~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.16 ] ~ [ linux-5.15.13 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.90 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.170 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.224 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.261 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.296 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.298 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ 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         case USB_ID(0x046d, 0x09a2): /* QuickCam Communicate Deluxe/S7500 */
897         /* Most audio usb devices lie about volume resolution.
898          * Most Logitech webcams have res = 384.
899          * Probably there is some logitech magic behind this number --fishor
900          */
901                 if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
902                         snd_printk(KERN_INFO
903                                 "set resolution quirk: cval->res = 384\n");
904                         cval->res = 384;
905                 }
906                 break;
907 
908         }
909 }
910 
911 /*
912  * retrieve the minimum and maximum values for the specified control
913  */
914 static int get_min_max_with_quirks(struct usb_mixer_elem_info *cval,
915                                    int default_min, struct snd_kcontrol *kctl)
916 {
917         /* for failsafe */
918         cval->min = default_min;
919         cval->max = cval->min + 1;
920         cval->res = 1;
921         cval->dBmin = cval->dBmax = 0;
922 
923         if (cval->val_type == USB_MIXER_BOOLEAN ||
924             cval->val_type == USB_MIXER_INV_BOOLEAN) {
925                 cval->initialized = 1;
926         } else {
927                 int minchn = 0;
928                 if (cval->cmask) {
929                         int i;
930                         for (i = 0; i < MAX_CHANNELS; i++)
931                                 if (cval->cmask & (1 << i)) {
932                                         minchn = i + 1;
933                                         break;
934                                 }
935                 }
936                 if (get_ctl_value(cval, UAC_GET_MAX, (cval->control << 8) | minchn, &cval->max) < 0 ||
937                     get_ctl_value(cval, UAC_GET_MIN, (cval->control << 8) | minchn, &cval->min) < 0) {
938                         snd_printd(KERN_ERR "%d:%d: cannot get min/max values for control %d (id %d)\n",
939                                    cval->id, snd_usb_ctrl_intf(cval->mixer->chip), cval->control, cval->id);
940                         return -EINVAL;
941                 }
942                 if (get_ctl_value(cval, UAC_GET_RES, (cval->control << 8) | minchn, &cval->res) < 0) {
943                         cval->res = 1;
944                 } else {
945                         int last_valid_res = cval->res;
946 
947                         while (cval->res > 1) {
948                                 if (snd_usb_mixer_set_ctl_value(cval, UAC_SET_RES,
949                                                                 (cval->control << 8) | minchn, cval->res / 2) < 0)
950                                         break;
951                                 cval->res /= 2;
952                         }
953                         if (get_ctl_value(cval, UAC_GET_RES, (cval->control << 8) | minchn, &cval->res) < 0)
954                                 cval->res = last_valid_res;
955                 }
956                 if (cval->res == 0)
957                         cval->res = 1;
958 
959                 /* Additional checks for the proper resolution
960                  *
961                  * Some devices report smaller resolutions than actually
962                  * reacting.  They don't return errors but simply clip
963                  * to the lower aligned value.
964                  */
965                 if (cval->min + cval->res < cval->max) {
966                         int last_valid_res = cval->res;
967                         int saved, test, check;
968                         get_cur_mix_raw(cval, minchn, &saved);
969                         for (;;) {
970                                 test = saved;
971                                 if (test < cval->max)
972                                         test += cval->res;
973                                 else
974                                         test -= cval->res;
975                                 if (test < cval->min || test > cval->max ||
976                                     set_cur_mix_value(cval, minchn, 0, test) ||
977                                     get_cur_mix_raw(cval, minchn, &check)) {
978                                         cval->res = last_valid_res;
979                                         break;
980                                 }
981                                 if (test == check)
982                                         break;
983                                 cval->res *= 2;
984                         }
985                         set_cur_mix_value(cval, minchn, 0, saved);
986                 }
987 
988                 cval->initialized = 1;
989         }
990 
991         if (kctl)
992                 volume_control_quirks(cval, kctl);
993 
994         /* USB descriptions contain the dB scale in 1/256 dB unit
995          * while ALSA TLV contains in 1/100 dB unit
996          */
997         cval->dBmin = (convert_signed_value(cval, cval->min) * 100) / 256;
998         cval->dBmax = (convert_signed_value(cval, cval->max) * 100) / 256;
999         if (cval->dBmin > cval->dBmax) {
1000                 /* something is wrong; assume it's either from/to 0dB */
1001                 if (cval->dBmin < 0)
1002                         cval->dBmax = 0;
1003                 else if (cval->dBmin > 0)
1004                         cval->dBmin = 0;
1005                 if (cval->dBmin > cval->dBmax) {
1006                         /* totally crap, return an error */
1007                         return -EINVAL;
1008                 }
1009         }
1010 
1011         return 0;
1012 }
1013 
1014 #define get_min_max(cval, def)  get_min_max_with_quirks(cval, def, NULL)
1015 
1016 /* get a feature/mixer unit info */
1017 static int mixer_ctl_feature_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
1018 {
1019         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1020 
1021         if (cval->val_type == USB_MIXER_BOOLEAN ||
1022             cval->val_type == USB_MIXER_INV_BOOLEAN)
1023                 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1024         else
1025                 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
1026         uinfo->count = cval->channels;
1027         if (cval->val_type == USB_MIXER_BOOLEAN ||
1028             cval->val_type == USB_MIXER_INV_BOOLEAN) {
1029                 uinfo->value.integer.min = 0;
1030                 uinfo->value.integer.max = 1;
1031         } else {
1032                 if (!cval->initialized) {
1033                         get_min_max_with_quirks(cval, 0, kcontrol);
1034                         if (cval->initialized && cval->dBmin >= cval->dBmax) {
1035                                 kcontrol->vd[0].access &= 
1036                                         ~(SNDRV_CTL_ELEM_ACCESS_TLV_READ |
1037                                           SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK);
1038                                 snd_ctl_notify(cval->mixer->chip->card,
1039                                                SNDRV_CTL_EVENT_MASK_INFO,
1040                                                &kcontrol->id);
1041                         }
1042                 }
1043                 uinfo->value.integer.min = 0;
1044                 uinfo->value.integer.max =
1045                         (cval->max - cval->min + cval->res - 1) / cval->res;
1046         }
1047         return 0;
1048 }
1049 
1050 /* get the current value from feature/mixer unit */
1051 static int mixer_ctl_feature_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1052 {
1053         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1054         int c, cnt, val, err;
1055 
1056         ucontrol->value.integer.value[0] = cval->min;
1057         if (cval->cmask) {
1058                 cnt = 0;
1059                 for (c = 0; c < MAX_CHANNELS; c++) {
1060                         if (!(cval->cmask & (1 << c)))
1061                                 continue;
1062                         err = get_cur_mix_value(cval, c + 1, cnt, &val);
1063                         if (err < 0)
1064                                 return cval->mixer->ignore_ctl_error ? 0 : err;
1065                         val = get_relative_value(cval, val);
1066                         ucontrol->value.integer.value[cnt] = val;
1067                         cnt++;
1068                 }
1069                 return 0;
1070         } else {
1071                 /* master channel */
1072                 err = get_cur_mix_value(cval, 0, 0, &val);
1073                 if (err < 0)
1074                         return cval->mixer->ignore_ctl_error ? 0 : err;
1075                 val = get_relative_value(cval, val);
1076                 ucontrol->value.integer.value[0] = val;
1077         }
1078         return 0;
1079 }
1080 
1081 /* put the current value to feature/mixer unit */
1082 static int mixer_ctl_feature_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1083 {
1084         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1085         int c, cnt, val, oval, err;
1086         int changed = 0;
1087 
1088         if (cval->cmask) {
1089                 cnt = 0;
1090                 for (c = 0; c < MAX_CHANNELS; c++) {
1091                         if (!(cval->cmask & (1 << c)))
1092                                 continue;
1093                         err = get_cur_mix_value(cval, c + 1, cnt, &oval);
1094                         if (err < 0)
1095                                 return cval->mixer->ignore_ctl_error ? 0 : err;
1096                         val = ucontrol->value.integer.value[cnt];
1097                         val = get_abs_value(cval, val);
1098                         if (oval != val) {
1099                                 set_cur_mix_value(cval, c + 1, cnt, val);
1100                                 changed = 1;
1101                         }
1102                         cnt++;
1103                 }
1104         } else {
1105                 /* master channel */
1106                 err = get_cur_mix_value(cval, 0, 0, &oval);
1107                 if (err < 0)
1108                         return cval->mixer->ignore_ctl_error ? 0 : err;
1109                 val = ucontrol->value.integer.value[0];
1110                 val = get_abs_value(cval, val);
1111                 if (val != oval) {
1112                         set_cur_mix_value(cval, 0, 0, val);
1113                         changed = 1;
1114                 }
1115         }
1116         return changed;
1117 }
1118 
1119 static struct snd_kcontrol_new usb_feature_unit_ctl = {
1120         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1121         .name = "", /* will be filled later manually */
1122         .info = mixer_ctl_feature_info,
1123         .get = mixer_ctl_feature_get,
1124         .put = mixer_ctl_feature_put,
1125 };
1126 
1127 /* the read-only variant */
1128 static struct snd_kcontrol_new usb_feature_unit_ctl_ro = {
1129         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1130         .name = "", /* will be filled later manually */
1131         .info = mixer_ctl_feature_info,
1132         .get = mixer_ctl_feature_get,
1133         .put = NULL,
1134 };
1135 
1136 /* This symbol is exported in order to allow the mixer quirks to
1137  * hook up to the standard feature unit control mechanism */
1138 struct snd_kcontrol_new *snd_usb_feature_unit_ctl = &usb_feature_unit_ctl;
1139 
1140 /*
1141  * build a feature control
1142  */
1143 
1144 static size_t append_ctl_name(struct snd_kcontrol *kctl, const char *str)
1145 {
1146         return strlcat(kctl->id.name, str, sizeof(kctl->id.name));
1147 }
1148 
1149 /* A lot of headsets/headphones have a "Speaker" mixer. Make sure we
1150    rename it to "Headphone". We determine if something is a headphone
1151    similar to how udev determines form factor. */
1152 static void check_no_speaker_on_headset(struct snd_kcontrol *kctl,
1153                                         struct snd_card *card)
1154 {
1155         const char *names_to_check[] = {
1156                 "Headset", "headset", "Headphone", "headphone", NULL};
1157         const char **s;
1158         bool found = 0;
1159 
1160         if (strcmp("Speaker", kctl->id.name))
1161                 return;
1162 
1163         for (s = names_to_check; *s; s++)
1164                 if (strstr(card->shortname, *s)) {
1165                         found = 1;
1166                         break;
1167                 }
1168 
1169         if (!found)
1170                 return;
1171 
1172         strlcpy(kctl->id.name, "Headphone", sizeof(kctl->id.name));
1173 }
1174 
1175 static void build_feature_ctl(struct mixer_build *state, void *raw_desc,
1176                               unsigned int ctl_mask, int control,
1177                               struct usb_audio_term *iterm, int unitid,
1178                               int readonly_mask)
1179 {
1180         struct uac_feature_unit_descriptor *desc = raw_desc;
1181         unsigned int len = 0;
1182         int mapped_name = 0;
1183         int nameid = uac_feature_unit_iFeature(desc);
1184         struct snd_kcontrol *kctl;
1185         struct usb_mixer_elem_info *cval;
1186         const struct usbmix_name_map *map;
1187         unsigned int range;
1188 
1189         control++; /* change from zero-based to 1-based value */
1190 
1191         if (control == UAC_FU_GRAPHIC_EQUALIZER) {
1192                 /* FIXME: not supported yet */
1193                 return;
1194         }
1195 
1196         map = find_map(state, unitid, control);
1197         if (check_ignored_ctl(map))
1198                 return;
1199 
1200         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1201         if (! cval) {
1202                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1203                 return;
1204         }
1205         cval->mixer = state->mixer;
1206         cval->id = unitid;
1207         cval->control = control;
1208         cval->cmask = ctl_mask;
1209         cval->val_type = audio_feature_info[control-1].type;
1210         if (ctl_mask == 0) {
1211                 cval->channels = 1;     /* master channel */
1212                 cval->master_readonly = readonly_mask;
1213         } else {
1214                 int i, c = 0;
1215                 for (i = 0; i < 16; i++)
1216                         if (ctl_mask & (1 << i))
1217                                 c++;
1218                 cval->channels = c;
1219                 cval->ch_readonly = readonly_mask;
1220         }
1221 
1222         /* if all channels in the mask are marked read-only, make the control
1223          * read-only. set_cur_mix_value() will check the mask again and won't
1224          * issue write commands to read-only channels. */
1225         if (cval->channels == readonly_mask)
1226                 kctl = snd_ctl_new1(&usb_feature_unit_ctl_ro, cval);
1227         else
1228                 kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
1229 
1230         if (! kctl) {
1231                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1232                 kfree(cval);
1233                 return;
1234         }
1235         kctl->private_free = usb_mixer_elem_free;
1236 
1237         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
1238         mapped_name = len != 0;
1239         if (! len && nameid)
1240                 len = snd_usb_copy_string_desc(state, nameid,
1241                                 kctl->id.name, sizeof(kctl->id.name));
1242 
1243         switch (control) {
1244         case UAC_FU_MUTE:
1245         case UAC_FU_VOLUME:
1246                 /* determine the control name.  the rule is:
1247                  * - if a name id is given in descriptor, use it.
1248                  * - if the connected input can be determined, then use the name
1249                  *   of terminal type.
1250                  * - if the connected output can be determined, use it.
1251                  * - otherwise, anonymous name.
1252                  */
1253                 if (! len) {
1254                         len = get_term_name(state, iterm, kctl->id.name, sizeof(kctl->id.name), 1);
1255                         if (! len)
1256                                 len = get_term_name(state, &state->oterm, kctl->id.name, sizeof(kctl->id.name), 1);
1257                         if (! len)
1258                                 len = snprintf(kctl->id.name, sizeof(kctl->id.name),
1259                                                "Feature %d", unitid);
1260                 }
1261 
1262                 if (!mapped_name)
1263                         check_no_speaker_on_headset(kctl, state->mixer->chip->card);
1264 
1265                 /* determine the stream direction:
1266                  * if the connected output is USB stream, then it's likely a
1267                  * capture stream.  otherwise it should be playback (hopefully :)
1268                  */
1269                 if (! mapped_name && ! (state->oterm.type >> 16)) {
1270                         if ((state->oterm.type & 0xff00) == 0x0100) {
1271                                 len = append_ctl_name(kctl, " Capture");
1272                         } else {
1273                                 len = append_ctl_name(kctl, " Playback");
1274                         }
1275                 }
1276                 append_ctl_name(kctl, control == UAC_FU_MUTE ?
1277                                 " Switch" : " Volume");
1278                 break;
1279         default:
1280                 if (! len)
1281                         strlcpy(kctl->id.name, audio_feature_info[control-1].name,
1282                                 sizeof(kctl->id.name));
1283                 break;
1284         }
1285 
1286         /* get min/max values */
1287         get_min_max_with_quirks(cval, 0, kctl);
1288 
1289         if (control == UAC_FU_VOLUME) {
1290                 check_mapped_dB(map, cval);
1291                 if (cval->dBmin < cval->dBmax || !cval->initialized) {
1292                         kctl->tlv.c = snd_usb_mixer_vol_tlv;
1293                         kctl->vd[0].access |=
1294                                 SNDRV_CTL_ELEM_ACCESS_TLV_READ |
1295                                 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
1296                 }
1297         }
1298 
1299         range = (cval->max - cval->min) / cval->res;
1300         /* Are there devices with volume range more than 255? I use a bit more
1301          * to be sure. 384 is a resolution magic number found on Logitech
1302          * devices. It will definitively catch all buggy Logitech devices.
1303          */
1304         if (range > 384) {
1305                 snd_printk(KERN_WARNING "usb_audio: Warning! Unlikely big "
1306                            "volume range (=%u), cval->res is probably wrong.",
1307                            range);
1308                 snd_printk(KERN_WARNING "usb_audio: [%d] FU [%s] ch = %d, "
1309                            "val = %d/%d/%d", cval->id,
1310                            kctl->id.name, cval->channels,
1311                            cval->min, cval->max, cval->res);
1312         }
1313 
1314         snd_printdd(KERN_INFO "[%d] FU [%s] ch = %d, val = %d/%d/%d\n",
1315                     cval->id, kctl->id.name, cval->channels, cval->min, cval->max, cval->res);
1316         snd_usb_mixer_add_control(state->mixer, kctl);
1317 }
1318 
1319 
1320 
1321 /*
1322  * parse a feature unit
1323  *
1324  * most of controls are defined here.
1325  */
1326 static int parse_audio_feature_unit(struct mixer_build *state, int unitid, void *_ftr)
1327 {
1328         int channels, i, j;
1329         struct usb_audio_term iterm;
1330         unsigned int master_bits, first_ch_bits;
1331         int err, csize;
1332         struct uac_feature_unit_descriptor *hdr = _ftr;
1333         __u8 *bmaControls;
1334 
1335         if (state->mixer->protocol == UAC_VERSION_1) {
1336                 csize = hdr->bControlSize;
1337                 if (!csize) {
1338                         snd_printdd(KERN_ERR "usbaudio: unit %u: "
1339                                     "invalid bControlSize == 0\n", unitid);
1340                         return -EINVAL;
1341                 }
1342                 channels = (hdr->bLength - 7) / csize - 1;
1343                 bmaControls = hdr->bmaControls;
1344                 if (hdr->bLength < 7 + csize) {
1345                         snd_printk(KERN_ERR "usbaudio: unit %u: "
1346                                    "invalid UAC_FEATURE_UNIT descriptor\n",
1347                                    unitid);
1348                         return -EINVAL;
1349                 }
1350         } else {
1351                 struct uac2_feature_unit_descriptor *ftr = _ftr;
1352                 csize = 4;
1353                 channels = (hdr->bLength - 6) / 4 - 1;
1354                 bmaControls = ftr->bmaControls;
1355                 if (hdr->bLength < 6 + csize) {
1356                         snd_printk(KERN_ERR "usbaudio: unit %u: "
1357                                    "invalid UAC_FEATURE_UNIT descriptor\n",
1358                                    unitid);
1359                         return -EINVAL;
1360                 }
1361         }
1362 
1363         /* parse the source unit */
1364         if ((err = parse_audio_unit(state, hdr->bSourceID)) < 0)
1365                 return err;
1366 
1367         /* determine the input source type and name */
1368         err = check_input_term(state, hdr->bSourceID, &iterm);
1369         if (err < 0)
1370                 return err;
1371 
1372         master_bits = snd_usb_combine_bytes(bmaControls, csize);
1373         /* master configuration quirks */
1374         switch (state->chip->usb_id) {
1375         case USB_ID(0x08bb, 0x2702):
1376                 snd_printk(KERN_INFO
1377                            "usbmixer: master volume quirk for PCM2702 chip\n");
1378                 /* disable non-functional volume control */
1379                 master_bits &= ~UAC_CONTROL_BIT(UAC_FU_VOLUME);
1380                 break;
1381         case USB_ID(0x1130, 0xf211):
1382                 snd_printk(KERN_INFO
1383                            "usbmixer: volume control quirk for Tenx TP6911 Audio Headset\n");
1384                 /* disable non-functional volume control */
1385                 channels = 0;
1386                 break;
1387 
1388         }
1389         if (channels > 0)
1390                 first_ch_bits = snd_usb_combine_bytes(bmaControls + csize, csize);
1391         else
1392                 first_ch_bits = 0;
1393 
1394         if (state->mixer->protocol == UAC_VERSION_1) {
1395                 /* check all control types */
1396                 for (i = 0; i < 10; i++) {
1397                         unsigned int ch_bits = 0;
1398                         for (j = 0; j < channels; j++) {
1399                                 unsigned int mask = snd_usb_combine_bytes(bmaControls + csize * (j+1), csize);
1400                                 if (mask & (1 << i))
1401                                         ch_bits |= (1 << j);
1402                         }
1403                         /* audio class v1 controls are never read-only */
1404                         if (ch_bits & 1) /* the first channel must be set (for ease of programming) */
1405                                 build_feature_ctl(state, _ftr, ch_bits, i, &iterm, unitid, 0);
1406                         if (master_bits & (1 << i))
1407                                 build_feature_ctl(state, _ftr, 0, i, &iterm, unitid, 0);
1408                 }
1409         } else { /* UAC_VERSION_2 */
1410                 for (i = 0; i < ARRAY_SIZE(audio_feature_info); i++) {
1411                         unsigned int ch_bits = 0;
1412                         unsigned int ch_read_only = 0;
1413 
1414                         for (j = 0; j < channels; j++) {
1415                                 unsigned int mask = snd_usb_combine_bytes(bmaControls + csize * (j+1), csize);
1416                                 if (uac2_control_is_readable(mask, i)) {
1417                                         ch_bits |= (1 << j);
1418                                         if (!uac2_control_is_writeable(mask, i))
1419                                                 ch_read_only |= (1 << j);
1420                                 }
1421                         }
1422 
1423                         /* NOTE: build_feature_ctl() will mark the control read-only if all channels
1424                          * are marked read-only in the descriptors. Otherwise, the control will be
1425                          * reported as writeable, but the driver will not actually issue a write
1426                          * command for read-only channels */
1427                         if (ch_bits & 1) /* the first channel must be set (for ease of programming) */
1428                                 build_feature_ctl(state, _ftr, ch_bits, i, &iterm, unitid, ch_read_only);
1429                         if (uac2_control_is_readable(master_bits, i))
1430                                 build_feature_ctl(state, _ftr, 0, i, &iterm, unitid,
1431                                                   !uac2_control_is_writeable(master_bits, i));
1432                 }
1433         }
1434 
1435         return 0;
1436 }
1437 
1438 
1439 /*
1440  * Mixer Unit
1441  */
1442 
1443 /*
1444  * build a mixer unit control
1445  *
1446  * the callbacks are identical with feature unit.
1447  * input channel number (zero based) is given in control field instead.
1448  */
1449 
1450 static void build_mixer_unit_ctl(struct mixer_build *state,
1451                                  struct uac_mixer_unit_descriptor *desc,
1452                                  int in_pin, int in_ch, int unitid,
1453                                  struct usb_audio_term *iterm)
1454 {
1455         struct usb_mixer_elem_info *cval;
1456         unsigned int num_outs = uac_mixer_unit_bNrChannels(desc);
1457         unsigned int i, len;
1458         struct snd_kcontrol *kctl;
1459         const struct usbmix_name_map *map;
1460 
1461         map = find_map(state, unitid, 0);
1462         if (check_ignored_ctl(map))
1463                 return;
1464 
1465         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1466         if (! cval)
1467                 return;
1468 
1469         cval->mixer = state->mixer;
1470         cval->id = unitid;
1471         cval->control = in_ch + 1; /* based on 1 */
1472         cval->val_type = USB_MIXER_S16;
1473         for (i = 0; i < num_outs; i++) {
1474                 if (check_matrix_bitmap(uac_mixer_unit_bmControls(desc, state->mixer->protocol), in_ch, i, num_outs)) {
1475                         cval->cmask |= (1 << i);
1476                         cval->channels++;
1477                 }
1478         }
1479 
1480         /* get min/max values */
1481         get_min_max(cval, 0);
1482 
1483         kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
1484         if (! kctl) {
1485                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1486                 kfree(cval);
1487                 return;
1488         }
1489         kctl->private_free = usb_mixer_elem_free;
1490 
1491         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
1492         if (! len)
1493                 len = get_term_name(state, iterm, kctl->id.name, sizeof(kctl->id.name), 0);
1494         if (! len)
1495                 len = sprintf(kctl->id.name, "Mixer Source %d", in_ch + 1);
1496         append_ctl_name(kctl, " Volume");
1497 
1498         snd_printdd(KERN_INFO "[%d] MU [%s] ch = %d, val = %d/%d\n",
1499                     cval->id, kctl->id.name, cval->channels, cval->min, cval->max);
1500         snd_usb_mixer_add_control(state->mixer, kctl);
1501 }
1502 
1503 
1504 /*
1505  * parse a mixer unit
1506  */
1507 static int parse_audio_mixer_unit(struct mixer_build *state, int unitid, void *raw_desc)
1508 {
1509         struct uac_mixer_unit_descriptor *desc = raw_desc;
1510         struct usb_audio_term iterm;
1511         int input_pins, num_ins, num_outs;
1512         int pin, ich, err;
1513 
1514         if (desc->bLength < 11 || ! (input_pins = desc->bNrInPins) || ! (num_outs = uac_mixer_unit_bNrChannels(desc))) {
1515                 snd_printk(KERN_ERR "invalid MIXER UNIT descriptor %d\n", unitid);
1516                 return -EINVAL;
1517         }
1518         /* no bmControls field (e.g. Maya44) -> ignore */
1519         if (desc->bLength <= 10 + input_pins) {
1520                 snd_printdd(KERN_INFO "MU %d has no bmControls field\n", unitid);
1521                 return 0;
1522         }
1523 
1524         num_ins = 0;
1525         ich = 0;
1526         for (pin = 0; pin < input_pins; pin++) {
1527                 err = parse_audio_unit(state, desc->baSourceID[pin]);
1528                 if (err < 0)
1529                         continue;
1530                 err = check_input_term(state, desc->baSourceID[pin], &iterm);
1531                 if (err < 0)
1532                         return err;
1533                 num_ins += iterm.channels;
1534                 for (; ich < num_ins; ++ich) {
1535                         int och, ich_has_controls = 0;
1536 
1537                         for (och = 0; och < num_outs; ++och) {
1538                                 if (check_matrix_bitmap(uac_mixer_unit_bmControls(desc, state->mixer->protocol),
1539                                                         ich, och, num_outs)) {
1540                                         ich_has_controls = 1;
1541                                         break;
1542                                 }
1543                         }
1544                         if (ich_has_controls)
1545                                 build_mixer_unit_ctl(state, desc, pin, ich,
1546                                                      unitid, &iterm);
1547                 }
1548         }
1549         return 0;
1550 }
1551 
1552 
1553 /*
1554  * Processing Unit / Extension Unit
1555  */
1556 
1557 /* get callback for processing/extension unit */
1558 static int mixer_ctl_procunit_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1559 {
1560         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1561         int err, val;
1562 
1563         err = get_cur_ctl_value(cval, cval->control << 8, &val);
1564         if (err < 0 && cval->mixer->ignore_ctl_error) {
1565                 ucontrol->value.integer.value[0] = cval->min;
1566                 return 0;
1567         }
1568         if (err < 0)
1569                 return err;
1570         val = get_relative_value(cval, val);
1571         ucontrol->value.integer.value[0] = val;
1572         return 0;
1573 }
1574 
1575 /* put callback for processing/extension unit */
1576 static int mixer_ctl_procunit_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1577 {
1578         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1579         int val, oval, err;
1580 
1581         err = get_cur_ctl_value(cval, cval->control << 8, &oval);
1582         if (err < 0) {
1583                 if (cval->mixer->ignore_ctl_error)
1584                         return 0;
1585                 return err;
1586         }
1587         val = ucontrol->value.integer.value[0];
1588         val = get_abs_value(cval, val);
1589         if (val != oval) {
1590                 set_cur_ctl_value(cval, cval->control << 8, val);
1591                 return 1;
1592         }
1593         return 0;
1594 }
1595 
1596 /* alsa control interface for processing/extension unit */
1597 static struct snd_kcontrol_new mixer_procunit_ctl = {
1598         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1599         .name = "", /* will be filled later */
1600         .info = mixer_ctl_feature_info,
1601         .get = mixer_ctl_procunit_get,
1602         .put = mixer_ctl_procunit_put,
1603 };
1604 
1605 
1606 /*
1607  * predefined data for processing units
1608  */
1609 struct procunit_value_info {
1610         int control;
1611         char *suffix;
1612         int val_type;
1613         int min_value;
1614 };
1615 
1616 struct procunit_info {
1617         int type;
1618         char *name;
1619         struct procunit_value_info *values;
1620 };
1621 
1622 static struct procunit_value_info updown_proc_info[] = {
1623         { UAC_UD_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1624         { UAC_UD_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
1625         { 0 }
1626 };
1627 static struct procunit_value_info prologic_proc_info[] = {
1628         { UAC_DP_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1629         { UAC_DP_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
1630         { 0 }
1631 };
1632 static struct procunit_value_info threed_enh_proc_info[] = {
1633         { UAC_3D_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1634         { UAC_3D_SPACE, "Spaciousness", USB_MIXER_U8 },
1635         { 0 }
1636 };
1637 static struct procunit_value_info reverb_proc_info[] = {
1638         { UAC_REVERB_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1639         { UAC_REVERB_LEVEL, "Level", USB_MIXER_U8 },
1640         { UAC_REVERB_TIME, "Time", USB_MIXER_U16 },
1641         { UAC_REVERB_FEEDBACK, "Feedback", USB_MIXER_U8 },
1642         { 0 }
1643 };
1644 static struct procunit_value_info chorus_proc_info[] = {
1645         { UAC_CHORUS_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1646         { UAC_CHORUS_LEVEL, "Level", USB_MIXER_U8 },
1647         { UAC_CHORUS_RATE, "Rate", USB_MIXER_U16 },
1648         { UAC_CHORUS_DEPTH, "Depth", USB_MIXER_U16 },
1649         { 0 }
1650 };
1651 static struct procunit_value_info dcr_proc_info[] = {
1652         { UAC_DCR_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1653         { UAC_DCR_RATE, "Ratio", USB_MIXER_U16 },
1654         { UAC_DCR_MAXAMPL, "Max Amp", USB_MIXER_S16 },
1655         { UAC_DCR_THRESHOLD, "Threshold", USB_MIXER_S16 },
1656         { UAC_DCR_ATTACK_TIME, "Attack Time", USB_MIXER_U16 },
1657         { UAC_DCR_RELEASE_TIME, "Release Time", USB_MIXER_U16 },
1658         { 0 }
1659 };
1660 
1661 static struct procunit_info procunits[] = {
1662         { UAC_PROCESS_UP_DOWNMIX, "Up Down", updown_proc_info },
1663         { UAC_PROCESS_DOLBY_PROLOGIC, "Dolby Prologic", prologic_proc_info },
1664         { UAC_PROCESS_STEREO_EXTENDER, "3D Stereo Extender", threed_enh_proc_info },
1665         { UAC_PROCESS_REVERB, "Reverb", reverb_proc_info },
1666         { UAC_PROCESS_CHORUS, "Chorus", chorus_proc_info },
1667         { UAC_PROCESS_DYN_RANGE_COMP, "DCR", dcr_proc_info },
1668         { 0 },
1669 };
1670 /*
1671  * predefined data for extension units
1672  */
1673 static struct procunit_value_info clock_rate_xu_info[] = {
1674         { USB_XU_CLOCK_RATE_SELECTOR, "Selector", USB_MIXER_U8, 0 },
1675         { 0 }
1676 };
1677 static struct procunit_value_info clock_source_xu_info[] = {
1678         { USB_XU_CLOCK_SOURCE_SELECTOR, "External", USB_MIXER_BOOLEAN },
1679         { 0 }
1680 };
1681 static struct procunit_value_info spdif_format_xu_info[] = {
1682         { USB_XU_DIGITAL_FORMAT_SELECTOR, "SPDIF/AC3", USB_MIXER_BOOLEAN },
1683         { 0 }
1684 };
1685 static struct procunit_value_info soft_limit_xu_info[] = {
1686         { USB_XU_SOFT_LIMIT_SELECTOR, " ", USB_MIXER_BOOLEAN },
1687         { 0 }
1688 };
1689 static struct procunit_info extunits[] = {
1690         { USB_XU_CLOCK_RATE, "Clock rate", clock_rate_xu_info },
1691         { USB_XU_CLOCK_SOURCE, "DigitalIn CLK source", clock_source_xu_info },
1692         { USB_XU_DIGITAL_IO_STATUS, "DigitalOut format:", spdif_format_xu_info },
1693         { USB_XU_DEVICE_OPTIONS, "AnalogueIn Soft Limit", soft_limit_xu_info },
1694         { 0 }
1695 };
1696 /*
1697  * build a processing/extension unit
1698  */
1699 static int build_audio_procunit(struct mixer_build *state, int unitid, void *raw_desc, struct procunit_info *list, char *name)
1700 {
1701         struct uac_processing_unit_descriptor *desc = raw_desc;
1702         int num_ins = desc->bNrInPins;
1703         struct usb_mixer_elem_info *cval;
1704         struct snd_kcontrol *kctl;
1705         int i, err, nameid, type, len;
1706         struct procunit_info *info;
1707         struct procunit_value_info *valinfo;
1708         const struct usbmix_name_map *map;
1709         static struct procunit_value_info default_value_info[] = {
1710                 { 0x01, "Switch", USB_MIXER_BOOLEAN },
1711                 { 0 }
1712         };
1713         static struct procunit_info default_info = {
1714                 0, NULL, default_value_info
1715         };
1716 
1717         if (desc->bLength < 13 || desc->bLength < 13 + num_ins ||
1718             desc->bLength < num_ins + uac_processing_unit_bControlSize(desc, state->mixer->protocol)) {
1719                 snd_printk(KERN_ERR "invalid %s descriptor (id %d)\n", name, unitid);
1720                 return -EINVAL;
1721         }
1722 
1723         for (i = 0; i < num_ins; i++) {
1724                 if ((err = parse_audio_unit(state, desc->baSourceID[i])) < 0)
1725                         return err;
1726         }
1727 
1728         type = le16_to_cpu(desc->wProcessType);
1729         for (info = list; info && info->type; info++)
1730                 if (info->type == type)
1731                         break;
1732         if (! info || ! info->type)
1733                 info = &default_info;
1734 
1735         for (valinfo = info->values; valinfo->control; valinfo++) {
1736                 __u8 *controls = uac_processing_unit_bmControls(desc, state->mixer->protocol);
1737 
1738                 if (! (controls[valinfo->control / 8] & (1 << ((valinfo->control % 8) - 1))))
1739                         continue;
1740                 map = find_map(state, unitid, valinfo->control);
1741                 if (check_ignored_ctl(map))
1742                         continue;
1743                 cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1744                 if (! cval) {
1745                         snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1746                         return -ENOMEM;
1747                 }
1748                 cval->mixer = state->mixer;
1749                 cval->id = unitid;
1750                 cval->control = valinfo->control;
1751                 cval->val_type = valinfo->val_type;
1752                 cval->channels = 1;
1753 
1754                 /* get min/max values */
1755                 if (type == UAC_PROCESS_UP_DOWNMIX && cval->control == UAC_UD_MODE_SELECT) {
1756                         __u8 *control_spec = uac_processing_unit_specific(desc, state->mixer->protocol);
1757                         /* FIXME: hard-coded */
1758                         cval->min = 1;
1759                         cval->max = control_spec[0];
1760                         cval->res = 1;
1761                         cval->initialized = 1;
1762                 } else {
1763                         if (type == USB_XU_CLOCK_RATE) {
1764                                 /* E-Mu USB 0404/0202/TrackerPre/0204
1765                                  * samplerate control quirk
1766                                  */
1767                                 cval->min = 0;
1768                                 cval->max = 5;
1769                                 cval->res = 1;
1770                                 cval->initialized = 1;
1771                         } else
1772                                 get_min_max(cval, valinfo->min_value);
1773                 }
1774 
1775                 kctl = snd_ctl_new1(&mixer_procunit_ctl, cval);
1776                 if (! kctl) {
1777                         snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1778                         kfree(cval);
1779                         return -ENOMEM;
1780                 }
1781                 kctl->private_free = usb_mixer_elem_free;
1782 
1783                 if (check_mapped_name(map, kctl->id.name,
1784                                                 sizeof(kctl->id.name)))
1785                         /* nothing */ ;
1786                 else if (info->name)
1787                         strlcpy(kctl->id.name, info->name, sizeof(kctl->id.name));
1788                 else {
1789                         nameid = uac_processing_unit_iProcessing(desc, state->mixer->protocol);
1790                         len = 0;
1791                         if (nameid)
1792                                 len = snd_usb_copy_string_desc(state, nameid, kctl->id.name, sizeof(kctl->id.name));
1793                         if (! len)
1794                                 strlcpy(kctl->id.name, name, sizeof(kctl->id.name));
1795                 }
1796                 append_ctl_name(kctl, " ");
1797                 append_ctl_name(kctl, valinfo->suffix);
1798 
1799                 snd_printdd(KERN_INFO "[%d] PU [%s] ch = %d, val = %d/%d\n",
1800                             cval->id, kctl->id.name, cval->channels, cval->min, cval->max);
1801                 if ((err = snd_usb_mixer_add_control(state->mixer, kctl)) < 0)
1802                         return err;
1803         }
1804         return 0;
1805 }
1806 
1807 
1808 static int parse_audio_processing_unit(struct mixer_build *state, int unitid, void *raw_desc)
1809 {
1810         return build_audio_procunit(state, unitid, raw_desc, procunits, "Processing Unit");
1811 }
1812 
1813 static int parse_audio_extension_unit(struct mixer_build *state, int unitid, void *raw_desc)
1814 {
1815         /* Note that we parse extension units with processing unit descriptors.
1816          * That's ok as the layout is the same */
1817         return build_audio_procunit(state, unitid, raw_desc, extunits, "Extension Unit");
1818 }
1819 
1820 
1821 /*
1822  * Selector Unit
1823  */
1824 
1825 /* info callback for selector unit
1826  * use an enumerator type for routing
1827  */
1828 static int mixer_ctl_selector_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
1829 {
1830         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1831         const char **itemlist = (const char **)kcontrol->private_value;
1832 
1833         if (snd_BUG_ON(!itemlist))
1834                 return -EINVAL;
1835         return snd_ctl_enum_info(uinfo, 1, cval->max, itemlist);
1836 }
1837 
1838 /* get callback for selector unit */
1839 static int mixer_ctl_selector_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1840 {
1841         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1842         int val, err;
1843 
1844         err = get_cur_ctl_value(cval, cval->control << 8, &val);
1845         if (err < 0) {
1846                 if (cval->mixer->ignore_ctl_error) {
1847                         ucontrol->value.enumerated.item[0] = 0;
1848                         return 0;
1849                 }
1850                 return err;
1851         }
1852         val = get_relative_value(cval, val);
1853         ucontrol->value.enumerated.item[0] = val;
1854         return 0;
1855 }
1856 
1857 /* put callback for selector unit */
1858 static int mixer_ctl_selector_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1859 {
1860         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1861         int val, oval, err;
1862 
1863         err = get_cur_ctl_value(cval, cval->control << 8, &oval);
1864         if (err < 0) {
1865                 if (cval->mixer->ignore_ctl_error)
1866                         return 0;
1867                 return err;
1868         }
1869         val = ucontrol->value.enumerated.item[0];
1870         val = get_abs_value(cval, val);
1871         if (val != oval) {
1872                 set_cur_ctl_value(cval, cval->control << 8, val);
1873                 return 1;
1874         }
1875         return 0;
1876 }
1877 
1878 /* alsa control interface for selector unit */
1879 static struct snd_kcontrol_new mixer_selectunit_ctl = {
1880         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1881         .name = "", /* will be filled later */
1882         .info = mixer_ctl_selector_info,
1883         .get = mixer_ctl_selector_get,
1884         .put = mixer_ctl_selector_put,
1885 };
1886 
1887 
1888 /* private free callback.
1889  * free both private_data and private_value
1890  */
1891 static void usb_mixer_selector_elem_free(struct snd_kcontrol *kctl)
1892 {
1893         int i, num_ins = 0;
1894 
1895         if (kctl->private_data) {
1896                 struct usb_mixer_elem_info *cval = kctl->private_data;
1897                 num_ins = cval->max;
1898                 kfree(cval);
1899                 kctl->private_data = NULL;
1900         }
1901         if (kctl->private_value) {
1902                 char **itemlist = (char **)kctl->private_value;
1903                 for (i = 0; i < num_ins; i++)
1904                         kfree(itemlist[i]);
1905                 kfree(itemlist);
1906                 kctl->private_value = 0;
1907         }
1908 }
1909 
1910 /*
1911  * parse a selector unit
1912  */
1913 static int parse_audio_selector_unit(struct mixer_build *state, int unitid, void *raw_desc)
1914 {
1915         struct uac_selector_unit_descriptor *desc = raw_desc;
1916         unsigned int i, nameid, len;
1917         int err;
1918         struct usb_mixer_elem_info *cval;
1919         struct snd_kcontrol *kctl;
1920         const struct usbmix_name_map *map;
1921         char **namelist;
1922 
1923         if (!desc->bNrInPins || desc->bLength < 5 + desc->bNrInPins) {
1924                 snd_printk(KERN_ERR "invalid SELECTOR UNIT descriptor %d\n", unitid);
1925                 return -EINVAL;
1926         }
1927 
1928         for (i = 0; i < desc->bNrInPins; i++) {
1929                 if ((err = parse_audio_unit(state, desc->baSourceID[i])) < 0)
1930                         return err;
1931         }
1932 
1933         if (desc->bNrInPins == 1) /* only one ? nonsense! */
1934                 return 0;
1935 
1936         map = find_map(state, unitid, 0);
1937         if (check_ignored_ctl(map))
1938                 return 0;
1939 
1940         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1941         if (! cval) {
1942                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1943                 return -ENOMEM;
1944         }
1945         cval->mixer = state->mixer;
1946         cval->id = unitid;
1947         cval->val_type = USB_MIXER_U8;
1948         cval->channels = 1;
1949         cval->min = 1;
1950         cval->max = desc->bNrInPins;
1951         cval->res = 1;
1952         cval->initialized = 1;
1953 
1954         if (desc->bDescriptorSubtype == UAC2_CLOCK_SELECTOR)
1955                 cval->control = UAC2_CX_CLOCK_SELECTOR;
1956         else
1957                 cval->control = 0;
1958 
1959         namelist = kmalloc(sizeof(char *) * desc->bNrInPins, GFP_KERNEL);
1960         if (! namelist) {
1961                 snd_printk(KERN_ERR "cannot malloc\n");
1962                 kfree(cval);
1963                 return -ENOMEM;
1964         }
1965 #define MAX_ITEM_NAME_LEN       64
1966         for (i = 0; i < desc->bNrInPins; i++) {
1967                 struct usb_audio_term iterm;
1968                 len = 0;
1969                 namelist[i] = kmalloc(MAX_ITEM_NAME_LEN, GFP_KERNEL);
1970                 if (! namelist[i]) {
1971                         snd_printk(KERN_ERR "cannot malloc\n");
1972                         while (i--)
1973                                 kfree(namelist[i]);
1974                         kfree(namelist);
1975                         kfree(cval);
1976                         return -ENOMEM;
1977                 }
1978                 len = check_mapped_selector_name(state, unitid, i, namelist[i],
1979                                                  MAX_ITEM_NAME_LEN);
1980                 if (! len && check_input_term(state, desc->baSourceID[i], &iterm) >= 0)
1981                         len = get_term_name(state, &iterm, namelist[i], MAX_ITEM_NAME_LEN, 0);
1982                 if (! len)
1983                         sprintf(namelist[i], "Input %d", i);
1984         }
1985 
1986         kctl = snd_ctl_new1(&mixer_selectunit_ctl, cval);
1987         if (! kctl) {
1988                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1989                 kfree(namelist);
1990                 kfree(cval);
1991                 return -ENOMEM;
1992         }
1993         kctl->private_value = (unsigned long)namelist;
1994         kctl->private_free = usb_mixer_selector_elem_free;
1995 
1996         nameid = uac_selector_unit_iSelector(desc);
1997         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
1998         if (len)
1999                 ;
2000         else if (nameid)
2001                 snd_usb_copy_string_desc(state, nameid, kctl->id.name, sizeof(kctl->id.name));
2002         else {
2003                 len = get_term_name(state, &state->oterm,
2004                                     kctl->id.name, sizeof(kctl->id.name), 0);
2005                 if (! len)
2006                         strlcpy(kctl->id.name, "USB", sizeof(kctl->id.name));
2007 
2008                 if (desc->bDescriptorSubtype == UAC2_CLOCK_SELECTOR)
2009                         append_ctl_name(kctl, " Clock Source");
2010                 else if ((state->oterm.type & 0xff00) == 0x0100)
2011                         append_ctl_name(kctl, " Capture Source");
2012                 else
2013                         append_ctl_name(kctl, " Playback Source");
2014         }
2015 
2016         snd_printdd(KERN_INFO "[%d] SU [%s] items = %d\n",
2017                     cval->id, kctl->id.name, desc->bNrInPins);
2018         if ((err = snd_usb_mixer_add_control(state->mixer, kctl)) < 0)
2019                 return err;
2020 
2021         return 0;
2022 }
2023 
2024 
2025 /*
2026  * parse an audio unit recursively
2027  */
2028 
2029 static int parse_audio_unit(struct mixer_build *state, int unitid)
2030 {
2031         unsigned char *p1;
2032 
2033         if (test_and_set_bit(unitid, state->unitbitmap))
2034                 return 0; /* the unit already visited */
2035 
2036         p1 = find_audio_control_unit(state, unitid);
2037         if (!p1) {
2038                 snd_printk(KERN_ERR "usbaudio: unit %d not found!\n", unitid);
2039                 return -EINVAL;
2040         }
2041 
2042         switch (p1[2]) {
2043         case UAC_INPUT_TERMINAL:
2044         case UAC2_CLOCK_SOURCE:
2045                 return 0; /* NOP */
2046         case UAC_MIXER_UNIT:
2047                 return parse_audio_mixer_unit(state, unitid, p1);
2048         case UAC_SELECTOR_UNIT:
2049         case UAC2_CLOCK_SELECTOR:
2050                 return parse_audio_selector_unit(state, unitid, p1);
2051         case UAC_FEATURE_UNIT:
2052                 return parse_audio_feature_unit(state, unitid, p1);
2053         case UAC1_PROCESSING_UNIT:
2054         /*   UAC2_EFFECT_UNIT has the same value */
2055                 if (state->mixer->protocol == UAC_VERSION_1)
2056                         return parse_audio_processing_unit(state, unitid, p1);
2057                 else
2058                         return 0; /* FIXME - effect units not implemented yet */
2059         case UAC1_EXTENSION_UNIT:
2060         /*   UAC2_PROCESSING_UNIT_V2 has the same value */
2061                 if (state->mixer->protocol == UAC_VERSION_1)
2062                         return parse_audio_extension_unit(state, unitid, p1);
2063                 else /* UAC_VERSION_2 */
2064                         return parse_audio_processing_unit(state, unitid, p1);
2065         case UAC2_EXTENSION_UNIT_V2:
2066                 return parse_audio_extension_unit(state, unitid, p1);
2067         default:
2068                 snd_printk(KERN_ERR "usbaudio: unit %u: unexpected type 0x%02x\n", unitid, p1[2]);
2069                 return -EINVAL;
2070         }
2071 }
2072 
2073 static void snd_usb_mixer_free(struct usb_mixer_interface *mixer)
2074 {
2075         kfree(mixer->id_elems);
2076         if (mixer->urb) {
2077                 kfree(mixer->urb->transfer_buffer);
2078                 usb_free_urb(mixer->urb);
2079         }
2080         usb_free_urb(mixer->rc_urb);
2081         kfree(mixer->rc_setup_packet);
2082         kfree(mixer);
2083 }
2084 
2085 static int snd_usb_mixer_dev_free(struct snd_device *device)
2086 {
2087         struct usb_mixer_interface *mixer = device->device_data;
2088         snd_usb_mixer_free(mixer);
2089         return 0;
2090 }
2091 
2092 /*
2093  * create mixer controls
2094  *
2095  * walk through all UAC_OUTPUT_TERMINAL descriptors to search for mixers
2096  */
2097 static int snd_usb_mixer_controls(struct usb_mixer_interface *mixer)
2098 {
2099         struct mixer_build state;
2100         int err;
2101         const struct usbmix_ctl_map *map;
2102         void *p;
2103 
2104         memset(&state, 0, sizeof(state));
2105         state.chip = mixer->chip;
2106         state.mixer = mixer;
2107         state.buffer = mixer->hostif->extra;
2108         state.buflen = mixer->hostif->extralen;
2109 
2110         /* check the mapping table */
2111         for (map = usbmix_ctl_maps; map->id; map++) {
2112                 if (map->id == state.chip->usb_id) {
2113                         state.map = map->map;
2114                         state.selector_map = map->selector_map;
2115                         mixer->ignore_ctl_error = map->ignore_ctl_error;
2116                         break;
2117                 }
2118         }
2119 
2120         p = NULL;
2121         while ((p = snd_usb_find_csint_desc(mixer->hostif->extra, mixer->hostif->extralen,
2122                                             p, UAC_OUTPUT_TERMINAL)) != NULL) {
2123                 if (mixer->protocol == UAC_VERSION_1) {
2124                         struct uac1_output_terminal_descriptor *desc = p;
2125 
2126                         if (desc->bLength < sizeof(*desc))
2127                                 continue; /* invalid descriptor? */
2128                         set_bit(desc->bTerminalID, state.unitbitmap);  /* mark terminal ID as visited */
2129                         state.oterm.id = desc->bTerminalID;
2130                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
2131                         state.oterm.name = desc->iTerminal;
2132                         err = parse_audio_unit(&state, desc->bSourceID);
2133                         if (err < 0 && err != -EINVAL)
2134                                 return err;
2135                 } else { /* UAC_VERSION_2 */
2136                         struct uac2_output_terminal_descriptor *desc = p;
2137 
2138                         if (desc->bLength < sizeof(*desc))
2139                                 continue; /* invalid descriptor? */
2140                         set_bit(desc->bTerminalID, state.unitbitmap);  /* mark terminal ID as visited */
2141                         state.oterm.id = desc->bTerminalID;
2142                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
2143                         state.oterm.name = desc->iTerminal;
2144                         err = parse_audio_unit(&state, desc->bSourceID);
2145                         if (err < 0 && err != -EINVAL)
2146                                 return err;
2147 
2148                         /* for UAC2, use the same approach to also add the clock selectors */
2149                         err = parse_audio_unit(&state, desc->bCSourceID);
2150                         if (err < 0 && err != -EINVAL)
2151                                 return err;
2152                 }
2153         }
2154 
2155         return 0;
2156 }
2157 
2158 void snd_usb_mixer_notify_id(struct usb_mixer_interface *mixer, int unitid)
2159 {
2160         struct usb_mixer_elem_info *info;
2161 
2162         for (info = mixer->id_elems[unitid]; info; info = info->next_id_elem)
2163                 snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
2164                                info->elem_id);
2165 }
2166 
2167 static void snd_usb_mixer_dump_cval(struct snd_info_buffer *buffer,
2168                                     int unitid,
2169                                     struct usb_mixer_elem_info *cval)
2170 {
2171         static char *val_types[] = {"BOOLEAN", "INV_BOOLEAN",
2172                                     "S8", "U8", "S16", "U16"};
2173         snd_iprintf(buffer, "  Unit: %i\n", unitid);
2174         if (cval->elem_id)
2175                 snd_iprintf(buffer, "    Control: name=\"%s\", index=%i\n",
2176                                 cval->elem_id->name, cval->elem_id->index);
2177         snd_iprintf(buffer, "    Info: id=%i, control=%i, cmask=0x%x, "
2178                             "channels=%i, type=\"%s\"\n", cval->id,
2179                             cval->control, cval->cmask, cval->channels,
2180                             val_types[cval->val_type]);
2181         snd_iprintf(buffer, "    Volume: min=%i, max=%i, dBmin=%i, dBmax=%i\n",
2182                             cval->min, cval->max, cval->dBmin, cval->dBmax);
2183 }
2184 
2185 static void snd_usb_mixer_proc_read(struct snd_info_entry *entry,
2186                                     struct snd_info_buffer *buffer)
2187 {
2188         struct snd_usb_audio *chip = entry->private_data;
2189         struct usb_mixer_interface *mixer;
2190         struct usb_mixer_elem_info *cval;
2191         int unitid;
2192 
2193         list_for_each_entry(mixer, &chip->mixer_list, list) {
2194                 snd_iprintf(buffer,
2195                         "USB Mixer: usb_id=0x%08x, ctrlif=%i, ctlerr=%i\n",
2196                                 chip->usb_id, snd_usb_ctrl_intf(chip),
2197                                 mixer->ignore_ctl_error);
2198                 snd_iprintf(buffer, "Card: %s\n", chip->card->longname);
2199                 for (unitid = 0; unitid < MAX_ID_ELEMS; unitid++) {
2200                         for (cval = mixer->id_elems[unitid]; cval;
2201                                                 cval = cval->next_id_elem)
2202                                 snd_usb_mixer_dump_cval(buffer, unitid, cval);
2203                 }
2204         }
2205 }
2206 
2207 static void snd_usb_mixer_interrupt_v2(struct usb_mixer_interface *mixer,
2208                                        int attribute, int value, int index)
2209 {
2210         struct usb_mixer_elem_info *info;
2211         __u8 unitid = (index >> 8) & 0xff;
2212         __u8 control = (value >> 8) & 0xff;
2213         __u8 channel = value & 0xff;
2214 
2215         if (channel >= MAX_CHANNELS) {
2216                 snd_printk(KERN_DEBUG "%s(): bogus channel number %d\n",
2217                                 __func__, channel);
2218                 return;
2219         }
2220 
2221         for (info = mixer->id_elems[unitid]; info; info = info->next_id_elem) {
2222                 if (info->control != control)
2223                         continue;
2224 
2225                 switch (attribute) {
2226                 case UAC2_CS_CUR:
2227                         /* invalidate cache, so the value is read from the device */
2228                         if (channel)
2229                                 info->cached &= ~(1 << channel);
2230                         else /* master channel */
2231                                 info->cached = 0;
2232 
2233                         snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
2234                                         info->elem_id);
2235                         break;
2236 
2237                 case UAC2_CS_RANGE:
2238                         /* TODO */
2239                         break;
2240 
2241                 case UAC2_CS_MEM:
2242                         /* TODO */
2243                         break;
2244 
2245                 default:
2246                         snd_printk(KERN_DEBUG "unknown attribute %d in interrupt\n",
2247                                                 attribute);
2248                         break;
2249                 } /* switch */
2250         }
2251 }
2252 
2253 static void snd_usb_mixer_interrupt(struct urb *urb)
2254 {
2255         struct usb_mixer_interface *mixer = urb->context;
2256         int len = urb->actual_length;
2257         int ustatus = urb->status;
2258 
2259         if (ustatus != 0)
2260                 goto requeue;
2261 
2262         if (mixer->protocol == UAC_VERSION_1) {
2263                 struct uac1_status_word *status;
2264 
2265                 for (status = urb->transfer_buffer;
2266                      len >= sizeof(*status);
2267                      len -= sizeof(*status), status++) {
2268                         snd_printd(KERN_DEBUG "status interrupt: %02x %02x\n",
2269                                                 status->bStatusType,
2270                                                 status->bOriginator);
2271 
2272                         /* ignore any notifications not from the control interface */
2273                         if ((status->bStatusType & UAC1_STATUS_TYPE_ORIG_MASK) !=
2274                                 UAC1_STATUS_TYPE_ORIG_AUDIO_CONTROL_IF)
2275                                 continue;
2276 
2277                         if (status->bStatusType & UAC1_STATUS_TYPE_MEM_CHANGED)
2278                                 snd_usb_mixer_rc_memory_change(mixer, status->bOriginator);
2279                         else
2280                                 snd_usb_mixer_notify_id(mixer, status->bOriginator);
2281                 }
2282         } else { /* UAC_VERSION_2 */
2283                 struct uac2_interrupt_data_msg *msg;
2284 
2285                 for (msg = urb->transfer_buffer;
2286                      len >= sizeof(*msg);
2287                      len -= sizeof(*msg), msg++) {
2288                         /* drop vendor specific and endpoint requests */
2289                         if ((msg->bInfo & UAC2_INTERRUPT_DATA_MSG_VENDOR) ||
2290                             (msg->bInfo & UAC2_INTERRUPT_DATA_MSG_EP))
2291                                 continue;
2292 
2293                         snd_usb_mixer_interrupt_v2(mixer, msg->bAttribute,
2294                                                    le16_to_cpu(msg->wValue),
2295                                                    le16_to_cpu(msg->wIndex));
2296                 }
2297         }
2298 
2299 requeue:
2300         if (ustatus != -ENOENT && ustatus != -ECONNRESET && ustatus != -ESHUTDOWN) {
2301                 urb->dev = mixer->chip->dev;
2302                 usb_submit_urb(urb, GFP_ATOMIC);
2303         }
2304 }
2305 
2306 /* create the handler for the optional status interrupt endpoint */
2307 static int snd_usb_mixer_status_create(struct usb_mixer_interface *mixer)
2308 {
2309         struct usb_endpoint_descriptor *ep;
2310         void *transfer_buffer;
2311         int buffer_length;
2312         unsigned int epnum;
2313 
2314         /* we need one interrupt input endpoint */
2315         if (get_iface_desc(mixer->hostif)->bNumEndpoints < 1)
2316                 return 0;
2317         ep = get_endpoint(mixer->hostif, 0);
2318         if (!usb_endpoint_dir_in(ep) || !usb_endpoint_xfer_int(ep))
2319                 return 0;
2320 
2321         epnum = usb_endpoint_num(ep);
2322         buffer_length = le16_to_cpu(ep->wMaxPacketSize);
2323         transfer_buffer = kmalloc(buffer_length, GFP_KERNEL);
2324         if (!transfer_buffer)
2325                 return -ENOMEM;
2326         mixer->urb = usb_alloc_urb(0, GFP_KERNEL);
2327         if (!mixer->urb) {
2328                 kfree(transfer_buffer);
2329                 return -ENOMEM;
2330         }
2331         usb_fill_int_urb(mixer->urb, mixer->chip->dev,
2332                          usb_rcvintpipe(mixer->chip->dev, epnum),
2333                          transfer_buffer, buffer_length,
2334                          snd_usb_mixer_interrupt, mixer, ep->bInterval);
2335         usb_submit_urb(mixer->urb, GFP_KERNEL);
2336         return 0;
2337 }
2338 
2339 int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif,
2340                          int ignore_error)
2341 {
2342         static struct snd_device_ops dev_ops = {
2343                 .dev_free = snd_usb_mixer_dev_free
2344         };
2345         struct usb_mixer_interface *mixer;
2346         struct snd_info_entry *entry;
2347         int err;
2348 
2349         strcpy(chip->card->mixername, "USB Mixer");
2350 
2351         mixer = kzalloc(sizeof(*mixer), GFP_KERNEL);
2352         if (!mixer)
2353                 return -ENOMEM;
2354         mixer->chip = chip;
2355         mixer->ignore_ctl_error = ignore_error;
2356         mixer->id_elems = kcalloc(MAX_ID_ELEMS, sizeof(*mixer->id_elems),
2357                                   GFP_KERNEL);
2358         if (!mixer->id_elems) {
2359                 kfree(mixer);
2360                 return -ENOMEM;
2361         }
2362 
2363         mixer->hostif = &usb_ifnum_to_if(chip->dev, ctrlif)->altsetting[0];
2364         switch (get_iface_desc(mixer->hostif)->bInterfaceProtocol) {
2365         case UAC_VERSION_1:
2366         default:
2367                 mixer->protocol = UAC_VERSION_1;
2368                 break;
2369         case UAC_VERSION_2:
2370                 mixer->protocol = UAC_VERSION_2;
2371                 break;
2372         }
2373 
2374         if ((err = snd_usb_mixer_controls(mixer)) < 0 ||
2375             (err = snd_usb_mixer_status_create(mixer)) < 0)
2376                 goto _error;
2377 
2378         snd_usb_mixer_apply_create_quirk(mixer);
2379 
2380         err = snd_device_new(chip->card, SNDRV_DEV_LOWLEVEL, mixer, &dev_ops);
2381         if (err < 0)
2382                 goto _error;
2383 
2384         if (list_empty(&chip->mixer_list) &&
2385             !snd_card_proc_new(chip->card, "usbmixer", &entry))
2386                 snd_info_set_text_ops(entry, chip, snd_usb_mixer_proc_read);
2387 
2388         list_add(&mixer->list, &chip->mixer_list);
2389         return 0;
2390 
2391 _error:
2392         snd_usb_mixer_free(mixer);
2393         return err;
2394 }
2395 
2396 void snd_usb_mixer_disconnect(struct list_head *p)
2397 {
2398         struct usb_mixer_interface *mixer;
2399 
2400         mixer = list_entry(p, struct usb_mixer_interface, list);
2401         usb_kill_urb(mixer->urb);
2402         usb_kill_urb(mixer->rc_urb);
2403 }
2404 
2405 #ifdef CONFIG_PM
2406 /* stop any bus activity of a mixer */
2407 static void snd_usb_mixer_inactivate(struct usb_mixer_interface *mixer)
2408 {
2409         usb_kill_urb(mixer->urb);
2410         usb_kill_urb(mixer->rc_urb);
2411 }
2412 
2413 static int snd_usb_mixer_activate(struct usb_mixer_interface *mixer)
2414 {
2415         int err;
2416 
2417         if (mixer->urb) {
2418                 err = usb_submit_urb(mixer->urb, GFP_NOIO);
2419                 if (err < 0)
2420                         return err;
2421         }
2422 
2423         return 0;
2424 }
2425 
2426 int snd_usb_mixer_suspend(struct usb_mixer_interface *mixer)
2427 {
2428         snd_usb_mixer_inactivate(mixer);
2429         return 0;
2430 }
2431 
2432 static int restore_mixer_value(struct usb_mixer_elem_info *cval)
2433 {
2434         int c, err, idx;
2435 
2436         if (cval->cmask) {
2437                 idx = 0;
2438                 for (c = 0; c < MAX_CHANNELS; c++) {
2439                         if (!(cval->cmask & (1 << c)))
2440                                 continue;
2441                         if (cval->cached & (1 << c)) {
2442                                 err = set_cur_mix_value(cval, c + 1, idx,
2443                                                         cval->cache_val[idx]);
2444                                 if (err < 0)
2445                                         return err;
2446                         }
2447                         idx++;
2448                 }
2449         } else {
2450                 /* master */
2451                 if (cval->cached) {
2452                         err = set_cur_mix_value(cval, 0, 0, *cval->cache_val);
2453                         if (err < 0)
2454                                 return err;
2455                 }
2456         }
2457 
2458         return 0;
2459 }
2460 
2461 int snd_usb_mixer_resume(struct usb_mixer_interface *mixer, bool reset_resume)
2462 {
2463         struct usb_mixer_elem_info *cval;
2464         int id, err;
2465 
2466         /* FIXME: any mixer quirks? */
2467 
2468         if (reset_resume) {
2469                 /* restore cached mixer values */
2470                 for (id = 0; id < MAX_ID_ELEMS; id++) {
2471                         for (cval = mixer->id_elems[id]; cval;
2472                              cval = cval->next_id_elem) {
2473                                 err = restore_mixer_value(cval);
2474                                 if (err < 0)
2475                                         return err;
2476                         }
2477                 }
2478         }
2479 
2480         return snd_usb_mixer_activate(mixer);
2481 }
2482 #endif
2483 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp