f387d53e50397526d70b8a7409916dcabfdd924a
[linux-2.6.git] / 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/moduleparam.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/initval.h>
37
38 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
39 MODULE_DESCRIPTION("Dummy soundcard (/dev/null)");
40 MODULE_LICENSE("GPL");
41 MODULE_SUPPORTED_DEVICE("{{ALSA,Dummy soundcard}}");
42
43 #define MAX_PCM_DEVICES         4
44 #define MAX_PCM_SUBSTREAMS      16
45 #define MAX_MIDI_DEVICES        2
46
47 #if 0 /* emu10k1 emulation */
48 #define MAX_BUFFER_SIZE         (128 * 1024)
49 static int emu10k1_playback_constraints(struct snd_pcm_runtime *runtime)
50 {
51         int err;
52         err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
53         if (err < 0)
54                 return err;
55         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256, UINT_MAX);
56         if (err < 0)
57                 return err;
58         return 0;
59 }
60 #define add_playback_constraints emu10k1_playback_constraints
61 #endif
62
63 #if 0 /* RME9652 emulation */
64 #define MAX_BUFFER_SIZE         (26 * 64 * 1024)
65 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S32_LE
66 #define USE_CHANNELS_MIN        26
67 #define USE_CHANNELS_MAX        26
68 #define USE_PERIODS_MIN         2
69 #define USE_PERIODS_MAX         2
70 #endif
71
72 #if 0 /* ICE1712 emulation */
73 #define MAX_BUFFER_SIZE         (256 * 1024)
74 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S32_LE
75 #define USE_CHANNELS_MIN        10
76 #define USE_CHANNELS_MAX        10
77 #define USE_PERIODS_MIN         1
78 #define USE_PERIODS_MAX         1024
79 #endif
80
81 #if 0 /* UDA1341 emulation */
82 #define MAX_BUFFER_SIZE         (16380)
83 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S16_LE
84 #define USE_CHANNELS_MIN        2
85 #define USE_CHANNELS_MAX        2
86 #define USE_PERIODS_MIN         2
87 #define USE_PERIODS_MAX         255
88 #endif
89
90 #if 0 /* simple AC97 bridge (intel8x0) with 48kHz AC97 only codec */
91 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S16_LE
92 #define USE_CHANNELS_MIN        2
93 #define USE_CHANNELS_MAX        2
94 #define USE_RATE                SNDRV_PCM_RATE_48000
95 #define USE_RATE_MIN            48000
96 #define USE_RATE_MAX            48000
97 #endif
98
99 #if 0 /* CA0106 */
100 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S16_LE
101 #define USE_CHANNELS_MIN        2
102 #define USE_CHANNELS_MAX        2
103 #define USE_RATE                (SNDRV_PCM_RATE_48000|SNDRV_PCM_RATE_96000|SNDRV_PCM_RATE_192000) 
104 #define USE_RATE_MIN            48000 
105 #define USE_RATE_MAX            192000
106 #define MAX_BUFFER_SIZE         ((65536-64)*8)
107 #define MAX_PERIOD_SIZE         (65536-64)
108 #define USE_PERIODS_MIN         2
109 #define USE_PERIODS_MAX         8
110 #endif
111
112
113 /* defaults */
114 #ifndef MAX_BUFFER_SIZE
115 #define MAX_BUFFER_SIZE         (64*1024)
116 #endif
117 #ifndef MAX_PERIOD_SIZE
118 #define MAX_PERIOD_SIZE         MAX_BUFFER_SIZE
119 #endif
120 #ifndef USE_FORMATS
121 #define USE_FORMATS             (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE)
122 #endif
123 #ifndef USE_RATE
124 #define USE_RATE                SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000
125 #define USE_RATE_MIN            5500
126 #define USE_RATE_MAX            48000
127 #endif
128 #ifndef USE_CHANNELS_MIN
129 #define USE_CHANNELS_MIN        1
130 #endif
131 #ifndef USE_CHANNELS_MAX
132 #define USE_CHANNELS_MAX        2
133 #endif
134 #ifndef USE_PERIODS_MIN
135 #define USE_PERIODS_MIN         1
136 #endif
137 #ifndef USE_PERIODS_MAX
138 #define USE_PERIODS_MAX         1024
139 #endif
140 #ifndef add_playback_constraints
141 #define add_playback_constraints(x) 0
142 #endif
143 #ifndef add_capture_constraints
144 #define add_capture_constraints(x) 0
145 #endif
146
147 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
148 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
149 static int enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
150 static int pcm_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
151 static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8};
152 //static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 2};
153 #ifdef CONFIG_HIGH_RES_TIMERS
154 static int hrtimer = 1;
155 #endif
156
157 module_param_array(index, int, NULL, 0444);
158 MODULE_PARM_DESC(index, "Index value for dummy soundcard.");
159 module_param_array(id, charp, NULL, 0444);
160 MODULE_PARM_DESC(id, "ID string for dummy soundcard.");
161 module_param_array(enable, bool, NULL, 0444);
162 MODULE_PARM_DESC(enable, "Enable this dummy soundcard.");
163 module_param_array(pcm_devs, int, NULL, 0444);
164 MODULE_PARM_DESC(pcm_devs, "PCM devices # (0-4) for dummy driver.");
165 module_param_array(pcm_substreams, int, NULL, 0444);
166 MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-16) for dummy driver.");
167 //module_param_array(midi_devs, int, NULL, 0444);
168 //MODULE_PARM_DESC(midi_devs, "MIDI devices # (0-2) for dummy driver.");
169 #ifdef CONFIG_HIGH_RES_TIMERS
170 module_param(hrtimer, bool, 0644);
171 MODULE_PARM_DESC(hrtimer, "Use hrtimer as the timer source.");
172 #endif
173
174 static struct platform_device *devices[SNDRV_CARDS];
175
176 #define MIXER_ADDR_MASTER       0
177 #define MIXER_ADDR_LINE         1
178 #define MIXER_ADDR_MIC          2
179 #define MIXER_ADDR_SYNTH        3
180 #define MIXER_ADDR_CD           4
181 #define MIXER_ADDR_LAST         4
182
183 struct dummy_timer_ops {
184         int (*create)(struct snd_pcm_substream *);
185         void (*free)(struct snd_pcm_substream *);
186         int (*prepare)(struct snd_pcm_substream *);
187         int (*start)(struct snd_pcm_substream *);
188         int (*stop)(struct snd_pcm_substream *);
189         snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *);
190 };
191
192 struct snd_dummy {
193         struct snd_card *card;
194         struct snd_pcm *pcm;
195         spinlock_t mixer_lock;
196         int mixer_volume[MIXER_ADDR_LAST+1][2];
197         int capture_source[MIXER_ADDR_LAST+1][2];
198         const struct dummy_timer_ops *timer_ops;
199 };
200
201 /*
202  * system timer interface
203  */
204
205 struct dummy_systimer_pcm {
206         spinlock_t lock;
207         struct timer_list timer;
208         unsigned int pcm_buffer_size;
209         unsigned int pcm_period_size;
210         unsigned int pcm_bps;           /* bytes per second */
211         unsigned int pcm_hz;            /* HZ */
212         unsigned int pcm_irq_pos;       /* IRQ position */
213         unsigned int pcm_buf_pos;       /* position in buffer */
214         struct snd_pcm_substream *substream;
215 };
216
217 static int dummy_systimer_start(struct snd_pcm_substream *substream)
218 {
219         struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
220         spin_lock(&dpcm->lock);
221         dpcm->timer.expires = 1 + jiffies;
222         add_timer(&dpcm->timer);
223         spin_unlock(&dpcm->lock);
224         return 0;
225 }
226
227 static int dummy_systimer_stop(struct snd_pcm_substream *substream)
228 {
229         struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
230         spin_lock(&dpcm->lock);
231         del_timer(&dpcm->timer);
232         spin_unlock(&dpcm->lock);
233         return 0;
234 }
235
236 static int dummy_systimer_prepare(struct snd_pcm_substream *substream)
237 {
238         struct snd_pcm_runtime *runtime = substream->runtime;
239         struct dummy_systimer_pcm *dpcm = runtime->private_data;
240         int bps;
241
242         bps = snd_pcm_format_width(runtime->format) * runtime->rate *
243                 runtime->channels / 8;
244
245         if (bps <= 0)
246                 return -EINVAL;
247
248         dpcm->pcm_bps = bps;
249         dpcm->pcm_hz = HZ;
250         dpcm->pcm_buffer_size = snd_pcm_lib_buffer_bytes(substream);
251         dpcm->pcm_period_size = snd_pcm_lib_period_bytes(substream);
252         dpcm->pcm_irq_pos = 0;
253         dpcm->pcm_buf_pos = 0;
254
255         return 0;
256 }
257
258 static void dummy_systimer_callback(unsigned long data)
259 {
260         struct dummy_systimer_pcm *dpcm = (struct dummy_systimer_pcm *)data;
261         unsigned long flags;
262         
263         spin_lock_irqsave(&dpcm->lock, flags);
264         dpcm->timer.expires = 1 + jiffies;
265         add_timer(&dpcm->timer);
266         dpcm->pcm_irq_pos += dpcm->pcm_bps;
267         dpcm->pcm_buf_pos += dpcm->pcm_bps;
268         dpcm->pcm_buf_pos %= dpcm->pcm_buffer_size * dpcm->pcm_hz;
269         if (dpcm->pcm_irq_pos >= dpcm->pcm_period_size * dpcm->pcm_hz) {
270                 dpcm->pcm_irq_pos %= dpcm->pcm_period_size * dpcm->pcm_hz;
271                 spin_unlock_irqrestore(&dpcm->lock, flags);
272                 snd_pcm_period_elapsed(dpcm->substream);
273         } else
274                 spin_unlock_irqrestore(&dpcm->lock, flags);
275 }
276
277 static snd_pcm_uframes_t
278 dummy_systimer_pointer(struct snd_pcm_substream *substream)
279 {
280         struct snd_pcm_runtime *runtime = substream->runtime;
281         struct dummy_systimer_pcm *dpcm = runtime->private_data;
282
283         return bytes_to_frames(runtime, dpcm->pcm_buf_pos / dpcm->pcm_hz);
284 }
285
286 static int dummy_systimer_create(struct snd_pcm_substream *substream)
287 {
288         struct dummy_systimer_pcm *dpcm;
289
290         dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
291         if (!dpcm)
292                 return -ENOMEM;
293         substream->runtime->private_data = dpcm;
294         init_timer(&dpcm->timer);
295         dpcm->timer.data = (unsigned long) dpcm;
296         dpcm->timer.function = dummy_systimer_callback;
297         spin_lock_init(&dpcm->lock);
298         dpcm->substream = substream;
299         return 0;
300 }
301
302 static void dummy_systimer_free(struct snd_pcm_substream *substream)
303 {
304         kfree(substream->runtime->private_data);
305 }
306
307 static struct dummy_timer_ops dummy_systimer_ops = {
308         .create =       dummy_systimer_create,
309         .free =         dummy_systimer_free,
310         .prepare =      dummy_systimer_prepare,
311         .start =        dummy_systimer_start,
312         .stop =         dummy_systimer_stop,
313         .pointer =      dummy_systimer_pointer,
314 };
315
316 #ifdef CONFIG_HIGH_RES_TIMERS
317 /*
318  * hrtimer interface
319  */
320
321 struct dummy_hrtimer_pcm {
322         ktime_t base_time;
323         ktime_t period_time;
324         atomic_t running;
325         struct hrtimer timer;
326         struct tasklet_struct tasklet;
327         struct snd_pcm_substream *substream;
328 };
329
330 static void dummy_hrtimer_pcm_elapsed(unsigned long priv)
331 {
332         struct dummy_hrtimer_pcm *dpcm = (struct dummy_hrtimer_pcm *)priv;
333         if (atomic_read(&dpcm->running))
334                 snd_pcm_period_elapsed(dpcm->substream);
335 }
336
337 static enum hrtimer_restart dummy_hrtimer_callback(struct hrtimer *timer)
338 {
339         struct dummy_hrtimer_pcm *dpcm;
340
341         dpcm = container_of(timer, struct dummy_hrtimer_pcm, timer);
342         if (!atomic_read(&dpcm->running))
343                 return HRTIMER_NORESTART;
344         tasklet_schedule(&dpcm->tasklet);
345         hrtimer_forward_now(timer, dpcm->period_time);
346         return HRTIMER_RESTART;
347 }
348
349 static int dummy_hrtimer_start(struct snd_pcm_substream *substream)
350 {
351         struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
352
353         dpcm->base_time = hrtimer_cb_get_time(&dpcm->timer);
354         hrtimer_start(&dpcm->timer, dpcm->period_time, HRTIMER_MODE_REL);
355         atomic_set(&dpcm->running, 1);
356         return 0;
357 }
358
359 static int dummy_hrtimer_stop(struct snd_pcm_substream *substream)
360 {
361         struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
362
363         atomic_set(&dpcm->running, 0);
364         hrtimer_cancel(&dpcm->timer);
365         return 0;
366 }
367
368 static inline void dummy_hrtimer_sync(struct dummy_hrtimer_pcm *dpcm)
369 {
370         tasklet_kill(&dpcm->tasklet);
371 }
372
373 static snd_pcm_uframes_t
374 dummy_hrtimer_pointer(struct snd_pcm_substream *substream)
375 {
376         struct snd_pcm_runtime *runtime = substream->runtime;
377         struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
378         u64 delta;
379         u32 pos;
380
381         delta = ktime_us_delta(hrtimer_cb_get_time(&dpcm->timer),
382                                dpcm->base_time);
383         delta = div_u64(delta * runtime->rate + 999999, 1000000);
384         div_u64_rem(delta, runtime->buffer_size, &pos);
385         return pos;
386 }
387
388 static int dummy_hrtimer_prepare(struct snd_pcm_substream *substream)
389 {
390         struct snd_pcm_runtime *runtime = substream->runtime;
391         struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
392         unsigned int period, rate;
393         long sec;
394         unsigned long nsecs;
395
396         dummy_hrtimer_sync(dpcm);
397         period = runtime->period_size;
398         rate = runtime->rate;
399         sec = period / rate;
400         period %= rate;
401         nsecs = div_u64((u64)period * 1000000000UL + rate - 1, rate);
402         dpcm->period_time = ktime_set(sec, nsecs);
403
404         return 0;
405 }
406
407 static int dummy_hrtimer_create(struct snd_pcm_substream *substream)
408 {
409         struct dummy_hrtimer_pcm *dpcm;
410
411         dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
412         if (!dpcm)
413                 return -ENOMEM;
414         substream->runtime->private_data = dpcm;
415         hrtimer_init(&dpcm->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
416         dpcm->timer.function = dummy_hrtimer_callback;
417         dpcm->substream = substream;
418         atomic_set(&dpcm->running, 0);
419         tasklet_init(&dpcm->tasklet, dummy_hrtimer_pcm_elapsed,
420                      (unsigned long)dpcm);
421         return 0;
422 }
423
424 static void dummy_hrtimer_free(struct snd_pcm_substream *substream)
425 {
426         struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
427         dummy_hrtimer_sync(dpcm);
428         kfree(dpcm);
429 }
430
431 static struct dummy_timer_ops dummy_hrtimer_ops = {
432         .create =       dummy_hrtimer_create,
433         .free =         dummy_hrtimer_free,
434         .prepare =      dummy_hrtimer_prepare,
435         .start =        dummy_hrtimer_start,
436         .stop =         dummy_hrtimer_stop,
437         .pointer =      dummy_hrtimer_pointer,
438 };
439
440 #endif /* CONFIG_HIGH_RES_TIMERS */
441
442 /*
443  * PCM interface
444  */
445
446 static int dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
447 {
448         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
449
450         switch (cmd) {
451         case SNDRV_PCM_TRIGGER_START:
452         case SNDRV_PCM_TRIGGER_RESUME:
453                 return dummy->timer_ops->start(substream);
454         case SNDRV_PCM_TRIGGER_STOP:
455         case SNDRV_PCM_TRIGGER_SUSPEND:
456                 return dummy->timer_ops->stop(substream);
457         }
458         return -EINVAL;
459 }
460
461 static int dummy_pcm_prepare(struct snd_pcm_substream *substream)
462 {
463         struct snd_pcm_runtime *runtime = substream->runtime;
464         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
465
466         snd_pcm_format_set_silence(runtime->format, runtime->dma_area,
467                         bytes_to_samples(runtime, runtime->dma_bytes));
468         return dummy->timer_ops->prepare(substream);
469 }
470
471 static snd_pcm_uframes_t dummy_pcm_pointer(struct snd_pcm_substream *substream)
472 {
473         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
474
475         return dummy->timer_ops->pointer(substream);
476 }
477
478 static struct snd_pcm_hardware dummy_pcm_hardware = {
479         .info =                 (SNDRV_PCM_INFO_MMAP |
480                                  SNDRV_PCM_INFO_INTERLEAVED |
481                                  SNDRV_PCM_INFO_RESUME |
482                                  SNDRV_PCM_INFO_MMAP_VALID),
483         .formats =              USE_FORMATS,
484         .rates =                USE_RATE,
485         .rate_min =             USE_RATE_MIN,
486         .rate_max =             USE_RATE_MAX,
487         .channels_min =         USE_CHANNELS_MIN,
488         .channels_max =         USE_CHANNELS_MAX,
489         .buffer_bytes_max =     MAX_BUFFER_SIZE,
490         .period_bytes_min =     64,
491         .period_bytes_max =     MAX_PERIOD_SIZE,
492         .periods_min =          USE_PERIODS_MIN,
493         .periods_max =          USE_PERIODS_MAX,
494         .fifo_size =            0,
495 };
496
497 static int dummy_pcm_hw_params(struct snd_pcm_substream *substream,
498                                struct snd_pcm_hw_params *hw_params)
499 {
500         return snd_pcm_lib_malloc_pages(substream,
501                                         params_buffer_bytes(hw_params));
502 }
503
504 static int dummy_pcm_hw_free(struct snd_pcm_substream *substream)
505 {
506         return snd_pcm_lib_free_pages(substream);
507 }
508
509 static int dummy_pcm_open(struct snd_pcm_substream *substream)
510 {
511         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
512         struct snd_pcm_runtime *runtime = substream->runtime;
513         int err;
514
515         dummy->timer_ops = &dummy_systimer_ops;
516 #ifdef CONFIG_HIGH_RES_TIMERS
517         if (hrtimer)
518                 dummy->timer_ops = &dummy_hrtimer_ops;
519 #endif
520
521         err = dummy->timer_ops->create(substream);
522         if (err < 0)
523                 return err;
524
525         runtime->hw = dummy_pcm_hardware;
526         if (substream->pcm->device & 1) {
527                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
528                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
529         }
530         if (substream->pcm->device & 2)
531                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP |
532                                       SNDRV_PCM_INFO_MMAP_VALID);
533
534         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
535                 err = add_playback_constraints(substream->runtime);
536         else
537                 err = add_capture_constraints(substream->runtime);
538         if (err < 0) {
539                 dummy->timer_ops->free(substream);
540                 return err;
541         }
542         return 0;
543 }
544
545 static int dummy_pcm_close(struct snd_pcm_substream *substream)
546 {
547         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
548         dummy->timer_ops->free(substream);
549         return 0;
550 }
551
552 static struct snd_pcm_ops dummy_pcm_ops = {
553         .open =         dummy_pcm_open,
554         .close =        dummy_pcm_close,
555         .ioctl =        snd_pcm_lib_ioctl,
556         .hw_params =    dummy_pcm_hw_params,
557         .hw_free =      dummy_pcm_hw_free,
558         .prepare =      dummy_pcm_prepare,
559         .trigger =      dummy_pcm_trigger,
560         .pointer =      dummy_pcm_pointer,
561 };
562
563 static int __devinit snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
564                                         int substreams)
565 {
566         struct snd_pcm *pcm;
567         int err;
568
569         err = snd_pcm_new(dummy->card, "Dummy PCM", device,
570                                substreams, substreams, &pcm);
571         if (err < 0)
572                 return err;
573         dummy->pcm = pcm;
574         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &dummy_pcm_ops);
575         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &dummy_pcm_ops);
576         pcm->private_data = dummy;
577         pcm->info_flags = 0;
578         strcpy(pcm->name, "Dummy PCM");
579         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
580                                               snd_dma_continuous_data(GFP_KERNEL),
581                                               0, 64*1024);
582         return 0;
583 }
584
585 #define DUMMY_VOLUME(xname, xindex, addr) \
586 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
587   .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
588   .name = xname, .index = xindex, \
589   .info = snd_dummy_volume_info, \
590   .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
591   .private_value = addr, \
592   .tlv = { .p = db_scale_dummy } }
593
594 static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
595                                  struct snd_ctl_elem_info *uinfo)
596 {
597         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
598         uinfo->count = 2;
599         uinfo->value.integer.min = -50;
600         uinfo->value.integer.max = 100;
601         return 0;
602 }
603  
604 static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
605                                 struct snd_ctl_elem_value *ucontrol)
606 {
607         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
608         int addr = kcontrol->private_value;
609
610         spin_lock_irq(&dummy->mixer_lock);
611         ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
612         ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
613         spin_unlock_irq(&dummy->mixer_lock);
614         return 0;
615 }
616
617 static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
618                                 struct snd_ctl_elem_value *ucontrol)
619 {
620         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
621         int change, addr = kcontrol->private_value;
622         int left, right;
623
624         left = ucontrol->value.integer.value[0];
625         if (left < -50)
626                 left = -50;
627         if (left > 100)
628                 left = 100;
629         right = ucontrol->value.integer.value[1];
630         if (right < -50)
631                 right = -50;
632         if (right > 100)
633                 right = 100;
634         spin_lock_irq(&dummy->mixer_lock);
635         change = dummy->mixer_volume[addr][0] != left ||
636                  dummy->mixer_volume[addr][1] != right;
637         dummy->mixer_volume[addr][0] = left;
638         dummy->mixer_volume[addr][1] = right;
639         spin_unlock_irq(&dummy->mixer_lock);
640         return change;
641 }
642
643 static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0);
644
645 #define DUMMY_CAPSRC(xname, xindex, addr) \
646 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
647   .info = snd_dummy_capsrc_info, \
648   .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
649   .private_value = addr }
650
651 #define snd_dummy_capsrc_info   snd_ctl_boolean_stereo_info
652  
653 static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
654                                 struct snd_ctl_elem_value *ucontrol)
655 {
656         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
657         int addr = kcontrol->private_value;
658
659         spin_lock_irq(&dummy->mixer_lock);
660         ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
661         ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
662         spin_unlock_irq(&dummy->mixer_lock);
663         return 0;
664 }
665
666 static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
667 {
668         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
669         int change, addr = kcontrol->private_value;
670         int left, right;
671
672         left = ucontrol->value.integer.value[0] & 1;
673         right = ucontrol->value.integer.value[1] & 1;
674         spin_lock_irq(&dummy->mixer_lock);
675         change = dummy->capture_source[addr][0] != left &&
676                  dummy->capture_source[addr][1] != right;
677         dummy->capture_source[addr][0] = left;
678         dummy->capture_source[addr][1] = right;
679         spin_unlock_irq(&dummy->mixer_lock);
680         return change;
681 }
682
683 static struct snd_kcontrol_new snd_dummy_controls[] = {
684 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
685 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
686 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
687 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH),
688 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
689 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE),
690 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
691 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC),
692 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
693 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD)
694 };
695
696 static int __devinit snd_card_dummy_new_mixer(struct snd_dummy *dummy)
697 {
698         struct snd_card *card = dummy->card;
699         unsigned int idx;
700         int err;
701
702         if (snd_BUG_ON(!dummy))
703                 return -EINVAL;
704         spin_lock_init(&dummy->mixer_lock);
705         strcpy(card->mixername, "Dummy Mixer");
706
707         for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
708                 err = snd_ctl_add(card, snd_ctl_new1(&snd_dummy_controls[idx], dummy));
709                 if (err < 0)
710                         return err;
711         }
712         return 0;
713 }
714
715 static int __devinit snd_dummy_probe(struct platform_device *devptr)
716 {
717         struct snd_card *card;
718         struct snd_dummy *dummy;
719         int idx, err;
720         int dev = devptr->id;
721
722         err = snd_card_create(index[dev], id[dev], THIS_MODULE,
723                               sizeof(struct snd_dummy), &card);
724         if (err < 0)
725                 return err;
726         dummy = card->private_data;
727         dummy->card = card;
728         for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
729                 if (pcm_substreams[dev] < 1)
730                         pcm_substreams[dev] = 1;
731                 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
732                         pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
733                 err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev]);
734                 if (err < 0)
735                         goto __nodev;
736         }
737         err = snd_card_dummy_new_mixer(dummy);
738         if (err < 0)
739                 goto __nodev;
740         strcpy(card->driver, "Dummy");
741         strcpy(card->shortname, "Dummy");
742         sprintf(card->longname, "Dummy %i", dev + 1);
743
744         snd_card_set_dev(card, &devptr->dev);
745
746         err = snd_card_register(card);
747         if (err == 0) {
748                 platform_set_drvdata(devptr, card);
749                 return 0;
750         }
751       __nodev:
752         snd_card_free(card);
753         return err;
754 }
755
756 static int __devexit snd_dummy_remove(struct platform_device *devptr)
757 {
758         snd_card_free(platform_get_drvdata(devptr));
759         platform_set_drvdata(devptr, NULL);
760         return 0;
761 }
762
763 #ifdef CONFIG_PM
764 static int snd_dummy_suspend(struct platform_device *pdev, pm_message_t state)
765 {
766         struct snd_card *card = platform_get_drvdata(pdev);
767         struct snd_dummy *dummy = card->private_data;
768
769         snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
770         snd_pcm_suspend_all(dummy->pcm);
771         return 0;
772 }
773         
774 static int snd_dummy_resume(struct platform_device *pdev)
775 {
776         struct snd_card *card = platform_get_drvdata(pdev);
777
778         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
779         return 0;
780 }
781 #endif
782
783 #define SND_DUMMY_DRIVER        "snd_dummy"
784
785 static struct platform_driver snd_dummy_driver = {
786         .probe          = snd_dummy_probe,
787         .remove         = __devexit_p(snd_dummy_remove),
788 #ifdef CONFIG_PM
789         .suspend        = snd_dummy_suspend,
790         .resume         = snd_dummy_resume,
791 #endif
792         .driver         = {
793                 .name   = SND_DUMMY_DRIVER
794         },
795 };
796
797 static void snd_dummy_unregister_all(void)
798 {
799         int i;
800
801         for (i = 0; i < ARRAY_SIZE(devices); ++i)
802                 platform_device_unregister(devices[i]);
803         platform_driver_unregister(&snd_dummy_driver);
804 }
805
806 static int __init alsa_card_dummy_init(void)
807 {
808         int i, cards, err;
809
810         err = platform_driver_register(&snd_dummy_driver);
811         if (err < 0)
812                 return err;
813
814         cards = 0;
815         for (i = 0; i < SNDRV_CARDS; i++) {
816                 struct platform_device *device;
817                 if (! enable[i])
818                         continue;
819                 device = platform_device_register_simple(SND_DUMMY_DRIVER,
820                                                          i, NULL, 0);
821                 if (IS_ERR(device))
822                         continue;
823                 if (!platform_get_drvdata(device)) {
824                         platform_device_unregister(device);
825                         continue;
826                 }
827                 devices[i] = device;
828                 cards++;
829         }
830         if (!cards) {
831 #ifdef MODULE
832                 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
833 #endif
834                 snd_dummy_unregister_all();
835                 return -ENODEV;
836         }
837         return 0;
838 }
839
840 static void __exit alsa_card_dummy_exit(void)
841 {
842         snd_dummy_unregister_all();
843 }
844
845 module_init(alsa_card_dummy_init)
846 module_exit(alsa_card_dummy_exit)