pcm_native.c 105 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1 2
/*
 *  Digital Audio (PCM) abstract layer
3
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
Linus Torvalds's avatar
Linus Torvalds committed
4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
 *
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <linux/mm.h>
23
#include <linux/module.h>
Linus Torvalds's avatar
Linus Torvalds committed
24 25
#include <linux/file.h>
#include <linux/slab.h>
26
#include <linux/sched/signal.h>
Linus Torvalds's avatar
Linus Torvalds committed
27
#include <linux/time.h>
28
#include <linux/pm_qos.h>
29
#include <linux/io.h>
30
#include <linux/dma-mapping.h>
Linus Torvalds's avatar
Linus Torvalds committed
31 32 33 34 35 36 37
#include <sound/core.h>
#include <sound/control.h>
#include <sound/info.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/timer.h>
#include <sound/minors.h>
38
#include <linux/uio.h>
Linus Torvalds's avatar
Linus Torvalds committed
39

40 41
#include "pcm_local.h"

42
#ifdef CONFIG_SND_DEBUG
43 44
#define CREATE_TRACE_POINTS
#include "pcm_param_trace.h"
45 46 47 48 49 50
#else
#define trace_hw_mask_param_enabled()		0
#define trace_hw_interval_param_enabled()	0
#define trace_hw_mask_param(substream, type, index, prev, curr)
#define trace_hw_interval_param(substream, type, index, prev, curr)
#endif
51

Linus Torvalds's avatar
Linus Torvalds committed
52 53 54 55
/*
 *  Compatibility
 */

56
struct snd_pcm_hw_params_old {
Linus Torvalds's avatar
Linus Torvalds committed
57 58 59
	unsigned int flags;
	unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
			   SNDRV_PCM_HW_PARAM_ACCESS + 1];
60
	struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
Linus Torvalds's avatar
Linus Torvalds committed
61 62 63 64 65 66 67
					SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
	unsigned int rmask;
	unsigned int cmask;
	unsigned int info;
	unsigned int msbits;
	unsigned int rate_num;
	unsigned int rate_den;
68
	snd_pcm_uframes_t fifo_size;
Linus Torvalds's avatar
Linus Torvalds committed
69 70 71
	unsigned char reserved[64];
};

72
#ifdef CONFIG_SND_SUPPORT_OLD_API
73 74
#define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
#define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
Linus Torvalds's avatar
Linus Torvalds committed
75

76 77 78 79
static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
				      struct snd_pcm_hw_params_old __user * _oparams);
static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
				      struct snd_pcm_hw_params_old __user * _oparams);
80
#endif
81
static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
Linus Torvalds's avatar
Linus Torvalds committed
82 83 84 85 86

/*
 *
 */

87 88
static DEFINE_RWLOCK(snd_pcm_link_rwlock);
static DECLARE_RWSEM(snd_pcm_link_rwsem);
Linus Torvalds's avatar
Linus Torvalds committed
89

90 91 92 93 94 95 96 97 98 99 100 101
/* Writer in rwsem may block readers even during its waiting in queue,
 * and this may lead to a deadlock when the code path takes read sem
 * twice (e.g. one in snd_pcm_action_nonatomic() and another in
 * snd_pcm_stream_lock()).  As a (suboptimal) workaround, let writer to
 * spin until it gets the lock.
 */
static inline void down_write_nonblock(struct rw_semaphore *lock)
{
	while (!down_write_trylock(lock))
		cond_resched();
}

102 103 104 105 106 107 108 109
/**
 * snd_pcm_stream_lock - Lock the PCM stream
 * @substream: PCM substream
 *
 * This locks the PCM stream's spinlock or mutex depending on the nonatomic
 * flag of the given substream.  This also takes the global link rw lock
 * (or rw sem), too, for avoiding the race with linked streams.
 */
110 111 112
void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
{
	if (substream->pcm->nonatomic) {
113
		down_read_nested(&snd_pcm_link_rwsem, SINGLE_DEPTH_NESTING);
114 115 116 117 118 119 120 121
		mutex_lock(&substream->self_group.mutex);
	} else {
		read_lock(&snd_pcm_link_rwlock);
		spin_lock(&substream->self_group.lock);
	}
}
EXPORT_SYMBOL_GPL(snd_pcm_stream_lock);

122 123 124 125 126 127
/**
 * snd_pcm_stream_lock - Unlock the PCM stream
 * @substream: PCM substream
 *
 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock().
 */
128 129 130 131 132 133 134 135 136 137 138 139
void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
{
	if (substream->pcm->nonatomic) {
		mutex_unlock(&substream->self_group.mutex);
		up_read(&snd_pcm_link_rwsem);
	} else {
		spin_unlock(&substream->self_group.lock);
		read_unlock(&snd_pcm_link_rwlock);
	}
}
EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock);

140 141 142 143 144 145 146 147
/**
 * snd_pcm_stream_lock_irq - Lock the PCM stream
 * @substream: PCM substream
 *
 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local
 * IRQ (only when nonatomic is false).  In nonatomic case, this is identical
 * as snd_pcm_stream_lock().
 */
148 149 150 151 152 153 154 155
void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
{
	if (!substream->pcm->nonatomic)
		local_irq_disable();
	snd_pcm_stream_lock(substream);
}
EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);

156 157 158 159 160 161
/**
 * snd_pcm_stream_unlock_irq - Unlock the PCM stream
 * @substream: PCM substream
 *
 * This is a counter-part of snd_pcm_stream_lock_irq().
 */
162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179
void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
{
	snd_pcm_stream_unlock(substream);
	if (!substream->pcm->nonatomic)
		local_irq_enable();
}
EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq);

unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream)
{
	unsigned long flags = 0;
	if (!substream->pcm->nonatomic)
		local_irq_save(flags);
	snd_pcm_stream_lock(substream);
	return flags;
}
EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave);

180 181 182 183 184 185 186
/**
 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream
 * @substream: PCM substream
 * @flags: irq flags
 *
 * This is a counter-part of snd_pcm_stream_lock_irqsave().
 */
187 188 189 190 191 192 193 194
void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
				      unsigned long flags)
{
	snd_pcm_stream_unlock(substream);
	if (!substream->pcm->nonatomic)
		local_irq_restore(flags);
}
EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
Linus Torvalds's avatar
Linus Torvalds committed
195

196
int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
Linus Torvalds's avatar
Linus Torvalds committed
197
{
198 199 200
	struct snd_pcm_runtime *runtime;
	struct snd_pcm *pcm = substream->pcm;
	struct snd_pcm_str *pstr = substream->pstr;
Linus Torvalds's avatar
Linus Torvalds committed
201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222

	memset(info, 0, sizeof(*info));
	info->card = pcm->card->number;
	info->device = pcm->device;
	info->stream = substream->stream;
	info->subdevice = substream->number;
	strlcpy(info->id, pcm->id, sizeof(info->id));
	strlcpy(info->name, pcm->name, sizeof(info->name));
	info->dev_class = pcm->dev_class;
	info->dev_subclass = pcm->dev_subclass;
	info->subdevices_count = pstr->substream_count;
	info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
	strlcpy(info->subname, substream->name, sizeof(info->subname));
	runtime = substream->runtime;
	/* AB: FIXME!!! This is definitely nonsense */
	if (runtime) {
		info->sync = runtime->sync;
		substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
	}
	return 0;
}

223 224
int snd_pcm_info_user(struct snd_pcm_substream *substream,
		      struct snd_pcm_info __user * _info)
Linus Torvalds's avatar
Linus Torvalds committed
225
{
226
	struct snd_pcm_info *info;
Linus Torvalds's avatar
Linus Torvalds committed
227 228 229 230 231 232 233 234 235 236 237 238 239 240
	int err;

	info = kmalloc(sizeof(*info), GFP_KERNEL);
	if (! info)
		return -ENOMEM;
	err = snd_pcm_info(substream, info);
	if (err >= 0) {
		if (copy_to_user(_info, info, sizeof(*info)))
			err = -EFAULT;
	}
	kfree(info);
	return err;
}

241 242 243 244 245 246 247 248 249 250 251 252 253 254 255
static bool hw_support_mmap(struct snd_pcm_substream *substream)
{
	if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
		return false;
	/* check architectures that return -EINVAL from dma_mmap_coherent() */
	/* FIXME: this should be some global flag */
#if defined(CONFIG_C6X) || defined(CONFIG_FRV) || defined(CONFIG_MN10300) ||\
	defined(CONFIG_PARISC) || defined(CONFIG_XTENSA)
	if (!substream->ops->mmap &&
	    substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
		return false;
#endif
	return true;
}

256 257 258 259 260 261 262 263 264 265 266 267 268 269
static int constrain_mask_params(struct snd_pcm_substream *substream,
				 struct snd_pcm_hw_params *params)
{
	struct snd_pcm_hw_constraints *constrs =
					&substream->runtime->hw_constraints;
	struct snd_mask *m;
	unsigned int k;
	struct snd_mask old_mask;
	int changed;

	for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
		m = hw_param_mask(params, k);
		if (snd_mask_empty(m))
			return -EINVAL;
270 271

		/* This parameter is not requested to change by a caller. */
272 273 274 275 276 277 278
		if (!(params->rmask & (1 << k)))
			continue;

		if (trace_hw_mask_param_enabled())
			old_mask = *m;

		changed = snd_mask_refine(m, constrs_mask(constrs, k));
279 280
		if (changed < 0)
			return changed;
281 282
		if (changed == 0)
			continue;
283

284
		/* Set corresponding flag so that the caller gets it. */
285 286
		trace_hw_mask_param(substream, k, 0, &old_mask, m);
		params->cmask |= 1 << k;
287 288 289 290 291
	}

	return 0;
}

292 293 294 295 296 297 298 299 300 301 302 303 304 305
static int constrain_interval_params(struct snd_pcm_substream *substream,
				     struct snd_pcm_hw_params *params)
{
	struct snd_pcm_hw_constraints *constrs =
					&substream->runtime->hw_constraints;
	struct snd_interval *i;
	unsigned int k;
	struct snd_interval old_interval;
	int changed;

	for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
		i = hw_param_interval(params, k);
		if (snd_interval_empty(i))
			return -EINVAL;
306 307

		/* This parameter is not requested to change by a caller. */
308 309 310 311 312 313 314
		if (!(params->rmask & (1 << k)))
			continue;

		if (trace_hw_interval_param_enabled())
			old_interval = *i;

		changed = snd_interval_refine(i, constrs_interval(constrs, k));
315 316
		if (changed < 0)
			return changed;
317 318
		if (changed == 0)
			continue;
319

320
		/* Set corresponding flag so that the caller gets it. */
321 322
		trace_hw_interval_param(substream, k, 0, &old_interval, i);
		params->cmask |= 1 << k;
323 324 325 326 327
	}

	return 0;
}

328 329
static int constrain_params_by_rules(struct snd_pcm_substream *substream,
				     struct snd_pcm_hw_params *params)
Linus Torvalds's avatar
Linus Torvalds committed
330
{
331 332
	struct snd_pcm_hw_constraints *constrs =
					&substream->runtime->hw_constraints;
Linus Torvalds's avatar
Linus Torvalds committed
333 334 335
	unsigned int k;
	unsigned int rstamps[constrs->rules_num];
	unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
336
	unsigned int stamp;
337 338
	struct snd_pcm_hw_rule *r;
	unsigned int d;
339 340
	struct snd_mask old_mask;
	struct snd_interval old_interval;
341
	bool again;
342
	int changed;
Linus Torvalds's avatar
Linus Torvalds committed
343

344 345 346 347 348 349
	/*
	 * Each application of rule has own sequence number.
	 *
	 * Each member of 'rstamps' array represents the sequence number of
	 * recent application of corresponding rule.
	 */
Linus Torvalds's avatar
Linus Torvalds committed
350 351
	for (k = 0; k < constrs->rules_num; k++)
		rstamps[k] = 0;
352 353 354 355 356 357 358 359 360 361

	/*
	 * Each member of 'vstamps' array represents the sequence number of
	 * recent application of rule in which corresponding parameters were
	 * changed.
	 *
	 * In initial state, elements corresponding to parameters requested by
	 * a caller is 1. For unrequested parameters, corresponding members
	 * have 0 so that the parameters are never changed anymore.
	 */
362
	for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
Linus Torvalds's avatar
Linus Torvalds committed
363
		vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
364 365 366

	/* Due to the above design, actual sequence number starts at 2. */
	stamp = 2;
367
retry:
368
	/* Apply all rules in order. */
369
	again = false;
370
	for (k = 0; k < constrs->rules_num; k++) {
371
		r = &constrs->rules[k];
372 373 374 375 376 377 378

		/*
		 * Check condition bits of this rule. When the rule has
		 * some condition bits, parameter without the bits is
		 * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP
		 * is an example of the condition bits.
		 */
379 380
		if (r->cond && !(r->cond & params->flags))
			continue;
381 382 383 384 385 386 387 388 389 390 391

		/*
		 * The 'deps' array includes maximum three dependencies
		 * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fourth
		 * member of this array is a sentinel and should be
		 * negative value.
		 *
		 * This rule should be processed in this time when dependent
		 * parameters were changed at former applications of the other
		 * rules.
		 */
392
		for (d = 0; r->deps[d] >= 0; d++) {
393
			if (vstamps[r->deps[d]] > rstamps[k])
394 395
				break;
		}
396
		if (r->deps[d] < 0)
397
			continue;
398

399 400 401 402 403 404 405 406
		if (trace_hw_mask_param_enabled()) {
			if (hw_is_mask(r->var))
				old_mask = *hw_param_mask(params, r->var);
		}
		if (trace_hw_interval_param_enabled()) {
			if (hw_is_interval(r->var))
				old_interval = *hw_param_interval(params, r->var);
		}
407

408
		changed = r->func(params, r);
409 410
		if (changed < 0)
			return changed;
411

412
		/*
413
		 * When the parameter is changed, notify it to the caller
414 415 416
		 * by corresponding returned bit, then preparing for next
		 * iteration.
		 */
417
		if (changed && r->var >= 0) {
418 419 420 421 422 423 424 425 426 427 428
			if (hw_is_mask(r->var)) {
				trace_hw_mask_param(substream, r->var,
					k + 1, &old_mask,
					hw_param_mask(params, r->var));
			}
			if (hw_is_interval(r->var)) {
				trace_hw_interval_param(substream, r->var,
					k + 1, &old_interval,
					hw_param_interval(params, r->var));
			}

429 430
			params->cmask |= (1 << r->var);
			vstamps[r->var] = stamp;
431
			again = true;
Linus Torvalds's avatar
Linus Torvalds committed
432
		}
433

434
		rstamps[k] = stamp++;
435 436
	}

437
	/* Iterate to evaluate all rules till no parameters are changed. */
438 439
	if (again)
		goto retry;
440 441 442 443

	return 0;
}

444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475
static int fixup_unreferenced_params(struct snd_pcm_substream *substream,
				     struct snd_pcm_hw_params *params)
{
	const struct snd_interval *i;
	const struct snd_mask *m;
	int err;

	if (!params->msbits) {
		i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
		if (snd_interval_single(i))
			params->msbits = snd_interval_value(i);
	}

	if (!params->rate_den) {
		i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
		if (snd_interval_single(i)) {
			params->rate_num = snd_interval_value(i);
			params->rate_den = 1;
		}
	}

	if (!params->fifo_size) {
		m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
		i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
		if (snd_mask_single(m) && snd_interval_single(i)) {
			err = substream->ops->ioctl(substream,
					SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
			if (err < 0)
				return err;
		}
	}

476 477 478 479 480 481 482 483 484
	if (!params->info) {
		params->info = substream->runtime->hw.info;
		params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES |
				  SNDRV_PCM_INFO_DRAIN_TRIGGER);
		if (!hw_support_mmap(substream))
			params->info &= ~(SNDRV_PCM_INFO_MMAP |
					  SNDRV_PCM_INFO_MMAP_VALID);
	}

485 486 487
	return 0;
}

488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513
int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
		      struct snd_pcm_hw_params *params)
{
	int err;

	params->info = 0;
	params->fifo_size = 0;
	if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
		params->msbits = 0;
	if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
		params->rate_num = 0;
		params->rate_den = 0;
	}

	err = constrain_mask_params(substream, params);
	if (err < 0)
		return err;

	err = constrain_interval_params(substream, params);
	if (err < 0)
		return err;

	err = constrain_params_by_rules(substream, params);
	if (err < 0)
		return err;

Linus Torvalds's avatar
Linus Torvalds committed
514
	params->rmask = 0;
515

Linus Torvalds's avatar
Linus Torvalds committed
516 517
	return 0;
}
518 519
EXPORT_SYMBOL(snd_pcm_hw_refine);

520 521
static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
				  struct snd_pcm_hw_params __user * _params)
Linus Torvalds's avatar
Linus Torvalds committed
522
{
523
	struct snd_pcm_hw_params *params;
Linus Torvalds's avatar
Linus Torvalds committed
524 525
	int err;

526 527 528 529
	params = memdup_user(_params, sizeof(*params));
	if (IS_ERR(params))
		return PTR_ERR(params);

Linus Torvalds's avatar
Linus Torvalds committed
530
	err = snd_pcm_hw_refine(substream, params);
531 532
	if (err < 0)
		goto end;
533

534 535 536 537 538 539 540
	err = fixup_unreferenced_params(substream, params);
	if (err < 0)
		goto end;

	if (copy_to_user(_params, params, sizeof(*params)))
		err = -EFAULT;
end:
Linus Torvalds's avatar
Linus Torvalds committed
541 542 543 544
	kfree(params);
	return err;
}

545 546 547 548 549 550 551 552 553 554 555 556 557 558 559
static int period_to_usecs(struct snd_pcm_runtime *runtime)
{
	int usecs;

	if (! runtime->rate)
		return -1; /* invalid */

	/* take 75% of period time as the deadline */
	usecs = (750000 / runtime->rate) * runtime->period_size;
	usecs += ((750000 % runtime->rate) * runtime->period_size) /
		runtime->rate;

	return usecs;
}

560 561 562 563 564 565 566 567
static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state)
{
	snd_pcm_stream_lock_irq(substream);
	if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
		substream->runtime->status->state = state;
	snd_pcm_stream_unlock_irq(substream);
}

568 569 570 571 572 573 574 575 576 577
static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream,
					int event)
{
#ifdef CONFIG_SND_PCM_TIMER
	if (substream->timer)
		snd_timer_notify(substream->timer, event,
					&substream->runtime->trigger_tstamp);
#endif
}

578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604
/**
 * snd_pcm_hw_param_choose - choose a configuration defined by @params
 * @pcm: PCM instance
 * @params: the hw_params instance
 *
 * Choose one configuration from configuration space defined by @params.
 * The configuration chosen is that obtained fixing in this order:
 * first access, first format, first subformat, min channels,
 * min rate, min period time, max buffer size, min tick time
 *
 * Return: Zero if successful, or a negative error code on failure.
 */
static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
				    struct snd_pcm_hw_params *params)
{
	static const int vars[] = {
		SNDRV_PCM_HW_PARAM_ACCESS,
		SNDRV_PCM_HW_PARAM_FORMAT,
		SNDRV_PCM_HW_PARAM_SUBFORMAT,
		SNDRV_PCM_HW_PARAM_CHANNELS,
		SNDRV_PCM_HW_PARAM_RATE,
		SNDRV_PCM_HW_PARAM_PERIOD_TIME,
		SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
		SNDRV_PCM_HW_PARAM_TICK_TIME,
		-1
	};
	const int *v;
605 606
	struct snd_mask old_mask;
	struct snd_interval old_interval;
607
	int changed;
608 609

	for (v = vars; *v != -1; v++) {
610 611 612 613 614 615 616 617 618
		/* Keep old parameter to trace. */
		if (trace_hw_mask_param_enabled()) {
			if (hw_is_mask(*v))
				old_mask = *hw_param_mask(params, *v);
		}
		if (trace_hw_interval_param_enabled()) {
			if (hw_is_interval(*v))
				old_interval = *hw_param_interval(params, *v);
		}
619
		if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
620
			changed = snd_pcm_hw_param_first(pcm, params, *v, NULL);
621
		else
622 623 624 625 626
			changed = snd_pcm_hw_param_last(pcm, params, *v, NULL);
		if (snd_BUG_ON(changed < 0))
			return changed;
		if (changed == 0)
			continue;
627

628
		/* Trace the changed parameter. */
629 630 631 632 633 634 635 636
		if (hw_is_mask(*v)) {
			trace_hw_mask_param(pcm, *v, 0, &old_mask,
					    hw_param_mask(params, *v));
		}
		if (hw_is_interval(*v)) {
			trace_hw_interval_param(pcm, *v, 0, &old_interval,
						hw_param_interval(params, *v));
		}
637
	}
638

639 640 641
	return 0;
}

642 643
static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
			     struct snd_pcm_hw_params *params)
Linus Torvalds's avatar
Linus Torvalds committed
644
{
645
	struct snd_pcm_runtime *runtime;
646
	int err, usecs;
Linus Torvalds's avatar
Linus Torvalds committed
647 648 649
	unsigned int bits;
	snd_pcm_uframes_t frames;

650 651
	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
Linus Torvalds's avatar
Linus Torvalds committed
652 653 654 655 656 657 658 659 660 661 662 663
	runtime = substream->runtime;
	snd_pcm_stream_lock_irq(substream);
	switch (runtime->status->state) {
	case SNDRV_PCM_STATE_OPEN:
	case SNDRV_PCM_STATE_SETUP:
	case SNDRV_PCM_STATE_PREPARED:
		break;
	default:
		snd_pcm_stream_unlock_irq(substream);
		return -EBADFD;
	}
	snd_pcm_stream_unlock_irq(substream);
664
#if IS_ENABLED(CONFIG_SND_PCM_OSS)
Linus Torvalds's avatar
Linus Torvalds committed
665 666
	if (!substream->oss.oss)
#endif
667
		if (atomic_read(&substream->mmap_count))
Linus Torvalds's avatar
Linus Torvalds committed
668 669 670 671 672 673 674 675 676 677 678
			return -EBADFD;

	params->rmask = ~0U;
	err = snd_pcm_hw_refine(substream, params);
	if (err < 0)
		goto _error;

	err = snd_pcm_hw_params_choose(substream, params);
	if (err < 0)
		goto _error;

679 680 681 682
	err = fixup_unreferenced_params(substream, params);
	if (err < 0)
		goto _error;

Linus Torvalds's avatar
Linus Torvalds committed
683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699
	if (substream->ops->hw_params != NULL) {
		err = substream->ops->hw_params(substream, params);
		if (err < 0)
			goto _error;
	}

	runtime->access = params_access(params);
	runtime->format = params_format(params);
	runtime->subformat = params_subformat(params);
	runtime->channels = params_channels(params);
	runtime->rate = params_rate(params);
	runtime->period_size = params_period_size(params);
	runtime->periods = params_periods(params);
	runtime->buffer_size = params_buffer_size(params);
	runtime->info = params->info;
	runtime->rate_num = params->rate_num;
	runtime->rate_den = params->rate_den;
700 701 702
	runtime->no_period_wakeup =
			(params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
			(params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
Linus Torvalds's avatar
Linus Torvalds committed
703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723

	bits = snd_pcm_format_physical_width(runtime->format);
	runtime->sample_bits = bits;
	bits *= runtime->channels;
	runtime->frame_bits = bits;
	frames = 1;
	while (bits % 8 != 0) {
		bits *= 2;
		frames *= 2;
	}
	runtime->byte_align = bits / 8;
	runtime->min_align = frames;

	/* Default sw params */
	runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
	runtime->period_step = 1;
	runtime->control->avail_min = runtime->period_size;
	runtime->start_threshold = 1;
	runtime->stop_threshold = runtime->buffer_size;
	runtime->silence_threshold = 0;
	runtime->silence_size = 0;
724 725 726
	runtime->boundary = runtime->buffer_size;
	while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
		runtime->boundary *= 2;
Linus Torvalds's avatar
Linus Torvalds committed
727 728

	snd_pcm_timer_resolution_change(substream);
729
	snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
730

731 732
	if (pm_qos_request_active(&substream->latency_pm_qos_req))
		pm_qos_remove_request(&substream->latency_pm_qos_req);
733
	if ((usecs = period_to_usecs(runtime)) >= 0)
734 735
		pm_qos_add_request(&substream->latency_pm_qos_req,
				   PM_QOS_CPU_DMA_LATENCY, usecs);
Linus Torvalds's avatar
Linus Torvalds committed
736 737
	return 0;
 _error:
Lucas De Marchi's avatar
Lucas De Marchi committed
738
	/* hardware might be unusable from this time,
Linus Torvalds's avatar
Linus Torvalds committed
739 740
	   so we force application to retry to set
	   the correct hardware parameter settings */
741
	snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
Linus Torvalds's avatar
Linus Torvalds committed
742 743 744 745 746
	if (substream->ops->hw_free != NULL)
		substream->ops->hw_free(substream);
	return err;
}

747 748
static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
				  struct snd_pcm_hw_params __user * _params)
Linus Torvalds's avatar
Linus Torvalds committed
749
{
750
	struct snd_pcm_hw_params *params;
Linus Torvalds's avatar
Linus Torvalds committed
751 752
	int err;

753 754 755 756
	params = memdup_user(_params, sizeof(*params));
	if (IS_ERR(params))
		return PTR_ERR(params);

Linus Torvalds's avatar
Linus Torvalds committed
757
	err = snd_pcm_hw_params(substream, params);
758 759
	if (err < 0)
		goto end;
760

761 762 763
	if (copy_to_user(_params, params, sizeof(*params)))
		err = -EFAULT;
end:
Linus Torvalds's avatar
Linus Torvalds committed
764 765 766 767
	kfree(params);
	return err;
}

768
static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
Linus Torvalds's avatar
Linus Torvalds committed
769
{
770
	struct snd_pcm_runtime *runtime;
Linus Torvalds's avatar
Linus Torvalds committed
771 772
	int result = 0;

773 774
	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
Linus Torvalds's avatar
Linus Torvalds committed
775 776 777 778 779 780 781 782 783 784 785
	runtime = substream->runtime;
	snd_pcm_stream_lock_irq(substream);
	switch (runtime->status->state) {
	case SNDRV_PCM_STATE_SETUP:
	case SNDRV_PCM_STATE_PREPARED:
		break;
	default:
		snd_pcm_stream_unlock_irq(substream);
		return -EBADFD;
	}
	snd_pcm_stream_unlock_irq(substream);
786
	if (atomic_read(&substream->mmap_count))
Linus Torvalds's avatar
Linus Torvalds committed
787 788 789
		return -EBADFD;
	if (substream->ops->hw_free)
		result = substream->ops->hw_free(substream);
790
	snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
791
	pm_qos_remove_request(&substream->latency_pm_qos_req);
Linus Torvalds's avatar
Linus Torvalds committed
792 793 794
	return result;
}

795 796
static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
			     struct snd_pcm_sw_params *params)
Linus Torvalds's avatar
Linus Torvalds committed
797
{
798
	struct snd_pcm_runtime *runtime;
799
	int err;
Linus Torvalds's avatar
Linus Torvalds committed
800

801 802
	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
Linus Torvalds's avatar
Linus Torvalds committed
803 804 805 806 807 808 809 810
	runtime = substream->runtime;
	snd_pcm_stream_lock_irq(substream);
	if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
		snd_pcm_stream_unlock_irq(substream);
		return -EBADFD;
	}
	snd_pcm_stream_unlock_irq(substream);

811 812
	if (params->tstamp_mode < 0 ||
	    params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
Linus Torvalds's avatar
Linus Torvalds committed
813
		return -EINVAL;
814 815
	if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
	    params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
816
		return -EINVAL;
Linus Torvalds's avatar
Linus Torvalds committed
817 818 819 820 821 822 823 824 825 826 827
	if (params->avail_min == 0)
		return -EINVAL;
	if (params->silence_size >= runtime->boundary) {
		if (params->silence_threshold != 0)
			return -EINVAL;
	} else {
		if (params->silence_size > params->silence_threshold)
			return -EINVAL;
		if (params->silence_threshold > runtime->buffer_size)
			return -EINVAL;
	}
828
	err = 0;
Linus Torvalds's avatar
Linus Torvalds committed
829 830
	snd_pcm_stream_lock_irq(substream);
	runtime->tstamp_mode = params->tstamp_mode;
831 832
	if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
		runtime->tstamp_type = params->tstamp_type;
Linus Torvalds's avatar
Linus Torvalds committed
833 834 835 836 837 838 839 840 841 842 843
	runtime->period_step = params->period_step;
	runtime->control->avail_min = params->avail_min;
	runtime->start_threshold = params->start_threshold;
	runtime->stop_threshold = params->stop_threshold;
	runtime->silence_threshold = params->silence_threshold;
	runtime->silence_size = params->silence_size;
        params->boundary = runtime->boundary;
	if (snd_pcm_running(substream)) {
		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
		    runtime->silence_size > 0)
			snd_pcm_playback_silence(substream, ULONG_MAX);
844
		err = snd_pcm_update_state(substream, runtime);
Linus Torvalds's avatar
Linus Torvalds committed
845 846
	}
	snd_pcm_stream_unlock_irq(substream);
847
	return err;
Linus Torvalds's avatar
Linus Torvalds committed
848 849
}

850 851
static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
				  struct snd_pcm_sw_params __user * _params)
Linus Torvalds's avatar
Linus Torvalds committed
852
{
853
	struct snd_pcm_sw_params params;
Linus Torvalds's avatar
Linus Torvalds committed
854 855 856 857 858 859 860 861 862
	int err;
	if (copy_from_user(&params, _params, sizeof(params)))
		return -EFAULT;
	err = snd_pcm_sw_params(substream, &params);
	if (copy_to_user(_params, &params, sizeof(params)))
		return -EFAULT;
	return err;
}

863 864
int snd_pcm_status(struct snd_pcm_substream *substream,
		   struct snd_pcm_status *status)
Linus Torvalds's avatar
Linus Torvalds committed
865
{
866
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
867 868

	snd_pcm_stream_lock_irq(substream);
869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885

	snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data,
					&runtime->audio_tstamp_config);

	/* backwards compatible behavior */
	if (runtime->audio_tstamp_config.type_requested ==
		SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) {
		if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)
			runtime->audio_tstamp_config.type_requested =
				SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK;
		else
			runtime->audio_tstamp_config.type_requested =
				SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT;
		runtime->audio_tstamp_report.valid = 0;
	} else
		runtime->audio_tstamp_report.valid = 1;

Linus Torvalds's avatar
Linus Torvalds committed
886 887 888 889 890
	status->state = runtime->status->state;
	status->suspended_state = runtime->status->suspended_state;
	if (status->state == SNDRV_PCM_STATE_OPEN)
		goto _end;
	status->trigger_tstamp = runtime->trigger_tstamp;
891
	if (snd_pcm_running(substream)) {
Linus Torvalds's avatar
Linus Torvalds committed
892
		snd_pcm_update_hw_ptr(substream);
893 894
		if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
			status->tstamp = runtime->status->tstamp;
895
			status->driver_tstamp = runtime->driver_tstamp;
896 897
			status->audio_tstamp =
				runtime->status->audio_tstamp;
898 899 900 901 902 903
			if (runtime->audio_tstamp_report.valid == 1)
				/* backwards compatibility, no report provided in COMPAT mode */
				snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data,
								&status->audio_tstamp_accuracy,
								&runtime->audio_tstamp_report);

904 905
			goto _tstamp_end;
		}
906 907 908 909
	} else {
		/* get tstamp only in fallback mode and only if enabled */
		if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
			snd_pcm_gettime(runtime, &status->tstamp);
910 911
	}
 _tstamp_end:
Linus Torvalds's avatar
Linus Torvalds committed
912 913 914 915 916
	status->appl_ptr = runtime->control->appl_ptr;
	status->hw_ptr = runtime->status->hw_ptr;
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		status->avail = snd_pcm_playback_avail(runtime);
		if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
917
		    runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
Linus Torvalds's avatar
Linus Torvalds committed
918
			status->delay = runtime->buffer_size - status->avail;
919 920
			status->delay += runtime->delay;
		} else
Linus Torvalds's avatar
Linus Torvalds committed
921 922 923 924
			status->delay = 0;
	} else {
		status->avail = snd_pcm_capture_avail(runtime);
		if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
925
			status->delay = status->avail + runtime->delay;
Linus Torvalds's avatar
Linus Torvalds committed
926 927 928 929 930 931 932 933 934 935 936 937
		else
			status->delay = 0;
	}
	status->avail_max = runtime->avail_max;
	status->overrange = runtime->overrange;
	runtime->avail_max = 0;
	runtime->overrange = 0;
 _end:
 	snd_pcm_stream_unlock_irq(substream);
	return 0;
}

938
static int snd_pcm_status_user(struct snd_pcm_substream *substream,
939 940
			       struct snd_pcm_status __user * _status,
			       bool ext)
Linus Torvalds's avatar
Linus Torvalds committed
941
{
942
	struct snd_pcm_status status;
Linus Torvalds's avatar
Linus Torvalds committed
943
	int res;
944

Linus Torvalds's avatar
Linus Torvalds committed
945
	memset(&status, 0, sizeof(status));
946 947 948 949 950 951 952 953
	/*
	 * with extension, parameters are read/write,
	 * get audio_tstamp_data from user,
	 * ignore rest of status structure
	 */
	if (ext && get_user(status.audio_tstamp_data,
				(u32 __user *)(&_status->audio_tstamp_data)))
		return -EFAULT;
Linus Torvalds's avatar
Linus Torvalds committed
954 955 956 957 958 959 960 961
	res = snd_pcm_status(substream, &status);
	if (res < 0)
		return res;
	if (copy_to_user(_status, &status, sizeof(status)))
		return -EFAULT;
	return 0;
}

962 963
static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
				struct snd_pcm_channel_info * info)
Linus Torvalds's avatar
Linus Torvalds committed
964
{
965
	struct snd_pcm_runtime *runtime;
Linus Torvalds's avatar
Linus Torvalds committed
966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982
	unsigned int channel;
	
	channel = info->channel;
	runtime = substream->runtime;
	snd_pcm_stream_lock_irq(substream);
	if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
		snd_pcm_stream_unlock_irq(substream);
		return -EBADFD;
	}
	snd_pcm_stream_unlock_irq(substream);
	if (channel >= runtime->channels)
		return -EINVAL;
	memset(info, 0, sizeof(*info));
	info->channel = channel;
	return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
}

983 984
static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
				     struct snd_pcm_channel_info __user * _info)
Linus Torvalds's avatar
Linus Torvalds committed
985
{
986
	struct snd_pcm_channel_info info;
Linus Torvalds's avatar
Linus Torvalds committed
987 988 989 990 991 992 993 994 995 996 997 998
	int res;
	
	if (copy_from_user(&info, _info, sizeof(info)))
		return -EFAULT;
	res = snd_pcm_channel_info(substream, &info);
	if (res < 0)
		return res;
	if (copy_to_user(_info, &info, sizeof(info)))
		return -EFAULT;
	return 0;
}

999
static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
Linus Torvalds's avatar
Linus Torvalds committed
1000
{
1001
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
1002 1003 1004
	if (runtime->trigger_master == NULL)
		return;
	if (runtime->trigger_master == substream) {
1005 1006
		if (!runtime->trigger_tstamp_latched)
			snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
Linus Torvalds's avatar
Linus Torvalds committed
1007 1008 1009 1010 1011 1012 1013 1014
	} else {
		snd_pcm_trigger_tstamp(runtime->trigger_master);
		runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
	}
	runtime->trigger_master = NULL;
}

struct action_ops {
1015 1016 1017 1018
	int (*pre_action)(struct snd_pcm_substream *substream, int state);
	int (*do_action)(struct snd_pcm_substream *substream, int state);
	void (*undo_action)(struct snd_pcm_substream *substream, int state);
	void (*post_action)(struct snd_pcm_substream *substream, int state);
Linus Torvalds's avatar
Linus Torvalds committed
1019 1020 1021 1022 1023 1024 1025
};

/*
 *  this functions is core for handling of linked stream
 *  Note: the stream state might be changed also on failure
 *  Note2: call with calling stream lock + link lock
 */
1026
static int snd_pcm_action_group(const struct action_ops *ops,
1027
				struct snd_pcm_substream *substream,
Linus Torvalds's avatar
Linus Torvalds committed
1028 1029
				int state, int do_lock)
{
1030 1031
	struct snd_pcm_substream *s = NULL;
	struct snd_pcm_substream *s1;
1032
	int res = 0, depth = 1;
Linus Torvalds's avatar
Linus Torvalds committed
1033

1034
	snd_pcm_group_for_each_entry(s, substream) {
1035 1036
		if (do_lock && s != substream) {
			if (s->pcm->nonatomic)
1037
				mutex_lock_nested(&s->self_group.mutex, depth);
1038
			else
1039 1040
				spin_lock_nested(&s->self_group.lock, depth);
			depth++;
1041
		}
Linus Torvalds's avatar
Linus Torvalds committed
1042 1043 1044 1045
		res = ops->pre_action(s, state);
		if (res < 0)
			goto _unlock;
	}
1046
	snd_pcm_group_for_each_entry(s, substream) {
Linus Torvalds's avatar
Linus Torvalds committed
1047 1048 1049
		res = ops->do_action(s, state);
		if (res < 0) {
			if (ops->undo_action) {
1050
				snd_pcm_group_for_each_entry(s1, substream) {
Linus Torvalds's avatar
Linus Torvalds committed
1051 1052 1053 1054 1055 1056 1057 1058 1059
					if (s1 == s) /* failed stream */
						break;
					ops->undo_action(s1, state);
				}
			}
			s = NULL; /* unlock all */
			goto _unlock;
		}
	}
1060
	snd_pcm_group_for_each_entry(s, substream) {
Linus Torvalds's avatar
Linus Torvalds committed
1061 1062 1063 1064 1065
		ops->post_action(s, state);
	}
 _unlock:
	if (do_lock) {
		/* unlock streams */
1066
		snd_pcm_group_for_each_entry(s1, substream) {
1067
			if (s1 != substream) {
1068
				if (s1->pcm->nonatomic)
1069 1070 1071 1072
					mutex_unlock(&s1->self_group.mutex);
				else
					spin_unlock(&s1->self_group.lock);
			}
Linus Torvalds's avatar
Linus Torvalds committed
1073 1074 1075 1076 1077 1078 1079 1080 1081 1082
			if (s1 == s)	/* end */
				break;
		}
	}
	return res;
}

/*
 *  Note: call with stream lock
 */
1083
static int snd_pcm_action_single(const struct action_ops *ops,
1084
				 struct snd_pcm_substream *substream,
Linus Torvalds's avatar
Linus Torvalds committed
1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099
				 int state)
{
	int res;
	
	res = ops->pre_action(substream, state);
	if (res < 0)
		return res;
	res = ops->do_action(substream, state);
	if (res == 0)
		ops->post_action(substream, state);
	else if (ops->undo_action)
		ops->undo_action(substream, state);
	return res;
}

1100 1101 1102
/*
 *  Note: call with stream lock
 */
1103
static int snd_pcm_action(const struct action_ops *ops,
1104 1105
			  struct snd_pcm_substream *substream,
			  int state)
1106 1107 1108
{
	int res;

1109 1110 1111 1112
	if (!snd_pcm_stream_linked(substream))
		return snd_pcm_action_single(ops, substream, state);

	if (substream->pcm->nonatomic) {
1113 1114 1115 1116 1117 1118 1119 1120
		if (!mutex_trylock(&substream->group->mutex)) {
			mutex_unlock(&substream->self_group.mutex);
			mutex_lock(&substream->group->mutex);
			mutex_lock(&substream->self_group.mutex);
		}
		res = snd_pcm_action_group(ops, substream, state, 1);
		mutex_unlock(&substream->group->mutex);
	} else {
Linus Torvalds's avatar
Linus Torvalds committed
1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134
		if (!spin_trylock(&substream->group->lock)) {
			spin_unlock(&substream->self_group.lock);
			spin_lock(&substream->group->lock);
			spin_lock(&substream->self_group.lock);
		}
		res = snd_pcm_action_group(ops, substream, state, 1);
		spin_unlock(&substream->group->lock);
	}
	return res;
}

/*
 *  Note: don't use any locks before
 */
1135
static int snd_pcm_action_lock_irq(const struct action_ops *ops,
1136
				   struct snd_pcm_substream *substream,
Linus Torvalds's avatar
Linus Torvalds committed
1137 1138 1139 1140
				   int state)
{
	int res;

1141 1142 1143
	snd_pcm_stream_lock_irq(substream);
	res = snd_pcm_action(ops, substream, state);
	snd_pcm_stream_unlock_irq(substream);
Linus Torvalds's avatar
Linus Torvalds committed
1144 1145 1146 1147 1148
	return res;
}

/*
 */
1149
static int snd_pcm_action_nonatomic(const struct action_ops *ops,
1150
				    struct snd_pcm_substream *substream,
Linus Torvalds's avatar
Linus Torvalds committed
1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166
				    int state)
{
	int res;

	down_read(&snd_pcm_link_rwsem);
	if (snd_pcm_stream_linked(substream))
		res = snd_pcm_action_group(ops, substream, state, 0);
	else
		res = snd_pcm_action_single(ops, substream, state);
	up_read(&snd_pcm_link_rwsem);
	return res;
}

/*
 * start callbacks
 */
1167
static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
Linus Torvalds's avatar
Linus Torvalds committed
1168
{
1169
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
1170 1171 1172 1173 1174
	if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
		return -EBADFD;
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
	    !snd_pcm_playback_data(substream))
		return -EPIPE;
1175
	runtime->trigger_tstamp_latched = false;
Linus Torvalds's avatar
Linus Torvalds committed
1176 1177 1178 1179
	runtime->trigger_master = substream;
	return 0;
}

1180
static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
Linus Torvalds's avatar
Linus Torvalds committed
1181 1182 1183 1184 1185 1186
{
	if (substream->runtime->trigger_master != substream)
		return 0;
	return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
}

1187
static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
Linus Torvalds's avatar
Linus Torvalds committed
1188 1189 1190 1191 1192
{
	if (substream->runtime->trigger_master == substream)
		substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
}

1193
static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
Linus Torvalds's avatar
Linus Torvalds committed
1194
{
1195
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
1196
	snd_pcm_trigger_tstamp(substream);
1197
	runtime->hw_ptr_jiffies = jiffies;
1198 1199
	runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 
							    runtime->rate;
Linus Torvalds's avatar
Linus Torvalds committed
1200 1201 1202 1203
	runtime->status->state = state;
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
	    runtime->silence_size > 0)
		snd_pcm_playback_silence(substream, ULONG_MAX);
1204
	snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART);
Linus Torvalds's avatar
Linus Torvalds committed
1205 1206
}

1207
static const struct action_ops snd_pcm_action_start = {
Linus Torvalds's avatar
Linus Torvalds committed
1208 1209 1210 1211 1212 1213 1214
	.pre_action = snd_pcm_pre_start,
	.do_action = snd_pcm_do_start,
	.undo_action = snd_pcm_undo_start,
	.post_action = snd_pcm_post_start
};

/**
1215
 * snd_pcm_start - start all linked streams
Takashi Iwai's avatar
Takashi Iwai committed
1216
 * @substream: the PCM substream instance
1217 1218
 *
 * Return: Zero if successful, or a negative error code.
1219
 * The stream lock must be acquired before calling this function.
Linus Torvalds's avatar
Linus Torvalds committed
1220
 */
1221
int snd_pcm_start(struct snd_pcm_substream *substream)
Linus Torvalds's avatar
Linus Torvalds committed
1222
{
1223 1224
	return snd_pcm_action(&snd_pcm_action_start, substream,
			      SNDRV_PCM_STATE_RUNNING);
Linus Torvalds's avatar
Linus Torvalds committed
1225 1226
}

1227 1228 1229 1230 1231 1232 1233
/* take the stream lock and start the streams */
static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream)
{
	return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream,
				       SNDRV_PCM_STATE_RUNNING);
}

Linus Torvalds's avatar
Linus Torvalds committed
1234 1235 1236
/*
 * stop callbacks
 */
1237
static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
Linus Torvalds's avatar
Linus Torvalds committed
1238
{
1239
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
1240 1241 1242 1243 1244 1245
	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
		return -EBADFD;
	runtime->trigger_master = substream;
	return 0;
}

1246
static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
Linus Torvalds's avatar
Linus Torvalds committed
1247 1248 1249 1250 1251 1252 1253
{
	if (substream->runtime->trigger_master == substream &&
	    snd_pcm_running(substream))
		substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
	return 0; /* unconditonally stop all substreams */
}

1254
static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
Linus Torvalds's avatar
Linus Torvalds committed
1255
{
1256
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
1257 1258
	if (runtime->status->state != state) {
		snd_pcm_trigger_tstamp(substream);
1259
		runtime->status->state = state;
1260
		snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP);
Linus Torvalds's avatar
Linus Torvalds committed
1261 1262
	}
	wake_up(&runtime->sleep);
1263
	wake_up(&runtime->tsleep);
Linus Torvalds's avatar
Linus Torvalds committed
1264 1265
}

1266
static const struct action_ops snd_pcm_action_stop = {
Linus Torvalds's avatar
Linus Torvalds committed
1267 1268 1269 1270 1271 1272
	.pre_action = snd_pcm_pre_stop,
	.do_action = snd_pcm_do_stop,
	.post_action = snd_pcm_post_stop
};

/**
1273
 * snd_pcm_stop - try to stop all running streams in the substream group
Takashi Iwai's avatar
Takashi Iwai committed
1274 1275
 * @substream: the PCM substream instance
 * @state: PCM state after stopping the stream
Linus Torvalds's avatar
Linus Torvalds committed
1276
 *
1277
 * The state of each stream is then changed to the given state unconditionally.
1278
 *
1279
 * Return: Zero if successful, or a negative error code.
Linus Torvalds's avatar
Linus Torvalds committed
1280
 */
1281
int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
Linus Torvalds's avatar
Linus Torvalds committed
1282 1283 1284 1285
{
	return snd_pcm_action(&snd_pcm_action_stop, substream, state);
}

1286 1287
EXPORT_SYMBOL(snd_pcm_stop);

Linus Torvalds's avatar
Linus Torvalds committed
1288
/**
1289
 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
Takashi Iwai's avatar
Takashi Iwai committed
1290
 * @substream: the PCM substream
Linus Torvalds's avatar
Linus Torvalds committed
1291
 *
1292
 * After stopping, the state is changed to SETUP.
Linus Torvalds's avatar
Linus Torvalds committed
1293
 * Unlike snd_pcm_stop(), this affects only the given stream.
1294 1295
 *
 * Return: Zero if succesful, or a negative error code.
Linus Torvalds's avatar
Linus Torvalds committed
1296
 */
1297
int snd_pcm_drain_done(struct snd_pcm_substream *substream)
Linus Torvalds's avatar
Linus Torvalds committed
1298
{
1299 1300
	return snd_pcm_action_single(&snd_pcm_action_stop, substream,
				     SNDRV_PCM_STATE_SETUP);
Linus Torvalds's avatar
Linus Torvalds committed
1301 1302
}

1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324
/**
 * snd_pcm_stop_xrun - stop the running streams as XRUN
 * @substream: the PCM substream instance
 *
 * This stops the given running substream (and all linked substreams) as XRUN.
 * Unlike snd_pcm_stop(), this function takes the substream lock by itself.
 *
 * Return: Zero if successful, or a negative error code.
 */
int snd_pcm_stop_xrun(struct snd_pcm_substream *substream)
{
	unsigned long flags;
	int ret = 0;

	snd_pcm_stream_lock_irqsave(substream, flags);
	if (snd_pcm_running(substream))
		ret = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
	snd_pcm_stream_unlock_irqrestore(substream, flags);
	return ret;
}
EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);

Linus Torvalds's avatar
Linus Torvalds committed
1325 1326 1327
/*
 * pause callbacks
 */
1328
static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
Linus Torvalds's avatar
Linus Torvalds committed
1329
{
1330
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341
	if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
		return -ENOSYS;
	if (push) {
		if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
			return -EBADFD;
	} else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
		return -EBADFD;
	runtime->trigger_master = substream;
	return 0;
}

1342
static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
Linus Torvalds's avatar
Linus Torvalds committed
1343 1344 1345
{
	if (substream->runtime->trigger_master != substream)
		return 0;
1346 1347 1348 1349
	/* some drivers might use hw_ptr to recover from the pause -
	   update the hw_ptr now */
	if (push)
		snd_pcm_update_hw_ptr(substream);
1350
	/* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1351
	 * a delta between the current jiffies, this gives a large enough
1352 1353 1354
	 * delta, effectively to skip the check once.
	 */
	substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
Linus Torvalds's avatar
Linus Torvalds committed
1355 1356 1357 1358 1359
	return substream->ops->trigger(substream,
				       push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
					      SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
}

1360
static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
Linus Torvalds's avatar
Linus Torvalds committed
1361 1362 1363 1364 1365 1366 1367
{
	if (substream->runtime->trigger_master == substream)
		substream->ops->trigger(substream,
					push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
					SNDRV_PCM_TRIGGER_PAUSE_PUSH);
}

1368
static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
Linus Torvalds's avatar
Linus Torvalds committed
1369
{
1370
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
1371 1372 1373
	snd_pcm_trigger_tstamp(substream);
	if (push) {
		runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1374
		snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE);
Linus Torvalds's avatar
Linus Torvalds committed
1375
		wake_up(&runtime->sleep);
1376
		wake_up(&runtime->tsleep);
Linus Torvalds's avatar
Linus Torvalds committed
1377 1378
	} else {
		runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1379
		snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE);
Linus Torvalds's avatar
Linus Torvalds committed
1380 1381 1382
	}
}

1383
static const struct action_ops snd_pcm_action_pause = {
Linus Torvalds's avatar
Linus Torvalds committed
1384 1385 1386 1387 1388 1389 1390 1391 1392
	.pre_action = snd_pcm_pre_pause,
	.do_action = snd_pcm_do_pause,
	.undo_action = snd_pcm_undo_pause,
	.post_action = snd_pcm_post_pause
};

/*
 * Push/release the pause for all linked streams.
 */
1393
static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
Linus Torvalds's avatar
Linus Torvalds committed
1394 1395 1396 1397 1398 1399 1400
{
	return snd_pcm_action(&snd_pcm_action_pause, substream, push);
}

#ifdef CONFIG_PM
/* suspend */

1401
static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
Linus Torvalds's avatar
Linus Torvalds committed
1402
{
1403
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
1404 1405 1406 1407 1408 1409
	if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
		return -EBUSY;
	runtime->trigger_master = substream;
	return 0;
}

1410
static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
Linus Torvalds's avatar
Linus Torvalds committed
1411
{
1412
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
1413 1414 1415 1416 1417 1418 1419 1420
	if (runtime->trigger_master != substream)
		return 0;
	if (! snd_pcm_running(substream))
		return 0;
	substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
	return 0; /* suspend unconditionally */
}

1421
static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
Linus Torvalds's avatar
Linus Torvalds committed
1422
{
1423
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
1424
	snd_pcm_trigger_tstamp(substream);
1425 1426
	runtime->status->suspended_state = runtime->status->state;
	runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1427
	snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND);
Linus Torvalds's avatar
Linus Torvalds committed
1428
	wake_up(&runtime->sleep);
1429
	wake_up(&runtime->tsleep);
Linus Torvalds's avatar
Linus Torvalds committed
1430 1431
}

1432
static const struct action_ops snd_pcm_action_suspend = {
Linus Torvalds's avatar
Linus Torvalds committed
1433 1434 1435 1436 1437 1438
	.pre_action = snd_pcm_pre_suspend,
	.do_action = snd_pcm_do_suspend,
	.post_action = snd_pcm_post_suspend
};

/**
1439
 * snd_pcm_suspend - trigger SUSPEND to all linked streams
Takashi Iwai's avatar
Takashi Iwai committed
1440
 * @substream: the PCM substream
Linus Torvalds's avatar
Linus Torvalds committed
1441 1442
 *
 * After this call, all streams are changed to SUSPENDED state.
1443 1444 1445
 *
 * Return: Zero if successful (or @substream is %NULL), or a negative error
 * code.
Linus Torvalds's avatar
Linus Torvalds committed
1446
 */
1447
int snd_pcm_suspend(struct snd_pcm_substream *substream)
Linus Torvalds's avatar
Linus Torvalds committed
1448 1449 1450 1451
{
	int err;
	unsigned long flags;

1452 1453 1454
	if (! substream)
		return 0;

Linus Torvalds's avatar
Linus Torvalds committed
1455 1456 1457 1458 1459 1460
	snd_pcm_stream_lock_irqsave(substream, flags);
	err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
	snd_pcm_stream_unlock_irqrestore(substream, flags);
	return err;
}

1461 1462
EXPORT_SYMBOL(snd_pcm_suspend);

Linus Torvalds's avatar
Linus Torvalds committed
1463
/**
1464
 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
Takashi Iwai's avatar
Takashi Iwai committed
1465
 * @pcm: the PCM instance
Linus Torvalds's avatar
Linus Torvalds committed
1466 1467
 *
 * After this call, all streams are changed to SUSPENDED state.
1468 1469
 *
 * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
Linus Torvalds's avatar
Linus Torvalds committed
1470
 */
1471
int snd_pcm_suspend_all(struct snd_pcm *pcm)
Linus Torvalds's avatar
Linus Torvalds committed
1472
{
1473
	struct snd_pcm_substream *substream;
Linus Torvalds's avatar
Linus Torvalds committed
1474 1475
	int stream, err = 0;

1476 1477 1478
	if (! pcm)
		return 0;

Linus Torvalds's avatar
Linus Torvalds committed
1479
	for (stream = 0; stream < 2; stream++) {
1480 1481
		for (substream = pcm->streams[stream].substream;
		     substream; substream = substream->next) {
Linus Torvalds's avatar
Linus Torvalds committed
1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492
			/* FIXME: the open/close code should lock this as well */
			if (substream->runtime == NULL)
				continue;
			err = snd_pcm_suspend(substream);
			if (err < 0 && err != -EBUSY)
				return err;
		}
	}
	return 0;
}

1493 1494
EXPORT_SYMBOL(snd_pcm_suspend_all);

Linus Torvalds's avatar
Linus Torvalds committed
1495 1496
/* resume */

1497
static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
Linus Torvalds's avatar
Linus Torvalds committed
1498
{
1499
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
1500 1501 1502 1503 1504 1505
	if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
		return -ENOSYS;
	runtime->trigger_master = substream;
	return 0;
}

1506
static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
Linus Torvalds's avatar
Linus Torvalds committed
1507
{
1508
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
1509 1510 1511 1512 1513 1514 1515 1516 1517 1518
	if (runtime->trigger_master != substream)
		return 0;
	/* DMA not running previously? */
	if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
	    (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
	     substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
		return 0;
	return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
}

1519
static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
Linus Torvalds's avatar
Linus Torvalds committed
1520 1521 1522 1523 1524 1525
{
	if (substream->runtime->trigger_master == substream &&
	    snd_pcm_running(substream))
		substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
}

1526
static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
Linus Torvalds's avatar
Linus Torvalds committed
1527
{
1528
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
1529
	snd_pcm_trigger_tstamp(substream);
1530
	runtime->status->state = runtime->status->suspended_state;
1531
	snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME);
Linus Torvalds's avatar
Linus Torvalds committed
1532 1533
}

1534
static const struct action_ops snd_pcm_action_resume = {
Linus Torvalds's avatar
Linus Torvalds committed
1535 1536 1537 1538 1539 1540
	.pre_action = snd_pcm_pre_resume,
	.do_action = snd_pcm_do_resume,
	.undo_action = snd_pcm_undo_resume,
	.post_action = snd_pcm_post_resume
};

1541
static int snd_pcm_resume(struct snd_pcm_substream *substream)
Linus Torvalds's avatar
Linus Torvalds committed
1542
{
1543
	struct snd_card *card = substream->pcm->card;
Linus Torvalds's avatar
Linus Torvalds committed
1544 1545 1546
	int res;

	snd_power_lock(card);
1547
	if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
Linus Torvalds's avatar
Linus Torvalds committed
1548 1549 1550 1551 1552 1553 1554
		res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
	snd_power_unlock(card);
	return res;
}

#else

1555
static int snd_pcm_resume(struct snd_pcm_substream *substream)
Linus Torvalds's avatar
Linus Torvalds committed
1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566
{
	return -ENOSYS;
}

#endif /* CONFIG_PM */

/*
 * xrun ioctl
 *
 * Change the RUNNING stream(s) to XRUN state.
 */
1567
static int snd_pcm_xrun(struct snd_pcm_substream *substream)
Linus Torvalds's avatar
Linus Torvalds committed
1568
{
1569 1570
	struct snd_card *card = substream->pcm->card;
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
1571 1572 1573 1574
	int result;

	snd_power_lock(card);
	if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1575
		result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
Linus Torvalds's avatar
Linus Torvalds committed
1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599
		if (result < 0)
			goto _unlock;
	}

	snd_pcm_stream_lock_irq(substream);
	switch (runtime->status->state) {
	case SNDRV_PCM_STATE_XRUN:
		result = 0;	/* already there */
		break;
	case SNDRV_PCM_STATE_RUNNING:
		result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
		break;
	default:
		result = -EBADFD;
	}
	snd_pcm_stream_unlock_irq(substream);
 _unlock:
	snd_power_unlock(card);
	return result;
}

/*
 * reset ioctl
 */
1600
static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
Linus Torvalds's avatar
Linus Torvalds committed
1601
{
1602
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613
	switch (runtime->status->state) {
	case SNDRV_PCM_STATE_RUNNING:
	case SNDRV_PCM_STATE_PREPARED:
	case SNDRV_PCM_STATE_PAUSED:
	case SNDRV_PCM_STATE_SUSPENDED:
		return 0;
	default:
		return -EBADFD;
	}
}

1614
static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
Linus Torvalds's avatar
Linus Torvalds committed
1615
{
1616
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
1617 1618 1619 1620
	int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
	if (err < 0)
		return err;
	runtime->hw_ptr_base = 0;
1621 1622
	runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
		runtime->status->hw_ptr % runtime->period_size;
Linus Torvalds's avatar
Linus Torvalds committed
1623 1624 1625 1626 1627
	runtime->silence_start = runtime->status->hw_ptr;
	runtime->silence_filled = 0;
	return 0;
}

1628
static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
Linus Torvalds's avatar
Linus Torvalds committed
1629
{
1630
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
1631 1632 1633 1634 1635 1636
	runtime->control->appl_ptr = runtime->status->hw_ptr;
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
	    runtime->silence_size > 0)
		snd_pcm_playback_silence(substream, ULONG_MAX);
}

1637
static const struct action_ops snd_pcm_action_reset = {
Linus Torvalds's avatar
Linus Torvalds committed
1638 1639 1640 1641 1642
	.pre_action = snd_pcm_pre_reset,
	.do_action = snd_pcm_do_reset,
	.post_action = snd_pcm_post_reset
};

1643
static int snd_pcm_reset(struct snd_pcm_substream *substream)
Linus Torvalds's avatar
Linus Torvalds committed
1644 1645 1646 1647 1648 1649 1650
{
	return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
}

/*
 * prepare ioctl
 */
1651 1652 1653
/* we use the second argument for updating f_flags */
static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
			       int f_flags)
Linus Torvalds's avatar
Linus Torvalds committed
1654
{
1655
	struct snd_pcm_runtime *runtime = substream->runtime;
1656 1657
	if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
	    runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
Linus Torvalds's avatar
Linus Torvalds committed
1658 1659 1660
		return -EBADFD;
	if (snd_pcm_running(substream))
		return -EBUSY;
1661
	substream->f_flags = f_flags;
Linus Torvalds's avatar
Linus Torvalds committed
1662 1663 1664
	return 0;
}

1665
static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
Linus Torvalds's avatar
Linus Torvalds committed
1666 1667 1668 1669 1670 1671 1672 1673
{
	int err;
	err = substream->ops->prepare(substream);
	if (err < 0)
		return err;
	return snd_pcm_do_reset(substream, 0);
}

1674
static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
Linus Torvalds's avatar
Linus Torvalds committed
1675
{
1676
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
1677
	runtime->control->appl_ptr = runtime->status->hw_ptr;
1678
	snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
Linus Torvalds's avatar
Linus Torvalds committed
1679 1680
}

1681
static const struct action_ops snd_pcm_action_prepare = {
Linus Torvalds's avatar
Linus Torvalds committed
1682 1683 1684 1685 1686 1687
	.pre_action = snd_pcm_pre_prepare,
	.do_action = snd_pcm_do_prepare,
	.post_action = snd_pcm_post_prepare
};

/**
1688
 * snd_pcm_prepare - prepare the PCM substream to be triggerable
Takashi Iwai's avatar
Takashi Iwai committed
1689
 * @substream: the PCM substream instance
1690
 * @file: file to refer f_flags
1691 1692
 *
 * Return: Zero if successful, or a negative error code.
Linus Torvalds's avatar
Linus Torvalds committed
1693
 */
1694 1695
static int snd_pcm_prepare(struct snd_pcm_substream *substream,
			   struct file *file)
Linus Torvalds's avatar
Linus Torvalds committed
1696 1697
{
	int res;
1698
	struct snd_card *card = substream->pcm->card;
1699 1700 1701 1702 1703 1704
	int f_flags;

	if (file)
		f_flags = file->f_flags;
	else
		f_flags = substream->f_flags;
Linus Torvalds's avatar
Linus Torvalds committed
1705 1706

	snd_power_lock(card);
1707
	if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1708 1709
		res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
					       substream, f_flags);
Linus Torvalds's avatar
Linus Torvalds committed
1710 1711 1712 1713 1714 1715 1716 1717
	snd_power_unlock(card);
	return res;
}

/*
 * drain ioctl
 */

1718
static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
Linus Torvalds's avatar
Linus Torvalds committed
1719
{
1720 1721 1722 1723 1724 1725 1726 1727
	struct snd_pcm_runtime *runtime = substream->runtime;
	switch (runtime->status->state) {
	case SNDRV_PCM_STATE_OPEN:
	case SNDRV_PCM_STATE_DISCONNECTED:
	case SNDRV_PCM_STATE_SUSPENDED:
		return -EBADFD;
	}
	runtime->trigger_master = substream;
Linus Torvalds's avatar
Linus Torvalds committed
1728 1729 1730
	return 0;
}

1731
static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
Linus Torvalds's avatar
Linus Torvalds committed
1732
{
1733
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
1734 1735 1736 1737 1738 1739 1740
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		switch (runtime->status->state) {
		case SNDRV_PCM_STATE_PREPARED:
			/* start playback stream if possible */
			if (! snd_pcm_playback_empty(substream)) {
				snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
				snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1741 1742
			} else {
				runtime->status->state = SNDRV_PCM_STATE_SETUP;
Linus Torvalds's avatar
Linus Torvalds committed
1743 1744 1745 1746 1747
			}
			break;
		case SNDRV_PCM_STATE_RUNNING:
			runtime->status->state = SNDRV_PCM_STATE_DRAINING;
			break;
1748 1749 1750
		case SNDRV_PCM_STATE_XRUN:
			runtime->status->state = SNDRV_PCM_STATE_SETUP;
			break;
Linus Torvalds's avatar
Linus Torvalds committed
1751 1752 1753 1754 1755 1756
		default:
			break;
		}
	} else {
		/* stop running stream */
		if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1757
			int new_state = snd_pcm_capture_avail(runtime) > 0 ?
Linus Torvalds's avatar
Linus Torvalds committed
1758
				SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1759 1760
			snd_pcm_do_stop(substream, new_state);
			snd_pcm_post_stop(substream, new_state);
Linus Torvalds's avatar
Linus Torvalds committed
1761 1762
		}
	}
1763 1764 1765 1766 1767 1768 1769

	if (runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
	    runtime->trigger_master == substream &&
	    (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
		return substream->ops->trigger(substream,
					       SNDRV_PCM_TRIGGER_DRAIN);

Linus Torvalds's avatar
Linus Torvalds committed
1770 1771 1772
	return 0;
}

1773
static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
Linus Torvalds's avatar
Linus Torvalds committed
1774 1775 1776
{
}

1777
static const struct action_ops snd_pcm_action_drain_init = {
Linus Torvalds's avatar
Linus Torvalds committed
1778 1779 1780 1781 1782
	.pre_action = snd_pcm_pre_drain_init,
	.do_action = snd_pcm_do_drain_init,
	.post_action = snd_pcm_post_drain_init
};

1783
static int snd_pcm_drop(struct snd_pcm_substream *substream);
Linus Torvalds's avatar
Linus Torvalds committed
1784 1785 1786 1787 1788 1789 1790 1791

/*
 * Drain the stream(s).
 * When the substream is linked, sync until the draining of all playback streams
 * is finished.
 * After this call, all streams are supposed to be either SETUP or DRAINING
 * (capture only) state.
 */
1792 1793
static int snd_pcm_drain(struct snd_pcm_substream *substream,
			 struct file *file)
Linus Torvalds's avatar
Linus Torvalds committed
1794
{
1795 1796
	struct snd_card *card;
	struct snd_pcm_runtime *runtime;
1797
	struct snd_pcm_substream *s;
1798
	wait_queue_t wait;
Linus Torvalds's avatar
Linus Torvalds committed
1799
	int result = 0;
1800
	int nonblock = 0;
Linus Torvalds's avatar
Linus Torvalds committed
1801 1802 1803 1804 1805 1806 1807 1808 1809

	card = substream->pcm->card;
	runtime = substream->runtime;

	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
		return -EBADFD;

	snd_power_lock(card);
	if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1810
		result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1811 1812 1813 1814
		if (result < 0) {
			snd_power_unlock(card);
			return result;
		}
Linus Torvalds's avatar
Linus Torvalds committed
1815 1816
	}

1817 1818 1819 1820 1821 1822
	if (file) {
		if (file->f_flags & O_NONBLOCK)
			nonblock = 1;
	} else if (substream->f_flags & O_NONBLOCK)
		nonblock = 1;

1823 1824 1825
	down_read(&snd_pcm_link_rwsem);
	snd_pcm_stream_lock_irq(substream);
	/* resume pause */
1826
	if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1827 1828 1829 1830
		snd_pcm_pause(substream, 0);

	/* pre-start/stop - all running streams are changed to DRAINING state */
	result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1831 1832 1833 1834 1835 1836
	if (result < 0)
		goto unlock;
	/* in non-blocking, we don't wait in ioctl but let caller poll */
	if (nonblock) {
		result = -EAGAIN;
		goto unlock;
1837
	}
Linus Torvalds's avatar
Linus Torvalds committed
1838 1839 1840

	for (;;) {
		long tout;
1841
		struct snd_pcm_runtime *to_check;
Linus Torvalds's avatar
Linus Torvalds committed
1842 1843 1844 1845
		if (signal_pending(current)) {
			result = -ERESTARTSYS;
			break;
		}
1846 1847 1848 1849 1850 1851 1852 1853
		/* find a substream to drain */
		to_check = NULL;
		snd_pcm_group_for_each_entry(s, substream) {
			if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
				continue;
			runtime = s->runtime;
			if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
				to_check = runtime;
1854
				break;
1855
			}
1856
		}
1857 1858 1859 1860
		if (!to_check)
			break; /* all drained */
		init_waitqueue_entry(&wait, current);
		add_wait_queue(&to_check->sleep, &wait);
Linus Torvalds's avatar
Linus Torvalds committed
1861
		snd_pcm_stream_unlock_irq(substream);
1862
		up_read(&snd_pcm_link_rwsem);
Linus Torvalds's avatar
Linus Torvalds committed
1863
		snd_power_unlock(card);
1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874
		if (runtime->no_period_wakeup)
			tout = MAX_SCHEDULE_TIMEOUT;
		else {
			tout = 10;
			if (runtime->rate) {
				long t = runtime->period_size * 2 / runtime->rate;
				tout = max(t, tout);
			}
			tout = msecs_to_jiffies(tout * 1000);
		}
		tout = schedule_timeout_interruptible(tout);
Linus Torvalds's avatar
Linus Torvalds committed
1875
		snd_power_lock(card);
1876
		down_read(&snd_pcm_link_rwsem);
Linus Torvalds's avatar
Linus Torvalds committed
1877
		snd_pcm_stream_lock_irq(substream);
1878
		remove_wait_queue(&to_check->sleep, &wait);
1879 1880 1881 1882
		if (card->shutdown) {
			result = -ENODEV;
			break;
		}
Linus Torvalds's avatar
Linus Torvalds committed
1883 1884 1885 1886
		if (tout == 0) {
			if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
				result = -ESTRPIPE;
			else {
1887 1888
				dev_dbg(substream->pcm->card->dev,
					"playback drain error (DMA or IRQ trouble?)\n");
Linus Torvalds's avatar
Linus Torvalds committed
1889 1890 1891 1892 1893 1894
				snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
				result = -EIO;
			}
			break;
		}
	}
1895

1896
 unlock:
1897
	snd_pcm_stream_unlock_irq(substream);
1898
	up_read(&snd_pcm_link_rwsem);
Linus Torvalds's avatar
Linus Torvalds committed
1899 1900 1901 1902 1903 1904 1905 1906 1907 1908
	snd_power_unlock(card);

	return result;
}

/*
 * drop ioctl
 *
 * Immediately put all linked substreams into SETUP state.
 */
1909
static int snd_pcm_drop(struct snd_pcm_substream *substream)
Linus Torvalds's avatar
Linus Torvalds committed
1910
{
1911
	struct snd_pcm_runtime *runtime;
Linus Torvalds's avatar
Linus Torvalds committed
1912 1913
	int result = 0;
	
1914 1915
	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
Linus Torvalds's avatar
Linus Torvalds committed
1916 1917
	runtime = substream->runtime;

1918
	if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1919 1920
	    runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
	    runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
Linus Torvalds's avatar
Linus Torvalds committed
1921 1922 1923 1924 1925 1926 1927 1928 1929 1930
		return -EBADFD;

	snd_pcm_stream_lock_irq(substream);
	/* resume pause */
	if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
		snd_pcm_pause(substream, 0);

	snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
	/* runtime->control->appl_ptr = runtime->status->hw_ptr; */
	snd_pcm_stream_unlock_irq(substream);
1931

Linus Torvalds's avatar
Linus Torvalds committed
1932 1933 1934 1935
	return result;
}


1936
static bool is_pcm_file(struct file *file)
Linus Torvalds's avatar
Linus Torvalds committed
1937
{
1938
	struct inode *inode = file_inode(file);
1939 1940
	unsigned int minor;

1941 1942
	if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
		return false;
Linus Torvalds's avatar
Linus Torvalds committed
1943
	minor = iminor(inode);
1944 1945
	return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) ||
		snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
Linus Torvalds's avatar
Linus Torvalds committed
1946 1947 1948 1949 1950
}

/*
 * PCM link handling
 */
1951
static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
Linus Torvalds's avatar
Linus Torvalds committed
1952 1953
{
	int res = 0;
1954 1955
	struct snd_pcm_file *pcm_file;
	struct snd_pcm_substream *substream1;
1956
	struct snd_pcm_group *group;
1957
	struct fd f = fdget(fd);
Linus Torvalds's avatar
Linus Torvalds committed
1958

1959
	if (!f.file)
Linus Torvalds's avatar
Linus Torvalds committed
1960
		return -EBADFD;
1961 1962 1963 1964 1965
	if (!is_pcm_file(f.file)) {
		res = -EBADFD;
		goto _badf;
	}
	pcm_file = f.file->private_data;
Linus Torvalds's avatar
Linus Torvalds committed
1966
	substream1 = pcm_file->substream;
1967 1968 1969 1970 1971
	group = kmalloc(sizeof(*group), GFP_KERNEL);
	if (!group) {
		res = -ENOMEM;
		goto _nolock;
	}
1972
	down_write_nonblock(&snd_pcm_link_rwsem);
Linus Torvalds's avatar
Linus Torvalds committed
1973 1974
	write_lock_irq(&snd_pcm_link_rwlock);
	if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1975 1976
	    substream->runtime->status->state != substream1->runtime->status->state ||
	    substream->pcm->nonatomic != substream1->pcm->nonatomic) {
Linus Torvalds's avatar
Linus Torvalds committed
1977 1978 1979 1980 1981 1982 1983 1984
		res = -EBADFD;
		goto _end;
	}
	if (snd_pcm_stream_linked(substream1)) {
		res = -EALREADY;
		goto _end;
	}
	if (!snd_pcm_stream_linked(substream)) {
1985
		substream->group = group;
Al Viro's avatar
Al Viro committed
1986
		group = NULL;
Linus Torvalds's avatar
Linus Torvalds committed
1987
		spin_lock_init(&substream->group->lock);
1988
		mutex_init(&substream->group->mutex);
Linus Torvalds's avatar
Linus Torvalds committed
1989 1990 1991 1992 1993 1994 1995 1996 1997 1998
		INIT_LIST_HEAD(&substream->group->substreams);
		list_add_tail(&substream->link_list, &substream->group->substreams);
		substream->group->count = 1;
	}
	list_add_tail(&substream1->link_list, &substream->group->substreams);
	substream->group->count++;
	substream1->group = substream->group;
 _end:
	write_unlock_irq(&snd_pcm_link_rwlock);
	up_write(&snd_pcm_link_rwsem);
1999
 _nolock:
2000
	snd_card_unref(substream1->pcm->card);
Al Viro's avatar
Al Viro committed
2001
	kfree(group);
2002 2003
 _badf:
	fdput(f);
Linus Torvalds's avatar
Linus Torvalds committed
2004 2005 2006
	return res;
}

2007
static void relink_to_local(struct snd_pcm_substream *substream)
Linus Torvalds's avatar
Linus Torvalds committed
2008 2009 2010 2011 2012 2013
{
	substream->group = &substream->self_group;
	INIT_LIST_HEAD(&substream->self_group.substreams);
	list_add_tail(&substream->link_list, &substream->self_group.substreams);
}

2014
static int snd_pcm_unlink(struct snd_pcm_substream *substream)
Linus Torvalds's avatar
Linus Torvalds committed
2015
{
2016
	struct snd_pcm_substream *s;
Linus Torvalds's avatar
Linus Torvalds committed
2017 2018
	int res = 0;

2019
	down_write_nonblock(&snd_pcm_link_rwsem);
Linus Torvalds's avatar
Linus Torvalds committed
2020 2021 2022 2023 2024 2025 2026 2027
	write_lock_irq(&snd_pcm_link_rwlock);
	if (!snd_pcm_stream_linked(substream)) {
		res = -EALREADY;
		goto _end;
	}
	list_del(&substream->link_list);
	substream->group->count--;
	if (substream->group->count == 1) {	/* detach the last stream, too */
2028 2029
		snd_pcm_group_for_each_entry(s, substream) {
			relink_to_local(s);
Linus Torvalds's avatar
Linus Torvalds committed
2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043
			break;
		}
		kfree(substream->group);
	}
	relink_to_local(substream);
       _end:
	write_unlock_irq(&snd_pcm_link_rwlock);
	up_write(&snd_pcm_link_rwsem);
	return res;
}

/*
 * hw configurator
 */
2044 2045
static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
			       struct snd_pcm_hw_rule *rule)
Linus Torvalds's avatar
Linus Torvalds committed
2046
{
2047
	struct snd_interval t;
Linus Torvalds's avatar
Linus Torvalds committed
2048 2049 2050 2051 2052
	snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
		     hw_param_interval_c(params, rule->deps[1]), &t);
	return snd_interval_refine(hw_param_interval(params, rule->var), &t);
}

2053 2054
static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
			       struct snd_pcm_hw_rule *rule)
Linus Torvalds's avatar
Linus Torvalds committed
2055
{
2056
	struct snd_interval t;
Linus Torvalds's avatar
Linus Torvalds committed
2057 2058 2059 2060 2061
	snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
		     hw_param_interval_c(params, rule->deps[1]), &t);
	return snd_interval_refine(hw_param_interval(params, rule->var), &t);
}

2062 2063
static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
				   struct snd_pcm_hw_rule *rule)
Linus Torvalds's avatar
Linus Torvalds committed
2064
{
2065
	struct snd_interval t;
Linus Torvalds's avatar
Linus Torvalds committed
2066 2067 2068 2069 2070 2071
	snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
			 hw_param_interval_c(params, rule->deps[1]),
			 (unsigned long) rule->private, &t);
	return snd_interval_refine(hw_param_interval(params, rule->var), &t);
}

2072 2073
static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
				   struct snd_pcm_hw_rule *rule)
Linus Torvalds's avatar
Linus Torvalds committed
2074
{
2075
	struct snd_interval t;
Linus Torvalds's avatar
Linus Torvalds committed
2076 2077 2078 2079 2080 2081
	snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
			 (unsigned long) rule->private,
			 hw_param_interval_c(params, rule->deps[1]), &t);
	return snd_interval_refine(hw_param_interval(params, rule->var), &t);
}

2082 2083
static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
				  struct snd_pcm_hw_rule *rule)
Linus Torvalds's avatar
Linus Torvalds committed
2084 2085
{
	unsigned int k;
2086 2087
	const struct snd_interval *i =
				hw_param_interval_c(params, rule->deps[0]);
2088 2089
	struct snd_mask m;
	struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
Linus Torvalds's avatar
Linus Torvalds committed
2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103
	snd_mask_any(&m);
	for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
		int bits;
		if (! snd_mask_test(mask, k))
			continue;
		bits = snd_pcm_format_physical_width(k);
		if (bits <= 0)
			continue; /* ignore invalid formats */
		if ((unsigned)bits < i->min || (unsigned)bits > i->max)
			snd_mask_reset(&m, k);
	}
	return snd_mask_refine(mask, &m);
}

2104 2105
static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
				       struct snd_pcm_hw_rule *rule)
Linus Torvalds's avatar
Linus Torvalds committed
2106
{
2107
	struct snd_interval t;
Linus Torvalds's avatar
Linus Torvalds committed
2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132
	unsigned int k;
	t.min = UINT_MAX;
	t.max = 0;
	t.openmin = 0;
	t.openmax = 0;
	for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
		int bits;
		if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
			continue;
		bits = snd_pcm_format_physical_width(k);
		if (bits <= 0)
			continue; /* ignore invalid formats */
		if (t.min > (unsigned)bits)
			t.min = bits;
		if (t.max < (unsigned)bits)
			t.max = bits;
	}
	t.integer = 1;
	return snd_interval_refine(hw_param_interval(params, rule->var), &t);
}

#if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
#error "Change this table"
#endif

2133 2134 2135 2136
static const unsigned int rates[] = {
	5512, 8000, 11025, 16000, 22050, 32000, 44100,
	48000, 64000, 88200, 96000, 176400, 192000
};
Linus Torvalds's avatar
Linus Torvalds committed
2137

2138 2139 2140 2141 2142
const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
	.count = ARRAY_SIZE(rates),
	.list = rates,
};

2143 2144
static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
				struct snd_pcm_hw_rule *rule)
Linus Torvalds's avatar
Linus Torvalds committed
2145
{
2146
	struct snd_pcm_hardware *hw = rule->private;
Linus Torvalds's avatar
Linus Torvalds committed
2147
	return snd_interval_list(hw_param_interval(params, rule->var),
2148 2149
				 snd_pcm_known_rates.count,
				 snd_pcm_known_rates.list, hw->rates);
Linus Torvalds's avatar
Linus Torvalds committed
2150 2151
}		

2152 2153
static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
					    struct snd_pcm_hw_rule *rule)
Linus Torvalds's avatar
Linus Torvalds committed
2154
{
2155 2156
	struct snd_interval t;
	struct snd_pcm_substream *substream = rule->private;
Linus Torvalds's avatar
Linus Torvalds committed
2157 2158 2159 2160 2161 2162 2163 2164
	t.min = 0;
	t.max = substream->buffer_bytes_max;
	t.openmin = 0;
	t.openmax = 0;
	t.integer = 1;
	return snd_interval_refine(hw_param_interval(params, rule->var), &t);
}		

2165
int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
Linus Torvalds's avatar
Linus Torvalds committed
2166
{
2167 2168
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
Linus Torvalds's avatar
Linus Torvalds committed
2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288
	int k, err;

	for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
		snd_mask_any(constrs_mask(constrs, k));
	}

	for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
		snd_interval_any(constrs_interval(constrs, k));
	}

	snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
	snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
	snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
	snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
	snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));

	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
				   snd_pcm_hw_rule_format, NULL,
				   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 
				  snd_pcm_hw_rule_sample_bits, NULL,
				  SNDRV_PCM_HW_PARAM_FORMAT, 
				  SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 
				  snd_pcm_hw_rule_div, NULL,
				  SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 
				  snd_pcm_hw_rule_mul, NULL,
				  SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 
				  snd_pcm_hw_rule_mulkdiv, (void*) 8,
				  SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 
				  snd_pcm_hw_rule_mulkdiv, (void*) 8,
				  SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 
				  snd_pcm_hw_rule_div, NULL,
				  SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 
				  snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
				  SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 
				  snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
				  SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 
				  snd_pcm_hw_rule_div, NULL,
				  SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 
				  snd_pcm_hw_rule_div, NULL,
				  SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 
				  snd_pcm_hw_rule_mulkdiv, (void*) 8,
				  SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 
				  snd_pcm_hw_rule_muldivk, (void*) 1000000,
				  SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 
				  snd_pcm_hw_rule_mul, NULL,
				  SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 
				  snd_pcm_hw_rule_mulkdiv, (void*) 8,
				  SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 
				  snd_pcm_hw_rule_muldivk, (void*) 1000000,
				  SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 
				  snd_pcm_hw_rule_muldivk, (void*) 8,
				  SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 
				  snd_pcm_hw_rule_muldivk, (void*) 8,
				  SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 
				  snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
				  SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
	if (err < 0)
		return err;
	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 
				  snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
				  SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
	if (err < 0)
		return err;
	return 0;
}

2289
int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
Linus Torvalds's avatar
Linus Torvalds committed
2290
{
2291 2292
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_pcm_hardware *hw = &runtime->hw;
Linus Torvalds's avatar
Linus Torvalds committed
2293 2294 2295 2296 2297 2298 2299
	int err;
	unsigned int mask = 0;

        if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
		mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
        if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
		mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
2300
	if (hw_support_mmap(substream)) {
Linus Torvalds's avatar
Linus Torvalds committed
2301 2302 2303 2304 2305 2306 2307 2308
		if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
			mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
		if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
			mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
		if (hw->info & SNDRV_PCM_INFO_COMPLEX)
			mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
	}
	err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
2309 2310
	if (err < 0)
		return err;
Linus Torvalds's avatar
Linus Torvalds committed
2311 2312

	err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2313 2314
	if (err < 0)
		return err;
Linus Torvalds's avatar
Linus Torvalds committed
2315 2316

	err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
2317 2318
	if (err < 0)
		return err;
Linus Torvalds's avatar
Linus Torvalds committed
2319 2320 2321

	err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
					   hw->channels_min, hw->channels_max);
2322 2323
	if (err < 0)
		return err;
Linus Torvalds's avatar
Linus Torvalds committed
2324 2325 2326

	err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
					   hw->rate_min, hw->rate_max);
2327 2328
	if (err < 0)
		return err;
Linus Torvalds's avatar
Linus Torvalds committed
2329 2330 2331

	err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
					   hw->period_bytes_min, hw->period_bytes_max);
2332 2333
	if (err < 0)
		return err;
Linus Torvalds's avatar
Linus Torvalds committed
2334 2335 2336

	err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
					   hw->periods_min, hw->periods_max);
2337 2338
	if (err < 0)
		return err;
Linus Torvalds's avatar
Linus Torvalds committed
2339 2340 2341

	err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
					   hw->period_bytes_min, hw->buffer_bytes_max);
2342 2343
	if (err < 0)
		return err;
Linus Torvalds's avatar
Linus Torvalds committed
2344 2345 2346 2347 2348 2349 2350 2351 2352 2353

	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 
				  snd_pcm_hw_rule_buffer_bytes_max, substream,
				  SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
	if (err < 0)
		return err;

	/* FIXME: remove */
	if (runtime->dma_bytes) {
		err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2354
		if (err < 0)
2355
			return err;
Linus Torvalds's avatar
Linus Torvalds committed
2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371
	}

	if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
		err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 
					  snd_pcm_hw_rule_rate, hw,
					  SNDRV_PCM_HW_PARAM_RATE, -1);
		if (err < 0)
			return err;
	}

	/* FIXME: this belong to lowlevel */
	snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);

	return 0;
}

2372
static void pcm_release_private(struct snd_pcm_substream *substream)
Linus Torvalds's avatar
Linus Torvalds committed
2373 2374
{
	snd_pcm_unlink(substream);
2375 2376 2377 2378
}

void snd_pcm_release_substream(struct snd_pcm_substream *substream)
{
2379 2380 2381 2382
	substream->ref_count--;
	if (substream->ref_count > 0)
		return;

2383 2384
	snd_pcm_drop(substream);
	if (substream->hw_opened) {
2385 2386
		if (substream->ops->hw_free &&
		    substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
Linus Torvalds's avatar
Linus Torvalds committed
2387 2388
			substream->ops->hw_free(substream);
		substream->ops->close(substream);
2389
		substream->hw_opened = 0;
Linus Torvalds's avatar
Linus Torvalds committed
2390
	}
2391 2392
	if (pm_qos_request_active(&substream->latency_pm_qos_req))
		pm_qos_remove_request(&substream->latency_pm_qos_req);
2393 2394 2395 2396
	if (substream->pcm_release) {
		substream->pcm_release(substream);
		substream->pcm_release = NULL;
	}
2397 2398 2399
	snd_pcm_detach_substream(substream);
}

2400 2401
EXPORT_SYMBOL(snd_pcm_release_substream);

2402 2403 2404 2405 2406 2407 2408 2409 2410 2411
int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
			   struct file *file,
			   struct snd_pcm_substream **rsubstream)
{
	struct snd_pcm_substream *substream;
	int err;

	err = snd_pcm_attach_substream(pcm, stream, file, &substream);
	if (err < 0)
		return err;
2412 2413 2414 2415 2416
	if (substream->ref_count > 1) {
		*rsubstream = substream;
		return 0;
	}

2417 2418
	err = snd_pcm_hw_constraints_init(substream);
	if (err < 0) {
2419
		pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2420 2421 2422 2423 2424 2425 2426 2427 2428 2429
		goto error;
	}

	if ((err = substream->ops->open(substream)) < 0)
		goto error;

	substream->hw_opened = 1;

	err = snd_pcm_hw_constraints_complete(substream);
	if (err < 0) {
2430
		pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2431 2432 2433 2434
		goto error;
	}

	*rsubstream = substream;
Linus Torvalds's avatar
Linus Torvalds committed
2435
	return 0;
2436 2437 2438 2439

 error:
	snd_pcm_release_substream(substream);
	return err;
Linus Torvalds's avatar
Linus Torvalds committed
2440 2441
}

2442 2443
EXPORT_SYMBOL(snd_pcm_open_substream);

Linus Torvalds's avatar
Linus Torvalds committed
2444
static int snd_pcm_open_file(struct file *file,
2445
			     struct snd_pcm *pcm,
2446
			     int stream)
Linus Torvalds's avatar
Linus Torvalds committed
2447
{
2448 2449
	struct snd_pcm_file *pcm_file;
	struct snd_pcm_substream *substream;
2450
	int err;
Linus Torvalds's avatar
Linus Torvalds committed
2451

2452 2453 2454 2455
	err = snd_pcm_open_substream(pcm, stream, file, &substream);
	if (err < 0)
		return err;

2456 2457 2458 2459 2460 2461 2462
	pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
	if (pcm_file == NULL) {
		snd_pcm_release_substream(substream);
		return -ENOMEM;
	}
	pcm_file->substream = substream;
	if (substream->ref_count == 1) {
2463 2464
		substream->file = pcm_file;
		substream->pcm_release = pcm_release_private;
Linus Torvalds's avatar
Linus Torvalds committed
2465 2466
	}
	file->private_data = pcm_file;
2467

Linus Torvalds's avatar
Linus Torvalds committed
2468 2469 2470
	return 0;
}

2471 2472 2473
static int snd_pcm_playback_open(struct inode *inode, struct file *file)
{
	struct snd_pcm *pcm;
2474 2475 2476
	int err = nonseekable_open(inode, file);
	if (err < 0)
		return err;
2477 2478
	pcm = snd_lookup_minor_data(iminor(inode),
				    SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2479
	err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2480 2481
	if (pcm)
		snd_card_unref(pcm->card);
2482
	return err;
2483 2484 2485
}

static int snd_pcm_capture_open(struct inode *inode, struct file *file)
Linus Torvalds's avatar
Linus Torvalds committed
2486
{
2487
	struct snd_pcm *pcm;
2488 2489 2490
	int err = nonseekable_open(inode, file);
	if (err < 0)
		return err;
2491 2492
	pcm = snd_lookup_minor_data(iminor(inode),
				    SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2493
	err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2494 2495
	if (pcm)
		snd_card_unref(pcm->card);
2496
	return err;
2497 2498 2499 2500 2501
}

static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
{
	int err;
Linus Torvalds's avatar
Linus Torvalds committed
2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516
	wait_queue_t wait;

	if (pcm == NULL) {
		err = -ENODEV;
		goto __error1;
	}
	err = snd_card_file_add(pcm->card, file);
	if (err < 0)
		goto __error1;
	if (!try_module_get(pcm->card->module)) {
		err = -EFAULT;
		goto __error2;
	}
	init_waitqueue_entry(&wait, current);
	add_wait_queue(&pcm->open_wait, &wait);
2517
	mutex_lock(&pcm->open_mutex);
Linus Torvalds's avatar
Linus Torvalds committed
2518
	while (1) {
2519
		err = snd_pcm_open_file(file, pcm, stream);
Linus Torvalds's avatar
Linus Torvalds committed
2520 2521 2522 2523 2524 2525 2526 2527 2528 2529
		if (err >= 0)
			break;
		if (err == -EAGAIN) {
			if (file->f_flags & O_NONBLOCK) {
				err = -EBUSY;
				break;
			}
		} else
			break;
		set_current_state(TASK_INTERRUPTIBLE);
2530
		mutex_unlock(&pcm->open_mutex);
Linus Torvalds's avatar
Linus Torvalds committed
2531
		schedule();
2532
		mutex_lock(&pcm->open_mutex);
2533 2534 2535 2536
		if (pcm->card->shutdown) {
			err = -ENODEV;
			break;
		}
Linus Torvalds's avatar
Linus Torvalds committed
2537 2538 2539 2540 2541 2542
		if (signal_pending(current)) {
			err = -ERESTARTSYS;
			break;
		}
	}
	remove_wait_queue(&pcm->open_wait, &wait);
2543
	mutex_unlock(&pcm->open_mutex);
Linus Torvalds's avatar
Linus Torvalds committed
2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557
	if (err < 0)
		goto __error;
	return err;

      __error:
	module_put(pcm->card->module);
      __error2:
      	snd_card_file_remove(pcm->card, file);
      __error1:
      	return err;
}

static int snd_pcm_release(struct inode *inode, struct file *file)
{
2558 2559 2560
	struct snd_pcm *pcm;
	struct snd_pcm_substream *substream;
	struct snd_pcm_file *pcm_file;
Linus Torvalds's avatar
Linus Torvalds committed
2561 2562 2563

	pcm_file = file->private_data;
	substream = pcm_file->substream;
2564 2565
	if (snd_BUG_ON(!substream))
		return -ENXIO;
Linus Torvalds's avatar
Linus Torvalds committed
2566
	pcm = substream->pcm;
2567
	mutex_lock(&pcm->open_mutex);
2568
	snd_pcm_release_substream(substream);
2569
	kfree(pcm_file);
2570
	mutex_unlock(&pcm->open_mutex);
Linus Torvalds's avatar
Linus Torvalds committed
2571 2572 2573 2574 2575 2576
	wake_up(&pcm->open_wait);
	module_put(pcm->card->module);
	snd_card_file_remove(pcm->card, file);
	return 0;
}

2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600
/* check and update PCM state; return 0 or a negative error
 * call this inside PCM lock
 */
static int do_pcm_hwsync(struct snd_pcm_substream *substream)
{
	switch (substream->runtime->status->state) {
	case SNDRV_PCM_STATE_DRAINING:
		if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
			return -EBADFD;
		/* Fall through */
	case SNDRV_PCM_STATE_RUNNING:
		return snd_pcm_update_hw_ptr(substream);
	case SNDRV_PCM_STATE_PREPARED:
	case SNDRV_PCM_STATE_PAUSED:
		return 0;
	case SNDRV_PCM_STATE_SUSPENDED:
		return -ESTRPIPE;
	case SNDRV_PCM_STATE_XRUN:
		return -EPIPE;
	default:
		return -EBADFD;
	}
}

2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622
/* update to the given appl_ptr and call ack callback if needed;
 * when an error is returned, take back to the original value
 */
static int apply_appl_ptr(struct snd_pcm_substream *substream,
			  snd_pcm_uframes_t appl_ptr)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	snd_pcm_uframes_t old_appl_ptr = runtime->control->appl_ptr;
	int ret;

	runtime->control->appl_ptr = appl_ptr;
	if (substream->ops->ack) {
		ret = substream->ops->ack(substream);
		if (ret < 0) {
			runtime->control->appl_ptr = old_appl_ptr;
			return ret;
		}
	}
	return 0;
}

/* increase the appl_ptr; returns the processed frames or a negative error */
2623 2624 2625 2626 2627 2628
static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream,
					  snd_pcm_uframes_t frames,
					   snd_pcm_sframes_t avail)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	snd_pcm_sframes_t appl_ptr;
2629
	int ret;
2630 2631 2632 2633 2634 2635 2636 2637

	if (avail <= 0)
		return 0;
	if (frames > (snd_pcm_uframes_t)avail)
		frames = avail;
	appl_ptr = runtime->control->appl_ptr + frames;
	if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
		appl_ptr -= runtime->boundary;
2638 2639
	ret = apply_appl_ptr(substream, appl_ptr);
	return ret < 0 ? ret : frames;
2640 2641
}

2642
/* decrease the appl_ptr; returns the processed frames or a negative error */
2643 2644 2645 2646 2647 2648
static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream,
					 snd_pcm_uframes_t frames,
					 snd_pcm_sframes_t avail)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	snd_pcm_sframes_t appl_ptr;
2649
	int ret;
2650 2651 2652 2653 2654 2655 2656 2657

	if (avail <= 0)
		return 0;
	if (frames > (snd_pcm_uframes_t)avail)
		frames = avail;
	appl_ptr = runtime->control->appl_ptr - frames;
	if (appl_ptr < 0)
		appl_ptr += runtime->boundary;
2658 2659
	ret = apply_appl_ptr(substream, appl_ptr);
	return ret < 0 ? ret : frames;
2660 2661
}

2662 2663
static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
						 snd_pcm_uframes_t frames)
Linus Torvalds's avatar
Linus Torvalds committed
2664
{
2665
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
2666 2667 2668 2669 2670 2671
	snd_pcm_sframes_t ret;

	if (frames == 0)
		return 0;

	snd_pcm_stream_lock_irq(substream);
2672
	ret = do_pcm_hwsync(substream);
2673 2674 2675
	if (!ret)
		ret = rewind_appl_ptr(substream, frames,
				      snd_pcm_playback_hw_avail(runtime));
Linus Torvalds's avatar
Linus Torvalds committed
2676 2677 2678 2679
	snd_pcm_stream_unlock_irq(substream);
	return ret;
}

2680 2681
static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
						snd_pcm_uframes_t frames)
Linus Torvalds's avatar
Linus Torvalds committed
2682
{
2683
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
2684 2685 2686 2687 2688 2689
	snd_pcm_sframes_t ret;

	if (frames == 0)
		return 0;

	snd_pcm_stream_lock_irq(substream);
2690
	ret = do_pcm_hwsync(substream);
2691 2692 2693
	if (!ret)
		ret = rewind_appl_ptr(substream, frames,
				      snd_pcm_capture_hw_avail(runtime));
Linus Torvalds's avatar
Linus Torvalds committed
2694 2695 2696 2697
	snd_pcm_stream_unlock_irq(substream);
	return ret;
}

2698 2699
static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
						  snd_pcm_uframes_t frames)
Linus Torvalds's avatar
Linus Torvalds committed
2700
{
2701
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
2702 2703 2704 2705 2706 2707
	snd_pcm_sframes_t ret;

	if (frames == 0)
		return 0;

	snd_pcm_stream_lock_irq(substream);
2708
	ret = do_pcm_hwsync(substream);
2709 2710 2711
	if (!ret)
		ret = forward_appl_ptr(substream, frames,
				       snd_pcm_playback_avail(runtime));
Linus Torvalds's avatar
Linus Torvalds committed
2712 2713 2714 2715
	snd_pcm_stream_unlock_irq(substream);
	return ret;
}

2716 2717
static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
						 snd_pcm_uframes_t frames)
Linus Torvalds's avatar
Linus Torvalds committed
2718
{
2719
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
2720 2721 2722 2723 2724 2725
	snd_pcm_sframes_t ret;

	if (frames == 0)
		return 0;

	snd_pcm_stream_lock_irq(substream);
2726
	ret = do_pcm_hwsync(substream);
2727 2728 2729
	if (!ret)
		ret = forward_appl_ptr(substream, frames,
				       snd_pcm_capture_avail(runtime));
Linus Torvalds's avatar
Linus Torvalds committed
2730 2731 2732 2733
	snd_pcm_stream_unlock_irq(substream);
	return ret;
}

2734
static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
Linus Torvalds's avatar
Linus Torvalds committed
2735 2736 2737 2738
{
	int err;

	snd_pcm_stream_lock_irq(substream);
2739
	err = do_pcm_hwsync(substream);
Linus Torvalds's avatar
Linus Torvalds committed
2740 2741 2742 2743
	snd_pcm_stream_unlock_irq(substream);
	return err;
}
		
2744
static snd_pcm_sframes_t snd_pcm_delay(struct snd_pcm_substream *substream)
Linus Torvalds's avatar
Linus Torvalds committed
2745
{
2746
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
2747 2748 2749 2750
	int err;
	snd_pcm_sframes_t n = 0;

	snd_pcm_stream_lock_irq(substream);
2751 2752
	err = do_pcm_hwsync(substream);
	if (!err) {
Linus Torvalds's avatar
Linus Torvalds committed
2753 2754 2755 2756
		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
			n = snd_pcm_playback_hw_avail(runtime);
		else
			n = snd_pcm_capture_avail(runtime);
2757
		n += runtime->delay;
Linus Torvalds's avatar
Linus Torvalds committed
2758 2759
	}
	snd_pcm_stream_unlock_irq(substream);
2760
	return err < 0 ? err : n;
Linus Torvalds's avatar
Linus Torvalds committed
2761 2762
}
		
2763 2764
static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
			    struct snd_pcm_sync_ptr __user *_sync_ptr)
Linus Torvalds's avatar
Linus Torvalds committed
2765
{
2766 2767 2768 2769
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_pcm_sync_ptr sync_ptr;
	volatile struct snd_pcm_mmap_status *status;
	volatile struct snd_pcm_mmap_control *control;
Linus Torvalds's avatar
Linus Torvalds committed
2770 2771 2772 2773 2774
	int err;

	memset(&sync_ptr, 0, sizeof(sync_ptr));
	if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
		return -EFAULT;
2775
	if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
Linus Torvalds's avatar
Linus Torvalds committed
2776 2777 2778 2779 2780 2781 2782 2783 2784
		return -EFAULT;	
	status = runtime->status;
	control = runtime->control;
	if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
		err = snd_pcm_hwsync(substream);
		if (err < 0)
			return err;
	}
	snd_pcm_stream_lock_irq(substream);
2785 2786 2787 2788 2789 2790 2791
	if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
		err = apply_appl_ptr(substream, sync_ptr.c.control.appl_ptr);
		if (err < 0) {
			snd_pcm_stream_unlock_irq(substream);
			return err;
		}
	} else {
Linus Torvalds's avatar
Linus Torvalds committed
2792
		sync_ptr.c.control.appl_ptr = control->appl_ptr;
2793
	}
Linus Torvalds's avatar
Linus Torvalds committed
2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806
	if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
		control->avail_min = sync_ptr.c.control.avail_min;
	else
		sync_ptr.c.control.avail_min = control->avail_min;
	sync_ptr.s.status.state = status->state;
	sync_ptr.s.status.hw_ptr = status->hw_ptr;
	sync_ptr.s.status.tstamp = status->tstamp;
	sync_ptr.s.status.suspended_state = status->suspended_state;
	snd_pcm_stream_unlock_irq(substream);
	if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
		return -EFAULT;
	return 0;
}
2807 2808 2809 2810 2811 2812 2813 2814 2815 2816

static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	int arg;
	
	if (get_user(arg, _arg))
		return -EFAULT;
	if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
		return -EINVAL;
2817
	runtime->tstamp_type = arg;
2818 2819
	return 0;
}
Linus Torvalds's avatar
Linus Torvalds committed
2820
		
2821 2822
static int snd_pcm_common_ioctl1(struct file *file,
				 struct snd_pcm_substream *substream,
Linus Torvalds's avatar
Linus Torvalds committed
2823 2824 2825 2826 2827 2828 2829
				 unsigned int cmd, void __user *arg)
{
	switch (cmd) {
	case SNDRV_PCM_IOCTL_PVERSION:
		return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
	case SNDRV_PCM_IOCTL_INFO:
		return snd_pcm_info_user(substream, arg);
2830 2831
	case SNDRV_PCM_IOCTL_TSTAMP:	/* just for compatibility */
		return 0;
2832 2833
	case SNDRV_PCM_IOCTL_TTSTAMP:
		return snd_pcm_tstamp(substream, arg);
Linus Torvalds's avatar
Linus Torvalds committed
2834 2835 2836 2837 2838 2839 2840 2841 2842
	case SNDRV_PCM_IOCTL_HW_REFINE:
		return snd_pcm_hw_refine_user(substream, arg);
	case SNDRV_PCM_IOCTL_HW_PARAMS:
		return snd_pcm_hw_params_user(substream, arg);
	case SNDRV_PCM_IOCTL_HW_FREE:
		return snd_pcm_hw_free(substream);
	case SNDRV_PCM_IOCTL_SW_PARAMS:
		return snd_pcm_sw_params_user(substream, arg);
	case SNDRV_PCM_IOCTL_STATUS:
2843 2844 2845
		return snd_pcm_status_user(substream, arg, false);
	case SNDRV_PCM_IOCTL_STATUS_EXT:
		return snd_pcm_status_user(substream, arg, true);
Linus Torvalds's avatar
Linus Torvalds committed
2846 2847 2848
	case SNDRV_PCM_IOCTL_CHANNEL_INFO:
		return snd_pcm_channel_info_user(substream, arg);
	case SNDRV_PCM_IOCTL_PREPARE:
2849
		return snd_pcm_prepare(substream, file);
Linus Torvalds's avatar
Linus Torvalds committed
2850 2851 2852
	case SNDRV_PCM_IOCTL_RESET:
		return snd_pcm_reset(substream);
	case SNDRV_PCM_IOCTL_START:
2853
		return snd_pcm_start_lock_irq(substream);
Linus Torvalds's avatar
Linus Torvalds committed
2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864
	case SNDRV_PCM_IOCTL_LINK:
		return snd_pcm_link(substream, (int)(unsigned long) arg);
	case SNDRV_PCM_IOCTL_UNLINK:
		return snd_pcm_unlink(substream);
	case SNDRV_PCM_IOCTL_RESUME:
		return snd_pcm_resume(substream);
	case SNDRV_PCM_IOCTL_XRUN:
		return snd_pcm_xrun(substream);
	case SNDRV_PCM_IOCTL_HWSYNC:
		return snd_pcm_hwsync(substream);
	case SNDRV_PCM_IOCTL_DELAY:
2865 2866 2867 2868 2869 2870 2871 2872 2873 2874
	{
		snd_pcm_sframes_t delay = snd_pcm_delay(substream);
		snd_pcm_sframes_t __user *res = arg;

		if (delay < 0)
			return delay;
		if (put_user(delay, res))
			return -EFAULT;
		return 0;
	}
Linus Torvalds's avatar
Linus Torvalds committed
2875 2876
	case SNDRV_PCM_IOCTL_SYNC_PTR:
		return snd_pcm_sync_ptr(substream, arg);
2877
#ifdef CONFIG_SND_SUPPORT_OLD_API
Linus Torvalds's avatar
Linus Torvalds committed
2878 2879 2880 2881
	case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
		return snd_pcm_hw_refine_old_user(substream, arg);
	case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
		return snd_pcm_hw_params_old_user(substream, arg);
2882
#endif
Linus Torvalds's avatar
Linus Torvalds committed
2883
	case SNDRV_PCM_IOCTL_DRAIN:
2884
		return snd_pcm_drain(substream, file);
Linus Torvalds's avatar
Linus Torvalds committed
2885 2886
	case SNDRV_PCM_IOCTL_DROP:
		return snd_pcm_drop(substream);
2887 2888 2889 2890 2891 2892 2893 2894
	case SNDRV_PCM_IOCTL_PAUSE:
	{
		int res;
		snd_pcm_stream_lock_irq(substream);
		res = snd_pcm_pause(substream, (int)(unsigned long)arg);
		snd_pcm_stream_unlock_irq(substream);
		return res;
	}
Linus Torvalds's avatar
Linus Torvalds committed
2895
	}
2896
	pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
Linus Torvalds's avatar
Linus Torvalds committed
2897 2898 2899
	return -ENOTTY;
}

2900 2901
static int snd_pcm_playback_ioctl1(struct file *file,
				   struct snd_pcm_substream *substream,
Linus Torvalds's avatar
Linus Torvalds committed
2902 2903
				   unsigned int cmd, void __user *arg)
{
2904 2905 2906 2907
	if (snd_BUG_ON(!substream))
		return -ENXIO;
	if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
		return -EINVAL;
Linus Torvalds's avatar
Linus Torvalds committed
2908 2909 2910
	switch (cmd) {
	case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
	{
2911 2912 2913
		struct snd_xferi xferi;
		struct snd_xferi __user *_xferi = arg;
		struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926
		snd_pcm_sframes_t result;
		if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
			return -EBADFD;
		if (put_user(0, &_xferi->result))
			return -EFAULT;
		if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
			return -EFAULT;
		result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
		__put_user(result, &_xferi->result);
		return result < 0 ? result : 0;
	}
	case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
	{
2927 2928 2929
		struct snd_xfern xfern;
		struct snd_xfern __user *_xfern = arg;
		struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
2930 2931 2932 2933 2934 2935 2936 2937 2938 2939
		void __user **bufs;
		snd_pcm_sframes_t result;
		if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
			return -EBADFD;
		if (runtime->channels > 128)
			return -EINVAL;
		if (put_user(0, &_xfern->result))
			return -EFAULT;
		if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
			return -EFAULT;
2940 2941 2942 2943 2944

		bufs = memdup_user(xfern.bufs,
				   sizeof(void *) * runtime->channels);
		if (IS_ERR(bufs))
			return PTR_ERR(bufs);
Linus Torvalds's avatar
Linus Torvalds committed
2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976
		result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
		kfree(bufs);
		__put_user(result, &_xfern->result);
		return result < 0 ? result : 0;
	}
	case SNDRV_PCM_IOCTL_REWIND:
	{
		snd_pcm_uframes_t frames;
		snd_pcm_uframes_t __user *_frames = arg;
		snd_pcm_sframes_t result;
		if (get_user(frames, _frames))
			return -EFAULT;
		if (put_user(0, _frames))
			return -EFAULT;
		result = snd_pcm_playback_rewind(substream, frames);
		__put_user(result, _frames);
		return result < 0 ? result : 0;
	}
	case SNDRV_PCM_IOCTL_FORWARD:
	{
		snd_pcm_uframes_t frames;
		snd_pcm_uframes_t __user *_frames = arg;
		snd_pcm_sframes_t result;
		if (get_user(frames, _frames))
			return -EFAULT;
		if (put_user(0, _frames))
			return -EFAULT;
		result = snd_pcm_playback_forward(substream, frames);
		__put_user(result, _frames);
		return result < 0 ? result : 0;
	}
	}
2977
	return snd_pcm_common_ioctl1(file, substream, cmd, arg);
Linus Torvalds's avatar
Linus Torvalds committed
2978 2979
}

2980 2981
static int snd_pcm_capture_ioctl1(struct file *file,
				  struct snd_pcm_substream *substream,
Linus Torvalds's avatar
Linus Torvalds committed
2982 2983
				  unsigned int cmd, void __user *arg)
{
2984 2985 2986 2987
	if (snd_BUG_ON(!substream))
		return -ENXIO;
	if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
		return -EINVAL;
Linus Torvalds's avatar
Linus Torvalds committed
2988 2989 2990
	switch (cmd) {
	case SNDRV_PCM_IOCTL_READI_FRAMES:
	{
2991 2992 2993
		struct snd_xferi xferi;
		struct snd_xferi __user *_xferi = arg;
		struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006
		snd_pcm_sframes_t result;
		if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
			return -EBADFD;
		if (put_user(0, &_xferi->result))
			return -EFAULT;
		if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
			return -EFAULT;
		result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
		__put_user(result, &_xferi->result);
		return result < 0 ? result : 0;
	}
	case SNDRV_PCM_IOCTL_READN_FRAMES:
	{
3007 3008 3009
		struct snd_xfern xfern;
		struct snd_xfern __user *_xfern = arg;
		struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
3010 3011 3012 3013 3014 3015 3016 3017 3018 3019
		void *bufs;
		snd_pcm_sframes_t result;
		if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
			return -EBADFD;
		if (runtime->channels > 128)
			return -EINVAL;
		if (put_user(0, &_xfern->result))
			return -EFAULT;
		if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
			return -EFAULT;
3020 3021 3022 3023 3024

		bufs = memdup_user(xfern.bufs,
				   sizeof(void *) * runtime->channels);
		if (IS_ERR(bufs))
			return PTR_ERR(bufs);
Linus Torvalds's avatar
Linus Torvalds committed
3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056
		result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
		kfree(bufs);
		__put_user(result, &_xfern->result);
		return result < 0 ? result : 0;
	}
	case SNDRV_PCM_IOCTL_REWIND:
	{
		snd_pcm_uframes_t frames;
		snd_pcm_uframes_t __user *_frames = arg;
		snd_pcm_sframes_t result;
		if (get_user(frames, _frames))
			return -EFAULT;
		if (put_user(0, _frames))
			return -EFAULT;
		result = snd_pcm_capture_rewind(substream, frames);
		__put_user(result, _frames);
		return result < 0 ? result : 0;
	}
	case SNDRV_PCM_IOCTL_FORWARD:
	{
		snd_pcm_uframes_t frames;
		snd_pcm_uframes_t __user *_frames = arg;
		snd_pcm_sframes_t result;
		if (get_user(frames, _frames))
			return -EFAULT;
		if (put_user(0, _frames))
			return -EFAULT;
		result = snd_pcm_capture_forward(substream, frames);
		__put_user(result, _frames);
		return result < 0 ? result : 0;
	}
	}
3057
	return snd_pcm_common_ioctl1(file, substream, cmd, arg);
Linus Torvalds's avatar
Linus Torvalds committed
3058 3059
}

3060 3061
static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
				   unsigned long arg)
Linus Torvalds's avatar
Linus Torvalds committed
3062
{
3063
	struct snd_pcm_file *pcm_file;
Linus Torvalds's avatar
Linus Torvalds committed
3064 3065 3066 3067 3068 3069

	pcm_file = file->private_data;

	if (((cmd >> 8) & 0xff) != 'A')
		return -ENOTTY;

3070 3071
	return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
				       (void __user *)arg);
Linus Torvalds's avatar
Linus Torvalds committed
3072 3073
}

3074 3075
static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
				  unsigned long arg)
Linus Torvalds's avatar
Linus Torvalds committed
3076
{
3077
	struct snd_pcm_file *pcm_file;
Linus Torvalds's avatar
Linus Torvalds committed
3078 3079 3080 3081 3082 3083

	pcm_file = file->private_data;

	if (((cmd >> 8) & 0xff) != 'A')
		return -ENOTTY;

3084 3085
	return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
				      (void __user *)arg);
Linus Torvalds's avatar
Linus Torvalds committed
3086 3087
}

3088 3089 3090 3091 3092 3093 3094 3095 3096 3097
/**
 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space
 * @substream: PCM substream
 * @cmd: IOCTL cmd
 * @arg: IOCTL argument
 *
 * The function is provided primarily for OSS layer and USB gadget drivers,
 * and it allows only the limited set of ioctls (hw_params, sw_params,
 * prepare, start, drain, drop, forward).
 */
3098 3099
int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
			 unsigned int cmd, void *arg)
Linus Torvalds's avatar
Linus Torvalds committed
3100
{
3101 3102
	snd_pcm_uframes_t *frames = arg;
	snd_pcm_sframes_t result;
Linus Torvalds's avatar
Linus Torvalds committed
3103
	
3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132
	switch (cmd) {
	case SNDRV_PCM_IOCTL_FORWARD:
	{
		/* provided only for OSS; capture-only and no value returned */
		if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
			return -EINVAL;
		result = snd_pcm_capture_forward(substream, *frames);
		return result < 0 ? result : 0;
	}
	case SNDRV_PCM_IOCTL_HW_PARAMS:
		return snd_pcm_hw_params(substream, arg);
	case SNDRV_PCM_IOCTL_SW_PARAMS:
		return snd_pcm_sw_params(substream, arg);
	case SNDRV_PCM_IOCTL_PREPARE:
		return snd_pcm_prepare(substream, NULL);
	case SNDRV_PCM_IOCTL_START:
		return snd_pcm_start_lock_irq(substream);
	case SNDRV_PCM_IOCTL_DRAIN:
		return snd_pcm_drain(substream, NULL);
	case SNDRV_PCM_IOCTL_DROP:
		return snd_pcm_drop(substream);
	case SNDRV_PCM_IOCTL_DELAY:
	{
		result = snd_pcm_delay(substream);
		if (result < 0)
			return result;
		*frames = result;
		return 0;
	}
Linus Torvalds's avatar
Linus Torvalds committed
3133
	default:
3134
		return -EINVAL;
Linus Torvalds's avatar
Linus Torvalds committed
3135 3136
	}
}
3137 3138
EXPORT_SYMBOL(snd_pcm_kernel_ioctl);

3139 3140
static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
			    loff_t * offset)
Linus Torvalds's avatar
Linus Torvalds committed
3141
{
3142 3143 3144
	struct snd_pcm_file *pcm_file;
	struct snd_pcm_substream *substream;
	struct snd_pcm_runtime *runtime;
Linus Torvalds's avatar
Linus Torvalds committed
3145 3146 3147 3148
	snd_pcm_sframes_t result;

	pcm_file = file->private_data;
	substream = pcm_file->substream;
3149 3150
	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
Linus Torvalds's avatar
Linus Torvalds committed
3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162
	runtime = substream->runtime;
	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
		return -EBADFD;
	if (!frame_aligned(runtime, count))
		return -EINVAL;
	count = bytes_to_frames(runtime, count);
	result = snd_pcm_lib_read(substream, buf, count);
	if (result > 0)
		result = frames_to_bytes(runtime, result);
	return result;
}

3163 3164
static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
			     size_t count, loff_t * offset)
Linus Torvalds's avatar
Linus Torvalds committed
3165
{
3166 3167 3168
	struct snd_pcm_file *pcm_file;
	struct snd_pcm_substream *substream;
	struct snd_pcm_runtime *runtime;
Linus Torvalds's avatar
Linus Torvalds committed
3169 3170 3171 3172
	snd_pcm_sframes_t result;

	pcm_file = file->private_data;
	substream = pcm_file->substream;
3173 3174
	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
Linus Torvalds's avatar
Linus Torvalds committed
3175
	runtime = substream->runtime;
3176 3177 3178 3179
	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
		return -EBADFD;
	if (!frame_aligned(runtime, count))
		return -EINVAL;
Linus Torvalds's avatar
Linus Torvalds committed
3180 3181 3182 3183 3184 3185 3186
	count = bytes_to_frames(runtime, count);
	result = snd_pcm_lib_write(substream, buf, count);
	if (result > 0)
		result = frames_to_bytes(runtime, result);
	return result;
}

Al Viro's avatar
Al Viro committed
3187
static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to)
Linus Torvalds's avatar
Linus Torvalds committed
3188
{
3189 3190 3191
	struct snd_pcm_file *pcm_file;
	struct snd_pcm_substream *substream;
	struct snd_pcm_runtime *runtime;
Linus Torvalds's avatar
Linus Torvalds committed
3192 3193 3194 3195 3196
	snd_pcm_sframes_t result;
	unsigned long i;
	void __user **bufs;
	snd_pcm_uframes_t frames;

3197
	pcm_file = iocb->ki_filp->private_data;
Linus Torvalds's avatar
Linus Torvalds committed
3198
	substream = pcm_file->substream;
3199 3200
	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
Linus Torvalds's avatar
Linus Torvalds committed
3201 3202 3203
	runtime = substream->runtime;
	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
		return -EBADFD;
Al Viro's avatar
Al Viro committed
3204 3205 3206
	if (!iter_is_iovec(to))
		return -EINVAL;
	if (to->nr_segs > 1024 || to->nr_segs != runtime->channels)
Linus Torvalds's avatar
Linus Torvalds committed
3207
		return -EINVAL;
Al Viro's avatar
Al Viro committed
3208
	if (!frame_aligned(runtime, to->iov->iov_len))
Linus Torvalds's avatar
Linus Torvalds committed
3209
		return -EINVAL;
Al Viro's avatar
Al Viro committed
3210 3211
	frames = bytes_to_samples(runtime, to->iov->iov_len);
	bufs = kmalloc(sizeof(void *) * to->nr_segs, GFP_KERNEL);
Linus Torvalds's avatar
Linus Torvalds committed
3212 3213
	if (bufs == NULL)
		return -ENOMEM;
Al Viro's avatar
Al Viro committed
3214 3215
	for (i = 0; i < to->nr_segs; ++i)
		bufs[i] = to->iov[i].iov_base;
Linus Torvalds's avatar
Linus Torvalds committed
3216 3217 3218 3219 3220 3221 3222
	result = snd_pcm_lib_readv(substream, bufs, frames);
	if (result > 0)
		result = frames_to_bytes(runtime, result);
	kfree(bufs);
	return result;
}

Al Viro's avatar
Al Viro committed
3223
static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from)
Linus Torvalds's avatar
Linus Torvalds committed
3224
{
3225 3226 3227
	struct snd_pcm_file *pcm_file;
	struct snd_pcm_substream *substream;
	struct snd_pcm_runtime *runtime;
Linus Torvalds's avatar
Linus Torvalds committed
3228 3229 3230 3231 3232
	snd_pcm_sframes_t result;
	unsigned long i;
	void __user **bufs;
	snd_pcm_uframes_t frames;

3233
	pcm_file = iocb->ki_filp->private_data;
Linus Torvalds's avatar
Linus Torvalds committed
3234
	substream = pcm_file->substream;
3235 3236
	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
Linus Torvalds's avatar
Linus Torvalds committed
3237
	runtime = substream->runtime;
3238 3239
	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
		return -EBADFD;
Al Viro's avatar
Al Viro committed
3240 3241 3242 3243
	if (!iter_is_iovec(from))
		return -EINVAL;
	if (from->nr_segs > 128 || from->nr_segs != runtime->channels ||
	    !frame_aligned(runtime, from->iov->iov_len))
3244
		return -EINVAL;
Al Viro's avatar
Al Viro committed
3245 3246
	frames = bytes_to_samples(runtime, from->iov->iov_len);
	bufs = kmalloc(sizeof(void *) * from->nr_segs, GFP_KERNEL);
Linus Torvalds's avatar
Linus Torvalds committed
3247 3248
	if (bufs == NULL)
		return -ENOMEM;
Al Viro's avatar
Al Viro committed
3249 3250
	for (i = 0; i < from->nr_segs; ++i)
		bufs[i] = from->iov[i].iov_base;
Linus Torvalds's avatar
Linus Torvalds committed
3251 3252 3253 3254 3255 3256 3257 3258 3259
	result = snd_pcm_lib_writev(substream, bufs, frames);
	if (result > 0)
		result = frames_to_bytes(runtime, result);
	kfree(bufs);
	return result;
}

static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
{
3260 3261 3262
	struct snd_pcm_file *pcm_file;
	struct snd_pcm_substream *substream;
	struct snd_pcm_runtime *runtime;
Linus Torvalds's avatar
Linus Torvalds committed
3263 3264 3265 3266 3267 3268
        unsigned int mask;
	snd_pcm_uframes_t avail;

	pcm_file = file->private_data;

	substream = pcm_file->substream;
3269
	if (PCM_RUNTIME_CHECK(substream))
3270
		return POLLOUT | POLLWRNORM | POLLERR;
Linus Torvalds's avatar
Linus Torvalds committed
3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298
	runtime = substream->runtime;

	poll_wait(file, &runtime->sleep, wait);

	snd_pcm_stream_lock_irq(substream);
	avail = snd_pcm_playback_avail(runtime);
	switch (runtime->status->state) {
	case SNDRV_PCM_STATE_RUNNING:
	case SNDRV_PCM_STATE_PREPARED:
	case SNDRV_PCM_STATE_PAUSED:
		if (avail >= runtime->control->avail_min) {
			mask = POLLOUT | POLLWRNORM;
			break;
		}
		/* Fall through */
	case SNDRV_PCM_STATE_DRAINING:
		mask = 0;
		break;
	default:
		mask = POLLOUT | POLLWRNORM | POLLERR;
		break;
	}
	snd_pcm_stream_unlock_irq(substream);
	return mask;
}

static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
{
3299 3300 3301
	struct snd_pcm_file *pcm_file;
	struct snd_pcm_substream *substream;
	struct snd_pcm_runtime *runtime;
Linus Torvalds's avatar
Linus Torvalds committed
3302 3303 3304 3305 3306 3307
        unsigned int mask;
	snd_pcm_uframes_t avail;

	pcm_file = file->private_data;

	substream = pcm_file->substream;
3308
	if (PCM_RUNTIME_CHECK(substream))
3309
		return POLLIN | POLLRDNORM | POLLERR;
Linus Torvalds's avatar
Linus Torvalds committed
3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351
	runtime = substream->runtime;

	poll_wait(file, &runtime->sleep, wait);

	snd_pcm_stream_lock_irq(substream);
	avail = snd_pcm_capture_avail(runtime);
	switch (runtime->status->state) {
	case SNDRV_PCM_STATE_RUNNING:
	case SNDRV_PCM_STATE_PREPARED:
	case SNDRV_PCM_STATE_PAUSED:
		if (avail >= runtime->control->avail_min) {
			mask = POLLIN | POLLRDNORM;
			break;
		}
		mask = 0;
		break;
	case SNDRV_PCM_STATE_DRAINING:
		if (avail > 0) {
			mask = POLLIN | POLLRDNORM;
			break;
		}
		/* Fall through */
	default:
		mask = POLLIN | POLLRDNORM | POLLERR;
		break;
	}
	snd_pcm_stream_unlock_irq(substream);
	return mask;
}

/*
 * mmap support
 */

/*
 * Only on coherent architectures, we can mmap the status and the control records
 * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
 */
#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
/*
 * mmap status record
 */
3352
static int snd_pcm_mmap_status_fault(struct vm_fault *vmf)
Linus Torvalds's avatar
Linus Torvalds committed
3353
{
3354
	struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3355
	struct snd_pcm_runtime *runtime;
Linus Torvalds's avatar
Linus Torvalds committed
3356 3357
	
	if (substream == NULL)
Nick Piggin's avatar
Nick Piggin committed
3358
		return VM_FAULT_SIGBUS;
Linus Torvalds's avatar
Linus Torvalds committed
3359
	runtime = substream->runtime;
Nick Piggin's avatar
Nick Piggin committed
3360 3361 3362
	vmf->page = virt_to_page(runtime->status);
	get_page(vmf->page);
	return 0;
Linus Torvalds's avatar
Linus Torvalds committed
3363 3364
}

3365
static const struct vm_operations_struct snd_pcm_vm_ops_status =
Linus Torvalds's avatar
Linus Torvalds committed
3366
{
Nick Piggin's avatar
Nick Piggin committed
3367
	.fault =	snd_pcm_mmap_status_fault,
Linus Torvalds's avatar
Linus Torvalds committed
3368 3369
};

3370
static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
Linus Torvalds's avatar
Linus Torvalds committed
3371 3372 3373 3374 3375 3376
			       struct vm_area_struct *area)
{
	long size;
	if (!(area->vm_flags & VM_READ))
		return -EINVAL;
	size = area->vm_end - area->vm_start;
3377
	if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
Linus Torvalds's avatar
Linus Torvalds committed
3378 3379 3380
		return -EINVAL;
	area->vm_ops = &snd_pcm_vm_ops_status;
	area->vm_private_data = substream;
3381
	area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
Linus Torvalds's avatar
Linus Torvalds committed
3382 3383 3384 3385 3386 3387
	return 0;
}

/*
 * mmap control record
 */
3388
static int snd_pcm_mmap_control_fault(struct vm_fault *vmf)
Linus Torvalds's avatar
Linus Torvalds committed
3389
{
3390
	struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3391
	struct snd_pcm_runtime *runtime;
Linus Torvalds's avatar
Linus Torvalds committed
3392 3393
	
	if (substream == NULL)
Nick Piggin's avatar
Nick Piggin committed
3394
		return VM_FAULT_SIGBUS;
Linus Torvalds's avatar
Linus Torvalds committed
3395
	runtime = substream->runtime;
Nick Piggin's avatar
Nick Piggin committed
3396 3397 3398
	vmf->page = virt_to_page(runtime->control);
	get_page(vmf->page);
	return 0;
Linus Torvalds's avatar
Linus Torvalds committed
3399 3400
}

3401
static const struct vm_operations_struct snd_pcm_vm_ops_control =
Linus Torvalds's avatar
Linus Torvalds committed
3402
{
Nick Piggin's avatar
Nick Piggin committed
3403
	.fault =	snd_pcm_mmap_control_fault,
Linus Torvalds's avatar
Linus Torvalds committed
3404 3405
};

3406
static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
Linus Torvalds's avatar
Linus Torvalds committed
3407 3408 3409 3410 3411 3412
				struct vm_area_struct *area)
{
	long size;
	if (!(area->vm_flags & VM_READ))
		return -EINVAL;
	size = area->vm_end - area->vm_start;
3413
	if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
Linus Torvalds's avatar
Linus Torvalds committed
3414 3415 3416
		return -EINVAL;
	area->vm_ops = &snd_pcm_vm_ops_control;
	area->vm_private_data = substream;
3417
	area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
Linus Torvalds's avatar
Linus Torvalds committed
3418 3419 3420 3421 3422 3423
	return 0;
}
#else /* ! coherent mmap */
/*
 * don't support mmap for status and control records.
 */
3424
static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
Linus Torvalds's avatar
Linus Torvalds committed
3425 3426 3427 3428
			       struct vm_area_struct *area)
{
	return -ENXIO;
}
3429
static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
Linus Torvalds's avatar
Linus Torvalds committed
3430 3431 3432 3433 3434 3435
				struct vm_area_struct *area)
{
	return -ENXIO;
}
#endif /* coherent mmap */

3436 3437 3438 3439 3440 3441 3442
static inline struct page *
snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
{
	void *vaddr = substream->runtime->dma_area + ofs;
	return virt_to_page(vaddr);
}

Linus Torvalds's avatar
Linus Torvalds committed
3443
/*
Nick Piggin's avatar
Nick Piggin committed
3444
 * fault callback for mmapping a RAM page
Linus Torvalds's avatar
Linus Torvalds committed
3445
 */
3446
static int snd_pcm_mmap_data_fault(struct vm_fault *vmf)
Linus Torvalds's avatar
Linus Torvalds committed
3447
{
3448
	struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3449
	struct snd_pcm_runtime *runtime;
Linus Torvalds's avatar
Linus Torvalds committed
3450 3451 3452 3453 3454
	unsigned long offset;
	struct page * page;
	size_t dma_bytes;
	
	if (substream == NULL)
Nick Piggin's avatar
Nick Piggin committed
3455
		return VM_FAULT_SIGBUS;
Linus Torvalds's avatar
Linus Torvalds committed
3456
	runtime = substream->runtime;
Nick Piggin's avatar
Nick Piggin committed
3457
	offset = vmf->pgoff << PAGE_SHIFT;
Linus Torvalds's avatar
Linus Torvalds committed
3458 3459
	dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
	if (offset > dma_bytes - PAGE_SIZE)
Nick Piggin's avatar
Nick Piggin committed
3460
		return VM_FAULT_SIGBUS;
3461
	if (substream->ops->page)
Linus Torvalds's avatar
Linus Torvalds committed
3462
		page = substream->ops->page(substream, offset);
3463 3464 3465 3466
	else
		page = snd_pcm_default_page_ops(substream, offset);
	if (!page)
		return VM_FAULT_SIGBUS;
3467
	get_page(page);
Nick Piggin's avatar
Nick Piggin committed
3468 3469
	vmf->page = page;
	return 0;
Linus Torvalds's avatar
Linus Torvalds committed
3470 3471
}

3472 3473 3474 3475 3476 3477
static const struct vm_operations_struct snd_pcm_vm_ops_data = {
	.open =		snd_pcm_mmap_data_open,
	.close =	snd_pcm_mmap_data_close,
};

static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
Linus Torvalds's avatar
Linus Torvalds committed
3478 3479
	.open =		snd_pcm_mmap_data_open,
	.close =	snd_pcm_mmap_data_close,
Nick Piggin's avatar
Nick Piggin committed
3480
	.fault =	snd_pcm_mmap_data_fault,
Linus Torvalds's avatar
Linus Torvalds committed
3481 3482 3483 3484 3485
};

/*
 * mmap the DMA buffer on RAM
 */
3486 3487 3488 3489 3490 3491 3492 3493 3494

/**
 * snd_pcm_lib_default_mmap - Default PCM data mmap function
 * @substream: PCM substream
 * @area: VMA
 *
 * This is the default mmap handler for PCM data.  When mmap pcm_ops is NULL,
 * this function is invoked implicitly.
 */
3495 3496
int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
			     struct vm_area_struct *area)
Linus Torvalds's avatar
Linus Torvalds committed
3497
{
3498
	area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3499
#ifdef CONFIG_GENERIC_ALLOCATOR
3500 3501 3502 3503 3504 3505
	if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) {
		area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
		return remap_pfn_range(area, area->vm_start,
				substream->dma_buffer.addr >> PAGE_SHIFT,
				area->vm_end - area->vm_start, area->vm_page_prot);
	}
3506
#endif /* CONFIG_GENERIC_ALLOCATOR */
3507
#ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */
3508 3509 3510 3511 3512 3513 3514
	if (!substream->ops->page &&
	    substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
		return dma_mmap_coherent(substream->dma_buffer.dev.dev,
					 area,
					 substream->runtime->dma_area,
					 substream->runtime->dma_addr,
					 area->vm_end - area->vm_start);
3515
#endif /* CONFIG_X86 */
3516 3517
	/* mmap with fault handler */
	area->vm_ops = &snd_pcm_vm_ops_data_fault;
Linus Torvalds's avatar
Linus Torvalds committed
3518 3519
	return 0;
}
3520
EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
Linus Torvalds's avatar
Linus Torvalds committed
3521 3522 3523 3524 3525

/*
 * mmap the DMA buffer on I/O memory area
 */
#if SNDRV_PCM_INFO_MMAP_IOMEM
3526 3527 3528 3529 3530 3531 3532 3533 3534
/**
 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem
 * @substream: PCM substream
 * @area: VMA
 *
 * When your hardware uses the iomapped pages as the hardware buffer and
 * wants to mmap it, pass this function as mmap pcm_ops.  Note that this
 * is supposed to work only on limited architectures.
 */
3535 3536
int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
			   struct vm_area_struct *area)
Linus Torvalds's avatar
Linus Torvalds committed
3537
{
3538
	struct snd_pcm_runtime *runtime = substream->runtime;;
Linus Torvalds's avatar
Linus Torvalds committed
3539 3540

	area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3541
	return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
Linus Torvalds's avatar
Linus Torvalds committed
3542
}
3543 3544

EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
Linus Torvalds's avatar
Linus Torvalds committed
3545 3546 3547 3548 3549
#endif /* SNDRV_PCM_INFO_MMAP */

/*
 * mmap DMA buffer
 */
3550
int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
Linus Torvalds's avatar
Linus Torvalds committed
3551 3552
		      struct vm_area_struct *area)
{
3553
	struct snd_pcm_runtime *runtime;
Linus Torvalds's avatar
Linus Torvalds committed
3554 3555 3556
	long size;
	unsigned long offset;
	size_t dma_bytes;
3557
	int err;
Linus Torvalds's avatar
Linus Torvalds committed
3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579 3580 3581

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		if (!(area->vm_flags & (VM_WRITE|VM_READ)))
			return -EINVAL;
	} else {
		if (!(area->vm_flags & VM_READ))
			return -EINVAL;
	}
	runtime = substream->runtime;
	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
		return -EBADFD;
	if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
		return -ENXIO;
	if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
	    runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
		return -EINVAL;
	size = area->vm_end - area->vm_start;
	offset = area->vm_pgoff << PAGE_SHIFT;
	dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
	if ((size_t)size > dma_bytes)
		return -EINVAL;
	if (offset > dma_bytes - size)
		return -EINVAL;

3582 3583
	area->vm_ops = &snd_pcm_vm_ops_data;
	area->vm_private_data = substream;
Linus Torvalds's avatar
Linus Torvalds committed
3584
	if (substream->ops->mmap)
3585
		err = substream->ops->mmap(substream, area);
Linus Torvalds's avatar
Linus Torvalds committed
3586
	else
3587
		err = snd_pcm_lib_default_mmap(substream, area);
3588 3589 3590
	if (!err)
		atomic_inc(&substream->mmap_count);
	return err;
Linus Torvalds's avatar
Linus Torvalds committed
3591 3592
}

3593 3594
EXPORT_SYMBOL(snd_pcm_mmap_data);

Linus Torvalds's avatar
Linus Torvalds committed
3595 3596
static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
{
3597 3598
	struct snd_pcm_file * pcm_file;
	struct snd_pcm_substream *substream;	
Linus Torvalds's avatar
Linus Torvalds committed
3599 3600 3601 3602
	unsigned long offset;
	
	pcm_file = file->private_data;
	substream = pcm_file->substream;
3603 3604
	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
Linus Torvalds's avatar
Linus Torvalds committed
3605 3606 3607 3608

	offset = area->vm_pgoff << PAGE_SHIFT;
	switch (offset) {
	case SNDRV_PCM_MMAP_OFFSET_STATUS:
3609
		if (pcm_file->no_compat_mmap)
Linus Torvalds's avatar
Linus Torvalds committed
3610 3611 3612
			return -ENXIO;
		return snd_pcm_mmap_status(substream, file, area);
	case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3613
		if (pcm_file->no_compat_mmap)
Linus Torvalds's avatar
Linus Torvalds committed
3614 3615 3616 3617 3618 3619 3620 3621 3622 3623
			return -ENXIO;
		return snd_pcm_mmap_control(substream, file, area);
	default:
		return snd_pcm_mmap_data(substream, file, area);
	}
	return 0;
}

static int snd_pcm_fasync(int fd, struct file * file, int on)
{
3624 3625 3626
	struct snd_pcm_file * pcm_file;
	struct snd_pcm_substream *substream;
	struct snd_pcm_runtime *runtime;
Linus Torvalds's avatar
Linus Torvalds committed
3627 3628 3629

	pcm_file = file->private_data;
	substream = pcm_file->substream;
3630
	if (PCM_RUNTIME_CHECK(substream))
3631
		return -ENXIO;
Linus Torvalds's avatar
Linus Torvalds committed
3632
	runtime = substream->runtime;
3633
	return fasync_helper(fd, file, on, &runtime->fasync);
Linus Torvalds's avatar
Linus Torvalds committed
3634 3635 3636 3637 3638 3639 3640 3641 3642 3643 3644 3645 3646 3647 3648
}

/*
 * ioctl32 compat
 */
#ifdef CONFIG_COMPAT
#include "pcm_compat.c"
#else
#define snd_pcm_ioctl_compat	NULL
#endif

/*
 *  To be removed helpers to keep binary compatibility
 */

3649
#ifdef CONFIG_SND_SUPPORT_OLD_API
Linus Torvalds's avatar
Linus Torvalds committed
3650 3651 3652
#define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
#define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))

3653 3654
static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
					       struct snd_pcm_hw_params_old *oparams)
Linus Torvalds's avatar
Linus Torvalds committed
3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 3665 3666 3667 3668 3669 3670 3671
{
	unsigned int i;

	memset(params, 0, sizeof(*params));
	params->flags = oparams->flags;
	for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
		params->masks[i].bits[0] = oparams->masks[i];
	memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
	params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
	params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
	params->info = oparams->info;
	params->msbits = oparams->msbits;
	params->rate_num = oparams->rate_num;
	params->rate_den = oparams->rate_den;
	params->fifo_size = oparams->fifo_size;
}

3672 3673
static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
					     struct snd_pcm_hw_params *params)
Linus Torvalds's avatar
Linus Torvalds committed
3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684 3685 3686 3687 3688 3689 3690
{
	unsigned int i;

	memset(oparams, 0, sizeof(*oparams));
	oparams->flags = params->flags;
	for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
		oparams->masks[i] = params->masks[i].bits[0];
	memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
	oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
	oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
	oparams->info = params->info;
	oparams->msbits = params->msbits;
	oparams->rate_num = params->rate_num;
	oparams->rate_den = params->rate_den;
	oparams->fifo_size = params->fifo_size;
}

3691 3692
static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
				      struct snd_pcm_hw_params_old __user * _oparams)
Linus Torvalds's avatar
Linus Torvalds committed
3693
{
3694 3695
	struct snd_pcm_hw_params *params;
	struct snd_pcm_hw_params_old *oparams = NULL;
Linus Torvalds's avatar
Linus Torvalds committed
3696 3697 3698
	int err;

	params = kmalloc(sizeof(*params), GFP_KERNEL);
3699 3700
	if (!params)
		return -ENOMEM;
Linus Torvalds's avatar
Linus Torvalds committed
3701

3702 3703 3704
	oparams = memdup_user(_oparams, sizeof(*oparams));
	if (IS_ERR(oparams)) {
		err = PTR_ERR(oparams);
Linus Torvalds's avatar
Linus Torvalds committed
3705 3706 3707 3708
		goto out;
	}
	snd_pcm_hw_convert_from_old_params(params, oparams);
	err = snd_pcm_hw_refine(substream, params);
3709 3710 3711 3712 3713 3714
	if (err < 0)
		goto out_old;

	err = fixup_unreferenced_params(substream, params);
	if (err < 0)
		goto out_old;
3715

3716 3717 3718 3719
	snd_pcm_hw_convert_to_old_params(oparams, params);
	if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
		err = -EFAULT;
out_old:
3720
	kfree(oparams);
Linus Torvalds's avatar
Linus Torvalds committed
3721 3722 3723 3724 3725
out:
	kfree(params);
	return err;
}

3726 3727
static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
				      struct snd_pcm_hw_params_old __user * _oparams)
Linus Torvalds's avatar
Linus Torvalds committed
3728
{
3729 3730
	struct snd_pcm_hw_params *params;
	struct snd_pcm_hw_params_old *oparams = NULL;
Linus Torvalds's avatar
Linus Torvalds committed
3731 3732 3733
	int err;

	params = kmalloc(sizeof(*params), GFP_KERNEL);
3734 3735 3736 3737 3738 3739
	if (!params)
		return -ENOMEM;

	oparams = memdup_user(_oparams, sizeof(*oparams));
	if (IS_ERR(oparams)) {
		err = PTR_ERR(oparams);
Linus Torvalds's avatar
Linus Torvalds committed
3740 3741
		goto out;
	}
3742

Linus Torvalds's avatar
Linus Torvalds committed
3743 3744
	snd_pcm_hw_convert_from_old_params(params, oparams);
	err = snd_pcm_hw_params(substream, params);
3745 3746
	if (err < 0)
		goto out_old;
3747

3748 3749 3750 3751
	snd_pcm_hw_convert_to_old_params(oparams, params);
	if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
		err = -EFAULT;
out_old:
3752
	kfree(oparams);
Linus Torvalds's avatar
Linus Torvalds committed
3753 3754 3755 3756
out:
	kfree(params);
	return err;
}
3757
#endif /* CONFIG_SND_SUPPORT_OLD_API */
Linus Torvalds's avatar
Linus Torvalds committed
3758

3759
#ifndef CONFIG_MMU
3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778
static unsigned long snd_pcm_get_unmapped_area(struct file *file,
					       unsigned long addr,
					       unsigned long len,
					       unsigned long pgoff,
					       unsigned long flags)
{
	struct snd_pcm_file *pcm_file = file->private_data;
	struct snd_pcm_substream *substream = pcm_file->substream;
	struct snd_pcm_runtime *runtime = substream->runtime;
	unsigned long offset = pgoff << PAGE_SHIFT;

	switch (offset) {
	case SNDRV_PCM_MMAP_OFFSET_STATUS:
		return (unsigned long)runtime->status;
	case SNDRV_PCM_MMAP_OFFSET_CONTROL:
		return (unsigned long)runtime->control;
	default:
		return (unsigned long)runtime->dma_area + offset;
	}
3779 3780
}
#else
3781
# define snd_pcm_get_unmapped_area NULL
3782 3783
#endif

Linus Torvalds's avatar
Linus Torvalds committed
3784 3785 3786 3787
/*
 *  Register section
 */

3788
const struct file_operations snd_pcm_f_ops[2] = {
Linus Torvalds's avatar
Linus Torvalds committed
3789
	{
3790 3791
		.owner =		THIS_MODULE,
		.write =		snd_pcm_write,
Al Viro's avatar
Al Viro committed
3792
		.write_iter =		snd_pcm_writev,
3793
		.open =			snd_pcm_playback_open,
3794
		.release =		snd_pcm_release,
3795
		.llseek =		no_llseek,
3796 3797 3798 3799 3800
		.poll =			snd_pcm_playback_poll,
		.unlocked_ioctl =	snd_pcm_playback_ioctl,
		.compat_ioctl = 	snd_pcm_ioctl_compat,
		.mmap =			snd_pcm_mmap,
		.fasync =		snd_pcm_fasync,
3801
		.get_unmapped_area =	snd_pcm_get_unmapped_area,
Linus Torvalds's avatar
Linus Torvalds committed
3802 3803
	},
	{
3804 3805
		.owner =		THIS_MODULE,
		.read =			snd_pcm_read,
Al Viro's avatar
Al Viro committed
3806
		.read_iter =		snd_pcm_readv,
3807
		.open =			snd_pcm_capture_open,
3808
		.release =		snd_pcm_release,
3809
		.llseek =		no_llseek,
3810 3811 3812 3813 3814
		.poll =			snd_pcm_capture_poll,
		.unlocked_ioctl =	snd_pcm_capture_ioctl,
		.compat_ioctl = 	snd_pcm_ioctl_compat,
		.mmap =			snd_pcm_mmap,
		.fasync =		snd_pcm_fasync,
3815
		.get_unmapped_area =	snd_pcm_get_unmapped_area,
Linus Torvalds's avatar
Linus Torvalds committed
3816 3817
	}
};