blob: 204af48c5cc17f2f59632bb2089aa03c7b593664 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Digital Audio (PCM) abstract layer
Jaroslav Kyselac1017a42007-10-15 09:50:19 +02003 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/init.h>
23#include <linux/slab.h>
24#include <linux/time.h>
Ingo Molnar1a60d4c2006-01-16 16:29:08 +010025#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#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
Jaroslav Kyselac1017a42007-10-15 09:50:19 +020032MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
Linus Torvalds1da177e2005-04-16 15:20:36 -070033MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
34MODULE_LICENSE("GPL");
35
Clemens Ladischf87135f2005-11-20 14:06:59 +010036static LIST_HEAD(snd_pcm_devices);
Linus Torvalds1da177e2005-04-16 15:20:36 -070037static LIST_HEAD(snd_pcm_notify_list);
Ingo Molnar1a60d4c2006-01-16 16:29:08 +010038static DEFINE_MUTEX(register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
Takashi Iwai877211f2005-11-17 13:59:38 +010040static 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
Pawel MOLLf90c06a2008-07-30 12:46:40 +010045static struct snd_pcm *snd_pcm_get(struct snd_card *card, int device)
Clemens Ladischf87135f2005-11-20 14:06:59 +010046{
Clemens Ladischf87135f2005-11-20 14:06:59 +010047 struct snd_pcm *pcm;
48
Johannes Berg9244b2c2006-10-05 16:02:22 +020049 list_for_each_entry(pcm, &snd_pcm_devices, list) {
Clemens Ladischf87135f2005-11-20 14:06:59 +010050 if (pcm->card == card && pcm->device == device)
51 return pcm;
52 }
53 return NULL;
54}
55
Pawel MOLLf90c06a2008-07-30 12:46:40 +010056static int snd_pcm_next(struct snd_card *card, int device)
57{
58 struct snd_pcm *pcm;
59
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;
65 }
66 return -1;
67}
68
69static int snd_pcm_add(struct snd_pcm *newpcm)
70{
71 struct snd_pcm *pcm;
72
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;
81 }
82 }
83 list_add_tail(&newpcm->list, &snd_pcm_devices);
84 return 0;
85}
86
Takashi Iwai877211f2005-11-17 13:59:38 +010087static int snd_pcm_control_ioctl(struct snd_card *card,
88 struct snd_ctl_file *control,
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 unsigned int cmd, unsigned long arg)
90{
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 switch (cmd) {
92 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
93 {
94 int device;
95
96 if (get_user(device, (int __user *)arg))
97 return -EFAULT;
Ingo Molnar1a60d4c2006-01-16 16:29:08 +010098 mutex_lock(&register_mutex);
Pawel MOLLf90c06a2008-07-30 12:46:40 +010099 device = snd_pcm_next(card, device);
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100100 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 if (put_user(device, (int __user *)arg))
102 return -EFAULT;
103 return 0;
104 }
105 case SNDRV_CTL_IOCTL_PCM_INFO:
106 {
Takashi Iwai877211f2005-11-17 13:59:38 +0100107 struct snd_pcm_info __user *info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 unsigned int device, subdevice;
Takashi Iwai877211f2005-11-17 13:59:38 +0100109 int stream;
110 struct snd_pcm *pcm;
111 struct snd_pcm_str *pstr;
112 struct snd_pcm_substream *substream;
Clemens Ladischf87135f2005-11-20 14:06:59 +0100113 int err;
114
Takashi Iwai877211f2005-11-17 13:59:38 +0100115 info = (struct snd_pcm_info __user *)arg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 if (get_user(device, &info->device))
117 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 if (get_user(stream, &info->stream))
119 return -EFAULT;
120 if (stream < 0 || stream > 1)
121 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 if (get_user(subdevice, &info->subdevice))
123 return -EFAULT;
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100124 mutex_lock(&register_mutex);
Pawel MOLLf90c06a2008-07-30 12:46:40 +0100125 pcm = snd_pcm_get(card, device);
Clemens Ladischf87135f2005-11-20 14:06:59 +0100126 if (pcm == NULL) {
127 err = -ENXIO;
128 goto _error;
129 }
130 pstr = &pcm->streams[stream];
131 if (pstr->substream_count == 0) {
132 err = -ENOENT;
133 goto _error;
134 }
135 if (subdevice >= pstr->substream_count) {
136 err = -ENXIO;
137 goto _error;
138 }
139 for (substream = pstr->substream; substream;
140 substream = substream->next)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 if (substream->number == (int)subdevice)
142 break;
Clemens Ladischf87135f2005-11-20 14:06:59 +0100143 if (substream == NULL) {
144 err = -ENXIO;
145 goto _error;
146 }
147 err = snd_pcm_info_user(substream, info);
148 _error:
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100149 mutex_unlock(&register_mutex);
Clemens Ladischf87135f2005-11-20 14:06:59 +0100150 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 }
152 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
153 {
154 int val;
155
156 if (get_user(val, (int __user *)arg))
157 return -EFAULT;
158 control->prefer_pcm_subdevice = val;
159 return 0;
160 }
161 }
162 return -ENOIOCTLCMD;
163}
Jaroslav Kysela21a34792006-01-13 09:12:11 +0100164
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165#define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167static 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),
Dan Carpenter7a288262010-08-27 22:02:15 +0200206 FORMAT(G723_24),
207 FORMAT(G723_24_1B),
208 FORMAT(G723_40),
209 FORMAT(G723_40_1B),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210};
211
Takashi Iwai6e5265e2009-09-08 14:26:51 +0200212const char *snd_pcm_format_name(snd_pcm_format_t format)
Takashi Iwaie28563c2005-12-01 10:42:42 +0100213{
Dan Carpenter7a288262010-08-27 22:02:15 +0200214 if (format >= ARRAY_SIZE(snd_pcm_format_names))
215 return "Unknown";
Takashi Iwaie28563c2005-12-01 10:42:42 +0100216 return snd_pcm_format_names[format];
217}
Takashi Iwai6e5265e2009-09-08 14:26:51 +0200218EXPORT_SYMBOL_GPL(snd_pcm_format_name);
219
220#ifdef CONFIG_SND_VERBOSE_PROCFS
221
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
Takashi Iwaie28563c2005-12-01 10:42:42 +0100231
Takashi Iwaie28563c2005-12-01 10:42:42 +0100232static char *snd_pcm_stream_names[] = {
233 STREAM(PLAYBACK),
234 STREAM(CAPTURE),
235};
236
237static 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),
246};
247
248static 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),
254};
255
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256static char *snd_pcm_subformat_names[] = {
257 SUBFORMAT(STD),
258};
259
260static char *snd_pcm_tstamp_mode_names[] = {
261 TSTAMP(NONE),
Jaroslav Kysela8c121582008-01-11 08:45:08 +0100262 TSTAMP(ENABLE),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263};
264
Takashi Iwai877211f2005-11-17 13:59:38 +0100265static const char *snd_pcm_stream_name(int stream)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 return snd_pcm_stream_names[stream];
268}
269
270static const char *snd_pcm_access_name(snd_pcm_access_t access)
271{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 return snd_pcm_access_names[access];
273}
274
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
276{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 return snd_pcm_subformat_names[subformat];
278}
279
Takashi Iwai877211f2005-11-17 13:59:38 +0100280static const char *snd_pcm_tstamp_mode_name(int mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 return snd_pcm_tstamp_mode_names[mode];
283}
284
285static const char *snd_pcm_state_name(snd_pcm_state_t state)
286{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 return snd_pcm_state_names[state];
288}
289
290#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
291#include <linux/soundcard.h>
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100292
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293static const char *snd_pcm_oss_format_name(int format)
294{
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";
318 }
319}
320#endif
321
Takashi Iwai877211f2005-11-17 13:59:38 +0100322static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
323 struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324{
Takashi Iwai877211f2005-11-17 13:59:38 +0100325 struct snd_pcm_info *info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 int err;
327
Takashi Iwai7c22f1a2005-10-10 11:46:31 +0200328 if (! substream)
329 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330
331 info = kmalloc(sizeof(*info), GFP_KERNEL);
332 if (! info) {
333 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
334 return;
335 }
336
337 err = snd_pcm_info(substream, info);
338 if (err < 0) {
339 snd_iprintf(buffer, "error %d\n", err);
340 kfree(info);
341 return;
342 }
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);
355}
356
Takashi Iwai877211f2005-11-17 13:59:38 +0100357static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
358 struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359{
Takashi Iwai877211f2005-11-17 13:59:38 +0100360 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
361 buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362}
363
Takashi Iwai877211f2005-11-17 13:59:38 +0100364static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
365 struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366{
Takashi Iwai877211f2005-11-17 13:59:38 +0100367 snd_pcm_proc_info_read((struct snd_pcm_substream *)entry->private_data,
368 buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369}
370
Takashi Iwai877211f2005-11-17 13:59:38 +0100371static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
372 struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373{
Takashi Iwai877211f2005-11-17 13:59:38 +0100374 struct snd_pcm_substream *substream = entry->private_data;
375 struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 if (!runtime) {
377 snd_iprintf(buffer, "closed\n");
378 return;
379 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
381 snd_iprintf(buffer, "no setup\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 return;
383 }
384 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
385 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
386 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
387 snd_iprintf(buffer, "channels: %u\n", runtime->channels);
388 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
389 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
390 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
392 if (substream->oss.oss) {
393 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
394 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
395 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
396 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
397 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
398 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
399 }
400#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401}
402
Takashi Iwai877211f2005-11-17 13:59:38 +0100403static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
404 struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405{
Takashi Iwai877211f2005-11-17 13:59:38 +0100406 struct snd_pcm_substream *substream = entry->private_data;
407 struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 if (!runtime) {
409 snd_iprintf(buffer, "closed\n");
410 return;
411 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
413 snd_iprintf(buffer, "no setup\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 return;
415 }
416 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
417 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
420 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
421 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
422 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
423 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424}
425
Takashi Iwai877211f2005-11-17 13:59:38 +0100426static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
427 struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428{
Takashi Iwai877211f2005-11-17 13:59:38 +0100429 struct snd_pcm_substream *substream = entry->private_data;
430 struct snd_pcm_runtime *runtime = substream->runtime;
431 struct snd_pcm_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 int err;
433 if (!runtime) {
434 snd_iprintf(buffer, "closed\n");
435 return;
436 }
437 memset(&status, 0, sizeof(status));
438 err = snd_pcm_status(substream, &status);
439 if (err < 0) {
440 snd_iprintf(buffer, "error %d\n", err);
441 return;
442 }
443 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
Clemens Ladische7373b72009-11-10 10:13:30 +0100444 snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
446 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
447 snd_iprintf(buffer, "tstamp : %ld.%09ld\n",
448 status.tstamp.tv_sec, status.tstamp.tv_nsec);
449 snd_iprintf(buffer, "delay : %ld\n", status.delay);
450 snd_iprintf(buffer, "avail : %ld\n", status.avail);
451 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
452 snd_iprintf(buffer, "-----\n");
453 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
454 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
455}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456
Jaroslav Kysela61fb63c2006-04-24 21:57:16 +0200457#ifdef CONFIG_SND_PCM_XRUN_DEBUG
Takashi Iwai877211f2005-11-17 13:59:38 +0100458static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
459 struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460{
Takashi Iwai877211f2005-11-17 13:59:38 +0100461 struct snd_pcm_str *pstr = entry->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
463}
464
Takashi Iwai877211f2005-11-17 13:59:38 +0100465static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
466 struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467{
Takashi Iwai877211f2005-11-17 13:59:38 +0100468 struct snd_pcm_str *pstr = entry->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 char line[64];
470 if (!snd_info_get_line(buffer, line, sizeof(line)))
471 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
472}
473#endif
474
Takashi Iwai877211f2005-11-17 13:59:38 +0100475static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476{
Takashi Iwai877211f2005-11-17 13:59:38 +0100477 struct snd_pcm *pcm = pstr->pcm;
478 struct snd_info_entry *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 char name[16];
480
481 sprintf(name, "pcm%i%c", pcm->device,
482 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
483 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
484 return -ENOMEM;
485 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
486 if (snd_info_register(entry) < 0) {
487 snd_info_free_entry(entry);
488 return -ENOMEM;
489 }
490 pstr->proc_root = entry;
491
492 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
Takashi Iwaibf850202006-04-28 15:13:41 +0200493 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 if (snd_info_register(entry) < 0) {
495 snd_info_free_entry(entry);
496 entry = NULL;
497 }
498 }
499 pstr->proc_info_entry = entry;
500
Jaroslav Kysela61fb63c2006-04-24 21:57:16 +0200501#ifdef CONFIG_SND_PCM_XRUN_DEBUG
Takashi Iwai877211f2005-11-17 13:59:38 +0100502 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
503 pstr->proc_root)) != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 entry->c.text.read = snd_pcm_xrun_debug_read;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 entry->c.text.write = snd_pcm_xrun_debug_write;
Takashi Iwaibd7bf042005-04-12 16:27:28 +0200506 entry->mode |= S_IWUSR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 entry->private_data = pstr;
508 if (snd_info_register(entry) < 0) {
509 snd_info_free_entry(entry);
510 entry = NULL;
511 }
512 }
513 pstr->proc_xrun_debug_entry = entry;
514#endif
515 return 0;
516}
517
Takashi Iwai877211f2005-11-17 13:59:38 +0100518static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519{
Jaroslav Kysela61fb63c2006-04-24 21:57:16 +0200520#ifdef CONFIG_SND_PCM_XRUN_DEBUG
Takashi Iwai746d4a02006-06-23 14:37:59 +0200521 snd_info_free_entry(pstr->proc_xrun_debug_entry);
522 pstr->proc_xrun_debug_entry = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523#endif
Takashi Iwai746d4a02006-06-23 14:37:59 +0200524 snd_info_free_entry(pstr->proc_info_entry);
525 pstr->proc_info_entry = NULL;
526 snd_info_free_entry(pstr->proc_root);
527 pstr->proc_root = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 return 0;
529}
530
Takashi Iwai877211f2005-11-17 13:59:38 +0100531static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532{
Takashi Iwai877211f2005-11-17 13:59:38 +0100533 struct snd_info_entry *entry;
534 struct snd_card *card;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 char name[16];
536
537 card = substream->pcm->card;
538
539 sprintf(name, "sub%i", substream->number);
540 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
541 return -ENOMEM;
542 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
543 if (snd_info_register(entry) < 0) {
544 snd_info_free_entry(entry);
545 return -ENOMEM;
546 }
547 substream->proc_root = entry;
548
549 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
Takashi Iwaibf850202006-04-28 15:13:41 +0200550 snd_info_set_text_ops(entry, substream,
551 snd_pcm_substream_proc_info_read);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 if (snd_info_register(entry) < 0) {
553 snd_info_free_entry(entry);
554 entry = NULL;
555 }
556 }
557 substream->proc_info_entry = entry;
558
559 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
Takashi Iwaibf850202006-04-28 15:13:41 +0200560 snd_info_set_text_ops(entry, substream,
561 snd_pcm_substream_proc_hw_params_read);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 if (snd_info_register(entry) < 0) {
563 snd_info_free_entry(entry);
564 entry = NULL;
565 }
566 }
567 substream->proc_hw_params_entry = entry;
568
569 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
Takashi Iwaibf850202006-04-28 15:13:41 +0200570 snd_info_set_text_ops(entry, substream,
571 snd_pcm_substream_proc_sw_params_read);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 if (snd_info_register(entry) < 0) {
573 snd_info_free_entry(entry);
574 entry = NULL;
575 }
576 }
577 substream->proc_sw_params_entry = entry;
578
579 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
Takashi Iwaibf850202006-04-28 15:13:41 +0200580 snd_info_set_text_ops(entry, substream,
581 snd_pcm_substream_proc_status_read);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 if (snd_info_register(entry) < 0) {
583 snd_info_free_entry(entry);
584 entry = NULL;
585 }
586 }
587 substream->proc_status_entry = entry;
588
589 return 0;
590}
Takashi Iwai746d4a02006-06-23 14:37:59 +0200591
Takashi Iwai877211f2005-11-17 13:59:38 +0100592static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593{
Takashi Iwai746d4a02006-06-23 14:37:59 +0200594 snd_info_free_entry(substream->proc_info_entry);
595 substream->proc_info_entry = NULL;
596 snd_info_free_entry(substream->proc_hw_params_entry);
597 substream->proc_hw_params_entry = NULL;
598 snd_info_free_entry(substream->proc_sw_params_entry);
599 substream->proc_sw_params_entry = NULL;
600 snd_info_free_entry(substream->proc_status_entry);
601 substream->proc_status_entry = NULL;
602 snd_info_free_entry(substream->proc_root);
603 substream->proc_root = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 return 0;
605}
Takashi Iwaib7d90a32006-04-25 12:56:04 +0200606#else /* !CONFIG_SND_VERBOSE_PROCFS */
Takashi Iwaie28563c2005-12-01 10:42:42 +0100607static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
608static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
609static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
610static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
Takashi Iwaib7d90a32006-04-25 12:56:04 +0200611#endif /* CONFIG_SND_VERBOSE_PROCFS */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612
613/**
614 * snd_pcm_new_stream - create a new PCM stream
615 * @pcm: the pcm instance
616 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
617 * @substream_count: the number of substreams
618 *
619 * Creates a new stream for the pcm.
620 * The corresponding stream on the pcm must have been empty before
621 * calling this, i.e. zero must be given to the argument of
622 * snd_pcm_new().
623 *
624 * Returns zero if successful, or a negative error code on failure.
625 */
Takashi Iwai877211f2005-11-17 13:59:38 +0100626int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627{
628 int idx, err;
Takashi Iwai877211f2005-11-17 13:59:38 +0100629 struct snd_pcm_str *pstr = &pcm->streams[stream];
630 struct snd_pcm_substream *substream, *prev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631
632#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100633 mutex_init(&pstr->oss.setup_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634#endif
635 pstr->stream = stream;
636 pstr->pcm = pcm;
637 pstr->substream_count = substream_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 if (substream_count > 0) {
639 err = snd_pcm_stream_proc_init(pstr);
Takashi Iwai73e77ba2005-11-17 17:44:01 +0100640 if (err < 0) {
641 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 return err;
Takashi Iwai73e77ba2005-11-17 17:44:01 +0100643 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 }
645 prev = NULL;
646 for (idx = 0, prev = NULL; idx < substream_count; idx++) {
Takashi Iwaica2c0962005-09-09 14:20:23 +0200647 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
Takashi Iwai73e77ba2005-11-17 17:44:01 +0100648 if (substream == NULL) {
649 snd_printk(KERN_ERR "Cannot allocate PCM substream\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 return -ENOMEM;
Takashi Iwai73e77ba2005-11-17 17:44:01 +0100651 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 substream->pcm = pcm;
653 substream->pstr = pstr;
654 substream->number = idx;
655 substream->stream = stream;
656 sprintf(substream->name, "subdevice #%i", idx);
657 substream->buffer_bytes_max = UINT_MAX;
658 if (prev == NULL)
659 pstr->substream = substream;
660 else
661 prev->next = substream;
662 err = snd_pcm_substream_proc_init(substream);
663 if (err < 0) {
Takashi Iwai73e77ba2005-11-17 17:44:01 +0100664 snd_printk(KERN_ERR "Error in snd_pcm_stream_proc_init\n");
Akinobu Mita4d361282006-11-23 12:03:24 +0100665 if (prev == NULL)
666 pstr->substream = NULL;
667 else
668 prev->next = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669 kfree(substream);
670 return err;
671 }
672 substream->group = &substream->self_group;
673 spin_lock_init(&substream->self_group.lock);
674 INIT_LIST_HEAD(&substream->self_group.substreams);
675 list_add_tail(&substream->link_list, &substream->self_group.substreams);
Takashi Iwai9c323fc2006-04-28 15:13:41 +0200676 atomic_set(&substream->mmap_count, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 prev = substream;
678 }
679 return 0;
680}
681
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200682EXPORT_SYMBOL(snd_pcm_new_stream);
683
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684/**
685 * snd_pcm_new - create a new PCM instance
686 * @card: the card instance
687 * @id: the id string
688 * @device: the device index (zero based)
689 * @playback_count: the number of substreams for playback
690 * @capture_count: the number of substreams for capture
691 * @rpcm: the pointer to store the new pcm instance
692 *
693 * Creates a new PCM instance.
694 *
695 * The pcm operators have to be set afterwards to the new instance
696 * via snd_pcm_set_ops().
697 *
698 * Returns zero if successful, or a negative error code on failure.
699 */
Tim Blechmanne6161652009-02-05 13:01:54 +0100700int snd_pcm_new(struct snd_card *card, const char *id, int device,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 int playback_count, int capture_count,
Takashi Iwai877211f2005-11-17 13:59:38 +0100702 struct snd_pcm ** rpcm)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703{
Takashi Iwai877211f2005-11-17 13:59:38 +0100704 struct snd_pcm *pcm;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 int err;
Takashi Iwai877211f2005-11-17 13:59:38 +0100706 static struct snd_device_ops ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 .dev_free = snd_pcm_dev_free,
708 .dev_register = snd_pcm_dev_register,
709 .dev_disconnect = snd_pcm_dev_disconnect,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 };
711
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200712 if (snd_BUG_ON(!card))
713 return -ENXIO;
714 if (rpcm)
715 *rpcm = NULL;
Takashi Iwaica2c0962005-09-09 14:20:23 +0200716 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
Takashi Iwai73e77ba2005-11-17 17:44:01 +0100717 if (pcm == NULL) {
718 snd_printk(KERN_ERR "Cannot allocate PCM\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719 return -ENOMEM;
Takashi Iwai73e77ba2005-11-17 17:44:01 +0100720 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721 pcm->card = card;
722 pcm->device = device;
Takashi Iwai73e77ba2005-11-17 17:44:01 +0100723 if (id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 strlcpy(pcm->id, id, sizeof(pcm->id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
726 snd_pcm_free(pcm);
727 return err;
728 }
729 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
730 snd_pcm_free(pcm);
731 return err;
732 }
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100733 mutex_init(&pcm->open_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 init_waitqueue_head(&pcm->open_wait);
735 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
736 snd_pcm_free(pcm);
737 return err;
738 }
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200739 if (rpcm)
740 *rpcm = pcm;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 return 0;
742}
743
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200744EXPORT_SYMBOL(snd_pcm_new);
745
Takashi Iwai877211f2005-11-17 13:59:38 +0100746static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747{
Takashi Iwai877211f2005-11-17 13:59:38 +0100748 struct snd_pcm_substream *substream, *substream_next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
Takashi Iwai877211f2005-11-17 13:59:38 +0100750 struct snd_pcm_oss_setup *setup, *setupn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751#endif
752 substream = pstr->substream;
753 while (substream) {
754 substream_next = substream->next;
Takashi Iwaic4614822006-06-23 14:38:23 +0200755 snd_pcm_timer_done(substream);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756 snd_pcm_substream_proc_done(substream);
757 kfree(substream);
758 substream = substream_next;
759 }
760 snd_pcm_stream_proc_done(pstr);
761#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
762 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
763 setupn = setup->next;
764 kfree(setup->task_name);
765 kfree(setup);
766 }
767#endif
768}
769
Takashi Iwai877211f2005-11-17 13:59:38 +0100770static int snd_pcm_free(struct snd_pcm *pcm)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771{
Takashi Iwaic4614822006-06-23 14:38:23 +0200772 struct snd_pcm_notify *notify;
773
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200774 if (!pcm)
775 return 0;
Takashi Iwaic4614822006-06-23 14:38:23 +0200776 list_for_each_entry(notify, &snd_pcm_notify_list, list) {
777 notify->n_unregister(pcm);
778 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 if (pcm->private_free)
780 pcm->private_free(pcm);
781 snd_pcm_lib_preallocate_free_for_all(pcm);
782 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
783 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
784 kfree(pcm);
785 return 0;
786}
787
Takashi Iwai877211f2005-11-17 13:59:38 +0100788static int snd_pcm_dev_free(struct snd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789{
Takashi Iwai877211f2005-11-17 13:59:38 +0100790 struct snd_pcm *pcm = device->device_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 return snd_pcm_free(pcm);
792}
793
Takashi Iwai3bf75f92006-03-27 16:40:49 +0200794int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
795 struct file *file,
796 struct snd_pcm_substream **rsubstream)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797{
Takashi Iwai877211f2005-11-17 13:59:38 +0100798 struct snd_pcm_str * pstr;
799 struct snd_pcm_substream *substream;
800 struct snd_pcm_runtime *runtime;
801 struct snd_ctl_file *kctl;
802 struct snd_card *card;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803 int prefer_subdevice = -1;
804 size_t size;
805
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200806 if (snd_BUG_ON(!pcm || !rsubstream))
807 return -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 *rsubstream = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809 pstr = &pcm->streams[stream];
Takashi Iwai3bf75f92006-03-27 16:40:49 +0200810 if (pstr->substream == NULL || pstr->substream_count == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811 return -ENODEV;
812
813 card = pcm->card;
Takashi Iwai399ccdc2008-09-25 14:51:03 +0200814 read_lock(&card->ctl_files_rwlock);
Johannes Berg9244b2c2006-10-05 16:02:22 +0200815 list_for_each_entry(kctl, &card->ctl_files, list) {
Clemens Ladisch25d27ed2009-11-02 09:35:44 +0100816 if (kctl->pid == task_pid(current)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817 prefer_subdevice = kctl->prefer_pcm_subdevice;
Takashi Iwai2529bba2006-08-04 12:57:19 +0200818 if (prefer_subdevice != -1)
819 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820 }
821 }
Takashi Iwai399ccdc2008-09-25 14:51:03 +0200822 read_unlock(&card->ctl_files_rwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824 switch (stream) {
825 case SNDRV_PCM_STREAM_PLAYBACK:
826 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
827 for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
828 if (SUBSTREAM_BUSY(substream))
829 return -EAGAIN;
830 }
831 }
832 break;
833 case SNDRV_PCM_STREAM_CAPTURE:
834 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
835 for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
836 if (SUBSTREAM_BUSY(substream))
837 return -EAGAIN;
838 }
839 }
840 break;
841 default:
842 return -EINVAL;
843 }
844
Takashi Iwai0df63e42006-04-28 15:13:41 +0200845 if (file->f_flags & O_APPEND) {
846 if (prefer_subdevice < 0) {
847 if (pstr->substream_count > 1)
848 return -EINVAL; /* must be unique */
849 substream = pstr->substream;
850 } else {
851 for (substream = pstr->substream; substream;
852 substream = substream->next)
853 if (substream->number == prefer_subdevice)
854 break;
855 }
856 if (! substream)
857 return -ENODEV;
858 if (! SUBSTREAM_BUSY(substream))
859 return -EBADFD;
860 substream->ref_count++;
861 *rsubstream = substream;
862 return 0;
863 }
864
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865 if (prefer_subdevice >= 0) {
866 for (substream = pstr->substream; substream; substream = substream->next)
867 if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
868 goto __ok;
869 }
870 for (substream = pstr->substream; substream; substream = substream->next)
871 if (!SUBSTREAM_BUSY(substream))
872 break;
873 __ok:
874 if (substream == NULL)
875 return -EAGAIN;
876
Takashi Iwaica2c0962005-09-09 14:20:23 +0200877 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878 if (runtime == NULL)
879 return -ENOMEM;
880
Takashi Iwai877211f2005-11-17 13:59:38 +0100881 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882 runtime->status = snd_malloc_pages(size, GFP_KERNEL);
883 if (runtime->status == NULL) {
884 kfree(runtime);
885 return -ENOMEM;
886 }
887 memset((void*)runtime->status, 0, size);
888
Takashi Iwai877211f2005-11-17 13:59:38 +0100889 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890 runtime->control = snd_malloc_pages(size, GFP_KERNEL);
891 if (runtime->control == NULL) {
Takashi Iwai877211f2005-11-17 13:59:38 +0100892 snd_free_pages((void*)runtime->status,
893 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894 kfree(runtime);
895 return -ENOMEM;
896 }
897 memset((void*)runtime->control, 0, size);
898
899 init_waitqueue_head(&runtime->sleep);
Jaroslav Kyselac91a9882010-01-21 10:32:15 +0100900 init_waitqueue_head(&runtime->tsleep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901
902 runtime->status->state = SNDRV_PCM_STATE_OPEN;
903
904 substream->runtime = runtime;
905 substream->private_data = pcm->private_data;
Takashi Iwai0df63e42006-04-28 15:13:41 +0200906 substream->ref_count = 1;
907 substream->f_flags = file->f_flags;
Clemens Ladische7373b72009-11-10 10:13:30 +0100908 substream->pid = get_pid(task_pid(current));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909 pstr->substream_opened++;
910 *rsubstream = substream;
911 return 0;
912}
913
Takashi Iwai3bf75f92006-03-27 16:40:49 +0200914void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915{
Takashi Iwai877211f2005-11-17 13:59:38 +0100916 struct snd_pcm_runtime *runtime;
Takashi Iwai0df63e42006-04-28 15:13:41 +0200917
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200918 if (PCM_RUNTIME_CHECK(substream))
919 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920 runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921 if (runtime->private_free != NULL)
922 runtime->private_free(runtime);
Takashi Iwai877211f2005-11-17 13:59:38 +0100923 snd_free_pages((void*)runtime->status,
924 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
925 snd_free_pages((void*)runtime->control,
926 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927 kfree(runtime->hw_constraints.rules);
Jaroslav Kysela4d96eb22009-12-20 11:47:57 +0100928#ifdef CONFIG_SND_PCM_XRUN_DEBUG
929 if (runtime->hwptr_log)
930 kfree(runtime->hwptr_log);
931#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932 kfree(runtime);
933 substream->runtime = NULL;
Clemens Ladische7373b72009-11-10 10:13:30 +0100934 put_pid(substream->pid);
935 substream->pid = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936 substream->pstr->substream_opened--;
937}
938
Greg Kroah-Hartmand80f19f2006-08-07 22:19:37 -0700939static ssize_t show_pcm_class(struct device *dev,
940 struct device_attribute *attr, char *buf)
Takashi Iwai9d19f482006-09-06 14:27:46 +0200941{
942 struct snd_pcm *pcm;
943 const char *str;
944 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
945 [SNDRV_PCM_CLASS_GENERIC] = "generic",
946 [SNDRV_PCM_CLASS_MULTI] = "multi",
947 [SNDRV_PCM_CLASS_MODEM] = "modem",
948 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
949 };
950
Greg Kroah-Hartmand80f19f2006-08-07 22:19:37 -0700951 if (! (pcm = dev_get_drvdata(dev)) ||
Takashi Iwai9d19f482006-09-06 14:27:46 +0200952 pcm->dev_class > SNDRV_PCM_CLASS_LAST)
953 str = "none";
954 else
955 str = strs[pcm->dev_class];
956 return snprintf(buf, PAGE_SIZE, "%s\n", str);
957}
958
Greg Kroah-Hartmand80f19f2006-08-07 22:19:37 -0700959static struct device_attribute pcm_attrs =
Takashi Iwai9d19f482006-09-06 14:27:46 +0200960 __ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
961
Takashi Iwai877211f2005-11-17 13:59:38 +0100962static int snd_pcm_dev_register(struct snd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963{
Clemens Ladischf87135f2005-11-20 14:06:59 +0100964 int cidx, err;
Takashi Iwai877211f2005-11-17 13:59:38 +0100965 struct snd_pcm_substream *substream;
Johannes Berg9244b2c2006-10-05 16:02:22 +0200966 struct snd_pcm_notify *notify;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967 char str[16];
Julia Lawall4b3be6a2009-10-17 08:33:22 +0200968 struct snd_pcm *pcm;
Johannes Bergc78085f2006-10-05 15:06:34 +0200969 struct device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970
Julia Lawall4b3be6a2009-10-17 08:33:22 +0200971 if (snd_BUG_ON(!device || !device->device_data))
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200972 return -ENXIO;
Julia Lawall4b3be6a2009-10-17 08:33:22 +0200973 pcm = device->device_data;
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100974 mutex_lock(&register_mutex);
Pawel MOLLf90c06a2008-07-30 12:46:40 +0100975 err = snd_pcm_add(pcm);
976 if (err) {
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100977 mutex_unlock(&register_mutex);
Pawel MOLLf90c06a2008-07-30 12:46:40 +0100978 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980 for (cidx = 0; cidx < 2; cidx++) {
981 int devtype = -1;
982 if (pcm->streams[cidx].substream == NULL)
983 continue;
984 switch (cidx) {
985 case SNDRV_PCM_STREAM_PLAYBACK:
986 sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
988 break;
989 case SNDRV_PCM_STREAM_CAPTURE:
990 sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
992 break;
993 }
Johannes Bergc78085f2006-10-05 15:06:34 +0200994 /* device pointer to use, pcm->dev takes precedence if
995 * it is assigned, otherwise fall back to card's device
996 * if possible */
997 dev = pcm->dev;
998 if (!dev)
Takashi Iwaic2902c82007-02-09 16:25:48 +0100999 dev = snd_card_get_device_link(pcm->card);
Johannes Bergc78085f2006-10-05 15:06:34 +02001000 /* register pcm */
1001 err = snd_register_device_for_dev(devtype, pcm->card,
1002 pcm->device,
1003 &snd_pcm_f_ops[cidx],
1004 pcm, str, dev);
1005 if (err < 0) {
Clemens Ladischf87135f2005-11-20 14:06:59 +01001006 list_del(&pcm->list);
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001007 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008 return err;
1009 }
Takashi Iwai9d19f482006-09-06 14:27:46 +02001010 snd_add_device_sysfs_file(devtype, pcm->card, pcm->device,
1011 &pcm_attrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1013 snd_pcm_timer_init(substream);
1014 }
Johannes Berg9244b2c2006-10-05 16:02:22 +02001015
1016 list_for_each_entry(notify, &snd_pcm_notify_list, list)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 notify->n_register(pcm);
Johannes Berg9244b2c2006-10-05 16:02:22 +02001018
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001019 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020 return 0;
1021}
1022
Takashi Iwai877211f2005-11-17 13:59:38 +01001023static int snd_pcm_dev_disconnect(struct snd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024{
Takashi Iwai877211f2005-11-17 13:59:38 +01001025 struct snd_pcm *pcm = device->device_data;
Takashi Iwaic4614822006-06-23 14:38:23 +02001026 struct snd_pcm_notify *notify;
Takashi Iwai877211f2005-11-17 13:59:38 +01001027 struct snd_pcm_substream *substream;
Takashi Iwaic4614822006-06-23 14:38:23 +02001028 int cidx, devtype;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001030 mutex_lock(&register_mutex);
Takashi Iwaic4614822006-06-23 14:38:23 +02001031 if (list_empty(&pcm->list))
1032 goto unlock;
1033
Clemens Ladischf87135f2005-11-20 14:06:59 +01001034 list_del_init(&pcm->list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035 for (cidx = 0; cidx < 2; cidx++)
1036 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1037 if (substream->runtime)
1038 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
Takashi Iwaic4614822006-06-23 14:38:23 +02001039 list_for_each_entry(notify, &snd_pcm_notify_list, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040 notify->n_disconnect(pcm);
1041 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 for (cidx = 0; cidx < 2; cidx++) {
1043 devtype = -1;
1044 switch (cidx) {
1045 case SNDRV_PCM_STREAM_PLAYBACK:
1046 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1047 break;
1048 case SNDRV_PCM_STREAM_CAPTURE:
1049 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1050 break;
1051 }
1052 snd_unregister_device(devtype, pcm->card, pcm->device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 }
Takashi Iwaic4614822006-06-23 14:38:23 +02001054 unlock:
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001055 mutex_unlock(&register_mutex);
Takashi Iwaic4614822006-06-23 14:38:23 +02001056 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057}
1058
Takashi Iwai877211f2005-11-17 13:59:38 +01001059int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060{
Johannes Berg9244b2c2006-10-05 16:02:22 +02001061 struct snd_pcm *pcm;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001063 if (snd_BUG_ON(!notify ||
1064 !notify->n_register ||
1065 !notify->n_unregister ||
1066 !notify->n_disconnect))
1067 return -EINVAL;
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001068 mutex_lock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069 if (nfree) {
1070 list_del(&notify->list);
Johannes Berg9244b2c2006-10-05 16:02:22 +02001071 list_for_each_entry(pcm, &snd_pcm_devices, list)
1072 notify->n_unregister(pcm);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073 } else {
1074 list_add_tail(&notify->list, &snd_pcm_notify_list);
Johannes Berg9244b2c2006-10-05 16:02:22 +02001075 list_for_each_entry(pcm, &snd_pcm_devices, list)
1076 notify->n_register(pcm);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 }
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001078 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079 return 0;
1080}
1081
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001082EXPORT_SYMBOL(snd_pcm_notify);
1083
Takashi Iwaie28563c2005-12-01 10:42:42 +01001084#ifdef CONFIG_PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085/*
1086 * Info interface
1087 */
1088
Takashi Iwai877211f2005-11-17 13:59:38 +01001089static void snd_pcm_proc_read(struct snd_info_entry *entry,
1090 struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091{
Takashi Iwai877211f2005-11-17 13:59:38 +01001092 struct snd_pcm *pcm;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001094 mutex_lock(&register_mutex);
Johannes Berg9244b2c2006-10-05 16:02:22 +02001095 list_for_each_entry(pcm, &snd_pcm_devices, list) {
Clemens Ladischf87135f2005-11-20 14:06:59 +01001096 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1097 pcm->card->number, pcm->device, pcm->id, pcm->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
Takashi Iwai877211f2005-11-17 13:59:38 +01001099 snd_iprintf(buffer, " : playback %i",
1100 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
Takashi Iwai877211f2005-11-17 13:59:38 +01001102 snd_iprintf(buffer, " : capture %i",
1103 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104 snd_iprintf(buffer, "\n");
1105 }
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001106 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107}
1108
Takashi Iwai6581f4e2006-05-17 17:14:51 +02001109static struct snd_info_entry *snd_pcm_proc_entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110
Takashi Iwaie28563c2005-12-01 10:42:42 +01001111static void snd_pcm_proc_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112{
Takashi Iwai877211f2005-11-17 13:59:38 +01001113 struct snd_info_entry *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
Takashi Iwaibf850202006-04-28 15:13:41 +02001116 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117 if (snd_info_register(entry) < 0) {
1118 snd_info_free_entry(entry);
1119 entry = NULL;
1120 }
1121 }
1122 snd_pcm_proc_entry = entry;
Takashi Iwaie28563c2005-12-01 10:42:42 +01001123}
1124
1125static void snd_pcm_proc_done(void)
1126{
Takashi Iwai746d4a02006-06-23 14:37:59 +02001127 snd_info_free_entry(snd_pcm_proc_entry);
Takashi Iwaie28563c2005-12-01 10:42:42 +01001128}
1129
1130#else /* !CONFIG_PROC_FS */
1131#define snd_pcm_proc_init()
1132#define snd_pcm_proc_done()
1133#endif /* CONFIG_PROC_FS */
1134
1135
1136/*
1137 * ENTRY functions
1138 */
1139
1140static int __init alsa_pcm_init(void)
1141{
1142 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1143 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1144 snd_pcm_proc_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145 return 0;
1146}
1147
1148static void __exit alsa_pcm_exit(void)
1149{
1150 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1151 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
Takashi Iwaie28563c2005-12-01 10:42:42 +01001152 snd_pcm_proc_done();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153}
1154
1155module_init(alsa_pcm_init)
1156module_exit(alsa_pcm_exit)