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1 /*
2  *  Digital Audio (PCM) abstract layer
3  *  Copyright (c) by Jaroslav Kysela <perex@perex.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 <linux/mm.h>
23 #include <linux/module.h>
24 #include <linux/file.h>
25 #include <linux/slab.h>
26 #include <linux/time.h>
27 #include <linux/pm_qos.h>
28 #include <linux/io.h>
29 #include <linux/dma-mapping.h>
30 #include <sound/core.h>
31 #include <sound/control.h>
32 #include <sound/info.h>
33 #include <sound/pcm.h>
34 #include <sound/pcm_params.h>
35 #include <sound/timer.h>
36 #include <sound/minors.h>
37 #include <linux/uio.h>
38 
39 /*
40  *  Compatibility
41  */
42 
43 struct snd_pcm_hw_params_old {
44 	unsigned int flags;
45 	unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
46 			   SNDRV_PCM_HW_PARAM_ACCESS + 1];
47 	struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
48 					SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
49 	unsigned int rmask;
50 	unsigned int cmask;
51 	unsigned int info;
52 	unsigned int msbits;
53 	unsigned int rate_num;
54 	unsigned int rate_den;
55 	snd_pcm_uframes_t fifo_size;
56 	unsigned char reserved[64];
57 };
58 
59 #ifdef CONFIG_SND_SUPPORT_OLD_API
60 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
61 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
62 
63 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
64 				      struct snd_pcm_hw_params_old __user * _oparams);
65 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
66 				      struct snd_pcm_hw_params_old __user * _oparams);
67 #endif
68 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
69 
70 /*
71  *
72  */
73 
74 static DEFINE_RWLOCK(snd_pcm_link_rwlock);
75 static DECLARE_RWSEM(snd_pcm_link_rwsem);
76 
77 /* Writer in rwsem may block readers even during its waiting in queue,
78  * and this may lead to a deadlock when the code path takes read sem
79  * twice (e.g. one in snd_pcm_action_nonatomic() and another in
80  * snd_pcm_stream_lock()).  As a (suboptimal) workaround, let writer to
81  * spin until it gets the lock.
82  */
down_write_nonblock(struct rw_semaphore * lock)83 static inline void down_write_nonblock(struct rw_semaphore *lock)
84 {
85 	while (!down_write_trylock(lock))
86 		cond_resched();
87 }
88 
89 /**
90  * snd_pcm_stream_lock - Lock the PCM stream
91  * @substream: PCM substream
92  *
93  * This locks the PCM stream's spinlock or mutex depending on the nonatomic
94  * flag of the given substream.  This also takes the global link rw lock
95  * (or rw sem), too, for avoiding the race with linked streams.
96  */
snd_pcm_stream_lock(struct snd_pcm_substream * substream)97 void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
98 {
99 	if (substream->pcm->nonatomic) {
100 		down_read_nested(&snd_pcm_link_rwsem, SINGLE_DEPTH_NESTING);
101 		mutex_lock(&substream->self_group.mutex);
102 	} else {
103 		read_lock(&snd_pcm_link_rwlock);
104 		spin_lock(&substream->self_group.lock);
105 	}
106 }
107 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock);
108 
109 /**
110  * snd_pcm_stream_lock - Unlock the PCM stream
111  * @substream: PCM substream
112  *
113  * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock().
114  */
snd_pcm_stream_unlock(struct snd_pcm_substream * substream)115 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
116 {
117 	if (substream->pcm->nonatomic) {
118 		mutex_unlock(&substream->self_group.mutex);
119 		up_read(&snd_pcm_link_rwsem);
120 	} else {
121 		spin_unlock(&substream->self_group.lock);
122 		read_unlock(&snd_pcm_link_rwlock);
123 	}
124 }
125 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock);
126 
127 /**
128  * snd_pcm_stream_lock_irq - Lock the PCM stream
129  * @substream: PCM substream
130  *
131  * This locks the PCM stream like snd_pcm_stream_lock() and disables the local
132  * IRQ (only when nonatomic is false).  In nonatomic case, this is identical
133  * as snd_pcm_stream_lock().
134  */
snd_pcm_stream_lock_irq(struct snd_pcm_substream * substream)135 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
136 {
137 	if (!substream->pcm->nonatomic)
138 		local_irq_disable();
139 	snd_pcm_stream_lock(substream);
140 }
141 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);
142 
143 /**
144  * snd_pcm_stream_unlock_irq - Unlock the PCM stream
145  * @substream: PCM substream
146  *
147  * This is a counter-part of snd_pcm_stream_lock_irq().
148  */
snd_pcm_stream_unlock_irq(struct snd_pcm_substream * substream)149 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
150 {
151 	snd_pcm_stream_unlock(substream);
152 	if (!substream->pcm->nonatomic)
153 		local_irq_enable();
154 }
155 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq);
156 
_snd_pcm_stream_lock_irqsave(struct snd_pcm_substream * substream)157 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream)
158 {
159 	unsigned long flags = 0;
160 	if (!substream->pcm->nonatomic)
161 		local_irq_save(flags);
162 	snd_pcm_stream_lock(substream);
163 	return flags;
164 }
165 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave);
166 
167 /**
168  * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream
169  * @substream: PCM substream
170  * @flags: irq flags
171  *
172  * This is a counter-part of snd_pcm_stream_lock_irqsave().
173  */
snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream * substream,unsigned long flags)174 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
175 				      unsigned long flags)
176 {
177 	snd_pcm_stream_unlock(substream);
178 	if (!substream->pcm->nonatomic)
179 		local_irq_restore(flags);
180 }
181 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
182 
snd_enter_user(void)183 static inline mm_segment_t snd_enter_user(void)
184 {
185 	mm_segment_t fs = get_fs();
186 	set_fs(get_ds());
187 	return fs;
188 }
189 
snd_leave_user(mm_segment_t fs)190 static inline void snd_leave_user(mm_segment_t fs)
191 {
192 	set_fs(fs);
193 }
194 
195 
196 
snd_pcm_info(struct snd_pcm_substream * substream,struct snd_pcm_info * info)197 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
198 {
199 	struct snd_pcm_runtime *runtime;
200 	struct snd_pcm *pcm = substream->pcm;
201 	struct snd_pcm_str *pstr = substream->pstr;
202 
203 	memset(info, 0, sizeof(*info));
204 	info->card = pcm->card->number;
205 	info->device = pcm->device;
206 	info->stream = substream->stream;
207 	info->subdevice = substream->number;
208 	strlcpy(info->id, pcm->id, sizeof(info->id));
209 	strlcpy(info->name, pcm->name, sizeof(info->name));
210 	info->dev_class = pcm->dev_class;
211 	info->dev_subclass = pcm->dev_subclass;
212 	info->subdevices_count = pstr->substream_count;
213 	info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
214 	strlcpy(info->subname, substream->name, sizeof(info->subname));
215 	runtime = substream->runtime;
216 	/* AB: FIXME!!! This is definitely nonsense */
217 	if (runtime) {
218 		info->sync = runtime->sync;
219 		substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
220 	}
221 	return 0;
222 }
223 
snd_pcm_info_user(struct snd_pcm_substream * substream,struct snd_pcm_info __user * _info)224 int snd_pcm_info_user(struct snd_pcm_substream *substream,
225 		      struct snd_pcm_info __user * _info)
226 {
227 	struct snd_pcm_info *info;
228 	int err;
229 
230 	info = kmalloc(sizeof(*info), GFP_KERNEL);
231 	if (! info)
232 		return -ENOMEM;
233 	err = snd_pcm_info(substream, info);
234 	if (err >= 0) {
235 		if (copy_to_user(_info, info, sizeof(*info)))
236 			err = -EFAULT;
237 	}
238 	kfree(info);
239 	return err;
240 }
241 
hw_support_mmap(struct snd_pcm_substream * substream)242 static bool hw_support_mmap(struct snd_pcm_substream *substream)
243 {
244 	if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
245 		return false;
246 	/* check architectures that return -EINVAL from dma_mmap_coherent() */
247 	/* FIXME: this should be some global flag */
248 #if defined(CONFIG_C6X) || defined(CONFIG_FRV) || defined(CONFIG_MN10300) ||\
249 	defined(CONFIG_PARISC) || defined(CONFIG_XTENSA)
250 	if (!substream->ops->mmap &&
251 	    substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
252 		return false;
253 #endif
254 	return true;
255 }
256 
257 #undef RULES_DEBUG
258 
259 #ifdef RULES_DEBUG
260 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
261 static const char * const snd_pcm_hw_param_names[] = {
262 	HW_PARAM(ACCESS),
263 	HW_PARAM(FORMAT),
264 	HW_PARAM(SUBFORMAT),
265 	HW_PARAM(SAMPLE_BITS),
266 	HW_PARAM(FRAME_BITS),
267 	HW_PARAM(CHANNELS),
268 	HW_PARAM(RATE),
269 	HW_PARAM(PERIOD_TIME),
270 	HW_PARAM(PERIOD_SIZE),
271 	HW_PARAM(PERIOD_BYTES),
272 	HW_PARAM(PERIODS),
273 	HW_PARAM(BUFFER_TIME),
274 	HW_PARAM(BUFFER_SIZE),
275 	HW_PARAM(BUFFER_BYTES),
276 	HW_PARAM(TICK_TIME),
277 };
278 #endif
279 
snd_pcm_hw_refine(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)280 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
281 		      struct snd_pcm_hw_params *params)
282 {
283 	unsigned int k;
284 	struct snd_pcm_hardware *hw;
285 	struct snd_interval *i = NULL;
286 	struct snd_mask *m = NULL;
287 	struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
288 	unsigned int rstamps[constrs->rules_num];
289 	unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
290 	unsigned int stamp = 2;
291 	int changed, again;
292 
293 	params->info = 0;
294 	params->fifo_size = 0;
295 	if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
296 		params->msbits = 0;
297 	if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
298 		params->rate_num = 0;
299 		params->rate_den = 0;
300 	}
301 
302 	for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
303 		m = hw_param_mask(params, k);
304 		if (snd_mask_empty(m))
305 			return -EINVAL;
306 		if (!(params->rmask & (1 << k)))
307 			continue;
308 #ifdef RULES_DEBUG
309 		pr_debug("%s = ", snd_pcm_hw_param_names[k]);
310 		pr_cont("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
311 #endif
312 		changed = snd_mask_refine(m, constrs_mask(constrs, k));
313 #ifdef RULES_DEBUG
314 		pr_cont("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
315 #endif
316 		if (changed)
317 			params->cmask |= 1 << k;
318 		if (changed < 0)
319 			return changed;
320 	}
321 
322 	for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
323 		i = hw_param_interval(params, k);
324 		if (snd_interval_empty(i))
325 			return -EINVAL;
326 		if (!(params->rmask & (1 << k)))
327 			continue;
328 #ifdef RULES_DEBUG
329 		pr_debug("%s = ", snd_pcm_hw_param_names[k]);
330 		if (i->empty)
331 			pr_cont("empty");
332 		else
333 			pr_cont("%c%u %u%c",
334 			       i->openmin ? '(' : '[', i->min,
335 			       i->max, i->openmax ? ')' : ']');
336 		pr_cont(" -> ");
337 #endif
338 		changed = snd_interval_refine(i, constrs_interval(constrs, k));
339 #ifdef RULES_DEBUG
340 		if (i->empty)
341 			pr_cont("empty\n");
342 		else
343 			pr_cont("%c%u %u%c\n",
344 			       i->openmin ? '(' : '[', i->min,
345 			       i->max, i->openmax ? ')' : ']');
346 #endif
347 		if (changed)
348 			params->cmask |= 1 << k;
349 		if (changed < 0)
350 			return changed;
351 	}
352 
353 	for (k = 0; k < constrs->rules_num; k++)
354 		rstamps[k] = 0;
355 	for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
356 		vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
357 	do {
358 		again = 0;
359 		for (k = 0; k < constrs->rules_num; k++) {
360 			struct snd_pcm_hw_rule *r = &constrs->rules[k];
361 			unsigned int d;
362 			int doit = 0;
363 			if (r->cond && !(r->cond & params->flags))
364 				continue;
365 			for (d = 0; r->deps[d] >= 0; d++) {
366 				if (vstamps[r->deps[d]] > rstamps[k]) {
367 					doit = 1;
368 					break;
369 				}
370 			}
371 			if (!doit)
372 				continue;
373 #ifdef RULES_DEBUG
374 			pr_debug("Rule %d [%p]: ", k, r->func);
375 			if (r->var >= 0) {
376 				pr_cont("%s = ", snd_pcm_hw_param_names[r->var]);
377 				if (hw_is_mask(r->var)) {
378 					m = hw_param_mask(params, r->var);
379 					pr_cont("%x", *m->bits);
380 				} else {
381 					i = hw_param_interval(params, r->var);
382 					if (i->empty)
383 						pr_cont("empty");
384 					else
385 						pr_cont("%c%u %u%c",
386 						       i->openmin ? '(' : '[', i->min,
387 						       i->max, i->openmax ? ')' : ']');
388 				}
389 			}
390 #endif
391 			changed = r->func(params, r);
392 #ifdef RULES_DEBUG
393 			if (r->var >= 0) {
394 				pr_cont(" -> ");
395 				if (hw_is_mask(r->var))
396 					pr_cont("%x", *m->bits);
397 				else {
398 					if (i->empty)
399 						pr_cont("empty");
400 					else
401 						pr_cont("%c%u %u%c",
402 						       i->openmin ? '(' : '[', i->min,
403 						       i->max, i->openmax ? ')' : ']');
404 				}
405 			}
406 			pr_cont("\n");
407 #endif
408 			rstamps[k] = stamp;
409 			if (changed && r->var >= 0) {
410 				params->cmask |= (1 << r->var);
411 				vstamps[r->var] = stamp;
412 				again = 1;
413 			}
414 			if (changed < 0)
415 				return changed;
416 			stamp++;
417 		}
418 	} while (again);
419 	if (!params->msbits) {
420 		i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
421 		if (snd_interval_single(i))
422 			params->msbits = snd_interval_value(i);
423 	}
424 
425 	if (!params->rate_den) {
426 		i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
427 		if (snd_interval_single(i)) {
428 			params->rate_num = snd_interval_value(i);
429 			params->rate_den = 1;
430 		}
431 	}
432 
433 	hw = &substream->runtime->hw;
434 	if (!params->info) {
435 		params->info = hw->info & ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES |
436 					    SNDRV_PCM_INFO_DRAIN_TRIGGER);
437 		if (!hw_support_mmap(substream))
438 			params->info &= ~(SNDRV_PCM_INFO_MMAP |
439 					  SNDRV_PCM_INFO_MMAP_VALID);
440 	}
441 	if (!params->fifo_size) {
442 		m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
443 		i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
444 		if (snd_mask_min(m) == snd_mask_max(m) &&
445                     snd_interval_min(i) == snd_interval_max(i)) {
446 			changed = substream->ops->ioctl(substream,
447 					SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
448 			if (changed < 0)
449 				return changed;
450 		}
451 	}
452 	params->rmask = 0;
453 	return 0;
454 }
455 
456 EXPORT_SYMBOL(snd_pcm_hw_refine);
457 
snd_pcm_hw_refine_user(struct snd_pcm_substream * substream,struct snd_pcm_hw_params __user * _params)458 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
459 				  struct snd_pcm_hw_params __user * _params)
460 {
461 	struct snd_pcm_hw_params *params;
462 	int err;
463 
464 	params = memdup_user(_params, sizeof(*params));
465 	if (IS_ERR(params))
466 		return PTR_ERR(params);
467 
468 	err = snd_pcm_hw_refine(substream, params);
469 	if (copy_to_user(_params, params, sizeof(*params))) {
470 		if (!err)
471 			err = -EFAULT;
472 	}
473 
474 	kfree(params);
475 	return err;
476 }
477 
period_to_usecs(struct snd_pcm_runtime * runtime)478 static int period_to_usecs(struct snd_pcm_runtime *runtime)
479 {
480 	int usecs;
481 
482 	if (! runtime->rate)
483 		return -1; /* invalid */
484 
485 	/* take 75% of period time as the deadline */
486 	usecs = (750000 / runtime->rate) * runtime->period_size;
487 	usecs += ((750000 % runtime->rate) * runtime->period_size) /
488 		runtime->rate;
489 
490 	return usecs;
491 }
492 
snd_pcm_set_state(struct snd_pcm_substream * substream,int state)493 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state)
494 {
495 	snd_pcm_stream_lock_irq(substream);
496 	if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
497 		substream->runtime->status->state = state;
498 	snd_pcm_stream_unlock_irq(substream);
499 }
500 
snd_pcm_timer_notify(struct snd_pcm_substream * substream,int event)501 static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream,
502 					int event)
503 {
504 #ifdef CONFIG_SND_PCM_TIMER
505 	if (substream->timer)
506 		snd_timer_notify(substream->timer, event,
507 					&substream->runtime->trigger_tstamp);
508 #endif
509 }
510 
snd_pcm_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)511 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
512 			     struct snd_pcm_hw_params *params)
513 {
514 	struct snd_pcm_runtime *runtime;
515 	int err, usecs;
516 	unsigned int bits;
517 	snd_pcm_uframes_t frames;
518 
519 	if (PCM_RUNTIME_CHECK(substream))
520 		return -ENXIO;
521 	runtime = substream->runtime;
522 	snd_pcm_stream_lock_irq(substream);
523 	switch (runtime->status->state) {
524 	case SNDRV_PCM_STATE_OPEN:
525 	case SNDRV_PCM_STATE_SETUP:
526 	case SNDRV_PCM_STATE_PREPARED:
527 		break;
528 	default:
529 		snd_pcm_stream_unlock_irq(substream);
530 		return -EBADFD;
531 	}
532 	snd_pcm_stream_unlock_irq(substream);
533 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
534 	if (!substream->oss.oss)
535 #endif
536 		if (atomic_read(&substream->mmap_count))
537 			return -EBADFD;
538 
539 	params->rmask = ~0U;
540 	err = snd_pcm_hw_refine(substream, params);
541 	if (err < 0)
542 		goto _error;
543 
544 	err = snd_pcm_hw_params_choose(substream, params);
545 	if (err < 0)
546 		goto _error;
547 
548 	if (substream->ops->hw_params != NULL) {
549 		err = substream->ops->hw_params(substream, params);
550 		if (err < 0)
551 			goto _error;
552 	}
553 
554 	runtime->access = params_access(params);
555 	runtime->format = params_format(params);
556 	runtime->subformat = params_subformat(params);
557 	runtime->channels = params_channels(params);
558 	runtime->rate = params_rate(params);
559 	runtime->period_size = params_period_size(params);
560 	runtime->periods = params_periods(params);
561 	runtime->buffer_size = params_buffer_size(params);
562 	runtime->info = params->info;
563 	runtime->rate_num = params->rate_num;
564 	runtime->rate_den = params->rate_den;
565 	runtime->no_period_wakeup =
566 			(params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
567 			(params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
568 
569 	bits = snd_pcm_format_physical_width(runtime->format);
570 	runtime->sample_bits = bits;
571 	bits *= runtime->channels;
572 	runtime->frame_bits = bits;
573 	frames = 1;
574 	while (bits % 8 != 0) {
575 		bits *= 2;
576 		frames *= 2;
577 	}
578 	runtime->byte_align = bits / 8;
579 	runtime->min_align = frames;
580 
581 	/* Default sw params */
582 	runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
583 	runtime->period_step = 1;
584 	runtime->control->avail_min = runtime->period_size;
585 	runtime->start_threshold = 1;
586 	runtime->stop_threshold = runtime->buffer_size;
587 	runtime->silence_threshold = 0;
588 	runtime->silence_size = 0;
589 	runtime->boundary = runtime->buffer_size;
590 	while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
591 		runtime->boundary *= 2;
592 
593 	snd_pcm_timer_resolution_change(substream);
594 	snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
595 
596 	if (pm_qos_request_active(&substream->latency_pm_qos_req))
597 		pm_qos_remove_request(&substream->latency_pm_qos_req);
598 	if ((usecs = period_to_usecs(runtime)) >= 0)
599 		pm_qos_add_request(&substream->latency_pm_qos_req,
600 				   PM_QOS_CPU_DMA_LATENCY, usecs);
601 	return 0;
602  _error:
603 	/* hardware might be unusable from this time,
604 	   so we force application to retry to set
605 	   the correct hardware parameter settings */
606 	snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
607 	if (substream->ops->hw_free != NULL)
608 		substream->ops->hw_free(substream);
609 	return err;
610 }
611 
snd_pcm_hw_params_user(struct snd_pcm_substream * substream,struct snd_pcm_hw_params __user * _params)612 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
613 				  struct snd_pcm_hw_params __user * _params)
614 {
615 	struct snd_pcm_hw_params *params;
616 	int err;
617 
618 	params = memdup_user(_params, sizeof(*params));
619 	if (IS_ERR(params))
620 		return PTR_ERR(params);
621 
622 	err = snd_pcm_hw_params(substream, params);
623 	if (copy_to_user(_params, params, sizeof(*params))) {
624 		if (!err)
625 			err = -EFAULT;
626 	}
627 
628 	kfree(params);
629 	return err;
630 }
631 
snd_pcm_hw_free(struct snd_pcm_substream * substream)632 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
633 {
634 	struct snd_pcm_runtime *runtime;
635 	int result = 0;
636 
637 	if (PCM_RUNTIME_CHECK(substream))
638 		return -ENXIO;
639 	runtime = substream->runtime;
640 	snd_pcm_stream_lock_irq(substream);
641 	switch (runtime->status->state) {
642 	case SNDRV_PCM_STATE_SETUP:
643 	case SNDRV_PCM_STATE_PREPARED:
644 		break;
645 	default:
646 		snd_pcm_stream_unlock_irq(substream);
647 		return -EBADFD;
648 	}
649 	snd_pcm_stream_unlock_irq(substream);
650 	if (atomic_read(&substream->mmap_count))
651 		return -EBADFD;
652 	if (substream->ops->hw_free)
653 		result = substream->ops->hw_free(substream);
654 	snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
655 	pm_qos_remove_request(&substream->latency_pm_qos_req);
656 	return result;
657 }
658 
snd_pcm_sw_params(struct snd_pcm_substream * substream,struct snd_pcm_sw_params * params)659 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
660 			     struct snd_pcm_sw_params *params)
661 {
662 	struct snd_pcm_runtime *runtime;
663 	int err;
664 
665 	if (PCM_RUNTIME_CHECK(substream))
666 		return -ENXIO;
667 	runtime = substream->runtime;
668 	snd_pcm_stream_lock_irq(substream);
669 	if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
670 		snd_pcm_stream_unlock_irq(substream);
671 		return -EBADFD;
672 	}
673 	snd_pcm_stream_unlock_irq(substream);
674 
675 	if (params->tstamp_mode < 0 ||
676 	    params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
677 		return -EINVAL;
678 	if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
679 	    params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
680 		return -EINVAL;
681 	if (params->avail_min == 0)
682 		return -EINVAL;
683 	if (params->silence_size >= runtime->boundary) {
684 		if (params->silence_threshold != 0)
685 			return -EINVAL;
686 	} else {
687 		if (params->silence_size > params->silence_threshold)
688 			return -EINVAL;
689 		if (params->silence_threshold > runtime->buffer_size)
690 			return -EINVAL;
691 	}
692 	err = 0;
693 	snd_pcm_stream_lock_irq(substream);
694 	runtime->tstamp_mode = params->tstamp_mode;
695 	if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
696 		runtime->tstamp_type = params->tstamp_type;
697 	runtime->period_step = params->period_step;
698 	runtime->control->avail_min = params->avail_min;
699 	runtime->start_threshold = params->start_threshold;
700 	runtime->stop_threshold = params->stop_threshold;
701 	runtime->silence_threshold = params->silence_threshold;
702 	runtime->silence_size = params->silence_size;
703         params->boundary = runtime->boundary;
704 	if (snd_pcm_running(substream)) {
705 		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
706 		    runtime->silence_size > 0)
707 			snd_pcm_playback_silence(substream, ULONG_MAX);
708 		err = snd_pcm_update_state(substream, runtime);
709 	}
710 	snd_pcm_stream_unlock_irq(substream);
711 	return err;
712 }
713 
snd_pcm_sw_params_user(struct snd_pcm_substream * substream,struct snd_pcm_sw_params __user * _params)714 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
715 				  struct snd_pcm_sw_params __user * _params)
716 {
717 	struct snd_pcm_sw_params params;
718 	int err;
719 	if (copy_from_user(&params, _params, sizeof(params)))
720 		return -EFAULT;
721 	err = snd_pcm_sw_params(substream, &params);
722 	if (copy_to_user(_params, &params, sizeof(params)))
723 		return -EFAULT;
724 	return err;
725 }
726 
snd_pcm_status(struct snd_pcm_substream * substream,struct snd_pcm_status * status)727 int snd_pcm_status(struct snd_pcm_substream *substream,
728 		   struct snd_pcm_status *status)
729 {
730 	struct snd_pcm_runtime *runtime = substream->runtime;
731 
732 	snd_pcm_stream_lock_irq(substream);
733 
734 	snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data,
735 					&runtime->audio_tstamp_config);
736 
737 	/* backwards compatible behavior */
738 	if (runtime->audio_tstamp_config.type_requested ==
739 		SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) {
740 		if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)
741 			runtime->audio_tstamp_config.type_requested =
742 				SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK;
743 		else
744 			runtime->audio_tstamp_config.type_requested =
745 				SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT;
746 		runtime->audio_tstamp_report.valid = 0;
747 	} else
748 		runtime->audio_tstamp_report.valid = 1;
749 
750 	status->state = runtime->status->state;
751 	status->suspended_state = runtime->status->suspended_state;
752 	if (status->state == SNDRV_PCM_STATE_OPEN)
753 		goto _end;
754 	status->trigger_tstamp = runtime->trigger_tstamp;
755 	if (snd_pcm_running(substream)) {
756 		snd_pcm_update_hw_ptr(substream);
757 		if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
758 			status->tstamp = runtime->status->tstamp;
759 			status->driver_tstamp = runtime->driver_tstamp;
760 			status->audio_tstamp =
761 				runtime->status->audio_tstamp;
762 			if (runtime->audio_tstamp_report.valid == 1)
763 				/* backwards compatibility, no report provided in COMPAT mode */
764 				snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data,
765 								&status->audio_tstamp_accuracy,
766 								&runtime->audio_tstamp_report);
767 
768 			goto _tstamp_end;
769 		}
770 	} else {
771 		/* get tstamp only in fallback mode and only if enabled */
772 		if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
773 			snd_pcm_gettime(runtime, &status->tstamp);
774 	}
775  _tstamp_end:
776 	status->appl_ptr = runtime->control->appl_ptr;
777 	status->hw_ptr = runtime->status->hw_ptr;
778 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
779 		status->avail = snd_pcm_playback_avail(runtime);
780 		if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
781 		    runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
782 			status->delay = runtime->buffer_size - status->avail;
783 			status->delay += runtime->delay;
784 		} else
785 			status->delay = 0;
786 	} else {
787 		status->avail = snd_pcm_capture_avail(runtime);
788 		if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
789 			status->delay = status->avail + runtime->delay;
790 		else
791 			status->delay = 0;
792 	}
793 	status->avail_max = runtime->avail_max;
794 	status->overrange = runtime->overrange;
795 	runtime->avail_max = 0;
796 	runtime->overrange = 0;
797  _end:
798  	snd_pcm_stream_unlock_irq(substream);
799 	return 0;
800 }
801 
snd_pcm_status_user(struct snd_pcm_substream * substream,struct snd_pcm_status __user * _status,bool ext)802 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
803 			       struct snd_pcm_status __user * _status,
804 			       bool ext)
805 {
806 	struct snd_pcm_status status;
807 	int res;
808 
809 	memset(&status, 0, sizeof(status));
810 	/*
811 	 * with extension, parameters are read/write,
812 	 * get audio_tstamp_data from user,
813 	 * ignore rest of status structure
814 	 */
815 	if (ext && get_user(status.audio_tstamp_data,
816 				(u32 __user *)(&_status->audio_tstamp_data)))
817 		return -EFAULT;
818 	res = snd_pcm_status(substream, &status);
819 	if (res < 0)
820 		return res;
821 	if (copy_to_user(_status, &status, sizeof(status)))
822 		return -EFAULT;
823 	return 0;
824 }
825 
snd_pcm_channel_info(struct snd_pcm_substream * substream,struct snd_pcm_channel_info * info)826 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
827 				struct snd_pcm_channel_info * info)
828 {
829 	struct snd_pcm_runtime *runtime;
830 	unsigned int channel;
831 
832 	channel = info->channel;
833 	runtime = substream->runtime;
834 	snd_pcm_stream_lock_irq(substream);
835 	if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
836 		snd_pcm_stream_unlock_irq(substream);
837 		return -EBADFD;
838 	}
839 	snd_pcm_stream_unlock_irq(substream);
840 	if (channel >= runtime->channels)
841 		return -EINVAL;
842 	memset(info, 0, sizeof(*info));
843 	info->channel = channel;
844 	return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
845 }
846 
snd_pcm_channel_info_user(struct snd_pcm_substream * substream,struct snd_pcm_channel_info __user * _info)847 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
848 				     struct snd_pcm_channel_info __user * _info)
849 {
850 	struct snd_pcm_channel_info info;
851 	int res;
852 
853 	if (copy_from_user(&info, _info, sizeof(info)))
854 		return -EFAULT;
855 	res = snd_pcm_channel_info(substream, &info);
856 	if (res < 0)
857 		return res;
858 	if (copy_to_user(_info, &info, sizeof(info)))
859 		return -EFAULT;
860 	return 0;
861 }
862 
snd_pcm_trigger_tstamp(struct snd_pcm_substream * substream)863 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
864 {
865 	struct snd_pcm_runtime *runtime = substream->runtime;
866 	if (runtime->trigger_master == NULL)
867 		return;
868 	if (runtime->trigger_master == substream) {
869 		if (!runtime->trigger_tstamp_latched)
870 			snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
871 	} else {
872 		snd_pcm_trigger_tstamp(runtime->trigger_master);
873 		runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
874 	}
875 	runtime->trigger_master = NULL;
876 }
877 
878 struct action_ops {
879 	int (*pre_action)(struct snd_pcm_substream *substream, int state);
880 	int (*do_action)(struct snd_pcm_substream *substream, int state);
881 	void (*undo_action)(struct snd_pcm_substream *substream, int state);
882 	void (*post_action)(struct snd_pcm_substream *substream, int state);
883 };
884 
885 /*
886  *  this functions is core for handling of linked stream
887  *  Note: the stream state might be changed also on failure
888  *  Note2: call with calling stream lock + link lock
889  */
snd_pcm_action_group(const struct action_ops * ops,struct snd_pcm_substream * substream,int state,int do_lock)890 static int snd_pcm_action_group(const struct action_ops *ops,
891 				struct snd_pcm_substream *substream,
892 				int state, int do_lock)
893 {
894 	struct snd_pcm_substream *s = NULL;
895 	struct snd_pcm_substream *s1;
896 	int res = 0, depth = 1;
897 
898 	snd_pcm_group_for_each_entry(s, substream) {
899 		if (do_lock && s != substream) {
900 			if (s->pcm->nonatomic)
901 				mutex_lock_nested(&s->self_group.mutex, depth);
902 			else
903 				spin_lock_nested(&s->self_group.lock, depth);
904 			depth++;
905 		}
906 		res = ops->pre_action(s, state);
907 		if (res < 0)
908 			goto _unlock;
909 	}
910 	snd_pcm_group_for_each_entry(s, substream) {
911 		res = ops->do_action(s, state);
912 		if (res < 0) {
913 			if (ops->undo_action) {
914 				snd_pcm_group_for_each_entry(s1, substream) {
915 					if (s1 == s) /* failed stream */
916 						break;
917 					ops->undo_action(s1, state);
918 				}
919 			}
920 			s = NULL; /* unlock all */
921 			goto _unlock;
922 		}
923 	}
924 	snd_pcm_group_for_each_entry(s, substream) {
925 		ops->post_action(s, state);
926 	}
927  _unlock:
928 	if (do_lock) {
929 		/* unlock streams */
930 		snd_pcm_group_for_each_entry(s1, substream) {
931 			if (s1 != substream) {
932 				if (s1->pcm->nonatomic)
933 					mutex_unlock(&s1->self_group.mutex);
934 				else
935 					spin_unlock(&s1->self_group.lock);
936 			}
937 			if (s1 == s)	/* end */
938 				break;
939 		}
940 	}
941 	return res;
942 }
943 
944 /*
945  *  Note: call with stream lock
946  */
snd_pcm_action_single(const struct action_ops * ops,struct snd_pcm_substream * substream,int state)947 static int snd_pcm_action_single(const struct action_ops *ops,
948 				 struct snd_pcm_substream *substream,
949 				 int state)
950 {
951 	int res;
952 
953 	res = ops->pre_action(substream, state);
954 	if (res < 0)
955 		return res;
956 	res = ops->do_action(substream, state);
957 	if (res == 0)
958 		ops->post_action(substream, state);
959 	else if (ops->undo_action)
960 		ops->undo_action(substream, state);
961 	return res;
962 }
963 
964 /*
965  *  Note: call with stream lock
966  */
snd_pcm_action(const struct action_ops * ops,struct snd_pcm_substream * substream,int state)967 static int snd_pcm_action(const struct action_ops *ops,
968 			  struct snd_pcm_substream *substream,
969 			  int state)
970 {
971 	int res;
972 
973 	if (!snd_pcm_stream_linked(substream))
974 		return snd_pcm_action_single(ops, substream, state);
975 
976 	if (substream->pcm->nonatomic) {
977 		if (!mutex_trylock(&substream->group->mutex)) {
978 			mutex_unlock(&substream->self_group.mutex);
979 			mutex_lock(&substream->group->mutex);
980 			mutex_lock(&substream->self_group.mutex);
981 		}
982 		res = snd_pcm_action_group(ops, substream, state, 1);
983 		mutex_unlock(&substream->group->mutex);
984 	} else {
985 		if (!spin_trylock(&substream->group->lock)) {
986 			spin_unlock(&substream->self_group.lock);
987 			spin_lock(&substream->group->lock);
988 			spin_lock(&substream->self_group.lock);
989 		}
990 		res = snd_pcm_action_group(ops, substream, state, 1);
991 		spin_unlock(&substream->group->lock);
992 	}
993 	return res;
994 }
995 
996 /*
997  *  Note: don't use any locks before
998  */
snd_pcm_action_lock_irq(const struct action_ops * ops,struct snd_pcm_substream * substream,int state)999 static int snd_pcm_action_lock_irq(const struct action_ops *ops,
1000 				   struct snd_pcm_substream *substream,
1001 				   int state)
1002 {
1003 	int res;
1004 
1005 	snd_pcm_stream_lock_irq(substream);
1006 	res = snd_pcm_action(ops, substream, state);
1007 	snd_pcm_stream_unlock_irq(substream);
1008 	return res;
1009 }
1010 
1011 /*
1012  */
snd_pcm_action_nonatomic(const struct action_ops * ops,struct snd_pcm_substream * substream,int state)1013 static int snd_pcm_action_nonatomic(const struct action_ops *ops,
1014 				    struct snd_pcm_substream *substream,
1015 				    int state)
1016 {
1017 	int res;
1018 
1019 	down_read(&snd_pcm_link_rwsem);
1020 	if (snd_pcm_stream_linked(substream))
1021 		res = snd_pcm_action_group(ops, substream, state, 0);
1022 	else
1023 		res = snd_pcm_action_single(ops, substream, state);
1024 	up_read(&snd_pcm_link_rwsem);
1025 	return res;
1026 }
1027 
1028 /*
1029  * start callbacks
1030  */
snd_pcm_pre_start(struct snd_pcm_substream * substream,int state)1031 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
1032 {
1033 	struct snd_pcm_runtime *runtime = substream->runtime;
1034 	if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
1035 		return -EBADFD;
1036 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1037 	    !snd_pcm_playback_data(substream))
1038 		return -EPIPE;
1039 	runtime->trigger_tstamp_latched = false;
1040 	runtime->trigger_master = substream;
1041 	return 0;
1042 }
1043 
snd_pcm_do_start(struct snd_pcm_substream * substream,int state)1044 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
1045 {
1046 	if (substream->runtime->trigger_master != substream)
1047 		return 0;
1048 	return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
1049 }
1050 
snd_pcm_undo_start(struct snd_pcm_substream * substream,int state)1051 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
1052 {
1053 	if (substream->runtime->trigger_master == substream)
1054 		substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1055 }
1056 
snd_pcm_post_start(struct snd_pcm_substream * substream,int state)1057 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
1058 {
1059 	struct snd_pcm_runtime *runtime = substream->runtime;
1060 	snd_pcm_trigger_tstamp(substream);
1061 	runtime->hw_ptr_jiffies = jiffies;
1062 	runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
1063 							    runtime->rate;
1064 	runtime->status->state = state;
1065 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1066 	    runtime->silence_size > 0)
1067 		snd_pcm_playback_silence(substream, ULONG_MAX);
1068 	snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART);
1069 }
1070 
1071 static const struct action_ops snd_pcm_action_start = {
1072 	.pre_action = snd_pcm_pre_start,
1073 	.do_action = snd_pcm_do_start,
1074 	.undo_action = snd_pcm_undo_start,
1075 	.post_action = snd_pcm_post_start
1076 };
1077 
1078 /**
1079  * snd_pcm_start - start all linked streams
1080  * @substream: the PCM substream instance
1081  *
1082  * Return: Zero if successful, or a negative error code.
1083  */
snd_pcm_start(struct snd_pcm_substream * substream)1084 int snd_pcm_start(struct snd_pcm_substream *substream)
1085 {
1086 	return snd_pcm_action(&snd_pcm_action_start, substream,
1087 			      SNDRV_PCM_STATE_RUNNING);
1088 }
1089 
1090 /*
1091  * stop callbacks
1092  */
snd_pcm_pre_stop(struct snd_pcm_substream * substream,int state)1093 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
1094 {
1095 	struct snd_pcm_runtime *runtime = substream->runtime;
1096 	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1097 		return -EBADFD;
1098 	runtime->trigger_master = substream;
1099 	return 0;
1100 }
1101 
snd_pcm_do_stop(struct snd_pcm_substream * substream,int state)1102 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
1103 {
1104 	if (substream->runtime->trigger_master == substream &&
1105 	    snd_pcm_running(substream))
1106 		substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1107 	return 0; /* unconditonally stop all substreams */
1108 }
1109 
snd_pcm_post_stop(struct snd_pcm_substream * substream,int state)1110 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
1111 {
1112 	struct snd_pcm_runtime *runtime = substream->runtime;
1113 	if (runtime->status->state != state) {
1114 		snd_pcm_trigger_tstamp(substream);
1115 		runtime->status->state = state;
1116 		snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP);
1117 	}
1118 	wake_up(&runtime->sleep);
1119 	wake_up(&runtime->tsleep);
1120 }
1121 
1122 static const struct action_ops snd_pcm_action_stop = {
1123 	.pre_action = snd_pcm_pre_stop,
1124 	.do_action = snd_pcm_do_stop,
1125 	.post_action = snd_pcm_post_stop
1126 };
1127 
1128 /**
1129  * snd_pcm_stop - try to stop all running streams in the substream group
1130  * @substream: the PCM substream instance
1131  * @state: PCM state after stopping the stream
1132  *
1133  * The state of each stream is then changed to the given state unconditionally.
1134  *
1135  * Return: Zero if successful, or a negative error code.
1136  */
snd_pcm_stop(struct snd_pcm_substream * substream,snd_pcm_state_t state)1137 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
1138 {
1139 	return snd_pcm_action(&snd_pcm_action_stop, substream, state);
1140 }
1141 
1142 EXPORT_SYMBOL(snd_pcm_stop);
1143 
1144 /**
1145  * snd_pcm_drain_done - stop the DMA only when the given stream is playback
1146  * @substream: the PCM substream
1147  *
1148  * After stopping, the state is changed to SETUP.
1149  * Unlike snd_pcm_stop(), this affects only the given stream.
1150  *
1151  * Return: Zero if succesful, or a negative error code.
1152  */
snd_pcm_drain_done(struct snd_pcm_substream * substream)1153 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
1154 {
1155 	return snd_pcm_action_single(&snd_pcm_action_stop, substream,
1156 				     SNDRV_PCM_STATE_SETUP);
1157 }
1158 
1159 /**
1160  * snd_pcm_stop_xrun - stop the running streams as XRUN
1161  * @substream: the PCM substream instance
1162  *
1163  * This stops the given running substream (and all linked substreams) as XRUN.
1164  * Unlike snd_pcm_stop(), this function takes the substream lock by itself.
1165  *
1166  * Return: Zero if successful, or a negative error code.
1167  */
snd_pcm_stop_xrun(struct snd_pcm_substream * substream)1168 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream)
1169 {
1170 	unsigned long flags;
1171 	int ret = 0;
1172 
1173 	snd_pcm_stream_lock_irqsave(substream, flags);
1174 	if (snd_pcm_running(substream))
1175 		ret = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1176 	snd_pcm_stream_unlock_irqrestore(substream, flags);
1177 	return ret;
1178 }
1179 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);
1180 
1181 /*
1182  * pause callbacks
1183  */
snd_pcm_pre_pause(struct snd_pcm_substream * substream,int push)1184 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
1185 {
1186 	struct snd_pcm_runtime *runtime = substream->runtime;
1187 	if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1188 		return -ENOSYS;
1189 	if (push) {
1190 		if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
1191 			return -EBADFD;
1192 	} else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
1193 		return -EBADFD;
1194 	runtime->trigger_master = substream;
1195 	return 0;
1196 }
1197 
snd_pcm_do_pause(struct snd_pcm_substream * substream,int push)1198 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
1199 {
1200 	if (substream->runtime->trigger_master != substream)
1201 		return 0;
1202 	/* some drivers might use hw_ptr to recover from the pause -
1203 	   update the hw_ptr now */
1204 	if (push)
1205 		snd_pcm_update_hw_ptr(substream);
1206 	/* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1207 	 * a delta between the current jiffies, this gives a large enough
1208 	 * delta, effectively to skip the check once.
1209 	 */
1210 	substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1211 	return substream->ops->trigger(substream,
1212 				       push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1213 					      SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1214 }
1215 
snd_pcm_undo_pause(struct snd_pcm_substream * substream,int push)1216 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1217 {
1218 	if (substream->runtime->trigger_master == substream)
1219 		substream->ops->trigger(substream,
1220 					push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1221 					SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1222 }
1223 
snd_pcm_post_pause(struct snd_pcm_substream * substream,int push)1224 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1225 {
1226 	struct snd_pcm_runtime *runtime = substream->runtime;
1227 	snd_pcm_trigger_tstamp(substream);
1228 	if (push) {
1229 		runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1230 		snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE);
1231 		wake_up(&runtime->sleep);
1232 		wake_up(&runtime->tsleep);
1233 	} else {
1234 		runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1235 		snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE);
1236 	}
1237 }
1238 
1239 static const struct action_ops snd_pcm_action_pause = {
1240 	.pre_action = snd_pcm_pre_pause,
1241 	.do_action = snd_pcm_do_pause,
1242 	.undo_action = snd_pcm_undo_pause,
1243 	.post_action = snd_pcm_post_pause
1244 };
1245 
1246 /*
1247  * Push/release the pause for all linked streams.
1248  */
snd_pcm_pause(struct snd_pcm_substream * substream,int push)1249 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1250 {
1251 	return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1252 }
1253 
1254 #ifdef CONFIG_PM
1255 /* suspend */
1256 
snd_pcm_pre_suspend(struct snd_pcm_substream * substream,int state)1257 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1258 {
1259 	struct snd_pcm_runtime *runtime = substream->runtime;
1260 	if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1261 		return -EBUSY;
1262 	runtime->trigger_master = substream;
1263 	return 0;
1264 }
1265 
snd_pcm_do_suspend(struct snd_pcm_substream * substream,int state)1266 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1267 {
1268 	struct snd_pcm_runtime *runtime = substream->runtime;
1269 	if (runtime->trigger_master != substream)
1270 		return 0;
1271 	if (! snd_pcm_running(substream))
1272 		return 0;
1273 	substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1274 	return 0; /* suspend unconditionally */
1275 }
1276 
snd_pcm_post_suspend(struct snd_pcm_substream * substream,int state)1277 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1278 {
1279 	struct snd_pcm_runtime *runtime = substream->runtime;
1280 	snd_pcm_trigger_tstamp(substream);
1281 	runtime->status->suspended_state = runtime->status->state;
1282 	runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1283 	snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND);
1284 	wake_up(&runtime->sleep);
1285 	wake_up(&runtime->tsleep);
1286 }
1287 
1288 static const struct action_ops snd_pcm_action_suspend = {
1289 	.pre_action = snd_pcm_pre_suspend,
1290 	.do_action = snd_pcm_do_suspend,
1291 	.post_action = snd_pcm_post_suspend
1292 };
1293 
1294 /**
1295  * snd_pcm_suspend - trigger SUSPEND to all linked streams
1296  * @substream: the PCM substream
1297  *
1298  * After this call, all streams are changed to SUSPENDED state.
1299  *
1300  * Return: Zero if successful (or @substream is %NULL), or a negative error
1301  * code.
1302  */
snd_pcm_suspend(struct snd_pcm_substream * substream)1303 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1304 {
1305 	int err;
1306 	unsigned long flags;
1307 
1308 	if (! substream)
1309 		return 0;
1310 
1311 	snd_pcm_stream_lock_irqsave(substream, flags);
1312 	err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1313 	snd_pcm_stream_unlock_irqrestore(substream, flags);
1314 	return err;
1315 }
1316 
1317 EXPORT_SYMBOL(snd_pcm_suspend);
1318 
1319 /**
1320  * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1321  * @pcm: the PCM instance
1322  *
1323  * After this call, all streams are changed to SUSPENDED state.
1324  *
1325  * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1326  */
snd_pcm_suspend_all(struct snd_pcm * pcm)1327 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1328 {
1329 	struct snd_pcm_substream *substream;
1330 	int stream, err = 0;
1331 
1332 	if (! pcm)
1333 		return 0;
1334 
1335 	for (stream = 0; stream < 2; stream++) {
1336 		for (substream = pcm->streams[stream].substream;
1337 		     substream; substream = substream->next) {
1338 			/* FIXME: the open/close code should lock this as well */
1339 			if (substream->runtime == NULL)
1340 				continue;
1341 			err = snd_pcm_suspend(substream);
1342 			if (err < 0 && err != -EBUSY)
1343 				return err;
1344 		}
1345 	}
1346 	return 0;
1347 }
1348 
1349 EXPORT_SYMBOL(snd_pcm_suspend_all);
1350 
1351 /* resume */
1352 
snd_pcm_pre_resume(struct snd_pcm_substream * substream,int state)1353 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1354 {
1355 	struct snd_pcm_runtime *runtime = substream->runtime;
1356 	if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1357 		return -ENOSYS;
1358 	runtime->trigger_master = substream;
1359 	return 0;
1360 }
1361 
snd_pcm_do_resume(struct snd_pcm_substream * substream,int state)1362 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1363 {
1364 	struct snd_pcm_runtime *runtime = substream->runtime;
1365 	if (runtime->trigger_master != substream)
1366 		return 0;
1367 	/* DMA not running previously? */
1368 	if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1369 	    (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1370 	     substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1371 		return 0;
1372 	return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1373 }
1374 
snd_pcm_undo_resume(struct snd_pcm_substream * substream,int state)1375 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1376 {
1377 	if (substream->runtime->trigger_master == substream &&
1378 	    snd_pcm_running(substream))
1379 		substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1380 }
1381 
snd_pcm_post_resume(struct snd_pcm_substream * substream,int state)1382 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1383 {
1384 	struct snd_pcm_runtime *runtime = substream->runtime;
1385 	snd_pcm_trigger_tstamp(substream);
1386 	runtime->status->state = runtime->status->suspended_state;
1387 	snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME);
1388 }
1389 
1390 static const struct action_ops snd_pcm_action_resume = {
1391 	.pre_action = snd_pcm_pre_resume,
1392 	.do_action = snd_pcm_do_resume,
1393 	.undo_action = snd_pcm_undo_resume,
1394 	.post_action = snd_pcm_post_resume
1395 };
1396 
snd_pcm_resume(struct snd_pcm_substream * substream)1397 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1398 {
1399 	struct snd_card *card = substream->pcm->card;
1400 	int res;
1401 
1402 	snd_power_lock(card);
1403 	if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1404 		res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1405 	snd_power_unlock(card);
1406 	return res;
1407 }
1408 
1409 #else
1410 
snd_pcm_resume(struct snd_pcm_substream * substream)1411 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1412 {
1413 	return -ENOSYS;
1414 }
1415 
1416 #endif /* CONFIG_PM */
1417 
1418 /*
1419  * xrun ioctl
1420  *
1421  * Change the RUNNING stream(s) to XRUN state.
1422  */
snd_pcm_xrun(struct snd_pcm_substream * substream)1423 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1424 {
1425 	struct snd_card *card = substream->pcm->card;
1426 	struct snd_pcm_runtime *runtime = substream->runtime;
1427 	int result;
1428 
1429 	snd_power_lock(card);
1430 	if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1431 		result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1432 		if (result < 0)
1433 			goto _unlock;
1434 	}
1435 
1436 	snd_pcm_stream_lock_irq(substream);
1437 	switch (runtime->status->state) {
1438 	case SNDRV_PCM_STATE_XRUN:
1439 		result = 0;	/* already there */
1440 		break;
1441 	case SNDRV_PCM_STATE_RUNNING:
1442 		result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1443 		break;
1444 	default:
1445 		result = -EBADFD;
1446 	}
1447 	snd_pcm_stream_unlock_irq(substream);
1448  _unlock:
1449 	snd_power_unlock(card);
1450 	return result;
1451 }
1452 
1453 /*
1454  * reset ioctl
1455  */
snd_pcm_pre_reset(struct snd_pcm_substream * substream,int state)1456 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1457 {
1458 	struct snd_pcm_runtime *runtime = substream->runtime;
1459 	switch (runtime->status->state) {
1460 	case SNDRV_PCM_STATE_RUNNING:
1461 	case SNDRV_PCM_STATE_PREPARED:
1462 	case SNDRV_PCM_STATE_PAUSED:
1463 	case SNDRV_PCM_STATE_SUSPENDED:
1464 		return 0;
1465 	default:
1466 		return -EBADFD;
1467 	}
1468 }
1469 
snd_pcm_do_reset(struct snd_pcm_substream * substream,int state)1470 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1471 {
1472 	struct snd_pcm_runtime *runtime = substream->runtime;
1473 	int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1474 	if (err < 0)
1475 		return err;
1476 	runtime->hw_ptr_base = 0;
1477 	runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1478 		runtime->status->hw_ptr % runtime->period_size;
1479 	runtime->silence_start = runtime->status->hw_ptr;
1480 	runtime->silence_filled = 0;
1481 	return 0;
1482 }
1483 
snd_pcm_post_reset(struct snd_pcm_substream * substream,int state)1484 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1485 {
1486 	struct snd_pcm_runtime *runtime = substream->runtime;
1487 	runtime->control->appl_ptr = runtime->status->hw_ptr;
1488 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1489 	    runtime->silence_size > 0)
1490 		snd_pcm_playback_silence(substream, ULONG_MAX);
1491 }
1492 
1493 static const struct action_ops snd_pcm_action_reset = {
1494 	.pre_action = snd_pcm_pre_reset,
1495 	.do_action = snd_pcm_do_reset,
1496 	.post_action = snd_pcm_post_reset
1497 };
1498 
snd_pcm_reset(struct snd_pcm_substream * substream)1499 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1500 {
1501 	return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1502 }
1503 
1504 /*
1505  * prepare ioctl
1506  */
1507 /* we use the second argument for updating f_flags */
snd_pcm_pre_prepare(struct snd_pcm_substream * substream,int f_flags)1508 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1509 			       int f_flags)
1510 {
1511 	struct snd_pcm_runtime *runtime = substream->runtime;
1512 	if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1513 	    runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1514 		return -EBADFD;
1515 	if (snd_pcm_running(substream))
1516 		return -EBUSY;
1517 	substream->f_flags = f_flags;
1518 	return 0;
1519 }
1520 
snd_pcm_do_prepare(struct snd_pcm_substream * substream,int state)1521 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1522 {
1523 	int err;
1524 	err = substream->ops->prepare(substream);
1525 	if (err < 0)
1526 		return err;
1527 	return snd_pcm_do_reset(substream, 0);
1528 }
1529 
snd_pcm_post_prepare(struct snd_pcm_substream * substream,int state)1530 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1531 {
1532 	struct snd_pcm_runtime *runtime = substream->runtime;
1533 	runtime->control->appl_ptr = runtime->status->hw_ptr;
1534 	snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1535 }
1536 
1537 static const struct action_ops snd_pcm_action_prepare = {
1538 	.pre_action = snd_pcm_pre_prepare,
1539 	.do_action = snd_pcm_do_prepare,
1540 	.post_action = snd_pcm_post_prepare
1541 };
1542 
1543 /**
1544  * snd_pcm_prepare - prepare the PCM substream to be triggerable
1545  * @substream: the PCM substream instance
1546  * @file: file to refer f_flags
1547  *
1548  * Return: Zero if successful, or a negative error code.
1549  */
snd_pcm_prepare(struct snd_pcm_substream * substream,struct file * file)1550 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1551 			   struct file *file)
1552 {
1553 	int res;
1554 	struct snd_card *card = substream->pcm->card;
1555 	int f_flags;
1556 
1557 	if (file)
1558 		f_flags = file->f_flags;
1559 	else
1560 		f_flags = substream->f_flags;
1561 
1562 	snd_power_lock(card);
1563 	if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1564 		res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1565 					       substream, f_flags);
1566 	snd_power_unlock(card);
1567 	return res;
1568 }
1569 
1570 /*
1571  * drain ioctl
1572  */
1573 
snd_pcm_pre_drain_init(struct snd_pcm_substream * substream,int state)1574 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1575 {
1576 	struct snd_pcm_runtime *runtime = substream->runtime;
1577 	switch (runtime->status->state) {
1578 	case SNDRV_PCM_STATE_OPEN:
1579 	case SNDRV_PCM_STATE_DISCONNECTED:
1580 	case SNDRV_PCM_STATE_SUSPENDED:
1581 		return -EBADFD;
1582 	}
1583 	runtime->trigger_master = substream;
1584 	return 0;
1585 }
1586 
snd_pcm_do_drain_init(struct snd_pcm_substream * substream,int state)1587 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1588 {
1589 	struct snd_pcm_runtime *runtime = substream->runtime;
1590 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1591 		switch (runtime->status->state) {
1592 		case SNDRV_PCM_STATE_PREPARED:
1593 			/* start playback stream if possible */
1594 			if (! snd_pcm_playback_empty(substream)) {
1595 				snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1596 				snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1597 			} else {
1598 				runtime->status->state = SNDRV_PCM_STATE_SETUP;
1599 			}
1600 			break;
1601 		case SNDRV_PCM_STATE_RUNNING:
1602 			runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1603 			break;
1604 		case SNDRV_PCM_STATE_XRUN:
1605 			runtime->status->state = SNDRV_PCM_STATE_SETUP;
1606 			break;
1607 		default:
1608 			break;
1609 		}
1610 	} else {
1611 		/* stop running stream */
1612 		if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1613 			int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1614 				SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1615 			snd_pcm_do_stop(substream, new_state);
1616 			snd_pcm_post_stop(substream, new_state);
1617 		}
1618 	}
1619 
1620 	if (runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
1621 	    runtime->trigger_master == substream &&
1622 	    (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
1623 		return substream->ops->trigger(substream,
1624 					       SNDRV_PCM_TRIGGER_DRAIN);
1625 
1626 	return 0;
1627 }
1628 
snd_pcm_post_drain_init(struct snd_pcm_substream * substream,int state)1629 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1630 {
1631 }
1632 
1633 static const struct action_ops snd_pcm_action_drain_init = {
1634 	.pre_action = snd_pcm_pre_drain_init,
1635 	.do_action = snd_pcm_do_drain_init,
1636 	.post_action = snd_pcm_post_drain_init
1637 };
1638 
1639 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1640 
1641 /*
1642  * Drain the stream(s).
1643  * When the substream is linked, sync until the draining of all playback streams
1644  * is finished.
1645  * After this call, all streams are supposed to be either SETUP or DRAINING
1646  * (capture only) state.
1647  */
snd_pcm_drain(struct snd_pcm_substream * substream,struct file * file)1648 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1649 			 struct file *file)
1650 {
1651 	struct snd_card *card;
1652 	struct snd_pcm_runtime *runtime;
1653 	struct snd_pcm_substream *s;
1654 	wait_queue_t wait;
1655 	int result = 0;
1656 	int nonblock = 0;
1657 
1658 	card = substream->pcm->card;
1659 	runtime = substream->runtime;
1660 
1661 	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1662 		return -EBADFD;
1663 
1664 	snd_power_lock(card);
1665 	if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1666 		result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1667 		if (result < 0) {
1668 			snd_power_unlock(card);
1669 			return result;
1670 		}
1671 	}
1672 
1673 	if (file) {
1674 		if (file->f_flags & O_NONBLOCK)
1675 			nonblock = 1;
1676 	} else if (substream->f_flags & O_NONBLOCK)
1677 		nonblock = 1;
1678 
1679 	down_read(&snd_pcm_link_rwsem);
1680 	snd_pcm_stream_lock_irq(substream);
1681 	/* resume pause */
1682 	if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1683 		snd_pcm_pause(substream, 0);
1684 
1685 	/* pre-start/stop - all running streams are changed to DRAINING state */
1686 	result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1687 	if (result < 0)
1688 		goto unlock;
1689 	/* in non-blocking, we don't wait in ioctl but let caller poll */
1690 	if (nonblock) {
1691 		result = -EAGAIN;
1692 		goto unlock;
1693 	}
1694 
1695 	for (;;) {
1696 		long tout;
1697 		struct snd_pcm_runtime *to_check;
1698 		if (signal_pending(current)) {
1699 			result = -ERESTARTSYS;
1700 			break;
1701 		}
1702 		/* find a substream to drain */
1703 		to_check = NULL;
1704 		snd_pcm_group_for_each_entry(s, substream) {
1705 			if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1706 				continue;
1707 			runtime = s->runtime;
1708 			if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1709 				to_check = runtime;
1710 				break;
1711 			}
1712 		}
1713 		if (!to_check)
1714 			break; /* all drained */
1715 		init_waitqueue_entry(&wait, current);
1716 		add_wait_queue(&to_check->sleep, &wait);
1717 		snd_pcm_stream_unlock_irq(substream);
1718 		up_read(&snd_pcm_link_rwsem);
1719 		snd_power_unlock(card);
1720 		if (runtime->no_period_wakeup)
1721 			tout = MAX_SCHEDULE_TIMEOUT;
1722 		else {
1723 			tout = 10;
1724 			if (runtime->rate) {
1725 				long t = runtime->period_size * 2 / runtime->rate;
1726 				tout = max(t, tout);
1727 			}
1728 			tout = msecs_to_jiffies(tout * 1000);
1729 		}
1730 		tout = schedule_timeout_interruptible(tout);
1731 		snd_power_lock(card);
1732 		down_read(&snd_pcm_link_rwsem);
1733 		snd_pcm_stream_lock_irq(substream);
1734 		remove_wait_queue(&to_check->sleep, &wait);
1735 		if (card->shutdown) {
1736 			result = -ENODEV;
1737 			break;
1738 		}
1739 		if (tout == 0) {
1740 			if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1741 				result = -ESTRPIPE;
1742 			else {
1743 				dev_dbg(substream->pcm->card->dev,
1744 					"playback drain error (DMA or IRQ trouble?)\n");
1745 				snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1746 				result = -EIO;
1747 			}
1748 			break;
1749 		}
1750 	}
1751 
1752  unlock:
1753 	snd_pcm_stream_unlock_irq(substream);
1754 	up_read(&snd_pcm_link_rwsem);
1755 	snd_power_unlock(card);
1756 
1757 	return result;
1758 }
1759 
1760 /*
1761  * drop ioctl
1762  *
1763  * Immediately put all linked substreams into SETUP state.
1764  */
snd_pcm_drop(struct snd_pcm_substream * substream)1765 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1766 {
1767 	struct snd_pcm_runtime *runtime;
1768 	int result = 0;
1769 
1770 	if (PCM_RUNTIME_CHECK(substream))
1771 		return -ENXIO;
1772 	runtime = substream->runtime;
1773 
1774 	if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1775 	    runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1776 	    runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1777 		return -EBADFD;
1778 
1779 	snd_pcm_stream_lock_irq(substream);
1780 	/* resume pause */
1781 	if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1782 		snd_pcm_pause(substream, 0);
1783 
1784 	snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1785 	/* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1786 	snd_pcm_stream_unlock_irq(substream);
1787 
1788 	return result;
1789 }
1790 
1791 
is_pcm_file(struct file * file)1792 static bool is_pcm_file(struct file *file)
1793 {
1794 	struct inode *inode = file_inode(file);
1795 	unsigned int minor;
1796 
1797 	if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
1798 		return false;
1799 	minor = iminor(inode);
1800 	return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) ||
1801 		snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
1802 }
1803 
1804 /*
1805  * PCM link handling
1806  */
snd_pcm_link(struct snd_pcm_substream * substream,int fd)1807 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1808 {
1809 	int res = 0;
1810 	struct snd_pcm_file *pcm_file;
1811 	struct snd_pcm_substream *substream1;
1812 	struct snd_pcm_group *group;
1813 	struct fd f = fdget(fd);
1814 
1815 	if (!f.file)
1816 		return -EBADFD;
1817 	if (!is_pcm_file(f.file)) {
1818 		res = -EBADFD;
1819 		goto _badf;
1820 	}
1821 	pcm_file = f.file->private_data;
1822 	substream1 = pcm_file->substream;
1823 	group = kmalloc(sizeof(*group), GFP_KERNEL);
1824 	if (!group) {
1825 		res = -ENOMEM;
1826 		goto _nolock;
1827 	}
1828 	down_write_nonblock(&snd_pcm_link_rwsem);
1829 	write_lock_irq(&snd_pcm_link_rwlock);
1830 	if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1831 	    substream->runtime->status->state != substream1->runtime->status->state ||
1832 	    substream->pcm->nonatomic != substream1->pcm->nonatomic) {
1833 		res = -EBADFD;
1834 		goto _end;
1835 	}
1836 	if (snd_pcm_stream_linked(substream1)) {
1837 		res = -EALREADY;
1838 		goto _end;
1839 	}
1840 	if (!snd_pcm_stream_linked(substream)) {
1841 		substream->group = group;
1842 		group = NULL;
1843 		spin_lock_init(&substream->group->lock);
1844 		mutex_init(&substream->group->mutex);
1845 		INIT_LIST_HEAD(&substream->group->substreams);
1846 		list_add_tail(&substream->link_list, &substream->group->substreams);
1847 		substream->group->count = 1;
1848 	}
1849 	list_add_tail(&substream1->link_list, &substream->group->substreams);
1850 	substream->group->count++;
1851 	substream1->group = substream->group;
1852  _end:
1853 	write_unlock_irq(&snd_pcm_link_rwlock);
1854 	up_write(&snd_pcm_link_rwsem);
1855  _nolock:
1856 	snd_card_unref(substream1->pcm->card);
1857 	kfree(group);
1858  _badf:
1859 	fdput(f);
1860 	return res;
1861 }
1862 
relink_to_local(struct snd_pcm_substream * substream)1863 static void relink_to_local(struct snd_pcm_substream *substream)
1864 {
1865 	substream->group = &substream->self_group;
1866 	INIT_LIST_HEAD(&substream->self_group.substreams);
1867 	list_add_tail(&substream->link_list, &substream->self_group.substreams);
1868 }
1869 
snd_pcm_unlink(struct snd_pcm_substream * substream)1870 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1871 {
1872 	struct snd_pcm_substream *s;
1873 	int res = 0;
1874 
1875 	down_write_nonblock(&snd_pcm_link_rwsem);
1876 	write_lock_irq(&snd_pcm_link_rwlock);
1877 	if (!snd_pcm_stream_linked(substream)) {
1878 		res = -EALREADY;
1879 		goto _end;
1880 	}
1881 	list_del(&substream->link_list);
1882 	substream->group->count--;
1883 	if (substream->group->count == 1) {	/* detach the last stream, too */
1884 		snd_pcm_group_for_each_entry(s, substream) {
1885 			relink_to_local(s);
1886 			break;
1887 		}
1888 		kfree(substream->group);
1889 	}
1890 	relink_to_local(substream);
1891        _end:
1892 	write_unlock_irq(&snd_pcm_link_rwlock);
1893 	up_write(&snd_pcm_link_rwsem);
1894 	return res;
1895 }
1896 
1897 /*
1898  * hw configurator
1899  */
snd_pcm_hw_rule_mul(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)1900 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1901 			       struct snd_pcm_hw_rule *rule)
1902 {
1903 	struct snd_interval t;
1904 	snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1905 		     hw_param_interval_c(params, rule->deps[1]), &t);
1906 	return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1907 }
1908 
snd_pcm_hw_rule_div(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)1909 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1910 			       struct snd_pcm_hw_rule *rule)
1911 {
1912 	struct snd_interval t;
1913 	snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1914 		     hw_param_interval_c(params, rule->deps[1]), &t);
1915 	return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1916 }
1917 
snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)1918 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1919 				   struct snd_pcm_hw_rule *rule)
1920 {
1921 	struct snd_interval t;
1922 	snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1923 			 hw_param_interval_c(params, rule->deps[1]),
1924 			 (unsigned long) rule->private, &t);
1925 	return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1926 }
1927 
snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)1928 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1929 				   struct snd_pcm_hw_rule *rule)
1930 {
1931 	struct snd_interval t;
1932 	snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1933 			 (unsigned long) rule->private,
1934 			 hw_param_interval_c(params, rule->deps[1]), &t);
1935 	return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1936 }
1937 
snd_pcm_hw_rule_format(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)1938 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1939 				  struct snd_pcm_hw_rule *rule)
1940 {
1941 	unsigned int k;
1942 	struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1943 	struct snd_mask m;
1944 	struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1945 	snd_mask_any(&m);
1946 	for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1947 		int bits;
1948 		if (! snd_mask_test(mask, k))
1949 			continue;
1950 		bits = snd_pcm_format_physical_width(k);
1951 		if (bits <= 0)
1952 			continue; /* ignore invalid formats */
1953 		if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1954 			snd_mask_reset(&m, k);
1955 	}
1956 	return snd_mask_refine(mask, &m);
1957 }
1958 
snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)1959 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1960 				       struct snd_pcm_hw_rule *rule)
1961 {
1962 	struct snd_interval t;
1963 	unsigned int k;
1964 	t.min = UINT_MAX;
1965 	t.max = 0;
1966 	t.openmin = 0;
1967 	t.openmax = 0;
1968 	for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1969 		int bits;
1970 		if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1971 			continue;
1972 		bits = snd_pcm_format_physical_width(k);
1973 		if (bits <= 0)
1974 			continue; /* ignore invalid formats */
1975 		if (t.min > (unsigned)bits)
1976 			t.min = bits;
1977 		if (t.max < (unsigned)bits)
1978 			t.max = bits;
1979 	}
1980 	t.integer = 1;
1981 	return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1982 }
1983 
1984 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1985 #error "Change this table"
1986 #endif
1987 
1988 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1989                                  48000, 64000, 88200, 96000, 176400, 192000 };
1990 
1991 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1992 	.count = ARRAY_SIZE(rates),
1993 	.list = rates,
1994 };
1995 
snd_pcm_hw_rule_rate(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)1996 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1997 				struct snd_pcm_hw_rule *rule)
1998 {
1999 	struct snd_pcm_hardware *hw = rule->private;
2000 	return snd_interval_list(hw_param_interval(params, rule->var),
2001 				 snd_pcm_known_rates.count,
2002 				 snd_pcm_known_rates.list, hw->rates);
2003 }
2004 
snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)2005 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
2006 					    struct snd_pcm_hw_rule *rule)
2007 {
2008 	struct snd_interval t;
2009 	struct snd_pcm_substream *substream = rule->private;
2010 	t.min = 0;
2011 	t.max = substream->buffer_bytes_max;
2012 	t.openmin = 0;
2013 	t.openmax = 0;
2014 	t.integer = 1;
2015 	return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2016 }
2017 
snd_pcm_hw_constraints_init(struct snd_pcm_substream * substream)2018 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
2019 {
2020 	struct snd_pcm_runtime *runtime = substream->runtime;
2021 	struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
2022 	int k, err;
2023 
2024 	for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
2025 		snd_mask_any(constrs_mask(constrs, k));
2026 	}
2027 
2028 	for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
2029 		snd_interval_any(constrs_interval(constrs, k));
2030 	}
2031 
2032 	snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
2033 	snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
2034 	snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
2035 	snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
2036 	snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
2037 
2038 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
2039 				   snd_pcm_hw_rule_format, NULL,
2040 				   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2041 	if (err < 0)
2042 		return err;
2043 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2044 				  snd_pcm_hw_rule_sample_bits, NULL,
2045 				  SNDRV_PCM_HW_PARAM_FORMAT,
2046 				  SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2047 	if (err < 0)
2048 		return err;
2049 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2050 				  snd_pcm_hw_rule_div, NULL,
2051 				  SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2052 	if (err < 0)
2053 		return err;
2054 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2055 				  snd_pcm_hw_rule_mul, NULL,
2056 				  SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2057 	if (err < 0)
2058 		return err;
2059 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2060 				  snd_pcm_hw_rule_mulkdiv, (void*) 8,
2061 				  SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2062 	if (err < 0)
2063 		return err;
2064 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2065 				  snd_pcm_hw_rule_mulkdiv, (void*) 8,
2066 				  SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
2067 	if (err < 0)
2068 		return err;
2069 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
2070 				  snd_pcm_hw_rule_div, NULL,
2071 				  SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2072 	if (err < 0)
2073 		return err;
2074 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2075 				  snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2076 				  SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
2077 	if (err < 0)
2078 		return err;
2079 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2080 				  snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2081 				  SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
2082 	if (err < 0)
2083 		return err;
2084 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
2085 				  snd_pcm_hw_rule_div, NULL,
2086 				  SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2087 	if (err < 0)
2088 		return err;
2089 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2090 				  snd_pcm_hw_rule_div, NULL,
2091 				  SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2092 	if (err < 0)
2093 		return err;
2094 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2095 				  snd_pcm_hw_rule_mulkdiv, (void*) 8,
2096 				  SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2097 	if (err < 0)
2098 		return err;
2099 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2100 				  snd_pcm_hw_rule_muldivk, (void*) 1000000,
2101 				  SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2102 	if (err < 0)
2103 		return err;
2104 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2105 				  snd_pcm_hw_rule_mul, NULL,
2106 				  SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2107 	if (err < 0)
2108 		return err;
2109 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2110 				  snd_pcm_hw_rule_mulkdiv, (void*) 8,
2111 				  SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2112 	if (err < 0)
2113 		return err;
2114 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2115 				  snd_pcm_hw_rule_muldivk, (void*) 1000000,
2116 				  SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2117 	if (err < 0)
2118 		return err;
2119 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2120 				  snd_pcm_hw_rule_muldivk, (void*) 8,
2121 				  SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2122 	if (err < 0)
2123 		return err;
2124 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2125 				  snd_pcm_hw_rule_muldivk, (void*) 8,
2126 				  SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2127 	if (err < 0)
2128 		return err;
2129 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
2130 				  snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2131 				  SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2132 	if (err < 0)
2133 		return err;
2134 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
2135 				  snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2136 				  SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2137 	if (err < 0)
2138 		return err;
2139 	return 0;
2140 }
2141 
snd_pcm_hw_constraints_complete(struct snd_pcm_substream * substream)2142 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
2143 {
2144 	struct snd_pcm_runtime *runtime = substream->runtime;
2145 	struct snd_pcm_hardware *hw = &runtime->hw;
2146 	int err;
2147 	unsigned int mask = 0;
2148 
2149         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2150 		mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
2151         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2152 		mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
2153 	if (hw_support_mmap(substream)) {
2154 		if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2155 			mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2156 		if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2157 			mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
2158 		if (hw->info & SNDRV_PCM_INFO_COMPLEX)
2159 			mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
2160 	}
2161 	err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
2162 	if (err < 0)
2163 		return err;
2164 
2165 	err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2166 	if (err < 0)
2167 		return err;
2168 
2169 	err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
2170 	if (err < 0)
2171 		return err;
2172 
2173 	err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
2174 					   hw->channels_min, hw->channels_max);
2175 	if (err < 0)
2176 		return err;
2177 
2178 	err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
2179 					   hw->rate_min, hw->rate_max);
2180 	if (err < 0)
2181 		return err;
2182 
2183 	err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2184 					   hw->period_bytes_min, hw->period_bytes_max);
2185 	if (err < 0)
2186 		return err;
2187 
2188 	err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
2189 					   hw->periods_min, hw->periods_max);
2190 	if (err < 0)
2191 		return err;
2192 
2193 	err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2194 					   hw->period_bytes_min, hw->buffer_bytes_max);
2195 	if (err < 0)
2196 		return err;
2197 
2198 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2199 				  snd_pcm_hw_rule_buffer_bytes_max, substream,
2200 				  SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2201 	if (err < 0)
2202 		return err;
2203 
2204 	/* FIXME: remove */
2205 	if (runtime->dma_bytes) {
2206 		err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2207 		if (err < 0)
2208 			return err;
2209 	}
2210 
2211 	if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2212 		err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2213 					  snd_pcm_hw_rule_rate, hw,
2214 					  SNDRV_PCM_HW_PARAM_RATE, -1);
2215 		if (err < 0)
2216 			return err;
2217 	}
2218 
2219 	/* FIXME: this belong to lowlevel */
2220 	snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2221 
2222 	return 0;
2223 }
2224 
pcm_release_private(struct snd_pcm_substream * substream)2225 static void pcm_release_private(struct snd_pcm_substream *substream)
2226 {
2227 	snd_pcm_unlink(substream);
2228 }
2229 
snd_pcm_release_substream(struct snd_pcm_substream * substream)2230 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2231 {
2232 	substream->ref_count--;
2233 	if (substream->ref_count > 0)
2234 		return;
2235 
2236 	snd_pcm_drop(substream);
2237 	if (substream->hw_opened) {
2238 		if (substream->ops->hw_free &&
2239 		    substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
2240 			substream->ops->hw_free(substream);
2241 		substream->ops->close(substream);
2242 		substream->hw_opened = 0;
2243 	}
2244 	if (pm_qos_request_active(&substream->latency_pm_qos_req))
2245 		pm_qos_remove_request(&substream->latency_pm_qos_req);
2246 	if (substream->pcm_release) {
2247 		substream->pcm_release(substream);
2248 		substream->pcm_release = NULL;
2249 	}
2250 	snd_pcm_detach_substream(substream);
2251 }
2252 
2253 EXPORT_SYMBOL(snd_pcm_release_substream);
2254 
snd_pcm_open_substream(struct snd_pcm * pcm,int stream,struct file * file,struct snd_pcm_substream ** rsubstream)2255 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2256 			   struct file *file,
2257 			   struct snd_pcm_substream **rsubstream)
2258 {
2259 	struct snd_pcm_substream *substream;
2260 	int err;
2261 
2262 	err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2263 	if (err < 0)
2264 		return err;
2265 	if (substream->ref_count > 1) {
2266 		*rsubstream = substream;
2267 		return 0;
2268 	}
2269 
2270 	err = snd_pcm_hw_constraints_init(substream);
2271 	if (err < 0) {
2272 		pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2273 		goto error;
2274 	}
2275 
2276 	if ((err = substream->ops->open(substream)) < 0)
2277 		goto error;
2278 
2279 	substream->hw_opened = 1;
2280 
2281 	err = snd_pcm_hw_constraints_complete(substream);
2282 	if (err < 0) {
2283 		pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2284 		goto error;
2285 	}
2286 
2287 	*rsubstream = substream;
2288 	return 0;
2289 
2290  error:
2291 	snd_pcm_release_substream(substream);
2292 	return err;
2293 }
2294 
2295 EXPORT_SYMBOL(snd_pcm_open_substream);
2296 
snd_pcm_open_file(struct file * file,struct snd_pcm * pcm,int stream)2297 static int snd_pcm_open_file(struct file *file,
2298 			     struct snd_pcm *pcm,
2299 			     int stream)
2300 {
2301 	struct snd_pcm_file *pcm_file;
2302 	struct snd_pcm_substream *substream;
2303 	int err;
2304 
2305 	err = snd_pcm_open_substream(pcm, stream, file, &substream);
2306 	if (err < 0)
2307 		return err;
2308 
2309 	pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2310 	if (pcm_file == NULL) {
2311 		snd_pcm_release_substream(substream);
2312 		return -ENOMEM;
2313 	}
2314 	pcm_file->substream = substream;
2315 	if (substream->ref_count == 1) {
2316 		substream->file = pcm_file;
2317 		substream->pcm_release = pcm_release_private;
2318 	}
2319 	file->private_data = pcm_file;
2320 
2321 	return 0;
2322 }
2323 
snd_pcm_playback_open(struct inode * inode,struct file * file)2324 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2325 {
2326 	struct snd_pcm *pcm;
2327 	int err = nonseekable_open(inode, file);
2328 	if (err < 0)
2329 		return err;
2330 	pcm = snd_lookup_minor_data(iminor(inode),
2331 				    SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2332 	err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2333 	if (pcm)
2334 		snd_card_unref(pcm->card);
2335 	return err;
2336 }
2337 
snd_pcm_capture_open(struct inode * inode,struct file * file)2338 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2339 {
2340 	struct snd_pcm *pcm;
2341 	int err = nonseekable_open(inode, file);
2342 	if (err < 0)
2343 		return err;
2344 	pcm = snd_lookup_minor_data(iminor(inode),
2345 				    SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2346 	err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2347 	if (pcm)
2348 		snd_card_unref(pcm->card);
2349 	return err;
2350 }
2351 
snd_pcm_open(struct file * file,struct snd_pcm * pcm,int stream)2352 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2353 {
2354 	int err;
2355 	wait_queue_t wait;
2356 
2357 	if (pcm == NULL) {
2358 		err = -ENODEV;
2359 		goto __error1;
2360 	}
2361 	err = snd_card_file_add(pcm->card, file);
2362 	if (err < 0)
2363 		goto __error1;
2364 	if (!try_module_get(pcm->card->module)) {
2365 		err = -EFAULT;
2366 		goto __error2;
2367 	}
2368 	init_waitqueue_entry(&wait, current);
2369 	add_wait_queue(&pcm->open_wait, &wait);
2370 	mutex_lock(&pcm->open_mutex);
2371 	while (1) {
2372 		err = snd_pcm_open_file(file, pcm, stream);
2373 		if (err >= 0)
2374 			break;
2375 		if (err == -EAGAIN) {
2376 			if (file->f_flags & O_NONBLOCK) {
2377 				err = -EBUSY;
2378 				break;
2379 			}
2380 		} else
2381 			break;
2382 		set_current_state(TASK_INTERRUPTIBLE);
2383 		mutex_unlock(&pcm->open_mutex);
2384 		schedule();
2385 		mutex_lock(&pcm->open_mutex);
2386 		if (pcm->card->shutdown) {
2387 			err = -ENODEV;
2388 			break;
2389 		}
2390 		if (signal_pending(current)) {
2391 			err = -ERESTARTSYS;
2392 			break;
2393 		}
2394 	}
2395 	remove_wait_queue(&pcm->open_wait, &wait);
2396 	mutex_unlock(&pcm->open_mutex);
2397 	if (err < 0)
2398 		goto __error;
2399 	return err;
2400 
2401       __error:
2402 	module_put(pcm->card->module);
2403       __error2:
2404       	snd_card_file_remove(pcm->card, file);
2405       __error1:
2406       	return err;
2407 }
2408 
snd_pcm_release(struct inode * inode,struct file * file)2409 static int snd_pcm_release(struct inode *inode, struct file *file)
2410 {
2411 	struct snd_pcm *pcm;
2412 	struct snd_pcm_substream *substream;
2413 	struct snd_pcm_file *pcm_file;
2414 
2415 	pcm_file = file->private_data;
2416 	substream = pcm_file->substream;
2417 	if (snd_BUG_ON(!substream))
2418 		return -ENXIO;
2419 	pcm = substream->pcm;
2420 	mutex_lock(&pcm->open_mutex);
2421 	snd_pcm_release_substream(substream);
2422 	kfree(pcm_file);
2423 	mutex_unlock(&pcm->open_mutex);
2424 	wake_up(&pcm->open_wait);
2425 	module_put(pcm->card->module);
2426 	snd_card_file_remove(pcm->card, file);
2427 	return 0;
2428 }
2429 
snd_pcm_playback_rewind(struct snd_pcm_substream * substream,snd_pcm_uframes_t frames)2430 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2431 						 snd_pcm_uframes_t frames)
2432 {
2433 	struct snd_pcm_runtime *runtime = substream->runtime;
2434 	snd_pcm_sframes_t appl_ptr;
2435 	snd_pcm_sframes_t ret;
2436 	snd_pcm_sframes_t hw_avail;
2437 
2438 	if (frames == 0)
2439 		return 0;
2440 
2441 	snd_pcm_stream_lock_irq(substream);
2442 	switch (runtime->status->state) {
2443 	case SNDRV_PCM_STATE_PREPARED:
2444 		break;
2445 	case SNDRV_PCM_STATE_DRAINING:
2446 	case SNDRV_PCM_STATE_RUNNING:
2447 		if (snd_pcm_update_hw_ptr(substream) >= 0)
2448 			break;
2449 		/* Fall through */
2450 	case SNDRV_PCM_STATE_XRUN:
2451 		ret = -EPIPE;
2452 		goto __end;
2453 	case SNDRV_PCM_STATE_SUSPENDED:
2454 		ret = -ESTRPIPE;
2455 		goto __end;
2456 	default:
2457 		ret = -EBADFD;
2458 		goto __end;
2459 	}
2460 
2461 	hw_avail = snd_pcm_playback_hw_avail(runtime);
2462 	if (hw_avail <= 0) {
2463 		ret = 0;
2464 		goto __end;
2465 	}
2466 	if (frames > (snd_pcm_uframes_t)hw_avail)
2467 		frames = hw_avail;
2468 	appl_ptr = runtime->control->appl_ptr - frames;
2469 	if (appl_ptr < 0)
2470 		appl_ptr += runtime->boundary;
2471 	runtime->control->appl_ptr = appl_ptr;
2472 	ret = frames;
2473  __end:
2474 	snd_pcm_stream_unlock_irq(substream);
2475 	return ret;
2476 }
2477 
snd_pcm_capture_rewind(struct snd_pcm_substream * substream,snd_pcm_uframes_t frames)2478 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2479 						snd_pcm_uframes_t frames)
2480 {
2481 	struct snd_pcm_runtime *runtime = substream->runtime;
2482 	snd_pcm_sframes_t appl_ptr;
2483 	snd_pcm_sframes_t ret;
2484 	snd_pcm_sframes_t hw_avail;
2485 
2486 	if (frames == 0)
2487 		return 0;
2488 
2489 	snd_pcm_stream_lock_irq(substream);
2490 	switch (runtime->status->state) {
2491 	case SNDRV_PCM_STATE_PREPARED:
2492 	case SNDRV_PCM_STATE_DRAINING:
2493 		break;
2494 	case SNDRV_PCM_STATE_RUNNING:
2495 		if (snd_pcm_update_hw_ptr(substream) >= 0)
2496 			break;
2497 		/* Fall through */
2498 	case SNDRV_PCM_STATE_XRUN:
2499 		ret = -EPIPE;
2500 		goto __end;
2501 	case SNDRV_PCM_STATE_SUSPENDED:
2502 		ret = -ESTRPIPE;
2503 		goto __end;
2504 	default:
2505 		ret = -EBADFD;
2506 		goto __end;
2507 	}
2508 
2509 	hw_avail = snd_pcm_capture_hw_avail(runtime);
2510 	if (hw_avail <= 0) {
2511 		ret = 0;
2512 		goto __end;
2513 	}
2514 	if (frames > (snd_pcm_uframes_t)hw_avail)
2515 		frames = hw_avail;
2516 	appl_ptr = runtime->control->appl_ptr - frames;
2517 	if (appl_ptr < 0)
2518 		appl_ptr += runtime->boundary;
2519 	runtime->control->appl_ptr = appl_ptr;
2520 	ret = frames;
2521  __end:
2522 	snd_pcm_stream_unlock_irq(substream);
2523 	return ret;
2524 }
2525 
snd_pcm_playback_forward(struct snd_pcm_substream * substream,snd_pcm_uframes_t frames)2526 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2527 						  snd_pcm_uframes_t frames)
2528 {
2529 	struct snd_pcm_runtime *runtime = substream->runtime;
2530 	snd_pcm_sframes_t appl_ptr;
2531 	snd_pcm_sframes_t ret;
2532 	snd_pcm_sframes_t avail;
2533 
2534 	if (frames == 0)
2535 		return 0;
2536 
2537 	snd_pcm_stream_lock_irq(substream);
2538 	switch (runtime->status->state) {
2539 	case SNDRV_PCM_STATE_PREPARED:
2540 	case SNDRV_PCM_STATE_PAUSED:
2541 		break;
2542 	case SNDRV_PCM_STATE_DRAINING:
2543 	case SNDRV_PCM_STATE_RUNNING:
2544 		if (snd_pcm_update_hw_ptr(substream) >= 0)
2545 			break;
2546 		/* Fall through */
2547 	case SNDRV_PCM_STATE_XRUN:
2548 		ret = -EPIPE;
2549 		goto __end;
2550 	case SNDRV_PCM_STATE_SUSPENDED:
2551 		ret = -ESTRPIPE;
2552 		goto __end;
2553 	default:
2554 		ret = -EBADFD;
2555 		goto __end;
2556 	}
2557 
2558 	avail = snd_pcm_playback_avail(runtime);
2559 	if (avail <= 0) {
2560 		ret = 0;
2561 		goto __end;
2562 	}
2563 	if (frames > (snd_pcm_uframes_t)avail)
2564 		frames = avail;
2565 	appl_ptr = runtime->control->appl_ptr + frames;
2566 	if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2567 		appl_ptr -= runtime->boundary;
2568 	runtime->control->appl_ptr = appl_ptr;
2569 	ret = frames;
2570  __end:
2571 	snd_pcm_stream_unlock_irq(substream);
2572 	return ret;
2573 }
2574 
snd_pcm_capture_forward(struct snd_pcm_substream * substream,snd_pcm_uframes_t frames)2575 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2576 						 snd_pcm_uframes_t frames)
2577 {
2578 	struct snd_pcm_runtime *runtime = substream->runtime;
2579 	snd_pcm_sframes_t appl_ptr;
2580 	snd_pcm_sframes_t ret;
2581 	snd_pcm_sframes_t avail;
2582 
2583 	if (frames == 0)
2584 		return 0;
2585 
2586 	snd_pcm_stream_lock_irq(substream);
2587 	switch (runtime->status->state) {
2588 	case SNDRV_PCM_STATE_PREPARED:
2589 	case SNDRV_PCM_STATE_DRAINING:
2590 	case SNDRV_PCM_STATE_PAUSED:
2591 		break;
2592 	case SNDRV_PCM_STATE_RUNNING:
2593 		if (snd_pcm_update_hw_ptr(substream) >= 0)
2594 			break;
2595 		/* Fall through */
2596 	case SNDRV_PCM_STATE_XRUN:
2597 		ret = -EPIPE;
2598 		goto __end;
2599 	case SNDRV_PCM_STATE_SUSPENDED:
2600 		ret = -ESTRPIPE;
2601 		goto __end;
2602 	default:
2603 		ret = -EBADFD;
2604 		goto __end;
2605 	}
2606 
2607 	avail = snd_pcm_capture_avail(runtime);
2608 	if (avail <= 0) {
2609 		ret = 0;
2610 		goto __end;
2611 	}
2612 	if (frames > (snd_pcm_uframes_t)avail)
2613 		frames = avail;
2614 	appl_ptr = runtime->control->appl_ptr + frames;
2615 	if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2616 		appl_ptr -= runtime->boundary;
2617 	runtime->control->appl_ptr = appl_ptr;
2618 	ret = frames;
2619  __end:
2620 	snd_pcm_stream_unlock_irq(substream);
2621 	return ret;
2622 }
2623 
snd_pcm_hwsync(struct snd_pcm_substream * substream)2624 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2625 {
2626 	struct snd_pcm_runtime *runtime = substream->runtime;
2627 	int err;
2628 
2629 	snd_pcm_stream_lock_irq(substream);
2630 	switch (runtime->status->state) {
2631 	case SNDRV_PCM_STATE_DRAINING:
2632 		if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2633 			goto __badfd;
2634 		/* Fall through */
2635 	case SNDRV_PCM_STATE_RUNNING:
2636 		if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2637 			break;
2638 		/* Fall through */
2639 	case SNDRV_PCM_STATE_PREPARED:
2640 		err = 0;
2641 		break;
2642 	case SNDRV_PCM_STATE_SUSPENDED:
2643 		err = -ESTRPIPE;
2644 		break;
2645 	case SNDRV_PCM_STATE_XRUN:
2646 		err = -EPIPE;
2647 		break;
2648 	default:
2649 	      __badfd:
2650 		err = -EBADFD;
2651 		break;
2652 	}
2653 	snd_pcm_stream_unlock_irq(substream);
2654 	return err;
2655 }
2656 
snd_pcm_delay(struct snd_pcm_substream * substream,snd_pcm_sframes_t __user * res)2657 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2658 			 snd_pcm_sframes_t __user *res)
2659 {
2660 	struct snd_pcm_runtime *runtime = substream->runtime;
2661 	int err;
2662 	snd_pcm_sframes_t n = 0;
2663 
2664 	snd_pcm_stream_lock_irq(substream);
2665 	switch (runtime->status->state) {
2666 	case SNDRV_PCM_STATE_DRAINING:
2667 		if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2668 			goto __badfd;
2669 		/* Fall through */
2670 	case SNDRV_PCM_STATE_RUNNING:
2671 		if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2672 			break;
2673 		/* Fall through */
2674 	case SNDRV_PCM_STATE_PREPARED:
2675 	case SNDRV_PCM_STATE_SUSPENDED:
2676 		err = 0;
2677 		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2678 			n = snd_pcm_playback_hw_avail(runtime);
2679 		else
2680 			n = snd_pcm_capture_avail(runtime);
2681 		n += runtime->delay;
2682 		break;
2683 	case SNDRV_PCM_STATE_XRUN:
2684 		err = -EPIPE;
2685 		break;
2686 	default:
2687 	      __badfd:
2688 		err = -EBADFD;
2689 		break;
2690 	}
2691 	snd_pcm_stream_unlock_irq(substream);
2692 	if (!err)
2693 		if (put_user(n, res))
2694 			err = -EFAULT;
2695 	return err;
2696 }
2697 
snd_pcm_sync_ptr(struct snd_pcm_substream * substream,struct snd_pcm_sync_ptr __user * _sync_ptr)2698 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2699 			    struct snd_pcm_sync_ptr __user *_sync_ptr)
2700 {
2701 	struct snd_pcm_runtime *runtime = substream->runtime;
2702 	struct snd_pcm_sync_ptr sync_ptr;
2703 	volatile struct snd_pcm_mmap_status *status;
2704 	volatile struct snd_pcm_mmap_control *control;
2705 	int err;
2706 
2707 	memset(&sync_ptr, 0, sizeof(sync_ptr));
2708 	if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2709 		return -EFAULT;
2710 	if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2711 		return -EFAULT;
2712 	status = runtime->status;
2713 	control = runtime->control;
2714 	if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2715 		err = snd_pcm_hwsync(substream);
2716 		if (err < 0)
2717 			return err;
2718 	}
2719 	snd_pcm_stream_lock_irq(substream);
2720 	if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2721 		control->appl_ptr = sync_ptr.c.control.appl_ptr;
2722 	else
2723 		sync_ptr.c.control.appl_ptr = control->appl_ptr;
2724 	if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2725 		control->avail_min = sync_ptr.c.control.avail_min;
2726 	else
2727 		sync_ptr.c.control.avail_min = control->avail_min;
2728 	sync_ptr.s.status.state = status->state;
2729 	sync_ptr.s.status.hw_ptr = status->hw_ptr;
2730 	sync_ptr.s.status.tstamp = status->tstamp;
2731 	sync_ptr.s.status.suspended_state = status->suspended_state;
2732 	snd_pcm_stream_unlock_irq(substream);
2733 	if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2734 		return -EFAULT;
2735 	return 0;
2736 }
2737 
snd_pcm_tstamp(struct snd_pcm_substream * substream,int __user * _arg)2738 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2739 {
2740 	struct snd_pcm_runtime *runtime = substream->runtime;
2741 	int arg;
2742 
2743 	if (get_user(arg, _arg))
2744 		return -EFAULT;
2745 	if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2746 		return -EINVAL;
2747 	runtime->tstamp_type = arg;
2748 	return 0;
2749 }
2750 
snd_pcm_common_ioctl1(struct file * file,struct snd_pcm_substream * substream,unsigned int cmd,void __user * arg)2751 static int snd_pcm_common_ioctl1(struct file *file,
2752 				 struct snd_pcm_substream *substream,
2753 				 unsigned int cmd, void __user *arg)
2754 {
2755 	switch (cmd) {
2756 	case SNDRV_PCM_IOCTL_PVERSION:
2757 		return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2758 	case SNDRV_PCM_IOCTL_INFO:
2759 		return snd_pcm_info_user(substream, arg);
2760 	case SNDRV_PCM_IOCTL_TSTAMP:	/* just for compatibility */
2761 		return 0;
2762 	case SNDRV_PCM_IOCTL_TTSTAMP:
2763 		return snd_pcm_tstamp(substream, arg);
2764 	case SNDRV_PCM_IOCTL_HW_REFINE:
2765 		return snd_pcm_hw_refine_user(substream, arg);
2766 	case SNDRV_PCM_IOCTL_HW_PARAMS:
2767 		return snd_pcm_hw_params_user(substream, arg);
2768 	case SNDRV_PCM_IOCTL_HW_FREE:
2769 		return snd_pcm_hw_free(substream);
2770 	case SNDRV_PCM_IOCTL_SW_PARAMS:
2771 		return snd_pcm_sw_params_user(substream, arg);
2772 	case SNDRV_PCM_IOCTL_STATUS:
2773 		return snd_pcm_status_user(substream, arg, false);
2774 	case SNDRV_PCM_IOCTL_STATUS_EXT:
2775 		return snd_pcm_status_user(substream, arg, true);
2776 	case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2777 		return snd_pcm_channel_info_user(substream, arg);
2778 	case SNDRV_PCM_IOCTL_PREPARE:
2779 		return snd_pcm_prepare(substream, file);
2780 	case SNDRV_PCM_IOCTL_RESET:
2781 		return snd_pcm_reset(substream);
2782 	case SNDRV_PCM_IOCTL_START:
2783 		return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2784 	case SNDRV_PCM_IOCTL_LINK:
2785 		return snd_pcm_link(substream, (int)(unsigned long) arg);
2786 	case SNDRV_PCM_IOCTL_UNLINK:
2787 		return snd_pcm_unlink(substream);
2788 	case SNDRV_PCM_IOCTL_RESUME:
2789 		return snd_pcm_resume(substream);
2790 	case SNDRV_PCM_IOCTL_XRUN:
2791 		return snd_pcm_xrun(substream);
2792 	case SNDRV_PCM_IOCTL_HWSYNC:
2793 		return snd_pcm_hwsync(substream);
2794 	case SNDRV_PCM_IOCTL_DELAY:
2795 		return snd_pcm_delay(substream, arg);
2796 	case SNDRV_PCM_IOCTL_SYNC_PTR:
2797 		return snd_pcm_sync_ptr(substream, arg);
2798 #ifdef CONFIG_SND_SUPPORT_OLD_API
2799 	case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2800 		return snd_pcm_hw_refine_old_user(substream, arg);
2801 	case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2802 		return snd_pcm_hw_params_old_user(substream, arg);
2803 #endif
2804 	case SNDRV_PCM_IOCTL_DRAIN:
2805 		return snd_pcm_drain(substream, file);
2806 	case SNDRV_PCM_IOCTL_DROP:
2807 		return snd_pcm_drop(substream);
2808 	case SNDRV_PCM_IOCTL_PAUSE:
2809 	{
2810 		int res;
2811 		snd_pcm_stream_lock_irq(substream);
2812 		res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2813 		snd_pcm_stream_unlock_irq(substream);
2814 		return res;
2815 	}
2816 	}
2817 	pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
2818 	return -ENOTTY;
2819 }
2820 
snd_pcm_playback_ioctl1(struct file * file,struct snd_pcm_substream * substream,unsigned int cmd,void __user * arg)2821 static int snd_pcm_playback_ioctl1(struct file *file,
2822 				   struct snd_pcm_substream *substream,
2823 				   unsigned int cmd, void __user *arg)
2824 {
2825 	if (snd_BUG_ON(!substream))
2826 		return -ENXIO;
2827 	if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2828 		return -EINVAL;
2829 	switch (cmd) {
2830 	case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2831 	{
2832 		struct snd_xferi xferi;
2833 		struct snd_xferi __user *_xferi = arg;
2834 		struct snd_pcm_runtime *runtime = substream->runtime;
2835 		snd_pcm_sframes_t result;
2836 		if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2837 			return -EBADFD;
2838 		if (put_user(0, &_xferi->result))
2839 			return -EFAULT;
2840 		if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2841 			return -EFAULT;
2842 		result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2843 		__put_user(result, &_xferi->result);
2844 		return result < 0 ? result : 0;
2845 	}
2846 	case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2847 	{
2848 		struct snd_xfern xfern;
2849 		struct snd_xfern __user *_xfern = arg;
2850 		struct snd_pcm_runtime *runtime = substream->runtime;
2851 		void __user **bufs;
2852 		snd_pcm_sframes_t result;
2853 		if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2854 			return -EBADFD;
2855 		if (runtime->channels > 128)
2856 			return -EINVAL;
2857 		if (put_user(0, &_xfern->result))
2858 			return -EFAULT;
2859 		if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2860 			return -EFAULT;
2861 
2862 		bufs = memdup_user(xfern.bufs,
2863 				   sizeof(void *) * runtime->channels);
2864 		if (IS_ERR(bufs))
2865 			return PTR_ERR(bufs);
2866 		result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2867 		kfree(bufs);
2868 		__put_user(result, &_xfern->result);
2869 		return result < 0 ? result : 0;
2870 	}
2871 	case SNDRV_PCM_IOCTL_REWIND:
2872 	{
2873 		snd_pcm_uframes_t frames;
2874 		snd_pcm_uframes_t __user *_frames = arg;
2875 		snd_pcm_sframes_t result;
2876 		if (get_user(frames, _frames))
2877 			return -EFAULT;
2878 		if (put_user(0, _frames))
2879 			return -EFAULT;
2880 		result = snd_pcm_playback_rewind(substream, frames);
2881 		__put_user(result, _frames);
2882 		return result < 0 ? result : 0;
2883 	}
2884 	case SNDRV_PCM_IOCTL_FORWARD:
2885 	{
2886 		snd_pcm_uframes_t frames;
2887 		snd_pcm_uframes_t __user *_frames = arg;
2888 		snd_pcm_sframes_t result;
2889 		if (get_user(frames, _frames))
2890 			return -EFAULT;
2891 		if (put_user(0, _frames))
2892 			return -EFAULT;
2893 		result = snd_pcm_playback_forward(substream, frames);
2894 		__put_user(result, _frames);
2895 		return result < 0 ? result : 0;
2896 	}
2897 	}
2898 	return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2899 }
2900 
snd_pcm_capture_ioctl1(struct file * file,struct snd_pcm_substream * substream,unsigned int cmd,void __user * arg)2901 static int snd_pcm_capture_ioctl1(struct file *file,
2902 				  struct snd_pcm_substream *substream,
2903 				  unsigned int cmd, void __user *arg)
2904 {
2905 	if (snd_BUG_ON(!substream))
2906 		return -ENXIO;
2907 	if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2908 		return -EINVAL;
2909 	switch (cmd) {
2910 	case SNDRV_PCM_IOCTL_READI_FRAMES:
2911 	{
2912 		struct snd_xferi xferi;
2913 		struct snd_xferi __user *_xferi = arg;
2914 		struct snd_pcm_runtime *runtime = substream->runtime;
2915 		snd_pcm_sframes_t result;
2916 		if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2917 			return -EBADFD;
2918 		if (put_user(0, &_xferi->result))
2919 			return -EFAULT;
2920 		if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2921 			return -EFAULT;
2922 		result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2923 		__put_user(result, &_xferi->result);
2924 		return result < 0 ? result : 0;
2925 	}
2926 	case SNDRV_PCM_IOCTL_READN_FRAMES:
2927 	{
2928 		struct snd_xfern xfern;
2929 		struct snd_xfern __user *_xfern = arg;
2930 		struct snd_pcm_runtime *runtime = substream->runtime;
2931 		void *bufs;
2932 		snd_pcm_sframes_t result;
2933 		if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2934 			return -EBADFD;
2935 		if (runtime->channels > 128)
2936 			return -EINVAL;
2937 		if (put_user(0, &_xfern->result))
2938 			return -EFAULT;
2939 		if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2940 			return -EFAULT;
2941 
2942 		bufs = memdup_user(xfern.bufs,
2943 				   sizeof(void *) * runtime->channels);
2944 		if (IS_ERR(bufs))
2945 			return PTR_ERR(bufs);
2946 		result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2947 		kfree(bufs);
2948 		__put_user(result, &_xfern->result);
2949 		return result < 0 ? result : 0;
2950 	}
2951 	case SNDRV_PCM_IOCTL_REWIND:
2952 	{
2953 		snd_pcm_uframes_t frames;
2954 		snd_pcm_uframes_t __user *_frames = arg;
2955 		snd_pcm_sframes_t result;
2956 		if (get_user(frames, _frames))
2957 			return -EFAULT;
2958 		if (put_user(0, _frames))
2959 			return -EFAULT;
2960 		result = snd_pcm_capture_rewind(substream, frames);
2961 		__put_user(result, _frames);
2962 		return result < 0 ? result : 0;
2963 	}
2964 	case SNDRV_PCM_IOCTL_FORWARD:
2965 	{
2966 		snd_pcm_uframes_t frames;
2967 		snd_pcm_uframes_t __user *_frames = arg;
2968 		snd_pcm_sframes_t result;
2969 		if (get_user(frames, _frames))
2970 			return -EFAULT;
2971 		if (put_user(0, _frames))
2972 			return -EFAULT;
2973 		result = snd_pcm_capture_forward(substream, frames);
2974 		__put_user(result, _frames);
2975 		return result < 0 ? result : 0;
2976 	}
2977 	}
2978 	return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2979 }
2980 
snd_pcm_playback_ioctl(struct file * file,unsigned int cmd,unsigned long arg)2981 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2982 				   unsigned long arg)
2983 {
2984 	struct snd_pcm_file *pcm_file;
2985 
2986 	pcm_file = file->private_data;
2987 
2988 	if (((cmd >> 8) & 0xff) != 'A')
2989 		return -ENOTTY;
2990 
2991 	return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2992 				       (void __user *)arg);
2993 }
2994 
snd_pcm_capture_ioctl(struct file * file,unsigned int cmd,unsigned long arg)2995 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2996 				  unsigned long arg)
2997 {
2998 	struct snd_pcm_file *pcm_file;
2999 
3000 	pcm_file = file->private_data;
3001 
3002 	if (((cmd >> 8) & 0xff) != 'A')
3003 		return -ENOTTY;
3004 
3005 	return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
3006 				      (void __user *)arg);
3007 }
3008 
snd_pcm_kernel_ioctl(struct snd_pcm_substream * substream,unsigned int cmd,void * arg)3009 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
3010 			 unsigned int cmd, void *arg)
3011 {
3012 	mm_segment_t fs;
3013 	int result;
3014 
3015 	fs = snd_enter_user();
3016 	switch (substream->stream) {
3017 	case SNDRV_PCM_STREAM_PLAYBACK:
3018 		result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
3019 						 (void __user *)arg);
3020 		break;
3021 	case SNDRV_PCM_STREAM_CAPTURE:
3022 		result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
3023 						(void __user *)arg);
3024 		break;
3025 	default:
3026 		result = -EINVAL;
3027 		break;
3028 	}
3029 	snd_leave_user(fs);
3030 	return result;
3031 }
3032 
3033 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
3034 
snd_pcm_read(struct file * file,char __user * buf,size_t count,loff_t * offset)3035 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
3036 			    loff_t * offset)
3037 {
3038 	struct snd_pcm_file *pcm_file;
3039 	struct snd_pcm_substream *substream;
3040 	struct snd_pcm_runtime *runtime;
3041 	snd_pcm_sframes_t result;
3042 
3043 	pcm_file = file->private_data;
3044 	substream = pcm_file->substream;
3045 	if (PCM_RUNTIME_CHECK(substream))
3046 		return -ENXIO;
3047 	runtime = substream->runtime;
3048 	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3049 		return -EBADFD;
3050 	if (!frame_aligned(runtime, count))
3051 		return -EINVAL;
3052 	count = bytes_to_frames(runtime, count);
3053 	result = snd_pcm_lib_read(substream, buf, count);
3054 	if (result > 0)
3055 		result = frames_to_bytes(runtime, result);
3056 	return result;
3057 }
3058 
snd_pcm_write(struct file * file,const char __user * buf,size_t count,loff_t * offset)3059 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
3060 			     size_t count, loff_t * offset)
3061 {
3062 	struct snd_pcm_file *pcm_file;
3063 	struct snd_pcm_substream *substream;
3064 	struct snd_pcm_runtime *runtime;
3065 	snd_pcm_sframes_t result;
3066 
3067 	pcm_file = file->private_data;
3068 	substream = pcm_file->substream;
3069 	if (PCM_RUNTIME_CHECK(substream))
3070 		return -ENXIO;
3071 	runtime = substream->runtime;
3072 	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3073 		return -EBADFD;
3074 	if (!frame_aligned(runtime, count))
3075 		return -EINVAL;
3076 	count = bytes_to_frames(runtime, count);
3077 	result = snd_pcm_lib_write(substream, buf, count);
3078 	if (result > 0)
3079 		result = frames_to_bytes(runtime, result);
3080 	return result;
3081 }
3082 
snd_pcm_readv(struct kiocb * iocb,struct iov_iter * to)3083 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to)
3084 {
3085 	struct snd_pcm_file *pcm_file;
3086 	struct snd_pcm_substream *substream;
3087 	struct snd_pcm_runtime *runtime;
3088 	snd_pcm_sframes_t result;
3089 	unsigned long i;
3090 	void __user **bufs;
3091 	snd_pcm_uframes_t frames;
3092 
3093 	pcm_file = iocb->ki_filp->private_data;
3094 	substream = pcm_file->substream;
3095 	if (PCM_RUNTIME_CHECK(substream))
3096 		return -ENXIO;
3097 	runtime = substream->runtime;
3098 	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3099 		return -EBADFD;
3100 	if (!iter_is_iovec(to))
3101 		return -EINVAL;
3102 	if (to->nr_segs > 1024 || to->nr_segs != runtime->channels)
3103 		return -EINVAL;
3104 	if (!frame_aligned(runtime, to->iov->iov_len))
3105 		return -EINVAL;
3106 	frames = bytes_to_samples(runtime, to->iov->iov_len);
3107 	bufs = kmalloc(sizeof(void *) * to->nr_segs, GFP_KERNEL);
3108 	if (bufs == NULL)
3109 		return -ENOMEM;
3110 	for (i = 0; i < to->nr_segs; ++i)
3111 		bufs[i] = to->iov[i].iov_base;
3112 	result = snd_pcm_lib_readv(substream, bufs, frames);
3113 	if (result > 0)
3114 		result = frames_to_bytes(runtime, result);
3115 	kfree(bufs);
3116 	return result;
3117 }
3118 
snd_pcm_writev(struct kiocb * iocb,struct iov_iter * from)3119 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from)
3120 {
3121 	struct snd_pcm_file *pcm_file;
3122 	struct snd_pcm_substream *substream;
3123 	struct snd_pcm_runtime *runtime;
3124 	snd_pcm_sframes_t result;
3125 	unsigned long i;
3126 	void __user **bufs;
3127 	snd_pcm_uframes_t frames;
3128 
3129 	pcm_file = iocb->ki_filp->private_data;
3130 	substream = pcm_file->substream;
3131 	if (PCM_RUNTIME_CHECK(substream))
3132 		return -ENXIO;
3133 	runtime = substream->runtime;
3134 	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3135 		return -EBADFD;
3136 	if (!iter_is_iovec(from))
3137 		return -EINVAL;
3138 	if (from->nr_segs > 128 || from->nr_segs != runtime->channels ||
3139 	    !frame_aligned(runtime, from->iov->iov_len))
3140 		return -EINVAL;
3141 	frames = bytes_to_samples(runtime, from->iov->iov_len);
3142 	bufs = kmalloc(sizeof(void *) * from->nr_segs, GFP_KERNEL);
3143 	if (bufs == NULL)
3144 		return -ENOMEM;
3145 	for (i = 0; i < from->nr_segs; ++i)
3146 		bufs[i] = from->iov[i].iov_base;
3147 	result = snd_pcm_lib_writev(substream, bufs, frames);
3148 	if (result > 0)
3149 		result = frames_to_bytes(runtime, result);
3150 	kfree(bufs);
3151 	return result;
3152 }
3153 
snd_pcm_playback_poll(struct file * file,poll_table * wait)3154 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
3155 {
3156 	struct snd_pcm_file *pcm_file;
3157 	struct snd_pcm_substream *substream;
3158 	struct snd_pcm_runtime *runtime;
3159         unsigned int mask;
3160 	snd_pcm_uframes_t avail;
3161 
3162 	pcm_file = file->private_data;
3163 
3164 	substream = pcm_file->substream;
3165 	if (PCM_RUNTIME_CHECK(substream))
3166 		return POLLOUT | POLLWRNORM | POLLERR;
3167 	runtime = substream->runtime;
3168 
3169 	poll_wait(file, &runtime->sleep, wait);
3170 
3171 	snd_pcm_stream_lock_irq(substream);
3172 	avail = snd_pcm_playback_avail(runtime);
3173 	switch (runtime->status->state) {
3174 	case SNDRV_PCM_STATE_RUNNING:
3175 	case SNDRV_PCM_STATE_PREPARED:
3176 	case SNDRV_PCM_STATE_PAUSED:
3177 		if (avail >= runtime->control->avail_min) {
3178 			mask = POLLOUT | POLLWRNORM;
3179 			break;
3180 		}
3181 		/* Fall through */
3182 	case SNDRV_PCM_STATE_DRAINING:
3183 		mask = 0;
3184 		break;
3185 	default:
3186 		mask = POLLOUT | POLLWRNORM | POLLERR;
3187 		break;
3188 	}
3189 	snd_pcm_stream_unlock_irq(substream);
3190 	return mask;
3191 }
3192 
snd_pcm_capture_poll(struct file * file,poll_table * wait)3193 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
3194 {
3195 	struct snd_pcm_file *pcm_file;
3196 	struct snd_pcm_substream *substream;
3197 	struct snd_pcm_runtime *runtime;
3198         unsigned int mask;
3199 	snd_pcm_uframes_t avail;
3200 
3201 	pcm_file = file->private_data;
3202 
3203 	substream = pcm_file->substream;
3204 	if (PCM_RUNTIME_CHECK(substream))
3205 		return POLLIN | POLLRDNORM | POLLERR;
3206 	runtime = substream->runtime;
3207 
3208 	poll_wait(file, &runtime->sleep, wait);
3209 
3210 	snd_pcm_stream_lock_irq(substream);
3211 	avail = snd_pcm_capture_avail(runtime);
3212 	switch (runtime->status->state) {
3213 	case SNDRV_PCM_STATE_RUNNING:
3214 	case SNDRV_PCM_STATE_PREPARED:
3215 	case SNDRV_PCM_STATE_PAUSED:
3216 		if (avail >= runtime->control->avail_min) {
3217 			mask = POLLIN | POLLRDNORM;
3218 			break;
3219 		}
3220 		mask = 0;
3221 		break;
3222 	case SNDRV_PCM_STATE_DRAINING:
3223 		if (avail > 0) {
3224 			mask = POLLIN | POLLRDNORM;
3225 			break;
3226 		}
3227 		/* Fall through */
3228 	default:
3229 		mask = POLLIN | POLLRDNORM | POLLERR;
3230 		break;
3231 	}
3232 	snd_pcm_stream_unlock_irq(substream);
3233 	return mask;
3234 }
3235 
3236 /*
3237  * mmap support
3238  */
3239 
3240 /*
3241  * Only on coherent architectures, we can mmap the status and the control records
3242  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
3243  */
3244 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3245 /*
3246  * mmap status record
3247  */
snd_pcm_mmap_status_fault(struct vm_area_struct * area,struct vm_fault * vmf)3248 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
3249 						struct vm_fault *vmf)
3250 {
3251 	struct snd_pcm_substream *substream = area->vm_private_data;
3252 	struct snd_pcm_runtime *runtime;
3253 
3254 	if (substream == NULL)
3255 		return VM_FAULT_SIGBUS;
3256 	runtime = substream->runtime;
3257 	vmf->page = virt_to_page(runtime->status);
3258 	get_page(vmf->page);
3259 	return 0;
3260 }
3261 
3262 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3263 {
3264 	.fault =	snd_pcm_mmap_status_fault,
3265 };
3266 
snd_pcm_mmap_status(struct snd_pcm_substream * substream,struct file * file,struct vm_area_struct * area)3267 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3268 			       struct vm_area_struct *area)
3269 {
3270 	long size;
3271 	if (!(area->vm_flags & VM_READ))
3272 		return -EINVAL;
3273 	size = area->vm_end - area->vm_start;
3274 	if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3275 		return -EINVAL;
3276 	area->vm_ops = &snd_pcm_vm_ops_status;
3277 	area->vm_private_data = substream;
3278 	area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3279 	return 0;
3280 }
3281 
3282 /*
3283  * mmap control record
3284  */
snd_pcm_mmap_control_fault(struct vm_area_struct * area,struct vm_fault * vmf)3285 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3286 						struct vm_fault *vmf)
3287 {
3288 	struct snd_pcm_substream *substream = area->vm_private_data;
3289 	struct snd_pcm_runtime *runtime;
3290 
3291 	if (substream == NULL)
3292 		return VM_FAULT_SIGBUS;
3293 	runtime = substream->runtime;
3294 	vmf->page = virt_to_page(runtime->control);
3295 	get_page(vmf->page);
3296 	return 0;
3297 }
3298 
3299 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3300 {
3301 	.fault =	snd_pcm_mmap_control_fault,
3302 };
3303 
snd_pcm_mmap_control(struct snd_pcm_substream * substream,struct file * file,struct vm_area_struct * area)3304 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3305 				struct vm_area_struct *area)
3306 {
3307 	long size;
3308 	if (!(area->vm_flags & VM_READ))
3309 		return -EINVAL;
3310 	size = area->vm_end - area->vm_start;
3311 	if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3312 		return -EINVAL;
3313 	area->vm_ops = &snd_pcm_vm_ops_control;
3314 	area->vm_private_data = substream;
3315 	area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3316 	return 0;
3317 }
3318 #else /* ! coherent mmap */
3319 /*
3320  * don't support mmap for status and control records.
3321  */
snd_pcm_mmap_status(struct snd_pcm_substream * substream,struct file * file,struct vm_area_struct * area)3322 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3323 			       struct vm_area_struct *area)
3324 {
3325 	return -ENXIO;
3326 }
snd_pcm_mmap_control(struct snd_pcm_substream * substream,struct file * file,struct vm_area_struct * area)3327 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3328 				struct vm_area_struct *area)
3329 {
3330 	return -ENXIO;
3331 }
3332 #endif /* coherent mmap */
3333 
3334 static inline struct page *
snd_pcm_default_page_ops(struct snd_pcm_substream * substream,unsigned long ofs)3335 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3336 {
3337 	void *vaddr = substream->runtime->dma_area + ofs;
3338 	return virt_to_page(vaddr);
3339 }
3340 
3341 /*
3342  * fault callback for mmapping a RAM page
3343  */
snd_pcm_mmap_data_fault(struct vm_area_struct * area,struct vm_fault * vmf)3344 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3345 						struct vm_fault *vmf)
3346 {
3347 	struct snd_pcm_substream *substream = area->vm_private_data;
3348 	struct snd_pcm_runtime *runtime;
3349 	unsigned long offset;
3350 	struct page * page;
3351 	size_t dma_bytes;
3352 
3353 	if (substream == NULL)
3354 		return VM_FAULT_SIGBUS;
3355 	runtime = substream->runtime;
3356 	offset = vmf->pgoff << PAGE_SHIFT;
3357 	dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3358 	if (offset > dma_bytes - PAGE_SIZE)
3359 		return VM_FAULT_SIGBUS;
3360 	if (substream->ops->page)
3361 		page = substream->ops->page(substream, offset);
3362 	else
3363 		page = snd_pcm_default_page_ops(substream, offset);
3364 	if (!page)
3365 		return VM_FAULT_SIGBUS;
3366 	get_page(page);
3367 	vmf->page = page;
3368 	return 0;
3369 }
3370 
3371 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3372 	.open =		snd_pcm_mmap_data_open,
3373 	.close =	snd_pcm_mmap_data_close,
3374 };
3375 
3376 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3377 	.open =		snd_pcm_mmap_data_open,
3378 	.close =	snd_pcm_mmap_data_close,
3379 	.fault =	snd_pcm_mmap_data_fault,
3380 };
3381 
3382 /*
3383  * mmap the DMA buffer on RAM
3384  */
3385 
3386 /**
3387  * snd_pcm_lib_default_mmap - Default PCM data mmap function
3388  * @substream: PCM substream
3389  * @area: VMA
3390  *
3391  * This is the default mmap handler for PCM data.  When mmap pcm_ops is NULL,
3392  * this function is invoked implicitly.
3393  */
snd_pcm_lib_default_mmap(struct snd_pcm_substream * substream,struct vm_area_struct * area)3394 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3395 			     struct vm_area_struct *area)
3396 {
3397 	area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3398 #ifdef CONFIG_GENERIC_ALLOCATOR
3399 	if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) {
3400 		area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
3401 		return remap_pfn_range(area, area->vm_start,
3402 				substream->dma_buffer.addr >> PAGE_SHIFT,
3403 				area->vm_end - area->vm_start, area->vm_page_prot);
3404 	}
3405 #endif /* CONFIG_GENERIC_ALLOCATOR */
3406 #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */
3407 	if (!substream->ops->page &&
3408 	    substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3409 		return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3410 					 area,
3411 					 substream->runtime->dma_area,
3412 					 substream->runtime->dma_addr,
3413 					 substream->runtime->dma_bytes);
3414 #endif /* CONFIG_X86 */
3415 	/* mmap with fault handler */
3416 	area->vm_ops = &snd_pcm_vm_ops_data_fault;
3417 	return 0;
3418 }
3419 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3420 
3421 /*
3422  * mmap the DMA buffer on I/O memory area
3423  */
3424 #if SNDRV_PCM_INFO_MMAP_IOMEM
3425 /**
3426  * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem
3427  * @substream: PCM substream
3428  * @area: VMA
3429  *
3430  * When your hardware uses the iomapped pages as the hardware buffer and
3431  * wants to mmap it, pass this function as mmap pcm_ops.  Note that this
3432  * is supposed to work only on limited architectures.
3433  */
snd_pcm_lib_mmap_iomem(struct snd_pcm_substream * substream,struct vm_area_struct * area)3434 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3435 			   struct vm_area_struct *area)
3436 {
3437 	struct snd_pcm_runtime *runtime = substream->runtime;;
3438 
3439 	area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3440 	return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3441 }
3442 
3443 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3444 #endif /* SNDRV_PCM_INFO_MMAP */
3445 
3446 /*
3447  * mmap DMA buffer
3448  */
snd_pcm_mmap_data(struct snd_pcm_substream * substream,struct file * file,struct vm_area_struct * area)3449 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3450 		      struct vm_area_struct *area)
3451 {
3452 	struct snd_pcm_runtime *runtime;
3453 	long size;
3454 	unsigned long offset;
3455 	size_t dma_bytes;
3456 	int err;
3457 
3458 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3459 		if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3460 			return -EINVAL;
3461 	} else {
3462 		if (!(area->vm_flags & VM_READ))
3463 			return -EINVAL;
3464 	}
3465 	runtime = substream->runtime;
3466 	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3467 		return -EBADFD;
3468 	if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3469 		return -ENXIO;
3470 	if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3471 	    runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3472 		return -EINVAL;
3473 	size = area->vm_end - area->vm_start;
3474 	offset = area->vm_pgoff << PAGE_SHIFT;
3475 	dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3476 	if ((size_t)size > dma_bytes)
3477 		return -EINVAL;
3478 	if (offset > dma_bytes - size)
3479 		return -EINVAL;
3480 
3481 	area->vm_ops = &snd_pcm_vm_ops_data;
3482 	area->vm_private_data = substream;
3483 	if (substream->ops->mmap)
3484 		err = substream->ops->mmap(substream, area);
3485 	else
3486 		err = snd_pcm_lib_default_mmap(substream, area);
3487 	if (!err)
3488 		atomic_inc(&substream->mmap_count);
3489 	return err;
3490 }
3491 
3492 EXPORT_SYMBOL(snd_pcm_mmap_data);
3493 
snd_pcm_mmap(struct file * file,struct vm_area_struct * area)3494 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3495 {
3496 	struct snd_pcm_file * pcm_file;
3497 	struct snd_pcm_substream *substream;
3498 	unsigned long offset;
3499 
3500 	pcm_file = file->private_data;
3501 	substream = pcm_file->substream;
3502 	if (PCM_RUNTIME_CHECK(substream))
3503 		return -ENXIO;
3504 
3505 	offset = area->vm_pgoff << PAGE_SHIFT;
3506 	switch (offset) {
3507 	case SNDRV_PCM_MMAP_OFFSET_STATUS:
3508 		if (pcm_file->no_compat_mmap)
3509 			return -ENXIO;
3510 		return snd_pcm_mmap_status(substream, file, area);
3511 	case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3512 		if (pcm_file->no_compat_mmap)
3513 			return -ENXIO;
3514 		return snd_pcm_mmap_control(substream, file, area);
3515 	default:
3516 		return snd_pcm_mmap_data(substream, file, area);
3517 	}
3518 	return 0;
3519 }
3520 
snd_pcm_fasync(int fd,struct file * file,int on)3521 static int snd_pcm_fasync(int fd, struct file * file, int on)
3522 {
3523 	struct snd_pcm_file * pcm_file;
3524 	struct snd_pcm_substream *substream;
3525 	struct snd_pcm_runtime *runtime;
3526 
3527 	pcm_file = file->private_data;
3528 	substream = pcm_file->substream;
3529 	if (PCM_RUNTIME_CHECK(substream))
3530 		return -ENXIO;
3531 	runtime = substream->runtime;
3532 	return fasync_helper(fd, file, on, &runtime->fasync);
3533 }
3534 
3535 /*
3536  * ioctl32 compat
3537  */
3538 #ifdef CONFIG_COMPAT
3539 #include "pcm_compat.c"
3540 #else
3541 #define snd_pcm_ioctl_compat	NULL
3542 #endif
3543 
3544 /*
3545  *  To be removed helpers to keep binary compatibility
3546  */
3547 
3548 #ifdef CONFIG_SND_SUPPORT_OLD_API
3549 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3550 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3551 
snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params * params,struct snd_pcm_hw_params_old * oparams)3552 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3553 					       struct snd_pcm_hw_params_old *oparams)
3554 {
3555 	unsigned int i;
3556 
3557 	memset(params, 0, sizeof(*params));
3558 	params->flags = oparams->flags;
3559 	for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3560 		params->masks[i].bits[0] = oparams->masks[i];
3561 	memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3562 	params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3563 	params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3564 	params->info = oparams->info;
3565 	params->msbits = oparams->msbits;
3566 	params->rate_num = oparams->rate_num;
3567 	params->rate_den = oparams->rate_den;
3568 	params->fifo_size = oparams->fifo_size;
3569 }
3570 
snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old * oparams,struct snd_pcm_hw_params * params)3571 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3572 					     struct snd_pcm_hw_params *params)
3573 {
3574 	unsigned int i;
3575 
3576 	memset(oparams, 0, sizeof(*oparams));
3577 	oparams->flags = params->flags;
3578 	for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3579 		oparams->masks[i] = params->masks[i].bits[0];
3580 	memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3581 	oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3582 	oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3583 	oparams->info = params->info;
3584 	oparams->msbits = params->msbits;
3585 	oparams->rate_num = params->rate_num;
3586 	oparams->rate_den = params->rate_den;
3587 	oparams->fifo_size = params->fifo_size;
3588 }
3589 
snd_pcm_hw_refine_old_user(struct snd_pcm_substream * substream,struct snd_pcm_hw_params_old __user * _oparams)3590 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3591 				      struct snd_pcm_hw_params_old __user * _oparams)
3592 {
3593 	struct snd_pcm_hw_params *params;
3594 	struct snd_pcm_hw_params_old *oparams = NULL;
3595 	int err;
3596 
3597 	params = kmalloc(sizeof(*params), GFP_KERNEL);
3598 	if (!params)
3599 		return -ENOMEM;
3600 
3601 	oparams = memdup_user(_oparams, sizeof(*oparams));
3602 	if (IS_ERR(oparams)) {
3603 		err = PTR_ERR(oparams);
3604 		goto out;
3605 	}
3606 	snd_pcm_hw_convert_from_old_params(params, oparams);
3607 	err = snd_pcm_hw_refine(substream, params);
3608 	snd_pcm_hw_convert_to_old_params(oparams, params);
3609 	if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3610 		if (!err)
3611 			err = -EFAULT;
3612 	}
3613 
3614 	kfree(oparams);
3615 out:
3616 	kfree(params);
3617 	return err;
3618 }
3619 
snd_pcm_hw_params_old_user(struct snd_pcm_substream * substream,struct snd_pcm_hw_params_old __user * _oparams)3620 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3621 				      struct snd_pcm_hw_params_old __user * _oparams)
3622 {
3623 	struct snd_pcm_hw_params *params;
3624 	struct snd_pcm_hw_params_old *oparams = NULL;
3625 	int err;
3626 
3627 	params = kmalloc(sizeof(*params), GFP_KERNEL);
3628 	if (!params)
3629 		return -ENOMEM;
3630 
3631 	oparams = memdup_user(_oparams, sizeof(*oparams));
3632 	if (IS_ERR(oparams)) {
3633 		err = PTR_ERR(oparams);
3634 		goto out;
3635 	}
3636 	snd_pcm_hw_convert_from_old_params(params, oparams);
3637 	err = snd_pcm_hw_params(substream, params);
3638 	snd_pcm_hw_convert_to_old_params(oparams, params);
3639 	if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3640 		if (!err)
3641 			err = -EFAULT;
3642 	}
3643 
3644 	kfree(oparams);
3645 out:
3646 	kfree(params);
3647 	return err;
3648 }
3649 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3650 
3651 #ifndef CONFIG_MMU
snd_pcm_get_unmapped_area(struct file * file,unsigned long addr,unsigned long len,unsigned long pgoff,unsigned long flags)3652 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3653 					       unsigned long addr,
3654 					       unsigned long len,
3655 					       unsigned long pgoff,
3656 					       unsigned long flags)
3657 {
3658 	struct snd_pcm_file *pcm_file = file->private_data;
3659 	struct snd_pcm_substream *substream = pcm_file->substream;
3660 	struct snd_pcm_runtime *runtime = substream->runtime;
3661 	unsigned long offset = pgoff << PAGE_SHIFT;
3662 
3663 	switch (offset) {
3664 	case SNDRV_PCM_MMAP_OFFSET_STATUS:
3665 		return (unsigned long)runtime->status;
3666 	case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3667 		return (unsigned long)runtime->control;
3668 	default:
3669 		return (unsigned long)runtime->dma_area + offset;
3670 	}
3671 }
3672 #else
3673 # define snd_pcm_get_unmapped_area NULL
3674 #endif
3675 
3676 /*
3677  *  Register section
3678  */
3679 
3680 const struct file_operations snd_pcm_f_ops[2] = {
3681 	{
3682 		.owner =		THIS_MODULE,
3683 		.write =		snd_pcm_write,
3684 		.write_iter =		snd_pcm_writev,
3685 		.open =			snd_pcm_playback_open,
3686 		.release =		snd_pcm_release,
3687 		.llseek =		no_llseek,
3688 		.poll =			snd_pcm_playback_poll,
3689 		.unlocked_ioctl =	snd_pcm_playback_ioctl,
3690 		.compat_ioctl = 	snd_pcm_ioctl_compat,
3691 		.mmap =			snd_pcm_mmap,
3692 		.fasync =		snd_pcm_fasync,
3693 		.get_unmapped_area =	snd_pcm_get_unmapped_area,
3694 	},
3695 	{
3696 		.owner =		THIS_MODULE,
3697 		.read =			snd_pcm_read,
3698 		.read_iter =		snd_pcm_readv,
3699 		.open =			snd_pcm_capture_open,
3700 		.release =		snd_pcm_release,
3701 		.llseek =		no_llseek,
3702 		.poll =			snd_pcm_capture_poll,
3703 		.unlocked_ioctl =	snd_pcm_capture_ioctl,
3704 		.compat_ioctl = 	snd_pcm_ioctl_compat,
3705 		.mmap =			snd_pcm_mmap,
3706 		.fasync =		snd_pcm_fasync,
3707 		.get_unmapped_area =	snd_pcm_get_unmapped_area,
3708 	}
3709 };
3710