ALSA: usb: Constify snd_kcontrol_new items
[muen/linux.git] / sound / usb / mixer.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *   (Tentative) USB Audio Driver for ALSA
4  *
5  *   Mixer control part
6  *
7  *   Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
8  *
9  *   Many codes borrowed from audio.c by
10  *          Alan Cox (alan@lxorguk.ukuu.org.uk)
11  *          Thomas Sailer (sailer@ife.ee.ethz.ch)
12  */
13
14 /*
15  * TODOs, for both the mixer and the streaming interfaces:
16  *
17  *  - support for UAC2 effect units
18  *  - support for graphical equalizers
19  *  - RANGE and MEM set commands (UAC2)
20  *  - RANGE and MEM interrupt dispatchers (UAC2)
21  *  - audio channel clustering (UAC2)
22  *  - audio sample rate converter units (UAC2)
23  *  - proper handling of clock multipliers (UAC2)
24  *  - dispatch clock change notifications (UAC2)
25  *      - stop PCM streams which use a clock that became invalid
26  *      - stop PCM streams which use a clock selector that has changed
27  *      - parse available sample rates again when clock sources changed
28  */
29
30 #include <linux/bitops.h>
31 #include <linux/init.h>
32 #include <linux/list.h>
33 #include <linux/log2.h>
34 #include <linux/slab.h>
35 #include <linux/string.h>
36 #include <linux/usb.h>
37 #include <linux/usb/audio.h>
38 #include <linux/usb/audio-v2.h>
39 #include <linux/usb/audio-v3.h>
40
41 #include <sound/core.h>
42 #include <sound/control.h>
43 #include <sound/hwdep.h>
44 #include <sound/info.h>
45 #include <sound/tlv.h>
46
47 #include "usbaudio.h"
48 #include "mixer.h"
49 #include "helper.h"
50 #include "mixer_quirks.h"
51 #include "power.h"
52
53 #define MAX_ID_ELEMS    256
54
55 struct usb_audio_term {
56         int id;
57         int type;
58         int channels;
59         unsigned int chconfig;
60         int name;
61 };
62
63 struct usbmix_name_map;
64
65 struct mixer_build {
66         struct snd_usb_audio *chip;
67         struct usb_mixer_interface *mixer;
68         unsigned char *buffer;
69         unsigned int buflen;
70         DECLARE_BITMAP(unitbitmap, MAX_ID_ELEMS);
71         DECLARE_BITMAP(termbitmap, MAX_ID_ELEMS);
72         struct usb_audio_term oterm;
73         const struct usbmix_name_map *map;
74         const struct usbmix_selector_map *selector_map;
75 };
76
77 /*E-mu 0202/0404/0204 eXtension Unit(XU) control*/
78 enum {
79         USB_XU_CLOCK_RATE               = 0xe301,
80         USB_XU_CLOCK_SOURCE             = 0xe302,
81         USB_XU_DIGITAL_IO_STATUS        = 0xe303,
82         USB_XU_DEVICE_OPTIONS           = 0xe304,
83         USB_XU_DIRECT_MONITORING        = 0xe305,
84         USB_XU_METERING                 = 0xe306
85 };
86 enum {
87         USB_XU_CLOCK_SOURCE_SELECTOR = 0x02,    /* clock source*/
88         USB_XU_CLOCK_RATE_SELECTOR = 0x03,      /* clock rate */
89         USB_XU_DIGITAL_FORMAT_SELECTOR = 0x01,  /* the spdif format */
90         USB_XU_SOFT_LIMIT_SELECTOR = 0x03       /* soft limiter */
91 };
92
93 /*
94  * manual mapping of mixer names
95  * if the mixer topology is too complicated and the parsed names are
96  * ambiguous, add the entries in usbmixer_maps.c.
97  */
98 #include "mixer_maps.c"
99
100 static const struct usbmix_name_map *
101 find_map(const struct usbmix_name_map *p, int unitid, int control)
102 {
103         if (!p)
104                 return NULL;
105
106         for (; p->id; p++) {
107                 if (p->id == unitid &&
108                     (!control || !p->control || control == p->control))
109                         return p;
110         }
111         return NULL;
112 }
113
114 /* get the mapped name if the unit matches */
115 static int
116 check_mapped_name(const struct usbmix_name_map *p, char *buf, int buflen)
117 {
118         if (!p || !p->name)
119                 return 0;
120
121         buflen--;
122         return strlcpy(buf, p->name, buflen);
123 }
124
125 /* ignore the error value if ignore_ctl_error flag is set */
126 #define filter_error(cval, err) \
127         ((cval)->head.mixer->ignore_ctl_error ? 0 : (err))
128
129 /* check whether the control should be ignored */
130 static inline int
131 check_ignored_ctl(const struct usbmix_name_map *p)
132 {
133         if (!p || p->name || p->dB)
134                 return 0;
135         return 1;
136 }
137
138 /* dB mapping */
139 static inline void check_mapped_dB(const struct usbmix_name_map *p,
140                                    struct usb_mixer_elem_info *cval)
141 {
142         if (p && p->dB) {
143                 cval->dBmin = p->dB->min;
144                 cval->dBmax = p->dB->max;
145                 cval->initialized = 1;
146         }
147 }
148
149 /* get the mapped selector source name */
150 static int check_mapped_selector_name(struct mixer_build *state, int unitid,
151                                       int index, char *buf, int buflen)
152 {
153         const struct usbmix_selector_map *p;
154
155         if (!state->selector_map)
156                 return 0;
157         for (p = state->selector_map; p->id; p++) {
158                 if (p->id == unitid && index < p->count)
159                         return strlcpy(buf, p->names[index], buflen);
160         }
161         return 0;
162 }
163
164 /*
165  * find an audio control unit with the given unit id
166  */
167 static void *find_audio_control_unit(struct mixer_build *state,
168                                      unsigned char unit)
169 {
170         /* we just parse the header */
171         struct uac_feature_unit_descriptor *hdr = NULL;
172
173         while ((hdr = snd_usb_find_desc(state->buffer, state->buflen, hdr,
174                                         USB_DT_CS_INTERFACE)) != NULL) {
175                 if (hdr->bLength >= 4 &&
176                     hdr->bDescriptorSubtype >= UAC_INPUT_TERMINAL &&
177                     hdr->bDescriptorSubtype <= UAC3_SAMPLE_RATE_CONVERTER &&
178                     hdr->bUnitID == unit)
179                         return hdr;
180         }
181
182         return NULL;
183 }
184
185 /*
186  * copy a string with the given id
187  */
188 static int snd_usb_copy_string_desc(struct snd_usb_audio *chip,
189                                     int index, char *buf, int maxlen)
190 {
191         int len = usb_string(chip->dev, index, buf, maxlen - 1);
192
193         if (len < 0)
194                 return 0;
195
196         buf[len] = 0;
197         return len;
198 }
199
200 /*
201  * convert from the byte/word on usb descriptor to the zero-based integer
202  */
203 static int convert_signed_value(struct usb_mixer_elem_info *cval, int val)
204 {
205         switch (cval->val_type) {
206         case USB_MIXER_BOOLEAN:
207                 return !!val;
208         case USB_MIXER_INV_BOOLEAN:
209                 return !val;
210         case USB_MIXER_U8:
211                 val &= 0xff;
212                 break;
213         case USB_MIXER_S8:
214                 val &= 0xff;
215                 if (val >= 0x80)
216                         val -= 0x100;
217                 break;
218         case USB_MIXER_U16:
219                 val &= 0xffff;
220                 break;
221         case USB_MIXER_S16:
222                 val &= 0xffff;
223                 if (val >= 0x8000)
224                         val -= 0x10000;
225                 break;
226         }
227         return val;
228 }
229
230 /*
231  * convert from the zero-based int to the byte/word for usb descriptor
232  */
233 static int convert_bytes_value(struct usb_mixer_elem_info *cval, int val)
234 {
235         switch (cval->val_type) {
236         case USB_MIXER_BOOLEAN:
237                 return !!val;
238         case USB_MIXER_INV_BOOLEAN:
239                 return !val;
240         case USB_MIXER_S8:
241         case USB_MIXER_U8:
242                 return val & 0xff;
243         case USB_MIXER_S16:
244         case USB_MIXER_U16:
245                 return val & 0xffff;
246         }
247         return 0; /* not reached */
248 }
249
250 static int get_relative_value(struct usb_mixer_elem_info *cval, int val)
251 {
252         if (!cval->res)
253                 cval->res = 1;
254         if (val < cval->min)
255                 return 0;
256         else if (val >= cval->max)
257                 return (cval->max - cval->min + cval->res - 1) / cval->res;
258         else
259                 return (val - cval->min) / cval->res;
260 }
261
262 static int get_abs_value(struct usb_mixer_elem_info *cval, int val)
263 {
264         if (val < 0)
265                 return cval->min;
266         if (!cval->res)
267                 cval->res = 1;
268         val *= cval->res;
269         val += cval->min;
270         if (val > cval->max)
271                 return cval->max;
272         return val;
273 }
274
275 static int uac2_ctl_value_size(int val_type)
276 {
277         switch (val_type) {
278         case USB_MIXER_S32:
279         case USB_MIXER_U32:
280                 return 4;
281         case USB_MIXER_S16:
282         case USB_MIXER_U16:
283                 return 2;
284         default:
285                 return 1;
286         }
287         return 0; /* unreachable */
288 }
289
290
291 /*
292  * retrieve a mixer value
293  */
294
295 static int get_ctl_value_v1(struct usb_mixer_elem_info *cval, int request,
296                             int validx, int *value_ret)
297 {
298         struct snd_usb_audio *chip = cval->head.mixer->chip;
299         unsigned char buf[2];
300         int val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
301         int timeout = 10;
302         int idx = 0, err;
303
304         err = snd_usb_lock_shutdown(chip);
305         if (err < 0)
306                 return -EIO;
307
308         while (timeout-- > 0) {
309                 idx = snd_usb_ctrl_intf(chip) | (cval->head.id << 8);
310                 err = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), request,
311                                       USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
312                                       validx, idx, buf, val_len);
313                 if (err >= val_len) {
314                         *value_ret = convert_signed_value(cval, snd_usb_combine_bytes(buf, val_len));
315                         err = 0;
316                         goto out;
317                 } else if (err == -ETIMEDOUT) {
318                         goto out;
319                 }
320         }
321         usb_audio_dbg(chip,
322                 "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
323                 request, validx, idx, cval->val_type);
324         err = -EINVAL;
325
326  out:
327         snd_usb_unlock_shutdown(chip);
328         return err;
329 }
330
331 static int get_ctl_value_v2(struct usb_mixer_elem_info *cval, int request,
332                             int validx, int *value_ret)
333 {
334         struct snd_usb_audio *chip = cval->head.mixer->chip;
335         /* enough space for one range */
336         unsigned char buf[sizeof(__u16) + 3 * sizeof(__u32)];
337         unsigned char *val;
338         int idx = 0, ret, val_size, size;
339         __u8 bRequest;
340
341         val_size = uac2_ctl_value_size(cval->val_type);
342
343         if (request == UAC_GET_CUR) {
344                 bRequest = UAC2_CS_CUR;
345                 size = val_size;
346         } else {
347                 bRequest = UAC2_CS_RANGE;
348                 size = sizeof(__u16) + 3 * val_size;
349         }
350
351         memset(buf, 0, sizeof(buf));
352
353         ret = snd_usb_lock_shutdown(chip) ? -EIO : 0;
354         if (ret)
355                 goto error;
356
357         idx = snd_usb_ctrl_intf(chip) | (cval->head.id << 8);
358         ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), bRequest,
359                               USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
360                               validx, idx, buf, size);
361         snd_usb_unlock_shutdown(chip);
362
363         if (ret < 0) {
364 error:
365                 usb_audio_err(chip,
366                         "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
367                         request, validx, idx, cval->val_type);
368                 return ret;
369         }
370
371         /* FIXME: how should we handle multiple triplets here? */
372
373         switch (request) {
374         case UAC_GET_CUR:
375                 val = buf;
376                 break;
377         case UAC_GET_MIN:
378                 val = buf + sizeof(__u16);
379                 break;
380         case UAC_GET_MAX:
381                 val = buf + sizeof(__u16) + val_size;
382                 break;
383         case UAC_GET_RES:
384                 val = buf + sizeof(__u16) + val_size * 2;
385                 break;
386         default:
387                 return -EINVAL;
388         }
389
390         *value_ret = convert_signed_value(cval,
391                                           snd_usb_combine_bytes(val, val_size));
392
393         return 0;
394 }
395
396 static int get_ctl_value(struct usb_mixer_elem_info *cval, int request,
397                          int validx, int *value_ret)
398 {
399         validx += cval->idx_off;
400
401         return (cval->head.mixer->protocol == UAC_VERSION_1) ?
402                 get_ctl_value_v1(cval, request, validx, value_ret) :
403                 get_ctl_value_v2(cval, request, validx, value_ret);
404 }
405
406 static int get_cur_ctl_value(struct usb_mixer_elem_info *cval,
407                              int validx, int *value)
408 {
409         return get_ctl_value(cval, UAC_GET_CUR, validx, value);
410 }
411
412 /* channel = 0: master, 1 = first channel */
413 static inline int get_cur_mix_raw(struct usb_mixer_elem_info *cval,
414                                   int channel, int *value)
415 {
416         return get_ctl_value(cval, UAC_GET_CUR,
417                              (cval->control << 8) | channel,
418                              value);
419 }
420
421 int snd_usb_get_cur_mix_value(struct usb_mixer_elem_info *cval,
422                              int channel, int index, int *value)
423 {
424         int err;
425
426         if (cval->cached & (1 << channel)) {
427                 *value = cval->cache_val[index];
428                 return 0;
429         }
430         err = get_cur_mix_raw(cval, channel, value);
431         if (err < 0) {
432                 if (!cval->head.mixer->ignore_ctl_error)
433                         usb_audio_dbg(cval->head.mixer->chip,
434                                 "cannot get current value for control %d ch %d: err = %d\n",
435                                       cval->control, channel, err);
436                 return err;
437         }
438         cval->cached |= 1 << channel;
439         cval->cache_val[index] = *value;
440         return 0;
441 }
442
443 /*
444  * set a mixer value
445  */
446
447 int snd_usb_mixer_set_ctl_value(struct usb_mixer_elem_info *cval,
448                                 int request, int validx, int value_set)
449 {
450         struct snd_usb_audio *chip = cval->head.mixer->chip;
451         unsigned char buf[4];
452         int idx = 0, val_len, err, timeout = 10;
453
454         validx += cval->idx_off;
455
456
457         if (cval->head.mixer->protocol == UAC_VERSION_1) {
458                 val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
459         } else { /* UAC_VERSION_2/3 */
460                 val_len = uac2_ctl_value_size(cval->val_type);
461
462                 /* FIXME */
463                 if (request != UAC_SET_CUR) {
464                         usb_audio_dbg(chip, "RANGE setting not yet supported\n");
465                         return -EINVAL;
466                 }
467
468                 request = UAC2_CS_CUR;
469         }
470
471         value_set = convert_bytes_value(cval, value_set);
472         buf[0] = value_set & 0xff;
473         buf[1] = (value_set >> 8) & 0xff;
474         buf[2] = (value_set >> 16) & 0xff;
475         buf[3] = (value_set >> 24) & 0xff;
476
477         err = snd_usb_lock_shutdown(chip);
478         if (err < 0)
479                 return -EIO;
480
481         while (timeout-- > 0) {
482                 idx = snd_usb_ctrl_intf(chip) | (cval->head.id << 8);
483                 err = snd_usb_ctl_msg(chip->dev,
484                                       usb_sndctrlpipe(chip->dev, 0), request,
485                                       USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
486                                       validx, idx, buf, val_len);
487                 if (err >= 0) {
488                         err = 0;
489                         goto out;
490                 } else if (err == -ETIMEDOUT) {
491                         goto out;
492                 }
493         }
494         usb_audio_dbg(chip, "cannot set ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d, data = %#x/%#x\n",
495                       request, validx, idx, cval->val_type, buf[0], buf[1]);
496         err = -EINVAL;
497
498  out:
499         snd_usb_unlock_shutdown(chip);
500         return err;
501 }
502
503 static int set_cur_ctl_value(struct usb_mixer_elem_info *cval,
504                              int validx, int value)
505 {
506         return snd_usb_mixer_set_ctl_value(cval, UAC_SET_CUR, validx, value);
507 }
508
509 int snd_usb_set_cur_mix_value(struct usb_mixer_elem_info *cval, int channel,
510                              int index, int value)
511 {
512         int err;
513         unsigned int read_only = (channel == 0) ?
514                 cval->master_readonly :
515                 cval->ch_readonly & (1 << (channel - 1));
516
517         if (read_only) {
518                 usb_audio_dbg(cval->head.mixer->chip,
519                               "%s(): channel %d of control %d is read_only\n",
520                             __func__, channel, cval->control);
521                 return 0;
522         }
523
524         err = snd_usb_mixer_set_ctl_value(cval,
525                                           UAC_SET_CUR, (cval->control << 8) | channel,
526                                           value);
527         if (err < 0)
528                 return err;
529         cval->cached |= 1 << channel;
530         cval->cache_val[index] = value;
531         return 0;
532 }
533
534 /*
535  * TLV callback for mixer volume controls
536  */
537 int snd_usb_mixer_vol_tlv(struct snd_kcontrol *kcontrol, int op_flag,
538                          unsigned int size, unsigned int __user *_tlv)
539 {
540         struct usb_mixer_elem_info *cval = kcontrol->private_data;
541         DECLARE_TLV_DB_MINMAX(scale, 0, 0);
542
543         if (size < sizeof(scale))
544                 return -ENOMEM;
545         if (cval->min_mute)
546                 scale[0] = SNDRV_CTL_TLVT_DB_MINMAX_MUTE;
547         scale[2] = cval->dBmin;
548         scale[3] = cval->dBmax;
549         if (copy_to_user(_tlv, scale, sizeof(scale)))
550                 return -EFAULT;
551         return 0;
552 }
553
554 /*
555  * parser routines begin here...
556  */
557
558 static int parse_audio_unit(struct mixer_build *state, int unitid);
559
560
561 /*
562  * check if the input/output channel routing is enabled on the given bitmap.
563  * used for mixer unit parser
564  */
565 static int check_matrix_bitmap(unsigned char *bmap,
566                                int ich, int och, int num_outs)
567 {
568         int idx = ich * num_outs + och;
569         return bmap[idx >> 3] & (0x80 >> (idx & 7));
570 }
571
572 /*
573  * add an alsa control element
574  * search and increment the index until an empty slot is found.
575  *
576  * if failed, give up and free the control instance.
577  */
578
579 int snd_usb_mixer_add_control(struct usb_mixer_elem_list *list,
580                               struct snd_kcontrol *kctl)
581 {
582         struct usb_mixer_interface *mixer = list->mixer;
583         int err;
584
585         while (snd_ctl_find_id(mixer->chip->card, &kctl->id))
586                 kctl->id.index++;
587         err = snd_ctl_add(mixer->chip->card, kctl);
588         if (err < 0) {
589                 usb_audio_dbg(mixer->chip, "cannot add control (err = %d)\n",
590                               err);
591                 return err;
592         }
593         list->kctl = kctl;
594         list->next_id_elem = mixer->id_elems[list->id];
595         mixer->id_elems[list->id] = list;
596         return 0;
597 }
598
599 /*
600  * get a terminal name string
601  */
602
603 static struct iterm_name_combo {
604         int type;
605         char *name;
606 } iterm_names[] = {
607         { 0x0300, "Output" },
608         { 0x0301, "Speaker" },
609         { 0x0302, "Headphone" },
610         { 0x0303, "HMD Audio" },
611         { 0x0304, "Desktop Speaker" },
612         { 0x0305, "Room Speaker" },
613         { 0x0306, "Com Speaker" },
614         { 0x0307, "LFE" },
615         { 0x0600, "External In" },
616         { 0x0601, "Analog In" },
617         { 0x0602, "Digital In" },
618         { 0x0603, "Line" },
619         { 0x0604, "Legacy In" },
620         { 0x0605, "IEC958 In" },
621         { 0x0606, "1394 DA Stream" },
622         { 0x0607, "1394 DV Stream" },
623         { 0x0700, "Embedded" },
624         { 0x0701, "Noise Source" },
625         { 0x0702, "Equalization Noise" },
626         { 0x0703, "CD" },
627         { 0x0704, "DAT" },
628         { 0x0705, "DCC" },
629         { 0x0706, "MiniDisk" },
630         { 0x0707, "Analog Tape" },
631         { 0x0708, "Phonograph" },
632         { 0x0709, "VCR Audio" },
633         { 0x070a, "Video Disk Audio" },
634         { 0x070b, "DVD Audio" },
635         { 0x070c, "TV Tuner Audio" },
636         { 0x070d, "Satellite Rec Audio" },
637         { 0x070e, "Cable Tuner Audio" },
638         { 0x070f, "DSS Audio" },
639         { 0x0710, "Radio Receiver" },
640         { 0x0711, "Radio Transmitter" },
641         { 0x0712, "Multi-Track Recorder" },
642         { 0x0713, "Synthesizer" },
643         { 0 },
644 };
645
646 static int get_term_name(struct snd_usb_audio *chip, struct usb_audio_term *iterm,
647                          unsigned char *name, int maxlen, int term_only)
648 {
649         struct iterm_name_combo *names;
650         int len;
651
652         if (iterm->name) {
653                 len = snd_usb_copy_string_desc(chip, iterm->name,
654                                                 name, maxlen);
655                 if (len)
656                         return len;
657         }
658
659         /* virtual type - not a real terminal */
660         if (iterm->type >> 16) {
661                 if (term_only)
662                         return 0;
663                 switch (iterm->type >> 16) {
664                 case UAC3_SELECTOR_UNIT:
665                         strcpy(name, "Selector");
666                         return 8;
667                 case UAC3_PROCESSING_UNIT:
668                         strcpy(name, "Process Unit");
669                         return 12;
670                 case UAC3_EXTENSION_UNIT:
671                         strcpy(name, "Ext Unit");
672                         return 8;
673                 case UAC3_MIXER_UNIT:
674                         strcpy(name, "Mixer");
675                         return 5;
676                 default:
677                         return sprintf(name, "Unit %d", iterm->id);
678                 }
679         }
680
681         switch (iterm->type & 0xff00) {
682         case 0x0100:
683                 strcpy(name, "PCM");
684                 return 3;
685         case 0x0200:
686                 strcpy(name, "Mic");
687                 return 3;
688         case 0x0400:
689                 strcpy(name, "Headset");
690                 return 7;
691         case 0x0500:
692                 strcpy(name, "Phone");
693                 return 5;
694         }
695
696         for (names = iterm_names; names->type; names++) {
697                 if (names->type == iterm->type) {
698                         strcpy(name, names->name);
699                         return strlen(names->name);
700                 }
701         }
702
703         return 0;
704 }
705
706 /*
707  * Get logical cluster information for UAC3 devices.
708  */
709 static int get_cluster_channels_v3(struct mixer_build *state, unsigned int cluster_id)
710 {
711         struct uac3_cluster_header_descriptor c_header;
712         int err;
713
714         err = snd_usb_ctl_msg(state->chip->dev,
715                         usb_rcvctrlpipe(state->chip->dev, 0),
716                         UAC3_CS_REQ_HIGH_CAPABILITY_DESCRIPTOR,
717                         USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
718                         cluster_id,
719                         snd_usb_ctrl_intf(state->chip),
720                         &c_header, sizeof(c_header));
721         if (err < 0)
722                 goto error;
723         if (err != sizeof(c_header)) {
724                 err = -EIO;
725                 goto error;
726         }
727
728         return c_header.bNrChannels;
729
730 error:
731         usb_audio_err(state->chip, "cannot request logical cluster ID: %d (err: %d)\n", cluster_id, err);
732         return err;
733 }
734
735 /*
736  * Get number of channels for a Mixer Unit.
737  */
738 static int uac_mixer_unit_get_channels(struct mixer_build *state,
739                                        struct uac_mixer_unit_descriptor *desc)
740 {
741         int mu_channels;
742
743         switch (state->mixer->protocol) {
744         case UAC_VERSION_1:
745         case UAC_VERSION_2:
746         default:
747                 if (desc->bLength < sizeof(*desc) + desc->bNrInPins + 1)
748                         return 0; /* no bmControls -> skip */
749                 mu_channels = uac_mixer_unit_bNrChannels(desc);
750                 break;
751         case UAC_VERSION_3:
752                 mu_channels = get_cluster_channels_v3(state,
753                                 uac3_mixer_unit_wClusterDescrID(desc));
754                 break;
755         }
756
757         return mu_channels;
758 }
759
760 /*
761  * Parse Input Terminal Unit
762  */
763 static int __check_input_term(struct mixer_build *state, int id,
764                               struct usb_audio_term *term);
765
766 static int parse_term_uac1_iterm_unit(struct mixer_build *state,
767                                       struct usb_audio_term *term,
768                                       void *p1, int id)
769 {
770         struct uac_input_terminal_descriptor *d = p1;
771
772         term->type = le16_to_cpu(d->wTerminalType);
773         term->channels = d->bNrChannels;
774         term->chconfig = le16_to_cpu(d->wChannelConfig);
775         term->name = d->iTerminal;
776         return 0;
777 }
778
779 static int parse_term_uac2_iterm_unit(struct mixer_build *state,
780                                       struct usb_audio_term *term,
781                                       void *p1, int id)
782 {
783         struct uac2_input_terminal_descriptor *d = p1;
784         int err;
785
786         /* call recursively to verify the referenced clock entity */
787         err = __check_input_term(state, d->bCSourceID, term);
788         if (err < 0)
789                 return err;
790
791         /* save input term properties after recursion,
792          * to ensure they are not overriden by the recursion calls
793          */
794         term->id = id;
795         term->type = le16_to_cpu(d->wTerminalType);
796         term->channels = d->bNrChannels;
797         term->chconfig = le32_to_cpu(d->bmChannelConfig);
798         term->name = d->iTerminal;
799         return 0;
800 }
801
802 static int parse_term_uac3_iterm_unit(struct mixer_build *state,
803                                       struct usb_audio_term *term,
804                                       void *p1, int id)
805 {
806         struct uac3_input_terminal_descriptor *d = p1;
807         int err;
808
809         /* call recursively to verify the referenced clock entity */
810         err = __check_input_term(state, d->bCSourceID, term);
811         if (err < 0)
812                 return err;
813
814         /* save input term properties after recursion,
815          * to ensure they are not overriden by the recursion calls
816          */
817         term->id = id;
818         term->type = le16_to_cpu(d->wTerminalType);
819
820         err = get_cluster_channels_v3(state, le16_to_cpu(d->wClusterDescrID));
821         if (err < 0)
822                 return err;
823         term->channels = err;
824
825         /* REVISIT: UAC3 IT doesn't have channels cfg */
826         term->chconfig = 0;
827
828         term->name = le16_to_cpu(d->wTerminalDescrStr);
829         return 0;
830 }
831
832 static int parse_term_mixer_unit(struct mixer_build *state,
833                                  struct usb_audio_term *term,
834                                  void *p1, int id)
835 {
836         struct uac_mixer_unit_descriptor *d = p1;
837         int protocol = state->mixer->protocol;
838         int err;
839
840         err = uac_mixer_unit_get_channels(state, d);
841         if (err <= 0)
842                 return err;
843
844         term->type = UAC3_MIXER_UNIT << 16; /* virtual type */
845         term->channels = err;
846         if (protocol != UAC_VERSION_3) {
847                 term->chconfig = uac_mixer_unit_wChannelConfig(d, protocol);
848                 term->name = uac_mixer_unit_iMixer(d);
849         }
850         return 0;
851 }
852
853 static int parse_term_selector_unit(struct mixer_build *state,
854                                     struct usb_audio_term *term,
855                                     void *p1, int id)
856 {
857         struct uac_selector_unit_descriptor *d = p1;
858         int err;
859
860         /* call recursively to retrieve the channel info */
861         err = __check_input_term(state, d->baSourceID[0], term);
862         if (err < 0)
863                 return err;
864         term->type = UAC3_SELECTOR_UNIT << 16; /* virtual type */
865         term->id = id;
866         if (state->mixer->protocol != UAC_VERSION_3)
867                 term->name = uac_selector_unit_iSelector(d);
868         return 0;
869 }
870
871 static int parse_term_proc_unit(struct mixer_build *state,
872                                 struct usb_audio_term *term,
873                                 void *p1, int id, int vtype)
874 {
875         struct uac_processing_unit_descriptor *d = p1;
876         int protocol = state->mixer->protocol;
877         int err;
878
879         if (d->bNrInPins) {
880                 /* call recursively to retrieve the channel info */
881                 err = __check_input_term(state, d->baSourceID[0], term);
882                 if (err < 0)
883                         return err;
884         }
885
886         term->type = vtype << 16; /* virtual type */
887         term->id = id;
888
889         if (protocol == UAC_VERSION_3)
890                 return 0;
891
892         if (!term->channels) {
893                 term->channels = uac_processing_unit_bNrChannels(d);
894                 term->chconfig = uac_processing_unit_wChannelConfig(d, protocol);
895         }
896         term->name = uac_processing_unit_iProcessing(d, protocol);
897         return 0;
898 }
899
900 static int parse_term_uac2_clock_source(struct mixer_build *state,
901                                         struct usb_audio_term *term,
902                                         void *p1, int id)
903 {
904         struct uac_clock_source_descriptor *d = p1;
905
906         term->type = UAC3_CLOCK_SOURCE << 16; /* virtual type */
907         term->id = id;
908         term->name = d->iClockSource;
909         return 0;
910 }
911
912 static int parse_term_uac3_clock_source(struct mixer_build *state,
913                                         struct usb_audio_term *term,
914                                         void *p1, int id)
915 {
916         struct uac3_clock_source_descriptor *d = p1;
917
918         term->type = UAC3_CLOCK_SOURCE << 16; /* virtual type */
919         term->id = id;
920         term->name = le16_to_cpu(d->wClockSourceStr);
921         return 0;
922 }
923
924 #define PTYPE(a, b)     ((a) << 8 | (b))
925
926 /*
927  * parse the source unit recursively until it reaches to a terminal
928  * or a branched unit.
929  */
930 static int __check_input_term(struct mixer_build *state, int id,
931                               struct usb_audio_term *term)
932 {
933         int protocol = state->mixer->protocol;
934         void *p1;
935         unsigned char *hdr;
936
937         for (;;) {
938                 /* a loop in the terminal chain? */
939                 if (test_and_set_bit(id, state->termbitmap))
940                         return -EINVAL;
941
942                 p1 = find_audio_control_unit(state, id);
943                 if (!p1)
944                         break;
945                 if (!snd_usb_validate_audio_desc(p1, protocol))
946                         break; /* bad descriptor */
947
948                 hdr = p1;
949                 term->id = id;
950
951                 switch (PTYPE(protocol, hdr[2])) {
952                 case PTYPE(UAC_VERSION_1, UAC_FEATURE_UNIT):
953                 case PTYPE(UAC_VERSION_2, UAC_FEATURE_UNIT):
954                 case PTYPE(UAC_VERSION_3, UAC3_FEATURE_UNIT): {
955                         /* the header is the same for all versions */
956                         struct uac_feature_unit_descriptor *d = p1;
957
958                         id = d->bSourceID;
959                         break; /* continue to parse */
960                 }
961                 case PTYPE(UAC_VERSION_1, UAC_INPUT_TERMINAL):
962                         return parse_term_uac1_iterm_unit(state, term, p1, id);
963                 case PTYPE(UAC_VERSION_2, UAC_INPUT_TERMINAL):
964                         return parse_term_uac2_iterm_unit(state, term, p1, id);
965                 case PTYPE(UAC_VERSION_3, UAC_INPUT_TERMINAL):
966                         return parse_term_uac3_iterm_unit(state, term, p1, id);
967                 case PTYPE(UAC_VERSION_1, UAC_MIXER_UNIT):
968                 case PTYPE(UAC_VERSION_2, UAC_MIXER_UNIT):
969                 case PTYPE(UAC_VERSION_3, UAC3_MIXER_UNIT):
970                         return parse_term_mixer_unit(state, term, p1, id);
971                 case PTYPE(UAC_VERSION_1, UAC_SELECTOR_UNIT):
972                 case PTYPE(UAC_VERSION_2, UAC_SELECTOR_UNIT):
973                 case PTYPE(UAC_VERSION_2, UAC2_CLOCK_SELECTOR):
974                 case PTYPE(UAC_VERSION_3, UAC3_SELECTOR_UNIT):
975                 case PTYPE(UAC_VERSION_3, UAC3_CLOCK_SELECTOR):
976                         return parse_term_selector_unit(state, term, p1, id);
977                 case PTYPE(UAC_VERSION_1, UAC1_PROCESSING_UNIT):
978                 case PTYPE(UAC_VERSION_2, UAC2_PROCESSING_UNIT_V2):
979                 case PTYPE(UAC_VERSION_3, UAC3_PROCESSING_UNIT):
980                         return parse_term_proc_unit(state, term, p1, id,
981                                                     UAC3_PROCESSING_UNIT);
982                 case PTYPE(UAC_VERSION_2, UAC2_EFFECT_UNIT):
983                 case PTYPE(UAC_VERSION_3, UAC3_EFFECT_UNIT):
984                         return parse_term_proc_unit(state, term, p1, id,
985                                                     UAC3_EFFECT_UNIT);
986                 case PTYPE(UAC_VERSION_1, UAC1_EXTENSION_UNIT):
987                 case PTYPE(UAC_VERSION_2, UAC2_EXTENSION_UNIT_V2):
988                 case PTYPE(UAC_VERSION_3, UAC3_EXTENSION_UNIT):
989                         return parse_term_proc_unit(state, term, p1, id,
990                                                     UAC3_EXTENSION_UNIT);
991                 case PTYPE(UAC_VERSION_2, UAC2_CLOCK_SOURCE):
992                         return parse_term_uac2_clock_source(state, term, p1, id);
993                 case PTYPE(UAC_VERSION_3, UAC3_CLOCK_SOURCE):
994                         return parse_term_uac3_clock_source(state, term, p1, id);
995                 default:
996                         return -ENODEV;
997                 }
998         }
999         return -ENODEV;
1000 }
1001
1002
1003 static int check_input_term(struct mixer_build *state, int id,
1004                             struct usb_audio_term *term)
1005 {
1006         memset(term, 0, sizeof(*term));
1007         memset(state->termbitmap, 0, sizeof(state->termbitmap));
1008         return __check_input_term(state, id, term);
1009 }
1010
1011 /*
1012  * Feature Unit
1013  */
1014
1015 /* feature unit control information */
1016 struct usb_feature_control_info {
1017         int control;
1018         const char *name;
1019         int type;       /* data type for uac1 */
1020         int type_uac2;  /* data type for uac2 if different from uac1, else -1 */
1021 };
1022
1023 static struct usb_feature_control_info audio_feature_info[] = {
1024         { UAC_FU_MUTE,                  "Mute",                 USB_MIXER_INV_BOOLEAN, -1 },
1025         { UAC_FU_VOLUME,                "Volume",               USB_MIXER_S16, -1 },
1026         { UAC_FU_BASS,                  "Tone Control - Bass",  USB_MIXER_S8, -1 },
1027         { UAC_FU_MID,                   "Tone Control - Mid",   USB_MIXER_S8, -1 },
1028         { UAC_FU_TREBLE,                "Tone Control - Treble", USB_MIXER_S8, -1 },
1029         { UAC_FU_GRAPHIC_EQUALIZER,     "Graphic Equalizer",    USB_MIXER_S8, -1 }, /* FIXME: not implemented yet */
1030         { UAC_FU_AUTOMATIC_GAIN,        "Auto Gain Control",    USB_MIXER_BOOLEAN, -1 },
1031         { UAC_FU_DELAY,                 "Delay Control",        USB_MIXER_U16, USB_MIXER_U32 },
1032         { UAC_FU_BASS_BOOST,            "Bass Boost",           USB_MIXER_BOOLEAN, -1 },
1033         { UAC_FU_LOUDNESS,              "Loudness",             USB_MIXER_BOOLEAN, -1 },
1034         /* UAC2 specific */
1035         { UAC2_FU_INPUT_GAIN,           "Input Gain Control",   USB_MIXER_S16, -1 },
1036         { UAC2_FU_INPUT_GAIN_PAD,       "Input Gain Pad Control", USB_MIXER_S16, -1 },
1037         { UAC2_FU_PHASE_INVERTER,        "Phase Inverter Control", USB_MIXER_BOOLEAN, -1 },
1038 };
1039
1040 static void usb_mixer_elem_info_free(struct usb_mixer_elem_info *cval)
1041 {
1042         kfree(cval);
1043 }
1044
1045 /* private_free callback */
1046 void snd_usb_mixer_elem_free(struct snd_kcontrol *kctl)
1047 {
1048         usb_mixer_elem_info_free(kctl->private_data);
1049         kctl->private_data = NULL;
1050 }
1051
1052 /*
1053  * interface to ALSA control for feature/mixer units
1054  */
1055
1056 /* volume control quirks */
1057 static void volume_control_quirks(struct usb_mixer_elem_info *cval,
1058                                   struct snd_kcontrol *kctl)
1059 {
1060         struct snd_usb_audio *chip = cval->head.mixer->chip;
1061         switch (chip->usb_id) {
1062         case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
1063         case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
1064                 if (strcmp(kctl->id.name, "Effect Duration") == 0) {
1065                         cval->min = 0x0000;
1066                         cval->max = 0xffff;
1067                         cval->res = 0x00e6;
1068                         break;
1069                 }
1070                 if (strcmp(kctl->id.name, "Effect Volume") == 0 ||
1071                     strcmp(kctl->id.name, "Effect Feedback Volume") == 0) {
1072                         cval->min = 0x00;
1073                         cval->max = 0xff;
1074                         break;
1075                 }
1076                 if (strstr(kctl->id.name, "Effect Return") != NULL) {
1077                         cval->min = 0xb706;
1078                         cval->max = 0xff7b;
1079                         cval->res = 0x0073;
1080                         break;
1081                 }
1082                 if ((strstr(kctl->id.name, "Playback Volume") != NULL) ||
1083                         (strstr(kctl->id.name, "Effect Send") != NULL)) {
1084                         cval->min = 0xb5fb; /* -73 dB = 0xb6ff */
1085                         cval->max = 0xfcfe;
1086                         cval->res = 0x0073;
1087                 }
1088                 break;
1089
1090         case USB_ID(0x0763, 0x2081): /* M-Audio Fast Track Ultra 8R */
1091         case USB_ID(0x0763, 0x2080): /* M-Audio Fast Track Ultra */
1092                 if (strcmp(kctl->id.name, "Effect Duration") == 0) {
1093                         usb_audio_info(chip,
1094                                        "set quirk for FTU Effect Duration\n");
1095                         cval->min = 0x0000;
1096                         cval->max = 0x7f00;
1097                         cval->res = 0x0100;
1098                         break;
1099                 }
1100                 if (strcmp(kctl->id.name, "Effect Volume") == 0 ||
1101                     strcmp(kctl->id.name, "Effect Feedback Volume") == 0) {
1102                         usb_audio_info(chip,
1103                                        "set quirks for FTU Effect Feedback/Volume\n");
1104                         cval->min = 0x00;
1105                         cval->max = 0x7f;
1106                         break;
1107                 }
1108                 break;
1109
1110         case USB_ID(0x0d8c, 0x0103):
1111                 if (!strcmp(kctl->id.name, "PCM Playback Volume")) {
1112                         usb_audio_info(chip,
1113                                  "set volume quirk for CM102-A+/102S+\n");
1114                         cval->min = -256;
1115                 }
1116                 break;
1117
1118         case USB_ID(0x0471, 0x0101):
1119         case USB_ID(0x0471, 0x0104):
1120         case USB_ID(0x0471, 0x0105):
1121         case USB_ID(0x0672, 0x1041):
1122         /* quirk for UDA1321/N101.
1123          * note that detection between firmware 2.1.1.7 (N101)
1124          * and later 2.1.1.21 is not very clear from datasheets.
1125          * I hope that the min value is -15360 for newer firmware --jk
1126          */
1127                 if (!strcmp(kctl->id.name, "PCM Playback Volume") &&
1128                     cval->min == -15616) {
1129                         usb_audio_info(chip,
1130                                  "set volume quirk for UDA1321/N101 chip\n");
1131                         cval->max = -256;
1132                 }
1133                 break;
1134
1135         case USB_ID(0x046d, 0x09a4):
1136                 if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
1137                         usb_audio_info(chip,
1138                                 "set volume quirk for QuickCam E3500\n");
1139                         cval->min = 6080;
1140                         cval->max = 8768;
1141                         cval->res = 192;
1142                 }
1143                 break;
1144
1145         case USB_ID(0x046d, 0x0807): /* Logitech Webcam C500 */
1146         case USB_ID(0x046d, 0x0808):
1147         case USB_ID(0x046d, 0x0809):
1148         case USB_ID(0x046d, 0x0819): /* Logitech Webcam C210 */
1149         case USB_ID(0x046d, 0x081b): /* HD Webcam c310 */
1150         case USB_ID(0x046d, 0x081d): /* HD Webcam c510 */
1151         case USB_ID(0x046d, 0x0825): /* HD Webcam c270 */
1152         case USB_ID(0x046d, 0x0826): /* HD Webcam c525 */
1153         case USB_ID(0x046d, 0x08ca): /* Logitech Quickcam Fusion */
1154         case USB_ID(0x046d, 0x0991):
1155         case USB_ID(0x046d, 0x09a2): /* QuickCam Communicate Deluxe/S7500 */
1156         /* Most audio usb devices lie about volume resolution.
1157          * Most Logitech webcams have res = 384.
1158          * Probably there is some logitech magic behind this number --fishor
1159          */
1160                 if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
1161                         usb_audio_info(chip,
1162                                 "set resolution quirk: cval->res = 384\n");
1163                         cval->res = 384;
1164                 }
1165                 break;
1166         }
1167 }
1168
1169 /*
1170  * retrieve the minimum and maximum values for the specified control
1171  */
1172 static int get_min_max_with_quirks(struct usb_mixer_elem_info *cval,
1173                                    int default_min, struct snd_kcontrol *kctl)
1174 {
1175         /* for failsafe */
1176         cval->min = default_min;
1177         cval->max = cval->min + 1;
1178         cval->res = 1;
1179         cval->dBmin = cval->dBmax = 0;
1180
1181         if (cval->val_type == USB_MIXER_BOOLEAN ||
1182             cval->val_type == USB_MIXER_INV_BOOLEAN) {
1183                 cval->initialized = 1;
1184         } else {
1185                 int minchn = 0;
1186                 if (cval->cmask) {
1187                         int i;
1188                         for (i = 0; i < MAX_CHANNELS; i++)
1189                                 if (cval->cmask & (1 << i)) {
1190                                         minchn = i + 1;
1191                                         break;
1192                                 }
1193                 }
1194                 if (get_ctl_value(cval, UAC_GET_MAX, (cval->control << 8) | minchn, &cval->max) < 0 ||
1195                     get_ctl_value(cval, UAC_GET_MIN, (cval->control << 8) | minchn, &cval->min) < 0) {
1196                         usb_audio_err(cval->head.mixer->chip,
1197                                       "%d:%d: cannot get min/max values for control %d (id %d)\n",
1198                                    cval->head.id, snd_usb_ctrl_intf(cval->head.mixer->chip),
1199                                                                cval->control, cval->head.id);
1200                         return -EINVAL;
1201                 }
1202                 if (get_ctl_value(cval, UAC_GET_RES,
1203                                   (cval->control << 8) | minchn,
1204                                   &cval->res) < 0) {
1205                         cval->res = 1;
1206                 } else {
1207                         int last_valid_res = cval->res;
1208
1209                         while (cval->res > 1) {
1210                                 if (snd_usb_mixer_set_ctl_value(cval, UAC_SET_RES,
1211                                                                 (cval->control << 8) | minchn,
1212                                                                 cval->res / 2) < 0)
1213                                         break;
1214                                 cval->res /= 2;
1215                         }
1216                         if (get_ctl_value(cval, UAC_GET_RES,
1217                                           (cval->control << 8) | minchn, &cval->res) < 0)
1218                                 cval->res = last_valid_res;
1219                 }
1220                 if (cval->res == 0)
1221                         cval->res = 1;
1222
1223                 /* Additional checks for the proper resolution
1224                  *
1225                  * Some devices report smaller resolutions than actually
1226                  * reacting.  They don't return errors but simply clip
1227                  * to the lower aligned value.
1228                  */
1229                 if (cval->min + cval->res < cval->max) {
1230                         int last_valid_res = cval->res;
1231                         int saved, test, check;
1232                         if (get_cur_mix_raw(cval, minchn, &saved) < 0)
1233                                 goto no_res_check;
1234                         for (;;) {
1235                                 test = saved;
1236                                 if (test < cval->max)
1237                                         test += cval->res;
1238                                 else
1239                                         test -= cval->res;
1240                                 if (test < cval->min || test > cval->max ||
1241                                     snd_usb_set_cur_mix_value(cval, minchn, 0, test) ||
1242                                     get_cur_mix_raw(cval, minchn, &check)) {
1243                                         cval->res = last_valid_res;
1244                                         break;
1245                                 }
1246                                 if (test == check)
1247                                         break;
1248                                 cval->res *= 2;
1249                         }
1250                         snd_usb_set_cur_mix_value(cval, minchn, 0, saved);
1251                 }
1252
1253 no_res_check:
1254                 cval->initialized = 1;
1255         }
1256
1257         if (kctl)
1258                 volume_control_quirks(cval, kctl);
1259
1260         /* USB descriptions contain the dB scale in 1/256 dB unit
1261          * while ALSA TLV contains in 1/100 dB unit
1262          */
1263         cval->dBmin = (convert_signed_value(cval, cval->min) * 100) / 256;
1264         cval->dBmax = (convert_signed_value(cval, cval->max) * 100) / 256;
1265         if (cval->dBmin > cval->dBmax) {
1266                 /* something is wrong; assume it's either from/to 0dB */
1267                 if (cval->dBmin < 0)
1268                         cval->dBmax = 0;
1269                 else if (cval->dBmin > 0)
1270                         cval->dBmin = 0;
1271                 if (cval->dBmin > cval->dBmax) {
1272                         /* totally crap, return an error */
1273                         return -EINVAL;
1274                 }
1275         }
1276
1277         return 0;
1278 }
1279
1280 #define get_min_max(cval, def)  get_min_max_with_quirks(cval, def, NULL)
1281
1282 /* get a feature/mixer unit info */
1283 static int mixer_ctl_feature_info(struct snd_kcontrol *kcontrol,
1284                                   struct snd_ctl_elem_info *uinfo)
1285 {
1286         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1287
1288         if (cval->val_type == USB_MIXER_BOOLEAN ||
1289             cval->val_type == USB_MIXER_INV_BOOLEAN)
1290                 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1291         else
1292                 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
1293         uinfo->count = cval->channels;
1294         if (cval->val_type == USB_MIXER_BOOLEAN ||
1295             cval->val_type == USB_MIXER_INV_BOOLEAN) {
1296                 uinfo->value.integer.min = 0;
1297                 uinfo->value.integer.max = 1;
1298         } else {
1299                 if (!cval->initialized) {
1300                         get_min_max_with_quirks(cval, 0, kcontrol);
1301                         if (cval->initialized && cval->dBmin >= cval->dBmax) {
1302                                 kcontrol->vd[0].access &= 
1303                                         ~(SNDRV_CTL_ELEM_ACCESS_TLV_READ |
1304                                           SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK);
1305                                 snd_ctl_notify(cval->head.mixer->chip->card,
1306                                                SNDRV_CTL_EVENT_MASK_INFO,
1307                                                &kcontrol->id);
1308                         }
1309                 }
1310                 uinfo->value.integer.min = 0;
1311                 uinfo->value.integer.max =
1312                         (cval->max - cval->min + cval->res - 1) / cval->res;
1313         }
1314         return 0;
1315 }
1316
1317 /* get the current value from feature/mixer unit */
1318 static int mixer_ctl_feature_get(struct snd_kcontrol *kcontrol,
1319                                  struct snd_ctl_elem_value *ucontrol)
1320 {
1321         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1322         int c, cnt, val, err;
1323
1324         ucontrol->value.integer.value[0] = cval->min;
1325         if (cval->cmask) {
1326                 cnt = 0;
1327                 for (c = 0; c < MAX_CHANNELS; c++) {
1328                         if (!(cval->cmask & (1 << c)))
1329                                 continue;
1330                         err = snd_usb_get_cur_mix_value(cval, c + 1, cnt, &val);
1331                         if (err < 0)
1332                                 return filter_error(cval, err);
1333                         val = get_relative_value(cval, val);
1334                         ucontrol->value.integer.value[cnt] = val;
1335                         cnt++;
1336                 }
1337                 return 0;
1338         } else {
1339                 /* master channel */
1340                 err = snd_usb_get_cur_mix_value(cval, 0, 0, &val);
1341                 if (err < 0)
1342                         return filter_error(cval, err);
1343                 val = get_relative_value(cval, val);
1344                 ucontrol->value.integer.value[0] = val;
1345         }
1346         return 0;
1347 }
1348
1349 /* put the current value to feature/mixer unit */
1350 static int mixer_ctl_feature_put(struct snd_kcontrol *kcontrol,
1351                                  struct snd_ctl_elem_value *ucontrol)
1352 {
1353         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1354         int c, cnt, val, oval, err;
1355         int changed = 0;
1356
1357         if (cval->cmask) {
1358                 cnt = 0;
1359                 for (c = 0; c < MAX_CHANNELS; c++) {
1360                         if (!(cval->cmask & (1 << c)))
1361                                 continue;
1362                         err = snd_usb_get_cur_mix_value(cval, c + 1, cnt, &oval);
1363                         if (err < 0)
1364                                 return filter_error(cval, err);
1365                         val = ucontrol->value.integer.value[cnt];
1366                         val = get_abs_value(cval, val);
1367                         if (oval != val) {
1368                                 snd_usb_set_cur_mix_value(cval, c + 1, cnt, val);
1369                                 changed = 1;
1370                         }
1371                         cnt++;
1372                 }
1373         } else {
1374                 /* master channel */
1375                 err = snd_usb_get_cur_mix_value(cval, 0, 0, &oval);
1376                 if (err < 0)
1377                         return filter_error(cval, err);
1378                 val = ucontrol->value.integer.value[0];
1379                 val = get_abs_value(cval, val);
1380                 if (val != oval) {
1381                         snd_usb_set_cur_mix_value(cval, 0, 0, val);
1382                         changed = 1;
1383                 }
1384         }
1385         return changed;
1386 }
1387
1388 /* get the boolean value from the master channel of a UAC control */
1389 static int mixer_ctl_master_bool_get(struct snd_kcontrol *kcontrol,
1390                                      struct snd_ctl_elem_value *ucontrol)
1391 {
1392         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1393         int val, err;
1394
1395         err = snd_usb_get_cur_mix_value(cval, 0, 0, &val);
1396         if (err < 0)
1397                 return filter_error(cval, err);
1398         val = (val != 0);
1399         ucontrol->value.integer.value[0] = val;
1400         return 0;
1401 }
1402
1403 /* get the connectors status and report it as boolean type */
1404 static int mixer_ctl_connector_get(struct snd_kcontrol *kcontrol,
1405                                    struct snd_ctl_elem_value *ucontrol)
1406 {
1407         struct usb_mixer_elem_info *cval = kcontrol->private_data;
1408         struct snd_usb_audio *chip = cval->head.mixer->chip;
1409         int idx = 0, validx, ret, val;
1410
1411         validx = cval->control << 8 | 0;
1412
1413         ret = snd_usb_lock_shutdown(chip) ? -EIO : 0;
1414         if (ret)
1415                 goto error;
1416
1417         idx = snd_usb_ctrl_intf(chip) | (cval->head.id << 8);
1418         if (cval->head.mixer->protocol == UAC_VERSION_2) {
1419                 struct uac2_connectors_ctl_blk uac2_conn;
1420
1421                 ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), UAC2_CS_CUR,
1422                                       USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
1423                                       validx, idx, &uac2_conn, sizeof(uac2_conn));
1424                 val = !!uac2_conn.bNrChannels;
1425         } else { /* UAC_VERSION_3 */
1426                 struct uac3_insertion_ctl_blk uac3_conn;
1427
1428                 ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0), UAC2_CS_CUR,
1429                                       USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
1430                                       validx, idx, &uac3_conn, sizeof(uac3_conn));
1431                 val = !!uac3_conn.bmConInserted;
1432         }
1433
1434         snd_usb_unlock_shutdown(chip);
1435
1436         if (ret < 0) {
1437 error:
1438                 usb_audio_err(chip,
1439                         "cannot get connectors status: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
1440                         UAC_GET_CUR, validx, idx, cval->val_type);
1441                 return ret;
1442         }
1443
1444         ucontrol->value.integer.value[0] = val;
1445         return 0;
1446 }
1447
1448 static const struct snd_kcontrol_new usb_feature_unit_ctl = {
1449         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1450         .name = "", /* will be filled later manually */
1451         .info = mixer_ctl_feature_info,
1452         .get = mixer_ctl_feature_get,
1453         .put = mixer_ctl_feature_put,
1454 };
1455
1456 /* the read-only variant */
1457 static const struct snd_kcontrol_new usb_feature_unit_ctl_ro = {
1458         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1459         .name = "", /* will be filled later manually */
1460         .info = mixer_ctl_feature_info,
1461         .get = mixer_ctl_feature_get,
1462         .put = NULL,
1463 };
1464
1465 /*
1466  * A control which shows the boolean value from reading a UAC control on
1467  * the master channel.
1468  */
1469 static const struct snd_kcontrol_new usb_bool_master_control_ctl_ro = {
1470         .iface = SNDRV_CTL_ELEM_IFACE_CARD,
1471         .name = "", /* will be filled later manually */
1472         .access = SNDRV_CTL_ELEM_ACCESS_READ,
1473         .info = snd_ctl_boolean_mono_info,
1474         .get = mixer_ctl_master_bool_get,
1475         .put = NULL,
1476 };
1477
1478 static const struct snd_kcontrol_new usb_connector_ctl_ro = {
1479         .iface = SNDRV_CTL_ELEM_IFACE_CARD,
1480         .name = "", /* will be filled later manually */
1481         .access = SNDRV_CTL_ELEM_ACCESS_READ,
1482         .info = snd_ctl_boolean_mono_info,
1483         .get = mixer_ctl_connector_get,
1484         .put = NULL,
1485 };
1486
1487 /*
1488  * This symbol is exported in order to allow the mixer quirks to
1489  * hook up to the standard feature unit control mechanism
1490  */
1491 const struct snd_kcontrol_new *snd_usb_feature_unit_ctl = &usb_feature_unit_ctl;
1492
1493 /*
1494  * build a feature control
1495  */
1496 static size_t append_ctl_name(struct snd_kcontrol *kctl, const char *str)
1497 {
1498         return strlcat(kctl->id.name, str, sizeof(kctl->id.name));
1499 }
1500
1501 /*
1502  * A lot of headsets/headphones have a "Speaker" mixer. Make sure we
1503  * rename it to "Headphone". We determine if something is a headphone
1504  * similar to how udev determines form factor.
1505  */
1506 static void check_no_speaker_on_headset(struct snd_kcontrol *kctl,
1507                                         struct snd_card *card)
1508 {
1509         const char *names_to_check[] = {
1510                 "Headset", "headset", "Headphone", "headphone", NULL};
1511         const char **s;
1512         bool found = false;
1513
1514         if (strcmp("Speaker", kctl->id.name))
1515                 return;
1516
1517         for (s = names_to_check; *s; s++)
1518                 if (strstr(card->shortname, *s)) {
1519                         found = true;
1520                         break;
1521                 }
1522
1523         if (!found)
1524                 return;
1525
1526         strlcpy(kctl->id.name, "Headphone", sizeof(kctl->id.name));
1527 }
1528
1529 static struct usb_feature_control_info *get_feature_control_info(int control)
1530 {
1531         int i;
1532
1533         for (i = 0; i < ARRAY_SIZE(audio_feature_info); ++i) {
1534                 if (audio_feature_info[i].control == control)
1535                         return &audio_feature_info[i];
1536         }
1537         return NULL;
1538 }
1539
1540 static void __build_feature_ctl(struct usb_mixer_interface *mixer,
1541                                 const struct usbmix_name_map *imap,
1542                                 unsigned int ctl_mask, int control,
1543                                 struct usb_audio_term *iterm,
1544                                 struct usb_audio_term *oterm,
1545                                 int unitid, int nameid, int readonly_mask)
1546 {
1547         struct usb_feature_control_info *ctl_info;
1548         unsigned int len = 0;
1549         int mapped_name = 0;
1550         struct snd_kcontrol *kctl;
1551         struct usb_mixer_elem_info *cval;
1552         const struct usbmix_name_map *map;
1553         unsigned int range;
1554
1555         if (control == UAC_FU_GRAPHIC_EQUALIZER) {
1556                 /* FIXME: not supported yet */
1557                 return;
1558         }
1559
1560         map = find_map(imap, unitid, control);
1561         if (check_ignored_ctl(map))
1562                 return;
1563
1564         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1565         if (!cval)
1566                 return;
1567         snd_usb_mixer_elem_init_std(&cval->head, mixer, unitid);
1568         cval->control = control;
1569         cval->cmask = ctl_mask;
1570
1571         ctl_info = get_feature_control_info(control);
1572         if (!ctl_info) {
1573                 usb_mixer_elem_info_free(cval);
1574                 return;
1575         }
1576         if (mixer->protocol == UAC_VERSION_1)
1577                 cval->val_type = ctl_info->type;
1578         else /* UAC_VERSION_2 */
1579                 cval->val_type = ctl_info->type_uac2 >= 0 ?
1580                         ctl_info->type_uac2 : ctl_info->type;
1581
1582         if (ctl_mask == 0) {
1583                 cval->channels = 1;     /* master channel */
1584                 cval->master_readonly = readonly_mask;
1585         } else {
1586                 int i, c = 0;
1587                 for (i = 0; i < 16; i++)
1588                         if (ctl_mask & (1 << i))
1589                                 c++;
1590                 cval->channels = c;
1591                 cval->ch_readonly = readonly_mask;
1592         }
1593
1594         /*
1595          * If all channels in the mask are marked read-only, make the control
1596          * read-only. snd_usb_set_cur_mix_value() will check the mask again and won't
1597          * issue write commands to read-only channels.
1598          */
1599         if (cval->channels == readonly_mask)
1600                 kctl = snd_ctl_new1(&usb_feature_unit_ctl_ro, cval);
1601         else
1602                 kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
1603
1604         if (!kctl) {
1605                 usb_audio_err(mixer->chip, "cannot malloc kcontrol\n");
1606                 usb_mixer_elem_info_free(cval);
1607                 return;
1608         }
1609         kctl->private_free = snd_usb_mixer_elem_free;
1610
1611         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
1612         mapped_name = len != 0;
1613         if (!len && nameid)
1614                 len = snd_usb_copy_string_desc(mixer->chip, nameid,
1615                                 kctl->id.name, sizeof(kctl->id.name));
1616
1617         switch (control) {
1618         case UAC_FU_MUTE:
1619         case UAC_FU_VOLUME:
1620                 /*
1621                  * determine the control name.  the rule is:
1622                  * - if a name id is given in descriptor, use it.
1623                  * - if the connected input can be determined, then use the name
1624                  *   of terminal type.
1625                  * - if the connected output can be determined, use it.
1626                  * - otherwise, anonymous name.
1627                  */
1628                 if (!len) {
1629                         if (iterm)
1630                                 len = get_term_name(mixer->chip, iterm,
1631                                                     kctl->id.name,
1632                                                     sizeof(kctl->id.name), 1);
1633                         if (!len && oterm)
1634                                 len = get_term_name(mixer->chip, oterm,
1635                                                     kctl->id.name,
1636                                                     sizeof(kctl->id.name), 1);
1637                         if (!len)
1638                                 snprintf(kctl->id.name, sizeof(kctl->id.name),
1639                                          "Feature %d", unitid);
1640                 }
1641
1642                 if (!mapped_name)
1643                         check_no_speaker_on_headset(kctl, mixer->chip->card);
1644
1645                 /*
1646                  * determine the stream direction:
1647                  * if the connected output is USB stream, then it's likely a
1648                  * capture stream.  otherwise it should be playback (hopefully :)
1649                  */
1650                 if (!mapped_name && oterm && !(oterm->type >> 16)) {
1651                         if ((oterm->type & 0xff00) == 0x0100)
1652                                 append_ctl_name(kctl, " Capture");
1653                         else
1654                                 append_ctl_name(kctl, " Playback");
1655                 }
1656                 append_ctl_name(kctl, control == UAC_FU_MUTE ?
1657                                 " Switch" : " Volume");
1658                 break;
1659         default:
1660                 if (!len)
1661                         strlcpy(kctl->id.name, audio_feature_info[control-1].name,
1662                                 sizeof(kctl->id.name));
1663                 break;
1664         }
1665
1666         /* get min/max values */
1667         get_min_max_with_quirks(cval, 0, kctl);
1668
1669         if (control == UAC_FU_VOLUME) {
1670                 check_mapped_dB(map, cval);
1671                 if (cval->dBmin < cval->dBmax || !cval->initialized) {
1672                         kctl->tlv.c = snd_usb_mixer_vol_tlv;
1673                         kctl->vd[0].access |=
1674                                 SNDRV_CTL_ELEM_ACCESS_TLV_READ |
1675                                 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK;
1676                 }
1677         }
1678
1679         snd_usb_mixer_fu_apply_quirk(mixer, cval, unitid, kctl);
1680
1681         range = (cval->max - cval->min) / cval->res;
1682         /*
1683          * Are there devices with volume range more than 255? I use a bit more
1684          * to be sure. 384 is a resolution magic number found on Logitech
1685          * devices. It will definitively catch all buggy Logitech devices.
1686          */
1687         if (range > 384) {
1688                 usb_audio_warn(mixer->chip,
1689                                "Warning! Unlikely big volume range (=%u), cval->res is probably wrong.",
1690                                range);
1691                 usb_audio_warn(mixer->chip,
1692                                "[%d] FU [%s] ch = %d, val = %d/%d/%d",
1693                                cval->head.id, kctl->id.name, cval->channels,
1694                                cval->min, cval->max, cval->res);
1695         }
1696
1697         usb_audio_dbg(mixer->chip, "[%d] FU [%s] ch = %d, val = %d/%d/%d\n",
1698                       cval->head.id, kctl->id.name, cval->channels,
1699                       cval->min, cval->max, cval->res);
1700         snd_usb_mixer_add_control(&cval->head, kctl);
1701 }
1702
1703 static void build_feature_ctl(struct mixer_build *state, void *raw_desc,
1704                               unsigned int ctl_mask, int control,
1705                               struct usb_audio_term *iterm, int unitid,
1706                               int readonly_mask)
1707 {
1708         struct uac_feature_unit_descriptor *desc = raw_desc;
1709         int nameid = uac_feature_unit_iFeature(desc);
1710
1711         __build_feature_ctl(state->mixer, state->map, ctl_mask, control,
1712                         iterm, &state->oterm, unitid, nameid, readonly_mask);
1713 }
1714
1715 static void build_feature_ctl_badd(struct usb_mixer_interface *mixer,
1716                               unsigned int ctl_mask, int control, int unitid,
1717                               const struct usbmix_name_map *badd_map)
1718 {
1719         __build_feature_ctl(mixer, badd_map, ctl_mask, control,
1720                         NULL, NULL, unitid, 0, 0);
1721 }
1722
1723 static void get_connector_control_name(struct usb_mixer_interface *mixer,
1724                                        struct usb_audio_term *term,
1725                                        bool is_input, char *name, int name_size)
1726 {
1727         int name_len = get_term_name(mixer->chip, term, name, name_size, 0);
1728
1729         if (name_len == 0)
1730                 strlcpy(name, "Unknown", name_size);
1731
1732         /*
1733          *  sound/core/ctljack.c has a convention of naming jack controls
1734          * by ending in " Jack".  Make it slightly more useful by
1735          * indicating Input or Output after the terminal name.
1736          */
1737         if (is_input)
1738                 strlcat(name, " - Input Jack", name_size);
1739         else
1740                 strlcat(name, " - Output Jack", name_size);
1741 }
1742
1743 /* Build a mixer control for a UAC connector control (jack-detect) */
1744 static void build_connector_control(struct usb_mixer_interface *mixer,
1745                                     struct usb_audio_term *term, bool is_input)
1746 {
1747         struct snd_kcontrol *kctl;
1748         struct usb_mixer_elem_info *cval;
1749
1750         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1751         if (!cval)
1752                 return;
1753         snd_usb_mixer_elem_init_std(&cval->head, mixer, term->id);
1754         /*
1755          * UAC2: The first byte from reading the UAC2_TE_CONNECTOR control returns the
1756          * number of channels connected.
1757          *
1758          * UAC3: The first byte specifies size of bitmap for the inserted controls. The
1759          * following byte(s) specifies which connectors are inserted.
1760          *
1761          * This boolean ctl will simply report if any channels are connected
1762          * or not.
1763          */
1764         if (mixer->protocol == UAC_VERSION_2)
1765                 cval->control = UAC2_TE_CONNECTOR;
1766         else /* UAC_VERSION_3 */
1767                 cval->control = UAC3_TE_INSERTION;
1768
1769         cval->val_type = USB_MIXER_BOOLEAN;
1770         cval->channels = 1; /* report true if any channel is connected */
1771         cval->min = 0;
1772         cval->max = 1;
1773         kctl = snd_ctl_new1(&usb_connector_ctl_ro, cval);
1774         if (!kctl) {
1775                 usb_audio_err(mixer->chip, "cannot malloc kcontrol\n");
1776                 usb_mixer_elem_info_free(cval);
1777                 return;
1778         }
1779         get_connector_control_name(mixer, term, is_input, kctl->id.name,
1780                                    sizeof(kctl->id.name));
1781         kctl->private_free = snd_usb_mixer_elem_free;
1782         snd_usb_mixer_add_control(&cval->head, kctl);
1783 }
1784
1785 static int parse_clock_source_unit(struct mixer_build *state, int unitid,
1786                                    void *_ftr)
1787 {
1788         struct uac_clock_source_descriptor *hdr = _ftr;
1789         struct usb_mixer_elem_info *cval;
1790         struct snd_kcontrol *kctl;
1791         char name[SNDRV_CTL_ELEM_ID_NAME_MAXLEN];
1792         int ret;
1793
1794         if (state->mixer->protocol != UAC_VERSION_2)
1795                 return -EINVAL;
1796
1797         /*
1798          * The only property of this unit we are interested in is the
1799          * clock source validity. If that isn't readable, just bail out.
1800          */
1801         if (!uac_v2v3_control_is_readable(hdr->bmControls,
1802                                       UAC2_CS_CONTROL_CLOCK_VALID))
1803                 return 0;
1804
1805         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
1806         if (!cval)
1807                 return -ENOMEM;
1808
1809         snd_usb_mixer_elem_init_std(&cval->head, state->mixer, hdr->bClockID);
1810
1811         cval->min = 0;
1812         cval->max = 1;
1813         cval->channels = 1;
1814         cval->val_type = USB_MIXER_BOOLEAN;
1815         cval->control = UAC2_CS_CONTROL_CLOCK_VALID;
1816
1817         cval->master_readonly = 1;
1818         /* From UAC2 5.2.5.1.2 "Only the get request is supported." */
1819         kctl = snd_ctl_new1(&usb_bool_master_control_ctl_ro, cval);
1820
1821         if (!kctl) {
1822                 usb_mixer_elem_info_free(cval);
1823                 return -ENOMEM;
1824         }
1825
1826         kctl->private_free = snd_usb_mixer_elem_free;
1827         ret = snd_usb_copy_string_desc(state->chip, hdr->iClockSource,
1828                                        name, sizeof(name));
1829         if (ret > 0)
1830                 snprintf(kctl->id.name, sizeof(kctl->id.name),
1831                          "%s Validity", name);
1832         else
1833                 snprintf(kctl->id.name, sizeof(kctl->id.name),
1834                          "Clock Source %d Validity", hdr->bClockID);
1835
1836         return snd_usb_mixer_add_control(&cval->head, kctl);
1837 }
1838
1839 /*
1840  * parse a feature unit
1841  *
1842  * most of controls are defined here.
1843  */
1844 static int parse_audio_feature_unit(struct mixer_build *state, int unitid,
1845                                     void *_ftr)
1846 {
1847         int channels, i, j;
1848         struct usb_audio_term iterm;
1849         unsigned int master_bits;
1850         int err, csize;
1851         struct uac_feature_unit_descriptor *hdr = _ftr;
1852         __u8 *bmaControls;
1853
1854         if (state->mixer->protocol == UAC_VERSION_1) {
1855                 csize = hdr->bControlSize;
1856                 channels = (hdr->bLength - 7) / csize - 1;
1857                 bmaControls = hdr->bmaControls;
1858         } else if (state->mixer->protocol == UAC_VERSION_2) {
1859                 struct uac2_feature_unit_descriptor *ftr = _ftr;
1860                 csize = 4;
1861                 channels = (hdr->bLength - 6) / 4 - 1;
1862                 bmaControls = ftr->bmaControls;
1863         } else { /* UAC_VERSION_3 */
1864                 struct uac3_feature_unit_descriptor *ftr = _ftr;
1865
1866                 csize = 4;
1867                 channels = (ftr->bLength - 7) / 4 - 1;
1868                 bmaControls = ftr->bmaControls;
1869         }
1870
1871         /* parse the source unit */
1872         err = parse_audio_unit(state, hdr->bSourceID);
1873         if (err < 0)
1874                 return err;
1875
1876         /* determine the input source type and name */
1877         err = check_input_term(state, hdr->bSourceID, &iterm);
1878         if (err < 0)
1879                 return err;
1880
1881         master_bits = snd_usb_combine_bytes(bmaControls, csize);
1882         /* master configuration quirks */
1883         switch (state->chip->usb_id) {
1884         case USB_ID(0x08bb, 0x2702):
1885                 usb_audio_info(state->chip,
1886                                "usbmixer: master volume quirk for PCM2702 chip\n");
1887                 /* disable non-functional volume control */
1888                 master_bits &= ~UAC_CONTROL_BIT(UAC_FU_VOLUME);
1889                 break;
1890         case USB_ID(0x1130, 0xf211):
1891                 usb_audio_info(state->chip,
1892                                "usbmixer: volume control quirk for Tenx TP6911 Audio Headset\n");
1893                 /* disable non-functional volume control */
1894                 channels = 0;
1895                 break;
1896
1897         }
1898
1899         if (state->mixer->protocol == UAC_VERSION_1) {
1900                 /* check all control types */
1901                 for (i = 0; i < 10; i++) {
1902                         unsigned int ch_bits = 0;
1903                         int control = audio_feature_info[i].control;
1904
1905                         for (j = 0; j < channels; j++) {
1906                                 unsigned int mask;
1907
1908                                 mask = snd_usb_combine_bytes(bmaControls +
1909                                                              csize * (j+1), csize);
1910                                 if (mask & (1 << i))
1911                                         ch_bits |= (1 << j);
1912                         }
1913                         /* audio class v1 controls are never read-only */
1914
1915                         /*
1916                          * The first channel must be set
1917                          * (for ease of programming).
1918                          */
1919                         if (ch_bits & 1)
1920                                 build_feature_ctl(state, _ftr, ch_bits, control,
1921                                                   &iterm, unitid, 0);
1922                         if (master_bits & (1 << i))
1923                                 build_feature_ctl(state, _ftr, 0, control,
1924                                                   &iterm, unitid, 0);
1925                 }
1926         } else { /* UAC_VERSION_2/3 */
1927                 for (i = 0; i < ARRAY_SIZE(audio_feature_info); i++) {
1928                         unsigned int ch_bits = 0;
1929                         unsigned int ch_read_only = 0;
1930                         int control = audio_feature_info[i].control;
1931
1932                         for (j = 0; j < channels; j++) {
1933                                 unsigned int mask;
1934
1935                                 mask = snd_usb_combine_bytes(bmaControls +
1936                                                              csize * (j+1), csize);
1937                                 if (uac_v2v3_control_is_readable(mask, control)) {
1938                                         ch_bits |= (1 << j);
1939                                         if (!uac_v2v3_control_is_writeable(mask, control))
1940                                                 ch_read_only |= (1 << j);
1941                                 }
1942                         }
1943
1944                         /*
1945                          * NOTE: build_feature_ctl() will mark the control
1946                          * read-only if all channels are marked read-only in
1947                          * the descriptors. Otherwise, the control will be
1948                          * reported as writeable, but the driver will not
1949                          * actually issue a write command for read-only
1950                          * channels.
1951                          */
1952
1953                         /*
1954                          * The first channel must be set
1955                          * (for ease of programming).
1956                          */
1957                         if (ch_bits & 1)
1958                                 build_feature_ctl(state, _ftr, ch_bits, control,
1959                                                   &iterm, unitid, ch_read_only);
1960                         if (uac_v2v3_control_is_readable(master_bits, control))
1961                                 build_feature_ctl(state, _ftr, 0, control,
1962                                                   &iterm, unitid,
1963                                                   !uac_v2v3_control_is_writeable(master_bits,
1964                                                                                  control));
1965                 }
1966         }
1967
1968         return 0;
1969 }
1970
1971 /*
1972  * Mixer Unit
1973  */
1974
1975 /* check whether the given in/out overflows bmMixerControls matrix */
1976 static bool mixer_bitmap_overflow(struct uac_mixer_unit_descriptor *desc,
1977                                   int protocol, int num_ins, int num_outs)
1978 {
1979         u8 *hdr = (u8 *)desc;
1980         u8 *c = uac_mixer_unit_bmControls(desc, protocol);
1981         size_t rest; /* remaining bytes after bmMixerControls */
1982
1983         switch (protocol) {
1984         case UAC_VERSION_1:
1985         default:
1986                 rest = 1; /* iMixer */
1987                 break;
1988         case UAC_VERSION_2:
1989                 rest = 2; /* bmControls + iMixer */
1990                 break;
1991         case UAC_VERSION_3:
1992                 rest = 6; /* bmControls + wMixerDescrStr */
1993                 break;
1994         }
1995
1996         /* overflow? */
1997         return c + (num_ins * num_outs + 7) / 8 + rest > hdr + hdr[0];
1998 }
1999
2000 /*
2001  * build a mixer unit control
2002  *
2003  * the callbacks are identical with feature unit.
2004  * input channel number (zero based) is given in control field instead.
2005  */
2006 static void build_mixer_unit_ctl(struct mixer_build *state,
2007                                  struct uac_mixer_unit_descriptor *desc,
2008                                  int in_pin, int in_ch, int num_outs,
2009                                  int unitid, struct usb_audio_term *iterm)
2010 {
2011         struct usb_mixer_elem_info *cval;
2012         unsigned int i, len;
2013         struct snd_kcontrol *kctl;
2014         const struct usbmix_name_map *map;
2015
2016         map = find_map(state->map, unitid, 0);
2017         if (check_ignored_ctl(map))
2018                 return;
2019
2020         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
2021         if (!cval)
2022                 return;
2023
2024         snd_usb_mixer_elem_init_std(&cval->head, state->mixer, unitid);
2025         cval->control = in_ch + 1; /* based on 1 */
2026         cval->val_type = USB_MIXER_S16;
2027         for (i = 0; i < num_outs; i++) {
2028                 __u8 *c = uac_mixer_unit_bmControls(desc, state->mixer->protocol);
2029
2030                 if (check_matrix_bitmap(c, in_ch, i, num_outs)) {
2031                         cval->cmask |= (1 << i);
2032                         cval->channels++;
2033                 }
2034         }
2035
2036         /* get min/max values */
2037         get_min_max(cval, 0);
2038
2039         kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
2040         if (!kctl) {
2041                 usb_audio_err(state->chip, "cannot malloc kcontrol\n");
2042                 usb_mixer_elem_info_free(cval);
2043                 return;
2044         }
2045         kctl->private_free = snd_usb_mixer_elem_free;
2046
2047         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
2048         if (!len)
2049                 len = get_term_name(state->chip, iterm, kctl->id.name,
2050                                     sizeof(kctl->id.name), 0);
2051         if (!len)
2052                 len = sprintf(kctl->id.name, "Mixer Source %d", in_ch + 1);
2053         append_ctl_name(kctl, " Volume");
2054
2055         usb_audio_dbg(state->chip, "[%d] MU [%s] ch = %d, val = %d/%d\n",
2056                     cval->head.id, kctl->id.name, cval->channels, cval->min, cval->max);
2057         snd_usb_mixer_add_control(&cval->head, kctl);
2058 }
2059
2060 static int parse_audio_input_terminal(struct mixer_build *state, int unitid,
2061                                       void *raw_desc)
2062 {
2063         struct usb_audio_term iterm;
2064         unsigned int control, bmctls, term_id;
2065
2066         if (state->mixer->protocol == UAC_VERSION_2) {
2067                 struct uac2_input_terminal_descriptor *d_v2 = raw_desc;
2068                 control = UAC2_TE_CONNECTOR;
2069                 term_id = d_v2->bTerminalID;
2070                 bmctls = le16_to_cpu(d_v2->bmControls);
2071         } else if (state->mixer->protocol == UAC_VERSION_3) {
2072                 struct uac3_input_terminal_descriptor *d_v3 = raw_desc;
2073                 control = UAC3_TE_INSERTION;
2074                 term_id = d_v3->bTerminalID;
2075                 bmctls = le32_to_cpu(d_v3->bmControls);
2076         } else {
2077                 return 0; /* UAC1. No Insertion control */
2078         }
2079
2080         check_input_term(state, term_id, &iterm);
2081
2082         /* Check for jack detection. */
2083         if (uac_v2v3_control_is_readable(bmctls, control))
2084                 build_connector_control(state->mixer, &iterm, true);
2085
2086         return 0;
2087 }
2088
2089 /*
2090  * parse a mixer unit
2091  */
2092 static int parse_audio_mixer_unit(struct mixer_build *state, int unitid,
2093                                   void *raw_desc)
2094 {
2095         struct uac_mixer_unit_descriptor *desc = raw_desc;
2096         struct usb_audio_term iterm;
2097         int input_pins, num_ins, num_outs;
2098         int pin, ich, err;
2099
2100         err = uac_mixer_unit_get_channels(state, desc);
2101         if (err < 0) {
2102                 usb_audio_err(state->chip,
2103                               "invalid MIXER UNIT descriptor %d\n",
2104                               unitid);
2105                 return err;
2106         }
2107
2108         num_outs = err;
2109         input_pins = desc->bNrInPins;
2110
2111         num_ins = 0;
2112         ich = 0;
2113         for (pin = 0; pin < input_pins; pin++) {
2114                 err = parse_audio_unit(state, desc->baSourceID[pin]);
2115                 if (err < 0)
2116                         continue;
2117                 /* no bmControls field (e.g. Maya44) -> ignore */
2118                 if (!num_outs)
2119                         continue;
2120                 err = check_input_term(state, desc->baSourceID[pin], &iterm);
2121                 if (err < 0)
2122                         return err;
2123                 num_ins += iterm.channels;
2124                 if (mixer_bitmap_overflow(desc, state->mixer->protocol,
2125                                           num_ins, num_outs))
2126                         break;
2127                 for (; ich < num_ins; ich++) {
2128                         int och, ich_has_controls = 0;
2129
2130                         for (och = 0; och < num_outs; och++) {
2131                                 __u8 *c = uac_mixer_unit_bmControls(desc,
2132                                                 state->mixer->protocol);
2133
2134                                 if (check_matrix_bitmap(c, ich, och, num_outs)) {
2135                                         ich_has_controls = 1;
2136                                         break;
2137                                 }
2138                         }
2139                         if (ich_has_controls)
2140                                 build_mixer_unit_ctl(state, desc, pin, ich, num_outs,
2141                                                      unitid, &iterm);
2142                 }
2143         }
2144         return 0;
2145 }
2146
2147 /*
2148  * Processing Unit / Extension Unit
2149  */
2150
2151 /* get callback for processing/extension unit */
2152 static int mixer_ctl_procunit_get(struct snd_kcontrol *kcontrol,
2153                                   struct snd_ctl_elem_value *ucontrol)
2154 {
2155         struct usb_mixer_elem_info *cval = kcontrol->private_data;
2156         int err, val;
2157
2158         err = get_cur_ctl_value(cval, cval->control << 8, &val);
2159         if (err < 0) {
2160                 ucontrol->value.integer.value[0] = cval->min;
2161                 return filter_error(cval, err);
2162         }
2163         val = get_relative_value(cval, val);
2164         ucontrol->value.integer.value[0] = val;
2165         return 0;
2166 }
2167
2168 /* put callback for processing/extension unit */
2169 static int mixer_ctl_procunit_put(struct snd_kcontrol *kcontrol,
2170                                   struct snd_ctl_elem_value *ucontrol)
2171 {
2172         struct usb_mixer_elem_info *cval = kcontrol->private_data;
2173         int val, oval, err;
2174
2175         err = get_cur_ctl_value(cval, cval->control << 8, &oval);
2176         if (err < 0)
2177                 return filter_error(cval, err);
2178         val = ucontrol->value.integer.value[0];
2179         val = get_abs_value(cval, val);
2180         if (val != oval) {
2181                 set_cur_ctl_value(cval, cval->control << 8, val);
2182                 return 1;
2183         }
2184         return 0;
2185 }
2186
2187 /* alsa control interface for processing/extension unit */
2188 static const struct snd_kcontrol_new mixer_procunit_ctl = {
2189         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
2190         .name = "", /* will be filled later */
2191         .info = mixer_ctl_feature_info,
2192         .get = mixer_ctl_procunit_get,
2193         .put = mixer_ctl_procunit_put,
2194 };
2195
2196 /*
2197  * predefined data for processing units
2198  */
2199 struct procunit_value_info {
2200         int control;
2201         char *suffix;
2202         int val_type;
2203         int min_value;
2204 };
2205
2206 struct procunit_info {
2207         int type;
2208         char *name;
2209         struct procunit_value_info *values;
2210 };
2211
2212 static struct procunit_value_info undefined_proc_info[] = {
2213         { 0x00, "Control Undefined", 0 },
2214         { 0 }
2215 };
2216
2217 static struct procunit_value_info updown_proc_info[] = {
2218         { UAC_UD_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2219         { UAC_UD_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
2220         { 0 }
2221 };
2222 static struct procunit_value_info prologic_proc_info[] = {
2223         { UAC_DP_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2224         { UAC_DP_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
2225         { 0 }
2226 };
2227 static struct procunit_value_info threed_enh_proc_info[] = {
2228         { UAC_3D_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2229         { UAC_3D_SPACE, "Spaciousness", USB_MIXER_U8 },
2230         { 0 }
2231 };
2232 static struct procunit_value_info reverb_proc_info[] = {
2233         { UAC_REVERB_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2234         { UAC_REVERB_LEVEL, "Level", USB_MIXER_U8 },
2235         { UAC_REVERB_TIME, "Time", USB_MIXER_U16 },
2236         { UAC_REVERB_FEEDBACK, "Feedback", USB_MIXER_U8 },
2237         { 0 }
2238 };
2239 static struct procunit_value_info chorus_proc_info[] = {
2240         { UAC_CHORUS_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2241         { UAC_CHORUS_LEVEL, "Level", USB_MIXER_U8 },
2242         { UAC_CHORUS_RATE, "Rate", USB_MIXER_U16 },
2243         { UAC_CHORUS_DEPTH, "Depth", USB_MIXER_U16 },
2244         { 0 }
2245 };
2246 static struct procunit_value_info dcr_proc_info[] = {
2247         { UAC_DCR_ENABLE, "Switch", USB_MIXER_BOOLEAN },
2248         { UAC_DCR_RATE, "Ratio", USB_MIXER_U16 },
2249         { UAC_DCR_MAXAMPL, "Max Amp", USB_MIXER_S16 },
2250         { UAC_DCR_THRESHOLD, "Threshold", USB_MIXER_S16 },
2251         { UAC_DCR_ATTACK_TIME, "Attack Time", USB_MIXER_U16 },
2252         { UAC_DCR_RELEASE_TIME, "Release Time", USB_MIXER_U16 },
2253         { 0 }
2254 };
2255
2256 static struct procunit_info procunits[] = {
2257         { UAC_PROCESS_UP_DOWNMIX, "Up Down", updown_proc_info },
2258         { UAC_PROCESS_DOLBY_PROLOGIC, "Dolby Prologic", prologic_proc_info },
2259         { UAC_PROCESS_STEREO_EXTENDER, "3D Stereo Extender", threed_enh_proc_info },
2260         { UAC_PROCESS_REVERB, "Reverb", reverb_proc_info },
2261         { UAC_PROCESS_CHORUS, "Chorus", chorus_proc_info },
2262         { UAC_PROCESS_DYN_RANGE_COMP, "DCR", dcr_proc_info },
2263         { 0 },
2264 };
2265
2266 static struct procunit_value_info uac3_updown_proc_info[] = {
2267         { UAC3_UD_MODE_SELECT, "Mode Select", USB_MIXER_U8, 1 },
2268         { 0 }
2269 };
2270 static struct procunit_value_info uac3_stereo_ext_proc_info[] = {
2271         { UAC3_EXT_WIDTH_CONTROL, "Width Control", USB_MIXER_U8 },
2272         { 0 }
2273 };
2274
2275 static struct procunit_info uac3_procunits[] = {
2276         { UAC3_PROCESS_UP_DOWNMIX, "Up Down", uac3_updown_proc_info },
2277         { UAC3_PROCESS_STEREO_EXTENDER, "3D Stereo Extender", uac3_stereo_ext_proc_info },
2278         { UAC3_PROCESS_MULTI_FUNCTION, "Multi-Function", undefined_proc_info },
2279         { 0 },
2280 };
2281
2282 /*
2283  * predefined data for extension units
2284  */
2285 static struct procunit_value_info clock_rate_xu_info[] = {
2286         { USB_XU_CLOCK_RATE_SELECTOR, "Selector", USB_MIXER_U8, 0 },
2287         { 0 }
2288 };
2289 static struct procunit_value_info clock_source_xu_info[] = {
2290         { USB_XU_CLOCK_SOURCE_SELECTOR, "External", USB_MIXER_BOOLEAN },
2291         { 0 }
2292 };
2293 static struct procunit_value_info spdif_format_xu_info[] = {
2294         { USB_XU_DIGITAL_FORMAT_SELECTOR, "SPDIF/AC3", USB_MIXER_BOOLEAN },
2295         { 0 }
2296 };
2297 static struct procunit_value_info soft_limit_xu_info[] = {
2298         { USB_XU_SOFT_LIMIT_SELECTOR, " ", USB_MIXER_BOOLEAN },
2299         { 0 }
2300 };
2301 static struct procunit_info extunits[] = {
2302         { USB_XU_CLOCK_RATE, "Clock rate", clock_rate_xu_info },
2303         { USB_XU_CLOCK_SOURCE, "DigitalIn CLK source", clock_source_xu_info },
2304         { USB_XU_DIGITAL_IO_STATUS, "DigitalOut format:", spdif_format_xu_info },
2305         { USB_XU_DEVICE_OPTIONS, "AnalogueIn Soft Limit", soft_limit_xu_info },
2306         { 0 }
2307 };
2308
2309 /*
2310  * build a processing/extension unit
2311  */
2312 static int build_audio_procunit(struct mixer_build *state, int unitid,
2313                                 void *raw_desc, struct procunit_info *list,
2314                                 bool extension_unit)
2315 {
2316         struct uac_processing_unit_descriptor *desc = raw_desc;
2317         int num_ins;
2318         struct usb_mixer_elem_info *cval;
2319         struct snd_kcontrol *kctl;
2320         int i, err, nameid, type, len;
2321         struct procunit_info *info;
2322         struct procunit_value_info *valinfo;
2323         const struct usbmix_name_map *map;
2324         static struct procunit_value_info default_value_info[] = {
2325                 { 0x01, "Switch", USB_MIXER_BOOLEAN },
2326                 { 0 }
2327         };
2328         static struct procunit_info default_info = {
2329                 0, NULL, default_value_info
2330         };
2331         const char *name = extension_unit ?
2332                 "Extension Unit" : "Processing Unit";
2333
2334         num_ins = desc->bNrInPins;
2335         for (i = 0; i < num_ins; i++) {
2336                 err = parse_audio_unit(state, desc->baSourceID[i]);
2337                 if (err < 0)
2338                         return err;
2339         }
2340
2341         type = le16_to_cpu(desc->wProcessType);
2342         for (info = list; info && info->type; info++)
2343                 if (info->type == type)
2344                         break;
2345         if (!info || !info->type)
2346                 info = &default_info;
2347
2348         for (valinfo = info->values; valinfo->control; valinfo++) {
2349                 __u8 *controls = uac_processing_unit_bmControls(desc, state->mixer->protocol);
2350
2351                 if (state->mixer->protocol == UAC_VERSION_1) {
2352                         if (!(controls[valinfo->control / 8] &
2353                                         (1 << ((valinfo->control % 8) - 1))))
2354                                 continue;
2355                 } else { /* UAC_VERSION_2/3 */
2356                         if (!uac_v2v3_control_is_readable(controls[valinfo->control / 8],
2357                                                           valinfo->control))
2358                                 continue;
2359                 }
2360
2361                 map = find_map(state->map, unitid, valinfo->control);
2362                 if (check_ignored_ctl(map))
2363                         continue;
2364                 cval = kzalloc(sizeof(*cval), GFP_KERNEL);
2365                 if (!cval)
2366                         return -ENOMEM;
2367                 snd_usb_mixer_elem_init_std(&cval->head, state->mixer, unitid);
2368                 cval->control = valinfo->control;
2369                 cval->val_type = valinfo->val_type;
2370                 cval->channels = 1;
2371
2372                 if (state->mixer->protocol > UAC_VERSION_1 &&
2373                     !uac_v2v3_control_is_writeable(controls[valinfo->control / 8],
2374                                                    valinfo->control))
2375                         cval->master_readonly = 1;
2376
2377                 /* get min/max values */
2378                 switch (type) {
2379                 case UAC_PROCESS_UP_DOWNMIX: {
2380                         bool mode_sel = false;
2381
2382                         switch (state->mixer->protocol) {
2383                         case UAC_VERSION_1:
2384                         case UAC_VERSION_2:
2385                         default:
2386                                 if (cval->control == UAC_UD_MODE_SELECT)
2387                                         mode_sel = true;
2388                                 break;
2389                         case UAC_VERSION_3:
2390                                 if (cval->control == UAC3_UD_MODE_SELECT)
2391                                         mode_sel = true;
2392                                 break;
2393                         }
2394
2395                         if (mode_sel) {
2396                                 __u8 *control_spec = uac_processing_unit_specific(desc,
2397                                                                 state->mixer->protocol);
2398                                 cval->min = 1;
2399                                 cval->max = control_spec[0];
2400                                 cval->res = 1;
2401                                 cval->initialized = 1;
2402                                 break;
2403                         }
2404
2405                         get_min_max(cval, valinfo->min_value);
2406                         break;
2407                 }
2408                 case USB_XU_CLOCK_RATE:
2409                         /*
2410                          * E-Mu USB 0404/0202/TrackerPre/0204
2411                          * samplerate control quirk
2412                          */
2413                         cval->min = 0;
2414                         cval->max = 5;
2415                         cval->res = 1;
2416                         cval->initialized = 1;
2417                         break;
2418                 default:
2419                         get_min_max(cval, valinfo->min_value);
2420                         break;
2421                 }
2422
2423                 kctl = snd_ctl_new1(&mixer_procunit_ctl, cval);
2424                 if (!kctl) {
2425                         usb_mixer_elem_info_free(cval);
2426                         return -ENOMEM;
2427                 }
2428                 kctl->private_free = snd_usb_mixer_elem_free;
2429
2430                 if (check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name))) {
2431                         /* nothing */ ;
2432                 } else if (info->name) {
2433                         strlcpy(kctl->id.name, info->name, sizeof(kctl->id.name));
2434                 } else {
2435                         if (extension_unit)
2436                                 nameid = uac_extension_unit_iExtension(desc, state->mixer->protocol);
2437                         else
2438                                 nameid = uac_processing_unit_iProcessing(desc, state->mixer->protocol);
2439                         len = 0;
2440                         if (nameid)
2441                                 len = snd_usb_copy_string_desc(state->chip,
2442                                                                nameid,
2443                                                                kctl->id.name,
2444                                                                sizeof(kctl->id.name));
2445                         if (!len)
2446                                 strlcpy(kctl->id.name, name, sizeof(kctl->id.name));
2447                 }
2448                 append_ctl_name(kctl, " ");
2449                 append_ctl_name(kctl, valinfo->suffix);
2450
2451                 usb_audio_dbg(state->chip,
2452                               "[%d] PU [%s] ch = %d, val = %d/%d\n",
2453                               cval->head.id, kctl->id.name, cval->channels,
2454                               cval->min, cval->max);
2455
2456                 err = snd_usb_mixer_add_control(&cval->head, kctl);
2457                 if (err < 0)
2458                         return err;
2459         }
2460         return 0;
2461 }
2462
2463 static int parse_audio_processing_unit(struct mixer_build *state, int unitid,
2464                                        void *raw_desc)
2465 {
2466         switch (state->mixer->protocol) {
2467         case UAC_VERSION_1:
2468         case UAC_VERSION_2:
2469         default:
2470                 return build_audio_procunit(state, unitid, raw_desc,
2471                                             procunits, false);
2472         case UAC_VERSION_3:
2473                 return build_audio_procunit(state, unitid, raw_desc,
2474                                             uac3_procunits, false);
2475         }
2476 }
2477
2478 static int parse_audio_extension_unit(struct mixer_build *state, int unitid,
2479                                       void *raw_desc)
2480 {
2481         /*
2482          * Note that we parse extension units with processing unit descriptors.
2483          * That's ok as the layout is the same.
2484          */
2485         return build_audio_procunit(state, unitid, raw_desc, extunits, true);
2486 }
2487
2488 /*
2489  * Selector Unit
2490  */
2491
2492 /*
2493  * info callback for selector unit
2494  * use an enumerator type for routing
2495  */
2496 static int mixer_ctl_selector_info(struct snd_kcontrol *kcontrol,
2497                                    struct snd_ctl_elem_info *uinfo)
2498 {
2499         struct usb_mixer_elem_info *cval = kcontrol->private_data;
2500         const char **itemlist = (const char **)kcontrol->private_value;
2501
2502         if (snd_BUG_ON(!itemlist))
2503                 return -EINVAL;
2504         return snd_ctl_enum_info(uinfo, 1, cval->max, itemlist);
2505 }
2506
2507 /* get callback for selector unit */
2508 static int mixer_ctl_selector_get(struct snd_kcontrol *kcontrol,
2509                                   struct snd_ctl_elem_value *ucontrol)
2510 {
2511         struct usb_mixer_elem_info *cval = kcontrol->private_data;
2512         int val, err;
2513
2514         err = get_cur_ctl_value(cval, cval->control << 8, &val);
2515         if (err < 0) {
2516                 ucontrol->value.enumerated.item[0] = 0;
2517                 return filter_error(cval, err);
2518         }
2519         val = get_relative_value(cval, val);
2520         ucontrol->value.enumerated.item[0] = val;
2521         return 0;
2522 }
2523
2524 /* put callback for selector unit */
2525 static int mixer_ctl_selector_put(struct snd_kcontrol *kcontrol,
2526                                   struct snd_ctl_elem_value *ucontrol)
2527 {
2528         struct usb_mixer_elem_info *cval = kcontrol->private_data;
2529         int val, oval, err;
2530
2531         err = get_cur_ctl_value(cval, cval->control << 8, &oval);
2532         if (err < 0)
2533                 return filter_error(cval, err);
2534         val = ucontrol->value.enumerated.item[0];
2535         val = get_abs_value(cval, val);
2536         if (val != oval) {
2537                 set_cur_ctl_value(cval, cval->control << 8, val);
2538                 return 1;
2539         }
2540         return 0;
2541 }
2542
2543 /* alsa control interface for selector unit */
2544 static const struct snd_kcontrol_new mixer_selectunit_ctl = {
2545         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
2546         .name = "", /* will be filled later */
2547         .info = mixer_ctl_selector_info,
2548         .get = mixer_ctl_selector_get,
2549         .put = mixer_ctl_selector_put,
2550 };
2551
2552 /*
2553  * private free callback.
2554  * free both private_data and private_value
2555  */
2556 static void usb_mixer_selector_elem_free(struct snd_kcontrol *kctl)
2557 {
2558         int i, num_ins = 0;
2559
2560         if (kctl->private_data) {
2561                 struct usb_mixer_elem_info *cval = kctl->private_data;
2562                 num_ins = cval->max;
2563                 usb_mixer_elem_info_free(cval);
2564                 kctl->private_data = NULL;
2565         }
2566         if (kctl->private_value) {
2567                 char **itemlist = (char **)kctl->private_value;
2568                 for (i = 0; i < num_ins; i++)
2569                         kfree(itemlist[i]);
2570                 kfree(itemlist);
2571                 kctl->private_value = 0;
2572         }
2573 }
2574
2575 /*
2576  * parse a selector unit
2577  */
2578 static int parse_audio_selector_unit(struct mixer_build *state, int unitid,
2579                                      void *raw_desc)
2580 {
2581         struct uac_selector_unit_descriptor *desc = raw_desc;
2582         unsigned int i, nameid, len;
2583         int err;
2584         struct usb_mixer_elem_info *cval;
2585         struct snd_kcontrol *kctl;
2586         const struct usbmix_name_map *map;
2587         char **namelist;
2588
2589         for (i = 0; i < desc->bNrInPins; i++) {
2590                 err = parse_audio_unit(state, desc->baSourceID[i]);
2591                 if (err < 0)
2592                         return err;
2593         }
2594
2595         if (desc->bNrInPins == 1) /* only one ? nonsense! */
2596                 return 0;
2597
2598         map = find_map(state->map, unitid, 0);
2599         if (check_ignored_ctl(map))
2600                 return 0;
2601
2602         cval = kzalloc(sizeof(*cval), GFP_KERNEL);
2603         if (!cval)
2604                 return -ENOMEM;
2605         snd_usb_mixer_elem_init_std(&cval->head, state->mixer, unitid);
2606         cval->val_type = USB_MIXER_U8;
2607         cval->channels = 1;
2608         cval->min = 1;
2609         cval->max = desc->bNrInPins;
2610         cval->res = 1;
2611         cval->initialized = 1;
2612
2613         switch (state->mixer->protocol) {
2614         case UAC_VERSION_1:
2615         default:
2616                 cval->control = 0;
2617                 break;
2618         case UAC_VERSION_2:
2619         case UAC_VERSION_3:
2620                 if (desc->bDescriptorSubtype == UAC2_CLOCK_SELECTOR ||
2621                     desc->bDescriptorSubtype == UAC3_CLOCK_SELECTOR)
2622                         cval->control = UAC2_CX_CLOCK_SELECTOR;
2623                 else /* UAC2/3_SELECTOR_UNIT */
2624                         cval->control = UAC2_SU_SELECTOR;
2625                 break;
2626         }
2627
2628         namelist = kcalloc(desc->bNrInPins, sizeof(char *), GFP_KERNEL);
2629         if (!namelist) {
2630                 err = -ENOMEM;
2631                 goto error_cval;
2632         }
2633 #define MAX_ITEM_NAME_LEN       64
2634         for (i = 0; i < desc->bNrInPins; i++) {
2635                 struct usb_audio_term iterm;
2636                 len = 0;
2637                 namelist[i] = kmalloc(MAX_ITEM_NAME_LEN, GFP_KERNEL);
2638                 if (!namelist[i]) {
2639                         err = -ENOMEM;
2640                         goto error_name;
2641                 }
2642                 len = check_mapped_selector_name(state, unitid, i, namelist[i],
2643                                                  MAX_ITEM_NAME_LEN);
2644                 if (! len && check_input_term(state, desc->baSourceID[i], &iterm) >= 0)
2645                         len = get_term_name(state->chip, &iterm, namelist[i],
2646                                             MAX_ITEM_NAME_LEN, 0);
2647                 if (! len)
2648                         sprintf(namelist[i], "Input %u", i);
2649         }
2650
2651         kctl = snd_ctl_new1(&mixer_selectunit_ctl, cval);
2652         if (! kctl) {
2653                 usb_audio_err(state->chip, "cannot malloc kcontrol\n");
2654                 err = -ENOMEM;
2655                 goto error_name;
2656         }
2657         kctl->private_value = (unsigned long)namelist;
2658         kctl->private_free = usb_mixer_selector_elem_free;
2659
2660         /* check the static mapping table at first */
2661         len = check_mapped_name(map, kctl->id.name, sizeof(kctl->id.name));
2662         if (!len) {
2663                 /* no mapping ? */
2664                 switch (state->mixer->protocol) {
2665                 case UAC_VERSION_1:
2666                 case UAC_VERSION_2:
2667                 default:
2668                 /* if iSelector is given, use it */
2669                         nameid = uac_selector_unit_iSelector(desc);
2670                         if (nameid)
2671                                 len = snd_usb_copy_string_desc(state->chip,
2672                                                         nameid, kctl->id.name,
2673                                                         sizeof(kctl->id.name));
2674                         break;
2675                 case UAC_VERSION_3:
2676                         /* TODO: Class-Specific strings not yet supported */
2677                         break;
2678                 }
2679
2680                 /* ... or pick up the terminal name at next */
2681                 if (!len)
2682                         len = get_term_name(state->chip, &state->oterm,
2683                                     kctl->id.name, sizeof(kctl->id.name), 0);
2684                 /* ... or use the fixed string "USB" as the last resort */
2685                 if (!len)
2686                         strlcpy(kctl->id.name, "USB", sizeof(kctl->id.name));
2687
2688                 /* and add the proper suffix */
2689                 if (desc->bDescriptorSubtype == UAC2_CLOCK_SELECTOR ||
2690                     desc->bDescriptorSubtype == UAC3_CLOCK_SELECTOR)
2691                         append_ctl_name(kctl, " Clock Source");
2692                 else if ((state->oterm.type & 0xff00) == 0x0100)
2693                         append_ctl_name(kctl, " Capture Source");
2694                 else
2695                         append_ctl_name(kctl, " Playback Source");
2696         }
2697
2698         usb_audio_dbg(state->chip, "[%d] SU [%s] items = %d\n",
2699                     cval->head.id, kctl->id.name, desc->bNrInPins);
2700         return snd_usb_mixer_add_control(&cval->head, kctl);
2701
2702  error_name:
2703         for (i = 0; i < desc->bNrInPins; i++)
2704                 kfree(namelist[i]);
2705         kfree(namelist);
2706  error_cval:
2707         usb_mixer_elem_info_free(cval);
2708         return err;
2709 }
2710
2711 /*
2712  * parse an audio unit recursively
2713  */
2714
2715 static int parse_audio_unit(struct mixer_build *state, int unitid)
2716 {
2717         unsigned char *p1;
2718         int protocol = state->mixer->protocol;
2719
2720         if (test_and_set_bit(unitid, state->unitbitmap))
2721                 return 0; /* the unit already visited */
2722
2723         p1 = find_audio_control_unit(state, unitid);
2724         if (!p1) {
2725                 usb_audio_err(state->chip, "unit %d not found!\n", unitid);
2726                 return -EINVAL;
2727         }
2728
2729         if (!snd_usb_validate_audio_desc(p1, protocol)) {
2730                 usb_audio_dbg(state->chip, "invalid unit %d\n", unitid);
2731                 return 0; /* skip invalid unit */
2732         }
2733
2734         switch (PTYPE(protocol, p1[2])) {
2735         case PTYPE(UAC_VERSION_1, UAC_INPUT_TERMINAL):
2736         case PTYPE(UAC_VERSION_2, UAC_INPUT_TERMINAL):
2737         case PTYPE(UAC_VERSION_3, UAC_INPUT_TERMINAL):
2738                 return parse_audio_input_terminal(state, unitid, p1);
2739         case PTYPE(UAC_VERSION_1, UAC_MIXER_UNIT):
2740         case PTYPE(UAC_VERSION_2, UAC_MIXER_UNIT):
2741         case PTYPE(UAC_VERSION_3, UAC3_MIXER_UNIT):
2742                 return parse_audio_mixer_unit(state, unitid, p1);
2743         case PTYPE(UAC_VERSION_2, UAC2_CLOCK_SOURCE):
2744         case PTYPE(UAC_VERSION_3, UAC3_CLOCK_SOURCE):
2745                 return parse_clock_source_unit(state, unitid, p1);
2746         case PTYPE(UAC_VERSION_1, UAC_SELECTOR_UNIT):
2747         case PTYPE(UAC_VERSION_2, UAC_SELECTOR_UNIT):
2748         case PTYPE(UAC_VERSION_3, UAC3_SELECTOR_UNIT):
2749         case PTYPE(UAC_VERSION_2, UAC2_CLOCK_SELECTOR):
2750         case PTYPE(UAC_VERSION_3, UAC3_CLOCK_SELECTOR):
2751                 return parse_audio_selector_unit(state, unitid, p1);
2752         case PTYPE(UAC_VERSION_1, UAC_FEATURE_UNIT):
2753         case PTYPE(UAC_VERSION_2, UAC_FEATURE_UNIT):
2754         case PTYPE(UAC_VERSION_3, UAC3_FEATURE_UNIT):
2755                 return parse_audio_feature_unit(state, unitid, p1);
2756         case PTYPE(UAC_VERSION_1, UAC1_PROCESSING_UNIT):
2757         case PTYPE(UAC_VERSION_2, UAC2_PROCESSING_UNIT_V2):
2758         case PTYPE(UAC_VERSION_3, UAC3_PROCESSING_UNIT):
2759                 return parse_audio_processing_unit(state, unitid, p1);
2760         case PTYPE(UAC_VERSION_1, UAC1_EXTENSION_UNIT):
2761         case PTYPE(UAC_VERSION_2, UAC2_EXTENSION_UNIT_V2):
2762         case PTYPE(UAC_VERSION_3, UAC3_EXTENSION_UNIT):
2763                 return parse_audio_extension_unit(state, unitid, p1);
2764         case PTYPE(UAC_VERSION_2, UAC2_EFFECT_UNIT):
2765         case PTYPE(UAC_VERSION_3, UAC3_EFFECT_UNIT):
2766                 return 0; /* FIXME - effect units not implemented yet */
2767         default:
2768                 usb_audio_err(state->chip,
2769                               "unit %u: unexpected type 0x%02x\n",
2770                               unitid, p1[2]);
2771                 return -EINVAL;
2772         }
2773 }
2774
2775 static void snd_usb_mixer_free(struct usb_mixer_interface *mixer)
2776 {
2777         /* kill pending URBs */
2778         snd_usb_mixer_disconnect(mixer);
2779
2780         kfree(mixer->id_elems);
2781         if (mixer->urb) {
2782                 kfree(mixer->urb->transfer_buffer);
2783                 usb_free_urb(mixer->urb);
2784         }
2785         usb_free_urb(mixer->rc_urb);
2786         kfree(mixer->rc_setup_packet);
2787         kfree(mixer);
2788 }
2789
2790 static int snd_usb_mixer_dev_free(struct snd_device *device)
2791 {
2792         struct usb_mixer_interface *mixer = device->device_data;
2793         snd_usb_mixer_free(mixer);
2794         return 0;
2795 }
2796
2797 /* UAC3 predefined channels configuration */
2798 struct uac3_badd_profile {
2799         int subclass;
2800         const char *name;
2801         int c_chmask;   /* capture channels mask */
2802         int p_chmask;   /* playback channels mask */
2803         int st_chmask;  /* side tone mixing channel mask */
2804 };
2805
2806 static struct uac3_badd_profile uac3_badd_profiles[] = {
2807         {
2808                 /*
2809                  * BAIF, BAOF or combination of both
2810                  * IN: Mono or Stereo cfg, Mono alt possible
2811                  * OUT: Mono or Stereo cfg, Mono alt possible
2812                  */
2813                 .subclass = UAC3_FUNCTION_SUBCLASS_GENERIC_IO,
2814                 .name = "GENERIC IO",
2815                 .c_chmask = -1,         /* dynamic channels */
2816                 .p_chmask = -1,         /* dynamic channels */
2817         },
2818         {
2819                 /* BAOF; Stereo only cfg, Mono alt possible */
2820                 .subclass = UAC3_FUNCTION_SUBCLASS_HEADPHONE,
2821                 .name = "HEADPHONE",
2822                 .p_chmask = 3,
2823         },
2824         {
2825                 /* BAOF; Mono or Stereo cfg, Mono alt possible */
2826                 .subclass = UAC3_FUNCTION_SUBCLASS_SPEAKER,
2827                 .name = "SPEAKER",
2828                 .p_chmask = -1,         /* dynamic channels */
2829         },
2830         {
2831                 /* BAIF; Mono or Stereo cfg, Mono alt possible */
2832                 .subclass = UAC3_FUNCTION_SUBCLASS_MICROPHONE,
2833                 .name = "MICROPHONE",
2834                 .c_chmask = -1,         /* dynamic channels */
2835         },
2836         {
2837                 /*
2838                  * BAIOF topology
2839                  * IN: Mono only
2840                  * OUT: Mono or Stereo cfg, Mono alt possible
2841                  */
2842                 .subclass = UAC3_FUNCTION_SUBCLASS_HEADSET,
2843                 .name = "HEADSET",
2844                 .c_chmask = 1,
2845                 .p_chmask = -1,         /* dynamic channels */
2846                 .st_chmask = 1,
2847         },
2848         {
2849                 /* BAIOF; IN: Mono only; OUT: Stereo only, Mono alt possible */
2850                 .subclass = UAC3_FUNCTION_SUBCLASS_HEADSET_ADAPTER,
2851                 .name = "HEADSET ADAPTER",
2852                 .c_chmask = 1,
2853                 .p_chmask = 3,
2854                 .st_chmask = 1,
2855         },
2856         {
2857                 /* BAIF + BAOF; IN: Mono only; OUT: Mono only */
2858                 .subclass = UAC3_FUNCTION_SUBCLASS_SPEAKERPHONE,
2859                 .name = "SPEAKERPHONE",
2860                 .c_chmask = 1,
2861                 .p_chmask = 1,
2862         },
2863         { 0 } /* terminator */
2864 };
2865
2866 static bool uac3_badd_func_has_valid_channels(struct usb_mixer_interface *mixer,
2867                                               struct uac3_badd_profile *f,
2868                                               int c_chmask, int p_chmask)
2869 {
2870         /*
2871          * If both playback/capture channels are dynamic, make sure
2872          * at least one channel is present
2873          */
2874         if (f->c_chmask < 0 && f->p_chmask < 0) {
2875                 if (!c_chmask && !p_chmask) {
2876                         usb_audio_warn(mixer->chip, "BAAD %s: no channels?",
2877                                        f->name);
2878                         return false;
2879                 }
2880                 return true;
2881         }
2882
2883         if ((f->c_chmask < 0 && !c_chmask) ||
2884             (f->c_chmask >= 0 && f->c_chmask != c_chmask)) {
2885                 usb_audio_warn(mixer->chip, "BAAD %s c_chmask mismatch",
2886                                f->name);
2887                 return false;
2888         }
2889         if ((f->p_chmask < 0 && !p_chmask) ||
2890             (f->p_chmask >= 0 && f->p_chmask != p_chmask)) {
2891                 usb_audio_warn(mixer->chip, "BAAD %s p_chmask mismatch",
2892                                f->name);
2893                 return false;
2894         }
2895         return true;
2896 }
2897
2898 /*
2899  * create mixer controls for UAC3 BADD profiles
2900  *
2901  * UAC3 BADD device doesn't contain CS descriptors thus we will guess everything
2902  *
2903  * BADD device may contain Mixer Unit, which doesn't have any controls, skip it
2904  */
2905 static int snd_usb_mixer_controls_badd(struct usb_mixer_interface *mixer,
2906                                        int ctrlif)
2907 {
2908         struct usb_device *dev = mixer->chip->dev;
2909         struct usb_interface_assoc_descriptor *assoc;
2910         int badd_profile = mixer->chip->badd_profile;
2911         struct uac3_badd_profile *f;
2912         const struct usbmix_ctl_map *map;
2913         int p_chmask = 0, c_chmask = 0, st_chmask = 0;
2914         int i;
2915
2916         assoc = usb_ifnum_to_if(dev, ctrlif)->intf_assoc;
2917
2918         /* Detect BADD capture/playback channels from AS EP descriptors */
2919         for (i = 0; i < assoc->bInterfaceCount; i++) {
2920                 int intf = assoc->bFirstInterface + i;
2921
2922                 struct usb_interface *iface;
2923                 struct usb_host_interface *alts;
2924                 struct usb_interface_descriptor *altsd;
2925                 unsigned int maxpacksize;
2926                 char dir_in;
2927                 int chmask, num;
2928
2929                 if (intf == ctrlif)
2930                         continue;
2931
2932                 iface = usb_ifnum_to_if(dev, intf);
2933                 if (!iface)
2934                         continue;
2935
2936                 num = iface->num_altsetting;
2937
2938                 if (num < 2)
2939                         return -EINVAL;
2940
2941                 /*
2942                  * The number of Channels in an AudioStreaming interface
2943                  * and the audio sample bit resolution (16 bits or 24
2944                  * bits) can be derived from the wMaxPacketSize field in
2945                  * the Standard AS Audio Data Endpoint descriptor in
2946                  * Alternate Setting 1
2947                  */
2948                 alts = &iface->altsetting[1];
2949                 altsd = get_iface_desc(alts);
2950
2951                 if (altsd->bNumEndpoints < 1)
2952                         return -EINVAL;
2953
2954                 /* check direction */
2955                 dir_in = (get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN);
2956                 maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
2957
2958                 switch (maxpacksize) {
2959                 default:
2960                         usb_audio_err(mixer->chip,
2961                                 "incorrect wMaxPacketSize 0x%x for BADD profile\n",
2962                                 maxpacksize);
2963                         return -EINVAL;
2964                 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_16:
2965                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_16:
2966                 case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_24:
2967                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_24:
2968                         chmask = 1;
2969                         break;
2970                 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_16:
2971                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_16:
2972                 case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_24:
2973                 case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_24:
2974                         chmask = 3;
2975                         break;
2976                 }
2977
2978                 if (dir_in)
2979                         c_chmask = chmask;
2980                 else
2981                         p_chmask = chmask;
2982         }
2983
2984         usb_audio_dbg(mixer->chip,
2985                 "UAC3 BADD profile 0x%x: detected c_chmask=%d p_chmask=%d\n",
2986                 badd_profile, c_chmask, p_chmask);
2987
2988         /* check the mapping table */
2989         for (map = uac3_badd_usbmix_ctl_maps; map->id; map++) {
2990                 if (map->id == badd_profile)
2991                         break;
2992         }
2993
2994         if (!map->id)
2995                 return -EINVAL;
2996
2997         for (f = uac3_badd_profiles; f->name; f++) {
2998                 if (badd_profile == f->subclass)
2999                         break;
3000         }
3001         if (!f->name)
3002                 return -EINVAL;
3003         if (!uac3_badd_func_has_valid_channels(mixer, f, c_chmask, p_chmask))
3004                 return -EINVAL;
3005         st_chmask = f->st_chmask;
3006
3007         /* Playback */
3008         if (p_chmask) {
3009                 /* Master channel, always writable */
3010                 build_feature_ctl_badd(mixer, 0, UAC_FU_MUTE,
3011                                        UAC3_BADD_FU_ID2, map->map);
3012                 /* Mono/Stereo volume channels, always writable */
3013                 build_feature_ctl_badd(mixer, p_chmask, UAC_FU_VOLUME,
3014                                        UAC3_BADD_FU_ID2, map->map);
3015         }
3016
3017         /* Capture */
3018         if (c_chmask) {
3019                 /* Master channel, always writable */
3020                 build_feature_ctl_badd(mixer, 0, UAC_FU_MUTE,
3021                                        UAC3_BADD_FU_ID5, map->map);
3022                 /* Mono/Stereo volume channels, always writable */
3023                 build_feature_ctl_badd(mixer, c_chmask, UAC_FU_VOLUME,
3024                                        UAC3_BADD_FU_ID5, map->map);
3025         }
3026
3027         /* Side tone-mixing */
3028         if (st_chmask) {
3029                 /* Master channel, always writable */
3030                 build_feature_ctl_badd(mixer, 0, UAC_FU_MUTE,
3031                                        UAC3_BADD_FU_ID7, map->map);
3032                 /* Mono volume channel, always writable */
3033                 build_feature_ctl_badd(mixer, 1, UAC_FU_VOLUME,
3034                                        UAC3_BADD_FU_ID7, map->map);
3035         }
3036
3037         /* Insertion Control */
3038         if (f->subclass == UAC3_FUNCTION_SUBCLASS_HEADSET_ADAPTER) {
3039                 struct usb_audio_term iterm, oterm;
3040
3041                 /* Input Term - Insertion control */
3042                 memset(&iterm, 0, sizeof(iterm));
3043                 iterm.id = UAC3_BADD_IT_ID4;
3044                 iterm.type = UAC_BIDIR_TERMINAL_HEADSET;
3045                 build_connector_control(mixer, &iterm, true);
3046
3047                 /* Output Term - Insertion control */
3048                 memset(&oterm, 0, sizeof(oterm));
3049                 oterm.id = UAC3_BADD_OT_ID3;
3050                 oterm.type = UAC_BIDIR_TERMINAL_HEADSET;
3051                 build_connector_control(mixer, &oterm, false);
3052         }
3053
3054         return 0;
3055 }
3056
3057 /*
3058  * create mixer controls
3059  *
3060  * walk through all UAC_OUTPUT_TERMINAL descriptors to search for mixers
3061  */
3062 static int snd_usb_mixer_controls(struct usb_mixer_interface *mixer)
3063 {
3064         struct mixer_build state;
3065         int err;
3066         const struct usbmix_ctl_map *map;
3067         void *p;
3068
3069         memset(&state, 0, sizeof(state));
3070         state.chip = mixer->chip;
3071         state.mixer = mixer;
3072         state.buffer = mixer->hostif->extra;
3073         state.buflen = mixer->hostif->extralen;
3074
3075         /* check the mapping table */
3076         for (map = usbmix_ctl_maps; map->id; map++) {
3077                 if (map->id == state.chip->usb_id) {
3078                         state.map = map->map;
3079                         state.selector_map = map->selector_map;
3080                         mixer->ignore_ctl_error = map->ignore_ctl_error;
3081                         break;
3082                 }
3083         }
3084
3085         p = NULL;
3086         while ((p = snd_usb_find_csint_desc(mixer->hostif->extra,
3087                                             mixer->hostif->extralen,
3088                                             p, UAC_OUTPUT_TERMINAL)) != NULL) {
3089                 if (!snd_usb_validate_audio_desc(p, mixer->protocol))
3090                         continue; /* skip invalid descriptor */
3091
3092                 if (mixer->protocol == UAC_VERSION_1) {
3093                         struct uac1_output_terminal_descriptor *desc = p;
3094
3095                         /* mark terminal ID as visited */
3096                         set_bit(desc->bTerminalID, state.unitbitmap);
3097                         state.oterm.id = desc->bTerminalID;
3098                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
3099                         state.oterm.name = desc->iTerminal;
3100                         err = parse_audio_unit(&state, desc->bSourceID);
3101                         if (err < 0 && err != -EINVAL)
3102                                 return err;
3103                 } else if (mixer->protocol == UAC_VERSION_2) {
3104                         struct uac2_output_terminal_descriptor *desc = p;
3105
3106                         /* mark terminal ID as visited */
3107                         set_bit(desc->bTerminalID, state.unitbitmap);
3108                         state.oterm.id = desc->bTerminalID;
3109                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
3110                         state.oterm.name = desc->iTerminal;
3111                         err = parse_audio_unit(&state, desc->bSourceID);
3112                         if (err < 0 && err != -EINVAL)
3113                                 return err;
3114
3115                         /*
3116                          * For UAC2, use the same approach to also add the
3117                          * clock selectors
3118                          */
3119                         err = parse_audio_unit(&state, desc->bCSourceID);
3120                         if (err < 0 && err != -EINVAL)
3121                                 return err;
3122
3123                         if (uac_v2v3_control_is_readable(le16_to_cpu(desc->bmControls),
3124                                                          UAC2_TE_CONNECTOR)) {
3125                                 build_connector_control(state.mixer, &state.oterm,
3126                                                         false);
3127                         }
3128                 } else {  /* UAC_VERSION_3 */
3129                         struct uac3_output_terminal_descriptor *desc = p;
3130
3131                         /* mark terminal ID as visited */
3132                         set_bit(desc->bTerminalID, state.unitbitmap);
3133                         state.oterm.id = desc->bTerminalID;
3134                         state.oterm.type = le16_to_cpu(desc->wTerminalType);
3135                         state.oterm.name = le16_to_cpu(desc->wTerminalDescrStr);
3136                         err = parse_audio_unit(&state, desc->bSourceID);
3137                         if (err < 0 && err != -EINVAL)
3138                                 return err;
3139
3140                         /*
3141                          * For UAC3, use the same approach to also add the
3142                          * clock selectors
3143                          */
3144                         err = parse_audio_unit(&state, desc->bCSourceID);
3145                         if (err < 0 && err != -EINVAL)
3146                                 return err;
3147
3148                         if (uac_v2v3_control_is_readable(le32_to_cpu(desc->bmControls),
3149                                                          UAC3_TE_INSERTION)) {
3150                                 build_connector_control(state.mixer, &state.oterm,
3151                                                         false);
3152                         }
3153                 }
3154         }
3155
3156         return 0;
3157 }
3158
3159 void snd_usb_mixer_notify_id(struct usb_mixer_interface *mixer, int unitid)
3160 {
3161         struct usb_mixer_elem_list *list;
3162
3163         for_each_mixer_elem(list, mixer, unitid) {
3164                 struct usb_mixer_elem_info *info =
3165                         mixer_elem_list_to_info(list);
3166                 /* invalidate cache, so the value is read from the device */
3167                 info->cached = 0;
3168                 snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
3169                                &list->kctl->id);
3170         }
3171 }
3172
3173 static void snd_usb_mixer_dump_cval(struct snd_info_buffer *buffer,
3174                                     struct usb_mixer_elem_list *list)
3175 {
3176         struct usb_mixer_elem_info *cval = mixer_elem_list_to_info(list);
3177         static char *val_types[] = {"BOOLEAN", "INV_BOOLEAN",
3178                                     "S8", "U8", "S16", "U16"};
3179         snd_iprintf(buffer, "    Info: id=%i, control=%i, cmask=0x%x, "
3180                             "channels=%i, type=\"%s\"\n", cval->head.id,
3181                             cval->control, cval->cmask, cval->channels,
3182                             val_types[cval->val_type]);
3183         snd_iprintf(buffer, "    Volume: min=%i, max=%i, dBmin=%i, dBmax=%i\n",
3184                             cval->min, cval->max, cval->dBmin, cval->dBmax);
3185 }
3186
3187 static void snd_usb_mixer_proc_read(struct snd_info_entry *entry,
3188                                     struct snd_info_buffer *buffer)
3189 {
3190         struct snd_usb_audio *chip = entry->private_data;
3191         struct usb_mixer_interface *mixer;
3192         struct usb_mixer_elem_list *list;
3193         int unitid;
3194
3195         list_for_each_entry(mixer, &chip->mixer_list, list) {
3196                 snd_iprintf(buffer,
3197                         "USB Mixer: usb_id=0x%08x, ctrlif=%i, ctlerr=%i\n",
3198                                 chip->usb_id, snd_usb_ctrl_intf(chip),
3199                                 mixer->ignore_ctl_error);
3200                 snd_iprintf(buffer, "Card: %s\n", chip->card->longname);
3201                 for (unitid = 0; unitid < MAX_ID_ELEMS; unitid++) {
3202                         for_each_mixer_elem(list, mixer, unitid) {
3203                                 snd_iprintf(buffer, "  Unit: %i\n", list->id);
3204                                 if (list->kctl)
3205                                         snd_iprintf(buffer,
3206                                                     "    Control: name=\"%s\", index=%i\n",
3207                                                     list->kctl->id.name,
3208                                                     list->kctl->id.index);
3209                                 if (list->dump)
3210                                         list->dump(buffer, list);
3211                         }
3212                 }
3213         }
3214 }
3215
3216 static void snd_usb_mixer_interrupt_v2(struct usb_mixer_interface *mixer,
3217                                        int attribute, int value, int index)
3218 {
3219         struct usb_mixer_elem_list *list;
3220         __u8 unitid = (index >> 8) & 0xff;
3221         __u8 control = (value >> 8) & 0xff;
3222         __u8 channel = value & 0xff;
3223         unsigned int count = 0;
3224
3225         if (channel >= MAX_CHANNELS) {
3226                 usb_audio_dbg(mixer->chip,
3227                         "%s(): bogus channel number %d\n",
3228                         __func__, channel);
3229                 return;
3230         }
3231
3232         for_each_mixer_elem(list, mixer, unitid)
3233                 count++;
3234
3235         if (count == 0)
3236                 return;
3237
3238         for_each_mixer_elem(list, mixer, unitid) {
3239                 struct usb_mixer_elem_info *info;
3240
3241                 if (!list->kctl)
3242                         continue;
3243
3244                 info = mixer_elem_list_to_info(list);
3245                 if (count > 1 && info->control != control)
3246                         continue;
3247
3248                 switch (attribute) {
3249                 case UAC2_CS_CUR:
3250                         /* invalidate cache, so the value is read from the device */
3251                         if (channel)
3252                                 info->cached &= ~(1 << channel);
3253                         else /* master channel */
3254                                 info->cached = 0;
3255
3256                         snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
3257                                        &info->head.kctl->id);
3258                         break;
3259
3260                 case UAC2_CS_RANGE:
3261                         /* TODO */
3262                         break;
3263
3264                 case UAC2_CS_MEM:
3265                         /* TODO */
3266                         break;
3267
3268                 default:
3269                         usb_audio_dbg(mixer->chip,
3270                                 "unknown attribute %d in interrupt\n",
3271                                 attribute);
3272                         break;
3273                 } /* switch */
3274         }
3275 }
3276
3277 static void snd_usb_mixer_interrupt(struct urb *urb)
3278 {
3279         struct usb_mixer_interface *mixer = urb->context;
3280         int len = urb->actual_length;
3281         int ustatus = urb->status;
3282
3283         if (ustatus != 0)
3284                 goto requeue;
3285
3286         if (mixer->protocol == UAC_VERSION_1) {
3287                 struct uac1_status_word *status;
3288
3289                 for (status = urb->transfer_buffer;
3290                      len >= sizeof(*status);
3291                      len -= sizeof(*status), status++) {
3292                         dev_dbg(&urb->dev->dev, "status interrupt: %02x %02x\n",
3293                                                 status->bStatusType,
3294                                                 status->bOriginator);
3295
3296                         /* ignore any notifications not from the control interface */
3297                         if ((status->bStatusType & UAC1_STATUS_TYPE_ORIG_MASK) !=