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