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console: add /proc/consoles
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / sound / core / pcm_lib.c
bloba1707cca9c6635c8b4cd7e79b5cebe21bffc2d9e
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 /* something must be really wrong */
377 if (delta >= runtime->buffer_size + runtime->period_size) {
378 hw_ptr_error(substream,
379 "Unexpected hw_pointer value %s"
380 "(stream=%i, pos=%ld, new_hw_ptr=%ld, "
381 "old_hw_ptr=%ld)\n",
382 in_interrupt ? "[Q] " : "[P]",
383 substream->stream, (long)pos,
384 (long)new_hw_ptr, (long)old_hw_ptr);
385 return 0;
386 }
387
388 /* Do jiffies check only in xrun_debug mode */
389 if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
390 goto no_jiffies_check;
391
392 /* Skip the jiffies check for hardwares with BATCH flag.
393 * Such hardware usually just increases the position at each IRQ,
394 * thus it can't give any strange position.
395 */
396 if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
397 goto no_jiffies_check;
398 hdelta = delta;
399 if (hdelta < runtime->delay)
400 goto no_jiffies_check;
401 hdelta -= runtime->delay;
402 jdelta = jiffies - runtime->hw_ptr_jiffies;
403 if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
404 delta = jdelta /
405 (((runtime->period_size * HZ) / runtime->rate)
406 + HZ/100);
407 /* move new_hw_ptr according jiffies not pos variable */
408 new_hw_ptr = old_hw_ptr;
409 hw_base = delta;
410 /* use loop to avoid checks for delta overflows */
411 /* the delta value is small or zero in most cases */
412 while (delta > 0) {
413 new_hw_ptr += runtime->period_size;
414 if (new_hw_ptr >= runtime->boundary)
415 new_hw_ptr -= runtime->boundary;
416 delta--;
417 }
418 /* align hw_base to buffer_size */
419 hw_ptr_error(substream,
420 "hw_ptr skipping! %s"
421 "(pos=%ld, delta=%ld, period=%ld, "
422 "jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
423 in_interrupt ? "[Q] " : "",
424 (long)pos, (long)hdelta,
425 (long)runtime->period_size, jdelta,
426 ((hdelta * HZ) / runtime->rate), hw_base,
427 (unsigned long)old_hw_ptr,
428 (unsigned long)new_hw_ptr);
429 /* reset values to proper state */
430 delta = 0;
431 hw_base = new_hw_ptr - (new_hw_ptr % runtime->buffer_size);
432 }
433 no_jiffies_check:
434 if (delta > runtime->period_size + runtime->period_size / 2) {
435 hw_ptr_error(substream,
436 "Lost interrupts? %s"
437 "(stream=%i, delta=%ld, new_hw_ptr=%ld, "
438 "old_hw_ptr=%ld)\n",
439 in_interrupt ? "[Q] " : "",
440 substream->stream, (long)delta,
441 (long)new_hw_ptr,
442 (long)old_hw_ptr);
443 }
444
445 if (runtime->status->hw_ptr == new_hw_ptr)
446 return 0;
447
448 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
449 runtime->silence_size > 0)
450 snd_pcm_playback_silence(substream, new_hw_ptr);
451
452 if (in_interrupt) {
453 delta = new_hw_ptr - runtime->hw_ptr_interrupt;
454 if (delta < 0)
455 delta += runtime->boundary;
456 delta -= (snd_pcm_uframes_t)delta % runtime->period_size;
457 runtime->hw_ptr_interrupt += delta;
458 if (runtime->hw_ptr_interrupt >= runtime->boundary)
459 runtime->hw_ptr_interrupt -= runtime->boundary;
460 }
461 runtime->hw_ptr_base = hw_base;
462 runtime->status->hw_ptr = new_hw_ptr;
463 runtime->hw_ptr_jiffies = jiffies;
464 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
465 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
466
467 return snd_pcm_update_state(substream, runtime);
468 }
469
470 /* CAUTION: call it with irq disabled */
471 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
472 {
473 return snd_pcm_update_hw_ptr0(substream, 0);
474 }
475
476 /**
477 * snd_pcm_set_ops - set the PCM operators
478 * @pcm: the pcm instance
479 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
480 * @ops: the operator table
481 *
482 * Sets the given PCM operators to the pcm instance.
483 */
484 void snd_pcm_set_ops(struct snd_pcm *pcm, int direction, struct snd_pcm_ops *ops)
485 {
486 struct snd_pcm_str *stream = &pcm->streams[direction];
487 struct snd_pcm_substream *substream;
488
489 for (substream = stream->substream; substream != NULL; substream = substream->next)
490 substream->ops = ops;
491 }
492
493 EXPORT_SYMBOL(snd_pcm_set_ops);
494
495 /**
496 * snd_pcm_sync - set the PCM sync id
497 * @substream: the pcm substream
498 *
499 * Sets the PCM sync identifier for the card.
500 */
501 void snd_pcm_set_sync(struct snd_pcm_substream *substream)
502 {
503 struct snd_pcm_runtime *runtime = substream->runtime;
504
505 runtime->sync.id32[0] = substream->pcm->card->number;
506 runtime->sync.id32[1] = -1;
507 runtime->sync.id32[2] = -1;
508 runtime->sync.id32[3] = -1;
509 }
510
511 EXPORT_SYMBOL(snd_pcm_set_sync);
512
513 /*
514 * Standard ioctl routine
515 */
516
517 static inline unsigned int div32(unsigned int a, unsigned int b,
518 unsigned int *r)
519 {
520 if (b == 0) {
521 *r = 0;
522 return UINT_MAX;
523 }
524 *r = a % b;
525 return a / b;
526 }
527
528 static inline unsigned int div_down(unsigned int a, unsigned int b)
529 {
530 if (b == 0)
531 return UINT_MAX;
532 return a / b;
533 }
534
535 static inline unsigned int div_up(unsigned int a, unsigned int b)
536 {
537 unsigned int r;
538 unsigned int q;
539 if (b == 0)
540 return UINT_MAX;
541 q = div32(a, b, &r);
542 if (r)
543 ++q;
544 return q;
545 }
546
547 static inline unsigned int mul(unsigned int a, unsigned int b)
548 {
549 if (a == 0)
550 return 0;
551 if (div_down(UINT_MAX, a) < b)
552 return UINT_MAX;
553 return a * b;
554 }
555
556 static inline unsigned int muldiv32(unsigned int a, unsigned int b,
557 unsigned int c, unsigned int *r)
558 {
559 u_int64_t n = (u_int64_t) a * b;
560 if (c == 0) {
561 snd_BUG_ON(!n);
562 *r = 0;
563 return UINT_MAX;
564 }
565 n = div_u64_rem(n, c, r);
566 if (n >= UINT_MAX) {
567 *r = 0;
568 return UINT_MAX;
569 }
570 return n;
571 }
572
573 /**
574 * snd_interval_refine - refine the interval value of configurator
575 * @i: the interval value to refine
576 * @v: the interval value to refer to
577 *
578 * Refines the interval value with the reference value.
579 * The interval is changed to the range satisfying both intervals.
580 * The interval status (min, max, integer, etc.) are evaluated.
581 *
582 * Returns non-zero if the value is changed, zero if not changed.
583 */
584 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
585 {
586 int changed = 0;
587 if (snd_BUG_ON(snd_interval_empty(i)))
588 return -EINVAL;
589 if (i->min < v->min) {
590 i->min = v->min;
591 i->openmin = v->openmin;
592 changed = 1;
593 } else if (i->min == v->min && !i->openmin && v->openmin) {
594 i->openmin = 1;
595 changed = 1;
596 }
597 if (i->max > v->max) {
598 i->max = v->max;
599 i->openmax = v->openmax;
600 changed = 1;
601 } else if (i->max == v->max && !i->openmax && v->openmax) {
602 i->openmax = 1;
603 changed = 1;
604 }
605 if (!i->integer && v->integer) {
606 i->integer = 1;
607 changed = 1;
608 }
609 if (i->integer) {
610 if (i->openmin) {
611 i->min++;
612 i->openmin = 0;
613 }
614 if (i->openmax) {
615 i->max--;
616 i->openmax = 0;
617 }
618 } else if (!i->openmin && !i->openmax && i->min == i->max)
619 i->integer = 1;
620 if (snd_interval_checkempty(i)) {
621 snd_interval_none(i);
622 return -EINVAL;
623 }
624 return changed;
625 }
626
627 EXPORT_SYMBOL(snd_interval_refine);
628
629 static int snd_interval_refine_first(struct snd_interval *i)
630 {
631 if (snd_BUG_ON(snd_interval_empty(i)))
632 return -EINVAL;
633 if (snd_interval_single(i))
634 return 0;
635 i->max = i->min;
636 i->openmax = i->openmin;
637 if (i->openmax)
638 i->max++;
639 return 1;
640 }
641
642 static int snd_interval_refine_last(struct snd_interval *i)
643 {
644 if (snd_BUG_ON(snd_interval_empty(i)))
645 return -EINVAL;
646 if (snd_interval_single(i))
647 return 0;
648 i->min = i->max;
649 i->openmin = i->openmax;
650 if (i->openmin)
651 i->min--;
652 return 1;
653 }
654
655 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
656 {
657 if (a->empty || b->empty) {
658 snd_interval_none(c);
659 return;
660 }
661 c->empty = 0;
662 c->min = mul(a->min, b->min);
663 c->openmin = (a->openmin || b->openmin);
664 c->max = mul(a->max, b->max);
665 c->openmax = (a->openmax || b->openmax);
666 c->integer = (a->integer && b->integer);
667 }
668
669 /**
670 * snd_interval_div - refine the interval value with division
671 * @a: dividend
672 * @b: divisor
673 * @c: quotient
674 *
675 * c = a / b
676 *
677 * Returns non-zero if the value is changed, zero if not changed.
678 */
679 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
680 {
681 unsigned int r;
682 if (a->empty || b->empty) {
683 snd_interval_none(c);
684 return;
685 }
686 c->empty = 0;
687 c->min = div32(a->min, b->max, &r);
688 c->openmin = (r || a->openmin || b->openmax);
689 if (b->min > 0) {
690 c->max = div32(a->max, b->min, &r);
691 if (r) {
692 c->max++;
693 c->openmax = 1;
694 } else
695 c->openmax = (a->openmax || b->openmin);
696 } else {
697 c->max = UINT_MAX;
698 c->openmax = 0;
699 }
700 c->integer = 0;
701 }
702
703 /**
704 * snd_interval_muldivk - refine the interval value
705 * @a: dividend 1
706 * @b: dividend 2
707 * @k: divisor (as integer)
708 * @c: result
709 *
710 * c = a * b / k
711 *
712 * Returns non-zero if the value is changed, zero if not changed.
713 */
714 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
715 unsigned int k, struct snd_interval *c)
716 {
717 unsigned int r;
718 if (a->empty || b->empty) {
719 snd_interval_none(c);
720 return;
721 }
722 c->empty = 0;
723 c->min = muldiv32(a->min, b->min, k, &r);
724 c->openmin = (r || a->openmin || b->openmin);
725 c->max = muldiv32(a->max, b->max, k, &r);
726 if (r) {
727 c->max++;
728 c->openmax = 1;
729 } else
730 c->openmax = (a->openmax || b->openmax);
731 c->integer = 0;
732 }
733
734 /**
735 * snd_interval_mulkdiv - refine the interval value
736 * @a: dividend 1
737 * @k: dividend 2 (as integer)
738 * @b: divisor
739 * @c: result
740 *
741 * c = a * k / b
742 *
743 * Returns non-zero if the value is changed, zero if not changed.
744 */
745 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
746 const struct snd_interval *b, struct snd_interval *c)
747 {
748 unsigned int r;
749 if (a->empty || b->empty) {
750 snd_interval_none(c);
751 return;
752 }
753 c->empty = 0;
754 c->min = muldiv32(a->min, k, b->max, &r);
755 c->openmin = (r || a->openmin || b->openmax);
756 if (b->min > 0) {
757 c->max = muldiv32(a->max, k, b->min, &r);
758 if (r) {
759 c->max++;
760 c->openmax = 1;
761 } else
762 c->openmax = (a->openmax || b->openmin);
763 } else {
764 c->max = UINT_MAX;
765 c->openmax = 0;
766 }
767 c->integer = 0;
768 }
769
770 /* ---- */
771
772
773 /**
774 * snd_interval_ratnum - refine the interval value
775 * @i: interval to refine
776 * @rats_count: number of ratnum_t
777 * @rats: ratnum_t array
778 * @nump: pointer to store the resultant numerator
779 * @denp: pointer to store the resultant denominator
780 *
781 * Returns non-zero if the value is changed, zero if not changed.
782 */
783 int snd_interval_ratnum(struct snd_interval *i,
784 unsigned int rats_count, struct snd_ratnum *rats,
785 unsigned int *nump, unsigned int *denp)
786 {
787 unsigned int best_num, best_den;
788 int best_diff;
789 unsigned int k;
790 struct snd_interval t;
791 int err;
792 unsigned int result_num, result_den;
793 int result_diff;
794
795 best_num = best_den = best_diff = 0;
796 for (k = 0; k < rats_count; ++k) {
797 unsigned int num = rats[k].num;
798 unsigned int den;
799 unsigned int q = i->min;
800 int diff;
801 if (q == 0)
802 q = 1;
803 den = div_up(num, q);
804 if (den < rats[k].den_min)
805 continue;
806 if (den > rats[k].den_max)
807 den = rats[k].den_max;
808 else {
809 unsigned int r;
810 r = (den - rats[k].den_min) % rats[k].den_step;
811 if (r != 0)
812 den -= r;
813 }
814 diff = num - q * den;
815 if (diff < 0)
816 diff = -diff;
817 if (best_num == 0 ||
818 diff * best_den < best_diff * den) {
819 best_diff = diff;
820 best_den = den;
821 best_num = num;
822 }
823 }
824 if (best_den == 0) {
825 i->empty = 1;
826 return -EINVAL;
827 }
828 t.min = div_down(best_num, best_den);
829 t.openmin = !!(best_num % best_den);
830
831 result_num = best_num;
832 result_diff = best_diff;
833 result_den = best_den;
834 best_num = best_den = best_diff = 0;
835 for (k = 0; k < rats_count; ++k) {
836 unsigned int num = rats[k].num;
837 unsigned int den;
838 unsigned int q = i->max;
839 int diff;
840 if (q == 0) {
841 i->empty = 1;
842 return -EINVAL;
843 }
844 den = div_down(num, q);
845 if (den > rats[k].den_max)
846 continue;
847 if (den < rats[k].den_min)
848 den = rats[k].den_min;
849 else {
850 unsigned int r;
851 r = (den - rats[k].den_min) % rats[k].den_step;
852 if (r != 0)
853 den += rats[k].den_step - r;
854 }
855 diff = q * den - num;
856 if (diff < 0)
857 diff = -diff;
858 if (best_num == 0 ||
859 diff * best_den < best_diff * den) {
860 best_diff = diff;
861 best_den = den;
862 best_num = num;
863 }
864 }
865 if (best_den == 0) {
866 i->empty = 1;
867 return -EINVAL;
868 }
869 t.max = div_up(best_num, best_den);
870 t.openmax = !!(best_num % best_den);
871 t.integer = 0;
872 err = snd_interval_refine(i, &t);
873 if (err < 0)
874 return err;
875
876 if (snd_interval_single(i)) {
877 if (best_diff * result_den < result_diff * best_den) {
878 result_num = best_num;
879 result_den = best_den;
880 }
881 if (nump)
882 *nump = result_num;
883 if (denp)
884 *denp = result_den;
885 }
886 return err;
887 }
888
889 EXPORT_SYMBOL(snd_interval_ratnum);
890
891 /**
892 * snd_interval_ratden - refine the interval value
893 * @i: interval to refine
894 * @rats_count: number of struct ratden
895 * @rats: struct ratden array
896 * @nump: pointer to store the resultant numerator
897 * @denp: pointer to store the resultant denominator
898 *
899 * Returns non-zero if the value is changed, zero if not changed.
900 */
901 static int snd_interval_ratden(struct snd_interval *i,
902 unsigned int rats_count, struct snd_ratden *rats,
903 unsigned int *nump, unsigned int *denp)
904 {
905 unsigned int best_num, best_diff, best_den;
906 unsigned int k;
907 struct snd_interval t;
908 int err;
909
910 best_num = best_den = best_diff = 0;
911 for (k = 0; k < rats_count; ++k) {
912 unsigned int num;
913 unsigned int den = rats[k].den;
914 unsigned int q = i->min;
915 int diff;
916 num = mul(q, den);
917 if (num > rats[k].num_max)
918 continue;
919 if (num < rats[k].num_min)
920 num = rats[k].num_max;
921 else {
922 unsigned int r;
923 r = (num - rats[k].num_min) % rats[k].num_step;
924 if (r != 0)
925 num += rats[k].num_step - r;
926 }
927 diff = num - q * den;
928 if (best_num == 0 ||
929 diff * best_den < best_diff * den) {
930 best_diff = diff;
931 best_den = den;
932 best_num = num;
933 }
934 }
935 if (best_den == 0) {
936 i->empty = 1;
937 return -EINVAL;
938 }
939 t.min = div_down(best_num, best_den);
940 t.openmin = !!(best_num % best_den);
941
942 best_num = best_den = best_diff = 0;
943 for (k = 0; k < rats_count; ++k) {
944 unsigned int num;
945 unsigned int den = rats[k].den;
946 unsigned int q = i->max;
947 int diff;
948 num = mul(q, den);
949 if (num < rats[k].num_min)
950 continue;
951 if (num > rats[k].num_max)
952 num = rats[k].num_max;
953 else {
954 unsigned int r;
955 r = (num - rats[k].num_min) % rats[k].num_step;
956 if (r != 0)
957 num -= r;
958 }
959 diff = q * den - num;
960 if (best_num == 0 ||
961 diff * best_den < best_diff * den) {
962 best_diff = diff;
963 best_den = den;
964 best_num = num;
965 }
966 }
967 if (best_den == 0) {
968 i->empty = 1;
969 return -EINVAL;
970 }
971 t.max = div_up(best_num, best_den);
972 t.openmax = !!(best_num % best_den);
973 t.integer = 0;
974 err = snd_interval_refine(i, &t);
975 if (err < 0)
976 return err;
977
978 if (snd_interval_single(i)) {
979 if (nump)
980 *nump = best_num;
981 if (denp)
982 *denp = best_den;
983 }
984 return err;
985 }
986
987 /**
988 * snd_interval_list - refine the interval value from the list
989 * @i: the interval value to refine
990 * @count: the number of elements in the list
991 * @list: the value list
992 * @mask: the bit-mask to evaluate
993 *
994 * Refines the interval value from the list.
995 * When mask is non-zero, only the elements corresponding to bit 1 are
996 * evaluated.
997 *
998 * Returns non-zero if the value is changed, zero if not changed.
999 */
1000 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask)
1001 {
1002 unsigned int k;
1003 struct snd_interval list_range;
1004
1005 if (!count) {
1006 i->empty = 1;
1007 return -EINVAL;
1008 }
1009 snd_interval_any(&list_range);
1010 list_range.min = UINT_MAX;
1011 list_range.max = 0;
1012 for (k = 0; k < count; k++) {
1013 if (mask && !(mask & (1 << k)))
1014 continue;
1015 if (!snd_interval_test(i, list[k]))
1016 continue;
1017 list_range.min = min(list_range.min, list[k]);
1018 list_range.max = max(list_range.max, list[k]);
1019 }
1020 return snd_interval_refine(i, &list_range);
1021 }
1022
1023 EXPORT_SYMBOL(snd_interval_list);
1024
1025 static int snd_interval_step(struct snd_interval *i, unsigned int min, unsigned int step)
1026 {
1027 unsigned int n;
1028 int changed = 0;
1029 n = (i->min - min) % step;
1030 if (n != 0 || i->openmin) {
1031 i->min += step - n;
1032 changed = 1;
1033 }
1034 n = (i->max - min) % step;
1035 if (n != 0 || i->openmax) {
1036 i->max -= n;
1037 changed = 1;
1038 }
1039 if (snd_interval_checkempty(i)) {
1040 i->empty = 1;
1041 return -EINVAL;
1042 }
1043 return changed;
1044 }
1045
1046 /* Info constraints helpers */
1047
1048 /**
1049 * snd_pcm_hw_rule_add - add the hw-constraint rule
1050 * @runtime: the pcm runtime instance
1051 * @cond: condition bits
1052 * @var: the variable to evaluate
1053 * @func: the evaluation function
1054 * @private: the private data pointer passed to function
1055 * @dep: the dependent variables
1056 *
1057 * Returns zero if successful, or a negative error code on failure.
1058 */
1059 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
1060 int var,
1061 snd_pcm_hw_rule_func_t func, void *private,
1062 int dep, ...)
1063 {
1064 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1065 struct snd_pcm_hw_rule *c;
1066 unsigned int k;
1067 va_list args;
1068 va_start(args, dep);
1069 if (constrs->rules_num >= constrs->rules_all) {
1070 struct snd_pcm_hw_rule *new;
1071 unsigned int new_rules = constrs->rules_all + 16;
1072 new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
1073 if (!new)
1074 return -ENOMEM;
1075 if (constrs->rules) {
1076 memcpy(new, constrs->rules,
1077 constrs->rules_num * sizeof(*c));
1078 kfree(constrs->rules);
1079 }
1080 constrs->rules = new;
1081 constrs->rules_all = new_rules;
1082 }
1083 c = &constrs->rules[constrs->rules_num];
1084 c->cond = cond;
1085 c->func = func;
1086 c->var = var;
1087 c->private = private;
1088 k = 0;
1089 while (1) {
1090 if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps)))
1091 return -EINVAL;
1092 c->deps[k++] = dep;
1093 if (dep < 0)
1094 break;
1095 dep = va_arg(args, int);
1096 }
1097 constrs->rules_num++;
1098 va_end(args);
1099 return 0;
1100 }
1101
1102 EXPORT_SYMBOL(snd_pcm_hw_rule_add);
1103
1104 /**
1105 * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
1106 * @runtime: PCM runtime instance
1107 * @var: hw_params variable to apply the mask
1108 * @mask: the bitmap mask
1109 *
1110 * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
1111 */
1112 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1113 u_int32_t mask)
1114 {
1115 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1116 struct snd_mask *maskp = constrs_mask(constrs, var);
1117 *maskp->bits &= mask;
1118 memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
1119 if (*maskp->bits == 0)
1120 return -EINVAL;
1121 return 0;
1122 }
1123
1124 /**
1125 * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
1126 * @runtime: PCM runtime instance
1127 * @var: hw_params variable to apply the mask
1128 * @mask: the 64bit bitmap mask
1129 *
1130 * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
1131 */
1132 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1133 u_int64_t mask)
1134 {
1135 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1136 struct snd_mask *maskp = constrs_mask(constrs, var);
1137 maskp->bits[0] &= (u_int32_t)mask;
1138 maskp->bits[1] &= (u_int32_t)(mask >> 32);
1139 memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
1140 if (! maskp->bits[0] && ! maskp->bits[1])
1141 return -EINVAL;
1142 return 0;
1143 }
1144
1145 /**
1146 * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
1147 * @runtime: PCM runtime instance
1148 * @var: hw_params variable to apply the integer constraint
1149 *
1150 * Apply the constraint of integer to an interval parameter.
1151 */
1152 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
1153 {
1154 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1155 return snd_interval_setinteger(constrs_interval(constrs, var));
1156 }
1157
1158 EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
1159
1160 /**
1161 * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
1162 * @runtime: PCM runtime instance
1163 * @var: hw_params variable to apply the range
1164 * @min: the minimal value
1165 * @max: the maximal value
1166 *
1167 * Apply the min/max range constraint to an interval parameter.
1168 */
1169 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1170 unsigned int min, unsigned int max)
1171 {
1172 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1173 struct snd_interval t;
1174 t.min = min;
1175 t.max = max;
1176 t.openmin = t.openmax = 0;
1177 t.integer = 0;
1178 return snd_interval_refine(constrs_interval(constrs, var), &t);
1179 }
1180
1181 EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
1182
1183 static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
1184 struct snd_pcm_hw_rule *rule)
1185 {
1186 struct snd_pcm_hw_constraint_list *list = rule->private;
1187 return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
1188 }
1189
1190
1191 /**
1192 * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
1193 * @runtime: PCM runtime instance
1194 * @cond: condition bits
1195 * @var: hw_params variable to apply the list constraint
1196 * @l: list
1197 *
1198 * Apply the list of constraints to an interval parameter.
1199 */
1200 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1201 unsigned int cond,
1202 snd_pcm_hw_param_t var,
1203 struct snd_pcm_hw_constraint_list *l)
1204 {
1205 return snd_pcm_hw_rule_add(runtime, cond, var,
1206 snd_pcm_hw_rule_list, l,
1207 var, -1);
1208 }
1209
1210 EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
1211
1212 static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
1213 struct snd_pcm_hw_rule *rule)
1214 {
1215 struct snd_pcm_hw_constraint_ratnums *r = rule->private;
1216 unsigned int num = 0, den = 0;
1217 int err;
1218 err = snd_interval_ratnum(hw_param_interval(params, rule->var),
1219 r->nrats, r->rats, &num, &den);
1220 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1221 params->rate_num = num;
1222 params->rate_den = den;
1223 }
1224 return err;
1225 }
1226
1227 /**
1228 * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
1229 * @runtime: PCM runtime instance
1230 * @cond: condition bits
1231 * @var: hw_params variable to apply the ratnums constraint
1232 * @r: struct snd_ratnums constriants
1233 */
1234 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1235 unsigned int cond,
1236 snd_pcm_hw_param_t var,
1237 struct snd_pcm_hw_constraint_ratnums *r)
1238 {
1239 return snd_pcm_hw_rule_add(runtime, cond, var,
1240 snd_pcm_hw_rule_ratnums, r,
1241 var, -1);
1242 }
1243
1244 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
1245
1246 static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
1247 struct snd_pcm_hw_rule *rule)
1248 {
1249 struct snd_pcm_hw_constraint_ratdens *r = rule->private;
1250 unsigned int num = 0, den = 0;
1251 int err = snd_interval_ratden(hw_param_interval(params, rule->var),
1252 r->nrats, r->rats, &num, &den);
1253 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1254 params->rate_num = num;
1255 params->rate_den = den;
1256 }
1257 return err;
1258 }
1259
1260 /**
1261 * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
1262 * @runtime: PCM runtime instance
1263 * @cond: condition bits
1264 * @var: hw_params variable to apply the ratdens constraint
1265 * @r: struct snd_ratdens constriants
1266 */
1267 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1268 unsigned int cond,
1269 snd_pcm_hw_param_t var,
1270 struct snd_pcm_hw_constraint_ratdens *r)
1271 {
1272 return snd_pcm_hw_rule_add(runtime, cond, var,
1273 snd_pcm_hw_rule_ratdens, r,
1274 var, -1);
1275 }
1276
1277 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
1278
1279 static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
1280 struct snd_pcm_hw_rule *rule)
1281 {
1282 unsigned int l = (unsigned long) rule->private;
1283 int width = l & 0xffff;
1284 unsigned int msbits = l >> 16;
1285 struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
1286 if (snd_interval_single(i) && snd_interval_value(i) == width)
1287 params->msbits = msbits;
1288 return 0;
1289 }
1290
1291 /**
1292 * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
1293 * @runtime: PCM runtime instance
1294 * @cond: condition bits
1295 * @width: sample bits width
1296 * @msbits: msbits width
1297 */
1298 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1299 unsigned int cond,
1300 unsigned int width,
1301 unsigned int msbits)
1302 {
1303 unsigned long l = (msbits << 16) | width;
1304 return snd_pcm_hw_rule_add(runtime, cond, -1,
1305 snd_pcm_hw_rule_msbits,
1306 (void*) l,
1307 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1308 }
1309
1310 EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
1311
1312 static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
1313 struct snd_pcm_hw_rule *rule)
1314 {
1315 unsigned long step = (unsigned long) rule->private;
1316 return snd_interval_step(hw_param_interval(params, rule->var), 0, step);
1317 }
1318
1319 /**
1320 * snd_pcm_hw_constraint_step - add a hw constraint step rule
1321 * @runtime: PCM runtime instance
1322 * @cond: condition bits
1323 * @var: hw_params variable to apply the step constraint
1324 * @step: step size
1325 */
1326 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1327 unsigned int cond,
1328 snd_pcm_hw_param_t var,
1329 unsigned long step)
1330 {
1331 return snd_pcm_hw_rule_add(runtime, cond, var,
1332 snd_pcm_hw_rule_step, (void *) step,
1333 var, -1);
1334 }
1335
1336 EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
1337
1338 static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
1339 {
1340 static unsigned int pow2_sizes[] = {
1341 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1342 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1343 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1344 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1345 };
1346 return snd_interval_list(hw_param_interval(params, rule->var),
1347 ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
1348 }
1349
1350 /**
1351 * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
1352 * @runtime: PCM runtime instance
1353 * @cond: condition bits
1354 * @var: hw_params variable to apply the power-of-2 constraint
1355 */
1356 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1357 unsigned int cond,
1358 snd_pcm_hw_param_t var)
1359 {
1360 return snd_pcm_hw_rule_add(runtime, cond, var,
1361 snd_pcm_hw_rule_pow2, NULL,
1362 var, -1);
1363 }
1364
1365 EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
1366
1367 static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
1368 snd_pcm_hw_param_t var)
1369 {
1370 if (hw_is_mask(var)) {
1371 snd_mask_any(hw_param_mask(params, var));
1372 params->cmask |= 1 << var;
1373 params->rmask |= 1 << var;
1374 return;
1375 }
1376 if (hw_is_interval(var)) {
1377 snd_interval_any(hw_param_interval(params, var));
1378 params->cmask |= 1 << var;
1379 params->rmask |= 1 << var;
1380 return;
1381 }
1382 snd_BUG();
1383 }
1384
1385 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
1386 {
1387 unsigned int k;
1388 memset(params, 0, sizeof(*params));
1389 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1390 _snd_pcm_hw_param_any(params, k);
1391 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1392 _snd_pcm_hw_param_any(params, k);
1393 params->info = ~0U;
1394 }
1395
1396 EXPORT_SYMBOL(_snd_pcm_hw_params_any);
1397
1398 /**
1399 * snd_pcm_hw_param_value - return @params field @var value
1400 * @params: the hw_params instance
1401 * @var: parameter to retrieve
1402 * @dir: pointer to the direction (-1,0,1) or %NULL
1403 *
1404 * Return the value for field @var if it's fixed in configuration space
1405 * defined by @params. Return -%EINVAL otherwise.
1406 */
1407 int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
1408 snd_pcm_hw_param_t var, int *dir)
1409 {
1410 if (hw_is_mask(var)) {
1411 const struct snd_mask *mask = hw_param_mask_c(params, var);
1412 if (!snd_mask_single(mask))
1413 return -EINVAL;
1414 if (dir)
1415 *dir = 0;
1416 return snd_mask_value(mask);
1417 }
1418 if (hw_is_interval(var)) {
1419 const struct snd_interval *i = hw_param_interval_c(params, var);
1420 if (!snd_interval_single(i))
1421 return -EINVAL;
1422 if (dir)
1423 *dir = i->openmin;
1424 return snd_interval_value(i);
1425 }
1426 return -EINVAL;
1427 }
1428
1429 EXPORT_SYMBOL(snd_pcm_hw_param_value);
1430
1431 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
1432 snd_pcm_hw_param_t var)
1433 {
1434 if (hw_is_mask(var)) {
1435 snd_mask_none(hw_param_mask(params, var));
1436 params->cmask |= 1 << var;
1437 params->rmask |= 1 << var;
1438 } else if (hw_is_interval(var)) {
1439 snd_interval_none(hw_param_interval(params, var));
1440 params->cmask |= 1 << var;
1441 params->rmask |= 1 << var;
1442 } else {
1443 snd_BUG();
1444 }
1445 }
1446
1447 EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
1448
1449 static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
1450 snd_pcm_hw_param_t var)
1451 {
1452 int changed;
1453 if (hw_is_mask(var))
1454 changed = snd_mask_refine_first(hw_param_mask(params, var));
1455 else if (hw_is_interval(var))
1456 changed = snd_interval_refine_first(hw_param_interval(params, var));
1457 else
1458 return -EINVAL;
1459 if (changed) {
1460 params->cmask |= 1 << var;
1461 params->rmask |= 1 << var;
1462 }
1463 return changed;
1464 }
1465
1466
1467 /**
1468 * snd_pcm_hw_param_first - refine config space and return minimum value
1469 * @pcm: PCM instance
1470 * @params: the hw_params instance
1471 * @var: parameter to retrieve
1472 * @dir: pointer to the direction (-1,0,1) or %NULL
1473 *
1474 * Inside configuration space defined by @params remove from @var all
1475 * values > minimum. Reduce configuration space accordingly.
1476 * Return the minimum.
1477 */
1478 int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
1479 struct snd_pcm_hw_params *params,
1480 snd_pcm_hw_param_t var, int *dir)
1481 {
1482 int changed = _snd_pcm_hw_param_first(params, var);
1483 if (changed < 0)
1484 return changed;
1485 if (params->rmask) {
1486 int err = snd_pcm_hw_refine(pcm, params);
1487 if (snd_BUG_ON(err < 0))
1488 return err;
1489 }
1490 return snd_pcm_hw_param_value(params, var, dir);
1491 }
1492
1493 EXPORT_SYMBOL(snd_pcm_hw_param_first);
1494
1495 static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
1496 snd_pcm_hw_param_t var)
1497 {
1498 int changed;
1499 if (hw_is_mask(var))
1500 changed = snd_mask_refine_last(hw_param_mask(params, var));
1501 else if (hw_is_interval(var))
1502 changed = snd_interval_refine_last(hw_param_interval(params, var));
1503 else
1504 return -EINVAL;
1505 if (changed) {
1506 params->cmask |= 1 << var;
1507 params->rmask |= 1 << var;
1508 }
1509 return changed;
1510 }
1511
1512
1513 /**
1514 * snd_pcm_hw_param_last - refine config space and return maximum value
1515 * @pcm: PCM instance
1516 * @params: the hw_params instance
1517 * @var: parameter to retrieve
1518 * @dir: pointer to the direction (-1,0,1) or %NULL
1519 *
1520 * Inside configuration space defined by @params remove from @var all
1521 * values < maximum. Reduce configuration space accordingly.
1522 * Return the maximum.
1523 */
1524 int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
1525 struct snd_pcm_hw_params *params,
1526 snd_pcm_hw_param_t var, int *dir)
1527 {
1528 int changed = _snd_pcm_hw_param_last(params, var);
1529 if (changed < 0)
1530 return changed;
1531 if (params->rmask) {
1532 int err = snd_pcm_hw_refine(pcm, params);
1533 if (snd_BUG_ON(err < 0))
1534 return err;
1535 }
1536 return snd_pcm_hw_param_value(params, var, dir);
1537 }
1538
1539 EXPORT_SYMBOL(snd_pcm_hw_param_last);
1540
1541 /**
1542 * snd_pcm_hw_param_choose - choose a configuration defined by @params
1543 * @pcm: PCM instance
1544 * @params: the hw_params instance
1545 *
1546 * Choose one configuration from configuration space defined by @params.
1547 * The configuration chosen is that obtained fixing in this order:
1548 * first access, first format, first subformat, min channels,
1549 * min rate, min period time, max buffer size, min tick time
1550 */
1551 int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
1552 struct snd_pcm_hw_params *params)
1553 {
1554 static int vars[] = {
1555 SNDRV_PCM_HW_PARAM_ACCESS,
1556 SNDRV_PCM_HW_PARAM_FORMAT,
1557 SNDRV_PCM_HW_PARAM_SUBFORMAT,
1558 SNDRV_PCM_HW_PARAM_CHANNELS,
1559 SNDRV_PCM_HW_PARAM_RATE,
1560 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1561 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1562 SNDRV_PCM_HW_PARAM_TICK_TIME,
1563 -1
1564 };
1565 int err, *v;
1566
1567 for (v = vars; *v != -1; v++) {
1568 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
1569 err = snd_pcm_hw_param_first(pcm, params, *v, NULL);
1570 else
1571 err = snd_pcm_hw_param_last(pcm, params, *v, NULL);
1572 if (snd_BUG_ON(err < 0))
1573 return err;
1574 }
1575 return 0;
1576 }
1577
1578 static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
1579 void *arg)
1580 {
1581 struct snd_pcm_runtime *runtime = substream->runtime;
1582 unsigned long flags;
1583 snd_pcm_stream_lock_irqsave(substream, flags);
1584 if (snd_pcm_running(substream) &&
1585 snd_pcm_update_hw_ptr(substream) >= 0)
1586 runtime->status->hw_ptr %= runtime->buffer_size;
1587 else
1588 runtime->status->hw_ptr = 0;
1589 snd_pcm_stream_unlock_irqrestore(substream, flags);
1590 return 0;
1591 }
1592
1593 static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
1594 void *arg)
1595 {
1596 struct snd_pcm_channel_info *info = arg;
1597 struct snd_pcm_runtime *runtime = substream->runtime;
1598 int width;
1599 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1600 info->offset = -1;
1601 return 0;
1602 }
1603 width = snd_pcm_format_physical_width(runtime->format);
1604 if (width < 0)
1605 return width;
1606 info->offset = 0;
1607 switch (runtime->access) {
1608 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1609 case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1610 info->first = info->channel * width;
1611 info->step = runtime->channels * width;
1612 break;
1613 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1614 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1615 {
1616 size_t size = runtime->dma_bytes / runtime->channels;
1617 info->first = info->channel * size * 8;
1618 info->step = width;
1619 break;
1620 }
1621 default:
1622 snd_BUG();
1623 break;
1624 }
1625 return 0;
1626 }
1627
1628 static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
1629 void *arg)
1630 {
1631 struct snd_pcm_hw_params *params = arg;
1632 snd_pcm_format_t format;
1633 int channels, width;
1634
1635 params->fifo_size = substream->runtime->hw.fifo_size;
1636 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) {
1637 format = params_format(params);
1638 channels = params_channels(params);
1639 width = snd_pcm_format_physical_width(format);
1640 params->fifo_size /= width * channels;
1641 }
1642 return 0;
1643 }
1644
1645 /**
1646 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1647 * @substream: the pcm substream instance
1648 * @cmd: ioctl command
1649 * @arg: ioctl argument
1650 *
1651 * Processes the generic ioctl commands for PCM.
1652 * Can be passed as the ioctl callback for PCM ops.
1653 *
1654 * Returns zero if successful, or a negative error code on failure.
1655 */
1656 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1657 unsigned int cmd, void *arg)
1658 {
1659 switch (cmd) {
1660 case SNDRV_PCM_IOCTL1_INFO:
1661 return 0;
1662 case SNDRV_PCM_IOCTL1_RESET:
1663 return snd_pcm_lib_ioctl_reset(substream, arg);
1664 case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1665 return snd_pcm_lib_ioctl_channel_info(substream, arg);
1666 case SNDRV_PCM_IOCTL1_FIFO_SIZE:
1667 return snd_pcm_lib_ioctl_fifo_size(substream, arg);
1668 }
1669 return -ENXIO;
1670 }
1671
1672 EXPORT_SYMBOL(snd_pcm_lib_ioctl);
1673
1674 /**
1675 * snd_pcm_period_elapsed - update the pcm status for the next period
1676 * @substream: the pcm substream instance
1677 *
1678 * This function is called from the interrupt handler when the
1679 * PCM has processed the period size. It will update the current
1680 * pointer, wake up sleepers, etc.
1681 *
1682 * Even if more than one periods have elapsed since the last call, you
1683 * have to call this only once.
1684 */
1685 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
1686 {
1687 struct snd_pcm_runtime *runtime;
1688 unsigned long flags;
1689
1690 if (PCM_RUNTIME_CHECK(substream))
1691 return;
1692 runtime = substream->runtime;
1693
1694 if (runtime->transfer_ack_begin)
1695 runtime->transfer_ack_begin(substream);
1696
1697 snd_pcm_stream_lock_irqsave(substream, flags);
1698 if (!snd_pcm_running(substream) ||
1699 snd_pcm_update_hw_ptr0(substream, 1) < 0)
1700 goto _end;
1701
1702 if (substream->timer_running)
1703 snd_timer_interrupt(substream->timer, 1);
1704 _end:
1705 snd_pcm_stream_unlock_irqrestore(substream, flags);
1706 if (runtime->transfer_ack_end)
1707 runtime->transfer_ack_end(substream);
1708 kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
1709 }
1710
1711 EXPORT_SYMBOL(snd_pcm_period_elapsed);
1712
1713 /*
1714 * Wait until avail_min data becomes available
1715 * Returns a negative error code if any error occurs during operation.
1716 * The available space is stored on availp. When err = 0 and avail = 0
1717 * on the capture stream, it indicates the stream is in DRAINING state.
1718 */
1719 static int wait_for_avail(struct snd_pcm_substream *substream,
1720 snd_pcm_uframes_t *availp)
1721 {
1722 struct snd_pcm_runtime *runtime = substream->runtime;
1723 int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
1724 wait_queue_t wait;
1725 int err = 0;
1726 snd_pcm_uframes_t avail = 0;
1727 long tout;
1728
1729 init_waitqueue_entry(&wait, current);
1730 add_wait_queue(&runtime->tsleep, &wait);
1731 for (;;) {
1732 if (signal_pending(current)) {
1733 err = -ERESTARTSYS;
1734 break;
1735 }
1736 set_current_state(TASK_INTERRUPTIBLE);
1737 snd_pcm_stream_unlock_irq(substream);
1738 tout = schedule_timeout(msecs_to_jiffies(10000));
1739 snd_pcm_stream_lock_irq(substream);
1740 switch (runtime->status->state) {
1741 case SNDRV_PCM_STATE_SUSPENDED:
1742 err = -ESTRPIPE;
1743 goto _endloop;
1744 case SNDRV_PCM_STATE_XRUN:
1745 err = -EPIPE;
1746 goto _endloop;
1747 case SNDRV_PCM_STATE_DRAINING:
1748 if (is_playback)
1749 err = -EPIPE;
1750 else
1751 avail = 0; /* indicate draining */
1752 goto _endloop;
1753 case SNDRV_PCM_STATE_OPEN:
1754 case SNDRV_PCM_STATE_SETUP:
1755 case SNDRV_PCM_STATE_DISCONNECTED:
1756 err = -EBADFD;
1757 goto _endloop;
1758 }
1759 if (!tout) {
1760 snd_printd("%s write error (DMA or IRQ trouble?)\n",
1761 is_playback ? "playback" : "capture");
1762 err = -EIO;
1763 break;
1764 }
1765 if (is_playback)
1766 avail = snd_pcm_playback_avail(runtime);
1767 else
1768 avail = snd_pcm_capture_avail(runtime);
1769 if (avail >= runtime->twake)
1770 break;
1771 }
1772 _endloop:
1773 remove_wait_queue(&runtime->tsleep, &wait);
1774 *availp = avail;
1775 return err;
1776 }
1777
1778 static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream,
1779 unsigned int hwoff,
1780 unsigned long data, unsigned int off,
1781 snd_pcm_uframes_t frames)
1782 {
1783 struct snd_pcm_runtime *runtime = substream->runtime;
1784 int err;
1785 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
1786 if (substream->ops->copy) {
1787 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
1788 return err;
1789 } else {
1790 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
1791 if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
1792 return -EFAULT;
1793 }
1794 return 0;
1795 }
1796
1797 typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff,
1798 unsigned long data, unsigned int off,
1799 snd_pcm_uframes_t size);
1800
1801 static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
1802 unsigned long data,
1803 snd_pcm_uframes_t size,
1804 int nonblock,
1805 transfer_f transfer)
1806 {
1807 struct snd_pcm_runtime *runtime = substream->runtime;
1808 snd_pcm_uframes_t xfer = 0;
1809 snd_pcm_uframes_t offset = 0;
1810 int err = 0;
1811
1812 if (size == 0)
1813 return 0;
1814
1815 snd_pcm_stream_lock_irq(substream);
1816 switch (runtime->status->state) {
1817 case SNDRV_PCM_STATE_PREPARED:
1818 case SNDRV_PCM_STATE_RUNNING:
1819 case SNDRV_PCM_STATE_PAUSED:
1820 break;
1821 case SNDRV_PCM_STATE_XRUN:
1822 err = -EPIPE;
1823 goto _end_unlock;
1824 case SNDRV_PCM_STATE_SUSPENDED:
1825 err = -ESTRPIPE;
1826 goto _end_unlock;
1827 default:
1828 err = -EBADFD;
1829 goto _end_unlock;
1830 }
1831
1832 runtime->twake = runtime->control->avail_min ? : 1;
1833 while (size > 0) {
1834 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
1835 snd_pcm_uframes_t avail;
1836 snd_pcm_uframes_t cont;
1837 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
1838 snd_pcm_update_hw_ptr(substream);
1839 avail = snd_pcm_playback_avail(runtime);
1840 if (!avail) {
1841 if (nonblock) {
1842 err = -EAGAIN;
1843 goto _end_unlock;
1844 }
1845 runtime->twake = min_t(snd_pcm_uframes_t, size,
1846 runtime->control->avail_min ? : 1);
1847 err = wait_for_avail(substream, &avail);
1848 if (err < 0)
1849 goto _end_unlock;
1850 }
1851 frames = size > avail ? avail : size;
1852 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
1853 if (frames > cont)
1854 frames = cont;
1855 if (snd_BUG_ON(!frames)) {
1856 runtime->twake = 0;
1857 snd_pcm_stream_unlock_irq(substream);
1858 return -EINVAL;
1859 }
1860 appl_ptr = runtime->control->appl_ptr;
1861 appl_ofs = appl_ptr % runtime->buffer_size;
1862 snd_pcm_stream_unlock_irq(substream);
1863 err = transfer(substream, appl_ofs, data, offset, frames);
1864 snd_pcm_stream_lock_irq(substream);
1865 if (err < 0)
1866 goto _end_unlock;
1867 switch (runtime->status->state) {
1868 case SNDRV_PCM_STATE_XRUN:
1869 err = -EPIPE;
1870 goto _end_unlock;
1871 case SNDRV_PCM_STATE_SUSPENDED:
1872 err = -ESTRPIPE;
1873 goto _end_unlock;
1874 default:
1875 break;
1876 }
1877 appl_ptr += frames;
1878 if (appl_ptr >= runtime->boundary)
1879 appl_ptr -= runtime->boundary;
1880 runtime->control->appl_ptr = appl_ptr;
1881 if (substream->ops->ack)
1882 substream->ops->ack(substream);
1883
1884 offset += frames;
1885 size -= frames;
1886 xfer += frames;
1887 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
1888 snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
1889 err = snd_pcm_start(substream);
1890 if (err < 0)
1891 goto _end_unlock;
1892 }
1893 }
1894 _end_unlock:
1895 runtime->twake = 0;
1896 if (xfer > 0 && err >= 0)
1897 snd_pcm_update_state(substream, runtime);
1898 snd_pcm_stream_unlock_irq(substream);
1899 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
1900 }
1901
1902 /* sanity-check for read/write methods */
1903 static int pcm_sanity_check(struct snd_pcm_substream *substream)
1904 {
1905 struct snd_pcm_runtime *runtime;
1906 if (PCM_RUNTIME_CHECK(substream))
1907 return -ENXIO;
1908 runtime = substream->runtime;
1909 if (snd_BUG_ON(!substream->ops->copy && !runtime->dma_area))
1910 return -EINVAL;
1911 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1912 return -EBADFD;
1913 return 0;
1914 }
1915
1916 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, const void __user *buf, snd_pcm_uframes_t size)
1917 {
1918 struct snd_pcm_runtime *runtime;
1919 int nonblock;
1920 int err;
1921
1922 err = pcm_sanity_check(substream);
1923 if (err < 0)
1924 return err;
1925 runtime = substream->runtime;
1926 nonblock = !!(substream->f_flags & O_NONBLOCK);
1927
1928 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
1929 runtime->channels > 1)
1930 return -EINVAL;
1931 return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock,
1932 snd_pcm_lib_write_transfer);
1933 }
1934
1935 EXPORT_SYMBOL(snd_pcm_lib_write);
1936
1937 static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream,
1938 unsigned int hwoff,
1939 unsigned long data, unsigned int off,
1940 snd_pcm_uframes_t frames)
1941 {
1942 struct snd_pcm_runtime *runtime = substream->runtime;
1943 int err;
1944 void __user **bufs = (void __user **)data;
1945 int channels = runtime->channels;
1946 int c;
1947 if (substream->ops->copy) {
1948 if (snd_BUG_ON(!substream->ops->silence))
1949 return -EINVAL;
1950 for (c = 0; c < channels; ++c, ++bufs) {
1951 if (*bufs == NULL) {
1952 if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0)
1953 return err;
1954 } else {
1955 char __user *buf = *bufs + samples_to_bytes(runtime, off);
1956 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
1957 return err;
1958 }
1959 }
1960 } else {
1961 /* default transfer behaviour */
1962 size_t dma_csize = runtime->dma_bytes / channels;
1963 for (c = 0; c < channels; ++c, ++bufs) {
1964 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
1965 if (*bufs == NULL) {
1966 snd_pcm_format_set_silence(runtime->format, hwbuf, frames);
1967 } else {
1968 char __user *buf = *bufs + samples_to_bytes(runtime, off);
1969 if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames)))
1970 return -EFAULT;
1971 }
1972 }
1973 }
1974 return 0;
1975 }
1976
1977 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
1978 void __user **bufs,
1979 snd_pcm_uframes_t frames)
1980 {
1981 struct snd_pcm_runtime *runtime;
1982 int nonblock;
1983 int err;
1984
1985 err = pcm_sanity_check(substream);
1986 if (err < 0)
1987 return err;
1988 runtime = substream->runtime;
1989 nonblock = !!(substream->f_flags & O_NONBLOCK);
1990
1991 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
1992 return -EINVAL;
1993 return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames,
1994 nonblock, snd_pcm_lib_writev_transfer);
1995 }
1996
1997 EXPORT_SYMBOL(snd_pcm_lib_writev);
1998
1999 static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream,
2000 unsigned int hwoff,
2001 unsigned long data, unsigned int off,
2002 snd_pcm_uframes_t frames)
2003 {
2004 struct snd_pcm_runtime *runtime = substream->runtime;
2005 int err;
2006 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
2007 if (substream->ops->copy) {
2008 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
2009 return err;
2010 } else {
2011 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
2012 if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
2013 return -EFAULT;
2014 }
2015 return 0;
2016 }
2017
2018 static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
2019 unsigned long data,
2020 snd_pcm_uframes_t size,
2021 int nonblock,
2022 transfer_f transfer)
2023 {
2024 struct snd_pcm_runtime *runtime = substream->runtime;
2025 snd_pcm_uframes_t xfer = 0;
2026 snd_pcm_uframes_t offset = 0;
2027 int err = 0;
2028
2029 if (size == 0)
2030 return 0;
2031
2032 snd_pcm_stream_lock_irq(substream);
2033 switch (runtime->status->state) {
2034 case SNDRV_PCM_STATE_PREPARED:
2035 if (size >= runtime->start_threshold) {
2036 err = snd_pcm_start(substream);
2037 if (err < 0)
2038 goto _end_unlock;
2039 }
2040 break;
2041 case SNDRV_PCM_STATE_DRAINING:
2042 case SNDRV_PCM_STATE_RUNNING:
2043 case SNDRV_PCM_STATE_PAUSED:
2044 break;
2045 case SNDRV_PCM_STATE_XRUN:
2046 err = -EPIPE;
2047 goto _end_unlock;
2048 case SNDRV_PCM_STATE_SUSPENDED:
2049 err = -ESTRPIPE;
2050 goto _end_unlock;
2051 default:
2052 err = -EBADFD;
2053 goto _end_unlock;
2054 }
2055
2056 runtime->twake = runtime->control->avail_min ? : 1;
2057 while (size > 0) {
2058 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2059 snd_pcm_uframes_t avail;
2060 snd_pcm_uframes_t cont;
2061 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2062 snd_pcm_update_hw_ptr(substream);
2063 avail = snd_pcm_capture_avail(runtime);
2064 if (!avail) {
2065 if (runtime->status->state ==
2066 SNDRV_PCM_STATE_DRAINING) {
2067 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2068 goto _end_unlock;
2069 }
2070 if (nonblock) {
2071 err = -EAGAIN;
2072 goto _end_unlock;
2073 }
2074 runtime->twake = min_t(snd_pcm_uframes_t, size,
2075 runtime->control->avail_min ? : 1);
2076 err = wait_for_avail(substream, &avail);
2077 if (err < 0)
2078 goto _end_unlock;
2079 if (!avail)
2080 continue; /* draining */
2081 }
2082 frames = size > avail ? avail : size;
2083 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2084 if (frames > cont)
2085 frames = cont;
2086 if (snd_BUG_ON(!frames)) {
2087 runtime->twake = 0;
2088 snd_pcm_stream_unlock_irq(substream);
2089 return -EINVAL;
2090 }
2091 appl_ptr = runtime->control->appl_ptr;
2092 appl_ofs = appl_ptr % runtime->buffer_size;
2093 snd_pcm_stream_unlock_irq(substream);
2094 err = transfer(substream, appl_ofs, data, offset, frames);
2095 snd_pcm_stream_lock_irq(substream);
2096 if (err < 0)
2097 goto _end_unlock;
2098 switch (runtime->status->state) {
2099 case SNDRV_PCM_STATE_XRUN:
2100 err = -EPIPE;
2101 goto _end_unlock;
2102 case SNDRV_PCM_STATE_SUSPENDED:
2103 err = -ESTRPIPE;
2104 goto _end_unlock;
2105 default:
2106 break;
2107 }
2108 appl_ptr += frames;
2109 if (appl_ptr >= runtime->boundary)
2110 appl_ptr -= runtime->boundary;
2111 runtime->control->appl_ptr = appl_ptr;
2112 if (substream->ops->ack)
2113 substream->ops->ack(substream);
2114
2115 offset += frames;
2116 size -= frames;
2117 xfer += frames;
2118 }
2119 _end_unlock:
2120 runtime->twake = 0;
2121 if (xfer > 0 && err >= 0)
2122 snd_pcm_update_state(substream, runtime);
2123 snd_pcm_stream_unlock_irq(substream);
2124 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2125 }
2126
2127 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, void __user *buf, snd_pcm_uframes_t size)
2128 {
2129 struct snd_pcm_runtime *runtime;
2130 int nonblock;
2131 int err;
2132
2133 err = pcm_sanity_check(substream);
2134 if (err < 0)
2135 return err;
2136 runtime = substream->runtime;
2137 nonblock = !!(substream->f_flags & O_NONBLOCK);
2138 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED)
2139 return -EINVAL;
2140 return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer);
2141 }
2142
2143 EXPORT_SYMBOL(snd_pcm_lib_read);
2144
2145 static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream,
2146 unsigned int hwoff,
2147 unsigned long data, unsigned int off,
2148 snd_pcm_uframes_t frames)
2149 {
2150 struct snd_pcm_runtime *runtime = substream->runtime;
2151 int err;
2152 void __user **bufs = (void __user **)data;
2153 int channels = runtime->channels;
2154 int c;
2155 if (substream->ops->copy) {
2156 for (c = 0; c < channels; ++c, ++bufs) {
2157 char __user *buf;
2158 if (*bufs == NULL)
2159 continue;
2160 buf = *bufs + samples_to_bytes(runtime, off);
2161 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2162 return err;
2163 }
2164 } else {
2165 snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
2166 for (c = 0; c < channels; ++c, ++bufs) {
2167 char *hwbuf;
2168 char __user *buf;
2169 if (*bufs == NULL)
2170 continue;
2171
2172 hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2173 buf = *bufs + samples_to_bytes(runtime, off);
2174 if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
2175 return -EFAULT;
2176 }
2177 }
2178 return 0;
2179 }
2180
2181 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
2182 void __user **bufs,
2183 snd_pcm_uframes_t frames)
2184 {
2185 struct snd_pcm_runtime *runtime;
2186 int nonblock;
2187 int err;
2188
2189 err = pcm_sanity_check(substream);
2190 if (err < 0)
2191 return err;
2192 runtime = substream->runtime;
2193 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2194 return -EBADFD;
2195
2196 nonblock = !!(substream->f_flags & O_NONBLOCK);
2197 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2198 return -EINVAL;
2199 return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer);
2200 }
2201
2202 EXPORT_SYMBOL(snd_pcm_lib_readv);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree