time: move PIT_TICK_RATE to linux/timex.h
[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 <linux/init.h>
22 #include <linux/err.h>
23 #include <linux/platform_device.h>
24 #include <linux/jiffies.h>
25 #include <linux/slab.h>
26 #include <linux/time.h>
27 #include <linux/wait.h>
28 #include <linux/moduleparam.h>
29 #include <sound/core.h>
30 #include <sound/control.h>
31 #include <sound/tlv.h>
32 #include <sound/pcm.h>
33 #include <sound/rawmidi.h>
34 #include <sound/initval.h>
35
36 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
37 MODULE_DESCRIPTION("Dummy soundcard (/dev/null)");
38 MODULE_LICENSE("GPL");
39 MODULE_SUPPORTED_DEVICE("{{ALSA,Dummy soundcard}}");
40
41 #define MAX_PCM_DEVICES         4
42 #define MAX_PCM_SUBSTREAMS      16
43 #define MAX_MIDI_DEVICES        2
44
45 #if 0 /* emu10k1 emulation */
46 #define MAX_BUFFER_SIZE         (128 * 1024)
47 static int emu10k1_playback_constraints(struct snd_pcm_runtime *runtime)
48 {
49         int err;
50         err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
51         if (err < 0)
52                 return err;
53         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256, UINT_MAX);
54         if (err < 0)
55                 return err;
56         return 0;
57 }
58 #define add_playback_constraints emu10k1_playback_constraints
59 #endif
60
61 #if 0 /* RME9652 emulation */
62 #define MAX_BUFFER_SIZE         (26 * 64 * 1024)
63 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S32_LE
64 #define USE_CHANNELS_MIN        26
65 #define USE_CHANNELS_MAX        26
66 #define USE_PERIODS_MIN         2
67 #define USE_PERIODS_MAX         2
68 #endif
69
70 #if 0 /* ICE1712 emulation */
71 #define MAX_BUFFER_SIZE         (256 * 1024)
72 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S32_LE
73 #define USE_CHANNELS_MIN        10
74 #define USE_CHANNELS_MAX        10
75 #define USE_PERIODS_MIN         1
76 #define USE_PERIODS_MAX         1024
77 #endif
78
79 #if 0 /* UDA1341 emulation */
80 #define MAX_BUFFER_SIZE         (16380)
81 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S16_LE
82 #define USE_CHANNELS_MIN        2
83 #define USE_CHANNELS_MAX        2
84 #define USE_PERIODS_MIN         2
85 #define USE_PERIODS_MAX         255
86 #endif
87
88 #if 0 /* simple AC97 bridge (intel8x0) with 48kHz AC97 only codec */
89 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S16_LE
90 #define USE_CHANNELS_MIN        2
91 #define USE_CHANNELS_MAX        2
92 #define USE_RATE                SNDRV_PCM_RATE_48000
93 #define USE_RATE_MIN            48000
94 #define USE_RATE_MAX            48000
95 #endif
96
97 #if 0 /* CA0106 */
98 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S16_LE
99 #define USE_CHANNELS_MIN        2
100 #define USE_CHANNELS_MAX        2
101 #define USE_RATE                (SNDRV_PCM_RATE_48000|SNDRV_PCM_RATE_96000|SNDRV_PCM_RATE_192000) 
102 #define USE_RATE_MIN            48000 
103 #define USE_RATE_MAX            192000
104 #define MAX_BUFFER_SIZE         ((65536-64)*8)
105 #define MAX_PERIOD_SIZE         (65536-64)
106 #define USE_PERIODS_MIN         2
107 #define USE_PERIODS_MAX         8
108 #endif
109
110
111 /* defaults */
112 #ifndef MAX_BUFFER_SIZE
113 #define MAX_BUFFER_SIZE         (64*1024)
114 #endif
115 #ifndef MAX_PERIOD_SIZE
116 #define MAX_PERIOD_SIZE         MAX_BUFFER_SIZE
117 #endif
118 #ifndef USE_FORMATS
119 #define USE_FORMATS             (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE)
120 #endif
121 #ifndef USE_RATE
122 #define USE_RATE                SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000
123 #define USE_RATE_MIN            5500
124 #define USE_RATE_MAX            48000
125 #endif
126 #ifndef USE_CHANNELS_MIN
127 #define USE_CHANNELS_MIN        1
128 #endif
129 #ifndef USE_CHANNELS_MAX
130 #define USE_CHANNELS_MAX        2
131 #endif
132 #ifndef USE_PERIODS_MIN
133 #define USE_PERIODS_MIN         1
134 #endif
135 #ifndef USE_PERIODS_MAX
136 #define USE_PERIODS_MAX         1024
137 #endif
138 #ifndef add_playback_constraints
139 #define add_playback_constraints(x) 0
140 #endif
141 #ifndef add_capture_constraints
142 #define add_capture_constraints(x) 0
143 #endif
144
145 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
146 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
147 static int enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
148 static int pcm_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
149 static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8};
150 //static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 2};
151
152 module_param_array(index, int, NULL, 0444);
153 MODULE_PARM_DESC(index, "Index value for dummy soundcard.");
154 module_param_array(id, charp, NULL, 0444);
155 MODULE_PARM_DESC(id, "ID string for dummy soundcard.");
156 module_param_array(enable, bool, NULL, 0444);
157 MODULE_PARM_DESC(enable, "Enable this dummy soundcard.");
158 module_param_array(pcm_devs, int, NULL, 0444);
159 MODULE_PARM_DESC(pcm_devs, "PCM devices # (0-4) for dummy driver.");
160 module_param_array(pcm_substreams, int, NULL, 0444);
161 MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-16) for dummy driver.");
162 //module_param_array(midi_devs, int, NULL, 0444);
163 //MODULE_PARM_DESC(midi_devs, "MIDI devices # (0-2) for dummy driver.");
164
165 static struct platform_device *devices[SNDRV_CARDS];
166
167 #define MIXER_ADDR_MASTER       0
168 #define MIXER_ADDR_LINE         1
169 #define MIXER_ADDR_MIC          2
170 #define MIXER_ADDR_SYNTH        3
171 #define MIXER_ADDR_CD           4
172 #define MIXER_ADDR_LAST         4
173
174 struct snd_dummy {
175         struct snd_card *card;
176         struct snd_pcm *pcm;
177         spinlock_t mixer_lock;
178         int mixer_volume[MIXER_ADDR_LAST+1][2];
179         int capture_source[MIXER_ADDR_LAST+1][2];
180 };
181
182 struct snd_dummy_pcm {
183         struct snd_dummy *dummy;
184         spinlock_t lock;
185         struct timer_list timer;
186         unsigned int pcm_buffer_size;
187         unsigned int pcm_period_size;
188         unsigned int pcm_bps;           /* bytes per second */
189         unsigned int pcm_hz;            /* HZ */
190         unsigned int pcm_irq_pos;       /* IRQ position */
191         unsigned int pcm_buf_pos;       /* position in buffer */
192         struct snd_pcm_substream *substream;
193 };
194
195
196 static inline void snd_card_dummy_pcm_timer_start(struct snd_dummy_pcm *dpcm)
197 {
198         dpcm->timer.expires = 1 + jiffies;
199         add_timer(&dpcm->timer);
200 }
201
202 static inline void snd_card_dummy_pcm_timer_stop(struct snd_dummy_pcm *dpcm)
203 {
204         del_timer(&dpcm->timer);
205 }
206
207 static int snd_card_dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
208 {
209         struct snd_pcm_runtime *runtime = substream->runtime;
210         struct snd_dummy_pcm *dpcm = runtime->private_data;
211         int err = 0;
212
213         spin_lock(&dpcm->lock);
214         switch (cmd) {
215         case SNDRV_PCM_TRIGGER_START:
216         case SNDRV_PCM_TRIGGER_RESUME:
217                 snd_card_dummy_pcm_timer_start(dpcm);
218                 break;
219         case SNDRV_PCM_TRIGGER_STOP:
220         case SNDRV_PCM_TRIGGER_SUSPEND:
221                 snd_card_dummy_pcm_timer_stop(dpcm);
222                 break;
223         default:
224                 err = -EINVAL;
225                 break;
226         }
227         spin_unlock(&dpcm->lock);
228         return 0;
229 }
230
231 static int snd_card_dummy_pcm_prepare(struct snd_pcm_substream *substream)
232 {
233         struct snd_pcm_runtime *runtime = substream->runtime;
234         struct snd_dummy_pcm *dpcm = runtime->private_data;
235         int bps;
236
237         bps = snd_pcm_format_width(runtime->format) * runtime->rate *
238                 runtime->channels / 8;
239
240         if (bps <= 0)
241                 return -EINVAL;
242
243         dpcm->pcm_bps = bps;
244         dpcm->pcm_hz = HZ;
245         dpcm->pcm_buffer_size = snd_pcm_lib_buffer_bytes(substream);
246         dpcm->pcm_period_size = snd_pcm_lib_period_bytes(substream);
247         dpcm->pcm_irq_pos = 0;
248         dpcm->pcm_buf_pos = 0;
249
250         snd_pcm_format_set_silence(runtime->format, runtime->dma_area,
251                         bytes_to_samples(runtime, runtime->dma_bytes));
252
253         return 0;
254 }
255
256 static void snd_card_dummy_pcm_timer_function(unsigned long data)
257 {
258         struct snd_dummy_pcm *dpcm = (struct snd_dummy_pcm *)data;
259         unsigned long flags;
260         
261         spin_lock_irqsave(&dpcm->lock, flags);
262         dpcm->timer.expires = 1 + jiffies;
263         add_timer(&dpcm->timer);
264         dpcm->pcm_irq_pos += dpcm->pcm_bps;
265         dpcm->pcm_buf_pos += dpcm->pcm_bps;
266         dpcm->pcm_buf_pos %= dpcm->pcm_buffer_size * dpcm->pcm_hz;
267         if (dpcm->pcm_irq_pos >= dpcm->pcm_period_size * dpcm->pcm_hz) {
268                 dpcm->pcm_irq_pos %= dpcm->pcm_period_size * dpcm->pcm_hz;
269                 spin_unlock_irqrestore(&dpcm->lock, flags);
270                 snd_pcm_period_elapsed(dpcm->substream);
271         } else
272                 spin_unlock_irqrestore(&dpcm->lock, flags);
273 }
274
275 static snd_pcm_uframes_t snd_card_dummy_pcm_pointer(struct snd_pcm_substream *substream)
276 {
277         struct snd_pcm_runtime *runtime = substream->runtime;
278         struct snd_dummy_pcm *dpcm = runtime->private_data;
279
280         return bytes_to_frames(runtime, dpcm->pcm_buf_pos / dpcm->pcm_hz);
281 }
282
283 static struct snd_pcm_hardware snd_card_dummy_playback =
284 {
285         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
286                                  SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_MMAP_VALID),
287         .formats =              USE_FORMATS,
288         .rates =                USE_RATE,
289         .rate_min =             USE_RATE_MIN,
290         .rate_max =             USE_RATE_MAX,
291         .channels_min =         USE_CHANNELS_MIN,
292         .channels_max =         USE_CHANNELS_MAX,
293         .buffer_bytes_max =     MAX_BUFFER_SIZE,
294         .period_bytes_min =     64,
295         .period_bytes_max =     MAX_PERIOD_SIZE,
296         .periods_min =          USE_PERIODS_MIN,
297         .periods_max =          USE_PERIODS_MAX,
298         .fifo_size =            0,
299 };
300
301 static struct snd_pcm_hardware snd_card_dummy_capture =
302 {
303         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
304                                  SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_MMAP_VALID),
305         .formats =              USE_FORMATS,
306         .rates =                USE_RATE,
307         .rate_min =             USE_RATE_MIN,
308         .rate_max =             USE_RATE_MAX,
309         .channels_min =         USE_CHANNELS_MIN,
310         .channels_max =         USE_CHANNELS_MAX,
311         .buffer_bytes_max =     MAX_BUFFER_SIZE,
312         .period_bytes_min =     64,
313         .period_bytes_max =     MAX_PERIOD_SIZE,
314         .periods_min =          USE_PERIODS_MIN,
315         .periods_max =          USE_PERIODS_MAX,
316         .fifo_size =            0,
317 };
318
319 static void snd_card_dummy_runtime_free(struct snd_pcm_runtime *runtime)
320 {
321         kfree(runtime->private_data);
322 }
323
324 static int snd_card_dummy_hw_params(struct snd_pcm_substream *substream,
325                                     struct snd_pcm_hw_params *hw_params)
326 {
327         return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
328 }
329
330 static int snd_card_dummy_hw_free(struct snd_pcm_substream *substream)
331 {
332         return snd_pcm_lib_free_pages(substream);
333 }
334
335 static struct snd_dummy_pcm *new_pcm_stream(struct snd_pcm_substream *substream)
336 {
337         struct snd_dummy_pcm *dpcm;
338
339         dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
340         if (! dpcm)
341                 return dpcm;
342         init_timer(&dpcm->timer);
343         dpcm->timer.data = (unsigned long) dpcm;
344         dpcm->timer.function = snd_card_dummy_pcm_timer_function;
345         spin_lock_init(&dpcm->lock);
346         dpcm->substream = substream;
347         return dpcm;
348 }
349
350 static int snd_card_dummy_playback_open(struct snd_pcm_substream *substream)
351 {
352         struct snd_pcm_runtime *runtime = substream->runtime;
353         struct snd_dummy_pcm *dpcm;
354         int err;
355
356         if ((dpcm = new_pcm_stream(substream)) == NULL)
357                 return -ENOMEM;
358         runtime->private_data = dpcm;
359         /* makes the infrastructure responsible for freeing dpcm */
360         runtime->private_free = snd_card_dummy_runtime_free;
361         runtime->hw = snd_card_dummy_playback;
362         if (substream->pcm->device & 1) {
363                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
364                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
365         }
366         if (substream->pcm->device & 2)
367                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID);
368         err = add_playback_constraints(runtime);
369         if (err < 0)
370                 return err;
371
372         return 0;
373 }
374
375 static int snd_card_dummy_capture_open(struct snd_pcm_substream *substream)
376 {
377         struct snd_pcm_runtime *runtime = substream->runtime;
378         struct snd_dummy_pcm *dpcm;
379         int err;
380
381         if ((dpcm = new_pcm_stream(substream)) == NULL)
382                 return -ENOMEM;
383         runtime->private_data = dpcm;
384         /* makes the infrastructure responsible for freeing dpcm */
385         runtime->private_free = snd_card_dummy_runtime_free;
386         runtime->hw = snd_card_dummy_capture;
387         if (substream->pcm->device == 1) {
388                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
389                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
390         }
391         if (substream->pcm->device & 2)
392                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID);
393         err = add_capture_constraints(runtime);
394         if (err < 0)
395                 return err;
396
397         return 0;
398 }
399
400 static int snd_card_dummy_playback_close(struct snd_pcm_substream *substream)
401 {
402         return 0;
403 }
404
405 static int snd_card_dummy_capture_close(struct snd_pcm_substream *substream)
406 {
407         return 0;
408 }
409
410 static struct snd_pcm_ops snd_card_dummy_playback_ops = {
411         .open =                 snd_card_dummy_playback_open,
412         .close =                snd_card_dummy_playback_close,
413         .ioctl =                snd_pcm_lib_ioctl,
414         .hw_params =            snd_card_dummy_hw_params,
415         .hw_free =              snd_card_dummy_hw_free,
416         .prepare =              snd_card_dummy_pcm_prepare,
417         .trigger =              snd_card_dummy_pcm_trigger,
418         .pointer =              snd_card_dummy_pcm_pointer,
419 };
420
421 static struct snd_pcm_ops snd_card_dummy_capture_ops = {
422         .open =                 snd_card_dummy_capture_open,
423         .close =                snd_card_dummy_capture_close,
424         .ioctl =                snd_pcm_lib_ioctl,
425         .hw_params =            snd_card_dummy_hw_params,
426         .hw_free =              snd_card_dummy_hw_free,
427         .prepare =              snd_card_dummy_pcm_prepare,
428         .trigger =              snd_card_dummy_pcm_trigger,
429         .pointer =              snd_card_dummy_pcm_pointer,
430 };
431
432 static int __devinit snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
433                                         int substreams)
434 {
435         struct snd_pcm *pcm;
436         int err;
437
438         err = snd_pcm_new(dummy->card, "Dummy PCM", device,
439                                substreams, substreams, &pcm);
440         if (err < 0)
441                 return err;
442         dummy->pcm = pcm;
443         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_card_dummy_playback_ops);
444         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_card_dummy_capture_ops);
445         pcm->private_data = dummy;
446         pcm->info_flags = 0;
447         strcpy(pcm->name, "Dummy PCM");
448         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
449                                               snd_dma_continuous_data(GFP_KERNEL),
450                                               0, 64*1024);
451         return 0;
452 }
453
454 #define DUMMY_VOLUME(xname, xindex, addr) \
455 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
456   .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
457   .name = xname, .index = xindex, \
458   .info = snd_dummy_volume_info, \
459   .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
460   .private_value = addr, \
461   .tlv = { .p = db_scale_dummy } }
462
463 static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
464                                  struct snd_ctl_elem_info *uinfo)
465 {
466         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
467         uinfo->count = 2;
468         uinfo->value.integer.min = -50;
469         uinfo->value.integer.max = 100;
470         return 0;
471 }
472  
473 static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
474                                 struct snd_ctl_elem_value *ucontrol)
475 {
476         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
477         int addr = kcontrol->private_value;
478
479         spin_lock_irq(&dummy->mixer_lock);
480         ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
481         ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
482         spin_unlock_irq(&dummy->mixer_lock);
483         return 0;
484 }
485
486 static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
487                                 struct snd_ctl_elem_value *ucontrol)
488 {
489         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
490         int change, addr = kcontrol->private_value;
491         int left, right;
492
493         left = ucontrol->value.integer.value[0];
494         if (left < -50)
495                 left = -50;
496         if (left > 100)
497                 left = 100;
498         right = ucontrol->value.integer.value[1];
499         if (right < -50)
500                 right = -50;
501         if (right > 100)
502                 right = 100;
503         spin_lock_irq(&dummy->mixer_lock);
504         change = dummy->mixer_volume[addr][0] != left ||
505                  dummy->mixer_volume[addr][1] != right;
506         dummy->mixer_volume[addr][0] = left;
507         dummy->mixer_volume[addr][1] = right;
508         spin_unlock_irq(&dummy->mixer_lock);
509         return change;
510 }
511
512 static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0);
513
514 #define DUMMY_CAPSRC(xname, xindex, addr) \
515 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
516   .info = snd_dummy_capsrc_info, \
517   .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
518   .private_value = addr }
519
520 #define snd_dummy_capsrc_info   snd_ctl_boolean_stereo_info
521  
522 static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
523                                 struct snd_ctl_elem_value *ucontrol)
524 {
525         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
526         int addr = kcontrol->private_value;
527
528         spin_lock_irq(&dummy->mixer_lock);
529         ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
530         ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
531         spin_unlock_irq(&dummy->mixer_lock);
532         return 0;
533 }
534
535 static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
536 {
537         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
538         int change, addr = kcontrol->private_value;
539         int left, right;
540
541         left = ucontrol->value.integer.value[0] & 1;
542         right = ucontrol->value.integer.value[1] & 1;
543         spin_lock_irq(&dummy->mixer_lock);
544         change = dummy->capture_source[addr][0] != left &&
545                  dummy->capture_source[addr][1] != right;
546         dummy->capture_source[addr][0] = left;
547         dummy->capture_source[addr][1] = right;
548         spin_unlock_irq(&dummy->mixer_lock);
549         return change;
550 }
551
552 static struct snd_kcontrol_new snd_dummy_controls[] = {
553 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
554 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
555 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
556 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH),
557 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
558 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE),
559 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
560 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC),
561 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
562 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD)
563 };
564
565 static int __devinit snd_card_dummy_new_mixer(struct snd_dummy *dummy)
566 {
567         struct snd_card *card = dummy->card;
568         unsigned int idx;
569         int err;
570
571         if (snd_BUG_ON(!dummy))
572                 return -EINVAL;
573         spin_lock_init(&dummy->mixer_lock);
574         strcpy(card->mixername, "Dummy Mixer");
575
576         for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
577                 err = snd_ctl_add(card, snd_ctl_new1(&snd_dummy_controls[idx], dummy));
578                 if (err < 0)
579                         return err;
580         }
581         return 0;
582 }
583
584 static int __devinit snd_dummy_probe(struct platform_device *devptr)
585 {
586         struct snd_card *card;
587         struct snd_dummy *dummy;
588         int idx, err;
589         int dev = devptr->id;
590
591         err = snd_card_create(index[dev], id[dev], THIS_MODULE,
592                               sizeof(struct snd_dummy), &card);
593         if (err < 0)
594                 return err;
595         dummy = card->private_data;
596         dummy->card = card;
597         for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
598                 if (pcm_substreams[dev] < 1)
599                         pcm_substreams[dev] = 1;
600                 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
601                         pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
602                 err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev]);
603                 if (err < 0)
604                         goto __nodev;
605         }
606         err = snd_card_dummy_new_mixer(dummy);
607         if (err < 0)
608                 goto __nodev;
609         strcpy(card->driver, "Dummy");
610         strcpy(card->shortname, "Dummy");
611         sprintf(card->longname, "Dummy %i", dev + 1);
612
613         snd_card_set_dev(card, &devptr->dev);
614
615         err = snd_card_register(card);
616         if (err == 0) {
617                 platform_set_drvdata(devptr, card);
618                 return 0;
619         }
620       __nodev:
621         snd_card_free(card);
622         return err;
623 }
624
625 static int __devexit snd_dummy_remove(struct platform_device *devptr)
626 {
627         snd_card_free(platform_get_drvdata(devptr));
628         platform_set_drvdata(devptr, NULL);
629         return 0;
630 }
631
632 #ifdef CONFIG_PM
633 static int snd_dummy_suspend(struct platform_device *pdev, pm_message_t state)
634 {
635         struct snd_card *card = platform_get_drvdata(pdev);
636         struct snd_dummy *dummy = card->private_data;
637
638         snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
639         snd_pcm_suspend_all(dummy->pcm);
640         return 0;
641 }
642         
643 static int snd_dummy_resume(struct platform_device *pdev)
644 {
645         struct snd_card *card = platform_get_drvdata(pdev);
646
647         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
648         return 0;
649 }
650 #endif
651
652 #define SND_DUMMY_DRIVER        "snd_dummy"
653
654 static struct platform_driver snd_dummy_driver = {
655         .probe          = snd_dummy_probe,
656         .remove         = __devexit_p(snd_dummy_remove),
657 #ifdef CONFIG_PM
658         .suspend        = snd_dummy_suspend,
659         .resume         = snd_dummy_resume,
660 #endif
661         .driver         = {
662                 .name   = SND_DUMMY_DRIVER
663         },
664 };
665
666 static void snd_dummy_unregister_all(void)
667 {
668         int i;
669
670         for (i = 0; i < ARRAY_SIZE(devices); ++i)
671                 platform_device_unregister(devices[i]);
672         platform_driver_unregister(&snd_dummy_driver);
673 }
674
675 static int __init alsa_card_dummy_init(void)
676 {
677         int i, cards, err;
678
679         err = platform_driver_register(&snd_dummy_driver);
680         if (err < 0)
681                 return err;
682
683         cards = 0;
684         for (i = 0; i < SNDRV_CARDS; i++) {
685                 struct platform_device *device;
686                 if (! enable[i])
687                         continue;
688                 device = platform_device_register_simple(SND_DUMMY_DRIVER,
689                                                          i, NULL, 0);
690                 if (IS_ERR(device))
691                         continue;
692                 if (!platform_get_drvdata(device)) {
693                         platform_device_unregister(device);
694                         continue;
695                 }
696                 devices[i] = device;
697                 cards++;
698         }
699         if (!cards) {
700 #ifdef MODULE
701                 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
702 #endif
703                 snd_dummy_unregister_all();
704                 return -ENODEV;
705         }
706         return 0;
707 }
708
709 static void __exit alsa_card_dummy_exit(void)
710 {
711         snd_dummy_unregister_all();
712 }
713
714 module_init(alsa_card_dummy_init)
715 module_exit(alsa_card_dummy_exit)