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TOMOYO Linux Cross Reference
Linux/sound/drivers/dummy.c

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  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/hrtimer.h>
 29 #include <linux/math64.h>
 30 #include <linux/module.h>
 31 #include <sound/core.h>
 32 #include <sound/control.h>
 33 #include <sound/tlv.h>
 34 #include <sound/pcm.h>
 35 #include <sound/rawmidi.h>
 36 #include <sound/info.h>
 37 #include <sound/initval.h>
 38 
 39 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
 40 MODULE_DESCRIPTION("Dummy soundcard (/dev/null)");
 41 MODULE_LICENSE("GPL");
 42 MODULE_SUPPORTED_DEVICE("{{ALSA,Dummy soundcard}}");
 43 
 44 #define MAX_PCM_DEVICES         4
 45 #define MAX_PCM_SUBSTREAMS      128
 46 #define MAX_MIDI_DEVICES        2
 47 
 48 /* defaults */
 49 #define MAX_BUFFER_SIZE         (64*1024)
 50 #define MIN_PERIOD_SIZE         64
 51 #define MAX_PERIOD_SIZE         MAX_BUFFER_SIZE
 52 #define USE_FORMATS             (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE)
 53 #define USE_RATE                SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000
 54 #define USE_RATE_MIN            5500
 55 #define USE_RATE_MAX            48000
 56 #define USE_CHANNELS_MIN        1
 57 #define USE_CHANNELS_MAX        2
 58 #define USE_PERIODS_MIN         1
 59 #define USE_PERIODS_MAX         1024
 60 
 61 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
 62 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
 63 static bool enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
 64 static char *model[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = NULL};
 65 static int pcm_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
 66 static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8};
 67 //static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 2};
 68 #ifdef CONFIG_HIGH_RES_TIMERS
 69 static bool hrtimer = 1;
 70 #endif
 71 static bool fake_buffer = 1;
 72 
 73 module_param_array(index, int, NULL, 0444);
 74 MODULE_PARM_DESC(index, "Index value for dummy soundcard.");
 75 module_param_array(id, charp, NULL, 0444);
 76 MODULE_PARM_DESC(id, "ID string for dummy soundcard.");
 77 module_param_array(enable, bool, NULL, 0444);
 78 MODULE_PARM_DESC(enable, "Enable this dummy soundcard.");
 79 module_param_array(model, charp, NULL, 0444);
 80 MODULE_PARM_DESC(model, "Soundcard model.");
 81 module_param_array(pcm_devs, int, NULL, 0444);
 82 MODULE_PARM_DESC(pcm_devs, "PCM devices # (0-4) for dummy driver.");
 83 module_param_array(pcm_substreams, int, NULL, 0444);
 84 MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-128) for dummy driver.");
 85 //module_param_array(midi_devs, int, NULL, 0444);
 86 //MODULE_PARM_DESC(midi_devs, "MIDI devices # (0-2) for dummy driver.");
 87 module_param(fake_buffer, bool, 0444);
 88 MODULE_PARM_DESC(fake_buffer, "Fake buffer allocations.");
 89 #ifdef CONFIG_HIGH_RES_TIMERS
 90 module_param(hrtimer, bool, 0644);
 91 MODULE_PARM_DESC(hrtimer, "Use hrtimer as the timer source.");
 92 #endif
 93 
 94 static struct platform_device *devices[SNDRV_CARDS];
 95 
 96 #define MIXER_ADDR_MASTER       0
 97 #define MIXER_ADDR_LINE         1
 98 #define MIXER_ADDR_MIC          2
 99 #define MIXER_ADDR_SYNTH        3
100 #define MIXER_ADDR_CD           4
101 #define MIXER_ADDR_LAST         4
102 
103 struct dummy_timer_ops {
104         int (*create)(struct snd_pcm_substream *);
105         void (*free)(struct snd_pcm_substream *);
106         int (*prepare)(struct snd_pcm_substream *);
107         int (*start)(struct snd_pcm_substream *);
108         int (*stop)(struct snd_pcm_substream *);
109         snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *);
110 };
111 
112 #define get_dummy_ops(substream) \
113         (*(const struct dummy_timer_ops **)(substream)->runtime->private_data)
114 
115 struct dummy_model {
116         const char *name;
117         int (*playback_constraints)(struct snd_pcm_runtime *runtime);
118         int (*capture_constraints)(struct snd_pcm_runtime *runtime);
119         u64 formats;
120         size_t buffer_bytes_max;
121         size_t period_bytes_min;
122         size_t period_bytes_max;
123         unsigned int periods_min;
124         unsigned int periods_max;
125         unsigned int rates;
126         unsigned int rate_min;
127         unsigned int rate_max;
128         unsigned int channels_min;
129         unsigned int channels_max;
130 };
131 
132 struct snd_dummy {
133         struct snd_card *card;
134         struct dummy_model *model;
135         struct snd_pcm *pcm;
136         struct snd_pcm_hardware pcm_hw;
137         spinlock_t mixer_lock;
138         int mixer_volume[MIXER_ADDR_LAST+1][2];
139         int capture_source[MIXER_ADDR_LAST+1][2];
140         int iobox;
141         struct snd_kcontrol *cd_volume_ctl;
142         struct snd_kcontrol *cd_switch_ctl;
143 };
144 
145 /*
146  * card models
147  */
148 
149 static int emu10k1_playback_constraints(struct snd_pcm_runtime *runtime)
150 {
151         int err;
152         err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
153         if (err < 0)
154                 return err;
155         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256, UINT_MAX);
156         if (err < 0)
157                 return err;
158         return 0;
159 }
160 
161 struct dummy_model model_emu10k1 = {
162         .name = "emu10k1",
163         .playback_constraints = emu10k1_playback_constraints,
164         .buffer_bytes_max = 128 * 1024,
165 };
166 
167 struct dummy_model model_rme9652 = {
168         .name = "rme9652",
169         .buffer_bytes_max = 26 * 64 * 1024,
170         .formats = SNDRV_PCM_FMTBIT_S32_LE,
171         .channels_min = 26,
172         .channels_max = 26,
173         .periods_min = 2,
174         .periods_max = 2,
175 };
176 
177 struct dummy_model model_ice1712 = {
178         .name = "ice1712",
179         .buffer_bytes_max = 256 * 1024,
180         .formats = SNDRV_PCM_FMTBIT_S32_LE,
181         .channels_min = 10,
182         .channels_max = 10,
183         .periods_min = 1,
184         .periods_max = 1024,
185 };
186 
187 struct dummy_model model_uda1341 = {
188         .name = "uda1341",
189         .buffer_bytes_max = 16380,
190         .formats = SNDRV_PCM_FMTBIT_S16_LE,
191         .channels_min = 2,
192         .channels_max = 2,
193         .periods_min = 2,
194         .periods_max = 255,
195 };
196 
197 struct dummy_model model_ac97 = {
198         .name = "ac97",
199         .formats = SNDRV_PCM_FMTBIT_S16_LE,
200         .channels_min = 2,
201         .channels_max = 2,
202         .rates = SNDRV_PCM_RATE_48000,
203         .rate_min = 48000,
204         .rate_max = 48000,
205 };
206 
207 struct dummy_model model_ca0106 = {
208         .name = "ca0106",
209         .formats = SNDRV_PCM_FMTBIT_S16_LE,
210         .buffer_bytes_max = ((65536-64)*8),
211         .period_bytes_max = (65536-64),
212         .periods_min = 2,
213         .periods_max = 8,
214         .channels_min = 2,
215         .channels_max = 2,
216         .rates = SNDRV_PCM_RATE_48000|SNDRV_PCM_RATE_96000|SNDRV_PCM_RATE_192000,
217         .rate_min = 48000,
218         .rate_max = 192000,
219 };
220 
221 struct dummy_model *dummy_models[] = {
222         &model_emu10k1,
223         &model_rme9652,
224         &model_ice1712,
225         &model_uda1341,
226         &model_ac97,
227         &model_ca0106,
228         NULL
229 };
230 
231 /*
232  * system timer interface
233  */
234 
235 struct dummy_systimer_pcm {
236         /* ops must be the first item */
237         const struct dummy_timer_ops *timer_ops;
238         spinlock_t lock;
239         struct timer_list timer;
240         unsigned long base_time;
241         unsigned int frac_pos;  /* fractional sample position (based HZ) */
242         unsigned int frac_period_rest;
243         unsigned int frac_buffer_size;  /* buffer_size * HZ */
244         unsigned int frac_period_size;  /* period_size * HZ */
245         unsigned int rate;
246         int elapsed;
247         struct snd_pcm_substream *substream;
248 };
249 
250 static void dummy_systimer_rearm(struct dummy_systimer_pcm *dpcm)
251 {
252         dpcm->timer.expires = jiffies +
253                 (dpcm->frac_period_rest + dpcm->rate - 1) / dpcm->rate;
254         add_timer(&dpcm->timer);
255 }
256 
257 static void dummy_systimer_update(struct dummy_systimer_pcm *dpcm)
258 {
259         unsigned long delta;
260 
261         delta = jiffies - dpcm->base_time;
262         if (!delta)
263                 return;
264         dpcm->base_time += delta;
265         delta *= dpcm->rate;
266         dpcm->frac_pos += delta;
267         while (dpcm->frac_pos >= dpcm->frac_buffer_size)
268                 dpcm->frac_pos -= dpcm->frac_buffer_size;
269         while (dpcm->frac_period_rest <= delta) {
270                 dpcm->elapsed++;
271                 dpcm->frac_period_rest += dpcm->frac_period_size;
272         }
273         dpcm->frac_period_rest -= delta;
274 }
275 
276 static int dummy_systimer_start(struct snd_pcm_substream *substream)
277 {
278         struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
279         spin_lock(&dpcm->lock);
280         dpcm->base_time = jiffies;
281         dummy_systimer_rearm(dpcm);
282         spin_unlock(&dpcm->lock);
283         return 0;
284 }
285 
286 static int dummy_systimer_stop(struct snd_pcm_substream *substream)
287 {
288         struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
289         spin_lock(&dpcm->lock);
290         del_timer(&dpcm->timer);
291         spin_unlock(&dpcm->lock);
292         return 0;
293 }
294 
295 static int dummy_systimer_prepare(struct snd_pcm_substream *substream)
296 {
297         struct snd_pcm_runtime *runtime = substream->runtime;
298         struct dummy_systimer_pcm *dpcm = runtime->private_data;
299 
300         dpcm->frac_pos = 0;
301         dpcm->rate = runtime->rate;
302         dpcm->frac_buffer_size = runtime->buffer_size * HZ;
303         dpcm->frac_period_size = runtime->period_size * HZ;
304         dpcm->frac_period_rest = dpcm->frac_period_size;
305         dpcm->elapsed = 0;
306 
307         return 0;
308 }
309 
310 static void dummy_systimer_callback(unsigned long data)
311 {
312         struct dummy_systimer_pcm *dpcm = (struct dummy_systimer_pcm *)data;
313         unsigned long flags;
314         int elapsed = 0;
315         
316         spin_lock_irqsave(&dpcm->lock, flags);
317         dummy_systimer_update(dpcm);
318         dummy_systimer_rearm(dpcm);
319         elapsed = dpcm->elapsed;
320         dpcm->elapsed = 0;
321         spin_unlock_irqrestore(&dpcm->lock, flags);
322         if (elapsed)
323                 snd_pcm_period_elapsed(dpcm->substream);
324 }
325 
326 static snd_pcm_uframes_t
327 dummy_systimer_pointer(struct snd_pcm_substream *substream)
328 {
329         struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
330         snd_pcm_uframes_t pos;
331 
332         spin_lock(&dpcm->lock);
333         dummy_systimer_update(dpcm);
334         pos = dpcm->frac_pos / HZ;
335         spin_unlock(&dpcm->lock);
336         return pos;
337 }
338 
339 static int dummy_systimer_create(struct snd_pcm_substream *substream)
340 {
341         struct dummy_systimer_pcm *dpcm;
342 
343         dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
344         if (!dpcm)
345                 return -ENOMEM;
346         substream->runtime->private_data = dpcm;
347         init_timer(&dpcm->timer);
348         dpcm->timer.data = (unsigned long) dpcm;
349         dpcm->timer.function = dummy_systimer_callback;
350         spin_lock_init(&dpcm->lock);
351         dpcm->substream = substream;
352         return 0;
353 }
354 
355 static void dummy_systimer_free(struct snd_pcm_substream *substream)
356 {
357         kfree(substream->runtime->private_data);
358 }
359 
360 static struct dummy_timer_ops dummy_systimer_ops = {
361         .create =       dummy_systimer_create,
362         .free =         dummy_systimer_free,
363         .prepare =      dummy_systimer_prepare,
364         .start =        dummy_systimer_start,
365         .stop =         dummy_systimer_stop,
366         .pointer =      dummy_systimer_pointer,
367 };
368 
369 #ifdef CONFIG_HIGH_RES_TIMERS
370 /*
371  * hrtimer interface
372  */
373 
374 struct dummy_hrtimer_pcm {
375         /* ops must be the first item */
376         const struct dummy_timer_ops *timer_ops;
377         ktime_t base_time;
378         ktime_t period_time;
379         atomic_t running;
380         struct hrtimer timer;
381         struct tasklet_struct tasklet;
382         struct snd_pcm_substream *substream;
383 };
384 
385 static void dummy_hrtimer_pcm_elapsed(unsigned long priv)
386 {
387         struct dummy_hrtimer_pcm *dpcm = (struct dummy_hrtimer_pcm *)priv;
388         if (atomic_read(&dpcm->running))
389                 snd_pcm_period_elapsed(dpcm->substream);
390 }
391 
392 static enum hrtimer_restart dummy_hrtimer_callback(struct hrtimer *timer)
393 {
394         struct dummy_hrtimer_pcm *dpcm;
395 
396         dpcm = container_of(timer, struct dummy_hrtimer_pcm, timer);
397         if (!atomic_read(&dpcm->running))
398                 return HRTIMER_NORESTART;
399         tasklet_schedule(&dpcm->tasklet);
400         hrtimer_forward_now(timer, dpcm->period_time);
401         return HRTIMER_RESTART;
402 }
403 
404 static int dummy_hrtimer_start(struct snd_pcm_substream *substream)
405 {
406         struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
407 
408         dpcm->base_time = hrtimer_cb_get_time(&dpcm->timer);
409         hrtimer_start(&dpcm->timer, dpcm->period_time, HRTIMER_MODE_REL);
410         atomic_set(&dpcm->running, 1);
411         return 0;
412 }
413 
414 static int dummy_hrtimer_stop(struct snd_pcm_substream *substream)
415 {
416         struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
417 
418         atomic_set(&dpcm->running, 0);
419         hrtimer_cancel(&dpcm->timer);
420         return 0;
421 }
422 
423 static inline void dummy_hrtimer_sync(struct dummy_hrtimer_pcm *dpcm)
424 {
425         hrtimer_cancel(&dpcm->timer);
426         tasklet_kill(&dpcm->tasklet);
427 }
428 
429 static snd_pcm_uframes_t
430 dummy_hrtimer_pointer(struct snd_pcm_substream *substream)
431 {
432         struct snd_pcm_runtime *runtime = substream->runtime;
433         struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
434         u64 delta;
435         u32 pos;
436 
437         delta = ktime_us_delta(hrtimer_cb_get_time(&dpcm->timer),
438                                dpcm->base_time);
439         delta = div_u64(delta * runtime->rate + 999999, 1000000);
440         div_u64_rem(delta, runtime->buffer_size, &pos);
441         return pos;
442 }
443 
444 static int dummy_hrtimer_prepare(struct snd_pcm_substream *substream)
445 {
446         struct snd_pcm_runtime *runtime = substream->runtime;
447         struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
448         unsigned int period, rate;
449         long sec;
450         unsigned long nsecs;
451 
452         dummy_hrtimer_sync(dpcm);
453         period = runtime->period_size;
454         rate = runtime->rate;
455         sec = period / rate;
456         period %= rate;
457         nsecs = div_u64((u64)period * 1000000000UL + rate - 1, rate);
458         dpcm->period_time = ktime_set(sec, nsecs);
459 
460         return 0;
461 }
462 
463 static int dummy_hrtimer_create(struct snd_pcm_substream *substream)
464 {
465         struct dummy_hrtimer_pcm *dpcm;
466 
467         dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
468         if (!dpcm)
469                 return -ENOMEM;
470         substream->runtime->private_data = dpcm;
471         hrtimer_init(&dpcm->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
472         dpcm->timer.function = dummy_hrtimer_callback;
473         dpcm->substream = substream;
474         atomic_set(&dpcm->running, 0);
475         tasklet_init(&dpcm->tasklet, dummy_hrtimer_pcm_elapsed,
476                      (unsigned long)dpcm);
477         return 0;
478 }
479 
480 static void dummy_hrtimer_free(struct snd_pcm_substream *substream)
481 {
482         struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
483         dummy_hrtimer_sync(dpcm);
484         kfree(dpcm);
485 }
486 
487 static struct dummy_timer_ops dummy_hrtimer_ops = {
488         .create =       dummy_hrtimer_create,
489         .free =         dummy_hrtimer_free,
490         .prepare =      dummy_hrtimer_prepare,
491         .start =        dummy_hrtimer_start,
492         .stop =         dummy_hrtimer_stop,
493         .pointer =      dummy_hrtimer_pointer,
494 };
495 
496 #endif /* CONFIG_HIGH_RES_TIMERS */
497 
498 /*
499  * PCM interface
500  */
501 
502 static int dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
503 {
504         switch (cmd) {
505         case SNDRV_PCM_TRIGGER_START:
506         case SNDRV_PCM_TRIGGER_RESUME:
507                 return get_dummy_ops(substream)->start(substream);
508         case SNDRV_PCM_TRIGGER_STOP:
509         case SNDRV_PCM_TRIGGER_SUSPEND:
510                 return get_dummy_ops(substream)->stop(substream);
511         }
512         return -EINVAL;
513 }
514 
515 static int dummy_pcm_prepare(struct snd_pcm_substream *substream)
516 {
517         return get_dummy_ops(substream)->prepare(substream);
518 }
519 
520 static snd_pcm_uframes_t dummy_pcm_pointer(struct snd_pcm_substream *substream)
521 {
522         return get_dummy_ops(substream)->pointer(substream);
523 }
524 
525 static struct snd_pcm_hardware dummy_pcm_hardware = {
526         .info =                 (SNDRV_PCM_INFO_MMAP |
527                                  SNDRV_PCM_INFO_INTERLEAVED |
528                                  SNDRV_PCM_INFO_RESUME |
529                                  SNDRV_PCM_INFO_MMAP_VALID),
530         .formats =              USE_FORMATS,
531         .rates =                USE_RATE,
532         .rate_min =             USE_RATE_MIN,
533         .rate_max =             USE_RATE_MAX,
534         .channels_min =         USE_CHANNELS_MIN,
535         .channels_max =         USE_CHANNELS_MAX,
536         .buffer_bytes_max =     MAX_BUFFER_SIZE,
537         .period_bytes_min =     MIN_PERIOD_SIZE,
538         .period_bytes_max =     MAX_PERIOD_SIZE,
539         .periods_min =          USE_PERIODS_MIN,
540         .periods_max =          USE_PERIODS_MAX,
541         .fifo_size =            0,
542 };
543 
544 static int dummy_pcm_hw_params(struct snd_pcm_substream *substream,
545                                struct snd_pcm_hw_params *hw_params)
546 {
547         if (fake_buffer) {
548                 /* runtime->dma_bytes has to be set manually to allow mmap */
549                 substream->runtime->dma_bytes = params_buffer_bytes(hw_params);
550                 return 0;
551         }
552         return snd_pcm_lib_malloc_pages(substream,
553                                         params_buffer_bytes(hw_params));
554 }
555 
556 static int dummy_pcm_hw_free(struct snd_pcm_substream *substream)
557 {
558         if (fake_buffer)
559                 return 0;
560         return snd_pcm_lib_free_pages(substream);
561 }
562 
563 static int dummy_pcm_open(struct snd_pcm_substream *substream)
564 {
565         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
566         struct dummy_model *model = dummy->model;
567         struct snd_pcm_runtime *runtime = substream->runtime;
568         const struct dummy_timer_ops *ops;
569         int err;
570 
571         ops = &dummy_systimer_ops;
572 #ifdef CONFIG_HIGH_RES_TIMERS
573         if (hrtimer)
574                 ops = &dummy_hrtimer_ops;
575 #endif
576 
577         err = ops->create(substream);
578         if (err < 0)
579                 return err;
580         get_dummy_ops(substream) = ops;
581 
582         runtime->hw = dummy->pcm_hw;
583         if (substream->pcm->device & 1) {
584                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
585                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
586         }
587         if (substream->pcm->device & 2)
588                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP |
589                                       SNDRV_PCM_INFO_MMAP_VALID);
590 
591         if (model == NULL)
592                 return 0;
593 
594         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
595                 if (model->playback_constraints)
596                         err = model->playback_constraints(substream->runtime);
597         } else {
598                 if (model->capture_constraints)
599                         err = model->capture_constraints(substream->runtime);
600         }
601         if (err < 0) {
602                 get_dummy_ops(substream)->free(substream);
603                 return err;
604         }
605         return 0;
606 }
607 
608 static int dummy_pcm_close(struct snd_pcm_substream *substream)
609 {
610         get_dummy_ops(substream)->free(substream);
611         return 0;
612 }
613 
614 /*
615  * dummy buffer handling
616  */
617 
618 static void *dummy_page[2];
619 
620 static void free_fake_buffer(void)
621 {
622         if (fake_buffer) {
623                 int i;
624                 for (i = 0; i < 2; i++)
625                         if (dummy_page[i]) {
626                                 free_page((unsigned long)dummy_page[i]);
627                                 dummy_page[i] = NULL;
628                         }
629         }
630 }
631 
632 static int alloc_fake_buffer(void)
633 {
634         int i;
635 
636         if (!fake_buffer)
637                 return 0;
638         for (i = 0; i < 2; i++) {
639                 dummy_page[i] = (void *)get_zeroed_page(GFP_KERNEL);
640                 if (!dummy_page[i]) {
641                         free_fake_buffer();
642                         return -ENOMEM;
643                 }
644         }
645         return 0;
646 }
647 
648 static int dummy_pcm_copy(struct snd_pcm_substream *substream,
649                           int channel, snd_pcm_uframes_t pos,
650                           void __user *dst, snd_pcm_uframes_t count)
651 {
652         return 0; /* do nothing */
653 }
654 
655 static int dummy_pcm_silence(struct snd_pcm_substream *substream,
656                              int channel, snd_pcm_uframes_t pos,
657                              snd_pcm_uframes_t count)
658 {
659         return 0; /* do nothing */
660 }
661 
662 static struct page *dummy_pcm_page(struct snd_pcm_substream *substream,
663                                    unsigned long offset)
664 {
665         return virt_to_page(dummy_page[substream->stream]); /* the same page */
666 }
667 
668 static struct snd_pcm_ops dummy_pcm_ops = {
669         .open =         dummy_pcm_open,
670         .close =        dummy_pcm_close,
671         .ioctl =        snd_pcm_lib_ioctl,
672         .hw_params =    dummy_pcm_hw_params,
673         .hw_free =      dummy_pcm_hw_free,
674         .prepare =      dummy_pcm_prepare,
675         .trigger =      dummy_pcm_trigger,
676         .pointer =      dummy_pcm_pointer,
677 };
678 
679 static struct snd_pcm_ops dummy_pcm_ops_no_buf = {
680         .open =         dummy_pcm_open,
681         .close =        dummy_pcm_close,
682         .ioctl =        snd_pcm_lib_ioctl,
683         .hw_params =    dummy_pcm_hw_params,
684         .hw_free =      dummy_pcm_hw_free,
685         .prepare =      dummy_pcm_prepare,
686         .trigger =      dummy_pcm_trigger,
687         .pointer =      dummy_pcm_pointer,
688         .copy =         dummy_pcm_copy,
689         .silence =      dummy_pcm_silence,
690         .page =         dummy_pcm_page,
691 };
692 
693 static int snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
694                               int substreams)
695 {
696         struct snd_pcm *pcm;
697         struct snd_pcm_ops *ops;
698         int err;
699 
700         err = snd_pcm_new(dummy->card, "Dummy PCM", device,
701                                substreams, substreams, &pcm);
702         if (err < 0)
703                 return err;
704         dummy->pcm = pcm;
705         if (fake_buffer)
706                 ops = &dummy_pcm_ops_no_buf;
707         else
708                 ops = &dummy_pcm_ops;
709         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, ops);
710         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, ops);
711         pcm->private_data = dummy;
712         pcm->info_flags = 0;
713         strcpy(pcm->name, "Dummy PCM");
714         if (!fake_buffer) {
715                 snd_pcm_lib_preallocate_pages_for_all(pcm,
716                         SNDRV_DMA_TYPE_CONTINUOUS,
717                         snd_dma_continuous_data(GFP_KERNEL),
718                         0, 64*1024);
719         }
720         return 0;
721 }
722 
723 /*
724  * mixer interface
725  */
726 
727 #define DUMMY_VOLUME(xname, xindex, addr) \
728 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
729   .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
730   .name = xname, .index = xindex, \
731   .info = snd_dummy_volume_info, \
732   .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
733   .private_value = addr, \
734   .tlv = { .p = db_scale_dummy } }
735 
736 static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
737                                  struct snd_ctl_elem_info *uinfo)
738 {
739         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
740         uinfo->count = 2;
741         uinfo->value.integer.min = -50;
742         uinfo->value.integer.max = 100;
743         return 0;
744 }
745  
746 static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
747                                 struct snd_ctl_elem_value *ucontrol)
748 {
749         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
750         int addr = kcontrol->private_value;
751 
752         spin_lock_irq(&dummy->mixer_lock);
753         ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
754         ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
755         spin_unlock_irq(&dummy->mixer_lock);
756         return 0;
757 }
758 
759 static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
760                                 struct snd_ctl_elem_value *ucontrol)
761 {
762         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
763         int change, addr = kcontrol->private_value;
764         int left, right;
765 
766         left = ucontrol->value.integer.value[0];
767         if (left < -50)
768                 left = -50;
769         if (left > 100)
770                 left = 100;
771         right = ucontrol->value.integer.value[1];
772         if (right < -50)
773                 right = -50;
774         if (right > 100)
775                 right = 100;
776         spin_lock_irq(&dummy->mixer_lock);
777         change = dummy->mixer_volume[addr][0] != left ||
778                  dummy->mixer_volume[addr][1] != right;
779         dummy->mixer_volume[addr][0] = left;
780         dummy->mixer_volume[addr][1] = right;
781         spin_unlock_irq(&dummy->mixer_lock);
782         return change;
783 }
784 
785 static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0);
786 
787 #define DUMMY_CAPSRC(xname, xindex, addr) \
788 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
789   .info = snd_dummy_capsrc_info, \
790   .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
791   .private_value = addr }
792 
793 #define snd_dummy_capsrc_info   snd_ctl_boolean_stereo_info
794  
795 static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
796                                 struct snd_ctl_elem_value *ucontrol)
797 {
798         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
799         int addr = kcontrol->private_value;
800 
801         spin_lock_irq(&dummy->mixer_lock);
802         ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
803         ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
804         spin_unlock_irq(&dummy->mixer_lock);
805         return 0;
806 }
807 
808 static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
809 {
810         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
811         int change, addr = kcontrol->private_value;
812         int left, right;
813 
814         left = ucontrol->value.integer.value[0] & 1;
815         right = ucontrol->value.integer.value[1] & 1;
816         spin_lock_irq(&dummy->mixer_lock);
817         change = dummy->capture_source[addr][0] != left &&
818                  dummy->capture_source[addr][1] != right;
819         dummy->capture_source[addr][0] = left;
820         dummy->capture_source[addr][1] = right;
821         spin_unlock_irq(&dummy->mixer_lock);
822         return change;
823 }
824 
825 static int snd_dummy_iobox_info(struct snd_kcontrol *kcontrol,
826                                 struct snd_ctl_elem_info *info)
827 {
828         const char *const names[] = { "None", "CD Player" };
829 
830         return snd_ctl_enum_info(info, 1, 2, names);
831 }
832 
833 static int snd_dummy_iobox_get(struct snd_kcontrol *kcontrol,
834                                struct snd_ctl_elem_value *value)
835 {
836         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
837 
838         value->value.enumerated.item[0] = dummy->iobox;
839         return 0;
840 }
841 
842 static int snd_dummy_iobox_put(struct snd_kcontrol *kcontrol,
843                                struct snd_ctl_elem_value *value)
844 {
845         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
846         int changed;
847 
848         if (value->value.enumerated.item[0] > 1)
849                 return -EINVAL;
850 
851         changed = value->value.enumerated.item[0] != dummy->iobox;
852         if (changed) {
853                 dummy->iobox = value->value.enumerated.item[0];
854 
855                 if (dummy->iobox) {
856                         dummy->cd_volume_ctl->vd[0].access &=
857                                 ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
858                         dummy->cd_switch_ctl->vd[0].access &=
859                                 ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
860                 } else {
861                         dummy->cd_volume_ctl->vd[0].access |=
862                                 SNDRV_CTL_ELEM_ACCESS_INACTIVE;
863                         dummy->cd_switch_ctl->vd[0].access |=
864                                 SNDRV_CTL_ELEM_ACCESS_INACTIVE;
865                 }
866 
867                 snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,
868                                &dummy->cd_volume_ctl->id);
869                 snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,
870                                &dummy->cd_switch_ctl->id);
871         }
872 
873         return changed;
874 }
875 
876 static struct snd_kcontrol_new snd_dummy_controls[] = {
877 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
878 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
879 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
880 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH),
881 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
882 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE),
883 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
884 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC),
885 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
886 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD),
887 {
888         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
889         .name  = "External I/O Box",
890         .info  = snd_dummy_iobox_info,
891         .get   = snd_dummy_iobox_get,
892         .put   = snd_dummy_iobox_put,
893 },
894 };
895 
896 static int snd_card_dummy_new_mixer(struct snd_dummy *dummy)
897 {
898         struct snd_card *card = dummy->card;
899         struct snd_kcontrol *kcontrol;
900         unsigned int idx;
901         int err;
902 
903         spin_lock_init(&dummy->mixer_lock);
904         strcpy(card->mixername, "Dummy Mixer");
905         dummy->iobox = 1;
906 
907         for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
908                 kcontrol = snd_ctl_new1(&snd_dummy_controls[idx], dummy);
909                 err = snd_ctl_add(card, kcontrol);
910                 if (err < 0)
911                         return err;
912                 if (!strcmp(kcontrol->id.name, "CD Volume"))
913                         dummy->cd_volume_ctl = kcontrol;
914                 else if (!strcmp(kcontrol->id.name, "CD Capture Switch"))
915                         dummy->cd_switch_ctl = kcontrol;
916 
917         }
918         return 0;
919 }
920 
921 #if defined(CONFIG_SND_DEBUG) && defined(CONFIG_PROC_FS)
922 /*
923  * proc interface
924  */
925 static void print_formats(struct snd_dummy *dummy,
926                           struct snd_info_buffer *buffer)
927 {
928         int i;
929 
930         for (i = 0; i < SNDRV_PCM_FORMAT_LAST; i++) {
931                 if (dummy->pcm_hw.formats & (1ULL << i))
932                         snd_iprintf(buffer, " %s", snd_pcm_format_name(i));
933         }
934 }
935 
936 static void print_rates(struct snd_dummy *dummy,
937                         struct snd_info_buffer *buffer)
938 {
939         static int rates[] = {
940                 5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000,
941                 64000, 88200, 96000, 176400, 192000,
942         };
943         int i;
944 
945         if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_CONTINUOUS)
946                 snd_iprintf(buffer, " continuous");
947         if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_KNOT)
948                 snd_iprintf(buffer, " knot");
949         for (i = 0; i < ARRAY_SIZE(rates); i++)
950                 if (dummy->pcm_hw.rates & (1 << i))
951                         snd_iprintf(buffer, " %d", rates[i]);
952 }
953 
954 #define get_dummy_int_ptr(dummy, ofs) \
955         (unsigned int *)((char *)&((dummy)->pcm_hw) + (ofs))
956 #define get_dummy_ll_ptr(dummy, ofs) \
957         (unsigned long long *)((char *)&((dummy)->pcm_hw) + (ofs))
958 
959 struct dummy_hw_field {
960         const char *name;
961         const char *format;
962         unsigned int offset;
963         unsigned int size;
964 };
965 #define FIELD_ENTRY(item, fmt) {                   \
966         .name = #item,                             \
967         .format = fmt,                             \
968         .offset = offsetof(struct snd_pcm_hardware, item), \
969         .size = sizeof(dummy_pcm_hardware.item) }
970 
971 static struct dummy_hw_field fields[] = {
972         FIELD_ENTRY(formats, "%#llx"),
973         FIELD_ENTRY(rates, "%#x"),
974         FIELD_ENTRY(rate_min, "%d"),
975         FIELD_ENTRY(rate_max, "%d"),
976         FIELD_ENTRY(channels_min, "%d"),
977         FIELD_ENTRY(channels_max, "%d"),
978         FIELD_ENTRY(buffer_bytes_max, "%ld"),
979         FIELD_ENTRY(period_bytes_min, "%ld"),
980         FIELD_ENTRY(period_bytes_max, "%ld"),
981         FIELD_ENTRY(periods_min, "%d"),
982         FIELD_ENTRY(periods_max, "%d"),
983 };
984 
985 static void dummy_proc_read(struct snd_info_entry *entry,
986                             struct snd_info_buffer *buffer)
987 {
988         struct snd_dummy *dummy = entry->private_data;
989         int i;
990 
991         for (i = 0; i < ARRAY_SIZE(fields); i++) {
992                 snd_iprintf(buffer, "%s ", fields[i].name);
993                 if (fields[i].size == sizeof(int))
994                         snd_iprintf(buffer, fields[i].format,
995                                 *get_dummy_int_ptr(dummy, fields[i].offset));
996                 else
997                         snd_iprintf(buffer, fields[i].format,
998                                 *get_dummy_ll_ptr(dummy, fields[i].offset));
999                 if (!strcmp(fields[i].name, "formats"))
1000                         print_formats(dummy, buffer);
1001                 else if (!strcmp(fields[i].name, "rates"))
1002                         print_rates(dummy, buffer);
1003                 snd_iprintf(buffer, "\n");
1004         }
1005 }
1006 
1007 static void dummy_proc_write(struct snd_info_entry *entry,
1008                              struct snd_info_buffer *buffer)
1009 {
1010         struct snd_dummy *dummy = entry->private_data;
1011         char line[64];
1012 
1013         while (!snd_info_get_line(buffer, line, sizeof(line))) {
1014                 char item[20];
1015                 const char *ptr;
1016                 unsigned long long val;
1017                 int i;
1018 
1019                 ptr = snd_info_get_str(item, line, sizeof(item));
1020                 for (i = 0; i < ARRAY_SIZE(fields); i++) {
1021                         if (!strcmp(item, fields[i].name))
1022                                 break;
1023                 }
1024                 if (i >= ARRAY_SIZE(fields))
1025                         continue;
1026                 snd_info_get_str(item, ptr, sizeof(item));
1027                 if (strict_strtoull(item, 0, &val))
1028                         continue;
1029                 if (fields[i].size == sizeof(int))
1030                         *get_dummy_int_ptr(dummy, fields[i].offset) = val;
1031                 else
1032                         *get_dummy_ll_ptr(dummy, fields[i].offset) = val;
1033         }
1034 }
1035 
1036 static void dummy_proc_init(struct snd_dummy *chip)
1037 {
1038         struct snd_info_entry *entry;
1039 
1040         if (!snd_card_proc_new(chip->card, "dummy_pcm", &entry)) {
1041                 snd_info_set_text_ops(entry, chip, dummy_proc_read);
1042                 entry->c.text.write = dummy_proc_write;
1043                 entry->mode |= S_IWUSR;
1044                 entry->private_data = chip;
1045         }
1046 }
1047 #else
1048 #define dummy_proc_init(x)
1049 #endif /* CONFIG_SND_DEBUG && CONFIG_PROC_FS */
1050 
1051 static int snd_dummy_probe(struct platform_device *devptr)
1052 {
1053         struct snd_card *card;
1054         struct snd_dummy *dummy;
1055         struct dummy_model *m = NULL, **mdl;
1056         int idx, err;
1057         int dev = devptr->id;
1058 
1059         err = snd_card_create(index[dev], id[dev], THIS_MODULE,
1060                               sizeof(struct snd_dummy), &card);
1061         if (err < 0)
1062                 return err;
1063         dummy = card->private_data;
1064         dummy->card = card;
1065         for (mdl = dummy_models; *mdl && model[dev]; mdl++) {
1066                 if (strcmp(model[dev], (*mdl)->name) == 0) {
1067                         printk(KERN_INFO
1068                                 "snd-dummy: Using model '%s' for card %i\n",
1069                                 (*mdl)->name, card->number);
1070                         m = dummy->model = *mdl;
1071                         break;
1072                 }
1073         }
1074         for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
1075                 if (pcm_substreams[dev] < 1)
1076                         pcm_substreams[dev] = 1;
1077                 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
1078                         pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
1079                 err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev]);
1080                 if (err < 0)
1081                         goto __nodev;
1082         }
1083 
1084         dummy->pcm_hw = dummy_pcm_hardware;
1085         if (m) {
1086                 if (m->formats)
1087                         dummy->pcm_hw.formats = m->formats;
1088                 if (m->buffer_bytes_max)
1089                         dummy->pcm_hw.buffer_bytes_max = m->buffer_bytes_max;
1090                 if (m->period_bytes_min)
1091                         dummy->pcm_hw.period_bytes_min = m->period_bytes_min;
1092                 if (m->period_bytes_max)
1093                         dummy->pcm_hw.period_bytes_max = m->period_bytes_max;
1094                 if (m->periods_min)
1095                         dummy->pcm_hw.periods_min = m->periods_min;
1096                 if (m->periods_max)
1097                         dummy->pcm_hw.periods_max = m->periods_max;
1098                 if (m->rates)
1099                         dummy->pcm_hw.rates = m->rates;
1100                 if (m->rate_min)
1101                         dummy->pcm_hw.rate_min = m->rate_min;
1102                 if (m->rate_max)
1103                         dummy->pcm_hw.rate_max = m->rate_max;
1104                 if (m->channels_min)
1105                         dummy->pcm_hw.channels_min = m->channels_min;
1106                 if (m->channels_max)
1107                         dummy->pcm_hw.channels_max = m->channels_max;
1108         }
1109 
1110         err = snd_card_dummy_new_mixer(dummy);
1111         if (err < 0)
1112                 goto __nodev;
1113         strcpy(card->driver, "Dummy");
1114         strcpy(card->shortname, "Dummy");
1115         sprintf(card->longname, "Dummy %i", dev + 1);
1116 
1117         dummy_proc_init(dummy);
1118 
1119         snd_card_set_dev(card, &devptr->dev);
1120 
1121         err = snd_card_register(card);
1122         if (err == 0) {
1123                 platform_set_drvdata(devptr, card);
1124                 return 0;
1125         }
1126       __nodev:
1127         snd_card_free(card);
1128         return err;
1129 }
1130 
1131 static int snd_dummy_remove(struct platform_device *devptr)
1132 {
1133         snd_card_free(platform_get_drvdata(devptr));
1134         platform_set_drvdata(devptr, NULL);
1135         return 0;
1136 }
1137 
1138 #ifdef CONFIG_PM_SLEEP
1139 static int snd_dummy_suspend(struct device *pdev)
1140 {
1141         struct snd_card *card = dev_get_drvdata(pdev);
1142         struct snd_dummy *dummy = card->private_data;
1143 
1144         snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
1145         snd_pcm_suspend_all(dummy->pcm);
1146         return 0;
1147 }
1148         
1149 static int snd_dummy_resume(struct device *pdev)
1150 {
1151         struct snd_card *card = dev_get_drvdata(pdev);
1152 
1153         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
1154         return 0;
1155 }
1156 
1157 static SIMPLE_DEV_PM_OPS(snd_dummy_pm, snd_dummy_suspend, snd_dummy_resume);
1158 #define SND_DUMMY_PM_OPS        &snd_dummy_pm
1159 #else
1160 #define SND_DUMMY_PM_OPS        NULL
1161 #endif
1162 
1163 #define SND_DUMMY_DRIVER        "snd_dummy"
1164 
1165 static struct platform_driver snd_dummy_driver = {
1166         .probe          = snd_dummy_probe,
1167         .remove         = snd_dummy_remove,
1168         .driver         = {
1169                 .name   = SND_DUMMY_DRIVER,
1170                 .owner  = THIS_MODULE,
1171                 .pm     = SND_DUMMY_PM_OPS,
1172         },
1173 };
1174 
1175 static void snd_dummy_unregister_all(void)
1176 {
1177         int i;
1178 
1179         for (i = 0; i < ARRAY_SIZE(devices); ++i)
1180                 platform_device_unregister(devices[i]);
1181         platform_driver_unregister(&snd_dummy_driver);
1182         free_fake_buffer();
1183 }
1184 
1185 static int __init alsa_card_dummy_init(void)
1186 {
1187         int i, cards, err;
1188 
1189         err = platform_driver_register(&snd_dummy_driver);
1190         if (err < 0)
1191                 return err;
1192 
1193         err = alloc_fake_buffer();
1194         if (err < 0) {
1195                 platform_driver_unregister(&snd_dummy_driver);
1196                 return err;
1197         }
1198 
1199         cards = 0;
1200         for (i = 0; i < SNDRV_CARDS; i++) {
1201                 struct platform_device *device;
1202                 if (! enable[i])
1203                         continue;
1204                 device = platform_device_register_simple(SND_DUMMY_DRIVER,
1205                                                          i, NULL, 0);
1206                 if (IS_ERR(device))
1207                         continue;
1208                 if (!platform_get_drvdata(device)) {
1209                         platform_device_unregister(device);
1210                         continue;
1211                 }
1212                 devices[i] = device;
1213                 cards++;
1214         }
1215         if (!cards) {
1216 #ifdef MODULE
1217                 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
1218 #endif
1219                 snd_dummy_unregister_all();
1220                 return -ENODEV;
1221         }
1222         return 0;
1223 }
1224 
1225 static void __exit alsa_card_dummy_exit(void)
1226 {
1227         snd_dummy_unregister_all();
1228 }
1229 
1230 module_init(alsa_card_dummy_init)
1231 module_exit(alsa_card_dummy_exit)
1232 

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