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Merge branch 'linus' of master.kernel.org:/pub/scm/linux/kernel/git/perex/alsa
[deliverable/linux.git] / sound / core / pcm_native.c
1 /*
2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@suse.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22 #include <sound/driver.h>
23 #include <linux/mm.h>
24 #include <linux/smp_lock.h>
25 #include <linux/file.h>
26 #include <linux/slab.h>
27 #include <linux/time.h>
28 #include <linux/latency.h>
29 #include <linux/uio.h>
30 #include <sound/core.h>
31 #include <sound/control.h>
32 #include <sound/info.h>
33 #include <sound/pcm.h>
34 #include <sound/pcm_params.h>
35 #include <sound/timer.h>
36 #include <sound/minors.h>
37 #include <asm/io.h>
38
39 /*
40 * Compatibility
41 */
42
43 struct snd_pcm_hw_params_old {
44 unsigned int flags;
45 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
46 SNDRV_PCM_HW_PARAM_ACCESS + 1];
47 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
48 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
49 unsigned int rmask;
50 unsigned int cmask;
51 unsigned int info;
52 unsigned int msbits;
53 unsigned int rate_num;
54 unsigned int rate_den;
55 snd_pcm_uframes_t fifo_size;
56 unsigned char reserved[64];
57 };
58
59 #ifdef CONFIG_SND_SUPPORT_OLD_API
60 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
61 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
62
63 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
64 struct snd_pcm_hw_params_old __user * _oparams);
65 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
66 struct snd_pcm_hw_params_old __user * _oparams);
67 #endif
68 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
69
70 /*
71 *
72 */
73
74 DEFINE_RWLOCK(snd_pcm_link_rwlock);
75 EXPORT_SYMBOL(snd_pcm_link_rwlock);
76
77 static DECLARE_RWSEM(snd_pcm_link_rwsem);
78
79 static inline mm_segment_t snd_enter_user(void)
80 {
81 mm_segment_t fs = get_fs();
82 set_fs(get_ds());
83 return fs;
84 }
85
86 static inline void snd_leave_user(mm_segment_t fs)
87 {
88 set_fs(fs);
89 }
90
91
92
93 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
94 {
95 struct snd_pcm_runtime *runtime;
96 struct snd_pcm *pcm = substream->pcm;
97 struct snd_pcm_str *pstr = substream->pstr;
98
99 snd_assert(substream != NULL, return -ENXIO);
100 memset(info, 0, sizeof(*info));
101 info->card = pcm->card->number;
102 info->device = pcm->device;
103 info->stream = substream->stream;
104 info->subdevice = substream->number;
105 strlcpy(info->id, pcm->id, sizeof(info->id));
106 strlcpy(info->name, pcm->name, sizeof(info->name));
107 info->dev_class = pcm->dev_class;
108 info->dev_subclass = pcm->dev_subclass;
109 info->subdevices_count = pstr->substream_count;
110 info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
111 strlcpy(info->subname, substream->name, sizeof(info->subname));
112 runtime = substream->runtime;
113 /* AB: FIXME!!! This is definitely nonsense */
114 if (runtime) {
115 info->sync = runtime->sync;
116 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
117 }
118 return 0;
119 }
120
121 int snd_pcm_info_user(struct snd_pcm_substream *substream,
122 struct snd_pcm_info __user * _info)
123 {
124 struct snd_pcm_info *info;
125 int err;
126
127 info = kmalloc(sizeof(*info), GFP_KERNEL);
128 if (! info)
129 return -ENOMEM;
130 err = snd_pcm_info(substream, info);
131 if (err >= 0) {
132 if (copy_to_user(_info, info, sizeof(*info)))
133 err = -EFAULT;
134 }
135 kfree(info);
136 return err;
137 }
138
139 #undef RULES_DEBUG
140
141 #ifdef RULES_DEBUG
142 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
143 char *snd_pcm_hw_param_names[] = {
144 HW_PARAM(ACCESS),
145 HW_PARAM(FORMAT),
146 HW_PARAM(SUBFORMAT),
147 HW_PARAM(SAMPLE_BITS),
148 HW_PARAM(FRAME_BITS),
149 HW_PARAM(CHANNELS),
150 HW_PARAM(RATE),
151 HW_PARAM(PERIOD_TIME),
152 HW_PARAM(PERIOD_SIZE),
153 HW_PARAM(PERIOD_BYTES),
154 HW_PARAM(PERIODS),
155 HW_PARAM(BUFFER_TIME),
156 HW_PARAM(BUFFER_SIZE),
157 HW_PARAM(BUFFER_BYTES),
158 HW_PARAM(TICK_TIME),
159 };
160 #endif
161
162 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
163 struct snd_pcm_hw_params *params)
164 {
165 unsigned int k;
166 struct snd_pcm_hardware *hw;
167 struct snd_interval *i = NULL;
168 struct snd_mask *m = NULL;
169 struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
170 unsigned int rstamps[constrs->rules_num];
171 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
172 unsigned int stamp = 2;
173 int changed, again;
174
175 params->info = 0;
176 params->fifo_size = 0;
177 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
178 params->msbits = 0;
179 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
180 params->rate_num = 0;
181 params->rate_den = 0;
182 }
183
184 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
185 m = hw_param_mask(params, k);
186 if (snd_mask_empty(m))
187 return -EINVAL;
188 if (!(params->rmask & (1 << k)))
189 continue;
190 #ifdef RULES_DEBUG
191 printk("%s = ", snd_pcm_hw_param_names[k]);
192 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
193 #endif
194 changed = snd_mask_refine(m, constrs_mask(constrs, k));
195 #ifdef RULES_DEBUG
196 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
197 #endif
198 if (changed)
199 params->cmask |= 1 << k;
200 if (changed < 0)
201 return changed;
202 }
203
204 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
205 i = hw_param_interval(params, k);
206 if (snd_interval_empty(i))
207 return -EINVAL;
208 if (!(params->rmask & (1 << k)))
209 continue;
210 #ifdef RULES_DEBUG
211 printk("%s = ", snd_pcm_hw_param_names[k]);
212 if (i->empty)
213 printk("empty");
214 else
215 printk("%c%u %u%c",
216 i->openmin ? '(' : '[', i->min,
217 i->max, i->openmax ? ')' : ']');
218 printk(" -> ");
219 #endif
220 changed = snd_interval_refine(i, constrs_interval(constrs, k));
221 #ifdef RULES_DEBUG
222 if (i->empty)
223 printk("empty\n");
224 else
225 printk("%c%u %u%c\n",
226 i->openmin ? '(' : '[', i->min,
227 i->max, i->openmax ? ')' : ']');
228 #endif
229 if (changed)
230 params->cmask |= 1 << k;
231 if (changed < 0)
232 return changed;
233 }
234
235 for (k = 0; k < constrs->rules_num; k++)
236 rstamps[k] = 0;
237 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
238 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
239 do {
240 again = 0;
241 for (k = 0; k < constrs->rules_num; k++) {
242 struct snd_pcm_hw_rule *r = &constrs->rules[k];
243 unsigned int d;
244 int doit = 0;
245 if (r->cond && !(r->cond & params->flags))
246 continue;
247 for (d = 0; r->deps[d] >= 0; d++) {
248 if (vstamps[r->deps[d]] > rstamps[k]) {
249 doit = 1;
250 break;
251 }
252 }
253 if (!doit)
254 continue;
255 #ifdef RULES_DEBUG
256 printk("Rule %d [%p]: ", k, r->func);
257 if (r->var >= 0) {
258 printk("%s = ", snd_pcm_hw_param_names[r->var]);
259 if (hw_is_mask(r->var)) {
260 m = hw_param_mask(params, r->var);
261 printk("%x", *m->bits);
262 } else {
263 i = hw_param_interval(params, r->var);
264 if (i->empty)
265 printk("empty");
266 else
267 printk("%c%u %u%c",
268 i->openmin ? '(' : '[', i->min,
269 i->max, i->openmax ? ')' : ']');
270 }
271 }
272 #endif
273 changed = r->func(params, r);
274 #ifdef RULES_DEBUG
275 if (r->var >= 0) {
276 printk(" -> ");
277 if (hw_is_mask(r->var))
278 printk("%x", *m->bits);
279 else {
280 if (i->empty)
281 printk("empty");
282 else
283 printk("%c%u %u%c",
284 i->openmin ? '(' : '[', i->min,
285 i->max, i->openmax ? ')' : ']');
286 }
287 }
288 printk("\n");
289 #endif
290 rstamps[k] = stamp;
291 if (changed && r->var >= 0) {
292 params->cmask |= (1 << r->var);
293 vstamps[r->var] = stamp;
294 again = 1;
295 }
296 if (changed < 0)
297 return changed;
298 stamp++;
299 }
300 } while (again);
301 if (!params->msbits) {
302 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
303 if (snd_interval_single(i))
304 params->msbits = snd_interval_value(i);
305 }
306
307 if (!params->rate_den) {
308 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
309 if (snd_interval_single(i)) {
310 params->rate_num = snd_interval_value(i);
311 params->rate_den = 1;
312 }
313 }
314
315 hw = &substream->runtime->hw;
316 if (!params->info)
317 params->info = hw->info;
318 if (!params->fifo_size)
319 params->fifo_size = hw->fifo_size;
320 params->rmask = 0;
321 return 0;
322 }
323
324 EXPORT_SYMBOL(snd_pcm_hw_refine);
325
326 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
327 struct snd_pcm_hw_params __user * _params)
328 {
329 struct snd_pcm_hw_params *params;
330 int err;
331
332 params = kmalloc(sizeof(*params), GFP_KERNEL);
333 if (!params) {
334 err = -ENOMEM;
335 goto out;
336 }
337 if (copy_from_user(params, _params, sizeof(*params))) {
338 err = -EFAULT;
339 goto out;
340 }
341 err = snd_pcm_hw_refine(substream, params);
342 if (copy_to_user(_params, params, sizeof(*params))) {
343 if (!err)
344 err = -EFAULT;
345 }
346 out:
347 kfree(params);
348 return err;
349 }
350
351 static int period_to_usecs(struct snd_pcm_runtime *runtime)
352 {
353 int usecs;
354
355 if (! runtime->rate)
356 return -1; /* invalid */
357
358 /* take 75% of period time as the deadline */
359 usecs = (750000 / runtime->rate) * runtime->period_size;
360 usecs += ((750000 % runtime->rate) * runtime->period_size) /
361 runtime->rate;
362
363 return usecs;
364 }
365
366 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
367 struct snd_pcm_hw_params *params)
368 {
369 struct snd_pcm_runtime *runtime;
370 int err, usecs;
371 unsigned int bits;
372 snd_pcm_uframes_t frames;
373
374 snd_assert(substream != NULL, return -ENXIO);
375 runtime = substream->runtime;
376 snd_assert(runtime != NULL, return -ENXIO);
377 snd_pcm_stream_lock_irq(substream);
378 switch (runtime->status->state) {
379 case SNDRV_PCM_STATE_OPEN:
380 case SNDRV_PCM_STATE_SETUP:
381 case SNDRV_PCM_STATE_PREPARED:
382 break;
383 default:
384 snd_pcm_stream_unlock_irq(substream);
385 return -EBADFD;
386 }
387 snd_pcm_stream_unlock_irq(substream);
388 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
389 if (!substream->oss.oss)
390 #endif
391 if (atomic_read(&substream->mmap_count))
392 return -EBADFD;
393
394 params->rmask = ~0U;
395 err = snd_pcm_hw_refine(substream, params);
396 if (err < 0)
397 goto _error;
398
399 err = snd_pcm_hw_params_choose(substream, params);
400 if (err < 0)
401 goto _error;
402
403 if (substream->ops->hw_params != NULL) {
404 err = substream->ops->hw_params(substream, params);
405 if (err < 0)
406 goto _error;
407 }
408
409 runtime->access = params_access(params);
410 runtime->format = params_format(params);
411 runtime->subformat = params_subformat(params);
412 runtime->channels = params_channels(params);
413 runtime->rate = params_rate(params);
414 runtime->period_size = params_period_size(params);
415 runtime->periods = params_periods(params);
416 runtime->buffer_size = params_buffer_size(params);
417 runtime->tick_time = params_tick_time(params);
418 runtime->info = params->info;
419 runtime->rate_num = params->rate_num;
420 runtime->rate_den = params->rate_den;
421
422 bits = snd_pcm_format_physical_width(runtime->format);
423 runtime->sample_bits = bits;
424 bits *= runtime->channels;
425 runtime->frame_bits = bits;
426 frames = 1;
427 while (bits % 8 != 0) {
428 bits *= 2;
429 frames *= 2;
430 }
431 runtime->byte_align = bits / 8;
432 runtime->min_align = frames;
433
434 /* Default sw params */
435 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
436 runtime->period_step = 1;
437 runtime->sleep_min = 0;
438 runtime->control->avail_min = runtime->period_size;
439 runtime->xfer_align = runtime->period_size;
440 runtime->start_threshold = 1;
441 runtime->stop_threshold = runtime->buffer_size;
442 runtime->silence_threshold = 0;
443 runtime->silence_size = 0;
444 runtime->boundary = runtime->buffer_size;
445 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
446 runtime->boundary *= 2;
447
448 snd_pcm_timer_resolution_change(substream);
449 runtime->status->state = SNDRV_PCM_STATE_SETUP;
450
451 remove_acceptable_latency(substream->latency_id);
452 if ((usecs = period_to_usecs(runtime)) >= 0)
453 set_acceptable_latency(substream->latency_id, usecs);
454 return 0;
455 _error:
456 /* hardware might be unuseable from this time,
457 so we force application to retry to set
458 the correct hardware parameter settings */
459 runtime->status->state = SNDRV_PCM_STATE_OPEN;
460 if (substream->ops->hw_free != NULL)
461 substream->ops->hw_free(substream);
462 return err;
463 }
464
465 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
466 struct snd_pcm_hw_params __user * _params)
467 {
468 struct snd_pcm_hw_params *params;
469 int err;
470
471 params = kmalloc(sizeof(*params), GFP_KERNEL);
472 if (!params) {
473 err = -ENOMEM;
474 goto out;
475 }
476 if (copy_from_user(params, _params, sizeof(*params))) {
477 err = -EFAULT;
478 goto out;
479 }
480 err = snd_pcm_hw_params(substream, params);
481 if (copy_to_user(_params, params, sizeof(*params))) {
482 if (!err)
483 err = -EFAULT;
484 }
485 out:
486 kfree(params);
487 return err;
488 }
489
490 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
491 {
492 struct snd_pcm_runtime *runtime;
493 int result = 0;
494
495 snd_assert(substream != NULL, return -ENXIO);
496 runtime = substream->runtime;
497 snd_assert(runtime != NULL, return -ENXIO);
498 snd_pcm_stream_lock_irq(substream);
499 switch (runtime->status->state) {
500 case SNDRV_PCM_STATE_SETUP:
501 case SNDRV_PCM_STATE_PREPARED:
502 break;
503 default:
504 snd_pcm_stream_unlock_irq(substream);
505 return -EBADFD;
506 }
507 snd_pcm_stream_unlock_irq(substream);
508 if (atomic_read(&substream->mmap_count))
509 return -EBADFD;
510 if (substream->ops->hw_free)
511 result = substream->ops->hw_free(substream);
512 runtime->status->state = SNDRV_PCM_STATE_OPEN;
513 remove_acceptable_latency(substream->latency_id);
514 return result;
515 }
516
517 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
518 struct snd_pcm_sw_params *params)
519 {
520 struct snd_pcm_runtime *runtime;
521
522 snd_assert(substream != NULL, return -ENXIO);
523 runtime = substream->runtime;
524 snd_assert(runtime != NULL, return -ENXIO);
525 snd_pcm_stream_lock_irq(substream);
526 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
527 snd_pcm_stream_unlock_irq(substream);
528 return -EBADFD;
529 }
530 snd_pcm_stream_unlock_irq(substream);
531
532 if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
533 return -EINVAL;
534 if (params->avail_min == 0)
535 return -EINVAL;
536 if (params->xfer_align == 0 ||
537 params->xfer_align % runtime->min_align != 0)
538 return -EINVAL;
539 if (params->silence_size >= runtime->boundary) {
540 if (params->silence_threshold != 0)
541 return -EINVAL;
542 } else {
543 if (params->silence_size > params->silence_threshold)
544 return -EINVAL;
545 if (params->silence_threshold > runtime->buffer_size)
546 return -EINVAL;
547 }
548 snd_pcm_stream_lock_irq(substream);
549 runtime->tstamp_mode = params->tstamp_mode;
550 runtime->sleep_min = params->sleep_min;
551 runtime->period_step = params->period_step;
552 runtime->control->avail_min = params->avail_min;
553 runtime->start_threshold = params->start_threshold;
554 runtime->stop_threshold = params->stop_threshold;
555 runtime->silence_threshold = params->silence_threshold;
556 runtime->silence_size = params->silence_size;
557 runtime->xfer_align = params->xfer_align;
558 params->boundary = runtime->boundary;
559 if (snd_pcm_running(substream)) {
560 if (runtime->sleep_min)
561 snd_pcm_tick_prepare(substream);
562 else
563 snd_pcm_tick_set(substream, 0);
564 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
565 runtime->silence_size > 0)
566 snd_pcm_playback_silence(substream, ULONG_MAX);
567 wake_up(&runtime->sleep);
568 }
569 snd_pcm_stream_unlock_irq(substream);
570 return 0;
571 }
572
573 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
574 struct snd_pcm_sw_params __user * _params)
575 {
576 struct snd_pcm_sw_params params;
577 int err;
578 if (copy_from_user(&params, _params, sizeof(params)))
579 return -EFAULT;
580 err = snd_pcm_sw_params(substream, &params);
581 if (copy_to_user(_params, &params, sizeof(params)))
582 return -EFAULT;
583 return err;
584 }
585
586 int snd_pcm_status(struct snd_pcm_substream *substream,
587 struct snd_pcm_status *status)
588 {
589 struct snd_pcm_runtime *runtime = substream->runtime;
590
591 snd_pcm_stream_lock_irq(substream);
592 status->state = runtime->status->state;
593 status->suspended_state = runtime->status->suspended_state;
594 if (status->state == SNDRV_PCM_STATE_OPEN)
595 goto _end;
596 status->trigger_tstamp = runtime->trigger_tstamp;
597 if (snd_pcm_running(substream)) {
598 snd_pcm_update_hw_ptr(substream);
599 if (runtime->tstamp_mode & SNDRV_PCM_TSTAMP_MMAP)
600 status->tstamp = runtime->status->tstamp;
601 else
602 getnstimeofday(&status->tstamp);
603 } else
604 getnstimeofday(&status->tstamp);
605 status->appl_ptr = runtime->control->appl_ptr;
606 status->hw_ptr = runtime->status->hw_ptr;
607 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
608 status->avail = snd_pcm_playback_avail(runtime);
609 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
610 runtime->status->state == SNDRV_PCM_STATE_DRAINING)
611 status->delay = runtime->buffer_size - status->avail;
612 else
613 status->delay = 0;
614 } else {
615 status->avail = snd_pcm_capture_avail(runtime);
616 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
617 status->delay = status->avail;
618 else
619 status->delay = 0;
620 }
621 status->avail_max = runtime->avail_max;
622 status->overrange = runtime->overrange;
623 runtime->avail_max = 0;
624 runtime->overrange = 0;
625 _end:
626 snd_pcm_stream_unlock_irq(substream);
627 return 0;
628 }
629
630 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
631 struct snd_pcm_status __user * _status)
632 {
633 struct snd_pcm_status status;
634 struct snd_pcm_runtime *runtime;
635 int res;
636
637 snd_assert(substream != NULL, return -ENXIO);
638 runtime = substream->runtime;
639 memset(&status, 0, sizeof(status));
640 res = snd_pcm_status(substream, &status);
641 if (res < 0)
642 return res;
643 if (copy_to_user(_status, &status, sizeof(status)))
644 return -EFAULT;
645 return 0;
646 }
647
648 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
649 struct snd_pcm_channel_info * info)
650 {
651 struct snd_pcm_runtime *runtime;
652 unsigned int channel;
653
654 snd_assert(substream != NULL, return -ENXIO);
655 channel = info->channel;
656 runtime = substream->runtime;
657 snd_pcm_stream_lock_irq(substream);
658 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
659 snd_pcm_stream_unlock_irq(substream);
660 return -EBADFD;
661 }
662 snd_pcm_stream_unlock_irq(substream);
663 if (channel >= runtime->channels)
664 return -EINVAL;
665 memset(info, 0, sizeof(*info));
666 info->channel = channel;
667 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
668 }
669
670 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
671 struct snd_pcm_channel_info __user * _info)
672 {
673 struct snd_pcm_channel_info info;
674 int res;
675
676 if (copy_from_user(&info, _info, sizeof(info)))
677 return -EFAULT;
678 res = snd_pcm_channel_info(substream, &info);
679 if (res < 0)
680 return res;
681 if (copy_to_user(_info, &info, sizeof(info)))
682 return -EFAULT;
683 return 0;
684 }
685
686 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
687 {
688 struct snd_pcm_runtime *runtime = substream->runtime;
689 if (runtime->trigger_master == NULL)
690 return;
691 if (runtime->trigger_master == substream) {
692 getnstimeofday(&runtime->trigger_tstamp);
693 } else {
694 snd_pcm_trigger_tstamp(runtime->trigger_master);
695 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
696 }
697 runtime->trigger_master = NULL;
698 }
699
700 struct action_ops {
701 int (*pre_action)(struct snd_pcm_substream *substream, int state);
702 int (*do_action)(struct snd_pcm_substream *substream, int state);
703 void (*undo_action)(struct snd_pcm_substream *substream, int state);
704 void (*post_action)(struct snd_pcm_substream *substream, int state);
705 };
706
707 /*
708 * this functions is core for handling of linked stream
709 * Note: the stream state might be changed also on failure
710 * Note2: call with calling stream lock + link lock
711 */
712 static int snd_pcm_action_group(struct action_ops *ops,
713 struct snd_pcm_substream *substream,
714 int state, int do_lock)
715 {
716 struct list_head *pos;
717 struct snd_pcm_substream *s = NULL;
718 struct snd_pcm_substream *s1;
719 int res = 0;
720
721 snd_pcm_group_for_each(pos, substream) {
722 s = snd_pcm_group_substream_entry(pos);
723 if (do_lock && s != substream)
724 spin_lock(&s->self_group.lock);
725 res = ops->pre_action(s, state);
726 if (res < 0)
727 goto _unlock;
728 }
729 snd_pcm_group_for_each(pos, substream) {
730 s = snd_pcm_group_substream_entry(pos);
731 res = ops->do_action(s, state);
732 if (res < 0) {
733 if (ops->undo_action) {
734 snd_pcm_group_for_each(pos, substream) {
735 s1 = snd_pcm_group_substream_entry(pos);
736 if (s1 == s) /* failed stream */
737 break;
738 ops->undo_action(s1, state);
739 }
740 }
741 s = NULL; /* unlock all */
742 goto _unlock;
743 }
744 }
745 snd_pcm_group_for_each(pos, substream) {
746 s = snd_pcm_group_substream_entry(pos);
747 ops->post_action(s, state);
748 }
749 _unlock:
750 if (do_lock) {
751 /* unlock streams */
752 snd_pcm_group_for_each(pos, substream) {
753 s1 = snd_pcm_group_substream_entry(pos);
754 if (s1 != substream)
755 spin_unlock(&s1->self_group.lock);
756 if (s1 == s) /* end */
757 break;
758 }
759 }
760 return res;
761 }
762
763 /*
764 * Note: call with stream lock
765 */
766 static int snd_pcm_action_single(struct action_ops *ops,
767 struct snd_pcm_substream *substream,
768 int state)
769 {
770 int res;
771
772 res = ops->pre_action(substream, state);
773 if (res < 0)
774 return res;
775 res = ops->do_action(substream, state);
776 if (res == 0)
777 ops->post_action(substream, state);
778 else if (ops->undo_action)
779 ops->undo_action(substream, state);
780 return res;
781 }
782
783 /*
784 * Note: call with stream lock
785 */
786 static int snd_pcm_action(struct action_ops *ops,
787 struct snd_pcm_substream *substream,
788 int state)
789 {
790 int res;
791
792 if (snd_pcm_stream_linked(substream)) {
793 if (!spin_trylock(&substream->group->lock)) {
794 spin_unlock(&substream->self_group.lock);
795 spin_lock(&substream->group->lock);
796 spin_lock(&substream->self_group.lock);
797 }
798 res = snd_pcm_action_group(ops, substream, state, 1);
799 spin_unlock(&substream->group->lock);
800 } else {
801 res = snd_pcm_action_single(ops, substream, state);
802 }
803 return res;
804 }
805
806 /*
807 * Note: don't use any locks before
808 */
809 static int snd_pcm_action_lock_irq(struct action_ops *ops,
810 struct snd_pcm_substream *substream,
811 int state)
812 {
813 int res;
814
815 read_lock_irq(&snd_pcm_link_rwlock);
816 if (snd_pcm_stream_linked(substream)) {
817 spin_lock(&substream->group->lock);
818 spin_lock(&substream->self_group.lock);
819 res = snd_pcm_action_group(ops, substream, state, 1);
820 spin_unlock(&substream->self_group.lock);
821 spin_unlock(&substream->group->lock);
822 } else {
823 spin_lock(&substream->self_group.lock);
824 res = snd_pcm_action_single(ops, substream, state);
825 spin_unlock(&substream->self_group.lock);
826 }
827 read_unlock_irq(&snd_pcm_link_rwlock);
828 return res;
829 }
830
831 /*
832 */
833 static int snd_pcm_action_nonatomic(struct action_ops *ops,
834 struct snd_pcm_substream *substream,
835 int state)
836 {
837 int res;
838
839 down_read(&snd_pcm_link_rwsem);
840 if (snd_pcm_stream_linked(substream))
841 res = snd_pcm_action_group(ops, substream, state, 0);
842 else
843 res = snd_pcm_action_single(ops, substream, state);
844 up_read(&snd_pcm_link_rwsem);
845 return res;
846 }
847
848 /*
849 * start callbacks
850 */
851 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
852 {
853 struct snd_pcm_runtime *runtime = substream->runtime;
854 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
855 return -EBADFD;
856 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
857 !snd_pcm_playback_data(substream))
858 return -EPIPE;
859 runtime->trigger_master = substream;
860 return 0;
861 }
862
863 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
864 {
865 if (substream->runtime->trigger_master != substream)
866 return 0;
867 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
868 }
869
870 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
871 {
872 if (substream->runtime->trigger_master == substream)
873 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
874 }
875
876 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
877 {
878 struct snd_pcm_runtime *runtime = substream->runtime;
879 snd_pcm_trigger_tstamp(substream);
880 runtime->status->state = state;
881 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
882 runtime->silence_size > 0)
883 snd_pcm_playback_silence(substream, ULONG_MAX);
884 if (runtime->sleep_min)
885 snd_pcm_tick_prepare(substream);
886 if (substream->timer)
887 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
888 &runtime->trigger_tstamp);
889 }
890
891 static struct action_ops snd_pcm_action_start = {
892 .pre_action = snd_pcm_pre_start,
893 .do_action = snd_pcm_do_start,
894 .undo_action = snd_pcm_undo_start,
895 .post_action = snd_pcm_post_start
896 };
897
898 /**
899 * snd_pcm_start
900 * @substream: the PCM substream instance
901 *
902 * Start all linked streams.
903 */
904 int snd_pcm_start(struct snd_pcm_substream *substream)
905 {
906 return snd_pcm_action(&snd_pcm_action_start, substream,
907 SNDRV_PCM_STATE_RUNNING);
908 }
909
910 /*
911 * stop callbacks
912 */
913 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
914 {
915 struct snd_pcm_runtime *runtime = substream->runtime;
916 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
917 return -EBADFD;
918 runtime->trigger_master = substream;
919 return 0;
920 }
921
922 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
923 {
924 if (substream->runtime->trigger_master == substream &&
925 snd_pcm_running(substream))
926 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
927 return 0; /* unconditonally stop all substreams */
928 }
929
930 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
931 {
932 struct snd_pcm_runtime *runtime = substream->runtime;
933 if (runtime->status->state != state) {
934 snd_pcm_trigger_tstamp(substream);
935 if (substream->timer)
936 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
937 &runtime->trigger_tstamp);
938 runtime->status->state = state;
939 snd_pcm_tick_set(substream, 0);
940 }
941 wake_up(&runtime->sleep);
942 }
943
944 static struct action_ops snd_pcm_action_stop = {
945 .pre_action = snd_pcm_pre_stop,
946 .do_action = snd_pcm_do_stop,
947 .post_action = snd_pcm_post_stop
948 };
949
950 /**
951 * snd_pcm_stop
952 * @substream: the PCM substream instance
953 * @state: PCM state after stopping the stream
954 *
955 * Try to stop all running streams in the substream group.
956 * The state of each stream is changed to the given value after that unconditionally.
957 */
958 int snd_pcm_stop(struct snd_pcm_substream *substream, int state)
959 {
960 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
961 }
962
963 EXPORT_SYMBOL(snd_pcm_stop);
964
965 /**
966 * snd_pcm_drain_done
967 * @substream: the PCM substream
968 *
969 * Stop the DMA only when the given stream is playback.
970 * The state is changed to SETUP.
971 * Unlike snd_pcm_stop(), this affects only the given stream.
972 */
973 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
974 {
975 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
976 SNDRV_PCM_STATE_SETUP);
977 }
978
979 /*
980 * pause callbacks
981 */
982 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
983 {
984 struct snd_pcm_runtime *runtime = substream->runtime;
985 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
986 return -ENOSYS;
987 if (push) {
988 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
989 return -EBADFD;
990 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
991 return -EBADFD;
992 runtime->trigger_master = substream;
993 return 0;
994 }
995
996 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
997 {
998 if (substream->runtime->trigger_master != substream)
999 return 0;
1000 return substream->ops->trigger(substream,
1001 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1002 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1003 }
1004
1005 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1006 {
1007 if (substream->runtime->trigger_master == substream)
1008 substream->ops->trigger(substream,
1009 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1010 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1011 }
1012
1013 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1014 {
1015 struct snd_pcm_runtime *runtime = substream->runtime;
1016 snd_pcm_trigger_tstamp(substream);
1017 if (push) {
1018 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1019 if (substream->timer)
1020 snd_timer_notify(substream->timer,
1021 SNDRV_TIMER_EVENT_MPAUSE,
1022 &runtime->trigger_tstamp);
1023 snd_pcm_tick_set(substream, 0);
1024 wake_up(&runtime->sleep);
1025 } else {
1026 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1027 if (runtime->sleep_min)
1028 snd_pcm_tick_prepare(substream);
1029 if (substream->timer)
1030 snd_timer_notify(substream->timer,
1031 SNDRV_TIMER_EVENT_MCONTINUE,
1032 &runtime->trigger_tstamp);
1033 }
1034 }
1035
1036 static struct action_ops snd_pcm_action_pause = {
1037 .pre_action = snd_pcm_pre_pause,
1038 .do_action = snd_pcm_do_pause,
1039 .undo_action = snd_pcm_undo_pause,
1040 .post_action = snd_pcm_post_pause
1041 };
1042
1043 /*
1044 * Push/release the pause for all linked streams.
1045 */
1046 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1047 {
1048 return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1049 }
1050
1051 #ifdef CONFIG_PM
1052 /* suspend */
1053
1054 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1055 {
1056 struct snd_pcm_runtime *runtime = substream->runtime;
1057 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1058 return -EBUSY;
1059 runtime->trigger_master = substream;
1060 return 0;
1061 }
1062
1063 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1064 {
1065 struct snd_pcm_runtime *runtime = substream->runtime;
1066 if (runtime->trigger_master != substream)
1067 return 0;
1068 if (! snd_pcm_running(substream))
1069 return 0;
1070 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1071 return 0; /* suspend unconditionally */
1072 }
1073
1074 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1075 {
1076 struct snd_pcm_runtime *runtime = substream->runtime;
1077 snd_pcm_trigger_tstamp(substream);
1078 if (substream->timer)
1079 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1080 &runtime->trigger_tstamp);
1081 runtime->status->suspended_state = runtime->status->state;
1082 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1083 snd_pcm_tick_set(substream, 0);
1084 wake_up(&runtime->sleep);
1085 }
1086
1087 static struct action_ops snd_pcm_action_suspend = {
1088 .pre_action = snd_pcm_pre_suspend,
1089 .do_action = snd_pcm_do_suspend,
1090 .post_action = snd_pcm_post_suspend
1091 };
1092
1093 /**
1094 * snd_pcm_suspend
1095 * @substream: the PCM substream
1096 *
1097 * Trigger SUSPEND to all linked streams.
1098 * After this call, all streams are changed to SUSPENDED state.
1099 */
1100 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1101 {
1102 int err;
1103 unsigned long flags;
1104
1105 if (! substream)
1106 return 0;
1107
1108 snd_pcm_stream_lock_irqsave(substream, flags);
1109 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1110 snd_pcm_stream_unlock_irqrestore(substream, flags);
1111 return err;
1112 }
1113
1114 EXPORT_SYMBOL(snd_pcm_suspend);
1115
1116 /**
1117 * snd_pcm_suspend_all
1118 * @pcm: the PCM instance
1119 *
1120 * Trigger SUSPEND to all substreams in the given pcm.
1121 * After this call, all streams are changed to SUSPENDED state.
1122 */
1123 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1124 {
1125 struct snd_pcm_substream *substream;
1126 int stream, err = 0;
1127
1128 if (! pcm)
1129 return 0;
1130
1131 for (stream = 0; stream < 2; stream++) {
1132 for (substream = pcm->streams[stream].substream;
1133 substream; substream = substream->next) {
1134 /* FIXME: the open/close code should lock this as well */
1135 if (substream->runtime == NULL)
1136 continue;
1137 err = snd_pcm_suspend(substream);
1138 if (err < 0 && err != -EBUSY)
1139 return err;
1140 }
1141 }
1142 return 0;
1143 }
1144
1145 EXPORT_SYMBOL(snd_pcm_suspend_all);
1146
1147 /* resume */
1148
1149 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1150 {
1151 struct snd_pcm_runtime *runtime = substream->runtime;
1152 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1153 return -ENOSYS;
1154 runtime->trigger_master = substream;
1155 return 0;
1156 }
1157
1158 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1159 {
1160 struct snd_pcm_runtime *runtime = substream->runtime;
1161 if (runtime->trigger_master != substream)
1162 return 0;
1163 /* DMA not running previously? */
1164 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1165 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1166 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1167 return 0;
1168 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1169 }
1170
1171 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1172 {
1173 if (substream->runtime->trigger_master == substream &&
1174 snd_pcm_running(substream))
1175 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1176 }
1177
1178 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1179 {
1180 struct snd_pcm_runtime *runtime = substream->runtime;
1181 snd_pcm_trigger_tstamp(substream);
1182 if (substream->timer)
1183 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1184 &runtime->trigger_tstamp);
1185 runtime->status->state = runtime->status->suspended_state;
1186 if (runtime->sleep_min)
1187 snd_pcm_tick_prepare(substream);
1188 }
1189
1190 static struct action_ops snd_pcm_action_resume = {
1191 .pre_action = snd_pcm_pre_resume,
1192 .do_action = snd_pcm_do_resume,
1193 .undo_action = snd_pcm_undo_resume,
1194 .post_action = snd_pcm_post_resume
1195 };
1196
1197 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1198 {
1199 struct snd_card *card = substream->pcm->card;
1200 int res;
1201
1202 snd_power_lock(card);
1203 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1204 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1205 snd_power_unlock(card);
1206 return res;
1207 }
1208
1209 #else
1210
1211 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1212 {
1213 return -ENOSYS;
1214 }
1215
1216 #endif /* CONFIG_PM */
1217
1218 /*
1219 * xrun ioctl
1220 *
1221 * Change the RUNNING stream(s) to XRUN state.
1222 */
1223 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1224 {
1225 struct snd_card *card = substream->pcm->card;
1226 struct snd_pcm_runtime *runtime = substream->runtime;
1227 int result;
1228
1229 snd_power_lock(card);
1230 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1231 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1232 if (result < 0)
1233 goto _unlock;
1234 }
1235
1236 snd_pcm_stream_lock_irq(substream);
1237 switch (runtime->status->state) {
1238 case SNDRV_PCM_STATE_XRUN:
1239 result = 0; /* already there */
1240 break;
1241 case SNDRV_PCM_STATE_RUNNING:
1242 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1243 break;
1244 default:
1245 result = -EBADFD;
1246 }
1247 snd_pcm_stream_unlock_irq(substream);
1248 _unlock:
1249 snd_power_unlock(card);
1250 return result;
1251 }
1252
1253 /*
1254 * reset ioctl
1255 */
1256 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1257 {
1258 struct snd_pcm_runtime *runtime = substream->runtime;
1259 switch (runtime->status->state) {
1260 case SNDRV_PCM_STATE_RUNNING:
1261 case SNDRV_PCM_STATE_PREPARED:
1262 case SNDRV_PCM_STATE_PAUSED:
1263 case SNDRV_PCM_STATE_SUSPENDED:
1264 return 0;
1265 default:
1266 return -EBADFD;
1267 }
1268 }
1269
1270 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1271 {
1272 struct snd_pcm_runtime *runtime = substream->runtime;
1273 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1274 if (err < 0)
1275 return err;
1276 // snd_assert(runtime->status->hw_ptr < runtime->buffer_size, );
1277 runtime->hw_ptr_base = 0;
1278 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1279 runtime->status->hw_ptr % runtime->period_size;
1280 runtime->silence_start = runtime->status->hw_ptr;
1281 runtime->silence_filled = 0;
1282 return 0;
1283 }
1284
1285 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1286 {
1287 struct snd_pcm_runtime *runtime = substream->runtime;
1288 runtime->control->appl_ptr = runtime->status->hw_ptr;
1289 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1290 runtime->silence_size > 0)
1291 snd_pcm_playback_silence(substream, ULONG_MAX);
1292 }
1293
1294 static struct action_ops snd_pcm_action_reset = {
1295 .pre_action = snd_pcm_pre_reset,
1296 .do_action = snd_pcm_do_reset,
1297 .post_action = snd_pcm_post_reset
1298 };
1299
1300 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1301 {
1302 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1303 }
1304
1305 /*
1306 * prepare ioctl
1307 */
1308 /* we use the second argument for updating f_flags */
1309 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1310 int f_flags)
1311 {
1312 struct snd_pcm_runtime *runtime = substream->runtime;
1313 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1314 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1315 return -EBADFD;
1316 if (snd_pcm_running(substream))
1317 return -EBUSY;
1318 substream->f_flags = f_flags;
1319 return 0;
1320 }
1321
1322 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1323 {
1324 int err;
1325 err = substream->ops->prepare(substream);
1326 if (err < 0)
1327 return err;
1328 return snd_pcm_do_reset(substream, 0);
1329 }
1330
1331 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1332 {
1333 struct snd_pcm_runtime *runtime = substream->runtime;
1334 runtime->control->appl_ptr = runtime->status->hw_ptr;
1335 runtime->status->state = SNDRV_PCM_STATE_PREPARED;
1336 }
1337
1338 static struct action_ops snd_pcm_action_prepare = {
1339 .pre_action = snd_pcm_pre_prepare,
1340 .do_action = snd_pcm_do_prepare,
1341 .post_action = snd_pcm_post_prepare
1342 };
1343
1344 /**
1345 * snd_pcm_prepare
1346 * @substream: the PCM substream instance
1347 * @file: file to refer f_flags
1348 *
1349 * Prepare the PCM substream to be triggerable.
1350 */
1351 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1352 struct file *file)
1353 {
1354 int res;
1355 struct snd_card *card = substream->pcm->card;
1356 int f_flags;
1357
1358 if (file)
1359 f_flags = file->f_flags;
1360 else
1361 f_flags = substream->f_flags;
1362
1363 snd_power_lock(card);
1364 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1365 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1366 substream, f_flags);
1367 snd_power_unlock(card);
1368 return res;
1369 }
1370
1371 /*
1372 * drain ioctl
1373 */
1374
1375 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1376 {
1377 if (substream->f_flags & O_NONBLOCK)
1378 return -EAGAIN;
1379 substream->runtime->trigger_master = substream;
1380 return 0;
1381 }
1382
1383 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1384 {
1385 struct snd_pcm_runtime *runtime = substream->runtime;
1386 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1387 switch (runtime->status->state) {
1388 case SNDRV_PCM_STATE_PREPARED:
1389 /* start playback stream if possible */
1390 if (! snd_pcm_playback_empty(substream)) {
1391 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1392 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1393 }
1394 break;
1395 case SNDRV_PCM_STATE_RUNNING:
1396 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1397 break;
1398 default:
1399 break;
1400 }
1401 } else {
1402 /* stop running stream */
1403 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1404 int state = snd_pcm_capture_avail(runtime) > 0 ?
1405 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1406 snd_pcm_do_stop(substream, state);
1407 snd_pcm_post_stop(substream, state);
1408 }
1409 }
1410 return 0;
1411 }
1412
1413 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1414 {
1415 }
1416
1417 static struct action_ops snd_pcm_action_drain_init = {
1418 .pre_action = snd_pcm_pre_drain_init,
1419 .do_action = snd_pcm_do_drain_init,
1420 .post_action = snd_pcm_post_drain_init
1421 };
1422
1423 struct drain_rec {
1424 struct snd_pcm_substream *substream;
1425 wait_queue_t wait;
1426 snd_pcm_uframes_t stop_threshold;
1427 };
1428
1429 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1430
1431 /*
1432 * Drain the stream(s).
1433 * When the substream is linked, sync until the draining of all playback streams
1434 * is finished.
1435 * After this call, all streams are supposed to be either SETUP or DRAINING
1436 * (capture only) state.
1437 */
1438 static int snd_pcm_drain(struct snd_pcm_substream *substream)
1439 {
1440 struct snd_card *card;
1441 struct snd_pcm_runtime *runtime;
1442 struct list_head *pos;
1443 int result = 0;
1444 int i, num_drecs;
1445 struct drain_rec *drec, drec_tmp, *d;
1446
1447 snd_assert(substream != NULL, return -ENXIO);
1448 card = substream->pcm->card;
1449 runtime = substream->runtime;
1450
1451 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1452 return -EBADFD;
1453
1454 snd_power_lock(card);
1455 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1456 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1457 if (result < 0) {
1458 snd_power_unlock(card);
1459 return result;
1460 }
1461 }
1462
1463 /* allocate temporary record for drain sync */
1464 down_read(&snd_pcm_link_rwsem);
1465 if (snd_pcm_stream_linked(substream)) {
1466 drec = kmalloc(substream->group->count * sizeof(*drec), GFP_KERNEL);
1467 if (! drec) {
1468 up_read(&snd_pcm_link_rwsem);
1469 snd_power_unlock(card);
1470 return -ENOMEM;
1471 }
1472 } else
1473 drec = &drec_tmp;
1474
1475 /* count only playback streams */
1476 num_drecs = 0;
1477 snd_pcm_group_for_each(pos, substream) {
1478 struct snd_pcm_substream *s = snd_pcm_group_substream_entry(pos);
1479 runtime = s->runtime;
1480 if (s->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1481 d = &drec[num_drecs++];
1482 d->substream = s;
1483 init_waitqueue_entry(&d->wait, current);
1484 add_wait_queue(&runtime->sleep, &d->wait);
1485 /* stop_threshold fixup to avoid endless loop when
1486 * stop_threshold > buffer_size
1487 */
1488 d->stop_threshold = runtime->stop_threshold;
1489 if (runtime->stop_threshold > runtime->buffer_size)
1490 runtime->stop_threshold = runtime->buffer_size;
1491 }
1492 }
1493 up_read(&snd_pcm_link_rwsem);
1494
1495 snd_pcm_stream_lock_irq(substream);
1496 /* resume pause */
1497 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1498 snd_pcm_pause(substream, 0);
1499
1500 /* pre-start/stop - all running streams are changed to DRAINING state */
1501 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1502 if (result < 0) {
1503 snd_pcm_stream_unlock_irq(substream);
1504 goto _error;
1505 }
1506
1507 for (;;) {
1508 long tout;
1509 if (signal_pending(current)) {
1510 result = -ERESTARTSYS;
1511 break;
1512 }
1513 /* all finished? */
1514 for (i = 0; i < num_drecs; i++) {
1515 runtime = drec[i].substream->runtime;
1516 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING)
1517 break;
1518 }
1519 if (i == num_drecs)
1520 break; /* yes, all drained */
1521
1522 set_current_state(TASK_INTERRUPTIBLE);
1523 snd_pcm_stream_unlock_irq(substream);
1524 snd_power_unlock(card);
1525 tout = schedule_timeout(10 * HZ);
1526 snd_power_lock(card);
1527 snd_pcm_stream_lock_irq(substream);
1528 if (tout == 0) {
1529 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1530 result = -ESTRPIPE;
1531 else {
1532 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1533 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1534 result = -EIO;
1535 }
1536 break;
1537 }
1538 }
1539
1540 snd_pcm_stream_unlock_irq(substream);
1541
1542 _error:
1543 for (i = 0; i < num_drecs; i++) {
1544 d = &drec[i];
1545 runtime = d->substream->runtime;
1546 remove_wait_queue(&runtime->sleep, &d->wait);
1547 runtime->stop_threshold = d->stop_threshold;
1548 }
1549
1550 if (drec != &drec_tmp)
1551 kfree(drec);
1552 snd_power_unlock(card);
1553
1554 return result;
1555 }
1556
1557 /*
1558 * drop ioctl
1559 *
1560 * Immediately put all linked substreams into SETUP state.
1561 */
1562 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1563 {
1564 struct snd_pcm_runtime *runtime;
1565 struct snd_card *card;
1566 int result = 0;
1567
1568 snd_assert(substream != NULL, return -ENXIO);
1569 runtime = substream->runtime;
1570 card = substream->pcm->card;
1571
1572 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1573 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1574 return -EBADFD;
1575
1576 snd_power_lock(card);
1577 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1578 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1579 if (result < 0)
1580 goto _unlock;
1581 }
1582
1583 snd_pcm_stream_lock_irq(substream);
1584 /* resume pause */
1585 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1586 snd_pcm_pause(substream, 0);
1587
1588 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1589 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1590 snd_pcm_stream_unlock_irq(substream);
1591 _unlock:
1592 snd_power_unlock(card);
1593 return result;
1594 }
1595
1596
1597 /* WARNING: Don't forget to fput back the file */
1598 static struct file *snd_pcm_file_fd(int fd)
1599 {
1600 struct file *file;
1601 struct inode *inode;
1602 unsigned int minor;
1603
1604 file = fget(fd);
1605 if (!file)
1606 return NULL;
1607 inode = file->f_path.dentry->d_inode;
1608 if (!S_ISCHR(inode->i_mode) ||
1609 imajor(inode) != snd_major) {
1610 fput(file);
1611 return NULL;
1612 }
1613 minor = iminor(inode);
1614 if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1615 !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1616 fput(file);
1617 return NULL;
1618 }
1619 return file;
1620 }
1621
1622 /*
1623 * PCM link handling
1624 */
1625 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1626 {
1627 int res = 0;
1628 struct file *file;
1629 struct snd_pcm_file *pcm_file;
1630 struct snd_pcm_substream *substream1;
1631
1632 file = snd_pcm_file_fd(fd);
1633 if (!file)
1634 return -EBADFD;
1635 pcm_file = file->private_data;
1636 substream1 = pcm_file->substream;
1637 down_write(&snd_pcm_link_rwsem);
1638 write_lock_irq(&snd_pcm_link_rwlock);
1639 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1640 substream->runtime->status->state != substream1->runtime->status->state) {
1641 res = -EBADFD;
1642 goto _end;
1643 }
1644 if (snd_pcm_stream_linked(substream1)) {
1645 res = -EALREADY;
1646 goto _end;
1647 }
1648 if (!snd_pcm_stream_linked(substream)) {
1649 substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC);
1650 if (substream->group == NULL) {
1651 res = -ENOMEM;
1652 goto _end;
1653 }
1654 spin_lock_init(&substream->group->lock);
1655 INIT_LIST_HEAD(&substream->group->substreams);
1656 list_add_tail(&substream->link_list, &substream->group->substreams);
1657 substream->group->count = 1;
1658 }
1659 list_add_tail(&substream1->link_list, &substream->group->substreams);
1660 substream->group->count++;
1661 substream1->group = substream->group;
1662 _end:
1663 write_unlock_irq(&snd_pcm_link_rwlock);
1664 up_write(&snd_pcm_link_rwsem);
1665 fput(file);
1666 return res;
1667 }
1668
1669 static void relink_to_local(struct snd_pcm_substream *substream)
1670 {
1671 substream->group = &substream->self_group;
1672 INIT_LIST_HEAD(&substream->self_group.substreams);
1673 list_add_tail(&substream->link_list, &substream->self_group.substreams);
1674 }
1675
1676 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1677 {
1678 struct list_head *pos;
1679 int res = 0;
1680
1681 down_write(&snd_pcm_link_rwsem);
1682 write_lock_irq(&snd_pcm_link_rwlock);
1683 if (!snd_pcm_stream_linked(substream)) {
1684 res = -EALREADY;
1685 goto _end;
1686 }
1687 list_del(&substream->link_list);
1688 substream->group->count--;
1689 if (substream->group->count == 1) { /* detach the last stream, too */
1690 snd_pcm_group_for_each(pos, substream) {
1691 relink_to_local(snd_pcm_group_substream_entry(pos));
1692 break;
1693 }
1694 kfree(substream->group);
1695 }
1696 relink_to_local(substream);
1697 _end:
1698 write_unlock_irq(&snd_pcm_link_rwlock);
1699 up_write(&snd_pcm_link_rwsem);
1700 return res;
1701 }
1702
1703 /*
1704 * hw configurator
1705 */
1706 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1707 struct snd_pcm_hw_rule *rule)
1708 {
1709 struct snd_interval t;
1710 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1711 hw_param_interval_c(params, rule->deps[1]), &t);
1712 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1713 }
1714
1715 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1716 struct snd_pcm_hw_rule *rule)
1717 {
1718 struct snd_interval t;
1719 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1720 hw_param_interval_c(params, rule->deps[1]), &t);
1721 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1722 }
1723
1724 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1725 struct snd_pcm_hw_rule *rule)
1726 {
1727 struct snd_interval t;
1728 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1729 hw_param_interval_c(params, rule->deps[1]),
1730 (unsigned long) rule->private, &t);
1731 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1732 }
1733
1734 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1735 struct snd_pcm_hw_rule *rule)
1736 {
1737 struct snd_interval t;
1738 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1739 (unsigned long) rule->private,
1740 hw_param_interval_c(params, rule->deps[1]), &t);
1741 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1742 }
1743
1744 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1745 struct snd_pcm_hw_rule *rule)
1746 {
1747 unsigned int k;
1748 struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1749 struct snd_mask m;
1750 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1751 snd_mask_any(&m);
1752 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1753 int bits;
1754 if (! snd_mask_test(mask, k))
1755 continue;
1756 bits = snd_pcm_format_physical_width(k);
1757 if (bits <= 0)
1758 continue; /* ignore invalid formats */
1759 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1760 snd_mask_reset(&m, k);
1761 }
1762 return snd_mask_refine(mask, &m);
1763 }
1764
1765 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1766 struct snd_pcm_hw_rule *rule)
1767 {
1768 struct snd_interval t;
1769 unsigned int k;
1770 t.min = UINT_MAX;
1771 t.max = 0;
1772 t.openmin = 0;
1773 t.openmax = 0;
1774 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1775 int bits;
1776 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1777 continue;
1778 bits = snd_pcm_format_physical_width(k);
1779 if (bits <= 0)
1780 continue; /* ignore invalid formats */
1781 if (t.min > (unsigned)bits)
1782 t.min = bits;
1783 if (t.max < (unsigned)bits)
1784 t.max = bits;
1785 }
1786 t.integer = 1;
1787 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1788 }
1789
1790 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1791 #error "Change this table"
1792 #endif
1793
1794 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1795 48000, 64000, 88200, 96000, 176400, 192000 };
1796
1797 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1798 struct snd_pcm_hw_rule *rule)
1799 {
1800 struct snd_pcm_hardware *hw = rule->private;
1801 return snd_interval_list(hw_param_interval(params, rule->var),
1802 ARRAY_SIZE(rates), rates, hw->rates);
1803 }
1804
1805 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1806 struct snd_pcm_hw_rule *rule)
1807 {
1808 struct snd_interval t;
1809 struct snd_pcm_substream *substream = rule->private;
1810 t.min = 0;
1811 t.max = substream->buffer_bytes_max;
1812 t.openmin = 0;
1813 t.openmax = 0;
1814 t.integer = 1;
1815 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1816 }
1817
1818 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1819 {
1820 struct snd_pcm_runtime *runtime = substream->runtime;
1821 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1822 int k, err;
1823
1824 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1825 snd_mask_any(constrs_mask(constrs, k));
1826 }
1827
1828 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1829 snd_interval_any(constrs_interval(constrs, k));
1830 }
1831
1832 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1833 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1834 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1835 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1836 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1837
1838 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1839 snd_pcm_hw_rule_format, NULL,
1840 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1841 if (err < 0)
1842 return err;
1843 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1844 snd_pcm_hw_rule_sample_bits, NULL,
1845 SNDRV_PCM_HW_PARAM_FORMAT,
1846 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1847 if (err < 0)
1848 return err;
1849 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1850 snd_pcm_hw_rule_div, NULL,
1851 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1852 if (err < 0)
1853 return err;
1854 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1855 snd_pcm_hw_rule_mul, NULL,
1856 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1857 if (err < 0)
1858 return err;
1859 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1860 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1861 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1862 if (err < 0)
1863 return err;
1864 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1865 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1866 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1867 if (err < 0)
1868 return err;
1869 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1870 snd_pcm_hw_rule_div, NULL,
1871 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1872 if (err < 0)
1873 return err;
1874 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1875 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1876 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1877 if (err < 0)
1878 return err;
1879 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1880 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1881 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1882 if (err < 0)
1883 return err;
1884 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1885 snd_pcm_hw_rule_div, NULL,
1886 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1887 if (err < 0)
1888 return err;
1889 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1890 snd_pcm_hw_rule_div, NULL,
1891 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1892 if (err < 0)
1893 return err;
1894 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1895 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1896 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1897 if (err < 0)
1898 return err;
1899 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1900 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1901 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1902 if (err < 0)
1903 return err;
1904 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1905 snd_pcm_hw_rule_mul, NULL,
1906 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1907 if (err < 0)
1908 return err;
1909 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1910 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1911 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1912 if (err < 0)
1913 return err;
1914 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1915 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1916 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1917 if (err < 0)
1918 return err;
1919 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1920 snd_pcm_hw_rule_muldivk, (void*) 8,
1921 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1922 if (err < 0)
1923 return err;
1924 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1925 snd_pcm_hw_rule_muldivk, (void*) 8,
1926 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1927 if (err < 0)
1928 return err;
1929 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1930 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1931 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1932 if (err < 0)
1933 return err;
1934 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1935 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1936 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1937 if (err < 0)
1938 return err;
1939 return 0;
1940 }
1941
1942 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1943 {
1944 struct snd_pcm_runtime *runtime = substream->runtime;
1945 struct snd_pcm_hardware *hw = &runtime->hw;
1946 int err;
1947 unsigned int mask = 0;
1948
1949 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1950 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1951 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1952 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1953 if (hw->info & SNDRV_PCM_INFO_MMAP) {
1954 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1955 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1956 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1957 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1958 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1959 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1960 }
1961 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1962 snd_assert(err >= 0, return -EINVAL);
1963
1964 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1965 snd_assert(err >= 0, return -EINVAL);
1966
1967 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1968 snd_assert(err >= 0, return -EINVAL);
1969
1970 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1971 hw->channels_min, hw->channels_max);
1972 snd_assert(err >= 0, return -EINVAL);
1973
1974 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1975 hw->rate_min, hw->rate_max);
1976 snd_assert(err >= 0, return -EINVAL);
1977
1978 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1979 hw->period_bytes_min, hw->period_bytes_max);
1980 snd_assert(err >= 0, return -EINVAL);
1981
1982 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1983 hw->periods_min, hw->periods_max);
1984 snd_assert(err >= 0, return -EINVAL);
1985
1986 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1987 hw->period_bytes_min, hw->buffer_bytes_max);
1988 snd_assert(err >= 0, return -EINVAL);
1989
1990 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1991 snd_pcm_hw_rule_buffer_bytes_max, substream,
1992 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1993 if (err < 0)
1994 return err;
1995
1996 /* FIXME: remove */
1997 if (runtime->dma_bytes) {
1998 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
1999 snd_assert(err >= 0, return -EINVAL);
2000 }
2001
2002 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2003 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2004 snd_pcm_hw_rule_rate, hw,
2005 SNDRV_PCM_HW_PARAM_RATE, -1);
2006 if (err < 0)
2007 return err;
2008 }
2009
2010 /* FIXME: this belong to lowlevel */
2011 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_TICK_TIME,
2012 1000000 / HZ, 1000000 / HZ);
2013 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2014
2015 return 0;
2016 }
2017
2018 static void pcm_release_private(struct snd_pcm_substream *substream)
2019 {
2020 snd_pcm_unlink(substream);
2021 }
2022
2023 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2024 {
2025 substream->ref_count--;
2026 if (substream->ref_count > 0)
2027 return;
2028
2029 snd_pcm_drop(substream);
2030 if (substream->hw_opened) {
2031 if (substream->ops->hw_free != NULL)
2032 substream->ops->hw_free(substream);
2033 substream->ops->close(substream);
2034 substream->hw_opened = 0;
2035 }
2036 if (substream->pcm_release) {
2037 substream->pcm_release(substream);
2038 substream->pcm_release = NULL;
2039 }
2040 snd_pcm_detach_substream(substream);
2041 }
2042
2043 EXPORT_SYMBOL(snd_pcm_release_substream);
2044
2045 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2046 struct file *file,
2047 struct snd_pcm_substream **rsubstream)
2048 {
2049 struct snd_pcm_substream *substream;
2050 int err;
2051
2052 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2053 if (err < 0)
2054 return err;
2055 if (substream->ref_count > 1) {
2056 *rsubstream = substream;
2057 return 0;
2058 }
2059
2060 err = snd_pcm_hw_constraints_init(substream);
2061 if (err < 0) {
2062 snd_printd("snd_pcm_hw_constraints_init failed\n");
2063 goto error;
2064 }
2065
2066 if ((err = substream->ops->open(substream)) < 0)
2067 goto error;
2068
2069 substream->hw_opened = 1;
2070
2071 err = snd_pcm_hw_constraints_complete(substream);
2072 if (err < 0) {
2073 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2074 goto error;
2075 }
2076
2077 *rsubstream = substream;
2078 return 0;
2079
2080 error:
2081 snd_pcm_release_substream(substream);
2082 return err;
2083 }
2084
2085 EXPORT_SYMBOL(snd_pcm_open_substream);
2086
2087 static int snd_pcm_open_file(struct file *file,
2088 struct snd_pcm *pcm,
2089 int stream,
2090 struct snd_pcm_file **rpcm_file)
2091 {
2092 struct snd_pcm_file *pcm_file;
2093 struct snd_pcm_substream *substream;
2094 struct snd_pcm_str *str;
2095 int err;
2096
2097 snd_assert(rpcm_file != NULL, return -EINVAL);
2098 *rpcm_file = NULL;
2099
2100 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2101 if (err < 0)
2102 return err;
2103
2104 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2105 if (pcm_file == NULL) {
2106 snd_pcm_release_substream(substream);
2107 return -ENOMEM;
2108 }
2109 pcm_file->substream = substream;
2110 if (substream->ref_count == 1) {
2111 str = substream->pstr;
2112 substream->file = pcm_file;
2113 substream->pcm_release = pcm_release_private;
2114 }
2115 file->private_data = pcm_file;
2116 *rpcm_file = pcm_file;
2117 return 0;
2118 }
2119
2120 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2121 {
2122 struct snd_pcm *pcm;
2123
2124 pcm = snd_lookup_minor_data(iminor(inode),
2125 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2126 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2127 }
2128
2129 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2130 {
2131 struct snd_pcm *pcm;
2132
2133 pcm = snd_lookup_minor_data(iminor(inode),
2134 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2135 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2136 }
2137
2138 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2139 {
2140 int err;
2141 struct snd_pcm_file *pcm_file;
2142 wait_queue_t wait;
2143
2144 if (pcm == NULL) {
2145 err = -ENODEV;
2146 goto __error1;
2147 }
2148 err = snd_card_file_add(pcm->card, file);
2149 if (err < 0)
2150 goto __error1;
2151 if (!try_module_get(pcm->card->module)) {
2152 err = -EFAULT;
2153 goto __error2;
2154 }
2155 init_waitqueue_entry(&wait, current);
2156 add_wait_queue(&pcm->open_wait, &wait);
2157 mutex_lock(&pcm->open_mutex);
2158 while (1) {
2159 err = snd_pcm_open_file(file, pcm, stream, &pcm_file);
2160 if (err >= 0)
2161 break;
2162 if (err == -EAGAIN) {
2163 if (file->f_flags & O_NONBLOCK) {
2164 err = -EBUSY;
2165 break;
2166 }
2167 } else
2168 break;
2169 set_current_state(TASK_INTERRUPTIBLE);
2170 mutex_unlock(&pcm->open_mutex);
2171 schedule();
2172 mutex_lock(&pcm->open_mutex);
2173 if (signal_pending(current)) {
2174 err = -ERESTARTSYS;
2175 break;
2176 }
2177 }
2178 remove_wait_queue(&pcm->open_wait, &wait);
2179 mutex_unlock(&pcm->open_mutex);
2180 if (err < 0)
2181 goto __error;
2182 return err;
2183
2184 __error:
2185 module_put(pcm->card->module);
2186 __error2:
2187 snd_card_file_remove(pcm->card, file);
2188 __error1:
2189 return err;
2190 }
2191
2192 static int snd_pcm_release(struct inode *inode, struct file *file)
2193 {
2194 struct snd_pcm *pcm;
2195 struct snd_pcm_substream *substream;
2196 struct snd_pcm_file *pcm_file;
2197
2198 pcm_file = file->private_data;
2199 substream = pcm_file->substream;
2200 snd_assert(substream != NULL, return -ENXIO);
2201 pcm = substream->pcm;
2202 fasync_helper(-1, file, 0, &substream->runtime->fasync);
2203 mutex_lock(&pcm->open_mutex);
2204 snd_pcm_release_substream(substream);
2205 kfree(pcm_file);
2206 mutex_unlock(&pcm->open_mutex);
2207 wake_up(&pcm->open_wait);
2208 module_put(pcm->card->module);
2209 snd_card_file_remove(pcm->card, file);
2210 return 0;
2211 }
2212
2213 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2214 snd_pcm_uframes_t frames)
2215 {
2216 struct snd_pcm_runtime *runtime = substream->runtime;
2217 snd_pcm_sframes_t appl_ptr;
2218 snd_pcm_sframes_t ret;
2219 snd_pcm_sframes_t hw_avail;
2220
2221 if (frames == 0)
2222 return 0;
2223
2224 snd_pcm_stream_lock_irq(substream);
2225 switch (runtime->status->state) {
2226 case SNDRV_PCM_STATE_PREPARED:
2227 break;
2228 case SNDRV_PCM_STATE_DRAINING:
2229 case SNDRV_PCM_STATE_RUNNING:
2230 if (snd_pcm_update_hw_ptr(substream) >= 0)
2231 break;
2232 /* Fall through */
2233 case SNDRV_PCM_STATE_XRUN:
2234 ret = -EPIPE;
2235 goto __end;
2236 default:
2237 ret = -EBADFD;
2238 goto __end;
2239 }
2240
2241 hw_avail = snd_pcm_playback_hw_avail(runtime);
2242 if (hw_avail <= 0) {
2243 ret = 0;
2244 goto __end;
2245 }
2246 if (frames > (snd_pcm_uframes_t)hw_avail)
2247 frames = hw_avail;
2248 else
2249 frames -= frames % runtime->xfer_align;
2250 appl_ptr = runtime->control->appl_ptr - frames;
2251 if (appl_ptr < 0)
2252 appl_ptr += runtime->boundary;
2253 runtime->control->appl_ptr = appl_ptr;
2254 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING &&
2255 runtime->sleep_min)
2256 snd_pcm_tick_prepare(substream);
2257 ret = frames;
2258 __end:
2259 snd_pcm_stream_unlock_irq(substream);
2260 return ret;
2261 }
2262
2263 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2264 snd_pcm_uframes_t frames)
2265 {
2266 struct snd_pcm_runtime *runtime = substream->runtime;
2267 snd_pcm_sframes_t appl_ptr;
2268 snd_pcm_sframes_t ret;
2269 snd_pcm_sframes_t hw_avail;
2270
2271 if (frames == 0)
2272 return 0;
2273
2274 snd_pcm_stream_lock_irq(substream);
2275 switch (runtime->status->state) {
2276 case SNDRV_PCM_STATE_PREPARED:
2277 case SNDRV_PCM_STATE_DRAINING:
2278 break;
2279 case SNDRV_PCM_STATE_RUNNING:
2280 if (snd_pcm_update_hw_ptr(substream) >= 0)
2281 break;
2282 /* Fall through */
2283 case SNDRV_PCM_STATE_XRUN:
2284 ret = -EPIPE;
2285 goto __end;
2286 default:
2287 ret = -EBADFD;
2288 goto __end;
2289 }
2290
2291 hw_avail = snd_pcm_capture_hw_avail(runtime);
2292 if (hw_avail <= 0) {
2293 ret = 0;
2294 goto __end;
2295 }
2296 if (frames > (snd_pcm_uframes_t)hw_avail)
2297 frames = hw_avail;
2298 else
2299 frames -= frames % runtime->xfer_align;
2300 appl_ptr = runtime->control->appl_ptr - frames;
2301 if (appl_ptr < 0)
2302 appl_ptr += runtime->boundary;
2303 runtime->control->appl_ptr = appl_ptr;
2304 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING &&
2305 runtime->sleep_min)
2306 snd_pcm_tick_prepare(substream);
2307 ret = frames;
2308 __end:
2309 snd_pcm_stream_unlock_irq(substream);
2310 return ret;
2311 }
2312
2313 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2314 snd_pcm_uframes_t frames)
2315 {
2316 struct snd_pcm_runtime *runtime = substream->runtime;
2317 snd_pcm_sframes_t appl_ptr;
2318 snd_pcm_sframes_t ret;
2319 snd_pcm_sframes_t avail;
2320
2321 if (frames == 0)
2322 return 0;
2323
2324 snd_pcm_stream_lock_irq(substream);
2325 switch (runtime->status->state) {
2326 case SNDRV_PCM_STATE_PREPARED:
2327 case SNDRV_PCM_STATE_PAUSED:
2328 break;
2329 case SNDRV_PCM_STATE_DRAINING:
2330 case SNDRV_PCM_STATE_RUNNING:
2331 if (snd_pcm_update_hw_ptr(substream) >= 0)
2332 break;
2333 /* Fall through */
2334 case SNDRV_PCM_STATE_XRUN:
2335 ret = -EPIPE;
2336 goto __end;
2337 default:
2338 ret = -EBADFD;
2339 goto __end;
2340 }
2341
2342 avail = snd_pcm_playback_avail(runtime);
2343 if (avail <= 0) {
2344 ret = 0;
2345 goto __end;
2346 }
2347 if (frames > (snd_pcm_uframes_t)avail)
2348 frames = avail;
2349 else
2350 frames -= frames % runtime->xfer_align;
2351 appl_ptr = runtime->control->appl_ptr + frames;
2352 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2353 appl_ptr -= runtime->boundary;
2354 runtime->control->appl_ptr = appl_ptr;
2355 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING &&
2356 runtime->sleep_min)
2357 snd_pcm_tick_prepare(substream);
2358 ret = frames;
2359 __end:
2360 snd_pcm_stream_unlock_irq(substream);
2361 return ret;
2362 }
2363
2364 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2365 snd_pcm_uframes_t frames)
2366 {
2367 struct snd_pcm_runtime *runtime = substream->runtime;
2368 snd_pcm_sframes_t appl_ptr;
2369 snd_pcm_sframes_t ret;
2370 snd_pcm_sframes_t avail;
2371
2372 if (frames == 0)
2373 return 0;
2374
2375 snd_pcm_stream_lock_irq(substream);
2376 switch (runtime->status->state) {
2377 case SNDRV_PCM_STATE_PREPARED:
2378 case SNDRV_PCM_STATE_DRAINING:
2379 case SNDRV_PCM_STATE_PAUSED:
2380 break;
2381 case SNDRV_PCM_STATE_RUNNING:
2382 if (snd_pcm_update_hw_ptr(substream) >= 0)
2383 break;
2384 /* Fall through */
2385 case SNDRV_PCM_STATE_XRUN:
2386 ret = -EPIPE;
2387 goto __end;
2388 default:
2389 ret = -EBADFD;
2390 goto __end;
2391 }
2392
2393 avail = snd_pcm_capture_avail(runtime);
2394 if (avail <= 0) {
2395 ret = 0;
2396 goto __end;
2397 }
2398 if (frames > (snd_pcm_uframes_t)avail)
2399 frames = avail;
2400 else
2401 frames -= frames % runtime->xfer_align;
2402 appl_ptr = runtime->control->appl_ptr + frames;
2403 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2404 appl_ptr -= runtime->boundary;
2405 runtime->control->appl_ptr = appl_ptr;
2406 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING &&
2407 runtime->sleep_min)
2408 snd_pcm_tick_prepare(substream);
2409 ret = frames;
2410 __end:
2411 snd_pcm_stream_unlock_irq(substream);
2412 return ret;
2413 }
2414
2415 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2416 {
2417 struct snd_pcm_runtime *runtime = substream->runtime;
2418 int err;
2419
2420 snd_pcm_stream_lock_irq(substream);
2421 switch (runtime->status->state) {
2422 case SNDRV_PCM_STATE_DRAINING:
2423 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2424 goto __badfd;
2425 case SNDRV_PCM_STATE_RUNNING:
2426 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2427 break;
2428 /* Fall through */
2429 case SNDRV_PCM_STATE_PREPARED:
2430 case SNDRV_PCM_STATE_SUSPENDED:
2431 err = 0;
2432 break;
2433 case SNDRV_PCM_STATE_XRUN:
2434 err = -EPIPE;
2435 break;
2436 default:
2437 __badfd:
2438 err = -EBADFD;
2439 break;
2440 }
2441 snd_pcm_stream_unlock_irq(substream);
2442 return err;
2443 }
2444
2445 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2446 snd_pcm_sframes_t __user *res)
2447 {
2448 struct snd_pcm_runtime *runtime = substream->runtime;
2449 int err;
2450 snd_pcm_sframes_t n = 0;
2451
2452 snd_pcm_stream_lock_irq(substream);
2453 switch (runtime->status->state) {
2454 case SNDRV_PCM_STATE_DRAINING:
2455 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2456 goto __badfd;
2457 case SNDRV_PCM_STATE_RUNNING:
2458 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2459 break;
2460 /* Fall through */
2461 case SNDRV_PCM_STATE_PREPARED:
2462 case SNDRV_PCM_STATE_SUSPENDED:
2463 err = 0;
2464 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2465 n = snd_pcm_playback_hw_avail(runtime);
2466 else
2467 n = snd_pcm_capture_avail(runtime);
2468 break;
2469 case SNDRV_PCM_STATE_XRUN:
2470 err = -EPIPE;
2471 break;
2472 default:
2473 __badfd:
2474 err = -EBADFD;
2475 break;
2476 }
2477 snd_pcm_stream_unlock_irq(substream);
2478 if (!err)
2479 if (put_user(n, res))
2480 err = -EFAULT;
2481 return err;
2482 }
2483
2484 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2485 struct snd_pcm_sync_ptr __user *_sync_ptr)
2486 {
2487 struct snd_pcm_runtime *runtime = substream->runtime;
2488 struct snd_pcm_sync_ptr sync_ptr;
2489 volatile struct snd_pcm_mmap_status *status;
2490 volatile struct snd_pcm_mmap_control *control;
2491 int err;
2492
2493 memset(&sync_ptr, 0, sizeof(sync_ptr));
2494 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2495 return -EFAULT;
2496 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2497 return -EFAULT;
2498 status = runtime->status;
2499 control = runtime->control;
2500 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2501 err = snd_pcm_hwsync(substream);
2502 if (err < 0)
2503 return err;
2504 }
2505 snd_pcm_stream_lock_irq(substream);
2506 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2507 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2508 else
2509 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2510 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2511 control->avail_min = sync_ptr.c.control.avail_min;
2512 else
2513 sync_ptr.c.control.avail_min = control->avail_min;
2514 sync_ptr.s.status.state = status->state;
2515 sync_ptr.s.status.hw_ptr = status->hw_ptr;
2516 sync_ptr.s.status.tstamp = status->tstamp;
2517 sync_ptr.s.status.suspended_state = status->suspended_state;
2518 snd_pcm_stream_unlock_irq(substream);
2519 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2520 return -EFAULT;
2521 return 0;
2522 }
2523
2524 static int snd_pcm_common_ioctl1(struct file *file,
2525 struct snd_pcm_substream *substream,
2526 unsigned int cmd, void __user *arg)
2527 {
2528 snd_assert(substream != NULL, return -ENXIO);
2529
2530 switch (cmd) {
2531 case SNDRV_PCM_IOCTL_PVERSION:
2532 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2533 case SNDRV_PCM_IOCTL_INFO:
2534 return snd_pcm_info_user(substream, arg);
2535 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2536 return 0;
2537 case SNDRV_PCM_IOCTL_HW_REFINE:
2538 return snd_pcm_hw_refine_user(substream, arg);
2539 case SNDRV_PCM_IOCTL_HW_PARAMS:
2540 return snd_pcm_hw_params_user(substream, arg);
2541 case SNDRV_PCM_IOCTL_HW_FREE:
2542 return snd_pcm_hw_free(substream);
2543 case SNDRV_PCM_IOCTL_SW_PARAMS:
2544 return snd_pcm_sw_params_user(substream, arg);
2545 case SNDRV_PCM_IOCTL_STATUS:
2546 return snd_pcm_status_user(substream, arg);
2547 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2548 return snd_pcm_channel_info_user(substream, arg);
2549 case SNDRV_PCM_IOCTL_PREPARE:
2550 return snd_pcm_prepare(substream, file);
2551 case SNDRV_PCM_IOCTL_RESET:
2552 return snd_pcm_reset(substream);
2553 case SNDRV_PCM_IOCTL_START:
2554 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2555 case SNDRV_PCM_IOCTL_LINK:
2556 return snd_pcm_link(substream, (int)(unsigned long) arg);
2557 case SNDRV_PCM_IOCTL_UNLINK:
2558 return snd_pcm_unlink(substream);
2559 case SNDRV_PCM_IOCTL_RESUME:
2560 return snd_pcm_resume(substream);
2561 case SNDRV_PCM_IOCTL_XRUN:
2562 return snd_pcm_xrun(substream);
2563 case SNDRV_PCM_IOCTL_HWSYNC:
2564 return snd_pcm_hwsync(substream);
2565 case SNDRV_PCM_IOCTL_DELAY:
2566 return snd_pcm_delay(substream, arg);
2567 case SNDRV_PCM_IOCTL_SYNC_PTR:
2568 return snd_pcm_sync_ptr(substream, arg);
2569 #ifdef CONFIG_SND_SUPPORT_OLD_API
2570 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2571 return snd_pcm_hw_refine_old_user(substream, arg);
2572 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2573 return snd_pcm_hw_params_old_user(substream, arg);
2574 #endif
2575 case SNDRV_PCM_IOCTL_DRAIN:
2576 return snd_pcm_drain(substream);
2577 case SNDRV_PCM_IOCTL_DROP:
2578 return snd_pcm_drop(substream);
2579 case SNDRV_PCM_IOCTL_PAUSE:
2580 {
2581 int res;
2582 snd_pcm_stream_lock_irq(substream);
2583 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2584 snd_pcm_stream_unlock_irq(substream);
2585 return res;
2586 }
2587 }
2588 snd_printd("unknown ioctl = 0x%x\n", cmd);
2589 return -ENOTTY;
2590 }
2591
2592 static int snd_pcm_playback_ioctl1(struct file *file,
2593 struct snd_pcm_substream *substream,
2594 unsigned int cmd, void __user *arg)
2595 {
2596 snd_assert(substream != NULL, return -ENXIO);
2597 snd_assert(substream->stream == SNDRV_PCM_STREAM_PLAYBACK, return -EINVAL);
2598 switch (cmd) {
2599 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2600 {
2601 struct snd_xferi xferi;
2602 struct snd_xferi __user *_xferi = arg;
2603 struct snd_pcm_runtime *runtime = substream->runtime;
2604 snd_pcm_sframes_t result;
2605 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2606 return -EBADFD;
2607 if (put_user(0, &_xferi->result))
2608 return -EFAULT;
2609 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2610 return -EFAULT;
2611 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2612 __put_user(result, &_xferi->result);
2613 return result < 0 ? result : 0;
2614 }
2615 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2616 {
2617 struct snd_xfern xfern;
2618 struct snd_xfern __user *_xfern = arg;
2619 struct snd_pcm_runtime *runtime = substream->runtime;
2620 void __user **bufs;
2621 snd_pcm_sframes_t result;
2622 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2623 return -EBADFD;
2624 if (runtime->channels > 128)
2625 return -EINVAL;
2626 if (put_user(0, &_xfern->result))
2627 return -EFAULT;
2628 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2629 return -EFAULT;
2630 bufs = kmalloc(sizeof(void *) * runtime->channels, GFP_KERNEL);
2631 if (bufs == NULL)
2632 return -ENOMEM;
2633 if (copy_from_user(bufs, xfern.bufs, sizeof(void *) * runtime->channels)) {
2634 kfree(bufs);
2635 return -EFAULT;
2636 }
2637 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2638 kfree(bufs);
2639 __put_user(result, &_xfern->result);
2640 return result < 0 ? result : 0;
2641 }
2642 case SNDRV_PCM_IOCTL_REWIND:
2643 {
2644 snd_pcm_uframes_t frames;
2645 snd_pcm_uframes_t __user *_frames = arg;
2646 snd_pcm_sframes_t result;
2647 if (get_user(frames, _frames))
2648 return -EFAULT;
2649 if (put_user(0, _frames))
2650 return -EFAULT;
2651 result = snd_pcm_playback_rewind(substream, frames);
2652 __put_user(result, _frames);
2653 return result < 0 ? result : 0;
2654 }
2655 case SNDRV_PCM_IOCTL_FORWARD:
2656 {
2657 snd_pcm_uframes_t frames;
2658 snd_pcm_uframes_t __user *_frames = arg;
2659 snd_pcm_sframes_t result;
2660 if (get_user(frames, _frames))
2661 return -EFAULT;
2662 if (put_user(0, _frames))
2663 return -EFAULT;
2664 result = snd_pcm_playback_forward(substream, frames);
2665 __put_user(result, _frames);
2666 return result < 0 ? result : 0;
2667 }
2668 }
2669 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2670 }
2671
2672 static int snd_pcm_capture_ioctl1(struct file *file,
2673 struct snd_pcm_substream *substream,
2674 unsigned int cmd, void __user *arg)
2675 {
2676 snd_assert(substream != NULL, return -ENXIO);
2677 snd_assert(substream->stream == SNDRV_PCM_STREAM_CAPTURE, return -EINVAL);
2678 switch (cmd) {
2679 case SNDRV_PCM_IOCTL_READI_FRAMES:
2680 {
2681 struct snd_xferi xferi;
2682 struct snd_xferi __user *_xferi = arg;
2683 struct snd_pcm_runtime *runtime = substream->runtime;
2684 snd_pcm_sframes_t result;
2685 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2686 return -EBADFD;
2687 if (put_user(0, &_xferi->result))
2688 return -EFAULT;
2689 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2690 return -EFAULT;
2691 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2692 __put_user(result, &_xferi->result);
2693 return result < 0 ? result : 0;
2694 }
2695 case SNDRV_PCM_IOCTL_READN_FRAMES:
2696 {
2697 struct snd_xfern xfern;
2698 struct snd_xfern __user *_xfern = arg;
2699 struct snd_pcm_runtime *runtime = substream->runtime;
2700 void *bufs;
2701 snd_pcm_sframes_t result;
2702 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2703 return -EBADFD;
2704 if (runtime->channels > 128)
2705 return -EINVAL;
2706 if (put_user(0, &_xfern->result))
2707 return -EFAULT;
2708 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2709 return -EFAULT;
2710 bufs = kmalloc(sizeof(void *) * runtime->channels, GFP_KERNEL);
2711 if (bufs == NULL)
2712 return -ENOMEM;
2713 if (copy_from_user(bufs, xfern.bufs, sizeof(void *) * runtime->channels)) {
2714 kfree(bufs);
2715 return -EFAULT;
2716 }
2717 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2718 kfree(bufs);
2719 __put_user(result, &_xfern->result);
2720 return result < 0 ? result : 0;
2721 }
2722 case SNDRV_PCM_IOCTL_REWIND:
2723 {
2724 snd_pcm_uframes_t frames;
2725 snd_pcm_uframes_t __user *_frames = arg;
2726 snd_pcm_sframes_t result;
2727 if (get_user(frames, _frames))
2728 return -EFAULT;
2729 if (put_user(0, _frames))
2730 return -EFAULT;
2731 result = snd_pcm_capture_rewind(substream, frames);
2732 __put_user(result, _frames);
2733 return result < 0 ? result : 0;
2734 }
2735 case SNDRV_PCM_IOCTL_FORWARD:
2736 {
2737 snd_pcm_uframes_t frames;
2738 snd_pcm_uframes_t __user *_frames = arg;
2739 snd_pcm_sframes_t result;
2740 if (get_user(frames, _frames))
2741 return -EFAULT;
2742 if (put_user(0, _frames))
2743 return -EFAULT;
2744 result = snd_pcm_capture_forward(substream, frames);
2745 __put_user(result, _frames);
2746 return result < 0 ? result : 0;
2747 }
2748 }
2749 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2750 }
2751
2752 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2753 unsigned long arg)
2754 {
2755 struct snd_pcm_file *pcm_file;
2756
2757 pcm_file = file->private_data;
2758
2759 if (((cmd >> 8) & 0xff) != 'A')
2760 return -ENOTTY;
2761
2762 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2763 (void __user *)arg);
2764 }
2765
2766 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2767 unsigned long arg)
2768 {
2769 struct snd_pcm_file *pcm_file;
2770
2771 pcm_file = file->private_data;
2772
2773 if (((cmd >> 8) & 0xff) != 'A')
2774 return -ENOTTY;
2775
2776 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2777 (void __user *)arg);
2778 }
2779
2780 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2781 unsigned int cmd, void *arg)
2782 {
2783 mm_segment_t fs;
2784 int result;
2785
2786 fs = snd_enter_user();
2787 switch (substream->stream) {
2788 case SNDRV_PCM_STREAM_PLAYBACK:
2789 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2790 (void __user *)arg);
2791 break;
2792 case SNDRV_PCM_STREAM_CAPTURE:
2793 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2794 (void __user *)arg);
2795 break;
2796 default:
2797 result = -EINVAL;
2798 break;
2799 }
2800 snd_leave_user(fs);
2801 return result;
2802 }
2803
2804 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2805
2806 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2807 loff_t * offset)
2808 {
2809 struct snd_pcm_file *pcm_file;
2810 struct snd_pcm_substream *substream;
2811 struct snd_pcm_runtime *runtime;
2812 snd_pcm_sframes_t result;
2813
2814 pcm_file = file->private_data;
2815 substream = pcm_file->substream;
2816 snd_assert(substream != NULL, return -ENXIO);
2817 runtime = substream->runtime;
2818 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2819 return -EBADFD;
2820 if (!frame_aligned(runtime, count))
2821 return -EINVAL;
2822 count = bytes_to_frames(runtime, count);
2823 result = snd_pcm_lib_read(substream, buf, count);
2824 if (result > 0)
2825 result = frames_to_bytes(runtime, result);
2826 return result;
2827 }
2828
2829 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2830 size_t count, loff_t * offset)
2831 {
2832 struct snd_pcm_file *pcm_file;
2833 struct snd_pcm_substream *substream;
2834 struct snd_pcm_runtime *runtime;
2835 snd_pcm_sframes_t result;
2836
2837 pcm_file = file->private_data;
2838 substream = pcm_file->substream;
2839 snd_assert(substream != NULL, result = -ENXIO; goto end);
2840 runtime = substream->runtime;
2841 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
2842 result = -EBADFD;
2843 goto end;
2844 }
2845 if (!frame_aligned(runtime, count)) {
2846 result = -EINVAL;
2847 goto end;
2848 }
2849 count = bytes_to_frames(runtime, count);
2850 result = snd_pcm_lib_write(substream, buf, count);
2851 if (result > 0)
2852 result = frames_to_bytes(runtime, result);
2853 end:
2854 return result;
2855 }
2856
2857 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2858 unsigned long nr_segs, loff_t pos)
2859
2860 {
2861 struct snd_pcm_file *pcm_file;
2862 struct snd_pcm_substream *substream;
2863 struct snd_pcm_runtime *runtime;
2864 snd_pcm_sframes_t result;
2865 unsigned long i;
2866 void __user **bufs;
2867 snd_pcm_uframes_t frames;
2868
2869 pcm_file = iocb->ki_filp->private_data;
2870 substream = pcm_file->substream;
2871 snd_assert(substream != NULL, return -ENXIO);
2872 runtime = substream->runtime;
2873 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2874 return -EBADFD;
2875 if (nr_segs > 1024 || nr_segs != runtime->channels)
2876 return -EINVAL;
2877 if (!frame_aligned(runtime, iov->iov_len))
2878 return -EINVAL;
2879 frames = bytes_to_samples(runtime, iov->iov_len);
2880 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2881 if (bufs == NULL)
2882 return -ENOMEM;
2883 for (i = 0; i < nr_segs; ++i)
2884 bufs[i] = iov[i].iov_base;
2885 result = snd_pcm_lib_readv(substream, bufs, frames);
2886 if (result > 0)
2887 result = frames_to_bytes(runtime, result);
2888 kfree(bufs);
2889 return result;
2890 }
2891
2892 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2893 unsigned long nr_segs, loff_t pos)
2894 {
2895 struct snd_pcm_file *pcm_file;
2896 struct snd_pcm_substream *substream;
2897 struct snd_pcm_runtime *runtime;
2898 snd_pcm_sframes_t result;
2899 unsigned long i;
2900 void __user **bufs;
2901 snd_pcm_uframes_t frames;
2902
2903 pcm_file = iocb->ki_filp->private_data;
2904 substream = pcm_file->substream;
2905 snd_assert(substream != NULL, result = -ENXIO; goto end);
2906 runtime = substream->runtime;
2907 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
2908 result = -EBADFD;
2909 goto end;
2910 }
2911 if (nr_segs > 128 || nr_segs != runtime->channels ||
2912 !frame_aligned(runtime, iov->iov_len)) {
2913 result = -EINVAL;
2914 goto end;
2915 }
2916 frames = bytes_to_samples(runtime, iov->iov_len);
2917 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2918 if (bufs == NULL)
2919 return -ENOMEM;
2920 for (i = 0; i < nr_segs; ++i)
2921 bufs[i] = iov[i].iov_base;
2922 result = snd_pcm_lib_writev(substream, bufs, frames);
2923 if (result > 0)
2924 result = frames_to_bytes(runtime, result);
2925 kfree(bufs);
2926 end:
2927 return result;
2928 }
2929
2930 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2931 {
2932 struct snd_pcm_file *pcm_file;
2933 struct snd_pcm_substream *substream;
2934 struct snd_pcm_runtime *runtime;
2935 unsigned int mask;
2936 snd_pcm_uframes_t avail;
2937
2938 pcm_file = file->private_data;
2939
2940 substream = pcm_file->substream;
2941 snd_assert(substream != NULL, return -ENXIO);
2942 runtime = substream->runtime;
2943
2944 poll_wait(file, &runtime->sleep, wait);
2945
2946 snd_pcm_stream_lock_irq(substream);
2947 avail = snd_pcm_playback_avail(runtime);
2948 switch (runtime->status->state) {
2949 case SNDRV_PCM_STATE_RUNNING:
2950 case SNDRV_PCM_STATE_PREPARED:
2951 case SNDRV_PCM_STATE_PAUSED:
2952 if (avail >= runtime->control->avail_min) {
2953 mask = POLLOUT | POLLWRNORM;
2954 break;
2955 }
2956 /* Fall through */
2957 case SNDRV_PCM_STATE_DRAINING:
2958 mask = 0;
2959 break;
2960 default:
2961 mask = POLLOUT | POLLWRNORM | POLLERR;
2962 break;
2963 }
2964 snd_pcm_stream_unlock_irq(substream);
2965 return mask;
2966 }
2967
2968 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2969 {
2970 struct snd_pcm_file *pcm_file;
2971 struct snd_pcm_substream *substream;
2972 struct snd_pcm_runtime *runtime;
2973 unsigned int mask;
2974 snd_pcm_uframes_t avail;
2975
2976 pcm_file = file->private_data;
2977
2978 substream = pcm_file->substream;
2979 snd_assert(substream != NULL, return -ENXIO);
2980 runtime = substream->runtime;
2981
2982 poll_wait(file, &runtime->sleep, wait);
2983
2984 snd_pcm_stream_lock_irq(substream);
2985 avail = snd_pcm_capture_avail(runtime);
2986 switch (runtime->status->state) {
2987 case SNDRV_PCM_STATE_RUNNING:
2988 case SNDRV_PCM_STATE_PREPARED:
2989 case SNDRV_PCM_STATE_PAUSED:
2990 if (avail >= runtime->control->avail_min) {
2991 mask = POLLIN | POLLRDNORM;
2992 break;
2993 }
2994 mask = 0;
2995 break;
2996 case SNDRV_PCM_STATE_DRAINING:
2997 if (avail > 0) {
2998 mask = POLLIN | POLLRDNORM;
2999 break;
3000 }
3001 /* Fall through */
3002 default:
3003 mask = POLLIN | POLLRDNORM | POLLERR;
3004 break;
3005 }
3006 snd_pcm_stream_unlock_irq(substream);
3007 return mask;
3008 }
3009
3010 /*
3011 * mmap support
3012 */
3013
3014 /*
3015 * Only on coherent architectures, we can mmap the status and the control records
3016 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
3017 */
3018 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3019 /*
3020 * mmap status record
3021 */
3022 static struct page * snd_pcm_mmap_status_nopage(struct vm_area_struct *area,
3023 unsigned long address, int *type)
3024 {
3025 struct snd_pcm_substream *substream = area->vm_private_data;
3026 struct snd_pcm_runtime *runtime;
3027 struct page * page;
3028
3029 if (substream == NULL)
3030 return NOPAGE_SIGBUS;
3031 runtime = substream->runtime;
3032 page = virt_to_page(runtime->status);
3033 get_page(page);
3034 if (type)
3035 *type = VM_FAULT_MINOR;
3036 return page;
3037 }
3038
3039 static struct vm_operations_struct snd_pcm_vm_ops_status =
3040 {
3041 .nopage = snd_pcm_mmap_status_nopage,
3042 };
3043
3044 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3045 struct vm_area_struct *area)
3046 {
3047 struct snd_pcm_runtime *runtime;
3048 long size;
3049 if (!(area->vm_flags & VM_READ))
3050 return -EINVAL;
3051 runtime = substream->runtime;
3052 snd_assert(runtime != NULL, return -EAGAIN);
3053 size = area->vm_end - area->vm_start;
3054 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3055 return -EINVAL;
3056 area->vm_ops = &snd_pcm_vm_ops_status;
3057 area->vm_private_data = substream;
3058 area->vm_flags |= VM_RESERVED;
3059 return 0;
3060 }
3061
3062 /*
3063 * mmap control record
3064 */
3065 static struct page * snd_pcm_mmap_control_nopage(struct vm_area_struct *area,
3066 unsigned long address, int *type)
3067 {
3068 struct snd_pcm_substream *substream = area->vm_private_data;
3069 struct snd_pcm_runtime *runtime;
3070 struct page * page;
3071
3072 if (substream == NULL)
3073 return NOPAGE_SIGBUS;
3074 runtime = substream->runtime;
3075 page = virt_to_page(runtime->control);
3076 get_page(page);
3077 if (type)
3078 *type = VM_FAULT_MINOR;
3079 return page;
3080 }
3081
3082 static struct vm_operations_struct snd_pcm_vm_ops_control =
3083 {
3084 .nopage = snd_pcm_mmap_control_nopage,
3085 };
3086
3087 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3088 struct vm_area_struct *area)
3089 {
3090 struct snd_pcm_runtime *runtime;
3091 long size;
3092 if (!(area->vm_flags & VM_READ))
3093 return -EINVAL;
3094 runtime = substream->runtime;
3095 snd_assert(runtime != NULL, return -EAGAIN);
3096 size = area->vm_end - area->vm_start;
3097 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3098 return -EINVAL;
3099 area->vm_ops = &snd_pcm_vm_ops_control;
3100 area->vm_private_data = substream;
3101 area->vm_flags |= VM_RESERVED;
3102 return 0;
3103 }
3104 #else /* ! coherent mmap */
3105 /*
3106 * don't support mmap for status and control records.
3107 */
3108 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3109 struct vm_area_struct *area)
3110 {
3111 return -ENXIO;
3112 }
3113 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3114 struct vm_area_struct *area)
3115 {
3116 return -ENXIO;
3117 }
3118 #endif /* coherent mmap */
3119
3120 /*
3121 * nopage callback for mmapping a RAM page
3122 */
3123 static struct page *snd_pcm_mmap_data_nopage(struct vm_area_struct *area,
3124 unsigned long address, int *type)
3125 {
3126 struct snd_pcm_substream *substream = area->vm_private_data;
3127 struct snd_pcm_runtime *runtime;
3128 unsigned long offset;
3129 struct page * page;
3130 void *vaddr;
3131 size_t dma_bytes;
3132
3133 if (substream == NULL)
3134 return NOPAGE_SIGBUS;
3135 runtime = substream->runtime;
3136 offset = area->vm_pgoff << PAGE_SHIFT;
3137 offset += address - area->vm_start;
3138 snd_assert((offset % PAGE_SIZE) == 0, return NOPAGE_SIGBUS);
3139 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3140 if (offset > dma_bytes - PAGE_SIZE)
3141 return NOPAGE_SIGBUS;
3142 if (substream->ops->page) {
3143 page = substream->ops->page(substream, offset);
3144 if (! page)
3145 return NOPAGE_OOM; /* XXX: is this really due to OOM? */
3146 } else {
3147 vaddr = runtime->dma_area + offset;
3148 page = virt_to_page(vaddr);
3149 }
3150 get_page(page);
3151 if (type)
3152 *type = VM_FAULT_MINOR;
3153 return page;
3154 }
3155
3156 static struct vm_operations_struct snd_pcm_vm_ops_data =
3157 {
3158 .open = snd_pcm_mmap_data_open,
3159 .close = snd_pcm_mmap_data_close,
3160 .nopage = snd_pcm_mmap_data_nopage,
3161 };
3162
3163 /*
3164 * mmap the DMA buffer on RAM
3165 */
3166 static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
3167 struct vm_area_struct *area)
3168 {
3169 area->vm_ops = &snd_pcm_vm_ops_data;
3170 area->vm_private_data = substream;
3171 area->vm_flags |= VM_RESERVED;
3172 atomic_inc(&substream->mmap_count);
3173 return 0;
3174 }
3175
3176 /*
3177 * mmap the DMA buffer on I/O memory area
3178 */
3179 #if SNDRV_PCM_INFO_MMAP_IOMEM
3180 static struct vm_operations_struct snd_pcm_vm_ops_data_mmio =
3181 {
3182 .open = snd_pcm_mmap_data_open,
3183 .close = snd_pcm_mmap_data_close,
3184 };
3185
3186 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3187 struct vm_area_struct *area)
3188 {
3189 long size;
3190 unsigned long offset;
3191
3192 #ifdef pgprot_noncached
3193 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3194 #endif
3195 area->vm_ops = &snd_pcm_vm_ops_data_mmio;
3196 area->vm_private_data = substream;
3197 area->vm_flags |= VM_IO;
3198 size = area->vm_end - area->vm_start;
3199 offset = area->vm_pgoff << PAGE_SHIFT;
3200 if (io_remap_pfn_range(area, area->vm_start,
3201 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
3202 size, area->vm_page_prot))
3203 return -EAGAIN;
3204 atomic_inc(&substream->mmap_count);
3205 return 0;
3206 }
3207
3208 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3209 #endif /* SNDRV_PCM_INFO_MMAP */
3210
3211 /*
3212 * mmap DMA buffer
3213 */
3214 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3215 struct vm_area_struct *area)
3216 {
3217 struct snd_pcm_runtime *runtime;
3218 long size;
3219 unsigned long offset;
3220 size_t dma_bytes;
3221
3222 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3223 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3224 return -EINVAL;
3225 } else {
3226 if (!(area->vm_flags & VM_READ))
3227 return -EINVAL;
3228 }
3229 runtime = substream->runtime;
3230 snd_assert(runtime != NULL, return -EAGAIN);
3231 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3232 return -EBADFD;
3233 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3234 return -ENXIO;
3235 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3236 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3237 return -EINVAL;
3238 size = area->vm_end - area->vm_start;
3239 offset = area->vm_pgoff << PAGE_SHIFT;
3240 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3241 if ((size_t)size > dma_bytes)
3242 return -EINVAL;
3243 if (offset > dma_bytes - size)
3244 return -EINVAL;
3245
3246 if (substream->ops->mmap)
3247 return substream->ops->mmap(substream, area);
3248 else
3249 return snd_pcm_default_mmap(substream, area);
3250 }
3251
3252 EXPORT_SYMBOL(snd_pcm_mmap_data);
3253
3254 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3255 {
3256 struct snd_pcm_file * pcm_file;
3257 struct snd_pcm_substream *substream;
3258 unsigned long offset;
3259
3260 pcm_file = file->private_data;
3261 substream = pcm_file->substream;
3262 snd_assert(substream != NULL, return -ENXIO);
3263
3264 offset = area->vm_pgoff << PAGE_SHIFT;
3265 switch (offset) {
3266 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3267 if (pcm_file->no_compat_mmap)
3268 return -ENXIO;
3269 return snd_pcm_mmap_status(substream, file, area);
3270 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3271 if (pcm_file->no_compat_mmap)
3272 return -ENXIO;
3273 return snd_pcm_mmap_control(substream, file, area);
3274 default:
3275 return snd_pcm_mmap_data(substream, file, area);
3276 }
3277 return 0;
3278 }
3279
3280 static int snd_pcm_fasync(int fd, struct file * file, int on)
3281 {
3282 struct snd_pcm_file * pcm_file;
3283 struct snd_pcm_substream *substream;
3284 struct snd_pcm_runtime *runtime;
3285 int err;
3286
3287 pcm_file = file->private_data;
3288 substream = pcm_file->substream;
3289 snd_assert(substream != NULL, return -ENXIO);
3290 runtime = substream->runtime;
3291
3292 err = fasync_helper(fd, file, on, &runtime->fasync);
3293 if (err < 0)
3294 return err;
3295 return 0;
3296 }
3297
3298 /*
3299 * ioctl32 compat
3300 */
3301 #ifdef CONFIG_COMPAT
3302 #include "pcm_compat.c"
3303 #else
3304 #define snd_pcm_ioctl_compat NULL
3305 #endif
3306
3307 /*
3308 * To be removed helpers to keep binary compatibility
3309 */
3310
3311 #ifdef CONFIG_SND_SUPPORT_OLD_API
3312 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3313 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3314
3315 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3316 struct snd_pcm_hw_params_old *oparams)
3317 {
3318 unsigned int i;
3319
3320 memset(params, 0, sizeof(*params));
3321 params->flags = oparams->flags;
3322 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3323 params->masks[i].bits[0] = oparams->masks[i];
3324 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3325 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3326 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3327 params->info = oparams->info;
3328 params->msbits = oparams->msbits;
3329 params->rate_num = oparams->rate_num;
3330 params->rate_den = oparams->rate_den;
3331 params->fifo_size = oparams->fifo_size;
3332 }
3333
3334 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3335 struct snd_pcm_hw_params *params)
3336 {
3337 unsigned int i;
3338
3339 memset(oparams, 0, sizeof(*oparams));
3340 oparams->flags = params->flags;
3341 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3342 oparams->masks[i] = params->masks[i].bits[0];
3343 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3344 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3345 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3346 oparams->info = params->info;
3347 oparams->msbits = params->msbits;
3348 oparams->rate_num = params->rate_num;
3349 oparams->rate_den = params->rate_den;
3350 oparams->fifo_size = params->fifo_size;
3351 }
3352
3353 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3354 struct snd_pcm_hw_params_old __user * _oparams)
3355 {
3356 struct snd_pcm_hw_params *params;
3357 struct snd_pcm_hw_params_old *oparams = NULL;
3358 int err;
3359
3360 params = kmalloc(sizeof(*params), GFP_KERNEL);
3361 if (!params) {
3362 err = -ENOMEM;
3363 goto out;
3364 }
3365 oparams = kmalloc(sizeof(*oparams), GFP_KERNEL);
3366 if (!oparams) {
3367 err = -ENOMEM;
3368 goto out;
3369 }
3370
3371 if (copy_from_user(oparams, _oparams, sizeof(*oparams))) {
3372 err = -EFAULT;
3373 goto out;
3374 }
3375 snd_pcm_hw_convert_from_old_params(params, oparams);
3376 err = snd_pcm_hw_refine(substream, params);
3377 snd_pcm_hw_convert_to_old_params(oparams, params);
3378 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3379 if (!err)
3380 err = -EFAULT;
3381 }
3382 out:
3383 kfree(params);
3384 kfree(oparams);
3385 return err;
3386 }
3387
3388 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3389 struct snd_pcm_hw_params_old __user * _oparams)
3390 {
3391 struct snd_pcm_hw_params *params;
3392 struct snd_pcm_hw_params_old *oparams = NULL;
3393 int err;
3394
3395 params = kmalloc(sizeof(*params), GFP_KERNEL);
3396 if (!params) {
3397 err = -ENOMEM;
3398 goto out;
3399 }
3400 oparams = kmalloc(sizeof(*oparams), GFP_KERNEL);
3401 if (!oparams) {
3402 err = -ENOMEM;
3403 goto out;
3404 }
3405 if (copy_from_user(oparams, _oparams, sizeof(*oparams))) {
3406 err = -EFAULT;
3407 goto out;
3408 }
3409 snd_pcm_hw_convert_from_old_params(params, oparams);
3410 err = snd_pcm_hw_params(substream, params);
3411 snd_pcm_hw_convert_to_old_params(oparams, params);
3412 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3413 if (!err)
3414 err = -EFAULT;
3415 }
3416 out:
3417 kfree(params);
3418 kfree(oparams);
3419 return err;
3420 }
3421 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3422
3423 /*
3424 * Register section
3425 */
3426
3427 const struct file_operations snd_pcm_f_ops[2] = {
3428 {
3429 .owner = THIS_MODULE,
3430 .write = snd_pcm_write,
3431 .aio_write = snd_pcm_aio_write,
3432 .open = snd_pcm_playback_open,
3433 .release = snd_pcm_release,
3434 .poll = snd_pcm_playback_poll,
3435 .unlocked_ioctl = snd_pcm_playback_ioctl,
3436 .compat_ioctl = snd_pcm_ioctl_compat,
3437 .mmap = snd_pcm_mmap,
3438 .fasync = snd_pcm_fasync,
3439 },
3440 {
3441 .owner = THIS_MODULE,
3442 .read = snd_pcm_read,
3443 .aio_read = snd_pcm_aio_read,
3444 .open = snd_pcm_capture_open,
3445 .release = snd_pcm_release,
3446 .poll = snd_pcm_capture_poll,
3447 .unlocked_ioctl = snd_pcm_capture_ioctl,
3448 .compat_ioctl = snd_pcm_ioctl_compat,
3449 .mmap = snd_pcm_mmap,
3450 .fasync = snd_pcm_fasync,
3451 }
3452 };
Linux kernel - Deliverables
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