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1/*
2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 * Abramo Bagnara <abramo@alsa-project.org>
5 *
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 */
22
23#include <linux/slab.h>
24#include <linux/time.h>
25#include <linux/math64.h>
26#include <linux/export.h>
27#include <sound/core.h>
28#include <sound/control.h>
29#include <sound/tlv.h>
30#include <sound/info.h>
31#include <sound/pcm.h>
32#include <sound/pcm_params.h>
33#include <sound/timer.h>
34
35#ifdef CONFIG_SND_PCM_XRUN_DEBUG
36#define CREATE_TRACE_POINTS
37#include "pcm_trace.h"
38#else
39#define trace_hwptr(substream, pos, in_interrupt)
40#define trace_xrun(substream)
41#define trace_hw_ptr_error(substream, reason)
42#endif
43
44/*
45 * fill ring buffer with silence
46 * runtime->silence_start: starting pointer to silence area
47 * runtime->silence_filled: size filled with silence
48 * runtime->silence_threshold: threshold from application
49 * runtime->silence_size: maximal size from application
50 *
51 * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately
52 */
53void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr)
54{
55 struct snd_pcm_runtime *runtime = substream->runtime;
56 snd_pcm_uframes_t frames, ofs, transfer;
57
58 if (runtime->silence_size < runtime->boundary) {
59 snd_pcm_sframes_t noise_dist, n;
60 if (runtime->silence_start != runtime->control->appl_ptr) {
61 n = runtime->control->appl_ptr - runtime->silence_start;
62 if (n < 0)
63 n += runtime->boundary;
64 if ((snd_pcm_uframes_t)n < runtime->silence_filled)
65 runtime->silence_filled -= n;
66 else
67 runtime->silence_filled = 0;
68 runtime->silence_start = runtime->control->appl_ptr;
69 }
70 if (runtime->silence_filled >= runtime->buffer_size)
71 return;
72 noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
73 if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold)
74 return;
75 frames = runtime->silence_threshold - noise_dist;
76 if (frames > runtime->silence_size)
77 frames = runtime->silence_size;
78 } else {
79 if (new_hw_ptr == ULONG_MAX) { /* initialization */
80 snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime);
81 if (avail > runtime->buffer_size)
82 avail = runtime->buffer_size;
83 runtime->silence_filled = avail > 0 ? avail : 0;
84 runtime->silence_start = (runtime->status->hw_ptr +
85 runtime->silence_filled) %
86 runtime->boundary;
87 } else {
88 ofs = runtime->status->hw_ptr;
89 frames = new_hw_ptr - ofs;
90 if ((snd_pcm_sframes_t)frames < 0)
91 frames += runtime->boundary;
92 runtime->silence_filled -= frames;
93 if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
94 runtime->silence_filled = 0;
95 runtime->silence_start = new_hw_ptr;
96 } else {
97 runtime->silence_start = ofs;
98 }
99 }
100 frames = runtime->buffer_size - runtime->silence_filled;
101 }
102 if (snd_BUG_ON(frames > runtime->buffer_size))
103 return;
104 if (frames == 0)
105 return;
106 ofs = runtime->silence_start % runtime->buffer_size;
107 while (frames > 0) {
108 transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
109 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
110 runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) {
111 if (substream->ops->silence) {
112 int err;
113 err = substream->ops->silence(substream, -1, ofs, transfer);
114 snd_BUG_ON(err < 0);
115 } else {
116 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs);
117 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels);
118 }
119 } else {
120 unsigned int c;
121 unsigned int channels = runtime->channels;
122 if (substream->ops->silence) {
123 for (c = 0; c < channels; ++c) {
124 int err;
125 err = substream->ops->silence(substream, c, ofs, transfer);
126 snd_BUG_ON(err < 0);
127 }
128 } else {
129 size_t dma_csize = runtime->dma_bytes / channels;
130 for (c = 0; c < channels; ++c) {
131 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs);
132 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer);
133 }
134 }
135 }
136 runtime->silence_filled += transfer;
137 frames -= transfer;
138 ofs = 0;
139 }
140}
141
142#ifdef CONFIG_SND_DEBUG
143void snd_pcm_debug_name(struct snd_pcm_substream *substream,
144 char *name, size_t len)
145{
146 snprintf(name, len, "pcmC%dD%d%c:%d",
147 substream->pcm->card->number,
148 substream->pcm->device,
149 substream->stream ? 'c' : 'p',
150 substream->number);
151}
152EXPORT_SYMBOL(snd_pcm_debug_name);
153#endif
154
155#define XRUN_DEBUG_BASIC (1<<0)
156#define XRUN_DEBUG_STACK (1<<1) /* dump also stack */
157#define XRUN_DEBUG_JIFFIESCHECK (1<<2) /* do jiffies check */
158
159#ifdef CONFIG_SND_PCM_XRUN_DEBUG
160
161#define xrun_debug(substream, mask) \
162 ((substream)->pstr->xrun_debug & (mask))
163#else
164#define xrun_debug(substream, mask) 0
165#endif
166
167#define dump_stack_on_xrun(substream) do { \
168 if (xrun_debug(substream, XRUN_DEBUG_STACK)) \
169 dump_stack(); \
170 } while (0)
171
172static void xrun(struct snd_pcm_substream *substream)
173{
174 struct snd_pcm_runtime *runtime = substream->runtime;
175
176 trace_xrun(substream);
177 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
178 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
179 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
180 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {
181 char name[16];
182 snd_pcm_debug_name(substream, name, sizeof(name));
183 pcm_warn(substream->pcm, "XRUN: %s\n", name);
184 dump_stack_on_xrun(substream);
185 }
186}
187
188#ifdef CONFIG_SND_PCM_XRUN_DEBUG
189#define hw_ptr_error(substream, in_interrupt, reason, fmt, args...) \
190 do { \
191 trace_hw_ptr_error(substream, reason); \
192 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { \
193 pr_err_ratelimited("ALSA: PCM: [%c] " reason ": " fmt, \
194 (in_interrupt) ? 'Q' : 'P', ##args); \
195 dump_stack_on_xrun(substream); \
196 } \
197 } while (0)
198
199#else /* ! CONFIG_SND_PCM_XRUN_DEBUG */
200
201#define hw_ptr_error(substream, fmt, args...) do { } while (0)
202
203#endif
204
205int snd_pcm_update_state(struct snd_pcm_substream *substream,
206 struct snd_pcm_runtime *runtime)
207{
208 snd_pcm_uframes_t avail;
209
210 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
211 avail = snd_pcm_playback_avail(runtime);
212 else
213 avail = snd_pcm_capture_avail(runtime);
214 if (avail > runtime->avail_max)
215 runtime->avail_max = avail;
216 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
217 if (avail >= runtime->buffer_size) {
218 snd_pcm_drain_done(substream);
219 return -EPIPE;
220 }
221 } else {
222 if (avail >= runtime->stop_threshold) {
223 xrun(substream);
224 return -EPIPE;
225 }
226 }
227 if (runtime->twake) {
228 if (avail >= runtime->twake)
229 wake_up(&runtime->tsleep);
230 } else if (avail >= runtime->control->avail_min)
231 wake_up(&runtime->sleep);
232 return 0;
233}
234
235static void update_audio_tstamp(struct snd_pcm_substream *substream,
236 struct timespec *curr_tstamp,
237 struct timespec *audio_tstamp)
238{
239 struct snd_pcm_runtime *runtime = substream->runtime;
240 u64 audio_frames, audio_nsecs;
241 struct timespec driver_tstamp;
242
243 if (runtime->tstamp_mode != SNDRV_PCM_TSTAMP_ENABLE)
244 return;
245
246 if (!(substream->ops->get_time_info) ||
247 (runtime->audio_tstamp_report.actual_type ==
248 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)) {
249
250 /*
251 * provide audio timestamp derived from pointer position
252 * add delay only if requested
253 */
254
255 audio_frames = runtime->hw_ptr_wrap + runtime->status->hw_ptr;
256
257 if (runtime->audio_tstamp_config.report_delay) {
258 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
259 audio_frames -= runtime->delay;
260 else
261 audio_frames += runtime->delay;
262 }
263 audio_nsecs = div_u64(audio_frames * 1000000000LL,
264 runtime->rate);
265 *audio_tstamp = ns_to_timespec(audio_nsecs);
266 }
267 runtime->status->audio_tstamp = *audio_tstamp;
268 runtime->status->tstamp = *curr_tstamp;
269
270 /*
271 * re-take a driver timestamp to let apps detect if the reference tstamp
272 * read by low-level hardware was provided with a delay
273 */
274 snd_pcm_gettime(substream->runtime, (struct timespec *)&driver_tstamp);
275 runtime->driver_tstamp = driver_tstamp;
276}
277
278static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
279 unsigned int in_interrupt)
280{
281 struct snd_pcm_runtime *runtime = substream->runtime;
282 snd_pcm_uframes_t pos;
283 snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
284 snd_pcm_sframes_t hdelta, delta;
285 unsigned long jdelta;
286 unsigned long curr_jiffies;
287 struct timespec curr_tstamp;
288 struct timespec audio_tstamp;
289 int crossed_boundary = 0;
290
291 old_hw_ptr = runtime->status->hw_ptr;
292
293 /*
294 * group pointer, time and jiffies reads to allow for more
295 * accurate correlations/corrections.
296 * The values are stored at the end of this routine after
297 * corrections for hw_ptr position
298 */
299 pos = substream->ops->pointer(substream);
300 curr_jiffies = jiffies;
301 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
302 if ((substream->ops->get_time_info) &&
303 (runtime->audio_tstamp_config.type_requested != SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)) {
304 substream->ops->get_time_info(substream, &curr_tstamp,
305 &audio_tstamp,
306 &runtime->audio_tstamp_config,
307 &runtime->audio_tstamp_report);
308
309 /* re-test in case tstamp type is not supported in hardware and was demoted to DEFAULT */
310 if (runtime->audio_tstamp_report.actual_type == SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)
311 snd_pcm_gettime(runtime, (struct timespec *)&curr_tstamp);
312 } else
313 snd_pcm_gettime(runtime, (struct timespec *)&curr_tstamp);
314 }
315
316 if (pos == SNDRV_PCM_POS_XRUN) {
317 xrun(substream);
318 return -EPIPE;
319 }
320 if (pos >= runtime->buffer_size) {
321 if (printk_ratelimit()) {
322 char name[16];
323 snd_pcm_debug_name(substream, name, sizeof(name));
324 pcm_err(substream->pcm,
325 "invalid position: %s, pos = %ld, buffer size = %ld, period size = %ld\n",
326 name, pos, runtime->buffer_size,
327 runtime->period_size);
328 }
329 pos = 0;
330 }
331 pos -= pos % runtime->min_align;
332 trace_hwptr(substream, pos, in_interrupt);
333 hw_base = runtime->hw_ptr_base;
334 new_hw_ptr = hw_base + pos;
335 if (in_interrupt) {
336 /* we know that one period was processed */
337 /* delta = "expected next hw_ptr" for in_interrupt != 0 */
338 delta = runtime->hw_ptr_interrupt + runtime->period_size;
339 if (delta > new_hw_ptr) {
340 /* check for double acknowledged interrupts */
341 hdelta = curr_jiffies - runtime->hw_ptr_jiffies;
342 if (hdelta > runtime->hw_ptr_buffer_jiffies/2 + 1) {
343 hw_base += runtime->buffer_size;
344 if (hw_base >= runtime->boundary) {
345 hw_base = 0;
346 crossed_boundary++;
347 }
348 new_hw_ptr = hw_base + pos;
349 goto __delta;
350 }
351 }
352 }
353 /* new_hw_ptr might be lower than old_hw_ptr in case when */
354 /* pointer crosses the end of the ring buffer */
355 if (new_hw_ptr < old_hw_ptr) {
356 hw_base += runtime->buffer_size;
357 if (hw_base >= runtime->boundary) {
358 hw_base = 0;
359 crossed_boundary++;
360 }
361 new_hw_ptr = hw_base + pos;
362 }
363 __delta:
364 delta = new_hw_ptr - old_hw_ptr;
365 if (delta < 0)
366 delta += runtime->boundary;
367
368 if (runtime->no_period_wakeup) {
369 snd_pcm_sframes_t xrun_threshold;
370 /*
371 * Without regular period interrupts, we have to check
372 * the elapsed time to detect xruns.
373 */
374 jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
375 if (jdelta < runtime->hw_ptr_buffer_jiffies / 2)
376 goto no_delta_check;
377 hdelta = jdelta - delta * HZ / runtime->rate;
378 xrun_threshold = runtime->hw_ptr_buffer_jiffies / 2 + 1;
379 while (hdelta > xrun_threshold) {
380 delta += runtime->buffer_size;
381 hw_base += runtime->buffer_size;
382 if (hw_base >= runtime->boundary) {
383 hw_base = 0;
384 crossed_boundary++;
385 }
386 new_hw_ptr = hw_base + pos;
387 hdelta -= runtime->hw_ptr_buffer_jiffies;
388 }
389 goto no_delta_check;
390 }
391
392 /* something must be really wrong */
393 if (delta >= runtime->buffer_size + runtime->period_size) {
394 hw_ptr_error(substream, in_interrupt, "Unexpected hw_ptr",
395 "(stream=%i, pos=%ld, new_hw_ptr=%ld, old_hw_ptr=%ld)\n",
396 substream->stream, (long)pos,
397 (long)new_hw_ptr, (long)old_hw_ptr);
398 return 0;
399 }
400
401 /* Do jiffies check only in xrun_debug mode */
402 if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
403 goto no_jiffies_check;
404
405 /* Skip the jiffies check for hardwares with BATCH flag.
406 * Such hardware usually just increases the position at each IRQ,
407 * thus it can't give any strange position.
408 */
409 if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
410 goto no_jiffies_check;
411 hdelta = delta;
412 if (hdelta < runtime->delay)
413 goto no_jiffies_check;
414 hdelta -= runtime->delay;
415 jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
416 if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
417 delta = jdelta /
418 (((runtime->period_size * HZ) / runtime->rate)
419 + HZ/100);
420 /* move new_hw_ptr according jiffies not pos variable */
421 new_hw_ptr = old_hw_ptr;
422 hw_base = delta;
423 /* use loop to avoid checks for delta overflows */
424 /* the delta value is small or zero in most cases */
425 while (delta > 0) {
426 new_hw_ptr += runtime->period_size;
427 if (new_hw_ptr >= runtime->boundary) {
428 new_hw_ptr -= runtime->boundary;
429 crossed_boundary--;
430 }
431 delta--;
432 }
433 /* align hw_base to buffer_size */
434 hw_ptr_error(substream, in_interrupt, "hw_ptr skipping",
435 "(pos=%ld, delta=%ld, period=%ld, jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
436 (long)pos, (long)hdelta,
437 (long)runtime->period_size, jdelta,
438 ((hdelta * HZ) / runtime->rate), hw_base,
439 (unsigned long)old_hw_ptr,
440 (unsigned long)new_hw_ptr);
441 /* reset values to proper state */
442 delta = 0;
443 hw_base = new_hw_ptr - (new_hw_ptr % runtime->buffer_size);
444 }
445 no_jiffies_check:
446 if (delta > runtime->period_size + runtime->period_size / 2) {
447 hw_ptr_error(substream, in_interrupt,
448 "Lost interrupts?",
449 "(stream=%i, delta=%ld, new_hw_ptr=%ld, old_hw_ptr=%ld)\n",
450 substream->stream, (long)delta,
451 (long)new_hw_ptr,
452 (long)old_hw_ptr);
453 }
454
455 no_delta_check:
456 if (runtime->status->hw_ptr == new_hw_ptr) {
457 update_audio_tstamp(substream, &curr_tstamp, &audio_tstamp);
458 return 0;
459 }
460
461 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
462 runtime->silence_size > 0)
463 snd_pcm_playback_silence(substream, new_hw_ptr);
464
465 if (in_interrupt) {
466 delta = new_hw_ptr - runtime->hw_ptr_interrupt;
467 if (delta < 0)
468 delta += runtime->boundary;
469 delta -= (snd_pcm_uframes_t)delta % runtime->period_size;
470 runtime->hw_ptr_interrupt += delta;
471 if (runtime->hw_ptr_interrupt >= runtime->boundary)
472 runtime->hw_ptr_interrupt -= runtime->boundary;
473 }
474 runtime->hw_ptr_base = hw_base;
475 runtime->status->hw_ptr = new_hw_ptr;
476 runtime->hw_ptr_jiffies = curr_jiffies;
477 if (crossed_boundary) {
478 snd_BUG_ON(crossed_boundary != 1);
479 runtime->hw_ptr_wrap += runtime->boundary;
480 }
481
482 update_audio_tstamp(substream, &curr_tstamp, &audio_tstamp);
483
484 return snd_pcm_update_state(substream, runtime);
485}
486
487/* CAUTION: call it with irq disabled */
488int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
489{
490 return snd_pcm_update_hw_ptr0(substream, 0);
491}
492
493/**
494 * snd_pcm_set_ops - set the PCM operators
495 * @pcm: the pcm instance
496 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
497 * @ops: the operator table
498 *
499 * Sets the given PCM operators to the pcm instance.
500 */
501void snd_pcm_set_ops(struct snd_pcm *pcm, int direction,
502 const struct snd_pcm_ops *ops)
503{
504 struct snd_pcm_str *stream = &pcm->streams[direction];
505 struct snd_pcm_substream *substream;
506
507 for (substream = stream->substream; substream != NULL; substream = substream->next)
508 substream->ops = ops;
509}
510
511EXPORT_SYMBOL(snd_pcm_set_ops);
512
513/**
514 * snd_pcm_sync - set the PCM sync id
515 * @substream: the pcm substream
516 *
517 * Sets the PCM sync identifier for the card.
518 */
519void snd_pcm_set_sync(struct snd_pcm_substream *substream)
520{
521 struct snd_pcm_runtime *runtime = substream->runtime;
522
523 runtime->sync.id32[0] = substream->pcm->card->number;
524 runtime->sync.id32[1] = -1;
525 runtime->sync.id32[2] = -1;
526 runtime->sync.id32[3] = -1;
527}
528
529EXPORT_SYMBOL(snd_pcm_set_sync);
530
531/*
532 * Standard ioctl routine
533 */
534
535static inline unsigned int div32(unsigned int a, unsigned int b,
536 unsigned int *r)
537{
538 if (b == 0) {
539 *r = 0;
540 return UINT_MAX;
541 }
542 *r = a % b;
543 return a / b;
544}
545
546static inline unsigned int div_down(unsigned int a, unsigned int b)
547{
548 if (b == 0)
549 return UINT_MAX;
550 return a / b;
551}
552
553static inline unsigned int div_up(unsigned int a, unsigned int b)
554{
555 unsigned int r;
556 unsigned int q;
557 if (b == 0)
558 return UINT_MAX;
559 q = div32(a, b, &r);
560 if (r)
561 ++q;
562 return q;
563}
564
565static inline unsigned int mul(unsigned int a, unsigned int b)
566{
567 if (a == 0)
568 return 0;
569 if (div_down(UINT_MAX, a) < b)
570 return UINT_MAX;
571 return a * b;
572}
573
574static inline unsigned int muldiv32(unsigned int a, unsigned int b,
575 unsigned int c, unsigned int *r)
576{
577 u_int64_t n = (u_int64_t) a * b;
578 if (c == 0) {
579 snd_BUG_ON(!n);
580 *r = 0;
581 return UINT_MAX;
582 }
583 n = div_u64_rem(n, c, r);
584 if (n >= UINT_MAX) {
585 *r = 0;
586 return UINT_MAX;
587 }
588 return n;
589}
590
591/**
592 * snd_interval_refine - refine the interval value of configurator
593 * @i: the interval value to refine
594 * @v: the interval value to refer to
595 *
596 * Refines the interval value with the reference value.
597 * The interval is changed to the range satisfying both intervals.
598 * The interval status (min, max, integer, etc.) are evaluated.
599 *
600 * Return: Positive if the value is changed, zero if it's not changed, or a
601 * negative error code.
602 */
603int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
604{
605 int changed = 0;
606 if (snd_BUG_ON(snd_interval_empty(i)))
607 return -EINVAL;
608 if (i->min < v->min) {
609 i->min = v->min;
610 i->openmin = v->openmin;
611 changed = 1;
612 } else if (i->min == v->min && !i->openmin && v->openmin) {
613 i->openmin = 1;
614 changed = 1;
615 }
616 if (i->max > v->max) {
617 i->max = v->max;
618 i->openmax = v->openmax;
619 changed = 1;
620 } else if (i->max == v->max && !i->openmax && v->openmax) {
621 i->openmax = 1;
622 changed = 1;
623 }
624 if (!i->integer && v->integer) {
625 i->integer = 1;
626 changed = 1;
627 }
628 if (i->integer) {
629 if (i->openmin) {
630 i->min++;
631 i->openmin = 0;
632 }
633 if (i->openmax) {
634 i->max--;
635 i->openmax = 0;
636 }
637 } else if (!i->openmin && !i->openmax && i->min == i->max)
638 i->integer = 1;
639 if (snd_interval_checkempty(i)) {
640 snd_interval_none(i);
641 return -EINVAL;
642 }
643 return changed;
644}
645
646EXPORT_SYMBOL(snd_interval_refine);
647
648static int snd_interval_refine_first(struct snd_interval *i)
649{
650 if (snd_BUG_ON(snd_interval_empty(i)))
651 return -EINVAL;
652 if (snd_interval_single(i))
653 return 0;
654 i->max = i->min;
655 i->openmax = i->openmin;
656 if (i->openmax)
657 i->max++;
658 return 1;
659}
660
661static int snd_interval_refine_last(struct snd_interval *i)
662{
663 if (snd_BUG_ON(snd_interval_empty(i)))
664 return -EINVAL;
665 if (snd_interval_single(i))
666 return 0;
667 i->min = i->max;
668 i->openmin = i->openmax;
669 if (i->openmin)
670 i->min--;
671 return 1;
672}
673
674void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
675{
676 if (a->empty || b->empty) {
677 snd_interval_none(c);
678 return;
679 }
680 c->empty = 0;
681 c->min = mul(a->min, b->min);
682 c->openmin = (a->openmin || b->openmin);
683 c->max = mul(a->max, b->max);
684 c->openmax = (a->openmax || b->openmax);
685 c->integer = (a->integer && b->integer);
686}
687
688/**
689 * snd_interval_div - refine the interval value with division
690 * @a: dividend
691 * @b: divisor
692 * @c: quotient
693 *
694 * c = a / b
695 *
696 * Returns non-zero if the value is changed, zero if not changed.
697 */
698void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
699{
700 unsigned int r;
701 if (a->empty || b->empty) {
702 snd_interval_none(c);
703 return;
704 }
705 c->empty = 0;
706 c->min = div32(a->min, b->max, &r);
707 c->openmin = (r || a->openmin || b->openmax);
708 if (b->min > 0) {
709 c->max = div32(a->max, b->min, &r);
710 if (r) {
711 c->max++;
712 c->openmax = 1;
713 } else
714 c->openmax = (a->openmax || b->openmin);
715 } else {
716 c->max = UINT_MAX;
717 c->openmax = 0;
718 }
719 c->integer = 0;
720}
721
722/**
723 * snd_interval_muldivk - refine the interval value
724 * @a: dividend 1
725 * @b: dividend 2
726 * @k: divisor (as integer)
727 * @c: result
728 *
729 * c = a * b / k
730 *
731 * Returns non-zero if the value is changed, zero if not changed.
732 */
733void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
734 unsigned int k, struct snd_interval *c)
735{
736 unsigned int r;
737 if (a->empty || b->empty) {
738 snd_interval_none(c);
739 return;
740 }
741 c->empty = 0;
742 c->min = muldiv32(a->min, b->min, k, &r);
743 c->openmin = (r || a->openmin || b->openmin);
744 c->max = muldiv32(a->max, b->max, k, &r);
745 if (r) {
746 c->max++;
747 c->openmax = 1;
748 } else
749 c->openmax = (a->openmax || b->openmax);
750 c->integer = 0;
751}
752
753/**
754 * snd_interval_mulkdiv - refine the interval value
755 * @a: dividend 1
756 * @k: dividend 2 (as integer)
757 * @b: divisor
758 * @c: result
759 *
760 * c = a * k / b
761 *
762 * Returns non-zero if the value is changed, zero if not changed.
763 */
764void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
765 const struct snd_interval *b, struct snd_interval *c)
766{
767 unsigned int r;
768 if (a->empty || b->empty) {
769 snd_interval_none(c);
770 return;
771 }
772 c->empty = 0;
773 c->min = muldiv32(a->min, k, b->max, &r);
774 c->openmin = (r || a->openmin || b->openmax);
775 if (b->min > 0) {
776 c->max = muldiv32(a->max, k, b->min, &r);
777 if (r) {
778 c->max++;
779 c->openmax = 1;
780 } else
781 c->openmax = (a->openmax || b->openmin);
782 } else {
783 c->max = UINT_MAX;
784 c->openmax = 0;
785 }
786 c->integer = 0;
787}
788
789/* ---- */
790
791
792/**
793 * snd_interval_ratnum - refine the interval value
794 * @i: interval to refine
795 * @rats_count: number of ratnum_t
796 * @rats: ratnum_t array
797 * @nump: pointer to store the resultant numerator
798 * @denp: pointer to store the resultant denominator
799 *
800 * Return: Positive if the value is changed, zero if it's not changed, or a
801 * negative error code.
802 */
803int snd_interval_ratnum(struct snd_interval *i,
804 unsigned int rats_count, const struct snd_ratnum *rats,
805 unsigned int *nump, unsigned int *denp)
806{
807 unsigned int best_num, best_den;
808 int best_diff;
809 unsigned int k;
810 struct snd_interval t;
811 int err;
812 unsigned int result_num, result_den;
813 int result_diff;
814
815 best_num = best_den = best_diff = 0;
816 for (k = 0; k < rats_count; ++k) {
817 unsigned int num = rats[k].num;
818 unsigned int den;
819 unsigned int q = i->min;
820 int diff;
821 if (q == 0)
822 q = 1;
823 den = div_up(num, q);
824 if (den < rats[k].den_min)
825 continue;
826 if (den > rats[k].den_max)
827 den = rats[k].den_max;
828 else {
829 unsigned int r;
830 r = (den - rats[k].den_min) % rats[k].den_step;
831 if (r != 0)
832 den -= r;
833 }
834 diff = num - q * den;
835 if (diff < 0)
836 diff = -diff;
837 if (best_num == 0 ||
838 diff * best_den < best_diff * den) {
839 best_diff = diff;
840 best_den = den;
841 best_num = num;
842 }
843 }
844 if (best_den == 0) {
845 i->empty = 1;
846 return -EINVAL;
847 }
848 t.min = div_down(best_num, best_den);
849 t.openmin = !!(best_num % best_den);
850
851 result_num = best_num;
852 result_diff = best_diff;
853 result_den = best_den;
854 best_num = best_den = best_diff = 0;
855 for (k = 0; k < rats_count; ++k) {
856 unsigned int num = rats[k].num;
857 unsigned int den;
858 unsigned int q = i->max;
859 int diff;
860 if (q == 0) {
861 i->empty = 1;
862 return -EINVAL;
863 }
864 den = div_down(num, q);
865 if (den > rats[k].den_max)
866 continue;
867 if (den < rats[k].den_min)
868 den = rats[k].den_min;
869 else {
870 unsigned int r;
871 r = (den - rats[k].den_min) % rats[k].den_step;
872 if (r != 0)
873 den += rats[k].den_step - r;
874 }
875 diff = q * den - num;
876 if (diff < 0)
877 diff = -diff;
878 if (best_num == 0 ||
879 diff * best_den < best_diff * den) {
880 best_diff = diff;
881 best_den = den;
882 best_num = num;
883 }
884 }
885 if (best_den == 0) {
886 i->empty = 1;
887 return -EINVAL;
888 }
889 t.max = div_up(best_num, best_den);
890 t.openmax = !!(best_num % best_den);
891 t.integer = 0;
892 err = snd_interval_refine(i, &t);
893 if (err < 0)
894 return err;
895
896 if (snd_interval_single(i)) {
897 if (best_diff * result_den < result_diff * best_den) {
898 result_num = best_num;
899 result_den = best_den;
900 }
901 if (nump)
902 *nump = result_num;
903 if (denp)
904 *denp = result_den;
905 }
906 return err;
907}
908
909EXPORT_SYMBOL(snd_interval_ratnum);
910
911/**
912 * snd_interval_ratden - refine the interval value
913 * @i: interval to refine
914 * @rats_count: number of struct ratden
915 * @rats: struct ratden array
916 * @nump: pointer to store the resultant numerator
917 * @denp: pointer to store the resultant denominator
918 *
919 * Return: Positive if the value is changed, zero if it's not changed, or a
920 * negative error code.
921 */
922static int snd_interval_ratden(struct snd_interval *i,
923 unsigned int rats_count,
924 const struct snd_ratden *rats,
925 unsigned int *nump, unsigned int *denp)
926{
927 unsigned int best_num, best_diff, best_den;
928 unsigned int k;
929 struct snd_interval t;
930 int err;
931
932 best_num = best_den = best_diff = 0;
933 for (k = 0; k < rats_count; ++k) {
934 unsigned int num;
935 unsigned int den = rats[k].den;
936 unsigned int q = i->min;
937 int diff;
938 num = mul(q, den);
939 if (num > rats[k].num_max)
940 continue;
941 if (num < rats[k].num_min)
942 num = rats[k].num_max;
943 else {
944 unsigned int r;
945 r = (num - rats[k].num_min) % rats[k].num_step;
946 if (r != 0)
947 num += rats[k].num_step - r;
948 }
949 diff = num - q * den;
950 if (best_num == 0 ||
951 diff * best_den < best_diff * den) {
952 best_diff = diff;
953 best_den = den;
954 best_num = num;
955 }
956 }
957 if (best_den == 0) {
958 i->empty = 1;
959 return -EINVAL;
960 }
961 t.min = div_down(best_num, best_den);
962 t.openmin = !!(best_num % best_den);
963
964 best_num = best_den = best_diff = 0;
965 for (k = 0; k < rats_count; ++k) {
966 unsigned int num;
967 unsigned int den = rats[k].den;
968 unsigned int q = i->max;
969 int diff;
970 num = mul(q, den);
971 if (num < rats[k].num_min)
972 continue;
973 if (num > rats[k].num_max)
974 num = rats[k].num_max;
975 else {
976 unsigned int r;
977 r = (num - rats[k].num_min) % rats[k].num_step;
978 if (r != 0)
979 num -= r;
980 }
981 diff = q * den - num;
982 if (best_num == 0 ||
983 diff * best_den < best_diff * den) {
984 best_diff = diff;
985 best_den = den;
986 best_num = num;
987 }
988 }
989 if (best_den == 0) {
990 i->empty = 1;
991 return -EINVAL;
992 }
993 t.max = div_up(best_num, best_den);
994 t.openmax = !!(best_num % best_den);
995 t.integer = 0;
996 err = snd_interval_refine(i, &t);
997 if (err < 0)
998 return err;
999
1000 if (snd_interval_single(i)) {
1001 if (nump)
1002 *nump = best_num;
1003 if (denp)
1004 *denp = best_den;
1005 }
1006 return err;
1007}
1008
1009/**
1010 * snd_interval_list - refine the interval value from the list
1011 * @i: the interval value to refine
1012 * @count: the number of elements in the list
1013 * @list: the value list
1014 * @mask: the bit-mask to evaluate
1015 *
1016 * Refines the interval value from the list.
1017 * When mask is non-zero, only the elements corresponding to bit 1 are
1018 * evaluated.
1019 *
1020 * Return: Positive if the value is changed, zero if it's not changed, or a
1021 * negative error code.
1022 */
1023int snd_interval_list(struct snd_interval *i, unsigned int count,
1024 const unsigned int *list, unsigned int mask)
1025{
1026 unsigned int k;
1027 struct snd_interval list_range;
1028
1029 if (!count) {
1030 i->empty = 1;
1031 return -EINVAL;
1032 }
1033 snd_interval_any(&list_range);
1034 list_range.min = UINT_MAX;
1035 list_range.max = 0;
1036 for (k = 0; k < count; k++) {
1037 if (mask && !(mask & (1 << k)))
1038 continue;
1039 if (!snd_interval_test(i, list[k]))
1040 continue;
1041 list_range.min = min(list_range.min, list[k]);
1042 list_range.max = max(list_range.max, list[k]);
1043 }
1044 return snd_interval_refine(i, &list_range);
1045}
1046
1047EXPORT_SYMBOL(snd_interval_list);
1048
1049/**
1050 * snd_interval_ranges - refine the interval value from the list of ranges
1051 * @i: the interval value to refine
1052 * @count: the number of elements in the list of ranges
1053 * @ranges: the ranges list
1054 * @mask: the bit-mask to evaluate
1055 *
1056 * Refines the interval value from the list of ranges.
1057 * When mask is non-zero, only the elements corresponding to bit 1 are
1058 * evaluated.
1059 *
1060 * Return: Positive if the value is changed, zero if it's not changed, or a
1061 * negative error code.
1062 */
1063int snd_interval_ranges(struct snd_interval *i, unsigned int count,
1064 const struct snd_interval *ranges, unsigned int mask)
1065{
1066 unsigned int k;
1067 struct snd_interval range_union;
1068 struct snd_interval range;
1069
1070 if (!count) {
1071 snd_interval_none(i);
1072 return -EINVAL;
1073 }
1074 snd_interval_any(&range_union);
1075 range_union.min = UINT_MAX;
1076 range_union.max = 0;
1077 for (k = 0; k < count; k++) {
1078 if (mask && !(mask & (1 << k)))
1079 continue;
1080 snd_interval_copy(&range, &ranges[k]);
1081 if (snd_interval_refine(&range, i) < 0)
1082 continue;
1083 if (snd_interval_empty(&range))
1084 continue;
1085
1086 if (range.min < range_union.min) {
1087 range_union.min = range.min;
1088 range_union.openmin = 1;
1089 }
1090 if (range.min == range_union.min && !range.openmin)
1091 range_union.openmin = 0;
1092 if (range.max > range_union.max) {
1093 range_union.max = range.max;
1094 range_union.openmax = 1;
1095 }
1096 if (range.max == range_union.max && !range.openmax)
1097 range_union.openmax = 0;
1098 }
1099 return snd_interval_refine(i, &range_union);
1100}
1101EXPORT_SYMBOL(snd_interval_ranges);
1102
1103static int snd_interval_step(struct snd_interval *i, unsigned int step)
1104{
1105 unsigned int n;
1106 int changed = 0;
1107 n = i->min % step;
1108 if (n != 0 || i->openmin) {
1109 i->min += step - n;
1110 i->openmin = 0;
1111 changed = 1;
1112 }
1113 n = i->max % step;
1114 if (n != 0 || i->openmax) {
1115 i->max -= n;
1116 i->openmax = 0;
1117 changed = 1;
1118 }
1119 if (snd_interval_checkempty(i)) {
1120 i->empty = 1;
1121 return -EINVAL;
1122 }
1123 return changed;
1124}
1125
1126/* Info constraints helpers */
1127
1128/**
1129 * snd_pcm_hw_rule_add - add the hw-constraint rule
1130 * @runtime: the pcm runtime instance
1131 * @cond: condition bits
1132 * @var: the variable to evaluate
1133 * @func: the evaluation function
1134 * @private: the private data pointer passed to function
1135 * @dep: the dependent variables
1136 *
1137 * Return: Zero if successful, or a negative error code on failure.
1138 */
1139int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
1140 int var,
1141 snd_pcm_hw_rule_func_t func, void *private,
1142 int dep, ...)
1143{
1144 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1145 struct snd_pcm_hw_rule *c;
1146 unsigned int k;
1147 va_list args;
1148 va_start(args, dep);
1149 if (constrs->rules_num >= constrs->rules_all) {
1150 struct snd_pcm_hw_rule *new;
1151 unsigned int new_rules = constrs->rules_all + 16;
1152 new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
1153 if (!new) {
1154 va_end(args);
1155 return -ENOMEM;
1156 }
1157 if (constrs->rules) {
1158 memcpy(new, constrs->rules,
1159 constrs->rules_num * sizeof(*c));
1160 kfree(constrs->rules);
1161 }
1162 constrs->rules = new;
1163 constrs->rules_all = new_rules;
1164 }
1165 c = &constrs->rules[constrs->rules_num];
1166 c->cond = cond;
1167 c->func = func;
1168 c->var = var;
1169 c->private = private;
1170 k = 0;
1171 while (1) {
1172 if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps))) {
1173 va_end(args);
1174 return -EINVAL;
1175 }
1176 c->deps[k++] = dep;
1177 if (dep < 0)
1178 break;
1179 dep = va_arg(args, int);
1180 }
1181 constrs->rules_num++;
1182 va_end(args);
1183 return 0;
1184}
1185
1186EXPORT_SYMBOL(snd_pcm_hw_rule_add);
1187
1188/**
1189 * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
1190 * @runtime: PCM runtime instance
1191 * @var: hw_params variable to apply the mask
1192 * @mask: the bitmap mask
1193 *
1194 * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
1195 *
1196 * Return: Zero if successful, or a negative error code on failure.
1197 */
1198int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1199 u_int32_t mask)
1200{
1201 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1202 struct snd_mask *maskp = constrs_mask(constrs, var);
1203 *maskp->bits &= mask;
1204 memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
1205 if (*maskp->bits == 0)
1206 return -EINVAL;
1207 return 0;
1208}
1209
1210/**
1211 * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
1212 * @runtime: PCM runtime instance
1213 * @var: hw_params variable to apply the mask
1214 * @mask: the 64bit bitmap mask
1215 *
1216 * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
1217 *
1218 * Return: Zero if successful, or a negative error code on failure.
1219 */
1220int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1221 u_int64_t mask)
1222{
1223 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1224 struct snd_mask *maskp = constrs_mask(constrs, var);
1225 maskp->bits[0] &= (u_int32_t)mask;
1226 maskp->bits[1] &= (u_int32_t)(mask >> 32);
1227 memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
1228 if (! maskp->bits[0] && ! maskp->bits[1])
1229 return -EINVAL;
1230 return 0;
1231}
1232EXPORT_SYMBOL(snd_pcm_hw_constraint_mask64);
1233
1234/**
1235 * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
1236 * @runtime: PCM runtime instance
1237 * @var: hw_params variable to apply the integer constraint
1238 *
1239 * Apply the constraint of integer to an interval parameter.
1240 *
1241 * Return: Positive if the value is changed, zero if it's not changed, or a
1242 * negative error code.
1243 */
1244int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
1245{
1246 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1247 return snd_interval_setinteger(constrs_interval(constrs, var));
1248}
1249
1250EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
1251
1252/**
1253 * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
1254 * @runtime: PCM runtime instance
1255 * @var: hw_params variable to apply the range
1256 * @min: the minimal value
1257 * @max: the maximal value
1258 *
1259 * Apply the min/max range constraint to an interval parameter.
1260 *
1261 * Return: Positive if the value is changed, zero if it's not changed, or a
1262 * negative error code.
1263 */
1264int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1265 unsigned int min, unsigned int max)
1266{
1267 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1268 struct snd_interval t;
1269 t.min = min;
1270 t.max = max;
1271 t.openmin = t.openmax = 0;
1272 t.integer = 0;
1273 return snd_interval_refine(constrs_interval(constrs, var), &t);
1274}
1275
1276EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
1277
1278static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
1279 struct snd_pcm_hw_rule *rule)
1280{
1281 struct snd_pcm_hw_constraint_list *list = rule->private;
1282 return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
1283}
1284
1285
1286/**
1287 * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
1288 * @runtime: PCM runtime instance
1289 * @cond: condition bits
1290 * @var: hw_params variable to apply the list constraint
1291 * @l: list
1292 *
1293 * Apply the list of constraints to an interval parameter.
1294 *
1295 * Return: Zero if successful, or a negative error code on failure.
1296 */
1297int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1298 unsigned int cond,
1299 snd_pcm_hw_param_t var,
1300 const struct snd_pcm_hw_constraint_list *l)
1301{
1302 return snd_pcm_hw_rule_add(runtime, cond, var,
1303 snd_pcm_hw_rule_list, (void *)l,
1304 var, -1);
1305}
1306
1307EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
1308
1309static int snd_pcm_hw_rule_ranges(struct snd_pcm_hw_params *params,
1310 struct snd_pcm_hw_rule *rule)
1311{
1312 struct snd_pcm_hw_constraint_ranges *r = rule->private;
1313 return snd_interval_ranges(hw_param_interval(params, rule->var),
1314 r->count, r->ranges, r->mask);
1315}
1316
1317
1318/**
1319 * snd_pcm_hw_constraint_ranges - apply list of range constraints to a parameter
1320 * @runtime: PCM runtime instance
1321 * @cond: condition bits
1322 * @var: hw_params variable to apply the list of range constraints
1323 * @r: ranges
1324 *
1325 * Apply the list of range constraints to an interval parameter.
1326 *
1327 * Return: Zero if successful, or a negative error code on failure.
1328 */
1329int snd_pcm_hw_constraint_ranges(struct snd_pcm_runtime *runtime,
1330 unsigned int cond,
1331 snd_pcm_hw_param_t var,
1332 const struct snd_pcm_hw_constraint_ranges *r)
1333{
1334 return snd_pcm_hw_rule_add(runtime, cond, var,
1335 snd_pcm_hw_rule_ranges, (void *)r,
1336 var, -1);
1337}
1338EXPORT_SYMBOL(snd_pcm_hw_constraint_ranges);
1339
1340static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
1341 struct snd_pcm_hw_rule *rule)
1342{
1343 const struct snd_pcm_hw_constraint_ratnums *r = rule->private;
1344 unsigned int num = 0, den = 0;
1345 int err;
1346 err = snd_interval_ratnum(hw_param_interval(params, rule->var),
1347 r->nrats, r->rats, &num, &den);
1348 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1349 params->rate_num = num;
1350 params->rate_den = den;
1351 }
1352 return err;
1353}
1354
1355/**
1356 * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
1357 * @runtime: PCM runtime instance
1358 * @cond: condition bits
1359 * @var: hw_params variable to apply the ratnums constraint
1360 * @r: struct snd_ratnums constriants
1361 *
1362 * Return: Zero if successful, or a negative error code on failure.
1363 */
1364int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1365 unsigned int cond,
1366 snd_pcm_hw_param_t var,
1367 const struct snd_pcm_hw_constraint_ratnums *r)
1368{
1369 return snd_pcm_hw_rule_add(runtime, cond, var,
1370 snd_pcm_hw_rule_ratnums, (void *)r,
1371 var, -1);
1372}
1373
1374EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
1375
1376static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
1377 struct snd_pcm_hw_rule *rule)
1378{
1379 const struct snd_pcm_hw_constraint_ratdens *r = rule->private;
1380 unsigned int num = 0, den = 0;
1381 int err = snd_interval_ratden(hw_param_interval(params, rule->var),
1382 r->nrats, r->rats, &num, &den);
1383 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1384 params->rate_num = num;
1385 params->rate_den = den;
1386 }
1387 return err;
1388}
1389
1390/**
1391 * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
1392 * @runtime: PCM runtime instance
1393 * @cond: condition bits
1394 * @var: hw_params variable to apply the ratdens constraint
1395 * @r: struct snd_ratdens constriants
1396 *
1397 * Return: Zero if successful, or a negative error code on failure.
1398 */
1399int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1400 unsigned int cond,
1401 snd_pcm_hw_param_t var,
1402 const struct snd_pcm_hw_constraint_ratdens *r)
1403{
1404 return snd_pcm_hw_rule_add(runtime, cond, var,
1405 snd_pcm_hw_rule_ratdens, (void *)r,
1406 var, -1);
1407}
1408
1409EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
1410
1411static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
1412 struct snd_pcm_hw_rule *rule)
1413{
1414 unsigned int l = (unsigned long) rule->private;
1415 int width = l & 0xffff;
1416 unsigned int msbits = l >> 16;
1417 struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
1418
1419 if (!snd_interval_single(i))
1420 return 0;
1421
1422 if ((snd_interval_value(i) == width) ||
1423 (width == 0 && snd_interval_value(i) > msbits))
1424 params->msbits = min_not_zero(params->msbits, msbits);
1425
1426 return 0;
1427}
1428
1429/**
1430 * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
1431 * @runtime: PCM runtime instance
1432 * @cond: condition bits
1433 * @width: sample bits width
1434 * @msbits: msbits width
1435 *
1436 * This constraint will set the number of most significant bits (msbits) if a
1437 * sample format with the specified width has been select. If width is set to 0
1438 * the msbits will be set for any sample format with a width larger than the
1439 * specified msbits.
1440 *
1441 * Return: Zero if successful, or a negative error code on failure.
1442 */
1443int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1444 unsigned int cond,
1445 unsigned int width,
1446 unsigned int msbits)
1447{
1448 unsigned long l = (msbits << 16) | width;
1449 return snd_pcm_hw_rule_add(runtime, cond, -1,
1450 snd_pcm_hw_rule_msbits,
1451 (void*) l,
1452 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1453}
1454
1455EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
1456
1457static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
1458 struct snd_pcm_hw_rule *rule)
1459{
1460 unsigned long step = (unsigned long) rule->private;
1461 return snd_interval_step(hw_param_interval(params, rule->var), step);
1462}
1463
1464/**
1465 * snd_pcm_hw_constraint_step - add a hw constraint step rule
1466 * @runtime: PCM runtime instance
1467 * @cond: condition bits
1468 * @var: hw_params variable to apply the step constraint
1469 * @step: step size
1470 *
1471 * Return: Zero if successful, or a negative error code on failure.
1472 */
1473int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1474 unsigned int cond,
1475 snd_pcm_hw_param_t var,
1476 unsigned long step)
1477{
1478 return snd_pcm_hw_rule_add(runtime, cond, var,
1479 snd_pcm_hw_rule_step, (void *) step,
1480 var, -1);
1481}
1482
1483EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
1484
1485static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
1486{
1487 static unsigned int pow2_sizes[] = {
1488 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1489 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1490 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1491 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1492 };
1493 return snd_interval_list(hw_param_interval(params, rule->var),
1494 ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
1495}
1496
1497/**
1498 * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
1499 * @runtime: PCM runtime instance
1500 * @cond: condition bits
1501 * @var: hw_params variable to apply the power-of-2 constraint
1502 *
1503 * Return: Zero if successful, or a negative error code on failure.
1504 */
1505int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1506 unsigned int cond,
1507 snd_pcm_hw_param_t var)
1508{
1509 return snd_pcm_hw_rule_add(runtime, cond, var,
1510 snd_pcm_hw_rule_pow2, NULL,
1511 var, -1);
1512}
1513
1514EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
1515
1516static int snd_pcm_hw_rule_noresample_func(struct snd_pcm_hw_params *params,
1517 struct snd_pcm_hw_rule *rule)
1518{
1519 unsigned int base_rate = (unsigned int)(uintptr_t)rule->private;
1520 struct snd_interval *rate;
1521
1522 rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1523 return snd_interval_list(rate, 1, &base_rate, 0);
1524}
1525
1526/**
1527 * snd_pcm_hw_rule_noresample - add a rule to allow disabling hw resampling
1528 * @runtime: PCM runtime instance
1529 * @base_rate: the rate at which the hardware does not resample
1530 *
1531 * Return: Zero if successful, or a negative error code on failure.
1532 */
1533int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
1534 unsigned int base_rate)
1535{
1536 return snd_pcm_hw_rule_add(runtime, SNDRV_PCM_HW_PARAMS_NORESAMPLE,
1537 SNDRV_PCM_HW_PARAM_RATE,
1538 snd_pcm_hw_rule_noresample_func,
1539 (void *)(uintptr_t)base_rate,
1540 SNDRV_PCM_HW_PARAM_RATE, -1);
1541}
1542EXPORT_SYMBOL(snd_pcm_hw_rule_noresample);
1543
1544static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
1545 snd_pcm_hw_param_t var)
1546{
1547 if (hw_is_mask(var)) {
1548 snd_mask_any(hw_param_mask(params, var));
1549 params->cmask |= 1 << var;
1550 params->rmask |= 1 << var;
1551 return;
1552 }
1553 if (hw_is_interval(var)) {
1554 snd_interval_any(hw_param_interval(params, var));
1555 params->cmask |= 1 << var;
1556 params->rmask |= 1 << var;
1557 return;
1558 }
1559 snd_BUG();
1560}
1561
1562void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
1563{
1564 unsigned int k;
1565 memset(params, 0, sizeof(*params));
1566 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1567 _snd_pcm_hw_param_any(params, k);
1568 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1569 _snd_pcm_hw_param_any(params, k);
1570 params->info = ~0U;
1571}
1572
1573EXPORT_SYMBOL(_snd_pcm_hw_params_any);
1574
1575/**
1576 * snd_pcm_hw_param_value - return @params field @var value
1577 * @params: the hw_params instance
1578 * @var: parameter to retrieve
1579 * @dir: pointer to the direction (-1,0,1) or %NULL
1580 *
1581 * Return: The value for field @var if it's fixed in configuration space
1582 * defined by @params. -%EINVAL otherwise.
1583 */
1584int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
1585 snd_pcm_hw_param_t var, int *dir)
1586{
1587 if (hw_is_mask(var)) {
1588 const struct snd_mask *mask = hw_param_mask_c(params, var);
1589 if (!snd_mask_single(mask))
1590 return -EINVAL;
1591 if (dir)
1592 *dir = 0;
1593 return snd_mask_value(mask);
1594 }
1595 if (hw_is_interval(var)) {
1596 const struct snd_interval *i = hw_param_interval_c(params, var);
1597 if (!snd_interval_single(i))
1598 return -EINVAL;
1599 if (dir)
1600 *dir = i->openmin;
1601 return snd_interval_value(i);
1602 }
1603 return -EINVAL;
1604}
1605
1606EXPORT_SYMBOL(snd_pcm_hw_param_value);
1607
1608void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
1609 snd_pcm_hw_param_t var)
1610{
1611 if (hw_is_mask(var)) {
1612 snd_mask_none(hw_param_mask(params, var));
1613 params->cmask |= 1 << var;
1614 params->rmask |= 1 << var;
1615 } else if (hw_is_interval(var)) {
1616 snd_interval_none(hw_param_interval(params, var));
1617 params->cmask |= 1 << var;
1618 params->rmask |= 1 << var;
1619 } else {
1620 snd_BUG();
1621 }
1622}
1623
1624EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
1625
1626static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
1627 snd_pcm_hw_param_t var)
1628{
1629 int changed;
1630 if (hw_is_mask(var))
1631 changed = snd_mask_refine_first(hw_param_mask(params, var));
1632 else if (hw_is_interval(var))
1633 changed = snd_interval_refine_first(hw_param_interval(params, var));
1634 else
1635 return -EINVAL;
1636 if (changed) {
1637 params->cmask |= 1 << var;
1638 params->rmask |= 1 << var;
1639 }
1640 return changed;
1641}
1642
1643
1644/**
1645 * snd_pcm_hw_param_first - refine config space and return minimum value
1646 * @pcm: PCM instance
1647 * @params: the hw_params instance
1648 * @var: parameter to retrieve
1649 * @dir: pointer to the direction (-1,0,1) or %NULL
1650 *
1651 * Inside configuration space defined by @params remove from @var all
1652 * values > minimum. Reduce configuration space accordingly.
1653 *
1654 * Return: The minimum, or a negative error code on failure.
1655 */
1656int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
1657 struct snd_pcm_hw_params *params,
1658 snd_pcm_hw_param_t var, int *dir)
1659{
1660 int changed = _snd_pcm_hw_param_first(params, var);
1661 if (changed < 0)
1662 return changed;
1663 if (params->rmask) {
1664 int err = snd_pcm_hw_refine(pcm, params);
1665 if (snd_BUG_ON(err < 0))
1666 return err;
1667 }
1668 return snd_pcm_hw_param_value(params, var, dir);
1669}
1670
1671EXPORT_SYMBOL(snd_pcm_hw_param_first);
1672
1673static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
1674 snd_pcm_hw_param_t var)
1675{
1676 int changed;
1677 if (hw_is_mask(var))
1678 changed = snd_mask_refine_last(hw_param_mask(params, var));
1679 else if (hw_is_interval(var))
1680 changed = snd_interval_refine_last(hw_param_interval(params, var));
1681 else
1682 return -EINVAL;
1683 if (changed) {
1684 params->cmask |= 1 << var;
1685 params->rmask |= 1 << var;
1686 }
1687 return changed;
1688}
1689
1690
1691/**
1692 * snd_pcm_hw_param_last - refine config space and return maximum value
1693 * @pcm: PCM instance
1694 * @params: the hw_params instance
1695 * @var: parameter to retrieve
1696 * @dir: pointer to the direction (-1,0,1) or %NULL
1697 *
1698 * Inside configuration space defined by @params remove from @var all
1699 * values < maximum. Reduce configuration space accordingly.
1700 *
1701 * Return: The maximum, or a negative error code on failure.
1702 */
1703int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
1704 struct snd_pcm_hw_params *params,
1705 snd_pcm_hw_param_t var, int *dir)
1706{
1707 int changed = _snd_pcm_hw_param_last(params, var);
1708 if (changed < 0)
1709 return changed;
1710 if (params->rmask) {
1711 int err = snd_pcm_hw_refine(pcm, params);
1712 if (snd_BUG_ON(err < 0))
1713 return err;
1714 }
1715 return snd_pcm_hw_param_value(params, var, dir);
1716}
1717
1718EXPORT_SYMBOL(snd_pcm_hw_param_last);
1719
1720/**
1721 * snd_pcm_hw_param_choose - choose a configuration defined by @params
1722 * @pcm: PCM instance
1723 * @params: the hw_params instance
1724 *
1725 * Choose one configuration from configuration space defined by @params.
1726 * The configuration chosen is that obtained fixing in this order:
1727 * first access, first format, first subformat, min channels,
1728 * min rate, min period time, max buffer size, min tick time
1729 *
1730 * Return: Zero if successful, or a negative error code on failure.
1731 */
1732int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
1733 struct snd_pcm_hw_params *params)
1734{
1735 static int vars[] = {
1736 SNDRV_PCM_HW_PARAM_ACCESS,
1737 SNDRV_PCM_HW_PARAM_FORMAT,
1738 SNDRV_PCM_HW_PARAM_SUBFORMAT,
1739 SNDRV_PCM_HW_PARAM_CHANNELS,
1740 SNDRV_PCM_HW_PARAM_RATE,
1741 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1742 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1743 SNDRV_PCM_HW_PARAM_TICK_TIME,
1744 -1
1745 };
1746 int err, *v;
1747
1748 for (v = vars; *v != -1; v++) {
1749 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
1750 err = snd_pcm_hw_param_first(pcm, params, *v, NULL);
1751 else
1752 err = snd_pcm_hw_param_last(pcm, params, *v, NULL);
1753 if (snd_BUG_ON(err < 0))
1754 return err;
1755 }
1756 return 0;
1757}
1758
1759static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
1760 void *arg)
1761{
1762 struct snd_pcm_runtime *runtime = substream->runtime;
1763 unsigned long flags;
1764 snd_pcm_stream_lock_irqsave(substream, flags);
1765 if (snd_pcm_running(substream) &&
1766 snd_pcm_update_hw_ptr(substream) >= 0)
1767 runtime->status->hw_ptr %= runtime->buffer_size;
1768 else {
1769 runtime->status->hw_ptr = 0;
1770 runtime->hw_ptr_wrap = 0;
1771 }
1772 snd_pcm_stream_unlock_irqrestore(substream, flags);
1773 return 0;
1774}
1775
1776static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
1777 void *arg)
1778{
1779 struct snd_pcm_channel_info *info = arg;
1780 struct snd_pcm_runtime *runtime = substream->runtime;
1781 int width;
1782 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1783 info->offset = -1;
1784 return 0;
1785 }
1786 width = snd_pcm_format_physical_width(runtime->format);
1787 if (width < 0)
1788 return width;
1789 info->offset = 0;
1790 switch (runtime->access) {
1791 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1792 case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1793 info->first = info->channel * width;
1794 info->step = runtime->channels * width;
1795 break;
1796 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1797 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1798 {
1799 size_t size = runtime->dma_bytes / runtime->channels;
1800 info->first = info->channel * size * 8;
1801 info->step = width;
1802 break;
1803 }
1804 default:
1805 snd_BUG();
1806 break;
1807 }
1808 return 0;
1809}
1810
1811static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
1812 void *arg)
1813{
1814 struct snd_pcm_hw_params *params = arg;
1815 snd_pcm_format_t format;
1816 int channels;
1817 ssize_t frame_size;
1818
1819 params->fifo_size = substream->runtime->hw.fifo_size;
1820 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) {
1821 format = params_format(params);
1822 channels = params_channels(params);
1823 frame_size = snd_pcm_format_size(format, channels);
1824 if (frame_size > 0)
1825 params->fifo_size /= (unsigned)frame_size;
1826 }
1827 return 0;
1828}
1829
1830/**
1831 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1832 * @substream: the pcm substream instance
1833 * @cmd: ioctl command
1834 * @arg: ioctl argument
1835 *
1836 * Processes the generic ioctl commands for PCM.
1837 * Can be passed as the ioctl callback for PCM ops.
1838 *
1839 * Return: Zero if successful, or a negative error code on failure.
1840 */
1841int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1842 unsigned int cmd, void *arg)
1843{
1844 switch (cmd) {
1845 case SNDRV_PCM_IOCTL1_INFO:
1846 return 0;
1847 case SNDRV_PCM_IOCTL1_RESET:
1848 return snd_pcm_lib_ioctl_reset(substream, arg);
1849 case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1850 return snd_pcm_lib_ioctl_channel_info(substream, arg);
1851 case SNDRV_PCM_IOCTL1_FIFO_SIZE:
1852 return snd_pcm_lib_ioctl_fifo_size(substream, arg);
1853 }
1854 return -ENXIO;
1855}
1856
1857EXPORT_SYMBOL(snd_pcm_lib_ioctl);
1858
1859/**
1860 * snd_pcm_period_elapsed - update the pcm status for the next period
1861 * @substream: the pcm substream instance
1862 *
1863 * This function is called from the interrupt handler when the
1864 * PCM has processed the period size. It will update the current
1865 * pointer, wake up sleepers, etc.
1866 *
1867 * Even if more than one periods have elapsed since the last call, you
1868 * have to call this only once.
1869 */
1870void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
1871{
1872 struct snd_pcm_runtime *runtime;
1873 unsigned long flags;
1874
1875 if (PCM_RUNTIME_CHECK(substream))
1876 return;
1877 runtime = substream->runtime;
1878
1879 snd_pcm_stream_lock_irqsave(substream, flags);
1880 if (!snd_pcm_running(substream) ||
1881 snd_pcm_update_hw_ptr0(substream, 1) < 0)
1882 goto _end;
1883
1884#ifdef CONFIG_SND_PCM_TIMER
1885 if (substream->timer_running)
1886 snd_timer_interrupt(substream->timer, 1);
1887#endif
1888 _end:
1889 kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
1890 snd_pcm_stream_unlock_irqrestore(substream, flags);
1891}
1892
1893EXPORT_SYMBOL(snd_pcm_period_elapsed);
1894
1895/*
1896 * Wait until avail_min data becomes available
1897 * Returns a negative error code if any error occurs during operation.
1898 * The available space is stored on availp. When err = 0 and avail = 0
1899 * on the capture stream, it indicates the stream is in DRAINING state.
1900 */
1901static int wait_for_avail(struct snd_pcm_substream *substream,
1902 snd_pcm_uframes_t *availp)
1903{
1904 struct snd_pcm_runtime *runtime = substream->runtime;
1905 int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
1906 wait_queue_t wait;
1907 int err = 0;
1908 snd_pcm_uframes_t avail = 0;
1909 long wait_time, tout;
1910
1911 init_waitqueue_entry(&wait, current);
1912 set_current_state(TASK_INTERRUPTIBLE);
1913 add_wait_queue(&runtime->tsleep, &wait);
1914
1915 if (runtime->no_period_wakeup)
1916 wait_time = MAX_SCHEDULE_TIMEOUT;
1917 else {
1918 wait_time = 10;
1919 if (runtime->rate) {
1920 long t = runtime->period_size * 2 / runtime->rate;
1921 wait_time = max(t, wait_time);
1922 }
1923 wait_time = msecs_to_jiffies(wait_time * 1000);
1924 }
1925
1926 for (;;) {
1927 if (signal_pending(current)) {
1928 err = -ERESTARTSYS;
1929 break;
1930 }
1931
1932 /*
1933 * We need to check if space became available already
1934 * (and thus the wakeup happened already) first to close
1935 * the race of space already having become available.
1936 * This check must happen after been added to the waitqueue
1937 * and having current state be INTERRUPTIBLE.
1938 */
1939 if (is_playback)
1940 avail = snd_pcm_playback_avail(runtime);
1941 else
1942 avail = snd_pcm_capture_avail(runtime);
1943 if (avail >= runtime->twake)
1944 break;
1945 snd_pcm_stream_unlock_irq(substream);
1946
1947 tout = schedule_timeout(wait_time);
1948
1949 snd_pcm_stream_lock_irq(substream);
1950 set_current_state(TASK_INTERRUPTIBLE);
1951 switch (runtime->status->state) {
1952 case SNDRV_PCM_STATE_SUSPENDED:
1953 err = -ESTRPIPE;
1954 goto _endloop;
1955 case SNDRV_PCM_STATE_XRUN:
1956 err = -EPIPE;
1957 goto _endloop;
1958 case SNDRV_PCM_STATE_DRAINING:
1959 if (is_playback)
1960 err = -EPIPE;
1961 else
1962 avail = 0; /* indicate draining */
1963 goto _endloop;
1964 case SNDRV_PCM_STATE_OPEN:
1965 case SNDRV_PCM_STATE_SETUP:
1966 case SNDRV_PCM_STATE_DISCONNECTED:
1967 err = -EBADFD;
1968 goto _endloop;
1969 case SNDRV_PCM_STATE_PAUSED:
1970 continue;
1971 }
1972 if (!tout) {
1973 pcm_dbg(substream->pcm,
1974 "%s write error (DMA or IRQ trouble?)\n",
1975 is_playback ? "playback" : "capture");
1976 err = -EIO;
1977 break;
1978 }
1979 }
1980 _endloop:
1981 set_current_state(TASK_RUNNING);
1982 remove_wait_queue(&runtime->tsleep, &wait);
1983 *availp = avail;
1984 return err;
1985}
1986
1987static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream,
1988 unsigned int hwoff,
1989 unsigned long data, unsigned int off,
1990 snd_pcm_uframes_t frames)
1991{
1992 struct snd_pcm_runtime *runtime = substream->runtime;
1993 int err;
1994 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
1995 if (substream->ops->copy) {
1996 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
1997 return err;
1998 } else {
1999 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
2000 if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
2001 return -EFAULT;
2002 }
2003 return 0;
2004}
2005
2006typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff,
2007 unsigned long data, unsigned int off,
2008 snd_pcm_uframes_t size);
2009
2010static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
2011 unsigned long data,
2012 snd_pcm_uframes_t size,
2013 int nonblock,
2014 transfer_f transfer)
2015{
2016 struct snd_pcm_runtime *runtime = substream->runtime;
2017 snd_pcm_uframes_t xfer = 0;
2018 snd_pcm_uframes_t offset = 0;
2019 snd_pcm_uframes_t avail;
2020 int err = 0;
2021
2022 if (size == 0)
2023 return 0;
2024
2025 snd_pcm_stream_lock_irq(substream);
2026 switch (runtime->status->state) {
2027 case SNDRV_PCM_STATE_PREPARED:
2028 case SNDRV_PCM_STATE_RUNNING:
2029 case SNDRV_PCM_STATE_PAUSED:
2030 break;
2031 case SNDRV_PCM_STATE_XRUN:
2032 err = -EPIPE;
2033 goto _end_unlock;
2034 case SNDRV_PCM_STATE_SUSPENDED:
2035 err = -ESTRPIPE;
2036 goto _end_unlock;
2037 default:
2038 err = -EBADFD;
2039 goto _end_unlock;
2040 }
2041
2042 runtime->twake = runtime->control->avail_min ? : 1;
2043 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2044 snd_pcm_update_hw_ptr(substream);
2045 avail = snd_pcm_playback_avail(runtime);
2046 while (size > 0) {
2047 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2048 snd_pcm_uframes_t cont;
2049 if (!avail) {
2050 if (nonblock) {
2051 err = -EAGAIN;
2052 goto _end_unlock;
2053 }
2054 runtime->twake = min_t(snd_pcm_uframes_t, size,
2055 runtime->control->avail_min ? : 1);
2056 err = wait_for_avail(substream, &avail);
2057 if (err < 0)
2058 goto _end_unlock;
2059 }
2060 frames = size > avail ? avail : size;
2061 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2062 if (frames > cont)
2063 frames = cont;
2064 if (snd_BUG_ON(!frames)) {
2065 runtime->twake = 0;
2066 snd_pcm_stream_unlock_irq(substream);
2067 return -EINVAL;
2068 }
2069 appl_ptr = runtime->control->appl_ptr;
2070 appl_ofs = appl_ptr % runtime->buffer_size;
2071 snd_pcm_stream_unlock_irq(substream);
2072 err = transfer(substream, appl_ofs, data, offset, frames);
2073 snd_pcm_stream_lock_irq(substream);
2074 if (err < 0)
2075 goto _end_unlock;
2076 switch (runtime->status->state) {
2077 case SNDRV_PCM_STATE_XRUN:
2078 err = -EPIPE;
2079 goto _end_unlock;
2080 case SNDRV_PCM_STATE_SUSPENDED:
2081 err = -ESTRPIPE;
2082 goto _end_unlock;
2083 default:
2084 break;
2085 }
2086 appl_ptr += frames;
2087 if (appl_ptr >= runtime->boundary)
2088 appl_ptr -= runtime->boundary;
2089 runtime->control->appl_ptr = appl_ptr;
2090 if (substream->ops->ack)
2091 substream->ops->ack(substream);
2092
2093 offset += frames;
2094 size -= frames;
2095 xfer += frames;
2096 avail -= frames;
2097 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
2098 snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
2099 err = snd_pcm_start(substream);
2100 if (err < 0)
2101 goto _end_unlock;
2102 }
2103 }
2104 _end_unlock:
2105 runtime->twake = 0;
2106 if (xfer > 0 && err >= 0)
2107 snd_pcm_update_state(substream, runtime);
2108 snd_pcm_stream_unlock_irq(substream);
2109 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2110}
2111
2112/* sanity-check for read/write methods */
2113static int pcm_sanity_check(struct snd_pcm_substream *substream)
2114{
2115 struct snd_pcm_runtime *runtime;
2116 if (PCM_RUNTIME_CHECK(substream))
2117 return -ENXIO;
2118 runtime = substream->runtime;
2119 if (snd_BUG_ON(!substream->ops->copy && !runtime->dma_area))
2120 return -EINVAL;
2121 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2122 return -EBADFD;
2123 return 0;
2124}
2125
2126snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, const void __user *buf, snd_pcm_uframes_t size)
2127{
2128 struct snd_pcm_runtime *runtime;
2129 int nonblock;
2130 int err;
2131
2132 err = pcm_sanity_check(substream);
2133 if (err < 0)
2134 return err;
2135 runtime = substream->runtime;
2136 nonblock = !!(substream->f_flags & O_NONBLOCK);
2137
2138 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
2139 runtime->channels > 1)
2140 return -EINVAL;
2141 return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock,
2142 snd_pcm_lib_write_transfer);
2143}
2144
2145EXPORT_SYMBOL(snd_pcm_lib_write);
2146
2147static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream,
2148 unsigned int hwoff,
2149 unsigned long data, unsigned int off,
2150 snd_pcm_uframes_t frames)
2151{
2152 struct snd_pcm_runtime *runtime = substream->runtime;
2153 int err;
2154 void __user **bufs = (void __user **)data;
2155 int channels = runtime->channels;
2156 int c;
2157 if (substream->ops->copy) {
2158 if (snd_BUG_ON(!substream->ops->silence))
2159 return -EINVAL;
2160 for (c = 0; c < channels; ++c, ++bufs) {
2161 if (*bufs == NULL) {
2162 if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0)
2163 return err;
2164 } else {
2165 char __user *buf = *bufs + samples_to_bytes(runtime, off);
2166 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2167 return err;
2168 }
2169 }
2170 } else {
2171 /* default transfer behaviour */
2172 size_t dma_csize = runtime->dma_bytes / channels;
2173 for (c = 0; c < channels; ++c, ++bufs) {
2174 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2175 if (*bufs == NULL) {
2176 snd_pcm_format_set_silence(runtime->format, hwbuf, frames);
2177 } else {
2178 char __user *buf = *bufs + samples_to_bytes(runtime, off);
2179 if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames)))
2180 return -EFAULT;
2181 }
2182 }
2183 }
2184 return 0;
2185}
2186
2187snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
2188 void __user **bufs,
2189 snd_pcm_uframes_t frames)
2190{
2191 struct snd_pcm_runtime *runtime;
2192 int nonblock;
2193 int err;
2194
2195 err = pcm_sanity_check(substream);
2196 if (err < 0)
2197 return err;
2198 runtime = substream->runtime;
2199 nonblock = !!(substream->f_flags & O_NONBLOCK);
2200
2201 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2202 return -EINVAL;
2203 return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames,
2204 nonblock, snd_pcm_lib_writev_transfer);
2205}
2206
2207EXPORT_SYMBOL(snd_pcm_lib_writev);
2208
2209static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream,
2210 unsigned int hwoff,
2211 unsigned long data, unsigned int off,
2212 snd_pcm_uframes_t frames)
2213{
2214 struct snd_pcm_runtime *runtime = substream->runtime;
2215 int err;
2216 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
2217 if (substream->ops->copy) {
2218 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
2219 return err;
2220 } else {
2221 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
2222 if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
2223 return -EFAULT;
2224 }
2225 return 0;
2226}
2227
2228static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
2229 unsigned long data,
2230 snd_pcm_uframes_t size,
2231 int nonblock,
2232 transfer_f transfer)
2233{
2234 struct snd_pcm_runtime *runtime = substream->runtime;
2235 snd_pcm_uframes_t xfer = 0;
2236 snd_pcm_uframes_t offset = 0;
2237 snd_pcm_uframes_t avail;
2238 int err = 0;
2239
2240 if (size == 0)
2241 return 0;
2242
2243 snd_pcm_stream_lock_irq(substream);
2244 switch (runtime->status->state) {
2245 case SNDRV_PCM_STATE_PREPARED:
2246 if (size >= runtime->start_threshold) {
2247 err = snd_pcm_start(substream);
2248 if (err < 0)
2249 goto _end_unlock;
2250 }
2251 break;
2252 case SNDRV_PCM_STATE_DRAINING:
2253 case SNDRV_PCM_STATE_RUNNING:
2254 case SNDRV_PCM_STATE_PAUSED:
2255 break;
2256 case SNDRV_PCM_STATE_XRUN:
2257 err = -EPIPE;
2258 goto _end_unlock;
2259 case SNDRV_PCM_STATE_SUSPENDED:
2260 err = -ESTRPIPE;
2261 goto _end_unlock;
2262 default:
2263 err = -EBADFD;
2264 goto _end_unlock;
2265 }
2266
2267 runtime->twake = runtime->control->avail_min ? : 1;
2268 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2269 snd_pcm_update_hw_ptr(substream);
2270 avail = snd_pcm_capture_avail(runtime);
2271 while (size > 0) {
2272 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2273 snd_pcm_uframes_t cont;
2274 if (!avail) {
2275 if (runtime->status->state ==
2276 SNDRV_PCM_STATE_DRAINING) {
2277 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2278 goto _end_unlock;
2279 }
2280 if (nonblock) {
2281 err = -EAGAIN;
2282 goto _end_unlock;
2283 }
2284 runtime->twake = min_t(snd_pcm_uframes_t, size,
2285 runtime->control->avail_min ? : 1);
2286 err = wait_for_avail(substream, &avail);
2287 if (err < 0)
2288 goto _end_unlock;
2289 if (!avail)
2290 continue; /* draining */
2291 }
2292 frames = size > avail ? avail : size;
2293 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2294 if (frames > cont)
2295 frames = cont;
2296 if (snd_BUG_ON(!frames)) {
2297 runtime->twake = 0;
2298 snd_pcm_stream_unlock_irq(substream);
2299 return -EINVAL;
2300 }
2301 appl_ptr = runtime->control->appl_ptr;
2302 appl_ofs = appl_ptr % runtime->buffer_size;
2303 snd_pcm_stream_unlock_irq(substream);
2304 err = transfer(substream, appl_ofs, data, offset, frames);
2305 snd_pcm_stream_lock_irq(substream);
2306 if (err < 0)
2307 goto _end_unlock;
2308 switch (runtime->status->state) {
2309 case SNDRV_PCM_STATE_XRUN:
2310 err = -EPIPE;
2311 goto _end_unlock;
2312 case SNDRV_PCM_STATE_SUSPENDED:
2313 err = -ESTRPIPE;
2314 goto _end_unlock;
2315 default:
2316 break;
2317 }
2318 appl_ptr += frames;
2319 if (appl_ptr >= runtime->boundary)
2320 appl_ptr -= runtime->boundary;
2321 runtime->control->appl_ptr = appl_ptr;
2322 if (substream->ops->ack)
2323 substream->ops->ack(substream);
2324
2325 offset += frames;
2326 size -= frames;
2327 xfer += frames;
2328 avail -= frames;
2329 }
2330 _end_unlock:
2331 runtime->twake = 0;
2332 if (xfer > 0 && err >= 0)
2333 snd_pcm_update_state(substream, runtime);
2334 snd_pcm_stream_unlock_irq(substream);
2335 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2336}
2337
2338snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, void __user *buf, snd_pcm_uframes_t size)
2339{
2340 struct snd_pcm_runtime *runtime;
2341 int nonblock;
2342 int err;
2343
2344 err = pcm_sanity_check(substream);
2345 if (err < 0)
2346 return err;
2347 runtime = substream->runtime;
2348 nonblock = !!(substream->f_flags & O_NONBLOCK);
2349 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED)
2350 return -EINVAL;
2351 return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer);
2352}
2353
2354EXPORT_SYMBOL(snd_pcm_lib_read);
2355
2356static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream,
2357 unsigned int hwoff,
2358 unsigned long data, unsigned int off,
2359 snd_pcm_uframes_t frames)
2360{
2361 struct snd_pcm_runtime *runtime = substream->runtime;
2362 int err;
2363 void __user **bufs = (void __user **)data;
2364 int channels = runtime->channels;
2365 int c;
2366 if (substream->ops->copy) {
2367 for (c = 0; c < channels; ++c, ++bufs) {
2368 char __user *buf;
2369 if (*bufs == NULL)
2370 continue;
2371 buf = *bufs + samples_to_bytes(runtime, off);
2372 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2373 return err;
2374 }
2375 } else {
2376 snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
2377 for (c = 0; c < channels; ++c, ++bufs) {
2378 char *hwbuf;
2379 char __user *buf;
2380 if (*bufs == NULL)
2381 continue;
2382
2383 hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2384 buf = *bufs + samples_to_bytes(runtime, off);
2385 if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
2386 return -EFAULT;
2387 }
2388 }
2389 return 0;
2390}
2391
2392snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
2393 void __user **bufs,
2394 snd_pcm_uframes_t frames)
2395{
2396 struct snd_pcm_runtime *runtime;
2397 int nonblock;
2398 int err;
2399
2400 err = pcm_sanity_check(substream);
2401 if (err < 0)
2402 return err;
2403 runtime = substream->runtime;
2404 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2405 return -EBADFD;
2406
2407 nonblock = !!(substream->f_flags & O_NONBLOCK);
2408 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2409 return -EINVAL;
2410 return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer);
2411}
2412
2413EXPORT_SYMBOL(snd_pcm_lib_readv);
2414
2415/*
2416 * standard channel mapping helpers
2417 */
2418
2419/* default channel maps for multi-channel playbacks, up to 8 channels */
2420const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[] = {
2421 { .channels = 1,
2422 .map = { SNDRV_CHMAP_MONO } },
2423 { .channels = 2,
2424 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
2425 { .channels = 4,
2426 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2427 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2428 { .channels = 6,
2429 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2430 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2431 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE } },
2432 { .channels = 8,
2433 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2434 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2435 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2436 SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
2437 { }
2438};
2439EXPORT_SYMBOL_GPL(snd_pcm_std_chmaps);
2440
2441/* alternative channel maps with CLFE <-> surround swapped for 6/8 channels */
2442const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[] = {
2443 { .channels = 1,
2444 .map = { SNDRV_CHMAP_MONO } },
2445 { .channels = 2,
2446 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
2447 { .channels = 4,
2448 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2449 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2450 { .channels = 6,
2451 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2452 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2453 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2454 { .channels = 8,
2455 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2456 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2457 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2458 SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
2459 { }
2460};
2461EXPORT_SYMBOL_GPL(snd_pcm_alt_chmaps);
2462
2463static bool valid_chmap_channels(const struct snd_pcm_chmap *info, int ch)
2464{
2465 if (ch > info->max_channels)
2466 return false;
2467 return !info->channel_mask || (info->channel_mask & (1U << ch));
2468}
2469
2470static int pcm_chmap_ctl_info(struct snd_kcontrol *kcontrol,
2471 struct snd_ctl_elem_info *uinfo)
2472{
2473 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2474
2475 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
2476 uinfo->count = 0;
2477 uinfo->count = info->max_channels;
2478 uinfo->value.integer.min = 0;
2479 uinfo->value.integer.max = SNDRV_CHMAP_LAST;
2480 return 0;
2481}
2482
2483/* get callback for channel map ctl element
2484 * stores the channel position firstly matching with the current channels
2485 */
2486static int pcm_chmap_ctl_get(struct snd_kcontrol *kcontrol,
2487 struct snd_ctl_elem_value *ucontrol)
2488{
2489 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2490 unsigned int idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);
2491 struct snd_pcm_substream *substream;
2492 const struct snd_pcm_chmap_elem *map;
2493
2494 if (snd_BUG_ON(!info->chmap))
2495 return -EINVAL;
2496 substream = snd_pcm_chmap_substream(info, idx);
2497 if (!substream)
2498 return -ENODEV;
2499 memset(ucontrol->value.integer.value, 0,
2500 sizeof(ucontrol->value.integer.value));
2501 if (!substream->runtime)
2502 return 0; /* no channels set */
2503 for (map = info->chmap; map->channels; map++) {
2504 int i;
2505 if (map->channels == substream->runtime->channels &&
2506 valid_chmap_channels(info, map->channels)) {
2507 for (i = 0; i < map->channels; i++)
2508 ucontrol->value.integer.value[i] = map->map[i];
2509 return 0;
2510 }
2511 }
2512 return -EINVAL;
2513}
2514
2515/* tlv callback for channel map ctl element
2516 * expands the pre-defined channel maps in a form of TLV
2517 */
2518static int pcm_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
2519 unsigned int size, unsigned int __user *tlv)
2520{
2521 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2522 const struct snd_pcm_chmap_elem *map;
2523 unsigned int __user *dst;
2524 int c, count = 0;
2525
2526 if (snd_BUG_ON(!info->chmap))
2527 return -EINVAL;
2528 if (size < 8)
2529 return -ENOMEM;
2530 if (put_user(SNDRV_CTL_TLVT_CONTAINER, tlv))
2531 return -EFAULT;
2532 size -= 8;
2533 dst = tlv + 2;
2534 for (map = info->chmap; map->channels; map++) {
2535 int chs_bytes = map->channels * 4;
2536 if (!valid_chmap_channels(info, map->channels))
2537 continue;
2538 if (size < 8)
2539 return -ENOMEM;
2540 if (put_user(SNDRV_CTL_TLVT_CHMAP_FIXED, dst) ||
2541 put_user(chs_bytes, dst + 1))
2542 return -EFAULT;
2543 dst += 2;
2544 size -= 8;
2545 count += 8;
2546 if (size < chs_bytes)
2547 return -ENOMEM;
2548 size -= chs_bytes;
2549 count += chs_bytes;
2550 for (c = 0; c < map->channels; c++) {
2551 if (put_user(map->map[c], dst))
2552 return -EFAULT;
2553 dst++;
2554 }
2555 }
2556 if (put_user(count, tlv + 1))
2557 return -EFAULT;
2558 return 0;
2559}
2560
2561static void pcm_chmap_ctl_private_free(struct snd_kcontrol *kcontrol)
2562{
2563 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2564 info->pcm->streams[info->stream].chmap_kctl = NULL;
2565 kfree(info);
2566}
2567
2568/**
2569 * snd_pcm_add_chmap_ctls - create channel-mapping control elements
2570 * @pcm: the assigned PCM instance
2571 * @stream: stream direction
2572 * @chmap: channel map elements (for query)
2573 * @max_channels: the max number of channels for the stream
2574 * @private_value: the value passed to each kcontrol's private_value field
2575 * @info_ret: store struct snd_pcm_chmap instance if non-NULL
2576 *
2577 * Create channel-mapping control elements assigned to the given PCM stream(s).
2578 * Return: Zero if successful, or a negative error value.
2579 */
2580int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
2581 const struct snd_pcm_chmap_elem *chmap,
2582 int max_channels,
2583 unsigned long private_value,
2584 struct snd_pcm_chmap **info_ret)
2585{
2586 struct snd_pcm_chmap *info;
2587 struct snd_kcontrol_new knew = {
2588 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
2589 .access = SNDRV_CTL_ELEM_ACCESS_READ |
2590 SNDRV_CTL_ELEM_ACCESS_TLV_READ |
2591 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK,
2592 .info = pcm_chmap_ctl_info,
2593 .get = pcm_chmap_ctl_get,
2594 .tlv.c = pcm_chmap_ctl_tlv,
2595 };
2596 int err;
2597
2598 if (WARN_ON(pcm->streams[stream].chmap_kctl))
2599 return -EBUSY;
2600 info = kzalloc(sizeof(*info), GFP_KERNEL);
2601 if (!info)
2602 return -ENOMEM;
2603 info->pcm = pcm;
2604 info->stream = stream;
2605 info->chmap = chmap;
2606 info->max_channels = max_channels;
2607 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
2608 knew.name = "Playback Channel Map";
2609 else
2610 knew.name = "Capture Channel Map";
2611 knew.device = pcm->device;
2612 knew.count = pcm->streams[stream].substream_count;
2613 knew.private_value = private_value;
2614 info->kctl = snd_ctl_new1(&knew, info);
2615 if (!info->kctl) {
2616 kfree(info);
2617 return -ENOMEM;
2618 }
2619 info->kctl->private_free = pcm_chmap_ctl_private_free;
2620 err = snd_ctl_add(pcm->card, info->kctl);
2621 if (err < 0)
2622 return err;
2623 pcm->streams[stream].chmap_kctl = info->kctl;
2624 if (info_ret)
2625 *info_ret = info;
2626 return 0;
2627}
2628EXPORT_SYMBOL_GPL(snd_pcm_add_chmap_ctls);
1/*
2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 * Abramo Bagnara <abramo@alsa-project.org>
5 *
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 */
22
23#include <linux/slab.h>
24#include <linux/sched/signal.h>
25#include <linux/time.h>
26#include <linux/math64.h>
27#include <linux/export.h>
28#include <sound/core.h>
29#include <sound/control.h>
30#include <sound/tlv.h>
31#include <sound/info.h>
32#include <sound/pcm.h>
33#include <sound/pcm_params.h>
34#include <sound/timer.h>
35
36#include "pcm_local.h"
37
38#ifdef CONFIG_SND_PCM_XRUN_DEBUG
39#define CREATE_TRACE_POINTS
40#include "pcm_trace.h"
41#else
42#define trace_hwptr(substream, pos, in_interrupt)
43#define trace_xrun(substream)
44#define trace_hw_ptr_error(substream, reason)
45#define trace_applptr(substream, prev, curr)
46#endif
47
48static int fill_silence_frames(struct snd_pcm_substream *substream,
49 snd_pcm_uframes_t off, snd_pcm_uframes_t frames);
50
51/*
52 * fill ring buffer with silence
53 * runtime->silence_start: starting pointer to silence area
54 * runtime->silence_filled: size filled with silence
55 * runtime->silence_threshold: threshold from application
56 * runtime->silence_size: maximal size from application
57 *
58 * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately
59 */
60void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr)
61{
62 struct snd_pcm_runtime *runtime = substream->runtime;
63 snd_pcm_uframes_t frames, ofs, transfer;
64 int err;
65
66 if (runtime->silence_size < runtime->boundary) {
67 snd_pcm_sframes_t noise_dist, n;
68 snd_pcm_uframes_t appl_ptr = READ_ONCE(runtime->control->appl_ptr);
69 if (runtime->silence_start != appl_ptr) {
70 n = appl_ptr - runtime->silence_start;
71 if (n < 0)
72 n += runtime->boundary;
73 if ((snd_pcm_uframes_t)n < runtime->silence_filled)
74 runtime->silence_filled -= n;
75 else
76 runtime->silence_filled = 0;
77 runtime->silence_start = appl_ptr;
78 }
79 if (runtime->silence_filled >= runtime->buffer_size)
80 return;
81 noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
82 if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold)
83 return;
84 frames = runtime->silence_threshold - noise_dist;
85 if (frames > runtime->silence_size)
86 frames = runtime->silence_size;
87 } else {
88 if (new_hw_ptr == ULONG_MAX) { /* initialization */
89 snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime);
90 if (avail > runtime->buffer_size)
91 avail = runtime->buffer_size;
92 runtime->silence_filled = avail > 0 ? avail : 0;
93 runtime->silence_start = (runtime->status->hw_ptr +
94 runtime->silence_filled) %
95 runtime->boundary;
96 } else {
97 ofs = runtime->status->hw_ptr;
98 frames = new_hw_ptr - ofs;
99 if ((snd_pcm_sframes_t)frames < 0)
100 frames += runtime->boundary;
101 runtime->silence_filled -= frames;
102 if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
103 runtime->silence_filled = 0;
104 runtime->silence_start = new_hw_ptr;
105 } else {
106 runtime->silence_start = ofs;
107 }
108 }
109 frames = runtime->buffer_size - runtime->silence_filled;
110 }
111 if (snd_BUG_ON(frames > runtime->buffer_size))
112 return;
113 if (frames == 0)
114 return;
115 ofs = runtime->silence_start % runtime->buffer_size;
116 while (frames > 0) {
117 transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
118 err = fill_silence_frames(substream, ofs, transfer);
119 snd_BUG_ON(err < 0);
120 runtime->silence_filled += transfer;
121 frames -= transfer;
122 ofs = 0;
123 }
124}
125
126#ifdef CONFIG_SND_DEBUG
127void snd_pcm_debug_name(struct snd_pcm_substream *substream,
128 char *name, size_t len)
129{
130 snprintf(name, len, "pcmC%dD%d%c:%d",
131 substream->pcm->card->number,
132 substream->pcm->device,
133 substream->stream ? 'c' : 'p',
134 substream->number);
135}
136EXPORT_SYMBOL(snd_pcm_debug_name);
137#endif
138
139#define XRUN_DEBUG_BASIC (1<<0)
140#define XRUN_DEBUG_STACK (1<<1) /* dump also stack */
141#define XRUN_DEBUG_JIFFIESCHECK (1<<2) /* do jiffies check */
142
143#ifdef CONFIG_SND_PCM_XRUN_DEBUG
144
145#define xrun_debug(substream, mask) \
146 ((substream)->pstr->xrun_debug & (mask))
147#else
148#define xrun_debug(substream, mask) 0
149#endif
150
151#define dump_stack_on_xrun(substream) do { \
152 if (xrun_debug(substream, XRUN_DEBUG_STACK)) \
153 dump_stack(); \
154 } while (0)
155
156static void xrun(struct snd_pcm_substream *substream)
157{
158 struct snd_pcm_runtime *runtime = substream->runtime;
159
160 trace_xrun(substream);
161 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
162 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
163 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
164 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {
165 char name[16];
166 snd_pcm_debug_name(substream, name, sizeof(name));
167 pcm_warn(substream->pcm, "XRUN: %s\n", name);
168 dump_stack_on_xrun(substream);
169 }
170}
171
172#ifdef CONFIG_SND_PCM_XRUN_DEBUG
173#define hw_ptr_error(substream, in_interrupt, reason, fmt, args...) \
174 do { \
175 trace_hw_ptr_error(substream, reason); \
176 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { \
177 pr_err_ratelimited("ALSA: PCM: [%c] " reason ": " fmt, \
178 (in_interrupt) ? 'Q' : 'P', ##args); \
179 dump_stack_on_xrun(substream); \
180 } \
181 } while (0)
182
183#else /* ! CONFIG_SND_PCM_XRUN_DEBUG */
184
185#define hw_ptr_error(substream, fmt, args...) do { } while (0)
186
187#endif
188
189int snd_pcm_update_state(struct snd_pcm_substream *substream,
190 struct snd_pcm_runtime *runtime)
191{
192 snd_pcm_uframes_t avail;
193
194 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
195 avail = snd_pcm_playback_avail(runtime);
196 else
197 avail = snd_pcm_capture_avail(runtime);
198 if (avail > runtime->avail_max)
199 runtime->avail_max = avail;
200 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
201 if (avail >= runtime->buffer_size) {
202 snd_pcm_drain_done(substream);
203 return -EPIPE;
204 }
205 } else {
206 if (avail >= runtime->stop_threshold) {
207 xrun(substream);
208 return -EPIPE;
209 }
210 }
211 if (runtime->twake) {
212 if (avail >= runtime->twake)
213 wake_up(&runtime->tsleep);
214 } else if (avail >= runtime->control->avail_min)
215 wake_up(&runtime->sleep);
216 return 0;
217}
218
219static void update_audio_tstamp(struct snd_pcm_substream *substream,
220 struct timespec *curr_tstamp,
221 struct timespec *audio_tstamp)
222{
223 struct snd_pcm_runtime *runtime = substream->runtime;
224 u64 audio_frames, audio_nsecs;
225 struct timespec driver_tstamp;
226
227 if (runtime->tstamp_mode != SNDRV_PCM_TSTAMP_ENABLE)
228 return;
229
230 if (!(substream->ops->get_time_info) ||
231 (runtime->audio_tstamp_report.actual_type ==
232 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)) {
233
234 /*
235 * provide audio timestamp derived from pointer position
236 * add delay only if requested
237 */
238
239 audio_frames = runtime->hw_ptr_wrap + runtime->status->hw_ptr;
240
241 if (runtime->audio_tstamp_config.report_delay) {
242 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
243 audio_frames -= runtime->delay;
244 else
245 audio_frames += runtime->delay;
246 }
247 audio_nsecs = div_u64(audio_frames * 1000000000LL,
248 runtime->rate);
249 *audio_tstamp = ns_to_timespec(audio_nsecs);
250 }
251 if (!timespec_equal(&runtime->status->audio_tstamp, audio_tstamp)) {
252 runtime->status->audio_tstamp = *audio_tstamp;
253 runtime->status->tstamp = *curr_tstamp;
254 }
255
256 /*
257 * re-take a driver timestamp to let apps detect if the reference tstamp
258 * read by low-level hardware was provided with a delay
259 */
260 snd_pcm_gettime(substream->runtime, (struct timespec *)&driver_tstamp);
261 runtime->driver_tstamp = driver_tstamp;
262}
263
264static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
265 unsigned int in_interrupt)
266{
267 struct snd_pcm_runtime *runtime = substream->runtime;
268 snd_pcm_uframes_t pos;
269 snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
270 snd_pcm_sframes_t hdelta, delta;
271 unsigned long jdelta;
272 unsigned long curr_jiffies;
273 struct timespec curr_tstamp;
274 struct timespec audio_tstamp;
275 int crossed_boundary = 0;
276
277 old_hw_ptr = runtime->status->hw_ptr;
278
279 /*
280 * group pointer, time and jiffies reads to allow for more
281 * accurate correlations/corrections.
282 * The values are stored at the end of this routine after
283 * corrections for hw_ptr position
284 */
285 pos = substream->ops->pointer(substream);
286 curr_jiffies = jiffies;
287 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
288 if ((substream->ops->get_time_info) &&
289 (runtime->audio_tstamp_config.type_requested != SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)) {
290 substream->ops->get_time_info(substream, &curr_tstamp,
291 &audio_tstamp,
292 &runtime->audio_tstamp_config,
293 &runtime->audio_tstamp_report);
294
295 /* re-test in case tstamp type is not supported in hardware and was demoted to DEFAULT */
296 if (runtime->audio_tstamp_report.actual_type == SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)
297 snd_pcm_gettime(runtime, (struct timespec *)&curr_tstamp);
298 } else
299 snd_pcm_gettime(runtime, (struct timespec *)&curr_tstamp);
300 }
301
302 if (pos == SNDRV_PCM_POS_XRUN) {
303 xrun(substream);
304 return -EPIPE;
305 }
306 if (pos >= runtime->buffer_size) {
307 if (printk_ratelimit()) {
308 char name[16];
309 snd_pcm_debug_name(substream, name, sizeof(name));
310 pcm_err(substream->pcm,
311 "invalid position: %s, pos = %ld, buffer size = %ld, period size = %ld\n",
312 name, pos, runtime->buffer_size,
313 runtime->period_size);
314 }
315 pos = 0;
316 }
317 pos -= pos % runtime->min_align;
318 trace_hwptr(substream, pos, in_interrupt);
319 hw_base = runtime->hw_ptr_base;
320 new_hw_ptr = hw_base + pos;
321 if (in_interrupt) {
322 /* we know that one period was processed */
323 /* delta = "expected next hw_ptr" for in_interrupt != 0 */
324 delta = runtime->hw_ptr_interrupt + runtime->period_size;
325 if (delta > new_hw_ptr) {
326 /* check for double acknowledged interrupts */
327 hdelta = curr_jiffies - runtime->hw_ptr_jiffies;
328 if (hdelta > runtime->hw_ptr_buffer_jiffies/2 + 1) {
329 hw_base += runtime->buffer_size;
330 if (hw_base >= runtime->boundary) {
331 hw_base = 0;
332 crossed_boundary++;
333 }
334 new_hw_ptr = hw_base + pos;
335 goto __delta;
336 }
337 }
338 }
339 /* new_hw_ptr might be lower than old_hw_ptr in case when */
340 /* pointer crosses the end of the ring buffer */
341 if (new_hw_ptr < old_hw_ptr) {
342 hw_base += runtime->buffer_size;
343 if (hw_base >= runtime->boundary) {
344 hw_base = 0;
345 crossed_boundary++;
346 }
347 new_hw_ptr = hw_base + pos;
348 }
349 __delta:
350 delta = new_hw_ptr - old_hw_ptr;
351 if (delta < 0)
352 delta += runtime->boundary;
353
354 if (runtime->no_period_wakeup) {
355 snd_pcm_sframes_t xrun_threshold;
356 /*
357 * Without regular period interrupts, we have to check
358 * the elapsed time to detect xruns.
359 */
360 jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
361 if (jdelta < runtime->hw_ptr_buffer_jiffies / 2)
362 goto no_delta_check;
363 hdelta = jdelta - delta * HZ / runtime->rate;
364 xrun_threshold = runtime->hw_ptr_buffer_jiffies / 2 + 1;
365 while (hdelta > xrun_threshold) {
366 delta += runtime->buffer_size;
367 hw_base += runtime->buffer_size;
368 if (hw_base >= runtime->boundary) {
369 hw_base = 0;
370 crossed_boundary++;
371 }
372 new_hw_ptr = hw_base + pos;
373 hdelta -= runtime->hw_ptr_buffer_jiffies;
374 }
375 goto no_delta_check;
376 }
377
378 /* something must be really wrong */
379 if (delta >= runtime->buffer_size + runtime->period_size) {
380 hw_ptr_error(substream, in_interrupt, "Unexpected hw_ptr",
381 "(stream=%i, pos=%ld, new_hw_ptr=%ld, old_hw_ptr=%ld)\n",
382 substream->stream, (long)pos,
383 (long)new_hw_ptr, (long)old_hw_ptr);
384 return 0;
385 }
386
387 /* Do jiffies check only in xrun_debug mode */
388 if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
389 goto no_jiffies_check;
390
391 /* Skip the jiffies check for hardwares with BATCH flag.
392 * Such hardware usually just increases the position at each IRQ,
393 * thus it can't give any strange position.
394 */
395 if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
396 goto no_jiffies_check;
397 hdelta = delta;
398 if (hdelta < runtime->delay)
399 goto no_jiffies_check;
400 hdelta -= runtime->delay;
401 jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
402 if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
403 delta = jdelta /
404 (((runtime->period_size * HZ) / runtime->rate)
405 + HZ/100);
406 /* move new_hw_ptr according jiffies not pos variable */
407 new_hw_ptr = old_hw_ptr;
408 hw_base = delta;
409 /* use loop to avoid checks for delta overflows */
410 /* the delta value is small or zero in most cases */
411 while (delta > 0) {
412 new_hw_ptr += runtime->period_size;
413 if (new_hw_ptr >= runtime->boundary) {
414 new_hw_ptr -= runtime->boundary;
415 crossed_boundary--;
416 }
417 delta--;
418 }
419 /* align hw_base to buffer_size */
420 hw_ptr_error(substream, in_interrupt, "hw_ptr skipping",
421 "(pos=%ld, delta=%ld, period=%ld, jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
422 (long)pos, (long)hdelta,
423 (long)runtime->period_size, jdelta,
424 ((hdelta * HZ) / runtime->rate), hw_base,
425 (unsigned long)old_hw_ptr,
426 (unsigned long)new_hw_ptr);
427 /* reset values to proper state */
428 delta = 0;
429 hw_base = new_hw_ptr - (new_hw_ptr % runtime->buffer_size);
430 }
431 no_jiffies_check:
432 if (delta > runtime->period_size + runtime->period_size / 2) {
433 hw_ptr_error(substream, in_interrupt,
434 "Lost interrupts?",
435 "(stream=%i, delta=%ld, new_hw_ptr=%ld, old_hw_ptr=%ld)\n",
436 substream->stream, (long)delta,
437 (long)new_hw_ptr,
438 (long)old_hw_ptr);
439 }
440
441 no_delta_check:
442 if (runtime->status->hw_ptr == new_hw_ptr) {
443 update_audio_tstamp(substream, &curr_tstamp, &audio_tstamp);
444 return 0;
445 }
446
447 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
448 runtime->silence_size > 0)
449 snd_pcm_playback_silence(substream, new_hw_ptr);
450
451 if (in_interrupt) {
452 delta = new_hw_ptr - runtime->hw_ptr_interrupt;
453 if (delta < 0)
454 delta += runtime->boundary;
455 delta -= (snd_pcm_uframes_t)delta % runtime->period_size;
456 runtime->hw_ptr_interrupt += delta;
457 if (runtime->hw_ptr_interrupt >= runtime->boundary)
458 runtime->hw_ptr_interrupt -= runtime->boundary;
459 }
460 runtime->hw_ptr_base = hw_base;
461 runtime->status->hw_ptr = new_hw_ptr;
462 runtime->hw_ptr_jiffies = curr_jiffies;
463 if (crossed_boundary) {
464 snd_BUG_ON(crossed_boundary != 1);
465 runtime->hw_ptr_wrap += runtime->boundary;
466 }
467
468 update_audio_tstamp(substream, &curr_tstamp, &audio_tstamp);
469
470 return snd_pcm_update_state(substream, runtime);
471}
472
473/* CAUTION: call it with irq disabled */
474int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
475{
476 return snd_pcm_update_hw_ptr0(substream, 0);
477}
478
479/**
480 * snd_pcm_set_ops - set the PCM operators
481 * @pcm: the pcm instance
482 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
483 * @ops: the operator table
484 *
485 * Sets the given PCM operators to the pcm instance.
486 */
487void snd_pcm_set_ops(struct snd_pcm *pcm, int direction,
488 const struct snd_pcm_ops *ops)
489{
490 struct snd_pcm_str *stream = &pcm->streams[direction];
491 struct snd_pcm_substream *substream;
492
493 for (substream = stream->substream; substream != NULL; substream = substream->next)
494 substream->ops = ops;
495}
496EXPORT_SYMBOL(snd_pcm_set_ops);
497
498/**
499 * snd_pcm_sync - set the PCM sync id
500 * @substream: the pcm substream
501 *
502 * Sets the PCM sync identifier for the card.
503 */
504void snd_pcm_set_sync(struct snd_pcm_substream *substream)
505{
506 struct snd_pcm_runtime *runtime = substream->runtime;
507
508 runtime->sync.id32[0] = substream->pcm->card->number;
509 runtime->sync.id32[1] = -1;
510 runtime->sync.id32[2] = -1;
511 runtime->sync.id32[3] = -1;
512}
513EXPORT_SYMBOL(snd_pcm_set_sync);
514
515/*
516 * Standard ioctl routine
517 */
518
519static inline unsigned int div32(unsigned int a, unsigned int b,
520 unsigned int *r)
521{
522 if (b == 0) {
523 *r = 0;
524 return UINT_MAX;
525 }
526 *r = a % b;
527 return a / b;
528}
529
530static inline unsigned int div_down(unsigned int a, unsigned int b)
531{
532 if (b == 0)
533 return UINT_MAX;
534 return a / b;
535}
536
537static inline unsigned int div_up(unsigned int a, unsigned int b)
538{
539 unsigned int r;
540 unsigned int q;
541 if (b == 0)
542 return UINT_MAX;
543 q = div32(a, b, &r);
544 if (r)
545 ++q;
546 return q;
547}
548
549static inline unsigned int mul(unsigned int a, unsigned int b)
550{
551 if (a == 0)
552 return 0;
553 if (div_down(UINT_MAX, a) < b)
554 return UINT_MAX;
555 return a * b;
556}
557
558static inline unsigned int muldiv32(unsigned int a, unsigned int b,
559 unsigned int c, unsigned int *r)
560{
561 u_int64_t n = (u_int64_t) a * b;
562 if (c == 0) {
563 *r = 0;
564 return UINT_MAX;
565 }
566 n = div_u64_rem(n, c, r);
567 if (n >= UINT_MAX) {
568 *r = 0;
569 return UINT_MAX;
570 }
571 return n;
572}
573
574/**
575 * snd_interval_refine - refine the interval value of configurator
576 * @i: the interval value to refine
577 * @v: the interval value to refer to
578 *
579 * Refines the interval value with the reference value.
580 * The interval is changed to the range satisfying both intervals.
581 * The interval status (min, max, integer, etc.) are evaluated.
582 *
583 * Return: Positive if the value is changed, zero if it's not changed, or a
584 * negative error code.
585 */
586int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
587{
588 int changed = 0;
589 if (snd_BUG_ON(snd_interval_empty(i)))
590 return -EINVAL;
591 if (i->min < v->min) {
592 i->min = v->min;
593 i->openmin = v->openmin;
594 changed = 1;
595 } else if (i->min == v->min && !i->openmin && v->openmin) {
596 i->openmin = 1;
597 changed = 1;
598 }
599 if (i->max > v->max) {
600 i->max = v->max;
601 i->openmax = v->openmax;
602 changed = 1;
603 } else if (i->max == v->max && !i->openmax && v->openmax) {
604 i->openmax = 1;
605 changed = 1;
606 }
607 if (!i->integer && v->integer) {
608 i->integer = 1;
609 changed = 1;
610 }
611 if (i->integer) {
612 if (i->openmin) {
613 i->min++;
614 i->openmin = 0;
615 }
616 if (i->openmax) {
617 i->max--;
618 i->openmax = 0;
619 }
620 } else if (!i->openmin && !i->openmax && i->min == i->max)
621 i->integer = 1;
622 if (snd_interval_checkempty(i)) {
623 snd_interval_none(i);
624 return -EINVAL;
625 }
626 return changed;
627}
628EXPORT_SYMBOL(snd_interval_refine);
629
630static int snd_interval_refine_first(struct snd_interval *i)
631{
632 if (snd_BUG_ON(snd_interval_empty(i)))
633 return -EINVAL;
634 if (snd_interval_single(i))
635 return 0;
636 i->max = i->min;
637 i->openmax = i->openmin;
638 if (i->openmax)
639 i->max++;
640 return 1;
641}
642
643static int snd_interval_refine_last(struct snd_interval *i)
644{
645 if (snd_BUG_ON(snd_interval_empty(i)))
646 return -EINVAL;
647 if (snd_interval_single(i))
648 return 0;
649 i->min = i->max;
650 i->openmin = i->openmax;
651 if (i->openmin)
652 i->min--;
653 return 1;
654}
655
656void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
657{
658 if (a->empty || b->empty) {
659 snd_interval_none(c);
660 return;
661 }
662 c->empty = 0;
663 c->min = mul(a->min, b->min);
664 c->openmin = (a->openmin || b->openmin);
665 c->max = mul(a->max, b->max);
666 c->openmax = (a->openmax || b->openmax);
667 c->integer = (a->integer && b->integer);
668}
669
670/**
671 * snd_interval_div - refine the interval value with division
672 * @a: dividend
673 * @b: divisor
674 * @c: quotient
675 *
676 * c = a / b
677 *
678 * Returns non-zero if the value is changed, zero if not changed.
679 */
680void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
681{
682 unsigned int r;
683 if (a->empty || b->empty) {
684 snd_interval_none(c);
685 return;
686 }
687 c->empty = 0;
688 c->min = div32(a->min, b->max, &r);
689 c->openmin = (r || a->openmin || b->openmax);
690 if (b->min > 0) {
691 c->max = div32(a->max, b->min, &r);
692 if (r) {
693 c->max++;
694 c->openmax = 1;
695 } else
696 c->openmax = (a->openmax || b->openmin);
697 } else {
698 c->max = UINT_MAX;
699 c->openmax = 0;
700 }
701 c->integer = 0;
702}
703
704/**
705 * snd_interval_muldivk - refine the interval value
706 * @a: dividend 1
707 * @b: dividend 2
708 * @k: divisor (as integer)
709 * @c: result
710 *
711 * c = a * b / k
712 *
713 * Returns non-zero if the value is changed, zero if not changed.
714 */
715void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
716 unsigned int k, struct snd_interval *c)
717{
718 unsigned int r;
719 if (a->empty || b->empty) {
720 snd_interval_none(c);
721 return;
722 }
723 c->empty = 0;
724 c->min = muldiv32(a->min, b->min, k, &r);
725 c->openmin = (r || a->openmin || b->openmin);
726 c->max = muldiv32(a->max, b->max, k, &r);
727 if (r) {
728 c->max++;
729 c->openmax = 1;
730 } else
731 c->openmax = (a->openmax || b->openmax);
732 c->integer = 0;
733}
734
735/**
736 * snd_interval_mulkdiv - refine the interval value
737 * @a: dividend 1
738 * @k: dividend 2 (as integer)
739 * @b: divisor
740 * @c: result
741 *
742 * c = a * k / b
743 *
744 * Returns non-zero if the value is changed, zero if not changed.
745 */
746void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
747 const struct snd_interval *b, struct snd_interval *c)
748{
749 unsigned int r;
750 if (a->empty || b->empty) {
751 snd_interval_none(c);
752 return;
753 }
754 c->empty = 0;
755 c->min = muldiv32(a->min, k, b->max, &r);
756 c->openmin = (r || a->openmin || b->openmax);
757 if (b->min > 0) {
758 c->max = muldiv32(a->max, k, b->min, &r);
759 if (r) {
760 c->max++;
761 c->openmax = 1;
762 } else
763 c->openmax = (a->openmax || b->openmin);
764 } else {
765 c->max = UINT_MAX;
766 c->openmax = 0;
767 }
768 c->integer = 0;
769}
770
771/* ---- */
772
773
774/**
775 * snd_interval_ratnum - refine the interval value
776 * @i: interval to refine
777 * @rats_count: number of ratnum_t
778 * @rats: ratnum_t array
779 * @nump: pointer to store the resultant numerator
780 * @denp: pointer to store the resultant denominator
781 *
782 * Return: Positive if the value is changed, zero if it's not changed, or a
783 * negative error code.
784 */
785int snd_interval_ratnum(struct snd_interval *i,
786 unsigned int rats_count, const struct snd_ratnum *rats,
787 unsigned int *nump, unsigned int *denp)
788{
789 unsigned int best_num, best_den;
790 int best_diff;
791 unsigned int k;
792 struct snd_interval t;
793 int err;
794 unsigned int result_num, result_den;
795 int result_diff;
796
797 best_num = best_den = best_diff = 0;
798 for (k = 0; k < rats_count; ++k) {
799 unsigned int num = rats[k].num;
800 unsigned int den;
801 unsigned int q = i->min;
802 int diff;
803 if (q == 0)
804 q = 1;
805 den = div_up(num, q);
806 if (den < rats[k].den_min)
807 continue;
808 if (den > rats[k].den_max)
809 den = rats[k].den_max;
810 else {
811 unsigned int r;
812 r = (den - rats[k].den_min) % rats[k].den_step;
813 if (r != 0)
814 den -= r;
815 }
816 diff = num - q * den;
817 if (diff < 0)
818 diff = -diff;
819 if (best_num == 0 ||
820 diff * best_den < best_diff * den) {
821 best_diff = diff;
822 best_den = den;
823 best_num = num;
824 }
825 }
826 if (best_den == 0) {
827 i->empty = 1;
828 return -EINVAL;
829 }
830 t.min = div_down(best_num, best_den);
831 t.openmin = !!(best_num % best_den);
832
833 result_num = best_num;
834 result_diff = best_diff;
835 result_den = best_den;
836 best_num = best_den = best_diff = 0;
837 for (k = 0; k < rats_count; ++k) {
838 unsigned int num = rats[k].num;
839 unsigned int den;
840 unsigned int q = i->max;
841 int diff;
842 if (q == 0) {
843 i->empty = 1;
844 return -EINVAL;
845 }
846 den = div_down(num, q);
847 if (den > rats[k].den_max)
848 continue;
849 if (den < rats[k].den_min)
850 den = rats[k].den_min;
851 else {
852 unsigned int r;
853 r = (den - rats[k].den_min) % rats[k].den_step;
854 if (r != 0)
855 den += rats[k].den_step - r;
856 }
857 diff = q * den - num;
858 if (diff < 0)
859 diff = -diff;
860 if (best_num == 0 ||
861 diff * best_den < best_diff * den) {
862 best_diff = diff;
863 best_den = den;
864 best_num = num;
865 }
866 }
867 if (best_den == 0) {
868 i->empty = 1;
869 return -EINVAL;
870 }
871 t.max = div_up(best_num, best_den);
872 t.openmax = !!(best_num % best_den);
873 t.integer = 0;
874 err = snd_interval_refine(i, &t);
875 if (err < 0)
876 return err;
877
878 if (snd_interval_single(i)) {
879 if (best_diff * result_den < result_diff * best_den) {
880 result_num = best_num;
881 result_den = best_den;
882 }
883 if (nump)
884 *nump = result_num;
885 if (denp)
886 *denp = result_den;
887 }
888 return err;
889}
890EXPORT_SYMBOL(snd_interval_ratnum);
891
892/**
893 * snd_interval_ratden - refine the interval value
894 * @i: interval to refine
895 * @rats_count: number of struct ratden
896 * @rats: struct ratden array
897 * @nump: pointer to store the resultant numerator
898 * @denp: pointer to store the resultant denominator
899 *
900 * Return: Positive if the value is changed, zero if it's not changed, or a
901 * negative error code.
902 */
903static int snd_interval_ratden(struct snd_interval *i,
904 unsigned int rats_count,
905 const struct snd_ratden *rats,
906 unsigned int *nump, unsigned int *denp)
907{
908 unsigned int best_num, best_diff, best_den;
909 unsigned int k;
910 struct snd_interval t;
911 int err;
912
913 best_num = best_den = best_diff = 0;
914 for (k = 0; k < rats_count; ++k) {
915 unsigned int num;
916 unsigned int den = rats[k].den;
917 unsigned int q = i->min;
918 int diff;
919 num = mul(q, den);
920 if (num > rats[k].num_max)
921 continue;
922 if (num < rats[k].num_min)
923 num = rats[k].num_max;
924 else {
925 unsigned int r;
926 r = (num - rats[k].num_min) % rats[k].num_step;
927 if (r != 0)
928 num += rats[k].num_step - r;
929 }
930 diff = num - q * den;
931 if (best_num == 0 ||
932 diff * best_den < best_diff * den) {
933 best_diff = diff;
934 best_den = den;
935 best_num = num;
936 }
937 }
938 if (best_den == 0) {
939 i->empty = 1;
940 return -EINVAL;
941 }
942 t.min = div_down(best_num, best_den);
943 t.openmin = !!(best_num % best_den);
944
945 best_num = best_den = best_diff = 0;
946 for (k = 0; k < rats_count; ++k) {
947 unsigned int num;
948 unsigned int den = rats[k].den;
949 unsigned int q = i->max;
950 int diff;
951 num = mul(q, den);
952 if (num < rats[k].num_min)
953 continue;
954 if (num > rats[k].num_max)
955 num = rats[k].num_max;
956 else {
957 unsigned int r;
958 r = (num - rats[k].num_min) % rats[k].num_step;
959 if (r != 0)
960 num -= r;
961 }
962 diff = q * den - num;
963 if (best_num == 0 ||
964 diff * best_den < best_diff * den) {
965 best_diff = diff;
966 best_den = den;
967 best_num = num;
968 }
969 }
970 if (best_den == 0) {
971 i->empty = 1;
972 return -EINVAL;
973 }
974 t.max = div_up(best_num, best_den);
975 t.openmax = !!(best_num % best_den);
976 t.integer = 0;
977 err = snd_interval_refine(i, &t);
978 if (err < 0)
979 return err;
980
981 if (snd_interval_single(i)) {
982 if (nump)
983 *nump = best_num;
984 if (denp)
985 *denp = best_den;
986 }
987 return err;
988}
989
990/**
991 * snd_interval_list - refine the interval value from the list
992 * @i: the interval value to refine
993 * @count: the number of elements in the list
994 * @list: the value list
995 * @mask: the bit-mask to evaluate
996 *
997 * Refines the interval value from the list.
998 * When mask is non-zero, only the elements corresponding to bit 1 are
999 * evaluated.
1000 *
1001 * Return: Positive if the value is changed, zero if it's not changed, or a
1002 * negative error code.
1003 */
1004int snd_interval_list(struct snd_interval *i, unsigned int count,
1005 const unsigned int *list, unsigned int mask)
1006{
1007 unsigned int k;
1008 struct snd_interval list_range;
1009
1010 if (!count) {
1011 i->empty = 1;
1012 return -EINVAL;
1013 }
1014 snd_interval_any(&list_range);
1015 list_range.min = UINT_MAX;
1016 list_range.max = 0;
1017 for (k = 0; k < count; k++) {
1018 if (mask && !(mask & (1 << k)))
1019 continue;
1020 if (!snd_interval_test(i, list[k]))
1021 continue;
1022 list_range.min = min(list_range.min, list[k]);
1023 list_range.max = max(list_range.max, list[k]);
1024 }
1025 return snd_interval_refine(i, &list_range);
1026}
1027EXPORT_SYMBOL(snd_interval_list);
1028
1029/**
1030 * snd_interval_ranges - refine the interval value from the list of ranges
1031 * @i: the interval value to refine
1032 * @count: the number of elements in the list of ranges
1033 * @ranges: the ranges list
1034 * @mask: the bit-mask to evaluate
1035 *
1036 * Refines the interval value from the list of ranges.
1037 * When mask is non-zero, only the elements corresponding to bit 1 are
1038 * evaluated.
1039 *
1040 * Return: Positive if the value is changed, zero if it's not changed, or a
1041 * negative error code.
1042 */
1043int snd_interval_ranges(struct snd_interval *i, unsigned int count,
1044 const struct snd_interval *ranges, unsigned int mask)
1045{
1046 unsigned int k;
1047 struct snd_interval range_union;
1048 struct snd_interval range;
1049
1050 if (!count) {
1051 snd_interval_none(i);
1052 return -EINVAL;
1053 }
1054 snd_interval_any(&range_union);
1055 range_union.min = UINT_MAX;
1056 range_union.max = 0;
1057 for (k = 0; k < count; k++) {
1058 if (mask && !(mask & (1 << k)))
1059 continue;
1060 snd_interval_copy(&range, &ranges[k]);
1061 if (snd_interval_refine(&range, i) < 0)
1062 continue;
1063 if (snd_interval_empty(&range))
1064 continue;
1065
1066 if (range.min < range_union.min) {
1067 range_union.min = range.min;
1068 range_union.openmin = 1;
1069 }
1070 if (range.min == range_union.min && !range.openmin)
1071 range_union.openmin = 0;
1072 if (range.max > range_union.max) {
1073 range_union.max = range.max;
1074 range_union.openmax = 1;
1075 }
1076 if (range.max == range_union.max && !range.openmax)
1077 range_union.openmax = 0;
1078 }
1079 return snd_interval_refine(i, &range_union);
1080}
1081EXPORT_SYMBOL(snd_interval_ranges);
1082
1083static int snd_interval_step(struct snd_interval *i, unsigned int step)
1084{
1085 unsigned int n;
1086 int changed = 0;
1087 n = i->min % step;
1088 if (n != 0 || i->openmin) {
1089 i->min += step - n;
1090 i->openmin = 0;
1091 changed = 1;
1092 }
1093 n = i->max % step;
1094 if (n != 0 || i->openmax) {
1095 i->max -= n;
1096 i->openmax = 0;
1097 changed = 1;
1098 }
1099 if (snd_interval_checkempty(i)) {
1100 i->empty = 1;
1101 return -EINVAL;
1102 }
1103 return changed;
1104}
1105
1106/* Info constraints helpers */
1107
1108/**
1109 * snd_pcm_hw_rule_add - add the hw-constraint rule
1110 * @runtime: the pcm runtime instance
1111 * @cond: condition bits
1112 * @var: the variable to evaluate
1113 * @func: the evaluation function
1114 * @private: the private data pointer passed to function
1115 * @dep: the dependent variables
1116 *
1117 * Return: Zero if successful, or a negative error code on failure.
1118 */
1119int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
1120 int var,
1121 snd_pcm_hw_rule_func_t func, void *private,
1122 int dep, ...)
1123{
1124 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1125 struct snd_pcm_hw_rule *c;
1126 unsigned int k;
1127 va_list args;
1128 va_start(args, dep);
1129 if (constrs->rules_num >= constrs->rules_all) {
1130 struct snd_pcm_hw_rule *new;
1131 unsigned int new_rules = constrs->rules_all + 16;
1132 new = krealloc(constrs->rules, new_rules * sizeof(*c),
1133 GFP_KERNEL);
1134 if (!new) {
1135 va_end(args);
1136 return -ENOMEM;
1137 }
1138 constrs->rules = new;
1139 constrs->rules_all = new_rules;
1140 }
1141 c = &constrs->rules[constrs->rules_num];
1142 c->cond = cond;
1143 c->func = func;
1144 c->var = var;
1145 c->private = private;
1146 k = 0;
1147 while (1) {
1148 if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps))) {
1149 va_end(args);
1150 return -EINVAL;
1151 }
1152 c->deps[k++] = dep;
1153 if (dep < 0)
1154 break;
1155 dep = va_arg(args, int);
1156 }
1157 constrs->rules_num++;
1158 va_end(args);
1159 return 0;
1160}
1161EXPORT_SYMBOL(snd_pcm_hw_rule_add);
1162
1163/**
1164 * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
1165 * @runtime: PCM runtime instance
1166 * @var: hw_params variable to apply the mask
1167 * @mask: the bitmap mask
1168 *
1169 * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
1170 *
1171 * Return: Zero if successful, or a negative error code on failure.
1172 */
1173int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1174 u_int32_t mask)
1175{
1176 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1177 struct snd_mask *maskp = constrs_mask(constrs, var);
1178 *maskp->bits &= mask;
1179 memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
1180 if (*maskp->bits == 0)
1181 return -EINVAL;
1182 return 0;
1183}
1184
1185/**
1186 * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
1187 * @runtime: PCM runtime instance
1188 * @var: hw_params variable to apply the mask
1189 * @mask: the 64bit bitmap mask
1190 *
1191 * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
1192 *
1193 * Return: Zero if successful, or a negative error code on failure.
1194 */
1195int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1196 u_int64_t mask)
1197{
1198 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1199 struct snd_mask *maskp = constrs_mask(constrs, var);
1200 maskp->bits[0] &= (u_int32_t)mask;
1201 maskp->bits[1] &= (u_int32_t)(mask >> 32);
1202 memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
1203 if (! maskp->bits[0] && ! maskp->bits[1])
1204 return -EINVAL;
1205 return 0;
1206}
1207EXPORT_SYMBOL(snd_pcm_hw_constraint_mask64);
1208
1209/**
1210 * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
1211 * @runtime: PCM runtime instance
1212 * @var: hw_params variable to apply the integer constraint
1213 *
1214 * Apply the constraint of integer to an interval parameter.
1215 *
1216 * Return: Positive if the value is changed, zero if it's not changed, or a
1217 * negative error code.
1218 */
1219int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
1220{
1221 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1222 return snd_interval_setinteger(constrs_interval(constrs, var));
1223}
1224EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
1225
1226/**
1227 * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
1228 * @runtime: PCM runtime instance
1229 * @var: hw_params variable to apply the range
1230 * @min: the minimal value
1231 * @max: the maximal value
1232 *
1233 * Apply the min/max range constraint to an interval parameter.
1234 *
1235 * Return: Positive if the value is changed, zero if it's not changed, or a
1236 * negative error code.
1237 */
1238int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1239 unsigned int min, unsigned int max)
1240{
1241 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1242 struct snd_interval t;
1243 t.min = min;
1244 t.max = max;
1245 t.openmin = t.openmax = 0;
1246 t.integer = 0;
1247 return snd_interval_refine(constrs_interval(constrs, var), &t);
1248}
1249EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
1250
1251static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
1252 struct snd_pcm_hw_rule *rule)
1253{
1254 struct snd_pcm_hw_constraint_list *list = rule->private;
1255 return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
1256}
1257
1258
1259/**
1260 * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
1261 * @runtime: PCM runtime instance
1262 * @cond: condition bits
1263 * @var: hw_params variable to apply the list constraint
1264 * @l: list
1265 *
1266 * Apply the list of constraints to an interval parameter.
1267 *
1268 * Return: Zero if successful, or a negative error code on failure.
1269 */
1270int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1271 unsigned int cond,
1272 snd_pcm_hw_param_t var,
1273 const struct snd_pcm_hw_constraint_list *l)
1274{
1275 return snd_pcm_hw_rule_add(runtime, cond, var,
1276 snd_pcm_hw_rule_list, (void *)l,
1277 var, -1);
1278}
1279EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
1280
1281static int snd_pcm_hw_rule_ranges(struct snd_pcm_hw_params *params,
1282 struct snd_pcm_hw_rule *rule)
1283{
1284 struct snd_pcm_hw_constraint_ranges *r = rule->private;
1285 return snd_interval_ranges(hw_param_interval(params, rule->var),
1286 r->count, r->ranges, r->mask);
1287}
1288
1289
1290/**
1291 * snd_pcm_hw_constraint_ranges - apply list of range constraints to a parameter
1292 * @runtime: PCM runtime instance
1293 * @cond: condition bits
1294 * @var: hw_params variable to apply the list of range constraints
1295 * @r: ranges
1296 *
1297 * Apply the list of range constraints to an interval parameter.
1298 *
1299 * Return: Zero if successful, or a negative error code on failure.
1300 */
1301int snd_pcm_hw_constraint_ranges(struct snd_pcm_runtime *runtime,
1302 unsigned int cond,
1303 snd_pcm_hw_param_t var,
1304 const struct snd_pcm_hw_constraint_ranges *r)
1305{
1306 return snd_pcm_hw_rule_add(runtime, cond, var,
1307 snd_pcm_hw_rule_ranges, (void *)r,
1308 var, -1);
1309}
1310EXPORT_SYMBOL(snd_pcm_hw_constraint_ranges);
1311
1312static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
1313 struct snd_pcm_hw_rule *rule)
1314{
1315 const struct snd_pcm_hw_constraint_ratnums *r = rule->private;
1316 unsigned int num = 0, den = 0;
1317 int err;
1318 err = snd_interval_ratnum(hw_param_interval(params, rule->var),
1319 r->nrats, r->rats, &num, &den);
1320 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1321 params->rate_num = num;
1322 params->rate_den = den;
1323 }
1324 return err;
1325}
1326
1327/**
1328 * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
1329 * @runtime: PCM runtime instance
1330 * @cond: condition bits
1331 * @var: hw_params variable to apply the ratnums constraint
1332 * @r: struct snd_ratnums constriants
1333 *
1334 * Return: Zero if successful, or a negative error code on failure.
1335 */
1336int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1337 unsigned int cond,
1338 snd_pcm_hw_param_t var,
1339 const struct snd_pcm_hw_constraint_ratnums *r)
1340{
1341 return snd_pcm_hw_rule_add(runtime, cond, var,
1342 snd_pcm_hw_rule_ratnums, (void *)r,
1343 var, -1);
1344}
1345EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
1346
1347static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
1348 struct snd_pcm_hw_rule *rule)
1349{
1350 const struct snd_pcm_hw_constraint_ratdens *r = rule->private;
1351 unsigned int num = 0, den = 0;
1352 int err = snd_interval_ratden(hw_param_interval(params, rule->var),
1353 r->nrats, r->rats, &num, &den);
1354 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1355 params->rate_num = num;
1356 params->rate_den = den;
1357 }
1358 return err;
1359}
1360
1361/**
1362 * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
1363 * @runtime: PCM runtime instance
1364 * @cond: condition bits
1365 * @var: hw_params variable to apply the ratdens constraint
1366 * @r: struct snd_ratdens constriants
1367 *
1368 * Return: Zero if successful, or a negative error code on failure.
1369 */
1370int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1371 unsigned int cond,
1372 snd_pcm_hw_param_t var,
1373 const struct snd_pcm_hw_constraint_ratdens *r)
1374{
1375 return snd_pcm_hw_rule_add(runtime, cond, var,
1376 snd_pcm_hw_rule_ratdens, (void *)r,
1377 var, -1);
1378}
1379EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
1380
1381static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
1382 struct snd_pcm_hw_rule *rule)
1383{
1384 unsigned int l = (unsigned long) rule->private;
1385 int width = l & 0xffff;
1386 unsigned int msbits = l >> 16;
1387 const struct snd_interval *i =
1388 hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
1389
1390 if (!snd_interval_single(i))
1391 return 0;
1392
1393 if ((snd_interval_value(i) == width) ||
1394 (width == 0 && snd_interval_value(i) > msbits))
1395 params->msbits = min_not_zero(params->msbits, msbits);
1396
1397 return 0;
1398}
1399
1400/**
1401 * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
1402 * @runtime: PCM runtime instance
1403 * @cond: condition bits
1404 * @width: sample bits width
1405 * @msbits: msbits width
1406 *
1407 * This constraint will set the number of most significant bits (msbits) if a
1408 * sample format with the specified width has been select. If width is set to 0
1409 * the msbits will be set for any sample format with a width larger than the
1410 * specified msbits.
1411 *
1412 * Return: Zero if successful, or a negative error code on failure.
1413 */
1414int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1415 unsigned int cond,
1416 unsigned int width,
1417 unsigned int msbits)
1418{
1419 unsigned long l = (msbits << 16) | width;
1420 return snd_pcm_hw_rule_add(runtime, cond, -1,
1421 snd_pcm_hw_rule_msbits,
1422 (void*) l,
1423 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1424}
1425EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
1426
1427static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
1428 struct snd_pcm_hw_rule *rule)
1429{
1430 unsigned long step = (unsigned long) rule->private;
1431 return snd_interval_step(hw_param_interval(params, rule->var), step);
1432}
1433
1434/**
1435 * snd_pcm_hw_constraint_step - add a hw constraint step rule
1436 * @runtime: PCM runtime instance
1437 * @cond: condition bits
1438 * @var: hw_params variable to apply the step constraint
1439 * @step: step size
1440 *
1441 * Return: Zero if successful, or a negative error code on failure.
1442 */
1443int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1444 unsigned int cond,
1445 snd_pcm_hw_param_t var,
1446 unsigned long step)
1447{
1448 return snd_pcm_hw_rule_add(runtime, cond, var,
1449 snd_pcm_hw_rule_step, (void *) step,
1450 var, -1);
1451}
1452EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
1453
1454static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
1455{
1456 static unsigned int pow2_sizes[] = {
1457 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1458 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1459 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1460 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1461 };
1462 return snd_interval_list(hw_param_interval(params, rule->var),
1463 ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
1464}
1465
1466/**
1467 * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
1468 * @runtime: PCM runtime instance
1469 * @cond: condition bits
1470 * @var: hw_params variable to apply the power-of-2 constraint
1471 *
1472 * Return: Zero if successful, or a negative error code on failure.
1473 */
1474int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1475 unsigned int cond,
1476 snd_pcm_hw_param_t var)
1477{
1478 return snd_pcm_hw_rule_add(runtime, cond, var,
1479 snd_pcm_hw_rule_pow2, NULL,
1480 var, -1);
1481}
1482EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
1483
1484static int snd_pcm_hw_rule_noresample_func(struct snd_pcm_hw_params *params,
1485 struct snd_pcm_hw_rule *rule)
1486{
1487 unsigned int base_rate = (unsigned int)(uintptr_t)rule->private;
1488 struct snd_interval *rate;
1489
1490 rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1491 return snd_interval_list(rate, 1, &base_rate, 0);
1492}
1493
1494/**
1495 * snd_pcm_hw_rule_noresample - add a rule to allow disabling hw resampling
1496 * @runtime: PCM runtime instance
1497 * @base_rate: the rate at which the hardware does not resample
1498 *
1499 * Return: Zero if successful, or a negative error code on failure.
1500 */
1501int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
1502 unsigned int base_rate)
1503{
1504 return snd_pcm_hw_rule_add(runtime, SNDRV_PCM_HW_PARAMS_NORESAMPLE,
1505 SNDRV_PCM_HW_PARAM_RATE,
1506 snd_pcm_hw_rule_noresample_func,
1507 (void *)(uintptr_t)base_rate,
1508 SNDRV_PCM_HW_PARAM_RATE, -1);
1509}
1510EXPORT_SYMBOL(snd_pcm_hw_rule_noresample);
1511
1512static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
1513 snd_pcm_hw_param_t var)
1514{
1515 if (hw_is_mask(var)) {
1516 snd_mask_any(hw_param_mask(params, var));
1517 params->cmask |= 1 << var;
1518 params->rmask |= 1 << var;
1519 return;
1520 }
1521 if (hw_is_interval(var)) {
1522 snd_interval_any(hw_param_interval(params, var));
1523 params->cmask |= 1 << var;
1524 params->rmask |= 1 << var;
1525 return;
1526 }
1527 snd_BUG();
1528}
1529
1530void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
1531{
1532 unsigned int k;
1533 memset(params, 0, sizeof(*params));
1534 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1535 _snd_pcm_hw_param_any(params, k);
1536 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1537 _snd_pcm_hw_param_any(params, k);
1538 params->info = ~0U;
1539}
1540EXPORT_SYMBOL(_snd_pcm_hw_params_any);
1541
1542/**
1543 * snd_pcm_hw_param_value - return @params field @var value
1544 * @params: the hw_params instance
1545 * @var: parameter to retrieve
1546 * @dir: pointer to the direction (-1,0,1) or %NULL
1547 *
1548 * Return: The value for field @var if it's fixed in configuration space
1549 * defined by @params. -%EINVAL otherwise.
1550 */
1551int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
1552 snd_pcm_hw_param_t var, int *dir)
1553{
1554 if (hw_is_mask(var)) {
1555 const struct snd_mask *mask = hw_param_mask_c(params, var);
1556 if (!snd_mask_single(mask))
1557 return -EINVAL;
1558 if (dir)
1559 *dir = 0;
1560 return snd_mask_value(mask);
1561 }
1562 if (hw_is_interval(var)) {
1563 const struct snd_interval *i = hw_param_interval_c(params, var);
1564 if (!snd_interval_single(i))
1565 return -EINVAL;
1566 if (dir)
1567 *dir = i->openmin;
1568 return snd_interval_value(i);
1569 }
1570 return -EINVAL;
1571}
1572EXPORT_SYMBOL(snd_pcm_hw_param_value);
1573
1574void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
1575 snd_pcm_hw_param_t var)
1576{
1577 if (hw_is_mask(var)) {
1578 snd_mask_none(hw_param_mask(params, var));
1579 params->cmask |= 1 << var;
1580 params->rmask |= 1 << var;
1581 } else if (hw_is_interval(var)) {
1582 snd_interval_none(hw_param_interval(params, var));
1583 params->cmask |= 1 << var;
1584 params->rmask |= 1 << var;
1585 } else {
1586 snd_BUG();
1587 }
1588}
1589EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
1590
1591static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
1592 snd_pcm_hw_param_t var)
1593{
1594 int changed;
1595 if (hw_is_mask(var))
1596 changed = snd_mask_refine_first(hw_param_mask(params, var));
1597 else if (hw_is_interval(var))
1598 changed = snd_interval_refine_first(hw_param_interval(params, var));
1599 else
1600 return -EINVAL;
1601 if (changed > 0) {
1602 params->cmask |= 1 << var;
1603 params->rmask |= 1 << var;
1604 }
1605 return changed;
1606}
1607
1608
1609/**
1610 * snd_pcm_hw_param_first - refine config space and return minimum value
1611 * @pcm: PCM instance
1612 * @params: the hw_params instance
1613 * @var: parameter to retrieve
1614 * @dir: pointer to the direction (-1,0,1) or %NULL
1615 *
1616 * Inside configuration space defined by @params remove from @var all
1617 * values > minimum. Reduce configuration space accordingly.
1618 *
1619 * Return: The minimum, or a negative error code on failure.
1620 */
1621int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
1622 struct snd_pcm_hw_params *params,
1623 snd_pcm_hw_param_t var, int *dir)
1624{
1625 int changed = _snd_pcm_hw_param_first(params, var);
1626 if (changed < 0)
1627 return changed;
1628 if (params->rmask) {
1629 int err = snd_pcm_hw_refine(pcm, params);
1630 if (err < 0)
1631 return err;
1632 }
1633 return snd_pcm_hw_param_value(params, var, dir);
1634}
1635EXPORT_SYMBOL(snd_pcm_hw_param_first);
1636
1637static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
1638 snd_pcm_hw_param_t var)
1639{
1640 int changed;
1641 if (hw_is_mask(var))
1642 changed = snd_mask_refine_last(hw_param_mask(params, var));
1643 else if (hw_is_interval(var))
1644 changed = snd_interval_refine_last(hw_param_interval(params, var));
1645 else
1646 return -EINVAL;
1647 if (changed > 0) {
1648 params->cmask |= 1 << var;
1649 params->rmask |= 1 << var;
1650 }
1651 return changed;
1652}
1653
1654
1655/**
1656 * snd_pcm_hw_param_last - refine config space and return maximum value
1657 * @pcm: PCM instance
1658 * @params: the hw_params instance
1659 * @var: parameter to retrieve
1660 * @dir: pointer to the direction (-1,0,1) or %NULL
1661 *
1662 * Inside configuration space defined by @params remove from @var all
1663 * values < maximum. Reduce configuration space accordingly.
1664 *
1665 * Return: The maximum, or a negative error code on failure.
1666 */
1667int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
1668 struct snd_pcm_hw_params *params,
1669 snd_pcm_hw_param_t var, int *dir)
1670{
1671 int changed = _snd_pcm_hw_param_last(params, var);
1672 if (changed < 0)
1673 return changed;
1674 if (params->rmask) {
1675 int err = snd_pcm_hw_refine(pcm, params);
1676 if (err < 0)
1677 return err;
1678 }
1679 return snd_pcm_hw_param_value(params, var, dir);
1680}
1681EXPORT_SYMBOL(snd_pcm_hw_param_last);
1682
1683static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
1684 void *arg)
1685{
1686 struct snd_pcm_runtime *runtime = substream->runtime;
1687 unsigned long flags;
1688 snd_pcm_stream_lock_irqsave(substream, flags);
1689 if (snd_pcm_running(substream) &&
1690 snd_pcm_update_hw_ptr(substream) >= 0)
1691 runtime->status->hw_ptr %= runtime->buffer_size;
1692 else {
1693 runtime->status->hw_ptr = 0;
1694 runtime->hw_ptr_wrap = 0;
1695 }
1696 snd_pcm_stream_unlock_irqrestore(substream, flags);
1697 return 0;
1698}
1699
1700static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
1701 void *arg)
1702{
1703 struct snd_pcm_channel_info *info = arg;
1704 struct snd_pcm_runtime *runtime = substream->runtime;
1705 int width;
1706 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1707 info->offset = -1;
1708 return 0;
1709 }
1710 width = snd_pcm_format_physical_width(runtime->format);
1711 if (width < 0)
1712 return width;
1713 info->offset = 0;
1714 switch (runtime->access) {
1715 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1716 case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1717 info->first = info->channel * width;
1718 info->step = runtime->channels * width;
1719 break;
1720 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1721 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1722 {
1723 size_t size = runtime->dma_bytes / runtime->channels;
1724 info->first = info->channel * size * 8;
1725 info->step = width;
1726 break;
1727 }
1728 default:
1729 snd_BUG();
1730 break;
1731 }
1732 return 0;
1733}
1734
1735static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
1736 void *arg)
1737{
1738 struct snd_pcm_hw_params *params = arg;
1739 snd_pcm_format_t format;
1740 int channels;
1741 ssize_t frame_size;
1742
1743 params->fifo_size = substream->runtime->hw.fifo_size;
1744 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) {
1745 format = params_format(params);
1746 channels = params_channels(params);
1747 frame_size = snd_pcm_format_size(format, channels);
1748 if (frame_size > 0)
1749 params->fifo_size /= (unsigned)frame_size;
1750 }
1751 return 0;
1752}
1753
1754/**
1755 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1756 * @substream: the pcm substream instance
1757 * @cmd: ioctl command
1758 * @arg: ioctl argument
1759 *
1760 * Processes the generic ioctl commands for PCM.
1761 * Can be passed as the ioctl callback for PCM ops.
1762 *
1763 * Return: Zero if successful, or a negative error code on failure.
1764 */
1765int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1766 unsigned int cmd, void *arg)
1767{
1768 switch (cmd) {
1769 case SNDRV_PCM_IOCTL1_RESET:
1770 return snd_pcm_lib_ioctl_reset(substream, arg);
1771 case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1772 return snd_pcm_lib_ioctl_channel_info(substream, arg);
1773 case SNDRV_PCM_IOCTL1_FIFO_SIZE:
1774 return snd_pcm_lib_ioctl_fifo_size(substream, arg);
1775 }
1776 return -ENXIO;
1777}
1778EXPORT_SYMBOL(snd_pcm_lib_ioctl);
1779
1780/**
1781 * snd_pcm_period_elapsed - update the pcm status for the next period
1782 * @substream: the pcm substream instance
1783 *
1784 * This function is called from the interrupt handler when the
1785 * PCM has processed the period size. It will update the current
1786 * pointer, wake up sleepers, etc.
1787 *
1788 * Even if more than one periods have elapsed since the last call, you
1789 * have to call this only once.
1790 */
1791void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
1792{
1793 struct snd_pcm_runtime *runtime;
1794 unsigned long flags;
1795
1796 if (PCM_RUNTIME_CHECK(substream))
1797 return;
1798 runtime = substream->runtime;
1799
1800 snd_pcm_stream_lock_irqsave(substream, flags);
1801 if (!snd_pcm_running(substream) ||
1802 snd_pcm_update_hw_ptr0(substream, 1) < 0)
1803 goto _end;
1804
1805#ifdef CONFIG_SND_PCM_TIMER
1806 if (substream->timer_running)
1807 snd_timer_interrupt(substream->timer, 1);
1808#endif
1809 _end:
1810 kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
1811 snd_pcm_stream_unlock_irqrestore(substream, flags);
1812}
1813EXPORT_SYMBOL(snd_pcm_period_elapsed);
1814
1815/*
1816 * Wait until avail_min data becomes available
1817 * Returns a negative error code if any error occurs during operation.
1818 * The available space is stored on availp. When err = 0 and avail = 0
1819 * on the capture stream, it indicates the stream is in DRAINING state.
1820 */
1821static int wait_for_avail(struct snd_pcm_substream *substream,
1822 snd_pcm_uframes_t *availp)
1823{
1824 struct snd_pcm_runtime *runtime = substream->runtime;
1825 int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
1826 wait_queue_entry_t wait;
1827 int err = 0;
1828 snd_pcm_uframes_t avail = 0;
1829 long wait_time, tout;
1830
1831 init_waitqueue_entry(&wait, current);
1832 set_current_state(TASK_INTERRUPTIBLE);
1833 add_wait_queue(&runtime->tsleep, &wait);
1834
1835 if (runtime->no_period_wakeup)
1836 wait_time = MAX_SCHEDULE_TIMEOUT;
1837 else {
1838 wait_time = 10;
1839 if (runtime->rate) {
1840 long t = runtime->period_size * 2 / runtime->rate;
1841 wait_time = max(t, wait_time);
1842 }
1843 wait_time = msecs_to_jiffies(wait_time * 1000);
1844 }
1845
1846 for (;;) {
1847 if (signal_pending(current)) {
1848 err = -ERESTARTSYS;
1849 break;
1850 }
1851
1852 /*
1853 * We need to check if space became available already
1854 * (and thus the wakeup happened already) first to close
1855 * the race of space already having become available.
1856 * This check must happen after been added to the waitqueue
1857 * and having current state be INTERRUPTIBLE.
1858 */
1859 if (is_playback)
1860 avail = snd_pcm_playback_avail(runtime);
1861 else
1862 avail = snd_pcm_capture_avail(runtime);
1863 if (avail >= runtime->twake)
1864 break;
1865 snd_pcm_stream_unlock_irq(substream);
1866
1867 tout = schedule_timeout(wait_time);
1868
1869 snd_pcm_stream_lock_irq(substream);
1870 set_current_state(TASK_INTERRUPTIBLE);
1871 switch (runtime->status->state) {
1872 case SNDRV_PCM_STATE_SUSPENDED:
1873 err = -ESTRPIPE;
1874 goto _endloop;
1875 case SNDRV_PCM_STATE_XRUN:
1876 err = -EPIPE;
1877 goto _endloop;
1878 case SNDRV_PCM_STATE_DRAINING:
1879 if (is_playback)
1880 err = -EPIPE;
1881 else
1882 avail = 0; /* indicate draining */
1883 goto _endloop;
1884 case SNDRV_PCM_STATE_OPEN:
1885 case SNDRV_PCM_STATE_SETUP:
1886 case SNDRV_PCM_STATE_DISCONNECTED:
1887 err = -EBADFD;
1888 goto _endloop;
1889 case SNDRV_PCM_STATE_PAUSED:
1890 continue;
1891 }
1892 if (!tout) {
1893 pcm_dbg(substream->pcm,
1894 "%s write error (DMA or IRQ trouble?)\n",
1895 is_playback ? "playback" : "capture");
1896 err = -EIO;
1897 break;
1898 }
1899 }
1900 _endloop:
1901 set_current_state(TASK_RUNNING);
1902 remove_wait_queue(&runtime->tsleep, &wait);
1903 *availp = avail;
1904 return err;
1905}
1906
1907typedef int (*pcm_transfer_f)(struct snd_pcm_substream *substream,
1908 int channel, unsigned long hwoff,
1909 void *buf, unsigned long bytes);
1910
1911typedef int (*pcm_copy_f)(struct snd_pcm_substream *, snd_pcm_uframes_t, void *,
1912 snd_pcm_uframes_t, snd_pcm_uframes_t, pcm_transfer_f);
1913
1914/* calculate the target DMA-buffer position to be written/read */
1915static void *get_dma_ptr(struct snd_pcm_runtime *runtime,
1916 int channel, unsigned long hwoff)
1917{
1918 return runtime->dma_area + hwoff +
1919 channel * (runtime->dma_bytes / runtime->channels);
1920}
1921
1922/* default copy_user ops for write; used for both interleaved and non- modes */
1923static int default_write_copy(struct snd_pcm_substream *substream,
1924 int channel, unsigned long hwoff,
1925 void *buf, unsigned long bytes)
1926{
1927 if (copy_from_user(get_dma_ptr(substream->runtime, channel, hwoff),
1928 (void __user *)buf, bytes))
1929 return -EFAULT;
1930 return 0;
1931}
1932
1933/* default copy_kernel ops for write */
1934static int default_write_copy_kernel(struct snd_pcm_substream *substream,
1935 int channel, unsigned long hwoff,
1936 void *buf, unsigned long bytes)
1937{
1938 memcpy(get_dma_ptr(substream->runtime, channel, hwoff), buf, bytes);
1939 return 0;
1940}
1941
1942/* fill silence instead of copy data; called as a transfer helper
1943 * from __snd_pcm_lib_write() or directly from noninterleaved_copy() when
1944 * a NULL buffer is passed
1945 */
1946static int fill_silence(struct snd_pcm_substream *substream, int channel,
1947 unsigned long hwoff, void *buf, unsigned long bytes)
1948{
1949 struct snd_pcm_runtime *runtime = substream->runtime;
1950
1951 if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
1952 return 0;
1953 if (substream->ops->fill_silence)
1954 return substream->ops->fill_silence(substream, channel,
1955 hwoff, bytes);
1956
1957 snd_pcm_format_set_silence(runtime->format,
1958 get_dma_ptr(runtime, channel, hwoff),
1959 bytes_to_samples(runtime, bytes));
1960 return 0;
1961}
1962
1963/* default copy_user ops for read; used for both interleaved and non- modes */
1964static int default_read_copy(struct snd_pcm_substream *substream,
1965 int channel, unsigned long hwoff,
1966 void *buf, unsigned long bytes)
1967{
1968 if (copy_to_user((void __user *)buf,
1969 get_dma_ptr(substream->runtime, channel, hwoff),
1970 bytes))
1971 return -EFAULT;
1972 return 0;
1973}
1974
1975/* default copy_kernel ops for read */
1976static int default_read_copy_kernel(struct snd_pcm_substream *substream,
1977 int channel, unsigned long hwoff,
1978 void *buf, unsigned long bytes)
1979{
1980 memcpy(buf, get_dma_ptr(substream->runtime, channel, hwoff), bytes);
1981 return 0;
1982}
1983
1984/* call transfer function with the converted pointers and sizes;
1985 * for interleaved mode, it's one shot for all samples
1986 */
1987static int interleaved_copy(struct snd_pcm_substream *substream,
1988 snd_pcm_uframes_t hwoff, void *data,
1989 snd_pcm_uframes_t off,
1990 snd_pcm_uframes_t frames,
1991 pcm_transfer_f transfer)
1992{
1993 struct snd_pcm_runtime *runtime = substream->runtime;
1994
1995 /* convert to bytes */
1996 hwoff = frames_to_bytes(runtime, hwoff);
1997 off = frames_to_bytes(runtime, off);
1998 frames = frames_to_bytes(runtime, frames);
1999 return transfer(substream, 0, hwoff, data + off, frames);
2000}
2001
2002/* call transfer function with the converted pointers and sizes for each
2003 * non-interleaved channel; when buffer is NULL, silencing instead of copying
2004 */
2005static int noninterleaved_copy(struct snd_pcm_substream *substream,
2006 snd_pcm_uframes_t hwoff, void *data,
2007 snd_pcm_uframes_t off,
2008 snd_pcm_uframes_t frames,
2009 pcm_transfer_f transfer)
2010{
2011 struct snd_pcm_runtime *runtime = substream->runtime;
2012 int channels = runtime->channels;
2013 void **bufs = data;
2014 int c, err;
2015
2016 /* convert to bytes; note that it's not frames_to_bytes() here.
2017 * in non-interleaved mode, we copy for each channel, thus
2018 * each copy is n_samples bytes x channels = whole frames.
2019 */
2020 off = samples_to_bytes(runtime, off);
2021 frames = samples_to_bytes(runtime, frames);
2022 hwoff = samples_to_bytes(runtime, hwoff);
2023 for (c = 0; c < channels; ++c, ++bufs) {
2024 if (!data || !*bufs)
2025 err = fill_silence(substream, c, hwoff, NULL, frames);
2026 else
2027 err = transfer(substream, c, hwoff, *bufs + off,
2028 frames);
2029 if (err < 0)
2030 return err;
2031 }
2032 return 0;
2033}
2034
2035/* fill silence on the given buffer position;
2036 * called from snd_pcm_playback_silence()
2037 */
2038static int fill_silence_frames(struct snd_pcm_substream *substream,
2039 snd_pcm_uframes_t off, snd_pcm_uframes_t frames)
2040{
2041 if (substream->runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
2042 substream->runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED)
2043 return interleaved_copy(substream, off, NULL, 0, frames,
2044 fill_silence);
2045 else
2046 return noninterleaved_copy(substream, off, NULL, 0, frames,
2047 fill_silence);
2048}
2049
2050/* sanity-check for read/write methods */
2051static int pcm_sanity_check(struct snd_pcm_substream *substream)
2052{
2053 struct snd_pcm_runtime *runtime;
2054 if (PCM_RUNTIME_CHECK(substream))
2055 return -ENXIO;
2056 runtime = substream->runtime;
2057 if (snd_BUG_ON(!substream->ops->copy_user && !runtime->dma_area))
2058 return -EINVAL;
2059 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2060 return -EBADFD;
2061 return 0;
2062}
2063
2064static int pcm_accessible_state(struct snd_pcm_runtime *runtime)
2065{
2066 switch (runtime->status->state) {
2067 case SNDRV_PCM_STATE_PREPARED:
2068 case SNDRV_PCM_STATE_RUNNING:
2069 case SNDRV_PCM_STATE_PAUSED:
2070 return 0;
2071 case SNDRV_PCM_STATE_XRUN:
2072 return -EPIPE;
2073 case SNDRV_PCM_STATE_SUSPENDED:
2074 return -ESTRPIPE;
2075 default:
2076 return -EBADFD;
2077 }
2078}
2079
2080/* update to the given appl_ptr and call ack callback if needed;
2081 * when an error is returned, take back to the original value
2082 */
2083int pcm_lib_apply_appl_ptr(struct snd_pcm_substream *substream,
2084 snd_pcm_uframes_t appl_ptr)
2085{
2086 struct snd_pcm_runtime *runtime = substream->runtime;
2087 snd_pcm_uframes_t old_appl_ptr = runtime->control->appl_ptr;
2088 int ret;
2089
2090 if (old_appl_ptr == appl_ptr)
2091 return 0;
2092
2093 runtime->control->appl_ptr = appl_ptr;
2094 if (substream->ops->ack) {
2095 ret = substream->ops->ack(substream);
2096 if (ret < 0) {
2097 runtime->control->appl_ptr = old_appl_ptr;
2098 return ret;
2099 }
2100 }
2101
2102 trace_applptr(substream, old_appl_ptr, appl_ptr);
2103
2104 return 0;
2105}
2106
2107/* the common loop for read/write data */
2108snd_pcm_sframes_t __snd_pcm_lib_xfer(struct snd_pcm_substream *substream,
2109 void *data, bool interleaved,
2110 snd_pcm_uframes_t size, bool in_kernel)
2111{
2112 struct snd_pcm_runtime *runtime = substream->runtime;
2113 snd_pcm_uframes_t xfer = 0;
2114 snd_pcm_uframes_t offset = 0;
2115 snd_pcm_uframes_t avail;
2116 pcm_copy_f writer;
2117 pcm_transfer_f transfer;
2118 bool nonblock;
2119 bool is_playback;
2120 int err;
2121
2122 err = pcm_sanity_check(substream);
2123 if (err < 0)
2124 return err;
2125
2126 is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
2127 if (interleaved) {
2128 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
2129 runtime->channels > 1)
2130 return -EINVAL;
2131 writer = interleaved_copy;
2132 } else {
2133 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2134 return -EINVAL;
2135 writer = noninterleaved_copy;
2136 }
2137
2138 if (!data) {
2139 if (is_playback)
2140 transfer = fill_silence;
2141 else
2142 return -EINVAL;
2143 } else if (in_kernel) {
2144 if (substream->ops->copy_kernel)
2145 transfer = substream->ops->copy_kernel;
2146 else
2147 transfer = is_playback ?
2148 default_write_copy_kernel : default_read_copy_kernel;
2149 } else {
2150 if (substream->ops->copy_user)
2151 transfer = (pcm_transfer_f)substream->ops->copy_user;
2152 else
2153 transfer = is_playback ?
2154 default_write_copy : default_read_copy;
2155 }
2156
2157 if (size == 0)
2158 return 0;
2159
2160 nonblock = !!(substream->f_flags & O_NONBLOCK);
2161
2162 snd_pcm_stream_lock_irq(substream);
2163 err = pcm_accessible_state(runtime);
2164 if (err < 0)
2165 goto _end_unlock;
2166
2167 if (!is_playback &&
2168 runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
2169 size >= runtime->start_threshold) {
2170 err = snd_pcm_start(substream);
2171 if (err < 0)
2172 goto _end_unlock;
2173 }
2174
2175 runtime->twake = runtime->control->avail_min ? : 1;
2176 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2177 snd_pcm_update_hw_ptr(substream);
2178 if (is_playback)
2179 avail = snd_pcm_playback_avail(runtime);
2180 else
2181 avail = snd_pcm_capture_avail(runtime);
2182 while (size > 0) {
2183 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2184 snd_pcm_uframes_t cont;
2185 if (!avail) {
2186 if (!is_playback &&
2187 runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
2188 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2189 goto _end_unlock;
2190 }
2191 if (nonblock) {
2192 err = -EAGAIN;
2193 goto _end_unlock;
2194 }
2195 runtime->twake = min_t(snd_pcm_uframes_t, size,
2196 runtime->control->avail_min ? : 1);
2197 err = wait_for_avail(substream, &avail);
2198 if (err < 0)
2199 goto _end_unlock;
2200 if (!avail)
2201 continue; /* draining */
2202 }
2203 frames = size > avail ? avail : size;
2204 appl_ptr = READ_ONCE(runtime->control->appl_ptr);
2205 appl_ofs = appl_ptr % runtime->buffer_size;
2206 cont = runtime->buffer_size - appl_ofs;
2207 if (frames > cont)
2208 frames = cont;
2209 if (snd_BUG_ON(!frames)) {
2210 runtime->twake = 0;
2211 snd_pcm_stream_unlock_irq(substream);
2212 return -EINVAL;
2213 }
2214 snd_pcm_stream_unlock_irq(substream);
2215 err = writer(substream, appl_ofs, data, offset, frames,
2216 transfer);
2217 snd_pcm_stream_lock_irq(substream);
2218 if (err < 0)
2219 goto _end_unlock;
2220 err = pcm_accessible_state(runtime);
2221 if (err < 0)
2222 goto _end_unlock;
2223 appl_ptr += frames;
2224 if (appl_ptr >= runtime->boundary)
2225 appl_ptr -= runtime->boundary;
2226 err = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2227 if (err < 0)
2228 goto _end_unlock;
2229
2230 offset += frames;
2231 size -= frames;
2232 xfer += frames;
2233 avail -= frames;
2234 if (is_playback &&
2235 runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
2236 snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
2237 err = snd_pcm_start(substream);
2238 if (err < 0)
2239 goto _end_unlock;
2240 }
2241 }
2242 _end_unlock:
2243 runtime->twake = 0;
2244 if (xfer > 0 && err >= 0)
2245 snd_pcm_update_state(substream, runtime);
2246 snd_pcm_stream_unlock_irq(substream);
2247 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2248}
2249EXPORT_SYMBOL(__snd_pcm_lib_xfer);
2250
2251/*
2252 * standard channel mapping helpers
2253 */
2254
2255/* default channel maps for multi-channel playbacks, up to 8 channels */
2256const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[] = {
2257 { .channels = 1,
2258 .map = { SNDRV_CHMAP_MONO } },
2259 { .channels = 2,
2260 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
2261 { .channels = 4,
2262 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2263 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2264 { .channels = 6,
2265 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2266 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2267 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE } },
2268 { .channels = 8,
2269 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2270 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2271 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2272 SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
2273 { }
2274};
2275EXPORT_SYMBOL_GPL(snd_pcm_std_chmaps);
2276
2277/* alternative channel maps with CLFE <-> surround swapped for 6/8 channels */
2278const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[] = {
2279 { .channels = 1,
2280 .map = { SNDRV_CHMAP_MONO } },
2281 { .channels = 2,
2282 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
2283 { .channels = 4,
2284 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2285 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2286 { .channels = 6,
2287 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2288 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2289 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2290 { .channels = 8,
2291 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2292 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2293 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2294 SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
2295 { }
2296};
2297EXPORT_SYMBOL_GPL(snd_pcm_alt_chmaps);
2298
2299static bool valid_chmap_channels(const struct snd_pcm_chmap *info, int ch)
2300{
2301 if (ch > info->max_channels)
2302 return false;
2303 return !info->channel_mask || (info->channel_mask & (1U << ch));
2304}
2305
2306static int pcm_chmap_ctl_info(struct snd_kcontrol *kcontrol,
2307 struct snd_ctl_elem_info *uinfo)
2308{
2309 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2310
2311 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
2312 uinfo->count = 0;
2313 uinfo->count = info->max_channels;
2314 uinfo->value.integer.min = 0;
2315 uinfo->value.integer.max = SNDRV_CHMAP_LAST;
2316 return 0;
2317}
2318
2319/* get callback for channel map ctl element
2320 * stores the channel position firstly matching with the current channels
2321 */
2322static int pcm_chmap_ctl_get(struct snd_kcontrol *kcontrol,
2323 struct snd_ctl_elem_value *ucontrol)
2324{
2325 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2326 unsigned int idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);
2327 struct snd_pcm_substream *substream;
2328 const struct snd_pcm_chmap_elem *map;
2329
2330 if (!info->chmap)
2331 return -EINVAL;
2332 substream = snd_pcm_chmap_substream(info, idx);
2333 if (!substream)
2334 return -ENODEV;
2335 memset(ucontrol->value.integer.value, 0,
2336 sizeof(ucontrol->value.integer.value));
2337 if (!substream->runtime)
2338 return 0; /* no channels set */
2339 for (map = info->chmap; map->channels; map++) {
2340 int i;
2341 if (map->channels == substream->runtime->channels &&
2342 valid_chmap_channels(info, map->channels)) {
2343 for (i = 0; i < map->channels; i++)
2344 ucontrol->value.integer.value[i] = map->map[i];
2345 return 0;
2346 }
2347 }
2348 return -EINVAL;
2349}
2350
2351/* tlv callback for channel map ctl element
2352 * expands the pre-defined channel maps in a form of TLV
2353 */
2354static int pcm_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
2355 unsigned int size, unsigned int __user *tlv)
2356{
2357 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2358 const struct snd_pcm_chmap_elem *map;
2359 unsigned int __user *dst;
2360 int c, count = 0;
2361
2362 if (!info->chmap)
2363 return -EINVAL;
2364 if (size < 8)
2365 return -ENOMEM;
2366 if (put_user(SNDRV_CTL_TLVT_CONTAINER, tlv))
2367 return -EFAULT;
2368 size -= 8;
2369 dst = tlv + 2;
2370 for (map = info->chmap; map->channels; map++) {
2371 int chs_bytes = map->channels * 4;
2372 if (!valid_chmap_channels(info, map->channels))
2373 continue;
2374 if (size < 8)
2375 return -ENOMEM;
2376 if (put_user(SNDRV_CTL_TLVT_CHMAP_FIXED, dst) ||
2377 put_user(chs_bytes, dst + 1))
2378 return -EFAULT;
2379 dst += 2;
2380 size -= 8;
2381 count += 8;
2382 if (size < chs_bytes)
2383 return -ENOMEM;
2384 size -= chs_bytes;
2385 count += chs_bytes;
2386 for (c = 0; c < map->channels; c++) {
2387 if (put_user(map->map[c], dst))
2388 return -EFAULT;
2389 dst++;
2390 }
2391 }
2392 if (put_user(count, tlv + 1))
2393 return -EFAULT;
2394 return 0;
2395}
2396
2397static void pcm_chmap_ctl_private_free(struct snd_kcontrol *kcontrol)
2398{
2399 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2400 info->pcm->streams[info->stream].chmap_kctl = NULL;
2401 kfree(info);
2402}
2403
2404/**
2405 * snd_pcm_add_chmap_ctls - create channel-mapping control elements
2406 * @pcm: the assigned PCM instance
2407 * @stream: stream direction
2408 * @chmap: channel map elements (for query)
2409 * @max_channels: the max number of channels for the stream
2410 * @private_value: the value passed to each kcontrol's private_value field
2411 * @info_ret: store struct snd_pcm_chmap instance if non-NULL
2412 *
2413 * Create channel-mapping control elements assigned to the given PCM stream(s).
2414 * Return: Zero if successful, or a negative error value.
2415 */
2416int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
2417 const struct snd_pcm_chmap_elem *chmap,
2418 int max_channels,
2419 unsigned long private_value,
2420 struct snd_pcm_chmap **info_ret)
2421{
2422 struct snd_pcm_chmap *info;
2423 struct snd_kcontrol_new knew = {
2424 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
2425 .access = SNDRV_CTL_ELEM_ACCESS_READ |
2426 SNDRV_CTL_ELEM_ACCESS_TLV_READ |
2427 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK,
2428 .info = pcm_chmap_ctl_info,
2429 .get = pcm_chmap_ctl_get,
2430 .tlv.c = pcm_chmap_ctl_tlv,
2431 };
2432 int err;
2433
2434 if (WARN_ON(pcm->streams[stream].chmap_kctl))
2435 return -EBUSY;
2436 info = kzalloc(sizeof(*info), GFP_KERNEL);
2437 if (!info)
2438 return -ENOMEM;
2439 info->pcm = pcm;
2440 info->stream = stream;
2441 info->chmap = chmap;
2442 info->max_channels = max_channels;
2443 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
2444 knew.name = "Playback Channel Map";
2445 else
2446 knew.name = "Capture Channel Map";
2447 knew.device = pcm->device;
2448 knew.count = pcm->streams[stream].substream_count;
2449 knew.private_value = private_value;
2450 info->kctl = snd_ctl_new1(&knew, info);
2451 if (!info->kctl) {
2452 kfree(info);
2453 return -ENOMEM;
2454 }
2455 info->kctl->private_free = pcm_chmap_ctl_private_free;
2456 err = snd_ctl_add(pcm->card, info->kctl);
2457 if (err < 0)
2458 return err;
2459 pcm->streams[stream].chmap_kctl = info->kctl;
2460 if (info_ret)
2461 *info_ret = info;
2462 return 0;
2463}
2464EXPORT_SYMBOL_GPL(snd_pcm_add_chmap_ctls);