Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 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

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

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