e8e29bfb85ec2c4e4f29fa14ba3b48be80b5d58c
[pandora-kernel.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 long base_time;
209         unsigned int frac_pos;  /* fractional sample position (based HZ) */
210         unsigned int frac_period_rest;
211         unsigned int frac_buffer_size;  /* buffer_size * HZ */
212         unsigned int frac_period_size;  /* period_size * HZ */
213         unsigned int rate;
214         int elapsed;
215         struct snd_pcm_substream *substream;
216 };
217
218 static void dummy_systimer_rearm(struct dummy_systimer_pcm *dpcm)
219 {
220         dpcm->timer.expires = jiffies +
221                 (dpcm->frac_period_rest + dpcm->rate - 1) / dpcm->rate;
222         add_timer(&dpcm->timer);
223 }
224
225 static void dummy_systimer_update(struct dummy_systimer_pcm *dpcm)
226 {
227         unsigned long delta;
228
229         delta = jiffies - dpcm->base_time;
230         if (!delta)
231                 return;
232         dpcm->base_time += delta;
233         delta *= dpcm->rate;
234         dpcm->frac_pos += delta;
235         while (dpcm->frac_pos >= dpcm->frac_buffer_size)
236                 dpcm->frac_pos -= dpcm->frac_buffer_size;
237         while (dpcm->frac_period_rest <= delta) {
238                 dpcm->elapsed++;
239                 dpcm->frac_period_rest += dpcm->frac_period_size;
240         }
241         dpcm->frac_period_rest -= delta;
242 }
243
244 static int dummy_systimer_start(struct snd_pcm_substream *substream)
245 {
246         struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
247         spin_lock(&dpcm->lock);
248         dpcm->base_time = jiffies;
249         dummy_systimer_rearm(dpcm);
250         spin_unlock(&dpcm->lock);
251         return 0;
252 }
253
254 static int dummy_systimer_stop(struct snd_pcm_substream *substream)
255 {
256         struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
257         spin_lock(&dpcm->lock);
258         del_timer(&dpcm->timer);
259         spin_unlock(&dpcm->lock);
260         return 0;
261 }
262
263 static int dummy_systimer_prepare(struct snd_pcm_substream *substream)
264 {
265         struct snd_pcm_runtime *runtime = substream->runtime;
266         struct dummy_systimer_pcm *dpcm = runtime->private_data;
267
268         dpcm->frac_pos = 0;
269         dpcm->rate = runtime->rate;
270         dpcm->frac_buffer_size = runtime->buffer_size * HZ;
271         dpcm->frac_period_size = runtime->period_size * HZ;
272         dpcm->frac_period_rest = dpcm->frac_period_size;
273         dpcm->elapsed = 0;
274
275         return 0;
276 }
277
278 static void dummy_systimer_callback(unsigned long data)
279 {
280         struct dummy_systimer_pcm *dpcm = (struct dummy_systimer_pcm *)data;
281         unsigned long flags;
282         int elapsed = 0;
283         
284         spin_lock_irqsave(&dpcm->lock, flags);
285         dummy_systimer_update(dpcm);
286         dummy_systimer_rearm(dpcm);
287         elapsed = dpcm->elapsed;
288         dpcm->elapsed = 0;
289         spin_unlock_irqrestore(&dpcm->lock, flags);
290         if (elapsed)
291                 snd_pcm_period_elapsed(dpcm->substream);
292 }
293
294 static snd_pcm_uframes_t
295 dummy_systimer_pointer(struct snd_pcm_substream *substream)
296 {
297         struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
298         snd_pcm_uframes_t pos;
299
300         spin_lock(&dpcm->lock);
301         dummy_systimer_update(dpcm);
302         pos = dpcm->frac_pos / HZ;
303         spin_unlock(&dpcm->lock);
304         return pos;
305 }
306
307 static int dummy_systimer_create(struct snd_pcm_substream *substream)
308 {
309         struct dummy_systimer_pcm *dpcm;
310
311         dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
312         if (!dpcm)
313                 return -ENOMEM;
314         substream->runtime->private_data = dpcm;
315         init_timer(&dpcm->timer);
316         dpcm->timer.data = (unsigned long) dpcm;
317         dpcm->timer.function = dummy_systimer_callback;
318         spin_lock_init(&dpcm->lock);
319         dpcm->substream = substream;
320         return 0;
321 }
322
323 static void dummy_systimer_free(struct snd_pcm_substream *substream)
324 {
325         kfree(substream->runtime->private_data);
326 }
327
328 static struct dummy_timer_ops dummy_systimer_ops = {
329         .create =       dummy_systimer_create,
330         .free =         dummy_systimer_free,
331         .prepare =      dummy_systimer_prepare,
332         .start =        dummy_systimer_start,
333         .stop =         dummy_systimer_stop,
334         .pointer =      dummy_systimer_pointer,
335 };
336
337 #ifdef CONFIG_HIGH_RES_TIMERS
338 /*
339  * hrtimer interface
340  */
341
342 struct dummy_hrtimer_pcm {
343         ktime_t base_time;
344         ktime_t period_time;
345         atomic_t running;
346         struct hrtimer timer;
347         struct tasklet_struct tasklet;
348         struct snd_pcm_substream *substream;
349 };
350
351 static void dummy_hrtimer_pcm_elapsed(unsigned long priv)
352 {
353         struct dummy_hrtimer_pcm *dpcm = (struct dummy_hrtimer_pcm *)priv;
354         if (atomic_read(&dpcm->running))
355                 snd_pcm_period_elapsed(dpcm->substream);
356 }
357
358 static enum hrtimer_restart dummy_hrtimer_callback(struct hrtimer *timer)
359 {
360         struct dummy_hrtimer_pcm *dpcm;
361
362         dpcm = container_of(timer, struct dummy_hrtimer_pcm, timer);
363         if (!atomic_read(&dpcm->running))
364                 return HRTIMER_NORESTART;
365         tasklet_schedule(&dpcm->tasklet);
366         hrtimer_forward_now(timer, dpcm->period_time);
367         return HRTIMER_RESTART;
368 }
369
370 static int dummy_hrtimer_start(struct snd_pcm_substream *substream)
371 {
372         struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
373
374         dpcm->base_time = hrtimer_cb_get_time(&dpcm->timer);
375         hrtimer_start(&dpcm->timer, dpcm->period_time, HRTIMER_MODE_REL);
376         atomic_set(&dpcm->running, 1);
377         return 0;
378 }
379
380 static int dummy_hrtimer_stop(struct snd_pcm_substream *substream)
381 {
382         struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
383
384         atomic_set(&dpcm->running, 0);
385         hrtimer_cancel(&dpcm->timer);
386         return 0;
387 }
388
389 static inline void dummy_hrtimer_sync(struct dummy_hrtimer_pcm *dpcm)
390 {
391         tasklet_kill(&dpcm->tasklet);
392 }
393
394 static snd_pcm_uframes_t
395 dummy_hrtimer_pointer(struct snd_pcm_substream *substream)
396 {
397         struct snd_pcm_runtime *runtime = substream->runtime;
398         struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
399         u64 delta;
400         u32 pos;
401
402         delta = ktime_us_delta(hrtimer_cb_get_time(&dpcm->timer),
403                                dpcm->base_time);
404         delta = div_u64(delta * runtime->rate + 999999, 1000000);
405         div_u64_rem(delta, runtime->buffer_size, &pos);
406         return pos;
407 }
408
409 static int dummy_hrtimer_prepare(struct snd_pcm_substream *substream)
410 {
411         struct snd_pcm_runtime *runtime = substream->runtime;
412         struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
413         unsigned int period, rate;
414         long sec;
415         unsigned long nsecs;
416
417         dummy_hrtimer_sync(dpcm);
418         period = runtime->period_size;
419         rate = runtime->rate;
420         sec = period / rate;
421         period %= rate;
422         nsecs = div_u64((u64)period * 1000000000UL + rate - 1, rate);
423         dpcm->period_time = ktime_set(sec, nsecs);
424
425         return 0;
426 }
427
428 static int dummy_hrtimer_create(struct snd_pcm_substream *substream)
429 {
430         struct dummy_hrtimer_pcm *dpcm;
431
432         dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
433         if (!dpcm)
434                 return -ENOMEM;
435         substream->runtime->private_data = dpcm;
436         hrtimer_init(&dpcm->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
437         dpcm->timer.function = dummy_hrtimer_callback;
438         dpcm->substream = substream;
439         atomic_set(&dpcm->running, 0);
440         tasklet_init(&dpcm->tasklet, dummy_hrtimer_pcm_elapsed,
441                      (unsigned long)dpcm);
442         return 0;
443 }
444
445 static void dummy_hrtimer_free(struct snd_pcm_substream *substream)
446 {
447         struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
448         dummy_hrtimer_sync(dpcm);
449         kfree(dpcm);
450 }
451
452 static struct dummy_timer_ops dummy_hrtimer_ops = {
453         .create =       dummy_hrtimer_create,
454         .free =         dummy_hrtimer_free,
455         .prepare =      dummy_hrtimer_prepare,
456         .start =        dummy_hrtimer_start,
457         .stop =         dummy_hrtimer_stop,
458         .pointer =      dummy_hrtimer_pointer,
459 };
460
461 #endif /* CONFIG_HIGH_RES_TIMERS */
462
463 /*
464  * PCM interface
465  */
466
467 static int dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
468 {
469         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
470
471         switch (cmd) {
472         case SNDRV_PCM_TRIGGER_START:
473         case SNDRV_PCM_TRIGGER_RESUME:
474                 return dummy->timer_ops->start(substream);
475         case SNDRV_PCM_TRIGGER_STOP:
476         case SNDRV_PCM_TRIGGER_SUSPEND:
477                 return dummy->timer_ops->stop(substream);
478         }
479         return -EINVAL;
480 }
481
482 static int dummy_pcm_prepare(struct snd_pcm_substream *substream)
483 {
484         struct snd_pcm_runtime *runtime = substream->runtime;
485         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
486
487         snd_pcm_format_set_silence(runtime->format, runtime->dma_area,
488                         bytes_to_samples(runtime, runtime->dma_bytes));
489         return dummy->timer_ops->prepare(substream);
490 }
491
492 static snd_pcm_uframes_t dummy_pcm_pointer(struct snd_pcm_substream *substream)
493 {
494         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
495
496         return dummy->timer_ops->pointer(substream);
497 }
498
499 static struct snd_pcm_hardware dummy_pcm_hardware = {
500         .info =                 (SNDRV_PCM_INFO_MMAP |
501                                  SNDRV_PCM_INFO_INTERLEAVED |
502                                  SNDRV_PCM_INFO_RESUME |
503                                  SNDRV_PCM_INFO_MMAP_VALID),
504         .formats =              USE_FORMATS,
505         .rates =                USE_RATE,
506         .rate_min =             USE_RATE_MIN,
507         .rate_max =             USE_RATE_MAX,
508         .channels_min =         USE_CHANNELS_MIN,
509         .channels_max =         USE_CHANNELS_MAX,
510         .buffer_bytes_max =     MAX_BUFFER_SIZE,
511         .period_bytes_min =     64,
512         .period_bytes_max =     MAX_PERIOD_SIZE,
513         .periods_min =          USE_PERIODS_MIN,
514         .periods_max =          USE_PERIODS_MAX,
515         .fifo_size =            0,
516 };
517
518 static int dummy_pcm_hw_params(struct snd_pcm_substream *substream,
519                                struct snd_pcm_hw_params *hw_params)
520 {
521         return snd_pcm_lib_malloc_pages(substream,
522                                         params_buffer_bytes(hw_params));
523 }
524
525 static int dummy_pcm_hw_free(struct snd_pcm_substream *substream)
526 {
527         return snd_pcm_lib_free_pages(substream);
528 }
529
530 static int dummy_pcm_open(struct snd_pcm_substream *substream)
531 {
532         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
533         struct snd_pcm_runtime *runtime = substream->runtime;
534         int err;
535
536         dummy->timer_ops = &dummy_systimer_ops;
537 #ifdef CONFIG_HIGH_RES_TIMERS
538         if (hrtimer)
539                 dummy->timer_ops = &dummy_hrtimer_ops;
540 #endif
541
542         err = dummy->timer_ops->create(substream);
543         if (err < 0)
544                 return err;
545
546         runtime->hw = dummy_pcm_hardware;
547         if (substream->pcm->device & 1) {
548                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
549                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
550         }
551         if (substream->pcm->device & 2)
552                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP |
553                                       SNDRV_PCM_INFO_MMAP_VALID);
554
555         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
556                 err = add_playback_constraints(substream->runtime);
557         else
558                 err = add_capture_constraints(substream->runtime);
559         if (err < 0) {
560                 dummy->timer_ops->free(substream);
561                 return err;
562         }
563         return 0;
564 }
565
566 static int dummy_pcm_close(struct snd_pcm_substream *substream)
567 {
568         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
569         dummy->timer_ops->free(substream);
570         return 0;
571 }
572
573 static struct snd_pcm_ops dummy_pcm_ops = {
574         .open =         dummy_pcm_open,
575         .close =        dummy_pcm_close,
576         .ioctl =        snd_pcm_lib_ioctl,
577         .hw_params =    dummy_pcm_hw_params,
578         .hw_free =      dummy_pcm_hw_free,
579         .prepare =      dummy_pcm_prepare,
580         .trigger =      dummy_pcm_trigger,
581         .pointer =      dummy_pcm_pointer,
582 };
583
584 static int __devinit snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
585                                         int substreams)
586 {
587         struct snd_pcm *pcm;
588         int err;
589
590         err = snd_pcm_new(dummy->card, "Dummy PCM", device,
591                                substreams, substreams, &pcm);
592         if (err < 0)
593                 return err;
594         dummy->pcm = pcm;
595         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &dummy_pcm_ops);
596         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &dummy_pcm_ops);
597         pcm->private_data = dummy;
598         pcm->info_flags = 0;
599         strcpy(pcm->name, "Dummy PCM");
600         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
601                                               snd_dma_continuous_data(GFP_KERNEL),
602                                               0, 64*1024);
603         return 0;
604 }
605
606 #define DUMMY_VOLUME(xname, xindex, addr) \
607 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
608   .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
609   .name = xname, .index = xindex, \
610   .info = snd_dummy_volume_info, \
611   .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
612   .private_value = addr, \
613   .tlv = { .p = db_scale_dummy } }
614
615 static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
616                                  struct snd_ctl_elem_info *uinfo)
617 {
618         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
619         uinfo->count = 2;
620         uinfo->value.integer.min = -50;
621         uinfo->value.integer.max = 100;
622         return 0;
623 }
624  
625 static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
626                                 struct snd_ctl_elem_value *ucontrol)
627 {
628         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
629         int addr = kcontrol->private_value;
630
631         spin_lock_irq(&dummy->mixer_lock);
632         ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
633         ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
634         spin_unlock_irq(&dummy->mixer_lock);
635         return 0;
636 }
637
638 static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
639                                 struct snd_ctl_elem_value *ucontrol)
640 {
641         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
642         int change, addr = kcontrol->private_value;
643         int left, right;
644
645         left = ucontrol->value.integer.value[0];
646         if (left < -50)
647                 left = -50;
648         if (left > 100)
649                 left = 100;
650         right = ucontrol->value.integer.value[1];
651         if (right < -50)
652                 right = -50;
653         if (right > 100)
654                 right = 100;
655         spin_lock_irq(&dummy->mixer_lock);
656         change = dummy->mixer_volume[addr][0] != left ||
657                  dummy->mixer_volume[addr][1] != right;
658         dummy->mixer_volume[addr][0] = left;
659         dummy->mixer_volume[addr][1] = right;
660         spin_unlock_irq(&dummy->mixer_lock);
661         return change;
662 }
663
664 static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0);
665
666 #define DUMMY_CAPSRC(xname, xindex, addr) \
667 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
668   .info = snd_dummy_capsrc_info, \
669   .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
670   .private_value = addr }
671
672 #define snd_dummy_capsrc_info   snd_ctl_boolean_stereo_info
673  
674 static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
675                                 struct snd_ctl_elem_value *ucontrol)
676 {
677         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
678         int addr = kcontrol->private_value;
679
680         spin_lock_irq(&dummy->mixer_lock);
681         ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
682         ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
683         spin_unlock_irq(&dummy->mixer_lock);
684         return 0;
685 }
686
687 static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
688 {
689         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
690         int change, addr = kcontrol->private_value;
691         int left, right;
692
693         left = ucontrol->value.integer.value[0] & 1;
694         right = ucontrol->value.integer.value[1] & 1;
695         spin_lock_irq(&dummy->mixer_lock);
696         change = dummy->capture_source[addr][0] != left &&
697                  dummy->capture_source[addr][1] != right;
698         dummy->capture_source[addr][0] = left;
699         dummy->capture_source[addr][1] = right;
700         spin_unlock_irq(&dummy->mixer_lock);
701         return change;
702 }
703
704 static struct snd_kcontrol_new snd_dummy_controls[] = {
705 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
706 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
707 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
708 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH),
709 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
710 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE),
711 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
712 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC),
713 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
714 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD)
715 };
716
717 static int __devinit snd_card_dummy_new_mixer(struct snd_dummy *dummy)
718 {
719         struct snd_card *card = dummy->card;
720         unsigned int idx;
721         int err;
722
723         if (snd_BUG_ON(!dummy))
724                 return -EINVAL;
725         spin_lock_init(&dummy->mixer_lock);
726         strcpy(card->mixername, "Dummy Mixer");
727
728         for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
729                 err = snd_ctl_add(card, snd_ctl_new1(&snd_dummy_controls[idx], dummy));
730                 if (err < 0)
731                         return err;
732         }
733         return 0;
734 }
735
736 static int __devinit snd_dummy_probe(struct platform_device *devptr)
737 {
738         struct snd_card *card;
739         struct snd_dummy *dummy;
740         int idx, err;
741         int dev = devptr->id;
742
743         err = snd_card_create(index[dev], id[dev], THIS_MODULE,
744                               sizeof(struct snd_dummy), &card);
745         if (err < 0)
746                 return err;
747         dummy = card->private_data;
748         dummy->card = card;
749         for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
750                 if (pcm_substreams[dev] < 1)
751                         pcm_substreams[dev] = 1;
752                 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
753                         pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
754                 err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev]);
755                 if (err < 0)
756                         goto __nodev;
757         }
758         err = snd_card_dummy_new_mixer(dummy);
759         if (err < 0)
760                 goto __nodev;
761         strcpy(card->driver, "Dummy");
762         strcpy(card->shortname, "Dummy");
763         sprintf(card->longname, "Dummy %i", dev + 1);
764
765         snd_card_set_dev(card, &devptr->dev);
766
767         err = snd_card_register(card);
768         if (err == 0) {
769                 platform_set_drvdata(devptr, card);
770                 return 0;
771         }
772       __nodev:
773         snd_card_free(card);
774         return err;
775 }
776
777 static int __devexit snd_dummy_remove(struct platform_device *devptr)
778 {
779         snd_card_free(platform_get_drvdata(devptr));
780         platform_set_drvdata(devptr, NULL);
781         return 0;
782 }
783
784 #ifdef CONFIG_PM
785 static int snd_dummy_suspend(struct platform_device *pdev, pm_message_t state)
786 {
787         struct snd_card *card = platform_get_drvdata(pdev);
788         struct snd_dummy *dummy = card->private_data;
789
790         snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
791         snd_pcm_suspend_all(dummy->pcm);
792         return 0;
793 }
794         
795 static int snd_dummy_resume(struct platform_device *pdev)
796 {
797         struct snd_card *card = platform_get_drvdata(pdev);
798
799         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
800         return 0;
801 }
802 #endif
803
804 #define SND_DUMMY_DRIVER        "snd_dummy"
805
806 static struct platform_driver snd_dummy_driver = {
807         .probe          = snd_dummy_probe,
808         .remove         = __devexit_p(snd_dummy_remove),
809 #ifdef CONFIG_PM
810         .suspend        = snd_dummy_suspend,
811         .resume         = snd_dummy_resume,
812 #endif
813         .driver         = {
814                 .name   = SND_DUMMY_DRIVER
815         },
816 };
817
818 static void snd_dummy_unregister_all(void)
819 {
820         int i;
821
822         for (i = 0; i < ARRAY_SIZE(devices); ++i)
823                 platform_device_unregister(devices[i]);
824         platform_driver_unregister(&snd_dummy_driver);
825 }
826
827 static int __init alsa_card_dummy_init(void)
828 {
829         int i, cards, err;
830
831         err = platform_driver_register(&snd_dummy_driver);
832         if (err < 0)
833                 return err;
834
835         cards = 0;
836         for (i = 0; i < SNDRV_CARDS; i++) {
837                 struct platform_device *device;
838                 if (! enable[i])
839                         continue;
840                 device = platform_device_register_simple(SND_DUMMY_DRIVER,
841                                                          i, NULL, 0);
842                 if (IS_ERR(device))
843                         continue;
844                 if (!platform_get_drvdata(device)) {
845                         platform_device_unregister(device);
846                         continue;
847                 }
848                 devices[i] = device;
849                 cards++;
850         }
851         if (!cards) {
852 #ifdef MODULE
853                 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
854 #endif
855                 snd_dummy_unregister_all();
856                 return -ENODEV;
857         }
858         return 0;
859 }
860
861 static void __exit alsa_card_dummy_exit(void)
862 {
863         snd_dummy_unregister_all();
864 }
865
866 module_init(alsa_card_dummy_init)
867 module_exit(alsa_card_dummy_exit)