[ALSA] Changed Jaroslav Kysela's e-mail from perex@suse.cz to perex@perex.cz
[linux-2.6.git] / sound / drivers / dummy.c
1 /*
2  *  Dummy soundcard
3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4  *
5  *   This program is free software; you can redistribute it and/or modify
6  *   it under the terms of the GNU General Public License as published by
7  *   the Free Software Foundation; either version 2 of the License, or
8  *   (at your option) any later version.
9  *
10  *   This program is distributed in the hope that it will be useful,
11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  *   GNU General Public License for more details.
14  *
15  *   You should have received a copy of the GNU General Public License
16  *   along with this program; if not, write to the Free Software
17  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
18  *
19  */
20
21 #include <sound/driver.h>
22 #include <linux/init.h>
23 #include <linux/err.h>
24 #include <linux/platform_device.h>
25 #include <linux/jiffies.h>
26 #include <linux/slab.h>
27 #include <linux/time.h>
28 #include <linux/wait.h>
29 #include <linux/moduleparam.h>
30 #include <sound/core.h>
31 #include <sound/control.h>
32 #include <sound/tlv.h>
33 #include <sound/pcm.h>
34 #include <sound/rawmidi.h>
35 #include <sound/initval.h>
36
37 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
38 MODULE_DESCRIPTION("Dummy soundcard (/dev/null)");
39 MODULE_LICENSE("GPL");
40 MODULE_SUPPORTED_DEVICE("{{ALSA,Dummy soundcard}}");
41
42 #define MAX_PCM_DEVICES         4
43 #define MAX_PCM_SUBSTREAMS      16
44 #define MAX_MIDI_DEVICES        2
45
46 #if 0 /* emu10k1 emulation */
47 #define MAX_BUFFER_SIZE         (128 * 1024)
48 static int emu10k1_playback_constraints(struct snd_pcm_runtime *runtime)
49 {
50         int err;
51         if ((err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
52                 return err;
53         if ((err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256, UINT_MAX)) < 0)
54                 return err;
55         return 0;
56 }
57 #define add_playback_constraints emu10k1_playback_constraints
58 #endif
59
60 #if 0 /* RME9652 emulation */
61 #define MAX_BUFFER_SIZE         (26 * 64 * 1024)
62 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S32_LE
63 #define USE_CHANNELS_MIN        26
64 #define USE_CHANNELS_MAX        26
65 #define USE_PERIODS_MIN         2
66 #define USE_PERIODS_MAX         2
67 #endif
68
69 #if 0 /* ICE1712 emulation */
70 #define MAX_BUFFER_SIZE         (256 * 1024)
71 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S32_LE
72 #define USE_CHANNELS_MIN        10
73 #define USE_CHANNELS_MAX        10
74 #define USE_PERIODS_MIN         1
75 #define USE_PERIODS_MAX         1024
76 #endif
77
78 #if 0 /* UDA1341 emulation */
79 #define MAX_BUFFER_SIZE         (16380)
80 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S16_LE
81 #define USE_CHANNELS_MIN        2
82 #define USE_CHANNELS_MAX        2
83 #define USE_PERIODS_MIN         2
84 #define USE_PERIODS_MAX         255
85 #endif
86
87 #if 0 /* simple AC97 bridge (intel8x0) with 48kHz AC97 only codec */
88 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S16_LE
89 #define USE_CHANNELS_MIN        2
90 #define USE_CHANNELS_MAX        2
91 #define USE_RATE                SNDRV_PCM_RATE_48000
92 #define USE_RATE_MIN            48000
93 #define USE_RATE_MAX            48000
94 #endif
95
96 #if 0 /* CA0106 */
97 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S16_LE
98 #define USE_CHANNELS_MIN        2
99 #define USE_CHANNELS_MAX        2
100 #define USE_RATE                (SNDRV_PCM_RATE_48000|SNDRV_PCM_RATE_96000|SNDRV_PCM_RATE_192000) 
101 #define USE_RATE_MIN            48000 
102 #define USE_RATE_MAX            192000
103 #define MAX_BUFFER_SIZE         ((65536-64)*8)
104 #define MAX_PERIOD_SIZE         (65536-64)
105 #define USE_PERIODS_MIN         2
106 #define USE_PERIODS_MAX         8
107 #endif
108
109
110 /* defaults */
111 #ifndef MAX_BUFFER_SIZE
112 #define MAX_BUFFER_SIZE         (64*1024)
113 #endif
114 #ifndef MAX_PERIOD_SIZE
115 #define MAX_PERIOD_SIZE         MAX_BUFFER_SIZE
116 #endif
117 #ifndef USE_FORMATS
118 #define USE_FORMATS             (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE)
119 #endif
120 #ifndef USE_RATE
121 #define USE_RATE                SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000
122 #define USE_RATE_MIN            5500
123 #define USE_RATE_MAX            48000
124 #endif
125 #ifndef USE_CHANNELS_MIN
126 #define USE_CHANNELS_MIN        1
127 #endif
128 #ifndef USE_CHANNELS_MAX
129 #define USE_CHANNELS_MAX        2
130 #endif
131 #ifndef USE_PERIODS_MIN
132 #define USE_PERIODS_MIN         1
133 #endif
134 #ifndef USE_PERIODS_MAX
135 #define USE_PERIODS_MAX         1024
136 #endif
137 #ifndef add_playback_constraints
138 #define add_playback_constraints(x) 0
139 #endif
140 #ifndef add_capture_constraints
141 #define add_capture_constraints(x) 0
142 #endif
143
144 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
145 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
146 static int enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
147 static int pcm_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
148 static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8};
149 //static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 2};
150
151 module_param_array(index, int, NULL, 0444);
152 MODULE_PARM_DESC(index, "Index value for dummy soundcard.");
153 module_param_array(id, charp, NULL, 0444);
154 MODULE_PARM_DESC(id, "ID string for dummy soundcard.");
155 module_param_array(enable, bool, NULL, 0444);
156 MODULE_PARM_DESC(enable, "Enable this dummy soundcard.");
157 module_param_array(pcm_devs, int, NULL, 0444);
158 MODULE_PARM_DESC(pcm_devs, "PCM devices # (0-4) for dummy driver.");
159 module_param_array(pcm_substreams, int, NULL, 0444);
160 MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-16) for dummy driver.");
161 //module_param_array(midi_devs, int, NULL, 0444);
162 //MODULE_PARM_DESC(midi_devs, "MIDI devices # (0-2) for dummy driver.");
163
164 static struct platform_device *devices[SNDRV_CARDS];
165
166 #define MIXER_ADDR_MASTER       0
167 #define MIXER_ADDR_LINE         1
168 #define MIXER_ADDR_MIC          2
169 #define MIXER_ADDR_SYNTH        3
170 #define MIXER_ADDR_CD           4
171 #define MIXER_ADDR_LAST         4
172
173 struct snd_dummy {
174         struct snd_card *card;
175         struct snd_pcm *pcm;
176         spinlock_t mixer_lock;
177         int mixer_volume[MIXER_ADDR_LAST+1][2];
178         int capture_source[MIXER_ADDR_LAST+1][2];
179 };
180
181 struct snd_dummy_pcm {
182         struct snd_dummy *dummy;
183         spinlock_t lock;
184         struct timer_list timer;
185         unsigned int pcm_size;
186         unsigned int pcm_count;
187         unsigned int pcm_bps;           /* bytes per second */
188         unsigned int pcm_jiffie;        /* bytes per one jiffie */
189         unsigned int pcm_irq_pos;       /* IRQ position */
190         unsigned int pcm_buf_pos;       /* position in buffer */
191         struct snd_pcm_substream *substream;
192 };
193
194
195 static inline void snd_card_dummy_pcm_timer_start(struct snd_dummy_pcm *dpcm)
196 {
197         dpcm->timer.expires = 1 + jiffies;
198         add_timer(&dpcm->timer);
199 }
200
201 static inline void snd_card_dummy_pcm_timer_stop(struct snd_dummy_pcm *dpcm)
202 {
203         del_timer(&dpcm->timer);
204 }
205
206 static int snd_card_dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
207 {
208         struct snd_pcm_runtime *runtime = substream->runtime;
209         struct snd_dummy_pcm *dpcm = runtime->private_data;
210         int err = 0;
211
212         spin_lock(&dpcm->lock);
213         switch (cmd) {
214         case SNDRV_PCM_TRIGGER_START:
215         case SNDRV_PCM_TRIGGER_RESUME:
216                 snd_card_dummy_pcm_timer_start(dpcm);
217                 break;
218         case SNDRV_PCM_TRIGGER_STOP:
219         case SNDRV_PCM_TRIGGER_SUSPEND:
220                 snd_card_dummy_pcm_timer_stop(dpcm);
221                 break;
222         default:
223                 err = -EINVAL;
224                 break;
225         }
226         spin_unlock(&dpcm->lock);
227         return 0;
228 }
229
230 static int snd_card_dummy_pcm_prepare(struct snd_pcm_substream *substream)
231 {
232         struct snd_pcm_runtime *runtime = substream->runtime;
233         struct snd_dummy_pcm *dpcm = runtime->private_data;
234         unsigned int bps;
235
236         bps = runtime->rate * runtime->channels;
237         bps *= snd_pcm_format_width(runtime->format);
238         bps /= 8;
239         if (bps <= 0)
240                 return -EINVAL;
241         dpcm->pcm_bps = bps;
242         dpcm->pcm_jiffie = bps / HZ;
243         dpcm->pcm_size = snd_pcm_lib_buffer_bytes(substream);
244         dpcm->pcm_count = snd_pcm_lib_period_bytes(substream);
245         dpcm->pcm_irq_pos = 0;
246         dpcm->pcm_buf_pos = 0;
247         return 0;
248 }
249
250 static void snd_card_dummy_pcm_timer_function(unsigned long data)
251 {
252         struct snd_dummy_pcm *dpcm = (struct snd_dummy_pcm *)data;
253         unsigned long flags;
254         
255         spin_lock_irqsave(&dpcm->lock, flags);
256         dpcm->timer.expires = 1 + jiffies;
257         add_timer(&dpcm->timer);
258         dpcm->pcm_irq_pos += dpcm->pcm_jiffie;
259         dpcm->pcm_buf_pos += dpcm->pcm_jiffie;
260         dpcm->pcm_buf_pos %= dpcm->pcm_size;
261         if (dpcm->pcm_irq_pos >= dpcm->pcm_count) {
262                 dpcm->pcm_irq_pos %= dpcm->pcm_count;
263                 spin_unlock_irqrestore(&dpcm->lock, flags);
264                 snd_pcm_period_elapsed(dpcm->substream);
265         } else
266                 spin_unlock_irqrestore(&dpcm->lock, flags);
267 }
268
269 static snd_pcm_uframes_t snd_card_dummy_pcm_pointer(struct snd_pcm_substream *substream)
270 {
271         struct snd_pcm_runtime *runtime = substream->runtime;
272         struct snd_dummy_pcm *dpcm = runtime->private_data;
273
274         return bytes_to_frames(runtime, dpcm->pcm_buf_pos);
275 }
276
277 static struct snd_pcm_hardware snd_card_dummy_playback =
278 {
279         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
280                                  SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_MMAP_VALID),
281         .formats =              USE_FORMATS,
282         .rates =                USE_RATE,
283         .rate_min =             USE_RATE_MIN,
284         .rate_max =             USE_RATE_MAX,
285         .channels_min =         USE_CHANNELS_MIN,
286         .channels_max =         USE_CHANNELS_MAX,
287         .buffer_bytes_max =     MAX_BUFFER_SIZE,
288         .period_bytes_min =     64,
289         .period_bytes_max =     MAX_PERIOD_SIZE,
290         .periods_min =          USE_PERIODS_MIN,
291         .periods_max =          USE_PERIODS_MAX,
292         .fifo_size =            0,
293 };
294
295 static struct snd_pcm_hardware snd_card_dummy_capture =
296 {
297         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
298                                  SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_MMAP_VALID),
299         .formats =              USE_FORMATS,
300         .rates =                USE_RATE,
301         .rate_min =             USE_RATE_MIN,
302         .rate_max =             USE_RATE_MAX,
303         .channels_min =         USE_CHANNELS_MIN,
304         .channels_max =         USE_CHANNELS_MAX,
305         .buffer_bytes_max =     MAX_BUFFER_SIZE,
306         .period_bytes_min =     64,
307         .period_bytes_max =     MAX_PERIOD_SIZE,
308         .periods_min =          USE_PERIODS_MIN,
309         .periods_max =          USE_PERIODS_MAX,
310         .fifo_size =            0,
311 };
312
313 static void snd_card_dummy_runtime_free(struct snd_pcm_runtime *runtime)
314 {
315         kfree(runtime->private_data);
316 }
317
318 static int snd_card_dummy_hw_params(struct snd_pcm_substream *substream,
319                                     struct snd_pcm_hw_params *hw_params)
320 {
321         return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
322 }
323
324 static int snd_card_dummy_hw_free(struct snd_pcm_substream *substream)
325 {
326         return snd_pcm_lib_free_pages(substream);
327 }
328
329 static struct snd_dummy_pcm *new_pcm_stream(struct snd_pcm_substream *substream)
330 {
331         struct snd_dummy_pcm *dpcm;
332
333         dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
334         if (! dpcm)
335                 return dpcm;
336         init_timer(&dpcm->timer);
337         dpcm->timer.data = (unsigned long) dpcm;
338         dpcm->timer.function = snd_card_dummy_pcm_timer_function;
339         spin_lock_init(&dpcm->lock);
340         dpcm->substream = substream;
341         return dpcm;
342 }
343
344 static int snd_card_dummy_playback_open(struct snd_pcm_substream *substream)
345 {
346         struct snd_pcm_runtime *runtime = substream->runtime;
347         struct snd_dummy_pcm *dpcm;
348         int err;
349
350         if ((dpcm = new_pcm_stream(substream)) == NULL)
351                 return -ENOMEM;
352         runtime->private_data = dpcm;
353         runtime->private_free = snd_card_dummy_runtime_free;
354         runtime->hw = snd_card_dummy_playback;
355         if (substream->pcm->device & 1) {
356                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
357                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
358         }
359         if (substream->pcm->device & 2)
360                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID);
361         if ((err = add_playback_constraints(runtime)) < 0) {
362                 kfree(dpcm);
363                 return err;
364         }
365
366         return 0;
367 }
368
369 static int snd_card_dummy_capture_open(struct snd_pcm_substream *substream)
370 {
371         struct snd_pcm_runtime *runtime = substream->runtime;
372         struct snd_dummy_pcm *dpcm;
373         int err;
374
375         if ((dpcm = new_pcm_stream(substream)) == NULL)
376                 return -ENOMEM;
377         runtime->private_data = dpcm;
378         runtime->private_free = snd_card_dummy_runtime_free;
379         runtime->hw = snd_card_dummy_capture;
380         if (substream->pcm->device == 1) {
381                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
382                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
383         }
384         if (substream->pcm->device & 2)
385                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID);
386         if ((err = add_capture_constraints(runtime)) < 0) {
387                 kfree(dpcm);
388                 return err;
389         }
390
391         return 0;
392 }
393
394 static int snd_card_dummy_playback_close(struct snd_pcm_substream *substream)
395 {
396         return 0;
397 }
398
399 static int snd_card_dummy_capture_close(struct snd_pcm_substream *substream)
400 {
401         return 0;
402 }
403
404 static struct snd_pcm_ops snd_card_dummy_playback_ops = {
405         .open =                 snd_card_dummy_playback_open,
406         .close =                snd_card_dummy_playback_close,
407         .ioctl =                snd_pcm_lib_ioctl,
408         .hw_params =            snd_card_dummy_hw_params,
409         .hw_free =              snd_card_dummy_hw_free,
410         .prepare =              snd_card_dummy_pcm_prepare,
411         .trigger =              snd_card_dummy_pcm_trigger,
412         .pointer =              snd_card_dummy_pcm_pointer,
413 };
414
415 static struct snd_pcm_ops snd_card_dummy_capture_ops = {
416         .open =                 snd_card_dummy_capture_open,
417         .close =                snd_card_dummy_capture_close,
418         .ioctl =                snd_pcm_lib_ioctl,
419         .hw_params =            snd_card_dummy_hw_params,
420         .hw_free =              snd_card_dummy_hw_free,
421         .prepare =              snd_card_dummy_pcm_prepare,
422         .trigger =              snd_card_dummy_pcm_trigger,
423         .pointer =              snd_card_dummy_pcm_pointer,
424 };
425
426 static int __devinit snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
427                                         int substreams)
428 {
429         struct snd_pcm *pcm;
430         int err;
431
432         if ((err = snd_pcm_new(dummy->card, "Dummy PCM", device,
433                                substreams, substreams, &pcm)) < 0)
434                 return err;
435         dummy->pcm = pcm;
436         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_card_dummy_playback_ops);
437         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_card_dummy_capture_ops);
438         pcm->private_data = dummy;
439         pcm->info_flags = 0;
440         strcpy(pcm->name, "Dummy PCM");
441         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
442                                               snd_dma_continuous_data(GFP_KERNEL),
443                                               0, 64*1024);
444         return 0;
445 }
446
447 #define DUMMY_VOLUME(xname, xindex, addr) \
448 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
449   .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
450   .name = xname, .index = xindex, \
451   .info = snd_dummy_volume_info, \
452   .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
453   .private_value = addr, \
454   .tlv = { .p = db_scale_dummy } }
455
456 static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
457                                  struct snd_ctl_elem_info *uinfo)
458 {
459         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
460         uinfo->count = 2;
461         uinfo->value.integer.min = -50;
462         uinfo->value.integer.max = 100;
463         return 0;
464 }
465  
466 static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
467                                 struct snd_ctl_elem_value *ucontrol)
468 {
469         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
470         int addr = kcontrol->private_value;
471
472         spin_lock_irq(&dummy->mixer_lock);
473         ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
474         ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
475         spin_unlock_irq(&dummy->mixer_lock);
476         return 0;
477 }
478
479 static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
480                                 struct snd_ctl_elem_value *ucontrol)
481 {
482         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
483         int change, addr = kcontrol->private_value;
484         int left, right;
485
486         left = ucontrol->value.integer.value[0];
487         if (left < -50)
488                 left = -50;
489         if (left > 100)
490                 left = 100;
491         right = ucontrol->value.integer.value[1];
492         if (right < -50)
493                 right = -50;
494         if (right > 100)
495                 right = 100;
496         spin_lock_irq(&dummy->mixer_lock);
497         change = dummy->mixer_volume[addr][0] != left ||
498                  dummy->mixer_volume[addr][1] != right;
499         dummy->mixer_volume[addr][0] = left;
500         dummy->mixer_volume[addr][1] = right;
501         spin_unlock_irq(&dummy->mixer_lock);
502         return change;
503 }
504
505 static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0);
506
507 #define DUMMY_CAPSRC(xname, xindex, addr) \
508 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
509   .info = snd_dummy_capsrc_info, \
510   .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
511   .private_value = addr }
512
513 #define snd_dummy_capsrc_info   snd_ctl_boolean_stereo_info
514  
515 static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
516                                 struct snd_ctl_elem_value *ucontrol)
517 {
518         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
519         int addr = kcontrol->private_value;
520
521         spin_lock_irq(&dummy->mixer_lock);
522         ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
523         ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
524         spin_unlock_irq(&dummy->mixer_lock);
525         return 0;
526 }
527
528 static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
529 {
530         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
531         int change, addr = kcontrol->private_value;
532         int left, right;
533
534         left = ucontrol->value.integer.value[0] & 1;
535         right = ucontrol->value.integer.value[1] & 1;
536         spin_lock_irq(&dummy->mixer_lock);
537         change = dummy->capture_source[addr][0] != left &&
538                  dummy->capture_source[addr][1] != right;
539         dummy->capture_source[addr][0] = left;
540         dummy->capture_source[addr][1] = right;
541         spin_unlock_irq(&dummy->mixer_lock);
542         return change;
543 }
544
545 static struct snd_kcontrol_new snd_dummy_controls[] = {
546 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
547 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
548 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
549 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH),
550 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
551 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE),
552 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
553 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC),
554 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
555 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD)
556 };
557
558 static int __devinit snd_card_dummy_new_mixer(struct snd_dummy *dummy)
559 {
560         struct snd_card *card = dummy->card;
561         unsigned int idx;
562         int err;
563
564         snd_assert(dummy != NULL, return -EINVAL);
565         spin_lock_init(&dummy->mixer_lock);
566         strcpy(card->mixername, "Dummy Mixer");
567
568         for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
569                 if ((err = snd_ctl_add(card, snd_ctl_new1(&snd_dummy_controls[idx], dummy))) < 0)
570                         return err;
571         }
572         return 0;
573 }
574
575 static int __devinit snd_dummy_probe(struct platform_device *devptr)
576 {
577         struct snd_card *card;
578         struct snd_dummy *dummy;
579         int idx, err;
580         int dev = devptr->id;
581
582         card = snd_card_new(index[dev], id[dev], THIS_MODULE,
583                             sizeof(struct snd_dummy));
584         if (card == NULL)
585                 return -ENOMEM;
586         dummy = card->private_data;
587         dummy->card = card;
588         for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
589                 if (pcm_substreams[dev] < 1)
590                         pcm_substreams[dev] = 1;
591                 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
592                         pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
593                 if ((err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev])) < 0)
594                         goto __nodev;
595         }
596         if ((err = snd_card_dummy_new_mixer(dummy)) < 0)
597                 goto __nodev;
598         strcpy(card->driver, "Dummy");
599         strcpy(card->shortname, "Dummy");
600         sprintf(card->longname, "Dummy %i", dev + 1);
601
602         snd_card_set_dev(card, &devptr->dev);
603
604         if ((err = snd_card_register(card)) == 0) {
605                 platform_set_drvdata(devptr, card);
606                 return 0;
607         }
608       __nodev:
609         snd_card_free(card);
610         return err;
611 }
612
613 static int __devexit snd_dummy_remove(struct platform_device *devptr)
614 {
615         snd_card_free(platform_get_drvdata(devptr));
616         platform_set_drvdata(devptr, NULL);
617         return 0;
618 }
619
620 #ifdef CONFIG_PM
621 static int snd_dummy_suspend(struct platform_device *pdev, pm_message_t state)
622 {
623         struct snd_card *card = platform_get_drvdata(pdev);
624         struct snd_dummy *dummy = card->private_data;
625
626         snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
627         snd_pcm_suspend_all(dummy->pcm);
628         return 0;
629 }
630         
631 static int snd_dummy_resume(struct platform_device *pdev)
632 {
633         struct snd_card *card = platform_get_drvdata(pdev);
634
635         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
636         return 0;
637 }
638 #endif
639
640 #define SND_DUMMY_DRIVER        "snd_dummy"
641
642 static struct platform_driver snd_dummy_driver = {
643         .probe          = snd_dummy_probe,
644         .remove         = __devexit_p(snd_dummy_remove),
645 #ifdef CONFIG_PM
646         .suspend        = snd_dummy_suspend,
647         .resume         = snd_dummy_resume,
648 #endif
649         .driver         = {
650                 .name   = SND_DUMMY_DRIVER
651         },
652 };
653
654 static void snd_dummy_unregister_all(void)
655 {
656         int i;
657
658         for (i = 0; i < ARRAY_SIZE(devices); ++i)
659                 platform_device_unregister(devices[i]);
660         platform_driver_unregister(&snd_dummy_driver);
661 }
662
663 static int __init alsa_card_dummy_init(void)
664 {
665         int i, cards, err;
666
667         if ((err = platform_driver_register(&snd_dummy_driver)) < 0)
668                 return err;
669
670         cards = 0;
671         for (i = 0; i < SNDRV_CARDS; i++) {
672                 struct platform_device *device;
673                 if (! enable[i])
674                         continue;
675                 device = platform_device_register_simple(SND_DUMMY_DRIVER,
676                                                          i, NULL, 0);
677                 if (IS_ERR(device))
678                         continue;
679                 if (!platform_get_drvdata(device)) {
680                         platform_device_unregister(device);
681                         continue;
682                 }
683                 devices[i] = device;
684                 cards++;
685         }
686         if (!cards) {
687 #ifdef MODULE
688                 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
689 #endif
690                 snd_dummy_unregister_all();
691                 return -ENODEV;
692         }
693         return 0;
694 }
695
696 static void __exit alsa_card_dummy_exit(void)
697 {
698         snd_dummy_unregister_all();
699 }
700
701 module_init(alsa_card_dummy_init)
702 module_exit(alsa_card_dummy_exit)