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[IPV4]: Fix secondary IP addresses after promotion
[linux/fpc-iii.git] / sound / core / pcm.c
blob184e74b75ba96f78c523d3464960c42cf09396b9
1 /*
2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@suse.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22 #include <sound/driver.h>
23 #include <linux/init.h>
24 #include <linux/slab.h>
25 #include <linux/time.h>
26 #include <sound/core.h>
27 #include <sound/minors.h>
28 #include <sound/pcm.h>
29 #include <sound/control.h>
30 #include <sound/info.h>
31
32 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Abramo Bagnara <abramo@alsa-project.org>");
33 MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
34 MODULE_LICENSE("GPL");
35
36 snd_pcm_t *snd_pcm_devices[SNDRV_CARDS * SNDRV_PCM_DEVICES];
37 static LIST_HEAD(snd_pcm_notify_list);
38 static DECLARE_MUTEX(register_mutex);
39
40 static int snd_pcm_free(snd_pcm_t *pcm);
41 static int snd_pcm_dev_free(snd_device_t *device);
42 static int snd_pcm_dev_register(snd_device_t *device);
43 static int snd_pcm_dev_disconnect(snd_device_t *device);
44 static int snd_pcm_dev_unregister(snd_device_t *device);
45
46 static int snd_pcm_control_ioctl(snd_card_t * card,
47 snd_ctl_file_t * control,
48 unsigned int cmd, unsigned long arg)
49 {
50 unsigned int tmp;
51
52 tmp = card->number * SNDRV_PCM_DEVICES;
53 switch (cmd) {
54 case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
55 {
56 int device;
57
58 if (get_user(device, (int __user *)arg))
59 return -EFAULT;
60 device = device < 0 ? 0 : device + 1;
61 while (device < SNDRV_PCM_DEVICES) {
62 if (snd_pcm_devices[tmp + device])
63 break;
64 device++;
65 }
66 if (device == SNDRV_PCM_DEVICES)
67 device = -1;
68 if (put_user(device, (int __user *)arg))
69 return -EFAULT;
70 return 0;
71 }
72 case SNDRV_CTL_IOCTL_PCM_INFO:
73 {
74 snd_pcm_info_t __user *info;
75 unsigned int device, subdevice;
76 snd_pcm_stream_t stream;
77 snd_pcm_t *pcm;
78 snd_pcm_str_t *pstr;
79 snd_pcm_substream_t *substream;
80 info = (snd_pcm_info_t __user *)arg;
81 if (get_user(device, &info->device))
82 return -EFAULT;
83 if (device >= SNDRV_PCM_DEVICES)
84 return -ENXIO;
85 pcm = snd_pcm_devices[tmp + device];
86 if (pcm == NULL)
87 return -ENXIO;
88 if (get_user(stream, &info->stream))
89 return -EFAULT;
90 if (stream < 0 || stream > 1)
91 return -EINVAL;
92 pstr = &pcm->streams[stream];
93 if (pstr->substream_count == 0)
94 return -ENOENT;
95 if (get_user(subdevice, &info->subdevice))
96 return -EFAULT;
97 if (subdevice >= pstr->substream_count)
98 return -ENXIO;
99 for (substream = pstr->substream; substream; substream = substream->next)
100 if (substream->number == (int)subdevice)
101 break;
102 if (substream == NULL)
103 return -ENXIO;
104 return snd_pcm_info_user(substream, info);
105 }
106 case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
107 {
108 int val;
109
110 if (get_user(val, (int __user *)arg))
111 return -EFAULT;
112 control->prefer_pcm_subdevice = val;
113 return 0;
114 }
115 }
116 return -ENOIOCTLCMD;
117 }
118 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
119 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
120 #define READY(v) [SNDRV_PCM_READY_##v] = #v
121 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
122 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
123 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
124 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
125 #define START(v) [SNDRV_PCM_START_##v] = #v
126 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
127 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
128
129 static char *snd_pcm_stream_names[] = {
130 STREAM(PLAYBACK),
131 STREAM(CAPTURE),
132 };
133
134 static char *snd_pcm_state_names[] = {
135 STATE(OPEN),
136 STATE(SETUP),
137 STATE(PREPARED),
138 STATE(RUNNING),
139 STATE(XRUN),
140 STATE(DRAINING),
141 STATE(PAUSED),
142 STATE(SUSPENDED),
143 };
144
145 static char *snd_pcm_access_names[] = {
146 ACCESS(MMAP_INTERLEAVED),
147 ACCESS(MMAP_NONINTERLEAVED),
148 ACCESS(MMAP_COMPLEX),
149 ACCESS(RW_INTERLEAVED),
150 ACCESS(RW_NONINTERLEAVED),
151 };
152
153 static char *snd_pcm_format_names[] = {
154 FORMAT(S8),
155 FORMAT(U8),
156 FORMAT(S16_LE),
157 FORMAT(S16_BE),
158 FORMAT(U16_LE),
159 FORMAT(U16_BE),
160 FORMAT(S24_LE),
161 FORMAT(S24_BE),
162 FORMAT(U24_LE),
163 FORMAT(U24_BE),
164 FORMAT(S32_LE),
165 FORMAT(S32_BE),
166 FORMAT(U32_LE),
167 FORMAT(U32_BE),
168 FORMAT(FLOAT_LE),
169 FORMAT(FLOAT_BE),
170 FORMAT(FLOAT64_LE),
171 FORMAT(FLOAT64_BE),
172 FORMAT(IEC958_SUBFRAME_LE),
173 FORMAT(IEC958_SUBFRAME_BE),
174 FORMAT(MU_LAW),
175 FORMAT(A_LAW),
176 FORMAT(IMA_ADPCM),
177 FORMAT(MPEG),
178 FORMAT(GSM),
179 FORMAT(SPECIAL),
180 FORMAT(S24_3LE),
181 FORMAT(S24_3BE),
182 FORMAT(U24_3LE),
183 FORMAT(U24_3BE),
184 FORMAT(S20_3LE),
185 FORMAT(S20_3BE),
186 FORMAT(U20_3LE),
187 FORMAT(U20_3BE),
188 FORMAT(S18_3LE),
189 FORMAT(S18_3BE),
190 FORMAT(U18_3LE),
191 FORMAT(U18_3BE),
192 };
193
194 static char *snd_pcm_subformat_names[] = {
195 SUBFORMAT(STD),
196 };
197
198 static char *snd_pcm_tstamp_mode_names[] = {
199 TSTAMP(NONE),
200 TSTAMP(MMAP),
201 };
202
203 static const char *snd_pcm_stream_name(snd_pcm_stream_t stream)
204 {
205 snd_assert(stream <= SNDRV_PCM_STREAM_LAST, return NULL);
206 return snd_pcm_stream_names[stream];
207 }
208
209 static const char *snd_pcm_access_name(snd_pcm_access_t access)
210 {
211 snd_assert(access <= SNDRV_PCM_ACCESS_LAST, return NULL);
212 return snd_pcm_access_names[access];
213 }
214
215 const char *snd_pcm_format_name(snd_pcm_format_t format)
216 {
217 snd_assert(format <= SNDRV_PCM_FORMAT_LAST, return NULL);
218 return snd_pcm_format_names[format];
219 }
220
221 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
222 {
223 snd_assert(subformat <= SNDRV_PCM_SUBFORMAT_LAST, return NULL);
224 return snd_pcm_subformat_names[subformat];
225 }
226
227 static const char *snd_pcm_tstamp_mode_name(snd_pcm_tstamp_t mode)
228 {
229 snd_assert(mode <= SNDRV_PCM_TSTAMP_LAST, return NULL);
230 return snd_pcm_tstamp_mode_names[mode];
231 }
232
233 static const char *snd_pcm_state_name(snd_pcm_state_t state)
234 {
235 snd_assert(state <= SNDRV_PCM_STATE_LAST, return NULL);
236 return snd_pcm_state_names[state];
237 }
238
239 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
240 #include <linux/soundcard.h>
241 static const char *snd_pcm_oss_format_name(int format)
242 {
243 switch (format) {
244 case AFMT_MU_LAW:
245 return "MU_LAW";
246 case AFMT_A_LAW:
247 return "A_LAW";
248 case AFMT_IMA_ADPCM:
249 return "IMA_ADPCM";
250 case AFMT_U8:
251 return "U8";
252 case AFMT_S16_LE:
253 return "S16_LE";
254 case AFMT_S16_BE:
255 return "S16_BE";
256 case AFMT_S8:
257 return "S8";
258 case AFMT_U16_LE:
259 return "U16_LE";
260 case AFMT_U16_BE:
261 return "U16_BE";
262 case AFMT_MPEG:
263 return "MPEG";
264 default:
265 return "unknown";
266 }
267 }
268 #endif
269
270 #ifdef CONFIG_PROC_FS
271 static void snd_pcm_proc_info_read(snd_pcm_substream_t *substream, snd_info_buffer_t *buffer)
272 {
273 snd_pcm_info_t *info;
274 int err;
275
276 if (! substream)
277 return;
278
279 info = kmalloc(sizeof(*info), GFP_KERNEL);
280 if (! info) {
281 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
282 return;
283 }
284
285 err = snd_pcm_info(substream, info);
286 if (err < 0) {
287 snd_iprintf(buffer, "error %d\n", err);
288 kfree(info);
289 return;
290 }
291 snd_iprintf(buffer, "card: %d\n", info->card);
292 snd_iprintf(buffer, "device: %d\n", info->device);
293 snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
294 snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
295 snd_iprintf(buffer, "id: %s\n", info->id);
296 snd_iprintf(buffer, "name: %s\n", info->name);
297 snd_iprintf(buffer, "subname: %s\n", info->subname);
298 snd_iprintf(buffer, "class: %d\n", info->dev_class);
299 snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
300 snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
301 snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
302 kfree(info);
303 }
304
305 static void snd_pcm_stream_proc_info_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
306 {
307 snd_pcm_proc_info_read(((snd_pcm_str_t *)entry->private_data)->substream, buffer);
308 }
309
310 static void snd_pcm_substream_proc_info_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
311 {
312 snd_pcm_proc_info_read((snd_pcm_substream_t *)entry->private_data, buffer);
313 }
314
315 static void snd_pcm_substream_proc_hw_params_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
316 {
317 snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data;
318 snd_pcm_runtime_t *runtime = substream->runtime;
319 if (!runtime) {
320 snd_iprintf(buffer, "closed\n");
321 return;
322 }
323 snd_pcm_stream_lock_irq(substream);
324 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
325 snd_iprintf(buffer, "no setup\n");
326 snd_pcm_stream_unlock_irq(substream);
327 return;
328 }
329 snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
330 snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
331 snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
332 snd_iprintf(buffer, "channels: %u\n", runtime->channels);
333 snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
334 snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
335 snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
336 snd_iprintf(buffer, "tick_time: %u\n", runtime->tick_time);
337 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
338 if (substream->oss.oss) {
339 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
340 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
341 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
342 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
343 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
344 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
345 }
346 #endif
347 snd_pcm_stream_unlock_irq(substream);
348 }
349
350 static void snd_pcm_substream_proc_sw_params_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
351 {
352 snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data;
353 snd_pcm_runtime_t *runtime = substream->runtime;
354 if (!runtime) {
355 snd_iprintf(buffer, "closed\n");
356 return;
357 }
358 snd_pcm_stream_lock_irq(substream);
359 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
360 snd_iprintf(buffer, "no setup\n");
361 snd_pcm_stream_unlock_irq(substream);
362 return;
363 }
364 snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
365 snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
366 snd_iprintf(buffer, "sleep_min: %u\n", runtime->sleep_min);
367 snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
368 snd_iprintf(buffer, "xfer_align: %lu\n", runtime->xfer_align);
369 snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
370 snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
371 snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
372 snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
373 snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
374 snd_pcm_stream_unlock_irq(substream);
375 }
376
377 static void snd_pcm_substream_proc_status_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
378 {
379 snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data;
380 snd_pcm_runtime_t *runtime = substream->runtime;
381 snd_pcm_status_t status;
382 int err;
383 if (!runtime) {
384 snd_iprintf(buffer, "closed\n");
385 return;
386 }
387 memset(&status, 0, sizeof(status));
388 err = snd_pcm_status(substream, &status);
389 if (err < 0) {
390 snd_iprintf(buffer, "error %d\n", err);
391 return;
392 }
393 snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
394 snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
395 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
396 snd_iprintf(buffer, "tstamp : %ld.%09ld\n",
397 status.tstamp.tv_sec, status.tstamp.tv_nsec);
398 snd_iprintf(buffer, "delay : %ld\n", status.delay);
399 snd_iprintf(buffer, "avail : %ld\n", status.avail);
400 snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
401 snd_iprintf(buffer, "-----\n");
402 snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
403 snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
404 }
405 #endif
406
407 #ifdef CONFIG_SND_DEBUG
408 static void snd_pcm_xrun_debug_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
409 {
410 snd_pcm_str_t *pstr = (snd_pcm_str_t *)entry->private_data;
411 snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
412 }
413
414 static void snd_pcm_xrun_debug_write(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
415 {
416 snd_pcm_str_t *pstr = (snd_pcm_str_t *)entry->private_data;
417 char line[64];
418 if (!snd_info_get_line(buffer, line, sizeof(line)))
419 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
420 }
421 #endif
422
423 static int snd_pcm_stream_proc_init(snd_pcm_str_t *pstr)
424 {
425 snd_pcm_t *pcm = pstr->pcm;
426 snd_info_entry_t *entry;
427 char name[16];
428
429 sprintf(name, "pcm%i%c", pcm->device,
430 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
431 if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
432 return -ENOMEM;
433 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
434 if (snd_info_register(entry) < 0) {
435 snd_info_free_entry(entry);
436 return -ENOMEM;
437 }
438 pstr->proc_root = entry;
439
440 if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
441 snd_info_set_text_ops(entry, pstr, 256, snd_pcm_stream_proc_info_read);
442 if (snd_info_register(entry) < 0) {
443 snd_info_free_entry(entry);
444 entry = NULL;
445 }
446 }
447 pstr->proc_info_entry = entry;
448
449 #ifdef CONFIG_SND_DEBUG
450 if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug", pstr->proc_root)) != NULL) {
451 entry->c.text.read_size = 64;
452 entry->c.text.read = snd_pcm_xrun_debug_read;
453 entry->c.text.write_size = 64;
454 entry->c.text.write = snd_pcm_xrun_debug_write;
455 entry->mode |= S_IWUSR;
456 entry->private_data = pstr;
457 if (snd_info_register(entry) < 0) {
458 snd_info_free_entry(entry);
459 entry = NULL;
460 }
461 }
462 pstr->proc_xrun_debug_entry = entry;
463 #endif
464 return 0;
465 }
466
467 static int snd_pcm_stream_proc_done(snd_pcm_str_t *pstr)
468 {
469 #ifdef CONFIG_SND_DEBUG
470 if (pstr->proc_xrun_debug_entry) {
471 snd_info_unregister(pstr->proc_xrun_debug_entry);
472 pstr->proc_xrun_debug_entry = NULL;
473 }
474 #endif
475 if (pstr->proc_info_entry) {
476 snd_info_unregister(pstr->proc_info_entry);
477 pstr->proc_info_entry = NULL;
478 }
479 if (pstr->proc_root) {
480 snd_info_unregister(pstr->proc_root);
481 pstr->proc_root = NULL;
482 }
483 return 0;
484 }
485
486 static int snd_pcm_substream_proc_init(snd_pcm_substream_t *substream)
487 {
488 snd_info_entry_t *entry;
489 snd_card_t *card;
490 char name[16];
491
492 card = substream->pcm->card;
493
494 sprintf(name, "sub%i", substream->number);
495 if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
496 return -ENOMEM;
497 entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
498 if (snd_info_register(entry) < 0) {
499 snd_info_free_entry(entry);
500 return -ENOMEM;
501 }
502 substream->proc_root = entry;
503
504 if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
505 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_info_read);
506 if (snd_info_register(entry) < 0) {
507 snd_info_free_entry(entry);
508 entry = NULL;
509 }
510 }
511 substream->proc_info_entry = entry;
512
513 if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
514 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_hw_params_read);
515 if (snd_info_register(entry) < 0) {
516 snd_info_free_entry(entry);
517 entry = NULL;
518 }
519 }
520 substream->proc_hw_params_entry = entry;
521
522 if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
523 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_sw_params_read);
524 if (snd_info_register(entry) < 0) {
525 snd_info_free_entry(entry);
526 entry = NULL;
527 }
528 }
529 substream->proc_sw_params_entry = entry;
530
531 if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
532 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_status_read);
533 if (snd_info_register(entry) < 0) {
534 snd_info_free_entry(entry);
535 entry = NULL;
536 }
537 }
538 substream->proc_status_entry = entry;
539
540 return 0;
541 }
542
543 static int snd_pcm_substream_proc_done(snd_pcm_substream_t *substream)
544 {
545 if (substream->proc_info_entry) {
546 snd_info_unregister(substream->proc_info_entry);
547 substream->proc_info_entry = NULL;
548 }
549 if (substream->proc_hw_params_entry) {
550 snd_info_unregister(substream->proc_hw_params_entry);
551 substream->proc_hw_params_entry = NULL;
552 }
553 if (substream->proc_sw_params_entry) {
554 snd_info_unregister(substream->proc_sw_params_entry);
555 substream->proc_sw_params_entry = NULL;
556 }
557 if (substream->proc_status_entry) {
558 snd_info_unregister(substream->proc_status_entry);
559 substream->proc_status_entry = NULL;
560 }
561 if (substream->proc_root) {
562 snd_info_unregister(substream->proc_root);
563 substream->proc_root = NULL;
564 }
565 return 0;
566 }
567
568 /**
569 * snd_pcm_new_stream - create a new PCM stream
570 * @pcm: the pcm instance
571 * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
572 * @substream_count: the number of substreams
573 *
574 * Creates a new stream for the pcm.
575 * The corresponding stream on the pcm must have been empty before
576 * calling this, i.e. zero must be given to the argument of
577 * snd_pcm_new().
578 *
579 * Returns zero if successful, or a negative error code on failure.
580 */
581 int snd_pcm_new_stream(snd_pcm_t *pcm, int stream, int substream_count)
582 {
583 int idx, err;
584 snd_pcm_str_t *pstr = &pcm->streams[stream];
585 snd_pcm_substream_t *substream, *prev;
586
587 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
588 init_MUTEX(&pstr->oss.setup_mutex);
589 #endif
590 pstr->stream = stream;
591 pstr->pcm = pcm;
592 pstr->substream_count = substream_count;
593 pstr->reg = &snd_pcm_reg[stream];
594 if (substream_count > 0) {
595 err = snd_pcm_stream_proc_init(pstr);
596 if (err < 0)
597 return err;
598 }
599 prev = NULL;
600 for (idx = 0, prev = NULL; idx < substream_count; idx++) {
601 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
602 if (substream == NULL)
603 return -ENOMEM;
604 substream->pcm = pcm;
605 substream->pstr = pstr;
606 substream->number = idx;
607 substream->stream = stream;
608 sprintf(substream->name, "subdevice #%i", idx);
609 substream->buffer_bytes_max = UINT_MAX;
610 if (prev == NULL)
611 pstr->substream = substream;
612 else
613 prev->next = substream;
614 err = snd_pcm_substream_proc_init(substream);
615 if (err < 0) {
616 kfree(substream);
617 return err;
618 }
619 substream->group = &substream->self_group;
620 spin_lock_init(&substream->self_group.lock);
621 INIT_LIST_HEAD(&substream->self_group.substreams);
622 list_add_tail(&substream->link_list, &substream->self_group.substreams);
623 spin_lock_init(&substream->timer_lock);
624 prev = substream;
625 }
626 return 0;
627 }
628
629 /**
630 * snd_pcm_new - create a new PCM instance
631 * @card: the card instance
632 * @id: the id string
633 * @device: the device index (zero based)
634 * @playback_count: the number of substreams for playback
635 * @capture_count: the number of substreams for capture
636 * @rpcm: the pointer to store the new pcm instance
637 *
638 * Creates a new PCM instance.
639 *
640 * The pcm operators have to be set afterwards to the new instance
641 * via snd_pcm_set_ops().
642 *
643 * Returns zero if successful, or a negative error code on failure.
644 */
645 int snd_pcm_new(snd_card_t * card, char *id, int device,
646 int playback_count, int capture_count,
647 snd_pcm_t ** rpcm)
648 {
649 snd_pcm_t *pcm;
650 int err;
651 static snd_device_ops_t ops = {
652 .dev_free = snd_pcm_dev_free,
653 .dev_register = snd_pcm_dev_register,
654 .dev_disconnect = snd_pcm_dev_disconnect,
655 .dev_unregister = snd_pcm_dev_unregister
656 };
657
658 snd_assert(rpcm != NULL, return -EINVAL);
659 *rpcm = NULL;
660 snd_assert(card != NULL, return -ENXIO);
661 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
662 if (pcm == NULL)
663 return -ENOMEM;
664 pcm->card = card;
665 pcm->device = device;
666 if (id) {
667 strlcpy(pcm->id, id, sizeof(pcm->id));
668 }
669 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
670 snd_pcm_free(pcm);
671 return err;
672 }
673 if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
674 snd_pcm_free(pcm);
675 return err;
676 }
677 init_MUTEX(&pcm->open_mutex);
678 init_waitqueue_head(&pcm->open_wait);
679 if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
680 snd_pcm_free(pcm);
681 return err;
682 }
683 *rpcm = pcm;
684 return 0;
685 }
686
687 static void snd_pcm_free_stream(snd_pcm_str_t * pstr)
688 {
689 snd_pcm_substream_t *substream, *substream_next;
690 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
691 snd_pcm_oss_setup_t *setup, *setupn;
692 #endif
693 substream = pstr->substream;
694 while (substream) {
695 substream_next = substream->next;
696 snd_pcm_substream_proc_done(substream);
697 kfree(substream);
698 substream = substream_next;
699 }
700 snd_pcm_stream_proc_done(pstr);
701 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
702 for (setup = pstr->oss.setup_list; setup; setup = setupn) {
703 setupn = setup->next;
704 kfree(setup->task_name);
705 kfree(setup);
706 }
707 #endif
708 }
709
710 static int snd_pcm_free(snd_pcm_t *pcm)
711 {
712 snd_assert(pcm != NULL, return -ENXIO);
713 if (pcm->private_free)
714 pcm->private_free(pcm);
715 snd_pcm_lib_preallocate_free_for_all(pcm);
716 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
717 snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
718 kfree(pcm);
719 return 0;
720 }
721
722 static int snd_pcm_dev_free(snd_device_t *device)
723 {
724 snd_pcm_t *pcm = device->device_data;
725 return snd_pcm_free(pcm);
726 }
727
728 static void snd_pcm_tick_timer_func(unsigned long data)
729 {
730 snd_pcm_substream_t *substream = (snd_pcm_substream_t*) data;
731 snd_pcm_tick_elapsed(substream);
732 }
733
734 int snd_pcm_open_substream(snd_pcm_t *pcm, int stream,
735 snd_pcm_substream_t **rsubstream)
736 {
737 snd_pcm_str_t * pstr;
738 snd_pcm_substream_t * substream;
739 snd_pcm_runtime_t * runtime;
740 snd_ctl_file_t *kctl;
741 snd_card_t *card;
742 struct list_head *list;
743 int prefer_subdevice = -1;
744 size_t size;
745
746 snd_assert(rsubstream != NULL, return -EINVAL);
747 *rsubstream = NULL;
748 snd_assert(pcm != NULL, return -ENXIO);
749 pstr = &pcm->streams[stream];
750 if (pstr->substream == NULL)
751 return -ENODEV;
752
753 card = pcm->card;
754 down_read(&card->controls_rwsem);
755 list_for_each(list, &card->ctl_files) {
756 kctl = snd_ctl_file(list);
757 if (kctl->pid == current->pid) {
758 prefer_subdevice = kctl->prefer_pcm_subdevice;
759 break;
760 }
761 }
762 up_read(&card->controls_rwsem);
763
764 if (pstr->substream_count == 0)
765 return -ENODEV;
766 switch (stream) {
767 case SNDRV_PCM_STREAM_PLAYBACK:
768 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
769 for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
770 if (SUBSTREAM_BUSY(substream))
771 return -EAGAIN;
772 }
773 }
774 break;
775 case SNDRV_PCM_STREAM_CAPTURE:
776 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
777 for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
778 if (SUBSTREAM_BUSY(substream))
779 return -EAGAIN;
780 }
781 }
782 break;
783 default:
784 return -EINVAL;
785 }
786
787 if (prefer_subdevice >= 0) {
788 for (substream = pstr->substream; substream; substream = substream->next)
789 if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
790 goto __ok;
791 }
792 for (substream = pstr->substream; substream; substream = substream->next)
793 if (!SUBSTREAM_BUSY(substream))
794 break;
795 __ok:
796 if (substream == NULL)
797 return -EAGAIN;
798
799 runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
800 if (runtime == NULL)
801 return -ENOMEM;
802
803 size = PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t));
804 runtime->status = snd_malloc_pages(size, GFP_KERNEL);
805 if (runtime->status == NULL) {
806 kfree(runtime);
807 return -ENOMEM;
808 }
809 memset((void*)runtime->status, 0, size);
810
811 size = PAGE_ALIGN(sizeof(snd_pcm_mmap_control_t));
812 runtime->control = snd_malloc_pages(size, GFP_KERNEL);
813 if (runtime->control == NULL) {
814 snd_free_pages((void*)runtime->status, PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t)));
815 kfree(runtime);
816 return -ENOMEM;
817 }
818 memset((void*)runtime->control, 0, size);
819
820 init_waitqueue_head(&runtime->sleep);
821 atomic_set(&runtime->mmap_count, 0);
822 init_timer(&runtime->tick_timer);
823 runtime->tick_timer.function = snd_pcm_tick_timer_func;
824 runtime->tick_timer.data = (unsigned long) substream;
825
826 runtime->status->state = SNDRV_PCM_STATE_OPEN;
827
828 substream->runtime = runtime;
829 substream->private_data = pcm->private_data;
830 pstr->substream_opened++;
831 *rsubstream = substream;
832 return 0;
833 }
834
835 void snd_pcm_release_substream(snd_pcm_substream_t *substream)
836 {
837 snd_pcm_runtime_t * runtime;
838 substream->file = NULL;
839 runtime = substream->runtime;
840 snd_assert(runtime != NULL, return);
841 if (runtime->private_free != NULL)
842 runtime->private_free(runtime);
843 snd_free_pages((void*)runtime->status, PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t)));
844 snd_free_pages((void*)runtime->control, PAGE_ALIGN(sizeof(snd_pcm_mmap_control_t)));
845 kfree(runtime->hw_constraints.rules);
846 kfree(runtime);
847 substream->runtime = NULL;
848 substream->pstr->substream_opened--;
849 }
850
851 static int snd_pcm_dev_register(snd_device_t *device)
852 {
853 int idx, cidx, err;
854 unsigned short minor;
855 snd_pcm_substream_t *substream;
856 struct list_head *list;
857 char str[16];
858 snd_pcm_t *pcm = device->device_data;
859
860 snd_assert(pcm != NULL && device != NULL, return -ENXIO);
861 down(&register_mutex);
862 idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
863 if (snd_pcm_devices[idx]) {
864 up(&register_mutex);
865 return -EBUSY;
866 }
867 snd_pcm_devices[idx] = pcm;
868 for (cidx = 0; cidx < 2; cidx++) {
869 int devtype = -1;
870 if (pcm->streams[cidx].substream == NULL)
871 continue;
872 switch (cidx) {
873 case SNDRV_PCM_STREAM_PLAYBACK:
874 sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
875 minor = SNDRV_MINOR_PCM_PLAYBACK + idx;
876 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
877 break;
878 case SNDRV_PCM_STREAM_CAPTURE:
879 sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
880 minor = SNDRV_MINOR_PCM_CAPTURE + idx;
881 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
882 break;
883 }
884 if ((err = snd_register_device(devtype, pcm->card, pcm->device, pcm->streams[cidx].reg, str)) < 0) {
885 snd_pcm_devices[idx] = NULL;
886 up(&register_mutex);
887 return err;
888 }
889 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
890 snd_pcm_timer_init(substream);
891 }
892 list_for_each(list, &snd_pcm_notify_list) {
893 snd_pcm_notify_t *notify;
894 notify = list_entry(list, snd_pcm_notify_t, list);
895 notify->n_register(pcm);
896 }
897 up(&register_mutex);
898 return 0;
899 }
900
901 static int snd_pcm_dev_disconnect(snd_device_t *device)
902 {
903 snd_pcm_t *pcm = device->device_data;
904 struct list_head *list;
905 snd_pcm_substream_t *substream;
906 int idx, cidx;
907
908 down(&register_mutex);
909 idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
910 snd_pcm_devices[idx] = NULL;
911 for (cidx = 0; cidx < 2; cidx++)
912 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
913 if (substream->runtime)
914 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
915 list_for_each(list, &snd_pcm_notify_list) {
916 snd_pcm_notify_t *notify;
917 notify = list_entry(list, snd_pcm_notify_t, list);
918 notify->n_disconnect(pcm);
919 }
920 up(&register_mutex);
921 return 0;
922 }
923
924 static int snd_pcm_dev_unregister(snd_device_t *device)
925 {
926 int idx, cidx, devtype;
927 snd_pcm_substream_t *substream;
928 struct list_head *list;
929 snd_pcm_t *pcm = device->device_data;
930
931 snd_assert(pcm != NULL, return -ENXIO);
932 down(&register_mutex);
933 idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
934 snd_pcm_devices[idx] = NULL;
935 for (cidx = 0; cidx < 2; cidx++) {
936 devtype = -1;
937 switch (cidx) {
938 case SNDRV_PCM_STREAM_PLAYBACK:
939 devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
940 break;
941 case SNDRV_PCM_STREAM_CAPTURE:
942 devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
943 break;
944 }
945 snd_unregister_device(devtype, pcm->card, pcm->device);
946 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
947 snd_pcm_timer_done(substream);
948 }
949 list_for_each(list, &snd_pcm_notify_list) {
950 snd_pcm_notify_t *notify;
951 notify = list_entry(list, snd_pcm_notify_t, list);
952 notify->n_unregister(pcm);
953 }
954 up(&register_mutex);
955 return snd_pcm_free(pcm);
956 }
957
958 int snd_pcm_notify(snd_pcm_notify_t *notify, int nfree)
959 {
960 int idx;
961
962 snd_assert(notify != NULL && notify->n_register != NULL && notify->n_unregister != NULL, return -EINVAL);
963 down(&register_mutex);
964 if (nfree) {
965 list_del(&notify->list);
966 for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
967 if (snd_pcm_devices[idx] == NULL)
968 continue;
969 notify->n_unregister(snd_pcm_devices[idx]);
970 }
971 } else {
972 list_add_tail(&notify->list, &snd_pcm_notify_list);
973 for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
974 if (snd_pcm_devices[idx] == NULL)
975 continue;
976 notify->n_register(snd_pcm_devices[idx]);
977 }
978 }
979 up(&register_mutex);
980 return 0;
981 }
982
983 /*
984 * Info interface
985 */
986
987 static void snd_pcm_proc_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
988 {
989 int idx;
990 snd_pcm_t *pcm;
991
992 down(&register_mutex);
993 for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
994 pcm = snd_pcm_devices[idx];
995 if (pcm == NULL)
996 continue;
997 snd_iprintf(buffer, "%02i-%02i: %s : %s", idx / SNDRV_PCM_DEVICES,
998 idx % SNDRV_PCM_DEVICES, pcm->id, pcm->name);
999 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
1000 snd_iprintf(buffer, " : playback %i", pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1001 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1002 snd_iprintf(buffer, " : capture %i", pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1003 snd_iprintf(buffer, "\n");
1004 }
1005 up(&register_mutex);
1006 }
1007
1008 /*
1009 * ENTRY functions
1010 */
1011
1012 static snd_info_entry_t *snd_pcm_proc_entry = NULL;
1013
1014 static int __init alsa_pcm_init(void)
1015 {
1016 snd_info_entry_t *entry;
1017
1018 snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1019 snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1020 if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1021 snd_info_set_text_ops(entry, NULL, SNDRV_CARDS * SNDRV_PCM_DEVICES * 128, snd_pcm_proc_read);
1022 if (snd_info_register(entry) < 0) {
1023 snd_info_free_entry(entry);
1024 entry = NULL;
1025 }
1026 }
1027 snd_pcm_proc_entry = entry;
1028 return 0;
1029 }
1030
1031 static void __exit alsa_pcm_exit(void)
1032 {
1033 snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1034 snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1035 if (snd_pcm_proc_entry) {
1036 snd_info_unregister(snd_pcm_proc_entry);
1037 snd_pcm_proc_entry = NULL;
1038 }
1039 }
1040
1041 module_init(alsa_pcm_init)
1042 module_exit(alsa_pcm_exit)
1043
1044 EXPORT_SYMBOL(snd_pcm_devices);
1045 EXPORT_SYMBOL(snd_pcm_new);
1046 EXPORT_SYMBOL(snd_pcm_new_stream);
1047 EXPORT_SYMBOL(snd_pcm_notify);
1048 EXPORT_SYMBOL(snd_pcm_open_substream);
1049 EXPORT_SYMBOL(snd_pcm_release_substream);
1050 EXPORT_SYMBOL(snd_pcm_format_name);
1051 /* pcm_native.c */
1052 EXPORT_SYMBOL(snd_pcm_link_rwlock);
1053 #ifdef CONFIG_PM
1054 EXPORT_SYMBOL(snd_pcm_suspend);
1055 EXPORT_SYMBOL(snd_pcm_suspend_all);
1056 #endif
1057 EXPORT_SYMBOL(snd_pcm_kernel_playback_ioctl);
1058 EXPORT_SYMBOL(snd_pcm_kernel_capture_ioctl);
1059 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
1060 EXPORT_SYMBOL(snd_pcm_mmap_data);
1061 #if SNDRV_PCM_INFO_MMAP_IOMEM
1062 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
1063 #endif
1064 /* pcm_misc.c */
1065 EXPORT_SYMBOL(snd_pcm_format_signed);
1066 EXPORT_SYMBOL(snd_pcm_format_unsigned);
1067 EXPORT_SYMBOL(snd_pcm_format_linear);
1068 EXPORT_SYMBOL(snd_pcm_format_little_endian);
1069 EXPORT_SYMBOL(snd_pcm_format_big_endian);
1070 EXPORT_SYMBOL(snd_pcm_format_width);
1071 EXPORT_SYMBOL(snd_pcm_format_physical_width);
1072 EXPORT_SYMBOL(snd_pcm_format_size);
1073 EXPORT_SYMBOL(snd_pcm_format_silence_64);
1074 EXPORT_SYMBOL(snd_pcm_format_set_silence);
1075 EXPORT_SYMBOL(snd_pcm_build_linear_format);
1076 EXPORT_SYMBOL(snd_pcm_limit_hw_rates);
Linux with added FPC-III support