pcm_lib.c 54.4 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 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
 *                   Abramo Bagnara <abramo@alsa-project.org>
 *
 *
 *   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/slab.h>
#include <linux/time.h>
#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>

/*
 * fill ring buffer with silence
 * runtime->silence_start: starting pointer to silence area
 * runtime->silence_filled: size filled with silence
 * runtime->silence_threshold: threshold from application
 * runtime->silence_size: maximal size from application
 *
 * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately
 */
T
Takashi Iwai 已提交
41
void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr)
L
Linus Torvalds 已提交
42
{
T
Takashi Iwai 已提交
43
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
44 45 46 47 48 49 50 51 52 53 54 55 56 57
	snd_pcm_uframes_t frames, ofs, transfer;

	if (runtime->silence_size < runtime->boundary) {
		snd_pcm_sframes_t noise_dist, n;
		if (runtime->silence_start != runtime->control->appl_ptr) {
			n = runtime->control->appl_ptr - runtime->silence_start;
			if (n < 0)
				n += runtime->boundary;
			if ((snd_pcm_uframes_t)n < runtime->silence_filled)
				runtime->silence_filled -= n;
			else
				runtime->silence_filled = 0;
			runtime->silence_start = runtime->control->appl_ptr;
		}
T
Takashi Iwai 已提交
58
		if (runtime->silence_filled >= runtime->buffer_size)
L
Linus Torvalds 已提交
59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80
			return;
		noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
		if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold)
			return;
		frames = runtime->silence_threshold - noise_dist;
		if (frames > runtime->silence_size)
			frames = runtime->silence_size;
	} else {
		if (new_hw_ptr == ULONG_MAX) {	/* initialization */
			snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime);
			runtime->silence_filled = avail > 0 ? avail : 0;
			runtime->silence_start = (runtime->status->hw_ptr +
						  runtime->silence_filled) %
						 runtime->boundary;
		} else {
			ofs = runtime->status->hw_ptr;
			frames = new_hw_ptr - ofs;
			if ((snd_pcm_sframes_t)frames < 0)
				frames += runtime->boundary;
			runtime->silence_filled -= frames;
			if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
				runtime->silence_filled = 0;
81
				runtime->silence_start = new_hw_ptr;
L
Linus Torvalds 已提交
82
			} else {
83
				runtime->silence_start = ofs;
L
Linus Torvalds 已提交
84 85 86 87
			}
		}
		frames = runtime->buffer_size - runtime->silence_filled;
	}
88 89
	if (snd_BUG_ON(frames > runtime->buffer_size))
		return;
L
Linus Torvalds 已提交
90 91
	if (frames == 0)
		return;
92
	ofs = runtime->silence_start % runtime->buffer_size;
L
Linus Torvalds 已提交
93 94 95 96 97 98 99
	while (frames > 0) {
		transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
		if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
		    runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) {
			if (substream->ops->silence) {
				int err;
				err = substream->ops->silence(substream, -1, ofs, transfer);
100
				snd_BUG_ON(err < 0);
L
Linus Torvalds 已提交
101 102 103 104 105 106 107 108 109 110 111
			} else {
				char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs);
				snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels);
			}
		} else {
			unsigned int c;
			unsigned int channels = runtime->channels;
			if (substream->ops->silence) {
				for (c = 0; c < channels; ++c) {
					int err;
					err = substream->ops->silence(substream, c, ofs, transfer);
112
					snd_BUG_ON(err < 0);
L
Linus Torvalds 已提交
113 114 115 116 117 118 119 120 121 122 123 124 125 126 127
				}
			} else {
				size_t dma_csize = runtime->dma_bytes / channels;
				for (c = 0; c < channels; ++c) {
					char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs);
					snd_pcm_format_set_silence(runtime->format, hwbuf, transfer);
				}
			}
		}
		runtime->silence_filled += transfer;
		frames -= transfer;
		ofs = 0;
	}
}

T
Takashi Iwai 已提交
128 129 130 131 132 133 134 135 136 137 138
#ifdef CONFIG_SND_PCM_XRUN_DEBUG
#define xrun_debug(substream)	((substream)->pstr->xrun_debug)
#else
#define xrun_debug(substream)	0
#endif

#define dump_stack_on_xrun(substream) do {	\
		if (xrun_debug(substream) > 1)	\
			dump_stack();		\
	} while (0)

T
Takashi Iwai 已提交
139
static void xrun(struct snd_pcm_substream *substream)
L
Linus Torvalds 已提交
140 141
{
	snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
T
Takashi Iwai 已提交
142
	if (xrun_debug(substream)) {
L
Linus Torvalds 已提交
143 144 145 146
		snd_printd(KERN_DEBUG "XRUN: pcmC%dD%d%c\n",
			   substream->pcm->card->number,
			   substream->pcm->device,
			   substream->stream ? 'c' : 'p');
T
Takashi Iwai 已提交
147
		dump_stack_on_xrun(substream);
L
Linus Torvalds 已提交
148 149 150
	}
}

151 152 153
static snd_pcm_uframes_t
snd_pcm_update_hw_ptr_pos(struct snd_pcm_substream *substream,
			  struct snd_pcm_runtime *runtime)
L
Linus Torvalds 已提交
154 155 156
{
	snd_pcm_uframes_t pos;

157 158
	if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
		snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
L
Linus Torvalds 已提交
159 160 161 162
	pos = substream->ops->pointer(substream);
	if (pos == SNDRV_PCM_POS_XRUN)
		return pos; /* XRUN */
	if (pos >= runtime->buffer_size) {
163 164 165 166 167 168 169
		if (printk_ratelimit()) {
			snd_printd(KERN_ERR  "BUG: stream = %i, pos = 0x%lx, "
				   "buffer size = 0x%lx, period size = 0x%lx\n",
				   substream->stream, pos, runtime->buffer_size,
				   runtime->period_size);
		}
		pos = 0;
170
	}
L
Linus Torvalds 已提交
171 172 173 174
	pos -= pos % runtime->min_align;
	return pos;
}

175 176
static int snd_pcm_update_hw_ptr_post(struct snd_pcm_substream *substream,
				      struct snd_pcm_runtime *runtime)
L
Linus Torvalds 已提交
177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197
{
	snd_pcm_uframes_t avail;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		avail = snd_pcm_playback_avail(runtime);
	else
		avail = snd_pcm_capture_avail(runtime);
	if (avail > runtime->avail_max)
		runtime->avail_max = avail;
	if (avail >= runtime->stop_threshold) {
		if (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING)
			snd_pcm_drain_done(substream);
		else
			xrun(substream);
		return -EPIPE;
	}
	if (avail >= runtime->control->avail_min)
		wake_up(&runtime->sleep);
	return 0;
}

T
Takashi Iwai 已提交
198 199 200 201
#define hw_ptr_error(substream, fmt, args...)				\
	do {								\
		if (xrun_debug(substream)) {				\
			if (printk_ratelimit()) {			\
202
				snd_printd("PCM: " fmt, ##args);	\
T
Takashi Iwai 已提交
203 204 205 206 207
			}						\
			dump_stack_on_xrun(substream);			\
		}							\
	} while (0)

208
static int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream *substream)
L
Linus Torvalds 已提交
209
{
T
Takashi Iwai 已提交
210
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
211
	snd_pcm_uframes_t pos;
212 213 214
	snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_ptr_interrupt, hw_base;
	snd_pcm_sframes_t hdelta, delta;
	unsigned long jdelta;
L
Linus Torvalds 已提交
215

216
	old_hw_ptr = runtime->status->hw_ptr;
L
Linus Torvalds 已提交
217 218 219 220 221
	pos = snd_pcm_update_hw_ptr_pos(substream, runtime);
	if (pos == SNDRV_PCM_POS_XRUN) {
		xrun(substream);
		return -EPIPE;
	}
T
Takashi Iwai 已提交
222 223
	hw_base = runtime->hw_ptr_base;
	new_hw_ptr = hw_base + pos;
L
Linus Torvalds 已提交
224
	hw_ptr_interrupt = runtime->hw_ptr_interrupt + runtime->period_size;
T
Takashi Iwai 已提交
225
	delta = new_hw_ptr - hw_ptr_interrupt;
226
	if (hw_ptr_interrupt >= runtime->boundary) {
T
Takashi Iwai 已提交
227 228 229
		hw_ptr_interrupt -= runtime->boundary;
		if (hw_base < runtime->boundary / 2)
			/* hw_base was already lapped; recalc delta */
230 231
			delta = new_hw_ptr - hw_ptr_interrupt;
	}
T
Takashi Iwai 已提交
232 233 234 235 236 237 238 239 240 241
	if (delta < 0) {
		delta += runtime->buffer_size;
		if (delta < 0) {
			hw_ptr_error(substream, 
				     "Unexpected hw_pointer value "
				     "(stream=%i, pos=%ld, intr_ptr=%ld)\n",
				     substream->stream, (long)pos,
				     (long)hw_ptr_interrupt);
			/* rebase to interrupt position */
			hw_base = new_hw_ptr = hw_ptr_interrupt;
242 243
			/* align hw_base to buffer_size */
			hw_base -= hw_base % runtime->buffer_size;
T
Takashi Iwai 已提交
244 245 246
			delta = 0;
		} else {
			hw_base += runtime->buffer_size;
T
Takashi Iwai 已提交
247
			if (hw_base >= runtime->boundary)
T
Takashi Iwai 已提交
248 249
				hw_base = 0;
			new_hw_ptr = hw_base + pos;
L
Linus Torvalds 已提交
250 251
		}
	}
252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275
	hdelta = new_hw_ptr - old_hw_ptr;
	jdelta = jiffies - runtime->hw_ptr_jiffies;
	if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
		delta = jdelta /
			(((runtime->period_size * HZ) / runtime->rate)
								+ HZ/100);
		hw_ptr_error(substream,
			     "hw_ptr skipping! [Q] "
			     "(pos=%ld, delta=%ld, period=%ld, "
			     "jdelta=%lu/%lu/%lu)\n",
			     (long)pos, (long)hdelta,
			     (long)runtime->period_size, jdelta,
			     ((hdelta * HZ) / runtime->rate), delta);
		hw_ptr_interrupt = runtime->hw_ptr_interrupt +
				   runtime->period_size * delta;
		if (hw_ptr_interrupt >= runtime->boundary)
			hw_ptr_interrupt -= runtime->boundary;
		/* rebase to interrupt position */
		hw_base = new_hw_ptr = hw_ptr_interrupt;
		/* align hw_base to buffer_size */
		hw_base -= hw_base % runtime->buffer_size;
		delta = 0;
	}
	if (delta > runtime->period_size + runtime->period_size / 2) {
T
Takashi Iwai 已提交
276 277 278 279 280 281 282 283 284
		hw_ptr_error(substream,
			     "Lost interrupts? "
			     "(stream=%i, delta=%ld, intr_ptr=%ld)\n",
			     substream->stream, (long)delta,
			     (long)hw_ptr_interrupt);
		/* rebase hw_ptr_interrupt */
		hw_ptr_interrupt =
			new_hw_ptr - new_hw_ptr % runtime->period_size;
	}
L
Linus Torvalds 已提交
285 286 287 288
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
	    runtime->silence_size > 0)
		snd_pcm_playback_silence(substream, new_hw_ptr);

T
Takashi Iwai 已提交
289
	runtime->hw_ptr_base = hw_base;
L
Linus Torvalds 已提交
290
	runtime->status->hw_ptr = new_hw_ptr;
291
	runtime->hw_ptr_jiffies = jiffies;
T
Takashi Iwai 已提交
292
	runtime->hw_ptr_interrupt = hw_ptr_interrupt;
L
Linus Torvalds 已提交
293 294 295 296 297

	return snd_pcm_update_hw_ptr_post(substream, runtime);
}

/* CAUTION: call it with irq disabled */
T
Takashi Iwai 已提交
298
int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
L
Linus Torvalds 已提交
299
{
T
Takashi Iwai 已提交
300
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
301
	snd_pcm_uframes_t pos;
T
Takashi Iwai 已提交
302
	snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
L
Linus Torvalds 已提交
303
	snd_pcm_sframes_t delta;
304
	unsigned long jdelta;
L
Linus Torvalds 已提交
305 306 307 308 309 310 311

	old_hw_ptr = runtime->status->hw_ptr;
	pos = snd_pcm_update_hw_ptr_pos(substream, runtime);
	if (pos == SNDRV_PCM_POS_XRUN) {
		xrun(substream);
		return -EPIPE;
	}
T
Takashi Iwai 已提交
312 313
	hw_base = runtime->hw_ptr_base;
	new_hw_ptr = hw_base + pos;
L
Linus Torvalds 已提交
314

T
Takashi Iwai 已提交
315
	delta = new_hw_ptr - old_hw_ptr;
316
	jdelta = jiffies - runtime->hw_ptr_jiffies;
T
Takashi Iwai 已提交
317 318 319 320 321
	if (delta < 0) {
		delta += runtime->buffer_size;
		if (delta < 0) {
			hw_ptr_error(substream, 
				     "Unexpected hw_pointer value [2] "
322
				     "(stream=%i, pos=%ld, old_ptr=%ld, jdelta=%li)\n",
T
Takashi Iwai 已提交
323
				     substream->stream, (long)pos,
324
				     (long)old_hw_ptr, jdelta);
L
Linus Torvalds 已提交
325 326
			return 0;
		}
T
Takashi Iwai 已提交
327
		hw_base += runtime->buffer_size;
T
Takashi Iwai 已提交
328
		if (hw_base >= runtime->boundary)
T
Takashi Iwai 已提交
329 330 331
			hw_base = 0;
		new_hw_ptr = hw_base + pos;
	}
332
	if (((delta * HZ) / runtime->rate) > jdelta + HZ/100) {
T
Takashi Iwai 已提交
333 334
		hw_ptr_error(substream,
			     "hw_ptr skipping! "
335
			     "(pos=%ld, delta=%ld, period=%ld, jdelta=%lu/%lu)\n",
T
Takashi Iwai 已提交
336
			     (long)pos, (long)delta,
337 338
			     (long)runtime->period_size, jdelta,
			     ((delta * HZ) / runtime->rate));
T
Takashi Iwai 已提交
339
		return 0;
L
Linus Torvalds 已提交
340 341 342 343 344
	}
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
	    runtime->silence_size > 0)
		snd_pcm_playback_silence(substream, new_hw_ptr);

T
Takashi Iwai 已提交
345
	runtime->hw_ptr_base = hw_base;
L
Linus Torvalds 已提交
346
	runtime->status->hw_ptr = new_hw_ptr;
347
	runtime->hw_ptr_jiffies = jiffies;
L
Linus Torvalds 已提交
348 349 350 351 352 353 354 355 356 357 358 359

	return snd_pcm_update_hw_ptr_post(substream, runtime);
}

/**
 * snd_pcm_set_ops - set the PCM operators
 * @pcm: the pcm instance
 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
 * @ops: the operator table
 *
 * Sets the given PCM operators to the pcm instance.
 */
T
Takashi Iwai 已提交
360
void snd_pcm_set_ops(struct snd_pcm *pcm, int direction, struct snd_pcm_ops *ops)
L
Linus Torvalds 已提交
361
{
T
Takashi Iwai 已提交
362 363
	struct snd_pcm_str *stream = &pcm->streams[direction];
	struct snd_pcm_substream *substream;
L
Linus Torvalds 已提交
364 365 366 367 368
	
	for (substream = stream->substream; substream != NULL; substream = substream->next)
		substream->ops = ops;
}

369
EXPORT_SYMBOL(snd_pcm_set_ops);
L
Linus Torvalds 已提交
370 371 372 373 374 375 376

/**
 * snd_pcm_sync - set the PCM sync id
 * @substream: the pcm substream
 *
 * Sets the PCM sync identifier for the card.
 */
T
Takashi Iwai 已提交
377
void snd_pcm_set_sync(struct snd_pcm_substream *substream)
L
Linus Torvalds 已提交
378
{
T
Takashi Iwai 已提交
379
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
380 381 382 383 384 385 386
	
	runtime->sync.id32[0] = substream->pcm->card->number;
	runtime->sync.id32[1] = -1;
	runtime->sync.id32[2] = -1;
	runtime->sync.id32[3] = -1;
}

387 388
EXPORT_SYMBOL(snd_pcm_set_sync);

L
Linus Torvalds 已提交
389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436
/*
 *  Standard ioctl routine
 */

static inline unsigned int div32(unsigned int a, unsigned int b, 
				 unsigned int *r)
{
	if (b == 0) {
		*r = 0;
		return UINT_MAX;
	}
	*r = a % b;
	return a / b;
}

static inline unsigned int div_down(unsigned int a, unsigned int b)
{
	if (b == 0)
		return UINT_MAX;
	return a / b;
}

static inline unsigned int div_up(unsigned int a, unsigned int b)
{
	unsigned int r;
	unsigned int q;
	if (b == 0)
		return UINT_MAX;
	q = div32(a, b, &r);
	if (r)
		++q;
	return q;
}

static inline unsigned int mul(unsigned int a, unsigned int b)
{
	if (a == 0)
		return 0;
	if (div_down(UINT_MAX, a) < b)
		return UINT_MAX;
	return a * b;
}

static inline unsigned int muldiv32(unsigned int a, unsigned int b,
				    unsigned int c, unsigned int *r)
{
	u_int64_t n = (u_int64_t) a * b;
	if (c == 0) {
437
		snd_BUG_ON(!n);
L
Linus Torvalds 已提交
438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459
		*r = 0;
		return UINT_MAX;
	}
	div64_32(&n, c, r);
	if (n >= UINT_MAX) {
		*r = 0;
		return UINT_MAX;
	}
	return n;
}

/**
 * snd_interval_refine - refine the interval value of configurator
 * @i: the interval value to refine
 * @v: the interval value to refer to
 *
 * Refines the interval value with the reference value.
 * The interval is changed to the range satisfying both intervals.
 * The interval status (min, max, integer, etc.) are evaluated.
 *
 * Returns non-zero if the value is changed, zero if not changed.
 */
T
Takashi Iwai 已提交
460
int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
L
Linus Torvalds 已提交
461 462
{
	int changed = 0;
463 464
	if (snd_BUG_ON(snd_interval_empty(i)))
		return -EINVAL;
L
Linus Torvalds 已提交
465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502
	if (i->min < v->min) {
		i->min = v->min;
		i->openmin = v->openmin;
		changed = 1;
	} else if (i->min == v->min && !i->openmin && v->openmin) {
		i->openmin = 1;
		changed = 1;
	}
	if (i->max > v->max) {
		i->max = v->max;
		i->openmax = v->openmax;
		changed = 1;
	} else if (i->max == v->max && !i->openmax && v->openmax) {
		i->openmax = 1;
		changed = 1;
	}
	if (!i->integer && v->integer) {
		i->integer = 1;
		changed = 1;
	}
	if (i->integer) {
		if (i->openmin) {
			i->min++;
			i->openmin = 0;
		}
		if (i->openmax) {
			i->max--;
			i->openmax = 0;
		}
	} else if (!i->openmin && !i->openmax && i->min == i->max)
		i->integer = 1;
	if (snd_interval_checkempty(i)) {
		snd_interval_none(i);
		return -EINVAL;
	}
	return changed;
}

503 504
EXPORT_SYMBOL(snd_interval_refine);

T
Takashi Iwai 已提交
505
static int snd_interval_refine_first(struct snd_interval *i)
L
Linus Torvalds 已提交
506
{
507 508
	if (snd_BUG_ON(snd_interval_empty(i)))
		return -EINVAL;
L
Linus Torvalds 已提交
509 510 511 512 513 514 515 516 517
	if (snd_interval_single(i))
		return 0;
	i->max = i->min;
	i->openmax = i->openmin;
	if (i->openmax)
		i->max++;
	return 1;
}

T
Takashi Iwai 已提交
518
static int snd_interval_refine_last(struct snd_interval *i)
L
Linus Torvalds 已提交
519
{
520 521
	if (snd_BUG_ON(snd_interval_empty(i)))
		return -EINVAL;
L
Linus Torvalds 已提交
522 523 524 525 526 527 528 529 530
	if (snd_interval_single(i))
		return 0;
	i->min = i->max;
	i->openmin = i->openmax;
	if (i->openmin)
		i->min--;
	return 1;
}

T
Takashi Iwai 已提交
531
void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
L
Linus Torvalds 已提交
532 533 534 535 536 537 538 539 540 541 542 543 544 545 546
{
	if (a->empty || b->empty) {
		snd_interval_none(c);
		return;
	}
	c->empty = 0;
	c->min = mul(a->min, b->min);
	c->openmin = (a->openmin || b->openmin);
	c->max = mul(a->max,  b->max);
	c->openmax = (a->openmax || b->openmax);
	c->integer = (a->integer && b->integer);
}

/**
 * snd_interval_div - refine the interval value with division
T
Takashi Iwai 已提交
547 548 549
 * @a: dividend
 * @b: divisor
 * @c: quotient
L
Linus Torvalds 已提交
550 551 552 553 554
 *
 * c = a / b
 *
 * Returns non-zero if the value is changed, zero if not changed.
 */
T
Takashi Iwai 已提交
555
void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
L
Linus Torvalds 已提交
556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580
{
	unsigned int r;
	if (a->empty || b->empty) {
		snd_interval_none(c);
		return;
	}
	c->empty = 0;
	c->min = div32(a->min, b->max, &r);
	c->openmin = (r || a->openmin || b->openmax);
	if (b->min > 0) {
		c->max = div32(a->max, b->min, &r);
		if (r) {
			c->max++;
			c->openmax = 1;
		} else
			c->openmax = (a->openmax || b->openmin);
	} else {
		c->max = UINT_MAX;
		c->openmax = 0;
	}
	c->integer = 0;
}

/**
 * snd_interval_muldivk - refine the interval value
T
Takashi Iwai 已提交
581 582 583 584 585
 * @a: dividend 1
 * @b: dividend 2
 * @k: divisor (as integer)
 * @c: result
  *
L
Linus Torvalds 已提交
586 587 588 589
 * c = a * b / k
 *
 * Returns non-zero if the value is changed, zero if not changed.
 */
T
Takashi Iwai 已提交
590 591
void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
		      unsigned int k, struct snd_interval *c)
L
Linus Torvalds 已提交
592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611
{
	unsigned int r;
	if (a->empty || b->empty) {
		snd_interval_none(c);
		return;
	}
	c->empty = 0;
	c->min = muldiv32(a->min, b->min, k, &r);
	c->openmin = (r || a->openmin || b->openmin);
	c->max = muldiv32(a->max, b->max, k, &r);
	if (r) {
		c->max++;
		c->openmax = 1;
	} else
		c->openmax = (a->openmax || b->openmax);
	c->integer = 0;
}

/**
 * snd_interval_mulkdiv - refine the interval value
T
Takashi Iwai 已提交
612 613 614 615
 * @a: dividend 1
 * @k: dividend 2 (as integer)
 * @b: divisor
 * @c: result
L
Linus Torvalds 已提交
616 617 618 619 620
 *
 * c = a * k / b
 *
 * Returns non-zero if the value is changed, zero if not changed.
 */
T
Takashi Iwai 已提交
621 622
void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
		      const struct snd_interval *b, struct snd_interval *c)
L
Linus Torvalds 已提交
623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650
{
	unsigned int r;
	if (a->empty || b->empty) {
		snd_interval_none(c);
		return;
	}
	c->empty = 0;
	c->min = muldiv32(a->min, k, b->max, &r);
	c->openmin = (r || a->openmin || b->openmax);
	if (b->min > 0) {
		c->max = muldiv32(a->max, k, b->min, &r);
		if (r) {
			c->max++;
			c->openmax = 1;
		} else
			c->openmax = (a->openmax || b->openmin);
	} else {
		c->max = UINT_MAX;
		c->openmax = 0;
	}
	c->integer = 0;
}

/* ---- */


/**
 * snd_interval_ratnum - refine the interval value
T
Takashi Iwai 已提交
651 652 653 654 655
 * @i: interval to refine
 * @rats_count: number of ratnum_t 
 * @rats: ratnum_t array
 * @nump: pointer to store the resultant numerator
 * @denp: pointer to store the resultant denominator
L
Linus Torvalds 已提交
656 657 658
 *
 * Returns non-zero if the value is changed, zero if not changed.
 */
T
Takashi Iwai 已提交
659 660 661
int snd_interval_ratnum(struct snd_interval *i,
			unsigned int rats_count, struct snd_ratnum *rats,
			unsigned int *nump, unsigned int *denp)
L
Linus Torvalds 已提交
662 663 664
{
	unsigned int best_num, best_diff, best_den;
	unsigned int k;
T
Takashi Iwai 已提交
665
	struct snd_interval t;
L
Linus Torvalds 已提交
666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750
	int err;

	best_num = best_den = best_diff = 0;
	for (k = 0; k < rats_count; ++k) {
		unsigned int num = rats[k].num;
		unsigned int den;
		unsigned int q = i->min;
		int diff;
		if (q == 0)
			q = 1;
		den = div_down(num, q);
		if (den < rats[k].den_min)
			continue;
		if (den > rats[k].den_max)
			den = rats[k].den_max;
		else {
			unsigned int r;
			r = (den - rats[k].den_min) % rats[k].den_step;
			if (r != 0)
				den -= r;
		}
		diff = num - q * den;
		if (best_num == 0 ||
		    diff * best_den < best_diff * den) {
			best_diff = diff;
			best_den = den;
			best_num = num;
		}
	}
	if (best_den == 0) {
		i->empty = 1;
		return -EINVAL;
	}
	t.min = div_down(best_num, best_den);
	t.openmin = !!(best_num % best_den);
	
	best_num = best_den = best_diff = 0;
	for (k = 0; k < rats_count; ++k) {
		unsigned int num = rats[k].num;
		unsigned int den;
		unsigned int q = i->max;
		int diff;
		if (q == 0) {
			i->empty = 1;
			return -EINVAL;
		}
		den = div_up(num, q);
		if (den > rats[k].den_max)
			continue;
		if (den < rats[k].den_min)
			den = rats[k].den_min;
		else {
			unsigned int r;
			r = (den - rats[k].den_min) % rats[k].den_step;
			if (r != 0)
				den += rats[k].den_step - r;
		}
		diff = q * den - num;
		if (best_num == 0 ||
		    diff * best_den < best_diff * den) {
			best_diff = diff;
			best_den = den;
			best_num = num;
		}
	}
	if (best_den == 0) {
		i->empty = 1;
		return -EINVAL;
	}
	t.max = div_up(best_num, best_den);
	t.openmax = !!(best_num % best_den);
	t.integer = 0;
	err = snd_interval_refine(i, &t);
	if (err < 0)
		return err;

	if (snd_interval_single(i)) {
		if (nump)
			*nump = best_num;
		if (denp)
			*denp = best_den;
	}
	return err;
}

751 752
EXPORT_SYMBOL(snd_interval_ratnum);

L
Linus Torvalds 已提交
753 754
/**
 * snd_interval_ratden - refine the interval value
T
Takashi Iwai 已提交
755
 * @i: interval to refine
T
Takashi Iwai 已提交
756 757
 * @rats_count: number of struct ratden
 * @rats: struct ratden array
T
Takashi Iwai 已提交
758 759
 * @nump: pointer to store the resultant numerator
 * @denp: pointer to store the resultant denominator
L
Linus Torvalds 已提交
760 761 762
 *
 * Returns non-zero if the value is changed, zero if not changed.
 */
T
Takashi Iwai 已提交
763 764
static int snd_interval_ratden(struct snd_interval *i,
			       unsigned int rats_count, struct snd_ratden *rats,
L
Linus Torvalds 已提交
765 766 767 768
			       unsigned int *nump, unsigned int *denp)
{
	unsigned int best_num, best_diff, best_den;
	unsigned int k;
T
Takashi Iwai 已提交
769
	struct snd_interval t;
L
Linus Torvalds 已提交
770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861
	int err;

	best_num = best_den = best_diff = 0;
	for (k = 0; k < rats_count; ++k) {
		unsigned int num;
		unsigned int den = rats[k].den;
		unsigned int q = i->min;
		int diff;
		num = mul(q, den);
		if (num > rats[k].num_max)
			continue;
		if (num < rats[k].num_min)
			num = rats[k].num_max;
		else {
			unsigned int r;
			r = (num - rats[k].num_min) % rats[k].num_step;
			if (r != 0)
				num += rats[k].num_step - r;
		}
		diff = num - q * den;
		if (best_num == 0 ||
		    diff * best_den < best_diff * den) {
			best_diff = diff;
			best_den = den;
			best_num = num;
		}
	}
	if (best_den == 0) {
		i->empty = 1;
		return -EINVAL;
	}
	t.min = div_down(best_num, best_den);
	t.openmin = !!(best_num % best_den);
	
	best_num = best_den = best_diff = 0;
	for (k = 0; k < rats_count; ++k) {
		unsigned int num;
		unsigned int den = rats[k].den;
		unsigned int q = i->max;
		int diff;
		num = mul(q, den);
		if (num < rats[k].num_min)
			continue;
		if (num > rats[k].num_max)
			num = rats[k].num_max;
		else {
			unsigned int r;
			r = (num - rats[k].num_min) % rats[k].num_step;
			if (r != 0)
				num -= r;
		}
		diff = q * den - num;
		if (best_num == 0 ||
		    diff * best_den < best_diff * den) {
			best_diff = diff;
			best_den = den;
			best_num = num;
		}
	}
	if (best_den == 0) {
		i->empty = 1;
		return -EINVAL;
	}
	t.max = div_up(best_num, best_den);
	t.openmax = !!(best_num % best_den);
	t.integer = 0;
	err = snd_interval_refine(i, &t);
	if (err < 0)
		return err;

	if (snd_interval_single(i)) {
		if (nump)
			*nump = best_num;
		if (denp)
			*denp = best_den;
	}
	return err;
}

/**
 * snd_interval_list - refine the interval value from the list
 * @i: the interval value to refine
 * @count: the number of elements in the list
 * @list: the value list
 * @mask: the bit-mask to evaluate
 *
 * Refines the interval value from the list.
 * When mask is non-zero, only the elements corresponding to bit 1 are
 * evaluated.
 *
 * Returns non-zero if the value is changed, zero if not changed.
 */
T
Takashi Iwai 已提交
862
int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask)
L
Linus Torvalds 已提交
863 864 865
{
        unsigned int k;
	int changed = 0;
866 867 868 869 870

	if (!count) {
		i->empty = 1;
		return -EINVAL;
	}
L
Linus Torvalds 已提交
871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907
        for (k = 0; k < count; k++) {
		if (mask && !(mask & (1 << k)))
			continue;
                if (i->min == list[k] && !i->openmin)
                        goto _l1;
                if (i->min < list[k]) {
                        i->min = list[k];
			i->openmin = 0;
			changed = 1;
                        goto _l1;
                }
        }
        i->empty = 1;
        return -EINVAL;
 _l1:
        for (k = count; k-- > 0;) {
		if (mask && !(mask & (1 << k)))
			continue;
                if (i->max == list[k] && !i->openmax)
                        goto _l2;
                if (i->max > list[k]) {
                        i->max = list[k];
			i->openmax = 0;
			changed = 1;
                        goto _l2;
                }
        }
        i->empty = 1;
        return -EINVAL;
 _l2:
	if (snd_interval_checkempty(i)) {
		i->empty = 1;
		return -EINVAL;
	}
        return changed;
}

908 909
EXPORT_SYMBOL(snd_interval_list);

T
Takashi Iwai 已提交
910
static int snd_interval_step(struct snd_interval *i, unsigned int min, unsigned int step)
L
Linus Torvalds 已提交
911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943
{
	unsigned int n;
	int changed = 0;
	n = (i->min - min) % step;
	if (n != 0 || i->openmin) {
		i->min += step - n;
		changed = 1;
	}
	n = (i->max - min) % step;
	if (n != 0 || i->openmax) {
		i->max -= n;
		changed = 1;
	}
	if (snd_interval_checkempty(i)) {
		i->empty = 1;
		return -EINVAL;
	}
	return changed;
}

/* Info constraints helpers */

/**
 * snd_pcm_hw_rule_add - add the hw-constraint rule
 * @runtime: the pcm runtime instance
 * @cond: condition bits
 * @var: the variable to evaluate
 * @func: the evaluation function
 * @private: the private data pointer passed to function
 * @dep: the dependent variables
 *
 * Returns zero if successful, or a negative error code on failure.
 */
T
Takashi Iwai 已提交
944
int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
L
Linus Torvalds 已提交
945 946 947 948
			int var,
			snd_pcm_hw_rule_func_t func, void *private,
			int dep, ...)
{
T
Takashi Iwai 已提交
949 950
	struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
	struct snd_pcm_hw_rule *c;
L
Linus Torvalds 已提交
951 952 953 954
	unsigned int k;
	va_list args;
	va_start(args, dep);
	if (constrs->rules_num >= constrs->rules_all) {
T
Takashi Iwai 已提交
955
		struct snd_pcm_hw_rule *new;
L
Linus Torvalds 已提交
956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974
		unsigned int new_rules = constrs->rules_all + 16;
		new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
		if (!new)
			return -ENOMEM;
		if (constrs->rules) {
			memcpy(new, constrs->rules,
			       constrs->rules_num * sizeof(*c));
			kfree(constrs->rules);
		}
		constrs->rules = new;
		constrs->rules_all = new_rules;
	}
	c = &constrs->rules[constrs->rules_num];
	c->cond = cond;
	c->func = func;
	c->var = var;
	c->private = private;
	k = 0;
	while (1) {
975 976
		if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps)))
			return -EINVAL;
L
Linus Torvalds 已提交
977 978 979 980 981 982 983 984 985 986
		c->deps[k++] = dep;
		if (dep < 0)
			break;
		dep = va_arg(args, int);
	}
	constrs->rules_num++;
	va_end(args);
	return 0;
}				    

987 988
EXPORT_SYMBOL(snd_pcm_hw_rule_add);

L
Linus Torvalds 已提交
989
/**
990
 * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
T
Takashi Iwai 已提交
991 992 993 994
 * @runtime: PCM runtime instance
 * @var: hw_params variable to apply the mask
 * @mask: the bitmap mask
 *
995
 * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
L
Linus Torvalds 已提交
996
 */
T
Takashi Iwai 已提交
997
int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
L
Linus Torvalds 已提交
998 999
			       u_int32_t mask)
{
T
Takashi Iwai 已提交
1000 1001
	struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
	struct snd_mask *maskp = constrs_mask(constrs, var);
L
Linus Torvalds 已提交
1002 1003 1004 1005 1006 1007 1008 1009
	*maskp->bits &= mask;
	memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
	if (*maskp->bits == 0)
		return -EINVAL;
	return 0;
}

/**
1010
 * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
T
Takashi Iwai 已提交
1011 1012 1013 1014
 * @runtime: PCM runtime instance
 * @var: hw_params variable to apply the mask
 * @mask: the 64bit bitmap mask
 *
1015
 * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
L
Linus Torvalds 已提交
1016
 */
T
Takashi Iwai 已提交
1017
int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
L
Linus Torvalds 已提交
1018 1019
				 u_int64_t mask)
{
T
Takashi Iwai 已提交
1020 1021
	struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
	struct snd_mask *maskp = constrs_mask(constrs, var);
L
Linus Torvalds 已提交
1022 1023 1024 1025 1026 1027 1028 1029 1030
	maskp->bits[0] &= (u_int32_t)mask;
	maskp->bits[1] &= (u_int32_t)(mask >> 32);
	memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
	if (! maskp->bits[0] && ! maskp->bits[1])
		return -EINVAL;
	return 0;
}

/**
1031
 * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
T
Takashi Iwai 已提交
1032 1033 1034 1035
 * @runtime: PCM runtime instance
 * @var: hw_params variable to apply the integer constraint
 *
 * Apply the constraint of integer to an interval parameter.
L
Linus Torvalds 已提交
1036
 */
T
Takashi Iwai 已提交
1037
int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
L
Linus Torvalds 已提交
1038
{
T
Takashi Iwai 已提交
1039
	struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
L
Linus Torvalds 已提交
1040 1041 1042
	return snd_interval_setinteger(constrs_interval(constrs, var));
}

1043 1044
EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);

L
Linus Torvalds 已提交
1045
/**
1046
 * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
T
Takashi Iwai 已提交
1047 1048 1049 1050 1051 1052
 * @runtime: PCM runtime instance
 * @var: hw_params variable to apply the range
 * @min: the minimal value
 * @max: the maximal value
 * 
 * Apply the min/max range constraint to an interval parameter.
L
Linus Torvalds 已提交
1053
 */
T
Takashi Iwai 已提交
1054
int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
L
Linus Torvalds 已提交
1055 1056
				 unsigned int min, unsigned int max)
{
T
Takashi Iwai 已提交
1057 1058
	struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
	struct snd_interval t;
L
Linus Torvalds 已提交
1059 1060 1061 1062 1063 1064 1065
	t.min = min;
	t.max = max;
	t.openmin = t.openmax = 0;
	t.integer = 0;
	return snd_interval_refine(constrs_interval(constrs, var), &t);
}

1066 1067
EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);

T
Takashi Iwai 已提交
1068 1069
static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
				struct snd_pcm_hw_rule *rule)
L
Linus Torvalds 已提交
1070
{
T
Takashi Iwai 已提交
1071
	struct snd_pcm_hw_constraint_list *list = rule->private;
L
Linus Torvalds 已提交
1072 1073 1074 1075 1076
	return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
}		


/**
1077
 * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
T
Takashi Iwai 已提交
1078 1079 1080 1081 1082 1083
 * @runtime: PCM runtime instance
 * @cond: condition bits
 * @var: hw_params variable to apply the list constraint
 * @l: list
 * 
 * Apply the list of constraints to an interval parameter.
L
Linus Torvalds 已提交
1084
 */
T
Takashi Iwai 已提交
1085
int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
L
Linus Torvalds 已提交
1086 1087
			       unsigned int cond,
			       snd_pcm_hw_param_t var,
T
Takashi Iwai 已提交
1088
			       struct snd_pcm_hw_constraint_list *l)
L
Linus Torvalds 已提交
1089 1090 1091 1092 1093 1094
{
	return snd_pcm_hw_rule_add(runtime, cond, var,
				   snd_pcm_hw_rule_list, l,
				   var, -1);
}

1095 1096
EXPORT_SYMBOL(snd_pcm_hw_constraint_list);

T
Takashi Iwai 已提交
1097 1098
static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
				   struct snd_pcm_hw_rule *rule)
L
Linus Torvalds 已提交
1099
{
T
Takashi Iwai 已提交
1100
	struct snd_pcm_hw_constraint_ratnums *r = rule->private;
L
Linus Torvalds 已提交
1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112
	unsigned int num = 0, den = 0;
	int err;
	err = snd_interval_ratnum(hw_param_interval(params, rule->var),
				  r->nrats, r->rats, &num, &den);
	if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
		params->rate_num = num;
		params->rate_den = den;
	}
	return err;
}

/**
1113
 * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
T
Takashi Iwai 已提交
1114 1115 1116
 * @runtime: PCM runtime instance
 * @cond: condition bits
 * @var: hw_params variable to apply the ratnums constraint
T
Takashi Iwai 已提交
1117
 * @r: struct snd_ratnums constriants
L
Linus Torvalds 已提交
1118
 */
T
Takashi Iwai 已提交
1119
int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime, 
L
Linus Torvalds 已提交
1120 1121
				  unsigned int cond,
				  snd_pcm_hw_param_t var,
T
Takashi Iwai 已提交
1122
				  struct snd_pcm_hw_constraint_ratnums *r)
L
Linus Torvalds 已提交
1123 1124 1125 1126 1127 1128
{
	return snd_pcm_hw_rule_add(runtime, cond, var,
				   snd_pcm_hw_rule_ratnums, r,
				   var, -1);
}

1129 1130
EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);

T
Takashi Iwai 已提交
1131 1132
static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
				   struct snd_pcm_hw_rule *rule)
L
Linus Torvalds 已提交
1133
{
T
Takashi Iwai 已提交
1134
	struct snd_pcm_hw_constraint_ratdens *r = rule->private;
L
Linus Torvalds 已提交
1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145
	unsigned int num = 0, den = 0;
	int err = snd_interval_ratden(hw_param_interval(params, rule->var),
				  r->nrats, r->rats, &num, &den);
	if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
		params->rate_num = num;
		params->rate_den = den;
	}
	return err;
}

/**
1146
 * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
T
Takashi Iwai 已提交
1147 1148 1149
 * @runtime: PCM runtime instance
 * @cond: condition bits
 * @var: hw_params variable to apply the ratdens constraint
T
Takashi Iwai 已提交
1150
 * @r: struct snd_ratdens constriants
L
Linus Torvalds 已提交
1151
 */
T
Takashi Iwai 已提交
1152
int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime, 
L
Linus Torvalds 已提交
1153 1154
				  unsigned int cond,
				  snd_pcm_hw_param_t var,
T
Takashi Iwai 已提交
1155
				  struct snd_pcm_hw_constraint_ratdens *r)
L
Linus Torvalds 已提交
1156 1157 1158 1159 1160 1161
{
	return snd_pcm_hw_rule_add(runtime, cond, var,
				   snd_pcm_hw_rule_ratdens, r,
				   var, -1);
}

1162 1163
EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);

T
Takashi Iwai 已提交
1164 1165
static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
				  struct snd_pcm_hw_rule *rule)
L
Linus Torvalds 已提交
1166 1167 1168 1169
{
	unsigned int l = (unsigned long) rule->private;
	int width = l & 0xffff;
	unsigned int msbits = l >> 16;
T
Takashi Iwai 已提交
1170
	struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
L
Linus Torvalds 已提交
1171 1172 1173 1174 1175 1176
	if (snd_interval_single(i) && snd_interval_value(i) == width)
		params->msbits = msbits;
	return 0;
}

/**
1177
 * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
T
Takashi Iwai 已提交
1178 1179 1180 1181
 * @runtime: PCM runtime instance
 * @cond: condition bits
 * @width: sample bits width
 * @msbits: msbits width
L
Linus Torvalds 已提交
1182
 */
T
Takashi Iwai 已提交
1183
int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime, 
L
Linus Torvalds 已提交
1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194
				 unsigned int cond,
				 unsigned int width,
				 unsigned int msbits)
{
	unsigned long l = (msbits << 16) | width;
	return snd_pcm_hw_rule_add(runtime, cond, -1,
				    snd_pcm_hw_rule_msbits,
				    (void*) l,
				    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
}

1195 1196
EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);

T
Takashi Iwai 已提交
1197 1198
static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
				struct snd_pcm_hw_rule *rule)
L
Linus Torvalds 已提交
1199 1200 1201 1202 1203 1204
{
	unsigned long step = (unsigned long) rule->private;
	return snd_interval_step(hw_param_interval(params, rule->var), 0, step);
}

/**
1205
 * snd_pcm_hw_constraint_step - add a hw constraint step rule
T
Takashi Iwai 已提交
1206 1207 1208 1209
 * @runtime: PCM runtime instance
 * @cond: condition bits
 * @var: hw_params variable to apply the step constraint
 * @step: step size
L
Linus Torvalds 已提交
1210
 */
T
Takashi Iwai 已提交
1211
int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
L
Linus Torvalds 已提交
1212 1213 1214 1215 1216 1217 1218 1219 1220
			       unsigned int cond,
			       snd_pcm_hw_param_t var,
			       unsigned long step)
{
	return snd_pcm_hw_rule_add(runtime, cond, var, 
				   snd_pcm_hw_rule_step, (void *) step,
				   var, -1);
}

1221 1222
EXPORT_SYMBOL(snd_pcm_hw_constraint_step);

T
Takashi Iwai 已提交
1223
static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
L
Linus Torvalds 已提交
1224
{
1225
	static unsigned int pow2_sizes[] = {
L
Linus Torvalds 已提交
1226 1227 1228 1229 1230 1231 1232 1233 1234 1235
		1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
		1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
		1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
		1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
	};
	return snd_interval_list(hw_param_interval(params, rule->var),
				 ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
}		

/**
1236
 * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
T
Takashi Iwai 已提交
1237 1238 1239
 * @runtime: PCM runtime instance
 * @cond: condition bits
 * @var: hw_params variable to apply the power-of-2 constraint
L
Linus Torvalds 已提交
1240
 */
T
Takashi Iwai 已提交
1241
int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
L
Linus Torvalds 已提交
1242 1243 1244 1245 1246 1247 1248 1249
			       unsigned int cond,
			       snd_pcm_hw_param_t var)
{
	return snd_pcm_hw_rule_add(runtime, cond, var, 
				   snd_pcm_hw_rule_pow2, NULL,
				   var, -1);
}

1250 1251
EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);

T
Takashi Iwai 已提交
1252
static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
1253
				  snd_pcm_hw_param_t var)
L
Linus Torvalds 已提交
1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269
{
	if (hw_is_mask(var)) {
		snd_mask_any(hw_param_mask(params, var));
		params->cmask |= 1 << var;
		params->rmask |= 1 << var;
		return;
	}
	if (hw_is_interval(var)) {
		snd_interval_any(hw_param_interval(params, var));
		params->cmask |= 1 << var;
		params->rmask |= 1 << var;
		return;
	}
	snd_BUG();
}

T
Takashi Iwai 已提交
1270
void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
L
Linus Torvalds 已提交
1271 1272 1273 1274 1275 1276 1277 1278 1279 1280
{
	unsigned int k;
	memset(params, 0, sizeof(*params));
	for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
		_snd_pcm_hw_param_any(params, k);
	for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
		_snd_pcm_hw_param_any(params, k);
	params->info = ~0U;
}

1281
EXPORT_SYMBOL(_snd_pcm_hw_params_any);
L
Linus Torvalds 已提交
1282 1283

/**
1284
 * snd_pcm_hw_param_value - return @params field @var value
T
Takashi Iwai 已提交
1285 1286
 * @params: the hw_params instance
 * @var: parameter to retrieve
1287
 * @dir: pointer to the direction (-1,0,1) or %NULL
L
Linus Torvalds 已提交
1288
 *
1289 1290
 * Return the value for field @var if it's fixed in configuration space
 * defined by @params. Return -%EINVAL otherwise.
L
Linus Torvalds 已提交
1291
 */
1292 1293
int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
			   snd_pcm_hw_param_t var, int *dir)
L
Linus Torvalds 已提交
1294 1295
{
	if (hw_is_mask(var)) {
T
Takashi Iwai 已提交
1296
		const struct snd_mask *mask = hw_param_mask_c(params, var);
L
Linus Torvalds 已提交
1297 1298 1299 1300 1301 1302 1303
		if (!snd_mask_single(mask))
			return -EINVAL;
		if (dir)
			*dir = 0;
		return snd_mask_value(mask);
	}
	if (hw_is_interval(var)) {
T
Takashi Iwai 已提交
1304
		const struct snd_interval *i = hw_param_interval_c(params, var);
L
Linus Torvalds 已提交
1305 1306 1307 1308 1309 1310 1311 1312 1313
		if (!snd_interval_single(i))
			return -EINVAL;
		if (dir)
			*dir = i->openmin;
		return snd_interval_value(i);
	}
	return -EINVAL;
}

1314
EXPORT_SYMBOL(snd_pcm_hw_param_value);
L
Linus Torvalds 已提交
1315

T
Takashi Iwai 已提交
1316
void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
L
Linus Torvalds 已提交
1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331
				snd_pcm_hw_param_t var)
{
	if (hw_is_mask(var)) {
		snd_mask_none(hw_param_mask(params, var));
		params->cmask |= 1 << var;
		params->rmask |= 1 << var;
	} else if (hw_is_interval(var)) {
		snd_interval_none(hw_param_interval(params, var));
		params->cmask |= 1 << var;
		params->rmask |= 1 << var;
	} else {
		snd_BUG();
	}
}

1332
EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
L
Linus Torvalds 已提交
1333

T
Takashi Iwai 已提交
1334
static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
1335
				   snd_pcm_hw_param_t var)
L
Linus Torvalds 已提交
1336 1337 1338 1339 1340 1341
{
	int changed;
	if (hw_is_mask(var))
		changed = snd_mask_refine_first(hw_param_mask(params, var));
	else if (hw_is_interval(var))
		changed = snd_interval_refine_first(hw_param_interval(params, var));
1342
	else
L
Linus Torvalds 已提交
1343 1344 1345 1346 1347 1348 1349 1350 1351 1352
		return -EINVAL;
	if (changed) {
		params->cmask |= 1 << var;
		params->rmask |= 1 << var;
	}
	return changed;
}


/**
1353
 * snd_pcm_hw_param_first - refine config space and return minimum value
T
Takashi Iwai 已提交
1354 1355 1356
 * @pcm: PCM instance
 * @params: the hw_params instance
 * @var: parameter to retrieve
1357
 * @dir: pointer to the direction (-1,0,1) or %NULL
L
Linus Torvalds 已提交
1358
 *
1359
 * Inside configuration space defined by @params remove from @var all
L
Linus Torvalds 已提交
1360 1361 1362
 * values > minimum. Reduce configuration space accordingly.
 * Return the minimum.
 */
1363 1364 1365
int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm, 
			   struct snd_pcm_hw_params *params, 
			   snd_pcm_hw_param_t var, int *dir)
L
Linus Torvalds 已提交
1366 1367 1368 1369 1370 1371
{
	int changed = _snd_pcm_hw_param_first(params, var);
	if (changed < 0)
		return changed;
	if (params->rmask) {
		int err = snd_pcm_hw_refine(pcm, params);
1372 1373
		if (snd_BUG_ON(err < 0))
			return err;
L
Linus Torvalds 已提交
1374 1375 1376 1377
	}
	return snd_pcm_hw_param_value(params, var, dir);
}

1378 1379
EXPORT_SYMBOL(snd_pcm_hw_param_first);

T
Takashi Iwai 已提交
1380
static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
1381
				  snd_pcm_hw_param_t var)
L
Linus Torvalds 已提交
1382 1383 1384 1385 1386 1387
{
	int changed;
	if (hw_is_mask(var))
		changed = snd_mask_refine_last(hw_param_mask(params, var));
	else if (hw_is_interval(var))
		changed = snd_interval_refine_last(hw_param_interval(params, var));
1388
	else
L
Linus Torvalds 已提交
1389 1390 1391 1392 1393 1394 1395 1396 1397 1398
		return -EINVAL;
	if (changed) {
		params->cmask |= 1 << var;
		params->rmask |= 1 << var;
	}
	return changed;
}


/**
1399
 * snd_pcm_hw_param_last - refine config space and return maximum value
T
Takashi Iwai 已提交
1400 1401 1402
 * @pcm: PCM instance
 * @params: the hw_params instance
 * @var: parameter to retrieve
1403
 * @dir: pointer to the direction (-1,0,1) or %NULL
L
Linus Torvalds 已提交
1404
 *
1405
 * Inside configuration space defined by @params remove from @var all
L
Linus Torvalds 已提交
1406 1407 1408
 * values < maximum. Reduce configuration space accordingly.
 * Return the maximum.
 */
1409 1410 1411
int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm, 
			  struct snd_pcm_hw_params *params,
			  snd_pcm_hw_param_t var, int *dir)
L
Linus Torvalds 已提交
1412 1413 1414 1415 1416 1417
{
	int changed = _snd_pcm_hw_param_last(params, var);
	if (changed < 0)
		return changed;
	if (params->rmask) {
		int err = snd_pcm_hw_refine(pcm, params);
1418 1419
		if (snd_BUG_ON(err < 0))
			return err;
L
Linus Torvalds 已提交
1420 1421 1422 1423
	}
	return snd_pcm_hw_param_value(params, var, dir);
}

1424
EXPORT_SYMBOL(snd_pcm_hw_param_last);
L
Linus Torvalds 已提交
1425 1426

/**
1427
 * snd_pcm_hw_param_choose - choose a configuration defined by @params
T
Takashi Iwai 已提交
1428 1429
 * @pcm: PCM instance
 * @params: the hw_params instance
L
Linus Torvalds 已提交
1430
 *
1431
 * Choose one configuration from configuration space defined by @params.
L
Linus Torvalds 已提交
1432 1433 1434 1435
 * The configuration chosen is that obtained fixing in this order:
 * first access, first format, first subformat, min channels,
 * min rate, min period time, max buffer size, min tick time
 */
1436 1437
int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
			     struct snd_pcm_hw_params *params)
L
Linus Torvalds 已提交
1438
{
1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450
	static int vars[] = {
		SNDRV_PCM_HW_PARAM_ACCESS,
		SNDRV_PCM_HW_PARAM_FORMAT,
		SNDRV_PCM_HW_PARAM_SUBFORMAT,
		SNDRV_PCM_HW_PARAM_CHANNELS,
		SNDRV_PCM_HW_PARAM_RATE,
		SNDRV_PCM_HW_PARAM_PERIOD_TIME,
		SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
		SNDRV_PCM_HW_PARAM_TICK_TIME,
		-1
	};
	int err, *v;
L
Linus Torvalds 已提交
1451

1452 1453 1454 1455 1456
	for (v = vars; *v != -1; v++) {
		if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
			err = snd_pcm_hw_param_first(pcm, params, *v, NULL);
		else
			err = snd_pcm_hw_param_last(pcm, params, *v, NULL);
1457 1458
		if (snd_BUG_ON(err < 0))
			return err;
1459
	}
L
Linus Torvalds 已提交
1460 1461 1462
	return 0;
}

T
Takashi Iwai 已提交
1463
static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
L
Linus Torvalds 已提交
1464 1465
				   void *arg)
{
T
Takashi Iwai 已提交
1466
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
1467 1468 1469 1470 1471 1472 1473
	unsigned long flags;
	snd_pcm_stream_lock_irqsave(substream, flags);
	if (snd_pcm_running(substream) &&
	    snd_pcm_update_hw_ptr(substream) >= 0)
		runtime->status->hw_ptr %= runtime->buffer_size;
	else
		runtime->status->hw_ptr = 0;
1474
	runtime->hw_ptr_jiffies = jiffies;
L
Linus Torvalds 已提交
1475 1476 1477 1478
	snd_pcm_stream_unlock_irqrestore(substream, flags);
	return 0;
}

T
Takashi Iwai 已提交
1479
static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
L
Linus Torvalds 已提交
1480 1481
					  void *arg)
{
T
Takashi Iwai 已提交
1482 1483
	struct snd_pcm_channel_info *info = arg;
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524
	int width;
	if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
		info->offset = -1;
		return 0;
	}
	width = snd_pcm_format_physical_width(runtime->format);
	if (width < 0)
		return width;
	info->offset = 0;
	switch (runtime->access) {
	case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
	case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
		info->first = info->channel * width;
		info->step = runtime->channels * width;
		break;
	case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
	case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
	{
		size_t size = runtime->dma_bytes / runtime->channels;
		info->first = info->channel * size * 8;
		info->step = width;
		break;
	}
	default:
		snd_BUG();
		break;
	}
	return 0;
}

/**
 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
 * @substream: the pcm substream instance
 * @cmd: ioctl command
 * @arg: ioctl argument
 *
 * Processes the generic ioctl commands for PCM.
 * Can be passed as the ioctl callback for PCM ops.
 *
 * Returns zero if successful, or a negative error code on failure.
 */
T
Takashi Iwai 已提交
1525
int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
L
Linus Torvalds 已提交
1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538
		      unsigned int cmd, void *arg)
{
	switch (cmd) {
	case SNDRV_PCM_IOCTL1_INFO:
		return 0;
	case SNDRV_PCM_IOCTL1_RESET:
		return snd_pcm_lib_ioctl_reset(substream, arg);
	case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
		return snd_pcm_lib_ioctl_channel_info(substream, arg);
	}
	return -ENXIO;
}

1539 1540
EXPORT_SYMBOL(snd_pcm_lib_ioctl);

L
Linus Torvalds 已提交
1541 1542 1543 1544 1545 1546
/**
 * snd_pcm_period_elapsed - update the pcm status for the next period
 * @substream: the pcm substream instance
 *
 * This function is called from the interrupt handler when the
 * PCM has processed the period size.  It will update the current
1547
 * pointer, wake up sleepers, etc.
L
Linus Torvalds 已提交
1548 1549 1550 1551
 *
 * Even if more than one periods have elapsed since the last call, you
 * have to call this only once.
 */
T
Takashi Iwai 已提交
1552
void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
L
Linus Torvalds 已提交
1553
{
T
Takashi Iwai 已提交
1554
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
1555 1556
	unsigned long flags;

1557 1558
	if (PCM_RUNTIME_CHECK(substream))
		return;
L
Linus Torvalds 已提交
1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577
	runtime = substream->runtime;

	if (runtime->transfer_ack_begin)
		runtime->transfer_ack_begin(substream);

	snd_pcm_stream_lock_irqsave(substream, flags);
	if (!snd_pcm_running(substream) ||
	    snd_pcm_update_hw_ptr_interrupt(substream) < 0)
		goto _end;

	if (substream->timer_running)
		snd_timer_interrupt(substream->timer, 1);
 _end:
	snd_pcm_stream_unlock_irqrestore(substream, flags);
	if (runtime->transfer_ack_end)
		runtime->transfer_ack_end(substream);
	kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
}

1578 1579
EXPORT_SYMBOL(snd_pcm_period_elapsed);

1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644
/*
 * Wait until avail_min data becomes available
 * Returns a negative error code if any error occurs during operation.
 * The available space is stored on availp.  When err = 0 and avail = 0
 * on the capture stream, it indicates the stream is in DRAINING state.
 */
static int wait_for_avail_min(struct snd_pcm_substream *substream,
			      snd_pcm_uframes_t *availp)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
	wait_queue_t wait;
	int err = 0;
	snd_pcm_uframes_t avail = 0;
	long tout;

	init_waitqueue_entry(&wait, current);
	add_wait_queue(&runtime->sleep, &wait);
	for (;;) {
		if (signal_pending(current)) {
			err = -ERESTARTSYS;
			break;
		}
		set_current_state(TASK_INTERRUPTIBLE);
		snd_pcm_stream_unlock_irq(substream);
		tout = schedule_timeout(msecs_to_jiffies(10000));
		snd_pcm_stream_lock_irq(substream);
		switch (runtime->status->state) {
		case SNDRV_PCM_STATE_SUSPENDED:
			err = -ESTRPIPE;
			goto _endloop;
		case SNDRV_PCM_STATE_XRUN:
			err = -EPIPE;
			goto _endloop;
		case SNDRV_PCM_STATE_DRAINING:
			if (is_playback)
				err = -EPIPE;
			else 
				avail = 0; /* indicate draining */
			goto _endloop;
		case SNDRV_PCM_STATE_OPEN:
		case SNDRV_PCM_STATE_SETUP:
		case SNDRV_PCM_STATE_DISCONNECTED:
			err = -EBADFD;
			goto _endloop;
		}
		if (!tout) {
			snd_printd("%s write error (DMA or IRQ trouble?)\n",
				   is_playback ? "playback" : "capture");
			err = -EIO;
			break;
		}
		if (is_playback)
			avail = snd_pcm_playback_avail(runtime);
		else
			avail = snd_pcm_capture_avail(runtime);
		if (avail >= runtime->control->avail_min)
			break;
	}
 _endloop:
	remove_wait_queue(&runtime->sleep, &wait);
	*availp = avail;
	return err;
}
	
T
Takashi Iwai 已提交
1645
static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream,
L
Linus Torvalds 已提交
1646 1647 1648 1649
				      unsigned int hwoff,
				      unsigned long data, unsigned int off,
				      snd_pcm_uframes_t frames)
{
T
Takashi Iwai 已提交
1650
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663
	int err;
	char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
	if (substream->ops->copy) {
		if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
			return err;
	} else {
		char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
		if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
			return -EFAULT;
	}
	return 0;
}
 
T
Takashi Iwai 已提交
1664
typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff,
L
Linus Torvalds 已提交
1665 1666 1667
			  unsigned long data, unsigned int off,
			  snd_pcm_uframes_t size);

T
Takashi Iwai 已提交
1668
static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream, 
L
Linus Torvalds 已提交
1669 1670 1671 1672 1673
					    unsigned long data,
					    snd_pcm_uframes_t size,
					    int nonblock,
					    transfer_f transfer)
{
T
Takashi Iwai 已提交
1674
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702
	snd_pcm_uframes_t xfer = 0;
	snd_pcm_uframes_t offset = 0;
	int err = 0;

	if (size == 0)
		return 0;

	snd_pcm_stream_lock_irq(substream);
	switch (runtime->status->state) {
	case SNDRV_PCM_STATE_PREPARED:
	case SNDRV_PCM_STATE_RUNNING:
	case SNDRV_PCM_STATE_PAUSED:
		break;
	case SNDRV_PCM_STATE_XRUN:
		err = -EPIPE;
		goto _end_unlock;
	case SNDRV_PCM_STATE_SUSPENDED:
		err = -ESTRPIPE;
		goto _end_unlock;
	default:
		err = -EBADFD;
		goto _end_unlock;
	}

	while (size > 0) {
		snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
		snd_pcm_uframes_t avail;
		snd_pcm_uframes_t cont;
1703
		if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
L
Linus Torvalds 已提交
1704 1705
			snd_pcm_update_hw_ptr(substream);
		avail = snd_pcm_playback_avail(runtime);
1706
		if (!avail) {
L
Linus Torvalds 已提交
1707 1708 1709 1710
			if (nonblock) {
				err = -EAGAIN;
				goto _end_unlock;
			}
1711 1712
			err = wait_for_avail_min(substream, &avail);
			if (err < 0)
1713
				goto _end_unlock;
L
Linus Torvalds 已提交
1714 1715 1716 1717 1718
		}
		frames = size > avail ? avail : size;
		cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
		if (frames > cont)
			frames = cont;
1719 1720 1721 1722
		if (snd_BUG_ON(!frames)) {
			snd_pcm_stream_unlock_irq(substream);
			return -EINVAL;
		}
L
Linus Torvalds 已提交
1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761
		appl_ptr = runtime->control->appl_ptr;
		appl_ofs = appl_ptr % runtime->buffer_size;
		snd_pcm_stream_unlock_irq(substream);
		if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0)
			goto _end;
		snd_pcm_stream_lock_irq(substream);
		switch (runtime->status->state) {
		case SNDRV_PCM_STATE_XRUN:
			err = -EPIPE;
			goto _end_unlock;
		case SNDRV_PCM_STATE_SUSPENDED:
			err = -ESTRPIPE;
			goto _end_unlock;
		default:
			break;
		}
		appl_ptr += frames;
		if (appl_ptr >= runtime->boundary)
			appl_ptr -= runtime->boundary;
		runtime->control->appl_ptr = appl_ptr;
		if (substream->ops->ack)
			substream->ops->ack(substream);

		offset += frames;
		size -= frames;
		xfer += frames;
		if (runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
		    snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
			err = snd_pcm_start(substream);
			if (err < 0)
				goto _end_unlock;
		}
	}
 _end_unlock:
	snd_pcm_stream_unlock_irq(substream);
 _end:
	return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
}

1762 1763
/* sanity-check for read/write methods */
static int pcm_sanity_check(struct snd_pcm_substream *substream)
L
Linus Torvalds 已提交
1764
{
T
Takashi Iwai 已提交
1765
	struct snd_pcm_runtime *runtime;
1766 1767
	if (PCM_RUNTIME_CHECK(substream))
		return -ENXIO;
L
Linus Torvalds 已提交
1768
	runtime = substream->runtime;
1769 1770
	if (snd_BUG_ON(!substream->ops->copy && !runtime->dma_area))
		return -EINVAL;
L
Linus Torvalds 已提交
1771 1772
	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
		return -EBADFD;
1773 1774 1775 1776 1777 1778 1779 1780
	return 0;
}

snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, const void __user *buf, snd_pcm_uframes_t size)
{
	struct snd_pcm_runtime *runtime;
	int nonblock;
	int err;
L
Linus Torvalds 已提交
1781

1782 1783 1784 1785
	err = pcm_sanity_check(substream);
	if (err < 0)
		return err;
	runtime = substream->runtime;
1786
	nonblock = !!(substream->f_flags & O_NONBLOCK);
L
Linus Torvalds 已提交
1787 1788 1789 1790 1791 1792 1793 1794

	if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
	    runtime->channels > 1)
		return -EINVAL;
	return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock,
				  snd_pcm_lib_write_transfer);
}

1795 1796
EXPORT_SYMBOL(snd_pcm_lib_write);

T
Takashi Iwai 已提交
1797
static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream,
L
Linus Torvalds 已提交
1798 1799 1800 1801
				       unsigned int hwoff,
				       unsigned long data, unsigned int off,
				       snd_pcm_uframes_t frames)
{
T
Takashi Iwai 已提交
1802
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
1803 1804 1805 1806 1807
	int err;
	void __user **bufs = (void __user **)data;
	int channels = runtime->channels;
	int c;
	if (substream->ops->copy) {
1808 1809
		if (snd_BUG_ON(!substream->ops->silence))
			return -EINVAL;
L
Linus Torvalds 已提交
1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836
		for (c = 0; c < channels; ++c, ++bufs) {
			if (*bufs == NULL) {
				if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0)
					return err;
			} else {
				char __user *buf = *bufs + samples_to_bytes(runtime, off);
				if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
					return err;
			}
		}
	} else {
		/* default transfer behaviour */
		size_t dma_csize = runtime->dma_bytes / channels;
		for (c = 0; c < channels; ++c, ++bufs) {
			char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
			if (*bufs == NULL) {
				snd_pcm_format_set_silence(runtime->format, hwbuf, frames);
			} else {
				char __user *buf = *bufs + samples_to_bytes(runtime, off);
				if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames)))
					return -EFAULT;
			}
		}
	}
	return 0;
}
 
T
Takashi Iwai 已提交
1837
snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
L
Linus Torvalds 已提交
1838 1839 1840
				     void __user **bufs,
				     snd_pcm_uframes_t frames)
{
T
Takashi Iwai 已提交
1841
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
1842
	int nonblock;
1843
	int err;
L
Linus Torvalds 已提交
1844

1845 1846 1847
	err = pcm_sanity_check(substream);
	if (err < 0)
		return err;
L
Linus Torvalds 已提交
1848
	runtime = substream->runtime;
1849
	nonblock = !!(substream->f_flags & O_NONBLOCK);
L
Linus Torvalds 已提交
1850 1851 1852 1853 1854 1855 1856

	if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
		return -EINVAL;
	return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames,
				  nonblock, snd_pcm_lib_writev_transfer);
}

1857 1858
EXPORT_SYMBOL(snd_pcm_lib_writev);

T
Takashi Iwai 已提交
1859
static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream, 
L
Linus Torvalds 已提交
1860 1861 1862 1863
				     unsigned int hwoff,
				     unsigned long data, unsigned int off,
				     snd_pcm_uframes_t frames)
{
T
Takashi Iwai 已提交
1864
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877
	int err;
	char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
	if (substream->ops->copy) {
		if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
			return err;
	} else {
		char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
		if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
			return -EFAULT;
	}
	return 0;
}

T
Takashi Iwai 已提交
1878
static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
L
Linus Torvalds 已提交
1879 1880 1881 1882 1883
					   unsigned long data,
					   snd_pcm_uframes_t size,
					   int nonblock,
					   transfer_f transfer)
{
T
Takashi Iwai 已提交
1884
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919
	snd_pcm_uframes_t xfer = 0;
	snd_pcm_uframes_t offset = 0;
	int err = 0;

	if (size == 0)
		return 0;

	snd_pcm_stream_lock_irq(substream);
	switch (runtime->status->state) {
	case SNDRV_PCM_STATE_PREPARED:
		if (size >= runtime->start_threshold) {
			err = snd_pcm_start(substream);
			if (err < 0)
				goto _end_unlock;
		}
		break;
	case SNDRV_PCM_STATE_DRAINING:
	case SNDRV_PCM_STATE_RUNNING:
	case SNDRV_PCM_STATE_PAUSED:
		break;
	case SNDRV_PCM_STATE_XRUN:
		err = -EPIPE;
		goto _end_unlock;
	case SNDRV_PCM_STATE_SUSPENDED:
		err = -ESTRPIPE;
		goto _end_unlock;
	default:
		err = -EBADFD;
		goto _end_unlock;
	}

	while (size > 0) {
		snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
		snd_pcm_uframes_t avail;
		snd_pcm_uframes_t cont;
1920
		if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
L
Linus Torvalds 已提交
1921 1922
			snd_pcm_update_hw_ptr(substream);
		avail = snd_pcm_capture_avail(runtime);
1923 1924 1925 1926
		if (!avail) {
			if (runtime->status->state ==
			    SNDRV_PCM_STATE_DRAINING) {
				snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
L
Linus Torvalds 已提交
1927 1928 1929 1930 1931 1932
				goto _end_unlock;
			}
			if (nonblock) {
				err = -EAGAIN;
				goto _end_unlock;
			}
1933 1934
			err = wait_for_avail_min(substream, &avail);
			if (err < 0)
1935
				goto _end_unlock;
1936 1937
			if (!avail)
				continue; /* draining */
L
Linus Torvalds 已提交
1938 1939 1940 1941 1942
		}
		frames = size > avail ? avail : size;
		cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
		if (frames > cont)
			frames = cont;
1943 1944 1945 1946
		if (snd_BUG_ON(!frames)) {
			snd_pcm_stream_unlock_irq(substream);
			return -EINVAL;
		}
L
Linus Torvalds 已提交
1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979
		appl_ptr = runtime->control->appl_ptr;
		appl_ofs = appl_ptr % runtime->buffer_size;
		snd_pcm_stream_unlock_irq(substream);
		if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0)
			goto _end;
		snd_pcm_stream_lock_irq(substream);
		switch (runtime->status->state) {
		case SNDRV_PCM_STATE_XRUN:
			err = -EPIPE;
			goto _end_unlock;
		case SNDRV_PCM_STATE_SUSPENDED:
			err = -ESTRPIPE;
			goto _end_unlock;
		default:
			break;
		}
		appl_ptr += frames;
		if (appl_ptr >= runtime->boundary)
			appl_ptr -= runtime->boundary;
		runtime->control->appl_ptr = appl_ptr;
		if (substream->ops->ack)
			substream->ops->ack(substream);

		offset += frames;
		size -= frames;
		xfer += frames;
	}
 _end_unlock:
	snd_pcm_stream_unlock_irq(substream);
 _end:
	return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
}

T
Takashi Iwai 已提交
1980
snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, void __user *buf, snd_pcm_uframes_t size)
L
Linus Torvalds 已提交
1981
{
T
Takashi Iwai 已提交
1982
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
1983
	int nonblock;
1984
	int err;
L
Linus Torvalds 已提交
1985
	
1986 1987 1988
	err = pcm_sanity_check(substream);
	if (err < 0)
		return err;
L
Linus Torvalds 已提交
1989
	runtime = substream->runtime;
1990
	nonblock = !!(substream->f_flags & O_NONBLOCK);
L
Linus Torvalds 已提交
1991 1992 1993 1994 1995
	if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED)
		return -EINVAL;
	return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer);
}

1996 1997
EXPORT_SYMBOL(snd_pcm_lib_read);

T
Takashi Iwai 已提交
1998
static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream,
L
Linus Torvalds 已提交
1999 2000 2001 2002
				      unsigned int hwoff,
				      unsigned long data, unsigned int off,
				      snd_pcm_uframes_t frames)
{
T
Takashi Iwai 已提交
2003
	struct snd_pcm_runtime *runtime = substream->runtime;
L
Linus Torvalds 已提交
2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033
	int err;
	void __user **bufs = (void __user **)data;
	int channels = runtime->channels;
	int c;
	if (substream->ops->copy) {
		for (c = 0; c < channels; ++c, ++bufs) {
			char __user *buf;
			if (*bufs == NULL)
				continue;
			buf = *bufs + samples_to_bytes(runtime, off);
			if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
				return err;
		}
	} else {
		snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
		for (c = 0; c < channels; ++c, ++bufs) {
			char *hwbuf;
			char __user *buf;
			if (*bufs == NULL)
				continue;

			hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
			buf = *bufs + samples_to_bytes(runtime, off);
			if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
				return -EFAULT;
		}
	}
	return 0;
}
 
T
Takashi Iwai 已提交
2034
snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
L
Linus Torvalds 已提交
2035 2036 2037
				    void __user **bufs,
				    snd_pcm_uframes_t frames)
{
T
Takashi Iwai 已提交
2038
	struct snd_pcm_runtime *runtime;
L
Linus Torvalds 已提交
2039
	int nonblock;
2040
	int err;
L
Linus Torvalds 已提交
2041

2042 2043 2044
	err = pcm_sanity_check(substream);
	if (err < 0)
		return err;
L
Linus Torvalds 已提交
2045 2046 2047 2048
	runtime = substream->runtime;
	if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
		return -EBADFD;

2049
	nonblock = !!(substream->f_flags & O_NONBLOCK);
L
Linus Torvalds 已提交
2050 2051 2052 2053 2054 2055
	if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
		return -EINVAL;
	return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer);
}

EXPORT_SYMBOL(snd_pcm_lib_readv);