Version:  2.0.40 2.2.26 2.4.37 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0

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

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