[ALSA] usb-audio - remove superfluous LIRC ioctls
[safe/jmp/linux-2.6] / sound / usb / usbmixer.c
1 /*
2  *   (Tentative) USB Audio Driver for ALSA
3  *
4  *   Mixer control part
5  *
6  *   Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
7  *
8  *   Many codes borrowed from audio.c by
9  *          Alan Cox (alan@lxorguk.ukuu.org.uk)
10  *          Thomas Sailer (sailer@ife.ee.ethz.ch)
11  *
12  *
13  *   This program is free software; you can redistribute it and/or modify
14  *   it under the terms of the GNU General Public License as published by
15  *   the Free Software Foundation; either version 2 of the License, or
16  *   (at your option) any later version.
17  *
18  *   This program is distributed in the hope that it will be useful,
19  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
20  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
21  *   GNU General Public License for more details.
22  *
23  *   You should have received a copy of the GNU General Public License
24  *   along with this program; if not, write to the Free Software
25  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
26  *
27  */
28
29 #include <sound/driver.h>
30 #include <linux/bitops.h>
31 #include <linux/init.h>
32 #include <linux/list.h>
33 #include <linux/slab.h>
34 #include <linux/string.h>
35 #include <linux/usb.h>
36 #include <sound/core.h>
37 #include <sound/control.h>
38 #include <sound/hwdep.h>
39
40 #include "usbaudio.h"
41
42 /*
43  */
44
45 /* ignore error from controls - for debugging */
46 /* #define IGNORE_CTL_ERROR */
47
48 typedef struct usb_mixer_build mixer_build_t;
49 typedef struct usb_audio_term usb_audio_term_t;
50 typedef struct usb_mixer_elem_info usb_mixer_elem_info_t;
51
52
53 struct usb_mixer_interface {
54         snd_usb_audio_t *chip;
55         unsigned int ctrlif;
56         struct list_head list;
57         unsigned int ignore_ctl_error;
58         struct urb *urb;
59         usb_mixer_elem_info_t **id_elems; /* array[256], indexed by unit id */
60
61         /* Sound Blaster remote control stuff */
62         enum {
63                 RC_NONE,
64                 RC_EXTIGY,
65                 RC_AUDIGY2NX,
66         } rc_type;
67         unsigned long rc_hwdep_open;
68         u32 rc_code;
69         wait_queue_head_t rc_waitq;
70         struct urb *rc_urb;
71         struct usb_ctrlrequest *rc_setup_packet;
72         u8 rc_buffer[6];
73
74         u8 audigy2nx_leds[3];
75 };
76
77
78 struct usb_audio_term {
79         int id;
80         int type;
81         int channels;
82         unsigned int chconfig;
83         int name;
84 };
85
86 struct usbmix_name_map;
87
88 struct usb_mixer_build {
89         snd_usb_audio_t *chip;
90         struct usb_mixer_interface *mixer;
91         unsigned char *buffer;
92         unsigned int buflen;
93         DECLARE_BITMAP(unitbitmap, 256);
94         usb_audio_term_t oterm;
95         const struct usbmix_name_map *map;
96         const struct usbmix_selector_map *selector_map;
97 };
98
99 struct usb_mixer_elem_info {
100         struct usb_mixer_interface *mixer;
101         usb_mixer_elem_info_t *next_id_elem; /* list of controls with same id */
102         snd_ctl_elem_id_t *elem_id;
103         unsigned int id;
104         unsigned int control;   /* CS or ICN (high byte) */
105         unsigned int cmask; /* channel mask bitmap: 0 = master */
106         int channels;
107         int val_type;
108         int min, max, res;
109         u8 initialized;
110 };
111
112
113 enum {
114         USB_FEATURE_NONE = 0,
115         USB_FEATURE_MUTE = 1,
116         USB_FEATURE_VOLUME,
117         USB_FEATURE_BASS,
118         USB_FEATURE_MID,
119         USB_FEATURE_TREBLE,
120         USB_FEATURE_GEQ,
121         USB_FEATURE_AGC,
122         USB_FEATURE_DELAY,
123         USB_FEATURE_BASSBOOST,
124         USB_FEATURE_LOUDNESS
125 };
126
127 enum {
128         USB_MIXER_BOOLEAN,
129         USB_MIXER_INV_BOOLEAN,
130         USB_MIXER_S8,
131         USB_MIXER_U8,
132         USB_MIXER_S16,
133         USB_MIXER_U16,
134 };
135
136 enum {
137         USB_PROC_UPDOWN = 1,
138         USB_PROC_UPDOWN_SWITCH = 1,
139         USB_PROC_UPDOWN_MODE_SEL = 2,
140
141         USB_PROC_PROLOGIC = 2,
142         USB_PROC_PROLOGIC_SWITCH = 1,
143         USB_PROC_PROLOGIC_MODE_SEL = 2,
144
145         USB_PROC_3DENH = 3,
146         USB_PROC_3DENH_SWITCH = 1,
147         USB_PROC_3DENH_SPACE = 2,
148
149         USB_PROC_REVERB = 4,
150         USB_PROC_REVERB_SWITCH = 1,
151         USB_PROC_REVERB_LEVEL = 2,
152         USB_PROC_REVERB_TIME = 3,
153         USB_PROC_REVERB_DELAY = 4,
154
155         USB_PROC_CHORUS = 5,
156         USB_PROC_CHORUS_SWITCH = 1,
157         USB_PROC_CHORUS_LEVEL = 2,
158         USB_PROC_CHORUS_RATE = 3,
159         USB_PROC_CHORUS_DEPTH = 4,
160
161         USB_PROC_DCR = 6,
162         USB_PROC_DCR_SWITCH = 1,
163         USB_PROC_DCR_RATIO = 2,
164         USB_PROC_DCR_MAX_AMP = 3,
165         USB_PROC_DCR_THRESHOLD = 4,
166         USB_PROC_DCR_ATTACK = 5,
167         USB_PROC_DCR_RELEASE = 6,
168 };
169
170 #define MAX_CHANNELS    10      /* max logical channels */
171
172
173 /*
174  * manual mapping of mixer names
175  * if the mixer topology is too complicated and the parsed names are
176  * ambiguous, add the entries in usbmixer_maps.c.
177  */
178 #include "usbmixer_maps.c"
179
180 /* get the mapped name if the unit matches */
181 static int check_mapped_name(mixer_build_t *state, int unitid, int control, char *buf, int buflen)
182 {
183         const struct usbmix_name_map *p;
184
185         if (! state->map)
186                 return 0;
187
188         for (p = state->map; p->id; p++) {
189                 if (p->id == unitid && p->name &&
190                     (! control || ! p->control || control == p->control)) {
191                         buflen--;
192                         return strlcpy(buf, p->name, buflen);
193                 }
194         }
195         return 0;
196 }
197
198 /* check whether the control should be ignored */
199 static int check_ignored_ctl(mixer_build_t *state, int unitid, int control)
200 {
201         const struct usbmix_name_map *p;
202
203         if (! state->map)
204                 return 0;
205         for (p = state->map; p->id; p++) {
206                 if (p->id == unitid && ! p->name &&
207                     (! control || ! p->control || control == p->control)) {
208                         // printk("ignored control %d:%d\n", unitid, control);
209                         return 1;
210                 }
211         }
212         return 0;
213 }
214
215 /* get the mapped selector source name */
216 static int check_mapped_selector_name(mixer_build_t *state, int unitid,
217                                       int index, char *buf, int buflen)
218 {
219         const struct usbmix_selector_map *p;
220
221         if (! state->selector_map)
222                 return 0;
223         for (p = state->selector_map; p->id; p++) {
224                 if (p->id == unitid && index < p->count)
225                         return strlcpy(buf, p->names[index], buflen);
226         }
227         return 0;
228 }
229
230 /*
231  * find an audio control unit with the given unit id
232  */
233 static void *find_audio_control_unit(mixer_build_t *state, unsigned char unit)
234 {
235         unsigned char *p;
236
237         p = NULL;
238         while ((p = snd_usb_find_desc(state->buffer, state->buflen, p,
239                                       USB_DT_CS_INTERFACE)) != NULL) {
240                 if (p[0] >= 4 && p[2] >= INPUT_TERMINAL && p[2] <= EXTENSION_UNIT && p[3] == unit)
241                         return p;
242         }
243         return NULL;
244 }
245
246
247 /*
248  * copy a string with the given id
249  */
250 static int snd_usb_copy_string_desc(mixer_build_t *state, int index, char *buf, int maxlen)
251 {
252         int len = usb_string(state->chip->dev, index, buf, maxlen - 1);
253         buf[len] = 0;
254         return len;
255 }
256
257 /*
258  * convert from the byte/word on usb descriptor to the zero-based integer
259  */
260 static int convert_signed_value(usb_mixer_elem_info_t *cval, int val)
261 {
262         switch (cval->val_type) {
263         case USB_MIXER_BOOLEAN:
264                 return !!val;
265         case USB_MIXER_INV_BOOLEAN:
266                 return !val;
267         case USB_MIXER_U8:
268                 val &= 0xff;
269                 break;
270         case USB_MIXER_S8:
271                 val &= 0xff;
272                 if (val >= 0x80)
273                         val -= 0x100;
274                 break;
275         case USB_MIXER_U16:
276                 val &= 0xffff;
277                 break;
278         case USB_MIXER_S16:
279                 val &= 0xffff;
280                 if (val >= 0x8000)
281                         val -= 0x10000;
282                 break;
283         }
284         return val;
285 }
286
287 /*
288  * convert from the zero-based int to the byte/word for usb descriptor
289  */
290 static int convert_bytes_value(usb_mixer_elem_info_t *cval, int val)
291 {
292         switch (cval->val_type) {
293         case USB_MIXER_BOOLEAN:
294                 return !!val;
295         case USB_MIXER_INV_BOOLEAN:
296                 return !val;
297         case USB_MIXER_S8:
298         case USB_MIXER_U8:
299                 return val & 0xff;
300         case USB_MIXER_S16:
301         case USB_MIXER_U16:
302                 return val & 0xffff;
303         }
304         return 0; /* not reached */
305 }
306
307 static int get_relative_value(usb_mixer_elem_info_t *cval, int val)
308 {
309         if (! cval->res)
310                 cval->res = 1;
311         if (val < cval->min)
312                 return 0;
313         else if (val > cval->max)
314                 return (cval->max - cval->min) / cval->res;
315         else
316                 return (val - cval->min) / cval->res;
317 }
318
319 static int get_abs_value(usb_mixer_elem_info_t *cval, int val)
320 {
321         if (val < 0)
322                 return cval->min;
323         if (! cval->res)
324                 cval->res = 1;
325         val *= cval->res;
326         val += cval->min;
327         if (val > cval->max)
328                 return cval->max;
329         return val;
330 }
331
332
333 /*
334  * retrieve a mixer value
335  */
336
337 static int get_ctl_value(usb_mixer_elem_info_t *cval, int request, int validx, int *value_ret)
338 {
339         unsigned char buf[2];
340         int val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
341         int timeout = 10;
342
343         while (timeout-- > 0) {
344                 if (snd_usb_ctl_msg(cval->mixer->chip->dev,
345                                     usb_rcvctrlpipe(cval->mixer->chip->dev, 0),
346                                     request,
347                                     USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
348                                     validx, cval->mixer->ctrlif | (cval->id << 8),
349                                     buf, val_len, 100) >= 0) {
350                         *value_ret = convert_signed_value(cval, snd_usb_combine_bytes(buf, val_len));
351                         return 0;
352                 }
353         }
354         snd_printdd(KERN_ERR "cannot get ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
355                     request, validx, cval->mixer->ctrlif | (cval->id << 8), cval->val_type);
356         return -EINVAL;
357 }
358
359 static int get_cur_ctl_value(usb_mixer_elem_info_t *cval, int validx, int *value)
360 {
361         return get_ctl_value(cval, GET_CUR, validx, value);
362 }
363
364 /* channel = 0: master, 1 = first channel */
365 inline static int get_cur_mix_value(usb_mixer_elem_info_t *cval, int channel, int *value)
366 {
367         return get_ctl_value(cval, GET_CUR, (cval->control << 8) | channel, value);
368 }
369
370 /*
371  * set a mixer value
372  */
373
374 static int set_ctl_value(usb_mixer_elem_info_t *cval, int request, int validx, int value_set)
375 {
376         unsigned char buf[2];
377         int val_len = cval->val_type >= USB_MIXER_S16 ? 2 : 1;
378         int timeout = 10;
379
380         value_set = convert_bytes_value(cval, value_set);
381         buf[0] = value_set & 0xff;
382         buf[1] = (value_set >> 8) & 0xff;
383         while (timeout -- > 0)
384                 if (snd_usb_ctl_msg(cval->mixer->chip->dev,
385                                     usb_sndctrlpipe(cval->mixer->chip->dev, 0),
386                                     request,
387                                     USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
388                                     validx, cval->mixer->ctrlif | (cval->id << 8),
389                                     buf, val_len, 100) >= 0)
390                         return 0;
391         snd_printdd(KERN_ERR "cannot set ctl value: req = %#x, wValue = %#x, wIndex = %#x, type = %d, data = %#x/%#x\n",
392                     request, validx, cval->mixer->ctrlif | (cval->id << 8), cval->val_type, buf[0], buf[1]);
393         return -EINVAL;
394 }
395
396 static int set_cur_ctl_value(usb_mixer_elem_info_t *cval, int validx, int value)
397 {
398         return set_ctl_value(cval, SET_CUR, validx, value);
399 }
400
401 inline static int set_cur_mix_value(usb_mixer_elem_info_t *cval, int channel, int value)
402 {
403         return set_ctl_value(cval, SET_CUR, (cval->control << 8) | channel, value);
404 }
405
406
407 /*
408  * parser routines begin here...
409  */
410
411 static int parse_audio_unit(mixer_build_t *state, int unitid);
412
413
414 /*
415  * check if the input/output channel routing is enabled on the given bitmap.
416  * used for mixer unit parser
417  */
418 static int check_matrix_bitmap(unsigned char *bmap, int ich, int och, int num_outs)
419 {
420         int idx = ich * num_outs + och;
421         return bmap[idx >> 3] & (0x80 >> (idx & 7));
422 }
423
424
425 /*
426  * add an alsa control element
427  * search and increment the index until an empty slot is found.
428  *
429  * if failed, give up and free the control instance.
430  */
431
432 static int add_control_to_empty(mixer_build_t *state, snd_kcontrol_t *kctl)
433 {
434         usb_mixer_elem_info_t *cval = kctl->private_data;
435         int err;
436
437         while (snd_ctl_find_id(state->chip->card, &kctl->id))
438                 kctl->id.index++;
439         if ((err = snd_ctl_add(state->chip->card, kctl)) < 0) {
440                 snd_printd(KERN_ERR "cannot add control (err = %d)\n", err);
441                 snd_ctl_free_one(kctl);
442                 return err;
443         }
444         cval->elem_id = &kctl->id;
445         cval->next_id_elem = state->mixer->id_elems[cval->id];
446         state->mixer->id_elems[cval->id] = cval;
447         return 0;
448 }
449
450
451 /*
452  * get a terminal name string
453  */
454
455 static struct iterm_name_combo {
456         int type;
457         char *name;
458 } iterm_names[] = {
459         { 0x0300, "Output" },
460         { 0x0301, "Speaker" },
461         { 0x0302, "Headphone" },
462         { 0x0303, "HMD Audio" },
463         { 0x0304, "Desktop Speaker" },
464         { 0x0305, "Room Speaker" },
465         { 0x0306, "Com Speaker" },
466         { 0x0307, "LFE" },
467         { 0x0600, "External In" },
468         { 0x0601, "Analog In" },
469         { 0x0602, "Digital In" },
470         { 0x0603, "Line" },
471         { 0x0604, "Legacy In" },
472         { 0x0605, "IEC958 In" },
473         { 0x0606, "1394 DA Stream" },
474         { 0x0607, "1394 DV Stream" },
475         { 0x0700, "Embedded" },
476         { 0x0701, "Noise Source" },
477         { 0x0702, "Equalization Noise" },
478         { 0x0703, "CD" },
479         { 0x0704, "DAT" },
480         { 0x0705, "DCC" },
481         { 0x0706, "MiniDisk" },
482         { 0x0707, "Analog Tape" },
483         { 0x0708, "Phonograph" },
484         { 0x0709, "VCR Audio" },
485         { 0x070a, "Video Disk Audio" },
486         { 0x070b, "DVD Audio" },
487         { 0x070c, "TV Tuner Audio" },
488         { 0x070d, "Satellite Rec Audio" },
489         { 0x070e, "Cable Tuner Audio" },
490         { 0x070f, "DSS Audio" },
491         { 0x0710, "Radio Receiver" },
492         { 0x0711, "Radio Transmitter" },
493         { 0x0712, "Multi-Track Recorder" },
494         { 0x0713, "Synthesizer" },
495         { 0 },
496 };
497
498 static int get_term_name(mixer_build_t *state, usb_audio_term_t *iterm,
499                          unsigned char *name, int maxlen, int term_only)
500 {
501         struct iterm_name_combo *names;
502
503         if (iterm->name)
504                 return snd_usb_copy_string_desc(state, iterm->name, name, maxlen);
505
506         /* virtual type - not a real terminal */
507         if (iterm->type >> 16) {
508                 if (term_only)
509                         return 0;
510                 switch (iterm->type >> 16) {
511                 case SELECTOR_UNIT:
512                         strcpy(name, "Selector"); return 8;
513                 case PROCESSING_UNIT:
514                         strcpy(name, "Process Unit"); return 12;
515                 case EXTENSION_UNIT:
516                         strcpy(name, "Ext Unit"); return 8;
517                 case MIXER_UNIT:
518                         strcpy(name, "Mixer"); return 5;
519                 default:
520                         return sprintf(name, "Unit %d", iterm->id);
521                 }
522         }
523
524         switch (iterm->type & 0xff00) {
525         case 0x0100:
526                 strcpy(name, "PCM"); return 3;
527         case 0x0200:
528                 strcpy(name, "Mic"); return 3;
529         case 0x0400:
530                 strcpy(name, "Headset"); return 7;
531         case 0x0500:
532                 strcpy(name, "Phone"); return 5;
533         }
534
535         for (names = iterm_names; names->type; names++)
536                 if (names->type == iterm->type) {
537                         strcpy(name, names->name);
538                         return strlen(names->name);
539                 }
540         return 0;
541 }
542
543
544 /*
545  * parse the source unit recursively until it reaches to a terminal
546  * or a branched unit.
547  */
548 static int check_input_term(mixer_build_t *state, int id, usb_audio_term_t *term)
549 {
550         unsigned char *p1;
551
552         memset(term, 0, sizeof(*term));
553         while ((p1 = find_audio_control_unit(state, id)) != NULL) {
554                 term->id = id;
555                 switch (p1[2]) {
556                 case INPUT_TERMINAL:
557                         term->type = combine_word(p1 + 4);
558                         term->channels = p1[7];
559                         term->chconfig = combine_word(p1 + 8);
560                         term->name = p1[11];
561                         return 0;
562                 case FEATURE_UNIT:
563                         id = p1[4];
564                         break; /* continue to parse */
565                 case MIXER_UNIT:
566                         term->type = p1[2] << 16; /* virtual type */
567                         term->channels = p1[5 + p1[4]];
568                         term->chconfig = combine_word(p1 + 6 + p1[4]);
569                         term->name = p1[p1[0] - 1];
570                         return 0;
571                 case SELECTOR_UNIT:
572                         /* call recursively to retrieve the channel info */
573                         if (check_input_term(state, p1[5], term) < 0)
574                                 return -ENODEV;
575                         term->type = p1[2] << 16; /* virtual type */
576                         term->id = id;
577                         term->name = p1[9 + p1[0] - 1];
578                         return 0;
579                 case PROCESSING_UNIT:
580                 case EXTENSION_UNIT:
581                         if (p1[6] == 1) {
582                                 id = p1[7];
583                                 break; /* continue to parse */
584                         }
585                         term->type = p1[2] << 16; /* virtual type */
586                         term->channels = p1[7 + p1[6]];
587                         term->chconfig = combine_word(p1 + 8 + p1[6]);
588                         term->name = p1[12 + p1[6] + p1[11 + p1[6]]];
589                         return 0;
590                 default:
591                         return -ENODEV;
592                 }
593         }
594         return -ENODEV;
595 }
596
597
598 /*
599  * Feature Unit
600  */
601
602 /* feature unit control information */
603 struct usb_feature_control_info {
604         const char *name;
605         unsigned int type;      /* control type (mute, volume, etc.) */
606 };
607
608 static struct usb_feature_control_info audio_feature_info[] = {
609         { "Mute",               USB_MIXER_INV_BOOLEAN },
610         { "Volume",             USB_MIXER_S16 },
611         { "Tone Control - Bass",        USB_MIXER_S8 },
612         { "Tone Control - Mid",         USB_MIXER_S8 },
613         { "Tone Control - Treble",      USB_MIXER_S8 },
614         { "Graphic Equalizer",          USB_MIXER_S8 }, /* FIXME: not implemeted yet */
615         { "Auto Gain Control",  USB_MIXER_BOOLEAN },
616         { "Delay Control",      USB_MIXER_U16 },
617         { "Bass Boost",         USB_MIXER_BOOLEAN },
618         { "Loudness",           USB_MIXER_BOOLEAN },
619 };
620
621
622 /* private_free callback */
623 static void usb_mixer_elem_free(snd_kcontrol_t *kctl)
624 {
625         if (kctl->private_data) {
626                 kfree(kctl->private_data);
627                 kctl->private_data = NULL;
628         }
629 }
630
631
632 /*
633  * interface to ALSA control for feature/mixer units
634  */
635
636 /*
637  * retrieve the minimum and maximum values for the specified control
638  */
639 static int get_min_max(usb_mixer_elem_info_t *cval, int default_min)
640 {
641         /* for failsafe */
642         cval->min = default_min;
643         cval->max = cval->min + 1;
644         cval->res = 1;
645
646         if (cval->val_type == USB_MIXER_BOOLEAN ||
647             cval->val_type == USB_MIXER_INV_BOOLEAN) {
648                 cval->initialized = 1;
649         } else {
650                 int minchn = 0;
651                 if (cval->cmask) {
652                         int i;
653                         for (i = 0; i < MAX_CHANNELS; i++)
654                                 if (cval->cmask & (1 << i)) {
655                                         minchn = i + 1;
656                                         break;
657                                 }
658                 }
659                 if (get_ctl_value(cval, GET_MAX, (cval->control << 8) | minchn, &cval->max) < 0 ||
660                     get_ctl_value(cval, GET_MIN, (cval->control << 8) | minchn, &cval->min) < 0) {
661                         snd_printd(KERN_ERR "%d:%d: cannot get min/max values for control %d (id %d)\n",
662                                    cval->id, cval->mixer->ctrlif, cval->control, cval->id);
663                         return -EINVAL;
664                 }
665                 if (get_ctl_value(cval, GET_RES, (cval->control << 8) | minchn, &cval->res) < 0) {
666                         cval->res = 1;
667                 } else {
668                         int last_valid_res = cval->res;
669
670                         while (cval->res > 1) {
671                                 if (set_ctl_value(cval, SET_RES, (cval->control << 8) | minchn, cval->res / 2) < 0)
672                                         break;
673                                 cval->res /= 2;
674                         }
675                         if (get_ctl_value(cval, GET_RES, (cval->control << 8) | minchn, &cval->res) < 0)
676                                 cval->res = last_valid_res;
677                 }
678                 if (cval->res == 0)
679                         cval->res = 1;
680                 cval->initialized = 1;
681         }
682         return 0;
683 }
684
685
686 /* get a feature/mixer unit info */
687 static int mixer_ctl_feature_info(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t *uinfo)
688 {
689         usb_mixer_elem_info_t *cval = kcontrol->private_data;
690
691         if (cval->val_type == USB_MIXER_BOOLEAN ||
692             cval->val_type == USB_MIXER_INV_BOOLEAN)
693                 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
694         else
695                 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
696         uinfo->count = cval->channels;
697         if (cval->val_type == USB_MIXER_BOOLEAN ||
698             cval->val_type == USB_MIXER_INV_BOOLEAN) {
699                 uinfo->value.integer.min = 0;
700                 uinfo->value.integer.max = 1;
701         } else {
702                 if (! cval->initialized)
703                         get_min_max(cval,  0);
704                 uinfo->value.integer.min = 0;
705                 uinfo->value.integer.max = (cval->max - cval->min) / cval->res;
706         }
707         return 0;
708 }
709
710 /* get the current value from feature/mixer unit */
711 static int mixer_ctl_feature_get(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
712 {
713         usb_mixer_elem_info_t *cval = kcontrol->private_data;
714         int c, cnt, val, err;
715
716         if (cval->cmask) {
717                 cnt = 0;
718                 for (c = 0; c < MAX_CHANNELS; c++) {
719                         if (cval->cmask & (1 << c)) {
720                                 err = get_cur_mix_value(cval, c + 1, &val);
721                                 if (err < 0) {
722                                         if (cval->mixer->ignore_ctl_error) {
723                                                 ucontrol->value.integer.value[0] = cval->min;
724                                                 return 0;
725                                         }
726                                         snd_printd(KERN_ERR "cannot get current value for control %d ch %d: err = %d\n", cval->control, c + 1, err);
727                                         return err;
728                                 }
729                                 val = get_relative_value(cval, val);
730                                 ucontrol->value.integer.value[cnt] = val;
731                                 cnt++;
732                         }
733                 }
734         } else {
735                 /* master channel */
736                 err = get_cur_mix_value(cval, 0, &val);
737                 if (err < 0) {
738                         if (cval->mixer->ignore_ctl_error) {
739                                 ucontrol->value.integer.value[0] = cval->min;
740                                 return 0;
741                         }
742                         snd_printd(KERN_ERR "cannot get current value for control %d master ch: err = %d\n", cval->control, err);
743                         return err;
744                 }
745                 val = get_relative_value(cval, val);
746                 ucontrol->value.integer.value[0] = val;
747         }
748         return 0;
749 }
750
751 /* put the current value to feature/mixer unit */
752 static int mixer_ctl_feature_put(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
753 {
754         usb_mixer_elem_info_t *cval = kcontrol->private_data;
755         int c, cnt, val, oval, err;
756         int changed = 0;
757
758         if (cval->cmask) {
759                 cnt = 0;
760                 for (c = 0; c < MAX_CHANNELS; c++) {
761                         if (cval->cmask & (1 << c)) {
762                                 err = get_cur_mix_value(cval, c + 1, &oval);
763                                 if (err < 0) {
764                                         if (cval->mixer->ignore_ctl_error)
765                                                 return 0;
766                                         return err;
767                                 }
768                                 val = ucontrol->value.integer.value[cnt];
769                                 val = get_abs_value(cval, val);
770                                 if (oval != val) {
771                                         set_cur_mix_value(cval, c + 1, val);
772                                         changed = 1;
773                                 }
774                                 get_cur_mix_value(cval, c + 1, &val);
775                                 cnt++;
776                         }
777                 }
778         } else {
779                 /* master channel */
780                 err = get_cur_mix_value(cval, 0, &oval);
781                 if (err < 0 && cval->mixer->ignore_ctl_error)
782                         return 0;
783                 if (err < 0)
784                         return err;
785                 val = ucontrol->value.integer.value[0];
786                 val = get_abs_value(cval, val);
787                 if (val != oval) {
788                         set_cur_mix_value(cval, 0, val);
789                         changed = 1;
790                 }
791         }
792         return changed;
793 }
794
795 static snd_kcontrol_new_t usb_feature_unit_ctl = {
796         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
797         .name = "", /* will be filled later manually */
798         .info = mixer_ctl_feature_info,
799         .get = mixer_ctl_feature_get,
800         .put = mixer_ctl_feature_put,
801 };
802
803
804 /*
805  * build a feature control
806  */
807
808 static void build_feature_ctl(mixer_build_t *state, unsigned char *desc,
809                               unsigned int ctl_mask, int control,
810                               usb_audio_term_t *iterm, int unitid)
811 {
812         unsigned int len = 0;
813         int mapped_name = 0;
814         int nameid = desc[desc[0] - 1];
815         snd_kcontrol_t *kctl;
816         usb_mixer_elem_info_t *cval;
817
818         control++; /* change from zero-based to 1-based value */
819
820         if (control == USB_FEATURE_GEQ) {
821                 /* FIXME: not supported yet */
822                 return;
823         }
824
825         if (check_ignored_ctl(state, unitid, control))
826                 return;
827
828         cval = kcalloc(1, sizeof(*cval), GFP_KERNEL);
829         if (! cval) {
830                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
831                 return;
832         }
833         cval->mixer = state->mixer;
834         cval->id = unitid;
835         cval->control = control;
836         cval->cmask = ctl_mask;
837         cval->val_type = audio_feature_info[control-1].type;
838         if (ctl_mask == 0)
839                 cval->channels = 1;     /* master channel */
840         else {
841                 int i, c = 0;
842                 for (i = 0; i < 16; i++)
843                         if (ctl_mask & (1 << i))
844                                 c++;
845                 cval->channels = c;
846         }
847
848         /* get min/max values */
849         get_min_max(cval, 0);
850
851         kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
852         if (! kctl) {
853                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
854                 kfree(cval);
855                 return;
856         }
857         kctl->private_free = usb_mixer_elem_free;
858
859         len = check_mapped_name(state, unitid, control, kctl->id.name, sizeof(kctl->id.name));
860         mapped_name = len != 0;
861         if (! len && nameid)
862                 len = snd_usb_copy_string_desc(state, nameid, kctl->id.name, sizeof(kctl->id.name));
863
864         switch (control) {
865         case USB_FEATURE_MUTE:
866         case USB_FEATURE_VOLUME:
867                 /* determine the control name.  the rule is:
868                  * - if a name id is given in descriptor, use it.
869                  * - if the connected input can be determined, then use the name
870                  *   of terminal type.
871                  * - if the connected output can be determined, use it.
872                  * - otherwise, anonymous name.
873                  */
874                 if (! len) {
875                         len = get_term_name(state, iterm, kctl->id.name, sizeof(kctl->id.name), 1);
876                         if (! len)
877                                 len = get_term_name(state, &state->oterm, kctl->id.name, sizeof(kctl->id.name), 1);
878                         if (! len)
879                                 len = snprintf(kctl->id.name, sizeof(kctl->id.name),
880                                                "Feature %d", unitid);
881                 }
882                 /* determine the stream direction:
883                  * if the connected output is USB stream, then it's likely a
884                  * capture stream.  otherwise it should be playback (hopefully :)
885                  */
886                 if (! mapped_name && ! (state->oterm.type >> 16)) {
887                         if ((state->oterm.type & 0xff00) == 0x0100) {
888                                 len = strlcat(kctl->id.name, " Capture", sizeof(kctl->id.name));
889                         } else {
890                                 len = strlcat(kctl->id.name + len, " Playback", sizeof(kctl->id.name));
891                         }
892                 }
893                 strlcat(kctl->id.name + len, control == USB_FEATURE_MUTE ? " Switch" : " Volume",
894                         sizeof(kctl->id.name));
895                 break;
896
897         default:
898                 if (! len)
899                         strlcpy(kctl->id.name, audio_feature_info[control-1].name,
900                                 sizeof(kctl->id.name));
901                 break;
902         }
903
904         /* quirk for UDA1321/N101 */
905         /* note that detection between firmware 2.1.1.7 (N101) and later 2.1.1.21 */
906         /* is not very clear from datasheets */
907         /* I hope that the min value is -15360 for newer firmware --jk */
908         switch (state->chip->usb_id) {
909         case USB_ID(0x0471, 0x0101):
910         case USB_ID(0x0471, 0x0104):
911         case USB_ID(0x0471, 0x0105):
912         case USB_ID(0x0672, 0x1041):
913                 if (!strcmp(kctl->id.name, "PCM Playback Volume") &&
914                     cval->min == -15616) {
915                         snd_printk("using volume control quirk for the UDA1321/N101 chip\n");
916                         cval->max = -256;
917                 }
918         }
919
920         snd_printdd(KERN_INFO "[%d] FU [%s] ch = %d, val = %d/%d/%d\n",
921                     cval->id, kctl->id.name, cval->channels, cval->min, cval->max, cval->res);
922         add_control_to_empty(state, kctl);
923 }
924
925
926
927 /*
928  * parse a feature unit
929  *
930  * most of controlls are defined here.
931  */
932 static int parse_audio_feature_unit(mixer_build_t *state, int unitid, unsigned char *ftr)
933 {
934         int channels, i, j;
935         usb_audio_term_t iterm;
936         unsigned int master_bits, first_ch_bits;
937         int err, csize;
938
939         if (ftr[0] < 7 || ! (csize = ftr[5]) || ftr[0] < 7 + csize) {
940                 snd_printk(KERN_ERR "usbaudio: unit %u: invalid FEATURE_UNIT descriptor\n", unitid);
941                 return -EINVAL;
942         }
943
944         /* parse the source unit */
945         if ((err = parse_audio_unit(state, ftr[4])) < 0)
946                 return err;
947
948         /* determine the input source type and name */
949         if (check_input_term(state, ftr[4], &iterm) < 0)
950                 return -EINVAL;
951
952         channels = (ftr[0] - 7) / csize - 1;
953
954         master_bits = snd_usb_combine_bytes(ftr + 6, csize);
955         if (channels > 0)
956                 first_ch_bits = snd_usb_combine_bytes(ftr + 6 + csize, csize);
957         else
958                 first_ch_bits = 0;
959         /* check all control types */
960         for (i = 0; i < 10; i++) {
961                 unsigned int ch_bits = 0;
962                 for (j = 0; j < channels; j++) {
963                         unsigned int mask = snd_usb_combine_bytes(ftr + 6 + csize * (j+1), csize);
964                         if (mask & (1 << i))
965                                 ch_bits |= (1 << j);
966                 }
967                 if (ch_bits & 1) /* the first channel must be set (for ease of programming) */
968                         build_feature_ctl(state, ftr, ch_bits, i, &iterm, unitid);
969                 if (master_bits & (1 << i))
970                         build_feature_ctl(state, ftr, 0, i, &iterm, unitid);
971         }
972
973         return 0;
974 }
975
976
977 /*
978  * Mixer Unit
979  */
980
981 /*
982  * build a mixer unit control
983  *
984  * the callbacks are identical with feature unit.
985  * input channel number (zero based) is given in control field instead.
986  */
987
988 static void build_mixer_unit_ctl(mixer_build_t *state, unsigned char *desc,
989                                  int in_pin, int in_ch, int unitid,
990                                  usb_audio_term_t *iterm)
991 {
992         usb_mixer_elem_info_t *cval;
993         unsigned int input_pins = desc[4];
994         unsigned int num_outs = desc[5 + input_pins];
995         unsigned int i, len;
996         snd_kcontrol_t *kctl;
997
998         if (check_ignored_ctl(state, unitid, 0))
999                 return;
1000
1001         cval = kcalloc(1, sizeof(*cval), GFP_KERNEL);
1002         if (! cval)
1003                 return;
1004
1005         cval->mixer = state->mixer;
1006         cval->id = unitid;
1007         cval->control = in_ch + 1; /* based on 1 */
1008         cval->val_type = USB_MIXER_S16;
1009         for (i = 0; i < num_outs; i++) {
1010                 if (check_matrix_bitmap(desc + 9 + input_pins, in_ch, i, num_outs)) {
1011                         cval->cmask |= (1 << i);
1012                         cval->channels++;
1013                 }
1014         }
1015
1016         /* get min/max values */
1017         get_min_max(cval, 0);
1018
1019         kctl = snd_ctl_new1(&usb_feature_unit_ctl, cval);
1020         if (! kctl) {
1021                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1022                 kfree(cval);
1023                 return;
1024         }
1025         kctl->private_free = usb_mixer_elem_free;
1026
1027         len = check_mapped_name(state, unitid, 0, kctl->id.name, sizeof(kctl->id.name));
1028         if (! len)
1029                 len = get_term_name(state, iterm, kctl->id.name, sizeof(kctl->id.name), 0);
1030         if (! len)
1031                 len = sprintf(kctl->id.name, "Mixer Source %d", in_ch + 1);
1032         strlcat(kctl->id.name + len, " Volume", sizeof(kctl->id.name));
1033
1034         snd_printdd(KERN_INFO "[%d] MU [%s] ch = %d, val = %d/%d\n",
1035                     cval->id, kctl->id.name, cval->channels, cval->min, cval->max);
1036         add_control_to_empty(state, kctl);
1037 }
1038
1039
1040 /*
1041  * parse a mixer unit
1042  */
1043 static int parse_audio_mixer_unit(mixer_build_t *state, int unitid, unsigned char *desc)
1044 {
1045         usb_audio_term_t iterm;
1046         int input_pins, num_ins, num_outs;
1047         int pin, ich, err;
1048
1049         if (desc[0] < 11 || ! (input_pins = desc[4]) || ! (num_outs = desc[5 + input_pins])) {
1050                 snd_printk(KERN_ERR "invalid MIXER UNIT descriptor %d\n", unitid);
1051                 return -EINVAL;
1052         }
1053         /* no bmControls field (e.g. Maya44) -> ignore */
1054         if (desc[0] <= 10 + input_pins) {
1055                 snd_printdd(KERN_INFO "MU %d has no bmControls field\n", unitid);
1056                 return 0;
1057         }
1058
1059         num_ins = 0;
1060         ich = 0;
1061         for (pin = 0; pin < input_pins; pin++) {
1062                 err = parse_audio_unit(state, desc[5 + pin]);
1063                 if (err < 0)
1064                         return err;
1065                 err = check_input_term(state, desc[5 + pin], &iterm);
1066                 if (err < 0)
1067                         return err;
1068                 num_ins += iterm.channels;
1069                 for (; ich < num_ins; ++ich) {
1070                         int och, ich_has_controls = 0;
1071
1072                         for (och = 0; och < num_outs; ++och) {
1073                                 if (check_matrix_bitmap(desc + 9 + input_pins,
1074                                                         ich, och, num_outs)) {
1075                                         ich_has_controls = 1;
1076                                         break;
1077                                 }
1078                         }
1079                         if (ich_has_controls)
1080                                 build_mixer_unit_ctl(state, desc, pin, ich,
1081                                                      unitid, &iterm);
1082                 }
1083         }
1084         return 0;
1085 }
1086
1087
1088 /*
1089  * Processing Unit / Extension Unit
1090  */
1091
1092 /* get callback for processing/extension unit */
1093 static int mixer_ctl_procunit_get(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
1094 {
1095         usb_mixer_elem_info_t *cval = kcontrol->private_data;
1096         int err, val;
1097
1098         err = get_cur_ctl_value(cval, cval->control << 8, &val);
1099         if (err < 0 && cval->mixer->ignore_ctl_error) {
1100                 ucontrol->value.integer.value[0] = cval->min;
1101                 return 0;
1102         }
1103         if (err < 0)
1104                 return err;
1105         val = get_relative_value(cval, val);
1106         ucontrol->value.integer.value[0] = val;
1107         return 0;
1108 }
1109
1110 /* put callback for processing/extension unit */
1111 static int mixer_ctl_procunit_put(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
1112 {
1113         usb_mixer_elem_info_t *cval = kcontrol->private_data;
1114         int val, oval, err;
1115
1116         err = get_cur_ctl_value(cval, cval->control << 8, &oval);
1117         if (err < 0) {
1118                 if (cval->mixer->ignore_ctl_error)
1119                         return 0;
1120                 return err;
1121         }
1122         val = ucontrol->value.integer.value[0];
1123         val = get_abs_value(cval, val);
1124         if (val != oval) {
1125                 set_cur_ctl_value(cval, cval->control << 8, val);
1126                 return 1;
1127         }
1128         return 0;
1129 }
1130
1131 /* alsa control interface for processing/extension unit */
1132 static snd_kcontrol_new_t mixer_procunit_ctl = {
1133         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1134         .name = "", /* will be filled later */
1135         .info = mixer_ctl_feature_info,
1136         .get = mixer_ctl_procunit_get,
1137         .put = mixer_ctl_procunit_put,
1138 };
1139
1140
1141 /*
1142  * predefined data for processing units
1143  */
1144 struct procunit_value_info {
1145         int control;
1146         char *suffix;
1147         int val_type;
1148         int min_value;
1149 };
1150
1151 struct procunit_info {
1152         int type;
1153         char *name;
1154         struct procunit_value_info *values;
1155 };
1156
1157 static struct procunit_value_info updown_proc_info[] = {
1158         { USB_PROC_UPDOWN_SWITCH, "Switch", USB_MIXER_BOOLEAN },
1159         { USB_PROC_UPDOWN_MODE_SEL, "Mode Select", USB_MIXER_U8, 1 },
1160         { 0 }
1161 };
1162 static struct procunit_value_info prologic_proc_info[] = {
1163         { USB_PROC_PROLOGIC_SWITCH, "Switch", USB_MIXER_BOOLEAN },
1164         { USB_PROC_PROLOGIC_MODE_SEL, "Mode Select", USB_MIXER_U8, 1 },
1165         { 0 }
1166 };
1167 static struct procunit_value_info threed_enh_proc_info[] = {
1168         { USB_PROC_3DENH_SWITCH, "Switch", USB_MIXER_BOOLEAN },
1169         { USB_PROC_3DENH_SPACE, "Spaciousness", USB_MIXER_U8 },
1170         { 0 }
1171 };
1172 static struct procunit_value_info reverb_proc_info[] = {
1173         { USB_PROC_REVERB_SWITCH, "Switch", USB_MIXER_BOOLEAN },
1174         { USB_PROC_REVERB_LEVEL, "Level", USB_MIXER_U8 },
1175         { USB_PROC_REVERB_TIME, "Time", USB_MIXER_U16 },
1176         { USB_PROC_REVERB_DELAY, "Delay", USB_MIXER_U8 },
1177         { 0 }
1178 };
1179 static struct procunit_value_info chorus_proc_info[] = {
1180         { USB_PROC_CHORUS_SWITCH, "Switch", USB_MIXER_BOOLEAN },
1181         { USB_PROC_CHORUS_LEVEL, "Level", USB_MIXER_U8 },
1182         { USB_PROC_CHORUS_RATE, "Rate", USB_MIXER_U16 },
1183         { USB_PROC_CHORUS_DEPTH, "Depth", USB_MIXER_U16 },
1184         { 0 }
1185 };
1186 static struct procunit_value_info dcr_proc_info[] = {
1187         { USB_PROC_DCR_SWITCH, "Switch", USB_MIXER_BOOLEAN },
1188         { USB_PROC_DCR_RATIO, "Ratio", USB_MIXER_U16 },
1189         { USB_PROC_DCR_MAX_AMP, "Max Amp", USB_MIXER_S16 },
1190         { USB_PROC_DCR_THRESHOLD, "Threshold", USB_MIXER_S16 },
1191         { USB_PROC_DCR_ATTACK, "Attack Time", USB_MIXER_U16 },
1192         { USB_PROC_DCR_RELEASE, "Release Time", USB_MIXER_U16 },
1193         { 0 }
1194 };
1195
1196 static struct procunit_info procunits[] = {
1197         { USB_PROC_UPDOWN, "Up Down", updown_proc_info },
1198         { USB_PROC_PROLOGIC, "Dolby Prologic", prologic_proc_info },
1199         { USB_PROC_3DENH, "3D Stereo Extender", threed_enh_proc_info },
1200         { USB_PROC_REVERB, "Reverb", reverb_proc_info },
1201         { USB_PROC_CHORUS, "Chorus", chorus_proc_info },
1202         { USB_PROC_DCR, "DCR", dcr_proc_info },
1203         { 0 },
1204 };
1205
1206 /*
1207  * build a processing/extension unit
1208  */
1209 static int build_audio_procunit(mixer_build_t *state, int unitid, unsigned char *dsc, struct procunit_info *list, char *name)
1210 {
1211         int num_ins = dsc[6];
1212         usb_mixer_elem_info_t *cval;
1213         snd_kcontrol_t *kctl;
1214         int i, err, nameid, type, len;
1215         struct procunit_info *info;
1216         struct procunit_value_info *valinfo;
1217         static struct procunit_value_info default_value_info[] = {
1218                 { 0x01, "Switch", USB_MIXER_BOOLEAN },
1219                 { 0 }
1220         };
1221         static struct procunit_info default_info = {
1222                 0, NULL, default_value_info
1223         };
1224
1225         if (dsc[0] < 13 || dsc[0] < 13 + num_ins || dsc[0] < num_ins + dsc[11 + num_ins]) {
1226                 snd_printk(KERN_ERR "invalid %s descriptor (id %d)\n", name, unitid);
1227                 return -EINVAL;
1228         }
1229
1230         for (i = 0; i < num_ins; i++) {
1231                 if ((err = parse_audio_unit(state, dsc[7 + i])) < 0)
1232                         return err;
1233         }
1234
1235         type = combine_word(&dsc[4]);
1236         for (info = list; info && info->type; info++)
1237                 if (info->type == type)
1238                         break;
1239         if (! info || ! info->type)
1240                 info = &default_info;
1241
1242         for (valinfo = info->values; valinfo->control; valinfo++) {
1243                 /* FIXME: bitmap might be longer than 8bit */
1244                 if (! (dsc[12 + num_ins] & (1 << (valinfo->control - 1))))
1245                         continue;
1246                 if (check_ignored_ctl(state, unitid, valinfo->control))
1247                         continue;
1248                 cval = kcalloc(1, sizeof(*cval), GFP_KERNEL);
1249                 if (! cval) {
1250                         snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1251                         return -ENOMEM;
1252                 }
1253                 cval->mixer = state->mixer;
1254                 cval->id = unitid;
1255                 cval->control = valinfo->control;
1256                 cval->val_type = valinfo->val_type;
1257                 cval->channels = 1;
1258
1259                 /* get min/max values */
1260                 if (type == USB_PROC_UPDOWN && cval->control == USB_PROC_UPDOWN_MODE_SEL) {
1261                         /* FIXME: hard-coded */
1262                         cval->min = 1;
1263                         cval->max = dsc[15];
1264                         cval->res = 1;
1265                         cval->initialized = 1;
1266                 } else
1267                         get_min_max(cval, valinfo->min_value);
1268
1269                 kctl = snd_ctl_new1(&mixer_procunit_ctl, cval);
1270                 if (! kctl) {
1271                         snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1272                         kfree(cval);
1273                         return -ENOMEM;
1274                 }
1275                 kctl->private_free = usb_mixer_elem_free;
1276
1277                 if (check_mapped_name(state, unitid, cval->control, kctl->id.name, sizeof(kctl->id.name)))
1278                         ;
1279                 else if (info->name)
1280                         strlcpy(kctl->id.name, info->name, sizeof(kctl->id.name));
1281                 else {
1282                         nameid = dsc[12 + num_ins + dsc[11 + num_ins]];
1283                         len = 0;
1284                         if (nameid)
1285                                 len = snd_usb_copy_string_desc(state, nameid, kctl->id.name, sizeof(kctl->id.name));
1286                         if (! len)
1287                                 strlcpy(kctl->id.name, name, sizeof(kctl->id.name));
1288                 }
1289                 strlcat(kctl->id.name, " ", sizeof(kctl->id.name));
1290                 strlcat(kctl->id.name, valinfo->suffix, sizeof(kctl->id.name));
1291
1292                 snd_printdd(KERN_INFO "[%d] PU [%s] ch = %d, val = %d/%d\n",
1293                             cval->id, kctl->id.name, cval->channels, cval->min, cval->max);
1294                 if ((err = add_control_to_empty(state, kctl)) < 0)
1295                         return err;
1296         }
1297         return 0;
1298 }
1299
1300
1301 static int parse_audio_processing_unit(mixer_build_t *state, int unitid, unsigned char *desc)
1302 {
1303         return build_audio_procunit(state, unitid, desc, procunits, "Processing Unit");
1304 }
1305
1306 static int parse_audio_extension_unit(mixer_build_t *state, int unitid, unsigned char *desc)
1307 {
1308         return build_audio_procunit(state, unitid, desc, NULL, "Extension Unit");
1309 }
1310
1311
1312 /*
1313  * Selector Unit
1314  */
1315
1316 /* info callback for selector unit
1317  * use an enumerator type for routing
1318  */
1319 static int mixer_ctl_selector_info(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t *uinfo)
1320 {
1321         usb_mixer_elem_info_t *cval = kcontrol->private_data;
1322         char **itemlist = (char **)kcontrol->private_value;
1323
1324         snd_assert(itemlist, return -EINVAL);
1325         uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
1326         uinfo->count = 1;
1327         uinfo->value.enumerated.items = cval->max;
1328         if ((int)uinfo->value.enumerated.item >= cval->max)
1329                 uinfo->value.enumerated.item = cval->max - 1;
1330         strcpy(uinfo->value.enumerated.name, itemlist[uinfo->value.enumerated.item]);
1331         return 0;
1332 }
1333
1334 /* get callback for selector unit */
1335 static int mixer_ctl_selector_get(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
1336 {
1337         usb_mixer_elem_info_t *cval = kcontrol->private_data;
1338         int val, err;
1339
1340         err = get_cur_ctl_value(cval, 0, &val);
1341         if (err < 0) {
1342                 if (cval->mixer->ignore_ctl_error) {
1343                         ucontrol->value.enumerated.item[0] = 0;
1344                         return 0;
1345                 }
1346                 return err;
1347         }
1348         val = get_relative_value(cval, val);
1349         ucontrol->value.enumerated.item[0] = val;
1350         return 0;
1351 }
1352
1353 /* put callback for selector unit */
1354 static int mixer_ctl_selector_put(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
1355 {
1356         usb_mixer_elem_info_t *cval = kcontrol->private_data;
1357         int val, oval, err;
1358
1359         err = get_cur_ctl_value(cval, 0, &oval);
1360         if (err < 0) {
1361                 if (cval->mixer->ignore_ctl_error)
1362                         return 0;
1363                 return err;
1364         }
1365         val = ucontrol->value.enumerated.item[0];
1366         val = get_abs_value(cval, val);
1367         if (val != oval) {
1368                 set_cur_ctl_value(cval, 0, val);
1369                 return 1;
1370         }
1371         return 0;
1372 }
1373
1374 /* alsa control interface for selector unit */
1375 static snd_kcontrol_new_t mixer_selectunit_ctl = {
1376         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1377         .name = "", /* will be filled later */
1378         .info = mixer_ctl_selector_info,
1379         .get = mixer_ctl_selector_get,
1380         .put = mixer_ctl_selector_put,
1381 };
1382
1383
1384 /* private free callback.
1385  * free both private_data and private_value
1386  */
1387 static void usb_mixer_selector_elem_free(snd_kcontrol_t *kctl)
1388 {
1389         int i, num_ins = 0;
1390
1391         if (kctl->private_data) {
1392                 usb_mixer_elem_info_t *cval = kctl->private_data;
1393                 num_ins = cval->max;
1394                 kfree(cval);
1395                 kctl->private_data = NULL;
1396         }
1397         if (kctl->private_value) {
1398                 char **itemlist = (char **)kctl->private_value;
1399                 for (i = 0; i < num_ins; i++)
1400                         kfree(itemlist[i]);
1401                 kfree(itemlist);
1402                 kctl->private_value = 0;
1403         }
1404 }
1405
1406 /*
1407  * parse a selector unit
1408  */
1409 static int parse_audio_selector_unit(mixer_build_t *state, int unitid, unsigned char *desc)
1410 {
1411         unsigned int num_ins = desc[4];
1412         unsigned int i, nameid, len;
1413         int err;
1414         usb_mixer_elem_info_t *cval;
1415         snd_kcontrol_t *kctl;
1416         char **namelist;
1417
1418         if (! num_ins || desc[0] < 6 + num_ins) {
1419                 snd_printk(KERN_ERR "invalid SELECTOR UNIT descriptor %d\n", unitid);
1420                 return -EINVAL;
1421         }
1422
1423         for (i = 0; i < num_ins; i++) {
1424                 if ((err = parse_audio_unit(state, desc[5 + i])) < 0)
1425                         return err;
1426         }
1427
1428         if (num_ins == 1) /* only one ? nonsense! */
1429                 return 0;
1430
1431         if (check_ignored_ctl(state, unitid, 0))
1432                 return 0;
1433
1434         cval = kcalloc(1, sizeof(*cval), GFP_KERNEL);
1435         if (! cval) {
1436                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1437                 return -ENOMEM;
1438         }
1439         cval->mixer = state->mixer;
1440         cval->id = unitid;
1441         cval->val_type = USB_MIXER_U8;
1442         cval->channels = 1;
1443         cval->min = 1;
1444         cval->max = num_ins;
1445         cval->res = 1;
1446         cval->initialized = 1;
1447
1448         namelist = kmalloc(sizeof(char *) * num_ins, GFP_KERNEL);
1449         if (! namelist) {
1450                 snd_printk(KERN_ERR "cannot malloc\n");
1451                 kfree(cval);
1452                 return -ENOMEM;
1453         }
1454 #define MAX_ITEM_NAME_LEN       64
1455         for (i = 0; i < num_ins; i++) {
1456                 usb_audio_term_t iterm;
1457                 len = 0;
1458                 namelist[i] = kmalloc(MAX_ITEM_NAME_LEN, GFP_KERNEL);
1459                 if (! namelist[i]) {
1460                         snd_printk(KERN_ERR "cannot malloc\n");
1461                         while (--i > 0)
1462                                 kfree(namelist[i]);
1463                         kfree(namelist);
1464                         kfree(cval);
1465                         return -ENOMEM;
1466                 }
1467                 len = check_mapped_selector_name(state, unitid, i, namelist[i],
1468                                                  MAX_ITEM_NAME_LEN);
1469                 if (! len && check_input_term(state, desc[5 + i], &iterm) >= 0)
1470                         len = get_term_name(state, &iterm, namelist[i], MAX_ITEM_NAME_LEN, 0);
1471                 if (! len)
1472                         sprintf(namelist[i], "Input %d", i);
1473         }
1474
1475         kctl = snd_ctl_new1(&mixer_selectunit_ctl, cval);
1476         if (! kctl) {
1477                 snd_printk(KERN_ERR "cannot malloc kcontrol\n");
1478                 kfree(cval);
1479                 return -ENOMEM;
1480         }
1481         kctl->private_value = (unsigned long)namelist;
1482         kctl->private_free = usb_mixer_selector_elem_free;
1483
1484         nameid = desc[desc[0] - 1];
1485         len = check_mapped_name(state, unitid, 0, kctl->id.name, sizeof(kctl->id.name));
1486         if (len)
1487                 ;
1488         else if (nameid)
1489                 snd_usb_copy_string_desc(state, nameid, kctl->id.name, sizeof(kctl->id.name));
1490         else {
1491                 len = get_term_name(state, &state->oterm,
1492                                     kctl->id.name, sizeof(kctl->id.name), 0);
1493                 if (! len)
1494                         strlcpy(kctl->id.name, "USB", sizeof(kctl->id.name));
1495
1496                 if ((state->oterm.type & 0xff00) == 0x0100)
1497                         strlcat(kctl->id.name, " Capture Source", sizeof(kctl->id.name));
1498                 else
1499                         strlcat(kctl->id.name, " Playback Source", sizeof(kctl->id.name));
1500         }
1501
1502         snd_printdd(KERN_INFO "[%d] SU [%s] items = %d\n",
1503                     cval->id, kctl->id.name, num_ins);
1504         if ((err = add_control_to_empty(state, kctl)) < 0)
1505                 return err;
1506
1507         return 0;
1508 }
1509
1510
1511 /*
1512  * parse an audio unit recursively
1513  */
1514
1515 static int parse_audio_unit(mixer_build_t *state, int unitid)
1516 {
1517         unsigned char *p1;
1518
1519         if (test_and_set_bit(unitid, state->unitbitmap))
1520                 return 0; /* the unit already visited */
1521
1522         p1 = find_audio_control_unit(state, unitid);
1523         if (!p1) {
1524                 snd_printk(KERN_ERR "usbaudio: unit %d not found!\n", unitid);
1525                 return -EINVAL;
1526         }
1527
1528         switch (p1[2]) {
1529         case INPUT_TERMINAL:
1530                 return 0; /* NOP */
1531         case MIXER_UNIT:
1532                 return parse_audio_mixer_unit(state, unitid, p1);
1533         case SELECTOR_UNIT:
1534                 return parse_audio_selector_unit(state, unitid, p1);
1535         case FEATURE_UNIT:
1536                 return parse_audio_feature_unit(state, unitid, p1);
1537         case PROCESSING_UNIT:
1538                 return parse_audio_processing_unit(state, unitid, p1);
1539         case EXTENSION_UNIT:
1540                 return parse_audio_extension_unit(state, unitid, p1);
1541         default:
1542                 snd_printk(KERN_ERR "usbaudio: unit %u: unexpected type 0x%02x\n", unitid, p1[2]);
1543                 return -EINVAL;
1544         }
1545 }
1546
1547 static void snd_usb_mixer_free(struct usb_mixer_interface *mixer)
1548 {
1549         kfree(mixer->id_elems);
1550         if (mixer->urb) {
1551                 kfree(mixer->urb->transfer_buffer);
1552                 usb_free_urb(mixer->urb);
1553         }
1554         if (mixer->rc_urb)
1555                 usb_free_urb(mixer->rc_urb);
1556         kfree(mixer->rc_setup_packet);
1557         kfree(mixer);
1558 }
1559
1560 static int snd_usb_mixer_dev_free(snd_device_t *device)
1561 {
1562         struct usb_mixer_interface *mixer = device->device_data;
1563         snd_usb_mixer_free(mixer);
1564         return 0;
1565 }
1566
1567 /*
1568  * create mixer controls
1569  *
1570  * walk through all OUTPUT_TERMINAL descriptors to search for mixers
1571  */
1572 static int snd_usb_mixer_controls(struct usb_mixer_interface *mixer)
1573 {
1574         unsigned char *desc;
1575         mixer_build_t state;
1576         int err;
1577         const struct usbmix_ctl_map *map;
1578         struct usb_host_interface *hostif;
1579
1580         hostif = &usb_ifnum_to_if(mixer->chip->dev, mixer->ctrlif)->altsetting[0];
1581         memset(&state, 0, sizeof(state));
1582         state.chip = mixer->chip;
1583         state.mixer = mixer;
1584         state.buffer = hostif->extra;
1585         state.buflen = hostif->extralen;
1586
1587         /* check the mapping table */
1588         for (map = usbmix_ctl_maps; map->id; map++) {
1589                 if (map->id == state.chip->usb_id) {
1590                         state.map = map->map;
1591                         state.selector_map = map->selector_map;
1592                         mixer->ignore_ctl_error = map->ignore_ctl_error;
1593                         break;
1594                 }
1595         }
1596
1597         desc = NULL;
1598         while ((desc = snd_usb_find_csint_desc(hostif->extra, hostif->extralen, desc, OUTPUT_TERMINAL)) != NULL) {
1599                 if (desc[0] < 9)
1600                         continue; /* invalid descriptor? */
1601                 set_bit(desc[3], state.unitbitmap);  /* mark terminal ID as visited */
1602                 state.oterm.id = desc[3];
1603                 state.oterm.type = combine_word(&desc[4]);
1604                 state.oterm.name = desc[8];
1605                 err = parse_audio_unit(&state, desc[7]);
1606                 if (err < 0)
1607                         return err;
1608         }
1609         return 0;
1610 }
1611
1612 static void snd_usb_mixer_notify_id(struct usb_mixer_interface *mixer,
1613                                     int unitid)
1614 {
1615         usb_mixer_elem_info_t *info;
1616
1617         for (info = mixer->id_elems[unitid]; info; info = info->next_id_elem)
1618                 snd_ctl_notify(mixer->chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
1619                                info->elem_id);
1620 }
1621
1622 static void snd_usb_mixer_memory_change(struct usb_mixer_interface *mixer,
1623                                         int unitid)
1624 {
1625         /* SB remote control */
1626         if (mixer->rc_type != RC_NONE && unitid == 0) {
1627                 /* read control code from device memory */
1628                 mixer->rc_urb->dev = mixer->chip->dev;
1629                 usb_submit_urb(mixer->rc_urb, GFP_ATOMIC);
1630         }
1631 }
1632
1633 static void snd_usb_mixer_status_complete(struct urb *urb, struct pt_regs *regs)
1634 {
1635         struct usb_mixer_interface *mixer = urb->context;
1636
1637         if (urb->status == 0) {
1638                 u8 *buf = urb->transfer_buffer;
1639                 int i;
1640
1641                 for (i = urb->actual_length; i >= 2; buf += 2, i -= 2) {
1642                         snd_printd(KERN_DEBUG "status interrupt: %02x %02x\n",
1643                                    buf[0], buf[1]);
1644                         /* ignore any notifications not from the control interface */
1645                         if ((buf[0] & 0x0f) != 0)
1646                                 continue;
1647                         if (!(buf[0] & 0x40))
1648                                 snd_usb_mixer_notify_id(mixer, buf[1]);
1649                         else
1650                                 snd_usb_mixer_memory_change(mixer, buf[1]);
1651                 }
1652         }
1653         if (urb->status != -ENOENT && urb->status != -ECONNRESET) {
1654                 urb->dev = mixer->chip->dev;
1655                 usb_submit_urb(urb, GFP_ATOMIC);
1656         }
1657 }
1658
1659 /* create the handler for the optional status interrupt endpoint */
1660 static int snd_usb_mixer_status_create(struct usb_mixer_interface *mixer)
1661 {
1662         struct usb_host_interface *hostif;
1663         struct usb_endpoint_descriptor *ep;
1664         void *transfer_buffer;
1665         int buffer_length;
1666         unsigned int epnum;
1667
1668         hostif = &usb_ifnum_to_if(mixer->chip->dev, mixer->ctrlif)->altsetting[0];
1669         /* we need one interrupt input endpoint */
1670         if (get_iface_desc(hostif)->bNumEndpoints < 1)
1671                 return 0;
1672         ep = get_endpoint(hostif, 0);
1673         if ((ep->bEndpointAddress & USB_ENDPOINT_DIR_MASK) != USB_DIR_IN ||
1674             (ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_INT)
1675                 return 0;
1676
1677         epnum = ep->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
1678         buffer_length = le16_to_cpu(ep->wMaxPacketSize);
1679         transfer_buffer = kmalloc(buffer_length, GFP_KERNEL);
1680         if (!transfer_buffer)
1681                 return -ENOMEM;
1682         mixer->urb = usb_alloc_urb(0, GFP_KERNEL);
1683         if (!mixer->urb) {
1684                 kfree(transfer_buffer);
1685                 return -ENOMEM;
1686         }
1687         usb_fill_int_urb(mixer->urb, mixer->chip->dev,
1688                          usb_rcvintpipe(mixer->chip->dev, epnum),
1689                          transfer_buffer, buffer_length,
1690                          snd_usb_mixer_status_complete, mixer, ep->bInterval);
1691         usb_submit_urb(mixer->urb, GFP_KERNEL);
1692         return 0;
1693 }
1694
1695 static void snd_usb_soundblaster_remote_complete(struct urb *urb,
1696                                                  struct pt_regs *regs)
1697 {
1698         struct usb_mixer_interface *mixer = urb->context;
1699         /*
1700          * format of remote control data:
1701          * Extigy:      xx 00
1702          * Audigy 2 NX: 06 80 xx 00 00 00
1703          */
1704         int offset = mixer->rc_type == RC_EXTIGY ? 0 : 2;
1705         u32 code;
1706
1707         if (urb->status < 0 || urb->actual_length <= offset)
1708                 return;
1709         code = mixer->rc_buffer[offset];
1710         /* the Mute button actually changes the mixer control */
1711         if (code == 13)
1712                 snd_usb_mixer_notify_id(mixer, 18);
1713         mixer->rc_code = code;
1714         wmb();
1715         wake_up(&mixer->rc_waitq);
1716 }
1717
1718 static int snd_usb_sbrc_hwdep_open(snd_hwdep_t *hw, struct file *file)
1719 {
1720         struct usb_mixer_interface *mixer = hw->private_data;
1721
1722         if (test_and_set_bit(0, &mixer->rc_hwdep_open))
1723                 return -EBUSY;
1724         return 0;
1725 }
1726
1727 static int snd_usb_sbrc_hwdep_release(snd_hwdep_t *hw, struct file *file)
1728 {
1729         struct usb_mixer_interface *mixer = hw->private_data;
1730
1731         clear_bit(0, &mixer->rc_hwdep_open);
1732         smp_mb__after_clear_bit();
1733         return 0;
1734 }
1735
1736 static long snd_usb_sbrc_hwdep_read(snd_hwdep_t *hw, char __user *buf,
1737                                      long count, loff_t *offset)
1738 {
1739         struct usb_mixer_interface *mixer = hw->private_data;
1740         int err;
1741         u32 rc_code;
1742
1743         if (count != 1 && count != 4)
1744                 return -EINVAL;
1745         err = wait_event_interruptible(mixer->rc_waitq,
1746                                        (rc_code = xchg(&mixer->rc_code, 0)) != 0);
1747         if (err == 0) {
1748                 if (count == 1)
1749                         err = put_user(rc_code, buf);
1750                 else
1751                         err = put_user(rc_code, (u32 __user *)buf);
1752         }
1753         return err < 0 ? err : count;
1754 }
1755
1756 static unsigned int snd_usb_sbrc_hwdep_poll(snd_hwdep_t *hw, struct file *file,
1757                                             poll_table *wait)
1758 {
1759         struct usb_mixer_interface *mixer = hw->private_data;
1760
1761         poll_wait(file, &mixer->rc_waitq, wait);
1762         return mixer->rc_code ? POLLIN | POLLRDNORM : 0;
1763 }
1764
1765 static int snd_usb_soundblaster_remote_init(struct usb_mixer_interface *mixer)
1766 {
1767         snd_hwdep_t *hwdep;
1768         int err, len;
1769
1770         switch (mixer->chip->usb_id) {
1771         case USB_ID(0x041e, 0x3000):
1772                 mixer->rc_type = RC_EXTIGY;
1773                 len = 2;
1774                 break;
1775         case USB_ID(0x041e, 0x3020):
1776                 mixer->rc_type = RC_AUDIGY2NX;
1777                 len = 6;
1778                 break;
1779         default:
1780                 return 0;
1781         }
1782
1783         init_waitqueue_head(&mixer->rc_waitq);
1784         err = snd_hwdep_new(mixer->chip->card, "SB remote control", 0, &hwdep);
1785         if (err < 0)
1786                 return err;
1787         snprintf(hwdep->name, sizeof(hwdep->name),
1788                  "%s remote control", mixer->chip->card->shortname);
1789         hwdep->iface = SNDRV_HWDEP_IFACE_SB_RC;
1790         hwdep->private_data = mixer;
1791         hwdep->ops.read = snd_usb_sbrc_hwdep_read;
1792         hwdep->ops.open = snd_usb_sbrc_hwdep_open;
1793         hwdep->ops.release = snd_usb_sbrc_hwdep_release;
1794         hwdep->ops.poll = snd_usb_sbrc_hwdep_poll;
1795
1796         mixer->rc_urb = usb_alloc_urb(0, GFP_KERNEL);
1797         if (!mixer->rc_urb)
1798                 return -ENOMEM;
1799         mixer->rc_setup_packet = kmalloc(sizeof(*mixer->rc_setup_packet), GFP_KERNEL);
1800         if (!mixer->rc_setup_packet) {
1801                 usb_free_urb(mixer->rc_urb);
1802                 mixer->rc_urb = NULL;
1803                 return -ENOMEM;
1804         }
1805         mixer->rc_setup_packet->bRequestType =
1806                 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE;
1807         mixer->rc_setup_packet->bRequest = GET_MEM;
1808         mixer->rc_setup_packet->wValue = cpu_to_le16(0);
1809         mixer->rc_setup_packet->wIndex = cpu_to_le16(0);
1810         mixer->rc_setup_packet->wLength = cpu_to_le16(len);
1811         usb_fill_control_urb(mixer->rc_urb, mixer->chip->dev,
1812                              usb_rcvctrlpipe(mixer->chip->dev, 0),
1813                              (u8*)mixer->rc_setup_packet, mixer->rc_buffer, len,
1814                              snd_usb_soundblaster_remote_complete, mixer);
1815         return 0;
1816 }
1817
1818 static int snd_audigy2nx_led_info(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t *uinfo)
1819 {
1820         uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
1821         uinfo->count = 1;
1822         uinfo->value.integer.min = 0;
1823         uinfo->value.integer.max = 1;
1824         return 0;
1825 }
1826
1827 static int snd_audigy2nx_led_get(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
1828 {
1829         struct usb_mixer_interface *mixer = snd_kcontrol_chip(kcontrol);
1830         int index = kcontrol->private_value;
1831
1832         ucontrol->value.integer.value[0] = mixer->audigy2nx_leds[index];
1833         return 0;
1834 }
1835
1836 static int snd_audigy2nx_led_put(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
1837 {
1838         struct usb_mixer_interface *mixer = snd_kcontrol_chip(kcontrol);
1839         int index = kcontrol->private_value;
1840         int value = ucontrol->value.integer.value[0];
1841         int err, changed;
1842
1843         if (value > 1)
1844                 return -EINVAL;
1845         changed = value != mixer->audigy2nx_leds[index];
1846         err = snd_usb_ctl_msg(mixer->chip->dev,
1847                               usb_sndctrlpipe(mixer->chip->dev, 0), 0x24,
1848                               USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_OTHER,
1849                               value, index + 2, NULL, 0, 100);
1850         if (err < 0)
1851                 return err;
1852         mixer->audigy2nx_leds[index] = value;
1853         return changed;
1854 }
1855
1856 static snd_kcontrol_new_t snd_audigy2nx_controls[] = {
1857         {
1858                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1859                 .name = "CMSS LED Switch",
1860                 .info = snd_audigy2nx_led_info,
1861                 .get = snd_audigy2nx_led_get,
1862                 .put = snd_audigy2nx_led_put,
1863                 .private_value = 0,
1864         },
1865         {
1866                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1867                 .name = "Power LED Switch",
1868                 .info = snd_audigy2nx_led_info,
1869                 .get = snd_audigy2nx_led_get,
1870                 .put = snd_audigy2nx_led_put,
1871                 .private_value = 1,
1872         },
1873         {
1874                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
1875                 .name = "Dolby Digital LED Switch",
1876                 .info = snd_audigy2nx_led_info,
1877                 .get = snd_audigy2nx_led_get,
1878                 .put = snd_audigy2nx_led_put,
1879                 .private_value = 2,
1880         },
1881 };
1882
1883 static int snd_audigy2nx_controls_create(struct usb_mixer_interface *mixer)
1884 {
1885         int i, err;
1886
1887         for (i = 0; i < ARRAY_SIZE(snd_audigy2nx_controls); ++i) {
1888                 err = snd_ctl_add(mixer->chip->card,
1889                                   snd_ctl_new1(&snd_audigy2nx_controls[i], mixer));
1890                 if (err < 0)
1891                         return err;
1892         }
1893         mixer->audigy2nx_leds[1] = 1; /* Power LED is on by default */
1894         return 0;
1895 }
1896
1897 int snd_usb_create_mixer(snd_usb_audio_t *chip, int ctrlif)
1898 {
1899         static snd_device_ops_t dev_ops = {
1900                 .dev_free = snd_usb_mixer_dev_free
1901         };
1902         struct usb_mixer_interface *mixer;
1903         int err;
1904
1905         strcpy(chip->card->mixername, "USB Mixer");
1906
1907         mixer = kcalloc(1, sizeof(*mixer), GFP_KERNEL);
1908         if (!mixer)
1909                 return -ENOMEM;
1910         mixer->chip = chip;
1911         mixer->ctrlif = ctrlif;
1912 #ifdef IGNORE_CTL_ERROR
1913         mixer->ignore_ctl_error = 1;
1914 #endif
1915         mixer->id_elems = kcalloc(256, sizeof(*mixer->id_elems), GFP_KERNEL);
1916         if (!mixer->id_elems) {
1917                 kfree(mixer);
1918                 return -ENOMEM;
1919         }
1920
1921         if ((err = snd_usb_mixer_controls(mixer)) < 0 ||
1922             (err = snd_usb_mixer_status_create(mixer)) < 0)
1923                 goto _error;
1924
1925         if ((err = snd_usb_soundblaster_remote_init(mixer)) < 0)
1926                 goto _error;
1927
1928         if (mixer->chip->usb_id == USB_ID(0x041e, 0x3020)) {
1929                 if ((err = snd_audigy2nx_controls_create(mixer)) < 0)
1930                         goto _error;
1931         }
1932
1933         err = snd_device_new(chip->card, SNDRV_DEV_LOWLEVEL, mixer, &dev_ops);
1934         if (err < 0)
1935                 goto _error;
1936         list_add(&mixer->list, &chip->mixer_list);
1937         return 0;
1938
1939 _error:
1940         snd_usb_mixer_free(mixer);
1941         return err;
1942 }
1943
1944 void snd_usb_mixer_disconnect(struct list_head *p)
1945 {
1946         struct usb_mixer_interface *mixer;
1947         
1948         mixer = list_entry(p, struct usb_mixer_interface, list);
1949         if (mixer->urb)
1950                 usb_kill_urb(mixer->urb);
1951         if (mixer->rc_urb)
1952                 usb_kill_urb(mixer->rc_urb);
1953 }