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[ALSA] Merge ad1816a-lib module to ad1816a
[deliverable/linux.git] / sound / core / pcm.c
CommitLineData
1da177e4
LT		 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 <sound/core.h>
27#include <sound/minors.h>
28#include <sound/pcm.h>
29#include <sound/control.h>
30#include <sound/info.h>
31
32MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Abramo Bagnara <abramo@alsa-project.org>");
33MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
34MODULE_LICENSE("GPL");
35
877211f5 36struct snd_pcm *snd_pcm_devices[SNDRV_CARDS * SNDRV_PCM_DEVICES];
1da177e4
LT		 37static LIST_HEAD(snd_pcm_notify_list);
38static DECLARE_MUTEX(register_mutex);
39
877211f5
TI		 40static int snd_pcm_free(struct snd_pcm *pcm);
41static int snd_pcm_dev_free(struct snd_device *device);
42static int snd_pcm_dev_register(struct snd_device *device);
43static int snd_pcm_dev_disconnect(struct snd_device *device);
44static int snd_pcm_dev_unregister(struct snd_device *device);
1da177e4 45
877211f5
TI		 46static int snd_pcm_control_ioctl(struct snd_card *card,
47 struct snd_ctl_file *control,
1da177e4
LT		 48 unsigned int cmd, unsigned long arg)
49{
50 unsigned int tmp;
51
52 tmp = card->number * SNDRV_PCM_DEVICES;
53 switch (cmd) {
54 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
55 {
56 int device;
57
58 if (get_user(device, (int __user *)arg))
59 return -EFAULT;
60 device = device < 0 ? 0 : device + 1;
61 while (device < SNDRV_PCM_DEVICES) {
62 if (snd_pcm_devices[tmp + device])
63 break;
64 device++;
65 }
66 if (device == SNDRV_PCM_DEVICES)
67 device = -1;
68 if (put_user(device, (int __user *)arg))
69 return -EFAULT;
70 return 0;
71 }
72 case SNDRV_CTL_IOCTL_PCM_INFO:
73 {
877211f5 74 struct snd_pcm_info __user *info;
1da177e4 75 unsigned int device, subdevice;
877211f5
TI		 76 int stream;
77 struct snd_pcm *pcm;
78 struct snd_pcm_str *pstr;
79 struct snd_pcm_substream *substream;
80 info = (struct snd_pcm_info __user *)arg;
1da177e4
LT		 81 if (get_user(device, &info->device))
82 return -EFAULT;
83 if (device >= SNDRV_PCM_DEVICES)
84 return -ENXIO;
85 pcm = snd_pcm_devices[tmp + device];
86 if (pcm == NULL)
87 return -ENXIO;
88 if (get_user(stream, &info->stream))
89 return -EFAULT;
90 if (stream < 0 || stream > 1)
91 return -EINVAL;
92 pstr = &pcm->streams[stream];
93 if (pstr->substream_count == 0)
94 return -ENOENT;
95 if (get_user(subdevice, &info->subdevice))
96 return -EFAULT;
97 if (subdevice >= pstr->substream_count)
98 return -ENXIO;
99 for (substream = pstr->substream; substream; substream = substream->next)
100 if (substream->number == (int)subdevice)
101 break;
102 if (substream == NULL)
103 return -ENXIO;
104 return snd_pcm_info_user(substream, info);
105 }
106 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
107 {
108 int val;
109
110 if (get_user(val, (int __user *)arg))
111 return -EFAULT;
112 control->prefer_pcm_subdevice = val;
113 return 0;
114 }
115 }
116 return -ENOIOCTLCMD;
117}
118#define STATE(v) [SNDRV_PCM_STATE_##v] = #v
119#define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
120#define READY(v) [SNDRV_PCM_READY_##v] = #v
121#define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
122#define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
123#define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
124#define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
125#define START(v) [SNDRV_PCM_START_##v] = #v
126#define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
127#define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
128
129static char *snd_pcm_stream_names[] = {
130 STREAM(PLAYBACK),
131 STREAM(CAPTURE),
132};
133
134static char *snd_pcm_state_names[] = {
135 STATE(OPEN),
136 STATE(SETUP),
137 STATE(PREPARED),
138 STATE(RUNNING),
139 STATE(XRUN),
140 STATE(DRAINING),
141 STATE(PAUSED),
142 STATE(SUSPENDED),
143};
144
145static char *snd_pcm_access_names[] = {
146 ACCESS(MMAP_INTERLEAVED),
147 ACCESS(MMAP_NONINTERLEAVED),
148 ACCESS(MMAP_COMPLEX),
149 ACCESS(RW_INTERLEAVED),
150 ACCESS(RW_NONINTERLEAVED),
151};
152
153static char *snd_pcm_format_names[] = {
154 FORMAT(S8),
155 FORMAT(U8),
156 FORMAT(S16_LE),
157 FORMAT(S16_BE),
158 FORMAT(U16_LE),
159 FORMAT(U16_BE),
160 FORMAT(S24_LE),
161 FORMAT(S24_BE),
162 FORMAT(U24_LE),
163 FORMAT(U24_BE),
164 FORMAT(S32_LE),
165 FORMAT(S32_BE),
166 FORMAT(U32_LE),
167 FORMAT(U32_BE),
168 FORMAT(FLOAT_LE),
169 FORMAT(FLOAT_BE),
170 FORMAT(FLOAT64_LE),
171 FORMAT(FLOAT64_BE),
172 FORMAT(IEC958_SUBFRAME_LE),
173 FORMAT(IEC958_SUBFRAME_BE),
174 FORMAT(MU_LAW),
175 FORMAT(A_LAW),
176 FORMAT(IMA_ADPCM),
177 FORMAT(MPEG),
178 FORMAT(GSM),
179 FORMAT(SPECIAL),
180 FORMAT(S24_3LE),
181 FORMAT(S24_3BE),
182 FORMAT(U24_3LE),
183 FORMAT(U24_3BE),
184 FORMAT(S20_3LE),
185 FORMAT(S20_3BE),
186 FORMAT(U20_3LE),
187 FORMAT(U20_3BE),
188 FORMAT(S18_3LE),
189 FORMAT(S18_3BE),
190 FORMAT(U18_3LE),
191 FORMAT(U18_3BE),
192};
193
194static char *snd_pcm_subformat_names[] = {
195 SUBFORMAT(STD),
196};
197
198static char *snd_pcm_tstamp_mode_names[] = {
199 TSTAMP(NONE),
200 TSTAMP(MMAP),
201};
202
877211f5 203static const char *snd_pcm_stream_name(int stream)
1da177e4
LT		 204{
205 snd_assert(stream <= SNDRV_PCM_STREAM_LAST, return NULL);
206 return snd_pcm_stream_names[stream];
207}
208
209static const char *snd_pcm_access_name(snd_pcm_access_t access)
210{
1da177e4
LT		 211 return snd_pcm_access_names[access];
212}
213
214const char *snd_pcm_format_name(snd_pcm_format_t format)
215{
1da177e4
LT		 216 return snd_pcm_format_names[format];
217}
218
219static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
220{
1da177e4
LT		 221 return snd_pcm_subformat_names[subformat];
222}
223
877211f5 224static const char *snd_pcm_tstamp_mode_name(int mode)
1da177e4
LT		 225{
226 snd_assert(mode <= SNDRV_PCM_TSTAMP_LAST, return NULL);
227 return snd_pcm_tstamp_mode_names[mode];
228}
229
230static const char *snd_pcm_state_name(snd_pcm_state_t state)
231{
1da177e4
LT		 232 return snd_pcm_state_names[state];
233}
234
235#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
236#include <linux/soundcard.h>
237static const char *snd_pcm_oss_format_name(int format)
238{
239 switch (format) {
240 case AFMT_MU_LAW:
241 return "MU_LAW";
242 case AFMT_A_LAW:
243 return "A_LAW";
244 case AFMT_IMA_ADPCM:
245 return "IMA_ADPCM";
246 case AFMT_U8:
247 return "U8";
248 case AFMT_S16_LE:
249 return "S16_LE";
250 case AFMT_S16_BE:
251 return "S16_BE";
252 case AFMT_S8:
253 return "S8";
254 case AFMT_U16_LE:
255 return "U16_LE";
256 case AFMT_U16_BE:
257 return "U16_BE";
258 case AFMT_MPEG:
259 return "MPEG";
260 default:
261 return "unknown";
262 }
263}
264#endif
265
266#ifdef CONFIG_PROC_FS
877211f5
TI		 267static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
268 struct snd_info_buffer *buffer)
1da177e4 269{
877211f5 270 struct snd_pcm_info *info;
1da177e4
LT		 271 int err;
272
7c22f1aa
TI		 273 if (! substream)
274 return;
1da177e4
LT		 275
276 info = kmalloc(sizeof(*info), GFP_KERNEL);
277 if (! info) {
278 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
279 return;
280 }
281
282 err = snd_pcm_info(substream, info);
283 if (err < 0) {
284 snd_iprintf(buffer, "error %d\n", err);
285 kfree(info);
286 return;
287 }
288 snd_iprintf(buffer, "card: %d\n", info->card);
289 snd_iprintf(buffer, "device: %d\n", info->device);
290 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
291 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
292 snd_iprintf(buffer, "id: %s\n", info->id);
293 snd_iprintf(buffer, "name: %s\n", info->name);
294 snd_iprintf(buffer, "subname: %s\n", info->subname);
295 snd_iprintf(buffer, "class: %d\n", info->dev_class);
296 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
297 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
298 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
299 kfree(info);
300}
301
877211f5
TI		 302static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
303 struct snd_info_buffer *buffer)
1da177e4 304{
877211f5
TI		 305 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
306 buffer);
1da177e4
LT		 307}
308
877211f5
TI		 309static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
310 struct snd_info_buffer *buffer)
1da177e4 311{
877211f5
TI		 312 snd_pcm_proc_info_read((struct snd_pcm_substream *)entry->private_data,
313 buffer);
1da177e4
LT		 314}
315
877211f5
TI		 316static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
317 struct snd_info_buffer *buffer)
1da177e4 318{
877211f5
TI		 319 struct snd_pcm_substream *substream = entry->private_data;
320 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 321 if (!runtime) {
322 snd_iprintf(buffer, "closed\n");
323 return;
324 }
325 snd_pcm_stream_lock_irq(substream);
326 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
327 snd_iprintf(buffer, "no setup\n");
328 snd_pcm_stream_unlock_irq(substream);
329 return;
330 }
331 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
332 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
333 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
334 snd_iprintf(buffer, "channels: %u\n", runtime->channels);
335 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
336 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
337 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
338 snd_iprintf(buffer, "tick_time: %u\n", runtime->tick_time);
339#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
340 if (substream->oss.oss) {
341 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
342 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
343 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
344 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
345 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
346 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
347 }
348#endif
349 snd_pcm_stream_unlock_irq(substream);
350}
351
877211f5
TI		 352static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
353 struct snd_info_buffer *buffer)
1da177e4 354{
877211f5
TI		 355 struct snd_pcm_substream *substream = entry->private_data;
356 struct snd_pcm_runtime *runtime = substream->runtime;
1da177e4
LT		 357 if (!runtime) {
358 snd_iprintf(buffer, "closed\n");
359 return;
360 }
361 snd_pcm_stream_lock_irq(substream);
362 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
363 snd_iprintf(buffer, "no setup\n");
364 snd_pcm_stream_unlock_irq(substream);
365 return;
366 }
367 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
368 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
369 snd_iprintf(buffer, "sleep_min: %u\n", runtime->sleep_min);
370 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
371 snd_iprintf(buffer, "xfer_align: %lu\n", runtime->xfer_align);
372 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
373 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
374 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
375 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
376 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
377 snd_pcm_stream_unlock_irq(substream);
378}
379
877211f5
TI		 380static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
381 struct snd_info_buffer *buffer)
1da177e4 382{
877211f5
TI		 383 struct snd_pcm_substream *substream = entry->private_data;
384 struct snd_pcm_runtime *runtime = substream->runtime;
385 struct snd_pcm_status status;
1da177e4
LT		 386 int err;
387 if (!runtime) {
388 snd_iprintf(buffer, "closed\n");
389 return;
390 }
391 memset(&status, 0, sizeof(status));
392 err = snd_pcm_status(substream, &status);
393 if (err < 0) {
394 snd_iprintf(buffer, "error %d\n", err);
395 return;
396 }
397 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
398 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
399 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
400 snd_iprintf(buffer, "tstamp : %ld.%09ld\n",
401 status.tstamp.tv_sec, status.tstamp.tv_nsec);
402 snd_iprintf(buffer, "delay : %ld\n", status.delay);
403 snd_iprintf(buffer, "avail : %ld\n", status.avail);
404 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
405 snd_iprintf(buffer, "-----\n");
406 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
407 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
408}
409#endif
410
411#ifdef CONFIG_SND_DEBUG
877211f5
TI		 412static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
413 struct snd_info_buffer *buffer)
1da177e4 414{
877211f5 415 struct snd_pcm_str *pstr = entry->private_data;
1da177e4
LT		 416 snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
417}
418
877211f5
TI		 419static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
420 struct snd_info_buffer *buffer)
1da177e4 421{
877211f5 422 struct snd_pcm_str *pstr = entry->private_data;
1da177e4
LT		 423 char line[64];
424 if (!snd_info_get_line(buffer, line, sizeof(line)))
425 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
426}
427#endif
428
877211f5 429static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
1da177e4 430{
877211f5
TI		 431 struct snd_pcm *pcm = pstr->pcm;
432 struct snd_info_entry *entry;
1da177e4
LT		 433 char name[16];
434
435 sprintf(name, "pcm%i%c", pcm->device,
436 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
437 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
438 return -ENOMEM;
439 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
440 if (snd_info_register(entry) < 0) {
441 snd_info_free_entry(entry);
442 return -ENOMEM;
443 }
444 pstr->proc_root = entry;
445
446 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
447 snd_info_set_text_ops(entry, pstr, 256, snd_pcm_stream_proc_info_read);
448 if (snd_info_register(entry) < 0) {
449 snd_info_free_entry(entry);
450 entry = NULL;
451 }
452 }
453 pstr->proc_info_entry = entry;
454
455#ifdef CONFIG_SND_DEBUG
877211f5
TI		 456 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
457 pstr->proc_root)) != NULL) {
1da177e4
LT		 458 entry->c.text.read_size = 64;
459 entry->c.text.read = snd_pcm_xrun_debug_read;
460 entry->c.text.write_size = 64;
461 entry->c.text.write = snd_pcm_xrun_debug_write;
bd7bf042 462 entry->mode |= S_IWUSR;
1da177e4
LT		 463 entry->private_data = pstr;
464 if (snd_info_register(entry) < 0) {
465 snd_info_free_entry(entry);
466 entry = NULL;
467 }
468 }
469 pstr->proc_xrun_debug_entry = entry;
470#endif
471 return 0;
472}
473
877211f5 474static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
1da177e4
LT		 475{
476#ifdef CONFIG_SND_DEBUG
477 if (pstr->proc_xrun_debug_entry) {
478 snd_info_unregister(pstr->proc_xrun_debug_entry);
479 pstr->proc_xrun_debug_entry = NULL;
480 }
481#endif
482 if (pstr->proc_info_entry) {
483 snd_info_unregister(pstr->proc_info_entry);
484 pstr->proc_info_entry = NULL;
485 }
486 if (pstr->proc_root) {
487 snd_info_unregister(pstr->proc_root);
488 pstr->proc_root = NULL;
489 }
490 return 0;
491}
492
877211f5 493static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
1da177e4 494{
877211f5
TI		 495 struct snd_info_entry *entry;
496 struct snd_card *card;
1da177e4
LT		 497 char name[16];
498
499 card = substream->pcm->card;
500
501 sprintf(name, "sub%i", substream->number);
502 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
503 return -ENOMEM;
504 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
505 if (snd_info_register(entry) < 0) {
506 snd_info_free_entry(entry);
507 return -ENOMEM;
508 }
509 substream->proc_root = entry;
510
511 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
512 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_info_read);
513 if (snd_info_register(entry) < 0) {
514 snd_info_free_entry(entry);
515 entry = NULL;
516 }
517 }
518 substream->proc_info_entry = entry;
519
520 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
521 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_hw_params_read);
522 if (snd_info_register(entry) < 0) {
523 snd_info_free_entry(entry);
524 entry = NULL;
525 }
526 }
527 substream->proc_hw_params_entry = entry;
528
529 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
530 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_sw_params_read);
531 if (snd_info_register(entry) < 0) {
532 snd_info_free_entry(entry);
533 entry = NULL;
534 }
535 }
536 substream->proc_sw_params_entry = entry;
537
538 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
539 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_status_read);
540 if (snd_info_register(entry) < 0) {
541 snd_info_free_entry(entry);
542 entry = NULL;
543 }
544 }
545 substream->proc_status_entry = entry;
546
547 return 0;
548}
549
877211f5 550static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
1da177e4
LT		 551{
552 if (substream->proc_info_entry) {
553 snd_info_unregister(substream->proc_info_entry);
554 substream->proc_info_entry = NULL;
555 }
556 if (substream->proc_hw_params_entry) {
557 snd_info_unregister(substream->proc_hw_params_entry);
558 substream->proc_hw_params_entry = NULL;
559 }
560 if (substream->proc_sw_params_entry) {
561 snd_info_unregister(substream->proc_sw_params_entry);
562 substream->proc_sw_params_entry = NULL;
563 }
564 if (substream->proc_status_entry) {
565 snd_info_unregister(substream->proc_status_entry);
566 substream->proc_status_entry = NULL;
567 }
568 if (substream->proc_root) {
569 snd_info_unregister(substream->proc_root);
570 substream->proc_root = NULL;
571 }
572 return 0;
573}
574
575/**
576 * snd_pcm_new_stream - create a new PCM stream
577 * @pcm: the pcm instance
578 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
579 * @substream_count: the number of substreams
580 *
581 * Creates a new stream for the pcm.
582 * The corresponding stream on the pcm must have been empty before
583 * calling this, i.e. zero must be given to the argument of
584 * snd_pcm_new().
585 *
586 * Returns zero if successful, or a negative error code on failure.
587 */
877211f5 588int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
1da177e4
LT		 589{
590 int idx, err;
877211f5
TI		 591 struct snd_pcm_str *pstr = &pcm->streams[stream];
592 struct snd_pcm_substream *substream, *prev;
1da177e4
LT		 593
594#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
595 init_MUTEX(&pstr->oss.setup_mutex);
596#endif
597 pstr->stream = stream;
598 pstr->pcm = pcm;
599 pstr->substream_count = substream_count;
600 pstr->reg = &snd_pcm_reg[stream];
601 if (substream_count > 0) {
602 err = snd_pcm_stream_proc_init(pstr);
603 if (err < 0)
604 return err;
605 }
606 prev = NULL;
607 for (idx = 0, prev = NULL; idx < substream_count; idx++) {
ca2c0966 608 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1da177e4
LT		 609 if (substream == NULL)
610 return -ENOMEM;
611 substream->pcm = pcm;
612 substream->pstr = pstr;
613 substream->number = idx;
614 substream->stream = stream;
615 sprintf(substream->name, "subdevice #%i", idx);
616 substream->buffer_bytes_max = UINT_MAX;
617 if (prev == NULL)
618 pstr->substream = substream;
619 else
620 prev->next = substream;
621 err = snd_pcm_substream_proc_init(substream);
622 if (err < 0) {
623 kfree(substream);
624 return err;
625 }
626 substream->group = &substream->self_group;
627 spin_lock_init(&substream->self_group.lock);
628 INIT_LIST_HEAD(&substream->self_group.substreams);
629 list_add_tail(&substream->link_list, &substream->self_group.substreams);
630 spin_lock_init(&substream->timer_lock);
631 prev = substream;
632 }
633 return 0;
634}
635
636/**
637 * snd_pcm_new - create a new PCM instance
638 * @card: the card instance
639 * @id: the id string
640 * @device: the device index (zero based)
641 * @playback_count: the number of substreams for playback
642 * @capture_count: the number of substreams for capture
643 * @rpcm: the pointer to store the new pcm instance
644 *
645 * Creates a new PCM instance.
646 *
647 * The pcm operators have to be set afterwards to the new instance
648 * via snd_pcm_set_ops().
649 *
650 * Returns zero if successful, or a negative error code on failure.
651 */
877211f5 652int snd_pcm_new(struct snd_card *card, char *id, int device,
1da177e4 653 int playback_count, int capture_count,
877211f5 654 struct snd_pcm ** rpcm)
1da177e4 655{
877211f5 656 struct snd_pcm *pcm;
1da177e4 657 int err;
877211f5 658 static struct snd_device_ops ops = {
1da177e4
LT		 659 .dev_free = snd_pcm_dev_free,
660 .dev_register = snd_pcm_dev_register,
661 .dev_disconnect = snd_pcm_dev_disconnect,
662 .dev_unregister = snd_pcm_dev_unregister
663 };
664
665 snd_assert(rpcm != NULL, return -EINVAL);
666 *rpcm = NULL;
667 snd_assert(card != NULL, return -ENXIO);
ca2c0966 668 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
1da177e4
LT		 669 if (pcm == NULL)
670 return -ENOMEM;
671 pcm->card = card;
672 pcm->device = device;
673 if (id) {
674 strlcpy(pcm->id, id, sizeof(pcm->id));
675 }
676 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
677 snd_pcm_free(pcm);
678 return err;
679 }
680 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
681 snd_pcm_free(pcm);
682 return err;
683 }
684 init_MUTEX(&pcm->open_mutex);
685 init_waitqueue_head(&pcm->open_wait);
686 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
687 snd_pcm_free(pcm);
688 return err;
689 }
690 *rpcm = pcm;
691 return 0;
692}
693
877211f5 694static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
1da177e4 695{
877211f5 696 struct snd_pcm_substream *substream, *substream_next;
1da177e4 697#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
877211f5 698 struct snd_pcm_oss_setup *setup, *setupn;
1da177e4
LT		 699#endif
700 substream = pstr->substream;
701 while (substream) {
702 substream_next = substream->next;
703 snd_pcm_substream_proc_done(substream);
704 kfree(substream);
705 substream = substream_next;
706 }
707 snd_pcm_stream_proc_done(pstr);
708#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
709 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
710 setupn = setup->next;
711 kfree(setup->task_name);
712 kfree(setup);
713 }
714#endif
715}
716
877211f5 717static int snd_pcm_free(struct snd_pcm *pcm)
1da177e4
LT		 718{
719 snd_assert(pcm != NULL, return -ENXIO);
720 if (pcm->private_free)
721 pcm->private_free(pcm);
722 snd_pcm_lib_preallocate_free_for_all(pcm);
723 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
724 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
725 kfree(pcm);
726 return 0;
727}
728
877211f5 729static int snd_pcm_dev_free(struct snd_device *device)
1da177e4 730{
877211f5 731 struct snd_pcm *pcm = device->device_data;
1da177e4
LT		 732 return snd_pcm_free(pcm);
733}
734
735static void snd_pcm_tick_timer_func(unsigned long data)
736{
877211f5 737 struct snd_pcm_substream *substream = (struct snd_pcm_substream *) data;
1da177e4
LT		 738 snd_pcm_tick_elapsed(substream);
739}
740
877211f5
TI		 741int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
742 struct snd_pcm_substream **rsubstream)
1da177e4 743{
877211f5
TI		 744 struct snd_pcm_str * pstr;
745 struct snd_pcm_substream *substream;
746 struct snd_pcm_runtime *runtime;
747 struct snd_ctl_file *kctl;
748 struct snd_card *card;
1da177e4
LT		 749 struct list_head *list;
750 int prefer_subdevice = -1;
751 size_t size;
752
753 snd_assert(rsubstream != NULL, return -EINVAL);
754 *rsubstream = NULL;
755 snd_assert(pcm != NULL, return -ENXIO);
756 pstr = &pcm->streams[stream];
757 if (pstr->substream == NULL)
758 return -ENODEV;
759
760 card = pcm->card;
761 down_read(&card->controls_rwsem);
762 list_for_each(list, &card->ctl_files) {
763 kctl = snd_ctl_file(list);
764 if (kctl->pid == current->pid) {
765 prefer_subdevice = kctl->prefer_pcm_subdevice;
766 break;
767 }
768 }
769 up_read(&card->controls_rwsem);
770
771 if (pstr->substream_count == 0)
772 return -ENODEV;
773 switch (stream) {
774 case SNDRV_PCM_STREAM_PLAYBACK:
775 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
776 for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
777 if (SUBSTREAM_BUSY(substream))
778 return -EAGAIN;
779 }
780 }
781 break;
782 case SNDRV_PCM_STREAM_CAPTURE:
783 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
784 for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
785 if (SUBSTREAM_BUSY(substream))
786 return -EAGAIN;
787 }
788 }
789 break;
790 default:
791 return -EINVAL;
792 }
793
794 if (prefer_subdevice >= 0) {
795 for (substream = pstr->substream; substream; substream = substream->next)
796 if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
797 goto __ok;
798 }
799 for (substream = pstr->substream; substream; substream = substream->next)
800 if (!SUBSTREAM_BUSY(substream))
801 break;
802 __ok:
803 if (substream == NULL)
804 return -EAGAIN;
805
ca2c0966 806 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
1da177e4
LT		 807 if (runtime == NULL)
808 return -ENOMEM;
809
877211f5 810 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
1da177e4
LT		 811 runtime->status = snd_malloc_pages(size, GFP_KERNEL);
812 if (runtime->status == NULL) {
813 kfree(runtime);
814 return -ENOMEM;
815 }
816 memset((void*)runtime->status, 0, size);
817
877211f5 818 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
1da177e4
LT		 819 runtime->control = snd_malloc_pages(size, GFP_KERNEL);
820 if (runtime->control == NULL) {
877211f5
TI		 821 snd_free_pages((void*)runtime->status,
822 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
1da177e4
LT		 823 kfree(runtime);
824 return -ENOMEM;
825 }
826 memset((void*)runtime->control, 0, size);
827
828 init_waitqueue_head(&runtime->sleep);
829 atomic_set(&runtime->mmap_count, 0);
830 init_timer(&runtime->tick_timer);
831 runtime->tick_timer.function = snd_pcm_tick_timer_func;
832 runtime->tick_timer.data = (unsigned long) substream;
833
834 runtime->status->state = SNDRV_PCM_STATE_OPEN;
835
836 substream->runtime = runtime;
837 substream->private_data = pcm->private_data;
838 pstr->substream_opened++;
839 *rsubstream = substream;
840 return 0;
841}
842
877211f5 843void snd_pcm_release_substream(struct snd_pcm_substream *substream)
1da177e4 844{
877211f5 845 struct snd_pcm_runtime *runtime;
1da177e4
LT		 846 substream->file = NULL;
847 runtime = substream->runtime;
848 snd_assert(runtime != NULL, return);
849 if (runtime->private_free != NULL)
850 runtime->private_free(runtime);
877211f5
TI		 851 snd_free_pages((void*)runtime->status,
852 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
853 snd_free_pages((void*)runtime->control,
854 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
1da177e4
LT		 855 kfree(runtime->hw_constraints.rules);
856 kfree(runtime);
857 substream->runtime = NULL;
858 substream->pstr->substream_opened--;
859}
860
877211f5 861static int snd_pcm_dev_register(struct snd_device *device)
1da177e4
LT		 862{
863 int idx, cidx, err;
864 unsigned short minor;
877211f5 865 struct snd_pcm_substream *substream;
1da177e4
LT		 866 struct list_head *list;
867 char str[16];
877211f5 868 struct snd_pcm *pcm = device->device_data;
1da177e4
LT		 869
870 snd_assert(pcm != NULL && device != NULL, return -ENXIO);
871 down(&register_mutex);
872 idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
873 if (snd_pcm_devices[idx]) {
874 up(&register_mutex);
875 return -EBUSY;
876 }
877 snd_pcm_devices[idx] = pcm;
878 for (cidx = 0; cidx < 2; cidx++) {
879 int devtype = -1;
880 if (pcm->streams[cidx].substream == NULL)
881 continue;
882 switch (cidx) {
883 case SNDRV_PCM_STREAM_PLAYBACK:
884 sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
885 minor = SNDRV_MINOR_PCM_PLAYBACK + idx;
886 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
887 break;
888 case SNDRV_PCM_STREAM_CAPTURE:
889 sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
890 minor = SNDRV_MINOR_PCM_CAPTURE + idx;
891 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
892 break;
893 }
894 if ((err = snd_register_device(devtype, pcm->card, pcm->device, pcm->streams[cidx].reg, str)) < 0) {
895 snd_pcm_devices[idx] = NULL;
896 up(&register_mutex);
897 return err;
898 }
899 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
900 snd_pcm_timer_init(substream);
901 }
902 list_for_each(list, &snd_pcm_notify_list) {
877211f5
TI		 903 struct snd_pcm_notify *notify;
904 notify = list_entry(list, struct snd_pcm_notify, list);
1da177e4
LT		 905 notify->n_register(pcm);
906 }
907 up(&register_mutex);
908 return 0;
909}
910
877211f5 911static int snd_pcm_dev_disconnect(struct snd_device *device)
1da177e4 912{
877211f5 913 struct snd_pcm *pcm = device->device_data;
1da177e4 914 struct list_head *list;
877211f5 915 struct snd_pcm_substream *substream;
1da177e4
LT		 916 int idx, cidx;
917
918 down(&register_mutex);
919 idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
920 snd_pcm_devices[idx] = NULL;
921 for (cidx = 0; cidx < 2; cidx++)
922 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
923 if (substream->runtime)
924 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
925 list_for_each(list, &snd_pcm_notify_list) {
877211f5
TI		 926 struct snd_pcm_notify *notify;
927 notify = list_entry(list, struct snd_pcm_notify, list);
1da177e4
LT		 928 notify->n_disconnect(pcm);
929 }
930 up(&register_mutex);
931 return 0;
932}
933
877211f5 934static int snd_pcm_dev_unregister(struct snd_device *device)
1da177e4
LT		 935{
936 int idx, cidx, devtype;
877211f5 937 struct snd_pcm_substream *substream;
1da177e4 938 struct list_head *list;
877211f5 939 struct snd_pcm *pcm = device->device_data;
1da177e4
LT		 940
941 snd_assert(pcm != NULL, return -ENXIO);
942 down(&register_mutex);
943 idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
944 snd_pcm_devices[idx] = NULL;
945 for (cidx = 0; cidx < 2; cidx++) {
946 devtype = -1;
947 switch (cidx) {
948 case SNDRV_PCM_STREAM_PLAYBACK:
949 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
950 break;
951 case SNDRV_PCM_STREAM_CAPTURE:
952 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
953 break;
954 }
955 snd_unregister_device(devtype, pcm->card, pcm->device);
956 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
957 snd_pcm_timer_done(substream);
958 }
959 list_for_each(list, &snd_pcm_notify_list) {
877211f5
TI		 960 struct snd_pcm_notify *notify;
961 notify = list_entry(list, struct snd_pcm_notify, list);
1da177e4
LT		 962 notify->n_unregister(pcm);
963 }
964 up(&register_mutex);
965 return snd_pcm_free(pcm);
966}
967
877211f5 968int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1da177e4
LT		 969{
970 int idx;
971
972 snd_assert(notify != NULL && notify->n_register != NULL && notify->n_unregister != NULL, return -EINVAL);
973 down(&register_mutex);
974 if (nfree) {
975 list_del(&notify->list);
976 for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
977 if (snd_pcm_devices[idx] == NULL)
978 continue;
979 notify->n_unregister(snd_pcm_devices[idx]);
980 }
981 } else {
982 list_add_tail(&notify->list, &snd_pcm_notify_list);
983 for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
984 if (snd_pcm_devices[idx] == NULL)
985 continue;
986 notify->n_register(snd_pcm_devices[idx]);
987 }
988 }
989 up(&register_mutex);
990 return 0;
991}
992
993/*
994 * Info interface
995 */
996
877211f5
TI		 997static void snd_pcm_proc_read(struct snd_info_entry *entry,
998 struct snd_info_buffer *buffer)
1da177e4
LT		 999{
1000 int idx;
877211f5 1001 struct snd_pcm *pcm;
1da177e4
LT		 1002
1003 down(&register_mutex);
1004 for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
1005 pcm = snd_pcm_devices[idx];
1006 if (pcm == NULL)
1007 continue;
1008 snd_iprintf(buffer, "%02i-%02i: %s : %s", idx / SNDRV_PCM_DEVICES,
1009 idx % SNDRV_PCM_DEVICES, pcm->id, pcm->name);
1010 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
877211f5
TI		 1011 snd_iprintf(buffer, " : playback %i",
1012 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1da177e4 1013 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
877211f5
TI		 1014 snd_iprintf(buffer, " : capture %i",
1015 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1da177e4
LT		 1016 snd_iprintf(buffer, "\n");
1017 }
1018 up(&register_mutex);
1019}
1020
1021/*
1022 * ENTRY functions
1023 */
1024
877211f5 1025static struct snd_info_entry *snd_pcm_proc_entry = NULL;
1da177e4
LT		 1026
1027static int __init alsa_pcm_init(void)
1028{
877211f5 1029 struct snd_info_entry *entry;
1da177e4
LT		 1030
1031 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1032 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1033 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
877211f5
TI		 1034 snd_info_set_text_ops(entry, NULL, SNDRV_CARDS * SNDRV_PCM_DEVICES * 128,
1035 snd_pcm_proc_read);
1da177e4
LT		 1036 if (snd_info_register(entry) < 0) {
1037 snd_info_free_entry(entry);
1038 entry = NULL;
1039 }
1040 }
1041 snd_pcm_proc_entry = entry;
1042 return 0;
1043}
1044
1045static void __exit alsa_pcm_exit(void)
1046{
1047 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1048 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1049 if (snd_pcm_proc_entry) {
1050 snd_info_unregister(snd_pcm_proc_entry);
1051 snd_pcm_proc_entry = NULL;
1052 }
1053}
1054
1055module_init(alsa_pcm_init)
1056module_exit(alsa_pcm_exit)
1057
1058EXPORT_SYMBOL(snd_pcm_devices);
1059EXPORT_SYMBOL(snd_pcm_new);
1060EXPORT_SYMBOL(snd_pcm_new_stream);
1061EXPORT_SYMBOL(snd_pcm_notify);
1062EXPORT_SYMBOL(snd_pcm_open_substream);
1063EXPORT_SYMBOL(snd_pcm_release_substream);
1064EXPORT_SYMBOL(snd_pcm_format_name);
1065 /* pcm_native.c */
1066EXPORT_SYMBOL(snd_pcm_link_rwlock);
1da177e4
LT		 1067#ifdef CONFIG_PM
1068EXPORT_SYMBOL(snd_pcm_suspend);
1069EXPORT_SYMBOL(snd_pcm_suspend_all);
1070#endif
1071EXPORT_SYMBOL(snd_pcm_kernel_playback_ioctl);
1072EXPORT_SYMBOL(snd_pcm_kernel_capture_ioctl);
1073EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
1074EXPORT_SYMBOL(snd_pcm_mmap_data);
1075#if SNDRV_PCM_INFO_MMAP_IOMEM
1076EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
1077#endif
1078 /* pcm_misc.c */
1079EXPORT_SYMBOL(snd_pcm_format_signed);
1080EXPORT_SYMBOL(snd_pcm_format_unsigned);
1081EXPORT_SYMBOL(snd_pcm_format_linear);
1082EXPORT_SYMBOL(snd_pcm_format_little_endian);
1083EXPORT_SYMBOL(snd_pcm_format_big_endian);
1084EXPORT_SYMBOL(snd_pcm_format_width);
1085EXPORT_SYMBOL(snd_pcm_format_physical_width);
9502dcad 1086EXPORT_SYMBOL(snd_pcm_format_size);
1da177e4
LT		 1087EXPORT_SYMBOL(snd_pcm_format_silence_64);
1088EXPORT_SYMBOL(snd_pcm_format_set_silence);
1089EXPORT_SYMBOL(snd_pcm_build_linear_format);
1090EXPORT_SYMBOL(snd_pcm_limit_hw_rates);
Linux kernel - Deliverables
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