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HID: hiddev: Fix slab-out-of-bounds write in hiddev_ioctl_usage()
[linux/fpc-iii.git] / sound / usb / mixer.c
blob9b9d653d5e90b0e584bc27b78a939646e53a0356
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 DECLARE_BITMAP(termbitmap, MAX_ID_ELEMS);
85 struct usb_audio_term oterm;
86 const struct usbmix_name_map *map;
87 const struct usbmix_selector_map *selector_map;
88 };
89
90 /*E-mu 0202/0404/0204 eXtension Unit(XU) control*/
91 enum {
92 USB_XU_CLOCK_RATE = 0xe301,
93 USB_XU_CLOCK_SOURCE = 0xe302,
94 USB_XU_DIGITAL_IO_STATUS = 0xe303,
95 USB_XU_DEVICE_OPTIONS = 0xe304,
96 USB_XU_DIRECT_MONITORING = 0xe305,
97 USB_XU_METERING = 0xe306
98 };
99 enum {
100 USB_XU_CLOCK_SOURCE_SELECTOR = 0x02, /* clock source*/
101 USB_XU_CLOCK_RATE_SELECTOR = 0x03, /* clock rate */
102 USB_XU_DIGITAL_FORMAT_SELECTOR = 0x01, /* the spdif format */
103 USB_XU_SOFT_LIMIT_SELECTOR = 0x03 /* soft limiter */
104 };
105
106 /*
107 * manual mapping of mixer names
108 * if the mixer topology is too complicated and the parsed names are
109 * ambiguous, add the entries in usbmixer_maps.c.
110 */
111 #include "mixer_maps.c"
112
113 static const struct usbmix_name_map *
114 find_map(struct mixer_build *state, int unitid, int control)
115 {
116 const struct usbmix_name_map *p = state->map;
117
118 if (!p)
119 return NULL;
120
121 for (p = state->map; p->id; p++) {
122 if (p->id == unitid &&
123 (!control || !p->control || control == p->control))
124 return p;
125 }
126 return NULL;
127 }
128
129 /* get the mapped name if the unit matches */
130 static int
131 check_mapped_name(const struct usbmix_name_map *p, char *buf, int buflen)
132 {
133 if (!p || !p->name)
134 return 0;
135
136 buflen--;
137 return strlcpy(buf, p->name, buflen);
138 }
139
140 /* ignore the error value if ignore_ctl_error flag is set */
141 #define filter_error(cval, err) \
142 ((cval)->head.mixer->ignore_ctl_error ? 0 : (err))
143
144 /* check whether the control should be ignored */
145 static inline int
146 check_ignored_ctl(const struct usbmix_name_map *p)
147 {
148 if (!p || p->name || p->dB)
149 return 0;
150 return 1;
151 }
152
153 /* dB mapping */
154 static inline void check_mapped_dB(const struct usbmix_name_map *p,
155 struct usb_mixer_elem_info *cval)
156 {
157 if (p && p->dB) {
158 cval->dBmin = p->dB->min;
159 cval->dBmax = p->dB->max;
160 cval->initialized = 1;
161 }
162 }
163
164 /* get the mapped selector source name */
165 static int check_mapped_selector_name(struct mixer_build *state, int unitid,
166 int index, char *buf, int buflen)
167 {
168 const struct usbmix_selector_map *p;
169
170 if (!state->selector_map)
171 return 0;
172 for (p = state->selector_map; p->id; p++) {
173 if (p->id == unitid && index < p->count)
174 return strlcpy(buf, p->names[index], buflen);
175 }
176 return 0;
177 }
178
179 /*
180 * find an audio control unit with the given unit id
181 */
182 static void *find_audio_control_unit(struct mixer_build *state,
183 unsigned char unit)
184 {
185 /* we just parse the header */
186 struct uac_feature_unit_descriptor *hdr = NULL;
187
188 while ((hdr = snd_usb_find_desc(state->buffer, state->buflen, hdr,
189 USB_DT_CS_INTERFACE)) != NULL) {
190 if (hdr->bLength >= 4 &&
191 hdr->bDescriptorSubtype >= UAC_INPUT_TERMINAL &&
192 hdr->bDescriptorSubtype <= UAC2_SAMPLE_RATE_CONVERTER &&
193 hdr->bUnitID == unit)
194 return hdr;
195 }
196
197 return NULL;
198 }
199
200 /*
201 * copy a string with the given id
202 */
203 static int snd_usb_copy_string_desc(struct mixer_build *state,
204 int index, char *buf, int maxlen)
205 {
206 int len = usb_string(state->chip->dev, index, buf, maxlen - 1);
207
208 if (len < 0)
209 return 0;
210
211 buf[len] = 0;
212 return len;
213 }
214
215 /*
216 * convert from the byte/word on usb descriptor to the zero-based integer
217 */
218 static int convert_signed_value(struct usb_mixer_elem_info *cval, int val)
219 {
220 switch (cval->val_type) {
221 case USB_MIXER_BOOLEAN:
222 return !!val;
223 case USB_MIXER_INV_BOOLEAN:
224 return !val;
225 case USB_MIXER_U8:
226 val &= 0xff;
227 break;
228 case USB_MIXER_S8:
229 val &= 0xff;
230 if (val >= 0x80)
231 val -= 0x100;
232 break;
233 case USB_MIXER_U16:
234 val &= 0xffff;
235 break;
236 case USB_MIXER_S16:
237 val &= 0xffff;
238 if (val >= 0x8000)
239 val -= 0x10000;
240 break;
241 }
242 return val;
243 }
244
245 /*
246 * convert from the zero-based int to the byte/word for usb descriptor
247 */
248 static int convert_bytes_value(struct usb_mixer_elem_info *cval, int val)
249 {
250 switch (cval->val_type) {
251 case USB_MIXER_BOOLEAN:
252 return !!val;
253 case USB_MIXER_INV_BOOLEAN:
254 return !val;
255 case USB_MIXER_S8:
256 case USB_MIXER_U8:
257 return val & 0xff;
258 case USB_MIXER_S16:
259 case USB_MIXER_U16:
260 return val & 0xffff;
261 }
262 return 0; /* not reached */
263 }
264
265 static int get_relative_value(struct usb_mixer_elem_info *cval, int val)
266 {
267 if (!cval->res)
268 cval->res = 1;
269 if (val < cval->min)
270 return 0;
271 else if (val >= cval->max)
272 return (cval->max - cval->min + cval->res - 1) / cval->res;
273 else
274 return (val - cval->min) / cval->res;
275 }
276
277 static int get_abs_value(struct usb_mixer_elem_info *cval, int val)
278 {
279 if (val < 0)
280 return cval->min;
281 if (!cval->res)
282 cval->res = 1;
283 val *= cval->res;
284 val += cval->min;
285 if (val > cval->max)
286 return cval->max;
287 return val;
288 }
289
290 static int uac2_ctl_value_size(int val_type)
291 {
292 switch (val_type) {
293 case USB_MIXER_S32:
294 case USB_MIXER_U32:
295 return 4;
296 case USB_MIXER_S16:
297 case USB_MIXER_U16:
298 return 2;
299 default:
300 return 1;
301 }
302 return 0; /* unreachable */
303 }
304
305
306 /*
307 * retrieve a mixer value
308 */
309
310 static int get_ctl_value_v1(struct usb_mixer_elem_info *cval, int request,
311 int validx, int *value_ret)
312 {
313 struct snd_usb_audio *chip = cval->head.mixer->chip;
314 unsigned char buf[2];
315 int val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
316 int timeout = 10;
317 int idx = 0, err;
318
319 err = snd_usb_lock_shutdown(chip);
320 if (err < 0)
321 return -EIO;
322
323 while (timeout-- > 0) {
324 idx = snd_usb_ctrl_intf(chip) | (cval->head.id << 8);
325 if (snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), request,
326 USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
327 validx, idx, buf, val_len) >= val_len) {
328 *value_ret = convert_signed_value(cval, snd_usb_combine_bytes(buf, val_len));
329 err = 0;
330 goto out;
331 }
332 }
333 usb_audio_dbg(chip,
334 "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
335 request, validx, idx, cval->val_type);
336 err = -EINVAL;
337
338 out:
339 snd_usb_unlock_shutdown(chip);
340 return err;
341 }
342
343 static int get_ctl_value_v2(struct usb_mixer_elem_info *cval, int request,
344 int validx, int *value_ret)
345 {
346 struct snd_usb_audio *chip = cval->head.mixer->chip;
347 /* enough space for one range */
348 unsigned char buf[sizeof(__u16) + 3 * sizeof(__u32)];
349 unsigned char *val;
350 int idx = 0, ret, val_size, size;
351 __u8 bRequest;
352
353 val_size = uac2_ctl_value_size(cval->val_type);
354
355 if (request == UAC_GET_CUR) {
356 bRequest = UAC2_CS_CUR;
357 size = val_size;
358 } else {
359 bRequest = UAC2_CS_RANGE;
360 size = sizeof(__u16) + 3 * val_size;
361 }
362
363 memset(buf, 0, sizeof(buf));
364
365 ret = snd_usb_lock_shutdown(chip) ? -EIO : 0;
366 if (ret)
367 goto error;
368
369 idx = snd_usb_ctrl_intf(chip) | (cval->head.id << 8);
370 ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), bRequest,
371 USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
372 validx, idx, buf, size);
373 snd_usb_unlock_shutdown(chip);
374
375 if (ret < 0) {
376 error:
377 usb_audio_err(chip,
378 "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
379 request, validx, idx, cval->val_type);
380 return ret;
381 }
382
383 /* FIXME: how should we handle multiple triplets here? */
384
385 switch (request) {
386 case UAC_GET_CUR:
387 val = buf;
388 break;
389 case UAC_GET_MIN:
390 val = buf + sizeof(__u16);
391 break;
392 case UAC_GET_MAX:
393 val = buf + sizeof(__u16) + val_size;
394 break;
395 case UAC_GET_RES:
396 val = buf + sizeof(__u16) + val_size * 2;
397 break;
398 default:
399 return -EINVAL;
400 }
401
402 *value_ret = convert_signed_value(cval,
403 snd_usb_combine_bytes(val, val_size));
404
405 return 0;
406 }
407
408 static int get_ctl_value(struct usb_mixer_elem_info *cval, int request,
409 int validx, int *value_ret)
410 {
411 validx += cval->idx_off;
412
413 return (cval->head.mixer->protocol == UAC_VERSION_1) ?
414 get_ctl_value_v1(cval, request, validx, value_ret) :
415 get_ctl_value_v2(cval, request, validx, value_ret);
416 }
417
418 static int get_cur_ctl_value(struct usb_mixer_elem_info *cval,
419 int validx, int *value)
420 {
421 return get_ctl_value(cval, UAC_GET_CUR, validx, value);
422 }
423
424 /* channel = 0: master, 1 = first channel */
425 static inline int get_cur_mix_raw(struct usb_mixer_elem_info *cval,
426 int channel, int *value)
427 {
428 return get_ctl_value(cval, UAC_GET_CUR,
429 (cval->control << 8) | channel,
430 value);
431 }
432
433 int snd_usb_get_cur_mix_value(struct usb_mixer_elem_info *cval,
434 int channel, int index, int *value)
435 {
436 int err;
437
438 if (cval->cached & (1 << channel)) {
439 *value = cval->cache_val[index];
440 return 0;
441 }
442 err = get_cur_mix_raw(cval, channel, value);
443 if (err < 0) {
444 if (!cval->head.mixer->ignore_ctl_error)
445 usb_audio_dbg(cval->head.mixer->chip,
446 "cannot get current value for control %d ch %d: err = %d\n",
447 cval->control, channel, err);
448 return err;
449 }
450 cval->cached |= 1 << channel;
451 cval->cache_val[index] = *value;
452 return 0;
453 }
454
455 /*
456 * set a mixer value
457 */
458
459 int snd_usb_mixer_set_ctl_value(struct usb_mixer_elem_info *cval,
460 int request, int validx, int value_set)
461 {
462 struct snd_usb_audio *chip = cval->head.mixer->chip;
463 unsigned char buf[4];
464 int idx = 0, val_len, err, timeout = 10;
465
466 validx += cval->idx_off;
467
468 if (cval->head.mixer->protocol == UAC_VERSION_1) {
469 val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
470 } else { /* UAC_VERSION_2 */
471 val_len = uac2_ctl_value_size(cval->val_type);
472
473 /* FIXME */
474 if (request != UAC_SET_CUR) {
475 usb_audio_dbg(chip, "RANGE setting not yet supported\n");
476 return -EINVAL;
477 }
478
479 request = UAC2_CS_CUR;
480 }
481
482 value_set = convert_bytes_value(cval, value_set);
483 buf[0] = value_set & 0xff;
484 buf[1] = (value_set >> 8) & 0xff;
485 buf[2] = (value_set >> 16) & 0xff;
486 buf[3] = (value_set >> 24) & 0xff;
487
488 err = snd_usb_lock_shutdown(chip);
489 if (err < 0)
490 return -EIO;
491
492 while (timeout-- > 0) {
493 idx = snd_usb_ctrl_intf(chip) | (cval->head.id << 8);
494 if (snd_usb_ctl_msg(chip->dev,
495 usb_sndctrlpipe(chip->dev, 0), request,
496 USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
497 validx, idx, buf, val_len) >= 0) {
498 err = 0;
499 goto out;
500 }
501 }
502 usb_audio_dbg(chip, "cannot set ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d, data = %#x/%#x\n",
503 request, validx, idx, cval->val_type, buf[0], buf[1]);
504 err = -EINVAL;
505
506 out:
507 snd_usb_unlock_shutdown(chip);
508 return err;
509 }
510
511 static int set_cur_ctl_value(struct usb_mixer_elem_info *cval,
512 int validx, int value)
513 {
514 return snd_usb_mixer_set_ctl_value(cval, UAC_SET_CUR, validx, value);
515 }
516
517 int snd_usb_set_cur_mix_value(struct usb_mixer_elem_info *cval, int channel,
518 int index, int value)
519 {
520 int err;
521 unsigned int read_only = (channel == 0) ?
522 cval->master_readonly :
523 cval->ch_readonly & (1 << (channel - 1));
524
525 if (read_only) {
526 usb_audio_dbg(cval->head.mixer->chip,
527 "%s(): channel %d of control %d is read_only\n",
528 __func__, channel, cval->control);
529 return 0;
530 }
531
532 err = snd_usb_mixer_set_ctl_value(cval,
533 UAC_SET_CUR, (cval->control << 8) | channel,
534 value);
535 if (err < 0)
536 return err;
537 cval->cached |= 1 << channel;
538 cval->cache_val[index] = value;
539 return 0;
540 }
541
542 /*
543 * TLV callback for mixer volume controls
544 */
545 int snd_usb_mixer_vol_tlv(struct snd_kcontrol *kcontrol, int op_flag,
546 unsigned int size, unsigned int __user *_tlv)
547 {
548 struct usb_mixer_elem_info *cval = kcontrol->private_data;
549 DECLARE_TLV_DB_MINMAX(scale, 0, 0);
550
551 if (size < sizeof(scale))
552 return -ENOMEM;
553 if (cval->min_mute)
554 scale[0] = SNDRV_CTL_TLVT_DB_MINMAX_MUTE;
555 scale[2] = cval->dBmin;
556 scale[3] = cval->dBmax;
557 if (copy_to_user(_tlv, scale, sizeof(scale)))
558 return -EFAULT;
559 return 0;
560 }
561
562 /*
563 * parser routines begin here...
564 */
565
566 static int parse_audio_unit(struct mixer_build *state, int unitid);
567
568
569 /*
570 * check if the input/output channel routing is enabled on the given bitmap.
571 * used for mixer unit parser
572 */
573 static int check_matrix_bitmap(unsigned char *bmap,
574 int ich, int och, int num_outs)
575 {
576 int idx = ich * num_outs + och;
577 return bmap[idx >> 3] & (0x80 >> (idx & 7));
578 }
579
580 /*
581 * add an alsa control element
582 * search and increment the index until an empty slot is found.
583 *
584 * if failed, give up and free the control instance.
585 */
586
587 int snd_usb_mixer_add_list(struct usb_mixer_elem_list *list,
588 struct snd_kcontrol *kctl,
589 bool is_std_info)
590 {
591 struct usb_mixer_interface *mixer = list->mixer;
592 int err;
593
594 while (snd_ctl_find_id(mixer->chip->card, &kctl->id))
595 kctl->id.index++;
596 if ((err = snd_ctl_add(mixer->chip->card, kctl)) < 0) {
597 usb_audio_dbg(mixer->chip, "cannot add control (err = %d)\n",
598 err);
599 return err;
600 }
601 list->kctl = kctl;
602 list->is_std_info = is_std_info;
603 list->next_id_elem = mixer->id_elems[list->id];
604 mixer->id_elems[list->id] = list;
605 return 0;
606 }
607
608 /*
609 * get a terminal name string
610 */
611
612 static struct iterm_name_combo {
613 int type;
614 char *name;
615 } iterm_names[] = {
616 { 0x0300, "Output" },
617 { 0x0301, "Speaker" },
618 { 0x0302, "Headphone" },
619 { 0x0303, "HMD Audio" },
620 { 0x0304, "Desktop Speaker" },
621 { 0x0305, "Room Speaker" },
622 { 0x0306, "Com Speaker" },
623 { 0x0307, "LFE" },
624 { 0x0600, "External In" },
625 { 0x0601, "Analog In" },
626 { 0x0602, "Digital In" },
627 { 0x0603, "Line" },
628 { 0x0604, "Legacy In" },
629 { 0x0605, "IEC958 In" },
630 { 0x0606, "1394 DA Stream" },
631 { 0x0607, "1394 DV Stream" },
632 { 0x0700, "Embedded" },
633 { 0x0701, "Noise Source" },
634 { 0x0702, "Equalization Noise" },
635 { 0x0703, "CD" },
636 { 0x0704, "DAT" },
637 { 0x0705, "DCC" },
638 { 0x0706, "MiniDisk" },
639 { 0x0707, "Analog Tape" },
640 { 0x0708, "Phonograph" },
641 { 0x0709, "VCR Audio" },
642 { 0x070a, "Video Disk Audio" },
643 { 0x070b, "DVD Audio" },
644 { 0x070c, "TV Tuner Audio" },
645 { 0x070d, "Satellite Rec Audio" },
646 { 0x070e, "Cable Tuner Audio" },
647 { 0x070f, "DSS Audio" },
648 { 0x0710, "Radio Receiver" },
649 { 0x0711, "Radio Transmitter" },
650 { 0x0712, "Multi-Track Recorder" },
651 { 0x0713, "Synthesizer" },
652 { 0 },
653 };
654
655 static int get_term_name(struct mixer_build *state, struct usb_audio_term *iterm,
656 unsigned char *name, int maxlen, int term_only)
657 {
658 struct iterm_name_combo *names;
659
660 if (iterm->name)
661 return snd_usb_copy_string_desc(state, iterm->name,
662 name, maxlen);
663
664 /* virtual type - not a real terminal */
665 if (iterm->type >> 16) {
666 if (term_only)
667 return 0;
668 switch (iterm->type >> 16) {
669 case UAC_SELECTOR_UNIT:
670 strcpy(name, "Selector");
671 return 8;
672 case UAC1_PROCESSING_UNIT:
673 strcpy(name, "Process Unit");
674 return 12;
675 case UAC1_EXTENSION_UNIT:
676 strcpy(name, "Ext Unit");
677 return 8;
678 case UAC_MIXER_UNIT:
679 strcpy(name, "Mixer");
680 return 5;
681 default:
682 return sprintf(name, "Unit %d", iterm->id);
683 }
684 }
685
686 switch (iterm->type & 0xff00) {
687 case 0x0100:
688 strcpy(name, "PCM");
689 return 3;
690 case 0x0200:
691 strcpy(name, "Mic");
692 return 3;
693 case 0x0400:
694 strcpy(name, "Headset");
695 return 7;
696 case 0x0500:
697 strcpy(name, "Phone");
698 return 5;
699 }
700
701 for (names = iterm_names; names->type; names++) {
702 if (names->type == iterm->type) {
703 strcpy(name, names->name);
704 return strlen(names->name);
705 }
706 }
707
708 return 0;
709 }
710
711 /*
712 * parse the source unit recursively until it reaches to a terminal
713 * or a branched unit.
714 */
715 static int __check_input_term(struct mixer_build *state, int id,
716 struct usb_audio_term *term)
717 {
718 int err;
719 void *p1;
720 unsigned char *hdr;
721
722 memset(term, 0, sizeof(*term));
723 for (;;) {
724 /* a loop in the terminal chain? */
725 if (test_and_set_bit(id, state->termbitmap))
726 return -EINVAL;
727
728 p1 = find_audio_control_unit(state, id);
729 if (!p1)
730 break;
731
732 hdr = p1;
733 term->id = id;
734 switch (hdr[2]) {
735 case UAC_INPUT_TERMINAL:
736 if (state->mixer->protocol == UAC_VERSION_1) {
737 struct uac_input_terminal_descriptor *d = p1;
738 term->type = le16_to_cpu(d->wTerminalType);
739 term->channels = d->bNrChannels;
740 term->chconfig = le16_to_cpu(d->wChannelConfig);
741 term->name = d->iTerminal;
742 } else { /* UAC_VERSION_2 */
743 struct uac2_input_terminal_descriptor *d = p1;
744
745 /* call recursively to verify that the
746 * referenced clock entity is valid */
747 err = __check_input_term(state, d->bCSourceID, term);
748 if (err < 0)
749 return err;
750
751 /* save input term properties after recursion,
752 * to ensure they are not overriden by the
753 * recursion calls */
754 term->id = id;
755 term->type = le16_to_cpu(d->wTerminalType);
756 term->channels = d->bNrChannels;
757 term->chconfig = le32_to_cpu(d->bmChannelConfig);
758 term->name = d->iTerminal;
759 }
760 return 0;
761 case UAC_FEATURE_UNIT: {
762 /* the header is the same for v1 and v2 */
763 struct uac_feature_unit_descriptor *d = p1;
764 id = d->bSourceID;
765 break; /* continue to parse */
766 }
767 case UAC_MIXER_UNIT: {
768 struct uac_mixer_unit_descriptor *d = p1;
769 term->type = d->bDescriptorSubtype << 16; /* virtual type */
770 term->channels = uac_mixer_unit_bNrChannels(d);
771 term->chconfig = uac_mixer_unit_wChannelConfig(d, state->mixer->protocol);
772 term->name = uac_mixer_unit_iMixer(d);
773 return 0;
774 }
775 case UAC_SELECTOR_UNIT:
776 case UAC2_CLOCK_SELECTOR: {
777 struct uac_selector_unit_descriptor *d = p1;
778 /* call recursively to retrieve the channel info */
779 err = __check_input_term(state, d->baSourceID[0], term);
780 if (err < 0)
781 return err;
782 term->type = d->bDescriptorSubtype << 16; /* virtual type */
783 term->id = id;
784 term->name = uac_selector_unit_iSelector(d);
785 return 0;
786 }
787 case UAC1_PROCESSING_UNIT:
788 case UAC1_EXTENSION_UNIT:
789 /* UAC2_PROCESSING_UNIT_V2 */
790 /* UAC2_EFFECT_UNIT */
791 case UAC2_EXTENSION_UNIT_V2: {
792 struct uac_processing_unit_descriptor *d = p1;
793
794 if (state->mixer->protocol == UAC_VERSION_2 &&
795 hdr[2] == UAC2_EFFECT_UNIT) {
796 /* UAC2/UAC1 unit IDs overlap here in an
797 * uncompatible way. Ignore this unit for now.
798 */
799 return 0;
800 }
801
802 if (d->bNrInPins) {
803 id = d->baSourceID[0];
804 break; /* continue to parse */
805 }
806 term->type = d->bDescriptorSubtype << 16; /* virtual type */
807 term->channels = uac_processing_unit_bNrChannels(d);
808 term->chconfig = uac_processing_unit_wChannelConfig(d, state->mixer->protocol);
809 term->name = uac_processing_unit_iProcessing(d, state->mixer->protocol);
810 return 0;
811 }
812 case UAC2_CLOCK_SOURCE: {
813 struct uac_clock_source_descriptor *d = p1;
814 term->type = d->bDescriptorSubtype << 16; /* virtual type */
815 term->id = id;
816 term->name = d->iClockSource;
817 return 0;
818 }
819 default:
820 return -ENODEV;
821 }
822 }
823 return -ENODEV;
824 }
825
826
827 static int check_input_term(struct mixer_build *state, int id,
828 struct usb_audio_term *term)
829 {
830 memset(term, 0, sizeof(*term));
831 memset(state->termbitmap, 0, sizeof(state->termbitmap));
832 return __check_input_term(state, id, term);
833 }
834
835 /*
836 * Feature Unit
837 */
838
839 /* feature unit control information */
840 struct usb_feature_control_info {
841 const char *name;
842 int type; /* data type for uac1 */
843 int type_uac2; /* data type for uac2 if different from uac1, else -1 */
844 };
845
846 static struct usb_feature_control_info audio_feature_info[] = {
847 { "Mute", USB_MIXER_INV_BOOLEAN, -1 },
848 { "Volume", USB_MIXER_S16, -1 },
849 { "Tone Control - Bass", USB_MIXER_S8, -1 },
850 { "Tone Control - Mid", USB_MIXER_S8, -1 },
851 { "Tone Control - Treble", USB_MIXER_S8, -1 },
852 { "Graphic Equalizer", USB_MIXER_S8, -1 }, /* FIXME: not implemeted yet */
853 { "Auto Gain Control", USB_MIXER_BOOLEAN, -1 },
854 { "Delay Control", USB_MIXER_U16, USB_MIXER_U32 },
855 { "Bass Boost", USB_MIXER_BOOLEAN, -1 },
856 { "Loudness", USB_MIXER_BOOLEAN, -1 },
857 /* UAC2 specific */
858 { "Input Gain Control", USB_MIXER_S16, -1 },
859 { "Input Gain Pad Control", USB_MIXER_S16, -1 },
860 { "Phase Inverter Control", USB_MIXER_BOOLEAN, -1 },
861 };
862
863 /* private_free callback */
864 void snd_usb_mixer_elem_free(struct snd_kcontrol *kctl)
865 {
866 kfree(kctl->private_data);
867 kctl->private_data = NULL;
868 }
869
870 /*
871 * interface to ALSA control for feature/mixer units
872 */
873
874 /* volume control quirks */
875 static void volume_control_quirks(struct usb_mixer_elem_info *cval,
876 struct snd_kcontrol *kctl)
877 {
878 struct snd_usb_audio *chip = cval->head.mixer->chip;
879 switch (chip->usb_id) {
880 case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
881 case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
882 if (strcmp(kctl->id.name, "Effect Duration") == 0) {
883 cval->min = 0x0000;
884 cval->max = 0xffff;
885 cval->res = 0x00e6;
886 break;
887 }
888 if (strcmp(kctl->id.name, "Effect Volume") == 0 ||
889 strcmp(kctl->id.name, "Effect Feedback Volume") == 0) {
890 cval->min = 0x00;
891 cval->max = 0xff;
892 break;
893 }
894 if (strstr(kctl->id.name, "Effect Return") != NULL) {
895 cval->min = 0xb706;
896 cval->max = 0xff7b;
897 cval->res = 0x0073;
898 break;
899 }
900 if ((strstr(kctl->id.name, "Playback Volume") != NULL) ||
901 (strstr(kctl->id.name, "Effect Send") != NULL)) {
902 cval->min = 0xb5fb; /* -73 dB = 0xb6ff */
903 cval->max = 0xfcfe;
904 cval->res = 0x0073;
905 }
906 break;
907
908 case USB_ID(0x0763, 0x2081): /* M-Audio Fast Track Ultra 8R */
909 case USB_ID(0x0763, 0x2080): /* M-Audio Fast Track Ultra */
910 if (strcmp(kctl->id.name, "Effect Duration") == 0) {
911 usb_audio_info(chip,
912 "set quirk for FTU Effect Duration\n");
913 cval->min = 0x0000;
914 cval->max = 0x7f00;
915 cval->res = 0x0100;
916 break;
917 }
918 if (strcmp(kctl->id.name, "Effect Volume") == 0 ||
919 strcmp(kctl->id.name, "Effect Feedback Volume") == 0) {
920 usb_audio_info(chip,
921 "set quirks for FTU Effect Feedback/Volume\n");
922 cval->min = 0x00;
923 cval->max = 0x7f;
924 break;
925 }
926 break;
927
928 case USB_ID(0x0d8c, 0x0103):
929 if (!strcmp(kctl->id.name, "PCM Playback Volume")) {
930 usb_audio_info(chip,
931 "set volume quirk for CM102-A+/102S+\n");
932 cval->min = -256;
933 }
934 break;
935
936 case USB_ID(0x0471, 0x0101):
937 case USB_ID(0x0471, 0x0104):
938 case USB_ID(0x0471, 0x0105):
939 case USB_ID(0x0672, 0x1041):
940 /* quirk for UDA1321/N101.
941 * note that detection between firmware 2.1.1.7 (N101)
942 * and later 2.1.1.21 is not very clear from datasheets.
943 * I hope that the min value is -15360 for newer firmware --jk
944 */
945 if (!strcmp(kctl->id.name, "PCM Playback Volume") &&
946 cval->min == -15616) {
947 usb_audio_info(chip,
948 "set volume quirk for UDA1321/N101 chip\n");
949 cval->max = -256;
950 }
951 break;
952
953 case USB_ID(0x046d, 0x09a4):
954 if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
955 usb_audio_info(chip,
956 "set volume quirk for QuickCam E3500\n");
957 cval->min = 6080;
958 cval->max = 8768;
959 cval->res = 192;
960 }
961 break;
962
963 case USB_ID(0x046d, 0x0807): /* Logitech Webcam C500 */
964 case USB_ID(0x046d, 0x0808):
965 case USB_ID(0x046d, 0x0809):
966 case USB_ID(0x046d, 0x0819): /* Logitech Webcam C210 */
967 case USB_ID(0x046d, 0x081b): /* HD Webcam c310 */
968 case USB_ID(0x046d, 0x081d): /* HD Webcam c510 */
969 case USB_ID(0x046d, 0x0825): /* HD Webcam c270 */
970 case USB_ID(0x046d, 0x0826): /* HD Webcam c525 */
971 case USB_ID(0x046d, 0x08ca): /* Logitech Quickcam Fusion */
972 case USB_ID(0x046d, 0x0991):
973 case USB_ID(0x046d, 0x09a2): /* QuickCam Communicate Deluxe/S7500 */
974 /* Most audio usb devices lie about volume resolution.
975 * Most Logitech webcams have res = 384.
976 * Probably there is some logitech magic behind this number --fishor
977 */
978 if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
979 usb_audio_info(chip,
980 "set resolution quirk: cval->res = 384\n");
981 cval->res = 384;
982 }
983 break;
984 case USB_ID(0x0495, 0x3042): /* ESS Technology Asus USB DAC */
985 if ((strstr(kctl->id.name, "Playback Volume") != NULL) ||
986 strstr(kctl->id.name, "Capture Volume") != NULL) {
987 cval->min >>= 8;
988 cval->max = 0;
989 cval->res = 1;
990 }
991 break;
992 }
993 }
994
995 /*
996 * retrieve the minimum and maximum values for the specified control
997 */
998 static int get_min_max_with_quirks(struct usb_mixer_elem_info *cval,
999 int default_min, struct snd_kcontrol *kctl)
1000 {
1001 /* for failsafe */
1002 cval->min = default_min;
1003 cval->max = cval->min + 1;
1004 cval->res = 1;
1005 cval->dBmin = cval->dBmax = 0;
1006
1007 if (cval->val_type == USB_MIXER_BOOLEAN ||
1008 cval->val_type == USB_MIXER_INV_BOOLEAN) {
1009 cval->initialized = 1;
1010 } else {
1011 int minchn = 0;
1012 if (cval->cmask) {
1013 int i;
1014 for (i = 0; i < MAX_CHANNELS; i++)
1015 if (cval->cmask & (1 << i)) {
1016 minchn = i + 1;
1017 break;
1018 }
1019 }
1020 if (get_ctl_value(cval, UAC_GET_MAX, (cval->control << 8) | minchn, &cval->max) < 0 ||
1021 get_ctl_value(cval, UAC_GET_MIN, (cval->control << 8) | minchn, &cval->min) < 0) {
1022 usb_audio_err(cval->head.mixer->chip,
1023 "%d:%d: cannot get min/max values for control %d (id %d)\n",
1024 cval->head.id, snd_usb_ctrl_intf(cval->head.mixer->chip),
1025 cval->control, cval->head.id);
1026 return -EINVAL;
1027 }
1028 if (get_ctl_value(cval, UAC_GET_RES,
1029 (cval->control << 8) | minchn,
1030 &cval->res) < 0) {
1031 cval->res = 1;
1032 } else {
1033 int last_valid_res = cval->res;
1034
1035 while (cval->res > 1) {
1036 if (snd_usb_mixer_set_ctl_value(cval, UAC_SET_RES,
1037 (cval->control << 8) | minchn,
1038 cval->res / 2) < 0)
1039 break;
1040 cval->res /= 2;
1041 }
1042 if (get_ctl_value(cval, UAC_GET_RES,
1043 (cval->control << 8) | minchn, &cval->res) < 0)
1044 cval->res = last_valid_res;
1045 }
1046 if (cval->res == 0)
1047 cval->res = 1;
1048
1049 /* Additional checks for the proper resolution
1050 *
1051 * Some devices report smaller resolutions than actually
1052 * reacting. They don't return errors but simply clip
1053 * to the lower aligned value.
1054 */
1055 if (cval->min + cval->res < cval->max) {
1056 int last_valid_res = cval->res;
1057 int saved, test, check;
1058 if (get_cur_mix_raw(cval, minchn, &saved) < 0)
1059 goto no_res_check;
1060 for (;;) {
1061 test = saved;
1062 if (test < cval->max)
1063 test += cval->res;
1064 else
1065 test -= cval->res;
1066 if (test < cval->min || test > cval->max ||
1067 snd_usb_set_cur_mix_value(cval, minchn, 0, test) ||
1068 get_cur_mix_raw(cval, minchn, &check)) {
1069 cval->res = last_valid_res;
1070 break;
1071 }
1072 if (test == check)
1073 break;
1074 cval->res *= 2;
1075 }
1076 snd_usb_set_cur_mix_value(cval, minchn, 0, saved);
1077 }
1078
1079 no_res_check:
1080 cval->initialized = 1;
1081 }
1082
1083 if (kctl)
1084 volume_control_quirks(cval, kctl);
1085
1086 /* USB descriptions contain the dB scale in 1/256 dB unit
1087 * while ALSA TLV contains in 1/100 dB unit
1088 */
1089 cval->dBmin = (convert_signed_value(cval, cval->min) * 100) / 256;
1090 cval->dBmax = (convert_signed_value(cval, cval->max) * 100) / 256;
1091 if (cval->dBmin > cval->dBmax) {
1092 /* something is wrong; assume it's either from/to 0dB */
1093 if (cval->dBmin < 0)
1094 cval->dBmax = 0;
1095 else if (cval->dBmin > 0)
1096 cval->dBmin = 0;
1097 if (cval->dBmin > cval->dBmax) {
1098 /* totally crap, return an error */
1099 return -EINVAL;
1100 }
1101 }
1102
1103 return 0;
1104 }
1105
1106 #define get_min_max(cval, def) get_min_max_with_quirks(cval, def, NULL)
1107
1108 /* get a feature/mixer unit info */
1109 static int mixer_ctl_feature_info(struct snd_kcontrol *kcontrol,
1110 struct snd_ctl_elem_info *uinfo)
1111 {
1112 struct usb_mixer_elem_info *cval = kcontrol->private_data;
1113
1114 if (cval->val_type == USB_MIXER_BOOLEAN ||
1115 cval->val_type == USB_MIXER_INV_BOOLEAN)
1116 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1117 else
1118 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
1119 uinfo->count = cval->channels;
1120 if (cval->val_type == USB_MIXER_BOOLEAN ||
1121 cval->val_type == USB_MIXER_INV_BOOLEAN) {
1122 uinfo->value.integer.min = 0;
1123 uinfo->value.integer.max = 1;
1124 } else {
1125 if (!cval->initialized) {
1126 get_min_max_with_quirks(cval, 0, kcontrol);
1127 if (cval->initialized && cval->dBmin >= cval->dBmax) {
1128 kcontrol->vd[0].access &=
1129 ~(SNDRV_CTL_ELEM_ACCESS_TLV_READ |
1130 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK);
1131 snd_ctl_notify(cval->head.mixer->chip->card,
1132 SNDRV_CTL_EVENT_MASK_INFO,
1133 &kcontrol->id);
1134 }
1135 }
1136 uinfo->value.integer.min = 0;
1137 uinfo->value.integer.max =
1138 (cval->max - cval->min + cval->res - 1) / cval->res;
1139 }
1140 return 0;
1141 }
1142
1143 /* get the current value from feature/mixer unit */
1144 static int mixer_ctl_feature_get(struct snd_kcontrol *kcontrol,
1145 struct snd_ctl_elem_value *ucontrol)
1146 {
1147 struct usb_mixer_elem_info *cval = kcontrol->private_data;
1148 int c, cnt, val, err;
1149
1150 ucontrol->value.integer.value[0] = cval->min;
1151 if (cval->cmask) {
1152 cnt = 0;
1153 for (c = 0; c < MAX_CHANNELS; c++) {
1154 if (!(cval->cmask & (1 << c)))
1155 continue;
1156 err = snd_usb_get_cur_mix_value(cval, c + 1, cnt, &val);
1157 if (err < 0)
1158 return filter_error(cval, err);
1159 val = get_relative_value(cval, val);
1160 ucontrol->value.integer.value[cnt] = val;
1161 cnt++;
1162 }
1163 return 0;
1164 } else {
1165 /* master channel */
1166 err = snd_usb_get_cur_mix_value(cval, 0, 0, &val);
1167 if (err < 0)
1168 return filter_error(cval, err);
1169 val = get_relative_value(cval, val);
1170 ucontrol->value.integer.value[0] = val;
1171 }
1172 return 0;
1173 }
1174
1175 /* put the current value to feature/mixer unit */
1176 static int mixer_ctl_feature_put(struct snd_kcontrol *kcontrol,
1177 struct snd_ctl_elem_value *ucontrol)
1178 {
1179 struct usb_mixer_elem_info *cval = kcontrol->private_data;
1180 int c, cnt, val, oval, err;
1181 int changed = 0;
1182
1183 if (cval->cmask) {
1184 cnt = 0;
1185 for (c = 0; c < MAX_CHANNELS; c++) {
1186 if (!(cval->cmask & (1 << c)))
1187 continue;
1188 err = snd_usb_get_cur_mix_value(cval, c + 1, cnt, &oval);
1189 if (err < 0)
1190 return filter_error(cval, err);
1191 val = ucontrol->value.integer.value[cnt];
1192 val = get_abs_value(cval, val);
1193 if (oval != val) {
1194 snd_usb_set_cur_mix_value(cval, c + 1, cnt, val);
1195 changed = 1;
1196 }
1197 cnt++;
1198 }
1199 } else {
1200 /* master channel */
1201 err = snd_usb_get_cur_mix_value(cval, 0, 0, &oval);
1202 if (err < 0)
1203 return filter_error(cval, err);
1204 val = ucontrol->value.integer.value[0];
1205 val = get_abs_value(cval, val);
1206 if (val != oval) {
1207 snd_usb_set_cur_mix_value(cval, 0, 0, val);
1208 changed = 1;
1209 }
1210 }
1211 return changed;
1212 }
1213
1214 static struct snd_kcontrol_new usb_feature_unit_ctl = {
1215 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1216 .name = "", /* will be filled later manually */
1217 .info = mixer_ctl_feature_info,
1218 .get = mixer_ctl_feature_get,
1219 .put = mixer_ctl_feature_put,
1220 };
1221
1222 /* the read-only variant */
1223 static struct snd_kcontrol_new usb_feature_unit_ctl_ro = {
1224 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1225 .name = "", /* will be filled later manually */
1226 .info = mixer_ctl_feature_info,
1227 .get = mixer_ctl_feature_get,
1228 .put = NULL,
1229 };
1230
1231 /*
1232 * This symbol is exported in order to allow the mixer quirks to
1233 * hook up to the standard feature unit control mechanism
1234 */
1235 struct snd_kcontrol_new *snd_usb_feature_unit_ctl = &usb_feature_unit_ctl;
1236
1237 /*
1238 * build a feature control
1239 */
1240 static size_t append_ctl_name(struct snd_kcontrol *kctl, const char *str)
1241 {
1242 return strlcat(kctl->id.name, str, sizeof(kctl->id.name));
1243 }
1244
1245 /*
1246 * A lot of headsets/headphones have a "Speaker" mixer. Make sure we
1247 * rename it to "Headphone". We determine if something is a headphone
1248 * similar to how udev determines form factor.
1249 */
1250 static void check_no_speaker_on_headset(struct snd_kcontrol *kctl,
1251 struct snd_card *card)
1252 {
1253 const char *names_to_check[] = {
1254 "Headset", "headset", "Headphone", "headphone", NULL};
1255 const char **s;
1256 bool found = false;
1257
1258 if (strcmp("Speaker", kctl->id.name))
1259 return;
1260
1261 for (s = names_to_check; *s; s++)
1262 if (strstr(card->shortname, *s)) {
1263 found = true;
1264 break;
1265 }
1266
1267 if (!found)
1268 return;
1269
1270 strlcpy(kctl->id.name, "Headphone", sizeof(kctl->id.name));
1271 }
1272
1273 static void build_feature_ctl(struct mixer_build *state, void *raw_desc,
1274 unsigned int ctl_mask, int control,
1275 struct usb_audio_term *iterm, int unitid,
1276 int readonly_mask)
1277 {
1278 struct uac_feature_unit_descriptor *desc = raw_desc;
1279 struct usb_feature_control_info *ctl_info;
1280 unsigned int len = 0;
1281 int mapped_name = 0;
1282 int nameid = uac_feature_unit_iFeature(desc);
1283 struct snd_kcontrol *kctl;
1284 struct usb_mixer_elem_info *cval;
1285 const struct usbmix_name_map *map;
1286 unsigned int range;
1287
1288 control++; /* change from zero-based to 1-based value */
1289
1290 if (control == UAC_FU_GRAPHIC_EQUALIZER) {
1291 /* FIXME: not supported yet */
1292 return;
1293 }
1294
1295 map = find_map(state, unitid, control);
1296 if (check_ignored_ctl(map))
1297 return;
1298
1299 cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1300 if (!cval)
1301 return;
1302 snd_usb_mixer_elem_init_std(&cval->head, state->mixer, unitid);
1303 cval->control = control;
1304 cval->cmask = ctl_mask;
1305 ctl_info = &audio_feature_info[control-1];
1306 if (state->mixer->protocol == UAC_VERSION_1)
1307 cval->val_type = ctl_info->type;
1308 else /* UAC_VERSION_2 */
1309 cval->val_type = ctl_info->type_uac2 >= 0 ?
1310 ctl_info->type_uac2 : ctl_info->type;
1311
1312 if (ctl_mask == 0) {
1313 cval->channels = 1; /* master channel */
1314 cval->master_readonly = readonly_mask;
1315 } else {
1316 int i, c = 0;
1317 for (i = 0; i < 16; i++)
1318 if (ctl_mask & (1 << i))
1319 c++;
1320 cval->channels = c;
1321 cval->ch_readonly = readonly_mask;
1322 }
1323
1324 /*
1325 * If all channels in the mask are marked read-only, make the control
1326 * read-only. snd_usb_set_cur_mix_value() will check the mask again and won't
1327 * issue write commands to read-only channels.
1328 */
1329 if (cval->channels == readonly_mask)
1330 kctl = snd_ctl_new1(&usb_feature_unit_ctl_ro, cval);
1331 else
1332 kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
1333
1334 if (!kctl) {
1335 usb_audio_err(state->chip, "cannot malloc kcontrol\n");
1336 kfree(cval);
1337 return;
1338 }
1339 kctl->private_free = snd_usb_mixer_elem_free;
1340
1341 len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
1342 mapped_name = len != 0;
1343 if (!len && nameid)
1344 len = snd_usb_copy_string_desc(state, nameid,
1345 kctl->id.name, sizeof(kctl->id.name));
1346
1347 switch (control) {
1348 case UAC_FU_MUTE:
1349 case UAC_FU_VOLUME:
1350 /*
1351 * determine the control name. the rule is:
1352 * - if a name id is given in descriptor, use it.
1353 * - if the connected input can be determined, then use the name
1354 * of terminal type.
1355 * - if the connected output can be determined, use it.
1356 * - otherwise, anonymous name.
1357 */
1358 if (!len) {
1359 len = get_term_name(state, iterm, kctl->id.name,
1360 sizeof(kctl->id.name), 1);
1361 if (!len)
1362 len = get_term_name(state, &state->oterm,
1363 kctl->id.name,
1364 sizeof(kctl->id.name), 1);
1365 if (!len)
1366 snprintf(kctl->id.name, sizeof(kctl->id.name),
1367 "Feature %d", unitid);
1368 }
1369
1370 if (!mapped_name)
1371 check_no_speaker_on_headset(kctl, state->mixer->chip->card);
1372
1373 /*
1374 * determine the stream direction:
1375 * if the connected output is USB stream, then it's likely a
1376 * capture stream. otherwise it should be playback (hopefully :)
1377 */
1378 if (!mapped_name && !(state->oterm.type >> 16)) {
1379 if ((state->oterm.type & 0xff00) == 0x0100)
1380 append_ctl_name(kctl, " Capture");
1381 else
1382 append_ctl_name(kctl, " Playback");
1383 }
1384 append_ctl_name(kctl, control == UAC_FU_MUTE ?
1385 " Switch" : " Volume");
1386 break;
1387 default:
1388 if (!len)
1389 strlcpy(kctl->id.name, audio_feature_info[control-1].name,
1390 sizeof(kctl->id.name));
1391 break;
1392 }
1393
1394 /* get min/max values */
1395 get_min_max_with_quirks(cval, 0, kctl);
1396
1397 if (control == UAC_FU_VOLUME) {
1398 check_mapped_dB(map, cval);
1399 if (cval->dBmin < cval->dBmax || !cval->initialized) {
1400 kctl->tlv.c = snd_usb_mixer_vol_tlv;
1401 kctl->vd[0].access |=
1402 SNDRV_CTL_ELEM_ACCESS_TLV_READ |
1403 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
1404 }
1405 }
1406
1407 snd_usb_mixer_fu_apply_quirk(state->mixer, cval, unitid, kctl);
1408
1409 range = (cval->max - cval->min) / cval->res;
1410 /*
1411 * Are there devices with volume range more than 255? I use a bit more
1412 * to be sure. 384 is a resolution magic number found on Logitech
1413 * devices. It will definitively catch all buggy Logitech devices.
1414 */
1415 if (range > 384) {
1416 usb_audio_warn(state->chip,
1417 "Warning! Unlikely big volume range (=%u), cval->res is probably wrong.",
1418 range);
1419 usb_audio_warn(state->chip,
1420 "[%d] FU [%s] ch = %d, val = %d/%d/%d",
1421 cval->head.id, kctl->id.name, cval->channels,
1422 cval->min, cval->max, cval->res);
1423 }
1424
1425 usb_audio_dbg(state->chip, "[%d] FU [%s] ch = %d, val = %d/%d/%d\n",
1426 cval->head.id, kctl->id.name, cval->channels,
1427 cval->min, cval->max, cval->res);
1428 snd_usb_mixer_add_control(&cval->head, kctl);
1429 }
1430
1431 /*
1432 * parse a feature unit
1433 *
1434 * most of controls are defined here.
1435 */
1436 static int parse_audio_feature_unit(struct mixer_build *state, int unitid,
1437 void *_ftr)
1438 {
1439 int channels, i, j;
1440 struct usb_audio_term iterm;
1441 unsigned int master_bits, first_ch_bits;
1442 int err, csize;
1443 struct uac_feature_unit_descriptor *hdr = _ftr;
1444 __u8 *bmaControls;
1445
1446 if (state->mixer->protocol == UAC_VERSION_1) {
1447 if (hdr->bLength < 7) {
1448 usb_audio_err(state->chip,
1449 "unit %u: invalid UAC_FEATURE_UNIT descriptor\n",
1450 unitid);
1451 return -EINVAL;
1452 }
1453 csize = hdr->bControlSize;
1454 if (!csize) {
1455 usb_audio_dbg(state->chip,
1456 "unit %u: invalid bControlSize == 0\n",
1457 unitid);
1458 return -EINVAL;
1459 }
1460 channels = (hdr->bLength - 7) / csize - 1;
1461 bmaControls = hdr->bmaControls;
1462 if (hdr->bLength < 7 + csize) {
1463 usb_audio_err(state->chip,
1464 "unit %u: invalid UAC_FEATURE_UNIT descriptor\n",
1465 unitid);
1466 return -EINVAL;
1467 }
1468 } else {
1469 struct uac2_feature_unit_descriptor *ftr = _ftr;
1470 if (hdr->bLength < 6) {
1471 usb_audio_err(state->chip,
1472 "unit %u: invalid UAC_FEATURE_UNIT descriptor\n",
1473 unitid);
1474 return -EINVAL;
1475 }
1476 csize = 4;
1477 channels = (hdr->bLength - 6) / 4 - 1;
1478 bmaControls = ftr->bmaControls;
1479 if (hdr->bLength < 6 + csize) {
1480 usb_audio_err(state->chip,
1481 "unit %u: invalid UAC_FEATURE_UNIT descriptor\n",
1482 unitid);
1483 return -EINVAL;
1484 }
1485 }
1486
1487 /* parse the source unit */
1488 if ((err = parse_audio_unit(state, hdr->bSourceID)) < 0)
1489 return err;
1490
1491 /* determine the input source type and name */
1492 err = check_input_term(state, hdr->bSourceID, &iterm);
1493 if (err < 0)
1494 return err;
1495
1496 master_bits = snd_usb_combine_bytes(bmaControls, csize);
1497 /* master configuration quirks */
1498 switch (state->chip->usb_id) {
1499 case USB_ID(0x08bb, 0x2702):
1500 usb_audio_info(state->chip,
1501 "usbmixer: master volume quirk for PCM2702 chip\n");
1502 /* disable non-functional volume control */
1503 master_bits &= ~UAC_CONTROL_BIT(UAC_FU_VOLUME);
1504 break;
1505 case USB_ID(0x1130, 0xf211):
1506 usb_audio_info(state->chip,
1507 "usbmixer: volume control quirk for Tenx TP6911 Audio Headset\n");
1508 /* disable non-functional volume control */
1509 channels = 0;
1510 break;
1511
1512 }
1513 if (channels > 0)
1514 first_ch_bits = snd_usb_combine_bytes(bmaControls + csize, csize);
1515 else
1516 first_ch_bits = 0;
1517
1518 if (state->mixer->protocol == UAC_VERSION_1) {
1519 /* check all control types */
1520 for (i = 0; i < 10; i++) {
1521 unsigned int ch_bits = 0;
1522 for (j = 0; j < channels; j++) {
1523 unsigned int mask;
1524
1525 mask = snd_usb_combine_bytes(bmaControls +
1526 csize * (j+1), csize);
1527 if (mask & (1 << i))
1528 ch_bits |= (1 << j);
1529 }
1530 /* audio class v1 controls are never read-only */
1531
1532 /*
1533 * The first channel must be set
1534 * (for ease of programming).
1535 */
1536 if (ch_bits & 1)
1537 build_feature_ctl(state, _ftr, ch_bits, i,
1538 &iterm, unitid, 0);
1539 if (master_bits & (1 << i))
1540 build_feature_ctl(state, _ftr, 0, i, &iterm,
1541 unitid, 0);
1542 }
1543 } else { /* UAC_VERSION_2 */
1544 for (i = 0; i < ARRAY_SIZE(audio_feature_info); i++) {
1545 unsigned int ch_bits = 0;
1546 unsigned int ch_read_only = 0;
1547
1548 for (j = 0; j < channels; j++) {
1549 unsigned int mask;
1550
1551 mask = snd_usb_combine_bytes(bmaControls +
1552 csize * (j+1), csize);
1553 if (uac2_control_is_readable(mask, i)) {
1554 ch_bits |= (1 << j);
1555 if (!uac2_control_is_writeable(mask, i))
1556 ch_read_only |= (1 << j);
1557 }
1558 }
1559
1560 /*
1561 * NOTE: build_feature_ctl() will mark the control
1562 * read-only if all channels are marked read-only in
1563 * the descriptors. Otherwise, the control will be
1564 * reported as writeable, but the driver will not
1565 * actually issue a write command for read-only
1566 * channels.
1567 */
1568
1569 /*
1570 * The first channel must be set
1571 * (for ease of programming).
1572 */
1573 if (ch_bits & 1)
1574 build_feature_ctl(state, _ftr, ch_bits, i,
1575 &iterm, unitid, ch_read_only);
1576 if (uac2_control_is_readable(master_bits, i))
1577 build_feature_ctl(state, _ftr, 0, i, &iterm, unitid,
1578 !uac2_control_is_writeable(master_bits, i));
1579 }
1580 }
1581
1582 return 0;
1583 }
1584
1585 /*
1586 * Mixer Unit
1587 */
1588
1589 /*
1590 * build a mixer unit control
1591 *
1592 * the callbacks are identical with feature unit.
1593 * input channel number (zero based) is given in control field instead.
1594 */
1595 static void build_mixer_unit_ctl(struct mixer_build *state,
1596 struct uac_mixer_unit_descriptor *desc,
1597 int in_pin, int in_ch, int unitid,
1598 struct usb_audio_term *iterm)
1599 {
1600 struct usb_mixer_elem_info *cval;
1601 unsigned int num_outs = uac_mixer_unit_bNrChannels(desc);
1602 unsigned int i, len;
1603 struct snd_kcontrol *kctl;
1604 const struct usbmix_name_map *map;
1605
1606 map = find_map(state, unitid, 0);
1607 if (check_ignored_ctl(map))
1608 return;
1609
1610 cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1611 if (!cval)
1612 return;
1613
1614 snd_usb_mixer_elem_init_std(&cval->head, state->mixer, unitid);
1615 cval->control = in_ch + 1; /* based on 1 */
1616 cval->val_type = USB_MIXER_S16;
1617 for (i = 0; i < num_outs; i++) {
1618 __u8 *c = uac_mixer_unit_bmControls(desc, state->mixer->protocol);
1619
1620 if (check_matrix_bitmap(c, in_ch, i, num_outs)) {
1621 cval->cmask |= (1 << i);
1622 cval->channels++;
1623 }
1624 }
1625
1626 /* get min/max values */
1627 get_min_max(cval, 0);
1628
1629 kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
1630 if (!kctl) {
1631 usb_audio_err(state->chip, "cannot malloc kcontrol\n");
1632 kfree(cval);
1633 return;
1634 }
1635 kctl->private_free = snd_usb_mixer_elem_free;
1636
1637 len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
1638 if (!len)
1639 len = get_term_name(state, iterm, kctl->id.name,
1640 sizeof(kctl->id.name), 0);
1641 if (!len)
1642 len = sprintf(kctl->id.name, "Mixer Source %d", in_ch + 1);
1643 append_ctl_name(kctl, " Volume");
1644
1645 usb_audio_dbg(state->chip, "[%d] MU [%s] ch = %d, val = %d/%d\n",
1646 cval->head.id, kctl->id.name, cval->channels, cval->min, cval->max);
1647 snd_usb_mixer_add_control(&cval->head, kctl);
1648 }
1649
1650 /*
1651 * parse a mixer unit
1652 */
1653 static int parse_audio_mixer_unit(struct mixer_build *state, int unitid,
1654 void *raw_desc)
1655 {
1656 struct uac_mixer_unit_descriptor *desc = raw_desc;
1657 struct usb_audio_term iterm;
1658 int input_pins, num_ins, num_outs;
1659 int pin, ich, err;
1660
1661 if (desc->bLength < 11 || !(input_pins = desc->bNrInPins) ||
1662 desc->bLength < sizeof(*desc) + desc->bNrInPins ||
1663 !(num_outs = uac_mixer_unit_bNrChannels(desc))) {
1664 usb_audio_err(state->chip,
1665 "invalid MIXER UNIT descriptor %d\n",
1666 unitid);
1667 return -EINVAL;
1668 }
1669
1670 num_ins = 0;
1671 ich = 0;
1672 for (pin = 0; pin < input_pins; pin++) {
1673 err = parse_audio_unit(state, desc->baSourceID[pin]);
1674 if (err < 0)
1675 continue;
1676 /* no bmControls field (e.g. Maya44) -> ignore */
1677 if (desc->bLength <= 10 + input_pins)
1678 continue;
1679 err = check_input_term(state, desc->baSourceID[pin], &iterm);
1680 if (err < 0)
1681 return err;
1682 num_ins += iterm.channels;
1683 for (; ich < num_ins; ich++) {
1684 int och, ich_has_controls = 0;
1685
1686 for (och = 0; och < num_outs; och++) {
1687 __u8 *c = uac_mixer_unit_bmControls(desc,
1688 state->mixer->protocol);
1689
1690 if (check_matrix_bitmap(c, ich, och, num_outs)) {
1691 ich_has_controls = 1;
1692 break;
1693 }
1694 }
1695 if (ich_has_controls)
1696 build_mixer_unit_ctl(state, desc, pin, ich,
1697 unitid, &iterm);
1698 }
1699 }
1700 return 0;
1701 }
1702
1703 /*
1704 * Processing Unit / Extension Unit
1705 */
1706
1707 /* get callback for processing/extension unit */
1708 static int mixer_ctl_procunit_get(struct snd_kcontrol *kcontrol,
1709 struct snd_ctl_elem_value *ucontrol)
1710 {
1711 struct usb_mixer_elem_info *cval = kcontrol->private_data;
1712 int err, val;
1713
1714 err = get_cur_ctl_value(cval, cval->control << 8, &val);
1715 if (err < 0) {
1716 ucontrol->value.integer.value[0] = cval->min;
1717 return filter_error(cval, err);
1718 }
1719 val = get_relative_value(cval, val);
1720 ucontrol->value.integer.value[0] = val;
1721 return 0;
1722 }
1723
1724 /* put callback for processing/extension unit */
1725 static int mixer_ctl_procunit_put(struct snd_kcontrol *kcontrol,
1726 struct snd_ctl_elem_value *ucontrol)
1727 {
1728 struct usb_mixer_elem_info *cval = kcontrol->private_data;
1729 int val, oval, err;
1730
1731 err = get_cur_ctl_value(cval, cval->control << 8, &oval);
1732 if (err < 0)
1733 return filter_error(cval, err);
1734 val = ucontrol->value.integer.value[0];
1735 val = get_abs_value(cval, val);
1736 if (val != oval) {
1737 set_cur_ctl_value(cval, cval->control << 8, val);
1738 return 1;
1739 }
1740 return 0;
1741 }
1742
1743 /* alsa control interface for processing/extension unit */
1744 static struct snd_kcontrol_new mixer_procunit_ctl = {
1745 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1746 .name = "", /* will be filled later */
1747 .info = mixer_ctl_feature_info,
1748 .get = mixer_ctl_procunit_get,
1749 .put = mixer_ctl_procunit_put,
1750 };
1751
1752 /*
1753 * predefined data for processing units
1754 */
1755 struct procunit_value_info {
1756 int control;
1757 char *suffix;
1758 int val_type;
1759 int min_value;
1760 };
1761
1762 struct procunit_info {
1763 int type;
1764 char *name;
1765 struct procunit_value_info *values;
1766 };
1767
1768 static struct procunit_value_info updown_proc_info[] = {
1769 { UAC_UD_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1770 { UAC_UD_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
1771 { 0 }
1772 };
1773 static struct procunit_value_info prologic_proc_info[] = {
1774 { UAC_DP_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1775 { UAC_DP_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
1776 { 0 }
1777 };
1778 static struct procunit_value_info threed_enh_proc_info[] = {
1779 { UAC_3D_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1780 { UAC_3D_SPACE, "Spaciousness", USB_MIXER_U8 },
1781 { 0 }
1782 };
1783 static struct procunit_value_info reverb_proc_info[] = {
1784 { UAC_REVERB_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1785 { UAC_REVERB_LEVEL, "Level", USB_MIXER_U8 },
1786 { UAC_REVERB_TIME, "Time", USB_MIXER_U16 },
1787 { UAC_REVERB_FEEDBACK, "Feedback", USB_MIXER_U8 },
1788 { 0 }
1789 };
1790 static struct procunit_value_info chorus_proc_info[] = {
1791 { UAC_CHORUS_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1792 { UAC_CHORUS_LEVEL, "Level", USB_MIXER_U8 },
1793 { UAC_CHORUS_RATE, "Rate", USB_MIXER_U16 },
1794 { UAC_CHORUS_DEPTH, "Depth", USB_MIXER_U16 },
1795 { 0 }
1796 };
1797 static struct procunit_value_info dcr_proc_info[] = {
1798 { UAC_DCR_ENABLE, "Switch", USB_MIXER_BOOLEAN },
1799 { UAC_DCR_RATE, "Ratio", USB_MIXER_U16 },
1800 { UAC_DCR_MAXAMPL, "Max Amp", USB_MIXER_S16 },
1801 { UAC_DCR_THRESHOLD, "Threshold", USB_MIXER_S16 },
1802 { UAC_DCR_ATTACK_TIME, "Attack Time", USB_MIXER_U16 },
1803 { UAC_DCR_RELEASE_TIME, "Release Time", USB_MIXER_U16 },
1804 { 0 }
1805 };
1806
1807 static struct procunit_info procunits[] = {
1808 { UAC_PROCESS_UP_DOWNMIX, "Up Down", updown_proc_info },
1809 { UAC_PROCESS_DOLBY_PROLOGIC, "Dolby Prologic", prologic_proc_info },
1810 { UAC_PROCESS_STEREO_EXTENDER, "3D Stereo Extender", threed_enh_proc_info },
1811 { UAC_PROCESS_REVERB, "Reverb", reverb_proc_info },
1812 { UAC_PROCESS_CHORUS, "Chorus", chorus_proc_info },
1813 { UAC_PROCESS_DYN_RANGE_COMP, "DCR", dcr_proc_info },
1814 { 0 },
1815 };
1816 /*
1817 * predefined data for extension units
1818 */
1819 static struct procunit_value_info clock_rate_xu_info[] = {
1820 { USB_XU_CLOCK_RATE_SELECTOR, "Selector", USB_MIXER_U8, 0 },
1821 { 0 }
1822 };
1823 static struct procunit_value_info clock_source_xu_info[] = {
1824 { USB_XU_CLOCK_SOURCE_SELECTOR, "External", USB_MIXER_BOOLEAN },
1825 { 0 }
1826 };
1827 static struct procunit_value_info spdif_format_xu_info[] = {
1828 { USB_XU_DIGITAL_FORMAT_SELECTOR, "SPDIF/AC3", USB_MIXER_BOOLEAN },
1829 { 0 }
1830 };
1831 static struct procunit_value_info soft_limit_xu_info[] = {
1832 { USB_XU_SOFT_LIMIT_SELECTOR, " ", USB_MIXER_BOOLEAN },
1833 { 0 }
1834 };
1835 static struct procunit_info extunits[] = {
1836 { USB_XU_CLOCK_RATE, "Clock rate", clock_rate_xu_info },
1837 { USB_XU_CLOCK_SOURCE, "DigitalIn CLK source", clock_source_xu_info },
1838 { USB_XU_DIGITAL_IO_STATUS, "DigitalOut format:", spdif_format_xu_info },
1839 { USB_XU_DEVICE_OPTIONS, "AnalogueIn Soft Limit", soft_limit_xu_info },
1840 { 0 }
1841 };
1842
1843 /*
1844 * build a processing/extension unit
1845 */
1846 static int build_audio_procunit(struct mixer_build *state, int unitid,
1847 void *raw_desc, struct procunit_info *list,
1848 char *name)
1849 {
1850 struct uac_processing_unit_descriptor *desc = raw_desc;
1851 int num_ins;
1852 struct usb_mixer_elem_info *cval;
1853 struct snd_kcontrol *kctl;
1854 int i, err, nameid, type, len;
1855 struct procunit_info *info;
1856 struct procunit_value_info *valinfo;
1857 const struct usbmix_name_map *map;
1858 static struct procunit_value_info default_value_info[] = {
1859 { 0x01, "Switch", USB_MIXER_BOOLEAN },
1860 { 0 }
1861 };
1862 static struct procunit_info default_info = {
1863 0, NULL, default_value_info
1864 };
1865
1866 if (desc->bLength < 13) {
1867 usb_audio_err(state->chip, "invalid %s descriptor (id %d)\n", name, unitid);
1868 return -EINVAL;
1869 }
1870
1871 num_ins = desc->bNrInPins;
1872 if (desc->bLength < 13 + num_ins ||
1873 desc->bLength < num_ins + uac_processing_unit_bControlSize(desc, state->mixer->protocol)) {
1874 usb_audio_err(state->chip, "invalid %s descriptor (id %d)\n", name, unitid);
1875 return -EINVAL;
1876 }
1877
1878 for (i = 0; i < num_ins; i++) {
1879 if ((err = parse_audio_unit(state, desc->baSourceID[i])) < 0)
1880 return err;
1881 }
1882
1883 type = le16_to_cpu(desc->wProcessType);
1884 for (info = list; info && info->type; info++)
1885 if (info->type == type)
1886 break;
1887 if (!info || !info->type)
1888 info = &default_info;
1889
1890 for (valinfo = info->values; valinfo->control; valinfo++) {
1891 __u8 *controls = uac_processing_unit_bmControls(desc, state->mixer->protocol);
1892
1893 if (!(controls[valinfo->control / 8] & (1 << ((valinfo->control % 8) - 1))))
1894 continue;
1895 map = find_map(state, unitid, valinfo->control);
1896 if (check_ignored_ctl(map))
1897 continue;
1898 cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1899 if (!cval)
1900 return -ENOMEM;
1901 snd_usb_mixer_elem_init_std(&cval->head, state->mixer, unitid);
1902 cval->control = valinfo->control;
1903 cval->val_type = valinfo->val_type;
1904 cval->channels = 1;
1905
1906 /* get min/max values */
1907 if (type == UAC_PROCESS_UP_DOWNMIX && cval->control == UAC_UD_MODE_SELECT) {
1908 __u8 *control_spec = uac_processing_unit_specific(desc, state->mixer->protocol);
1909 /* FIXME: hard-coded */
1910 cval->min = 1;
1911 cval->max = control_spec[0];
1912 cval->res = 1;
1913 cval->initialized = 1;
1914 } else {
1915 if (type == USB_XU_CLOCK_RATE) {
1916 /*
1917 * E-Mu USB 0404/0202/TrackerPre/0204
1918 * samplerate control quirk
1919 */
1920 cval->min = 0;
1921 cval->max = 5;
1922 cval->res = 1;
1923 cval->initialized = 1;
1924 } else
1925 get_min_max(cval, valinfo->min_value);
1926 }
1927
1928 kctl = snd_ctl_new1(&mixer_procunit_ctl, cval);
1929 if (!kctl) {
1930 kfree(cval);
1931 return -ENOMEM;
1932 }
1933 kctl->private_free = snd_usb_mixer_elem_free;
1934
1935 if (check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name))) {
1936 /* nothing */ ;
1937 } else if (info->name) {
1938 strlcpy(kctl->id.name, info->name, sizeof(kctl->id.name));
1939 } else {
1940 nameid = uac_processing_unit_iProcessing(desc, state->mixer->protocol);
1941 len = 0;
1942 if (nameid)
1943 len = snd_usb_copy_string_desc(state, nameid,
1944 kctl->id.name,
1945 sizeof(kctl->id.name));
1946 if (!len)
1947 strlcpy(kctl->id.name, name, sizeof(kctl->id.name));
1948 }
1949 append_ctl_name(kctl, " ");
1950 append_ctl_name(kctl, valinfo->suffix);
1951
1952 usb_audio_dbg(state->chip,
1953 "[%d] PU [%s] ch = %d, val = %d/%d\n",
1954 cval->head.id, kctl->id.name, cval->channels,
1955 cval->min, cval->max);
1956
1957 err = snd_usb_mixer_add_control(&cval->head, kctl);
1958 if (err < 0)
1959 return err;
1960 }
1961 return 0;
1962 }
1963
1964 static int parse_audio_processing_unit(struct mixer_build *state, int unitid,
1965 void *raw_desc)
1966 {
1967 return build_audio_procunit(state, unitid, raw_desc,
1968 procunits, "Processing Unit");
1969 }
1970
1971 static int parse_audio_extension_unit(struct mixer_build *state, int unitid,
1972 void *raw_desc)
1973 {
1974 /*
1975 * Note that we parse extension units with processing unit descriptors.
1976 * That's ok as the layout is the same.
1977 */
1978 return build_audio_procunit(state, unitid, raw_desc,
1979 extunits, "Extension Unit");
1980 }
1981
1982 /*
1983 * Selector Unit
1984 */
1985
1986 /*
1987 * info callback for selector unit
1988 * use an enumerator type for routing
1989 */
1990 static int mixer_ctl_selector_info(struct snd_kcontrol *kcontrol,
1991 struct snd_ctl_elem_info *uinfo)
1992 {
1993 struct usb_mixer_elem_info *cval = kcontrol->private_data;
1994 const char **itemlist = (const char **)kcontrol->private_value;
1995
1996 if (snd_BUG_ON(!itemlist))
1997 return -EINVAL;
1998 return snd_ctl_enum_info(uinfo, 1, cval->max, itemlist);
1999 }
2000
2001 /* get callback for selector unit */
2002 static int mixer_ctl_selector_get(struct snd_kcontrol *kcontrol,
2003 struct snd_ctl_elem_value *ucontrol)
2004 {
2005 struct usb_mixer_elem_info *cval = kcontrol->private_data;
2006 int val, err;
2007
2008 err = get_cur_ctl_value(cval, cval->control << 8, &val);
2009 if (err < 0) {
2010 ucontrol->value.enumerated.item[0] = 0;
2011 return filter_error(cval, err);
2012 }
2013 val = get_relative_value(cval, val);
2014 ucontrol->value.enumerated.item[0] = val;
2015 return 0;
2016 }
2017
2018 /* put callback for selector unit */
2019 static int mixer_ctl_selector_put(struct snd_kcontrol *kcontrol,
2020 struct snd_ctl_elem_value *ucontrol)
2021 {
2022 struct usb_mixer_elem_info *cval = kcontrol->private_data;
2023 int val, oval, err;
2024
2025 err = get_cur_ctl_value(cval, cval->control << 8, &oval);
2026 if (err < 0)
2027 return filter_error(cval, err);
2028 val = ucontrol->value.enumerated.item[0];
2029 val = get_abs_value(cval, val);
2030 if (val != oval) {
2031 set_cur_ctl_value(cval, cval->control << 8, val);
2032 return 1;
2033 }
2034 return 0;
2035 }
2036
2037 /* alsa control interface for selector unit */
2038 static struct snd_kcontrol_new mixer_selectunit_ctl = {
2039 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
2040 .name = "", /* will be filled later */
2041 .info = mixer_ctl_selector_info,
2042 .get = mixer_ctl_selector_get,
2043 .put = mixer_ctl_selector_put,
2044 };
2045
2046 /*
2047 * private free callback.
2048 * free both private_data and private_value
2049 */
2050 static void usb_mixer_selector_elem_free(struct snd_kcontrol *kctl)
2051 {
2052 int i, num_ins = 0;
2053
2054 if (kctl->private_data) {
2055 struct usb_mixer_elem_info *cval = kctl->private_data;
2056 num_ins = cval->max;
2057 kfree(cval);
2058 kctl->private_data = NULL;
2059 }
2060 if (kctl->private_value) {
2061 char **itemlist = (char **)kctl->private_value;
2062 for (i = 0; i < num_ins; i++)
2063 kfree(itemlist[i]);
2064 kfree(itemlist);
2065 kctl->private_value = 0;
2066 }
2067 }
2068
2069 /*
2070 * parse a selector unit
2071 */
2072 static int parse_audio_selector_unit(struct mixer_build *state, int unitid,
2073 void *raw_desc)
2074 {
2075 struct uac_selector_unit_descriptor *desc = raw_desc;
2076 unsigned int i, nameid, len;
2077 int err;
2078 struct usb_mixer_elem_info *cval;
2079 struct snd_kcontrol *kctl;
2080 const struct usbmix_name_map *map;
2081 char **namelist;
2082
2083 if (desc->bLength < 5 || !desc->bNrInPins ||
2084 desc->bLength < 5 + desc->bNrInPins) {
2085 usb_audio_err(state->chip,
2086 "invalid SELECTOR UNIT descriptor %d\n", unitid);
2087 return -EINVAL;
2088 }
2089
2090 for (i = 0; i < desc->bNrInPins; i++) {
2091 if ((err = parse_audio_unit(state, desc->baSourceID[i])) < 0)
2092 return err;
2093 }
2094
2095 if (desc->bNrInPins == 1) /* only one ? nonsense! */
2096 return 0;
2097
2098 map = find_map(state, unitid, 0);
2099 if (check_ignored_ctl(map))
2100 return 0;
2101
2102 cval = kzalloc(sizeof(*cval), GFP_KERNEL);
2103 if (!cval)
2104 return -ENOMEM;
2105 snd_usb_mixer_elem_init_std(&cval->head, state->mixer, unitid);
2106 cval->val_type = USB_MIXER_U8;
2107 cval->channels = 1;
2108 cval->min = 1;
2109 cval->max = desc->bNrInPins;
2110 cval->res = 1;
2111 cval->initialized = 1;
2112
2113 if (state->mixer->protocol == UAC_VERSION_1)
2114 cval->control = 0;
2115 else /* UAC_VERSION_2 */
2116 cval->control = (desc->bDescriptorSubtype == UAC2_CLOCK_SELECTOR) ?
2117 UAC2_CX_CLOCK_SELECTOR : UAC2_SU_SELECTOR;
2118
2119 namelist = kmalloc(sizeof(char *) * desc->bNrInPins, GFP_KERNEL);
2120 if (!namelist) {
2121 kfree(cval);
2122 return -ENOMEM;
2123 }
2124 #define MAX_ITEM_NAME_LEN 64
2125 for (i = 0; i < desc->bNrInPins; i++) {
2126 struct usb_audio_term iterm;
2127 len = 0;
2128 namelist[i] = kmalloc(MAX_ITEM_NAME_LEN, GFP_KERNEL);
2129 if (!namelist[i]) {
2130 while (i--)
2131 kfree(namelist[i]);
2132 kfree(namelist);
2133 kfree(cval);
2134 return -ENOMEM;
2135 }
2136 len = check_mapped_selector_name(state, unitid, i, namelist[i],
2137 MAX_ITEM_NAME_LEN);
2138 if (! len && check_input_term(state, desc->baSourceID[i], &iterm) >= 0)
2139 len = get_term_name(state, &iterm, namelist[i], MAX_ITEM_NAME_LEN, 0);
2140 if (! len)
2141 sprintf(namelist[i], "Input %u", i);
2142 }
2143
2144 kctl = snd_ctl_new1(&mixer_selectunit_ctl, cval);
2145 if (! kctl) {
2146 usb_audio_err(state->chip, "cannot malloc kcontrol\n");
2147 for (i = 0; i < desc->bNrInPins; i++)
2148 kfree(namelist[i]);
2149 kfree(namelist);
2150 kfree(cval);
2151 return -ENOMEM;
2152 }
2153 kctl->private_value = (unsigned long)namelist;
2154 kctl->private_free = usb_mixer_selector_elem_free;
2155
2156 /* check the static mapping table at first */
2157 len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
2158 if (!len) {
2159 /* no mapping ? */
2160 /* if iSelector is given, use it */
2161 nameid = uac_selector_unit_iSelector(desc);
2162 if (nameid)
2163 len = snd_usb_copy_string_desc(state, nameid,
2164 kctl->id.name,
2165 sizeof(kctl->id.name));
2166 /* ... or pick up the terminal name at next */
2167 if (!len)
2168 len = get_term_name(state, &state->oterm,
2169 kctl->id.name, sizeof(kctl->id.name), 0);
2170 /* ... or use the fixed string "USB" as the last resort */
2171 if (!len)
2172 strlcpy(kctl->id.name, "USB", sizeof(kctl->id.name));
2173
2174 /* and add the proper suffix */
2175 if (desc->bDescriptorSubtype == UAC2_CLOCK_SELECTOR)
2176 append_ctl_name(kctl, " Clock Source");
2177 else if ((state->oterm.type & 0xff00) == 0x0100)
2178 append_ctl_name(kctl, " Capture Source");
2179 else
2180 append_ctl_name(kctl, " Playback Source");
2181 }
2182
2183 usb_audio_dbg(state->chip, "[%d] SU [%s] items = %d\n",
2184 cval->head.id, kctl->id.name, desc->bNrInPins);
2185 return snd_usb_mixer_add_control(&cval->head, kctl);
2186 }
2187
2188 /*
2189 * parse an audio unit recursively
2190 */
2191
2192 static int parse_audio_unit(struct mixer_build *state, int unitid)
2193 {
2194 unsigned char *p1;
2195
2196 if (test_and_set_bit(unitid, state->unitbitmap))
2197 return 0; /* the unit already visited */
2198
2199 p1 = find_audio_control_unit(state, unitid);
2200 if (!p1) {
2201 usb_audio_err(state->chip, "unit %d not found!\n", unitid);
2202 return -EINVAL;
2203 }
2204
2205 switch (p1[2]) {
2206 case UAC_INPUT_TERMINAL:
2207 case UAC2_CLOCK_SOURCE:
2208 return 0; /* NOP */
2209 case UAC_MIXER_UNIT:
2210 return parse_audio_mixer_unit(state, unitid, p1);
2211 case UAC_SELECTOR_UNIT:
2212 case UAC2_CLOCK_SELECTOR:
2213 return parse_audio_selector_unit(state, unitid, p1);
2214 case UAC_FEATURE_UNIT:
2215 return parse_audio_feature_unit(state, unitid, p1);
2216 case UAC1_PROCESSING_UNIT:
2217 /* UAC2_EFFECT_UNIT has the same value */
2218 if (state->mixer->protocol == UAC_VERSION_1)
2219 return parse_audio_processing_unit(state, unitid, p1);
2220 else
2221 return 0; /* FIXME - effect units not implemented yet */
2222 case UAC1_EXTENSION_UNIT:
2223 /* UAC2_PROCESSING_UNIT_V2 has the same value */
2224 if (state->mixer->protocol == UAC_VERSION_1)
2225 return parse_audio_extension_unit(state, unitid, p1);
2226 else /* UAC_VERSION_2 */
2227 return parse_audio_processing_unit(state, unitid, p1);
2228 case UAC2_EXTENSION_UNIT_V2:
2229 return parse_audio_extension_unit(state, unitid, p1);
2230 default:
2231 usb_audio_err(state->chip,
2232 "unit %u: unexpected type 0x%02x\n", unitid, p1[2]);
2233 return -EINVAL;
2234 }
2235 }
2236
2237 static void snd_usb_mixer_free(struct usb_mixer_interface *mixer)
2238 {
2239 /* kill pending URBs */
2240 snd_usb_mixer_disconnect(mixer);
2241
2242 kfree(mixer->id_elems);
2243 if (mixer->urb) {
2244 kfree(mixer->urb->transfer_buffer);
2245 usb_free_urb(mixer->urb);
2246 }
2247 usb_free_urb(mixer->rc_urb);
2248 kfree(mixer->rc_setup_packet);
2249 kfree(mixer);
2250 }
2251
2252 static int snd_usb_mixer_dev_free(struct snd_device *device)
2253 {
2254 struct usb_mixer_interface *mixer = device->device_data;
2255 snd_usb_mixer_free(mixer);
2256 return 0;
2257 }
2258
2259 /*
2260 * create mixer controls
2261 *
2262 * walk through all UAC_OUTPUT_TERMINAL descriptors to search for mixers
2263 */
2264 static int snd_usb_mixer_controls(struct usb_mixer_interface *mixer)
2265 {
2266 struct mixer_build state;
2267 int err;
2268 const struct usbmix_ctl_map *map;
2269 void *p;
2270
2271 memset(&state, 0, sizeof(state));
2272 state.chip = mixer->chip;
2273 state.mixer = mixer;
2274 state.buffer = mixer->hostif->extra;
2275 state.buflen = mixer->hostif->extralen;
2276
2277 /* check the mapping table */
2278 for (map = usbmix_ctl_maps; map->id; map++) {
2279 if (map->id == state.chip->usb_id) {
2280 state.map = map->map;
2281 state.selector_map = map->selector_map;
2282 mixer->ignore_ctl_error |= map->ignore_ctl_error;
2283 break;
2284 }
2285 }
2286
2287 p = NULL;
2288 while ((p = snd_usb_find_csint_desc(mixer->hostif->extra,
2289 mixer->hostif->extralen,
2290 p, UAC_OUTPUT_TERMINAL)) != NULL) {
2291 if (mixer->protocol == UAC_VERSION_1) {
2292 struct uac1_output_terminal_descriptor *desc = p;
2293
2294 if (desc->bLength < sizeof(*desc))
2295 continue; /* invalid descriptor? */
2296 /* mark terminal ID as visited */
2297 set_bit(desc->bTerminalID, state.unitbitmap);
2298 state.oterm.id = desc->bTerminalID;
2299 state.oterm.type = le16_to_cpu(desc->wTerminalType);
2300 state.oterm.name = desc->iTerminal;
2301 err = parse_audio_unit(&state, desc->bSourceID);
2302 if (err < 0 && err != -EINVAL)
2303 return err;
2304 } else { /* UAC_VERSION_2 */
2305 struct uac2_output_terminal_descriptor *desc = p;
2306
2307 if (desc->bLength < sizeof(*desc))
2308 continue; /* invalid descriptor? */
2309 /* mark terminal ID as visited */
2310 set_bit(desc->bTerminalID, state.unitbitmap);
2311 state.oterm.id = desc->bTerminalID;
2312 state.oterm.type = le16_to_cpu(desc->wTerminalType);
2313 state.oterm.name = desc->iTerminal;
2314 err = parse_audio_unit(&state, desc->bSourceID);
2315 if (err < 0 && err != -EINVAL)
2316 return err;
2317
2318 /*
2319 * For UAC2, use the same approach to also add the
2320 * clock selectors
2321 */
2322 err = parse_audio_unit(&state, desc->bCSourceID);
2323 if (err < 0 && err != -EINVAL)
2324 return err;
2325 }
2326 }
2327
2328 return 0;
2329 }
2330
2331 void snd_usb_mixer_notify_id(struct usb_mixer_interface *mixer, int unitid)
2332 {
2333 struct usb_mixer_elem_list *list;
2334
2335 for_each_mixer_elem(list, mixer, unitid) {
2336 struct usb_mixer_elem_info *info;
2337
2338 if (!list->is_std_info)
2339 continue;
2340 info = mixer_elem_list_to_info(list);
2341 /* invalidate cache, so the value is read from the device */
2342 info->cached = 0;
2343 snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
2344 &list->kctl->id);
2345 }
2346 }
2347
2348 static void snd_usb_mixer_dump_cval(struct snd_info_buffer *buffer,
2349 struct usb_mixer_elem_list *list)
2350 {
2351 struct usb_mixer_elem_info *cval = mixer_elem_list_to_info(list);
2352 static char *val_types[] = {"BOOLEAN", "INV_BOOLEAN",
2353 "S8", "U8", "S16", "U16"};
2354 snd_iprintf(buffer, " Info: id=%i, control=%i, cmask=0x%x, "
2355 "channels=%i, type=\"%s\"\n", cval->head.id,
2356 cval->control, cval->cmask, cval->channels,
2357 val_types[cval->val_type]);
2358 snd_iprintf(buffer, " Volume: min=%i, max=%i, dBmin=%i, dBmax=%i\n",
2359 cval->min, cval->max, cval->dBmin, cval->dBmax);
2360 }
2361
2362 static void snd_usb_mixer_proc_read(struct snd_info_entry *entry,
2363 struct snd_info_buffer *buffer)
2364 {
2365 struct snd_usb_audio *chip = entry->private_data;
2366 struct usb_mixer_interface *mixer;
2367 struct usb_mixer_elem_list *list;
2368 int unitid;
2369
2370 list_for_each_entry(mixer, &chip->mixer_list, list) {
2371 snd_iprintf(buffer,
2372 "USB Mixer: usb_id=0x%08x, ctrlif=%i, ctlerr=%i\n",
2373 chip->usb_id, snd_usb_ctrl_intf(chip),
2374 mixer->ignore_ctl_error);
2375 snd_iprintf(buffer, "Card: %s\n", chip->card->longname);
2376 for (unitid = 0; unitid < MAX_ID_ELEMS; unitid++) {
2377 for_each_mixer_elem(list, mixer, unitid) {
2378 snd_iprintf(buffer, " Unit: %i\n", list->id);
2379 if (list->kctl)
2380 snd_iprintf(buffer,
2381 " Control: name=\"%s\", index=%i\n",
2382 list->kctl->id.name,
2383 list->kctl->id.index);
2384 if (list->dump)
2385 list->dump(buffer, list);
2386 }
2387 }
2388 }
2389 }
2390
2391 static void snd_usb_mixer_interrupt_v2(struct usb_mixer_interface *mixer,
2392 int attribute, int value, int index)
2393 {
2394 struct usb_mixer_elem_list *list;
2395 __u8 unitid = (index >> 8) & 0xff;
2396 __u8 control = (value >> 8) & 0xff;
2397 __u8 channel = value & 0xff;
2398 unsigned int count = 0;
2399
2400 if (channel >= MAX_CHANNELS) {
2401 usb_audio_dbg(mixer->chip,
2402 "%s(): bogus channel number %d\n",
2403 __func__, channel);
2404 return;
2405 }
2406
2407 for_each_mixer_elem(list, mixer, unitid)
2408 count++;
2409
2410 if (count == 0)
2411 return;
2412
2413 for_each_mixer_elem(list, mixer, unitid) {
2414 struct usb_mixer_elem_info *info;
2415
2416 if (!list->kctl)
2417 continue;
2418 if (!list->is_std_info)
2419 continue;
2420
2421 info = mixer_elem_list_to_info(list);
2422 if (count > 1 && info->control != control)
2423 continue;
2424
2425 switch (attribute) {
2426 case UAC2_CS_CUR:
2427 /* invalidate cache, so the value is read from the device */
2428 if (channel)
2429 info->cached &= ~(1 << channel);
2430 else /* master channel */
2431 info->cached = 0;
2432
2433 snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
2434 &info->head.kctl->id);
2435 break;
2436
2437 case UAC2_CS_RANGE:
2438 /* TODO */
2439 break;
2440
2441 case UAC2_CS_MEM:
2442 /* TODO */
2443 break;
2444
2445 default:
2446 usb_audio_dbg(mixer->chip,
2447 "unknown attribute %d in interrupt\n",
2448 attribute);
2449 break;
2450 } /* switch */
2451 }
2452 }
2453
2454 static void snd_usb_mixer_interrupt(struct urb *urb)
2455 {
2456 struct usb_mixer_interface *mixer = urb->context;
2457 int len = urb->actual_length;
2458 int ustatus = urb->status;
2459
2460 if (ustatus != 0)
2461 goto requeue;
2462
2463 if (mixer->protocol == UAC_VERSION_1) {
2464 struct uac1_status_word *status;
2465
2466 for (status = urb->transfer_buffer;
2467 len >= sizeof(*status);
2468 len -= sizeof(*status), status++) {
2469 dev_dbg(&urb->dev->dev, "status interrupt: %02x %02x\n",
2470 status->bStatusType,
2471 status->bOriginator);
2472
2473 /* ignore any notifications not from the control interface */
2474 if ((status->bStatusType & UAC1_STATUS_TYPE_ORIG_MASK) !=
2475 UAC1_STATUS_TYPE_ORIG_AUDIO_CONTROL_IF)
2476 continue;
2477
2478 if (status->bStatusType & UAC1_STATUS_TYPE_MEM_CHANGED)
2479 snd_usb_mixer_rc_memory_change(mixer, status->bOriginator);
2480 else
2481 snd_usb_mixer_notify_id(mixer, status->bOriginator);
2482 }
2483 } else { /* UAC_VERSION_2 */
2484 struct uac2_interrupt_data_msg *msg;
2485
2486 for (msg = urb->transfer_buffer;
2487 len >= sizeof(*msg);
2488 len -= sizeof(*msg), msg++) {
2489 /* drop vendor specific and endpoint requests */
2490 if ((msg->bInfo & UAC2_INTERRUPT_DATA_MSG_VENDOR) ||
2491 (msg->bInfo & UAC2_INTERRUPT_DATA_MSG_EP))
2492 continue;
2493
2494 snd_usb_mixer_interrupt_v2(mixer, msg->bAttribute,
2495 le16_to_cpu(msg->wValue),
2496 le16_to_cpu(msg->wIndex));
2497 }
2498 }
2499
2500 requeue:
2501 if (ustatus != -ENOENT &&
2502 ustatus != -ECONNRESET &&
2503 ustatus != -ESHUTDOWN) {
2504 urb->dev = mixer->chip->dev;
2505 usb_submit_urb(urb, GFP_ATOMIC);
2506 }
2507 }
2508
2509 /* create the handler for the optional status interrupt endpoint */
2510 static int snd_usb_mixer_status_create(struct usb_mixer_interface *mixer)
2511 {
2512 struct usb_endpoint_descriptor *ep;
2513 void *transfer_buffer;
2514 int buffer_length;
2515 unsigned int epnum;
2516
2517 /* we need one interrupt input endpoint */
2518 if (get_iface_desc(mixer->hostif)->bNumEndpoints < 1)
2519 return 0;
2520 ep = get_endpoint(mixer->hostif, 0);
2521 if (!usb_endpoint_dir_in(ep) || !usb_endpoint_xfer_int(ep))
2522 return 0;
2523
2524 epnum = usb_endpoint_num(ep);
2525 buffer_length = le16_to_cpu(ep->wMaxPacketSize);
2526 transfer_buffer = kmalloc(buffer_length, GFP_KERNEL);
2527 if (!transfer_buffer)
2528 return -ENOMEM;
2529 mixer->urb = usb_alloc_urb(0, GFP_KERNEL);
2530 if (!mixer->urb) {
2531 kfree(transfer_buffer);
2532 return -ENOMEM;
2533 }
2534 usb_fill_int_urb(mixer->urb, mixer->chip->dev,
2535 usb_rcvintpipe(mixer->chip->dev, epnum),
2536 transfer_buffer, buffer_length,
2537 snd_usb_mixer_interrupt, mixer, ep->bInterval);
2538 usb_submit_urb(mixer->urb, GFP_KERNEL);
2539 return 0;
2540 }
2541
2542 int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif,
2543 int ignore_error)
2544 {
2545 static struct snd_device_ops dev_ops = {
2546 .dev_free = snd_usb_mixer_dev_free
2547 };
2548 struct usb_mixer_interface *mixer;
2549 struct snd_info_entry *entry;
2550 int err;
2551
2552 strcpy(chip->card->mixername, "USB Mixer");
2553
2554 mixer = kzalloc(sizeof(*mixer), GFP_KERNEL);
2555 if (!mixer)
2556 return -ENOMEM;
2557 mixer->chip = chip;
2558 mixer->ignore_ctl_error = ignore_error;
2559 mixer->id_elems = kcalloc(MAX_ID_ELEMS, sizeof(*mixer->id_elems),
2560 GFP_KERNEL);
2561 if (!mixer->id_elems) {
2562 kfree(mixer);
2563 return -ENOMEM;
2564 }
2565
2566 mixer->hostif = &usb_ifnum_to_if(chip->dev, ctrlif)->altsetting[0];
2567 switch (get_iface_desc(mixer->hostif)->bInterfaceProtocol) {
2568 case UAC_VERSION_1:
2569 default:
2570 mixer->protocol = UAC_VERSION_1;
2571 break;
2572 case UAC_VERSION_2:
2573 mixer->protocol = UAC_VERSION_2;
2574 break;
2575 }
2576
2577 if ((err = snd_usb_mixer_controls(mixer)) < 0 ||
2578 (err = snd_usb_mixer_status_create(mixer)) < 0)
2579 goto _error;
2580
2581 err = snd_usb_mixer_apply_create_quirk(mixer);
2582 if (err < 0)
2583 goto _error;
2584
2585 err = snd_device_new(chip->card, SNDRV_DEV_CODEC, mixer, &dev_ops);
2586 if (err < 0)
2587 goto _error;
2588
2589 if (list_empty(&chip->mixer_list) &&
2590 !snd_card_proc_new(chip->card, "usbmixer", &entry))
2591 snd_info_set_text_ops(entry, chip, snd_usb_mixer_proc_read);
2592
2593 list_add(&mixer->list, &chip->mixer_list);
2594 return 0;
2595
2596 _error:
2597 snd_usb_mixer_free(mixer);
2598 return err;
2599 }
2600
2601 void snd_usb_mixer_disconnect(struct usb_mixer_interface *mixer)
2602 {
2603 if (mixer->disconnected)
2604 return;
2605 if (mixer->urb)
2606 usb_kill_urb(mixer->urb);
2607 if (mixer->rc_urb)
2608 usb_kill_urb(mixer->rc_urb);
2609 mixer->disconnected = true;
2610 }
2611
2612 #ifdef CONFIG_PM
2613 /* stop any bus activity of a mixer */
2614 static void snd_usb_mixer_inactivate(struct usb_mixer_interface *mixer)
2615 {
2616 usb_kill_urb(mixer->urb);
2617 usb_kill_urb(mixer->rc_urb);
2618 }
2619
2620 static int snd_usb_mixer_activate(struct usb_mixer_interface *mixer)
2621 {
2622 int err;
2623
2624 if (mixer->urb) {
2625 err = usb_submit_urb(mixer->urb, GFP_NOIO);
2626 if (err < 0)
2627 return err;
2628 }
2629
2630 return 0;
2631 }
2632
2633 int snd_usb_mixer_suspend(struct usb_mixer_interface *mixer)
2634 {
2635 snd_usb_mixer_inactivate(mixer);
2636 return 0;
2637 }
2638
2639 static int restore_mixer_value(struct usb_mixer_elem_list *list)
2640 {
2641 struct usb_mixer_elem_info *cval = mixer_elem_list_to_info(list);
2642 int c, err, idx;
2643
2644 if (cval->cmask) {
2645 idx = 0;
2646 for (c = 0; c < MAX_CHANNELS; c++) {
2647 if (!(cval->cmask & (1 << c)))
2648 continue;
2649 if (cval->cached & (1 << (c + 1))) {
2650 err = snd_usb_set_cur_mix_value(cval, c + 1, idx,
2651 cval->cache_val[idx]);
2652 if (err < 0)
2653 return err;
2654 }
2655 idx++;
2656 }
2657 } else {
2658 /* master */
2659 if (cval->cached) {
2660 err = snd_usb_set_cur_mix_value(cval, 0, 0, *cval->cache_val);
2661 if (err < 0)
2662 return err;
2663 }
2664 }
2665
2666 return 0;
2667 }
2668
2669 int snd_usb_mixer_resume(struct usb_mixer_interface *mixer, bool reset_resume)
2670 {
2671 struct usb_mixer_elem_list *list;
2672 int id, err;
2673
2674 if (reset_resume) {
2675 /* restore cached mixer values */
2676 for (id = 0; id < MAX_ID_ELEMS; id++) {
2677 for_each_mixer_elem(list, mixer, id) {
2678 if (list->resume) {
2679 err = list->resume(list);
2680 if (err < 0)
2681 return err;
2682 }
2683 }
2684 }
2685 }
2686
2687 return snd_usb_mixer_activate(mixer);
2688 }
2689 #endif
2690
2691 void snd_usb_mixer_elem_init_std(struct usb_mixer_elem_list *list,
2692 struct usb_mixer_interface *mixer,
2693 int unitid)
2694 {
2695 list->mixer = mixer;
2696 list->id = unitid;
2697 list->dump = snd_usb_mixer_dump_cval;
2698 #ifdef CONFIG_PM
2699 list->resume = restore_mixer_value;
2700 #endif
2701 }
Linux with added FPC-III support