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ALSA: Kill snd_assert() in sound/core/*
[linux-2.6/x86.git] / sound / core / pcm_native.c
blobdf2299a8cefd4d464966ee8b6fbc3988ad94a2cc
1 /*
2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.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 <linux/mm.h>
23 #include <linux/file.h>
24 #include <linux/slab.h>
25 #include <linux/smp_lock.h>
26 #include <linux/time.h>
27 #include <linux/pm_qos_params.h>
28 #include <linux/uio.h>
29 #include <sound/core.h>
30 #include <sound/control.h>
31 #include <sound/info.h>
32 #include <sound/pcm.h>
33 #include <sound/pcm_params.h>
34 #include <sound/timer.h>
35 #include <sound/minors.h>
36 #include <asm/io.h>
37
38 /*
39 * Compatibility
40 */
41
42 struct snd_pcm_hw_params_old {
43 unsigned int flags;
44 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
45 SNDRV_PCM_HW_PARAM_ACCESS + 1];
46 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
47 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
48 unsigned int rmask;
49 unsigned int cmask;
50 unsigned int info;
51 unsigned int msbits;
52 unsigned int rate_num;
53 unsigned int rate_den;
54 snd_pcm_uframes_t fifo_size;
55 unsigned char reserved[64];
56 };
57
58 #ifdef CONFIG_SND_SUPPORT_OLD_API
59 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
60 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
61
62 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
63 struct snd_pcm_hw_params_old __user * _oparams);
64 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
65 struct snd_pcm_hw_params_old __user * _oparams);
66 #endif
67 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
68
69 /*
70 *
71 */
72
73 DEFINE_RWLOCK(snd_pcm_link_rwlock);
74 EXPORT_SYMBOL(snd_pcm_link_rwlock);
75
76 static DECLARE_RWSEM(snd_pcm_link_rwsem);
77
78 static inline mm_segment_t snd_enter_user(void)
79 {
80 mm_segment_t fs = get_fs();
81 set_fs(get_ds());
82 return fs;
83 }
84
85 static inline void snd_leave_user(mm_segment_t fs)
86 {
87 set_fs(fs);
88 }
89
90
91
92 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
93 {
94 struct snd_pcm_runtime *runtime;
95 struct snd_pcm *pcm = substream->pcm;
96 struct snd_pcm_str *pstr = substream->pstr;
97
98 memset(info, 0, sizeof(*info));
99 info->card = pcm->card->number;
100 info->device = pcm->device;
101 info->stream = substream->stream;
102 info->subdevice = substream->number;
103 strlcpy(info->id, pcm->id, sizeof(info->id));
104 strlcpy(info->name, pcm->name, sizeof(info->name));
105 info->dev_class = pcm->dev_class;
106 info->dev_subclass = pcm->dev_subclass;
107 info->subdevices_count = pstr->substream_count;
108 info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
109 strlcpy(info->subname, substream->name, sizeof(info->subname));
110 runtime = substream->runtime;
111 /* AB: FIXME!!! This is definitely nonsense */
112 if (runtime) {
113 info->sync = runtime->sync;
114 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
115 }
116 return 0;
117 }
118
119 int snd_pcm_info_user(struct snd_pcm_substream *substream,
120 struct snd_pcm_info __user * _info)
121 {
122 struct snd_pcm_info *info;
123 int err;
124
125 info = kmalloc(sizeof(*info), GFP_KERNEL);
126 if (! info)
127 return -ENOMEM;
128 err = snd_pcm_info(substream, info);
129 if (err >= 0) {
130 if (copy_to_user(_info, info, sizeof(*info)))
131 err = -EFAULT;
132 }
133 kfree(info);
134 return err;
135 }
136
137 #undef RULES_DEBUG
138
139 #ifdef RULES_DEBUG
140 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
141 char *snd_pcm_hw_param_names[] = {
142 HW_PARAM(ACCESS),
143 HW_PARAM(FORMAT),
144 HW_PARAM(SUBFORMAT),
145 HW_PARAM(SAMPLE_BITS),
146 HW_PARAM(FRAME_BITS),
147 HW_PARAM(CHANNELS),
148 HW_PARAM(RATE),
149 HW_PARAM(PERIOD_TIME),
150 HW_PARAM(PERIOD_SIZE),
151 HW_PARAM(PERIOD_BYTES),
152 HW_PARAM(PERIODS),
153 HW_PARAM(BUFFER_TIME),
154 HW_PARAM(BUFFER_SIZE),
155 HW_PARAM(BUFFER_BYTES),
156 HW_PARAM(TICK_TIME),
157 };
158 #endif
159
160 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
161 struct snd_pcm_hw_params *params)
162 {
163 unsigned int k;
164 struct snd_pcm_hardware *hw;
165 struct snd_interval *i = NULL;
166 struct snd_mask *m = NULL;
167 struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
168 unsigned int rstamps[constrs->rules_num];
169 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
170 unsigned int stamp = 2;
171 int changed, again;
172
173 params->info = 0;
174 params->fifo_size = 0;
175 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
176 params->msbits = 0;
177 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
178 params->rate_num = 0;
179 params->rate_den = 0;
180 }
181
182 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
183 m = hw_param_mask(params, k);
184 if (snd_mask_empty(m))
185 return -EINVAL;
186 if (!(params->rmask & (1 << k)))
187 continue;
188 #ifdef RULES_DEBUG
189 printk("%s = ", snd_pcm_hw_param_names[k]);
190 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
191 #endif
192 changed = snd_mask_refine(m, constrs_mask(constrs, k));
193 #ifdef RULES_DEBUG
194 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
195 #endif
196 if (changed)
197 params->cmask |= 1 << k;
198 if (changed < 0)
199 return changed;
200 }
201
202 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
203 i = hw_param_interval(params, k);
204 if (snd_interval_empty(i))
205 return -EINVAL;
206 if (!(params->rmask & (1 << k)))
207 continue;
208 #ifdef RULES_DEBUG
209 printk("%s = ", snd_pcm_hw_param_names[k]);
210 if (i->empty)
211 printk("empty");
212 else
213 printk("%c%u %u%c",
214 i->openmin ? '(' : '[', i->min,
215 i->max, i->openmax ? ')' : ']');
216 printk(" -> ");
217 #endif
218 changed = snd_interval_refine(i, constrs_interval(constrs, k));
219 #ifdef RULES_DEBUG
220 if (i->empty)
221 printk("empty\n");
222 else
223 printk("%c%u %u%c\n",
224 i->openmin ? '(' : '[', i->min,
225 i->max, i->openmax ? ')' : ']');
226 #endif
227 if (changed)
228 params->cmask |= 1 << k;
229 if (changed < 0)
230 return changed;
231 }
232
233 for (k = 0; k < constrs->rules_num; k++)
234 rstamps[k] = 0;
235 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
236 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
237 do {
238 again = 0;
239 for (k = 0; k < constrs->rules_num; k++) {
240 struct snd_pcm_hw_rule *r = &constrs->rules[k];
241 unsigned int d;
242 int doit = 0;
243 if (r->cond && !(r->cond & params->flags))
244 continue;
245 for (d = 0; r->deps[d] >= 0; d++) {
246 if (vstamps[r->deps[d]] > rstamps[k]) {
247 doit = 1;
248 break;
249 }
250 }
251 if (!doit)
252 continue;
253 #ifdef RULES_DEBUG
254 printk("Rule %d [%p]: ", k, r->func);
255 if (r->var >= 0) {
256 printk("%s = ", snd_pcm_hw_param_names[r->var]);
257 if (hw_is_mask(r->var)) {
258 m = hw_param_mask(params, r->var);
259 printk("%x", *m->bits);
260 } else {
261 i = hw_param_interval(params, r->var);
262 if (i->empty)
263 printk("empty");
264 else
265 printk("%c%u %u%c",
266 i->openmin ? '(' : '[', i->min,
267 i->max, i->openmax ? ')' : ']');
268 }
269 }
270 #endif
271 changed = r->func(params, r);
272 #ifdef RULES_DEBUG
273 if (r->var >= 0) {
274 printk(" -> ");
275 if (hw_is_mask(r->var))
276 printk("%x", *m->bits);
277 else {
278 if (i->empty)
279 printk("empty");
280 else
281 printk("%c%u %u%c",
282 i->openmin ? '(' : '[', i->min,
283 i->max, i->openmax ? ')' : ']');
284 }
285 }
286 printk("\n");
287 #endif
288 rstamps[k] = stamp;
289 if (changed && r->var >= 0) {
290 params->cmask |= (1 << r->var);
291 vstamps[r->var] = stamp;
292 again = 1;
293 }
294 if (changed < 0)
295 return changed;
296 stamp++;
297 }
298 } while (again);
299 if (!params->msbits) {
300 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
301 if (snd_interval_single(i))
302 params->msbits = snd_interval_value(i);
303 }
304
305 if (!params->rate_den) {
306 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
307 if (snd_interval_single(i)) {
308 params->rate_num = snd_interval_value(i);
309 params->rate_den = 1;
310 }
311 }
312
313 hw = &substream->runtime->hw;
314 if (!params->info)
315 params->info = hw->info;
316 if (!params->fifo_size)
317 params->fifo_size = hw->fifo_size;
318 params->rmask = 0;
319 return 0;
320 }
321
322 EXPORT_SYMBOL(snd_pcm_hw_refine);
323
324 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
325 struct snd_pcm_hw_params __user * _params)
326 {
327 struct snd_pcm_hw_params *params;
328 int err;
329
330 params = kmalloc(sizeof(*params), GFP_KERNEL);
331 if (!params) {
332 err = -ENOMEM;
333 goto out;
334 }
335 if (copy_from_user(params, _params, sizeof(*params))) {
336 err = -EFAULT;
337 goto out;
338 }
339 err = snd_pcm_hw_refine(substream, params);
340 if (copy_to_user(_params, params, sizeof(*params))) {
341 if (!err)
342 err = -EFAULT;
343 }
344 out:
345 kfree(params);
346 return err;
347 }
348
349 static int period_to_usecs(struct snd_pcm_runtime *runtime)
350 {
351 int usecs;
352
353 if (! runtime->rate)
354 return -1; /* invalid */
355
356 /* take 75% of period time as the deadline */
357 usecs = (750000 / runtime->rate) * runtime->period_size;
358 usecs += ((750000 % runtime->rate) * runtime->period_size) /
359 runtime->rate;
360
361 return usecs;
362 }
363
364 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
365 struct snd_pcm_hw_params *params)
366 {
367 struct snd_pcm_runtime *runtime;
368 int err, usecs;
369 unsigned int bits;
370 snd_pcm_uframes_t frames;
371
372 if (PCM_RUNTIME_CHECK(substream))
373 return -ENXIO;
374 runtime = substream->runtime;
375 snd_pcm_stream_lock_irq(substream);
376 switch (runtime->status->state) {
377 case SNDRV_PCM_STATE_OPEN:
378 case SNDRV_PCM_STATE_SETUP:
379 case SNDRV_PCM_STATE_PREPARED:
380 break;
381 default:
382 snd_pcm_stream_unlock_irq(substream);
383 return -EBADFD;
384 }
385 snd_pcm_stream_unlock_irq(substream);
386 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
387 if (!substream->oss.oss)
388 #endif
389 if (atomic_read(&substream->mmap_count))
390 return -EBADFD;
391
392 params->rmask = ~0U;
393 err = snd_pcm_hw_refine(substream, params);
394 if (err < 0)
395 goto _error;
396
397 err = snd_pcm_hw_params_choose(substream, params);
398 if (err < 0)
399 goto _error;
400
401 if (substream->ops->hw_params != NULL) {
402 err = substream->ops->hw_params(substream, params);
403 if (err < 0)
404 goto _error;
405 }
406
407 runtime->access = params_access(params);
408 runtime->format = params_format(params);
409 runtime->subformat = params_subformat(params);
410 runtime->channels = params_channels(params);
411 runtime->rate = params_rate(params);
412 runtime->period_size = params_period_size(params);
413 runtime->periods = params_periods(params);
414 runtime->buffer_size = params_buffer_size(params);
415 runtime->info = params->info;
416 runtime->rate_num = params->rate_num;
417 runtime->rate_den = params->rate_den;
418
419 bits = snd_pcm_format_physical_width(runtime->format);
420 runtime->sample_bits = bits;
421 bits *= runtime->channels;
422 runtime->frame_bits = bits;
423 frames = 1;
424 while (bits % 8 != 0) {
425 bits *= 2;
426 frames *= 2;
427 }
428 runtime->byte_align = bits / 8;
429 runtime->min_align = frames;
430
431 /* Default sw params */
432 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
433 runtime->period_step = 1;
434 runtime->control->avail_min = runtime->period_size;
435 runtime->start_threshold = 1;
436 runtime->stop_threshold = runtime->buffer_size;
437 runtime->silence_threshold = 0;
438 runtime->silence_size = 0;
439 runtime->boundary = runtime->buffer_size;
440 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
441 runtime->boundary *= 2;
442
443 snd_pcm_timer_resolution_change(substream);
444 runtime->status->state = SNDRV_PCM_STATE_SETUP;
445
446 pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY,
447 substream->latency_id);
448 if ((usecs = period_to_usecs(runtime)) >= 0)
449 pm_qos_add_requirement(PM_QOS_CPU_DMA_LATENCY,
450 substream->latency_id, usecs);
451 return 0;
452 _error:
453 /* hardware might be unuseable from this time,
454 so we force application to retry to set
455 the correct hardware parameter settings */
456 runtime->status->state = SNDRV_PCM_STATE_OPEN;
457 if (substream->ops->hw_free != NULL)
458 substream->ops->hw_free(substream);
459 return err;
460 }
461
462 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
463 struct snd_pcm_hw_params __user * _params)
464 {
465 struct snd_pcm_hw_params *params;
466 int err;
467
468 params = kmalloc(sizeof(*params), GFP_KERNEL);
469 if (!params) {
470 err = -ENOMEM;
471 goto out;
472 }
473 if (copy_from_user(params, _params, sizeof(*params))) {
474 err = -EFAULT;
475 goto out;
476 }
477 err = snd_pcm_hw_params(substream, params);
478 if (copy_to_user(_params, params, sizeof(*params))) {
479 if (!err)
480 err = -EFAULT;
481 }
482 out:
483 kfree(params);
484 return err;
485 }
486
487 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
488 {
489 struct snd_pcm_runtime *runtime;
490 int result = 0;
491
492 if (PCM_RUNTIME_CHECK(substream))
493 return -ENXIO;
494 runtime = substream->runtime;
495 snd_pcm_stream_lock_irq(substream);
496 switch (runtime->status->state) {
497 case SNDRV_PCM_STATE_SETUP:
498 case SNDRV_PCM_STATE_PREPARED:
499 break;
500 default:
501 snd_pcm_stream_unlock_irq(substream);
502 return -EBADFD;
503 }
504 snd_pcm_stream_unlock_irq(substream);
505 if (atomic_read(&substream->mmap_count))
506 return -EBADFD;
507 if (substream->ops->hw_free)
508 result = substream->ops->hw_free(substream);
509 runtime->status->state = SNDRV_PCM_STATE_OPEN;
510 pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY,
511 substream->latency_id);
512 return result;
513 }
514
515 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
516 struct snd_pcm_sw_params *params)
517 {
518 struct snd_pcm_runtime *runtime;
519
520 if (PCM_RUNTIME_CHECK(substream))
521 return -ENXIO;
522 runtime = substream->runtime;
523 snd_pcm_stream_lock_irq(substream);
524 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
525 snd_pcm_stream_unlock_irq(substream);
526 return -EBADFD;
527 }
528 snd_pcm_stream_unlock_irq(substream);
529
530 if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
531 return -EINVAL;
532 if (params->avail_min == 0)
533 return -EINVAL;
534 if (params->silence_size >= runtime->boundary) {
535 if (params->silence_threshold != 0)
536 return -EINVAL;
537 } else {
538 if (params->silence_size > params->silence_threshold)
539 return -EINVAL;
540 if (params->silence_threshold > runtime->buffer_size)
541 return -EINVAL;
542 }
543 snd_pcm_stream_lock_irq(substream);
544 runtime->tstamp_mode = params->tstamp_mode;
545 runtime->period_step = params->period_step;
546 runtime->control->avail_min = params->avail_min;
547 runtime->start_threshold = params->start_threshold;
548 runtime->stop_threshold = params->stop_threshold;
549 runtime->silence_threshold = params->silence_threshold;
550 runtime->silence_size = params->silence_size;
551 params->boundary = runtime->boundary;
552 if (snd_pcm_running(substream)) {
553 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
554 runtime->silence_size > 0)
555 snd_pcm_playback_silence(substream, ULONG_MAX);
556 wake_up(&runtime->sleep);
557 }
558 snd_pcm_stream_unlock_irq(substream);
559 return 0;
560 }
561
562 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
563 struct snd_pcm_sw_params __user * _params)
564 {
565 struct snd_pcm_sw_params params;
566 int err;
567 if (copy_from_user(&params, _params, sizeof(params)))
568 return -EFAULT;
569 err = snd_pcm_sw_params(substream, &params);
570 if (copy_to_user(_params, &params, sizeof(params)))
571 return -EFAULT;
572 return err;
573 }
574
575 int snd_pcm_status(struct snd_pcm_substream *substream,
576 struct snd_pcm_status *status)
577 {
578 struct snd_pcm_runtime *runtime = substream->runtime;
579
580 snd_pcm_stream_lock_irq(substream);
581 status->state = runtime->status->state;
582 status->suspended_state = runtime->status->suspended_state;
583 if (status->state == SNDRV_PCM_STATE_OPEN)
584 goto _end;
585 status->trigger_tstamp = runtime->trigger_tstamp;
586 if (snd_pcm_running(substream)) {
587 snd_pcm_update_hw_ptr(substream);
588 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
589 status->tstamp = runtime->status->tstamp;
590 goto _tstamp_end;
591 }
592 }
593 snd_pcm_gettime(runtime, &status->tstamp);
594 _tstamp_end:
595 status->appl_ptr = runtime->control->appl_ptr;
596 status->hw_ptr = runtime->status->hw_ptr;
597 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
598 status->avail = snd_pcm_playback_avail(runtime);
599 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
600 runtime->status->state == SNDRV_PCM_STATE_DRAINING)
601 status->delay = runtime->buffer_size - status->avail;
602 else
603 status->delay = 0;
604 } else {
605 status->avail = snd_pcm_capture_avail(runtime);
606 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
607 status->delay = status->avail;
608 else
609 status->delay = 0;
610 }
611 status->avail_max = runtime->avail_max;
612 status->overrange = runtime->overrange;
613 runtime->avail_max = 0;
614 runtime->overrange = 0;
615 _end:
616 snd_pcm_stream_unlock_irq(substream);
617 return 0;
618 }
619
620 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
621 struct snd_pcm_status __user * _status)
622 {
623 struct snd_pcm_status status;
624 int res;
625
626 memset(&status, 0, sizeof(status));
627 res = snd_pcm_status(substream, &status);
628 if (res < 0)
629 return res;
630 if (copy_to_user(_status, &status, sizeof(status)))
631 return -EFAULT;
632 return 0;
633 }
634
635 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
636 struct snd_pcm_channel_info * info)
637 {
638 struct snd_pcm_runtime *runtime;
639 unsigned int channel;
640
641 channel = info->channel;
642 runtime = substream->runtime;
643 snd_pcm_stream_lock_irq(substream);
644 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
645 snd_pcm_stream_unlock_irq(substream);
646 return -EBADFD;
647 }
648 snd_pcm_stream_unlock_irq(substream);
649 if (channel >= runtime->channels)
650 return -EINVAL;
651 memset(info, 0, sizeof(*info));
652 info->channel = channel;
653 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
654 }
655
656 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
657 struct snd_pcm_channel_info __user * _info)
658 {
659 struct snd_pcm_channel_info info;
660 int res;
661
662 if (copy_from_user(&info, _info, sizeof(info)))
663 return -EFAULT;
664 res = snd_pcm_channel_info(substream, &info);
665 if (res < 0)
666 return res;
667 if (copy_to_user(_info, &info, sizeof(info)))
668 return -EFAULT;
669 return 0;
670 }
671
672 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
673 {
674 struct snd_pcm_runtime *runtime = substream->runtime;
675 if (runtime->trigger_master == NULL)
676 return;
677 if (runtime->trigger_master == substream) {
678 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
679 } else {
680 snd_pcm_trigger_tstamp(runtime->trigger_master);
681 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
682 }
683 runtime->trigger_master = NULL;
684 }
685
686 struct action_ops {
687 int (*pre_action)(struct snd_pcm_substream *substream, int state);
688 int (*do_action)(struct snd_pcm_substream *substream, int state);
689 void (*undo_action)(struct snd_pcm_substream *substream, int state);
690 void (*post_action)(struct snd_pcm_substream *substream, int state);
691 };
692
693 /*
694 * this functions is core for handling of linked stream
695 * Note: the stream state might be changed also on failure
696 * Note2: call with calling stream lock + link lock
697 */
698 static int snd_pcm_action_group(struct action_ops *ops,
699 struct snd_pcm_substream *substream,
700 int state, int do_lock)
701 {
702 struct snd_pcm_substream *s = NULL;
703 struct snd_pcm_substream *s1;
704 int res = 0;
705
706 snd_pcm_group_for_each_entry(s, substream) {
707 if (do_lock && s != substream)
708 spin_lock_nested(&s->self_group.lock,
709 SINGLE_DEPTH_NESTING);
710 res = ops->pre_action(s, state);
711 if (res < 0)
712 goto _unlock;
713 }
714 snd_pcm_group_for_each_entry(s, substream) {
715 res = ops->do_action(s, state);
716 if (res < 0) {
717 if (ops->undo_action) {
718 snd_pcm_group_for_each_entry(s1, substream) {
719 if (s1 == s) /* failed stream */
720 break;
721 ops->undo_action(s1, state);
722 }
723 }
724 s = NULL; /* unlock all */
725 goto _unlock;
726 }
727 }
728 snd_pcm_group_for_each_entry(s, substream) {
729 ops->post_action(s, state);
730 }
731 _unlock:
732 if (do_lock) {
733 /* unlock streams */
734 snd_pcm_group_for_each_entry(s1, substream) {
735 if (s1 != substream)
736 spin_unlock(&s1->self_group.lock);
737 if (s1 == s) /* end */
738 break;
739 }
740 }
741 return res;
742 }
743
744 /*
745 * Note: call with stream lock
746 */
747 static int snd_pcm_action_single(struct action_ops *ops,
748 struct snd_pcm_substream *substream,
749 int state)
750 {
751 int res;
752
753 res = ops->pre_action(substream, state);
754 if (res < 0)
755 return res;
756 res = ops->do_action(substream, state);
757 if (res == 0)
758 ops->post_action(substream, state);
759 else if (ops->undo_action)
760 ops->undo_action(substream, state);
761 return res;
762 }
763
764 /*
765 * Note: call with stream lock
766 */
767 static int snd_pcm_action(struct action_ops *ops,
768 struct snd_pcm_substream *substream,
769 int state)
770 {
771 int res;
772
773 if (snd_pcm_stream_linked(substream)) {
774 if (!spin_trylock(&substream->group->lock)) {
775 spin_unlock(&substream->self_group.lock);
776 spin_lock(&substream->group->lock);
777 spin_lock(&substream->self_group.lock);
778 }
779 res = snd_pcm_action_group(ops, substream, state, 1);
780 spin_unlock(&substream->group->lock);
781 } else {
782 res = snd_pcm_action_single(ops, substream, state);
783 }
784 return res;
785 }
786
787 /*
788 * Note: don't use any locks before
789 */
790 static int snd_pcm_action_lock_irq(struct action_ops *ops,
791 struct snd_pcm_substream *substream,
792 int state)
793 {
794 int res;
795
796 read_lock_irq(&snd_pcm_link_rwlock);
797 if (snd_pcm_stream_linked(substream)) {
798 spin_lock(&substream->group->lock);
799 spin_lock(&substream->self_group.lock);
800 res = snd_pcm_action_group(ops, substream, state, 1);
801 spin_unlock(&substream->self_group.lock);
802 spin_unlock(&substream->group->lock);
803 } else {
804 spin_lock(&substream->self_group.lock);
805 res = snd_pcm_action_single(ops, substream, state);
806 spin_unlock(&substream->self_group.lock);
807 }
808 read_unlock_irq(&snd_pcm_link_rwlock);
809 return res;
810 }
811
812 /*
813 */
814 static int snd_pcm_action_nonatomic(struct action_ops *ops,
815 struct snd_pcm_substream *substream,
816 int state)
817 {
818 int res;
819
820 down_read(&snd_pcm_link_rwsem);
821 if (snd_pcm_stream_linked(substream))
822 res = snd_pcm_action_group(ops, substream, state, 0);
823 else
824 res = snd_pcm_action_single(ops, substream, state);
825 up_read(&snd_pcm_link_rwsem);
826 return res;
827 }
828
829 /*
830 * start callbacks
831 */
832 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
833 {
834 struct snd_pcm_runtime *runtime = substream->runtime;
835 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
836 return -EBADFD;
837 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
838 !snd_pcm_playback_data(substream))
839 return -EPIPE;
840 runtime->trigger_master = substream;
841 return 0;
842 }
843
844 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
845 {
846 if (substream->runtime->trigger_master != substream)
847 return 0;
848 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
849 }
850
851 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
852 {
853 if (substream->runtime->trigger_master == substream)
854 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
855 }
856
857 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
858 {
859 struct snd_pcm_runtime *runtime = substream->runtime;
860 snd_pcm_trigger_tstamp(substream);
861 runtime->status->state = state;
862 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
863 runtime->silence_size > 0)
864 snd_pcm_playback_silence(substream, ULONG_MAX);
865 if (substream->timer)
866 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
867 &runtime->trigger_tstamp);
868 }
869
870 static struct action_ops snd_pcm_action_start = {
871 .pre_action = snd_pcm_pre_start,
872 .do_action = snd_pcm_do_start,
873 .undo_action = snd_pcm_undo_start,
874 .post_action = snd_pcm_post_start
875 };
876
877 /**
878 * snd_pcm_start
879 * @substream: the PCM substream instance
880 *
881 * Start all linked streams.
882 */
883 int snd_pcm_start(struct snd_pcm_substream *substream)
884 {
885 return snd_pcm_action(&snd_pcm_action_start, substream,
886 SNDRV_PCM_STATE_RUNNING);
887 }
888
889 /*
890 * stop callbacks
891 */
892 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
893 {
894 struct snd_pcm_runtime *runtime = substream->runtime;
895 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
896 return -EBADFD;
897 runtime->trigger_master = substream;
898 return 0;
899 }
900
901 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
902 {
903 if (substream->runtime->trigger_master == substream &&
904 snd_pcm_running(substream))
905 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
906 return 0; /* unconditonally stop all substreams */
907 }
908
909 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
910 {
911 struct snd_pcm_runtime *runtime = substream->runtime;
912 if (runtime->status->state != state) {
913 snd_pcm_trigger_tstamp(substream);
914 if (substream->timer)
915 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
916 &runtime->trigger_tstamp);
917 runtime->status->state = state;
918 }
919 wake_up(&runtime->sleep);
920 }
921
922 static struct action_ops snd_pcm_action_stop = {
923 .pre_action = snd_pcm_pre_stop,
924 .do_action = snd_pcm_do_stop,
925 .post_action = snd_pcm_post_stop
926 };
927
928 /**
929 * snd_pcm_stop
930 * @substream: the PCM substream instance
931 * @state: PCM state after stopping the stream
932 *
933 * Try to stop all running streams in the substream group.
934 * The state of each stream is changed to the given value after that unconditionally.
935 */
936 int snd_pcm_stop(struct snd_pcm_substream *substream, int state)
937 {
938 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
939 }
940
941 EXPORT_SYMBOL(snd_pcm_stop);
942
943 /**
944 * snd_pcm_drain_done
945 * @substream: the PCM substream
946 *
947 * Stop the DMA only when the given stream is playback.
948 * The state is changed to SETUP.
949 * Unlike snd_pcm_stop(), this affects only the given stream.
950 */
951 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
952 {
953 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
954 SNDRV_PCM_STATE_SETUP);
955 }
956
957 /*
958 * pause callbacks
959 */
960 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
961 {
962 struct snd_pcm_runtime *runtime = substream->runtime;
963 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
964 return -ENOSYS;
965 if (push) {
966 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
967 return -EBADFD;
968 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
969 return -EBADFD;
970 runtime->trigger_master = substream;
971 return 0;
972 }
973
974 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
975 {
976 if (substream->runtime->trigger_master != substream)
977 return 0;
978 return substream->ops->trigger(substream,
979 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
980 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
981 }
982
983 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
984 {
985 if (substream->runtime->trigger_master == substream)
986 substream->ops->trigger(substream,
987 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
988 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
989 }
990
991 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
992 {
993 struct snd_pcm_runtime *runtime = substream->runtime;
994 snd_pcm_trigger_tstamp(substream);
995 if (push) {
996 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
997 if (substream->timer)
998 snd_timer_notify(substream->timer,
999 SNDRV_TIMER_EVENT_MPAUSE,
1000 &runtime->trigger_tstamp);
1001 wake_up(&runtime->sleep);
1002 } else {
1003 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1004 if (substream->timer)
1005 snd_timer_notify(substream->timer,
1006 SNDRV_TIMER_EVENT_MCONTINUE,
1007 &runtime->trigger_tstamp);
1008 }
1009 }
1010
1011 static struct action_ops snd_pcm_action_pause = {
1012 .pre_action = snd_pcm_pre_pause,
1013 .do_action = snd_pcm_do_pause,
1014 .undo_action = snd_pcm_undo_pause,
1015 .post_action = snd_pcm_post_pause
1016 };
1017
1018 /*
1019 * Push/release the pause for all linked streams.
1020 */
1021 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1022 {
1023 return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1024 }
1025
1026 #ifdef CONFIG_PM
1027 /* suspend */
1028
1029 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1030 {
1031 struct snd_pcm_runtime *runtime = substream->runtime;
1032 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1033 return -EBUSY;
1034 runtime->trigger_master = substream;
1035 return 0;
1036 }
1037
1038 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1039 {
1040 struct snd_pcm_runtime *runtime = substream->runtime;
1041 if (runtime->trigger_master != substream)
1042 return 0;
1043 if (! snd_pcm_running(substream))
1044 return 0;
1045 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1046 return 0; /* suspend unconditionally */
1047 }
1048
1049 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1050 {
1051 struct snd_pcm_runtime *runtime = substream->runtime;
1052 snd_pcm_trigger_tstamp(substream);
1053 if (substream->timer)
1054 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1055 &runtime->trigger_tstamp);
1056 runtime->status->suspended_state = runtime->status->state;
1057 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1058 wake_up(&runtime->sleep);
1059 }
1060
1061 static struct action_ops snd_pcm_action_suspend = {
1062 .pre_action = snd_pcm_pre_suspend,
1063 .do_action = snd_pcm_do_suspend,
1064 .post_action = snd_pcm_post_suspend
1065 };
1066
1067 /**
1068 * snd_pcm_suspend
1069 * @substream: the PCM substream
1070 *
1071 * Trigger SUSPEND to all linked streams.
1072 * After this call, all streams are changed to SUSPENDED state.
1073 */
1074 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1075 {
1076 int err;
1077 unsigned long flags;
1078
1079 if (! substream)
1080 return 0;
1081
1082 snd_pcm_stream_lock_irqsave(substream, flags);
1083 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1084 snd_pcm_stream_unlock_irqrestore(substream, flags);
1085 return err;
1086 }
1087
1088 EXPORT_SYMBOL(snd_pcm_suspend);
1089
1090 /**
1091 * snd_pcm_suspend_all
1092 * @pcm: the PCM instance
1093 *
1094 * Trigger SUSPEND to all substreams in the given pcm.
1095 * After this call, all streams are changed to SUSPENDED state.
1096 */
1097 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1098 {
1099 struct snd_pcm_substream *substream;
1100 int stream, err = 0;
1101
1102 if (! pcm)
1103 return 0;
1104
1105 for (stream = 0; stream < 2; stream++) {
1106 for (substream = pcm->streams[stream].substream;
1107 substream; substream = substream->next) {
1108 /* FIXME: the open/close code should lock this as well */
1109 if (substream->runtime == NULL)
1110 continue;
1111 err = snd_pcm_suspend(substream);
1112 if (err < 0 && err != -EBUSY)
1113 return err;
1114 }
1115 }
1116 return 0;
1117 }
1118
1119 EXPORT_SYMBOL(snd_pcm_suspend_all);
1120
1121 /* resume */
1122
1123 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1124 {
1125 struct snd_pcm_runtime *runtime = substream->runtime;
1126 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1127 return -ENOSYS;
1128 runtime->trigger_master = substream;
1129 return 0;
1130 }
1131
1132 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1133 {
1134 struct snd_pcm_runtime *runtime = substream->runtime;
1135 if (runtime->trigger_master != substream)
1136 return 0;
1137 /* DMA not running previously? */
1138 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1139 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1140 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1141 return 0;
1142 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1143 }
1144
1145 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1146 {
1147 if (substream->runtime->trigger_master == substream &&
1148 snd_pcm_running(substream))
1149 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1150 }
1151
1152 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1153 {
1154 struct snd_pcm_runtime *runtime = substream->runtime;
1155 snd_pcm_trigger_tstamp(substream);
1156 if (substream->timer)
1157 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1158 &runtime->trigger_tstamp);
1159 runtime->status->state = runtime->status->suspended_state;
1160 }
1161
1162 static struct action_ops snd_pcm_action_resume = {
1163 .pre_action = snd_pcm_pre_resume,
1164 .do_action = snd_pcm_do_resume,
1165 .undo_action = snd_pcm_undo_resume,
1166 .post_action = snd_pcm_post_resume
1167 };
1168
1169 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1170 {
1171 struct snd_card *card = substream->pcm->card;
1172 int res;
1173
1174 snd_power_lock(card);
1175 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1176 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1177 snd_power_unlock(card);
1178 return res;
1179 }
1180
1181 #else
1182
1183 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1184 {
1185 return -ENOSYS;
1186 }
1187
1188 #endif /* CONFIG_PM */
1189
1190 /*
1191 * xrun ioctl
1192 *
1193 * Change the RUNNING stream(s) to XRUN state.
1194 */
1195 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1196 {
1197 struct snd_card *card = substream->pcm->card;
1198 struct snd_pcm_runtime *runtime = substream->runtime;
1199 int result;
1200
1201 snd_power_lock(card);
1202 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1203 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1204 if (result < 0)
1205 goto _unlock;
1206 }
1207
1208 snd_pcm_stream_lock_irq(substream);
1209 switch (runtime->status->state) {
1210 case SNDRV_PCM_STATE_XRUN:
1211 result = 0; /* already there */
1212 break;
1213 case SNDRV_PCM_STATE_RUNNING:
1214 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1215 break;
1216 default:
1217 result = -EBADFD;
1218 }
1219 snd_pcm_stream_unlock_irq(substream);
1220 _unlock:
1221 snd_power_unlock(card);
1222 return result;
1223 }
1224
1225 /*
1226 * reset ioctl
1227 */
1228 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1229 {
1230 struct snd_pcm_runtime *runtime = substream->runtime;
1231 switch (runtime->status->state) {
1232 case SNDRV_PCM_STATE_RUNNING:
1233 case SNDRV_PCM_STATE_PREPARED:
1234 case SNDRV_PCM_STATE_PAUSED:
1235 case SNDRV_PCM_STATE_SUSPENDED:
1236 return 0;
1237 default:
1238 return -EBADFD;
1239 }
1240 }
1241
1242 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1243 {
1244 struct snd_pcm_runtime *runtime = substream->runtime;
1245 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1246 if (err < 0)
1247 return err;
1248 runtime->hw_ptr_base = 0;
1249 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1250 runtime->status->hw_ptr % runtime->period_size;
1251 runtime->silence_start = runtime->status->hw_ptr;
1252 runtime->silence_filled = 0;
1253 return 0;
1254 }
1255
1256 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1257 {
1258 struct snd_pcm_runtime *runtime = substream->runtime;
1259 runtime->control->appl_ptr = runtime->status->hw_ptr;
1260 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1261 runtime->silence_size > 0)
1262 snd_pcm_playback_silence(substream, ULONG_MAX);
1263 }
1264
1265 static struct action_ops snd_pcm_action_reset = {
1266 .pre_action = snd_pcm_pre_reset,
1267 .do_action = snd_pcm_do_reset,
1268 .post_action = snd_pcm_post_reset
1269 };
1270
1271 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1272 {
1273 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1274 }
1275
1276 /*
1277 * prepare ioctl
1278 */
1279 /* we use the second argument for updating f_flags */
1280 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1281 int f_flags)
1282 {
1283 struct snd_pcm_runtime *runtime = substream->runtime;
1284 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1285 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1286 return -EBADFD;
1287 if (snd_pcm_running(substream))
1288 return -EBUSY;
1289 substream->f_flags = f_flags;
1290 return 0;
1291 }
1292
1293 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1294 {
1295 int err;
1296 err = substream->ops->prepare(substream);
1297 if (err < 0)
1298 return err;
1299 return snd_pcm_do_reset(substream, 0);
1300 }
1301
1302 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1303 {
1304 struct snd_pcm_runtime *runtime = substream->runtime;
1305 runtime->control->appl_ptr = runtime->status->hw_ptr;
1306 runtime->status->state = SNDRV_PCM_STATE_PREPARED;
1307 }
1308
1309 static struct action_ops snd_pcm_action_prepare = {
1310 .pre_action = snd_pcm_pre_prepare,
1311 .do_action = snd_pcm_do_prepare,
1312 .post_action = snd_pcm_post_prepare
1313 };
1314
1315 /**
1316 * snd_pcm_prepare
1317 * @substream: the PCM substream instance
1318 * @file: file to refer f_flags
1319 *
1320 * Prepare the PCM substream to be triggerable.
1321 */
1322 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1323 struct file *file)
1324 {
1325 int res;
1326 struct snd_card *card = substream->pcm->card;
1327 int f_flags;
1328
1329 if (file)
1330 f_flags = file->f_flags;
1331 else
1332 f_flags = substream->f_flags;
1333
1334 snd_power_lock(card);
1335 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1336 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1337 substream, f_flags);
1338 snd_power_unlock(card);
1339 return res;
1340 }
1341
1342 /*
1343 * drain ioctl
1344 */
1345
1346 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1347 {
1348 if (substream->f_flags & O_NONBLOCK)
1349 return -EAGAIN;
1350 substream->runtime->trigger_master = substream;
1351 return 0;
1352 }
1353
1354 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1355 {
1356 struct snd_pcm_runtime *runtime = substream->runtime;
1357 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1358 switch (runtime->status->state) {
1359 case SNDRV_PCM_STATE_PREPARED:
1360 /* start playback stream if possible */
1361 if (! snd_pcm_playback_empty(substream)) {
1362 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1363 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1364 }
1365 break;
1366 case SNDRV_PCM_STATE_RUNNING:
1367 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1368 break;
1369 default:
1370 break;
1371 }
1372 } else {
1373 /* stop running stream */
1374 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1375 int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1376 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1377 snd_pcm_do_stop(substream, new_state);
1378 snd_pcm_post_stop(substream, new_state);
1379 }
1380 }
1381 return 0;
1382 }
1383
1384 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1385 {
1386 }
1387
1388 static struct action_ops snd_pcm_action_drain_init = {
1389 .pre_action = snd_pcm_pre_drain_init,
1390 .do_action = snd_pcm_do_drain_init,
1391 .post_action = snd_pcm_post_drain_init
1392 };
1393
1394 struct drain_rec {
1395 struct snd_pcm_substream *substream;
1396 wait_queue_t wait;
1397 snd_pcm_uframes_t stop_threshold;
1398 };
1399
1400 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1401
1402 /*
1403 * Drain the stream(s).
1404 * When the substream is linked, sync until the draining of all playback streams
1405 * is finished.
1406 * After this call, all streams are supposed to be either SETUP or DRAINING
1407 * (capture only) state.
1408 */
1409 static int snd_pcm_drain(struct snd_pcm_substream *substream)
1410 {
1411 struct snd_card *card;
1412 struct snd_pcm_runtime *runtime;
1413 struct snd_pcm_substream *s;
1414 int result = 0;
1415 int i, num_drecs;
1416 struct drain_rec *drec, drec_tmp, *d;
1417
1418 card = substream->pcm->card;
1419 runtime = substream->runtime;
1420
1421 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1422 return -EBADFD;
1423
1424 snd_power_lock(card);
1425 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1426 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1427 if (result < 0) {
1428 snd_power_unlock(card);
1429 return result;
1430 }
1431 }
1432
1433 /* allocate temporary record for drain sync */
1434 down_read(&snd_pcm_link_rwsem);
1435 if (snd_pcm_stream_linked(substream)) {
1436 drec = kmalloc(substream->group->count * sizeof(*drec), GFP_KERNEL);
1437 if (! drec) {
1438 up_read(&snd_pcm_link_rwsem);
1439 snd_power_unlock(card);
1440 return -ENOMEM;
1441 }
1442 } else
1443 drec = &drec_tmp;
1444
1445 /* count only playback streams */
1446 num_drecs = 0;
1447 snd_pcm_group_for_each_entry(s, substream) {
1448 runtime = s->runtime;
1449 if (s->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1450 d = &drec[num_drecs++];
1451 d->substream = s;
1452 init_waitqueue_entry(&d->wait, current);
1453 add_wait_queue(&runtime->sleep, &d->wait);
1454 /* stop_threshold fixup to avoid endless loop when
1455 * stop_threshold > buffer_size
1456 */
1457 d->stop_threshold = runtime->stop_threshold;
1458 if (runtime->stop_threshold > runtime->buffer_size)
1459 runtime->stop_threshold = runtime->buffer_size;
1460 }
1461 }
1462 up_read(&snd_pcm_link_rwsem);
1463
1464 snd_pcm_stream_lock_irq(substream);
1465 /* resume pause */
1466 if (substream->runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1467 snd_pcm_pause(substream, 0);
1468
1469 /* pre-start/stop - all running streams are changed to DRAINING state */
1470 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1471 if (result < 0) {
1472 snd_pcm_stream_unlock_irq(substream);
1473 goto _error;
1474 }
1475
1476 for (;;) {
1477 long tout;
1478 if (signal_pending(current)) {
1479 result = -ERESTARTSYS;
1480 break;
1481 }
1482 /* all finished? */
1483 for (i = 0; i < num_drecs; i++) {
1484 runtime = drec[i].substream->runtime;
1485 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING)
1486 break;
1487 }
1488 if (i == num_drecs)
1489 break; /* yes, all drained */
1490
1491 set_current_state(TASK_INTERRUPTIBLE);
1492 snd_pcm_stream_unlock_irq(substream);
1493 snd_power_unlock(card);
1494 tout = schedule_timeout(10 * HZ);
1495 snd_power_lock(card);
1496 snd_pcm_stream_lock_irq(substream);
1497 if (tout == 0) {
1498 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1499 result = -ESTRPIPE;
1500 else {
1501 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1502 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1503 result = -EIO;
1504 }
1505 break;
1506 }
1507 }
1508
1509 snd_pcm_stream_unlock_irq(substream);
1510
1511 _error:
1512 for (i = 0; i < num_drecs; i++) {
1513 d = &drec[i];
1514 runtime = d->substream->runtime;
1515 remove_wait_queue(&runtime->sleep, &d->wait);
1516 runtime->stop_threshold = d->stop_threshold;
1517 }
1518
1519 if (drec != &drec_tmp)
1520 kfree(drec);
1521 snd_power_unlock(card);
1522
1523 return result;
1524 }
1525
1526 /*
1527 * drop ioctl
1528 *
1529 * Immediately put all linked substreams into SETUP state.
1530 */
1531 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1532 {
1533 struct snd_pcm_runtime *runtime;
1534 struct snd_card *card;
1535 int result = 0;
1536
1537 if (PCM_RUNTIME_CHECK(substream))
1538 return -ENXIO;
1539 runtime = substream->runtime;
1540 card = substream->pcm->card;
1541
1542 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1543 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1544 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1545 return -EBADFD;
1546
1547 snd_pcm_stream_lock_irq(substream);
1548 /* resume pause */
1549 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1550 snd_pcm_pause(substream, 0);
1551
1552 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1553 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1554 snd_pcm_stream_unlock_irq(substream);
1555
1556 return result;
1557 }
1558
1559
1560 /* WARNING: Don't forget to fput back the file */
1561 static struct file *snd_pcm_file_fd(int fd)
1562 {
1563 struct file *file;
1564 struct inode *inode;
1565 unsigned int minor;
1566
1567 file = fget(fd);
1568 if (!file)
1569 return NULL;
1570 inode = file->f_path.dentry->d_inode;
1571 if (!S_ISCHR(inode->i_mode) ||
1572 imajor(inode) != snd_major) {
1573 fput(file);
1574 return NULL;
1575 }
1576 minor = iminor(inode);
1577 if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1578 !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1579 fput(file);
1580 return NULL;
1581 }
1582 return file;
1583 }
1584
1585 /*
1586 * PCM link handling
1587 */
1588 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1589 {
1590 int res = 0;
1591 struct file *file;
1592 struct snd_pcm_file *pcm_file;
1593 struct snd_pcm_substream *substream1;
1594
1595 file = snd_pcm_file_fd(fd);
1596 if (!file)
1597 return -EBADFD;
1598 pcm_file = file->private_data;
1599 substream1 = pcm_file->substream;
1600 down_write(&snd_pcm_link_rwsem);
1601 write_lock_irq(&snd_pcm_link_rwlock);
1602 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1603 substream->runtime->status->state != substream1->runtime->status->state) {
1604 res = -EBADFD;
1605 goto _end;
1606 }
1607 if (snd_pcm_stream_linked(substream1)) {
1608 res = -EALREADY;
1609 goto _end;
1610 }
1611 if (!snd_pcm_stream_linked(substream)) {
1612 substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC);
1613 if (substream->group == NULL) {
1614 res = -ENOMEM;
1615 goto _end;
1616 }
1617 spin_lock_init(&substream->group->lock);
1618 INIT_LIST_HEAD(&substream->group->substreams);
1619 list_add_tail(&substream->link_list, &substream->group->substreams);
1620 substream->group->count = 1;
1621 }
1622 list_add_tail(&substream1->link_list, &substream->group->substreams);
1623 substream->group->count++;
1624 substream1->group = substream->group;
1625 _end:
1626 write_unlock_irq(&snd_pcm_link_rwlock);
1627 up_write(&snd_pcm_link_rwsem);
1628 fput(file);
1629 return res;
1630 }
1631
1632 static void relink_to_local(struct snd_pcm_substream *substream)
1633 {
1634 substream->group = &substream->self_group;
1635 INIT_LIST_HEAD(&substream->self_group.substreams);
1636 list_add_tail(&substream->link_list, &substream->self_group.substreams);
1637 }
1638
1639 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1640 {
1641 struct snd_pcm_substream *s;
1642 int res = 0;
1643
1644 down_write(&snd_pcm_link_rwsem);
1645 write_lock_irq(&snd_pcm_link_rwlock);
1646 if (!snd_pcm_stream_linked(substream)) {
1647 res = -EALREADY;
1648 goto _end;
1649 }
1650 list_del(&substream->link_list);
1651 substream->group->count--;
1652 if (substream->group->count == 1) { /* detach the last stream, too */
1653 snd_pcm_group_for_each_entry(s, substream) {
1654 relink_to_local(s);
1655 break;
1656 }
1657 kfree(substream->group);
1658 }
1659 relink_to_local(substream);
1660 _end:
1661 write_unlock_irq(&snd_pcm_link_rwlock);
1662 up_write(&snd_pcm_link_rwsem);
1663 return res;
1664 }
1665
1666 /*
1667 * hw configurator
1668 */
1669 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1670 struct snd_pcm_hw_rule *rule)
1671 {
1672 struct snd_interval t;
1673 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1674 hw_param_interval_c(params, rule->deps[1]), &t);
1675 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1676 }
1677
1678 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1679 struct snd_pcm_hw_rule *rule)
1680 {
1681 struct snd_interval t;
1682 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1683 hw_param_interval_c(params, rule->deps[1]), &t);
1684 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1685 }
1686
1687 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1688 struct snd_pcm_hw_rule *rule)
1689 {
1690 struct snd_interval t;
1691 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1692 hw_param_interval_c(params, rule->deps[1]),
1693 (unsigned long) rule->private, &t);
1694 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1695 }
1696
1697 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1698 struct snd_pcm_hw_rule *rule)
1699 {
1700 struct snd_interval t;
1701 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1702 (unsigned long) rule->private,
1703 hw_param_interval_c(params, rule->deps[1]), &t);
1704 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1705 }
1706
1707 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1708 struct snd_pcm_hw_rule *rule)
1709 {
1710 unsigned int k;
1711 struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1712 struct snd_mask m;
1713 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1714 snd_mask_any(&m);
1715 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1716 int bits;
1717 if (! snd_mask_test(mask, k))
1718 continue;
1719 bits = snd_pcm_format_physical_width(k);
1720 if (bits <= 0)
1721 continue; /* ignore invalid formats */
1722 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1723 snd_mask_reset(&m, k);
1724 }
1725 return snd_mask_refine(mask, &m);
1726 }
1727
1728 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1729 struct snd_pcm_hw_rule *rule)
1730 {
1731 struct snd_interval t;
1732 unsigned int k;
1733 t.min = UINT_MAX;
1734 t.max = 0;
1735 t.openmin = 0;
1736 t.openmax = 0;
1737 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1738 int bits;
1739 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1740 continue;
1741 bits = snd_pcm_format_physical_width(k);
1742 if (bits <= 0)
1743 continue; /* ignore invalid formats */
1744 if (t.min > (unsigned)bits)
1745 t.min = bits;
1746 if (t.max < (unsigned)bits)
1747 t.max = bits;
1748 }
1749 t.integer = 1;
1750 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1751 }
1752
1753 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1754 #error "Change this table"
1755 #endif
1756
1757 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1758 48000, 64000, 88200, 96000, 176400, 192000 };
1759
1760 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1761 .count = ARRAY_SIZE(rates),
1762 .list = rates,
1763 };
1764
1765 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1766 struct snd_pcm_hw_rule *rule)
1767 {
1768 struct snd_pcm_hardware *hw = rule->private;
1769 return snd_interval_list(hw_param_interval(params, rule->var),
1770 snd_pcm_known_rates.count,
1771 snd_pcm_known_rates.list, hw->rates);
1772 }
1773
1774 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1775 struct snd_pcm_hw_rule *rule)
1776 {
1777 struct snd_interval t;
1778 struct snd_pcm_substream *substream = rule->private;
1779 t.min = 0;
1780 t.max = substream->buffer_bytes_max;
1781 t.openmin = 0;
1782 t.openmax = 0;
1783 t.integer = 1;
1784 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1785 }
1786
1787 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1788 {
1789 struct snd_pcm_runtime *runtime = substream->runtime;
1790 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1791 int k, err;
1792
1793 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1794 snd_mask_any(constrs_mask(constrs, k));
1795 }
1796
1797 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1798 snd_interval_any(constrs_interval(constrs, k));
1799 }
1800
1801 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1802 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1803 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1804 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1805 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1806
1807 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1808 snd_pcm_hw_rule_format, NULL,
1809 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1810 if (err < 0)
1811 return err;
1812 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1813 snd_pcm_hw_rule_sample_bits, NULL,
1814 SNDRV_PCM_HW_PARAM_FORMAT,
1815 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1816 if (err < 0)
1817 return err;
1818 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1819 snd_pcm_hw_rule_div, NULL,
1820 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1821 if (err < 0)
1822 return err;
1823 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1824 snd_pcm_hw_rule_mul, NULL,
1825 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1826 if (err < 0)
1827 return err;
1828 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1829 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1830 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1831 if (err < 0)
1832 return err;
1833 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1834 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1835 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1836 if (err < 0)
1837 return err;
1838 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1839 snd_pcm_hw_rule_div, NULL,
1840 SNDRV_PCM_HW_PARAM_FRAME_BITS, 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_RATE,
1844 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1845 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1846 if (err < 0)
1847 return err;
1848 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1849 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1850 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1851 if (err < 0)
1852 return err;
1853 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1854 snd_pcm_hw_rule_div, NULL,
1855 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1856 if (err < 0)
1857 return err;
1858 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1859 snd_pcm_hw_rule_div, NULL,
1860 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1861 if (err < 0)
1862 return err;
1863 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1864 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1865 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1866 if (err < 0)
1867 return err;
1868 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1869 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1870 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1871 if (err < 0)
1872 return err;
1873 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1874 snd_pcm_hw_rule_mul, NULL,
1875 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1876 if (err < 0)
1877 return err;
1878 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1879 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1880 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1881 if (err < 0)
1882 return err;
1883 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1884 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1885 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1886 if (err < 0)
1887 return err;
1888 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1889 snd_pcm_hw_rule_muldivk, (void*) 8,
1890 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1891 if (err < 0)
1892 return err;
1893 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1894 snd_pcm_hw_rule_muldivk, (void*) 8,
1895 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1896 if (err < 0)
1897 return err;
1898 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1899 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1900 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1901 if (err < 0)
1902 return err;
1903 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1904 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1905 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1906 if (err < 0)
1907 return err;
1908 return 0;
1909 }
1910
1911 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1912 {
1913 struct snd_pcm_runtime *runtime = substream->runtime;
1914 struct snd_pcm_hardware *hw = &runtime->hw;
1915 int err;
1916 unsigned int mask = 0;
1917
1918 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1919 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1920 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1921 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1922 if (hw->info & SNDRV_PCM_INFO_MMAP) {
1923 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1924 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1925 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1926 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1927 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1928 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1929 }
1930 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1931 if (err < 0)
1932 return err;
1933
1934 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1935 if (err < 0)
1936 return err;
1937
1938 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1939 if (err < 0)
1940 return err;
1941
1942 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1943 hw->channels_min, hw->channels_max);
1944 if (err < 0)
1945 return err;
1946
1947 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1948 hw->rate_min, hw->rate_max);
1949 if (err < 0)
1950 return err;
1951
1952 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1953 hw->period_bytes_min, hw->period_bytes_max);
1954 if (err < 0)
1955 return err;
1956
1957 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1958 hw->periods_min, hw->periods_max);
1959 if (err < 0)
1960 return err;
1961
1962 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1963 hw->period_bytes_min, hw->buffer_bytes_max);
1964 if (err < 0)
1965 return err;
1966
1967 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1968 snd_pcm_hw_rule_buffer_bytes_max, substream,
1969 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1970 if (err < 0)
1971 return err;
1972
1973 /* FIXME: remove */
1974 if (runtime->dma_bytes) {
1975 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
1976 if (err < 0)
1977 return -EINVAL;
1978 }
1979
1980 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
1981 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1982 snd_pcm_hw_rule_rate, hw,
1983 SNDRV_PCM_HW_PARAM_RATE, -1);
1984 if (err < 0)
1985 return err;
1986 }
1987
1988 /* FIXME: this belong to lowlevel */
1989 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
1990
1991 return 0;
1992 }
1993
1994 static void pcm_release_private(struct snd_pcm_substream *substream)
1995 {
1996 snd_pcm_unlink(substream);
1997 }
1998
1999 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2000 {
2001 substream->ref_count--;
2002 if (substream->ref_count > 0)
2003 return;
2004
2005 snd_pcm_drop(substream);
2006 if (substream->hw_opened) {
2007 if (substream->ops->hw_free != NULL)
2008 substream->ops->hw_free(substream);
2009 substream->ops->close(substream);
2010 substream->hw_opened = 0;
2011 }
2012 if (substream->pcm_release) {
2013 substream->pcm_release(substream);
2014 substream->pcm_release = NULL;
2015 }
2016 snd_pcm_detach_substream(substream);
2017 }
2018
2019 EXPORT_SYMBOL(snd_pcm_release_substream);
2020
2021 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2022 struct file *file,
2023 struct snd_pcm_substream **rsubstream)
2024 {
2025 struct snd_pcm_substream *substream;
2026 int err;
2027
2028 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2029 if (err < 0)
2030 return err;
2031 if (substream->ref_count > 1) {
2032 *rsubstream = substream;
2033 return 0;
2034 }
2035
2036 err = snd_pcm_hw_constraints_init(substream);
2037 if (err < 0) {
2038 snd_printd("snd_pcm_hw_constraints_init failed\n");
2039 goto error;
2040 }
2041
2042 if ((err = substream->ops->open(substream)) < 0)
2043 goto error;
2044
2045 substream->hw_opened = 1;
2046
2047 err = snd_pcm_hw_constraints_complete(substream);
2048 if (err < 0) {
2049 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2050 goto error;
2051 }
2052
2053 *rsubstream = substream;
2054 return 0;
2055
2056 error:
2057 snd_pcm_release_substream(substream);
2058 return err;
2059 }
2060
2061 EXPORT_SYMBOL(snd_pcm_open_substream);
2062
2063 static int snd_pcm_open_file(struct file *file,
2064 struct snd_pcm *pcm,
2065 int stream,
2066 struct snd_pcm_file **rpcm_file)
2067 {
2068 struct snd_pcm_file *pcm_file;
2069 struct snd_pcm_substream *substream;
2070 struct snd_pcm_str *str;
2071 int err;
2072
2073 if (rpcm_file)
2074 *rpcm_file = NULL;
2075
2076 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2077 if (err < 0)
2078 return err;
2079
2080 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2081 if (pcm_file == NULL) {
2082 snd_pcm_release_substream(substream);
2083 return -ENOMEM;
2084 }
2085 pcm_file->substream = substream;
2086 if (substream->ref_count == 1) {
2087 str = substream->pstr;
2088 substream->file = pcm_file;
2089 substream->pcm_release = pcm_release_private;
2090 }
2091 file->private_data = pcm_file;
2092 if (rpcm_file)
2093 *rpcm_file = pcm_file;
2094 return 0;
2095 }
2096
2097 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2098 {
2099 struct snd_pcm *pcm;
2100
2101 pcm = snd_lookup_minor_data(iminor(inode),
2102 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2103 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2104 }
2105
2106 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2107 {
2108 struct snd_pcm *pcm;
2109
2110 pcm = snd_lookup_minor_data(iminor(inode),
2111 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2112 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2113 }
2114
2115 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2116 {
2117 int err;
2118 struct snd_pcm_file *pcm_file;
2119 wait_queue_t wait;
2120
2121 if (pcm == NULL) {
2122 err = -ENODEV;
2123 goto __error1;
2124 }
2125 err = snd_card_file_add(pcm->card, file);
2126 if (err < 0)
2127 goto __error1;
2128 if (!try_module_get(pcm->card->module)) {
2129 err = -EFAULT;
2130 goto __error2;
2131 }
2132 init_waitqueue_entry(&wait, current);
2133 add_wait_queue(&pcm->open_wait, &wait);
2134 mutex_lock(&pcm->open_mutex);
2135 while (1) {
2136 err = snd_pcm_open_file(file, pcm, stream, &pcm_file);
2137 if (err >= 0)
2138 break;
2139 if (err == -EAGAIN) {
2140 if (file->f_flags & O_NONBLOCK) {
2141 err = -EBUSY;
2142 break;
2143 }
2144 } else
2145 break;
2146 set_current_state(TASK_INTERRUPTIBLE);
2147 mutex_unlock(&pcm->open_mutex);
2148 schedule();
2149 mutex_lock(&pcm->open_mutex);
2150 if (signal_pending(current)) {
2151 err = -ERESTARTSYS;
2152 break;
2153 }
2154 }
2155 remove_wait_queue(&pcm->open_wait, &wait);
2156 mutex_unlock(&pcm->open_mutex);
2157 if (err < 0)
2158 goto __error;
2159 return err;
2160
2161 __error:
2162 module_put(pcm->card->module);
2163 __error2:
2164 snd_card_file_remove(pcm->card, file);
2165 __error1:
2166 return err;
2167 }
2168
2169 static int snd_pcm_release(struct inode *inode, struct file *file)
2170 {
2171 struct snd_pcm *pcm;
2172 struct snd_pcm_substream *substream;
2173 struct snd_pcm_file *pcm_file;
2174
2175 pcm_file = file->private_data;
2176 substream = pcm_file->substream;
2177 if (snd_BUG_ON(!substream))
2178 return -ENXIO;
2179 pcm = substream->pcm;
2180 fasync_helper(-1, file, 0, &substream->runtime->fasync);
2181 mutex_lock(&pcm->open_mutex);
2182 snd_pcm_release_substream(substream);
2183 kfree(pcm_file);
2184 mutex_unlock(&pcm->open_mutex);
2185 wake_up(&pcm->open_wait);
2186 module_put(pcm->card->module);
2187 snd_card_file_remove(pcm->card, file);
2188 return 0;
2189 }
2190
2191 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2192 snd_pcm_uframes_t frames)
2193 {
2194 struct snd_pcm_runtime *runtime = substream->runtime;
2195 snd_pcm_sframes_t appl_ptr;
2196 snd_pcm_sframes_t ret;
2197 snd_pcm_sframes_t hw_avail;
2198
2199 if (frames == 0)
2200 return 0;
2201
2202 snd_pcm_stream_lock_irq(substream);
2203 switch (runtime->status->state) {
2204 case SNDRV_PCM_STATE_PREPARED:
2205 break;
2206 case SNDRV_PCM_STATE_DRAINING:
2207 case SNDRV_PCM_STATE_RUNNING:
2208 if (snd_pcm_update_hw_ptr(substream) >= 0)
2209 break;
2210 /* Fall through */
2211 case SNDRV_PCM_STATE_XRUN:
2212 ret = -EPIPE;
2213 goto __end;
2214 default:
2215 ret = -EBADFD;
2216 goto __end;
2217 }
2218
2219 hw_avail = snd_pcm_playback_hw_avail(runtime);
2220 if (hw_avail <= 0) {
2221 ret = 0;
2222 goto __end;
2223 }
2224 if (frames > (snd_pcm_uframes_t)hw_avail)
2225 frames = hw_avail;
2226 appl_ptr = runtime->control->appl_ptr - frames;
2227 if (appl_ptr < 0)
2228 appl_ptr += runtime->boundary;
2229 runtime->control->appl_ptr = appl_ptr;
2230 ret = frames;
2231 __end:
2232 snd_pcm_stream_unlock_irq(substream);
2233 return ret;
2234 }
2235
2236 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2237 snd_pcm_uframes_t frames)
2238 {
2239 struct snd_pcm_runtime *runtime = substream->runtime;
2240 snd_pcm_sframes_t appl_ptr;
2241 snd_pcm_sframes_t ret;
2242 snd_pcm_sframes_t hw_avail;
2243
2244 if (frames == 0)
2245 return 0;
2246
2247 snd_pcm_stream_lock_irq(substream);
2248 switch (runtime->status->state) {
2249 case SNDRV_PCM_STATE_PREPARED:
2250 case SNDRV_PCM_STATE_DRAINING:
2251 break;
2252 case SNDRV_PCM_STATE_RUNNING:
2253 if (snd_pcm_update_hw_ptr(substream) >= 0)
2254 break;
2255 /* Fall through */
2256 case SNDRV_PCM_STATE_XRUN:
2257 ret = -EPIPE;
2258 goto __end;
2259 default:
2260 ret = -EBADFD;
2261 goto __end;
2262 }
2263
2264 hw_avail = snd_pcm_capture_hw_avail(runtime);
2265 if (hw_avail <= 0) {
2266 ret = 0;
2267 goto __end;
2268 }
2269 if (frames > (snd_pcm_uframes_t)hw_avail)
2270 frames = hw_avail;
2271 appl_ptr = runtime->control->appl_ptr - frames;
2272 if (appl_ptr < 0)
2273 appl_ptr += runtime->boundary;
2274 runtime->control->appl_ptr = appl_ptr;
2275 ret = frames;
2276 __end:
2277 snd_pcm_stream_unlock_irq(substream);
2278 return ret;
2279 }
2280
2281 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2282 snd_pcm_uframes_t frames)
2283 {
2284 struct snd_pcm_runtime *runtime = substream->runtime;
2285 snd_pcm_sframes_t appl_ptr;
2286 snd_pcm_sframes_t ret;
2287 snd_pcm_sframes_t avail;
2288
2289 if (frames == 0)
2290 return 0;
2291
2292 snd_pcm_stream_lock_irq(substream);
2293 switch (runtime->status->state) {
2294 case SNDRV_PCM_STATE_PREPARED:
2295 case SNDRV_PCM_STATE_PAUSED:
2296 break;
2297 case SNDRV_PCM_STATE_DRAINING:
2298 case SNDRV_PCM_STATE_RUNNING:
2299 if (snd_pcm_update_hw_ptr(substream) >= 0)
2300 break;
2301 /* Fall through */
2302 case SNDRV_PCM_STATE_XRUN:
2303 ret = -EPIPE;
2304 goto __end;
2305 default:
2306 ret = -EBADFD;
2307 goto __end;
2308 }
2309
2310 avail = snd_pcm_playback_avail(runtime);
2311 if (avail <= 0) {
2312 ret = 0;
2313 goto __end;
2314 }
2315 if (frames > (snd_pcm_uframes_t)avail)
2316 frames = avail;
2317 appl_ptr = runtime->control->appl_ptr + frames;
2318 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2319 appl_ptr -= runtime->boundary;
2320 runtime->control->appl_ptr = appl_ptr;
2321 ret = frames;
2322 __end:
2323 snd_pcm_stream_unlock_irq(substream);
2324 return ret;
2325 }
2326
2327 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2328 snd_pcm_uframes_t frames)
2329 {
2330 struct snd_pcm_runtime *runtime = substream->runtime;
2331 snd_pcm_sframes_t appl_ptr;
2332 snd_pcm_sframes_t ret;
2333 snd_pcm_sframes_t avail;
2334
2335 if (frames == 0)
2336 return 0;
2337
2338 snd_pcm_stream_lock_irq(substream);
2339 switch (runtime->status->state) {
2340 case SNDRV_PCM_STATE_PREPARED:
2341 case SNDRV_PCM_STATE_DRAINING:
2342 case SNDRV_PCM_STATE_PAUSED:
2343 break;
2344 case SNDRV_PCM_STATE_RUNNING:
2345 if (snd_pcm_update_hw_ptr(substream) >= 0)
2346 break;
2347 /* Fall through */
2348 case SNDRV_PCM_STATE_XRUN:
2349 ret = -EPIPE;
2350 goto __end;
2351 default:
2352 ret = -EBADFD;
2353 goto __end;
2354 }
2355
2356 avail = snd_pcm_capture_avail(runtime);
2357 if (avail <= 0) {
2358 ret = 0;
2359 goto __end;
2360 }
2361 if (frames > (snd_pcm_uframes_t)avail)
2362 frames = avail;
2363 appl_ptr = runtime->control->appl_ptr + frames;
2364 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2365 appl_ptr -= runtime->boundary;
2366 runtime->control->appl_ptr = appl_ptr;
2367 ret = frames;
2368 __end:
2369 snd_pcm_stream_unlock_irq(substream);
2370 return ret;
2371 }
2372
2373 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2374 {
2375 struct snd_pcm_runtime *runtime = substream->runtime;
2376 int err;
2377
2378 snd_pcm_stream_lock_irq(substream);
2379 switch (runtime->status->state) {
2380 case SNDRV_PCM_STATE_DRAINING:
2381 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2382 goto __badfd;
2383 case SNDRV_PCM_STATE_RUNNING:
2384 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2385 break;
2386 /* Fall through */
2387 case SNDRV_PCM_STATE_PREPARED:
2388 case SNDRV_PCM_STATE_SUSPENDED:
2389 err = 0;
2390 break;
2391 case SNDRV_PCM_STATE_XRUN:
2392 err = -EPIPE;
2393 break;
2394 default:
2395 __badfd:
2396 err = -EBADFD;
2397 break;
2398 }
2399 snd_pcm_stream_unlock_irq(substream);
2400 return err;
2401 }
2402
2403 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2404 snd_pcm_sframes_t __user *res)
2405 {
2406 struct snd_pcm_runtime *runtime = substream->runtime;
2407 int err;
2408 snd_pcm_sframes_t n = 0;
2409
2410 snd_pcm_stream_lock_irq(substream);
2411 switch (runtime->status->state) {
2412 case SNDRV_PCM_STATE_DRAINING:
2413 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2414 goto __badfd;
2415 case SNDRV_PCM_STATE_RUNNING:
2416 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2417 break;
2418 /* Fall through */
2419 case SNDRV_PCM_STATE_PREPARED:
2420 case SNDRV_PCM_STATE_SUSPENDED:
2421 err = 0;
2422 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2423 n = snd_pcm_playback_hw_avail(runtime);
2424 else
2425 n = snd_pcm_capture_avail(runtime);
2426 break;
2427 case SNDRV_PCM_STATE_XRUN:
2428 err = -EPIPE;
2429 break;
2430 default:
2431 __badfd:
2432 err = -EBADFD;
2433 break;
2434 }
2435 snd_pcm_stream_unlock_irq(substream);
2436 if (!err)
2437 if (put_user(n, res))
2438 err = -EFAULT;
2439 return err;
2440 }
2441
2442 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2443 struct snd_pcm_sync_ptr __user *_sync_ptr)
2444 {
2445 struct snd_pcm_runtime *runtime = substream->runtime;
2446 struct snd_pcm_sync_ptr sync_ptr;
2447 volatile struct snd_pcm_mmap_status *status;
2448 volatile struct snd_pcm_mmap_control *control;
2449 int err;
2450
2451 memset(&sync_ptr, 0, sizeof(sync_ptr));
2452 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2453 return -EFAULT;
2454 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2455 return -EFAULT;
2456 status = runtime->status;
2457 control = runtime->control;
2458 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2459 err = snd_pcm_hwsync(substream);
2460 if (err < 0)
2461 return err;
2462 }
2463 snd_pcm_stream_lock_irq(substream);
2464 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2465 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2466 else
2467 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2468 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2469 control->avail_min = sync_ptr.c.control.avail_min;
2470 else
2471 sync_ptr.c.control.avail_min = control->avail_min;
2472 sync_ptr.s.status.state = status->state;
2473 sync_ptr.s.status.hw_ptr = status->hw_ptr;
2474 sync_ptr.s.status.tstamp = status->tstamp;
2475 sync_ptr.s.status.suspended_state = status->suspended_state;
2476 snd_pcm_stream_unlock_irq(substream);
2477 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2478 return -EFAULT;
2479 return 0;
2480 }
2481
2482 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2483 {
2484 struct snd_pcm_runtime *runtime = substream->runtime;
2485 int arg;
2486
2487 if (get_user(arg, _arg))
2488 return -EFAULT;
2489 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2490 return -EINVAL;
2491 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2492 if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2493 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2494 return 0;
2495 }
2496
2497 static int snd_pcm_common_ioctl1(struct file *file,
2498 struct snd_pcm_substream *substream,
2499 unsigned int cmd, void __user *arg)
2500 {
2501 switch (cmd) {
2502 case SNDRV_PCM_IOCTL_PVERSION:
2503 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2504 case SNDRV_PCM_IOCTL_INFO:
2505 return snd_pcm_info_user(substream, arg);
2506 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2507 return 0;
2508 case SNDRV_PCM_IOCTL_TTSTAMP:
2509 return snd_pcm_tstamp(substream, arg);
2510 case SNDRV_PCM_IOCTL_HW_REFINE:
2511 return snd_pcm_hw_refine_user(substream, arg);
2512 case SNDRV_PCM_IOCTL_HW_PARAMS:
2513 return snd_pcm_hw_params_user(substream, arg);
2514 case SNDRV_PCM_IOCTL_HW_FREE:
2515 return snd_pcm_hw_free(substream);
2516 case SNDRV_PCM_IOCTL_SW_PARAMS:
2517 return snd_pcm_sw_params_user(substream, arg);
2518 case SNDRV_PCM_IOCTL_STATUS:
2519 return snd_pcm_status_user(substream, arg);
2520 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2521 return snd_pcm_channel_info_user(substream, arg);
2522 case SNDRV_PCM_IOCTL_PREPARE:
2523 return snd_pcm_prepare(substream, file);
2524 case SNDRV_PCM_IOCTL_RESET:
2525 return snd_pcm_reset(substream);
2526 case SNDRV_PCM_IOCTL_START:
2527 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2528 case SNDRV_PCM_IOCTL_LINK:
2529 return snd_pcm_link(substream, (int)(unsigned long) arg);
2530 case SNDRV_PCM_IOCTL_UNLINK:
2531 return snd_pcm_unlink(substream);
2532 case SNDRV_PCM_IOCTL_RESUME:
2533 return snd_pcm_resume(substream);
2534 case SNDRV_PCM_IOCTL_XRUN:
2535 return snd_pcm_xrun(substream);
2536 case SNDRV_PCM_IOCTL_HWSYNC:
2537 return snd_pcm_hwsync(substream);
2538 case SNDRV_PCM_IOCTL_DELAY:
2539 return snd_pcm_delay(substream, arg);
2540 case SNDRV_PCM_IOCTL_SYNC_PTR:
2541 return snd_pcm_sync_ptr(substream, arg);
2542 #ifdef CONFIG_SND_SUPPORT_OLD_API
2543 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2544 return snd_pcm_hw_refine_old_user(substream, arg);
2545 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2546 return snd_pcm_hw_params_old_user(substream, arg);
2547 #endif
2548 case SNDRV_PCM_IOCTL_DRAIN:
2549 return snd_pcm_drain(substream);
2550 case SNDRV_PCM_IOCTL_DROP:
2551 return snd_pcm_drop(substream);
2552 case SNDRV_PCM_IOCTL_PAUSE:
2553 {
2554 int res;
2555 snd_pcm_stream_lock_irq(substream);
2556 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2557 snd_pcm_stream_unlock_irq(substream);
2558 return res;
2559 }
2560 }
2561 snd_printd("unknown ioctl = 0x%x\n", cmd);
2562 return -ENOTTY;
2563 }
2564
2565 static int snd_pcm_playback_ioctl1(struct file *file,
2566 struct snd_pcm_substream *substream,
2567 unsigned int cmd, void __user *arg)
2568 {
2569 if (snd_BUG_ON(!substream))
2570 return -ENXIO;
2571 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2572 return -EINVAL;
2573 switch (cmd) {
2574 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2575 {
2576 struct snd_xferi xferi;
2577 struct snd_xferi __user *_xferi = arg;
2578 struct snd_pcm_runtime *runtime = substream->runtime;
2579 snd_pcm_sframes_t result;
2580 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2581 return -EBADFD;
2582 if (put_user(0, &_xferi->result))
2583 return -EFAULT;
2584 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2585 return -EFAULT;
2586 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2587 __put_user(result, &_xferi->result);
2588 return result < 0 ? result : 0;
2589 }
2590 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2591 {
2592 struct snd_xfern xfern;
2593 struct snd_xfern __user *_xfern = arg;
2594 struct snd_pcm_runtime *runtime = substream->runtime;
2595 void __user **bufs;
2596 snd_pcm_sframes_t result;
2597 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2598 return -EBADFD;
2599 if (runtime->channels > 128)
2600 return -EINVAL;
2601 if (put_user(0, &_xfern->result))
2602 return -EFAULT;
2603 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2604 return -EFAULT;
2605 bufs = kmalloc(sizeof(void *) * runtime->channels, GFP_KERNEL);
2606 if (bufs == NULL)
2607 return -ENOMEM;
2608 if (copy_from_user(bufs, xfern.bufs, sizeof(void *) * runtime->channels)) {
2609 kfree(bufs);
2610 return -EFAULT;
2611 }
2612 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2613 kfree(bufs);
2614 __put_user(result, &_xfern->result);
2615 return result < 0 ? result : 0;
2616 }
2617 case SNDRV_PCM_IOCTL_REWIND:
2618 {
2619 snd_pcm_uframes_t frames;
2620 snd_pcm_uframes_t __user *_frames = arg;
2621 snd_pcm_sframes_t result;
2622 if (get_user(frames, _frames))
2623 return -EFAULT;
2624 if (put_user(0, _frames))
2625 return -EFAULT;
2626 result = snd_pcm_playback_rewind(substream, frames);
2627 __put_user(result, _frames);
2628 return result < 0 ? result : 0;
2629 }
2630 case SNDRV_PCM_IOCTL_FORWARD:
2631 {
2632 snd_pcm_uframes_t frames;
2633 snd_pcm_uframes_t __user *_frames = arg;
2634 snd_pcm_sframes_t result;
2635 if (get_user(frames, _frames))
2636 return -EFAULT;
2637 if (put_user(0, _frames))
2638 return -EFAULT;
2639 result = snd_pcm_playback_forward(substream, frames);
2640 __put_user(result, _frames);
2641 return result < 0 ? result : 0;
2642 }
2643 }
2644 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2645 }
2646
2647 static int snd_pcm_capture_ioctl1(struct file *file,
2648 struct snd_pcm_substream *substream,
2649 unsigned int cmd, void __user *arg)
2650 {
2651 if (snd_BUG_ON(!substream))
2652 return -ENXIO;
2653 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2654 return -EINVAL;
2655 switch (cmd) {
2656 case SNDRV_PCM_IOCTL_READI_FRAMES:
2657 {
2658 struct snd_xferi xferi;
2659 struct snd_xferi __user *_xferi = arg;
2660 struct snd_pcm_runtime *runtime = substream->runtime;
2661 snd_pcm_sframes_t result;
2662 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2663 return -EBADFD;
2664 if (put_user(0, &_xferi->result))
2665 return -EFAULT;
2666 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2667 return -EFAULT;
2668 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2669 __put_user(result, &_xferi->result);
2670 return result < 0 ? result : 0;
2671 }
2672 case SNDRV_PCM_IOCTL_READN_FRAMES:
2673 {
2674 struct snd_xfern xfern;
2675 struct snd_xfern __user *_xfern = arg;
2676 struct snd_pcm_runtime *runtime = substream->runtime;
2677 void *bufs;
2678 snd_pcm_sframes_t result;
2679 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2680 return -EBADFD;
2681 if (runtime->channels > 128)
2682 return -EINVAL;
2683 if (put_user(0, &_xfern->result))
2684 return -EFAULT;
2685 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2686 return -EFAULT;
2687 bufs = kmalloc(sizeof(void *) * runtime->channels, GFP_KERNEL);
2688 if (bufs == NULL)
2689 return -ENOMEM;
2690 if (copy_from_user(bufs, xfern.bufs, sizeof(void *) * runtime->channels)) {
2691 kfree(bufs);
2692 return -EFAULT;
2693 }
2694 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2695 kfree(bufs);
2696 __put_user(result, &_xfern->result);
2697 return result < 0 ? result : 0;
2698 }
2699 case SNDRV_PCM_IOCTL_REWIND:
2700 {
2701 snd_pcm_uframes_t frames;
2702 snd_pcm_uframes_t __user *_frames = arg;
2703 snd_pcm_sframes_t result;
2704 if (get_user(frames, _frames))
2705 return -EFAULT;
2706 if (put_user(0, _frames))
2707 return -EFAULT;
2708 result = snd_pcm_capture_rewind(substream, frames);
2709 __put_user(result, _frames);
2710 return result < 0 ? result : 0;
2711 }
2712 case SNDRV_PCM_IOCTL_FORWARD:
2713 {
2714 snd_pcm_uframes_t frames;
2715 snd_pcm_uframes_t __user *_frames = arg;
2716 snd_pcm_sframes_t result;
2717 if (get_user(frames, _frames))
2718 return -EFAULT;
2719 if (put_user(0, _frames))
2720 return -EFAULT;
2721 result = snd_pcm_capture_forward(substream, frames);
2722 __put_user(result, _frames);
2723 return result < 0 ? result : 0;
2724 }
2725 }
2726 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2727 }
2728
2729 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2730 unsigned long arg)
2731 {
2732 struct snd_pcm_file *pcm_file;
2733
2734 pcm_file = file->private_data;
2735
2736 if (((cmd >> 8) & 0xff) != 'A')
2737 return -ENOTTY;
2738
2739 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2740 (void __user *)arg);
2741 }
2742
2743 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2744 unsigned long arg)
2745 {
2746 struct snd_pcm_file *pcm_file;
2747
2748 pcm_file = file->private_data;
2749
2750 if (((cmd >> 8) & 0xff) != 'A')
2751 return -ENOTTY;
2752
2753 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2754 (void __user *)arg);
2755 }
2756
2757 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2758 unsigned int cmd, void *arg)
2759 {
2760 mm_segment_t fs;
2761 int result;
2762
2763 fs = snd_enter_user();
2764 switch (substream->stream) {
2765 case SNDRV_PCM_STREAM_PLAYBACK:
2766 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2767 (void __user *)arg);
2768 break;
2769 case SNDRV_PCM_STREAM_CAPTURE:
2770 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2771 (void __user *)arg);
2772 break;
2773 default:
2774 result = -EINVAL;
2775 break;
2776 }
2777 snd_leave_user(fs);
2778 return result;
2779 }
2780
2781 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2782
2783 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2784 loff_t * offset)
2785 {
2786 struct snd_pcm_file *pcm_file;
2787 struct snd_pcm_substream *substream;
2788 struct snd_pcm_runtime *runtime;
2789 snd_pcm_sframes_t result;
2790
2791 pcm_file = file->private_data;
2792 substream = pcm_file->substream;
2793 if (PCM_RUNTIME_CHECK(substream))
2794 return -ENXIO;
2795 runtime = substream->runtime;
2796 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2797 return -EBADFD;
2798 if (!frame_aligned(runtime, count))
2799 return -EINVAL;
2800 count = bytes_to_frames(runtime, count);
2801 result = snd_pcm_lib_read(substream, buf, count);
2802 if (result > 0)
2803 result = frames_to_bytes(runtime, result);
2804 return result;
2805 }
2806
2807 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2808 size_t count, loff_t * offset)
2809 {
2810 struct snd_pcm_file *pcm_file;
2811 struct snd_pcm_substream *substream;
2812 struct snd_pcm_runtime *runtime;
2813 snd_pcm_sframes_t result;
2814
2815 pcm_file = file->private_data;
2816 substream = pcm_file->substream;
2817 if (PCM_RUNTIME_CHECK(substream))
2818 return -ENXIO;
2819 runtime = substream->runtime;
2820 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2821 return -EBADFD;
2822 if (!frame_aligned(runtime, count))
2823 return -EINVAL;
2824 count = bytes_to_frames(runtime, count);
2825 result = snd_pcm_lib_write(substream, buf, count);
2826 if (result > 0)
2827 result = frames_to_bytes(runtime, result);
2828 return result;
2829 }
2830
2831 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2832 unsigned long nr_segs, loff_t pos)
2833
2834 {
2835 struct snd_pcm_file *pcm_file;
2836 struct snd_pcm_substream *substream;
2837 struct snd_pcm_runtime *runtime;
2838 snd_pcm_sframes_t result;
2839 unsigned long i;
2840 void __user **bufs;
2841 snd_pcm_uframes_t frames;
2842
2843 pcm_file = iocb->ki_filp->private_data;
2844 substream = pcm_file->substream;
2845 if (PCM_RUNTIME_CHECK(substream))
2846 return -ENXIO;
2847 runtime = substream->runtime;
2848 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2849 return -EBADFD;
2850 if (nr_segs > 1024 || nr_segs != runtime->channels)
2851 return -EINVAL;
2852 if (!frame_aligned(runtime, iov->iov_len))
2853 return -EINVAL;
2854 frames = bytes_to_samples(runtime, iov->iov_len);
2855 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2856 if (bufs == NULL)
2857 return -ENOMEM;
2858 for (i = 0; i < nr_segs; ++i)
2859 bufs[i] = iov[i].iov_base;
2860 result = snd_pcm_lib_readv(substream, bufs, frames);
2861 if (result > 0)
2862 result = frames_to_bytes(runtime, result);
2863 kfree(bufs);
2864 return result;
2865 }
2866
2867 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2868 unsigned long nr_segs, loff_t pos)
2869 {
2870 struct snd_pcm_file *pcm_file;
2871 struct snd_pcm_substream *substream;
2872 struct snd_pcm_runtime *runtime;
2873 snd_pcm_sframes_t result;
2874 unsigned long i;
2875 void __user **bufs;
2876 snd_pcm_uframes_t frames;
2877
2878 pcm_file = iocb->ki_filp->private_data;
2879 substream = pcm_file->substream;
2880 if (PCM_RUNTIME_CHECK(substream))
2881 return -ENXIO;
2882 runtime = substream->runtime;
2883 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2884 return -EBADFD;
2885 if (nr_segs > 128 || nr_segs != runtime->channels ||
2886 !frame_aligned(runtime, iov->iov_len))
2887 return -EINVAL;
2888 frames = bytes_to_samples(runtime, iov->iov_len);
2889 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2890 if (bufs == NULL)
2891 return -ENOMEM;
2892 for (i = 0; i < nr_segs; ++i)
2893 bufs[i] = iov[i].iov_base;
2894 result = snd_pcm_lib_writev(substream, bufs, frames);
2895 if (result > 0)
2896 result = frames_to_bytes(runtime, result);
2897 kfree(bufs);
2898 return result;
2899 }
2900
2901 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2902 {
2903 struct snd_pcm_file *pcm_file;
2904 struct snd_pcm_substream *substream;
2905 struct snd_pcm_runtime *runtime;
2906 unsigned int mask;
2907 snd_pcm_uframes_t avail;
2908
2909 pcm_file = file->private_data;
2910
2911 substream = pcm_file->substream;
2912 if (PCM_RUNTIME_CHECK(substream))
2913 return -ENXIO;
2914 runtime = substream->runtime;
2915
2916 poll_wait(file, &runtime->sleep, wait);
2917
2918 snd_pcm_stream_lock_irq(substream);
2919 avail = snd_pcm_playback_avail(runtime);
2920 switch (runtime->status->state) {
2921 case SNDRV_PCM_STATE_RUNNING:
2922 case SNDRV_PCM_STATE_PREPARED:
2923 case SNDRV_PCM_STATE_PAUSED:
2924 if (avail >= runtime->control->avail_min) {
2925 mask = POLLOUT | POLLWRNORM;
2926 break;
2927 }
2928 /* Fall through */
2929 case SNDRV_PCM_STATE_DRAINING:
2930 mask = 0;
2931 break;
2932 default:
2933 mask = POLLOUT | POLLWRNORM | POLLERR;
2934 break;
2935 }
2936 snd_pcm_stream_unlock_irq(substream);
2937 return mask;
2938 }
2939
2940 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2941 {
2942 struct snd_pcm_file *pcm_file;
2943 struct snd_pcm_substream *substream;
2944 struct snd_pcm_runtime *runtime;
2945 unsigned int mask;
2946 snd_pcm_uframes_t avail;
2947
2948 pcm_file = file->private_data;
2949
2950 substream = pcm_file->substream;
2951 if (PCM_RUNTIME_CHECK(substream))
2952 return -ENXIO;
2953 runtime = substream->runtime;
2954
2955 poll_wait(file, &runtime->sleep, wait);
2956
2957 snd_pcm_stream_lock_irq(substream);
2958 avail = snd_pcm_capture_avail(runtime);
2959 switch (runtime->status->state) {
2960 case SNDRV_PCM_STATE_RUNNING:
2961 case SNDRV_PCM_STATE_PREPARED:
2962 case SNDRV_PCM_STATE_PAUSED:
2963 if (avail >= runtime->control->avail_min) {
2964 mask = POLLIN | POLLRDNORM;
2965 break;
2966 }
2967 mask = 0;
2968 break;
2969 case SNDRV_PCM_STATE_DRAINING:
2970 if (avail > 0) {
2971 mask = POLLIN | POLLRDNORM;
2972 break;
2973 }
2974 /* Fall through */
2975 default:
2976 mask = POLLIN | POLLRDNORM | POLLERR;
2977 break;
2978 }
2979 snd_pcm_stream_unlock_irq(substream);
2980 return mask;
2981 }
2982
2983 /*
2984 * mmap support
2985 */
2986
2987 /*
2988 * Only on coherent architectures, we can mmap the status and the control records
2989 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
2990 */
2991 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
2992 /*
2993 * mmap status record
2994 */
2995 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
2996 struct vm_fault *vmf)
2997 {
2998 struct snd_pcm_substream *substream = area->vm_private_data;
2999 struct snd_pcm_runtime *runtime;
3000
3001 if (substream == NULL)
3002 return VM_FAULT_SIGBUS;
3003 runtime = substream->runtime;
3004 vmf->page = virt_to_page(runtime->status);
3005 get_page(vmf->page);
3006 return 0;
3007 }
3008
3009 static struct vm_operations_struct snd_pcm_vm_ops_status =
3010 {
3011 .fault = snd_pcm_mmap_status_fault,
3012 };
3013
3014 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3015 struct vm_area_struct *area)
3016 {
3017 struct snd_pcm_runtime *runtime;
3018 long size;
3019 if (!(area->vm_flags & VM_READ))
3020 return -EINVAL;
3021 runtime = substream->runtime;
3022 size = area->vm_end - area->vm_start;
3023 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3024 return -EINVAL;
3025 area->vm_ops = &snd_pcm_vm_ops_status;
3026 area->vm_private_data = substream;
3027 area->vm_flags |= VM_RESERVED;
3028 return 0;
3029 }
3030
3031 /*
3032 * mmap control record
3033 */
3034 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3035 struct vm_fault *vmf)
3036 {
3037 struct snd_pcm_substream *substream = area->vm_private_data;
3038 struct snd_pcm_runtime *runtime;
3039
3040 if (substream == NULL)
3041 return VM_FAULT_SIGBUS;
3042 runtime = substream->runtime;
3043 vmf->page = virt_to_page(runtime->control);
3044 get_page(vmf->page);
3045 return 0;
3046 }
3047
3048 static struct vm_operations_struct snd_pcm_vm_ops_control =
3049 {
3050 .fault = snd_pcm_mmap_control_fault,
3051 };
3052
3053 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3054 struct vm_area_struct *area)
3055 {
3056 struct snd_pcm_runtime *runtime;
3057 long size;
3058 if (!(area->vm_flags & VM_READ))
3059 return -EINVAL;
3060 runtime = substream->runtime;
3061 size = area->vm_end - area->vm_start;
3062 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3063 return -EINVAL;
3064 area->vm_ops = &snd_pcm_vm_ops_control;
3065 area->vm_private_data = substream;
3066 area->vm_flags |= VM_RESERVED;
3067 return 0;
3068 }
3069 #else /* ! coherent mmap */
3070 /*
3071 * don't support mmap for status and control records.
3072 */
3073 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3074 struct vm_area_struct *area)
3075 {
3076 return -ENXIO;
3077 }
3078 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3079 struct vm_area_struct *area)
3080 {
3081 return -ENXIO;
3082 }
3083 #endif /* coherent mmap */
3084
3085 /*
3086 * fault callback for mmapping a RAM page
3087 */
3088 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3089 struct vm_fault *vmf)
3090 {
3091 struct snd_pcm_substream *substream = area->vm_private_data;
3092 struct snd_pcm_runtime *runtime;
3093 unsigned long offset;
3094 struct page * page;
3095 void *vaddr;
3096 size_t dma_bytes;
3097
3098 if (substream == NULL)
3099 return VM_FAULT_SIGBUS;
3100 runtime = substream->runtime;
3101 offset = vmf->pgoff << PAGE_SHIFT;
3102 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3103 if (offset > dma_bytes - PAGE_SIZE)
3104 return VM_FAULT_SIGBUS;
3105 if (substream->ops->page) {
3106 page = substream->ops->page(substream, offset);
3107 if (!page)
3108 return VM_FAULT_SIGBUS;
3109 } else {
3110 vaddr = runtime->dma_area + offset;
3111 page = virt_to_page(vaddr);
3112 }
3113 get_page(page);
3114 vmf->page = page;
3115 return 0;
3116 }
3117
3118 static struct vm_operations_struct snd_pcm_vm_ops_data =
3119 {
3120 .open = snd_pcm_mmap_data_open,
3121 .close = snd_pcm_mmap_data_close,
3122 .fault = snd_pcm_mmap_data_fault,
3123 };
3124
3125 /*
3126 * mmap the DMA buffer on RAM
3127 */
3128 static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
3129 struct vm_area_struct *area)
3130 {
3131 area->vm_ops = &snd_pcm_vm_ops_data;
3132 area->vm_private_data = substream;
3133 area->vm_flags |= VM_RESERVED;
3134 atomic_inc(&substream->mmap_count);
3135 return 0;
3136 }
3137
3138 /*
3139 * mmap the DMA buffer on I/O memory area
3140 */
3141 #if SNDRV_PCM_INFO_MMAP_IOMEM
3142 static struct vm_operations_struct snd_pcm_vm_ops_data_mmio =
3143 {
3144 .open = snd_pcm_mmap_data_open,
3145 .close = snd_pcm_mmap_data_close,
3146 };
3147
3148 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3149 struct vm_area_struct *area)
3150 {
3151 long size;
3152 unsigned long offset;
3153
3154 #ifdef pgprot_noncached
3155 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3156 #endif
3157 area->vm_ops = &snd_pcm_vm_ops_data_mmio;
3158 area->vm_private_data = substream;
3159 area->vm_flags |= VM_IO;
3160 size = area->vm_end - area->vm_start;
3161 offset = area->vm_pgoff << PAGE_SHIFT;
3162 if (io_remap_pfn_range(area, area->vm_start,
3163 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
3164 size, area->vm_page_prot))
3165 return -EAGAIN;
3166 atomic_inc(&substream->mmap_count);
3167 return 0;
3168 }
3169
3170 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3171 #endif /* SNDRV_PCM_INFO_MMAP */
3172
3173 /*
3174 * mmap DMA buffer
3175 */
3176 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3177 struct vm_area_struct *area)
3178 {
3179 struct snd_pcm_runtime *runtime;
3180 long size;
3181 unsigned long offset;
3182 size_t dma_bytes;
3183
3184 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3185 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3186 return -EINVAL;
3187 } else {
3188 if (!(area->vm_flags & VM_READ))
3189 return -EINVAL;
3190 }
3191 runtime = substream->runtime;
3192 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3193 return -EBADFD;
3194 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3195 return -ENXIO;
3196 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3197 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3198 return -EINVAL;
3199 size = area->vm_end - area->vm_start;
3200 offset = area->vm_pgoff << PAGE_SHIFT;
3201 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3202 if ((size_t)size > dma_bytes)
3203 return -EINVAL;
3204 if (offset > dma_bytes - size)
3205 return -EINVAL;
3206
3207 if (substream->ops->mmap)
3208 return substream->ops->mmap(substream, area);
3209 else
3210 return snd_pcm_default_mmap(substream, area);
3211 }
3212
3213 EXPORT_SYMBOL(snd_pcm_mmap_data);
3214
3215 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3216 {
3217 struct snd_pcm_file * pcm_file;
3218 struct snd_pcm_substream *substream;
3219 unsigned long offset;
3220
3221 pcm_file = file->private_data;
3222 substream = pcm_file->substream;
3223 if (PCM_RUNTIME_CHECK(substream))
3224 return -ENXIO;
3225
3226 offset = area->vm_pgoff << PAGE_SHIFT;
3227 switch (offset) {
3228 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3229 if (pcm_file->no_compat_mmap)
3230 return -ENXIO;
3231 return snd_pcm_mmap_status(substream, file, area);
3232 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3233 if (pcm_file->no_compat_mmap)
3234 return -ENXIO;
3235 return snd_pcm_mmap_control(substream, file, area);
3236 default:
3237 return snd_pcm_mmap_data(substream, file, area);
3238 }
3239 return 0;
3240 }
3241
3242 static int snd_pcm_fasync(int fd, struct file * file, int on)
3243 {
3244 struct snd_pcm_file * pcm_file;
3245 struct snd_pcm_substream *substream;
3246 struct snd_pcm_runtime *runtime;
3247 int err = -ENXIO;
3248
3249 lock_kernel();
3250 pcm_file = file->private_data;
3251 substream = pcm_file->substream;
3252 if (PCM_RUNTIME_CHECK(substream))
3253 goto out;
3254 runtime = substream->runtime;
3255 err = fasync_helper(fd, file, on, &runtime->fasync);
3256 out:
3257 unlock_kernel();
3258 if (err < 0)
3259 return err;
3260 return 0;
3261 }
3262
3263 /*
3264 * ioctl32 compat
3265 */
3266 #ifdef CONFIG_COMPAT
3267 #include "pcm_compat.c"
3268 #else
3269 #define snd_pcm_ioctl_compat NULL
3270 #endif
3271
3272 /*
3273 * To be removed helpers to keep binary compatibility
3274 */
3275
3276 #ifdef CONFIG_SND_SUPPORT_OLD_API
3277 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3278 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3279
3280 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3281 struct snd_pcm_hw_params_old *oparams)
3282 {
3283 unsigned int i;
3284
3285 memset(params, 0, sizeof(*params));
3286 params->flags = oparams->flags;
3287 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3288 params->masks[i].bits[0] = oparams->masks[i];
3289 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3290 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3291 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3292 params->info = oparams->info;
3293 params->msbits = oparams->msbits;
3294 params->rate_num = oparams->rate_num;
3295 params->rate_den = oparams->rate_den;
3296 params->fifo_size = oparams->fifo_size;
3297 }
3298
3299 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3300 struct snd_pcm_hw_params *params)
3301 {
3302 unsigned int i;
3303
3304 memset(oparams, 0, sizeof(*oparams));
3305 oparams->flags = params->flags;
3306 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3307 oparams->masks[i] = params->masks[i].bits[0];
3308 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3309 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3310 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3311 oparams->info = params->info;
3312 oparams->msbits = params->msbits;
3313 oparams->rate_num = params->rate_num;
3314 oparams->rate_den = params->rate_den;
3315 oparams->fifo_size = params->fifo_size;
3316 }
3317
3318 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3319 struct snd_pcm_hw_params_old __user * _oparams)
3320 {
3321 struct snd_pcm_hw_params *params;
3322 struct snd_pcm_hw_params_old *oparams = NULL;
3323 int err;
3324
3325 params = kmalloc(sizeof(*params), GFP_KERNEL);
3326 if (!params) {
3327 err = -ENOMEM;
3328 goto out;
3329 }
3330 oparams = kmalloc(sizeof(*oparams), GFP_KERNEL);
3331 if (!oparams) {
3332 err = -ENOMEM;
3333 goto out;
3334 }
3335
3336 if (copy_from_user(oparams, _oparams, sizeof(*oparams))) {
3337 err = -EFAULT;
3338 goto out;
3339 }
3340 snd_pcm_hw_convert_from_old_params(params, oparams);
3341 err = snd_pcm_hw_refine(substream, params);
3342 snd_pcm_hw_convert_to_old_params(oparams, params);
3343 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3344 if (!err)
3345 err = -EFAULT;
3346 }
3347 out:
3348 kfree(params);
3349 kfree(oparams);
3350 return err;
3351 }
3352
3353 static int snd_pcm_hw_params_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 if (copy_from_user(oparams, _oparams, sizeof(*oparams))) {
3371 err = -EFAULT;
3372 goto out;
3373 }
3374 snd_pcm_hw_convert_from_old_params(params, oparams);
3375 err = snd_pcm_hw_params(substream, params);
3376 snd_pcm_hw_convert_to_old_params(oparams, params);
3377 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3378 if (!err)
3379 err = -EFAULT;
3380 }
3381 out:
3382 kfree(params);
3383 kfree(oparams);
3384 return err;
3385 }
3386 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3387
3388 /*
3389 * Register section
3390 */
3391
3392 const struct file_operations snd_pcm_f_ops[2] = {
3393 {
3394 .owner = THIS_MODULE,
3395 .write = snd_pcm_write,
3396 .aio_write = snd_pcm_aio_write,
3397 .open = snd_pcm_playback_open,
3398 .release = snd_pcm_release,
3399 .poll = snd_pcm_playback_poll,
3400 .unlocked_ioctl = snd_pcm_playback_ioctl,
3401 .compat_ioctl = snd_pcm_ioctl_compat,
3402 .mmap = snd_pcm_mmap,
3403 .fasync = snd_pcm_fasync,
3404 },
3405 {
3406 .owner = THIS_MODULE,
3407 .read = snd_pcm_read,
3408 .aio_read = snd_pcm_aio_read,
3409 .open = snd_pcm_capture_open,
3410 .release = snd_pcm_release,
3411 .poll = snd_pcm_capture_poll,
3412 .unlocked_ioctl = snd_pcm_capture_ioctl,
3413 .compat_ioctl = snd_pcm_ioctl_compat,
3414 .mmap = snd_pcm_mmap,
3415 .fasync = snd_pcm_fasync,
3416 }
3417 };
x86 "subsystem" repository