7f41990ed68b74f557caa6b180cd1b11db3ad2ef
[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/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 int 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 int hrtimer = 1;
70 #endif
71 static int 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         const struct dummy_timer_ops *timer_ops;
138 };
139
140 /*
141  * card models
142  */
143
144 static int emu10k1_playback_constraints(struct snd_pcm_runtime *runtime)
145 {
146         int err;
147         err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
148         if (err < 0)
149                 return err;
150         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256, UINT_MAX);
151         if (err < 0)
152                 return err;
153         return 0;
154 }
155
156 struct dummy_model model_emu10k1 = {
157         .name = "emu10k1",
158         .playback_constraints = emu10k1_playback_constraints,
159         .buffer_bytes_max = 128 * 1024,
160 };
161
162 struct dummy_model model_rme9652 = {
163         .name = "rme9652",
164         .buffer_bytes_max = 26 * 64 * 1024,
165         .formats = SNDRV_PCM_FMTBIT_S32_LE,
166         .channels_min = 26,
167         .channels_max = 26,
168         .periods_min = 2,
169         .periods_max = 2,
170 };
171
172 struct dummy_model model_ice1712 = {
173         .name = "ice1712",
174         .buffer_bytes_max = 256 * 1024,
175         .formats = SNDRV_PCM_FMTBIT_S32_LE,
176         .channels_min = 10,
177         .channels_max = 10,
178         .periods_min = 1,
179         .periods_max = 1024,
180 };
181
182 struct dummy_model model_uda1341 = {
183         .name = "uda1341",
184         .buffer_bytes_max = 16380,
185         .formats = SNDRV_PCM_FMTBIT_S16_LE,
186         .channels_min = 2,
187         .channels_max = 2,
188         .periods_min = 2,
189         .periods_max = 255,
190 };
191
192 struct dummy_model model_ac97 = {
193         .name = "ac97",
194         .formats = SNDRV_PCM_FMTBIT_S16_LE,
195         .channels_min = 2,
196         .channels_max = 2,
197         .rates = SNDRV_PCM_RATE_48000,
198         .rate_min = 48000,
199         .rate_max = 48000,
200 };
201
202 struct dummy_model model_ca0106 = {
203         .name = "ca0106",
204         .formats = SNDRV_PCM_FMTBIT_S16_LE,
205         .buffer_bytes_max = ((65536-64)*8),
206         .period_bytes_max = (65536-64),
207         .periods_min = 2,
208         .periods_max = 8,
209         .channels_min = 2,
210         .channels_max = 2,
211         .rates = SNDRV_PCM_RATE_48000|SNDRV_PCM_RATE_96000|SNDRV_PCM_RATE_192000,
212         .rate_min = 48000,
213         .rate_max = 192000,
214 };
215
216 struct dummy_model *dummy_models[] = {
217         &model_emu10k1,
218         &model_rme9652,
219         &model_ice1712,
220         &model_uda1341,
221         &model_ac97,
222         &model_ca0106,
223         NULL
224 };
225
226 /*
227  * system timer interface
228  */
229
230 struct dummy_systimer_pcm {
231         spinlock_t lock;
232         struct timer_list timer;
233         unsigned long base_time;
234         unsigned int frac_pos;  /* fractional sample position (based HZ) */
235         unsigned int frac_period_rest;
236         unsigned int frac_buffer_size;  /* buffer_size * HZ */
237         unsigned int frac_period_size;  /* period_size * HZ */
238         unsigned int rate;
239         int elapsed;
240         struct snd_pcm_substream *substream;
241 };
242
243 static void dummy_systimer_rearm(struct dummy_systimer_pcm *dpcm)
244 {
245         dpcm->timer.expires = jiffies +
246                 (dpcm->frac_period_rest + dpcm->rate - 1) / dpcm->rate;
247         add_timer(&dpcm->timer);
248 }
249
250 static void dummy_systimer_update(struct dummy_systimer_pcm *dpcm)
251 {
252         unsigned long delta;
253
254         delta = jiffies - dpcm->base_time;
255         if (!delta)
256                 return;
257         dpcm->base_time += delta;
258         delta *= dpcm->rate;
259         dpcm->frac_pos += delta;
260         while (dpcm->frac_pos >= dpcm->frac_buffer_size)
261                 dpcm->frac_pos -= dpcm->frac_buffer_size;
262         while (dpcm->frac_period_rest <= delta) {
263                 dpcm->elapsed++;
264                 dpcm->frac_period_rest += dpcm->frac_period_size;
265         }
266         dpcm->frac_period_rest -= delta;
267 }
268
269 static int dummy_systimer_start(struct snd_pcm_substream *substream)
270 {
271         struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
272         spin_lock(&dpcm->lock);
273         dpcm->base_time = jiffies;
274         dummy_systimer_rearm(dpcm);
275         spin_unlock(&dpcm->lock);
276         return 0;
277 }
278
279 static int dummy_systimer_stop(struct snd_pcm_substream *substream)
280 {
281         struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
282         spin_lock(&dpcm->lock);
283         del_timer(&dpcm->timer);
284         spin_unlock(&dpcm->lock);
285         return 0;
286 }
287
288 static int dummy_systimer_prepare(struct snd_pcm_substream *substream)
289 {
290         struct snd_pcm_runtime *runtime = substream->runtime;
291         struct dummy_systimer_pcm *dpcm = runtime->private_data;
292
293         dpcm->frac_pos = 0;
294         dpcm->rate = runtime->rate;
295         dpcm->frac_buffer_size = runtime->buffer_size * HZ;
296         dpcm->frac_period_size = runtime->period_size * HZ;
297         dpcm->frac_period_rest = dpcm->frac_period_size;
298         dpcm->elapsed = 0;
299
300         return 0;
301 }
302
303 static void dummy_systimer_callback(unsigned long data)
304 {
305         struct dummy_systimer_pcm *dpcm = (struct dummy_systimer_pcm *)data;
306         unsigned long flags;
307         int elapsed = 0;
308         
309         spin_lock_irqsave(&dpcm->lock, flags);
310         dummy_systimer_update(dpcm);
311         dummy_systimer_rearm(dpcm);
312         elapsed = dpcm->elapsed;
313         dpcm->elapsed = 0;
314         spin_unlock_irqrestore(&dpcm->lock, flags);
315         if (elapsed)
316                 snd_pcm_period_elapsed(dpcm->substream);
317 }
318
319 static snd_pcm_uframes_t
320 dummy_systimer_pointer(struct snd_pcm_substream *substream)
321 {
322         struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
323         snd_pcm_uframes_t pos;
324
325         spin_lock(&dpcm->lock);
326         dummy_systimer_update(dpcm);
327         pos = dpcm->frac_pos / HZ;
328         spin_unlock(&dpcm->lock);
329         return pos;
330 }
331
332 static int dummy_systimer_create(struct snd_pcm_substream *substream)
333 {
334         struct dummy_systimer_pcm *dpcm;
335
336         dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
337         if (!dpcm)
338                 return -ENOMEM;
339         substream->runtime->private_data = dpcm;
340         init_timer(&dpcm->timer);
341         dpcm->timer.data = (unsigned long) dpcm;
342         dpcm->timer.function = dummy_systimer_callback;
343         spin_lock_init(&dpcm->lock);
344         dpcm->substream = substream;
345         return 0;
346 }
347
348 static void dummy_systimer_free(struct snd_pcm_substream *substream)
349 {
350         kfree(substream->runtime->private_data);
351 }
352
353 static struct dummy_timer_ops dummy_systimer_ops = {
354         .create =       dummy_systimer_create,
355         .free =         dummy_systimer_free,
356         .prepare =      dummy_systimer_prepare,
357         .start =        dummy_systimer_start,
358         .stop =         dummy_systimer_stop,
359         .pointer =      dummy_systimer_pointer,
360 };
361
362 #ifdef CONFIG_HIGH_RES_TIMERS
363 /*
364  * hrtimer interface
365  */
366
367 struct dummy_hrtimer_pcm {
368         ktime_t base_time;
369         ktime_t period_time;
370         atomic_t running;
371         struct hrtimer timer;
372         struct tasklet_struct tasklet;
373         struct snd_pcm_substream *substream;
374 };
375
376 static void dummy_hrtimer_pcm_elapsed(unsigned long priv)
377 {
378         struct dummy_hrtimer_pcm *dpcm = (struct dummy_hrtimer_pcm *)priv;
379         if (atomic_read(&dpcm->running))
380                 snd_pcm_period_elapsed(dpcm->substream);
381 }
382
383 static enum hrtimer_restart dummy_hrtimer_callback(struct hrtimer *timer)
384 {
385         struct dummy_hrtimer_pcm *dpcm;
386
387         dpcm = container_of(timer, struct dummy_hrtimer_pcm, timer);
388         if (!atomic_read(&dpcm->running))
389                 return HRTIMER_NORESTART;
390         tasklet_schedule(&dpcm->tasklet);
391         hrtimer_forward_now(timer, dpcm->period_time);
392         return HRTIMER_RESTART;
393 }
394
395 static int dummy_hrtimer_start(struct snd_pcm_substream *substream)
396 {
397         struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
398
399         dpcm->base_time = hrtimer_cb_get_time(&dpcm->timer);
400         hrtimer_start(&dpcm->timer, dpcm->period_time, HRTIMER_MODE_REL);
401         atomic_set(&dpcm->running, 1);
402         return 0;
403 }
404
405 static int dummy_hrtimer_stop(struct snd_pcm_substream *substream)
406 {
407         struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
408
409         atomic_set(&dpcm->running, 0);
410         hrtimer_cancel(&dpcm->timer);
411         return 0;
412 }
413
414 static inline void dummy_hrtimer_sync(struct dummy_hrtimer_pcm *dpcm)
415 {
416         tasklet_kill(&dpcm->tasklet);
417 }
418
419 static snd_pcm_uframes_t
420 dummy_hrtimer_pointer(struct snd_pcm_substream *substream)
421 {
422         struct snd_pcm_runtime *runtime = substream->runtime;
423         struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
424         u64 delta;
425         u32 pos;
426
427         delta = ktime_us_delta(hrtimer_cb_get_time(&dpcm->timer),
428                                dpcm->base_time);
429         delta = div_u64(delta * runtime->rate + 999999, 1000000);
430         div_u64_rem(delta, runtime->buffer_size, &pos);
431         return pos;
432 }
433
434 static int dummy_hrtimer_prepare(struct snd_pcm_substream *substream)
435 {
436         struct snd_pcm_runtime *runtime = substream->runtime;
437         struct dummy_hrtimer_pcm *dpcm = runtime->private_data;
438         unsigned int period, rate;
439         long sec;
440         unsigned long nsecs;
441
442         dummy_hrtimer_sync(dpcm);
443         period = runtime->period_size;
444         rate = runtime->rate;
445         sec = period / rate;
446         period %= rate;
447         nsecs = div_u64((u64)period * 1000000000UL + rate - 1, rate);
448         dpcm->period_time = ktime_set(sec, nsecs);
449
450         return 0;
451 }
452
453 static int dummy_hrtimer_create(struct snd_pcm_substream *substream)
454 {
455         struct dummy_hrtimer_pcm *dpcm;
456
457         dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
458         if (!dpcm)
459                 return -ENOMEM;
460         substream->runtime->private_data = dpcm;
461         hrtimer_init(&dpcm->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
462         dpcm->timer.function = dummy_hrtimer_callback;
463         dpcm->substream = substream;
464         atomic_set(&dpcm->running, 0);
465         tasklet_init(&dpcm->tasklet, dummy_hrtimer_pcm_elapsed,
466                      (unsigned long)dpcm);
467         return 0;
468 }
469
470 static void dummy_hrtimer_free(struct snd_pcm_substream *substream)
471 {
472         struct dummy_hrtimer_pcm *dpcm = substream->runtime->private_data;
473         dummy_hrtimer_sync(dpcm);
474         kfree(dpcm);
475 }
476
477 static struct dummy_timer_ops dummy_hrtimer_ops = {
478         .create =       dummy_hrtimer_create,
479         .free =         dummy_hrtimer_free,
480         .prepare =      dummy_hrtimer_prepare,
481         .start =        dummy_hrtimer_start,
482         .stop =         dummy_hrtimer_stop,
483         .pointer =      dummy_hrtimer_pointer,
484 };
485
486 #endif /* CONFIG_HIGH_RES_TIMERS */
487
488 /*
489  * PCM interface
490  */
491
492 static int dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
493 {
494         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
495
496         switch (cmd) {
497         case SNDRV_PCM_TRIGGER_START:
498         case SNDRV_PCM_TRIGGER_RESUME:
499                 return dummy->timer_ops->start(substream);
500         case SNDRV_PCM_TRIGGER_STOP:
501         case SNDRV_PCM_TRIGGER_SUSPEND:
502                 return dummy->timer_ops->stop(substream);
503         }
504         return -EINVAL;
505 }
506
507 static int dummy_pcm_prepare(struct snd_pcm_substream *substream)
508 {
509         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
510
511         return dummy->timer_ops->prepare(substream);
512 }
513
514 static snd_pcm_uframes_t dummy_pcm_pointer(struct snd_pcm_substream *substream)
515 {
516         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
517
518         return dummy->timer_ops->pointer(substream);
519 }
520
521 static struct snd_pcm_hardware dummy_pcm_hardware = {
522         .info =                 (SNDRV_PCM_INFO_MMAP |
523                                  SNDRV_PCM_INFO_INTERLEAVED |
524                                  SNDRV_PCM_INFO_RESUME |
525                                  SNDRV_PCM_INFO_MMAP_VALID),
526         .formats =              USE_FORMATS,
527         .rates =                USE_RATE,
528         .rate_min =             USE_RATE_MIN,
529         .rate_max =             USE_RATE_MAX,
530         .channels_min =         USE_CHANNELS_MIN,
531         .channels_max =         USE_CHANNELS_MAX,
532         .buffer_bytes_max =     MAX_BUFFER_SIZE,
533         .period_bytes_min =     MIN_PERIOD_SIZE,
534         .period_bytes_max =     MAX_PERIOD_SIZE,
535         .periods_min =          USE_PERIODS_MIN,
536         .periods_max =          USE_PERIODS_MAX,
537         .fifo_size =            0,
538 };
539
540 static int dummy_pcm_hw_params(struct snd_pcm_substream *substream,
541                                struct snd_pcm_hw_params *hw_params)
542 {
543         if (fake_buffer) {
544                 /* runtime->dma_bytes has to be set manually to allow mmap */
545                 substream->runtime->dma_bytes = params_buffer_bytes(hw_params);
546                 return 0;
547         }
548         return snd_pcm_lib_malloc_pages(substream,
549                                         params_buffer_bytes(hw_params));
550 }
551
552 static int dummy_pcm_hw_free(struct snd_pcm_substream *substream)
553 {
554         if (fake_buffer)
555                 return 0;
556         return snd_pcm_lib_free_pages(substream);
557 }
558
559 static int dummy_pcm_open(struct snd_pcm_substream *substream)
560 {
561         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
562         struct dummy_model *model = dummy->model;
563         struct snd_pcm_runtime *runtime = substream->runtime;
564         int err;
565
566         dummy->timer_ops = &dummy_systimer_ops;
567 #ifdef CONFIG_HIGH_RES_TIMERS
568         if (hrtimer)
569                 dummy->timer_ops = &dummy_hrtimer_ops;
570 #endif
571
572         err = dummy->timer_ops->create(substream);
573         if (err < 0)
574                 return err;
575
576         runtime->hw = dummy->pcm_hw;
577         if (substream->pcm->device & 1) {
578                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
579                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
580         }
581         if (substream->pcm->device & 2)
582                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP |
583                                       SNDRV_PCM_INFO_MMAP_VALID);
584
585         if (model == NULL)
586                 return 0;
587
588         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
589                 if (model->playback_constraints)
590                         err = model->playback_constraints(substream->runtime);
591         } else {
592                 if (model->capture_constraints)
593                         err = model->capture_constraints(substream->runtime);
594         }
595         if (err < 0) {
596                 dummy->timer_ops->free(substream);
597                 return err;
598         }
599         return 0;
600 }
601
602 static int dummy_pcm_close(struct snd_pcm_substream *substream)
603 {
604         struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
605         dummy->timer_ops->free(substream);
606         return 0;
607 }
608
609 /*
610  * dummy buffer handling
611  */
612
613 static void *dummy_page[2];
614
615 static void free_fake_buffer(void)
616 {
617         if (fake_buffer) {
618                 int i;
619                 for (i = 0; i < 2; i++)
620                         if (dummy_page[i]) {
621                                 free_page((unsigned long)dummy_page[i]);
622                                 dummy_page[i] = NULL;
623                         }
624         }
625 }
626
627 static int alloc_fake_buffer(void)
628 {
629         int i;
630
631         if (!fake_buffer)
632                 return 0;
633         for (i = 0; i < 2; i++) {
634                 dummy_page[i] = (void *)get_zeroed_page(GFP_KERNEL);
635                 if (!dummy_page[i]) {
636                         free_fake_buffer();
637                         return -ENOMEM;
638                 }
639         }
640         return 0;
641 }
642
643 static int dummy_pcm_copy(struct snd_pcm_substream *substream,
644                           int channel, snd_pcm_uframes_t pos,
645                           void __user *dst, snd_pcm_uframes_t count)
646 {
647         return 0; /* do nothing */
648 }
649
650 static int dummy_pcm_silence(struct snd_pcm_substream *substream,
651                              int channel, snd_pcm_uframes_t pos,
652                              snd_pcm_uframes_t count)
653 {
654         return 0; /* do nothing */
655 }
656
657 static struct page *dummy_pcm_page(struct snd_pcm_substream *substream,
658                                    unsigned long offset)
659 {
660         return virt_to_page(dummy_page[substream->stream]); /* the same page */
661 }
662
663 static struct snd_pcm_ops dummy_pcm_ops = {
664         .open =         dummy_pcm_open,
665         .close =        dummy_pcm_close,
666         .ioctl =        snd_pcm_lib_ioctl,
667         .hw_params =    dummy_pcm_hw_params,
668         .hw_free =      dummy_pcm_hw_free,
669         .prepare =      dummy_pcm_prepare,
670         .trigger =      dummy_pcm_trigger,
671         .pointer =      dummy_pcm_pointer,
672 };
673
674 static struct snd_pcm_ops dummy_pcm_ops_no_buf = {
675         .open =         dummy_pcm_open,
676         .close =        dummy_pcm_close,
677         .ioctl =        snd_pcm_lib_ioctl,
678         .hw_params =    dummy_pcm_hw_params,
679         .hw_free =      dummy_pcm_hw_free,
680         .prepare =      dummy_pcm_prepare,
681         .trigger =      dummy_pcm_trigger,
682         .pointer =      dummy_pcm_pointer,
683         .copy =         dummy_pcm_copy,
684         .silence =      dummy_pcm_silence,
685         .page =         dummy_pcm_page,
686 };
687
688 static int __devinit snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
689                                         int substreams)
690 {
691         struct snd_pcm *pcm;
692         struct snd_pcm_ops *ops;
693         int err;
694
695         err = snd_pcm_new(dummy->card, "Dummy PCM", device,
696                                substreams, substreams, &pcm);
697         if (err < 0)
698                 return err;
699         dummy->pcm = pcm;
700         if (fake_buffer)
701                 ops = &dummy_pcm_ops_no_buf;
702         else
703                 ops = &dummy_pcm_ops;
704         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, ops);
705         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, ops);
706         pcm->private_data = dummy;
707         pcm->info_flags = 0;
708         strcpy(pcm->name, "Dummy PCM");
709         if (!fake_buffer) {
710                 snd_pcm_lib_preallocate_pages_for_all(pcm,
711                         SNDRV_DMA_TYPE_CONTINUOUS,
712                         snd_dma_continuous_data(GFP_KERNEL),
713                         0, 64*1024);
714         }
715         return 0;
716 }
717
718 /*
719  * mixer interface
720  */
721
722 #define DUMMY_VOLUME(xname, xindex, addr) \
723 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
724   .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
725   .name = xname, .index = xindex, \
726   .info = snd_dummy_volume_info, \
727   .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
728   .private_value = addr, \
729   .tlv = { .p = db_scale_dummy } }
730
731 static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
732                                  struct snd_ctl_elem_info *uinfo)
733 {
734         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
735         uinfo->count = 2;
736         uinfo->value.integer.min = -50;
737         uinfo->value.integer.max = 100;
738         return 0;
739 }
740  
741 static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
742                                 struct snd_ctl_elem_value *ucontrol)
743 {
744         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
745         int addr = kcontrol->private_value;
746
747         spin_lock_irq(&dummy->mixer_lock);
748         ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
749         ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
750         spin_unlock_irq(&dummy->mixer_lock);
751         return 0;
752 }
753
754 static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
755                                 struct snd_ctl_elem_value *ucontrol)
756 {
757         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
758         int change, addr = kcontrol->private_value;
759         int left, right;
760
761         left = ucontrol->value.integer.value[0];
762         if (left < -50)
763                 left = -50;
764         if (left > 100)
765                 left = 100;
766         right = ucontrol->value.integer.value[1];
767         if (right < -50)
768                 right = -50;
769         if (right > 100)
770                 right = 100;
771         spin_lock_irq(&dummy->mixer_lock);
772         change = dummy->mixer_volume[addr][0] != left ||
773                  dummy->mixer_volume[addr][1] != right;
774         dummy->mixer_volume[addr][0] = left;
775         dummy->mixer_volume[addr][1] = right;
776         spin_unlock_irq(&dummy->mixer_lock);
777         return change;
778 }
779
780 static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0);
781
782 #define DUMMY_CAPSRC(xname, xindex, addr) \
783 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
784   .info = snd_dummy_capsrc_info, \
785   .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
786   .private_value = addr }
787
788 #define snd_dummy_capsrc_info   snd_ctl_boolean_stereo_info
789  
790 static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
791                                 struct snd_ctl_elem_value *ucontrol)
792 {
793         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
794         int addr = kcontrol->private_value;
795
796         spin_lock_irq(&dummy->mixer_lock);
797         ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
798         ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
799         spin_unlock_irq(&dummy->mixer_lock);
800         return 0;
801 }
802
803 static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
804 {
805         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
806         int change, addr = kcontrol->private_value;
807         int left, right;
808
809         left = ucontrol->value.integer.value[0] & 1;
810         right = ucontrol->value.integer.value[1] & 1;
811         spin_lock_irq(&dummy->mixer_lock);
812         change = dummy->capture_source[addr][0] != left &&
813                  dummy->capture_source[addr][1] != right;
814         dummy->capture_source[addr][0] = left;
815         dummy->capture_source[addr][1] = right;
816         spin_unlock_irq(&dummy->mixer_lock);
817         return change;
818 }
819
820 static struct snd_kcontrol_new snd_dummy_controls[] = {
821 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
822 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
823 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
824 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH),
825 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
826 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE),
827 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
828 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC),
829 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
830 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD)
831 };
832
833 static int __devinit snd_card_dummy_new_mixer(struct snd_dummy *dummy)
834 {
835         struct snd_card *card = dummy->card;
836         unsigned int idx;
837         int err;
838
839         spin_lock_init(&dummy->mixer_lock);
840         strcpy(card->mixername, "Dummy Mixer");
841
842         for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
843                 err = snd_ctl_add(card, snd_ctl_new1(&snd_dummy_controls[idx], dummy));
844                 if (err < 0)
845                         return err;
846         }
847         return 0;
848 }
849
850 #if defined(CONFIG_SND_DEBUG) && defined(CONFIG_PROC_FS)
851 /*
852  * proc interface
853  */
854 static void print_formats(struct snd_dummy *dummy,
855                           struct snd_info_buffer *buffer)
856 {
857         int i;
858
859         for (i = 0; i < SNDRV_PCM_FORMAT_LAST; i++) {
860                 if (dummy->pcm_hw.formats & (1ULL << i))
861                         snd_iprintf(buffer, " %s", snd_pcm_format_name(i));
862         }
863 }
864
865 static void print_rates(struct snd_dummy *dummy,
866                         struct snd_info_buffer *buffer)
867 {
868         static int rates[] = {
869                 5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000,
870                 64000, 88200, 96000, 176400, 192000,
871         };
872         int i;
873
874         if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_CONTINUOUS)
875                 snd_iprintf(buffer, " continuous");
876         if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_KNOT)
877                 snd_iprintf(buffer, " knot");
878         for (i = 0; i < ARRAY_SIZE(rates); i++)
879                 if (dummy->pcm_hw.rates & (1 << i))
880                         snd_iprintf(buffer, " %d", rates[i]);
881 }
882
883 #define get_dummy_int_ptr(dummy, ofs) \
884         (unsigned int *)((char *)&((dummy)->pcm_hw) + (ofs))
885 #define get_dummy_ll_ptr(dummy, ofs) \
886         (unsigned long long *)((char *)&((dummy)->pcm_hw) + (ofs))
887
888 struct dummy_hw_field {
889         const char *name;
890         const char *format;
891         unsigned int offset;
892         unsigned int size;
893 };
894 #define FIELD_ENTRY(item, fmt) {                   \
895         .name = #item,                             \
896         .format = fmt,                             \
897         .offset = offsetof(struct snd_pcm_hardware, item), \
898         .size = sizeof(dummy_pcm_hardware.item) }
899
900 static struct dummy_hw_field fields[] = {
901         FIELD_ENTRY(formats, "%#llx"),
902         FIELD_ENTRY(rates, "%#x"),
903         FIELD_ENTRY(rate_min, "%d"),
904         FIELD_ENTRY(rate_max, "%d"),
905         FIELD_ENTRY(channels_min, "%d"),
906         FIELD_ENTRY(channels_max, "%d"),
907         FIELD_ENTRY(buffer_bytes_max, "%ld"),
908         FIELD_ENTRY(period_bytes_min, "%ld"),
909         FIELD_ENTRY(period_bytes_max, "%ld"),
910         FIELD_ENTRY(periods_min, "%d"),
911         FIELD_ENTRY(periods_max, "%d"),
912 };
913
914 static void dummy_proc_read(struct snd_info_entry *entry,
915                             struct snd_info_buffer *buffer)
916 {
917         struct snd_dummy *dummy = entry->private_data;
918         int i;
919
920         for (i = 0; i < ARRAY_SIZE(fields); i++) {
921                 snd_iprintf(buffer, "%s ", fields[i].name);
922                 if (fields[i].size == sizeof(int))
923                         snd_iprintf(buffer, fields[i].format,
924                                 *get_dummy_int_ptr(dummy, fields[i].offset));
925                 else
926                         snd_iprintf(buffer, fields[i].format,
927                                 *get_dummy_ll_ptr(dummy, fields[i].offset));
928                 if (!strcmp(fields[i].name, "formats"))
929                         print_formats(dummy, buffer);
930                 else if (!strcmp(fields[i].name, "rates"))
931                         print_rates(dummy, buffer);
932                 snd_iprintf(buffer, "\n");
933         }
934 }
935
936 static void dummy_proc_write(struct snd_info_entry *entry,
937                              struct snd_info_buffer *buffer)
938 {
939         struct snd_dummy *dummy = entry->private_data;
940         char line[64];
941
942         while (!snd_info_get_line(buffer, line, sizeof(line))) {
943                 char item[20];
944                 const char *ptr;
945                 unsigned long long val;
946                 int i;
947
948                 ptr = snd_info_get_str(item, line, sizeof(item));
949                 for (i = 0; i < ARRAY_SIZE(fields); i++) {
950                         if (!strcmp(item, fields[i].name))
951                                 break;
952                 }
953                 if (i >= ARRAY_SIZE(fields))
954                         continue;
955                 snd_info_get_str(item, ptr, sizeof(item));
956                 if (strict_strtoull(item, 0, &val))
957                         continue;
958                 if (fields[i].size == sizeof(int))
959                         *get_dummy_int_ptr(dummy, fields[i].offset) = val;
960                 else
961                         *get_dummy_ll_ptr(dummy, fields[i].offset) = val;
962         }
963 }
964
965 static void __devinit dummy_proc_init(struct snd_dummy *chip)
966 {
967         struct snd_info_entry *entry;
968
969         if (!snd_card_proc_new(chip->card, "dummy_pcm", &entry)) {
970                 snd_info_set_text_ops(entry, chip, dummy_proc_read);
971                 entry->c.text.write = dummy_proc_write;
972                 entry->mode |= S_IWUSR;
973                 entry->private_data = chip;
974         }
975 }
976 #else
977 #define dummy_proc_init(x)
978 #endif /* CONFIG_SND_DEBUG && CONFIG_PROC_FS */
979
980 static int __devinit snd_dummy_probe(struct platform_device *devptr)
981 {
982         struct snd_card *card;
983         struct snd_dummy *dummy;
984         struct dummy_model *m = NULL, **mdl;
985         int idx, err;
986         int dev = devptr->id;
987
988         err = snd_card_create(index[dev], id[dev], THIS_MODULE,
989                               sizeof(struct snd_dummy), &card);
990         if (err < 0)
991                 return err;
992         dummy = card->private_data;
993         dummy->card = card;
994         for (mdl = dummy_models; *mdl && model[dev]; mdl++) {
995                 if (strcmp(model[dev], (*mdl)->name) == 0) {
996                         printk(KERN_INFO
997                                 "snd-dummy: Using model '%s' for card %i\n",
998                                 (*mdl)->name, card->number);
999                         m = dummy->model = *mdl;
1000                         break;
1001                 }
1002         }
1003         for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
1004                 if (pcm_substreams[dev] < 1)
1005                         pcm_substreams[dev] = 1;
1006                 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
1007                         pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
1008                 err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev]);
1009                 if (err < 0)
1010                         goto __nodev;
1011         }
1012
1013         dummy->pcm_hw = dummy_pcm_hardware;
1014         if (m) {
1015                 if (m->formats)
1016                         dummy->pcm_hw.formats = m->formats;
1017                 if (m->buffer_bytes_max)
1018                         dummy->pcm_hw.buffer_bytes_max = m->buffer_bytes_max;
1019                 if (m->period_bytes_min)
1020                         dummy->pcm_hw.period_bytes_min = m->period_bytes_min;
1021                 if (m->period_bytes_max)
1022                         dummy->pcm_hw.period_bytes_max = m->period_bytes_max;
1023                 if (m->periods_min)
1024                         dummy->pcm_hw.periods_min = m->periods_min;
1025                 if (m->periods_max)
1026                         dummy->pcm_hw.periods_max = m->periods_max;
1027                 if (m->rates)
1028                         dummy->pcm_hw.rates = m->rates;
1029                 if (m->rate_min)
1030                         dummy->pcm_hw.rate_min = m->rate_min;
1031                 if (m->rate_max)
1032                         dummy->pcm_hw.rate_max = m->rate_max;
1033                 if (m->channels_min)
1034                         dummy->pcm_hw.channels_min = m->channels_min;
1035                 if (m->channels_max)
1036                         dummy->pcm_hw.channels_max = m->channels_max;
1037         }
1038
1039         err = snd_card_dummy_new_mixer(dummy);
1040         if (err < 0)
1041                 goto __nodev;
1042         strcpy(card->driver, "Dummy");
1043         strcpy(card->shortname, "Dummy");
1044         sprintf(card->longname, "Dummy %i", dev + 1);
1045
1046         dummy_proc_init(dummy);
1047
1048         snd_card_set_dev(card, &devptr->dev);
1049
1050         err = snd_card_register(card);
1051         if (err == 0) {
1052                 platform_set_drvdata(devptr, card);
1053                 return 0;
1054         }
1055       __nodev:
1056         snd_card_free(card);
1057         return err;
1058 }
1059
1060 static int __devexit snd_dummy_remove(struct platform_device *devptr)
1061 {
1062         snd_card_free(platform_get_drvdata(devptr));
1063         platform_set_drvdata(devptr, NULL);
1064         return 0;
1065 }
1066
1067 #ifdef CONFIG_PM
1068 static int snd_dummy_suspend(struct platform_device *pdev, pm_message_t state)
1069 {
1070         struct snd_card *card = platform_get_drvdata(pdev);
1071         struct snd_dummy *dummy = card->private_data;
1072
1073         snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
1074         snd_pcm_suspend_all(dummy->pcm);
1075         return 0;
1076 }
1077         
1078 static int snd_dummy_resume(struct platform_device *pdev)
1079 {
1080         struct snd_card *card = platform_get_drvdata(pdev);
1081
1082         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
1083         return 0;
1084 }
1085 #endif
1086
1087 #define SND_DUMMY_DRIVER        "snd_dummy"
1088
1089 static struct platform_driver snd_dummy_driver = {
1090         .probe          = snd_dummy_probe,
1091         .remove         = __devexit_p(snd_dummy_remove),
1092 #ifdef CONFIG_PM
1093         .suspend        = snd_dummy_suspend,
1094         .resume         = snd_dummy_resume,
1095 #endif
1096         .driver         = {
1097                 .name   = SND_DUMMY_DRIVER
1098         },
1099 };
1100
1101 static void snd_dummy_unregister_all(void)
1102 {
1103         int i;
1104
1105         for (i = 0; i < ARRAY_SIZE(devices); ++i)
1106                 platform_device_unregister(devices[i]);
1107         platform_driver_unregister(&snd_dummy_driver);
1108         free_fake_buffer();
1109 }
1110
1111 static int __init alsa_card_dummy_init(void)
1112 {
1113         int i, cards, err;
1114
1115         err = platform_driver_register(&snd_dummy_driver);
1116         if (err < 0)
1117                 return err;
1118
1119         err = alloc_fake_buffer();
1120         if (err < 0) {
1121                 platform_driver_unregister(&snd_dummy_driver);
1122                 return err;
1123         }
1124
1125         cards = 0;
1126         for (i = 0; i < SNDRV_CARDS; i++) {
1127                 struct platform_device *device;
1128                 if (! enable[i])
1129                         continue;
1130                 device = platform_device_register_simple(SND_DUMMY_DRIVER,
1131                                                          i, NULL, 0);
1132                 if (IS_ERR(device))
1133                         continue;
1134                 if (!platform_get_drvdata(device)) {
1135                         platform_device_unregister(device);
1136                         continue;
1137                 }
1138                 devices[i] = device;
1139                 cards++;
1140         }
1141         if (!cards) {
1142 #ifdef MODULE
1143                 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
1144 #endif
1145                 snd_dummy_unregister_all();
1146                 return -ENODEV;
1147         }
1148         return 0;
1149 }
1150
1151 static void __exit alsa_card_dummy_exit(void)
1152 {
1153         snd_dummy_unregister_all();
1154 }
1155
1156 module_init(alsa_card_dummy_init)
1157 module_exit(alsa_card_dummy_exit)