xref: /openbmc/linux/sound/core/pcm.c (revision d5cb9783536a41df9f9cba5b0a1d78047ed787f7)
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 	snd_runtime_check(substream, return);
277 
278 	info = kmalloc(sizeof(*info), GFP_KERNEL);
279 	if (! info) {
280 		printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
281 		return;
282 	}
283 
284 	err = snd_pcm_info(substream, info);
285 	if (err < 0) {
286 		snd_iprintf(buffer, "error %d\n", err);
287 		kfree(info);
288 		return;
289 	}
290 	snd_iprintf(buffer, "card: %d\n", info->card);
291 	snd_iprintf(buffer, "device: %d\n", info->device);
292 	snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
293 	snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
294 	snd_iprintf(buffer, "id: %s\n", info->id);
295 	snd_iprintf(buffer, "name: %s\n", info->name);
296 	snd_iprintf(buffer, "subname: %s\n", info->subname);
297 	snd_iprintf(buffer, "class: %d\n", info->dev_class);
298 	snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
299 	snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
300 	snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
301 	kfree(info);
302 }
303 
304 static void snd_pcm_stream_proc_info_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
305 {
306 	snd_pcm_proc_info_read(((snd_pcm_str_t *)entry->private_data)->substream, buffer);
307 }
308 
309 static void snd_pcm_substream_proc_info_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
310 {
311 	snd_pcm_proc_info_read((snd_pcm_substream_t *)entry->private_data, buffer);
312 }
313 
314 static void snd_pcm_substream_proc_hw_params_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
315 {
316 	snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data;
317 	snd_pcm_runtime_t *runtime = substream->runtime;
318 	if (!runtime) {
319 		snd_iprintf(buffer, "closed\n");
320 		return;
321 	}
322 	snd_pcm_stream_lock_irq(substream);
323 	if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
324 		snd_iprintf(buffer, "no setup\n");
325 		snd_pcm_stream_unlock_irq(substream);
326 		return;
327 	}
328 	snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
329 	snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
330 	snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
331 	snd_iprintf(buffer, "channels: %u\n", runtime->channels);
332 	snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
333 	snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
334 	snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
335 	snd_iprintf(buffer, "tick_time: %u\n", runtime->tick_time);
336 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
337 	if (substream->oss.oss) {
338 		snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
339 		snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
340 		snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
341 		snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
342 		snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
343 		snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
344 	}
345 #endif
346 	snd_pcm_stream_unlock_irq(substream);
347 }
348 
349 static void snd_pcm_substream_proc_sw_params_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
350 {
351 	snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data;
352 	snd_pcm_runtime_t *runtime = substream->runtime;
353 	if (!runtime) {
354 		snd_iprintf(buffer, "closed\n");
355 		return;
356 	}
357 	snd_pcm_stream_lock_irq(substream);
358 	if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
359 		snd_iprintf(buffer, "no setup\n");
360 		snd_pcm_stream_unlock_irq(substream);
361 		return;
362 	}
363 	snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
364 	snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
365 	snd_iprintf(buffer, "sleep_min: %u\n", runtime->sleep_min);
366 	snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
367 	snd_iprintf(buffer, "xfer_align: %lu\n", runtime->xfer_align);
368 	snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
369 	snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
370 	snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
371 	snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
372 	snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
373 	snd_pcm_stream_unlock_irq(substream);
374 }
375 
376 static void snd_pcm_substream_proc_status_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
377 {
378 	snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data;
379 	snd_pcm_runtime_t *runtime = substream->runtime;
380 	snd_pcm_status_t status;
381 	int err;
382 	if (!runtime) {
383 		snd_iprintf(buffer, "closed\n");
384 		return;
385 	}
386 	memset(&status, 0, sizeof(status));
387 	err = snd_pcm_status(substream, &status);
388 	if (err < 0) {
389 		snd_iprintf(buffer, "error %d\n", err);
390 		return;
391 	}
392 	snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
393 	snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
394 		status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
395 	snd_iprintf(buffer, "tstamp      : %ld.%09ld\n",
396 		status.tstamp.tv_sec, status.tstamp.tv_nsec);
397 	snd_iprintf(buffer, "delay       : %ld\n", status.delay);
398 	snd_iprintf(buffer, "avail       : %ld\n", status.avail);
399 	snd_iprintf(buffer, "avail_max   : %ld\n", status.avail_max);
400 	snd_iprintf(buffer, "-----\n");
401 	snd_iprintf(buffer, "hw_ptr      : %ld\n", runtime->status->hw_ptr);
402 	snd_iprintf(buffer, "appl_ptr    : %ld\n", runtime->control->appl_ptr);
403 }
404 #endif
405 
406 #ifdef CONFIG_SND_DEBUG
407 static void snd_pcm_xrun_debug_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
408 {
409 	snd_pcm_str_t *pstr = (snd_pcm_str_t *)entry->private_data;
410 	snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
411 }
412 
413 static void snd_pcm_xrun_debug_write(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
414 {
415 	snd_pcm_str_t *pstr = (snd_pcm_str_t *)entry->private_data;
416 	char line[64];
417 	if (!snd_info_get_line(buffer, line, sizeof(line)))
418 		pstr->xrun_debug = simple_strtoul(line, NULL, 10);
419 }
420 #endif
421 
422 static int snd_pcm_stream_proc_init(snd_pcm_str_t *pstr)
423 {
424 	snd_pcm_t *pcm = pstr->pcm;
425 	snd_info_entry_t *entry;
426 	char name[16];
427 
428 	sprintf(name, "pcm%i%c", pcm->device,
429 		pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
430 	if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
431 		return -ENOMEM;
432 	entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
433 	if (snd_info_register(entry) < 0) {
434 		snd_info_free_entry(entry);
435 		return -ENOMEM;
436 	}
437 	pstr->proc_root = entry;
438 
439 	if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
440 		snd_info_set_text_ops(entry, pstr, 256, snd_pcm_stream_proc_info_read);
441 		if (snd_info_register(entry) < 0) {
442 			snd_info_free_entry(entry);
443 			entry = NULL;
444 		}
445 	}
446 	pstr->proc_info_entry = entry;
447 
448 #ifdef CONFIG_SND_DEBUG
449 	if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug", pstr->proc_root)) != NULL) {
450 		entry->c.text.read_size = 64;
451 		entry->c.text.read = snd_pcm_xrun_debug_read;
452 		entry->c.text.write_size = 64;
453 		entry->c.text.write = snd_pcm_xrun_debug_write;
454 		entry->mode |= S_IWUSR;
455 		entry->private_data = pstr;
456 		if (snd_info_register(entry) < 0) {
457 			snd_info_free_entry(entry);
458 			entry = NULL;
459 		}
460 	}
461 	pstr->proc_xrun_debug_entry = entry;
462 #endif
463 	return 0;
464 }
465 
466 static int snd_pcm_stream_proc_done(snd_pcm_str_t *pstr)
467 {
468 #ifdef CONFIG_SND_DEBUG
469 	if (pstr->proc_xrun_debug_entry) {
470 		snd_info_unregister(pstr->proc_xrun_debug_entry);
471 		pstr->proc_xrun_debug_entry = NULL;
472 	}
473 #endif
474 	if (pstr->proc_info_entry) {
475 		snd_info_unregister(pstr->proc_info_entry);
476 		pstr->proc_info_entry = NULL;
477 	}
478 	if (pstr->proc_root) {
479 		snd_info_unregister(pstr->proc_root);
480 		pstr->proc_root = NULL;
481 	}
482 	return 0;
483 }
484 
485 static int snd_pcm_substream_proc_init(snd_pcm_substream_t *substream)
486 {
487 	snd_info_entry_t *entry;
488 	snd_card_t *card;
489 	char name[16];
490 
491 	card = substream->pcm->card;
492 
493 	sprintf(name, "sub%i", substream->number);
494 	if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
495 		return -ENOMEM;
496 	entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
497 	if (snd_info_register(entry) < 0) {
498 		snd_info_free_entry(entry);
499 		return -ENOMEM;
500 	}
501 	substream->proc_root = entry;
502 
503 	if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
504 		snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_info_read);
505 		if (snd_info_register(entry) < 0) {
506 			snd_info_free_entry(entry);
507 			entry = NULL;
508 		}
509 	}
510 	substream->proc_info_entry = entry;
511 
512 	if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
513 		snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_hw_params_read);
514 		if (snd_info_register(entry) < 0) {
515 			snd_info_free_entry(entry);
516 			entry = NULL;
517 		}
518 	}
519 	substream->proc_hw_params_entry = entry;
520 
521 	if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
522 		snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_sw_params_read);
523 		if (snd_info_register(entry) < 0) {
524 			snd_info_free_entry(entry);
525 			entry = NULL;
526 		}
527 	}
528 	substream->proc_sw_params_entry = entry;
529 
530 	if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
531 		snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_status_read);
532 		if (snd_info_register(entry) < 0) {
533 			snd_info_free_entry(entry);
534 			entry = NULL;
535 		}
536 	}
537 	substream->proc_status_entry = entry;
538 
539 	return 0;
540 }
541 
542 static int snd_pcm_substream_proc_done(snd_pcm_substream_t *substream)
543 {
544 	if (substream->proc_info_entry) {
545 		snd_info_unregister(substream->proc_info_entry);
546 		substream->proc_info_entry = NULL;
547 	}
548 	if (substream->proc_hw_params_entry) {
549 		snd_info_unregister(substream->proc_hw_params_entry);
550 		substream->proc_hw_params_entry = NULL;
551 	}
552 	if (substream->proc_sw_params_entry) {
553 		snd_info_unregister(substream->proc_sw_params_entry);
554 		substream->proc_sw_params_entry = NULL;
555 	}
556 	if (substream->proc_status_entry) {
557 		snd_info_unregister(substream->proc_status_entry);
558 		substream->proc_status_entry = NULL;
559 	}
560 	if (substream->proc_root) {
561 		snd_info_unregister(substream->proc_root);
562 		substream->proc_root = NULL;
563 	}
564 	return 0;
565 }
566 
567 /**
568  * snd_pcm_new_stream - create a new PCM stream
569  * @pcm: the pcm instance
570  * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
571  * @substream_count: the number of substreams
572  *
573  * Creates a new stream for the pcm.
574  * The corresponding stream on the pcm must have been empty before
575  * calling this, i.e. zero must be given to the argument of
576  * snd_pcm_new().
577  *
578  * Returns zero if successful, or a negative error code on failure.
579  */
580 int snd_pcm_new_stream(snd_pcm_t *pcm, int stream, int substream_count)
581 {
582 	int idx, err;
583 	snd_pcm_str_t *pstr = &pcm->streams[stream];
584 	snd_pcm_substream_t *substream, *prev;
585 
586 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
587 	init_MUTEX(&pstr->oss.setup_mutex);
588 #endif
589 	pstr->stream = stream;
590 	pstr->pcm = pcm;
591 	pstr->substream_count = substream_count;
592 	pstr->reg = &snd_pcm_reg[stream];
593 	if (substream_count > 0) {
594 		err = snd_pcm_stream_proc_init(pstr);
595 		if (err < 0)
596 			return err;
597 	}
598 	prev = NULL;
599 	for (idx = 0, prev = NULL; idx < substream_count; idx++) {
600 		substream = kzalloc(sizeof(*substream), GFP_KERNEL);
601 		if (substream == NULL)
602 			return -ENOMEM;
603 		substream->pcm = pcm;
604 		substream->pstr = pstr;
605 		substream->number = idx;
606 		substream->stream = stream;
607 		sprintf(substream->name, "subdevice #%i", idx);
608 		substream->buffer_bytes_max = UINT_MAX;
609 		if (prev == NULL)
610 			pstr->substream = substream;
611 		else
612 			prev->next = substream;
613 		err = snd_pcm_substream_proc_init(substream);
614 		if (err < 0) {
615 			kfree(substream);
616 			return err;
617 		}
618 		substream->group = &substream->self_group;
619 		spin_lock_init(&substream->self_group.lock);
620 		INIT_LIST_HEAD(&substream->self_group.substreams);
621 		list_add_tail(&substream->link_list, &substream->self_group.substreams);
622 		spin_lock_init(&substream->timer_lock);
623 		prev = substream;
624 	}
625 	return 0;
626 }
627 
628 /**
629  * snd_pcm_new - create a new PCM instance
630  * @card: the card instance
631  * @id: the id string
632  * @device: the device index (zero based)
633  * @playback_count: the number of substreams for playback
634  * @capture_count: the number of substreams for capture
635  * @rpcm: the pointer to store the new pcm instance
636  *
637  * Creates a new PCM instance.
638  *
639  * The pcm operators have to be set afterwards to the new instance
640  * via snd_pcm_set_ops().
641  *
642  * Returns zero if successful, or a negative error code on failure.
643  */
644 int snd_pcm_new(snd_card_t * card, char *id, int device,
645 		int playback_count, int capture_count,
646 	        snd_pcm_t ** rpcm)
647 {
648 	snd_pcm_t *pcm;
649 	int err;
650 	static snd_device_ops_t ops = {
651 		.dev_free = snd_pcm_dev_free,
652 		.dev_register =	snd_pcm_dev_register,
653 		.dev_disconnect = snd_pcm_dev_disconnect,
654 		.dev_unregister = snd_pcm_dev_unregister
655 	};
656 
657 	snd_assert(rpcm != NULL, return -EINVAL);
658 	*rpcm = NULL;
659 	snd_assert(card != NULL, return -ENXIO);
660 	pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
661 	if (pcm == NULL)
662 		return -ENOMEM;
663 	pcm->card = card;
664 	pcm->device = device;
665 	if (id) {
666 		strlcpy(pcm->id, id, sizeof(pcm->id));
667 	}
668 	if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
669 		snd_pcm_free(pcm);
670 		return err;
671 	}
672 	if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
673 		snd_pcm_free(pcm);
674 		return err;
675 	}
676 	init_MUTEX(&pcm->open_mutex);
677 	init_waitqueue_head(&pcm->open_wait);
678 	if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
679 		snd_pcm_free(pcm);
680 		return err;
681 	}
682 	*rpcm = pcm;
683 	return 0;
684 }
685 
686 static void snd_pcm_free_stream(snd_pcm_str_t * pstr)
687 {
688 	snd_pcm_substream_t *substream, *substream_next;
689 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
690 	snd_pcm_oss_setup_t *setup, *setupn;
691 #endif
692 	substream = pstr->substream;
693 	while (substream) {
694 		substream_next = substream->next;
695 		snd_pcm_substream_proc_done(substream);
696 		kfree(substream);
697 		substream = substream_next;
698 	}
699 	snd_pcm_stream_proc_done(pstr);
700 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
701 	for (setup = pstr->oss.setup_list; setup; setup = setupn) {
702 		setupn = setup->next;
703 		kfree(setup->task_name);
704 		kfree(setup);
705 	}
706 #endif
707 }
708 
709 static int snd_pcm_free(snd_pcm_t *pcm)
710 {
711 	snd_assert(pcm != NULL, return -ENXIO);
712 	if (pcm->private_free)
713 		pcm->private_free(pcm);
714 	snd_pcm_lib_preallocate_free_for_all(pcm);
715 	snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
716 	snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
717 	kfree(pcm);
718 	return 0;
719 }
720 
721 static int snd_pcm_dev_free(snd_device_t *device)
722 {
723 	snd_pcm_t *pcm = device->device_data;
724 	return snd_pcm_free(pcm);
725 }
726 
727 static void snd_pcm_tick_timer_func(unsigned long data)
728 {
729 	snd_pcm_substream_t *substream = (snd_pcm_substream_t*) data;
730 	snd_pcm_tick_elapsed(substream);
731 }
732 
733 int snd_pcm_open_substream(snd_pcm_t *pcm, int stream,
734 			   snd_pcm_substream_t **rsubstream)
735 {
736 	snd_pcm_str_t * pstr;
737 	snd_pcm_substream_t * substream;
738 	snd_pcm_runtime_t * runtime;
739 	snd_ctl_file_t *kctl;
740 	snd_card_t *card;
741 	struct list_head *list;
742 	int prefer_subdevice = -1;
743 	size_t size;
744 
745 	snd_assert(rsubstream != NULL, return -EINVAL);
746 	*rsubstream = NULL;
747 	snd_assert(pcm != NULL, return -ENXIO);
748 	pstr = &pcm->streams[stream];
749 	if (pstr->substream == NULL)
750 		return -ENODEV;
751 
752 	card = pcm->card;
753 	down_read(&card->controls_rwsem);
754 	list_for_each(list, &card->ctl_files) {
755 		kctl = snd_ctl_file(list);
756 		if (kctl->pid == current->pid) {
757 			prefer_subdevice = kctl->prefer_pcm_subdevice;
758 			break;
759 		}
760 	}
761 	up_read(&card->controls_rwsem);
762 
763 	if (pstr->substream_count == 0)
764 		return -ENODEV;
765 	switch (stream) {
766 	case SNDRV_PCM_STREAM_PLAYBACK:
767 		if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
768 			for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
769 				if (SUBSTREAM_BUSY(substream))
770 					return -EAGAIN;
771 			}
772 		}
773 		break;
774 	case SNDRV_PCM_STREAM_CAPTURE:
775 		if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
776 			for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
777 				if (SUBSTREAM_BUSY(substream))
778 					return -EAGAIN;
779 			}
780 		}
781 		break;
782 	default:
783 		return -EINVAL;
784 	}
785 
786 	if (prefer_subdevice >= 0) {
787 		for (substream = pstr->substream; substream; substream = substream->next)
788 			if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
789 				goto __ok;
790 	}
791 	for (substream = pstr->substream; substream; substream = substream->next)
792 		if (!SUBSTREAM_BUSY(substream))
793 			break;
794       __ok:
795 	if (substream == NULL)
796 		return -EAGAIN;
797 
798 	runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
799 	if (runtime == NULL)
800 		return -ENOMEM;
801 
802 	size = PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t));
803 	runtime->status = snd_malloc_pages(size, GFP_KERNEL);
804 	if (runtime->status == NULL) {
805 		kfree(runtime);
806 		return -ENOMEM;
807 	}
808 	memset((void*)runtime->status, 0, size);
809 
810 	size = PAGE_ALIGN(sizeof(snd_pcm_mmap_control_t));
811 	runtime->control = snd_malloc_pages(size, GFP_KERNEL);
812 	if (runtime->control == NULL) {
813 		snd_free_pages((void*)runtime->status, PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t)));
814 		kfree(runtime);
815 		return -ENOMEM;
816 	}
817 	memset((void*)runtime->control, 0, size);
818 
819 	init_waitqueue_head(&runtime->sleep);
820 	atomic_set(&runtime->mmap_count, 0);
821 	init_timer(&runtime->tick_timer);
822 	runtime->tick_timer.function = snd_pcm_tick_timer_func;
823 	runtime->tick_timer.data = (unsigned long) substream;
824 
825 	runtime->status->state = SNDRV_PCM_STATE_OPEN;
826 
827 	substream->runtime = runtime;
828 	substream->private_data = pcm->private_data;
829 	pstr->substream_opened++;
830 	*rsubstream = substream;
831 	return 0;
832 }
833 
834 void snd_pcm_release_substream(snd_pcm_substream_t *substream)
835 {
836 	snd_pcm_runtime_t * runtime;
837 	substream->file = NULL;
838 	runtime = substream->runtime;
839 	snd_assert(runtime != NULL, return);
840 	if (runtime->private_free != NULL)
841 		runtime->private_free(runtime);
842 	snd_free_pages((void*)runtime->status, PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t)));
843 	snd_free_pages((void*)runtime->control, PAGE_ALIGN(sizeof(snd_pcm_mmap_control_t)));
844 	kfree(runtime->hw_constraints.rules);
845 	kfree(runtime);
846 	substream->runtime = NULL;
847 	substream->pstr->substream_opened--;
848 }
849 
850 static int snd_pcm_dev_register(snd_device_t *device)
851 {
852 	int idx, cidx, err;
853 	unsigned short minor;
854 	snd_pcm_substream_t *substream;
855 	struct list_head *list;
856 	char str[16];
857 	snd_pcm_t *pcm = device->device_data;
858 
859 	snd_assert(pcm != NULL && device != NULL, return -ENXIO);
860 	down(&register_mutex);
861 	idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
862 	if (snd_pcm_devices[idx]) {
863 		up(&register_mutex);
864 		return -EBUSY;
865 	}
866 	snd_pcm_devices[idx] = pcm;
867 	for (cidx = 0; cidx < 2; cidx++) {
868 		int devtype = -1;
869 		if (pcm->streams[cidx].substream == NULL)
870 			continue;
871 		switch (cidx) {
872 		case SNDRV_PCM_STREAM_PLAYBACK:
873 			sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
874 			minor = SNDRV_MINOR_PCM_PLAYBACK + idx;
875 			devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
876 			break;
877 		case SNDRV_PCM_STREAM_CAPTURE:
878 			sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
879 			minor = SNDRV_MINOR_PCM_CAPTURE + idx;
880 			devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
881 			break;
882 		}
883 		if ((err = snd_register_device(devtype, pcm->card, pcm->device, pcm->streams[cidx].reg, str)) < 0) {
884 			snd_pcm_devices[idx] = NULL;
885 			up(&register_mutex);
886 			return err;
887 		}
888 		for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
889 			snd_pcm_timer_init(substream);
890 	}
891 	list_for_each(list, &snd_pcm_notify_list) {
892 		snd_pcm_notify_t *notify;
893 		notify = list_entry(list, snd_pcm_notify_t, list);
894 		notify->n_register(pcm);
895 	}
896 	up(&register_mutex);
897 	return 0;
898 }
899 
900 static int snd_pcm_dev_disconnect(snd_device_t *device)
901 {
902 	snd_pcm_t *pcm = device->device_data;
903 	struct list_head *list;
904 	snd_pcm_substream_t *substream;
905 	int idx, cidx;
906 
907 	down(&register_mutex);
908 	idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
909 	snd_pcm_devices[idx] = NULL;
910 	for (cidx = 0; cidx < 2; cidx++)
911 		for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
912 			if (substream->runtime)
913 				substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
914 	list_for_each(list, &snd_pcm_notify_list) {
915 		snd_pcm_notify_t *notify;
916 		notify = list_entry(list, snd_pcm_notify_t, list);
917 		notify->n_disconnect(pcm);
918 	}
919 	up(&register_mutex);
920 	return 0;
921 }
922 
923 static int snd_pcm_dev_unregister(snd_device_t *device)
924 {
925 	int idx, cidx, devtype;
926 	snd_pcm_substream_t *substream;
927 	struct list_head *list;
928 	snd_pcm_t *pcm = device->device_data;
929 
930 	snd_assert(pcm != NULL, return -ENXIO);
931 	down(&register_mutex);
932 	idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
933 	snd_pcm_devices[idx] = NULL;
934 	for (cidx = 0; cidx < 2; cidx++) {
935 		devtype = -1;
936 		switch (cidx) {
937 		case SNDRV_PCM_STREAM_PLAYBACK:
938 			devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
939 			break;
940 		case SNDRV_PCM_STREAM_CAPTURE:
941 			devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
942 			break;
943 		}
944 		snd_unregister_device(devtype, pcm->card, pcm->device);
945 		for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
946 			snd_pcm_timer_done(substream);
947 	}
948 	list_for_each(list, &snd_pcm_notify_list) {
949 		snd_pcm_notify_t *notify;
950 		notify = list_entry(list, snd_pcm_notify_t, list);
951 		notify->n_unregister(pcm);
952 	}
953 	up(&register_mutex);
954 	return snd_pcm_free(pcm);
955 }
956 
957 int snd_pcm_notify(snd_pcm_notify_t *notify, int nfree)
958 {
959 	int idx;
960 
961 	snd_assert(notify != NULL && notify->n_register != NULL && notify->n_unregister != NULL, return -EINVAL);
962 	down(&register_mutex);
963 	if (nfree) {
964 		list_del(&notify->list);
965 		for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
966 			if (snd_pcm_devices[idx] == NULL)
967 				continue;
968 			notify->n_unregister(snd_pcm_devices[idx]);
969 		}
970 	} else {
971 		list_add_tail(&notify->list, &snd_pcm_notify_list);
972 		for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
973 			if (snd_pcm_devices[idx] == NULL)
974 				continue;
975 			notify->n_register(snd_pcm_devices[idx]);
976 		}
977 	}
978 	up(&register_mutex);
979 	return 0;
980 }
981 
982 /*
983  *  Info interface
984  */
985 
986 static void snd_pcm_proc_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
987 {
988 	int idx;
989 	snd_pcm_t *pcm;
990 
991 	down(&register_mutex);
992 	for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
993 		pcm = snd_pcm_devices[idx];
994 		if (pcm == NULL)
995 			continue;
996 		snd_iprintf(buffer, "%02i-%02i: %s : %s", idx / SNDRV_PCM_DEVICES,
997 			    idx % SNDRV_PCM_DEVICES, pcm->id, pcm->name);
998 		if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
999 			snd_iprintf(buffer, " : playback %i", pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
1000 		if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1001 			snd_iprintf(buffer, " : capture %i", pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1002 		snd_iprintf(buffer, "\n");
1003 	}
1004 	up(&register_mutex);
1005 }
1006 
1007 /*
1008  *  ENTRY functions
1009  */
1010 
1011 static snd_info_entry_t *snd_pcm_proc_entry = NULL;
1012 
1013 static int __init alsa_pcm_init(void)
1014 {
1015 	snd_info_entry_t *entry;
1016 
1017 	snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1018 	snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1019 	if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1020 		snd_info_set_text_ops(entry, NULL, SNDRV_CARDS * SNDRV_PCM_DEVICES * 128, snd_pcm_proc_read);
1021 		if (snd_info_register(entry) < 0) {
1022 			snd_info_free_entry(entry);
1023 			entry = NULL;
1024 		}
1025 	}
1026 	snd_pcm_proc_entry = entry;
1027 	return 0;
1028 }
1029 
1030 static void __exit alsa_pcm_exit(void)
1031 {
1032 	snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1033 	snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1034 	if (snd_pcm_proc_entry) {
1035 		snd_info_unregister(snd_pcm_proc_entry);
1036 		snd_pcm_proc_entry = NULL;
1037 	}
1038 }
1039 
1040 module_init(alsa_pcm_init)
1041 module_exit(alsa_pcm_exit)
1042 
1043 EXPORT_SYMBOL(snd_pcm_devices);
1044 EXPORT_SYMBOL(snd_pcm_new);
1045 EXPORT_SYMBOL(snd_pcm_new_stream);
1046 EXPORT_SYMBOL(snd_pcm_notify);
1047 EXPORT_SYMBOL(snd_pcm_open_substream);
1048 EXPORT_SYMBOL(snd_pcm_release_substream);
1049 EXPORT_SYMBOL(snd_pcm_format_name);
1050   /* pcm_native.c */
1051 EXPORT_SYMBOL(snd_pcm_link_rwlock);
1052 #ifdef CONFIG_PM
1053 EXPORT_SYMBOL(snd_pcm_suspend);
1054 EXPORT_SYMBOL(snd_pcm_suspend_all);
1055 #endif
1056 EXPORT_SYMBOL(snd_pcm_kernel_playback_ioctl);
1057 EXPORT_SYMBOL(snd_pcm_kernel_capture_ioctl);
1058 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
1059 EXPORT_SYMBOL(snd_pcm_mmap_data);
1060 #if SNDRV_PCM_INFO_MMAP_IOMEM
1061 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
1062 #endif
1063  /* pcm_misc.c */
1064 EXPORT_SYMBOL(snd_pcm_format_signed);
1065 EXPORT_SYMBOL(snd_pcm_format_unsigned);
1066 EXPORT_SYMBOL(snd_pcm_format_linear);
1067 EXPORT_SYMBOL(snd_pcm_format_little_endian);
1068 EXPORT_SYMBOL(snd_pcm_format_big_endian);
1069 EXPORT_SYMBOL(snd_pcm_format_width);
1070 EXPORT_SYMBOL(snd_pcm_format_physical_width);
1071 EXPORT_SYMBOL(snd_pcm_format_size);
1072 EXPORT_SYMBOL(snd_pcm_format_silence_64);
1073 EXPORT_SYMBOL(snd_pcm_format_set_silence);
1074 EXPORT_SYMBOL(snd_pcm_build_linear_format);
1075 EXPORT_SYMBOL(snd_pcm_limit_hw_rates);
1076