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

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  1 /*
  2  *   (Tentative) USB Audio Driver for ALSA
  3  *
  4  *   Mixer control part
  5  *
  6  *   Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
  7  *
  8  *   Many codes borrowed from audio.c by
  9  *          Alan Cox (alan@lxorguk.ukuu.org.uk)
 10  *          Thomas Sailer (sailer@ife.ee.ethz.ch)
 11  *
 12  *
 13  *   This program is free software; you can redistribute it and/or modify
 14  *   it under the terms of the GNU General Public License as published by
 15  *   the Free Software Foundation; either version 2 of the License, or
 16  *   (at your option) any later version.
 17  *
 18  *   This program is distributed in the hope that it will be useful,
 19  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 20  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 21  *   GNU General Public License for more details.
 22  *
 23  *   You should have received a copy of the GNU General Public License
 24  *   along with this program; if not, write to the Free Software
 25  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 26  *
 27  */
 28 
 29 /*
 30  * TODOs, for both the mixer and the streaming interfaces:
 31  *
 32  *  - support for UAC2 effect units
 33  *  - support for graphical equalizers
 34  *  - RANGE and MEM set commands (UAC2)
 35  *  - RANGE and MEM interrupt dispatchers (UAC2)
 36  *  - audio channel clustering (UAC2)
 37  *  - audio sample rate converter units (UAC2)
 38  *  - proper handling of clock multipliers (UAC2)
 39  *  - dispatch clock change notifications (UAC2)
 40  *      - stop PCM streams which use a clock that became invalid
 41  *      - stop PCM streams which use a clock selector that has changed
 42  *      - parse available sample rates again when clock sources changed
 43  */
 44 
 45 #include <linux/bitops.h>
 46 #include <linux/init.h>
 47 #include <linux/list.h>
 48 #include <linux/slab.h>
 49 #include <linux/string.h>
 50 #include <linux/usb.h>
 51 #include <linux/usb/audio.h>
 52 #include <linux/usb/audio-v2.h>
 53 
 54 #include <sound/core.h>
 55 #include <sound/control.h>
 56 #include <sound/hwdep.h>
 57 #include <sound/info.h>
 58 #include <sound/tlv.h>
 59 
 60 #include "usbaudio.h"
 61 #include "mixer.h"
 62 #include "helper.h"
 63 #include "mixer_quirks.h"
 64 #include "power.h"
 65 
 66 #define MAX_ID_ELEMS    256
 67 
 68 struct usb_audio_term {
 69         int id;
 70         int type;
 71         int channels;
 72         unsigned int chconfig;
 73         int name;
 74 };
 75 
 76 struct usbmix_name_map;
 77 
 78 struct mixer_build {
 79         struct snd_usb_audio *chip;
 80         struct usb_mixer_interface *mixer;
 81         unsigned char *buffer;
 82         unsigned int buflen;
 83         DECLARE_BITMAP(unitbitmap, MAX_ID_ELEMS);
 84         struct usb_audio_term oterm;
 85         const struct usbmix_name_map *map;
 86         const struct usbmix_selector_map *selector_map;
 87 };
 88 
 89 /*E-mu 0202/0404/0204 eXtension Unit(XU) control*/
 90 enum {
 91         USB_XU_CLOCK_RATE               = 0xe301,
 92         USB_XU_CLOCK_SOURCE             = 0xe302,
 93         USB_XU_DIGITAL_IO_STATUS        = 0xe303,
 94         USB_XU_DEVICE_OPTIONS           = 0xe304,
 95         USB_XU_DIRECT_MONITORING        = 0xe305,
 96         USB_XU_METERING                 = 0xe306
 97 };
 98 enum {
 99         USB_XU_CLOCK_SOURCE_SELECTOR = 0x02,    /* clock source*/
100         USB_XU_CLOCK_RATE_SELECTOR = 0x03,      /* clock rate */
101         USB_XU_DIGITAL_FORMAT_SELECTOR = 0x01,  /* the spdif format */
102         USB_XU_SOFT_LIMIT_SELECTOR = 0x03       /* soft limiter */
103 };
104 
105 /*
106  * manual mapping of mixer names
107  * if the mixer topology is too complicated and the parsed names are
108  * ambiguous, add the entries in usbmixer_maps.c.
109  */
110 #include "mixer_maps.c"
111 
112 static const struct usbmix_name_map *
113 find_map(struct mixer_build *state, int unitid, int control)
114 {
115         const struct usbmix_name_map *p = state->map;
116 
117         if (!p)
118                 return NULL;
119 
120         for (p = state->map; p->id; p++) {
121                 if (p->id == unitid &&
122                     (!control || !p->control || control == p->control))
123                         return p;
124         }
125         return NULL;
126 }
127 
128 /* get the mapped name if the unit matches */
129 static int
130 check_mapped_name(const struct usbmix_name_map *p, char *buf, int buflen)
131 {
132         if (!p || !p->name)
133                 return 0;
134 
135         buflen--;
136         return strlcpy(buf, p->name, buflen);
137 }
138 
139 /* check whether the control should be ignored */
140 static inline int
141 check_ignored_ctl(const struct usbmix_name_map *p)
142 {
143         if (!p || p->name || p->dB)
144                 return 0;
145         return 1;
146 }
147 
148 /* dB mapping */
149 static inline void check_mapped_dB(const struct usbmix_name_map *p,
150                                    struct usb_mixer_elem_info *cval)
151 {
152         if (p && p->dB) {
153                 cval->dBmin = p->dB->min;
154                 cval->dBmax = p->dB->max;
155                 cval->initialized = 1;
156         }
157 }
158 
159 /* get the mapped selector source name */
160 static int check_mapped_selector_name(struct mixer_build *state, int unitid,
161                                       int index, char *buf, int buflen)
162 {
163         const struct usbmix_selector_map *p;
164 
165         if (! state->selector_map)
166                 return 0;
167         for (p = state->selector_map; p->id; p++) {
168                 if (p->id == unitid && index < p->count)
169                         return strlcpy(buf, p->names[index], buflen);
170         }
171         return 0;
172 }
173 
174 /*
175  * find an audio control unit with the given unit id
176  */
177 static void *find_audio_control_unit(struct mixer_build *state, 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                 if (strcmp(kctl->id.name, "Effect Duration") == 0) {
813                         cval->min = 0x0000;
814                         cval->max = 0xffff;
815                         cval->res = 0x00e6;
816                         break;
817                 }
818                 if (strcmp(kctl->id.name, "Effect Volume") == 0 ||
819                     strcmp(kctl->id.name, "Effect Feedback Volume") == 0) {
820                         cval->min = 0x00;
821                         cval->max = 0xff;
822                         break;
823                 }
824                 if (strstr(kctl->id.name, "Effect Return") != NULL) {
825                         cval->min = 0xb706;
826                         cval->max = 0xff7b;
827                         cval->res = 0x0073;
828                         break;
829                 }
830                 if ((strstr(kctl->id.name, "Playback Volume") != NULL) ||
831                         (strstr(kctl->id.name, "Effect Send") != NULL)) {
832                         cval->min = 0xb5fb; /* -73 dB = 0xb6ff */
833                         cval->max = 0xfcfe;
834                         cval->res = 0x0073;
835                 }
836                 break;
837 
838         case USB_ID(0x0763, 0x2081): /* M-Audio Fast Track Ultra 8R */
839         case USB_ID(0x0763, 0x2080): /* M-Audio Fast Track Ultra */
840                 if (strcmp(kctl->id.name, "Effect Duration") == 0) {
841                         snd_printk(KERN_INFO
842                                 "usb-audio: set quirk for FTU Effect Duration\n");
843                         cval->min = 0x0000;
844                         cval->max = 0x7f00;
845                         cval->res = 0x0100;
846                         break;
847                 }
848                 if (strcmp(kctl->id.name, "Effect Volume") == 0 ||
849                     strcmp(kctl->id.name, "Effect Feedback Volume") == 0) {
850                         snd_printk(KERN_INFO
851                                 "usb-audio: set quirks for FTU Effect Feedback/Volume\n");
852                         cval->min = 0x00;
853                         cval->max = 0x7f;
854                         break;
855                 }
856                 break;
857 
858         case USB_ID(0x0471, 0x0101):
859         case USB_ID(0x0471, 0x0104):
860         case USB_ID(0x0471, 0x0105):
861         case USB_ID(0x0672, 0x1041):
862         /* quirk for UDA1321/N101.
863          * note that detection between firmware 2.1.1.7 (N101)
864          * and later 2.1.1.21 is not very clear from datasheets.
865          * I hope that the min value is -15360 for newer firmware --jk
866          */
867                 if (!strcmp(kctl->id.name, "PCM Playback Volume") &&
868                     cval->min == -15616) {
869                         snd_printk(KERN_INFO
870                                  "set volume quirk for UDA1321/N101 chip\n");
871                         cval->max = -256;
872                 }
873                 break;
874 
875         case USB_ID(0x046d, 0x09a4):
876                 if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
877                         snd_printk(KERN_INFO
878                                 "set volume quirk for QuickCam E3500\n");
879                         cval->min = 6080;
880                         cval->max = 8768;
881                         cval->res = 192;
882                 }
883                 break;
884 
885         case USB_ID(0x046d, 0x0808):
886         case USB_ID(0x046d, 0x0809):
887         case USB_ID(0x046d, 0x081d): /* HD Webcam c510 */
888         case USB_ID(0x046d, 0x0991):
889         /* Most audio usb devices lie about volume resolution.
890          * Most Logitech webcams have res = 384.
891          * Proboly there is some logitech magic behind this number --fishor
892          */
893                 if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
894                         snd_printk(KERN_INFO
895                                 "set resolution quirk: cval->res = 384\n");
896                         cval->res = 384;
897                 }
898                 break;
899 
900         }
901 }
902 
903 /*
904  * retrieve the minimum and maximum values for the specified control
905  */
906 static int get_min_max_with_quirks(struct usb_mixer_elem_info *cval,
907                                    int default_min, struct snd_kcontrol *kctl)
908 {
909         /* for failsafe */
910         cval->min = default_min;
911         cval->max = cval->min + 1;
912         cval->res = 1;
913         cval->dBmin = cval->dBmax = 0;
914 
915         if (cval->val_type == USB_MIXER_BOOLEAN ||
916             cval->val_type == USB_MIXER_INV_BOOLEAN) {
917                 cval->initialized = 1;
918         } else {
919                 int minchn = 0;
920                 if (cval->cmask) {
921                         int i;
922                         for (i = 0; i < MAX_CHANNELS; i++)
923                                 if (cval->cmask & (1 << i)) {
924                                         minchn = i + 1;
925                                         break;
926                                 }
927                 }
928                 if (get_ctl_value(cval, UAC_GET_MAX, (cval->control << 8) | minchn, &cval->max) < 0 ||
929                     get_ctl_value(cval, UAC_GET_MIN, (cval->control << 8) | minchn, &cval->min) < 0) {
930                         snd_printd(KERN_ERR "%d:%d: cannot get min/max values for control %d (id %d)\n",
931                                    cval->id, snd_usb_ctrl_intf(cval->mixer->chip), cval->control, cval->id);
932                         return -EINVAL;
933                 }
934                 if (get_ctl_value(cval, UAC_GET_RES, (cval->control << 8) | minchn, &cval->res) < 0) {
935                         cval->res = 1;
936                 } else {
937                         int last_valid_res = cval->res;
938 
939                         while (cval->res > 1) {
940                                 if (snd_usb_mixer_set_ctl_value(cval, UAC_SET_RES,
941                                                                 (cval->control << 8) | minchn, cval->res / 2) < 0)
942                                         break;
943                                 cval->res /= 2;
944                         }
945                         if (get_ctl_value(cval, UAC_GET_RES, (cval->control << 8) | minchn, &cval->res) < 0)
946                                 cval->res = last_valid_res;
947                 }
948                 if (cval->res == 0)
949                         cval->res = 1;
950 
951                 /* Additional checks for the proper resolution
952                  *
953                  * Some devices report smaller resolutions than actually
954                  * reacting.  They don't return errors but simply clip
955                  * to the lower aligned value.
956                  */
957                 if (cval->min + cval->res < cval->max) {
958                         int last_valid_res = cval->res;
959                         int saved, test, check;
960                         get_cur_mix_raw(cval, minchn, &saved);
961                         for (;;) {
962                                 test = saved;
963                                 if (test < cval->max)
964                                         test += cval->res;
965                                 else
966                                         test -= cval->res;
967                                 if (test < cval->min || test > cval->max ||
968                                     set_cur_mix_value(cval, minchn, 0, test) ||
969                                     get_cur_mix_raw(cval, minchn, &check)) {
970                                         cval->res = last_valid_res;
971                                         break;
972                                 }
973                                 if (test == check)
974                                         break;
975                                 cval->res *= 2;
976                         }
977                         set_cur_mix_value(cval, minchn, 0, saved);
978                 }
979 
980                 cval->initialized = 1;
981         }
982 
983         if (kctl)
984                 volume_control_quirks(cval, kctl);
985 
986         /* USB descriptions contain the dB scale in 1/256 dB unit
987          * while ALSA TLV contains in 1/100 dB unit
988          */
989         cval->dBmin = (convert_signed_value(cval, cval->min) * 100) / 256;
990         cval->dBmax = (convert_signed_value(cval, cval->max) * 100) / 256;
991         if (cval->dBmin > cval->dBmax) {
992                 /* something is wrong; assume it's either from/to 0dB */
993                 if (cval->dBmin < 0)
994                         cval->dBmax = 0;
995                 else if (cval->dBmin > 0)
996                         cval->dBmin = 0;
997                 if (cval->dBmin > cval->dBmax) {
998                         /* totally crap, return an error */
999                         return -EINVAL;
1000                 }
1001         }
1002 
1003         return 0;
1004 }
1005 
1006 #define get_min_max(cval, def)  get_min_max_with_quirks(cval, def, NULL)
1007 
1008 /* get a feature/mixer unit info */
1009 static int mixer_ctl_feature_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
1010 {
1011         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1012 
1013         if (cval->val_type == USB_MIXER_BOOLEAN ||
1014             cval->val_type == USB_MIXER_INV_BOOLEAN)
1015                 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1016         else
1017                 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
1018         uinfo->count = cval->channels;
1019         if (cval->val_type == USB_MIXER_BOOLEAN ||
1020             cval->val_type == USB_MIXER_INV_BOOLEAN) {
1021                 uinfo->value.integer.min = 0;
1022                 uinfo->value.integer.max = 1;
1023         } else {
1024                 if (!cval->initialized) {
1025                         get_min_max_with_quirks(cval, 0, kcontrol);
1026                         if (cval->initialized && cval->dBmin >= cval->dBmax) {
1027                                 kcontrol->vd[0].access &= 
1028                                         ~(SNDRV_CTL_ELEM_ACCESS_TLV_READ |
1029                                           SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK);
1030                                 snd_ctl_notify(cval->mixer->chip->card,
1031                                                SNDRV_CTL_EVENT_MASK_INFO,
1032                                                &kcontrol->id);
1033                         }
1034                 }
1035                 uinfo->value.integer.min = 0;
1036                 uinfo->value.integer.max =
1037                         (cval->max - cval->min + cval->res - 1) / cval->res;
1038         }
1039         return 0;
1040 }
1041 
1042 /* get the current value from feature/mixer unit */
1043 static int mixer_ctl_feature_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1044 {
1045         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1046         int c, cnt, val, err;
1047 
1048         ucontrol->value.integer.value[0] = cval->min;
1049         if (cval->cmask) {
1050                 cnt = 0;
1051                 for (c = 0; c < MAX_CHANNELS; c++) {
1052                         if (!(cval->cmask & (1 << c)))
1053                                 continue;
1054                         err = get_cur_mix_value(cval, c + 1, cnt, &val);
1055                         if (err < 0)
1056                                 return cval->mixer->ignore_ctl_error ? 0 : err;
1057                         val = get_relative_value(cval, val);
1058                         ucontrol->value.integer.value[cnt] = val;
1059                         cnt++;
1060                 }
1061                 return 0;
1062         } else {
1063                 /* master channel */
1064                 err = get_cur_mix_value(cval, 0, 0, &val);
1065                 if (err < 0)
1066                         return cval->mixer->ignore_ctl_error ? 0 : err;
1067                 val = get_relative_value(cval, val);
1068                 ucontrol->value.integer.value[0] = val;
1069         }
1070         return 0;
1071 }
1072 
1073 /* put the current value to feature/mixer unit */
1074 static int mixer_ctl_feature_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1075 {
1076         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1077         int c, cnt, val, oval, err;
1078         int changed = 0;
1079 
1080         if (cval->cmask) {
1081                 cnt = 0;
1082                 for (c = 0; c < MAX_CHANNELS; c++) {
1083                         if (!(cval->cmask & (1 << c)))
1084                                 continue;
1085                         err = get_cur_mix_value(cval, c + 1, cnt, &oval);
1086                         if (err < 0)
1087                                 return cval->mixer->ignore_ctl_error ? 0 : err;
1088                         val = ucontrol->value.integer.value[cnt];
1089                         val = get_abs_value(cval, val);
1090                         if (oval != val) {
1091                                 set_cur_mix_value(cval, c + 1, cnt, val);
1092                                 changed = 1;
1093                         }
1094                         cnt++;
1095                 }
1096         } else {
1097                 /* master channel */
1098                 err = get_cur_mix_value(cval, 0, 0, &oval);
1099                 if (err < 0)
1100                         return cval->mixer->ignore_ctl_error ? 0 : err;
1101                 val = ucontrol->value.integer.value[0];
1102                 val = get_abs_value(cval, val);
1103                 if (val != oval) {
1104                         set_cur_mix_value(cval, 0, 0, val);
1105                         changed = 1;
1106                 }
1107         }
1108         return changed;
1109 }
1110 
1111 static struct snd_kcontrol_new usb_feature_unit_ctl = {
1112         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1113         .name = "", /* will be filled later manually */
1114         .info = mixer_ctl_feature_info,
1115         .get = mixer_ctl_feature_get,
1116         .put = mixer_ctl_feature_put,
1117 };
1118 
1119 /* the read-only variant */
1120 static struct snd_kcontrol_new usb_feature_unit_ctl_ro = {
1121         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1122         .name = "", /* will be filled later manually */
1123         .info = mixer_ctl_feature_info,
1124         .get = mixer_ctl_feature_get,
1125         .put = NULL,
1126 };
1127 
1128 /* This symbol is exported in order to allow the mixer quirks to
1129  * hook up to the standard feature unit control mechanism */
1130 struct snd_kcontrol_new *snd_usb_feature_unit_ctl = &usb_feature_unit_ctl;
1131 
1132 /*
1133  * build a feature control
1134  */
1135 
1136 static size_t append_ctl_name(struct snd_kcontrol *kctl, const char *str)
1137 {
1138         return strlcat(kctl->id.name, str, sizeof(kctl->id.name));
1139 }
1140 
1141 /* A lot of headsets/headphones have a "Speaker" mixer. Make sure we
1142    rename it to "Headphone". We determine if something is a headphone
1143    similar to how udev determines form factor. */
1144 static void check_no_speaker_on_headset(struct snd_kcontrol *kctl,
1145                                         struct snd_card *card)
1146 {
1147         const char *names_to_check[] = {
1148                 "Headset", "headset", "Headphone", "headphone", NULL};
1149         const char **s;
1150         bool found = 0;
1151 
1152         if (strcmp("Speaker", kctl->id.name))
1153                 return;
1154 
1155         for (s = names_to_check; *s; s++)
1156                 if (strstr(card->shortname, *s)) {
1157                         found = 1;
1158                         break;
1159                 }
1160 
1161         if (!found)
1162                 return;
1163 
1164         strlcpy(kctl->id.name, "Headphone", sizeof(kctl->id.name));
1165 }
1166 
1167 static void build_feature_ctl(struct mixer_build *state, void *raw_desc,
1168                               unsigned int ctl_mask, int control,
1169                               struct usb_audio_term *iterm, int unitid,
1170                               int readonly_mask)
1171 {
1172         struct uac_feature_unit_descriptor *desc = raw_desc;
1173         unsigned int len = 0;
1174         int mapped_name = 0;
1175         int nameid = uac_feature_unit_iFeature(desc);
1176         struct snd_kcontrol *kctl;
1177         struct usb_mixer_elem_info *cval;
1178         const struct usbmix_name_map *map;
1179         unsigned int range;
1180 
1181         control++; /* change from zero-based to 1-based value */
1182 
1183         if (control == UAC_FU_GRAPHIC_EQUALIZER) {
1184                 /* FIXME: not supported yet */
1185                 return;
1186         }
1187 
1188         map = find_map(state, unitid, control);
1189         if (check_ignored_ctl(map))
1190                 return;
1191 
1192         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1193         if (! cval) {
1194                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1195                 return;
1196         }
1197         cval->mixer = state->mixer;
1198         cval->id = unitid;
1199         cval->control = control;
1200         cval->cmask = ctl_mask;
1201         cval->val_type = audio_feature_info[control-1].type;
1202         if (ctl_mask == 0) {
1203                 cval->channels = 1;     /* master channel */
1204                 cval->master_readonly = readonly_mask;
1205         } else {
1206                 int i, c = 0;
1207                 for (i = 0; i < 16; i++)
1208                         if (ctl_mask & (1 << i))
1209                                 c++;
1210                 cval->channels = c;
1211                 cval->ch_readonly = readonly_mask;
1212         }
1213 
1214         /* if all channels in the mask are marked read-only, make the control
1215          * read-only. set_cur_mix_value() will check the mask again and won't
1216          * issue write commands to read-only channels. */
1217         if (cval->channels == readonly_mask)
1218                 kctl = snd_ctl_new1(&usb_feature_unit_ctl_ro, cval);
1219         else
1220                 kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
1221 
1222         if (! kctl) {
1223                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1224                 kfree(cval);
1225                 return;
1226         }
1227         kctl->private_free = usb_mixer_elem_free;
1228 
1229         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
1230         mapped_name = len != 0;
1231         if (! len && nameid)
1232                 len = snd_usb_copy_string_desc(state, nameid,
1233                                 kctl->id.name, sizeof(kctl->id.name));
1234 
1235         switch (control) {
1236         case UAC_FU_MUTE:
1237         case UAC_FU_VOLUME:
1238                 /* determine the control name.  the rule is:
1239                  * - if a name id is given in descriptor, use it.
1240                  * - if the connected input can be determined, then use the name
1241                  *   of terminal type.
1242                  * - if the connected output can be determined, use it.
1243                  * - otherwise, anonymous name.
1244                  */
1245                 if (! len) {
1246                         len = get_term_name(state, iterm, kctl->id.name, sizeof(kctl->id.name), 1);
1247                         if (! len)
1248                                 len = get_term_name(state, &state->oterm, kctl->id.name, sizeof(kctl->id.name), 1);
1249                         if (! len)
1250                                 len = snprintf(kctl->id.name, sizeof(kctl->id.name),
1251                                                "Feature %d", unitid);
1252                 }
1253 
1254                 if (!mapped_name)
1255                         check_no_speaker_on_headset(kctl, state->mixer->chip->card);
1256 
1257                 /* determine the stream direction:
1258                  * if the connected output is USB stream, then it's likely a
1259                  * capture stream.  otherwise it should be playback (hopefully :)
1260                  */
1261                 if (! mapped_name && ! (state->oterm.type >> 16)) {
1262                         if ((state->oterm.type & 0xff00) == 0x0100) {
1263                                 len = append_ctl_name(kctl, " Capture");
1264                         } else {
1265                                 len = append_ctl_name(kctl, " Playback");
1266                         }
1267                 }
1268                 append_ctl_name(kctl, control == UAC_FU_MUTE ?
1269                                 " Switch" : " Volume");
1270                 break;
1271         default:
1272                 if (! len)
1273                         strlcpy(kctl->id.name, audio_feature_info[control-1].name,
1274                                 sizeof(kctl->id.name));
1275                 break;
1276         }
1277 
1278         /* get min/max values */
1279         get_min_max_with_quirks(cval, 0, kctl);
1280 
1281         if (control == UAC_FU_VOLUME) {
1282                 check_mapped_dB(map, cval);
1283                 if (cval->dBmin < cval->dBmax || !cval->initialized) {
1284                         kctl->tlv.c = snd_usb_mixer_vol_tlv;
1285                         kctl->vd[0].access |=
1286                                 SNDRV_CTL_ELEM_ACCESS_TLV_READ |
1287                                 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
1288                 }
1289         }
1290 
1291         range = (cval->max - cval->min) / cval->res;
1292         /* Are there devices with volume range more than 255? I use a bit more
1293          * to be sure. 384 is a resolution magic number found on Logitech
1294          * devices. It will definitively catch all buggy Logitech devices.
1295          */
1296         if (range > 384) {
1297                 snd_printk(KERN_WARNING "usb_audio: Warning! Unlikely big "
1298                            "volume range (=%u), cval->res is probably wrong.",
1299                            range);
1300                 snd_printk(KERN_WARNING "usb_audio: [%d] FU [%s] ch = %d, "
1301                            "val = %d/%d/%d", cval->id,
1302                            kctl->id.name, cval->channels,
1303                            cval->min, cval->max, cval->res);
1304         }
1305 
1306         snd_printdd(KERN_INFO "[%d] FU [%s] ch = %d, val = %d/%d/%d\n",
1307                     cval->id, kctl->id.name, cval->channels, cval->min, cval->max, cval->res);
1308         snd_usb_mixer_add_control(state->mixer, kctl);
1309 }
1310 
1311 
1312 
1313 /*
1314  * parse a feature unit
1315  *
1316  * most of controls are defined here.
1317  */
1318 static int parse_audio_feature_unit(struct mixer_build *state, int unitid, void *_ftr)
1319 {
1320         int channels, i, j;
1321         struct usb_audio_term iterm;
1322         unsigned int master_bits, first_ch_bits;
1323         int err, csize;
1324         struct uac_feature_unit_descriptor *hdr = _ftr;
1325         __u8 *bmaControls;
1326 
1327         if (state->mixer->protocol == UAC_VERSION_1) {
1328                 csize = hdr->bControlSize;
1329                 if (!csize) {
1330                         snd_printdd(KERN_ERR "usbaudio: unit %u: "
1331                                     "invalid bControlSize == 0\n", unitid);
1332                         return -EINVAL;
1333                 }
1334                 channels = (hdr->bLength - 7) / csize - 1;
1335                 bmaControls = hdr->bmaControls;
1336                 if (hdr->bLength < 7 + csize) {
1337                         snd_printk(KERN_ERR "usbaudio: unit %u: "
1338                                    "invalid UAC_FEATURE_UNIT descriptor\n",
1339                                    unitid);
1340                         return -EINVAL;
1341                 }
1342         } else {
1343                 struct uac2_feature_unit_descriptor *ftr = _ftr;
1344                 csize = 4;
1345                 channels = (hdr->bLength - 6) / 4 - 1;
1346                 bmaControls = ftr->bmaControls;
1347                 if (hdr->bLength < 6 + csize) {
1348                         snd_printk(KERN_ERR "usbaudio: unit %u: "
1349                                    "invalid UAC_FEATURE_UNIT descriptor\n",
1350                                    unitid);
1351                         return -EINVAL;
1352                 }
1353         }
1354 
1355         /* parse the source unit */
1356         if ((err = parse_audio_unit(state, hdr->bSourceID)) < 0)
1357                 return err;
1358 
1359         /* determine the input source type and name */
1360         err = check_input_term(state, hdr->bSourceID, &iterm);
1361         if (err < 0)
1362                 return err;
1363 
1364         master_bits = snd_usb_combine_bytes(bmaControls, csize);
1365         /* master configuration quirks */
1366         switch (state->chip->usb_id) {
1367         case USB_ID(0x08bb, 0x2702):
1368                 snd_printk(KERN_INFO
1369                            "usbmixer: master volume quirk for PCM2702 chip\n");
1370                 /* disable non-functional volume control */
1371                 master_bits &= ~UAC_CONTROL_BIT(UAC_FU_VOLUME);
1372                 break;
1373         case USB_ID(0x1130, 0xf211):
1374                 snd_printk(KERN_INFO
1375                            "usbmixer: volume control quirk for Tenx TP6911 Audio Headset\n");
1376                 /* disable non-functional volume control */
1377                 channels = 0;
1378                 break;
1379 
1380         }
1381         if (channels > 0)
1382                 first_ch_bits = snd_usb_combine_bytes(bmaControls + csize, csize);
1383         else
1384                 first_ch_bits = 0;
1385 
1386         if (state->mixer->protocol == UAC_VERSION_1) {
1387                 /* check all control types */
1388                 for (i = 0; i < 10; i++) {
1389                         unsigned int ch_bits = 0;
1390                         for (j = 0; j < channels; j++) {
1391                                 unsigned int mask = snd_usb_combine_bytes(bmaControls + csize * (j+1), csize);
1392                                 if (mask & (1 << i))
1393                                         ch_bits |= (1 << j);
1394                         }
1395                         /* audio class v1 controls are never read-only */
1396                         if (ch_bits & 1) /* the first channel must be set (for ease of programming) */
1397                                 build_feature_ctl(state, _ftr, ch_bits, i, &iterm, unitid, 0);
1398                         if (master_bits & (1 << i))
1399                                 build_feature_ctl(state, _ftr, 0, i, &iterm, unitid, 0);
1400                 }
1401         } else { /* UAC_VERSION_2 */
1402                 for (i = 0; i < ARRAY_SIZE(audio_feature_info); i++) {
1403                         unsigned int ch_bits = 0;
1404                         unsigned int ch_read_only = 0;
1405 
1406                         for (j = 0; j < channels; j++) {
1407                                 unsigned int mask = snd_usb_combine_bytes(bmaControls + csize * (j+1), csize);
1408                                 if (uac2_control_is_readable(mask, i)) {
1409                                         ch_bits |= (1 << j);
1410                                         if (!uac2_control_is_writeable(mask, i))
1411                                                 ch_read_only |= (1 << j);
1412                                 }
1413                         }
1414 
1415                         /* NOTE: build_feature_ctl() will mark the control read-only if all channels
1416                          * are marked read-only in the descriptors. Otherwise, the control will be
1417                          * reported as writeable, but the driver will not actually issue a write
1418                          * command for read-only channels */
1419                         if (ch_bits & 1) /* the first channel must be set (for ease of programming) */
1420                                 build_feature_ctl(state, _ftr, ch_bits, i, &iterm, unitid, ch_read_only);
1421                         if (uac2_control_is_readable(master_bits, i))
1422                                 build_feature_ctl(state, _ftr, 0, i, &iterm, unitid,
1423                                                   !uac2_control_is_writeable(master_bits, i));
1424                 }
1425         }
1426 
1427         return 0;
1428 }
1429 
1430 
1431 /*
1432  * Mixer Unit
1433  */
1434 
1435 /*
1436  * build a mixer unit control
1437  *
1438  * the callbacks are identical with feature unit.
1439  * input channel number (zero based) is given in control field instead.
1440  */
1441 
1442 static void build_mixer_unit_ctl(struct mixer_build *state,
1443                                  struct uac_mixer_unit_descriptor *desc,
1444                                  int in_pin, int in_ch, int unitid,
1445                                  struct usb_audio_term *iterm)
1446 {
1447         struct usb_mixer_elem_info *cval;
1448         unsigned int num_outs = uac_mixer_unit_bNrChannels(desc);
1449         unsigned int i, len;
1450         struct snd_kcontrol *kctl;
1451         const struct usbmix_name_map *map;
1452 
1453         map = find_map(state, unitid, 0);
1454         if (check_ignored_ctl(map))
1455                 return;
1456 
1457         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1458         if (! cval)
1459                 return;
1460 
1461         cval->mixer = state->mixer;
1462         cval->id = unitid;
1463         cval->control = in_ch + 1; /* based on 1 */
1464         cval->val_type = USB_MIXER_S16;
1465         for (i = 0; i < num_outs; i++) {
1466                 if (check_matrix_bitmap(uac_mixer_unit_bmControls(desc, state->mixer->protocol), in_ch, i, num_outs)) {
1467                         cval->cmask |= (1 << i);
1468                         cval->channels++;
1469                 }
1470         }
1471 
1472         /* get min/max values */
1473         get_min_max(cval, 0);
1474 
1475         kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
1476         if (! kctl) {
1477                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1478                 kfree(cval);
1479                 return;
1480         }
1481         kctl->private_free = usb_mixer_elem_free;
1482 
1483         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
1484         if (! len)
1485                 len = get_term_name(state, iterm, kctl->id.name, sizeof(kctl->id.name), 0);
1486         if (! len)
1487                 len = sprintf(kctl->id.name, "Mixer Source %d", in_ch + 1);
1488         append_ctl_name(kctl, " Volume");
1489 
1490         snd_printdd(KERN_INFO "[%d] MU [%s] ch = %d, val = %d/%d\n",
1491                     cval->id, kctl->id.name, cval->channels, cval->min, cval->max);
1492         snd_usb_mixer_add_control(state->mixer, kctl);
1493 }
1494 
1495 
1496 /*
1497  * parse a mixer unit
1498  */
1499 static int parse_audio_mixer_unit(struct mixer_build *state, int unitid, void *raw_desc)
1500 {
1501         struct uac_mixer_unit_descriptor *desc = raw_desc;
1502         struct usb_audio_term iterm;
1503         int input_pins, num_ins, num_outs;
1504         int pin, ich, err;
1505 
1506         if (desc->bLength < 11 || ! (input_pins = desc->bNrInPins) || ! (num_outs = uac_mixer_unit_bNrChannels(desc))) {
1507                 snd_printk(KERN_ERR "invalid MIXER UNIT descriptor %d\n", unitid);
1508                 return -EINVAL;
1509         }
1510         /* no bmControls field (e.g. Maya44) -> ignore */
1511         if (desc->bLength <= 10 + input_pins) {
1512                 snd_printdd(KERN_INFO "MU %d has no bmControls field\n", unitid);
1513                 return 0;
1514         }
1515 
1516         num_ins = 0;
1517         ich = 0;
1518         for (pin = 0; pin < input_pins; pin++) {
1519                 err = parse_audio_unit(state, desc->baSourceID[pin]);
1520                 if (err < 0)
1521                         continue;
1522                 err = check_input_term(state, desc->baSourceID[pin], &iterm);
1523                 if (err < 0)
1524                         return err;
1525                 num_ins += iterm.channels;
1526                 for (; ich < num_ins; ++ich) {
1527                         int och, ich_has_controls = 0;
1528 
1529                         for (och = 0; och < num_outs; ++och) {
1530                                 if (check_matrix_bitmap(uac_mixer_unit_bmControls(desc, state->mixer->protocol),
1531                                                         ich, och, num_outs)) {
1532                                         ich_has_controls = 1;
1533                                         break;
1534                                 }
1535                         }
1536                         if (ich_has_controls)
1537                                 build_mixer_unit_ctl(state, desc, pin, ich,
1538                                                      unitid, &iterm);
1539                 }
1540         }
1541         return 0;
1542 }
1543 
1544 
1545 /*
1546  * Processing Unit / Extension Unit
1547  */
1548 
1549 /* get callback for processing/extension unit */
1550 static int mixer_ctl_procunit_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1551 {
1552         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1553         int err, val;
1554 
1555         err = get_cur_ctl_value(cval, cval->control << 8, &val);
1556         if (err < 0 && cval->mixer->ignore_ctl_error) {
1557                 ucontrol->value.integer.value[0] = cval->min;
1558                 return 0;
1559         }
1560         if (err < 0)
1561                 return err;
1562         val = get_relative_value(cval, val);
1563         ucontrol->value.integer.value[0] = val;
1564         return 0;
1565 }
1566 
1567 /* put callback for processing/extension unit */
1568 static int mixer_ctl_procunit_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1569 {
1570         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1571         int val, oval, err;
1572 
1573         err = get_cur_ctl_value(cval, cval->control << 8, &oval);
1574         if (err < 0) {
1575                 if (cval->mixer->ignore_ctl_error)
1576                         return 0;
1577                 return err;
1578         }
1579         val = ucontrol->value.integer.value[0];
1580         val = get_abs_value(cval, val);
1581         if (val != oval) {
1582                 set_cur_ctl_value(cval, cval->control << 8, val);
1583                 return 1;
1584         }
1585         return 0;
1586 }
1587 
1588 /* alsa control interface for processing/extension unit */
1589 static struct snd_kcontrol_new mixer_procunit_ctl = {
1590         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1591         .name = "", /* will be filled later */
1592         .info = mixer_ctl_feature_info,
1593         .get = mixer_ctl_procunit_get,
1594         .put = mixer_ctl_procunit_put,
1595 };
1596 
1597 
1598 /*
1599  * predefined data for processing units
1600  */
1601 struct procunit_value_info {
1602         int control;
1603         char *suffix;
1604         int val_type;
1605         int min_value;
1606 };
1607 
1608 struct procunit_info {
1609         int type;
1610         char *name;
1611         struct procunit_value_info *values;
1612 };
1613 
1614 static struct procunit_value_info updown_proc_info[] = {
1615         { UAC_UD_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1616         { UAC_UD_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
1617         { 0 }
1618 };
1619 static struct procunit_value_info prologic_proc_info[] = {
1620         { UAC_DP_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1621         { UAC_DP_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
1622         { 0 }
1623 };
1624 static struct procunit_value_info threed_enh_proc_info[] = {
1625         { UAC_3D_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1626         { UAC_3D_SPACE, "Spaciousness", USB_MIXER_U8 },
1627         { 0 }
1628 };
1629 static struct procunit_value_info reverb_proc_info[] = {
1630         { UAC_REVERB_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1631         { UAC_REVERB_LEVEL, "Level", USB_MIXER_U8 },
1632         { UAC_REVERB_TIME, "Time", USB_MIXER_U16 },
1633         { UAC_REVERB_FEEDBACK, "Feedback", USB_MIXER_U8 },
1634         { 0 }
1635 };
1636 static struct procunit_value_info chorus_proc_info[] = {
1637         { UAC_CHORUS_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1638         { UAC_CHORUS_LEVEL, "Level", USB_MIXER_U8 },
1639         { UAC_CHORUS_RATE, "Rate", USB_MIXER_U16 },
1640         { UAC_CHORUS_DEPTH, "Depth", USB_MIXER_U16 },
1641         { 0 }
1642 };
1643 static struct procunit_value_info dcr_proc_info[] = {
1644         { UAC_DCR_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1645         { UAC_DCR_RATE, "Ratio", USB_MIXER_U16 },
1646         { UAC_DCR_MAXAMPL, "Max Amp", USB_MIXER_S16 },
1647         { UAC_DCR_THRESHOLD, "Threshold", USB_MIXER_S16 },
1648         { UAC_DCR_ATTACK_TIME, "Attack Time", USB_MIXER_U16 },
1649         { UAC_DCR_RELEASE_TIME, "Release Time", USB_MIXER_U16 },
1650         { 0 }
1651 };
1652 
1653 static struct procunit_info procunits[] = {
1654         { UAC_PROCESS_UP_DOWNMIX, "Up Down", updown_proc_info },
1655         { UAC_PROCESS_DOLBY_PROLOGIC, "Dolby Prologic", prologic_proc_info },
1656         { UAC_PROCESS_STEREO_EXTENDER, "3D Stereo Extender", threed_enh_proc_info },
1657         { UAC_PROCESS_REVERB, "Reverb", reverb_proc_info },
1658         { UAC_PROCESS_CHORUS, "Chorus", chorus_proc_info },
1659         { UAC_PROCESS_DYN_RANGE_COMP, "DCR", dcr_proc_info },
1660         { 0 },
1661 };
1662 /*
1663  * predefined data for extension units
1664  */
1665 static struct procunit_value_info clock_rate_xu_info[] = {
1666         { USB_XU_CLOCK_RATE_SELECTOR, "Selector", USB_MIXER_U8, 0 },
1667         { 0 }
1668 };
1669 static struct procunit_value_info clock_source_xu_info[] = {
1670         { USB_XU_CLOCK_SOURCE_SELECTOR, "External", USB_MIXER_BOOLEAN },
1671         { 0 }
1672 };
1673 static struct procunit_value_info spdif_format_xu_info[] = {
1674         { USB_XU_DIGITAL_FORMAT_SELECTOR, "SPDIF/AC3", USB_MIXER_BOOLEAN },
1675         { 0 }
1676 };
1677 static struct procunit_value_info soft_limit_xu_info[] = {
1678         { USB_XU_SOFT_LIMIT_SELECTOR, " ", USB_MIXER_BOOLEAN },
1679         { 0 }
1680 };
1681 static struct procunit_info extunits[] = {
1682         { USB_XU_CLOCK_RATE, "Clock rate", clock_rate_xu_info },
1683         { USB_XU_CLOCK_SOURCE, "DigitalIn CLK source", clock_source_xu_info },
1684         { USB_XU_DIGITAL_IO_STATUS, "DigitalOut format:", spdif_format_xu_info },
1685         { USB_XU_DEVICE_OPTIONS, "AnalogueIn Soft Limit", soft_limit_xu_info },
1686         { 0 }
1687 };
1688 /*
1689  * build a processing/extension unit
1690  */
1691 static int build_audio_procunit(struct mixer_build *state, int unitid, void *raw_desc, struct procunit_info *list, char *name)
1692 {
1693         struct uac_processing_unit_descriptor *desc = raw_desc;
1694         int num_ins = desc->bNrInPins;
1695         struct usb_mixer_elem_info *cval;
1696         struct snd_kcontrol *kctl;
1697         int i, err, nameid, type, len;
1698         struct procunit_info *info;
1699         struct procunit_value_info *valinfo;
1700         const struct usbmix_name_map *map;
1701         static struct procunit_value_info default_value_info[] = {
1702                 { 0x01, "Switch", USB_MIXER_BOOLEAN },
1703                 { 0 }
1704         };
1705         static struct procunit_info default_info = {
1706                 0, NULL, default_value_info
1707         };
1708 
1709         if (desc->bLength < 13 || desc->bLength < 13 + num_ins ||
1710             desc->bLength < num_ins + uac_processing_unit_bControlSize(desc, state->mixer->protocol)) {
1711                 snd_printk(KERN_ERR "invalid %s descriptor (id %d)\n", name, unitid);
1712                 return -EINVAL;
1713         }
1714 
1715         for (i = 0; i < num_ins; i++) {
1716                 if ((err = parse_audio_unit(state, desc->baSourceID[i])) < 0)
1717                         return err;
1718         }
1719 
1720         type = le16_to_cpu(desc->wProcessType);
1721         for (info = list; info && info->type; info++)
1722                 if (info->type == type)
1723                         break;
1724         if (! info || ! info->type)
1725                 info = &default_info;
1726 
1727         for (valinfo = info->values; valinfo->control; valinfo++) {
1728                 __u8 *controls = uac_processing_unit_bmControls(desc, state->mixer->protocol);
1729 
1730                 if (! (controls[valinfo->control / 8] & (1 << ((valinfo->control % 8) - 1))))
1731                         continue;
1732                 map = find_map(state, unitid, valinfo->control);
1733                 if (check_ignored_ctl(map))
1734                         continue;
1735                 cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1736                 if (! cval) {
1737                         snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1738                         return -ENOMEM;
1739                 }
1740                 cval->mixer = state->mixer;
1741                 cval->id = unitid;
1742                 cval->control = valinfo->control;
1743                 cval->val_type = valinfo->val_type;
1744                 cval->channels = 1;
1745 
1746                 /* get min/max values */
1747                 if (type == UAC_PROCESS_UP_DOWNMIX && cval->control == UAC_UD_MODE_SELECT) {
1748                         __u8 *control_spec = uac_processing_unit_specific(desc, state->mixer->protocol);
1749                         /* FIXME: hard-coded */
1750                         cval->min = 1;
1751                         cval->max = control_spec[0];
1752                         cval->res = 1;
1753                         cval->initialized = 1;
1754                 } else {
1755                         if (type == USB_XU_CLOCK_RATE) {
1756                                 /* E-Mu USB 0404/0202/TrackerPre/0204
1757                                  * samplerate control quirk
1758                                  */
1759                                 cval->min = 0;
1760                                 cval->max = 5;
1761                                 cval->res = 1;
1762                                 cval->initialized = 1;
1763                         } else
1764                                 get_min_max(cval, valinfo->min_value);
1765                 }
1766 
1767                 kctl = snd_ctl_new1(&mixer_procunit_ctl, cval);
1768                 if (! kctl) {
1769                         snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1770                         kfree(cval);
1771                         return -ENOMEM;
1772                 }
1773                 kctl->private_free = usb_mixer_elem_free;
1774 
1775                 if (check_mapped_name(map, kctl->id.name,
1776                                                 sizeof(kctl->id.name)))
1777                         /* nothing */ ;
1778                 else if (info->name)
1779                         strlcpy(kctl->id.name, info->name, sizeof(kctl->id.name));
1780                 else {
1781                         nameid = uac_processing_unit_iProcessing(desc, state->mixer->protocol);
1782                         len = 0;
1783                         if (nameid)
1784                                 len = snd_usb_copy_string_desc(state, nameid, kctl->id.name, sizeof(kctl->id.name));
1785                         if (! len)
1786                                 strlcpy(kctl->id.name, name, sizeof(kctl->id.name));
1787                 }
1788                 append_ctl_name(kctl, " ");
1789                 append_ctl_name(kctl, valinfo->suffix);
1790 
1791                 snd_printdd(KERN_INFO "[%d] PU [%s] ch = %d, val = %d/%d\n",
1792                             cval->id, kctl->id.name, cval->channels, cval->min, cval->max);
1793                 if ((err = snd_usb_mixer_add_control(state->mixer, kctl)) < 0)
1794                         return err;
1795         }
1796         return 0;
1797 }
1798 
1799 
1800 static int parse_audio_processing_unit(struct mixer_build *state, int unitid, void *raw_desc)
1801 {
1802         return build_audio_procunit(state, unitid, raw_desc, procunits, "Processing Unit");
1803 }
1804 
1805 static int parse_audio_extension_unit(struct mixer_build *state, int unitid, void *raw_desc)
1806 {
1807         /* Note that we parse extension units with processing unit descriptors.
1808          * That's ok as the layout is the same */
1809         return build_audio_procunit(state, unitid, raw_desc, extunits, "Extension Unit");
1810 }
1811 
1812 
1813 /*
1814  * Selector Unit
1815  */
1816 
1817 /* info callback for selector unit
1818  * use an enumerator type for routing
1819  */
1820 static int mixer_ctl_selector_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
1821 {
1822         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1823         const char **itemlist = (const char **)kcontrol->private_value;
1824 
1825         if (snd_BUG_ON(!itemlist))
1826                 return -EINVAL;
1827         return snd_ctl_enum_info(uinfo, 1, cval->max, itemlist);
1828 }
1829 
1830 /* get callback for selector unit */
1831 static int mixer_ctl_selector_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1832 {
1833         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1834         int val, err;
1835 
1836         err = get_cur_ctl_value(cval, cval->control << 8, &val);
1837         if (err < 0) {
1838                 if (cval->mixer->ignore_ctl_error) {
1839                         ucontrol->value.enumerated.item[0] = 0;
1840                         return 0;
1841                 }
1842                 return err;
1843         }
1844         val = get_relative_value(cval, val);
1845         ucontrol->value.enumerated.item[0] = val;
1846         return 0;
1847 }
1848 
1849 /* put callback for selector unit */
1850 static int mixer_ctl_selector_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1851 {
1852         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1853         int val, oval, err;
1854 
1855         err = get_cur_ctl_value(cval, cval->control << 8, &oval);
1856         if (err < 0) {
1857                 if (cval->mixer->ignore_ctl_error)
1858                         return 0;
1859                 return err;
1860         }
1861         val = ucontrol->value.enumerated.item[0];
1862         val = get_abs_value(cval, val);
1863         if (val != oval) {
1864                 set_cur_ctl_value(cval, cval->control << 8, val);
1865                 return 1;
1866         }
1867         return 0;
1868 }
1869 
1870 /* alsa control interface for selector unit */
1871 static struct snd_kcontrol_new mixer_selectunit_ctl = {
1872         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1873         .name = "", /* will be filled later */
1874         .info = mixer_ctl_selector_info,
1875         .get = mixer_ctl_selector_get,
1876         .put = mixer_ctl_selector_put,
1877 };
1878 
1879 
1880 /* private free callback.
1881  * free both private_data and private_value
1882  */
1883 static void usb_mixer_selector_elem_free(struct snd_kcontrol *kctl)
1884 {
1885         int i, num_ins = 0;
1886 
1887         if (kctl->private_data) {
1888                 struct usb_mixer_elem_info *cval = kctl->private_data;
1889                 num_ins = cval->max;
1890                 kfree(cval);
1891                 kctl->private_data = NULL;
1892         }
1893         if (kctl->private_value) {
1894                 char **itemlist = (char **)kctl->private_value;
1895                 for (i = 0; i < num_ins; i++)
1896                         kfree(itemlist[i]);
1897                 kfree(itemlist);
1898                 kctl->private_value = 0;
1899         }
1900 }
1901 
1902 /*
1903  * parse a selector unit
1904  */
1905 static int parse_audio_selector_unit(struct mixer_build *state, int unitid, void *raw_desc)
1906 {
1907         struct uac_selector_unit_descriptor *desc = raw_desc;
1908         unsigned int i, nameid, len;
1909         int err;
1910         struct usb_mixer_elem_info *cval;
1911         struct snd_kcontrol *kctl;
1912         const struct usbmix_name_map *map;
1913         char **namelist;
1914 
1915         if (!desc->bNrInPins || desc->bLength < 5 + desc->bNrInPins) {
1916                 snd_printk(KERN_ERR "invalid SELECTOR UNIT descriptor %d\n", unitid);
1917                 return -EINVAL;
1918         }
1919 
1920         for (i = 0; i < desc->bNrInPins; i++) {
1921                 if ((err = parse_audio_unit(state, desc->baSourceID[i])) < 0)
1922                         return err;
1923         }
1924 
1925         if (desc->bNrInPins == 1) /* only one ? nonsense! */
1926                 return 0;
1927 
1928         map = find_map(state, unitid, 0);
1929         if (check_ignored_ctl(map))
1930                 return 0;
1931 
1932         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1933         if (! cval) {
1934                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1935                 return -ENOMEM;
1936         }
1937         cval->mixer = state->mixer;
1938         cval->id = unitid;
1939         cval->val_type = USB_MIXER_U8;
1940         cval->channels = 1;
1941         cval->min = 1;
1942         cval->max = desc->bNrInPins;
1943         cval->res = 1;
1944         cval->initialized = 1;
1945 
1946         if (desc->bDescriptorSubtype == UAC2_CLOCK_SELECTOR)
1947                 cval->control = UAC2_CX_CLOCK_SELECTOR;
1948         else
1949                 cval->control = 0;
1950 
1951         namelist = kmalloc(sizeof(char *) * desc->bNrInPins, GFP_KERNEL);
1952         if (! namelist) {
1953                 snd_printk(KERN_ERR "cannot malloc\n");
1954                 kfree(cval);
1955                 return -ENOMEM;
1956         }
1957 #define MAX_ITEM_NAME_LEN       64
1958         for (i = 0; i < desc->bNrInPins; i++) {
1959                 struct usb_audio_term iterm;
1960                 len = 0;
1961                 namelist[i] = kmalloc(MAX_ITEM_NAME_LEN, GFP_KERNEL);
1962                 if (! namelist[i]) {
1963                         snd_printk(KERN_ERR "cannot malloc\n");
1964                         while (i--)
1965                                 kfree(namelist[i]);
1966                         kfree(namelist);
1967                         kfree(cval);
1968                         return -ENOMEM;
1969                 }
1970                 len = check_mapped_selector_name(state, unitid, i, namelist[i],
1971                                                  MAX_ITEM_NAME_LEN);
1972                 if (! len && check_input_term(state, desc->baSourceID[i], &iterm) >= 0)
1973                         len = get_term_name(state, &iterm, namelist[i], MAX_ITEM_NAME_LEN, 0);
1974                 if (! len)
1975                         sprintf(namelist[i], "Input %d", i);
1976         }
1977 
1978         kctl = snd_ctl_new1(&mixer_selectunit_ctl, cval);
1979         if (! kctl) {
1980                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1981                 kfree(namelist);
1982                 kfree(cval);
1983                 return -ENOMEM;
1984         }
1985         kctl->private_value = (unsigned long)namelist;
1986         kctl->private_free = usb_mixer_selector_elem_free;
1987 
1988         nameid = uac_selector_unit_iSelector(desc);
1989         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
1990         if (len)
1991                 ;
1992         else if (nameid)
1993                 snd_usb_copy_string_desc(state, nameid, kctl->id.name, sizeof(kctl->id.name));
1994         else {
1995                 len = get_term_name(state, &state->oterm,
1996                                     kctl->id.name, sizeof(kctl->id.name), 0);
1997                 if (! len)
1998                         strlcpy(kctl->id.name, "USB", sizeof(kctl->id.name));
1999 
2000                 if (desc->bDescriptorSubtype == UAC2_CLOCK_SELECTOR)
2001                         append_ctl_name(kctl, " Clock Source");
2002                 else if ((state->oterm.type & 0xff00) == 0x0100)
2003                         append_ctl_name(kctl, " Capture Source");
2004                 else
2005                         append_ctl_name(kctl, " Playback Source");
2006         }
2007 
2008         snd_printdd(KERN_INFO "[%d] SU [%s] items = %d\n",
2009                     cval->id, kctl->id.name, desc->bNrInPins);
2010         if ((err = snd_usb_mixer_add_control(state->mixer, kctl)) < 0)
2011                 return err;
2012 
2013         return 0;
2014 }
2015 
2016 
2017 /*
2018  * parse an audio unit recursively
2019  */
2020 
2021 static int parse_audio_unit(struct mixer_build *state, int unitid)
2022 {
2023         unsigned char *p1;
2024 
2025         if (test_and_set_bit(unitid, state->unitbitmap))
2026                 return 0; /* the unit already visited */
2027 
2028         p1 = find_audio_control_unit(state, unitid);
2029         if (!p1) {
2030                 snd_printk(KERN_ERR "usbaudio: unit %d not found!\n", unitid);
2031                 return -EINVAL;
2032         }
2033 
2034         switch (p1[2]) {
2035         case UAC_INPUT_TERMINAL:
2036         case UAC2_CLOCK_SOURCE:
2037                 return 0; /* NOP */
2038         case UAC_MIXER_UNIT:
2039                 return parse_audio_mixer_unit(state, unitid, p1);
2040         case UAC_SELECTOR_UNIT:
2041         case UAC2_CLOCK_SELECTOR:
2042                 return parse_audio_selector_unit(state, unitid, p1);
2043         case UAC_FEATURE_UNIT:
2044                 return parse_audio_feature_unit(state, unitid, p1);
2045         case UAC1_PROCESSING_UNIT:
2046         /*   UAC2_EFFECT_UNIT has the same value */
2047                 if (state->mixer->protocol == UAC_VERSION_1)
2048                         return parse_audio_processing_unit(state, unitid, p1);
2049                 else
2050                         return 0; /* FIXME - effect units not implemented yet */
2051         case UAC1_EXTENSION_UNIT:
2052         /*   UAC2_PROCESSING_UNIT_V2 has the same value */
2053                 if (state->mixer->protocol == UAC_VERSION_1)
2054                         return parse_audio_extension_unit(state, unitid, p1);
2055                 else /* UAC_VERSION_2 */
2056                         return parse_audio_processing_unit(state, unitid, p1);
2057         case UAC2_EXTENSION_UNIT_V2:
2058                 return parse_audio_extension_unit(state, unitid, p1);
2059         default:
2060                 snd_printk(KERN_ERR "usbaudio: unit %u: unexpected type 0x%02x\n", unitid, p1[2]);
2061                 return -EINVAL;
2062         }
2063 }
2064 
2065 static void snd_usb_mixer_free(struct usb_mixer_interface *mixer)
2066 {
2067         kfree(mixer->id_elems);
2068         if (mixer->urb) {
2069                 kfree(mixer->urb->transfer_buffer);
2070                 usb_free_urb(mixer->urb);
2071         }
2072         usb_free_urb(mixer->rc_urb);
2073         kfree(mixer->rc_setup_packet);
2074         kfree(mixer);
2075 }
2076 
2077 static int snd_usb_mixer_dev_free(struct snd_device *device)
2078 {
2079         struct usb_mixer_interface *mixer = device->device_data;
2080         snd_usb_mixer_free(mixer);
2081         return 0;
2082 }
2083 
2084 /*
2085  * create mixer controls
2086  *
2087  * walk through all UAC_OUTPUT_TERMINAL descriptors to search for mixers
2088  */
2089 static int snd_usb_mixer_controls(struct usb_mixer_interface *mixer)
2090 {
2091         struct mixer_build state;
2092         int err;
2093         const struct usbmix_ctl_map *map;
2094         void *p;
2095 
2096         memset(&state, 0, sizeof(state));
2097         state.chip = mixer->chip;
2098         state.mixer = mixer;
2099         state.buffer = mixer->hostif->extra;
2100         state.buflen = mixer->hostif->extralen;
2101 
2102         /* check the mapping table */
2103         for (map = usbmix_ctl_maps; map->id; map++) {
2104                 if (map->id == state.chip->usb_id) {
2105                         state.map = map->map;
2106                         state.selector_map = map->selector_map;
2107                         mixer->ignore_ctl_error = map->ignore_ctl_error;
2108                         break;
2109                 }
2110         }
2111 
2112         p = NULL;
2113         while ((p = snd_usb_find_csint_desc(mixer->hostif->extra, mixer->hostif->extralen,
2114                                             p, UAC_OUTPUT_TERMINAL)) != NULL) {
2115                 if (mixer->protocol == UAC_VERSION_1) {
2116                         struct uac1_output_terminal_descriptor *desc = p;
2117 
2118                         if (desc->bLength < sizeof(*desc))
2119                                 continue; /* invalid descriptor? */
2120                         set_bit(desc->bTerminalID, state.unitbitmap);  /* mark terminal ID as visited */
2121                         state.oterm.id = desc->bTerminalID;
2122                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
2123                         state.oterm.name = desc->iTerminal;
2124                         err = parse_audio_unit(&state, desc->bSourceID);
2125                         if (err < 0 && err != -EINVAL)
2126                                 return err;
2127                 } else { /* UAC_VERSION_2 */
2128                         struct uac2_output_terminal_descriptor *desc = p;
2129 
2130                         if (desc->bLength < sizeof(*desc))
2131                                 continue; /* invalid descriptor? */
2132                         set_bit(desc->bTerminalID, state.unitbitmap);  /* mark terminal ID as visited */
2133                         state.oterm.id = desc->bTerminalID;
2134                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
2135                         state.oterm.name = desc->iTerminal;
2136                         err = parse_audio_unit(&state, desc->bSourceID);
2137                         if (err < 0 && err != -EINVAL)
2138                                 return err;
2139 
2140                         /* for UAC2, use the same approach to also add the clock selectors */
2141                         err = parse_audio_unit(&state, desc->bCSourceID);
2142                         if (err < 0 && err != -EINVAL)
2143                                 return err;
2144                 }
2145         }
2146 
2147         return 0;
2148 }
2149 
2150 void snd_usb_mixer_notify_id(struct usb_mixer_interface *mixer, int unitid)
2151 {
2152         struct usb_mixer_elem_info *info;
2153 
2154         for (info = mixer->id_elems[unitid]; info; info = info->next_id_elem)
2155                 snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
2156                                info->elem_id);
2157 }
2158 
2159 static void snd_usb_mixer_dump_cval(struct snd_info_buffer *buffer,
2160                                     int unitid,
2161                                     struct usb_mixer_elem_info *cval)
2162 {
2163         static char *val_types[] = {"BOOLEAN", "INV_BOOLEAN",
2164                                     "S8", "U8", "S16", "U16"};
2165         snd_iprintf(buffer, "  Unit: %i\n", unitid);
2166         if (cval->elem_id)
2167                 snd_iprintf(buffer, "    Control: name=\"%s\", index=%i\n",
2168                                 cval->elem_id->name, cval->elem_id->index);
2169         snd_iprintf(buffer, "    Info: id=%i, control=%i, cmask=0x%x, "
2170                             "channels=%i, type=\"%s\"\n", cval->id,
2171                             cval->control, cval->cmask, cval->channels,
2172                             val_types[cval->val_type]);
2173         snd_iprintf(buffer, "    Volume: min=%i, max=%i, dBmin=%i, dBmax=%i\n",
2174                             cval->min, cval->max, cval->dBmin, cval->dBmax);
2175 }
2176 
2177 static void snd_usb_mixer_proc_read(struct snd_info_entry *entry,
2178                                     struct snd_info_buffer *buffer)
2179 {
2180         struct snd_usb_audio *chip = entry->private_data;
2181         struct usb_mixer_interface *mixer;
2182         struct usb_mixer_elem_info *cval;
2183         int unitid;
2184 
2185         list_for_each_entry(mixer, &chip->mixer_list, list) {
2186                 snd_iprintf(buffer,
2187                         "USB Mixer: usb_id=0x%08x, ctrlif=%i, ctlerr=%i\n",
2188                                 chip->usb_id, snd_usb_ctrl_intf(chip),
2189                                 mixer->ignore_ctl_error);
2190                 snd_iprintf(buffer, "Card: %s\n", chip->card->longname);
2191                 for (unitid = 0; unitid < MAX_ID_ELEMS; unitid++) {
2192                         for (cval = mixer->id_elems[unitid]; cval;
2193                                                 cval = cval->next_id_elem)
2194                                 snd_usb_mixer_dump_cval(buffer, unitid, cval);
2195                 }
2196         }
2197 }
2198 
2199 static void snd_usb_mixer_interrupt_v2(struct usb_mixer_interface *mixer,
2200                                        int attribute, int value, int index)
2201 {
2202         struct usb_mixer_elem_info *info;
2203         __u8 unitid = (index >> 8) & 0xff;
2204         __u8 control = (value >> 8) & 0xff;
2205         __u8 channel = value & 0xff;
2206 
2207         if (channel >= MAX_CHANNELS) {
2208                 snd_printk(KERN_DEBUG "%s(): bogus channel number %d\n",
2209                                 __func__, channel);
2210                 return;
2211         }
2212 
2213         for (info = mixer->id_elems[unitid]; info; info = info->next_id_elem) {
2214                 if (info->control != control)
2215                         continue;
2216 
2217                 switch (attribute) {
2218                 case UAC2_CS_CUR:
2219                         /* invalidate cache, so the value is read from the device */
2220                         if (channel)
2221                                 info->cached &= ~(1 << channel);
2222                         else /* master channel */
2223                                 info->cached = 0;
2224 
2225                         snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
2226                                         info->elem_id);
2227                         break;
2228 
2229                 case UAC2_CS_RANGE:
2230                         /* TODO */
2231                         break;
2232 
2233                 case UAC2_CS_MEM:
2234                         /* TODO */
2235                         break;
2236 
2237                 default:
2238                         snd_printk(KERN_DEBUG "unknown attribute %d in interrupt\n",
2239                                                 attribute);
2240                         break;
2241                 } /* switch */
2242         }
2243 }
2244 
2245 static void snd_usb_mixer_interrupt(struct urb *urb)
2246 {
2247         struct usb_mixer_interface *mixer = urb->context;
2248         int len = urb->actual_length;
2249         int ustatus = urb->status;
2250 
2251         if (ustatus != 0)
2252                 goto requeue;
2253 
2254         if (mixer->protocol == UAC_VERSION_1) {
2255                 struct uac1_status_word *status;
2256 
2257                 for (status = urb->transfer_buffer;
2258                      len >= sizeof(*status);
2259                      len -= sizeof(*status), status++) {
2260                         snd_printd(KERN_DEBUG "status interrupt: %02x %02x\n",
2261                                                 status->bStatusType,
2262                                                 status->bOriginator);
2263 
2264                         /* ignore any notifications not from the control interface */
2265                         if ((status->bStatusType & UAC1_STATUS_TYPE_ORIG_MASK) !=
2266                                 UAC1_STATUS_TYPE_ORIG_AUDIO_CONTROL_IF)
2267                                 continue;
2268 
2269                         if (status->bStatusType & UAC1_STATUS_TYPE_MEM_CHANGED)
2270                                 snd_usb_mixer_rc_memory_change(mixer, status->bOriginator);
2271                         else
2272                                 snd_usb_mixer_notify_id(mixer, status->bOriginator);
2273                 }
2274         } else { /* UAC_VERSION_2 */
2275                 struct uac2_interrupt_data_msg *msg;
2276 
2277                 for (msg = urb->transfer_buffer;
2278                      len >= sizeof(*msg);
2279                      len -= sizeof(*msg), msg++) {
2280                         /* drop vendor specific and endpoint requests */
2281                         if ((msg->bInfo & UAC2_INTERRUPT_DATA_MSG_VENDOR) ||
2282                             (msg->bInfo & UAC2_INTERRUPT_DATA_MSG_EP))
2283                                 continue;
2284 
2285                         snd_usb_mixer_interrupt_v2(mixer, msg->bAttribute,
2286                                                    le16_to_cpu(msg->wValue),
2287                                                    le16_to_cpu(msg->wIndex));
2288                 }
2289         }
2290 
2291 requeue:
2292         if (ustatus != -ENOENT && ustatus != -ECONNRESET && ustatus != -ESHUTDOWN) {
2293                 urb->dev = mixer->chip->dev;
2294                 usb_submit_urb(urb, GFP_ATOMIC);
2295         }
2296 }
2297 
2298 /* stop any bus activity of a mixer */
2299 void snd_usb_mixer_inactivate(struct usb_mixer_interface *mixer)
2300 {
2301         usb_kill_urb(mixer->urb);
2302         usb_kill_urb(mixer->rc_urb);
2303 }
2304 
2305 int snd_usb_mixer_activate(struct usb_mixer_interface *mixer)
2306 {
2307         int err;
2308 
2309         if (mixer->urb) {
2310                 err = usb_submit_urb(mixer->urb, GFP_NOIO);
2311                 if (err < 0)
2312                         return err;
2313         }
2314 
2315         return 0;
2316 }
2317 
2318 /* create the handler for the optional status interrupt endpoint */
2319 static int snd_usb_mixer_status_create(struct usb_mixer_interface *mixer)
2320 {
2321         struct usb_endpoint_descriptor *ep;
2322         void *transfer_buffer;
2323         int buffer_length;
2324         unsigned int epnum;
2325 
2326         /* we need one interrupt input endpoint */
2327         if (get_iface_desc(mixer->hostif)->bNumEndpoints < 1)
2328                 return 0;
2329         ep = get_endpoint(mixer->hostif, 0);
2330         if (!usb_endpoint_dir_in(ep) || !usb_endpoint_xfer_int(ep))
2331                 return 0;
2332 
2333         epnum = usb_endpoint_num(ep);
2334         buffer_length = le16_to_cpu(ep->wMaxPacketSize);
2335         transfer_buffer = kmalloc(buffer_length, GFP_KERNEL);
2336         if (!transfer_buffer)
2337                 return -ENOMEM;
2338         mixer->urb = usb_alloc_urb(0, GFP_KERNEL);
2339         if (!mixer->urb) {
2340                 kfree(transfer_buffer);
2341                 return -ENOMEM;
2342         }
2343         usb_fill_int_urb(mixer->urb, mixer->chip->dev,
2344                          usb_rcvintpipe(mixer->chip->dev, epnum),
2345                          transfer_buffer, buffer_length,
2346                          snd_usb_mixer_interrupt, mixer, ep->bInterval);
2347         usb_submit_urb(mixer->urb, GFP_KERNEL);
2348         return 0;
2349 }
2350 
2351 int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif,
2352                          int ignore_error)
2353 {
2354         static struct snd_device_ops dev_ops = {
2355                 .dev_free = snd_usb_mixer_dev_free
2356         };
2357         struct usb_mixer_interface *mixer;
2358         struct snd_info_entry *entry;
2359         int err;
2360 
2361         strcpy(chip->card->mixername, "USB Mixer");
2362 
2363         mixer = kzalloc(sizeof(*mixer), GFP_KERNEL);
2364         if (!mixer)
2365                 return -ENOMEM;
2366         mixer->chip = chip;
2367         mixer->ignore_ctl_error = ignore_error;
2368         mixer->id_elems = kcalloc(MAX_ID_ELEMS, sizeof(*mixer->id_elems),
2369                                   GFP_KERNEL);
2370         if (!mixer->id_elems) {
2371                 kfree(mixer);
2372                 return -ENOMEM;
2373         }
2374 
2375         mixer->hostif = &usb_ifnum_to_if(chip->dev, ctrlif)->altsetting[0];
2376         switch (get_iface_desc(mixer->hostif)->bInterfaceProtocol) {
2377         case UAC_VERSION_1:
2378         default:
2379                 mixer->protocol = UAC_VERSION_1;
2380                 break;
2381         case UAC_VERSION_2:
2382                 mixer->protocol = UAC_VERSION_2;
2383                 break;
2384         }
2385 
2386         if ((err = snd_usb_mixer_controls(mixer)) < 0 ||
2387             (err = snd_usb_mixer_status_create(mixer)) < 0)
2388                 goto _error;
2389 
2390         snd_usb_mixer_apply_create_quirk(mixer);
2391 
2392         err = snd_device_new(chip->card, SNDRV_DEV_LOWLEVEL, mixer, &dev_ops);
2393         if (err < 0)
2394                 goto _error;
2395 
2396         if (list_empty(&chip->mixer_list) &&
2397             !snd_card_proc_new(chip->card, "usbmixer", &entry))
2398                 snd_info_set_text_ops(entry, chip, snd_usb_mixer_proc_read);
2399 
2400         list_add(&mixer->list, &chip->mixer_list);
2401         return 0;
2402 
2403 _error:
2404         snd_usb_mixer_free(mixer);
2405         return err;
2406 }
2407 
2408 void snd_usb_mixer_disconnect(struct list_head *p)
2409 {
2410         struct usb_mixer_interface *mixer;
2411 
2412         mixer = list_entry(p, struct usb_mixer_interface, list);
2413         usb_kill_urb(mixer->urb);
2414         usb_kill_urb(mixer->rc_urb);
2415 }
2416 

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