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sound: Use static const char * const where possible
[firewire-audio.git] / sound / core / pcm_native.c
blobeb4094270a4fcceb4a4cb4ead4740101df70c09f
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 <linux/dma-mapping.h>
30 #include <sound/core.h>
31 #include <sound/control.h>
32 #include <sound/info.h>
33 #include <sound/pcm.h>
34 #include <sound/pcm_params.h>
35 #include <sound/timer.h>
36 #include <sound/minors.h>
37 #include <asm/io.h>
38 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
39 #include <dma-coherence.h>
40 #endif
41
42 /*
43 * Compatibility
44 */
45
46 struct snd_pcm_hw_params_old {
47 unsigned int flags;
48 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
49 SNDRV_PCM_HW_PARAM_ACCESS + 1];
50 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
51 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
52 unsigned int rmask;
53 unsigned int cmask;
54 unsigned int info;
55 unsigned int msbits;
56 unsigned int rate_num;
57 unsigned int rate_den;
58 snd_pcm_uframes_t fifo_size;
59 unsigned char reserved[64];
60 };
61
62 #ifdef CONFIG_SND_SUPPORT_OLD_API
63 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
64 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
65
66 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
67 struct snd_pcm_hw_params_old __user * _oparams);
68 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
69 struct snd_pcm_hw_params_old __user * _oparams);
70 #endif
71 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
72
73 /*
74 *
75 */
76
77 DEFINE_RWLOCK(snd_pcm_link_rwlock);
78 EXPORT_SYMBOL(snd_pcm_link_rwlock);
79
80 static DECLARE_RWSEM(snd_pcm_link_rwsem);
81
82 static inline mm_segment_t snd_enter_user(void)
83 {
84 mm_segment_t fs = get_fs();
85 set_fs(get_ds());
86 return fs;
87 }
88
89 static inline void snd_leave_user(mm_segment_t fs)
90 {
91 set_fs(fs);
92 }
93
94
95
96 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
97 {
98 struct snd_pcm_runtime *runtime;
99 struct snd_pcm *pcm = substream->pcm;
100 struct snd_pcm_str *pstr = substream->pstr;
101
102 memset(info, 0, sizeof(*info));
103 info->card = pcm->card->number;
104 info->device = pcm->device;
105 info->stream = substream->stream;
106 info->subdevice = substream->number;
107 strlcpy(info->id, pcm->id, sizeof(info->id));
108 strlcpy(info->name, pcm->name, sizeof(info->name));
109 info->dev_class = pcm->dev_class;
110 info->dev_subclass = pcm->dev_subclass;
111 info->subdevices_count = pstr->substream_count;
112 info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
113 strlcpy(info->subname, substream->name, sizeof(info->subname));
114 runtime = substream->runtime;
115 /* AB: FIXME!!! This is definitely nonsense */
116 if (runtime) {
117 info->sync = runtime->sync;
118 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
119 }
120 return 0;
121 }
122
123 int snd_pcm_info_user(struct snd_pcm_substream *substream,
124 struct snd_pcm_info __user * _info)
125 {
126 struct snd_pcm_info *info;
127 int err;
128
129 info = kmalloc(sizeof(*info), GFP_KERNEL);
130 if (! info)
131 return -ENOMEM;
132 err = snd_pcm_info(substream, info);
133 if (err >= 0) {
134 if (copy_to_user(_info, info, sizeof(*info)))
135 err = -EFAULT;
136 }
137 kfree(info);
138 return err;
139 }
140
141 #undef RULES_DEBUG
142
143 #ifdef RULES_DEBUG
144 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
145 static const char * const snd_pcm_hw_param_names[] = {
146 HW_PARAM(ACCESS),
147 HW_PARAM(FORMAT),
148 HW_PARAM(SUBFORMAT),
149 HW_PARAM(SAMPLE_BITS),
150 HW_PARAM(FRAME_BITS),
151 HW_PARAM(CHANNELS),
152 HW_PARAM(RATE),
153 HW_PARAM(PERIOD_TIME),
154 HW_PARAM(PERIOD_SIZE),
155 HW_PARAM(PERIOD_BYTES),
156 HW_PARAM(PERIODS),
157 HW_PARAM(BUFFER_TIME),
158 HW_PARAM(BUFFER_SIZE),
159 HW_PARAM(BUFFER_BYTES),
160 HW_PARAM(TICK_TIME),
161 };
162 #endif
163
164 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
165 struct snd_pcm_hw_params *params)
166 {
167 unsigned int k;
168 struct snd_pcm_hardware *hw;
169 struct snd_interval *i = NULL;
170 struct snd_mask *m = NULL;
171 struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
172 unsigned int rstamps[constrs->rules_num];
173 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
174 unsigned int stamp = 2;
175 int changed, again;
176
177 params->info = 0;
178 params->fifo_size = 0;
179 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
180 params->msbits = 0;
181 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
182 params->rate_num = 0;
183 params->rate_den = 0;
184 }
185
186 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
187 m = hw_param_mask(params, k);
188 if (snd_mask_empty(m))
189 return -EINVAL;
190 if (!(params->rmask & (1 << k)))
191 continue;
192 #ifdef RULES_DEBUG
193 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
194 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
195 #endif
196 changed = snd_mask_refine(m, constrs_mask(constrs, k));
197 #ifdef RULES_DEBUG
198 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
199 #endif
200 if (changed)
201 params->cmask |= 1 << k;
202 if (changed < 0)
203 return changed;
204 }
205
206 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
207 i = hw_param_interval(params, k);
208 if (snd_interval_empty(i))
209 return -EINVAL;
210 if (!(params->rmask & (1 << k)))
211 continue;
212 #ifdef RULES_DEBUG
213 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
214 if (i->empty)
215 printk("empty");
216 else
217 printk("%c%u %u%c",
218 i->openmin ? '(' : '[', i->min,
219 i->max, i->openmax ? ')' : ']');
220 printk(" -> ");
221 #endif
222 changed = snd_interval_refine(i, constrs_interval(constrs, k));
223 #ifdef RULES_DEBUG
224 if (i->empty)
225 printk("empty\n");
226 else
227 printk("%c%u %u%c\n",
228 i->openmin ? '(' : '[', i->min,
229 i->max, i->openmax ? ')' : ']');
230 #endif
231 if (changed)
232 params->cmask |= 1 << k;
233 if (changed < 0)
234 return changed;
235 }
236
237 for (k = 0; k < constrs->rules_num; k++)
238 rstamps[k] = 0;
239 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
240 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
241 do {
242 again = 0;
243 for (k = 0; k < constrs->rules_num; k++) {
244 struct snd_pcm_hw_rule *r = &constrs->rules[k];
245 unsigned int d;
246 int doit = 0;
247 if (r->cond && !(r->cond & params->flags))
248 continue;
249 for (d = 0; r->deps[d] >= 0; d++) {
250 if (vstamps[r->deps[d]] > rstamps[k]) {
251 doit = 1;
252 break;
253 }
254 }
255 if (!doit)
256 continue;
257 #ifdef RULES_DEBUG
258 printk(KERN_DEBUG "Rule %d [%p]: ", k, r->func);
259 if (r->var >= 0) {
260 printk("%s = ", snd_pcm_hw_param_names[r->var]);
261 if (hw_is_mask(r->var)) {
262 m = hw_param_mask(params, r->var);
263 printk("%x", *m->bits);
264 } else {
265 i = hw_param_interval(params, r->var);
266 if (i->empty)
267 printk("empty");
268 else
269 printk("%c%u %u%c",
270 i->openmin ? '(' : '[', i->min,
271 i->max, i->openmax ? ')' : ']');
272 }
273 }
274 #endif
275 changed = r->func(params, r);
276 #ifdef RULES_DEBUG
277 if (r->var >= 0) {
278 printk(" -> ");
279 if (hw_is_mask(r->var))
280 printk("%x", *m->bits);
281 else {
282 if (i->empty)
283 printk("empty");
284 else
285 printk("%c%u %u%c",
286 i->openmin ? '(' : '[', i->min,
287 i->max, i->openmax ? ')' : ']');
288 }
289 }
290 printk("\n");
291 #endif
292 rstamps[k] = stamp;
293 if (changed && r->var >= 0) {
294 params->cmask |= (1 << r->var);
295 vstamps[r->var] = stamp;
296 again = 1;
297 }
298 if (changed < 0)
299 return changed;
300 stamp++;
301 }
302 } while (again);
303 if (!params->msbits) {
304 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
305 if (snd_interval_single(i))
306 params->msbits = snd_interval_value(i);
307 }
308
309 if (!params->rate_den) {
310 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
311 if (snd_interval_single(i)) {
312 params->rate_num = snd_interval_value(i);
313 params->rate_den = 1;
314 }
315 }
316
317 hw = &substream->runtime->hw;
318 if (!params->info)
319 params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
320 if (!params->fifo_size) {
321 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
322 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
323 if (snd_mask_min(m) == snd_mask_max(m) &&
324 snd_interval_min(i) == snd_interval_max(i)) {
325 changed = substream->ops->ioctl(substream,
326 SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
327 if (changed < 0)
328 return changed;
329 }
330 }
331 params->rmask = 0;
332 return 0;
333 }
334
335 EXPORT_SYMBOL(snd_pcm_hw_refine);
336
337 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
338 struct snd_pcm_hw_params __user * _params)
339 {
340 struct snd_pcm_hw_params *params;
341 int err;
342
343 params = memdup_user(_params, sizeof(*params));
344 if (IS_ERR(params))
345 return PTR_ERR(params);
346
347 err = snd_pcm_hw_refine(substream, params);
348 if (copy_to_user(_params, params, sizeof(*params))) {
349 if (!err)
350 err = -EFAULT;
351 }
352
353 kfree(params);
354 return err;
355 }
356
357 static int period_to_usecs(struct snd_pcm_runtime *runtime)
358 {
359 int usecs;
360
361 if (! runtime->rate)
362 return -1; /* invalid */
363
364 /* take 75% of period time as the deadline */
365 usecs = (750000 / runtime->rate) * runtime->period_size;
366 usecs += ((750000 % runtime->rate) * runtime->period_size) /
367 runtime->rate;
368
369 return usecs;
370 }
371
372 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
373 struct snd_pcm_hw_params *params)
374 {
375 struct snd_pcm_runtime *runtime;
376 int err, usecs;
377 unsigned int bits;
378 snd_pcm_uframes_t frames;
379
380 if (PCM_RUNTIME_CHECK(substream))
381 return -ENXIO;
382 runtime = substream->runtime;
383 snd_pcm_stream_lock_irq(substream);
384 switch (runtime->status->state) {
385 case SNDRV_PCM_STATE_OPEN:
386 case SNDRV_PCM_STATE_SETUP:
387 case SNDRV_PCM_STATE_PREPARED:
388 break;
389 default:
390 snd_pcm_stream_unlock_irq(substream);
391 return -EBADFD;
392 }
393 snd_pcm_stream_unlock_irq(substream);
394 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
395 if (!substream->oss.oss)
396 #endif
397 if (atomic_read(&substream->mmap_count))
398 return -EBADFD;
399
400 params->rmask = ~0U;
401 err = snd_pcm_hw_refine(substream, params);
402 if (err < 0)
403 goto _error;
404
405 err = snd_pcm_hw_params_choose(substream, params);
406 if (err < 0)
407 goto _error;
408
409 if (substream->ops->hw_params != NULL) {
410 err = substream->ops->hw_params(substream, params);
411 if (err < 0)
412 goto _error;
413 }
414
415 runtime->access = params_access(params);
416 runtime->format = params_format(params);
417 runtime->subformat = params_subformat(params);
418 runtime->channels = params_channels(params);
419 runtime->rate = params_rate(params);
420 runtime->period_size = params_period_size(params);
421 runtime->periods = params_periods(params);
422 runtime->buffer_size = params_buffer_size(params);
423 runtime->info = params->info;
424 runtime->rate_num = params->rate_num;
425 runtime->rate_den = params->rate_den;
426
427 bits = snd_pcm_format_physical_width(runtime->format);
428 runtime->sample_bits = bits;
429 bits *= runtime->channels;
430 runtime->frame_bits = bits;
431 frames = 1;
432 while (bits % 8 != 0) {
433 bits *= 2;
434 frames *= 2;
435 }
436 runtime->byte_align = bits / 8;
437 runtime->min_align = frames;
438
439 /* Default sw params */
440 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
441 runtime->period_step = 1;
442 runtime->control->avail_min = runtime->period_size;
443 runtime->start_threshold = 1;
444 runtime->stop_threshold = runtime->buffer_size;
445 runtime->silence_threshold = 0;
446 runtime->silence_size = 0;
447 runtime->boundary = runtime->buffer_size;
448 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
449 runtime->boundary *= 2;
450
451 snd_pcm_timer_resolution_change(substream);
452 runtime->status->state = SNDRV_PCM_STATE_SETUP;
453
454 if (pm_qos_request_active(&substream->latency_pm_qos_req))
455 pm_qos_remove_request(&substream->latency_pm_qos_req);
456 if ((usecs = period_to_usecs(runtime)) >= 0)
457 pm_qos_add_request(&substream->latency_pm_qos_req,
458 PM_QOS_CPU_DMA_LATENCY, usecs);
459 return 0;
460 _error:
461 /* hardware might be unuseable from this time,
462 so we force application to retry to set
463 the correct hardware parameter settings */
464 runtime->status->state = SNDRV_PCM_STATE_OPEN;
465 if (substream->ops->hw_free != NULL)
466 substream->ops->hw_free(substream);
467 return err;
468 }
469
470 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
471 struct snd_pcm_hw_params __user * _params)
472 {
473 struct snd_pcm_hw_params *params;
474 int err;
475
476 params = memdup_user(_params, sizeof(*params));
477 if (IS_ERR(params))
478 return PTR_ERR(params);
479
480 err = snd_pcm_hw_params(substream, params);
481 if (copy_to_user(_params, params, sizeof(*params))) {
482 if (!err)
483 err = -EFAULT;
484 }
485
486 kfree(params);
487 return err;
488 }
489
490 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
491 {
492 struct snd_pcm_runtime *runtime;
493 int result = 0;
494
495 if (PCM_RUNTIME_CHECK(substream))
496 return -ENXIO;
497 runtime = substream->runtime;
498 snd_pcm_stream_lock_irq(substream);
499 switch (runtime->status->state) {
500 case SNDRV_PCM_STATE_SETUP:
501 case SNDRV_PCM_STATE_PREPARED:
502 break;
503 default:
504 snd_pcm_stream_unlock_irq(substream);
505 return -EBADFD;
506 }
507 snd_pcm_stream_unlock_irq(substream);
508 if (atomic_read(&substream->mmap_count))
509 return -EBADFD;
510 if (substream->ops->hw_free)
511 result = substream->ops->hw_free(substream);
512 runtime->status->state = SNDRV_PCM_STATE_OPEN;
513 pm_qos_remove_request(&substream->latency_pm_qos_req);
514 return result;
515 }
516
517 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
518 struct snd_pcm_sw_params *params)
519 {
520 struct snd_pcm_runtime *runtime;
521 int err;
522
523 if (PCM_RUNTIME_CHECK(substream))
524 return -ENXIO;
525 runtime = substream->runtime;
526 snd_pcm_stream_lock_irq(substream);
527 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
528 snd_pcm_stream_unlock_irq(substream);
529 return -EBADFD;
530 }
531 snd_pcm_stream_unlock_irq(substream);
532
533 if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
534 return -EINVAL;
535 if (params->avail_min == 0)
536 return -EINVAL;
537 if (params->silence_size >= runtime->boundary) {
538 if (params->silence_threshold != 0)
539 return -EINVAL;
540 } else {
541 if (params->silence_size > params->silence_threshold)
542 return -EINVAL;
543 if (params->silence_threshold > runtime->buffer_size)
544 return -EINVAL;
545 }
546 err = 0;
547 snd_pcm_stream_lock_irq(substream);
548 runtime->tstamp_mode = params->tstamp_mode;
549 runtime->period_step = params->period_step;
550 runtime->control->avail_min = params->avail_min;
551 runtime->start_threshold = params->start_threshold;
552 runtime->stop_threshold = params->stop_threshold;
553 runtime->silence_threshold = params->silence_threshold;
554 runtime->silence_size = params->silence_size;
555 params->boundary = runtime->boundary;
556 if (snd_pcm_running(substream)) {
557 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
558 runtime->silence_size > 0)
559 snd_pcm_playback_silence(substream, ULONG_MAX);
560 err = snd_pcm_update_state(substream, runtime);
561 }
562 snd_pcm_stream_unlock_irq(substream);
563 return err;
564 }
565
566 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
567 struct snd_pcm_sw_params __user * _params)
568 {
569 struct snd_pcm_sw_params params;
570 int err;
571 if (copy_from_user(&params, _params, sizeof(params)))
572 return -EFAULT;
573 err = snd_pcm_sw_params(substream, &params);
574 if (copy_to_user(_params, &params, sizeof(params)))
575 return -EFAULT;
576 return err;
577 }
578
579 int snd_pcm_status(struct snd_pcm_substream *substream,
580 struct snd_pcm_status *status)
581 {
582 struct snd_pcm_runtime *runtime = substream->runtime;
583
584 snd_pcm_stream_lock_irq(substream);
585 status->state = runtime->status->state;
586 status->suspended_state = runtime->status->suspended_state;
587 if (status->state == SNDRV_PCM_STATE_OPEN)
588 goto _end;
589 status->trigger_tstamp = runtime->trigger_tstamp;
590 if (snd_pcm_running(substream)) {
591 snd_pcm_update_hw_ptr(substream);
592 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
593 status->tstamp = runtime->status->tstamp;
594 goto _tstamp_end;
595 }
596 }
597 snd_pcm_gettime(runtime, &status->tstamp);
598 _tstamp_end:
599 status->appl_ptr = runtime->control->appl_ptr;
600 status->hw_ptr = runtime->status->hw_ptr;
601 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
602 status->avail = snd_pcm_playback_avail(runtime);
603 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
604 runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
605 status->delay = runtime->buffer_size - status->avail;
606 status->delay += runtime->delay;
607 } else
608 status->delay = 0;
609 } else {
610 status->avail = snd_pcm_capture_avail(runtime);
611 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
612 status->delay = status->avail + runtime->delay;
613 else
614 status->delay = 0;
615 }
616 status->avail_max = runtime->avail_max;
617 status->overrange = runtime->overrange;
618 runtime->avail_max = 0;
619 runtime->overrange = 0;
620 _end:
621 snd_pcm_stream_unlock_irq(substream);
622 return 0;
623 }
624
625 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
626 struct snd_pcm_status __user * _status)
627 {
628 struct snd_pcm_status status;
629 int res;
630
631 memset(&status, 0, sizeof(status));
632 res = snd_pcm_status(substream, &status);
633 if (res < 0)
634 return res;
635 if (copy_to_user(_status, &status, sizeof(status)))
636 return -EFAULT;
637 return 0;
638 }
639
640 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
641 struct snd_pcm_channel_info * info)
642 {
643 struct snd_pcm_runtime *runtime;
644 unsigned int channel;
645
646 channel = info->channel;
647 runtime = substream->runtime;
648 snd_pcm_stream_lock_irq(substream);
649 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
650 snd_pcm_stream_unlock_irq(substream);
651 return -EBADFD;
652 }
653 snd_pcm_stream_unlock_irq(substream);
654 if (channel >= runtime->channels)
655 return -EINVAL;
656 memset(info, 0, sizeof(*info));
657 info->channel = channel;
658 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
659 }
660
661 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
662 struct snd_pcm_channel_info __user * _info)
663 {
664 struct snd_pcm_channel_info info;
665 int res;
666
667 if (copy_from_user(&info, _info, sizeof(info)))
668 return -EFAULT;
669 res = snd_pcm_channel_info(substream, &info);
670 if (res < 0)
671 return res;
672 if (copy_to_user(_info, &info, sizeof(info)))
673 return -EFAULT;
674 return 0;
675 }
676
677 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
678 {
679 struct snd_pcm_runtime *runtime = substream->runtime;
680 if (runtime->trigger_master == NULL)
681 return;
682 if (runtime->trigger_master == substream) {
683 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
684 } else {
685 snd_pcm_trigger_tstamp(runtime->trigger_master);
686 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
687 }
688 runtime->trigger_master = NULL;
689 }
690
691 struct action_ops {
692 int (*pre_action)(struct snd_pcm_substream *substream, int state);
693 int (*do_action)(struct snd_pcm_substream *substream, int state);
694 void (*undo_action)(struct snd_pcm_substream *substream, int state);
695 void (*post_action)(struct snd_pcm_substream *substream, int state);
696 };
697
698 /*
699 * this functions is core for handling of linked stream
700 * Note: the stream state might be changed also on failure
701 * Note2: call with calling stream lock + link lock
702 */
703 static int snd_pcm_action_group(struct action_ops *ops,
704 struct snd_pcm_substream *substream,
705 int state, int do_lock)
706 {
707 struct snd_pcm_substream *s = NULL;
708 struct snd_pcm_substream *s1;
709 int res = 0;
710
711 snd_pcm_group_for_each_entry(s, substream) {
712 if (do_lock && s != substream)
713 spin_lock_nested(&s->self_group.lock,
714 SINGLE_DEPTH_NESTING);
715 res = ops->pre_action(s, state);
716 if (res < 0)
717 goto _unlock;
718 }
719 snd_pcm_group_for_each_entry(s, substream) {
720 res = ops->do_action(s, state);
721 if (res < 0) {
722 if (ops->undo_action) {
723 snd_pcm_group_for_each_entry(s1, substream) {
724 if (s1 == s) /* failed stream */
725 break;
726 ops->undo_action(s1, state);
727 }
728 }
729 s = NULL; /* unlock all */
730 goto _unlock;
731 }
732 }
733 snd_pcm_group_for_each_entry(s, substream) {
734 ops->post_action(s, state);
735 }
736 _unlock:
737 if (do_lock) {
738 /* unlock streams */
739 snd_pcm_group_for_each_entry(s1, substream) {
740 if (s1 != substream)
741 spin_unlock(&s1->self_group.lock);
742 if (s1 == s) /* end */
743 break;
744 }
745 }
746 return res;
747 }
748
749 /*
750 * Note: call with stream lock
751 */
752 static int snd_pcm_action_single(struct action_ops *ops,
753 struct snd_pcm_substream *substream,
754 int state)
755 {
756 int res;
757
758 res = ops->pre_action(substream, state);
759 if (res < 0)
760 return res;
761 res = ops->do_action(substream, state);
762 if (res == 0)
763 ops->post_action(substream, state);
764 else if (ops->undo_action)
765 ops->undo_action(substream, state);
766 return res;
767 }
768
769 /*
770 * Note: call with stream lock
771 */
772 static int snd_pcm_action(struct action_ops *ops,
773 struct snd_pcm_substream *substream,
774 int state)
775 {
776 int res;
777
778 if (snd_pcm_stream_linked(substream)) {
779 if (!spin_trylock(&substream->group->lock)) {
780 spin_unlock(&substream->self_group.lock);
781 spin_lock(&substream->group->lock);
782 spin_lock(&substream->self_group.lock);
783 }
784 res = snd_pcm_action_group(ops, substream, state, 1);
785 spin_unlock(&substream->group->lock);
786 } else {
787 res = snd_pcm_action_single(ops, substream, state);
788 }
789 return res;
790 }
791
792 /*
793 * Note: don't use any locks before
794 */
795 static int snd_pcm_action_lock_irq(struct action_ops *ops,
796 struct snd_pcm_substream *substream,
797 int state)
798 {
799 int res;
800
801 read_lock_irq(&snd_pcm_link_rwlock);
802 if (snd_pcm_stream_linked(substream)) {
803 spin_lock(&substream->group->lock);
804 spin_lock(&substream->self_group.lock);
805 res = snd_pcm_action_group(ops, substream, state, 1);
806 spin_unlock(&substream->self_group.lock);
807 spin_unlock(&substream->group->lock);
808 } else {
809 spin_lock(&substream->self_group.lock);
810 res = snd_pcm_action_single(ops, substream, state);
811 spin_unlock(&substream->self_group.lock);
812 }
813 read_unlock_irq(&snd_pcm_link_rwlock);
814 return res;
815 }
816
817 /*
818 */
819 static int snd_pcm_action_nonatomic(struct action_ops *ops,
820 struct snd_pcm_substream *substream,
821 int state)
822 {
823 int res;
824
825 down_read(&snd_pcm_link_rwsem);
826 if (snd_pcm_stream_linked(substream))
827 res = snd_pcm_action_group(ops, substream, state, 0);
828 else
829 res = snd_pcm_action_single(ops, substream, state);
830 up_read(&snd_pcm_link_rwsem);
831 return res;
832 }
833
834 /*
835 * start callbacks
836 */
837 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
838 {
839 struct snd_pcm_runtime *runtime = substream->runtime;
840 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
841 return -EBADFD;
842 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
843 !snd_pcm_playback_data(substream))
844 return -EPIPE;
845 runtime->trigger_master = substream;
846 return 0;
847 }
848
849 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
850 {
851 if (substream->runtime->trigger_master != substream)
852 return 0;
853 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
854 }
855
856 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
857 {
858 if (substream->runtime->trigger_master == substream)
859 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
860 }
861
862 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
863 {
864 struct snd_pcm_runtime *runtime = substream->runtime;
865 snd_pcm_trigger_tstamp(substream);
866 runtime->hw_ptr_jiffies = jiffies;
867 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
868 runtime->rate;
869 runtime->status->state = state;
870 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
871 runtime->silence_size > 0)
872 snd_pcm_playback_silence(substream, ULONG_MAX);
873 if (substream->timer)
874 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
875 &runtime->trigger_tstamp);
876 }
877
878 static struct action_ops snd_pcm_action_start = {
879 .pre_action = snd_pcm_pre_start,
880 .do_action = snd_pcm_do_start,
881 .undo_action = snd_pcm_undo_start,
882 .post_action = snd_pcm_post_start
883 };
884
885 /**
886 * snd_pcm_start - start all linked streams
887 * @substream: the PCM substream instance
888 */
889 int snd_pcm_start(struct snd_pcm_substream *substream)
890 {
891 return snd_pcm_action(&snd_pcm_action_start, substream,
892 SNDRV_PCM_STATE_RUNNING);
893 }
894
895 /*
896 * stop callbacks
897 */
898 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
899 {
900 struct snd_pcm_runtime *runtime = substream->runtime;
901 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
902 return -EBADFD;
903 runtime->trigger_master = substream;
904 return 0;
905 }
906
907 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
908 {
909 if (substream->runtime->trigger_master == substream &&
910 snd_pcm_running(substream))
911 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
912 return 0; /* unconditonally stop all substreams */
913 }
914
915 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
916 {
917 struct snd_pcm_runtime *runtime = substream->runtime;
918 if (runtime->status->state != state) {
919 snd_pcm_trigger_tstamp(substream);
920 if (substream->timer)
921 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
922 &runtime->trigger_tstamp);
923 runtime->status->state = state;
924 }
925 wake_up(&runtime->sleep);
926 wake_up(&runtime->tsleep);
927 }
928
929 static struct action_ops snd_pcm_action_stop = {
930 .pre_action = snd_pcm_pre_stop,
931 .do_action = snd_pcm_do_stop,
932 .post_action = snd_pcm_post_stop
933 };
934
935 /**
936 * snd_pcm_stop - try to stop all running streams in the substream group
937 * @substream: the PCM substream instance
938 * @state: PCM state after stopping the stream
939 *
940 * The state of each stream is then changed to the given state unconditionally.
941 */
942 int snd_pcm_stop(struct snd_pcm_substream *substream, int state)
943 {
944 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
945 }
946
947 EXPORT_SYMBOL(snd_pcm_stop);
948
949 /**
950 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
951 * @substream: the PCM substream
952 *
953 * After stopping, the state is changed to SETUP.
954 * Unlike snd_pcm_stop(), this affects only the given stream.
955 */
956 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
957 {
958 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
959 SNDRV_PCM_STATE_SETUP);
960 }
961
962 /*
963 * pause callbacks
964 */
965 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
966 {
967 struct snd_pcm_runtime *runtime = substream->runtime;
968 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
969 return -ENOSYS;
970 if (push) {
971 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
972 return -EBADFD;
973 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
974 return -EBADFD;
975 runtime->trigger_master = substream;
976 return 0;
977 }
978
979 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
980 {
981 if (substream->runtime->trigger_master != substream)
982 return 0;
983 /* some drivers might use hw_ptr to recover from the pause -
984 update the hw_ptr now */
985 if (push)
986 snd_pcm_update_hw_ptr(substream);
987 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
988 * a delta betwen the current jiffies, this gives a large enough
989 * delta, effectively to skip the check once.
990 */
991 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
992 return substream->ops->trigger(substream,
993 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
994 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
995 }
996
997 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
998 {
999 if (substream->runtime->trigger_master == substream)
1000 substream->ops->trigger(substream,
1001 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1002 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1003 }
1004
1005 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1006 {
1007 struct snd_pcm_runtime *runtime = substream->runtime;
1008 snd_pcm_trigger_tstamp(substream);
1009 if (push) {
1010 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1011 if (substream->timer)
1012 snd_timer_notify(substream->timer,
1013 SNDRV_TIMER_EVENT_MPAUSE,
1014 &runtime->trigger_tstamp);
1015 wake_up(&runtime->sleep);
1016 wake_up(&runtime->tsleep);
1017 } else {
1018 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1019 if (substream->timer)
1020 snd_timer_notify(substream->timer,
1021 SNDRV_TIMER_EVENT_MCONTINUE,
1022 &runtime->trigger_tstamp);
1023 }
1024 }
1025
1026 static struct action_ops snd_pcm_action_pause = {
1027 .pre_action = snd_pcm_pre_pause,
1028 .do_action = snd_pcm_do_pause,
1029 .undo_action = snd_pcm_undo_pause,
1030 .post_action = snd_pcm_post_pause
1031 };
1032
1033 /*
1034 * Push/release the pause for all linked streams.
1035 */
1036 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1037 {
1038 return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1039 }
1040
1041 #ifdef CONFIG_PM
1042 /* suspend */
1043
1044 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1045 {
1046 struct snd_pcm_runtime *runtime = substream->runtime;
1047 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1048 return -EBUSY;
1049 runtime->trigger_master = substream;
1050 return 0;
1051 }
1052
1053 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1054 {
1055 struct snd_pcm_runtime *runtime = substream->runtime;
1056 if (runtime->trigger_master != substream)
1057 return 0;
1058 if (! snd_pcm_running(substream))
1059 return 0;
1060 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1061 return 0; /* suspend unconditionally */
1062 }
1063
1064 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1065 {
1066 struct snd_pcm_runtime *runtime = substream->runtime;
1067 snd_pcm_trigger_tstamp(substream);
1068 if (substream->timer)
1069 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1070 &runtime->trigger_tstamp);
1071 runtime->status->suspended_state = runtime->status->state;
1072 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1073 wake_up(&runtime->sleep);
1074 wake_up(&runtime->tsleep);
1075 }
1076
1077 static struct action_ops snd_pcm_action_suspend = {
1078 .pre_action = snd_pcm_pre_suspend,
1079 .do_action = snd_pcm_do_suspend,
1080 .post_action = snd_pcm_post_suspend
1081 };
1082
1083 /**
1084 * snd_pcm_suspend - trigger SUSPEND to all linked streams
1085 * @substream: the PCM substream
1086 *
1087 * After this call, all streams are changed to SUSPENDED state.
1088 */
1089 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1090 {
1091 int err;
1092 unsigned long flags;
1093
1094 if (! substream)
1095 return 0;
1096
1097 snd_pcm_stream_lock_irqsave(substream, flags);
1098 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1099 snd_pcm_stream_unlock_irqrestore(substream, flags);
1100 return err;
1101 }
1102
1103 EXPORT_SYMBOL(snd_pcm_suspend);
1104
1105 /**
1106 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1107 * @pcm: the PCM instance
1108 *
1109 * After this call, all streams are changed to SUSPENDED state.
1110 */
1111 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1112 {
1113 struct snd_pcm_substream *substream;
1114 int stream, err = 0;
1115
1116 if (! pcm)
1117 return 0;
1118
1119 for (stream = 0; stream < 2; stream++) {
1120 for (substream = pcm->streams[stream].substream;
1121 substream; substream = substream->next) {
1122 /* FIXME: the open/close code should lock this as well */
1123 if (substream->runtime == NULL)
1124 continue;
1125 err = snd_pcm_suspend(substream);
1126 if (err < 0 && err != -EBUSY)
1127 return err;
1128 }
1129 }
1130 return 0;
1131 }
1132
1133 EXPORT_SYMBOL(snd_pcm_suspend_all);
1134
1135 /* resume */
1136
1137 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1138 {
1139 struct snd_pcm_runtime *runtime = substream->runtime;
1140 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1141 return -ENOSYS;
1142 runtime->trigger_master = substream;
1143 return 0;
1144 }
1145
1146 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1147 {
1148 struct snd_pcm_runtime *runtime = substream->runtime;
1149 if (runtime->trigger_master != substream)
1150 return 0;
1151 /* DMA not running previously? */
1152 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1153 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1154 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1155 return 0;
1156 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1157 }
1158
1159 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1160 {
1161 if (substream->runtime->trigger_master == substream &&
1162 snd_pcm_running(substream))
1163 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1164 }
1165
1166 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1167 {
1168 struct snd_pcm_runtime *runtime = substream->runtime;
1169 snd_pcm_trigger_tstamp(substream);
1170 if (substream->timer)
1171 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1172 &runtime->trigger_tstamp);
1173 runtime->status->state = runtime->status->suspended_state;
1174 }
1175
1176 static struct action_ops snd_pcm_action_resume = {
1177 .pre_action = snd_pcm_pre_resume,
1178 .do_action = snd_pcm_do_resume,
1179 .undo_action = snd_pcm_undo_resume,
1180 .post_action = snd_pcm_post_resume
1181 };
1182
1183 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1184 {
1185 struct snd_card *card = substream->pcm->card;
1186 int res;
1187
1188 snd_power_lock(card);
1189 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1190 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1191 snd_power_unlock(card);
1192 return res;
1193 }
1194
1195 #else
1196
1197 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1198 {
1199 return -ENOSYS;
1200 }
1201
1202 #endif /* CONFIG_PM */
1203
1204 /*
1205 * xrun ioctl
1206 *
1207 * Change the RUNNING stream(s) to XRUN state.
1208 */
1209 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1210 {
1211 struct snd_card *card = substream->pcm->card;
1212 struct snd_pcm_runtime *runtime = substream->runtime;
1213 int result;
1214
1215 snd_power_lock(card);
1216 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1217 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1218 if (result < 0)
1219 goto _unlock;
1220 }
1221
1222 snd_pcm_stream_lock_irq(substream);
1223 switch (runtime->status->state) {
1224 case SNDRV_PCM_STATE_XRUN:
1225 result = 0; /* already there */
1226 break;
1227 case SNDRV_PCM_STATE_RUNNING:
1228 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1229 break;
1230 default:
1231 result = -EBADFD;
1232 }
1233 snd_pcm_stream_unlock_irq(substream);
1234 _unlock:
1235 snd_power_unlock(card);
1236 return result;
1237 }
1238
1239 /*
1240 * reset ioctl
1241 */
1242 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1243 {
1244 struct snd_pcm_runtime *runtime = substream->runtime;
1245 switch (runtime->status->state) {
1246 case SNDRV_PCM_STATE_RUNNING:
1247 case SNDRV_PCM_STATE_PREPARED:
1248 case SNDRV_PCM_STATE_PAUSED:
1249 case SNDRV_PCM_STATE_SUSPENDED:
1250 return 0;
1251 default:
1252 return -EBADFD;
1253 }
1254 }
1255
1256 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1257 {
1258 struct snd_pcm_runtime *runtime = substream->runtime;
1259 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1260 if (err < 0)
1261 return err;
1262 runtime->hw_ptr_base = 0;
1263 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1264 runtime->status->hw_ptr % runtime->period_size;
1265 runtime->silence_start = runtime->status->hw_ptr;
1266 runtime->silence_filled = 0;
1267 return 0;
1268 }
1269
1270 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1271 {
1272 struct snd_pcm_runtime *runtime = substream->runtime;
1273 runtime->control->appl_ptr = runtime->status->hw_ptr;
1274 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1275 runtime->silence_size > 0)
1276 snd_pcm_playback_silence(substream, ULONG_MAX);
1277 }
1278
1279 static struct action_ops snd_pcm_action_reset = {
1280 .pre_action = snd_pcm_pre_reset,
1281 .do_action = snd_pcm_do_reset,
1282 .post_action = snd_pcm_post_reset
1283 };
1284
1285 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1286 {
1287 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1288 }
1289
1290 /*
1291 * prepare ioctl
1292 */
1293 /* we use the second argument for updating f_flags */
1294 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1295 int f_flags)
1296 {
1297 struct snd_pcm_runtime *runtime = substream->runtime;
1298 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1299 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1300 return -EBADFD;
1301 if (snd_pcm_running(substream))
1302 return -EBUSY;
1303 substream->f_flags = f_flags;
1304 return 0;
1305 }
1306
1307 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1308 {
1309 int err;
1310 err = substream->ops->prepare(substream);
1311 if (err < 0)
1312 return err;
1313 return snd_pcm_do_reset(substream, 0);
1314 }
1315
1316 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1317 {
1318 struct snd_pcm_runtime *runtime = substream->runtime;
1319 runtime->control->appl_ptr = runtime->status->hw_ptr;
1320 runtime->status->state = SNDRV_PCM_STATE_PREPARED;
1321 }
1322
1323 static struct action_ops snd_pcm_action_prepare = {
1324 .pre_action = snd_pcm_pre_prepare,
1325 .do_action = snd_pcm_do_prepare,
1326 .post_action = snd_pcm_post_prepare
1327 };
1328
1329 /**
1330 * snd_pcm_prepare - prepare the PCM substream to be triggerable
1331 * @substream: the PCM substream instance
1332 * @file: file to refer f_flags
1333 */
1334 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1335 struct file *file)
1336 {
1337 int res;
1338 struct snd_card *card = substream->pcm->card;
1339 int f_flags;
1340
1341 if (file)
1342 f_flags = file->f_flags;
1343 else
1344 f_flags = substream->f_flags;
1345
1346 snd_power_lock(card);
1347 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1348 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1349 substream, f_flags);
1350 snd_power_unlock(card);
1351 return res;
1352 }
1353
1354 /*
1355 * drain ioctl
1356 */
1357
1358 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1359 {
1360 substream->runtime->trigger_master = substream;
1361 return 0;
1362 }
1363
1364 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1365 {
1366 struct snd_pcm_runtime *runtime = substream->runtime;
1367 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1368 switch (runtime->status->state) {
1369 case SNDRV_PCM_STATE_PREPARED:
1370 /* start playback stream if possible */
1371 if (! snd_pcm_playback_empty(substream)) {
1372 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1373 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1374 }
1375 break;
1376 case SNDRV_PCM_STATE_RUNNING:
1377 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1378 break;
1379 default:
1380 break;
1381 }
1382 } else {
1383 /* stop running stream */
1384 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1385 int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1386 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1387 snd_pcm_do_stop(substream, new_state);
1388 snd_pcm_post_stop(substream, new_state);
1389 }
1390 }
1391 return 0;
1392 }
1393
1394 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1395 {
1396 }
1397
1398 static struct action_ops snd_pcm_action_drain_init = {
1399 .pre_action = snd_pcm_pre_drain_init,
1400 .do_action = snd_pcm_do_drain_init,
1401 .post_action = snd_pcm_post_drain_init
1402 };
1403
1404 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1405
1406 /*
1407 * Drain the stream(s).
1408 * When the substream is linked, sync until the draining of all playback streams
1409 * is finished.
1410 * After this call, all streams are supposed to be either SETUP or DRAINING
1411 * (capture only) state.
1412 */
1413 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1414 struct file *file)
1415 {
1416 struct snd_card *card;
1417 struct snd_pcm_runtime *runtime;
1418 struct snd_pcm_substream *s;
1419 wait_queue_t wait;
1420 int result = 0;
1421 int nonblock = 0;
1422
1423 card = substream->pcm->card;
1424 runtime = substream->runtime;
1425
1426 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1427 return -EBADFD;
1428
1429 snd_power_lock(card);
1430 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1431 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1432 if (result < 0) {
1433 snd_power_unlock(card);
1434 return result;
1435 }
1436 }
1437
1438 if (file) {
1439 if (file->f_flags & O_NONBLOCK)
1440 nonblock = 1;
1441 } else if (substream->f_flags & O_NONBLOCK)
1442 nonblock = 1;
1443
1444 down_read(&snd_pcm_link_rwsem);
1445 snd_pcm_stream_lock_irq(substream);
1446 /* resume pause */
1447 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1448 snd_pcm_pause(substream, 0);
1449
1450 /* pre-start/stop - all running streams are changed to DRAINING state */
1451 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1452 if (result < 0)
1453 goto unlock;
1454 /* in non-blocking, we don't wait in ioctl but let caller poll */
1455 if (nonblock) {
1456 result = -EAGAIN;
1457 goto unlock;
1458 }
1459
1460 for (;;) {
1461 long tout;
1462 struct snd_pcm_runtime *to_check;
1463 if (signal_pending(current)) {
1464 result = -ERESTARTSYS;
1465 break;
1466 }
1467 /* find a substream to drain */
1468 to_check = NULL;
1469 snd_pcm_group_for_each_entry(s, substream) {
1470 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1471 continue;
1472 runtime = s->runtime;
1473 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1474 to_check = runtime;
1475 break;
1476 }
1477 }
1478 if (!to_check)
1479 break; /* all drained */
1480 init_waitqueue_entry(&wait, current);
1481 add_wait_queue(&to_check->sleep, &wait);
1482 set_current_state(TASK_INTERRUPTIBLE);
1483 snd_pcm_stream_unlock_irq(substream);
1484 up_read(&snd_pcm_link_rwsem);
1485 snd_power_unlock(card);
1486 tout = schedule_timeout(10 * HZ);
1487 snd_power_lock(card);
1488 down_read(&snd_pcm_link_rwsem);
1489 snd_pcm_stream_lock_irq(substream);
1490 remove_wait_queue(&to_check->sleep, &wait);
1491 if (tout == 0) {
1492 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1493 result = -ESTRPIPE;
1494 else {
1495 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1496 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1497 result = -EIO;
1498 }
1499 break;
1500 }
1501 }
1502
1503 unlock:
1504 snd_pcm_stream_unlock_irq(substream);
1505 up_read(&snd_pcm_link_rwsem);
1506 snd_power_unlock(card);
1507
1508 return result;
1509 }
1510
1511 /*
1512 * drop ioctl
1513 *
1514 * Immediately put all linked substreams into SETUP state.
1515 */
1516 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1517 {
1518 struct snd_pcm_runtime *runtime;
1519 struct snd_card *card;
1520 int result = 0;
1521
1522 if (PCM_RUNTIME_CHECK(substream))
1523 return -ENXIO;
1524 runtime = substream->runtime;
1525 card = substream->pcm->card;
1526
1527 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1528 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1529 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1530 return -EBADFD;
1531
1532 snd_pcm_stream_lock_irq(substream);
1533 /* resume pause */
1534 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1535 snd_pcm_pause(substream, 0);
1536
1537 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1538 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1539 snd_pcm_stream_unlock_irq(substream);
1540
1541 return result;
1542 }
1543
1544
1545 /* WARNING: Don't forget to fput back the file */
1546 static struct file *snd_pcm_file_fd(int fd)
1547 {
1548 struct file *file;
1549 struct inode *inode;
1550 unsigned int minor;
1551
1552 file = fget(fd);
1553 if (!file)
1554 return NULL;
1555 inode = file->f_path.dentry->d_inode;
1556 if (!S_ISCHR(inode->i_mode) ||
1557 imajor(inode) != snd_major) {
1558 fput(file);
1559 return NULL;
1560 }
1561 minor = iminor(inode);
1562 if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1563 !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1564 fput(file);
1565 return NULL;
1566 }
1567 return file;
1568 }
1569
1570 /*
1571 * PCM link handling
1572 */
1573 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1574 {
1575 int res = 0;
1576 struct file *file;
1577 struct snd_pcm_file *pcm_file;
1578 struct snd_pcm_substream *substream1;
1579
1580 file = snd_pcm_file_fd(fd);
1581 if (!file)
1582 return -EBADFD;
1583 pcm_file = file->private_data;
1584 substream1 = pcm_file->substream;
1585 down_write(&snd_pcm_link_rwsem);
1586 write_lock_irq(&snd_pcm_link_rwlock);
1587 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1588 substream->runtime->status->state != substream1->runtime->status->state) {
1589 res = -EBADFD;
1590 goto _end;
1591 }
1592 if (snd_pcm_stream_linked(substream1)) {
1593 res = -EALREADY;
1594 goto _end;
1595 }
1596 if (!snd_pcm_stream_linked(substream)) {
1597 substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC);
1598 if (substream->group == NULL) {
1599 res = -ENOMEM;
1600 goto _end;
1601 }
1602 spin_lock_init(&substream->group->lock);
1603 INIT_LIST_HEAD(&substream->group->substreams);
1604 list_add_tail(&substream->link_list, &substream->group->substreams);
1605 substream->group->count = 1;
1606 }
1607 list_add_tail(&substream1->link_list, &substream->group->substreams);
1608 substream->group->count++;
1609 substream1->group = substream->group;
1610 _end:
1611 write_unlock_irq(&snd_pcm_link_rwlock);
1612 up_write(&snd_pcm_link_rwsem);
1613 fput(file);
1614 return res;
1615 }
1616
1617 static void relink_to_local(struct snd_pcm_substream *substream)
1618 {
1619 substream->group = &substream->self_group;
1620 INIT_LIST_HEAD(&substream->self_group.substreams);
1621 list_add_tail(&substream->link_list, &substream->self_group.substreams);
1622 }
1623
1624 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1625 {
1626 struct snd_pcm_substream *s;
1627 int res = 0;
1628
1629 down_write(&snd_pcm_link_rwsem);
1630 write_lock_irq(&snd_pcm_link_rwlock);
1631 if (!snd_pcm_stream_linked(substream)) {
1632 res = -EALREADY;
1633 goto _end;
1634 }
1635 list_del(&substream->link_list);
1636 substream->group->count--;
1637 if (substream->group->count == 1) { /* detach the last stream, too */
1638 snd_pcm_group_for_each_entry(s, substream) {
1639 relink_to_local(s);
1640 break;
1641 }
1642 kfree(substream->group);
1643 }
1644 relink_to_local(substream);
1645 _end:
1646 write_unlock_irq(&snd_pcm_link_rwlock);
1647 up_write(&snd_pcm_link_rwsem);
1648 return res;
1649 }
1650
1651 /*
1652 * hw configurator
1653 */
1654 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1655 struct snd_pcm_hw_rule *rule)
1656 {
1657 struct snd_interval t;
1658 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1659 hw_param_interval_c(params, rule->deps[1]), &t);
1660 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1661 }
1662
1663 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1664 struct snd_pcm_hw_rule *rule)
1665 {
1666 struct snd_interval t;
1667 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1668 hw_param_interval_c(params, rule->deps[1]), &t);
1669 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1670 }
1671
1672 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1673 struct snd_pcm_hw_rule *rule)
1674 {
1675 struct snd_interval t;
1676 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1677 hw_param_interval_c(params, rule->deps[1]),
1678 (unsigned long) rule->private, &t);
1679 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1680 }
1681
1682 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1683 struct snd_pcm_hw_rule *rule)
1684 {
1685 struct snd_interval t;
1686 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1687 (unsigned long) rule->private,
1688 hw_param_interval_c(params, rule->deps[1]), &t);
1689 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1690 }
1691
1692 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1693 struct snd_pcm_hw_rule *rule)
1694 {
1695 unsigned int k;
1696 struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1697 struct snd_mask m;
1698 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1699 snd_mask_any(&m);
1700 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1701 int bits;
1702 if (! snd_mask_test(mask, k))
1703 continue;
1704 bits = snd_pcm_format_physical_width(k);
1705 if (bits <= 0)
1706 continue; /* ignore invalid formats */
1707 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1708 snd_mask_reset(&m, k);
1709 }
1710 return snd_mask_refine(mask, &m);
1711 }
1712
1713 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1714 struct snd_pcm_hw_rule *rule)
1715 {
1716 struct snd_interval t;
1717 unsigned int k;
1718 t.min = UINT_MAX;
1719 t.max = 0;
1720 t.openmin = 0;
1721 t.openmax = 0;
1722 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1723 int bits;
1724 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1725 continue;
1726 bits = snd_pcm_format_physical_width(k);
1727 if (bits <= 0)
1728 continue; /* ignore invalid formats */
1729 if (t.min > (unsigned)bits)
1730 t.min = bits;
1731 if (t.max < (unsigned)bits)
1732 t.max = bits;
1733 }
1734 t.integer = 1;
1735 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1736 }
1737
1738 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1739 #error "Change this table"
1740 #endif
1741
1742 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1743 48000, 64000, 88200, 96000, 176400, 192000 };
1744
1745 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1746 .count = ARRAY_SIZE(rates),
1747 .list = rates,
1748 };
1749
1750 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1751 struct snd_pcm_hw_rule *rule)
1752 {
1753 struct snd_pcm_hardware *hw = rule->private;
1754 return snd_interval_list(hw_param_interval(params, rule->var),
1755 snd_pcm_known_rates.count,
1756 snd_pcm_known_rates.list, hw->rates);
1757 }
1758
1759 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1760 struct snd_pcm_hw_rule *rule)
1761 {
1762 struct snd_interval t;
1763 struct snd_pcm_substream *substream = rule->private;
1764 t.min = 0;
1765 t.max = substream->buffer_bytes_max;
1766 t.openmin = 0;
1767 t.openmax = 0;
1768 t.integer = 1;
1769 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1770 }
1771
1772 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1773 {
1774 struct snd_pcm_runtime *runtime = substream->runtime;
1775 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1776 int k, err;
1777
1778 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1779 snd_mask_any(constrs_mask(constrs, k));
1780 }
1781
1782 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1783 snd_interval_any(constrs_interval(constrs, k));
1784 }
1785
1786 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1787 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1788 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1789 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1790 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1791
1792 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1793 snd_pcm_hw_rule_format, NULL,
1794 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1795 if (err < 0)
1796 return err;
1797 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1798 snd_pcm_hw_rule_sample_bits, NULL,
1799 SNDRV_PCM_HW_PARAM_FORMAT,
1800 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1801 if (err < 0)
1802 return err;
1803 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1804 snd_pcm_hw_rule_div, NULL,
1805 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1806 if (err < 0)
1807 return err;
1808 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1809 snd_pcm_hw_rule_mul, NULL,
1810 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1811 if (err < 0)
1812 return err;
1813 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1814 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1815 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1816 if (err < 0)
1817 return err;
1818 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1819 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1820 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1821 if (err < 0)
1822 return err;
1823 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1824 snd_pcm_hw_rule_div, NULL,
1825 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1826 if (err < 0)
1827 return err;
1828 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1829 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1830 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1831 if (err < 0)
1832 return err;
1833 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1834 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1835 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1836 if (err < 0)
1837 return err;
1838 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1839 snd_pcm_hw_rule_div, NULL,
1840 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1841 if (err < 0)
1842 return err;
1843 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1844 snd_pcm_hw_rule_div, NULL,
1845 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1846 if (err < 0)
1847 return err;
1848 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1849 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1850 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1851 if (err < 0)
1852 return err;
1853 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1854 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1855 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1856 if (err < 0)
1857 return err;
1858 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1859 snd_pcm_hw_rule_mul, NULL,
1860 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1861 if (err < 0)
1862 return err;
1863 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1864 snd_pcm_hw_rule_mulkdiv, (void*) 8,
1865 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1866 if (err < 0)
1867 return err;
1868 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1869 snd_pcm_hw_rule_muldivk, (void*) 1000000,
1870 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1871 if (err < 0)
1872 return err;
1873 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1874 snd_pcm_hw_rule_muldivk, (void*) 8,
1875 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1876 if (err < 0)
1877 return err;
1878 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1879 snd_pcm_hw_rule_muldivk, (void*) 8,
1880 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1881 if (err < 0)
1882 return err;
1883 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1884 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1885 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1886 if (err < 0)
1887 return err;
1888 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1889 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1890 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1891 if (err < 0)
1892 return err;
1893 return 0;
1894 }
1895
1896 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1897 {
1898 struct snd_pcm_runtime *runtime = substream->runtime;
1899 struct snd_pcm_hardware *hw = &runtime->hw;
1900 int err;
1901 unsigned int mask = 0;
1902
1903 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1904 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1905 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1906 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1907 if (hw->info & SNDRV_PCM_INFO_MMAP) {
1908 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1909 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1910 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1911 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1912 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1913 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1914 }
1915 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1916 if (err < 0)
1917 return err;
1918
1919 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1920 if (err < 0)
1921 return err;
1922
1923 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1924 if (err < 0)
1925 return err;
1926
1927 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1928 hw->channels_min, hw->channels_max);
1929 if (err < 0)
1930 return err;
1931
1932 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1933 hw->rate_min, hw->rate_max);
1934 if (err < 0)
1935 return err;
1936
1937 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1938 hw->period_bytes_min, hw->period_bytes_max);
1939 if (err < 0)
1940 return err;
1941
1942 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1943 hw->periods_min, hw->periods_max);
1944 if (err < 0)
1945 return err;
1946
1947 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1948 hw->period_bytes_min, hw->buffer_bytes_max);
1949 if (err < 0)
1950 return err;
1951
1952 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1953 snd_pcm_hw_rule_buffer_bytes_max, substream,
1954 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1955 if (err < 0)
1956 return err;
1957
1958 /* FIXME: remove */
1959 if (runtime->dma_bytes) {
1960 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
1961 if (err < 0)
1962 return -EINVAL;
1963 }
1964
1965 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
1966 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1967 snd_pcm_hw_rule_rate, hw,
1968 SNDRV_PCM_HW_PARAM_RATE, -1);
1969 if (err < 0)
1970 return err;
1971 }
1972
1973 /* FIXME: this belong to lowlevel */
1974 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
1975
1976 return 0;
1977 }
1978
1979 static void pcm_release_private(struct snd_pcm_substream *substream)
1980 {
1981 snd_pcm_unlink(substream);
1982 }
1983
1984 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
1985 {
1986 substream->ref_count--;
1987 if (substream->ref_count > 0)
1988 return;
1989
1990 snd_pcm_drop(substream);
1991 if (substream->hw_opened) {
1992 if (substream->ops->hw_free != NULL)
1993 substream->ops->hw_free(substream);
1994 substream->ops->close(substream);
1995 substream->hw_opened = 0;
1996 }
1997 if (substream->pcm_release) {
1998 substream->pcm_release(substream);
1999 substream->pcm_release = NULL;
2000 }
2001 snd_pcm_detach_substream(substream);
2002 }
2003
2004 EXPORT_SYMBOL(snd_pcm_release_substream);
2005
2006 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2007 struct file *file,
2008 struct snd_pcm_substream **rsubstream)
2009 {
2010 struct snd_pcm_substream *substream;
2011 int err;
2012
2013 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2014 if (err < 0)
2015 return err;
2016 if (substream->ref_count > 1) {
2017 *rsubstream = substream;
2018 return 0;
2019 }
2020
2021 err = snd_pcm_hw_constraints_init(substream);
2022 if (err < 0) {
2023 snd_printd("snd_pcm_hw_constraints_init failed\n");
2024 goto error;
2025 }
2026
2027 if ((err = substream->ops->open(substream)) < 0)
2028 goto error;
2029
2030 substream->hw_opened = 1;
2031
2032 err = snd_pcm_hw_constraints_complete(substream);
2033 if (err < 0) {
2034 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2035 goto error;
2036 }
2037
2038 *rsubstream = substream;
2039 return 0;
2040
2041 error:
2042 snd_pcm_release_substream(substream);
2043 return err;
2044 }
2045
2046 EXPORT_SYMBOL(snd_pcm_open_substream);
2047
2048 static int snd_pcm_open_file(struct file *file,
2049 struct snd_pcm *pcm,
2050 int stream,
2051 struct snd_pcm_file **rpcm_file)
2052 {
2053 struct snd_pcm_file *pcm_file;
2054 struct snd_pcm_substream *substream;
2055 struct snd_pcm_str *str;
2056 int err;
2057
2058 if (rpcm_file)
2059 *rpcm_file = NULL;
2060
2061 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2062 if (err < 0)
2063 return err;
2064
2065 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2066 if (pcm_file == NULL) {
2067 snd_pcm_release_substream(substream);
2068 return -ENOMEM;
2069 }
2070 pcm_file->substream = substream;
2071 if (substream->ref_count == 1) {
2072 str = substream->pstr;
2073 substream->file = pcm_file;
2074 substream->pcm_release = pcm_release_private;
2075 }
2076 file->private_data = pcm_file;
2077 if (rpcm_file)
2078 *rpcm_file = pcm_file;
2079 return 0;
2080 }
2081
2082 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2083 {
2084 struct snd_pcm *pcm;
2085 int err = nonseekable_open(inode, file);
2086 if (err < 0)
2087 return err;
2088 pcm = snd_lookup_minor_data(iminor(inode),
2089 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2090 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2091 }
2092
2093 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2094 {
2095 struct snd_pcm *pcm;
2096 int err = nonseekable_open(inode, file);
2097 if (err < 0)
2098 return err;
2099 pcm = snd_lookup_minor_data(iminor(inode),
2100 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2101 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2102 }
2103
2104 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2105 {
2106 int err;
2107 struct snd_pcm_file *pcm_file;
2108 wait_queue_t wait;
2109
2110 if (pcm == NULL) {
2111 err = -ENODEV;
2112 goto __error1;
2113 }
2114 err = snd_card_file_add(pcm->card, file);
2115 if (err < 0)
2116 goto __error1;
2117 if (!try_module_get(pcm->card->module)) {
2118 err = -EFAULT;
2119 goto __error2;
2120 }
2121 init_waitqueue_entry(&wait, current);
2122 add_wait_queue(&pcm->open_wait, &wait);
2123 mutex_lock(&pcm->open_mutex);
2124 while (1) {
2125 err = snd_pcm_open_file(file, pcm, stream, &pcm_file);
2126 if (err >= 0)
2127 break;
2128 if (err == -EAGAIN) {
2129 if (file->f_flags & O_NONBLOCK) {
2130 err = -EBUSY;
2131 break;
2132 }
2133 } else
2134 break;
2135 set_current_state(TASK_INTERRUPTIBLE);
2136 mutex_unlock(&pcm->open_mutex);
2137 schedule();
2138 mutex_lock(&pcm->open_mutex);
2139 if (signal_pending(current)) {
2140 err = -ERESTARTSYS;
2141 break;
2142 }
2143 }
2144 remove_wait_queue(&pcm->open_wait, &wait);
2145 mutex_unlock(&pcm->open_mutex);
2146 if (err < 0)
2147 goto __error;
2148 return err;
2149
2150 __error:
2151 module_put(pcm->card->module);
2152 __error2:
2153 snd_card_file_remove(pcm->card, file);
2154 __error1:
2155 return err;
2156 }
2157
2158 static int snd_pcm_release(struct inode *inode, struct file *file)
2159 {
2160 struct snd_pcm *pcm;
2161 struct snd_pcm_substream *substream;
2162 struct snd_pcm_file *pcm_file;
2163
2164 pcm_file = file->private_data;
2165 substream = pcm_file->substream;
2166 if (snd_BUG_ON(!substream))
2167 return -ENXIO;
2168 pcm = substream->pcm;
2169 mutex_lock(&pcm->open_mutex);
2170 snd_pcm_release_substream(substream);
2171 kfree(pcm_file);
2172 mutex_unlock(&pcm->open_mutex);
2173 wake_up(&pcm->open_wait);
2174 module_put(pcm->card->module);
2175 snd_card_file_remove(pcm->card, file);
2176 return 0;
2177 }
2178
2179 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2180 snd_pcm_uframes_t frames)
2181 {
2182 struct snd_pcm_runtime *runtime = substream->runtime;
2183 snd_pcm_sframes_t appl_ptr;
2184 snd_pcm_sframes_t ret;
2185 snd_pcm_sframes_t hw_avail;
2186
2187 if (frames == 0)
2188 return 0;
2189
2190 snd_pcm_stream_lock_irq(substream);
2191 switch (runtime->status->state) {
2192 case SNDRV_PCM_STATE_PREPARED:
2193 break;
2194 case SNDRV_PCM_STATE_DRAINING:
2195 case SNDRV_PCM_STATE_RUNNING:
2196 if (snd_pcm_update_hw_ptr(substream) >= 0)
2197 break;
2198 /* Fall through */
2199 case SNDRV_PCM_STATE_XRUN:
2200 ret = -EPIPE;
2201 goto __end;
2202 case SNDRV_PCM_STATE_SUSPENDED:
2203 ret = -ESTRPIPE;
2204 goto __end;
2205 default:
2206 ret = -EBADFD;
2207 goto __end;
2208 }
2209
2210 hw_avail = snd_pcm_playback_hw_avail(runtime);
2211 if (hw_avail <= 0) {
2212 ret = 0;
2213 goto __end;
2214 }
2215 if (frames > (snd_pcm_uframes_t)hw_avail)
2216 frames = hw_avail;
2217 appl_ptr = runtime->control->appl_ptr - frames;
2218 if (appl_ptr < 0)
2219 appl_ptr += runtime->boundary;
2220 runtime->control->appl_ptr = appl_ptr;
2221 ret = frames;
2222 __end:
2223 snd_pcm_stream_unlock_irq(substream);
2224 return ret;
2225 }
2226
2227 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2228 snd_pcm_uframes_t frames)
2229 {
2230 struct snd_pcm_runtime *runtime = substream->runtime;
2231 snd_pcm_sframes_t appl_ptr;
2232 snd_pcm_sframes_t ret;
2233 snd_pcm_sframes_t hw_avail;
2234
2235 if (frames == 0)
2236 return 0;
2237
2238 snd_pcm_stream_lock_irq(substream);
2239 switch (runtime->status->state) {
2240 case SNDRV_PCM_STATE_PREPARED:
2241 case SNDRV_PCM_STATE_DRAINING:
2242 break;
2243 case SNDRV_PCM_STATE_RUNNING:
2244 if (snd_pcm_update_hw_ptr(substream) >= 0)
2245 break;
2246 /* Fall through */
2247 case SNDRV_PCM_STATE_XRUN:
2248 ret = -EPIPE;
2249 goto __end;
2250 case SNDRV_PCM_STATE_SUSPENDED:
2251 ret = -ESTRPIPE;
2252 goto __end;
2253 default:
2254 ret = -EBADFD;
2255 goto __end;
2256 }
2257
2258 hw_avail = snd_pcm_capture_hw_avail(runtime);
2259 if (hw_avail <= 0) {
2260 ret = 0;
2261 goto __end;
2262 }
2263 if (frames > (snd_pcm_uframes_t)hw_avail)
2264 frames = hw_avail;
2265 appl_ptr = runtime->control->appl_ptr - frames;
2266 if (appl_ptr < 0)
2267 appl_ptr += runtime->boundary;
2268 runtime->control->appl_ptr = appl_ptr;
2269 ret = frames;
2270 __end:
2271 snd_pcm_stream_unlock_irq(substream);
2272 return ret;
2273 }
2274
2275 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2276 snd_pcm_uframes_t frames)
2277 {
2278 struct snd_pcm_runtime *runtime = substream->runtime;
2279 snd_pcm_sframes_t appl_ptr;
2280 snd_pcm_sframes_t ret;
2281 snd_pcm_sframes_t avail;
2282
2283 if (frames == 0)
2284 return 0;
2285
2286 snd_pcm_stream_lock_irq(substream);
2287 switch (runtime->status->state) {
2288 case SNDRV_PCM_STATE_PREPARED:
2289 case SNDRV_PCM_STATE_PAUSED:
2290 break;
2291 case SNDRV_PCM_STATE_DRAINING:
2292 case SNDRV_PCM_STATE_RUNNING:
2293 if (snd_pcm_update_hw_ptr(substream) >= 0)
2294 break;
2295 /* Fall through */
2296 case SNDRV_PCM_STATE_XRUN:
2297 ret = -EPIPE;
2298 goto __end;
2299 case SNDRV_PCM_STATE_SUSPENDED:
2300 ret = -ESTRPIPE;
2301 goto __end;
2302 default:
2303 ret = -EBADFD;
2304 goto __end;
2305 }
2306
2307 avail = snd_pcm_playback_avail(runtime);
2308 if (avail <= 0) {
2309 ret = 0;
2310 goto __end;
2311 }
2312 if (frames > (snd_pcm_uframes_t)avail)
2313 frames = avail;
2314 appl_ptr = runtime->control->appl_ptr + frames;
2315 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2316 appl_ptr -= runtime->boundary;
2317 runtime->control->appl_ptr = appl_ptr;
2318 ret = frames;
2319 __end:
2320 snd_pcm_stream_unlock_irq(substream);
2321 return ret;
2322 }
2323
2324 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2325 snd_pcm_uframes_t frames)
2326 {
2327 struct snd_pcm_runtime *runtime = substream->runtime;
2328 snd_pcm_sframes_t appl_ptr;
2329 snd_pcm_sframes_t ret;
2330 snd_pcm_sframes_t avail;
2331
2332 if (frames == 0)
2333 return 0;
2334
2335 snd_pcm_stream_lock_irq(substream);
2336 switch (runtime->status->state) {
2337 case SNDRV_PCM_STATE_PREPARED:
2338 case SNDRV_PCM_STATE_DRAINING:
2339 case SNDRV_PCM_STATE_PAUSED:
2340 break;
2341 case SNDRV_PCM_STATE_RUNNING:
2342 if (snd_pcm_update_hw_ptr(substream) >= 0)
2343 break;
2344 /* Fall through */
2345 case SNDRV_PCM_STATE_XRUN:
2346 ret = -EPIPE;
2347 goto __end;
2348 case SNDRV_PCM_STATE_SUSPENDED:
2349 ret = -ESTRPIPE;
2350 goto __end;
2351 default:
2352 ret = -EBADFD;
2353 goto __end;
2354 }
2355
2356 avail = snd_pcm_capture_avail(runtime);
2357 if (avail <= 0) {
2358 ret = 0;
2359 goto __end;
2360 }
2361 if (frames > (snd_pcm_uframes_t)avail)
2362 frames = avail;
2363 appl_ptr = runtime->control->appl_ptr + frames;
2364 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2365 appl_ptr -= runtime->boundary;
2366 runtime->control->appl_ptr = appl_ptr;
2367 ret = frames;
2368 __end:
2369 snd_pcm_stream_unlock_irq(substream);
2370 return ret;
2371 }
2372
2373 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2374 {
2375 struct snd_pcm_runtime *runtime = substream->runtime;
2376 int err;
2377
2378 snd_pcm_stream_lock_irq(substream);
2379 switch (runtime->status->state) {
2380 case SNDRV_PCM_STATE_DRAINING:
2381 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2382 goto __badfd;
2383 case SNDRV_PCM_STATE_RUNNING:
2384 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2385 break;
2386 /* Fall through */
2387 case SNDRV_PCM_STATE_PREPARED:
2388 case SNDRV_PCM_STATE_SUSPENDED:
2389 err = 0;
2390 break;
2391 case SNDRV_PCM_STATE_XRUN:
2392 err = -EPIPE;
2393 break;
2394 default:
2395 __badfd:
2396 err = -EBADFD;
2397 break;
2398 }
2399 snd_pcm_stream_unlock_irq(substream);
2400 return err;
2401 }
2402
2403 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2404 snd_pcm_sframes_t __user *res)
2405 {
2406 struct snd_pcm_runtime *runtime = substream->runtime;
2407 int err;
2408 snd_pcm_sframes_t n = 0;
2409
2410 snd_pcm_stream_lock_irq(substream);
2411 switch (runtime->status->state) {
2412 case SNDRV_PCM_STATE_DRAINING:
2413 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2414 goto __badfd;
2415 case SNDRV_PCM_STATE_RUNNING:
2416 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2417 break;
2418 /* Fall through */
2419 case SNDRV_PCM_STATE_PREPARED:
2420 case SNDRV_PCM_STATE_SUSPENDED:
2421 err = 0;
2422 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2423 n = snd_pcm_playback_hw_avail(runtime);
2424 else
2425 n = snd_pcm_capture_avail(runtime);
2426 n += runtime->delay;
2427 break;
2428 case SNDRV_PCM_STATE_XRUN:
2429 err = -EPIPE;
2430 break;
2431 default:
2432 __badfd:
2433 err = -EBADFD;
2434 break;
2435 }
2436 snd_pcm_stream_unlock_irq(substream);
2437 if (!err)
2438 if (put_user(n, res))
2439 err = -EFAULT;
2440 return err;
2441 }
2442
2443 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2444 struct snd_pcm_sync_ptr __user *_sync_ptr)
2445 {
2446 struct snd_pcm_runtime *runtime = substream->runtime;
2447 struct snd_pcm_sync_ptr sync_ptr;
2448 volatile struct snd_pcm_mmap_status *status;
2449 volatile struct snd_pcm_mmap_control *control;
2450 int err;
2451
2452 memset(&sync_ptr, 0, sizeof(sync_ptr));
2453 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2454 return -EFAULT;
2455 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2456 return -EFAULT;
2457 status = runtime->status;
2458 control = runtime->control;
2459 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2460 err = snd_pcm_hwsync(substream);
2461 if (err < 0)
2462 return err;
2463 }
2464 snd_pcm_stream_lock_irq(substream);
2465 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2466 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2467 else
2468 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2469 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2470 control->avail_min = sync_ptr.c.control.avail_min;
2471 else
2472 sync_ptr.c.control.avail_min = control->avail_min;
2473 sync_ptr.s.status.state = status->state;
2474 sync_ptr.s.status.hw_ptr = status->hw_ptr;
2475 sync_ptr.s.status.tstamp = status->tstamp;
2476 sync_ptr.s.status.suspended_state = status->suspended_state;
2477 snd_pcm_stream_unlock_irq(substream);
2478 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2479 return -EFAULT;
2480 return 0;
2481 }
2482
2483 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2484 {
2485 struct snd_pcm_runtime *runtime = substream->runtime;
2486 int arg;
2487
2488 if (get_user(arg, _arg))
2489 return -EFAULT;
2490 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2491 return -EINVAL;
2492 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2493 if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2494 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2495 return 0;
2496 }
2497
2498 static int snd_pcm_common_ioctl1(struct file *file,
2499 struct snd_pcm_substream *substream,
2500 unsigned int cmd, void __user *arg)
2501 {
2502 switch (cmd) {
2503 case SNDRV_PCM_IOCTL_PVERSION:
2504 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2505 case SNDRV_PCM_IOCTL_INFO:
2506 return snd_pcm_info_user(substream, arg);
2507 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
2508 return 0;
2509 case SNDRV_PCM_IOCTL_TTSTAMP:
2510 return snd_pcm_tstamp(substream, arg);
2511 case SNDRV_PCM_IOCTL_HW_REFINE:
2512 return snd_pcm_hw_refine_user(substream, arg);
2513 case SNDRV_PCM_IOCTL_HW_PARAMS:
2514 return snd_pcm_hw_params_user(substream, arg);
2515 case SNDRV_PCM_IOCTL_HW_FREE:
2516 return snd_pcm_hw_free(substream);
2517 case SNDRV_PCM_IOCTL_SW_PARAMS:
2518 return snd_pcm_sw_params_user(substream, arg);
2519 case SNDRV_PCM_IOCTL_STATUS:
2520 return snd_pcm_status_user(substream, arg);
2521 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2522 return snd_pcm_channel_info_user(substream, arg);
2523 case SNDRV_PCM_IOCTL_PREPARE:
2524 return snd_pcm_prepare(substream, file);
2525 case SNDRV_PCM_IOCTL_RESET:
2526 return snd_pcm_reset(substream);
2527 case SNDRV_PCM_IOCTL_START:
2528 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2529 case SNDRV_PCM_IOCTL_LINK:
2530 return snd_pcm_link(substream, (int)(unsigned long) arg);
2531 case SNDRV_PCM_IOCTL_UNLINK:
2532 return snd_pcm_unlink(substream);
2533 case SNDRV_PCM_IOCTL_RESUME:
2534 return snd_pcm_resume(substream);
2535 case SNDRV_PCM_IOCTL_XRUN:
2536 return snd_pcm_xrun(substream);
2537 case SNDRV_PCM_IOCTL_HWSYNC:
2538 return snd_pcm_hwsync(substream);
2539 case SNDRV_PCM_IOCTL_DELAY:
2540 return snd_pcm_delay(substream, arg);
2541 case SNDRV_PCM_IOCTL_SYNC_PTR:
2542 return snd_pcm_sync_ptr(substream, arg);
2543 #ifdef CONFIG_SND_SUPPORT_OLD_API
2544 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2545 return snd_pcm_hw_refine_old_user(substream, arg);
2546 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2547 return snd_pcm_hw_params_old_user(substream, arg);
2548 #endif
2549 case SNDRV_PCM_IOCTL_DRAIN:
2550 return snd_pcm_drain(substream, file);
2551 case SNDRV_PCM_IOCTL_DROP:
2552 return snd_pcm_drop(substream);
2553 case SNDRV_PCM_IOCTL_PAUSE:
2554 {
2555 int res;
2556 snd_pcm_stream_lock_irq(substream);
2557 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2558 snd_pcm_stream_unlock_irq(substream);
2559 return res;
2560 }
2561 }
2562 snd_printd("unknown ioctl = 0x%x\n", cmd);
2563 return -ENOTTY;
2564 }
2565
2566 static int snd_pcm_playback_ioctl1(struct file *file,
2567 struct snd_pcm_substream *substream,
2568 unsigned int cmd, void __user *arg)
2569 {
2570 if (snd_BUG_ON(!substream))
2571 return -ENXIO;
2572 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2573 return -EINVAL;
2574 switch (cmd) {
2575 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2576 {
2577 struct snd_xferi xferi;
2578 struct snd_xferi __user *_xferi = arg;
2579 struct snd_pcm_runtime *runtime = substream->runtime;
2580 snd_pcm_sframes_t result;
2581 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2582 return -EBADFD;
2583 if (put_user(0, &_xferi->result))
2584 return -EFAULT;
2585 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2586 return -EFAULT;
2587 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2588 __put_user(result, &_xferi->result);
2589 return result < 0 ? result : 0;
2590 }
2591 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2592 {
2593 struct snd_xfern xfern;
2594 struct snd_xfern __user *_xfern = arg;
2595 struct snd_pcm_runtime *runtime = substream->runtime;
2596 void __user **bufs;
2597 snd_pcm_sframes_t result;
2598 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2599 return -EBADFD;
2600 if (runtime->channels > 128)
2601 return -EINVAL;
2602 if (put_user(0, &_xfern->result))
2603 return -EFAULT;
2604 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2605 return -EFAULT;
2606
2607 bufs = memdup_user(xfern.bufs,
2608 sizeof(void *) * runtime->channels);
2609 if (IS_ERR(bufs))
2610 return PTR_ERR(bufs);
2611 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2612 kfree(bufs);
2613 __put_user(result, &_xfern->result);
2614 return result < 0 ? result : 0;
2615 }
2616 case SNDRV_PCM_IOCTL_REWIND:
2617 {
2618 snd_pcm_uframes_t frames;
2619 snd_pcm_uframes_t __user *_frames = arg;
2620 snd_pcm_sframes_t result;
2621 if (get_user(frames, _frames))
2622 return -EFAULT;
2623 if (put_user(0, _frames))
2624 return -EFAULT;
2625 result = snd_pcm_playback_rewind(substream, frames);
2626 __put_user(result, _frames);
2627 return result < 0 ? result : 0;
2628 }
2629 case SNDRV_PCM_IOCTL_FORWARD:
2630 {
2631 snd_pcm_uframes_t frames;
2632 snd_pcm_uframes_t __user *_frames = arg;
2633 snd_pcm_sframes_t result;
2634 if (get_user(frames, _frames))
2635 return -EFAULT;
2636 if (put_user(0, _frames))
2637 return -EFAULT;
2638 result = snd_pcm_playback_forward(substream, frames);
2639 __put_user(result, _frames);
2640 return result < 0 ? result : 0;
2641 }
2642 }
2643 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2644 }
2645
2646 static int snd_pcm_capture_ioctl1(struct file *file,
2647 struct snd_pcm_substream *substream,
2648 unsigned int cmd, void __user *arg)
2649 {
2650 if (snd_BUG_ON(!substream))
2651 return -ENXIO;
2652 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2653 return -EINVAL;
2654 switch (cmd) {
2655 case SNDRV_PCM_IOCTL_READI_FRAMES:
2656 {
2657 struct snd_xferi xferi;
2658 struct snd_xferi __user *_xferi = arg;
2659 struct snd_pcm_runtime *runtime = substream->runtime;
2660 snd_pcm_sframes_t result;
2661 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2662 return -EBADFD;
2663 if (put_user(0, &_xferi->result))
2664 return -EFAULT;
2665 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2666 return -EFAULT;
2667 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2668 __put_user(result, &_xferi->result);
2669 return result < 0 ? result : 0;
2670 }
2671 case SNDRV_PCM_IOCTL_READN_FRAMES:
2672 {
2673 struct snd_xfern xfern;
2674 struct snd_xfern __user *_xfern = arg;
2675 struct snd_pcm_runtime *runtime = substream->runtime;
2676 void *bufs;
2677 snd_pcm_sframes_t result;
2678 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2679 return -EBADFD;
2680 if (runtime->channels > 128)
2681 return -EINVAL;
2682 if (put_user(0, &_xfern->result))
2683 return -EFAULT;
2684 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2685 return -EFAULT;
2686
2687 bufs = memdup_user(xfern.bufs,
2688 sizeof(void *) * runtime->channels);
2689 if (IS_ERR(bufs))
2690 return PTR_ERR(bufs);
2691 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2692 kfree(bufs);
2693 __put_user(result, &_xfern->result);
2694 return result < 0 ? result : 0;
2695 }
2696 case SNDRV_PCM_IOCTL_REWIND:
2697 {
2698 snd_pcm_uframes_t frames;
2699 snd_pcm_uframes_t __user *_frames = arg;
2700 snd_pcm_sframes_t result;
2701 if (get_user(frames, _frames))
2702 return -EFAULT;
2703 if (put_user(0, _frames))
2704 return -EFAULT;
2705 result = snd_pcm_capture_rewind(substream, frames);
2706 __put_user(result, _frames);
2707 return result < 0 ? result : 0;
2708 }
2709 case SNDRV_PCM_IOCTL_FORWARD:
2710 {
2711 snd_pcm_uframes_t frames;
2712 snd_pcm_uframes_t __user *_frames = arg;
2713 snd_pcm_sframes_t result;
2714 if (get_user(frames, _frames))
2715 return -EFAULT;
2716 if (put_user(0, _frames))
2717 return -EFAULT;
2718 result = snd_pcm_capture_forward(substream, frames);
2719 __put_user(result, _frames);
2720 return result < 0 ? result : 0;
2721 }
2722 }
2723 return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2724 }
2725
2726 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2727 unsigned long arg)
2728 {
2729 struct snd_pcm_file *pcm_file;
2730
2731 pcm_file = file->private_data;
2732
2733 if (((cmd >> 8) & 0xff) != 'A')
2734 return -ENOTTY;
2735
2736 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2737 (void __user *)arg);
2738 }
2739
2740 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2741 unsigned long arg)
2742 {
2743 struct snd_pcm_file *pcm_file;
2744
2745 pcm_file = file->private_data;
2746
2747 if (((cmd >> 8) & 0xff) != 'A')
2748 return -ENOTTY;
2749
2750 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2751 (void __user *)arg);
2752 }
2753
2754 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2755 unsigned int cmd, void *arg)
2756 {
2757 mm_segment_t fs;
2758 int result;
2759
2760 fs = snd_enter_user();
2761 switch (substream->stream) {
2762 case SNDRV_PCM_STREAM_PLAYBACK:
2763 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2764 (void __user *)arg);
2765 break;
2766 case SNDRV_PCM_STREAM_CAPTURE:
2767 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2768 (void __user *)arg);
2769 break;
2770 default:
2771 result = -EINVAL;
2772 break;
2773 }
2774 snd_leave_user(fs);
2775 return result;
2776 }
2777
2778 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2779
2780 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2781 loff_t * offset)
2782 {
2783 struct snd_pcm_file *pcm_file;
2784 struct snd_pcm_substream *substream;
2785 struct snd_pcm_runtime *runtime;
2786 snd_pcm_sframes_t result;
2787
2788 pcm_file = file->private_data;
2789 substream = pcm_file->substream;
2790 if (PCM_RUNTIME_CHECK(substream))
2791 return -ENXIO;
2792 runtime = substream->runtime;
2793 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2794 return -EBADFD;
2795 if (!frame_aligned(runtime, count))
2796 return -EINVAL;
2797 count = bytes_to_frames(runtime, count);
2798 result = snd_pcm_lib_read(substream, buf, count);
2799 if (result > 0)
2800 result = frames_to_bytes(runtime, result);
2801 return result;
2802 }
2803
2804 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2805 size_t count, loff_t * offset)
2806 {
2807 struct snd_pcm_file *pcm_file;
2808 struct snd_pcm_substream *substream;
2809 struct snd_pcm_runtime *runtime;
2810 snd_pcm_sframes_t result;
2811
2812 pcm_file = file->private_data;
2813 substream = pcm_file->substream;
2814 if (PCM_RUNTIME_CHECK(substream))
2815 return -ENXIO;
2816 runtime = substream->runtime;
2817 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2818 return -EBADFD;
2819 if (!frame_aligned(runtime, count))
2820 return -EINVAL;
2821 count = bytes_to_frames(runtime, count);
2822 result = snd_pcm_lib_write(substream, buf, count);
2823 if (result > 0)
2824 result = frames_to_bytes(runtime, result);
2825 return result;
2826 }
2827
2828 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2829 unsigned long nr_segs, loff_t pos)
2830
2831 {
2832 struct snd_pcm_file *pcm_file;
2833 struct snd_pcm_substream *substream;
2834 struct snd_pcm_runtime *runtime;
2835 snd_pcm_sframes_t result;
2836 unsigned long i;
2837 void __user **bufs;
2838 snd_pcm_uframes_t frames;
2839
2840 pcm_file = iocb->ki_filp->private_data;
2841 substream = pcm_file->substream;
2842 if (PCM_RUNTIME_CHECK(substream))
2843 return -ENXIO;
2844 runtime = substream->runtime;
2845 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2846 return -EBADFD;
2847 if (nr_segs > 1024 || nr_segs != runtime->channels)
2848 return -EINVAL;
2849 if (!frame_aligned(runtime, iov->iov_len))
2850 return -EINVAL;
2851 frames = bytes_to_samples(runtime, iov->iov_len);
2852 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2853 if (bufs == NULL)
2854 return -ENOMEM;
2855 for (i = 0; i < nr_segs; ++i)
2856 bufs[i] = iov[i].iov_base;
2857 result = snd_pcm_lib_readv(substream, bufs, frames);
2858 if (result > 0)
2859 result = frames_to_bytes(runtime, result);
2860 kfree(bufs);
2861 return result;
2862 }
2863
2864 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2865 unsigned long nr_segs, loff_t pos)
2866 {
2867 struct snd_pcm_file *pcm_file;
2868 struct snd_pcm_substream *substream;
2869 struct snd_pcm_runtime *runtime;
2870 snd_pcm_sframes_t result;
2871 unsigned long i;
2872 void __user **bufs;
2873 snd_pcm_uframes_t frames;
2874
2875 pcm_file = iocb->ki_filp->private_data;
2876 substream = pcm_file->substream;
2877 if (PCM_RUNTIME_CHECK(substream))
2878 return -ENXIO;
2879 runtime = substream->runtime;
2880 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2881 return -EBADFD;
2882 if (nr_segs > 128 || nr_segs != runtime->channels ||
2883 !frame_aligned(runtime, iov->iov_len))
2884 return -EINVAL;
2885 frames = bytes_to_samples(runtime, iov->iov_len);
2886 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2887 if (bufs == NULL)
2888 return -ENOMEM;
2889 for (i = 0; i < nr_segs; ++i)
2890 bufs[i] = iov[i].iov_base;
2891 result = snd_pcm_lib_writev(substream, bufs, frames);
2892 if (result > 0)
2893 result = frames_to_bytes(runtime, result);
2894 kfree(bufs);
2895 return result;
2896 }
2897
2898 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2899 {
2900 struct snd_pcm_file *pcm_file;
2901 struct snd_pcm_substream *substream;
2902 struct snd_pcm_runtime *runtime;
2903 unsigned int mask;
2904 snd_pcm_uframes_t avail;
2905
2906 pcm_file = file->private_data;
2907
2908 substream = pcm_file->substream;
2909 if (PCM_RUNTIME_CHECK(substream))
2910 return -ENXIO;
2911 runtime = substream->runtime;
2912
2913 poll_wait(file, &runtime->sleep, wait);
2914
2915 snd_pcm_stream_lock_irq(substream);
2916 avail = snd_pcm_playback_avail(runtime);
2917 switch (runtime->status->state) {
2918 case SNDRV_PCM_STATE_RUNNING:
2919 case SNDRV_PCM_STATE_PREPARED:
2920 case SNDRV_PCM_STATE_PAUSED:
2921 if (avail >= runtime->control->avail_min) {
2922 mask = POLLOUT | POLLWRNORM;
2923 break;
2924 }
2925 /* Fall through */
2926 case SNDRV_PCM_STATE_DRAINING:
2927 mask = 0;
2928 break;
2929 default:
2930 mask = POLLOUT | POLLWRNORM | POLLERR;
2931 break;
2932 }
2933 snd_pcm_stream_unlock_irq(substream);
2934 return mask;
2935 }
2936
2937 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2938 {
2939 struct snd_pcm_file *pcm_file;
2940 struct snd_pcm_substream *substream;
2941 struct snd_pcm_runtime *runtime;
2942 unsigned int mask;
2943 snd_pcm_uframes_t avail;
2944
2945 pcm_file = file->private_data;
2946
2947 substream = pcm_file->substream;
2948 if (PCM_RUNTIME_CHECK(substream))
2949 return -ENXIO;
2950 runtime = substream->runtime;
2951
2952 poll_wait(file, &runtime->sleep, wait);
2953
2954 snd_pcm_stream_lock_irq(substream);
2955 avail = snd_pcm_capture_avail(runtime);
2956 switch (runtime->status->state) {
2957 case SNDRV_PCM_STATE_RUNNING:
2958 case SNDRV_PCM_STATE_PREPARED:
2959 case SNDRV_PCM_STATE_PAUSED:
2960 if (avail >= runtime->control->avail_min) {
2961 mask = POLLIN | POLLRDNORM;
2962 break;
2963 }
2964 mask = 0;
2965 break;
2966 case SNDRV_PCM_STATE_DRAINING:
2967 if (avail > 0) {
2968 mask = POLLIN | POLLRDNORM;
2969 break;
2970 }
2971 /* Fall through */
2972 default:
2973 mask = POLLIN | POLLRDNORM | POLLERR;
2974 break;
2975 }
2976 snd_pcm_stream_unlock_irq(substream);
2977 return mask;
2978 }
2979
2980 /*
2981 * mmap support
2982 */
2983
2984 /*
2985 * Only on coherent architectures, we can mmap the status and the control records
2986 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
2987 */
2988 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
2989 /*
2990 * mmap status record
2991 */
2992 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
2993 struct vm_fault *vmf)
2994 {
2995 struct snd_pcm_substream *substream = area->vm_private_data;
2996 struct snd_pcm_runtime *runtime;
2997
2998 if (substream == NULL)
2999 return VM_FAULT_SIGBUS;
3000 runtime = substream->runtime;
3001 vmf->page = virt_to_page(runtime->status);
3002 get_page(vmf->page);
3003 return 0;
3004 }
3005
3006 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3007 {
3008 .fault = snd_pcm_mmap_status_fault,
3009 };
3010
3011 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3012 struct vm_area_struct *area)
3013 {
3014 struct snd_pcm_runtime *runtime;
3015 long size;
3016 if (!(area->vm_flags & VM_READ))
3017 return -EINVAL;
3018 runtime = substream->runtime;
3019 size = area->vm_end - area->vm_start;
3020 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3021 return -EINVAL;
3022 area->vm_ops = &snd_pcm_vm_ops_status;
3023 area->vm_private_data = substream;
3024 area->vm_flags |= VM_RESERVED;
3025 return 0;
3026 }
3027
3028 /*
3029 * mmap control record
3030 */
3031 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3032 struct vm_fault *vmf)
3033 {
3034 struct snd_pcm_substream *substream = area->vm_private_data;
3035 struct snd_pcm_runtime *runtime;
3036
3037 if (substream == NULL)
3038 return VM_FAULT_SIGBUS;
3039 runtime = substream->runtime;
3040 vmf->page = virt_to_page(runtime->control);
3041 get_page(vmf->page);
3042 return 0;
3043 }
3044
3045 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3046 {
3047 .fault = snd_pcm_mmap_control_fault,
3048 };
3049
3050 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3051 struct vm_area_struct *area)
3052 {
3053 struct snd_pcm_runtime *runtime;
3054 long size;
3055 if (!(area->vm_flags & VM_READ))
3056 return -EINVAL;
3057 runtime = substream->runtime;
3058 size = area->vm_end - area->vm_start;
3059 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3060 return -EINVAL;
3061 area->vm_ops = &snd_pcm_vm_ops_control;
3062 area->vm_private_data = substream;
3063 area->vm_flags |= VM_RESERVED;
3064 return 0;
3065 }
3066 #else /* ! coherent mmap */
3067 /*
3068 * don't support mmap for status and control records.
3069 */
3070 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3071 struct vm_area_struct *area)
3072 {
3073 return -ENXIO;
3074 }
3075 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3076 struct vm_area_struct *area)
3077 {
3078 return -ENXIO;
3079 }
3080 #endif /* coherent mmap */
3081
3082 static inline struct page *
3083 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3084 {
3085 void *vaddr = substream->runtime->dma_area + ofs;
3086 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3087 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3088 return virt_to_page(CAC_ADDR(vaddr));
3089 #endif
3090 #if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
3091 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
3092 dma_addr_t addr = substream->runtime->dma_addr + ofs;
3093 addr -= get_dma_offset(substream->dma_buffer.dev.dev);
3094 /* assume dma_handle set via pfn_to_phys() in
3095 * mm/dma-noncoherent.c
3096 */
3097 return pfn_to_page(addr >> PAGE_SHIFT);
3098 }
3099 #endif
3100 return virt_to_page(vaddr);
3101 }
3102
3103 /*
3104 * fault callback for mmapping a RAM page
3105 */
3106 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3107 struct vm_fault *vmf)
3108 {
3109 struct snd_pcm_substream *substream = area->vm_private_data;
3110 struct snd_pcm_runtime *runtime;
3111 unsigned long offset;
3112 struct page * page;
3113 size_t dma_bytes;
3114
3115 if (substream == NULL)
3116 return VM_FAULT_SIGBUS;
3117 runtime = substream->runtime;
3118 offset = vmf->pgoff << PAGE_SHIFT;
3119 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3120 if (offset > dma_bytes - PAGE_SIZE)
3121 return VM_FAULT_SIGBUS;
3122 if (substream->ops->page)
3123 page = substream->ops->page(substream, offset);
3124 else
3125 page = snd_pcm_default_page_ops(substream, offset);
3126 if (!page)
3127 return VM_FAULT_SIGBUS;
3128 get_page(page);
3129 vmf->page = page;
3130 return 0;
3131 }
3132
3133 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3134 .open = snd_pcm_mmap_data_open,
3135 .close = snd_pcm_mmap_data_close,
3136 };
3137
3138 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3139 .open = snd_pcm_mmap_data_open,
3140 .close = snd_pcm_mmap_data_close,
3141 .fault = snd_pcm_mmap_data_fault,
3142 };
3143
3144 #ifndef ARCH_HAS_DMA_MMAP_COHERENT
3145 /* This should be defined / handled globally! */
3146 #ifdef CONFIG_ARM
3147 #define ARCH_HAS_DMA_MMAP_COHERENT
3148 #endif
3149 #endif
3150
3151 /*
3152 * mmap the DMA buffer on RAM
3153 */
3154 static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
3155 struct vm_area_struct *area)
3156 {
3157 area->vm_flags |= VM_RESERVED;
3158 #ifdef ARCH_HAS_DMA_MMAP_COHERENT
3159 if (!substream->ops->page &&
3160 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3161 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3162 area,
3163 substream->runtime->dma_area,
3164 substream->runtime->dma_addr,
3165 area->vm_end - area->vm_start);
3166 #elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3167 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV &&
3168 !plat_device_is_coherent(substream->dma_buffer.dev.dev))
3169 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3170 #endif /* ARCH_HAS_DMA_MMAP_COHERENT */
3171 /* mmap with fault handler */
3172 area->vm_ops = &snd_pcm_vm_ops_data_fault;
3173 return 0;
3174 }
3175
3176 /*
3177 * mmap the DMA buffer on I/O memory area
3178 */
3179 #if SNDRV_PCM_INFO_MMAP_IOMEM
3180 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3181 struct vm_area_struct *area)
3182 {
3183 long size;
3184 unsigned long offset;
3185
3186 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3187 area->vm_flags |= VM_IO;
3188 size = area->vm_end - area->vm_start;
3189 offset = area->vm_pgoff << PAGE_SHIFT;
3190 if (io_remap_pfn_range(area, area->vm_start,
3191 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
3192 size, area->vm_page_prot))
3193 return -EAGAIN;
3194 return 0;
3195 }
3196
3197 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3198 #endif /* SNDRV_PCM_INFO_MMAP */
3199
3200 /* mmap callback with pgprot_noncached */
3201 int snd_pcm_lib_mmap_noncached(struct snd_pcm_substream *substream,
3202 struct vm_area_struct *area)
3203 {
3204 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3205 return snd_pcm_default_mmap(substream, area);
3206 }
3207 EXPORT_SYMBOL(snd_pcm_lib_mmap_noncached);
3208
3209 /*
3210 * mmap DMA buffer
3211 */
3212 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3213 struct vm_area_struct *area)
3214 {
3215 struct snd_pcm_runtime *runtime;
3216 long size;
3217 unsigned long offset;
3218 size_t dma_bytes;
3219 int err;
3220
3221 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3222 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3223 return -EINVAL;
3224 } else {
3225 if (!(area->vm_flags & VM_READ))
3226 return -EINVAL;
3227 }
3228 runtime = substream->runtime;
3229 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3230 return -EBADFD;
3231 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3232 return -ENXIO;
3233 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3234 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3235 return -EINVAL;
3236 size = area->vm_end - area->vm_start;
3237 offset = area->vm_pgoff << PAGE_SHIFT;
3238 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3239 if ((size_t)size > dma_bytes)
3240 return -EINVAL;
3241 if (offset > dma_bytes - size)
3242 return -EINVAL;
3243
3244 area->vm_ops = &snd_pcm_vm_ops_data;
3245 area->vm_private_data = substream;
3246 if (substream->ops->mmap)
3247 err = substream->ops->mmap(substream, area);
3248 else
3249 err = snd_pcm_default_mmap(substream, area);
3250 if (!err)
3251 atomic_inc(&substream->mmap_count);
3252 return err;
3253 }
3254
3255 EXPORT_SYMBOL(snd_pcm_mmap_data);
3256
3257 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3258 {
3259 struct snd_pcm_file * pcm_file;
3260 struct snd_pcm_substream *substream;
3261 unsigned long offset;
3262
3263 pcm_file = file->private_data;
3264 substream = pcm_file->substream;
3265 if (PCM_RUNTIME_CHECK(substream))
3266 return -ENXIO;
3267
3268 offset = area->vm_pgoff << PAGE_SHIFT;
3269 switch (offset) {
3270 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3271 if (pcm_file->no_compat_mmap)
3272 return -ENXIO;
3273 return snd_pcm_mmap_status(substream, file, area);
3274 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3275 if (pcm_file->no_compat_mmap)
3276 return -ENXIO;
3277 return snd_pcm_mmap_control(substream, file, area);
3278 default:
3279 return snd_pcm_mmap_data(substream, file, area);
3280 }
3281 return 0;
3282 }
3283
3284 static int snd_pcm_fasync(int fd, struct file * file, int on)
3285 {
3286 struct snd_pcm_file * pcm_file;
3287 struct snd_pcm_substream *substream;
3288 struct snd_pcm_runtime *runtime;
3289
3290 pcm_file = file->private_data;
3291 substream = pcm_file->substream;
3292 if (PCM_RUNTIME_CHECK(substream))
3293 return -ENXIO;
3294 runtime = substream->runtime;
3295 return fasync_helper(fd, file, on, &runtime->fasync);
3296 }
3297
3298 /*
3299 * ioctl32 compat
3300 */
3301 #ifdef CONFIG_COMPAT
3302 #include "pcm_compat.c"
3303 #else
3304 #define snd_pcm_ioctl_compat NULL
3305 #endif
3306
3307 /*
3308 * To be removed helpers to keep binary compatibility
3309 */
3310
3311 #ifdef CONFIG_SND_SUPPORT_OLD_API
3312 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3313 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3314
3315 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3316 struct snd_pcm_hw_params_old *oparams)
3317 {
3318 unsigned int i;
3319
3320 memset(params, 0, sizeof(*params));
3321 params->flags = oparams->flags;
3322 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3323 params->masks[i].bits[0] = oparams->masks[i];
3324 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3325 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3326 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3327 params->info = oparams->info;
3328 params->msbits = oparams->msbits;
3329 params->rate_num = oparams->rate_num;
3330 params->rate_den = oparams->rate_den;
3331 params->fifo_size = oparams->fifo_size;
3332 }
3333
3334 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3335 struct snd_pcm_hw_params *params)
3336 {
3337 unsigned int i;
3338
3339 memset(oparams, 0, sizeof(*oparams));
3340 oparams->flags = params->flags;
3341 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3342 oparams->masks[i] = params->masks[i].bits[0];
3343 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3344 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3345 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3346 oparams->info = params->info;
3347 oparams->msbits = params->msbits;
3348 oparams->rate_num = params->rate_num;
3349 oparams->rate_den = params->rate_den;
3350 oparams->fifo_size = params->fifo_size;
3351 }
3352
3353 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3354 struct snd_pcm_hw_params_old __user * _oparams)
3355 {
3356 struct snd_pcm_hw_params *params;
3357 struct snd_pcm_hw_params_old *oparams = NULL;
3358 int err;
3359
3360 params = kmalloc(sizeof(*params), GFP_KERNEL);
3361 if (!params)
3362 return -ENOMEM;
3363
3364 oparams = memdup_user(_oparams, sizeof(*oparams));
3365 if (IS_ERR(oparams)) {
3366 err = PTR_ERR(oparams);
3367 goto out;
3368 }
3369 snd_pcm_hw_convert_from_old_params(params, oparams);
3370 err = snd_pcm_hw_refine(substream, params);
3371 snd_pcm_hw_convert_to_old_params(oparams, params);
3372 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3373 if (!err)
3374 err = -EFAULT;
3375 }
3376
3377 kfree(oparams);
3378 out:
3379 kfree(params);
3380 return err;
3381 }
3382
3383 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3384 struct snd_pcm_hw_params_old __user * _oparams)
3385 {
3386 struct snd_pcm_hw_params *params;
3387 struct snd_pcm_hw_params_old *oparams = NULL;
3388 int err;
3389
3390 params = kmalloc(sizeof(*params), GFP_KERNEL);
3391 if (!params)
3392 return -ENOMEM;
3393
3394 oparams = memdup_user(_oparams, sizeof(*oparams));
3395 if (IS_ERR(oparams)) {
3396 err = PTR_ERR(oparams);
3397 goto out;
3398 }
3399 snd_pcm_hw_convert_from_old_params(params, oparams);
3400 err = snd_pcm_hw_params(substream, params);
3401 snd_pcm_hw_convert_to_old_params(oparams, params);
3402 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3403 if (!err)
3404 err = -EFAULT;
3405 }
3406
3407 kfree(oparams);
3408 out:
3409 kfree(params);
3410 return err;
3411 }
3412 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3413
3414 #ifndef CONFIG_MMU
3415 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3416 unsigned long addr,
3417 unsigned long len,
3418 unsigned long pgoff,
3419 unsigned long flags)
3420 {
3421 struct snd_pcm_file *pcm_file = file->private_data;
3422 struct snd_pcm_substream *substream = pcm_file->substream;
3423 struct snd_pcm_runtime *runtime = substream->runtime;
3424 unsigned long offset = pgoff << PAGE_SHIFT;
3425
3426 switch (offset) {
3427 case SNDRV_PCM_MMAP_OFFSET_STATUS:
3428 return (unsigned long)runtime->status;
3429 case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3430 return (unsigned long)runtime->control;
3431 default:
3432 return (unsigned long)runtime->dma_area + offset;
3433 }
3434 }
3435 #else
3436 # define snd_pcm_get_unmapped_area NULL
3437 #endif
3438
3439 /*
3440 * Register section
3441 */
3442
3443 const struct file_operations snd_pcm_f_ops[2] = {
3444 {
3445 .owner = THIS_MODULE,
3446 .write = snd_pcm_write,
3447 .aio_write = snd_pcm_aio_write,
3448 .open = snd_pcm_playback_open,
3449 .release = snd_pcm_release,
3450 .llseek = no_llseek,
3451 .poll = snd_pcm_playback_poll,
3452 .unlocked_ioctl = snd_pcm_playback_ioctl,
3453 .compat_ioctl = snd_pcm_ioctl_compat,
3454 .mmap = snd_pcm_mmap,
3455 .fasync = snd_pcm_fasync,
3456 .get_unmapped_area = snd_pcm_get_unmapped_area,
3457 },
3458 {
3459 .owner = THIS_MODULE,
3460 .read = snd_pcm_read,
3461 .aio_read = snd_pcm_aio_read,
3462 .open = snd_pcm_capture_open,
3463 .release = snd_pcm_release,
3464 .llseek = no_llseek,
3465 .poll = snd_pcm_capture_poll,
3466 .unlocked_ioctl = snd_pcm_capture_ioctl,
3467 .compat_ioctl = snd_pcm_ioctl_compat,
3468 .mmap = snd_pcm_mmap,
3469 .fasync = snd_pcm_fasync,
3470 .get_unmapped_area = snd_pcm_get_unmapped_area,
3471 }
3472 };
AMDTP streaming driver for the Linux FireWire stack (Juju)