a276f7c80360cf82408af65f08200620854a0fba
[linux-2.6.git] / sound / drivers / dummy.c
1 /*
2  *  Dummy soundcard
3  *  Copyright (c) by Jaroslav Kysela <perex@suse.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/pcm.h>
33 #include <sound/rawmidi.h>
34 #include <sound/initval.h>
35
36 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.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         if ((err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
51                 return err;
52         if ((err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256, UINT_MAX)) < 0)
53                 return err;
54         return 0;
55 }
56 #define add_playback_constraints emu10k1_playback_constraints
57 #endif
58
59 #if 0 /* RME9652 emulation */
60 #define MAX_BUFFER_SIZE         (26 * 64 * 1024)
61 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S32_LE
62 #define USE_CHANNELS_MIN        26
63 #define USE_CHANNELS_MAX        26
64 #define USE_PERIODS_MIN         2
65 #define USE_PERIODS_MAX         2
66 #endif
67
68 #if 0 /* ICE1712 emulation */
69 #define MAX_BUFFER_SIZE         (256 * 1024)
70 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S32_LE
71 #define USE_CHANNELS_MIN        10
72 #define USE_CHANNELS_MAX        10
73 #define USE_PERIODS_MIN         1
74 #define USE_PERIODS_MAX         1024
75 #endif
76
77 #if 0 /* UDA1341 emulation */
78 #define MAX_BUFFER_SIZE         (16380)
79 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S16_LE
80 #define USE_CHANNELS_MIN        2
81 #define USE_CHANNELS_MAX        2
82 #define USE_PERIODS_MIN         2
83 #define USE_PERIODS_MAX         255
84 #endif
85
86 #if 0 /* simple AC97 bridge (intel8x0) with 48kHz AC97 only codec */
87 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S16_LE
88 #define USE_CHANNELS_MIN        2
89 #define USE_CHANNELS_MAX        2
90 #define USE_RATE                SNDRV_PCM_RATE_48000
91 #define USE_RATE_MIN            48000
92 #define USE_RATE_MAX            48000
93 #endif
94
95
96 /* defaults */
97 #ifndef MAX_BUFFER_SIZE
98 #define MAX_BUFFER_SIZE         (64*1024)
99 #endif
100 #ifndef USE_FORMATS
101 #define USE_FORMATS             (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE)
102 #endif
103 #ifndef USE_RATE
104 #define USE_RATE                SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000
105 #define USE_RATE_MIN            5500
106 #define USE_RATE_MAX            48000
107 #endif
108 #ifndef USE_CHANNELS_MIN
109 #define USE_CHANNELS_MIN        1
110 #endif
111 #ifndef USE_CHANNELS_MAX
112 #define USE_CHANNELS_MAX        2
113 #endif
114 #ifndef USE_PERIODS_MIN
115 #define USE_PERIODS_MIN         1
116 #endif
117 #ifndef USE_PERIODS_MAX
118 #define USE_PERIODS_MAX         1024
119 #endif
120 #ifndef add_playback_constraints
121 #define add_playback_constraints(x) 0
122 #endif
123 #ifndef add_capture_constraints
124 #define add_capture_constraints(x) 0
125 #endif
126
127 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
128 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
129 static int enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
130 static int pcm_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
131 static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8};
132 //static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 2};
133
134 module_param_array(index, int, NULL, 0444);
135 MODULE_PARM_DESC(index, "Index value for dummy soundcard.");
136 module_param_array(id, charp, NULL, 0444);
137 MODULE_PARM_DESC(id, "ID string for dummy soundcard.");
138 module_param_array(enable, bool, NULL, 0444);
139 MODULE_PARM_DESC(enable, "Enable this dummy soundcard.");
140 module_param_array(pcm_devs, int, NULL, 0444);
141 MODULE_PARM_DESC(pcm_devs, "PCM devices # (0-4) for dummy driver.");
142 module_param_array(pcm_substreams, int, NULL, 0444);
143 MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-16) for dummy driver.");
144 //module_param_array(midi_devs, int, NULL, 0444);
145 //MODULE_PARM_DESC(midi_devs, "MIDI devices # (0-2) for dummy driver.");
146
147 #define MIXER_ADDR_MASTER       0
148 #define MIXER_ADDR_LINE         1
149 #define MIXER_ADDR_MIC          2
150 #define MIXER_ADDR_SYNTH        3
151 #define MIXER_ADDR_CD           4
152 #define MIXER_ADDR_LAST         4
153
154 struct snd_dummy {
155         struct snd_card *card;
156         struct snd_pcm *pcm;
157         spinlock_t mixer_lock;
158         int mixer_volume[MIXER_ADDR_LAST+1][2];
159         int capture_source[MIXER_ADDR_LAST+1][2];
160 };
161
162 struct snd_dummy_pcm {
163         struct snd_dummy *dummy;
164         spinlock_t lock;
165         struct timer_list timer;
166         unsigned int pcm_size;
167         unsigned int pcm_count;
168         unsigned int pcm_bps;           /* bytes per second */
169         unsigned int pcm_jiffie;        /* bytes per one jiffie */
170         unsigned int pcm_irq_pos;       /* IRQ position */
171         unsigned int pcm_buf_pos;       /* position in buffer */
172         struct snd_pcm_substream *substream;
173 };
174
175
176 static inline void snd_card_dummy_pcm_timer_start(struct snd_dummy_pcm *dpcm)
177 {
178         dpcm->timer.expires = 1 + jiffies;
179         add_timer(&dpcm->timer);
180 }
181
182 static inline void snd_card_dummy_pcm_timer_stop(struct snd_dummy_pcm *dpcm)
183 {
184         del_timer(&dpcm->timer);
185 }
186
187 static int snd_card_dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
188 {
189         struct snd_pcm_runtime *runtime = substream->runtime;
190         struct snd_dummy_pcm *dpcm = runtime->private_data;
191         int err = 0;
192
193         spin_lock(&dpcm->lock);
194         switch (cmd) {
195         case SNDRV_PCM_TRIGGER_START:
196         case SNDRV_PCM_TRIGGER_RESUME:
197                 snd_card_dummy_pcm_timer_start(dpcm);
198                 break;
199         case SNDRV_PCM_TRIGGER_STOP:
200         case SNDRV_PCM_TRIGGER_SUSPEND:
201                 snd_card_dummy_pcm_timer_stop(dpcm);
202                 break;
203         default:
204                 err = -EINVAL;
205                 break;
206         }
207         spin_unlock(&dpcm->lock);
208         return 0;
209 }
210
211 static int snd_card_dummy_pcm_prepare(struct snd_pcm_substream *substream)
212 {
213         struct snd_pcm_runtime *runtime = substream->runtime;
214         struct snd_dummy_pcm *dpcm = runtime->private_data;
215         unsigned int bps;
216
217         bps = runtime->rate * runtime->channels;
218         bps *= snd_pcm_format_width(runtime->format);
219         bps /= 8;
220         if (bps <= 0)
221                 return -EINVAL;
222         dpcm->pcm_bps = bps;
223         dpcm->pcm_jiffie = bps / HZ;
224         dpcm->pcm_size = snd_pcm_lib_buffer_bytes(substream);
225         dpcm->pcm_count = snd_pcm_lib_period_bytes(substream);
226         dpcm->pcm_irq_pos = 0;
227         dpcm->pcm_buf_pos = 0;
228         return 0;
229 }
230
231 static void snd_card_dummy_pcm_timer_function(unsigned long data)
232 {
233         struct snd_dummy_pcm *dpcm = (struct snd_dummy_pcm *)data;
234         
235         spin_lock(&dpcm->lock);
236         dpcm->timer.expires = 1 + jiffies;
237         add_timer(&dpcm->timer);
238         dpcm->pcm_irq_pos += dpcm->pcm_jiffie;
239         dpcm->pcm_buf_pos += dpcm->pcm_jiffie;
240         dpcm->pcm_buf_pos %= dpcm->pcm_size;
241         if (dpcm->pcm_irq_pos >= dpcm->pcm_count) {
242                 dpcm->pcm_irq_pos %= dpcm->pcm_count;
243                 spin_unlock(&dpcm->lock);
244                 snd_pcm_period_elapsed(dpcm->substream);
245                 spin_lock(&dpcm->lock);
246         }
247         spin_unlock(&dpcm->lock);
248 }
249
250 static snd_pcm_uframes_t snd_card_dummy_pcm_pointer(struct snd_pcm_substream *substream)
251 {
252         struct snd_pcm_runtime *runtime = substream->runtime;
253         struct snd_dummy_pcm *dpcm = runtime->private_data;
254
255         return bytes_to_frames(runtime, dpcm->pcm_buf_pos);
256 }
257
258 static struct snd_pcm_hardware snd_card_dummy_playback =
259 {
260         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
261                                  SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_MMAP_VALID),
262         .formats =              USE_FORMATS,
263         .rates =                USE_RATE,
264         .rate_min =             USE_RATE_MIN,
265         .rate_max =             USE_RATE_MAX,
266         .channels_min =         USE_CHANNELS_MIN,
267         .channels_max =         USE_CHANNELS_MAX,
268         .buffer_bytes_max =     MAX_BUFFER_SIZE,
269         .period_bytes_min =     64,
270         .period_bytes_max =     MAX_BUFFER_SIZE,
271         .periods_min =          USE_PERIODS_MIN,
272         .periods_max =          USE_PERIODS_MAX,
273         .fifo_size =            0,
274 };
275
276 static struct snd_pcm_hardware snd_card_dummy_capture =
277 {
278         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
279                                  SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_MMAP_VALID),
280         .formats =              USE_FORMATS,
281         .rates =                USE_RATE,
282         .rate_min =             USE_RATE_MIN,
283         .rate_max =             USE_RATE_MAX,
284         .channels_min =         USE_CHANNELS_MIN,
285         .channels_max =         USE_CHANNELS_MAX,
286         .buffer_bytes_max =     MAX_BUFFER_SIZE,
287         .period_bytes_min =     64,
288         .period_bytes_max =     MAX_BUFFER_SIZE,
289         .periods_min =          USE_PERIODS_MIN,
290         .periods_max =          USE_PERIODS_MAX,
291         .fifo_size =            0,
292 };
293
294 static void snd_card_dummy_runtime_free(struct snd_pcm_runtime *runtime)
295 {
296         kfree(runtime->private_data);
297 }
298
299 static int snd_card_dummy_hw_params(struct snd_pcm_substream *substream,
300                                     struct snd_pcm_hw_params *hw_params)
301 {
302         return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
303 }
304
305 static int snd_card_dummy_hw_free(struct snd_pcm_substream *substream)
306 {
307         return snd_pcm_lib_free_pages(substream);
308 }
309
310 static struct snd_dummy_pcm *new_pcm_stream(struct snd_pcm_substream *substream)
311 {
312         struct snd_dummy_pcm *dpcm;
313
314         dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
315         if (! dpcm)
316                 return dpcm;
317         init_timer(&dpcm->timer);
318         dpcm->timer.data = (unsigned long) dpcm;
319         dpcm->timer.function = snd_card_dummy_pcm_timer_function;
320         spin_lock_init(&dpcm->lock);
321         dpcm->substream = substream;
322         return dpcm;
323 }
324
325 static int snd_card_dummy_playback_open(struct snd_pcm_substream *substream)
326 {
327         struct snd_pcm_runtime *runtime = substream->runtime;
328         struct snd_dummy_pcm *dpcm;
329         int err;
330
331         if ((dpcm = new_pcm_stream(substream)) == NULL)
332                 return -ENOMEM;
333         runtime->private_data = dpcm;
334         runtime->private_free = snd_card_dummy_runtime_free;
335         runtime->hw = snd_card_dummy_playback;
336         if (substream->pcm->device & 1) {
337                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
338                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
339         }
340         if (substream->pcm->device & 2)
341                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID);
342         if ((err = add_playback_constraints(runtime)) < 0) {
343                 kfree(dpcm);
344                 return err;
345         }
346
347         return 0;
348 }
349
350 static int snd_card_dummy_capture_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         runtime->private_free = snd_card_dummy_runtime_free;
360         runtime->hw = snd_card_dummy_capture;
361         if (substream->pcm->device == 1) {
362                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
363                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
364         }
365         if (substream->pcm->device & 2)
366                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID);
367         if ((err = add_capture_constraints(runtime)) < 0) {
368                 kfree(dpcm);
369                 return err;
370         }
371
372         return 0;
373 }
374
375 static int snd_card_dummy_playback_close(struct snd_pcm_substream *substream)
376 {
377         return 0;
378 }
379
380 static int snd_card_dummy_capture_close(struct snd_pcm_substream *substream)
381 {
382         return 0;
383 }
384
385 static struct snd_pcm_ops snd_card_dummy_playback_ops = {
386         .open =                 snd_card_dummy_playback_open,
387         .close =                snd_card_dummy_playback_close,
388         .ioctl =                snd_pcm_lib_ioctl,
389         .hw_params =            snd_card_dummy_hw_params,
390         .hw_free =              snd_card_dummy_hw_free,
391         .prepare =              snd_card_dummy_pcm_prepare,
392         .trigger =              snd_card_dummy_pcm_trigger,
393         .pointer =              snd_card_dummy_pcm_pointer,
394 };
395
396 static struct snd_pcm_ops snd_card_dummy_capture_ops = {
397         .open =                 snd_card_dummy_capture_open,
398         .close =                snd_card_dummy_capture_close,
399         .ioctl =                snd_pcm_lib_ioctl,
400         .hw_params =            snd_card_dummy_hw_params,
401         .hw_free =              snd_card_dummy_hw_free,
402         .prepare =              snd_card_dummy_pcm_prepare,
403         .trigger =              snd_card_dummy_pcm_trigger,
404         .pointer =              snd_card_dummy_pcm_pointer,
405 };
406
407 static int __init snd_card_dummy_pcm(struct snd_dummy *dummy, int device, int substreams)
408 {
409         struct snd_pcm *pcm;
410         int err;
411
412         if ((err = snd_pcm_new(dummy->card, "Dummy PCM", device,
413                                substreams, substreams, &pcm)) < 0)
414                 return err;
415         dummy->pcm = pcm;
416         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_card_dummy_playback_ops);
417         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_card_dummy_capture_ops);
418         pcm->private_data = dummy;
419         pcm->info_flags = 0;
420         strcpy(pcm->name, "Dummy PCM");
421         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
422                                               snd_dma_continuous_data(GFP_KERNEL),
423                                               0, 64*1024);
424         return 0;
425 }
426
427 #define DUMMY_VOLUME(xname, xindex, addr) \
428 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
429   .info = snd_dummy_volume_info, \
430   .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
431   .private_value = addr }
432
433 static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
434                                  struct snd_ctl_elem_info *uinfo)
435 {
436         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
437         uinfo->count = 2;
438         uinfo->value.integer.min = -50;
439         uinfo->value.integer.max = 100;
440         return 0;
441 }
442  
443 static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
444                                 struct snd_ctl_elem_value *ucontrol)
445 {
446         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
447         int addr = kcontrol->private_value;
448
449         spin_lock_irq(&dummy->mixer_lock);
450         ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
451         ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
452         spin_unlock_irq(&dummy->mixer_lock);
453         return 0;
454 }
455
456 static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
457                                 struct snd_ctl_elem_value *ucontrol)
458 {
459         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
460         int change, addr = kcontrol->private_value;
461         int left, right;
462
463         left = ucontrol->value.integer.value[0];
464         if (left < -50)
465                 left = -50;
466         if (left > 100)
467                 left = 100;
468         right = ucontrol->value.integer.value[1];
469         if (right < -50)
470                 right = -50;
471         if (right > 100)
472                 right = 100;
473         spin_lock_irq(&dummy->mixer_lock);
474         change = dummy->mixer_volume[addr][0] != left ||
475                  dummy->mixer_volume[addr][1] != right;
476         dummy->mixer_volume[addr][0] = left;
477         dummy->mixer_volume[addr][1] = right;
478         spin_unlock_irq(&dummy->mixer_lock);
479         return change;
480 }
481
482 #define DUMMY_CAPSRC(xname, xindex, addr) \
483 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
484   .info = snd_dummy_capsrc_info, \
485   .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
486   .private_value = addr }
487
488 static int snd_dummy_capsrc_info(struct snd_kcontrol *kcontrol,
489                                  struct snd_ctl_elem_info *uinfo)
490 {
491         uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
492         uinfo->count = 2;
493         uinfo->value.integer.min = 0;
494         uinfo->value.integer.max = 1;
495         return 0;
496 }
497  
498 static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
499                                 struct snd_ctl_elem_value *ucontrol)
500 {
501         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
502         int addr = kcontrol->private_value;
503
504         spin_lock_irq(&dummy->mixer_lock);
505         ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
506         ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
507         spin_unlock_irq(&dummy->mixer_lock);
508         return 0;
509 }
510
511 static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
512 {
513         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
514         int change, addr = kcontrol->private_value;
515         int left, right;
516
517         left = ucontrol->value.integer.value[0] & 1;
518         right = ucontrol->value.integer.value[1] & 1;
519         spin_lock_irq(&dummy->mixer_lock);
520         change = dummy->capture_source[addr][0] != left &&
521                  dummy->capture_source[addr][1] != right;
522         dummy->capture_source[addr][0] = left;
523         dummy->capture_source[addr][1] = right;
524         spin_unlock_irq(&dummy->mixer_lock);
525         return change;
526 }
527
528 static struct snd_kcontrol_new snd_dummy_controls[] = {
529 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
530 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
531 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
532 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_MASTER),
533 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
534 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_MASTER),
535 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
536 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MASTER),
537 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
538 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_MASTER)
539 };
540
541 static int __init snd_card_dummy_new_mixer(struct snd_dummy *dummy)
542 {
543         struct snd_card *card = dummy->card;
544         unsigned int idx;
545         int err;
546
547         snd_assert(dummy != NULL, return -EINVAL);
548         spin_lock_init(&dummy->mixer_lock);
549         strcpy(card->mixername, "Dummy Mixer");
550
551         for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
552                 if ((err = snd_ctl_add(card, snd_ctl_new1(&snd_dummy_controls[idx], dummy))) < 0)
553                         return err;
554         }
555         return 0;
556 }
557
558 static int __init snd_dummy_probe(struct platform_device *devptr)
559 {
560         struct snd_card *card;
561         struct snd_dummy *dummy;
562         int idx, err;
563         int dev = devptr->id;
564
565         card = snd_card_new(index[dev], id[dev], THIS_MODULE,
566                             sizeof(struct snd_dummy));
567         if (card == NULL)
568                 return -ENOMEM;
569         dummy = card->private_data;
570         dummy->card = card;
571         for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
572                 if (pcm_substreams[dev] < 1)
573                         pcm_substreams[dev] = 1;
574                 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
575                         pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
576                 if ((err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev])) < 0)
577                         goto __nodev;
578         }
579         if ((err = snd_card_dummy_new_mixer(dummy)) < 0)
580                 goto __nodev;
581         strcpy(card->driver, "Dummy");
582         strcpy(card->shortname, "Dummy");
583         sprintf(card->longname, "Dummy %i", dev + 1);
584
585         snd_card_set_dev(card, &devptr->dev);
586
587         if ((err = snd_card_register(card)) == 0) {
588                 platform_set_drvdata(devptr, card);
589                 return 0;
590         }
591       __nodev:
592         snd_card_free(card);
593         return err;
594 }
595
596 static int snd_dummy_remove(struct platform_device *devptr)
597 {
598         snd_card_free(platform_get_drvdata(devptr));
599         platform_set_drvdata(devptr, NULL);
600         return 0;
601 }
602
603 #ifdef CONFIG_PM
604 static int snd_dummy_suspend(struct platform_device *pdev, pm_message_t state)
605 {
606         struct snd_card *card = platform_get_drvdata(pdev);
607         struct snd_dummy *dummy = card->private_data;
608
609         snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
610         snd_pcm_suspend_all(dummy->pcm);
611         return 0;
612 }
613         
614 static int snd_dummy_resume(struct platform_device *pdev)
615 {
616         struct snd_card *card = platform_get_drvdata(pdev);
617
618         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
619         return 0;
620 }
621 #endif
622
623 #define SND_DUMMY_DRIVER        "snd_dummy"
624
625 static struct platform_driver snd_dummy_driver = {
626         .probe          = snd_dummy_probe,
627         .remove         = snd_dummy_remove,
628 #ifdef CONFIG_PM
629         .suspend        = snd_dummy_suspend,
630         .resume         = snd_dummy_resume,
631 #endif
632         .driver         = {
633                 .name   = SND_DUMMY_DRIVER
634         },
635 };
636
637 static int __init alsa_card_dummy_init(void)
638 {
639         int i, cards, err;
640
641         if ((err = platform_driver_register(&snd_dummy_driver)) < 0)
642                 return err;
643
644         cards = 0;
645         for (i = 0; i < SNDRV_CARDS && enable[i]; i++) {
646                 struct platform_device *device;
647                 device = platform_device_register_simple(SND_DUMMY_DRIVER,
648                                                          i, NULL, 0);
649                 if (IS_ERR(device)) {
650                         err = PTR_ERR(device);
651                         goto errout;
652                 }
653                 cards++;
654         }
655         if (!cards) {
656 #ifdef MODULE
657                 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
658 #endif
659                 err = -ENODEV;
660                 goto errout;
661         }
662         return 0;
663
664  errout:
665         platform_driver_unregister(&snd_dummy_driver);
666         return err;
667 }
668
669 static void __exit alsa_card_dummy_exit(void)
670 {
671         platform_driver_unregister(&snd_dummy_driver);
672 }
673
674 module_init(alsa_card_dummy_init)
675 module_exit(alsa_card_dummy_exit)