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ALSA: hda - Fix pop noise in headphones on S3 for Asus X55A, X55V
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / sound / drivers / dummy.c
CommitLineData
1da177e4
LT		 1/*
2 * Dummy soundcard
c1017a4c 3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
1da177e4
LT		 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
1da177e4 21#include <linux/init.h>
6e65c1cc
TI		 22#include <linux/err.h>
23#include <linux/platform_device.h>
1da177e4
LT		 24#include <linux/jiffies.h>
25#include <linux/slab.h>
26#include <linux/time.h>
27#include <linux/wait.h>
c631d03c
TI		 28#include <linux/hrtimer.h>
29#include <linux/math64.h>
65a77217 30#include <linux/module.h>
1da177e4
LT		 31#include <sound/core.h>
32#include <sound/control.h>
fb567a8e 33#include <sound/tlv.h>
1da177e4
LT		 34#include <sound/pcm.h>
35#include <sound/rawmidi.h>
9b151fec 36#include <sound/info.h>
1da177e4
LT		 37#include <sound/initval.h>
38
c1017a4c 39MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
1da177e4
LT		 40MODULE_DESCRIPTION("Dummy soundcard (/dev/null)");
41MODULE_LICENSE("GPL");
42MODULE_SUPPORTED_DEVICE("{{ALSA,Dummy soundcard}}");
43
44#define MAX_PCM_DEVICES 4
b888d1ce 45#define MAX_PCM_SUBSTREAMS 128
1da177e4
LT		 46#define MAX_MIDI_DEVICES 2
47
1da177e4 48/* defaults */
1da177e4 49#define MAX_BUFFER_SIZE (64*1024)
d5e1ca05 50#define MIN_PERIOD_SIZE 64
2ad5dd8d 51#define MAX_PERIOD_SIZE MAX_BUFFER_SIZE
1da177e4 52#define USE_FORMATS (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE)
1da177e4
LT		 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
1da177e4 56#define USE_CHANNELS_MIN 1
1da177e4 57#define USE_CHANNELS_MAX 2
1da177e4 58#define USE_PERIODS_MIN 1
1da177e4 59#define USE_PERIODS_MAX 1024
1da177e4
LT		 60
61static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
62static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
a67ff6a5 63static bool enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
d5e1ca05 64static char *model[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = NULL};
1da177e4
LT		 65static int pcm_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
66static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8};
67//static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 2};
c631d03c 68#ifdef CONFIG_HIGH_RES_TIMERS
a67ff6a5 69static bool hrtimer = 1;
c631d03c 70#endif
a67ff6a5 71static bool fake_buffer = 1;
1da177e4
LT		 72
73module_param_array(index, int, NULL, 0444);
74MODULE_PARM_DESC(index, "Index value for dummy soundcard.");
75module_param_array(id, charp, NULL, 0444);
76MODULE_PARM_DESC(id, "ID string for dummy soundcard.");
77module_param_array(enable, bool, NULL, 0444);
78MODULE_PARM_DESC(enable, "Enable this dummy soundcard.");
d5e1ca05
JK		 79module_param_array(model, charp, NULL, 0444);
80MODULE_PARM_DESC(model, "Soundcard model.");
1da177e4
LT		 81module_param_array(pcm_devs, int, NULL, 0444);
82MODULE_PARM_DESC(pcm_devs, "PCM devices # (0-4) for dummy driver.");
83module_param_array(pcm_substreams, int, NULL, 0444);
23aebca4 84MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-128) for dummy driver.");
1da177e4
LT		 85//module_param_array(midi_devs, int, NULL, 0444);
86//MODULE_PARM_DESC(midi_devs, "MIDI devices # (0-2) for dummy driver.");
a68c4d11
TI		 87module_param(fake_buffer, bool, 0444);
88MODULE_PARM_DESC(fake_buffer, "Fake buffer allocations.");
c631d03c
TI		 89#ifdef CONFIG_HIGH_RES_TIMERS
90module_param(hrtimer, bool, 0644);
91MODULE_PARM_DESC(hrtimer, "Use hrtimer as the timer source.");
92#endif
1da177e4 93
f7a9275d
CL		 94static struct platform_device *devices[SNDRV_CARDS];
95
1da177e4
LT		 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
c631d03c
TI		 103struct 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
d5e1ca05
JK		 112struct 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
4a4d2cfd
TI		 129struct snd_dummy {
130 struct snd_card *card;
d5e1ca05 131 struct dummy_model *model;
6e65c1cc 132 struct snd_pcm *pcm;
d5e1ca05 133 struct snd_pcm_hardware pcm_hw;
1da177e4
LT		 134 spinlock_t mixer_lock;
135 int mixer_volume[MIXER_ADDR_LAST+1][2];
136 int capture_source[MIXER_ADDR_LAST+1][2];
c631d03c 137 const struct dummy_timer_ops *timer_ops;
4a4d2cfd 138};
1da177e4 139
d5e1ca05
JK		 140/*
141 * card models
142 */
143
144static 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
156struct dummy_model model_emu10k1 = {
157 .name = "emu10k1",
158 .playback_constraints = emu10k1_playback_constraints,
159 .buffer_bytes_max = 128 * 1024,
160};
161
162struct 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
172struct 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
182struct 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
192struct 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
202struct 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
216struct 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
c631d03c
TI		 226/*
227 * system timer interface
228 */
229
230struct dummy_systimer_pcm {
1da177e4
LT		 231 spinlock_t lock;
232 struct timer_list timer;
b142037b
TI		 233 unsigned long base_time;
234 unsigned int frac_pos; /* fractional sample position (based HZ) */
b5d10781 235 unsigned int frac_period_rest;
b142037b
TI		 236 unsigned int frac_buffer_size; /* buffer_size * HZ */
237 unsigned int frac_period_size; /* period_size * HZ */
238 unsigned int rate;
b5d10781 239 int elapsed;
4a4d2cfd
TI		 240 struct snd_pcm_substream *substream;
241};
1da177e4 242
b142037b
TI		 243static void dummy_systimer_rearm(struct dummy_systimer_pcm *dpcm)
244{
b142037b 245 dpcm->timer.expires = jiffies +
b5d10781 246 (dpcm->frac_period_rest + dpcm->rate - 1) / dpcm->rate;
b142037b
TI		 247 add_timer(&dpcm->timer);
248}
249
250static 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;
b5d10781
TI		 257 dpcm->base_time += delta;
258 delta *= dpcm->rate;
259 dpcm->frac_pos += delta;
b142037b
TI		 260 while (dpcm->frac_pos >= dpcm->frac_buffer_size)
261 dpcm->frac_pos -= dpcm->frac_buffer_size;
b5d10781
TI		 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;
b142037b
TI		 267}
268
c631d03c 269static int dummy_systimer_start(struct snd_pcm_substream *substream)
1da177e4 270{
c631d03c
TI		 271 struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
272 spin_lock(&dpcm->lock);
b142037b
TI		 273 dpcm->base_time = jiffies;
274 dummy_systimer_rearm(dpcm);
c631d03c
TI		 275 spin_unlock(&dpcm->lock);
276 return 0;
1da177e4
LT		 277}
278
c631d03c 279static int dummy_systimer_stop(struct snd_pcm_substream *substream)
1da177e4 280{
c631d03c 281 struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
c8eb6ba1 282 spin_lock(&dpcm->lock);
c631d03c 283 del_timer(&dpcm->timer);
c8eb6ba1 284 spin_unlock(&dpcm->lock);
6e65c1cc 285 return 0;
1da177e4
LT		 286}
287
c631d03c 288static int dummy_systimer_prepare(struct snd_pcm_substream *substream)
1da177e4 289{
4a4d2cfd 290 struct snd_pcm_runtime *runtime = substream->runtime;
c631d03c 291 struct dummy_systimer_pcm *dpcm = runtime->private_data;
369b240d 292
b142037b
TI		 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;
b5d10781
TI		 297 dpcm->frac_period_rest = dpcm->frac_period_size;
298 dpcm->elapsed = 0;
53463a83 299
1da177e4
LT		 300 return 0;
301}
302
c631d03c 303static void dummy_systimer_callback(unsigned long data)
1da177e4 304{
c631d03c 305 struct dummy_systimer_pcm *dpcm = (struct dummy_systimer_pcm *)data;
b32425ac 306 unsigned long flags;
b5d10781 307 int elapsed = 0;
1da177e4 308
b32425ac 309 spin_lock_irqsave(&dpcm->lock, flags);
b142037b
TI		 310 dummy_systimer_update(dpcm);
311 dummy_systimer_rearm(dpcm);
b5d10781
TI		 312 elapsed = dpcm->elapsed;
313 dpcm->elapsed = 0;
b142037b 314 spin_unlock_irqrestore(&dpcm->lock, flags);
b5d10781
TI		 315 if (elapsed)
316 snd_pcm_period_elapsed(dpcm->substream);
1da177e4
LT		 317}
318
c631d03c
TI		 319static snd_pcm_uframes_t
320dummy_systimer_pointer(struct snd_pcm_substream *substream)
1da177e4 321{
b142037b 322 struct dummy_systimer_pcm *dpcm = substream->runtime->private_data;
b5d10781 323 snd_pcm_uframes_t pos;
1da177e4 324
b142037b
TI		 325 spin_lock(&dpcm->lock);
326 dummy_systimer_update(dpcm);
b5d10781 327 pos = dpcm->frac_pos / HZ;
b142037b 328 spin_unlock(&dpcm->lock);
b5d10781 329 return pos;
1da177e4
LT		 330}
331
c631d03c 332static int dummy_systimer_create(struct snd_pcm_substream *substream)
1da177e4 333{
c631d03c
TI		 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
348static void dummy_systimer_free(struct snd_pcm_substream *substream)
349{
350 kfree(substream->runtime->private_data);
351}
352
353static 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,
1da177e4
LT		 360};
361
c631d03c
TI		 362#ifdef CONFIG_HIGH_RES_TIMERS
363/*
364 * hrtimer interface
365 */
366
367struct 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
376static 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
383static 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
395static 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
405static 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
414static inline void dummy_hrtimer_sync(struct dummy_hrtimer_pcm *dpcm)
415{
416 tasklet_kill(&dpcm->tasklet);
417}
418
419static snd_pcm_uframes_t
420dummy_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
434static int dummy_hrtimer_prepare(struct snd_pcm_substream *substream)
1da177e4 435{
c631d03c
TI		 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
453static 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
470static 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
477static 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
492static 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
507static int dummy_pcm_prepare(struct snd_pcm_substream *substream)
508{
c631d03c
TI		 509 struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
510
c631d03c
TI		 511 return dummy->timer_ops->prepare(substream);
512}
513
514static 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
521static 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),
1da177e4
LT		 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,
d5e1ca05 533 .period_bytes_min = MIN_PERIOD_SIZE,
2ad5dd8d 534 .period_bytes_max = MAX_PERIOD_SIZE,
1da177e4
LT		 535 .periods_min = USE_PERIODS_MIN,
536 .periods_max = USE_PERIODS_MAX,
537 .fifo_size = 0,
538};
539
c631d03c
TI		 540static int dummy_pcm_hw_params(struct snd_pcm_substream *substream,
541 struct snd_pcm_hw_params *hw_params)
1da177e4 542{
a68c4d11
TI		 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 }
c631d03c
TI		 548 return snd_pcm_lib_malloc_pages(substream,
549 params_buffer_bytes(hw_params));
1da177e4
LT		 550}
551
c631d03c 552static int dummy_pcm_hw_free(struct snd_pcm_substream *substream)
1da177e4 553{
a68c4d11
TI		 554 if (fake_buffer)
555 return 0;
1da177e4
LT		 556 return snd_pcm_lib_free_pages(substream);
557}
558
c631d03c 559static int dummy_pcm_open(struct snd_pcm_substream *substream)
c8eb6ba1 560{
c631d03c 561 struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
d5e1ca05 562 struct dummy_model *model = dummy->model;
4a4d2cfd 563 struct snd_pcm_runtime *runtime = substream->runtime;
c8eb6ba1
TI		 564 int err;
565
c631d03c
TI		 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);
1a11cb64 573 if (err < 0)
1da177e4 574 return err;
1da177e4 575
d5e1ca05 576 runtime->hw = dummy->pcm_hw;
c631d03c 577 if (substream->pcm->device & 1) {
1da177e4
LT		 578 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
579 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
580 }
581 if (substream->pcm->device & 2)
c631d03c
TI		 582 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP |
583 SNDRV_PCM_INFO_MMAP_VALID);
584
d5e1ca05
JK		 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 }
c631d03c
TI		 595 if (err < 0) {
596 dummy->timer_ops->free(substream);
1da177e4 597 return err;
c631d03c 598 }
1da177e4
LT		 599 return 0;
600}
601
c631d03c 602static int dummy_pcm_close(struct snd_pcm_substream *substream)
1da177e4 603{
c631d03c
TI		 604 struct snd_dummy *dummy = snd_pcm_substream_chip(substream);
605 dummy->timer_ops->free(substream);
1da177e4
LT		 606 return 0;
607}
608
a68c4d11
TI		 609/*
610 * dummy buffer handling
611 */
612
613static void *dummy_page[2];
614
615static 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
627static 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
643static 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
650static 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
657static 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
c631d03c
TI		 663static 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,
1da177e4
LT		 672};
673
a68c4d11
TI		 674static 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
788c6043
PB		 688static int __devinit snd_card_dummy_pcm(struct snd_dummy *dummy, int device,
689 int substreams)
1da177e4 690{
4a4d2cfd 691 struct snd_pcm *pcm;
a68c4d11 692 struct snd_pcm_ops *ops;
1da177e4
LT		 693 int err;
694
1a11cb64
JK		 695 err = snd_pcm_new(dummy->card, "Dummy PCM", device,
696 substreams, substreams, &pcm);
697 if (err < 0)
1da177e4 698 return err;
6e65c1cc 699 dummy->pcm = pcm;
a68c4d11
TI		 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);
1da177e4
LT		 706 pcm->private_data = dummy;
707 pcm->info_flags = 0;
708 strcpy(pcm->name, "Dummy PCM");
a68c4d11
TI		 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 }
1da177e4
LT		 715 return 0;
716}
717
9b151fec
TI		 718/*
719 * mixer interface
720 */
721
1da177e4 722#define DUMMY_VOLUME(xname, xindex, addr) \
fb567a8e
TI		 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, \
1da177e4
LT		 726 .info = snd_dummy_volume_info, \
727 .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
fb567a8e
TI		 728 .private_value = addr, \
729 .tlv = { .p = db_scale_dummy } }
1da177e4 730
4a4d2cfd
TI		 731static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
732 struct snd_ctl_elem_info *uinfo)
1da177e4
LT		 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
4a4d2cfd
TI		 741static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
742 struct snd_ctl_elem_value *ucontrol)
1da177e4 743{
4a4d2cfd 744 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
1da177e4
LT		 745 int addr = kcontrol->private_value;
746
c8eb6ba1 747 spin_lock_irq(&dummy->mixer_lock);
1da177e4
LT		 748 ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
749 ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
c8eb6ba1 750 spin_unlock_irq(&dummy->mixer_lock);
1da177e4
LT		 751 return 0;
752}
753
4a4d2cfd
TI		 754static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
755 struct snd_ctl_elem_value *ucontrol)
1da177e4 756{
4a4d2cfd 757 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
1da177e4
LT		 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;
c8eb6ba1 771 spin_lock_irq(&dummy->mixer_lock);
1da177e4
LT		 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;
c8eb6ba1 776 spin_unlock_irq(&dummy->mixer_lock);
1da177e4
LT		 777 return change;
778}
779
0cb29ea0 780static const DECLARE_TLV_DB_SCALE(db_scale_dummy, -4500, 30, 0);
fb567a8e 781
1da177e4
LT		 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
a5ce8890 788#define snd_dummy_capsrc_info snd_ctl_boolean_stereo_info
1da177e4 789
4a4d2cfd
TI		 790static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
791 struct snd_ctl_elem_value *ucontrol)
1da177e4 792{
4a4d2cfd 793 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
1da177e4
LT		 794 int addr = kcontrol->private_value;
795
c8eb6ba1 796 spin_lock_irq(&dummy->mixer_lock);
1da177e4
LT		 797 ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
798 ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
c8eb6ba1 799 spin_unlock_irq(&dummy->mixer_lock);
1da177e4
LT		 800 return 0;
801}
802
4a4d2cfd 803static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
1da177e4 804{
4a4d2cfd 805 struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
1da177e4
LT		 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;
c8eb6ba1 811 spin_lock_irq(&dummy->mixer_lock);
1da177e4
LT		 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;
c8eb6ba1 816 spin_unlock_irq(&dummy->mixer_lock);
1da177e4
LT		 817 return change;
818}
819
4a4d2cfd 820static struct snd_kcontrol_new snd_dummy_controls[] = {
1da177e4
LT		 821DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
822DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
823DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
e05d6964 824DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_SYNTH),
1da177e4 825DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
e05d6964 826DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_LINE),
1da177e4 827DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
e05d6964 828DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MIC),
1da177e4 829DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
e05d6964 830DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_CD)
1da177e4
LT		 831};
832
788c6043 833static int __devinit snd_card_dummy_new_mixer(struct snd_dummy *dummy)
1da177e4 834{
4a4d2cfd 835 struct snd_card *card = dummy->card;
1da177e4
LT		 836 unsigned int idx;
837 int err;
838
1da177e4
LT		 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++) {
1a11cb64
JK		 843 err = snd_ctl_add(card, snd_ctl_new1(&snd_dummy_controls[idx], dummy));
844 if (err < 0)
1da177e4
LT		 845 return err;
846 }
847 return 0;
848}
849
9b151fec
TI		 850#if defined(CONFIG_SND_DEBUG) && defined(CONFIG_PROC_FS)
851/*
852 * proc interface
853 */
d5e1ca05
JK		 854static void print_formats(struct snd_dummy *dummy,
855 struct snd_info_buffer *buffer)
9b151fec
TI		 856{
857 int i;
858
859 for (i = 0; i < SNDRV_PCM_FORMAT_LAST; i++) {
d5e1ca05 860 if (dummy->pcm_hw.formats & (1ULL << i))
9b151fec
TI		 861 snd_iprintf(buffer, " %s", snd_pcm_format_name(i));
862 }
863}
864
d5e1ca05
JK		 865static void print_rates(struct snd_dummy *dummy,
866 struct snd_info_buffer *buffer)
9b151fec
TI		 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
d5e1ca05 874 if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_CONTINUOUS)
9b151fec 875 snd_iprintf(buffer, " continuous");
d5e1ca05 876 if (dummy->pcm_hw.rates & SNDRV_PCM_RATE_KNOT)
9b151fec
TI		 877 snd_iprintf(buffer, " knot");
878 for (i = 0; i < ARRAY_SIZE(rates); i++)
d5e1ca05 879 if (dummy->pcm_hw.rates & (1 << i))
9b151fec
TI		 880 snd_iprintf(buffer, " %d", rates[i]);
881}
882
d5e1ca05
JK		 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))
9b151fec
TI		 887
888struct 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
900static 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
914static void dummy_proc_read(struct snd_info_entry *entry,
915 struct snd_info_buffer *buffer)
916{
d5e1ca05 917 struct snd_dummy *dummy = entry->private_data;
9b151fec
TI		 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,
d5e1ca05 924 *get_dummy_int_ptr(dummy, fields[i].offset));
9b151fec
TI		 925 else
926 snd_iprintf(buffer, fields[i].format,
d5e1ca05 927 *get_dummy_ll_ptr(dummy, fields[i].offset));
9b151fec 928 if (!strcmp(fields[i].name, "formats"))
d5e1ca05 929 print_formats(dummy, buffer);
9b151fec 930 else if (!strcmp(fields[i].name, "rates"))
d5e1ca05 931 print_rates(dummy, buffer);
9b151fec
TI		 932 snd_iprintf(buffer, "\n");
933 }
934}
935
936static void dummy_proc_write(struct snd_info_entry *entry,
937 struct snd_info_buffer *buffer)
938{
d5e1ca05 939 struct snd_dummy *dummy = entry->private_data;
9b151fec
TI		 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))
d5e1ca05 959 *get_dummy_int_ptr(dummy, fields[i].offset) = val;
9b151fec 960 else
d5e1ca05 961 *get_dummy_ll_ptr(dummy, fields[i].offset) = val;
9b151fec
TI		 962 }
963}
964
965static 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;
d5e1ca05 973 entry->private_data = chip;
9b151fec
TI		 974 }
975}
976#else
977#define dummy_proc_init(x)
978#endif /* CONFIG_SND_DEBUG && CONFIG_PROC_FS */
979
788c6043 980static int __devinit snd_dummy_probe(struct platform_device *devptr)
1da177e4 981{
4a4d2cfd
TI		 982 struct snd_card *card;
983 struct snd_dummy *dummy;
d5e1ca05 984 struct dummy_model *m = NULL, **mdl;
1da177e4 985 int idx, err;
6e65c1cc 986 int dev = devptr->id;
1da177e4 987
bd7dd77c
TI		 988 err = snd_card_create(index[dev], id[dev], THIS_MODULE,
989 sizeof(struct snd_dummy), &card);
990 if (err < 0)
991 return err;
4a4d2cfd 992 dummy = card->private_data;
1da177e4 993 dummy->card = card;
d5e1ca05
JK		 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 }
1da177e4
LT		 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;
1a11cb64
JK		 1008 err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev]);
1009 if (err < 0)
1da177e4
LT		 1010 goto __nodev;
1011 }
d5e1ca05
JK		 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
1a11cb64
JK		 1039 err = snd_card_dummy_new_mixer(dummy);
1040 if (err < 0)
1da177e4
LT		 1041 goto __nodev;
1042 strcpy(card->driver, "Dummy");
1043 strcpy(card->shortname, "Dummy");
1044 sprintf(card->longname, "Dummy %i", dev + 1);
16dab54b 1045
9b151fec
TI		 1046 dummy_proc_init(dummy);
1047
6e65c1cc 1048 snd_card_set_dev(card, &devptr->dev);
16dab54b 1049
1a11cb64
JK		 1050 err = snd_card_register(card);
1051 if (err == 0) {
6e65c1cc 1052 platform_set_drvdata(devptr, card);
1da177e4
LT		 1053 return 0;
1054 }
1055 __nodev:
1056 snd_card_free(card);
1057 return err;
1058}
1059
788c6043 1060static int __devexit snd_dummy_remove(struct platform_device *devptr)
6e65c1cc
TI		 1061{
1062 snd_card_free(platform_get_drvdata(devptr));
1063 platform_set_drvdata(devptr, NULL);
1064 return 0;
1065}
1066
1067#ifdef CONFIG_PM
284e7ca7 1068static int snd_dummy_suspend(struct device *pdev)
1da177e4 1069{
284e7ca7 1070 struct snd_card *card = dev_get_drvdata(pdev);
6e65c1cc 1071 struct snd_dummy *dummy = card->private_data;
1da177e4 1072
6e65c1cc
TI		 1073 snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
1074 snd_pcm_suspend_all(dummy->pcm);
1075 return 0;
1076}
1077
284e7ca7 1078static int snd_dummy_resume(struct device *pdev)
6e65c1cc 1079{
284e7ca7 1080 struct snd_card *card = dev_get_drvdata(pdev);
6e65c1cc
TI		 1081
1082 snd_power_change_state(card, SNDRV_CTL_POWER_D0);
1083 return 0;
1084}
284e7ca7
TI		 1085
1086static SIMPLE_DEV_PM_OPS(snd_dummy_pm, snd_dummy_suspend, snd_dummy_resume);
1087#define SND_DUMMY_PM_OPS &snd_dummy_pm
1088#else
1089#define SND_DUMMY_PM_OPS NULL
6e65c1cc
TI		 1090#endif
1091
1092#define SND_DUMMY_DRIVER "snd_dummy"
1093
1094static struct platform_driver snd_dummy_driver = {
1095 .probe = snd_dummy_probe,
788c6043 1096 .remove = __devexit_p(snd_dummy_remove),
6e65c1cc 1097 .driver = {
8bf01d8a
TI		 1098 .name = SND_DUMMY_DRIVER,
1099 .owner = THIS_MODULE,
284e7ca7 1100 .pm = SND_DUMMY_PM_OPS,
6e65c1cc
TI		 1101 },
1102};
1103
c12aad6e 1104static void snd_dummy_unregister_all(void)
f7a9275d
CL		 1105{
1106 int i;
1107
1108 for (i = 0; i < ARRAY_SIZE(devices); ++i)
1109 platform_device_unregister(devices[i]);
1110 platform_driver_unregister(&snd_dummy_driver);
a68c4d11 1111 free_fake_buffer();
f7a9275d
CL		 1112}
1113
6e65c1cc
TI		 1114static int __init alsa_card_dummy_init(void)
1115{
1116 int i, cards, err;
1117
1a11cb64
JK		 1118 err = platform_driver_register(&snd_dummy_driver);
1119 if (err < 0)
6e65c1cc
TI		 1120 return err;
1121
a68c4d11
TI		 1122 err = alloc_fake_buffer();
1123 if (err < 0) {
1124 platform_driver_unregister(&snd_dummy_driver);
1125 return err;
1126 }
1127
6e65c1cc 1128 cards = 0;
8278ca8f 1129 for (i = 0; i < SNDRV_CARDS; i++) {
6e65c1cc 1130 struct platform_device *device;
8278ca8f
TI		 1131 if (! enable[i])
1132 continue;
6e65c1cc
TI		 1133 device = platform_device_register_simple(SND_DUMMY_DRIVER,
1134 i, NULL, 0);
a182ee98
RH		 1135 if (IS_ERR(device))
1136 continue;
7152447d
RH		 1137 if (!platform_get_drvdata(device)) {
1138 platform_device_unregister(device);
1139 continue;
1140 }
f7a9275d 1141 devices[i] = device;
1da177e4
LT		 1142 cards++;
1143 }
1144 if (!cards) {
1145#ifdef MODULE
1146 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
1147#endif
a182ee98
RH		 1148 snd_dummy_unregister_all();
1149 return -ENODEV;
1da177e4
LT		 1150 }
1151 return 0;
1152}
1153
1154static void __exit alsa_card_dummy_exit(void)
1155{
f7a9275d 1156 snd_dummy_unregister_all();
1da177e4
LT		 1157}
1158
1159module_init(alsa_card_dummy_init)
1160module_exit(alsa_card_dummy_exit)
kernel source for telekom puls (alcatel/mediatek)