[PATCH] shmat: stop mprotect from giving write permission to a readonly attachment...
[linux-2.6.git] / sound / drivers / dummy.c
1 /*
2  *  Dummy soundcard
3  *  Copyright (c) by Jaroslav Kysela <perex@suse.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 <sound/driver.h>
22 #include <linux/init.h>
23 #include <linux/err.h>
24 #include <linux/platform_device.h>
25 #include <linux/jiffies.h>
26 #include <linux/slab.h>
27 #include <linux/time.h>
28 #include <linux/wait.h>
29 #include <linux/moduleparam.h>
30 #include <sound/core.h>
31 #include <sound/control.h>
32 #include <sound/pcm.h>
33 #include <sound/rawmidi.h>
34 #include <sound/initval.h>
35
36 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
37 MODULE_DESCRIPTION("Dummy soundcard (/dev/null)");
38 MODULE_LICENSE("GPL");
39 MODULE_SUPPORTED_DEVICE("{{ALSA,Dummy soundcard}}");
40
41 #define MAX_PCM_DEVICES         4
42 #define MAX_PCM_SUBSTREAMS      16
43 #define MAX_MIDI_DEVICES        2
44
45 #if 0 /* emu10k1 emulation */
46 #define MAX_BUFFER_SIZE         (128 * 1024)
47 static int emu10k1_playback_constraints(struct snd_pcm_runtime *runtime)
48 {
49         int err;
50         if ((err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
51                 return err;
52         if ((err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256, UINT_MAX)) < 0)
53                 return err;
54         return 0;
55 }
56 #define add_playback_constraints emu10k1_playback_constraints
57 #endif
58
59 #if 0 /* RME9652 emulation */
60 #define MAX_BUFFER_SIZE         (26 * 64 * 1024)
61 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S32_LE
62 #define USE_CHANNELS_MIN        26
63 #define USE_CHANNELS_MAX        26
64 #define USE_PERIODS_MIN         2
65 #define USE_PERIODS_MAX         2
66 #endif
67
68 #if 0 /* ICE1712 emulation */
69 #define MAX_BUFFER_SIZE         (256 * 1024)
70 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S32_LE
71 #define USE_CHANNELS_MIN        10
72 #define USE_CHANNELS_MAX        10
73 #define USE_PERIODS_MIN         1
74 #define USE_PERIODS_MAX         1024
75 #endif
76
77 #if 0 /* UDA1341 emulation */
78 #define MAX_BUFFER_SIZE         (16380)
79 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S16_LE
80 #define USE_CHANNELS_MIN        2
81 #define USE_CHANNELS_MAX        2
82 #define USE_PERIODS_MIN         2
83 #define USE_PERIODS_MAX         255
84 #endif
85
86 #if 0 /* simple AC97 bridge (intel8x0) with 48kHz AC97 only codec */
87 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S16_LE
88 #define USE_CHANNELS_MIN        2
89 #define USE_CHANNELS_MAX        2
90 #define USE_RATE                SNDRV_PCM_RATE_48000
91 #define USE_RATE_MIN            48000
92 #define USE_RATE_MAX            48000
93 #endif
94
95 #if 0 /* CA0106 */
96 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S16_LE
97 #define USE_CHANNELS_MIN        2
98 #define USE_CHANNELS_MAX        2
99 #define USE_RATE                (SNDRV_PCM_RATE_48000|SNDRV_PCM_RATE_96000|SNDRV_PCM_RATE_192000) 
100 #define USE_RATE_MIN            48000 
101 #define USE_RATE_MAX            192000
102 #define MAX_BUFFER_SIZE         ((65536-64)*8)
103 #define MAX_PERIOD_SIZE         (65536-64)
104 #define USE_PERIODS_MIN         2
105 #define USE_PERIODS_MAX         8
106 #endif
107
108
109 /* defaults */
110 #ifndef MAX_BUFFER_SIZE
111 #define MAX_BUFFER_SIZE         (64*1024)
112 #endif
113 #ifndef MAX_PERIOD_SIZE
114 #define MAX_PERIOD_SIZE         MAX_BUFFER_SIZE
115 #endif
116 #ifndef USE_FORMATS
117 #define USE_FORMATS             (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE)
118 #endif
119 #ifndef USE_RATE
120 #define USE_RATE                SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000
121 #define USE_RATE_MIN            5500
122 #define USE_RATE_MAX            48000
123 #endif
124 #ifndef USE_CHANNELS_MIN
125 #define USE_CHANNELS_MIN        1
126 #endif
127 #ifndef USE_CHANNELS_MAX
128 #define USE_CHANNELS_MAX        2
129 #endif
130 #ifndef USE_PERIODS_MIN
131 #define USE_PERIODS_MIN         1
132 #endif
133 #ifndef USE_PERIODS_MAX
134 #define USE_PERIODS_MAX         1024
135 #endif
136 #ifndef add_playback_constraints
137 #define add_playback_constraints(x) 0
138 #endif
139 #ifndef add_capture_constraints
140 #define add_capture_constraints(x) 0
141 #endif
142
143 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
144 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
145 static int enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
146 static int pcm_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
147 static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8};
148 //static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 2};
149
150 module_param_array(index, int, NULL, 0444);
151 MODULE_PARM_DESC(index, "Index value for dummy soundcard.");
152 module_param_array(id, charp, NULL, 0444);
153 MODULE_PARM_DESC(id, "ID string for dummy soundcard.");
154 module_param_array(enable, bool, NULL, 0444);
155 MODULE_PARM_DESC(enable, "Enable this dummy soundcard.");
156 module_param_array(pcm_devs, int, NULL, 0444);
157 MODULE_PARM_DESC(pcm_devs, "PCM devices # (0-4) for dummy driver.");
158 module_param_array(pcm_substreams, int, NULL, 0444);
159 MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-16) for dummy driver.");
160 //module_param_array(midi_devs, int, NULL, 0444);
161 //MODULE_PARM_DESC(midi_devs, "MIDI devices # (0-2) for dummy driver.");
162
163 static struct platform_device *devices[SNDRV_CARDS];
164
165 #define MIXER_ADDR_MASTER       0
166 #define MIXER_ADDR_LINE         1
167 #define MIXER_ADDR_MIC          2
168 #define MIXER_ADDR_SYNTH        3
169 #define MIXER_ADDR_CD           4
170 #define MIXER_ADDR_LAST         4
171
172 struct snd_dummy {
173         struct snd_card *card;
174         struct snd_pcm *pcm;
175         spinlock_t mixer_lock;
176         int mixer_volume[MIXER_ADDR_LAST+1][2];
177         int capture_source[MIXER_ADDR_LAST+1][2];
178 };
179
180 struct snd_dummy_pcm {
181         struct snd_dummy *dummy;
182         spinlock_t lock;
183         struct timer_list timer;
184         unsigned int pcm_size;
185         unsigned int pcm_count;
186         unsigned int pcm_bps;           /* bytes per second */
187         unsigned int pcm_jiffie;        /* bytes per one jiffie */
188         unsigned int pcm_irq_pos;       /* IRQ position */
189         unsigned int pcm_buf_pos;       /* position in buffer */
190         struct snd_pcm_substream *substream;
191 };
192
193
194 static inline void snd_card_dummy_pcm_timer_start(struct snd_dummy_pcm *dpcm)
195 {
196         dpcm->timer.expires = 1 + jiffies;
197         add_timer(&dpcm->timer);
198 }
199
200 static inline void snd_card_dummy_pcm_timer_stop(struct snd_dummy_pcm *dpcm)
201 {
202         del_timer(&dpcm->timer);
203 }
204
205 static int snd_card_dummy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
206 {
207         struct snd_pcm_runtime *runtime = substream->runtime;
208         struct snd_dummy_pcm *dpcm = runtime->private_data;
209         int err = 0;
210
211         spin_lock(&dpcm->lock);
212         switch (cmd) {
213         case SNDRV_PCM_TRIGGER_START:
214         case SNDRV_PCM_TRIGGER_RESUME:
215                 snd_card_dummy_pcm_timer_start(dpcm);
216                 break;
217         case SNDRV_PCM_TRIGGER_STOP:
218         case SNDRV_PCM_TRIGGER_SUSPEND:
219                 snd_card_dummy_pcm_timer_stop(dpcm);
220                 break;
221         default:
222                 err = -EINVAL;
223                 break;
224         }
225         spin_unlock(&dpcm->lock);
226         return 0;
227 }
228
229 static int snd_card_dummy_pcm_prepare(struct snd_pcm_substream *substream)
230 {
231         struct snd_pcm_runtime *runtime = substream->runtime;
232         struct snd_dummy_pcm *dpcm = runtime->private_data;
233         unsigned int bps;
234
235         bps = runtime->rate * runtime->channels;
236         bps *= snd_pcm_format_width(runtime->format);
237         bps /= 8;
238         if (bps <= 0)
239                 return -EINVAL;
240         dpcm->pcm_bps = bps;
241         dpcm->pcm_jiffie = bps / HZ;
242         dpcm->pcm_size = snd_pcm_lib_buffer_bytes(substream);
243         dpcm->pcm_count = snd_pcm_lib_period_bytes(substream);
244         dpcm->pcm_irq_pos = 0;
245         dpcm->pcm_buf_pos = 0;
246         return 0;
247 }
248
249 static void snd_card_dummy_pcm_timer_function(unsigned long data)
250 {
251         struct snd_dummy_pcm *dpcm = (struct snd_dummy_pcm *)data;
252         unsigned long flags;
253         
254         spin_lock_irqsave(&dpcm->lock, flags);
255         dpcm->timer.expires = 1 + jiffies;
256         add_timer(&dpcm->timer);
257         dpcm->pcm_irq_pos += dpcm->pcm_jiffie;
258         dpcm->pcm_buf_pos += dpcm->pcm_jiffie;
259         dpcm->pcm_buf_pos %= dpcm->pcm_size;
260         if (dpcm->pcm_irq_pos >= dpcm->pcm_count) {
261                 dpcm->pcm_irq_pos %= dpcm->pcm_count;
262                 spin_unlock_irqrestore(&dpcm->lock, flags);
263                 snd_pcm_period_elapsed(dpcm->substream);
264         } else
265                 spin_unlock_irqrestore(&dpcm->lock, flags);
266 }
267
268 static snd_pcm_uframes_t snd_card_dummy_pcm_pointer(struct snd_pcm_substream *substream)
269 {
270         struct snd_pcm_runtime *runtime = substream->runtime;
271         struct snd_dummy_pcm *dpcm = runtime->private_data;
272
273         return bytes_to_frames(runtime, dpcm->pcm_buf_pos);
274 }
275
276 static struct snd_pcm_hardware snd_card_dummy_playback =
277 {
278         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
279                                  SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_MMAP_VALID),
280         .formats =              USE_FORMATS,
281         .rates =                USE_RATE,
282         .rate_min =             USE_RATE_MIN,
283         .rate_max =             USE_RATE_MAX,
284         .channels_min =         USE_CHANNELS_MIN,
285         .channels_max =         USE_CHANNELS_MAX,
286         .buffer_bytes_max =     MAX_BUFFER_SIZE,
287         .period_bytes_min =     64,
288         .period_bytes_max =     MAX_BUFFER_SIZE,
289         .periods_min =          USE_PERIODS_MIN,
290         .periods_max =          USE_PERIODS_MAX,
291         .fifo_size =            0,
292 };
293
294 static struct snd_pcm_hardware snd_card_dummy_capture =
295 {
296         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
297                                  SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_MMAP_VALID),
298         .formats =              USE_FORMATS,
299         .rates =                USE_RATE,
300         .rate_min =             USE_RATE_MIN,
301         .rate_max =             USE_RATE_MAX,
302         .channels_min =         USE_CHANNELS_MIN,
303         .channels_max =         USE_CHANNELS_MAX,
304         .buffer_bytes_max =     MAX_BUFFER_SIZE,
305         .period_bytes_min =     64,
306         .period_bytes_max =     MAX_PERIOD_SIZE,
307         .periods_min =          USE_PERIODS_MIN,
308         .periods_max =          USE_PERIODS_MAX,
309         .fifo_size =            0,
310 };
311
312 static void snd_card_dummy_runtime_free(struct snd_pcm_runtime *runtime)
313 {
314         kfree(runtime->private_data);
315 }
316
317 static int snd_card_dummy_hw_params(struct snd_pcm_substream *substream,
318                                     struct snd_pcm_hw_params *hw_params)
319 {
320         return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
321 }
322
323 static int snd_card_dummy_hw_free(struct snd_pcm_substream *substream)
324 {
325         return snd_pcm_lib_free_pages(substream);
326 }
327
328 static struct snd_dummy_pcm *new_pcm_stream(struct snd_pcm_substream *substream)
329 {
330         struct snd_dummy_pcm *dpcm;
331
332         dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
333         if (! dpcm)
334                 return dpcm;
335         init_timer(&dpcm->timer);
336         dpcm->timer.data = (unsigned long) dpcm;
337         dpcm->timer.function = snd_card_dummy_pcm_timer_function;
338         spin_lock_init(&dpcm->lock);
339         dpcm->substream = substream;
340         return dpcm;
341 }
342
343 static int snd_card_dummy_playback_open(struct snd_pcm_substream *substream)
344 {
345         struct snd_pcm_runtime *runtime = substream->runtime;
346         struct snd_dummy_pcm *dpcm;
347         int err;
348
349         if ((dpcm = new_pcm_stream(substream)) == NULL)
350                 return -ENOMEM;
351         runtime->private_data = dpcm;
352         runtime->private_free = snd_card_dummy_runtime_free;
353         runtime->hw = snd_card_dummy_playback;
354         if (substream->pcm->device & 1) {
355                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
356                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
357         }
358         if (substream->pcm->device & 2)
359                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID);
360         if ((err = add_playback_constraints(runtime)) < 0) {
361                 kfree(dpcm);
362                 return err;
363         }
364
365         return 0;
366 }
367
368 static int snd_card_dummy_capture_open(struct snd_pcm_substream *substream)
369 {
370         struct snd_pcm_runtime *runtime = substream->runtime;
371         struct snd_dummy_pcm *dpcm;
372         int err;
373
374         if ((dpcm = new_pcm_stream(substream)) == NULL)
375                 return -ENOMEM;
376         runtime->private_data = dpcm;
377         runtime->private_free = snd_card_dummy_runtime_free;
378         runtime->hw = snd_card_dummy_capture;
379         if (substream->pcm->device == 1) {
380                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
381                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
382         }
383         if (substream->pcm->device & 2)
384                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID);
385         if ((err = add_capture_constraints(runtime)) < 0) {
386                 kfree(dpcm);
387                 return err;
388         }
389
390         return 0;
391 }
392
393 static int snd_card_dummy_playback_close(struct snd_pcm_substream *substream)
394 {
395         return 0;
396 }
397
398 static int snd_card_dummy_capture_close(struct snd_pcm_substream *substream)
399 {
400         return 0;
401 }
402
403 static struct snd_pcm_ops snd_card_dummy_playback_ops = {
404         .open =                 snd_card_dummy_playback_open,
405         .close =                snd_card_dummy_playback_close,
406         .ioctl =                snd_pcm_lib_ioctl,
407         .hw_params =            snd_card_dummy_hw_params,
408         .hw_free =              snd_card_dummy_hw_free,
409         .prepare =              snd_card_dummy_pcm_prepare,
410         .trigger =              snd_card_dummy_pcm_trigger,
411         .pointer =              snd_card_dummy_pcm_pointer,
412 };
413
414 static struct snd_pcm_ops snd_card_dummy_capture_ops = {
415         .open =                 snd_card_dummy_capture_open,
416         .close =                snd_card_dummy_capture_close,
417         .ioctl =                snd_pcm_lib_ioctl,
418         .hw_params =            snd_card_dummy_hw_params,
419         .hw_free =              snd_card_dummy_hw_free,
420         .prepare =              snd_card_dummy_pcm_prepare,
421         .trigger =              snd_card_dummy_pcm_trigger,
422         .pointer =              snd_card_dummy_pcm_pointer,
423 };
424
425 static int __init snd_card_dummy_pcm(struct snd_dummy *dummy, int device, int substreams)
426 {
427         struct snd_pcm *pcm;
428         int err;
429
430         if ((err = snd_pcm_new(dummy->card, "Dummy PCM", device,
431                                substreams, substreams, &pcm)) < 0)
432                 return err;
433         dummy->pcm = pcm;
434         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_card_dummy_playback_ops);
435         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_card_dummy_capture_ops);
436         pcm->private_data = dummy;
437         pcm->info_flags = 0;
438         strcpy(pcm->name, "Dummy PCM");
439         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
440                                               snd_dma_continuous_data(GFP_KERNEL),
441                                               0, 64*1024);
442         return 0;
443 }
444
445 #define DUMMY_VOLUME(xname, xindex, addr) \
446 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
447   .info = snd_dummy_volume_info, \
448   .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
449   .private_value = addr }
450
451 static int snd_dummy_volume_info(struct snd_kcontrol *kcontrol,
452                                  struct snd_ctl_elem_info *uinfo)
453 {
454         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
455         uinfo->count = 2;
456         uinfo->value.integer.min = -50;
457         uinfo->value.integer.max = 100;
458         return 0;
459 }
460  
461 static int snd_dummy_volume_get(struct snd_kcontrol *kcontrol,
462                                 struct snd_ctl_elem_value *ucontrol)
463 {
464         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
465         int addr = kcontrol->private_value;
466
467         spin_lock_irq(&dummy->mixer_lock);
468         ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
469         ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
470         spin_unlock_irq(&dummy->mixer_lock);
471         return 0;
472 }
473
474 static int snd_dummy_volume_put(struct snd_kcontrol *kcontrol,
475                                 struct snd_ctl_elem_value *ucontrol)
476 {
477         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
478         int change, addr = kcontrol->private_value;
479         int left, right;
480
481         left = ucontrol->value.integer.value[0];
482         if (left < -50)
483                 left = -50;
484         if (left > 100)
485                 left = 100;
486         right = ucontrol->value.integer.value[1];
487         if (right < -50)
488                 right = -50;
489         if (right > 100)
490                 right = 100;
491         spin_lock_irq(&dummy->mixer_lock);
492         change = dummy->mixer_volume[addr][0] != left ||
493                  dummy->mixer_volume[addr][1] != right;
494         dummy->mixer_volume[addr][0] = left;
495         dummy->mixer_volume[addr][1] = right;
496         spin_unlock_irq(&dummy->mixer_lock);
497         return change;
498 }
499
500 #define DUMMY_CAPSRC(xname, xindex, addr) \
501 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
502   .info = snd_dummy_capsrc_info, \
503   .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
504   .private_value = addr }
505
506 static int snd_dummy_capsrc_info(struct snd_kcontrol *kcontrol,
507                                  struct snd_ctl_elem_info *uinfo)
508 {
509         uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
510         uinfo->count = 2;
511         uinfo->value.integer.min = 0;
512         uinfo->value.integer.max = 1;
513         return 0;
514 }
515  
516 static int snd_dummy_capsrc_get(struct snd_kcontrol *kcontrol,
517                                 struct snd_ctl_elem_value *ucontrol)
518 {
519         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
520         int addr = kcontrol->private_value;
521
522         spin_lock_irq(&dummy->mixer_lock);
523         ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
524         ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
525         spin_unlock_irq(&dummy->mixer_lock);
526         return 0;
527 }
528
529 static int snd_dummy_capsrc_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
530 {
531         struct snd_dummy *dummy = snd_kcontrol_chip(kcontrol);
532         int change, addr = kcontrol->private_value;
533         int left, right;
534
535         left = ucontrol->value.integer.value[0] & 1;
536         right = ucontrol->value.integer.value[1] & 1;
537         spin_lock_irq(&dummy->mixer_lock);
538         change = dummy->capture_source[addr][0] != left &&
539                  dummy->capture_source[addr][1] != right;
540         dummy->capture_source[addr][0] = left;
541         dummy->capture_source[addr][1] = right;
542         spin_unlock_irq(&dummy->mixer_lock);
543         return change;
544 }
545
546 static struct snd_kcontrol_new snd_dummy_controls[] = {
547 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
548 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
549 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
550 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_MASTER),
551 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
552 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_MASTER),
553 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
554 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MASTER),
555 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
556 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_MASTER)
557 };
558
559 static int __init snd_card_dummy_new_mixer(struct snd_dummy *dummy)
560 {
561         struct snd_card *card = dummy->card;
562         unsigned int idx;
563         int err;
564
565         snd_assert(dummy != NULL, return -EINVAL);
566         spin_lock_init(&dummy->mixer_lock);
567         strcpy(card->mixername, "Dummy Mixer");
568
569         for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
570                 if ((err = snd_ctl_add(card, snd_ctl_new1(&snd_dummy_controls[idx], dummy))) < 0)
571                         return err;
572         }
573         return 0;
574 }
575
576 static int __init snd_dummy_probe(struct platform_device *devptr)
577 {
578         struct snd_card *card;
579         struct snd_dummy *dummy;
580         int idx, err;
581         int dev = devptr->id;
582
583         card = snd_card_new(index[dev], id[dev], THIS_MODULE,
584                             sizeof(struct snd_dummy));
585         if (card == NULL)
586                 return -ENOMEM;
587         dummy = card->private_data;
588         dummy->card = card;
589         for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
590                 if (pcm_substreams[dev] < 1)
591                         pcm_substreams[dev] = 1;
592                 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
593                         pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
594                 if ((err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev])) < 0)
595                         goto __nodev;
596         }
597         if ((err = snd_card_dummy_new_mixer(dummy)) < 0)
598                 goto __nodev;
599         strcpy(card->driver, "Dummy");
600         strcpy(card->shortname, "Dummy");
601         sprintf(card->longname, "Dummy %i", dev + 1);
602
603         snd_card_set_dev(card, &devptr->dev);
604
605         if ((err = snd_card_register(card)) == 0) {
606                 platform_set_drvdata(devptr, card);
607                 return 0;
608         }
609       __nodev:
610         snd_card_free(card);
611         return err;
612 }
613
614 static int snd_dummy_remove(struct platform_device *devptr)
615 {
616         snd_card_free(platform_get_drvdata(devptr));
617         platform_set_drvdata(devptr, NULL);
618         return 0;
619 }
620
621 #ifdef CONFIG_PM
622 static int snd_dummy_suspend(struct platform_device *pdev, pm_message_t state)
623 {
624         struct snd_card *card = platform_get_drvdata(pdev);
625         struct snd_dummy *dummy = card->private_data;
626
627         snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
628         snd_pcm_suspend_all(dummy->pcm);
629         return 0;
630 }
631         
632 static int snd_dummy_resume(struct platform_device *pdev)
633 {
634         struct snd_card *card = platform_get_drvdata(pdev);
635
636         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
637         return 0;
638 }
639 #endif
640
641 #define SND_DUMMY_DRIVER        "snd_dummy"
642
643 static struct platform_driver snd_dummy_driver = {
644         .probe          = snd_dummy_probe,
645         .remove         = snd_dummy_remove,
646 #ifdef CONFIG_PM
647         .suspend        = snd_dummy_suspend,
648         .resume         = snd_dummy_resume,
649 #endif
650         .driver         = {
651                 .name   = SND_DUMMY_DRIVER
652         },
653 };
654
655 static void __init_or_module snd_dummy_unregister_all(void)
656 {
657         int i;
658
659         for (i = 0; i < ARRAY_SIZE(devices); ++i)
660                 platform_device_unregister(devices[i]);
661         platform_driver_unregister(&snd_dummy_driver);
662 }
663
664 static int __init alsa_card_dummy_init(void)
665 {
666         int i, cards, err;
667
668         if ((err = platform_driver_register(&snd_dummy_driver)) < 0)
669                 return err;
670
671         cards = 0;
672         for (i = 0; i < SNDRV_CARDS; i++) {
673                 struct platform_device *device;
674                 if (! enable[i])
675                         continue;
676                 device = platform_device_register_simple(SND_DUMMY_DRIVER,
677                                                          i, NULL, 0);
678                 if (IS_ERR(device)) {
679                         err = PTR_ERR(device);
680                         goto errout;
681                 }
682                 devices[i] = device;
683                 cards++;
684         }
685         if (!cards) {
686 #ifdef MODULE
687                 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
688 #endif
689                 err = -ENODEV;
690                 goto errout;
691         }
692         return 0;
693
694  errout:
695         snd_dummy_unregister_all();
696         return err;
697 }
698
699 static void __exit alsa_card_dummy_exit(void)
700 {
701         snd_dummy_unregister_all();
702 }
703
704 module_init(alsa_card_dummy_init)
705 module_exit(alsa_card_dummy_exit)