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[PATCH] x86_64: use halt() instead of raw inline assembly
[wrt350n-kernel.git] / sound / core / pcm.c
blob7581edd7b9ffbf354d8542b010aa16d671cfca63
1 /*
2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@suse.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22 #include <sound/driver.h>
23 #include <linux/init.h>
24 #include <linux/slab.h>
25 #include <linux/time.h>
26 #include <linux/mutex.h>
27 #include <sound/core.h>
28 #include <sound/minors.h>
29 #include <sound/pcm.h>
30 #include <sound/control.h>
31 #include <sound/info.h>
32
33 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Abramo Bagnara <abramo@alsa-project.org>");
34 MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
35 MODULE_LICENSE("GPL");
36
37 static LIST_HEAD(snd_pcm_devices);
38 static LIST_HEAD(snd_pcm_notify_list);
39 static DEFINE_MUTEX(register_mutex);
40
41 static int snd_pcm_free(struct snd_pcm *pcm);
42 static int snd_pcm_dev_free(struct snd_device *device);
43 static int snd_pcm_dev_register(struct snd_device *device);
44 static int snd_pcm_dev_disconnect(struct snd_device *device);
45 static int snd_pcm_dev_unregister(struct snd_device *device);
46
47 static struct snd_pcm *snd_pcm_search(struct snd_card *card, int device)
48 {
49 struct list_head *p;
50 struct snd_pcm *pcm;
51
52 list_for_each(p, &snd_pcm_devices) {
53 pcm = list_entry(p, struct snd_pcm, list);
54 if (pcm->card == card && pcm->device == device)
55 return pcm;
56 }
57 return NULL;
58 }
59
60 static int snd_pcm_control_ioctl(struct snd_card *card,
61 struct snd_ctl_file *control,
62 unsigned int cmd, unsigned long arg)
63 {
64 switch (cmd) {
65 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
66 {
67 int device;
68
69 if (get_user(device, (int __user *)arg))
70 return -EFAULT;
71 mutex_lock(&register_mutex);
72 device = device < 0 ? 0 : device + 1;
73 while (device < SNDRV_PCM_DEVICES) {
74 if (snd_pcm_search(card, device))
75 break;
76 device++;
77 }
78 if (device == SNDRV_PCM_DEVICES)
79 device = -1;
80 mutex_unlock(&register_mutex);
81 if (put_user(device, (int __user *)arg))
82 return -EFAULT;
83 return 0;
84 }
85 case SNDRV_CTL_IOCTL_PCM_INFO:
86 {
87 struct snd_pcm_info __user *info;
88 unsigned int device, subdevice;
89 int stream;
90 struct snd_pcm *pcm;
91 struct snd_pcm_str *pstr;
92 struct snd_pcm_substream *substream;
93 int err;
94
95 info = (struct snd_pcm_info __user *)arg;
96 if (get_user(device, &info->device))
97 return -EFAULT;
98 if (get_user(stream, &info->stream))
99 return -EFAULT;
100 if (stream < 0 || stream > 1)
101 return -EINVAL;
102 if (get_user(subdevice, &info->subdevice))
103 return -EFAULT;
104 mutex_lock(&register_mutex);
105 pcm = snd_pcm_search(card, device);
106 if (pcm == NULL) {
107 err = -ENXIO;
108 goto _error;
109 }
110 pstr = &pcm->streams[stream];
111 if (pstr->substream_count == 0) {
112 err = -ENOENT;
113 goto _error;
114 }
115 if (subdevice >= pstr->substream_count) {
116 err = -ENXIO;
117 goto _error;
118 }
119 for (substream = pstr->substream; substream;
120 substream = substream->next)
121 if (substream->number == (int)subdevice)
122 break;
123 if (substream == NULL) {
124 err = -ENXIO;
125 goto _error;
126 }
127 err = snd_pcm_info_user(substream, info);
128 _error:
129 mutex_unlock(&register_mutex);
130 return err;
131 }
132 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
133 {
134 int val;
135
136 if (get_user(val, (int __user *)arg))
137 return -EFAULT;
138 control->prefer_pcm_subdevice = val;
139 return 0;
140 }
141 }
142 return -ENOIOCTLCMD;
143 }
144
145 #ifdef CONFIG_SND_VERBOSE_PROCFS
146
147 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
148 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
149 #define READY(v) [SNDRV_PCM_READY_##v] = #v
150 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
151 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
152 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
153 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
154 #define START(v) [SNDRV_PCM_START_##v] = #v
155 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
156 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
157
158 static char *snd_pcm_format_names[] = {
159 FORMAT(S8),
160 FORMAT(U8),
161 FORMAT(S16_LE),
162 FORMAT(S16_BE),
163 FORMAT(U16_LE),
164 FORMAT(U16_BE),
165 FORMAT(S24_LE),
166 FORMAT(S24_BE),
167 FORMAT(U24_LE),
168 FORMAT(U24_BE),
169 FORMAT(S32_LE),
170 FORMAT(S32_BE),
171 FORMAT(U32_LE),
172 FORMAT(U32_BE),
173 FORMAT(FLOAT_LE),
174 FORMAT(FLOAT_BE),
175 FORMAT(FLOAT64_LE),
176 FORMAT(FLOAT64_BE),
177 FORMAT(IEC958_SUBFRAME_LE),
178 FORMAT(IEC958_SUBFRAME_BE),
179 FORMAT(MU_LAW),
180 FORMAT(A_LAW),
181 FORMAT(IMA_ADPCM),
182 FORMAT(MPEG),
183 FORMAT(GSM),
184 FORMAT(SPECIAL),
185 FORMAT(S24_3LE),
186 FORMAT(S24_3BE),
187 FORMAT(U24_3LE),
188 FORMAT(U24_3BE),
189 FORMAT(S20_3LE),
190 FORMAT(S20_3BE),
191 FORMAT(U20_3LE),
192 FORMAT(U20_3BE),
193 FORMAT(S18_3LE),
194 FORMAT(S18_3BE),
195 FORMAT(U18_3LE),
196 FORMAT(U18_3BE),
197 };
198
199 static const char *snd_pcm_format_name(snd_pcm_format_t format)
200 {
201 return snd_pcm_format_names[format];
202 }
203
204 static char *snd_pcm_stream_names[] = {
205 STREAM(PLAYBACK),
206 STREAM(CAPTURE),
207 };
208
209 static char *snd_pcm_state_names[] = {
210 STATE(OPEN),
211 STATE(SETUP),
212 STATE(PREPARED),
213 STATE(RUNNING),
214 STATE(XRUN),
215 STATE(DRAINING),
216 STATE(PAUSED),
217 STATE(SUSPENDED),
218 };
219
220 static char *snd_pcm_access_names[] = {
221 ACCESS(MMAP_INTERLEAVED),
222 ACCESS(MMAP_NONINTERLEAVED),
223 ACCESS(MMAP_COMPLEX),
224 ACCESS(RW_INTERLEAVED),
225 ACCESS(RW_NONINTERLEAVED),
226 };
227
228 static char *snd_pcm_subformat_names[] = {
229 SUBFORMAT(STD),
230 };
231
232 static char *snd_pcm_tstamp_mode_names[] = {
233 TSTAMP(NONE),
234 TSTAMP(MMAP),
235 };
236
237 static const char *snd_pcm_stream_name(int stream)
238 {
239 snd_assert(stream <= SNDRV_PCM_STREAM_LAST, return NULL);
240 return snd_pcm_stream_names[stream];
241 }
242
243 static const char *snd_pcm_access_name(snd_pcm_access_t access)
244 {
245 return snd_pcm_access_names[access];
246 }
247
248 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
249 {
250 return snd_pcm_subformat_names[subformat];
251 }
252
253 static const char *snd_pcm_tstamp_mode_name(int mode)
254 {
255 snd_assert(mode <= SNDRV_PCM_TSTAMP_LAST, return NULL);
256 return snd_pcm_tstamp_mode_names[mode];
257 }
258
259 static const char *snd_pcm_state_name(snd_pcm_state_t state)
260 {
261 return snd_pcm_state_names[state];
262 }
263
264 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
265 #include <linux/soundcard.h>
266
267 static const char *snd_pcm_oss_format_name(int format)
268 {
269 switch (format) {
270 case AFMT_MU_LAW:
271 return "MU_LAW";
272 case AFMT_A_LAW:
273 return "A_LAW";
274 case AFMT_IMA_ADPCM:
275 return "IMA_ADPCM";
276 case AFMT_U8:
277 return "U8";
278 case AFMT_S16_LE:
279 return "S16_LE";
280 case AFMT_S16_BE:
281 return "S16_BE";
282 case AFMT_S8:
283 return "S8";
284 case AFMT_U16_LE:
285 return "U16_LE";
286 case AFMT_U16_BE:
287 return "U16_BE";
288 case AFMT_MPEG:
289 return "MPEG";
290 default:
291 return "unknown";
292 }
293 }
294 #endif
295
296 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
297 struct snd_info_buffer *buffer)
298 {
299 struct snd_pcm_info *info;
300 int err;
301
302 if (! substream)
303 return;
304
305 info = kmalloc(sizeof(*info), GFP_KERNEL);
306 if (! info) {
307 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
308 return;
309 }
310
311 err = snd_pcm_info(substream, info);
312 if (err < 0) {
313 snd_iprintf(buffer, "error %d\n", err);
314 kfree(info);
315 return;
316 }
317 snd_iprintf(buffer, "card: %d\n", info->card);
318 snd_iprintf(buffer, "device: %d\n", info->device);
319 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
320 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
321 snd_iprintf(buffer, "id: %s\n", info->id);
322 snd_iprintf(buffer, "name: %s\n", info->name);
323 snd_iprintf(buffer, "subname: %s\n", info->subname);
324 snd_iprintf(buffer, "class: %d\n", info->dev_class);
325 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
326 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
327 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
328 kfree(info);
329 }
330
331 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
332 struct snd_info_buffer *buffer)
333 {
334 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
335 buffer);
336 }
337
338 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
339 struct snd_info_buffer *buffer)
340 {
341 snd_pcm_proc_info_read((struct snd_pcm_substream *)entry->private_data,
342 buffer);
343 }
344
345 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
346 struct snd_info_buffer *buffer)
347 {
348 struct snd_pcm_substream *substream = entry->private_data;
349 struct snd_pcm_runtime *runtime = substream->runtime;
350 if (!runtime) {
351 snd_iprintf(buffer, "closed\n");
352 return;
353 }
354 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
355 snd_iprintf(buffer, "no setup\n");
356 return;
357 }
358 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
359 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
360 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
361 snd_iprintf(buffer, "channels: %u\n", runtime->channels);
362 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
363 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
364 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
365 snd_iprintf(buffer, "tick_time: %u\n", runtime->tick_time);
366 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
367 if (substream->oss.oss) {
368 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
369 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
370 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
371 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
372 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
373 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
374 }
375 #endif
376 }
377
378 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
379 struct snd_info_buffer *buffer)
380 {
381 struct snd_pcm_substream *substream = entry->private_data;
382 struct snd_pcm_runtime *runtime = substream->runtime;
383 if (!runtime) {
384 snd_iprintf(buffer, "closed\n");
385 return;
386 }
387 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
388 snd_iprintf(buffer, "no setup\n");
389 return;
390 }
391 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
392 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
393 snd_iprintf(buffer, "sleep_min: %u\n", runtime->sleep_min);
394 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
395 snd_iprintf(buffer, "xfer_align: %lu\n", runtime->xfer_align);
396 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
397 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
398 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
399 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
400 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
401 }
402
403 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
404 struct snd_info_buffer *buffer)
405 {
406 struct snd_pcm_substream *substream = entry->private_data;
407 struct snd_pcm_runtime *runtime = substream->runtime;
408 struct snd_pcm_status status;
409 int err;
410 if (!runtime) {
411 snd_iprintf(buffer, "closed\n");
412 return;
413 }
414 memset(&status, 0, sizeof(status));
415 err = snd_pcm_status(substream, &status);
416 if (err < 0) {
417 snd_iprintf(buffer, "error %d\n", err);
418 return;
419 }
420 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
421 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
422 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
423 snd_iprintf(buffer, "tstamp : %ld.%09ld\n",
424 status.tstamp.tv_sec, status.tstamp.tv_nsec);
425 snd_iprintf(buffer, "delay : %ld\n", status.delay);
426 snd_iprintf(buffer, "avail : %ld\n", status.avail);
427 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
428 snd_iprintf(buffer, "-----\n");
429 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
430 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
431 }
432
433 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
434 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
435 struct snd_info_buffer *buffer)
436 {
437 struct snd_pcm_str *pstr = entry->private_data;
438 snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
439 }
440
441 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
442 struct snd_info_buffer *buffer)
443 {
444 struct snd_pcm_str *pstr = entry->private_data;
445 char line[64];
446 if (!snd_info_get_line(buffer, line, sizeof(line)))
447 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
448 }
449 #endif
450
451 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
452 {
453 struct snd_pcm *pcm = pstr->pcm;
454 struct snd_info_entry *entry;
455 char name[16];
456
457 sprintf(name, "pcm%i%c", pcm->device,
458 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
459 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
460 return -ENOMEM;
461 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
462 if (snd_info_register(entry) < 0) {
463 snd_info_free_entry(entry);
464 return -ENOMEM;
465 }
466 pstr->proc_root = entry;
467
468 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
469 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
470 if (snd_info_register(entry) < 0) {
471 snd_info_free_entry(entry);
472 entry = NULL;
473 }
474 }
475 pstr->proc_info_entry = entry;
476
477 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
478 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
479 pstr->proc_root)) != NULL) {
480 entry->c.text.read = snd_pcm_xrun_debug_read;
481 entry->c.text.write = snd_pcm_xrun_debug_write;
482 entry->mode |= S_IWUSR;
483 entry->private_data = pstr;
484 if (snd_info_register(entry) < 0) {
485 snd_info_free_entry(entry);
486 entry = NULL;
487 }
488 }
489 pstr->proc_xrun_debug_entry = entry;
490 #endif
491 return 0;
492 }
493
494 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
495 {
496 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
497 if (pstr->proc_xrun_debug_entry) {
498 snd_info_unregister(pstr->proc_xrun_debug_entry);
499 pstr->proc_xrun_debug_entry = NULL;
500 }
501 #endif
502 if (pstr->proc_info_entry) {
503 snd_info_unregister(pstr->proc_info_entry);
504 pstr->proc_info_entry = NULL;
505 }
506 if (pstr->proc_root) {
507 snd_info_unregister(pstr->proc_root);
508 pstr->proc_root = NULL;
509 }
510 return 0;
511 }
512
513 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
514 {
515 struct snd_info_entry *entry;
516 struct snd_card *card;
517 char name[16];
518
519 card = substream->pcm->card;
520
521 sprintf(name, "sub%i", substream->number);
522 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
523 return -ENOMEM;
524 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
525 if (snd_info_register(entry) < 0) {
526 snd_info_free_entry(entry);
527 return -ENOMEM;
528 }
529 substream->proc_root = entry;
530
531 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
532 snd_info_set_text_ops(entry, substream,
533 snd_pcm_substream_proc_info_read);
534 if (snd_info_register(entry) < 0) {
535 snd_info_free_entry(entry);
536 entry = NULL;
537 }
538 }
539 substream->proc_info_entry = entry;
540
541 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
542 snd_info_set_text_ops(entry, substream,
543 snd_pcm_substream_proc_hw_params_read);
544 if (snd_info_register(entry) < 0) {
545 snd_info_free_entry(entry);
546 entry = NULL;
547 }
548 }
549 substream->proc_hw_params_entry = entry;
550
551 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
552 snd_info_set_text_ops(entry, substream,
553 snd_pcm_substream_proc_sw_params_read);
554 if (snd_info_register(entry) < 0) {
555 snd_info_free_entry(entry);
556 entry = NULL;
557 }
558 }
559 substream->proc_sw_params_entry = entry;
560
561 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
562 snd_info_set_text_ops(entry, substream,
563 snd_pcm_substream_proc_status_read);
564 if (snd_info_register(entry) < 0) {
565 snd_info_free_entry(entry);
566 entry = NULL;
567 }
568 }
569 substream->proc_status_entry = entry;
570
571 return 0;
572 }
573
574 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
575 {
576 if (substream->proc_info_entry) {
577 snd_info_unregister(substream->proc_info_entry);
578 substream->proc_info_entry = NULL;
579 }
580 if (substream->proc_hw_params_entry) {
581 snd_info_unregister(substream->proc_hw_params_entry);
582 substream->proc_hw_params_entry = NULL;
583 }
584 if (substream->proc_sw_params_entry) {
585 snd_info_unregister(substream->proc_sw_params_entry);
586 substream->proc_sw_params_entry = NULL;
587 }
588 if (substream->proc_status_entry) {
589 snd_info_unregister(substream->proc_status_entry);
590 substream->proc_status_entry = NULL;
591 }
592 if (substream->proc_root) {
593 snd_info_unregister(substream->proc_root);
594 substream->proc_root = NULL;
595 }
596 return 0;
597 }
598 #else /* !CONFIG_SND_VERBOSE_PROCFS */
599 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
600 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
601 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
602 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
603 #endif /* CONFIG_SND_VERBOSE_PROCFS */
604
605 /**
606 * snd_pcm_new_stream - create a new PCM stream
607 * @pcm: the pcm instance
608 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
609 * @substream_count: the number of substreams
610 *
611 * Creates a new stream for the pcm.
612 * The corresponding stream on the pcm must have been empty before
613 * calling this, i.e. zero must be given to the argument of
614 * snd_pcm_new().
615 *
616 * Returns zero if successful, or a negative error code on failure.
617 */
618 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
619 {
620 int idx, err;
621 struct snd_pcm_str *pstr = &pcm->streams[stream];
622 struct snd_pcm_substream *substream, *prev;
623
624 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
625 mutex_init(&pstr->oss.setup_mutex);
626 #endif
627 pstr->stream = stream;
628 pstr->pcm = pcm;
629 pstr->substream_count = substream_count;
630 if (substream_count > 0) {
631 err = snd_pcm_stream_proc_init(pstr);
632 if (err < 0) {
633 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
634 return err;
635 }
636 }
637 prev = NULL;
638 for (idx = 0, prev = NULL; idx < substream_count; idx++) {
639 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
640 if (substream == NULL) {
641 snd_printk(KERN_ERR "Cannot allocate PCM substream\n");
642 return -ENOMEM;
643 }
644 substream->pcm = pcm;
645 substream->pstr = pstr;
646 substream->number = idx;
647 substream->stream = stream;
648 sprintf(substream->name, "subdevice #%i", idx);
649 substream->buffer_bytes_max = UINT_MAX;
650 if (prev == NULL)
651 pstr->substream = substream;
652 else
653 prev->next = substream;
654 err = snd_pcm_substream_proc_init(substream);
655 if (err < 0) {
656 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
657 kfree(substream);
658 return err;
659 }
660 substream->group = &substream->self_group;
661 spin_lock_init(&substream->self_group.lock);
662 INIT_LIST_HEAD(&substream->self_group.substreams);
663 list_add_tail(&substream->link_list, &substream->self_group.substreams);
664 spin_lock_init(&substream->timer_lock);
665 atomic_set(&substream->mmap_count, 0);
666 prev = substream;
667 }
668 return 0;
669 }
670
671 EXPORT_SYMBOL(snd_pcm_new_stream);
672
673 /**
674 * snd_pcm_new - create a new PCM instance
675 * @card: the card instance
676 * @id: the id string
677 * @device: the device index (zero based)
678 * @playback_count: the number of substreams for playback
679 * @capture_count: the number of substreams for capture
680 * @rpcm: the pointer to store the new pcm instance
681 *
682 * Creates a new PCM instance.
683 *
684 * The pcm operators have to be set afterwards to the new instance
685 * via snd_pcm_set_ops().
686 *
687 * Returns zero if successful, or a negative error code on failure.
688 */
689 int snd_pcm_new(struct snd_card *card, char *id, int device,
690 int playback_count, int capture_count,
691 struct snd_pcm ** rpcm)
692 {
693 struct snd_pcm *pcm;
694 int err;
695 static struct snd_device_ops ops = {
696 .dev_free = snd_pcm_dev_free,
697 .dev_register = snd_pcm_dev_register,
698 .dev_disconnect = snd_pcm_dev_disconnect,
699 .dev_unregister = snd_pcm_dev_unregister
700 };
701
702 snd_assert(rpcm != NULL, return -EINVAL);
703 *rpcm = NULL;
704 snd_assert(card != NULL, return -ENXIO);
705 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
706 if (pcm == NULL) {
707 snd_printk(KERN_ERR "Cannot allocate PCM\n");
708 return -ENOMEM;
709 }
710 pcm->card = card;
711 pcm->device = device;
712 if (id)
713 strlcpy(pcm->id, id, sizeof(pcm->id));
714 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
715 snd_pcm_free(pcm);
716 return err;
717 }
718 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
719 snd_pcm_free(pcm);
720 return err;
721 }
722 mutex_init(&pcm->open_mutex);
723 init_waitqueue_head(&pcm->open_wait);
724 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
725 snd_pcm_free(pcm);
726 return err;
727 }
728 *rpcm = pcm;
729 return 0;
730 }
731
732 EXPORT_SYMBOL(snd_pcm_new);
733
734 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
735 {
736 struct snd_pcm_substream *substream, *substream_next;
737 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
738 struct snd_pcm_oss_setup *setup, *setupn;
739 #endif
740 substream = pstr->substream;
741 while (substream) {
742 substream_next = substream->next;
743 snd_pcm_substream_proc_done(substream);
744 kfree(substream);
745 substream = substream_next;
746 }
747 snd_pcm_stream_proc_done(pstr);
748 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
749 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
750 setupn = setup->next;
751 kfree(setup->task_name);
752 kfree(setup);
753 }
754 #endif
755 }
756
757 static int snd_pcm_free(struct snd_pcm *pcm)
758 {
759 snd_assert(pcm != NULL, return -ENXIO);
760 if (pcm->private_free)
761 pcm->private_free(pcm);
762 snd_pcm_lib_preallocate_free_for_all(pcm);
763 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
764 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
765 kfree(pcm);
766 return 0;
767 }
768
769 static int snd_pcm_dev_free(struct snd_device *device)
770 {
771 struct snd_pcm *pcm = device->device_data;
772 return snd_pcm_free(pcm);
773 }
774
775 static void snd_pcm_tick_timer_func(unsigned long data)
776 {
777 struct snd_pcm_substream *substream = (struct snd_pcm_substream *) data;
778 snd_pcm_tick_elapsed(substream);
779 }
780
781 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
782 struct file *file,
783 struct snd_pcm_substream **rsubstream)
784 {
785 struct snd_pcm_str * pstr;
786 struct snd_pcm_substream *substream;
787 struct snd_pcm_runtime *runtime;
788 struct snd_ctl_file *kctl;
789 struct snd_card *card;
790 struct list_head *list;
791 int prefer_subdevice = -1;
792 size_t size;
793
794 snd_assert(rsubstream != NULL, return -EINVAL);
795 *rsubstream = NULL;
796 snd_assert(pcm != NULL, return -ENXIO);
797 pstr = &pcm->streams[stream];
798 if (pstr->substream == NULL || pstr->substream_count == 0)
799 return -ENODEV;
800
801 card = pcm->card;
802 down_read(&card->controls_rwsem);
803 list_for_each(list, &card->ctl_files) {
804 kctl = snd_ctl_file(list);
805 if (kctl->pid == current->pid) {
806 prefer_subdevice = kctl->prefer_pcm_subdevice;
807 break;
808 }
809 }
810 up_read(&card->controls_rwsem);
811
812 switch (stream) {
813 case SNDRV_PCM_STREAM_PLAYBACK:
814 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
815 for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
816 if (SUBSTREAM_BUSY(substream))
817 return -EAGAIN;
818 }
819 }
820 break;
821 case SNDRV_PCM_STREAM_CAPTURE:
822 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
823 for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
824 if (SUBSTREAM_BUSY(substream))
825 return -EAGAIN;
826 }
827 }
828 break;
829 default:
830 return -EINVAL;
831 }
832
833 if (file->f_flags & O_APPEND) {
834 if (prefer_subdevice < 0) {
835 if (pstr->substream_count > 1)
836 return -EINVAL; /* must be unique */
837 substream = pstr->substream;
838 } else {
839 for (substream = pstr->substream; substream;
840 substream = substream->next)
841 if (substream->number == prefer_subdevice)
842 break;
843 }
844 if (! substream)
845 return -ENODEV;
846 if (! SUBSTREAM_BUSY(substream))
847 return -EBADFD;
848 substream->ref_count++;
849 *rsubstream = substream;
850 return 0;
851 }
852
853 if (prefer_subdevice >= 0) {
854 for (substream = pstr->substream; substream; substream = substream->next)
855 if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
856 goto __ok;
857 }
858 for (substream = pstr->substream; substream; substream = substream->next)
859 if (!SUBSTREAM_BUSY(substream))
860 break;
861 __ok:
862 if (substream == NULL)
863 return -EAGAIN;
864
865 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
866 if (runtime == NULL)
867 return -ENOMEM;
868
869 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
870 runtime->status = snd_malloc_pages(size, GFP_KERNEL);
871 if (runtime->status == NULL) {
872 kfree(runtime);
873 return -ENOMEM;
874 }
875 memset((void*)runtime->status, 0, size);
876
877 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
878 runtime->control = snd_malloc_pages(size, GFP_KERNEL);
879 if (runtime->control == NULL) {
880 snd_free_pages((void*)runtime->status,
881 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
882 kfree(runtime);
883 return -ENOMEM;
884 }
885 memset((void*)runtime->control, 0, size);
886
887 init_waitqueue_head(&runtime->sleep);
888 init_timer(&runtime->tick_timer);
889 runtime->tick_timer.function = snd_pcm_tick_timer_func;
890 runtime->tick_timer.data = (unsigned long) substream;
891
892 runtime->status->state = SNDRV_PCM_STATE_OPEN;
893
894 substream->runtime = runtime;
895 substream->private_data = pcm->private_data;
896 substream->ref_count = 1;
897 substream->f_flags = file->f_flags;
898 pstr->substream_opened++;
899 *rsubstream = substream;
900 return 0;
901 }
902
903 void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
904 {
905 struct snd_pcm_runtime *runtime;
906
907 runtime = substream->runtime;
908 snd_assert(runtime != NULL, return);
909 if (runtime->private_free != NULL)
910 runtime->private_free(runtime);
911 snd_free_pages((void*)runtime->status,
912 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
913 snd_free_pages((void*)runtime->control,
914 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
915 kfree(runtime->hw_constraints.rules);
916 kfree(runtime);
917 substream->runtime = NULL;
918 substream->pstr->substream_opened--;
919 }
920
921 static int snd_pcm_dev_register(struct snd_device *device)
922 {
923 int cidx, err;
924 struct snd_pcm_substream *substream;
925 struct list_head *list;
926 char str[16];
927 struct snd_pcm *pcm = device->device_data;
928
929 snd_assert(pcm != NULL && device != NULL, return -ENXIO);
930 mutex_lock(&register_mutex);
931 if (snd_pcm_search(pcm->card, pcm->device)) {
932 mutex_unlock(&register_mutex);
933 return -EBUSY;
934 }
935 list_add_tail(&pcm->list, &snd_pcm_devices);
936 for (cidx = 0; cidx < 2; cidx++) {
937 int devtype = -1;
938 if (pcm->streams[cidx].substream == NULL)
939 continue;
940 switch (cidx) {
941 case SNDRV_PCM_STREAM_PLAYBACK:
942 sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
943 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
944 break;
945 case SNDRV_PCM_STREAM_CAPTURE:
946 sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
947 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
948 break;
949 }
950 if ((err = snd_register_device(devtype, pcm->card,
951 pcm->device,
952 &snd_pcm_f_ops[cidx],
953 pcm, str)) < 0)
954 {
955 list_del(&pcm->list);
956 mutex_unlock(&register_mutex);
957 return err;
958 }
959 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
960 snd_pcm_timer_init(substream);
961 }
962 list_for_each(list, &snd_pcm_notify_list) {
963 struct snd_pcm_notify *notify;
964 notify = list_entry(list, struct snd_pcm_notify, list);
965 notify->n_register(pcm);
966 }
967 mutex_unlock(&register_mutex);
968 return 0;
969 }
970
971 static int snd_pcm_dev_disconnect(struct snd_device *device)
972 {
973 struct snd_pcm *pcm = device->device_data;
974 struct list_head *list;
975 struct snd_pcm_substream *substream;
976 int cidx;
977
978 mutex_lock(&register_mutex);
979 list_del_init(&pcm->list);
980 for (cidx = 0; cidx < 2; cidx++)
981 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
982 if (substream->runtime)
983 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
984 list_for_each(list, &snd_pcm_notify_list) {
985 struct snd_pcm_notify *notify;
986 notify = list_entry(list, struct snd_pcm_notify, list);
987 notify->n_disconnect(pcm);
988 }
989 mutex_unlock(&register_mutex);
990 return 0;
991 }
992
993 static int snd_pcm_dev_unregister(struct snd_device *device)
994 {
995 int cidx, devtype;
996 struct snd_pcm_substream *substream;
997 struct list_head *list;
998 struct snd_pcm *pcm = device->device_data;
999
1000 snd_assert(pcm != NULL, return -ENXIO);
1001 mutex_lock(&register_mutex);
1002 list_del(&pcm->list);
1003 for (cidx = 0; cidx < 2; cidx++) {
1004 devtype = -1;
1005 switch (cidx) {
1006 case SNDRV_PCM_STREAM_PLAYBACK:
1007 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1008 break;
1009 case SNDRV_PCM_STREAM_CAPTURE:
1010 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1011 break;
1012 }
1013 snd_unregister_device(devtype, pcm->card, pcm->device);
1014 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1015 snd_pcm_timer_done(substream);
1016 }
1017 list_for_each(list, &snd_pcm_notify_list) {
1018 struct snd_pcm_notify *notify;
1019 notify = list_entry(list, struct snd_pcm_notify, list);
1020 notify->n_unregister(pcm);
1021 }
1022 mutex_unlock(&register_mutex);
1023 return snd_pcm_free(pcm);
1024 }
1025
1026 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1027 {
1028 struct list_head *p;
1029
1030 snd_assert(notify != NULL && notify->n_register != NULL && notify->n_unregister != NULL, return -EINVAL);
1031 mutex_lock(&register_mutex);
1032 if (nfree) {
1033 list_del(&notify->list);
1034 list_for_each(p, &snd_pcm_devices)
1035 notify->n_unregister(list_entry(p,
1036 struct snd_pcm, list));
1037 } else {
1038 list_add_tail(&notify->list, &snd_pcm_notify_list);
1039 list_for_each(p, &snd_pcm_devices)
1040 notify->n_register(list_entry(p, struct snd_pcm, list));
1041 }
1042 mutex_unlock(&register_mutex);
1043 return 0;
1044 }
1045
1046 EXPORT_SYMBOL(snd_pcm_notify);
1047
1048 #ifdef CONFIG_PROC_FS
1049 /*
1050 * Info interface
1051 */
1052
1053 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1054 struct snd_info_buffer *buffer)
1055 {
1056 struct list_head *p;
1057 struct snd_pcm *pcm;
1058
1059 mutex_lock(&register_mutex);
1060 list_for_each(p, &snd_pcm_devices) {
1061 pcm = list_entry(p, struct snd_pcm, list);
1062 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1063 pcm->card->number, pcm->device, pcm->id, pcm->name);
1064 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1065 snd_iprintf(buffer, " : playback %i",
1066 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1067 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1068 snd_iprintf(buffer, " : capture %i",
1069 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1070 snd_iprintf(buffer, "\n");
1071 }
1072 mutex_unlock(&register_mutex);
1073 }
1074
1075 static struct snd_info_entry *snd_pcm_proc_entry;
1076
1077 static void snd_pcm_proc_init(void)
1078 {
1079 struct snd_info_entry *entry;
1080
1081 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1082 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1083 if (snd_info_register(entry) < 0) {
1084 snd_info_free_entry(entry);
1085 entry = NULL;
1086 }
1087 }
1088 snd_pcm_proc_entry = entry;
1089 }
1090
1091 static void snd_pcm_proc_done(void)
1092 {
1093 if (snd_pcm_proc_entry)
1094 snd_info_unregister(snd_pcm_proc_entry);
1095 }
1096
1097 #else /* !CONFIG_PROC_FS */
1098 #define snd_pcm_proc_init()
1099 #define snd_pcm_proc_done()
1100 #endif /* CONFIG_PROC_FS */
1101
1102
1103 /*
1104 * ENTRY functions
1105 */
1106
1107 static int __init alsa_pcm_init(void)
1108 {
1109 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1110 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1111 snd_pcm_proc_init();
1112 return 0;
1113 }
1114
1115 static void __exit alsa_pcm_exit(void)
1116 {
1117 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1118 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1119 snd_pcm_proc_done();
1120 }
1121
1122 module_init(alsa_pcm_init)
1123 module_exit(alsa_pcm_exit)
WRT350N Kernel Patches