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 <sound/core.h>
37 #include <sound/minors.h>
38 #include <sound/pcm.h>
39 #include <sound/pcm_params.h>
40 #include "pcm_plugin.h"
41 #include <sound/info.h>
42 #include <linux/soundcard.h>
43 #include <sound/initval.h>
44 #include <sound/mixer_oss.h>
45
46 #define OSS_ALSAEMULVER _SIOR ('M', 249, int)
47
48 static int dsp_map[SNDRV_CARDS];
49 static int adsp_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
50 static bool nonblock_open = 1;
51
52 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
53 MODULE_DESCRIPTION("PCM OSS emulation for ALSA.");
54 MODULE_LICENSE("GPL");
55 module_param_array(dsp_map, int, NULL, 0444);
56 MODULE_PARM_DESC(dsp_map, "PCM device number assigned to 1st OSS device.");
57 module_param_array(adsp_map, int, NULL, 0444);
58 MODULE_PARM_DESC(adsp_map, "PCM device number assigned to 2nd OSS device.");
59 module_param(nonblock_open, bool, 0644);
60 MODULE_PARM_DESC(nonblock_open, "Don't block opening busy PCM devices.");
61 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_PCM);
62 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_PCM1);
63
64 static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file);
65 static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file);
66 static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file);
67
snd_enter_user(void)68 static inline mm_segment_t snd_enter_user(void)
69 {
70 mm_segment_t fs = get_fs();
71 set_fs(get_ds());
72 return fs;
73 }
74
snd_leave_user(mm_segment_t fs)75 static inline void snd_leave_user(mm_segment_t fs)
76 {
77 set_fs(fs);
78 }
79
80 /*
81 * helper functions to process hw_params
82 */
snd_interval_refine_min(struct snd_interval * i,unsigned int min,int openmin)83 static int snd_interval_refine_min(struct snd_interval *i, unsigned int min, int openmin)
84 {
85 int changed = 0;
86 if (i->min < min) {
87 i->min = min;
88 i->openmin = openmin;
89 changed = 1;
90 } else if (i->min == min && !i->openmin && openmin) {
91 i->openmin = 1;
92 changed = 1;
93 }
94 if (i->integer) {
95 if (i->openmin) {
96 i->min++;
97 i->openmin = 0;
98 }
99 }
100 if (snd_interval_checkempty(i)) {
101 snd_interval_none(i);
102 return -EINVAL;
103 }
104 return changed;
105 }
106
snd_interval_refine_max(struct snd_interval * i,unsigned int max,int openmax)107 static int snd_interval_refine_max(struct snd_interval *i, unsigned int max, int openmax)
108 {
109 int changed = 0;
110 if (i->max > max) {
111 i->max = max;
112 i->openmax = openmax;
113 changed = 1;
114 } else if (i->max == max && !i->openmax && openmax) {
115 i->openmax = 1;
116 changed = 1;
117 }
118 if (i->integer) {
119 if (i->openmax) {
120 i->max--;
121 i->openmax = 0;
122 }
123 }
124 if (snd_interval_checkempty(i)) {
125 snd_interval_none(i);
126 return -EINVAL;
127 }
128 return changed;
129 }
130
snd_interval_refine_set(struct snd_interval * i,unsigned int val)131 static int snd_interval_refine_set(struct snd_interval *i, unsigned int val)
132 {
133 struct snd_interval t;
134 t.empty = 0;
135 t.min = t.max = val;
136 t.openmin = t.openmax = 0;
137 t.integer = 1;
138 return snd_interval_refine(i, &t);
139 }
140
141 /**
142 * snd_pcm_hw_param_value_min
143 * @params: the hw_params instance
144 * @var: parameter to retrieve
145 * @dir: pointer to the direction (-1,0,1) or NULL
146 *
147 * Return the minimum value for field PAR.
148 */
149 static unsigned int
snd_pcm_hw_param_value_min(const struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,int * dir)150 snd_pcm_hw_param_value_min(const struct snd_pcm_hw_params *params,
151 snd_pcm_hw_param_t var, int *dir)
152 {
153 if (hw_is_mask(var)) {
154 if (dir)
155 *dir = 0;
156 return snd_mask_min(hw_param_mask_c(params, var));
157 }
158 if (hw_is_interval(var)) {
159 const struct snd_interval *i = hw_param_interval_c(params, var);
160 if (dir)
161 *dir = i->openmin;
162 return snd_interval_min(i);
163 }
164 return -EINVAL;
165 }
166
167 /**
168 * snd_pcm_hw_param_value_max
169 * @params: the hw_params instance
170 * @var: parameter to retrieve
171 * @dir: pointer to the direction (-1,0,1) or NULL
172 *
173 * Return the maximum value for field PAR.
174 */
175 static unsigned int
snd_pcm_hw_param_value_max(const struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,int * dir)176 snd_pcm_hw_param_value_max(const struct snd_pcm_hw_params *params,
177 snd_pcm_hw_param_t var, int *dir)
178 {
179 if (hw_is_mask(var)) {
180 if (dir)
181 *dir = 0;
182 return snd_mask_max(hw_param_mask_c(params, var));
183 }
184 if (hw_is_interval(var)) {
185 const struct snd_interval *i = hw_param_interval_c(params, var);
186 if (dir)
187 *dir = - (int) i->openmax;
188 return snd_interval_max(i);
189 }
190 return -EINVAL;
191 }
192
_snd_pcm_hw_param_mask(struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,const struct snd_mask * val)193 static int _snd_pcm_hw_param_mask(struct snd_pcm_hw_params *params,
194 snd_pcm_hw_param_t var,
195 const struct snd_mask *val)
196 {
197 int changed;
198 changed = snd_mask_refine(hw_param_mask(params, var), val);
199 if (changed) {
200 params->cmask |= 1 << var;
201 params->rmask |= 1 << var;
202 }
203 return changed;
204 }
205
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)206 static int snd_pcm_hw_param_mask(struct snd_pcm_substream *pcm,
207 struct snd_pcm_hw_params *params,
208 snd_pcm_hw_param_t var,
209 const struct snd_mask *val)
210 {
211 int changed = _snd_pcm_hw_param_mask(params, var, val);
212 if (changed < 0)
213 return changed;
214 if (params->rmask) {
215 int err = snd_pcm_hw_refine(pcm, params);
216 if (err < 0)
217 return err;
218 }
219 return 0;
220 }
221
_snd_pcm_hw_param_min(struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,unsigned int val,int dir)222 static int _snd_pcm_hw_param_min(struct snd_pcm_hw_params *params,
223 snd_pcm_hw_param_t var, unsigned int val,
224 int dir)
225 {
226 int changed;
227 int open = 0;
228 if (dir) {
229 if (dir > 0) {
230 open = 1;
231 } else if (dir < 0) {
232 if (val > 0) {
233 open = 1;
234 val--;
235 }
236 }
237 }
238 if (hw_is_mask(var))
239 changed = snd_mask_refine_min(hw_param_mask(params, var),
240 val + !!open);
241 else if (hw_is_interval(var))
242 changed = snd_interval_refine_min(hw_param_interval(params, var),
243 val, open);
244 else
245 return -EINVAL;
246 if (changed) {
247 params->cmask |= 1 << var;
248 params->rmask |= 1 << var;
249 }
250 return changed;
251 }
252
253 /**
254 * snd_pcm_hw_param_min
255 * @pcm: PCM instance
256 * @params: the hw_params instance
257 * @var: parameter to retrieve
258 * @val: minimal value
259 * @dir: pointer to the direction (-1,0,1) or NULL
260 *
261 * Inside configuration space defined by PARAMS remove from PAR all
262 * values < VAL. Reduce configuration space accordingly.
263 * Return new minimum or -EINVAL if the configuration space is empty
264 */
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)265 static int snd_pcm_hw_param_min(struct snd_pcm_substream *pcm,
266 struct snd_pcm_hw_params *params,
267 snd_pcm_hw_param_t var, unsigned int val,
268 int *dir)
269 {
270 int changed = _snd_pcm_hw_param_min(params, var, val, dir ? *dir : 0);
271 if (changed < 0)
272 return changed;
273 if (params->rmask) {
274 int err = snd_pcm_hw_refine(pcm, params);
275 if (err < 0)
276 return err;
277 }
278 return snd_pcm_hw_param_value_min(params, var, dir);
279 }
280
_snd_pcm_hw_param_max(struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,unsigned int val,int dir)281 static int _snd_pcm_hw_param_max(struct snd_pcm_hw_params *params,
282 snd_pcm_hw_param_t var, unsigned int val,
283 int dir)
284 {
285 int changed;
286 int open = 0;
287 if (dir) {
288 if (dir < 0) {
289 open = 1;
290 } else if (dir > 0) {
291 open = 1;
292 val++;
293 }
294 }
295 if (hw_is_mask(var)) {
296 if (val == 0 && open) {
297 snd_mask_none(hw_param_mask(params, var));
298 changed = -EINVAL;
299 } else
300 changed = snd_mask_refine_max(hw_param_mask(params, var),
301 val - !!open);
302 } else if (hw_is_interval(var))
303 changed = snd_interval_refine_max(hw_param_interval(params, var),
304 val, open);
305 else
306 return -EINVAL;
307 if (changed) {
308 params->cmask |= 1 << var;
309 params->rmask |= 1 << var;
310 }
311 return changed;
312 }
313
314 /**
315 * snd_pcm_hw_param_max
316 * @pcm: PCM instance
317 * @params: the hw_params instance
318 * @var: parameter to retrieve
319 * @val: maximal value
320 * @dir: pointer to the direction (-1,0,1) or NULL
321 *
322 * Inside configuration space defined by PARAMS remove from PAR all
323 * values >= VAL + 1. Reduce configuration space accordingly.
324 * Return new maximum or -EINVAL if the configuration space is empty
325 */
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)326 static int snd_pcm_hw_param_max(struct snd_pcm_substream *pcm,
327 struct snd_pcm_hw_params *params,
328 snd_pcm_hw_param_t var, unsigned int val,
329 int *dir)
330 {
331 int changed = _snd_pcm_hw_param_max(params, var, val, dir ? *dir : 0);
332 if (changed < 0)
333 return changed;
334 if (params->rmask) {
335 int err = snd_pcm_hw_refine(pcm, params);
336 if (err < 0)
337 return err;
338 }
339 return snd_pcm_hw_param_value_max(params, var, dir);
340 }
341
boundary_sub(int a,int adir,int b,int bdir,int * c,int * cdir)342 static int boundary_sub(int a, int adir,
343 int b, int bdir,
344 int *c, int *cdir)
345 {
346 adir = adir < 0 ? -1 : (adir > 0 ? 1 : 0);
347 bdir = bdir < 0 ? -1 : (bdir > 0 ? 1 : 0);
348 *c = a - b;
349 *cdir = adir - bdir;
350 if (*cdir == -2) {
351 (*c)--;
352 } else if (*cdir == 2) {
353 (*c)++;
354 }
355 return 0;
356 }
357
boundary_lt(unsigned int a,int adir,unsigned int b,int bdir)358 static int boundary_lt(unsigned int a, int adir,
359 unsigned int b, int bdir)
360 {
361 if (adir < 0) {
362 a--;
363 adir = 1;
364 } else if (adir > 0)
365 adir = 1;
366 if (bdir < 0) {
367 b--;
368 bdir = 1;
369 } else if (bdir > 0)
370 bdir = 1;
371 return a < b || (a == b && adir < bdir);
372 }
373
374 /* Return 1 if min is nearer to best than max */
boundary_nearer(int min,int mindir,int best,int bestdir,int max,int maxdir)375 static int boundary_nearer(int min, int mindir,
376 int best, int bestdir,
377 int max, int maxdir)
378 {
379 int dmin, dmindir;
380 int dmax, dmaxdir;
381 boundary_sub(best, bestdir, min, mindir, &dmin, &dmindir);
382 boundary_sub(max, maxdir, best, bestdir, &dmax, &dmaxdir);
383 return boundary_lt(dmin, dmindir, dmax, dmaxdir);
384 }
385
386 /**
387 * snd_pcm_hw_param_near
388 * @pcm: PCM instance
389 * @params: the hw_params instance
390 * @var: parameter to retrieve
391 * @best: value to set
392 * @dir: pointer to the direction (-1,0,1) or NULL
393 *
394 * Inside configuration space defined by PARAMS set PAR to the available value
395 * nearest to VAL. Reduce configuration space accordingly.
396 * This function cannot be called for SNDRV_PCM_HW_PARAM_ACCESS,
397 * SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT.
398 * Return the value found.
399 */
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)400 static int snd_pcm_hw_param_near(struct snd_pcm_substream *pcm,
401 struct snd_pcm_hw_params *params,
402 snd_pcm_hw_param_t var, unsigned int best,
403 int *dir)
404 {
405 struct snd_pcm_hw_params *save = NULL;
406 int v;
407 unsigned int saved_min;
408 int last = 0;
409 int min, max;
410 int mindir, maxdir;
411 int valdir = dir ? *dir : 0;
412 /* FIXME */
413 if (best > INT_MAX)
414 best = INT_MAX;
415 min = max = best;
416 mindir = maxdir = valdir;
417 if (maxdir > 0)
418 maxdir = 0;
419 else if (maxdir == 0)
420 maxdir = -1;
421 else {
422 maxdir = 1;
423 max--;
424 }
425 save = kmalloc(sizeof(*save), GFP_KERNEL);
426 if (save == NULL)
427 return -ENOMEM;
428 *save = *params;
429 saved_min = min;
430 min = snd_pcm_hw_param_min(pcm, params, var, min, &mindir);
431 if (min >= 0) {
432 struct snd_pcm_hw_params *params1;
433 if (max < 0)
434 goto _end;
435 if ((unsigned int)min == saved_min && mindir == valdir)
436 goto _end;
437 params1 = kmalloc(sizeof(*params1), GFP_KERNEL);
438 if (params1 == NULL) {
439 kfree(save);
440 return -ENOMEM;
441 }
442 *params1 = *save;
443 max = snd_pcm_hw_param_max(pcm, params1, var, max, &maxdir);
444 if (max < 0) {
445 kfree(params1);
446 goto _end;
447 }
448 if (boundary_nearer(max, maxdir, best, valdir, min, mindir)) {
449 *params = *params1;
450 last = 1;
451 }
452 kfree(params1);
453 } else {
454 *params = *save;
455 max = snd_pcm_hw_param_max(pcm, params, var, max, &maxdir);
456 if (max < 0) {
457 kfree(save);
458 return max;
459 }
460 last = 1;
461 }
462 _end:
463 kfree(save);
464 if (last)
465 v = snd_pcm_hw_param_last(pcm, params, var, dir);
466 else
467 v = snd_pcm_hw_param_first(pcm, params, var, dir);
468 return v;
469 }
470
_snd_pcm_hw_param_set(struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,unsigned int val,int dir)471 static int _snd_pcm_hw_param_set(struct snd_pcm_hw_params *params,
472 snd_pcm_hw_param_t var, unsigned int val,
473 int dir)
474 {
475 int changed;
476 if (hw_is_mask(var)) {
477 struct snd_mask *m = hw_param_mask(params, var);
478 if (val == 0 && dir < 0) {
479 changed = -EINVAL;
480 snd_mask_none(m);
481 } else {
482 if (dir > 0)
483 val++;
484 else if (dir < 0)
485 val--;
486 changed = snd_mask_refine_set(hw_param_mask(params, var), val);
487 }
488 } else if (hw_is_interval(var)) {
489 struct snd_interval *i = hw_param_interval(params, var);
490 if (val == 0 && dir < 0) {
491 changed = -EINVAL;
492 snd_interval_none(i);
493 } else if (dir == 0)
494 changed = snd_interval_refine_set(i, val);
495 else {
496 struct snd_interval t;
497 t.openmin = 1;
498 t.openmax = 1;
499 t.empty = 0;
500 t.integer = 0;
501 if (dir < 0) {
502 t.min = val - 1;
503 t.max = val;
504 } else {
505 t.min = val;
506 t.max = val+1;
507 }
508 changed = snd_interval_refine(i, &t);
509 }
510 } else
511 return -EINVAL;
512 if (changed) {
513 params->cmask |= 1 << var;
514 params->rmask |= 1 << var;
515 }
516 return changed;
517 }
518
519 /**
520 * snd_pcm_hw_param_set
521 * @pcm: PCM instance
522 * @params: the hw_params instance
523 * @var: parameter to retrieve
524 * @val: value to set
525 * @dir: pointer to the direction (-1,0,1) or NULL
526 *
527 * Inside configuration space defined by PARAMS remove from PAR all
528 * values != VAL. Reduce configuration space accordingly.
529 * Return VAL or -EINVAL if the configuration space is empty
530 */
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)531 static int snd_pcm_hw_param_set(struct snd_pcm_substream *pcm,
532 struct snd_pcm_hw_params *params,
533 snd_pcm_hw_param_t var, unsigned int val,
534 int dir)
535 {
536 int changed = _snd_pcm_hw_param_set(params, var, val, dir);
537 if (changed < 0)
538 return changed;
539 if (params->rmask) {
540 int err = snd_pcm_hw_refine(pcm, params);
541 if (err < 0)
542 return err;
543 }
544 return snd_pcm_hw_param_value(params, var, NULL);
545 }
546
_snd_pcm_hw_param_setinteger(struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var)547 static int _snd_pcm_hw_param_setinteger(struct snd_pcm_hw_params *params,
548 snd_pcm_hw_param_t var)
549 {
550 int changed;
551 changed = snd_interval_setinteger(hw_param_interval(params, var));
552 if (changed) {
553 params->cmask |= 1 << var;
554 params->rmask |= 1 << var;
555 }
556 return changed;
557 }
558
559 /*
560 * plugin
561 */
562
563 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
snd_pcm_oss_plugin_clear(struct snd_pcm_substream * substream)564 static int snd_pcm_oss_plugin_clear(struct snd_pcm_substream *substream)
565 {
566 struct snd_pcm_runtime *runtime = substream->runtime;
567 struct snd_pcm_plugin *plugin, *next;
568
569 plugin = runtime->oss.plugin_first;
570 while (plugin) {
571 next = plugin->next;
572 snd_pcm_plugin_free(plugin);
573 plugin = next;
574 }
575 runtime->oss.plugin_first = runtime->oss.plugin_last = NULL;
576 return 0;
577 }
578
snd_pcm_plugin_insert(struct snd_pcm_plugin * plugin)579 static int snd_pcm_plugin_insert(struct snd_pcm_plugin *plugin)
580 {
581 struct snd_pcm_runtime *runtime = plugin->plug->runtime;
582 plugin->next = runtime->oss.plugin_first;
583 plugin->prev = NULL;
584 if (runtime->oss.plugin_first) {
585 runtime->oss.plugin_first->prev = plugin;
586 runtime->oss.plugin_first = plugin;
587 } else {
588 runtime->oss.plugin_last =
589 runtime->oss.plugin_first = plugin;
590 }
591 return 0;
592 }
593
snd_pcm_plugin_append(struct snd_pcm_plugin * plugin)594 int snd_pcm_plugin_append(struct snd_pcm_plugin *plugin)
595 {
596 struct snd_pcm_runtime *runtime = plugin->plug->runtime;
597 plugin->next = NULL;
598 plugin->prev = runtime->oss.plugin_last;
599 if (runtime->oss.plugin_last) {
600 runtime->oss.plugin_last->next = plugin;
601 runtime->oss.plugin_last = plugin;
602 } else {
603 runtime->oss.plugin_last =
604 runtime->oss.plugin_first = plugin;
605 }
606 return 0;
607 }
608 #endif /* CONFIG_SND_PCM_OSS_PLUGINS */
609
snd_pcm_oss_bytes(struct snd_pcm_substream * substream,long frames)610 static long snd_pcm_oss_bytes(struct snd_pcm_substream *substream, long frames)
611 {
612 struct snd_pcm_runtime *runtime = substream->runtime;
613 long buffer_size = snd_pcm_lib_buffer_bytes(substream);
614 long bytes = frames_to_bytes(runtime, frames);
615 if (buffer_size == runtime->oss.buffer_bytes)
616 return bytes;
617 #if BITS_PER_LONG >= 64
618 return runtime->oss.buffer_bytes * bytes / buffer_size;
619 #else
620 {
621 u64 bsize = (u64)runtime->oss.buffer_bytes * (u64)bytes;
622 return div_u64(bsize, buffer_size);
623 }
624 #endif
625 }
626
snd_pcm_alsa_frames(struct snd_pcm_substream * substream,long bytes)627 static long snd_pcm_alsa_frames(struct snd_pcm_substream *substream, long bytes)
628 {
629 struct snd_pcm_runtime *runtime = substream->runtime;
630 long buffer_size = snd_pcm_lib_buffer_bytes(substream);
631 if (buffer_size == runtime->oss.buffer_bytes)
632 return bytes_to_frames(runtime, bytes);
633 return bytes_to_frames(runtime, (buffer_size * bytes) / runtime->oss.buffer_bytes);
634 }
635
636 static inline
get_hw_ptr_period(struct snd_pcm_runtime * runtime)637 snd_pcm_uframes_t get_hw_ptr_period(struct snd_pcm_runtime *runtime)
638 {
639 return runtime->hw_ptr_interrupt;
640 }
641
642 /* define extended formats in the recent OSS versions (if any) */
643 /* linear formats */
644 #define AFMT_S32_LE 0x00001000
645 #define AFMT_S32_BE 0x00002000
646 #define AFMT_S24_LE 0x00008000
647 #define AFMT_S24_BE 0x00010000
648 #define AFMT_S24_PACKED 0x00040000
649
650 /* other supported formats */
651 #define AFMT_FLOAT 0x00004000
652 #define AFMT_SPDIF_RAW 0x00020000
653
654 /* unsupported formats */
655 #define AFMT_AC3 0x00000400
656 #define AFMT_VORBIS 0x00000800
657
snd_pcm_oss_format_from(int format)658 static snd_pcm_format_t snd_pcm_oss_format_from(int format)
659 {
660 switch (format) {
661 case AFMT_MU_LAW: return SNDRV_PCM_FORMAT_MU_LAW;
662 case AFMT_A_LAW: return SNDRV_PCM_FORMAT_A_LAW;
663 case AFMT_IMA_ADPCM: return SNDRV_PCM_FORMAT_IMA_ADPCM;
664 case AFMT_U8: return SNDRV_PCM_FORMAT_U8;
665 case AFMT_S16_LE: return SNDRV_PCM_FORMAT_S16_LE;
666 case AFMT_S16_BE: return SNDRV_PCM_FORMAT_S16_BE;
667 case AFMT_S8: return SNDRV_PCM_FORMAT_S8;
668 case AFMT_U16_LE: return SNDRV_PCM_FORMAT_U16_LE;
669 case AFMT_U16_BE: return SNDRV_PCM_FORMAT_U16_BE;
670 case AFMT_MPEG: return SNDRV_PCM_FORMAT_MPEG;
671 case AFMT_S32_LE: return SNDRV_PCM_FORMAT_S32_LE;
672 case AFMT_S32_BE: return SNDRV_PCM_FORMAT_S32_BE;
673 case AFMT_S24_LE: return SNDRV_PCM_FORMAT_S24_LE;
674 case AFMT_S24_BE: return SNDRV_PCM_FORMAT_S24_BE;
675 case AFMT_S24_PACKED: return SNDRV_PCM_FORMAT_S24_3LE;
676 case AFMT_FLOAT: return SNDRV_PCM_FORMAT_FLOAT;
677 case AFMT_SPDIF_RAW: return SNDRV_PCM_FORMAT_IEC958_SUBFRAME;
678 default: return SNDRV_PCM_FORMAT_U8;
679 }
680 }
681
snd_pcm_oss_format_to(snd_pcm_format_t format)682 static int snd_pcm_oss_format_to(snd_pcm_format_t format)
683 {
684 switch (format) {
685 case SNDRV_PCM_FORMAT_MU_LAW: return AFMT_MU_LAW;
686 case SNDRV_PCM_FORMAT_A_LAW: return AFMT_A_LAW;
687 case SNDRV_PCM_FORMAT_IMA_ADPCM: return AFMT_IMA_ADPCM;
688 case SNDRV_PCM_FORMAT_U8: return AFMT_U8;
689 case SNDRV_PCM_FORMAT_S16_LE: return AFMT_S16_LE;
690 case SNDRV_PCM_FORMAT_S16_BE: return AFMT_S16_BE;
691 case SNDRV_PCM_FORMAT_S8: return AFMT_S8;
692 case SNDRV_PCM_FORMAT_U16_LE: return AFMT_U16_LE;
693 case SNDRV_PCM_FORMAT_U16_BE: return AFMT_U16_BE;
694 case SNDRV_PCM_FORMAT_MPEG: return AFMT_MPEG;
695 case SNDRV_PCM_FORMAT_S32_LE: return AFMT_S32_LE;
696 case SNDRV_PCM_FORMAT_S32_BE: return AFMT_S32_BE;
697 case SNDRV_PCM_FORMAT_S24_LE: return AFMT_S24_LE;
698 case SNDRV_PCM_FORMAT_S24_BE: return AFMT_S24_BE;
699 case SNDRV_PCM_FORMAT_S24_3LE: return AFMT_S24_PACKED;
700 case SNDRV_PCM_FORMAT_FLOAT: return AFMT_FLOAT;
701 case SNDRV_PCM_FORMAT_IEC958_SUBFRAME: return AFMT_SPDIF_RAW;
702 default: return -EINVAL;
703 }
704 }
705
snd_pcm_oss_period_size(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * oss_params,struct snd_pcm_hw_params * slave_params)706 static int snd_pcm_oss_period_size(struct snd_pcm_substream *substream,
707 struct snd_pcm_hw_params *oss_params,
708 struct snd_pcm_hw_params *slave_params)
709 {
710 size_t s;
711 size_t oss_buffer_size, oss_period_size, oss_periods;
712 size_t min_period_size, max_period_size;
713 struct snd_pcm_runtime *runtime = substream->runtime;
714 size_t oss_frame_size;
715
716 oss_frame_size = snd_pcm_format_physical_width(params_format(oss_params)) *
717 params_channels(oss_params) / 8;
718
719 oss_buffer_size = snd_pcm_plug_client_size(substream,
720 snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, NULL)) * oss_frame_size;
721 oss_buffer_size = 1 << ld2(oss_buffer_size);
722 if (atomic_read(&substream->mmap_count)) {
723 if (oss_buffer_size > runtime->oss.mmap_bytes)
724 oss_buffer_size = runtime->oss.mmap_bytes;
725 }
726
727 if (substream->oss.setup.period_size > 16)
728 oss_period_size = substream->oss.setup.period_size;
729 else if (runtime->oss.fragshift) {
730 oss_period_size = 1 << runtime->oss.fragshift;
731 if (oss_period_size > oss_buffer_size / 2)
732 oss_period_size = oss_buffer_size / 2;
733 } else {
734 int sd;
735 size_t bytes_per_sec = params_rate(oss_params) * snd_pcm_format_physical_width(params_format(oss_params)) * params_channels(oss_params) / 8;
736
737 oss_period_size = oss_buffer_size;
738 do {
739 oss_period_size /= 2;
740 } while (oss_period_size > bytes_per_sec);
741 if (runtime->oss.subdivision == 0) {
742 sd = 4;
743 if (oss_period_size / sd > 4096)
744 sd *= 2;
745 if (oss_period_size / sd < 4096)
746 sd = 1;
747 } else
748 sd = runtime->oss.subdivision;
749 oss_period_size /= sd;
750 if (oss_period_size < 16)
751 oss_period_size = 16;
752 }
753
754 min_period_size = snd_pcm_plug_client_size(substream,
755 snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL));
756 min_period_size *= oss_frame_size;
757 min_period_size = 1 << (ld2(min_period_size - 1) + 1);
758 if (oss_period_size < min_period_size)
759 oss_period_size = min_period_size;
760
761 max_period_size = snd_pcm_plug_client_size(substream,
762 snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL));
763 max_period_size *= oss_frame_size;
764 max_period_size = 1 << ld2(max_period_size);
765 if (oss_period_size > max_period_size)
766 oss_period_size = max_period_size;
767
768 oss_periods = oss_buffer_size / oss_period_size;
769
770 if (substream->oss.setup.periods > 1)
771 oss_periods = substream->oss.setup.periods;
772
773 s = snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL);
774 if (runtime->oss.maxfrags && s > runtime->oss.maxfrags)
775 s = runtime->oss.maxfrags;
776 if (oss_periods > s)
777 oss_periods = s;
778
779 s = snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL);
780 if (s < 2)
781 s = 2;
782 if (oss_periods < s)
783 oss_periods = s;
784
785 while (oss_period_size * oss_periods > oss_buffer_size)
786 oss_period_size /= 2;
787
788 if (oss_period_size < 16)
789 return -EINVAL;
790 runtime->oss.period_bytes = oss_period_size;
791 runtime->oss.period_frames = 1;
792 runtime->oss.periods = oss_periods;
793 return 0;
794 }
795
choose_rate(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,unsigned int best_rate)796 static int choose_rate(struct snd_pcm_substream *substream,
797 struct snd_pcm_hw_params *params, unsigned int best_rate)
798 {
799 struct snd_interval *it;
800 struct snd_pcm_hw_params *save;
801 unsigned int rate, prev;
802
803 save = kmalloc(sizeof(*save), GFP_KERNEL);
804 if (save == NULL)
805 return -ENOMEM;
806 *save = *params;
807 it = hw_param_interval(save, SNDRV_PCM_HW_PARAM_RATE);
808
809 /* try multiples of the best rate */
810 rate = best_rate;
811 for (;;) {
812 if (it->max < rate || (it->max == rate && it->openmax))
813 break;
814 if (it->min < rate || (it->min == rate && !it->openmin)) {
815 int ret;
816 ret = snd_pcm_hw_param_set(substream, params,
817 SNDRV_PCM_HW_PARAM_RATE,
818 rate, 0);
819 if (ret == (int)rate) {
820 kfree(save);
821 return rate;
822 }
823 *params = *save;
824 }
825 prev = rate;
826 rate += best_rate;
827 if (rate <= prev)
828 break;
829 }
830
831 /* not found, use the nearest rate */
832 kfree(save);
833 return snd_pcm_hw_param_near(substream, params, SNDRV_PCM_HW_PARAM_RATE, best_rate, NULL);
834 }
835
snd_pcm_oss_change_params(struct snd_pcm_substream * substream,bool trylock)836 static int snd_pcm_oss_change_params(struct snd_pcm_substream *substream,
837 bool trylock)
838 {
839 struct snd_pcm_runtime *runtime = substream->runtime;
840 struct snd_pcm_hw_params *params, *sparams;
841 struct snd_pcm_sw_params *sw_params;
842 ssize_t oss_buffer_size, oss_period_size;
843 size_t oss_frame_size;
844 int err;
845 int direct;
846 snd_pcm_format_t format, sformat;
847 int n;
848 struct snd_mask sformat_mask;
849 struct snd_mask mask;
850
851 if (trylock) {
852 if (!(mutex_trylock(&runtime->oss.params_lock)))
853 return -EAGAIN;
854 } else if (mutex_lock_interruptible(&runtime->oss.params_lock))
855 return -EINTR;
856 sw_params = kmalloc(sizeof(*sw_params), GFP_KERNEL);
857 params = kmalloc(sizeof(*params), GFP_KERNEL);
858 sparams = kmalloc(sizeof(*sparams), GFP_KERNEL);
859 if (!sw_params || !params || !sparams) {
860 pcm_dbg(substream->pcm, "No memory\n");
861 err = -ENOMEM;
862 goto failure;
863 }
864
865 if (atomic_read(&substream->mmap_count))
866 direct = 1;
867 else
868 direct = substream->oss.setup.direct;
869
870 _snd_pcm_hw_params_any(sparams);
871 _snd_pcm_hw_param_setinteger(sparams, SNDRV_PCM_HW_PARAM_PERIODS);
872 _snd_pcm_hw_param_min(sparams, SNDRV_PCM_HW_PARAM_PERIODS, 2, 0);
873 snd_mask_none(&mask);
874 if (atomic_read(&substream->mmap_count))
875 snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
876 else {
877 snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED);
878 if (!direct)
879 snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
880 }
881 err = snd_pcm_hw_param_mask(substream, sparams, SNDRV_PCM_HW_PARAM_ACCESS, &mask);
882 if (err < 0) {
883 pcm_dbg(substream->pcm, "No usable accesses\n");
884 err = -EINVAL;
885 goto failure;
886 }
887 choose_rate(substream, sparams, runtime->oss.rate);
888 snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_CHANNELS, runtime->oss.channels, NULL);
889
890 format = snd_pcm_oss_format_from(runtime->oss.format);
891
892 sformat_mask = *hw_param_mask(sparams, SNDRV_PCM_HW_PARAM_FORMAT);
893 if (direct)
894 sformat = format;
895 else
896 sformat = snd_pcm_plug_slave_format(format, &sformat_mask);
897
898 if ((__force int)sformat < 0 ||
899 !snd_mask_test(&sformat_mask, (__force int)sformat)) {
900 for (sformat = (__force snd_pcm_format_t)0;
901 (__force int)sformat <= (__force int)SNDRV_PCM_FORMAT_LAST;
902 sformat = (__force snd_pcm_format_t)((__force int)sformat + 1)) {
903 if (snd_mask_test(&sformat_mask, (__force int)sformat) &&
904 snd_pcm_oss_format_to(sformat) >= 0)
905 break;
906 }
907 if ((__force int)sformat > (__force int)SNDRV_PCM_FORMAT_LAST) {
908 pcm_dbg(substream->pcm, "Cannot find a format!!!\n");
909 err = -EINVAL;
910 goto failure;
911 }
912 }
913 err = _snd_pcm_hw_param_set(sparams, SNDRV_PCM_HW_PARAM_FORMAT, (__force int)sformat, 0);
914 if (err < 0)
915 goto failure;
916
917 if (direct) {
918 memcpy(params, sparams, sizeof(*params));
919 } else {
920 _snd_pcm_hw_params_any(params);
921 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_ACCESS,
922 (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED, 0);
923 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_FORMAT,
924 (__force int)snd_pcm_oss_format_from(runtime->oss.format), 0);
925 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_CHANNELS,
926 runtime->oss.channels, 0);
927 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_RATE,
928 runtime->oss.rate, 0);
929 pdprintf("client: access = %i, format = %i, channels = %i, rate = %i\n",
930 params_access(params), params_format(params),
931 params_channels(params), params_rate(params));
932 }
933 pdprintf("slave: access = %i, format = %i, channels = %i, rate = %i\n",
934 params_access(sparams), params_format(sparams),
935 params_channels(sparams), params_rate(sparams));
936
937 oss_frame_size = snd_pcm_format_physical_width(params_format(params)) *
938 params_channels(params) / 8;
939
940 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
941 snd_pcm_oss_plugin_clear(substream);
942 if (!direct) {
943 /* add necessary plugins */
944 snd_pcm_oss_plugin_clear(substream);
945 if ((err = snd_pcm_plug_format_plugins(substream,
946 params,
947 sparams)) < 0) {
948 pcm_dbg(substream->pcm,
949 "snd_pcm_plug_format_plugins failed: %i\n", err);
950 snd_pcm_oss_plugin_clear(substream);
951 goto failure;
952 }
953 if (runtime->oss.plugin_first) {
954 struct snd_pcm_plugin *plugin;
955 if ((err = snd_pcm_plugin_build_io(substream, sparams, &plugin)) < 0) {
956 pcm_dbg(substream->pcm,
957 "snd_pcm_plugin_build_io failed: %i\n", err);
958 snd_pcm_oss_plugin_clear(substream);
959 goto failure;
960 }
961 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
962 err = snd_pcm_plugin_append(plugin);
963 } else {
964 err = snd_pcm_plugin_insert(plugin);
965 }
966 if (err < 0) {
967 snd_pcm_oss_plugin_clear(substream);
968 goto failure;
969 }
970 }
971 }
972 #endif
973
974 err = snd_pcm_oss_period_size(substream, params, sparams);
975 if (err < 0)
976 goto failure;
977
978 n = snd_pcm_plug_slave_size(substream, runtime->oss.period_bytes / oss_frame_size);
979 err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, n, NULL);
980 if (err < 0)
981 goto failure;
982
983 err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIODS,
984 runtime->oss.periods, NULL);
985 if (err < 0)
986 goto failure;
987
988 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
989
990 if ((err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_HW_PARAMS, sparams)) < 0) {
991 pcm_dbg(substream->pcm, "HW_PARAMS failed: %i\n", err);
992 goto failure;
993 }
994
995 memset(sw_params, 0, sizeof(*sw_params));
996 if (runtime->oss.trigger) {
997 sw_params->start_threshold = 1;
998 } else {
999 sw_params->start_threshold = runtime->boundary;
1000 }
1001 if (atomic_read(&substream->mmap_count) ||
1002 substream->stream == SNDRV_PCM_STREAM_CAPTURE)
1003 sw_params->stop_threshold = runtime->boundary;
1004 else
1005 sw_params->stop_threshold = runtime->buffer_size;
1006 sw_params->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
1007 sw_params->period_step = 1;
1008 sw_params->avail_min = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
1009 1 : runtime->period_size;
1010 if (atomic_read(&substream->mmap_count) ||
1011 substream->oss.setup.nosilence) {
1012 sw_params->silence_threshold = 0;
1013 sw_params->silence_size = 0;
1014 } else {
1015 snd_pcm_uframes_t frames;
1016 frames = runtime->period_size + 16;
1017 if (frames > runtime->buffer_size)
1018 frames = runtime->buffer_size;
1019 sw_params->silence_threshold = frames;
1020 sw_params->silence_size = frames;
1021 }
1022
1023 if ((err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_SW_PARAMS, sw_params)) < 0) {
1024 pcm_dbg(substream->pcm, "SW_PARAMS failed: %i\n", err);
1025 goto failure;
1026 }
1027
1028 runtime->oss.periods = params_periods(sparams);
1029 oss_period_size = snd_pcm_plug_client_size(substream, params_period_size(sparams));
1030 if (oss_period_size < 0) {
1031 err = -EINVAL;
1032 goto failure;
1033 }
1034 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1035 if (runtime->oss.plugin_first) {
1036 err = snd_pcm_plug_alloc(substream, oss_period_size);
1037 if (err < 0)
1038 goto failure;
1039 }
1040 #endif
1041 oss_period_size *= oss_frame_size;
1042
1043 oss_buffer_size = oss_period_size * runtime->oss.periods;
1044 if (oss_buffer_size < 0) {
1045 err = -EINVAL;
1046 goto failure;
1047 }
1048
1049 runtime->oss.period_bytes = oss_period_size;
1050 runtime->oss.buffer_bytes = oss_buffer_size;
1051
1052 pdprintf("oss: period bytes = %i, buffer bytes = %i\n",
1053 runtime->oss.period_bytes,
1054 runtime->oss.buffer_bytes);
1055 pdprintf("slave: period_size = %i, buffer_size = %i\n",
1056 params_period_size(sparams),
1057 params_buffer_size(sparams));
1058
1059 runtime->oss.format = snd_pcm_oss_format_to(params_format(params));
1060 runtime->oss.channels = params_channels(params);
1061 runtime->oss.rate = params_rate(params);
1062
1063 vfree(runtime->oss.buffer);
1064 runtime->oss.buffer = vmalloc(runtime->oss.period_bytes);
1065 if (!runtime->oss.buffer) {
1066 err = -ENOMEM;
1067 goto failure;
1068 }
1069
1070 runtime->oss.params = 0;
1071 runtime->oss.prepare = 1;
1072 runtime->oss.buffer_used = 0;
1073 if (runtime->dma_area)
1074 snd_pcm_format_set_silence(runtime->format, runtime->dma_area, bytes_to_samples(runtime, runtime->dma_bytes));
1075
1076 runtime->oss.period_frames = snd_pcm_alsa_frames(substream, oss_period_size);
1077
1078 err = 0;
1079 failure:
1080 kfree(sw_params);
1081 kfree(params);
1082 kfree(sparams);
1083 mutex_unlock(&runtime->oss.params_lock);
1084 return err;
1085 }
1086
snd_pcm_oss_get_active_substream(struct snd_pcm_oss_file * pcm_oss_file,struct snd_pcm_substream ** r_substream)1087 static int snd_pcm_oss_get_active_substream(struct snd_pcm_oss_file *pcm_oss_file, struct snd_pcm_substream **r_substream)
1088 {
1089 int idx, err;
1090 struct snd_pcm_substream *asubstream = NULL, *substream;
1091
1092 for (idx = 0; idx < 2; idx++) {
1093 substream = pcm_oss_file->streams[idx];
1094 if (substream == NULL)
1095 continue;
1096 if (asubstream == NULL)
1097 asubstream = substream;
1098 if (substream->runtime->oss.params) {
1099 err = snd_pcm_oss_change_params(substream, false);
1100 if (err < 0)
1101 return err;
1102 }
1103 }
1104 if (!asubstream)
1105 return -EIO;
1106 if (r_substream)
1107 *r_substream = asubstream;
1108 return 0;
1109 }
1110
snd_pcm_oss_prepare(struct snd_pcm_substream * substream)1111 static int snd_pcm_oss_prepare(struct snd_pcm_substream *substream)
1112 {
1113 int err;
1114 struct snd_pcm_runtime *runtime = substream->runtime;
1115
1116 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PREPARE, NULL);
1117 if (err < 0) {
1118 pcm_dbg(substream->pcm,
1119 "snd_pcm_oss_prepare: SNDRV_PCM_IOCTL_PREPARE failed\n");
1120 return err;
1121 }
1122 runtime->oss.prepare = 0;
1123 runtime->oss.prev_hw_ptr_period = 0;
1124 runtime->oss.period_ptr = 0;
1125 runtime->oss.buffer_used = 0;
1126
1127 return 0;
1128 }
1129
snd_pcm_oss_make_ready(struct snd_pcm_substream * substream)1130 static int snd_pcm_oss_make_ready(struct snd_pcm_substream *substream)
1131 {
1132 struct snd_pcm_runtime *runtime;
1133 int err;
1134
1135 if (substream == NULL)
1136 return 0;
1137 runtime = substream->runtime;
1138 if (runtime->oss.params) {
1139 err = snd_pcm_oss_change_params(substream, false);
1140 if (err < 0)
1141 return err;
1142 }
1143 if (runtime->oss.prepare) {
1144 err = snd_pcm_oss_prepare(substream);
1145 if (err < 0)
1146 return err;
1147 }
1148 return 0;
1149 }
1150
snd_pcm_oss_capture_position_fixup(struct snd_pcm_substream * substream,snd_pcm_sframes_t * delay)1151 static int snd_pcm_oss_capture_position_fixup(struct snd_pcm_substream *substream, snd_pcm_sframes_t *delay)
1152 {
1153 struct snd_pcm_runtime *runtime;
1154 snd_pcm_uframes_t frames;
1155 int err = 0;
1156
1157 while (1) {
1158 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, delay);
1159 if (err < 0)
1160 break;
1161 runtime = substream->runtime;
1162 if (*delay <= (snd_pcm_sframes_t)runtime->buffer_size)
1163 break;
1164 /* in case of overrun, skip whole periods like OSS/Linux driver does */
1165 /* until avail(delay) <= buffer_size */
1166 frames = (*delay - runtime->buffer_size) + runtime->period_size - 1;
1167 frames /= runtime->period_size;
1168 frames *= runtime->period_size;
1169 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_FORWARD, &frames);
1170 if (err < 0)
1171 break;
1172 }
1173 return err;
1174 }
1175
snd_pcm_oss_write3(struct snd_pcm_substream * substream,const char * ptr,snd_pcm_uframes_t frames,int in_kernel)1176 snd_pcm_sframes_t snd_pcm_oss_write3(struct snd_pcm_substream *substream, const char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1177 {
1178 struct snd_pcm_runtime *runtime = substream->runtime;
1179 int ret;
1180 while (1) {
1181 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1182 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1183 #ifdef OSS_DEBUG
1184 pcm_dbg(substream->pcm,
1185 "pcm_oss: write: recovering from %s\n",
1186 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1187 "XRUN" : "SUSPEND");
1188 #endif
1189 ret = snd_pcm_oss_prepare(substream);
1190 if (ret < 0)
1191 break;
1192 }
1193 if (in_kernel) {
1194 mm_segment_t fs;
1195 fs = snd_enter_user();
1196 ret = snd_pcm_lib_write(substream, (void __force __user *)ptr, frames);
1197 snd_leave_user(fs);
1198 } else {
1199 ret = snd_pcm_lib_write(substream, (void __force __user *)ptr, frames);
1200 }
1201 if (ret != -EPIPE && ret != -ESTRPIPE)
1202 break;
1203 /* test, if we can't store new data, because the stream */
1204 /* has not been started */
1205 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED)
1206 return -EAGAIN;
1207 }
1208 return ret;
1209 }
1210
snd_pcm_oss_read3(struct snd_pcm_substream * substream,char * ptr,snd_pcm_uframes_t frames,int in_kernel)1211 snd_pcm_sframes_t snd_pcm_oss_read3(struct snd_pcm_substream *substream, char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1212 {
1213 struct snd_pcm_runtime *runtime = substream->runtime;
1214 snd_pcm_sframes_t delay;
1215 int ret;
1216 while (1) {
1217 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1218 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1219 #ifdef OSS_DEBUG
1220 pcm_dbg(substream->pcm,
1221 "pcm_oss: read: recovering from %s\n",
1222 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1223 "XRUN" : "SUSPEND");
1224 #endif
1225 ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1226 if (ret < 0)
1227 break;
1228 } else if (runtime->status->state == SNDRV_PCM_STATE_SETUP) {
1229 ret = snd_pcm_oss_prepare(substream);
1230 if (ret < 0)
1231 break;
1232 }
1233 ret = snd_pcm_oss_capture_position_fixup(substream, &delay);
1234 if (ret < 0)
1235 break;
1236 if (in_kernel) {
1237 mm_segment_t fs;
1238 fs = snd_enter_user();
1239 ret = snd_pcm_lib_read(substream, (void __force __user *)ptr, frames);
1240 snd_leave_user(fs);
1241 } else {
1242 ret = snd_pcm_lib_read(substream, (void __force __user *)ptr, frames);
1243 }
1244 if (ret == -EPIPE) {
1245 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1246 ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1247 if (ret < 0)
1248 break;
1249 }
1250 continue;
1251 }
1252 if (ret != -ESTRPIPE)
1253 break;
1254 }
1255 return ret;
1256 }
1257
snd_pcm_oss_writev3(struct snd_pcm_substream * substream,void ** bufs,snd_pcm_uframes_t frames,int in_kernel)1258 snd_pcm_sframes_t snd_pcm_oss_writev3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames, int in_kernel)
1259 {
1260 struct snd_pcm_runtime *runtime = substream->runtime;
1261 int ret;
1262 while (1) {
1263 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1264 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1265 #ifdef OSS_DEBUG
1266 pcm_dbg(substream->pcm,
1267 "pcm_oss: writev: recovering from %s\n",
1268 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1269 "XRUN" : "SUSPEND");
1270 #endif
1271 ret = snd_pcm_oss_prepare(substream);
1272 if (ret < 0)
1273 break;
1274 }
1275 if (in_kernel) {
1276 mm_segment_t fs;
1277 fs = snd_enter_user();
1278 ret = snd_pcm_lib_writev(substream, (void __user **)bufs, frames);
1279 snd_leave_user(fs);
1280 } else {
1281 ret = snd_pcm_lib_writev(substream, (void __user **)bufs, frames);
1282 }
1283 if (ret != -EPIPE && ret != -ESTRPIPE)
1284 break;
1285
1286 /* test, if we can't store new data, because the stream */
1287 /* has not been started */
1288 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED)
1289 return -EAGAIN;
1290 }
1291 return ret;
1292 }
1293
snd_pcm_oss_readv3(struct snd_pcm_substream * substream,void ** bufs,snd_pcm_uframes_t frames,int in_kernel)1294 snd_pcm_sframes_t snd_pcm_oss_readv3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames, int in_kernel)
1295 {
1296 struct snd_pcm_runtime *runtime = substream->runtime;
1297 int ret;
1298 while (1) {
1299 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1300 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1301 #ifdef OSS_DEBUG
1302 pcm_dbg(substream->pcm,
1303 "pcm_oss: readv: recovering from %s\n",
1304 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1305 "XRUN" : "SUSPEND");
1306 #endif
1307 ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1308 if (ret < 0)
1309 break;
1310 } else if (runtime->status->state == SNDRV_PCM_STATE_SETUP) {
1311 ret = snd_pcm_oss_prepare(substream);
1312 if (ret < 0)
1313 break;
1314 }
1315 if (in_kernel) {
1316 mm_segment_t fs;
1317 fs = snd_enter_user();
1318 ret = snd_pcm_lib_readv(substream, (void __user **)bufs, frames);
1319 snd_leave_user(fs);
1320 } else {
1321 ret = snd_pcm_lib_readv(substream, (void __user **)bufs, frames);
1322 }
1323 if (ret != -EPIPE && ret != -ESTRPIPE)
1324 break;
1325 }
1326 return ret;
1327 }
1328
snd_pcm_oss_write2(struct snd_pcm_substream * substream,const char * buf,size_t bytes,int in_kernel)1329 static ssize_t snd_pcm_oss_write2(struct snd_pcm_substream *substream, const char *buf, size_t bytes, int in_kernel)
1330 {
1331 struct snd_pcm_runtime *runtime = substream->runtime;
1332 snd_pcm_sframes_t frames, frames1;
1333 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1334 if (runtime->oss.plugin_first) {
1335 struct snd_pcm_plugin_channel *channels;
1336 size_t oss_frame_bytes = (runtime->oss.plugin_first->src_width * runtime->oss.plugin_first->src_format.channels) / 8;
1337 if (!in_kernel) {
1338 if (copy_from_user(runtime->oss.buffer, (const char __force __user *)buf, bytes))
1339 return -EFAULT;
1340 buf = runtime->oss.buffer;
1341 }
1342 frames = bytes / oss_frame_bytes;
1343 frames1 = snd_pcm_plug_client_channels_buf(substream, (char *)buf, frames, &channels);
1344 if (frames1 < 0)
1345 return frames1;
1346 frames1 = snd_pcm_plug_write_transfer(substream, channels, frames1);
1347 if (frames1 <= 0)
1348 return frames1;
1349 bytes = frames1 * oss_frame_bytes;
1350 } else
1351 #endif
1352 {
1353 frames = bytes_to_frames(runtime, bytes);
1354 frames1 = snd_pcm_oss_write3(substream, buf, frames, in_kernel);
1355 if (frames1 <= 0)
1356 return frames1;
1357 bytes = frames_to_bytes(runtime, frames1);
1358 }
1359 return bytes;
1360 }
1361
snd_pcm_oss_write1(struct snd_pcm_substream * substream,const char __user * buf,size_t bytes)1362 static ssize_t snd_pcm_oss_write1(struct snd_pcm_substream *substream, const char __user *buf, size_t bytes)
1363 {
1364 size_t xfer = 0;
1365 ssize_t tmp;
1366 struct snd_pcm_runtime *runtime = substream->runtime;
1367
1368 if (atomic_read(&substream->mmap_count))
1369 return -ENXIO;
1370
1371 if ((tmp = snd_pcm_oss_make_ready(substream)) < 0)
1372 return tmp;
1373 while (bytes > 0) {
1374 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1375 tmp = -ERESTARTSYS;
1376 break;
1377 }
1378 if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1379 tmp = bytes;
1380 if (tmp + runtime->oss.buffer_used > runtime->oss.period_bytes)
1381 tmp = runtime->oss.period_bytes - runtime->oss.buffer_used;
1382 if (tmp > 0) {
1383 if (copy_from_user(runtime->oss.buffer + runtime->oss.buffer_used, buf, tmp)) {
1384 tmp = -EFAULT;
1385 goto err;
1386 }
1387 }
1388 runtime->oss.buffer_used += tmp;
1389 buf += tmp;
1390 bytes -= tmp;
1391 xfer += tmp;
1392 if (substream->oss.setup.partialfrag ||
1393 runtime->oss.buffer_used == runtime->oss.period_bytes) {
1394 tmp = snd_pcm_oss_write2(substream, runtime->oss.buffer + runtime->oss.period_ptr,
1395 runtime->oss.buffer_used - runtime->oss.period_ptr, 1);
1396 if (tmp <= 0)
1397 goto err;
1398 runtime->oss.bytes += tmp;
1399 runtime->oss.period_ptr += tmp;
1400 runtime->oss.period_ptr %= runtime->oss.period_bytes;
1401 if (runtime->oss.period_ptr == 0 ||
1402 runtime->oss.period_ptr == runtime->oss.buffer_used)
1403 runtime->oss.buffer_used = 0;
1404 else if ((substream->f_flags & O_NONBLOCK) != 0) {
1405 tmp = -EAGAIN;
1406 goto err;
1407 }
1408 }
1409 } else {
1410 tmp = snd_pcm_oss_write2(substream,
1411 (const char __force *)buf,
1412 runtime->oss.period_bytes, 0);
1413 if (tmp <= 0)
1414 goto err;
1415 runtime->oss.bytes += tmp;
1416 buf += tmp;
1417 bytes -= tmp;
1418 xfer += tmp;
1419 if ((substream->f_flags & O_NONBLOCK) != 0 &&
1420 tmp != runtime->oss.period_bytes)
1421 tmp = -EAGAIN;
1422 }
1423 err:
1424 mutex_unlock(&runtime->oss.params_lock);
1425 if (tmp < 0)
1426 break;
1427 if (signal_pending(current)) {
1428 tmp = -ERESTARTSYS;
1429 break;
1430 }
1431 tmp = 0;
1432 }
1433 return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1434 }
1435
snd_pcm_oss_read2(struct snd_pcm_substream * substream,char * buf,size_t bytes,int in_kernel)1436 static ssize_t snd_pcm_oss_read2(struct snd_pcm_substream *substream, char *buf, size_t bytes, int in_kernel)
1437 {
1438 struct snd_pcm_runtime *runtime = substream->runtime;
1439 snd_pcm_sframes_t frames, frames1;
1440 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1441 char __user *final_dst = (char __force __user *)buf;
1442 if (runtime->oss.plugin_first) {
1443 struct snd_pcm_plugin_channel *channels;
1444 size_t oss_frame_bytes = (runtime->oss.plugin_last->dst_width * runtime->oss.plugin_last->dst_format.channels) / 8;
1445 if (!in_kernel)
1446 buf = runtime->oss.buffer;
1447 frames = bytes / oss_frame_bytes;
1448 frames1 = snd_pcm_plug_client_channels_buf(substream, buf, frames, &channels);
1449 if (frames1 < 0)
1450 return frames1;
1451 frames1 = snd_pcm_plug_read_transfer(substream, channels, frames1);
1452 if (frames1 <= 0)
1453 return frames1;
1454 bytes = frames1 * oss_frame_bytes;
1455 if (!in_kernel && copy_to_user(final_dst, buf, bytes))
1456 return -EFAULT;
1457 } else
1458 #endif
1459 {
1460 frames = bytes_to_frames(runtime, bytes);
1461 frames1 = snd_pcm_oss_read3(substream, buf, frames, in_kernel);
1462 if (frames1 <= 0)
1463 return frames1;
1464 bytes = frames_to_bytes(runtime, frames1);
1465 }
1466 return bytes;
1467 }
1468
snd_pcm_oss_read1(struct snd_pcm_substream * substream,char __user * buf,size_t bytes)1469 static ssize_t snd_pcm_oss_read1(struct snd_pcm_substream *substream, char __user *buf, size_t bytes)
1470 {
1471 size_t xfer = 0;
1472 ssize_t tmp;
1473 struct snd_pcm_runtime *runtime = substream->runtime;
1474
1475 if (atomic_read(&substream->mmap_count))
1476 return -ENXIO;
1477
1478 if ((tmp = snd_pcm_oss_make_ready(substream)) < 0)
1479 return tmp;
1480 while (bytes > 0) {
1481 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1482 tmp = -ERESTARTSYS;
1483 break;
1484 }
1485 if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1486 if (runtime->oss.buffer_used == 0) {
1487 tmp = snd_pcm_oss_read2(substream, runtime->oss.buffer, runtime->oss.period_bytes, 1);
1488 if (tmp <= 0)
1489 goto err;
1490 runtime->oss.bytes += tmp;
1491 runtime->oss.period_ptr = tmp;
1492 runtime->oss.buffer_used = tmp;
1493 }
1494 tmp = bytes;
1495 if ((size_t) tmp > runtime->oss.buffer_used)
1496 tmp = runtime->oss.buffer_used;
1497 if (copy_to_user(buf, runtime->oss.buffer + (runtime->oss.period_ptr - runtime->oss.buffer_used), tmp)) {
1498 tmp = -EFAULT;
1499 goto err;
1500 }
1501 buf += tmp;
1502 bytes -= tmp;
1503 xfer += tmp;
1504 runtime->oss.buffer_used -= tmp;
1505 } else {
1506 tmp = snd_pcm_oss_read2(substream, (char __force *)buf,
1507 runtime->oss.period_bytes, 0);
1508 if (tmp <= 0)
1509 goto err;
1510 runtime->oss.bytes += tmp;
1511 buf += tmp;
1512 bytes -= tmp;
1513 xfer += tmp;
1514 }
1515 err:
1516 mutex_unlock(&runtime->oss.params_lock);
1517 if (tmp < 0)
1518 break;
1519 if (signal_pending(current)) {
1520 tmp = -ERESTARTSYS;
1521 break;
1522 }
1523 tmp = 0;
1524 }
1525 return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1526 }
1527
snd_pcm_oss_reset(struct snd_pcm_oss_file * pcm_oss_file)1528 static int snd_pcm_oss_reset(struct snd_pcm_oss_file *pcm_oss_file)
1529 {
1530 struct snd_pcm_substream *substream;
1531 struct snd_pcm_runtime *runtime;
1532 int i;
1533
1534 for (i = 0; i < 2; i++) {
1535 substream = pcm_oss_file->streams[i];
1536 if (!substream)
1537 continue;
1538 runtime = substream->runtime;
1539 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1540 runtime->oss.prepare = 1;
1541 runtime->oss.buffer_used = 0;
1542 runtime->oss.prev_hw_ptr_period = 0;
1543 runtime->oss.period_ptr = 0;
1544 }
1545 return 0;
1546 }
1547
snd_pcm_oss_post(struct snd_pcm_oss_file * pcm_oss_file)1548 static int snd_pcm_oss_post(struct snd_pcm_oss_file *pcm_oss_file)
1549 {
1550 struct snd_pcm_substream *substream;
1551 int err;
1552
1553 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1554 if (substream != NULL) {
1555 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
1556 return err;
1557 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_START, NULL);
1558 }
1559 /* note: all errors from the start action are ignored */
1560 /* OSS apps do not know, how to handle them */
1561 return 0;
1562 }
1563
snd_pcm_oss_sync1(struct snd_pcm_substream * substream,size_t size)1564 static int snd_pcm_oss_sync1(struct snd_pcm_substream *substream, size_t size)
1565 {
1566 struct snd_pcm_runtime *runtime;
1567 ssize_t result = 0;
1568 snd_pcm_state_t state;
1569 long res;
1570 wait_queue_t wait;
1571
1572 runtime = substream->runtime;
1573 init_waitqueue_entry(&wait, current);
1574 add_wait_queue(&runtime->sleep, &wait);
1575 #ifdef OSS_DEBUG
1576 pcm_dbg(substream->pcm, "sync1: size = %li\n", size);
1577 #endif
1578 while (1) {
1579 result = snd_pcm_oss_write2(substream, runtime->oss.buffer, size, 1);
1580 if (result > 0) {
1581 runtime->oss.buffer_used = 0;
1582 result = 0;
1583 break;
1584 }
1585 if (result != 0 && result != -EAGAIN)
1586 break;
1587 result = 0;
1588 set_current_state(TASK_INTERRUPTIBLE);
1589 snd_pcm_stream_lock_irq(substream);
1590 state = runtime->status->state;
1591 snd_pcm_stream_unlock_irq(substream);
1592 if (state != SNDRV_PCM_STATE_RUNNING) {
1593 set_current_state(TASK_RUNNING);
1594 break;
1595 }
1596 res = schedule_timeout(10 * HZ);
1597 if (signal_pending(current)) {
1598 result = -ERESTARTSYS;
1599 break;
1600 }
1601 if (res == 0) {
1602 pcm_err(substream->pcm,
1603 "OSS sync error - DMA timeout\n");
1604 result = -EIO;
1605 break;
1606 }
1607 }
1608 remove_wait_queue(&runtime->sleep, &wait);
1609 return result;
1610 }
1611
snd_pcm_oss_sync(struct snd_pcm_oss_file * pcm_oss_file)1612 static int snd_pcm_oss_sync(struct snd_pcm_oss_file *pcm_oss_file)
1613 {
1614 int err = 0;
1615 unsigned int saved_f_flags;
1616 struct snd_pcm_substream *substream;
1617 struct snd_pcm_runtime *runtime;
1618 snd_pcm_format_t format;
1619 unsigned long width;
1620 size_t size;
1621
1622 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1623 if (substream != NULL) {
1624 runtime = substream->runtime;
1625 if (atomic_read(&substream->mmap_count))
1626 goto __direct;
1627 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
1628 return err;
1629 format = snd_pcm_oss_format_from(runtime->oss.format);
1630 width = snd_pcm_format_physical_width(format);
1631 mutex_lock(&runtime->oss.params_lock);
1632 if (runtime->oss.buffer_used > 0) {
1633 #ifdef OSS_DEBUG
1634 pcm_dbg(substream->pcm, "sync: buffer_used\n");
1635 #endif
1636 size = (8 * (runtime->oss.period_bytes - runtime->oss.buffer_used) + 7) / width;
1637 snd_pcm_format_set_silence(format,
1638 runtime->oss.buffer + runtime->oss.buffer_used,
1639 size);
1640 err = snd_pcm_oss_sync1(substream, runtime->oss.period_bytes);
1641 if (err < 0) {
1642 mutex_unlock(&runtime->oss.params_lock);
1643 return err;
1644 }
1645 } else if (runtime->oss.period_ptr > 0) {
1646 #ifdef OSS_DEBUG
1647 pcm_dbg(substream->pcm, "sync: period_ptr\n");
1648 #endif
1649 size = runtime->oss.period_bytes - runtime->oss.period_ptr;
1650 snd_pcm_format_set_silence(format,
1651 runtime->oss.buffer,
1652 size * 8 / width);
1653 err = snd_pcm_oss_sync1(substream, size);
1654 if (err < 0) {
1655 mutex_unlock(&runtime->oss.params_lock);
1656 return err;
1657 }
1658 }
1659 /*
1660 * The ALSA's period might be a bit large than OSS one.
1661 * Fill the remain portion of ALSA period with zeros.
1662 */
1663 size = runtime->control->appl_ptr % runtime->period_size;
1664 if (size > 0) {
1665 size = runtime->period_size - size;
1666 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) {
1667 size = (runtime->frame_bits * size) / 8;
1668 while (size > 0) {
1669 mm_segment_t fs;
1670 size_t size1 = size < runtime->oss.period_bytes ? size : runtime->oss.period_bytes;
1671 size -= size1;
1672 size1 *= 8;
1673 size1 /= runtime->sample_bits;
1674 snd_pcm_format_set_silence(runtime->format,
1675 runtime->oss.buffer,
1676 size1);
1677 size1 /= runtime->channels; /* frames */
1678 fs = snd_enter_user();
1679 snd_pcm_lib_write(substream, (void __force __user *)runtime->oss.buffer, size1);
1680 snd_leave_user(fs);
1681 }
1682 } else if (runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) {
1683 void __user *buffers[runtime->channels];
1684 memset(buffers, 0, runtime->channels * sizeof(void *));
1685 snd_pcm_lib_writev(substream, buffers, size);
1686 }
1687 }
1688 mutex_unlock(&runtime->oss.params_lock);
1689 /*
1690 * finish sync: drain the buffer
1691 */
1692 __direct:
1693 saved_f_flags = substream->f_flags;
1694 substream->f_flags &= ~O_NONBLOCK;
1695 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1696 substream->f_flags = saved_f_flags;
1697 if (err < 0)
1698 return err;
1699 runtime->oss.prepare = 1;
1700 }
1701
1702 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
1703 if (substream != NULL) {
1704 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
1705 return err;
1706 runtime = substream->runtime;
1707 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1708 if (err < 0)
1709 return err;
1710 runtime->oss.buffer_used = 0;
1711 runtime->oss.prepare = 1;
1712 }
1713 return 0;
1714 }
1715
snd_pcm_oss_set_rate(struct snd_pcm_oss_file * pcm_oss_file,int rate)1716 static int snd_pcm_oss_set_rate(struct snd_pcm_oss_file *pcm_oss_file, int rate)
1717 {
1718 int idx;
1719
1720 for (idx = 1; idx >= 0; --idx) {
1721 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1722 struct snd_pcm_runtime *runtime;
1723 if (substream == NULL)
1724 continue;
1725 runtime = substream->runtime;
1726 if (rate < 1000)
1727 rate = 1000;
1728 else if (rate > 192000)
1729 rate = 192000;
1730 if (runtime->oss.rate != rate) {
1731 runtime->oss.params = 1;
1732 runtime->oss.rate = rate;
1733 }
1734 }
1735 return snd_pcm_oss_get_rate(pcm_oss_file);
1736 }
1737
snd_pcm_oss_get_rate(struct snd_pcm_oss_file * pcm_oss_file)1738 static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file)
1739 {
1740 struct snd_pcm_substream *substream;
1741 int err;
1742
1743 if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1744 return err;
1745 return substream->runtime->oss.rate;
1746 }
1747
snd_pcm_oss_set_channels(struct snd_pcm_oss_file * pcm_oss_file,unsigned int channels)1748 static int snd_pcm_oss_set_channels(struct snd_pcm_oss_file *pcm_oss_file, unsigned int channels)
1749 {
1750 int idx;
1751 if (channels < 1)
1752 channels = 1;
1753 if (channels > 128)
1754 return -EINVAL;
1755 for (idx = 1; idx >= 0; --idx) {
1756 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1757 struct snd_pcm_runtime *runtime;
1758 if (substream == NULL)
1759 continue;
1760 runtime = substream->runtime;
1761 if (runtime->oss.channels != channels) {
1762 runtime->oss.params = 1;
1763 runtime->oss.channels = channels;
1764 }
1765 }
1766 return snd_pcm_oss_get_channels(pcm_oss_file);
1767 }
1768
snd_pcm_oss_get_channels(struct snd_pcm_oss_file * pcm_oss_file)1769 static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file)
1770 {
1771 struct snd_pcm_substream *substream;
1772 int err;
1773
1774 if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1775 return err;
1776 return substream->runtime->oss.channels;
1777 }
1778
snd_pcm_oss_get_block_size(struct snd_pcm_oss_file * pcm_oss_file)1779 static int snd_pcm_oss_get_block_size(struct snd_pcm_oss_file *pcm_oss_file)
1780 {
1781 struct snd_pcm_substream *substream;
1782 int err;
1783
1784 if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1785 return err;
1786 return substream->runtime->oss.period_bytes;
1787 }
1788
snd_pcm_oss_get_formats(struct snd_pcm_oss_file * pcm_oss_file)1789 static int snd_pcm_oss_get_formats(struct snd_pcm_oss_file *pcm_oss_file)
1790 {
1791 struct snd_pcm_substream *substream;
1792 int err;
1793 int direct;
1794 struct snd_pcm_hw_params *params;
1795 unsigned int formats = 0;
1796 struct snd_mask format_mask;
1797 int fmt;
1798
1799 if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1800 return err;
1801 if (atomic_read(&substream->mmap_count))
1802 direct = 1;
1803 else
1804 direct = substream->oss.setup.direct;
1805 if (!direct)
1806 return AFMT_MU_LAW | AFMT_U8 |
1807 AFMT_S16_LE | AFMT_S16_BE |
1808 AFMT_S8 | AFMT_U16_LE |
1809 AFMT_U16_BE |
1810 AFMT_S32_LE | AFMT_S32_BE |
1811 AFMT_S24_LE | AFMT_S24_BE |
1812 AFMT_S24_PACKED;
1813 params = kmalloc(sizeof(*params), GFP_KERNEL);
1814 if (!params)
1815 return -ENOMEM;
1816 _snd_pcm_hw_params_any(params);
1817 err = snd_pcm_hw_refine(substream, params);
1818 format_mask = *hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1819 kfree(params);
1820 if (err < 0)
1821 return err;
1822 for (fmt = 0; fmt < 32; ++fmt) {
1823 if (snd_mask_test(&format_mask, fmt)) {
1824 int f = snd_pcm_oss_format_to(fmt);
1825 if (f >= 0)
1826 formats |= f;
1827 }
1828 }
1829 return formats;
1830 }
1831
snd_pcm_oss_set_format(struct snd_pcm_oss_file * pcm_oss_file,int format)1832 static int snd_pcm_oss_set_format(struct snd_pcm_oss_file *pcm_oss_file, int format)
1833 {
1834 int formats, idx;
1835
1836 if (format != AFMT_QUERY) {
1837 formats = snd_pcm_oss_get_formats(pcm_oss_file);
1838 if (formats < 0)
1839 return formats;
1840 if (!(formats & format))
1841 format = AFMT_U8;
1842 for (idx = 1; idx >= 0; --idx) {
1843 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1844 struct snd_pcm_runtime *runtime;
1845 if (substream == NULL)
1846 continue;
1847 runtime = substream->runtime;
1848 if (runtime->oss.format != format) {
1849 runtime->oss.params = 1;
1850 runtime->oss.format = format;
1851 }
1852 }
1853 }
1854 return snd_pcm_oss_get_format(pcm_oss_file);
1855 }
1856
snd_pcm_oss_get_format(struct snd_pcm_oss_file * pcm_oss_file)1857 static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file)
1858 {
1859 struct snd_pcm_substream *substream;
1860 int err;
1861
1862 if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1863 return err;
1864 return substream->runtime->oss.format;
1865 }
1866
snd_pcm_oss_set_subdivide1(struct snd_pcm_substream * substream,int subdivide)1867 static int snd_pcm_oss_set_subdivide1(struct snd_pcm_substream *substream, int subdivide)
1868 {
1869 struct snd_pcm_runtime *runtime;
1870
1871 if (substream == NULL)
1872 return 0;
1873 runtime = substream->runtime;
1874 if (subdivide == 0) {
1875 subdivide = runtime->oss.subdivision;
1876 if (subdivide == 0)
1877 subdivide = 1;
1878 return subdivide;
1879 }
1880 if (runtime->oss.subdivision || runtime->oss.fragshift)
1881 return -EINVAL;
1882 if (subdivide != 1 && subdivide != 2 && subdivide != 4 &&
1883 subdivide != 8 && subdivide != 16)
1884 return -EINVAL;
1885 runtime->oss.subdivision = subdivide;
1886 runtime->oss.params = 1;
1887 return subdivide;
1888 }
1889
snd_pcm_oss_set_subdivide(struct snd_pcm_oss_file * pcm_oss_file,int subdivide)1890 static int snd_pcm_oss_set_subdivide(struct snd_pcm_oss_file *pcm_oss_file, int subdivide)
1891 {
1892 int err = -EINVAL, idx;
1893
1894 for (idx = 1; idx >= 0; --idx) {
1895 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1896 if (substream == NULL)
1897 continue;
1898 if ((err = snd_pcm_oss_set_subdivide1(substream, subdivide)) < 0)
1899 return err;
1900 }
1901 return err;
1902 }
1903
snd_pcm_oss_set_fragment1(struct snd_pcm_substream * substream,unsigned int val)1904 static int snd_pcm_oss_set_fragment1(struct snd_pcm_substream *substream, unsigned int val)
1905 {
1906 struct snd_pcm_runtime *runtime;
1907
1908 if (substream == NULL)
1909 return 0;
1910 runtime = substream->runtime;
1911 if (runtime->oss.subdivision || runtime->oss.fragshift)
1912 return -EINVAL;
1913 runtime->oss.fragshift = val & 0xffff;
1914 runtime->oss.maxfrags = (val >> 16) & 0xffff;
1915 if (runtime->oss.fragshift < 4) /* < 16 */
1916 runtime->oss.fragshift = 4;
1917 if (runtime->oss.maxfrags < 2)
1918 runtime->oss.maxfrags = 2;
1919 runtime->oss.params = 1;
1920 return 0;
1921 }
1922
snd_pcm_oss_set_fragment(struct snd_pcm_oss_file * pcm_oss_file,unsigned int val)1923 static int snd_pcm_oss_set_fragment(struct snd_pcm_oss_file *pcm_oss_file, unsigned int val)
1924 {
1925 int err = -EINVAL, idx;
1926
1927 for (idx = 1; idx >= 0; --idx) {
1928 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1929 if (substream == NULL)
1930 continue;
1931 if ((err = snd_pcm_oss_set_fragment1(substream, val)) < 0)
1932 return err;
1933 }
1934 return err;
1935 }
1936
snd_pcm_oss_nonblock(struct file * file)1937 static int snd_pcm_oss_nonblock(struct file * file)
1938 {
1939 spin_lock(&file->f_lock);
1940 file->f_flags |= O_NONBLOCK;
1941 spin_unlock(&file->f_lock);
1942 return 0;
1943 }
1944
snd_pcm_oss_get_caps1(struct snd_pcm_substream * substream,int res)1945 static int snd_pcm_oss_get_caps1(struct snd_pcm_substream *substream, int res)
1946 {
1947
1948 if (substream == NULL) {
1949 res &= ~DSP_CAP_DUPLEX;
1950 return res;
1951 }
1952 #ifdef DSP_CAP_MULTI
1953 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1954 if (substream->pstr->substream_count > 1)
1955 res |= DSP_CAP_MULTI;
1956 #endif
1957 /* DSP_CAP_REALTIME is set all times: */
1958 /* all ALSA drivers can return actual pointer in ring buffer */
1959 #if defined(DSP_CAP_REALTIME) && 0
1960 {
1961 struct snd_pcm_runtime *runtime = substream->runtime;
1962 if (runtime->info & (SNDRV_PCM_INFO_BLOCK_TRANSFER|SNDRV_PCM_INFO_BATCH))
1963 res &= ~DSP_CAP_REALTIME;
1964 }
1965 #endif
1966 return res;
1967 }
1968
snd_pcm_oss_get_caps(struct snd_pcm_oss_file * pcm_oss_file)1969 static int snd_pcm_oss_get_caps(struct snd_pcm_oss_file *pcm_oss_file)
1970 {
1971 int result, idx;
1972
1973 result = DSP_CAP_TRIGGER | DSP_CAP_MMAP | DSP_CAP_DUPLEX | DSP_CAP_REALTIME;
1974 for (idx = 0; idx < 2; idx++) {
1975 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1976 result = snd_pcm_oss_get_caps1(substream, result);
1977 }
1978 result |= 0x0001; /* revision - same as SB AWE 64 */
1979 return result;
1980 }
1981
snd_pcm_oss_simulate_fill(struct snd_pcm_substream * substream,snd_pcm_uframes_t hw_ptr)1982 static void snd_pcm_oss_simulate_fill(struct snd_pcm_substream *substream,
1983 snd_pcm_uframes_t hw_ptr)
1984 {
1985 struct snd_pcm_runtime *runtime = substream->runtime;
1986 snd_pcm_uframes_t appl_ptr;
1987 appl_ptr = hw_ptr + runtime->buffer_size;
1988 appl_ptr %= runtime->boundary;
1989 runtime->control->appl_ptr = appl_ptr;
1990 }
1991
snd_pcm_oss_set_trigger(struct snd_pcm_oss_file * pcm_oss_file,int trigger)1992 static int snd_pcm_oss_set_trigger(struct snd_pcm_oss_file *pcm_oss_file, int trigger)
1993 {
1994 struct snd_pcm_runtime *runtime;
1995 struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
1996 int err, cmd;
1997
1998 #ifdef OSS_DEBUG
1999 pcm_dbg(substream->pcm, "pcm_oss: trigger = 0x%x\n", trigger);
2000 #endif
2001
2002 psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2003 csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2004
2005 if (psubstream) {
2006 if ((err = snd_pcm_oss_make_ready(psubstream)) < 0)
2007 return err;
2008 }
2009 if (csubstream) {
2010 if ((err = snd_pcm_oss_make_ready(csubstream)) < 0)
2011 return err;
2012 }
2013 if (psubstream) {
2014 runtime = psubstream->runtime;
2015 if (trigger & PCM_ENABLE_OUTPUT) {
2016 if (runtime->oss.trigger)
2017 goto _skip1;
2018 if (atomic_read(&psubstream->mmap_count))
2019 snd_pcm_oss_simulate_fill(psubstream,
2020 get_hw_ptr_period(runtime));
2021 runtime->oss.trigger = 1;
2022 runtime->start_threshold = 1;
2023 cmd = SNDRV_PCM_IOCTL_START;
2024 } else {
2025 if (!runtime->oss.trigger)
2026 goto _skip1;
2027 runtime->oss.trigger = 0;
2028 runtime->start_threshold = runtime->boundary;
2029 cmd = SNDRV_PCM_IOCTL_DROP;
2030 runtime->oss.prepare = 1;
2031 }
2032 err = snd_pcm_kernel_ioctl(psubstream, cmd, NULL);
2033 if (err < 0)
2034 return err;
2035 }
2036 _skip1:
2037 if (csubstream) {
2038 runtime = csubstream->runtime;
2039 if (trigger & PCM_ENABLE_INPUT) {
2040 if (runtime->oss.trigger)
2041 goto _skip2;
2042 runtime->oss.trigger = 1;
2043 runtime->start_threshold = 1;
2044 cmd = SNDRV_PCM_IOCTL_START;
2045 } else {
2046 if (!runtime->oss.trigger)
2047 goto _skip2;
2048 runtime->oss.trigger = 0;
2049 runtime->start_threshold = runtime->boundary;
2050 cmd = SNDRV_PCM_IOCTL_DROP;
2051 runtime->oss.prepare = 1;
2052 }
2053 err = snd_pcm_kernel_ioctl(csubstream, cmd, NULL);
2054 if (err < 0)
2055 return err;
2056 }
2057 _skip2:
2058 return 0;
2059 }
2060
snd_pcm_oss_get_trigger(struct snd_pcm_oss_file * pcm_oss_file)2061 static int snd_pcm_oss_get_trigger(struct snd_pcm_oss_file *pcm_oss_file)
2062 {
2063 struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2064 int result = 0;
2065
2066 psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2067 csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2068 if (psubstream && psubstream->runtime && psubstream->runtime->oss.trigger)
2069 result |= PCM_ENABLE_OUTPUT;
2070 if (csubstream && csubstream->runtime && csubstream->runtime->oss.trigger)
2071 result |= PCM_ENABLE_INPUT;
2072 return result;
2073 }
2074
snd_pcm_oss_get_odelay(struct snd_pcm_oss_file * pcm_oss_file)2075 static int snd_pcm_oss_get_odelay(struct snd_pcm_oss_file *pcm_oss_file)
2076 {
2077 struct snd_pcm_substream *substream;
2078 struct snd_pcm_runtime *runtime;
2079 snd_pcm_sframes_t delay;
2080 int err;
2081
2082 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2083 if (substream == NULL)
2084 return -EINVAL;
2085 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
2086 return err;
2087 runtime = substream->runtime;
2088 if (runtime->oss.params || runtime->oss.prepare)
2089 return 0;
2090 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
2091 if (err == -EPIPE)
2092 delay = 0; /* hack for broken OSS applications */
2093 else if (err < 0)
2094 return err;
2095 return snd_pcm_oss_bytes(substream, delay);
2096 }
2097
snd_pcm_oss_get_ptr(struct snd_pcm_oss_file * pcm_oss_file,int stream,struct count_info __user * _info)2098 static int snd_pcm_oss_get_ptr(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct count_info __user * _info)
2099 {
2100 struct snd_pcm_substream *substream;
2101 struct snd_pcm_runtime *runtime;
2102 snd_pcm_sframes_t delay;
2103 int fixup;
2104 struct count_info info;
2105 int err;
2106
2107 if (_info == NULL)
2108 return -EFAULT;
2109 substream = pcm_oss_file->streams[stream];
2110 if (substream == NULL)
2111 return -EINVAL;
2112 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
2113 return err;
2114 runtime = substream->runtime;
2115 if (runtime->oss.params || runtime->oss.prepare) {
2116 memset(&info, 0, sizeof(info));
2117 if (copy_to_user(_info, &info, sizeof(info)))
2118 return -EFAULT;
2119 return 0;
2120 }
2121 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2122 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
2123 if (err == -EPIPE || err == -ESTRPIPE || (! err && delay < 0)) {
2124 err = 0;
2125 delay = 0;
2126 fixup = 0;
2127 } else {
2128 fixup = runtime->oss.buffer_used;
2129 }
2130 } else {
2131 err = snd_pcm_oss_capture_position_fixup(substream, &delay);
2132 fixup = -runtime->oss.buffer_used;
2133 }
2134 if (err < 0)
2135 return err;
2136 info.ptr = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr % runtime->buffer_size);
2137 if (atomic_read(&substream->mmap_count)) {
2138 snd_pcm_sframes_t n;
2139 delay = get_hw_ptr_period(runtime);
2140 n = delay - runtime->oss.prev_hw_ptr_period;
2141 if (n < 0)
2142 n += runtime->boundary;
2143 info.blocks = n / runtime->period_size;
2144 runtime->oss.prev_hw_ptr_period = delay;
2145 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2146 snd_pcm_oss_simulate_fill(substream, delay);
2147 info.bytes = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr) & INT_MAX;
2148 } else {
2149 delay = snd_pcm_oss_bytes(substream, delay);
2150 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2151 if (substream->oss.setup.buggyptr)
2152 info.blocks = (runtime->oss.buffer_bytes - delay - fixup) / runtime->oss.period_bytes;
2153 else
2154 info.blocks = (delay + fixup) / runtime->oss.period_bytes;
2155 info.bytes = (runtime->oss.bytes - delay) & INT_MAX;
2156 } else {
2157 delay += fixup;
2158 info.blocks = delay / runtime->oss.period_bytes;
2159 info.bytes = (runtime->oss.bytes + delay) & INT_MAX;
2160 }
2161 }
2162 if (copy_to_user(_info, &info, sizeof(info)))
2163 return -EFAULT;
2164 return 0;
2165 }
2166
snd_pcm_oss_get_space(struct snd_pcm_oss_file * pcm_oss_file,int stream,struct audio_buf_info __user * _info)2167 static int snd_pcm_oss_get_space(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct audio_buf_info __user *_info)
2168 {
2169 struct snd_pcm_substream *substream;
2170 struct snd_pcm_runtime *runtime;
2171 snd_pcm_sframes_t avail;
2172 int fixup;
2173 struct audio_buf_info info;
2174 int err;
2175
2176 if (_info == NULL)
2177 return -EFAULT;
2178 substream = pcm_oss_file->streams[stream];
2179 if (substream == NULL)
2180 return -EINVAL;
2181 runtime = substream->runtime;
2182
2183 if (runtime->oss.params &&
2184 (err = snd_pcm_oss_change_params(substream, false)) < 0)
2185 return err;
2186
2187 info.fragsize = runtime->oss.period_bytes;
2188 info.fragstotal = runtime->periods;
2189 if (runtime->oss.prepare) {
2190 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2191 info.bytes = runtime->oss.period_bytes * runtime->oss.periods;
2192 info.fragments = runtime->oss.periods;
2193 } else {
2194 info.bytes = 0;
2195 info.fragments = 0;
2196 }
2197 } else {
2198 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2199 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &avail);
2200 if (err == -EPIPE || err == -ESTRPIPE || (! err && avail < 0)) {
2201 avail = runtime->buffer_size;
2202 err = 0;
2203 fixup = 0;
2204 } else {
2205 avail = runtime->buffer_size - avail;
2206 fixup = -runtime->oss.buffer_used;
2207 }
2208 } else {
2209 err = snd_pcm_oss_capture_position_fixup(substream, &avail);
2210 fixup = runtime->oss.buffer_used;
2211 }
2212 if (err < 0)
2213 return err;
2214 info.bytes = snd_pcm_oss_bytes(substream, avail) + fixup;
2215 info.fragments = info.bytes / runtime->oss.period_bytes;
2216 }
2217
2218 #ifdef OSS_DEBUG
2219 pcm_dbg(substream->pcm,
2220 "pcm_oss: space: bytes = %i, fragments = %i, fragstotal = %i, fragsize = %i\n",
2221 info.bytes, info.fragments, info.fragstotal, info.fragsize);
2222 #endif
2223 if (copy_to_user(_info, &info, sizeof(info)))
2224 return -EFAULT;
2225 return 0;
2226 }
2227
snd_pcm_oss_get_mapbuf(struct snd_pcm_oss_file * pcm_oss_file,int stream,struct buffmem_desc __user * _info)2228 static int snd_pcm_oss_get_mapbuf(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct buffmem_desc __user * _info)
2229 {
2230 // it won't be probably implemented
2231 // pr_debug("TODO: snd_pcm_oss_get_mapbuf\n");
2232 return -EINVAL;
2233 }
2234
strip_task_path(const char * path)2235 static const char *strip_task_path(const char *path)
2236 {
2237 const char *ptr, *ptrl = NULL;
2238 for (ptr = path; *ptr; ptr++) {
2239 if (*ptr == '/')
2240 ptrl = ptr + 1;
2241 }
2242 return ptrl;
2243 }
2244
snd_pcm_oss_look_for_setup(struct snd_pcm * pcm,int stream,const char * task_name,struct snd_pcm_oss_setup * rsetup)2245 static void snd_pcm_oss_look_for_setup(struct snd_pcm *pcm, int stream,
2246 const char *task_name,
2247 struct snd_pcm_oss_setup *rsetup)
2248 {
2249 struct snd_pcm_oss_setup *setup;
2250
2251 mutex_lock(&pcm->streams[stream].oss.setup_mutex);
2252 do {
2253 for (setup = pcm->streams[stream].oss.setup_list; setup;
2254 setup = setup->next) {
2255 if (!strcmp(setup->task_name, task_name))
2256 goto out;
2257 }
2258 } while ((task_name = strip_task_path(task_name)) != NULL);
2259 out:
2260 if (setup)
2261 *rsetup = *setup;
2262 mutex_unlock(&pcm->streams[stream].oss.setup_mutex);
2263 }
2264
snd_pcm_oss_release_substream(struct snd_pcm_substream * substream)2265 static void snd_pcm_oss_release_substream(struct snd_pcm_substream *substream)
2266 {
2267 struct snd_pcm_runtime *runtime;
2268 runtime = substream->runtime;
2269 vfree(runtime->oss.buffer);
2270 runtime->oss.buffer = NULL;
2271 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
2272 snd_pcm_oss_plugin_clear(substream);
2273 #endif
2274 substream->oss.oss = 0;
2275 }
2276
snd_pcm_oss_init_substream(struct snd_pcm_substream * substream,struct snd_pcm_oss_setup * setup,int minor)2277 static void snd_pcm_oss_init_substream(struct snd_pcm_substream *substream,
2278 struct snd_pcm_oss_setup *setup,
2279 int minor)
2280 {
2281 struct snd_pcm_runtime *runtime;
2282
2283 substream->oss.oss = 1;
2284 substream->oss.setup = *setup;
2285 if (setup->nonblock)
2286 substream->f_flags |= O_NONBLOCK;
2287 else if (setup->block)
2288 substream->f_flags &= ~O_NONBLOCK;
2289 runtime = substream->runtime;
2290 runtime->oss.params = 1;
2291 runtime->oss.trigger = 1;
2292 runtime->oss.rate = 8000;
2293 mutex_init(&runtime->oss.params_lock);
2294 switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
2295 case SNDRV_MINOR_OSS_PCM_8:
2296 runtime->oss.format = AFMT_U8;
2297 break;
2298 case SNDRV_MINOR_OSS_PCM_16:
2299 runtime->oss.format = AFMT_S16_LE;
2300 break;
2301 default:
2302 runtime->oss.format = AFMT_MU_LAW;
2303 }
2304 runtime->oss.channels = 1;
2305 runtime->oss.fragshift = 0;
2306 runtime->oss.maxfrags = 0;
2307 runtime->oss.subdivision = 0;
2308 substream->pcm_release = snd_pcm_oss_release_substream;
2309 }
2310
snd_pcm_oss_release_file(struct snd_pcm_oss_file * pcm_oss_file)2311 static int snd_pcm_oss_release_file(struct snd_pcm_oss_file *pcm_oss_file)
2312 {
2313 int cidx;
2314 if (!pcm_oss_file)
2315 return 0;
2316 for (cidx = 0; cidx < 2; ++cidx) {
2317 struct snd_pcm_substream *substream = pcm_oss_file->streams[cidx];
2318 if (substream)
2319 snd_pcm_release_substream(substream);
2320 }
2321 kfree(pcm_oss_file);
2322 return 0;
2323 }
2324
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)2325 static int snd_pcm_oss_open_file(struct file *file,
2326 struct snd_pcm *pcm,
2327 struct snd_pcm_oss_file **rpcm_oss_file,
2328 int minor,
2329 struct snd_pcm_oss_setup *setup)
2330 {
2331 int idx, err;
2332 struct snd_pcm_oss_file *pcm_oss_file;
2333 struct snd_pcm_substream *substream;
2334 fmode_t f_mode = file->f_mode;
2335
2336 if (rpcm_oss_file)
2337 *rpcm_oss_file = NULL;
2338
2339 pcm_oss_file = kzalloc(sizeof(*pcm_oss_file), GFP_KERNEL);
2340 if (pcm_oss_file == NULL)
2341 return -ENOMEM;
2342
2343 if ((f_mode & (FMODE_WRITE|FMODE_READ)) == (FMODE_WRITE|FMODE_READ) &&
2344 (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX))
2345 f_mode = FMODE_WRITE;
2346
2347 file->f_flags &= ~O_APPEND;
2348 for (idx = 0; idx < 2; idx++) {
2349 if (setup[idx].disable)
2350 continue;
2351 if (! pcm->streams[idx].substream_count)
2352 continue; /* no matching substream */
2353 if (idx == SNDRV_PCM_STREAM_PLAYBACK) {
2354 if (! (f_mode & FMODE_WRITE))
2355 continue;
2356 } else {
2357 if (! (f_mode & FMODE_READ))
2358 continue;
2359 }
2360 err = snd_pcm_open_substream(pcm, idx, file, &substream);
2361 if (err < 0) {
2362 snd_pcm_oss_release_file(pcm_oss_file);
2363 return err;
2364 }
2365
2366 pcm_oss_file->streams[idx] = substream;
2367 substream->file = pcm_oss_file;
2368 snd_pcm_oss_init_substream(substream, &setup[idx], minor);
2369 }
2370
2371 if (!pcm_oss_file->streams[0] && !pcm_oss_file->streams[1]) {
2372 snd_pcm_oss_release_file(pcm_oss_file);
2373 return -EINVAL;
2374 }
2375
2376 file->private_data = pcm_oss_file;
2377 if (rpcm_oss_file)
2378 *rpcm_oss_file = pcm_oss_file;
2379 return 0;
2380 }
2381
2382
snd_task_name(struct task_struct * task,char * name,size_t size)2383 static int snd_task_name(struct task_struct *task, char *name, size_t size)
2384 {
2385 unsigned int idx;
2386
2387 if (snd_BUG_ON(!task || !name || size < 2))
2388 return -EINVAL;
2389 for (idx = 0; idx < sizeof(task->comm) && idx + 1 < size; idx++)
2390 name[idx] = task->comm[idx];
2391 name[idx] = '\0';
2392 return 0;
2393 }
2394
snd_pcm_oss_open(struct inode * inode,struct file * file)2395 static int snd_pcm_oss_open(struct inode *inode, struct file *file)
2396 {
2397 int err;
2398 char task_name[32];
2399 struct snd_pcm *pcm;
2400 struct snd_pcm_oss_file *pcm_oss_file;
2401 struct snd_pcm_oss_setup setup[2];
2402 int nonblock;
2403 wait_queue_t wait;
2404
2405 err = nonseekable_open(inode, file);
2406 if (err < 0)
2407 return err;
2408
2409 pcm = snd_lookup_oss_minor_data(iminor(inode),
2410 SNDRV_OSS_DEVICE_TYPE_PCM);
2411 if (pcm == NULL) {
2412 err = -ENODEV;
2413 goto __error1;
2414 }
2415 err = snd_card_file_add(pcm->card, file);
2416 if (err < 0)
2417 goto __error1;
2418 if (!try_module_get(pcm->card->module)) {
2419 err = -EFAULT;
2420 goto __error2;
2421 }
2422 if (snd_task_name(current, task_name, sizeof(task_name)) < 0) {
2423 err = -EFAULT;
2424 goto __error;
2425 }
2426 memset(setup, 0, sizeof(setup));
2427 if (file->f_mode & FMODE_WRITE)
2428 snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_PLAYBACK,
2429 task_name, &setup[0]);
2430 if (file->f_mode & FMODE_READ)
2431 snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_CAPTURE,
2432 task_name, &setup[1]);
2433
2434 nonblock = !!(file->f_flags & O_NONBLOCK);
2435 if (!nonblock)
2436 nonblock = nonblock_open;
2437
2438 init_waitqueue_entry(&wait, current);
2439 add_wait_queue(&pcm->open_wait, &wait);
2440 mutex_lock(&pcm->open_mutex);
2441 while (1) {
2442 err = snd_pcm_oss_open_file(file, pcm, &pcm_oss_file,
2443 iminor(inode), setup);
2444 if (err >= 0)
2445 break;
2446 if (err == -EAGAIN) {
2447 if (nonblock) {
2448 err = -EBUSY;
2449 break;
2450 }
2451 } else
2452 break;
2453 set_current_state(TASK_INTERRUPTIBLE);
2454 mutex_unlock(&pcm->open_mutex);
2455 schedule();
2456 mutex_lock(&pcm->open_mutex);
2457 if (pcm->card->shutdown) {
2458 err = -ENODEV;
2459 break;
2460 }
2461 if (signal_pending(current)) {
2462 err = -ERESTARTSYS;
2463 break;
2464 }
2465 }
2466 remove_wait_queue(&pcm->open_wait, &wait);
2467 mutex_unlock(&pcm->open_mutex);
2468 if (err < 0)
2469 goto __error;
2470 snd_card_unref(pcm->card);
2471 return err;
2472
2473 __error:
2474 module_put(pcm->card->module);
2475 __error2:
2476 snd_card_file_remove(pcm->card, file);
2477 __error1:
2478 if (pcm)
2479 snd_card_unref(pcm->card);
2480 return err;
2481 }
2482
snd_pcm_oss_release(struct inode * inode,struct file * file)2483 static int snd_pcm_oss_release(struct inode *inode, struct file *file)
2484 {
2485 struct snd_pcm *pcm;
2486 struct snd_pcm_substream *substream;
2487 struct snd_pcm_oss_file *pcm_oss_file;
2488
2489 pcm_oss_file = file->private_data;
2490 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2491 if (substream == NULL)
2492 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2493 if (snd_BUG_ON(!substream))
2494 return -ENXIO;
2495 pcm = substream->pcm;
2496 if (!pcm->card->shutdown)
2497 snd_pcm_oss_sync(pcm_oss_file);
2498 mutex_lock(&pcm->open_mutex);
2499 snd_pcm_oss_release_file(pcm_oss_file);
2500 mutex_unlock(&pcm->open_mutex);
2501 wake_up(&pcm->open_wait);
2502 module_put(pcm->card->module);
2503 snd_card_file_remove(pcm->card, file);
2504 return 0;
2505 }
2506
snd_pcm_oss_ioctl(struct file * file,unsigned int cmd,unsigned long arg)2507 static long snd_pcm_oss_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2508 {
2509 struct snd_pcm_oss_file *pcm_oss_file;
2510 int __user *p = (int __user *)arg;
2511 int res;
2512
2513 pcm_oss_file = file->private_data;
2514 if (cmd == OSS_GETVERSION)
2515 return put_user(SNDRV_OSS_VERSION, p);
2516 if (cmd == OSS_ALSAEMULVER)
2517 return put_user(1, p);
2518 #if defined(CONFIG_SND_MIXER_OSS) || (defined(MODULE) && defined(CONFIG_SND_MIXER_OSS_MODULE))
2519 if (((cmd >> 8) & 0xff) == 'M') { /* mixer ioctl - for OSS compatibility */
2520 struct snd_pcm_substream *substream;
2521 int idx;
2522 for (idx = 0; idx < 2; ++idx) {
2523 substream = pcm_oss_file->streams[idx];
2524 if (substream != NULL)
2525 break;
2526 }
2527 if (snd_BUG_ON(idx >= 2))
2528 return -ENXIO;
2529 return snd_mixer_oss_ioctl_card(substream->pcm->card, cmd, arg);
2530 }
2531 #endif
2532 if (((cmd >> 8) & 0xff) != 'P')
2533 return -EINVAL;
2534 #ifdef OSS_DEBUG
2535 pr_debug("pcm_oss: ioctl = 0x%x\n", cmd);
2536 #endif
2537 switch (cmd) {
2538 case SNDCTL_DSP_RESET:
2539 return snd_pcm_oss_reset(pcm_oss_file);
2540 case SNDCTL_DSP_SYNC:
2541 return snd_pcm_oss_sync(pcm_oss_file);
2542 case SNDCTL_DSP_SPEED:
2543 if (get_user(res, p))
2544 return -EFAULT;
2545 if ((res = snd_pcm_oss_set_rate(pcm_oss_file, res))<0)
2546 return res;
2547 return put_user(res, p);
2548 case SOUND_PCM_READ_RATE:
2549 res = snd_pcm_oss_get_rate(pcm_oss_file);
2550 if (res < 0)
2551 return res;
2552 return put_user(res, p);
2553 case SNDCTL_DSP_STEREO:
2554 if (get_user(res, p))
2555 return -EFAULT;
2556 res = res > 0 ? 2 : 1;
2557 if ((res = snd_pcm_oss_set_channels(pcm_oss_file, res)) < 0)
2558 return res;
2559 return put_user(--res, p);
2560 case SNDCTL_DSP_GETBLKSIZE:
2561 res = snd_pcm_oss_get_block_size(pcm_oss_file);
2562 if (res < 0)
2563 return res;
2564 return put_user(res, p);
2565 case SNDCTL_DSP_SETFMT:
2566 if (get_user(res, p))
2567 return -EFAULT;
2568 res = snd_pcm_oss_set_format(pcm_oss_file, res);
2569 if (res < 0)
2570 return res;
2571 return put_user(res, p);
2572 case SOUND_PCM_READ_BITS:
2573 res = snd_pcm_oss_get_format(pcm_oss_file);
2574 if (res < 0)
2575 return res;
2576 return put_user(res, p);
2577 case SNDCTL_DSP_CHANNELS:
2578 if (get_user(res, p))
2579 return -EFAULT;
2580 res = snd_pcm_oss_set_channels(pcm_oss_file, res);
2581 if (res < 0)
2582 return res;
2583 return put_user(res, p);
2584 case SOUND_PCM_READ_CHANNELS:
2585 res = snd_pcm_oss_get_channels(pcm_oss_file);
2586 if (res < 0)
2587 return res;
2588 return put_user(res, p);
2589 case SOUND_PCM_WRITE_FILTER:
2590 case SOUND_PCM_READ_FILTER:
2591 return -EIO;
2592 case SNDCTL_DSP_POST:
2593 return snd_pcm_oss_post(pcm_oss_file);
2594 case SNDCTL_DSP_SUBDIVIDE:
2595 if (get_user(res, p))
2596 return -EFAULT;
2597 res = snd_pcm_oss_set_subdivide(pcm_oss_file, res);
2598 if (res < 0)
2599 return res;
2600 return put_user(res, p);
2601 case SNDCTL_DSP_SETFRAGMENT:
2602 if (get_user(res, p))
2603 return -EFAULT;
2604 return snd_pcm_oss_set_fragment(pcm_oss_file, res);
2605 case SNDCTL_DSP_GETFMTS:
2606 res = snd_pcm_oss_get_formats(pcm_oss_file);
2607 if (res < 0)
2608 return res;
2609 return put_user(res, p);
2610 case SNDCTL_DSP_GETOSPACE:
2611 case SNDCTL_DSP_GETISPACE:
2612 return snd_pcm_oss_get_space(pcm_oss_file,
2613 cmd == SNDCTL_DSP_GETISPACE ?
2614 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2615 (struct audio_buf_info __user *) arg);
2616 case SNDCTL_DSP_NONBLOCK:
2617 return snd_pcm_oss_nonblock(file);
2618 case SNDCTL_DSP_GETCAPS:
2619 res = snd_pcm_oss_get_caps(pcm_oss_file);
2620 if (res < 0)
2621 return res;
2622 return put_user(res, p);
2623 case SNDCTL_DSP_GETTRIGGER:
2624 res = snd_pcm_oss_get_trigger(pcm_oss_file);
2625 if (res < 0)
2626 return res;
2627 return put_user(res, p);
2628 case SNDCTL_DSP_SETTRIGGER:
2629 if (get_user(res, p))
2630 return -EFAULT;
2631 return snd_pcm_oss_set_trigger(pcm_oss_file, res);
2632 case SNDCTL_DSP_GETIPTR:
2633 case SNDCTL_DSP_GETOPTR:
2634 return snd_pcm_oss_get_ptr(pcm_oss_file,
2635 cmd == SNDCTL_DSP_GETIPTR ?
2636 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2637 (struct count_info __user *) arg);
2638 case SNDCTL_DSP_MAPINBUF:
2639 case SNDCTL_DSP_MAPOUTBUF:
2640 return snd_pcm_oss_get_mapbuf(pcm_oss_file,
2641 cmd == SNDCTL_DSP_MAPINBUF ?
2642 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2643 (struct buffmem_desc __user *) arg);
2644 case SNDCTL_DSP_SETSYNCRO:
2645 /* stop DMA now.. */
2646 return 0;
2647 case SNDCTL_DSP_SETDUPLEX:
2648 if (snd_pcm_oss_get_caps(pcm_oss_file) & DSP_CAP_DUPLEX)
2649 return 0;
2650 return -EIO;
2651 case SNDCTL_DSP_GETODELAY:
2652 res = snd_pcm_oss_get_odelay(pcm_oss_file);
2653 if (res < 0) {
2654 /* it's for sure, some broken apps don't check for error codes */
2655 put_user(0, p);
2656 return res;
2657 }
2658 return put_user(res, p);
2659 case SNDCTL_DSP_PROFILE:
2660 return 0; /* silently ignore */
2661 default:
2662 pr_debug("pcm_oss: unknown command = 0x%x\n", cmd);
2663 }
2664 return -EINVAL;
2665 }
2666
2667 #ifdef CONFIG_COMPAT
2668 /* all compatible */
2669 #define snd_pcm_oss_ioctl_compat snd_pcm_oss_ioctl
2670 #else
2671 #define snd_pcm_oss_ioctl_compat NULL
2672 #endif
2673
snd_pcm_oss_read(struct file * file,char __user * buf,size_t count,loff_t * offset)2674 static ssize_t snd_pcm_oss_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
2675 {
2676 struct snd_pcm_oss_file *pcm_oss_file;
2677 struct snd_pcm_substream *substream;
2678
2679 pcm_oss_file = file->private_data;
2680 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2681 if (substream == NULL)
2682 return -ENXIO;
2683 substream->f_flags = file->f_flags & O_NONBLOCK;
2684 #ifndef OSS_DEBUG
2685 return snd_pcm_oss_read1(substream, buf, count);
2686 #else
2687 {
2688 ssize_t res = snd_pcm_oss_read1(substream, buf, count);
2689 pcm_dbg(substream->pcm,
2690 "pcm_oss: read %li bytes (returned %li bytes)\n",
2691 (long)count, (long)res);
2692 return res;
2693 }
2694 #endif
2695 }
2696
snd_pcm_oss_write(struct file * file,const char __user * buf,size_t count,loff_t * offset)2697 static ssize_t snd_pcm_oss_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
2698 {
2699 struct snd_pcm_oss_file *pcm_oss_file;
2700 struct snd_pcm_substream *substream;
2701 long result;
2702
2703 pcm_oss_file = file->private_data;
2704 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2705 if (substream == NULL)
2706 return -ENXIO;
2707 substream->f_flags = file->f_flags & O_NONBLOCK;
2708 result = snd_pcm_oss_write1(substream, buf, count);
2709 #ifdef OSS_DEBUG
2710 pcm_dbg(substream->pcm, "pcm_oss: write %li bytes (wrote %li bytes)\n",
2711 (long)count, (long)result);
2712 #endif
2713 return result;
2714 }
2715
snd_pcm_oss_playback_ready(struct snd_pcm_substream * substream)2716 static int snd_pcm_oss_playback_ready(struct snd_pcm_substream *substream)
2717 {
2718 struct snd_pcm_runtime *runtime = substream->runtime;
2719 if (atomic_read(&substream->mmap_count))
2720 return runtime->oss.prev_hw_ptr_period !=
2721 get_hw_ptr_period(runtime);
2722 else
2723 return snd_pcm_playback_avail(runtime) >=
2724 runtime->oss.period_frames;
2725 }
2726
snd_pcm_oss_capture_ready(struct snd_pcm_substream * substream)2727 static int snd_pcm_oss_capture_ready(struct snd_pcm_substream *substream)
2728 {
2729 struct snd_pcm_runtime *runtime = substream->runtime;
2730 if (atomic_read(&substream->mmap_count))
2731 return runtime->oss.prev_hw_ptr_period !=
2732 get_hw_ptr_period(runtime);
2733 else
2734 return snd_pcm_capture_avail(runtime) >=
2735 runtime->oss.period_frames;
2736 }
2737
snd_pcm_oss_poll(struct file * file,poll_table * wait)2738 static unsigned int snd_pcm_oss_poll(struct file *file, poll_table * wait)
2739 {
2740 struct snd_pcm_oss_file *pcm_oss_file;
2741 unsigned int mask;
2742 struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2743
2744 pcm_oss_file = file->private_data;
2745
2746 psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2747 csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2748
2749 mask = 0;
2750 if (psubstream != NULL) {
2751 struct snd_pcm_runtime *runtime = psubstream->runtime;
2752 poll_wait(file, &runtime->sleep, wait);
2753 snd_pcm_stream_lock_irq(psubstream);
2754 if (runtime->status->state != SNDRV_PCM_STATE_DRAINING &&
2755 (runtime->status->state != SNDRV_PCM_STATE_RUNNING ||
2756 snd_pcm_oss_playback_ready(psubstream)))
2757 mask |= POLLOUT | POLLWRNORM;
2758 snd_pcm_stream_unlock_irq(psubstream);
2759 }
2760 if (csubstream != NULL) {
2761 struct snd_pcm_runtime *runtime = csubstream->runtime;
2762 snd_pcm_state_t ostate;
2763 poll_wait(file, &runtime->sleep, wait);
2764 snd_pcm_stream_lock_irq(csubstream);
2765 if ((ostate = runtime->status->state) != SNDRV_PCM_STATE_RUNNING ||
2766 snd_pcm_oss_capture_ready(csubstream))
2767 mask |= POLLIN | POLLRDNORM;
2768 snd_pcm_stream_unlock_irq(csubstream);
2769 if (ostate != SNDRV_PCM_STATE_RUNNING && runtime->oss.trigger) {
2770 struct snd_pcm_oss_file ofile;
2771 memset(&ofile, 0, sizeof(ofile));
2772 ofile.streams[SNDRV_PCM_STREAM_CAPTURE] = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2773 runtime->oss.trigger = 0;
2774 snd_pcm_oss_set_trigger(&ofile, PCM_ENABLE_INPUT);
2775 }
2776 }
2777
2778 return mask;
2779 }
2780
snd_pcm_oss_mmap(struct file * file,struct vm_area_struct * area)2781 static int snd_pcm_oss_mmap(struct file *file, struct vm_area_struct *area)
2782 {
2783 struct snd_pcm_oss_file *pcm_oss_file;
2784 struct snd_pcm_substream *substream = NULL;
2785 struct snd_pcm_runtime *runtime;
2786 int err;
2787
2788 #ifdef OSS_DEBUG
2789 pr_debug("pcm_oss: mmap begin\n");
2790 #endif
2791 pcm_oss_file = file->private_data;
2792 switch ((area->vm_flags & (VM_READ | VM_WRITE))) {
2793 case VM_READ | VM_WRITE:
2794 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2795 if (substream)
2796 break;
2797 /* Fall through */
2798 case VM_READ:
2799 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2800 break;
2801 case VM_WRITE:
2802 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2803 break;
2804 default:
2805 return -EINVAL;
2806 }
2807 /* set VM_READ access as well to fix memset() routines that do
2808 reads before writes (to improve performance) */
2809 area->vm_flags |= VM_READ;
2810 if (substream == NULL)
2811 return -ENXIO;
2812 runtime = substream->runtime;
2813 if (!(runtime->info & SNDRV_PCM_INFO_MMAP_VALID))
2814 return -EIO;
2815 if (runtime->info & SNDRV_PCM_INFO_INTERLEAVED)
2816 runtime->access = SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2817 else
2818 return -EIO;
2819
2820 if (runtime->oss.params) {
2821 /* use mutex_trylock() for params_lock for avoiding a deadlock
2822 * between mmap_sem and params_lock taken by
2823 * copy_from/to_user() in snd_pcm_oss_write/read()
2824 */
2825 err = snd_pcm_oss_change_params(substream, true);
2826 if (err < 0)
2827 return err;
2828 }
2829 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
2830 if (runtime->oss.plugin_first != NULL)
2831 return -EIO;
2832 #endif
2833
2834 if (area->vm_pgoff != 0)
2835 return -EINVAL;
2836
2837 err = snd_pcm_mmap_data(substream, file, area);
2838 if (err < 0)
2839 return err;
2840 runtime->oss.mmap_bytes = area->vm_end - area->vm_start;
2841 runtime->silence_threshold = 0;
2842 runtime->silence_size = 0;
2843 #ifdef OSS_DEBUG
2844 pr_debug("pcm_oss: mmap ok, bytes = 0x%x\n",
2845 runtime->oss.mmap_bytes);
2846 #endif
2847 /* In mmap mode we never stop */
2848 runtime->stop_threshold = runtime->boundary;
2849
2850 return 0;
2851 }
2852
2853 #ifdef CONFIG_SND_VERBOSE_PROCFS
2854 /*
2855 * /proc interface
2856 */
2857
snd_pcm_oss_proc_read(struct snd_info_entry * entry,struct snd_info_buffer * buffer)2858 static void snd_pcm_oss_proc_read(struct snd_info_entry *entry,
2859 struct snd_info_buffer *buffer)
2860 {
2861 struct snd_pcm_str *pstr = entry->private_data;
2862 struct snd_pcm_oss_setup *setup = pstr->oss.setup_list;
2863 mutex_lock(&pstr->oss.setup_mutex);
2864 while (setup) {
2865 snd_iprintf(buffer, "%s %u %u%s%s%s%s%s%s\n",
2866 setup->task_name,
2867 setup->periods,
2868 setup->period_size,
2869 setup->disable ? " disable" : "",
2870 setup->direct ? " direct" : "",
2871 setup->block ? " block" : "",
2872 setup->nonblock ? " non-block" : "",
2873 setup->partialfrag ? " partial-frag" : "",
2874 setup->nosilence ? " no-silence" : "");
2875 setup = setup->next;
2876 }
2877 mutex_unlock(&pstr->oss.setup_mutex);
2878 }
2879
snd_pcm_oss_proc_free_setup_list(struct snd_pcm_str * pstr)2880 static void snd_pcm_oss_proc_free_setup_list(struct snd_pcm_str * pstr)
2881 {
2882 struct snd_pcm_oss_setup *setup, *setupn;
2883
2884 for (setup = pstr->oss.setup_list, pstr->oss.setup_list = NULL;
2885 setup; setup = setupn) {
2886 setupn = setup->next;
2887 kfree(setup->task_name);
2888 kfree(setup);
2889 }
2890 pstr->oss.setup_list = NULL;
2891 }
2892
snd_pcm_oss_proc_write(struct snd_info_entry * entry,struct snd_info_buffer * buffer)2893 static void snd_pcm_oss_proc_write(struct snd_info_entry *entry,
2894 struct snd_info_buffer *buffer)
2895 {
2896 struct snd_pcm_str *pstr = entry->private_data;
2897 char line[128], str[32], task_name[32];
2898 const char *ptr;
2899 int idx1;
2900 struct snd_pcm_oss_setup *setup, *setup1, template;
2901
2902 while (!snd_info_get_line(buffer, line, sizeof(line))) {
2903 mutex_lock(&pstr->oss.setup_mutex);
2904 memset(&template, 0, sizeof(template));
2905 ptr = snd_info_get_str(task_name, line, sizeof(task_name));
2906 if (!strcmp(task_name, "clear") || !strcmp(task_name, "erase")) {
2907 snd_pcm_oss_proc_free_setup_list(pstr);
2908 mutex_unlock(&pstr->oss.setup_mutex);
2909 continue;
2910 }
2911 for (setup = pstr->oss.setup_list; setup; setup = setup->next) {
2912 if (!strcmp(setup->task_name, task_name)) {
2913 template = *setup;
2914 break;
2915 }
2916 }
2917 ptr = snd_info_get_str(str, ptr, sizeof(str));
2918 template.periods = simple_strtoul(str, NULL, 10);
2919 ptr = snd_info_get_str(str, ptr, sizeof(str));
2920 template.period_size = simple_strtoul(str, NULL, 10);
2921 for (idx1 = 31; idx1 >= 0; idx1--)
2922 if (template.period_size & (1 << idx1))
2923 break;
2924 for (idx1--; idx1 >= 0; idx1--)
2925 template.period_size &= ~(1 << idx1);
2926 do {
2927 ptr = snd_info_get_str(str, ptr, sizeof(str));
2928 if (!strcmp(str, "disable")) {
2929 template.disable = 1;
2930 } else if (!strcmp(str, "direct")) {
2931 template.direct = 1;
2932 } else if (!strcmp(str, "block")) {
2933 template.block = 1;
2934 } else if (!strcmp(str, "non-block")) {
2935 template.nonblock = 1;
2936 } else if (!strcmp(str, "partial-frag")) {
2937 template.partialfrag = 1;
2938 } else if (!strcmp(str, "no-silence")) {
2939 template.nosilence = 1;
2940 } else if (!strcmp(str, "buggy-ptr")) {
2941 template.buggyptr = 1;
2942 }
2943 } while (*str);
2944 if (setup == NULL) {
2945 setup = kmalloc(sizeof(*setup), GFP_KERNEL);
2946 if (! setup) {
2947 buffer->error = -ENOMEM;
2948 mutex_unlock(&pstr->oss.setup_mutex);
2949 return;
2950 }
2951 if (pstr->oss.setup_list == NULL)
2952 pstr->oss.setup_list = setup;
2953 else {
2954 for (setup1 = pstr->oss.setup_list;
2955 setup1->next; setup1 = setup1->next);
2956 setup1->next = setup;
2957 }
2958 template.task_name = kstrdup(task_name, GFP_KERNEL);
2959 if (! template.task_name) {
2960 kfree(setup);
2961 buffer->error = -ENOMEM;
2962 mutex_unlock(&pstr->oss.setup_mutex);
2963 return;
2964 }
2965 }
2966 *setup = template;
2967 mutex_unlock(&pstr->oss.setup_mutex);
2968 }
2969 }
2970
snd_pcm_oss_proc_init(struct snd_pcm * pcm)2971 static void snd_pcm_oss_proc_init(struct snd_pcm *pcm)
2972 {
2973 int stream;
2974 for (stream = 0; stream < 2; ++stream) {
2975 struct snd_info_entry *entry;
2976 struct snd_pcm_str *pstr = &pcm->streams[stream];
2977 if (pstr->substream_count == 0)
2978 continue;
2979 if ((entry = snd_info_create_card_entry(pcm->card, "oss", pstr->proc_root)) != NULL) {
2980 entry->content = SNDRV_INFO_CONTENT_TEXT;
2981 entry->mode = S_IFREG | S_IRUGO | S_IWUSR;
2982 entry->c.text.read = snd_pcm_oss_proc_read;
2983 entry->c.text.write = snd_pcm_oss_proc_write;
2984 entry->private_data = pstr;
2985 if (snd_info_register(entry) < 0) {
2986 snd_info_free_entry(entry);
2987 entry = NULL;
2988 }
2989 }
2990 pstr->oss.proc_entry = entry;
2991 }
2992 }
2993
snd_pcm_oss_proc_done(struct snd_pcm * pcm)2994 static void snd_pcm_oss_proc_done(struct snd_pcm *pcm)
2995 {
2996 int stream;
2997 for (stream = 0; stream < 2; ++stream) {
2998 struct snd_pcm_str *pstr = &pcm->streams[stream];
2999 snd_info_free_entry(pstr->oss.proc_entry);
3000 pstr->oss.proc_entry = NULL;
3001 snd_pcm_oss_proc_free_setup_list(pstr);
3002 }
3003 }
3004 #else /* !CONFIG_SND_VERBOSE_PROCFS */
3005 #define snd_pcm_oss_proc_init(pcm)
3006 #define snd_pcm_oss_proc_done(pcm)
3007 #endif /* CONFIG_SND_VERBOSE_PROCFS */
3008
3009 /*
3010 * ENTRY functions
3011 */
3012
3013 static const struct file_operations snd_pcm_oss_f_reg =
3014 {
3015 .owner = THIS_MODULE,
3016 .read = snd_pcm_oss_read,
3017 .write = snd_pcm_oss_write,
3018 .open = snd_pcm_oss_open,
3019 .release = snd_pcm_oss_release,
3020 .llseek = no_llseek,
3021 .poll = snd_pcm_oss_poll,
3022 .unlocked_ioctl = snd_pcm_oss_ioctl,
3023 .compat_ioctl = snd_pcm_oss_ioctl_compat,
3024 .mmap = snd_pcm_oss_mmap,
3025 };
3026
register_oss_dsp(struct snd_pcm * pcm,int index)3027 static void register_oss_dsp(struct snd_pcm *pcm, int index)
3028 {
3029 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3030 pcm->card, index, &snd_pcm_oss_f_reg,
3031 pcm) < 0) {
3032 pcm_err(pcm, "unable to register OSS PCM device %i:%i\n",
3033 pcm->card->number, pcm->device);
3034 }
3035 }
3036
snd_pcm_oss_register_minor(struct snd_pcm * pcm)3037 static int snd_pcm_oss_register_minor(struct snd_pcm *pcm)
3038 {
3039 pcm->oss.reg = 0;
3040 if (dsp_map[pcm->card->number] == (int)pcm->device) {
3041 char name[128];
3042 int duplex;
3043 register_oss_dsp(pcm, 0);
3044 duplex = (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count > 0 &&
3045 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count &&
3046 !(pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX));
3047 sprintf(name, "%s%s", pcm->name, duplex ? " (DUPLEX)" : "");
3048 #ifdef SNDRV_OSS_INFO_DEV_AUDIO
3049 snd_oss_info_register(SNDRV_OSS_INFO_DEV_AUDIO,
3050 pcm->card->number,
3051 name);
3052 #endif
3053 pcm->oss.reg++;
3054 pcm->oss.reg_mask |= 1;
3055 }
3056 if (adsp_map[pcm->card->number] == (int)pcm->device) {
3057 register_oss_dsp(pcm, 1);
3058 pcm->oss.reg++;
3059 pcm->oss.reg_mask |= 2;
3060 }
3061
3062 if (pcm->oss.reg)
3063 snd_pcm_oss_proc_init(pcm);
3064
3065 return 0;
3066 }
3067
snd_pcm_oss_disconnect_minor(struct snd_pcm * pcm)3068 static int snd_pcm_oss_disconnect_minor(struct snd_pcm *pcm)
3069 {
3070 if (pcm->oss.reg) {
3071 if (pcm->oss.reg_mask & 1) {
3072 pcm->oss.reg_mask &= ~1;
3073 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3074 pcm->card, 0);
3075 }
3076 if (pcm->oss.reg_mask & 2) {
3077 pcm->oss.reg_mask &= ~2;
3078 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3079 pcm->card, 1);
3080 }
3081 if (dsp_map[pcm->card->number] == (int)pcm->device) {
3082 #ifdef SNDRV_OSS_INFO_DEV_AUDIO
3083 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_AUDIO, pcm->card->number);
3084 #endif
3085 }
3086 pcm->oss.reg = 0;
3087 }
3088 return 0;
3089 }
3090
snd_pcm_oss_unregister_minor(struct snd_pcm * pcm)3091 static int snd_pcm_oss_unregister_minor(struct snd_pcm *pcm)
3092 {
3093 snd_pcm_oss_disconnect_minor(pcm);
3094 snd_pcm_oss_proc_done(pcm);
3095 return 0;
3096 }
3097
3098 static struct snd_pcm_notify snd_pcm_oss_notify =
3099 {
3100 .n_register = snd_pcm_oss_register_minor,
3101 .n_disconnect = snd_pcm_oss_disconnect_minor,
3102 .n_unregister = snd_pcm_oss_unregister_minor,
3103 };
3104
alsa_pcm_oss_init(void)3105 static int __init alsa_pcm_oss_init(void)
3106 {
3107 int i;
3108 int err;
3109
3110 /* check device map table */
3111 for (i = 0; i < SNDRV_CARDS; i++) {
3112 if (dsp_map[i] < 0 || dsp_map[i] >= SNDRV_PCM_DEVICES) {
3113 pr_err("ALSA: pcm_oss: invalid dsp_map[%d] = %d\n",
3114 i, dsp_map[i]);
3115 dsp_map[i] = 0;
3116 }
3117 if (adsp_map[i] < 0 || adsp_map[i] >= SNDRV_PCM_DEVICES) {
3118 pr_err("ALSA: pcm_oss: invalid adsp_map[%d] = %d\n",
3119 i, adsp_map[i]);
3120 adsp_map[i] = 1;
3121 }
3122 }
3123 if ((err = snd_pcm_notify(&snd_pcm_oss_notify, 0)) < 0)
3124 return err;
3125 return 0;
3126 }
3127
alsa_pcm_oss_exit(void)3128 static void __exit alsa_pcm_oss_exit(void)
3129 {
3130 snd_pcm_notify(&snd_pcm_oss_notify, 1);
3131 }
3132
3133 module_init(alsa_pcm_oss_init)
3134 module_exit(alsa_pcm_oss_exit)
3135