1 /*
2 * Digital Audio (PCM) abstract layer / OSS compatible
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 #if 0
23 #define PLUGIN_DEBUG
24 #endif
25 #if 0
26 #define OSS_DEBUG
27 #endif
28
29 #include <linux/init.h>
30 #include <linux/slab.h>
31 #include <linux/time.h>
32 #include <linux/vmalloc.h>
33 #include <linux/module.h>
34 #include <linux/math64.h>
35 #include <linux/string.h>
36 #include <linux/compat.h>
37 #include <sound/core.h>
38 #include <sound/minors.h>
39 #include <sound/pcm.h>
40 #include <sound/pcm_params.h>
41 #include "pcm_plugin.h"
42 #include <sound/info.h>
43 #include <linux/soundcard.h>
44 #include <sound/initval.h>
45 #include <sound/mixer_oss.h>
46
47 #define OSS_ALSAEMULVER _SIOR ('M', 249, int)
48
49 static int dsp_map[SNDRV_CARDS];
50 static int adsp_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
51 static bool nonblock_open = 1;
52
53 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
54 MODULE_DESCRIPTION("PCM OSS emulation for ALSA.");
55 MODULE_LICENSE("GPL");
56 module_param_array(dsp_map, int, NULL, 0444);
57 MODULE_PARM_DESC(dsp_map, "PCM device number assigned to 1st OSS device.");
58 module_param_array(adsp_map, int, NULL, 0444);
59 MODULE_PARM_DESC(adsp_map, "PCM device number assigned to 2nd OSS device.");
60 module_param(nonblock_open, bool, 0644);
61 MODULE_PARM_DESC(nonblock_open, "Don't block opening busy PCM devices.");
62 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_PCM);
63 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_PCM1);
64
65 static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file);
66 static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file);
67 static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file);
68
snd_enter_user(void)69 static inline mm_segment_t snd_enter_user(void)
70 {
71 mm_segment_t fs = get_fs();
72 set_fs(get_ds());
73 return fs;
74 }
75
snd_leave_user(mm_segment_t fs)76 static inline void snd_leave_user(mm_segment_t fs)
77 {
78 set_fs(fs);
79 }
80
81 /*
82 * helper functions to process hw_params
83 */
snd_interval_refine_min(struct snd_interval * i,unsigned int min,int openmin)84 static int snd_interval_refine_min(struct snd_interval *i, unsigned int min, int openmin)
85 {
86 int changed = 0;
87 if (i->min < min) {
88 i->min = min;
89 i->openmin = openmin;
90 changed = 1;
91 } else if (i->min == min && !i->openmin && openmin) {
92 i->openmin = 1;
93 changed = 1;
94 }
95 if (i->integer) {
96 if (i->openmin) {
97 i->min++;
98 i->openmin = 0;
99 }
100 }
101 if (snd_interval_checkempty(i)) {
102 snd_interval_none(i);
103 return -EINVAL;
104 }
105 return changed;
106 }
107
snd_interval_refine_max(struct snd_interval * i,unsigned int max,int openmax)108 static int snd_interval_refine_max(struct snd_interval *i, unsigned int max, int openmax)
109 {
110 int changed = 0;
111 if (i->max > max) {
112 i->max = max;
113 i->openmax = openmax;
114 changed = 1;
115 } else if (i->max == max && !i->openmax && openmax) {
116 i->openmax = 1;
117 changed = 1;
118 }
119 if (i->integer) {
120 if (i->openmax) {
121 i->max--;
122 i->openmax = 0;
123 }
124 }
125 if (snd_interval_checkempty(i)) {
126 snd_interval_none(i);
127 return -EINVAL;
128 }
129 return changed;
130 }
131
snd_interval_refine_set(struct snd_interval * i,unsigned int val)132 static int snd_interval_refine_set(struct snd_interval *i, unsigned int val)
133 {
134 struct snd_interval t;
135 t.empty = 0;
136 t.min = t.max = val;
137 t.openmin = t.openmax = 0;
138 t.integer = 1;
139 return snd_interval_refine(i, &t);
140 }
141
142 /**
143 * snd_pcm_hw_param_value_min
144 * @params: the hw_params instance
145 * @var: parameter to retrieve
146 * @dir: pointer to the direction (-1,0,1) or NULL
147 *
148 * Return the minimum value for field PAR.
149 */
150 static unsigned int
snd_pcm_hw_param_value_min(const struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,int * dir)151 snd_pcm_hw_param_value_min(const struct snd_pcm_hw_params *params,
152 snd_pcm_hw_param_t var, int *dir)
153 {
154 if (hw_is_mask(var)) {
155 if (dir)
156 *dir = 0;
157 return snd_mask_min(hw_param_mask_c(params, var));
158 }
159 if (hw_is_interval(var)) {
160 const struct snd_interval *i = hw_param_interval_c(params, var);
161 if (dir)
162 *dir = i->openmin;
163 return snd_interval_min(i);
164 }
165 return -EINVAL;
166 }
167
168 /**
169 * snd_pcm_hw_param_value_max
170 * @params: the hw_params instance
171 * @var: parameter to retrieve
172 * @dir: pointer to the direction (-1,0,1) or NULL
173 *
174 * Return the maximum value for field PAR.
175 */
176 static unsigned int
snd_pcm_hw_param_value_max(const struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,int * dir)177 snd_pcm_hw_param_value_max(const struct snd_pcm_hw_params *params,
178 snd_pcm_hw_param_t var, int *dir)
179 {
180 if (hw_is_mask(var)) {
181 if (dir)
182 *dir = 0;
183 return snd_mask_max(hw_param_mask_c(params, var));
184 }
185 if (hw_is_interval(var)) {
186 const struct snd_interval *i = hw_param_interval_c(params, var);
187 if (dir)
188 *dir = - (int) i->openmax;
189 return snd_interval_max(i);
190 }
191 return -EINVAL;
192 }
193
_snd_pcm_hw_param_mask(struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,const struct snd_mask * val)194 static int _snd_pcm_hw_param_mask(struct snd_pcm_hw_params *params,
195 snd_pcm_hw_param_t var,
196 const struct snd_mask *val)
197 {
198 int changed;
199 changed = snd_mask_refine(hw_param_mask(params, var), val);
200 if (changed) {
201 params->cmask |= 1 << var;
202 params->rmask |= 1 << var;
203 }
204 return changed;
205 }
206
snd_pcm_hw_param_mask(struct snd_pcm_substream * pcm,struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,const struct snd_mask * val)207 static int snd_pcm_hw_param_mask(struct snd_pcm_substream *pcm,
208 struct snd_pcm_hw_params *params,
209 snd_pcm_hw_param_t var,
210 const struct snd_mask *val)
211 {
212 int changed = _snd_pcm_hw_param_mask(params, var, val);
213 if (changed < 0)
214 return changed;
215 if (params->rmask) {
216 int err = snd_pcm_hw_refine(pcm, params);
217 if (err < 0)
218 return err;
219 }
220 return 0;
221 }
222
_snd_pcm_hw_param_min(struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,unsigned int val,int dir)223 static int _snd_pcm_hw_param_min(struct snd_pcm_hw_params *params,
224 snd_pcm_hw_param_t var, unsigned int val,
225 int dir)
226 {
227 int changed;
228 int open = 0;
229 if (dir) {
230 if (dir > 0) {
231 open = 1;
232 } else if (dir < 0) {
233 if (val > 0) {
234 open = 1;
235 val--;
236 }
237 }
238 }
239 if (hw_is_mask(var))
240 changed = snd_mask_refine_min(hw_param_mask(params, var),
241 val + !!open);
242 else if (hw_is_interval(var))
243 changed = snd_interval_refine_min(hw_param_interval(params, var),
244 val, open);
245 else
246 return -EINVAL;
247 if (changed) {
248 params->cmask |= 1 << var;
249 params->rmask |= 1 << var;
250 }
251 return changed;
252 }
253
254 /**
255 * snd_pcm_hw_param_min
256 * @pcm: PCM instance
257 * @params: the hw_params instance
258 * @var: parameter to retrieve
259 * @val: minimal value
260 * @dir: pointer to the direction (-1,0,1) or NULL
261 *
262 * Inside configuration space defined by PARAMS remove from PAR all
263 * values < VAL. Reduce configuration space accordingly.
264 * Return new minimum or -EINVAL if the configuration space is empty
265 */
snd_pcm_hw_param_min(struct snd_pcm_substream * pcm,struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,unsigned int val,int * dir)266 static int snd_pcm_hw_param_min(struct snd_pcm_substream *pcm,
267 struct snd_pcm_hw_params *params,
268 snd_pcm_hw_param_t var, unsigned int val,
269 int *dir)
270 {
271 int changed = _snd_pcm_hw_param_min(params, var, val, dir ? *dir : 0);
272 if (changed < 0)
273 return changed;
274 if (params->rmask) {
275 int err = snd_pcm_hw_refine(pcm, params);
276 if (err < 0)
277 return err;
278 }
279 return snd_pcm_hw_param_value_min(params, var, dir);
280 }
281
_snd_pcm_hw_param_max(struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,unsigned int val,int dir)282 static int _snd_pcm_hw_param_max(struct snd_pcm_hw_params *params,
283 snd_pcm_hw_param_t var, unsigned int val,
284 int dir)
285 {
286 int changed;
287 int open = 0;
288 if (dir) {
289 if (dir < 0) {
290 open = 1;
291 } else if (dir > 0) {
292 open = 1;
293 val++;
294 }
295 }
296 if (hw_is_mask(var)) {
297 if (val == 0 && open) {
298 snd_mask_none(hw_param_mask(params, var));
299 changed = -EINVAL;
300 } else
301 changed = snd_mask_refine_max(hw_param_mask(params, var),
302 val - !!open);
303 } else if (hw_is_interval(var))
304 changed = snd_interval_refine_max(hw_param_interval(params, var),
305 val, open);
306 else
307 return -EINVAL;
308 if (changed) {
309 params->cmask |= 1 << var;
310 params->rmask |= 1 << var;
311 }
312 return changed;
313 }
314
315 /**
316 * snd_pcm_hw_param_max
317 * @pcm: PCM instance
318 * @params: the hw_params instance
319 * @var: parameter to retrieve
320 * @val: maximal value
321 * @dir: pointer to the direction (-1,0,1) or NULL
322 *
323 * Inside configuration space defined by PARAMS remove from PAR all
324 * values >= VAL + 1. Reduce configuration space accordingly.
325 * Return new maximum or -EINVAL if the configuration space is empty
326 */
snd_pcm_hw_param_max(struct snd_pcm_substream * pcm,struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,unsigned int val,int * dir)327 static int snd_pcm_hw_param_max(struct snd_pcm_substream *pcm,
328 struct snd_pcm_hw_params *params,
329 snd_pcm_hw_param_t var, unsigned int val,
330 int *dir)
331 {
332 int changed = _snd_pcm_hw_param_max(params, var, val, dir ? *dir : 0);
333 if (changed < 0)
334 return changed;
335 if (params->rmask) {
336 int err = snd_pcm_hw_refine(pcm, params);
337 if (err < 0)
338 return err;
339 }
340 return snd_pcm_hw_param_value_max(params, var, dir);
341 }
342
boundary_sub(int a,int adir,int b,int bdir,int * c,int * cdir)343 static int boundary_sub(int a, int adir,
344 int b, int bdir,
345 int *c, int *cdir)
346 {
347 adir = adir < 0 ? -1 : (adir > 0 ? 1 : 0);
348 bdir = bdir < 0 ? -1 : (bdir > 0 ? 1 : 0);
349 *c = a - b;
350 *cdir = adir - bdir;
351 if (*cdir == -2) {
352 (*c)--;
353 } else if (*cdir == 2) {
354 (*c)++;
355 }
356 return 0;
357 }
358
boundary_lt(unsigned int a,int adir,unsigned int b,int bdir)359 static int boundary_lt(unsigned int a, int adir,
360 unsigned int b, int bdir)
361 {
362 if (adir < 0) {
363 a--;
364 adir = 1;
365 } else if (adir > 0)
366 adir = 1;
367 if (bdir < 0) {
368 b--;
369 bdir = 1;
370 } else if (bdir > 0)
371 bdir = 1;
372 return a < b || (a == b && adir < bdir);
373 }
374
375 /* Return 1 if min is nearer to best than max */
boundary_nearer(int min,int mindir,int best,int bestdir,int max,int maxdir)376 static int boundary_nearer(int min, int mindir,
377 int best, int bestdir,
378 int max, int maxdir)
379 {
380 int dmin, dmindir;
381 int dmax, dmaxdir;
382 boundary_sub(best, bestdir, min, mindir, &dmin, &dmindir);
383 boundary_sub(max, maxdir, best, bestdir, &dmax, &dmaxdir);
384 return boundary_lt(dmin, dmindir, dmax, dmaxdir);
385 }
386
387 /**
388 * snd_pcm_hw_param_near
389 * @pcm: PCM instance
390 * @params: the hw_params instance
391 * @var: parameter to retrieve
392 * @best: value to set
393 * @dir: pointer to the direction (-1,0,1) or NULL
394 *
395 * Inside configuration space defined by PARAMS set PAR to the available value
396 * nearest to VAL. Reduce configuration space accordingly.
397 * This function cannot be called for SNDRV_PCM_HW_PARAM_ACCESS,
398 * SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT.
399 * Return the value found.
400 */
snd_pcm_hw_param_near(struct snd_pcm_substream * pcm,struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,unsigned int best,int * dir)401 static int snd_pcm_hw_param_near(struct snd_pcm_substream *pcm,
402 struct snd_pcm_hw_params *params,
403 snd_pcm_hw_param_t var, unsigned int best,
404 int *dir)
405 {
406 struct snd_pcm_hw_params *save = NULL;
407 int v;
408 unsigned int saved_min;
409 int last = 0;
410 int min, max;
411 int mindir, maxdir;
412 int valdir = dir ? *dir : 0;
413 /* FIXME */
414 if (best > INT_MAX)
415 best = INT_MAX;
416 min = max = best;
417 mindir = maxdir = valdir;
418 if (maxdir > 0)
419 maxdir = 0;
420 else if (maxdir == 0)
421 maxdir = -1;
422 else {
423 maxdir = 1;
424 max--;
425 }
426 save = kmalloc(sizeof(*save), GFP_KERNEL);
427 if (save == NULL)
428 return -ENOMEM;
429 *save = *params;
430 saved_min = min;
431 min = snd_pcm_hw_param_min(pcm, params, var, min, &mindir);
432 if (min >= 0) {
433 struct snd_pcm_hw_params *params1;
434 if (max < 0)
435 goto _end;
436 if ((unsigned int)min == saved_min && mindir == valdir)
437 goto _end;
438 params1 = kmalloc(sizeof(*params1), GFP_KERNEL);
439 if (params1 == NULL) {
440 kfree(save);
441 return -ENOMEM;
442 }
443 *params1 = *save;
444 max = snd_pcm_hw_param_max(pcm, params1, var, max, &maxdir);
445 if (max < 0) {
446 kfree(params1);
447 goto _end;
448 }
449 if (boundary_nearer(max, maxdir, best, valdir, min, mindir)) {
450 *params = *params1;
451 last = 1;
452 }
453 kfree(params1);
454 } else {
455 *params = *save;
456 max = snd_pcm_hw_param_max(pcm, params, var, max, &maxdir);
457 if (max < 0) {
458 kfree(save);
459 return max;
460 }
461 last = 1;
462 }
463 _end:
464 kfree(save);
465 if (last)
466 v = snd_pcm_hw_param_last(pcm, params, var, dir);
467 else
468 v = snd_pcm_hw_param_first(pcm, params, var, dir);
469 return v;
470 }
471
_snd_pcm_hw_param_set(struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,unsigned int val,int dir)472 static int _snd_pcm_hw_param_set(struct snd_pcm_hw_params *params,
473 snd_pcm_hw_param_t var, unsigned int val,
474 int dir)
475 {
476 int changed;
477 if (hw_is_mask(var)) {
478 struct snd_mask *m = hw_param_mask(params, var);
479 if (val == 0 && dir < 0) {
480 changed = -EINVAL;
481 snd_mask_none(m);
482 } else {
483 if (dir > 0)
484 val++;
485 else if (dir < 0)
486 val--;
487 changed = snd_mask_refine_set(hw_param_mask(params, var), val);
488 }
489 } else if (hw_is_interval(var)) {
490 struct snd_interval *i = hw_param_interval(params, var);
491 if (val == 0 && dir < 0) {
492 changed = -EINVAL;
493 snd_interval_none(i);
494 } else if (dir == 0)
495 changed = snd_interval_refine_set(i, val);
496 else {
497 struct snd_interval t;
498 t.openmin = 1;
499 t.openmax = 1;
500 t.empty = 0;
501 t.integer = 0;
502 if (dir < 0) {
503 t.min = val - 1;
504 t.max = val;
505 } else {
506 t.min = val;
507 t.max = val+1;
508 }
509 changed = snd_interval_refine(i, &t);
510 }
511 } else
512 return -EINVAL;
513 if (changed) {
514 params->cmask |= 1 << var;
515 params->rmask |= 1 << var;
516 }
517 return changed;
518 }
519
520 /**
521 * snd_pcm_hw_param_set
522 * @pcm: PCM instance
523 * @params: the hw_params instance
524 * @var: parameter to retrieve
525 * @val: value to set
526 * @dir: pointer to the direction (-1,0,1) or NULL
527 *
528 * Inside configuration space defined by PARAMS remove from PAR all
529 * values != VAL. Reduce configuration space accordingly.
530 * Return VAL or -EINVAL if the configuration space is empty
531 */
snd_pcm_hw_param_set(struct snd_pcm_substream * pcm,struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,unsigned int val,int dir)532 static int snd_pcm_hw_param_set(struct snd_pcm_substream *pcm,
533 struct snd_pcm_hw_params *params,
534 snd_pcm_hw_param_t var, unsigned int val,
535 int dir)
536 {
537 int changed = _snd_pcm_hw_param_set(params, var, val, dir);
538 if (changed < 0)
539 return changed;
540 if (params->rmask) {
541 int err = snd_pcm_hw_refine(pcm, params);
542 if (err < 0)
543 return err;
544 }
545 return snd_pcm_hw_param_value(params, var, NULL);
546 }
547
_snd_pcm_hw_param_setinteger(struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var)548 static int _snd_pcm_hw_param_setinteger(struct snd_pcm_hw_params *params,
549 snd_pcm_hw_param_t var)
550 {
551 int changed;
552 changed = snd_interval_setinteger(hw_param_interval(params, var));
553 if (changed) {
554 params->cmask |= 1 << var;
555 params->rmask |= 1 << var;
556 }
557 return changed;
558 }
559
560 /*
561 * plugin
562 */
563
564 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
snd_pcm_oss_plugin_clear(struct snd_pcm_substream * substream)565 static int snd_pcm_oss_plugin_clear(struct snd_pcm_substream *substream)
566 {
567 struct snd_pcm_runtime *runtime = substream->runtime;
568 struct snd_pcm_plugin *plugin, *next;
569
570 plugin = runtime->oss.plugin_first;
571 while (plugin) {
572 next = plugin->next;
573 snd_pcm_plugin_free(plugin);
574 plugin = next;
575 }
576 runtime->oss.plugin_first = runtime->oss.plugin_last = NULL;
577 return 0;
578 }
579
snd_pcm_plugin_insert(struct snd_pcm_plugin * plugin)580 static int snd_pcm_plugin_insert(struct snd_pcm_plugin *plugin)
581 {
582 struct snd_pcm_runtime *runtime = plugin->plug->runtime;
583 plugin->next = runtime->oss.plugin_first;
584 plugin->prev = NULL;
585 if (runtime->oss.plugin_first) {
586 runtime->oss.plugin_first->prev = plugin;
587 runtime->oss.plugin_first = plugin;
588 } else {
589 runtime->oss.plugin_last =
590 runtime->oss.plugin_first = plugin;
591 }
592 return 0;
593 }
594
snd_pcm_plugin_append(struct snd_pcm_plugin * plugin)595 int snd_pcm_plugin_append(struct snd_pcm_plugin *plugin)
596 {
597 struct snd_pcm_runtime *runtime = plugin->plug->runtime;
598 plugin->next = NULL;
599 plugin->prev = runtime->oss.plugin_last;
600 if (runtime->oss.plugin_last) {
601 runtime->oss.plugin_last->next = plugin;
602 runtime->oss.plugin_last = plugin;
603 } else {
604 runtime->oss.plugin_last =
605 runtime->oss.plugin_first = plugin;
606 }
607 return 0;
608 }
609 #endif /* CONFIG_SND_PCM_OSS_PLUGINS */
610
snd_pcm_oss_bytes(struct snd_pcm_substream * substream,long frames)611 static long snd_pcm_oss_bytes(struct snd_pcm_substream *substream, long frames)
612 {
613 struct snd_pcm_runtime *runtime = substream->runtime;
614 long buffer_size = snd_pcm_lib_buffer_bytes(substream);
615 long bytes = frames_to_bytes(runtime, frames);
616 if (buffer_size == runtime->oss.buffer_bytes)
617 return bytes;
618 #if BITS_PER_LONG >= 64
619 return runtime->oss.buffer_bytes * bytes / buffer_size;
620 #else
621 {
622 u64 bsize = (u64)runtime->oss.buffer_bytes * (u64)bytes;
623 return div_u64(bsize, buffer_size);
624 }
625 #endif
626 }
627
snd_pcm_alsa_frames(struct snd_pcm_substream * substream,long bytes)628 static long snd_pcm_alsa_frames(struct snd_pcm_substream *substream, long bytes)
629 {
630 struct snd_pcm_runtime *runtime = substream->runtime;
631 long buffer_size = snd_pcm_lib_buffer_bytes(substream);
632 if (buffer_size == runtime->oss.buffer_bytes)
633 return bytes_to_frames(runtime, bytes);
634 return bytes_to_frames(runtime, (buffer_size * bytes) / runtime->oss.buffer_bytes);
635 }
636
637 static inline
get_hw_ptr_period(struct snd_pcm_runtime * runtime)638 snd_pcm_uframes_t get_hw_ptr_period(struct snd_pcm_runtime *runtime)
639 {
640 return runtime->hw_ptr_interrupt;
641 }
642
643 /* define extended formats in the recent OSS versions (if any) */
644 /* linear formats */
645 #define AFMT_S32_LE 0x00001000
646 #define AFMT_S32_BE 0x00002000
647 #define AFMT_S24_LE 0x00008000
648 #define AFMT_S24_BE 0x00010000
649 #define AFMT_S24_PACKED 0x00040000
650
651 /* other supported formats */
652 #define AFMT_FLOAT 0x00004000
653 #define AFMT_SPDIF_RAW 0x00020000
654
655 /* unsupported formats */
656 #define AFMT_AC3 0x00000400
657 #define AFMT_VORBIS 0x00000800
658
snd_pcm_oss_format_from(int format)659 static snd_pcm_format_t snd_pcm_oss_format_from(int format)
660 {
661 switch (format) {
662 case AFMT_MU_LAW: return SNDRV_PCM_FORMAT_MU_LAW;
663 case AFMT_A_LAW: return SNDRV_PCM_FORMAT_A_LAW;
664 case AFMT_IMA_ADPCM: return SNDRV_PCM_FORMAT_IMA_ADPCM;
665 case AFMT_U8: return SNDRV_PCM_FORMAT_U8;
666 case AFMT_S16_LE: return SNDRV_PCM_FORMAT_S16_LE;
667 case AFMT_S16_BE: return SNDRV_PCM_FORMAT_S16_BE;
668 case AFMT_S8: return SNDRV_PCM_FORMAT_S8;
669 case AFMT_U16_LE: return SNDRV_PCM_FORMAT_U16_LE;
670 case AFMT_U16_BE: return SNDRV_PCM_FORMAT_U16_BE;
671 case AFMT_MPEG: return SNDRV_PCM_FORMAT_MPEG;
672 case AFMT_S32_LE: return SNDRV_PCM_FORMAT_S32_LE;
673 case AFMT_S32_BE: return SNDRV_PCM_FORMAT_S32_BE;
674 case AFMT_S24_LE: return SNDRV_PCM_FORMAT_S24_LE;
675 case AFMT_S24_BE: return SNDRV_PCM_FORMAT_S24_BE;
676 case AFMT_S24_PACKED: return SNDRV_PCM_FORMAT_S24_3LE;
677 case AFMT_FLOAT: return SNDRV_PCM_FORMAT_FLOAT;
678 case AFMT_SPDIF_RAW: return SNDRV_PCM_FORMAT_IEC958_SUBFRAME;
679 default: return SNDRV_PCM_FORMAT_U8;
680 }
681 }
682
snd_pcm_oss_format_to(snd_pcm_format_t format)683 static int snd_pcm_oss_format_to(snd_pcm_format_t format)
684 {
685 switch (format) {
686 case SNDRV_PCM_FORMAT_MU_LAW: return AFMT_MU_LAW;
687 case SNDRV_PCM_FORMAT_A_LAW: return AFMT_A_LAW;
688 case SNDRV_PCM_FORMAT_IMA_ADPCM: return AFMT_IMA_ADPCM;
689 case SNDRV_PCM_FORMAT_U8: return AFMT_U8;
690 case SNDRV_PCM_FORMAT_S16_LE: return AFMT_S16_LE;
691 case SNDRV_PCM_FORMAT_S16_BE: return AFMT_S16_BE;
692 case SNDRV_PCM_FORMAT_S8: return AFMT_S8;
693 case SNDRV_PCM_FORMAT_U16_LE: return AFMT_U16_LE;
694 case SNDRV_PCM_FORMAT_U16_BE: return AFMT_U16_BE;
695 case SNDRV_PCM_FORMAT_MPEG: return AFMT_MPEG;
696 case SNDRV_PCM_FORMAT_S32_LE: return AFMT_S32_LE;
697 case SNDRV_PCM_FORMAT_S32_BE: return AFMT_S32_BE;
698 case SNDRV_PCM_FORMAT_S24_LE: return AFMT_S24_LE;
699 case SNDRV_PCM_FORMAT_S24_BE: return AFMT_S24_BE;
700 case SNDRV_PCM_FORMAT_S24_3LE: return AFMT_S24_PACKED;
701 case SNDRV_PCM_FORMAT_FLOAT: return AFMT_FLOAT;
702 case SNDRV_PCM_FORMAT_IEC958_SUBFRAME: return AFMT_SPDIF_RAW;
703 default: return -EINVAL;
704 }
705 }
706
snd_pcm_oss_period_size(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * oss_params,struct snd_pcm_hw_params * slave_params)707 static int snd_pcm_oss_period_size(struct snd_pcm_substream *substream,
708 struct snd_pcm_hw_params *oss_params,
709 struct snd_pcm_hw_params *slave_params)
710 {
711 size_t s;
712 size_t oss_buffer_size, oss_period_size, oss_periods;
713 size_t min_period_size, max_period_size;
714 struct snd_pcm_runtime *runtime = substream->runtime;
715 size_t oss_frame_size;
716
717 oss_frame_size = snd_pcm_format_physical_width(params_format(oss_params)) *
718 params_channels(oss_params) / 8;
719
720 oss_buffer_size = snd_pcm_plug_client_size(substream,
721 snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, NULL)) * oss_frame_size;
722 oss_buffer_size = rounddown_pow_of_two(oss_buffer_size);
723 if (atomic_read(&substream->mmap_count)) {
724 if (oss_buffer_size > runtime->oss.mmap_bytes)
725 oss_buffer_size = runtime->oss.mmap_bytes;
726 }
727
728 if (substream->oss.setup.period_size > 16)
729 oss_period_size = substream->oss.setup.period_size;
730 else if (runtime->oss.fragshift) {
731 oss_period_size = 1 << runtime->oss.fragshift;
732 if (oss_period_size > oss_buffer_size / 2)
733 oss_period_size = oss_buffer_size / 2;
734 } else {
735 int sd;
736 size_t bytes_per_sec = params_rate(oss_params) * snd_pcm_format_physical_width(params_format(oss_params)) * params_channels(oss_params) / 8;
737
738 oss_period_size = oss_buffer_size;
739 do {
740 oss_period_size /= 2;
741 } while (oss_period_size > bytes_per_sec);
742 if (runtime->oss.subdivision == 0) {
743 sd = 4;
744 if (oss_period_size / sd > 4096)
745 sd *= 2;
746 if (oss_period_size / sd < 4096)
747 sd = 1;
748 } else
749 sd = runtime->oss.subdivision;
750 oss_period_size /= sd;
751 if (oss_period_size < 16)
752 oss_period_size = 16;
753 }
754
755 min_period_size = snd_pcm_plug_client_size(substream,
756 snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL));
757 min_period_size *= oss_frame_size;
758 min_period_size = roundup_pow_of_two(min_period_size);
759 if (oss_period_size < min_period_size)
760 oss_period_size = min_period_size;
761
762 max_period_size = snd_pcm_plug_client_size(substream,
763 snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL));
764 max_period_size *= oss_frame_size;
765 max_period_size = rounddown_pow_of_two(max_period_size);
766 if (oss_period_size > max_period_size)
767 oss_period_size = max_period_size;
768
769 oss_periods = oss_buffer_size / oss_period_size;
770
771 if (substream->oss.setup.periods > 1)
772 oss_periods = substream->oss.setup.periods;
773
774 s = snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL);
775 if (runtime->oss.maxfrags && s > runtime->oss.maxfrags)
776 s = runtime->oss.maxfrags;
777 if (oss_periods > s)
778 oss_periods = s;
779
780 s = snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL);
781 if (s < 2)
782 s = 2;
783 if (oss_periods < s)
784 oss_periods = s;
785
786 while (oss_period_size * oss_periods > oss_buffer_size)
787 oss_period_size /= 2;
788
789 if (oss_period_size < 16)
790 return -EINVAL;
791 runtime->oss.period_bytes = oss_period_size;
792 runtime->oss.period_frames = 1;
793 runtime->oss.periods = oss_periods;
794 return 0;
795 }
796
choose_rate(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,unsigned int best_rate)797 static int choose_rate(struct snd_pcm_substream *substream,
798 struct snd_pcm_hw_params *params, unsigned int best_rate)
799 {
800 struct snd_interval *it;
801 struct snd_pcm_hw_params *save;
802 unsigned int rate, prev;
803
804 save = kmalloc(sizeof(*save), GFP_KERNEL);
805 if (save == NULL)
806 return -ENOMEM;
807 *save = *params;
808 it = hw_param_interval(save, SNDRV_PCM_HW_PARAM_RATE);
809
810 /* try multiples of the best rate */
811 rate = best_rate;
812 for (;;) {
813 if (it->max < rate || (it->max == rate && it->openmax))
814 break;
815 if (it->min < rate || (it->min == rate && !it->openmin)) {
816 int ret;
817 ret = snd_pcm_hw_param_set(substream, params,
818 SNDRV_PCM_HW_PARAM_RATE,
819 rate, 0);
820 if (ret == (int)rate) {
821 kfree(save);
822 return rate;
823 }
824 *params = *save;
825 }
826 prev = rate;
827 rate += best_rate;
828 if (rate <= prev)
829 break;
830 }
831
832 /* not found, use the nearest rate */
833 kfree(save);
834 return snd_pcm_hw_param_near(substream, params, SNDRV_PCM_HW_PARAM_RATE, best_rate, NULL);
835 }
836
837 /* parameter locking: returns immediately if tried during streaming */
lock_params(struct snd_pcm_runtime * runtime)838 static int lock_params(struct snd_pcm_runtime *runtime)
839 {
840 if (mutex_lock_interruptible(&runtime->oss.params_lock))
841 return -ERESTARTSYS;
842 if (atomic_read(&runtime->oss.rw_ref)) {
843 mutex_unlock(&runtime->oss.params_lock);
844 return -EBUSY;
845 }
846 return 0;
847 }
848
unlock_params(struct snd_pcm_runtime * runtime)849 static void unlock_params(struct snd_pcm_runtime *runtime)
850 {
851 mutex_unlock(&runtime->oss.params_lock);
852 }
853
854 /* call with params_lock held */
snd_pcm_oss_change_params_locked(struct snd_pcm_substream * substream)855 static int snd_pcm_oss_change_params_locked(struct snd_pcm_substream *substream)
856 {
857 struct snd_pcm_runtime *runtime = substream->runtime;
858 struct snd_pcm_hw_params *params, *sparams;
859 struct snd_pcm_sw_params *sw_params;
860 ssize_t oss_buffer_size, oss_period_size;
861 size_t oss_frame_size;
862 int err;
863 int direct;
864 snd_pcm_format_t format, sformat;
865 int n;
866 struct snd_mask sformat_mask;
867 struct snd_mask mask;
868
869 if (!runtime->oss.params)
870 return 0;
871 sw_params = kzalloc(sizeof(*sw_params), GFP_KERNEL);
872 params = kmalloc(sizeof(*params), GFP_KERNEL);
873 sparams = kmalloc(sizeof(*sparams), GFP_KERNEL);
874 if (!sw_params || !params || !sparams) {
875 err = -ENOMEM;
876 goto failure;
877 }
878
879 if (atomic_read(&substream->mmap_count))
880 direct = 1;
881 else
882 direct = substream->oss.setup.direct;
883
884 _snd_pcm_hw_params_any(sparams);
885 _snd_pcm_hw_param_setinteger(sparams, SNDRV_PCM_HW_PARAM_PERIODS);
886 _snd_pcm_hw_param_min(sparams, SNDRV_PCM_HW_PARAM_PERIODS, 2, 0);
887 snd_mask_none(&mask);
888 if (atomic_read(&substream->mmap_count))
889 snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
890 else {
891 snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED);
892 if (!direct)
893 snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
894 }
895 err = snd_pcm_hw_param_mask(substream, sparams, SNDRV_PCM_HW_PARAM_ACCESS, &mask);
896 if (err < 0) {
897 pcm_dbg(substream->pcm, "No usable accesses\n");
898 err = -EINVAL;
899 goto failure;
900 }
901 choose_rate(substream, sparams, runtime->oss.rate);
902 snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_CHANNELS, runtime->oss.channels, NULL);
903
904 format = snd_pcm_oss_format_from(runtime->oss.format);
905
906 sformat_mask = *hw_param_mask(sparams, SNDRV_PCM_HW_PARAM_FORMAT);
907 if (direct)
908 sformat = format;
909 else
910 sformat = snd_pcm_plug_slave_format(format, &sformat_mask);
911
912 if ((__force int)sformat < 0 ||
913 !snd_mask_test(&sformat_mask, (__force int)sformat)) {
914 for (sformat = (__force snd_pcm_format_t)0;
915 (__force int)sformat <= (__force int)SNDRV_PCM_FORMAT_LAST;
916 sformat = (__force snd_pcm_format_t)((__force int)sformat + 1)) {
917 if (snd_mask_test(&sformat_mask, (__force int)sformat) &&
918 snd_pcm_oss_format_to(sformat) >= 0)
919 break;
920 }
921 if ((__force int)sformat > (__force int)SNDRV_PCM_FORMAT_LAST) {
922 pcm_dbg(substream->pcm, "Cannot find a format!!!\n");
923 err = -EINVAL;
924 goto failure;
925 }
926 }
927 err = _snd_pcm_hw_param_set(sparams, SNDRV_PCM_HW_PARAM_FORMAT, (__force int)sformat, 0);
928 if (err < 0)
929 goto failure;
930
931 if (direct) {
932 memcpy(params, sparams, sizeof(*params));
933 } else {
934 _snd_pcm_hw_params_any(params);
935 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_ACCESS,
936 (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED, 0);
937 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_FORMAT,
938 (__force int)snd_pcm_oss_format_from(runtime->oss.format), 0);
939 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_CHANNELS,
940 runtime->oss.channels, 0);
941 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_RATE,
942 runtime->oss.rate, 0);
943 pdprintf("client: access = %i, format = %i, channels = %i, rate = %i\n",
944 params_access(params), params_format(params),
945 params_channels(params), params_rate(params));
946 }
947 pdprintf("slave: access = %i, format = %i, channels = %i, rate = %i\n",
948 params_access(sparams), params_format(sparams),
949 params_channels(sparams), params_rate(sparams));
950
951 oss_frame_size = snd_pcm_format_physical_width(params_format(params)) *
952 params_channels(params) / 8;
953
954 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
955 snd_pcm_oss_plugin_clear(substream);
956 if (!direct) {
957 /* add necessary plugins */
958 snd_pcm_oss_plugin_clear(substream);
959 if ((err = snd_pcm_plug_format_plugins(substream,
960 params,
961 sparams)) < 0) {
962 pcm_dbg(substream->pcm,
963 "snd_pcm_plug_format_plugins failed: %i\n", err);
964 snd_pcm_oss_plugin_clear(substream);
965 goto failure;
966 }
967 if (runtime->oss.plugin_first) {
968 struct snd_pcm_plugin *plugin;
969 if ((err = snd_pcm_plugin_build_io(substream, sparams, &plugin)) < 0) {
970 pcm_dbg(substream->pcm,
971 "snd_pcm_plugin_build_io failed: %i\n", err);
972 snd_pcm_oss_plugin_clear(substream);
973 goto failure;
974 }
975 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
976 err = snd_pcm_plugin_append(plugin);
977 } else {
978 err = snd_pcm_plugin_insert(plugin);
979 }
980 if (err < 0) {
981 snd_pcm_oss_plugin_clear(substream);
982 goto failure;
983 }
984 }
985 }
986 #endif
987
988 err = snd_pcm_oss_period_size(substream, params, sparams);
989 if (err < 0)
990 goto failure;
991
992 n = snd_pcm_plug_slave_size(substream, runtime->oss.period_bytes / oss_frame_size);
993 err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, n, NULL);
994 if (err < 0)
995 goto failure;
996
997 err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIODS,
998 runtime->oss.periods, NULL);
999 if (err < 0)
1000 goto failure;
1001
1002 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1003
1004 if ((err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_HW_PARAMS, sparams)) < 0) {
1005 pcm_dbg(substream->pcm, "HW_PARAMS failed: %i\n", err);
1006 goto failure;
1007 }
1008
1009 if (runtime->oss.trigger) {
1010 sw_params->start_threshold = 1;
1011 } else {
1012 sw_params->start_threshold = runtime->boundary;
1013 }
1014 if (atomic_read(&substream->mmap_count) ||
1015 substream->stream == SNDRV_PCM_STREAM_CAPTURE)
1016 sw_params->stop_threshold = runtime->boundary;
1017 else
1018 sw_params->stop_threshold = runtime->buffer_size;
1019 sw_params->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
1020 sw_params->period_step = 1;
1021 sw_params->avail_min = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
1022 1 : runtime->period_size;
1023 if (atomic_read(&substream->mmap_count) ||
1024 substream->oss.setup.nosilence) {
1025 sw_params->silence_threshold = 0;
1026 sw_params->silence_size = 0;
1027 } else {
1028 snd_pcm_uframes_t frames;
1029 frames = runtime->period_size + 16;
1030 if (frames > runtime->buffer_size)
1031 frames = runtime->buffer_size;
1032 sw_params->silence_threshold = frames;
1033 sw_params->silence_size = frames;
1034 }
1035
1036 if ((err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_SW_PARAMS, sw_params)) < 0) {
1037 pcm_dbg(substream->pcm, "SW_PARAMS failed: %i\n", err);
1038 goto failure;
1039 }
1040
1041 runtime->oss.periods = params_periods(sparams);
1042 oss_period_size = snd_pcm_plug_client_size(substream, params_period_size(sparams));
1043 if (oss_period_size < 0) {
1044 err = -EINVAL;
1045 goto failure;
1046 }
1047 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1048 if (runtime->oss.plugin_first) {
1049 err = snd_pcm_plug_alloc(substream, oss_period_size);
1050 if (err < 0)
1051 goto failure;
1052 }
1053 #endif
1054 oss_period_size *= oss_frame_size;
1055
1056 oss_buffer_size = oss_period_size * runtime->oss.periods;
1057 if (oss_buffer_size < 0) {
1058 err = -EINVAL;
1059 goto failure;
1060 }
1061
1062 runtime->oss.period_bytes = oss_period_size;
1063 runtime->oss.buffer_bytes = oss_buffer_size;
1064
1065 pdprintf("oss: period bytes = %i, buffer bytes = %i\n",
1066 runtime->oss.period_bytes,
1067 runtime->oss.buffer_bytes);
1068 pdprintf("slave: period_size = %i, buffer_size = %i\n",
1069 params_period_size(sparams),
1070 params_buffer_size(sparams));
1071
1072 runtime->oss.format = snd_pcm_oss_format_to(params_format(params));
1073 runtime->oss.channels = params_channels(params);
1074 runtime->oss.rate = params_rate(params);
1075
1076 vfree(runtime->oss.buffer);
1077 runtime->oss.buffer = vmalloc(runtime->oss.period_bytes);
1078 if (!runtime->oss.buffer) {
1079 err = -ENOMEM;
1080 goto failure;
1081 }
1082
1083 runtime->oss.params = 0;
1084 runtime->oss.prepare = 1;
1085 runtime->oss.buffer_used = 0;
1086 if (runtime->dma_area)
1087 snd_pcm_format_set_silence(runtime->format, runtime->dma_area, bytes_to_samples(runtime, runtime->dma_bytes));
1088
1089 runtime->oss.period_frames = snd_pcm_alsa_frames(substream, oss_period_size);
1090
1091 err = 0;
1092 failure:
1093 kfree(sw_params);
1094 kfree(params);
1095 kfree(sparams);
1096 return err;
1097 }
1098
1099 /* this one takes the lock by itself */
snd_pcm_oss_change_params(struct snd_pcm_substream * substream,bool trylock)1100 static int snd_pcm_oss_change_params(struct snd_pcm_substream *substream,
1101 bool trylock)
1102 {
1103 struct snd_pcm_runtime *runtime = substream->runtime;
1104 int err;
1105
1106 if (trylock) {
1107 if (!(mutex_trylock(&runtime->oss.params_lock)))
1108 return -EAGAIN;
1109 } else if (mutex_lock_interruptible(&runtime->oss.params_lock))
1110 return -ERESTARTSYS;
1111
1112 err = snd_pcm_oss_change_params_locked(substream);
1113 mutex_unlock(&runtime->oss.params_lock);
1114 return err;
1115 }
1116
snd_pcm_oss_get_active_substream(struct snd_pcm_oss_file * pcm_oss_file,struct snd_pcm_substream ** r_substream)1117 static int snd_pcm_oss_get_active_substream(struct snd_pcm_oss_file *pcm_oss_file, struct snd_pcm_substream **r_substream)
1118 {
1119 int idx, err;
1120 struct snd_pcm_substream *asubstream = NULL, *substream;
1121
1122 for (idx = 0; idx < 2; idx++) {
1123 substream = pcm_oss_file->streams[idx];
1124 if (substream == NULL)
1125 continue;
1126 if (asubstream == NULL)
1127 asubstream = substream;
1128 if (substream->runtime->oss.params) {
1129 err = snd_pcm_oss_change_params(substream, false);
1130 if (err < 0)
1131 return err;
1132 }
1133 }
1134 if (!asubstream)
1135 return -EIO;
1136 if (r_substream)
1137 *r_substream = asubstream;
1138 return 0;
1139 }
1140
1141 /* call with params_lock held */
1142 /* NOTE: this always call PREPARE unconditionally no matter whether
1143 * runtime->oss.prepare is set or not
1144 */
snd_pcm_oss_prepare(struct snd_pcm_substream * substream)1145 static int snd_pcm_oss_prepare(struct snd_pcm_substream *substream)
1146 {
1147 int err;
1148 struct snd_pcm_runtime *runtime = substream->runtime;
1149
1150 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PREPARE, NULL);
1151 if (err < 0) {
1152 pcm_dbg(substream->pcm,
1153 "snd_pcm_oss_prepare: SNDRV_PCM_IOCTL_PREPARE failed\n");
1154 return err;
1155 }
1156 runtime->oss.prepare = 0;
1157 runtime->oss.prev_hw_ptr_period = 0;
1158 runtime->oss.period_ptr = 0;
1159 runtime->oss.buffer_used = 0;
1160
1161 return 0;
1162 }
1163
snd_pcm_oss_make_ready(struct snd_pcm_substream * substream)1164 static int snd_pcm_oss_make_ready(struct snd_pcm_substream *substream)
1165 {
1166 struct snd_pcm_runtime *runtime;
1167 int err;
1168
1169 runtime = substream->runtime;
1170 if (runtime->oss.params) {
1171 err = snd_pcm_oss_change_params(substream, false);
1172 if (err < 0)
1173 return err;
1174 }
1175 if (runtime->oss.prepare) {
1176 if (mutex_lock_interruptible(&runtime->oss.params_lock))
1177 return -ERESTARTSYS;
1178 err = snd_pcm_oss_prepare(substream);
1179 mutex_unlock(&runtime->oss.params_lock);
1180 if (err < 0)
1181 return err;
1182 }
1183 return 0;
1184 }
1185
1186 /* call with params_lock held */
snd_pcm_oss_make_ready_locked(struct snd_pcm_substream * substream)1187 static int snd_pcm_oss_make_ready_locked(struct snd_pcm_substream *substream)
1188 {
1189 struct snd_pcm_runtime *runtime;
1190 int err;
1191
1192 runtime = substream->runtime;
1193 if (runtime->oss.params) {
1194 err = snd_pcm_oss_change_params_locked(substream);
1195 if (err < 0)
1196 return err;
1197 }
1198 if (runtime->oss.prepare) {
1199 err = snd_pcm_oss_prepare(substream);
1200 if (err < 0)
1201 return err;
1202 }
1203 return 0;
1204 }
1205
snd_pcm_oss_capture_position_fixup(struct snd_pcm_substream * substream,snd_pcm_sframes_t * delay)1206 static int snd_pcm_oss_capture_position_fixup(struct snd_pcm_substream *substream, snd_pcm_sframes_t *delay)
1207 {
1208 struct snd_pcm_runtime *runtime;
1209 snd_pcm_uframes_t frames;
1210 int err = 0;
1211
1212 while (1) {
1213 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, delay);
1214 if (err < 0)
1215 break;
1216 runtime = substream->runtime;
1217 if (*delay <= (snd_pcm_sframes_t)runtime->buffer_size)
1218 break;
1219 /* in case of overrun, skip whole periods like OSS/Linux driver does */
1220 /* until avail(delay) <= buffer_size */
1221 frames = (*delay - runtime->buffer_size) + runtime->period_size - 1;
1222 frames /= runtime->period_size;
1223 frames *= runtime->period_size;
1224 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_FORWARD, &frames);
1225 if (err < 0)
1226 break;
1227 }
1228 return err;
1229 }
1230
snd_pcm_oss_write3(struct snd_pcm_substream * substream,const char * ptr,snd_pcm_uframes_t frames,int in_kernel)1231 snd_pcm_sframes_t snd_pcm_oss_write3(struct snd_pcm_substream *substream, const char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1232 {
1233 struct snd_pcm_runtime *runtime = substream->runtime;
1234 int ret;
1235 while (1) {
1236 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1237 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1238 #ifdef OSS_DEBUG
1239 pcm_dbg(substream->pcm,
1240 "pcm_oss: write: recovering from %s\n",
1241 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1242 "XRUN" : "SUSPEND");
1243 #endif
1244 ret = snd_pcm_oss_prepare(substream);
1245 if (ret < 0)
1246 break;
1247 }
1248 if (in_kernel) {
1249 mm_segment_t fs;
1250 fs = snd_enter_user();
1251 ret = snd_pcm_lib_write(substream, (void __force __user *)ptr, frames);
1252 snd_leave_user(fs);
1253 } else {
1254 ret = snd_pcm_lib_write(substream, (void __force __user *)ptr, frames);
1255 }
1256 if (ret != -EPIPE && ret != -ESTRPIPE)
1257 break;
1258 /* test, if we can't store new data, because the stream */
1259 /* has not been started */
1260 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED)
1261 return -EAGAIN;
1262 }
1263 return ret;
1264 }
1265
snd_pcm_oss_read3(struct snd_pcm_substream * substream,char * ptr,snd_pcm_uframes_t frames,int in_kernel)1266 snd_pcm_sframes_t snd_pcm_oss_read3(struct snd_pcm_substream *substream, char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1267 {
1268 struct snd_pcm_runtime *runtime = substream->runtime;
1269 snd_pcm_sframes_t delay;
1270 int ret;
1271 while (1) {
1272 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1273 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1274 #ifdef OSS_DEBUG
1275 pcm_dbg(substream->pcm,
1276 "pcm_oss: read: recovering from %s\n",
1277 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1278 "XRUN" : "SUSPEND");
1279 #endif
1280 ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1281 if (ret < 0)
1282 break;
1283 } else if (runtime->status->state == SNDRV_PCM_STATE_SETUP) {
1284 ret = snd_pcm_oss_prepare(substream);
1285 if (ret < 0)
1286 break;
1287 }
1288 ret = snd_pcm_oss_capture_position_fixup(substream, &delay);
1289 if (ret < 0)
1290 break;
1291 if (in_kernel) {
1292 mm_segment_t fs;
1293 fs = snd_enter_user();
1294 ret = snd_pcm_lib_read(substream, (void __force __user *)ptr, frames);
1295 snd_leave_user(fs);
1296 } else {
1297 ret = snd_pcm_lib_read(substream, (void __force __user *)ptr, frames);
1298 }
1299 if (ret == -EPIPE) {
1300 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1301 ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1302 if (ret < 0)
1303 break;
1304 }
1305 continue;
1306 }
1307 if (ret != -ESTRPIPE)
1308 break;
1309 }
1310 return ret;
1311 }
1312
snd_pcm_oss_writev3(struct snd_pcm_substream * substream,void ** bufs,snd_pcm_uframes_t frames,int in_kernel)1313 snd_pcm_sframes_t snd_pcm_oss_writev3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames, int in_kernel)
1314 {
1315 struct snd_pcm_runtime *runtime = substream->runtime;
1316 int ret;
1317 while (1) {
1318 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1319 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1320 #ifdef OSS_DEBUG
1321 pcm_dbg(substream->pcm,
1322 "pcm_oss: writev: recovering from %s\n",
1323 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1324 "XRUN" : "SUSPEND");
1325 #endif
1326 ret = snd_pcm_oss_prepare(substream);
1327 if (ret < 0)
1328 break;
1329 }
1330 if (in_kernel) {
1331 mm_segment_t fs;
1332 fs = snd_enter_user();
1333 ret = snd_pcm_lib_writev(substream, (void __user **)bufs, frames);
1334 snd_leave_user(fs);
1335 } else {
1336 ret = snd_pcm_lib_writev(substream, (void __user **)bufs, frames);
1337 }
1338 if (ret != -EPIPE && ret != -ESTRPIPE)
1339 break;
1340
1341 /* test, if we can't store new data, because the stream */
1342 /* has not been started */
1343 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED)
1344 return -EAGAIN;
1345 }
1346 return ret;
1347 }
1348
snd_pcm_oss_readv3(struct snd_pcm_substream * substream,void ** bufs,snd_pcm_uframes_t frames,int in_kernel)1349 snd_pcm_sframes_t snd_pcm_oss_readv3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames, int in_kernel)
1350 {
1351 struct snd_pcm_runtime *runtime = substream->runtime;
1352 int ret;
1353 while (1) {
1354 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1355 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1356 #ifdef OSS_DEBUG
1357 pcm_dbg(substream->pcm,
1358 "pcm_oss: readv: recovering from %s\n",
1359 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1360 "XRUN" : "SUSPEND");
1361 #endif
1362 ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1363 if (ret < 0)
1364 break;
1365 } else if (runtime->status->state == SNDRV_PCM_STATE_SETUP) {
1366 ret = snd_pcm_oss_prepare(substream);
1367 if (ret < 0)
1368 break;
1369 }
1370 if (in_kernel) {
1371 mm_segment_t fs;
1372 fs = snd_enter_user();
1373 ret = snd_pcm_lib_readv(substream, (void __user **)bufs, frames);
1374 snd_leave_user(fs);
1375 } else {
1376 ret = snd_pcm_lib_readv(substream, (void __user **)bufs, frames);
1377 }
1378 if (ret != -EPIPE && ret != -ESTRPIPE)
1379 break;
1380 }
1381 return ret;
1382 }
1383
snd_pcm_oss_write2(struct snd_pcm_substream * substream,const char * buf,size_t bytes,int in_kernel)1384 static ssize_t snd_pcm_oss_write2(struct snd_pcm_substream *substream, const char *buf, size_t bytes, int in_kernel)
1385 {
1386 struct snd_pcm_runtime *runtime = substream->runtime;
1387 snd_pcm_sframes_t frames, frames1;
1388 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1389 if (runtime->oss.plugin_first) {
1390 struct snd_pcm_plugin_channel *channels;
1391 size_t oss_frame_bytes = (runtime->oss.plugin_first->src_width * runtime->oss.plugin_first->src_format.channels) / 8;
1392 if (!in_kernel) {
1393 if (copy_from_user(runtime->oss.buffer, (const char __force __user *)buf, bytes))
1394 return -EFAULT;
1395 buf = runtime->oss.buffer;
1396 }
1397 frames = bytes / oss_frame_bytes;
1398 frames1 = snd_pcm_plug_client_channels_buf(substream, (char *)buf, frames, &channels);
1399 if (frames1 < 0)
1400 return frames1;
1401 frames1 = snd_pcm_plug_write_transfer(substream, channels, frames1);
1402 if (frames1 <= 0)
1403 return frames1;
1404 bytes = frames1 * oss_frame_bytes;
1405 } else
1406 #endif
1407 {
1408 frames = bytes_to_frames(runtime, bytes);
1409 frames1 = snd_pcm_oss_write3(substream, buf, frames, in_kernel);
1410 if (frames1 <= 0)
1411 return frames1;
1412 bytes = frames_to_bytes(runtime, frames1);
1413 }
1414 return bytes;
1415 }
1416
snd_pcm_oss_write1(struct snd_pcm_substream * substream,const char __user * buf,size_t bytes)1417 static ssize_t snd_pcm_oss_write1(struct snd_pcm_substream *substream, const char __user *buf, size_t bytes)
1418 {
1419 size_t xfer = 0;
1420 ssize_t tmp = 0;
1421 struct snd_pcm_runtime *runtime = substream->runtime;
1422
1423 if (atomic_read(&substream->mmap_count))
1424 return -ENXIO;
1425
1426 atomic_inc(&runtime->oss.rw_ref);
1427 while (bytes > 0) {
1428 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1429 tmp = -ERESTARTSYS;
1430 break;
1431 }
1432 tmp = snd_pcm_oss_make_ready_locked(substream);
1433 if (tmp < 0)
1434 goto err;
1435 if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1436 tmp = bytes;
1437 if (tmp + runtime->oss.buffer_used > runtime->oss.period_bytes)
1438 tmp = runtime->oss.period_bytes - runtime->oss.buffer_used;
1439 if (tmp > 0) {
1440 if (copy_from_user(runtime->oss.buffer + runtime->oss.buffer_used, buf, tmp)) {
1441 tmp = -EFAULT;
1442 goto err;
1443 }
1444 }
1445 runtime->oss.buffer_used += tmp;
1446 buf += tmp;
1447 bytes -= tmp;
1448 xfer += tmp;
1449 if (substream->oss.setup.partialfrag ||
1450 runtime->oss.buffer_used == runtime->oss.period_bytes) {
1451 tmp = snd_pcm_oss_write2(substream, runtime->oss.buffer + runtime->oss.period_ptr,
1452 runtime->oss.buffer_used - runtime->oss.period_ptr, 1);
1453 if (tmp <= 0)
1454 goto err;
1455 runtime->oss.bytes += tmp;
1456 runtime->oss.period_ptr += tmp;
1457 runtime->oss.period_ptr %= runtime->oss.period_bytes;
1458 if (runtime->oss.period_ptr == 0 ||
1459 runtime->oss.period_ptr == runtime->oss.buffer_used)
1460 runtime->oss.buffer_used = 0;
1461 else if ((substream->f_flags & O_NONBLOCK) != 0) {
1462 tmp = -EAGAIN;
1463 goto err;
1464 }
1465 }
1466 } else {
1467 tmp = snd_pcm_oss_write2(substream,
1468 (const char __force *)buf,
1469 runtime->oss.period_bytes, 0);
1470 if (tmp <= 0)
1471 goto err;
1472 runtime->oss.bytes += tmp;
1473 buf += tmp;
1474 bytes -= tmp;
1475 xfer += tmp;
1476 if ((substream->f_flags & O_NONBLOCK) != 0 &&
1477 tmp != runtime->oss.period_bytes)
1478 tmp = -EAGAIN;
1479 }
1480 err:
1481 mutex_unlock(&runtime->oss.params_lock);
1482 if (tmp < 0)
1483 break;
1484 if (signal_pending(current)) {
1485 tmp = -ERESTARTSYS;
1486 break;
1487 }
1488 tmp = 0;
1489 }
1490 atomic_dec(&runtime->oss.rw_ref);
1491 return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1492 }
1493
snd_pcm_oss_read2(struct snd_pcm_substream * substream,char * buf,size_t bytes,int in_kernel)1494 static ssize_t snd_pcm_oss_read2(struct snd_pcm_substream *substream, char *buf, size_t bytes, int in_kernel)
1495 {
1496 struct snd_pcm_runtime *runtime = substream->runtime;
1497 snd_pcm_sframes_t frames, frames1;
1498 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1499 char __user *final_dst = (char __force __user *)buf;
1500 if (runtime->oss.plugin_first) {
1501 struct snd_pcm_plugin_channel *channels;
1502 size_t oss_frame_bytes = (runtime->oss.plugin_last->dst_width * runtime->oss.plugin_last->dst_format.channels) / 8;
1503 if (!in_kernel)
1504 buf = runtime->oss.buffer;
1505 frames = bytes / oss_frame_bytes;
1506 frames1 = snd_pcm_plug_client_channels_buf(substream, buf, frames, &channels);
1507 if (frames1 < 0)
1508 return frames1;
1509 frames1 = snd_pcm_plug_read_transfer(substream, channels, frames1);
1510 if (frames1 <= 0)
1511 return frames1;
1512 bytes = frames1 * oss_frame_bytes;
1513 if (!in_kernel && copy_to_user(final_dst, buf, bytes))
1514 return -EFAULT;
1515 } else
1516 #endif
1517 {
1518 frames = bytes_to_frames(runtime, bytes);
1519 frames1 = snd_pcm_oss_read3(substream, buf, frames, in_kernel);
1520 if (frames1 <= 0)
1521 return frames1;
1522 bytes = frames_to_bytes(runtime, frames1);
1523 }
1524 return bytes;
1525 }
1526
snd_pcm_oss_read1(struct snd_pcm_substream * substream,char __user * buf,size_t bytes)1527 static ssize_t snd_pcm_oss_read1(struct snd_pcm_substream *substream, char __user *buf, size_t bytes)
1528 {
1529 size_t xfer = 0;
1530 ssize_t tmp = 0;
1531 struct snd_pcm_runtime *runtime = substream->runtime;
1532
1533 if (atomic_read(&substream->mmap_count))
1534 return -ENXIO;
1535
1536 atomic_inc(&runtime->oss.rw_ref);
1537 while (bytes > 0) {
1538 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1539 tmp = -ERESTARTSYS;
1540 break;
1541 }
1542 tmp = snd_pcm_oss_make_ready_locked(substream);
1543 if (tmp < 0)
1544 goto err;
1545 if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1546 if (runtime->oss.buffer_used == 0) {
1547 tmp = snd_pcm_oss_read2(substream, runtime->oss.buffer, runtime->oss.period_bytes, 1);
1548 if (tmp <= 0)
1549 goto err;
1550 runtime->oss.bytes += tmp;
1551 runtime->oss.period_ptr = tmp;
1552 runtime->oss.buffer_used = tmp;
1553 }
1554 tmp = bytes;
1555 if ((size_t) tmp > runtime->oss.buffer_used)
1556 tmp = runtime->oss.buffer_used;
1557 if (copy_to_user(buf, runtime->oss.buffer + (runtime->oss.period_ptr - runtime->oss.buffer_used), tmp)) {
1558 tmp = -EFAULT;
1559 goto err;
1560 }
1561 buf += tmp;
1562 bytes -= tmp;
1563 xfer += tmp;
1564 runtime->oss.buffer_used -= tmp;
1565 } else {
1566 tmp = snd_pcm_oss_read2(substream, (char __force *)buf,
1567 runtime->oss.period_bytes, 0);
1568 if (tmp <= 0)
1569 goto err;
1570 runtime->oss.bytes += tmp;
1571 buf += tmp;
1572 bytes -= tmp;
1573 xfer += tmp;
1574 }
1575 err:
1576 mutex_unlock(&runtime->oss.params_lock);
1577 if (tmp < 0)
1578 break;
1579 if (signal_pending(current)) {
1580 tmp = -ERESTARTSYS;
1581 break;
1582 }
1583 tmp = 0;
1584 }
1585 atomic_dec(&runtime->oss.rw_ref);
1586 return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1587 }
1588
snd_pcm_oss_reset(struct snd_pcm_oss_file * pcm_oss_file)1589 static int snd_pcm_oss_reset(struct snd_pcm_oss_file *pcm_oss_file)
1590 {
1591 struct snd_pcm_substream *substream;
1592 struct snd_pcm_runtime *runtime;
1593 int i;
1594
1595 for (i = 0; i < 2; i++) {
1596 substream = pcm_oss_file->streams[i];
1597 if (!substream)
1598 continue;
1599 runtime = substream->runtime;
1600 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1601 mutex_lock(&runtime->oss.params_lock);
1602 runtime->oss.prepare = 1;
1603 runtime->oss.buffer_used = 0;
1604 runtime->oss.prev_hw_ptr_period = 0;
1605 runtime->oss.period_ptr = 0;
1606 mutex_unlock(&runtime->oss.params_lock);
1607 }
1608 return 0;
1609 }
1610
snd_pcm_oss_post(struct snd_pcm_oss_file * pcm_oss_file)1611 static int snd_pcm_oss_post(struct snd_pcm_oss_file *pcm_oss_file)
1612 {
1613 struct snd_pcm_substream *substream;
1614 int err;
1615
1616 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1617 if (substream != NULL) {
1618 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
1619 return err;
1620 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_START, NULL);
1621 }
1622 /* note: all errors from the start action are ignored */
1623 /* OSS apps do not know, how to handle them */
1624 return 0;
1625 }
1626
snd_pcm_oss_sync1(struct snd_pcm_substream * substream,size_t size)1627 static int snd_pcm_oss_sync1(struct snd_pcm_substream *substream, size_t size)
1628 {
1629 struct snd_pcm_runtime *runtime;
1630 ssize_t result = 0;
1631 snd_pcm_state_t state;
1632 long res;
1633 wait_queue_t wait;
1634
1635 runtime = substream->runtime;
1636 init_waitqueue_entry(&wait, current);
1637 add_wait_queue(&runtime->sleep, &wait);
1638 #ifdef OSS_DEBUG
1639 pcm_dbg(substream->pcm, "sync1: size = %li\n", size);
1640 #endif
1641 while (1) {
1642 result = snd_pcm_oss_write2(substream, runtime->oss.buffer, size, 1);
1643 if (result > 0) {
1644 runtime->oss.buffer_used = 0;
1645 result = 0;
1646 break;
1647 }
1648 if (result != 0 && result != -EAGAIN)
1649 break;
1650 result = 0;
1651 set_current_state(TASK_INTERRUPTIBLE);
1652 snd_pcm_stream_lock_irq(substream);
1653 state = runtime->status->state;
1654 snd_pcm_stream_unlock_irq(substream);
1655 if (state != SNDRV_PCM_STATE_RUNNING) {
1656 set_current_state(TASK_RUNNING);
1657 break;
1658 }
1659 res = schedule_timeout(10 * HZ);
1660 if (signal_pending(current)) {
1661 result = -ERESTARTSYS;
1662 break;
1663 }
1664 if (res == 0) {
1665 pcm_err(substream->pcm,
1666 "OSS sync error - DMA timeout\n");
1667 result = -EIO;
1668 break;
1669 }
1670 }
1671 remove_wait_queue(&runtime->sleep, &wait);
1672 return result;
1673 }
1674
snd_pcm_oss_sync(struct snd_pcm_oss_file * pcm_oss_file)1675 static int snd_pcm_oss_sync(struct snd_pcm_oss_file *pcm_oss_file)
1676 {
1677 int err = 0;
1678 unsigned int saved_f_flags;
1679 struct snd_pcm_substream *substream;
1680 struct snd_pcm_runtime *runtime;
1681 snd_pcm_format_t format;
1682 unsigned long width;
1683 size_t size;
1684
1685 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1686 if (substream != NULL) {
1687 runtime = substream->runtime;
1688 if (atomic_read(&substream->mmap_count))
1689 goto __direct;
1690 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
1691 return err;
1692 atomic_inc(&runtime->oss.rw_ref);
1693 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1694 atomic_dec(&runtime->oss.rw_ref);
1695 return -ERESTARTSYS;
1696 }
1697 format = snd_pcm_oss_format_from(runtime->oss.format);
1698 width = snd_pcm_format_physical_width(format);
1699 if (runtime->oss.buffer_used > 0) {
1700 #ifdef OSS_DEBUG
1701 pcm_dbg(substream->pcm, "sync: buffer_used\n");
1702 #endif
1703 size = (8 * (runtime->oss.period_bytes - runtime->oss.buffer_used) + 7) / width;
1704 snd_pcm_format_set_silence(format,
1705 runtime->oss.buffer + runtime->oss.buffer_used,
1706 size);
1707 err = snd_pcm_oss_sync1(substream, runtime->oss.period_bytes);
1708 if (err < 0)
1709 goto unlock;
1710 } else if (runtime->oss.period_ptr > 0) {
1711 #ifdef OSS_DEBUG
1712 pcm_dbg(substream->pcm, "sync: period_ptr\n");
1713 #endif
1714 size = runtime->oss.period_bytes - runtime->oss.period_ptr;
1715 snd_pcm_format_set_silence(format,
1716 runtime->oss.buffer,
1717 size * 8 / width);
1718 err = snd_pcm_oss_sync1(substream, size);
1719 if (err < 0)
1720 goto unlock;
1721 }
1722 /*
1723 * The ALSA's period might be a bit large than OSS one.
1724 * Fill the remain portion of ALSA period with zeros.
1725 */
1726 size = runtime->control->appl_ptr % runtime->period_size;
1727 if (size > 0) {
1728 size = runtime->period_size - size;
1729 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) {
1730 size = (runtime->frame_bits * size) / 8;
1731 while (size > 0) {
1732 mm_segment_t fs;
1733 size_t size1 = size < runtime->oss.period_bytes ? size : runtime->oss.period_bytes;
1734 size -= size1;
1735 size1 *= 8;
1736 size1 /= runtime->sample_bits;
1737 snd_pcm_format_set_silence(runtime->format,
1738 runtime->oss.buffer,
1739 size1);
1740 size1 /= runtime->channels; /* frames */
1741 fs = snd_enter_user();
1742 snd_pcm_lib_write(substream, (void __force __user *)runtime->oss.buffer, size1);
1743 snd_leave_user(fs);
1744 }
1745 } else if (runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) {
1746 void __user *buffers[runtime->channels];
1747 memset(buffers, 0, runtime->channels * sizeof(void *));
1748 snd_pcm_lib_writev(substream, buffers, size);
1749 }
1750 }
1751 unlock:
1752 mutex_unlock(&runtime->oss.params_lock);
1753 atomic_dec(&runtime->oss.rw_ref);
1754 if (err < 0)
1755 return err;
1756 /*
1757 * finish sync: drain the buffer
1758 */
1759 __direct:
1760 saved_f_flags = substream->f_flags;
1761 substream->f_flags &= ~O_NONBLOCK;
1762 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1763 substream->f_flags = saved_f_flags;
1764 if (err < 0)
1765 return err;
1766 mutex_lock(&runtime->oss.params_lock);
1767 runtime->oss.prepare = 1;
1768 mutex_unlock(&runtime->oss.params_lock);
1769 }
1770
1771 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
1772 if (substream != NULL) {
1773 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
1774 return err;
1775 runtime = substream->runtime;
1776 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1777 if (err < 0)
1778 return err;
1779 mutex_lock(&runtime->oss.params_lock);
1780 runtime->oss.buffer_used = 0;
1781 runtime->oss.prepare = 1;
1782 mutex_unlock(&runtime->oss.params_lock);
1783 }
1784 return 0;
1785 }
1786
snd_pcm_oss_set_rate(struct snd_pcm_oss_file * pcm_oss_file,int rate)1787 static int snd_pcm_oss_set_rate(struct snd_pcm_oss_file *pcm_oss_file, int rate)
1788 {
1789 int idx;
1790
1791 for (idx = 1; idx >= 0; --idx) {
1792 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1793 struct snd_pcm_runtime *runtime;
1794 int err;
1795
1796 if (substream == NULL)
1797 continue;
1798 runtime = substream->runtime;
1799 if (rate < 1000)
1800 rate = 1000;
1801 else if (rate > 192000)
1802 rate = 192000;
1803 err = lock_params(runtime);
1804 if (err < 0)
1805 return err;
1806 if (runtime->oss.rate != rate) {
1807 runtime->oss.params = 1;
1808 runtime->oss.rate = rate;
1809 }
1810 unlock_params(runtime);
1811 }
1812 return snd_pcm_oss_get_rate(pcm_oss_file);
1813 }
1814
snd_pcm_oss_get_rate(struct snd_pcm_oss_file * pcm_oss_file)1815 static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file)
1816 {
1817 struct snd_pcm_substream *substream;
1818 int err;
1819
1820 if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1821 return err;
1822 return substream->runtime->oss.rate;
1823 }
1824
snd_pcm_oss_set_channels(struct snd_pcm_oss_file * pcm_oss_file,unsigned int channels)1825 static int snd_pcm_oss_set_channels(struct snd_pcm_oss_file *pcm_oss_file, unsigned int channels)
1826 {
1827 int idx;
1828 if (channels < 1)
1829 channels = 1;
1830 if (channels > 128)
1831 return -EINVAL;
1832 for (idx = 1; idx >= 0; --idx) {
1833 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1834 struct snd_pcm_runtime *runtime;
1835 int err;
1836
1837 if (substream == NULL)
1838 continue;
1839 runtime = substream->runtime;
1840 err = lock_params(runtime);
1841 if (err < 0)
1842 return err;
1843 if (runtime->oss.channels != channels) {
1844 runtime->oss.params = 1;
1845 runtime->oss.channels = channels;
1846 }
1847 unlock_params(runtime);
1848 }
1849 return snd_pcm_oss_get_channels(pcm_oss_file);
1850 }
1851
snd_pcm_oss_get_channels(struct snd_pcm_oss_file * pcm_oss_file)1852 static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file)
1853 {
1854 struct snd_pcm_substream *substream;
1855 int err;
1856
1857 if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1858 return err;
1859 return substream->runtime->oss.channels;
1860 }
1861
snd_pcm_oss_get_block_size(struct snd_pcm_oss_file * pcm_oss_file)1862 static int snd_pcm_oss_get_block_size(struct snd_pcm_oss_file *pcm_oss_file)
1863 {
1864 struct snd_pcm_substream *substream;
1865 int err;
1866
1867 if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1868 return err;
1869 return substream->runtime->oss.period_bytes;
1870 }
1871
snd_pcm_oss_get_formats(struct snd_pcm_oss_file * pcm_oss_file)1872 static int snd_pcm_oss_get_formats(struct snd_pcm_oss_file *pcm_oss_file)
1873 {
1874 struct snd_pcm_substream *substream;
1875 int err;
1876 int direct;
1877 struct snd_pcm_hw_params *params;
1878 unsigned int formats = 0;
1879 struct snd_mask format_mask;
1880 int fmt;
1881
1882 if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1883 return err;
1884 if (atomic_read(&substream->mmap_count))
1885 direct = 1;
1886 else
1887 direct = substream->oss.setup.direct;
1888 if (!direct)
1889 return AFMT_MU_LAW | AFMT_U8 |
1890 AFMT_S16_LE | AFMT_S16_BE |
1891 AFMT_S8 | AFMT_U16_LE |
1892 AFMT_U16_BE |
1893 AFMT_S32_LE | AFMT_S32_BE |
1894 AFMT_S24_LE | AFMT_S24_BE |
1895 AFMT_S24_PACKED;
1896 params = kmalloc(sizeof(*params), GFP_KERNEL);
1897 if (!params)
1898 return -ENOMEM;
1899 _snd_pcm_hw_params_any(params);
1900 err = snd_pcm_hw_refine(substream, params);
1901 if (err < 0)
1902 goto error;
1903 format_mask = *hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1904 for (fmt = 0; fmt < 32; ++fmt) {
1905 if (snd_mask_test(&format_mask, fmt)) {
1906 int f = snd_pcm_oss_format_to(fmt);
1907 if (f >= 0)
1908 formats |= f;
1909 }
1910 }
1911
1912 error:
1913 kfree(params);
1914 return err < 0 ? err : formats;
1915 }
1916
snd_pcm_oss_set_format(struct snd_pcm_oss_file * pcm_oss_file,int format)1917 static int snd_pcm_oss_set_format(struct snd_pcm_oss_file *pcm_oss_file, int format)
1918 {
1919 int formats, idx;
1920 int err;
1921
1922 if (format != AFMT_QUERY) {
1923 formats = snd_pcm_oss_get_formats(pcm_oss_file);
1924 if (formats < 0)
1925 return formats;
1926 if (!(formats & format))
1927 format = AFMT_U8;
1928 for (idx = 1; idx >= 0; --idx) {
1929 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1930 struct snd_pcm_runtime *runtime;
1931 if (substream == NULL)
1932 continue;
1933 runtime = substream->runtime;
1934 err = lock_params(runtime);
1935 if (err < 0)
1936 return err;
1937 if (runtime->oss.format != format) {
1938 runtime->oss.params = 1;
1939 runtime->oss.format = format;
1940 }
1941 unlock_params(runtime);
1942 }
1943 }
1944 return snd_pcm_oss_get_format(pcm_oss_file);
1945 }
1946
snd_pcm_oss_get_format(struct snd_pcm_oss_file * pcm_oss_file)1947 static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file)
1948 {
1949 struct snd_pcm_substream *substream;
1950 int err;
1951
1952 if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1953 return err;
1954 return substream->runtime->oss.format;
1955 }
1956
snd_pcm_oss_set_subdivide1(struct snd_pcm_substream * substream,int subdivide)1957 static int snd_pcm_oss_set_subdivide1(struct snd_pcm_substream *substream, int subdivide)
1958 {
1959 struct snd_pcm_runtime *runtime;
1960
1961 runtime = substream->runtime;
1962 if (subdivide == 0) {
1963 subdivide = runtime->oss.subdivision;
1964 if (subdivide == 0)
1965 subdivide = 1;
1966 return subdivide;
1967 }
1968 if (runtime->oss.subdivision || runtime->oss.fragshift)
1969 return -EINVAL;
1970 if (subdivide != 1 && subdivide != 2 && subdivide != 4 &&
1971 subdivide != 8 && subdivide != 16)
1972 return -EINVAL;
1973 runtime->oss.subdivision = subdivide;
1974 runtime->oss.params = 1;
1975 return subdivide;
1976 }
1977
snd_pcm_oss_set_subdivide(struct snd_pcm_oss_file * pcm_oss_file,int subdivide)1978 static int snd_pcm_oss_set_subdivide(struct snd_pcm_oss_file *pcm_oss_file, int subdivide)
1979 {
1980 int err = -EINVAL, idx;
1981
1982 for (idx = 1; idx >= 0; --idx) {
1983 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1984 struct snd_pcm_runtime *runtime;
1985
1986 if (substream == NULL)
1987 continue;
1988 runtime = substream->runtime;
1989 err = lock_params(runtime);
1990 if (err < 0)
1991 return err;
1992 err = snd_pcm_oss_set_subdivide1(substream, subdivide);
1993 unlock_params(runtime);
1994 if (err < 0)
1995 return err;
1996 }
1997 return err;
1998 }
1999
snd_pcm_oss_set_fragment1(struct snd_pcm_substream * substream,unsigned int val)2000 static int snd_pcm_oss_set_fragment1(struct snd_pcm_substream *substream, unsigned int val)
2001 {
2002 struct snd_pcm_runtime *runtime;
2003
2004 runtime = substream->runtime;
2005 if (runtime->oss.subdivision || runtime->oss.fragshift)
2006 return -EINVAL;
2007 runtime->oss.fragshift = val & 0xffff;
2008 runtime->oss.maxfrags = (val >> 16) & 0xffff;
2009 if (runtime->oss.fragshift < 4) /* < 16 */
2010 runtime->oss.fragshift = 4;
2011 if (runtime->oss.maxfrags < 2)
2012 runtime->oss.maxfrags = 2;
2013 runtime->oss.params = 1;
2014 return 0;
2015 }
2016
snd_pcm_oss_set_fragment(struct snd_pcm_oss_file * pcm_oss_file,unsigned int val)2017 static int snd_pcm_oss_set_fragment(struct snd_pcm_oss_file *pcm_oss_file, unsigned int val)
2018 {
2019 int err = -EINVAL, idx;
2020
2021 for (idx = 1; idx >= 0; --idx) {
2022 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
2023 struct snd_pcm_runtime *runtime;
2024
2025 if (substream == NULL)
2026 continue;
2027 runtime = substream->runtime;
2028 err = lock_params(runtime);
2029 if (err < 0)
2030 return err;
2031 err = snd_pcm_oss_set_fragment1(substream, val);
2032 unlock_params(runtime);
2033 if (err < 0)
2034 return err;
2035 }
2036 return err;
2037 }
2038
snd_pcm_oss_nonblock(struct file * file)2039 static int snd_pcm_oss_nonblock(struct file * file)
2040 {
2041 spin_lock(&file->f_lock);
2042 file->f_flags |= O_NONBLOCK;
2043 spin_unlock(&file->f_lock);
2044 return 0;
2045 }
2046
snd_pcm_oss_get_caps1(struct snd_pcm_substream * substream,int res)2047 static int snd_pcm_oss_get_caps1(struct snd_pcm_substream *substream, int res)
2048 {
2049
2050 if (substream == NULL) {
2051 res &= ~DSP_CAP_DUPLEX;
2052 return res;
2053 }
2054 #ifdef DSP_CAP_MULTI
2055 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2056 if (substream->pstr->substream_count > 1)
2057 res |= DSP_CAP_MULTI;
2058 #endif
2059 /* DSP_CAP_REALTIME is set all times: */
2060 /* all ALSA drivers can return actual pointer in ring buffer */
2061 #if defined(DSP_CAP_REALTIME) && 0
2062 {
2063 struct snd_pcm_runtime *runtime = substream->runtime;
2064 if (runtime->info & (SNDRV_PCM_INFO_BLOCK_TRANSFER|SNDRV_PCM_INFO_BATCH))
2065 res &= ~DSP_CAP_REALTIME;
2066 }
2067 #endif
2068 return res;
2069 }
2070
snd_pcm_oss_get_caps(struct snd_pcm_oss_file * pcm_oss_file)2071 static int snd_pcm_oss_get_caps(struct snd_pcm_oss_file *pcm_oss_file)
2072 {
2073 int result, idx;
2074
2075 result = DSP_CAP_TRIGGER | DSP_CAP_MMAP | DSP_CAP_DUPLEX | DSP_CAP_REALTIME;
2076 for (idx = 0; idx < 2; idx++) {
2077 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
2078 result = snd_pcm_oss_get_caps1(substream, result);
2079 }
2080 result |= 0x0001; /* revision - same as SB AWE 64 */
2081 return result;
2082 }
2083
snd_pcm_oss_simulate_fill(struct snd_pcm_substream * substream,snd_pcm_uframes_t hw_ptr)2084 static void snd_pcm_oss_simulate_fill(struct snd_pcm_substream *substream,
2085 snd_pcm_uframes_t hw_ptr)
2086 {
2087 struct snd_pcm_runtime *runtime = substream->runtime;
2088 snd_pcm_uframes_t appl_ptr;
2089 appl_ptr = hw_ptr + runtime->buffer_size;
2090 appl_ptr %= runtime->boundary;
2091 runtime->control->appl_ptr = appl_ptr;
2092 }
2093
snd_pcm_oss_set_trigger(struct snd_pcm_oss_file * pcm_oss_file,int trigger)2094 static int snd_pcm_oss_set_trigger(struct snd_pcm_oss_file *pcm_oss_file, int trigger)
2095 {
2096 struct snd_pcm_runtime *runtime;
2097 struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2098 int err, cmd;
2099
2100 #ifdef OSS_DEBUG
2101 pcm_dbg(substream->pcm, "pcm_oss: trigger = 0x%x\n", trigger);
2102 #endif
2103
2104 psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2105 csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2106
2107 if (psubstream) {
2108 if ((err = snd_pcm_oss_make_ready(psubstream)) < 0)
2109 return err;
2110 }
2111 if (csubstream) {
2112 if ((err = snd_pcm_oss_make_ready(csubstream)) < 0)
2113 return err;
2114 }
2115 if (psubstream) {
2116 runtime = psubstream->runtime;
2117 cmd = 0;
2118 if (mutex_lock_interruptible(&runtime->oss.params_lock))
2119 return -ERESTARTSYS;
2120 if (trigger & PCM_ENABLE_OUTPUT) {
2121 if (runtime->oss.trigger)
2122 goto _skip1;
2123 if (atomic_read(&psubstream->mmap_count))
2124 snd_pcm_oss_simulate_fill(psubstream,
2125 get_hw_ptr_period(runtime));
2126 runtime->oss.trigger = 1;
2127 runtime->start_threshold = 1;
2128 cmd = SNDRV_PCM_IOCTL_START;
2129 } else {
2130 if (!runtime->oss.trigger)
2131 goto _skip1;
2132 runtime->oss.trigger = 0;
2133 runtime->start_threshold = runtime->boundary;
2134 cmd = SNDRV_PCM_IOCTL_DROP;
2135 runtime->oss.prepare = 1;
2136 }
2137 _skip1:
2138 mutex_unlock(&runtime->oss.params_lock);
2139 if (cmd) {
2140 err = snd_pcm_kernel_ioctl(psubstream, cmd, NULL);
2141 if (err < 0)
2142 return err;
2143 }
2144 }
2145 if (csubstream) {
2146 runtime = csubstream->runtime;
2147 cmd = 0;
2148 if (mutex_lock_interruptible(&runtime->oss.params_lock))
2149 return -ERESTARTSYS;
2150 if (trigger & PCM_ENABLE_INPUT) {
2151 if (runtime->oss.trigger)
2152 goto _skip2;
2153 runtime->oss.trigger = 1;
2154 runtime->start_threshold = 1;
2155 cmd = SNDRV_PCM_IOCTL_START;
2156 } else {
2157 if (!runtime->oss.trigger)
2158 goto _skip2;
2159 runtime->oss.trigger = 0;
2160 runtime->start_threshold = runtime->boundary;
2161 cmd = SNDRV_PCM_IOCTL_DROP;
2162 runtime->oss.prepare = 1;
2163 }
2164 _skip2:
2165 mutex_unlock(&runtime->oss.params_lock);
2166 if (cmd) {
2167 err = snd_pcm_kernel_ioctl(csubstream, cmd, NULL);
2168 if (err < 0)
2169 return err;
2170 }
2171 }
2172 return 0;
2173 }
2174
snd_pcm_oss_get_trigger(struct snd_pcm_oss_file * pcm_oss_file)2175 static int snd_pcm_oss_get_trigger(struct snd_pcm_oss_file *pcm_oss_file)
2176 {
2177 struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2178 int result = 0;
2179
2180 psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2181 csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2182 if (psubstream && psubstream->runtime && psubstream->runtime->oss.trigger)
2183 result |= PCM_ENABLE_OUTPUT;
2184 if (csubstream && csubstream->runtime && csubstream->runtime->oss.trigger)
2185 result |= PCM_ENABLE_INPUT;
2186 return result;
2187 }
2188
snd_pcm_oss_get_odelay(struct snd_pcm_oss_file * pcm_oss_file)2189 static int snd_pcm_oss_get_odelay(struct snd_pcm_oss_file *pcm_oss_file)
2190 {
2191 struct snd_pcm_substream *substream;
2192 struct snd_pcm_runtime *runtime;
2193 snd_pcm_sframes_t delay;
2194 int err;
2195
2196 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2197 if (substream == NULL)
2198 return -EINVAL;
2199 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
2200 return err;
2201 runtime = substream->runtime;
2202 if (runtime->oss.params || runtime->oss.prepare)
2203 return 0;
2204 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
2205 if (err == -EPIPE)
2206 delay = 0; /* hack for broken OSS applications */
2207 else if (err < 0)
2208 return err;
2209 return snd_pcm_oss_bytes(substream, delay);
2210 }
2211
snd_pcm_oss_get_ptr(struct snd_pcm_oss_file * pcm_oss_file,int stream,struct count_info __user * _info)2212 static int snd_pcm_oss_get_ptr(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct count_info __user * _info)
2213 {
2214 struct snd_pcm_substream *substream;
2215 struct snd_pcm_runtime *runtime;
2216 snd_pcm_sframes_t delay;
2217 int fixup;
2218 struct count_info info;
2219 int err;
2220
2221 if (_info == NULL)
2222 return -EFAULT;
2223 substream = pcm_oss_file->streams[stream];
2224 if (substream == NULL)
2225 return -EINVAL;
2226 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
2227 return err;
2228 runtime = substream->runtime;
2229 if (runtime->oss.params || runtime->oss.prepare) {
2230 memset(&info, 0, sizeof(info));
2231 if (copy_to_user(_info, &info, sizeof(info)))
2232 return -EFAULT;
2233 return 0;
2234 }
2235 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2236 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
2237 if (err == -EPIPE || err == -ESTRPIPE || (! err && delay < 0)) {
2238 err = 0;
2239 delay = 0;
2240 fixup = 0;
2241 } else {
2242 fixup = runtime->oss.buffer_used;
2243 }
2244 } else {
2245 err = snd_pcm_oss_capture_position_fixup(substream, &delay);
2246 fixup = -runtime->oss.buffer_used;
2247 }
2248 if (err < 0)
2249 return err;
2250 info.ptr = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr % runtime->buffer_size);
2251 if (atomic_read(&substream->mmap_count)) {
2252 snd_pcm_sframes_t n;
2253 delay = get_hw_ptr_period(runtime);
2254 n = delay - runtime->oss.prev_hw_ptr_period;
2255 if (n < 0)
2256 n += runtime->boundary;
2257 info.blocks = n / runtime->period_size;
2258 runtime->oss.prev_hw_ptr_period = delay;
2259 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2260 snd_pcm_oss_simulate_fill(substream, delay);
2261 info.bytes = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr) & INT_MAX;
2262 } else {
2263 delay = snd_pcm_oss_bytes(substream, delay);
2264 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2265 if (substream->oss.setup.buggyptr)
2266 info.blocks = (runtime->oss.buffer_bytes - delay - fixup) / runtime->oss.period_bytes;
2267 else
2268 info.blocks = (delay + fixup) / runtime->oss.period_bytes;
2269 info.bytes = (runtime->oss.bytes - delay) & INT_MAX;
2270 } else {
2271 delay += fixup;
2272 info.blocks = delay / runtime->oss.period_bytes;
2273 info.bytes = (runtime->oss.bytes + delay) & INT_MAX;
2274 }
2275 }
2276 if (copy_to_user(_info, &info, sizeof(info)))
2277 return -EFAULT;
2278 return 0;
2279 }
2280
snd_pcm_oss_get_space(struct snd_pcm_oss_file * pcm_oss_file,int stream,struct audio_buf_info __user * _info)2281 static int snd_pcm_oss_get_space(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct audio_buf_info __user *_info)
2282 {
2283 struct snd_pcm_substream *substream;
2284 struct snd_pcm_runtime *runtime;
2285 snd_pcm_sframes_t avail;
2286 int fixup;
2287 struct audio_buf_info info;
2288 int err;
2289
2290 if (_info == NULL)
2291 return -EFAULT;
2292 substream = pcm_oss_file->streams[stream];
2293 if (substream == NULL)
2294 return -EINVAL;
2295 runtime = substream->runtime;
2296
2297 if (runtime->oss.params &&
2298 (err = snd_pcm_oss_change_params(substream, false)) < 0)
2299 return err;
2300
2301 info.fragsize = runtime->oss.period_bytes;
2302 info.fragstotal = runtime->periods;
2303 if (runtime->oss.prepare) {
2304 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2305 info.bytes = runtime->oss.period_bytes * runtime->oss.periods;
2306 info.fragments = runtime->oss.periods;
2307 } else {
2308 info.bytes = 0;
2309 info.fragments = 0;
2310 }
2311 } else {
2312 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2313 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &avail);
2314 if (err == -EPIPE || err == -ESTRPIPE || (! err && avail < 0)) {
2315 avail = runtime->buffer_size;
2316 err = 0;
2317 fixup = 0;
2318 } else {
2319 avail = runtime->buffer_size - avail;
2320 fixup = -runtime->oss.buffer_used;
2321 }
2322 } else {
2323 err = snd_pcm_oss_capture_position_fixup(substream, &avail);
2324 fixup = runtime->oss.buffer_used;
2325 }
2326 if (err < 0)
2327 return err;
2328 info.bytes = snd_pcm_oss_bytes(substream, avail) + fixup;
2329 info.fragments = info.bytes / runtime->oss.period_bytes;
2330 }
2331
2332 #ifdef OSS_DEBUG
2333 pcm_dbg(substream->pcm,
2334 "pcm_oss: space: bytes = %i, fragments = %i, fragstotal = %i, fragsize = %i\n",
2335 info.bytes, info.fragments, info.fragstotal, info.fragsize);
2336 #endif
2337 if (copy_to_user(_info, &info, sizeof(info)))
2338 return -EFAULT;
2339 return 0;
2340 }
2341
snd_pcm_oss_get_mapbuf(struct snd_pcm_oss_file * pcm_oss_file,int stream,struct buffmem_desc __user * _info)2342 static int snd_pcm_oss_get_mapbuf(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct buffmem_desc __user * _info)
2343 {
2344 // it won't be probably implemented
2345 // pr_debug("TODO: snd_pcm_oss_get_mapbuf\n");
2346 return -EINVAL;
2347 }
2348
strip_task_path(const char * path)2349 static const char *strip_task_path(const char *path)
2350 {
2351 const char *ptr, *ptrl = NULL;
2352 for (ptr = path; *ptr; ptr++) {
2353 if (*ptr == '/')
2354 ptrl = ptr + 1;
2355 }
2356 return ptrl;
2357 }
2358
snd_pcm_oss_look_for_setup(struct snd_pcm * pcm,int stream,const char * task_name,struct snd_pcm_oss_setup * rsetup)2359 static void snd_pcm_oss_look_for_setup(struct snd_pcm *pcm, int stream,
2360 const char *task_name,
2361 struct snd_pcm_oss_setup *rsetup)
2362 {
2363 struct snd_pcm_oss_setup *setup;
2364
2365 mutex_lock(&pcm->streams[stream].oss.setup_mutex);
2366 do {
2367 for (setup = pcm->streams[stream].oss.setup_list; setup;
2368 setup = setup->next) {
2369 if (!strcmp(setup->task_name, task_name))
2370 goto out;
2371 }
2372 } while ((task_name = strip_task_path(task_name)) != NULL);
2373 out:
2374 if (setup)
2375 *rsetup = *setup;
2376 mutex_unlock(&pcm->streams[stream].oss.setup_mutex);
2377 }
2378
snd_pcm_oss_release_substream(struct snd_pcm_substream * substream)2379 static void snd_pcm_oss_release_substream(struct snd_pcm_substream *substream)
2380 {
2381 struct snd_pcm_runtime *runtime;
2382 runtime = substream->runtime;
2383 vfree(runtime->oss.buffer);
2384 runtime->oss.buffer = NULL;
2385 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
2386 snd_pcm_oss_plugin_clear(substream);
2387 #endif
2388 substream->oss.oss = 0;
2389 }
2390
snd_pcm_oss_init_substream(struct snd_pcm_substream * substream,struct snd_pcm_oss_setup * setup,int minor)2391 static void snd_pcm_oss_init_substream(struct snd_pcm_substream *substream,
2392 struct snd_pcm_oss_setup *setup,
2393 int minor)
2394 {
2395 struct snd_pcm_runtime *runtime;
2396
2397 substream->oss.oss = 1;
2398 substream->oss.setup = *setup;
2399 if (setup->nonblock)
2400 substream->f_flags |= O_NONBLOCK;
2401 else if (setup->block)
2402 substream->f_flags &= ~O_NONBLOCK;
2403 runtime = substream->runtime;
2404 runtime->oss.params = 1;
2405 runtime->oss.trigger = 1;
2406 runtime->oss.rate = 8000;
2407 mutex_init(&runtime->oss.params_lock);
2408 switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
2409 case SNDRV_MINOR_OSS_PCM_8:
2410 runtime->oss.format = AFMT_U8;
2411 break;
2412 case SNDRV_MINOR_OSS_PCM_16:
2413 runtime->oss.format = AFMT_S16_LE;
2414 break;
2415 default:
2416 runtime->oss.format = AFMT_MU_LAW;
2417 }
2418 runtime->oss.channels = 1;
2419 runtime->oss.fragshift = 0;
2420 runtime->oss.maxfrags = 0;
2421 runtime->oss.subdivision = 0;
2422 substream->pcm_release = snd_pcm_oss_release_substream;
2423 atomic_set(&runtime->oss.rw_ref, 0);
2424 }
2425
snd_pcm_oss_release_file(struct snd_pcm_oss_file * pcm_oss_file)2426 static int snd_pcm_oss_release_file(struct snd_pcm_oss_file *pcm_oss_file)
2427 {
2428 int cidx;
2429 if (!pcm_oss_file)
2430 return 0;
2431 for (cidx = 0; cidx < 2; ++cidx) {
2432 struct snd_pcm_substream *substream = pcm_oss_file->streams[cidx];
2433 if (substream)
2434 snd_pcm_release_substream(substream);
2435 }
2436 kfree(pcm_oss_file);
2437 return 0;
2438 }
2439
snd_pcm_oss_open_file(struct file * file,struct snd_pcm * pcm,struct snd_pcm_oss_file ** rpcm_oss_file,int minor,struct snd_pcm_oss_setup * setup)2440 static int snd_pcm_oss_open_file(struct file *file,
2441 struct snd_pcm *pcm,
2442 struct snd_pcm_oss_file **rpcm_oss_file,
2443 int minor,
2444 struct snd_pcm_oss_setup *setup)
2445 {
2446 int idx, err;
2447 struct snd_pcm_oss_file *pcm_oss_file;
2448 struct snd_pcm_substream *substream;
2449 fmode_t f_mode = file->f_mode;
2450
2451 if (rpcm_oss_file)
2452 *rpcm_oss_file = NULL;
2453
2454 pcm_oss_file = kzalloc(sizeof(*pcm_oss_file), GFP_KERNEL);
2455 if (pcm_oss_file == NULL)
2456 return -ENOMEM;
2457
2458 if ((f_mode & (FMODE_WRITE|FMODE_READ)) == (FMODE_WRITE|FMODE_READ) &&
2459 (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX))
2460 f_mode = FMODE_WRITE;
2461
2462 file->f_flags &= ~O_APPEND;
2463 for (idx = 0; idx < 2; idx++) {
2464 if (setup[idx].disable)
2465 continue;
2466 if (! pcm->streams[idx].substream_count)
2467 continue; /* no matching substream */
2468 if (idx == SNDRV_PCM_STREAM_PLAYBACK) {
2469 if (! (f_mode & FMODE_WRITE))
2470 continue;
2471 } else {
2472 if (! (f_mode & FMODE_READ))
2473 continue;
2474 }
2475 err = snd_pcm_open_substream(pcm, idx, file, &substream);
2476 if (err < 0) {
2477 snd_pcm_oss_release_file(pcm_oss_file);
2478 return err;
2479 }
2480
2481 pcm_oss_file->streams[idx] = substream;
2482 substream->file = pcm_oss_file;
2483 snd_pcm_oss_init_substream(substream, &setup[idx], minor);
2484 }
2485
2486 if (!pcm_oss_file->streams[0] && !pcm_oss_file->streams[1]) {
2487 snd_pcm_oss_release_file(pcm_oss_file);
2488 return -EINVAL;
2489 }
2490
2491 file->private_data = pcm_oss_file;
2492 if (rpcm_oss_file)
2493 *rpcm_oss_file = pcm_oss_file;
2494 return 0;
2495 }
2496
2497
snd_task_name(struct task_struct * task,char * name,size_t size)2498 static int snd_task_name(struct task_struct *task, char *name, size_t size)
2499 {
2500 unsigned int idx;
2501
2502 if (snd_BUG_ON(!task || !name || size < 2))
2503 return -EINVAL;
2504 for (idx = 0; idx < sizeof(task->comm) && idx + 1 < size; idx++)
2505 name[idx] = task->comm[idx];
2506 name[idx] = '\0';
2507 return 0;
2508 }
2509
snd_pcm_oss_open(struct inode * inode,struct file * file)2510 static int snd_pcm_oss_open(struct inode *inode, struct file *file)
2511 {
2512 int err;
2513 char task_name[32];
2514 struct snd_pcm *pcm;
2515 struct snd_pcm_oss_file *pcm_oss_file;
2516 struct snd_pcm_oss_setup setup[2];
2517 int nonblock;
2518 wait_queue_t wait;
2519
2520 err = nonseekable_open(inode, file);
2521 if (err < 0)
2522 return err;
2523
2524 pcm = snd_lookup_oss_minor_data(iminor(inode),
2525 SNDRV_OSS_DEVICE_TYPE_PCM);
2526 if (pcm == NULL) {
2527 err = -ENODEV;
2528 goto __error1;
2529 }
2530 err = snd_card_file_add(pcm->card, file);
2531 if (err < 0)
2532 goto __error1;
2533 if (!try_module_get(pcm->card->module)) {
2534 err = -EFAULT;
2535 goto __error2;
2536 }
2537 if (snd_task_name(current, task_name, sizeof(task_name)) < 0) {
2538 err = -EFAULT;
2539 goto __error;
2540 }
2541 memset(setup, 0, sizeof(setup));
2542 if (file->f_mode & FMODE_WRITE)
2543 snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_PLAYBACK,
2544 task_name, &setup[0]);
2545 if (file->f_mode & FMODE_READ)
2546 snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_CAPTURE,
2547 task_name, &setup[1]);
2548
2549 nonblock = !!(file->f_flags & O_NONBLOCK);
2550 if (!nonblock)
2551 nonblock = nonblock_open;
2552
2553 init_waitqueue_entry(&wait, current);
2554 add_wait_queue(&pcm->open_wait, &wait);
2555 mutex_lock(&pcm->open_mutex);
2556 while (1) {
2557 err = snd_pcm_oss_open_file(file, pcm, &pcm_oss_file,
2558 iminor(inode), setup);
2559 if (err >= 0)
2560 break;
2561 if (err == -EAGAIN) {
2562 if (nonblock) {
2563 err = -EBUSY;
2564 break;
2565 }
2566 } else
2567 break;
2568 set_current_state(TASK_INTERRUPTIBLE);
2569 mutex_unlock(&pcm->open_mutex);
2570 schedule();
2571 mutex_lock(&pcm->open_mutex);
2572 if (pcm->card->shutdown) {
2573 err = -ENODEV;
2574 break;
2575 }
2576 if (signal_pending(current)) {
2577 err = -ERESTARTSYS;
2578 break;
2579 }
2580 }
2581 remove_wait_queue(&pcm->open_wait, &wait);
2582 mutex_unlock(&pcm->open_mutex);
2583 if (err < 0)
2584 goto __error;
2585 snd_card_unref(pcm->card);
2586 return err;
2587
2588 __error:
2589 module_put(pcm->card->module);
2590 __error2:
2591 snd_card_file_remove(pcm->card, file);
2592 __error1:
2593 if (pcm)
2594 snd_card_unref(pcm->card);
2595 return err;
2596 }
2597
snd_pcm_oss_release(struct inode * inode,struct file * file)2598 static int snd_pcm_oss_release(struct inode *inode, struct file *file)
2599 {
2600 struct snd_pcm *pcm;
2601 struct snd_pcm_substream *substream;
2602 struct snd_pcm_oss_file *pcm_oss_file;
2603
2604 pcm_oss_file = file->private_data;
2605 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2606 if (substream == NULL)
2607 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2608 if (snd_BUG_ON(!substream))
2609 return -ENXIO;
2610 pcm = substream->pcm;
2611 if (!pcm->card->shutdown)
2612 snd_pcm_oss_sync(pcm_oss_file);
2613 mutex_lock(&pcm->open_mutex);
2614 snd_pcm_oss_release_file(pcm_oss_file);
2615 mutex_unlock(&pcm->open_mutex);
2616 wake_up(&pcm->open_wait);
2617 module_put(pcm->card->module);
2618 snd_card_file_remove(pcm->card, file);
2619 return 0;
2620 }
2621
snd_pcm_oss_ioctl(struct file * file,unsigned int cmd,unsigned long arg)2622 static long snd_pcm_oss_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2623 {
2624 struct snd_pcm_oss_file *pcm_oss_file;
2625 int __user *p = (int __user *)arg;
2626 int res;
2627
2628 pcm_oss_file = file->private_data;
2629 if (cmd == OSS_GETVERSION)
2630 return put_user(SNDRV_OSS_VERSION, p);
2631 if (cmd == OSS_ALSAEMULVER)
2632 return put_user(1, p);
2633 #if defined(CONFIG_SND_MIXER_OSS) || (defined(MODULE) && defined(CONFIG_SND_MIXER_OSS_MODULE))
2634 if (((cmd >> 8) & 0xff) == 'M') { /* mixer ioctl - for OSS compatibility */
2635 struct snd_pcm_substream *substream;
2636 int idx;
2637 for (idx = 0; idx < 2; ++idx) {
2638 substream = pcm_oss_file->streams[idx];
2639 if (substream != NULL)
2640 break;
2641 }
2642 if (snd_BUG_ON(idx >= 2))
2643 return -ENXIO;
2644 return snd_mixer_oss_ioctl_card(substream->pcm->card, cmd, arg);
2645 }
2646 #endif
2647 if (((cmd >> 8) & 0xff) != 'P')
2648 return -EINVAL;
2649 #ifdef OSS_DEBUG
2650 pr_debug("pcm_oss: ioctl = 0x%x\n", cmd);
2651 #endif
2652 switch (cmd) {
2653 case SNDCTL_DSP_RESET:
2654 return snd_pcm_oss_reset(pcm_oss_file);
2655 case SNDCTL_DSP_SYNC:
2656 return snd_pcm_oss_sync(pcm_oss_file);
2657 case SNDCTL_DSP_SPEED:
2658 if (get_user(res, p))
2659 return -EFAULT;
2660 if ((res = snd_pcm_oss_set_rate(pcm_oss_file, res))<0)
2661 return res;
2662 return put_user(res, p);
2663 case SOUND_PCM_READ_RATE:
2664 res = snd_pcm_oss_get_rate(pcm_oss_file);
2665 if (res < 0)
2666 return res;
2667 return put_user(res, p);
2668 case SNDCTL_DSP_STEREO:
2669 if (get_user(res, p))
2670 return -EFAULT;
2671 res = res > 0 ? 2 : 1;
2672 if ((res = snd_pcm_oss_set_channels(pcm_oss_file, res)) < 0)
2673 return res;
2674 return put_user(--res, p);
2675 case SNDCTL_DSP_GETBLKSIZE:
2676 res = snd_pcm_oss_get_block_size(pcm_oss_file);
2677 if (res < 0)
2678 return res;
2679 return put_user(res, p);
2680 case SNDCTL_DSP_SETFMT:
2681 if (get_user(res, p))
2682 return -EFAULT;
2683 res = snd_pcm_oss_set_format(pcm_oss_file, res);
2684 if (res < 0)
2685 return res;
2686 return put_user(res, p);
2687 case SOUND_PCM_READ_BITS:
2688 res = snd_pcm_oss_get_format(pcm_oss_file);
2689 if (res < 0)
2690 return res;
2691 return put_user(res, p);
2692 case SNDCTL_DSP_CHANNELS:
2693 if (get_user(res, p))
2694 return -EFAULT;
2695 res = snd_pcm_oss_set_channels(pcm_oss_file, res);
2696 if (res < 0)
2697 return res;
2698 return put_user(res, p);
2699 case SOUND_PCM_READ_CHANNELS:
2700 res = snd_pcm_oss_get_channels(pcm_oss_file);
2701 if (res < 0)
2702 return res;
2703 return put_user(res, p);
2704 case SOUND_PCM_WRITE_FILTER:
2705 case SOUND_PCM_READ_FILTER:
2706 return -EIO;
2707 case SNDCTL_DSP_POST:
2708 return snd_pcm_oss_post(pcm_oss_file);
2709 case SNDCTL_DSP_SUBDIVIDE:
2710 if (get_user(res, p))
2711 return -EFAULT;
2712 res = snd_pcm_oss_set_subdivide(pcm_oss_file, res);
2713 if (res < 0)
2714 return res;
2715 return put_user(res, p);
2716 case SNDCTL_DSP_SETFRAGMENT:
2717 if (get_user(res, p))
2718 return -EFAULT;
2719 return snd_pcm_oss_set_fragment(pcm_oss_file, res);
2720 case SNDCTL_DSP_GETFMTS:
2721 res = snd_pcm_oss_get_formats(pcm_oss_file);
2722 if (res < 0)
2723 return res;
2724 return put_user(res, p);
2725 case SNDCTL_DSP_GETOSPACE:
2726 case SNDCTL_DSP_GETISPACE:
2727 return snd_pcm_oss_get_space(pcm_oss_file,
2728 cmd == SNDCTL_DSP_GETISPACE ?
2729 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2730 (struct audio_buf_info __user *) arg);
2731 case SNDCTL_DSP_NONBLOCK:
2732 return snd_pcm_oss_nonblock(file);
2733 case SNDCTL_DSP_GETCAPS:
2734 res = snd_pcm_oss_get_caps(pcm_oss_file);
2735 if (res < 0)
2736 return res;
2737 return put_user(res, p);
2738 case SNDCTL_DSP_GETTRIGGER:
2739 res = snd_pcm_oss_get_trigger(pcm_oss_file);
2740 if (res < 0)
2741 return res;
2742 return put_user(res, p);
2743 case SNDCTL_DSP_SETTRIGGER:
2744 if (get_user(res, p))
2745 return -EFAULT;
2746 return snd_pcm_oss_set_trigger(pcm_oss_file, res);
2747 case SNDCTL_DSP_GETIPTR:
2748 case SNDCTL_DSP_GETOPTR:
2749 return snd_pcm_oss_get_ptr(pcm_oss_file,
2750 cmd == SNDCTL_DSP_GETIPTR ?
2751 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2752 (struct count_info __user *) arg);
2753 case SNDCTL_DSP_MAPINBUF:
2754 case SNDCTL_DSP_MAPOUTBUF:
2755 return snd_pcm_oss_get_mapbuf(pcm_oss_file,
2756 cmd == SNDCTL_DSP_MAPINBUF ?
2757 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2758 (struct buffmem_desc __user *) arg);
2759 case SNDCTL_DSP_SETSYNCRO:
2760 /* stop DMA now.. */
2761 return 0;
2762 case SNDCTL_DSP_SETDUPLEX:
2763 if (snd_pcm_oss_get_caps(pcm_oss_file) & DSP_CAP_DUPLEX)
2764 return 0;
2765 return -EIO;
2766 case SNDCTL_DSP_GETODELAY:
2767 res = snd_pcm_oss_get_odelay(pcm_oss_file);
2768 if (res < 0) {
2769 /* it's for sure, some broken apps don't check for error codes */
2770 put_user(0, p);
2771 return res;
2772 }
2773 return put_user(res, p);
2774 case SNDCTL_DSP_PROFILE:
2775 return 0; /* silently ignore */
2776 default:
2777 pr_debug("pcm_oss: unknown command = 0x%x\n", cmd);
2778 }
2779 return -EINVAL;
2780 }
2781
2782 #ifdef CONFIG_COMPAT
2783 /* all compatible */
snd_pcm_oss_ioctl_compat(struct file * file,unsigned int cmd,unsigned long arg)2784 static long snd_pcm_oss_ioctl_compat(struct file *file, unsigned int cmd,
2785 unsigned long arg)
2786 {
2787 return snd_pcm_oss_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
2788 }
2789 #else
2790 #define snd_pcm_oss_ioctl_compat NULL
2791 #endif
2792
snd_pcm_oss_read(struct file * file,char __user * buf,size_t count,loff_t * offset)2793 static ssize_t snd_pcm_oss_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
2794 {
2795 struct snd_pcm_oss_file *pcm_oss_file;
2796 struct snd_pcm_substream *substream;
2797
2798 pcm_oss_file = file->private_data;
2799 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2800 if (substream == NULL)
2801 return -ENXIO;
2802 substream->f_flags = file->f_flags & O_NONBLOCK;
2803 #ifndef OSS_DEBUG
2804 return snd_pcm_oss_read1(substream, buf, count);
2805 #else
2806 {
2807 ssize_t res = snd_pcm_oss_read1(substream, buf, count);
2808 pcm_dbg(substream->pcm,
2809 "pcm_oss: read %li bytes (returned %li bytes)\n",
2810 (long)count, (long)res);
2811 return res;
2812 }
2813 #endif
2814 }
2815
snd_pcm_oss_write(struct file * file,const char __user * buf,size_t count,loff_t * offset)2816 static ssize_t snd_pcm_oss_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
2817 {
2818 struct snd_pcm_oss_file *pcm_oss_file;
2819 struct snd_pcm_substream *substream;
2820 long result;
2821
2822 pcm_oss_file = file->private_data;
2823 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2824 if (substream == NULL)
2825 return -ENXIO;
2826 substream->f_flags = file->f_flags & O_NONBLOCK;
2827 result = snd_pcm_oss_write1(substream, buf, count);
2828 #ifdef OSS_DEBUG
2829 pcm_dbg(substream->pcm, "pcm_oss: write %li bytes (wrote %li bytes)\n",
2830 (long)count, (long)result);
2831 #endif
2832 return result;
2833 }
2834
snd_pcm_oss_playback_ready(struct snd_pcm_substream * substream)2835 static int snd_pcm_oss_playback_ready(struct snd_pcm_substream *substream)
2836 {
2837 struct snd_pcm_runtime *runtime = substream->runtime;
2838 if (atomic_read(&substream->mmap_count))
2839 return runtime->oss.prev_hw_ptr_period !=
2840 get_hw_ptr_period(runtime);
2841 else
2842 return snd_pcm_playback_avail(runtime) >=
2843 runtime->oss.period_frames;
2844 }
2845
snd_pcm_oss_capture_ready(struct snd_pcm_substream * substream)2846 static int snd_pcm_oss_capture_ready(struct snd_pcm_substream *substream)
2847 {
2848 struct snd_pcm_runtime *runtime = substream->runtime;
2849 if (atomic_read(&substream->mmap_count))
2850 return runtime->oss.prev_hw_ptr_period !=
2851 get_hw_ptr_period(runtime);
2852 else
2853 return snd_pcm_capture_avail(runtime) >=
2854 runtime->oss.period_frames;
2855 }
2856
snd_pcm_oss_poll(struct file * file,poll_table * wait)2857 static unsigned int snd_pcm_oss_poll(struct file *file, poll_table * wait)
2858 {
2859 struct snd_pcm_oss_file *pcm_oss_file;
2860 unsigned int mask;
2861 struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2862
2863 pcm_oss_file = file->private_data;
2864
2865 psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2866 csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2867
2868 mask = 0;
2869 if (psubstream != NULL) {
2870 struct snd_pcm_runtime *runtime = psubstream->runtime;
2871 poll_wait(file, &runtime->sleep, wait);
2872 snd_pcm_stream_lock_irq(psubstream);
2873 if (runtime->status->state != SNDRV_PCM_STATE_DRAINING &&
2874 (runtime->status->state != SNDRV_PCM_STATE_RUNNING ||
2875 snd_pcm_oss_playback_ready(psubstream)))
2876 mask |= POLLOUT | POLLWRNORM;
2877 snd_pcm_stream_unlock_irq(psubstream);
2878 }
2879 if (csubstream != NULL) {
2880 struct snd_pcm_runtime *runtime = csubstream->runtime;
2881 snd_pcm_state_t ostate;
2882 poll_wait(file, &runtime->sleep, wait);
2883 snd_pcm_stream_lock_irq(csubstream);
2884 if ((ostate = runtime->status->state) != SNDRV_PCM_STATE_RUNNING ||
2885 snd_pcm_oss_capture_ready(csubstream))
2886 mask |= POLLIN | POLLRDNORM;
2887 snd_pcm_stream_unlock_irq(csubstream);
2888 if (ostate != SNDRV_PCM_STATE_RUNNING && runtime->oss.trigger) {
2889 struct snd_pcm_oss_file ofile;
2890 memset(&ofile, 0, sizeof(ofile));
2891 ofile.streams[SNDRV_PCM_STREAM_CAPTURE] = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2892 runtime->oss.trigger = 0;
2893 snd_pcm_oss_set_trigger(&ofile, PCM_ENABLE_INPUT);
2894 }
2895 }
2896
2897 return mask;
2898 }
2899
snd_pcm_oss_mmap(struct file * file,struct vm_area_struct * area)2900 static int snd_pcm_oss_mmap(struct file *file, struct vm_area_struct *area)
2901 {
2902 struct snd_pcm_oss_file *pcm_oss_file;
2903 struct snd_pcm_substream *substream = NULL;
2904 struct snd_pcm_runtime *runtime;
2905 int err;
2906
2907 #ifdef OSS_DEBUG
2908 pr_debug("pcm_oss: mmap begin\n");
2909 #endif
2910 pcm_oss_file = file->private_data;
2911 switch ((area->vm_flags & (VM_READ | VM_WRITE))) {
2912 case VM_READ | VM_WRITE:
2913 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2914 if (substream)
2915 break;
2916 /* Fall through */
2917 case VM_READ:
2918 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2919 break;
2920 case VM_WRITE:
2921 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2922 break;
2923 default:
2924 return -EINVAL;
2925 }
2926 /* set VM_READ access as well to fix memset() routines that do
2927 reads before writes (to improve performance) */
2928 area->vm_flags |= VM_READ;
2929 if (substream == NULL)
2930 return -ENXIO;
2931 runtime = substream->runtime;
2932 if (!(runtime->info & SNDRV_PCM_INFO_MMAP_VALID))
2933 return -EIO;
2934 if (runtime->info & SNDRV_PCM_INFO_INTERLEAVED)
2935 runtime->access = SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2936 else
2937 return -EIO;
2938
2939 if (runtime->oss.params) {
2940 /* use mutex_trylock() for params_lock for avoiding a deadlock
2941 * between mmap_sem and params_lock taken by
2942 * copy_from/to_user() in snd_pcm_oss_write/read()
2943 */
2944 err = snd_pcm_oss_change_params(substream, true);
2945 if (err < 0)
2946 return err;
2947 }
2948 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
2949 if (runtime->oss.plugin_first != NULL)
2950 return -EIO;
2951 #endif
2952
2953 if (area->vm_pgoff != 0)
2954 return -EINVAL;
2955
2956 err = snd_pcm_mmap_data(substream, file, area);
2957 if (err < 0)
2958 return err;
2959 runtime->oss.mmap_bytes = area->vm_end - area->vm_start;
2960 runtime->silence_threshold = 0;
2961 runtime->silence_size = 0;
2962 #ifdef OSS_DEBUG
2963 pr_debug("pcm_oss: mmap ok, bytes = 0x%x\n",
2964 runtime->oss.mmap_bytes);
2965 #endif
2966 /* In mmap mode we never stop */
2967 runtime->stop_threshold = runtime->boundary;
2968
2969 return 0;
2970 }
2971
2972 #ifdef CONFIG_SND_VERBOSE_PROCFS
2973 /*
2974 * /proc interface
2975 */
2976
snd_pcm_oss_proc_read(struct snd_info_entry * entry,struct snd_info_buffer * buffer)2977 static void snd_pcm_oss_proc_read(struct snd_info_entry *entry,
2978 struct snd_info_buffer *buffer)
2979 {
2980 struct snd_pcm_str *pstr = entry->private_data;
2981 struct snd_pcm_oss_setup *setup = pstr->oss.setup_list;
2982 mutex_lock(&pstr->oss.setup_mutex);
2983 while (setup) {
2984 snd_iprintf(buffer, "%s %u %u%s%s%s%s%s%s\n",
2985 setup->task_name,
2986 setup->periods,
2987 setup->period_size,
2988 setup->disable ? " disable" : "",
2989 setup->direct ? " direct" : "",
2990 setup->block ? " block" : "",
2991 setup->nonblock ? " non-block" : "",
2992 setup->partialfrag ? " partial-frag" : "",
2993 setup->nosilence ? " no-silence" : "");
2994 setup = setup->next;
2995 }
2996 mutex_unlock(&pstr->oss.setup_mutex);
2997 }
2998
snd_pcm_oss_proc_free_setup_list(struct snd_pcm_str * pstr)2999 static void snd_pcm_oss_proc_free_setup_list(struct snd_pcm_str * pstr)
3000 {
3001 struct snd_pcm_oss_setup *setup, *setupn;
3002
3003 for (setup = pstr->oss.setup_list, pstr->oss.setup_list = NULL;
3004 setup; setup = setupn) {
3005 setupn = setup->next;
3006 kfree(setup->task_name);
3007 kfree(setup);
3008 }
3009 pstr->oss.setup_list = NULL;
3010 }
3011
snd_pcm_oss_proc_write(struct snd_info_entry * entry,struct snd_info_buffer * buffer)3012 static void snd_pcm_oss_proc_write(struct snd_info_entry *entry,
3013 struct snd_info_buffer *buffer)
3014 {
3015 struct snd_pcm_str *pstr = entry->private_data;
3016 char line[128], str[32], task_name[32];
3017 const char *ptr;
3018 int idx1;
3019 struct snd_pcm_oss_setup *setup, *setup1, template;
3020
3021 while (!snd_info_get_line(buffer, line, sizeof(line))) {
3022 mutex_lock(&pstr->oss.setup_mutex);
3023 memset(&template, 0, sizeof(template));
3024 ptr = snd_info_get_str(task_name, line, sizeof(task_name));
3025 if (!strcmp(task_name, "clear") || !strcmp(task_name, "erase")) {
3026 snd_pcm_oss_proc_free_setup_list(pstr);
3027 mutex_unlock(&pstr->oss.setup_mutex);
3028 continue;
3029 }
3030 for (setup = pstr->oss.setup_list; setup; setup = setup->next) {
3031 if (!strcmp(setup->task_name, task_name)) {
3032 template = *setup;
3033 break;
3034 }
3035 }
3036 ptr = snd_info_get_str(str, ptr, sizeof(str));
3037 template.periods = simple_strtoul(str, NULL, 10);
3038 ptr = snd_info_get_str(str, ptr, sizeof(str));
3039 template.period_size = simple_strtoul(str, NULL, 10);
3040 for (idx1 = 31; idx1 >= 0; idx1--)
3041 if (template.period_size & (1 << idx1))
3042 break;
3043 for (idx1--; idx1 >= 0; idx1--)
3044 template.period_size &= ~(1 << idx1);
3045 do {
3046 ptr = snd_info_get_str(str, ptr, sizeof(str));
3047 if (!strcmp(str, "disable")) {
3048 template.disable = 1;
3049 } else if (!strcmp(str, "direct")) {
3050 template.direct = 1;
3051 } else if (!strcmp(str, "block")) {
3052 template.block = 1;
3053 } else if (!strcmp(str, "non-block")) {
3054 template.nonblock = 1;
3055 } else if (!strcmp(str, "partial-frag")) {
3056 template.partialfrag = 1;
3057 } else if (!strcmp(str, "no-silence")) {
3058 template.nosilence = 1;
3059 } else if (!strcmp(str, "buggy-ptr")) {
3060 template.buggyptr = 1;
3061 }
3062 } while (*str);
3063 if (setup == NULL) {
3064 setup = kmalloc(sizeof(*setup), GFP_KERNEL);
3065 if (! setup) {
3066 buffer->error = -ENOMEM;
3067 mutex_unlock(&pstr->oss.setup_mutex);
3068 return;
3069 }
3070 if (pstr->oss.setup_list == NULL)
3071 pstr->oss.setup_list = setup;
3072 else {
3073 for (setup1 = pstr->oss.setup_list;
3074 setup1->next; setup1 = setup1->next);
3075 setup1->next = setup;
3076 }
3077 template.task_name = kstrdup(task_name, GFP_KERNEL);
3078 if (! template.task_name) {
3079 kfree(setup);
3080 buffer->error = -ENOMEM;
3081 mutex_unlock(&pstr->oss.setup_mutex);
3082 return;
3083 }
3084 }
3085 *setup = template;
3086 mutex_unlock(&pstr->oss.setup_mutex);
3087 }
3088 }
3089
snd_pcm_oss_proc_init(struct snd_pcm * pcm)3090 static void snd_pcm_oss_proc_init(struct snd_pcm *pcm)
3091 {
3092 int stream;
3093 for (stream = 0; stream < 2; ++stream) {
3094 struct snd_info_entry *entry;
3095 struct snd_pcm_str *pstr = &pcm->streams[stream];
3096 if (pstr->substream_count == 0)
3097 continue;
3098 if ((entry = snd_info_create_card_entry(pcm->card, "oss", pstr->proc_root)) != NULL) {
3099 entry->content = SNDRV_INFO_CONTENT_TEXT;
3100 entry->mode = S_IFREG | S_IRUGO | S_IWUSR;
3101 entry->c.text.read = snd_pcm_oss_proc_read;
3102 entry->c.text.write = snd_pcm_oss_proc_write;
3103 entry->private_data = pstr;
3104 if (snd_info_register(entry) < 0) {
3105 snd_info_free_entry(entry);
3106 entry = NULL;
3107 }
3108 }
3109 pstr->oss.proc_entry = entry;
3110 }
3111 }
3112
snd_pcm_oss_proc_done(struct snd_pcm * pcm)3113 static void snd_pcm_oss_proc_done(struct snd_pcm *pcm)
3114 {
3115 int stream;
3116 for (stream = 0; stream < 2; ++stream) {
3117 struct snd_pcm_str *pstr = &pcm->streams[stream];
3118 snd_info_free_entry(pstr->oss.proc_entry);
3119 pstr->oss.proc_entry = NULL;
3120 snd_pcm_oss_proc_free_setup_list(pstr);
3121 }
3122 }
3123 #else /* !CONFIG_SND_VERBOSE_PROCFS */
3124 #define snd_pcm_oss_proc_init(pcm)
3125 #define snd_pcm_oss_proc_done(pcm)
3126 #endif /* CONFIG_SND_VERBOSE_PROCFS */
3127
3128 /*
3129 * ENTRY functions
3130 */
3131
3132 static const struct file_operations snd_pcm_oss_f_reg =
3133 {
3134 .owner = THIS_MODULE,
3135 .read = snd_pcm_oss_read,
3136 .write = snd_pcm_oss_write,
3137 .open = snd_pcm_oss_open,
3138 .release = snd_pcm_oss_release,
3139 .llseek = no_llseek,
3140 .poll = snd_pcm_oss_poll,
3141 .unlocked_ioctl = snd_pcm_oss_ioctl,
3142 .compat_ioctl = snd_pcm_oss_ioctl_compat,
3143 .mmap = snd_pcm_oss_mmap,
3144 };
3145
register_oss_dsp(struct snd_pcm * pcm,int index)3146 static void register_oss_dsp(struct snd_pcm *pcm, int index)
3147 {
3148 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3149 pcm->card, index, &snd_pcm_oss_f_reg,
3150 pcm) < 0) {
3151 pcm_err(pcm, "unable to register OSS PCM device %i:%i\n",
3152 pcm->card->number, pcm->device);
3153 }
3154 }
3155
snd_pcm_oss_register_minor(struct snd_pcm * pcm)3156 static int snd_pcm_oss_register_minor(struct snd_pcm *pcm)
3157 {
3158 pcm->oss.reg = 0;
3159 if (dsp_map[pcm->card->number] == (int)pcm->device) {
3160 char name[128];
3161 int duplex;
3162 register_oss_dsp(pcm, 0);
3163 duplex = (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count > 0 &&
3164 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count &&
3165 !(pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX));
3166 sprintf(name, "%s%s", pcm->name, duplex ? " (DUPLEX)" : "");
3167 #ifdef SNDRV_OSS_INFO_DEV_AUDIO
3168 snd_oss_info_register(SNDRV_OSS_INFO_DEV_AUDIO,
3169 pcm->card->number,
3170 name);
3171 #endif
3172 pcm->oss.reg++;
3173 pcm->oss.reg_mask |= 1;
3174 }
3175 if (adsp_map[pcm->card->number] == (int)pcm->device) {
3176 register_oss_dsp(pcm, 1);
3177 pcm->oss.reg++;
3178 pcm->oss.reg_mask |= 2;
3179 }
3180
3181 if (pcm->oss.reg)
3182 snd_pcm_oss_proc_init(pcm);
3183
3184 return 0;
3185 }
3186
snd_pcm_oss_disconnect_minor(struct snd_pcm * pcm)3187 static int snd_pcm_oss_disconnect_minor(struct snd_pcm *pcm)
3188 {
3189 if (pcm->oss.reg) {
3190 if (pcm->oss.reg_mask & 1) {
3191 pcm->oss.reg_mask &= ~1;
3192 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3193 pcm->card, 0);
3194 }
3195 if (pcm->oss.reg_mask & 2) {
3196 pcm->oss.reg_mask &= ~2;
3197 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3198 pcm->card, 1);
3199 }
3200 if (dsp_map[pcm->card->number] == (int)pcm->device) {
3201 #ifdef SNDRV_OSS_INFO_DEV_AUDIO
3202 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_AUDIO, pcm->card->number);
3203 #endif
3204 }
3205 pcm->oss.reg = 0;
3206 }
3207 return 0;
3208 }
3209
snd_pcm_oss_unregister_minor(struct snd_pcm * pcm)3210 static int snd_pcm_oss_unregister_minor(struct snd_pcm *pcm)
3211 {
3212 snd_pcm_oss_disconnect_minor(pcm);
3213 snd_pcm_oss_proc_done(pcm);
3214 return 0;
3215 }
3216
3217 static struct snd_pcm_notify snd_pcm_oss_notify =
3218 {
3219 .n_register = snd_pcm_oss_register_minor,
3220 .n_disconnect = snd_pcm_oss_disconnect_minor,
3221 .n_unregister = snd_pcm_oss_unregister_minor,
3222 };
3223
alsa_pcm_oss_init(void)3224 static int __init alsa_pcm_oss_init(void)
3225 {
3226 int i;
3227 int err;
3228
3229 /* check device map table */
3230 for (i = 0; i < SNDRV_CARDS; i++) {
3231 if (dsp_map[i] < 0 || dsp_map[i] >= SNDRV_PCM_DEVICES) {
3232 pr_err("ALSA: pcm_oss: invalid dsp_map[%d] = %d\n",
3233 i, dsp_map[i]);
3234 dsp_map[i] = 0;
3235 }
3236 if (adsp_map[i] < 0 || adsp_map[i] >= SNDRV_PCM_DEVICES) {
3237 pr_err("ALSA: pcm_oss: invalid adsp_map[%d] = %d\n",
3238 i, adsp_map[i]);
3239 adsp_map[i] = 1;
3240 }
3241 }
3242 if ((err = snd_pcm_notify(&snd_pcm_oss_notify, 0)) < 0)
3243 return err;
3244 return 0;
3245 }
3246
alsa_pcm_oss_exit(void)3247 static void __exit alsa_pcm_oss_exit(void)
3248 {
3249 snd_pcm_notify(&snd_pcm_oss_notify, 1);
3250 }
3251
3252 module_init(alsa_pcm_oss_init)
3253 module_exit(alsa_pcm_oss_exit)
3254