pcm_native.c 100.9 KB
Newer Older
L
Linus Torvalds 已提交
1 2
/*
 *  Digital Audio (PCM) abstract layer
3
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
L
Linus Torvalds 已提交
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>
L
Linus Torvalds 已提交
24 25 26
#include <linux/file.h>
#include <linux/slab.h>
#include <linux/time.h>
27
#include <linux/pm_qos.h>
28
#include <linux/io.h>
29
#include <linux/dma-mapping.h>
L
Linus Torvalds 已提交
30 31 32 33 34 35 36
#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>
37
#include <linux/uio.h>
L
Linus Torvalds 已提交
38 39 40 41 42

/*
 *  Compatibility
 */

T
Takashi Iwai 已提交
43
struct snd_pcm_hw_params_old {
L
Linus Torvalds 已提交
44 45 46
	unsigned int flags;
	unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
			   SNDRV_PCM_HW_PARAM_ACCESS + 1];
T
Takashi Iwai 已提交
47
	struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
L
Linus Torvalds 已提交
48 49 50 51 52 53 54
					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;
T
Takashi Iwai 已提交
55
	snd_pcm_uframes_t fifo_size;
L
Linus Torvalds 已提交
56 57 58
	unsigned char reserved[64];
};

59
#ifdef CONFIG_SND_SUPPORT_OLD_API
T
Takashi Iwai 已提交
60 61
#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)
L
Linus Torvalds 已提交
62

T
Takashi Iwai 已提交
63 64 65 66
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);
67
#endif
68
static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
L
Linus Torvalds 已提交
69 70 71 72 73

/*
 *
 */

74 75
static DEFINE_RWLOCK(snd_pcm_link_rwlock);
static DECLARE_RWSEM(snd_pcm_link_rwsem);
L
Linus Torvalds 已提交
76

77 78 79 80 81 82 83 84 85 86 87 88
/* 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();
}

T
Takashi Iwai 已提交
89 90 91 92 93 94 95 96
/**
 * 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.
 */
97 98 99
void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
{
	if (substream->pcm->nonatomic) {
100
		down_read_nested(&snd_pcm_link_rwsem, SINGLE_DEPTH_NESTING);
101 102 103 104 105 106 107 108
		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);

T
Takashi Iwai 已提交
109 110 111 112 113 114
/**
 * 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().
 */
115 116 117 118 119 120 121 122 123 124 125 126
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);

T
Takashi Iwai 已提交
127 128 129 130 131 132 133 134
/**
 * 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().
 */
135 136 137 138 139 140 141 142
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);

T
Takashi Iwai 已提交
143 144 145 146 147 148
/**
 * snd_pcm_stream_unlock_irq - Unlock the PCM stream
 * @substream: PCM substream
 *
 * This is a counter-part of snd_pcm_stream_lock_irq().
 */
149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166
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);

T
Takashi Iwai 已提交
167 168 169 170 171 172 173
/**
 * 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().
 */
174 175 176 177 178 179 180 181
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);
L
Linus Torvalds 已提交
182 183 184 185 186 187 188 189 190 191 192 193 194 195 196

static inline mm_segment_t snd_enter_user(void)
{
	mm_segment_t fs = get_fs();
	set_fs(get_ds());
	return fs;
}

static inline void snd_leave_user(mm_segment_t fs)
{
	set_fs(fs);
}



T
Takashi Iwai 已提交
197
int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
L
Linus Torvalds 已提交
198
{
T
Takashi Iwai 已提交
199 200 201
	struct snd_pcm_runtime *runtime;
	struct snd_pcm *pcm = substream->pcm;
	struct snd_pcm_str *pstr = substream->pstr;
L
Linus Torvalds 已提交
202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223

	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;
}

T
Takashi Iwai 已提交
224 225
int snd_pcm_info_user(struct snd_pcm_substream *substream,
		      struct snd_pcm_info __user * _info)
L
Linus Torvalds 已提交
226
{
T
Takashi Iwai 已提交
227
	struct snd_pcm_info *info;
L
Linus Torvalds 已提交
228 229 230 231 232 233 234 235 236 237 238 239 240 241
	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;
}

242 243 244 245 246 247 248 249 250 251 252 253 254 255 256
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;
}

L
Linus Torvalds 已提交
257 258 259 260
#undef RULES_DEBUG

#ifdef RULES_DEBUG
#define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
261
static const char * const snd_pcm_hw_param_names[] = {
L
Linus Torvalds 已提交
262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279
	HW_PARAM(ACCESS),
	HW_PARAM(FORMAT),
	HW_PARAM(SUBFORMAT),
	HW_PARAM(SAMPLE_BITS),
	HW_PARAM(FRAME_BITS),
	HW_PARAM(CHANNELS),
	HW_PARAM(RATE),
	HW_PARAM(PERIOD_TIME),
	HW_PARAM(PERIOD_SIZE),
	HW_PARAM(PERIOD_BYTES),
	HW_PARAM(PERIODS),
	HW_PARAM(BUFFER_TIME),
	HW_PARAM(BUFFER_SIZE),
	HW_PARAM(BUFFER_BYTES),
	HW_PARAM(TICK_TIME),
};
#endif

T
Takashi Iwai 已提交
280 281
int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 
		      struct snd_pcm_hw_params *params)
L
Linus Torvalds 已提交
282 283
{
	unsigned int k;
T
Takashi Iwai 已提交
284 285 286 287
	struct snd_pcm_hardware *hw;
	struct snd_interval *i = NULL;
	struct snd_mask *m = NULL;
	struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
L
Linus Torvalds 已提交
288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308
	unsigned int rstamps[constrs->rules_num];
	unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
	unsigned int stamp = 2;
	int changed, again;

	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;
	}

	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;
		if (!(params->rmask & (1 << k)))
			continue;
#ifdef RULES_DEBUG
309 310
		pr_debug("%s = ", snd_pcm_hw_param_names[k]);
		pr_cont("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
L
Linus Torvalds 已提交
311 312 313
#endif
		changed = snd_mask_refine(m, constrs_mask(constrs, k));
#ifdef RULES_DEBUG
314
		pr_cont("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
L
Linus Torvalds 已提交
315 316 317 318 319 320 321 322 323 324 325 326 327 328
#endif
		if (changed)
			params->cmask |= 1 << k;
		if (changed < 0)
			return 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;
		if (!(params->rmask & (1 << k)))
			continue;
#ifdef RULES_DEBUG
329
		pr_debug("%s = ", snd_pcm_hw_param_names[k]);
L
Linus Torvalds 已提交
330
		if (i->empty)
331
			pr_cont("empty");
L
Linus Torvalds 已提交
332
		else
333
			pr_cont("%c%u %u%c",
L
Linus Torvalds 已提交
334 335
			       i->openmin ? '(' : '[', i->min,
			       i->max, i->openmax ? ')' : ']');
336
		pr_cont(" -> ");
L
Linus Torvalds 已提交
337 338 339 340
#endif
		changed = snd_interval_refine(i, constrs_interval(constrs, k));
#ifdef RULES_DEBUG
		if (i->empty)
341
			pr_cont("empty\n");
L
Linus Torvalds 已提交
342
		else 
343
			pr_cont("%c%u %u%c\n",
L
Linus Torvalds 已提交
344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359
			       i->openmin ? '(' : '[', i->min,
			       i->max, i->openmax ? ')' : ']');
#endif
		if (changed)
			params->cmask |= 1 << k;
		if (changed < 0)
			return changed;
	}

	for (k = 0; k < constrs->rules_num; k++)
		rstamps[k] = 0;
	for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 
		vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
	do {
		again = 0;
		for (k = 0; k < constrs->rules_num; k++) {
T
Takashi Iwai 已提交
360
			struct snd_pcm_hw_rule *r = &constrs->rules[k];
L
Linus Torvalds 已提交
361 362 363 364 365 366 367 368 369 370 371 372 373
			unsigned int d;
			int doit = 0;
			if (r->cond && !(r->cond & params->flags))
				continue;
			for (d = 0; r->deps[d] >= 0; d++) {
				if (vstamps[r->deps[d]] > rstamps[k]) {
					doit = 1;
					break;
				}
			}
			if (!doit)
				continue;
#ifdef RULES_DEBUG
374
			pr_debug("Rule %d [%p]: ", k, r->func);
L
Linus Torvalds 已提交
375
			if (r->var >= 0) {
376
				pr_cont("%s = ", snd_pcm_hw_param_names[r->var]);
L
Linus Torvalds 已提交
377 378
				if (hw_is_mask(r->var)) {
					m = hw_param_mask(params, r->var);
379
					pr_cont("%x", *m->bits);
L
Linus Torvalds 已提交
380 381 382
				} else {
					i = hw_param_interval(params, r->var);
					if (i->empty)
383
						pr_cont("empty");
L
Linus Torvalds 已提交
384
					else
385
						pr_cont("%c%u %u%c",
L
Linus Torvalds 已提交
386 387 388 389 390 391 392 393
						       i->openmin ? '(' : '[', i->min,
						       i->max, i->openmax ? ')' : ']');
				}
			}
#endif
			changed = r->func(params, r);
#ifdef RULES_DEBUG
			if (r->var >= 0) {
394
				pr_cont(" -> ");
L
Linus Torvalds 已提交
395
				if (hw_is_mask(r->var))
396
					pr_cont("%x", *m->bits);
L
Linus Torvalds 已提交
397 398
				else {
					if (i->empty)
399
						pr_cont("empty");
L
Linus Torvalds 已提交
400
					else
401
						pr_cont("%c%u %u%c",
L
Linus Torvalds 已提交
402 403 404 405
						       i->openmin ? '(' : '[', i->min,
						       i->max, i->openmax ? ')' : ']');
				}
			}
406
			pr_cont("\n");
L
Linus Torvalds 已提交
407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433
#endif
			rstamps[k] = stamp;
			if (changed && r->var >= 0) {
				params->cmask |= (1 << r->var);
				vstamps[r->var] = stamp;
				again = 1;
			}
			if (changed < 0)
				return changed;
			stamp++;
		}
	} while (again);
	if (!params->msbits) {
		i = hw_param_interval(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(params, SNDRV_PCM_HW_PARAM_RATE);
		if (snd_interval_single(i)) {
			params->rate_num = snd_interval_value(i);
			params->rate_den = 1;
		}
	}

	hw = &substream->runtime->hw;
434
	if (!params->info) {
435 436
		params->info = hw->info & ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES |
					    SNDRV_PCM_INFO_DRAIN_TRIGGER);
437 438 439 440
		if (!hw_support_mmap(substream))
			params->info &= ~(SNDRV_PCM_INFO_MMAP |
					  SNDRV_PCM_INFO_MMAP_VALID);
	}
441
	if (!params->fifo_size) {
442 443 444 445
		m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
		i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
		if (snd_mask_min(m) == snd_mask_max(m) &&
                    snd_interval_min(i) == snd_interval_max(i)) {
446 447
			changed = substream->ops->ioctl(substream,
					SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
448
			if (changed < 0)
449 450 451
				return changed;
		}
	}
L
Linus Torvalds 已提交
452 453 454 455
	params->rmask = 0;
	return 0;
}

456 457
EXPORT_SYMBOL(snd_pcm_hw_refine);

T
Takashi Iwai 已提交
458 459
static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
				  struct snd_pcm_hw_params __user * _params)
L
Linus Torvalds 已提交
460
{
T
Takashi Iwai 已提交
461
	struct snd_pcm_hw_params *params;
L
Linus Torvalds 已提交
462 463
	int err;

L
Li Zefan 已提交
464 465 466 467
	params = memdup_user(_params, sizeof(*params));
	if (IS_ERR(params))
		return PTR_ERR(params);

L
Linus Torvalds 已提交
468 469 470 471 472
	err = snd_pcm_hw_refine(substream, params);
	if (copy_to_user(_params, params, sizeof(*params))) {
		if (!err)
			err = -EFAULT;
	}
L
Li Zefan 已提交
473

L
Linus Torvalds 已提交
474 475 476 477
	kfree(params);
	return err;
}

478 479 480 481 482 483 484 485 486 487 488 489 490 491 492
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;
}

493 494 495 496 497 498 499 500
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);
}

501 502 503 504 505 506 507 508 509 510
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
}

T
Takashi Iwai 已提交
511 512
static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
			     struct snd_pcm_hw_params *params)
L
Linus Torvalds 已提交
513
{
T
Takashi Iwai 已提交
514
	struct snd_pcm_runtime *runtime;
515
	int err, usecs;
L
Linus Torvalds 已提交
516 517 518
	unsigned int bits;
	snd_pcm_uframes_t frames;

519 520
	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
L
Linus Torvalds 已提交
521 522 523 524 525 526 527 528 529 530 531 532
	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);
T
Takashi Iwai 已提交
533
#if IS_ENABLED(CONFIG_SND_PCM_OSS)
L
Linus Torvalds 已提交
534 535
	if (!substream->oss.oss)
#endif
536
		if (atomic_read(&substream->mmap_count))
L
Linus Torvalds 已提交
537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564
			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;

	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;
565 566 567
	runtime->no_period_wakeup =
			(params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
			(params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
L
Linus Torvalds 已提交
568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588

	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;
589 590 591
	runtime->boundary = runtime->buffer_size;
	while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
		runtime->boundary *= 2;
L
Linus Torvalds 已提交
592 593

	snd_pcm_timer_resolution_change(substream);
594
	snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
595

596 597
	if (pm_qos_request_active(&substream->latency_pm_qos_req))
		pm_qos_remove_request(&substream->latency_pm_qos_req);
598
	if ((usecs = period_to_usecs(runtime)) >= 0)
599 600
		pm_qos_add_request(&substream->latency_pm_qos_req,
				   PM_QOS_CPU_DMA_LATENCY, usecs);
L
Linus Torvalds 已提交
601 602
	return 0;
 _error:
L
Lucas De Marchi 已提交
603
	/* hardware might be unusable from this time,
L
Linus Torvalds 已提交
604 605
	   so we force application to retry to set
	   the correct hardware parameter settings */
606
	snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
L
Linus Torvalds 已提交
607 608 609 610 611
	if (substream->ops->hw_free != NULL)
		substream->ops->hw_free(substream);
	return err;
}

T
Takashi Iwai 已提交
612 613
static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
				  struct snd_pcm_hw_params __user * _params)
L
Linus Torvalds 已提交
614
{
T
Takashi Iwai 已提交
615
	struct snd_pcm_hw_params *params;
L
Linus Torvalds 已提交
616 617
	int err;

L
Li Zefan 已提交
618 619 620 621
	params = memdup_user(_params, sizeof(*params));
	if (IS_ERR(params))
		return PTR_ERR(params);

L
Linus Torvalds 已提交
622 623 624 625 626
	err = snd_pcm_hw_params(substream, params);
	if (copy_to_user(_params, params, sizeof(*params))) {
		if (!err)
			err = -EFAULT;
	}
L
Li Zefan 已提交
627

L
Linus Torvalds 已提交
628 629 630 631
	kfree(params);
	return err;
}

T
Takashi Iwai 已提交
632
static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
L
Linus Torvalds 已提交
633
{
T
Takashi Iwai 已提交
634
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
635 636
	int result = 0;

637 638
	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
L
Linus Torvalds 已提交
639 640 641 642 643 644 645 646 647 648 649
	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);
650
	if (atomic_read(&substream->mmap_count))
L
Linus Torvalds 已提交
651 652 653
		return -EBADFD;
	if (substream->ops->hw_free)
		result = substream->ops->hw_free(substream);
654
	snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
655
	pm_qos_remove_request(&substream->latency_pm_qos_req);
L
Linus Torvalds 已提交
656 657 658
	return result;
}

T
Takashi Iwai 已提交
659 660
static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
			     struct snd_pcm_sw_params *params)
L
Linus Torvalds 已提交
661
{
T
Takashi Iwai 已提交
662
	struct snd_pcm_runtime *runtime;
663
	int err;
L
Linus Torvalds 已提交
664

665 666
	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
L
Linus Torvalds 已提交
667 668 669 670 671 672 673 674
	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);

675 676
	if (params->tstamp_mode < 0 ||
	    params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
L
Linus Torvalds 已提交
677
		return -EINVAL;
678 679
	if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
	    params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
680
		return -EINVAL;
L
Linus Torvalds 已提交
681 682 683 684 685 686 687 688 689 690 691
	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;
	}
692
	err = 0;
L
Linus Torvalds 已提交
693 694
	snd_pcm_stream_lock_irq(substream);
	runtime->tstamp_mode = params->tstamp_mode;
695 696
	if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
		runtime->tstamp_type = params->tstamp_type;
L
Linus Torvalds 已提交
697 698 699 700 701 702 703 704 705 706 707
	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);
708
		err = snd_pcm_update_state(substream, runtime);
L
Linus Torvalds 已提交
709 710
	}
	snd_pcm_stream_unlock_irq(substream);
711
	return err;
L
Linus Torvalds 已提交
712 713
}

T
Takashi Iwai 已提交
714 715
static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
				  struct snd_pcm_sw_params __user * _params)
L
Linus Torvalds 已提交
716
{
T
Takashi Iwai 已提交
717
	struct snd_pcm_sw_params params;
L
Linus Torvalds 已提交
718 719 720 721 722 723 724 725 726
	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;
}

T
Takashi Iwai 已提交
727 728
int snd_pcm_status(struct snd_pcm_substream *substream,
		   struct snd_pcm_status *status)
L
Linus Torvalds 已提交
729
{
T
Takashi Iwai 已提交
730
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
731 732

	snd_pcm_stream_lock_irq(substream);
733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749

	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;

L
Linus Torvalds 已提交
750 751 752 753 754
	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;
755
	if (snd_pcm_running(substream)) {
L
Linus Torvalds 已提交
756
		snd_pcm_update_hw_ptr(substream);
757 758
		if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
			status->tstamp = runtime->status->tstamp;
759
			status->driver_tstamp = runtime->driver_tstamp;
760 761
			status->audio_tstamp =
				runtime->status->audio_tstamp;
762 763 764 765 766 767
			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);

768 769
			goto _tstamp_end;
		}
770 771 772 773
	} 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);
774 775
	}
 _tstamp_end:
L
Linus Torvalds 已提交
776 777 778 779 780
	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 ||
781
		    runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
L
Linus Torvalds 已提交
782
			status->delay = runtime->buffer_size - status->avail;
783 784
			status->delay += runtime->delay;
		} else
L
Linus Torvalds 已提交
785 786 787 788
			status->delay = 0;
	} else {
		status->avail = snd_pcm_capture_avail(runtime);
		if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
789
			status->delay = status->avail + runtime->delay;
L
Linus Torvalds 已提交
790 791 792 793 794 795 796 797 798 799 800 801
		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;
}

T
Takashi Iwai 已提交
802
static int snd_pcm_status_user(struct snd_pcm_substream *substream,
803 804
			       struct snd_pcm_status __user * _status,
			       bool ext)
L
Linus Torvalds 已提交
805
{
T
Takashi Iwai 已提交
806
	struct snd_pcm_status status;
L
Linus Torvalds 已提交
807
	int res;
808

L
Linus Torvalds 已提交
809
	memset(&status, 0, sizeof(status));
810 811 812 813 814 815 816 817
	/*
	 * 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;
L
Linus Torvalds 已提交
818 819 820 821 822 823 824 825
	res = snd_pcm_status(substream, &status);
	if (res < 0)
		return res;
	if (copy_to_user(_status, &status, sizeof(status)))
		return -EFAULT;
	return 0;
}

T
Takashi Iwai 已提交
826 827
static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
				struct snd_pcm_channel_info * info)
L
Linus Torvalds 已提交
828
{
T
Takashi Iwai 已提交
829
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846
	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);
}

T
Takashi Iwai 已提交
847 848
static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
				     struct snd_pcm_channel_info __user * _info)
L
Linus Torvalds 已提交
849
{
T
Takashi Iwai 已提交
850
	struct snd_pcm_channel_info info;
L
Linus Torvalds 已提交
851 852 853 854 855 856 857 858 859 860 861 862
	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;
}

T
Takashi Iwai 已提交
863
static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
L
Linus Torvalds 已提交
864
{
T
Takashi Iwai 已提交
865
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
866 867 868
	if (runtime->trigger_master == NULL)
		return;
	if (runtime->trigger_master == substream) {
869 870
		if (!runtime->trigger_tstamp_latched)
			snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
L
Linus Torvalds 已提交
871 872 873 874 875 876 877 878
	} else {
		snd_pcm_trigger_tstamp(runtime->trigger_master);
		runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
	}
	runtime->trigger_master = NULL;
}

struct action_ops {
T
Takashi Iwai 已提交
879 880 881 882
	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);
L
Linus Torvalds 已提交
883 884 885 886 887 888 889
};

/*
 *  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
 */
890
static int snd_pcm_action_group(const struct action_ops *ops,
T
Takashi Iwai 已提交
891
				struct snd_pcm_substream *substream,
L
Linus Torvalds 已提交
892 893
				int state, int do_lock)
{
T
Takashi Iwai 已提交
894 895
	struct snd_pcm_substream *s = NULL;
	struct snd_pcm_substream *s1;
896
	int res = 0, depth = 1;
L
Linus Torvalds 已提交
897

898
	snd_pcm_group_for_each_entry(s, substream) {
899 900
		if (do_lock && s != substream) {
			if (s->pcm->nonatomic)
901
				mutex_lock_nested(&s->self_group.mutex, depth);
902
			else
903 904
				spin_lock_nested(&s->self_group.lock, depth);
			depth++;
905
		}
L
Linus Torvalds 已提交
906 907 908 909
		res = ops->pre_action(s, state);
		if (res < 0)
			goto _unlock;
	}
910
	snd_pcm_group_for_each_entry(s, substream) {
L
Linus Torvalds 已提交
911 912 913
		res = ops->do_action(s, state);
		if (res < 0) {
			if (ops->undo_action) {
914
				snd_pcm_group_for_each_entry(s1, substream) {
L
Linus Torvalds 已提交
915 916 917 918 919 920 921 922 923
					if (s1 == s) /* failed stream */
						break;
					ops->undo_action(s1, state);
				}
			}
			s = NULL; /* unlock all */
			goto _unlock;
		}
	}
924
	snd_pcm_group_for_each_entry(s, substream) {
L
Linus Torvalds 已提交
925 926 927 928 929
		ops->post_action(s, state);
	}
 _unlock:
	if (do_lock) {
		/* unlock streams */
930
		snd_pcm_group_for_each_entry(s1, substream) {
931
			if (s1 != substream) {
932
				if (s1->pcm->nonatomic)
933 934 935 936
					mutex_unlock(&s1->self_group.mutex);
				else
					spin_unlock(&s1->self_group.lock);
			}
L
Linus Torvalds 已提交
937 938 939 940 941 942 943 944 945 946
			if (s1 == s)	/* end */
				break;
		}
	}
	return res;
}

/*
 *  Note: call with stream lock
 */
947
static int snd_pcm_action_single(const struct action_ops *ops,
T
Takashi Iwai 已提交
948
				 struct snd_pcm_substream *substream,
L
Linus Torvalds 已提交
949 950 951 952 953 954 955 956 957 958 959 960 961 962 963
				 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;
}

964 965 966
/*
 *  Note: call with stream lock
 */
967
static int snd_pcm_action(const struct action_ops *ops,
968 969
			  struct snd_pcm_substream *substream,
			  int state)
970 971 972
{
	int res;

973 974 975 976
	if (!snd_pcm_stream_linked(substream))
		return snd_pcm_action_single(ops, substream, state);

	if (substream->pcm->nonatomic) {
977 978 979 980 981 982 983 984
		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 {
L
Linus Torvalds 已提交
985 986 987 988 989 990 991 992 993 994 995 996 997 998
		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
 */
999
static int snd_pcm_action_lock_irq(const struct action_ops *ops,
T
Takashi Iwai 已提交
1000
				   struct snd_pcm_substream *substream,
L
Linus Torvalds 已提交
1001 1002 1003 1004
				   int state)
{
	int res;

1005 1006 1007
	snd_pcm_stream_lock_irq(substream);
	res = snd_pcm_action(ops, substream, state);
	snd_pcm_stream_unlock_irq(substream);
L
Linus Torvalds 已提交
1008 1009 1010 1011 1012
	return res;
}

/*
 */
1013
static int snd_pcm_action_nonatomic(const struct action_ops *ops,
T
Takashi Iwai 已提交
1014
				    struct snd_pcm_substream *substream,
L
Linus Torvalds 已提交
1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030
				    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
 */
T
Takashi Iwai 已提交
1031
static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
L
Linus Torvalds 已提交
1032
{
T
Takashi Iwai 已提交
1033
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
1034 1035 1036 1037 1038
	if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
		return -EBADFD;
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
	    !snd_pcm_playback_data(substream))
		return -EPIPE;
1039
	runtime->trigger_tstamp_latched = false;
L
Linus Torvalds 已提交
1040 1041 1042 1043
	runtime->trigger_master = substream;
	return 0;
}

T
Takashi Iwai 已提交
1044
static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
L
Linus Torvalds 已提交
1045 1046 1047 1048 1049 1050
{
	if (substream->runtime->trigger_master != substream)
		return 0;
	return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
}

T
Takashi Iwai 已提交
1051
static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
L
Linus Torvalds 已提交
1052 1053 1054 1055 1056
{
	if (substream->runtime->trigger_master == substream)
		substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
}

T
Takashi Iwai 已提交
1057
static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
L
Linus Torvalds 已提交
1058
{
T
Takashi Iwai 已提交
1059
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
1060
	snd_pcm_trigger_tstamp(substream);
1061
	runtime->hw_ptr_jiffies = jiffies;
1062 1063
	runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 
							    runtime->rate;
L
Linus Torvalds 已提交
1064 1065 1066 1067
	runtime->status->state = state;
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
	    runtime->silence_size > 0)
		snd_pcm_playback_silence(substream, ULONG_MAX);
1068
	snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART);
L
Linus Torvalds 已提交
1069 1070
}

1071
static const struct action_ops snd_pcm_action_start = {
L
Linus Torvalds 已提交
1072 1073 1074 1075 1076 1077 1078
	.pre_action = snd_pcm_pre_start,
	.do_action = snd_pcm_do_start,
	.undo_action = snd_pcm_undo_start,
	.post_action = snd_pcm_post_start
};

/**
1079
 * snd_pcm_start - start all linked streams
T
Takashi Iwai 已提交
1080
 * @substream: the PCM substream instance
1081 1082
 *
 * Return: Zero if successful, or a negative error code.
L
Linus Torvalds 已提交
1083
 */
T
Takashi Iwai 已提交
1084
int snd_pcm_start(struct snd_pcm_substream *substream)
L
Linus Torvalds 已提交
1085
{
T
Takashi Iwai 已提交
1086 1087
	return snd_pcm_action(&snd_pcm_action_start, substream,
			      SNDRV_PCM_STATE_RUNNING);
L
Linus Torvalds 已提交
1088 1089 1090 1091 1092
}

/*
 * stop callbacks
 */
T
Takashi Iwai 已提交
1093
static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
L
Linus Torvalds 已提交
1094
{
T
Takashi Iwai 已提交
1095
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
1096 1097 1098 1099 1100 1101
	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
		return -EBADFD;
	runtime->trigger_master = substream;
	return 0;
}

T
Takashi Iwai 已提交
1102
static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
L
Linus Torvalds 已提交
1103 1104 1105 1106 1107 1108 1109
{
	if (substream->runtime->trigger_master == substream &&
	    snd_pcm_running(substream))
		substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
	return 0; /* unconditonally stop all substreams */
}

T
Takashi Iwai 已提交
1110
static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
L
Linus Torvalds 已提交
1111
{
T
Takashi Iwai 已提交
1112
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
1113 1114
	if (runtime->status->state != state) {
		snd_pcm_trigger_tstamp(substream);
1115
		runtime->status->state = state;
1116
		snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP);
L
Linus Torvalds 已提交
1117 1118
	}
	wake_up(&runtime->sleep);
1119
	wake_up(&runtime->tsleep);
L
Linus Torvalds 已提交
1120 1121
}

1122
static const struct action_ops snd_pcm_action_stop = {
L
Linus Torvalds 已提交
1123 1124 1125 1126 1127 1128
	.pre_action = snd_pcm_pre_stop,
	.do_action = snd_pcm_do_stop,
	.post_action = snd_pcm_post_stop
};

/**
1129
 * snd_pcm_stop - try to stop all running streams in the substream group
T
Takashi Iwai 已提交
1130 1131
 * @substream: the PCM substream instance
 * @state: PCM state after stopping the stream
L
Linus Torvalds 已提交
1132
 *
1133
 * The state of each stream is then changed to the given state unconditionally.
1134
 *
1135
 * Return: Zero if successful, or a negative error code.
L
Linus Torvalds 已提交
1136
 */
C
Clemens Ladisch 已提交
1137
int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
L
Linus Torvalds 已提交
1138 1139 1140 1141
{
	return snd_pcm_action(&snd_pcm_action_stop, substream, state);
}

1142 1143
EXPORT_SYMBOL(snd_pcm_stop);

L
Linus Torvalds 已提交
1144
/**
1145
 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
T
Takashi Iwai 已提交
1146
 * @substream: the PCM substream
L
Linus Torvalds 已提交
1147
 *
1148
 * After stopping, the state is changed to SETUP.
L
Linus Torvalds 已提交
1149
 * Unlike snd_pcm_stop(), this affects only the given stream.
1150 1151
 *
 * Return: Zero if succesful, or a negative error code.
L
Linus Torvalds 已提交
1152
 */
T
Takashi Iwai 已提交
1153
int snd_pcm_drain_done(struct snd_pcm_substream *substream)
L
Linus Torvalds 已提交
1154
{
T
Takashi Iwai 已提交
1155 1156
	return snd_pcm_action_single(&snd_pcm_action_stop, substream,
				     SNDRV_PCM_STATE_SETUP);
L
Linus Torvalds 已提交
1157 1158
}

1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180
/**
 * 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);

L
Linus Torvalds 已提交
1181 1182 1183
/*
 * pause callbacks
 */
T
Takashi Iwai 已提交
1184
static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
L
Linus Torvalds 已提交
1185
{
T
Takashi Iwai 已提交
1186
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197
	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;
}

T
Takashi Iwai 已提交
1198
static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
L
Linus Torvalds 已提交
1199 1200 1201
{
	if (substream->runtime->trigger_master != substream)
		return 0;
1202 1203 1204 1205
	/* some drivers might use hw_ptr to recover from the pause -
	   update the hw_ptr now */
	if (push)
		snd_pcm_update_hw_ptr(substream);
1206
	/* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1207
	 * a delta between the current jiffies, this gives a large enough
1208 1209 1210
	 * delta, effectively to skip the check once.
	 */
	substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
L
Linus Torvalds 已提交
1211 1212 1213 1214 1215
	return substream->ops->trigger(substream,
				       push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
					      SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
}

T
Takashi Iwai 已提交
1216
static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
L
Linus Torvalds 已提交
1217 1218 1219 1220 1221 1222 1223
{
	if (substream->runtime->trigger_master == substream)
		substream->ops->trigger(substream,
					push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
					SNDRV_PCM_TRIGGER_PAUSE_PUSH);
}

T
Takashi Iwai 已提交
1224
static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
L
Linus Torvalds 已提交
1225
{
T
Takashi Iwai 已提交
1226
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
1227 1228 1229
	snd_pcm_trigger_tstamp(substream);
	if (push) {
		runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1230
		snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE);
L
Linus Torvalds 已提交
1231
		wake_up(&runtime->sleep);
1232
		wake_up(&runtime->tsleep);
L
Linus Torvalds 已提交
1233 1234
	} else {
		runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1235
		snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE);
L
Linus Torvalds 已提交
1236 1237 1238
	}
}

1239
static const struct action_ops snd_pcm_action_pause = {
L
Linus Torvalds 已提交
1240 1241 1242 1243 1244 1245 1246 1247 1248
	.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.
 */
T
Takashi Iwai 已提交
1249
static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
L
Linus Torvalds 已提交
1250 1251 1252 1253 1254 1255 1256
{
	return snd_pcm_action(&snd_pcm_action_pause, substream, push);
}

#ifdef CONFIG_PM
/* suspend */

T
Takashi Iwai 已提交
1257
static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
L
Linus Torvalds 已提交
1258
{
T
Takashi Iwai 已提交
1259
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
1260 1261 1262 1263 1264 1265
	if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
		return -EBUSY;
	runtime->trigger_master = substream;
	return 0;
}

T
Takashi Iwai 已提交
1266
static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
L
Linus Torvalds 已提交
1267
{
T
Takashi Iwai 已提交
1268
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
1269 1270 1271 1272 1273 1274 1275 1276
	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 */
}

T
Takashi Iwai 已提交
1277
static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
L
Linus Torvalds 已提交
1278
{
T
Takashi Iwai 已提交
1279
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
1280
	snd_pcm_trigger_tstamp(substream);
1281 1282
	runtime->status->suspended_state = runtime->status->state;
	runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1283
	snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND);
L
Linus Torvalds 已提交
1284
	wake_up(&runtime->sleep);
1285
	wake_up(&runtime->tsleep);
L
Linus Torvalds 已提交
1286 1287
}

1288
static const struct action_ops snd_pcm_action_suspend = {
L
Linus Torvalds 已提交
1289 1290 1291 1292 1293 1294
	.pre_action = snd_pcm_pre_suspend,
	.do_action = snd_pcm_do_suspend,
	.post_action = snd_pcm_post_suspend
};

/**
1295
 * snd_pcm_suspend - trigger SUSPEND to all linked streams
T
Takashi Iwai 已提交
1296
 * @substream: the PCM substream
L
Linus Torvalds 已提交
1297 1298
 *
 * After this call, all streams are changed to SUSPENDED state.
1299 1300 1301
 *
 * Return: Zero if successful (or @substream is %NULL), or a negative error
 * code.
L
Linus Torvalds 已提交
1302
 */
T
Takashi Iwai 已提交
1303
int snd_pcm_suspend(struct snd_pcm_substream *substream)
L
Linus Torvalds 已提交
1304 1305 1306 1307
{
	int err;
	unsigned long flags;

1308 1309 1310
	if (! substream)
		return 0;

L
Linus Torvalds 已提交
1311 1312 1313 1314 1315 1316
	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;
}

1317 1318
EXPORT_SYMBOL(snd_pcm_suspend);

L
Linus Torvalds 已提交
1319
/**
1320
 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
T
Takashi Iwai 已提交
1321
 * @pcm: the PCM instance
L
Linus Torvalds 已提交
1322 1323
 *
 * After this call, all streams are changed to SUSPENDED state.
1324 1325
 *
 * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
L
Linus Torvalds 已提交
1326
 */
T
Takashi Iwai 已提交
1327
int snd_pcm_suspend_all(struct snd_pcm *pcm)
L
Linus Torvalds 已提交
1328
{
T
Takashi Iwai 已提交
1329
	struct snd_pcm_substream *substream;
L
Linus Torvalds 已提交
1330 1331
	int stream, err = 0;

1332 1333 1334
	if (! pcm)
		return 0;

L
Linus Torvalds 已提交
1335
	for (stream = 0; stream < 2; stream++) {
T
Takashi Iwai 已提交
1336 1337
		for (substream = pcm->streams[stream].substream;
		     substream; substream = substream->next) {
L
Linus Torvalds 已提交
1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348
			/* 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;
}

1349 1350
EXPORT_SYMBOL(snd_pcm_suspend_all);

L
Linus Torvalds 已提交
1351 1352
/* resume */

T
Takashi Iwai 已提交
1353
static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
L
Linus Torvalds 已提交
1354
{
T
Takashi Iwai 已提交
1355
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
1356 1357 1358 1359 1360 1361
	if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
		return -ENOSYS;
	runtime->trigger_master = substream;
	return 0;
}

T
Takashi Iwai 已提交
1362
static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
L
Linus Torvalds 已提交
1363
{
T
Takashi Iwai 已提交
1364
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
1365 1366 1367 1368 1369 1370 1371 1372 1373 1374
	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);
}

T
Takashi Iwai 已提交
1375
static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
L
Linus Torvalds 已提交
1376 1377 1378 1379 1380 1381
{
	if (substream->runtime->trigger_master == substream &&
	    snd_pcm_running(substream))
		substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
}

T
Takashi Iwai 已提交
1382
static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
L
Linus Torvalds 已提交
1383
{
T
Takashi Iwai 已提交
1384
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
1385
	snd_pcm_trigger_tstamp(substream);
1386
	runtime->status->state = runtime->status->suspended_state;
1387
	snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME);
L
Linus Torvalds 已提交
1388 1389
}

1390
static const struct action_ops snd_pcm_action_resume = {
L
Linus Torvalds 已提交
1391 1392 1393 1394 1395 1396
	.pre_action = snd_pcm_pre_resume,
	.do_action = snd_pcm_do_resume,
	.undo_action = snd_pcm_undo_resume,
	.post_action = snd_pcm_post_resume
};

T
Takashi Iwai 已提交
1397
static int snd_pcm_resume(struct snd_pcm_substream *substream)
L
Linus Torvalds 已提交
1398
{
T
Takashi Iwai 已提交
1399
	struct snd_card *card = substream->pcm->card;
L
Linus Torvalds 已提交
1400 1401 1402
	int res;

	snd_power_lock(card);
1403
	if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
L
Linus Torvalds 已提交
1404 1405 1406 1407 1408 1409 1410
		res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
	snd_power_unlock(card);
	return res;
}

#else

T
Takashi Iwai 已提交
1411
static int snd_pcm_resume(struct snd_pcm_substream *substream)
L
Linus Torvalds 已提交
1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422
{
	return -ENOSYS;
}

#endif /* CONFIG_PM */

/*
 * xrun ioctl
 *
 * Change the RUNNING stream(s) to XRUN state.
 */
T
Takashi Iwai 已提交
1423
static int snd_pcm_xrun(struct snd_pcm_substream *substream)
L
Linus Torvalds 已提交
1424
{
T
Takashi Iwai 已提交
1425 1426
	struct snd_card *card = substream->pcm->card;
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
1427 1428 1429 1430
	int result;

	snd_power_lock(card);
	if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1431
		result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
L
Linus Torvalds 已提交
1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455
		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
 */
T
Takashi Iwai 已提交
1456
static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
L
Linus Torvalds 已提交
1457
{
T
Takashi Iwai 已提交
1458
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469
	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;
	}
}

T
Takashi Iwai 已提交
1470
static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
L
Linus Torvalds 已提交
1471
{
T
Takashi Iwai 已提交
1472
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
1473 1474 1475 1476
	int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
	if (err < 0)
		return err;
	runtime->hw_ptr_base = 0;
1477 1478
	runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
		runtime->status->hw_ptr % runtime->period_size;
L
Linus Torvalds 已提交
1479 1480 1481 1482 1483
	runtime->silence_start = runtime->status->hw_ptr;
	runtime->silence_filled = 0;
	return 0;
}

T
Takashi Iwai 已提交
1484
static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
L
Linus Torvalds 已提交
1485
{
T
Takashi Iwai 已提交
1486
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
1487 1488 1489 1490 1491 1492
	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);
}

1493
static const struct action_ops snd_pcm_action_reset = {
L
Linus Torvalds 已提交
1494 1495 1496 1497 1498
	.pre_action = snd_pcm_pre_reset,
	.do_action = snd_pcm_do_reset,
	.post_action = snd_pcm_post_reset
};

T
Takashi Iwai 已提交
1499
static int snd_pcm_reset(struct snd_pcm_substream *substream)
L
Linus Torvalds 已提交
1500 1501 1502 1503 1504 1505 1506
{
	return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
}

/*
 * prepare ioctl
 */
1507 1508 1509
/* we use the second argument for updating f_flags */
static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
			       int f_flags)
L
Linus Torvalds 已提交
1510
{
T
Takashi Iwai 已提交
1511
	struct snd_pcm_runtime *runtime = substream->runtime;
1512 1513
	if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
	    runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
L
Linus Torvalds 已提交
1514 1515 1516
		return -EBADFD;
	if (snd_pcm_running(substream))
		return -EBUSY;
1517
	substream->f_flags = f_flags;
L
Linus Torvalds 已提交
1518 1519 1520
	return 0;
}

T
Takashi Iwai 已提交
1521
static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
L
Linus Torvalds 已提交
1522 1523 1524 1525 1526 1527 1528 1529
{
	int err;
	err = substream->ops->prepare(substream);
	if (err < 0)
		return err;
	return snd_pcm_do_reset(substream, 0);
}

T
Takashi Iwai 已提交
1530
static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
L
Linus Torvalds 已提交
1531
{
T
Takashi Iwai 已提交
1532
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
1533
	runtime->control->appl_ptr = runtime->status->hw_ptr;
1534
	snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
L
Linus Torvalds 已提交
1535 1536
}

1537
static const struct action_ops snd_pcm_action_prepare = {
L
Linus Torvalds 已提交
1538 1539 1540 1541 1542 1543
	.pre_action = snd_pcm_pre_prepare,
	.do_action = snd_pcm_do_prepare,
	.post_action = snd_pcm_post_prepare
};

/**
1544
 * snd_pcm_prepare - prepare the PCM substream to be triggerable
T
Takashi Iwai 已提交
1545
 * @substream: the PCM substream instance
1546
 * @file: file to refer f_flags
1547 1548
 *
 * Return: Zero if successful, or a negative error code.
L
Linus Torvalds 已提交
1549
 */
1550 1551
static int snd_pcm_prepare(struct snd_pcm_substream *substream,
			   struct file *file)
L
Linus Torvalds 已提交
1552 1553
{
	int res;
T
Takashi Iwai 已提交
1554
	struct snd_card *card = substream->pcm->card;
1555 1556 1557 1558 1559 1560
	int f_flags;

	if (file)
		f_flags = file->f_flags;
	else
		f_flags = substream->f_flags;
L
Linus Torvalds 已提交
1561 1562

	snd_power_lock(card);
1563
	if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1564 1565
		res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
					       substream, f_flags);
L
Linus Torvalds 已提交
1566 1567 1568 1569 1570 1571 1572 1573
	snd_power_unlock(card);
	return res;
}

/*
 * drain ioctl
 */

T
Takashi Iwai 已提交
1574
static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
L
Linus Torvalds 已提交
1575
{
1576 1577 1578 1579 1580 1581 1582 1583
	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;
L
Linus Torvalds 已提交
1584 1585 1586
	return 0;
}

T
Takashi Iwai 已提交
1587
static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
L
Linus Torvalds 已提交
1588
{
T
Takashi Iwai 已提交
1589
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
1590 1591 1592 1593 1594 1595 1596
	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);
1597 1598
			} else {
				runtime->status->state = SNDRV_PCM_STATE_SETUP;
L
Linus Torvalds 已提交
1599 1600 1601 1602 1603
			}
			break;
		case SNDRV_PCM_STATE_RUNNING:
			runtime->status->state = SNDRV_PCM_STATE_DRAINING;
			break;
1604 1605 1606
		case SNDRV_PCM_STATE_XRUN:
			runtime->status->state = SNDRV_PCM_STATE_SETUP;
			break;
L
Linus Torvalds 已提交
1607 1608 1609 1610 1611 1612
		default:
			break;
		}
	} else {
		/* stop running stream */
		if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1613
			int new_state = snd_pcm_capture_avail(runtime) > 0 ?
L
Linus Torvalds 已提交
1614
				SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1615 1616
			snd_pcm_do_stop(substream, new_state);
			snd_pcm_post_stop(substream, new_state);
L
Linus Torvalds 已提交
1617 1618
		}
	}
1619 1620 1621 1622 1623 1624 1625

	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);

L
Linus Torvalds 已提交
1626 1627 1628
	return 0;
}

T
Takashi Iwai 已提交
1629
static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
L
Linus Torvalds 已提交
1630 1631 1632
{
}

1633
static const struct action_ops snd_pcm_action_drain_init = {
L
Linus Torvalds 已提交
1634 1635 1636 1637 1638
	.pre_action = snd_pcm_pre_drain_init,
	.do_action = snd_pcm_do_drain_init,
	.post_action = snd_pcm_post_drain_init
};

T
Takashi Iwai 已提交
1639
static int snd_pcm_drop(struct snd_pcm_substream *substream);
L
Linus Torvalds 已提交
1640 1641 1642 1643 1644 1645 1646 1647

/*
 * 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.
 */
1648 1649
static int snd_pcm_drain(struct snd_pcm_substream *substream,
			 struct file *file)
L
Linus Torvalds 已提交
1650
{
T
Takashi Iwai 已提交
1651 1652
	struct snd_card *card;
	struct snd_pcm_runtime *runtime;
1653
	struct snd_pcm_substream *s;
1654
	wait_queue_t wait;
L
Linus Torvalds 已提交
1655
	int result = 0;
1656
	int nonblock = 0;
L
Linus Torvalds 已提交
1657 1658 1659 1660 1661 1662 1663 1664 1665

	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) {
1666
		result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1667 1668 1669 1670
		if (result < 0) {
			snd_power_unlock(card);
			return result;
		}
L
Linus Torvalds 已提交
1671 1672
	}

1673 1674 1675 1676 1677 1678
	if (file) {
		if (file->f_flags & O_NONBLOCK)
			nonblock = 1;
	} else if (substream->f_flags & O_NONBLOCK)
		nonblock = 1;

1679 1680 1681
	down_read(&snd_pcm_link_rwsem);
	snd_pcm_stream_lock_irq(substream);
	/* resume pause */
1682
	if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1683 1684 1685 1686
		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);
1687 1688 1689 1690 1691 1692
	if (result < 0)
		goto unlock;
	/* in non-blocking, we don't wait in ioctl but let caller poll */
	if (nonblock) {
		result = -EAGAIN;
		goto unlock;
1693
	}
L
Linus Torvalds 已提交
1694 1695 1696

	for (;;) {
		long tout;
1697
		struct snd_pcm_runtime *to_check;
L
Linus Torvalds 已提交
1698 1699 1700 1701
		if (signal_pending(current)) {
			result = -ERESTARTSYS;
			break;
		}
1702 1703 1704 1705 1706 1707 1708 1709
		/* 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;
1710
				break;
1711
			}
1712
		}
1713 1714 1715 1716
		if (!to_check)
			break; /* all drained */
		init_waitqueue_entry(&wait, current);
		add_wait_queue(&to_check->sleep, &wait);
L
Linus Torvalds 已提交
1717
		snd_pcm_stream_unlock_irq(substream);
1718
		up_read(&snd_pcm_link_rwsem);
L
Linus Torvalds 已提交
1719
		snd_power_unlock(card);
1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730
		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);
L
Linus Torvalds 已提交
1731
		snd_power_lock(card);
1732
		down_read(&snd_pcm_link_rwsem);
L
Linus Torvalds 已提交
1733
		snd_pcm_stream_lock_irq(substream);
1734
		remove_wait_queue(&to_check->sleep, &wait);
1735 1736 1737 1738
		if (card->shutdown) {
			result = -ENODEV;
			break;
		}
L
Linus Torvalds 已提交
1739 1740 1741 1742
		if (tout == 0) {
			if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
				result = -ESTRPIPE;
			else {
1743 1744
				dev_dbg(substream->pcm->card->dev,
					"playback drain error (DMA or IRQ trouble?)\n");
L
Linus Torvalds 已提交
1745 1746 1747 1748 1749 1750
				snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
				result = -EIO;
			}
			break;
		}
	}
1751

1752
 unlock:
1753
	snd_pcm_stream_unlock_irq(substream);
1754
	up_read(&snd_pcm_link_rwsem);
L
Linus Torvalds 已提交
1755 1756 1757 1758 1759 1760 1761 1762 1763 1764
	snd_power_unlock(card);

	return result;
}

/*
 * drop ioctl
 *
 * Immediately put all linked substreams into SETUP state.
 */
T
Takashi Iwai 已提交
1765
static int snd_pcm_drop(struct snd_pcm_substream *substream)
L
Linus Torvalds 已提交
1766
{
T
Takashi Iwai 已提交
1767
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
1768 1769
	int result = 0;
	
1770 1771
	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
L
Linus Torvalds 已提交
1772 1773
	runtime = substream->runtime;

1774
	if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1775 1776
	    runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
	    runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
L
Linus Torvalds 已提交
1777 1778 1779 1780 1781 1782 1783 1784 1785 1786
		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);
1787

L
Linus Torvalds 已提交
1788 1789 1790 1791
	return result;
}


A
Al Viro 已提交
1792
static bool is_pcm_file(struct file *file)
L
Linus Torvalds 已提交
1793
{
A
Al Viro 已提交
1794
	struct inode *inode = file_inode(file);
1795 1796
	unsigned int minor;

A
Al Viro 已提交
1797 1798
	if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
		return false;
L
Linus Torvalds 已提交
1799
	minor = iminor(inode);
A
Al Viro 已提交
1800 1801
	return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) ||
		snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
L
Linus Torvalds 已提交
1802 1803 1804 1805 1806
}

/*
 * PCM link handling
 */
T
Takashi Iwai 已提交
1807
static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
L
Linus Torvalds 已提交
1808 1809
{
	int res = 0;
T
Takashi Iwai 已提交
1810 1811
	struct snd_pcm_file *pcm_file;
	struct snd_pcm_substream *substream1;
1812
	struct snd_pcm_group *group;
A
Al Viro 已提交
1813
	struct fd f = fdget(fd);
L
Linus Torvalds 已提交
1814

A
Al Viro 已提交
1815
	if (!f.file)
L
Linus Torvalds 已提交
1816
		return -EBADFD;
A
Al Viro 已提交
1817 1818 1819 1820 1821
	if (!is_pcm_file(f.file)) {
		res = -EBADFD;
		goto _badf;
	}
	pcm_file = f.file->private_data;
L
Linus Torvalds 已提交
1822
	substream1 = pcm_file->substream;
1823 1824 1825 1826 1827
	group = kmalloc(sizeof(*group), GFP_KERNEL);
	if (!group) {
		res = -ENOMEM;
		goto _nolock;
	}
1828
	down_write_nonblock(&snd_pcm_link_rwsem);
L
Linus Torvalds 已提交
1829 1830
	write_lock_irq(&snd_pcm_link_rwlock);
	if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1831 1832
	    substream->runtime->status->state != substream1->runtime->status->state ||
	    substream->pcm->nonatomic != substream1->pcm->nonatomic) {
L
Linus Torvalds 已提交
1833 1834 1835 1836 1837 1838 1839 1840
		res = -EBADFD;
		goto _end;
	}
	if (snd_pcm_stream_linked(substream1)) {
		res = -EALREADY;
		goto _end;
	}
	if (!snd_pcm_stream_linked(substream)) {
1841
		substream->group = group;
A
Al Viro 已提交
1842
		group = NULL;
L
Linus Torvalds 已提交
1843
		spin_lock_init(&substream->group->lock);
1844
		mutex_init(&substream->group->mutex);
L
Linus Torvalds 已提交
1845 1846 1847 1848 1849 1850 1851 1852 1853 1854
		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);
1855
 _nolock:
1856
	snd_card_unref(substream1->pcm->card);
A
Al Viro 已提交
1857
	kfree(group);
A
Al Viro 已提交
1858 1859
 _badf:
	fdput(f);
L
Linus Torvalds 已提交
1860 1861 1862
	return res;
}

T
Takashi Iwai 已提交
1863
static void relink_to_local(struct snd_pcm_substream *substream)
L
Linus Torvalds 已提交
1864 1865 1866 1867 1868 1869
{
	substream->group = &substream->self_group;
	INIT_LIST_HEAD(&substream->self_group.substreams);
	list_add_tail(&substream->link_list, &substream->self_group.substreams);
}

T
Takashi Iwai 已提交
1870
static int snd_pcm_unlink(struct snd_pcm_substream *substream)
L
Linus Torvalds 已提交
1871
{
1872
	struct snd_pcm_substream *s;
L
Linus Torvalds 已提交
1873 1874
	int res = 0;

1875
	down_write_nonblock(&snd_pcm_link_rwsem);
L
Linus Torvalds 已提交
1876 1877 1878 1879 1880 1881 1882 1883
	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 */
1884 1885
		snd_pcm_group_for_each_entry(s, substream) {
			relink_to_local(s);
L
Linus Torvalds 已提交
1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899
			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
 */
T
Takashi Iwai 已提交
1900 1901
static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
			       struct snd_pcm_hw_rule *rule)
L
Linus Torvalds 已提交
1902
{
T
Takashi Iwai 已提交
1903
	struct snd_interval t;
L
Linus Torvalds 已提交
1904 1905 1906 1907 1908
	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);
}

T
Takashi Iwai 已提交
1909 1910
static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
			       struct snd_pcm_hw_rule *rule)
L
Linus Torvalds 已提交
1911
{
T
Takashi Iwai 已提交
1912
	struct snd_interval t;
L
Linus Torvalds 已提交
1913 1914 1915 1916 1917
	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);
}

T
Takashi Iwai 已提交
1918 1919
static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
				   struct snd_pcm_hw_rule *rule)
L
Linus Torvalds 已提交
1920
{
T
Takashi Iwai 已提交
1921
	struct snd_interval t;
L
Linus Torvalds 已提交
1922 1923 1924 1925 1926 1927
	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);
}

T
Takashi Iwai 已提交
1928 1929
static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
				   struct snd_pcm_hw_rule *rule)
L
Linus Torvalds 已提交
1930
{
T
Takashi Iwai 已提交
1931
	struct snd_interval t;
L
Linus Torvalds 已提交
1932 1933 1934 1935 1936 1937
	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);
}

T
Takashi Iwai 已提交
1938 1939
static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
				  struct snd_pcm_hw_rule *rule)
L
Linus Torvalds 已提交
1940 1941
{
	unsigned int k;
T
Takashi Iwai 已提交
1942 1943 1944
	struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
	struct snd_mask m;
	struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
L
Linus Torvalds 已提交
1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958
	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);
}

T
Takashi Iwai 已提交
1959 1960
static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
				       struct snd_pcm_hw_rule *rule)
L
Linus Torvalds 已提交
1961
{
T
Takashi Iwai 已提交
1962
	struct snd_interval t;
L
Linus Torvalds 已提交
1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990
	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

static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
                                 48000, 64000, 88200, 96000, 176400, 192000 };

1991 1992 1993 1994 1995
const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
	.count = ARRAY_SIZE(rates),
	.list = rates,
};

T
Takashi Iwai 已提交
1996 1997
static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
				struct snd_pcm_hw_rule *rule)
L
Linus Torvalds 已提交
1998
{
T
Takashi Iwai 已提交
1999
	struct snd_pcm_hardware *hw = rule->private;
L
Linus Torvalds 已提交
2000
	return snd_interval_list(hw_param_interval(params, rule->var),
2001 2002
				 snd_pcm_known_rates.count,
				 snd_pcm_known_rates.list, hw->rates);
L
Linus Torvalds 已提交
2003 2004
}		

T
Takashi Iwai 已提交
2005 2006
static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
					    struct snd_pcm_hw_rule *rule)
L
Linus Torvalds 已提交
2007
{
T
Takashi Iwai 已提交
2008 2009
	struct snd_interval t;
	struct snd_pcm_substream *substream = rule->private;
L
Linus Torvalds 已提交
2010 2011 2012 2013 2014 2015 2016 2017
	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);
}		

T
Takashi Iwai 已提交
2018
int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
L
Linus Torvalds 已提交
2019
{
T
Takashi Iwai 已提交
2020 2021
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
L
Linus Torvalds 已提交
2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 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 2133 2134 2135 2136 2137 2138 2139 2140 2141
	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;
}

T
Takashi Iwai 已提交
2142
int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
L
Linus Torvalds 已提交
2143
{
T
Takashi Iwai 已提交
2144 2145
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_pcm_hardware *hw = &runtime->hw;
L
Linus Torvalds 已提交
2146 2147 2148 2149 2150 2151 2152
	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;
2153
	if (hw_support_mmap(substream)) {
L
Linus Torvalds 已提交
2154 2155 2156 2157 2158 2159 2160 2161
		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);
2162 2163
	if (err < 0)
		return err;
L
Linus Torvalds 已提交
2164 2165

	err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2166 2167
	if (err < 0)
		return err;
L
Linus Torvalds 已提交
2168 2169

	err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
2170 2171
	if (err < 0)
		return err;
L
Linus Torvalds 已提交
2172 2173 2174

	err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
					   hw->channels_min, hw->channels_max);
2175 2176
	if (err < 0)
		return err;
L
Linus Torvalds 已提交
2177 2178 2179

	err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
					   hw->rate_min, hw->rate_max);
2180 2181
	if (err < 0)
		return err;
L
Linus Torvalds 已提交
2182 2183 2184

	err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
					   hw->period_bytes_min, hw->period_bytes_max);
2185 2186
	if (err < 0)
		return err;
L
Linus Torvalds 已提交
2187 2188 2189

	err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
					   hw->periods_min, hw->periods_max);
2190 2191
	if (err < 0)
		return err;
L
Linus Torvalds 已提交
2192 2193 2194

	err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
					   hw->period_bytes_min, hw->buffer_bytes_max);
2195 2196
	if (err < 0)
		return err;
L
Linus Torvalds 已提交
2197 2198 2199 2200 2201 2202 2203 2204 2205 2206

	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);
2207
		if (err < 0)
2208
			return err;
L
Linus Torvalds 已提交
2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224
	}

	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;
}

2225
static void pcm_release_private(struct snd_pcm_substream *substream)
L
Linus Torvalds 已提交
2226 2227
{
	snd_pcm_unlink(substream);
2228 2229 2230 2231
}

void snd_pcm_release_substream(struct snd_pcm_substream *substream)
{
2232 2233 2234 2235
	substream->ref_count--;
	if (substream->ref_count > 0)
		return;

2236 2237
	snd_pcm_drop(substream);
	if (substream->hw_opened) {
2238 2239
		if (substream->ops->hw_free &&
		    substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
L
Linus Torvalds 已提交
2240 2241
			substream->ops->hw_free(substream);
		substream->ops->close(substream);
2242
		substream->hw_opened = 0;
L
Linus Torvalds 已提交
2243
	}
2244 2245
	if (pm_qos_request_active(&substream->latency_pm_qos_req))
		pm_qos_remove_request(&substream->latency_pm_qos_req);
2246 2247 2248 2249
	if (substream->pcm_release) {
		substream->pcm_release(substream);
		substream->pcm_release = NULL;
	}
2250 2251 2252
	snd_pcm_detach_substream(substream);
}

2253 2254
EXPORT_SYMBOL(snd_pcm_release_substream);

2255 2256 2257 2258 2259 2260 2261 2262 2263 2264
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;
2265 2266 2267 2268 2269
	if (substream->ref_count > 1) {
		*rsubstream = substream;
		return 0;
	}

2270 2271
	err = snd_pcm_hw_constraints_init(substream);
	if (err < 0) {
2272
		pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2273 2274 2275 2276 2277 2278 2279 2280 2281 2282
		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) {
2283
		pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2284 2285 2286 2287
		goto error;
	}

	*rsubstream = substream;
L
Linus Torvalds 已提交
2288
	return 0;
2289 2290 2291 2292

 error:
	snd_pcm_release_substream(substream);
	return err;
L
Linus Torvalds 已提交
2293 2294
}

2295 2296
EXPORT_SYMBOL(snd_pcm_open_substream);

L
Linus Torvalds 已提交
2297
static int snd_pcm_open_file(struct file *file,
T
Takashi Iwai 已提交
2298
			     struct snd_pcm *pcm,
2299
			     int stream)
L
Linus Torvalds 已提交
2300
{
T
Takashi Iwai 已提交
2301 2302
	struct snd_pcm_file *pcm_file;
	struct snd_pcm_substream *substream;
2303
	int err;
L
Linus Torvalds 已提交
2304

2305 2306 2307 2308
	err = snd_pcm_open_substream(pcm, stream, file, &substream);
	if (err < 0)
		return err;

2309 2310 2311 2312 2313 2314 2315
	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) {
2316 2317
		substream->file = pcm_file;
		substream->pcm_release = pcm_release_private;
L
Linus Torvalds 已提交
2318 2319
	}
	file->private_data = pcm_file;
2320

L
Linus Torvalds 已提交
2321 2322 2323
	return 0;
}

2324 2325 2326
static int snd_pcm_playback_open(struct inode *inode, struct file *file)
{
	struct snd_pcm *pcm;
T
Takashi Iwai 已提交
2327 2328 2329
	int err = nonseekable_open(inode, file);
	if (err < 0)
		return err;
2330 2331
	pcm = snd_lookup_minor_data(iminor(inode),
				    SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2332
	err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
T
Takashi Iwai 已提交
2333 2334
	if (pcm)
		snd_card_unref(pcm->card);
2335
	return err;
2336 2337 2338
}

static int snd_pcm_capture_open(struct inode *inode, struct file *file)
L
Linus Torvalds 已提交
2339
{
T
Takashi Iwai 已提交
2340
	struct snd_pcm *pcm;
T
Takashi Iwai 已提交
2341 2342 2343
	int err = nonseekable_open(inode, file);
	if (err < 0)
		return err;
2344 2345
	pcm = snd_lookup_minor_data(iminor(inode),
				    SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2346
	err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
T
Takashi Iwai 已提交
2347 2348
	if (pcm)
		snd_card_unref(pcm->card);
2349
	return err;
2350 2351 2352 2353 2354
}

static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
{
	int err;
L
Linus Torvalds 已提交
2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369
	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);
2370
	mutex_lock(&pcm->open_mutex);
L
Linus Torvalds 已提交
2371
	while (1) {
2372
		err = snd_pcm_open_file(file, pcm, stream);
L
Linus Torvalds 已提交
2373 2374 2375 2376 2377 2378 2379 2380 2381 2382
		if (err >= 0)
			break;
		if (err == -EAGAIN) {
			if (file->f_flags & O_NONBLOCK) {
				err = -EBUSY;
				break;
			}
		} else
			break;
		set_current_state(TASK_INTERRUPTIBLE);
2383
		mutex_unlock(&pcm->open_mutex);
L
Linus Torvalds 已提交
2384
		schedule();
2385
		mutex_lock(&pcm->open_mutex);
2386 2387 2388 2389
		if (pcm->card->shutdown) {
			err = -ENODEV;
			break;
		}
L
Linus Torvalds 已提交
2390 2391 2392 2393 2394 2395
		if (signal_pending(current)) {
			err = -ERESTARTSYS;
			break;
		}
	}
	remove_wait_queue(&pcm->open_wait, &wait);
2396
	mutex_unlock(&pcm->open_mutex);
L
Linus Torvalds 已提交
2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410
	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)
{
T
Takashi Iwai 已提交
2411 2412 2413
	struct snd_pcm *pcm;
	struct snd_pcm_substream *substream;
	struct snd_pcm_file *pcm_file;
L
Linus Torvalds 已提交
2414 2415 2416

	pcm_file = file->private_data;
	substream = pcm_file->substream;
2417 2418
	if (snd_BUG_ON(!substream))
		return -ENXIO;
L
Linus Torvalds 已提交
2419
	pcm = substream->pcm;
2420
	mutex_lock(&pcm->open_mutex);
2421
	snd_pcm_release_substream(substream);
2422
	kfree(pcm_file);
2423
	mutex_unlock(&pcm->open_mutex);
L
Linus Torvalds 已提交
2424 2425 2426 2427 2428 2429
	wake_up(&pcm->open_wait);
	module_put(pcm->card->module);
	snd_card_file_remove(pcm->card, file);
	return 0;
}

T
Takashi Iwai 已提交
2430 2431
static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
						 snd_pcm_uframes_t frames)
L
Linus Torvalds 已提交
2432
{
T
Takashi Iwai 已提交
2433
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452
	snd_pcm_sframes_t appl_ptr;
	snd_pcm_sframes_t ret;
	snd_pcm_sframes_t hw_avail;

	if (frames == 0)
		return 0;

	snd_pcm_stream_lock_irq(substream);
	switch (runtime->status->state) {
	case SNDRV_PCM_STATE_PREPARED:
		break;
	case SNDRV_PCM_STATE_DRAINING:
	case SNDRV_PCM_STATE_RUNNING:
		if (snd_pcm_update_hw_ptr(substream) >= 0)
			break;
		/* Fall through */
	case SNDRV_PCM_STATE_XRUN:
		ret = -EPIPE;
		goto __end;
2453 2454 2455
	case SNDRV_PCM_STATE_SUSPENDED:
		ret = -ESTRPIPE;
		goto __end;
L
Linus Torvalds 已提交
2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477
	default:
		ret = -EBADFD;
		goto __end;
	}

	hw_avail = snd_pcm_playback_hw_avail(runtime);
	if (hw_avail <= 0) {
		ret = 0;
		goto __end;
	}
	if (frames > (snd_pcm_uframes_t)hw_avail)
		frames = hw_avail;
	appl_ptr = runtime->control->appl_ptr - frames;
	if (appl_ptr < 0)
		appl_ptr += runtime->boundary;
	runtime->control->appl_ptr = appl_ptr;
	ret = frames;
 __end:
	snd_pcm_stream_unlock_irq(substream);
	return ret;
}

T
Takashi Iwai 已提交
2478 2479
static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
						snd_pcm_uframes_t frames)
L
Linus Torvalds 已提交
2480
{
T
Takashi Iwai 已提交
2481
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500
	snd_pcm_sframes_t appl_ptr;
	snd_pcm_sframes_t ret;
	snd_pcm_sframes_t hw_avail;

	if (frames == 0)
		return 0;

	snd_pcm_stream_lock_irq(substream);
	switch (runtime->status->state) {
	case SNDRV_PCM_STATE_PREPARED:
	case SNDRV_PCM_STATE_DRAINING:
		break;
	case SNDRV_PCM_STATE_RUNNING:
		if (snd_pcm_update_hw_ptr(substream) >= 0)
			break;
		/* Fall through */
	case SNDRV_PCM_STATE_XRUN:
		ret = -EPIPE;
		goto __end;
2501 2502 2503
	case SNDRV_PCM_STATE_SUSPENDED:
		ret = -ESTRPIPE;
		goto __end;
L
Linus Torvalds 已提交
2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525
	default:
		ret = -EBADFD;
		goto __end;
	}

	hw_avail = snd_pcm_capture_hw_avail(runtime);
	if (hw_avail <= 0) {
		ret = 0;
		goto __end;
	}
	if (frames > (snd_pcm_uframes_t)hw_avail)
		frames = hw_avail;
	appl_ptr = runtime->control->appl_ptr - frames;
	if (appl_ptr < 0)
		appl_ptr += runtime->boundary;
	runtime->control->appl_ptr = appl_ptr;
	ret = frames;
 __end:
	snd_pcm_stream_unlock_irq(substream);
	return ret;
}

T
Takashi Iwai 已提交
2526 2527
static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
						  snd_pcm_uframes_t frames)
L
Linus Torvalds 已提交
2528
{
T
Takashi Iwai 已提交
2529
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549
	snd_pcm_sframes_t appl_ptr;
	snd_pcm_sframes_t ret;
	snd_pcm_sframes_t avail;

	if (frames == 0)
		return 0;

	snd_pcm_stream_lock_irq(substream);
	switch (runtime->status->state) {
	case SNDRV_PCM_STATE_PREPARED:
	case SNDRV_PCM_STATE_PAUSED:
		break;
	case SNDRV_PCM_STATE_DRAINING:
	case SNDRV_PCM_STATE_RUNNING:
		if (snd_pcm_update_hw_ptr(substream) >= 0)
			break;
		/* Fall through */
	case SNDRV_PCM_STATE_XRUN:
		ret = -EPIPE;
		goto __end;
2550 2551 2552
	case SNDRV_PCM_STATE_SUSPENDED:
		ret = -ESTRPIPE;
		goto __end;
L
Linus Torvalds 已提交
2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574
	default:
		ret = -EBADFD;
		goto __end;
	}

	avail = snd_pcm_playback_avail(runtime);
	if (avail <= 0) {
		ret = 0;
		goto __end;
	}
	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;
	runtime->control->appl_ptr = appl_ptr;
	ret = frames;
 __end:
	snd_pcm_stream_unlock_irq(substream);
	return ret;
}

T
Takashi Iwai 已提交
2575 2576
static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
						 snd_pcm_uframes_t frames)
L
Linus Torvalds 已提交
2577
{
T
Takashi Iwai 已提交
2578
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598
	snd_pcm_sframes_t appl_ptr;
	snd_pcm_sframes_t ret;
	snd_pcm_sframes_t avail;

	if (frames == 0)
		return 0;

	snd_pcm_stream_lock_irq(substream);
	switch (runtime->status->state) {
	case SNDRV_PCM_STATE_PREPARED:
	case SNDRV_PCM_STATE_DRAINING:
	case SNDRV_PCM_STATE_PAUSED:
		break;
	case SNDRV_PCM_STATE_RUNNING:
		if (snd_pcm_update_hw_ptr(substream) >= 0)
			break;
		/* Fall through */
	case SNDRV_PCM_STATE_XRUN:
		ret = -EPIPE;
		goto __end;
2599 2600 2601
	case SNDRV_PCM_STATE_SUSPENDED:
		ret = -ESTRPIPE;
		goto __end;
L
Linus Torvalds 已提交
2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623
	default:
		ret = -EBADFD;
		goto __end;
	}

	avail = snd_pcm_capture_avail(runtime);
	if (avail <= 0) {
		ret = 0;
		goto __end;
	}
	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;
	runtime->control->appl_ptr = appl_ptr;
	ret = frames;
 __end:
	snd_pcm_stream_unlock_irq(substream);
	return ret;
}

T
Takashi Iwai 已提交
2624
static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
L
Linus Torvalds 已提交
2625
{
T
Takashi Iwai 已提交
2626
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
2627 2628 2629 2630 2631 2632 2633
	int err;

	snd_pcm_stream_lock_irq(substream);
	switch (runtime->status->state) {
	case SNDRV_PCM_STATE_DRAINING:
		if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
			goto __badfd;
T
Takashi Iwai 已提交
2634
		/* Fall through */
L
Linus Torvalds 已提交
2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654
	case SNDRV_PCM_STATE_RUNNING:
		if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
			break;
		/* Fall through */
	case SNDRV_PCM_STATE_PREPARED:
	case SNDRV_PCM_STATE_SUSPENDED:
		err = 0;
		break;
	case SNDRV_PCM_STATE_XRUN:
		err = -EPIPE;
		break;
	default:
	      __badfd:
		err = -EBADFD;
		break;
	}
	snd_pcm_stream_unlock_irq(substream);
	return err;
}
		
T
Takashi Iwai 已提交
2655 2656
static int snd_pcm_delay(struct snd_pcm_substream *substream,
			 snd_pcm_sframes_t __user *res)
L
Linus Torvalds 已提交
2657
{
T
Takashi Iwai 已提交
2658
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
2659 2660 2661 2662 2663 2664 2665 2666
	int err;
	snd_pcm_sframes_t n = 0;

	snd_pcm_stream_lock_irq(substream);
	switch (runtime->status->state) {
	case SNDRV_PCM_STATE_DRAINING:
		if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
			goto __badfd;
T
Takashi Iwai 已提交
2667
		/* Fall through */
L
Linus Torvalds 已提交
2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678
	case SNDRV_PCM_STATE_RUNNING:
		if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
			break;
		/* Fall through */
	case SNDRV_PCM_STATE_PREPARED:
	case SNDRV_PCM_STATE_SUSPENDED:
		err = 0;
		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
			n = snd_pcm_playback_hw_avail(runtime);
		else
			n = snd_pcm_capture_avail(runtime);
2679
		n += runtime->delay;
L
Linus Torvalds 已提交
2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695
		break;
	case SNDRV_PCM_STATE_XRUN:
		err = -EPIPE;
		break;
	default:
	      __badfd:
		err = -EBADFD;
		break;
	}
	snd_pcm_stream_unlock_irq(substream);
	if (!err)
		if (put_user(n, res))
			err = -EFAULT;
	return err;
}
		
T
Takashi Iwai 已提交
2696 2697
static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
			    struct snd_pcm_sync_ptr __user *_sync_ptr)
L
Linus Torvalds 已提交
2698
{
T
Takashi Iwai 已提交
2699 2700 2701 2702
	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;
L
Linus Torvalds 已提交
2703 2704 2705 2706 2707
	int err;

	memset(&sync_ptr, 0, sizeof(sync_ptr));
	if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
		return -EFAULT;
T
Takashi Iwai 已提交
2708
	if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
L
Linus Torvalds 已提交
2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734
		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);
	if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
		control->appl_ptr = sync_ptr.c.control.appl_ptr;
	else
		sync_ptr.c.control.appl_ptr = control->appl_ptr;
	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;
}
2735 2736 2737 2738 2739 2740 2741 2742 2743 2744

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;
2745
	runtime->tstamp_type = arg;
2746 2747
	return 0;
}
L
Linus Torvalds 已提交
2748
		
2749 2750
static int snd_pcm_common_ioctl1(struct file *file,
				 struct snd_pcm_substream *substream,
L
Linus Torvalds 已提交
2751 2752 2753 2754 2755 2756 2757
				 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);
2758 2759
	case SNDRV_PCM_IOCTL_TSTAMP:	/* just for compatibility */
		return 0;
2760 2761
	case SNDRV_PCM_IOCTL_TTSTAMP:
		return snd_pcm_tstamp(substream, arg);
L
Linus Torvalds 已提交
2762 2763 2764 2765 2766 2767 2768 2769 2770
	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:
2771 2772 2773
		return snd_pcm_status_user(substream, arg, false);
	case SNDRV_PCM_IOCTL_STATUS_EXT:
		return snd_pcm_status_user(substream, arg, true);
L
Linus Torvalds 已提交
2774 2775 2776
	case SNDRV_PCM_IOCTL_CHANNEL_INFO:
		return snd_pcm_channel_info_user(substream, arg);
	case SNDRV_PCM_IOCTL_PREPARE:
2777
		return snd_pcm_prepare(substream, file);
L
Linus Torvalds 已提交
2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795
	case SNDRV_PCM_IOCTL_RESET:
		return snd_pcm_reset(substream);
	case SNDRV_PCM_IOCTL_START:
		return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
	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:
		return snd_pcm_delay(substream, arg);
	case SNDRV_PCM_IOCTL_SYNC_PTR:
		return snd_pcm_sync_ptr(substream, arg);
2796
#ifdef CONFIG_SND_SUPPORT_OLD_API
L
Linus Torvalds 已提交
2797 2798 2799 2800
	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);
2801
#endif
L
Linus Torvalds 已提交
2802
	case SNDRV_PCM_IOCTL_DRAIN:
2803
		return snd_pcm_drain(substream, file);
L
Linus Torvalds 已提交
2804 2805
	case SNDRV_PCM_IOCTL_DROP:
		return snd_pcm_drop(substream);
2806 2807 2808 2809 2810 2811 2812 2813
	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;
	}
L
Linus Torvalds 已提交
2814
	}
2815
	pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
L
Linus Torvalds 已提交
2816 2817 2818
	return -ENOTTY;
}

2819 2820
static int snd_pcm_playback_ioctl1(struct file *file,
				   struct snd_pcm_substream *substream,
L
Linus Torvalds 已提交
2821 2822
				   unsigned int cmd, void __user *arg)
{
2823 2824 2825 2826
	if (snd_BUG_ON(!substream))
		return -ENXIO;
	if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
		return -EINVAL;
L
Linus Torvalds 已提交
2827 2828 2829
	switch (cmd) {
	case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
	{
T
Takashi Iwai 已提交
2830 2831 2832
		struct snd_xferi xferi;
		struct snd_xferi __user *_xferi = arg;
		struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845
		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:
	{
T
Takashi Iwai 已提交
2846 2847 2848
		struct snd_xfern xfern;
		struct snd_xfern __user *_xfern = arg;
		struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
2849 2850 2851 2852 2853 2854 2855 2856 2857 2858
		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;
L
Li Zefan 已提交
2859 2860 2861 2862 2863

		bufs = memdup_user(xfern.bufs,
				   sizeof(void *) * runtime->channels);
		if (IS_ERR(bufs))
			return PTR_ERR(bufs);
L
Linus Torvalds 已提交
2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895
		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;
	}
	}
2896
	return snd_pcm_common_ioctl1(file, substream, cmd, arg);
L
Linus Torvalds 已提交
2897 2898
}

2899 2900
static int snd_pcm_capture_ioctl1(struct file *file,
				  struct snd_pcm_substream *substream,
L
Linus Torvalds 已提交
2901 2902
				  unsigned int cmd, void __user *arg)
{
2903 2904 2905 2906
	if (snd_BUG_ON(!substream))
		return -ENXIO;
	if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
		return -EINVAL;
L
Linus Torvalds 已提交
2907 2908 2909
	switch (cmd) {
	case SNDRV_PCM_IOCTL_READI_FRAMES:
	{
T
Takashi Iwai 已提交
2910 2911 2912
		struct snd_xferi xferi;
		struct snd_xferi __user *_xferi = arg;
		struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925
		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:
	{
T
Takashi Iwai 已提交
2926 2927 2928
		struct snd_xfern xfern;
		struct snd_xfern __user *_xfern = arg;
		struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
2929 2930 2931 2932 2933 2934 2935 2936 2937 2938
		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;
L
Li Zefan 已提交
2939 2940 2941 2942 2943

		bufs = memdup_user(xfern.bufs,
				   sizeof(void *) * runtime->channels);
		if (IS_ERR(bufs))
			return PTR_ERR(bufs);
L
Linus Torvalds 已提交
2944 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
		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;
	}
	}
2976
	return snd_pcm_common_ioctl1(file, substream, cmd, arg);
L
Linus Torvalds 已提交
2977 2978
}

T
Takashi Iwai 已提交
2979 2980
static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
				   unsigned long arg)
L
Linus Torvalds 已提交
2981
{
T
Takashi Iwai 已提交
2982
	struct snd_pcm_file *pcm_file;
L
Linus Torvalds 已提交
2983 2984 2985 2986 2987 2988

	pcm_file = file->private_data;

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

2989 2990
	return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
				       (void __user *)arg);
L
Linus Torvalds 已提交
2991 2992
}

T
Takashi Iwai 已提交
2993 2994
static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
				  unsigned long arg)
L
Linus Torvalds 已提交
2995
{
T
Takashi Iwai 已提交
2996
	struct snd_pcm_file *pcm_file;
L
Linus Torvalds 已提交
2997 2998 2999 3000 3001 3002

	pcm_file = file->private_data;

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

3003 3004
	return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
				      (void __user *)arg);
L
Linus Torvalds 已提交
3005 3006
}

T
Takashi Iwai 已提交
3007 3008
int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
			 unsigned int cmd, void *arg)
L
Linus Torvalds 已提交
3009 3010 3011 3012 3013 3014 3015
{
	mm_segment_t fs;
	int result;
	
	fs = snd_enter_user();
	switch (substream->stream) {
	case SNDRV_PCM_STREAM_PLAYBACK:
3016 3017
		result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
						 (void __user *)arg);
T
Takashi Iwai 已提交
3018
		break;
L
Linus Torvalds 已提交
3019
	case SNDRV_PCM_STREAM_CAPTURE:
3020 3021
		result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
						(void __user *)arg);
T
Takashi Iwai 已提交
3022
		break;
L
Linus Torvalds 已提交
3023
	default:
T
Takashi Iwai 已提交
3024 3025
		result = -EINVAL;
		break;
L
Linus Torvalds 已提交
3026
	}
T
Takashi Iwai 已提交
3027 3028
	snd_leave_user(fs);
	return result;
L
Linus Torvalds 已提交
3029 3030
}

3031 3032
EXPORT_SYMBOL(snd_pcm_kernel_ioctl);

T
Takashi Iwai 已提交
3033 3034
static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
			    loff_t * offset)
L
Linus Torvalds 已提交
3035
{
T
Takashi Iwai 已提交
3036 3037 3038
	struct snd_pcm_file *pcm_file;
	struct snd_pcm_substream *substream;
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
3039 3040 3041 3042
	snd_pcm_sframes_t result;

	pcm_file = file->private_data;
	substream = pcm_file->substream;
3043 3044
	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
L
Linus Torvalds 已提交
3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056
	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;
}

T
Takashi Iwai 已提交
3057 3058
static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
			     size_t count, loff_t * offset)
L
Linus Torvalds 已提交
3059
{
T
Takashi Iwai 已提交
3060 3061 3062
	struct snd_pcm_file *pcm_file;
	struct snd_pcm_substream *substream;
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
3063 3064 3065 3066
	snd_pcm_sframes_t result;

	pcm_file = file->private_data;
	substream = pcm_file->substream;
3067 3068
	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
L
Linus Torvalds 已提交
3069
	runtime = substream->runtime;
3070 3071 3072 3073
	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
		return -EBADFD;
	if (!frame_aligned(runtime, count))
		return -EINVAL;
L
Linus Torvalds 已提交
3074 3075 3076 3077 3078 3079 3080
	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;
}

A
Al Viro 已提交
3081
static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to)
L
Linus Torvalds 已提交
3082
{
T
Takashi Iwai 已提交
3083 3084 3085
	struct snd_pcm_file *pcm_file;
	struct snd_pcm_substream *substream;
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
3086 3087 3088 3089 3090
	snd_pcm_sframes_t result;
	unsigned long i;
	void __user **bufs;
	snd_pcm_uframes_t frames;

3091
	pcm_file = iocb->ki_filp->private_data;
L
Linus Torvalds 已提交
3092
	substream = pcm_file->substream;
3093 3094
	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
L
Linus Torvalds 已提交
3095 3096 3097
	runtime = substream->runtime;
	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
		return -EBADFD;
A
Al Viro 已提交
3098 3099 3100
	if (!iter_is_iovec(to))
		return -EINVAL;
	if (to->nr_segs > 1024 || to->nr_segs != runtime->channels)
L
Linus Torvalds 已提交
3101
		return -EINVAL;
A
Al Viro 已提交
3102
	if (!frame_aligned(runtime, to->iov->iov_len))
L
Linus Torvalds 已提交
3103
		return -EINVAL;
A
Al Viro 已提交
3104 3105
	frames = bytes_to_samples(runtime, to->iov->iov_len);
	bufs = kmalloc(sizeof(void *) * to->nr_segs, GFP_KERNEL);
L
Linus Torvalds 已提交
3106 3107
	if (bufs == NULL)
		return -ENOMEM;
A
Al Viro 已提交
3108 3109
	for (i = 0; i < to->nr_segs; ++i)
		bufs[i] = to->iov[i].iov_base;
L
Linus Torvalds 已提交
3110 3111 3112 3113 3114 3115 3116
	result = snd_pcm_lib_readv(substream, bufs, frames);
	if (result > 0)
		result = frames_to_bytes(runtime, result);
	kfree(bufs);
	return result;
}

A
Al Viro 已提交
3117
static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from)
L
Linus Torvalds 已提交
3118
{
T
Takashi Iwai 已提交
3119 3120 3121
	struct snd_pcm_file *pcm_file;
	struct snd_pcm_substream *substream;
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
3122 3123 3124 3125 3126
	snd_pcm_sframes_t result;
	unsigned long i;
	void __user **bufs;
	snd_pcm_uframes_t frames;

3127
	pcm_file = iocb->ki_filp->private_data;
L
Linus Torvalds 已提交
3128
	substream = pcm_file->substream;
3129 3130
	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
L
Linus Torvalds 已提交
3131
	runtime = substream->runtime;
3132 3133
	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
		return -EBADFD;
A
Al Viro 已提交
3134 3135 3136 3137
	if (!iter_is_iovec(from))
		return -EINVAL;
	if (from->nr_segs > 128 || from->nr_segs != runtime->channels ||
	    !frame_aligned(runtime, from->iov->iov_len))
3138
		return -EINVAL;
A
Al Viro 已提交
3139 3140
	frames = bytes_to_samples(runtime, from->iov->iov_len);
	bufs = kmalloc(sizeof(void *) * from->nr_segs, GFP_KERNEL);
L
Linus Torvalds 已提交
3141 3142
	if (bufs == NULL)
		return -ENOMEM;
A
Al Viro 已提交
3143 3144
	for (i = 0; i < from->nr_segs; ++i)
		bufs[i] = from->iov[i].iov_base;
L
Linus Torvalds 已提交
3145 3146 3147 3148 3149 3150 3151 3152 3153
	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)
{
T
Takashi Iwai 已提交
3154 3155 3156
	struct snd_pcm_file *pcm_file;
	struct snd_pcm_substream *substream;
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
3157 3158 3159 3160 3161 3162
        unsigned int mask;
	snd_pcm_uframes_t avail;

	pcm_file = file->private_data;

	substream = pcm_file->substream;
3163 3164
	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
L
Linus Torvalds 已提交
3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192
	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)
{
T
Takashi Iwai 已提交
3193 3194 3195
	struct snd_pcm_file *pcm_file;
	struct snd_pcm_substream *substream;
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
3196 3197 3198 3199 3200 3201
        unsigned int mask;
	snd_pcm_uframes_t avail;

	pcm_file = file->private_data;

	substream = pcm_file->substream;
3202 3203
	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
L
Linus Torvalds 已提交
3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245
	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
 */
N
Nick Piggin 已提交
3246 3247
static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
						struct vm_fault *vmf)
L
Linus Torvalds 已提交
3248
{
T
Takashi Iwai 已提交
3249 3250
	struct snd_pcm_substream *substream = area->vm_private_data;
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
3251 3252
	
	if (substream == NULL)
N
Nick Piggin 已提交
3253
		return VM_FAULT_SIGBUS;
L
Linus Torvalds 已提交
3254
	runtime = substream->runtime;
N
Nick Piggin 已提交
3255 3256 3257
	vmf->page = virt_to_page(runtime->status);
	get_page(vmf->page);
	return 0;
L
Linus Torvalds 已提交
3258 3259
}

3260
static const struct vm_operations_struct snd_pcm_vm_ops_status =
L
Linus Torvalds 已提交
3261
{
N
Nick Piggin 已提交
3262
	.fault =	snd_pcm_mmap_status_fault,
L
Linus Torvalds 已提交
3263 3264
};

T
Takashi Iwai 已提交
3265
static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
L
Linus Torvalds 已提交
3266 3267 3268 3269 3270 3271
			       struct vm_area_struct *area)
{
	long size;
	if (!(area->vm_flags & VM_READ))
		return -EINVAL;
	size = area->vm_end - area->vm_start;
T
Takashi Iwai 已提交
3272
	if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
L
Linus Torvalds 已提交
3273 3274 3275
		return -EINVAL;
	area->vm_ops = &snd_pcm_vm_ops_status;
	area->vm_private_data = substream;
3276
	area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
L
Linus Torvalds 已提交
3277 3278 3279 3280 3281 3282
	return 0;
}

/*
 * mmap control record
 */
N
Nick Piggin 已提交
3283 3284
static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
						struct vm_fault *vmf)
L
Linus Torvalds 已提交
3285
{
T
Takashi Iwai 已提交
3286 3287
	struct snd_pcm_substream *substream = area->vm_private_data;
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
3288 3289
	
	if (substream == NULL)
N
Nick Piggin 已提交
3290
		return VM_FAULT_SIGBUS;
L
Linus Torvalds 已提交
3291
	runtime = substream->runtime;
N
Nick Piggin 已提交
3292 3293 3294
	vmf->page = virt_to_page(runtime->control);
	get_page(vmf->page);
	return 0;
L
Linus Torvalds 已提交
3295 3296
}

3297
static const struct vm_operations_struct snd_pcm_vm_ops_control =
L
Linus Torvalds 已提交
3298
{
N
Nick Piggin 已提交
3299
	.fault =	snd_pcm_mmap_control_fault,
L
Linus Torvalds 已提交
3300 3301
};

T
Takashi Iwai 已提交
3302
static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
L
Linus Torvalds 已提交
3303 3304 3305 3306 3307 3308
				struct vm_area_struct *area)
{
	long size;
	if (!(area->vm_flags & VM_READ))
		return -EINVAL;
	size = area->vm_end - area->vm_start;
T
Takashi Iwai 已提交
3309
	if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
L
Linus Torvalds 已提交
3310 3311 3312
		return -EINVAL;
	area->vm_ops = &snd_pcm_vm_ops_control;
	area->vm_private_data = substream;
3313
	area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
L
Linus Torvalds 已提交
3314 3315 3316 3317 3318 3319
	return 0;
}
#else /* ! coherent mmap */
/*
 * don't support mmap for status and control records.
 */
T
Takashi Iwai 已提交
3320
static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
L
Linus Torvalds 已提交
3321 3322 3323 3324
			       struct vm_area_struct *area)
{
	return -ENXIO;
}
T
Takashi Iwai 已提交
3325
static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
L
Linus Torvalds 已提交
3326 3327 3328 3329 3330 3331
				struct vm_area_struct *area)
{
	return -ENXIO;
}
#endif /* coherent mmap */

3332 3333 3334 3335 3336 3337 3338
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);
}

L
Linus Torvalds 已提交
3339
/*
N
Nick Piggin 已提交
3340
 * fault callback for mmapping a RAM page
L
Linus Torvalds 已提交
3341
 */
N
Nick Piggin 已提交
3342 3343
static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
						struct vm_fault *vmf)
L
Linus Torvalds 已提交
3344
{
T
Takashi Iwai 已提交
3345 3346
	struct snd_pcm_substream *substream = area->vm_private_data;
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
3347 3348 3349 3350 3351
	unsigned long offset;
	struct page * page;
	size_t dma_bytes;
	
	if (substream == NULL)
N
Nick Piggin 已提交
3352
		return VM_FAULT_SIGBUS;
L
Linus Torvalds 已提交
3353
	runtime = substream->runtime;
N
Nick Piggin 已提交
3354
	offset = vmf->pgoff << PAGE_SHIFT;
L
Linus Torvalds 已提交
3355 3356
	dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
	if (offset > dma_bytes - PAGE_SIZE)
N
Nick Piggin 已提交
3357
		return VM_FAULT_SIGBUS;
3358
	if (substream->ops->page)
L
Linus Torvalds 已提交
3359
		page = substream->ops->page(substream, offset);
3360 3361 3362 3363
	else
		page = snd_pcm_default_page_ops(substream, offset);
	if (!page)
		return VM_FAULT_SIGBUS;
N
Nick Piggin 已提交
3364
	get_page(page);
N
Nick Piggin 已提交
3365 3366
	vmf->page = page;
	return 0;
L
Linus Torvalds 已提交
3367 3368
}

3369 3370 3371 3372 3373 3374
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 = {
L
Linus Torvalds 已提交
3375 3376
	.open =		snd_pcm_mmap_data_open,
	.close =	snd_pcm_mmap_data_close,
N
Nick Piggin 已提交
3377
	.fault =	snd_pcm_mmap_data_fault,
L
Linus Torvalds 已提交
3378 3379 3380 3381 3382
};

/*
 * mmap the DMA buffer on RAM
 */
T
Takashi Iwai 已提交
3383 3384 3385 3386 3387 3388 3389 3390 3391

/**
 * 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.
 */
3392 3393
int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
			     struct vm_area_struct *area)
L
Linus Torvalds 已提交
3394
{
3395
	area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3396
#ifdef CONFIG_GENERIC_ALLOCATOR
3397 3398 3399 3400 3401 3402
	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);
	}
3403
#endif /* CONFIG_GENERIC_ALLOCATOR */
3404
#ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */
3405 3406 3407 3408 3409 3410 3411
	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);
3412
#endif /* CONFIG_X86 */
3413 3414
	/* mmap with fault handler */
	area->vm_ops = &snd_pcm_vm_ops_data_fault;
L
Linus Torvalds 已提交
3415 3416
	return 0;
}
3417
EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
L
Linus Torvalds 已提交
3418 3419 3420 3421 3422

/*
 * mmap the DMA buffer on I/O memory area
 */
#if SNDRV_PCM_INFO_MMAP_IOMEM
T
Takashi Iwai 已提交
3423 3424 3425 3426 3427 3428 3429 3430 3431
/**
 * 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.
 */
T
Takashi Iwai 已提交
3432 3433
int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
			   struct vm_area_struct *area)
L
Linus Torvalds 已提交
3434
{
3435
	struct snd_pcm_runtime *runtime = substream->runtime;;
L
Linus Torvalds 已提交
3436 3437

	area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3438
	return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
L
Linus Torvalds 已提交
3439
}
3440 3441

EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
L
Linus Torvalds 已提交
3442 3443 3444 3445 3446
#endif /* SNDRV_PCM_INFO_MMAP */

/*
 * mmap DMA buffer
 */
T
Takashi Iwai 已提交
3447
int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
L
Linus Torvalds 已提交
3448 3449
		      struct vm_area_struct *area)
{
T
Takashi Iwai 已提交
3450
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
3451 3452 3453
	long size;
	unsigned long offset;
	size_t dma_bytes;
3454
	int err;
L
Linus Torvalds 已提交
3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475 3476 3477 3478

	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;

3479 3480
	area->vm_ops = &snd_pcm_vm_ops_data;
	area->vm_private_data = substream;
L
Linus Torvalds 已提交
3481
	if (substream->ops->mmap)
3482
		err = substream->ops->mmap(substream, area);
L
Linus Torvalds 已提交
3483
	else
3484
		err = snd_pcm_lib_default_mmap(substream, area);
3485 3486 3487
	if (!err)
		atomic_inc(&substream->mmap_count);
	return err;
L
Linus Torvalds 已提交
3488 3489
}

3490 3491
EXPORT_SYMBOL(snd_pcm_mmap_data);

L
Linus Torvalds 已提交
3492 3493
static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
{
T
Takashi Iwai 已提交
3494 3495
	struct snd_pcm_file * pcm_file;
	struct snd_pcm_substream *substream;	
L
Linus Torvalds 已提交
3496 3497 3498 3499
	unsigned long offset;
	
	pcm_file = file->private_data;
	substream = pcm_file->substream;
3500 3501
	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
L
Linus Torvalds 已提交
3502 3503 3504 3505

	offset = area->vm_pgoff << PAGE_SHIFT;
	switch (offset) {
	case SNDRV_PCM_MMAP_OFFSET_STATUS:
3506
		if (pcm_file->no_compat_mmap)
L
Linus Torvalds 已提交
3507 3508 3509
			return -ENXIO;
		return snd_pcm_mmap_status(substream, file, area);
	case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3510
		if (pcm_file->no_compat_mmap)
L
Linus Torvalds 已提交
3511 3512 3513 3514 3515 3516 3517 3518 3519 3520
			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)
{
T
Takashi Iwai 已提交
3521 3522 3523
	struct snd_pcm_file * pcm_file;
	struct snd_pcm_substream *substream;
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
3524 3525 3526

	pcm_file = file->private_data;
	substream = pcm_file->substream;
3527
	if (PCM_RUNTIME_CHECK(substream))
3528
		return -ENXIO;
L
Linus Torvalds 已提交
3529
	runtime = substream->runtime;
3530
	return fasync_helper(fd, file, on, &runtime->fasync);
L
Linus Torvalds 已提交
3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545
}

/*
 * 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
 */

3546
#ifdef CONFIG_SND_SUPPORT_OLD_API
L
Linus Torvalds 已提交
3547 3548 3549
#define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
#define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))

T
Takashi Iwai 已提交
3550 3551
static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
					       struct snd_pcm_hw_params_old *oparams)
L
Linus Torvalds 已提交
3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568
{
	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;
}

T
Takashi Iwai 已提交
3569 3570
static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
					     struct snd_pcm_hw_params *params)
L
Linus Torvalds 已提交
3571 3572 3573 3574 3575 3576 3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587
{
	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;
}

T
Takashi Iwai 已提交
3588 3589
static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
				      struct snd_pcm_hw_params_old __user * _oparams)
L
Linus Torvalds 已提交
3590
{
T
Takashi Iwai 已提交
3591 3592
	struct snd_pcm_hw_params *params;
	struct snd_pcm_hw_params_old *oparams = NULL;
L
Linus Torvalds 已提交
3593 3594 3595
	int err;

	params = kmalloc(sizeof(*params), GFP_KERNEL);
L
Li Zefan 已提交
3596 3597
	if (!params)
		return -ENOMEM;
L
Linus Torvalds 已提交
3598

L
Li Zefan 已提交
3599 3600 3601
	oparams = memdup_user(_oparams, sizeof(*oparams));
	if (IS_ERR(oparams)) {
		err = PTR_ERR(oparams);
L
Linus Torvalds 已提交
3602 3603 3604 3605 3606 3607 3608 3609 3610
		goto out;
	}
	snd_pcm_hw_convert_from_old_params(params, oparams);
	err = snd_pcm_hw_refine(substream, params);
	snd_pcm_hw_convert_to_old_params(oparams, params);
	if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
		if (!err)
			err = -EFAULT;
	}
L
Li Zefan 已提交
3611 3612

	kfree(oparams);
L
Linus Torvalds 已提交
3613 3614 3615 3616 3617
out:
	kfree(params);
	return err;
}

T
Takashi Iwai 已提交
3618 3619
static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
				      struct snd_pcm_hw_params_old __user * _oparams)
L
Linus Torvalds 已提交
3620
{
T
Takashi Iwai 已提交
3621 3622
	struct snd_pcm_hw_params *params;
	struct snd_pcm_hw_params_old *oparams = NULL;
L
Linus Torvalds 已提交
3623 3624 3625
	int err;

	params = kmalloc(sizeof(*params), GFP_KERNEL);
L
Li Zefan 已提交
3626 3627 3628 3629 3630 3631
	if (!params)
		return -ENOMEM;

	oparams = memdup_user(_oparams, sizeof(*oparams));
	if (IS_ERR(oparams)) {
		err = PTR_ERR(oparams);
L
Linus Torvalds 已提交
3632 3633 3634 3635 3636 3637 3638 3639 3640
		goto out;
	}
	snd_pcm_hw_convert_from_old_params(params, oparams);
	err = snd_pcm_hw_params(substream, params);
	snd_pcm_hw_convert_to_old_params(oparams, params);
	if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
		if (!err)
			err = -EFAULT;
	}
L
Li Zefan 已提交
3641 3642

	kfree(oparams);
L
Linus Torvalds 已提交
3643 3644 3645 3646
out:
	kfree(params);
	return err;
}
3647
#endif /* CONFIG_SND_SUPPORT_OLD_API */
L
Linus Torvalds 已提交
3648

3649
#ifndef CONFIG_MMU
3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 3665 3666 3667 3668
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;
	}
3669 3670
}
#else
3671
# define snd_pcm_get_unmapped_area NULL
3672 3673
#endif

L
Linus Torvalds 已提交
3674 3675 3676 3677
/*
 *  Register section
 */

3678
const struct file_operations snd_pcm_f_ops[2] = {
L
Linus Torvalds 已提交
3679
	{
3680 3681
		.owner =		THIS_MODULE,
		.write =		snd_pcm_write,
A
Al Viro 已提交
3682
		.write_iter =		snd_pcm_writev,
3683
		.open =			snd_pcm_playback_open,
3684
		.release =		snd_pcm_release,
T
Takashi Iwai 已提交
3685
		.llseek =		no_llseek,
3686 3687 3688 3689 3690
		.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,
3691
		.get_unmapped_area =	snd_pcm_get_unmapped_area,
L
Linus Torvalds 已提交
3692 3693
	},
	{
3694 3695
		.owner =		THIS_MODULE,
		.read =			snd_pcm_read,
A
Al Viro 已提交
3696
		.read_iter =		snd_pcm_readv,
3697
		.open =			snd_pcm_capture_open,
3698
		.release =		snd_pcm_release,
T
Takashi Iwai 已提交
3699
		.llseek =		no_llseek,
3700 3701 3702 3703 3704
		.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,
3705
		.get_unmapped_area =	snd_pcm_get_unmapped_area,
L
Linus Torvalds 已提交
3706 3707
	}
};