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Linux 2.6.30-rc4
[linux-2.6/mini2440.git] / sound / core / pcm_native.c
blobfc6f98e257df5e27d67a71a092eaa85fd6765ca1
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(KERN_DEBUG "%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(KERN_DEBUG "%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(KERN_DEBUG "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 = memdup_user(_params, sizeof(*params));
331 if (IS_ERR(params))
332 return PTR_ERR(params);
333
334 err = snd_pcm_hw_refine(substream, params);
335 if (copy_to_user(_params, params, sizeof(*params))) {
336 if (!err)
337 err = -EFAULT;
338 }
339
340 kfree(params);
341 return err;
342 }
343
344 static int period_to_usecs(struct snd_pcm_runtime *runtime)
345 {
346 int usecs;
347
348 if (! runtime->rate)
349 return -1; /* invalid */
350
351 /* take 75% of period time as the deadline */
352 usecs = (750000 / runtime->rate) * runtime->period_size;
353 usecs += ((750000 % runtime->rate) * runtime->period_size) /
354 runtime->rate;
355
356 return usecs;
357 }
358
359 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
360 struct snd_pcm_hw_params *params)
361 {
362 struct snd_pcm_runtime *runtime;
363 int err, usecs;
364 unsigned int bits;
365 snd_pcm_uframes_t frames;
366
367 if (PCM_RUNTIME_CHECK(substream))
368 return -ENXIO;
369 runtime = substream->runtime;
370 snd_pcm_stream_lock_irq(substream);
371 switch (runtime->status->state) {
372 case SNDRV_PCM_STATE_OPEN:
373 case SNDRV_PCM_STATE_SETUP:
374 case SNDRV_PCM_STATE_PREPARED:
375 break;
376 default:
377 snd_pcm_stream_unlock_irq(substream);
378 return -EBADFD;
379 }
380 snd_pcm_stream_unlock_irq(substream);
381 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
382 if (!substream->oss.oss)
383 #endif
384 if (atomic_read(&substream->mmap_count))
385 return -EBADFD;
386
387 params->rmask = ~0U;
388 err = snd_pcm_hw_refine(substream, params);
389 if (err < 0)
390 goto _error;
391
392 err = snd_pcm_hw_params_choose(substream, params);
393 if (err < 0)
394 goto _error;
395
396 if (substream->ops->hw_params != NULL) {
397 err = substream->ops->hw_params(substream, params);
398 if (err < 0)
399 goto _error;
400 }
401
402 runtime->access = params_access(params);
403 runtime->format = params_format(params);
404 runtime->subformat = params_subformat(params);
405 runtime->channels = params_channels(params);
406 runtime->rate = params_rate(params);
407 runtime->period_size = params_period_size(params);
408 runtime->periods = params_periods(params);
409 runtime->buffer_size = params_buffer_size(params);
410 runtime->info = params->info;
411 runtime->rate_num = params->rate_num;
412 runtime->rate_den = params->rate_den;
413
414 bits = snd_pcm_format_physical_width(runtime->format);
415 runtime->sample_bits = bits;
416 bits *= runtime->channels;
417 runtime->frame_bits = bits;
418 frames = 1;
419 while (bits % 8 != 0) {
420 bits *= 2;
421 frames *= 2;
422 }
423 runtime->byte_align = bits / 8;
424 runtime->min_align = frames;
425
426 /* Default sw params */
427 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
428 runtime->period_step = 1;
429 runtime->control->avail_min = runtime->period_size;
430 runtime->start_threshold = 1;
431 runtime->stop_threshold = runtime->buffer_size;
432 runtime->silence_threshold = 0;
433 runtime->silence_size = 0;
434 runtime->boundary = runtime->buffer_size;
435 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
436 runtime->boundary *= 2;
437
438 snd_pcm_timer_resolution_change(substream);
439 runtime->status->state = SNDRV_PCM_STATE_SETUP;
440
441 pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY,
442 substream->latency_id);
443 if ((usecs = period_to_usecs(runtime)) >= 0)
444 pm_qos_add_requirement(PM_QOS_CPU_DMA_LATENCY,
445 substream->latency_id, usecs);
446 return 0;
447 _error:
448 /* hardware might be unuseable from this time,
449 so we force application to retry to set
450 the correct hardware parameter settings */
451 runtime->status->state = SNDRV_PCM_STATE_OPEN;
452 if (substream->ops->hw_free != NULL)
453 substream->ops->hw_free(substream);
454 return err;
455 }
456
457 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
458 struct snd_pcm_hw_params __user * _params)
459 {
460 struct snd_pcm_hw_params *params;
461 int err;
462
463 params = memdup_user(_params, sizeof(*params));
464 if (IS_ERR(params))
465 return PTR_ERR(params);
466
467 err = snd_pcm_hw_params(substream, params);
468 if (copy_to_user(_params, params, sizeof(*params))) {
469 if (!err)
470 err = -EFAULT;
471 }
472
473 kfree(params);
474 return err;
475 }
476
477 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
478 {
479 struct snd_pcm_runtime *runtime;
480 int result = 0;
481
482 if (PCM_RUNTIME_CHECK(substream))
483 return -ENXIO;
484 runtime = substream->runtime;
485 snd_pcm_stream_lock_irq(substream);
486 switch (runtime->status->state) {
487 case SNDRV_PCM_STATE_SETUP:
488 case SNDRV_PCM_STATE_PREPARED:
489 break;
490 default:
491 snd_pcm_stream_unlock_irq(substream);
492 return -EBADFD;
493 }
494 snd_pcm_stream_unlock_irq(substream);
495 if (atomic_read(&substream->mmap_count))
496 return -EBADFD;
497 if (substream->ops->hw_free)
498 result = substream->ops->hw_free(substream);
499 runtime->status->state = SNDRV_PCM_STATE_OPEN;
500 pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY,
501 substream->latency_id);
502 return result;
503 }
504
505 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
506 struct snd_pcm_sw_params *params)
507 {
508 struct snd_pcm_runtime *runtime;
509
510 if (PCM_RUNTIME_CHECK(substream))
511 return -ENXIO;
512 runtime = substream->runtime;
513 snd_pcm_stream_lock_irq(substream);
514 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
515 snd_pcm_stream_unlock_irq(substream);
516 return -EBADFD;
517 }
518 snd_pcm_stream_unlock_irq(substream);
519
520 if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
521 return -EINVAL;
522 if (params->avail_min == 0)
523 return -EINVAL;
524 if (params->silence_size >= runtime->boundary) {
525 if (params->silence_threshold != 0)
526 return -EINVAL;
527 } else {
528 if (params->silence_size > params->silence_threshold)
529 return -EINVAL;
530 if (params->silence_threshold > runtime->buffer_size)
531 return -EINVAL;
532 }
533 snd_pcm_stream_lock_irq(substream);
534 runtime->tstamp_mode = params->tstamp_mode;
535 runtime->period_step = params->period_step;
536 runtime->control->avail_min = params->avail_min;
537 runtime->start_threshold = params->start_threshold;
538 runtime->stop_threshold = params->stop_threshold;
539 runtime->silence_threshold = params->silence_threshold;
540 runtime->silence_size = params->silence_size;
541 params->boundary = runtime->boundary;
542 if (snd_pcm_running(substream)) {
543 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
544 runtime->silence_size > 0)
545 snd_pcm_playback_silence(substream, ULONG_MAX);
546 wake_up(&runtime->sleep);
547 }
548 snd_pcm_stream_unlock_irq(substream);
549 return 0;
550 }
551
552 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
553 struct snd_pcm_sw_params __user * _params)
554 {
555 struct snd_pcm_sw_params params;
556 int err;
557 if (copy_from_user(&params, _params, sizeof(params)))
558 return -EFAULT;
559 err = snd_pcm_sw_params(substream, &params);
560 if (copy_to_user(_params, &params, sizeof(params)))
561 return -EFAULT;
562 return err;
563 }
564
565 int snd_pcm_status(struct snd_pcm_substream *substream,
566 struct snd_pcm_status *status)
567 {
568 struct snd_pcm_runtime *runtime = substream->runtime;
569
570 snd_pcm_stream_lock_irq(substream);
571 status->state = runtime->status->state;
572 status->suspended_state = runtime->status->suspended_state;
573 if (status->state == SNDRV_PCM_STATE_OPEN)
574 goto _end;
575 status->trigger_tstamp = runtime->trigger_tstamp;
576 if (snd_pcm_running(substream)) {
577 snd_pcm_update_hw_ptr(substream);
578 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
579 status->tstamp = runtime->status->tstamp;
580 goto _tstamp_end;
581 }
582 }
583 snd_pcm_gettime(runtime, &status->tstamp);
584 _tstamp_end:
585 status->appl_ptr = runtime->control->appl_ptr;
586 status->hw_ptr = runtime->status->hw_ptr;
587 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
588 status->avail = snd_pcm_playback_avail(runtime);
589 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
590 runtime->status->state == SNDRV_PCM_STATE_DRAINING)
591 status->delay = runtime->buffer_size - status->avail;
592 else
593 status->delay = 0;
594 } else {
595 status->avail = snd_pcm_capture_avail(runtime);
596 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
597 status->delay = status->avail;
598 else
599 status->delay = 0;
600 }
601 status->avail_max = runtime->avail_max;
602 status->overrange = runtime->overrange;
603 runtime->avail_max = 0;
604 runtime->overrange = 0;
605 _end:
606 snd_pcm_stream_unlock_irq(substream);
607 return 0;
608 }
609
610 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
611 struct snd_pcm_status __user * _status)
612 {
613 struct snd_pcm_status status;
614 int res;
615
616 memset(&status, 0, sizeof(status));
617 res = snd_pcm_status(substream, &status);
618 if (res < 0)
619 return res;
620 if (copy_to_user(_status, &status, sizeof(status)))
621 return -EFAULT;
622 return 0;
623 }
624
625 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
626 struct snd_pcm_channel_info * info)
627 {
628 struct snd_pcm_runtime *runtime;
629 unsigned int channel;
630
631 channel = info->channel;
632 runtime = substream->runtime;
633 snd_pcm_stream_lock_irq(substream);
634 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
635 snd_pcm_stream_unlock_irq(substream);
636 return -EBADFD;
637 }
638 snd_pcm_stream_unlock_irq(substream);
639 if (channel >= runtime->channels)
640 return -EINVAL;
641 memset(info, 0, sizeof(*info));
642 info->channel = channel;
643 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
644 }
645
646 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
647 struct snd_pcm_channel_info __user * _info)
648 {
649 struct snd_pcm_channel_info info;
650 int res;
651
652 if (copy_from_user(&info, _info, sizeof(info)))
653 return -EFAULT;
654 res = snd_pcm_channel_info(substream, &info);
655 if (res < 0)
656 return res;
657 if (copy_to_user(_info, &info, sizeof(info)))
658 return -EFAULT;
659 return 0;
660 }
661
662 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
663 {
664 struct snd_pcm_runtime *runtime = substream->runtime;
665 if (runtime->trigger_master == NULL)
666 return;
667 if (runtime->trigger_master == substream) {
668 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
669 } else {
670 snd_pcm_trigger_tstamp(runtime->trigger_master);
671 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
672 }
673 runtime->trigger_master = NULL;
674 }
675
676 struct action_ops {
677 int (*pre_action)(struct snd_pcm_substream *substream, int state);
678 int (*do_action)(struct snd_pcm_substream *substream, int state);
679 void (*undo_action)(struct snd_pcm_substream *substream, int state);
680 void (*post_action)(struct snd_pcm_substream *substream, int state);
681 };
682
683 /*
684 * this functions is core for handling of linked stream
685 * Note: the stream state might be changed also on failure
686 * Note2: call with calling stream lock + link lock
687 */
688 static int snd_pcm_action_group(struct action_ops *ops,
689 struct snd_pcm_substream *substream,
690 int state, int do_lock)
691 {
692 struct snd_pcm_substream *s = NULL;
693 struct snd_pcm_substream *s1;
694 int res = 0;
695
696 snd_pcm_group_for_each_entry(s, substream) {
697 if (do_lock && s != substream)
698 spin_lock_nested(&s->self_group.lock,
699 SINGLE_DEPTH_NESTING);
700 res = ops->pre_action(s, state);
701 if (res < 0)
702 goto _unlock;
703 }
704 snd_pcm_group_for_each_entry(s, substream) {
705 res = ops->do_action(s, state);
706 if (res < 0) {
707 if (ops->undo_action) {
708 snd_pcm_group_for_each_entry(s1, substream) {
709 if (s1 == s) /* failed stream */
710 break;
711 ops->undo_action(s1, state);
712 }
713 }
714 s = NULL; /* unlock all */
715 goto _unlock;
716 }
717 }
718 snd_pcm_group_for_each_entry(s, substream) {
719 ops->post_action(s, state);
720 }
721 _unlock:
722 if (do_lock) {
723 /* unlock streams */
724 snd_pcm_group_for_each_entry(s1, substream) {
725 if (s1 != substream)
726 spin_unlock(&s1->self_group.lock);
727 if (s1 == s) /* end */
728 break;
729 }
730 }
731 return res;
732 }
733
734 /*
735 * Note: call with stream lock
736 */
737 static int snd_pcm_action_single(struct action_ops *ops,
738 struct snd_pcm_substream *substream,
739 int state)
740 {
741 int res;
742
743 res = ops->pre_action(substream, state);
744 if (res < 0)
745 return res;
746 res = ops->do_action(substream, state);
747 if (res == 0)
748 ops->post_action(substream, state);
749 else if (ops->undo_action)
750 ops->undo_action(substream, state);
751 return res;
752 }
753
754 /*
755 * Note: call with stream lock
756 */
757 static int snd_pcm_action(struct action_ops *ops,
758 struct snd_pcm_substream *substream,
759 int state)
760 {
761 int res;
762
763 if (snd_pcm_stream_linked(substream)) {
764 if (!spin_trylock(&substream->group->lock)) {
765 spin_unlock(&substream->self_group.lock);
766 spin_lock(&substream->group->lock);
767 spin_lock(&substream->self_group.lock);
768 }
769 res = snd_pcm_action_group(ops, substream, state, 1);
770 spin_unlock(&substream->group->lock);
771 } else {
772 res = snd_pcm_action_single(ops, substream, state);
773 }
774 return res;
775 }
776
777 /*
778 * Note: don't use any locks before
779 */
780 static int snd_pcm_action_lock_irq(struct action_ops *ops,
781 struct snd_pcm_substream *substream,
782 int state)
783 {
784 int res;
785
786 read_lock_irq(&snd_pcm_link_rwlock);
787 if (snd_pcm_stream_linked(substream)) {
788 spin_lock(&substream->group->lock);
789 spin_lock(&substream->self_group.lock);
790 res = snd_pcm_action_group(ops, substream, state, 1);
791 spin_unlock(&substream->self_group.lock);
792 spin_unlock(&substream->group->lock);
793 } else {
794 spin_lock(&substream->self_group.lock);
795 res = snd_pcm_action_single(ops, substream, state);
796 spin_unlock(&substream->self_group.lock);
797 }
798 read_unlock_irq(&snd_pcm_link_rwlock);
799 return res;
800 }
801
802 /*
803 */
804 static int snd_pcm_action_nonatomic(struct action_ops *ops,
805 struct snd_pcm_substream *substream,
806 int state)
807 {
808 int res;
809
810 down_read(&snd_pcm_link_rwsem);
811 if (snd_pcm_stream_linked(substream))
812 res = snd_pcm_action_group(ops, substream, state, 0);
813 else
814 res = snd_pcm_action_single(ops, substream, state);
815 up_read(&snd_pcm_link_rwsem);
816 return res;
817 }
818
819 /*
820 * start callbacks
821 */
822 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
823 {
824 struct snd_pcm_runtime *runtime = substream->runtime;
825 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
826 return -EBADFD;
827 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
828 !snd_pcm_playback_data(substream))
829 return -EPIPE;
830 runtime->trigger_master = substream;
831 return 0;
832 }
833
834 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
835 {
836 if (substream->runtime->trigger_master != substream)
837 return 0;
838 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
839 }
840
841 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
842 {
843 if (substream->runtime->trigger_master == substream)
844 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
845 }
846
847 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
848 {
849 struct snd_pcm_runtime *runtime = substream->runtime;
850 snd_pcm_trigger_tstamp(substream);
851 runtime->status->state = state;
852 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
853 runtime->silence_size > 0)
854 snd_pcm_playback_silence(substream, ULONG_MAX);
855 if (substream->timer)
856 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
857 &runtime->trigger_tstamp);
858 }
859
860 static struct action_ops snd_pcm_action_start = {
861 .pre_action = snd_pcm_pre_start,
862 .do_action = snd_pcm_do_start,
863 .undo_action = snd_pcm_undo_start,
864 .post_action = snd_pcm_post_start
865 };
866
867 /**
868 * snd_pcm_start - start all linked streams
869 * @substream: the PCM substream instance
870 */
871 int snd_pcm_start(struct snd_pcm_substream *substream)
872 {
873 return snd_pcm_action(&snd_pcm_action_start, substream,
874 SNDRV_PCM_STATE_RUNNING);
875 }
876
877 /*
878 * stop callbacks
879 */
880 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
881 {
882 struct snd_pcm_runtime *runtime = substream->runtime;
883 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
884 return -EBADFD;
885 runtime->trigger_master = substream;
886 return 0;
887 }
888
889 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
890 {
891 if (substream->runtime->trigger_master == substream &&
892 snd_pcm_running(substream))
893 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
894 return 0; /* unconditonally stop all substreams */
895 }
896
897 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
898 {
899 struct snd_pcm_runtime *runtime = substream->runtime;
900 if (runtime->status->state != state) {
901 snd_pcm_trigger_tstamp(substream);
902 if (substream->timer)
903 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
904 &runtime->trigger_tstamp);
905 runtime->status->state = state;
906 }
907 wake_up(&runtime->sleep);
908 }
909
910 static struct action_ops snd_pcm_action_stop = {
911 .pre_action = snd_pcm_pre_stop,
912 .do_action = snd_pcm_do_stop,
913 .post_action = snd_pcm_post_stop
914 };
915
916 /**
917 * snd_pcm_stop - try to stop all running streams in the substream group
918 * @substream: the PCM substream instance
919 * @state: PCM state after stopping the stream
920 *
921 * The state of each stream is then changed to the given state unconditionally.
922 */
923 int snd_pcm_stop(struct snd_pcm_substream *substream, int state)
924 {
925 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
926 }
927
928 EXPORT_SYMBOL(snd_pcm_stop);
929
930 /**
931 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
932 * @substream: the PCM substream
933 *
934 * After stopping, the state is changed to SETUP.
935 * Unlike snd_pcm_stop(), this affects only the given stream.
936 */
937 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
938 {
939 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
940 SNDRV_PCM_STATE_SETUP);
941 }
942
943 /*
944 * pause callbacks
945 */
946 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
947 {
948 struct snd_pcm_runtime *runtime = substream->runtime;
949 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
950 return -ENOSYS;
951 if (push) {
952 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
953 return -EBADFD;
954 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
955 return -EBADFD;
956 runtime->trigger_master = substream;
957 return 0;
958 }
959
960 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
961 {
962 if (substream->runtime->trigger_master != substream)
963 return 0;
964 return substream->ops->trigger(substream,
965 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
966 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
967 }
968
969 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
970 {
971 if (substream->runtime->trigger_master == substream)
972 substream->ops->trigger(substream,
973 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
974 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
975 }
976
977 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
978 {
979 struct snd_pcm_runtime *runtime = substream->runtime;
980 snd_pcm_trigger_tstamp(substream);
981 if (push) {
982 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
983 if (substream->timer)
984 snd_timer_notify(substream->timer,
985 SNDRV_TIMER_EVENT_MPAUSE,
986 &runtime->trigger_tstamp);
987 wake_up(&runtime->sleep);
988 } else {
989 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
990 if (substream->timer)
991 snd_timer_notify(substream->timer,
992 SNDRV_TIMER_EVENT_MCONTINUE,
993 &runtime->trigger_tstamp);
994 }
995 }
996
997 static struct action_ops snd_pcm_action_pause = {
998 .pre_action = snd_pcm_pre_pause,
999 .do_action = snd_pcm_do_pause,
1000 .undo_action = snd_pcm_undo_pause,
1001 .post_action = snd_pcm_post_pause
1002 };
1003
1004 /*
1005 * Push/release the pause for all linked streams.
1006 */
1007 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1008 {
1009 return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1010 }
1011
1012 #ifdef CONFIG_PM
1013 /* suspend */
1014
1015 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1016 {
1017 struct snd_pcm_runtime *runtime = substream->runtime;
1018 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1019 return -EBUSY;
1020 runtime->trigger_master = substream;
1021 return 0;
1022 }
1023
1024 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1025 {
1026 struct snd_pcm_runtime *runtime = substream->runtime;
1027 if (runtime->trigger_master != substream)
1028 return 0;
1029 if (! snd_pcm_running(substream))
1030 return 0;
1031 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1032 return 0; /* suspend unconditionally */
1033 }
1034
1035 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1036 {
1037 struct snd_pcm_runtime *runtime = substream->runtime;
1038 snd_pcm_trigger_tstamp(substream);
1039 if (substream->timer)
1040 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1041 &runtime->trigger_tstamp);
1042 runtime->status->suspended_state = runtime->status->state;
1043 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1044 wake_up(&runtime->sleep);
1045 }
1046
1047 static struct action_ops snd_pcm_action_suspend = {
1048 .pre_action = snd_pcm_pre_suspend,
1049 .do_action = snd_pcm_do_suspend,
1050 .post_action = snd_pcm_post_suspend
1051 };
1052
1053 /**
1054 * snd_pcm_suspend - trigger SUSPEND to all linked streams
1055 * @substream: the PCM substream
1056 *
1057 * After this call, all streams are changed to SUSPENDED state.
1058 */
1059 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1060 {
1061 int err;
1062 unsigned long flags;
1063
1064 if (! substream)
1065 return 0;
1066
1067 snd_pcm_stream_lock_irqsave(substream, flags);
1068 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1069 snd_pcm_stream_unlock_irqrestore(substream, flags);
1070 return err;
1071 }
1072
1073 EXPORT_SYMBOL(snd_pcm_suspend);
1074
1075 /**
1076 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1077 * @pcm: the PCM instance
1078 *
1079 * After this call, all streams are changed to SUSPENDED state.
1080 */
1081 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1082 {
1083 struct snd_pcm_substream *substream;
1084 int stream, err = 0;
1085
1086 if (! pcm)
1087 return 0;
1088
1089 for (stream = 0; stream < 2; stream++) {
1090 for (substream = pcm->streams[stream].substream;
1091 substream; substream = substream->next) {
1092 /* FIXME: the open/close code should lock this as well */
1093 if (substream->runtime == NULL)
1094 continue;
1095 err = snd_pcm_suspend(substream);
1096 if (err < 0 && err != -EBUSY)
1097 return err;
1098 }
1099 }
1100 return 0;
1101 }
1102
1103 EXPORT_SYMBOL(snd_pcm_suspend_all);
1104
1105 /* resume */
1106
1107 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1108 {
1109 struct snd_pcm_runtime *runtime = substream->runtime;
1110 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1111 return -ENOSYS;
1112 runtime->trigger_master = substream;
1113 return 0;
1114 }
1115
1116 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1117 {
1118 struct snd_pcm_runtime *runtime = substream->runtime;
1119 if (runtime->trigger_master != substream)
1120 return 0;
1121 /* DMA not running previously? */
1122 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1123 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1124 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1125 return 0;
1126 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1127 }
1128
1129 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1130 {
1131 if (substream->runtime->trigger_master == substream &&
1132 snd_pcm_running(substream))
1133 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1134 }
1135
1136 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1137 {
1138 struct snd_pcm_runtime *runtime = substream->runtime;
1139 snd_pcm_trigger_tstamp(substream);
1140 if (substream->timer)
1141 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1142 &runtime->trigger_tstamp);
1143 runtime->status->state = runtime->status->suspended_state;
1144 }
1145
1146 static struct action_ops snd_pcm_action_resume = {
1147 .pre_action = snd_pcm_pre_resume,
1148 .do_action = snd_pcm_do_resume,
1149 .undo_action = snd_pcm_undo_resume,
1150 .post_action = snd_pcm_post_resume
1151 };
1152
1153 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1154 {
1155 struct snd_card *card = substream->pcm->card;
1156 int res;
1157
1158 snd_power_lock(card);
1159 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1160 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1161 snd_power_unlock(card);
1162 return res;
1163 }
1164
1165 #else
1166
1167 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1168 {
1169 return -ENOSYS;
1170 }
1171
1172 #endif /* CONFIG_PM */
1173
1174 /*
1175 * xrun ioctl
1176 *
1177 * Change the RUNNING stream(s) to XRUN state.
1178 */
1179 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1180 {
1181 struct snd_card *card = substream->pcm->card;
1182 struct snd_pcm_runtime *runtime = substream->runtime;
1183 int result;
1184
1185 snd_power_lock(card);
1186 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1187 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1188 if (result < 0)
1189 goto _unlock;
1190 }
1191
1192 snd_pcm_stream_lock_irq(substream);
1193 switch (runtime->status->state) {
1194 case SNDRV_PCM_STATE_XRUN:
1195 result = 0; /* already there */
1196 break;
1197 case SNDRV_PCM_STATE_RUNNING:
1198 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1199 break;
1200 default:
1201 result = -EBADFD;
1202 }
1203 snd_pcm_stream_unlock_irq(substream);
1204 _unlock:
1205 snd_power_unlock(card);
1206 return result;
1207 }
1208
1209 /*
1210 * reset ioctl
1211 */
1212 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1213 {
1214 struct snd_pcm_runtime *runtime = substream->runtime;
1215 switch (runtime->status->state) {
1216 case SNDRV_PCM_STATE_RUNNING:
1217 case SNDRV_PCM_STATE_PREPARED:
1218 case SNDRV_PCM_STATE_PAUSED:
1219 case SNDRV_PCM_STATE_SUSPENDED:
1220 return 0;
1221 default:
1222 return -EBADFD;
1223 }
1224 }
1225
1226 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1227 {
1228 struct snd_pcm_runtime *runtime = substream->runtime;
1229 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1230 if (err < 0)
1231 return err;
1232 runtime->hw_ptr_base = 0;
1233 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1234 runtime->status->hw_ptr % runtime->period_size;
1235 runtime->silence_start = runtime->status->hw_ptr;
1236 runtime->silence_filled = 0;
1237 return 0;
1238 }
1239
1240 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1241 {
1242 struct snd_pcm_runtime *runtime = substream->runtime;
1243 runtime->control->appl_ptr = runtime->status->hw_ptr;
1244 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1245 runtime->silence_size > 0)
1246 snd_pcm_playback_silence(substream, ULONG_MAX);
1247 }
1248
1249 static struct action_ops snd_pcm_action_reset = {
1250 .pre_action = snd_pcm_pre_reset,
1251 .do_action = snd_pcm_do_reset,
1252 .post_action = snd_pcm_post_reset
1253 };
1254
1255 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1256 {
1257 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1258 }
1259
1260 /*
1261 * prepare ioctl
1262 */
1263 /* we use the second argument for updating f_flags */
1264 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1265 int f_flags)
1266 {
1267 struct snd_pcm_runtime *runtime = substream->runtime;
1268 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1269 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1270 return -EBADFD;
1271 if (snd_pcm_running(substream))
1272 return -EBUSY;
1273 substream->f_flags = f_flags;
1274 return 0;
1275 }
1276
1277 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1278 {
1279 int err;
1280 err = substream->ops->prepare(substream);
1281 if (err < 0)
1282 return err;
1283 return snd_pcm_do_reset(substream, 0);
1284 }
1285
1286 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1287 {
1288 struct snd_pcm_runtime *runtime = substream->runtime;
1289 runtime->control->appl_ptr = runtime->status->hw_ptr;
1290 runtime->status->state = SNDRV_PCM_STATE_PREPARED;
1291 }
1292
1293 static struct action_ops snd_pcm_action_prepare = {
1294 .pre_action = snd_pcm_pre_prepare,
1295 .do_action = snd_pcm_do_prepare,
1296 .post_action = snd_pcm_post_prepare
1297 };
1298
1299 /**
1300 * snd_pcm_prepare - prepare the PCM substream to be triggerable
1301 * @substream: the PCM substream instance
1302 * @file: file to refer f_flags
1303 */
1304 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1305 struct file *file)
1306 {
1307 int res;
1308 struct snd_card *card = substream->pcm->card;
1309 int f_flags;
1310
1311 if (file)
1312 f_flags = file->f_flags;
1313 else
1314 f_flags = substream->f_flags;
1315
1316 snd_power_lock(card);
1317 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1318 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1319 substream, f_flags);
1320 snd_power_unlock(card);
1321 return res;
1322 }
1323
1324 /*
1325 * drain ioctl
1326 */
1327
1328 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1329 {
1330 if (substream->f_flags & O_NONBLOCK)
1331 return -EAGAIN;
1332 substream->runtime->trigger_master = substream;
1333 return 0;
1334 }
1335
1336 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1337 {
1338 struct snd_pcm_runtime *runtime = substream->runtime;
1339 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1340 switch (runtime->status->state) {
1341 case SNDRV_PCM_STATE_PREPARED:
1342 /* start playback stream if possible */
1343 if (! snd_pcm_playback_empty(substream)) {
1344 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1345 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1346 }
1347 break;
1348 case SNDRV_PCM_STATE_RUNNING:
1349 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1350 break;
1351 default:
1352 break;
1353 }
1354 } else {
1355 /* stop running stream */
1356 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1357 int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1358 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1359 snd_pcm_do_stop(substream, new_state);
1360 snd_pcm_post_stop(substream, new_state);
1361 }
1362 }
1363 return 0;
1364 }
1365
1366 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1367 {
1368 }
1369
1370 static struct action_ops snd_pcm_action_drain_init = {
1371 .pre_action = snd_pcm_pre_drain_init,
1372 .do_action = snd_pcm_do_drain_init,
1373 .post_action = snd_pcm_post_drain_init
1374 };
1375
1376 struct drain_rec {
1377 struct snd_pcm_substream *substream;
1378 wait_queue_t wait;
1379 snd_pcm_uframes_t stop_threshold;
1380 };
1381
1382 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1383
1384 /*
1385 * Drain the stream(s).
1386 * When the substream is linked, sync until the draining of all playback streams
1387 * is finished.
1388 * After this call, all streams are supposed to be either SETUP or DRAINING
1389 * (capture only) state.
1390 */
1391 static int snd_pcm_drain(struct snd_pcm_substream *substream)
1392 {
1393 struct snd_card *card;
1394 struct snd_pcm_runtime *runtime;
1395 struct snd_pcm_substream *s;
1396 int result = 0;
1397 int i, num_drecs;
1398 struct drain_rec *drec, drec_tmp, *d;
1399
1400 card = substream->pcm->card;
1401 runtime = substream->runtime;
1402
1403 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1404 return -EBADFD;
1405
1406 snd_power_lock(card);
1407 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1408 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1409 if (result < 0) {
1410 snd_power_unlock(card);
1411 return result;
1412 }
1413 }
1414
1415 /* allocate temporary record for drain sync */
1416 down_read(&snd_pcm_link_rwsem);
1417 if (snd_pcm_stream_linked(substream)) {
1418 drec = kmalloc(substream->group->count * sizeof(*drec), GFP_KERNEL);
1419 if (! drec) {
1420 up_read(&snd_pcm_link_rwsem);
1421 snd_power_unlock(card);
1422 return -ENOMEM;
1423 }
1424 } else
1425 drec = &drec_tmp;
1426
1427 /* count only playback streams */
1428 num_drecs = 0;
1429 snd_pcm_group_for_each_entry(s, substream) {
1430 runtime = s->runtime;
1431 if (s->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1432 d = &drec[num_drecs++];
1433 d->substream = s;
1434 init_waitqueue_entry(&d->wait, current);
1435 add_wait_queue(&runtime->sleep, &d->wait);
1436 /* stop_threshold fixup to avoid endless loop when
1437 * stop_threshold > buffer_size
1438 */
1439 d->stop_threshold = runtime->stop_threshold;
1440 if (runtime->stop_threshold > runtime->buffer_size)
1441 runtime->stop_threshold = runtime->buffer_size;
1442 }
1443 }
1444 up_read(&snd_pcm_link_rwsem);
1445
1446 snd_pcm_stream_lock_irq(substream);
1447 /* resume pause */
1448 if (substream->runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1449 snd_pcm_pause(substream, 0);
1450
1451 /* pre-start/stop - all running streams are changed to DRAINING state */
1452 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1453 if (result < 0) {
1454 snd_pcm_stream_unlock_irq(substream);
1455 goto _error;
1456 }
1457
1458 for (;;) {
1459 long tout;
1460 if (signal_pending(current)) {
1461 result = -ERESTARTSYS;
1462 break;
1463 }
1464 /* all finished? */
1465 for (i = 0; i < num_drecs; i++) {
1466 runtime = drec[i].substream->runtime;
1467 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING)
1468 break;
1469 }
1470 if (i == num_drecs)
1471 break; /* yes, all drained */
1472
1473 set_current_state(TASK_INTERRUPTIBLE);
1474 snd_pcm_stream_unlock_irq(substream);
1475 snd_power_unlock(card);
1476 tout = schedule_timeout(10 * HZ);
1477 snd_power_lock(card);
1478 snd_pcm_stream_lock_irq(substream);
1479 if (tout == 0) {
1480 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1481 result = -ESTRPIPE;
1482 else {
1483 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1484 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1485 result = -EIO;
1486 }
1487 break;
1488 }
1489 }
1490
1491 snd_pcm_stream_unlock_irq(substream);
1492
1493 _error:
1494 for (i = 0; i < num_drecs; i++) {
1495 d = &drec[i];
1496 runtime = d->substream->runtime;
1497 remove_wait_queue(&runtime->sleep, &d->wait);
1498 runtime->stop_threshold = d->stop_threshold;
1499 }
1500
1501 if (drec != &drec_tmp)
1502 kfree(drec);
1503 snd_power_unlock(card);
1504
1505 return result;
1506 }
1507
1508 /*
1509 * drop ioctl
1510 *
1511 * Immediately put all linked substreams into SETUP state.
1512 */
1513 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1514 {
1515 struct snd_pcm_runtime *runtime;
1516 struct snd_card *card;
1517 int result = 0;
1518
1519 if (PCM_RUNTIME_CHECK(substream))
1520 return -ENXIO;
1521 runtime = substream->runtime;
1522 card = substream->pcm->card;
1523
1524 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1525 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1526 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1527 return -EBADFD;
1528
1529 snd_pcm_stream_lock_irq(substream);
1530 /* resume pause */
1531 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1532 snd_pcm_pause(substream, 0);
1533
1534 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1535 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1536 snd_pcm_stream_unlock_irq(substream);
1537
1538 return result;
1539 }
1540
1541
1542 /* WARNING: Don't forget to fput back the file */
1543 static struct file *snd_pcm_file_fd(int fd)
1544 {
1545 struct file *file;
1546 struct inode *inode;
1547 unsigned int minor;
1548
1549 file = fget(fd);
1550 if (!file)
1551 return NULL;
1552 inode = file->f_path.dentry->d_inode;
1553 if (!S_ISCHR(inode->i_mode) ||
1554 imajor(inode) != snd_major) {
1555 fput(file);
1556 return NULL;
1557 }
1558 minor = iminor(inode);
1559 if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1560 !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1561 fput(file);
1562 return NULL;
1563 }
1564 return file;
1565 }
1566
1567 /*
1568 * PCM link handling
1569 */
1570 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1571 {
1572 int res = 0;
1573 struct file *file;
1574 struct snd_pcm_file *pcm_file;
1575 struct snd_pcm_substream *substream1;
1576
1577 file = snd_pcm_file_fd(fd);
1578 if (!file)
1579 return -EBADFD;
1580 pcm_file = file->private_data;
1581 substream1 = pcm_file->substream;
1582 down_write(&snd_pcm_link_rwsem);
1583 write_lock_irq(&snd_pcm_link_rwlock);
1584 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1585 substream->runtime->status->state != substream1->runtime->status->state) {
1586 res = -EBADFD;
1587 goto _end;
1588 }
1589 if (snd_pcm_stream_linked(substream1)) {
1590 res = -EALREADY;
1591 goto _end;
1592 }
1593 if (!snd_pcm_stream_linked(substream)) {
1594 substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC);
1595 if (substream->group == NULL) {
1596 res = -ENOMEM;
1597 goto _end;
1598 }
1599 spin_lock_init(&substream->group->lock);
1600 INIT_LIST_HEAD(&substream->group->substreams);
1601 list_add_tail(&substream->link_list, &substream->group->substreams);
1602 substream->group->count = 1;
1603 }
1604 list_add_tail(&substream1->link_list, &substream->group->substreams);
1605 substream->group->count++;
1606 substream1->group = substream->group;
1607 _end:
1608 write_unlock_irq(&snd_pcm_link_rwlock);
1609 up_write(&snd_pcm_link_rwsem);
1610 fput(file);
1611 return res;
1612 }
1613
1614 static void relink_to_local(struct snd_pcm_substream *substream)
1615 {
1616 substream->group = &substream->self_group;
1617 INIT_LIST_HEAD(&substream->self_group.substreams);
1618 list_add_tail(&substream->link_list, &substream->self_group.substreams);
1619 }
1620
1621 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1622 {
1623 struct snd_pcm_substream *s;
1624 int res = 0;
1625
1626 down_write(&snd_pcm_link_rwsem);
1627 write_lock_irq(&snd_pcm_link_rwlock);
1628 if (!snd_pcm_stream_linked(substream)) {
1629 res = -EALREADY;
1630 goto _end;
1631 }
1632 list_del(&substream->link_list);
1633 substream->group->count--;
1634 if (substream->group->count == 1) { /* detach the last stream, too */
1635 snd_pcm_group_for_each_entry(s, substream) {
1636 relink_to_local(s);
1637 break;
1638 }
1639 kfree(substream->group);
1640 }
1641 relink_to_local(substream);
1642 _end:
1643 write_unlock_irq(&snd_pcm_link_rwlock);
1644 up_write(&snd_pcm_link_rwsem);
1645 return res;
1646 }
1647
1648 /*
1649 * hw configurator
1650 */
1651 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1652 struct snd_pcm_hw_rule *rule)
1653 {
1654 struct snd_interval t;
1655 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1656 hw_param_interval_c(params, rule->deps[1]), &t);
1657 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1658 }
1659
1660 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1661 struct snd_pcm_hw_rule *rule)
1662 {
1663 struct snd_interval t;
1664 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1665 hw_param_interval_c(params, rule->deps[1]), &t);
1666 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1667 }
1668
1669 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1670 struct snd_pcm_hw_rule *rule)
1671 {
1672 struct snd_interval t;
1673 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1674 hw_param_interval_c(params, rule->deps[1]),
1675 (unsigned long) rule->private, &t);
1676 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1677 }
1678
1679 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1680 struct snd_pcm_hw_rule *rule)
1681 {
1682 struct snd_interval t;
1683 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1684 (unsigned long) rule->private,
1685 hw_param_interval_c(params, rule->deps[1]), &t);
1686 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1687 }
1688
1689 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1690 struct snd_pcm_hw_rule *rule)
1691 {
1692 unsigned int k;
1693 struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1694 struct snd_mask m;
1695 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1696 snd_mask_any(&m);
1697 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1698 int bits;
1699 if (! snd_mask_test(mask, k))
1700 continue;
1701 bits = snd_pcm_format_physical_width(k);
1702 if (bits <= 0)
1703 continue; /* ignore invalid formats */
1704 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1705 snd_mask_reset(&m, k);
1706 }
1707 return snd_mask_refine(mask, &m);
1708 }
1709
1710 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1711 struct snd_pcm_hw_rule *rule)
1712 {
1713 struct snd_interval t;
1714 unsigned int k;
1715 t.min = UINT_MAX;
1716 t.max = 0;
1717 t.openmin = 0;
1718 t.openmax = 0;
1719 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1720 int bits;
1721 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1722 continue;
1723 bits = snd_pcm_format_physical_width(k);
1724 if (bits <= 0)
1725 continue; /* ignore invalid formats */
1726 if (t.min > (unsigned)bits)
1727 t.min = bits;
1728 if (t.max < (unsigned)bits)
1729 t.max = bits;
1730 }
1731 t.integer = 1;
1732 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1733 }
1734
1735 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1736 #error "Change this table"
1737 #endif
1738
1739 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1740 48000, 64000, 88200, 96000, 176400, 192000 };
1741
1742 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1743 .count = ARRAY_SIZE(rates),
1744 .list = rates,
1745 };
1746
1747 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1748 struct snd_pcm_hw_rule *rule)
1749 {
1750 struct snd_pcm_hardware *hw = rule->private;
1751 return snd_interval_list(hw_param_interval(params, rule->var),
1752 snd_pcm_known_rates.count,
1753 snd_pcm_known_rates.list, hw->rates);
1754 }
1755
1756 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1757 struct snd_pcm_hw_rule *rule)
1758 {
1759 struct snd_interval t;
1760 struct snd_pcm_substream *substream = rule->private;
1761 t.min = 0;
1762 t.max = substream->buffer_bytes_max;
1763 t.openmin = 0;
1764 t.openmax = 0;
1765 t.integer = 1;
1766 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1767 }
1768
1769 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1770 {
1771 struct snd_pcm_runtime *runtime = substream->runtime;
1772 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1773 int k, err;
1774
1775 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1776 snd_mask_any(constrs_mask(constrs, k));
1777 }
1778
1779 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1780 snd_interval_any(constrs_interval(constrs, k));
1781 }
1782
1783 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1784 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1785 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1786 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1787 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1788
1789 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1790 snd_pcm_hw_rule_format, NULL,
1791 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1792 if (err < 0)
1793 return err;
1794 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1795 snd_pcm_hw_rule_sample_bits, NULL,
1796 SNDRV_PCM_HW_PARAM_FORMAT,
1797 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1798 if (err < 0)
1799 return err;
1800 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1801 snd_pcm_hw_rule_div, NULL,
1802 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1803 if (err < 0)
1804 return err;
1805 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1806 snd_pcm_hw_rule_mul, NULL,
1807 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1808 if (err < 0)
1809 return err;
1810 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1811 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1812 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1813 if (err < 0)
1814 return err;
1815 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1816 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1817 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1818 if (err < 0)
1819 return err;
1820 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1821 snd_pcm_hw_rule_div, NULL,
1822 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1823 if (err < 0)
1824 return err;
1825 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1826 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1827 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1828 if (err < 0)
1829 return err;
1830 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1831 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1832 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1833 if (err < 0)
1834 return err;
1835 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1836 snd_pcm_hw_rule_div, NULL,
1837 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1838 if (err < 0)
1839 return err;
1840 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1841 snd_pcm_hw_rule_div, NULL,
1842 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1843 if (err < 0)
1844 return err;
1845 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1846 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1847 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1848 if (err < 0)
1849 return err;
1850 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1851 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1852 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1853 if (err < 0)
1854 return err;
1855 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1856 snd_pcm_hw_rule_mul, NULL,
1857 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1858 if (err < 0)
1859 return err;
1860 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1861 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1862 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1863 if (err < 0)
1864 return err;
1865 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1866 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1867 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1868 if (err < 0)
1869 return err;
1870 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1871 snd_pcm_hw_rule_muldivk, (void*) 8,
1872 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1873 if (err < 0)
1874 return err;
1875 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1876 snd_pcm_hw_rule_muldivk, (void*) 8,
1877 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1878 if (err < 0)
1879 return err;
1880 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1881 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1882 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1883 if (err < 0)
1884 return err;
1885 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1886 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1887 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1888 if (err < 0)
1889 return err;
1890 return 0;
1891 }
1892
1893 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1894 {
1895 struct snd_pcm_runtime *runtime = substream->runtime;
1896 struct snd_pcm_hardware *hw = &runtime->hw;
1897 int err;
1898 unsigned int mask = 0;
1899
1900 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1901 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1902 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1903 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1904 if (hw->info & SNDRV_PCM_INFO_MMAP) {
1905 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1906 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1907 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1908 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1909 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1910 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1911 }
1912 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1913 if (err < 0)
1914 return err;
1915
1916 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1917 if (err < 0)
1918 return err;
1919
1920 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1921 if (err < 0)
1922 return err;
1923
1924 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1925 hw->channels_min, hw->channels_max);
1926 if (err < 0)
1927 return err;
1928
1929 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1930 hw->rate_min, hw->rate_max);
1931 if (err < 0)
1932 return err;
1933
1934 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1935 hw->period_bytes_min, hw->period_bytes_max);
1936 if (err < 0)
1937 return err;
1938
1939 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1940 hw->periods_min, hw->periods_max);
1941 if (err < 0)
1942 return err;
1943
1944 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1945 hw->period_bytes_min, hw->buffer_bytes_max);
1946 if (err < 0)
1947 return err;
1948
1949 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1950 snd_pcm_hw_rule_buffer_bytes_max, substream,
1951 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1952 if (err < 0)
1953 return err;
1954
1955 /* FIXME: remove */
1956 if (runtime->dma_bytes) {
1957 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
1958 if (err < 0)
1959 return -EINVAL;
1960 }
1961
1962 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
1963 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1964 snd_pcm_hw_rule_rate, hw,
1965 SNDRV_PCM_HW_PARAM_RATE, -1);
1966 if (err < 0)
1967 return err;
1968 }
1969
1970 /* FIXME: this belong to lowlevel */
1971 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
1972
1973 return 0;
1974 }
1975
1976 static void pcm_release_private(struct snd_pcm_substream *substream)
1977 {
1978 snd_pcm_unlink(substream);
1979 }
1980
1981 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
1982 {
1983 substream->ref_count--;
1984 if (substream->ref_count > 0)
1985 return;
1986
1987 snd_pcm_drop(substream);
1988 if (substream->hw_opened) {
1989 if (substream->ops->hw_free != NULL)
1990 substream->ops->hw_free(substream);
1991 substream->ops->close(substream);
1992 substream->hw_opened = 0;
1993 }
1994 if (substream->pcm_release) {
1995 substream->pcm_release(substream);
1996 substream->pcm_release = NULL;
1997 }
1998 snd_pcm_detach_substream(substream);
1999 }
2000
2001 EXPORT_SYMBOL(snd_pcm_release_substream);
2002
2003 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2004 struct file *file,
2005 struct snd_pcm_substream **rsubstream)
2006 {
2007 struct snd_pcm_substream *substream;
2008 int err;
2009
2010 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2011 if (err < 0)
2012 return err;
2013 if (substream->ref_count > 1) {
2014 *rsubstream = substream;
2015 return 0;
2016 }
2017
2018 err = snd_pcm_hw_constraints_init(substream);
2019 if (err < 0) {
2020 snd_printd("snd_pcm_hw_constraints_init failed\n");
2021 goto error;
2022 }
2023
2024 if ((err = substream->ops->open(substream)) < 0)
2025 goto error;
2026
2027 substream->hw_opened = 1;
2028
2029 err = snd_pcm_hw_constraints_complete(substream);
2030 if (err < 0) {
2031 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2032 goto error;
2033 }
2034
2035 *rsubstream = substream;
2036 return 0;
2037
2038 error:
2039 snd_pcm_release_substream(substream);
2040 return err;
2041 }
2042
2043 EXPORT_SYMBOL(snd_pcm_open_substream);
2044
2045 static int snd_pcm_open_file(struct file *file,
2046 struct snd_pcm *pcm,
2047 int stream,
2048 struct snd_pcm_file **rpcm_file)
2049 {
2050 struct snd_pcm_file *pcm_file;
2051 struct snd_pcm_substream *substream;
2052 struct snd_pcm_str *str;
2053 int err;
2054
2055 if (rpcm_file)
2056 *rpcm_file = NULL;
2057
2058 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2059 if (err < 0)
2060 return err;
2061
2062 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2063 if (pcm_file == NULL) {
2064 snd_pcm_release_substream(substream);
2065 return -ENOMEM;
2066 }
2067 pcm_file->substream = substream;
2068 if (substream->ref_count == 1) {
2069 str = substream->pstr;
2070 substream->file = pcm_file;
2071 substream->pcm_release = pcm_release_private;
2072 }
2073 file->private_data = pcm_file;
2074 if (rpcm_file)
2075 *rpcm_file = pcm_file;
2076 return 0;
2077 }
2078
2079 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2080 {
2081 struct snd_pcm *pcm;
2082
2083 pcm = snd_lookup_minor_data(iminor(inode),
2084 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2085 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2086 }
2087
2088 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2089 {
2090 struct snd_pcm *pcm;
2091
2092 pcm = snd_lookup_minor_data(iminor(inode),
2093 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2094 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2095 }
2096
2097 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2098 {
2099 int err;
2100 struct snd_pcm_file *pcm_file;
2101 wait_queue_t wait;
2102
2103 if (pcm == NULL) {
2104 err = -ENODEV;
2105 goto __error1;
2106 }
2107 err = snd_card_file_add(pcm->card, file);
2108 if (err < 0)
2109 goto __error1;
2110 if (!try_module_get(pcm->card->module)) {
2111 err = -EFAULT;
2112 goto __error2;
2113 }
2114 init_waitqueue_entry(&wait, current);
2115 add_wait_queue(&pcm->open_wait, &wait);
2116 mutex_lock(&pcm->open_mutex);
2117 while (1) {
2118 err = snd_pcm_open_file(file, pcm, stream, &pcm_file);
2119 if (err >= 0)
2120 break;
2121 if (err == -EAGAIN) {
2122 if (file->f_flags & O_NONBLOCK) {
2123 err = -EBUSY;
2124 break;
2125 }
2126 } else
2127 break;
2128 set_current_state(TASK_INTERRUPTIBLE);
2129 mutex_unlock(&pcm->open_mutex);
2130 schedule();
2131 mutex_lock(&pcm->open_mutex);
2132 if (signal_pending(current)) {
2133 err = -ERESTARTSYS;
2134 break;
2135 }
2136 }
2137 remove_wait_queue(&pcm->open_wait, &wait);
2138 mutex_unlock(&pcm->open_mutex);
2139 if (err < 0)
2140 goto __error;
2141 return err;
2142
2143 __error:
2144 module_put(pcm->card->module);
2145 __error2:
2146 snd_card_file_remove(pcm->card, file);
2147 __error1:
2148 return err;
2149 }
2150
2151 static int snd_pcm_release(struct inode *inode, struct file *file)
2152 {
2153 struct snd_pcm *pcm;
2154 struct snd_pcm_substream *substream;
2155 struct snd_pcm_file *pcm_file;
2156
2157 pcm_file = file->private_data;
2158 substream = pcm_file->substream;
2159 if (snd_BUG_ON(!substream))
2160 return -ENXIO;
2161 pcm = substream->pcm;
2162 mutex_lock(&pcm->open_mutex);
2163 snd_pcm_release_substream(substream);
2164 kfree(pcm_file);
2165 mutex_unlock(&pcm->open_mutex);
2166 wake_up(&pcm->open_wait);
2167 module_put(pcm->card->module);
2168 snd_card_file_remove(pcm->card, file);
2169 return 0;
2170 }
2171
2172 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2173 snd_pcm_uframes_t frames)
2174 {
2175 struct snd_pcm_runtime *runtime = substream->runtime;
2176 snd_pcm_sframes_t appl_ptr;
2177 snd_pcm_sframes_t ret;
2178 snd_pcm_sframes_t hw_avail;
2179
2180 if (frames == 0)
2181 return 0;
2182
2183 snd_pcm_stream_lock_irq(substream);
2184 switch (runtime->status->state) {
2185 case SNDRV_PCM_STATE_PREPARED:
2186 break;
2187 case SNDRV_PCM_STATE_DRAINING:
2188 case SNDRV_PCM_STATE_RUNNING:
2189 if (snd_pcm_update_hw_ptr(substream) >= 0)
2190 break;
2191 /* Fall through */
2192 case SNDRV_PCM_STATE_XRUN:
2193 ret = -EPIPE;
2194 goto __end;
2195 default:
2196 ret = -EBADFD;
2197 goto __end;
2198 }
2199
2200 hw_avail = snd_pcm_playback_hw_avail(runtime);
2201 if (hw_avail <= 0) {
2202 ret = 0;
2203 goto __end;
2204 }
2205 if (frames > (snd_pcm_uframes_t)hw_avail)
2206 frames = hw_avail;
2207 appl_ptr = runtime->control->appl_ptr - frames;
2208 if (appl_ptr < 0)
2209 appl_ptr += runtime->boundary;
2210 runtime->control->appl_ptr = appl_ptr;
2211 ret = frames;
2212 __end:
2213 snd_pcm_stream_unlock_irq(substream);
2214 return ret;
2215 }
2216
2217 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2218 snd_pcm_uframes_t frames)
2219 {
2220 struct snd_pcm_runtime *runtime = substream->runtime;
2221 snd_pcm_sframes_t appl_ptr;
2222 snd_pcm_sframes_t ret;
2223 snd_pcm_sframes_t hw_avail;
2224
2225 if (frames == 0)
2226 return 0;
2227
2228 snd_pcm_stream_lock_irq(substream);
2229 switch (runtime->status->state) {
2230 case SNDRV_PCM_STATE_PREPARED:
2231 case SNDRV_PCM_STATE_DRAINING:
2232 break;
2233 case SNDRV_PCM_STATE_RUNNING:
2234 if (snd_pcm_update_hw_ptr(substream) >= 0)
2235 break;
2236 /* Fall through */
2237 case SNDRV_PCM_STATE_XRUN:
2238 ret = -EPIPE;
2239 goto __end;
2240 default:
2241 ret = -EBADFD;
2242 goto __end;
2243 }
2244
2245 hw_avail = snd_pcm_capture_hw_avail(runtime);
2246 if (hw_avail <= 0) {
2247 ret = 0;
2248 goto __end;
2249 }
2250 if (frames > (snd_pcm_uframes_t)hw_avail)
2251 frames = hw_avail;
2252 appl_ptr = runtime->control->appl_ptr - frames;
2253 if (appl_ptr < 0)
2254 appl_ptr += runtime->boundary;
2255 runtime->control->appl_ptr = appl_ptr;
2256 ret = frames;
2257 __end:
2258 snd_pcm_stream_unlock_irq(substream);
2259 return ret;
2260 }
2261
2262 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2263 snd_pcm_uframes_t frames)
2264 {
2265 struct snd_pcm_runtime *runtime = substream->runtime;
2266 snd_pcm_sframes_t appl_ptr;
2267 snd_pcm_sframes_t ret;
2268 snd_pcm_sframes_t avail;
2269
2270 if (frames == 0)
2271 return 0;
2272
2273 snd_pcm_stream_lock_irq(substream);
2274 switch (runtime->status->state) {
2275 case SNDRV_PCM_STATE_PREPARED:
2276 case SNDRV_PCM_STATE_PAUSED:
2277 break;
2278 case SNDRV_PCM_STATE_DRAINING:
2279 case SNDRV_PCM_STATE_RUNNING:
2280 if (snd_pcm_update_hw_ptr(substream) >= 0)
2281 break;
2282 /* Fall through */
2283 case SNDRV_PCM_STATE_XRUN:
2284 ret = -EPIPE;
2285 goto __end;
2286 default:
2287 ret = -EBADFD;
2288 goto __end;
2289 }
2290
2291 avail = snd_pcm_playback_avail(runtime);
2292 if (avail <= 0) {
2293 ret = 0;
2294 goto __end;
2295 }
2296 if (frames > (snd_pcm_uframes_t)avail)
2297 frames = avail;
2298 appl_ptr = runtime->control->appl_ptr + frames;
2299 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2300 appl_ptr -= runtime->boundary;
2301 runtime->control->appl_ptr = appl_ptr;
2302 ret = frames;
2303 __end:
2304 snd_pcm_stream_unlock_irq(substream);
2305 return ret;
2306 }
2307
2308 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2309 snd_pcm_uframes_t frames)
2310 {
2311 struct snd_pcm_runtime *runtime = substream->runtime;
2312 snd_pcm_sframes_t appl_ptr;
2313 snd_pcm_sframes_t ret;
2314 snd_pcm_sframes_t avail;
2315
2316 if (frames == 0)
2317 return 0;
2318
2319 snd_pcm_stream_lock_irq(substream);
2320 switch (runtime->status->state) {
2321 case SNDRV_PCM_STATE_PREPARED:
2322 case SNDRV_PCM_STATE_DRAINING:
2323 case SNDRV_PCM_STATE_PAUSED:
2324 break;
2325 case SNDRV_PCM_STATE_RUNNING:
2326 if (snd_pcm_update_hw_ptr(substream) >= 0)
2327 break;
2328 /* Fall through */
2329 case SNDRV_PCM_STATE_XRUN:
2330 ret = -EPIPE;
2331 goto __end;
2332 default:
2333 ret = -EBADFD;
2334 goto __end;
2335 }
2336
2337 avail = snd_pcm_capture_avail(runtime);
2338 if (avail <= 0) {
2339 ret = 0;
2340 goto __end;
2341 }
2342 if (frames > (snd_pcm_uframes_t)avail)
2343 frames = avail;
2344 appl_ptr = runtime->control->appl_ptr + frames;
2345 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2346 appl_ptr -= runtime->boundary;
2347 runtime->control->appl_ptr = appl_ptr;
2348 ret = frames;
2349 __end:
2350 snd_pcm_stream_unlock_irq(substream);
2351 return ret;
2352 }
2353
2354 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2355 {
2356 struct snd_pcm_runtime *runtime = substream->runtime;
2357 int err;
2358
2359 snd_pcm_stream_lock_irq(substream);
2360 switch (runtime->status->state) {
2361 case SNDRV_PCM_STATE_DRAINING:
2362 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2363 goto __badfd;
2364 case SNDRV_PCM_STATE_RUNNING:
2365 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2366 break;
2367 /* Fall through */
2368 case SNDRV_PCM_STATE_PREPARED:
2369 case SNDRV_PCM_STATE_SUSPENDED:
2370 err = 0;
2371 break;
2372 case SNDRV_PCM_STATE_XRUN:
2373 err = -EPIPE;
2374 break;
2375 default:
2376 __badfd:
2377 err = -EBADFD;
2378 break;
2379 }
2380 snd_pcm_stream_unlock_irq(substream);
2381 return err;
2382 }
2383
2384 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2385 snd_pcm_sframes_t __user *res)
2386 {
2387 struct snd_pcm_runtime *runtime = substream->runtime;
2388 int err;
2389 snd_pcm_sframes_t n = 0;
2390
2391 snd_pcm_stream_lock_irq(substream);
2392 switch (runtime->status->state) {
2393 case SNDRV_PCM_STATE_DRAINING:
2394 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2395 goto __badfd;
2396 case SNDRV_PCM_STATE_RUNNING:
2397 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2398 break;
2399 /* Fall through */
2400 case SNDRV_PCM_STATE_PREPARED:
2401 case SNDRV_PCM_STATE_SUSPENDED:
2402 err = 0;
2403 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2404 n = snd_pcm_playback_hw_avail(runtime);
2405 else
2406 n = snd_pcm_capture_avail(runtime);
2407 break;
2408 case SNDRV_PCM_STATE_XRUN:
2409 err = -EPIPE;
2410 break;
2411 default:
2412 __badfd:
2413 err = -EBADFD;
2414 break;
2415 }
2416 snd_pcm_stream_unlock_irq(substream);
2417 if (!err)
2418 if (put_user(n, res))
2419 err = -EFAULT;
2420 return err;
2421 }
2422
2423 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2424 struct snd_pcm_sync_ptr __user *_sync_ptr)
2425 {
2426 struct snd_pcm_runtime *runtime = substream->runtime;
2427 struct snd_pcm_sync_ptr sync_ptr;
2428 volatile struct snd_pcm_mmap_status *status;
2429 volatile struct snd_pcm_mmap_control *control;
2430 int err;
2431
2432 memset(&sync_ptr, 0, sizeof(sync_ptr));
2433 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2434 return -EFAULT;
2435 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2436 return -EFAULT;
2437 status = runtime->status;
2438 control = runtime->control;
2439 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2440 err = snd_pcm_hwsync(substream);
2441 if (err < 0)
2442 return err;
2443 }
2444 snd_pcm_stream_lock_irq(substream);
2445 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2446 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2447 else
2448 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2449 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2450 control->avail_min = sync_ptr.c.control.avail_min;
2451 else
2452 sync_ptr.c.control.avail_min = control->avail_min;
2453 sync_ptr.s.status.state = status->state;
2454 sync_ptr.s.status.hw_ptr = status->hw_ptr;
2455 sync_ptr.s.status.tstamp = status->tstamp;
2456 sync_ptr.s.status.suspended_state = status->suspended_state;
2457 snd_pcm_stream_unlock_irq(substream);
2458 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2459 return -EFAULT;
2460 return 0;
2461 }
2462
2463 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2464 {
2465 struct snd_pcm_runtime *runtime = substream->runtime;
2466 int arg;
2467
2468 if (get_user(arg, _arg))
2469 return -EFAULT;
2470 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2471 return -EINVAL;
2472 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2473 if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2474 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2475 return 0;
2476 }
2477
2478 static int snd_pcm_common_ioctl1(struct file *file,
2479 struct snd_pcm_substream *substream,
2480 unsigned int cmd, void __user *arg)
2481 {
2482 switch (cmd) {
2483 case SNDRV_PCM_IOCTL_PVERSION:
2484 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2485 case SNDRV_PCM_IOCTL_INFO:
2486 return snd_pcm_info_user(substream, arg);
2487 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2488 return 0;
2489 case SNDRV_PCM_IOCTL_TTSTAMP:
2490 return snd_pcm_tstamp(substream, arg);
2491 case SNDRV_PCM_IOCTL_HW_REFINE:
2492 return snd_pcm_hw_refine_user(substream, arg);
2493 case SNDRV_PCM_IOCTL_HW_PARAMS:
2494 return snd_pcm_hw_params_user(substream, arg);
2495 case SNDRV_PCM_IOCTL_HW_FREE:
2496 return snd_pcm_hw_free(substream);
2497 case SNDRV_PCM_IOCTL_SW_PARAMS:
2498 return snd_pcm_sw_params_user(substream, arg);
2499 case SNDRV_PCM_IOCTL_STATUS:
2500 return snd_pcm_status_user(substream, arg);
2501 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2502 return snd_pcm_channel_info_user(substream, arg);
2503 case SNDRV_PCM_IOCTL_PREPARE:
2504 return snd_pcm_prepare(substream, file);
2505 case SNDRV_PCM_IOCTL_RESET:
2506 return snd_pcm_reset(substream);
2507 case SNDRV_PCM_IOCTL_START:
2508 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2509 case SNDRV_PCM_IOCTL_LINK:
2510 return snd_pcm_link(substream, (int)(unsigned long) arg);
2511 case SNDRV_PCM_IOCTL_UNLINK:
2512 return snd_pcm_unlink(substream);
2513 case SNDRV_PCM_IOCTL_RESUME:
2514 return snd_pcm_resume(substream);
2515 case SNDRV_PCM_IOCTL_XRUN:
2516 return snd_pcm_xrun(substream);
2517 case SNDRV_PCM_IOCTL_HWSYNC:
2518 return snd_pcm_hwsync(substream);
2519 case SNDRV_PCM_IOCTL_DELAY:
2520 return snd_pcm_delay(substream, arg);
2521 case SNDRV_PCM_IOCTL_SYNC_PTR:
2522 return snd_pcm_sync_ptr(substream, arg);
2523 #ifdef CONFIG_SND_SUPPORT_OLD_API
2524 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2525 return snd_pcm_hw_refine_old_user(substream, arg);
2526 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2527 return snd_pcm_hw_params_old_user(substream, arg);
2528 #endif
2529 case SNDRV_PCM_IOCTL_DRAIN:
2530 return snd_pcm_drain(substream);
2531 case SNDRV_PCM_IOCTL_DROP:
2532 return snd_pcm_drop(substream);
2533 case SNDRV_PCM_IOCTL_PAUSE:
2534 {
2535 int res;
2536 snd_pcm_stream_lock_irq(substream);
2537 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2538 snd_pcm_stream_unlock_irq(substream);
2539 return res;
2540 }
2541 }
2542 snd_printd("unknown ioctl = 0x%x\n", cmd);
2543 return -ENOTTY;
2544 }
2545
2546 static int snd_pcm_playback_ioctl1(struct file *file,
2547 struct snd_pcm_substream *substream,
2548 unsigned int cmd, void __user *arg)
2549 {
2550 if (snd_BUG_ON(!substream))
2551 return -ENXIO;
2552 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2553 return -EINVAL;
2554 switch (cmd) {
2555 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2556 {
2557 struct snd_xferi xferi;
2558 struct snd_xferi __user *_xferi = arg;
2559 struct snd_pcm_runtime *runtime = substream->runtime;
2560 snd_pcm_sframes_t result;
2561 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2562 return -EBADFD;
2563 if (put_user(0, &_xferi->result))
2564 return -EFAULT;
2565 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2566 return -EFAULT;
2567 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2568 __put_user(result, &_xferi->result);
2569 return result < 0 ? result : 0;
2570 }
2571 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2572 {
2573 struct snd_xfern xfern;
2574 struct snd_xfern __user *_xfern = arg;
2575 struct snd_pcm_runtime *runtime = substream->runtime;
2576 void __user **bufs;
2577 snd_pcm_sframes_t result;
2578 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2579 return -EBADFD;
2580 if (runtime->channels > 128)
2581 return -EINVAL;
2582 if (put_user(0, &_xfern->result))
2583 return -EFAULT;
2584 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2585 return -EFAULT;
2586
2587 bufs = memdup_user(xfern.bufs,
2588 sizeof(void *) * runtime->channels);
2589 if (IS_ERR(bufs))
2590 return PTR_ERR(bufs);
2591 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2592 kfree(bufs);
2593 __put_user(result, &_xfern->result);
2594 return result < 0 ? result : 0;
2595 }
2596 case SNDRV_PCM_IOCTL_REWIND:
2597 {
2598 snd_pcm_uframes_t frames;
2599 snd_pcm_uframes_t __user *_frames = arg;
2600 snd_pcm_sframes_t result;
2601 if (get_user(frames, _frames))
2602 return -EFAULT;
2603 if (put_user(0, _frames))
2604 return -EFAULT;
2605 result = snd_pcm_playback_rewind(substream, frames);
2606 __put_user(result, _frames);
2607 return result < 0 ? result : 0;
2608 }
2609 case SNDRV_PCM_IOCTL_FORWARD:
2610 {
2611 snd_pcm_uframes_t frames;
2612 snd_pcm_uframes_t __user *_frames = arg;
2613 snd_pcm_sframes_t result;
2614 if (get_user(frames, _frames))
2615 return -EFAULT;
2616 if (put_user(0, _frames))
2617 return -EFAULT;
2618 result = snd_pcm_playback_forward(substream, frames);
2619 __put_user(result, _frames);
2620 return result < 0 ? result : 0;
2621 }
2622 }
2623 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2624 }
2625
2626 static int snd_pcm_capture_ioctl1(struct file *file,
2627 struct snd_pcm_substream *substream,
2628 unsigned int cmd, void __user *arg)
2629 {
2630 if (snd_BUG_ON(!substream))
2631 return -ENXIO;
2632 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2633 return -EINVAL;
2634 switch (cmd) {
2635 case SNDRV_PCM_IOCTL_READI_FRAMES:
2636 {
2637 struct snd_xferi xferi;
2638 struct snd_xferi __user *_xferi = arg;
2639 struct snd_pcm_runtime *runtime = substream->runtime;
2640 snd_pcm_sframes_t result;
2641 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2642 return -EBADFD;
2643 if (put_user(0, &_xferi->result))
2644 return -EFAULT;
2645 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2646 return -EFAULT;
2647 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2648 __put_user(result, &_xferi->result);
2649 return result < 0 ? result : 0;
2650 }
2651 case SNDRV_PCM_IOCTL_READN_FRAMES:
2652 {
2653 struct snd_xfern xfern;
2654 struct snd_xfern __user *_xfern = arg;
2655 struct snd_pcm_runtime *runtime = substream->runtime;
2656 void *bufs;
2657 snd_pcm_sframes_t result;
2658 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2659 return -EBADFD;
2660 if (runtime->channels > 128)
2661 return -EINVAL;
2662 if (put_user(0, &_xfern->result))
2663 return -EFAULT;
2664 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2665 return -EFAULT;
2666
2667 bufs = memdup_user(xfern.bufs,
2668 sizeof(void *) * runtime->channels);
2669 if (IS_ERR(bufs))
2670 return PTR_ERR(bufs);
2671 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2672 kfree(bufs);
2673 __put_user(result, &_xfern->result);
2674 return result < 0 ? result : 0;
2675 }
2676 case SNDRV_PCM_IOCTL_REWIND:
2677 {
2678 snd_pcm_uframes_t frames;
2679 snd_pcm_uframes_t __user *_frames = arg;
2680 snd_pcm_sframes_t result;
2681 if (get_user(frames, _frames))
2682 return -EFAULT;
2683 if (put_user(0, _frames))
2684 return -EFAULT;
2685 result = snd_pcm_capture_rewind(substream, frames);
2686 __put_user(result, _frames);
2687 return result < 0 ? result : 0;
2688 }
2689 case SNDRV_PCM_IOCTL_FORWARD:
2690 {
2691 snd_pcm_uframes_t frames;
2692 snd_pcm_uframes_t __user *_frames = arg;
2693 snd_pcm_sframes_t result;
2694 if (get_user(frames, _frames))
2695 return -EFAULT;
2696 if (put_user(0, _frames))
2697 return -EFAULT;
2698 result = snd_pcm_capture_forward(substream, frames);
2699 __put_user(result, _frames);
2700 return result < 0 ? result : 0;
2701 }
2702 }
2703 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2704 }
2705
2706 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2707 unsigned long arg)
2708 {
2709 struct snd_pcm_file *pcm_file;
2710
2711 pcm_file = file->private_data;
2712
2713 if (((cmd >> 8) & 0xff) != 'A')
2714 return -ENOTTY;
2715
2716 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2717 (void __user *)arg);
2718 }
2719
2720 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2721 unsigned long arg)
2722 {
2723 struct snd_pcm_file *pcm_file;
2724
2725 pcm_file = file->private_data;
2726
2727 if (((cmd >> 8) & 0xff) != 'A')
2728 return -ENOTTY;
2729
2730 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2731 (void __user *)arg);
2732 }
2733
2734 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2735 unsigned int cmd, void *arg)
2736 {
2737 mm_segment_t fs;
2738 int result;
2739
2740 fs = snd_enter_user();
2741 switch (substream->stream) {
2742 case SNDRV_PCM_STREAM_PLAYBACK:
2743 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2744 (void __user *)arg);
2745 break;
2746 case SNDRV_PCM_STREAM_CAPTURE:
2747 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2748 (void __user *)arg);
2749 break;
2750 default:
2751 result = -EINVAL;
2752 break;
2753 }
2754 snd_leave_user(fs);
2755 return result;
2756 }
2757
2758 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2759
2760 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2761 loff_t * offset)
2762 {
2763 struct snd_pcm_file *pcm_file;
2764 struct snd_pcm_substream *substream;
2765 struct snd_pcm_runtime *runtime;
2766 snd_pcm_sframes_t result;
2767
2768 pcm_file = file->private_data;
2769 substream = pcm_file->substream;
2770 if (PCM_RUNTIME_CHECK(substream))
2771 return -ENXIO;
2772 runtime = substream->runtime;
2773 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2774 return -EBADFD;
2775 if (!frame_aligned(runtime, count))
2776 return -EINVAL;
2777 count = bytes_to_frames(runtime, count);
2778 result = snd_pcm_lib_read(substream, buf, count);
2779 if (result > 0)
2780 result = frames_to_bytes(runtime, result);
2781 return result;
2782 }
2783
2784 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2785 size_t count, loff_t * offset)
2786 {
2787 struct snd_pcm_file *pcm_file;
2788 struct snd_pcm_substream *substream;
2789 struct snd_pcm_runtime *runtime;
2790 snd_pcm_sframes_t result;
2791
2792 pcm_file = file->private_data;
2793 substream = pcm_file->substream;
2794 if (PCM_RUNTIME_CHECK(substream))
2795 return -ENXIO;
2796 runtime = substream->runtime;
2797 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2798 return -EBADFD;
2799 if (!frame_aligned(runtime, count))
2800 return -EINVAL;
2801 count = bytes_to_frames(runtime, count);
2802 result = snd_pcm_lib_write(substream, buf, count);
2803 if (result > 0)
2804 result = frames_to_bytes(runtime, result);
2805 return result;
2806 }
2807
2808 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2809 unsigned long nr_segs, loff_t pos)
2810
2811 {
2812 struct snd_pcm_file *pcm_file;
2813 struct snd_pcm_substream *substream;
2814 struct snd_pcm_runtime *runtime;
2815 snd_pcm_sframes_t result;
2816 unsigned long i;
2817 void __user **bufs;
2818 snd_pcm_uframes_t frames;
2819
2820 pcm_file = iocb->ki_filp->private_data;
2821 substream = pcm_file->substream;
2822 if (PCM_RUNTIME_CHECK(substream))
2823 return -ENXIO;
2824 runtime = substream->runtime;
2825 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2826 return -EBADFD;
2827 if (nr_segs > 1024 || nr_segs != runtime->channels)
2828 return -EINVAL;
2829 if (!frame_aligned(runtime, iov->iov_len))
2830 return -EINVAL;
2831 frames = bytes_to_samples(runtime, iov->iov_len);
2832 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2833 if (bufs == NULL)
2834 return -ENOMEM;
2835 for (i = 0; i < nr_segs; ++i)
2836 bufs[i] = iov[i].iov_base;
2837 result = snd_pcm_lib_readv(substream, bufs, frames);
2838 if (result > 0)
2839 result = frames_to_bytes(runtime, result);
2840 kfree(bufs);
2841 return result;
2842 }
2843
2844 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2845 unsigned long nr_segs, loff_t pos)
2846 {
2847 struct snd_pcm_file *pcm_file;
2848 struct snd_pcm_substream *substream;
2849 struct snd_pcm_runtime *runtime;
2850 snd_pcm_sframes_t result;
2851 unsigned long i;
2852 void __user **bufs;
2853 snd_pcm_uframes_t frames;
2854
2855 pcm_file = iocb->ki_filp->private_data;
2856 substream = pcm_file->substream;
2857 if (PCM_RUNTIME_CHECK(substream))
2858 return -ENXIO;
2859 runtime = substream->runtime;
2860 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2861 return -EBADFD;
2862 if (nr_segs > 128 || nr_segs != runtime->channels ||
2863 !frame_aligned(runtime, iov->iov_len))
2864 return -EINVAL;
2865 frames = bytes_to_samples(runtime, iov->iov_len);
2866 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2867 if (bufs == NULL)
2868 return -ENOMEM;
2869 for (i = 0; i < nr_segs; ++i)
2870 bufs[i] = iov[i].iov_base;
2871 result = snd_pcm_lib_writev(substream, bufs, frames);
2872 if (result > 0)
2873 result = frames_to_bytes(runtime, result);
2874 kfree(bufs);
2875 return result;
2876 }
2877
2878 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2879 {
2880 struct snd_pcm_file *pcm_file;
2881 struct snd_pcm_substream *substream;
2882 struct snd_pcm_runtime *runtime;
2883 unsigned int mask;
2884 snd_pcm_uframes_t avail;
2885
2886 pcm_file = file->private_data;
2887
2888 substream = pcm_file->substream;
2889 if (PCM_RUNTIME_CHECK(substream))
2890 return -ENXIO;
2891 runtime = substream->runtime;
2892
2893 poll_wait(file, &runtime->sleep, wait);
2894
2895 snd_pcm_stream_lock_irq(substream);
2896 avail = snd_pcm_playback_avail(runtime);
2897 switch (runtime->status->state) {
2898 case SNDRV_PCM_STATE_RUNNING:
2899 case SNDRV_PCM_STATE_PREPARED:
2900 case SNDRV_PCM_STATE_PAUSED:
2901 if (avail >= runtime->control->avail_min) {
2902 mask = POLLOUT | POLLWRNORM;
2903 break;
2904 }
2905 /* Fall through */
2906 case SNDRV_PCM_STATE_DRAINING:
2907 mask = 0;
2908 break;
2909 default:
2910 mask = POLLOUT | POLLWRNORM | POLLERR;
2911 break;
2912 }
2913 snd_pcm_stream_unlock_irq(substream);
2914 return mask;
2915 }
2916
2917 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2918 {
2919 struct snd_pcm_file *pcm_file;
2920 struct snd_pcm_substream *substream;
2921 struct snd_pcm_runtime *runtime;
2922 unsigned int mask;
2923 snd_pcm_uframes_t avail;
2924
2925 pcm_file = file->private_data;
2926
2927 substream = pcm_file->substream;
2928 if (PCM_RUNTIME_CHECK(substream))
2929 return -ENXIO;
2930 runtime = substream->runtime;
2931
2932 poll_wait(file, &runtime->sleep, wait);
2933
2934 snd_pcm_stream_lock_irq(substream);
2935 avail = snd_pcm_capture_avail(runtime);
2936 switch (runtime->status->state) {
2937 case SNDRV_PCM_STATE_RUNNING:
2938 case SNDRV_PCM_STATE_PREPARED:
2939 case SNDRV_PCM_STATE_PAUSED:
2940 if (avail >= runtime->control->avail_min) {
2941 mask = POLLIN | POLLRDNORM;
2942 break;
2943 }
2944 mask = 0;
2945 break;
2946 case SNDRV_PCM_STATE_DRAINING:
2947 if (avail > 0) {
2948 mask = POLLIN | POLLRDNORM;
2949 break;
2950 }
2951 /* Fall through */
2952 default:
2953 mask = POLLIN | POLLRDNORM | POLLERR;
2954 break;
2955 }
2956 snd_pcm_stream_unlock_irq(substream);
2957 return mask;
2958 }
2959
2960 /*
2961 * mmap support
2962 */
2963
2964 /*
2965 * Only on coherent architectures, we can mmap the status and the control records
2966 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
2967 */
2968 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
2969 /*
2970 * mmap status record
2971 */
2972 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
2973 struct vm_fault *vmf)
2974 {
2975 struct snd_pcm_substream *substream = area->vm_private_data;
2976 struct snd_pcm_runtime *runtime;
2977
2978 if (substream == NULL)
2979 return VM_FAULT_SIGBUS;
2980 runtime = substream->runtime;
2981 vmf->page = virt_to_page(runtime->status);
2982 get_page(vmf->page);
2983 return 0;
2984 }
2985
2986 static struct vm_operations_struct snd_pcm_vm_ops_status =
2987 {
2988 .fault = snd_pcm_mmap_status_fault,
2989 };
2990
2991 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
2992 struct vm_area_struct *area)
2993 {
2994 struct snd_pcm_runtime *runtime;
2995 long size;
2996 if (!(area->vm_flags & VM_READ))
2997 return -EINVAL;
2998 runtime = substream->runtime;
2999 size = area->vm_end - area->vm_start;
3000 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3001 return -EINVAL;
3002 area->vm_ops = &snd_pcm_vm_ops_status;
3003 area->vm_private_data = substream;
3004 area->vm_flags |= VM_RESERVED;
3005 return 0;
3006 }
3007
3008 /*
3009 * mmap control record
3010 */
3011 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3012 struct vm_fault *vmf)
3013 {
3014 struct snd_pcm_substream *substream = area->vm_private_data;
3015 struct snd_pcm_runtime *runtime;
3016
3017 if (substream == NULL)
3018 return VM_FAULT_SIGBUS;
3019 runtime = substream->runtime;
3020 vmf->page = virt_to_page(runtime->control);
3021 get_page(vmf->page);
3022 return 0;
3023 }
3024
3025 static struct vm_operations_struct snd_pcm_vm_ops_control =
3026 {
3027 .fault = snd_pcm_mmap_control_fault,
3028 };
3029
3030 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3031 struct vm_area_struct *area)
3032 {
3033 struct snd_pcm_runtime *runtime;
3034 long size;
3035 if (!(area->vm_flags & VM_READ))
3036 return -EINVAL;
3037 runtime = substream->runtime;
3038 size = area->vm_end - area->vm_start;
3039 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3040 return -EINVAL;
3041 area->vm_ops = &snd_pcm_vm_ops_control;
3042 area->vm_private_data = substream;
3043 area->vm_flags |= VM_RESERVED;
3044 return 0;
3045 }
3046 #else /* ! coherent mmap */
3047 /*
3048 * don't support mmap for status and control records.
3049 */
3050 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3051 struct vm_area_struct *area)
3052 {
3053 return -ENXIO;
3054 }
3055 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3056 struct vm_area_struct *area)
3057 {
3058 return -ENXIO;
3059 }
3060 #endif /* coherent mmap */
3061
3062 /*
3063 * fault callback for mmapping a RAM page
3064 */
3065 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3066 struct vm_fault *vmf)
3067 {
3068 struct snd_pcm_substream *substream = area->vm_private_data;
3069 struct snd_pcm_runtime *runtime;
3070 unsigned long offset;
3071 struct page * page;
3072 void *vaddr;
3073 size_t dma_bytes;
3074
3075 if (substream == NULL)
3076 return VM_FAULT_SIGBUS;
3077 runtime = substream->runtime;
3078 offset = vmf->pgoff << PAGE_SHIFT;
3079 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3080 if (offset > dma_bytes - PAGE_SIZE)
3081 return VM_FAULT_SIGBUS;
3082 if (substream->ops->page) {
3083 page = substream->ops->page(substream, offset);
3084 if (!page)
3085 return VM_FAULT_SIGBUS;
3086 } else {
3087 vaddr = runtime->dma_area + offset;
3088 page = virt_to_page(vaddr);
3089 }
3090 get_page(page);
3091 vmf->page = page;
3092 return 0;
3093 }
3094
3095 static struct vm_operations_struct snd_pcm_vm_ops_data =
3096 {
3097 .open = snd_pcm_mmap_data_open,
3098 .close = snd_pcm_mmap_data_close,
3099 .fault = snd_pcm_mmap_data_fault,
3100 };
3101
3102 /*
3103 * mmap the DMA buffer on RAM
3104 */
3105 static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
3106 struct vm_area_struct *area)
3107 {
3108 area->vm_ops = &snd_pcm_vm_ops_data;
3109 area->vm_private_data = substream;
3110 area->vm_flags |= VM_RESERVED;
3111 atomic_inc(&substream->mmap_count);
3112 return 0;
3113 }
3114
3115 /*
3116 * mmap the DMA buffer on I/O memory area
3117 */
3118 #if SNDRV_PCM_INFO_MMAP_IOMEM
3119 static struct vm_operations_struct snd_pcm_vm_ops_data_mmio =
3120 {
3121 .open = snd_pcm_mmap_data_open,
3122 .close = snd_pcm_mmap_data_close,
3123 };
3124
3125 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3126 struct vm_area_struct *area)
3127 {
3128 long size;
3129 unsigned long offset;
3130
3131 #ifdef pgprot_noncached
3132 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3133 #endif
3134 area->vm_ops = &snd_pcm_vm_ops_data_mmio;
3135 area->vm_private_data = substream;
3136 area->vm_flags |= VM_IO;
3137 size = area->vm_end - area->vm_start;
3138 offset = area->vm_pgoff << PAGE_SHIFT;
3139 if (io_remap_pfn_range(area, area->vm_start,
3140 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
3141 size, area->vm_page_prot))
3142 return -EAGAIN;
3143 atomic_inc(&substream->mmap_count);
3144 return 0;
3145 }
3146
3147 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3148 #endif /* SNDRV_PCM_INFO_MMAP */
3149
3150 /*
3151 * mmap DMA buffer
3152 */
3153 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3154 struct vm_area_struct *area)
3155 {
3156 struct snd_pcm_runtime *runtime;
3157 long size;
3158 unsigned long offset;
3159 size_t dma_bytes;
3160
3161 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3162 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3163 return -EINVAL;
3164 } else {
3165 if (!(area->vm_flags & VM_READ))
3166 return -EINVAL;
3167 }
3168 runtime = substream->runtime;
3169 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3170 return -EBADFD;
3171 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3172 return -ENXIO;
3173 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3174 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3175 return -EINVAL;
3176 size = area->vm_end - area->vm_start;
3177 offset = area->vm_pgoff << PAGE_SHIFT;
3178 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3179 if ((size_t)size > dma_bytes)
3180 return -EINVAL;
3181 if (offset > dma_bytes - size)
3182 return -EINVAL;
3183
3184 if (substream->ops->mmap)
3185 return substream->ops->mmap(substream, area);
3186 else
3187 return snd_pcm_default_mmap(substream, area);
3188 }
3189
3190 EXPORT_SYMBOL(snd_pcm_mmap_data);
3191
3192 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3193 {
3194 struct snd_pcm_file * pcm_file;
3195 struct snd_pcm_substream *substream;
3196 unsigned long offset;
3197
3198 pcm_file = file->private_data;
3199 substream = pcm_file->substream;
3200 if (PCM_RUNTIME_CHECK(substream))
3201 return -ENXIO;
3202
3203 offset = area->vm_pgoff << PAGE_SHIFT;
3204 switch (offset) {
3205 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3206 if (pcm_file->no_compat_mmap)
3207 return -ENXIO;
3208 return snd_pcm_mmap_status(substream, file, area);
3209 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3210 if (pcm_file->no_compat_mmap)
3211 return -ENXIO;
3212 return snd_pcm_mmap_control(substream, file, area);
3213 default:
3214 return snd_pcm_mmap_data(substream, file, area);
3215 }
3216 return 0;
3217 }
3218
3219 static int snd_pcm_fasync(int fd, struct file * file, int on)
3220 {
3221 struct snd_pcm_file * pcm_file;
3222 struct snd_pcm_substream *substream;
3223 struct snd_pcm_runtime *runtime;
3224 int err = -ENXIO;
3225
3226 lock_kernel();
3227 pcm_file = file->private_data;
3228 substream = pcm_file->substream;
3229 if (PCM_RUNTIME_CHECK(substream))
3230 goto out;
3231 runtime = substream->runtime;
3232 err = fasync_helper(fd, file, on, &runtime->fasync);
3233 out:
3234 unlock_kernel();
3235 return err;
3236 }
3237
3238 /*
3239 * ioctl32 compat
3240 */
3241 #ifdef CONFIG_COMPAT
3242 #include "pcm_compat.c"
3243 #else
3244 #define snd_pcm_ioctl_compat NULL
3245 #endif
3246
3247 /*
3248 * To be removed helpers to keep binary compatibility
3249 */
3250
3251 #ifdef CONFIG_SND_SUPPORT_OLD_API
3252 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3253 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3254
3255 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3256 struct snd_pcm_hw_params_old *oparams)
3257 {
3258 unsigned int i;
3259
3260 memset(params, 0, sizeof(*params));
3261 params->flags = oparams->flags;
3262 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3263 params->masks[i].bits[0] = oparams->masks[i];
3264 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3265 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3266 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3267 params->info = oparams->info;
3268 params->msbits = oparams->msbits;
3269 params->rate_num = oparams->rate_num;
3270 params->rate_den = oparams->rate_den;
3271 params->fifo_size = oparams->fifo_size;
3272 }
3273
3274 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3275 struct snd_pcm_hw_params *params)
3276 {
3277 unsigned int i;
3278
3279 memset(oparams, 0, sizeof(*oparams));
3280 oparams->flags = params->flags;
3281 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3282 oparams->masks[i] = params->masks[i].bits[0];
3283 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3284 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3285 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3286 oparams->info = params->info;
3287 oparams->msbits = params->msbits;
3288 oparams->rate_num = params->rate_num;
3289 oparams->rate_den = params->rate_den;
3290 oparams->fifo_size = params->fifo_size;
3291 }
3292
3293 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3294 struct snd_pcm_hw_params_old __user * _oparams)
3295 {
3296 struct snd_pcm_hw_params *params;
3297 struct snd_pcm_hw_params_old *oparams = NULL;
3298 int err;
3299
3300 params = kmalloc(sizeof(*params), GFP_KERNEL);
3301 if (!params)
3302 return -ENOMEM;
3303
3304 oparams = memdup_user(_oparams, sizeof(*oparams));
3305 if (IS_ERR(oparams)) {
3306 err = PTR_ERR(oparams);
3307 goto out;
3308 }
3309 snd_pcm_hw_convert_from_old_params(params, oparams);
3310 err = snd_pcm_hw_refine(substream, params);
3311 snd_pcm_hw_convert_to_old_params(oparams, params);
3312 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3313 if (!err)
3314 err = -EFAULT;
3315 }
3316
3317 kfree(oparams);
3318 out:
3319 kfree(params);
3320 return err;
3321 }
3322
3323 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3324 struct snd_pcm_hw_params_old __user * _oparams)
3325 {
3326 struct snd_pcm_hw_params *params;
3327 struct snd_pcm_hw_params_old *oparams = NULL;
3328 int err;
3329
3330 params = kmalloc(sizeof(*params), GFP_KERNEL);
3331 if (!params)
3332 return -ENOMEM;
3333
3334 oparams = memdup_user(_oparams, sizeof(*oparams));
3335 if (IS_ERR(oparams)) {
3336 err = PTR_ERR(oparams);
3337 goto out;
3338 }
3339 snd_pcm_hw_convert_from_old_params(params, oparams);
3340 err = snd_pcm_hw_params(substream, params);
3341 snd_pcm_hw_convert_to_old_params(oparams, params);
3342 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3343 if (!err)
3344 err = -EFAULT;
3345 }
3346
3347 kfree(oparams);
3348 out:
3349 kfree(params);
3350 return err;
3351 }
3352 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3353
3354 #ifndef CONFIG_MMU
3355 unsigned long dummy_get_unmapped_area(struct file *file, unsigned long addr,
3356 unsigned long len, unsigned long pgoff,
3357 unsigned long flags)
3358 {
3359 return 0;
3360 }
3361 #else
3362 # define dummy_get_unmapped_area NULL
3363 #endif
3364
3365 /*
3366 * Register section
3367 */
3368
3369 const struct file_operations snd_pcm_f_ops[2] = {
3370 {
3371 .owner = THIS_MODULE,
3372 .write = snd_pcm_write,
3373 .aio_write = snd_pcm_aio_write,
3374 .open = snd_pcm_playback_open,
3375 .release = snd_pcm_release,
3376 .poll = snd_pcm_playback_poll,
3377 .unlocked_ioctl = snd_pcm_playback_ioctl,
3378 .compat_ioctl = snd_pcm_ioctl_compat,
3379 .mmap = snd_pcm_mmap,
3380 .fasync = snd_pcm_fasync,
3381 .get_unmapped_area = dummy_get_unmapped_area,
3382 },
3383 {
3384 .owner = THIS_MODULE,
3385 .read = snd_pcm_read,
3386 .aio_read = snd_pcm_aio_read,
3387 .open = snd_pcm_capture_open,
3388 .release = snd_pcm_release,
3389 .poll = snd_pcm_capture_poll,
3390 .unlocked_ioctl = snd_pcm_capture_ioctl,
3391 .compat_ioctl = snd_pcm_ioctl_compat,
3392 .mmap = snd_pcm_mmap,
3393 .fasync = snd_pcm_fasync,
3394 .get_unmapped_area = dummy_get_unmapped_area,
3395 }
3396 };
Support for the Chinese Samsung S3C2440 based development boards