blob: 308c9ecf73db18415aa1157ee4e895731a5abc36 [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>
Paul Gortmakerda155d52011-07-15 12:38:28 -040024#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <linux/time.h>
Ingo Molnar1a60d4c2006-01-16 16:29:08 +010026#include <linux/mutex.h>
Paul Gortmaker51990e82012-01-22 11:23:42 -050027#include <linux/device.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include <sound/core.h>
29#include <sound/minors.h>
30#include <sound/pcm.h>
31#include <sound/control.h>
32#include <sound/info.h>
33
Jaroslav Kyselac1017a42007-10-15 09:50:19 +020034MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
Linus Torvalds1da177e2005-04-16 15:20:36 -070035MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
36MODULE_LICENSE("GPL");
37
Clemens Ladischf87135f2005-11-20 14:06:59 +010038static LIST_HEAD(snd_pcm_devices);
Linus Torvalds1da177e2005-04-16 15:20:36 -070039static LIST_HEAD(snd_pcm_notify_list);
Ingo Molnar1a60d4c2006-01-16 16:29:08 +010040static DEFINE_MUTEX(register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
Takashi Iwai877211f2005-11-17 13:59:38 +010042static int snd_pcm_free(struct snd_pcm *pcm);
43static int snd_pcm_dev_free(struct snd_device *device);
44static int snd_pcm_dev_register(struct snd_device *device);
45static int snd_pcm_dev_disconnect(struct snd_device *device);
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
Pawel MOLLf90c06a2008-07-30 12:46:40 +010047static struct snd_pcm *snd_pcm_get(struct snd_card *card, int device)
Clemens Ladischf87135f2005-11-20 14:06:59 +010048{
Clemens Ladischf87135f2005-11-20 14:06:59 +010049 struct snd_pcm *pcm;
50
Johannes Berg9244b2c2006-10-05 16:02:22 +020051 list_for_each_entry(pcm, &snd_pcm_devices, list) {
Clemens Ladischf87135f2005-11-20 14:06:59 +010052 if (pcm->card == card && pcm->device == device)
53 return pcm;
54 }
55 return NULL;
56}
57
Pawel MOLLf90c06a2008-07-30 12:46:40 +010058static int snd_pcm_next(struct snd_card *card, int device)
59{
60 struct snd_pcm *pcm;
61
62 list_for_each_entry(pcm, &snd_pcm_devices, list) {
63 if (pcm->card == card && pcm->device > device)
64 return pcm->device;
65 else if (pcm->card->number > card->number)
66 return -1;
67 }
68 return -1;
69}
70
71static int snd_pcm_add(struct snd_pcm *newpcm)
72{
73 struct snd_pcm *pcm;
74
Takashi Iwaib95bd3a2015-02-20 16:49:04 +010075 if (newpcm->internal)
76 return 0;
77
Pawel MOLLf90c06a2008-07-30 12:46:40 +010078 list_for_each_entry(pcm, &snd_pcm_devices, list) {
79 if (pcm->card == newpcm->card && pcm->device == newpcm->device)
80 return -EBUSY;
81 if (pcm->card->number > newpcm->card->number ||
82 (pcm->card == newpcm->card &&
83 pcm->device > newpcm->device)) {
84 list_add(&newpcm->list, pcm->list.prev);
85 return 0;
86 }
87 }
88 list_add_tail(&newpcm->list, &snd_pcm_devices);
89 return 0;
90}
91
Takashi Iwai877211f2005-11-17 13:59:38 +010092static int snd_pcm_control_ioctl(struct snd_card *card,
93 struct snd_ctl_file *control,
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 unsigned int cmd, unsigned long arg)
95{
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 switch (cmd) {
97 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
98 {
99 int device;
100
101 if (get_user(device, (int __user *)arg))
102 return -EFAULT;
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100103 mutex_lock(&register_mutex);
Pawel MOLLf90c06a2008-07-30 12:46:40 +0100104 device = snd_pcm_next(card, device);
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100105 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 if (put_user(device, (int __user *)arg))
107 return -EFAULT;
108 return 0;
109 }
110 case SNDRV_CTL_IOCTL_PCM_INFO:
111 {
Takashi Iwai877211f2005-11-17 13:59:38 +0100112 struct snd_pcm_info __user *info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 unsigned int device, subdevice;
Takashi Iwai877211f2005-11-17 13:59:38 +0100114 int stream;
115 struct snd_pcm *pcm;
116 struct snd_pcm_str *pstr;
117 struct snd_pcm_substream *substream;
Clemens Ladischf87135f2005-11-20 14:06:59 +0100118 int err;
119
Takashi Iwai877211f2005-11-17 13:59:38 +0100120 info = (struct snd_pcm_info __user *)arg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 if (get_user(device, &info->device))
122 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 if (get_user(stream, &info->stream))
124 return -EFAULT;
125 if (stream < 0 || stream > 1)
126 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 if (get_user(subdevice, &info->subdevice))
128 return -EFAULT;
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100129 mutex_lock(&register_mutex);
Pawel MOLLf90c06a2008-07-30 12:46:40 +0100130 pcm = snd_pcm_get(card, device);
Clemens Ladischf87135f2005-11-20 14:06:59 +0100131 if (pcm == NULL) {
132 err = -ENXIO;
133 goto _error;
134 }
135 pstr = &pcm->streams[stream];
136 if (pstr->substream_count == 0) {
137 err = -ENOENT;
138 goto _error;
139 }
140 if (subdevice >= pstr->substream_count) {
141 err = -ENXIO;
142 goto _error;
143 }
144 for (substream = pstr->substream; substream;
145 substream = substream->next)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 if (substream->number == (int)subdevice)
147 break;
Clemens Ladischf87135f2005-11-20 14:06:59 +0100148 if (substream == NULL) {
149 err = -ENXIO;
150 goto _error;
151 }
152 err = snd_pcm_info_user(substream, info);
153 _error:
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100154 mutex_unlock(&register_mutex);
Clemens Ladischf87135f2005-11-20 14:06:59 +0100155 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 }
157 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
158 {
159 int val;
160
161 if (get_user(val, (int __user *)arg))
162 return -EFAULT;
Takashi Iwai23c18d42014-02-19 14:30:29 +0100163 control->preferred_subdevice[SND_CTL_SUBDEV_PCM] = val;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 return 0;
165 }
166 }
167 return -ENOIOCTLCMD;
168}
Jaroslav Kysela21a34792006-01-13 09:12:11 +0100169
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170#define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172static char *snd_pcm_format_names[] = {
173 FORMAT(S8),
174 FORMAT(U8),
175 FORMAT(S16_LE),
176 FORMAT(S16_BE),
177 FORMAT(U16_LE),
178 FORMAT(U16_BE),
179 FORMAT(S24_LE),
180 FORMAT(S24_BE),
181 FORMAT(U24_LE),
182 FORMAT(U24_BE),
183 FORMAT(S32_LE),
184 FORMAT(S32_BE),
185 FORMAT(U32_LE),
186 FORMAT(U32_BE),
187 FORMAT(FLOAT_LE),
188 FORMAT(FLOAT_BE),
189 FORMAT(FLOAT64_LE),
190 FORMAT(FLOAT64_BE),
191 FORMAT(IEC958_SUBFRAME_LE),
192 FORMAT(IEC958_SUBFRAME_BE),
193 FORMAT(MU_LAW),
194 FORMAT(A_LAW),
195 FORMAT(IMA_ADPCM),
196 FORMAT(MPEG),
197 FORMAT(GSM),
198 FORMAT(SPECIAL),
199 FORMAT(S24_3LE),
200 FORMAT(S24_3BE),
201 FORMAT(U24_3LE),
202 FORMAT(U24_3BE),
203 FORMAT(S20_3LE),
204 FORMAT(S20_3BE),
205 FORMAT(U20_3LE),
206 FORMAT(U20_3BE),
207 FORMAT(S18_3LE),
208 FORMAT(S18_3BE),
209 FORMAT(U18_3LE),
210 FORMAT(U18_3BE),
Dan Carpenter7a288262010-08-27 22:02:15 +0200211 FORMAT(G723_24),
212 FORMAT(G723_24_1B),
213 FORMAT(G723_40),
214 FORMAT(G723_40_1B),
Daniel Mackef7a4f92013-04-17 00:01:36 +0800215 FORMAT(DSD_U8),
216 FORMAT(DSD_U16_LE),
Jurgen Kramerd4288d32014-09-05 10:47:56 +0200217 FORMAT(DSD_U32_LE),
Jussi Laakod42472e2014-11-21 16:04:46 +0200218 FORMAT(DSD_U16_BE),
219 FORMAT(DSD_U32_BE),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220};
221
Takashi Iwai30b771c2014-10-30 15:02:50 +0100222/**
223 * snd_pcm_format_name - Return a name string for the given PCM format
224 * @format: PCM format
225 */
Takashi Iwai6e5265e2009-09-08 14:26:51 +0200226const char *snd_pcm_format_name(snd_pcm_format_t format)
Takashi Iwaie28563c2005-12-01 10:42:42 +0100227{
Clemens Ladischfea952e2011-02-14 11:00:47 +0100228 if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names))
Dan Carpenter7a288262010-08-27 22:02:15 +0200229 return "Unknown";
Clemens Ladischfea952e2011-02-14 11:00:47 +0100230 return snd_pcm_format_names[(__force unsigned int)format];
Takashi Iwaie28563c2005-12-01 10:42:42 +0100231}
Takashi Iwai6e5265e2009-09-08 14:26:51 +0200232EXPORT_SYMBOL_GPL(snd_pcm_format_name);
233
234#ifdef CONFIG_SND_VERBOSE_PROCFS
235
236#define STATE(v) [SNDRV_PCM_STATE_##v] = #v
237#define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
238#define READY(v) [SNDRV_PCM_READY_##v] = #v
239#define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
240#define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
241#define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
242#define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
243#define START(v) [SNDRV_PCM_START_##v] = #v
244#define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
Takashi Iwaie28563c2005-12-01 10:42:42 +0100245
Takashi Iwaie28563c2005-12-01 10:42:42 +0100246static char *snd_pcm_stream_names[] = {
247 STREAM(PLAYBACK),
248 STREAM(CAPTURE),
249};
250
251static char *snd_pcm_state_names[] = {
252 STATE(OPEN),
253 STATE(SETUP),
254 STATE(PREPARED),
255 STATE(RUNNING),
256 STATE(XRUN),
257 STATE(DRAINING),
258 STATE(PAUSED),
259 STATE(SUSPENDED),
260};
261
262static char *snd_pcm_access_names[] = {
263 ACCESS(MMAP_INTERLEAVED),
264 ACCESS(MMAP_NONINTERLEAVED),
265 ACCESS(MMAP_COMPLEX),
266 ACCESS(RW_INTERLEAVED),
267 ACCESS(RW_NONINTERLEAVED),
268};
269
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270static char *snd_pcm_subformat_names[] = {
271 SUBFORMAT(STD),
272};
273
274static char *snd_pcm_tstamp_mode_names[] = {
275 TSTAMP(NONE),
Jaroslav Kysela8c121582008-01-11 08:45:08 +0100276 TSTAMP(ENABLE),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277};
278
Takashi Iwai877211f2005-11-17 13:59:38 +0100279static const char *snd_pcm_stream_name(int stream)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 return snd_pcm_stream_names[stream];
282}
283
284static const char *snd_pcm_access_name(snd_pcm_access_t access)
285{
Clemens Ladischfea952e2011-02-14 11:00:47 +0100286 return snd_pcm_access_names[(__force int)access];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287}
288
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
290{
Clemens Ladischfea952e2011-02-14 11:00:47 +0100291 return snd_pcm_subformat_names[(__force int)subformat];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292}
293
Takashi Iwai877211f2005-11-17 13:59:38 +0100294static const char *snd_pcm_tstamp_mode_name(int mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 return snd_pcm_tstamp_mode_names[mode];
297}
298
299static const char *snd_pcm_state_name(snd_pcm_state_t state)
300{
Clemens Ladischfea952e2011-02-14 11:00:47 +0100301 return snd_pcm_state_names[(__force int)state];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302}
303
Takashi Iwai8eeaa2f2014-02-10 09:48:47 +0100304#if IS_ENABLED(CONFIG_SND_PCM_OSS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305#include <linux/soundcard.h>
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100306
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307static const char *snd_pcm_oss_format_name(int format)
308{
309 switch (format) {
310 case AFMT_MU_LAW:
311 return "MU_LAW";
312 case AFMT_A_LAW:
313 return "A_LAW";
314 case AFMT_IMA_ADPCM:
315 return "IMA_ADPCM";
316 case AFMT_U8:
317 return "U8";
318 case AFMT_S16_LE:
319 return "S16_LE";
320 case AFMT_S16_BE:
321 return "S16_BE";
322 case AFMT_S8:
323 return "S8";
324 case AFMT_U16_LE:
325 return "U16_LE";
326 case AFMT_U16_BE:
327 return "U16_BE";
328 case AFMT_MPEG:
329 return "MPEG";
330 default:
331 return "unknown";
332 }
333}
334#endif
335
Takashi Iwai877211f2005-11-17 13:59:38 +0100336static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
337 struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338{
Takashi Iwai877211f2005-11-17 13:59:38 +0100339 struct snd_pcm_info *info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 int err;
341
Takashi Iwai7c22f1a2005-10-10 11:46:31 +0200342 if (! substream)
343 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344
345 info = kmalloc(sizeof(*info), GFP_KERNEL);
Takashi Iwaiec0e9932015-03-10 15:42:14 +0100346 if (!info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348
349 err = snd_pcm_info(substream, info);
350 if (err < 0) {
351 snd_iprintf(buffer, "error %d\n", err);
352 kfree(info);
353 return;
354 }
355 snd_iprintf(buffer, "card: %d\n", info->card);
356 snd_iprintf(buffer, "device: %d\n", info->device);
357 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
358 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
359 snd_iprintf(buffer, "id: %s\n", info->id);
360 snd_iprintf(buffer, "name: %s\n", info->name);
361 snd_iprintf(buffer, "subname: %s\n", info->subname);
362 snd_iprintf(buffer, "class: %d\n", info->dev_class);
363 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
364 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
365 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
366 kfree(info);
367}
368
Takashi Iwai877211f2005-11-17 13:59:38 +0100369static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
370 struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371{
Takashi Iwai877211f2005-11-17 13:59:38 +0100372 snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
373 buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374}
375
Takashi Iwai877211f2005-11-17 13:59:38 +0100376static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
377 struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378{
Joe Perches9fe856e2010-09-04 18:52:54 -0700379 snd_pcm_proc_info_read(entry->private_data, buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380}
381
Takashi Iwai877211f2005-11-17 13:59:38 +0100382static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
383 struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384{
Takashi Iwai877211f2005-11-17 13:59:38 +0100385 struct snd_pcm_substream *substream = entry->private_data;
Takashi Iwai901d46d2010-09-16 23:06:50 +0200386 struct snd_pcm_runtime *runtime;
387
388 mutex_lock(&substream->pcm->open_mutex);
389 runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 if (!runtime) {
391 snd_iprintf(buffer, "closed\n");
Takashi Iwai901d46d2010-09-16 23:06:50 +0200392 goto unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
395 snd_iprintf(buffer, "no setup\n");
Takashi Iwai901d46d2010-09-16 23:06:50 +0200396 goto unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 }
398 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
399 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
400 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
401 snd_iprintf(buffer, "channels: %u\n", runtime->channels);
402 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
403 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
404 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
Takashi Iwai8eeaa2f2014-02-10 09:48:47 +0100405#if IS_ENABLED(CONFIG_SND_PCM_OSS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 if (substream->oss.oss) {
407 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
408 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
409 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
410 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
411 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
412 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
413 }
414#endif
Takashi Iwai901d46d2010-09-16 23:06:50 +0200415 unlock:
416 mutex_unlock(&substream->pcm->open_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417}
418
Takashi Iwai877211f2005-11-17 13:59:38 +0100419static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
420 struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421{
Takashi Iwai877211f2005-11-17 13:59:38 +0100422 struct snd_pcm_substream *substream = entry->private_data;
Takashi Iwai901d46d2010-09-16 23:06:50 +0200423 struct snd_pcm_runtime *runtime;
424
425 mutex_lock(&substream->pcm->open_mutex);
426 runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 if (!runtime) {
428 snd_iprintf(buffer, "closed\n");
Takashi Iwai901d46d2010-09-16 23:06:50 +0200429 goto unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
432 snd_iprintf(buffer, "no setup\n");
Takashi Iwai901d46d2010-09-16 23:06:50 +0200433 goto unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 }
435 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
436 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
439 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
440 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
441 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
442 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
Takashi Iwai901d46d2010-09-16 23:06:50 +0200443 unlock:
444 mutex_unlock(&substream->pcm->open_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445}
446
Takashi Iwai877211f2005-11-17 13:59:38 +0100447static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
448 struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449{
Takashi Iwai877211f2005-11-17 13:59:38 +0100450 struct snd_pcm_substream *substream = entry->private_data;
Takashi Iwai901d46d2010-09-16 23:06:50 +0200451 struct snd_pcm_runtime *runtime;
Takashi Iwai877211f2005-11-17 13:59:38 +0100452 struct snd_pcm_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 int err;
Takashi Iwai901d46d2010-09-16 23:06:50 +0200454
455 mutex_lock(&substream->pcm->open_mutex);
456 runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 if (!runtime) {
458 snd_iprintf(buffer, "closed\n");
Takashi Iwai901d46d2010-09-16 23:06:50 +0200459 goto unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 }
461 memset(&status, 0, sizeof(status));
462 err = snd_pcm_status(substream, &status);
463 if (err < 0) {
464 snd_iprintf(buffer, "error %d\n", err);
Takashi Iwai901d46d2010-09-16 23:06:50 +0200465 goto unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 }
467 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
Clemens Ladische7373b72009-11-10 10:13:30 +0100468 snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
470 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
471 snd_iprintf(buffer, "tstamp : %ld.%09ld\n",
472 status.tstamp.tv_sec, status.tstamp.tv_nsec);
473 snd_iprintf(buffer, "delay : %ld\n", status.delay);
474 snd_iprintf(buffer, "avail : %ld\n", status.avail);
475 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
476 snd_iprintf(buffer, "-----\n");
477 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
478 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
Takashi Iwai901d46d2010-09-16 23:06:50 +0200479 unlock:
480 mutex_unlock(&substream->pcm->open_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482
Jaroslav Kysela61fb63c2006-04-24 21:57:16 +0200483#ifdef CONFIG_SND_PCM_XRUN_DEBUG
Takashi Iwai2b30d412014-11-04 14:02:40 +0100484static void snd_pcm_xrun_injection_write(struct snd_info_entry *entry,
485 struct snd_info_buffer *buffer)
486{
487 struct snd_pcm_substream *substream = entry->private_data;
488 struct snd_pcm_runtime *runtime;
489
490 snd_pcm_stream_lock_irq(substream);
491 runtime = substream->runtime;
492 if (runtime && runtime->status->state == SNDRV_PCM_STATE_RUNNING)
493 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
494 snd_pcm_stream_unlock_irq(substream);
495}
496
Takashi Iwai877211f2005-11-17 13:59:38 +0100497static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
498 struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499{
Takashi Iwai877211f2005-11-17 13:59:38 +0100500 struct snd_pcm_str *pstr = entry->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
502}
503
Takashi Iwai877211f2005-11-17 13:59:38 +0100504static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
505 struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506{
Takashi Iwai877211f2005-11-17 13:59:38 +0100507 struct snd_pcm_str *pstr = entry->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 char line[64];
509 if (!snd_info_get_line(buffer, line, sizeof(line)))
510 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
511}
512#endif
513
Takashi Iwai877211f2005-11-17 13:59:38 +0100514static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515{
Takashi Iwai877211f2005-11-17 13:59:38 +0100516 struct snd_pcm *pcm = pstr->pcm;
517 struct snd_info_entry *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 char name[16];
519
520 sprintf(name, "pcm%i%c", pcm->device,
521 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
522 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
523 return -ENOMEM;
524 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
525 if (snd_info_register(entry) < 0) {
526 snd_info_free_entry(entry);
527 return -ENOMEM;
528 }
529 pstr->proc_root = entry;
530
531 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
Takashi Iwaibf850202006-04-28 15:13:41 +0200532 snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 if (snd_info_register(entry) < 0) {
534 snd_info_free_entry(entry);
535 entry = NULL;
536 }
537 }
538 pstr->proc_info_entry = entry;
539
Jaroslav Kysela61fb63c2006-04-24 21:57:16 +0200540#ifdef CONFIG_SND_PCM_XRUN_DEBUG
Takashi Iwai877211f2005-11-17 13:59:38 +0100541 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
542 pstr->proc_root)) != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 entry->c.text.read = snd_pcm_xrun_debug_read;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 entry->c.text.write = snd_pcm_xrun_debug_write;
Takashi Iwaibd7bf042005-04-12 16:27:28 +0200545 entry->mode |= S_IWUSR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 entry->private_data = pstr;
547 if (snd_info_register(entry) < 0) {
548 snd_info_free_entry(entry);
549 entry = NULL;
550 }
551 }
552 pstr->proc_xrun_debug_entry = entry;
553#endif
554 return 0;
555}
556
Takashi Iwai877211f2005-11-17 13:59:38 +0100557static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558{
Jaroslav Kysela61fb63c2006-04-24 21:57:16 +0200559#ifdef CONFIG_SND_PCM_XRUN_DEBUG
Takashi Iwai746d4a02006-06-23 14:37:59 +0200560 snd_info_free_entry(pstr->proc_xrun_debug_entry);
561 pstr->proc_xrun_debug_entry = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562#endif
Takashi Iwai746d4a02006-06-23 14:37:59 +0200563 snd_info_free_entry(pstr->proc_info_entry);
564 pstr->proc_info_entry = NULL;
565 snd_info_free_entry(pstr->proc_root);
566 pstr->proc_root = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 return 0;
568}
569
Takashi Iwai877211f2005-11-17 13:59:38 +0100570static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571{
Takashi Iwai877211f2005-11-17 13:59:38 +0100572 struct snd_info_entry *entry;
573 struct snd_card *card;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 char name[16];
575
576 card = substream->pcm->card;
577
578 sprintf(name, "sub%i", substream->number);
579 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
580 return -ENOMEM;
581 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
582 if (snd_info_register(entry) < 0) {
583 snd_info_free_entry(entry);
584 return -ENOMEM;
585 }
586 substream->proc_root = entry;
587
588 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
Takashi Iwaibf850202006-04-28 15:13:41 +0200589 snd_info_set_text_ops(entry, substream,
590 snd_pcm_substream_proc_info_read);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 if (snd_info_register(entry) < 0) {
592 snd_info_free_entry(entry);
593 entry = NULL;
594 }
595 }
596 substream->proc_info_entry = entry;
597
598 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
Takashi Iwaibf850202006-04-28 15:13:41 +0200599 snd_info_set_text_ops(entry, substream,
600 snd_pcm_substream_proc_hw_params_read);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 if (snd_info_register(entry) < 0) {
602 snd_info_free_entry(entry);
603 entry = NULL;
604 }
605 }
606 substream->proc_hw_params_entry = entry;
607
608 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
Takashi Iwaibf850202006-04-28 15:13:41 +0200609 snd_info_set_text_ops(entry, substream,
610 snd_pcm_substream_proc_sw_params_read);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611 if (snd_info_register(entry) < 0) {
612 snd_info_free_entry(entry);
613 entry = NULL;
614 }
615 }
616 substream->proc_sw_params_entry = entry;
617
618 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
Takashi Iwaibf850202006-04-28 15:13:41 +0200619 snd_info_set_text_ops(entry, substream,
620 snd_pcm_substream_proc_status_read);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 if (snd_info_register(entry) < 0) {
622 snd_info_free_entry(entry);
623 entry = NULL;
624 }
625 }
626 substream->proc_status_entry = entry;
627
Takashi Iwai2b30d412014-11-04 14:02:40 +0100628#ifdef CONFIG_SND_PCM_XRUN_DEBUG
629 entry = snd_info_create_card_entry(card, "xrun_injection",
630 substream->proc_root);
631 if (entry) {
632 entry->private_data = substream;
633 entry->c.text.read = NULL;
634 entry->c.text.write = snd_pcm_xrun_injection_write;
635 entry->mode = S_IFREG | S_IWUSR;
636 if (snd_info_register(entry) < 0) {
637 snd_info_free_entry(entry);
638 entry = NULL;
639 }
640 }
641 substream->proc_xrun_injection_entry = entry;
642#endif /* CONFIG_SND_PCM_XRUN_DEBUG */
643
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 return 0;
645}
Takashi Iwai746d4a02006-06-23 14:37:59 +0200646
Takashi Iwai877211f2005-11-17 13:59:38 +0100647static int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648{
Takashi Iwai746d4a02006-06-23 14:37:59 +0200649 snd_info_free_entry(substream->proc_info_entry);
650 substream->proc_info_entry = NULL;
651 snd_info_free_entry(substream->proc_hw_params_entry);
652 substream->proc_hw_params_entry = NULL;
653 snd_info_free_entry(substream->proc_sw_params_entry);
654 substream->proc_sw_params_entry = NULL;
655 snd_info_free_entry(substream->proc_status_entry);
656 substream->proc_status_entry = NULL;
Takashi Iwai2b30d412014-11-04 14:02:40 +0100657#ifdef CONFIG_SND_PCM_XRUN_DEBUG
658 snd_info_free_entry(substream->proc_xrun_injection_entry);
659 substream->proc_xrun_injection_entry = NULL;
660#endif
Takashi Iwai746d4a02006-06-23 14:37:59 +0200661 snd_info_free_entry(substream->proc_root);
662 substream->proc_root = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663 return 0;
664}
Takashi Iwaib7d90a32006-04-25 12:56:04 +0200665#else /* !CONFIG_SND_VERBOSE_PROCFS */
Takashi Iwaie28563c2005-12-01 10:42:42 +0100666static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
667static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
668static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
669static inline int snd_pcm_substream_proc_done(struct snd_pcm_substream *substream) { return 0; }
Takashi Iwaib7d90a32006-04-25 12:56:04 +0200670#endif /* CONFIG_SND_VERBOSE_PROCFS */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671
Takashi Iwaief46c7a2015-01-29 17:32:26 +0100672static const struct attribute_group *pcm_dev_attr_groups[];
673
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674/**
675 * snd_pcm_new_stream - create a new PCM stream
676 * @pcm: the pcm instance
677 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
678 * @substream_count: the number of substreams
679 *
680 * Creates a new stream for the pcm.
681 * The corresponding stream on the pcm must have been empty before
682 * calling this, i.e. zero must be given to the argument of
683 * snd_pcm_new().
684 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100685 * Return: Zero if successful, or a negative error code on failure.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686 */
Takashi Iwai877211f2005-11-17 13:59:38 +0100687int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688{
689 int idx, err;
Takashi Iwai877211f2005-11-17 13:59:38 +0100690 struct snd_pcm_str *pstr = &pcm->streams[stream];
691 struct snd_pcm_substream *substream, *prev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692
Takashi Iwai8eeaa2f2014-02-10 09:48:47 +0100693#if IS_ENABLED(CONFIG_SND_PCM_OSS)
Ingo Molnar1a60d4c2006-01-16 16:29:08 +0100694 mutex_init(&pstr->oss.setup_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695#endif
696 pstr->stream = stream;
697 pstr->pcm = pcm;
698 pstr->substream_count = substream_count;
Takashi Iwaief46c7a2015-01-29 17:32:26 +0100699 if (!substream_count)
700 return 0;
701
702 snd_device_initialize(&pstr->dev, pcm->card);
703 pstr->dev.groups = pcm_dev_attr_groups;
704 dev_set_name(&pstr->dev, "pcmC%iD%i%c", pcm->card->number, pcm->device,
705 stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
706
707 if (!pcm->internal) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 err = snd_pcm_stream_proc_init(pstr);
Takashi Iwai73e77ba2005-11-17 17:44:01 +0100709 if (err < 0) {
Takashi Iwai09e56df2014-02-04 18:19:48 +0100710 pcm_err(pcm, "Error in snd_pcm_stream_proc_init\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711 return err;
Takashi Iwai73e77ba2005-11-17 17:44:01 +0100712 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 }
714 prev = NULL;
715 for (idx = 0, prev = NULL; idx < substream_count; idx++) {
Takashi Iwaica2c0962005-09-09 14:20:23 +0200716 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
Takashi Iwaiec0e9932015-03-10 15:42:14 +0100717 if (!substream)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 return -ENOMEM;
719 substream->pcm = pcm;
720 substream->pstr = pstr;
721 substream->number = idx;
722 substream->stream = stream;
723 sprintf(substream->name, "subdevice #%i", idx);
724 substream->buffer_bytes_max = UINT_MAX;
725 if (prev == NULL)
726 pstr->substream = substream;
727 else
728 prev->next = substream;
Liam Girdwood945e5032012-02-08 20:33:31 +0000729
730 if (!pcm->internal) {
731 err = snd_pcm_substream_proc_init(substream);
732 if (err < 0) {
Takashi Iwai09e56df2014-02-04 18:19:48 +0100733 pcm_err(pcm,
734 "Error in snd_pcm_stream_proc_init\n");
Liam Girdwood945e5032012-02-08 20:33:31 +0000735 if (prev == NULL)
736 pstr->substream = NULL;
737 else
738 prev->next = NULL;
739 kfree(substream);
740 return err;
741 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 }
743 substream->group = &substream->self_group;
744 spin_lock_init(&substream->self_group.lock);
Takashi Iwai257f8cc2014-08-29 15:32:29 +0200745 mutex_init(&substream->self_group.mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 INIT_LIST_HEAD(&substream->self_group.substreams);
747 list_add_tail(&substream->link_list, &substream->self_group.substreams);
Takashi Iwai9c323fc2006-04-28 15:13:41 +0200748 atomic_set(&substream->mmap_count, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 prev = substream;
750 }
751 return 0;
752}
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200753EXPORT_SYMBOL(snd_pcm_new_stream);
754
Liam Girdwood945e5032012-02-08 20:33:31 +0000755static int _snd_pcm_new(struct snd_card *card, const char *id, int device,
756 int playback_count, int capture_count, bool internal,
757 struct snd_pcm **rpcm)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758{
Takashi Iwai877211f2005-11-17 13:59:38 +0100759 struct snd_pcm *pcm;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 int err;
Takashi Iwai877211f2005-11-17 13:59:38 +0100761 static struct snd_device_ops ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762 .dev_free = snd_pcm_dev_free,
763 .dev_register = snd_pcm_dev_register,
764 .dev_disconnect = snd_pcm_dev_disconnect,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765 };
766
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200767 if (snd_BUG_ON(!card))
768 return -ENXIO;
769 if (rpcm)
770 *rpcm = NULL;
Takashi Iwaica2c0962005-09-09 14:20:23 +0200771 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
Takashi Iwaiec0e9932015-03-10 15:42:14 +0100772 if (!pcm)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 return -ENOMEM;
774 pcm->card = card;
775 pcm->device = device;
Liam Girdwood945e5032012-02-08 20:33:31 +0000776 pcm->internal = internal;
Takashi Iwaib95bd3a2015-02-20 16:49:04 +0100777 mutex_init(&pcm->open_mutex);
778 init_waitqueue_head(&pcm->open_wait);
779 INIT_LIST_HEAD(&pcm->list);
Takashi Iwai73e77ba2005-11-17 17:44:01 +0100780 if (id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781 strlcpy(pcm->id, id, sizeof(pcm->id));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
783 snd_pcm_free(pcm);
784 return err;
785 }
786 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
787 snd_pcm_free(pcm);
788 return err;
789 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
791 snd_pcm_free(pcm);
792 return err;
793 }
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200794 if (rpcm)
795 *rpcm = pcm;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796 return 0;
797}
798
Liam Girdwood945e5032012-02-08 20:33:31 +0000799/**
800 * snd_pcm_new - create a new PCM instance
801 * @card: the card instance
802 * @id: the id string
803 * @device: the device index (zero based)
804 * @playback_count: the number of substreams for playback
805 * @capture_count: the number of substreams for capture
806 * @rpcm: the pointer to store the new pcm instance
807 *
808 * Creates a new PCM instance.
809 *
810 * The pcm operators have to be set afterwards to the new instance
811 * via snd_pcm_set_ops().
812 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100813 * Return: Zero if successful, or a negative error code on failure.
Liam Girdwood945e5032012-02-08 20:33:31 +0000814 */
815int snd_pcm_new(struct snd_card *card, const char *id, int device,
816 int playback_count, int capture_count, struct snd_pcm **rpcm)
817{
818 return _snd_pcm_new(card, id, device, playback_count, capture_count,
819 false, rpcm);
820}
Takashi Iwaie88e8ae62006-04-28 15:13:40 +0200821EXPORT_SYMBOL(snd_pcm_new);
822
Liam Girdwood945e5032012-02-08 20:33:31 +0000823/**
824 * snd_pcm_new_internal - create a new internal PCM instance
825 * @card: the card instance
826 * @id: the id string
827 * @device: the device index (zero based - shared with normal PCMs)
828 * @playback_count: the number of substreams for playback
829 * @capture_count: the number of substreams for capture
830 * @rpcm: the pointer to store the new pcm instance
831 *
832 * Creates a new internal PCM instance with no userspace device or procfs
833 * entries. This is used by ASoC Back End PCMs in order to create a PCM that
834 * will only be used internally by kernel drivers. i.e. it cannot be opened
835 * by userspace. It provides existing ASoC components drivers with a substream
836 * and access to any private data.
837 *
838 * The pcm operators have to be set afterwards to the new instance
839 * via snd_pcm_set_ops().
840 *
Yacine Belkadieb7c06e2013-03-11 22:05:14 +0100841 * Return: Zero if successful, or a negative error code on failure.
Liam Girdwood945e5032012-02-08 20:33:31 +0000842 */
843int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
844 int playback_count, int capture_count,
845 struct snd_pcm **rpcm)
846{
847 return _snd_pcm_new(card, id, device, playback_count, capture_count,
848 true, rpcm);
849}
850EXPORT_SYMBOL(snd_pcm_new_internal);
851
Takashi Iwai877211f2005-11-17 13:59:38 +0100852static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853{
Takashi Iwai877211f2005-11-17 13:59:38 +0100854 struct snd_pcm_substream *substream, *substream_next;
Takashi Iwai8eeaa2f2014-02-10 09:48:47 +0100855#if IS_ENABLED(CONFIG_SND_PCM_OSS)
Takashi Iwai877211f2005-11-17 13:59:38 +0100856 struct snd_pcm_oss_setup *setup, *setupn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857#endif
858 substream = pstr->substream;
859 while (substream) {
860 substream_next = substream->next;
Takashi Iwaic4614822006-06-23 14:38:23 +0200861 snd_pcm_timer_done(substream);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862 snd_pcm_substream_proc_done(substream);
863 kfree(substream);
864 substream = substream_next;
865 }
866 snd_pcm_stream_proc_done(pstr);
Takashi Iwai8eeaa2f2014-02-10 09:48:47 +0100867#if IS_ENABLED(CONFIG_SND_PCM_OSS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
869 setupn = setup->next;
870 kfree(setup->task_name);
871 kfree(setup);
872 }
873#endif
Takashi Iwaief46c7a2015-01-29 17:32:26 +0100874 if (pstr->substream_count)
875 put_device(&pstr->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876}
877
Takashi Iwai877211f2005-11-17 13:59:38 +0100878static int snd_pcm_free(struct snd_pcm *pcm)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879{
Takashi Iwaic4614822006-06-23 14:38:23 +0200880 struct snd_pcm_notify *notify;
881
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200882 if (!pcm)
883 return 0;
Takashi Iwai646e1dd2015-02-20 17:04:08 +0100884 if (!pcm->internal) {
885 list_for_each_entry(notify, &snd_pcm_notify_list, list)
886 notify->n_unregister(pcm);
Takashi Iwaic4614822006-06-23 14:38:23 +0200887 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888 if (pcm->private_free)
889 pcm->private_free(pcm);
890 snd_pcm_lib_preallocate_free_for_all(pcm);
891 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
892 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
893 kfree(pcm);
894 return 0;
895}
896
Takashi Iwai877211f2005-11-17 13:59:38 +0100897static int snd_pcm_dev_free(struct snd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898{
Takashi Iwai877211f2005-11-17 13:59:38 +0100899 struct snd_pcm *pcm = device->device_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900 return snd_pcm_free(pcm);
901}
902
Takashi Iwai3bf75f92006-03-27 16:40:49 +0200903int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
904 struct file *file,
905 struct snd_pcm_substream **rsubstream)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906{
Takashi Iwai877211f2005-11-17 13:59:38 +0100907 struct snd_pcm_str * pstr;
908 struct snd_pcm_substream *substream;
909 struct snd_pcm_runtime *runtime;
Takashi Iwai877211f2005-11-17 13:59:38 +0100910 struct snd_card *card;
Takashi Iwai23c18d42014-02-19 14:30:29 +0100911 int prefer_subdevice;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912 size_t size;
913
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200914 if (snd_BUG_ON(!pcm || !rsubstream))
915 return -ENXIO;
Takashi Iwaiad876c82015-02-20 16:26:00 +0100916 if (snd_BUG_ON(stream != SNDRV_PCM_STREAM_PLAYBACK &&
917 stream != SNDRV_PCM_STREAM_CAPTURE))
918 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919 *rsubstream = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920 pstr = &pcm->streams[stream];
Takashi Iwai3bf75f92006-03-27 16:40:49 +0200921 if (pstr->substream == NULL || pstr->substream_count == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922 return -ENODEV;
923
924 card = pcm->card;
Takashi Iwai23c18d42014-02-19 14:30:29 +0100925 prefer_subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_PCM);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926
Takashi Iwaiad876c82015-02-20 16:26:00 +0100927 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
928 int opposite = !stream;
929
930 for (substream = pcm->streams[opposite].substream; substream;
931 substream = substream->next) {
932 if (SUBSTREAM_BUSY(substream))
933 return -EAGAIN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935 }
936
Takashi Iwai0df63e42006-04-28 15:13:41 +0200937 if (file->f_flags & O_APPEND) {
938 if (prefer_subdevice < 0) {
939 if (pstr->substream_count > 1)
940 return -EINVAL; /* must be unique */
941 substream = pstr->substream;
942 } else {
943 for (substream = pstr->substream; substream;
944 substream = substream->next)
945 if (substream->number == prefer_subdevice)
946 break;
947 }
948 if (! substream)
949 return -ENODEV;
950 if (! SUBSTREAM_BUSY(substream))
951 return -EBADFD;
952 substream->ref_count++;
953 *rsubstream = substream;
954 return 0;
955 }
956
Takashi Iwaiad876c82015-02-20 16:26:00 +0100957 for (substream = pstr->substream; substream; substream = substream->next) {
958 if (!SUBSTREAM_BUSY(substream) &&
959 (prefer_subdevice == -1 ||
960 substream->number == prefer_subdevice))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961 break;
Takashi Iwaiad876c82015-02-20 16:26:00 +0100962 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963 if (substream == NULL)
964 return -EAGAIN;
965
Takashi Iwaica2c0962005-09-09 14:20:23 +0200966 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967 if (runtime == NULL)
968 return -ENOMEM;
969
Takashi Iwai877211f2005-11-17 13:59:38 +0100970 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971 runtime->status = snd_malloc_pages(size, GFP_KERNEL);
972 if (runtime->status == NULL) {
973 kfree(runtime);
974 return -ENOMEM;
975 }
976 memset((void*)runtime->status, 0, size);
977
Takashi Iwai877211f2005-11-17 13:59:38 +0100978 size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979 runtime->control = snd_malloc_pages(size, GFP_KERNEL);
980 if (runtime->control == NULL) {
Takashi Iwai877211f2005-11-17 13:59:38 +0100981 snd_free_pages((void*)runtime->status,
982 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983 kfree(runtime);
984 return -ENOMEM;
985 }
986 memset((void*)runtime->control, 0, size);
987
988 init_waitqueue_head(&runtime->sleep);
Jaroslav Kyselac91a9882010-01-21 10:32:15 +0100989 init_waitqueue_head(&runtime->tsleep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990
991 runtime->status->state = SNDRV_PCM_STATE_OPEN;
992
993 substream->runtime = runtime;
994 substream->private_data = pcm->private_data;
Takashi Iwai0df63e42006-04-28 15:13:41 +0200995 substream->ref_count = 1;
996 substream->f_flags = file->f_flags;
Clemens Ladische7373b72009-11-10 10:13:30 +0100997 substream->pid = get_pid(task_pid(current));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998 pstr->substream_opened++;
999 *rsubstream = substream;
1000 return 0;
1001}
1002
Takashi Iwai3bf75f92006-03-27 16:40:49 +02001003void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004{
Takashi Iwai877211f2005-11-17 13:59:38 +01001005 struct snd_pcm_runtime *runtime;
Takashi Iwai0df63e42006-04-28 15:13:41 +02001006
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001007 if (PCM_RUNTIME_CHECK(substream))
1008 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009 runtime = substream->runtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010 if (runtime->private_free != NULL)
1011 runtime->private_free(runtime);
Takashi Iwai877211f2005-11-17 13:59:38 +01001012 snd_free_pages((void*)runtime->status,
1013 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
1014 snd_free_pages((void*)runtime->control,
1015 PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016 kfree(runtime->hw_constraints.rules);
1017 kfree(runtime);
1018 substream->runtime = NULL;
Clemens Ladische7373b72009-11-10 10:13:30 +01001019 put_pid(substream->pid);
1020 substream->pid = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021 substream->pstr->substream_opened--;
1022}
1023
Greg Kroah-Hartmand80f19f2006-08-07 22:19:37 -07001024static ssize_t show_pcm_class(struct device *dev,
1025 struct device_attribute *attr, char *buf)
Takashi Iwai9d19f482006-09-06 14:27:46 +02001026{
Takashi Iwai60b93032015-06-23 11:56:22 +02001027 struct snd_pcm_str *pstr = container_of(dev, struct snd_pcm_str, dev);
1028 struct snd_pcm *pcm = pstr->pcm;
Takashi Iwai9d19f482006-09-06 14:27:46 +02001029 const char *str;
1030 static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
1031 [SNDRV_PCM_CLASS_GENERIC] = "generic",
1032 [SNDRV_PCM_CLASS_MULTI] = "multi",
1033 [SNDRV_PCM_CLASS_MODEM] = "modem",
1034 [SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
1035 };
1036
Takashi Iwai60b93032015-06-23 11:56:22 +02001037 if (pcm->dev_class > SNDRV_PCM_CLASS_LAST)
Takashi Iwai9d19f482006-09-06 14:27:46 +02001038 str = "none";
1039 else
1040 str = strs[pcm->dev_class];
1041 return snprintf(buf, PAGE_SIZE, "%s\n", str);
1042}
1043
Takashi Iwaicaa751b2014-02-25 08:30:50 +01001044static DEVICE_ATTR(pcm_class, S_IRUGO, show_pcm_class, NULL);
1045static struct attribute *pcm_dev_attrs[] = {
1046 &dev_attr_pcm_class.attr,
1047 NULL
1048};
1049
1050static struct attribute_group pcm_dev_attr_group = {
1051 .attrs = pcm_dev_attrs,
1052};
1053
1054static const struct attribute_group *pcm_dev_attr_groups[] = {
1055 &pcm_dev_attr_group,
1056 NULL
1057};
Takashi Iwai9d19f482006-09-06 14:27:46 +02001058
Takashi Iwai877211f2005-11-17 13:59:38 +01001059static int snd_pcm_dev_register(struct snd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060{
Clemens Ladischf87135f2005-11-20 14:06:59 +01001061 int cidx, err;
Takashi Iwai877211f2005-11-17 13:59:38 +01001062 struct snd_pcm_substream *substream;
Johannes Berg9244b2c2006-10-05 16:02:22 +02001063 struct snd_pcm_notify *notify;
Julia Lawall4b3be6a2009-10-17 08:33:22 +02001064 struct snd_pcm *pcm;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065
Julia Lawall4b3be6a2009-10-17 08:33:22 +02001066 if (snd_BUG_ON(!device || !device->device_data))
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001067 return -ENXIO;
Julia Lawall4b3be6a2009-10-17 08:33:22 +02001068 pcm = device->device_data;
Takashi Iwaib95bd3a2015-02-20 16:49:04 +01001069 if (pcm->internal)
1070 return 0;
1071
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001072 mutex_lock(&register_mutex);
Pawel MOLLf90c06a2008-07-30 12:46:40 +01001073 err = snd_pcm_add(pcm);
Takashi Iwaib95bd3a2015-02-20 16:49:04 +01001074 if (err)
1075 goto unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076 for (cidx = 0; cidx < 2; cidx++) {
1077 int devtype = -1;
Takashi Iwaib95bd3a2015-02-20 16:49:04 +01001078 if (pcm->streams[cidx].substream == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079 continue;
1080 switch (cidx) {
1081 case SNDRV_PCM_STREAM_PLAYBACK:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
1083 break;
1084 case SNDRV_PCM_STREAM_CAPTURE:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
1086 break;
1087 }
Johannes Bergc78085f2006-10-05 15:06:34 +02001088 /* register pcm */
Takashi Iwai40a4b262015-01-30 08:34:58 +01001089 err = snd_register_device(devtype, pcm->card, pcm->device,
1090 &snd_pcm_f_ops[cidx], pcm,
1091 &pcm->streams[cidx].dev);
Johannes Bergc78085f2006-10-05 15:06:34 +02001092 if (err < 0) {
Takashi Iwaib95bd3a2015-02-20 16:49:04 +01001093 list_del_init(&pcm->list);
1094 goto unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095 }
Takashi Iwaicaa751b2014-02-25 08:30:50 +01001096
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
1098 snd_pcm_timer_init(substream);
1099 }
Johannes Berg9244b2c2006-10-05 16:02:22 +02001100
1101 list_for_each_entry(notify, &snd_pcm_notify_list, list)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102 notify->n_register(pcm);
Johannes Berg9244b2c2006-10-05 16:02:22 +02001103
Takashi Iwaib95bd3a2015-02-20 16:49:04 +01001104 unlock:
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001105 mutex_unlock(&register_mutex);
Takashi Iwaib95bd3a2015-02-20 16:49:04 +01001106 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107}
1108
Takashi Iwai877211f2005-11-17 13:59:38 +01001109static int snd_pcm_dev_disconnect(struct snd_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110{
Takashi Iwai877211f2005-11-17 13:59:38 +01001111 struct snd_pcm *pcm = device->device_data;
Takashi Iwaic4614822006-06-23 14:38:23 +02001112 struct snd_pcm_notify *notify;
Takashi Iwai877211f2005-11-17 13:59:38 +01001113 struct snd_pcm_substream *substream;
Takashi Iwai40a4b262015-01-30 08:34:58 +01001114 int cidx;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001116 mutex_lock(&register_mutex);
Takashi Iwai9b0573c2012-10-12 15:07:34 +02001117 mutex_lock(&pcm->open_mutex);
Takashi Iwai0914f792012-10-16 16:43:39 +02001118 wake_up(&pcm->open_wait);
Clemens Ladischf87135f2005-11-20 14:06:59 +01001119 list_del_init(&pcm->list);
Takashi Iwai646e1dd2015-02-20 17:04:08 +01001120 for (cidx = 0; cidx < 2; cidx++) {
Takashi Iwai9b0573c2012-10-12 15:07:34 +02001121 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) {
1122 snd_pcm_stream_lock_irq(substream);
Takashi Iwai0914f792012-10-16 16:43:39 +02001123 if (substream->runtime) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
Takashi Iwai0914f792012-10-16 16:43:39 +02001125 wake_up(&substream->runtime->sleep);
1126 wake_up(&substream->runtime->tsleep);
1127 }
Takashi Iwai9b0573c2012-10-12 15:07:34 +02001128 snd_pcm_stream_unlock_irq(substream);
1129 }
Takashi Iwai646e1dd2015-02-20 17:04:08 +01001130 }
1131 if (!pcm->internal) {
1132 list_for_each_entry(notify, &snd_pcm_notify_list, list)
1133 notify->n_disconnect(pcm);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135 for (cidx = 0; cidx < 2; cidx++) {
Takashi Iwaib2022132015-02-20 17:05:27 +01001136 if (!pcm->internal)
1137 snd_unregister_device(&pcm->streams[cidx].dev);
Takashi Iwai2d3391e2012-07-27 18:27:00 +02001138 if (pcm->streams[cidx].chmap_kctl) {
1139 snd_ctl_remove(pcm->card, pcm->streams[cidx].chmap_kctl);
1140 pcm->streams[cidx].chmap_kctl = NULL;
1141 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142 }
Takashi Iwai9b0573c2012-10-12 15:07:34 +02001143 mutex_unlock(&pcm->open_mutex);
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001144 mutex_unlock(&register_mutex);
Takashi Iwaic4614822006-06-23 14:38:23 +02001145 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146}
1147
Takashi Iwai30b771c2014-10-30 15:02:50 +01001148/**
1149 * snd_pcm_notify - Add/remove the notify list
1150 * @notify: PCM notify list
1151 * @nfree: 0 = register, 1 = unregister
1152 *
1153 * This adds the given notifier to the global list so that the callback is
1154 * called for each registered PCM devices. This exists only for PCM OSS
1155 * emulation, so far.
1156 */
Takashi Iwai877211f2005-11-17 13:59:38 +01001157int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158{
Johannes Berg9244b2c2006-10-05 16:02:22 +02001159 struct snd_pcm *pcm;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001160
Takashi Iwai7eaa9432008-08-08 17:09:09 +02001161 if (snd_BUG_ON(!notify ||
1162 !notify->n_register ||
1163 !notify->n_unregister ||
1164 !notify->n_disconnect))
1165 return -EINVAL;
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001166 mutex_lock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167 if (nfree) {
1168 list_del(&notify->list);
Johannes Berg9244b2c2006-10-05 16:02:22 +02001169 list_for_each_entry(pcm, &snd_pcm_devices, list)
1170 notify->n_unregister(pcm);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171 } else {
1172 list_add_tail(&notify->list, &snd_pcm_notify_list);
Johannes Berg9244b2c2006-10-05 16:02:22 +02001173 list_for_each_entry(pcm, &snd_pcm_devices, list)
1174 notify->n_register(pcm);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175 }
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001176 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177 return 0;
1178}
Takashi Iwaie88e8ae62006-04-28 15:13:40 +02001179EXPORT_SYMBOL(snd_pcm_notify);
1180
Jie Yangcd6a6502015-05-27 19:45:45 +08001181#ifdef CONFIG_SND_PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182/*
1183 * Info interface
1184 */
1185
Takashi Iwai877211f2005-11-17 13:59:38 +01001186static void snd_pcm_proc_read(struct snd_info_entry *entry,
1187 struct snd_info_buffer *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188{
Takashi Iwai877211f2005-11-17 13:59:38 +01001189 struct snd_pcm *pcm;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001191 mutex_lock(&register_mutex);
Johannes Berg9244b2c2006-10-05 16:02:22 +02001192 list_for_each_entry(pcm, &snd_pcm_devices, list) {
Clemens Ladischf87135f2005-11-20 14:06:59 +01001193 snd_iprintf(buffer, "%02i-%02i: %s : %s",
1194 pcm->card->number, pcm->device, pcm->id, pcm->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
Takashi Iwai877211f2005-11-17 13:59:38 +01001196 snd_iprintf(buffer, " : playback %i",
1197 pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
Takashi Iwai877211f2005-11-17 13:59:38 +01001199 snd_iprintf(buffer, " : capture %i",
1200 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201 snd_iprintf(buffer, "\n");
1202 }
Ingo Molnar1a60d4c2006-01-16 16:29:08 +01001203 mutex_unlock(&register_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001204}
1205
Takashi Iwai6581f4e2006-05-17 17:14:51 +02001206static struct snd_info_entry *snd_pcm_proc_entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207
Takashi Iwaie28563c2005-12-01 10:42:42 +01001208static void snd_pcm_proc_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209{
Takashi Iwai877211f2005-11-17 13:59:38 +01001210 struct snd_info_entry *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
Takashi Iwaibf850202006-04-28 15:13:41 +02001213 snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214 if (snd_info_register(entry) < 0) {
1215 snd_info_free_entry(entry);
1216 entry = NULL;
1217 }
1218 }
1219 snd_pcm_proc_entry = entry;
Takashi Iwaie28563c2005-12-01 10:42:42 +01001220}
1221
1222static void snd_pcm_proc_done(void)
1223{
Takashi Iwai746d4a02006-06-23 14:37:59 +02001224 snd_info_free_entry(snd_pcm_proc_entry);
Takashi Iwaie28563c2005-12-01 10:42:42 +01001225}
1226
Jie Yangcd6a6502015-05-27 19:45:45 +08001227#else /* !CONFIG_SND_PROC_FS */
Takashi Iwaie28563c2005-12-01 10:42:42 +01001228#define snd_pcm_proc_init()
1229#define snd_pcm_proc_done()
Jie Yangcd6a6502015-05-27 19:45:45 +08001230#endif /* CONFIG_SND_PROC_FS */
Takashi Iwaie28563c2005-12-01 10:42:42 +01001231
1232
1233/*
1234 * ENTRY functions
1235 */
1236
1237static int __init alsa_pcm_init(void)
1238{
1239 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1240 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1241 snd_pcm_proc_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001242 return 0;
1243}
1244
1245static void __exit alsa_pcm_exit(void)
1246{
1247 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1248 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
Takashi Iwaie28563c2005-12-01 10:42:42 +01001249 snd_pcm_proc_done();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250}
1251
1252module_init(alsa_pcm_init)
1253module_exit(alsa_pcm_exit)