[ALSA] snd-dummy - Code clean-up
[linux-3.10.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/jiffies.h>
24 #include <linux/slab.h>
25 #include <linux/time.h>
26 #include <linux/wait.h>
27 #include <linux/moduleparam.h>
28 #include <sound/core.h>
29 #include <sound/control.h>
30 #include <sound/pcm.h>
31 #include <sound/rawmidi.h>
32 #include <sound/initval.h>
33
34 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
35 MODULE_DESCRIPTION("Dummy soundcard (/dev/null)");
36 MODULE_LICENSE("GPL");
37 MODULE_SUPPORTED_DEVICE("{{ALSA,Dummy soundcard}}");
38
39 #define MAX_PCM_DEVICES         4
40 #define MAX_PCM_SUBSTREAMS      16
41 #define MAX_MIDI_DEVICES        2
42
43 #if 0 /* emu10k1 emulation */
44 #define MAX_BUFFER_SIZE         (128 * 1024)
45 static int emu10k1_playback_constraints(snd_pcm_runtime_t *runtime)
46 {
47         int err;
48         if ((err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
49                 return err;
50         if ((err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256, UINT_MAX)) < 0)
51                 return err;
52         return 0;
53 }
54 #define add_playback_constraints emu10k1_playback_constraints
55 #endif
56
57 #if 0 /* RME9652 emulation */
58 #define MAX_BUFFER_SIZE         (26 * 64 * 1024)
59 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S32_LE
60 #define USE_CHANNELS_MIN        26
61 #define USE_CHANNELS_MAX        26
62 #define USE_PERIODS_MIN         2
63 #define USE_PERIODS_MAX         2
64 #endif
65
66 #if 0 /* ICE1712 emulation */
67 #define MAX_BUFFER_SIZE         (256 * 1024)
68 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S32_LE
69 #define USE_CHANNELS_MIN        10
70 #define USE_CHANNELS_MAX        10
71 #define USE_PERIODS_MIN         1
72 #define USE_PERIODS_MAX         1024
73 #endif
74
75 #if 0 /* UDA1341 emulation */
76 #define MAX_BUFFER_SIZE         (16380)
77 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S16_LE
78 #define USE_CHANNELS_MIN        2
79 #define USE_CHANNELS_MAX        2
80 #define USE_PERIODS_MIN         2
81 #define USE_PERIODS_MAX         255
82 #endif
83
84 #if 0 /* simple AC97 bridge (intel8x0) with 48kHz AC97 only codec */
85 #define USE_FORMATS             SNDRV_PCM_FMTBIT_S16_LE
86 #define USE_CHANNELS_MIN        2
87 #define USE_CHANNELS_MAX        2
88 #define USE_RATE                SNDRV_PCM_RATE_48000
89 #define USE_RATE_MIN            48000
90 #define USE_RATE_MAX            48000
91 #endif
92
93
94 /* defaults */
95 #ifndef MAX_BUFFER_SIZE
96 #define MAX_BUFFER_SIZE         (64*1024)
97 #endif
98 #ifndef USE_FORMATS
99 #define USE_FORMATS             (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE)
100 #endif
101 #ifndef USE_RATE
102 #define USE_RATE                SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000
103 #define USE_RATE_MIN            5500
104 #define USE_RATE_MAX            48000
105 #endif
106 #ifndef USE_CHANNELS_MIN
107 #define USE_CHANNELS_MIN        1
108 #endif
109 #ifndef USE_CHANNELS_MAX
110 #define USE_CHANNELS_MAX        2
111 #endif
112 #ifndef USE_PERIODS_MIN
113 #define USE_PERIODS_MIN         1
114 #endif
115 #ifndef USE_PERIODS_MAX
116 #define USE_PERIODS_MAX         1024
117 #endif
118 #ifndef add_playback_constraints
119 #define add_playback_constraints(x) 0
120 #endif
121 #ifndef add_capture_constraints
122 #define add_capture_constraints(x) 0
123 #endif
124
125 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
126 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
127 static int enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
128 static int pcm_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
129 static int pcm_substreams[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 8};
130 //static int midi_devs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 2};
131
132 module_param_array(index, int, NULL, 0444);
133 MODULE_PARM_DESC(index, "Index value for dummy soundcard.");
134 module_param_array(id, charp, NULL, 0444);
135 MODULE_PARM_DESC(id, "ID string for dummy soundcard.");
136 module_param_array(enable, bool, NULL, 0444);
137 MODULE_PARM_DESC(enable, "Enable this dummy soundcard.");
138 module_param_array(pcm_devs, int, NULL, 0444);
139 MODULE_PARM_DESC(pcm_devs, "PCM devices # (0-4) for dummy driver.");
140 module_param_array(pcm_substreams, int, NULL, 0444);
141 MODULE_PARM_DESC(pcm_substreams, "PCM substreams # (1-16) for dummy driver.");
142 //module_param_array(midi_devs, int, NULL, 0444);
143 //MODULE_PARM_DESC(midi_devs, "MIDI devices # (0-2) for dummy driver.");
144
145 #define MIXER_ADDR_MASTER       0
146 #define MIXER_ADDR_LINE         1
147 #define MIXER_ADDR_MIC          2
148 #define MIXER_ADDR_SYNTH        3
149 #define MIXER_ADDR_CD           4
150 #define MIXER_ADDR_LAST         4
151
152 typedef struct snd_card_dummy {
153         snd_card_t *card;
154         spinlock_t mixer_lock;
155         int mixer_volume[MIXER_ADDR_LAST+1][2];
156         int capture_source[MIXER_ADDR_LAST+1][2];
157 } snd_card_dummy_t;
158
159 typedef struct snd_card_dummy_pcm {
160         snd_card_dummy_t *dummy;
161         spinlock_t lock;
162         struct timer_list timer;
163         unsigned int pcm_size;
164         unsigned int pcm_count;
165         unsigned int pcm_bps;           /* bytes per second */
166         unsigned int pcm_jiffie;        /* bytes per one jiffie */
167         unsigned int pcm_irq_pos;       /* IRQ position */
168         unsigned int pcm_buf_pos;       /* position in buffer */
169         snd_pcm_substream_t *substream;
170 } snd_card_dummy_pcm_t;
171
172 static snd_card_t *snd_dummy_cards[SNDRV_CARDS] = SNDRV_DEFAULT_PTR;
173
174
175 static inline void snd_card_dummy_pcm_timer_start(snd_card_dummy_pcm_t *dpcm)
176 {
177         dpcm->timer.expires = 1 + jiffies;
178         add_timer(&dpcm->timer);
179 }
180
181 static inline void snd_card_dummy_pcm_timer_stop(snd_card_dummy_pcm_t *dpcm)
182 {
183         del_timer(&dpcm->timer);
184 }
185
186 static int snd_card_dummy_pcm_trigger(snd_pcm_substream_t *substream, int cmd)
187 {
188         snd_pcm_runtime_t *runtime = substream->runtime;
189         snd_dummy_card_pcm_t *dpcm = runtime->private_data;
190         int err = 0;
191
192         spin_lock(&dpcm->lock);
193         if (cmd == SNDRV_PCM_TRIGGER_START) {
194                 snd_card_dummy_pcm_timer_start(dpcm);
195         } else if (cmd == SNDRV_PCM_TRIGGER_STOP) {
196                 snd_card_dummy_pcm_timer_stop(dpcm);
197         } else {
198                 err = -EINVAL;
199         }
200         spin_unlock(&dpcm->lock);
201         return err;
202 }
203
204 static int snd_card_dummy_pcm_prepare(snd_pcm_substream_t * substream)
205 {
206         snd_pcm_runtime_t *runtime = substream->runtime;
207         snd_card_dummy_pcm_t *dpcm = runtime->private_data;
208         unsigned int bps;
209
210         bps = runtime->rate * runtime->channels;
211         bps *= snd_pcm_format_width(runtime->format);
212         bps /= 8;
213         if (bps <= 0)
214                 return -EINVAL;
215         dpcm->pcm_bps = bps;
216         dpcm->pcm_jiffie = bps / HZ;
217         dpcm->pcm_size = snd_pcm_lib_buffer_bytes(substream);
218         dpcm->pcm_count = snd_pcm_lib_period_bytes(substream);
219         dpcm->pcm_irq_pos = 0;
220         dpcm->pcm_buf_pos = 0;
221         return 0;
222 }
223
224 static void snd_card_dummy_pcm_timer_function(unsigned long data)
225 {
226         snd_card_dummy_pcm_t *dpcm = (snd_card_dummy_pcm_t *)data;
227         
228         spin_lock(&dpcm->lock);
229         dpcm->timer.expires = 1 + jiffies;
230         add_timer(&dpcm->timer);
231         dpcm->pcm_irq_pos += dpcm->pcm_jiffie;
232         dpcm->pcm_buf_pos += dpcm->pcm_jiffie;
233         dpcm->pcm_buf_pos %= dpcm->pcm_size;
234         if (dpcm->pcm_irq_pos >= dpcm->pcm_count) {
235                 dpcm->pcm_irq_pos %= dpcm->pcm_count;
236                 spin_unlock(&dpcm->lock);
237                 snd_pcm_period_elapsed(dpcm->substream);
238                 spin_lock(&dpcm->lock);
239         }
240         spin_unlock(&dpcm->lock);
241 }
242
243 static snd_pcm_uframes_t snd_card_dummy_pcm_pointer(snd_pcm_substream_t * substream)
244 {
245         snd_pcm_runtime_t *runtime = substream->runtime;
246         snd_card_dummy_pcm_t *dpcm = runtime->private_data;
247
248         return bytes_to_frames(runtime, dpcm->pcm_buf_pos);
249 }
250
251 static snd_pcm_hardware_t snd_card_dummy_playback =
252 {
253         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
254                                  SNDRV_PCM_INFO_MMAP_VALID),
255         .formats =              USE_FORMATS,
256         .rates =                USE_RATE,
257         .rate_min =             USE_RATE_MIN,
258         .rate_max =             USE_RATE_MAX,
259         .channels_min =         USE_CHANNELS_MIN,
260         .channels_max =         USE_CHANNELS_MAX,
261         .buffer_bytes_max =     MAX_BUFFER_SIZE,
262         .period_bytes_min =     64,
263         .period_bytes_max =     MAX_BUFFER_SIZE,
264         .periods_min =          USE_PERIODS_MIN,
265         .periods_max =          USE_PERIODS_MAX,
266         .fifo_size =            0,
267 };
268
269 static snd_pcm_hardware_t snd_card_dummy_capture =
270 {
271         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
272                                  SNDRV_PCM_INFO_MMAP_VALID),
273         .formats =              USE_FORMATS,
274         .rates =                USE_RATE,
275         .rate_min =             USE_RATE_MIN,
276         .rate_max =             USE_RATE_MAX,
277         .channels_min =         USE_CHANNELS_MIN,
278         .channels_max =         USE_CHANNELS_MAX,
279         .buffer_bytes_max =     MAX_BUFFER_SIZE,
280         .period_bytes_min =     64,
281         .period_bytes_max =     MAX_BUFFER_SIZE,
282         .periods_min =          USE_PERIODS_MIN,
283         .periods_max =          USE_PERIODS_MAX,
284         .fifo_size =            0,
285 };
286
287 static void snd_card_dummy_runtime_free(snd_pcm_runtime_t *runtime)
288 {
289         kfree(runtime->private_data);
290 }
291
292 static int snd_card_dummy_hw_params(snd_pcm_substream_t * substream,
293                                     snd_pcm_hw_params_t * hw_params)
294 {
295         return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
296 }
297
298 static int snd_card_dummy_hw_free(snd_pcm_substream_t * substream)
299 {
300         return snd_pcm_lib_free_pages(substream);
301 }
302
303 static snd_card_dummy_pcm_t *new_pcm_stream(snd_pcm_substream_t *substream)
304 {
305         snd_card_dummy_pcm_t *dpcm;
306
307         dpcm = kzalloc(sizeof(*dpcm), GFP_KERNEL);
308         if (! dpcm)
309                 return dpcm;
310         init_timer(&dpcm->timer);
311         dpcm->timer.data = (unsigned long) dpcm;
312         dpcm->timer.function = snd_card_dummy_pcm_timer_function;
313         spin_lock_init(&dpcm->lock);
314         dpcm->substream = substream;
315         return dpcm;
316 }
317
318 static int snd_card_dummy_playback_open(snd_pcm_substream_t * substream)
319 {
320         snd_pcm_runtime_t *runtime = substream->runtime;
321         snd_card_dummy_pcm_t *dpcm;
322         int err;
323
324         if ((dpcm = new_pcm_stream(substream)) == NULL)
325                 return -ENOMEM;
326         runtime->private_data = dpcm;
327         runtime->private_free = snd_card_dummy_runtime_free;
328         runtime->hw = snd_card_dummy_playback;
329         if (substream->pcm->device & 1) {
330                 runtime->hw.info &= ~SNDRV_PCM_INFO_INTERLEAVED;
331                 runtime->hw.info |= SNDRV_PCM_INFO_NONINTERLEAVED;
332         }
333         if (substream->pcm->device & 2)
334                 runtime->hw.info &= ~(SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID);
335         if ((err = add_playback_constraints(runtime)) < 0) {
336                 kfree(dpcm);
337                 return err;
338         }
339
340         return 0;
341 }
342
343 static int snd_card_dummy_capture_open(snd_pcm_substream_t * substream)
344 {
345         snd_pcm_runtime_t *runtime = substream->runtime;
346         snd_card_dummy_pcm_t *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_capture;
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_capture_constraints(runtime)) < 0) {
361                 kfree(dpcm);
362                 return err;
363         }
364
365         return 0;
366 }
367
368 static int snd_card_dummy_playback_close(snd_pcm_substream_t * substream)
369 {
370         return 0;
371 }
372
373 static int snd_card_dummy_capture_close(snd_pcm_substream_t * substream)
374 {
375         return 0;
376 }
377
378 static snd_pcm_ops_t snd_card_dummy_playback_ops = {
379         .open =                 snd_card_dummy_playback_open,
380         .close =                snd_card_dummy_playback_close,
381         .ioctl =                snd_pcm_lib_ioctl,
382         .hw_params =            snd_card_dummy_hw_params,
383         .hw_free =              snd_card_dummy_hw_free,
384         .prepare =              snd_card_dummy_pcm_prepare,
385         .trigger =              snd_card_dummy_pcm_trigger,
386         .pointer =              snd_card_dummy_pcm_pointer,
387 };
388
389 static snd_pcm_ops_t snd_card_dummy_capture_ops = {
390         .open =                 snd_card_dummy_capture_open,
391         .close =                snd_card_dummy_capture_close,
392         .ioctl =                snd_pcm_lib_ioctl,
393         .hw_params =            snd_card_dummy_hw_params,
394         .hw_free =              snd_card_dummy_hw_free,
395         .prepare =              snd_card_dummy_pcm_prepare,
396         .trigger =              snd_card_dummy_pcm_trigger,
397         .pointer =              snd_card_dummy_pcm_pointer,
398 };
399
400 static int __init snd_card_dummy_pcm(snd_card_dummy_t *dummy, int device, int substreams)
401 {
402         snd_pcm_t *pcm;
403         int err;
404
405         if ((err = snd_pcm_new(dummy->card, "Dummy PCM", device, substreams, substreams, &pcm)) < 0)
406                 return err;
407         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_card_dummy_playback_ops);
408         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_card_dummy_capture_ops);
409         pcm->private_data = dummy;
410         pcm->info_flags = 0;
411         strcpy(pcm->name, "Dummy PCM");
412         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
413                                               snd_dma_continuous_data(GFP_KERNEL),
414                                               0, 64*1024);
415         return 0;
416 }
417
418 #define DUMMY_VOLUME(xname, xindex, addr) \
419 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
420   .info = snd_dummy_volume_info, \
421   .get = snd_dummy_volume_get, .put = snd_dummy_volume_put, \
422   .private_value = addr }
423
424 static int snd_dummy_volume_info(snd_kcontrol_t * kcontrol, snd_ctl_elem_info_t * uinfo)
425 {
426         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
427         uinfo->count = 2;
428         uinfo->value.integer.min = -50;
429         uinfo->value.integer.max = 100;
430         return 0;
431 }
432  
433 static int snd_dummy_volume_get(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
434 {
435         snd_card_dummy_t *dummy = snd_kcontrol_chip(kcontrol);
436         int addr = kcontrol->private_value;
437
438         spin_lock_irq(&dummy->mixer_lock);
439         ucontrol->value.integer.value[0] = dummy->mixer_volume[addr][0];
440         ucontrol->value.integer.value[1] = dummy->mixer_volume[addr][1];
441         spin_unlock_irq(&dummy->mixer_lock);
442         return 0;
443 }
444
445 static int snd_dummy_volume_put(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
446 {
447         snd_card_dummy_t *dummy = snd_kcontrol_chip(kcontrol);
448         int change, addr = kcontrol->private_value;
449         int left, right;
450
451         left = ucontrol->value.integer.value[0];
452         if (left < -50)
453                 left = -50;
454         if (left > 100)
455                 left = 100;
456         right = ucontrol->value.integer.value[1];
457         if (right < -50)
458                 right = -50;
459         if (right > 100)
460                 right = 100;
461         spin_lock_irq(&dummy->mixer_lock);
462         change = dummy->mixer_volume[addr][0] != left ||
463                  dummy->mixer_volume[addr][1] != right;
464         dummy->mixer_volume[addr][0] = left;
465         dummy->mixer_volume[addr][1] = right;
466         spin_unlock_irq(&dummy->mixer_lock);
467         return change;
468 }
469
470 #define DUMMY_CAPSRC(xname, xindex, addr) \
471 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
472   .info = snd_dummy_capsrc_info, \
473   .get = snd_dummy_capsrc_get, .put = snd_dummy_capsrc_put, \
474   .private_value = addr }
475
476 static int snd_dummy_capsrc_info(snd_kcontrol_t * kcontrol, snd_ctl_elem_info_t * uinfo)
477 {
478         uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
479         uinfo->count = 2;
480         uinfo->value.integer.min = 0;
481         uinfo->value.integer.max = 1;
482         return 0;
483 }
484  
485 static int snd_dummy_capsrc_get(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
486 {
487         snd_card_dummy_t *dummy = snd_kcontrol_chip(kcontrol);
488         int addr = kcontrol->private_value;
489
490         spin_lock_irq(&dummy->mixer_lock);
491         ucontrol->value.integer.value[0] = dummy->capture_source[addr][0];
492         ucontrol->value.integer.value[1] = dummy->capture_source[addr][1];
493         spin_unlock_irq(&dummy->mixer_lock);
494         return 0;
495 }
496
497 static int snd_dummy_capsrc_put(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
498 {
499         snd_card_dummy_t *dummy = snd_kcontrol_chip(kcontrol);
500         int change, addr = kcontrol->private_value;
501         int left, right;
502
503         left = ucontrol->value.integer.value[0] & 1;
504         right = ucontrol->value.integer.value[1] & 1;
505         spin_lock_irq(&dummy->mixer_lock);
506         change = dummy->capture_source[addr][0] != left &&
507                  dummy->capture_source[addr][1] != right;
508         dummy->capture_source[addr][0] = left;
509         dummy->capture_source[addr][1] = right;
510         spin_unlock_irq(&dummy->mixer_lock);
511         return change;
512 }
513
514 static snd_kcontrol_new_t snd_dummy_controls[] = {
515 DUMMY_VOLUME("Master Volume", 0, MIXER_ADDR_MASTER),
516 DUMMY_CAPSRC("Master Capture Switch", 0, MIXER_ADDR_MASTER),
517 DUMMY_VOLUME("Synth Volume", 0, MIXER_ADDR_SYNTH),
518 DUMMY_CAPSRC("Synth Capture Switch", 0, MIXER_ADDR_MASTER),
519 DUMMY_VOLUME("Line Volume", 0, MIXER_ADDR_LINE),
520 DUMMY_CAPSRC("Line Capture Switch", 0, MIXER_ADDR_MASTER),
521 DUMMY_VOLUME("Mic Volume", 0, MIXER_ADDR_MIC),
522 DUMMY_CAPSRC("Mic Capture Switch", 0, MIXER_ADDR_MASTER),
523 DUMMY_VOLUME("CD Volume", 0, MIXER_ADDR_CD),
524 DUMMY_CAPSRC("CD Capture Switch", 0, MIXER_ADDR_MASTER)
525 };
526
527 static int __init snd_card_dummy_new_mixer(snd_card_dummy_t * dummy)
528 {
529         snd_card_t *card = dummy->card;
530         unsigned int idx;
531         int err;
532
533         snd_assert(dummy != NULL, return -EINVAL);
534         spin_lock_init(&dummy->mixer_lock);
535         strcpy(card->mixername, "Dummy Mixer");
536
537         for (idx = 0; idx < ARRAY_SIZE(snd_dummy_controls); idx++) {
538                 if ((err = snd_ctl_add(card, snd_ctl_new1(&snd_dummy_controls[idx], dummy))) < 0)
539                         return err;
540         }
541         return 0;
542 }
543
544 static int __init snd_card_dummy_probe(int dev)
545 {
546         snd_card_t *card;
547         struct snd_card_dummy *dummy;
548         int idx, err;
549
550         if (!enable[dev])
551                 return -ENODEV;
552         card = snd_card_new(index[dev], id[dev], THIS_MODULE,
553                             sizeof(struct snd_card_dummy));
554         if (card == NULL)
555                 return -ENOMEM;
556         dummy = (struct snd_card_dummy *)card->private_data;
557         dummy->card = card;
558         for (idx = 0; idx < MAX_PCM_DEVICES && idx < pcm_devs[dev]; idx++) {
559                 if (pcm_substreams[dev] < 1)
560                         pcm_substreams[dev] = 1;
561                 if (pcm_substreams[dev] > MAX_PCM_SUBSTREAMS)
562                         pcm_substreams[dev] = MAX_PCM_SUBSTREAMS;
563                 if ((err = snd_card_dummy_pcm(dummy, idx, pcm_substreams[dev])) < 0)
564                         goto __nodev;
565         }
566         if ((err = snd_card_dummy_new_mixer(dummy)) < 0)
567                 goto __nodev;
568         strcpy(card->driver, "Dummy");
569         strcpy(card->shortname, "Dummy");
570         sprintf(card->longname, "Dummy %i", dev + 1);
571
572         if ((err = snd_card_set_generic_dev(card)) < 0)
573                 goto __nodev;
574
575         if ((err = snd_card_register(card)) == 0) {
576                 snd_dummy_cards[dev] = card;
577                 return 0;
578         }
579       __nodev:
580         snd_card_free(card);
581         return err;
582 }
583
584 static int __init alsa_card_dummy_init(void)
585 {
586         int dev, cards;
587
588         for (dev = cards = 0; dev < SNDRV_CARDS && enable[dev]; dev++) {
589                 if (snd_card_dummy_probe(dev) < 0) {
590 #ifdef MODULE
591                         printk(KERN_ERR "Dummy soundcard #%i not found or device busy\n", dev + 1);
592 #endif
593                         break;
594                 }
595                 cards++;
596         }
597         if (!cards) {
598 #ifdef MODULE
599                 printk(KERN_ERR "Dummy soundcard not found or device busy\n");
600 #endif
601                 return -ENODEV;
602         }
603         return 0;
604 }
605
606 static void __exit alsa_card_dummy_exit(void)
607 {
608         int idx;
609
610         for (idx = 0; idx < SNDRV_CARDS; idx++)
611                 snd_card_free(snd_dummy_cards[idx]);
612 }
613
614 module_init(alsa_card_dummy_init)
615 module_exit(alsa_card_dummy_exit)