xref: /openbmc/linux/sound/core/pcm_native.c (revision 4800cd83)
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/file.h>
24 #include <linux/slab.h>
25 #include <linux/time.h>
26 #include <linux/pm_qos_params.h>
27 #include <linux/uio.h>
28 #include <linux/dma-mapping.h>
29 #include <sound/core.h>
30 #include <sound/control.h>
31 #include <sound/info.h>
32 #include <sound/pcm.h>
33 #include <sound/pcm_params.h>
34 #include <sound/timer.h>
35 #include <sound/minors.h>
36 #include <asm/io.h>
37 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
38 #include <dma-coherence.h>
39 #endif
40 
41 /*
42  *  Compatibility
43  */
44 
45 struct snd_pcm_hw_params_old {
46 	unsigned int flags;
47 	unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
48 			   SNDRV_PCM_HW_PARAM_ACCESS + 1];
49 	struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
50 					SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
51 	unsigned int rmask;
52 	unsigned int cmask;
53 	unsigned int info;
54 	unsigned int msbits;
55 	unsigned int rate_num;
56 	unsigned int rate_den;
57 	snd_pcm_uframes_t fifo_size;
58 	unsigned char reserved[64];
59 };
60 
61 #ifdef CONFIG_SND_SUPPORT_OLD_API
62 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
63 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
64 
65 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
66 				      struct snd_pcm_hw_params_old __user * _oparams);
67 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
68 				      struct snd_pcm_hw_params_old __user * _oparams);
69 #endif
70 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
71 
72 /*
73  *
74  */
75 
76 DEFINE_RWLOCK(snd_pcm_link_rwlock);
77 EXPORT_SYMBOL(snd_pcm_link_rwlock);
78 
79 static DECLARE_RWSEM(snd_pcm_link_rwsem);
80 
81 static inline mm_segment_t snd_enter_user(void)
82 {
83 	mm_segment_t fs = get_fs();
84 	set_fs(get_ds());
85 	return fs;
86 }
87 
88 static inline void snd_leave_user(mm_segment_t fs)
89 {
90 	set_fs(fs);
91 }
92 
93 
94 
95 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
96 {
97 	struct snd_pcm_runtime *runtime;
98 	struct snd_pcm *pcm = substream->pcm;
99 	struct snd_pcm_str *pstr = substream->pstr;
100 
101 	memset(info, 0, sizeof(*info));
102 	info->card = pcm->card->number;
103 	info->device = pcm->device;
104 	info->stream = substream->stream;
105 	info->subdevice = substream->number;
106 	strlcpy(info->id, pcm->id, sizeof(info->id));
107 	strlcpy(info->name, pcm->name, sizeof(info->name));
108 	info->dev_class = pcm->dev_class;
109 	info->dev_subclass = pcm->dev_subclass;
110 	info->subdevices_count = pstr->substream_count;
111 	info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
112 	strlcpy(info->subname, substream->name, sizeof(info->subname));
113 	runtime = substream->runtime;
114 	/* AB: FIXME!!! This is definitely nonsense */
115 	if (runtime) {
116 		info->sync = runtime->sync;
117 		substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
118 	}
119 	return 0;
120 }
121 
122 int snd_pcm_info_user(struct snd_pcm_substream *substream,
123 		      struct snd_pcm_info __user * _info)
124 {
125 	struct snd_pcm_info *info;
126 	int err;
127 
128 	info = kmalloc(sizeof(*info), GFP_KERNEL);
129 	if (! info)
130 		return -ENOMEM;
131 	err = snd_pcm_info(substream, info);
132 	if (err >= 0) {
133 		if (copy_to_user(_info, info, sizeof(*info)))
134 			err = -EFAULT;
135 	}
136 	kfree(info);
137 	return err;
138 }
139 
140 #undef RULES_DEBUG
141 
142 #ifdef RULES_DEBUG
143 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
144 static const char * const snd_pcm_hw_param_names[] = {
145 	HW_PARAM(ACCESS),
146 	HW_PARAM(FORMAT),
147 	HW_PARAM(SUBFORMAT),
148 	HW_PARAM(SAMPLE_BITS),
149 	HW_PARAM(FRAME_BITS),
150 	HW_PARAM(CHANNELS),
151 	HW_PARAM(RATE),
152 	HW_PARAM(PERIOD_TIME),
153 	HW_PARAM(PERIOD_SIZE),
154 	HW_PARAM(PERIOD_BYTES),
155 	HW_PARAM(PERIODS),
156 	HW_PARAM(BUFFER_TIME),
157 	HW_PARAM(BUFFER_SIZE),
158 	HW_PARAM(BUFFER_BYTES),
159 	HW_PARAM(TICK_TIME),
160 };
161 #endif
162 
163 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
164 		      struct snd_pcm_hw_params *params)
165 {
166 	unsigned int k;
167 	struct snd_pcm_hardware *hw;
168 	struct snd_interval *i = NULL;
169 	struct snd_mask *m = NULL;
170 	struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
171 	unsigned int rstamps[constrs->rules_num];
172 	unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
173 	unsigned int stamp = 2;
174 	int changed, again;
175 
176 	params->info = 0;
177 	params->fifo_size = 0;
178 	if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
179 		params->msbits = 0;
180 	if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
181 		params->rate_num = 0;
182 		params->rate_den = 0;
183 	}
184 
185 	for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
186 		m = hw_param_mask(params, k);
187 		if (snd_mask_empty(m))
188 			return -EINVAL;
189 		if (!(params->rmask & (1 << k)))
190 			continue;
191 #ifdef RULES_DEBUG
192 		printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
193 		printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
194 #endif
195 		changed = snd_mask_refine(m, constrs_mask(constrs, k));
196 #ifdef RULES_DEBUG
197 		printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
198 #endif
199 		if (changed)
200 			params->cmask |= 1 << k;
201 		if (changed < 0)
202 			return changed;
203 	}
204 
205 	for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
206 		i = hw_param_interval(params, k);
207 		if (snd_interval_empty(i))
208 			return -EINVAL;
209 		if (!(params->rmask & (1 << k)))
210 			continue;
211 #ifdef RULES_DEBUG
212 		printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
213 		if (i->empty)
214 			printk("empty");
215 		else
216 			printk("%c%u %u%c",
217 			       i->openmin ? '(' : '[', i->min,
218 			       i->max, i->openmax ? ')' : ']');
219 		printk(" -> ");
220 #endif
221 		changed = snd_interval_refine(i, constrs_interval(constrs, k));
222 #ifdef RULES_DEBUG
223 		if (i->empty)
224 			printk("empty\n");
225 		else
226 			printk("%c%u %u%c\n",
227 			       i->openmin ? '(' : '[', i->min,
228 			       i->max, i->openmax ? ')' : ']');
229 #endif
230 		if (changed)
231 			params->cmask |= 1 << k;
232 		if (changed < 0)
233 			return changed;
234 	}
235 
236 	for (k = 0; k < constrs->rules_num; k++)
237 		rstamps[k] = 0;
238 	for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
239 		vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
240 	do {
241 		again = 0;
242 		for (k = 0; k < constrs->rules_num; k++) {
243 			struct snd_pcm_hw_rule *r = &constrs->rules[k];
244 			unsigned int d;
245 			int doit = 0;
246 			if (r->cond && !(r->cond & params->flags))
247 				continue;
248 			for (d = 0; r->deps[d] >= 0; d++) {
249 				if (vstamps[r->deps[d]] > rstamps[k]) {
250 					doit = 1;
251 					break;
252 				}
253 			}
254 			if (!doit)
255 				continue;
256 #ifdef RULES_DEBUG
257 			printk(KERN_DEBUG "Rule %d [%p]: ", k, r->func);
258 			if (r->var >= 0) {
259 				printk("%s = ", snd_pcm_hw_param_names[r->var]);
260 				if (hw_is_mask(r->var)) {
261 					m = hw_param_mask(params, r->var);
262 					printk("%x", *m->bits);
263 				} else {
264 					i = hw_param_interval(params, r->var);
265 					if (i->empty)
266 						printk("empty");
267 					else
268 						printk("%c%u %u%c",
269 						       i->openmin ? '(' : '[', i->min,
270 						       i->max, i->openmax ? ')' : ']');
271 				}
272 			}
273 #endif
274 			changed = r->func(params, r);
275 #ifdef RULES_DEBUG
276 			if (r->var >= 0) {
277 				printk(" -> ");
278 				if (hw_is_mask(r->var))
279 					printk("%x", *m->bits);
280 				else {
281 					if (i->empty)
282 						printk("empty");
283 					else
284 						printk("%c%u %u%c",
285 						       i->openmin ? '(' : '[', i->min,
286 						       i->max, i->openmax ? ')' : ']');
287 				}
288 			}
289 			printk("\n");
290 #endif
291 			rstamps[k] = stamp;
292 			if (changed && r->var >= 0) {
293 				params->cmask |= (1 << r->var);
294 				vstamps[r->var] = stamp;
295 				again = 1;
296 			}
297 			if (changed < 0)
298 				return changed;
299 			stamp++;
300 		}
301 	} while (again);
302 	if (!params->msbits) {
303 		i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
304 		if (snd_interval_single(i))
305 			params->msbits = snd_interval_value(i);
306 	}
307 
308 	if (!params->rate_den) {
309 		i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
310 		if (snd_interval_single(i)) {
311 			params->rate_num = snd_interval_value(i);
312 			params->rate_den = 1;
313 		}
314 	}
315 
316 	hw = &substream->runtime->hw;
317 	if (!params->info)
318 		params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
319 	if (!params->fifo_size) {
320 		m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
321 		i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
322 		if (snd_mask_min(m) == snd_mask_max(m) &&
323                     snd_interval_min(i) == snd_interval_max(i)) {
324 			changed = substream->ops->ioctl(substream,
325 					SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
326 			if (changed < 0)
327 				return changed;
328 		}
329 	}
330 	params->rmask = 0;
331 	return 0;
332 }
333 
334 EXPORT_SYMBOL(snd_pcm_hw_refine);
335 
336 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
337 				  struct snd_pcm_hw_params __user * _params)
338 {
339 	struct snd_pcm_hw_params *params;
340 	int err;
341 
342 	params = memdup_user(_params, sizeof(*params));
343 	if (IS_ERR(params))
344 		return PTR_ERR(params);
345 
346 	err = snd_pcm_hw_refine(substream, params);
347 	if (copy_to_user(_params, params, sizeof(*params))) {
348 		if (!err)
349 			err = -EFAULT;
350 	}
351 
352 	kfree(params);
353 	return err;
354 }
355 
356 static int period_to_usecs(struct snd_pcm_runtime *runtime)
357 {
358 	int usecs;
359 
360 	if (! runtime->rate)
361 		return -1; /* invalid */
362 
363 	/* take 75% of period time as the deadline */
364 	usecs = (750000 / runtime->rate) * runtime->period_size;
365 	usecs += ((750000 % runtime->rate) * runtime->period_size) /
366 		runtime->rate;
367 
368 	return usecs;
369 }
370 
371 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
372 			     struct snd_pcm_hw_params *params)
373 {
374 	struct snd_pcm_runtime *runtime;
375 	int err, usecs;
376 	unsigned int bits;
377 	snd_pcm_uframes_t frames;
378 
379 	if (PCM_RUNTIME_CHECK(substream))
380 		return -ENXIO;
381 	runtime = substream->runtime;
382 	snd_pcm_stream_lock_irq(substream);
383 	switch (runtime->status->state) {
384 	case SNDRV_PCM_STATE_OPEN:
385 	case SNDRV_PCM_STATE_SETUP:
386 	case SNDRV_PCM_STATE_PREPARED:
387 		break;
388 	default:
389 		snd_pcm_stream_unlock_irq(substream);
390 		return -EBADFD;
391 	}
392 	snd_pcm_stream_unlock_irq(substream);
393 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
394 	if (!substream->oss.oss)
395 #endif
396 		if (atomic_read(&substream->mmap_count))
397 			return -EBADFD;
398 
399 	params->rmask = ~0U;
400 	err = snd_pcm_hw_refine(substream, params);
401 	if (err < 0)
402 		goto _error;
403 
404 	err = snd_pcm_hw_params_choose(substream, params);
405 	if (err < 0)
406 		goto _error;
407 
408 	if (substream->ops->hw_params != NULL) {
409 		err = substream->ops->hw_params(substream, params);
410 		if (err < 0)
411 			goto _error;
412 	}
413 
414 	runtime->access = params_access(params);
415 	runtime->format = params_format(params);
416 	runtime->subformat = params_subformat(params);
417 	runtime->channels = params_channels(params);
418 	runtime->rate = params_rate(params);
419 	runtime->period_size = params_period_size(params);
420 	runtime->periods = params_periods(params);
421 	runtime->buffer_size = params_buffer_size(params);
422 	runtime->info = params->info;
423 	runtime->rate_num = params->rate_num;
424 	runtime->rate_den = params->rate_den;
425 	runtime->no_period_wakeup =
426 			(params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
427 			(params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
428 
429 	bits = snd_pcm_format_physical_width(runtime->format);
430 	runtime->sample_bits = bits;
431 	bits *= runtime->channels;
432 	runtime->frame_bits = bits;
433 	frames = 1;
434 	while (bits % 8 != 0) {
435 		bits *= 2;
436 		frames *= 2;
437 	}
438 	runtime->byte_align = bits / 8;
439 	runtime->min_align = frames;
440 
441 	/* Default sw params */
442 	runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
443 	runtime->period_step = 1;
444 	runtime->control->avail_min = runtime->period_size;
445 	runtime->start_threshold = 1;
446 	runtime->stop_threshold = runtime->buffer_size;
447 	runtime->silence_threshold = 0;
448 	runtime->silence_size = 0;
449 	runtime->boundary = runtime->buffer_size;
450 	while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
451 		runtime->boundary *= 2;
452 
453 	snd_pcm_timer_resolution_change(substream);
454 	runtime->status->state = SNDRV_PCM_STATE_SETUP;
455 
456 	if (pm_qos_request_active(&substream->latency_pm_qos_req))
457 		pm_qos_remove_request(&substream->latency_pm_qos_req);
458 	if ((usecs = period_to_usecs(runtime)) >= 0)
459 		pm_qos_add_request(&substream->latency_pm_qos_req,
460 				   PM_QOS_CPU_DMA_LATENCY, usecs);
461 	return 0;
462  _error:
463 	/* hardware might be unuseable from this time,
464 	   so we force application to retry to set
465 	   the correct hardware parameter settings */
466 	runtime->status->state = SNDRV_PCM_STATE_OPEN;
467 	if (substream->ops->hw_free != NULL)
468 		substream->ops->hw_free(substream);
469 	return err;
470 }
471 
472 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
473 				  struct snd_pcm_hw_params __user * _params)
474 {
475 	struct snd_pcm_hw_params *params;
476 	int err;
477 
478 	params = memdup_user(_params, sizeof(*params));
479 	if (IS_ERR(params))
480 		return PTR_ERR(params);
481 
482 	err = snd_pcm_hw_params(substream, params);
483 	if (copy_to_user(_params, params, sizeof(*params))) {
484 		if (!err)
485 			err = -EFAULT;
486 	}
487 
488 	kfree(params);
489 	return err;
490 }
491 
492 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
493 {
494 	struct snd_pcm_runtime *runtime;
495 	int result = 0;
496 
497 	if (PCM_RUNTIME_CHECK(substream))
498 		return -ENXIO;
499 	runtime = substream->runtime;
500 	snd_pcm_stream_lock_irq(substream);
501 	switch (runtime->status->state) {
502 	case SNDRV_PCM_STATE_SETUP:
503 	case SNDRV_PCM_STATE_PREPARED:
504 		break;
505 	default:
506 		snd_pcm_stream_unlock_irq(substream);
507 		return -EBADFD;
508 	}
509 	snd_pcm_stream_unlock_irq(substream);
510 	if (atomic_read(&substream->mmap_count))
511 		return -EBADFD;
512 	if (substream->ops->hw_free)
513 		result = substream->ops->hw_free(substream);
514 	runtime->status->state = SNDRV_PCM_STATE_OPEN;
515 	pm_qos_remove_request(&substream->latency_pm_qos_req);
516 	return result;
517 }
518 
519 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
520 			     struct snd_pcm_sw_params *params)
521 {
522 	struct snd_pcm_runtime *runtime;
523 	int err;
524 
525 	if (PCM_RUNTIME_CHECK(substream))
526 		return -ENXIO;
527 	runtime = substream->runtime;
528 	snd_pcm_stream_lock_irq(substream);
529 	if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
530 		snd_pcm_stream_unlock_irq(substream);
531 		return -EBADFD;
532 	}
533 	snd_pcm_stream_unlock_irq(substream);
534 
535 	if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
536 		return -EINVAL;
537 	if (params->avail_min == 0)
538 		return -EINVAL;
539 	if (params->silence_size >= runtime->boundary) {
540 		if (params->silence_threshold != 0)
541 			return -EINVAL;
542 	} else {
543 		if (params->silence_size > params->silence_threshold)
544 			return -EINVAL;
545 		if (params->silence_threshold > runtime->buffer_size)
546 			return -EINVAL;
547 	}
548 	err = 0;
549 	snd_pcm_stream_lock_irq(substream);
550 	runtime->tstamp_mode = params->tstamp_mode;
551 	runtime->period_step = params->period_step;
552 	runtime->control->avail_min = params->avail_min;
553 	runtime->start_threshold = params->start_threshold;
554 	runtime->stop_threshold = params->stop_threshold;
555 	runtime->silence_threshold = params->silence_threshold;
556 	runtime->silence_size = params->silence_size;
557         params->boundary = runtime->boundary;
558 	if (snd_pcm_running(substream)) {
559 		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
560 		    runtime->silence_size > 0)
561 			snd_pcm_playback_silence(substream, ULONG_MAX);
562 		err = snd_pcm_update_state(substream, runtime);
563 	}
564 	snd_pcm_stream_unlock_irq(substream);
565 	return err;
566 }
567 
568 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
569 				  struct snd_pcm_sw_params __user * _params)
570 {
571 	struct snd_pcm_sw_params params;
572 	int err;
573 	if (copy_from_user(&params, _params, sizeof(params)))
574 		return -EFAULT;
575 	err = snd_pcm_sw_params(substream, &params);
576 	if (copy_to_user(_params, &params, sizeof(params)))
577 		return -EFAULT;
578 	return err;
579 }
580 
581 int snd_pcm_status(struct snd_pcm_substream *substream,
582 		   struct snd_pcm_status *status)
583 {
584 	struct snd_pcm_runtime *runtime = substream->runtime;
585 
586 	snd_pcm_stream_lock_irq(substream);
587 	status->state = runtime->status->state;
588 	status->suspended_state = runtime->status->suspended_state;
589 	if (status->state == SNDRV_PCM_STATE_OPEN)
590 		goto _end;
591 	status->trigger_tstamp = runtime->trigger_tstamp;
592 	if (snd_pcm_running(substream)) {
593 		snd_pcm_update_hw_ptr(substream);
594 		if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
595 			status->tstamp = runtime->status->tstamp;
596 			goto _tstamp_end;
597 		}
598 	}
599 	snd_pcm_gettime(runtime, &status->tstamp);
600  _tstamp_end:
601 	status->appl_ptr = runtime->control->appl_ptr;
602 	status->hw_ptr = runtime->status->hw_ptr;
603 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
604 		status->avail = snd_pcm_playback_avail(runtime);
605 		if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
606 		    runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
607 			status->delay = runtime->buffer_size - status->avail;
608 			status->delay += runtime->delay;
609 		} else
610 			status->delay = 0;
611 	} else {
612 		status->avail = snd_pcm_capture_avail(runtime);
613 		if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
614 			status->delay = status->avail + runtime->delay;
615 		else
616 			status->delay = 0;
617 	}
618 	status->avail_max = runtime->avail_max;
619 	status->overrange = runtime->overrange;
620 	runtime->avail_max = 0;
621 	runtime->overrange = 0;
622  _end:
623  	snd_pcm_stream_unlock_irq(substream);
624 	return 0;
625 }
626 
627 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
628 			       struct snd_pcm_status __user * _status)
629 {
630 	struct snd_pcm_status status;
631 	int res;
632 
633 	memset(&status, 0, sizeof(status));
634 	res = snd_pcm_status(substream, &status);
635 	if (res < 0)
636 		return res;
637 	if (copy_to_user(_status, &status, sizeof(status)))
638 		return -EFAULT;
639 	return 0;
640 }
641 
642 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
643 				struct snd_pcm_channel_info * info)
644 {
645 	struct snd_pcm_runtime *runtime;
646 	unsigned int channel;
647 
648 	channel = info->channel;
649 	runtime = substream->runtime;
650 	snd_pcm_stream_lock_irq(substream);
651 	if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
652 		snd_pcm_stream_unlock_irq(substream);
653 		return -EBADFD;
654 	}
655 	snd_pcm_stream_unlock_irq(substream);
656 	if (channel >= runtime->channels)
657 		return -EINVAL;
658 	memset(info, 0, sizeof(*info));
659 	info->channel = channel;
660 	return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
661 }
662 
663 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
664 				     struct snd_pcm_channel_info __user * _info)
665 {
666 	struct snd_pcm_channel_info info;
667 	int res;
668 
669 	if (copy_from_user(&info, _info, sizeof(info)))
670 		return -EFAULT;
671 	res = snd_pcm_channel_info(substream, &info);
672 	if (res < 0)
673 		return res;
674 	if (copy_to_user(_info, &info, sizeof(info)))
675 		return -EFAULT;
676 	return 0;
677 }
678 
679 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
680 {
681 	struct snd_pcm_runtime *runtime = substream->runtime;
682 	if (runtime->trigger_master == NULL)
683 		return;
684 	if (runtime->trigger_master == substream) {
685 		snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
686 	} else {
687 		snd_pcm_trigger_tstamp(runtime->trigger_master);
688 		runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
689 	}
690 	runtime->trigger_master = NULL;
691 }
692 
693 struct action_ops {
694 	int (*pre_action)(struct snd_pcm_substream *substream, int state);
695 	int (*do_action)(struct snd_pcm_substream *substream, int state);
696 	void (*undo_action)(struct snd_pcm_substream *substream, int state);
697 	void (*post_action)(struct snd_pcm_substream *substream, int state);
698 };
699 
700 /*
701  *  this functions is core for handling of linked stream
702  *  Note: the stream state might be changed also on failure
703  *  Note2: call with calling stream lock + link lock
704  */
705 static int snd_pcm_action_group(struct action_ops *ops,
706 				struct snd_pcm_substream *substream,
707 				int state, int do_lock)
708 {
709 	struct snd_pcm_substream *s = NULL;
710 	struct snd_pcm_substream *s1;
711 	int res = 0;
712 
713 	snd_pcm_group_for_each_entry(s, substream) {
714 		if (do_lock && s != substream)
715 			spin_lock_nested(&s->self_group.lock,
716 					 SINGLE_DEPTH_NESTING);
717 		res = ops->pre_action(s, state);
718 		if (res < 0)
719 			goto _unlock;
720 	}
721 	snd_pcm_group_for_each_entry(s, substream) {
722 		res = ops->do_action(s, state);
723 		if (res < 0) {
724 			if (ops->undo_action) {
725 				snd_pcm_group_for_each_entry(s1, substream) {
726 					if (s1 == s) /* failed stream */
727 						break;
728 					ops->undo_action(s1, state);
729 				}
730 			}
731 			s = NULL; /* unlock all */
732 			goto _unlock;
733 		}
734 	}
735 	snd_pcm_group_for_each_entry(s, substream) {
736 		ops->post_action(s, state);
737 	}
738  _unlock:
739 	if (do_lock) {
740 		/* unlock streams */
741 		snd_pcm_group_for_each_entry(s1, substream) {
742 			if (s1 != substream)
743 				spin_unlock(&s1->self_group.lock);
744 			if (s1 == s)	/* end */
745 				break;
746 		}
747 	}
748 	return res;
749 }
750 
751 /*
752  *  Note: call with stream lock
753  */
754 static int snd_pcm_action_single(struct action_ops *ops,
755 				 struct snd_pcm_substream *substream,
756 				 int state)
757 {
758 	int res;
759 
760 	res = ops->pre_action(substream, state);
761 	if (res < 0)
762 		return res;
763 	res = ops->do_action(substream, state);
764 	if (res == 0)
765 		ops->post_action(substream, state);
766 	else if (ops->undo_action)
767 		ops->undo_action(substream, state);
768 	return res;
769 }
770 
771 /*
772  *  Note: call with stream lock
773  */
774 static int snd_pcm_action(struct action_ops *ops,
775 			  struct snd_pcm_substream *substream,
776 			  int state)
777 {
778 	int res;
779 
780 	if (snd_pcm_stream_linked(substream)) {
781 		if (!spin_trylock(&substream->group->lock)) {
782 			spin_unlock(&substream->self_group.lock);
783 			spin_lock(&substream->group->lock);
784 			spin_lock(&substream->self_group.lock);
785 		}
786 		res = snd_pcm_action_group(ops, substream, state, 1);
787 		spin_unlock(&substream->group->lock);
788 	} else {
789 		res = snd_pcm_action_single(ops, substream, state);
790 	}
791 	return res;
792 }
793 
794 /*
795  *  Note: don't use any locks before
796  */
797 static int snd_pcm_action_lock_irq(struct action_ops *ops,
798 				   struct snd_pcm_substream *substream,
799 				   int state)
800 {
801 	int res;
802 
803 	read_lock_irq(&snd_pcm_link_rwlock);
804 	if (snd_pcm_stream_linked(substream)) {
805 		spin_lock(&substream->group->lock);
806 		spin_lock(&substream->self_group.lock);
807 		res = snd_pcm_action_group(ops, substream, state, 1);
808 		spin_unlock(&substream->self_group.lock);
809 		spin_unlock(&substream->group->lock);
810 	} else {
811 		spin_lock(&substream->self_group.lock);
812 		res = snd_pcm_action_single(ops, substream, state);
813 		spin_unlock(&substream->self_group.lock);
814 	}
815 	read_unlock_irq(&snd_pcm_link_rwlock);
816 	return res;
817 }
818 
819 /*
820  */
821 static int snd_pcm_action_nonatomic(struct action_ops *ops,
822 				    struct snd_pcm_substream *substream,
823 				    int state)
824 {
825 	int res;
826 
827 	down_read(&snd_pcm_link_rwsem);
828 	if (snd_pcm_stream_linked(substream))
829 		res = snd_pcm_action_group(ops, substream, state, 0);
830 	else
831 		res = snd_pcm_action_single(ops, substream, state);
832 	up_read(&snd_pcm_link_rwsem);
833 	return res;
834 }
835 
836 /*
837  * start callbacks
838  */
839 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
840 {
841 	struct snd_pcm_runtime *runtime = substream->runtime;
842 	if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
843 		return -EBADFD;
844 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
845 	    !snd_pcm_playback_data(substream))
846 		return -EPIPE;
847 	runtime->trigger_master = substream;
848 	return 0;
849 }
850 
851 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
852 {
853 	if (substream->runtime->trigger_master != substream)
854 		return 0;
855 	return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
856 }
857 
858 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
859 {
860 	if (substream->runtime->trigger_master == substream)
861 		substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
862 }
863 
864 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
865 {
866 	struct snd_pcm_runtime *runtime = substream->runtime;
867 	snd_pcm_trigger_tstamp(substream);
868 	runtime->hw_ptr_jiffies = jiffies;
869 	runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
870 							    runtime->rate;
871 	runtime->status->state = state;
872 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
873 	    runtime->silence_size > 0)
874 		snd_pcm_playback_silence(substream, ULONG_MAX);
875 	if (substream->timer)
876 		snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
877 				 &runtime->trigger_tstamp);
878 }
879 
880 static struct action_ops snd_pcm_action_start = {
881 	.pre_action = snd_pcm_pre_start,
882 	.do_action = snd_pcm_do_start,
883 	.undo_action = snd_pcm_undo_start,
884 	.post_action = snd_pcm_post_start
885 };
886 
887 /**
888  * snd_pcm_start - start all linked streams
889  * @substream: the PCM substream instance
890  */
891 int snd_pcm_start(struct snd_pcm_substream *substream)
892 {
893 	return snd_pcm_action(&snd_pcm_action_start, substream,
894 			      SNDRV_PCM_STATE_RUNNING);
895 }
896 
897 /*
898  * stop callbacks
899  */
900 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
901 {
902 	struct snd_pcm_runtime *runtime = substream->runtime;
903 	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
904 		return -EBADFD;
905 	runtime->trigger_master = substream;
906 	return 0;
907 }
908 
909 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
910 {
911 	if (substream->runtime->trigger_master == substream &&
912 	    snd_pcm_running(substream))
913 		substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
914 	return 0; /* unconditonally stop all substreams */
915 }
916 
917 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
918 {
919 	struct snd_pcm_runtime *runtime = substream->runtime;
920 	if (runtime->status->state != state) {
921 		snd_pcm_trigger_tstamp(substream);
922 		if (substream->timer)
923 			snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
924 					 &runtime->trigger_tstamp);
925 		runtime->status->state = state;
926 	}
927 	wake_up(&runtime->sleep);
928 	wake_up(&runtime->tsleep);
929 }
930 
931 static struct action_ops snd_pcm_action_stop = {
932 	.pre_action = snd_pcm_pre_stop,
933 	.do_action = snd_pcm_do_stop,
934 	.post_action = snd_pcm_post_stop
935 };
936 
937 /**
938  * snd_pcm_stop - try to stop all running streams in the substream group
939  * @substream: the PCM substream instance
940  * @state: PCM state after stopping the stream
941  *
942  * The state of each stream is then changed to the given state unconditionally.
943  */
944 int snd_pcm_stop(struct snd_pcm_substream *substream, int state)
945 {
946 	return snd_pcm_action(&snd_pcm_action_stop, substream, state);
947 }
948 
949 EXPORT_SYMBOL(snd_pcm_stop);
950 
951 /**
952  * snd_pcm_drain_done - stop the DMA only when the given stream is playback
953  * @substream: the PCM substream
954  *
955  * After stopping, the state is changed to SETUP.
956  * Unlike snd_pcm_stop(), this affects only the given stream.
957  */
958 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
959 {
960 	return snd_pcm_action_single(&snd_pcm_action_stop, substream,
961 				     SNDRV_PCM_STATE_SETUP);
962 }
963 
964 /*
965  * pause callbacks
966  */
967 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
968 {
969 	struct snd_pcm_runtime *runtime = substream->runtime;
970 	if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
971 		return -ENOSYS;
972 	if (push) {
973 		if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
974 			return -EBADFD;
975 	} else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
976 		return -EBADFD;
977 	runtime->trigger_master = substream;
978 	return 0;
979 }
980 
981 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
982 {
983 	if (substream->runtime->trigger_master != substream)
984 		return 0;
985 	/* some drivers might use hw_ptr to recover from the pause -
986 	   update the hw_ptr now */
987 	if (push)
988 		snd_pcm_update_hw_ptr(substream);
989 	/* The jiffies check in snd_pcm_update_hw_ptr*() is done by
990 	 * a delta between the current jiffies, this gives a large enough
991 	 * delta, effectively to skip the check once.
992 	 */
993 	substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
994 	return substream->ops->trigger(substream,
995 				       push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
996 					      SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
997 }
998 
999 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1000 {
1001 	if (substream->runtime->trigger_master == substream)
1002 		substream->ops->trigger(substream,
1003 					push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1004 					SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1005 }
1006 
1007 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1008 {
1009 	struct snd_pcm_runtime *runtime = substream->runtime;
1010 	snd_pcm_trigger_tstamp(substream);
1011 	if (push) {
1012 		runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1013 		if (substream->timer)
1014 			snd_timer_notify(substream->timer,
1015 					 SNDRV_TIMER_EVENT_MPAUSE,
1016 					 &runtime->trigger_tstamp);
1017 		wake_up(&runtime->sleep);
1018 		wake_up(&runtime->tsleep);
1019 	} else {
1020 		runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1021 		if (substream->timer)
1022 			snd_timer_notify(substream->timer,
1023 					 SNDRV_TIMER_EVENT_MCONTINUE,
1024 					 &runtime->trigger_tstamp);
1025 	}
1026 }
1027 
1028 static struct action_ops snd_pcm_action_pause = {
1029 	.pre_action = snd_pcm_pre_pause,
1030 	.do_action = snd_pcm_do_pause,
1031 	.undo_action = snd_pcm_undo_pause,
1032 	.post_action = snd_pcm_post_pause
1033 };
1034 
1035 /*
1036  * Push/release the pause for all linked streams.
1037  */
1038 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1039 {
1040 	return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1041 }
1042 
1043 #ifdef CONFIG_PM
1044 /* suspend */
1045 
1046 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1047 {
1048 	struct snd_pcm_runtime *runtime = substream->runtime;
1049 	if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1050 		return -EBUSY;
1051 	runtime->trigger_master = substream;
1052 	return 0;
1053 }
1054 
1055 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1056 {
1057 	struct snd_pcm_runtime *runtime = substream->runtime;
1058 	if (runtime->trigger_master != substream)
1059 		return 0;
1060 	if (! snd_pcm_running(substream))
1061 		return 0;
1062 	substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1063 	return 0; /* suspend unconditionally */
1064 }
1065 
1066 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1067 {
1068 	struct snd_pcm_runtime *runtime = substream->runtime;
1069 	snd_pcm_trigger_tstamp(substream);
1070 	if (substream->timer)
1071 		snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1072 				 &runtime->trigger_tstamp);
1073 	runtime->status->suspended_state = runtime->status->state;
1074 	runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1075 	wake_up(&runtime->sleep);
1076 	wake_up(&runtime->tsleep);
1077 }
1078 
1079 static struct action_ops snd_pcm_action_suspend = {
1080 	.pre_action = snd_pcm_pre_suspend,
1081 	.do_action = snd_pcm_do_suspend,
1082 	.post_action = snd_pcm_post_suspend
1083 };
1084 
1085 /**
1086  * snd_pcm_suspend - trigger SUSPEND to all linked streams
1087  * @substream: the PCM substream
1088  *
1089  * After this call, all streams are changed to SUSPENDED state.
1090  */
1091 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1092 {
1093 	int err;
1094 	unsigned long flags;
1095 
1096 	if (! substream)
1097 		return 0;
1098 
1099 	snd_pcm_stream_lock_irqsave(substream, flags);
1100 	err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1101 	snd_pcm_stream_unlock_irqrestore(substream, flags);
1102 	return err;
1103 }
1104 
1105 EXPORT_SYMBOL(snd_pcm_suspend);
1106 
1107 /**
1108  * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1109  * @pcm: the PCM instance
1110  *
1111  * After this call, all streams are changed to SUSPENDED state.
1112  */
1113 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1114 {
1115 	struct snd_pcm_substream *substream;
1116 	int stream, err = 0;
1117 
1118 	if (! pcm)
1119 		return 0;
1120 
1121 	for (stream = 0; stream < 2; stream++) {
1122 		for (substream = pcm->streams[stream].substream;
1123 		     substream; substream = substream->next) {
1124 			/* FIXME: the open/close code should lock this as well */
1125 			if (substream->runtime == NULL)
1126 				continue;
1127 			err = snd_pcm_suspend(substream);
1128 			if (err < 0 && err != -EBUSY)
1129 				return err;
1130 		}
1131 	}
1132 	return 0;
1133 }
1134 
1135 EXPORT_SYMBOL(snd_pcm_suspend_all);
1136 
1137 /* resume */
1138 
1139 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1140 {
1141 	struct snd_pcm_runtime *runtime = substream->runtime;
1142 	if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1143 		return -ENOSYS;
1144 	runtime->trigger_master = substream;
1145 	return 0;
1146 }
1147 
1148 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1149 {
1150 	struct snd_pcm_runtime *runtime = substream->runtime;
1151 	if (runtime->trigger_master != substream)
1152 		return 0;
1153 	/* DMA not running previously? */
1154 	if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1155 	    (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1156 	     substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1157 		return 0;
1158 	return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1159 }
1160 
1161 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1162 {
1163 	if (substream->runtime->trigger_master == substream &&
1164 	    snd_pcm_running(substream))
1165 		substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1166 }
1167 
1168 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1169 {
1170 	struct snd_pcm_runtime *runtime = substream->runtime;
1171 	snd_pcm_trigger_tstamp(substream);
1172 	if (substream->timer)
1173 		snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1174 				 &runtime->trigger_tstamp);
1175 	runtime->status->state = runtime->status->suspended_state;
1176 }
1177 
1178 static struct action_ops snd_pcm_action_resume = {
1179 	.pre_action = snd_pcm_pre_resume,
1180 	.do_action = snd_pcm_do_resume,
1181 	.undo_action = snd_pcm_undo_resume,
1182 	.post_action = snd_pcm_post_resume
1183 };
1184 
1185 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1186 {
1187 	struct snd_card *card = substream->pcm->card;
1188 	int res;
1189 
1190 	snd_power_lock(card);
1191 	if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1192 		res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1193 	snd_power_unlock(card);
1194 	return res;
1195 }
1196 
1197 #else
1198 
1199 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1200 {
1201 	return -ENOSYS;
1202 }
1203 
1204 #endif /* CONFIG_PM */
1205 
1206 /*
1207  * xrun ioctl
1208  *
1209  * Change the RUNNING stream(s) to XRUN state.
1210  */
1211 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1212 {
1213 	struct snd_card *card = substream->pcm->card;
1214 	struct snd_pcm_runtime *runtime = substream->runtime;
1215 	int result;
1216 
1217 	snd_power_lock(card);
1218 	if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1219 		result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1220 		if (result < 0)
1221 			goto _unlock;
1222 	}
1223 
1224 	snd_pcm_stream_lock_irq(substream);
1225 	switch (runtime->status->state) {
1226 	case SNDRV_PCM_STATE_XRUN:
1227 		result = 0;	/* already there */
1228 		break;
1229 	case SNDRV_PCM_STATE_RUNNING:
1230 		result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1231 		break;
1232 	default:
1233 		result = -EBADFD;
1234 	}
1235 	snd_pcm_stream_unlock_irq(substream);
1236  _unlock:
1237 	snd_power_unlock(card);
1238 	return result;
1239 }
1240 
1241 /*
1242  * reset ioctl
1243  */
1244 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1245 {
1246 	struct snd_pcm_runtime *runtime = substream->runtime;
1247 	switch (runtime->status->state) {
1248 	case SNDRV_PCM_STATE_RUNNING:
1249 	case SNDRV_PCM_STATE_PREPARED:
1250 	case SNDRV_PCM_STATE_PAUSED:
1251 	case SNDRV_PCM_STATE_SUSPENDED:
1252 		return 0;
1253 	default:
1254 		return -EBADFD;
1255 	}
1256 }
1257 
1258 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1259 {
1260 	struct snd_pcm_runtime *runtime = substream->runtime;
1261 	int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1262 	if (err < 0)
1263 		return err;
1264 	runtime->hw_ptr_base = 0;
1265 	runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1266 		runtime->status->hw_ptr % runtime->period_size;
1267 	runtime->silence_start = runtime->status->hw_ptr;
1268 	runtime->silence_filled = 0;
1269 	return 0;
1270 }
1271 
1272 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1273 {
1274 	struct snd_pcm_runtime *runtime = substream->runtime;
1275 	runtime->control->appl_ptr = runtime->status->hw_ptr;
1276 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1277 	    runtime->silence_size > 0)
1278 		snd_pcm_playback_silence(substream, ULONG_MAX);
1279 }
1280 
1281 static struct action_ops snd_pcm_action_reset = {
1282 	.pre_action = snd_pcm_pre_reset,
1283 	.do_action = snd_pcm_do_reset,
1284 	.post_action = snd_pcm_post_reset
1285 };
1286 
1287 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1288 {
1289 	return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1290 }
1291 
1292 /*
1293  * prepare ioctl
1294  */
1295 /* we use the second argument for updating f_flags */
1296 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1297 			       int f_flags)
1298 {
1299 	struct snd_pcm_runtime *runtime = substream->runtime;
1300 	if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1301 	    runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1302 		return -EBADFD;
1303 	if (snd_pcm_running(substream))
1304 		return -EBUSY;
1305 	substream->f_flags = f_flags;
1306 	return 0;
1307 }
1308 
1309 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1310 {
1311 	int err;
1312 	err = substream->ops->prepare(substream);
1313 	if (err < 0)
1314 		return err;
1315 	return snd_pcm_do_reset(substream, 0);
1316 }
1317 
1318 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1319 {
1320 	struct snd_pcm_runtime *runtime = substream->runtime;
1321 	runtime->control->appl_ptr = runtime->status->hw_ptr;
1322 	runtime->status->state = SNDRV_PCM_STATE_PREPARED;
1323 }
1324 
1325 static struct action_ops snd_pcm_action_prepare = {
1326 	.pre_action = snd_pcm_pre_prepare,
1327 	.do_action = snd_pcm_do_prepare,
1328 	.post_action = snd_pcm_post_prepare
1329 };
1330 
1331 /**
1332  * snd_pcm_prepare - prepare the PCM substream to be triggerable
1333  * @substream: the PCM substream instance
1334  * @file: file to refer f_flags
1335  */
1336 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1337 			   struct file *file)
1338 {
1339 	int res;
1340 	struct snd_card *card = substream->pcm->card;
1341 	int f_flags;
1342 
1343 	if (file)
1344 		f_flags = file->f_flags;
1345 	else
1346 		f_flags = substream->f_flags;
1347 
1348 	snd_power_lock(card);
1349 	if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1350 		res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1351 					       substream, f_flags);
1352 	snd_power_unlock(card);
1353 	return res;
1354 }
1355 
1356 /*
1357  * drain ioctl
1358  */
1359 
1360 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1361 {
1362 	substream->runtime->trigger_master = substream;
1363 	return 0;
1364 }
1365 
1366 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1367 {
1368 	struct snd_pcm_runtime *runtime = substream->runtime;
1369 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1370 		switch (runtime->status->state) {
1371 		case SNDRV_PCM_STATE_PREPARED:
1372 			/* start playback stream if possible */
1373 			if (! snd_pcm_playback_empty(substream)) {
1374 				snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1375 				snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1376 			}
1377 			break;
1378 		case SNDRV_PCM_STATE_RUNNING:
1379 			runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1380 			break;
1381 		default:
1382 			break;
1383 		}
1384 	} else {
1385 		/* stop running stream */
1386 		if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1387 			int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1388 				SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1389 			snd_pcm_do_stop(substream, new_state);
1390 			snd_pcm_post_stop(substream, new_state);
1391 		}
1392 	}
1393 	return 0;
1394 }
1395 
1396 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1397 {
1398 }
1399 
1400 static struct action_ops snd_pcm_action_drain_init = {
1401 	.pre_action = snd_pcm_pre_drain_init,
1402 	.do_action = snd_pcm_do_drain_init,
1403 	.post_action = snd_pcm_post_drain_init
1404 };
1405 
1406 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1407 
1408 /*
1409  * Drain the stream(s).
1410  * When the substream is linked, sync until the draining of all playback streams
1411  * is finished.
1412  * After this call, all streams are supposed to be either SETUP or DRAINING
1413  * (capture only) state.
1414  */
1415 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1416 			 struct file *file)
1417 {
1418 	struct snd_card *card;
1419 	struct snd_pcm_runtime *runtime;
1420 	struct snd_pcm_substream *s;
1421 	wait_queue_t wait;
1422 	int result = 0;
1423 	int nonblock = 0;
1424 
1425 	card = substream->pcm->card;
1426 	runtime = substream->runtime;
1427 
1428 	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1429 		return -EBADFD;
1430 
1431 	snd_power_lock(card);
1432 	if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1433 		result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1434 		if (result < 0) {
1435 			snd_power_unlock(card);
1436 			return result;
1437 		}
1438 	}
1439 
1440 	if (file) {
1441 		if (file->f_flags & O_NONBLOCK)
1442 			nonblock = 1;
1443 	} else if (substream->f_flags & O_NONBLOCK)
1444 		nonblock = 1;
1445 
1446 	down_read(&snd_pcm_link_rwsem);
1447 	snd_pcm_stream_lock_irq(substream);
1448 	/* resume pause */
1449 	if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1450 		snd_pcm_pause(substream, 0);
1451 
1452 	/* pre-start/stop - all running streams are changed to DRAINING state */
1453 	result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1454 	if (result < 0)
1455 		goto unlock;
1456 	/* in non-blocking, we don't wait in ioctl but let caller poll */
1457 	if (nonblock) {
1458 		result = -EAGAIN;
1459 		goto unlock;
1460 	}
1461 
1462 	for (;;) {
1463 		long tout;
1464 		struct snd_pcm_runtime *to_check;
1465 		if (signal_pending(current)) {
1466 			result = -ERESTARTSYS;
1467 			break;
1468 		}
1469 		/* find a substream to drain */
1470 		to_check = NULL;
1471 		snd_pcm_group_for_each_entry(s, substream) {
1472 			if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1473 				continue;
1474 			runtime = s->runtime;
1475 			if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1476 				to_check = runtime;
1477 				break;
1478 			}
1479 		}
1480 		if (!to_check)
1481 			break; /* all drained */
1482 		init_waitqueue_entry(&wait, current);
1483 		add_wait_queue(&to_check->sleep, &wait);
1484 		set_current_state(TASK_INTERRUPTIBLE);
1485 		snd_pcm_stream_unlock_irq(substream);
1486 		up_read(&snd_pcm_link_rwsem);
1487 		snd_power_unlock(card);
1488 		tout = schedule_timeout(10 * HZ);
1489 		snd_power_lock(card);
1490 		down_read(&snd_pcm_link_rwsem);
1491 		snd_pcm_stream_lock_irq(substream);
1492 		remove_wait_queue(&to_check->sleep, &wait);
1493 		if (tout == 0) {
1494 			if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1495 				result = -ESTRPIPE;
1496 			else {
1497 				snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1498 				snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1499 				result = -EIO;
1500 			}
1501 			break;
1502 		}
1503 	}
1504 
1505  unlock:
1506 	snd_pcm_stream_unlock_irq(substream);
1507 	up_read(&snd_pcm_link_rwsem);
1508 	snd_power_unlock(card);
1509 
1510 	return result;
1511 }
1512 
1513 /*
1514  * drop ioctl
1515  *
1516  * Immediately put all linked substreams into SETUP state.
1517  */
1518 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1519 {
1520 	struct snd_pcm_runtime *runtime;
1521 	struct snd_card *card;
1522 	int result = 0;
1523 
1524 	if (PCM_RUNTIME_CHECK(substream))
1525 		return -ENXIO;
1526 	runtime = substream->runtime;
1527 	card = substream->pcm->card;
1528 
1529 	if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1530 	    runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1531 	    runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1532 		return -EBADFD;
1533 
1534 	snd_pcm_stream_lock_irq(substream);
1535 	/* resume pause */
1536 	if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1537 		snd_pcm_pause(substream, 0);
1538 
1539 	snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1540 	/* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1541 	snd_pcm_stream_unlock_irq(substream);
1542 
1543 	return result;
1544 }
1545 
1546 
1547 /* WARNING: Don't forget to fput back the file */
1548 static struct file *snd_pcm_file_fd(int fd)
1549 {
1550 	struct file *file;
1551 	struct inode *inode;
1552 	unsigned int minor;
1553 
1554 	file = fget(fd);
1555 	if (!file)
1556 		return NULL;
1557 	inode = file->f_path.dentry->d_inode;
1558 	if (!S_ISCHR(inode->i_mode) ||
1559 	    imajor(inode) != snd_major) {
1560 		fput(file);
1561 		return NULL;
1562 	}
1563 	minor = iminor(inode);
1564 	if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1565 	    !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1566 		fput(file);
1567 		return NULL;
1568 	}
1569 	return file;
1570 }
1571 
1572 /*
1573  * PCM link handling
1574  */
1575 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1576 {
1577 	int res = 0;
1578 	struct file *file;
1579 	struct snd_pcm_file *pcm_file;
1580 	struct snd_pcm_substream *substream1;
1581 
1582 	file = snd_pcm_file_fd(fd);
1583 	if (!file)
1584 		return -EBADFD;
1585 	pcm_file = file->private_data;
1586 	substream1 = pcm_file->substream;
1587 	down_write(&snd_pcm_link_rwsem);
1588 	write_lock_irq(&snd_pcm_link_rwlock);
1589 	if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1590 	    substream->runtime->status->state != substream1->runtime->status->state) {
1591 		res = -EBADFD;
1592 		goto _end;
1593 	}
1594 	if (snd_pcm_stream_linked(substream1)) {
1595 		res = -EALREADY;
1596 		goto _end;
1597 	}
1598 	if (!snd_pcm_stream_linked(substream)) {
1599 		substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC);
1600 		if (substream->group == NULL) {
1601 			res = -ENOMEM;
1602 			goto _end;
1603 		}
1604 		spin_lock_init(&substream->group->lock);
1605 		INIT_LIST_HEAD(&substream->group->substreams);
1606 		list_add_tail(&substream->link_list, &substream->group->substreams);
1607 		substream->group->count = 1;
1608 	}
1609 	list_add_tail(&substream1->link_list, &substream->group->substreams);
1610 	substream->group->count++;
1611 	substream1->group = substream->group;
1612  _end:
1613 	write_unlock_irq(&snd_pcm_link_rwlock);
1614 	up_write(&snd_pcm_link_rwsem);
1615 	fput(file);
1616 	return res;
1617 }
1618 
1619 static void relink_to_local(struct snd_pcm_substream *substream)
1620 {
1621 	substream->group = &substream->self_group;
1622 	INIT_LIST_HEAD(&substream->self_group.substreams);
1623 	list_add_tail(&substream->link_list, &substream->self_group.substreams);
1624 }
1625 
1626 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1627 {
1628 	struct snd_pcm_substream *s;
1629 	int res = 0;
1630 
1631 	down_write(&snd_pcm_link_rwsem);
1632 	write_lock_irq(&snd_pcm_link_rwlock);
1633 	if (!snd_pcm_stream_linked(substream)) {
1634 		res = -EALREADY;
1635 		goto _end;
1636 	}
1637 	list_del(&substream->link_list);
1638 	substream->group->count--;
1639 	if (substream->group->count == 1) {	/* detach the last stream, too */
1640 		snd_pcm_group_for_each_entry(s, substream) {
1641 			relink_to_local(s);
1642 			break;
1643 		}
1644 		kfree(substream->group);
1645 	}
1646 	relink_to_local(substream);
1647        _end:
1648 	write_unlock_irq(&snd_pcm_link_rwlock);
1649 	up_write(&snd_pcm_link_rwsem);
1650 	return res;
1651 }
1652 
1653 /*
1654  * hw configurator
1655  */
1656 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1657 			       struct snd_pcm_hw_rule *rule)
1658 {
1659 	struct snd_interval t;
1660 	snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1661 		     hw_param_interval_c(params, rule->deps[1]), &t);
1662 	return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1663 }
1664 
1665 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1666 			       struct snd_pcm_hw_rule *rule)
1667 {
1668 	struct snd_interval t;
1669 	snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1670 		     hw_param_interval_c(params, rule->deps[1]), &t);
1671 	return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1672 }
1673 
1674 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1675 				   struct snd_pcm_hw_rule *rule)
1676 {
1677 	struct snd_interval t;
1678 	snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1679 			 hw_param_interval_c(params, rule->deps[1]),
1680 			 (unsigned long) rule->private, &t);
1681 	return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1682 }
1683 
1684 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1685 				   struct snd_pcm_hw_rule *rule)
1686 {
1687 	struct snd_interval t;
1688 	snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1689 			 (unsigned long) rule->private,
1690 			 hw_param_interval_c(params, rule->deps[1]), &t);
1691 	return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1692 }
1693 
1694 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1695 				  struct snd_pcm_hw_rule *rule)
1696 {
1697 	unsigned int k;
1698 	struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1699 	struct snd_mask m;
1700 	struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1701 	snd_mask_any(&m);
1702 	for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1703 		int bits;
1704 		if (! snd_mask_test(mask, k))
1705 			continue;
1706 		bits = snd_pcm_format_physical_width(k);
1707 		if (bits <= 0)
1708 			continue; /* ignore invalid formats */
1709 		if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1710 			snd_mask_reset(&m, k);
1711 	}
1712 	return snd_mask_refine(mask, &m);
1713 }
1714 
1715 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1716 				       struct snd_pcm_hw_rule *rule)
1717 {
1718 	struct snd_interval t;
1719 	unsigned int k;
1720 	t.min = UINT_MAX;
1721 	t.max = 0;
1722 	t.openmin = 0;
1723 	t.openmax = 0;
1724 	for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1725 		int bits;
1726 		if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1727 			continue;
1728 		bits = snd_pcm_format_physical_width(k);
1729 		if (bits <= 0)
1730 			continue; /* ignore invalid formats */
1731 		if (t.min > (unsigned)bits)
1732 			t.min = bits;
1733 		if (t.max < (unsigned)bits)
1734 			t.max = bits;
1735 	}
1736 	t.integer = 1;
1737 	return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1738 }
1739 
1740 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1741 #error "Change this table"
1742 #endif
1743 
1744 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1745                                  48000, 64000, 88200, 96000, 176400, 192000 };
1746 
1747 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1748 	.count = ARRAY_SIZE(rates),
1749 	.list = rates,
1750 };
1751 
1752 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1753 				struct snd_pcm_hw_rule *rule)
1754 {
1755 	struct snd_pcm_hardware *hw = rule->private;
1756 	return snd_interval_list(hw_param_interval(params, rule->var),
1757 				 snd_pcm_known_rates.count,
1758 				 snd_pcm_known_rates.list, hw->rates);
1759 }
1760 
1761 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1762 					    struct snd_pcm_hw_rule *rule)
1763 {
1764 	struct snd_interval t;
1765 	struct snd_pcm_substream *substream = rule->private;
1766 	t.min = 0;
1767 	t.max = substream->buffer_bytes_max;
1768 	t.openmin = 0;
1769 	t.openmax = 0;
1770 	t.integer = 1;
1771 	return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1772 }
1773 
1774 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1775 {
1776 	struct snd_pcm_runtime *runtime = substream->runtime;
1777 	struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1778 	int k, err;
1779 
1780 	for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1781 		snd_mask_any(constrs_mask(constrs, k));
1782 	}
1783 
1784 	for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1785 		snd_interval_any(constrs_interval(constrs, k));
1786 	}
1787 
1788 	snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1789 	snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1790 	snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1791 	snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1792 	snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1793 
1794 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1795 				   snd_pcm_hw_rule_format, NULL,
1796 				   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1797 	if (err < 0)
1798 		return err;
1799 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1800 				  snd_pcm_hw_rule_sample_bits, NULL,
1801 				  SNDRV_PCM_HW_PARAM_FORMAT,
1802 				  SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1803 	if (err < 0)
1804 		return err;
1805 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1806 				  snd_pcm_hw_rule_div, NULL,
1807 				  SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1808 	if (err < 0)
1809 		return err;
1810 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1811 				  snd_pcm_hw_rule_mul, NULL,
1812 				  SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1813 	if (err < 0)
1814 		return err;
1815 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1816 				  snd_pcm_hw_rule_mulkdiv, (void*) 8,
1817 				  SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1818 	if (err < 0)
1819 		return err;
1820 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1821 				  snd_pcm_hw_rule_mulkdiv, (void*) 8,
1822 				  SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1823 	if (err < 0)
1824 		return err;
1825 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1826 				  snd_pcm_hw_rule_div, NULL,
1827 				  SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1828 	if (err < 0)
1829 		return err;
1830 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1831 				  snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1832 				  SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1833 	if (err < 0)
1834 		return err;
1835 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1836 				  snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1837 				  SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1838 	if (err < 0)
1839 		return err;
1840 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1841 				  snd_pcm_hw_rule_div, NULL,
1842 				  SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1843 	if (err < 0)
1844 		return err;
1845 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1846 				  snd_pcm_hw_rule_div, NULL,
1847 				  SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1848 	if (err < 0)
1849 		return err;
1850 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1851 				  snd_pcm_hw_rule_mulkdiv, (void*) 8,
1852 				  SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1853 	if (err < 0)
1854 		return err;
1855 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1856 				  snd_pcm_hw_rule_muldivk, (void*) 1000000,
1857 				  SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1858 	if (err < 0)
1859 		return err;
1860 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1861 				  snd_pcm_hw_rule_mul, NULL,
1862 				  SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1863 	if (err < 0)
1864 		return err;
1865 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1866 				  snd_pcm_hw_rule_mulkdiv, (void*) 8,
1867 				  SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1868 	if (err < 0)
1869 		return err;
1870 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1871 				  snd_pcm_hw_rule_muldivk, (void*) 1000000,
1872 				  SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1873 	if (err < 0)
1874 		return err;
1875 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1876 				  snd_pcm_hw_rule_muldivk, (void*) 8,
1877 				  SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1878 	if (err < 0)
1879 		return err;
1880 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1881 				  snd_pcm_hw_rule_muldivk, (void*) 8,
1882 				  SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1883 	if (err < 0)
1884 		return err;
1885 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1886 				  snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1887 				  SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1888 	if (err < 0)
1889 		return err;
1890 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1891 				  snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1892 				  SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1893 	if (err < 0)
1894 		return err;
1895 	return 0;
1896 }
1897 
1898 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1899 {
1900 	struct snd_pcm_runtime *runtime = substream->runtime;
1901 	struct snd_pcm_hardware *hw = &runtime->hw;
1902 	int err;
1903 	unsigned int mask = 0;
1904 
1905         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1906 		mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1907         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1908 		mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1909 	if (hw->info & SNDRV_PCM_INFO_MMAP) {
1910 		if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1911 			mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1912 		if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1913 			mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1914 		if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1915 			mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1916 	}
1917 	err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1918 	if (err < 0)
1919 		return err;
1920 
1921 	err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1922 	if (err < 0)
1923 		return err;
1924 
1925 	err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1926 	if (err < 0)
1927 		return err;
1928 
1929 	err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1930 					   hw->channels_min, hw->channels_max);
1931 	if (err < 0)
1932 		return err;
1933 
1934 	err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1935 					   hw->rate_min, hw->rate_max);
1936 	if (err < 0)
1937 		return err;
1938 
1939 	err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1940 					   hw->period_bytes_min, hw->period_bytes_max);
1941 	if (err < 0)
1942 		return err;
1943 
1944 	err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1945 					   hw->periods_min, hw->periods_max);
1946 	if (err < 0)
1947 		return err;
1948 
1949 	err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1950 					   hw->period_bytes_min, hw->buffer_bytes_max);
1951 	if (err < 0)
1952 		return err;
1953 
1954 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1955 				  snd_pcm_hw_rule_buffer_bytes_max, substream,
1956 				  SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1957 	if (err < 0)
1958 		return err;
1959 
1960 	/* FIXME: remove */
1961 	if (runtime->dma_bytes) {
1962 		err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
1963 		if (err < 0)
1964 			return -EINVAL;
1965 	}
1966 
1967 	if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
1968 		err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1969 					  snd_pcm_hw_rule_rate, hw,
1970 					  SNDRV_PCM_HW_PARAM_RATE, -1);
1971 		if (err < 0)
1972 			return err;
1973 	}
1974 
1975 	/* FIXME: this belong to lowlevel */
1976 	snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
1977 
1978 	return 0;
1979 }
1980 
1981 static void pcm_release_private(struct snd_pcm_substream *substream)
1982 {
1983 	snd_pcm_unlink(substream);
1984 }
1985 
1986 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
1987 {
1988 	substream->ref_count--;
1989 	if (substream->ref_count > 0)
1990 		return;
1991 
1992 	snd_pcm_drop(substream);
1993 	if (substream->hw_opened) {
1994 		if (substream->ops->hw_free != NULL)
1995 			substream->ops->hw_free(substream);
1996 		substream->ops->close(substream);
1997 		substream->hw_opened = 0;
1998 	}
1999 	if (pm_qos_request_active(&substream->latency_pm_qos_req))
2000 		pm_qos_remove_request(&substream->latency_pm_qos_req);
2001 	if (substream->pcm_release) {
2002 		substream->pcm_release(substream);
2003 		substream->pcm_release = NULL;
2004 	}
2005 	snd_pcm_detach_substream(substream);
2006 }
2007 
2008 EXPORT_SYMBOL(snd_pcm_release_substream);
2009 
2010 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2011 			   struct file *file,
2012 			   struct snd_pcm_substream **rsubstream)
2013 {
2014 	struct snd_pcm_substream *substream;
2015 	int err;
2016 
2017 	err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2018 	if (err < 0)
2019 		return err;
2020 	if (substream->ref_count > 1) {
2021 		*rsubstream = substream;
2022 		return 0;
2023 	}
2024 
2025 	err = snd_pcm_hw_constraints_init(substream);
2026 	if (err < 0) {
2027 		snd_printd("snd_pcm_hw_constraints_init failed\n");
2028 		goto error;
2029 	}
2030 
2031 	if ((err = substream->ops->open(substream)) < 0)
2032 		goto error;
2033 
2034 	substream->hw_opened = 1;
2035 
2036 	err = snd_pcm_hw_constraints_complete(substream);
2037 	if (err < 0) {
2038 		snd_printd("snd_pcm_hw_constraints_complete failed\n");
2039 		goto error;
2040 	}
2041 
2042 	*rsubstream = substream;
2043 	return 0;
2044 
2045  error:
2046 	snd_pcm_release_substream(substream);
2047 	return err;
2048 }
2049 
2050 EXPORT_SYMBOL(snd_pcm_open_substream);
2051 
2052 static int snd_pcm_open_file(struct file *file,
2053 			     struct snd_pcm *pcm,
2054 			     int stream,
2055 			     struct snd_pcm_file **rpcm_file)
2056 {
2057 	struct snd_pcm_file *pcm_file;
2058 	struct snd_pcm_substream *substream;
2059 	struct snd_pcm_str *str;
2060 	int err;
2061 
2062 	if (rpcm_file)
2063 		*rpcm_file = NULL;
2064 
2065 	err = snd_pcm_open_substream(pcm, stream, file, &substream);
2066 	if (err < 0)
2067 		return err;
2068 
2069 	pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2070 	if (pcm_file == NULL) {
2071 		snd_pcm_release_substream(substream);
2072 		return -ENOMEM;
2073 	}
2074 	pcm_file->substream = substream;
2075 	if (substream->ref_count == 1) {
2076 		str = substream->pstr;
2077 		substream->file = pcm_file;
2078 		substream->pcm_release = pcm_release_private;
2079 	}
2080 	file->private_data = pcm_file;
2081 	if (rpcm_file)
2082 		*rpcm_file = pcm_file;
2083 	return 0;
2084 }
2085 
2086 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2087 {
2088 	struct snd_pcm *pcm;
2089 	int err = nonseekable_open(inode, file);
2090 	if (err < 0)
2091 		return err;
2092 	pcm = snd_lookup_minor_data(iminor(inode),
2093 				    SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2094 	return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2095 }
2096 
2097 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2098 {
2099 	struct snd_pcm *pcm;
2100 	int err = nonseekable_open(inode, file);
2101 	if (err < 0)
2102 		return err;
2103 	pcm = snd_lookup_minor_data(iminor(inode),
2104 				    SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2105 	return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2106 }
2107 
2108 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2109 {
2110 	int err;
2111 	struct snd_pcm_file *pcm_file;
2112 	wait_queue_t wait;
2113 
2114 	if (pcm == NULL) {
2115 		err = -ENODEV;
2116 		goto __error1;
2117 	}
2118 	err = snd_card_file_add(pcm->card, file);
2119 	if (err < 0)
2120 		goto __error1;
2121 	if (!try_module_get(pcm->card->module)) {
2122 		err = -EFAULT;
2123 		goto __error2;
2124 	}
2125 	init_waitqueue_entry(&wait, current);
2126 	add_wait_queue(&pcm->open_wait, &wait);
2127 	mutex_lock(&pcm->open_mutex);
2128 	while (1) {
2129 		err = snd_pcm_open_file(file, pcm, stream, &pcm_file);
2130 		if (err >= 0)
2131 			break;
2132 		if (err == -EAGAIN) {
2133 			if (file->f_flags & O_NONBLOCK) {
2134 				err = -EBUSY;
2135 				break;
2136 			}
2137 		} else
2138 			break;
2139 		set_current_state(TASK_INTERRUPTIBLE);
2140 		mutex_unlock(&pcm->open_mutex);
2141 		schedule();
2142 		mutex_lock(&pcm->open_mutex);
2143 		if (signal_pending(current)) {
2144 			err = -ERESTARTSYS;
2145 			break;
2146 		}
2147 	}
2148 	remove_wait_queue(&pcm->open_wait, &wait);
2149 	mutex_unlock(&pcm->open_mutex);
2150 	if (err < 0)
2151 		goto __error;
2152 	return err;
2153 
2154       __error:
2155 	module_put(pcm->card->module);
2156       __error2:
2157       	snd_card_file_remove(pcm->card, file);
2158       __error1:
2159       	return err;
2160 }
2161 
2162 static int snd_pcm_release(struct inode *inode, struct file *file)
2163 {
2164 	struct snd_pcm *pcm;
2165 	struct snd_pcm_substream *substream;
2166 	struct snd_pcm_file *pcm_file;
2167 
2168 	pcm_file = file->private_data;
2169 	substream = pcm_file->substream;
2170 	if (snd_BUG_ON(!substream))
2171 		return -ENXIO;
2172 	pcm = substream->pcm;
2173 	mutex_lock(&pcm->open_mutex);
2174 	snd_pcm_release_substream(substream);
2175 	kfree(pcm_file);
2176 	mutex_unlock(&pcm->open_mutex);
2177 	wake_up(&pcm->open_wait);
2178 	module_put(pcm->card->module);
2179 	snd_card_file_remove(pcm->card, file);
2180 	return 0;
2181 }
2182 
2183 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2184 						 snd_pcm_uframes_t frames)
2185 {
2186 	struct snd_pcm_runtime *runtime = substream->runtime;
2187 	snd_pcm_sframes_t appl_ptr;
2188 	snd_pcm_sframes_t ret;
2189 	snd_pcm_sframes_t hw_avail;
2190 
2191 	if (frames == 0)
2192 		return 0;
2193 
2194 	snd_pcm_stream_lock_irq(substream);
2195 	switch (runtime->status->state) {
2196 	case SNDRV_PCM_STATE_PREPARED:
2197 		break;
2198 	case SNDRV_PCM_STATE_DRAINING:
2199 	case SNDRV_PCM_STATE_RUNNING:
2200 		if (snd_pcm_update_hw_ptr(substream) >= 0)
2201 			break;
2202 		/* Fall through */
2203 	case SNDRV_PCM_STATE_XRUN:
2204 		ret = -EPIPE;
2205 		goto __end;
2206 	case SNDRV_PCM_STATE_SUSPENDED:
2207 		ret = -ESTRPIPE;
2208 		goto __end;
2209 	default:
2210 		ret = -EBADFD;
2211 		goto __end;
2212 	}
2213 
2214 	hw_avail = snd_pcm_playback_hw_avail(runtime);
2215 	if (hw_avail <= 0) {
2216 		ret = 0;
2217 		goto __end;
2218 	}
2219 	if (frames > (snd_pcm_uframes_t)hw_avail)
2220 		frames = hw_avail;
2221 	appl_ptr = runtime->control->appl_ptr - frames;
2222 	if (appl_ptr < 0)
2223 		appl_ptr += runtime->boundary;
2224 	runtime->control->appl_ptr = appl_ptr;
2225 	ret = frames;
2226  __end:
2227 	snd_pcm_stream_unlock_irq(substream);
2228 	return ret;
2229 }
2230 
2231 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2232 						snd_pcm_uframes_t frames)
2233 {
2234 	struct snd_pcm_runtime *runtime = substream->runtime;
2235 	snd_pcm_sframes_t appl_ptr;
2236 	snd_pcm_sframes_t ret;
2237 	snd_pcm_sframes_t hw_avail;
2238 
2239 	if (frames == 0)
2240 		return 0;
2241 
2242 	snd_pcm_stream_lock_irq(substream);
2243 	switch (runtime->status->state) {
2244 	case SNDRV_PCM_STATE_PREPARED:
2245 	case SNDRV_PCM_STATE_DRAINING:
2246 		break;
2247 	case SNDRV_PCM_STATE_RUNNING:
2248 		if (snd_pcm_update_hw_ptr(substream) >= 0)
2249 			break;
2250 		/* Fall through */
2251 	case SNDRV_PCM_STATE_XRUN:
2252 		ret = -EPIPE;
2253 		goto __end;
2254 	case SNDRV_PCM_STATE_SUSPENDED:
2255 		ret = -ESTRPIPE;
2256 		goto __end;
2257 	default:
2258 		ret = -EBADFD;
2259 		goto __end;
2260 	}
2261 
2262 	hw_avail = snd_pcm_capture_hw_avail(runtime);
2263 	if (hw_avail <= 0) {
2264 		ret = 0;
2265 		goto __end;
2266 	}
2267 	if (frames > (snd_pcm_uframes_t)hw_avail)
2268 		frames = hw_avail;
2269 	appl_ptr = runtime->control->appl_ptr - frames;
2270 	if (appl_ptr < 0)
2271 		appl_ptr += runtime->boundary;
2272 	runtime->control->appl_ptr = appl_ptr;
2273 	ret = frames;
2274  __end:
2275 	snd_pcm_stream_unlock_irq(substream);
2276 	return ret;
2277 }
2278 
2279 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2280 						  snd_pcm_uframes_t frames)
2281 {
2282 	struct snd_pcm_runtime *runtime = substream->runtime;
2283 	snd_pcm_sframes_t appl_ptr;
2284 	snd_pcm_sframes_t ret;
2285 	snd_pcm_sframes_t avail;
2286 
2287 	if (frames == 0)
2288 		return 0;
2289 
2290 	snd_pcm_stream_lock_irq(substream);
2291 	switch (runtime->status->state) {
2292 	case SNDRV_PCM_STATE_PREPARED:
2293 	case SNDRV_PCM_STATE_PAUSED:
2294 		break;
2295 	case SNDRV_PCM_STATE_DRAINING:
2296 	case SNDRV_PCM_STATE_RUNNING:
2297 		if (snd_pcm_update_hw_ptr(substream) >= 0)
2298 			break;
2299 		/* Fall through */
2300 	case SNDRV_PCM_STATE_XRUN:
2301 		ret = -EPIPE;
2302 		goto __end;
2303 	case SNDRV_PCM_STATE_SUSPENDED:
2304 		ret = -ESTRPIPE;
2305 		goto __end;
2306 	default:
2307 		ret = -EBADFD;
2308 		goto __end;
2309 	}
2310 
2311 	avail = snd_pcm_playback_avail(runtime);
2312 	if (avail <= 0) {
2313 		ret = 0;
2314 		goto __end;
2315 	}
2316 	if (frames > (snd_pcm_uframes_t)avail)
2317 		frames = avail;
2318 	appl_ptr = runtime->control->appl_ptr + frames;
2319 	if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2320 		appl_ptr -= runtime->boundary;
2321 	runtime->control->appl_ptr = appl_ptr;
2322 	ret = frames;
2323  __end:
2324 	snd_pcm_stream_unlock_irq(substream);
2325 	return ret;
2326 }
2327 
2328 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2329 						 snd_pcm_uframes_t frames)
2330 {
2331 	struct snd_pcm_runtime *runtime = substream->runtime;
2332 	snd_pcm_sframes_t appl_ptr;
2333 	snd_pcm_sframes_t ret;
2334 	snd_pcm_sframes_t avail;
2335 
2336 	if (frames == 0)
2337 		return 0;
2338 
2339 	snd_pcm_stream_lock_irq(substream);
2340 	switch (runtime->status->state) {
2341 	case SNDRV_PCM_STATE_PREPARED:
2342 	case SNDRV_PCM_STATE_DRAINING:
2343 	case SNDRV_PCM_STATE_PAUSED:
2344 		break;
2345 	case SNDRV_PCM_STATE_RUNNING:
2346 		if (snd_pcm_update_hw_ptr(substream) >= 0)
2347 			break;
2348 		/* Fall through */
2349 	case SNDRV_PCM_STATE_XRUN:
2350 		ret = -EPIPE;
2351 		goto __end;
2352 	case SNDRV_PCM_STATE_SUSPENDED:
2353 		ret = -ESTRPIPE;
2354 		goto __end;
2355 	default:
2356 		ret = -EBADFD;
2357 		goto __end;
2358 	}
2359 
2360 	avail = snd_pcm_capture_avail(runtime);
2361 	if (avail <= 0) {
2362 		ret = 0;
2363 		goto __end;
2364 	}
2365 	if (frames > (snd_pcm_uframes_t)avail)
2366 		frames = avail;
2367 	appl_ptr = runtime->control->appl_ptr + frames;
2368 	if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2369 		appl_ptr -= runtime->boundary;
2370 	runtime->control->appl_ptr = appl_ptr;
2371 	ret = frames;
2372  __end:
2373 	snd_pcm_stream_unlock_irq(substream);
2374 	return ret;
2375 }
2376 
2377 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2378 {
2379 	struct snd_pcm_runtime *runtime = substream->runtime;
2380 	int err;
2381 
2382 	snd_pcm_stream_lock_irq(substream);
2383 	switch (runtime->status->state) {
2384 	case SNDRV_PCM_STATE_DRAINING:
2385 		if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2386 			goto __badfd;
2387 	case SNDRV_PCM_STATE_RUNNING:
2388 		if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2389 			break;
2390 		/* Fall through */
2391 	case SNDRV_PCM_STATE_PREPARED:
2392 	case SNDRV_PCM_STATE_SUSPENDED:
2393 		err = 0;
2394 		break;
2395 	case SNDRV_PCM_STATE_XRUN:
2396 		err = -EPIPE;
2397 		break;
2398 	default:
2399 	      __badfd:
2400 		err = -EBADFD;
2401 		break;
2402 	}
2403 	snd_pcm_stream_unlock_irq(substream);
2404 	return err;
2405 }
2406 
2407 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2408 			 snd_pcm_sframes_t __user *res)
2409 {
2410 	struct snd_pcm_runtime *runtime = substream->runtime;
2411 	int err;
2412 	snd_pcm_sframes_t n = 0;
2413 
2414 	snd_pcm_stream_lock_irq(substream);
2415 	switch (runtime->status->state) {
2416 	case SNDRV_PCM_STATE_DRAINING:
2417 		if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2418 			goto __badfd;
2419 	case SNDRV_PCM_STATE_RUNNING:
2420 		if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2421 			break;
2422 		/* Fall through */
2423 	case SNDRV_PCM_STATE_PREPARED:
2424 	case SNDRV_PCM_STATE_SUSPENDED:
2425 		err = 0;
2426 		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2427 			n = snd_pcm_playback_hw_avail(runtime);
2428 		else
2429 			n = snd_pcm_capture_avail(runtime);
2430 		n += runtime->delay;
2431 		break;
2432 	case SNDRV_PCM_STATE_XRUN:
2433 		err = -EPIPE;
2434 		break;
2435 	default:
2436 	      __badfd:
2437 		err = -EBADFD;
2438 		break;
2439 	}
2440 	snd_pcm_stream_unlock_irq(substream);
2441 	if (!err)
2442 		if (put_user(n, res))
2443 			err = -EFAULT;
2444 	return err;
2445 }
2446 
2447 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2448 			    struct snd_pcm_sync_ptr __user *_sync_ptr)
2449 {
2450 	struct snd_pcm_runtime *runtime = substream->runtime;
2451 	struct snd_pcm_sync_ptr sync_ptr;
2452 	volatile struct snd_pcm_mmap_status *status;
2453 	volatile struct snd_pcm_mmap_control *control;
2454 	int err;
2455 
2456 	memset(&sync_ptr, 0, sizeof(sync_ptr));
2457 	if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2458 		return -EFAULT;
2459 	if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2460 		return -EFAULT;
2461 	status = runtime->status;
2462 	control = runtime->control;
2463 	if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2464 		err = snd_pcm_hwsync(substream);
2465 		if (err < 0)
2466 			return err;
2467 	}
2468 	snd_pcm_stream_lock_irq(substream);
2469 	if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2470 		control->appl_ptr = sync_ptr.c.control.appl_ptr;
2471 	else
2472 		sync_ptr.c.control.appl_ptr = control->appl_ptr;
2473 	if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2474 		control->avail_min = sync_ptr.c.control.avail_min;
2475 	else
2476 		sync_ptr.c.control.avail_min = control->avail_min;
2477 	sync_ptr.s.status.state = status->state;
2478 	sync_ptr.s.status.hw_ptr = status->hw_ptr;
2479 	sync_ptr.s.status.tstamp = status->tstamp;
2480 	sync_ptr.s.status.suspended_state = status->suspended_state;
2481 	snd_pcm_stream_unlock_irq(substream);
2482 	if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2483 		return -EFAULT;
2484 	return 0;
2485 }
2486 
2487 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2488 {
2489 	struct snd_pcm_runtime *runtime = substream->runtime;
2490 	int arg;
2491 
2492 	if (get_user(arg, _arg))
2493 		return -EFAULT;
2494 	if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2495 		return -EINVAL;
2496 	runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2497 	if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2498 		runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2499 	return 0;
2500 }
2501 
2502 static int snd_pcm_common_ioctl1(struct file *file,
2503 				 struct snd_pcm_substream *substream,
2504 				 unsigned int cmd, void __user *arg)
2505 {
2506 	switch (cmd) {
2507 	case SNDRV_PCM_IOCTL_PVERSION:
2508 		return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2509 	case SNDRV_PCM_IOCTL_INFO:
2510 		return snd_pcm_info_user(substream, arg);
2511 	case SNDRV_PCM_IOCTL_TSTAMP:	/* just for compatibility */
2512 		return 0;
2513 	case SNDRV_PCM_IOCTL_TTSTAMP:
2514 		return snd_pcm_tstamp(substream, arg);
2515 	case SNDRV_PCM_IOCTL_HW_REFINE:
2516 		return snd_pcm_hw_refine_user(substream, arg);
2517 	case SNDRV_PCM_IOCTL_HW_PARAMS:
2518 		return snd_pcm_hw_params_user(substream, arg);
2519 	case SNDRV_PCM_IOCTL_HW_FREE:
2520 		return snd_pcm_hw_free(substream);
2521 	case SNDRV_PCM_IOCTL_SW_PARAMS:
2522 		return snd_pcm_sw_params_user(substream, arg);
2523 	case SNDRV_PCM_IOCTL_STATUS:
2524 		return snd_pcm_status_user(substream, arg);
2525 	case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2526 		return snd_pcm_channel_info_user(substream, arg);
2527 	case SNDRV_PCM_IOCTL_PREPARE:
2528 		return snd_pcm_prepare(substream, file);
2529 	case SNDRV_PCM_IOCTL_RESET:
2530 		return snd_pcm_reset(substream);
2531 	case SNDRV_PCM_IOCTL_START:
2532 		return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2533 	case SNDRV_PCM_IOCTL_LINK:
2534 		return snd_pcm_link(substream, (int)(unsigned long) arg);
2535 	case SNDRV_PCM_IOCTL_UNLINK:
2536 		return snd_pcm_unlink(substream);
2537 	case SNDRV_PCM_IOCTL_RESUME:
2538 		return snd_pcm_resume(substream);
2539 	case SNDRV_PCM_IOCTL_XRUN:
2540 		return snd_pcm_xrun(substream);
2541 	case SNDRV_PCM_IOCTL_HWSYNC:
2542 		return snd_pcm_hwsync(substream);
2543 	case SNDRV_PCM_IOCTL_DELAY:
2544 		return snd_pcm_delay(substream, arg);
2545 	case SNDRV_PCM_IOCTL_SYNC_PTR:
2546 		return snd_pcm_sync_ptr(substream, arg);
2547 #ifdef CONFIG_SND_SUPPORT_OLD_API
2548 	case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2549 		return snd_pcm_hw_refine_old_user(substream, arg);
2550 	case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2551 		return snd_pcm_hw_params_old_user(substream, arg);
2552 #endif
2553 	case SNDRV_PCM_IOCTL_DRAIN:
2554 		return snd_pcm_drain(substream, file);
2555 	case SNDRV_PCM_IOCTL_DROP:
2556 		return snd_pcm_drop(substream);
2557 	case SNDRV_PCM_IOCTL_PAUSE:
2558 	{
2559 		int res;
2560 		snd_pcm_stream_lock_irq(substream);
2561 		res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2562 		snd_pcm_stream_unlock_irq(substream);
2563 		return res;
2564 	}
2565 	}
2566 	snd_printd("unknown ioctl = 0x%x\n", cmd);
2567 	return -ENOTTY;
2568 }
2569 
2570 static int snd_pcm_playback_ioctl1(struct file *file,
2571 				   struct snd_pcm_substream *substream,
2572 				   unsigned int cmd, void __user *arg)
2573 {
2574 	if (snd_BUG_ON(!substream))
2575 		return -ENXIO;
2576 	if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2577 		return -EINVAL;
2578 	switch (cmd) {
2579 	case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2580 	{
2581 		struct snd_xferi xferi;
2582 		struct snd_xferi __user *_xferi = arg;
2583 		struct snd_pcm_runtime *runtime = substream->runtime;
2584 		snd_pcm_sframes_t result;
2585 		if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2586 			return -EBADFD;
2587 		if (put_user(0, &_xferi->result))
2588 			return -EFAULT;
2589 		if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2590 			return -EFAULT;
2591 		result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2592 		__put_user(result, &_xferi->result);
2593 		return result < 0 ? result : 0;
2594 	}
2595 	case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2596 	{
2597 		struct snd_xfern xfern;
2598 		struct snd_xfern __user *_xfern = arg;
2599 		struct snd_pcm_runtime *runtime = substream->runtime;
2600 		void __user **bufs;
2601 		snd_pcm_sframes_t result;
2602 		if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2603 			return -EBADFD;
2604 		if (runtime->channels > 128)
2605 			return -EINVAL;
2606 		if (put_user(0, &_xfern->result))
2607 			return -EFAULT;
2608 		if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2609 			return -EFAULT;
2610 
2611 		bufs = memdup_user(xfern.bufs,
2612 				   sizeof(void *) * runtime->channels);
2613 		if (IS_ERR(bufs))
2614 			return PTR_ERR(bufs);
2615 		result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2616 		kfree(bufs);
2617 		__put_user(result, &_xfern->result);
2618 		return result < 0 ? result : 0;
2619 	}
2620 	case SNDRV_PCM_IOCTL_REWIND:
2621 	{
2622 		snd_pcm_uframes_t frames;
2623 		snd_pcm_uframes_t __user *_frames = arg;
2624 		snd_pcm_sframes_t result;
2625 		if (get_user(frames, _frames))
2626 			return -EFAULT;
2627 		if (put_user(0, _frames))
2628 			return -EFAULT;
2629 		result = snd_pcm_playback_rewind(substream, frames);
2630 		__put_user(result, _frames);
2631 		return result < 0 ? result : 0;
2632 	}
2633 	case SNDRV_PCM_IOCTL_FORWARD:
2634 	{
2635 		snd_pcm_uframes_t frames;
2636 		snd_pcm_uframes_t __user *_frames = arg;
2637 		snd_pcm_sframes_t result;
2638 		if (get_user(frames, _frames))
2639 			return -EFAULT;
2640 		if (put_user(0, _frames))
2641 			return -EFAULT;
2642 		result = snd_pcm_playback_forward(substream, frames);
2643 		__put_user(result, _frames);
2644 		return result < 0 ? result : 0;
2645 	}
2646 	}
2647 	return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2648 }
2649 
2650 static int snd_pcm_capture_ioctl1(struct file *file,
2651 				  struct snd_pcm_substream *substream,
2652 				  unsigned int cmd, void __user *arg)
2653 {
2654 	if (snd_BUG_ON(!substream))
2655 		return -ENXIO;
2656 	if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2657 		return -EINVAL;
2658 	switch (cmd) {
2659 	case SNDRV_PCM_IOCTL_READI_FRAMES:
2660 	{
2661 		struct snd_xferi xferi;
2662 		struct snd_xferi __user *_xferi = arg;
2663 		struct snd_pcm_runtime *runtime = substream->runtime;
2664 		snd_pcm_sframes_t result;
2665 		if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2666 			return -EBADFD;
2667 		if (put_user(0, &_xferi->result))
2668 			return -EFAULT;
2669 		if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2670 			return -EFAULT;
2671 		result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2672 		__put_user(result, &_xferi->result);
2673 		return result < 0 ? result : 0;
2674 	}
2675 	case SNDRV_PCM_IOCTL_READN_FRAMES:
2676 	{
2677 		struct snd_xfern xfern;
2678 		struct snd_xfern __user *_xfern = arg;
2679 		struct snd_pcm_runtime *runtime = substream->runtime;
2680 		void *bufs;
2681 		snd_pcm_sframes_t result;
2682 		if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2683 			return -EBADFD;
2684 		if (runtime->channels > 128)
2685 			return -EINVAL;
2686 		if (put_user(0, &_xfern->result))
2687 			return -EFAULT;
2688 		if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2689 			return -EFAULT;
2690 
2691 		bufs = memdup_user(xfern.bufs,
2692 				   sizeof(void *) * runtime->channels);
2693 		if (IS_ERR(bufs))
2694 			return PTR_ERR(bufs);
2695 		result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2696 		kfree(bufs);
2697 		__put_user(result, &_xfern->result);
2698 		return result < 0 ? result : 0;
2699 	}
2700 	case SNDRV_PCM_IOCTL_REWIND:
2701 	{
2702 		snd_pcm_uframes_t frames;
2703 		snd_pcm_uframes_t __user *_frames = arg;
2704 		snd_pcm_sframes_t result;
2705 		if (get_user(frames, _frames))
2706 			return -EFAULT;
2707 		if (put_user(0, _frames))
2708 			return -EFAULT;
2709 		result = snd_pcm_capture_rewind(substream, frames);
2710 		__put_user(result, _frames);
2711 		return result < 0 ? result : 0;
2712 	}
2713 	case SNDRV_PCM_IOCTL_FORWARD:
2714 	{
2715 		snd_pcm_uframes_t frames;
2716 		snd_pcm_uframes_t __user *_frames = arg;
2717 		snd_pcm_sframes_t result;
2718 		if (get_user(frames, _frames))
2719 			return -EFAULT;
2720 		if (put_user(0, _frames))
2721 			return -EFAULT;
2722 		result = snd_pcm_capture_forward(substream, frames);
2723 		__put_user(result, _frames);
2724 		return result < 0 ? result : 0;
2725 	}
2726 	}
2727 	return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2728 }
2729 
2730 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2731 				   unsigned long arg)
2732 {
2733 	struct snd_pcm_file *pcm_file;
2734 
2735 	pcm_file = file->private_data;
2736 
2737 	if (((cmd >> 8) & 0xff) != 'A')
2738 		return -ENOTTY;
2739 
2740 	return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2741 				       (void __user *)arg);
2742 }
2743 
2744 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2745 				  unsigned long arg)
2746 {
2747 	struct snd_pcm_file *pcm_file;
2748 
2749 	pcm_file = file->private_data;
2750 
2751 	if (((cmd >> 8) & 0xff) != 'A')
2752 		return -ENOTTY;
2753 
2754 	return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2755 				      (void __user *)arg);
2756 }
2757 
2758 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2759 			 unsigned int cmd, void *arg)
2760 {
2761 	mm_segment_t fs;
2762 	int result;
2763 
2764 	fs = snd_enter_user();
2765 	switch (substream->stream) {
2766 	case SNDRV_PCM_STREAM_PLAYBACK:
2767 		result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2768 						 (void __user *)arg);
2769 		break;
2770 	case SNDRV_PCM_STREAM_CAPTURE:
2771 		result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2772 						(void __user *)arg);
2773 		break;
2774 	default:
2775 		result = -EINVAL;
2776 		break;
2777 	}
2778 	snd_leave_user(fs);
2779 	return result;
2780 }
2781 
2782 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2783 
2784 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2785 			    loff_t * offset)
2786 {
2787 	struct snd_pcm_file *pcm_file;
2788 	struct snd_pcm_substream *substream;
2789 	struct snd_pcm_runtime *runtime;
2790 	snd_pcm_sframes_t result;
2791 
2792 	pcm_file = file->private_data;
2793 	substream = pcm_file->substream;
2794 	if (PCM_RUNTIME_CHECK(substream))
2795 		return -ENXIO;
2796 	runtime = substream->runtime;
2797 	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2798 		return -EBADFD;
2799 	if (!frame_aligned(runtime, count))
2800 		return -EINVAL;
2801 	count = bytes_to_frames(runtime, count);
2802 	result = snd_pcm_lib_read(substream, buf, count);
2803 	if (result > 0)
2804 		result = frames_to_bytes(runtime, result);
2805 	return result;
2806 }
2807 
2808 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2809 			     size_t count, loff_t * offset)
2810 {
2811 	struct snd_pcm_file *pcm_file;
2812 	struct snd_pcm_substream *substream;
2813 	struct snd_pcm_runtime *runtime;
2814 	snd_pcm_sframes_t result;
2815 
2816 	pcm_file = file->private_data;
2817 	substream = pcm_file->substream;
2818 	if (PCM_RUNTIME_CHECK(substream))
2819 		return -ENXIO;
2820 	runtime = substream->runtime;
2821 	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2822 		return -EBADFD;
2823 	if (!frame_aligned(runtime, count))
2824 		return -EINVAL;
2825 	count = bytes_to_frames(runtime, count);
2826 	result = snd_pcm_lib_write(substream, buf, count);
2827 	if (result > 0)
2828 		result = frames_to_bytes(runtime, result);
2829 	return result;
2830 }
2831 
2832 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2833 			     unsigned long nr_segs, loff_t pos)
2834 
2835 {
2836 	struct snd_pcm_file *pcm_file;
2837 	struct snd_pcm_substream *substream;
2838 	struct snd_pcm_runtime *runtime;
2839 	snd_pcm_sframes_t result;
2840 	unsigned long i;
2841 	void __user **bufs;
2842 	snd_pcm_uframes_t frames;
2843 
2844 	pcm_file = iocb->ki_filp->private_data;
2845 	substream = pcm_file->substream;
2846 	if (PCM_RUNTIME_CHECK(substream))
2847 		return -ENXIO;
2848 	runtime = substream->runtime;
2849 	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2850 		return -EBADFD;
2851 	if (nr_segs > 1024 || nr_segs != runtime->channels)
2852 		return -EINVAL;
2853 	if (!frame_aligned(runtime, iov->iov_len))
2854 		return -EINVAL;
2855 	frames = bytes_to_samples(runtime, iov->iov_len);
2856 	bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2857 	if (bufs == NULL)
2858 		return -ENOMEM;
2859 	for (i = 0; i < nr_segs; ++i)
2860 		bufs[i] = iov[i].iov_base;
2861 	result = snd_pcm_lib_readv(substream, bufs, frames);
2862 	if (result > 0)
2863 		result = frames_to_bytes(runtime, result);
2864 	kfree(bufs);
2865 	return result;
2866 }
2867 
2868 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2869 			      unsigned long nr_segs, loff_t pos)
2870 {
2871 	struct snd_pcm_file *pcm_file;
2872 	struct snd_pcm_substream *substream;
2873 	struct snd_pcm_runtime *runtime;
2874 	snd_pcm_sframes_t result;
2875 	unsigned long i;
2876 	void __user **bufs;
2877 	snd_pcm_uframes_t frames;
2878 
2879 	pcm_file = iocb->ki_filp->private_data;
2880 	substream = pcm_file->substream;
2881 	if (PCM_RUNTIME_CHECK(substream))
2882 		return -ENXIO;
2883 	runtime = substream->runtime;
2884 	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2885 		return -EBADFD;
2886 	if (nr_segs > 128 || nr_segs != runtime->channels ||
2887 	    !frame_aligned(runtime, iov->iov_len))
2888 		return -EINVAL;
2889 	frames = bytes_to_samples(runtime, iov->iov_len);
2890 	bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2891 	if (bufs == NULL)
2892 		return -ENOMEM;
2893 	for (i = 0; i < nr_segs; ++i)
2894 		bufs[i] = iov[i].iov_base;
2895 	result = snd_pcm_lib_writev(substream, bufs, frames);
2896 	if (result > 0)
2897 		result = frames_to_bytes(runtime, result);
2898 	kfree(bufs);
2899 	return result;
2900 }
2901 
2902 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2903 {
2904 	struct snd_pcm_file *pcm_file;
2905 	struct snd_pcm_substream *substream;
2906 	struct snd_pcm_runtime *runtime;
2907         unsigned int mask;
2908 	snd_pcm_uframes_t avail;
2909 
2910 	pcm_file = file->private_data;
2911 
2912 	substream = pcm_file->substream;
2913 	if (PCM_RUNTIME_CHECK(substream))
2914 		return -ENXIO;
2915 	runtime = substream->runtime;
2916 
2917 	poll_wait(file, &runtime->sleep, wait);
2918 
2919 	snd_pcm_stream_lock_irq(substream);
2920 	avail = snd_pcm_playback_avail(runtime);
2921 	switch (runtime->status->state) {
2922 	case SNDRV_PCM_STATE_RUNNING:
2923 	case SNDRV_PCM_STATE_PREPARED:
2924 	case SNDRV_PCM_STATE_PAUSED:
2925 		if (avail >= runtime->control->avail_min) {
2926 			mask = POLLOUT | POLLWRNORM;
2927 			break;
2928 		}
2929 		/* Fall through */
2930 	case SNDRV_PCM_STATE_DRAINING:
2931 		mask = 0;
2932 		break;
2933 	default:
2934 		mask = POLLOUT | POLLWRNORM | POLLERR;
2935 		break;
2936 	}
2937 	snd_pcm_stream_unlock_irq(substream);
2938 	return mask;
2939 }
2940 
2941 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2942 {
2943 	struct snd_pcm_file *pcm_file;
2944 	struct snd_pcm_substream *substream;
2945 	struct snd_pcm_runtime *runtime;
2946         unsigned int mask;
2947 	snd_pcm_uframes_t avail;
2948 
2949 	pcm_file = file->private_data;
2950 
2951 	substream = pcm_file->substream;
2952 	if (PCM_RUNTIME_CHECK(substream))
2953 		return -ENXIO;
2954 	runtime = substream->runtime;
2955 
2956 	poll_wait(file, &runtime->sleep, wait);
2957 
2958 	snd_pcm_stream_lock_irq(substream);
2959 	avail = snd_pcm_capture_avail(runtime);
2960 	switch (runtime->status->state) {
2961 	case SNDRV_PCM_STATE_RUNNING:
2962 	case SNDRV_PCM_STATE_PREPARED:
2963 	case SNDRV_PCM_STATE_PAUSED:
2964 		if (avail >= runtime->control->avail_min) {
2965 			mask = POLLIN | POLLRDNORM;
2966 			break;
2967 		}
2968 		mask = 0;
2969 		break;
2970 	case SNDRV_PCM_STATE_DRAINING:
2971 		if (avail > 0) {
2972 			mask = POLLIN | POLLRDNORM;
2973 			break;
2974 		}
2975 		/* Fall through */
2976 	default:
2977 		mask = POLLIN | POLLRDNORM | POLLERR;
2978 		break;
2979 	}
2980 	snd_pcm_stream_unlock_irq(substream);
2981 	return mask;
2982 }
2983 
2984 /*
2985  * mmap support
2986  */
2987 
2988 /*
2989  * Only on coherent architectures, we can mmap the status and the control records
2990  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
2991  */
2992 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
2993 /*
2994  * mmap status record
2995  */
2996 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
2997 						struct vm_fault *vmf)
2998 {
2999 	struct snd_pcm_substream *substream = area->vm_private_data;
3000 	struct snd_pcm_runtime *runtime;
3001 
3002 	if (substream == NULL)
3003 		return VM_FAULT_SIGBUS;
3004 	runtime = substream->runtime;
3005 	vmf->page = virt_to_page(runtime->status);
3006 	get_page(vmf->page);
3007 	return 0;
3008 }
3009 
3010 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3011 {
3012 	.fault =	snd_pcm_mmap_status_fault,
3013 };
3014 
3015 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3016 			       struct vm_area_struct *area)
3017 {
3018 	struct snd_pcm_runtime *runtime;
3019 	long size;
3020 	if (!(area->vm_flags & VM_READ))
3021 		return -EINVAL;
3022 	runtime = substream->runtime;
3023 	size = area->vm_end - area->vm_start;
3024 	if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3025 		return -EINVAL;
3026 	area->vm_ops = &snd_pcm_vm_ops_status;
3027 	area->vm_private_data = substream;
3028 	area->vm_flags |= VM_RESERVED;
3029 	return 0;
3030 }
3031 
3032 /*
3033  * mmap control record
3034  */
3035 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3036 						struct vm_fault *vmf)
3037 {
3038 	struct snd_pcm_substream *substream = area->vm_private_data;
3039 	struct snd_pcm_runtime *runtime;
3040 
3041 	if (substream == NULL)
3042 		return VM_FAULT_SIGBUS;
3043 	runtime = substream->runtime;
3044 	vmf->page = virt_to_page(runtime->control);
3045 	get_page(vmf->page);
3046 	return 0;
3047 }
3048 
3049 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3050 {
3051 	.fault =	snd_pcm_mmap_control_fault,
3052 };
3053 
3054 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3055 				struct vm_area_struct *area)
3056 {
3057 	struct snd_pcm_runtime *runtime;
3058 	long size;
3059 	if (!(area->vm_flags & VM_READ))
3060 		return -EINVAL;
3061 	runtime = substream->runtime;
3062 	size = area->vm_end - area->vm_start;
3063 	if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3064 		return -EINVAL;
3065 	area->vm_ops = &snd_pcm_vm_ops_control;
3066 	area->vm_private_data = substream;
3067 	area->vm_flags |= VM_RESERVED;
3068 	return 0;
3069 }
3070 #else /* ! coherent mmap */
3071 /*
3072  * don't support mmap for status and control records.
3073  */
3074 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3075 			       struct vm_area_struct *area)
3076 {
3077 	return -ENXIO;
3078 }
3079 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3080 				struct vm_area_struct *area)
3081 {
3082 	return -ENXIO;
3083 }
3084 #endif /* coherent mmap */
3085 
3086 static inline struct page *
3087 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3088 {
3089 	void *vaddr = substream->runtime->dma_area + ofs;
3090 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3091 	if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3092 		return virt_to_page(CAC_ADDR(vaddr));
3093 #endif
3094 #if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
3095 	if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
3096 		dma_addr_t addr = substream->runtime->dma_addr + ofs;
3097 		addr -= get_dma_offset(substream->dma_buffer.dev.dev);
3098 		/* assume dma_handle set via pfn_to_phys() in
3099 		 * mm/dma-noncoherent.c
3100 		 */
3101 		return pfn_to_page(addr >> PAGE_SHIFT);
3102 	}
3103 #endif
3104 	return virt_to_page(vaddr);
3105 }
3106 
3107 /*
3108  * fault callback for mmapping a RAM page
3109  */
3110 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3111 						struct vm_fault *vmf)
3112 {
3113 	struct snd_pcm_substream *substream = area->vm_private_data;
3114 	struct snd_pcm_runtime *runtime;
3115 	unsigned long offset;
3116 	struct page * page;
3117 	size_t dma_bytes;
3118 
3119 	if (substream == NULL)
3120 		return VM_FAULT_SIGBUS;
3121 	runtime = substream->runtime;
3122 	offset = vmf->pgoff << PAGE_SHIFT;
3123 	dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3124 	if (offset > dma_bytes - PAGE_SIZE)
3125 		return VM_FAULT_SIGBUS;
3126 	if (substream->ops->page)
3127 		page = substream->ops->page(substream, offset);
3128 	else
3129 		page = snd_pcm_default_page_ops(substream, offset);
3130 	if (!page)
3131 		return VM_FAULT_SIGBUS;
3132 	get_page(page);
3133 	vmf->page = page;
3134 	return 0;
3135 }
3136 
3137 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3138 	.open =		snd_pcm_mmap_data_open,
3139 	.close =	snd_pcm_mmap_data_close,
3140 };
3141 
3142 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3143 	.open =		snd_pcm_mmap_data_open,
3144 	.close =	snd_pcm_mmap_data_close,
3145 	.fault =	snd_pcm_mmap_data_fault,
3146 };
3147 
3148 #ifndef ARCH_HAS_DMA_MMAP_COHERENT
3149 /* This should be defined / handled globally! */
3150 #ifdef CONFIG_ARM
3151 #define ARCH_HAS_DMA_MMAP_COHERENT
3152 #endif
3153 #endif
3154 
3155 /*
3156  * mmap the DMA buffer on RAM
3157  */
3158 static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
3159 				struct vm_area_struct *area)
3160 {
3161 	area->vm_flags |= VM_RESERVED;
3162 #ifdef ARCH_HAS_DMA_MMAP_COHERENT
3163 	if (!substream->ops->page &&
3164 	    substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3165 		return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3166 					 area,
3167 					 substream->runtime->dma_area,
3168 					 substream->runtime->dma_addr,
3169 					 area->vm_end - area->vm_start);
3170 #elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3171 	if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV &&
3172 	    !plat_device_is_coherent(substream->dma_buffer.dev.dev))
3173 		area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3174 #endif /* ARCH_HAS_DMA_MMAP_COHERENT */
3175 	/* mmap with fault handler */
3176 	area->vm_ops = &snd_pcm_vm_ops_data_fault;
3177 	return 0;
3178 }
3179 
3180 /*
3181  * mmap the DMA buffer on I/O memory area
3182  */
3183 #if SNDRV_PCM_INFO_MMAP_IOMEM
3184 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3185 			   struct vm_area_struct *area)
3186 {
3187 	long size;
3188 	unsigned long offset;
3189 
3190 	area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3191 	area->vm_flags |= VM_IO;
3192 	size = area->vm_end - area->vm_start;
3193 	offset = area->vm_pgoff << PAGE_SHIFT;
3194 	if (io_remap_pfn_range(area, area->vm_start,
3195 				(substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
3196 				size, area->vm_page_prot))
3197 		return -EAGAIN;
3198 	return 0;
3199 }
3200 
3201 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3202 #endif /* SNDRV_PCM_INFO_MMAP */
3203 
3204 /* mmap callback with pgprot_noncached */
3205 int snd_pcm_lib_mmap_noncached(struct snd_pcm_substream *substream,
3206 			       struct vm_area_struct *area)
3207 {
3208 	area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3209 	return snd_pcm_default_mmap(substream, area);
3210 }
3211 EXPORT_SYMBOL(snd_pcm_lib_mmap_noncached);
3212 
3213 /*
3214  * mmap DMA buffer
3215  */
3216 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3217 		      struct vm_area_struct *area)
3218 {
3219 	struct snd_pcm_runtime *runtime;
3220 	long size;
3221 	unsigned long offset;
3222 	size_t dma_bytes;
3223 	int err;
3224 
3225 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3226 		if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3227 			return -EINVAL;
3228 	} else {
3229 		if (!(area->vm_flags & VM_READ))
3230 			return -EINVAL;
3231 	}
3232 	runtime = substream->runtime;
3233 	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3234 		return -EBADFD;
3235 	if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3236 		return -ENXIO;
3237 	if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3238 	    runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3239 		return -EINVAL;
3240 	size = area->vm_end - area->vm_start;
3241 	offset = area->vm_pgoff << PAGE_SHIFT;
3242 	dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3243 	if ((size_t)size > dma_bytes)
3244 		return -EINVAL;
3245 	if (offset > dma_bytes - size)
3246 		return -EINVAL;
3247 
3248 	area->vm_ops = &snd_pcm_vm_ops_data;
3249 	area->vm_private_data = substream;
3250 	if (substream->ops->mmap)
3251 		err = substream->ops->mmap(substream, area);
3252 	else
3253 		err = snd_pcm_default_mmap(substream, area);
3254 	if (!err)
3255 		atomic_inc(&substream->mmap_count);
3256 	return err;
3257 }
3258 
3259 EXPORT_SYMBOL(snd_pcm_mmap_data);
3260 
3261 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3262 {
3263 	struct snd_pcm_file * pcm_file;
3264 	struct snd_pcm_substream *substream;
3265 	unsigned long offset;
3266 
3267 	pcm_file = file->private_data;
3268 	substream = pcm_file->substream;
3269 	if (PCM_RUNTIME_CHECK(substream))
3270 		return -ENXIO;
3271 
3272 	offset = area->vm_pgoff << PAGE_SHIFT;
3273 	switch (offset) {
3274 	case SNDRV_PCM_MMAP_OFFSET_STATUS:
3275 		if (pcm_file->no_compat_mmap)
3276 			return -ENXIO;
3277 		return snd_pcm_mmap_status(substream, file, area);
3278 	case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3279 		if (pcm_file->no_compat_mmap)
3280 			return -ENXIO;
3281 		return snd_pcm_mmap_control(substream, file, area);
3282 	default:
3283 		return snd_pcm_mmap_data(substream, file, area);
3284 	}
3285 	return 0;
3286 }
3287 
3288 static int snd_pcm_fasync(int fd, struct file * file, int on)
3289 {
3290 	struct snd_pcm_file * pcm_file;
3291 	struct snd_pcm_substream *substream;
3292 	struct snd_pcm_runtime *runtime;
3293 
3294 	pcm_file = file->private_data;
3295 	substream = pcm_file->substream;
3296 	if (PCM_RUNTIME_CHECK(substream))
3297 		return -ENXIO;
3298 	runtime = substream->runtime;
3299 	return fasync_helper(fd, file, on, &runtime->fasync);
3300 }
3301 
3302 /*
3303  * ioctl32 compat
3304  */
3305 #ifdef CONFIG_COMPAT
3306 #include "pcm_compat.c"
3307 #else
3308 #define snd_pcm_ioctl_compat	NULL
3309 #endif
3310 
3311 /*
3312  *  To be removed helpers to keep binary compatibility
3313  */
3314 
3315 #ifdef CONFIG_SND_SUPPORT_OLD_API
3316 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3317 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3318 
3319 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3320 					       struct snd_pcm_hw_params_old *oparams)
3321 {
3322 	unsigned int i;
3323 
3324 	memset(params, 0, sizeof(*params));
3325 	params->flags = oparams->flags;
3326 	for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3327 		params->masks[i].bits[0] = oparams->masks[i];
3328 	memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3329 	params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3330 	params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3331 	params->info = oparams->info;
3332 	params->msbits = oparams->msbits;
3333 	params->rate_num = oparams->rate_num;
3334 	params->rate_den = oparams->rate_den;
3335 	params->fifo_size = oparams->fifo_size;
3336 }
3337 
3338 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3339 					     struct snd_pcm_hw_params *params)
3340 {
3341 	unsigned int i;
3342 
3343 	memset(oparams, 0, sizeof(*oparams));
3344 	oparams->flags = params->flags;
3345 	for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3346 		oparams->masks[i] = params->masks[i].bits[0];
3347 	memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3348 	oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3349 	oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3350 	oparams->info = params->info;
3351 	oparams->msbits = params->msbits;
3352 	oparams->rate_num = params->rate_num;
3353 	oparams->rate_den = params->rate_den;
3354 	oparams->fifo_size = params->fifo_size;
3355 }
3356 
3357 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3358 				      struct snd_pcm_hw_params_old __user * _oparams)
3359 {
3360 	struct snd_pcm_hw_params *params;
3361 	struct snd_pcm_hw_params_old *oparams = NULL;
3362 	int err;
3363 
3364 	params = kmalloc(sizeof(*params), GFP_KERNEL);
3365 	if (!params)
3366 		return -ENOMEM;
3367 
3368 	oparams = memdup_user(_oparams, sizeof(*oparams));
3369 	if (IS_ERR(oparams)) {
3370 		err = PTR_ERR(oparams);
3371 		goto out;
3372 	}
3373 	snd_pcm_hw_convert_from_old_params(params, oparams);
3374 	err = snd_pcm_hw_refine(substream, params);
3375 	snd_pcm_hw_convert_to_old_params(oparams, params);
3376 	if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3377 		if (!err)
3378 			err = -EFAULT;
3379 	}
3380 
3381 	kfree(oparams);
3382 out:
3383 	kfree(params);
3384 	return err;
3385 }
3386 
3387 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3388 				      struct snd_pcm_hw_params_old __user * _oparams)
3389 {
3390 	struct snd_pcm_hw_params *params;
3391 	struct snd_pcm_hw_params_old *oparams = NULL;
3392 	int err;
3393 
3394 	params = kmalloc(sizeof(*params), GFP_KERNEL);
3395 	if (!params)
3396 		return -ENOMEM;
3397 
3398 	oparams = memdup_user(_oparams, sizeof(*oparams));
3399 	if (IS_ERR(oparams)) {
3400 		err = PTR_ERR(oparams);
3401 		goto out;
3402 	}
3403 	snd_pcm_hw_convert_from_old_params(params, oparams);
3404 	err = snd_pcm_hw_params(substream, params);
3405 	snd_pcm_hw_convert_to_old_params(oparams, params);
3406 	if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3407 		if (!err)
3408 			err = -EFAULT;
3409 	}
3410 
3411 	kfree(oparams);
3412 out:
3413 	kfree(params);
3414 	return err;
3415 }
3416 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3417 
3418 #ifndef CONFIG_MMU
3419 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3420 					       unsigned long addr,
3421 					       unsigned long len,
3422 					       unsigned long pgoff,
3423 					       unsigned long flags)
3424 {
3425 	struct snd_pcm_file *pcm_file = file->private_data;
3426 	struct snd_pcm_substream *substream = pcm_file->substream;
3427 	struct snd_pcm_runtime *runtime = substream->runtime;
3428 	unsigned long offset = pgoff << PAGE_SHIFT;
3429 
3430 	switch (offset) {
3431 	case SNDRV_PCM_MMAP_OFFSET_STATUS:
3432 		return (unsigned long)runtime->status;
3433 	case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3434 		return (unsigned long)runtime->control;
3435 	default:
3436 		return (unsigned long)runtime->dma_area + offset;
3437 	}
3438 }
3439 #else
3440 # define snd_pcm_get_unmapped_area NULL
3441 #endif
3442 
3443 /*
3444  *  Register section
3445  */
3446 
3447 const struct file_operations snd_pcm_f_ops[2] = {
3448 	{
3449 		.owner =		THIS_MODULE,
3450 		.write =		snd_pcm_write,
3451 		.aio_write =		snd_pcm_aio_write,
3452 		.open =			snd_pcm_playback_open,
3453 		.release =		snd_pcm_release,
3454 		.llseek =		no_llseek,
3455 		.poll =			snd_pcm_playback_poll,
3456 		.unlocked_ioctl =	snd_pcm_playback_ioctl,
3457 		.compat_ioctl = 	snd_pcm_ioctl_compat,
3458 		.mmap =			snd_pcm_mmap,
3459 		.fasync =		snd_pcm_fasync,
3460 		.get_unmapped_area =	snd_pcm_get_unmapped_area,
3461 	},
3462 	{
3463 		.owner =		THIS_MODULE,
3464 		.read =			snd_pcm_read,
3465 		.aio_read =		snd_pcm_aio_read,
3466 		.open =			snd_pcm_capture_open,
3467 		.release =		snd_pcm_release,
3468 		.llseek =		no_llseek,
3469 		.poll =			snd_pcm_capture_poll,
3470 		.unlocked_ioctl =	snd_pcm_capture_ioctl,
3471 		.compat_ioctl = 	snd_pcm_ioctl_compat,
3472 		.mmap =			snd_pcm_mmap,
3473 		.fasync =		snd_pcm_fasync,
3474 		.get_unmapped_area =	snd_pcm_get_unmapped_area,
3475 	}
3476 };
3477