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> | |
3f7440a6 | 25 | #include <linux/math64.h> |
1da177e4 LT |
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 | } | |
7eaa943c TI |
89 | if (snd_BUG_ON(frames > runtime->buffer_size)) |
90 | return; | |
1da177e4 LT |
91 | if (frames == 0) |
92 | return; | |
9a826ddb | 93 | ofs = runtime->silence_start % runtime->buffer_size; |
1da177e4 LT |
94 | while (frames > 0) { |
95 | transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames; | |
96 | if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || | |
97 | runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) { | |
98 | if (substream->ops->silence) { | |
99 | int err; | |
100 | err = substream->ops->silence(substream, -1, ofs, transfer); | |
7eaa943c | 101 | snd_BUG_ON(err < 0); |
1da177e4 LT |
102 | } else { |
103 | char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs); | |
104 | snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels); | |
105 | } | |
106 | } else { | |
107 | unsigned int c; | |
108 | unsigned int channels = runtime->channels; | |
109 | if (substream->ops->silence) { | |
110 | for (c = 0; c < channels; ++c) { | |
111 | int err; | |
112 | err = substream->ops->silence(substream, c, ofs, transfer); | |
7eaa943c | 113 | snd_BUG_ON(err < 0); |
1da177e4 LT |
114 | } |
115 | } else { | |
116 | size_t dma_csize = runtime->dma_bytes / channels; | |
117 | for (c = 0; c < channels; ++c) { | |
118 | char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs); | |
119 | snd_pcm_format_set_silence(runtime->format, hwbuf, transfer); | |
120 | } | |
121 | } | |
122 | } | |
123 | runtime->silence_filled += transfer; | |
124 | frames -= transfer; | |
125 | ofs = 0; | |
126 | } | |
127 | } | |
128 | ||
ed3da3d9 | 129 | #ifdef CONFIG_SND_PCM_XRUN_DEBUG |
c62a01ad | 130 | #define xrun_debug(substream, mask) ((substream)->pstr->xrun_debug & (mask)) |
ed3da3d9 | 131 | #else |
c62a01ad | 132 | #define xrun_debug(substream, mask) 0 |
ed3da3d9 TI |
133 | #endif |
134 | ||
c62a01ad JK |
135 | #define dump_stack_on_xrun(substream) do { \ |
136 | if (xrun_debug(substream, 2)) \ | |
137 | dump_stack(); \ | |
ed3da3d9 TI |
138 | } while (0) |
139 | ||
c0070110 TI |
140 | static void pcm_debug_name(struct snd_pcm_substream *substream, |
141 | char *name, size_t len) | |
142 | { | |
143 | snprintf(name, len, "pcmC%dD%d%c:%d", | |
144 | substream->pcm->card->number, | |
145 | substream->pcm->device, | |
146 | substream->stream ? 'c' : 'p', | |
147 | substream->number); | |
148 | } | |
149 | ||
877211f5 | 150 | static void xrun(struct snd_pcm_substream *substream) |
1da177e4 | 151 | { |
13f040f9 JK |
152 | struct snd_pcm_runtime *runtime = substream->runtime; |
153 | ||
154 | if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) | |
155 | snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp); | |
1da177e4 | 156 | snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); |
c62a01ad | 157 | if (xrun_debug(substream, 1)) { |
c0070110 TI |
158 | char name[16]; |
159 | pcm_debug_name(substream, name, sizeof(name)); | |
160 | snd_printd(KERN_DEBUG "XRUN: %s\n", name); | |
ed3da3d9 | 161 | dump_stack_on_xrun(substream); |
1da177e4 | 162 | } |
1da177e4 LT |
163 | } |
164 | ||
98204646 TI |
165 | static snd_pcm_uframes_t |
166 | snd_pcm_update_hw_ptr_pos(struct snd_pcm_substream *substream, | |
167 | struct snd_pcm_runtime *runtime) | |
1da177e4 LT |
168 | { |
169 | snd_pcm_uframes_t pos; | |
170 | ||
171 | pos = substream->ops->pointer(substream); | |
172 | if (pos == SNDRV_PCM_POS_XRUN) | |
173 | return pos; /* XRUN */ | |
1da177e4 | 174 | if (pos >= runtime->buffer_size) { |
5f513e11 | 175 | if (printk_ratelimit()) { |
c0070110 TI |
176 | char name[16]; |
177 | pcm_debug_name(substream, name, sizeof(name)); | |
178 | snd_printd(KERN_ERR "BUG: %s, pos = 0x%lx, " | |
5f513e11 | 179 | "buffer size = 0x%lx, period size = 0x%lx\n", |
c0070110 | 180 | name, pos, runtime->buffer_size, |
5f513e11 TI |
181 | runtime->period_size); |
182 | } | |
183 | pos = 0; | |
7c22f1aa | 184 | } |
1da177e4 LT |
185 | pos -= pos % runtime->min_align; |
186 | return pos; | |
187 | } | |
188 | ||
98204646 TI |
189 | static int snd_pcm_update_hw_ptr_post(struct snd_pcm_substream *substream, |
190 | struct snd_pcm_runtime *runtime) | |
1da177e4 LT |
191 | { |
192 | snd_pcm_uframes_t avail; | |
193 | ||
194 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
195 | avail = snd_pcm_playback_avail(runtime); | |
196 | else | |
197 | avail = snd_pcm_capture_avail(runtime); | |
198 | if (avail > runtime->avail_max) | |
199 | runtime->avail_max = avail; | |
200 | if (avail >= runtime->stop_threshold) { | |
201 | if (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING) | |
202 | snd_pcm_drain_done(substream); | |
203 | else | |
204 | xrun(substream); | |
205 | return -EPIPE; | |
206 | } | |
207 | if (avail >= runtime->control->avail_min) | |
208 | wake_up(&runtime->sleep); | |
209 | return 0; | |
210 | } | |
211 | ||
ed3da3d9 TI |
212 | #define hw_ptr_error(substream, fmt, args...) \ |
213 | do { \ | |
c62a01ad | 214 | if (xrun_debug(substream, 1)) { \ |
ed3da3d9 | 215 | if (printk_ratelimit()) { \ |
cad377ac | 216 | snd_printd("PCM: " fmt, ##args); \ |
ed3da3d9 TI |
217 | } \ |
218 | dump_stack_on_xrun(substream); \ | |
219 | } \ | |
220 | } while (0) | |
221 | ||
98204646 | 222 | static int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream *substream) |
1da177e4 | 223 | { |
877211f5 | 224 | struct snd_pcm_runtime *runtime = substream->runtime; |
1da177e4 | 225 | snd_pcm_uframes_t pos; |
bbf6ad13 JK |
226 | snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_ptr_interrupt, hw_base; |
227 | snd_pcm_sframes_t hdelta, delta; | |
228 | unsigned long jdelta; | |
1da177e4 | 229 | |
bbf6ad13 | 230 | old_hw_ptr = runtime->status->hw_ptr; |
1da177e4 LT |
231 | pos = snd_pcm_update_hw_ptr_pos(substream, runtime); |
232 | if (pos == SNDRV_PCM_POS_XRUN) { | |
233 | xrun(substream); | |
234 | return -EPIPE; | |
235 | } | |
ed3da3d9 TI |
236 | hw_base = runtime->hw_ptr_base; |
237 | new_hw_ptr = hw_base + pos; | |
1da177e4 | 238 | hw_ptr_interrupt = runtime->hw_ptr_interrupt + runtime->period_size; |
ed3da3d9 | 239 | delta = new_hw_ptr - hw_ptr_interrupt; |
ded652f7 | 240 | if (hw_ptr_interrupt >= runtime->boundary) { |
8b22d943 TI |
241 | hw_ptr_interrupt -= runtime->boundary; |
242 | if (hw_base < runtime->boundary / 2) | |
243 | /* hw_base was already lapped; recalc delta */ | |
ded652f7 TI |
244 | delta = new_hw_ptr - hw_ptr_interrupt; |
245 | } | |
ed3da3d9 TI |
246 | if (delta < 0) { |
247 | delta += runtime->buffer_size; | |
248 | if (delta < 0) { | |
249 | hw_ptr_error(substream, | |
250 | "Unexpected hw_pointer value " | |
251 | "(stream=%i, pos=%ld, intr_ptr=%ld)\n", | |
252 | substream->stream, (long)pos, | |
253 | (long)hw_ptr_interrupt); | |
254 | /* rebase to interrupt position */ | |
255 | hw_base = new_hw_ptr = hw_ptr_interrupt; | |
ded652f7 TI |
256 | /* align hw_base to buffer_size */ |
257 | hw_base -= hw_base % runtime->buffer_size; | |
ed3da3d9 TI |
258 | delta = 0; |
259 | } else { | |
260 | hw_base += runtime->buffer_size; | |
8b22d943 | 261 | if (hw_base >= runtime->boundary) |
ed3da3d9 TI |
262 | hw_base = 0; |
263 | new_hw_ptr = hw_base + pos; | |
1da177e4 | 264 | } |
1da177e4 | 265 | } |
c87d9732 TI |
266 | |
267 | /* Do jiffies check only in xrun_debug mode */ | |
c62a01ad | 268 | if (!xrun_debug(substream, 4)) |
c87d9732 TI |
269 | goto no_jiffies_check; |
270 | ||
3e5b5016 TI |
271 | /* Skip the jiffies check for hardwares with BATCH flag. |
272 | * Such hardware usually just increases the position at each IRQ, | |
273 | * thus it can't give any strange position. | |
274 | */ | |
275 | if (runtime->hw.info & SNDRV_PCM_INFO_BATCH) | |
276 | goto no_jiffies_check; | |
bbf6ad13 | 277 | hdelta = new_hw_ptr - old_hw_ptr; |
a4444da3 JK |
278 | if (hdelta < runtime->delay) |
279 | goto no_jiffies_check; | |
280 | hdelta -= runtime->delay; | |
bbf6ad13 JK |
281 | jdelta = jiffies - runtime->hw_ptr_jiffies; |
282 | if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) { | |
283 | delta = jdelta / | |
284 | (((runtime->period_size * HZ) / runtime->rate) | |
285 | + HZ/100); | |
286 | hw_ptr_error(substream, | |
287 | "hw_ptr skipping! [Q] " | |
288 | "(pos=%ld, delta=%ld, period=%ld, " | |
289 | "jdelta=%lu/%lu/%lu)\n", | |
290 | (long)pos, (long)hdelta, | |
291 | (long)runtime->period_size, jdelta, | |
292 | ((hdelta * HZ) / runtime->rate), delta); | |
293 | hw_ptr_interrupt = runtime->hw_ptr_interrupt + | |
294 | runtime->period_size * delta; | |
295 | if (hw_ptr_interrupt >= runtime->boundary) | |
296 | hw_ptr_interrupt -= runtime->boundary; | |
297 | /* rebase to interrupt position */ | |
298 | hw_base = new_hw_ptr = hw_ptr_interrupt; | |
299 | /* align hw_base to buffer_size */ | |
300 | hw_base -= hw_base % runtime->buffer_size; | |
301 | delta = 0; | |
302 | } | |
3e5b5016 | 303 | no_jiffies_check: |
bbf6ad13 | 304 | if (delta > runtime->period_size + runtime->period_size / 2) { |
ed3da3d9 TI |
305 | hw_ptr_error(substream, |
306 | "Lost interrupts? " | |
307 | "(stream=%i, delta=%ld, intr_ptr=%ld)\n", | |
308 | substream->stream, (long)delta, | |
309 | (long)hw_ptr_interrupt); | |
310 | /* rebase hw_ptr_interrupt */ | |
311 | hw_ptr_interrupt = | |
312 | new_hw_ptr - new_hw_ptr % runtime->period_size; | |
313 | } | |
ab1863fc TI |
314 | runtime->hw_ptr_interrupt = hw_ptr_interrupt; |
315 | ||
1da177e4 LT |
316 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && |
317 | runtime->silence_size > 0) | |
318 | snd_pcm_playback_silence(substream, new_hw_ptr); | |
319 | ||
13f040f9 JK |
320 | if (runtime->status->hw_ptr == new_hw_ptr) |
321 | return 0; | |
322 | ||
ed3da3d9 | 323 | runtime->hw_ptr_base = hw_base; |
1da177e4 | 324 | runtime->status->hw_ptr = new_hw_ptr; |
bbf6ad13 | 325 | runtime->hw_ptr_jiffies = jiffies; |
13f040f9 JK |
326 | if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) |
327 | snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp); | |
1da177e4 LT |
328 | |
329 | return snd_pcm_update_hw_ptr_post(substream, runtime); | |
330 | } | |
331 | ||
332 | /* CAUTION: call it with irq disabled */ | |
877211f5 | 333 | int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream) |
1da177e4 | 334 | { |
877211f5 | 335 | struct snd_pcm_runtime *runtime = substream->runtime; |
1da177e4 | 336 | snd_pcm_uframes_t pos; |
ed3da3d9 | 337 | snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base; |
1da177e4 | 338 | snd_pcm_sframes_t delta; |
bbf6ad13 | 339 | unsigned long jdelta; |
1da177e4 LT |
340 | |
341 | old_hw_ptr = runtime->status->hw_ptr; | |
342 | pos = snd_pcm_update_hw_ptr_pos(substream, runtime); | |
343 | if (pos == SNDRV_PCM_POS_XRUN) { | |
344 | xrun(substream); | |
345 | return -EPIPE; | |
346 | } | |
ed3da3d9 TI |
347 | hw_base = runtime->hw_ptr_base; |
348 | new_hw_ptr = hw_base + pos; | |
1da177e4 | 349 | |
ed3da3d9 | 350 | delta = new_hw_ptr - old_hw_ptr; |
bbf6ad13 | 351 | jdelta = jiffies - runtime->hw_ptr_jiffies; |
ed3da3d9 TI |
352 | if (delta < 0) { |
353 | delta += runtime->buffer_size; | |
354 | if (delta < 0) { | |
355 | hw_ptr_error(substream, | |
356 | "Unexpected hw_pointer value [2] " | |
bbf6ad13 | 357 | "(stream=%i, pos=%ld, old_ptr=%ld, jdelta=%li)\n", |
ed3da3d9 | 358 | substream->stream, (long)pos, |
bbf6ad13 | 359 | (long)old_hw_ptr, jdelta); |
1da177e4 LT |
360 | return 0; |
361 | } | |
ed3da3d9 | 362 | hw_base += runtime->buffer_size; |
8b22d943 | 363 | if (hw_base >= runtime->boundary) |
ed3da3d9 TI |
364 | hw_base = 0; |
365 | new_hw_ptr = hw_base + pos; | |
366 | } | |
c87d9732 | 367 | /* Do jiffies check only in xrun_debug mode */ |
a4444da3 JK |
368 | if (!xrun_debug(substream, 4)) |
369 | goto no_jiffies_check; | |
370 | if (delta < runtime->delay) | |
371 | goto no_jiffies_check; | |
372 | delta -= runtime->delay; | |
373 | if (((delta * HZ) / runtime->rate) > jdelta + HZ/100) { | |
ed3da3d9 TI |
374 | hw_ptr_error(substream, |
375 | "hw_ptr skipping! " | |
bbf6ad13 | 376 | "(pos=%ld, delta=%ld, period=%ld, jdelta=%lu/%lu)\n", |
ed3da3d9 | 377 | (long)pos, (long)delta, |
bbf6ad13 JK |
378 | (long)runtime->period_size, jdelta, |
379 | ((delta * HZ) / runtime->rate)); | |
ed3da3d9 | 380 | return 0; |
1da177e4 | 381 | } |
a4444da3 | 382 | no_jiffies_check: |
1da177e4 LT |
383 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && |
384 | runtime->silence_size > 0) | |
385 | snd_pcm_playback_silence(substream, new_hw_ptr); | |
386 | ||
d86bf923 | 387 | if (runtime->status->hw_ptr == new_hw_ptr) |
13f040f9 JK |
388 | return 0; |
389 | ||
ed3da3d9 | 390 | runtime->hw_ptr_base = hw_base; |
1da177e4 | 391 | runtime->status->hw_ptr = new_hw_ptr; |
bbf6ad13 | 392 | runtime->hw_ptr_jiffies = jiffies; |
13f040f9 JK |
393 | if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) |
394 | snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp); | |
1da177e4 LT |
395 | |
396 | return snd_pcm_update_hw_ptr_post(substream, runtime); | |
397 | } | |
398 | ||
399 | /** | |
400 | * snd_pcm_set_ops - set the PCM operators | |
401 | * @pcm: the pcm instance | |
402 | * @direction: stream direction, SNDRV_PCM_STREAM_XXX | |
403 | * @ops: the operator table | |
404 | * | |
405 | * Sets the given PCM operators to the pcm instance. | |
406 | */ | |
877211f5 | 407 | void snd_pcm_set_ops(struct snd_pcm *pcm, int direction, struct snd_pcm_ops *ops) |
1da177e4 | 408 | { |
877211f5 TI |
409 | struct snd_pcm_str *stream = &pcm->streams[direction]; |
410 | struct snd_pcm_substream *substream; | |
1da177e4 LT |
411 | |
412 | for (substream = stream->substream; substream != NULL; substream = substream->next) | |
413 | substream->ops = ops; | |
414 | } | |
415 | ||
e88e8ae6 | 416 | EXPORT_SYMBOL(snd_pcm_set_ops); |
1da177e4 LT |
417 | |
418 | /** | |
419 | * snd_pcm_sync - set the PCM sync id | |
420 | * @substream: the pcm substream | |
421 | * | |
422 | * Sets the PCM sync identifier for the card. | |
423 | */ | |
877211f5 | 424 | void snd_pcm_set_sync(struct snd_pcm_substream *substream) |
1da177e4 | 425 | { |
877211f5 | 426 | struct snd_pcm_runtime *runtime = substream->runtime; |
1da177e4 LT |
427 | |
428 | runtime->sync.id32[0] = substream->pcm->card->number; | |
429 | runtime->sync.id32[1] = -1; | |
430 | runtime->sync.id32[2] = -1; | |
431 | runtime->sync.id32[3] = -1; | |
432 | } | |
433 | ||
e88e8ae6 TI |
434 | EXPORT_SYMBOL(snd_pcm_set_sync); |
435 | ||
1da177e4 LT |
436 | /* |
437 | * Standard ioctl routine | |
438 | */ | |
439 | ||
1da177e4 LT |
440 | static inline unsigned int div32(unsigned int a, unsigned int b, |
441 | unsigned int *r) | |
442 | { | |
443 | if (b == 0) { | |
444 | *r = 0; | |
445 | return UINT_MAX; | |
446 | } | |
447 | *r = a % b; | |
448 | return a / b; | |
449 | } | |
450 | ||
451 | static inline unsigned int div_down(unsigned int a, unsigned int b) | |
452 | { | |
453 | if (b == 0) | |
454 | return UINT_MAX; | |
455 | return a / b; | |
456 | } | |
457 | ||
458 | static inline unsigned int div_up(unsigned int a, unsigned int b) | |
459 | { | |
460 | unsigned int r; | |
461 | unsigned int q; | |
462 | if (b == 0) | |
463 | return UINT_MAX; | |
464 | q = div32(a, b, &r); | |
465 | if (r) | |
466 | ++q; | |
467 | return q; | |
468 | } | |
469 | ||
470 | static inline unsigned int mul(unsigned int a, unsigned int b) | |
471 | { | |
472 | if (a == 0) | |
473 | return 0; | |
474 | if (div_down(UINT_MAX, a) < b) | |
475 | return UINT_MAX; | |
476 | return a * b; | |
477 | } | |
478 | ||
479 | static inline unsigned int muldiv32(unsigned int a, unsigned int b, | |
480 | unsigned int c, unsigned int *r) | |
481 | { | |
482 | u_int64_t n = (u_int64_t) a * b; | |
483 | if (c == 0) { | |
7eaa943c | 484 | snd_BUG_ON(!n); |
1da177e4 LT |
485 | *r = 0; |
486 | return UINT_MAX; | |
487 | } | |
3f7440a6 | 488 | n = div_u64_rem(n, c, r); |
1da177e4 LT |
489 | if (n >= UINT_MAX) { |
490 | *r = 0; | |
491 | return UINT_MAX; | |
492 | } | |
493 | return n; | |
494 | } | |
495 | ||
1da177e4 LT |
496 | /** |
497 | * snd_interval_refine - refine the interval value of configurator | |
498 | * @i: the interval value to refine | |
499 | * @v: the interval value to refer to | |
500 | * | |
501 | * Refines the interval value with the reference value. | |
502 | * The interval is changed to the range satisfying both intervals. | |
503 | * The interval status (min, max, integer, etc.) are evaluated. | |
504 | * | |
505 | * Returns non-zero if the value is changed, zero if not changed. | |
506 | */ | |
877211f5 | 507 | int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v) |
1da177e4 LT |
508 | { |
509 | int changed = 0; | |
7eaa943c TI |
510 | if (snd_BUG_ON(snd_interval_empty(i))) |
511 | return -EINVAL; | |
1da177e4 LT |
512 | if (i->min < v->min) { |
513 | i->min = v->min; | |
514 | i->openmin = v->openmin; | |
515 | changed = 1; | |
516 | } else if (i->min == v->min && !i->openmin && v->openmin) { | |
517 | i->openmin = 1; | |
518 | changed = 1; | |
519 | } | |
520 | if (i->max > v->max) { | |
521 | i->max = v->max; | |
522 | i->openmax = v->openmax; | |
523 | changed = 1; | |
524 | } else if (i->max == v->max && !i->openmax && v->openmax) { | |
525 | i->openmax = 1; | |
526 | changed = 1; | |
527 | } | |
528 | if (!i->integer && v->integer) { | |
529 | i->integer = 1; | |
530 | changed = 1; | |
531 | } | |
532 | if (i->integer) { | |
533 | if (i->openmin) { | |
534 | i->min++; | |
535 | i->openmin = 0; | |
536 | } | |
537 | if (i->openmax) { | |
538 | i->max--; | |
539 | i->openmax = 0; | |
540 | } | |
541 | } else if (!i->openmin && !i->openmax && i->min == i->max) | |
542 | i->integer = 1; | |
543 | if (snd_interval_checkempty(i)) { | |
544 | snd_interval_none(i); | |
545 | return -EINVAL; | |
546 | } | |
547 | return changed; | |
548 | } | |
549 | ||
e88e8ae6 TI |
550 | EXPORT_SYMBOL(snd_interval_refine); |
551 | ||
877211f5 | 552 | static int snd_interval_refine_first(struct snd_interval *i) |
1da177e4 | 553 | { |
7eaa943c TI |
554 | if (snd_BUG_ON(snd_interval_empty(i))) |
555 | return -EINVAL; | |
1da177e4 LT |
556 | if (snd_interval_single(i)) |
557 | return 0; | |
558 | i->max = i->min; | |
559 | i->openmax = i->openmin; | |
560 | if (i->openmax) | |
561 | i->max++; | |
562 | return 1; | |
563 | } | |
564 | ||
877211f5 | 565 | static int snd_interval_refine_last(struct snd_interval *i) |
1da177e4 | 566 | { |
7eaa943c TI |
567 | if (snd_BUG_ON(snd_interval_empty(i))) |
568 | return -EINVAL; | |
1da177e4 LT |
569 | if (snd_interval_single(i)) |
570 | return 0; | |
571 | i->min = i->max; | |
572 | i->openmin = i->openmax; | |
573 | if (i->openmin) | |
574 | i->min--; | |
575 | return 1; | |
576 | } | |
577 | ||
877211f5 | 578 | void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c) |
1da177e4 LT |
579 | { |
580 | if (a->empty || b->empty) { | |
581 | snd_interval_none(c); | |
582 | return; | |
583 | } | |
584 | c->empty = 0; | |
585 | c->min = mul(a->min, b->min); | |
586 | c->openmin = (a->openmin || b->openmin); | |
587 | c->max = mul(a->max, b->max); | |
588 | c->openmax = (a->openmax || b->openmax); | |
589 | c->integer = (a->integer && b->integer); | |
590 | } | |
591 | ||
592 | /** | |
593 | * snd_interval_div - refine the interval value with division | |
df8db936 TI |
594 | * @a: dividend |
595 | * @b: divisor | |
596 | * @c: quotient | |
1da177e4 LT |
597 | * |
598 | * c = a / b | |
599 | * | |
600 | * Returns non-zero if the value is changed, zero if not changed. | |
601 | */ | |
877211f5 | 602 | void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c) |
1da177e4 LT |
603 | { |
604 | unsigned int r; | |
605 | if (a->empty || b->empty) { | |
606 | snd_interval_none(c); | |
607 | return; | |
608 | } | |
609 | c->empty = 0; | |
610 | c->min = div32(a->min, b->max, &r); | |
611 | c->openmin = (r || a->openmin || b->openmax); | |
612 | if (b->min > 0) { | |
613 | c->max = div32(a->max, b->min, &r); | |
614 | if (r) { | |
615 | c->max++; | |
616 | c->openmax = 1; | |
617 | } else | |
618 | c->openmax = (a->openmax || b->openmin); | |
619 | } else { | |
620 | c->max = UINT_MAX; | |
621 | c->openmax = 0; | |
622 | } | |
623 | c->integer = 0; | |
624 | } | |
625 | ||
626 | /** | |
627 | * snd_interval_muldivk - refine the interval value | |
df8db936 TI |
628 | * @a: dividend 1 |
629 | * @b: dividend 2 | |
630 | * @k: divisor (as integer) | |
631 | * @c: result | |
632 | * | |
1da177e4 LT |
633 | * c = a * b / k |
634 | * | |
635 | * Returns non-zero if the value is changed, zero if not changed. | |
636 | */ | |
877211f5 TI |
637 | void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b, |
638 | unsigned int k, struct snd_interval *c) | |
1da177e4 LT |
639 | { |
640 | unsigned int r; | |
641 | if (a->empty || b->empty) { | |
642 | snd_interval_none(c); | |
643 | return; | |
644 | } | |
645 | c->empty = 0; | |
646 | c->min = muldiv32(a->min, b->min, k, &r); | |
647 | c->openmin = (r || a->openmin || b->openmin); | |
648 | c->max = muldiv32(a->max, b->max, k, &r); | |
649 | if (r) { | |
650 | c->max++; | |
651 | c->openmax = 1; | |
652 | } else | |
653 | c->openmax = (a->openmax || b->openmax); | |
654 | c->integer = 0; | |
655 | } | |
656 | ||
657 | /** | |
658 | * snd_interval_mulkdiv - refine the interval value | |
df8db936 TI |
659 | * @a: dividend 1 |
660 | * @k: dividend 2 (as integer) | |
661 | * @b: divisor | |
662 | * @c: result | |
1da177e4 LT |
663 | * |
664 | * c = a * k / b | |
665 | * | |
666 | * Returns non-zero if the value is changed, zero if not changed. | |
667 | */ | |
877211f5 TI |
668 | void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k, |
669 | const struct snd_interval *b, struct snd_interval *c) | |
1da177e4 LT |
670 | { |
671 | unsigned int r; | |
672 | if (a->empty || b->empty) { | |
673 | snd_interval_none(c); | |
674 | return; | |
675 | } | |
676 | c->empty = 0; | |
677 | c->min = muldiv32(a->min, k, b->max, &r); | |
678 | c->openmin = (r || a->openmin || b->openmax); | |
679 | if (b->min > 0) { | |
680 | c->max = muldiv32(a->max, k, b->min, &r); | |
681 | if (r) { | |
682 | c->max++; | |
683 | c->openmax = 1; | |
684 | } else | |
685 | c->openmax = (a->openmax || b->openmin); | |
686 | } else { | |
687 | c->max = UINT_MAX; | |
688 | c->openmax = 0; | |
689 | } | |
690 | c->integer = 0; | |
691 | } | |
692 | ||
1da177e4 LT |
693 | /* ---- */ |
694 | ||
695 | ||
696 | /** | |
697 | * snd_interval_ratnum - refine the interval value | |
df8db936 TI |
698 | * @i: interval to refine |
699 | * @rats_count: number of ratnum_t | |
700 | * @rats: ratnum_t array | |
701 | * @nump: pointer to store the resultant numerator | |
702 | * @denp: pointer to store the resultant denominator | |
1da177e4 LT |
703 | * |
704 | * Returns non-zero if the value is changed, zero if not changed. | |
705 | */ | |
877211f5 TI |
706 | int snd_interval_ratnum(struct snd_interval *i, |
707 | unsigned int rats_count, struct snd_ratnum *rats, | |
708 | unsigned int *nump, unsigned int *denp) | |
1da177e4 LT |
709 | { |
710 | unsigned int best_num, best_diff, best_den; | |
711 | unsigned int k; | |
877211f5 | 712 | struct snd_interval t; |
1da177e4 LT |
713 | int err; |
714 | ||
715 | best_num = best_den = best_diff = 0; | |
716 | for (k = 0; k < rats_count; ++k) { | |
717 | unsigned int num = rats[k].num; | |
718 | unsigned int den; | |
719 | unsigned int q = i->min; | |
720 | int diff; | |
721 | if (q == 0) | |
722 | q = 1; | |
723 | den = div_down(num, q); | |
724 | if (den < rats[k].den_min) | |
725 | continue; | |
726 | if (den > rats[k].den_max) | |
727 | den = rats[k].den_max; | |
728 | else { | |
729 | unsigned int r; | |
730 | r = (den - rats[k].den_min) % rats[k].den_step; | |
731 | if (r != 0) | |
732 | den -= r; | |
733 | } | |
734 | diff = num - q * den; | |
735 | if (best_num == 0 || | |
736 | diff * best_den < best_diff * den) { | |
737 | best_diff = diff; | |
738 | best_den = den; | |
739 | best_num = num; | |
740 | } | |
741 | } | |
742 | if (best_den == 0) { | |
743 | i->empty = 1; | |
744 | return -EINVAL; | |
745 | } | |
746 | t.min = div_down(best_num, best_den); | |
747 | t.openmin = !!(best_num % best_den); | |
748 | ||
749 | best_num = best_den = best_diff = 0; | |
750 | for (k = 0; k < rats_count; ++k) { | |
751 | unsigned int num = rats[k].num; | |
752 | unsigned int den; | |
753 | unsigned int q = i->max; | |
754 | int diff; | |
755 | if (q == 0) { | |
756 | i->empty = 1; | |
757 | return -EINVAL; | |
758 | } | |
759 | den = div_up(num, q); | |
760 | if (den > rats[k].den_max) | |
761 | continue; | |
762 | if (den < rats[k].den_min) | |
763 | den = rats[k].den_min; | |
764 | else { | |
765 | unsigned int r; | |
766 | r = (den - rats[k].den_min) % rats[k].den_step; | |
767 | if (r != 0) | |
768 | den += rats[k].den_step - r; | |
769 | } | |
770 | diff = q * den - num; | |
771 | if (best_num == 0 || | |
772 | diff * best_den < best_diff * den) { | |
773 | best_diff = diff; | |
774 | best_den = den; | |
775 | best_num = num; | |
776 | } | |
777 | } | |
778 | if (best_den == 0) { | |
779 | i->empty = 1; | |
780 | return -EINVAL; | |
781 | } | |
782 | t.max = div_up(best_num, best_den); | |
783 | t.openmax = !!(best_num % best_den); | |
784 | t.integer = 0; | |
785 | err = snd_interval_refine(i, &t); | |
786 | if (err < 0) | |
787 | return err; | |
788 | ||
789 | if (snd_interval_single(i)) { | |
790 | if (nump) | |
791 | *nump = best_num; | |
792 | if (denp) | |
793 | *denp = best_den; | |
794 | } | |
795 | return err; | |
796 | } | |
797 | ||
e88e8ae6 TI |
798 | EXPORT_SYMBOL(snd_interval_ratnum); |
799 | ||
1da177e4 LT |
800 | /** |
801 | * snd_interval_ratden - refine the interval value | |
df8db936 | 802 | * @i: interval to refine |
877211f5 TI |
803 | * @rats_count: number of struct ratden |
804 | * @rats: struct ratden array | |
df8db936 TI |
805 | * @nump: pointer to store the resultant numerator |
806 | * @denp: pointer to store the resultant denominator | |
1da177e4 LT |
807 | * |
808 | * Returns non-zero if the value is changed, zero if not changed. | |
809 | */ | |
877211f5 TI |
810 | static int snd_interval_ratden(struct snd_interval *i, |
811 | unsigned int rats_count, struct snd_ratden *rats, | |
1da177e4 LT |
812 | unsigned int *nump, unsigned int *denp) |
813 | { | |
814 | unsigned int best_num, best_diff, best_den; | |
815 | unsigned int k; | |
877211f5 | 816 | struct snd_interval t; |
1da177e4 LT |
817 | int err; |
818 | ||
819 | best_num = best_den = best_diff = 0; | |
820 | for (k = 0; k < rats_count; ++k) { | |
821 | unsigned int num; | |
822 | unsigned int den = rats[k].den; | |
823 | unsigned int q = i->min; | |
824 | int diff; | |
825 | num = mul(q, den); | |
826 | if (num > rats[k].num_max) | |
827 | continue; | |
828 | if (num < rats[k].num_min) | |
829 | num = rats[k].num_max; | |
830 | else { | |
831 | unsigned int r; | |
832 | r = (num - rats[k].num_min) % rats[k].num_step; | |
833 | if (r != 0) | |
834 | num += rats[k].num_step - r; | |
835 | } | |
836 | diff = num - q * den; | |
837 | if (best_num == 0 || | |
838 | diff * best_den < best_diff * den) { | |
839 | best_diff = diff; | |
840 | best_den = den; | |
841 | best_num = num; | |
842 | } | |
843 | } | |
844 | if (best_den == 0) { | |
845 | i->empty = 1; | |
846 | return -EINVAL; | |
847 | } | |
848 | t.min = div_down(best_num, best_den); | |
849 | t.openmin = !!(best_num % best_den); | |
850 | ||
851 | best_num = best_den = best_diff = 0; | |
852 | for (k = 0; k < rats_count; ++k) { | |
853 | unsigned int num; | |
854 | unsigned int den = rats[k].den; | |
855 | unsigned int q = i->max; | |
856 | int diff; | |
857 | num = mul(q, den); | |
858 | if (num < rats[k].num_min) | |
859 | continue; | |
860 | if (num > rats[k].num_max) | |
861 | num = rats[k].num_max; | |
862 | else { | |
863 | unsigned int r; | |
864 | r = (num - rats[k].num_min) % rats[k].num_step; | |
865 | if (r != 0) | |
866 | num -= r; | |
867 | } | |
868 | diff = q * den - num; | |
869 | if (best_num == 0 || | |
870 | diff * best_den < best_diff * den) { | |
871 | best_diff = diff; | |
872 | best_den = den; | |
873 | best_num = num; | |
874 | } | |
875 | } | |
876 | if (best_den == 0) { | |
877 | i->empty = 1; | |
878 | return -EINVAL; | |
879 | } | |
880 | t.max = div_up(best_num, best_den); | |
881 | t.openmax = !!(best_num % best_den); | |
882 | t.integer = 0; | |
883 | err = snd_interval_refine(i, &t); | |
884 | if (err < 0) | |
885 | return err; | |
886 | ||
887 | if (snd_interval_single(i)) { | |
888 | if (nump) | |
889 | *nump = best_num; | |
890 | if (denp) | |
891 | *denp = best_den; | |
892 | } | |
893 | return err; | |
894 | } | |
895 | ||
896 | /** | |
897 | * snd_interval_list - refine the interval value from the list | |
898 | * @i: the interval value to refine | |
899 | * @count: the number of elements in the list | |
900 | * @list: the value list | |
901 | * @mask: the bit-mask to evaluate | |
902 | * | |
903 | * Refines the interval value from the list. | |
904 | * When mask is non-zero, only the elements corresponding to bit 1 are | |
905 | * evaluated. | |
906 | * | |
907 | * Returns non-zero if the value is changed, zero if not changed. | |
908 | */ | |
877211f5 | 909 | int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask) |
1da177e4 LT |
910 | { |
911 | unsigned int k; | |
b1ddaf68 | 912 | struct snd_interval list_range; |
0981a260 TI |
913 | |
914 | if (!count) { | |
915 | i->empty = 1; | |
916 | return -EINVAL; | |
917 | } | |
b1ddaf68 CL |
918 | snd_interval_any(&list_range); |
919 | list_range.min = UINT_MAX; | |
920 | list_range.max = 0; | |
1da177e4 LT |
921 | for (k = 0; k < count; k++) { |
922 | if (mask && !(mask & (1 << k))) | |
923 | continue; | |
b1ddaf68 | 924 | if (!snd_interval_test(i, list[k])) |
1da177e4 | 925 | continue; |
b1ddaf68 CL |
926 | list_range.min = min(list_range.min, list[k]); |
927 | list_range.max = max(list_range.max, list[k]); | |
1da177e4 | 928 | } |
b1ddaf68 | 929 | return snd_interval_refine(i, &list_range); |
1da177e4 LT |
930 | } |
931 | ||
e88e8ae6 TI |
932 | EXPORT_SYMBOL(snd_interval_list); |
933 | ||
877211f5 | 934 | static int snd_interval_step(struct snd_interval *i, unsigned int min, unsigned int step) |
1da177e4 LT |
935 | { |
936 | unsigned int n; | |
937 | int changed = 0; | |
938 | n = (i->min - min) % step; | |
939 | if (n != 0 || i->openmin) { | |
940 | i->min += step - n; | |
941 | changed = 1; | |
942 | } | |
943 | n = (i->max - min) % step; | |
944 | if (n != 0 || i->openmax) { | |
945 | i->max -= n; | |
946 | changed = 1; | |
947 | } | |
948 | if (snd_interval_checkempty(i)) { | |
949 | i->empty = 1; | |
950 | return -EINVAL; | |
951 | } | |
952 | return changed; | |
953 | } | |
954 | ||
955 | /* Info constraints helpers */ | |
956 | ||
957 | /** | |
958 | * snd_pcm_hw_rule_add - add the hw-constraint rule | |
959 | * @runtime: the pcm runtime instance | |
960 | * @cond: condition bits | |
961 | * @var: the variable to evaluate | |
962 | * @func: the evaluation function | |
963 | * @private: the private data pointer passed to function | |
964 | * @dep: the dependent variables | |
965 | * | |
966 | * Returns zero if successful, or a negative error code on failure. | |
967 | */ | |
877211f5 | 968 | int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond, |
1da177e4 LT |
969 | int var, |
970 | snd_pcm_hw_rule_func_t func, void *private, | |
971 | int dep, ...) | |
972 | { | |
877211f5 TI |
973 | struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; |
974 | struct snd_pcm_hw_rule *c; | |
1da177e4 LT |
975 | unsigned int k; |
976 | va_list args; | |
977 | va_start(args, dep); | |
978 | if (constrs->rules_num >= constrs->rules_all) { | |
877211f5 | 979 | struct snd_pcm_hw_rule *new; |
1da177e4 LT |
980 | unsigned int new_rules = constrs->rules_all + 16; |
981 | new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL); | |
982 | if (!new) | |
983 | return -ENOMEM; | |
984 | if (constrs->rules) { | |
985 | memcpy(new, constrs->rules, | |
986 | constrs->rules_num * sizeof(*c)); | |
987 | kfree(constrs->rules); | |
988 | } | |
989 | constrs->rules = new; | |
990 | constrs->rules_all = new_rules; | |
991 | } | |
992 | c = &constrs->rules[constrs->rules_num]; | |
993 | c->cond = cond; | |
994 | c->func = func; | |
995 | c->var = var; | |
996 | c->private = private; | |
997 | k = 0; | |
998 | while (1) { | |
7eaa943c TI |
999 | if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps))) |
1000 | return -EINVAL; | |
1da177e4 LT |
1001 | c->deps[k++] = dep; |
1002 | if (dep < 0) | |
1003 | break; | |
1004 | dep = va_arg(args, int); | |
1005 | } | |
1006 | constrs->rules_num++; | |
1007 | va_end(args); | |
1008 | return 0; | |
1009 | } | |
1010 | ||
e88e8ae6 TI |
1011 | EXPORT_SYMBOL(snd_pcm_hw_rule_add); |
1012 | ||
1da177e4 | 1013 | /** |
1c85cc64 | 1014 | * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint |
df8db936 TI |
1015 | * @runtime: PCM runtime instance |
1016 | * @var: hw_params variable to apply the mask | |
1017 | * @mask: the bitmap mask | |
1018 | * | |
1c85cc64 | 1019 | * Apply the constraint of the given bitmap mask to a 32-bit mask parameter. |
1da177e4 | 1020 | */ |
877211f5 | 1021 | int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, |
1da177e4 LT |
1022 | u_int32_t mask) |
1023 | { | |
877211f5 TI |
1024 | struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; |
1025 | struct snd_mask *maskp = constrs_mask(constrs, var); | |
1da177e4 LT |
1026 | *maskp->bits &= mask; |
1027 | memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */ | |
1028 | if (*maskp->bits == 0) | |
1029 | return -EINVAL; | |
1030 | return 0; | |
1031 | } | |
1032 | ||
1033 | /** | |
1c85cc64 | 1034 | * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint |
df8db936 TI |
1035 | * @runtime: PCM runtime instance |
1036 | * @var: hw_params variable to apply the mask | |
1037 | * @mask: the 64bit bitmap mask | |
1038 | * | |
1c85cc64 | 1039 | * Apply the constraint of the given bitmap mask to a 64-bit mask parameter. |
1da177e4 | 1040 | */ |
877211f5 | 1041 | int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, |
1da177e4 LT |
1042 | u_int64_t mask) |
1043 | { | |
877211f5 TI |
1044 | struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; |
1045 | struct snd_mask *maskp = constrs_mask(constrs, var); | |
1da177e4 LT |
1046 | maskp->bits[0] &= (u_int32_t)mask; |
1047 | maskp->bits[1] &= (u_int32_t)(mask >> 32); | |
1048 | memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */ | |
1049 | if (! maskp->bits[0] && ! maskp->bits[1]) | |
1050 | return -EINVAL; | |
1051 | return 0; | |
1052 | } | |
1053 | ||
1054 | /** | |
1c85cc64 | 1055 | * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval |
df8db936 TI |
1056 | * @runtime: PCM runtime instance |
1057 | * @var: hw_params variable to apply the integer constraint | |
1058 | * | |
1059 | * Apply the constraint of integer to an interval parameter. | |
1da177e4 | 1060 | */ |
877211f5 | 1061 | int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var) |
1da177e4 | 1062 | { |
877211f5 | 1063 | struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; |
1da177e4 LT |
1064 | return snd_interval_setinteger(constrs_interval(constrs, var)); |
1065 | } | |
1066 | ||
e88e8ae6 TI |
1067 | EXPORT_SYMBOL(snd_pcm_hw_constraint_integer); |
1068 | ||
1da177e4 | 1069 | /** |
1c85cc64 | 1070 | * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval |
df8db936 TI |
1071 | * @runtime: PCM runtime instance |
1072 | * @var: hw_params variable to apply the range | |
1073 | * @min: the minimal value | |
1074 | * @max: the maximal value | |
1075 | * | |
1076 | * Apply the min/max range constraint to an interval parameter. | |
1da177e4 | 1077 | */ |
877211f5 | 1078 | int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, |
1da177e4 LT |
1079 | unsigned int min, unsigned int max) |
1080 | { | |
877211f5 TI |
1081 | struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; |
1082 | struct snd_interval t; | |
1da177e4 LT |
1083 | t.min = min; |
1084 | t.max = max; | |
1085 | t.openmin = t.openmax = 0; | |
1086 | t.integer = 0; | |
1087 | return snd_interval_refine(constrs_interval(constrs, var), &t); | |
1088 | } | |
1089 | ||
e88e8ae6 TI |
1090 | EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax); |
1091 | ||
877211f5 TI |
1092 | static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params, |
1093 | struct snd_pcm_hw_rule *rule) | |
1da177e4 | 1094 | { |
877211f5 | 1095 | struct snd_pcm_hw_constraint_list *list = rule->private; |
1da177e4 LT |
1096 | return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask); |
1097 | } | |
1098 | ||
1099 | ||
1100 | /** | |
1c85cc64 | 1101 | * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter |
df8db936 TI |
1102 | * @runtime: PCM runtime instance |
1103 | * @cond: condition bits | |
1104 | * @var: hw_params variable to apply the list constraint | |
1105 | * @l: list | |
1106 | * | |
1107 | * Apply the list of constraints to an interval parameter. | |
1da177e4 | 1108 | */ |
877211f5 | 1109 | int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime, |
1da177e4 LT |
1110 | unsigned int cond, |
1111 | snd_pcm_hw_param_t var, | |
877211f5 | 1112 | struct snd_pcm_hw_constraint_list *l) |
1da177e4 LT |
1113 | { |
1114 | return snd_pcm_hw_rule_add(runtime, cond, var, | |
1115 | snd_pcm_hw_rule_list, l, | |
1116 | var, -1); | |
1117 | } | |
1118 | ||
e88e8ae6 TI |
1119 | EXPORT_SYMBOL(snd_pcm_hw_constraint_list); |
1120 | ||
877211f5 TI |
1121 | static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params, |
1122 | struct snd_pcm_hw_rule *rule) | |
1da177e4 | 1123 | { |
877211f5 | 1124 | struct snd_pcm_hw_constraint_ratnums *r = rule->private; |
1da177e4 LT |
1125 | unsigned int num = 0, den = 0; |
1126 | int err; | |
1127 | err = snd_interval_ratnum(hw_param_interval(params, rule->var), | |
1128 | r->nrats, r->rats, &num, &den); | |
1129 | if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) { | |
1130 | params->rate_num = num; | |
1131 | params->rate_den = den; | |
1132 | } | |
1133 | return err; | |
1134 | } | |
1135 | ||
1136 | /** | |
1c85cc64 | 1137 | * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter |
df8db936 TI |
1138 | * @runtime: PCM runtime instance |
1139 | * @cond: condition bits | |
1140 | * @var: hw_params variable to apply the ratnums constraint | |
877211f5 | 1141 | * @r: struct snd_ratnums constriants |
1da177e4 | 1142 | */ |
877211f5 | 1143 | int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime, |
1da177e4 LT |
1144 | unsigned int cond, |
1145 | snd_pcm_hw_param_t var, | |
877211f5 | 1146 | struct snd_pcm_hw_constraint_ratnums *r) |
1da177e4 LT |
1147 | { |
1148 | return snd_pcm_hw_rule_add(runtime, cond, var, | |
1149 | snd_pcm_hw_rule_ratnums, r, | |
1150 | var, -1); | |
1151 | } | |
1152 | ||
e88e8ae6 TI |
1153 | EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums); |
1154 | ||
877211f5 TI |
1155 | static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params, |
1156 | struct snd_pcm_hw_rule *rule) | |
1da177e4 | 1157 | { |
877211f5 | 1158 | struct snd_pcm_hw_constraint_ratdens *r = rule->private; |
1da177e4 LT |
1159 | unsigned int num = 0, den = 0; |
1160 | int err = snd_interval_ratden(hw_param_interval(params, rule->var), | |
1161 | r->nrats, r->rats, &num, &den); | |
1162 | if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) { | |
1163 | params->rate_num = num; | |
1164 | params->rate_den = den; | |
1165 | } | |
1166 | return err; | |
1167 | } | |
1168 | ||
1169 | /** | |
1c85cc64 | 1170 | * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter |
df8db936 TI |
1171 | * @runtime: PCM runtime instance |
1172 | * @cond: condition bits | |
1173 | * @var: hw_params variable to apply the ratdens constraint | |
877211f5 | 1174 | * @r: struct snd_ratdens constriants |
1da177e4 | 1175 | */ |
877211f5 | 1176 | int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime, |
1da177e4 LT |
1177 | unsigned int cond, |
1178 | snd_pcm_hw_param_t var, | |
877211f5 | 1179 | struct snd_pcm_hw_constraint_ratdens *r) |
1da177e4 LT |
1180 | { |
1181 | return snd_pcm_hw_rule_add(runtime, cond, var, | |
1182 | snd_pcm_hw_rule_ratdens, r, | |
1183 | var, -1); | |
1184 | } | |
1185 | ||
e88e8ae6 TI |
1186 | EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens); |
1187 | ||
877211f5 TI |
1188 | static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params, |
1189 | struct snd_pcm_hw_rule *rule) | |
1da177e4 LT |
1190 | { |
1191 | unsigned int l = (unsigned long) rule->private; | |
1192 | int width = l & 0xffff; | |
1193 | unsigned int msbits = l >> 16; | |
877211f5 | 1194 | struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); |
1da177e4 LT |
1195 | if (snd_interval_single(i) && snd_interval_value(i) == width) |
1196 | params->msbits = msbits; | |
1197 | return 0; | |
1198 | } | |
1199 | ||
1200 | /** | |
1c85cc64 | 1201 | * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule |
df8db936 TI |
1202 | * @runtime: PCM runtime instance |
1203 | * @cond: condition bits | |
1204 | * @width: sample bits width | |
1205 | * @msbits: msbits width | |
1da177e4 | 1206 | */ |
877211f5 | 1207 | int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime, |
1da177e4 LT |
1208 | unsigned int cond, |
1209 | unsigned int width, | |
1210 | unsigned int msbits) | |
1211 | { | |
1212 | unsigned long l = (msbits << 16) | width; | |
1213 | return snd_pcm_hw_rule_add(runtime, cond, -1, | |
1214 | snd_pcm_hw_rule_msbits, | |
1215 | (void*) l, | |
1216 | SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); | |
1217 | } | |
1218 | ||
e88e8ae6 TI |
1219 | EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits); |
1220 | ||
877211f5 TI |
1221 | static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params, |
1222 | struct snd_pcm_hw_rule *rule) | |
1da177e4 LT |
1223 | { |
1224 | unsigned long step = (unsigned long) rule->private; | |
1225 | return snd_interval_step(hw_param_interval(params, rule->var), 0, step); | |
1226 | } | |
1227 | ||
1228 | /** | |
1c85cc64 | 1229 | * snd_pcm_hw_constraint_step - add a hw constraint step rule |
df8db936 TI |
1230 | * @runtime: PCM runtime instance |
1231 | * @cond: condition bits | |
1232 | * @var: hw_params variable to apply the step constraint | |
1233 | * @step: step size | |
1da177e4 | 1234 | */ |
877211f5 | 1235 | int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime, |
1da177e4 LT |
1236 | unsigned int cond, |
1237 | snd_pcm_hw_param_t var, | |
1238 | unsigned long step) | |
1239 | { | |
1240 | return snd_pcm_hw_rule_add(runtime, cond, var, | |
1241 | snd_pcm_hw_rule_step, (void *) step, | |
1242 | var, -1); | |
1243 | } | |
1244 | ||
e88e8ae6 TI |
1245 | EXPORT_SYMBOL(snd_pcm_hw_constraint_step); |
1246 | ||
877211f5 | 1247 | static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule) |
1da177e4 | 1248 | { |
67c39317 | 1249 | static unsigned int pow2_sizes[] = { |
1da177e4 LT |
1250 | 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7, |
1251 | 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15, | |
1252 | 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23, | |
1253 | 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30 | |
1254 | }; | |
1255 | return snd_interval_list(hw_param_interval(params, rule->var), | |
1256 | ARRAY_SIZE(pow2_sizes), pow2_sizes, 0); | |
1257 | } | |
1258 | ||
1259 | /** | |
1c85cc64 | 1260 | * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule |
df8db936 TI |
1261 | * @runtime: PCM runtime instance |
1262 | * @cond: condition bits | |
1263 | * @var: hw_params variable to apply the power-of-2 constraint | |
1da177e4 | 1264 | */ |
877211f5 | 1265 | int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime, |
1da177e4 LT |
1266 | unsigned int cond, |
1267 | snd_pcm_hw_param_t var) | |
1268 | { | |
1269 | return snd_pcm_hw_rule_add(runtime, cond, var, | |
1270 | snd_pcm_hw_rule_pow2, NULL, | |
1271 | var, -1); | |
1272 | } | |
1273 | ||
e88e8ae6 TI |
1274 | EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2); |
1275 | ||
877211f5 | 1276 | static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params, |
123992f7 | 1277 | snd_pcm_hw_param_t var) |
1da177e4 LT |
1278 | { |
1279 | if (hw_is_mask(var)) { | |
1280 | snd_mask_any(hw_param_mask(params, var)); | |
1281 | params->cmask |= 1 << var; | |
1282 | params->rmask |= 1 << var; | |
1283 | return; | |
1284 | } | |
1285 | if (hw_is_interval(var)) { | |
1286 | snd_interval_any(hw_param_interval(params, var)); | |
1287 | params->cmask |= 1 << var; | |
1288 | params->rmask |= 1 << var; | |
1289 | return; | |
1290 | } | |
1291 | snd_BUG(); | |
1292 | } | |
1293 | ||
877211f5 | 1294 | void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params) |
1da177e4 LT |
1295 | { |
1296 | unsigned int k; | |
1297 | memset(params, 0, sizeof(*params)); | |
1298 | for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) | |
1299 | _snd_pcm_hw_param_any(params, k); | |
1300 | for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) | |
1301 | _snd_pcm_hw_param_any(params, k); | |
1302 | params->info = ~0U; | |
1303 | } | |
1304 | ||
e88e8ae6 | 1305 | EXPORT_SYMBOL(_snd_pcm_hw_params_any); |
1da177e4 LT |
1306 | |
1307 | /** | |
1c85cc64 | 1308 | * snd_pcm_hw_param_value - return @params field @var value |
df8db936 TI |
1309 | * @params: the hw_params instance |
1310 | * @var: parameter to retrieve | |
1c85cc64 | 1311 | * @dir: pointer to the direction (-1,0,1) or %NULL |
1da177e4 | 1312 | * |
1c85cc64 RD |
1313 | * Return the value for field @var if it's fixed in configuration space |
1314 | * defined by @params. Return -%EINVAL otherwise. | |
1da177e4 | 1315 | */ |
e88e8ae6 TI |
1316 | int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params, |
1317 | snd_pcm_hw_param_t var, int *dir) | |
1da177e4 LT |
1318 | { |
1319 | if (hw_is_mask(var)) { | |
877211f5 | 1320 | const struct snd_mask *mask = hw_param_mask_c(params, var); |
1da177e4 LT |
1321 | if (!snd_mask_single(mask)) |
1322 | return -EINVAL; | |
1323 | if (dir) | |
1324 | *dir = 0; | |
1325 | return snd_mask_value(mask); | |
1326 | } | |
1327 | if (hw_is_interval(var)) { | |
877211f5 | 1328 | const struct snd_interval *i = hw_param_interval_c(params, var); |
1da177e4 LT |
1329 | if (!snd_interval_single(i)) |
1330 | return -EINVAL; | |
1331 | if (dir) | |
1332 | *dir = i->openmin; | |
1333 | return snd_interval_value(i); | |
1334 | } | |
1da177e4 LT |
1335 | return -EINVAL; |
1336 | } | |
1337 | ||
e88e8ae6 | 1338 | EXPORT_SYMBOL(snd_pcm_hw_param_value); |
1da177e4 | 1339 | |
877211f5 | 1340 | void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, |
1da177e4 LT |
1341 | snd_pcm_hw_param_t var) |
1342 | { | |
1343 | if (hw_is_mask(var)) { | |
1344 | snd_mask_none(hw_param_mask(params, var)); | |
1345 | params->cmask |= 1 << var; | |
1346 | params->rmask |= 1 << var; | |
1347 | } else if (hw_is_interval(var)) { | |
1348 | snd_interval_none(hw_param_interval(params, var)); | |
1349 | params->cmask |= 1 << var; | |
1350 | params->rmask |= 1 << var; | |
1351 | } else { | |
1352 | snd_BUG(); | |
1353 | } | |
1354 | } | |
1355 | ||
e88e8ae6 | 1356 | EXPORT_SYMBOL(_snd_pcm_hw_param_setempty); |
1da177e4 | 1357 | |
877211f5 | 1358 | static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params, |
123992f7 | 1359 | snd_pcm_hw_param_t var) |
1da177e4 LT |
1360 | { |
1361 | int changed; | |
1362 | if (hw_is_mask(var)) | |
1363 | changed = snd_mask_refine_first(hw_param_mask(params, var)); | |
1364 | else if (hw_is_interval(var)) | |
1365 | changed = snd_interval_refine_first(hw_param_interval(params, var)); | |
2f4ca8e5 | 1366 | else |
1da177e4 | 1367 | return -EINVAL; |
1da177e4 LT |
1368 | if (changed) { |
1369 | params->cmask |= 1 << var; | |
1370 | params->rmask |= 1 << var; | |
1371 | } | |
1372 | return changed; | |
1373 | } | |
1374 | ||
1375 | ||
1376 | /** | |
1c85cc64 | 1377 | * snd_pcm_hw_param_first - refine config space and return minimum value |
df8db936 TI |
1378 | * @pcm: PCM instance |
1379 | * @params: the hw_params instance | |
1380 | * @var: parameter to retrieve | |
1c85cc64 | 1381 | * @dir: pointer to the direction (-1,0,1) or %NULL |
1da177e4 | 1382 | * |
1c85cc64 | 1383 | * Inside configuration space defined by @params remove from @var all |
1da177e4 LT |
1384 | * values > minimum. Reduce configuration space accordingly. |
1385 | * Return the minimum. | |
1386 | */ | |
e88e8ae6 TI |
1387 | int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm, |
1388 | struct snd_pcm_hw_params *params, | |
1389 | snd_pcm_hw_param_t var, int *dir) | |
1da177e4 LT |
1390 | { |
1391 | int changed = _snd_pcm_hw_param_first(params, var); | |
1392 | if (changed < 0) | |
1393 | return changed; | |
1394 | if (params->rmask) { | |
1395 | int err = snd_pcm_hw_refine(pcm, params); | |
7eaa943c TI |
1396 | if (snd_BUG_ON(err < 0)) |
1397 | return err; | |
1da177e4 LT |
1398 | } |
1399 | return snd_pcm_hw_param_value(params, var, dir); | |
1400 | } | |
1401 | ||
e88e8ae6 TI |
1402 | EXPORT_SYMBOL(snd_pcm_hw_param_first); |
1403 | ||
877211f5 | 1404 | static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params, |
123992f7 | 1405 | snd_pcm_hw_param_t var) |
1da177e4 LT |
1406 | { |
1407 | int changed; | |
1408 | if (hw_is_mask(var)) | |
1409 | changed = snd_mask_refine_last(hw_param_mask(params, var)); | |
1410 | else if (hw_is_interval(var)) | |
1411 | changed = snd_interval_refine_last(hw_param_interval(params, var)); | |
2f4ca8e5 | 1412 | else |
1da177e4 | 1413 | return -EINVAL; |
1da177e4 LT |
1414 | if (changed) { |
1415 | params->cmask |= 1 << var; | |
1416 | params->rmask |= 1 << var; | |
1417 | } | |
1418 | return changed; | |
1419 | } | |
1420 | ||
1421 | ||
1422 | /** | |
1c85cc64 | 1423 | * snd_pcm_hw_param_last - refine config space and return maximum value |
df8db936 TI |
1424 | * @pcm: PCM instance |
1425 | * @params: the hw_params instance | |
1426 | * @var: parameter to retrieve | |
1c85cc64 | 1427 | * @dir: pointer to the direction (-1,0,1) or %NULL |
1da177e4 | 1428 | * |
1c85cc64 | 1429 | * Inside configuration space defined by @params remove from @var all |
1da177e4 LT |
1430 | * values < maximum. Reduce configuration space accordingly. |
1431 | * Return the maximum. | |
1432 | */ | |
e88e8ae6 TI |
1433 | int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm, |
1434 | struct snd_pcm_hw_params *params, | |
1435 | snd_pcm_hw_param_t var, int *dir) | |
1da177e4 LT |
1436 | { |
1437 | int changed = _snd_pcm_hw_param_last(params, var); | |
1438 | if (changed < 0) | |
1439 | return changed; | |
1440 | if (params->rmask) { | |
1441 | int err = snd_pcm_hw_refine(pcm, params); | |
7eaa943c TI |
1442 | if (snd_BUG_ON(err < 0)) |
1443 | return err; | |
1da177e4 LT |
1444 | } |
1445 | return snd_pcm_hw_param_value(params, var, dir); | |
1446 | } | |
1447 | ||
e88e8ae6 | 1448 | EXPORT_SYMBOL(snd_pcm_hw_param_last); |
1da177e4 LT |
1449 | |
1450 | /** | |
1c85cc64 | 1451 | * snd_pcm_hw_param_choose - choose a configuration defined by @params |
df8db936 TI |
1452 | * @pcm: PCM instance |
1453 | * @params: the hw_params instance | |
1da177e4 | 1454 | * |
1c85cc64 | 1455 | * Choose one configuration from configuration space defined by @params. |
1da177e4 LT |
1456 | * The configuration chosen is that obtained fixing in this order: |
1457 | * first access, first format, first subformat, min channels, | |
1458 | * min rate, min period time, max buffer size, min tick time | |
1459 | */ | |
2f4ca8e5 TI |
1460 | int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm, |
1461 | struct snd_pcm_hw_params *params) | |
1da177e4 | 1462 | { |
2f4ca8e5 TI |
1463 | static int vars[] = { |
1464 | SNDRV_PCM_HW_PARAM_ACCESS, | |
1465 | SNDRV_PCM_HW_PARAM_FORMAT, | |
1466 | SNDRV_PCM_HW_PARAM_SUBFORMAT, | |
1467 | SNDRV_PCM_HW_PARAM_CHANNELS, | |
1468 | SNDRV_PCM_HW_PARAM_RATE, | |
1469 | SNDRV_PCM_HW_PARAM_PERIOD_TIME, | |
1470 | SNDRV_PCM_HW_PARAM_BUFFER_SIZE, | |
1471 | SNDRV_PCM_HW_PARAM_TICK_TIME, | |
1472 | -1 | |
1473 | }; | |
1474 | int err, *v; | |
1da177e4 | 1475 | |
2f4ca8e5 TI |
1476 | for (v = vars; *v != -1; v++) { |
1477 | if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE) | |
1478 | err = snd_pcm_hw_param_first(pcm, params, *v, NULL); | |
1479 | else | |
1480 | err = snd_pcm_hw_param_last(pcm, params, *v, NULL); | |
7eaa943c TI |
1481 | if (snd_BUG_ON(err < 0)) |
1482 | return err; | |
2f4ca8e5 | 1483 | } |
1da177e4 LT |
1484 | return 0; |
1485 | } | |
1486 | ||
877211f5 | 1487 | static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream, |
1da177e4 LT |
1488 | void *arg) |
1489 | { | |
877211f5 | 1490 | struct snd_pcm_runtime *runtime = substream->runtime; |
1da177e4 LT |
1491 | unsigned long flags; |
1492 | snd_pcm_stream_lock_irqsave(substream, flags); | |
1493 | if (snd_pcm_running(substream) && | |
1494 | snd_pcm_update_hw_ptr(substream) >= 0) | |
1495 | runtime->status->hw_ptr %= runtime->buffer_size; | |
1496 | else | |
1497 | runtime->status->hw_ptr = 0; | |
1498 | snd_pcm_stream_unlock_irqrestore(substream, flags); | |
1499 | return 0; | |
1500 | } | |
1501 | ||
877211f5 | 1502 | static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream, |
1da177e4 LT |
1503 | void *arg) |
1504 | { | |
877211f5 TI |
1505 | struct snd_pcm_channel_info *info = arg; |
1506 | struct snd_pcm_runtime *runtime = substream->runtime; | |
1da177e4 LT |
1507 | int width; |
1508 | if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) { | |
1509 | info->offset = -1; | |
1510 | return 0; | |
1511 | } | |
1512 | width = snd_pcm_format_physical_width(runtime->format); | |
1513 | if (width < 0) | |
1514 | return width; | |
1515 | info->offset = 0; | |
1516 | switch (runtime->access) { | |
1517 | case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED: | |
1518 | case SNDRV_PCM_ACCESS_RW_INTERLEAVED: | |
1519 | info->first = info->channel * width; | |
1520 | info->step = runtime->channels * width; | |
1521 | break; | |
1522 | case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED: | |
1523 | case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED: | |
1524 | { | |
1525 | size_t size = runtime->dma_bytes / runtime->channels; | |
1526 | info->first = info->channel * size * 8; | |
1527 | info->step = width; | |
1528 | break; | |
1529 | } | |
1530 | default: | |
1531 | snd_BUG(); | |
1532 | break; | |
1533 | } | |
1534 | return 0; | |
1535 | } | |
1536 | ||
8bea869c JK |
1537 | static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream, |
1538 | void *arg) | |
1539 | { | |
1540 | struct snd_pcm_hw_params *params = arg; | |
1541 | snd_pcm_format_t format; | |
1542 | int channels, width; | |
1543 | ||
1544 | params->fifo_size = substream->runtime->hw.fifo_size; | |
1545 | if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) { | |
1546 | format = params_format(params); | |
1547 | channels = params_channels(params); | |
1548 | width = snd_pcm_format_physical_width(format); | |
1549 | params->fifo_size /= width * channels; | |
1550 | } | |
1551 | return 0; | |
1552 | } | |
1553 | ||
1da177e4 LT |
1554 | /** |
1555 | * snd_pcm_lib_ioctl - a generic PCM ioctl callback | |
1556 | * @substream: the pcm substream instance | |
1557 | * @cmd: ioctl command | |
1558 | * @arg: ioctl argument | |
1559 | * | |
1560 | * Processes the generic ioctl commands for PCM. | |
1561 | * Can be passed as the ioctl callback for PCM ops. | |
1562 | * | |
1563 | * Returns zero if successful, or a negative error code on failure. | |
1564 | */ | |
877211f5 | 1565 | int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream, |
1da177e4 LT |
1566 | unsigned int cmd, void *arg) |
1567 | { | |
1568 | switch (cmd) { | |
1569 | case SNDRV_PCM_IOCTL1_INFO: | |
1570 | return 0; | |
1571 | case SNDRV_PCM_IOCTL1_RESET: | |
1572 | return snd_pcm_lib_ioctl_reset(substream, arg); | |
1573 | case SNDRV_PCM_IOCTL1_CHANNEL_INFO: | |
1574 | return snd_pcm_lib_ioctl_channel_info(substream, arg); | |
8bea869c JK |
1575 | case SNDRV_PCM_IOCTL1_FIFO_SIZE: |
1576 | return snd_pcm_lib_ioctl_fifo_size(substream, arg); | |
1da177e4 LT |
1577 | } |
1578 | return -ENXIO; | |
1579 | } | |
1580 | ||
e88e8ae6 TI |
1581 | EXPORT_SYMBOL(snd_pcm_lib_ioctl); |
1582 | ||
1da177e4 LT |
1583 | /** |
1584 | * snd_pcm_period_elapsed - update the pcm status for the next period | |
1585 | * @substream: the pcm substream instance | |
1586 | * | |
1587 | * This function is called from the interrupt handler when the | |
1588 | * PCM has processed the period size. It will update the current | |
31e8960b | 1589 | * pointer, wake up sleepers, etc. |
1da177e4 LT |
1590 | * |
1591 | * Even if more than one periods have elapsed since the last call, you | |
1592 | * have to call this only once. | |
1593 | */ | |
877211f5 | 1594 | void snd_pcm_period_elapsed(struct snd_pcm_substream *substream) |
1da177e4 | 1595 | { |
877211f5 | 1596 | struct snd_pcm_runtime *runtime; |
1da177e4 LT |
1597 | unsigned long flags; |
1598 | ||
7eaa943c TI |
1599 | if (PCM_RUNTIME_CHECK(substream)) |
1600 | return; | |
1da177e4 | 1601 | runtime = substream->runtime; |
1da177e4 LT |
1602 | |
1603 | if (runtime->transfer_ack_begin) | |
1604 | runtime->transfer_ack_begin(substream); | |
1605 | ||
1606 | snd_pcm_stream_lock_irqsave(substream, flags); | |
1607 | if (!snd_pcm_running(substream) || | |
1608 | snd_pcm_update_hw_ptr_interrupt(substream) < 0) | |
1609 | goto _end; | |
1610 | ||
1611 | if (substream->timer_running) | |
1612 | snd_timer_interrupt(substream->timer, 1); | |
1da177e4 LT |
1613 | _end: |
1614 | snd_pcm_stream_unlock_irqrestore(substream, flags); | |
1615 | if (runtime->transfer_ack_end) | |
1616 | runtime->transfer_ack_end(substream); | |
1617 | kill_fasync(&runtime->fasync, SIGIO, POLL_IN); | |
1618 | } | |
1619 | ||
e88e8ae6 TI |
1620 | EXPORT_SYMBOL(snd_pcm_period_elapsed); |
1621 | ||
13075510 TI |
1622 | /* |
1623 | * Wait until avail_min data becomes available | |
1624 | * Returns a negative error code if any error occurs during operation. | |
1625 | * The available space is stored on availp. When err = 0 and avail = 0 | |
1626 | * on the capture stream, it indicates the stream is in DRAINING state. | |
1627 | */ | |
1628 | static int wait_for_avail_min(struct snd_pcm_substream *substream, | |
1629 | snd_pcm_uframes_t *availp) | |
1630 | { | |
1631 | struct snd_pcm_runtime *runtime = substream->runtime; | |
1632 | int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK; | |
1633 | wait_queue_t wait; | |
1634 | int err = 0; | |
1635 | snd_pcm_uframes_t avail = 0; | |
1636 | long tout; | |
1637 | ||
1638 | init_waitqueue_entry(&wait, current); | |
1639 | add_wait_queue(&runtime->sleep, &wait); | |
1640 | for (;;) { | |
1641 | if (signal_pending(current)) { | |
1642 | err = -ERESTARTSYS; | |
1643 | break; | |
1644 | } | |
1645 | set_current_state(TASK_INTERRUPTIBLE); | |
1646 | snd_pcm_stream_unlock_irq(substream); | |
1647 | tout = schedule_timeout(msecs_to_jiffies(10000)); | |
1648 | snd_pcm_stream_lock_irq(substream); | |
1649 | switch (runtime->status->state) { | |
1650 | case SNDRV_PCM_STATE_SUSPENDED: | |
1651 | err = -ESTRPIPE; | |
1652 | goto _endloop; | |
1653 | case SNDRV_PCM_STATE_XRUN: | |
1654 | err = -EPIPE; | |
1655 | goto _endloop; | |
1656 | case SNDRV_PCM_STATE_DRAINING: | |
1657 | if (is_playback) | |
1658 | err = -EPIPE; | |
1659 | else | |
1660 | avail = 0; /* indicate draining */ | |
1661 | goto _endloop; | |
1662 | case SNDRV_PCM_STATE_OPEN: | |
1663 | case SNDRV_PCM_STATE_SETUP: | |
1664 | case SNDRV_PCM_STATE_DISCONNECTED: | |
1665 | err = -EBADFD; | |
1666 | goto _endloop; | |
1667 | } | |
1668 | if (!tout) { | |
1669 | snd_printd("%s write error (DMA or IRQ trouble?)\n", | |
1670 | is_playback ? "playback" : "capture"); | |
1671 | err = -EIO; | |
1672 | break; | |
1673 | } | |
1674 | if (is_playback) | |
1675 | avail = snd_pcm_playback_avail(runtime); | |
1676 | else | |
1677 | avail = snd_pcm_capture_avail(runtime); | |
1678 | if (avail >= runtime->control->avail_min) | |
1679 | break; | |
1680 | } | |
1681 | _endloop: | |
1682 | remove_wait_queue(&runtime->sleep, &wait); | |
1683 | *availp = avail; | |
1684 | return err; | |
1685 | } | |
1686 | ||
877211f5 | 1687 | static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream, |
1da177e4 LT |
1688 | unsigned int hwoff, |
1689 | unsigned long data, unsigned int off, | |
1690 | snd_pcm_uframes_t frames) | |
1691 | { | |
877211f5 | 1692 | struct snd_pcm_runtime *runtime = substream->runtime; |
1da177e4 LT |
1693 | int err; |
1694 | char __user *buf = (char __user *) data + frames_to_bytes(runtime, off); | |
1695 | if (substream->ops->copy) { | |
1696 | if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0) | |
1697 | return err; | |
1698 | } else { | |
1699 | char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff); | |
1da177e4 LT |
1700 | if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames))) |
1701 | return -EFAULT; | |
1702 | } | |
1703 | return 0; | |
1704 | } | |
1705 | ||
877211f5 | 1706 | typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff, |
1da177e4 LT |
1707 | unsigned long data, unsigned int off, |
1708 | snd_pcm_uframes_t size); | |
1709 | ||
877211f5 | 1710 | static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream, |
1da177e4 LT |
1711 | unsigned long data, |
1712 | snd_pcm_uframes_t size, | |
1713 | int nonblock, | |
1714 | transfer_f transfer) | |
1715 | { | |
877211f5 | 1716 | struct snd_pcm_runtime *runtime = substream->runtime; |
1da177e4 LT |
1717 | snd_pcm_uframes_t xfer = 0; |
1718 | snd_pcm_uframes_t offset = 0; | |
1719 | int err = 0; | |
1720 | ||
1721 | if (size == 0) | |
1722 | return 0; | |
1da177e4 LT |
1723 | |
1724 | snd_pcm_stream_lock_irq(substream); | |
1725 | switch (runtime->status->state) { | |
1726 | case SNDRV_PCM_STATE_PREPARED: | |
1727 | case SNDRV_PCM_STATE_RUNNING: | |
1728 | case SNDRV_PCM_STATE_PAUSED: | |
1729 | break; | |
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 | err = -EBADFD; | |
1738 | goto _end_unlock; | |
1739 | } | |
1740 | ||
1741 | while (size > 0) { | |
1742 | snd_pcm_uframes_t frames, appl_ptr, appl_ofs; | |
1743 | snd_pcm_uframes_t avail; | |
1744 | snd_pcm_uframes_t cont; | |
31e8960b | 1745 | if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) |
1da177e4 LT |
1746 | snd_pcm_update_hw_ptr(substream); |
1747 | avail = snd_pcm_playback_avail(runtime); | |
13075510 | 1748 | if (!avail) { |
1da177e4 LT |
1749 | if (nonblock) { |
1750 | err = -EAGAIN; | |
1751 | goto _end_unlock; | |
1752 | } | |
13075510 TI |
1753 | err = wait_for_avail_min(substream, &avail); |
1754 | if (err < 0) | |
443feb88 | 1755 | goto _end_unlock; |
1da177e4 | 1756 | } |
1da177e4 LT |
1757 | frames = size > avail ? avail : size; |
1758 | cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size; | |
1759 | if (frames > cont) | |
1760 | frames = cont; | |
7eaa943c TI |
1761 | if (snd_BUG_ON(!frames)) { |
1762 | snd_pcm_stream_unlock_irq(substream); | |
1763 | return -EINVAL; | |
1764 | } | |
1da177e4 LT |
1765 | appl_ptr = runtime->control->appl_ptr; |
1766 | appl_ofs = appl_ptr % runtime->buffer_size; | |
1767 | snd_pcm_stream_unlock_irq(substream); | |
1768 | if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0) | |
1769 | goto _end; | |
1770 | snd_pcm_stream_lock_irq(substream); | |
1771 | switch (runtime->status->state) { | |
1772 | case SNDRV_PCM_STATE_XRUN: | |
1773 | err = -EPIPE; | |
1774 | goto _end_unlock; | |
1775 | case SNDRV_PCM_STATE_SUSPENDED: | |
1776 | err = -ESTRPIPE; | |
1777 | goto _end_unlock; | |
1778 | default: | |
1779 | break; | |
1780 | } | |
1781 | appl_ptr += frames; | |
1782 | if (appl_ptr >= runtime->boundary) | |
1783 | appl_ptr -= runtime->boundary; | |
1784 | runtime->control->appl_ptr = appl_ptr; | |
1785 | if (substream->ops->ack) | |
1786 | substream->ops->ack(substream); | |
1787 | ||
1788 | offset += frames; | |
1789 | size -= frames; | |
1790 | xfer += frames; | |
1791 | if (runtime->status->state == SNDRV_PCM_STATE_PREPARED && | |
1792 | snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) { | |
1793 | err = snd_pcm_start(substream); | |
1794 | if (err < 0) | |
1795 | goto _end_unlock; | |
1796 | } | |
1da177e4 LT |
1797 | } |
1798 | _end_unlock: | |
1799 | snd_pcm_stream_unlock_irq(substream); | |
1800 | _end: | |
1801 | return xfer > 0 ? (snd_pcm_sframes_t)xfer : err; | |
1802 | } | |
1803 | ||
7eaa943c TI |
1804 | /* sanity-check for read/write methods */ |
1805 | static int pcm_sanity_check(struct snd_pcm_substream *substream) | |
1da177e4 | 1806 | { |
877211f5 | 1807 | struct snd_pcm_runtime *runtime; |
7eaa943c TI |
1808 | if (PCM_RUNTIME_CHECK(substream)) |
1809 | return -ENXIO; | |
1da177e4 | 1810 | runtime = substream->runtime; |
7eaa943c TI |
1811 | if (snd_BUG_ON(!substream->ops->copy && !runtime->dma_area)) |
1812 | return -EINVAL; | |
1da177e4 LT |
1813 | if (runtime->status->state == SNDRV_PCM_STATE_OPEN) |
1814 | return -EBADFD; | |
7eaa943c TI |
1815 | return 0; |
1816 | } | |
1817 | ||
1818 | snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, const void __user *buf, snd_pcm_uframes_t size) | |
1819 | { | |
1820 | struct snd_pcm_runtime *runtime; | |
1821 | int nonblock; | |
1822 | int err; | |
1da177e4 | 1823 | |
7eaa943c TI |
1824 | err = pcm_sanity_check(substream); |
1825 | if (err < 0) | |
1826 | return err; | |
1827 | runtime = substream->runtime; | |
0df63e44 | 1828 | nonblock = !!(substream->f_flags & O_NONBLOCK); |
1da177e4 LT |
1829 | |
1830 | if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED && | |
1831 | runtime->channels > 1) | |
1832 | return -EINVAL; | |
1833 | return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock, | |
1834 | snd_pcm_lib_write_transfer); | |
1835 | } | |
1836 | ||
e88e8ae6 TI |
1837 | EXPORT_SYMBOL(snd_pcm_lib_write); |
1838 | ||
877211f5 | 1839 | static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream, |
1da177e4 LT |
1840 | unsigned int hwoff, |
1841 | unsigned long data, unsigned int off, | |
1842 | snd_pcm_uframes_t frames) | |
1843 | { | |
877211f5 | 1844 | struct snd_pcm_runtime *runtime = substream->runtime; |
1da177e4 LT |
1845 | int err; |
1846 | void __user **bufs = (void __user **)data; | |
1847 | int channels = runtime->channels; | |
1848 | int c; | |
1849 | if (substream->ops->copy) { | |
7eaa943c TI |
1850 | if (snd_BUG_ON(!substream->ops->silence)) |
1851 | return -EINVAL; | |
1da177e4 LT |
1852 | for (c = 0; c < channels; ++c, ++bufs) { |
1853 | if (*bufs == NULL) { | |
1854 | if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0) | |
1855 | return err; | |
1856 | } else { | |
1857 | char __user *buf = *bufs + samples_to_bytes(runtime, off); | |
1858 | if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0) | |
1859 | return err; | |
1860 | } | |
1861 | } | |
1862 | } else { | |
1863 | /* default transfer behaviour */ | |
1864 | size_t dma_csize = runtime->dma_bytes / channels; | |
1da177e4 LT |
1865 | for (c = 0; c < channels; ++c, ++bufs) { |
1866 | char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff); | |
1867 | if (*bufs == NULL) { | |
1868 | snd_pcm_format_set_silence(runtime->format, hwbuf, frames); | |
1869 | } else { | |
1870 | char __user *buf = *bufs + samples_to_bytes(runtime, off); | |
1871 | if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames))) | |
1872 | return -EFAULT; | |
1873 | } | |
1874 | } | |
1875 | } | |
1876 | return 0; | |
1877 | } | |
1878 | ||
877211f5 | 1879 | snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream, |
1da177e4 LT |
1880 | void __user **bufs, |
1881 | snd_pcm_uframes_t frames) | |
1882 | { | |
877211f5 | 1883 | struct snd_pcm_runtime *runtime; |
1da177e4 | 1884 | int nonblock; |
7eaa943c | 1885 | int err; |
1da177e4 | 1886 | |
7eaa943c TI |
1887 | err = pcm_sanity_check(substream); |
1888 | if (err < 0) | |
1889 | return err; | |
1da177e4 | 1890 | runtime = substream->runtime; |
0df63e44 | 1891 | nonblock = !!(substream->f_flags & O_NONBLOCK); |
1da177e4 LT |
1892 | |
1893 | if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) | |
1894 | return -EINVAL; | |
1895 | return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames, | |
1896 | nonblock, snd_pcm_lib_writev_transfer); | |
1897 | } | |
1898 | ||
e88e8ae6 TI |
1899 | EXPORT_SYMBOL(snd_pcm_lib_writev); |
1900 | ||
877211f5 | 1901 | static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream, |
1da177e4 LT |
1902 | unsigned int hwoff, |
1903 | unsigned long data, unsigned int off, | |
1904 | snd_pcm_uframes_t frames) | |
1905 | { | |
877211f5 | 1906 | struct snd_pcm_runtime *runtime = substream->runtime; |
1da177e4 LT |
1907 | int err; |
1908 | char __user *buf = (char __user *) data + frames_to_bytes(runtime, off); | |
1909 | if (substream->ops->copy) { | |
1910 | if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0) | |
1911 | return err; | |
1912 | } else { | |
1913 | char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff); | |
1da177e4 LT |
1914 | if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames))) |
1915 | return -EFAULT; | |
1916 | } | |
1917 | return 0; | |
1918 | } | |
1919 | ||
877211f5 | 1920 | static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream, |
1da177e4 LT |
1921 | unsigned long data, |
1922 | snd_pcm_uframes_t size, | |
1923 | int nonblock, | |
1924 | transfer_f transfer) | |
1925 | { | |
877211f5 | 1926 | struct snd_pcm_runtime *runtime = substream->runtime; |
1da177e4 LT |
1927 | snd_pcm_uframes_t xfer = 0; |
1928 | snd_pcm_uframes_t offset = 0; | |
1929 | int err = 0; | |
1930 | ||
1931 | if (size == 0) | |
1932 | return 0; | |
1da177e4 LT |
1933 | |
1934 | snd_pcm_stream_lock_irq(substream); | |
1935 | switch (runtime->status->state) { | |
1936 | case SNDRV_PCM_STATE_PREPARED: | |
1937 | if (size >= runtime->start_threshold) { | |
1938 | err = snd_pcm_start(substream); | |
1939 | if (err < 0) | |
1940 | goto _end_unlock; | |
1941 | } | |
1942 | break; | |
1943 | case SNDRV_PCM_STATE_DRAINING: | |
1944 | case SNDRV_PCM_STATE_RUNNING: | |
1945 | case SNDRV_PCM_STATE_PAUSED: | |
1946 | break; | |
1947 | case SNDRV_PCM_STATE_XRUN: | |
1948 | err = -EPIPE; | |
1949 | goto _end_unlock; | |
1950 | case SNDRV_PCM_STATE_SUSPENDED: | |
1951 | err = -ESTRPIPE; | |
1952 | goto _end_unlock; | |
1953 | default: | |
1954 | err = -EBADFD; | |
1955 | goto _end_unlock; | |
1956 | } | |
1957 | ||
1958 | while (size > 0) { | |
1959 | snd_pcm_uframes_t frames, appl_ptr, appl_ofs; | |
1960 | snd_pcm_uframes_t avail; | |
1961 | snd_pcm_uframes_t cont; | |
31e8960b | 1962 | if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) |
1da177e4 | 1963 | snd_pcm_update_hw_ptr(substream); |
1da177e4 | 1964 | avail = snd_pcm_capture_avail(runtime); |
13075510 TI |
1965 | if (!avail) { |
1966 | if (runtime->status->state == | |
1967 | SNDRV_PCM_STATE_DRAINING) { | |
1968 | snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); | |
1da177e4 LT |
1969 | goto _end_unlock; |
1970 | } | |
1da177e4 LT |
1971 | if (nonblock) { |
1972 | err = -EAGAIN; | |
1973 | goto _end_unlock; | |
1974 | } | |
13075510 TI |
1975 | err = wait_for_avail_min(substream, &avail); |
1976 | if (err < 0) | |
443feb88 | 1977 | goto _end_unlock; |
13075510 TI |
1978 | if (!avail) |
1979 | continue; /* draining */ | |
1da177e4 | 1980 | } |
1da177e4 LT |
1981 | frames = size > avail ? avail : size; |
1982 | cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size; | |
1983 | if (frames > cont) | |
1984 | frames = cont; | |
7eaa943c TI |
1985 | if (snd_BUG_ON(!frames)) { |
1986 | snd_pcm_stream_unlock_irq(substream); | |
1987 | return -EINVAL; | |
1988 | } | |
1da177e4 LT |
1989 | appl_ptr = runtime->control->appl_ptr; |
1990 | appl_ofs = appl_ptr % runtime->buffer_size; | |
1991 | snd_pcm_stream_unlock_irq(substream); | |
1992 | if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0) | |
1993 | goto _end; | |
1994 | snd_pcm_stream_lock_irq(substream); | |
1995 | switch (runtime->status->state) { | |
1996 | case SNDRV_PCM_STATE_XRUN: | |
1997 | err = -EPIPE; | |
1998 | goto _end_unlock; | |
1999 | case SNDRV_PCM_STATE_SUSPENDED: | |
2000 | err = -ESTRPIPE; | |
2001 | goto _end_unlock; | |
2002 | default: | |
2003 | break; | |
2004 | } | |
2005 | appl_ptr += frames; | |
2006 | if (appl_ptr >= runtime->boundary) | |
2007 | appl_ptr -= runtime->boundary; | |
2008 | runtime->control->appl_ptr = appl_ptr; | |
2009 | if (substream->ops->ack) | |
2010 | substream->ops->ack(substream); | |
2011 | ||
2012 | offset += frames; | |
2013 | size -= frames; | |
2014 | xfer += frames; | |
1da177e4 LT |
2015 | } |
2016 | _end_unlock: | |
2017 | snd_pcm_stream_unlock_irq(substream); | |
2018 | _end: | |
2019 | return xfer > 0 ? (snd_pcm_sframes_t)xfer : err; | |
2020 | } | |
2021 | ||
877211f5 | 2022 | snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, void __user *buf, snd_pcm_uframes_t size) |
1da177e4 | 2023 | { |
877211f5 | 2024 | struct snd_pcm_runtime *runtime; |
1da177e4 | 2025 | int nonblock; |
7eaa943c | 2026 | int err; |
1da177e4 | 2027 | |
7eaa943c TI |
2028 | err = pcm_sanity_check(substream); |
2029 | if (err < 0) | |
2030 | return err; | |
1da177e4 | 2031 | runtime = substream->runtime; |
0df63e44 | 2032 | nonblock = !!(substream->f_flags & O_NONBLOCK); |
1da177e4 LT |
2033 | if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED) |
2034 | return -EINVAL; | |
2035 | return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer); | |
2036 | } | |
2037 | ||
e88e8ae6 TI |
2038 | EXPORT_SYMBOL(snd_pcm_lib_read); |
2039 | ||
877211f5 | 2040 | static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream, |
1da177e4 LT |
2041 | unsigned int hwoff, |
2042 | unsigned long data, unsigned int off, | |
2043 | snd_pcm_uframes_t frames) | |
2044 | { | |
877211f5 | 2045 | struct snd_pcm_runtime *runtime = substream->runtime; |
1da177e4 LT |
2046 | int err; |
2047 | void __user **bufs = (void __user **)data; | |
2048 | int channels = runtime->channels; | |
2049 | int c; | |
2050 | if (substream->ops->copy) { | |
2051 | for (c = 0; c < channels; ++c, ++bufs) { | |
2052 | char __user *buf; | |
2053 | if (*bufs == NULL) | |
2054 | continue; | |
2055 | buf = *bufs + samples_to_bytes(runtime, off); | |
2056 | if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0) | |
2057 | return err; | |
2058 | } | |
2059 | } else { | |
2060 | snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels; | |
1da177e4 LT |
2061 | for (c = 0; c < channels; ++c, ++bufs) { |
2062 | char *hwbuf; | |
2063 | char __user *buf; | |
2064 | if (*bufs == NULL) | |
2065 | continue; | |
2066 | ||
2067 | hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff); | |
2068 | buf = *bufs + samples_to_bytes(runtime, off); | |
2069 | if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames))) | |
2070 | return -EFAULT; | |
2071 | } | |
2072 | } | |
2073 | return 0; | |
2074 | } | |
2075 | ||
877211f5 | 2076 | snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream, |
1da177e4 LT |
2077 | void __user **bufs, |
2078 | snd_pcm_uframes_t frames) | |
2079 | { | |
877211f5 | 2080 | struct snd_pcm_runtime *runtime; |
1da177e4 | 2081 | int nonblock; |
7eaa943c | 2082 | int err; |
1da177e4 | 2083 | |
7eaa943c TI |
2084 | err = pcm_sanity_check(substream); |
2085 | if (err < 0) | |
2086 | return err; | |
1da177e4 | 2087 | runtime = substream->runtime; |
1da177e4 LT |
2088 | if (runtime->status->state == SNDRV_PCM_STATE_OPEN) |
2089 | return -EBADFD; | |
2090 | ||
0df63e44 | 2091 | nonblock = !!(substream->f_flags & O_NONBLOCK); |
1da177e4 LT |
2092 | if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) |
2093 | return -EINVAL; | |
2094 | return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer); | |
2095 | } | |
2096 | ||
1da177e4 | 2097 | EXPORT_SYMBOL(snd_pcm_lib_readv); |