vmap: flush vmap aliases when mapping fails
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / sound / core / pcm.c
blob6b4b1287b314455111c5853334a4aded9425edd3
1 /*
2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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.
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.
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
22 #include <linux/init.h>
23 #include <linux/slab.h>
24 #include <linux/time.h>
25 #include <linux/mutex.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>
32 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
33 MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
34 MODULE_LICENSE("GPL");
36 static LIST_HEAD(snd_pcm_devices);
37 static LIST_HEAD(snd_pcm_notify_list);
38 static DEFINE_MUTEX(register_mutex);
40 static int snd_pcm_free(struct snd_pcm *pcm);
41 static int snd_pcm_dev_free(struct snd_device *device);
42 static int snd_pcm_dev_register(struct snd_device *device);
43 static int snd_pcm_dev_disconnect(struct snd_device *device);
45 static struct snd_pcm *snd_pcm_get(struct snd_card *card, int device)
47 struct snd_pcm *pcm;
49 list_for_each_entry(pcm, &snd_pcm_devices, list) {
50 if (pcm->card == card && pcm->device == device)
51 return pcm;
53 return NULL;
56 static int snd_pcm_next(struct snd_card *card, int device)
58 struct snd_pcm *pcm;
60 list_for_each_entry(pcm, &snd_pcm_devices, list) {
61 if (pcm->card == card && pcm->device > device)
62 return pcm->device;
63 else if (pcm->card->number > card->number)
64 return -1;
66 return -1;
69 static int snd_pcm_add(struct snd_pcm *newpcm)
71 struct snd_pcm *pcm;
73 list_for_each_entry(pcm, &snd_pcm_devices, list) {
74 if (pcm->card == newpcm->card && pcm->device == newpcm->device)
75 return -EBUSY;
76 if (pcm->card->number > newpcm->card->number ||
77 (pcm->card == newpcm->card &&
78 pcm->device > newpcm->device)) {
79 list_add(&newpcm->list, pcm->list.prev);
80 return 0;
83 list_add_tail(&newpcm->list, &snd_pcm_devices);
84 return 0;
87 static int snd_pcm_control_ioctl(struct snd_card *card,
88 struct snd_ctl_file *control,
89 unsigned int cmd, unsigned long arg)
91 switch (cmd) {
92 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
94 int device;
96 if (get_user(device, (int __user *)arg))
97 return -EFAULT;
98 mutex_lock(&register_mutex);
99 device = snd_pcm_next(card, device);
100 mutex_unlock(&register_mutex);
101 if (put_user(device, (int __user *)arg))
102 return -EFAULT;
103 return 0;
105 case SNDRV_CTL_IOCTL_PCM_INFO:
107 struct snd_pcm_info __user *info;
108 unsigned int device, subdevice;
109 int stream;
110 struct snd_pcm *pcm;
111 struct snd_pcm_str *pstr;
112 struct snd_pcm_substream *substream;
113 int err;
115 info = (struct snd_pcm_info __user *)arg;
116 if (get_user(device, &info->device))
117 return -EFAULT;
118 if (get_user(stream, &info->stream))
119 return -EFAULT;
120 if (stream < 0 || stream > 1)
121 return -EINVAL;
122 if (get_user(subdevice, &info->subdevice))
123 return -EFAULT;
124 mutex_lock(&register_mutex);
125 pcm = snd_pcm_get(card, device);
126 if (pcm == NULL) {
127 err = -ENXIO;
128 goto _error;
130 pstr = &pcm->streams[stream];
131 if (pstr->substream_count == 0) {
132 err = -ENOENT;
133 goto _error;
135 if (subdevice >= pstr->substream_count) {
136 err = -ENXIO;
137 goto _error;
139 for (substream = pstr->substream; substream;
140 substream = substream->next)
141 if (substream->number == (int)subdevice)
142 break;
143 if (substream == NULL) {
144 err = -ENXIO;
145 goto _error;
147 err = snd_pcm_info_user(substream, info);
148 _error:
149 mutex_unlock(&register_mutex);
150 return err;
152 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
154 int val;
156 if (get_user(val, (int __user *)arg))
157 return -EFAULT;
158 control->prefer_pcm_subdevice = val;
159 return 0;
162 return -ENOIOCTLCMD;
165 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
167 static char *snd_pcm_format_names[] = {
168 FORMAT(S8),
169 FORMAT(U8),
170 FORMAT(S16_LE),
171 FORMAT(S16_BE),
172 FORMAT(U16_LE),
173 FORMAT(U16_BE),
174 FORMAT(S24_LE),
175 FORMAT(S24_BE),
176 FORMAT(U24_LE),
177 FORMAT(U24_BE),
178 FORMAT(S32_LE),
179 FORMAT(S32_BE),
180 FORMAT(U32_LE),
181 FORMAT(U32_BE),
182 FORMAT(FLOAT_LE),
183 FORMAT(FLOAT_BE),
184 FORMAT(FLOAT64_LE),
185 FORMAT(FLOAT64_BE),
186 FORMAT(IEC958_SUBFRAME_LE),
187 FORMAT(IEC958_SUBFRAME_BE),
188 FORMAT(MU_LAW),
189 FORMAT(A_LAW),
190 FORMAT(IMA_ADPCM),
191 FORMAT(MPEG),
192 FORMAT(GSM),
193 FORMAT(SPECIAL),
194 FORMAT(S24_3LE),
195 FORMAT(S24_3BE),
196 FORMAT(U24_3LE),
197 FORMAT(U24_3BE),
198 FORMAT(S20_3LE),
199 FORMAT(S20_3BE),
200 FORMAT(U20_3LE),
201 FORMAT(U20_3BE),
202 FORMAT(S18_3LE),
203 FORMAT(S18_3BE),
204 FORMAT(U18_3LE),
205 FORMAT(U18_3BE),
206 FORMAT(G723_24),
207 FORMAT(G723_24_1B),
208 FORMAT(G723_40),
209 FORMAT(G723_40_1B),
212 const char *snd_pcm_format_name(snd_pcm_format_t format)
214 if (format >= ARRAY_SIZE(snd_pcm_format_names))
215 return "Unknown";
216 return snd_pcm_format_names[format];
218 EXPORT_SYMBOL_GPL(snd_pcm_format_name);
220 #ifdef CONFIG_SND_VERBOSE_PROCFS
222 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
223 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
224 #define READY(v) [SNDRV_PCM_READY_##v] = #v
225 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
226 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
227 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
228 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
229 #define START(v) [SNDRV_PCM_START_##v] = #v
230 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
232 static char *snd_pcm_stream_names[] = {
233 STREAM(PLAYBACK),
234 STREAM(CAPTURE),
237 static char *snd_pcm_state_names[] = {
238 STATE(OPEN),
239 STATE(SETUP),
240 STATE(PREPARED),
241 STATE(RUNNING),
242 STATE(XRUN),
243 STATE(DRAINING),
244 STATE(PAUSED),
245 STATE(SUSPENDED),
248 static char *snd_pcm_access_names[] = {
249 ACCESS(MMAP_INTERLEAVED),
250 ACCESS(MMAP_NONINTERLEAVED),
251 ACCESS(MMAP_COMPLEX),
252 ACCESS(RW_INTERLEAVED),
253 ACCESS(RW_NONINTERLEAVED),
256 static char *snd_pcm_subformat_names[] = {
257 SUBFORMAT(STD),
260 static char *snd_pcm_tstamp_mode_names[] = {
261 TSTAMP(NONE),
262 TSTAMP(ENABLE),
265 static const char *snd_pcm_stream_name(int stream)
267 return snd_pcm_stream_names[stream];
270 static const char *snd_pcm_access_name(snd_pcm_access_t access)
272 return snd_pcm_access_names[access];
275 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
277 return snd_pcm_subformat_names[subformat];
280 static const char *snd_pcm_tstamp_mode_name(int mode)
282 return snd_pcm_tstamp_mode_names[mode];
285 static const char *snd_pcm_state_name(snd_pcm_state_t state)
287 return snd_pcm_state_names[state];
290 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
291 #include <linux/soundcard.h>
293 static const char *snd_pcm_oss_format_name(int format)
295 switch (format) {
296 case AFMT_MU_LAW:
297 return "MU_LAW";
298 case AFMT_A_LAW:
299 return "A_LAW";
300 case AFMT_IMA_ADPCM:
301 return "IMA_ADPCM";
302 case AFMT_U8:
303 return "U8";
304 case AFMT_S16_LE:
305 return "S16_LE";
306 case AFMT_S16_BE:
307 return "S16_BE";
308 case AFMT_S8:
309 return "S8";
310 case AFMT_U16_LE:
311 return "U16_LE";
312 case AFMT_U16_BE:
313 return "U16_BE";
314 case AFMT_MPEG:
315 return "MPEG";
316 default:
317 return "unknown";
320 #endif
322 static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
323 struct snd_info_buffer *buffer)
325 struct snd_pcm_info *info;
326 int err;
328 if (! substream)
329 return;
331 info = kmalloc(sizeof(*info), GFP_KERNEL);
332 if (! info) {
333 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
334 return;
337 err = snd_pcm_info(substream, info);
338 if (err < 0) {
339 snd_iprintf(buffer, "error %d\n", err);
340 kfree(info);
341 return;
343 snd_iprintf(buffer, "card: %d\n", info->card);
344 snd_iprintf(buffer, "device: %d\n", info->device);
345 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
346 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
347 snd_iprintf(buffer, "id: %s\n", info->id);
348 snd_iprintf(buffer, "name: %s\n", info->name);
349 snd_iprintf(buffer, "subname: %s\n", info->subname);
350 snd_iprintf(buffer, "class: %d\n", info->dev_class);
351 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
352 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
353 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
354 kfree(info);
357 static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
358 struct snd_info_buffer *buffer)
360 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
361 buffer);
364 static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
365 struct snd_info_buffer *buffer)
367 snd_pcm_proc_info_read(entry->private_data, buffer);
370 static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
371 struct snd_info_buffer *buffer)
373 struct snd_pcm_substream *substream = entry->private_data;
374 struct snd_pcm_runtime *runtime;
376 mutex_lock(&substream->pcm->open_mutex);
377 runtime = substream->runtime;
378 if (!runtime) {
379 snd_iprintf(buffer, "closed\n");
380 goto unlock;
382 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
383 snd_iprintf(buffer, "no setup\n");
384 goto unlock;
386 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
387 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
388 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
389 snd_iprintf(buffer, "channels: %u\n", runtime->channels);
390 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
391 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
392 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
393 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
394 if (substream->oss.oss) {
395 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
396 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
397 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
398 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
399 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
400 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
402 #endif
403 unlock:
404 mutex_unlock(&substream->pcm->open_mutex);
407 static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
408 struct snd_info_buffer *buffer)
410 struct snd_pcm_substream *substream = entry->private_data;
411 struct snd_pcm_runtime *runtime;
413 mutex_lock(&substream->pcm->open_mutex);
414 runtime = substream->runtime;
415 if (!runtime) {
416 snd_iprintf(buffer, "closed\n");
417 goto unlock;
419 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
420 snd_iprintf(buffer, "no setup\n");
421 goto unlock;
423 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
424 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
425 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
426 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
427 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
428 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
429 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
430 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
431 unlock:
432 mutex_unlock(&substream->pcm->open_mutex);
435 static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
436 struct snd_info_buffer *buffer)
438 struct snd_pcm_substream *substream = entry->private_data;
439 struct snd_pcm_runtime *runtime;
440 struct snd_pcm_status status;
441 int err;
443 mutex_lock(&substream->pcm->open_mutex);
444 runtime = substream->runtime;
445 if (!runtime) {
446 snd_iprintf(buffer, "closed\n");
447 goto unlock;
449 memset(&status, 0, sizeof(status));
450 err = snd_pcm_status(substream, &status);
451 if (err < 0) {
452 snd_iprintf(buffer, "error %d\n", err);
453 goto unlock;
455 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
456 snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid));
457 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
458 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
459 snd_iprintf(buffer, "tstamp : %ld.%09ld\n",
460 status.tstamp.tv_sec, status.tstamp.tv_nsec);
461 snd_iprintf(buffer, "delay : %ld\n", status.delay);
462 snd_iprintf(buffer, "avail : %ld\n", status.avail);
463 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
464 snd_iprintf(buffer, "-----\n");
465 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
466 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
467 unlock:
468 mutex_unlock(&substream->pcm->open_mutex);
471 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
472 static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
473 struct snd_info_buffer *buffer)
475 struct snd_pcm_str *pstr = entry->private_data;
476 snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
479 static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
480 struct snd_info_buffer *buffer)
482 struct snd_pcm_str *pstr = entry->private_data;
483 char line[64];
484 if (!snd_info_get_line(buffer, line, sizeof(line)))
485 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
487 #endif
489 static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
491 struct snd_pcm *pcm = pstr->pcm;
492 struct snd_info_entry *entry;
493 char name[16];
495 sprintf(name, "pcm%i%c", pcm->device,
496 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
497 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
498 return -ENOMEM;
499 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
500 if (snd_info_register(entry) < 0) {
501 snd_info_free_entry(entry);
502 return -ENOMEM;
504 pstr->proc_root = entry;
506 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
507 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
508 if (snd_info_register(entry) < 0) {
509 snd_info_free_entry(entry);
510 entry = NULL;
513 pstr->proc_info_entry = entry;
515 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
516 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
517 pstr->proc_root)) != NULL) {
518 entry->c.text.read = snd_pcm_xrun_debug_read;
519 entry->c.text.write = snd_pcm_xrun_debug_write;
520 entry->mode |= S_IWUSR;
521 entry->private_data = pstr;
522 if (snd_info_register(entry) < 0) {
523 snd_info_free_entry(entry);
524 entry = NULL;
527 pstr->proc_xrun_debug_entry = entry;
528 #endif
529 return 0;
532 static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
534 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
535 snd_info_free_entry(pstr->proc_xrun_debug_entry);
536 pstr->proc_xrun_debug_entry = NULL;
537 #endif
538 snd_info_free_entry(pstr->proc_info_entry);
539 pstr->proc_info_entry = NULL;
540 snd_info_free_entry(pstr->proc_root);
541 pstr->proc_root = NULL;
542 return 0;
545 static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
547 struct snd_info_entry *entry;
548 struct snd_card *card;
549 char name[16];
551 card = substream->pcm->card;
553 sprintf(name, "sub%i", substream->number);
554 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
555 return -ENOMEM;
556 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
557 if (snd_info_register(entry) < 0) {
558 snd_info_free_entry(entry);
559 return -ENOMEM;
561 substream->proc_root = entry;
563 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
564 snd_info_set_text_ops(entry, substream,
565 snd_pcm_substream_proc_info_read);
566 if (snd_info_register(entry) < 0) {
567 snd_info_free_entry(entry);
568 entry = NULL;
571 substream->proc_info_entry = entry;
573 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
574 snd_info_set_text_ops(entry, substream,
575 snd_pcm_substream_proc_hw_params_read);
576 if (snd_info_register(entry) < 0) {
577 snd_info_free_entry(entry);
578 entry = NULL;
581 substream->proc_hw_params_entry = entry;
583 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
584 snd_info_set_text_ops(entry, substream,
585 snd_pcm_substream_proc_sw_params_read);
586 if (snd_info_register(entry) < 0) {
587 snd_info_free_entry(entry);
588 entry = NULL;
591 substream->proc_sw_params_entry = entry;
593 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
594 snd_info_set_text_ops(entry, substream,
595 snd_pcm_substream_proc_status_read);
596 if (snd_info_register(entry) < 0) {
597 snd_info_free_entry(entry);
598 entry = NULL;
601 substream->proc_status_entry = entry;
603 return 0;
606 static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
608 snd_info_free_entry(substream->proc_info_entry);
609 substream->proc_info_entry = NULL;
610 snd_info_free_entry(substream->proc_hw_params_entry);
611 substream->proc_hw_params_entry = NULL;
612 snd_info_free_entry(substream->proc_sw_params_entry);
613 substream->proc_sw_params_entry = NULL;
614 snd_info_free_entry(substream->proc_status_entry);
615 substream->proc_status_entry = NULL;
616 snd_info_free_entry(substream->proc_root);
617 substream->proc_root = NULL;
618 return 0;
620 #else /* !CONFIG_SND_VERBOSE_PROCFS */
621 static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
622 static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
623 static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
624 static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
625 #endif /* CONFIG_SND_VERBOSE_PROCFS */
628 * snd_pcm_new_stream - create a new PCM stream
629 * @pcm: the pcm instance
630 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
631 * @substream_count: the number of substreams
633 * Creates a new stream for the pcm.
634 * The corresponding stream on the pcm must have been empty before
635 * calling this, i.e. zero must be given to the argument of
636 * snd_pcm_new().
638 * Returns zero if successful, or a negative error code on failure.
640 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
642 int idx, err;
643 struct snd_pcm_str *pstr = &pcm->streams[stream];
644 struct snd_pcm_substream *substream, *prev;
646 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
647 mutex_init(&pstr->oss.setup_mutex);
648 #endif
649 pstr->stream = stream;
650 pstr->pcm = pcm;
651 pstr->substream_count = substream_count;
652 if (substream_count > 0) {
653 err = snd_pcm_stream_proc_init(pstr);
654 if (err < 0) {
655 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
656 return err;
659 prev = NULL;
660 for (idx = 0, prev = NULL; idx < substream_count; idx++) {
661 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
662 if (substream == NULL) {
663 snd_printk(KERN_ERR "Cannot allocate PCM substream\n");
664 return -ENOMEM;
666 substream->pcm = pcm;
667 substream->pstr = pstr;
668 substream->number = idx;
669 substream->stream = stream;
670 sprintf(substream->name, "subdevice #%i", idx);
671 substream->buffer_bytes_max = UINT_MAX;
672 if (prev == NULL)
673 pstr->substream = substream;
674 else
675 prev->next = substream;
676 err = snd_pcm_substream_proc_init(substream);
677 if (err < 0) {
678 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
679 if (prev == NULL)
680 pstr->substream = NULL;
681 else
682 prev->next = NULL;
683 kfree(substream);
684 return err;
686 substream->group = &substream->self_group;
687 spin_lock_init(&substream->self_group.lock);
688 INIT_LIST_HEAD(&substream->self_group.substreams);
689 list_add_tail(&substream->link_list, &substream->self_group.substreams);
690 atomic_set(&substream->mmap_count, 0);
691 prev = substream;
693 return 0;
696 EXPORT_SYMBOL(snd_pcm_new_stream);
699 * snd_pcm_new - create a new PCM instance
700 * @card: the card instance
701 * @id: the id string
702 * @device: the device index (zero based)
703 * @playback_count: the number of substreams for playback
704 * @capture_count: the number of substreams for capture
705 * @rpcm: the pointer to store the new pcm instance
707 * Creates a new PCM instance.
709 * The pcm operators have to be set afterwards to the new instance
710 * via snd_pcm_set_ops().
712 * Returns zero if successful, or a negative error code on failure.
714 int snd_pcm_new(struct snd_card *card, const char *id, int device,
715 int playback_count, int capture_count,
716 struct snd_pcm ** rpcm)
718 struct snd_pcm *pcm;
719 int err;
720 static struct snd_device_ops ops = {
721 .dev_free = snd_pcm_dev_free,
722 .dev_register = snd_pcm_dev_register,
723 .dev_disconnect = snd_pcm_dev_disconnect,
726 if (snd_BUG_ON(!card))
727 return -ENXIO;
728 if (rpcm)
729 *rpcm = NULL;
730 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
731 if (pcm == NULL) {
732 snd_printk(KERN_ERR "Cannot allocate PCM\n");
733 return -ENOMEM;
735 pcm->card = card;
736 pcm->device = device;
737 if (id)
738 strlcpy(pcm->id, id, sizeof(pcm->id));
739 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
740 snd_pcm_free(pcm);
741 return err;
743 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
744 snd_pcm_free(pcm);
745 return err;
747 mutex_init(&pcm->open_mutex);
748 init_waitqueue_head(&pcm->open_wait);
749 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
750 snd_pcm_free(pcm);
751 return err;
753 if (rpcm)
754 *rpcm = pcm;
755 return 0;
758 EXPORT_SYMBOL(snd_pcm_new);
760 static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
762 struct snd_pcm_substream *substream, *substream_next;
763 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
764 struct snd_pcm_oss_setup *setup, *setupn;
765 #endif
766 substream = pstr->substream;
767 while (substream) {
768 substream_next = substream->next;
769 snd_pcm_timer_done(substream);
770 snd_pcm_substream_proc_done(substream);
771 kfree(substream);
772 substream = substream_next;
774 snd_pcm_stream_proc_done(pstr);
775 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
776 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
777 setupn = setup->next;
778 kfree(setup->task_name);
779 kfree(setup);
781 #endif
784 static int snd_pcm_free(struct snd_pcm *pcm)
786 struct snd_pcm_notify *notify;
788 if (!pcm)
789 return 0;
790 list_for_each_entry(notify, &snd_pcm_notify_list, list) {
791 notify->n_unregister(pcm);
793 if (pcm->private_free)
794 pcm->private_free(pcm);
795 snd_pcm_lib_preallocate_free_for_all(pcm);
796 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
797 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
798 kfree(pcm);
799 return 0;
802 static int snd_pcm_dev_free(struct snd_device *device)
804 struct snd_pcm *pcm = device->device_data;
805 return snd_pcm_free(pcm);
808 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
809 struct file *file,
810 struct snd_pcm_substream **rsubstream)
812 struct snd_pcm_str * pstr;
813 struct snd_pcm_substream *substream;
814 struct snd_pcm_runtime *runtime;
815 struct snd_ctl_file *kctl;
816 struct snd_card *card;
817 int prefer_subdevice = -1;
818 size_t size;
820 if (snd_BUG_ON(!pcm || !rsubstream))
821 return -ENXIO;
822 *rsubstream = NULL;
823 pstr = &pcm->streams[stream];
824 if (pstr->substream == NULL || pstr->substream_count == 0)
825 return -ENODEV;
827 card = pcm->card;
828 read_lock(&card->ctl_files_rwlock);
829 list_for_each_entry(kctl, &card->ctl_files, list) {
830 if (kctl->pid == task_pid(current)) {
831 prefer_subdevice = kctl->prefer_pcm_subdevice;
832 if (prefer_subdevice != -1)
833 break;
836 read_unlock(&card->ctl_files_rwlock);
838 switch (stream) {
839 case SNDRV_PCM_STREAM_PLAYBACK:
840 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
841 for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
842 if (SUBSTREAM_BUSY(substream))
843 return -EAGAIN;
846 break;
847 case SNDRV_PCM_STREAM_CAPTURE:
848 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
849 for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
850 if (SUBSTREAM_BUSY(substream))
851 return -EAGAIN;
854 break;
855 default:
856 return -EINVAL;
859 if (file->f_flags & O_APPEND) {
860 if (prefer_subdevice < 0) {
861 if (pstr->substream_count > 1)
862 return -EINVAL; /* must be unique */
863 substream = pstr->substream;
864 } else {
865 for (substream = pstr->substream; substream;
866 substream = substream->next)
867 if (substream->number == prefer_subdevice)
868 break;
870 if (! substream)
871 return -ENODEV;
872 if (! SUBSTREAM_BUSY(substream))
873 return -EBADFD;
874 substream->ref_count++;
875 *rsubstream = substream;
876 return 0;
879 if (prefer_subdevice >= 0) {
880 for (substream = pstr->substream; substream; substream = substream->next)
881 if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
882 goto __ok;
884 for (substream = pstr->substream; substream; substream = substream->next)
885 if (!SUBSTREAM_BUSY(substream))
886 break;
887 __ok:
888 if (substream == NULL)
889 return -EAGAIN;
891 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
892 if (runtime == NULL)
893 return -ENOMEM;
895 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
896 runtime->status = snd_malloc_pages(size, GFP_KERNEL);
897 if (runtime->status == NULL) {
898 kfree(runtime);
899 return -ENOMEM;
901 memset((void*)runtime->status, 0, size);
903 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
904 runtime->control = snd_malloc_pages(size, GFP_KERNEL);
905 if (runtime->control == NULL) {
906 snd_free_pages((void*)runtime->status,
907 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
908 kfree(runtime);
909 return -ENOMEM;
911 memset((void*)runtime->control, 0, size);
913 init_waitqueue_head(&runtime->sleep);
914 init_waitqueue_head(&runtime->tsleep);
916 runtime->status->state = SNDRV_PCM_STATE_OPEN;
918 substream->runtime = runtime;
919 substream->private_data = pcm->private_data;
920 substream->ref_count = 1;
921 substream->f_flags = file->f_flags;
922 substream->pid = get_pid(task_pid(current));
923 pstr->substream_opened++;
924 *rsubstream = substream;
925 return 0;
928 void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
930 struct snd_pcm_runtime *runtime;
932 if (PCM_RUNTIME_CHECK(substream))
933 return;
934 runtime = substream->runtime;
935 if (runtime->private_free != NULL)
936 runtime->private_free(runtime);
937 snd_free_pages((void*)runtime->status,
938 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
939 snd_free_pages((void*)runtime->control,
940 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
941 kfree(runtime->hw_constraints.rules);
942 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
943 if (runtime->hwptr_log)
944 kfree(runtime->hwptr_log);
945 #endif
946 kfree(runtime);
947 substream->runtime = NULL;
948 put_pid(substream->pid);
949 substream->pid = NULL;
950 substream->pstr->substream_opened--;
953 static ssize_t show_pcm_class(struct device *dev,
954 struct device_attribute *attr, char *buf)
956 struct snd_pcm *pcm;
957 const char *str;
958 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
959 [SNDRV_PCM_CLASS_GENERIC] = "generic",
960 [SNDRV_PCM_CLASS_MULTI] = "multi",
961 [SNDRV_PCM_CLASS_MODEM] = "modem",
962 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
965 if (! (pcm = dev_get_drvdata(dev)) ||
966 pcm->dev_class > SNDRV_PCM_CLASS_LAST)
967 str = "none";
968 else
969 str = strs[pcm->dev_class];
970 return snprintf(buf, PAGE_SIZE, "%s\n", str);
973 static struct device_attribute pcm_attrs =
974 __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
976 static int snd_pcm_dev_register(struct snd_device *device)
978 int cidx, err;
979 struct snd_pcm_substream *substream;
980 struct snd_pcm_notify *notify;
981 char str[16];
982 struct snd_pcm *pcm;
983 struct device *dev;
985 if (snd_BUG_ON(!device || !device->device_data))
986 return -ENXIO;
987 pcm = device->device_data;
988 mutex_lock(&register_mutex);
989 err = snd_pcm_add(pcm);
990 if (err) {
991 mutex_unlock(&register_mutex);
992 return err;
994 for (cidx = 0; cidx < 2; cidx++) {
995 int devtype = -1;
996 if (pcm->streams[cidx].substream == NULL)
997 continue;
998 switch (cidx) {
999 case SNDRV_PCM_STREAM_PLAYBACK:
1000 sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
1001 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1002 break;
1003 case SNDRV_PCM_STREAM_CAPTURE:
1004 sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
1005 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1006 break;
1008 /* device pointer to use, pcm->dev takes precedence if
1009 * it is assigned, otherwise fall back to card's device
1010 * if possible */
1011 dev = pcm->dev;
1012 if (!dev)
1013 dev = snd_card_get_device_link(pcm->card);
1014 /* register pcm */
1015 err = snd_register_device_for_dev(devtype, pcm->card,
1016 pcm->device,
1017 &snd_pcm_f_ops[cidx],
1018 pcm, str, dev);
1019 if (err < 0) {
1020 list_del(&pcm->list);
1021 mutex_unlock(&register_mutex);
1022 return err;
1024 snd_add_device_sysfs_file(devtype, pcm->card, pcm->device,
1025 &pcm_attrs);
1026 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1027 snd_pcm_timer_init(substream);
1030 list_for_each_entry(notify, &snd_pcm_notify_list, list)
1031 notify->n_register(pcm);
1033 mutex_unlock(&register_mutex);
1034 return 0;
1037 static int snd_pcm_dev_disconnect(struct snd_device *device)
1039 struct snd_pcm *pcm = device->device_data;
1040 struct snd_pcm_notify *notify;
1041 struct snd_pcm_substream *substream;
1042 int cidx, devtype;
1044 mutex_lock(&register_mutex);
1045 if (list_empty(&pcm->list))
1046 goto unlock;
1048 list_del_init(&pcm->list);
1049 for (cidx = 0; cidx < 2; cidx++)
1050 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1051 if (substream->runtime)
1052 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
1053 list_for_each_entry(notify, &snd_pcm_notify_list, list) {
1054 notify->n_disconnect(pcm);
1056 for (cidx = 0; cidx < 2; cidx++) {
1057 devtype = -1;
1058 switch (cidx) {
1059 case SNDRV_PCM_STREAM_PLAYBACK:
1060 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1061 break;
1062 case SNDRV_PCM_STREAM_CAPTURE:
1063 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1064 break;
1066 snd_unregister_device(devtype, pcm->card, pcm->device);
1068 unlock:
1069 mutex_unlock(&register_mutex);
1070 return 0;
1073 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
1075 struct snd_pcm *pcm;
1077 if (snd_BUG_ON(!notify ||
1078 !notify->n_register ||
1079 !notify->n_unregister ||
1080 !notify->n_disconnect))
1081 return -EINVAL;
1082 mutex_lock(&register_mutex);
1083 if (nfree) {
1084 list_del(&notify->list);
1085 list_for_each_entry(pcm, &snd_pcm_devices, list)
1086 notify->n_unregister(pcm);
1087 } else {
1088 list_add_tail(&notify->list, &snd_pcm_notify_list);
1089 list_for_each_entry(pcm, &snd_pcm_devices, list)
1090 notify->n_register(pcm);
1092 mutex_unlock(&register_mutex);
1093 return 0;
1096 EXPORT_SYMBOL(snd_pcm_notify);
1098 #ifdef CONFIG_PROC_FS
1100 * Info interface
1103 static void snd_pcm_proc_read(struct snd_info_entry *entry,
1104 struct snd_info_buffer *buffer)
1106 struct snd_pcm *pcm;
1108 mutex_lock(&register_mutex);
1109 list_for_each_entry(pcm, &snd_pcm_devices, list) {
1110 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1111 pcm->card->number, pcm->device, pcm->id, pcm->name);
1112 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1113 snd_iprintf(buffer, " : playback %i",
1114 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1115 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1116 snd_iprintf(buffer, " : capture %i",
1117 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1118 snd_iprintf(buffer, "\n");
1120 mutex_unlock(&register_mutex);
1123 static struct snd_info_entry *snd_pcm_proc_entry;
1125 static void snd_pcm_proc_init(void)
1127 struct snd_info_entry *entry;
1129 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1130 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
1131 if (snd_info_register(entry) < 0) {
1132 snd_info_free_entry(entry);
1133 entry = NULL;
1136 snd_pcm_proc_entry = entry;
1139 static void snd_pcm_proc_done(void)
1141 snd_info_free_entry(snd_pcm_proc_entry);
1144 #else /* !CONFIG_PROC_FS */
1145 #define snd_pcm_proc_init()
1146 #define snd_pcm_proc_done()
1147 #endif /* CONFIG_PROC_FS */
1151 * ENTRY functions
1154 static int __init alsa_pcm_init(void)
1156 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1157 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1158 snd_pcm_proc_init();
1159 return 0;
1162 static void __exit alsa_pcm_exit(void)
1164 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1165 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1166 snd_pcm_proc_done();
1169 module_init(alsa_pcm_init)
1170 module_exit(alsa_pcm_exit)