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

Version: ~ [ linux-5.6 ] ~ [ linux-5.5.13 ] ~ [ linux-5.4.28 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.113 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.174 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.217 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.217 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.82 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  *   (Tentative) USB Audio Driver for ALSA
  3  *
  4  *   Mixer control part
  5  *
  6  *   Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
  7  *
  8  *   Many codes borrowed from audio.c by
  9  *          Alan Cox (alan@lxorguk.ukuu.org.uk)
 10  *          Thomas Sailer (sailer@ife.ee.ethz.ch)
 11  *
 12  *
 13  *   This program is free software; you can redistribute it and/or modify
 14  *   it under the terms of the GNU General Public License as published by
 15  *   the Free Software Foundation; either version 2 of the License, or
 16  *   (at your option) any later version.
 17  *
 18  *   This program is distributed in the hope that it will be useful,
 19  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 20  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 21  *   GNU General Public License for more details.
 22  *
 23  *   You should have received a copy of the GNU General Public License
 24  *   along with this program; if not, write to the Free Software
 25  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 26  *
 27  */
 28 
 29 /*
 30  * TODOs, for both the mixer and the streaming interfaces:
 31  *
 32  *  - support for UAC2 effect units
 33  *  - support for graphical equalizers
 34  *  - RANGE and MEM set commands (UAC2)
 35  *  - RANGE and MEM interrupt dispatchers (UAC2)
 36  *  - audio channel clustering (UAC2)
 37  *  - audio sample rate converter units (UAC2)
 38  *  - proper handling of clock multipliers (UAC2)
 39  *  - dispatch clock change notifications (UAC2)
 40  *      - stop PCM streams which use a clock that became invalid
 41  *      - stop PCM streams which use a clock selector that has changed
 42  *      - parse available sample rates again when clock sources changed
 43  */
 44 
 45 #include <linux/bitops.h>
 46 #include <linux/init.h>
 47 #include <linux/list.h>
 48 #include <linux/slab.h>
 49 #include <linux/string.h>
 50 #include <linux/usb.h>
 51 #include <linux/usb/audio.h>
 52 #include <linux/usb/audio-v2.h>
 53 
 54 #include <sound/core.h>
 55 #include <sound/control.h>
 56 #include <sound/hwdep.h>
 57 #include <sound/info.h>
 58 #include <sound/tlv.h>
 59 
 60 #include "usbaudio.h"
 61 #include "mixer.h"
 62 #include "helper.h"
 63 #include "mixer_quirks.h"
 64 #include "power.h"
 65 
 66 #define MAX_ID_ELEMS    256
 67 
 68 struct usb_audio_term {
 69         int id;
 70         int type;
 71         int channels;
 72         unsigned int chconfig;
 73         int name;
 74 };
 75 
 76 struct usbmix_name_map;
 77 
 78 struct mixer_build {
 79         struct snd_usb_audio *chip;
 80         struct usb_mixer_interface *mixer;
 81         unsigned char *buffer;
 82         unsigned int buflen;
 83         DECLARE_BITMAP(unitbitmap, MAX_ID_ELEMS);
 84         struct usb_audio_term oterm;
 85         const struct usbmix_name_map *map;
 86         const struct usbmix_selector_map *selector_map;
 87 };
 88 
 89 /*E-mu 0202/0404/0204 eXtension Unit(XU) control*/
 90 enum {
 91         USB_XU_CLOCK_RATE               = 0xe301,
 92         USB_XU_CLOCK_SOURCE             = 0xe302,
 93         USB_XU_DIGITAL_IO_STATUS        = 0xe303,
 94         USB_XU_DEVICE_OPTIONS           = 0xe304,
 95         USB_XU_DIRECT_MONITORING        = 0xe305,
 96         USB_XU_METERING                 = 0xe306
 97 };
 98 enum {
 99         USB_XU_CLOCK_SOURCE_SELECTOR = 0x02,    /* clock source*/
100         USB_XU_CLOCK_RATE_SELECTOR = 0x03,      /* clock rate */
101         USB_XU_DIGITAL_FORMAT_SELECTOR = 0x01,  /* the spdif format */
102         USB_XU_SOFT_LIMIT_SELECTOR = 0x03       /* soft limiter */
103 };
104 
105 /*
106  * manual mapping of mixer names
107  * if the mixer topology is too complicated and the parsed names are
108  * ambiguous, add the entries in usbmixer_maps.c.
109  */
110 #include "mixer_maps.c"
111 
112 static const struct usbmix_name_map *
113 find_map(struct mixer_build *state, int unitid, int control)
114 {
115         const struct usbmix_name_map *p = state->map;
116 
117         if (!p)
118                 return NULL;
119 
120         for (p = state->map; p->id; p++) {
121                 if (p->id == unitid &&
122                     (!control || !p->control || control == p->control))
123                         return p;
124         }
125         return NULL;
126 }
127 
128 /* get the mapped name if the unit matches */
129 static int
130 check_mapped_name(const struct usbmix_name_map *p, char *buf, int buflen)
131 {
132         if (!p || !p->name)
133                 return 0;
134 
135         buflen--;
136         return strlcpy(buf, p->name, buflen);
137 }
138 
139 /* check whether the control should be ignored */
140 static inline int
141 check_ignored_ctl(const struct usbmix_name_map *p)
142 {
143         if (!p || p->name || p->dB)
144                 return 0;
145         return 1;
146 }
147 
148 /* dB mapping */
149 static inline void check_mapped_dB(const struct usbmix_name_map *p,
150                                    struct usb_mixer_elem_info *cval)
151 {
152         if (p && p->dB) {
153                 cval->dBmin = p->dB->min;
154                 cval->dBmax = p->dB->max;
155                 cval->initialized = 1;
156         }
157 }
158 
159 /* get the mapped selector source name */
160 static int check_mapped_selector_name(struct mixer_build *state, int unitid,
161                                       int index, char *buf, int buflen)
162 {
163         const struct usbmix_selector_map *p;
164 
165         if (! state->selector_map)
166                 return 0;
167         for (p = state->selector_map; p->id; p++) {
168                 if (p->id == unitid && index < p->count)
169                         return strlcpy(buf, p->names[index], buflen);
170         }
171         return 0;
172 }
173 
174 /*
175  * find an audio control unit with the given unit id
176  */
177 static void *find_audio_control_unit(struct mixer_build *state, unsigned char unit)
178 {
179         /* we just parse the header */
180         struct uac_feature_unit_descriptor *hdr = NULL;
181 
182         while ((hdr = snd_usb_find_desc(state->buffer, state->buflen, hdr,
183                                         USB_DT_CS_INTERFACE)) != NULL) {
184                 if (hdr->bLength >= 4 &&
185                     hdr->bDescriptorSubtype >= UAC_INPUT_TERMINAL &&
186                     hdr->bDescriptorSubtype <= UAC2_SAMPLE_RATE_CONVERTER &&
187                     hdr->bUnitID == unit)
188                         return hdr;
189         }
190 
191         return NULL;
192 }
193 
194 /*
195  * copy a string with the given id
196  */
197 static int snd_usb_copy_string_desc(struct mixer_build *state, int index, char *buf, int maxlen)
198 {
199         int len = usb_string(state->chip->dev, index, buf, maxlen - 1);
200         buf[len] = 0;
201         return len;
202 }
203 
204 /*
205  * convert from the byte/word on usb descriptor to the zero-based integer
206  */
207 static int convert_signed_value(struct usb_mixer_elem_info *cval, int val)
208 {
209         switch (cval->val_type) {
210         case USB_MIXER_BOOLEAN:
211                 return !!val;
212         case USB_MIXER_INV_BOOLEAN:
213                 return !val;
214         case USB_MIXER_U8:
215                 val &= 0xff;
216                 break;
217         case USB_MIXER_S8:
218                 val &= 0xff;
219                 if (val >= 0x80)
220                         val -= 0x100;
221                 break;
222         case USB_MIXER_U16:
223                 val &= 0xffff;
224                 break;
225         case USB_MIXER_S16:
226                 val &= 0xffff;
227                 if (val >= 0x8000)
228                         val -= 0x10000;
229                 break;
230         }
231         return val;
232 }
233 
234 /*
235  * convert from the zero-based int to the byte/word for usb descriptor
236  */
237 static int convert_bytes_value(struct usb_mixer_elem_info *cval, int val)
238 {
239         switch (cval->val_type) {
240         case USB_MIXER_BOOLEAN:
241                 return !!val;
242         case USB_MIXER_INV_BOOLEAN:
243                 return !val;
244         case USB_MIXER_S8:
245         case USB_MIXER_U8:
246                 return val & 0xff;
247         case USB_MIXER_S16:
248         case USB_MIXER_U16:
249                 return val & 0xffff;
250         }
251         return 0; /* not reached */
252 }
253 
254 static int get_relative_value(struct usb_mixer_elem_info *cval, int val)
255 {
256         if (! cval->res)
257                 cval->res = 1;
258         if (val < cval->min)
259                 return 0;
260         else if (val >= cval->max)
261                 return (cval->max - cval->min + cval->res - 1) / cval->res;
262         else
263                 return (val - cval->min) / cval->res;
264 }
265 
266 static int get_abs_value(struct usb_mixer_elem_info *cval, int val)
267 {
268         if (val < 0)
269                 return cval->min;
270         if (! cval->res)
271                 cval->res = 1;
272         val *= cval->res;
273         val += cval->min;
274         if (val > cval->max)
275                 return cval->max;
276         return val;
277 }
278 
279 
280 /*
281  * retrieve a mixer value
282  */
283 
284 static int get_ctl_value_v1(struct usb_mixer_elem_info *cval, int request, int validx, int *value_ret)
285 {
286         struct snd_usb_audio *chip = cval->mixer->chip;
287         unsigned char buf[2];
288         int val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
289         int timeout = 10;
290         int idx = 0, err;
291 
292         err = snd_usb_autoresume(cval->mixer->chip);
293         if (err < 0)
294                 return -EIO;
295         down_read(&chip->shutdown_rwsem);
296         while (timeout-- > 0) {
297                 if (chip->shutdown)
298                         break;
299                 idx = snd_usb_ctrl_intf(chip) | (cval->id << 8);
300                 if (snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), request,
301                                     USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
302                                     validx, idx, buf, val_len) >= val_len) {
303                         *value_ret = convert_signed_value(cval, snd_usb_combine_bytes(buf, val_len));
304                         err = 0;
305                         goto out;
306                 }
307         }
308         snd_printdd(KERN_ERR "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
309                     request, validx, idx, cval->val_type);
310         err = -EINVAL;
311 
312  out:
313         up_read(&chip->shutdown_rwsem);
314         snd_usb_autosuspend(cval->mixer->chip);
315         return err;
316 }
317 
318 static int get_ctl_value_v2(struct usb_mixer_elem_info *cval, int request, int validx, int *value_ret)
319 {
320         struct snd_usb_audio *chip = cval->mixer->chip;
321         unsigned char buf[2 + 3*sizeof(__u16)]; /* enough space for one range */
322         unsigned char *val;
323         int idx = 0, ret, size;
324         __u8 bRequest;
325 
326         if (request == UAC_GET_CUR) {
327                 bRequest = UAC2_CS_CUR;
328                 size = sizeof(__u16);
329         } else {
330                 bRequest = UAC2_CS_RANGE;
331                 size = sizeof(buf);
332         }
333 
334         memset(buf, 0, sizeof(buf));
335 
336         ret = snd_usb_autoresume(chip) ? -EIO : 0;
337         if (ret)
338                 goto error;
339 
340         down_read(&chip->shutdown_rwsem);
341         if (chip->shutdown)
342                 ret = -ENODEV;
343         else {
344                 idx = snd_usb_ctrl_intf(chip) | (cval->id << 8);
345                 ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), bRequest,
346                               USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
347                               validx, idx, buf, size);
348         }
349         up_read(&chip->shutdown_rwsem);
350         snd_usb_autosuspend(chip);
351 
352         if (ret < 0) {
353 error:
354                 snd_printk(KERN_ERR "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
355                            request, validx, idx, cval->val_type);
356                 return ret;
357         }
358 
359         /* FIXME: how should we handle multiple triplets here? */
360 
361         switch (request) {
362         case UAC_GET_CUR:
363                 val = buf;
364                 break;
365         case UAC_GET_MIN:
366                 val = buf + sizeof(__u16);
367                 break;
368         case UAC_GET_MAX:
369                 val = buf + sizeof(__u16) * 2;
370                 break;
371         case UAC_GET_RES:
372                 val = buf + sizeof(__u16) * 3;
373                 break;
374         default:
375                 return -EINVAL;
376         }
377 
378         *value_ret = convert_signed_value(cval, snd_usb_combine_bytes(val, sizeof(__u16)));
379 
380         return 0;
381 }
382 
383 static int get_ctl_value(struct usb_mixer_elem_info *cval, int request, int validx, int *value_ret)
384 {
385         validx += cval->idx_off;
386 
387         return (cval->mixer->protocol == UAC_VERSION_1) ?
388                 get_ctl_value_v1(cval, request, validx, value_ret) :
389                 get_ctl_value_v2(cval, request, validx, value_ret);
390 }
391 
392 static int get_cur_ctl_value(struct usb_mixer_elem_info *cval, int validx, int *value)
393 {
394         return get_ctl_value(cval, UAC_GET_CUR, validx, value);
395 }
396 
397 /* channel = 0: master, 1 = first channel */
398 static inline int get_cur_mix_raw(struct usb_mixer_elem_info *cval,
399                                   int channel, int *value)
400 {
401         return get_ctl_value(cval, UAC_GET_CUR, (cval->control << 8) | channel, value);
402 }
403 
404 static int get_cur_mix_value(struct usb_mixer_elem_info *cval,
405                              int channel, int index, int *value)
406 {
407         int err;
408 
409         if (cval->cached & (1 << channel)) {
410                 *value = cval->cache_val[index];
411                 return 0;
412         }
413         err = get_cur_mix_raw(cval, channel, value);
414         if (err < 0) {
415                 if (!cval->mixer->ignore_ctl_error)
416                         snd_printd(KERN_ERR "cannot get current value for control %d ch %d: err = %d\n",
417                                    cval->control, channel, err);
418                 return err;
419         }
420         cval->cached |= 1 << channel;
421         cval->cache_val[index] = *value;
422         return 0;
423 }
424 
425 
426 /*
427  * set a mixer value
428  */
429 
430 int snd_usb_mixer_set_ctl_value(struct usb_mixer_elem_info *cval,
431                                 int request, int validx, int value_set)
432 {
433         struct snd_usb_audio *chip = cval->mixer->chip;
434         unsigned char buf[2];
435         int idx = 0, val_len, err, timeout = 10;
436 
437         validx += cval->idx_off;
438 
439         if (cval->mixer->protocol == UAC_VERSION_1) {
440                 val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
441         } else { /* UAC_VERSION_2 */
442                 /* audio class v2 controls are always 2 bytes in size */
443                 val_len = sizeof(__u16);
444 
445                 /* FIXME */
446                 if (request != UAC_SET_CUR) {
447                         snd_printdd(KERN_WARNING "RANGE setting not yet supported\n");
448                         return -EINVAL;
449                 }
450 
451                 request = UAC2_CS_CUR;
452         }
453 
454         value_set = convert_bytes_value(cval, value_set);
455         buf[0] = value_set & 0xff;
456         buf[1] = (value_set >> 8) & 0xff;
457         err = snd_usb_autoresume(chip);
458         if (err < 0)
459                 return -EIO;
460         down_read(&chip->shutdown_rwsem);
461         while (timeout-- > 0) {
462                 if (chip->shutdown)
463                         break;
464                 idx = snd_usb_ctrl_intf(chip) | (cval->id << 8);
465                 if (snd_usb_ctl_msg(chip->dev,
466                                     usb_sndctrlpipe(chip->dev, 0), request,
467                                     USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
468                                     validx, idx, buf, val_len) >= 0) {
469                         err = 0;
470                         goto out;
471                 }
472         }
473         snd_printdd(KERN_ERR "cannot set ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d, data = %#x/%#x\n",
474                     request, validx, idx, cval->val_type, buf[0], buf[1]);
475         err = -EINVAL;
476 
477  out:
478         up_read(&chip->shutdown_rwsem);
479         snd_usb_autosuspend(chip);
480         return err;
481 }
482 
483 static int set_cur_ctl_value(struct usb_mixer_elem_info *cval, int validx, int value)
484 {
485         return snd_usb_mixer_set_ctl_value(cval, UAC_SET_CUR, validx, value);
486 }
487 
488 static int set_cur_mix_value(struct usb_mixer_elem_info *cval, int channel,
489                              int index, int value)
490 {
491         int err;
492         unsigned int read_only = (channel == 0) ?
493                 cval->master_readonly :
494                 cval->ch_readonly & (1 << (channel - 1));
495 
496         if (read_only) {
497                 snd_printdd(KERN_INFO "%s(): channel %d of control %d is read_only\n",
498                             __func__, channel, cval->control);
499                 return 0;
500         }
501 
502         err = snd_usb_mixer_set_ctl_value(cval, UAC_SET_CUR, (cval->control << 8) | channel,
503                             value);
504         if (err < 0)
505                 return err;
506         cval->cached |= 1 << channel;
507         cval->cache_val[index] = value;
508         return 0;
509 }
510 
511 /*
512  * TLV callback for mixer volume controls
513  */
514 int snd_usb_mixer_vol_tlv(struct snd_kcontrol *kcontrol, int op_flag,
515                          unsigned int size, unsigned int __user *_tlv)
516 {
517         struct usb_mixer_elem_info *cval = kcontrol->private_data;
518         DECLARE_TLV_DB_MINMAX(scale, 0, 0);
519 
520         if (size < sizeof(scale))
521                 return -ENOMEM;
522         scale[2] = cval->dBmin;
523         scale[3] = cval->dBmax;
524         if (copy_to_user(_tlv, scale, sizeof(scale)))
525                 return -EFAULT;
526         return 0;
527 }
528 
529 /*
530  * parser routines begin here...
531  */
532 
533 static int parse_audio_unit(struct mixer_build *state, int unitid);
534 
535 
536 /*
537  * check if the input/output channel routing is enabled on the given bitmap.
538  * used for mixer unit parser
539  */
540 static int check_matrix_bitmap(unsigned char *bmap, int ich, int och, int num_outs)
541 {
542         int idx = ich * num_outs + och;
543         return bmap[idx >> 3] & (0x80 >> (idx & 7));
544 }
545 
546 
547 /*
548  * add an alsa control element
549  * search and increment the index until an empty slot is found.
550  *
551  * if failed, give up and free the control instance.
552  */
553 
554 int snd_usb_mixer_add_control(struct usb_mixer_interface *mixer,
555                               struct snd_kcontrol *kctl)
556 {
557         struct usb_mixer_elem_info *cval = kctl->private_data;
558         int err;
559 
560         while (snd_ctl_find_id(mixer->chip->card, &kctl->id))
561                 kctl->id.index++;
562         if ((err = snd_ctl_add(mixer->chip->card, kctl)) < 0) {
563                 snd_printd(KERN_ERR "cannot add control (err = %d)\n", err);
564                 return err;
565         }
566         cval->elem_id = &kctl->id;
567         cval->next_id_elem = mixer->id_elems[cval->id];
568         mixer->id_elems[cval->id] = cval;
569         return 0;
570 }
571 
572 
573 /*
574  * get a terminal name string
575  */
576 
577 static struct iterm_name_combo {
578         int type;
579         char *name;
580 } iterm_names[] = {
581         { 0x0300, "Output" },
582         { 0x0301, "Speaker" },
583         { 0x0302, "Headphone" },
584         { 0x0303, "HMD Audio" },
585         { 0x0304, "Desktop Speaker" },
586         { 0x0305, "Room Speaker" },
587         { 0x0306, "Com Speaker" },
588         { 0x0307, "LFE" },
589         { 0x0600, "External In" },
590         { 0x0601, "Analog In" },
591         { 0x0602, "Digital In" },
592         { 0x0603, "Line" },
593         { 0x0604, "Legacy In" },
594         { 0x0605, "IEC958 In" },
595         { 0x0606, "1394 DA Stream" },
596         { 0x0607, "1394 DV Stream" },
597         { 0x0700, "Embedded" },
598         { 0x0701, "Noise Source" },
599         { 0x0702, "Equalization Noise" },
600         { 0x0703, "CD" },
601         { 0x0704, "DAT" },
602         { 0x0705, "DCC" },
603         { 0x0706, "MiniDisk" },
604         { 0x0707, "Analog Tape" },
605         { 0x0708, "Phonograph" },
606         { 0x0709, "VCR Audio" },
607         { 0x070a, "Video Disk Audio" },
608         { 0x070b, "DVD Audio" },
609         { 0x070c, "TV Tuner Audio" },
610         { 0x070d, "Satellite Rec Audio" },
611         { 0x070e, "Cable Tuner Audio" },
612         { 0x070f, "DSS Audio" },
613         { 0x0710, "Radio Receiver" },
614         { 0x0711, "Radio Transmitter" },
615         { 0x0712, "Multi-Track Recorder" },
616         { 0x0713, "Synthesizer" },
617         { 0 },
618 };
619 
620 static int get_term_name(struct mixer_build *state, struct usb_audio_term *iterm,
621                          unsigned char *name, int maxlen, int term_only)
622 {
623         struct iterm_name_combo *names;
624 
625         if (iterm->name)
626                 return snd_usb_copy_string_desc(state, iterm->name, name, maxlen);
627 
628         /* virtual type - not a real terminal */
629         if (iterm->type >> 16) {
630                 if (term_only)
631                         return 0;
632                 switch (iterm->type >> 16) {
633                 case UAC_SELECTOR_UNIT:
634                         strcpy(name, "Selector"); return 8;
635                 case UAC1_PROCESSING_UNIT:
636                         strcpy(name, "Process Unit"); return 12;
637                 case UAC1_EXTENSION_UNIT:
638                         strcpy(name, "Ext Unit"); return 8;
639                 case UAC_MIXER_UNIT:
640                         strcpy(name, "Mixer"); return 5;
641                 default:
642                         return sprintf(name, "Unit %d", iterm->id);
643                 }
644         }
645 
646         switch (iterm->type & 0xff00) {
647         case 0x0100:
648                 strcpy(name, "PCM"); return 3;
649         case 0x0200:
650                 strcpy(name, "Mic"); return 3;
651         case 0x0400:
652                 strcpy(name, "Headset"); return 7;
653         case 0x0500:
654                 strcpy(name, "Phone"); return 5;
655         }
656 
657         for (names = iterm_names; names->type; names++)
658                 if (names->type == iterm->type) {
659                         strcpy(name, names->name);
660                         return strlen(names->name);
661                 }
662         return 0;
663 }
664 
665 
666 /*
667  * parse the source unit recursively until it reaches to a terminal
668  * or a branched unit.
669  */
670 static int check_input_term(struct mixer_build *state, int id, struct usb_audio_term *term)
671 {
672         int err;
673         void *p1;
674 
675         memset(term, 0, sizeof(*term));
676         while ((p1 = find_audio_control_unit(state, id)) != NULL) {
677                 unsigned char *hdr = p1;
678                 term->id = id;
679                 switch (hdr[2]) {
680                 case UAC_INPUT_TERMINAL:
681                         if (state->mixer->protocol == UAC_VERSION_1) {
682                                 struct uac_input_terminal_descriptor *d = p1;
683                                 term->type = le16_to_cpu(d->wTerminalType);
684                                 term->channels = d->bNrChannels;
685                                 term->chconfig = le16_to_cpu(d->wChannelConfig);
686                                 term->name = d->iTerminal;
687                         } else { /* UAC_VERSION_2 */
688                                 struct uac2_input_terminal_descriptor *d = p1;
689                                 term->type = le16_to_cpu(d->wTerminalType);
690                                 term->channels = d->bNrChannels;
691                                 term->chconfig = le32_to_cpu(d->bmChannelConfig);
692                                 term->name = d->iTerminal;
693 
694                                 /* call recursively to get the clock selectors */
695                                 err = check_input_term(state, d->bCSourceID, term);
696                                 if (err < 0)
697                                         return err;
698                         }
699                         return 0;
700                 case UAC_FEATURE_UNIT: {
701                         /* the header is the same for v1 and v2 */
702                         struct uac_feature_unit_descriptor *d = p1;
703                         id = d->bSourceID;
704                         break; /* continue to parse */
705                 }
706                 case UAC_MIXER_UNIT: {
707                         struct uac_mixer_unit_descriptor *d = p1;
708                         term->type = d->bDescriptorSubtype << 16; /* virtual type */
709                         term->channels = uac_mixer_unit_bNrChannels(d);
710                         term->chconfig = uac_mixer_unit_wChannelConfig(d, state->mixer->protocol);
711                         term->name = uac_mixer_unit_iMixer(d);
712                         return 0;
713                 }
714                 case UAC_SELECTOR_UNIT:
715                 case UAC2_CLOCK_SELECTOR: {
716                         struct uac_selector_unit_descriptor *d = p1;
717                         /* call recursively to retrieve the channel info */
718                         err = check_input_term(state, d->baSourceID[0], term);
719                         if (err < 0)
720                                 return err;
721                         term->type = d->bDescriptorSubtype << 16; /* virtual type */
722                         term->id = id;
723                         term->name = uac_selector_unit_iSelector(d);
724                         return 0;
725                 }
726                 case UAC1_PROCESSING_UNIT:
727                 case UAC1_EXTENSION_UNIT:
728                 /* UAC2_PROCESSING_UNIT_V2 */
729                 /* UAC2_EFFECT_UNIT */
730                 case UAC2_EXTENSION_UNIT_V2: {
731                         struct uac_processing_unit_descriptor *d = p1;
732 
733                         if (state->mixer->protocol == UAC_VERSION_2 &&
734                                 hdr[2] == UAC2_EFFECT_UNIT) {
735                                 /* UAC2/UAC1 unit IDs overlap here in an
736                                  * uncompatible way. Ignore this unit for now.
737                                  */
738                                 return 0;
739                         }
740 
741                         if (d->bNrInPins) {
742                                 id = d->baSourceID[0];
743                                 break; /* continue to parse */
744                         }
745                         term->type = d->bDescriptorSubtype << 16; /* virtual type */
746                         term->channels = uac_processing_unit_bNrChannels(d);
747                         term->chconfig = uac_processing_unit_wChannelConfig(d, state->mixer->protocol);
748                         term->name = uac_processing_unit_iProcessing(d, state->mixer->protocol);
749                         return 0;
750                 }
751                 case UAC2_CLOCK_SOURCE: {
752                         struct uac_clock_source_descriptor *d = p1;
753                         term->type = d->bDescriptorSubtype << 16; /* virtual type */
754                         term->id = id;
755                         term->name = d->iClockSource;
756                         return 0;
757                 }
758                 default:
759                         return -ENODEV;
760                 }
761         }
762         return -ENODEV;
763 }
764 
765 
766 /*
767  * Feature Unit
768  */
769 
770 /* feature unit control information */
771 struct usb_feature_control_info {
772         const char *name;
773         unsigned int type;      /* control type (mute, volume, etc.) */
774 };
775 
776 static struct usb_feature_control_info audio_feature_info[] = {
777         { "Mute",                       USB_MIXER_INV_BOOLEAN },
778         { "Volume",                     USB_MIXER_S16 },
779         { "Tone Control - Bass",        USB_MIXER_S8 },
780         { "Tone Control - Mid",         USB_MIXER_S8 },
781         { "Tone Control - Treble",      USB_MIXER_S8 },
782         { "Graphic Equalizer",          USB_MIXER_S8 }, /* FIXME: not implemeted yet */
783         { "Auto Gain Control",          USB_MIXER_BOOLEAN },
784         { "Delay Control",              USB_MIXER_U16 },
785         { "Bass Boost",                 USB_MIXER_BOOLEAN },
786         { "Loudness",                   USB_MIXER_BOOLEAN },
787         /* UAC2 specific */
788         { "Input Gain Control",         USB_MIXER_U16 },
789         { "Input Gain Pad Control",     USB_MIXER_BOOLEAN },
790         { "Phase Inverter Control",     USB_MIXER_BOOLEAN },
791 };
792 
793 
794 /* private_free callback */
795 static void usb_mixer_elem_free(struct snd_kcontrol *kctl)
796 {
797         kfree(kctl->private_data);
798         kctl->private_data = NULL;
799 }
800 
801 
802 /*
803  * interface to ALSA control for feature/mixer units
804  */
805 
806 /* volume control quirks */
807 static void volume_control_quirks(struct usb_mixer_elem_info *cval,
808                                   struct snd_kcontrol *kctl)
809 {
810         switch (cval->mixer->chip->usb_id) {
811         case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
812         case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
813                 if (strcmp(kctl->id.name, "Effect Duration") == 0) {
814                         cval->min = 0x0000;
815                         cval->max = 0xffff;
816                         cval->res = 0x00e6;
817                         break;
818                 }
819                 if (strcmp(kctl->id.name, "Effect Volume") == 0 ||
820                     strcmp(kctl->id.name, "Effect Feedback Volume") == 0) {
821                         cval->min = 0x00;
822                         cval->max = 0xff;
823                         break;
824                 }
825                 if (strstr(kctl->id.name, "Effect Return") != NULL) {
826                         cval->min = 0xb706;
827                         cval->max = 0xff7b;
828                         cval->res = 0x0073;
829                         break;
830                 }
831                 if ((strstr(kctl->id.name, "Playback Volume") != NULL) ||
832                         (strstr(kctl->id.name, "Effect Send") != NULL)) {
833                         cval->min = 0xb5fb; /* -73 dB = 0xb6ff */
834                         cval->max = 0xfcfe;
835                         cval->res = 0x0073;
836                 }
837                 break;
838 
839         case USB_ID(0x0763, 0x2081): /* M-Audio Fast Track Ultra 8R */
840         case USB_ID(0x0763, 0x2080): /* M-Audio Fast Track Ultra */
841                 if (strcmp(kctl->id.name, "Effect Duration") == 0) {
842                         snd_printk(KERN_INFO
843                                 "usb-audio: set quirk for FTU Effect Duration\n");
844                         cval->min = 0x0000;
845                         cval->max = 0x7f00;
846                         cval->res = 0x0100;
847                         break;
848                 }
849                 if (strcmp(kctl->id.name, "Effect Volume") == 0 ||
850                     strcmp(kctl->id.name, "Effect Feedback Volume") == 0) {
851                         snd_printk(KERN_INFO
852                                 "usb-audio: set quirks for FTU Effect Feedback/Volume\n");
853                         cval->min = 0x00;
854                         cval->max = 0x7f;
855                         break;
856                 }
857                 break;
858 
859         case USB_ID(0x0471, 0x0101):
860         case USB_ID(0x0471, 0x0104):
861         case USB_ID(0x0471, 0x0105):
862         case USB_ID(0x0672, 0x1041):
863         /* quirk for UDA1321/N101.
864          * note that detection between firmware 2.1.1.7 (N101)
865          * and later 2.1.1.21 is not very clear from datasheets.
866          * I hope that the min value is -15360 for newer firmware --jk
867          */
868                 if (!strcmp(kctl->id.name, "PCM Playback Volume") &&
869                     cval->min == -15616) {
870                         snd_printk(KERN_INFO
871                                  "set volume quirk for UDA1321/N101 chip\n");
872                         cval->max = -256;
873                 }
874                 break;
875 
876         case USB_ID(0x046d, 0x09a4):
877                 if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
878                         snd_printk(KERN_INFO
879                                 "set volume quirk for QuickCam E3500\n");
880                         cval->min = 6080;
881                         cval->max = 8768;
882                         cval->res = 192;
883                 }
884                 break;
885 
886         case USB_ID(0x046d, 0x0807): /* Logitech Webcam C500 */
887         case USB_ID(0x046d, 0x0808):
888         case USB_ID(0x046d, 0x0809):
889         case USB_ID(0x046d, 0x0819): /* Logitech Webcam C210 */
890         case USB_ID(0x046d, 0x081b): /* HD Webcam c310 */
891         case USB_ID(0x046d, 0x081d): /* HD Webcam c510 */
892         case USB_ID(0x046d, 0x0825): /* HD Webcam c270 */
893         case USB_ID(0x046d, 0x0826): /* HD Webcam c525 */
894         case USB_ID(0x046d, 0x08ca): /* Logitech Quickcam Fusion */
895         case USB_ID(0x046d, 0x0991):
896         /* Most audio usb devices lie about volume resolution.
897          * Most Logitech webcams have res = 384.
898          * Proboly there is some logitech magic behind this number --fishor
899          */
900                 if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
901                         snd_printk(KERN_INFO
902                                 "set resolution quirk: cval->res = 384\n");
903                         cval->res = 384;
904                 }
905                 break;
906 
907         }
908 }
909 
910 /*
911  * retrieve the minimum and maximum values for the specified control
912  */
913 static int get_min_max_with_quirks(struct usb_mixer_elem_info *cval,
914                                    int default_min, struct snd_kcontrol *kctl)
915 {
916         /* for failsafe */
917         cval->min = default_min;
918         cval->max = cval->min + 1;
919         cval->res = 1;
920         cval->dBmin = cval->dBmax = 0;
921 
922         if (cval->val_type == USB_MIXER_BOOLEAN ||
923             cval->val_type == USB_MIXER_INV_BOOLEAN) {
924                 cval->initialized = 1;
925         } else {
926                 int minchn = 0;
927                 if (cval->cmask) {
928                         int i;
929                         for (i = 0; i < MAX_CHANNELS; i++)
930                                 if (cval->cmask & (1 << i)) {
931                                         minchn = i + 1;
932                                         break;
933                                 }
934                 }
935                 if (get_ctl_value(cval, UAC_GET_MAX, (cval->control << 8) | minchn, &cval->max) < 0 ||
936                     get_ctl_value(cval, UAC_GET_MIN, (cval->control << 8) | minchn, &cval->min) < 0) {
937                         snd_printd(KERN_ERR "%d:%d: cannot get min/max values for control %d (id %d)\n",
938                                    cval->id, snd_usb_ctrl_intf(cval->mixer->chip), cval->control, cval->id);
939                         return -EINVAL;
940                 }
941                 if (get_ctl_value(cval, UAC_GET_RES, (cval->control << 8) | minchn, &cval->res) < 0) {
942                         cval->res = 1;
943                 } else {
944                         int last_valid_res = cval->res;
945 
946                         while (cval->res > 1) {
947                                 if (snd_usb_mixer_set_ctl_value(cval, UAC_SET_RES,
948                                                                 (cval->control << 8) | minchn, cval->res / 2) < 0)
949                                         break;
950                                 cval->res /= 2;
951                         }
952                         if (get_ctl_value(cval, UAC_GET_RES, (cval->control << 8) | minchn, &cval->res) < 0)
953                                 cval->res = last_valid_res;
954                 }
955                 if (cval->res == 0)
956                         cval->res = 1;
957 
958                 /* Additional checks for the proper resolution
959                  *
960                  * Some devices report smaller resolutions than actually
961                  * reacting.  They don't return errors but simply clip
962                  * to the lower aligned value.
963                  */
964                 if (cval->min + cval->res < cval->max) {
965                         int last_valid_res = cval->res;
966                         int saved, test, check;
967                         get_cur_mix_raw(cval, minchn, &saved);
968                         for (;;) {
969                                 test = saved;
970                                 if (test < cval->max)
971                                         test += cval->res;
972                                 else
973                                         test -= cval->res;
974                                 if (test < cval->min || test > cval->max ||
975                                     set_cur_mix_value(cval, minchn, 0, test) ||
976                                     get_cur_mix_raw(cval, minchn, &check)) {
977                                         cval->res = last_valid_res;
978                                         break;
979                                 }
980                                 if (test == check)
981                                         break;
982                                 cval->res *= 2;
983                         }
984                         set_cur_mix_value(cval, minchn, 0, saved);
985                 }
986 
987                 cval->initialized = 1;
988         }
989 
990         if (kctl)
991                 volume_control_quirks(cval, kctl);
992 
993         /* USB descriptions contain the dB scale in 1/256 dB unit
994          * while ALSA TLV contains in 1/100 dB unit
995          */
996         cval->dBmin = (convert_signed_value(cval, cval->min) * 100) / 256;
997         cval->dBmax = (convert_signed_value(cval, cval->max) * 100) / 256;
998         if (cval->dBmin > cval->dBmax) {
999                 /* something is wrong; assume it's either from/to 0dB */
1000                 if (cval->dBmin < 0)
1001                         cval->dBmax = 0;
1002                 else if (cval->dBmin > 0)
1003                         cval->dBmin = 0;
1004                 if (cval->dBmin > cval->dBmax) {
1005                         /* totally crap, return an error */
1006                         return -EINVAL;
1007                 }
1008         }
1009 
1010         return 0;
1011 }
1012 
1013 #define get_min_max(cval, def)  get_min_max_with_quirks(cval, def, NULL)
1014 
1015 /* get a feature/mixer unit info */
1016 static int mixer_ctl_feature_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
1017 {
1018         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1019 
1020         if (cval->val_type == USB_MIXER_BOOLEAN ||
1021             cval->val_type == USB_MIXER_INV_BOOLEAN)
1022                 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1023         else
1024                 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
1025         uinfo->count = cval->channels;
1026         if (cval->val_type == USB_MIXER_BOOLEAN ||
1027             cval->val_type == USB_MIXER_INV_BOOLEAN) {
1028                 uinfo->value.integer.min = 0;
1029                 uinfo->value.integer.max = 1;
1030         } else {
1031                 if (!cval->initialized) {
1032                         get_min_max_with_quirks(cval, 0, kcontrol);
1033                         if (cval->initialized && cval->dBmin >= cval->dBmax) {
1034                                 kcontrol->vd[0].access &= 
1035                                         ~(SNDRV_CTL_ELEM_ACCESS_TLV_READ |
1036                                           SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK);
1037                                 snd_ctl_notify(cval->mixer->chip->card,
1038                                                SNDRV_CTL_EVENT_MASK_INFO,
1039                                                &kcontrol->id);
1040                         }
1041                 }
1042                 uinfo->value.integer.min = 0;
1043                 uinfo->value.integer.max =
1044                         (cval->max - cval->min + cval->res - 1) / cval->res;
1045         }
1046         return 0;
1047 }
1048 
1049 /* get the current value from feature/mixer unit */
1050 static int mixer_ctl_feature_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1051 {
1052         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1053         int c, cnt, val, err;
1054 
1055         ucontrol->value.integer.value[0] = cval->min;
1056         if (cval->cmask) {
1057                 cnt = 0;
1058                 for (c = 0; c < MAX_CHANNELS; c++) {
1059                         if (!(cval->cmask & (1 << c)))
1060                                 continue;
1061                         err = get_cur_mix_value(cval, c + 1, cnt, &val);
1062                         if (err < 0)
1063                                 return cval->mixer->ignore_ctl_error ? 0 : err;
1064                         val = get_relative_value(cval, val);
1065                         ucontrol->value.integer.value[cnt] = val;
1066                         cnt++;
1067                 }
1068                 return 0;
1069         } else {
1070                 /* master channel */
1071                 err = get_cur_mix_value(cval, 0, 0, &val);
1072                 if (err < 0)
1073                         return cval->mixer->ignore_ctl_error ? 0 : err;
1074                 val = get_relative_value(cval, val);
1075                 ucontrol->value.integer.value[0] = val;
1076         }
1077         return 0;
1078 }
1079 
1080 /* put the current value to feature/mixer unit */
1081 static int mixer_ctl_feature_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1082 {
1083         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1084         int c, cnt, val, oval, err;
1085         int changed = 0;
1086 
1087         if (cval->cmask) {
1088                 cnt = 0;
1089                 for (c = 0; c < MAX_CHANNELS; c++) {
1090                         if (!(cval->cmask & (1 << c)))
1091                                 continue;
1092                         err = get_cur_mix_value(cval, c + 1, cnt, &oval);
1093                         if (err < 0)
1094                                 return cval->mixer->ignore_ctl_error ? 0 : err;
1095                         val = ucontrol->value.integer.value[cnt];
1096                         val = get_abs_value(cval, val);
1097                         if (oval != val) {
1098                                 set_cur_mix_value(cval, c + 1, cnt, val);
1099                                 changed = 1;
1100                         }
1101                         cnt++;
1102                 }
1103         } else {
1104                 /* master channel */
1105                 err = get_cur_mix_value(cval, 0, 0, &oval);
1106                 if (err < 0)
1107                         return cval->mixer->ignore_ctl_error ? 0 : err;
1108                 val = ucontrol->value.integer.value[0];
1109                 val = get_abs_value(cval, val);
1110                 if (val != oval) {
1111                         set_cur_mix_value(cval, 0, 0, val);
1112                         changed = 1;
1113                 }
1114         }
1115         return changed;
1116 }
1117 
1118 static struct snd_kcontrol_new usb_feature_unit_ctl = {
1119         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1120         .name = "", /* will be filled later manually */
1121         .info = mixer_ctl_feature_info,
1122         .get = mixer_ctl_feature_get,
1123         .put = mixer_ctl_feature_put,
1124 };
1125 
1126 /* the read-only variant */
1127 static struct snd_kcontrol_new usb_feature_unit_ctl_ro = {
1128         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1129         .name = "", /* will be filled later manually */
1130         .info = mixer_ctl_feature_info,
1131         .get = mixer_ctl_feature_get,
1132         .put = NULL,
1133 };
1134 
1135 /* This symbol is exported in order to allow the mixer quirks to
1136  * hook up to the standard feature unit control mechanism */
1137 struct snd_kcontrol_new *snd_usb_feature_unit_ctl = &usb_feature_unit_ctl;
1138 
1139 /*
1140  * build a feature control
1141  */
1142 
1143 static size_t append_ctl_name(struct snd_kcontrol *kctl, const char *str)
1144 {
1145         return strlcat(kctl->id.name, str, sizeof(kctl->id.name));
1146 }
1147 
1148 /* A lot of headsets/headphones have a "Speaker" mixer. Make sure we
1149    rename it to "Headphone". We determine if something is a headphone
1150    similar to how udev determines form factor. */
1151 static void check_no_speaker_on_headset(struct snd_kcontrol *kctl,
1152                                         struct snd_card *card)
1153 {
1154         const char *names_to_check[] = {
1155                 "Headset", "headset", "Headphone", "headphone", NULL};
1156         const char **s;
1157         bool found = false;
1158 
1159         if (strcmp("Speaker", kctl->id.name))
1160                 return;
1161 
1162         for (s = names_to_check; *s; s++)
1163                 if (strstr(card->shortname, *s)) {
1164                         found = true;
1165                         break;
1166                 }
1167 
1168         if (!found)
1169                 return;
1170 
1171         strlcpy(kctl->id.name, "Headphone", sizeof(kctl->id.name));
1172 }
1173 
1174 static void build_feature_ctl(struct mixer_build *state, void *raw_desc,
1175                               unsigned int ctl_mask, int control,
1176                               struct usb_audio_term *iterm, int unitid,
1177                               int readonly_mask)
1178 {
1179         struct uac_feature_unit_descriptor *desc = raw_desc;
1180         unsigned int len = 0;
1181         int mapped_name = 0;
1182         int nameid = uac_feature_unit_iFeature(desc);
1183         struct snd_kcontrol *kctl;
1184         struct usb_mixer_elem_info *cval;
1185         const struct usbmix_name_map *map;
1186         unsigned int range;
1187 
1188         control++; /* change from zero-based to 1-based value */
1189 
1190         if (control == UAC_FU_GRAPHIC_EQUALIZER) {
1191                 /* FIXME: not supported yet */
1192                 return;
1193         }
1194 
1195         map = find_map(state, unitid, control);
1196         if (check_ignored_ctl(map))
1197                 return;
1198 
1199         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1200         if (! cval) {
1201                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1202                 return;
1203         }
1204         cval->mixer = state->mixer;
1205         cval->id = unitid;
1206         cval->control = control;
1207         cval->cmask = ctl_mask;
1208         cval->val_type = audio_feature_info[control-1].type;
1209         if (ctl_mask == 0) {
1210                 cval->channels = 1;     /* master channel */
1211                 cval->master_readonly = readonly_mask;
1212         } else {
1213                 int i, c = 0;
1214                 for (i = 0; i < 16; i++)
1215                         if (ctl_mask & (1 << i))
1216                                 c++;
1217                 cval->channels = c;
1218                 cval->ch_readonly = readonly_mask;
1219         }
1220 
1221         /* if all channels in the mask are marked read-only, make the control
1222          * read-only. set_cur_mix_value() will check the mask again and won't
1223          * issue write commands to read-only channels. */
1224         if (cval->channels == readonly_mask)
1225                 kctl = snd_ctl_new1(&usb_feature_unit_ctl_ro, cval);
1226         else
1227                 kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
1228 
1229         if (! kctl) {
1230                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1231                 kfree(cval);
1232                 return;
1233         }
1234         kctl->private_free = usb_mixer_elem_free;
1235 
1236         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
1237         mapped_name = len != 0;
1238         if (! len && nameid)
1239                 len = snd_usb_copy_string_desc(state, nameid,
1240                                 kctl->id.name, sizeof(kctl->id.name));
1241 
1242         switch (control) {
1243         case UAC_FU_MUTE:
1244         case UAC_FU_VOLUME:
1245                 /* determine the control name.  the rule is:
1246                  * - if a name id is given in descriptor, use it.
1247                  * - if the connected input can be determined, then use the name
1248                  *   of terminal type.
1249                  * - if the connected output can be determined, use it.
1250                  * - otherwise, anonymous name.
1251                  */
1252                 if (! len) {
1253                         len = get_term_name(state, iterm, kctl->id.name, sizeof(kctl->id.name), 1);
1254                         if (! len)
1255                                 len = get_term_name(state, &state->oterm, kctl->id.name, sizeof(kctl->id.name), 1);
1256                         if (! len)
1257                                 len = snprintf(kctl->id.name, sizeof(kctl->id.name),
1258                                                "Feature %d", unitid);
1259                 }
1260 
1261                 if (!mapped_name)
1262                         check_no_speaker_on_headset(kctl, state->mixer->chip->card);
1263 
1264                 /* determine the stream direction:
1265                  * if the connected output is USB stream, then it's likely a
1266                  * capture stream.  otherwise it should be playback (hopefully :)
1267                  */
1268                 if (! mapped_name && ! (state->oterm.type >> 16)) {
1269                         if ((state->oterm.type & 0xff00) == 0x0100) {
1270                                 len = append_ctl_name(kctl, " Capture");
1271                         } else {
1272                                 len = append_ctl_name(kctl, " Playback");
1273                         }
1274                 }
1275                 append_ctl_name(kctl, control == UAC_FU_MUTE ?
1276                                 " Switch" : " Volume");
1277                 break;
1278         default:
1279                 if (! len)
1280                         strlcpy(kctl->id.name, audio_feature_info[control-1].name,
1281                                 sizeof(kctl->id.name));
1282                 break;
1283         }
1284 
1285         /* get min/max values */
1286         get_min_max_with_quirks(cval, 0, kctl);
1287 
1288         if (control == UAC_FU_VOLUME) {
1289                 check_mapped_dB(map, cval);
1290                 if (cval->dBmin < cval->dBmax || !cval->initialized) {
1291                         kctl->tlv.c = snd_usb_mixer_vol_tlv;
1292                         kctl->vd[0].access |=
1293                                 SNDRV_CTL_ELEM_ACCESS_TLV_READ |
1294                                 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
1295                 }
1296         }
1297 
1298         range = (cval->max - cval->min) / cval->res;
1299         /* Are there devices with volume range more than 255? I use a bit more
1300          * to be sure. 384 is a resolution magic number found on Logitech
1301          * devices. It will definitively catch all buggy Logitech devices.
1302          */
1303         if (range > 384) {
1304                 snd_printk(KERN_WARNING "usb_audio: Warning! Unlikely big "
1305                            "volume range (=%u), cval->res is probably wrong.",
1306                            range);
1307                 snd_printk(KERN_WARNING "usb_audio: [%d] FU [%s] ch = %d, "
1308                            "val = %d/%d/%d", cval->id,
1309                            kctl->id.name, cval->channels,
1310                            cval->min, cval->max, cval->res);
1311         }
1312 
1313         snd_printdd(KERN_INFO "[%d] FU [%s] ch = %d, val = %d/%d/%d\n",
1314                     cval->id, kctl->id.name, cval->channels, cval->min, cval->max, cval->res);
1315         snd_usb_mixer_add_control(state->mixer, kctl);
1316 }
1317 
1318 
1319 
1320 /*
1321  * parse a feature unit
1322  *
1323  * most of controls are defined here.
1324  */
1325 static int parse_audio_feature_unit(struct mixer_build *state, int unitid, void *_ftr)
1326 {
1327         int channels, i, j;
1328         struct usb_audio_term iterm;
1329         unsigned int master_bits, first_ch_bits;
1330         int err, csize;
1331         struct uac_feature_unit_descriptor *hdr = _ftr;
1332         __u8 *bmaControls;
1333 
1334         if (state->mixer->protocol == UAC_VERSION_1) {
1335                 csize = hdr->bControlSize;
1336                 if (!csize) {
1337                         snd_printdd(KERN_ERR "usbaudio: unit %u: "
1338                                     "invalid bControlSize == 0\n", unitid);
1339                         return -EINVAL;
1340                 }
1341                 channels = (hdr->bLength - 7) / csize - 1;
1342                 bmaControls = hdr->bmaControls;
1343                 if (hdr->bLength < 7 + csize) {
1344                         snd_printk(KERN_ERR "usbaudio: unit %u: "
1345                                    "invalid UAC_FEATURE_UNIT descriptor\n",
1346                                    unitid);
1347                         return -EINVAL;
1348                 }
1349         } else {
1350                 struct uac2_feature_unit_descriptor *ftr = _ftr;
1351                 csize = 4;
1352                 channels = (hdr->bLength - 6) / 4 - 1;
1353                 bmaControls = ftr->bmaControls;
1354                 if (hdr->bLength < 6 + csize) {
1355                         snd_printk(KERN_ERR "usbaudio: unit %u: "
1356                                    "invalid UAC_FEATURE_UNIT descriptor\n",
1357                                    unitid);
1358                         return -EINVAL;
1359                 }
1360         }
1361 
1362         /* parse the source unit */
1363         if ((err = parse_audio_unit(state, hdr->bSourceID)) < 0)
1364                 return err;
1365 
1366         /* determine the input source type and name */
1367         err = check_input_term(state, hdr->bSourceID, &iterm);
1368         if (err < 0)
1369                 return err;
1370 
1371         master_bits = snd_usb_combine_bytes(bmaControls, csize);
1372         /* master configuration quirks */
1373         switch (state->chip->usb_id) {
1374         case USB_ID(0x08bb, 0x2702):
1375                 snd_printk(KERN_INFO
1376                            "usbmixer: master volume quirk for PCM2702 chip\n");
1377                 /* disable non-functional volume control */
1378                 master_bits &= ~UAC_CONTROL_BIT(UAC_FU_VOLUME);
1379                 break;
1380         case USB_ID(0x1130, 0xf211):
1381                 snd_printk(KERN_INFO
1382                            "usbmixer: volume control quirk for Tenx TP6911 Audio Headset\n");
1383                 /* disable non-functional volume control */
1384                 channels = 0;
1385                 break;
1386 
1387         }
1388         if (channels > 0)
1389                 first_ch_bits = snd_usb_combine_bytes(bmaControls + csize, csize);
1390         else
1391                 first_ch_bits = 0;
1392 
1393         if (state->mixer->protocol == UAC_VERSION_1) {
1394                 /* check all control types */
1395                 for (i = 0; i < 10; i++) {
1396                         unsigned int ch_bits = 0;
1397                         for (j = 0; j < channels; j++) {
1398                                 unsigned int mask = snd_usb_combine_bytes(bmaControls + csize * (j+1), csize);
1399                                 if (mask & (1 << i))
1400                                         ch_bits |= (1 << j);
1401                         }
1402                         /* audio class v1 controls are never read-only */
1403                         if (ch_bits & 1) /* the first channel must be set (for ease of programming) */
1404                                 build_feature_ctl(state, _ftr, ch_bits, i, &iterm, unitid, 0);
1405                         if (master_bits & (1 << i))
1406                                 build_feature_ctl(state, _ftr, 0, i, &iterm, unitid, 0);
1407                 }
1408         } else { /* UAC_VERSION_2 */
1409                 for (i = 0; i < ARRAY_SIZE(audio_feature_info); i++) {
1410                         unsigned int ch_bits = 0;
1411                         unsigned int ch_read_only = 0;
1412 
1413                         for (j = 0; j < channels; j++) {
1414                                 unsigned int mask = snd_usb_combine_bytes(bmaControls + csize * (j+1), csize);
1415                                 if (uac2_control_is_readable(mask, i)) {
1416                                         ch_bits |= (1 << j);
1417                                         if (!uac2_control_is_writeable(mask, i))
1418                                                 ch_read_only |= (1 << j);
1419                                 }
1420                         }
1421 
1422                         /* NOTE: build_feature_ctl() will mark the control read-only if all channels
1423                          * are marked read-only in the descriptors. Otherwise, the control will be
1424                          * reported as writeable, but the driver will not actually issue a write
1425                          * command for read-only channels */
1426                         if (ch_bits & 1) /* the first channel must be set (for ease of programming) */
1427                                 build_feature_ctl(state, _ftr, ch_bits, i, &iterm, unitid, ch_read_only);
1428                         if (uac2_control_is_readable(master_bits, i))
1429                                 build_feature_ctl(state, _ftr, 0, i, &iterm, unitid,
1430                                                   !uac2_control_is_writeable(master_bits, i));
1431                 }
1432         }
1433 
1434         return 0;
1435 }
1436 
1437 
1438 /*
1439  * Mixer Unit
1440  */
1441 
1442 /*
1443  * build a mixer unit control
1444  *
1445  * the callbacks are identical with feature unit.
1446  * input channel number (zero based) is given in control field instead.
1447  */
1448 
1449 static void build_mixer_unit_ctl(struct mixer_build *state,
1450                                  struct uac_mixer_unit_descriptor *desc,
1451                                  int in_pin, int in_ch, int unitid,
1452                                  struct usb_audio_term *iterm)
1453 {
1454         struct usb_mixer_elem_info *cval;
1455         unsigned int num_outs = uac_mixer_unit_bNrChannels(desc);
1456         unsigned int i, len;
1457         struct snd_kcontrol *kctl;
1458         const struct usbmix_name_map *map;
1459 
1460         map = find_map(state, unitid, 0);
1461         if (check_ignored_ctl(map))
1462                 return;
1463 
1464         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1465         if (! cval)
1466                 return;
1467 
1468         cval->mixer = state->mixer;
1469         cval->id = unitid;
1470         cval->control = in_ch + 1; /* based on 1 */
1471         cval->val_type = USB_MIXER_S16;
1472         for (i = 0; i < num_outs; i++) {
1473                 if (check_matrix_bitmap(uac_mixer_unit_bmControls(desc, state->mixer->protocol), in_ch, i, num_outs)) {
1474                         cval->cmask |= (1 << i);
1475                         cval->channels++;
1476                 }
1477         }
1478 
1479         /* get min/max values */
1480         get_min_max(cval, 0);
1481 
1482         kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
1483         if (! kctl) {
1484                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1485                 kfree(cval);
1486                 return;
1487         }
1488         kctl->private_free = usb_mixer_elem_free;
1489 
1490         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
1491         if (! len)
1492                 len = get_term_name(state, iterm, kctl->id.name, sizeof(kctl->id.name), 0);
1493         if (! len)
1494                 len = sprintf(kctl->id.name, "Mixer Source %d", in_ch + 1);
1495         append_ctl_name(kctl, " Volume");
1496 
1497         snd_printdd(KERN_INFO "[%d] MU [%s] ch = %d, val = %d/%d\n",
1498                     cval->id, kctl->id.name, cval->channels, cval->min, cval->max);
1499         snd_usb_mixer_add_control(state->mixer, kctl);
1500 }
1501 
1502 
1503 /*
1504  * parse a mixer unit
1505  */
1506 static int parse_audio_mixer_unit(struct mixer_build *state, int unitid, void *raw_desc)
1507 {
1508         struct uac_mixer_unit_descriptor *desc = raw_desc;
1509         struct usb_audio_term iterm;
1510         int input_pins, num_ins, num_outs;
1511         int pin, ich, err;
1512 
1513         if (desc->bLength < 11 || ! (input_pins = desc->bNrInPins) || ! (num_outs = uac_mixer_unit_bNrChannels(desc))) {
1514                 snd_printk(KERN_ERR "invalid MIXER UNIT descriptor %d\n", unitid);
1515                 return -EINVAL;
1516         }
1517         /* no bmControls field (e.g. Maya44) -> ignore */
1518         if (desc->bLength <= 10 + input_pins) {
1519                 snd_printdd(KERN_INFO "MU %d has no bmControls field\n", unitid);
1520                 return 0;
1521         }
1522 
1523         num_ins = 0;
1524         ich = 0;
1525         for (pin = 0; pin < input_pins; pin++) {
1526                 err = parse_audio_unit(state, desc->baSourceID[pin]);
1527                 if (err < 0)
1528                         continue;
1529                 err = check_input_term(state, desc->baSourceID[pin], &iterm);
1530                 if (err < 0)
1531                         return err;
1532                 num_ins += iterm.channels;
1533                 for (; ich < num_ins; ++ich) {
1534                         int och, ich_has_controls = 0;
1535 
1536                         for (och = 0; och < num_outs; ++och) {
1537                                 if (check_matrix_bitmap(uac_mixer_unit_bmControls(desc, state->mixer->protocol),
1538                                                         ich, och, num_outs)) {
1539                                         ich_has_controls = 1;
1540                                         break;
1541                                 }
1542                         }
1543                         if (ich_has_controls)
1544                                 build_mixer_unit_ctl(state, desc, pin, ich,
1545                                                      unitid, &iterm);
1546                 }
1547         }
1548         return 0;
1549 }
1550 
1551 
1552 /*
1553  * Processing Unit / Extension Unit
1554  */
1555 
1556 /* get callback for processing/extension unit */
1557 static int mixer_ctl_procunit_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1558 {
1559         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1560         int err, val;
1561 
1562         err = get_cur_ctl_value(cval, cval->control << 8, &val);
1563         if (err < 0 && cval->mixer->ignore_ctl_error) {
1564                 ucontrol->value.integer.value[0] = cval->min;
1565                 return 0;
1566         }
1567         if (err < 0)
1568                 return err;
1569         val = get_relative_value(cval, val);
1570         ucontrol->value.integer.value[0] = val;
1571         return 0;
1572 }
1573 
1574 /* put callback for processing/extension unit */
1575 static int mixer_ctl_procunit_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1576 {
1577         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1578         int val, oval, err;
1579 
1580         err = get_cur_ctl_value(cval, cval->control << 8, &oval);
1581         if (err < 0) {
1582                 if (cval->mixer->ignore_ctl_error)
1583                         return 0;
1584                 return err;
1585         }
1586         val = ucontrol->value.integer.value[0];
1587         val = get_abs_value(cval, val);
1588         if (val != oval) {
1589                 set_cur_ctl_value(cval, cval->control << 8, val);
1590                 return 1;
1591         }
1592         return 0;
1593 }
1594 
1595 /* alsa control interface for processing/extension unit */
1596 static struct snd_kcontrol_new mixer_procunit_ctl = {
1597         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1598         .name = "", /* will be filled later */
1599         .info = mixer_ctl_feature_info,
1600         .get = mixer_ctl_procunit_get,
1601         .put = mixer_ctl_procunit_put,
1602 };
1603 
1604 
1605 /*
1606  * predefined data for processing units
1607  */
1608 struct procunit_value_info {
1609         int control;
1610         char *suffix;
1611         int val_type;
1612         int min_value;
1613 };
1614 
1615 struct procunit_info {
1616         int type;
1617         char *name;
1618         struct procunit_value_info *values;
1619 };
1620 
1621 static struct procunit_value_info updown_proc_info[] = {
1622         { UAC_UD_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1623         { UAC_UD_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
1624         { 0 }
1625 };
1626 static struct procunit_value_info prologic_proc_info[] = {
1627         { UAC_DP_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1628         { UAC_DP_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
1629         { 0 }
1630 };
1631 static struct procunit_value_info threed_enh_proc_info[] = {
1632         { UAC_3D_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1633         { UAC_3D_SPACE, "Spaciousness", USB_MIXER_U8 },
1634         { 0 }
1635 };
1636 static struct procunit_value_info reverb_proc_info[] = {
1637         { UAC_REVERB_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1638         { UAC_REVERB_LEVEL, "Level", USB_MIXER_U8 },
1639         { UAC_REVERB_TIME, "Time", USB_MIXER_U16 },
1640         { UAC_REVERB_FEEDBACK, "Feedback", USB_MIXER_U8 },
1641         { 0 }
1642 };
1643 static struct procunit_value_info chorus_proc_info[] = {
1644         { UAC_CHORUS_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1645         { UAC_CHORUS_LEVEL, "Level", USB_MIXER_U8 },
1646         { UAC_CHORUS_RATE, "Rate", USB_MIXER_U16 },
1647         { UAC_CHORUS_DEPTH, "Depth", USB_MIXER_U16 },
1648         { 0 }
1649 };
1650 static struct procunit_value_info dcr_proc_info[] = {
1651         { UAC_DCR_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1652         { UAC_DCR_RATE, "Ratio", USB_MIXER_U16 },
1653         { UAC_DCR_MAXAMPL, "Max Amp", USB_MIXER_S16 },
1654         { UAC_DCR_THRESHOLD, "Threshold", USB_MIXER_S16 },
1655         { UAC_DCR_ATTACK_TIME, "Attack Time", USB_MIXER_U16 },
1656         { UAC_DCR_RELEASE_TIME, "Release Time", USB_MIXER_U16 },
1657         { 0 }
1658 };
1659 
1660 static struct procunit_info procunits[] = {
1661         { UAC_PROCESS_UP_DOWNMIX, "Up Down", updown_proc_info },
1662         { UAC_PROCESS_DOLBY_PROLOGIC, "Dolby Prologic", prologic_proc_info },
1663         { UAC_PROCESS_STEREO_EXTENDER, "3D Stereo Extender", threed_enh_proc_info },
1664         { UAC_PROCESS_REVERB, "Reverb", reverb_proc_info },
1665         { UAC_PROCESS_CHORUS, "Chorus", chorus_proc_info },
1666         { UAC_PROCESS_DYN_RANGE_COMP, "DCR", dcr_proc_info },
1667         { 0 },
1668 };
1669 /*
1670  * predefined data for extension units
1671  */
1672 static struct procunit_value_info clock_rate_xu_info[] = {
1673         { USB_XU_CLOCK_RATE_SELECTOR, "Selector", USB_MIXER_U8, 0 },
1674         { 0 }
1675 };
1676 static struct procunit_value_info clock_source_xu_info[] = {
1677         { USB_XU_CLOCK_SOURCE_SELECTOR, "External", USB_MIXER_BOOLEAN },
1678         { 0 }
1679 };
1680 static struct procunit_value_info spdif_format_xu_info[] = {
1681         { USB_XU_DIGITAL_FORMAT_SELECTOR, "SPDIF/AC3", USB_MIXER_BOOLEAN },
1682         { 0 }
1683 };
1684 static struct procunit_value_info soft_limit_xu_info[] = {
1685         { USB_XU_SOFT_LIMIT_SELECTOR, " ", USB_MIXER_BOOLEAN },
1686         { 0 }
1687 };
1688 static struct procunit_info extunits[] = {
1689         { USB_XU_CLOCK_RATE, "Clock rate", clock_rate_xu_info },
1690         { USB_XU_CLOCK_SOURCE, "DigitalIn CLK source", clock_source_xu_info },
1691         { USB_XU_DIGITAL_IO_STATUS, "DigitalOut format:", spdif_format_xu_info },
1692         { USB_XU_DEVICE_OPTIONS, "AnalogueIn Soft Limit", soft_limit_xu_info },
1693         { 0 }
1694 };
1695 /*
1696  * build a processing/extension unit
1697  */
1698 static int build_audio_procunit(struct mixer_build *state, int unitid, void *raw_desc, struct procunit_info *list, char *name)
1699 {
1700         struct uac_processing_unit_descriptor *desc = raw_desc;
1701         int num_ins = desc->bNrInPins;
1702         struct usb_mixer_elem_info *cval;
1703         struct snd_kcontrol *kctl;
1704         int i, err, nameid, type, len;
1705         struct procunit_info *info;
1706         struct procunit_value_info *valinfo;
1707         const struct usbmix_name_map *map;
1708         static struct procunit_value_info default_value_info[] = {
1709                 { 0x01, "Switch", USB_MIXER_BOOLEAN },
1710                 { 0 }
1711         };
1712         static struct procunit_info default_info = {
1713                 0, NULL, default_value_info
1714         };
1715 
1716         if (desc->bLength < 13 || desc->bLength < 13 + num_ins ||
1717             desc->bLength < num_ins + uac_processing_unit_bControlSize(desc, state->mixer->protocol)) {
1718                 snd_printk(KERN_ERR "invalid %s descriptor (id %d)\n", name, unitid);
1719                 return -EINVAL;
1720         }
1721 
1722         for (i = 0; i < num_ins; i++) {
1723                 if ((err = parse_audio_unit(state, desc->baSourceID[i])) < 0)
1724                         return err;
1725         }
1726 
1727         type = le16_to_cpu(desc->wProcessType);
1728         for (info = list; info && info->type; info++)
1729                 if (info->type == type)
1730                         break;
1731         if (! info || ! info->type)
1732                 info = &default_info;
1733 
1734         for (valinfo = info->values; valinfo->control; valinfo++) {
1735                 __u8 *controls = uac_processing_unit_bmControls(desc, state->mixer->protocol);
1736 
1737                 if (! (controls[valinfo->control / 8] & (1 << ((valinfo->control % 8) - 1))))
1738                         continue;
1739                 map = find_map(state, unitid, valinfo->control);
1740                 if (check_ignored_ctl(map))
1741                         continue;
1742                 cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1743                 if (! cval) {
1744                         snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1745                         return -ENOMEM;
1746                 }
1747                 cval->mixer = state->mixer;
1748                 cval->id = unitid;
1749                 cval->control = valinfo->control;
1750                 cval->val_type = valinfo->val_type;
1751                 cval->channels = 1;
1752 
1753                 /* get min/max values */
1754                 if (type == UAC_PROCESS_UP_DOWNMIX && cval->control == UAC_UD_MODE_SELECT) {
1755                         __u8 *control_spec = uac_processing_unit_specific(desc, state->mixer->protocol);
1756                         /* FIXME: hard-coded */
1757                         cval->min = 1;
1758                         cval->max = control_spec[0];
1759                         cval->res = 1;
1760                         cval->initialized = 1;
1761                 } else {
1762                         if (type == USB_XU_CLOCK_RATE) {
1763                                 /* E-Mu USB 0404/0202/TrackerPre/0204
1764                                  * samplerate control quirk
1765                                  */
1766                                 cval->min = 0;
1767                                 cval->max = 5;
1768                                 cval->res = 1;
1769                                 cval->initialized = 1;
1770                         } else
1771                                 get_min_max(cval, valinfo->min_value);
1772                 }
1773 
1774                 kctl = snd_ctl_new1(&mixer_procunit_ctl, cval);
1775                 if (! kctl) {
1776                         snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1777                         kfree(cval);
1778                         return -ENOMEM;
1779                 }
1780                 kctl->private_free = usb_mixer_elem_free;
1781 
1782                 if (check_mapped_name(map, kctl->id.name,
1783                                                 sizeof(kctl->id.name)))
1784                         /* nothing */ ;
1785                 else if (info->name)
1786                         strlcpy(kctl->id.name, info->name, sizeof(kctl->id.name));
1787                 else {
1788                         nameid = uac_processing_unit_iProcessing(desc, state->mixer->protocol);
1789                         len = 0;
1790                         if (nameid)
1791                                 len = snd_usb_copy_string_desc(state, nameid, kctl->id.name, sizeof(kctl->id.name));
1792                         if (! len)
1793                                 strlcpy(kctl->id.name, name, sizeof(kctl->id.name));
1794                 }
1795                 append_ctl_name(kctl, " ");
1796                 append_ctl_name(kctl, valinfo->suffix);
1797 
1798                 snd_printdd(KERN_INFO "[%d] PU [%s] ch = %d, val = %d/%d\n",
1799                             cval->id, kctl->id.name, cval->channels, cval->min, cval->max);
1800                 if ((err = snd_usb_mixer_add_control(state->mixer, kctl)) < 0)
1801                         return err;
1802         }
1803         return 0;
1804 }
1805 
1806 
1807 static int parse_audio_processing_unit(struct mixer_build *state, int unitid, void *raw_desc)
1808 {
1809         return build_audio_procunit(state, unitid, raw_desc, procunits, "Processing Unit");
1810 }
1811 
1812 static int parse_audio_extension_unit(struct mixer_build *state, int unitid, void *raw_desc)
1813 {
1814         /* Note that we parse extension units with processing unit descriptors.
1815          * That's ok as the layout is the same */
1816         return build_audio_procunit(state, unitid, raw_desc, extunits, "Extension Unit");
1817 }
1818 
1819 
1820 /*
1821  * Selector Unit
1822  */
1823 
1824 /* info callback for selector unit
1825  * use an enumerator type for routing
1826  */
1827 static int mixer_ctl_selector_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
1828 {
1829         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1830         const char **itemlist = (const char **)kcontrol->private_value;
1831 
1832         if (snd_BUG_ON(!itemlist))
1833                 return -EINVAL;
1834         return snd_ctl_enum_info(uinfo, 1, cval->max, itemlist);
1835 }
1836 
1837 /* get callback for selector unit */
1838 static int mixer_ctl_selector_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1839 {
1840         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1841         int val, err;
1842 
1843         err = get_cur_ctl_value(cval, cval->control << 8, &val);
1844         if (err < 0) {
1845                 if (cval->mixer->ignore_ctl_error) {
1846                         ucontrol->value.enumerated.item[0] = 0;
1847                         return 0;
1848                 }
1849                 return err;
1850         }
1851         val = get_relative_value(cval, val);
1852         ucontrol->value.enumerated.item[0] = val;
1853         return 0;
1854 }
1855 
1856 /* put callback for selector unit */
1857 static int mixer_ctl_selector_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1858 {
1859         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1860         int val, oval, err;
1861 
1862         err = get_cur_ctl_value(cval, cval->control << 8, &oval);
1863         if (err < 0) {
1864                 if (cval->mixer->ignore_ctl_error)
1865                         return 0;
1866                 return err;
1867         }
1868         val = ucontrol->value.enumerated.item[0];
1869         val = get_abs_value(cval, val);
1870         if (val != oval) {
1871                 set_cur_ctl_value(cval, cval->control << 8, val);
1872                 return 1;
1873         }
1874         return 0;
1875 }
1876 
1877 /* alsa control interface for selector unit */
1878 static struct snd_kcontrol_new mixer_selectunit_ctl = {
1879         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1880         .name = "", /* will be filled later */
1881         .info = mixer_ctl_selector_info,
1882         .get = mixer_ctl_selector_get,
1883         .put = mixer_ctl_selector_put,
1884 };
1885 
1886 
1887 /* private free callback.
1888  * free both private_data and private_value
1889  */
1890 static void usb_mixer_selector_elem_free(struct snd_kcontrol *kctl)
1891 {
1892         int i, num_ins = 0;
1893 
1894         if (kctl->private_data) {
1895                 struct usb_mixer_elem_info *cval = kctl->private_data;
1896                 num_ins = cval->max;
1897                 kfree(cval);
1898                 kctl->private_data = NULL;
1899         }
1900         if (kctl->private_value) {
1901                 char **itemlist = (char **)kctl->private_value;
1902                 for (i = 0; i < num_ins; i++)
1903                         kfree(itemlist[i]);
1904                 kfree(itemlist);
1905                 kctl->private_value = 0;
1906         }
1907 }
1908 
1909 /*
1910  * parse a selector unit
1911  */
1912 static int parse_audio_selector_unit(struct mixer_build *state, int unitid, void *raw_desc)
1913 {
1914         struct uac_selector_unit_descriptor *desc = raw_desc;
1915         unsigned int i, nameid, len;
1916         int err;
1917         struct usb_mixer_elem_info *cval;
1918         struct snd_kcontrol *kctl;
1919         const struct usbmix_name_map *map;
1920         char **namelist;
1921 
1922         if (!desc->bNrInPins || desc->bLength < 5 + desc->bNrInPins) {
1923                 snd_printk(KERN_ERR "invalid SELECTOR UNIT descriptor %d\n", unitid);
1924                 return -EINVAL;
1925         }
1926 
1927         for (i = 0; i < desc->bNrInPins; i++) {
1928                 if ((err = parse_audio_unit(state, desc->baSourceID[i])) < 0)
1929                         return err;
1930         }
1931 
1932         if (desc->bNrInPins == 1) /* only one ? nonsense! */
1933                 return 0;
1934 
1935         map = find_map(state, unitid, 0);
1936         if (check_ignored_ctl(map))
1937                 return 0;
1938 
1939         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1940         if (! cval) {
1941                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1942                 return -ENOMEM;
1943         }
1944         cval->mixer = state->mixer;
1945         cval->id = unitid;
1946         cval->val_type = USB_MIXER_U8;
1947         cval->channels = 1;
1948         cval->min = 1;
1949         cval->max = desc->bNrInPins;
1950         cval->res = 1;
1951         cval->initialized = 1;
1952 
1953         if (desc->bDescriptorSubtype == UAC2_CLOCK_SELECTOR)
1954                 cval->control = UAC2_CX_CLOCK_SELECTOR;
1955         else
1956                 cval->control = 0;
1957 
1958         namelist = kmalloc(sizeof(char *) * desc->bNrInPins, GFP_KERNEL);
1959         if (! namelist) {
1960                 snd_printk(KERN_ERR "cannot malloc\n");
1961                 kfree(cval);
1962                 return -ENOMEM;
1963         }
1964 #define MAX_ITEM_NAME_LEN       64
1965         for (i = 0; i < desc->bNrInPins; i++) {
1966                 struct usb_audio_term iterm;
1967                 len = 0;
1968                 namelist[i] = kmalloc(MAX_ITEM_NAME_LEN, GFP_KERNEL);
1969                 if (! namelist[i]) {
1970                         snd_printk(KERN_ERR "cannot malloc\n");
1971                         while (i--)
1972                                 kfree(namelist[i]);
1973                         kfree(namelist);
1974                         kfree(cval);
1975                         return -ENOMEM;
1976                 }
1977                 len = check_mapped_selector_name(state, unitid, i, namelist[i],
1978                                                  MAX_ITEM_NAME_LEN);
1979                 if (! len && check_input_term(state, desc->baSourceID[i], &iterm) >= 0)
1980                         len = get_term_name(state, &iterm, namelist[i], MAX_ITEM_NAME_LEN, 0);
1981                 if (! len)
1982                         sprintf(namelist[i], "Input %d", i);
1983         }
1984 
1985         kctl = snd_ctl_new1(&mixer_selectunit_ctl, cval);
1986         if (! kctl) {
1987                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1988                 kfree(namelist);
1989                 kfree(cval);
1990                 return -ENOMEM;
1991         }
1992         kctl->private_value = (unsigned long)namelist;
1993         kctl->private_free = usb_mixer_selector_elem_free;
1994 
1995         nameid = uac_selector_unit_iSelector(desc);
1996         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
1997         if (len)
1998                 ;
1999         else if (nameid)
2000                 snd_usb_copy_string_desc(state, nameid, kctl->id.name, sizeof(kctl->id.name));
2001         else {
2002                 len = get_term_name(state, &state->oterm,
2003                                     kctl->id.name, sizeof(kctl->id.name), 0);
2004                 if (! len)
2005                         strlcpy(kctl->id.name, "USB", sizeof(kctl->id.name));
2006 
2007                 if (desc->bDescriptorSubtype == UAC2_CLOCK_SELECTOR)
2008                         append_ctl_name(kctl, " Clock Source");
2009                 else if ((state->oterm.type & 0xff00) == 0x0100)
2010                         append_ctl_name(kctl, " Capture Source");
2011                 else
2012                         append_ctl_name(kctl, " Playback Source");
2013         }
2014 
2015         snd_printdd(KERN_INFO "[%d] SU [%s] items = %d\n",
2016                     cval->id, kctl->id.name, desc->bNrInPins);
2017         if ((err = snd_usb_mixer_add_control(state->mixer, kctl)) < 0)
2018                 return err;
2019 
2020         return 0;
2021 }
2022 
2023 
2024 /*
2025  * parse an audio unit recursively
2026  */
2027 
2028 static int parse_audio_unit(struct mixer_build *state, int unitid)
2029 {
2030         unsigned char *p1;
2031 
2032         if (test_and_set_bit(unitid, state->unitbitmap))
2033                 return 0; /* the unit already visited */
2034 
2035         p1 = find_audio_control_unit(state, unitid);
2036         if (!p1) {
2037                 snd_printk(KERN_ERR "usbaudio: unit %d not found!\n", unitid);
2038                 return -EINVAL;
2039         }
2040 
2041         switch (p1[2]) {
2042         case UAC_INPUT_TERMINAL:
2043         case UAC2_CLOCK_SOURCE:
2044                 return 0; /* NOP */
2045         case UAC_MIXER_UNIT:
2046                 return parse_audio_mixer_unit(state, unitid, p1);
2047         case UAC_SELECTOR_UNIT:
2048         case UAC2_CLOCK_SELECTOR:
2049                 return parse_audio_selector_unit(state, unitid, p1);
2050         case UAC_FEATURE_UNIT:
2051                 return parse_audio_feature_unit(state, unitid, p1);
2052         case UAC1_PROCESSING_UNIT:
2053         /*   UAC2_EFFECT_UNIT has the same value */
2054                 if (state->mixer->protocol == UAC_VERSION_1)
2055                         return parse_audio_processing_unit(state, unitid, p1);
2056                 else
2057                         return 0; /* FIXME - effect units not implemented yet */
2058         case UAC1_EXTENSION_UNIT:
2059         /*   UAC2_PROCESSING_UNIT_V2 has the same value */
2060                 if (state->mixer->protocol == UAC_VERSION_1)
2061                         return parse_audio_extension_unit(state, unitid, p1);
2062                 else /* UAC_VERSION_2 */
2063                         return parse_audio_processing_unit(state, unitid, p1);
2064         case UAC2_EXTENSION_UNIT_V2:
2065                 return parse_audio_extension_unit(state, unitid, p1);
2066         default:
2067                 snd_printk(KERN_ERR "usbaudio: unit %u: unexpected type 0x%02x\n", unitid, p1[2]);
2068                 return -EINVAL;
2069         }
2070 }
2071 
2072 static void snd_usb_mixer_free(struct usb_mixer_interface *mixer)
2073 {
2074         kfree(mixer->id_elems);
2075         if (mixer->urb) {
2076                 kfree(mixer->urb->transfer_buffer);
2077                 usb_free_urb(mixer->urb);
2078         }
2079         usb_free_urb(mixer->rc_urb);
2080         kfree(mixer->rc_setup_packet);
2081         kfree(mixer);
2082 }
2083 
2084 static int snd_usb_mixer_dev_free(struct snd_device *device)
2085 {
2086         struct usb_mixer_interface *mixer = device->device_data;
2087         snd_usb_mixer_free(mixer);
2088         return 0;
2089 }
2090 
2091 /*
2092  * create mixer controls
2093  *
2094  * walk through all UAC_OUTPUT_TERMINAL descriptors to search for mixers
2095  */
2096 static int snd_usb_mixer_controls(struct usb_mixer_interface *mixer)
2097 {
2098         struct mixer_build state;
2099         int err;
2100         const struct usbmix_ctl_map *map;
2101         void *p;
2102 
2103         memset(&state, 0, sizeof(state));
2104         state.chip = mixer->chip;
2105         state.mixer = mixer;
2106         state.buffer = mixer->hostif->extra;
2107         state.buflen = mixer->hostif->extralen;
2108 
2109         /* check the mapping table */
2110         for (map = usbmix_ctl_maps; map->id; map++) {
2111                 if (map->id == state.chip->usb_id) {
2112                         state.map = map->map;
2113                         state.selector_map = map->selector_map;
2114                         mixer->ignore_ctl_error = map->ignore_ctl_error;
2115                         break;
2116                 }
2117         }
2118 
2119         p = NULL;
2120         while ((p = snd_usb_find_csint_desc(mixer->hostif->extra, mixer->hostif->extralen,
2121                                             p, UAC_OUTPUT_TERMINAL)) != NULL) {
2122                 if (mixer->protocol == UAC_VERSION_1) {
2123                         struct uac1_output_terminal_descriptor *desc = p;
2124 
2125                         if (desc->bLength < sizeof(*desc))
2126                                 continue; /* invalid descriptor? */
2127                         set_bit(desc->bTerminalID, state.unitbitmap);  /* mark terminal ID as visited */
2128                         state.oterm.id = desc->bTerminalID;
2129                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
2130                         state.oterm.name = desc->iTerminal;
2131                         err = parse_audio_unit(&state, desc->bSourceID);
2132                         if (err < 0 && err != -EINVAL)
2133                                 return err;
2134                 } else { /* UAC_VERSION_2 */
2135                         struct uac2_output_terminal_descriptor *desc = p;
2136 
2137                         if (desc->bLength < sizeof(*desc))
2138                                 continue; /* invalid descriptor? */
2139                         set_bit(desc->bTerminalID, state.unitbitmap);  /* mark terminal ID as visited */
2140                         state.oterm.id = desc->bTerminalID;
2141                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
2142                         state.oterm.name = desc->iTerminal;
2143                         err = parse_audio_unit(&state, desc->bSourceID);
2144                         if (err < 0 && err != -EINVAL)
2145                                 return err;
2146 
2147                         /* for UAC2, use the same approach to also add the clock selectors */
2148                         err = parse_audio_unit(&state, desc->bCSourceID);
2149                         if (err < 0 && err != -EINVAL)
2150                                 return err;
2151                 }
2152         }
2153 
2154         return 0;
2155 }
2156 
2157 void snd_usb_mixer_notify_id(struct usb_mixer_interface *mixer, int unitid)
2158 {
2159         struct usb_mixer_elem_info *info;
2160 
2161         for (info = mixer->id_elems[unitid]; info; info = info->next_id_elem)
2162                 snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
2163                                info->elem_id);
2164 }
2165 
2166 static void snd_usb_mixer_dump_cval(struct snd_info_buffer *buffer,
2167                                     int unitid,
2168                                     struct usb_mixer_elem_info *cval)
2169 {
2170         static char *val_types[] = {"BOOLEAN", "INV_BOOLEAN",
2171                                     "S8", "U8", "S16", "U16"};
2172         snd_iprintf(buffer, "  Unit: %i\n", unitid);
2173         if (cval->elem_id)
2174                 snd_iprintf(buffer, "    Control: name=\"%s\", index=%i\n",
2175                                 cval->elem_id->name, cval->elem_id->index);
2176         snd_iprintf(buffer, "    Info: id=%i, control=%i, cmask=0x%x, "
2177                             "channels=%i, type=\"%s\"\n", cval->id,
2178                             cval->control, cval->cmask, cval->channels,
2179                             val_types[cval->val_type]);
2180         snd_iprintf(buffer, "    Volume: min=%i, max=%i, dBmin=%i, dBmax=%i\n",
2181                             cval->min, cval->max, cval->dBmin, cval->dBmax);
2182 }
2183 
2184 static void snd_usb_mixer_proc_read(struct snd_info_entry *entry,
2185                                     struct snd_info_buffer *buffer)
2186 {
2187         struct snd_usb_audio *chip = entry->private_data;
2188         struct usb_mixer_interface *mixer;
2189         struct usb_mixer_elem_info *cval;
2190         int unitid;
2191 
2192         list_for_each_entry(mixer, &chip->mixer_list, list) {
2193                 snd_iprintf(buffer,
2194                         "USB Mixer: usb_id=0x%08x, ctrlif=%i, ctlerr=%i\n",
2195                                 chip->usb_id, snd_usb_ctrl_intf(chip),
2196                                 mixer->ignore_ctl_error);
2197                 snd_iprintf(buffer, "Card: %s\n", chip->card->longname);
2198                 for (unitid = 0; unitid < MAX_ID_ELEMS; unitid++) {
2199                         for (cval = mixer->id_elems[unitid]; cval;
2200                                                 cval = cval->next_id_elem)
2201                                 snd_usb_mixer_dump_cval(buffer, unitid, cval);
2202                 }
2203         }
2204 }
2205 
2206 static void snd_usb_mixer_interrupt_v2(struct usb_mixer_interface *mixer,
2207                                        int attribute, int value, int index)
2208 {
2209         struct usb_mixer_elem_info *info;
2210         __u8 unitid = (index >> 8) & 0xff;
2211         __u8 control = (value >> 8) & 0xff;
2212         __u8 channel = value & 0xff;
2213 
2214         if (channel >= MAX_CHANNELS) {
2215                 snd_printk(KERN_DEBUG "%s(): bogus channel number %d\n",
2216                                 __func__, channel);
2217                 return;
2218         }
2219 
2220         for (info = mixer->id_elems[unitid]; info; info = info->next_id_elem) {
2221                 if (info->control != control)
2222                         continue;
2223 
2224                 switch (attribute) {
2225                 case UAC2_CS_CUR:
2226                         /* invalidate cache, so the value is read from the device */
2227                         if (channel)
2228                                 info->cached &= ~(1 << channel);
2229                         else /* master channel */
2230                                 info->cached = 0;
2231 
2232                         snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
2233                                         info->elem_id);
2234                         break;
2235 
2236                 case UAC2_CS_RANGE:
2237                         /* TODO */
2238                         break;
2239 
2240                 case UAC2_CS_MEM:
2241                         /* TODO */
2242                         break;
2243 
2244                 default:
2245                         snd_printk(KERN_DEBUG "unknown attribute %d in interrupt\n",
2246                                                 attribute);
2247                         break;
2248                 } /* switch */
2249         }
2250 }
2251 
2252 static void snd_usb_mixer_interrupt(struct urb *urb)
2253 {
2254         struct usb_mixer_interface *mixer = urb->context;
2255         int len = urb->actual_length;
2256         int ustatus = urb->status;
2257 
2258         if (ustatus != 0)
2259                 goto requeue;
2260 
2261         if (mixer->protocol == UAC_VERSION_1) {
2262                 struct uac1_status_word *status;
2263 
2264                 for (status = urb->transfer_buffer;
2265                      len >= sizeof(*status);
2266                      len -= sizeof(*status), status++) {
2267                         snd_printd(KERN_DEBUG "status interrupt: %02x %02x\n",
2268                                                 status->bStatusType,
2269                                                 status->bOriginator);
2270 
2271                         /* ignore any notifications not from the control interface */
2272                         if ((status->bStatusType & UAC1_STATUS_TYPE_ORIG_MASK) !=
2273                                 UAC1_STATUS_TYPE_ORIG_AUDIO_CONTROL_IF)
2274                                 continue;
2275 
2276                         if (status->bStatusType & UAC1_STATUS_TYPE_MEM_CHANGED)
2277                                 snd_usb_mixer_rc_memory_change(mixer, status->bOriginator);
2278                         else
2279                                 snd_usb_mixer_notify_id(mixer, status->bOriginator);
2280                 }
2281         } else { /* UAC_VERSION_2 */
2282                 struct uac2_interrupt_data_msg *msg;
2283 
2284                 for (msg = urb->transfer_buffer;
2285                      len >= sizeof(*msg);
2286                      len -= sizeof(*msg), msg++) {
2287                         /* drop vendor specific and endpoint requests */
2288                         if ((msg->bInfo & UAC2_INTERRUPT_DATA_MSG_VENDOR) ||
2289                             (msg->bInfo & UAC2_INTERRUPT_DATA_MSG_EP))
2290                                 continue;
2291 
2292                         snd_usb_mixer_interrupt_v2(mixer, msg->bAttribute,
2293                                                    le16_to_cpu(msg->wValue),
2294                                                    le16_to_cpu(msg->wIndex));
2295                 }
2296         }
2297 
2298 requeue:
2299         if (ustatus != -ENOENT && ustatus != -ECONNRESET && ustatus != -ESHUTDOWN) {
2300                 urb->dev = mixer->chip->dev;
2301                 usb_submit_urb(urb, GFP_ATOMIC);
2302         }
2303 }
2304 
2305 /* stop any bus activity of a mixer */
2306 void snd_usb_mixer_inactivate(struct usb_mixer_interface *mixer)
2307 {
2308         usb_kill_urb(mixer->urb);
2309         usb_kill_urb(mixer->rc_urb);
2310 }
2311 
2312 int snd_usb_mixer_activate(struct usb_mixer_interface *mixer)
2313 {
2314         int err;
2315 
2316         if (mixer->urb) {
2317                 err = usb_submit_urb(mixer->urb, GFP_NOIO);
2318                 if (err < 0)
2319                         return err;
2320         }
2321 
2322         return 0;
2323 }
2324 
2325 /* create the handler for the optional status interrupt endpoint */
2326 static int snd_usb_mixer_status_create(struct usb_mixer_interface *mixer)
2327 {
2328         struct usb_endpoint_descriptor *ep;
2329         void *transfer_buffer;
2330         int buffer_length;
2331         unsigned int epnum;
2332 
2333         /* we need one interrupt input endpoint */
2334         if (get_iface_desc(mixer->hostif)->bNumEndpoints < 1)
2335                 return 0;
2336         ep = get_endpoint(mixer->hostif, 0);
2337         if (!usb_endpoint_dir_in(ep) || !usb_endpoint_xfer_int(ep))
2338                 return 0;
2339 
2340         epnum = usb_endpoint_num(ep);
2341         buffer_length = le16_to_cpu(ep->wMaxPacketSize);
2342         transfer_buffer = kmalloc(buffer_length, GFP_KERNEL);
2343         if (!transfer_buffer)
2344                 return -ENOMEM;
2345         mixer->urb = usb_alloc_urb(0, GFP_KERNEL);
2346         if (!mixer->urb) {
2347                 kfree(transfer_buffer);
2348                 return -ENOMEM;
2349         }
2350         usb_fill_int_urb(mixer->urb, mixer->chip->dev,
2351                          usb_rcvintpipe(mixer->chip->dev, epnum),
2352                          transfer_buffer, buffer_length,
2353                          snd_usb_mixer_interrupt, mixer, ep->bInterval);
2354         usb_submit_urb(mixer->urb, GFP_KERNEL);
2355         return 0;
2356 }
2357 
2358 int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif,
2359                          int ignore_error)
2360 {
2361         static struct snd_device_ops dev_ops = {
2362                 .dev_free = snd_usb_mixer_dev_free
2363         };
2364         struct usb_mixer_interface *mixer;
2365         struct snd_info_entry *entry;
2366         int err;
2367 
2368         strcpy(chip->card->mixername, "USB Mixer");
2369 
2370         mixer = kzalloc(sizeof(*mixer), GFP_KERNEL);
2371         if (!mixer)
2372                 return -ENOMEM;
2373         mixer->chip = chip;
2374         mixer->ignore_ctl_error = ignore_error;
2375         mixer->id_elems = kcalloc(MAX_ID_ELEMS, sizeof(*mixer->id_elems),
2376                                   GFP_KERNEL);
2377         if (!mixer->id_elems) {
2378                 kfree(mixer);
2379                 return -ENOMEM;
2380         }
2381 
2382         mixer->hostif = &usb_ifnum_to_if(chip->dev, ctrlif)->altsetting[0];
2383         switch (get_iface_desc(mixer->hostif)->bInterfaceProtocol) {
2384         case UAC_VERSION_1:
2385         default:
2386                 mixer->protocol = UAC_VERSION_1;
2387                 break;
2388         case UAC_VERSION_2:
2389                 mixer->protocol = UAC_VERSION_2;
2390                 break;
2391         }
2392 
2393         if ((err = snd_usb_mixer_controls(mixer)) < 0 ||
2394             (err = snd_usb_mixer_status_create(mixer)) < 0)
2395                 goto _error;
2396 
2397         snd_usb_mixer_apply_create_quirk(mixer);
2398 
2399         err = snd_device_new(chip->card, SNDRV_DEV_LOWLEVEL, mixer, &dev_ops);
2400         if (err < 0)
2401                 goto _error;
2402 
2403         if (list_empty(&chip->mixer_list) &&
2404             !snd_card_proc_new(chip->card, "usbmixer", &entry))
2405                 snd_info_set_text_ops(entry, chip, snd_usb_mixer_proc_read);
2406 
2407         list_add(&mixer->list, &chip->mixer_list);
2408         return 0;
2409 
2410 _error:
2411         snd_usb_mixer_free(mixer);
2412         return err;
2413 }
2414 
2415 void snd_usb_mixer_disconnect(struct list_head *p)
2416 {
2417         struct usb_mixer_interface *mixer;
2418 
2419         mixer = list_entry(p, struct usb_mixer_interface, list);
2420         usb_kill_urb(mixer->urb);
2421         usb_kill_urb(mixer->rc_urb);
2422 }
2423 

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