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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Digital Audio (PCM) abstract layer
4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
5 * Abramo Bagnara <abramo@alsa-project.org>
6 */
7
8#include <linux/slab.h>
9#include <linux/sched/signal.h>
10#include <linux/time.h>
11#include <linux/math64.h>
12#include <linux/export.h>
13#include <sound/core.h>
14#include <sound/control.h>
15#include <sound/tlv.h>
16#include <sound/info.h>
17#include <sound/pcm.h>
18#include <sound/pcm_params.h>
19#include <sound/timer.h>
20
21#include "pcm_local.h"
22
23#ifdef CONFIG_SND_PCM_XRUN_DEBUG
24#define CREATE_TRACE_POINTS
25#include "pcm_trace.h"
26#else
27#define trace_hwptr(substream, pos, in_interrupt)
28#define trace_xrun(substream)
29#define trace_hw_ptr_error(substream, reason)
30#define trace_applptr(substream, prev, curr)
31#endif
32
33static int fill_silence_frames(struct snd_pcm_substream *substream,
34 snd_pcm_uframes_t off, snd_pcm_uframes_t frames);
35
36/*
37 * fill ring buffer with silence
38 * runtime->silence_start: starting pointer to silence area
39 * runtime->silence_filled: size filled with silence
40 * runtime->silence_threshold: threshold from application
41 * runtime->silence_size: maximal size from application
42 *
43 * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately
44 */
45void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr)
46{
47 struct snd_pcm_runtime *runtime = substream->runtime;
48 snd_pcm_uframes_t frames, ofs, transfer;
49 int err;
50
51 if (runtime->silence_size < runtime->boundary) {
52 snd_pcm_sframes_t noise_dist, n;
53 snd_pcm_uframes_t appl_ptr = READ_ONCE(runtime->control->appl_ptr);
54 if (runtime->silence_start != appl_ptr) {
55 n = appl_ptr - runtime->silence_start;
56 if (n < 0)
57 n += runtime->boundary;
58 if ((snd_pcm_uframes_t)n < runtime->silence_filled)
59 runtime->silence_filled -= n;
60 else
61 runtime->silence_filled = 0;
62 runtime->silence_start = appl_ptr;
63 }
64 if (runtime->silence_filled >= runtime->buffer_size)
65 return;
66 noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
67 if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold)
68 return;
69 frames = runtime->silence_threshold - noise_dist;
70 if (frames > runtime->silence_size)
71 frames = runtime->silence_size;
72 } else {
73 if (new_hw_ptr == ULONG_MAX) { /* initialization */
74 snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime);
75 if (avail > runtime->buffer_size)
76 avail = runtime->buffer_size;
77 runtime->silence_filled = avail > 0 ? avail : 0;
78 runtime->silence_start = (runtime->status->hw_ptr +
79 runtime->silence_filled) %
80 runtime->boundary;
81 } else {
82 ofs = runtime->status->hw_ptr;
83 frames = new_hw_ptr - ofs;
84 if ((snd_pcm_sframes_t)frames < 0)
85 frames += runtime->boundary;
86 runtime->silence_filled -= frames;
87 if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
88 runtime->silence_filled = 0;
89 runtime->silence_start = new_hw_ptr;
90 } else {
91 runtime->silence_start = ofs;
92 }
93 }
94 frames = runtime->buffer_size - runtime->silence_filled;
95 }
96 if (snd_BUG_ON(frames > runtime->buffer_size))
97 return;
98 if (frames == 0)
99 return;
100 ofs = runtime->silence_start % runtime->buffer_size;
101 while (frames > 0) {
102 transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
103 err = fill_silence_frames(substream, ofs, transfer);
104 snd_BUG_ON(err < 0);
105 runtime->silence_filled += transfer;
106 frames -= transfer;
107 ofs = 0;
108 }
109}
110
111#ifdef CONFIG_SND_DEBUG
112void snd_pcm_debug_name(struct snd_pcm_substream *substream,
113 char *name, size_t len)
114{
115 snprintf(name, len, "pcmC%dD%d%c:%d",
116 substream->pcm->card->number,
117 substream->pcm->device,
118 substream->stream ? 'c' : 'p',
119 substream->number);
120}
121EXPORT_SYMBOL(snd_pcm_debug_name);
122#endif
123
124#define XRUN_DEBUG_BASIC (1<<0)
125#define XRUN_DEBUG_STACK (1<<1) /* dump also stack */
126#define XRUN_DEBUG_JIFFIESCHECK (1<<2) /* do jiffies check */
127
128#ifdef CONFIG_SND_PCM_XRUN_DEBUG
129
130#define xrun_debug(substream, mask) \
131 ((substream)->pstr->xrun_debug & (mask))
132#else
133#define xrun_debug(substream, mask) 0
134#endif
135
136#define dump_stack_on_xrun(substream) do { \
137 if (xrun_debug(substream, XRUN_DEBUG_STACK)) \
138 dump_stack(); \
139 } while (0)
140
141/* call with stream lock held */
142void __snd_pcm_xrun(struct snd_pcm_substream *substream)
143{
144 struct snd_pcm_runtime *runtime = substream->runtime;
145
146 trace_xrun(substream);
147 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
148 struct timespec64 tstamp;
149
150 snd_pcm_gettime(runtime, &tstamp);
151 runtime->status->tstamp.tv_sec = tstamp.tv_sec;
152 runtime->status->tstamp.tv_nsec = tstamp.tv_nsec;
153 }
154 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
155 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {
156 char name[16];
157 snd_pcm_debug_name(substream, name, sizeof(name));
158 pcm_warn(substream->pcm, "XRUN: %s\n", name);
159 dump_stack_on_xrun(substream);
160 }
161}
162
163#ifdef CONFIG_SND_PCM_XRUN_DEBUG
164#define hw_ptr_error(substream, in_interrupt, reason, fmt, args...) \
165 do { \
166 trace_hw_ptr_error(substream, reason); \
167 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { \
168 pr_err_ratelimited("ALSA: PCM: [%c] " reason ": " fmt, \
169 (in_interrupt) ? 'Q' : 'P', ##args); \
170 dump_stack_on_xrun(substream); \
171 } \
172 } while (0)
173
174#else /* ! CONFIG_SND_PCM_XRUN_DEBUG */
175
176#define hw_ptr_error(substream, fmt, args...) do { } while (0)
177
178#endif
179
180int snd_pcm_update_state(struct snd_pcm_substream *substream,
181 struct snd_pcm_runtime *runtime)
182{
183 snd_pcm_uframes_t avail;
184
185 avail = snd_pcm_avail(substream);
186 if (avail > runtime->avail_max)
187 runtime->avail_max = avail;
188 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
189 if (avail >= runtime->buffer_size) {
190 snd_pcm_drain_done(substream);
191 return -EPIPE;
192 }
193 } else {
194 if (avail >= runtime->stop_threshold) {
195 __snd_pcm_xrun(substream);
196 return -EPIPE;
197 }
198 }
199 if (runtime->twake) {
200 if (avail >= runtime->twake)
201 wake_up(&runtime->tsleep);
202 } else if (avail >= runtime->control->avail_min)
203 wake_up(&runtime->sleep);
204 return 0;
205}
206
207static void update_audio_tstamp(struct snd_pcm_substream *substream,
208 struct timespec64 *curr_tstamp,
209 struct timespec64 *audio_tstamp)
210{
211 struct snd_pcm_runtime *runtime = substream->runtime;
212 u64 audio_frames, audio_nsecs;
213 struct timespec64 driver_tstamp;
214
215 if (runtime->tstamp_mode != SNDRV_PCM_TSTAMP_ENABLE)
216 return;
217
218 if (!(substream->ops->get_time_info) ||
219 (runtime->audio_tstamp_report.actual_type ==
220 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)) {
221
222 /*
223 * provide audio timestamp derived from pointer position
224 * add delay only if requested
225 */
226
227 audio_frames = runtime->hw_ptr_wrap + runtime->status->hw_ptr;
228
229 if (runtime->audio_tstamp_config.report_delay) {
230 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
231 audio_frames -= runtime->delay;
232 else
233 audio_frames += runtime->delay;
234 }
235 audio_nsecs = div_u64(audio_frames * 1000000000LL,
236 runtime->rate);
237 *audio_tstamp = ns_to_timespec64(audio_nsecs);
238 }
239
240 if (runtime->status->audio_tstamp.tv_sec != audio_tstamp->tv_sec ||
241 runtime->status->audio_tstamp.tv_nsec != audio_tstamp->tv_nsec) {
242 runtime->status->audio_tstamp.tv_sec = audio_tstamp->tv_sec;
243 runtime->status->audio_tstamp.tv_nsec = audio_tstamp->tv_nsec;
244 runtime->status->tstamp.tv_sec = curr_tstamp->tv_sec;
245 runtime->status->tstamp.tv_nsec = curr_tstamp->tv_nsec;
246 }
247
248
249 /*
250 * re-take a driver timestamp to let apps detect if the reference tstamp
251 * read by low-level hardware was provided with a delay
252 */
253 snd_pcm_gettime(substream->runtime, &driver_tstamp);
254 runtime->driver_tstamp = driver_tstamp;
255}
256
257static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
258 unsigned int in_interrupt)
259{
260 struct snd_pcm_runtime *runtime = substream->runtime;
261 snd_pcm_uframes_t pos;
262 snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
263 snd_pcm_sframes_t hdelta, delta;
264 unsigned long jdelta;
265 unsigned long curr_jiffies;
266 struct timespec64 curr_tstamp;
267 struct timespec64 audio_tstamp;
268 int crossed_boundary = 0;
269
270 old_hw_ptr = runtime->status->hw_ptr;
271
272 /*
273 * group pointer, time and jiffies reads to allow for more
274 * accurate correlations/corrections.
275 * The values are stored at the end of this routine after
276 * corrections for hw_ptr position
277 */
278 pos = substream->ops->pointer(substream);
279 curr_jiffies = jiffies;
280 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
281 if ((substream->ops->get_time_info) &&
282 (runtime->audio_tstamp_config.type_requested != SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)) {
283 substream->ops->get_time_info(substream, &curr_tstamp,
284 &audio_tstamp,
285 &runtime->audio_tstamp_config,
286 &runtime->audio_tstamp_report);
287
288 /* re-test in case tstamp type is not supported in hardware and was demoted to DEFAULT */
289 if (runtime->audio_tstamp_report.actual_type == SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)
290 snd_pcm_gettime(runtime, &curr_tstamp);
291 } else
292 snd_pcm_gettime(runtime, &curr_tstamp);
293 }
294
295 if (pos == SNDRV_PCM_POS_XRUN) {
296 __snd_pcm_xrun(substream);
297 return -EPIPE;
298 }
299 if (pos >= runtime->buffer_size) {
300 if (printk_ratelimit()) {
301 char name[16];
302 snd_pcm_debug_name(substream, name, sizeof(name));
303 pcm_err(substream->pcm,
304 "invalid position: %s, pos = %ld, buffer size = %ld, period size = %ld\n",
305 name, pos, runtime->buffer_size,
306 runtime->period_size);
307 }
308 pos = 0;
309 }
310 pos -= pos % runtime->min_align;
311 trace_hwptr(substream, pos, in_interrupt);
312 hw_base = runtime->hw_ptr_base;
313 new_hw_ptr = hw_base + pos;
314 if (in_interrupt) {
315 /* we know that one period was processed */
316 /* delta = "expected next hw_ptr" for in_interrupt != 0 */
317 delta = runtime->hw_ptr_interrupt + runtime->period_size;
318 if (delta > new_hw_ptr) {
319 /* check for double acknowledged interrupts */
320 hdelta = curr_jiffies - runtime->hw_ptr_jiffies;
321 if (hdelta > runtime->hw_ptr_buffer_jiffies/2 + 1) {
322 hw_base += runtime->buffer_size;
323 if (hw_base >= runtime->boundary) {
324 hw_base = 0;
325 crossed_boundary++;
326 }
327 new_hw_ptr = hw_base + pos;
328 goto __delta;
329 }
330 }
331 }
332 /* new_hw_ptr might be lower than old_hw_ptr in case when */
333 /* pointer crosses the end of the ring buffer */
334 if (new_hw_ptr < old_hw_ptr) {
335 hw_base += runtime->buffer_size;
336 if (hw_base >= runtime->boundary) {
337 hw_base = 0;
338 crossed_boundary++;
339 }
340 new_hw_ptr = hw_base + pos;
341 }
342 __delta:
343 delta = new_hw_ptr - old_hw_ptr;
344 if (delta < 0)
345 delta += runtime->boundary;
346
347 if (runtime->no_period_wakeup) {
348 snd_pcm_sframes_t xrun_threshold;
349 /*
350 * Without regular period interrupts, we have to check
351 * the elapsed time to detect xruns.
352 */
353 jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
354 if (jdelta < runtime->hw_ptr_buffer_jiffies / 2)
355 goto no_delta_check;
356 hdelta = jdelta - delta * HZ / runtime->rate;
357 xrun_threshold = runtime->hw_ptr_buffer_jiffies / 2 + 1;
358 while (hdelta > xrun_threshold) {
359 delta += runtime->buffer_size;
360 hw_base += runtime->buffer_size;
361 if (hw_base >= runtime->boundary) {
362 hw_base = 0;
363 crossed_boundary++;
364 }
365 new_hw_ptr = hw_base + pos;
366 hdelta -= runtime->hw_ptr_buffer_jiffies;
367 }
368 goto no_delta_check;
369 }
370
371 /* something must be really wrong */
372 if (delta >= runtime->buffer_size + runtime->period_size) {
373 hw_ptr_error(substream, in_interrupt, "Unexpected hw_ptr",
374 "(stream=%i, pos=%ld, new_hw_ptr=%ld, old_hw_ptr=%ld)\n",
375 substream->stream, (long)pos,
376 (long)new_hw_ptr, (long)old_hw_ptr);
377 return 0;
378 }
379
380 /* Do jiffies check only in xrun_debug mode */
381 if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
382 goto no_jiffies_check;
383
384 /* Skip the jiffies check for hardwares with BATCH flag.
385 * Such hardware usually just increases the position at each IRQ,
386 * thus it can't give any strange position.
387 */
388 if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
389 goto no_jiffies_check;
390 hdelta = delta;
391 if (hdelta < runtime->delay)
392 goto no_jiffies_check;
393 hdelta -= runtime->delay;
394 jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
395 if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
396 delta = jdelta /
397 (((runtime->period_size * HZ) / runtime->rate)
398 + HZ/100);
399 /* move new_hw_ptr according jiffies not pos variable */
400 new_hw_ptr = old_hw_ptr;
401 hw_base = delta;
402 /* use loop to avoid checks for delta overflows */
403 /* the delta value is small or zero in most cases */
404 while (delta > 0) {
405 new_hw_ptr += runtime->period_size;
406 if (new_hw_ptr >= runtime->boundary) {
407 new_hw_ptr -= runtime->boundary;
408 crossed_boundary--;
409 }
410 delta--;
411 }
412 /* align hw_base to buffer_size */
413 hw_ptr_error(substream, in_interrupt, "hw_ptr skipping",
414 "(pos=%ld, delta=%ld, period=%ld, jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
415 (long)pos, (long)hdelta,
416 (long)runtime->period_size, jdelta,
417 ((hdelta * HZ) / runtime->rate), hw_base,
418 (unsigned long)old_hw_ptr,
419 (unsigned long)new_hw_ptr);
420 /* reset values to proper state */
421 delta = 0;
422 hw_base = new_hw_ptr - (new_hw_ptr % runtime->buffer_size);
423 }
424 no_jiffies_check:
425 if (delta > runtime->period_size + runtime->period_size / 2) {
426 hw_ptr_error(substream, in_interrupt,
427 "Lost interrupts?",
428 "(stream=%i, delta=%ld, new_hw_ptr=%ld, old_hw_ptr=%ld)\n",
429 substream->stream, (long)delta,
430 (long)new_hw_ptr,
431 (long)old_hw_ptr);
432 }
433
434 no_delta_check:
435 if (runtime->status->hw_ptr == new_hw_ptr) {
436 runtime->hw_ptr_jiffies = curr_jiffies;
437 update_audio_tstamp(substream, &curr_tstamp, &audio_tstamp);
438 return 0;
439 }
440
441 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
442 runtime->silence_size > 0)
443 snd_pcm_playback_silence(substream, new_hw_ptr);
444
445 if (in_interrupt) {
446 delta = new_hw_ptr - runtime->hw_ptr_interrupt;
447 if (delta < 0)
448 delta += runtime->boundary;
449 delta -= (snd_pcm_uframes_t)delta % runtime->period_size;
450 runtime->hw_ptr_interrupt += delta;
451 if (runtime->hw_ptr_interrupt >= runtime->boundary)
452 runtime->hw_ptr_interrupt -= runtime->boundary;
453 }
454 runtime->hw_ptr_base = hw_base;
455 runtime->status->hw_ptr = new_hw_ptr;
456 runtime->hw_ptr_jiffies = curr_jiffies;
457 if (crossed_boundary) {
458 snd_BUG_ON(crossed_boundary != 1);
459 runtime->hw_ptr_wrap += runtime->boundary;
460 }
461
462 update_audio_tstamp(substream, &curr_tstamp, &audio_tstamp);
463
464 return snd_pcm_update_state(substream, runtime);
465}
466
467/* CAUTION: call it with irq disabled */
468int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
469{
470 return snd_pcm_update_hw_ptr0(substream, 0);
471}
472
473/**
474 * snd_pcm_set_ops - set the PCM operators
475 * @pcm: the pcm instance
476 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
477 * @ops: the operator table
478 *
479 * Sets the given PCM operators to the pcm instance.
480 */
481void snd_pcm_set_ops(struct snd_pcm *pcm, int direction,
482 const struct snd_pcm_ops *ops)
483{
484 struct snd_pcm_str *stream = &pcm->streams[direction];
485 struct snd_pcm_substream *substream;
486
487 for (substream = stream->substream; substream != NULL; substream = substream->next)
488 substream->ops = ops;
489}
490EXPORT_SYMBOL(snd_pcm_set_ops);
491
492/**
493 * snd_pcm_sync - set the PCM sync id
494 * @substream: the pcm substream
495 *
496 * Sets the PCM sync identifier for the card.
497 */
498void snd_pcm_set_sync(struct snd_pcm_substream *substream)
499{
500 struct snd_pcm_runtime *runtime = substream->runtime;
501
502 runtime->sync.id32[0] = substream->pcm->card->number;
503 runtime->sync.id32[1] = -1;
504 runtime->sync.id32[2] = -1;
505 runtime->sync.id32[3] = -1;
506}
507EXPORT_SYMBOL(snd_pcm_set_sync);
508
509/*
510 * Standard ioctl routine
511 */
512
513static inline unsigned int div32(unsigned int a, unsigned int b,
514 unsigned int *r)
515{
516 if (b == 0) {
517 *r = 0;
518 return UINT_MAX;
519 }
520 *r = a % b;
521 return a / b;
522}
523
524static inline unsigned int div_down(unsigned int a, unsigned int b)
525{
526 if (b == 0)
527 return UINT_MAX;
528 return a / b;
529}
530
531static inline unsigned int div_up(unsigned int a, unsigned int b)
532{
533 unsigned int r;
534 unsigned int q;
535 if (b == 0)
536 return UINT_MAX;
537 q = div32(a, b, &r);
538 if (r)
539 ++q;
540 return q;
541}
542
543static inline unsigned int mul(unsigned int a, unsigned int b)
544{
545 if (a == 0)
546 return 0;
547 if (div_down(UINT_MAX, a) < b)
548 return UINT_MAX;
549 return a * b;
550}
551
552static inline unsigned int muldiv32(unsigned int a, unsigned int b,
553 unsigned int c, unsigned int *r)
554{
555 u_int64_t n = (u_int64_t) a * b;
556 if (c == 0) {
557 *r = 0;
558 return UINT_MAX;
559 }
560 n = div_u64_rem(n, c, r);
561 if (n >= UINT_MAX) {
562 *r = 0;
563 return UINT_MAX;
564 }
565 return n;
566}
567
568/**
569 * snd_interval_refine - refine the interval value of configurator
570 * @i: the interval value to refine
571 * @v: the interval value to refer to
572 *
573 * Refines the interval value with the reference value.
574 * The interval is changed to the range satisfying both intervals.
575 * The interval status (min, max, integer, etc.) are evaluated.
576 *
577 * Return: Positive if the value is changed, zero if it's not changed, or a
578 * negative error code.
579 */
580int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
581{
582 int changed = 0;
583 if (snd_BUG_ON(snd_interval_empty(i)))
584 return -EINVAL;
585 if (i->min < v->min) {
586 i->min = v->min;
587 i->openmin = v->openmin;
588 changed = 1;
589 } else if (i->min == v->min && !i->openmin && v->openmin) {
590 i->openmin = 1;
591 changed = 1;
592 }
593 if (i->max > v->max) {
594 i->max = v->max;
595 i->openmax = v->openmax;
596 changed = 1;
597 } else if (i->max == v->max && !i->openmax && v->openmax) {
598 i->openmax = 1;
599 changed = 1;
600 }
601 if (!i->integer && v->integer) {
602 i->integer = 1;
603 changed = 1;
604 }
605 if (i->integer) {
606 if (i->openmin) {
607 i->min++;
608 i->openmin = 0;
609 }
610 if (i->openmax) {
611 i->max--;
612 i->openmax = 0;
613 }
614 } else if (!i->openmin && !i->openmax && i->min == i->max)
615 i->integer = 1;
616 if (snd_interval_checkempty(i)) {
617 snd_interval_none(i);
618 return -EINVAL;
619 }
620 return changed;
621}
622EXPORT_SYMBOL(snd_interval_refine);
623
624static int snd_interval_refine_first(struct snd_interval *i)
625{
626 const unsigned int last_max = i->max;
627
628 if (snd_BUG_ON(snd_interval_empty(i)))
629 return -EINVAL;
630 if (snd_interval_single(i))
631 return 0;
632 i->max = i->min;
633 if (i->openmin)
634 i->max++;
635 /* only exclude max value if also excluded before refine */
636 i->openmax = (i->openmax && i->max >= last_max);
637 return 1;
638}
639
640static int snd_interval_refine_last(struct snd_interval *i)
641{
642 const unsigned int last_min = i->min;
643
644 if (snd_BUG_ON(snd_interval_empty(i)))
645 return -EINVAL;
646 if (snd_interval_single(i))
647 return 0;
648 i->min = i->max;
649 if (i->openmax)
650 i->min--;
651 /* only exclude min value if also excluded before refine */
652 i->openmin = (i->openmin && i->min <= last_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 const 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 (snd_BUG_ON(!substream))
1797 return;
1798
1799 snd_pcm_stream_lock_irqsave(substream, flags);
1800 if (PCM_RUNTIME_CHECK(substream))
1801 goto _unlock;
1802 runtime = substream->runtime;
1803
1804 if (!snd_pcm_running(substream) ||
1805 snd_pcm_update_hw_ptr0(substream, 1) < 0)
1806 goto _end;
1807
1808#ifdef CONFIG_SND_PCM_TIMER
1809 if (substream->timer_running)
1810 snd_timer_interrupt(substream->timer, 1);
1811#endif
1812 _end:
1813 kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
1814 _unlock:
1815 snd_pcm_stream_unlock_irqrestore(substream, flags);
1816}
1817EXPORT_SYMBOL(snd_pcm_period_elapsed);
1818
1819/*
1820 * Wait until avail_min data becomes available
1821 * Returns a negative error code if any error occurs during operation.
1822 * The available space is stored on availp. When err = 0 and avail = 0
1823 * on the capture stream, it indicates the stream is in DRAINING state.
1824 */
1825static int wait_for_avail(struct snd_pcm_substream *substream,
1826 snd_pcm_uframes_t *availp)
1827{
1828 struct snd_pcm_runtime *runtime = substream->runtime;
1829 int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
1830 wait_queue_entry_t wait;
1831 int err = 0;
1832 snd_pcm_uframes_t avail = 0;
1833 long wait_time, tout;
1834
1835 init_waitqueue_entry(&wait, current);
1836 set_current_state(TASK_INTERRUPTIBLE);
1837 add_wait_queue(&runtime->tsleep, &wait);
1838
1839 if (runtime->no_period_wakeup)
1840 wait_time = MAX_SCHEDULE_TIMEOUT;
1841 else {
1842 /* use wait time from substream if available */
1843 if (substream->wait_time) {
1844 wait_time = substream->wait_time;
1845 } else {
1846 wait_time = 10;
1847
1848 if (runtime->rate) {
1849 long t = runtime->period_size * 2 /
1850 runtime->rate;
1851 wait_time = max(t, wait_time);
1852 }
1853 wait_time = msecs_to_jiffies(wait_time * 1000);
1854 }
1855 }
1856
1857 for (;;) {
1858 if (signal_pending(current)) {
1859 err = -ERESTARTSYS;
1860 break;
1861 }
1862
1863 /*
1864 * We need to check if space became available already
1865 * (and thus the wakeup happened already) first to close
1866 * the race of space already having become available.
1867 * This check must happen after been added to the waitqueue
1868 * and having current state be INTERRUPTIBLE.
1869 */
1870 avail = snd_pcm_avail(substream);
1871 if (avail >= runtime->twake)
1872 break;
1873 snd_pcm_stream_unlock_irq(substream);
1874
1875 tout = schedule_timeout(wait_time);
1876
1877 snd_pcm_stream_lock_irq(substream);
1878 set_current_state(TASK_INTERRUPTIBLE);
1879 switch (runtime->status->state) {
1880 case SNDRV_PCM_STATE_SUSPENDED:
1881 err = -ESTRPIPE;
1882 goto _endloop;
1883 case SNDRV_PCM_STATE_XRUN:
1884 err = -EPIPE;
1885 goto _endloop;
1886 case SNDRV_PCM_STATE_DRAINING:
1887 if (is_playback)
1888 err = -EPIPE;
1889 else
1890 avail = 0; /* indicate draining */
1891 goto _endloop;
1892 case SNDRV_PCM_STATE_OPEN:
1893 case SNDRV_PCM_STATE_SETUP:
1894 case SNDRV_PCM_STATE_DISCONNECTED:
1895 err = -EBADFD;
1896 goto _endloop;
1897 case SNDRV_PCM_STATE_PAUSED:
1898 continue;
1899 }
1900 if (!tout) {
1901 pcm_dbg(substream->pcm,
1902 "%s write error (DMA or IRQ trouble?)\n",
1903 is_playback ? "playback" : "capture");
1904 err = -EIO;
1905 break;
1906 }
1907 }
1908 _endloop:
1909 set_current_state(TASK_RUNNING);
1910 remove_wait_queue(&runtime->tsleep, &wait);
1911 *availp = avail;
1912 return err;
1913}
1914
1915typedef int (*pcm_transfer_f)(struct snd_pcm_substream *substream,
1916 int channel, unsigned long hwoff,
1917 void *buf, unsigned long bytes);
1918
1919typedef int (*pcm_copy_f)(struct snd_pcm_substream *, snd_pcm_uframes_t, void *,
1920 snd_pcm_uframes_t, snd_pcm_uframes_t, pcm_transfer_f);
1921
1922/* calculate the target DMA-buffer position to be written/read */
1923static void *get_dma_ptr(struct snd_pcm_runtime *runtime,
1924 int channel, unsigned long hwoff)
1925{
1926 return runtime->dma_area + hwoff +
1927 channel * (runtime->dma_bytes / runtime->channels);
1928}
1929
1930/* default copy_user ops for write; used for both interleaved and non- modes */
1931static int default_write_copy(struct snd_pcm_substream *substream,
1932 int channel, unsigned long hwoff,
1933 void *buf, unsigned long bytes)
1934{
1935 if (copy_from_user(get_dma_ptr(substream->runtime, channel, hwoff),
1936 (void __user *)buf, bytes))
1937 return -EFAULT;
1938 return 0;
1939}
1940
1941/* default copy_kernel ops for write */
1942static int default_write_copy_kernel(struct snd_pcm_substream *substream,
1943 int channel, unsigned long hwoff,
1944 void *buf, unsigned long bytes)
1945{
1946 memcpy(get_dma_ptr(substream->runtime, channel, hwoff), buf, bytes);
1947 return 0;
1948}
1949
1950/* fill silence instead of copy data; called as a transfer helper
1951 * from __snd_pcm_lib_write() or directly from noninterleaved_copy() when
1952 * a NULL buffer is passed
1953 */
1954static int fill_silence(struct snd_pcm_substream *substream, int channel,
1955 unsigned long hwoff, void *buf, unsigned long bytes)
1956{
1957 struct snd_pcm_runtime *runtime = substream->runtime;
1958
1959 if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
1960 return 0;
1961 if (substream->ops->fill_silence)
1962 return substream->ops->fill_silence(substream, channel,
1963 hwoff, bytes);
1964
1965 snd_pcm_format_set_silence(runtime->format,
1966 get_dma_ptr(runtime, channel, hwoff),
1967 bytes_to_samples(runtime, bytes));
1968 return 0;
1969}
1970
1971/* default copy_user ops for read; used for both interleaved and non- modes */
1972static int default_read_copy(struct snd_pcm_substream *substream,
1973 int channel, unsigned long hwoff,
1974 void *buf, unsigned long bytes)
1975{
1976 if (copy_to_user((void __user *)buf,
1977 get_dma_ptr(substream->runtime, channel, hwoff),
1978 bytes))
1979 return -EFAULT;
1980 return 0;
1981}
1982
1983/* default copy_kernel ops for read */
1984static int default_read_copy_kernel(struct snd_pcm_substream *substream,
1985 int channel, unsigned long hwoff,
1986 void *buf, unsigned long bytes)
1987{
1988 memcpy(buf, get_dma_ptr(substream->runtime, channel, hwoff), bytes);
1989 return 0;
1990}
1991
1992/* call transfer function with the converted pointers and sizes;
1993 * for interleaved mode, it's one shot for all samples
1994 */
1995static int interleaved_copy(struct snd_pcm_substream *substream,
1996 snd_pcm_uframes_t hwoff, void *data,
1997 snd_pcm_uframes_t off,
1998 snd_pcm_uframes_t frames,
1999 pcm_transfer_f transfer)
2000{
2001 struct snd_pcm_runtime *runtime = substream->runtime;
2002
2003 /* convert to bytes */
2004 hwoff = frames_to_bytes(runtime, hwoff);
2005 off = frames_to_bytes(runtime, off);
2006 frames = frames_to_bytes(runtime, frames);
2007 return transfer(substream, 0, hwoff, data + off, frames);
2008}
2009
2010/* call transfer function with the converted pointers and sizes for each
2011 * non-interleaved channel; when buffer is NULL, silencing instead of copying
2012 */
2013static int noninterleaved_copy(struct snd_pcm_substream *substream,
2014 snd_pcm_uframes_t hwoff, void *data,
2015 snd_pcm_uframes_t off,
2016 snd_pcm_uframes_t frames,
2017 pcm_transfer_f transfer)
2018{
2019 struct snd_pcm_runtime *runtime = substream->runtime;
2020 int channels = runtime->channels;
2021 void **bufs = data;
2022 int c, err;
2023
2024 /* convert to bytes; note that it's not frames_to_bytes() here.
2025 * in non-interleaved mode, we copy for each channel, thus
2026 * each copy is n_samples bytes x channels = whole frames.
2027 */
2028 off = samples_to_bytes(runtime, off);
2029 frames = samples_to_bytes(runtime, frames);
2030 hwoff = samples_to_bytes(runtime, hwoff);
2031 for (c = 0; c < channels; ++c, ++bufs) {
2032 if (!data || !*bufs)
2033 err = fill_silence(substream, c, hwoff, NULL, frames);
2034 else
2035 err = transfer(substream, c, hwoff, *bufs + off,
2036 frames);
2037 if (err < 0)
2038 return err;
2039 }
2040 return 0;
2041}
2042
2043/* fill silence on the given buffer position;
2044 * called from snd_pcm_playback_silence()
2045 */
2046static int fill_silence_frames(struct snd_pcm_substream *substream,
2047 snd_pcm_uframes_t off, snd_pcm_uframes_t frames)
2048{
2049 if (substream->runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
2050 substream->runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED)
2051 return interleaved_copy(substream, off, NULL, 0, frames,
2052 fill_silence);
2053 else
2054 return noninterleaved_copy(substream, off, NULL, 0, frames,
2055 fill_silence);
2056}
2057
2058/* sanity-check for read/write methods */
2059static int pcm_sanity_check(struct snd_pcm_substream *substream)
2060{
2061 struct snd_pcm_runtime *runtime;
2062 if (PCM_RUNTIME_CHECK(substream))
2063 return -ENXIO;
2064 runtime = substream->runtime;
2065 if (snd_BUG_ON(!substream->ops->copy_user && !runtime->dma_area))
2066 return -EINVAL;
2067 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2068 return -EBADFD;
2069 return 0;
2070}
2071
2072static int pcm_accessible_state(struct snd_pcm_runtime *runtime)
2073{
2074 switch (runtime->status->state) {
2075 case SNDRV_PCM_STATE_PREPARED:
2076 case SNDRV_PCM_STATE_RUNNING:
2077 case SNDRV_PCM_STATE_PAUSED:
2078 return 0;
2079 case SNDRV_PCM_STATE_XRUN:
2080 return -EPIPE;
2081 case SNDRV_PCM_STATE_SUSPENDED:
2082 return -ESTRPIPE;
2083 default:
2084 return -EBADFD;
2085 }
2086}
2087
2088/* update to the given appl_ptr and call ack callback if needed;
2089 * when an error is returned, take back to the original value
2090 */
2091int pcm_lib_apply_appl_ptr(struct snd_pcm_substream *substream,
2092 snd_pcm_uframes_t appl_ptr)
2093{
2094 struct snd_pcm_runtime *runtime = substream->runtime;
2095 snd_pcm_uframes_t old_appl_ptr = runtime->control->appl_ptr;
2096 int ret;
2097
2098 if (old_appl_ptr == appl_ptr)
2099 return 0;
2100
2101 runtime->control->appl_ptr = appl_ptr;
2102 if (substream->ops->ack) {
2103 ret = substream->ops->ack(substream);
2104 if (ret < 0) {
2105 runtime->control->appl_ptr = old_appl_ptr;
2106 return ret;
2107 }
2108 }
2109
2110 trace_applptr(substream, old_appl_ptr, appl_ptr);
2111
2112 return 0;
2113}
2114
2115/* the common loop for read/write data */
2116snd_pcm_sframes_t __snd_pcm_lib_xfer(struct snd_pcm_substream *substream,
2117 void *data, bool interleaved,
2118 snd_pcm_uframes_t size, bool in_kernel)
2119{
2120 struct snd_pcm_runtime *runtime = substream->runtime;
2121 snd_pcm_uframes_t xfer = 0;
2122 snd_pcm_uframes_t offset = 0;
2123 snd_pcm_uframes_t avail;
2124 pcm_copy_f writer;
2125 pcm_transfer_f transfer;
2126 bool nonblock;
2127 bool is_playback;
2128 int err;
2129
2130 err = pcm_sanity_check(substream);
2131 if (err < 0)
2132 return err;
2133
2134 is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
2135 if (interleaved) {
2136 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
2137 runtime->channels > 1)
2138 return -EINVAL;
2139 writer = interleaved_copy;
2140 } else {
2141 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2142 return -EINVAL;
2143 writer = noninterleaved_copy;
2144 }
2145
2146 if (!data) {
2147 if (is_playback)
2148 transfer = fill_silence;
2149 else
2150 return -EINVAL;
2151 } else if (in_kernel) {
2152 if (substream->ops->copy_kernel)
2153 transfer = substream->ops->copy_kernel;
2154 else
2155 transfer = is_playback ?
2156 default_write_copy_kernel : default_read_copy_kernel;
2157 } else {
2158 if (substream->ops->copy_user)
2159 transfer = (pcm_transfer_f)substream->ops->copy_user;
2160 else
2161 transfer = is_playback ?
2162 default_write_copy : default_read_copy;
2163 }
2164
2165 if (size == 0)
2166 return 0;
2167
2168 nonblock = !!(substream->f_flags & O_NONBLOCK);
2169
2170 snd_pcm_stream_lock_irq(substream);
2171 err = pcm_accessible_state(runtime);
2172 if (err < 0)
2173 goto _end_unlock;
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
2179 /*
2180 * If size < start_threshold, wait indefinitely. Another
2181 * thread may start capture
2182 */
2183 if (!is_playback &&
2184 runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
2185 size >= runtime->start_threshold) {
2186 err = snd_pcm_start(substream);
2187 if (err < 0)
2188 goto _end_unlock;
2189 }
2190
2191 avail = snd_pcm_avail(substream);
2192
2193 while (size > 0) {
2194 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2195 snd_pcm_uframes_t cont;
2196 if (!avail) {
2197 if (!is_playback &&
2198 runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
2199 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2200 goto _end_unlock;
2201 }
2202 if (nonblock) {
2203 err = -EAGAIN;
2204 goto _end_unlock;
2205 }
2206 runtime->twake = min_t(snd_pcm_uframes_t, size,
2207 runtime->control->avail_min ? : 1);
2208 err = wait_for_avail(substream, &avail);
2209 if (err < 0)
2210 goto _end_unlock;
2211 if (!avail)
2212 continue; /* draining */
2213 }
2214 frames = size > avail ? avail : size;
2215 appl_ptr = READ_ONCE(runtime->control->appl_ptr);
2216 appl_ofs = appl_ptr % runtime->buffer_size;
2217 cont = runtime->buffer_size - appl_ofs;
2218 if (frames > cont)
2219 frames = cont;
2220 if (snd_BUG_ON(!frames)) {
2221 err = -EINVAL;
2222 goto _end_unlock;
2223 }
2224 snd_pcm_stream_unlock_irq(substream);
2225 err = writer(substream, appl_ofs, data, offset, frames,
2226 transfer);
2227 snd_pcm_stream_lock_irq(substream);
2228 if (err < 0)
2229 goto _end_unlock;
2230 err = pcm_accessible_state(runtime);
2231 if (err < 0)
2232 goto _end_unlock;
2233 appl_ptr += frames;
2234 if (appl_ptr >= runtime->boundary)
2235 appl_ptr -= runtime->boundary;
2236 err = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2237 if (err < 0)
2238 goto _end_unlock;
2239
2240 offset += frames;
2241 size -= frames;
2242 xfer += frames;
2243 avail -= frames;
2244 if (is_playback &&
2245 runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
2246 snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
2247 err = snd_pcm_start(substream);
2248 if (err < 0)
2249 goto _end_unlock;
2250 }
2251 }
2252 _end_unlock:
2253 runtime->twake = 0;
2254 if (xfer > 0 && err >= 0)
2255 snd_pcm_update_state(substream, runtime);
2256 snd_pcm_stream_unlock_irq(substream);
2257 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2258}
2259EXPORT_SYMBOL(__snd_pcm_lib_xfer);
2260
2261/*
2262 * standard channel mapping helpers
2263 */
2264
2265/* default channel maps for multi-channel playbacks, up to 8 channels */
2266const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[] = {
2267 { .channels = 1,
2268 .map = { SNDRV_CHMAP_MONO } },
2269 { .channels = 2,
2270 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
2271 { .channels = 4,
2272 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2273 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2274 { .channels = 6,
2275 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2276 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2277 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE } },
2278 { .channels = 8,
2279 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2280 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2281 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2282 SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
2283 { }
2284};
2285EXPORT_SYMBOL_GPL(snd_pcm_std_chmaps);
2286
2287/* alternative channel maps with CLFE <-> surround swapped for 6/8 channels */
2288const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[] = {
2289 { .channels = 1,
2290 .map = { SNDRV_CHMAP_MONO } },
2291 { .channels = 2,
2292 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
2293 { .channels = 4,
2294 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2295 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2296 { .channels = 6,
2297 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2298 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2299 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2300 { .channels = 8,
2301 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2302 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2303 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2304 SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
2305 { }
2306};
2307EXPORT_SYMBOL_GPL(snd_pcm_alt_chmaps);
2308
2309static bool valid_chmap_channels(const struct snd_pcm_chmap *info, int ch)
2310{
2311 if (ch > info->max_channels)
2312 return false;
2313 return !info->channel_mask || (info->channel_mask & (1U << ch));
2314}
2315
2316static int pcm_chmap_ctl_info(struct snd_kcontrol *kcontrol,
2317 struct snd_ctl_elem_info *uinfo)
2318{
2319 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2320
2321 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
2322 uinfo->count = info->max_channels;
2323 uinfo->value.integer.min = 0;
2324 uinfo->value.integer.max = SNDRV_CHMAP_LAST;
2325 return 0;
2326}
2327
2328/* get callback for channel map ctl element
2329 * stores the channel position firstly matching with the current channels
2330 */
2331static int pcm_chmap_ctl_get(struct snd_kcontrol *kcontrol,
2332 struct snd_ctl_elem_value *ucontrol)
2333{
2334 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2335 unsigned int idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);
2336 struct snd_pcm_substream *substream;
2337 const struct snd_pcm_chmap_elem *map;
2338
2339 if (!info->chmap)
2340 return -EINVAL;
2341 substream = snd_pcm_chmap_substream(info, idx);
2342 if (!substream)
2343 return -ENODEV;
2344 memset(ucontrol->value.integer.value, 0,
2345 sizeof(long) * info->max_channels);
2346 if (!substream->runtime)
2347 return 0; /* no channels set */
2348 for (map = info->chmap; map->channels; map++) {
2349 int i;
2350 if (map->channels == substream->runtime->channels &&
2351 valid_chmap_channels(info, map->channels)) {
2352 for (i = 0; i < map->channels; i++)
2353 ucontrol->value.integer.value[i] = map->map[i];
2354 return 0;
2355 }
2356 }
2357 return -EINVAL;
2358}
2359
2360/* tlv callback for channel map ctl element
2361 * expands the pre-defined channel maps in a form of TLV
2362 */
2363static int pcm_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
2364 unsigned int size, unsigned int __user *tlv)
2365{
2366 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2367 const struct snd_pcm_chmap_elem *map;
2368 unsigned int __user *dst;
2369 int c, count = 0;
2370
2371 if (!info->chmap)
2372 return -EINVAL;
2373 if (size < 8)
2374 return -ENOMEM;
2375 if (put_user(SNDRV_CTL_TLVT_CONTAINER, tlv))
2376 return -EFAULT;
2377 size -= 8;
2378 dst = tlv + 2;
2379 for (map = info->chmap; map->channels; map++) {
2380 int chs_bytes = map->channels * 4;
2381 if (!valid_chmap_channels(info, map->channels))
2382 continue;
2383 if (size < 8)
2384 return -ENOMEM;
2385 if (put_user(SNDRV_CTL_TLVT_CHMAP_FIXED, dst) ||
2386 put_user(chs_bytes, dst + 1))
2387 return -EFAULT;
2388 dst += 2;
2389 size -= 8;
2390 count += 8;
2391 if (size < chs_bytes)
2392 return -ENOMEM;
2393 size -= chs_bytes;
2394 count += chs_bytes;
2395 for (c = 0; c < map->channels; c++) {
2396 if (put_user(map->map[c], dst))
2397 return -EFAULT;
2398 dst++;
2399 }
2400 }
2401 if (put_user(count, tlv + 1))
2402 return -EFAULT;
2403 return 0;
2404}
2405
2406static void pcm_chmap_ctl_private_free(struct snd_kcontrol *kcontrol)
2407{
2408 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2409 info->pcm->streams[info->stream].chmap_kctl = NULL;
2410 kfree(info);
2411}
2412
2413/**
2414 * snd_pcm_add_chmap_ctls - create channel-mapping control elements
2415 * @pcm: the assigned PCM instance
2416 * @stream: stream direction
2417 * @chmap: channel map elements (for query)
2418 * @max_channels: the max number of channels for the stream
2419 * @private_value: the value passed to each kcontrol's private_value field
2420 * @info_ret: store struct snd_pcm_chmap instance if non-NULL
2421 *
2422 * Create channel-mapping control elements assigned to the given PCM stream(s).
2423 * Return: Zero if successful, or a negative error value.
2424 */
2425int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
2426 const struct snd_pcm_chmap_elem *chmap,
2427 int max_channels,
2428 unsigned long private_value,
2429 struct snd_pcm_chmap **info_ret)
2430{
2431 struct snd_pcm_chmap *info;
2432 struct snd_kcontrol_new knew = {
2433 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
2434 .access = SNDRV_CTL_ELEM_ACCESS_READ |
2435 SNDRV_CTL_ELEM_ACCESS_TLV_READ |
2436 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK,
2437 .info = pcm_chmap_ctl_info,
2438 .get = pcm_chmap_ctl_get,
2439 .tlv.c = pcm_chmap_ctl_tlv,
2440 };
2441 int err;
2442
2443 if (WARN_ON(pcm->streams[stream].chmap_kctl))
2444 return -EBUSY;
2445 info = kzalloc(sizeof(*info), GFP_KERNEL);
2446 if (!info)
2447 return -ENOMEM;
2448 info->pcm = pcm;
2449 info->stream = stream;
2450 info->chmap = chmap;
2451 info->max_channels = max_channels;
2452 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
2453 knew.name = "Playback Channel Map";
2454 else
2455 knew.name = "Capture Channel Map";
2456 knew.device = pcm->device;
2457 knew.count = pcm->streams[stream].substream_count;
2458 knew.private_value = private_value;
2459 info->kctl = snd_ctl_new1(&knew, info);
2460 if (!info->kctl) {
2461 kfree(info);
2462 return -ENOMEM;
2463 }
2464 info->kctl->private_free = pcm_chmap_ctl_private_free;
2465 err = snd_ctl_add(pcm->card, info->kctl);
2466 if (err < 0)
2467 return err;
2468 pcm->streams[stream].chmap_kctl = info->kctl;
2469 if (info_ret)
2470 *info_ret = info;
2471 return 0;
2472}
2473EXPORT_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/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/*
36 * fill ring buffer with silence
37 * runtime->silence_start: starting pointer to silence area
38 * runtime->silence_filled: size filled with silence
39 * runtime->silence_threshold: threshold from application
40 * runtime->silence_size: maximal size from application
41 *
42 * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately
43 */
44void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr)
45{
46 struct snd_pcm_runtime *runtime = substream->runtime;
47 snd_pcm_uframes_t frames, ofs, transfer;
48
49 if (runtime->silence_size < runtime->boundary) {
50 snd_pcm_sframes_t noise_dist, n;
51 if (runtime->silence_start != runtime->control->appl_ptr) {
52 n = runtime->control->appl_ptr - runtime->silence_start;
53 if (n < 0)
54 n += runtime->boundary;
55 if ((snd_pcm_uframes_t)n < runtime->silence_filled)
56 runtime->silence_filled -= n;
57 else
58 runtime->silence_filled = 0;
59 runtime->silence_start = runtime->control->appl_ptr;
60 }
61 if (runtime->silence_filled >= runtime->buffer_size)
62 return;
63 noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
64 if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold)
65 return;
66 frames = runtime->silence_threshold - noise_dist;
67 if (frames > runtime->silence_size)
68 frames = runtime->silence_size;
69 } else {
70 if (new_hw_ptr == ULONG_MAX) { /* initialization */
71 snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime);
72 if (avail > runtime->buffer_size)
73 avail = runtime->buffer_size;
74 runtime->silence_filled = avail > 0 ? avail : 0;
75 runtime->silence_start = (runtime->status->hw_ptr +
76 runtime->silence_filled) %
77 runtime->boundary;
78 } else {
79 ofs = runtime->status->hw_ptr;
80 frames = new_hw_ptr - ofs;
81 if ((snd_pcm_sframes_t)frames < 0)
82 frames += runtime->boundary;
83 runtime->silence_filled -= frames;
84 if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
85 runtime->silence_filled = 0;
86 runtime->silence_start = new_hw_ptr;
87 } else {
88 runtime->silence_start = ofs;
89 }
90 }
91 frames = runtime->buffer_size - runtime->silence_filled;
92 }
93 if (snd_BUG_ON(frames > runtime->buffer_size))
94 return;
95 if (frames == 0)
96 return;
97 ofs = runtime->silence_start % runtime->buffer_size;
98 while (frames > 0) {
99 transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
100 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
101 runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) {
102 if (substream->ops->silence) {
103 int err;
104 err = substream->ops->silence(substream, -1, ofs, transfer);
105 snd_BUG_ON(err < 0);
106 } else {
107 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs);
108 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels);
109 }
110 } else {
111 unsigned int c;
112 unsigned int channels = runtime->channels;
113 if (substream->ops->silence) {
114 for (c = 0; c < channels; ++c) {
115 int err;
116 err = substream->ops->silence(substream, c, ofs, transfer);
117 snd_BUG_ON(err < 0);
118 }
119 } else {
120 size_t dma_csize = runtime->dma_bytes / channels;
121 for (c = 0; c < channels; ++c) {
122 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs);
123 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer);
124 }
125 }
126 }
127 runtime->silence_filled += transfer;
128 frames -= transfer;
129 ofs = 0;
130 }
131}
132
133#ifdef CONFIG_SND_DEBUG
134void snd_pcm_debug_name(struct snd_pcm_substream *substream,
135 char *name, size_t len)
136{
137 snprintf(name, len, "pcmC%dD%d%c:%d",
138 substream->pcm->card->number,
139 substream->pcm->device,
140 substream->stream ? 'c' : 'p',
141 substream->number);
142}
143EXPORT_SYMBOL(snd_pcm_debug_name);
144#endif
145
146#define XRUN_DEBUG_BASIC (1<<0)
147#define XRUN_DEBUG_STACK (1<<1) /* dump also stack */
148#define XRUN_DEBUG_JIFFIESCHECK (1<<2) /* do jiffies check */
149#define XRUN_DEBUG_PERIODUPDATE (1<<3) /* full period update info */
150#define XRUN_DEBUG_HWPTRUPDATE (1<<4) /* full hwptr update info */
151#define XRUN_DEBUG_LOG (1<<5) /* show last 10 positions on err */
152#define XRUN_DEBUG_LOGONCE (1<<6) /* do above only once */
153
154#ifdef CONFIG_SND_PCM_XRUN_DEBUG
155
156#define xrun_debug(substream, mask) \
157 ((substream)->pstr->xrun_debug & (mask))
158#else
159#define xrun_debug(substream, mask) 0
160#endif
161
162#define dump_stack_on_xrun(substream) do { \
163 if (xrun_debug(substream, XRUN_DEBUG_STACK)) \
164 dump_stack(); \
165 } while (0)
166
167static void xrun(struct snd_pcm_substream *substream)
168{
169 struct snd_pcm_runtime *runtime = substream->runtime;
170
171 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
172 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
173 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
174 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {
175 char name[16];
176 snd_pcm_debug_name(substream, name, sizeof(name));
177 pcm_warn(substream->pcm, "XRUN: %s\n", name);
178 dump_stack_on_xrun(substream);
179 }
180}
181
182#ifdef CONFIG_SND_PCM_XRUN_DEBUG
183#define hw_ptr_error(substream, fmt, args...) \
184 do { \
185 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { \
186 xrun_log_show(substream); \
187 pr_err_ratelimited("ALSA: PCM: " fmt, ##args); \
188 dump_stack_on_xrun(substream); \
189 } \
190 } while (0)
191
192#define XRUN_LOG_CNT 10
193
194struct hwptr_log_entry {
195 unsigned int in_interrupt;
196 unsigned long jiffies;
197 snd_pcm_uframes_t pos;
198 snd_pcm_uframes_t period_size;
199 snd_pcm_uframes_t buffer_size;
200 snd_pcm_uframes_t old_hw_ptr;
201 snd_pcm_uframes_t hw_ptr_base;
202};
203
204struct snd_pcm_hwptr_log {
205 unsigned int idx;
206 unsigned int hit: 1;
207 struct hwptr_log_entry entries[XRUN_LOG_CNT];
208};
209
210static void xrun_log(struct snd_pcm_substream *substream,
211 snd_pcm_uframes_t pos, int in_interrupt)
212{
213 struct snd_pcm_runtime *runtime = substream->runtime;
214 struct snd_pcm_hwptr_log *log = runtime->hwptr_log;
215 struct hwptr_log_entry *entry;
216
217 if (log == NULL) {
218 log = kzalloc(sizeof(*log), GFP_ATOMIC);
219 if (log == NULL)
220 return;
221 runtime->hwptr_log = log;
222 } else {
223 if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
224 return;
225 }
226 entry = &log->entries[log->idx];
227 entry->in_interrupt = in_interrupt;
228 entry->jiffies = jiffies;
229 entry->pos = pos;
230 entry->period_size = runtime->period_size;
231 entry->buffer_size = runtime->buffer_size;
232 entry->old_hw_ptr = runtime->status->hw_ptr;
233 entry->hw_ptr_base = runtime->hw_ptr_base;
234 log->idx = (log->idx + 1) % XRUN_LOG_CNT;
235}
236
237static void xrun_log_show(struct snd_pcm_substream *substream)
238{
239 struct snd_pcm_hwptr_log *log = substream->runtime->hwptr_log;
240 struct hwptr_log_entry *entry;
241 char name[16];
242 unsigned int idx;
243 int cnt;
244
245 if (log == NULL)
246 return;
247 if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
248 return;
249 snd_pcm_debug_name(substream, name, sizeof(name));
250 for (cnt = 0, idx = log->idx; cnt < XRUN_LOG_CNT; cnt++) {
251 entry = &log->entries[idx];
252 if (entry->period_size == 0)
253 break;
254 pr_info("hwptr log: %s: %sj=%lu, pos=%ld/%ld/%ld, "
255 "hwptr=%ld/%ld\n",
256 name, entry->in_interrupt ? "[Q] " : "",
257 entry->jiffies,
258 (unsigned long)entry->pos,
259 (unsigned long)entry->period_size,
260 (unsigned long)entry->buffer_size,
261 (unsigned long)entry->old_hw_ptr,
262 (unsigned long)entry->hw_ptr_base);
263 idx++;
264 idx %= XRUN_LOG_CNT;
265 }
266 log->hit = 1;
267}
268
269#else /* ! CONFIG_SND_PCM_XRUN_DEBUG */
270
271#define hw_ptr_error(substream, fmt, args...) do { } while (0)
272#define xrun_log(substream, pos, in_interrupt) do { } while (0)
273#define xrun_log_show(substream) do { } while (0)
274
275#endif
276
277int snd_pcm_update_state(struct snd_pcm_substream *substream,
278 struct snd_pcm_runtime *runtime)
279{
280 snd_pcm_uframes_t avail;
281
282 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
283 avail = snd_pcm_playback_avail(runtime);
284 else
285 avail = snd_pcm_capture_avail(runtime);
286 if (avail > runtime->avail_max)
287 runtime->avail_max = avail;
288 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
289 if (avail >= runtime->buffer_size) {
290 snd_pcm_drain_done(substream);
291 return -EPIPE;
292 }
293 } else {
294 if (avail >= runtime->stop_threshold) {
295 xrun(substream);
296 return -EPIPE;
297 }
298 }
299 if (runtime->twake) {
300 if (avail >= runtime->twake)
301 wake_up(&runtime->tsleep);
302 } else if (avail >= runtime->control->avail_min)
303 wake_up(&runtime->sleep);
304 return 0;
305}
306
307static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
308 unsigned int in_interrupt)
309{
310 struct snd_pcm_runtime *runtime = substream->runtime;
311 snd_pcm_uframes_t pos;
312 snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
313 snd_pcm_sframes_t hdelta, delta;
314 unsigned long jdelta;
315 unsigned long curr_jiffies;
316 struct timespec curr_tstamp;
317 struct timespec audio_tstamp;
318 int crossed_boundary = 0;
319
320 old_hw_ptr = runtime->status->hw_ptr;
321
322 /*
323 * group pointer, time and jiffies reads to allow for more
324 * accurate correlations/corrections.
325 * The values are stored at the end of this routine after
326 * corrections for hw_ptr position
327 */
328 pos = substream->ops->pointer(substream);
329 curr_jiffies = jiffies;
330 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
331 snd_pcm_gettime(runtime, (struct timespec *)&curr_tstamp);
332
333 if ((runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK) &&
334 (substream->ops->wall_clock))
335 substream->ops->wall_clock(substream, &audio_tstamp);
336 }
337
338 if (pos == SNDRV_PCM_POS_XRUN) {
339 xrun(substream);
340 return -EPIPE;
341 }
342 if (pos >= runtime->buffer_size) {
343 if (printk_ratelimit()) {
344 char name[16];
345 snd_pcm_debug_name(substream, name, sizeof(name));
346 xrun_log_show(substream);
347 pcm_err(substream->pcm,
348 "BUG: %s, pos = %ld, buffer size = %ld, period size = %ld\n",
349 name, pos, runtime->buffer_size,
350 runtime->period_size);
351 }
352 pos = 0;
353 }
354 pos -= pos % runtime->min_align;
355 if (xrun_debug(substream, XRUN_DEBUG_LOG))
356 xrun_log(substream, pos, in_interrupt);
357 hw_base = runtime->hw_ptr_base;
358 new_hw_ptr = hw_base + pos;
359 if (in_interrupt) {
360 /* we know that one period was processed */
361 /* delta = "expected next hw_ptr" for in_interrupt != 0 */
362 delta = runtime->hw_ptr_interrupt + runtime->period_size;
363 if (delta > new_hw_ptr) {
364 /* check for double acknowledged interrupts */
365 hdelta = curr_jiffies - runtime->hw_ptr_jiffies;
366 if (hdelta > runtime->hw_ptr_buffer_jiffies/2) {
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 goto __delta;
374 }
375 }
376 }
377 /* new_hw_ptr might be lower than old_hw_ptr in case when */
378 /* pointer crosses the end of the ring buffer */
379 if (new_hw_ptr < old_hw_ptr) {
380 hw_base += runtime->buffer_size;
381 if (hw_base >= runtime->boundary) {
382 hw_base = 0;
383 crossed_boundary++;
384 }
385 new_hw_ptr = hw_base + pos;
386 }
387 __delta:
388 delta = new_hw_ptr - old_hw_ptr;
389 if (delta < 0)
390 delta += runtime->boundary;
391 if (xrun_debug(substream, in_interrupt ?
392 XRUN_DEBUG_PERIODUPDATE : XRUN_DEBUG_HWPTRUPDATE)) {
393 char name[16];
394 snd_pcm_debug_name(substream, name, sizeof(name));
395 pcm_dbg(substream->pcm,
396 "%s_update: %s: pos=%u/%u/%u, hwptr=%ld/%ld/%ld/%ld\n",
397 in_interrupt ? "period" : "hwptr",
398 name,
399 (unsigned int)pos,
400 (unsigned int)runtime->period_size,
401 (unsigned int)runtime->buffer_size,
402 (unsigned long)delta,
403 (unsigned long)old_hw_ptr,
404 (unsigned long)new_hw_ptr,
405 (unsigned long)runtime->hw_ptr_base);
406 }
407
408 if (runtime->no_period_wakeup) {
409 snd_pcm_sframes_t xrun_threshold;
410 /*
411 * Without regular period interrupts, we have to check
412 * the elapsed time to detect xruns.
413 */
414 jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
415 if (jdelta < runtime->hw_ptr_buffer_jiffies / 2)
416 goto no_delta_check;
417 hdelta = jdelta - delta * HZ / runtime->rate;
418 xrun_threshold = runtime->hw_ptr_buffer_jiffies / 2 + 1;
419 while (hdelta > xrun_threshold) {
420 delta += runtime->buffer_size;
421 hw_base += runtime->buffer_size;
422 if (hw_base >= runtime->boundary) {
423 hw_base = 0;
424 crossed_boundary++;
425 }
426 new_hw_ptr = hw_base + pos;
427 hdelta -= runtime->hw_ptr_buffer_jiffies;
428 }
429 goto no_delta_check;
430 }
431
432 /* something must be really wrong */
433 if (delta >= runtime->buffer_size + runtime->period_size) {
434 hw_ptr_error(substream,
435 "Unexpected hw_pointer value %s"
436 "(stream=%i, pos=%ld, new_hw_ptr=%ld, "
437 "old_hw_ptr=%ld)\n",
438 in_interrupt ? "[Q] " : "[P]",
439 substream->stream, (long)pos,
440 (long)new_hw_ptr, (long)old_hw_ptr);
441 return 0;
442 }
443
444 /* Do jiffies check only in xrun_debug mode */
445 if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
446 goto no_jiffies_check;
447
448 /* Skip the jiffies check for hardwares with BATCH flag.
449 * Such hardware usually just increases the position at each IRQ,
450 * thus it can't give any strange position.
451 */
452 if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
453 goto no_jiffies_check;
454 hdelta = delta;
455 if (hdelta < runtime->delay)
456 goto no_jiffies_check;
457 hdelta -= runtime->delay;
458 jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
459 if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
460 delta = jdelta /
461 (((runtime->period_size * HZ) / runtime->rate)
462 + HZ/100);
463 /* move new_hw_ptr according jiffies not pos variable */
464 new_hw_ptr = old_hw_ptr;
465 hw_base = delta;
466 /* use loop to avoid checks for delta overflows */
467 /* the delta value is small or zero in most cases */
468 while (delta > 0) {
469 new_hw_ptr += runtime->period_size;
470 if (new_hw_ptr >= runtime->boundary) {
471 new_hw_ptr -= runtime->boundary;
472 crossed_boundary--;
473 }
474 delta--;
475 }
476 /* align hw_base to buffer_size */
477 hw_ptr_error(substream,
478 "hw_ptr skipping! %s"
479 "(pos=%ld, delta=%ld, period=%ld, "
480 "jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
481 in_interrupt ? "[Q] " : "",
482 (long)pos, (long)hdelta,
483 (long)runtime->period_size, jdelta,
484 ((hdelta * HZ) / runtime->rate), hw_base,
485 (unsigned long)old_hw_ptr,
486 (unsigned long)new_hw_ptr);
487 /* reset values to proper state */
488 delta = 0;
489 hw_base = new_hw_ptr - (new_hw_ptr % runtime->buffer_size);
490 }
491 no_jiffies_check:
492 if (delta > runtime->period_size + runtime->period_size / 2) {
493 hw_ptr_error(substream,
494 "Lost interrupts? %s"
495 "(stream=%i, delta=%ld, new_hw_ptr=%ld, "
496 "old_hw_ptr=%ld)\n",
497 in_interrupt ? "[Q] " : "",
498 substream->stream, (long)delta,
499 (long)new_hw_ptr,
500 (long)old_hw_ptr);
501 }
502
503 no_delta_check:
504 if (runtime->status->hw_ptr == new_hw_ptr)
505 return 0;
506
507 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
508 runtime->silence_size > 0)
509 snd_pcm_playback_silence(substream, new_hw_ptr);
510
511 if (in_interrupt) {
512 delta = new_hw_ptr - runtime->hw_ptr_interrupt;
513 if (delta < 0)
514 delta += runtime->boundary;
515 delta -= (snd_pcm_uframes_t)delta % runtime->period_size;
516 runtime->hw_ptr_interrupt += delta;
517 if (runtime->hw_ptr_interrupt >= runtime->boundary)
518 runtime->hw_ptr_interrupt -= runtime->boundary;
519 }
520 runtime->hw_ptr_base = hw_base;
521 runtime->status->hw_ptr = new_hw_ptr;
522 runtime->hw_ptr_jiffies = curr_jiffies;
523 if (crossed_boundary) {
524 snd_BUG_ON(crossed_boundary != 1);
525 runtime->hw_ptr_wrap += runtime->boundary;
526 }
527 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
528 runtime->status->tstamp = curr_tstamp;
529
530 if (!(runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)) {
531 /*
532 * no wall clock available, provide audio timestamp
533 * derived from pointer position+delay
534 */
535 u64 audio_frames, audio_nsecs;
536
537 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
538 audio_frames = runtime->hw_ptr_wrap
539 + runtime->status->hw_ptr
540 - runtime->delay;
541 else
542 audio_frames = runtime->hw_ptr_wrap
543 + runtime->status->hw_ptr
544 + runtime->delay;
545 audio_nsecs = div_u64(audio_frames * 1000000000LL,
546 runtime->rate);
547 audio_tstamp = ns_to_timespec(audio_nsecs);
548 }
549 runtime->status->audio_tstamp = audio_tstamp;
550 }
551
552 return snd_pcm_update_state(substream, runtime);
553}
554
555/* CAUTION: call it with irq disabled */
556int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
557{
558 return snd_pcm_update_hw_ptr0(substream, 0);
559}
560
561/**
562 * snd_pcm_set_ops - set the PCM operators
563 * @pcm: the pcm instance
564 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
565 * @ops: the operator table
566 *
567 * Sets the given PCM operators to the pcm instance.
568 */
569void snd_pcm_set_ops(struct snd_pcm *pcm, int direction,
570 const struct snd_pcm_ops *ops)
571{
572 struct snd_pcm_str *stream = &pcm->streams[direction];
573 struct snd_pcm_substream *substream;
574
575 for (substream = stream->substream; substream != NULL; substream = substream->next)
576 substream->ops = ops;
577}
578
579EXPORT_SYMBOL(snd_pcm_set_ops);
580
581/**
582 * snd_pcm_sync - set the PCM sync id
583 * @substream: the pcm substream
584 *
585 * Sets the PCM sync identifier for the card.
586 */
587void snd_pcm_set_sync(struct snd_pcm_substream *substream)
588{
589 struct snd_pcm_runtime *runtime = substream->runtime;
590
591 runtime->sync.id32[0] = substream->pcm->card->number;
592 runtime->sync.id32[1] = -1;
593 runtime->sync.id32[2] = -1;
594 runtime->sync.id32[3] = -1;
595}
596
597EXPORT_SYMBOL(snd_pcm_set_sync);
598
599/*
600 * Standard ioctl routine
601 */
602
603static inline unsigned int div32(unsigned int a, unsigned int b,
604 unsigned int *r)
605{
606 if (b == 0) {
607 *r = 0;
608 return UINT_MAX;
609 }
610 *r = a % b;
611 return a / b;
612}
613
614static inline unsigned int div_down(unsigned int a, unsigned int b)
615{
616 if (b == 0)
617 return UINT_MAX;
618 return a / b;
619}
620
621static inline unsigned int div_up(unsigned int a, unsigned int b)
622{
623 unsigned int r;
624 unsigned int q;
625 if (b == 0)
626 return UINT_MAX;
627 q = div32(a, b, &r);
628 if (r)
629 ++q;
630 return q;
631}
632
633static inline unsigned int mul(unsigned int a, unsigned int b)
634{
635 if (a == 0)
636 return 0;
637 if (div_down(UINT_MAX, a) < b)
638 return UINT_MAX;
639 return a * b;
640}
641
642static inline unsigned int muldiv32(unsigned int a, unsigned int b,
643 unsigned int c, unsigned int *r)
644{
645 u_int64_t n = (u_int64_t) a * b;
646 if (c == 0) {
647 snd_BUG_ON(!n);
648 *r = 0;
649 return UINT_MAX;
650 }
651 n = div_u64_rem(n, c, r);
652 if (n >= UINT_MAX) {
653 *r = 0;
654 return UINT_MAX;
655 }
656 return n;
657}
658
659/**
660 * snd_interval_refine - refine the interval value of configurator
661 * @i: the interval value to refine
662 * @v: the interval value to refer to
663 *
664 * Refines the interval value with the reference value.
665 * The interval is changed to the range satisfying both intervals.
666 * The interval status (min, max, integer, etc.) are evaluated.
667 *
668 * Return: Positive if the value is changed, zero if it's not changed, or a
669 * negative error code.
670 */
671int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
672{
673 int changed = 0;
674 if (snd_BUG_ON(snd_interval_empty(i)))
675 return -EINVAL;
676 if (i->min < v->min) {
677 i->min = v->min;
678 i->openmin = v->openmin;
679 changed = 1;
680 } else if (i->min == v->min && !i->openmin && v->openmin) {
681 i->openmin = 1;
682 changed = 1;
683 }
684 if (i->max > v->max) {
685 i->max = v->max;
686 i->openmax = v->openmax;
687 changed = 1;
688 } else if (i->max == v->max && !i->openmax && v->openmax) {
689 i->openmax = 1;
690 changed = 1;
691 }
692 if (!i->integer && v->integer) {
693 i->integer = 1;
694 changed = 1;
695 }
696 if (i->integer) {
697 if (i->openmin) {
698 i->min++;
699 i->openmin = 0;
700 }
701 if (i->openmax) {
702 i->max--;
703 i->openmax = 0;
704 }
705 } else if (!i->openmin && !i->openmax && i->min == i->max)
706 i->integer = 1;
707 if (snd_interval_checkempty(i)) {
708 snd_interval_none(i);
709 return -EINVAL;
710 }
711 return changed;
712}
713
714EXPORT_SYMBOL(snd_interval_refine);
715
716static int snd_interval_refine_first(struct snd_interval *i)
717{
718 if (snd_BUG_ON(snd_interval_empty(i)))
719 return -EINVAL;
720 if (snd_interval_single(i))
721 return 0;
722 i->max = i->min;
723 i->openmax = i->openmin;
724 if (i->openmax)
725 i->max++;
726 return 1;
727}
728
729static int snd_interval_refine_last(struct snd_interval *i)
730{
731 if (snd_BUG_ON(snd_interval_empty(i)))
732 return -EINVAL;
733 if (snd_interval_single(i))
734 return 0;
735 i->min = i->max;
736 i->openmin = i->openmax;
737 if (i->openmin)
738 i->min--;
739 return 1;
740}
741
742void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
743{
744 if (a->empty || b->empty) {
745 snd_interval_none(c);
746 return;
747 }
748 c->empty = 0;
749 c->min = mul(a->min, b->min);
750 c->openmin = (a->openmin || b->openmin);
751 c->max = mul(a->max, b->max);
752 c->openmax = (a->openmax || b->openmax);
753 c->integer = (a->integer && b->integer);
754}
755
756/**
757 * snd_interval_div - refine the interval value with division
758 * @a: dividend
759 * @b: divisor
760 * @c: quotient
761 *
762 * c = a / b
763 *
764 * Returns non-zero if the value is changed, zero if not changed.
765 */
766void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
767{
768 unsigned int r;
769 if (a->empty || b->empty) {
770 snd_interval_none(c);
771 return;
772 }
773 c->empty = 0;
774 c->min = div32(a->min, b->max, &r);
775 c->openmin = (r || a->openmin || b->openmax);
776 if (b->min > 0) {
777 c->max = div32(a->max, b->min, &r);
778 if (r) {
779 c->max++;
780 c->openmax = 1;
781 } else
782 c->openmax = (a->openmax || b->openmin);
783 } else {
784 c->max = UINT_MAX;
785 c->openmax = 0;
786 }
787 c->integer = 0;
788}
789
790/**
791 * snd_interval_muldivk - refine the interval value
792 * @a: dividend 1
793 * @b: dividend 2
794 * @k: divisor (as integer)
795 * @c: result
796 *
797 * c = a * b / k
798 *
799 * Returns non-zero if the value is changed, zero if not changed.
800 */
801void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
802 unsigned int k, struct snd_interval *c)
803{
804 unsigned int r;
805 if (a->empty || b->empty) {
806 snd_interval_none(c);
807 return;
808 }
809 c->empty = 0;
810 c->min = muldiv32(a->min, b->min, k, &r);
811 c->openmin = (r || a->openmin || b->openmin);
812 c->max = muldiv32(a->max, b->max, k, &r);
813 if (r) {
814 c->max++;
815 c->openmax = 1;
816 } else
817 c->openmax = (a->openmax || b->openmax);
818 c->integer = 0;
819}
820
821/**
822 * snd_interval_mulkdiv - refine the interval value
823 * @a: dividend 1
824 * @k: dividend 2 (as integer)
825 * @b: divisor
826 * @c: result
827 *
828 * c = a * k / b
829 *
830 * Returns non-zero if the value is changed, zero if not changed.
831 */
832void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
833 const struct snd_interval *b, struct snd_interval *c)
834{
835 unsigned int r;
836 if (a->empty || b->empty) {
837 snd_interval_none(c);
838 return;
839 }
840 c->empty = 0;
841 c->min = muldiv32(a->min, k, b->max, &r);
842 c->openmin = (r || a->openmin || b->openmax);
843 if (b->min > 0) {
844 c->max = muldiv32(a->max, k, b->min, &r);
845 if (r) {
846 c->max++;
847 c->openmax = 1;
848 } else
849 c->openmax = (a->openmax || b->openmin);
850 } else {
851 c->max = UINT_MAX;
852 c->openmax = 0;
853 }
854 c->integer = 0;
855}
856
857/* ---- */
858
859
860/**
861 * snd_interval_ratnum - refine the interval value
862 * @i: interval to refine
863 * @rats_count: number of ratnum_t
864 * @rats: ratnum_t array
865 * @nump: pointer to store the resultant numerator
866 * @denp: pointer to store the resultant denominator
867 *
868 * Return: Positive if the value is changed, zero if it's not changed, or a
869 * negative error code.
870 */
871int snd_interval_ratnum(struct snd_interval *i,
872 unsigned int rats_count, struct snd_ratnum *rats,
873 unsigned int *nump, unsigned int *denp)
874{
875 unsigned int best_num, best_den;
876 int best_diff;
877 unsigned int k;
878 struct snd_interval t;
879 int err;
880 unsigned int result_num, result_den;
881 int result_diff;
882
883 best_num = best_den = best_diff = 0;
884 for (k = 0; k < rats_count; ++k) {
885 unsigned int num = rats[k].num;
886 unsigned int den;
887 unsigned int q = i->min;
888 int diff;
889 if (q == 0)
890 q = 1;
891 den = div_up(num, q);
892 if (den < rats[k].den_min)
893 continue;
894 if (den > rats[k].den_max)
895 den = rats[k].den_max;
896 else {
897 unsigned int r;
898 r = (den - rats[k].den_min) % rats[k].den_step;
899 if (r != 0)
900 den -= r;
901 }
902 diff = num - q * den;
903 if (diff < 0)
904 diff = -diff;
905 if (best_num == 0 ||
906 diff * best_den < best_diff * den) {
907 best_diff = diff;
908 best_den = den;
909 best_num = num;
910 }
911 }
912 if (best_den == 0) {
913 i->empty = 1;
914 return -EINVAL;
915 }
916 t.min = div_down(best_num, best_den);
917 t.openmin = !!(best_num % best_den);
918
919 result_num = best_num;
920 result_diff = best_diff;
921 result_den = best_den;
922 best_num = best_den = best_diff = 0;
923 for (k = 0; k < rats_count; ++k) {
924 unsigned int num = rats[k].num;
925 unsigned int den;
926 unsigned int q = i->max;
927 int diff;
928 if (q == 0) {
929 i->empty = 1;
930 return -EINVAL;
931 }
932 den = div_down(num, q);
933 if (den > rats[k].den_max)
934 continue;
935 if (den < rats[k].den_min)
936 den = rats[k].den_min;
937 else {
938 unsigned int r;
939 r = (den - rats[k].den_min) % rats[k].den_step;
940 if (r != 0)
941 den += rats[k].den_step - r;
942 }
943 diff = q * den - num;
944 if (diff < 0)
945 diff = -diff;
946 if (best_num == 0 ||
947 diff * best_den < best_diff * den) {
948 best_diff = diff;
949 best_den = den;
950 best_num = num;
951 }
952 }
953 if (best_den == 0) {
954 i->empty = 1;
955 return -EINVAL;
956 }
957 t.max = div_up(best_num, best_den);
958 t.openmax = !!(best_num % best_den);
959 t.integer = 0;
960 err = snd_interval_refine(i, &t);
961 if (err < 0)
962 return err;
963
964 if (snd_interval_single(i)) {
965 if (best_diff * result_den < result_diff * best_den) {
966 result_num = best_num;
967 result_den = best_den;
968 }
969 if (nump)
970 *nump = result_num;
971 if (denp)
972 *denp = result_den;
973 }
974 return err;
975}
976
977EXPORT_SYMBOL(snd_interval_ratnum);
978
979/**
980 * snd_interval_ratden - refine the interval value
981 * @i: interval to refine
982 * @rats_count: number of struct ratden
983 * @rats: struct ratden array
984 * @nump: pointer to store the resultant numerator
985 * @denp: pointer to store the resultant denominator
986 *
987 * Return: Positive if the value is changed, zero if it's not changed, or a
988 * negative error code.
989 */
990static int snd_interval_ratden(struct snd_interval *i,
991 unsigned int rats_count, struct snd_ratden *rats,
992 unsigned int *nump, unsigned int *denp)
993{
994 unsigned int best_num, best_diff, best_den;
995 unsigned int k;
996 struct snd_interval t;
997 int err;
998
999 best_num = best_den = best_diff = 0;
1000 for (k = 0; k < rats_count; ++k) {
1001 unsigned int num;
1002 unsigned int den = rats[k].den;
1003 unsigned int q = i->min;
1004 int diff;
1005 num = mul(q, den);
1006 if (num > rats[k].num_max)
1007 continue;
1008 if (num < rats[k].num_min)
1009 num = rats[k].num_max;
1010 else {
1011 unsigned int r;
1012 r = (num - rats[k].num_min) % rats[k].num_step;
1013 if (r != 0)
1014 num += rats[k].num_step - r;
1015 }
1016 diff = num - q * den;
1017 if (best_num == 0 ||
1018 diff * best_den < best_diff * den) {
1019 best_diff = diff;
1020 best_den = den;
1021 best_num = num;
1022 }
1023 }
1024 if (best_den == 0) {
1025 i->empty = 1;
1026 return -EINVAL;
1027 }
1028 t.min = div_down(best_num, best_den);
1029 t.openmin = !!(best_num % best_den);
1030
1031 best_num = best_den = best_diff = 0;
1032 for (k = 0; k < rats_count; ++k) {
1033 unsigned int num;
1034 unsigned int den = rats[k].den;
1035 unsigned int q = i->max;
1036 int diff;
1037 num = mul(q, den);
1038 if (num < rats[k].num_min)
1039 continue;
1040 if (num > rats[k].num_max)
1041 num = rats[k].num_max;
1042 else {
1043 unsigned int r;
1044 r = (num - rats[k].num_min) % rats[k].num_step;
1045 if (r != 0)
1046 num -= r;
1047 }
1048 diff = q * den - num;
1049 if (best_num == 0 ||
1050 diff * best_den < best_diff * den) {
1051 best_diff = diff;
1052 best_den = den;
1053 best_num = num;
1054 }
1055 }
1056 if (best_den == 0) {
1057 i->empty = 1;
1058 return -EINVAL;
1059 }
1060 t.max = div_up(best_num, best_den);
1061 t.openmax = !!(best_num % best_den);
1062 t.integer = 0;
1063 err = snd_interval_refine(i, &t);
1064 if (err < 0)
1065 return err;
1066
1067 if (snd_interval_single(i)) {
1068 if (nump)
1069 *nump = best_num;
1070 if (denp)
1071 *denp = best_den;
1072 }
1073 return err;
1074}
1075
1076/**
1077 * snd_interval_list - refine the interval value from the list
1078 * @i: the interval value to refine
1079 * @count: the number of elements in the list
1080 * @list: the value list
1081 * @mask: the bit-mask to evaluate
1082 *
1083 * Refines the interval value from the list.
1084 * When mask is non-zero, only the elements corresponding to bit 1 are
1085 * evaluated.
1086 *
1087 * Return: Positive if the value is changed, zero if it's not changed, or a
1088 * negative error code.
1089 */
1090int snd_interval_list(struct snd_interval *i, unsigned int count,
1091 const unsigned int *list, unsigned int mask)
1092{
1093 unsigned int k;
1094 struct snd_interval list_range;
1095
1096 if (!count) {
1097 i->empty = 1;
1098 return -EINVAL;
1099 }
1100 snd_interval_any(&list_range);
1101 list_range.min = UINT_MAX;
1102 list_range.max = 0;
1103 for (k = 0; k < count; k++) {
1104 if (mask && !(mask & (1 << k)))
1105 continue;
1106 if (!snd_interval_test(i, list[k]))
1107 continue;
1108 list_range.min = min(list_range.min, list[k]);
1109 list_range.max = max(list_range.max, list[k]);
1110 }
1111 return snd_interval_refine(i, &list_range);
1112}
1113
1114EXPORT_SYMBOL(snd_interval_list);
1115
1116static int snd_interval_step(struct snd_interval *i, unsigned int min, unsigned int step)
1117{
1118 unsigned int n;
1119 int changed = 0;
1120 n = (i->min - min) % step;
1121 if (n != 0 || i->openmin) {
1122 i->min += step - n;
1123 changed = 1;
1124 }
1125 n = (i->max - min) % step;
1126 if (n != 0 || i->openmax) {
1127 i->max -= n;
1128 changed = 1;
1129 }
1130 if (snd_interval_checkempty(i)) {
1131 i->empty = 1;
1132 return -EINVAL;
1133 }
1134 return changed;
1135}
1136
1137/* Info constraints helpers */
1138
1139/**
1140 * snd_pcm_hw_rule_add - add the hw-constraint rule
1141 * @runtime: the pcm runtime instance
1142 * @cond: condition bits
1143 * @var: the variable to evaluate
1144 * @func: the evaluation function
1145 * @private: the private data pointer passed to function
1146 * @dep: the dependent variables
1147 *
1148 * Return: Zero if successful, or a negative error code on failure.
1149 */
1150int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
1151 int var,
1152 snd_pcm_hw_rule_func_t func, void *private,
1153 int dep, ...)
1154{
1155 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1156 struct snd_pcm_hw_rule *c;
1157 unsigned int k;
1158 va_list args;
1159 va_start(args, dep);
1160 if (constrs->rules_num >= constrs->rules_all) {
1161 struct snd_pcm_hw_rule *new;
1162 unsigned int new_rules = constrs->rules_all + 16;
1163 new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
1164 if (!new) {
1165 va_end(args);
1166 return -ENOMEM;
1167 }
1168 if (constrs->rules) {
1169 memcpy(new, constrs->rules,
1170 constrs->rules_num * sizeof(*c));
1171 kfree(constrs->rules);
1172 }
1173 constrs->rules = new;
1174 constrs->rules_all = new_rules;
1175 }
1176 c = &constrs->rules[constrs->rules_num];
1177 c->cond = cond;
1178 c->func = func;
1179 c->var = var;
1180 c->private = private;
1181 k = 0;
1182 while (1) {
1183 if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps))) {
1184 va_end(args);
1185 return -EINVAL;
1186 }
1187 c->deps[k++] = dep;
1188 if (dep < 0)
1189 break;
1190 dep = va_arg(args, int);
1191 }
1192 constrs->rules_num++;
1193 va_end(args);
1194 return 0;
1195}
1196
1197EXPORT_SYMBOL(snd_pcm_hw_rule_add);
1198
1199/**
1200 * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
1201 * @runtime: PCM runtime instance
1202 * @var: hw_params variable to apply the mask
1203 * @mask: the bitmap mask
1204 *
1205 * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
1206 *
1207 * Return: Zero if successful, or a negative error code on failure.
1208 */
1209int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1210 u_int32_t mask)
1211{
1212 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1213 struct snd_mask *maskp = constrs_mask(constrs, var);
1214 *maskp->bits &= mask;
1215 memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
1216 if (*maskp->bits == 0)
1217 return -EINVAL;
1218 return 0;
1219}
1220
1221/**
1222 * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
1223 * @runtime: PCM runtime instance
1224 * @var: hw_params variable to apply the mask
1225 * @mask: the 64bit bitmap mask
1226 *
1227 * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
1228 *
1229 * Return: Zero if successful, or a negative error code on failure.
1230 */
1231int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1232 u_int64_t mask)
1233{
1234 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1235 struct snd_mask *maskp = constrs_mask(constrs, var);
1236 maskp->bits[0] &= (u_int32_t)mask;
1237 maskp->bits[1] &= (u_int32_t)(mask >> 32);
1238 memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
1239 if (! maskp->bits[0] && ! maskp->bits[1])
1240 return -EINVAL;
1241 return 0;
1242}
1243EXPORT_SYMBOL(snd_pcm_hw_constraint_mask64);
1244
1245/**
1246 * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
1247 * @runtime: PCM runtime instance
1248 * @var: hw_params variable to apply the integer constraint
1249 *
1250 * Apply the constraint of integer to an interval parameter.
1251 *
1252 * Return: Positive if the value is changed, zero if it's not changed, or a
1253 * negative error code.
1254 */
1255int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
1256{
1257 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1258 return snd_interval_setinteger(constrs_interval(constrs, var));
1259}
1260
1261EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
1262
1263/**
1264 * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
1265 * @runtime: PCM runtime instance
1266 * @var: hw_params variable to apply the range
1267 * @min: the minimal value
1268 * @max: the maximal value
1269 *
1270 * Apply the min/max range constraint to an interval parameter.
1271 *
1272 * Return: Positive if the value is changed, zero if it's not changed, or a
1273 * negative error code.
1274 */
1275int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1276 unsigned int min, unsigned int max)
1277{
1278 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1279 struct snd_interval t;
1280 t.min = min;
1281 t.max = max;
1282 t.openmin = t.openmax = 0;
1283 t.integer = 0;
1284 return snd_interval_refine(constrs_interval(constrs, var), &t);
1285}
1286
1287EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
1288
1289static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
1290 struct snd_pcm_hw_rule *rule)
1291{
1292 struct snd_pcm_hw_constraint_list *list = rule->private;
1293 return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
1294}
1295
1296
1297/**
1298 * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
1299 * @runtime: PCM runtime instance
1300 * @cond: condition bits
1301 * @var: hw_params variable to apply the list constraint
1302 * @l: list
1303 *
1304 * Apply the list of constraints to an interval parameter.
1305 *
1306 * Return: Zero if successful, or a negative error code on failure.
1307 */
1308int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1309 unsigned int cond,
1310 snd_pcm_hw_param_t var,
1311 const struct snd_pcm_hw_constraint_list *l)
1312{
1313 return snd_pcm_hw_rule_add(runtime, cond, var,
1314 snd_pcm_hw_rule_list, (void *)l,
1315 var, -1);
1316}
1317
1318EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
1319
1320static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
1321 struct snd_pcm_hw_rule *rule)
1322{
1323 struct snd_pcm_hw_constraint_ratnums *r = rule->private;
1324 unsigned int num = 0, den = 0;
1325 int err;
1326 err = snd_interval_ratnum(hw_param_interval(params, rule->var),
1327 r->nrats, r->rats, &num, &den);
1328 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1329 params->rate_num = num;
1330 params->rate_den = den;
1331 }
1332 return err;
1333}
1334
1335/**
1336 * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
1337 * @runtime: PCM runtime instance
1338 * @cond: condition bits
1339 * @var: hw_params variable to apply the ratnums constraint
1340 * @r: struct snd_ratnums constriants
1341 *
1342 * Return: Zero if successful, or a negative error code on failure.
1343 */
1344int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1345 unsigned int cond,
1346 snd_pcm_hw_param_t var,
1347 struct snd_pcm_hw_constraint_ratnums *r)
1348{
1349 return snd_pcm_hw_rule_add(runtime, cond, var,
1350 snd_pcm_hw_rule_ratnums, r,
1351 var, -1);
1352}
1353
1354EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
1355
1356static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
1357 struct snd_pcm_hw_rule *rule)
1358{
1359 struct snd_pcm_hw_constraint_ratdens *r = rule->private;
1360 unsigned int num = 0, den = 0;
1361 int err = snd_interval_ratden(hw_param_interval(params, rule->var),
1362 r->nrats, r->rats, &num, &den);
1363 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1364 params->rate_num = num;
1365 params->rate_den = den;
1366 }
1367 return err;
1368}
1369
1370/**
1371 * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
1372 * @runtime: PCM runtime instance
1373 * @cond: condition bits
1374 * @var: hw_params variable to apply the ratdens constraint
1375 * @r: struct snd_ratdens constriants
1376 *
1377 * Return: Zero if successful, or a negative error code on failure.
1378 */
1379int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1380 unsigned int cond,
1381 snd_pcm_hw_param_t var,
1382 struct snd_pcm_hw_constraint_ratdens *r)
1383{
1384 return snd_pcm_hw_rule_add(runtime, cond, var,
1385 snd_pcm_hw_rule_ratdens, r,
1386 var, -1);
1387}
1388
1389EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
1390
1391static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
1392 struct snd_pcm_hw_rule *rule)
1393{
1394 unsigned int l = (unsigned long) rule->private;
1395 int width = l & 0xffff;
1396 unsigned int msbits = l >> 16;
1397 struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
1398 if (snd_interval_single(i) && snd_interval_value(i) == width)
1399 params->msbits = msbits;
1400 return 0;
1401}
1402
1403/**
1404 * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
1405 * @runtime: PCM runtime instance
1406 * @cond: condition bits
1407 * @width: sample bits width
1408 * @msbits: msbits width
1409 *
1410 * Return: Zero if successful, or a negative error code on failure.
1411 */
1412int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1413 unsigned int cond,
1414 unsigned int width,
1415 unsigned int msbits)
1416{
1417 unsigned long l = (msbits << 16) | width;
1418 return snd_pcm_hw_rule_add(runtime, cond, -1,
1419 snd_pcm_hw_rule_msbits,
1420 (void*) l,
1421 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1422}
1423
1424EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
1425
1426static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
1427 struct snd_pcm_hw_rule *rule)
1428{
1429 unsigned long step = (unsigned long) rule->private;
1430 return snd_interval_step(hw_param_interval(params, rule->var), 0, step);
1431}
1432
1433/**
1434 * snd_pcm_hw_constraint_step - add a hw constraint step rule
1435 * @runtime: PCM runtime instance
1436 * @cond: condition bits
1437 * @var: hw_params variable to apply the step constraint
1438 * @step: step size
1439 *
1440 * Return: Zero if successful, or a negative error code on failure.
1441 */
1442int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1443 unsigned int cond,
1444 snd_pcm_hw_param_t var,
1445 unsigned long step)
1446{
1447 return snd_pcm_hw_rule_add(runtime, cond, var,
1448 snd_pcm_hw_rule_step, (void *) step,
1449 var, -1);
1450}
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}
1482
1483EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
1484
1485static int snd_pcm_hw_rule_noresample_func(struct snd_pcm_hw_params *params,
1486 struct snd_pcm_hw_rule *rule)
1487{
1488 unsigned int base_rate = (unsigned int)(uintptr_t)rule->private;
1489 struct snd_interval *rate;
1490
1491 rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1492 return snd_interval_list(rate, 1, &base_rate, 0);
1493}
1494
1495/**
1496 * snd_pcm_hw_rule_noresample - add a rule to allow disabling hw resampling
1497 * @runtime: PCM runtime instance
1498 * @base_rate: the rate at which the hardware does not resample
1499 *
1500 * Return: Zero if successful, or a negative error code on failure.
1501 */
1502int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
1503 unsigned int base_rate)
1504{
1505 return snd_pcm_hw_rule_add(runtime, SNDRV_PCM_HW_PARAMS_NORESAMPLE,
1506 SNDRV_PCM_HW_PARAM_RATE,
1507 snd_pcm_hw_rule_noresample_func,
1508 (void *)(uintptr_t)base_rate,
1509 SNDRV_PCM_HW_PARAM_RATE, -1);
1510}
1511EXPORT_SYMBOL(snd_pcm_hw_rule_noresample);
1512
1513static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
1514 snd_pcm_hw_param_t var)
1515{
1516 if (hw_is_mask(var)) {
1517 snd_mask_any(hw_param_mask(params, var));
1518 params->cmask |= 1 << var;
1519 params->rmask |= 1 << var;
1520 return;
1521 }
1522 if (hw_is_interval(var)) {
1523 snd_interval_any(hw_param_interval(params, var));
1524 params->cmask |= 1 << var;
1525 params->rmask |= 1 << var;
1526 return;
1527 }
1528 snd_BUG();
1529}
1530
1531void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
1532{
1533 unsigned int k;
1534 memset(params, 0, sizeof(*params));
1535 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1536 _snd_pcm_hw_param_any(params, k);
1537 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1538 _snd_pcm_hw_param_any(params, k);
1539 params->info = ~0U;
1540}
1541
1542EXPORT_SYMBOL(_snd_pcm_hw_params_any);
1543
1544/**
1545 * snd_pcm_hw_param_value - return @params field @var value
1546 * @params: the hw_params instance
1547 * @var: parameter to retrieve
1548 * @dir: pointer to the direction (-1,0,1) or %NULL
1549 *
1550 * Return: The value for field @var if it's fixed in configuration space
1551 * defined by @params. -%EINVAL otherwise.
1552 */
1553int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
1554 snd_pcm_hw_param_t var, int *dir)
1555{
1556 if (hw_is_mask(var)) {
1557 const struct snd_mask *mask = hw_param_mask_c(params, var);
1558 if (!snd_mask_single(mask))
1559 return -EINVAL;
1560 if (dir)
1561 *dir = 0;
1562 return snd_mask_value(mask);
1563 }
1564 if (hw_is_interval(var)) {
1565 const struct snd_interval *i = hw_param_interval_c(params, var);
1566 if (!snd_interval_single(i))
1567 return -EINVAL;
1568 if (dir)
1569 *dir = i->openmin;
1570 return snd_interval_value(i);
1571 }
1572 return -EINVAL;
1573}
1574
1575EXPORT_SYMBOL(snd_pcm_hw_param_value);
1576
1577void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
1578 snd_pcm_hw_param_t var)
1579{
1580 if (hw_is_mask(var)) {
1581 snd_mask_none(hw_param_mask(params, var));
1582 params->cmask |= 1 << var;
1583 params->rmask |= 1 << var;
1584 } else if (hw_is_interval(var)) {
1585 snd_interval_none(hw_param_interval(params, var));
1586 params->cmask |= 1 << var;
1587 params->rmask |= 1 << var;
1588 } else {
1589 snd_BUG();
1590 }
1591}
1592
1593EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
1594
1595static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
1596 snd_pcm_hw_param_t var)
1597{
1598 int changed;
1599 if (hw_is_mask(var))
1600 changed = snd_mask_refine_first(hw_param_mask(params, var));
1601 else if (hw_is_interval(var))
1602 changed = snd_interval_refine_first(hw_param_interval(params, var));
1603 else
1604 return -EINVAL;
1605 if (changed) {
1606 params->cmask |= 1 << var;
1607 params->rmask |= 1 << var;
1608 }
1609 return changed;
1610}
1611
1612
1613/**
1614 * snd_pcm_hw_param_first - refine config space and return minimum value
1615 * @pcm: PCM instance
1616 * @params: the hw_params instance
1617 * @var: parameter to retrieve
1618 * @dir: pointer to the direction (-1,0,1) or %NULL
1619 *
1620 * Inside configuration space defined by @params remove from @var all
1621 * values > minimum. Reduce configuration space accordingly.
1622 *
1623 * Return: The minimum, or a negative error code on failure.
1624 */
1625int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
1626 struct snd_pcm_hw_params *params,
1627 snd_pcm_hw_param_t var, int *dir)
1628{
1629 int changed = _snd_pcm_hw_param_first(params, var);
1630 if (changed < 0)
1631 return changed;
1632 if (params->rmask) {
1633 int err = snd_pcm_hw_refine(pcm, params);
1634 if (snd_BUG_ON(err < 0))
1635 return err;
1636 }
1637 return snd_pcm_hw_param_value(params, var, dir);
1638}
1639
1640EXPORT_SYMBOL(snd_pcm_hw_param_first);
1641
1642static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
1643 snd_pcm_hw_param_t var)
1644{
1645 int changed;
1646 if (hw_is_mask(var))
1647 changed = snd_mask_refine_last(hw_param_mask(params, var));
1648 else if (hw_is_interval(var))
1649 changed = snd_interval_refine_last(hw_param_interval(params, var));
1650 else
1651 return -EINVAL;
1652 if (changed) {
1653 params->cmask |= 1 << var;
1654 params->rmask |= 1 << var;
1655 }
1656 return changed;
1657}
1658
1659
1660/**
1661 * snd_pcm_hw_param_last - refine config space and return maximum value
1662 * @pcm: PCM instance
1663 * @params: the hw_params instance
1664 * @var: parameter to retrieve
1665 * @dir: pointer to the direction (-1,0,1) or %NULL
1666 *
1667 * Inside configuration space defined by @params remove from @var all
1668 * values < maximum. Reduce configuration space accordingly.
1669 *
1670 * Return: The maximum, or a negative error code on failure.
1671 */
1672int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
1673 struct snd_pcm_hw_params *params,
1674 snd_pcm_hw_param_t var, int *dir)
1675{
1676 int changed = _snd_pcm_hw_param_last(params, var);
1677 if (changed < 0)
1678 return changed;
1679 if (params->rmask) {
1680 int err = snd_pcm_hw_refine(pcm, params);
1681 if (snd_BUG_ON(err < 0))
1682 return err;
1683 }
1684 return snd_pcm_hw_param_value(params, var, dir);
1685}
1686
1687EXPORT_SYMBOL(snd_pcm_hw_param_last);
1688
1689/**
1690 * snd_pcm_hw_param_choose - choose a configuration defined by @params
1691 * @pcm: PCM instance
1692 * @params: the hw_params instance
1693 *
1694 * Choose one configuration from configuration space defined by @params.
1695 * The configuration chosen is that obtained fixing in this order:
1696 * first access, first format, first subformat, min channels,
1697 * min rate, min period time, max buffer size, min tick time
1698 *
1699 * Return: Zero if successful, or a negative error code on failure.
1700 */
1701int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
1702 struct snd_pcm_hw_params *params)
1703{
1704 static int vars[] = {
1705 SNDRV_PCM_HW_PARAM_ACCESS,
1706 SNDRV_PCM_HW_PARAM_FORMAT,
1707 SNDRV_PCM_HW_PARAM_SUBFORMAT,
1708 SNDRV_PCM_HW_PARAM_CHANNELS,
1709 SNDRV_PCM_HW_PARAM_RATE,
1710 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1711 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1712 SNDRV_PCM_HW_PARAM_TICK_TIME,
1713 -1
1714 };
1715 int err, *v;
1716
1717 for (v = vars; *v != -1; v++) {
1718 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
1719 err = snd_pcm_hw_param_first(pcm, params, *v, NULL);
1720 else
1721 err = snd_pcm_hw_param_last(pcm, params, *v, NULL);
1722 if (snd_BUG_ON(err < 0))
1723 return err;
1724 }
1725 return 0;
1726}
1727
1728static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
1729 void *arg)
1730{
1731 struct snd_pcm_runtime *runtime = substream->runtime;
1732 unsigned long flags;
1733 snd_pcm_stream_lock_irqsave(substream, flags);
1734 if (snd_pcm_running(substream) &&
1735 snd_pcm_update_hw_ptr(substream) >= 0)
1736 runtime->status->hw_ptr %= runtime->buffer_size;
1737 else {
1738 runtime->status->hw_ptr = 0;
1739 runtime->hw_ptr_wrap = 0;
1740 }
1741 snd_pcm_stream_unlock_irqrestore(substream, flags);
1742 return 0;
1743}
1744
1745static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
1746 void *arg)
1747{
1748 struct snd_pcm_channel_info *info = arg;
1749 struct snd_pcm_runtime *runtime = substream->runtime;
1750 int width;
1751 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1752 info->offset = -1;
1753 return 0;
1754 }
1755 width = snd_pcm_format_physical_width(runtime->format);
1756 if (width < 0)
1757 return width;
1758 info->offset = 0;
1759 switch (runtime->access) {
1760 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1761 case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1762 info->first = info->channel * width;
1763 info->step = runtime->channels * width;
1764 break;
1765 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1766 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1767 {
1768 size_t size = runtime->dma_bytes / runtime->channels;
1769 info->first = info->channel * size * 8;
1770 info->step = width;
1771 break;
1772 }
1773 default:
1774 snd_BUG();
1775 break;
1776 }
1777 return 0;
1778}
1779
1780static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
1781 void *arg)
1782{
1783 struct snd_pcm_hw_params *params = arg;
1784 snd_pcm_format_t format;
1785 int channels, width;
1786
1787 params->fifo_size = substream->runtime->hw.fifo_size;
1788 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) {
1789 format = params_format(params);
1790 channels = params_channels(params);
1791 width = snd_pcm_format_physical_width(format);
1792 params->fifo_size /= width * channels;
1793 }
1794 return 0;
1795}
1796
1797/**
1798 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1799 * @substream: the pcm substream instance
1800 * @cmd: ioctl command
1801 * @arg: ioctl argument
1802 *
1803 * Processes the generic ioctl commands for PCM.
1804 * Can be passed as the ioctl callback for PCM ops.
1805 *
1806 * Return: Zero if successful, or a negative error code on failure.
1807 */
1808int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1809 unsigned int cmd, void *arg)
1810{
1811 switch (cmd) {
1812 case SNDRV_PCM_IOCTL1_INFO:
1813 return 0;
1814 case SNDRV_PCM_IOCTL1_RESET:
1815 return snd_pcm_lib_ioctl_reset(substream, arg);
1816 case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1817 return snd_pcm_lib_ioctl_channel_info(substream, arg);
1818 case SNDRV_PCM_IOCTL1_FIFO_SIZE:
1819 return snd_pcm_lib_ioctl_fifo_size(substream, arg);
1820 }
1821 return -ENXIO;
1822}
1823
1824EXPORT_SYMBOL(snd_pcm_lib_ioctl);
1825
1826/**
1827 * snd_pcm_period_elapsed - update the pcm status for the next period
1828 * @substream: the pcm substream instance
1829 *
1830 * This function is called from the interrupt handler when the
1831 * PCM has processed the period size. It will update the current
1832 * pointer, wake up sleepers, etc.
1833 *
1834 * Even if more than one periods have elapsed since the last call, you
1835 * have to call this only once.
1836 */
1837void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
1838{
1839 struct snd_pcm_runtime *runtime;
1840 unsigned long flags;
1841
1842 if (PCM_RUNTIME_CHECK(substream))
1843 return;
1844 runtime = substream->runtime;
1845
1846 if (runtime->transfer_ack_begin)
1847 runtime->transfer_ack_begin(substream);
1848
1849 snd_pcm_stream_lock_irqsave(substream, flags);
1850 if (!snd_pcm_running(substream) ||
1851 snd_pcm_update_hw_ptr0(substream, 1) < 0)
1852 goto _end;
1853
1854 if (substream->timer_running)
1855 snd_timer_interrupt(substream->timer, 1);
1856 _end:
1857 snd_pcm_stream_unlock_irqrestore(substream, flags);
1858 if (runtime->transfer_ack_end)
1859 runtime->transfer_ack_end(substream);
1860 kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
1861}
1862
1863EXPORT_SYMBOL(snd_pcm_period_elapsed);
1864
1865/*
1866 * Wait until avail_min data becomes available
1867 * Returns a negative error code if any error occurs during operation.
1868 * The available space is stored on availp. When err = 0 and avail = 0
1869 * on the capture stream, it indicates the stream is in DRAINING state.
1870 */
1871static int wait_for_avail(struct snd_pcm_substream *substream,
1872 snd_pcm_uframes_t *availp)
1873{
1874 struct snd_pcm_runtime *runtime = substream->runtime;
1875 int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
1876 wait_queue_t wait;
1877 int err = 0;
1878 snd_pcm_uframes_t avail = 0;
1879 long wait_time, tout;
1880
1881 init_waitqueue_entry(&wait, current);
1882 set_current_state(TASK_INTERRUPTIBLE);
1883 add_wait_queue(&runtime->tsleep, &wait);
1884
1885 if (runtime->no_period_wakeup)
1886 wait_time = MAX_SCHEDULE_TIMEOUT;
1887 else {
1888 wait_time = 10;
1889 if (runtime->rate) {
1890 long t = runtime->period_size * 2 / runtime->rate;
1891 wait_time = max(t, wait_time);
1892 }
1893 wait_time = msecs_to_jiffies(wait_time * 1000);
1894 }
1895
1896 for (;;) {
1897 if (signal_pending(current)) {
1898 err = -ERESTARTSYS;
1899 break;
1900 }
1901
1902 /*
1903 * We need to check if space became available already
1904 * (and thus the wakeup happened already) first to close
1905 * the race of space already having become available.
1906 * This check must happen after been added to the waitqueue
1907 * and having current state be INTERRUPTIBLE.
1908 */
1909 if (is_playback)
1910 avail = snd_pcm_playback_avail(runtime);
1911 else
1912 avail = snd_pcm_capture_avail(runtime);
1913 if (avail >= runtime->twake)
1914 break;
1915 snd_pcm_stream_unlock_irq(substream);
1916
1917 tout = schedule_timeout(wait_time);
1918
1919 snd_pcm_stream_lock_irq(substream);
1920 set_current_state(TASK_INTERRUPTIBLE);
1921 switch (runtime->status->state) {
1922 case SNDRV_PCM_STATE_SUSPENDED:
1923 err = -ESTRPIPE;
1924 goto _endloop;
1925 case SNDRV_PCM_STATE_XRUN:
1926 err = -EPIPE;
1927 goto _endloop;
1928 case SNDRV_PCM_STATE_DRAINING:
1929 if (is_playback)
1930 err = -EPIPE;
1931 else
1932 avail = 0; /* indicate draining */
1933 goto _endloop;
1934 case SNDRV_PCM_STATE_OPEN:
1935 case SNDRV_PCM_STATE_SETUP:
1936 case SNDRV_PCM_STATE_DISCONNECTED:
1937 err = -EBADFD;
1938 goto _endloop;
1939 case SNDRV_PCM_STATE_PAUSED:
1940 continue;
1941 }
1942 if (!tout) {
1943 pcm_dbg(substream->pcm,
1944 "%s write error (DMA or IRQ trouble?)\n",
1945 is_playback ? "playback" : "capture");
1946 err = -EIO;
1947 break;
1948 }
1949 }
1950 _endloop:
1951 set_current_state(TASK_RUNNING);
1952 remove_wait_queue(&runtime->tsleep, &wait);
1953 *availp = avail;
1954 return err;
1955}
1956
1957static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream,
1958 unsigned int hwoff,
1959 unsigned long data, unsigned int off,
1960 snd_pcm_uframes_t frames)
1961{
1962 struct snd_pcm_runtime *runtime = substream->runtime;
1963 int err;
1964 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
1965 if (substream->ops->copy) {
1966 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
1967 return err;
1968 } else {
1969 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
1970 if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
1971 return -EFAULT;
1972 }
1973 return 0;
1974}
1975
1976typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff,
1977 unsigned long data, unsigned int off,
1978 snd_pcm_uframes_t size);
1979
1980static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
1981 unsigned long data,
1982 snd_pcm_uframes_t size,
1983 int nonblock,
1984 transfer_f transfer)
1985{
1986 struct snd_pcm_runtime *runtime = substream->runtime;
1987 snd_pcm_uframes_t xfer = 0;
1988 snd_pcm_uframes_t offset = 0;
1989 snd_pcm_uframes_t avail;
1990 int err = 0;
1991
1992 if (size == 0)
1993 return 0;
1994
1995 snd_pcm_stream_lock_irq(substream);
1996 switch (runtime->status->state) {
1997 case SNDRV_PCM_STATE_PREPARED:
1998 case SNDRV_PCM_STATE_RUNNING:
1999 case SNDRV_PCM_STATE_PAUSED:
2000 break;
2001 case SNDRV_PCM_STATE_XRUN:
2002 err = -EPIPE;
2003 goto _end_unlock;
2004 case SNDRV_PCM_STATE_SUSPENDED:
2005 err = -ESTRPIPE;
2006 goto _end_unlock;
2007 default:
2008 err = -EBADFD;
2009 goto _end_unlock;
2010 }
2011
2012 runtime->twake = runtime->control->avail_min ? : 1;
2013 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2014 snd_pcm_update_hw_ptr(substream);
2015 avail = snd_pcm_playback_avail(runtime);
2016 while (size > 0) {
2017 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2018 snd_pcm_uframes_t cont;
2019 if (!avail) {
2020 if (nonblock) {
2021 err = -EAGAIN;
2022 goto _end_unlock;
2023 }
2024 runtime->twake = min_t(snd_pcm_uframes_t, size,
2025 runtime->control->avail_min ? : 1);
2026 err = wait_for_avail(substream, &avail);
2027 if (err < 0)
2028 goto _end_unlock;
2029 }
2030 frames = size > avail ? avail : size;
2031 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2032 if (frames > cont)
2033 frames = cont;
2034 if (snd_BUG_ON(!frames)) {
2035 runtime->twake = 0;
2036 snd_pcm_stream_unlock_irq(substream);
2037 return -EINVAL;
2038 }
2039 appl_ptr = runtime->control->appl_ptr;
2040 appl_ofs = appl_ptr % runtime->buffer_size;
2041 snd_pcm_stream_unlock_irq(substream);
2042 err = transfer(substream, appl_ofs, data, offset, frames);
2043 snd_pcm_stream_lock_irq(substream);
2044 if (err < 0)
2045 goto _end_unlock;
2046 switch (runtime->status->state) {
2047 case SNDRV_PCM_STATE_XRUN:
2048 err = -EPIPE;
2049 goto _end_unlock;
2050 case SNDRV_PCM_STATE_SUSPENDED:
2051 err = -ESTRPIPE;
2052 goto _end_unlock;
2053 default:
2054 break;
2055 }
2056 appl_ptr += frames;
2057 if (appl_ptr >= runtime->boundary)
2058 appl_ptr -= runtime->boundary;
2059 runtime->control->appl_ptr = appl_ptr;
2060 if (substream->ops->ack)
2061 substream->ops->ack(substream);
2062
2063 offset += frames;
2064 size -= frames;
2065 xfer += frames;
2066 avail -= frames;
2067 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
2068 snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
2069 err = snd_pcm_start(substream);
2070 if (err < 0)
2071 goto _end_unlock;
2072 }
2073 }
2074 _end_unlock:
2075 runtime->twake = 0;
2076 if (xfer > 0 && err >= 0)
2077 snd_pcm_update_state(substream, runtime);
2078 snd_pcm_stream_unlock_irq(substream);
2079 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2080}
2081
2082/* sanity-check for read/write methods */
2083static int pcm_sanity_check(struct snd_pcm_substream *substream)
2084{
2085 struct snd_pcm_runtime *runtime;
2086 if (PCM_RUNTIME_CHECK(substream))
2087 return -ENXIO;
2088 runtime = substream->runtime;
2089 if (snd_BUG_ON(!substream->ops->copy && !runtime->dma_area))
2090 return -EINVAL;
2091 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2092 return -EBADFD;
2093 return 0;
2094}
2095
2096snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, const void __user *buf, snd_pcm_uframes_t size)
2097{
2098 struct snd_pcm_runtime *runtime;
2099 int nonblock;
2100 int err;
2101
2102 err = pcm_sanity_check(substream);
2103 if (err < 0)
2104 return err;
2105 runtime = substream->runtime;
2106 nonblock = !!(substream->f_flags & O_NONBLOCK);
2107
2108 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
2109 runtime->channels > 1)
2110 return -EINVAL;
2111 return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock,
2112 snd_pcm_lib_write_transfer);
2113}
2114
2115EXPORT_SYMBOL(snd_pcm_lib_write);
2116
2117static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream,
2118 unsigned int hwoff,
2119 unsigned long data, unsigned int off,
2120 snd_pcm_uframes_t frames)
2121{
2122 struct snd_pcm_runtime *runtime = substream->runtime;
2123 int err;
2124 void __user **bufs = (void __user **)data;
2125 int channels = runtime->channels;
2126 int c;
2127 if (substream->ops->copy) {
2128 if (snd_BUG_ON(!substream->ops->silence))
2129 return -EINVAL;
2130 for (c = 0; c < channels; ++c, ++bufs) {
2131 if (*bufs == NULL) {
2132 if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0)
2133 return err;
2134 } else {
2135 char __user *buf = *bufs + samples_to_bytes(runtime, off);
2136 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2137 return err;
2138 }
2139 }
2140 } else {
2141 /* default transfer behaviour */
2142 size_t dma_csize = runtime->dma_bytes / channels;
2143 for (c = 0; c < channels; ++c, ++bufs) {
2144 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2145 if (*bufs == NULL) {
2146 snd_pcm_format_set_silence(runtime->format, hwbuf, frames);
2147 } else {
2148 char __user *buf = *bufs + samples_to_bytes(runtime, off);
2149 if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames)))
2150 return -EFAULT;
2151 }
2152 }
2153 }
2154 return 0;
2155}
2156
2157snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
2158 void __user **bufs,
2159 snd_pcm_uframes_t frames)
2160{
2161 struct snd_pcm_runtime *runtime;
2162 int nonblock;
2163 int err;
2164
2165 err = pcm_sanity_check(substream);
2166 if (err < 0)
2167 return err;
2168 runtime = substream->runtime;
2169 nonblock = !!(substream->f_flags & O_NONBLOCK);
2170
2171 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2172 return -EINVAL;
2173 return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames,
2174 nonblock, snd_pcm_lib_writev_transfer);
2175}
2176
2177EXPORT_SYMBOL(snd_pcm_lib_writev);
2178
2179static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream,
2180 unsigned int hwoff,
2181 unsigned long data, unsigned int off,
2182 snd_pcm_uframes_t frames)
2183{
2184 struct snd_pcm_runtime *runtime = substream->runtime;
2185 int err;
2186 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
2187 if (substream->ops->copy) {
2188 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
2189 return err;
2190 } else {
2191 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
2192 if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
2193 return -EFAULT;
2194 }
2195 return 0;
2196}
2197
2198static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
2199 unsigned long data,
2200 snd_pcm_uframes_t size,
2201 int nonblock,
2202 transfer_f transfer)
2203{
2204 struct snd_pcm_runtime *runtime = substream->runtime;
2205 snd_pcm_uframes_t xfer = 0;
2206 snd_pcm_uframes_t offset = 0;
2207 snd_pcm_uframes_t avail;
2208 int err = 0;
2209
2210 if (size == 0)
2211 return 0;
2212
2213 snd_pcm_stream_lock_irq(substream);
2214 switch (runtime->status->state) {
2215 case SNDRV_PCM_STATE_PREPARED:
2216 if (size >= runtime->start_threshold) {
2217 err = snd_pcm_start(substream);
2218 if (err < 0)
2219 goto _end_unlock;
2220 }
2221 break;
2222 case SNDRV_PCM_STATE_DRAINING:
2223 case SNDRV_PCM_STATE_RUNNING:
2224 case SNDRV_PCM_STATE_PAUSED:
2225 break;
2226 case SNDRV_PCM_STATE_XRUN:
2227 err = -EPIPE;
2228 goto _end_unlock;
2229 case SNDRV_PCM_STATE_SUSPENDED:
2230 err = -ESTRPIPE;
2231 goto _end_unlock;
2232 default:
2233 err = -EBADFD;
2234 goto _end_unlock;
2235 }
2236
2237 runtime->twake = runtime->control->avail_min ? : 1;
2238 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2239 snd_pcm_update_hw_ptr(substream);
2240 avail = snd_pcm_capture_avail(runtime);
2241 while (size > 0) {
2242 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2243 snd_pcm_uframes_t cont;
2244 if (!avail) {
2245 if (runtime->status->state ==
2246 SNDRV_PCM_STATE_DRAINING) {
2247 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2248 goto _end_unlock;
2249 }
2250 if (nonblock) {
2251 err = -EAGAIN;
2252 goto _end_unlock;
2253 }
2254 runtime->twake = min_t(snd_pcm_uframes_t, size,
2255 runtime->control->avail_min ? : 1);
2256 err = wait_for_avail(substream, &avail);
2257 if (err < 0)
2258 goto _end_unlock;
2259 if (!avail)
2260 continue; /* draining */
2261 }
2262 frames = size > avail ? avail : size;
2263 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2264 if (frames > cont)
2265 frames = cont;
2266 if (snd_BUG_ON(!frames)) {
2267 runtime->twake = 0;
2268 snd_pcm_stream_unlock_irq(substream);
2269 return -EINVAL;
2270 }
2271 appl_ptr = runtime->control->appl_ptr;
2272 appl_ofs = appl_ptr % runtime->buffer_size;
2273 snd_pcm_stream_unlock_irq(substream);
2274 err = transfer(substream, appl_ofs, data, offset, frames);
2275 snd_pcm_stream_lock_irq(substream);
2276 if (err < 0)
2277 goto _end_unlock;
2278 switch (runtime->status->state) {
2279 case SNDRV_PCM_STATE_XRUN:
2280 err = -EPIPE;
2281 goto _end_unlock;
2282 case SNDRV_PCM_STATE_SUSPENDED:
2283 err = -ESTRPIPE;
2284 goto _end_unlock;
2285 default:
2286 break;
2287 }
2288 appl_ptr += frames;
2289 if (appl_ptr >= runtime->boundary)
2290 appl_ptr -= runtime->boundary;
2291 runtime->control->appl_ptr = appl_ptr;
2292 if (substream->ops->ack)
2293 substream->ops->ack(substream);
2294
2295 offset += frames;
2296 size -= frames;
2297 xfer += frames;
2298 avail -= frames;
2299 }
2300 _end_unlock:
2301 runtime->twake = 0;
2302 if (xfer > 0 && err >= 0)
2303 snd_pcm_update_state(substream, runtime);
2304 snd_pcm_stream_unlock_irq(substream);
2305 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2306}
2307
2308snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, void __user *buf, snd_pcm_uframes_t size)
2309{
2310 struct snd_pcm_runtime *runtime;
2311 int nonblock;
2312 int err;
2313
2314 err = pcm_sanity_check(substream);
2315 if (err < 0)
2316 return err;
2317 runtime = substream->runtime;
2318 nonblock = !!(substream->f_flags & O_NONBLOCK);
2319 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED)
2320 return -EINVAL;
2321 return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer);
2322}
2323
2324EXPORT_SYMBOL(snd_pcm_lib_read);
2325
2326static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream,
2327 unsigned int hwoff,
2328 unsigned long data, unsigned int off,
2329 snd_pcm_uframes_t frames)
2330{
2331 struct snd_pcm_runtime *runtime = substream->runtime;
2332 int err;
2333 void __user **bufs = (void __user **)data;
2334 int channels = runtime->channels;
2335 int c;
2336 if (substream->ops->copy) {
2337 for (c = 0; c < channels; ++c, ++bufs) {
2338 char __user *buf;
2339 if (*bufs == NULL)
2340 continue;
2341 buf = *bufs + samples_to_bytes(runtime, off);
2342 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2343 return err;
2344 }
2345 } else {
2346 snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
2347 for (c = 0; c < channels; ++c, ++bufs) {
2348 char *hwbuf;
2349 char __user *buf;
2350 if (*bufs == NULL)
2351 continue;
2352
2353 hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2354 buf = *bufs + samples_to_bytes(runtime, off);
2355 if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
2356 return -EFAULT;
2357 }
2358 }
2359 return 0;
2360}
2361
2362snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
2363 void __user **bufs,
2364 snd_pcm_uframes_t frames)
2365{
2366 struct snd_pcm_runtime *runtime;
2367 int nonblock;
2368 int err;
2369
2370 err = pcm_sanity_check(substream);
2371 if (err < 0)
2372 return err;
2373 runtime = substream->runtime;
2374 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2375 return -EBADFD;
2376
2377 nonblock = !!(substream->f_flags & O_NONBLOCK);
2378 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2379 return -EINVAL;
2380 return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer);
2381}
2382
2383EXPORT_SYMBOL(snd_pcm_lib_readv);
2384
2385/*
2386 * standard channel mapping helpers
2387 */
2388
2389/* default channel maps for multi-channel playbacks, up to 8 channels */
2390const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[] = {
2391 { .channels = 1,
2392 .map = { SNDRV_CHMAP_MONO } },
2393 { .channels = 2,
2394 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
2395 { .channels = 4,
2396 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2397 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2398 { .channels = 6,
2399 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2400 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2401 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE } },
2402 { .channels = 8,
2403 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2404 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2405 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2406 SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
2407 { }
2408};
2409EXPORT_SYMBOL_GPL(snd_pcm_std_chmaps);
2410
2411/* alternative channel maps with CLFE <-> surround swapped for 6/8 channels */
2412const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[] = {
2413 { .channels = 1,
2414 .map = { SNDRV_CHMAP_MONO } },
2415 { .channels = 2,
2416 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
2417 { .channels = 4,
2418 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2419 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2420 { .channels = 6,
2421 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2422 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2423 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2424 { .channels = 8,
2425 .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2426 SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2427 SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2428 SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
2429 { }
2430};
2431EXPORT_SYMBOL_GPL(snd_pcm_alt_chmaps);
2432
2433static bool valid_chmap_channels(const struct snd_pcm_chmap *info, int ch)
2434{
2435 if (ch > info->max_channels)
2436 return false;
2437 return !info->channel_mask || (info->channel_mask & (1U << ch));
2438}
2439
2440static int pcm_chmap_ctl_info(struct snd_kcontrol *kcontrol,
2441 struct snd_ctl_elem_info *uinfo)
2442{
2443 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2444
2445 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
2446 uinfo->count = 0;
2447 uinfo->count = info->max_channels;
2448 uinfo->value.integer.min = 0;
2449 uinfo->value.integer.max = SNDRV_CHMAP_LAST;
2450 return 0;
2451}
2452
2453/* get callback for channel map ctl element
2454 * stores the channel position firstly matching with the current channels
2455 */
2456static int pcm_chmap_ctl_get(struct snd_kcontrol *kcontrol,
2457 struct snd_ctl_elem_value *ucontrol)
2458{
2459 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2460 unsigned int idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);
2461 struct snd_pcm_substream *substream;
2462 const struct snd_pcm_chmap_elem *map;
2463
2464 if (snd_BUG_ON(!info->chmap))
2465 return -EINVAL;
2466 substream = snd_pcm_chmap_substream(info, idx);
2467 if (!substream)
2468 return -ENODEV;
2469 memset(ucontrol->value.integer.value, 0,
2470 sizeof(ucontrol->value.integer.value));
2471 if (!substream->runtime)
2472 return 0; /* no channels set */
2473 for (map = info->chmap; map->channels; map++) {
2474 int i;
2475 if (map->channels == substream->runtime->channels &&
2476 valid_chmap_channels(info, map->channels)) {
2477 for (i = 0; i < map->channels; i++)
2478 ucontrol->value.integer.value[i] = map->map[i];
2479 return 0;
2480 }
2481 }
2482 return -EINVAL;
2483}
2484
2485/* tlv callback for channel map ctl element
2486 * expands the pre-defined channel maps in a form of TLV
2487 */
2488static int pcm_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
2489 unsigned int size, unsigned int __user *tlv)
2490{
2491 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2492 const struct snd_pcm_chmap_elem *map;
2493 unsigned int __user *dst;
2494 int c, count = 0;
2495
2496 if (snd_BUG_ON(!info->chmap))
2497 return -EINVAL;
2498 if (size < 8)
2499 return -ENOMEM;
2500 if (put_user(SNDRV_CTL_TLVT_CONTAINER, tlv))
2501 return -EFAULT;
2502 size -= 8;
2503 dst = tlv + 2;
2504 for (map = info->chmap; map->channels; map++) {
2505 int chs_bytes = map->channels * 4;
2506 if (!valid_chmap_channels(info, map->channels))
2507 continue;
2508 if (size < 8)
2509 return -ENOMEM;
2510 if (put_user(SNDRV_CTL_TLVT_CHMAP_FIXED, dst) ||
2511 put_user(chs_bytes, dst + 1))
2512 return -EFAULT;
2513 dst += 2;
2514 size -= 8;
2515 count += 8;
2516 if (size < chs_bytes)
2517 return -ENOMEM;
2518 size -= chs_bytes;
2519 count += chs_bytes;
2520 for (c = 0; c < map->channels; c++) {
2521 if (put_user(map->map[c], dst))
2522 return -EFAULT;
2523 dst++;
2524 }
2525 }
2526 if (put_user(count, tlv + 1))
2527 return -EFAULT;
2528 return 0;
2529}
2530
2531static void pcm_chmap_ctl_private_free(struct snd_kcontrol *kcontrol)
2532{
2533 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2534 info->pcm->streams[info->stream].chmap_kctl = NULL;
2535 kfree(info);
2536}
2537
2538/**
2539 * snd_pcm_add_chmap_ctls - create channel-mapping control elements
2540 * @pcm: the assigned PCM instance
2541 * @stream: stream direction
2542 * @chmap: channel map elements (for query)
2543 * @max_channels: the max number of channels for the stream
2544 * @private_value: the value passed to each kcontrol's private_value field
2545 * @info_ret: store struct snd_pcm_chmap instance if non-NULL
2546 *
2547 * Create channel-mapping control elements assigned to the given PCM stream(s).
2548 * Return: Zero if successful, or a negative error value.
2549 */
2550int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
2551 const struct snd_pcm_chmap_elem *chmap,
2552 int max_channels,
2553 unsigned long private_value,
2554 struct snd_pcm_chmap **info_ret)
2555{
2556 struct snd_pcm_chmap *info;
2557 struct snd_kcontrol_new knew = {
2558 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
2559 .access = SNDRV_CTL_ELEM_ACCESS_READ |
2560 SNDRV_CTL_ELEM_ACCESS_TLV_READ |
2561 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK,
2562 .info = pcm_chmap_ctl_info,
2563 .get = pcm_chmap_ctl_get,
2564 .tlv.c = pcm_chmap_ctl_tlv,
2565 };
2566 int err;
2567
2568 info = kzalloc(sizeof(*info), GFP_KERNEL);
2569 if (!info)
2570 return -ENOMEM;
2571 info->pcm = pcm;
2572 info->stream = stream;
2573 info->chmap = chmap;
2574 info->max_channels = max_channels;
2575 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
2576 knew.name = "Playback Channel Map";
2577 else
2578 knew.name = "Capture Channel Map";
2579 knew.device = pcm->device;
2580 knew.count = pcm->streams[stream].substream_count;
2581 knew.private_value = private_value;
2582 info->kctl = snd_ctl_new1(&knew, info);
2583 if (!info->kctl) {
2584 kfree(info);
2585 return -ENOMEM;
2586 }
2587 info->kctl->private_free = pcm_chmap_ctl_private_free;
2588 err = snd_ctl_add(pcm->card, info->kctl);
2589 if (err < 0)
2590 return err;
2591 pcm->streams[stream].chmap_kctl = info->kctl;
2592 if (info_ret)
2593 *info_ret = info;
2594 return 0;
2595}
2596EXPORT_SYMBOL_GPL(snd_pcm_add_chmap_ctls);