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xen: cleancache shim to Xen Transcendent Memory
[linux-2.6/next.git] / sound / core / pcm_lib.c
blob64449cb8f873774a91eb836973c1ab0a1ad2d9b8
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 <sound/core.h>
27 #include <sound/control.h>
28 #include <sound/info.h>
29 #include <sound/pcm.h>
30 #include <sound/pcm_params.h>
31 #include <sound/timer.h>
32
33 /*
34 * fill ring buffer with silence
35 * runtime->silence_start: starting pointer to silence area
36 * runtime->silence_filled: size filled with silence
37 * runtime->silence_threshold: threshold from application
38 * runtime->silence_size: maximal size from application
39 *
40 * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately
41 */
42 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr)
43 {
44 struct snd_pcm_runtime *runtime = substream->runtime;
45 snd_pcm_uframes_t frames, ofs, transfer;
46
47 if (runtime->silence_size < runtime->boundary) {
48 snd_pcm_sframes_t noise_dist, n;
49 if (runtime->silence_start != runtime->control->appl_ptr) {
50 n = runtime->control->appl_ptr - runtime->silence_start;
51 if (n < 0)
52 n += runtime->boundary;
53 if ((snd_pcm_uframes_t)n < runtime->silence_filled)
54 runtime->silence_filled -= n;
55 else
56 runtime->silence_filled = 0;
57 runtime->silence_start = runtime->control->appl_ptr;
58 }
59 if (runtime->silence_filled >= runtime->buffer_size)
60 return;
61 noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
62 if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold)
63 return;
64 frames = runtime->silence_threshold - noise_dist;
65 if (frames > runtime->silence_size)
66 frames = runtime->silence_size;
67 } else {
68 if (new_hw_ptr == ULONG_MAX) { /* initialization */
69 snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime);
70 if (avail > runtime->buffer_size)
71 avail = runtime->buffer_size;
72 runtime->silence_filled = avail > 0 ? avail : 0;
73 runtime->silence_start = (runtime->status->hw_ptr +
74 runtime->silence_filled) %
75 runtime->boundary;
76 } else {
77 ofs = runtime->status->hw_ptr;
78 frames = new_hw_ptr - ofs;
79 if ((snd_pcm_sframes_t)frames < 0)
80 frames += runtime->boundary;
81 runtime->silence_filled -= frames;
82 if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
83 runtime->silence_filled = 0;
84 runtime->silence_start = new_hw_ptr;
85 } else {
86 runtime->silence_start = ofs;
87 }
88 }
89 frames = runtime->buffer_size - runtime->silence_filled;
90 }
91 if (snd_BUG_ON(frames > runtime->buffer_size))
92 return;
93 if (frames == 0)
94 return;
95 ofs = runtime->silence_start % runtime->buffer_size;
96 while (frames > 0) {
97 transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
98 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
99 runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) {
100 if (substream->ops->silence) {
101 int err;
102 err = substream->ops->silence(substream, -1, ofs, transfer);
103 snd_BUG_ON(err < 0);
104 } else {
105 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs);
106 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels);
107 }
108 } else {
109 unsigned int c;
110 unsigned int channels = runtime->channels;
111 if (substream->ops->silence) {
112 for (c = 0; c < channels; ++c) {
113 int err;
114 err = substream->ops->silence(substream, c, ofs, transfer);
115 snd_BUG_ON(err < 0);
116 }
117 } else {
118 size_t dma_csize = runtime->dma_bytes / channels;
119 for (c = 0; c < channels; ++c) {
120 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs);
121 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer);
122 }
123 }
124 }
125 runtime->silence_filled += transfer;
126 frames -= transfer;
127 ofs = 0;
128 }
129 }
130
131 static void pcm_debug_name(struct snd_pcm_substream *substream,
132 char *name, size_t len)
133 {
134 snprintf(name, len, "pcmC%dD%d%c:%d",
135 substream->pcm->card->number,
136 substream->pcm->device,
137 substream->stream ? 'c' : 'p',
138 substream->number);
139 }
140
141 #define XRUN_DEBUG_BASIC (1<<0)
142 #define XRUN_DEBUG_STACK (1<<1) /* dump also stack */
143 #define XRUN_DEBUG_JIFFIESCHECK (1<<2) /* do jiffies check */
144 #define XRUN_DEBUG_PERIODUPDATE (1<<3) /* full period update info */
145 #define XRUN_DEBUG_HWPTRUPDATE (1<<4) /* full hwptr update info */
146 #define XRUN_DEBUG_LOG (1<<5) /* show last 10 positions on err */
147 #define XRUN_DEBUG_LOGONCE (1<<6) /* do above only once */
148
149 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
150
151 #define xrun_debug(substream, mask) \
152 ((substream)->pstr->xrun_debug & (mask))
153 #else
154 #define xrun_debug(substream, mask) 0
155 #endif
156
157 #define dump_stack_on_xrun(substream) do { \
158 if (xrun_debug(substream, XRUN_DEBUG_STACK)) \
159 dump_stack(); \
160 } while (0)
161
162 static void xrun(struct snd_pcm_substream *substream)
163 {
164 struct snd_pcm_runtime *runtime = substream->runtime;
165
166 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
167 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
168 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
169 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {
170 char name[16];
171 pcm_debug_name(substream, name, sizeof(name));
172 snd_printd(KERN_DEBUG "XRUN: %s\n", name);
173 dump_stack_on_xrun(substream);
174 }
175 }
176
177 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
178 #define hw_ptr_error(substream, fmt, args...) \
179 do { \
180 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { \
181 xrun_log_show(substream); \
182 if (printk_ratelimit()) { \
183 snd_printd("PCM: " fmt, ##args); \
184 } \
185 dump_stack_on_xrun(substream); \
186 } \
187 } while (0)
188
189 #define XRUN_LOG_CNT 10
190
191 struct hwptr_log_entry {
192 unsigned long jiffies;
193 snd_pcm_uframes_t pos;
194 snd_pcm_uframes_t period_size;
195 snd_pcm_uframes_t buffer_size;
196 snd_pcm_uframes_t old_hw_ptr;
197 snd_pcm_uframes_t hw_ptr_base;
198 };
199
200 struct snd_pcm_hwptr_log {
201 unsigned int idx;
202 unsigned int hit: 1;
203 struct hwptr_log_entry entries[XRUN_LOG_CNT];
204 };
205
206 static void xrun_log(struct snd_pcm_substream *substream,
207 snd_pcm_uframes_t pos)
208 {
209 struct snd_pcm_runtime *runtime = substream->runtime;
210 struct snd_pcm_hwptr_log *log = runtime->hwptr_log;
211 struct hwptr_log_entry *entry;
212
213 if (log == NULL) {
214 log = kzalloc(sizeof(*log), GFP_ATOMIC);
215 if (log == NULL)
216 return;
217 runtime->hwptr_log = log;
218 } else {
219 if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
220 return;
221 }
222 entry = &log->entries[log->idx];
223 entry->jiffies = jiffies;
224 entry->pos = pos;
225 entry->period_size = runtime->period_size;
226 entry->buffer_size = runtime->buffer_size;
227 entry->old_hw_ptr = runtime->status->hw_ptr;
228 entry->hw_ptr_base = runtime->hw_ptr_base;
229 log->idx = (log->idx + 1) % XRUN_LOG_CNT;
230 }
231
232 static void xrun_log_show(struct snd_pcm_substream *substream)
233 {
234 struct snd_pcm_hwptr_log *log = substream->runtime->hwptr_log;
235 struct hwptr_log_entry *entry;
236 char name[16];
237 unsigned int idx;
238 int cnt;
239
240 if (log == NULL)
241 return;
242 if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
243 return;
244 pcm_debug_name(substream, name, sizeof(name));
245 for (cnt = 0, idx = log->idx; cnt < XRUN_LOG_CNT; cnt++) {
246 entry = &log->entries[idx];
247 if (entry->period_size == 0)
248 break;
249 snd_printd("hwptr log: %s: j=%lu, pos=%ld/%ld/%ld, "
250 "hwptr=%ld/%ld\n",
251 name, entry->jiffies, (unsigned long)entry->pos,
252 (unsigned long)entry->period_size,
253 (unsigned long)entry->buffer_size,
254 (unsigned long)entry->old_hw_ptr,
255 (unsigned long)entry->hw_ptr_base);
256 idx++;
257 idx %= XRUN_LOG_CNT;
258 }
259 log->hit = 1;
260 }
261
262 #else /* ! CONFIG_SND_PCM_XRUN_DEBUG */
263
264 #define hw_ptr_error(substream, fmt, args...) do { } while (0)
265 #define xrun_log(substream, pos) do { } while (0)
266 #define xrun_log_show(substream) do { } while (0)
267
268 #endif
269
270 int snd_pcm_update_state(struct snd_pcm_substream *substream,
271 struct snd_pcm_runtime *runtime)
272 {
273 snd_pcm_uframes_t avail;
274
275 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
276 avail = snd_pcm_playback_avail(runtime);
277 else
278 avail = snd_pcm_capture_avail(runtime);
279 if (avail > runtime->avail_max)
280 runtime->avail_max = avail;
281 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
282 if (avail >= runtime->buffer_size) {
283 snd_pcm_drain_done(substream);
284 return -EPIPE;
285 }
286 } else {
287 if (avail >= runtime->stop_threshold) {
288 xrun(substream);
289 return -EPIPE;
290 }
291 }
292 if (runtime->twake) {
293 if (avail >= runtime->twake)
294 wake_up(&runtime->tsleep);
295 } else if (avail >= runtime->control->avail_min)
296 wake_up(&runtime->sleep);
297 return 0;
298 }
299
300 static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
301 unsigned int in_interrupt)
302 {
303 struct snd_pcm_runtime *runtime = substream->runtime;
304 snd_pcm_uframes_t pos;
305 snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
306 snd_pcm_sframes_t hdelta, delta;
307 unsigned long jdelta;
308
309 old_hw_ptr = runtime->status->hw_ptr;
310 pos = substream->ops->pointer(substream);
311 if (pos == SNDRV_PCM_POS_XRUN) {
312 xrun(substream);
313 return -EPIPE;
314 }
315 if (pos >= runtime->buffer_size) {
316 if (printk_ratelimit()) {
317 char name[16];
318 pcm_debug_name(substream, name, sizeof(name));
319 xrun_log_show(substream);
320 snd_printd(KERN_ERR "BUG: %s, pos = %ld, "
321 "buffer size = %ld, period size = %ld\n",
322 name, pos, runtime->buffer_size,
323 runtime->period_size);
324 }
325 pos = 0;
326 }
327 pos -= pos % runtime->min_align;
328 if (xrun_debug(substream, XRUN_DEBUG_LOG))
329 xrun_log(substream, pos);
330 hw_base = runtime->hw_ptr_base;
331 new_hw_ptr = hw_base + pos;
332 if (in_interrupt) {
333 /* we know that one period was processed */
334 /* delta = "expected next hw_ptr" for in_interrupt != 0 */
335 delta = runtime->hw_ptr_interrupt + runtime->period_size;
336 if (delta > new_hw_ptr) {
337 /* check for double acknowledged interrupts */
338 hdelta = jiffies - runtime->hw_ptr_jiffies;
339 if (hdelta > runtime->hw_ptr_buffer_jiffies/2) {
340 hw_base += runtime->buffer_size;
341 if (hw_base >= runtime->boundary)
342 hw_base = 0;
343 new_hw_ptr = hw_base + pos;
344 goto __delta;
345 }
346 }
347 }
348 /* new_hw_ptr might be lower than old_hw_ptr in case when */
349 /* pointer crosses the end of the ring buffer */
350 if (new_hw_ptr < old_hw_ptr) {
351 hw_base += runtime->buffer_size;
352 if (hw_base >= runtime->boundary)
353 hw_base = 0;
354 new_hw_ptr = hw_base + pos;
355 }
356 __delta:
357 delta = new_hw_ptr - old_hw_ptr;
358 if (delta < 0)
359 delta += runtime->boundary;
360 if (xrun_debug(substream, in_interrupt ?
361 XRUN_DEBUG_PERIODUPDATE : XRUN_DEBUG_HWPTRUPDATE)) {
362 char name[16];
363 pcm_debug_name(substream, name, sizeof(name));
364 snd_printd("%s_update: %s: pos=%u/%u/%u, "
365 "hwptr=%ld/%ld/%ld/%ld\n",
366 in_interrupt ? "period" : "hwptr",
367 name,
368 (unsigned int)pos,
369 (unsigned int)runtime->period_size,
370 (unsigned int)runtime->buffer_size,
371 (unsigned long)delta,
372 (unsigned long)old_hw_ptr,
373 (unsigned long)new_hw_ptr,
374 (unsigned long)runtime->hw_ptr_base);
375 }
376
377 if (runtime->no_period_wakeup) {
378 snd_pcm_sframes_t xrun_threshold;
379 /*
380 * Without regular period interrupts, we have to check
381 * the elapsed time to detect xruns.
382 */
383 jdelta = jiffies - runtime->hw_ptr_jiffies;
384 if (jdelta < runtime->hw_ptr_buffer_jiffies / 2)
385 goto no_delta_check;
386 hdelta = jdelta - delta * HZ / runtime->rate;
387 xrun_threshold = runtime->hw_ptr_buffer_jiffies / 2 + 1;
388 while (hdelta > xrun_threshold) {
389 delta += runtime->buffer_size;
390 hw_base += runtime->buffer_size;
391 if (hw_base >= runtime->boundary)
392 hw_base = 0;
393 new_hw_ptr = hw_base + pos;
394 hdelta -= runtime->hw_ptr_buffer_jiffies;
395 }
396 goto no_delta_check;
397 }
398
399 /* something must be really wrong */
400 if (delta >= runtime->buffer_size + runtime->period_size) {
401 hw_ptr_error(substream,
402 "Unexpected hw_pointer value %s"
403 "(stream=%i, pos=%ld, new_hw_ptr=%ld, "
404 "old_hw_ptr=%ld)\n",
405 in_interrupt ? "[Q] " : "[P]",
406 substream->stream, (long)pos,
407 (long)new_hw_ptr, (long)old_hw_ptr);
408 return 0;
409 }
410
411 /* Do jiffies check only in xrun_debug mode */
412 if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
413 goto no_jiffies_check;
414
415 /* Skip the jiffies check for hardwares with BATCH flag.
416 * Such hardware usually just increases the position at each IRQ,
417 * thus it can't give any strange position.
418 */
419 if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
420 goto no_jiffies_check;
421 hdelta = delta;
422 if (hdelta < runtime->delay)
423 goto no_jiffies_check;
424 hdelta -= runtime->delay;
425 jdelta = jiffies - runtime->hw_ptr_jiffies;
426 if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
427 delta = jdelta /
428 (((runtime->period_size * HZ) / runtime->rate)
429 + HZ/100);
430 /* move new_hw_ptr according jiffies not pos variable */
431 new_hw_ptr = old_hw_ptr;
432 hw_base = delta;
433 /* use loop to avoid checks for delta overflows */
434 /* the delta value is small or zero in most cases */
435 while (delta > 0) {
436 new_hw_ptr += runtime->period_size;
437 if (new_hw_ptr >= runtime->boundary)
438 new_hw_ptr -= runtime->boundary;
439 delta--;
440 }
441 /* align hw_base to buffer_size */
442 hw_ptr_error(substream,
443 "hw_ptr skipping! %s"
444 "(pos=%ld, delta=%ld, period=%ld, "
445 "jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
446 in_interrupt ? "[Q] " : "",
447 (long)pos, (long)hdelta,
448 (long)runtime->period_size, jdelta,
449 ((hdelta * HZ) / runtime->rate), hw_base,
450 (unsigned long)old_hw_ptr,
451 (unsigned long)new_hw_ptr);
452 /* reset values to proper state */
453 delta = 0;
454 hw_base = new_hw_ptr - (new_hw_ptr % runtime->buffer_size);
455 }
456 no_jiffies_check:
457 if (delta > runtime->period_size + runtime->period_size / 2) {
458 hw_ptr_error(substream,
459 "Lost interrupts? %s"
460 "(stream=%i, delta=%ld, new_hw_ptr=%ld, "
461 "old_hw_ptr=%ld)\n",
462 in_interrupt ? "[Q] " : "",
463 substream->stream, (long)delta,
464 (long)new_hw_ptr,
465 (long)old_hw_ptr);
466 }
467
468 no_delta_check:
469 if (runtime->status->hw_ptr == new_hw_ptr)
470 return 0;
471
472 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
473 runtime->silence_size > 0)
474 snd_pcm_playback_silence(substream, new_hw_ptr);
475
476 if (in_interrupt) {
477 delta = new_hw_ptr - runtime->hw_ptr_interrupt;
478 if (delta < 0)
479 delta += runtime->boundary;
480 delta -= (snd_pcm_uframes_t)delta % runtime->period_size;
481 runtime->hw_ptr_interrupt += delta;
482 if (runtime->hw_ptr_interrupt >= runtime->boundary)
483 runtime->hw_ptr_interrupt -= runtime->boundary;
484 }
485 runtime->hw_ptr_base = hw_base;
486 runtime->status->hw_ptr = new_hw_ptr;
487 runtime->hw_ptr_jiffies = jiffies;
488 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
489 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
490
491 return snd_pcm_update_state(substream, runtime);
492 }
493
494 /* CAUTION: call it with irq disabled */
495 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
496 {
497 return snd_pcm_update_hw_ptr0(substream, 0);
498 }
499
500 /**
501 * snd_pcm_set_ops - set the PCM operators
502 * @pcm: the pcm instance
503 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
504 * @ops: the operator table
505 *
506 * Sets the given PCM operators to the pcm instance.
507 */
508 void snd_pcm_set_ops(struct snd_pcm *pcm, int direction, struct snd_pcm_ops *ops)
509 {
510 struct snd_pcm_str *stream = &pcm->streams[direction];
511 struct snd_pcm_substream *substream;
512
513 for (substream = stream->substream; substream != NULL; substream = substream->next)
514 substream->ops = ops;
515 }
516
517 EXPORT_SYMBOL(snd_pcm_set_ops);
518
519 /**
520 * snd_pcm_sync - set the PCM sync id
521 * @substream: the pcm substream
522 *
523 * Sets the PCM sync identifier for the card.
524 */
525 void snd_pcm_set_sync(struct snd_pcm_substream *substream)
526 {
527 struct snd_pcm_runtime *runtime = substream->runtime;
528
529 runtime->sync.id32[0] = substream->pcm->card->number;
530 runtime->sync.id32[1] = -1;
531 runtime->sync.id32[2] = -1;
532 runtime->sync.id32[3] = -1;
533 }
534
535 EXPORT_SYMBOL(snd_pcm_set_sync);
536
537 /*
538 * Standard ioctl routine
539 */
540
541 static inline unsigned int div32(unsigned int a, unsigned int b,
542 unsigned int *r)
543 {
544 if (b == 0) {
545 *r = 0;
546 return UINT_MAX;
547 }
548 *r = a % b;
549 return a / b;
550 }
551
552 static inline unsigned int div_down(unsigned int a, unsigned int b)
553 {
554 if (b == 0)
555 return UINT_MAX;
556 return a / b;
557 }
558
559 static inline unsigned int div_up(unsigned int a, unsigned int b)
560 {
561 unsigned int r;
562 unsigned int q;
563 if (b == 0)
564 return UINT_MAX;
565 q = div32(a, b, &r);
566 if (r)
567 ++q;
568 return q;
569 }
570
571 static inline unsigned int mul(unsigned int a, unsigned int b)
572 {
573 if (a == 0)
574 return 0;
575 if (div_down(UINT_MAX, a) < b)
576 return UINT_MAX;
577 return a * b;
578 }
579
580 static inline unsigned int muldiv32(unsigned int a, unsigned int b,
581 unsigned int c, unsigned int *r)
582 {
583 u_int64_t n = (u_int64_t) a * b;
584 if (c == 0) {
585 snd_BUG_ON(!n);
586 *r = 0;
587 return UINT_MAX;
588 }
589 n = div_u64_rem(n, c, r);
590 if (n >= UINT_MAX) {
591 *r = 0;
592 return UINT_MAX;
593 }
594 return n;
595 }
596
597 /**
598 * snd_interval_refine - refine the interval value of configurator
599 * @i: the interval value to refine
600 * @v: the interval value to refer to
601 *
602 * Refines the interval value with the reference value.
603 * The interval is changed to the range satisfying both intervals.
604 * The interval status (min, max, integer, etc.) are evaluated.
605 *
606 * Returns non-zero if the value is changed, zero if not changed.
607 */
608 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
609 {
610 int changed = 0;
611 if (snd_BUG_ON(snd_interval_empty(i)))
612 return -EINVAL;
613 if (i->min < v->min) {
614 i->min = v->min;
615 i->openmin = v->openmin;
616 changed = 1;
617 } else if (i->min == v->min && !i->openmin && v->openmin) {
618 i->openmin = 1;
619 changed = 1;
620 }
621 if (i->max > v->max) {
622 i->max = v->max;
623 i->openmax = v->openmax;
624 changed = 1;
625 } else if (i->max == v->max && !i->openmax && v->openmax) {
626 i->openmax = 1;
627 changed = 1;
628 }
629 if (!i->integer && v->integer) {
630 i->integer = 1;
631 changed = 1;
632 }
633 if (i->integer) {
634 if (i->openmin) {
635 i->min++;
636 i->openmin = 0;
637 }
638 if (i->openmax) {
639 i->max--;
640 i->openmax = 0;
641 }
642 } else if (!i->openmin && !i->openmax && i->min == i->max)
643 i->integer = 1;
644 if (snd_interval_checkempty(i)) {
645 snd_interval_none(i);
646 return -EINVAL;
647 }
648 return changed;
649 }
650
651 EXPORT_SYMBOL(snd_interval_refine);
652
653 static int snd_interval_refine_first(struct snd_interval *i)
654 {
655 if (snd_BUG_ON(snd_interval_empty(i)))
656 return -EINVAL;
657 if (snd_interval_single(i))
658 return 0;
659 i->max = i->min;
660 i->openmax = i->openmin;
661 if (i->openmax)
662 i->max++;
663 return 1;
664 }
665
666 static int snd_interval_refine_last(struct snd_interval *i)
667 {
668 if (snd_BUG_ON(snd_interval_empty(i)))
669 return -EINVAL;
670 if (snd_interval_single(i))
671 return 0;
672 i->min = i->max;
673 i->openmin = i->openmax;
674 if (i->openmin)
675 i->min--;
676 return 1;
677 }
678
679 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
680 {
681 if (a->empty || b->empty) {
682 snd_interval_none(c);
683 return;
684 }
685 c->empty = 0;
686 c->min = mul(a->min, b->min);
687 c->openmin = (a->openmin || b->openmin);
688 c->max = mul(a->max, b->max);
689 c->openmax = (a->openmax || b->openmax);
690 c->integer = (a->integer && b->integer);
691 }
692
693 /**
694 * snd_interval_div - refine the interval value with division
695 * @a: dividend
696 * @b: divisor
697 * @c: quotient
698 *
699 * c = a / b
700 *
701 * Returns non-zero if the value is changed, zero if not changed.
702 */
703 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
704 {
705 unsigned int r;
706 if (a->empty || b->empty) {
707 snd_interval_none(c);
708 return;
709 }
710 c->empty = 0;
711 c->min = div32(a->min, b->max, &r);
712 c->openmin = (r || a->openmin || b->openmax);
713 if (b->min > 0) {
714 c->max = div32(a->max, b->min, &r);
715 if (r) {
716 c->max++;
717 c->openmax = 1;
718 } else
719 c->openmax = (a->openmax || b->openmin);
720 } else {
721 c->max = UINT_MAX;
722 c->openmax = 0;
723 }
724 c->integer = 0;
725 }
726
727 /**
728 * snd_interval_muldivk - refine the interval value
729 * @a: dividend 1
730 * @b: dividend 2
731 * @k: divisor (as integer)
732 * @c: result
733 *
734 * c = a * b / k
735 *
736 * Returns non-zero if the value is changed, zero if not changed.
737 */
738 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
739 unsigned int k, struct snd_interval *c)
740 {
741 unsigned int r;
742 if (a->empty || b->empty) {
743 snd_interval_none(c);
744 return;
745 }
746 c->empty = 0;
747 c->min = muldiv32(a->min, b->min, k, &r);
748 c->openmin = (r || a->openmin || b->openmin);
749 c->max = muldiv32(a->max, b->max, k, &r);
750 if (r) {
751 c->max++;
752 c->openmax = 1;
753 } else
754 c->openmax = (a->openmax || b->openmax);
755 c->integer = 0;
756 }
757
758 /**
759 * snd_interval_mulkdiv - refine the interval value
760 * @a: dividend 1
761 * @k: dividend 2 (as integer)
762 * @b: divisor
763 * @c: result
764 *
765 * c = a * k / b
766 *
767 * Returns non-zero if the value is changed, zero if not changed.
768 */
769 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
770 const struct snd_interval *b, struct snd_interval *c)
771 {
772 unsigned int r;
773 if (a->empty || b->empty) {
774 snd_interval_none(c);
775 return;
776 }
777 c->empty = 0;
778 c->min = muldiv32(a->min, k, b->max, &r);
779 c->openmin = (r || a->openmin || b->openmax);
780 if (b->min > 0) {
781 c->max = muldiv32(a->max, k, b->min, &r);
782 if (r) {
783 c->max++;
784 c->openmax = 1;
785 } else
786 c->openmax = (a->openmax || b->openmin);
787 } else {
788 c->max = UINT_MAX;
789 c->openmax = 0;
790 }
791 c->integer = 0;
792 }
793
794 /* ---- */
795
796
797 /**
798 * snd_interval_ratnum - refine the interval value
799 * @i: interval to refine
800 * @rats_count: number of ratnum_t
801 * @rats: ratnum_t array
802 * @nump: pointer to store the resultant numerator
803 * @denp: pointer to store the resultant denominator
804 *
805 * Returns non-zero if the value is changed, zero if not changed.
806 */
807 int snd_interval_ratnum(struct snd_interval *i,
808 unsigned int rats_count, struct snd_ratnum *rats,
809 unsigned int *nump, unsigned int *denp)
810 {
811 unsigned int best_num, best_den;
812 int best_diff;
813 unsigned int k;
814 struct snd_interval t;
815 int err;
816 unsigned int result_num, result_den;
817 int result_diff;
818
819 best_num = best_den = best_diff = 0;
820 for (k = 0; k < rats_count; ++k) {
821 unsigned int num = rats[k].num;
822 unsigned int den;
823 unsigned int q = i->min;
824 int diff;
825 if (q == 0)
826 q = 1;
827 den = div_up(num, q);
828 if (den < rats[k].den_min)
829 continue;
830 if (den > rats[k].den_max)
831 den = rats[k].den_max;
832 else {
833 unsigned int r;
834 r = (den - rats[k].den_min) % rats[k].den_step;
835 if (r != 0)
836 den -= r;
837 }
838 diff = num - q * den;
839 if (diff < 0)
840 diff = -diff;
841 if (best_num == 0 ||
842 diff * best_den < best_diff * den) {
843 best_diff = diff;
844 best_den = den;
845 best_num = num;
846 }
847 }
848 if (best_den == 0) {
849 i->empty = 1;
850 return -EINVAL;
851 }
852 t.min = div_down(best_num, best_den);
853 t.openmin = !!(best_num % best_den);
854
855 result_num = best_num;
856 result_diff = best_diff;
857 result_den = best_den;
858 best_num = best_den = best_diff = 0;
859 for (k = 0; k < rats_count; ++k) {
860 unsigned int num = rats[k].num;
861 unsigned int den;
862 unsigned int q = i->max;
863 int diff;
864 if (q == 0) {
865 i->empty = 1;
866 return -EINVAL;
867 }
868 den = div_down(num, q);
869 if (den > rats[k].den_max)
870 continue;
871 if (den < rats[k].den_min)
872 den = rats[k].den_min;
873 else {
874 unsigned int r;
875 r = (den - rats[k].den_min) % rats[k].den_step;
876 if (r != 0)
877 den += rats[k].den_step - r;
878 }
879 diff = q * den - num;
880 if (diff < 0)
881 diff = -diff;
882 if (best_num == 0 ||
883 diff * best_den < best_diff * den) {
884 best_diff = diff;
885 best_den = den;
886 best_num = num;
887 }
888 }
889 if (best_den == 0) {
890 i->empty = 1;
891 return -EINVAL;
892 }
893 t.max = div_up(best_num, best_den);
894 t.openmax = !!(best_num % best_den);
895 t.integer = 0;
896 err = snd_interval_refine(i, &t);
897 if (err < 0)
898 return err;
899
900 if (snd_interval_single(i)) {
901 if (best_diff * result_den < result_diff * best_den) {
902 result_num = best_num;
903 result_den = best_den;
904 }
905 if (nump)
906 *nump = result_num;
907 if (denp)
908 *denp = result_den;
909 }
910 return err;
911 }
912
913 EXPORT_SYMBOL(snd_interval_ratnum);
914
915 /**
916 * snd_interval_ratden - refine the interval value
917 * @i: interval to refine
918 * @rats_count: number of struct ratden
919 * @rats: struct ratden array
920 * @nump: pointer to store the resultant numerator
921 * @denp: pointer to store the resultant denominator
922 *
923 * Returns non-zero if the value is changed, zero if not changed.
924 */
925 static int snd_interval_ratden(struct snd_interval *i,
926 unsigned int rats_count, struct snd_ratden *rats,
927 unsigned int *nump, unsigned int *denp)
928 {
929 unsigned int best_num, best_diff, best_den;
930 unsigned int k;
931 struct snd_interval t;
932 int err;
933
934 best_num = best_den = best_diff = 0;
935 for (k = 0; k < rats_count; ++k) {
936 unsigned int num;
937 unsigned int den = rats[k].den;
938 unsigned int q = i->min;
939 int diff;
940 num = mul(q, den);
941 if (num > rats[k].num_max)
942 continue;
943 if (num < rats[k].num_min)
944 num = rats[k].num_max;
945 else {
946 unsigned int r;
947 r = (num - rats[k].num_min) % rats[k].num_step;
948 if (r != 0)
949 num += rats[k].num_step - r;
950 }
951 diff = num - q * den;
952 if (best_num == 0 ||
953 diff * best_den < best_diff * den) {
954 best_diff = diff;
955 best_den = den;
956 best_num = num;
957 }
958 }
959 if (best_den == 0) {
960 i->empty = 1;
961 return -EINVAL;
962 }
963 t.min = div_down(best_num, best_den);
964 t.openmin = !!(best_num % best_den);
965
966 best_num = best_den = best_diff = 0;
967 for (k = 0; k < rats_count; ++k) {
968 unsigned int num;
969 unsigned int den = rats[k].den;
970 unsigned int q = i->max;
971 int diff;
972 num = mul(q, den);
973 if (num < rats[k].num_min)
974 continue;
975 if (num > rats[k].num_max)
976 num = rats[k].num_max;
977 else {
978 unsigned int r;
979 r = (num - rats[k].num_min) % rats[k].num_step;
980 if (r != 0)
981 num -= r;
982 }
983 diff = q * den - num;
984 if (best_num == 0 ||
985 diff * best_den < best_diff * den) {
986 best_diff = diff;
987 best_den = den;
988 best_num = num;
989 }
990 }
991 if (best_den == 0) {
992 i->empty = 1;
993 return -EINVAL;
994 }
995 t.max = div_up(best_num, best_den);
996 t.openmax = !!(best_num % best_den);
997 t.integer = 0;
998 err = snd_interval_refine(i, &t);
999 if (err < 0)
1000 return err;
1001
1002 if (snd_interval_single(i)) {
1003 if (nump)
1004 *nump = best_num;
1005 if (denp)
1006 *denp = best_den;
1007 }
1008 return err;
1009 }
1010
1011 /**
1012 * snd_interval_list - refine the interval value from the list
1013 * @i: the interval value to refine
1014 * @count: the number of elements in the list
1015 * @list: the value list
1016 * @mask: the bit-mask to evaluate
1017 *
1018 * Refines the interval value from the list.
1019 * When mask is non-zero, only the elements corresponding to bit 1 are
1020 * evaluated.
1021 *
1022 * Returns non-zero if the value is changed, zero if not changed.
1023 */
1024 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask)
1025 {
1026 unsigned int k;
1027 struct snd_interval list_range;
1028
1029 if (!count) {
1030 i->empty = 1;
1031 return -EINVAL;
1032 }
1033 snd_interval_any(&list_range);
1034 list_range.min = UINT_MAX;
1035 list_range.max = 0;
1036 for (k = 0; k < count; k++) {
1037 if (mask && !(mask & (1 << k)))
1038 continue;
1039 if (!snd_interval_test(i, list[k]))
1040 continue;
1041 list_range.min = min(list_range.min, list[k]);
1042 list_range.max = max(list_range.max, list[k]);
1043 }
1044 return snd_interval_refine(i, &list_range);
1045 }
1046
1047 EXPORT_SYMBOL(snd_interval_list);
1048
1049 static int snd_interval_step(struct snd_interval *i, unsigned int min, unsigned int step)
1050 {
1051 unsigned int n;
1052 int changed = 0;
1053 n = (i->min - min) % step;
1054 if (n != 0 || i->openmin) {
1055 i->min += step - n;
1056 changed = 1;
1057 }
1058 n = (i->max - min) % step;
1059 if (n != 0 || i->openmax) {
1060 i->max -= n;
1061 changed = 1;
1062 }
1063 if (snd_interval_checkempty(i)) {
1064 i->empty = 1;
1065 return -EINVAL;
1066 }
1067 return changed;
1068 }
1069
1070 /* Info constraints helpers */
1071
1072 /**
1073 * snd_pcm_hw_rule_add - add the hw-constraint rule
1074 * @runtime: the pcm runtime instance
1075 * @cond: condition bits
1076 * @var: the variable to evaluate
1077 * @func: the evaluation function
1078 * @private: the private data pointer passed to function
1079 * @dep: the dependent variables
1080 *
1081 * Returns zero if successful, or a negative error code on failure.
1082 */
1083 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
1084 int var,
1085 snd_pcm_hw_rule_func_t func, void *private,
1086 int dep, ...)
1087 {
1088 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1089 struct snd_pcm_hw_rule *c;
1090 unsigned int k;
1091 va_list args;
1092 va_start(args, dep);
1093 if (constrs->rules_num >= constrs->rules_all) {
1094 struct snd_pcm_hw_rule *new;
1095 unsigned int new_rules = constrs->rules_all + 16;
1096 new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
1097 if (!new) {
1098 va_end(args);
1099 return -ENOMEM;
1100 }
1101 if (constrs->rules) {
1102 memcpy(new, constrs->rules,
1103 constrs->rules_num * sizeof(*c));
1104 kfree(constrs->rules);
1105 }
1106 constrs->rules = new;
1107 constrs->rules_all = new_rules;
1108 }
1109 c = &constrs->rules[constrs->rules_num];
1110 c->cond = cond;
1111 c->func = func;
1112 c->var = var;
1113 c->private = private;
1114 k = 0;
1115 while (1) {
1116 if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps))) {
1117 va_end(args);
1118 return -EINVAL;
1119 }
1120 c->deps[k++] = dep;
1121 if (dep < 0)
1122 break;
1123 dep = va_arg(args, int);
1124 }
1125 constrs->rules_num++;
1126 va_end(args);
1127 return 0;
1128 }
1129
1130 EXPORT_SYMBOL(snd_pcm_hw_rule_add);
1131
1132 /**
1133 * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
1134 * @runtime: PCM runtime instance
1135 * @var: hw_params variable to apply the mask
1136 * @mask: the bitmap mask
1137 *
1138 * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
1139 */
1140 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1141 u_int32_t mask)
1142 {
1143 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1144 struct snd_mask *maskp = constrs_mask(constrs, var);
1145 *maskp->bits &= mask;
1146 memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
1147 if (*maskp->bits == 0)
1148 return -EINVAL;
1149 return 0;
1150 }
1151
1152 /**
1153 * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
1154 * @runtime: PCM runtime instance
1155 * @var: hw_params variable to apply the mask
1156 * @mask: the 64bit bitmap mask
1157 *
1158 * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
1159 */
1160 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1161 u_int64_t mask)
1162 {
1163 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1164 struct snd_mask *maskp = constrs_mask(constrs, var);
1165 maskp->bits[0] &= (u_int32_t)mask;
1166 maskp->bits[1] &= (u_int32_t)(mask >> 32);
1167 memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
1168 if (! maskp->bits[0] && ! maskp->bits[1])
1169 return -EINVAL;
1170 return 0;
1171 }
1172
1173 /**
1174 * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
1175 * @runtime: PCM runtime instance
1176 * @var: hw_params variable to apply the integer constraint
1177 *
1178 * Apply the constraint of integer to an interval parameter.
1179 */
1180 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
1181 {
1182 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1183 return snd_interval_setinteger(constrs_interval(constrs, var));
1184 }
1185
1186 EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
1187
1188 /**
1189 * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
1190 * @runtime: PCM runtime instance
1191 * @var: hw_params variable to apply the range
1192 * @min: the minimal value
1193 * @max: the maximal value
1194 *
1195 * Apply the min/max range constraint to an interval parameter.
1196 */
1197 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1198 unsigned int min, unsigned int max)
1199 {
1200 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1201 struct snd_interval t;
1202 t.min = min;
1203 t.max = max;
1204 t.openmin = t.openmax = 0;
1205 t.integer = 0;
1206 return snd_interval_refine(constrs_interval(constrs, var), &t);
1207 }
1208
1209 EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
1210
1211 static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
1212 struct snd_pcm_hw_rule *rule)
1213 {
1214 struct snd_pcm_hw_constraint_list *list = rule->private;
1215 return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
1216 }
1217
1218
1219 /**
1220 * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
1221 * @runtime: PCM runtime instance
1222 * @cond: condition bits
1223 * @var: hw_params variable to apply the list constraint
1224 * @l: list
1225 *
1226 * Apply the list of constraints to an interval parameter.
1227 */
1228 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1229 unsigned int cond,
1230 snd_pcm_hw_param_t var,
1231 struct snd_pcm_hw_constraint_list *l)
1232 {
1233 return snd_pcm_hw_rule_add(runtime, cond, var,
1234 snd_pcm_hw_rule_list, l,
1235 var, -1);
1236 }
1237
1238 EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
1239
1240 static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
1241 struct snd_pcm_hw_rule *rule)
1242 {
1243 struct snd_pcm_hw_constraint_ratnums *r = rule->private;
1244 unsigned int num = 0, den = 0;
1245 int err;
1246 err = snd_interval_ratnum(hw_param_interval(params, rule->var),
1247 r->nrats, r->rats, &num, &den);
1248 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1249 params->rate_num = num;
1250 params->rate_den = den;
1251 }
1252 return err;
1253 }
1254
1255 /**
1256 * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
1257 * @runtime: PCM runtime instance
1258 * @cond: condition bits
1259 * @var: hw_params variable to apply the ratnums constraint
1260 * @r: struct snd_ratnums constriants
1261 */
1262 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1263 unsigned int cond,
1264 snd_pcm_hw_param_t var,
1265 struct snd_pcm_hw_constraint_ratnums *r)
1266 {
1267 return snd_pcm_hw_rule_add(runtime, cond, var,
1268 snd_pcm_hw_rule_ratnums, r,
1269 var, -1);
1270 }
1271
1272 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
1273
1274 static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
1275 struct snd_pcm_hw_rule *rule)
1276 {
1277 struct snd_pcm_hw_constraint_ratdens *r = rule->private;
1278 unsigned int num = 0, den = 0;
1279 int err = snd_interval_ratden(hw_param_interval(params, rule->var),
1280 r->nrats, r->rats, &num, &den);
1281 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1282 params->rate_num = num;
1283 params->rate_den = den;
1284 }
1285 return err;
1286 }
1287
1288 /**
1289 * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
1290 * @runtime: PCM runtime instance
1291 * @cond: condition bits
1292 * @var: hw_params variable to apply the ratdens constraint
1293 * @r: struct snd_ratdens constriants
1294 */
1295 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1296 unsigned int cond,
1297 snd_pcm_hw_param_t var,
1298 struct snd_pcm_hw_constraint_ratdens *r)
1299 {
1300 return snd_pcm_hw_rule_add(runtime, cond, var,
1301 snd_pcm_hw_rule_ratdens, r,
1302 var, -1);
1303 }
1304
1305 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
1306
1307 static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
1308 struct snd_pcm_hw_rule *rule)
1309 {
1310 unsigned int l = (unsigned long) rule->private;
1311 int width = l & 0xffff;
1312 unsigned int msbits = l >> 16;
1313 struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
1314 if (snd_interval_single(i) && snd_interval_value(i) == width)
1315 params->msbits = msbits;
1316 return 0;
1317 }
1318
1319 /**
1320 * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
1321 * @runtime: PCM runtime instance
1322 * @cond: condition bits
1323 * @width: sample bits width
1324 * @msbits: msbits width
1325 */
1326 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1327 unsigned int cond,
1328 unsigned int width,
1329 unsigned int msbits)
1330 {
1331 unsigned long l = (msbits << 16) | width;
1332 return snd_pcm_hw_rule_add(runtime, cond, -1,
1333 snd_pcm_hw_rule_msbits,
1334 (void*) l,
1335 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1336 }
1337
1338 EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
1339
1340 static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
1341 struct snd_pcm_hw_rule *rule)
1342 {
1343 unsigned long step = (unsigned long) rule->private;
1344 return snd_interval_step(hw_param_interval(params, rule->var), 0, step);
1345 }
1346
1347 /**
1348 * snd_pcm_hw_constraint_step - add a hw constraint step rule
1349 * @runtime: PCM runtime instance
1350 * @cond: condition bits
1351 * @var: hw_params variable to apply the step constraint
1352 * @step: step size
1353 */
1354 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1355 unsigned int cond,
1356 snd_pcm_hw_param_t var,
1357 unsigned long step)
1358 {
1359 return snd_pcm_hw_rule_add(runtime, cond, var,
1360 snd_pcm_hw_rule_step, (void *) step,
1361 var, -1);
1362 }
1363
1364 EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
1365
1366 static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
1367 {
1368 static unsigned int pow2_sizes[] = {
1369 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1370 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1371 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1372 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1373 };
1374 return snd_interval_list(hw_param_interval(params, rule->var),
1375 ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
1376 }
1377
1378 /**
1379 * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
1380 * @runtime: PCM runtime instance
1381 * @cond: condition bits
1382 * @var: hw_params variable to apply the power-of-2 constraint
1383 */
1384 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1385 unsigned int cond,
1386 snd_pcm_hw_param_t var)
1387 {
1388 return snd_pcm_hw_rule_add(runtime, cond, var,
1389 snd_pcm_hw_rule_pow2, NULL,
1390 var, -1);
1391 }
1392
1393 EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
1394
1395 static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
1396 snd_pcm_hw_param_t var)
1397 {
1398 if (hw_is_mask(var)) {
1399 snd_mask_any(hw_param_mask(params, var));
1400 params->cmask |= 1 << var;
1401 params->rmask |= 1 << var;
1402 return;
1403 }
1404 if (hw_is_interval(var)) {
1405 snd_interval_any(hw_param_interval(params, var));
1406 params->cmask |= 1 << var;
1407 params->rmask |= 1 << var;
1408 return;
1409 }
1410 snd_BUG();
1411 }
1412
1413 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
1414 {
1415 unsigned int k;
1416 memset(params, 0, sizeof(*params));
1417 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1418 _snd_pcm_hw_param_any(params, k);
1419 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1420 _snd_pcm_hw_param_any(params, k);
1421 params->info = ~0U;
1422 }
1423
1424 EXPORT_SYMBOL(_snd_pcm_hw_params_any);
1425
1426 /**
1427 * snd_pcm_hw_param_value - return @params field @var value
1428 * @params: the hw_params instance
1429 * @var: parameter to retrieve
1430 * @dir: pointer to the direction (-1,0,1) or %NULL
1431 *
1432 * Return the value for field @var if it's fixed in configuration space
1433 * defined by @params. Return -%EINVAL otherwise.
1434 */
1435 int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
1436 snd_pcm_hw_param_t var, int *dir)
1437 {
1438 if (hw_is_mask(var)) {
1439 const struct snd_mask *mask = hw_param_mask_c(params, var);
1440 if (!snd_mask_single(mask))
1441 return -EINVAL;
1442 if (dir)
1443 *dir = 0;
1444 return snd_mask_value(mask);
1445 }
1446 if (hw_is_interval(var)) {
1447 const struct snd_interval *i = hw_param_interval_c(params, var);
1448 if (!snd_interval_single(i))
1449 return -EINVAL;
1450 if (dir)
1451 *dir = i->openmin;
1452 return snd_interval_value(i);
1453 }
1454 return -EINVAL;
1455 }
1456
1457 EXPORT_SYMBOL(snd_pcm_hw_param_value);
1458
1459 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
1460 snd_pcm_hw_param_t var)
1461 {
1462 if (hw_is_mask(var)) {
1463 snd_mask_none(hw_param_mask(params, var));
1464 params->cmask |= 1 << var;
1465 params->rmask |= 1 << var;
1466 } else if (hw_is_interval(var)) {
1467 snd_interval_none(hw_param_interval(params, var));
1468 params->cmask |= 1 << var;
1469 params->rmask |= 1 << var;
1470 } else {
1471 snd_BUG();
1472 }
1473 }
1474
1475 EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
1476
1477 static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
1478 snd_pcm_hw_param_t var)
1479 {
1480 int changed;
1481 if (hw_is_mask(var))
1482 changed = snd_mask_refine_first(hw_param_mask(params, var));
1483 else if (hw_is_interval(var))
1484 changed = snd_interval_refine_first(hw_param_interval(params, var));
1485 else
1486 return -EINVAL;
1487 if (changed) {
1488 params->cmask |= 1 << var;
1489 params->rmask |= 1 << var;
1490 }
1491 return changed;
1492 }
1493
1494
1495 /**
1496 * snd_pcm_hw_param_first - refine config space and return minimum value
1497 * @pcm: PCM instance
1498 * @params: the hw_params instance
1499 * @var: parameter to retrieve
1500 * @dir: pointer to the direction (-1,0,1) or %NULL
1501 *
1502 * Inside configuration space defined by @params remove from @var all
1503 * values > minimum. Reduce configuration space accordingly.
1504 * Return the minimum.
1505 */
1506 int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
1507 struct snd_pcm_hw_params *params,
1508 snd_pcm_hw_param_t var, int *dir)
1509 {
1510 int changed = _snd_pcm_hw_param_first(params, var);
1511 if (changed < 0)
1512 return changed;
1513 if (params->rmask) {
1514 int err = snd_pcm_hw_refine(pcm, params);
1515 if (snd_BUG_ON(err < 0))
1516 return err;
1517 }
1518 return snd_pcm_hw_param_value(params, var, dir);
1519 }
1520
1521 EXPORT_SYMBOL(snd_pcm_hw_param_first);
1522
1523 static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
1524 snd_pcm_hw_param_t var)
1525 {
1526 int changed;
1527 if (hw_is_mask(var))
1528 changed = snd_mask_refine_last(hw_param_mask(params, var));
1529 else if (hw_is_interval(var))
1530 changed = snd_interval_refine_last(hw_param_interval(params, var));
1531 else
1532 return -EINVAL;
1533 if (changed) {
1534 params->cmask |= 1 << var;
1535 params->rmask |= 1 << var;
1536 }
1537 return changed;
1538 }
1539
1540
1541 /**
1542 * snd_pcm_hw_param_last - refine config space and return maximum value
1543 * @pcm: PCM instance
1544 * @params: the hw_params instance
1545 * @var: parameter to retrieve
1546 * @dir: pointer to the direction (-1,0,1) or %NULL
1547 *
1548 * Inside configuration space defined by @params remove from @var all
1549 * values < maximum. Reduce configuration space accordingly.
1550 * Return the maximum.
1551 */
1552 int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
1553 struct snd_pcm_hw_params *params,
1554 snd_pcm_hw_param_t var, int *dir)
1555 {
1556 int changed = _snd_pcm_hw_param_last(params, var);
1557 if (changed < 0)
1558 return changed;
1559 if (params->rmask) {
1560 int err = snd_pcm_hw_refine(pcm, params);
1561 if (snd_BUG_ON(err < 0))
1562 return err;
1563 }
1564 return snd_pcm_hw_param_value(params, var, dir);
1565 }
1566
1567 EXPORT_SYMBOL(snd_pcm_hw_param_last);
1568
1569 /**
1570 * snd_pcm_hw_param_choose - choose a configuration defined by @params
1571 * @pcm: PCM instance
1572 * @params: the hw_params instance
1573 *
1574 * Choose one configuration from configuration space defined by @params.
1575 * The configuration chosen is that obtained fixing in this order:
1576 * first access, first format, first subformat, min channels,
1577 * min rate, min period time, max buffer size, min tick time
1578 */
1579 int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
1580 struct snd_pcm_hw_params *params)
1581 {
1582 static int vars[] = {
1583 SNDRV_PCM_HW_PARAM_ACCESS,
1584 SNDRV_PCM_HW_PARAM_FORMAT,
1585 SNDRV_PCM_HW_PARAM_SUBFORMAT,
1586 SNDRV_PCM_HW_PARAM_CHANNELS,
1587 SNDRV_PCM_HW_PARAM_RATE,
1588 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1589 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1590 SNDRV_PCM_HW_PARAM_TICK_TIME,
1591 -1
1592 };
1593 int err, *v;
1594
1595 for (v = vars; *v != -1; v++) {
1596 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
1597 err = snd_pcm_hw_param_first(pcm, params, *v, NULL);
1598 else
1599 err = snd_pcm_hw_param_last(pcm, params, *v, NULL);
1600 if (snd_BUG_ON(err < 0))
1601 return err;
1602 }
1603 return 0;
1604 }
1605
1606 static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
1607 void *arg)
1608 {
1609 struct snd_pcm_runtime *runtime = substream->runtime;
1610 unsigned long flags;
1611 snd_pcm_stream_lock_irqsave(substream, flags);
1612 if (snd_pcm_running(substream) &&
1613 snd_pcm_update_hw_ptr(substream) >= 0)
1614 runtime->status->hw_ptr %= runtime->buffer_size;
1615 else
1616 runtime->status->hw_ptr = 0;
1617 snd_pcm_stream_unlock_irqrestore(substream, flags);
1618 return 0;
1619 }
1620
1621 static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
1622 void *arg)
1623 {
1624 struct snd_pcm_channel_info *info = arg;
1625 struct snd_pcm_runtime *runtime = substream->runtime;
1626 int width;
1627 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1628 info->offset = -1;
1629 return 0;
1630 }
1631 width = snd_pcm_format_physical_width(runtime->format);
1632 if (width < 0)
1633 return width;
1634 info->offset = 0;
1635 switch (runtime->access) {
1636 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1637 case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1638 info->first = info->channel * width;
1639 info->step = runtime->channels * width;
1640 break;
1641 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1642 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1643 {
1644 size_t size = runtime->dma_bytes / runtime->channels;
1645 info->first = info->channel * size * 8;
1646 info->step = width;
1647 break;
1648 }
1649 default:
1650 snd_BUG();
1651 break;
1652 }
1653 return 0;
1654 }
1655
1656 static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
1657 void *arg)
1658 {
1659 struct snd_pcm_hw_params *params = arg;
1660 snd_pcm_format_t format;
1661 int channels, width;
1662
1663 params->fifo_size = substream->runtime->hw.fifo_size;
1664 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) {
1665 format = params_format(params);
1666 channels = params_channels(params);
1667 width = snd_pcm_format_physical_width(format);
1668 params->fifo_size /= width * channels;
1669 }
1670 return 0;
1671 }
1672
1673 /**
1674 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1675 * @substream: the pcm substream instance
1676 * @cmd: ioctl command
1677 * @arg: ioctl argument
1678 *
1679 * Processes the generic ioctl commands for PCM.
1680 * Can be passed as the ioctl callback for PCM ops.
1681 *
1682 * Returns zero if successful, or a negative error code on failure.
1683 */
1684 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1685 unsigned int cmd, void *arg)
1686 {
1687 switch (cmd) {
1688 case SNDRV_PCM_IOCTL1_INFO:
1689 return 0;
1690 case SNDRV_PCM_IOCTL1_RESET:
1691 return snd_pcm_lib_ioctl_reset(substream, arg);
1692 case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1693 return snd_pcm_lib_ioctl_channel_info(substream, arg);
1694 case SNDRV_PCM_IOCTL1_FIFO_SIZE:
1695 return snd_pcm_lib_ioctl_fifo_size(substream, arg);
1696 }
1697 return -ENXIO;
1698 }
1699
1700 EXPORT_SYMBOL(snd_pcm_lib_ioctl);
1701
1702 /**
1703 * snd_pcm_period_elapsed - update the pcm status for the next period
1704 * @substream: the pcm substream instance
1705 *
1706 * This function is called from the interrupt handler when the
1707 * PCM has processed the period size. It will update the current
1708 * pointer, wake up sleepers, etc.
1709 *
1710 * Even if more than one periods have elapsed since the last call, you
1711 * have to call this only once.
1712 */
1713 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
1714 {
1715 struct snd_pcm_runtime *runtime;
1716 unsigned long flags;
1717
1718 if (PCM_RUNTIME_CHECK(substream))
1719 return;
1720 runtime = substream->runtime;
1721
1722 if (runtime->transfer_ack_begin)
1723 runtime->transfer_ack_begin(substream);
1724
1725 snd_pcm_stream_lock_irqsave(substream, flags);
1726 if (!snd_pcm_running(substream) ||
1727 snd_pcm_update_hw_ptr0(substream, 1) < 0)
1728 goto _end;
1729
1730 if (substream->timer_running)
1731 snd_timer_interrupt(substream->timer, 1);
1732 _end:
1733 snd_pcm_stream_unlock_irqrestore(substream, flags);
1734 if (runtime->transfer_ack_end)
1735 runtime->transfer_ack_end(substream);
1736 kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
1737 }
1738
1739 EXPORT_SYMBOL(snd_pcm_period_elapsed);
1740
1741 /*
1742 * Wait until avail_min data becomes available
1743 * Returns a negative error code if any error occurs during operation.
1744 * The available space is stored on availp. When err = 0 and avail = 0
1745 * on the capture stream, it indicates the stream is in DRAINING state.
1746 */
1747 static int wait_for_avail(struct snd_pcm_substream *substream,
1748 snd_pcm_uframes_t *availp)
1749 {
1750 struct snd_pcm_runtime *runtime = substream->runtime;
1751 int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
1752 wait_queue_t wait;
1753 int err = 0;
1754 snd_pcm_uframes_t avail = 0;
1755 long tout;
1756
1757 init_waitqueue_entry(&wait, current);
1758 add_wait_queue(&runtime->tsleep, &wait);
1759 for (;;) {
1760 if (signal_pending(current)) {
1761 err = -ERESTARTSYS;
1762 break;
1763 }
1764 set_current_state(TASK_INTERRUPTIBLE);
1765 snd_pcm_stream_unlock_irq(substream);
1766 tout = schedule_timeout(msecs_to_jiffies(10000));
1767 snd_pcm_stream_lock_irq(substream);
1768 switch (runtime->status->state) {
1769 case SNDRV_PCM_STATE_SUSPENDED:
1770 err = -ESTRPIPE;
1771 goto _endloop;
1772 case SNDRV_PCM_STATE_XRUN:
1773 err = -EPIPE;
1774 goto _endloop;
1775 case SNDRV_PCM_STATE_DRAINING:
1776 if (is_playback)
1777 err = -EPIPE;
1778 else
1779 avail = 0; /* indicate draining */
1780 goto _endloop;
1781 case SNDRV_PCM_STATE_OPEN:
1782 case SNDRV_PCM_STATE_SETUP:
1783 case SNDRV_PCM_STATE_DISCONNECTED:
1784 err = -EBADFD;
1785 goto _endloop;
1786 }
1787 if (!tout) {
1788 snd_printd("%s write error (DMA or IRQ trouble?)\n",
1789 is_playback ? "playback" : "capture");
1790 err = -EIO;
1791 break;
1792 }
1793 if (is_playback)
1794 avail = snd_pcm_playback_avail(runtime);
1795 else
1796 avail = snd_pcm_capture_avail(runtime);
1797 if (avail >= runtime->twake)
1798 break;
1799 }
1800 _endloop:
1801 remove_wait_queue(&runtime->tsleep, &wait);
1802 *availp = avail;
1803 return err;
1804 }
1805
1806 static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream,
1807 unsigned int hwoff,
1808 unsigned long data, unsigned int off,
1809 snd_pcm_uframes_t frames)
1810 {
1811 struct snd_pcm_runtime *runtime = substream->runtime;
1812 int err;
1813 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
1814 if (substream->ops->copy) {
1815 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
1816 return err;
1817 } else {
1818 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
1819 if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
1820 return -EFAULT;
1821 }
1822 return 0;
1823 }
1824
1825 typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff,
1826 unsigned long data, unsigned int off,
1827 snd_pcm_uframes_t size);
1828
1829 static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
1830 unsigned long data,
1831 snd_pcm_uframes_t size,
1832 int nonblock,
1833 transfer_f transfer)
1834 {
1835 struct snd_pcm_runtime *runtime = substream->runtime;
1836 snd_pcm_uframes_t xfer = 0;
1837 snd_pcm_uframes_t offset = 0;
1838 int err = 0;
1839
1840 if (size == 0)
1841 return 0;
1842
1843 snd_pcm_stream_lock_irq(substream);
1844 switch (runtime->status->state) {
1845 case SNDRV_PCM_STATE_PREPARED:
1846 case SNDRV_PCM_STATE_RUNNING:
1847 case SNDRV_PCM_STATE_PAUSED:
1848 break;
1849 case SNDRV_PCM_STATE_XRUN:
1850 err = -EPIPE;
1851 goto _end_unlock;
1852 case SNDRV_PCM_STATE_SUSPENDED:
1853 err = -ESTRPIPE;
1854 goto _end_unlock;
1855 default:
1856 err = -EBADFD;
1857 goto _end_unlock;
1858 }
1859
1860 runtime->twake = runtime->control->avail_min ? : 1;
1861 while (size > 0) {
1862 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
1863 snd_pcm_uframes_t avail;
1864 snd_pcm_uframes_t cont;
1865 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
1866 snd_pcm_update_hw_ptr(substream);
1867 avail = snd_pcm_playback_avail(runtime);
1868 if (!avail) {
1869 if (nonblock) {
1870 err = -EAGAIN;
1871 goto _end_unlock;
1872 }
1873 runtime->twake = min_t(snd_pcm_uframes_t, size,
1874 runtime->control->avail_min ? : 1);
1875 err = wait_for_avail(substream, &avail);
1876 if (err < 0)
1877 goto _end_unlock;
1878 }
1879 frames = size > avail ? avail : size;
1880 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
1881 if (frames > cont)
1882 frames = cont;
1883 if (snd_BUG_ON(!frames)) {
1884 runtime->twake = 0;
1885 snd_pcm_stream_unlock_irq(substream);
1886 return -EINVAL;
1887 }
1888 appl_ptr = runtime->control->appl_ptr;
1889 appl_ofs = appl_ptr % runtime->buffer_size;
1890 snd_pcm_stream_unlock_irq(substream);
1891 err = transfer(substream, appl_ofs, data, offset, frames);
1892 snd_pcm_stream_lock_irq(substream);
1893 if (err < 0)
1894 goto _end_unlock;
1895 switch (runtime->status->state) {
1896 case SNDRV_PCM_STATE_XRUN:
1897 err = -EPIPE;
1898 goto _end_unlock;
1899 case SNDRV_PCM_STATE_SUSPENDED:
1900 err = -ESTRPIPE;
1901 goto _end_unlock;
1902 default:
1903 break;
1904 }
1905 appl_ptr += frames;
1906 if (appl_ptr >= runtime->boundary)
1907 appl_ptr -= runtime->boundary;
1908 runtime->control->appl_ptr = appl_ptr;
1909 if (substream->ops->ack)
1910 substream->ops->ack(substream);
1911
1912 offset += frames;
1913 size -= frames;
1914 xfer += frames;
1915 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
1916 snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
1917 err = snd_pcm_start(substream);
1918 if (err < 0)
1919 goto _end_unlock;
1920 }
1921 }
1922 _end_unlock:
1923 runtime->twake = 0;
1924 if (xfer > 0 && err >= 0)
1925 snd_pcm_update_state(substream, runtime);
1926 snd_pcm_stream_unlock_irq(substream);
1927 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
1928 }
1929
1930 /* sanity-check for read/write methods */
1931 static int pcm_sanity_check(struct snd_pcm_substream *substream)
1932 {
1933 struct snd_pcm_runtime *runtime;
1934 if (PCM_RUNTIME_CHECK(substream))
1935 return -ENXIO;
1936 runtime = substream->runtime;
1937 if (snd_BUG_ON(!substream->ops->copy && !runtime->dma_area))
1938 return -EINVAL;
1939 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1940 return -EBADFD;
1941 return 0;
1942 }
1943
1944 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, const void __user *buf, snd_pcm_uframes_t size)
1945 {
1946 struct snd_pcm_runtime *runtime;
1947 int nonblock;
1948 int err;
1949
1950 err = pcm_sanity_check(substream);
1951 if (err < 0)
1952 return err;
1953 runtime = substream->runtime;
1954 nonblock = !!(substream->f_flags & O_NONBLOCK);
1955
1956 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
1957 runtime->channels > 1)
1958 return -EINVAL;
1959 return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock,
1960 snd_pcm_lib_write_transfer);
1961 }
1962
1963 EXPORT_SYMBOL(snd_pcm_lib_write);
1964
1965 static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream,
1966 unsigned int hwoff,
1967 unsigned long data, unsigned int off,
1968 snd_pcm_uframes_t frames)
1969 {
1970 struct snd_pcm_runtime *runtime = substream->runtime;
1971 int err;
1972 void __user **bufs = (void __user **)data;
1973 int channels = runtime->channels;
1974 int c;
1975 if (substream->ops->copy) {
1976 if (snd_BUG_ON(!substream->ops->silence))
1977 return -EINVAL;
1978 for (c = 0; c < channels; ++c, ++bufs) {
1979 if (*bufs == NULL) {
1980 if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0)
1981 return err;
1982 } else {
1983 char __user *buf = *bufs + samples_to_bytes(runtime, off);
1984 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
1985 return err;
1986 }
1987 }
1988 } else {
1989 /* default transfer behaviour */
1990 size_t dma_csize = runtime->dma_bytes / channels;
1991 for (c = 0; c < channels; ++c, ++bufs) {
1992 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
1993 if (*bufs == NULL) {
1994 snd_pcm_format_set_silence(runtime->format, hwbuf, frames);
1995 } else {
1996 char __user *buf = *bufs + samples_to_bytes(runtime, off);
1997 if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames)))
1998 return -EFAULT;
1999 }
2000 }
2001 }
2002 return 0;
2003 }
2004
2005 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
2006 void __user **bufs,
2007 snd_pcm_uframes_t frames)
2008 {
2009 struct snd_pcm_runtime *runtime;
2010 int nonblock;
2011 int err;
2012
2013 err = pcm_sanity_check(substream);
2014 if (err < 0)
2015 return err;
2016 runtime = substream->runtime;
2017 nonblock = !!(substream->f_flags & O_NONBLOCK);
2018
2019 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2020 return -EINVAL;
2021 return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames,
2022 nonblock, snd_pcm_lib_writev_transfer);
2023 }
2024
2025 EXPORT_SYMBOL(snd_pcm_lib_writev);
2026
2027 static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream,
2028 unsigned int hwoff,
2029 unsigned long data, unsigned int off,
2030 snd_pcm_uframes_t frames)
2031 {
2032 struct snd_pcm_runtime *runtime = substream->runtime;
2033 int err;
2034 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
2035 if (substream->ops->copy) {
2036 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
2037 return err;
2038 } else {
2039 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
2040 if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
2041 return -EFAULT;
2042 }
2043 return 0;
2044 }
2045
2046 static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
2047 unsigned long data,
2048 snd_pcm_uframes_t size,
2049 int nonblock,
2050 transfer_f transfer)
2051 {
2052 struct snd_pcm_runtime *runtime = substream->runtime;
2053 snd_pcm_uframes_t xfer = 0;
2054 snd_pcm_uframes_t offset = 0;
2055 int err = 0;
2056
2057 if (size == 0)
2058 return 0;
2059
2060 snd_pcm_stream_lock_irq(substream);
2061 switch (runtime->status->state) {
2062 case SNDRV_PCM_STATE_PREPARED:
2063 if (size >= runtime->start_threshold) {
2064 err = snd_pcm_start(substream);
2065 if (err < 0)
2066 goto _end_unlock;
2067 }
2068 break;
2069 case SNDRV_PCM_STATE_DRAINING:
2070 case SNDRV_PCM_STATE_RUNNING:
2071 case SNDRV_PCM_STATE_PAUSED:
2072 break;
2073 case SNDRV_PCM_STATE_XRUN:
2074 err = -EPIPE;
2075 goto _end_unlock;
2076 case SNDRV_PCM_STATE_SUSPENDED:
2077 err = -ESTRPIPE;
2078 goto _end_unlock;
2079 default:
2080 err = -EBADFD;
2081 goto _end_unlock;
2082 }
2083
2084 runtime->twake = runtime->control->avail_min ? : 1;
2085 while (size > 0) {
2086 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2087 snd_pcm_uframes_t avail;
2088 snd_pcm_uframes_t cont;
2089 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2090 snd_pcm_update_hw_ptr(substream);
2091 avail = snd_pcm_capture_avail(runtime);
2092 if (!avail) {
2093 if (runtime->status->state ==
2094 SNDRV_PCM_STATE_DRAINING) {
2095 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2096 goto _end_unlock;
2097 }
2098 if (nonblock) {
2099 err = -EAGAIN;
2100 goto _end_unlock;
2101 }
2102 runtime->twake = min_t(snd_pcm_uframes_t, size,
2103 runtime->control->avail_min ? : 1);
2104 err = wait_for_avail(substream, &avail);
2105 if (err < 0)
2106 goto _end_unlock;
2107 if (!avail)
2108 continue; /* draining */
2109 }
2110 frames = size > avail ? avail : size;
2111 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2112 if (frames > cont)
2113 frames = cont;
2114 if (snd_BUG_ON(!frames)) {
2115 runtime->twake = 0;
2116 snd_pcm_stream_unlock_irq(substream);
2117 return -EINVAL;
2118 }
2119 appl_ptr = runtime->control->appl_ptr;
2120 appl_ofs = appl_ptr % runtime->buffer_size;
2121 snd_pcm_stream_unlock_irq(substream);
2122 err = transfer(substream, appl_ofs, data, offset, frames);
2123 snd_pcm_stream_lock_irq(substream);
2124 if (err < 0)
2125 goto _end_unlock;
2126 switch (runtime->status->state) {
2127 case SNDRV_PCM_STATE_XRUN:
2128 err = -EPIPE;
2129 goto _end_unlock;
2130 case SNDRV_PCM_STATE_SUSPENDED:
2131 err = -ESTRPIPE;
2132 goto _end_unlock;
2133 default:
2134 break;
2135 }
2136 appl_ptr += frames;
2137 if (appl_ptr >= runtime->boundary)
2138 appl_ptr -= runtime->boundary;
2139 runtime->control->appl_ptr = appl_ptr;
2140 if (substream->ops->ack)
2141 substream->ops->ack(substream);
2142
2143 offset += frames;
2144 size -= frames;
2145 xfer += frames;
2146 }
2147 _end_unlock:
2148 runtime->twake = 0;
2149 if (xfer > 0 && err >= 0)
2150 snd_pcm_update_state(substream, runtime);
2151 snd_pcm_stream_unlock_irq(substream);
2152 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2153 }
2154
2155 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, void __user *buf, snd_pcm_uframes_t size)
2156 {
2157 struct snd_pcm_runtime *runtime;
2158 int nonblock;
2159 int err;
2160
2161 err = pcm_sanity_check(substream);
2162 if (err < 0)
2163 return err;
2164 runtime = substream->runtime;
2165 nonblock = !!(substream->f_flags & O_NONBLOCK);
2166 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED)
2167 return -EINVAL;
2168 return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer);
2169 }
2170
2171 EXPORT_SYMBOL(snd_pcm_lib_read);
2172
2173 static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream,
2174 unsigned int hwoff,
2175 unsigned long data, unsigned int off,
2176 snd_pcm_uframes_t frames)
2177 {
2178 struct snd_pcm_runtime *runtime = substream->runtime;
2179 int err;
2180 void __user **bufs = (void __user **)data;
2181 int channels = runtime->channels;
2182 int c;
2183 if (substream->ops->copy) {
2184 for (c = 0; c < channels; ++c, ++bufs) {
2185 char __user *buf;
2186 if (*bufs == NULL)
2187 continue;
2188 buf = *bufs + samples_to_bytes(runtime, off);
2189 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2190 return err;
2191 }
2192 } else {
2193 snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
2194 for (c = 0; c < channels; ++c, ++bufs) {
2195 char *hwbuf;
2196 char __user *buf;
2197 if (*bufs == NULL)
2198 continue;
2199
2200 hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2201 buf = *bufs + samples_to_bytes(runtime, off);
2202 if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
2203 return -EFAULT;
2204 }
2205 }
2206 return 0;
2207 }
2208
2209 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
2210 void __user **bufs,
2211 snd_pcm_uframes_t frames)
2212 {
2213 struct snd_pcm_runtime *runtime;
2214 int nonblock;
2215 int err;
2216
2217 err = pcm_sanity_check(substream);
2218 if (err < 0)
2219 return err;
2220 runtime = substream->runtime;
2221 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2222 return -EBADFD;
2223
2224 nonblock = !!(substream->f_flags & O_NONBLOCK);
2225 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2226 return -EINVAL;
2227 return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer);
2228 }
2229
2230 EXPORT_SYMBOL(snd_pcm_lib_readv);
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