case UAC1_EXTENSION_UNIT:
2183         /*   UAC2_PROCESSING_UNIT_V2 has the same value */
2184                 if (state->mixer->protocol == UAC_VERSION_1)
2185                         return parse_audio_extension_unit(state, unitid, p1);
2186                 else /* UAC_VERSION_2 */
2187                         return parse_audio_processing_unit(state, unitid, p1);
2188         case UAC2_EXTENSION_UNIT_V2:
2189                 return parse_audio_extension_unit(state, unitid, p1);
2190         default:
2191                 usb_audio_err(state->chip,
2192                         "unit %u: unexpected type 0x%02x\n", unitid, p1[2]);
2193                 return -EINVAL;
2194         }
2195 }
2196 
2197 static void snd_usb_mixer_free(struct usb_mixer_interface *mixer)
2198 {
2199         /* kill pending URBs */
2200         snd_usb_mixer_disconnect(&mixer->list);
2201 
2202         kfree(mixer->id_elems);
2203         if (mixer->urb) {
2204                 kfree(mixer->urb->transfer_buffer);
2205                 usb_free_urb(mixer->urb);
2206         }
2207         usb_free_urb(mixer->rc_urb);
2208         kfree(mixer->rc_setup_packet);
2209         kfree(mixer);
2210 }
2211 
2212 static int snd_usb_mixer_dev_free(struct snd_device *device)
2213 {
2214         struct usb_mixer_interface *mixer = device->device_data;
2215         snd_usb_mixer_free(mixer);
2216         return 0;
2217 }
2218 
2219 /*
2220  * create mixer controls
2221  *
2222  * walk through all UAC_OUTPUT_TERMINAL descriptors to search for mixers
2223  */
2224 static int snd_usb_mixer_controls(struct usb_mixer_interface *mixer)
2225 {
2226         struct mixer_build state;
2227         int err;
2228         const struct usbmix_ctl_map *map;
2229         void *p;
2230 
2231         memset(&state, 0, sizeof(state));
2232         state.chip = mixer->chip;
2233         state.mixer = mixer;
2234         state.buffer = mixer->hostif->extra;
2235         state.buflen = mixer->hostif->extralen;
2236 
2237         /* check the mapping table */
2238         for (map = usbmix_ctl_maps; map->id; map++) {
2239                 if (map->id == state.chip->usb_id) {
2240                         state.map = map->map;
2241                         state.selector_map = map->selector_map;
2242                         mixer->ignore_ctl_error = map->ignore_ctl_error;
2243                         break;
2244                 }
2245         }
2246 
2247         p = NULL;
2248         while ((p = snd_usb_find_csint_desc(mixer->hostif->extra,
2249                                             mixer->hostif->extralen,
2250                                             p, UAC_OUTPUT_TERMINAL)) != NULL) {
2251                 if (mixer->protocol == UAC_VERSION_1) {
2252                         struct uac1_output_terminal_descriptor *desc = p;
2253 
2254                         if (desc->bLength < sizeof(*desc))
2255                                 continue; /* invalid descriptor? */
2256                         /* mark terminal ID as visited */
2257                         set_bit(desc->bTerminalID, state.unitbitmap);
2258                         state.oterm.id = desc->bTerminalID;
2259                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
2260                         state.oterm.name = desc->iTerminal;
2261                         err = parse_audio_unit(&state, desc->bSourceID);
2262                         if (err < 0 && err != -EINVAL)
2263                                 return err;
2264                 } else { /* UAC_VERSION_2 */
2265                         struct uac2_output_terminal_descriptor *desc = p;
2266 
2267                         if (desc->bLength < sizeof(*desc))
2268                                 continue; /* invalid descriptor? */
2269                         /* mark terminal ID as visited */
2270                         set_bit(desc->bTerminalID, state.unitbitmap);
2271                         state.oterm.id = desc->bTerminalID;
2272                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
2273                         state.oterm.name = desc->iTerminal;
2274                         err = parse_audio_unit(&state, desc->bSourceID);
2275                         if (err < 0 && err != -EINVAL)
2276                                 return err;
2277 
2278                         /*
2279                          * For UAC2, use the same approach to also add the
2280                          * clock selectors
2281                          */
2282                         err = parse_audio_unit(&state, desc->bCSourceID);
2283                         if (err < 0 && err != -EINVAL)
2284                                 return err;
2285                 }
2286         }
2287 
2288         return 0;
2289 }
2290 
2291 void snd_usb_mixer_notify_id(struct usb_mixer_interface *mixer, int unitid)
2292 {
2293         struct usb_mixer_elem_info *info;
2294 
2295         for (info = mixer->id_elems[unitid]; info; info = info->next_id_elem)
2296                 snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
2297                                info->elem_id);
2298 }
2299 
2300 static void snd_usb_mixer_dump_cval(struct snd_info_buffer *buffer,
2301                                     int unitid,
2302                                     struct usb_mixer_elem_info *cval)
2303 {
2304         static char *val_types[] = {"BOOLEAN", "INV_BOOLEAN",
2305                                     "S8", "U8", "S16", "U16"};
2306         snd_iprintf(buffer, "  Unit: %i\n", unitid);
2307         if (cval->elem_id)
2308                 snd_iprintf(buffer, "    Control: name=\"%s\", index=%i\n",
2309                                 cval->elem_id->name, cval->elem_id->index);
2310         snd_iprintf(buffer, "    Info: id=%i, control=%i, cmask=0x%x, "
2311                             "channels=%i, type=\"%s\"\n", cval->id,
2312                             cval->control, cval->cmask, cval->channels,
2313                             val_types[cval->val_type]);
2314         snd_iprintf(buffer, "    Volume: min=%i, max=%i, dBmin=%i, dBmax=%i\n",
2315                             cval->min, cval->max, cval->dBmin, cval->dBmax);
2316 }
2317 
2318 static void snd_usb_mixer_proc_read(struct snd_info_entry *entry,
2319                                     struct snd_info_buffer *buffer)
2320 {
2321         struct snd_usb_audio *chip = entry->private_data;
2322         struct usb_mixer_interface *mixer;
2323         struct usb_mixer_elem_info *cval;
2324         int unitid;
2325 
2326         list_for_each_entry(mixer, &chip->mixer_list, list) {
2327                 snd_iprintf(buffer,
2328                         "USB Mixer: usb_id=0x%08x, ctrlif=%i, ctlerr=%i\n",
2329                                 chip->usb_id, snd_usb_ctrl_intf(chip),
2330                                 mixer->ignore_ctl_error);
2331                 snd_iprintf(buffer, "Card: %s\n", chip->card->longname);
2332                 for (unitid = 0; unitid < MAX_ID_ELEMS; unitid++) {
2333                         for (cval = mixer->id_elems[unitid]; cval;
2334                                                 cval = cval->next_id_elem)
2335                                 snd_usb_mixer_dump_cval(buffer, unitid, cval);
2336                 }
2337         }
2338 }
2339 
2340 static void snd_usb_mixer_interrupt_v2(struct usb_mixer_interface *mixer,
2341                                        int attribute, int value, int index)
2342 {
2343         struct usb_mixer_elem_info *info;
2344         __u8 unitid = (index >> 8) & 0xff;
2345         __u8 control = (value >> 8) & 0xff;
2346         __u8 channel = value & 0xff;
2347 
2348         if (channel >= MAX_CHANNELS) {
2349                 usb_audio_dbg(mixer->chip,
2350                         "%s(): bogus channel number %d\n",
2351                         __func__, channel);
2352                 return;
2353         }
2354 
2355         for (info = mixer->id_elems[unitid]; info; info = info->next_id_elem) {
2356                 if (info->control != control)
2357                         continue;
2358 
2359                 switch (attribute) {
2360                 case UAC2_CS_CUR:
2361                         /* invalidate cache, so the value is read from the device */
2362                         if (channel)
2363                                 info->cached &= ~(1 << channel);
2364                         else /* master channel */
2365                                 info->cached = 0;
2366 
2367                         snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
2368                                         info->elem_id);
2369                         break;
2370 
2371                 case UAC2_CS_RANGE:
2372                         /* TODO */
2373                         break;
2374 
2375                 case UAC2_CS_MEM:
2376                         /* TODO */
2377                         break;
2378 
2379                 default:
2380                         usb_audio_dbg(mixer->chip,
2381                                 "unknown attribute %d in interrupt\n",
2382                                 attribute);
2383                         break;
2384                 } /* switch */
2385         }
2386 }
2387 
2388 static void snd_usb_mixer_interrupt(struct urb *urb)
2389 {
2390         struct usb_mixer_interface *mixer = urb->context;
2391         int len = urb->actual_length;
2392         int ustatus = urb->status;
2393 
2394         if (ustatus != 0)
2395                 goto requeue;
2396 
2397         if (mixer->protocol == UAC_VERSION_1) {
2398                 struct uac1_status_word *status;
2399 
2400                 for (status = urb->transfer_buffer;
2401                      len >= sizeof(*status);
2402                      len -= sizeof(*status), status++) {
2403                         dev_dbg(&urb->dev->dev, "status interrupt: %02x %02x\n",
2404                                                 status->bStatusType,
2405                                                 status->bOriginator);
2406 
2407                         /* ignore any notifications not from the control interface */
2408                         if ((status->bStatusType & UAC1_STATUS_TYPE_ORIG_MASK) !=
2409                                 UAC1_STATUS_TYPE_ORIG_AUDIO_CONTROL_IF)
2410                                 continue;
2411 
2412                         if (status->bStatusType & UAC1_STATUS_TYPE_MEM_CHANGED)
2413                                 snd_usb_mixer_rc_memory_change(mixer, status->bOriginator);
2414                         else
2415                                 snd_usb_mixer_notify_id(mixer, status->bOriginator);
2416                 }
2417         } else { /* UAC_VERSION_2 */
2418                 struct uac2_interrupt_data_msg *msg;
2419 
2420                 for (msg = urb->transfer_buffer;
2421                      len >= sizeof(*msg);
2422                      len -= sizeof(*msg), msg++) {
2423                         /* drop vendor specific and endpoint requests */
2424                         if ((msg->bInfo & UAC2_INTERRUPT_DATA_MSG_VENDOR) ||
2425                             (msg->bInfo & UAC2_INTERRUPT_DATA_MSG_EP))
2426                                 continue;
2427 
2428                         snd_usb_mixer_interrupt_v2(mixer, msg->bAttribute,
2429                                                    le16_to_cpu(msg->wValue),
2430                                                    le16_to_cpu(msg->wIndex));
2431                 }
2432         }
2433 
2434 requeue:
2435         if (ustatus != -ENOENT &&
2436             ustatus != -ECONNRESET &&
2437             ustatus != -ESHUTDOWN) {
2438                 urb->dev = mixer->chip->dev;
2439                 usb_submit_urb(urb, GFP_ATOMIC);
2440         }
2441 }
2442 
2443 /* create the handler for the optional status interrupt endpoint */
2444 static int snd_usb_mixer_status_create(struct usb_mixer_interface *mixer)
2445 {
2446         struct usb_endpoint_descriptor *ep;
2447         void *transfer_buffer;
2448         int buffer_length;
2449         unsigned int epnum;
2450 
2451         /* we need one interrupt input endpoint */
2452         if (get_iface_desc(mixer->hostif)->bNumEndpoints < 1)
2453                 return 0;
2454         ep = get_endpoint(mixer->hostif, 0);
2455         if (!usb_endpoint_dir_in(ep) || !usb_endpoint_xfer_int(ep))
2456                 return 0;
2457 
2458         epnum = usb_endpoint_num(ep);
2459         buffer_length = le16_to_cpu(ep->wMaxPacketSize);
2460         transfer_buffer = kmalloc(buffer_length, GFP_KERNEL);
2461         if (!transfer_buffer)
2462                 return -ENOMEM;
2463         mixer->urb = usb_alloc_urb(0, GFP_KERNEL);
2464         if (!mixer->urb) {
2465                 kfree(transfer_buffer);
2466                 return -ENOMEM;
2467         }
2468         usb_fill_int_urb(mixer->urb, mixer->chip->dev,
2469                          usb_rcvintpipe(mixer->chip->dev, epnum),
2470                          transfer_buffer, buffer_length,
2471                          snd_usb_mixer_interrupt, mixer, ep->bInterval);
2472         usb_submit_urb(mixer->urb, GFP_KERNEL);
2473         return 0;
2474 }
2475 
2476 int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif,
2477                          int ignore_error)
2478 {
2479         static struct snd_device_ops dev_ops = {
2480                 .dev_free = snd_usb_mixer_dev_free
2481         };
2482         struct usb_mixer_interface *mixer;
2483         struct snd_info_entry *entry;
2484         int err;
2485 
2486         strcpy(chip->card->mixername, "USB Mixer");
2487 
2488         mixer = kzalloc(sizeof(*mixer), GFP_KERNEL);
2489         if (!mixer)
2490                 return -ENOMEM;
2491         mixer->chip = chip;
2492         mixer->ignore_ctl_error = ignore_error;
2493         mixer->id_elems = kcalloc(MAX_ID_ELEMS, sizeof(*mixer->id_elems),
2494                                   GFP_KERNEL);
2495         if (!mixer->id_elems) {
2496                 kfree(mixer);
2497                 return -ENOMEM;
2498         }
2499 
2500         mixer->hostif = &usb_ifnum_to_if(chip->dev, ctrlif)->altsetting[0];
2501         switch (get_iface_desc(mixer->hostif)->bInterfaceProtocol) {
2502         case UAC_VERSION_1:
2503         default:
2504                 mixer->protocol = UAC_VERSION_1;
2505                 break;
2506         case UAC_VERSION_2:
2507                 mixer->protocol = UAC_VERSION_2;
2508                 break;
2509         }
2510 
2511         if ((err = snd_usb_mixer_controls(mixer)) < 0 ||
2512             (err = snd_usb_mixer_status_create(mixer)) < 0)
2513                 goto _error;
2514 
2515         snd_usb_mixer_apply_create_quirk(mixer);
2516 
2517         err = snd_device_new(chip->card, SNDRV_DEV_CODEC, mixer, &dev_ops);
2518         if (err < 0)
2519                 goto _error;
2520 
2521         if (list_empty(&chip->mixer_list) &&
2522             !snd_card_proc_new(chip->card, "usbmixer", &entry))
2523                 snd_info_set_text_ops(entry, chip, snd_usb_mixer_proc_read);
2524 
2525         list_add(&mixer->list, &chip->mixer_list);
2526         return 0;
2527 
2528 _error:
2529         snd_usb_mixer_free(mixer);
2530         return err;
2531 }
2532 
2533 void snd_usb_mixer_disconnect(struct list_head *p)
2534 {
2535         struct usb_mixer_interface *mixer;
2536 
2537         mixer = list_entry(p, struct usb_mixer_interface, list);
2538         if (mixer->disconnected)
2539                 return;
2540         if (mixer->urb)
2541                 usb_kill_urb(mixer->urb);
2542         if (mixer->rc_urb)
2543                 usb_kill_urb(mixer->rc_urb);
2544         mixer->disconnected = true;
2545 }
2546 
2547 #ifdef CONFIG_PM
2548 /* stop any bus activity of a mixer */
2549 static void snd_usb_mixer_inactivate(struct usb_mixer_interface *mixer)
2550 {
2551         usb_kill_urb(mixer->urb);
2552         usb_kill_urb(mixer->rc_urb);
2553 }
2554 
2555 static int snd_usb_mixer_activate(struct usb_mixer_interface *mixer)
2556 {
2557         int err;
2558 
2559         if (mixer->urb) {
2560                 err = usb_submit_urb(mixer->urb, GFP_NOIO);
2561                 if (err < 0)
2562                         return err;
2563         }
2564 
2565         return 0;
2566 }
2567 
2568 int snd_usb_mixer_suspend(struct usb_mixer_interface *mixer)
2569 {
2570         snd_usb_mixer_inactivate(mixer);
2571         return 0;
2572 }
2573 
2574 static int restore_mixer_value(struct usb_mixer_elem_info *cval)
2575 {
2576         int c, err, idx;
2577 
2578         if (cval->cmask) {
2579                 idx = 0;
2580                 for (c = 0; c < MAX_CHANNELS; c++) {
2581                         if (!(cval->cmask & (1 << c)))
2582                                 continue;
2583                         if (cval->cached & (1 << c)) {
2584                                 err = set_cur_mix_value(cval, c + 1, idx,
2585                                                         cval->cache_val[idx]);
2586                                 if (err < 0)
2587                                         return err;
2588                         }
2589                         idx++;
2590                 }
2591         } else {
2592                 /* master */
2593                 if (cval->cached) {
2594                         err = set_cur_mix_value(cval, 0, 0, *cval->cache_val);
2595                         if (err < 0)
2596                                 return err;
2597                 }
2598         }
2599 
2600         return 0;
2601 }
2602 
2603 int snd_usb_mixer_resume(struct usb_mixer_interface *mixer, bool reset_resume)
2604 {
2605         struct usb_mixer_elem_info *cval;
2606         int id, err;
2607 
2608         /* FIXME: any mixer quirks? */
2609 
2610         if (reset_resume) {
2611                 /* restore cached mixer values */
2612                 for (id = 0; id < MAX_ID_ELEMS; id++) {
2613                         for (cval = mixer->id_elems[id]; cval;
2614                              cval = cval->next_id_elem) {
2615                                 err = restore_mixer_value(cval);
2616                                 if (err < 0)
2617                                         return err;
2618                         }
2619                 }
2620         }
2621 
2622         return snd_usb_mixer_activate(mixer);
2623 }
2624 #endif
2625 

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