Version:  2.0.40 2.2.26 2.4.37 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6

Linux/sound/drivers/dummy.c

  1 /*
  2  *  Dummy soundcard
  3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
  4  *
  5  *   This program is free software; you can redistribute it and/or modify
  6  *   it under the terms of the GNU General Public License as published by
  7  *   the Free Software Foundation; either version 2 of the License, or
  8  *   (at your option) any later version.
  9  *
 10  *   This program is distributed in the hope that it will be useful,
 11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 13  *   GNU General Public License for more details.
 14  *
 15  *   You should have received a copy of the GNU General Public License
 16  *   along with this program; if not, write to the Free Software
 17  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 18  *
 19  */
 20 
 21 #include <linux/init.h>
 22 #include <linux/err.h>
 23 #include <linux/platform_device.h>
 24 #include <linux/jiffies.h>
 25 #include <linux/slab.h>
 26 #include <linux/time.h>
 27 #include <linux/wait.h>
 28 #include <linux/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 static struct dummy_model model_emu10k1 = {
162         .name = "emu10k1",
163         .playback_constraints = emu10k1_playback_constraints,
164         .buffer_bytes_max = 128 * 1024,
165 };
166 
167 static 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 static 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 static 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 static 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 static 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 static 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         mod_timer(&dpcm->timer, jiffies +
253                 (dpcm->frac_period_rest + dpcm->rate - 1) / dpcm->rate);
254 }
255 
256 static void dummy_systimer_update(struct dummy_systimer_pcm *dpcm)
257 {
258         unsigned long delta;
259 
260         delta = jiffies - dpcm->base_time;
261         if (!delta)
262                 return;
263         dpcm->base_time += delta;
264         delta *= dpcm->rate;
265         dpcm->frac_pos += delta;
266         while (dpcm->frac_pos >= dpcm->frac_buffer_size)
267                 dpcm->frac_pos -= dpcm->frac_buffer_size;
268         while (dpcm->frac_period_rest <= delta) {
269                 dpcm->elapsed++;
270                 dpcm->frac_period_rest += dpcm->frac_period_size;
271         }
272         dpcm->frac_period_rest -= delta;
273 }
274 
275 static int dummy_systimer_start(struct snd_pcm_substream *substream)
276 {
277         struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
278         spin_lock(&dpcm->lock);
279         dpcm->base_time = jiffies;
280         dummy_systimer_rearm(dpcm);
281         spin_unlock(&dpcm->lock);
282         return 0;
283 }
284 
285 static int dummy_systimer_stop(struct snd_pcm_substream *substream)
286 {
287         struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
288         spin_lock(&dpcm->lock);
289         del_timer(&dpcm->timer);
290         spin_unlock(&dpcm->lock);
291         return 0;
292 }
293 
294 static int dummy_systimer_prepare(struct snd_pcm_substream *substream)
295 {
296         struct snd_pcm_runtime *runtime = substream->runtime;
297         struct dummy_systimer_pcm *dpcm = runtime->private_data;
298 
299         dpcm->frac_pos = 0;
300         dpcm->rate = runtime->rate;
301         dpcm->frac_buffer_size = runtime->buffer_size * HZ;
302         dpcm->frac_period_size = runtime->period_size * HZ;
303         dpcm->frac_period_rest = dpcm->frac_period_size;
304         dpcm->elapsed = 0;
305 
306         return 0;
307 }
308 
309 static void dummy_systimer_callback(unsigned long data)
310 {
311         struct dummy_systimer_pcm *dpcm = (struct dummy_systimer_pcm *)data;
312         unsigned long flags;
313         int elapsed = 0;
314         
315         spin_lock_irqsave(&dpcm->lock, flags);
316         dummy_systimer_update(dpcm);
317         dummy_systimer_rearm(dpcm);
318         elapsed = dpcm->elapsed;
319         dpcm->elapsed = 0;
320         spin_unlock_irqrestore(&dpcm->lock, flags);
321         if (elapsed)
322                 snd_pcm_period_elapsed(dpcm->substream);
323 }
324 
325 static snd_pcm_uframes_t
326 dummy_systimer_pointer(struct snd_pcm_substream *substream)
327 {
328         struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
329         snd_pcm_uframes_t pos;
330 
331         spin_lock(&dpcm->lock);
332         dummy_systimer_update(dpcm);
333         pos = dpcm->frac_pos / HZ;
334         spin_unlock(&dpcm->lock);
335         return pos;
336 }
337 
338 static int dummy_systimer_create(struct snd_pcm_substream *substream)
339 {
340         struct dummy_systimer_pcm *dpcm;
341 
342         dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
343         if (!dpcm)
344                 return -ENOMEM;
345         substream->runtime->private_data = dpcm;
346         setup_timer(&dpcm->timer, dummy_systimer_callback,
347                         (unsigned long) dpcm);
348         spin_lock_init(&dpcm->lock);
349         dpcm->substream = substream;
350         return 0;
351 }
352 
353 static void dummy_systimer_free(struct snd_pcm_substream *substream)
354 {
355         kfree(substream->runtime->private_data);
356 }
357 
358 static const struct dummy_timer_ops dummy_systimer_ops = {
359         .create =       dummy_systimer_create,
360         .free =         dummy_systimer_free,
361         .prepare =      dummy_systimer_prepare,
362         .start =        dummy_systimer_start,
363         .stop =         dummy_systimer_stop,
364         .pointer =      dummy_systimer_pointer,
365 };
366 
367 #ifdef CONFIG_HIGH_RES_TIMERS
368 /*
369  * hrtimer interface
370  */
371 
372 struct dummy_hrtimer_pcm {
373         /* ops must be the first item */
374         const struct dummy_timer_ops *timer_ops;
375         ktime_t base_time;
376         ktime_t period_time;
377         atomic_t running;
378         struct hrtimer timer;
379         struct tasklet_struct tasklet;
380         struct snd_pcm_substream *substream;
381 };
382 
383 static void dummy_hrtimer_pcm_elapsed(unsigned long priv)
384 {
385         struct dummy_hrtimer_pcm *dpcm = (struct dummy_hrtimer_pcm *)priv;
386         if (atomic_read(&dpcm->running))
387                 snd_pcm_period_elapsed(dpcm->substream);
388 }
389 
390 static enum hrtimer_restart dummy_hrtimer_callback(struct hrtimer *timer)
391 {
392         struct dummy_hrtimer_pcm *dpcm;
393 
394         dpcm = container_of(timer, struct dummy_hrtimer_pcm, timer);
395         if (!atomic_read(&dpcm->running))
396                 return HRTIMER_NORESTART;
397         tasklet_schedule(&dpcm->tasklet);
398         hrtimer_forward_now(timer, dpcm->period_time);
399         return HRTIMER_RESTART;
400 }
401 
402 static int dummy_hrtimer_start(struct snd_pcm_substream *substream)
403 {
404         struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
405 
406         dpcm->base_time = hrtimer_cb_get_time(&dpcm->timer);
407         hrtimer_start(&dpcm->timer, dpcm->period_time, HRTIMER_MODE_REL);
408         atomic_set(&dpcm->running, 1);
409         return 0;
410 }
411 
412 static int dummy_hrtimer_stop(struct snd_pcm_substream *substream)
413 {
414         struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
415 
416         atomic_set(&dpcm->running, 0);
417         hrtimer_cancel(&dpcm->timer);
418         return 0;
419 }
420 
421 static inline void dummy_hrtimer_sync(struct dummy_hrtimer_pcm *dpcm)
422 {
423         tasklet_kill(&dpcm->tasklet);
424 }
425 
426 static snd_pcm_uframes_t
427 dummy_hrtimer_pointer(struct snd_pcm_substream *substream)
428 {
429         struct snd_pcm_runtime *runtime = substream->runtime;
430         struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
431         u64 delta;
432         u32 pos;
433 
434         delta = ktime_us_delta(hrtimer_cb_get_time(&dpcm->timer),
435                                dpcm->base_time);
436         delta = div_u64(delta * runtime->rate + 999999, 1000000);
437         div_u64_rem(delta, runtime->buffer_size, &pos);
438         return pos;
439 }
440 
441 static int dummy_hrtimer_prepare(struct snd_pcm_substream *substream)
442 {
443         struct snd_pcm_runtime *runtime = substream->runtime;
444         struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
445         unsigned int period, rate;
446         long sec;
447         unsigned long nsecs;
448 
449         dummy_hrtimer_sync(dpcm);
450         period = runtime->period_size;
451         rate = runtime->rate;
452         sec = period / rate;
453         period %= rate;
454         nsecs = div_u64((u64)period * 1000000000UL + rate - 1, rate);
455         dpcm->period_time = ktime_set(sec, nsecs);
456 
457         return 0;
458 }
459 
460 static int dummy_hrtimer_create(struct snd_pcm_substream *substream)
461 {
462         struct dummy_hrtimer_pcm *dpcm;
463 
464         dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
465         if (!dpcm)
466                 return -ENOMEM;
467         substream->runtime->private_data = dpcm;
468         hrtimer_init(&dpcm->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
469         dpcm->timer.function = dummy_hrtimer_callback;
470         dpcm->substream = substream;
471         atomic_set(&dpcm->running, 0);
472         tasklet_init(&dpcm->tasklet, dummy_hrtimer_pcm_elapsed,
473                      (unsigned long)dpcm);
474         return 0;
475 }
476 
477 static void dummy_hrtimer_free(struct snd_pcm_substream *substream)
478 {
479         struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
480         dummy_hrtimer_sync(dpcm);
481         kfree(dpcm);
482 }
483 
484 static const struct dummy_timer_ops dummy_hrtimer_ops = {
485         .create =       dummy_hrtimer_create,
486         .free =         dummy_hrtimer_free,
487         .prepare =      dummy_hrtimer_prepare,
488         .start =        dummy_hrtimer_start,
489         .stop =         dummy_hrtimer_stop,
490         .pointer =      dummy_hrtimer_pointer,
491 };
492 
493 #endif /* CONFIG_HIGH_RES_TIMERS */
494 
495 /*
496  * PCM interface
497  */
498 
499 static int dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
500 {
501         switch (cmd) {
502         case SNDRV_PCM_TRIGGER_START:
503         case SNDRV_PCM_TRIGGER_RESUME:
504                 return get_dummy_ops(substream)->start(substream);
505         case SNDRV_PCM_TRIGGER_STOP:
506         case SNDRV_PCM_TRIGGER_SUSPEND:
507                 return get_dummy_ops(substream)->stop(substream);
508         }
509         return -EINVAL;
510 }
511 
512 static int dummy_pcm_prepare(struct snd_pcm_substream *substream)
513 {
514         return get_dummy_ops(substream)->prepare(substream);
515 }
516 
517 static snd_pcm_uframes_t dummy_pcm_pointer(struct snd_pcm_substream *substream)
518 {
519         return get_dummy_ops(substream)->pointer(substream);
520 }
521 
522 static struct snd_pcm_hardware dummy_pcm_hardware = {
523         .info =                 (SNDRV_PCM_INFO_MMAP |
524                                  SNDRV_PCM_INFO_INTERLEAVED |
525                                  SNDRV_PCM_INFO_RESUME |
526                                  SNDRV_PCM_INFO_MMAP_VALID),
527         .formats =              USE_FORMATS,
528         .rates =                USE_RATE,
529         .rate_min =             USE_RATE_MIN,
530         .rate_max =             USE_RATE_MAX,
531         .channels_min =         USE_CHANNELS_MIN,
532         .channels_max =         USE_CHANNELS_MAX,
533         .buffer_bytes_max =     MAX_BUFFER_SIZE,
534         .period_bytes_min =     MIN_PERIOD_SIZE,
535         .period_bytes_max =     MAX_PERIOD_SIZE,
536         .periods_min =          USE_PERIODS_MIN,
537         .periods_max =          USE_PERIODS_MAX,
538         .fifo_size =            0,
539 };
540 
541 static int dummy_pcm_hw_params(struct snd_pcm_substream *substream,
542                                struct snd_pcm_hw_params *hw_params)
543 {
544         if (fake_buffer) {
545                 /* runtime->dma_bytes has to be set manually to allow mmap */
546                 substream->runtime->dma_bytes = params_buffer_bytes(hw_params);
547                 return 0;
548         }
549         return snd_pcm_lib_malloc_pages(substream,
550                                         params_buffer_bytes(hw_params));
551 }
552 
553 static int dummy_pcm_hw_free(struct snd_pcm_substream *substream)
554 {
555         if (fake_buffer)
556                 return 0;
557         return snd_pcm_lib_free_pages(substream);
558 }
559 
560 static int dummy_pcm_open(struct snd_pcm_substream *substream)
561 {
562         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
563         struct dummy_model *model = dummy->model;
564         struct snd_pcm_runtime *runtime = substream->runtime;
565         const struct dummy_timer_ops *ops;
566         int err;
567 
568         ops = &dummy_systimer_ops;
569 #ifdef CONFIG_HIGH_RES_TIMERS
570         if (hrtimer)
571                 ops = &dummy_hrtimer_ops;
572 #endif
573 
574         err = ops->create(substream);
575         if (err < 0)
576                 return err;
577         get_dummy_ops(substream) = ops;
578 
579         runtime->hw = dummy->pcm_hw;
580         if (substream->pcm->device & 1) {
581                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
582                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
583         }
584         if (substream->pcm->device & 2)
585                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP |
586                                       SNDRV_PCM_INFO_MMAP_VALID);
587 
588         if (model == NULL)
589                 return 0;
590 
591         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
592                 if (model->playback_constraints)
593                         err = model->playback_constraints(substream->runtime);
594         } else {
595                 if (model->capture_constraints)
596                         err = model->capture_constraints(substream->runtime);
597         }
598         if (err < 0) {
599                 get_dummy_ops(substream)->free(substream);
600                 return err;
601         }
602         return 0;
603 }
604 
605 static int dummy_pcm_close(struct snd_pcm_substream *substream)
606 {
607         get_dummy_ops(substream)->free(substream);
608         return 0;
609 }
610 
611 /*
612  * dummy buffer handling
613  */
614 
615 static void *dummy_page[2];
616 
617 static void free_fake_buffer(void)
618 {
619         if (fake_buffer) {
620                 int i;
621                 for (i = 0; i < 2; i++)
622                         if (dummy_page[i]) {
623                                 free_page((unsigned long)dummy_page[i]);
624                                 dummy_page[i] = NULL;
625                         }
626         }
627 }
628 
629 static int alloc_fake_buffer(void)
630 {
631         int i;
632 
633         if (!fake_buffer)
634                 return 0;
635         for (i = 0; i < 2; i++) {
636                 dummy_page[i] = (void *)get_zeroed_page(GFP_KERNEL);
637                 if (!dummy_page[i]) {
638                         free_fake_buffer();
639                         return -ENOMEM;
640                 }
641         }
642         return 0;
643 }
644 
645 static int dummy_pcm_copy(struct snd_pcm_substream *substream,
646                           int channel, snd_pcm_uframes_t pos,
647                           void __user *dst, snd_pcm_uframes_t count)
648 {
649         return 0; /* do nothing */
650 }
651 
652 static int dummy_pcm_silence(struct snd_pcm_substream *substream,
653                              int channel, snd_pcm_uframes_t pos,
654                              snd_pcm_uframes_t count)
655 {
656         return 0; /* do nothing */
657 }
658 
659 static struct page *dummy_pcm_page(struct snd_pcm_substream *substream,
660                                    unsigned long offset)
661 {
662         return virt_to_page(dummy_page[substream->stream]); /* the same page */
663 }
664 
665 static struct snd_pcm_ops dummy_pcm_ops = {
666         .open =         dummy_pcm_open,
667         .close =        dummy_pcm_close,
668         .ioctl =        snd_pcm_lib_ioctl,
669         .hw_params =    dummy_pcm_hw_params,
670         .hw_free =      dummy_pcm_hw_free,
671         .prepare =      dummy_pcm_prepare,
672         .trigger =      dummy_pcm_trigger,
673         .pointer =      dummy_pcm_pointer,
674 };
675 
676 static struct snd_pcm_ops dummy_pcm_ops_no_buf = {
677         .open =         dummy_pcm_open,
678         .close =        dummy_pcm_close,
679         .ioctl =        snd_pcm_lib_ioctl,
680         .hw_params =    dummy_pcm_hw_params,
681         .hw_free =      dummy_pcm_hw_free,
682         .prepare =      dummy_pcm_prepare,
683         .trigger =      dummy_pcm_trigger,
684         .pointer =      dummy_pcm_pointer,
685         .copy =         dummy_pcm_copy,
686         .silence =      dummy_pcm_silence,
687         .page =         dummy_pcm_page,
688 };
689 
690 static int snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
691                               int substreams)
692 {
693         struct snd_pcm *pcm;
694         struct snd_pcm_ops *ops;
695         int err;
696 
697         err = snd_pcm_new(dummy->card, "Dummy PCM", device,
698                                substreams, substreams, &pcm);
699         if (err < 0)
700                 return err;
701         dummy->pcm = pcm;
702         if (fake_buffer)
703                 ops = &dummy_pcm_ops_no_buf;
704         else
705                 ops = &dummy_pcm_ops;
706         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, ops);
707         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, ops);
708         pcm->private_data = dummy;
709         pcm->info_flags = 0;
710         strcpy(pcm->name, "Dummy PCM");
711         if (!fake_buffer) {
712                 snd_pcm_lib_preallocate_pages_for_all(pcm,
713                         SNDRV_DMA_TYPE_CONTINUOUS,
714                         snd_dma_continuous_data(GFP_KERNEL),
715                         0, 64*1024);
716         }
717         return 0;
718 }
719 
720 /*
721  * mixer interface
722  */
723 
724 #define DUMMY_VOLUME(xname, xindex, addr) \
725 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
726   .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
727   .name = xname, .index = xindex, \
728   .info = snd_dummy_volume_info, \
729   .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
730   .private_value = addr, \
731   .tlv = { .p = db_scale_dummy } }
732 
733 static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
734                                  struct snd_ctl_elem_info *uinfo)
735 {
736         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
737         uinfo->count = 2;
738         uinfo->value.integer.min = -50;
739         uinfo->value.integer.max = 100;
740         return 0;
741 }
742  
743 static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
744                                 struct snd_ctl_elem_value *ucontrol)
745 {
746         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
747         int addr = kcontrol->private_value;
748 
749         spin_lock_irq(&dummy->mixer_lock);
750         ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
751         ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
752         spin_unlock_irq(&dummy->mixer_lock);
753         return 0;
754 }
755 
756 static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
757                                 struct snd_ctl_elem_value *ucontrol)
758 {
759         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
760         int change, addr = kcontrol->private_value;
761         int left, right;
762 
763         left = ucontrol->value.integer.value[0];
764         if (left < -50)
765                 left = -50;
766         if (left > 100)
767                 left = 100;
768         right = ucontrol->value.integer.value[1];
769         if (right < -50)
770                 right = -50;
771         if (right > 100)
772                 right = 100;
773         spin_lock_irq(&dummy->mixer_lock);
774         change = dummy->mixer_volume[addr][0] != left ||
775                  dummy->mixer_volume[addr][1] != right;
776         dummy->mixer_volume[addr][0] = left;
777         dummy->mixer_volume[addr][1] = right;
778         spin_unlock_irq(&dummy->mixer_lock);
779         return change;
780 }
781 
782 static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0);
783 
784 #define DUMMY_CAPSRC(xname, xindex, addr) \
785 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
786   .info = snd_dummy_capsrc_info, \
787   .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
788   .private_value = addr }
789 
790 #define snd_dummy_capsrc_info   snd_ctl_boolean_stereo_info
791  
792 static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
793                                 struct snd_ctl_elem_value *ucontrol)
794 {
795         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
796         int addr = kcontrol->private_value;
797 
798         spin_lock_irq(&dummy->mixer_lock);
799         ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
800         ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
801         spin_unlock_irq(&dummy->mixer_lock);
802         return 0;
803 }
804 
805 static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
806 {
807         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
808         int change, addr = kcontrol->private_value;
809         int left, right;
810 
811         left = ucontrol->value.integer.value[0] & 1;
812         right = ucontrol->value.integer.value[1] & 1;
813         spin_lock_irq(&dummy->mixer_lock);
814         change = dummy->capture_source[addr][0] != left &&
815                  dummy->capture_source[addr][1] != right;
816         dummy->capture_source[addr][0] = left;
817         dummy->capture_source[addr][1] = right;
818         spin_unlock_irq(&dummy->mixer_lock);
819         return change;
820 }
821 
822 static int snd_dummy_iobox_info(struct snd_kcontrol *kcontrol,
823                                 struct snd_ctl_elem_info *info)
824 {
825         const char *const names[] = { "None", "CD Player" };
826 
827         return snd_ctl_enum_info(info, 1, 2, names);
828 }
829 
830 static int snd_dummy_iobox_get(struct snd_kcontrol *kcontrol,
831                                struct snd_ctl_elem_value *value)
832 {
833         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
834 
835         value->value.enumerated.item[0] = dummy->iobox;
836         return 0;
837 }
838 
839 static int snd_dummy_iobox_put(struct snd_kcontrol *kcontrol,
840                                struct snd_ctl_elem_value *value)
841 {
842         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
843         int changed;
844 
845         if (value->value.enumerated.item[0] > 1)
846                 return -EINVAL;
847 
848         changed = value->value.enumerated.item[0] != dummy->iobox;
849         if (changed) {
850                 dummy->iobox = value->value.enumerated.item[0];
851 
852                 if (dummy->iobox) {
853                         dummy->cd_volume_ctl->vd[0].access &=
854                                 ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
855                         dummy->cd_switch_ctl->vd[0].access &=
856                                 ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
857                 } else {
858                         dummy->cd_volume_ctl->vd[0].access |=
859                                 SNDRV_CTL_ELEM_ACCESS_INACTIVE;
860                         dummy->cd_switch_ctl->vd[0].access |=
861                                 SNDRV_CTL_ELEM_ACCESS_INACTIVE;
862                 }
863 
864                 snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,
865                                &dummy->cd_volume_ctl->id);
866                 snd_ctl_notify(dummy->card, SNDRV_CTL_EVENT_MASK_INFO,
867                                &dummy->cd_switch_ctl->id);
868         }
869 
870         return changed;
871 }
872 
873 static struct snd_kcontrol_new snd_dummy_controls[] = {
874 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
875 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
876 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
877 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH),
878 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
879 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE),
880 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
881 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC),
882 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
883 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD),
884 {
885         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
886         .name  = "External I/O Box",
887         .info  = snd_dummy_iobox_info,
888         .get   = snd_dummy_iobox_get,
889         .put   = snd_dummy_iobox_put,
890 },
891 };
892 
893 static int snd_card_dummy_new_mixer(struct snd_dummy *dummy)
894 {
895         struct snd_card *card = dummy->card;
896         struct snd_kcontrol *kcontrol;
897         unsigned int idx;
898         int err;
899 
900         spin_lock_init(&dummy->mixer_lock);
901         strcpy(card->mixername, "Dummy Mixer");
902         dummy->iobox = 1;
903 
904         for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
905                 kcontrol = snd_ctl_new1(&snd_dummy_controls[idx], dummy);
906                 err = snd_ctl_add(card, kcontrol);
907                 if (err < 0)
908                         return err;
909                 if (!strcmp(kcontrol->id.name, "CD Volume"))
910                         dummy->cd_volume_ctl = kcontrol;
911                 else if (!strcmp(kcontrol->id.name, "CD Capture Switch"))
912                         dummy->cd_switch_ctl = kcontrol;
913 
914         }
915         return 0;
916 }
917 
918 #if defined(CONFIG_SND_DEBUG) && defined(CONFIG_SND_PROC_FS)
919 /*
920  * proc interface
921  */
922 static void print_formats(struct snd_dummy *dummy,
923                           struct snd_info_buffer *buffer)
924 {
925         int i;
926 
927         for (i = 0; i < SNDRV_PCM_FORMAT_LAST; i++) {
928                 if (dummy->pcm_hw.formats & (1ULL << i))
929                         snd_iprintf(buffer, " %s", snd_pcm_format_name(i));
930         }
931 }
932 
933 static void print_rates(struct snd_dummy *dummy,
934                         struct snd_info_buffer *buffer)
935 {
936         static int rates[] = {
937                 5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000,
938                 64000, 88200, 96000, 176400, 192000,
939         };
940         int i;
941 
942         if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_CONTINUOUS)
943                 snd_iprintf(buffer, " continuous");
944         if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_KNOT)
945                 snd_iprintf(buffer, " knot");
946         for (i = 0; i < ARRAY_SIZE(rates); i++)
947                 if (dummy->pcm_hw.rates & (1 << i))
948                         snd_iprintf(buffer, " %d", rates[i]);
949 }
950 
951 #define get_dummy_int_ptr(dummy, ofs) \
952         (unsigned int *)((char *)&((dummy)->pcm_hw) + (ofs))
953 #define get_dummy_ll_ptr(dummy, ofs) \
954         (unsigned long long *)((char *)&((dummy)->pcm_hw) + (ofs))
955 
956 struct dummy_hw_field {
957         const char *name;
958         const char *format;
959         unsigned int offset;
960         unsigned int size;
961 };
962 #define FIELD_ENTRY(item, fmt) {                   \
963         .name = #item,                             \
964         .format = fmt,                             \
965         .offset = offsetof(struct snd_pcm_hardware, item), \
966         .size = sizeof(dummy_pcm_hardware.item) }
967 
968 static struct dummy_hw_field fields[] = {
969         FIELD_ENTRY(formats, "%#llx"),
970         FIELD_ENTRY(rates, "%#x"),
971         FIELD_ENTRY(rate_min, "%d"),
972         FIELD_ENTRY(rate_max, "%d"),
973         FIELD_ENTRY(channels_min, "%d"),
974         FIELD_ENTRY(channels_max, "%d"),
975         FIELD_ENTRY(buffer_bytes_max, "%ld"),
976         FIELD_ENTRY(period_bytes_min, "%ld"),
977         FIELD_ENTRY(period_bytes_max, "%ld"),
978         FIELD_ENTRY(periods_min, "%d"),
979         FIELD_ENTRY(periods_max, "%d"),
980 };
981 
982 static void dummy_proc_read(struct snd_info_entry *entry,
983                             struct snd_info_buffer *buffer)
984 {
985         struct snd_dummy *dummy = entry->private_data;
986         int i;
987 
988         for (i = 0; i < ARRAY_SIZE(fields); i++) {
989                 snd_iprintf(buffer, "%s ", fields[i].name);
990                 if (fields[i].size == sizeof(int))
991                         snd_iprintf(buffer, fields[i].format,
992                                 *get_dummy_int_ptr(dummy, fields[i].offset));
993                 else
994                         snd_iprintf(buffer, fields[i].format,
995                                 *get_dummy_ll_ptr(dummy, fields[i].offset));
996                 if (!strcmp(fields[i].name, "formats"))
997                         print_formats(dummy, buffer);
998                 else if (!strcmp(fields[i].name, "rates"))
999                         print_rates(dummy, buffer);
1000                 snd_iprintf(buffer, "\n");
1001         }
1002 }
1003 
1004 static void dummy_proc_write(struct snd_info_entry *entry,
1005                              struct snd_info_buffer *buffer)
1006 {
1007         struct snd_dummy *dummy = entry->private_data;
1008         char line[64];
1009 
1010         while (!snd_info_get_line(buffer, line, sizeof(line))) {
1011                 char item[20];
1012                 const char *ptr;
1013                 unsigned long long val;
1014                 int i;
1015 
1016                 ptr = snd_info_get_str(item, line, sizeof(item));
1017                 for (i = 0; i < ARRAY_SIZE(fields); i++) {
1018                         if (!strcmp(item, fields[i].name))
1019                                 break;
1020                 }
1021                 if (i >= ARRAY_SIZE(fields))
1022                         continue;
1023                 snd_info_get_str(item, ptr, sizeof(item));
1024                 if (kstrtoull(item, 0, &val))
1025                         continue;
1026                 if (fields[i].size == sizeof(int))
1027                         *get_dummy_int_ptr(dummy, fields[i].offset) = val;
1028                 else
1029                         *get_dummy_ll_ptr(dummy, fields[i].offset) = val;
1030         }
1031 }
1032 
1033 static void dummy_proc_init(struct snd_dummy *chip)
1034 {
1035         struct snd_info_entry *entry;
1036 
1037         if (!snd_card_proc_new(chip->card, "dummy_pcm", &entry)) {
1038                 snd_info_set_text_ops(entry, chip, dummy_proc_read);
1039                 entry->c.text.write = dummy_proc_write;
1040                 entry->mode |= S_IWUSR;
1041                 entry->private_data = chip;
1042         }
1043 }
1044 #else
1045 #define dummy_proc_init(x)
1046 #endif /* CONFIG_SND_DEBUG && CONFIG_SND_PROC_FS */
1047 
1048 static int snd_dummy_probe(struct platform_device *devptr)
1049 {
1050         struct snd_card *card;
1051         struct snd_dummy *dummy;
1052         struct dummy_model *m = NULL, **mdl;
1053         int idx, err;
1054         int dev = devptr->id;
1055 
1056         err = snd_card_new(&devptr->dev, index[dev], id[dev], THIS_MODULE,
1057                            sizeof(struct snd_dummy), &card);
1058         if (err < 0)
1059                 return err;
1060         dummy = card->private_data;
1061         dummy->card = card;
1062         for (mdl = dummy_models; *mdl && model[dev]; mdl++) {
1063                 if (strcmp(model[dev], (*mdl)->name) == 0) {
1064                         printk(KERN_INFO
1065                                 "snd-dummy: Using model '%s' for card %i\n",
1066                                 (*mdl)->name, card->number);
1067                         m = dummy->model = *mdl;
1068                         break;
1069                 }
1070         }
1071         for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
1072                 if (pcm_substreams[dev] < 1)
1073                         pcm_substreams[dev] = 1;
1074                 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
1075                         pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
1076                 err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev]);
1077                 if (err < 0)
1078                         goto __nodev;
1079         }
1080 
1081         dummy->pcm_hw = dummy_pcm_hardware;
1082         if (m) {
1083                 if (m->formats)
1084                         dummy->pcm_hw.formats = m->formats;
1085                 if (m->buffer_bytes_max)
1086                         dummy->pcm_hw.buffer_bytes_max = m->buffer_bytes_max;
1087                 if (m->period_bytes_min)
1088                         dummy->pcm_hw.period_bytes_min = m->period_bytes_min;
1089                 if (m->period_bytes_max)
1090                         dummy->pcm_hw.period_bytes_max = m->period_bytes_max;
1091                 if (m->periods_min)
1092                         dummy->pcm_hw.periods_min = m->periods_min;
1093                 if (m->periods_max)
1094                         dummy->pcm_hw.periods_max = m->periods_max;
1095                 if (m->rates)
1096                         dummy->pcm_hw.rates = m->rates;
1097                 if (m->rate_min)
1098                         dummy->pcm_hw.rate_min = m->rate_min;
1099                 if (m->rate_max)
1100                         dummy->pcm_hw.rate_max = m->rate_max;
1101                 if (m->channels_min)
1102                         dummy->pcm_hw.channels_min = m->channels_min;
1103                 if (m->channels_max)
1104                         dummy->pcm_hw.channels_max = m->channels_max;
1105         }
1106 
1107         err = snd_card_dummy_new_mixer(dummy);
1108         if (err < 0)
1109                 goto __nodev;
1110         strcpy(card->driver, "Dummy");
1111         strcpy(card->shortname, "Dummy");
1112         sprintf(card->longname, "Dummy %i", dev + 1);
1113 
1114         dummy_proc_init(dummy);
1115 
1116         err = snd_card_register(card);
1117         if (err == 0) {
1118                 platform_set_drvdata(devptr, card);
1119                 return 0;
1120         }
1121       __nodev:
1122         snd_card_free(card);
1123         return err;
1124 }
1125 
1126 static int snd_dummy_remove(struct platform_device *devptr)
1127 {
1128         snd_card_free(platform_get_drvdata(devptr));
1129         return 0;
1130 }
1131 
1132 #ifdef CONFIG_PM_SLEEP
1133 static int snd_dummy_suspend(struct device *pdev)
1134 {
1135         struct snd_card *card = dev_get_drvdata(pdev);
1136         struct snd_dummy *dummy = card->private_data;
1137 
1138         snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
1139         snd_pcm_suspend_all(dummy->pcm);
1140         return 0;
1141 }
1142         
1143 static int snd_dummy_resume(struct device *pdev)
1144 {
1145         struct snd_card *card = dev_get_drvdata(pdev);
1146 
1147         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
1148         return 0;
1149 }
1150 
1151 static SIMPLE_DEV_PM_OPS(snd_dummy_pm, snd_dummy_suspend, snd_dummy_resume);
1152 #define SND_DUMMY_PM_OPS        &snd_dummy_pm
1153 #else
1154 #define SND_DUMMY_PM_OPS        NULL
1155 #endif
1156 
1157 #define SND_DUMMY_DRIVER        "snd_dummy"
1158 
1159 static struct platform_driver snd_dummy_driver = {
1160         .probe          = snd_dummy_probe,
1161         .remove         = snd_dummy_remove,
1162         .driver         = {
1163                 .name   = SND_DUMMY_DRIVER,
1164                 .pm     = SND_DUMMY_PM_OPS,
1165         },
1166 };
1167 
1168 static void snd_dummy_unregister_all(void)
1169 {
1170         int i;
1171 
1172         for (i = 0; i < ARRAY_SIZE(devices); ++i)
1173                 platform_device_unregister(devices[i]);
1174         platform_driver_unregister(&snd_dummy_driver);
1175         free_fake_buffer();
1176 }
1177 
1178 static int __init alsa_card_dummy_init(void)
1179 {
1180         int i, cards, err;
1181 
1182         err = platform_driver_register(&snd_dummy_driver);
1183         if (err < 0)
1184                 return err;
1185 
1186         err = alloc_fake_buffer();
1187         if (err < 0) {
1188                 platform_driver_unregister(&snd_dummy_driver);
1189                 return err;
1190         }
1191 
1192         cards = 0;
1193         for (i = 0; i < SNDRV_CARDS; i++) {
1194                 struct platform_device *device;
1195                 if (! enable[i])
1196                         continue;
1197                 device = platform_device_register_simple(SND_DUMMY_DRIVER,
1198                                                          i, NULL, 0);
1199                 if (IS_ERR(device))
1200                         continue;
1201                 if (!platform_get_drvdata(device)) {
1202                         platform_device_unregister(device);
1203                         continue;
1204                 }
1205                 devices[i] = device;
1206                 cards++;
1207         }
1208         if (!cards) {
1209 #ifdef MODULE
1210                 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
1211 #endif
1212                 snd_dummy_unregister_all();
1213                 return -ENODEV;
1214         }
1215         return 0;
1216 }
1217 
1218 static void __exit alsa_card_dummy_exit(void)
1219 {
1220         snd_dummy_unregister_all();
1221 }
1222 
1223 module_init(alsa_card_dummy_init)
1224 module_exit(alsa_card_dummy_exit)
1225 

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