fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / sound / drivers / dummy.c
blobe008f3c58eaca172c19b0284d9100780bc705575
1 /*
2 * Dummy soundcard
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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.
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.
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
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>
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}}");
42 #define MAX_PCM_DEVICES 4
43 #define MAX_PCM_SUBSTREAMS 16
44 #define MAX_MIDI_DEVICES 2
46 #if 0 /* emu10k1 emulation */
47 #define MAX_BUFFER_SIZE (128 * 1024)
48 static int emu10k1_playback_constraints(struct snd_pcm_runtime *runtime)
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;
57 #define add_playback_constraints emu10k1_playback_constraints
58 #endif
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
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
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
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
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
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
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};
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.");
164 static struct platform_device *devices[SNDRV_CARDS];
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
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];
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;
195 static inline void snd_card_dummy_pcm_timer_start(struct snd_dummy_pcm *dpcm)
197 dpcm->timer.expires = 1 + jiffies;
198 add_timer(&dpcm->timer);
201 static inline void snd_card_dummy_pcm_timer_stop(struct snd_dummy_pcm *dpcm)
203 del_timer(&dpcm->timer);
206 static int snd_card_dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
208 struct snd_pcm_runtime *runtime = substream->runtime;
209 struct snd_dummy_pcm *dpcm = runtime->private_data;
210 int err = 0;
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;
226 spin_unlock(&dpcm->lock);
227 return 0;
230 static int snd_card_dummy_pcm_prepare(struct snd_pcm_substream *substream)
232 struct snd_pcm_runtime *runtime = substream->runtime;
233 struct snd_dummy_pcm *dpcm = runtime->private_data;
234 unsigned int bps;
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;
250 static void snd_card_dummy_pcm_timer_function(unsigned long data)
252 struct snd_dummy_pcm *dpcm = (struct snd_dummy_pcm *)data;
253 unsigned long flags;
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);
269 static snd_pcm_uframes_t snd_card_dummy_pcm_pointer(struct snd_pcm_substream *substream)
271 struct snd_pcm_runtime *runtime = substream->runtime;
272 struct snd_dummy_pcm *dpcm = runtime->private_data;
274 return bytes_to_frames(runtime, dpcm->pcm_buf_pos);
277 static struct snd_pcm_hardware snd_card_dummy_playback =
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,
295 static struct snd_pcm_hardware snd_card_dummy_capture =
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,
313 static void snd_card_dummy_runtime_free(struct snd_pcm_runtime *runtime)
315 kfree(runtime->private_data);
318 static int snd_card_dummy_hw_params(struct snd_pcm_substream *substream,
319 struct snd_pcm_hw_params *hw_params)
321 return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
324 static int snd_card_dummy_hw_free(struct snd_pcm_substream *substream)
326 return snd_pcm_lib_free_pages(substream);
329 static struct snd_dummy_pcm *new_pcm_stream(struct snd_pcm_substream *substream)
331 struct snd_dummy_pcm *dpcm;
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;
344 static int snd_card_dummy_playback_open(struct snd_pcm_substream *substream)
346 struct snd_pcm_runtime *runtime = substream->runtime;
347 struct snd_dummy_pcm *dpcm;
348 int err;
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;
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;
366 return 0;
369 static int snd_card_dummy_capture_open(struct snd_pcm_substream *substream)
371 struct snd_pcm_runtime *runtime = substream->runtime;
372 struct snd_dummy_pcm *dpcm;
373 int err;
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;
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;
391 return 0;
394 static int snd_card_dummy_playback_close(struct snd_pcm_substream *substream)
396 return 0;
399 static int snd_card_dummy_capture_close(struct snd_pcm_substream *substream)
401 return 0;
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,
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,
426 static int __devinit snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
427 int substreams)
429 struct snd_pcm *pcm;
430 int err;
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;
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 } }
456 static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
457 struct snd_ctl_elem_info *uinfo)
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;
466 static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
467 struct snd_ctl_elem_value *ucontrol)
469 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
470 int addr = kcontrol->private_value;
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;
479 static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
480 struct snd_ctl_elem_value *ucontrol)
482 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
483 int change, addr = kcontrol->private_value;
484 int left, right;
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;
505 static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0);
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 }
513 #define snd_dummy_capsrc_info snd_ctl_boolean_stereo_info
515 static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
516 struct snd_ctl_elem_value *ucontrol)
518 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
519 int addr = kcontrol->private_value;
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;
528 static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
530 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
531 int change, addr = kcontrol->private_value;
532 int left, right;
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;
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)
558 static int __devinit snd_card_dummy_new_mixer(struct snd_dummy *dummy)
560 struct snd_card *card = dummy->card;
561 unsigned int idx;
562 int err;
564 snd_assert(dummy != NULL, return -EINVAL);
565 spin_lock_init(&dummy->mixer_lock);
566 strcpy(card->mixername, "Dummy Mixer");
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;
572 return 0;
575 static int __devinit snd_dummy_probe(struct platform_device *devptr)
577 struct snd_card *card;
578 struct snd_dummy *dummy;
579 int idx, err;
580 int dev = devptr->id;
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;
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);
602 snd_card_set_dev(card, &devptr->dev);
604 if ((err = snd_card_register(card)) == 0) {
605 platform_set_drvdata(devptr, card);
606 return 0;
608 __nodev:
609 snd_card_free(card);
610 return err;
613 static int __devexit snd_dummy_remove(struct platform_device *devptr)
615 snd_card_free(platform_get_drvdata(devptr));
616 platform_set_drvdata(devptr, NULL);
617 return 0;
620 #ifdef CONFIG_PM
621 static int snd_dummy_suspend(struct platform_device *pdev, pm_message_t state)
623 struct snd_card *card = platform_get_drvdata(pdev);
624 struct snd_dummy *dummy = card->private_data;
626 snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
627 snd_pcm_suspend_all(dummy->pcm);
628 return 0;
631 static int snd_dummy_resume(struct platform_device *pdev)
633 struct snd_card *card = platform_get_drvdata(pdev);
635 snd_power_change_state(card, SNDRV_CTL_POWER_D0);
636 return 0;
638 #endif
640 #define SND_DUMMY_DRIVER "snd_dummy"
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
654 static void snd_dummy_unregister_all(void)
656 int i;
658 for (i = 0; i < ARRAY_SIZE(devices); ++i)
659 platform_device_unregister(devices[i]);
660 platform_driver_unregister(&snd_dummy_driver);
663 static int __init alsa_card_dummy_init(void)
665 int i, cards, err;
667 if ((err = platform_driver_register(&snd_dummy_driver)) < 0)
668 return err;
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;
683 devices[i] = device;
684 cards++;
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;
693 return 0;
696 static void __exit alsa_card_dummy_exit(void)
698 snd_dummy_unregister_all();
701 module_init(alsa_card_dummy_init)
702 module_exit(alsa_card_dummy_exit)