Root/
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 | runtime->silence_filled = avail > 0 ? avail : 0; |
71 | runtime->silence_start = (runtime->status->hw_ptr + |
72 | runtime->silence_filled) % |
73 | runtime->boundary; |
74 | } else { |
75 | ofs = runtime->status->hw_ptr; |
76 | frames = new_hw_ptr - ofs; |
77 | if ((snd_pcm_sframes_t)frames < 0) |
78 | frames += runtime->boundary; |
79 | runtime->silence_filled -= frames; |
80 | if ((snd_pcm_sframes_t)runtime->silence_filled < 0) { |
81 | runtime->silence_filled = 0; |
82 | runtime->silence_start = new_hw_ptr; |
83 | } else { |
84 | runtime->silence_start = ofs; |
85 | } |
86 | } |
87 | frames = runtime->buffer_size - runtime->silence_filled; |
88 | } |
89 | if (snd_BUG_ON(frames > runtime->buffer_size)) |
90 | return; |
91 | if (frames == 0) |
92 | return; |
93 | ofs = runtime->silence_start % runtime->buffer_size; |
94 | while (frames > 0) { |
95 | transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames; |
96 | if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || |
97 | runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) { |
98 | if (substream->ops->silence) { |
99 | int err; |
100 | err = substream->ops->silence(substream, -1, ofs, transfer); |
101 | snd_BUG_ON(err < 0); |
102 | } else { |
103 | char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs); |
104 | snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels); |
105 | } |
106 | } else { |
107 | unsigned int c; |
108 | unsigned int channels = runtime->channels; |
109 | if (substream->ops->silence) { |
110 | for (c = 0; c < channels; ++c) { |
111 | int err; |
112 | err = substream->ops->silence(substream, c, ofs, transfer); |
113 | snd_BUG_ON(err < 0); |
114 | } |
115 | } else { |
116 | size_t dma_csize = runtime->dma_bytes / channels; |
117 | for (c = 0; c < channels; ++c) { |
118 | char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs); |
119 | snd_pcm_format_set_silence(runtime->format, hwbuf, transfer); |
120 | } |
121 | } |
122 | } |
123 | runtime->silence_filled += transfer; |
124 | frames -= transfer; |
125 | ofs = 0; |
126 | } |
127 | } |
128 | |
129 | static void pcm_debug_name(struct snd_pcm_substream *substream, |
130 | char *name, size_t len) |
131 | { |
132 | snprintf(name, len, "pcmC%dD%d%c:%d", |
133 | substream->pcm->card->number, |
134 | substream->pcm->device, |
135 | substream->stream ? 'c' : 'p', |
136 | substream->number); |
137 | } |
138 | |
139 | #define XRUN_DEBUG_BASIC (1<<0) |
140 | #define XRUN_DEBUG_STACK (1<<1) /* dump also stack */ |
141 | #define XRUN_DEBUG_JIFFIESCHECK (1<<2) /* do jiffies check */ |
142 | #define XRUN_DEBUG_PERIODUPDATE (1<<3) /* full period update info */ |
143 | #define XRUN_DEBUG_HWPTRUPDATE (1<<4) /* full hwptr update info */ |
144 | #define XRUN_DEBUG_LOG (1<<5) /* show last 10 positions on err */ |
145 | #define XRUN_DEBUG_LOGONCE (1<<6) /* do above only once */ |
146 | |
147 | #ifdef CONFIG_SND_PCM_XRUN_DEBUG |
148 | |
149 | #define xrun_debug(substream, mask) \ |
150 | ((substream)->pstr->xrun_debug & (mask)) |
151 | #else |
152 | #define xrun_debug(substream, mask) 0 |
153 | #endif |
154 | |
155 | #define dump_stack_on_xrun(substream) do { \ |
156 | if (xrun_debug(substream, XRUN_DEBUG_STACK)) \ |
157 | dump_stack(); \ |
158 | } while (0) |
159 | |
160 | static void xrun(struct snd_pcm_substream *substream) |
161 | { |
162 | struct snd_pcm_runtime *runtime = substream->runtime; |
163 | |
164 | if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) |
165 | snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp); |
166 | snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); |
167 | if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { |
168 | char name[16]; |
169 | pcm_debug_name(substream, name, sizeof(name)); |
170 | snd_printd(KERN_DEBUG "XRUN: %s\n", name); |
171 | dump_stack_on_xrun(substream); |
172 | } |
173 | } |
174 | |
175 | #ifdef CONFIG_SND_PCM_XRUN_DEBUG |
176 | #define hw_ptr_error(substream, fmt, args...) \ |
177 | do { \ |
178 | if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { \ |
179 | xrun_log_show(substream); \ |
180 | if (printk_ratelimit()) { \ |
181 | snd_printd("PCM: " fmt, ##args); \ |
182 | } \ |
183 | dump_stack_on_xrun(substream); \ |
184 | } \ |
185 | } while (0) |
186 | |
187 | #define XRUN_LOG_CNT 10 |
188 | |
189 | struct hwptr_log_entry { |
190 | unsigned long jiffies; |
191 | snd_pcm_uframes_t pos; |
192 | snd_pcm_uframes_t period_size; |
193 | snd_pcm_uframes_t buffer_size; |
194 | snd_pcm_uframes_t old_hw_ptr; |
195 | snd_pcm_uframes_t hw_ptr_base; |
196 | }; |
197 | |
198 | struct snd_pcm_hwptr_log { |
199 | unsigned int idx; |
200 | unsigned int hit: 1; |
201 | struct hwptr_log_entry entries[XRUN_LOG_CNT]; |
202 | }; |
203 | |
204 | static void xrun_log(struct snd_pcm_substream *substream, |
205 | snd_pcm_uframes_t pos) |
206 | { |
207 | struct snd_pcm_runtime *runtime = substream->runtime; |
208 | struct snd_pcm_hwptr_log *log = runtime->hwptr_log; |
209 | struct hwptr_log_entry *entry; |
210 | |
211 | if (log == NULL) { |
212 | log = kzalloc(sizeof(*log), GFP_ATOMIC); |
213 | if (log == NULL) |
214 | return; |
215 | runtime->hwptr_log = log; |
216 | } else { |
217 | if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit) |
218 | return; |
219 | } |
220 | entry = &log->entries[log->idx]; |
221 | entry->jiffies = jiffies; |
222 | entry->pos = pos; |
223 | entry->period_size = runtime->period_size; |
224 | entry->buffer_size = runtime->buffer_size;; |
225 | entry->old_hw_ptr = runtime->status->hw_ptr; |
226 | entry->hw_ptr_base = runtime->hw_ptr_base; |
227 | log->idx = (log->idx + 1) % XRUN_LOG_CNT; |
228 | } |
229 | |
230 | static void xrun_log_show(struct snd_pcm_substream *substream) |
231 | { |
232 | struct snd_pcm_hwptr_log *log = substream->runtime->hwptr_log; |
233 | struct hwptr_log_entry *entry; |
234 | char name[16]; |
235 | unsigned int idx; |
236 | int cnt; |
237 | |
238 | if (log == NULL) |
239 | return; |
240 | if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit) |
241 | return; |
242 | pcm_debug_name(substream, name, sizeof(name)); |
243 | for (cnt = 0, idx = log->idx; cnt < XRUN_LOG_CNT; cnt++) { |
244 | entry = &log->entries[idx]; |
245 | if (entry->period_size == 0) |
246 | break; |
247 | snd_printd("hwptr log: %s: j=%lu, pos=%ld/%ld/%ld, " |
248 | "hwptr=%ld/%ld\n", |
249 | name, entry->jiffies, (unsigned long)entry->pos, |
250 | (unsigned long)entry->period_size, |
251 | (unsigned long)entry->buffer_size, |
252 | (unsigned long)entry->old_hw_ptr, |
253 | (unsigned long)entry->hw_ptr_base); |
254 | idx++; |
255 | idx %= XRUN_LOG_CNT; |
256 | } |
257 | log->hit = 1; |
258 | } |
259 | |
260 | #else /* ! CONFIG_SND_PCM_XRUN_DEBUG */ |
261 | |
262 | #define hw_ptr_error(substream, fmt, args...) do { } while (0) |
263 | #define xrun_log(substream, pos) do { } while (0) |
264 | #define xrun_log_show(substream) do { } while (0) |
265 | |
266 | #endif |
267 | |
268 | int snd_pcm_update_state(struct snd_pcm_substream *substream, |
269 | struct snd_pcm_runtime *runtime) |
270 | { |
271 | snd_pcm_uframes_t avail; |
272 | |
273 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
274 | avail = snd_pcm_playback_avail(runtime); |
275 | else |
276 | avail = snd_pcm_capture_avail(runtime); |
277 | if (avail > runtime->avail_max) |
278 | runtime->avail_max = avail; |
279 | if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { |
280 | if (avail >= runtime->buffer_size) { |
281 | snd_pcm_drain_done(substream); |
282 | return -EPIPE; |
283 | } |
284 | } else { |
285 | if (avail >= runtime->stop_threshold) { |
286 | xrun(substream); |
287 | return -EPIPE; |
288 | } |
289 | } |
290 | if (avail >= runtime->control->avail_min) |
291 | wake_up(runtime->twake ? &runtime->tsleep : &runtime->sleep); |
292 | return 0; |
293 | } |
294 | |
295 | static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream, |
296 | unsigned int in_interrupt) |
297 | { |
298 | struct snd_pcm_runtime *runtime = substream->runtime; |
299 | snd_pcm_uframes_t pos; |
300 | snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base; |
301 | snd_pcm_sframes_t hdelta, delta; |
302 | unsigned long jdelta; |
303 | |
304 | old_hw_ptr = runtime->status->hw_ptr; |
305 | pos = substream->ops->pointer(substream); |
306 | if (pos == SNDRV_PCM_POS_XRUN) { |
307 | xrun(substream); |
308 | return -EPIPE; |
309 | } |
310 | if (pos >= runtime->buffer_size) { |
311 | if (printk_ratelimit()) { |
312 | char name[16]; |
313 | pcm_debug_name(substream, name, sizeof(name)); |
314 | xrun_log_show(substream); |
315 | snd_printd(KERN_ERR "BUG: %s, pos = %ld, " |
316 | "buffer size = %ld, period size = %ld\n", |
317 | name, pos, runtime->buffer_size, |
318 | runtime->period_size); |
319 | } |
320 | pos = 0; |
321 | } |
322 | pos -= pos % runtime->min_align; |
323 | if (xrun_debug(substream, XRUN_DEBUG_LOG)) |
324 | xrun_log(substream, pos); |
325 | hw_base = runtime->hw_ptr_base; |
326 | new_hw_ptr = hw_base + pos; |
327 | if (in_interrupt) { |
328 | /* we know that one period was processed */ |
329 | /* delta = "expected next hw_ptr" for in_interrupt != 0 */ |
330 | delta = runtime->hw_ptr_interrupt + runtime->period_size; |
331 | if (delta > new_hw_ptr) { |
332 | hw_base += runtime->buffer_size; |
333 | if (hw_base >= runtime->boundary) |
334 | hw_base = 0; |
335 | new_hw_ptr = hw_base + pos; |
336 | goto __delta; |
337 | } |
338 | } |
339 | /* new_hw_ptr might be lower than old_hw_ptr in case when */ |
340 | /* pointer crosses the end of the ring buffer */ |
341 | if (new_hw_ptr < old_hw_ptr) { |
342 | hw_base += runtime->buffer_size; |
343 | if (hw_base >= runtime->boundary) |
344 | hw_base = 0; |
345 | new_hw_ptr = hw_base + pos; |
346 | } |
347 | __delta: |
348 | delta = (new_hw_ptr - old_hw_ptr) % runtime->boundary; |
349 | if (xrun_debug(substream, in_interrupt ? |
350 | XRUN_DEBUG_PERIODUPDATE : XRUN_DEBUG_HWPTRUPDATE)) { |
351 | char name[16]; |
352 | pcm_debug_name(substream, name, sizeof(name)); |
353 | snd_printd("%s_update: %s: pos=%u/%u/%u, " |
354 | "hwptr=%ld/%ld/%ld/%ld\n", |
355 | in_interrupt ? "period" : "hwptr", |
356 | name, |
357 | (unsigned int)pos, |
358 | (unsigned int)runtime->period_size, |
359 | (unsigned int)runtime->buffer_size, |
360 | (unsigned long)delta, |
361 | (unsigned long)old_hw_ptr, |
362 | (unsigned long)new_hw_ptr, |
363 | (unsigned long)runtime->hw_ptr_base); |
364 | } |
365 | /* something must be really wrong */ |
366 | if (delta >= runtime->buffer_size + runtime->period_size) { |
367 | hw_ptr_error(substream, |
368 | "Unexpected hw_pointer value %s" |
369 | "(stream=%i, pos=%ld, new_hw_ptr=%ld, " |
370 | "old_hw_ptr=%ld)\n", |
371 | in_interrupt ? "[Q] " : "[P]", |
372 | substream->stream, (long)pos, |
373 | (long)new_hw_ptr, (long)old_hw_ptr); |
374 | return 0; |
375 | } |
376 | |
377 | /* Do jiffies check only in xrun_debug mode */ |
378 | if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK)) |
379 | goto no_jiffies_check; |
380 | |
381 | /* Skip the jiffies check for hardwares with BATCH flag. |
382 | * Such hardware usually just increases the position at each IRQ, |
383 | * thus it can't give any strange position. |
384 | */ |
385 | if (runtime->hw.info & SNDRV_PCM_INFO_BATCH) |
386 | goto no_jiffies_check; |
387 | hdelta = delta; |
388 | if (hdelta < runtime->delay) |
389 | goto no_jiffies_check; |
390 | hdelta -= runtime->delay; |
391 | jdelta = jiffies - runtime->hw_ptr_jiffies; |
392 | if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) { |
393 | delta = jdelta / |
394 | (((runtime->period_size * HZ) / runtime->rate) |
395 | + HZ/100); |
396 | /* move new_hw_ptr according jiffies not pos variable */ |
397 | new_hw_ptr = old_hw_ptr; |
398 | hw_base = delta; |
399 | /* use loop to avoid checks for delta overflows */ |
400 | /* the delta value is small or zero in most cases */ |
401 | while (delta > 0) { |
402 | new_hw_ptr += runtime->period_size; |
403 | if (new_hw_ptr >= runtime->boundary) |
404 | new_hw_ptr -= runtime->boundary; |
405 | delta--; |
406 | } |
407 | /* align hw_base to buffer_size */ |
408 | hw_ptr_error(substream, |
409 | "hw_ptr skipping! %s" |
410 | "(pos=%ld, delta=%ld, period=%ld, " |
411 | "jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n", |
412 | in_interrupt ? "[Q] " : "", |
413 | (long)pos, (long)hdelta, |
414 | (long)runtime->period_size, jdelta, |
415 | ((hdelta * HZ) / runtime->rate), hw_base, |
416 | (unsigned long)old_hw_ptr, |
417 | (unsigned long)new_hw_ptr); |
418 | /* reset values to proper state */ |
419 | delta = 0; |
420 | hw_base = new_hw_ptr - (new_hw_ptr % runtime->buffer_size); |
421 | } |
422 | no_jiffies_check: |
423 | if (delta > runtime->period_size + runtime->period_size / 2) { |
424 | hw_ptr_error(substream, |
425 | "Lost interrupts? %s" |
426 | "(stream=%i, delta=%ld, new_hw_ptr=%ld, " |
427 | "old_hw_ptr=%ld)\n", |
428 | in_interrupt ? "[Q] " : "", |
429 | substream->stream, (long)delta, |
430 | (long)new_hw_ptr, |
431 | (long)old_hw_ptr); |
432 | } |
433 | |
434 | if (runtime->status->hw_ptr == new_hw_ptr) |
435 | return 0; |
436 | |
437 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && |
438 | runtime->silence_size > 0) |
439 | snd_pcm_playback_silence(substream, new_hw_ptr); |
440 | |
441 | if (in_interrupt) { |
442 | runtime->hw_ptr_interrupt = new_hw_ptr - |
443 | (new_hw_ptr % runtime->period_size); |
444 | } |
445 | runtime->hw_ptr_base = hw_base; |
446 | runtime->status->hw_ptr = new_hw_ptr; |
447 | runtime->hw_ptr_jiffies = jiffies; |
448 | if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) |
449 | snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp); |
450 | |
451 | return snd_pcm_update_state(substream, runtime); |
452 | } |
453 | |
454 | /* CAUTION: call it with irq disabled */ |
455 | int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream) |
456 | { |
457 | return snd_pcm_update_hw_ptr0(substream, 0); |
458 | } |
459 | |
460 | /** |
461 | * snd_pcm_set_ops - set the PCM operators |
462 | * @pcm: the pcm instance |
463 | * @direction: stream direction, SNDRV_PCM_STREAM_XXX |
464 | * @ops: the operator table |
465 | * |
466 | * Sets the given PCM operators to the pcm instance. |
467 | */ |
468 | void snd_pcm_set_ops(struct snd_pcm *pcm, int direction, struct snd_pcm_ops *ops) |
469 | { |
470 | struct snd_pcm_str *stream = &pcm->streams[direction]; |
471 | struct snd_pcm_substream *substream; |
472 | |
473 | for (substream = stream->substream; substream != NULL; substream = substream->next) |
474 | substream->ops = ops; |
475 | } |
476 | |
477 | EXPORT_SYMBOL(snd_pcm_set_ops); |
478 | |
479 | /** |
480 | * snd_pcm_sync - set the PCM sync id |
481 | * @substream: the pcm substream |
482 | * |
483 | * Sets the PCM sync identifier for the card. |
484 | */ |
485 | void snd_pcm_set_sync(struct snd_pcm_substream *substream) |
486 | { |
487 | struct snd_pcm_runtime *runtime = substream->runtime; |
488 | |
489 | runtime->sync.id32[0] = substream->pcm->card->number; |
490 | runtime->sync.id32[1] = -1; |
491 | runtime->sync.id32[2] = -1; |
492 | runtime->sync.id32[3] = -1; |
493 | } |
494 | |
495 | EXPORT_SYMBOL(snd_pcm_set_sync); |
496 | |
497 | /* |
498 | * Standard ioctl routine |
499 | */ |
500 | |
501 | static inline unsigned int div32(unsigned int a, unsigned int b, |
502 | unsigned int *r) |
503 | { |
504 | if (b == 0) { |
505 | *r = 0; |
506 | return UINT_MAX; |
507 | } |
508 | *r = a % b; |
509 | return a / b; |
510 | } |
511 | |
512 | static inline unsigned int div_down(unsigned int a, unsigned int b) |
513 | { |
514 | if (b == 0) |
515 | return UINT_MAX; |
516 | return a / b; |
517 | } |
518 | |
519 | static inline unsigned int div_up(unsigned int a, unsigned int b) |
520 | { |
521 | unsigned int r; |
522 | unsigned int q; |
523 | if (b == 0) |
524 | return UINT_MAX; |
525 | q = div32(a, b, &r); |
526 | if (r) |
527 | ++q; |
528 | return q; |
529 | } |
530 | |
531 | static inline unsigned int mul(unsigned int a, unsigned int b) |
532 | { |
533 | if (a == 0) |
534 | return 0; |
535 | if (div_down(UINT_MAX, a) < b) |
536 | return UINT_MAX; |
537 | return a * b; |
538 | } |
539 | |
540 | static inline unsigned int muldiv32(unsigned int a, unsigned int b, |
541 | unsigned int c, unsigned int *r) |
542 | { |
543 | u_int64_t n = (u_int64_t) a * b; |
544 | if (c == 0) { |
545 | snd_BUG_ON(!n); |
546 | *r = 0; |
547 | return UINT_MAX; |
548 | } |
549 | n = div_u64_rem(n, c, r); |
550 | if (n >= UINT_MAX) { |
551 | *r = 0; |
552 | return UINT_MAX; |
553 | } |
554 | return n; |
555 | } |
556 | |
557 | /** |
558 | * snd_interval_refine - refine the interval value of configurator |
559 | * @i: the interval value to refine |
560 | * @v: the interval value to refer to |
561 | * |
562 | * Refines the interval value with the reference value. |
563 | * The interval is changed to the range satisfying both intervals. |
564 | * The interval status (min, max, integer, etc.) are evaluated. |
565 | * |
566 | * Returns non-zero if the value is changed, zero if not changed. |
567 | */ |
568 | int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v) |
569 | { |
570 | int changed = 0; |
571 | if (snd_BUG_ON(snd_interval_empty(i))) |
572 | return -EINVAL; |
573 | if (i->min < v->min) { |
574 | i->min = v->min; |
575 | i->openmin = v->openmin; |
576 | changed = 1; |
577 | } else if (i->min == v->min && !i->openmin && v->openmin) { |
578 | i->openmin = 1; |
579 | changed = 1; |
580 | } |
581 | if (i->max > v->max) { |
582 | i->max = v->max; |
583 | i->openmax = v->openmax; |
584 | changed = 1; |
585 | } else if (i->max == v->max && !i->openmax && v->openmax) { |
586 | i->openmax = 1; |
587 | changed = 1; |
588 | } |
589 | if (!i->integer && v->integer) { |
590 | i->integer = 1; |
591 | changed = 1; |
592 | } |
593 | if (i->integer) { |
594 | if (i->openmin) { |
595 | i->min++; |
596 | i->openmin = 0; |
597 | } |
598 | if (i->openmax) { |
599 | i->max--; |
600 | i->openmax = 0; |
601 | } |
602 | } else if (!i->openmin && !i->openmax && i->min == i->max) |
603 | i->integer = 1; |
604 | if (snd_interval_checkempty(i)) { |
605 | snd_interval_none(i); |
606 | return -EINVAL; |
607 | } |
608 | return changed; |
609 | } |
610 | |
611 | EXPORT_SYMBOL(snd_interval_refine); |
612 | |
613 | static int snd_interval_refine_first(struct snd_interval *i) |
614 | { |
615 | if (snd_BUG_ON(snd_interval_empty(i))) |
616 | return -EINVAL; |
617 | if (snd_interval_single(i)) |
618 | return 0; |
619 | i->max = i->min; |
620 | i->openmax = i->openmin; |
621 | if (i->openmax) |
622 | i->max++; |
623 | return 1; |
624 | } |
625 | |
626 | static int snd_interval_refine_last(struct snd_interval *i) |
627 | { |
628 | if (snd_BUG_ON(snd_interval_empty(i))) |
629 | return -EINVAL; |
630 | if (snd_interval_single(i)) |
631 | return 0; |
632 | i->min = i->max; |
633 | i->openmin = i->openmax; |
634 | if (i->openmin) |
635 | i->min--; |
636 | return 1; |
637 | } |
638 | |
639 | void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c) |
640 | { |
641 | if (a->empty || b->empty) { |
642 | snd_interval_none(c); |
643 | return; |
644 | } |
645 | c->empty = 0; |
646 | c->min = mul(a->min, b->min); |
647 | c->openmin = (a->openmin || b->openmin); |
648 | c->max = mul(a->max, b->max); |
649 | c->openmax = (a->openmax || b->openmax); |
650 | c->integer = (a->integer && b->integer); |
651 | } |
652 | |
653 | /** |
654 | * snd_interval_div - refine the interval value with division |
655 | * @a: dividend |
656 | * @b: divisor |
657 | * @c: quotient |
658 | * |
659 | * c = a / b |
660 | * |
661 | * Returns non-zero if the value is changed, zero if not changed. |
662 | */ |
663 | void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c) |
664 | { |
665 | unsigned int r; |
666 | if (a->empty || b->empty) { |
667 | snd_interval_none(c); |
668 | return; |
669 | } |
670 | c->empty = 0; |
671 | c->min = div32(a->min, b->max, &r); |
672 | c->openmin = (r || a->openmin || b->openmax); |
673 | if (b->min > 0) { |
674 | c->max = div32(a->max, b->min, &r); |
675 | if (r) { |
676 | c->max++; |
677 | c->openmax = 1; |
678 | } else |
679 | c->openmax = (a->openmax || b->openmin); |
680 | } else { |
681 | c->max = UINT_MAX; |
682 | c->openmax = 0; |
683 | } |
684 | c->integer = 0; |
685 | } |
686 | |
687 | /** |
688 | * snd_interval_muldivk - refine the interval value |
689 | * @a: dividend 1 |
690 | * @b: dividend 2 |
691 | * @k: divisor (as integer) |
692 | * @c: result |
693 | * |
694 | * c = a * b / k |
695 | * |
696 | * Returns non-zero if the value is changed, zero if not changed. |
697 | */ |
698 | void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b, |
699 | unsigned int k, struct snd_interval *c) |
700 | { |
701 | unsigned int r; |
702 | if (a->empty || b->empty) { |
703 | snd_interval_none(c); |
704 | return; |
705 | } |
706 | c->empty = 0; |
707 | c->min = muldiv32(a->min, b->min, k, &r); |
708 | c->openmin = (r || a->openmin || b->openmin); |
709 | c->max = muldiv32(a->max, b->max, k, &r); |
710 | if (r) { |
711 | c->max++; |
712 | c->openmax = 1; |
713 | } else |
714 | c->openmax = (a->openmax || b->openmax); |
715 | c->integer = 0; |
716 | } |
717 | |
718 | /** |
719 | * snd_interval_mulkdiv - refine the interval value |
720 | * @a: dividend 1 |
721 | * @k: dividend 2 (as integer) |
722 | * @b: divisor |
723 | * @c: result |
724 | * |
725 | * c = a * k / b |
726 | * |
727 | * Returns non-zero if the value is changed, zero if not changed. |
728 | */ |
729 | void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k, |
730 | const struct snd_interval *b, struct snd_interval *c) |
731 | { |
732 | unsigned int r; |
733 | if (a->empty || b->empty) { |
734 | snd_interval_none(c); |
735 | return; |
736 | } |
737 | c->empty = 0; |
738 | c->min = muldiv32(a->min, k, b->max, &r); |
739 | c->openmin = (r || a->openmin || b->openmax); |
740 | if (b->min > 0) { |
741 | c->max = muldiv32(a->max, k, b->min, &r); |
742 | if (r) { |
743 | c->max++; |
744 | c->openmax = 1; |
745 | } else |
746 | c->openmax = (a->openmax || b->openmin); |
747 | } else { |
748 | c->max = UINT_MAX; |
749 | c->openmax = 0; |
750 | } |
751 | c->integer = 0; |
752 | } |
753 | |
754 | /* ---- */ |
755 | |
756 | |
757 | /** |
758 | * snd_interval_ratnum - refine the interval value |
759 | * @i: interval to refine |
760 | * @rats_count: number of ratnum_t |
761 | * @rats: ratnum_t array |
762 | * @nump: pointer to store the resultant numerator |
763 | * @denp: pointer to store the resultant denominator |
764 | * |
765 | * Returns non-zero if the value is changed, zero if not changed. |
766 | */ |
767 | int snd_interval_ratnum(struct snd_interval *i, |
768 | unsigned int rats_count, struct snd_ratnum *rats, |
769 | unsigned int *nump, unsigned int *denp) |
770 | { |
771 | unsigned int best_num, best_den; |
772 | int best_diff; |
773 | unsigned int k; |
774 | struct snd_interval t; |
775 | int err; |
776 | unsigned int result_num, result_den; |
777 | int result_diff; |
778 | |
779 | best_num = best_den = best_diff = 0; |
780 | for (k = 0; k < rats_count; ++k) { |
781 | unsigned int num = rats[k].num; |
782 | unsigned int den; |
783 | unsigned int q = i->min; |
784 | int diff; |
785 | if (q == 0) |
786 | q = 1; |
787 | den = div_up(num, q); |
788 | if (den < rats[k].den_min) |
789 | continue; |
790 | if (den > rats[k].den_max) |
791 | den = rats[k].den_max; |
792 | else { |
793 | unsigned int r; |
794 | r = (den - rats[k].den_min) % rats[k].den_step; |
795 | if (r != 0) |
796 | den -= r; |
797 | } |
798 | diff = num - q * den; |
799 | if (diff < 0) |
800 | diff = -diff; |
801 | if (best_num == 0 || |
802 | diff * best_den < best_diff * den) { |
803 | best_diff = diff; |
804 | best_den = den; |
805 | best_num = num; |
806 | } |
807 | } |
808 | if (best_den == 0) { |
809 | i->empty = 1; |
810 | return -EINVAL; |
811 | } |
812 | t.min = div_down(best_num, best_den); |
813 | t.openmin = !!(best_num % best_den); |
814 | |
815 | result_num = best_num; |
816 | result_diff = best_diff; |
817 | result_den = best_den; |
818 | best_num = best_den = best_diff = 0; |
819 | for (k = 0; k < rats_count; ++k) { |
820 | unsigned int num = rats[k].num; |
821 | unsigned int den; |
822 | unsigned int q = i->max; |
823 | int diff; |
824 | if (q == 0) { |
825 | i->empty = 1; |
826 | return -EINVAL; |
827 | } |
828 | den = div_down(num, q); |
829 | if (den > rats[k].den_max) |
830 | continue; |
831 | if (den < rats[k].den_min) |
832 | den = rats[k].den_min; |
833 | else { |
834 | unsigned int r; |
835 | r = (den - rats[k].den_min) % rats[k].den_step; |
836 | if (r != 0) |
837 | den += rats[k].den_step - r; |
838 | } |
839 | diff = q * den - num; |
840 | if (diff < 0) |
841 | diff = -diff; |
842 | if (best_num == 0 || |
843 | diff * best_den < best_diff * den) { |
844 | best_diff = diff; |
845 | best_den = den; |
846 | best_num = num; |
847 | } |
848 | } |
849 | if (best_den == 0) { |
850 | i->empty = 1; |
851 | return -EINVAL; |
852 | } |
853 | t.max = div_up(best_num, best_den); |
854 | t.openmax = !!(best_num % best_den); |
855 | t.integer = 0; |
856 | err = snd_interval_refine(i, &t); |
857 | if (err < 0) |
858 | return err; |
859 | |
860 | if (snd_interval_single(i)) { |
861 | if (best_diff * result_den < result_diff * best_den) { |
862 | result_num = best_num; |
863 | result_den = best_den; |
864 | } |
865 | if (nump) |
866 | *nump = result_num; |
867 | if (denp) |
868 | *denp = result_den; |
869 | } |
870 | return err; |
871 | } |
872 | |
873 | EXPORT_SYMBOL(snd_interval_ratnum); |
874 | |
875 | /** |
876 | * snd_interval_ratden - refine the interval value |
877 | * @i: interval to refine |
878 | * @rats_count: number of struct ratden |
879 | * @rats: struct ratden array |
880 | * @nump: pointer to store the resultant numerator |
881 | * @denp: pointer to store the resultant denominator |
882 | * |
883 | * Returns non-zero if the value is changed, zero if not changed. |
884 | */ |
885 | static int snd_interval_ratden(struct snd_interval *i, |
886 | unsigned int rats_count, struct snd_ratden *rats, |
887 | unsigned int *nump, unsigned int *denp) |
888 | { |
889 | unsigned int best_num, best_diff, best_den; |
890 | unsigned int k; |
891 | struct snd_interval t; |
892 | int err; |
893 | |
894 | best_num = best_den = best_diff = 0; |
895 | for (k = 0; k < rats_count; ++k) { |
896 | unsigned int num; |
897 | unsigned int den = rats[k].den; |
898 | unsigned int q = i->min; |
899 | int diff; |
900 | num = mul(q, den); |
901 | if (num > rats[k].num_max) |
902 | continue; |
903 | if (num < rats[k].num_min) |
904 | num = rats[k].num_max; |
905 | else { |
906 | unsigned int r; |
907 | r = (num - rats[k].num_min) % rats[k].num_step; |
908 | if (r != 0) |
909 | num += rats[k].num_step - r; |
910 | } |
911 | diff = num - q * den; |
912 | if (best_num == 0 || |
913 | diff * best_den < best_diff * den) { |
914 | best_diff = diff; |
915 | best_den = den; |
916 | best_num = num; |
917 | } |
918 | } |
919 | if (best_den == 0) { |
920 | i->empty = 1; |
921 | return -EINVAL; |
922 | } |
923 | t.min = div_down(best_num, best_den); |
924 | t.openmin = !!(best_num % best_den); |
925 | |
926 | best_num = best_den = best_diff = 0; |
927 | for (k = 0; k < rats_count; ++k) { |
928 | unsigned int num; |
929 | unsigned int den = rats[k].den; |
930 | unsigned int q = i->max; |
931 | int diff; |
932 | num = mul(q, den); |
933 | if (num < rats[k].num_min) |
934 | continue; |
935 | if (num > rats[k].num_max) |
936 | num = rats[k].num_max; |
937 | else { |
938 | unsigned int r; |
939 | r = (num - rats[k].num_min) % rats[k].num_step; |
940 | if (r != 0) |
941 | num -= r; |
942 | } |
943 | diff = q * den - num; |
944 | if (best_num == 0 || |
945 | diff * best_den < best_diff * den) { |
946 | best_diff = diff; |
947 | best_den = den; |
948 | best_num = num; |
949 | } |
950 | } |
951 | if (best_den == 0) { |
952 | i->empty = 1; |
953 | return -EINVAL; |
954 | } |
955 | t.max = div_up(best_num, best_den); |
956 | t.openmax = !!(best_num % best_den); |
957 | t.integer = 0; |
958 | err = snd_interval_refine(i, &t); |
959 | if (err < 0) |
960 | return err; |
961 | |
962 | if (snd_interval_single(i)) { |
963 | if (nump) |
964 | *nump = best_num; |
965 | if (denp) |
966 | *denp = best_den; |
967 | } |
968 | return err; |
969 | } |
970 | |
971 | /** |
972 | * snd_interval_list - refine the interval value from the list |
973 | * @i: the interval value to refine |
974 | * @count: the number of elements in the list |
975 | * @list: the value list |
976 | * @mask: the bit-mask to evaluate |
977 | * |
978 | * Refines the interval value from the list. |
979 | * When mask is non-zero, only the elements corresponding to bit 1 are |
980 | * evaluated. |
981 | * |
982 | * Returns non-zero if the value is changed, zero if not changed. |
983 | */ |
984 | int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask) |
985 | { |
986 | unsigned int k; |
987 | struct snd_interval list_range; |
988 | |
989 | if (!count) { |
990 | i->empty = 1; |
991 | return -EINVAL; |
992 | } |
993 | snd_interval_any(&list_range); |
994 | list_range.min = UINT_MAX; |
995 | list_range.max = 0; |
996 | for (k = 0; k < count; k++) { |
997 | if (mask && !(mask & (1 << k))) |
998 | continue; |
999 | if (!snd_interval_test(i, list[k])) |
1000 | continue; |
1001 | list_range.min = min(list_range.min, list[k]); |
1002 | list_range.max = max(list_range.max, list[k]); |
1003 | } |
1004 | return snd_interval_refine(i, &list_range); |
1005 | } |
1006 | |
1007 | EXPORT_SYMBOL(snd_interval_list); |
1008 | |
1009 | static int snd_interval_step(struct snd_interval *i, unsigned int min, unsigned int step) |
1010 | { |
1011 | unsigned int n; |
1012 | int changed = 0; |
1013 | n = (i->min - min) % step; |
1014 | if (n != 0 || i->openmin) { |
1015 | i->min += step - n; |
1016 | changed = 1; |
1017 | } |
1018 | n = (i->max - min) % step; |
1019 | if (n != 0 || i->openmax) { |
1020 | i->max -= n; |
1021 | changed = 1; |
1022 | } |
1023 | if (snd_interval_checkempty(i)) { |
1024 | i->empty = 1; |
1025 | return -EINVAL; |
1026 | } |
1027 | return changed; |
1028 | } |
1029 | |
1030 | /* Info constraints helpers */ |
1031 | |
1032 | /** |
1033 | * snd_pcm_hw_rule_add - add the hw-constraint rule |
1034 | * @runtime: the pcm runtime instance |
1035 | * @cond: condition bits |
1036 | * @var: the variable to evaluate |
1037 | * @func: the evaluation function |
1038 | * @private: the private data pointer passed to function |
1039 | * @dep: the dependent variables |
1040 | * |
1041 | * Returns zero if successful, or a negative error code on failure. |
1042 | */ |
1043 | int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond, |
1044 | int var, |
1045 | snd_pcm_hw_rule_func_t func, void *private, |
1046 | int dep, ...) |
1047 | { |
1048 | struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; |
1049 | struct snd_pcm_hw_rule *c; |
1050 | unsigned int k; |
1051 | va_list args; |
1052 | va_start(args, dep); |
1053 | if (constrs->rules_num >= constrs->rules_all) { |
1054 | struct snd_pcm_hw_rule *new; |
1055 | unsigned int new_rules = constrs->rules_all + 16; |
1056 | new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL); |
1057 | if (!new) |
1058 | return -ENOMEM; |
1059 | if (constrs->rules) { |
1060 | memcpy(new, constrs->rules, |
1061 | constrs->rules_num * sizeof(*c)); |
1062 | kfree(constrs->rules); |
1063 | } |
1064 | constrs->rules = new; |
1065 | constrs->rules_all = new_rules; |
1066 | } |
1067 | c = &constrs->rules[constrs->rules_num]; |
1068 | c->cond = cond; |
1069 | c->func = func; |
1070 | c->var = var; |
1071 | c->private = private; |
1072 | k = 0; |
1073 | while (1) { |
1074 | if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps))) |
1075 | return -EINVAL; |
1076 | c->deps[k++] = dep; |
1077 | if (dep < 0) |
1078 | break; |
1079 | dep = va_arg(args, int); |
1080 | } |
1081 | constrs->rules_num++; |
1082 | va_end(args); |
1083 | return 0; |
1084 | } |
1085 | |
1086 | EXPORT_SYMBOL(snd_pcm_hw_rule_add); |
1087 | |
1088 | /** |
1089 | * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint |
1090 | * @runtime: PCM runtime instance |
1091 | * @var: hw_params variable to apply the mask |
1092 | * @mask: the bitmap mask |
1093 | * |
1094 | * Apply the constraint of the given bitmap mask to a 32-bit mask parameter. |
1095 | */ |
1096 | int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, |
1097 | u_int32_t mask) |
1098 | { |
1099 | struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; |
1100 | struct snd_mask *maskp = constrs_mask(constrs, var); |
1101 | *maskp->bits &= mask; |
1102 | memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */ |
1103 | if (*maskp->bits == 0) |
1104 | return -EINVAL; |
1105 | return 0; |
1106 | } |
1107 | |
1108 | /** |
1109 | * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint |
1110 | * @runtime: PCM runtime instance |
1111 | * @var: hw_params variable to apply the mask |
1112 | * @mask: the 64bit bitmap mask |
1113 | * |
1114 | * Apply the constraint of the given bitmap mask to a 64-bit mask parameter. |
1115 | */ |
1116 | int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, |
1117 | u_int64_t mask) |
1118 | { |
1119 | struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; |
1120 | struct snd_mask *maskp = constrs_mask(constrs, var); |
1121 | maskp->bits[0] &= (u_int32_t)mask; |
1122 | maskp->bits[1] &= (u_int32_t)(mask >> 32); |
1123 | memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */ |
1124 | if (! maskp->bits[0] && ! maskp->bits[1]) |
1125 | return -EINVAL; |
1126 | return 0; |
1127 | } |
1128 | |
1129 | /** |
1130 | * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval |
1131 | * @runtime: PCM runtime instance |
1132 | * @var: hw_params variable to apply the integer constraint |
1133 | * |
1134 | * Apply the constraint of integer to an interval parameter. |
1135 | */ |
1136 | int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var) |
1137 | { |
1138 | struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; |
1139 | return snd_interval_setinteger(constrs_interval(constrs, var)); |
1140 | } |
1141 | |
1142 | EXPORT_SYMBOL(snd_pcm_hw_constraint_integer); |
1143 | |
1144 | /** |
1145 | * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval |
1146 | * @runtime: PCM runtime instance |
1147 | * @var: hw_params variable to apply the range |
1148 | * @min: the minimal value |
1149 | * @max: the maximal value |
1150 | * |
1151 | * Apply the min/max range constraint to an interval parameter. |
1152 | */ |
1153 | int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, |
1154 | unsigned int min, unsigned int max) |
1155 | { |
1156 | struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; |
1157 | struct snd_interval t; |
1158 | t.min = min; |
1159 | t.max = max; |
1160 | t.openmin = t.openmax = 0; |
1161 | t.integer = 0; |
1162 | return snd_interval_refine(constrs_interval(constrs, var), &t); |
1163 | } |
1164 | |
1165 | EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax); |
1166 | |
1167 | static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params, |
1168 | struct snd_pcm_hw_rule *rule) |
1169 | { |
1170 | struct snd_pcm_hw_constraint_list *list = rule->private; |
1171 | return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask); |
1172 | } |
1173 | |
1174 | |
1175 | /** |
1176 | * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter |
1177 | * @runtime: PCM runtime instance |
1178 | * @cond: condition bits |
1179 | * @var: hw_params variable to apply the list constraint |
1180 | * @l: list |
1181 | * |
1182 | * Apply the list of constraints to an interval parameter. |
1183 | */ |
1184 | int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime, |
1185 | unsigned int cond, |
1186 | snd_pcm_hw_param_t var, |
1187 | struct snd_pcm_hw_constraint_list *l) |
1188 | { |
1189 | return snd_pcm_hw_rule_add(runtime, cond, var, |
1190 | snd_pcm_hw_rule_list, l, |
1191 | var, -1); |
1192 | } |
1193 | |
1194 | EXPORT_SYMBOL(snd_pcm_hw_constraint_list); |
1195 | |
1196 | static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params, |
1197 | struct snd_pcm_hw_rule *rule) |
1198 | { |
1199 | struct snd_pcm_hw_constraint_ratnums *r = rule->private; |
1200 | unsigned int num = 0, den = 0; |
1201 | int err; |
1202 | err = snd_interval_ratnum(hw_param_interval(params, rule->var), |
1203 | r->nrats, r->rats, &num, &den); |
1204 | if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) { |
1205 | params->rate_num = num; |
1206 | params->rate_den = den; |
1207 | } |
1208 | return err; |
1209 | } |
1210 | |
1211 | /** |
1212 | * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter |
1213 | * @runtime: PCM runtime instance |
1214 | * @cond: condition bits |
1215 | * @var: hw_params variable to apply the ratnums constraint |
1216 | * @r: struct snd_ratnums constriants |
1217 | */ |
1218 | int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime, |
1219 | unsigned int cond, |
1220 | snd_pcm_hw_param_t var, |
1221 | struct snd_pcm_hw_constraint_ratnums *r) |
1222 | { |
1223 | return snd_pcm_hw_rule_add(runtime, cond, var, |
1224 | snd_pcm_hw_rule_ratnums, r, |
1225 | var, -1); |
1226 | } |
1227 | |
1228 | EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums); |
1229 | |
1230 | static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params, |
1231 | struct snd_pcm_hw_rule *rule) |
1232 | { |
1233 | struct snd_pcm_hw_constraint_ratdens *r = rule->private; |
1234 | unsigned int num = 0, den = 0; |
1235 | int err = snd_interval_ratden(hw_param_interval(params, rule->var), |
1236 | r->nrats, r->rats, &num, &den); |
1237 | if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) { |
1238 | params->rate_num = num; |
1239 | params->rate_den = den; |
1240 | } |
1241 | return err; |
1242 | } |
1243 | |
1244 | /** |
1245 | * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter |
1246 | * @runtime: PCM runtime instance |
1247 | * @cond: condition bits |
1248 | * @var: hw_params variable to apply the ratdens constraint |
1249 | * @r: struct snd_ratdens constriants |
1250 | */ |
1251 | int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime, |
1252 | unsigned int cond, |
1253 | snd_pcm_hw_param_t var, |
1254 | struct snd_pcm_hw_constraint_ratdens *r) |
1255 | { |
1256 | return snd_pcm_hw_rule_add(runtime, cond, var, |
1257 | snd_pcm_hw_rule_ratdens, r, |
1258 | var, -1); |
1259 | } |
1260 | |
1261 | EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens); |
1262 | |
1263 | static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params, |
1264 | struct snd_pcm_hw_rule *rule) |
1265 | { |
1266 | unsigned int l = (unsigned long) rule->private; |
1267 | int width = l & 0xffff; |
1268 | unsigned int msbits = l >> 16; |
1269 | struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); |
1270 | if (snd_interval_single(i) && snd_interval_value(i) == width) |
1271 | params->msbits = msbits; |
1272 | return 0; |
1273 | } |
1274 | |
1275 | /** |
1276 | * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule |
1277 | * @runtime: PCM runtime instance |
1278 | * @cond: condition bits |
1279 | * @width: sample bits width |
1280 | * @msbits: msbits width |
1281 | */ |
1282 | int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime, |
1283 | unsigned int cond, |
1284 | unsigned int width, |
1285 | unsigned int msbits) |
1286 | { |
1287 | unsigned long l = (msbits << 16) | width; |
1288 | return snd_pcm_hw_rule_add(runtime, cond, -1, |
1289 | snd_pcm_hw_rule_msbits, |
1290 | (void*) l, |
1291 | SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); |
1292 | } |
1293 | |
1294 | EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits); |
1295 | |
1296 | static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params, |
1297 | struct snd_pcm_hw_rule *rule) |
1298 | { |
1299 | unsigned long step = (unsigned long) rule->private; |
1300 | return snd_interval_step(hw_param_interval(params, rule->var), 0, step); |
1301 | } |
1302 | |
1303 | /** |
1304 | * snd_pcm_hw_constraint_step - add a hw constraint step rule |
1305 | * @runtime: PCM runtime instance |
1306 | * @cond: condition bits |
1307 | * @var: hw_params variable to apply the step constraint |
1308 | * @step: step size |
1309 | */ |
1310 | int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime, |
1311 | unsigned int cond, |
1312 | snd_pcm_hw_param_t var, |
1313 | unsigned long step) |
1314 | { |
1315 | return snd_pcm_hw_rule_add(runtime, cond, var, |
1316 | snd_pcm_hw_rule_step, (void *) step, |
1317 | var, -1); |
1318 | } |
1319 | |
1320 | EXPORT_SYMBOL(snd_pcm_hw_constraint_step); |
1321 | |
1322 | static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule) |
1323 | { |
1324 | static unsigned int pow2_sizes[] = { |
1325 | 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7, |
1326 | 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15, |
1327 | 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23, |
1328 | 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30 |
1329 | }; |
1330 | return snd_interval_list(hw_param_interval(params, rule->var), |
1331 | ARRAY_SIZE(pow2_sizes), pow2_sizes, 0); |
1332 | } |
1333 | |
1334 | /** |
1335 | * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule |
1336 | * @runtime: PCM runtime instance |
1337 | * @cond: condition bits |
1338 | * @var: hw_params variable to apply the power-of-2 constraint |
1339 | */ |
1340 | int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime, |
1341 | unsigned int cond, |
1342 | snd_pcm_hw_param_t var) |
1343 | { |
1344 | return snd_pcm_hw_rule_add(runtime, cond, var, |
1345 | snd_pcm_hw_rule_pow2, NULL, |
1346 | var, -1); |
1347 | } |
1348 | |
1349 | EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2); |
1350 | |
1351 | static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params, |
1352 | snd_pcm_hw_param_t var) |
1353 | { |
1354 | if (hw_is_mask(var)) { |
1355 | snd_mask_any(hw_param_mask(params, var)); |
1356 | params->cmask |= 1 << var; |
1357 | params->rmask |= 1 << var; |
1358 | return; |
1359 | } |
1360 | if (hw_is_interval(var)) { |
1361 | snd_interval_any(hw_param_interval(params, var)); |
1362 | params->cmask |= 1 << var; |
1363 | params->rmask |= 1 << var; |
1364 | return; |
1365 | } |
1366 | snd_BUG(); |
1367 | } |
1368 | |
1369 | void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params) |
1370 | { |
1371 | unsigned int k; |
1372 | memset(params, 0, sizeof(*params)); |
1373 | for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) |
1374 | _snd_pcm_hw_param_any(params, k); |
1375 | for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) |
1376 | _snd_pcm_hw_param_any(params, k); |
1377 | params->info = ~0U; |
1378 | } |
1379 | |
1380 | EXPORT_SYMBOL(_snd_pcm_hw_params_any); |
1381 | |
1382 | /** |
1383 | * snd_pcm_hw_param_value - return @params field @var value |
1384 | * @params: the hw_params instance |
1385 | * @var: parameter to retrieve |
1386 | * @dir: pointer to the direction (-1,0,1) or %NULL |
1387 | * |
1388 | * Return the value for field @var if it's fixed in configuration space |
1389 | * defined by @params. Return -%EINVAL otherwise. |
1390 | */ |
1391 | int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params, |
1392 | snd_pcm_hw_param_t var, int *dir) |
1393 | { |
1394 | if (hw_is_mask(var)) { |
1395 | const struct snd_mask *mask = hw_param_mask_c(params, var); |
1396 | if (!snd_mask_single(mask)) |
1397 | return -EINVAL; |
1398 | if (dir) |
1399 | *dir = 0; |
1400 | return snd_mask_value(mask); |
1401 | } |
1402 | if (hw_is_interval(var)) { |
1403 | const struct snd_interval *i = hw_param_interval_c(params, var); |
1404 | if (!snd_interval_single(i)) |
1405 | return -EINVAL; |
1406 | if (dir) |
1407 | *dir = i->openmin; |
1408 | return snd_interval_value(i); |
1409 | } |
1410 | return -EINVAL; |
1411 | } |
1412 | |
1413 | EXPORT_SYMBOL(snd_pcm_hw_param_value); |
1414 | |
1415 | void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, |
1416 | snd_pcm_hw_param_t var) |
1417 | { |
1418 | if (hw_is_mask(var)) { |
1419 | snd_mask_none(hw_param_mask(params, var)); |
1420 | params->cmask |= 1 << var; |
1421 | params->rmask |= 1 << var; |
1422 | } else if (hw_is_interval(var)) { |
1423 | snd_interval_none(hw_param_interval(params, var)); |
1424 | params->cmask |= 1 << var; |
1425 | params->rmask |= 1 << var; |
1426 | } else { |
1427 | snd_BUG(); |
1428 | } |
1429 | } |
1430 | |
1431 | EXPORT_SYMBOL(_snd_pcm_hw_param_setempty); |
1432 | |
1433 | static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params, |
1434 | snd_pcm_hw_param_t var) |
1435 | { |
1436 | int changed; |
1437 | if (hw_is_mask(var)) |
1438 | changed = snd_mask_refine_first(hw_param_mask(params, var)); |
1439 | else if (hw_is_interval(var)) |
1440 | changed = snd_interval_refine_first(hw_param_interval(params, var)); |
1441 | else |
1442 | return -EINVAL; |
1443 | if (changed) { |
1444 | params->cmask |= 1 << var; |
1445 | params->rmask |= 1 << var; |
1446 | } |
1447 | return changed; |
1448 | } |
1449 | |
1450 | |
1451 | /** |
1452 | * snd_pcm_hw_param_first - refine config space and return minimum value |
1453 | * @pcm: PCM instance |
1454 | * @params: the hw_params instance |
1455 | * @var: parameter to retrieve |
1456 | * @dir: pointer to the direction (-1,0,1) or %NULL |
1457 | * |
1458 | * Inside configuration space defined by @params remove from @var all |
1459 | * values > minimum. Reduce configuration space accordingly. |
1460 | * Return the minimum. |
1461 | */ |
1462 | int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm, |
1463 | struct snd_pcm_hw_params *params, |
1464 | snd_pcm_hw_param_t var, int *dir) |
1465 | { |
1466 | int changed = _snd_pcm_hw_param_first(params, var); |
1467 | if (changed < 0) |
1468 | return changed; |
1469 | if (params->rmask) { |
1470 | int err = snd_pcm_hw_refine(pcm, params); |
1471 | if (snd_BUG_ON(err < 0)) |
1472 | return err; |
1473 | } |
1474 | return snd_pcm_hw_param_value(params, var, dir); |
1475 | } |
1476 | |
1477 | EXPORT_SYMBOL(snd_pcm_hw_param_first); |
1478 | |
1479 | static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params, |
1480 | snd_pcm_hw_param_t var) |
1481 | { |
1482 | int changed; |
1483 | if (hw_is_mask(var)) |
1484 | changed = snd_mask_refine_last(hw_param_mask(params, var)); |
1485 | else if (hw_is_interval(var)) |
1486 | changed = snd_interval_refine_last(hw_param_interval(params, var)); |
1487 | else |
1488 | return -EINVAL; |
1489 | if (changed) { |
1490 | params->cmask |= 1 << var; |
1491 | params->rmask |= 1 << var; |
1492 | } |
1493 | return changed; |
1494 | } |
1495 | |
1496 | |
1497 | /** |
1498 | * snd_pcm_hw_param_last - refine config space and return maximum value |
1499 | * @pcm: PCM instance |
1500 | * @params: the hw_params instance |
1501 | * @var: parameter to retrieve |
1502 | * @dir: pointer to the direction (-1,0,1) or %NULL |
1503 | * |
1504 | * Inside configuration space defined by @params remove from @var all |
1505 | * values < maximum. Reduce configuration space accordingly. |
1506 | * Return the maximum. |
1507 | */ |
1508 | int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm, |
1509 | struct snd_pcm_hw_params *params, |
1510 | snd_pcm_hw_param_t var, int *dir) |
1511 | { |
1512 | int changed = _snd_pcm_hw_param_last(params, var); |
1513 | if (changed < 0) |
1514 | return changed; |
1515 | if (params->rmask) { |
1516 | int err = snd_pcm_hw_refine(pcm, params); |
1517 | if (snd_BUG_ON(err < 0)) |
1518 | return err; |
1519 | } |
1520 | return snd_pcm_hw_param_value(params, var, dir); |
1521 | } |
1522 | |
1523 | EXPORT_SYMBOL(snd_pcm_hw_param_last); |
1524 | |
1525 | /** |
1526 | * snd_pcm_hw_param_choose - choose a configuration defined by @params |
1527 | * @pcm: PCM instance |
1528 | * @params: the hw_params instance |
1529 | * |
1530 | * Choose one configuration from configuration space defined by @params. |
1531 | * The configuration chosen is that obtained fixing in this order: |
1532 | * first access, first format, first subformat, min channels, |
1533 | * min rate, min period time, max buffer size, min tick time |
1534 | */ |
1535 | int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm, |
1536 | struct snd_pcm_hw_params *params) |
1537 | { |
1538 | static int vars[] = { |
1539 | SNDRV_PCM_HW_PARAM_ACCESS, |
1540 | SNDRV_PCM_HW_PARAM_FORMAT, |
1541 | SNDRV_PCM_HW_PARAM_SUBFORMAT, |
1542 | SNDRV_PCM_HW_PARAM_CHANNELS, |
1543 | SNDRV_PCM_HW_PARAM_RATE, |
1544 | SNDRV_PCM_HW_PARAM_PERIOD_TIME, |
1545 | SNDRV_PCM_HW_PARAM_BUFFER_SIZE, |
1546 | SNDRV_PCM_HW_PARAM_TICK_TIME, |
1547 | -1 |
1548 | }; |
1549 | int err, *v; |
1550 | |
1551 | for (v = vars; *v != -1; v++) { |
1552 | if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE) |
1553 | err = snd_pcm_hw_param_first(pcm, params, *v, NULL); |
1554 | else |
1555 | err = snd_pcm_hw_param_last(pcm, params, *v, NULL); |
1556 | if (snd_BUG_ON(err < 0)) |
1557 | return err; |
1558 | } |
1559 | return 0; |
1560 | } |
1561 | |
1562 | static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream, |
1563 | void *arg) |
1564 | { |
1565 | struct snd_pcm_runtime *runtime = substream->runtime; |
1566 | unsigned long flags; |
1567 | snd_pcm_stream_lock_irqsave(substream, flags); |
1568 | if (snd_pcm_running(substream) && |
1569 | snd_pcm_update_hw_ptr(substream) >= 0) |
1570 | runtime->status->hw_ptr %= runtime->buffer_size; |
1571 | else |
1572 | runtime->status->hw_ptr = 0; |
1573 | snd_pcm_stream_unlock_irqrestore(substream, flags); |
1574 | return 0; |
1575 | } |
1576 | |
1577 | static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream, |
1578 | void *arg) |
1579 | { |
1580 | struct snd_pcm_channel_info *info = arg; |
1581 | struct snd_pcm_runtime *runtime = substream->runtime; |
1582 | int width; |
1583 | if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) { |
1584 | info->offset = -1; |
1585 | return 0; |
1586 | } |
1587 | width = snd_pcm_format_physical_width(runtime->format); |
1588 | if (width < 0) |
1589 | return width; |
1590 | info->offset = 0; |
1591 | switch (runtime->access) { |
1592 | case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED: |
1593 | case SNDRV_PCM_ACCESS_RW_INTERLEAVED: |
1594 | info->first = info->channel * width; |
1595 | info->step = runtime->channels * width; |
1596 | break; |
1597 | case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED: |
1598 | case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED: |
1599 | { |
1600 | size_t size = runtime->dma_bytes / runtime->channels; |
1601 | info->first = info->channel * size * 8; |
1602 | info->step = width; |
1603 | break; |
1604 | } |
1605 | default: |
1606 | snd_BUG(); |
1607 | break; |
1608 | } |
1609 | return 0; |
1610 | } |
1611 | |
1612 | static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream, |
1613 | void *arg) |
1614 | { |
1615 | struct snd_pcm_hw_params *params = arg; |
1616 | snd_pcm_format_t format; |
1617 | int channels, width; |
1618 | |
1619 | params->fifo_size = substream->runtime->hw.fifo_size; |
1620 | if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) { |
1621 | format = params_format(params); |
1622 | channels = params_channels(params); |
1623 | width = snd_pcm_format_physical_width(format); |
1624 | params->fifo_size /= width * channels; |
1625 | } |
1626 | return 0; |
1627 | } |
1628 | |
1629 | /** |
1630 | * snd_pcm_lib_ioctl - a generic PCM ioctl callback |
1631 | * @substream: the pcm substream instance |
1632 | * @cmd: ioctl command |
1633 | * @arg: ioctl argument |
1634 | * |
1635 | * Processes the generic ioctl commands for PCM. |
1636 | * Can be passed as the ioctl callback for PCM ops. |
1637 | * |
1638 | * Returns zero if successful, or a negative error code on failure. |
1639 | */ |
1640 | int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream, |
1641 | unsigned int cmd, void *arg) |
1642 | { |
1643 | switch (cmd) { |
1644 | case SNDRV_PCM_IOCTL1_INFO: |
1645 | return 0; |
1646 | case SNDRV_PCM_IOCTL1_RESET: |
1647 | return snd_pcm_lib_ioctl_reset(substream, arg); |
1648 | case SNDRV_PCM_IOCTL1_CHANNEL_INFO: |
1649 | return snd_pcm_lib_ioctl_channel_info(substream, arg); |
1650 | case SNDRV_PCM_IOCTL1_FIFO_SIZE: |
1651 | return snd_pcm_lib_ioctl_fifo_size(substream, arg); |
1652 | } |
1653 | return -ENXIO; |
1654 | } |
1655 | |
1656 | EXPORT_SYMBOL(snd_pcm_lib_ioctl); |
1657 | |
1658 | /** |
1659 | * snd_pcm_period_elapsed - update the pcm status for the next period |
1660 | * @substream: the pcm substream instance |
1661 | * |
1662 | * This function is called from the interrupt handler when the |
1663 | * PCM has processed the period size. It will update the current |
1664 | * pointer, wake up sleepers, etc. |
1665 | * |
1666 | * Even if more than one periods have elapsed since the last call, you |
1667 | * have to call this only once. |
1668 | */ |
1669 | void snd_pcm_period_elapsed(struct snd_pcm_substream *substream) |
1670 | { |
1671 | struct snd_pcm_runtime *runtime; |
1672 | unsigned long flags; |
1673 | |
1674 | if (PCM_RUNTIME_CHECK(substream)) |
1675 | return; |
1676 | runtime = substream->runtime; |
1677 | |
1678 | if (runtime->transfer_ack_begin) |
1679 | runtime->transfer_ack_begin(substream); |
1680 | |
1681 | snd_pcm_stream_lock_irqsave(substream, flags); |
1682 | if (!snd_pcm_running(substream) || |
1683 | snd_pcm_update_hw_ptr0(substream, 1) < 0) |
1684 | goto _end; |
1685 | |
1686 | if (substream->timer_running) |
1687 | snd_timer_interrupt(substream->timer, 1); |
1688 | _end: |
1689 | snd_pcm_stream_unlock_irqrestore(substream, flags); |
1690 | if (runtime->transfer_ack_end) |
1691 | runtime->transfer_ack_end(substream); |
1692 | kill_fasync(&runtime->fasync, SIGIO, POLL_IN); |
1693 | } |
1694 | |
1695 | EXPORT_SYMBOL(snd_pcm_period_elapsed); |
1696 | |
1697 | /* |
1698 | * Wait until avail_min data becomes available |
1699 | * Returns a negative error code if any error occurs during operation. |
1700 | * The available space is stored on availp. When err = 0 and avail = 0 |
1701 | * on the capture stream, it indicates the stream is in DRAINING state. |
1702 | */ |
1703 | static int wait_for_avail_min(struct snd_pcm_substream *substream, |
1704 | snd_pcm_uframes_t *availp) |
1705 | { |
1706 | struct snd_pcm_runtime *runtime = substream->runtime; |
1707 | int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK; |
1708 | wait_queue_t wait; |
1709 | int err = 0; |
1710 | snd_pcm_uframes_t avail = 0; |
1711 | long tout; |
1712 | |
1713 | init_waitqueue_entry(&wait, current); |
1714 | add_wait_queue(&runtime->tsleep, &wait); |
1715 | for (;;) { |
1716 | if (signal_pending(current)) { |
1717 | err = -ERESTARTSYS; |
1718 | break; |
1719 | } |
1720 | set_current_state(TASK_INTERRUPTIBLE); |
1721 | snd_pcm_stream_unlock_irq(substream); |
1722 | tout = schedule_timeout(msecs_to_jiffies(10000)); |
1723 | snd_pcm_stream_lock_irq(substream); |
1724 | switch (runtime->status->state) { |
1725 | case SNDRV_PCM_STATE_SUSPENDED: |
1726 | err = -ESTRPIPE; |
1727 | goto _endloop; |
1728 | case SNDRV_PCM_STATE_XRUN: |
1729 | err = -EPIPE; |
1730 | goto _endloop; |
1731 | case SNDRV_PCM_STATE_DRAINING: |
1732 | if (is_playback) |
1733 | err = -EPIPE; |
1734 | else |
1735 | avail = 0; /* indicate draining */ |
1736 | goto _endloop; |
1737 | case SNDRV_PCM_STATE_OPEN: |
1738 | case SNDRV_PCM_STATE_SETUP: |
1739 | case SNDRV_PCM_STATE_DISCONNECTED: |
1740 | err = -EBADFD; |
1741 | goto _endloop; |
1742 | } |
1743 | if (!tout) { |
1744 | snd_printd("%s write error (DMA or IRQ trouble?)\n", |
1745 | is_playback ? "playback" : "capture"); |
1746 | err = -EIO; |
1747 | break; |
1748 | } |
1749 | if (is_playback) |
1750 | avail = snd_pcm_playback_avail(runtime); |
1751 | else |
1752 | avail = snd_pcm_capture_avail(runtime); |
1753 | if (avail >= runtime->control->avail_min) |
1754 | break; |
1755 | } |
1756 | _endloop: |
1757 | remove_wait_queue(&runtime->tsleep, &wait); |
1758 | *availp = avail; |
1759 | return err; |
1760 | } |
1761 | |
1762 | static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream, |
1763 | unsigned int hwoff, |
1764 | unsigned long data, unsigned int off, |
1765 | snd_pcm_uframes_t frames) |
1766 | { |
1767 | struct snd_pcm_runtime *runtime = substream->runtime; |
1768 | int err; |
1769 | char __user *buf = (char __user *) data + frames_to_bytes(runtime, off); |
1770 | if (substream->ops->copy) { |
1771 | if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0) |
1772 | return err; |
1773 | } else { |
1774 | char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff); |
1775 | if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames))) |
1776 | return -EFAULT; |
1777 | } |
1778 | return 0; |
1779 | } |
1780 | |
1781 | typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff, |
1782 | unsigned long data, unsigned int off, |
1783 | snd_pcm_uframes_t size); |
1784 | |
1785 | static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream, |
1786 | unsigned long data, |
1787 | snd_pcm_uframes_t size, |
1788 | int nonblock, |
1789 | transfer_f transfer) |
1790 | { |
1791 | struct snd_pcm_runtime *runtime = substream->runtime; |
1792 | snd_pcm_uframes_t xfer = 0; |
1793 | snd_pcm_uframes_t offset = 0; |
1794 | int err = 0; |
1795 | |
1796 | if (size == 0) |
1797 | return 0; |
1798 | |
1799 | snd_pcm_stream_lock_irq(substream); |
1800 | switch (runtime->status->state) { |
1801 | case SNDRV_PCM_STATE_PREPARED: |
1802 | case SNDRV_PCM_STATE_RUNNING: |
1803 | case SNDRV_PCM_STATE_PAUSED: |
1804 | break; |
1805 | case SNDRV_PCM_STATE_XRUN: |
1806 | err = -EPIPE; |
1807 | goto _end_unlock; |
1808 | case SNDRV_PCM_STATE_SUSPENDED: |
1809 | err = -ESTRPIPE; |
1810 | goto _end_unlock; |
1811 | default: |
1812 | err = -EBADFD; |
1813 | goto _end_unlock; |
1814 | } |
1815 | |
1816 | runtime->twake = 1; |
1817 | while (size > 0) { |
1818 | snd_pcm_uframes_t frames, appl_ptr, appl_ofs; |
1819 | snd_pcm_uframes_t avail; |
1820 | snd_pcm_uframes_t cont; |
1821 | if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) |
1822 | snd_pcm_update_hw_ptr(substream); |
1823 | avail = snd_pcm_playback_avail(runtime); |
1824 | if (!avail) { |
1825 | if (nonblock) { |
1826 | err = -EAGAIN; |
1827 | goto _end_unlock; |
1828 | } |
1829 | err = wait_for_avail_min(substream, &avail); |
1830 | if (err < 0) |
1831 | goto _end_unlock; |
1832 | } |
1833 | frames = size > avail ? avail : size; |
1834 | cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size; |
1835 | if (frames > cont) |
1836 | frames = cont; |
1837 | if (snd_BUG_ON(!frames)) { |
1838 | runtime->twake = 0; |
1839 | snd_pcm_stream_unlock_irq(substream); |
1840 | return -EINVAL; |
1841 | } |
1842 | appl_ptr = runtime->control->appl_ptr; |
1843 | appl_ofs = appl_ptr % runtime->buffer_size; |
1844 | snd_pcm_stream_unlock_irq(substream); |
1845 | err = transfer(substream, appl_ofs, data, offset, frames); |
1846 | snd_pcm_stream_lock_irq(substream); |
1847 | if (err < 0) |
1848 | goto _end_unlock; |
1849 | switch (runtime->status->state) { |
1850 | case SNDRV_PCM_STATE_XRUN: |
1851 | err = -EPIPE; |
1852 | goto _end_unlock; |
1853 | case SNDRV_PCM_STATE_SUSPENDED: |
1854 | err = -ESTRPIPE; |
1855 | goto _end_unlock; |
1856 | default: |
1857 | break; |
1858 | } |
1859 | appl_ptr += frames; |
1860 | if (appl_ptr >= runtime->boundary) |
1861 | appl_ptr -= runtime->boundary; |
1862 | runtime->control->appl_ptr = appl_ptr; |
1863 | if (substream->ops->ack) |
1864 | substream->ops->ack(substream); |
1865 | |
1866 | offset += frames; |
1867 | size -= frames; |
1868 | xfer += frames; |
1869 | if (runtime->status->state == SNDRV_PCM_STATE_PREPARED && |
1870 | snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) { |
1871 | err = snd_pcm_start(substream); |
1872 | if (err < 0) |
1873 | goto _end_unlock; |
1874 | } |
1875 | } |
1876 | _end_unlock: |
1877 | runtime->twake = 0; |
1878 | if (xfer > 0 && err >= 0) |
1879 | snd_pcm_update_state(substream, runtime); |
1880 | snd_pcm_stream_unlock_irq(substream); |
1881 | return xfer > 0 ? (snd_pcm_sframes_t)xfer : err; |
1882 | } |
1883 | |
1884 | /* sanity-check for read/write methods */ |
1885 | static int pcm_sanity_check(struct snd_pcm_substream *substream) |
1886 | { |
1887 | struct snd_pcm_runtime *runtime; |
1888 | if (PCM_RUNTIME_CHECK(substream)) |
1889 | return -ENXIO; |
1890 | runtime = substream->runtime; |
1891 | if (snd_BUG_ON(!substream->ops->copy && !runtime->dma_area)) |
1892 | return -EINVAL; |
1893 | if (runtime->status->state == SNDRV_PCM_STATE_OPEN) |
1894 | return -EBADFD; |
1895 | return 0; |
1896 | } |
1897 | |
1898 | snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, const void __user *buf, snd_pcm_uframes_t size) |
1899 | { |
1900 | struct snd_pcm_runtime *runtime; |
1901 | int nonblock; |
1902 | int err; |
1903 | |
1904 | err = pcm_sanity_check(substream); |
1905 | if (err < 0) |
1906 | return err; |
1907 | runtime = substream->runtime; |
1908 | nonblock = !!(substream->f_flags & O_NONBLOCK); |
1909 | |
1910 | if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED && |
1911 | runtime->channels > 1) |
1912 | return -EINVAL; |
1913 | return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock, |
1914 | snd_pcm_lib_write_transfer); |
1915 | } |
1916 | |
1917 | EXPORT_SYMBOL(snd_pcm_lib_write); |
1918 | |
1919 | static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream, |
1920 | unsigned int hwoff, |
1921 | unsigned long data, unsigned int off, |
1922 | snd_pcm_uframes_t frames) |
1923 | { |
1924 | struct snd_pcm_runtime *runtime = substream->runtime; |
1925 | int err; |
1926 | void __user **bufs = (void __user **)data; |
1927 | int channels = runtime->channels; |
1928 | int c; |
1929 | if (substream->ops->copy) { |
1930 | if (snd_BUG_ON(!substream->ops->silence)) |
1931 | return -EINVAL; |
1932 | for (c = 0; c < channels; ++c, ++bufs) { |
1933 | if (*bufs == NULL) { |
1934 | if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0) |
1935 | return err; |
1936 | } else { |
1937 | char __user *buf = *bufs + samples_to_bytes(runtime, off); |
1938 | if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0) |
1939 | return err; |
1940 | } |
1941 | } |
1942 | } else { |
1943 | /* default transfer behaviour */ |
1944 | size_t dma_csize = runtime->dma_bytes / channels; |
1945 | for (c = 0; c < channels; ++c, ++bufs) { |
1946 | char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff); |
1947 | if (*bufs == NULL) { |
1948 | snd_pcm_format_set_silence(runtime->format, hwbuf, frames); |
1949 | } else { |
1950 | char __user *buf = *bufs + samples_to_bytes(runtime, off); |
1951 | if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames))) |
1952 | return -EFAULT; |
1953 | } |
1954 | } |
1955 | } |
1956 | return 0; |
1957 | } |
1958 | |
1959 | snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream, |
1960 | void __user **bufs, |
1961 | snd_pcm_uframes_t frames) |
1962 | { |
1963 | struct snd_pcm_runtime *runtime; |
1964 | int nonblock; |
1965 | int err; |
1966 | |
1967 | err = pcm_sanity_check(substream); |
1968 | if (err < 0) |
1969 | return err; |
1970 | runtime = substream->runtime; |
1971 | nonblock = !!(substream->f_flags & O_NONBLOCK); |
1972 | |
1973 | if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) |
1974 | return -EINVAL; |
1975 | return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames, |
1976 | nonblock, snd_pcm_lib_writev_transfer); |
1977 | } |
1978 | |
1979 | EXPORT_SYMBOL(snd_pcm_lib_writev); |
1980 | |
1981 | static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream, |
1982 | unsigned int hwoff, |
1983 | unsigned long data, unsigned int off, |
1984 | snd_pcm_uframes_t frames) |
1985 | { |
1986 | struct snd_pcm_runtime *runtime = substream->runtime; |
1987 | int err; |
1988 | char __user *buf = (char __user *) data + frames_to_bytes(runtime, off); |
1989 | if (substream->ops->copy) { |
1990 | if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0) |
1991 | return err; |
1992 | } else { |
1993 | char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff); |
1994 | if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames))) |
1995 | return -EFAULT; |
1996 | } |
1997 | return 0; |
1998 | } |
1999 | |
2000 | static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream, |
2001 | unsigned long data, |
2002 | snd_pcm_uframes_t size, |
2003 | int nonblock, |
2004 | transfer_f transfer) |
2005 | { |
2006 | struct snd_pcm_runtime *runtime = substream->runtime; |
2007 | snd_pcm_uframes_t xfer = 0; |
2008 | snd_pcm_uframes_t offset = 0; |
2009 | int err = 0; |
2010 | |
2011 | if (size == 0) |
2012 | return 0; |
2013 | |
2014 | snd_pcm_stream_lock_irq(substream); |
2015 | switch (runtime->status->state) { |
2016 | case SNDRV_PCM_STATE_PREPARED: |
2017 | if (size >= runtime->start_threshold) { |
2018 | err = snd_pcm_start(substream); |
2019 | if (err < 0) |
2020 | goto _end_unlock; |
2021 | } |
2022 | break; |
2023 | case SNDRV_PCM_STATE_DRAINING: |
2024 | case SNDRV_PCM_STATE_RUNNING: |
2025 | case SNDRV_PCM_STATE_PAUSED: |
2026 | break; |
2027 | case SNDRV_PCM_STATE_XRUN: |
2028 | err = -EPIPE; |
2029 | goto _end_unlock; |
2030 | case SNDRV_PCM_STATE_SUSPENDED: |
2031 | err = -ESTRPIPE; |
2032 | goto _end_unlock; |
2033 | default: |
2034 | err = -EBADFD; |
2035 | goto _end_unlock; |
2036 | } |
2037 | |
2038 | runtime->twake = 1; |
2039 | while (size > 0) { |
2040 | snd_pcm_uframes_t frames, appl_ptr, appl_ofs; |
2041 | snd_pcm_uframes_t avail; |
2042 | snd_pcm_uframes_t cont; |
2043 | if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) |
2044 | snd_pcm_update_hw_ptr(substream); |
2045 | avail = snd_pcm_capture_avail(runtime); |
2046 | if (!avail) { |
2047 | if (runtime->status->state == |
2048 | SNDRV_PCM_STATE_DRAINING) { |
2049 | snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); |
2050 | goto _end_unlock; |
2051 | } |
2052 | if (nonblock) { |
2053 | err = -EAGAIN; |
2054 | goto _end_unlock; |
2055 | } |
2056 | err = wait_for_avail_min(substream, &avail); |
2057 | if (err < 0) |
2058 | goto _end_unlock; |
2059 | if (!avail) |
2060 | continue; /* draining */ |
2061 | } |
2062 | frames = size > avail ? avail : size; |
2063 | cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size; |
2064 | if (frames > cont) |
2065 | frames = cont; |
2066 | if (snd_BUG_ON(!frames)) { |
2067 | runtime->twake = 0; |
2068 | snd_pcm_stream_unlock_irq(substream); |
2069 | return -EINVAL; |
2070 | } |
2071 | appl_ptr = runtime->control->appl_ptr; |
2072 | appl_ofs = appl_ptr % runtime->buffer_size; |
2073 | snd_pcm_stream_unlock_irq(substream); |
2074 | err = transfer(substream, appl_ofs, data, offset, frames); |
2075 | snd_pcm_stream_lock_irq(substream); |
2076 | if (err < 0) |
2077 | goto _end_unlock; |
2078 | switch (runtime->status->state) { |
2079 | case SNDRV_PCM_STATE_XRUN: |
2080 | err = -EPIPE; |
2081 | goto _end_unlock; |
2082 | case SNDRV_PCM_STATE_SUSPENDED: |
2083 | err = -ESTRPIPE; |
2084 | goto _end_unlock; |
2085 | default: |
2086 | break; |
2087 | } |
2088 | appl_ptr += frames; |
2089 | if (appl_ptr >= runtime->boundary) |
2090 | appl_ptr -= runtime->boundary; |
2091 | runtime->control->appl_ptr = appl_ptr; |
2092 | if (substream->ops->ack) |
2093 | substream->ops->ack(substream); |
2094 | |
2095 | offset += frames; |
2096 | size -= frames; |
2097 | xfer += frames; |
2098 | } |
2099 | _end_unlock: |
2100 | runtime->twake = 0; |
2101 | if (xfer > 0 && err >= 0) |
2102 | snd_pcm_update_state(substream, runtime); |
2103 | snd_pcm_stream_unlock_irq(substream); |
2104 | return xfer > 0 ? (snd_pcm_sframes_t)xfer : err; |
2105 | } |
2106 | |
2107 | snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, void __user *buf, snd_pcm_uframes_t size) |
2108 | { |
2109 | struct snd_pcm_runtime *runtime; |
2110 | int nonblock; |
2111 | int err; |
2112 | |
2113 | err = pcm_sanity_check(substream); |
2114 | if (err < 0) |
2115 | return err; |
2116 | runtime = substream->runtime; |
2117 | nonblock = !!(substream->f_flags & O_NONBLOCK); |
2118 | if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED) |
2119 | return -EINVAL; |
2120 | return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer); |
2121 | } |
2122 | |
2123 | EXPORT_SYMBOL(snd_pcm_lib_read); |
2124 | |
2125 | static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream, |
2126 | unsigned int hwoff, |
2127 | unsigned long data, unsigned int off, |
2128 | snd_pcm_uframes_t frames) |
2129 | { |
2130 | struct snd_pcm_runtime *runtime = substream->runtime; |
2131 | int err; |
2132 | void __user **bufs = (void __user **)data; |
2133 | int channels = runtime->channels; |
2134 | int c; |
2135 | if (substream->ops->copy) { |
2136 | for (c = 0; c < channels; ++c, ++bufs) { |
2137 | char __user *buf; |
2138 | if (*bufs == NULL) |
2139 | continue; |
2140 | buf = *bufs + samples_to_bytes(runtime, off); |
2141 | if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0) |
2142 | return err; |
2143 | } |
2144 | } else { |
2145 | snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels; |
2146 | for (c = 0; c < channels; ++c, ++bufs) { |
2147 | char *hwbuf; |
2148 | char __user *buf; |
2149 | if (*bufs == NULL) |
2150 | continue; |
2151 | |
2152 | hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff); |
2153 | buf = *bufs + samples_to_bytes(runtime, off); |
2154 | if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames))) |
2155 | return -EFAULT; |
2156 | } |
2157 | } |
2158 | return 0; |
2159 | } |
2160 | |
2161 | snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream, |
2162 | void __user **bufs, |
2163 | snd_pcm_uframes_t frames) |
2164 | { |
2165 | struct snd_pcm_runtime *runtime; |
2166 | int nonblock; |
2167 | int err; |
2168 | |
2169 | err = pcm_sanity_check(substream); |
2170 | if (err < 0) |
2171 | return err; |
2172 | runtime = substream->runtime; |
2173 | if (runtime->status->state == SNDRV_PCM_STATE_OPEN) |
2174 | return -EBADFD; |
2175 | |
2176 | nonblock = !!(substream->f_flags & O_NONBLOCK); |
2177 | if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) |
2178 | return -EINVAL; |
2179 | return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer); |
2180 | } |
2181 | |
2182 | EXPORT_SYMBOL(snd_pcm_lib_readv); |
2183 |
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javiroman/ks7010
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
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