pcm_lib.c 56.6 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1
2
/*
 *  Digital Audio (PCM) abstract layer
3
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
Linus Torvalds's avatar
Linus Torvalds committed
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
 *                   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>
25
#include <linux/math64.h>
Linus Torvalds's avatar
Linus Torvalds committed
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
#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
 */
42
void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr)
Linus Torvalds's avatar
Linus Torvalds committed
43
{
44
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
45
46
47
48
49
50
51
52
53
54
55
56
57
58
	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;
		}
Takashi Iwai's avatar
Takashi Iwai committed
59
		if (runtime->silence_filled >= runtime->buffer_size)
Linus Torvalds's avatar
Linus Torvalds committed
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
			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;
82
				runtime->silence_start = new_hw_ptr;
Linus Torvalds's avatar
Linus Torvalds committed
83
			} else {
84
				runtime->silence_start = ofs;
Linus Torvalds's avatar
Linus Torvalds committed
85
86
87
88
			}
		}
		frames = runtime->buffer_size - runtime->silence_filled;
	}
89
90
	if (snd_BUG_ON(frames > runtime->buffer_size))
		return;
Linus Torvalds's avatar
Linus Torvalds committed
91
92
	if (frames == 0)
		return;
93
	ofs = runtime->silence_start % runtime->buffer_size;
Linus Torvalds's avatar
Linus Torvalds committed
94
95
96
97
98
99
100
	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);
101
				snd_BUG_ON(err < 0);
Linus Torvalds's avatar
Linus Torvalds committed
102
103
104
105
106
107
108
109
110
111
112
			} 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);
113
					snd_BUG_ON(err < 0);
Linus Torvalds's avatar
Linus Torvalds committed
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
				}
			} 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;
	}
}

Takashi Iwai's avatar
Takashi Iwai committed
129
#ifdef CONFIG_SND_PCM_XRUN_DEBUG
130
#define xrun_debug(substream, mask)	((substream)->pstr->xrun_debug & (mask))
Takashi Iwai's avatar
Takashi Iwai committed
131
#else
132
#define xrun_debug(substream, mask)	0
Takashi Iwai's avatar
Takashi Iwai committed
133
134
#endif

135
136
137
#define dump_stack_on_xrun(substream) do {		\
		if (xrun_debug(substream, 2))		\
			dump_stack();			\
Takashi Iwai's avatar
Takashi Iwai committed
138
139
	} while (0)

140
141
142
143
144
145
146
147
148
149
static void pcm_debug_name(struct snd_pcm_substream *substream,
			   char *name, size_t len)
{
	snprintf(name, len, "pcmC%dD%d%c:%d",
		 substream->pcm->card->number,
		 substream->pcm->device,
		 substream->stream ? 'c' : 'p',
		 substream->number);
}

150
static void xrun(struct snd_pcm_substream *substream)
Linus Torvalds's avatar
Linus Torvalds committed
151
{
152
153
154
155
	struct snd_pcm_runtime *runtime = substream->runtime;

	if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
		snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
Linus Torvalds's avatar
Linus Torvalds committed
156
	snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
157
	if (xrun_debug(substream, 1)) {
158
159
160
		char name[16];
		pcm_debug_name(substream, name, sizeof(name));
		snd_printd(KERN_DEBUG "XRUN: %s\n", name);
Takashi Iwai's avatar
Takashi Iwai committed
161
		dump_stack_on_xrun(substream);
Linus Torvalds's avatar
Linus Torvalds committed
162
163
164
	}
}

165
166
167
static snd_pcm_uframes_t
snd_pcm_update_hw_ptr_pos(struct snd_pcm_substream *substream,
			  struct snd_pcm_runtime *runtime)
Linus Torvalds's avatar
Linus Torvalds committed
168
169
170
171
172
173
174
{
	snd_pcm_uframes_t pos;

	pos = substream->ops->pointer(substream);
	if (pos == SNDRV_PCM_POS_XRUN)
		return pos; /* XRUN */
	if (pos >= runtime->buffer_size) {
175
		if (printk_ratelimit()) {
176
177
178
			char name[16];
			pcm_debug_name(substream, name, sizeof(name));
			snd_printd(KERN_ERR  "BUG: %s, pos = 0x%lx, "
179
				   "buffer size = 0x%lx, period size = 0x%lx\n",
180
				   name, pos, runtime->buffer_size,
181
182
183
				   runtime->period_size);
		}
		pos = 0;
184
	}
Linus Torvalds's avatar
Linus Torvalds committed
185
186
187
188
	pos -= pos % runtime->min_align;
	return pos;
}

189
190
static int snd_pcm_update_hw_ptr_post(struct snd_pcm_substream *substream,
				      struct snd_pcm_runtime *runtime)
Linus Torvalds's avatar
Linus Torvalds committed
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
{
	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;
}

Takashi Iwai's avatar
Takashi Iwai committed
212
213
#define hw_ptr_error(substream, fmt, args...)				\
	do {								\
214
		if (xrun_debug(substream, 1)) {				\
Takashi Iwai's avatar
Takashi Iwai committed
215
			if (printk_ratelimit()) {			\
216
				snd_printd("PCM: " fmt, ##args);	\
Takashi Iwai's avatar
Takashi Iwai committed
217
218
219
220
221
			}						\
			dump_stack_on_xrun(substream);			\
		}							\
	} while (0)

222
static int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream *substream)
Linus Torvalds's avatar
Linus Torvalds committed
223
{
224
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
225
	snd_pcm_uframes_t pos;
226
227
228
	snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_ptr_interrupt, hw_base;
	snd_pcm_sframes_t hdelta, delta;
	unsigned long jdelta;
Linus Torvalds's avatar
Linus Torvalds committed
229

230
	old_hw_ptr = runtime->status->hw_ptr;
Linus Torvalds's avatar
Linus Torvalds committed
231
232
233
234
235
	pos = snd_pcm_update_hw_ptr_pos(substream, runtime);
	if (pos == SNDRV_PCM_POS_XRUN) {
		xrun(substream);
		return -EPIPE;
	}
Takashi Iwai's avatar
Takashi Iwai committed
236
237
	hw_base = runtime->hw_ptr_base;
	new_hw_ptr = hw_base + pos;
Linus Torvalds's avatar
Linus Torvalds committed
238
	hw_ptr_interrupt = runtime->hw_ptr_interrupt + runtime->period_size;
Takashi Iwai's avatar
Takashi Iwai committed
239
	delta = new_hw_ptr - hw_ptr_interrupt;
240
	if (hw_ptr_interrupt >= runtime->boundary) {
241
242
243
		hw_ptr_interrupt -= runtime->boundary;
		if (hw_base < runtime->boundary / 2)
			/* hw_base was already lapped; recalc delta */
244
245
			delta = new_hw_ptr - hw_ptr_interrupt;
	}
Takashi Iwai's avatar
Takashi Iwai committed
246
	if (delta < 0) {
247
248
		if (runtime->periods == 1)
			delta += runtime->buffer_size;
Takashi Iwai's avatar
Takashi Iwai committed
249
250
251
252
253
254
		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);
255
256
257
258
259
260
261
#if 1
			/* simply skipping the hwptr update seems more
			 * robust in some cases, e.g. on VMware with
			 * inaccurate timer source
			 */
			return 0; /* skip this update */
#else
Takashi Iwai's avatar
Takashi Iwai committed
262
263
			/* rebase to interrupt position */
			hw_base = new_hw_ptr = hw_ptr_interrupt;
264
265
			/* align hw_base to buffer_size */
			hw_base -= hw_base % runtime->buffer_size;
Takashi Iwai's avatar
Takashi Iwai committed
266
			delta = 0;
267
#endif
Takashi Iwai's avatar
Takashi Iwai committed
268
269
		} else {
			hw_base += runtime->buffer_size;
270
			if (hw_base >= runtime->boundary)
Takashi Iwai's avatar
Takashi Iwai committed
271
272
				hw_base = 0;
			new_hw_ptr = hw_base + pos;
Linus Torvalds's avatar
Linus Torvalds committed
273
274
		}
	}
275
276

	/* Do jiffies check only in xrun_debug mode */
277
	if (!xrun_debug(substream, 4))
278
279
		goto no_jiffies_check;

280
281
282
283
284
285
	/* Skip the jiffies check for hardwares with BATCH flag.
	 * Such hardware usually just increases the position at each IRQ,
	 * thus it can't give any strange position.
	 */
	if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
		goto no_jiffies_check;
286
	hdelta = new_hw_ptr - old_hw_ptr;
287
288
289
	if (hdelta < runtime->delay)
		goto no_jiffies_check;
	hdelta -= runtime->delay;
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
	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;
	}
312
 no_jiffies_check:
313
	if (delta > runtime->period_size + runtime->period_size / 2) {
Takashi Iwai's avatar
Takashi Iwai committed
314
315
316
317
318
319
320
321
322
		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;
	}
323
324
	runtime->hw_ptr_interrupt = hw_ptr_interrupt;

Linus Torvalds's avatar
Linus Torvalds committed
325
326
327
328
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
	    runtime->silence_size > 0)
		snd_pcm_playback_silence(substream, new_hw_ptr);

329
330
331
	if (runtime->status->hw_ptr == new_hw_ptr)
		return 0;

Takashi Iwai's avatar
Takashi Iwai committed
332
	runtime->hw_ptr_base = hw_base;
Linus Torvalds's avatar
Linus Torvalds committed
333
	runtime->status->hw_ptr = new_hw_ptr;
334
	runtime->hw_ptr_jiffies = jiffies;
335
336
	if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
		snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
Linus Torvalds's avatar
Linus Torvalds committed
337
338
339
340
341

	return snd_pcm_update_hw_ptr_post(substream, runtime);
}

/* CAUTION: call it with irq disabled */
342
int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
Linus Torvalds's avatar
Linus Torvalds committed
343
{
344
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
345
	snd_pcm_uframes_t pos;
Takashi Iwai's avatar
Takashi Iwai committed
346
	snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
Linus Torvalds's avatar
Linus Torvalds committed
347
	snd_pcm_sframes_t delta;
348
	unsigned long jdelta;
Linus Torvalds's avatar
Linus Torvalds committed
349
350
351
352
353
354
355

	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;
	}
Takashi Iwai's avatar
Takashi Iwai committed
356
357
	hw_base = runtime->hw_ptr_base;
	new_hw_ptr = hw_base + pos;
Linus Torvalds's avatar
Linus Torvalds committed
358

Takashi Iwai's avatar
Takashi Iwai committed
359
	delta = new_hw_ptr - old_hw_ptr;
360
	jdelta = jiffies - runtime->hw_ptr_jiffies;
Takashi Iwai's avatar
Takashi Iwai committed
361
362
363
364
365
	if (delta < 0) {
		delta += runtime->buffer_size;
		if (delta < 0) {
			hw_ptr_error(substream, 
				     "Unexpected hw_pointer value [2] "
366
				     "(stream=%i, pos=%ld, old_ptr=%ld, jdelta=%li)\n",
Takashi Iwai's avatar
Takashi Iwai committed
367
				     substream->stream, (long)pos,
368
				     (long)old_hw_ptr, jdelta);
Linus Torvalds's avatar
Linus Torvalds committed
369
370
			return 0;
		}
Takashi Iwai's avatar
Takashi Iwai committed
371
		hw_base += runtime->buffer_size;
372
		if (hw_base >= runtime->boundary)
Takashi Iwai's avatar
Takashi Iwai committed
373
374
375
			hw_base = 0;
		new_hw_ptr = hw_base + pos;
	}
376
	/* Do jiffies check only in xrun_debug mode */
377
378
379
380
381
382
	if (!xrun_debug(substream, 4))
		goto no_jiffies_check;
	if (delta < runtime->delay)
		goto no_jiffies_check;
	delta -= runtime->delay;
	if (((delta * HZ) / runtime->rate) > jdelta + HZ/100) {
Takashi Iwai's avatar
Takashi Iwai committed
383
384
		hw_ptr_error(substream,
			     "hw_ptr skipping! "
385
			     "(pos=%ld, delta=%ld, period=%ld, jdelta=%lu/%lu)\n",
Takashi Iwai's avatar
Takashi Iwai committed
386
			     (long)pos, (long)delta,
387
388
			     (long)runtime->period_size, jdelta,
			     ((delta * HZ) / runtime->rate));
Takashi Iwai's avatar
Takashi Iwai committed
389
		return 0;
Linus Torvalds's avatar
Linus Torvalds committed
390
	}
391
 no_jiffies_check:
Linus Torvalds's avatar
Linus Torvalds committed
392
393
394
395
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
	    runtime->silence_size > 0)
		snd_pcm_playback_silence(substream, new_hw_ptr);

396
	if (runtime->status->hw_ptr == new_hw_ptr)
397
398
		return 0;

Takashi Iwai's avatar
Takashi Iwai committed
399
	runtime->hw_ptr_base = hw_base;
Linus Torvalds's avatar
Linus Torvalds committed
400
	runtime->status->hw_ptr = new_hw_ptr;
401
	runtime->hw_ptr_jiffies = jiffies;
402
403
	if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
		snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
Linus Torvalds's avatar
Linus Torvalds committed
404
405
406
407
408
409
410
411
412
413
414
415

	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.
 */
416
void snd_pcm_set_ops(struct snd_pcm *pcm, int direction, struct snd_pcm_ops *ops)
Linus Torvalds's avatar
Linus Torvalds committed
417
{
418
419
	struct snd_pcm_str *stream = &pcm->streams[direction];
	struct snd_pcm_substream *substream;
Linus Torvalds's avatar
Linus Torvalds committed
420
421
422
423
424
	
	for (substream = stream->substream; substream != NULL; substream = substream->next)
		substream->ops = ops;
}

425
EXPORT_SYMBOL(snd_pcm_set_ops);
Linus Torvalds's avatar
Linus Torvalds committed
426
427
428
429
430
431
432

/**
 * snd_pcm_sync - set the PCM sync id
 * @substream: the pcm substream
 *
 * Sets the PCM sync identifier for the card.
 */
433
void snd_pcm_set_sync(struct snd_pcm_substream *substream)
Linus Torvalds's avatar
Linus Torvalds committed
434
{
435
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
436
437
438
439
440
441
442
	
	runtime->sync.id32[0] = substream->pcm->card->number;
	runtime->sync.id32[1] = -1;
	runtime->sync.id32[2] = -1;
	runtime->sync.id32[3] = -1;
}

443
444
EXPORT_SYMBOL(snd_pcm_set_sync);

Linus Torvalds's avatar
Linus Torvalds committed
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
/*
 *  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) {
493
		snd_BUG_ON(!n);
Linus Torvalds's avatar
Linus Torvalds committed
494
495
496
		*r = 0;
		return UINT_MAX;
	}
497
	n = div_u64_rem(n, c, r);
Linus Torvalds's avatar
Linus Torvalds committed
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
	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.
 */
516
int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
Linus Torvalds's avatar
Linus Torvalds committed
517
518
{
	int changed = 0;
519
520
	if (snd_BUG_ON(snd_interval_empty(i)))
		return -EINVAL;
Linus Torvalds's avatar
Linus Torvalds committed
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
	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;
}

559
560
EXPORT_SYMBOL(snd_interval_refine);

561
static int snd_interval_refine_first(struct snd_interval *i)
Linus Torvalds's avatar
Linus Torvalds committed
562
{
563
564
	if (snd_BUG_ON(snd_interval_empty(i)))
		return -EINVAL;
Linus Torvalds's avatar
Linus Torvalds committed
565
566
567
568
569
570
571
572
573
	if (snd_interval_single(i))
		return 0;
	i->max = i->min;
	i->openmax = i->openmin;
	if (i->openmax)
		i->max++;
	return 1;
}

574
static int snd_interval_refine_last(struct snd_interval *i)
Linus Torvalds's avatar
Linus Torvalds committed
575
{
576
577
	if (snd_BUG_ON(snd_interval_empty(i)))
		return -EINVAL;
Linus Torvalds's avatar
Linus Torvalds committed
578
579
580
581
582
583
584
585
586
	if (snd_interval_single(i))
		return 0;
	i->min = i->max;
	i->openmin = i->openmax;
	if (i->openmin)
		i->min--;
	return 1;
}

587
void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
Linus Torvalds's avatar
Linus Torvalds committed
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
{
	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
Takashi Iwai's avatar
Takashi Iwai committed
603
604
605
 * @a: dividend
 * @b: divisor
 * @c: quotient
Linus Torvalds's avatar
Linus Torvalds committed
606
607
608
609
610
 *
 * c = a / b
 *
 * Returns non-zero if the value is changed, zero if not changed.
 */
611
void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
Linus Torvalds's avatar
Linus Torvalds committed
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
{
	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
Takashi Iwai's avatar
Takashi Iwai committed
637
638
639
640
641
 * @a: dividend 1
 * @b: dividend 2
 * @k: divisor (as integer)
 * @c: result
  *
Linus Torvalds's avatar
Linus Torvalds committed
642
643
644
645
 * c = a * b / k
 *
 * Returns non-zero if the value is changed, zero if not changed.
 */
646
647
void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
		      unsigned int k, struct snd_interval *c)
Linus Torvalds's avatar
Linus Torvalds committed
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
{
	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
Takashi Iwai's avatar
Takashi Iwai committed
668
669
670
671
 * @a: dividend 1
 * @k: dividend 2 (as integer)
 * @b: divisor
 * @c: result
Linus Torvalds's avatar
Linus Torvalds committed
672
673
674
675
676
 *
 * c = a * k / b
 *
 * Returns non-zero if the value is changed, zero if not changed.
 */
677
678
void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
		      const struct snd_interval *b, struct snd_interval *c)
Linus Torvalds's avatar
Linus Torvalds committed
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
{
	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
Takashi Iwai's avatar
Takashi Iwai committed
707
708
709
710
711
 * @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
Linus Torvalds's avatar
Linus Torvalds committed
712
713
714
 *
 * Returns non-zero if the value is changed, zero if not changed.
 */
715
716
717
int snd_interval_ratnum(struct snd_interval *i,
			unsigned int rats_count, struct snd_ratnum *rats,
			unsigned int *nump, unsigned int *denp)
Linus Torvalds's avatar
Linus Torvalds committed
718
719
720
{
	unsigned int best_num, best_diff, best_den;
	unsigned int k;
721
	struct snd_interval t;
Linus Torvalds's avatar
Linus Torvalds committed
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
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
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
	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;
}

807
808
EXPORT_SYMBOL(snd_interval_ratnum);

Linus Torvalds's avatar
Linus Torvalds committed
809
810
/**
 * snd_interval_ratden - refine the interval value
Takashi Iwai's avatar
Takashi Iwai committed
811
 * @i: interval to refine
812
813
 * @rats_count: number of struct ratden
 * @rats: struct ratden array
Takashi Iwai's avatar
Takashi Iwai committed
814
815
 * @nump: pointer to store the resultant numerator
 * @denp: pointer to store the resultant denominator
Linus Torvalds's avatar
Linus Torvalds committed
816
817
818
 *
 * Returns non-zero if the value is changed, zero if not changed.
 */
819
820
static int snd_interval_ratden(struct snd_interval *i,
			       unsigned int rats_count, struct snd_ratden *rats,
Linus Torvalds's avatar
Linus Torvalds committed
821
822
823
824
			       unsigned int *nump, unsigned int *denp)
{
	unsigned int best_num, best_diff, best_den;
	unsigned int k;
825
	struct snd_interval t;
Linus Torvalds's avatar
Linus Torvalds committed
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
862
863
864
865
866
867
868
869
870
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
908
909
910
911
912
913
914
915
916
917
	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.
 */
918
int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask)
Linus Torvalds's avatar
Linus Torvalds committed
919
920
921
{
        unsigned int k;
	int changed = 0;
922
923
924
925
926

	if (!count) {
		i->empty = 1;
		return -EINVAL;
	}
Linus Torvalds's avatar
Linus Torvalds committed
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
        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;
}

964
965
EXPORT_SYMBOL(snd_interval_list);

966
static int snd_interval_step(struct snd_interval *i, unsigned int min, unsigned int step)
Linus Torvalds's avatar
Linus Torvalds committed
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
{
	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.
 */
1000
int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,