Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Digital Audio (PCM) abstract layer | |
c1017a4c | 3 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
1da177e4 LT |
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 | ||
1da177e4 LT |
23 | #include <linux/slab.h> |
24 | #include <linux/time.h> | |
25 | #include <sound/core.h> | |
26 | #include <sound/control.h> | |
27 | #include <sound/info.h> | |
28 | #include <sound/pcm.h> | |
29 | #include <sound/pcm_params.h> | |
30 | #include <sound/timer.h> | |
31 | ||
32 | /* | |
33 | * fill ring buffer with silence | |
34 | * runtime->silence_start: starting pointer to silence area | |
35 | * runtime->silence_filled: size filled with silence | |
36 | * runtime->silence_threshold: threshold from application | |
37 | * runtime->silence_size: maximal size from application | |
38 | * | |
39 | * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately | |
40 | */ | |
877211f5 | 41 | void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr) |
1da177e4 | 42 | { |
877211f5 | 43 | struct snd_pcm_runtime *runtime = substream->runtime; |
1da177e4 LT |
44 | snd_pcm_uframes_t frames, ofs, transfer; |
45 | ||
46 | if (runtime->silence_size < runtime->boundary) { | |
47 | snd_pcm_sframes_t noise_dist, n; | |
48 | if (runtime->silence_start != runtime->control->appl_ptr) { | |
49 | n = runtime->control->appl_ptr - runtime->silence_start; | |
50 | if (n < 0) | |
51 | n += runtime->boundary; | |
52 | if ((snd_pcm_uframes_t)n < runtime->silence_filled) | |
53 | runtime->silence_filled -= n; | |
54 | else | |
55 | runtime->silence_filled = 0; | |
56 | runtime->silence_start = runtime->control->appl_ptr; | |
57 | } | |
235475cb | 58 | if (runtime->silence_filled >= runtime->buffer_size) |
1da177e4 | 59 | return; |
1da177e4 LT |
60 | noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled; |
61 | if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold) | |
62 | return; | |
63 | frames = runtime->silence_threshold - noise_dist; | |
64 | if (frames > runtime->silence_size) | |
65 | frames = runtime->silence_size; | |
66 | } else { | |
67 | if (new_hw_ptr == ULONG_MAX) { /* initialization */ | |
68 | snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime); | |
69 | runtime->silence_filled = avail > 0 ? avail : 0; | |
70 | runtime->silence_start = (runtime->status->hw_ptr + | |
71 | runtime->silence_filled) % | |
72 | runtime->boundary; | |
73 | } else { | |
74 | ofs = runtime->status->hw_ptr; | |
75 | frames = new_hw_ptr - ofs; | |
76 | if ((snd_pcm_sframes_t)frames < 0) | |
77 | frames += runtime->boundary; | |
78 | runtime->silence_filled -= frames; | |
79 | if ((snd_pcm_sframes_t)runtime->silence_filled < 0) { | |
80 | runtime->silence_filled = 0; | |
9a826ddb | 81 | runtime->silence_start = new_hw_ptr; |
1da177e4 | 82 | } else { |
9a826ddb | 83 | runtime->silence_start = ofs; |
1da177e4 | 84 | } |
1da177e4 LT |
85 | } |
86 | frames = runtime->buffer_size - runtime->silence_filled; | |
87 | } | |
7eaa943c TI |
88 | if (snd_BUG_ON(frames > runtime->buffer_size)) |
89 | return; | |
1da177e4 LT |
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); | |
7eaa943c | 100 | snd_BUG_ON(err < 0); |
1da177e4 LT |
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); | |
7eaa943c | 112 | snd_BUG_ON(err < 0); |
1da177e4 LT |
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 | ||
ed3da3d9 TI |
128 | #ifdef CONFIG_SND_PCM_XRUN_DEBUG |
129 | #define xrun_debug(substream) ((substream)->pstr->xrun_debug) | |
130 | #else | |
131 | #define xrun_debug(substream) 0 | |
132 | #endif | |
133 | ||
134 | #define dump_stack_on_xrun(substream) do { \ | |
135 | if (xrun_debug(substream) > 1) \ | |
136 | dump_stack(); \ | |
137 | } while (0) | |
138 | ||
877211f5 | 139 | static void xrun(struct snd_pcm_substream *substream) |
1da177e4 LT |
140 | { |
141 | snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); | |
ed3da3d9 | 142 | if (xrun_debug(substream)) { |
1da177e4 LT |
143 | snd_printd(KERN_DEBUG "XRUN: pcmC%dD%d%c\n", |
144 | substream->pcm->card->number, | |
145 | substream->pcm->device, | |
146 | substream->stream ? 'c' : 'p'); | |
ed3da3d9 | 147 | dump_stack_on_xrun(substream); |
1da177e4 | 148 | } |
1da177e4 LT |
149 | } |
150 | ||
98204646 TI |
151 | static snd_pcm_uframes_t |
152 | snd_pcm_update_hw_ptr_pos(struct snd_pcm_substream *substream, | |
153 | struct snd_pcm_runtime *runtime) | |
1da177e4 LT |
154 | { |
155 | snd_pcm_uframes_t pos; | |
156 | ||
8c121586 JK |
157 | if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) |
158 | snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp); | |
1da177e4 LT |
159 | pos = substream->ops->pointer(substream); |
160 | if (pos == SNDRV_PCM_POS_XRUN) | |
161 | return pos; /* XRUN */ | |
1da177e4 | 162 | if (pos >= runtime->buffer_size) { |
5f513e11 TI |
163 | if (printk_ratelimit()) { |
164 | snd_printd(KERN_ERR "BUG: stream = %i, pos = 0x%lx, " | |
165 | "buffer size = 0x%lx, period size = 0x%lx\n", | |
166 | substream->stream, pos, runtime->buffer_size, | |
167 | runtime->period_size); | |
168 | } | |
169 | pos = 0; | |
7c22f1aa | 170 | } |
1da177e4 LT |
171 | pos -= pos % runtime->min_align; |
172 | return pos; | |
173 | } | |
174 | ||
98204646 TI |
175 | static int snd_pcm_update_hw_ptr_post(struct snd_pcm_substream *substream, |
176 | struct snd_pcm_runtime *runtime) | |
1da177e4 LT |
177 | { |
178 | snd_pcm_uframes_t avail; | |
179 | ||
180 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
181 | avail = snd_pcm_playback_avail(runtime); | |
182 | else | |
183 | avail = snd_pcm_capture_avail(runtime); | |
184 | if (avail > runtime->avail_max) | |
185 | runtime->avail_max = avail; | |
186 | if (avail >= runtime->stop_threshold) { | |
187 | if (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING) | |
188 | snd_pcm_drain_done(substream); | |
189 | else | |
190 | xrun(substream); | |
191 | return -EPIPE; | |
192 | } | |
193 | if (avail >= runtime->control->avail_min) | |
194 | wake_up(&runtime->sleep); | |
195 | return 0; | |
196 | } | |
197 | ||
ed3da3d9 TI |
198 | #define hw_ptr_error(substream, fmt, args...) \ |
199 | do { \ | |
200 | if (xrun_debug(substream)) { \ | |
201 | if (printk_ratelimit()) { \ | |
cad377ac | 202 | snd_printd("PCM: " fmt, ##args); \ |
ed3da3d9 TI |
203 | } \ |
204 | dump_stack_on_xrun(substream); \ | |
205 | } \ | |
206 | } while (0) | |
207 | ||
98204646 | 208 | static int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream *substream) |
1da177e4 | 209 | { |
877211f5 | 210 | struct snd_pcm_runtime *runtime = substream->runtime; |
1da177e4 | 211 | snd_pcm_uframes_t pos; |
bbf6ad13 JK |
212 | snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_ptr_interrupt, hw_base; |
213 | snd_pcm_sframes_t hdelta, delta; | |
214 | unsigned long jdelta; | |
1da177e4 | 215 | |
bbf6ad13 | 216 | old_hw_ptr = runtime->status->hw_ptr; |
1da177e4 LT |
217 | pos = snd_pcm_update_hw_ptr_pos(substream, runtime); |
218 | if (pos == SNDRV_PCM_POS_XRUN) { | |
219 | xrun(substream); | |
220 | return -EPIPE; | |
221 | } | |
ed3da3d9 TI |
222 | hw_base = runtime->hw_ptr_base; |
223 | new_hw_ptr = hw_base + pos; | |
1da177e4 | 224 | hw_ptr_interrupt = runtime->hw_ptr_interrupt + runtime->period_size; |
ed3da3d9 | 225 | delta = new_hw_ptr - hw_ptr_interrupt; |
ded652f7 | 226 | if (hw_ptr_interrupt >= runtime->boundary) { |
8b22d943 TI |
227 | hw_ptr_interrupt -= runtime->boundary; |
228 | if (hw_base < runtime->boundary / 2) | |
229 | /* hw_base was already lapped; recalc delta */ | |
ded652f7 TI |
230 | delta = new_hw_ptr - hw_ptr_interrupt; |
231 | } | |
ed3da3d9 TI |
232 | if (delta < 0) { |
233 | delta += runtime->buffer_size; | |
234 | if (delta < 0) { | |
235 | hw_ptr_error(substream, | |
236 | "Unexpected hw_pointer value " | |
237 | "(stream=%i, pos=%ld, intr_ptr=%ld)\n", | |
238 | substream->stream, (long)pos, | |
239 | (long)hw_ptr_interrupt); | |
240 | /* rebase to interrupt position */ | |
241 | hw_base = new_hw_ptr = hw_ptr_interrupt; | |
ded652f7 TI |
242 | /* align hw_base to buffer_size */ |
243 | hw_base -= hw_base % runtime->buffer_size; | |
ed3da3d9 TI |
244 | delta = 0; |
245 | } else { | |
246 | hw_base += runtime->buffer_size; | |
8b22d943 | 247 | if (hw_base >= runtime->boundary) |
ed3da3d9 TI |
248 | hw_base = 0; |
249 | new_hw_ptr = hw_base + pos; | |
1da177e4 | 250 | } |
1da177e4 | 251 | } |
bbf6ad13 JK |
252 | hdelta = new_hw_ptr - old_hw_ptr; |
253 | jdelta = jiffies - runtime->hw_ptr_jiffies; | |
254 | if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) { | |
255 | delta = jdelta / | |
256 | (((runtime->period_size * HZ) / runtime->rate) | |
257 | + HZ/100); | |
258 | hw_ptr_error(substream, | |
259 | "hw_ptr skipping! [Q] " | |
260 | "(pos=%ld, delta=%ld, period=%ld, " | |
261 | "jdelta=%lu/%lu/%lu)\n", | |
262 | (long)pos, (long)hdelta, | |
263 | (long)runtime->period_size, jdelta, | |
264 | ((hdelta * HZ) / runtime->rate), delta); | |
265 | hw_ptr_interrupt = runtime->hw_ptr_interrupt + | |
266 | runtime->period_size * delta; | |
267 | if (hw_ptr_interrupt >= runtime->boundary) | |
268 | hw_ptr_interrupt -= runtime->boundary; | |
269 | /* rebase to interrupt position */ | |
270 | hw_base = new_hw_ptr = hw_ptr_interrupt; | |
271 | /* align hw_base to buffer_size */ | |
272 | hw_base -= hw_base % runtime->buffer_size; | |
273 | delta = 0; | |
274 | } | |
275 | if (delta > runtime->period_size + runtime->period_size / 2) { | |
ed3da3d9 TI |
276 | hw_ptr_error(substream, |
277 | "Lost interrupts? " | |
278 | "(stream=%i, delta=%ld, intr_ptr=%ld)\n", | |
279 | substream->stream, (long)delta, | |
280 | (long)hw_ptr_interrupt); | |
281 | /* rebase hw_ptr_interrupt */ | |
282 | hw_ptr_interrupt = | |
283 | new_hw_ptr - new_hw_ptr % runtime->period_size; | |
284 | } | |
1da177e4 LT |
285 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && |
286 | runtime->silence_size > 0) | |
287 | snd_pcm_playback_silence(substream, new_hw_ptr); | |
288 | ||
ed3da3d9 | 289 | runtime->hw_ptr_base = hw_base; |
1da177e4 | 290 | runtime->status->hw_ptr = new_hw_ptr; |
bbf6ad13 | 291 | runtime->hw_ptr_jiffies = jiffies; |
ed3da3d9 | 292 | runtime->hw_ptr_interrupt = hw_ptr_interrupt; |
1da177e4 LT |
293 | |
294 | return snd_pcm_update_hw_ptr_post(substream, runtime); | |
295 | } | |
296 | ||
297 | /* CAUTION: call it with irq disabled */ | |
877211f5 | 298 | int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream) |
1da177e4 | 299 | { |
877211f5 | 300 | struct snd_pcm_runtime *runtime = substream->runtime; |
1da177e4 | 301 | snd_pcm_uframes_t pos; |
ed3da3d9 | 302 | snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base; |
1da177e4 | 303 | snd_pcm_sframes_t delta; |
bbf6ad13 | 304 | unsigned long jdelta; |
1da177e4 LT |
305 | |
306 | old_hw_ptr = runtime->status->hw_ptr; | |
307 | pos = snd_pcm_update_hw_ptr_pos(substream, runtime); | |
308 | if (pos == SNDRV_PCM_POS_XRUN) { | |
309 | xrun(substream); | |
310 | return -EPIPE; | |
311 | } | |
ed3da3d9 TI |
312 | hw_base = runtime->hw_ptr_base; |
313 | new_hw_ptr = hw_base + pos; | |
1da177e4 | 314 | |
ed3da3d9 | 315 | delta = new_hw_ptr - old_hw_ptr; |
bbf6ad13 | 316 | jdelta = jiffies - runtime->hw_ptr_jiffies; |
ed3da3d9 TI |
317 | if (delta < 0) { |
318 | delta += runtime->buffer_size; | |
319 | if (delta < 0) { | |
320 | hw_ptr_error(substream, | |
321 | "Unexpected hw_pointer value [2] " | |
bbf6ad13 | 322 | "(stream=%i, pos=%ld, old_ptr=%ld, jdelta=%li)\n", |
ed3da3d9 | 323 | substream->stream, (long)pos, |
bbf6ad13 | 324 | (long)old_hw_ptr, jdelta); |
1da177e4 LT |
325 | return 0; |
326 | } | |
ed3da3d9 | 327 | hw_base += runtime->buffer_size; |
8b22d943 | 328 | if (hw_base >= runtime->boundary) |
ed3da3d9 TI |
329 | hw_base = 0; |
330 | new_hw_ptr = hw_base + pos; | |
331 | } | |
bbf6ad13 | 332 | if (((delta * HZ) / runtime->rate) > jdelta + HZ/100) { |
ed3da3d9 TI |
333 | hw_ptr_error(substream, |
334 | "hw_ptr skipping! " | |
bbf6ad13 | 335 | "(pos=%ld, delta=%ld, period=%ld, jdelta=%lu/%lu)\n", |
ed3da3d9 | 336 | (long)pos, (long)delta, |
bbf6ad13 JK |
337 | (long)runtime->period_size, jdelta, |
338 | ((delta * HZ) / runtime->rate)); | |
ed3da3d9 | 339 | return 0; |
1da177e4 LT |
340 | } |
341 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && | |
342 | runtime->silence_size > 0) | |
343 | snd_pcm_playback_silence(substream, new_hw_ptr); | |
344 | ||
ed3da3d9 | 345 | runtime->hw_ptr_base = hw_base; |
1da177e4 | 346 | runtime->status->hw_ptr = new_hw_ptr; |
bbf6ad13 | 347 | runtime->hw_ptr_jiffies = jiffies; |
1da177e4 LT |
348 | |
349 | return snd_pcm_update_hw_ptr_post(substream, runtime); | |
350 | } | |
351 | ||
352 | /** | |
353 | * snd_pcm_set_ops - set the PCM operators | |
354 | * @pcm: the pcm instance | |
355 | * @direction: stream direction, SNDRV_PCM_STREAM_XXX | |
356 | * @ops: the operator table | |
357 | * | |
358 | * Sets the given PCM operators to the pcm instance. | |
359 | */ | |
877211f5 | 360 | void snd_pcm_set_ops(struct snd_pcm *pcm, int direction, struct snd_pcm_ops *ops) |
1da177e4 | 361 | { |
877211f5 TI |
362 | struct snd_pcm_str *stream = &pcm->streams[direction]; |
363 | struct snd_pcm_substream *substream; | |
1da177e4 LT |
364 | |
365 | for (substream = stream->substream; substream != NULL; substream = substream->next) | |
366 | substream->ops = ops; | |
367 | } | |
368 | ||
e88e8ae6 | 369 | EXPORT_SYMBOL(snd_pcm_set_ops); |
1da177e4 LT |
370 | |
371 | /** | |
372 | * snd_pcm_sync - set the PCM sync id | |
373 | * @substream: the pcm substream | |
374 | * | |
375 | * Sets the PCM sync identifier for the card. | |
376 | */ | |
877211f5 | 377 | void snd_pcm_set_sync(struct snd_pcm_substream *substream) |
1da177e4 | 378 | { |
877211f5 | 379 | struct snd_pcm_runtime *runtime = substream->runtime; |
1da177e4 LT |
380 | |
381 | runtime->sync.id32[0] = substream->pcm->card->number; | |
382 | runtime->sync.id32[1] = -1; | |
383 | runtime->sync.id32[2] = -1; | |
384 | runtime->sync.id32[3] = -1; | |
385 | } | |
386 | ||
e88e8ae6 TI |
387 | EXPORT_SYMBOL(snd_pcm_set_sync); |
388 | ||
1da177e4 LT |
389 | /* |
390 | * Standard ioctl routine | |
391 | */ | |
392 | ||
1da177e4 LT |
393 | static inline unsigned int div32(unsigned int a, unsigned int b, |
394 | unsigned int *r) | |
395 | { | |
396 | if (b == 0) { | |
397 | *r = 0; | |
398 | return UINT_MAX; | |
399 | } | |
400 | *r = a % b; | |
401 | return a / b; | |
402 | } | |
403 | ||
404 | static inline unsigned int div_down(unsigned int a, unsigned int b) | |
405 | { | |
406 | if (b == 0) | |
407 | return UINT_MAX; | |
408 | return a / b; | |
409 | } | |
410 | ||
411 | static inline unsigned int div_up(unsigned int a, unsigned int b) | |
412 | { | |
413 | unsigned int r; | |
414 | unsigned int q; | |
415 | if (b == 0) | |
416 | return UINT_MAX; | |
417 | q = div32(a, b, &r); | |
418 | if (r) | |
419 | ++q; | |
420 | return q; | |
421 | } | |
422 | ||
423 | static inline unsigned int mul(unsigned int a, unsigned int b) | |
424 | { | |
425 | if (a == 0) | |
426 | return 0; | |
427 | if (div_down(UINT_MAX, a) < b) | |
428 | return UINT_MAX; | |
429 | return a * b; | |
430 | } | |
431 | ||
432 | static inline unsigned int muldiv32(unsigned int a, unsigned int b, | |
433 | unsigned int c, unsigned int *r) | |
434 | { | |
435 | u_int64_t n = (u_int64_t) a * b; | |
436 | if (c == 0) { | |
7eaa943c | 437 | snd_BUG_ON(!n); |
1da177e4 LT |
438 | *r = 0; |
439 | return UINT_MAX; | |
440 | } | |
441 | div64_32(&n, c, r); | |
442 | if (n >= UINT_MAX) { | |
443 | *r = 0; | |
444 | return UINT_MAX; | |
445 | } | |
446 | return n; | |
447 | } | |
448 | ||
1da177e4 LT |
449 | /** |
450 | * snd_interval_refine - refine the interval value of configurator | |
451 | * @i: the interval value to refine | |
452 | * @v: the interval value to refer to | |
453 | * | |
454 | * Refines the interval value with the reference value. | |
455 | * The interval is changed to the range satisfying both intervals. | |
456 | * The interval status (min, max, integer, etc.) are evaluated. | |
457 | * | |
458 | * Returns non-zero if the value is changed, zero if not changed. | |
459 | */ | |
877211f5 | 460 | int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v) |
1da177e4 LT |
461 | { |
462 | int changed = 0; | |
7eaa943c TI |
463 | if (snd_BUG_ON(snd_interval_empty(i))) |
464 | return -EINVAL; | |
1da177e4 LT |
465 | if (i->min < v->min) { |
466 | i->min = v->min; | |
467 | i->openmin = v->openmin; | |
468 | changed = 1; | |
469 | } else if (i->min == v->min && !i->openmin && v->openmin) { | |
470 | i->openmin = 1; | |
471 | changed = 1; | |
472 | } | |
473 | if (i->max > v->max) { | |
474 | i->max = v->max; | |
475 | i->openmax = v->openmax; | |
476 | changed = 1; | |
477 | } else if (i->max == v->max && !i->openmax && v->openmax) { | |
478 | i->openmax = 1; | |
479 | changed = 1; | |
480 | } | |
481 | if (!i->integer && v->integer) { | |
482 | i->integer = 1; | |
483 | changed = 1; | |
484 | } | |
485 | if (i->integer) { | |
486 | if (i->openmin) { | |
487 | i->min++; | |
488 | i->openmin = 0; | |
489 | } | |
490 | if (i->openmax) { | |
491 | i->max--; | |
492 | i->openmax = 0; | |
493 | } | |
494 | } else if (!i->openmin && !i->openmax && i->min == i->max) | |
495 | i->integer = 1; | |
496 | if (snd_interval_checkempty(i)) { | |
497 | snd_interval_none(i); | |
498 | return -EINVAL; | |
499 | } | |
500 | return changed; | |
501 | } | |
502 | ||
e88e8ae6 TI |
503 | EXPORT_SYMBOL(snd_interval_refine); |
504 | ||
877211f5 | 505 | static int snd_interval_refine_first(struct snd_interval *i) |
1da177e4 | 506 | { |
7eaa943c TI |
507 | if (snd_BUG_ON(snd_interval_empty(i))) |
508 | return -EINVAL; | |
1da177e4 LT |
509 | if (snd_interval_single(i)) |
510 | return 0; | |
511 | i->max = i->min; | |
512 | i->openmax = i->openmin; | |
513 | if (i->openmax) | |
514 | i->max++; | |
515 | return 1; | |
516 | } | |
517 | ||
877211f5 | 518 | static int snd_interval_refine_last(struct snd_interval *i) |
1da177e4 | 519 | { |
7eaa943c TI |
520 | if (snd_BUG_ON(snd_interval_empty(i))) |
521 | return -EINVAL; | |
1da177e4 LT |
522 | if (snd_interval_single(i)) |
523 | return 0; | |
524 | i->min = i->max; | |
525 | i->openmin = i->openmax; | |
526 | if (i->openmin) | |
527 | i->min--; | |
528 | return 1; | |
529 | } | |
530 | ||
877211f5 | 531 | void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c) |
1da177e4 LT |
532 | { |
533 | if (a->empty || b->empty) { | |
534 | snd_interval_none(c); | |
535 | return; | |
536 | } | |
537 | c->empty = 0; | |
538 | c->min = mul(a->min, b->min); | |
539 | c->openmin = (a->openmin || b->openmin); | |
540 | c->max = mul(a->max, b->max); | |
541 | c->openmax = (a->openmax || b->openmax); | |
542 | c->integer = (a->integer && b->integer); | |
543 | } | |
544 | ||
545 | /** | |
546 | * snd_interval_div - refine the interval value with division | |
df8db936 TI |
547 | * @a: dividend |
548 | * @b: divisor | |
549 | * @c: quotient | |
1da177e4 LT |
550 | * |
551 | * c = a / b | |
552 | * | |
553 | * Returns non-zero if the value is changed, zero if not changed. | |
554 | */ | |
877211f5 | 555 | void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c) |
1da177e4 LT |
556 | { |
557 | unsigned int r; | |
558 | if (a->empty || b->empty) { | |
559 | snd_interval_none(c); | |
560 | return; | |
561 | } | |
562 | c->empty = 0; | |
563 | c->min = div32(a->min, b->max, &r); | |
564 | c->openmin = (r || a->openmin || b->openmax); | |
565 | if (b->min > 0) { | |
566 | c->max = div32(a->max, b->min, &r); | |
567 | if (r) { | |
568 | c->max++; | |
569 | c->openmax = 1; | |
570 | } else | |
571 | c->openmax = (a->openmax || b->openmin); | |
572 | } else { | |
573 | c->max = UINT_MAX; | |
574 | c->openmax = 0; | |
575 | } | |
576 | c->integer = 0; | |
577 | } | |
578 | ||
579 | /** | |
580 | * snd_interval_muldivk - refine the interval value | |
df8db936 TI |
581 | * @a: dividend 1 |
582 | * @b: dividend 2 | |
583 | * @k: divisor (as integer) | |
584 | * @c: result | |
585 | * | |
1da177e4 LT |
586 | * c = a * b / k |
587 | * | |
588 | * Returns non-zero if the value is changed, zero if not changed. | |
589 | */ | |
877211f5 TI |
590 | void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b, |
591 | unsigned int k, struct snd_interval *c) | |
1da177e4 LT |
592 | { |
593 | unsigned int r; | |
594 | if (a->empty || b->empty) { | |
595 | snd_interval_none(c); | |
596 | return; | |
597 | } | |
598 | c->empty = 0; | |
599 | c->min = muldiv32(a->min, b->min, k, &r); | |
600 | c->openmin = (r || a->openmin || b->openmin); | |
601 | c->max = muldiv32(a->max, b->max, k, &r); | |
602 | if (r) { | |
603 | c->max++; | |
604 | c->openmax = 1; | |
605 | } else | |
606 | c->openmax = (a->openmax || b->openmax); | |
607 | c->integer = 0; | |
608 | } | |
609 | ||
610 | /** | |
611 | * snd_interval_mulkdiv - refine the interval value | |
df8db936 TI |
612 | * @a: dividend 1 |
613 | * @k: dividend 2 (as integer) | |
614 | * @b: divisor | |
615 | * @c: result | |
1da177e4 LT |
616 | * |
617 | * c = a * k / b | |
618 | * | |
619 | * Returns non-zero if the value is changed, zero if not changed. | |
620 | */ | |
877211f5 TI |
621 | void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k, |
622 | const struct snd_interval *b, struct snd_interval *c) | |
1da177e4 LT |
623 | { |
624 | unsigned int r; | |
625 | if (a->empty || b->empty) { | |
626 | snd_interval_none(c); | |
627 | return; | |
628 | } | |
629 | c->empty = 0; | |
630 | c->min = muldiv32(a->min, k, b->max, &r); | |
631 | c->openmin = (r || a->openmin || b->openmax); | |
632 | if (b->min > 0) { | |
633 | c->max = muldiv32(a->max, k, b->min, &r); | |
634 | if (r) { | |
635 | c->max++; | |
636 | c->openmax = 1; | |
637 | } else | |
638 | c->openmax = (a->openmax || b->openmin); | |
639 | } else { | |
640 | c->max = UINT_MAX; | |
641 | c->openmax = 0; | |
642 | } | |
643 | c->integer = 0; | |
644 | } | |
645 | ||
1da177e4 LT |
646 | /* ---- */ |
647 | ||
648 | ||
649 | /** | |
650 | * snd_interval_ratnum - refine the interval value | |
df8db936 TI |
651 | * @i: interval to refine |
652 | * @rats_count: number of ratnum_t | |
653 | * @rats: ratnum_t array | |
654 | * @nump: pointer to store the resultant numerator | |
655 | * @denp: pointer to store the resultant denominator | |
1da177e4 LT |
656 | * |
657 | * Returns non-zero if the value is changed, zero if not changed. | |
658 | */ | |
877211f5 TI |
659 | int snd_interval_ratnum(struct snd_interval *i, |
660 | unsigned int rats_count, struct snd_ratnum *rats, | |
661 | unsigned int *nump, unsigned int *denp) | |
1da177e4 LT |
662 | { |
663 | unsigned int best_num, best_diff, best_den; | |
664 | unsigned int k; | |
877211f5 | 665 | struct snd_interval t; |
1da177e4 LT |
666 | int err; |
667 | ||
668 | best_num = best_den = best_diff = 0; | |
669 | for (k = 0; k < rats_count; ++k) { | |
670 | unsigned int num = rats[k].num; | |
671 | unsigned int den; | |
672 | unsigned int q = i->min; | |
673 | int diff; | |
674 | if (q == 0) | |
675 | q = 1; | |
676 | den = div_down(num, q); | |
677 | if (den < rats[k].den_min) | |
678 | continue; | |
679 | if (den > rats[k].den_max) | |
680 | den = rats[k].den_max; | |
681 | else { | |
682 | unsigned int r; | |
683 | r = (den - rats[k].den_min) % rats[k].den_step; | |
684 | if (r != 0) | |
685 | den -= r; | |
686 | } | |
687 | diff = num - q * den; | |
688 | if (best_num == 0 || | |
689 | diff * best_den < best_diff * den) { | |
690 | best_diff = diff; | |
691 | best_den = den; | |
692 | best_num = num; | |
693 | } | |
694 | } | |
695 | if (best_den == 0) { | |
696 | i->empty = 1; | |
697 | return -EINVAL; | |
698 | } | |
699 | t.min = div_down(best_num, best_den); | |
700 | t.openmin = !!(best_num % best_den); | |
701 | ||
702 | best_num = best_den = best_diff = 0; | |
703 | for (k = 0; k < rats_count; ++k) { | |
704 | unsigned int num = rats[k].num; | |
705 | unsigned int den; | |
706 | unsigned int q = i->max; | |
707 | int diff; | |
708 | if (q == 0) { | |
709 | i->empty = 1; | |
710 | return -EINVAL; | |
711 | } | |
712 | den = div_up(num, q); | |
713 | if (den > rats[k].den_max) | |
714 | continue; | |
715 | if (den < rats[k].den_min) | |
716 | den = rats[k].den_min; | |
717 | else { | |
718 | unsigned int r; | |
719 | r = (den - rats[k].den_min) % rats[k].den_step; | |
720 | if (r != 0) | |
721 | den += rats[k].den_step - r; | |
722 | } | |
723 | diff = q * den - num; | |
724 | if (best_num == 0 || | |
725 | diff * best_den < best_diff * den) { | |
726 | best_diff = diff; | |
727 | best_den = den; | |
728 | best_num = num; | |
729 | } | |
730 | } | |
731 | if (best_den == 0) { | |
732 | i->empty = 1; | |
733 | return -EINVAL; | |
734 | } | |
735 | t.max = div_up(best_num, best_den); | |
736 | t.openmax = !!(best_num % best_den); | |
737 | t.integer = 0; | |
738 | err = snd_interval_refine(i, &t); | |
739 | if (err < 0) | |
740 | return err; | |
741 | ||
742 | if (snd_interval_single(i)) { | |
743 | if (nump) | |
744 | *nump = best_num; | |
745 | if (denp) | |
746 | *denp = best_den; | |
747 | } | |
748 | return err; | |
749 | } | |
750 | ||
e88e8ae6 TI |
751 | EXPORT_SYMBOL(snd_interval_ratnum); |
752 | ||
1da177e4 LT |
753 | /** |
754 | * snd_interval_ratden - refine the interval value | |
df8db936 | 755 | * @i: interval to refine |
877211f5 TI |
756 | * @rats_count: number of struct ratden |
757 | * @rats: struct ratden array | |
df8db936 TI |
758 | * @nump: pointer to store the resultant numerator |
759 | * @denp: pointer to store the resultant denominator | |
1da177e4 LT |
760 | * |
761 | * Returns non-zero if the value is changed, zero if not changed. | |
762 | */ | |
877211f5 TI |
763 | static int snd_interval_ratden(struct snd_interval *i, |
764 | unsigned int rats_count, struct snd_ratden *rats, | |
1da177e4 LT |
765 | unsigned int *nump, unsigned int *denp) |
766 | { | |
767 | unsigned int best_num, best_diff, best_den; | |
768 | unsigned int k; | |
877211f5 | 769 | struct snd_interval t; |
1da177e4 LT |
770 | int err; |
771 | ||
772 | best_num = best_den = best_diff = 0; | |
773 | for (k = 0; k < rats_count; ++k) { | |
774 | unsigned int num; | |
775 | unsigned int den = rats[k].den; | |
776 | unsigned int q = i->min; | |
777 | int diff; | |
778 | num = mul(q, den); | |
779 | if (num > rats[k].num_max) | |
780 | continue; | |
781 | if (num < rats[k].num_min) | |
782 | num = rats[k].num_max; | |
783 | else { | |
784 | unsigned int r; | |
785 | r = (num - rats[k].num_min) % rats[k].num_step; | |
786 | if (r != 0) | |
787 | num += rats[k].num_step - r; | |
788 | } | |
789 | diff = num - q * den; | |
790 | if (best_num == 0 || | |
791 | diff * best_den < best_diff * den) { | |
792 | best_diff = diff; | |
793 | best_den = den; | |
794 | best_num = num; | |
795 | } | |
796 | } | |
797 | if (best_den == 0) { | |
798 | i->empty = 1; | |
799 | return -EINVAL; | |
800 | } | |
801 | t.min = div_down(best_num, best_den); | |
802 | t.openmin = !!(best_num % best_den); | |
803 | ||
804 | best_num = best_den = best_diff = 0; | |
805 | for (k = 0; k < rats_count; ++k) { | |
806 | unsigned int num; | |
807 | unsigned int den = rats[k].den; | |
808 | unsigned int q = i->max; | |
809 | int diff; | |
810 | num = mul(q, den); | |
811 | if (num < rats[k].num_min) | |
812 | continue; | |
813 | if (num > rats[k].num_max) | |
814 | num = rats[k].num_max; | |
815 | else { | |
816 | unsigned int r; | |
817 | r = (num - rats[k].num_min) % rats[k].num_step; | |
818 | if (r != 0) | |
819 | num -= r; | |
820 | } | |
821 | diff = q * den - num; | |
822 | if (best_num == 0 || | |
823 | diff * best_den < best_diff * den) { | |
824 | best_diff = diff; | |
825 | best_den = den; | |
826 | best_num = num; | |
827 | } | |
828 | } | |
829 | if (best_den == 0) { | |
830 | i->empty = 1; | |
831 | return -EINVAL; | |
832 | } | |
833 | t.max = div_up(best_num, best_den); | |
834 | t.openmax = !!(best_num % best_den); | |
835 | t.integer = 0; | |
836 | err = snd_interval_refine(i, &t); | |
837 | if (err < 0) | |
838 | return err; | |
839 | ||
840 | if (snd_interval_single(i)) { | |
841 | if (nump) | |
842 | *nump = best_num; | |
843 | if (denp) | |
844 | *denp = best_den; | |
845 | } | |
846 | return err; | |
847 | } | |
848 | ||
849 | /** | |
850 | * snd_interval_list - refine the interval value from the list | |
851 | * @i: the interval value to refine | |
852 | * @count: the number of elements in the list | |
853 | * @list: the value list | |
854 | * @mask: the bit-mask to evaluate | |
855 | * | |
856 | * Refines the interval value from the list. | |
857 | * When mask is non-zero, only the elements corresponding to bit 1 are | |
858 | * evaluated. | |
859 | * | |
860 | * Returns non-zero if the value is changed, zero if not changed. | |
861 | */ | |
877211f5 | 862 | int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask) |
1da177e4 LT |
863 | { |
864 | unsigned int k; | |
865 | int changed = 0; | |
0981a260 TI |
866 | |
867 | if (!count) { | |
868 | i->empty = 1; | |
869 | return -EINVAL; | |
870 | } | |
1da177e4 LT |
871 | for (k = 0; k < count; k++) { |
872 | if (mask && !(mask & (1 << k))) | |
873 | continue; | |
874 | if (i->min == list[k] && !i->openmin) | |
875 | goto _l1; | |
876 | if (i->min < list[k]) { | |
877 | i->min = list[k]; | |
878 | i->openmin = 0; | |
879 | changed = 1; | |
880 | goto _l1; | |
881 | } | |
882 | } | |
883 | i->empty = 1; | |
884 | return -EINVAL; | |
885 | _l1: | |
886 | for (k = count; k-- > 0;) { | |
887 | if (mask && !(mask & (1 << k))) | |
888 | continue; | |
889 | if (i->max == list[k] && !i->openmax) | |
890 | goto _l2; | |
891 | if (i->max > list[k]) { | |
892 | i->max = list[k]; | |
893 | i->openmax = 0; | |
894 | changed = 1; | |
895 | goto _l2; | |
896 | } | |
897 | } | |
898 | i->empty = 1; | |
899 | return -EINVAL; | |
900 | _l2: | |
901 | if (snd_interval_checkempty(i)) { | |
902 | i->empty = 1; | |
903 | return -EINVAL; | |
904 | } | |
905 | return changed; | |
906 | } | |
907 | ||
e88e8ae6 TI |
908 | EXPORT_SYMBOL(snd_interval_list); |
909 | ||
877211f5 | 910 | static int snd_interval_step(struct snd_interval *i, unsigned int min, unsigned int step) |
1da177e4 LT |
911 | { |
912 | unsigned int n; | |
913 | int changed = 0; | |
914 | n = (i->min - min) % step; | |
915 | if (n != 0 || i->openmin) { | |
916 | i->min += step - n; | |
917 | changed = 1; | |
918 | } | |
919 | n = (i->max - min) % step; | |
920 | if (n != 0 || i->openmax) { | |
921 | i->max -= n; | |
922 | changed = 1; | |
923 | } | |
924 | if (snd_interval_checkempty(i)) { | |
925 | i->empty = 1; | |
926 | return -EINVAL; | |
927 | } | |
928 | return changed; | |
929 | } | |
930 | ||
931 | /* Info constraints helpers */ | |
932 | ||
933 | /** | |
934 | * snd_pcm_hw_rule_add - add the hw-constraint rule | |
935 | * @runtime: the pcm runtime instance | |
936 | * @cond: condition bits | |
937 | * @var: the variable to evaluate | |
938 | * @func: the evaluation function | |
939 | * @private: the private data pointer passed to function | |
940 | * @dep: the dependent variables | |
941 | * | |
942 | * Returns zero if successful, or a negative error code on failure. | |
943 | */ | |
877211f5 | 944 | int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond, |
1da177e4 LT |
945 | int var, |
946 | snd_pcm_hw_rule_func_t func, void *private, | |
947 | int dep, ...) | |
948 | { | |
877211f5 TI |
949 | struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; |
950 | struct snd_pcm_hw_rule *c; | |
1da177e4 LT |
951 | unsigned int k; |
952 | va_list args; | |
953 | va_start(args, dep); | |
954 | if (constrs->rules_num >= constrs->rules_all) { | |
877211f5 | 955 | struct snd_pcm_hw_rule *new; |
1da177e4 LT |
956 | unsigned int new_rules = constrs->rules_all + 16; |
957 | new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL); | |
958 | if (!new) | |
959 | return -ENOMEM; | |
960 | if (constrs->rules) { | |
961 | memcpy(new, constrs->rules, | |
962 | constrs->rules_num * sizeof(*c)); | |
963 | kfree(constrs->rules); | |
964 | } | |
965 | constrs->rules = new; | |
966 | constrs->rules_all = new_rules; | |
967 | } | |
968 | c = &constrs->rules[constrs->rules_num]; | |
969 | c->cond = cond; | |
970 | c->func = func; | |
971 | c->var = var; | |
972 | c->private = private; | |
973 | k = 0; | |
974 | while (1) { | |
7eaa943c TI |
975 | if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps))) |
976 | return -EINVAL; | |
1da177e4 LT |
977 | c->deps[k++] = dep; |
978 | if (dep < 0) | |
979 | break; | |
980 | dep = va_arg(args, int); | |
981 | } | |
982 | constrs->rules_num++; | |
983 | va_end(args); | |
984 | return 0; | |
985 | } | |
986 | ||
e88e8ae6 TI |
987 | EXPORT_SYMBOL(snd_pcm_hw_rule_add); |
988 | ||
1da177e4 | 989 | /** |
1c85cc64 | 990 | * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint |
df8db936 TI |
991 | * @runtime: PCM runtime instance |
992 | * @var: hw_params variable to apply the mask | |
993 | * @mask: the bitmap mask | |
994 | * | |
1c85cc64 | 995 | * Apply the constraint of the given bitmap mask to a 32-bit mask parameter. |
1da177e4 | 996 | */ |
877211f5 | 997 | int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, |
1da177e4 LT |
998 | u_int32_t mask) |
999 | { | |
877211f5 TI |
1000 | struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; |
1001 | struct snd_mask *maskp = constrs_mask(constrs, var); | |
1da177e4 LT |
1002 | *maskp->bits &= mask; |
1003 | memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */ | |
1004 | if (*maskp->bits == 0) | |
1005 | return -EINVAL; | |
1006 | return 0; | |
1007 | } | |
1008 | ||
1009 | /** | |
1c85cc64 | 1010 | * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint |
df8db936 TI |
1011 | * @runtime: PCM runtime instance |
1012 | * @var: hw_params variable to apply the mask | |
1013 | * @mask: the 64bit bitmap mask | |
1014 | * | |
1c85cc64 | 1015 | * Apply the constraint of the given bitmap mask to a 64-bit mask parameter. |
1da177e4 | 1016 | */ |
877211f5 | 1017 | int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, |
1da177e4 LT |
1018 | u_int64_t mask) |
1019 | { | |
877211f5 TI |
1020 | struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; |
1021 | struct snd_mask *maskp = constrs_mask(constrs, var); | |
1da177e4 LT |
1022 | maskp->bits[0] &= (u_int32_t)mask; |
1023 | maskp->bits[1] &= (u_int32_t)(mask >> 32); | |
1024 | memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */ | |
1025 | if (! maskp->bits[0] && ! maskp->bits[1]) | |
1026 | return -EINVAL; | |
1027 | return 0; | |
1028 | } | |
1029 | ||
1030 | /** | |
1c85cc64 | 1031 | * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval |
df8db936 TI |
1032 | * @runtime: PCM runtime instance |
1033 | * @var: hw_params variable to apply the integer constraint | |
1034 | * | |
1035 | * Apply the constraint of integer to an interval parameter. | |
1da177e4 | 1036 | */ |
877211f5 | 1037 | int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var) |
1da177e4 | 1038 | { |
877211f5 | 1039 | struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; |
1da177e4 LT |
1040 | return snd_interval_setinteger(constrs_interval(constrs, var)); |
1041 | } | |
1042 | ||
e88e8ae6 TI |
1043 | EXPORT_SYMBOL(snd_pcm_hw_constraint_integer); |
1044 | ||
1da177e4 | 1045 | /** |
1c85cc64 | 1046 | * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval |
df8db936 TI |
1047 | * @runtime: PCM runtime instance |
1048 | * @var: hw_params variable to apply the range | |
1049 | * @min: the minimal value | |
1050 | * @max: the maximal value | |
1051 | * | |
1052 | * Apply the min/max range constraint to an interval parameter. | |
1da177e4 | 1053 | */ |
877211f5 | 1054 | int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, |
1da177e4 LT |
1055 | unsigned int min, unsigned int max) |
1056 | { | |
877211f5 TI |
1057 | struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; |
1058 | struct snd_interval t; | |
1da177e4 LT |
1059 | t.min = min; |
1060 | t.max = max; | |
1061 | t.openmin = t.openmax = 0; | |
1062 | t.integer = 0; | |
1063 | return snd_interval_refine(constrs_interval(constrs, var), &t); | |
1064 | } | |
1065 | ||
e88e8ae6 TI |
1066 | EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax); |
1067 | ||
877211f5 TI |
1068 | static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params, |
1069 | struct snd_pcm_hw_rule *rule) | |
1da177e4 | 1070 | { |
877211f5 | 1071 | struct snd_pcm_hw_constraint_list *list = rule->private; |
1da177e4 LT |
1072 | return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask); |
1073 | } | |
1074 | ||
1075 | ||
1076 | /** | |
1c85cc64 | 1077 | * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter |
df8db936 TI |
1078 | * @runtime: PCM runtime instance |
1079 | * @cond: condition bits | |
1080 | * @var: hw_params variable to apply the list constraint | |
1081 | * @l: list | |
1082 | * | |
1083 | * Apply the list of constraints to an interval parameter. | |
1da177e4 | 1084 | */ |
877211f5 | 1085 | int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime, |
1da177e4 LT |
1086 | unsigned int cond, |
1087 | snd_pcm_hw_param_t var, | |
877211f5 | 1088 | struct snd_pcm_hw_constraint_list *l) |
1da177e4 LT |
1089 | { |
1090 | return snd_pcm_hw_rule_add(runtime, cond, var, | |
1091 | snd_pcm_hw_rule_list, l, | |
1092 | var, -1); | |
1093 | } | |
1094 | ||
e88e8ae6 TI |
1095 | EXPORT_SYMBOL(snd_pcm_hw_constraint_list); |
1096 | ||
877211f5 TI |
1097 | static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params, |
1098 | struct snd_pcm_hw_rule *rule) | |
1da177e4 | 1099 | { |
877211f5 | 1100 | struct snd_pcm_hw_constraint_ratnums *r = rule->private; |
1da177e4 LT |
1101 | unsigned int num = 0, den = 0; |
1102 | int err; | |
1103 | err = snd_interval_ratnum(hw_param_interval(params, rule->var), | |
1104 | r->nrats, r->rats, &num, &den); | |
1105 | if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) { | |
1106 | params->rate_num = num; | |
1107 | params->rate_den = den; | |
1108 | } | |
1109 | return err; | |
1110 | } | |
1111 | ||
1112 | /** | |
1c85cc64 | 1113 | * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter |
df8db936 TI |
1114 | * @runtime: PCM runtime instance |
1115 | * @cond: condition bits | |
1116 | * @var: hw_params variable to apply the ratnums constraint | |
877211f5 | 1117 | * @r: struct snd_ratnums constriants |
1da177e4 | 1118 | */ |
877211f5 | 1119 | int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime, |
1da177e4 LT |
1120 | unsigned int cond, |
1121 | snd_pcm_hw_param_t var, | |
877211f5 | 1122 | struct snd_pcm_hw_constraint_ratnums *r) |
1da177e4 LT |
1123 | { |
1124 | return snd_pcm_hw_rule_add(runtime, cond, var, | |
1125 | snd_pcm_hw_rule_ratnums, r, | |
1126 | var, -1); | |
1127 | } | |
1128 | ||
e88e8ae6 TI |
1129 | EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums); |
1130 | ||
877211f5 TI |
1131 | static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params, |
1132 | struct snd_pcm_hw_rule *rule) | |
1da177e4 | 1133 | { |
877211f5 | 1134 | struct snd_pcm_hw_constraint_ratdens *r = rule->private; |
1da177e4 LT |
1135 | unsigned int num = 0, den = 0; |
1136 | int err = snd_interval_ratden(hw_param_interval(params, rule->var), | |
1137 | r->nrats, r->rats, &num, &den); | |
1138 | if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) { | |
1139 | params->rate_num = num; | |
1140 | params->rate_den = den; | |
1141 | } | |
1142 | return err; | |
1143 | } | |
1144 | ||
1145 | /** | |
1c85cc64 | 1146 | * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter |
df8db936 TI |
1147 | * @runtime: PCM runtime instance |
1148 | * @cond: condition bits | |
1149 | * @var: hw_params variable to apply the ratdens constraint | |
877211f5 | 1150 | * @r: struct snd_ratdens constriants |
1da177e4 | 1151 | */ |
877211f5 | 1152 | int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime, |
1da177e4 LT |
1153 | unsigned int cond, |
1154 | snd_pcm_hw_param_t var, | |
877211f5 | 1155 | struct snd_pcm_hw_constraint_ratdens *r) |
1da177e4 LT |
1156 | { |
1157 | return snd_pcm_hw_rule_add(runtime, cond, var, | |
1158 | snd_pcm_hw_rule_ratdens, r, | |
1159 | var, -1); | |
1160 | } | |
1161 | ||
e88e8ae6 TI |
1162 | EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens); |
1163 | ||
877211f5 TI |
1164 | static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params, |
1165 | struct snd_pcm_hw_rule *rule) | |
1da177e4 LT |
1166 | { |
1167 | unsigned int l = (unsigned long) rule->private; | |
1168 | int width = l & 0xffff; | |
1169 | unsigned int msbits = l >> 16; | |
877211f5 | 1170 | struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); |
1da177e4 LT |
1171 | if (snd_interval_single(i) && snd_interval_value(i) == width) |
1172 | params->msbits = msbits; | |
1173 | return 0; | |
1174 | } | |
1175 | ||
1176 | /** | |
1c85cc64 | 1177 | * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule |
df8db936 TI |
1178 | * @runtime: PCM runtime instance |
1179 | * @cond: condition bits | |
1180 | * @width: sample bits width | |
1181 | * @msbits: msbits width | |
1da177e4 | 1182 | */ |
877211f5 | 1183 | int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime, |
1da177e4 LT |
1184 | unsigned int cond, |
1185 | unsigned int width, | |
1186 | unsigned int msbits) | |
1187 | { | |
1188 | unsigned long l = (msbits << 16) | width; | |
1189 | return snd_pcm_hw_rule_add(runtime, cond, -1, | |
1190 | snd_pcm_hw_rule_msbits, | |
1191 | (void*) l, | |
1192 | SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); | |
1193 | } | |
1194 | ||
e88e8ae6 TI |
1195 | EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits); |
1196 | ||
877211f5 TI |
1197 | static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params, |
1198 | struct snd_pcm_hw_rule *rule) | |
1da177e4 LT |
1199 | { |
1200 | unsigned long step = (unsigned long) rule->private; | |
1201 | return snd_interval_step(hw_param_interval(params, rule->var), 0, step); | |
1202 | } | |
1203 | ||
1204 | /** | |
1c85cc64 | 1205 | * snd_pcm_hw_constraint_step - add a hw constraint step rule |
df8db936 TI |
1206 | * @runtime: PCM runtime instance |
1207 | * @cond: condition bits | |
1208 | * @var: hw_params variable to apply the step constraint | |
1209 | * @step: step size | |
1da177e4 | 1210 | */ |
877211f5 | 1211 | int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime, |
1da177e4 LT |
1212 | unsigned int cond, |
1213 | snd_pcm_hw_param_t var, | |
1214 | unsigned long step) | |
1215 | { | |
1216 | return snd_pcm_hw_rule_add(runtime, cond, var, | |
1217 | snd_pcm_hw_rule_step, (void *) step, | |
1218 | var, -1); | |
1219 | } | |
1220 | ||
e88e8ae6 TI |
1221 | EXPORT_SYMBOL(snd_pcm_hw_constraint_step); |
1222 | ||
877211f5 | 1223 | static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule) |
1da177e4 | 1224 | { |
67c39317 | 1225 | static unsigned int pow2_sizes[] = { |
1da177e4 LT |
1226 | 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7, |
1227 | 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15, | |
1228 | 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23, | |
1229 | 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30 | |
1230 | }; | |
1231 | return snd_interval_list(hw_param_interval(params, rule->var), | |
1232 | ARRAY_SIZE(pow2_sizes), pow2_sizes, 0); | |
1233 | } | |
1234 | ||
1235 | /** | |
1c85cc64 | 1236 | * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule |
df8db936 TI |
1237 | * @runtime: PCM runtime instance |
1238 | * @cond: condition bits | |
1239 | * @var: hw_params variable to apply the power-of-2 constraint | |
1da177e4 | 1240 | */ |
877211f5 | 1241 | int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime, |
1da177e4 LT |
1242 | unsigned int cond, |
1243 | snd_pcm_hw_param_t var) | |
1244 | { | |
1245 | return snd_pcm_hw_rule_add(runtime, cond, var, | |
1246 | snd_pcm_hw_rule_pow2, NULL, | |
1247 | var, -1); | |
1248 | } | |
1249 | ||
e88e8ae6 TI |
1250 | EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2); |
1251 | ||
877211f5 | 1252 | static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params, |
123992f7 | 1253 | snd_pcm_hw_param_t var) |
1da177e4 LT |
1254 | { |
1255 | if (hw_is_mask(var)) { | |
1256 | snd_mask_any(hw_param_mask(params, var)); | |
1257 | params->cmask |= 1 << var; | |
1258 | params->rmask |= 1 << var; | |
1259 | return; | |
1260 | } | |
1261 | if (hw_is_interval(var)) { | |
1262 | snd_interval_any(hw_param_interval(params, var)); | |
1263 | params->cmask |= 1 << var; | |
1264 | params->rmask |= 1 << var; | |
1265 | return; | |
1266 | } | |
1267 | snd_BUG(); | |
1268 | } | |
1269 | ||
877211f5 | 1270 | void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params) |
1da177e4 LT |
1271 | { |
1272 | unsigned int k; | |
1273 | memset(params, 0, sizeof(*params)); | |
1274 | for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) | |
1275 | _snd_pcm_hw_param_any(params, k); | |
1276 | for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) | |
1277 | _snd_pcm_hw_param_any(params, k); | |
1278 | params->info = ~0U; | |
1279 | } | |
1280 | ||
e88e8ae6 | 1281 | EXPORT_SYMBOL(_snd_pcm_hw_params_any); |
1da177e4 LT |
1282 | |
1283 | /** | |
1c85cc64 | 1284 | * snd_pcm_hw_param_value - return @params field @var value |
df8db936 TI |
1285 | * @params: the hw_params instance |
1286 | * @var: parameter to retrieve | |
1c85cc64 | 1287 | * @dir: pointer to the direction (-1,0,1) or %NULL |
1da177e4 | 1288 | * |
1c85cc64 RD |
1289 | * Return the value for field @var if it's fixed in configuration space |
1290 | * defined by @params. Return -%EINVAL otherwise. | |
1da177e4 | 1291 | */ |
e88e8ae6 TI |
1292 | int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params, |
1293 | snd_pcm_hw_param_t var, int *dir) | |
1da177e4 LT |
1294 | { |
1295 | if (hw_is_mask(var)) { | |
877211f5 | 1296 | const struct snd_mask *mask = hw_param_mask_c(params, var); |
1da177e4 LT |
1297 | if (!snd_mask_single(mask)) |
1298 | return -EINVAL; | |
1299 | if (dir) | |
1300 | *dir = 0; | |
1301 | return snd_mask_value(mask); | |
1302 | } | |
1303 | if (hw_is_interval(var)) { | |
877211f5 | 1304 | const struct snd_interval *i = hw_param_interval_c(params, var); |
1da177e4 LT |
1305 | if (!snd_interval_single(i)) |
1306 | return -EINVAL; | |
1307 | if (dir) | |
1308 | *dir = i->openmin; | |
1309 | return snd_interval_value(i); | |
1310 | } | |
1da177e4 LT |
1311 | return -EINVAL; |
1312 | } | |
1313 | ||
e88e8ae6 | 1314 | EXPORT_SYMBOL(snd_pcm_hw_param_value); |
1da177e4 | 1315 | |
877211f5 | 1316 | void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, |
1da177e4 LT |
1317 | snd_pcm_hw_param_t var) |
1318 | { | |
1319 | if (hw_is_mask(var)) { | |
1320 | snd_mask_none(hw_param_mask(params, var)); | |
1321 | params->cmask |= 1 << var; | |
1322 | params->rmask |= 1 << var; | |
1323 | } else if (hw_is_interval(var)) { | |
1324 | snd_interval_none(hw_param_interval(params, var)); | |
1325 | params->cmask |= 1 << var; | |
1326 | params->rmask |= 1 << var; | |
1327 | } else { | |
1328 | snd_BUG(); | |
1329 | } | |
1330 | } | |
1331 | ||
e88e8ae6 | 1332 | EXPORT_SYMBOL(_snd_pcm_hw_param_setempty); |
1da177e4 | 1333 | |
877211f5 | 1334 | static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params, |
123992f7 | 1335 | snd_pcm_hw_param_t var) |
1da177e4 LT |
1336 | { |
1337 | int changed; | |
1338 | if (hw_is_mask(var)) | |
1339 | changed = snd_mask_refine_first(hw_param_mask(params, var)); | |
1340 | else if (hw_is_interval(var)) | |
1341 | changed = snd_interval_refine_first(hw_param_interval(params, var)); | |
2f4ca8e5 | 1342 | else |
1da177e4 | 1343 | return -EINVAL; |
1da177e4 LT |
1344 | if (changed) { |
1345 | params->cmask |= 1 << var; | |
1346 | params->rmask |= 1 << var; | |
1347 | } | |
1348 | return changed; | |
1349 | } | |
1350 | ||
1351 | ||
1352 | /** | |
1c85cc64 | 1353 | * snd_pcm_hw_param_first - refine config space and return minimum value |
df8db936 TI |
1354 | * @pcm: PCM instance |
1355 | * @params: the hw_params instance | |
1356 | * @var: parameter to retrieve | |
1c85cc64 | 1357 | * @dir: pointer to the direction (-1,0,1) or %NULL |
1da177e4 | 1358 | * |
1c85cc64 | 1359 | * Inside configuration space defined by @params remove from @var all |
1da177e4 LT |
1360 | * values > minimum. Reduce configuration space accordingly. |
1361 | * Return the minimum. | |
1362 | */ | |
e88e8ae6 TI |
1363 | int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm, |
1364 | struct snd_pcm_hw_params *params, | |
1365 | snd_pcm_hw_param_t var, int *dir) | |
1da177e4 LT |
1366 | { |
1367 | int changed = _snd_pcm_hw_param_first(params, var); | |
1368 | if (changed < 0) | |
1369 | return changed; | |
1370 | if (params->rmask) { | |
1371 | int err = snd_pcm_hw_refine(pcm, params); | |
7eaa943c TI |
1372 | if (snd_BUG_ON(err < 0)) |
1373 | return err; | |
1da177e4 LT |
1374 | } |
1375 | return snd_pcm_hw_param_value(params, var, dir); | |
1376 | } | |
1377 | ||
e88e8ae6 TI |
1378 | EXPORT_SYMBOL(snd_pcm_hw_param_first); |
1379 | ||
877211f5 | 1380 | static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params, |
123992f7 | 1381 | snd_pcm_hw_param_t var) |
1da177e4 LT |
1382 | { |
1383 | int changed; | |
1384 | if (hw_is_mask(var)) | |
1385 | changed = snd_mask_refine_last(hw_param_mask(params, var)); | |
1386 | else if (hw_is_interval(var)) | |
1387 | changed = snd_interval_refine_last(hw_param_interval(params, var)); | |
2f4ca8e5 | 1388 | else |
1da177e4 | 1389 | return -EINVAL; |
1da177e4 LT |
1390 | if (changed) { |
1391 | params->cmask |= 1 << var; | |
1392 | params->rmask |= 1 << var; | |
1393 | } | |
1394 | return changed; | |
1395 | } | |
1396 | ||
1397 | ||
1398 | /** | |
1c85cc64 | 1399 | * snd_pcm_hw_param_last - refine config space and return maximum value |
df8db936 TI |
1400 | * @pcm: PCM instance |
1401 | * @params: the hw_params instance | |
1402 | * @var: parameter to retrieve | |
1c85cc64 | 1403 | * @dir: pointer to the direction (-1,0,1) or %NULL |
1da177e4 | 1404 | * |
1c85cc64 | 1405 | * Inside configuration space defined by @params remove from @var all |
1da177e4 LT |
1406 | * values < maximum. Reduce configuration space accordingly. |
1407 | * Return the maximum. | |
1408 | */ | |
e88e8ae6 TI |
1409 | int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm, |
1410 | struct snd_pcm_hw_params *params, | |
1411 | snd_pcm_hw_param_t var, int *dir) | |
1da177e4 LT |
1412 | { |
1413 | int changed = _snd_pcm_hw_param_last(params, var); | |
1414 | if (changed < 0) | |
1415 | return changed; | |
1416 | if (params->rmask) { | |
1417 | int err = snd_pcm_hw_refine(pcm, params); | |
7eaa943c TI |
1418 | if (snd_BUG_ON(err < 0)) |
1419 | return err; | |
1da177e4 LT |
1420 | } |
1421 | return snd_pcm_hw_param_value(params, var, dir); | |
1422 | } | |
1423 | ||
e88e8ae6 | 1424 | EXPORT_SYMBOL(snd_pcm_hw_param_last); |
1da177e4 LT |
1425 | |
1426 | /** | |
1c85cc64 | 1427 | * snd_pcm_hw_param_choose - choose a configuration defined by @params |
df8db936 TI |
1428 | * @pcm: PCM instance |
1429 | * @params: the hw_params instance | |
1da177e4 | 1430 | * |
1c85cc64 | 1431 | * Choose one configuration from configuration space defined by @params. |
1da177e4 LT |
1432 | * The configuration chosen is that obtained fixing in this order: |
1433 | * first access, first format, first subformat, min channels, | |
1434 | * min rate, min period time, max buffer size, min tick time | |
1435 | */ | |
2f4ca8e5 TI |
1436 | int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm, |
1437 | struct snd_pcm_hw_params *params) | |
1da177e4 | 1438 | { |
2f4ca8e5 TI |
1439 | static int vars[] = { |
1440 | SNDRV_PCM_HW_PARAM_ACCESS, | |
1441 | SNDRV_PCM_HW_PARAM_FORMAT, | |
1442 | SNDRV_PCM_HW_PARAM_SUBFORMAT, | |
1443 | SNDRV_PCM_HW_PARAM_CHANNELS, | |
1444 | SNDRV_PCM_HW_PARAM_RATE, | |
1445 | SNDRV_PCM_HW_PARAM_PERIOD_TIME, | |
1446 | SNDRV_PCM_HW_PARAM_BUFFER_SIZE, | |
1447 | SNDRV_PCM_HW_PARAM_TICK_TIME, | |
1448 | -1 | |
1449 | }; | |
1450 | int err, *v; | |
1da177e4 | 1451 | |
2f4ca8e5 TI |
1452 | for (v = vars; *v != -1; v++) { |
1453 | if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE) | |
1454 | err = snd_pcm_hw_param_first(pcm, params, *v, NULL); | |
1455 | else | |
1456 | err = snd_pcm_hw_param_last(pcm, params, *v, NULL); | |
7eaa943c TI |
1457 | if (snd_BUG_ON(err < 0)) |
1458 | return err; | |
2f4ca8e5 | 1459 | } |
1da177e4 LT |
1460 | return 0; |
1461 | } | |
1462 | ||
877211f5 | 1463 | static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream, |
1da177e4 LT |
1464 | void *arg) |
1465 | { | |
877211f5 | 1466 | struct snd_pcm_runtime *runtime = substream->runtime; |
1da177e4 LT |
1467 | unsigned long flags; |
1468 | snd_pcm_stream_lock_irqsave(substream, flags); | |
1469 | if (snd_pcm_running(substream) && | |
1470 | snd_pcm_update_hw_ptr(substream) >= 0) | |
1471 | runtime->status->hw_ptr %= runtime->buffer_size; | |
1472 | else | |
1473 | runtime->status->hw_ptr = 0; | |
bbf6ad13 | 1474 | runtime->hw_ptr_jiffies = jiffies; |
1da177e4 LT |
1475 | snd_pcm_stream_unlock_irqrestore(substream, flags); |
1476 | return 0; | |
1477 | } | |
1478 | ||
877211f5 | 1479 | static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream, |
1da177e4 LT |
1480 | void *arg) |
1481 | { | |
877211f5 TI |
1482 | struct snd_pcm_channel_info *info = arg; |
1483 | struct snd_pcm_runtime *runtime = substream->runtime; | |
1da177e4 LT |
1484 | int width; |
1485 | if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) { | |
1486 | info->offset = -1; | |
1487 | return 0; | |
1488 | } | |
1489 | width = snd_pcm_format_physical_width(runtime->format); | |
1490 | if (width < 0) | |
1491 | return width; | |
1492 | info->offset = 0; | |
1493 | switch (runtime->access) { | |
1494 | case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED: | |
1495 | case SNDRV_PCM_ACCESS_RW_INTERLEAVED: | |
1496 | info->first = info->channel * width; | |
1497 | info->step = runtime->channels * width; | |
1498 | break; | |
1499 | case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED: | |
1500 | case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED: | |
1501 | { | |
1502 | size_t size = runtime->dma_bytes / runtime->channels; | |
1503 | info->first = info->channel * size * 8; | |
1504 | info->step = width; | |
1505 | break; | |
1506 | } | |
1507 | default: | |
1508 | snd_BUG(); | |
1509 | break; | |
1510 | } | |
1511 | return 0; | |
1512 | } | |
1513 | ||
1514 | /** | |
1515 | * snd_pcm_lib_ioctl - a generic PCM ioctl callback | |
1516 | * @substream: the pcm substream instance | |
1517 | * @cmd: ioctl command | |
1518 | * @arg: ioctl argument | |
1519 | * | |
1520 | * Processes the generic ioctl commands for PCM. | |
1521 | * Can be passed as the ioctl callback for PCM ops. | |
1522 | * | |
1523 | * Returns zero if successful, or a negative error code on failure. | |
1524 | */ | |
877211f5 | 1525 | int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream, |
1da177e4 LT |
1526 | unsigned int cmd, void *arg) |
1527 | { | |
1528 | switch (cmd) { | |
1529 | case SNDRV_PCM_IOCTL1_INFO: | |
1530 | return 0; | |
1531 | case SNDRV_PCM_IOCTL1_RESET: | |
1532 | return snd_pcm_lib_ioctl_reset(substream, arg); | |
1533 | case SNDRV_PCM_IOCTL1_CHANNEL_INFO: | |
1534 | return snd_pcm_lib_ioctl_channel_info(substream, arg); | |
1535 | } | |
1536 | return -ENXIO; | |
1537 | } | |
1538 | ||
e88e8ae6 TI |
1539 | EXPORT_SYMBOL(snd_pcm_lib_ioctl); |
1540 | ||
1da177e4 LT |
1541 | /** |
1542 | * snd_pcm_period_elapsed - update the pcm status for the next period | |
1543 | * @substream: the pcm substream instance | |
1544 | * | |
1545 | * This function is called from the interrupt handler when the | |
1546 | * PCM has processed the period size. It will update the current | |
31e8960b | 1547 | * pointer, wake up sleepers, etc. |
1da177e4 LT |
1548 | * |
1549 | * Even if more than one periods have elapsed since the last call, you | |
1550 | * have to call this only once. | |
1551 | */ | |
877211f5 | 1552 | void snd_pcm_period_elapsed(struct snd_pcm_substream *substream) |
1da177e4 | 1553 | { |
877211f5 | 1554 | struct snd_pcm_runtime *runtime; |
1da177e4 LT |
1555 | unsigned long flags; |
1556 | ||
7eaa943c TI |
1557 | if (PCM_RUNTIME_CHECK(substream)) |
1558 | return; | |
1da177e4 | 1559 | runtime = substream->runtime; |
1da177e4 LT |
1560 | |
1561 | if (runtime->transfer_ack_begin) | |
1562 | runtime->transfer_ack_begin(substream); | |
1563 | ||
1564 | snd_pcm_stream_lock_irqsave(substream, flags); | |
1565 | if (!snd_pcm_running(substream) || | |
1566 | snd_pcm_update_hw_ptr_interrupt(substream) < 0) | |
1567 | goto _end; | |
1568 | ||
1569 | if (substream->timer_running) | |
1570 | snd_timer_interrupt(substream->timer, 1); | |
1da177e4 LT |
1571 | _end: |
1572 | snd_pcm_stream_unlock_irqrestore(substream, flags); | |
1573 | if (runtime->transfer_ack_end) | |
1574 | runtime->transfer_ack_end(substream); | |
1575 | kill_fasync(&runtime->fasync, SIGIO, POLL_IN); | |
1576 | } | |
1577 | ||
e88e8ae6 TI |
1578 | EXPORT_SYMBOL(snd_pcm_period_elapsed); |
1579 | ||
13075510 TI |
1580 | /* |
1581 | * Wait until avail_min data becomes available | |
1582 | * Returns a negative error code if any error occurs during operation. | |
1583 | * The available space is stored on availp. When err = 0 and avail = 0 | |
1584 | * on the capture stream, it indicates the stream is in DRAINING state. | |
1585 | */ | |
1586 | static int wait_for_avail_min(struct snd_pcm_substream *substream, | |
1587 | snd_pcm_uframes_t *availp) | |
1588 | { | |
1589 | struct snd_pcm_runtime *runtime = substream->runtime; | |
1590 | int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK; | |
1591 | wait_queue_t wait; | |
1592 | int err = 0; | |
1593 | snd_pcm_uframes_t avail = 0; | |
1594 | long tout; | |
1595 | ||
1596 | init_waitqueue_entry(&wait, current); | |
1597 | add_wait_queue(&runtime->sleep, &wait); | |
1598 | for (;;) { | |
1599 | if (signal_pending(current)) { | |
1600 | err = -ERESTARTSYS; | |
1601 | break; | |
1602 | } | |
1603 | set_current_state(TASK_INTERRUPTIBLE); | |
1604 | snd_pcm_stream_unlock_irq(substream); | |
1605 | tout = schedule_timeout(msecs_to_jiffies(10000)); | |
1606 | snd_pcm_stream_lock_irq(substream); | |
1607 | switch (runtime->status->state) { | |
1608 | case SNDRV_PCM_STATE_SUSPENDED: | |
1609 | err = -ESTRPIPE; | |
1610 | goto _endloop; | |
1611 | case SNDRV_PCM_STATE_XRUN: | |
1612 | err = -EPIPE; | |
1613 | goto _endloop; | |
1614 | case SNDRV_PCM_STATE_DRAINING: | |
1615 | if (is_playback) | |
1616 | err = -EPIPE; | |
1617 | else | |
1618 | avail = 0; /* indicate draining */ | |
1619 | goto _endloop; | |
1620 | case SNDRV_PCM_STATE_OPEN: | |
1621 | case SNDRV_PCM_STATE_SETUP: | |
1622 | case SNDRV_PCM_STATE_DISCONNECTED: | |
1623 | err = -EBADFD; | |
1624 | goto _endloop; | |
1625 | } | |
1626 | if (!tout) { | |
1627 | snd_printd("%s write error (DMA or IRQ trouble?)\n", | |
1628 | is_playback ? "playback" : "capture"); | |
1629 | err = -EIO; | |
1630 | break; | |
1631 | } | |
1632 | if (is_playback) | |
1633 | avail = snd_pcm_playback_avail(runtime); | |
1634 | else | |
1635 | avail = snd_pcm_capture_avail(runtime); | |
1636 | if (avail >= runtime->control->avail_min) | |
1637 | break; | |
1638 | } | |
1639 | _endloop: | |
1640 | remove_wait_queue(&runtime->sleep, &wait); | |
1641 | *availp = avail; | |
1642 | return err; | |
1643 | } | |
1644 | ||
877211f5 | 1645 | static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream, |
1da177e4 LT |
1646 | unsigned int hwoff, |
1647 | unsigned long data, unsigned int off, | |
1648 | snd_pcm_uframes_t frames) | |
1649 | { | |
877211f5 | 1650 | struct snd_pcm_runtime *runtime = substream->runtime; |
1da177e4 LT |
1651 | int err; |
1652 | char __user *buf = (char __user *) data + frames_to_bytes(runtime, off); | |
1653 | if (substream->ops->copy) { | |
1654 | if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0) | |
1655 | return err; | |
1656 | } else { | |
1657 | char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff); | |
1da177e4 LT |
1658 | if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames))) |
1659 | return -EFAULT; | |
1660 | } | |
1661 | return 0; | |
1662 | } | |
1663 | ||
877211f5 | 1664 | typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff, |
1da177e4 LT |
1665 | unsigned long data, unsigned int off, |
1666 | snd_pcm_uframes_t size); | |
1667 | ||
877211f5 | 1668 | static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream, |
1da177e4 LT |
1669 | unsigned long data, |
1670 | snd_pcm_uframes_t size, | |
1671 | int nonblock, | |
1672 | transfer_f transfer) | |
1673 | { | |
877211f5 | 1674 | struct snd_pcm_runtime *runtime = substream->runtime; |
1da177e4 LT |
1675 | snd_pcm_uframes_t xfer = 0; |
1676 | snd_pcm_uframes_t offset = 0; | |
1677 | int err = 0; | |
1678 | ||
1679 | if (size == 0) | |
1680 | return 0; | |
1da177e4 LT |
1681 | |
1682 | snd_pcm_stream_lock_irq(substream); | |
1683 | switch (runtime->status->state) { | |
1684 | case SNDRV_PCM_STATE_PREPARED: | |
1685 | case SNDRV_PCM_STATE_RUNNING: | |
1686 | case SNDRV_PCM_STATE_PAUSED: | |
1687 | break; | |
1688 | case SNDRV_PCM_STATE_XRUN: | |
1689 | err = -EPIPE; | |
1690 | goto _end_unlock; | |
1691 | case SNDRV_PCM_STATE_SUSPENDED: | |
1692 | err = -ESTRPIPE; | |
1693 | goto _end_unlock; | |
1694 | default: | |
1695 | err = -EBADFD; | |
1696 | goto _end_unlock; | |
1697 | } | |
1698 | ||
1699 | while (size > 0) { | |
1700 | snd_pcm_uframes_t frames, appl_ptr, appl_ofs; | |
1701 | snd_pcm_uframes_t avail; | |
1702 | snd_pcm_uframes_t cont; | |
31e8960b | 1703 | if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) |
1da177e4 LT |
1704 | snd_pcm_update_hw_ptr(substream); |
1705 | avail = snd_pcm_playback_avail(runtime); | |
13075510 | 1706 | if (!avail) { |
1da177e4 LT |
1707 | if (nonblock) { |
1708 | err = -EAGAIN; | |
1709 | goto _end_unlock; | |
1710 | } | |
13075510 TI |
1711 | err = wait_for_avail_min(substream, &avail); |
1712 | if (err < 0) | |
443feb88 | 1713 | goto _end_unlock; |
1da177e4 | 1714 | } |
1da177e4 LT |
1715 | frames = size > avail ? avail : size; |
1716 | cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size; | |
1717 | if (frames > cont) | |
1718 | frames = cont; | |
7eaa943c TI |
1719 | if (snd_BUG_ON(!frames)) { |
1720 | snd_pcm_stream_unlock_irq(substream); | |
1721 | return -EINVAL; | |
1722 | } | |
1da177e4 LT |
1723 | appl_ptr = runtime->control->appl_ptr; |
1724 | appl_ofs = appl_ptr % runtime->buffer_size; | |
1725 | snd_pcm_stream_unlock_irq(substream); | |
1726 | if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0) | |
1727 | goto _end; | |
1728 | snd_pcm_stream_lock_irq(substream); | |
1729 | switch (runtime->status->state) { | |
1730 | case SNDRV_PCM_STATE_XRUN: | |
1731 | err = -EPIPE; | |
1732 | goto _end_unlock; | |
1733 | case SNDRV_PCM_STATE_SUSPENDED: | |
1734 | err = -ESTRPIPE; | |
1735 | goto _end_unlock; | |
1736 | default: | |
1737 | break; | |
1738 | } | |
1739 | appl_ptr += frames; | |
1740 | if (appl_ptr >= runtime->boundary) | |
1741 | appl_ptr -= runtime->boundary; | |
1742 | runtime->control->appl_ptr = appl_ptr; | |
1743 | if (substream->ops->ack) | |
1744 | substream->ops->ack(substream); | |
1745 | ||
1746 | offset += frames; | |
1747 | size -= frames; | |
1748 | xfer += frames; | |
1749 | if (runtime->status->state == SNDRV_PCM_STATE_PREPARED && | |
1750 | snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) { | |
1751 | err = snd_pcm_start(substream); | |
1752 | if (err < 0) | |
1753 | goto _end_unlock; | |
1754 | } | |
1da177e4 LT |
1755 | } |
1756 | _end_unlock: | |
1757 | snd_pcm_stream_unlock_irq(substream); | |
1758 | _end: | |
1759 | return xfer > 0 ? (snd_pcm_sframes_t)xfer : err; | |
1760 | } | |
1761 | ||
7eaa943c TI |
1762 | /* sanity-check for read/write methods */ |
1763 | static int pcm_sanity_check(struct snd_pcm_substream *substream) | |
1da177e4 | 1764 | { |
877211f5 | 1765 | struct snd_pcm_runtime *runtime; |
7eaa943c TI |
1766 | if (PCM_RUNTIME_CHECK(substream)) |
1767 | return -ENXIO; | |
1da177e4 | 1768 | runtime = substream->runtime; |
7eaa943c TI |
1769 | if (snd_BUG_ON(!substream->ops->copy && !runtime->dma_area)) |
1770 | return -EINVAL; | |
1da177e4 LT |
1771 | if (runtime->status->state == SNDRV_PCM_STATE_OPEN) |
1772 | return -EBADFD; | |
7eaa943c TI |
1773 | return 0; |
1774 | } | |
1775 | ||
1776 | snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, const void __user *buf, snd_pcm_uframes_t size) | |
1777 | { | |
1778 | struct snd_pcm_runtime *runtime; | |
1779 | int nonblock; | |
1780 | int err; | |
1da177e4 | 1781 | |
7eaa943c TI |
1782 | err = pcm_sanity_check(substream); |
1783 | if (err < 0) | |
1784 | return err; | |
1785 | runtime = substream->runtime; | |
0df63e44 | 1786 | nonblock = !!(substream->f_flags & O_NONBLOCK); |
1da177e4 LT |
1787 | |
1788 | if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED && | |
1789 | runtime->channels > 1) | |
1790 | return -EINVAL; | |
1791 | return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock, | |
1792 | snd_pcm_lib_write_transfer); | |
1793 | } | |
1794 | ||
e88e8ae6 TI |
1795 | EXPORT_SYMBOL(snd_pcm_lib_write); |
1796 | ||
877211f5 | 1797 | static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream, |
1da177e4 LT |
1798 | unsigned int hwoff, |
1799 | unsigned long data, unsigned int off, | |
1800 | snd_pcm_uframes_t frames) | |
1801 | { | |
877211f5 | 1802 | struct snd_pcm_runtime *runtime = substream->runtime; |
1da177e4 LT |
1803 | int err; |
1804 | void __user **bufs = (void __user **)data; | |
1805 | int channels = runtime->channels; | |
1806 | int c; | |
1807 | if (substream->ops->copy) { | |
7eaa943c TI |
1808 | if (snd_BUG_ON(!substream->ops->silence)) |
1809 | return -EINVAL; | |
1da177e4 LT |
1810 | for (c = 0; c < channels; ++c, ++bufs) { |
1811 | if (*bufs == NULL) { | |
1812 | if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0) | |
1813 | return err; | |
1814 | } else { | |
1815 | char __user *buf = *bufs + samples_to_bytes(runtime, off); | |
1816 | if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0) | |
1817 | return err; | |
1818 | } | |
1819 | } | |
1820 | } else { | |
1821 | /* default transfer behaviour */ | |
1822 | size_t dma_csize = runtime->dma_bytes / channels; | |
1da177e4 LT |
1823 | for (c = 0; c < channels; ++c, ++bufs) { |
1824 | char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff); | |
1825 | if (*bufs == NULL) { | |
1826 | snd_pcm_format_set_silence(runtime->format, hwbuf, frames); | |
1827 | } else { | |
1828 | char __user *buf = *bufs + samples_to_bytes(runtime, off); | |
1829 | if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames))) | |
1830 | return -EFAULT; | |
1831 | } | |
1832 | } | |
1833 | } | |
1834 | return 0; | |
1835 | } | |
1836 | ||
877211f5 | 1837 | snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream, |
1da177e4 LT |
1838 | void __user **bufs, |
1839 | snd_pcm_uframes_t frames) | |
1840 | { | |
877211f5 | 1841 | struct snd_pcm_runtime *runtime; |
1da177e4 | 1842 | int nonblock; |
7eaa943c | 1843 | int err; |
1da177e4 | 1844 | |
7eaa943c TI |
1845 | err = pcm_sanity_check(substream); |
1846 | if (err < 0) | |
1847 | return err; | |
1da177e4 | 1848 | runtime = substream->runtime; |
0df63e44 | 1849 | nonblock = !!(substream->f_flags & O_NONBLOCK); |
1da177e4 LT |
1850 | |
1851 | if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) | |
1852 | return -EINVAL; | |
1853 | return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames, | |
1854 | nonblock, snd_pcm_lib_writev_transfer); | |
1855 | } | |
1856 | ||
e88e8ae6 TI |
1857 | EXPORT_SYMBOL(snd_pcm_lib_writev); |
1858 | ||
877211f5 | 1859 | static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream, |
1da177e4 LT |
1860 | unsigned int hwoff, |
1861 | unsigned long data, unsigned int off, | |
1862 | snd_pcm_uframes_t frames) | |
1863 | { | |
877211f5 | 1864 | struct snd_pcm_runtime *runtime = substream->runtime; |
1da177e4 LT |
1865 | int err; |
1866 | char __user *buf = (char __user *) data + frames_to_bytes(runtime, off); | |
1867 | if (substream->ops->copy) { | |
1868 | if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0) | |
1869 | return err; | |
1870 | } else { | |
1871 | char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff); | |
1da177e4 LT |
1872 | if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames))) |
1873 | return -EFAULT; | |
1874 | } | |
1875 | return 0; | |
1876 | } | |
1877 | ||
877211f5 | 1878 | static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream, |
1da177e4 LT |
1879 | unsigned long data, |
1880 | snd_pcm_uframes_t size, | |
1881 | int nonblock, | |
1882 | transfer_f transfer) | |
1883 | { | |
877211f5 | 1884 | struct snd_pcm_runtime *runtime = substream->runtime; |
1da177e4 LT |
1885 | snd_pcm_uframes_t xfer = 0; |
1886 | snd_pcm_uframes_t offset = 0; | |
1887 | int err = 0; | |
1888 | ||
1889 | if (size == 0) | |
1890 | return 0; | |
1da177e4 LT |
1891 | |
1892 | snd_pcm_stream_lock_irq(substream); | |
1893 | switch (runtime->status->state) { | |
1894 | case SNDRV_PCM_STATE_PREPARED: | |
1895 | if (size >= runtime->start_threshold) { | |
1896 | err = snd_pcm_start(substream); | |
1897 | if (err < 0) | |
1898 | goto _end_unlock; | |
1899 | } | |
1900 | break; | |
1901 | case SNDRV_PCM_STATE_DRAINING: | |
1902 | case SNDRV_PCM_STATE_RUNNING: | |
1903 | case SNDRV_PCM_STATE_PAUSED: | |
1904 | break; | |
1905 | case SNDRV_PCM_STATE_XRUN: | |
1906 | err = -EPIPE; | |
1907 | goto _end_unlock; | |
1908 | case SNDRV_PCM_STATE_SUSPENDED: | |
1909 | err = -ESTRPIPE; | |
1910 | goto _end_unlock; | |
1911 | default: | |
1912 | err = -EBADFD; | |
1913 | goto _end_unlock; | |
1914 | } | |
1915 | ||
1916 | while (size > 0) { | |
1917 | snd_pcm_uframes_t frames, appl_ptr, appl_ofs; | |
1918 | snd_pcm_uframes_t avail; | |
1919 | snd_pcm_uframes_t cont; | |
31e8960b | 1920 | if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) |
1da177e4 | 1921 | snd_pcm_update_hw_ptr(substream); |
1da177e4 | 1922 | avail = snd_pcm_capture_avail(runtime); |
13075510 TI |
1923 | if (!avail) { |
1924 | if (runtime->status->state == | |
1925 | SNDRV_PCM_STATE_DRAINING) { | |
1926 | snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); | |
1da177e4 LT |
1927 | goto _end_unlock; |
1928 | } | |
1da177e4 LT |
1929 | if (nonblock) { |
1930 | err = -EAGAIN; | |
1931 | goto _end_unlock; | |
1932 | } | |
13075510 TI |
1933 | err = wait_for_avail_min(substream, &avail); |
1934 | if (err < 0) | |
443feb88 | 1935 | goto _end_unlock; |
13075510 TI |
1936 | if (!avail) |
1937 | continue; /* draining */ | |
1da177e4 | 1938 | } |
1da177e4 LT |
1939 | frames = size > avail ? avail : size; |
1940 | cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size; | |
1941 | if (frames > cont) | |
1942 | frames = cont; | |
7eaa943c TI |
1943 | if (snd_BUG_ON(!frames)) { |
1944 | snd_pcm_stream_unlock_irq(substream); | |
1945 | return -EINVAL; | |
1946 | } | |
1da177e4 LT |
1947 | appl_ptr = runtime->control->appl_ptr; |
1948 | appl_ofs = appl_ptr % runtime->buffer_size; | |
1949 | snd_pcm_stream_unlock_irq(substream); | |
1950 | if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0) | |
1951 | goto _end; | |
1952 | snd_pcm_stream_lock_irq(substream); | |
1953 | switch (runtime->status->state) { | |
1954 | case SNDRV_PCM_STATE_XRUN: | |
1955 | err = -EPIPE; | |
1956 | goto _end_unlock; | |
1957 | case SNDRV_PCM_STATE_SUSPENDED: | |
1958 | err = -ESTRPIPE; | |
1959 | goto _end_unlock; | |
1960 | default: | |
1961 | break; | |
1962 | } | |
1963 | appl_ptr += frames; | |
1964 | if (appl_ptr >= runtime->boundary) | |
1965 | appl_ptr -= runtime->boundary; | |
1966 | runtime->control->appl_ptr = appl_ptr; | |
1967 | if (substream->ops->ack) | |
1968 | substream->ops->ack(substream); | |
1969 | ||
1970 | offset += frames; | |
1971 | size -= frames; | |
1972 | xfer += frames; | |
1da177e4 LT |
1973 | } |
1974 | _end_unlock: | |
1975 | snd_pcm_stream_unlock_irq(substream); | |
1976 | _end: | |
1977 | return xfer > 0 ? (snd_pcm_sframes_t)xfer : err; | |
1978 | } | |
1979 | ||
877211f5 | 1980 | snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, void __user *buf, snd_pcm_uframes_t size) |
1da177e4 | 1981 | { |
877211f5 | 1982 | struct snd_pcm_runtime *runtime; |
1da177e4 | 1983 | int nonblock; |
7eaa943c | 1984 | int err; |
1da177e4 | 1985 | |
7eaa943c TI |
1986 | err = pcm_sanity_check(substream); |
1987 | if (err < 0) | |
1988 | return err; | |
1da177e4 | 1989 | runtime = substream->runtime; |
0df63e44 | 1990 | nonblock = !!(substream->f_flags & O_NONBLOCK); |
1da177e4 LT |
1991 | if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED) |
1992 | return -EINVAL; | |
1993 | return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer); | |
1994 | } | |
1995 | ||
e88e8ae6 TI |
1996 | EXPORT_SYMBOL(snd_pcm_lib_read); |
1997 | ||
877211f5 | 1998 | static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream, |
1da177e4 LT |
1999 | unsigned int hwoff, |
2000 | unsigned long data, unsigned int off, | |
2001 | snd_pcm_uframes_t frames) | |
2002 | { | |
877211f5 | 2003 | struct snd_pcm_runtime *runtime = substream->runtime; |
1da177e4 LT |
2004 | int err; |
2005 | void __user **bufs = (void __user **)data; | |
2006 | int channels = runtime->channels; | |
2007 | int c; | |
2008 | if (substream->ops->copy) { | |
2009 | for (c = 0; c < channels; ++c, ++bufs) { | |
2010 | char __user *buf; | |
2011 | if (*bufs == NULL) | |
2012 | continue; | |
2013 | buf = *bufs + samples_to_bytes(runtime, off); | |
2014 | if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0) | |
2015 | return err; | |
2016 | } | |
2017 | } else { | |
2018 | snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels; | |
1da177e4 LT |
2019 | for (c = 0; c < channels; ++c, ++bufs) { |
2020 | char *hwbuf; | |
2021 | char __user *buf; | |
2022 | if (*bufs == NULL) | |
2023 | continue; | |
2024 | ||
2025 | hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff); | |
2026 | buf = *bufs + samples_to_bytes(runtime, off); | |
2027 | if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames))) | |
2028 | return -EFAULT; | |
2029 | } | |
2030 | } | |
2031 | return 0; | |
2032 | } | |
2033 | ||
877211f5 | 2034 | snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream, |
1da177e4 LT |
2035 | void __user **bufs, |
2036 | snd_pcm_uframes_t frames) | |
2037 | { | |
877211f5 | 2038 | struct snd_pcm_runtime *runtime; |
1da177e4 | 2039 | int nonblock; |
7eaa943c | 2040 | int err; |
1da177e4 | 2041 | |
7eaa943c TI |
2042 | err = pcm_sanity_check(substream); |
2043 | if (err < 0) | |
2044 | return err; | |
1da177e4 | 2045 | runtime = substream->runtime; |
1da177e4 LT |
2046 | if (runtime->status->state == SNDRV_PCM_STATE_OPEN) |
2047 | return -EBADFD; | |
2048 | ||
0df63e44 | 2049 | nonblock = !!(substream->f_flags & O_NONBLOCK); |
1da177e4 LT |
2050 | if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) |
2051 | return -EINVAL; | |
2052 | return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer); | |
2053 | } | |
2054 | ||
1da177e4 | 2055 | EXPORT_SYMBOL(snd_pcm_lib_readv); |