Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Digital Audio (PCM) abstract layer | |
3 | * Copyright (c) by Jaroslav Kysela <perex@suse.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 <sound/driver.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/time.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 | */ | |
877211f5 | 42 | void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr) |
1da177e4 | 43 | { |
877211f5 | 44 | struct snd_pcm_runtime *runtime = substream->runtime; |
1da177e4 LT |
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 | } | |
235475cb | 59 | if (runtime->silence_filled >= runtime->buffer_size) |
1da177e4 | 60 | return; |
1da177e4 LT |
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; | |
9a826ddb | 82 | runtime->silence_start = new_hw_ptr; |
1da177e4 | 83 | } else { |
9a826ddb | 84 | runtime->silence_start = ofs; |
1da177e4 | 85 | } |
1da177e4 LT |
86 | } |
87 | frames = runtime->buffer_size - runtime->silence_filled; | |
88 | } | |
89 | snd_assert(frames <= runtime->buffer_size, return); | |
90 | if (frames == 0) | |
91 | return; | |
9a826ddb | 92 | ofs = runtime->silence_start % runtime->buffer_size; |
1da177e4 LT |
93 | while (frames > 0) { |
94 | transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames; | |
95 | if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || | |
96 | runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) { | |
97 | if (substream->ops->silence) { | |
98 | int err; | |
99 | err = substream->ops->silence(substream, -1, ofs, transfer); | |
100 | snd_assert(err >= 0, ); | |
101 | } else { | |
102 | char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs); | |
103 | snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels); | |
104 | } | |
105 | } else { | |
106 | unsigned int c; | |
107 | unsigned int channels = runtime->channels; | |
108 | if (substream->ops->silence) { | |
109 | for (c = 0; c < channels; ++c) { | |
110 | int err; | |
111 | err = substream->ops->silence(substream, c, ofs, transfer); | |
112 | snd_assert(err >= 0, ); | |
113 | } | |
114 | } else { | |
115 | size_t dma_csize = runtime->dma_bytes / channels; | |
116 | for (c = 0; c < channels; ++c) { | |
117 | char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs); | |
118 | snd_pcm_format_set_silence(runtime->format, hwbuf, transfer); | |
119 | } | |
120 | } | |
121 | } | |
122 | runtime->silence_filled += transfer; | |
123 | frames -= transfer; | |
124 | ofs = 0; | |
125 | } | |
126 | } | |
127 | ||
877211f5 | 128 | static void xrun(struct snd_pcm_substream *substream) |
1da177e4 LT |
129 | { |
130 | snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); | |
61fb63c0 | 131 | #ifdef CONFIG_SND_PCM_XRUN_DEBUG |
1da177e4 LT |
132 | if (substream->pstr->xrun_debug) { |
133 | snd_printd(KERN_DEBUG "XRUN: pcmC%dD%d%c\n", | |
134 | substream->pcm->card->number, | |
135 | substream->pcm->device, | |
136 | substream->stream ? 'c' : 'p'); | |
137 | if (substream->pstr->xrun_debug > 1) | |
138 | dump_stack(); | |
139 | } | |
140 | #endif | |
141 | } | |
142 | ||
877211f5 TI |
143 | static inline snd_pcm_uframes_t snd_pcm_update_hw_ptr_pos(struct snd_pcm_substream *substream, |
144 | struct snd_pcm_runtime *runtime) | |
1da177e4 LT |
145 | { |
146 | snd_pcm_uframes_t pos; | |
147 | ||
148 | pos = substream->ops->pointer(substream); | |
149 | if (pos == SNDRV_PCM_POS_XRUN) | |
150 | return pos; /* XRUN */ | |
151 | if (runtime->tstamp_mode & SNDRV_PCM_TSTAMP_MMAP) | |
07799e75 | 152 | getnstimeofday((struct timespec *)&runtime->status->tstamp); |
1da177e4 LT |
153 | #ifdef CONFIG_SND_DEBUG |
154 | if (pos >= runtime->buffer_size) { | |
155 | snd_printk(KERN_ERR "BUG: stream = %i, pos = 0x%lx, buffer size = 0x%lx, period size = 0x%lx\n", substream->stream, pos, runtime->buffer_size, runtime->period_size); | |
7c22f1aa | 156 | } |
1da177e4 | 157 | #endif |
1da177e4 LT |
158 | pos -= pos % runtime->min_align; |
159 | return pos; | |
160 | } | |
161 | ||
877211f5 TI |
162 | static inline int snd_pcm_update_hw_ptr_post(struct snd_pcm_substream *substream, |
163 | struct snd_pcm_runtime *runtime) | |
1da177e4 LT |
164 | { |
165 | snd_pcm_uframes_t avail; | |
166 | ||
167 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
168 | avail = snd_pcm_playback_avail(runtime); | |
169 | else | |
170 | avail = snd_pcm_capture_avail(runtime); | |
171 | if (avail > runtime->avail_max) | |
172 | runtime->avail_max = avail; | |
173 | if (avail >= runtime->stop_threshold) { | |
174 | if (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING) | |
175 | snd_pcm_drain_done(substream); | |
176 | else | |
177 | xrun(substream); | |
178 | return -EPIPE; | |
179 | } | |
180 | if (avail >= runtime->control->avail_min) | |
181 | wake_up(&runtime->sleep); | |
182 | return 0; | |
183 | } | |
184 | ||
877211f5 | 185 | static inline int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream *substream) |
1da177e4 | 186 | { |
877211f5 | 187 | struct snd_pcm_runtime *runtime = substream->runtime; |
1da177e4 LT |
188 | snd_pcm_uframes_t pos; |
189 | snd_pcm_uframes_t new_hw_ptr, hw_ptr_interrupt; | |
190 | snd_pcm_sframes_t delta; | |
191 | ||
192 | pos = snd_pcm_update_hw_ptr_pos(substream, runtime); | |
193 | if (pos == SNDRV_PCM_POS_XRUN) { | |
194 | xrun(substream); | |
195 | return -EPIPE; | |
196 | } | |
197 | if (runtime->period_size == runtime->buffer_size) | |
198 | goto __next_buf; | |
199 | new_hw_ptr = runtime->hw_ptr_base + pos; | |
200 | hw_ptr_interrupt = runtime->hw_ptr_interrupt + runtime->period_size; | |
201 | ||
202 | delta = hw_ptr_interrupt - new_hw_ptr; | |
203 | if (delta > 0) { | |
204 | if ((snd_pcm_uframes_t)delta < runtime->buffer_size / 2) { | |
61fb63c0 | 205 | #ifdef CONFIG_SND_PCM_XRUN_DEBUG |
1da177e4 LT |
206 | if (runtime->periods > 1 && substream->pstr->xrun_debug) { |
207 | snd_printd(KERN_ERR "Unexpected hw_pointer value [1] (stream = %i, delta: -%ld, max jitter = %ld): wrong interrupt acknowledge?\n", substream->stream, (long) delta, runtime->buffer_size / 2); | |
208 | if (substream->pstr->xrun_debug > 1) | |
209 | dump_stack(); | |
210 | } | |
211 | #endif | |
212 | return 0; | |
213 | } | |
214 | __next_buf: | |
215 | runtime->hw_ptr_base += runtime->buffer_size; | |
216 | if (runtime->hw_ptr_base == runtime->boundary) | |
217 | runtime->hw_ptr_base = 0; | |
218 | new_hw_ptr = runtime->hw_ptr_base + pos; | |
219 | } | |
220 | ||
221 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && | |
222 | runtime->silence_size > 0) | |
223 | snd_pcm_playback_silence(substream, new_hw_ptr); | |
224 | ||
225 | runtime->status->hw_ptr = new_hw_ptr; | |
226 | runtime->hw_ptr_interrupt = new_hw_ptr - new_hw_ptr % runtime->period_size; | |
227 | ||
228 | return snd_pcm_update_hw_ptr_post(substream, runtime); | |
229 | } | |
230 | ||
231 | /* CAUTION: call it with irq disabled */ | |
877211f5 | 232 | int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream) |
1da177e4 | 233 | { |
877211f5 | 234 | struct snd_pcm_runtime *runtime = substream->runtime; |
1da177e4 LT |
235 | snd_pcm_uframes_t pos; |
236 | snd_pcm_uframes_t old_hw_ptr, new_hw_ptr; | |
237 | snd_pcm_sframes_t delta; | |
238 | ||
239 | old_hw_ptr = runtime->status->hw_ptr; | |
240 | pos = snd_pcm_update_hw_ptr_pos(substream, runtime); | |
241 | if (pos == SNDRV_PCM_POS_XRUN) { | |
242 | xrun(substream); | |
243 | return -EPIPE; | |
244 | } | |
245 | new_hw_ptr = runtime->hw_ptr_base + pos; | |
246 | ||
247 | delta = old_hw_ptr - new_hw_ptr; | |
248 | if (delta > 0) { | |
249 | if ((snd_pcm_uframes_t)delta < runtime->buffer_size / 2) { | |
61fb63c0 | 250 | #ifdef CONFIG_SND_PCM_XRUN_DEBUG |
1da177e4 LT |
251 | if (runtime->periods > 2 && substream->pstr->xrun_debug) { |
252 | snd_printd(KERN_ERR "Unexpected hw_pointer value [2] (stream = %i, delta: -%ld, max jitter = %ld): wrong interrupt acknowledge?\n", substream->stream, (long) delta, runtime->buffer_size / 2); | |
253 | if (substream->pstr->xrun_debug > 1) | |
254 | dump_stack(); | |
255 | } | |
256 | #endif | |
257 | return 0; | |
258 | } | |
259 | runtime->hw_ptr_base += runtime->buffer_size; | |
260 | if (runtime->hw_ptr_base == runtime->boundary) | |
261 | runtime->hw_ptr_base = 0; | |
262 | new_hw_ptr = runtime->hw_ptr_base + pos; | |
263 | } | |
264 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && | |
265 | runtime->silence_size > 0) | |
266 | snd_pcm_playback_silence(substream, new_hw_ptr); | |
267 | ||
268 | runtime->status->hw_ptr = new_hw_ptr; | |
269 | ||
270 | return snd_pcm_update_hw_ptr_post(substream, runtime); | |
271 | } | |
272 | ||
273 | /** | |
274 | * snd_pcm_set_ops - set the PCM operators | |
275 | * @pcm: the pcm instance | |
276 | * @direction: stream direction, SNDRV_PCM_STREAM_XXX | |
277 | * @ops: the operator table | |
278 | * | |
279 | * Sets the given PCM operators to the pcm instance. | |
280 | */ | |
877211f5 | 281 | void snd_pcm_set_ops(struct snd_pcm *pcm, int direction, struct snd_pcm_ops *ops) |
1da177e4 | 282 | { |
877211f5 TI |
283 | struct snd_pcm_str *stream = &pcm->streams[direction]; |
284 | struct snd_pcm_substream *substream; | |
1da177e4 LT |
285 | |
286 | for (substream = stream->substream; substream != NULL; substream = substream->next) | |
287 | substream->ops = ops; | |
288 | } | |
289 | ||
e88e8ae6 | 290 | EXPORT_SYMBOL(snd_pcm_set_ops); |
1da177e4 LT |
291 | |
292 | /** | |
293 | * snd_pcm_sync - set the PCM sync id | |
294 | * @substream: the pcm substream | |
295 | * | |
296 | * Sets the PCM sync identifier for the card. | |
297 | */ | |
877211f5 | 298 | void snd_pcm_set_sync(struct snd_pcm_substream *substream) |
1da177e4 | 299 | { |
877211f5 | 300 | struct snd_pcm_runtime *runtime = substream->runtime; |
1da177e4 LT |
301 | |
302 | runtime->sync.id32[0] = substream->pcm->card->number; | |
303 | runtime->sync.id32[1] = -1; | |
304 | runtime->sync.id32[2] = -1; | |
305 | runtime->sync.id32[3] = -1; | |
306 | } | |
307 | ||
e88e8ae6 TI |
308 | EXPORT_SYMBOL(snd_pcm_set_sync); |
309 | ||
1da177e4 LT |
310 | /* |
311 | * Standard ioctl routine | |
312 | */ | |
313 | ||
1da177e4 LT |
314 | static inline unsigned int div32(unsigned int a, unsigned int b, |
315 | unsigned int *r) | |
316 | { | |
317 | if (b == 0) { | |
318 | *r = 0; | |
319 | return UINT_MAX; | |
320 | } | |
321 | *r = a % b; | |
322 | return a / b; | |
323 | } | |
324 | ||
325 | static inline unsigned int div_down(unsigned int a, unsigned int b) | |
326 | { | |
327 | if (b == 0) | |
328 | return UINT_MAX; | |
329 | return a / b; | |
330 | } | |
331 | ||
332 | static inline unsigned int div_up(unsigned int a, unsigned int b) | |
333 | { | |
334 | unsigned int r; | |
335 | unsigned int q; | |
336 | if (b == 0) | |
337 | return UINT_MAX; | |
338 | q = div32(a, b, &r); | |
339 | if (r) | |
340 | ++q; | |
341 | return q; | |
342 | } | |
343 | ||
344 | static inline unsigned int mul(unsigned int a, unsigned int b) | |
345 | { | |
346 | if (a == 0) | |
347 | return 0; | |
348 | if (div_down(UINT_MAX, a) < b) | |
349 | return UINT_MAX; | |
350 | return a * b; | |
351 | } | |
352 | ||
353 | static inline unsigned int muldiv32(unsigned int a, unsigned int b, | |
354 | unsigned int c, unsigned int *r) | |
355 | { | |
356 | u_int64_t n = (u_int64_t) a * b; | |
357 | if (c == 0) { | |
358 | snd_assert(n > 0, ); | |
359 | *r = 0; | |
360 | return UINT_MAX; | |
361 | } | |
362 | div64_32(&n, c, r); | |
363 | if (n >= UINT_MAX) { | |
364 | *r = 0; | |
365 | return UINT_MAX; | |
366 | } | |
367 | return n; | |
368 | } | |
369 | ||
1da177e4 LT |
370 | /** |
371 | * snd_interval_refine - refine the interval value of configurator | |
372 | * @i: the interval value to refine | |
373 | * @v: the interval value to refer to | |
374 | * | |
375 | * Refines the interval value with the reference value. | |
376 | * The interval is changed to the range satisfying both intervals. | |
377 | * The interval status (min, max, integer, etc.) are evaluated. | |
378 | * | |
379 | * Returns non-zero if the value is changed, zero if not changed. | |
380 | */ | |
877211f5 | 381 | int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v) |
1da177e4 LT |
382 | { |
383 | int changed = 0; | |
e88e8ae6 | 384 | snd_assert(!snd_interval_empty(i), return -EINVAL); |
1da177e4 LT |
385 | if (i->min < v->min) { |
386 | i->min = v->min; | |
387 | i->openmin = v->openmin; | |
388 | changed = 1; | |
389 | } else if (i->min == v->min && !i->openmin && v->openmin) { | |
390 | i->openmin = 1; | |
391 | changed = 1; | |
392 | } | |
393 | if (i->max > v->max) { | |
394 | i->max = v->max; | |
395 | i->openmax = v->openmax; | |
396 | changed = 1; | |
397 | } else if (i->max == v->max && !i->openmax && v->openmax) { | |
398 | i->openmax = 1; | |
399 | changed = 1; | |
400 | } | |
401 | if (!i->integer && v->integer) { | |
402 | i->integer = 1; | |
403 | changed = 1; | |
404 | } | |
405 | if (i->integer) { | |
406 | if (i->openmin) { | |
407 | i->min++; | |
408 | i->openmin = 0; | |
409 | } | |
410 | if (i->openmax) { | |
411 | i->max--; | |
412 | i->openmax = 0; | |
413 | } | |
414 | } else if (!i->openmin && !i->openmax && i->min == i->max) | |
415 | i->integer = 1; | |
416 | if (snd_interval_checkempty(i)) { | |
417 | snd_interval_none(i); | |
418 | return -EINVAL; | |
419 | } | |
420 | return changed; | |
421 | } | |
422 | ||
e88e8ae6 TI |
423 | EXPORT_SYMBOL(snd_interval_refine); |
424 | ||
877211f5 | 425 | static int snd_interval_refine_first(struct snd_interval *i) |
1da177e4 | 426 | { |
e88e8ae6 | 427 | snd_assert(!snd_interval_empty(i), return -EINVAL); |
1da177e4 LT |
428 | if (snd_interval_single(i)) |
429 | return 0; | |
430 | i->max = i->min; | |
431 | i->openmax = i->openmin; | |
432 | if (i->openmax) | |
433 | i->max++; | |
434 | return 1; | |
435 | } | |
436 | ||
877211f5 | 437 | static int snd_interval_refine_last(struct snd_interval *i) |
1da177e4 | 438 | { |
e88e8ae6 | 439 | snd_assert(!snd_interval_empty(i), return -EINVAL); |
1da177e4 LT |
440 | if (snd_interval_single(i)) |
441 | return 0; | |
442 | i->min = i->max; | |
443 | i->openmin = i->openmax; | |
444 | if (i->openmin) | |
445 | i->min--; | |
446 | return 1; | |
447 | } | |
448 | ||
877211f5 | 449 | void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c) |
1da177e4 LT |
450 | { |
451 | if (a->empty || b->empty) { | |
452 | snd_interval_none(c); | |
453 | return; | |
454 | } | |
455 | c->empty = 0; | |
456 | c->min = mul(a->min, b->min); | |
457 | c->openmin = (a->openmin || b->openmin); | |
458 | c->max = mul(a->max, b->max); | |
459 | c->openmax = (a->openmax || b->openmax); | |
460 | c->integer = (a->integer && b->integer); | |
461 | } | |
462 | ||
463 | /** | |
464 | * snd_interval_div - refine the interval value with division | |
df8db936 TI |
465 | * @a: dividend |
466 | * @b: divisor | |
467 | * @c: quotient | |
1da177e4 LT |
468 | * |
469 | * c = a / b | |
470 | * | |
471 | * Returns non-zero if the value is changed, zero if not changed. | |
472 | */ | |
877211f5 | 473 | void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c) |
1da177e4 LT |
474 | { |
475 | unsigned int r; | |
476 | if (a->empty || b->empty) { | |
477 | snd_interval_none(c); | |
478 | return; | |
479 | } | |
480 | c->empty = 0; | |
481 | c->min = div32(a->min, b->max, &r); | |
482 | c->openmin = (r || a->openmin || b->openmax); | |
483 | if (b->min > 0) { | |
484 | c->max = div32(a->max, b->min, &r); | |
485 | if (r) { | |
486 | c->max++; | |
487 | c->openmax = 1; | |
488 | } else | |
489 | c->openmax = (a->openmax || b->openmin); | |
490 | } else { | |
491 | c->max = UINT_MAX; | |
492 | c->openmax = 0; | |
493 | } | |
494 | c->integer = 0; | |
495 | } | |
496 | ||
497 | /** | |
498 | * snd_interval_muldivk - refine the interval value | |
df8db936 TI |
499 | * @a: dividend 1 |
500 | * @b: dividend 2 | |
501 | * @k: divisor (as integer) | |
502 | * @c: result | |
503 | * | |
1da177e4 LT |
504 | * c = a * b / k |
505 | * | |
506 | * Returns non-zero if the value is changed, zero if not changed. | |
507 | */ | |
877211f5 TI |
508 | void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b, |
509 | unsigned int k, struct snd_interval *c) | |
1da177e4 LT |
510 | { |
511 | unsigned int r; | |
512 | if (a->empty || b->empty) { | |
513 | snd_interval_none(c); | |
514 | return; | |
515 | } | |
516 | c->empty = 0; | |
517 | c->min = muldiv32(a->min, b->min, k, &r); | |
518 | c->openmin = (r || a->openmin || b->openmin); | |
519 | c->max = muldiv32(a->max, b->max, k, &r); | |
520 | if (r) { | |
521 | c->max++; | |
522 | c->openmax = 1; | |
523 | } else | |
524 | c->openmax = (a->openmax || b->openmax); | |
525 | c->integer = 0; | |
526 | } | |
527 | ||
528 | /** | |
529 | * snd_interval_mulkdiv - refine the interval value | |
df8db936 TI |
530 | * @a: dividend 1 |
531 | * @k: dividend 2 (as integer) | |
532 | * @b: divisor | |
533 | * @c: result | |
1da177e4 LT |
534 | * |
535 | * c = a * k / b | |
536 | * | |
537 | * Returns non-zero if the value is changed, zero if not changed. | |
538 | */ | |
877211f5 TI |
539 | void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k, |
540 | const struct snd_interval *b, struct snd_interval *c) | |
1da177e4 LT |
541 | { |
542 | unsigned int r; | |
543 | if (a->empty || b->empty) { | |
544 | snd_interval_none(c); | |
545 | return; | |
546 | } | |
547 | c->empty = 0; | |
548 | c->min = muldiv32(a->min, k, b->max, &r); | |
549 | c->openmin = (r || a->openmin || b->openmax); | |
550 | if (b->min > 0) { | |
551 | c->max = muldiv32(a->max, k, b->min, &r); | |
552 | if (r) { | |
553 | c->max++; | |
554 | c->openmax = 1; | |
555 | } else | |
556 | c->openmax = (a->openmax || b->openmin); | |
557 | } else { | |
558 | c->max = UINT_MAX; | |
559 | c->openmax = 0; | |
560 | } | |
561 | c->integer = 0; | |
562 | } | |
563 | ||
1da177e4 LT |
564 | /* ---- */ |
565 | ||
566 | ||
567 | /** | |
568 | * snd_interval_ratnum - refine the interval value | |
df8db936 TI |
569 | * @i: interval to refine |
570 | * @rats_count: number of ratnum_t | |
571 | * @rats: ratnum_t array | |
572 | * @nump: pointer to store the resultant numerator | |
573 | * @denp: pointer to store the resultant denominator | |
1da177e4 LT |
574 | * |
575 | * Returns non-zero if the value is changed, zero if not changed. | |
576 | */ | |
877211f5 TI |
577 | int snd_interval_ratnum(struct snd_interval *i, |
578 | unsigned int rats_count, struct snd_ratnum *rats, | |
579 | unsigned int *nump, unsigned int *denp) | |
1da177e4 LT |
580 | { |
581 | unsigned int best_num, best_diff, best_den; | |
582 | unsigned int k; | |
877211f5 | 583 | struct snd_interval t; |
1da177e4 LT |
584 | int err; |
585 | ||
586 | best_num = best_den = best_diff = 0; | |
587 | for (k = 0; k < rats_count; ++k) { | |
588 | unsigned int num = rats[k].num; | |
589 | unsigned int den; | |
590 | unsigned int q = i->min; | |
591 | int diff; | |
592 | if (q == 0) | |
593 | q = 1; | |
594 | den = div_down(num, q); | |
595 | if (den < rats[k].den_min) | |
596 | continue; | |
597 | if (den > rats[k].den_max) | |
598 | den = rats[k].den_max; | |
599 | else { | |
600 | unsigned int r; | |
601 | r = (den - rats[k].den_min) % rats[k].den_step; | |
602 | if (r != 0) | |
603 | den -= r; | |
604 | } | |
605 | diff = num - q * den; | |
606 | if (best_num == 0 || | |
607 | diff * best_den < best_diff * den) { | |
608 | best_diff = diff; | |
609 | best_den = den; | |
610 | best_num = num; | |
611 | } | |
612 | } | |
613 | if (best_den == 0) { | |
614 | i->empty = 1; | |
615 | return -EINVAL; | |
616 | } | |
617 | t.min = div_down(best_num, best_den); | |
618 | t.openmin = !!(best_num % best_den); | |
619 | ||
620 | best_num = best_den = best_diff = 0; | |
621 | for (k = 0; k < rats_count; ++k) { | |
622 | unsigned int num = rats[k].num; | |
623 | unsigned int den; | |
624 | unsigned int q = i->max; | |
625 | int diff; | |
626 | if (q == 0) { | |
627 | i->empty = 1; | |
628 | return -EINVAL; | |
629 | } | |
630 | den = div_up(num, q); | |
631 | if (den > rats[k].den_max) | |
632 | continue; | |
633 | if (den < rats[k].den_min) | |
634 | den = rats[k].den_min; | |
635 | else { | |
636 | unsigned int r; | |
637 | r = (den - rats[k].den_min) % rats[k].den_step; | |
638 | if (r != 0) | |
639 | den += rats[k].den_step - r; | |
640 | } | |
641 | diff = q * den - num; | |
642 | if (best_num == 0 || | |
643 | diff * best_den < best_diff * den) { | |
644 | best_diff = diff; | |
645 | best_den = den; | |
646 | best_num = num; | |
647 | } | |
648 | } | |
649 | if (best_den == 0) { | |
650 | i->empty = 1; | |
651 | return -EINVAL; | |
652 | } | |
653 | t.max = div_up(best_num, best_den); | |
654 | t.openmax = !!(best_num % best_den); | |
655 | t.integer = 0; | |
656 | err = snd_interval_refine(i, &t); | |
657 | if (err < 0) | |
658 | return err; | |
659 | ||
660 | if (snd_interval_single(i)) { | |
661 | if (nump) | |
662 | *nump = best_num; | |
663 | if (denp) | |
664 | *denp = best_den; | |
665 | } | |
666 | return err; | |
667 | } | |
668 | ||
e88e8ae6 TI |
669 | EXPORT_SYMBOL(snd_interval_ratnum); |
670 | ||
1da177e4 LT |
671 | /** |
672 | * snd_interval_ratden - refine the interval value | |
df8db936 | 673 | * @i: interval to refine |
877211f5 TI |
674 | * @rats_count: number of struct ratden |
675 | * @rats: struct ratden array | |
df8db936 TI |
676 | * @nump: pointer to store the resultant numerator |
677 | * @denp: pointer to store the resultant denominator | |
1da177e4 LT |
678 | * |
679 | * Returns non-zero if the value is changed, zero if not changed. | |
680 | */ | |
877211f5 TI |
681 | static int snd_interval_ratden(struct snd_interval *i, |
682 | unsigned int rats_count, struct snd_ratden *rats, | |
1da177e4 LT |
683 | unsigned int *nump, unsigned int *denp) |
684 | { | |
685 | unsigned int best_num, best_diff, best_den; | |
686 | unsigned int k; | |
877211f5 | 687 | struct snd_interval t; |
1da177e4 LT |
688 | int err; |
689 | ||
690 | best_num = best_den = best_diff = 0; | |
691 | for (k = 0; k < rats_count; ++k) { | |
692 | unsigned int num; | |
693 | unsigned int den = rats[k].den; | |
694 | unsigned int q = i->min; | |
695 | int diff; | |
696 | num = mul(q, den); | |
697 | if (num > rats[k].num_max) | |
698 | continue; | |
699 | if (num < rats[k].num_min) | |
700 | num = rats[k].num_max; | |
701 | else { | |
702 | unsigned int r; | |
703 | r = (num - rats[k].num_min) % rats[k].num_step; | |
704 | if (r != 0) | |
705 | num += rats[k].num_step - r; | |
706 | } | |
707 | diff = num - q * den; | |
708 | if (best_num == 0 || | |
709 | diff * best_den < best_diff * den) { | |
710 | best_diff = diff; | |
711 | best_den = den; | |
712 | best_num = num; | |
713 | } | |
714 | } | |
715 | if (best_den == 0) { | |
716 | i->empty = 1; | |
717 | return -EINVAL; | |
718 | } | |
719 | t.min = div_down(best_num, best_den); | |
720 | t.openmin = !!(best_num % best_den); | |
721 | ||
722 | best_num = best_den = best_diff = 0; | |
723 | for (k = 0; k < rats_count; ++k) { | |
724 | unsigned int num; | |
725 | unsigned int den = rats[k].den; | |
726 | unsigned int q = i->max; | |
727 | int diff; | |
728 | num = mul(q, den); | |
729 | if (num < rats[k].num_min) | |
730 | continue; | |
731 | if (num > rats[k].num_max) | |
732 | num = rats[k].num_max; | |
733 | else { | |
734 | unsigned int r; | |
735 | r = (num - rats[k].num_min) % rats[k].num_step; | |
736 | if (r != 0) | |
737 | num -= r; | |
738 | } | |
739 | diff = q * den - num; | |
740 | if (best_num == 0 || | |
741 | diff * best_den < best_diff * den) { | |
742 | best_diff = diff; | |
743 | best_den = den; | |
744 | best_num = num; | |
745 | } | |
746 | } | |
747 | if (best_den == 0) { | |
748 | i->empty = 1; | |
749 | return -EINVAL; | |
750 | } | |
751 | t.max = div_up(best_num, best_den); | |
752 | t.openmax = !!(best_num % best_den); | |
753 | t.integer = 0; | |
754 | err = snd_interval_refine(i, &t); | |
755 | if (err < 0) | |
756 | return err; | |
757 | ||
758 | if (snd_interval_single(i)) { | |
759 | if (nump) | |
760 | *nump = best_num; | |
761 | if (denp) | |
762 | *denp = best_den; | |
763 | } | |
764 | return err; | |
765 | } | |
766 | ||
767 | /** | |
768 | * snd_interval_list - refine the interval value from the list | |
769 | * @i: the interval value to refine | |
770 | * @count: the number of elements in the list | |
771 | * @list: the value list | |
772 | * @mask: the bit-mask to evaluate | |
773 | * | |
774 | * Refines the interval value from the list. | |
775 | * When mask is non-zero, only the elements corresponding to bit 1 are | |
776 | * evaluated. | |
777 | * | |
778 | * Returns non-zero if the value is changed, zero if not changed. | |
779 | */ | |
877211f5 | 780 | int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask) |
1da177e4 LT |
781 | { |
782 | unsigned int k; | |
783 | int changed = 0; | |
0981a260 TI |
784 | |
785 | if (!count) { | |
786 | i->empty = 1; | |
787 | return -EINVAL; | |
788 | } | |
1da177e4 LT |
789 | for (k = 0; k < count; k++) { |
790 | if (mask && !(mask & (1 << k))) | |
791 | continue; | |
792 | if (i->min == list[k] && !i->openmin) | |
793 | goto _l1; | |
794 | if (i->min < list[k]) { | |
795 | i->min = list[k]; | |
796 | i->openmin = 0; | |
797 | changed = 1; | |
798 | goto _l1; | |
799 | } | |
800 | } | |
801 | i->empty = 1; | |
802 | return -EINVAL; | |
803 | _l1: | |
804 | for (k = count; k-- > 0;) { | |
805 | if (mask && !(mask & (1 << k))) | |
806 | continue; | |
807 | if (i->max == list[k] && !i->openmax) | |
808 | goto _l2; | |
809 | if (i->max > list[k]) { | |
810 | i->max = list[k]; | |
811 | i->openmax = 0; | |
812 | changed = 1; | |
813 | goto _l2; | |
814 | } | |
815 | } | |
816 | i->empty = 1; | |
817 | return -EINVAL; | |
818 | _l2: | |
819 | if (snd_interval_checkempty(i)) { | |
820 | i->empty = 1; | |
821 | return -EINVAL; | |
822 | } | |
823 | return changed; | |
824 | } | |
825 | ||
e88e8ae6 TI |
826 | EXPORT_SYMBOL(snd_interval_list); |
827 | ||
877211f5 | 828 | static int snd_interval_step(struct snd_interval *i, unsigned int min, unsigned int step) |
1da177e4 LT |
829 | { |
830 | unsigned int n; | |
831 | int changed = 0; | |
832 | n = (i->min - min) % step; | |
833 | if (n != 0 || i->openmin) { | |
834 | i->min += step - n; | |
835 | changed = 1; | |
836 | } | |
837 | n = (i->max - min) % step; | |
838 | if (n != 0 || i->openmax) { | |
839 | i->max -= n; | |
840 | changed = 1; | |
841 | } | |
842 | if (snd_interval_checkempty(i)) { | |
843 | i->empty = 1; | |
844 | return -EINVAL; | |
845 | } | |
846 | return changed; | |
847 | } | |
848 | ||
849 | /* Info constraints helpers */ | |
850 | ||
851 | /** | |
852 | * snd_pcm_hw_rule_add - add the hw-constraint rule | |
853 | * @runtime: the pcm runtime instance | |
854 | * @cond: condition bits | |
855 | * @var: the variable to evaluate | |
856 | * @func: the evaluation function | |
857 | * @private: the private data pointer passed to function | |
858 | * @dep: the dependent variables | |
859 | * | |
860 | * Returns zero if successful, or a negative error code on failure. | |
861 | */ | |
877211f5 | 862 | int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond, |
1da177e4 LT |
863 | int var, |
864 | snd_pcm_hw_rule_func_t func, void *private, | |
865 | int dep, ...) | |
866 | { | |
877211f5 TI |
867 | struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; |
868 | struct snd_pcm_hw_rule *c; | |
1da177e4 LT |
869 | unsigned int k; |
870 | va_list args; | |
871 | va_start(args, dep); | |
872 | if (constrs->rules_num >= constrs->rules_all) { | |
877211f5 | 873 | struct snd_pcm_hw_rule *new; |
1da177e4 LT |
874 | unsigned int new_rules = constrs->rules_all + 16; |
875 | new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL); | |
876 | if (!new) | |
877 | return -ENOMEM; | |
878 | if (constrs->rules) { | |
879 | memcpy(new, constrs->rules, | |
880 | constrs->rules_num * sizeof(*c)); | |
881 | kfree(constrs->rules); | |
882 | } | |
883 | constrs->rules = new; | |
884 | constrs->rules_all = new_rules; | |
885 | } | |
886 | c = &constrs->rules[constrs->rules_num]; | |
887 | c->cond = cond; | |
888 | c->func = func; | |
889 | c->var = var; | |
890 | c->private = private; | |
891 | k = 0; | |
892 | while (1) { | |
893 | snd_assert(k < ARRAY_SIZE(c->deps), return -EINVAL); | |
894 | c->deps[k++] = dep; | |
895 | if (dep < 0) | |
896 | break; | |
897 | dep = va_arg(args, int); | |
898 | } | |
899 | constrs->rules_num++; | |
900 | va_end(args); | |
901 | return 0; | |
902 | } | |
903 | ||
e88e8ae6 TI |
904 | EXPORT_SYMBOL(snd_pcm_hw_rule_add); |
905 | ||
1da177e4 LT |
906 | /** |
907 | * snd_pcm_hw_constraint_mask | |
df8db936 TI |
908 | * @runtime: PCM runtime instance |
909 | * @var: hw_params variable to apply the mask | |
910 | * @mask: the bitmap mask | |
911 | * | |
912 | * Apply the constraint of the given bitmap mask to a mask parameter. | |
1da177e4 | 913 | */ |
877211f5 | 914 | int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, |
1da177e4 LT |
915 | u_int32_t mask) |
916 | { | |
877211f5 TI |
917 | struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; |
918 | struct snd_mask *maskp = constrs_mask(constrs, var); | |
1da177e4 LT |
919 | *maskp->bits &= mask; |
920 | memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */ | |
921 | if (*maskp->bits == 0) | |
922 | return -EINVAL; | |
923 | return 0; | |
924 | } | |
925 | ||
926 | /** | |
927 | * snd_pcm_hw_constraint_mask64 | |
df8db936 TI |
928 | * @runtime: PCM runtime instance |
929 | * @var: hw_params variable to apply the mask | |
930 | * @mask: the 64bit bitmap mask | |
931 | * | |
932 | * Apply the constraint of the given bitmap mask to a mask parameter. | |
1da177e4 | 933 | */ |
877211f5 | 934 | int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, |
1da177e4 LT |
935 | u_int64_t mask) |
936 | { | |
877211f5 TI |
937 | struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; |
938 | struct snd_mask *maskp = constrs_mask(constrs, var); | |
1da177e4 LT |
939 | maskp->bits[0] &= (u_int32_t)mask; |
940 | maskp->bits[1] &= (u_int32_t)(mask >> 32); | |
941 | memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */ | |
942 | if (! maskp->bits[0] && ! maskp->bits[1]) | |
943 | return -EINVAL; | |
944 | return 0; | |
945 | } | |
946 | ||
947 | /** | |
948 | * snd_pcm_hw_constraint_integer | |
df8db936 TI |
949 | * @runtime: PCM runtime instance |
950 | * @var: hw_params variable to apply the integer constraint | |
951 | * | |
952 | * Apply the constraint of integer to an interval parameter. | |
1da177e4 | 953 | */ |
877211f5 | 954 | int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var) |
1da177e4 | 955 | { |
877211f5 | 956 | struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; |
1da177e4 LT |
957 | return snd_interval_setinteger(constrs_interval(constrs, var)); |
958 | } | |
959 | ||
e88e8ae6 TI |
960 | EXPORT_SYMBOL(snd_pcm_hw_constraint_integer); |
961 | ||
1da177e4 LT |
962 | /** |
963 | * snd_pcm_hw_constraint_minmax | |
df8db936 TI |
964 | * @runtime: PCM runtime instance |
965 | * @var: hw_params variable to apply the range | |
966 | * @min: the minimal value | |
967 | * @max: the maximal value | |
968 | * | |
969 | * Apply the min/max range constraint to an interval parameter. | |
1da177e4 | 970 | */ |
877211f5 | 971 | int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, |
1da177e4 LT |
972 | unsigned int min, unsigned int max) |
973 | { | |
877211f5 TI |
974 | struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; |
975 | struct snd_interval t; | |
1da177e4 LT |
976 | t.min = min; |
977 | t.max = max; | |
978 | t.openmin = t.openmax = 0; | |
979 | t.integer = 0; | |
980 | return snd_interval_refine(constrs_interval(constrs, var), &t); | |
981 | } | |
982 | ||
e88e8ae6 TI |
983 | EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax); |
984 | ||
877211f5 TI |
985 | static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params, |
986 | struct snd_pcm_hw_rule *rule) | |
1da177e4 | 987 | { |
877211f5 | 988 | struct snd_pcm_hw_constraint_list *list = rule->private; |
1da177e4 LT |
989 | return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask); |
990 | } | |
991 | ||
992 | ||
993 | /** | |
994 | * snd_pcm_hw_constraint_list | |
df8db936 TI |
995 | * @runtime: PCM runtime instance |
996 | * @cond: condition bits | |
997 | * @var: hw_params variable to apply the list constraint | |
998 | * @l: list | |
999 | * | |
1000 | * Apply the list of constraints to an interval parameter. | |
1da177e4 | 1001 | */ |
877211f5 | 1002 | int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime, |
1da177e4 LT |
1003 | unsigned int cond, |
1004 | snd_pcm_hw_param_t var, | |
877211f5 | 1005 | struct snd_pcm_hw_constraint_list *l) |
1da177e4 LT |
1006 | { |
1007 | return snd_pcm_hw_rule_add(runtime, cond, var, | |
1008 | snd_pcm_hw_rule_list, l, | |
1009 | var, -1); | |
1010 | } | |
1011 | ||
e88e8ae6 TI |
1012 | EXPORT_SYMBOL(snd_pcm_hw_constraint_list); |
1013 | ||
877211f5 TI |
1014 | static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params, |
1015 | struct snd_pcm_hw_rule *rule) | |
1da177e4 | 1016 | { |
877211f5 | 1017 | struct snd_pcm_hw_constraint_ratnums *r = rule->private; |
1da177e4 LT |
1018 | unsigned int num = 0, den = 0; |
1019 | int err; | |
1020 | err = snd_interval_ratnum(hw_param_interval(params, rule->var), | |
1021 | r->nrats, r->rats, &num, &den); | |
1022 | if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) { | |
1023 | params->rate_num = num; | |
1024 | params->rate_den = den; | |
1025 | } | |
1026 | return err; | |
1027 | } | |
1028 | ||
1029 | /** | |
1030 | * snd_pcm_hw_constraint_ratnums | |
df8db936 TI |
1031 | * @runtime: PCM runtime instance |
1032 | * @cond: condition bits | |
1033 | * @var: hw_params variable to apply the ratnums constraint | |
877211f5 | 1034 | * @r: struct snd_ratnums constriants |
1da177e4 | 1035 | */ |
877211f5 | 1036 | int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime, |
1da177e4 LT |
1037 | unsigned int cond, |
1038 | snd_pcm_hw_param_t var, | |
877211f5 | 1039 | struct snd_pcm_hw_constraint_ratnums *r) |
1da177e4 LT |
1040 | { |
1041 | return snd_pcm_hw_rule_add(runtime, cond, var, | |
1042 | snd_pcm_hw_rule_ratnums, r, | |
1043 | var, -1); | |
1044 | } | |
1045 | ||
e88e8ae6 TI |
1046 | EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums); |
1047 | ||
877211f5 TI |
1048 | static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params, |
1049 | struct snd_pcm_hw_rule *rule) | |
1da177e4 | 1050 | { |
877211f5 | 1051 | struct snd_pcm_hw_constraint_ratdens *r = rule->private; |
1da177e4 LT |
1052 | unsigned int num = 0, den = 0; |
1053 | int err = snd_interval_ratden(hw_param_interval(params, rule->var), | |
1054 | r->nrats, r->rats, &num, &den); | |
1055 | if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) { | |
1056 | params->rate_num = num; | |
1057 | params->rate_den = den; | |
1058 | } | |
1059 | return err; | |
1060 | } | |
1061 | ||
1062 | /** | |
1063 | * snd_pcm_hw_constraint_ratdens | |
df8db936 TI |
1064 | * @runtime: PCM runtime instance |
1065 | * @cond: condition bits | |
1066 | * @var: hw_params variable to apply the ratdens constraint | |
877211f5 | 1067 | * @r: struct snd_ratdens constriants |
1da177e4 | 1068 | */ |
877211f5 | 1069 | int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime, |
1da177e4 LT |
1070 | unsigned int cond, |
1071 | snd_pcm_hw_param_t var, | |
877211f5 | 1072 | struct snd_pcm_hw_constraint_ratdens *r) |
1da177e4 LT |
1073 | { |
1074 | return snd_pcm_hw_rule_add(runtime, cond, var, | |
1075 | snd_pcm_hw_rule_ratdens, r, | |
1076 | var, -1); | |
1077 | } | |
1078 | ||
e88e8ae6 TI |
1079 | EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens); |
1080 | ||
877211f5 TI |
1081 | static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params, |
1082 | struct snd_pcm_hw_rule *rule) | |
1da177e4 LT |
1083 | { |
1084 | unsigned int l = (unsigned long) rule->private; | |
1085 | int width = l & 0xffff; | |
1086 | unsigned int msbits = l >> 16; | |
877211f5 | 1087 | struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); |
1da177e4 LT |
1088 | if (snd_interval_single(i) && snd_interval_value(i) == width) |
1089 | params->msbits = msbits; | |
1090 | return 0; | |
1091 | } | |
1092 | ||
1093 | /** | |
1094 | * snd_pcm_hw_constraint_msbits | |
df8db936 TI |
1095 | * @runtime: PCM runtime instance |
1096 | * @cond: condition bits | |
1097 | * @width: sample bits width | |
1098 | * @msbits: msbits width | |
1da177e4 | 1099 | */ |
877211f5 | 1100 | int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime, |
1da177e4 LT |
1101 | unsigned int cond, |
1102 | unsigned int width, | |
1103 | unsigned int msbits) | |
1104 | { | |
1105 | unsigned long l = (msbits << 16) | width; | |
1106 | return snd_pcm_hw_rule_add(runtime, cond, -1, | |
1107 | snd_pcm_hw_rule_msbits, | |
1108 | (void*) l, | |
1109 | SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); | |
1110 | } | |
1111 | ||
e88e8ae6 TI |
1112 | EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits); |
1113 | ||
877211f5 TI |
1114 | static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params, |
1115 | struct snd_pcm_hw_rule *rule) | |
1da177e4 LT |
1116 | { |
1117 | unsigned long step = (unsigned long) rule->private; | |
1118 | return snd_interval_step(hw_param_interval(params, rule->var), 0, step); | |
1119 | } | |
1120 | ||
1121 | /** | |
1122 | * snd_pcm_hw_constraint_step | |
df8db936 TI |
1123 | * @runtime: PCM runtime instance |
1124 | * @cond: condition bits | |
1125 | * @var: hw_params variable to apply the step constraint | |
1126 | * @step: step size | |
1da177e4 | 1127 | */ |
877211f5 | 1128 | int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime, |
1da177e4 LT |
1129 | unsigned int cond, |
1130 | snd_pcm_hw_param_t var, | |
1131 | unsigned long step) | |
1132 | { | |
1133 | return snd_pcm_hw_rule_add(runtime, cond, var, | |
1134 | snd_pcm_hw_rule_step, (void *) step, | |
1135 | var, -1); | |
1136 | } | |
1137 | ||
e88e8ae6 TI |
1138 | EXPORT_SYMBOL(snd_pcm_hw_constraint_step); |
1139 | ||
877211f5 | 1140 | static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule) |
1da177e4 LT |
1141 | { |
1142 | static int pow2_sizes[] = { | |
1143 | 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7, | |
1144 | 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15, | |
1145 | 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23, | |
1146 | 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30 | |
1147 | }; | |
1148 | return snd_interval_list(hw_param_interval(params, rule->var), | |
1149 | ARRAY_SIZE(pow2_sizes), pow2_sizes, 0); | |
1150 | } | |
1151 | ||
1152 | /** | |
1153 | * snd_pcm_hw_constraint_pow2 | |
df8db936 TI |
1154 | * @runtime: PCM runtime instance |
1155 | * @cond: condition bits | |
1156 | * @var: hw_params variable to apply the power-of-2 constraint | |
1da177e4 | 1157 | */ |
877211f5 | 1158 | int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime, |
1da177e4 LT |
1159 | unsigned int cond, |
1160 | snd_pcm_hw_param_t var) | |
1161 | { | |
1162 | return snd_pcm_hw_rule_add(runtime, cond, var, | |
1163 | snd_pcm_hw_rule_pow2, NULL, | |
1164 | var, -1); | |
1165 | } | |
1166 | ||
e88e8ae6 TI |
1167 | EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2); |
1168 | ||
877211f5 | 1169 | static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params, |
123992f7 | 1170 | snd_pcm_hw_param_t var) |
1da177e4 LT |
1171 | { |
1172 | if (hw_is_mask(var)) { | |
1173 | snd_mask_any(hw_param_mask(params, var)); | |
1174 | params->cmask |= 1 << var; | |
1175 | params->rmask |= 1 << var; | |
1176 | return; | |
1177 | } | |
1178 | if (hw_is_interval(var)) { | |
1179 | snd_interval_any(hw_param_interval(params, var)); | |
1180 | params->cmask |= 1 << var; | |
1181 | params->rmask |= 1 << var; | |
1182 | return; | |
1183 | } | |
1184 | snd_BUG(); | |
1185 | } | |
1186 | ||
877211f5 | 1187 | void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params) |
1da177e4 LT |
1188 | { |
1189 | unsigned int k; | |
1190 | memset(params, 0, sizeof(*params)); | |
1191 | for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) | |
1192 | _snd_pcm_hw_param_any(params, k); | |
1193 | for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) | |
1194 | _snd_pcm_hw_param_any(params, k); | |
1195 | params->info = ~0U; | |
1196 | } | |
1197 | ||
e88e8ae6 | 1198 | EXPORT_SYMBOL(_snd_pcm_hw_params_any); |
1da177e4 LT |
1199 | |
1200 | /** | |
1201 | * snd_pcm_hw_param_value | |
df8db936 TI |
1202 | * @params: the hw_params instance |
1203 | * @var: parameter to retrieve | |
1204 | * @dir: pointer to the direction (-1,0,1) or NULL | |
1da177e4 LT |
1205 | * |
1206 | * Return the value for field PAR if it's fixed in configuration space | |
1207 | * defined by PARAMS. Return -EINVAL otherwise | |
1208 | */ | |
e88e8ae6 TI |
1209 | int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params, |
1210 | snd_pcm_hw_param_t var, int *dir) | |
1da177e4 LT |
1211 | { |
1212 | if (hw_is_mask(var)) { | |
877211f5 | 1213 | const struct snd_mask *mask = hw_param_mask_c(params, var); |
1da177e4 LT |
1214 | if (!snd_mask_single(mask)) |
1215 | return -EINVAL; | |
1216 | if (dir) | |
1217 | *dir = 0; | |
1218 | return snd_mask_value(mask); | |
1219 | } | |
1220 | if (hw_is_interval(var)) { | |
877211f5 | 1221 | const struct snd_interval *i = hw_param_interval_c(params, var); |
1da177e4 LT |
1222 | if (!snd_interval_single(i)) |
1223 | return -EINVAL; | |
1224 | if (dir) | |
1225 | *dir = i->openmin; | |
1226 | return snd_interval_value(i); | |
1227 | } | |
1da177e4 LT |
1228 | return -EINVAL; |
1229 | } | |
1230 | ||
e88e8ae6 | 1231 | EXPORT_SYMBOL(snd_pcm_hw_param_value); |
1da177e4 | 1232 | |
877211f5 | 1233 | void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, |
1da177e4 LT |
1234 | snd_pcm_hw_param_t var) |
1235 | { | |
1236 | if (hw_is_mask(var)) { | |
1237 | snd_mask_none(hw_param_mask(params, var)); | |
1238 | params->cmask |= 1 << var; | |
1239 | params->rmask |= 1 << var; | |
1240 | } else if (hw_is_interval(var)) { | |
1241 | snd_interval_none(hw_param_interval(params, var)); | |
1242 | params->cmask |= 1 << var; | |
1243 | params->rmask |= 1 << var; | |
1244 | } else { | |
1245 | snd_BUG(); | |
1246 | } | |
1247 | } | |
1248 | ||
e88e8ae6 | 1249 | EXPORT_SYMBOL(_snd_pcm_hw_param_setempty); |
1da177e4 | 1250 | |
877211f5 | 1251 | static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params, |
123992f7 | 1252 | snd_pcm_hw_param_t var) |
1da177e4 LT |
1253 | { |
1254 | int changed; | |
1255 | if (hw_is_mask(var)) | |
1256 | changed = snd_mask_refine_first(hw_param_mask(params, var)); | |
1257 | else if (hw_is_interval(var)) | |
1258 | changed = snd_interval_refine_first(hw_param_interval(params, var)); | |
2f4ca8e5 | 1259 | else |
1da177e4 | 1260 | return -EINVAL; |
1da177e4 LT |
1261 | if (changed) { |
1262 | params->cmask |= 1 << var; | |
1263 | params->rmask |= 1 << var; | |
1264 | } | |
1265 | return changed; | |
1266 | } | |
1267 | ||
1268 | ||
1269 | /** | |
1270 | * snd_pcm_hw_param_first | |
df8db936 TI |
1271 | * @pcm: PCM instance |
1272 | * @params: the hw_params instance | |
1273 | * @var: parameter to retrieve | |
1274 | * @dir: pointer to the direction (-1,0,1) or NULL | |
1da177e4 LT |
1275 | * |
1276 | * Inside configuration space defined by PARAMS remove from PAR all | |
1277 | * values > minimum. Reduce configuration space accordingly. | |
1278 | * Return the minimum. | |
1279 | */ | |
e88e8ae6 TI |
1280 | int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm, |
1281 | struct snd_pcm_hw_params *params, | |
1282 | snd_pcm_hw_param_t var, int *dir) | |
1da177e4 LT |
1283 | { |
1284 | int changed = _snd_pcm_hw_param_first(params, var); | |
1285 | if (changed < 0) | |
1286 | return changed; | |
1287 | if (params->rmask) { | |
1288 | int err = snd_pcm_hw_refine(pcm, params); | |
2f4ca8e5 | 1289 | snd_assert(err >= 0, return err); |
1da177e4 LT |
1290 | } |
1291 | return snd_pcm_hw_param_value(params, var, dir); | |
1292 | } | |
1293 | ||
e88e8ae6 TI |
1294 | EXPORT_SYMBOL(snd_pcm_hw_param_first); |
1295 | ||
877211f5 | 1296 | static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params, |
123992f7 | 1297 | snd_pcm_hw_param_t var) |
1da177e4 LT |
1298 | { |
1299 | int changed; | |
1300 | if (hw_is_mask(var)) | |
1301 | changed = snd_mask_refine_last(hw_param_mask(params, var)); | |
1302 | else if (hw_is_interval(var)) | |
1303 | changed = snd_interval_refine_last(hw_param_interval(params, var)); | |
2f4ca8e5 | 1304 | else |
1da177e4 | 1305 | return -EINVAL; |
1da177e4 LT |
1306 | if (changed) { |
1307 | params->cmask |= 1 << var; | |
1308 | params->rmask |= 1 << var; | |
1309 | } | |
1310 | return changed; | |
1311 | } | |
1312 | ||
1313 | ||
1314 | /** | |
1315 | * snd_pcm_hw_param_last | |
df8db936 TI |
1316 | * @pcm: PCM instance |
1317 | * @params: the hw_params instance | |
1318 | * @var: parameter to retrieve | |
1319 | * @dir: pointer to the direction (-1,0,1) or NULL | |
1da177e4 LT |
1320 | * |
1321 | * Inside configuration space defined by PARAMS remove from PAR all | |
1322 | * values < maximum. Reduce configuration space accordingly. | |
1323 | * Return the maximum. | |
1324 | */ | |
e88e8ae6 TI |
1325 | int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm, |
1326 | struct snd_pcm_hw_params *params, | |
1327 | snd_pcm_hw_param_t var, int *dir) | |
1da177e4 LT |
1328 | { |
1329 | int changed = _snd_pcm_hw_param_last(params, var); | |
1330 | if (changed < 0) | |
1331 | return changed; | |
1332 | if (params->rmask) { | |
1333 | int err = snd_pcm_hw_refine(pcm, params); | |
2f4ca8e5 | 1334 | snd_assert(err >= 0, return err); |
1da177e4 LT |
1335 | } |
1336 | return snd_pcm_hw_param_value(params, var, dir); | |
1337 | } | |
1338 | ||
e88e8ae6 | 1339 | EXPORT_SYMBOL(snd_pcm_hw_param_last); |
1da177e4 LT |
1340 | |
1341 | /** | |
1342 | * snd_pcm_hw_param_choose | |
df8db936 TI |
1343 | * @pcm: PCM instance |
1344 | * @params: the hw_params instance | |
1da177e4 LT |
1345 | * |
1346 | * Choose one configuration from configuration space defined by PARAMS | |
1347 | * The configuration chosen is that obtained fixing in this order: | |
1348 | * first access, first format, first subformat, min channels, | |
1349 | * min rate, min period time, max buffer size, min tick time | |
1350 | */ | |
2f4ca8e5 TI |
1351 | int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm, |
1352 | struct snd_pcm_hw_params *params) | |
1da177e4 | 1353 | { |
2f4ca8e5 TI |
1354 | static int vars[] = { |
1355 | SNDRV_PCM_HW_PARAM_ACCESS, | |
1356 | SNDRV_PCM_HW_PARAM_FORMAT, | |
1357 | SNDRV_PCM_HW_PARAM_SUBFORMAT, | |
1358 | SNDRV_PCM_HW_PARAM_CHANNELS, | |
1359 | SNDRV_PCM_HW_PARAM_RATE, | |
1360 | SNDRV_PCM_HW_PARAM_PERIOD_TIME, | |
1361 | SNDRV_PCM_HW_PARAM_BUFFER_SIZE, | |
1362 | SNDRV_PCM_HW_PARAM_TICK_TIME, | |
1363 | -1 | |
1364 | }; | |
1365 | int err, *v; | |
1da177e4 | 1366 | |
2f4ca8e5 TI |
1367 | for (v = vars; *v != -1; v++) { |
1368 | if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE) | |
1369 | err = snd_pcm_hw_param_first(pcm, params, *v, NULL); | |
1370 | else | |
1371 | err = snd_pcm_hw_param_last(pcm, params, *v, NULL); | |
1372 | snd_assert(err >= 0, return err); | |
1373 | } | |
1da177e4 LT |
1374 | return 0; |
1375 | } | |
1376 | ||
877211f5 | 1377 | static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream, |
1da177e4 LT |
1378 | void *arg) |
1379 | { | |
877211f5 | 1380 | struct snd_pcm_runtime *runtime = substream->runtime; |
1da177e4 LT |
1381 | unsigned long flags; |
1382 | snd_pcm_stream_lock_irqsave(substream, flags); | |
1383 | if (snd_pcm_running(substream) && | |
1384 | snd_pcm_update_hw_ptr(substream) >= 0) | |
1385 | runtime->status->hw_ptr %= runtime->buffer_size; | |
1386 | else | |
1387 | runtime->status->hw_ptr = 0; | |
1388 | snd_pcm_stream_unlock_irqrestore(substream, flags); | |
1389 | return 0; | |
1390 | } | |
1391 | ||
877211f5 | 1392 | static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream, |
1da177e4 LT |
1393 | void *arg) |
1394 | { | |
877211f5 TI |
1395 | struct snd_pcm_channel_info *info = arg; |
1396 | struct snd_pcm_runtime *runtime = substream->runtime; | |
1da177e4 LT |
1397 | int width; |
1398 | if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) { | |
1399 | info->offset = -1; | |
1400 | return 0; | |
1401 | } | |
1402 | width = snd_pcm_format_physical_width(runtime->format); | |
1403 | if (width < 0) | |
1404 | return width; | |
1405 | info->offset = 0; | |
1406 | switch (runtime->access) { | |
1407 | case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED: | |
1408 | case SNDRV_PCM_ACCESS_RW_INTERLEAVED: | |
1409 | info->first = info->channel * width; | |
1410 | info->step = runtime->channels * width; | |
1411 | break; | |
1412 | case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED: | |
1413 | case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED: | |
1414 | { | |
1415 | size_t size = runtime->dma_bytes / runtime->channels; | |
1416 | info->first = info->channel * size * 8; | |
1417 | info->step = width; | |
1418 | break; | |
1419 | } | |
1420 | default: | |
1421 | snd_BUG(); | |
1422 | break; | |
1423 | } | |
1424 | return 0; | |
1425 | } | |
1426 | ||
1427 | /** | |
1428 | * snd_pcm_lib_ioctl - a generic PCM ioctl callback | |
1429 | * @substream: the pcm substream instance | |
1430 | * @cmd: ioctl command | |
1431 | * @arg: ioctl argument | |
1432 | * | |
1433 | * Processes the generic ioctl commands for PCM. | |
1434 | * Can be passed as the ioctl callback for PCM ops. | |
1435 | * | |
1436 | * Returns zero if successful, or a negative error code on failure. | |
1437 | */ | |
877211f5 | 1438 | int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream, |
1da177e4 LT |
1439 | unsigned int cmd, void *arg) |
1440 | { | |
1441 | switch (cmd) { | |
1442 | case SNDRV_PCM_IOCTL1_INFO: | |
1443 | return 0; | |
1444 | case SNDRV_PCM_IOCTL1_RESET: | |
1445 | return snd_pcm_lib_ioctl_reset(substream, arg); | |
1446 | case SNDRV_PCM_IOCTL1_CHANNEL_INFO: | |
1447 | return snd_pcm_lib_ioctl_channel_info(substream, arg); | |
1448 | } | |
1449 | return -ENXIO; | |
1450 | } | |
1451 | ||
e88e8ae6 TI |
1452 | EXPORT_SYMBOL(snd_pcm_lib_ioctl); |
1453 | ||
1da177e4 LT |
1454 | /* |
1455 | * Conditions | |
1456 | */ | |
1457 | ||
877211f5 | 1458 | static void snd_pcm_system_tick_set(struct snd_pcm_substream *substream, |
1da177e4 LT |
1459 | unsigned long ticks) |
1460 | { | |
877211f5 | 1461 | struct snd_pcm_runtime *runtime = substream->runtime; |
1da177e4 LT |
1462 | if (ticks == 0) |
1463 | del_timer(&runtime->tick_timer); | |
1464 | else { | |
1465 | ticks += (1000000 / HZ) - 1; | |
1466 | ticks /= (1000000 / HZ); | |
1467 | mod_timer(&runtime->tick_timer, jiffies + ticks); | |
1468 | } | |
1469 | } | |
1470 | ||
1471 | /* Temporary alias */ | |
877211f5 | 1472 | void snd_pcm_tick_set(struct snd_pcm_substream *substream, unsigned long ticks) |
1da177e4 LT |
1473 | { |
1474 | snd_pcm_system_tick_set(substream, ticks); | |
1475 | } | |
1476 | ||
877211f5 | 1477 | void snd_pcm_tick_prepare(struct snd_pcm_substream *substream) |
1da177e4 | 1478 | { |
877211f5 | 1479 | struct snd_pcm_runtime *runtime = substream->runtime; |
1da177e4 LT |
1480 | snd_pcm_uframes_t frames = ULONG_MAX; |
1481 | snd_pcm_uframes_t avail, dist; | |
1482 | unsigned int ticks; | |
1483 | u_int64_t n; | |
1484 | u_int32_t r; | |
1485 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
1486 | if (runtime->silence_size >= runtime->boundary) { | |
1487 | frames = 1; | |
1488 | } else if (runtime->silence_size > 0 && | |
1489 | runtime->silence_filled < runtime->buffer_size) { | |
1490 | snd_pcm_sframes_t noise_dist; | |
1491 | noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled; | |
235475cb TI |
1492 | if (noise_dist > (snd_pcm_sframes_t)runtime->silence_threshold) |
1493 | frames = noise_dist - runtime->silence_threshold; | |
1da177e4 LT |
1494 | } |
1495 | avail = snd_pcm_playback_avail(runtime); | |
1496 | } else { | |
1497 | avail = snd_pcm_capture_avail(runtime); | |
1498 | } | |
1499 | if (avail < runtime->control->avail_min) { | |
1500 | snd_pcm_sframes_t n = runtime->control->avail_min - avail; | |
1501 | if (n > 0 && frames > (snd_pcm_uframes_t)n) | |
1502 | frames = n; | |
1503 | } | |
1504 | if (avail < runtime->buffer_size) { | |
1505 | snd_pcm_sframes_t n = runtime->buffer_size - avail; | |
1506 | if (n > 0 && frames > (snd_pcm_uframes_t)n) | |
1507 | frames = n; | |
1508 | } | |
1509 | if (frames == ULONG_MAX) { | |
1510 | snd_pcm_tick_set(substream, 0); | |
1511 | return; | |
1512 | } | |
1513 | dist = runtime->status->hw_ptr - runtime->hw_ptr_base; | |
1514 | /* Distance to next interrupt */ | |
1515 | dist = runtime->period_size - dist % runtime->period_size; | |
1516 | if (dist <= frames) { | |
1517 | snd_pcm_tick_set(substream, 0); | |
1518 | return; | |
1519 | } | |
1520 | /* the base time is us */ | |
1521 | n = frames; | |
1522 | n *= 1000000; | |
1523 | div64_32(&n, runtime->tick_time * runtime->rate, &r); | |
1524 | ticks = n + (r > 0 ? 1 : 0); | |
1525 | if (ticks < runtime->sleep_min) | |
1526 | ticks = runtime->sleep_min; | |
1527 | snd_pcm_tick_set(substream, (unsigned long) ticks); | |
1528 | } | |
1529 | ||
877211f5 | 1530 | void snd_pcm_tick_elapsed(struct snd_pcm_substream *substream) |
1da177e4 | 1531 | { |
877211f5 | 1532 | struct snd_pcm_runtime *runtime; |
1da177e4 LT |
1533 | unsigned long flags; |
1534 | ||
1535 | snd_assert(substream != NULL, return); | |
1536 | runtime = substream->runtime; | |
1537 | snd_assert(runtime != NULL, return); | |
1538 | ||
1539 | snd_pcm_stream_lock_irqsave(substream, flags); | |
1540 | if (!snd_pcm_running(substream) || | |
1541 | snd_pcm_update_hw_ptr(substream) < 0) | |
1542 | goto _end; | |
1543 | if (runtime->sleep_min) | |
1544 | snd_pcm_tick_prepare(substream); | |
1545 | _end: | |
1546 | snd_pcm_stream_unlock_irqrestore(substream, flags); | |
1547 | } | |
1548 | ||
1549 | /** | |
1550 | * snd_pcm_period_elapsed - update the pcm status for the next period | |
1551 | * @substream: the pcm substream instance | |
1552 | * | |
1553 | * This function is called from the interrupt handler when the | |
1554 | * PCM has processed the period size. It will update the current | |
1555 | * pointer, set up the tick, wake up sleepers, etc. | |
1556 | * | |
1557 | * Even if more than one periods have elapsed since the last call, you | |
1558 | * have to call this only once. | |
1559 | */ | |
877211f5 | 1560 | void snd_pcm_period_elapsed(struct snd_pcm_substream *substream) |
1da177e4 | 1561 | { |
877211f5 | 1562 | struct snd_pcm_runtime *runtime; |
1da177e4 LT |
1563 | unsigned long flags; |
1564 | ||
1565 | snd_assert(substream != NULL, return); | |
1566 | runtime = substream->runtime; | |
1567 | snd_assert(runtime != NULL, return); | |
1568 | ||
1569 | if (runtime->transfer_ack_begin) | |
1570 | runtime->transfer_ack_begin(substream); | |
1571 | ||
1572 | snd_pcm_stream_lock_irqsave(substream, flags); | |
1573 | if (!snd_pcm_running(substream) || | |
1574 | snd_pcm_update_hw_ptr_interrupt(substream) < 0) | |
1575 | goto _end; | |
1576 | ||
1577 | if (substream->timer_running) | |
1578 | snd_timer_interrupt(substream->timer, 1); | |
1579 | if (runtime->sleep_min) | |
1580 | snd_pcm_tick_prepare(substream); | |
1581 | _end: | |
1582 | snd_pcm_stream_unlock_irqrestore(substream, flags); | |
1583 | if (runtime->transfer_ack_end) | |
1584 | runtime->transfer_ack_end(substream); | |
1585 | kill_fasync(&runtime->fasync, SIGIO, POLL_IN); | |
1586 | } | |
1587 | ||
e88e8ae6 TI |
1588 | EXPORT_SYMBOL(snd_pcm_period_elapsed); |
1589 | ||
877211f5 | 1590 | static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream, |
1da177e4 LT |
1591 | unsigned int hwoff, |
1592 | unsigned long data, unsigned int off, | |
1593 | snd_pcm_uframes_t frames) | |
1594 | { | |
877211f5 | 1595 | struct snd_pcm_runtime *runtime = substream->runtime; |
1da177e4 LT |
1596 | int err; |
1597 | char __user *buf = (char __user *) data + frames_to_bytes(runtime, off); | |
1598 | if (substream->ops->copy) { | |
1599 | if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0) | |
1600 | return err; | |
1601 | } else { | |
1602 | char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff); | |
1603 | snd_assert(runtime->dma_area, return -EFAULT); | |
1604 | if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames))) | |
1605 | return -EFAULT; | |
1606 | } | |
1607 | return 0; | |
1608 | } | |
1609 | ||
877211f5 | 1610 | typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff, |
1da177e4 LT |
1611 | unsigned long data, unsigned int off, |
1612 | snd_pcm_uframes_t size); | |
1613 | ||
877211f5 | 1614 | static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream, |
1da177e4 LT |
1615 | unsigned long data, |
1616 | snd_pcm_uframes_t size, | |
1617 | int nonblock, | |
1618 | transfer_f transfer) | |
1619 | { | |
877211f5 | 1620 | struct snd_pcm_runtime *runtime = substream->runtime; |
1da177e4 LT |
1621 | snd_pcm_uframes_t xfer = 0; |
1622 | snd_pcm_uframes_t offset = 0; | |
1623 | int err = 0; | |
1624 | ||
1625 | if (size == 0) | |
1626 | return 0; | |
1627 | if (size > runtime->xfer_align) | |
1628 | size -= size % runtime->xfer_align; | |
1629 | ||
1630 | snd_pcm_stream_lock_irq(substream); | |
1631 | switch (runtime->status->state) { | |
1632 | case SNDRV_PCM_STATE_PREPARED: | |
1633 | case SNDRV_PCM_STATE_RUNNING: | |
1634 | case SNDRV_PCM_STATE_PAUSED: | |
1635 | break; | |
1636 | case SNDRV_PCM_STATE_XRUN: | |
1637 | err = -EPIPE; | |
1638 | goto _end_unlock; | |
1639 | case SNDRV_PCM_STATE_SUSPENDED: | |
1640 | err = -ESTRPIPE; | |
1641 | goto _end_unlock; | |
1642 | default: | |
1643 | err = -EBADFD; | |
1644 | goto _end_unlock; | |
1645 | } | |
1646 | ||
1647 | while (size > 0) { | |
1648 | snd_pcm_uframes_t frames, appl_ptr, appl_ofs; | |
1649 | snd_pcm_uframes_t avail; | |
1650 | snd_pcm_uframes_t cont; | |
1651 | if (runtime->sleep_min == 0 && runtime->status->state == SNDRV_PCM_STATE_RUNNING) | |
1652 | snd_pcm_update_hw_ptr(substream); | |
1653 | avail = snd_pcm_playback_avail(runtime); | |
1654 | if (((avail < runtime->control->avail_min && size > avail) || | |
1655 | (size >= runtime->xfer_align && avail < runtime->xfer_align))) { | |
1656 | wait_queue_t wait; | |
443feb88 | 1657 | enum { READY, SIGNALED, ERROR, SUSPENDED, EXPIRED, DROPPED } state; |
1da177e4 LT |
1658 | long tout; |
1659 | ||
1660 | if (nonblock) { | |
1661 | err = -EAGAIN; | |
1662 | goto _end_unlock; | |
1663 | } | |
1664 | ||
1665 | init_waitqueue_entry(&wait, current); | |
1666 | add_wait_queue(&runtime->sleep, &wait); | |
1667 | while (1) { | |
1668 | if (signal_pending(current)) { | |
1669 | state = SIGNALED; | |
1670 | break; | |
1671 | } | |
1672 | set_current_state(TASK_INTERRUPTIBLE); | |
1673 | snd_pcm_stream_unlock_irq(substream); | |
1674 | tout = schedule_timeout(10 * HZ); | |
1675 | snd_pcm_stream_lock_irq(substream); | |
1676 | if (tout == 0) { | |
1677 | if (runtime->status->state != SNDRV_PCM_STATE_PREPARED && | |
1678 | runtime->status->state != SNDRV_PCM_STATE_PAUSED) { | |
1679 | state = runtime->status->state == SNDRV_PCM_STATE_SUSPENDED ? SUSPENDED : EXPIRED; | |
1680 | break; | |
1681 | } | |
1682 | } | |
1683 | switch (runtime->status->state) { | |
1684 | case SNDRV_PCM_STATE_XRUN: | |
1685 | case SNDRV_PCM_STATE_DRAINING: | |
1686 | state = ERROR; | |
1687 | goto _end_loop; | |
1688 | case SNDRV_PCM_STATE_SUSPENDED: | |
1689 | state = SUSPENDED; | |
1690 | goto _end_loop; | |
443feb88 KW |
1691 | case SNDRV_PCM_STATE_SETUP: |
1692 | state = DROPPED; | |
1693 | goto _end_loop; | |
1da177e4 LT |
1694 | default: |
1695 | break; | |
1696 | } | |
1697 | avail = snd_pcm_playback_avail(runtime); | |
1698 | if (avail >= runtime->control->avail_min) { | |
1699 | state = READY; | |
1700 | break; | |
1701 | } | |
1702 | } | |
1703 | _end_loop: | |
1704 | remove_wait_queue(&runtime->sleep, &wait); | |
1705 | ||
1706 | switch (state) { | |
1707 | case ERROR: | |
1708 | err = -EPIPE; | |
1709 | goto _end_unlock; | |
1710 | case SUSPENDED: | |
1711 | err = -ESTRPIPE; | |
1712 | goto _end_unlock; | |
1713 | case SIGNALED: | |
1714 | err = -ERESTARTSYS; | |
1715 | goto _end_unlock; | |
1716 | case EXPIRED: | |
1717 | snd_printd("playback write error (DMA or IRQ trouble?)\n"); | |
1718 | err = -EIO; | |
1719 | goto _end_unlock; | |
443feb88 KW |
1720 | case DROPPED: |
1721 | err = -EBADFD; | |
1722 | goto _end_unlock; | |
1da177e4 LT |
1723 | default: |
1724 | break; | |
1725 | } | |
1726 | } | |
1727 | if (avail > runtime->xfer_align) | |
1728 | avail -= avail % runtime->xfer_align; | |
1729 | frames = size > avail ? avail : size; | |
1730 | cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size; | |
1731 | if (frames > cont) | |
1732 | frames = cont; | |
1733 | snd_assert(frames != 0, snd_pcm_stream_unlock_irq(substream); return -EINVAL); | |
1734 | appl_ptr = runtime->control->appl_ptr; | |
1735 | appl_ofs = appl_ptr % runtime->buffer_size; | |
1736 | snd_pcm_stream_unlock_irq(substream); | |
1737 | if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0) | |
1738 | goto _end; | |
1739 | snd_pcm_stream_lock_irq(substream); | |
1740 | switch (runtime->status->state) { | |
1741 | case SNDRV_PCM_STATE_XRUN: | |
1742 | err = -EPIPE; | |
1743 | goto _end_unlock; | |
1744 | case SNDRV_PCM_STATE_SUSPENDED: | |
1745 | err = -ESTRPIPE; | |
1746 | goto _end_unlock; | |
1747 | default: | |
1748 | break; | |
1749 | } | |
1750 | appl_ptr += frames; | |
1751 | if (appl_ptr >= runtime->boundary) | |
1752 | appl_ptr -= runtime->boundary; | |
1753 | runtime->control->appl_ptr = appl_ptr; | |
1754 | if (substream->ops->ack) | |
1755 | substream->ops->ack(substream); | |
1756 | ||
1757 | offset += frames; | |
1758 | size -= frames; | |
1759 | xfer += frames; | |
1760 | if (runtime->status->state == SNDRV_PCM_STATE_PREPARED && | |
1761 | snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) { | |
1762 | err = snd_pcm_start(substream); | |
1763 | if (err < 0) | |
1764 | goto _end_unlock; | |
1765 | } | |
1766 | if (runtime->sleep_min && | |
1767 | runtime->status->state == SNDRV_PCM_STATE_RUNNING) | |
1768 | snd_pcm_tick_prepare(substream); | |
1769 | } | |
1770 | _end_unlock: | |
1771 | snd_pcm_stream_unlock_irq(substream); | |
1772 | _end: | |
1773 | return xfer > 0 ? (snd_pcm_sframes_t)xfer : err; | |
1774 | } | |
1775 | ||
877211f5 | 1776 | snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, const void __user *buf, snd_pcm_uframes_t size) |
1da177e4 | 1777 | { |
877211f5 | 1778 | struct snd_pcm_runtime *runtime; |
1da177e4 LT |
1779 | int nonblock; |
1780 | ||
1781 | snd_assert(substream != NULL, return -ENXIO); | |
1782 | runtime = substream->runtime; | |
1783 | snd_assert(runtime != NULL, return -ENXIO); | |
1784 | snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL); | |
1785 | if (runtime->status->state == SNDRV_PCM_STATE_OPEN) | |
1786 | return -EBADFD; | |
1787 | ||
0df63e44 | 1788 | nonblock = !!(substream->f_flags & O_NONBLOCK); |
1da177e4 LT |
1789 | |
1790 | if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED && | |
1791 | runtime->channels > 1) | |
1792 | return -EINVAL; | |
1793 | return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock, | |
1794 | snd_pcm_lib_write_transfer); | |
1795 | } | |
1796 | ||
e88e8ae6 TI |
1797 | EXPORT_SYMBOL(snd_pcm_lib_write); |
1798 | ||
877211f5 | 1799 | static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream, |
1da177e4 LT |
1800 | unsigned int hwoff, |
1801 | unsigned long data, unsigned int off, | |
1802 | snd_pcm_uframes_t frames) | |
1803 | { | |
877211f5 | 1804 | struct snd_pcm_runtime *runtime = substream->runtime; |
1da177e4 LT |
1805 | int err; |
1806 | void __user **bufs = (void __user **)data; | |
1807 | int channels = runtime->channels; | |
1808 | int c; | |
1809 | if (substream->ops->copy) { | |
1810 | snd_assert(substream->ops->silence != NULL, return -EINVAL); | |
1811 | for (c = 0; c < channels; ++c, ++bufs) { | |
1812 | if (*bufs == NULL) { | |
1813 | if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0) | |
1814 | return err; | |
1815 | } else { | |
1816 | char __user *buf = *bufs + samples_to_bytes(runtime, off); | |
1817 | if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0) | |
1818 | return err; | |
1819 | } | |
1820 | } | |
1821 | } else { | |
1822 | /* default transfer behaviour */ | |
1823 | size_t dma_csize = runtime->dma_bytes / channels; | |
1824 | snd_assert(runtime->dma_area, return -EFAULT); | |
1825 | for (c = 0; c < channels; ++c, ++bufs) { | |
1826 | char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff); | |
1827 | if (*bufs == NULL) { | |
1828 | snd_pcm_format_set_silence(runtime->format, hwbuf, frames); | |
1829 | } else { | |
1830 | char __user *buf = *bufs + samples_to_bytes(runtime, off); | |
1831 | if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames))) | |
1832 | return -EFAULT; | |
1833 | } | |
1834 | } | |
1835 | } | |
1836 | return 0; | |
1837 | } | |
1838 | ||
877211f5 | 1839 | snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream, |
1da177e4 LT |
1840 | void __user **bufs, |
1841 | snd_pcm_uframes_t frames) | |
1842 | { | |
877211f5 | 1843 | struct snd_pcm_runtime *runtime; |
1da177e4 LT |
1844 | int nonblock; |
1845 | ||
1846 | snd_assert(substream != NULL, return -ENXIO); | |
1847 | runtime = substream->runtime; | |
1848 | snd_assert(runtime != NULL, return -ENXIO); | |
1849 | snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL); | |
1850 | if (runtime->status->state == SNDRV_PCM_STATE_OPEN) | |
1851 | return -EBADFD; | |
1852 | ||
0df63e44 | 1853 | nonblock = !!(substream->f_flags & O_NONBLOCK); |
1da177e4 LT |
1854 | |
1855 | if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) | |
1856 | return -EINVAL; | |
1857 | return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames, | |
1858 | nonblock, snd_pcm_lib_writev_transfer); | |
1859 | } | |
1860 | ||
e88e8ae6 TI |
1861 | EXPORT_SYMBOL(snd_pcm_lib_writev); |
1862 | ||
877211f5 | 1863 | static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream, |
1da177e4 LT |
1864 | unsigned int hwoff, |
1865 | unsigned long data, unsigned int off, | |
1866 | snd_pcm_uframes_t frames) | |
1867 | { | |
877211f5 | 1868 | struct snd_pcm_runtime *runtime = substream->runtime; |
1da177e4 LT |
1869 | int err; |
1870 | char __user *buf = (char __user *) data + frames_to_bytes(runtime, off); | |
1871 | if (substream->ops->copy) { | |
1872 | if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0) | |
1873 | return err; | |
1874 | } else { | |
1875 | char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff); | |
1876 | snd_assert(runtime->dma_area, return -EFAULT); | |
1877 | if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames))) | |
1878 | return -EFAULT; | |
1879 | } | |
1880 | return 0; | |
1881 | } | |
1882 | ||
877211f5 | 1883 | static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream, |
1da177e4 LT |
1884 | unsigned long data, |
1885 | snd_pcm_uframes_t size, | |
1886 | int nonblock, | |
1887 | transfer_f transfer) | |
1888 | { | |
877211f5 | 1889 | struct snd_pcm_runtime *runtime = substream->runtime; |
1da177e4 LT |
1890 | snd_pcm_uframes_t xfer = 0; |
1891 | snd_pcm_uframes_t offset = 0; | |
1892 | int err = 0; | |
1893 | ||
1894 | if (size == 0) | |
1895 | return 0; | |
1896 | if (size > runtime->xfer_align) | |
1897 | size -= size % runtime->xfer_align; | |
1898 | ||
1899 | snd_pcm_stream_lock_irq(substream); | |
1900 | switch (runtime->status->state) { | |
1901 | case SNDRV_PCM_STATE_PREPARED: | |
1902 | if (size >= runtime->start_threshold) { | |
1903 | err = snd_pcm_start(substream); | |
1904 | if (err < 0) | |
1905 | goto _end_unlock; | |
1906 | } | |
1907 | break; | |
1908 | case SNDRV_PCM_STATE_DRAINING: | |
1909 | case SNDRV_PCM_STATE_RUNNING: | |
1910 | case SNDRV_PCM_STATE_PAUSED: | |
1911 | break; | |
1912 | case SNDRV_PCM_STATE_XRUN: | |
1913 | err = -EPIPE; | |
1914 | goto _end_unlock; | |
1915 | case SNDRV_PCM_STATE_SUSPENDED: | |
1916 | err = -ESTRPIPE; | |
1917 | goto _end_unlock; | |
1918 | default: | |
1919 | err = -EBADFD; | |
1920 | goto _end_unlock; | |
1921 | } | |
1922 | ||
1923 | while (size > 0) { | |
1924 | snd_pcm_uframes_t frames, appl_ptr, appl_ofs; | |
1925 | snd_pcm_uframes_t avail; | |
1926 | snd_pcm_uframes_t cont; | |
1927 | if (runtime->sleep_min == 0 && runtime->status->state == SNDRV_PCM_STATE_RUNNING) | |
1928 | snd_pcm_update_hw_ptr(substream); | |
1929 | __draining: | |
1930 | avail = snd_pcm_capture_avail(runtime); | |
1931 | if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { | |
1932 | if (avail < runtime->xfer_align) { | |
1933 | err = -EPIPE; | |
1934 | goto _end_unlock; | |
1935 | } | |
1936 | } else if ((avail < runtime->control->avail_min && size > avail) || | |
1937 | (size >= runtime->xfer_align && avail < runtime->xfer_align)) { | |
1938 | wait_queue_t wait; | |
443feb88 | 1939 | enum { READY, SIGNALED, ERROR, SUSPENDED, EXPIRED, DROPPED } state; |
1da177e4 LT |
1940 | long tout; |
1941 | ||
1942 | if (nonblock) { | |
1943 | err = -EAGAIN; | |
1944 | goto _end_unlock; | |
1945 | } | |
1946 | ||
1947 | init_waitqueue_entry(&wait, current); | |
1948 | add_wait_queue(&runtime->sleep, &wait); | |
1949 | while (1) { | |
1950 | if (signal_pending(current)) { | |
1951 | state = SIGNALED; | |
1952 | break; | |
1953 | } | |
1954 | set_current_state(TASK_INTERRUPTIBLE); | |
1955 | snd_pcm_stream_unlock_irq(substream); | |
1956 | tout = schedule_timeout(10 * HZ); | |
1957 | snd_pcm_stream_lock_irq(substream); | |
1958 | if (tout == 0) { | |
1959 | if (runtime->status->state != SNDRV_PCM_STATE_PREPARED && | |
1960 | runtime->status->state != SNDRV_PCM_STATE_PAUSED) { | |
1961 | state = runtime->status->state == SNDRV_PCM_STATE_SUSPENDED ? SUSPENDED : EXPIRED; | |
1962 | break; | |
1963 | } | |
1964 | } | |
1965 | switch (runtime->status->state) { | |
1966 | case SNDRV_PCM_STATE_XRUN: | |
1967 | state = ERROR; | |
1968 | goto _end_loop; | |
1969 | case SNDRV_PCM_STATE_SUSPENDED: | |
1970 | state = SUSPENDED; | |
1971 | goto _end_loop; | |
1972 | case SNDRV_PCM_STATE_DRAINING: | |
1973 | goto __draining; | |
443feb88 KW |
1974 | case SNDRV_PCM_STATE_SETUP: |
1975 | state = DROPPED; | |
1976 | goto _end_loop; | |
1da177e4 LT |
1977 | default: |
1978 | break; | |
1979 | } | |
1980 | avail = snd_pcm_capture_avail(runtime); | |
1981 | if (avail >= runtime->control->avail_min) { | |
1982 | state = READY; | |
1983 | break; | |
1984 | } | |
1985 | } | |
1986 | _end_loop: | |
1987 | remove_wait_queue(&runtime->sleep, &wait); | |
1988 | ||
1989 | switch (state) { | |
1990 | case ERROR: | |
1991 | err = -EPIPE; | |
1992 | goto _end_unlock; | |
1993 | case SUSPENDED: | |
1994 | err = -ESTRPIPE; | |
1995 | goto _end_unlock; | |
1996 | case SIGNALED: | |
1997 | err = -ERESTARTSYS; | |
1998 | goto _end_unlock; | |
1999 | case EXPIRED: | |
2000 | snd_printd("capture read error (DMA or IRQ trouble?)\n"); | |
2001 | err = -EIO; | |
2002 | goto _end_unlock; | |
443feb88 KW |
2003 | case DROPPED: |
2004 | err = -EBADFD; | |
2005 | goto _end_unlock; | |
1da177e4 LT |
2006 | default: |
2007 | break; | |
2008 | } | |
2009 | } | |
2010 | if (avail > runtime->xfer_align) | |
2011 | avail -= avail % runtime->xfer_align; | |
2012 | frames = size > avail ? avail : size; | |
2013 | cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size; | |
2014 | if (frames > cont) | |
2015 | frames = cont; | |
2016 | snd_assert(frames != 0, snd_pcm_stream_unlock_irq(substream); return -EINVAL); | |
2017 | appl_ptr = runtime->control->appl_ptr; | |
2018 | appl_ofs = appl_ptr % runtime->buffer_size; | |
2019 | snd_pcm_stream_unlock_irq(substream); | |
2020 | if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0) | |
2021 | goto _end; | |
2022 | snd_pcm_stream_lock_irq(substream); | |
2023 | switch (runtime->status->state) { | |
2024 | case SNDRV_PCM_STATE_XRUN: | |
2025 | err = -EPIPE; | |
2026 | goto _end_unlock; | |
2027 | case SNDRV_PCM_STATE_SUSPENDED: | |
2028 | err = -ESTRPIPE; | |
2029 | goto _end_unlock; | |
2030 | default: | |
2031 | break; | |
2032 | } | |
2033 | appl_ptr += frames; | |
2034 | if (appl_ptr >= runtime->boundary) | |
2035 | appl_ptr -= runtime->boundary; | |
2036 | runtime->control->appl_ptr = appl_ptr; | |
2037 | if (substream->ops->ack) | |
2038 | substream->ops->ack(substream); | |
2039 | ||
2040 | offset += frames; | |
2041 | size -= frames; | |
2042 | xfer += frames; | |
2043 | if (runtime->sleep_min && | |
2044 | runtime->status->state == SNDRV_PCM_STATE_RUNNING) | |
2045 | snd_pcm_tick_prepare(substream); | |
2046 | } | |
2047 | _end_unlock: | |
2048 | snd_pcm_stream_unlock_irq(substream); | |
2049 | _end: | |
2050 | return xfer > 0 ? (snd_pcm_sframes_t)xfer : err; | |
2051 | } | |
2052 | ||
877211f5 | 2053 | snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, void __user *buf, snd_pcm_uframes_t size) |
1da177e4 | 2054 | { |
877211f5 | 2055 | struct snd_pcm_runtime *runtime; |
1da177e4 LT |
2056 | int nonblock; |
2057 | ||
2058 | snd_assert(substream != NULL, return -ENXIO); | |
2059 | runtime = substream->runtime; | |
2060 | snd_assert(runtime != NULL, return -ENXIO); | |
2061 | snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL); | |
2062 | if (runtime->status->state == SNDRV_PCM_STATE_OPEN) | |
2063 | return -EBADFD; | |
2064 | ||
0df63e44 | 2065 | nonblock = !!(substream->f_flags & O_NONBLOCK); |
1da177e4 LT |
2066 | if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED) |
2067 | return -EINVAL; | |
2068 | return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer); | |
2069 | } | |
2070 | ||
e88e8ae6 TI |
2071 | EXPORT_SYMBOL(snd_pcm_lib_read); |
2072 | ||
877211f5 | 2073 | static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream, |
1da177e4 LT |
2074 | unsigned int hwoff, |
2075 | unsigned long data, unsigned int off, | |
2076 | snd_pcm_uframes_t frames) | |
2077 | { | |
877211f5 | 2078 | struct snd_pcm_runtime *runtime = substream->runtime; |
1da177e4 LT |
2079 | int err; |
2080 | void __user **bufs = (void __user **)data; | |
2081 | int channels = runtime->channels; | |
2082 | int c; | |
2083 | if (substream->ops->copy) { | |
2084 | for (c = 0; c < channels; ++c, ++bufs) { | |
2085 | char __user *buf; | |
2086 | if (*bufs == NULL) | |
2087 | continue; | |
2088 | buf = *bufs + samples_to_bytes(runtime, off); | |
2089 | if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0) | |
2090 | return err; | |
2091 | } | |
2092 | } else { | |
2093 | snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels; | |
2094 | snd_assert(runtime->dma_area, return -EFAULT); | |
2095 | for (c = 0; c < channels; ++c, ++bufs) { | |
2096 | char *hwbuf; | |
2097 | char __user *buf; | |
2098 | if (*bufs == NULL) | |
2099 | continue; | |
2100 | ||
2101 | hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff); | |
2102 | buf = *bufs + samples_to_bytes(runtime, off); | |
2103 | if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames))) | |
2104 | return -EFAULT; | |
2105 | } | |
2106 | } | |
2107 | return 0; | |
2108 | } | |
2109 | ||
877211f5 | 2110 | snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream, |
1da177e4 LT |
2111 | void __user **bufs, |
2112 | snd_pcm_uframes_t frames) | |
2113 | { | |
877211f5 | 2114 | struct snd_pcm_runtime *runtime; |
1da177e4 LT |
2115 | int nonblock; |
2116 | ||
2117 | snd_assert(substream != NULL, return -ENXIO); | |
2118 | runtime = substream->runtime; | |
2119 | snd_assert(runtime != NULL, return -ENXIO); | |
2120 | snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL); | |
2121 | if (runtime->status->state == SNDRV_PCM_STATE_OPEN) | |
2122 | return -EBADFD; | |
2123 | ||
0df63e44 | 2124 | nonblock = !!(substream->f_flags & O_NONBLOCK); |
1da177e4 LT |
2125 | if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) |
2126 | return -EINVAL; | |
2127 | return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer); | |
2128 | } | |
2129 | ||
1da177e4 | 2130 | EXPORT_SYMBOL(snd_pcm_lib_readv); |