1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Digital Audio (PCM) abstract layer / OSS compatible
4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
5 */
6
7 #if 0
8 #define PLUGIN_DEBUG
9 #endif
10 #if 0
11 #define OSS_DEBUG
12 #endif
13
14 #include <linux/init.h>
15 #include <linux/slab.h>
16 #include <linux/sched/signal.h>
17 #include <linux/time.h>
18 #include <linux/vmalloc.h>
19 #include <linux/module.h>
20 #include <linux/math64.h>
21 #include <linux/string.h>
22 #include <linux/compat.h>
23 #include <sound/core.h>
24 #include <sound/minors.h>
25 #include <sound/pcm.h>
26 #include <sound/pcm_params.h>
27 #include "pcm_plugin.h"
28 #include <sound/info.h>
29 #include <linux/soundcard.h>
30 #include <sound/initval.h>
31 #include <sound/mixer_oss.h>
32
33 #define OSS_ALSAEMULVER _SIOR ('M', 249, int)
34
35 static int dsp_map[SNDRV_CARDS];
36 static int adsp_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
37 static bool nonblock_open = 1;
38
39 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
40 MODULE_DESCRIPTION("PCM OSS emulation for ALSA.");
41 MODULE_LICENSE("GPL");
42 module_param_array(dsp_map, int, NULL, 0444);
43 MODULE_PARM_DESC(dsp_map, "PCM device number assigned to 1st OSS device.");
44 module_param_array(adsp_map, int, NULL, 0444);
45 MODULE_PARM_DESC(adsp_map, "PCM device number assigned to 2nd OSS device.");
46 module_param(nonblock_open, bool, 0644);
47 MODULE_PARM_DESC(nonblock_open, "Don't block opening busy PCM devices.");
48 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_PCM);
49 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_PCM1);
50
51 static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file);
52 static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file);
53 static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file);
54
55 /*
56 * helper functions to process hw_params
57 */
snd_interval_refine_min(struct snd_interval * i,unsigned int min,int openmin)58 static int snd_interval_refine_min(struct snd_interval *i, unsigned int min, int openmin)
59 {
60 int changed = 0;
61 if (i->min < min) {
62 i->min = min;
63 i->openmin = openmin;
64 changed = 1;
65 } else if (i->min == min && !i->openmin && openmin) {
66 i->openmin = 1;
67 changed = 1;
68 }
69 if (i->integer) {
70 if (i->openmin) {
71 i->min++;
72 i->openmin = 0;
73 }
74 }
75 if (snd_interval_checkempty(i)) {
76 snd_interval_none(i);
77 return -EINVAL;
78 }
79 return changed;
80 }
81
snd_interval_refine_max(struct snd_interval * i,unsigned int max,int openmax)82 static int snd_interval_refine_max(struct snd_interval *i, unsigned int max, int openmax)
83 {
84 int changed = 0;
85 if (i->max > max) {
86 i->max = max;
87 i->openmax = openmax;
88 changed = 1;
89 } else if (i->max == max && !i->openmax && openmax) {
90 i->openmax = 1;
91 changed = 1;
92 }
93 if (i->integer) {
94 if (i->openmax) {
95 i->max--;
96 i->openmax = 0;
97 }
98 }
99 if (snd_interval_checkempty(i)) {
100 snd_interval_none(i);
101 return -EINVAL;
102 }
103 return changed;
104 }
105
snd_interval_refine_set(struct snd_interval * i,unsigned int val)106 static int snd_interval_refine_set(struct snd_interval *i, unsigned int val)
107 {
108 struct snd_interval t;
109 t.empty = 0;
110 t.min = t.max = val;
111 t.openmin = t.openmax = 0;
112 t.integer = 1;
113 return snd_interval_refine(i, &t);
114 }
115
116 /**
117 * snd_pcm_hw_param_value_min
118 * @params: the hw_params instance
119 * @var: parameter to retrieve
120 * @dir: pointer to the direction (-1,0,1) or NULL
121 *
122 * Return the minimum value for field PAR.
123 */
124 static unsigned int
snd_pcm_hw_param_value_min(const struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,int * dir)125 snd_pcm_hw_param_value_min(const struct snd_pcm_hw_params *params,
126 snd_pcm_hw_param_t var, int *dir)
127 {
128 if (hw_is_mask(var)) {
129 if (dir)
130 *dir = 0;
131 return snd_mask_min(hw_param_mask_c(params, var));
132 }
133 if (hw_is_interval(var)) {
134 const struct snd_interval *i = hw_param_interval_c(params, var);
135 if (dir)
136 *dir = i->openmin;
137 return snd_interval_min(i);
138 }
139 return -EINVAL;
140 }
141
142 /**
143 * snd_pcm_hw_param_value_max
144 * @params: the hw_params instance
145 * @var: parameter to retrieve
146 * @dir: pointer to the direction (-1,0,1) or NULL
147 *
148 * Return the maximum value for field PAR.
149 */
150 static int
snd_pcm_hw_param_value_max(const struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,int * dir)151 snd_pcm_hw_param_value_max(const struct snd_pcm_hw_params *params,
152 snd_pcm_hw_param_t var, int *dir)
153 {
154 if (hw_is_mask(var)) {
155 if (dir)
156 *dir = 0;
157 return snd_mask_max(hw_param_mask_c(params, var));
158 }
159 if (hw_is_interval(var)) {
160 const struct snd_interval *i = hw_param_interval_c(params, var);
161 if (dir)
162 *dir = - (int) i->openmax;
163 return snd_interval_max(i);
164 }
165 return -EINVAL;
166 }
167
_snd_pcm_hw_param_mask(struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,const struct snd_mask * val)168 static int _snd_pcm_hw_param_mask(struct snd_pcm_hw_params *params,
169 snd_pcm_hw_param_t var,
170 const struct snd_mask *val)
171 {
172 int changed;
173 changed = snd_mask_refine(hw_param_mask(params, var), val);
174 if (changed > 0) {
175 params->cmask |= 1 << var;
176 params->rmask |= 1 << var;
177 }
178 return changed;
179 }
180
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)181 static int snd_pcm_hw_param_mask(struct snd_pcm_substream *pcm,
182 struct snd_pcm_hw_params *params,
183 snd_pcm_hw_param_t var,
184 const struct snd_mask *val)
185 {
186 int changed = _snd_pcm_hw_param_mask(params, var, val);
187 if (changed < 0)
188 return changed;
189 if (params->rmask) {
190 int err = snd_pcm_hw_refine(pcm, params);
191 if (err < 0)
192 return err;
193 }
194 return 0;
195 }
196
_snd_pcm_hw_param_min(struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,unsigned int val,int dir)197 static int _snd_pcm_hw_param_min(struct snd_pcm_hw_params *params,
198 snd_pcm_hw_param_t var, unsigned int val,
199 int dir)
200 {
201 int changed;
202 int open = 0;
203 if (dir) {
204 if (dir > 0) {
205 open = 1;
206 } else if (dir < 0) {
207 if (val > 0) {
208 open = 1;
209 val--;
210 }
211 }
212 }
213 if (hw_is_mask(var))
214 changed = snd_mask_refine_min(hw_param_mask(params, var),
215 val + !!open);
216 else if (hw_is_interval(var))
217 changed = snd_interval_refine_min(hw_param_interval(params, var),
218 val, open);
219 else
220 return -EINVAL;
221 if (changed > 0) {
222 params->cmask |= 1 << var;
223 params->rmask |= 1 << var;
224 }
225 return changed;
226 }
227
228 /**
229 * snd_pcm_hw_param_min
230 * @pcm: PCM instance
231 * @params: the hw_params instance
232 * @var: parameter to retrieve
233 * @val: minimal value
234 * @dir: pointer to the direction (-1,0,1) or NULL
235 *
236 * Inside configuration space defined by PARAMS remove from PAR all
237 * values < VAL. Reduce configuration space accordingly.
238 * Return new minimum or -EINVAL if the configuration space is empty
239 */
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)240 static int snd_pcm_hw_param_min(struct snd_pcm_substream *pcm,
241 struct snd_pcm_hw_params *params,
242 snd_pcm_hw_param_t var, unsigned int val,
243 int *dir)
244 {
245 int changed = _snd_pcm_hw_param_min(params, var, val, dir ? *dir : 0);
246 if (changed < 0)
247 return changed;
248 if (params->rmask) {
249 int err = snd_pcm_hw_refine(pcm, params);
250 if (err < 0)
251 return err;
252 }
253 return snd_pcm_hw_param_value_min(params, var, dir);
254 }
255
_snd_pcm_hw_param_max(struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,unsigned int val,int dir)256 static int _snd_pcm_hw_param_max(struct snd_pcm_hw_params *params,
257 snd_pcm_hw_param_t var, unsigned int val,
258 int dir)
259 {
260 int changed;
261 int open = 0;
262 if (dir) {
263 if (dir < 0) {
264 open = 1;
265 } else if (dir > 0) {
266 open = 1;
267 val++;
268 }
269 }
270 if (hw_is_mask(var)) {
271 if (val == 0 && open) {
272 snd_mask_none(hw_param_mask(params, var));
273 changed = -EINVAL;
274 } else
275 changed = snd_mask_refine_max(hw_param_mask(params, var),
276 val - !!open);
277 } else if (hw_is_interval(var))
278 changed = snd_interval_refine_max(hw_param_interval(params, var),
279 val, open);
280 else
281 return -EINVAL;
282 if (changed > 0) {
283 params->cmask |= 1 << var;
284 params->rmask |= 1 << var;
285 }
286 return changed;
287 }
288
289 /**
290 * snd_pcm_hw_param_max
291 * @pcm: PCM instance
292 * @params: the hw_params instance
293 * @var: parameter to retrieve
294 * @val: maximal value
295 * @dir: pointer to the direction (-1,0,1) or NULL
296 *
297 * Inside configuration space defined by PARAMS remove from PAR all
298 * values >= VAL + 1. Reduce configuration space accordingly.
299 * Return new maximum or -EINVAL if the configuration space is empty
300 */
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)301 static int snd_pcm_hw_param_max(struct snd_pcm_substream *pcm,
302 struct snd_pcm_hw_params *params,
303 snd_pcm_hw_param_t var, unsigned int val,
304 int *dir)
305 {
306 int changed = _snd_pcm_hw_param_max(params, var, val, dir ? *dir : 0);
307 if (changed < 0)
308 return changed;
309 if (params->rmask) {
310 int err = snd_pcm_hw_refine(pcm, params);
311 if (err < 0)
312 return err;
313 }
314 return snd_pcm_hw_param_value_max(params, var, dir);
315 }
316
boundary_sub(int a,int adir,int b,int bdir,int * c,int * cdir)317 static int boundary_sub(int a, int adir,
318 int b, int bdir,
319 int *c, int *cdir)
320 {
321 adir = adir < 0 ? -1 : (adir > 0 ? 1 : 0);
322 bdir = bdir < 0 ? -1 : (bdir > 0 ? 1 : 0);
323 *c = a - b;
324 *cdir = adir - bdir;
325 if (*cdir == -2) {
326 (*c)--;
327 } else if (*cdir == 2) {
328 (*c)++;
329 }
330 return 0;
331 }
332
boundary_lt(unsigned int a,int adir,unsigned int b,int bdir)333 static int boundary_lt(unsigned int a, int adir,
334 unsigned int b, int bdir)
335 {
336 if (adir < 0) {
337 a--;
338 adir = 1;
339 } else if (adir > 0)
340 adir = 1;
341 if (bdir < 0) {
342 b--;
343 bdir = 1;
344 } else if (bdir > 0)
345 bdir = 1;
346 return a < b || (a == b && adir < bdir);
347 }
348
349 /* Return 1 if min is nearer to best than max */
boundary_nearer(int min,int mindir,int best,int bestdir,int max,int maxdir)350 static int boundary_nearer(int min, int mindir,
351 int best, int bestdir,
352 int max, int maxdir)
353 {
354 int dmin, dmindir;
355 int dmax, dmaxdir;
356 boundary_sub(best, bestdir, min, mindir, &dmin, &dmindir);
357 boundary_sub(max, maxdir, best, bestdir, &dmax, &dmaxdir);
358 return boundary_lt(dmin, dmindir, dmax, dmaxdir);
359 }
360
361 /**
362 * snd_pcm_hw_param_near
363 * @pcm: PCM instance
364 * @params: the hw_params instance
365 * @var: parameter to retrieve
366 * @best: value to set
367 * @dir: pointer to the direction (-1,0,1) or NULL
368 *
369 * Inside configuration space defined by PARAMS set PAR to the available value
370 * nearest to VAL. Reduce configuration space accordingly.
371 * This function cannot be called for SNDRV_PCM_HW_PARAM_ACCESS,
372 * SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT.
373 * Return the value found.
374 */
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)375 static int snd_pcm_hw_param_near(struct snd_pcm_substream *pcm,
376 struct snd_pcm_hw_params *params,
377 snd_pcm_hw_param_t var, unsigned int best,
378 int *dir)
379 {
380 struct snd_pcm_hw_params *save = NULL;
381 int v;
382 unsigned int saved_min;
383 int last = 0;
384 int min, max;
385 int mindir, maxdir;
386 int valdir = dir ? *dir : 0;
387 /* FIXME */
388 if (best > INT_MAX)
389 best = INT_MAX;
390 min = max = best;
391 mindir = maxdir = valdir;
392 if (maxdir > 0)
393 maxdir = 0;
394 else if (maxdir == 0)
395 maxdir = -1;
396 else {
397 maxdir = 1;
398 max--;
399 }
400 save = kmalloc(sizeof(*save), GFP_KERNEL);
401 if (save == NULL)
402 return -ENOMEM;
403 *save = *params;
404 saved_min = min;
405 min = snd_pcm_hw_param_min(pcm, params, var, min, &mindir);
406 if (min >= 0) {
407 struct snd_pcm_hw_params *params1;
408 if (max < 0)
409 goto _end;
410 if ((unsigned int)min == saved_min && mindir == valdir)
411 goto _end;
412 params1 = kmalloc(sizeof(*params1), GFP_KERNEL);
413 if (params1 == NULL) {
414 kfree(save);
415 return -ENOMEM;
416 }
417 *params1 = *save;
418 max = snd_pcm_hw_param_max(pcm, params1, var, max, &maxdir);
419 if (max < 0) {
420 kfree(params1);
421 goto _end;
422 }
423 if (boundary_nearer(max, maxdir, best, valdir, min, mindir)) {
424 *params = *params1;
425 last = 1;
426 }
427 kfree(params1);
428 } else {
429 *params = *save;
430 max = snd_pcm_hw_param_max(pcm, params, var, max, &maxdir);
431 if (max < 0) {
432 kfree(save);
433 return max;
434 }
435 last = 1;
436 }
437 _end:
438 kfree(save);
439 if (last)
440 v = snd_pcm_hw_param_last(pcm, params, var, dir);
441 else
442 v = snd_pcm_hw_param_first(pcm, params, var, dir);
443 return v;
444 }
445
_snd_pcm_hw_param_set(struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var,unsigned int val,int dir)446 static int _snd_pcm_hw_param_set(struct snd_pcm_hw_params *params,
447 snd_pcm_hw_param_t var, unsigned int val,
448 int dir)
449 {
450 int changed;
451 if (hw_is_mask(var)) {
452 struct snd_mask *m = hw_param_mask(params, var);
453 if (val == 0 && dir < 0) {
454 changed = -EINVAL;
455 snd_mask_none(m);
456 } else {
457 if (dir > 0)
458 val++;
459 else if (dir < 0)
460 val--;
461 changed = snd_mask_refine_set(hw_param_mask(params, var), val);
462 }
463 } else if (hw_is_interval(var)) {
464 struct snd_interval *i = hw_param_interval(params, var);
465 if (val == 0 && dir < 0) {
466 changed = -EINVAL;
467 snd_interval_none(i);
468 } else if (dir == 0)
469 changed = snd_interval_refine_set(i, val);
470 else {
471 struct snd_interval t;
472 t.openmin = 1;
473 t.openmax = 1;
474 t.empty = 0;
475 t.integer = 0;
476 if (dir < 0) {
477 t.min = val - 1;
478 t.max = val;
479 } else {
480 t.min = val;
481 t.max = val+1;
482 }
483 changed = snd_interval_refine(i, &t);
484 }
485 } else
486 return -EINVAL;
487 if (changed > 0) {
488 params->cmask |= 1 << var;
489 params->rmask |= 1 << var;
490 }
491 return changed;
492 }
493
494 /**
495 * snd_pcm_hw_param_set
496 * @pcm: PCM instance
497 * @params: the hw_params instance
498 * @var: parameter to retrieve
499 * @val: value to set
500 * @dir: pointer to the direction (-1,0,1) or NULL
501 *
502 * Inside configuration space defined by PARAMS remove from PAR all
503 * values != VAL. Reduce configuration space accordingly.
504 * Return VAL or -EINVAL if the configuration space is empty
505 */
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)506 static int snd_pcm_hw_param_set(struct snd_pcm_substream *pcm,
507 struct snd_pcm_hw_params *params,
508 snd_pcm_hw_param_t var, unsigned int val,
509 int dir)
510 {
511 int changed = _snd_pcm_hw_param_set(params, var, val, dir);
512 if (changed < 0)
513 return changed;
514 if (params->rmask) {
515 int err = snd_pcm_hw_refine(pcm, params);
516 if (err < 0)
517 return err;
518 }
519 return snd_pcm_hw_param_value(params, var, NULL);
520 }
521
_snd_pcm_hw_param_setinteger(struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var)522 static int _snd_pcm_hw_param_setinteger(struct snd_pcm_hw_params *params,
523 snd_pcm_hw_param_t var)
524 {
525 int changed;
526 changed = snd_interval_setinteger(hw_param_interval(params, var));
527 if (changed > 0) {
528 params->cmask |= 1 << var;
529 params->rmask |= 1 << var;
530 }
531 return changed;
532 }
533
534 /*
535 * plugin
536 */
537
538 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
snd_pcm_oss_plugin_clear(struct snd_pcm_substream * substream)539 static int snd_pcm_oss_plugin_clear(struct snd_pcm_substream *substream)
540 {
541 struct snd_pcm_runtime *runtime = substream->runtime;
542 struct snd_pcm_plugin *plugin, *next;
543
544 plugin = runtime->oss.plugin_first;
545 while (plugin) {
546 next = plugin->next;
547 snd_pcm_plugin_free(plugin);
548 plugin = next;
549 }
550 runtime->oss.plugin_first = runtime->oss.plugin_last = NULL;
551 return 0;
552 }
553
snd_pcm_plugin_insert(struct snd_pcm_plugin * plugin)554 static int snd_pcm_plugin_insert(struct snd_pcm_plugin *plugin)
555 {
556 struct snd_pcm_runtime *runtime = plugin->plug->runtime;
557 plugin->next = runtime->oss.plugin_first;
558 plugin->prev = NULL;
559 if (runtime->oss.plugin_first) {
560 runtime->oss.plugin_first->prev = plugin;
561 runtime->oss.plugin_first = plugin;
562 } else {
563 runtime->oss.plugin_last =
564 runtime->oss.plugin_first = plugin;
565 }
566 return 0;
567 }
568
snd_pcm_plugin_append(struct snd_pcm_plugin * plugin)569 int snd_pcm_plugin_append(struct snd_pcm_plugin *plugin)
570 {
571 struct snd_pcm_runtime *runtime = plugin->plug->runtime;
572 plugin->next = NULL;
573 plugin->prev = runtime->oss.plugin_last;
574 if (runtime->oss.plugin_last) {
575 runtime->oss.plugin_last->next = plugin;
576 runtime->oss.plugin_last = plugin;
577 } else {
578 runtime->oss.plugin_last =
579 runtime->oss.plugin_first = plugin;
580 }
581 return 0;
582 }
583 #endif /* CONFIG_SND_PCM_OSS_PLUGINS */
584
snd_pcm_oss_bytes(struct snd_pcm_substream * substream,long frames)585 static long snd_pcm_oss_bytes(struct snd_pcm_substream *substream, long frames)
586 {
587 struct snd_pcm_runtime *runtime = substream->runtime;
588 long buffer_size = snd_pcm_lib_buffer_bytes(substream);
589 long bytes = frames_to_bytes(runtime, frames);
590 if (buffer_size == runtime->oss.buffer_bytes)
591 return bytes;
592 #if BITS_PER_LONG >= 64
593 return runtime->oss.buffer_bytes * bytes / buffer_size;
594 #else
595 {
596 u64 bsize = (u64)runtime->oss.buffer_bytes * (u64)bytes;
597 return div_u64(bsize, buffer_size);
598 }
599 #endif
600 }
601
snd_pcm_alsa_frames(struct snd_pcm_substream * substream,long bytes)602 static long snd_pcm_alsa_frames(struct snd_pcm_substream *substream, long bytes)
603 {
604 struct snd_pcm_runtime *runtime = substream->runtime;
605 long buffer_size = snd_pcm_lib_buffer_bytes(substream);
606 if (buffer_size == runtime->oss.buffer_bytes)
607 return bytes_to_frames(runtime, bytes);
608 return bytes_to_frames(runtime, (buffer_size * bytes) / runtime->oss.buffer_bytes);
609 }
610
611 static inline
get_hw_ptr_period(struct snd_pcm_runtime * runtime)612 snd_pcm_uframes_t get_hw_ptr_period(struct snd_pcm_runtime *runtime)
613 {
614 return runtime->hw_ptr_interrupt;
615 }
616
617 /* define extended formats in the recent OSS versions (if any) */
618 /* linear formats */
619 #define AFMT_S32_LE 0x00001000
620 #define AFMT_S32_BE 0x00002000
621 #define AFMT_S24_LE 0x00008000
622 #define AFMT_S24_BE 0x00010000
623 #define AFMT_S24_PACKED 0x00040000
624
625 /* other supported formats */
626 #define AFMT_FLOAT 0x00004000
627 #define AFMT_SPDIF_RAW 0x00020000
628
629 /* unsupported formats */
630 #define AFMT_AC3 0x00000400
631 #define AFMT_VORBIS 0x00000800
632
snd_pcm_oss_format_from(int format)633 static snd_pcm_format_t snd_pcm_oss_format_from(int format)
634 {
635 switch (format) {
636 case AFMT_MU_LAW: return SNDRV_PCM_FORMAT_MU_LAW;
637 case AFMT_A_LAW: return SNDRV_PCM_FORMAT_A_LAW;
638 case AFMT_IMA_ADPCM: return SNDRV_PCM_FORMAT_IMA_ADPCM;
639 case AFMT_U8: return SNDRV_PCM_FORMAT_U8;
640 case AFMT_S16_LE: return SNDRV_PCM_FORMAT_S16_LE;
641 case AFMT_S16_BE: return SNDRV_PCM_FORMAT_S16_BE;
642 case AFMT_S8: return SNDRV_PCM_FORMAT_S8;
643 case AFMT_U16_LE: return SNDRV_PCM_FORMAT_U16_LE;
644 case AFMT_U16_BE: return SNDRV_PCM_FORMAT_U16_BE;
645 case AFMT_MPEG: return SNDRV_PCM_FORMAT_MPEG;
646 case AFMT_S32_LE: return SNDRV_PCM_FORMAT_S32_LE;
647 case AFMT_S32_BE: return SNDRV_PCM_FORMAT_S32_BE;
648 case AFMT_S24_LE: return SNDRV_PCM_FORMAT_S24_LE;
649 case AFMT_S24_BE: return SNDRV_PCM_FORMAT_S24_BE;
650 case AFMT_S24_PACKED: return SNDRV_PCM_FORMAT_S24_3LE;
651 case AFMT_FLOAT: return SNDRV_PCM_FORMAT_FLOAT;
652 case AFMT_SPDIF_RAW: return SNDRV_PCM_FORMAT_IEC958_SUBFRAME;
653 default: return SNDRV_PCM_FORMAT_U8;
654 }
655 }
656
snd_pcm_oss_format_to(snd_pcm_format_t format)657 static int snd_pcm_oss_format_to(snd_pcm_format_t format)
658 {
659 switch (format) {
660 case SNDRV_PCM_FORMAT_MU_LAW: return AFMT_MU_LAW;
661 case SNDRV_PCM_FORMAT_A_LAW: return AFMT_A_LAW;
662 case SNDRV_PCM_FORMAT_IMA_ADPCM: return AFMT_IMA_ADPCM;
663 case SNDRV_PCM_FORMAT_U8: return AFMT_U8;
664 case SNDRV_PCM_FORMAT_S16_LE: return AFMT_S16_LE;
665 case SNDRV_PCM_FORMAT_S16_BE: return AFMT_S16_BE;
666 case SNDRV_PCM_FORMAT_S8: return AFMT_S8;
667 case SNDRV_PCM_FORMAT_U16_LE: return AFMT_U16_LE;
668 case SNDRV_PCM_FORMAT_U16_BE: return AFMT_U16_BE;
669 case SNDRV_PCM_FORMAT_MPEG: return AFMT_MPEG;
670 case SNDRV_PCM_FORMAT_S32_LE: return AFMT_S32_LE;
671 case SNDRV_PCM_FORMAT_S32_BE: return AFMT_S32_BE;
672 case SNDRV_PCM_FORMAT_S24_LE: return AFMT_S24_LE;
673 case SNDRV_PCM_FORMAT_S24_BE: return AFMT_S24_BE;
674 case SNDRV_PCM_FORMAT_S24_3LE: return AFMT_S24_PACKED;
675 case SNDRV_PCM_FORMAT_FLOAT: return AFMT_FLOAT;
676 case SNDRV_PCM_FORMAT_IEC958_SUBFRAME: return AFMT_SPDIF_RAW;
677 default: return -EINVAL;
678 }
679 }
680
snd_pcm_oss_period_size(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * oss_params,struct snd_pcm_hw_params * slave_params)681 static int snd_pcm_oss_period_size(struct snd_pcm_substream *substream,
682 struct snd_pcm_hw_params *oss_params,
683 struct snd_pcm_hw_params *slave_params)
684 {
685 ssize_t s;
686 ssize_t oss_buffer_size;
687 ssize_t oss_period_size, oss_periods;
688 ssize_t min_period_size, max_period_size;
689 struct snd_pcm_runtime *runtime = substream->runtime;
690 size_t oss_frame_size;
691
692 oss_frame_size = snd_pcm_format_physical_width(params_format(oss_params)) *
693 params_channels(oss_params) / 8;
694
695 oss_buffer_size = snd_pcm_hw_param_value_max(slave_params,
696 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
697 NULL);
698 if (oss_buffer_size <= 0)
699 return -EINVAL;
700 oss_buffer_size = snd_pcm_plug_client_size(substream,
701 oss_buffer_size * oss_frame_size);
702 if (oss_buffer_size <= 0)
703 return -EINVAL;
704 oss_buffer_size = rounddown_pow_of_two(oss_buffer_size);
705 if (atomic_read(&substream->mmap_count)) {
706 if (oss_buffer_size > runtime->oss.mmap_bytes)
707 oss_buffer_size = runtime->oss.mmap_bytes;
708 }
709
710 if (substream->oss.setup.period_size > 16)
711 oss_period_size = substream->oss.setup.period_size;
712 else if (runtime->oss.fragshift) {
713 oss_period_size = 1 << runtime->oss.fragshift;
714 if (oss_period_size > oss_buffer_size / 2)
715 oss_period_size = oss_buffer_size / 2;
716 } else {
717 int sd;
718 size_t bytes_per_sec = params_rate(oss_params) * snd_pcm_format_physical_width(params_format(oss_params)) * params_channels(oss_params) / 8;
719
720 oss_period_size = oss_buffer_size;
721 do {
722 oss_period_size /= 2;
723 } while (oss_period_size > bytes_per_sec);
724 if (runtime->oss.subdivision == 0) {
725 sd = 4;
726 if (oss_period_size / sd > 4096)
727 sd *= 2;
728 if (oss_period_size / sd < 4096)
729 sd = 1;
730 } else
731 sd = runtime->oss.subdivision;
732 oss_period_size /= sd;
733 if (oss_period_size < 16)
734 oss_period_size = 16;
735 }
736
737 min_period_size = snd_pcm_plug_client_size(substream,
738 snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL));
739 if (min_period_size > 0) {
740 min_period_size *= oss_frame_size;
741 min_period_size = roundup_pow_of_two(min_period_size);
742 if (oss_period_size < min_period_size)
743 oss_period_size = min_period_size;
744 }
745
746 max_period_size = snd_pcm_plug_client_size(substream,
747 snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL));
748 if (max_period_size > 0) {
749 max_period_size *= oss_frame_size;
750 max_period_size = rounddown_pow_of_two(max_period_size);
751 if (oss_period_size > max_period_size)
752 oss_period_size = max_period_size;
753 }
754
755 oss_periods = oss_buffer_size / oss_period_size;
756
757 if (substream->oss.setup.periods > 1)
758 oss_periods = substream->oss.setup.periods;
759
760 s = snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL);
761 if (s > 0 && runtime->oss.maxfrags && s > runtime->oss.maxfrags)
762 s = runtime->oss.maxfrags;
763 if (oss_periods > s)
764 oss_periods = s;
765
766 s = snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL);
767 if (s < 2)
768 s = 2;
769 if (oss_periods < s)
770 oss_periods = s;
771
772 while (oss_period_size * oss_periods > oss_buffer_size)
773 oss_period_size /= 2;
774
775 if (oss_period_size < 16)
776 return -EINVAL;
777 runtime->oss.period_bytes = oss_period_size;
778 runtime->oss.period_frames = 1;
779 runtime->oss.periods = oss_periods;
780 return 0;
781 }
782
choose_rate(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,unsigned int best_rate)783 static int choose_rate(struct snd_pcm_substream *substream,
784 struct snd_pcm_hw_params *params, unsigned int best_rate)
785 {
786 const struct snd_interval *it;
787 struct snd_pcm_hw_params *save;
788 unsigned int rate, prev;
789
790 save = kmalloc(sizeof(*save), GFP_KERNEL);
791 if (save == NULL)
792 return -ENOMEM;
793 *save = *params;
794 it = hw_param_interval_c(save, SNDRV_PCM_HW_PARAM_RATE);
795
796 /* try multiples of the best rate */
797 rate = best_rate;
798 for (;;) {
799 if (it->max < rate || (it->max == rate && it->openmax))
800 break;
801 if (it->min < rate || (it->min == rate && !it->openmin)) {
802 int ret;
803 ret = snd_pcm_hw_param_set(substream, params,
804 SNDRV_PCM_HW_PARAM_RATE,
805 rate, 0);
806 if (ret == (int)rate) {
807 kfree(save);
808 return rate;
809 }
810 *params = *save;
811 }
812 prev = rate;
813 rate += best_rate;
814 if (rate <= prev)
815 break;
816 }
817
818 /* not found, use the nearest rate */
819 kfree(save);
820 return snd_pcm_hw_param_near(substream, params, SNDRV_PCM_HW_PARAM_RATE, best_rate, NULL);
821 }
822
823 /* parameter locking: returns immediately if tried during streaming */
lock_params(struct snd_pcm_runtime * runtime)824 static int lock_params(struct snd_pcm_runtime *runtime)
825 {
826 if (mutex_lock_interruptible(&runtime->oss.params_lock))
827 return -ERESTARTSYS;
828 if (atomic_read(&runtime->oss.rw_ref)) {
829 mutex_unlock(&runtime->oss.params_lock);
830 return -EBUSY;
831 }
832 return 0;
833 }
834
unlock_params(struct snd_pcm_runtime * runtime)835 static void unlock_params(struct snd_pcm_runtime *runtime)
836 {
837 mutex_unlock(&runtime->oss.params_lock);
838 }
839
840 /* call with params_lock held */
snd_pcm_oss_change_params_locked(struct snd_pcm_substream * substream)841 static int snd_pcm_oss_change_params_locked(struct snd_pcm_substream *substream)
842 {
843 struct snd_pcm_runtime *runtime = substream->runtime;
844 struct snd_pcm_hw_params *params, *sparams;
845 struct snd_pcm_sw_params *sw_params;
846 ssize_t oss_buffer_size, oss_period_size;
847 size_t oss_frame_size;
848 int err;
849 int direct;
850 snd_pcm_format_t format, sformat;
851 int n;
852 const struct snd_mask *sformat_mask;
853 struct snd_mask mask;
854
855 if (!runtime->oss.params)
856 return 0;
857 sw_params = kzalloc(sizeof(*sw_params), GFP_KERNEL);
858 params = kmalloc(sizeof(*params), GFP_KERNEL);
859 sparams = kmalloc(sizeof(*sparams), GFP_KERNEL);
860 if (!sw_params || !params || !sparams) {
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
888 err = choose_rate(substream, sparams, runtime->oss.rate);
889 if (err < 0)
890 goto failure;
891 err = snd_pcm_hw_param_near(substream, sparams,
892 SNDRV_PCM_HW_PARAM_CHANNELS,
893 runtime->oss.channels, NULL);
894 if (err < 0)
895 goto failure;
896
897 format = snd_pcm_oss_format_from(runtime->oss.format);
898
899 sformat_mask = hw_param_mask_c(sparams, SNDRV_PCM_HW_PARAM_FORMAT);
900 if (direct)
901 sformat = format;
902 else
903 sformat = snd_pcm_plug_slave_format(format, sformat_mask);
904
905 if ((__force int)sformat < 0 ||
906 !snd_mask_test_format(sformat_mask, sformat)) {
907 pcm_for_each_format(sformat) {
908 if (snd_mask_test_format(sformat_mask, sformat) &&
909 snd_pcm_oss_format_to(sformat) >= 0)
910 goto format_found;
911 }
912 pcm_dbg(substream->pcm, "Cannot find a format!!!\n");
913 err = -EINVAL;
914 goto failure;
915 }
916 format_found:
917 err = _snd_pcm_hw_param_set(sparams, SNDRV_PCM_HW_PARAM_FORMAT, (__force int)sformat, 0);
918 if (err < 0)
919 goto failure;
920
921 if (direct) {
922 memcpy(params, sparams, sizeof(*params));
923 } else {
924 _snd_pcm_hw_params_any(params);
925 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_ACCESS,
926 (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED, 0);
927 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_FORMAT,
928 (__force int)snd_pcm_oss_format_from(runtime->oss.format), 0);
929 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_CHANNELS,
930 runtime->oss.channels, 0);
931 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_RATE,
932 runtime->oss.rate, 0);
933 pdprintf("client: access = %i, format = %i, channels = %i, rate = %i\n",
934 params_access(params), params_format(params),
935 params_channels(params), params_rate(params));
936 }
937 pdprintf("slave: access = %i, format = %i, channels = %i, rate = %i\n",
938 params_access(sparams), params_format(sparams),
939 params_channels(sparams), params_rate(sparams));
940
941 oss_frame_size = snd_pcm_format_physical_width(params_format(params)) *
942 params_channels(params) / 8;
943
944 err = snd_pcm_oss_period_size(substream, params, sparams);
945 if (err < 0)
946 goto failure;
947
948 n = snd_pcm_plug_slave_size(substream, runtime->oss.period_bytes / oss_frame_size);
949 err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, n, NULL);
950 if (err < 0)
951 goto failure;
952
953 err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIODS,
954 runtime->oss.periods, NULL);
955 if (err < 0)
956 goto failure;
957
958 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
959
960 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_HW_PARAMS, sparams);
961 if (err < 0) {
962 pcm_dbg(substream->pcm, "HW_PARAMS failed: %i\n", err);
963 goto failure;
964 }
965
966 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
967 snd_pcm_oss_plugin_clear(substream);
968 if (!direct) {
969 /* add necessary plugins */
970 snd_pcm_oss_plugin_clear(substream);
971 err = snd_pcm_plug_format_plugins(substream, params, sparams);
972 if (err < 0) {
973 pcm_dbg(substream->pcm,
974 "snd_pcm_plug_format_plugins failed: %i\n", err);
975 snd_pcm_oss_plugin_clear(substream);
976 goto failure;
977 }
978 if (runtime->oss.plugin_first) {
979 struct snd_pcm_plugin *plugin;
980 err = snd_pcm_plugin_build_io(substream, sparams, &plugin);
981 if (err < 0) {
982 pcm_dbg(substream->pcm,
983 "snd_pcm_plugin_build_io failed: %i\n", err);
984 snd_pcm_oss_plugin_clear(substream);
985 goto failure;
986 }
987 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
988 err = snd_pcm_plugin_append(plugin);
989 } else {
990 err = snd_pcm_plugin_insert(plugin);
991 }
992 if (err < 0) {
993 snd_pcm_oss_plugin_clear(substream);
994 goto failure;
995 }
996 }
997 }
998 #endif
999
1000 if (runtime->oss.trigger) {
1001 sw_params->start_threshold = 1;
1002 } else {
1003 sw_params->start_threshold = runtime->boundary;
1004 }
1005 if (atomic_read(&substream->mmap_count) ||
1006 substream->stream == SNDRV_PCM_STREAM_CAPTURE)
1007 sw_params->stop_threshold = runtime->boundary;
1008 else
1009 sw_params->stop_threshold = runtime->buffer_size;
1010 sw_params->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
1011 sw_params->period_step = 1;
1012 sw_params->avail_min = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
1013 1 : runtime->period_size;
1014 if (atomic_read(&substream->mmap_count) ||
1015 substream->oss.setup.nosilence) {
1016 sw_params->silence_threshold = 0;
1017 sw_params->silence_size = 0;
1018 } else {
1019 snd_pcm_uframes_t frames;
1020 frames = runtime->period_size + 16;
1021 if (frames > runtime->buffer_size)
1022 frames = runtime->buffer_size;
1023 sw_params->silence_threshold = frames;
1024 sw_params->silence_size = frames;
1025 }
1026
1027 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_SW_PARAMS, sw_params);
1028 if (err < 0) {
1029 pcm_dbg(substream->pcm, "SW_PARAMS failed: %i\n", err);
1030 goto failure;
1031 }
1032
1033 runtime->oss.periods = params_periods(sparams);
1034 oss_period_size = snd_pcm_plug_client_size(substream, params_period_size(sparams));
1035 if (oss_period_size < 0) {
1036 err = -EINVAL;
1037 goto failure;
1038 }
1039 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1040 if (runtime->oss.plugin_first) {
1041 err = snd_pcm_plug_alloc(substream, oss_period_size);
1042 if (err < 0)
1043 goto failure;
1044 }
1045 #endif
1046 oss_period_size *= oss_frame_size;
1047
1048 oss_buffer_size = oss_period_size * runtime->oss.periods;
1049 if (oss_buffer_size < 0) {
1050 err = -EINVAL;
1051 goto failure;
1052 }
1053
1054 runtime->oss.period_bytes = oss_period_size;
1055 runtime->oss.buffer_bytes = oss_buffer_size;
1056
1057 pdprintf("oss: period bytes = %i, buffer bytes = %i\n",
1058 runtime->oss.period_bytes,
1059 runtime->oss.buffer_bytes);
1060 pdprintf("slave: period_size = %i, buffer_size = %i\n",
1061 params_period_size(sparams),
1062 params_buffer_size(sparams));
1063
1064 runtime->oss.format = snd_pcm_oss_format_to(params_format(params));
1065 runtime->oss.channels = params_channels(params);
1066 runtime->oss.rate = params_rate(params);
1067
1068 kvfree(runtime->oss.buffer);
1069 runtime->oss.buffer = kvzalloc(runtime->oss.period_bytes, GFP_KERNEL);
1070 if (!runtime->oss.buffer) {
1071 err = -ENOMEM;
1072 goto failure;
1073 }
1074
1075 runtime->oss.params = 0;
1076 runtime->oss.prepare = 1;
1077 runtime->oss.buffer_used = 0;
1078 if (runtime->dma_area)
1079 snd_pcm_format_set_silence(runtime->format, runtime->dma_area, bytes_to_samples(runtime, runtime->dma_bytes));
1080
1081 runtime->oss.period_frames = snd_pcm_alsa_frames(substream, oss_period_size);
1082
1083 err = 0;
1084 failure:
1085 kfree(sw_params);
1086 kfree(params);
1087 kfree(sparams);
1088 return err;
1089 }
1090
1091 /* this one takes the lock by itself */
snd_pcm_oss_change_params(struct snd_pcm_substream * substream,bool trylock)1092 static int snd_pcm_oss_change_params(struct snd_pcm_substream *substream,
1093 bool trylock)
1094 {
1095 struct snd_pcm_runtime *runtime = substream->runtime;
1096 int err;
1097
1098 if (trylock) {
1099 if (!(mutex_trylock(&runtime->oss.params_lock)))
1100 return -EAGAIN;
1101 } else if (mutex_lock_interruptible(&runtime->oss.params_lock))
1102 return -ERESTARTSYS;
1103
1104 err = snd_pcm_oss_change_params_locked(substream);
1105 mutex_unlock(&runtime->oss.params_lock);
1106 return err;
1107 }
1108
snd_pcm_oss_get_active_substream(struct snd_pcm_oss_file * pcm_oss_file,struct snd_pcm_substream ** r_substream)1109 static int snd_pcm_oss_get_active_substream(struct snd_pcm_oss_file *pcm_oss_file, struct snd_pcm_substream **r_substream)
1110 {
1111 int idx, err;
1112 struct snd_pcm_substream *asubstream = NULL, *substream;
1113
1114 for (idx = 0; idx < 2; idx++) {
1115 substream = pcm_oss_file->streams[idx];
1116 if (substream == NULL)
1117 continue;
1118 if (asubstream == NULL)
1119 asubstream = substream;
1120 if (substream->runtime->oss.params) {
1121 err = snd_pcm_oss_change_params(substream, false);
1122 if (err < 0)
1123 return err;
1124 }
1125 }
1126 if (!asubstream)
1127 return -EIO;
1128 if (r_substream)
1129 *r_substream = asubstream;
1130 return 0;
1131 }
1132
1133 /* call with params_lock held */
1134 /* NOTE: this always call PREPARE unconditionally no matter whether
1135 * runtime->oss.prepare is set or not
1136 */
snd_pcm_oss_prepare(struct snd_pcm_substream * substream)1137 static int snd_pcm_oss_prepare(struct snd_pcm_substream *substream)
1138 {
1139 int err;
1140 struct snd_pcm_runtime *runtime = substream->runtime;
1141
1142 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PREPARE, NULL);
1143 if (err < 0) {
1144 pcm_dbg(substream->pcm,
1145 "snd_pcm_oss_prepare: SNDRV_PCM_IOCTL_PREPARE failed\n");
1146 return err;
1147 }
1148 runtime->oss.prepare = 0;
1149 runtime->oss.prev_hw_ptr_period = 0;
1150 runtime->oss.period_ptr = 0;
1151 runtime->oss.buffer_used = 0;
1152
1153 return 0;
1154 }
1155
snd_pcm_oss_make_ready(struct snd_pcm_substream * substream)1156 static int snd_pcm_oss_make_ready(struct snd_pcm_substream *substream)
1157 {
1158 struct snd_pcm_runtime *runtime;
1159 int err;
1160
1161 runtime = substream->runtime;
1162 if (runtime->oss.params) {
1163 err = snd_pcm_oss_change_params(substream, false);
1164 if (err < 0)
1165 return err;
1166 }
1167 if (runtime->oss.prepare) {
1168 if (mutex_lock_interruptible(&runtime->oss.params_lock))
1169 return -ERESTARTSYS;
1170 err = snd_pcm_oss_prepare(substream);
1171 mutex_unlock(&runtime->oss.params_lock);
1172 if (err < 0)
1173 return err;
1174 }
1175 return 0;
1176 }
1177
1178 /* call with params_lock held */
snd_pcm_oss_make_ready_locked(struct snd_pcm_substream * substream)1179 static int snd_pcm_oss_make_ready_locked(struct snd_pcm_substream *substream)
1180 {
1181 struct snd_pcm_runtime *runtime;
1182 int err;
1183
1184 runtime = substream->runtime;
1185 if (runtime->oss.params) {
1186 err = snd_pcm_oss_change_params_locked(substream);
1187 if (err < 0)
1188 return err;
1189 }
1190 if (runtime->oss.prepare) {
1191 err = snd_pcm_oss_prepare(substream);
1192 if (err < 0)
1193 return err;
1194 }
1195 return 0;
1196 }
1197
snd_pcm_oss_capture_position_fixup(struct snd_pcm_substream * substream,snd_pcm_sframes_t * delay)1198 static int snd_pcm_oss_capture_position_fixup(struct snd_pcm_substream *substream, snd_pcm_sframes_t *delay)
1199 {
1200 struct snd_pcm_runtime *runtime;
1201 snd_pcm_uframes_t frames;
1202 int err = 0;
1203
1204 while (1) {
1205 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, delay);
1206 if (err < 0)
1207 break;
1208 runtime = substream->runtime;
1209 if (*delay <= (snd_pcm_sframes_t)runtime->buffer_size)
1210 break;
1211 /* in case of overrun, skip whole periods like OSS/Linux driver does */
1212 /* until avail(delay) <= buffer_size */
1213 frames = (*delay - runtime->buffer_size) + runtime->period_size - 1;
1214 frames /= runtime->period_size;
1215 frames *= runtime->period_size;
1216 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_FORWARD, &frames);
1217 if (err < 0)
1218 break;
1219 }
1220 return err;
1221 }
1222
snd_pcm_oss_write3(struct snd_pcm_substream * substream,const char * ptr,snd_pcm_uframes_t frames,int in_kernel)1223 snd_pcm_sframes_t snd_pcm_oss_write3(struct snd_pcm_substream *substream, const char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1224 {
1225 struct snd_pcm_runtime *runtime = substream->runtime;
1226 int ret;
1227 while (1) {
1228 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1229 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1230 #ifdef OSS_DEBUG
1231 pcm_dbg(substream->pcm,
1232 "pcm_oss: write: recovering from %s\n",
1233 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1234 "XRUN" : "SUSPEND");
1235 #endif
1236 ret = snd_pcm_oss_prepare(substream);
1237 if (ret < 0)
1238 break;
1239 }
1240 mutex_unlock(&runtime->oss.params_lock);
1241 ret = __snd_pcm_lib_xfer(substream, (void *)ptr, true,
1242 frames, in_kernel);
1243 mutex_lock(&runtime->oss.params_lock);
1244 if (ret != -EPIPE && ret != -ESTRPIPE)
1245 break;
1246 /* test, if we can't store new data, because the stream */
1247 /* has not been started */
1248 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED)
1249 return -EAGAIN;
1250 }
1251 return ret;
1252 }
1253
snd_pcm_oss_read3(struct snd_pcm_substream * substream,char * ptr,snd_pcm_uframes_t frames,int in_kernel)1254 snd_pcm_sframes_t snd_pcm_oss_read3(struct snd_pcm_substream *substream, char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1255 {
1256 struct snd_pcm_runtime *runtime = substream->runtime;
1257 snd_pcm_sframes_t delay;
1258 int ret;
1259 while (1) {
1260 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1261 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1262 #ifdef OSS_DEBUG
1263 pcm_dbg(substream->pcm,
1264 "pcm_oss: read: recovering from %s\n",
1265 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1266 "XRUN" : "SUSPEND");
1267 #endif
1268 ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1269 if (ret < 0)
1270 break;
1271 } else if (runtime->status->state == SNDRV_PCM_STATE_SETUP) {
1272 ret = snd_pcm_oss_prepare(substream);
1273 if (ret < 0)
1274 break;
1275 }
1276 ret = snd_pcm_oss_capture_position_fixup(substream, &delay);
1277 if (ret < 0)
1278 break;
1279 mutex_unlock(&runtime->oss.params_lock);
1280 ret = __snd_pcm_lib_xfer(substream, (void *)ptr, true,
1281 frames, in_kernel);
1282 mutex_lock(&runtime->oss.params_lock);
1283 if (ret == -EPIPE) {
1284 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1285 ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1286 if (ret < 0)
1287 break;
1288 }
1289 continue;
1290 }
1291 if (ret != -ESTRPIPE)
1292 break;
1293 }
1294 return ret;
1295 }
1296
1297 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
snd_pcm_oss_writev3(struct snd_pcm_substream * substream,void ** bufs,snd_pcm_uframes_t frames)1298 snd_pcm_sframes_t snd_pcm_oss_writev3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames)
1299 {
1300 struct snd_pcm_runtime *runtime = substream->runtime;
1301 int ret;
1302 while (1) {
1303 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1304 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1305 #ifdef OSS_DEBUG
1306 pcm_dbg(substream->pcm,
1307 "pcm_oss: writev: recovering from %s\n",
1308 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1309 "XRUN" : "SUSPEND");
1310 #endif
1311 ret = snd_pcm_oss_prepare(substream);
1312 if (ret < 0)
1313 break;
1314 }
1315 ret = snd_pcm_kernel_writev(substream, bufs, frames);
1316 if (ret != -EPIPE && ret != -ESTRPIPE)
1317 break;
1318
1319 /* test, if we can't store new data, because the stream */
1320 /* has not been started */
1321 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED)
1322 return -EAGAIN;
1323 }
1324 return ret;
1325 }
1326
snd_pcm_oss_readv3(struct snd_pcm_substream * substream,void ** bufs,snd_pcm_uframes_t frames)1327 snd_pcm_sframes_t snd_pcm_oss_readv3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames)
1328 {
1329 struct snd_pcm_runtime *runtime = substream->runtime;
1330 int ret;
1331 while (1) {
1332 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1333 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1334 #ifdef OSS_DEBUG
1335 pcm_dbg(substream->pcm,
1336 "pcm_oss: readv: recovering from %s\n",
1337 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1338 "XRUN" : "SUSPEND");
1339 #endif
1340 ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1341 if (ret < 0)
1342 break;
1343 } else if (runtime->status->state == SNDRV_PCM_STATE_SETUP) {
1344 ret = snd_pcm_oss_prepare(substream);
1345 if (ret < 0)
1346 break;
1347 }
1348 ret = snd_pcm_kernel_readv(substream, bufs, frames);
1349 if (ret != -EPIPE && ret != -ESTRPIPE)
1350 break;
1351 }
1352 return ret;
1353 }
1354 #endif /* CONFIG_SND_PCM_OSS_PLUGINS */
1355
snd_pcm_oss_write2(struct snd_pcm_substream * substream,const char * buf,size_t bytes,int in_kernel)1356 static ssize_t snd_pcm_oss_write2(struct snd_pcm_substream *substream, const char *buf, size_t bytes, int in_kernel)
1357 {
1358 struct snd_pcm_runtime *runtime = substream->runtime;
1359 snd_pcm_sframes_t frames, frames1;
1360 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1361 if (runtime->oss.plugin_first) {
1362 struct snd_pcm_plugin_channel *channels;
1363 size_t oss_frame_bytes = (runtime->oss.plugin_first->src_width * runtime->oss.plugin_first->src_format.channels) / 8;
1364 if (!in_kernel) {
1365 if (copy_from_user(runtime->oss.buffer, (const char __force __user *)buf, bytes))
1366 return -EFAULT;
1367 buf = runtime->oss.buffer;
1368 }
1369 frames = bytes / oss_frame_bytes;
1370 frames1 = snd_pcm_plug_client_channels_buf(substream, (char *)buf, frames, &channels);
1371 if (frames1 < 0)
1372 return frames1;
1373 frames1 = snd_pcm_plug_write_transfer(substream, channels, frames1);
1374 if (frames1 <= 0)
1375 return frames1;
1376 bytes = frames1 * oss_frame_bytes;
1377 } else
1378 #endif
1379 {
1380 frames = bytes_to_frames(runtime, bytes);
1381 frames1 = snd_pcm_oss_write3(substream, buf, frames, in_kernel);
1382 if (frames1 <= 0)
1383 return frames1;
1384 bytes = frames_to_bytes(runtime, frames1);
1385 }
1386 return bytes;
1387 }
1388
snd_pcm_oss_write1(struct snd_pcm_substream * substream,const char __user * buf,size_t bytes)1389 static ssize_t snd_pcm_oss_write1(struct snd_pcm_substream *substream, const char __user *buf, size_t bytes)
1390 {
1391 size_t xfer = 0;
1392 ssize_t tmp = 0;
1393 struct snd_pcm_runtime *runtime = substream->runtime;
1394
1395 if (atomic_read(&substream->mmap_count))
1396 return -ENXIO;
1397
1398 atomic_inc(&runtime->oss.rw_ref);
1399 while (bytes > 0) {
1400 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1401 tmp = -ERESTARTSYS;
1402 break;
1403 }
1404 tmp = snd_pcm_oss_make_ready_locked(substream);
1405 if (tmp < 0)
1406 goto err;
1407 if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1408 tmp = bytes;
1409 if (tmp + runtime->oss.buffer_used > runtime->oss.period_bytes)
1410 tmp = runtime->oss.period_bytes - runtime->oss.buffer_used;
1411 if (tmp > 0) {
1412 if (copy_from_user(runtime->oss.buffer + runtime->oss.buffer_used, buf, tmp)) {
1413 tmp = -EFAULT;
1414 goto err;
1415 }
1416 }
1417 runtime->oss.buffer_used += tmp;
1418 buf += tmp;
1419 bytes -= tmp;
1420 xfer += tmp;
1421 if (substream->oss.setup.partialfrag ||
1422 runtime->oss.buffer_used == runtime->oss.period_bytes) {
1423 tmp = snd_pcm_oss_write2(substream, runtime->oss.buffer + runtime->oss.period_ptr,
1424 runtime->oss.buffer_used - runtime->oss.period_ptr, 1);
1425 if (tmp <= 0)
1426 goto err;
1427 runtime->oss.bytes += tmp;
1428 runtime->oss.period_ptr += tmp;
1429 runtime->oss.period_ptr %= runtime->oss.period_bytes;
1430 if (runtime->oss.period_ptr == 0 ||
1431 runtime->oss.period_ptr == runtime->oss.buffer_used)
1432 runtime->oss.buffer_used = 0;
1433 else if ((substream->f_flags & O_NONBLOCK) != 0) {
1434 tmp = -EAGAIN;
1435 goto err;
1436 }
1437 }
1438 } else {
1439 tmp = snd_pcm_oss_write2(substream,
1440 (const char __force *)buf,
1441 runtime->oss.period_bytes, 0);
1442 if (tmp <= 0)
1443 goto err;
1444 runtime->oss.bytes += tmp;
1445 buf += tmp;
1446 bytes -= tmp;
1447 xfer += tmp;
1448 if ((substream->f_flags & O_NONBLOCK) != 0 &&
1449 tmp != runtime->oss.period_bytes)
1450 tmp = -EAGAIN;
1451 }
1452 err:
1453 mutex_unlock(&runtime->oss.params_lock);
1454 if (tmp < 0)
1455 break;
1456 if (signal_pending(current)) {
1457 tmp = -ERESTARTSYS;
1458 break;
1459 }
1460 tmp = 0;
1461 }
1462 atomic_dec(&runtime->oss.rw_ref);
1463 return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1464 }
1465
snd_pcm_oss_read2(struct snd_pcm_substream * substream,char * buf,size_t bytes,int in_kernel)1466 static ssize_t snd_pcm_oss_read2(struct snd_pcm_substream *substream, char *buf, size_t bytes, int in_kernel)
1467 {
1468 struct snd_pcm_runtime *runtime = substream->runtime;
1469 snd_pcm_sframes_t frames, frames1;
1470 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1471 char __user *final_dst = (char __force __user *)buf;
1472 if (runtime->oss.plugin_first) {
1473 struct snd_pcm_plugin_channel *channels;
1474 size_t oss_frame_bytes = (runtime->oss.plugin_last->dst_width * runtime->oss.plugin_last->dst_format.channels) / 8;
1475 if (!in_kernel)
1476 buf = runtime->oss.buffer;
1477 frames = bytes / oss_frame_bytes;
1478 frames1 = snd_pcm_plug_client_channels_buf(substream, buf, frames, &channels);
1479 if (frames1 < 0)
1480 return frames1;
1481 frames1 = snd_pcm_plug_read_transfer(substream, channels, frames1);
1482 if (frames1 <= 0)
1483 return frames1;
1484 bytes = frames1 * oss_frame_bytes;
1485 if (!in_kernel && copy_to_user(final_dst, buf, bytes))
1486 return -EFAULT;
1487 } else
1488 #endif
1489 {
1490 frames = bytes_to_frames(runtime, bytes);
1491 frames1 = snd_pcm_oss_read3(substream, buf, frames, in_kernel);
1492 if (frames1 <= 0)
1493 return frames1;
1494 bytes = frames_to_bytes(runtime, frames1);
1495 }
1496 return bytes;
1497 }
1498
snd_pcm_oss_read1(struct snd_pcm_substream * substream,char __user * buf,size_t bytes)1499 static ssize_t snd_pcm_oss_read1(struct snd_pcm_substream *substream, char __user *buf, size_t bytes)
1500 {
1501 size_t xfer = 0;
1502 ssize_t tmp = 0;
1503 struct snd_pcm_runtime *runtime = substream->runtime;
1504
1505 if (atomic_read(&substream->mmap_count))
1506 return -ENXIO;
1507
1508 atomic_inc(&runtime->oss.rw_ref);
1509 while (bytes > 0) {
1510 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1511 tmp = -ERESTARTSYS;
1512 break;
1513 }
1514 tmp = snd_pcm_oss_make_ready_locked(substream);
1515 if (tmp < 0)
1516 goto err;
1517 if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1518 if (runtime->oss.buffer_used == 0) {
1519 tmp = snd_pcm_oss_read2(substream, runtime->oss.buffer, runtime->oss.period_bytes, 1);
1520 if (tmp <= 0)
1521 goto err;
1522 runtime->oss.bytes += tmp;
1523 runtime->oss.period_ptr = tmp;
1524 runtime->oss.buffer_used = tmp;
1525 }
1526 tmp = bytes;
1527 if ((size_t) tmp > runtime->oss.buffer_used)
1528 tmp = runtime->oss.buffer_used;
1529 if (copy_to_user(buf, runtime->oss.buffer + (runtime->oss.period_ptr - runtime->oss.buffer_used), tmp)) {
1530 tmp = -EFAULT;
1531 goto err;
1532 }
1533 buf += tmp;
1534 bytes -= tmp;
1535 xfer += tmp;
1536 runtime->oss.buffer_used -= tmp;
1537 } else {
1538 tmp = snd_pcm_oss_read2(substream, (char __force *)buf,
1539 runtime->oss.period_bytes, 0);
1540 if (tmp <= 0)
1541 goto err;
1542 runtime->oss.bytes += tmp;
1543 buf += tmp;
1544 bytes -= tmp;
1545 xfer += tmp;
1546 }
1547 err:
1548 mutex_unlock(&runtime->oss.params_lock);
1549 if (tmp < 0)
1550 break;
1551 if (signal_pending(current)) {
1552 tmp = -ERESTARTSYS;
1553 break;
1554 }
1555 tmp = 0;
1556 }
1557 atomic_dec(&runtime->oss.rw_ref);
1558 return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1559 }
1560
snd_pcm_oss_reset(struct snd_pcm_oss_file * pcm_oss_file)1561 static int snd_pcm_oss_reset(struct snd_pcm_oss_file *pcm_oss_file)
1562 {
1563 struct snd_pcm_substream *substream;
1564 struct snd_pcm_runtime *runtime;
1565 int i;
1566
1567 for (i = 0; i < 2; i++) {
1568 substream = pcm_oss_file->streams[i];
1569 if (!substream)
1570 continue;
1571 runtime = substream->runtime;
1572 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1573 mutex_lock(&runtime->oss.params_lock);
1574 runtime->oss.prepare = 1;
1575 runtime->oss.buffer_used = 0;
1576 runtime->oss.prev_hw_ptr_period = 0;
1577 runtime->oss.period_ptr = 0;
1578 mutex_unlock(&runtime->oss.params_lock);
1579 }
1580 return 0;
1581 }
1582
snd_pcm_oss_post(struct snd_pcm_oss_file * pcm_oss_file)1583 static int snd_pcm_oss_post(struct snd_pcm_oss_file *pcm_oss_file)
1584 {
1585 struct snd_pcm_substream *substream;
1586 int err;
1587
1588 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1589 if (substream != NULL) {
1590 err = snd_pcm_oss_make_ready(substream);
1591 if (err < 0)
1592 return err;
1593 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_START, NULL);
1594 }
1595 /* note: all errors from the start action are ignored */
1596 /* OSS apps do not know, how to handle them */
1597 return 0;
1598 }
1599
snd_pcm_oss_sync1(struct snd_pcm_substream * substream,size_t size)1600 static int snd_pcm_oss_sync1(struct snd_pcm_substream *substream, size_t size)
1601 {
1602 struct snd_pcm_runtime *runtime;
1603 ssize_t result = 0;
1604 snd_pcm_state_t state;
1605 long res;
1606 wait_queue_entry_t wait;
1607
1608 runtime = substream->runtime;
1609 init_waitqueue_entry(&wait, current);
1610 add_wait_queue(&runtime->sleep, &wait);
1611 #ifdef OSS_DEBUG
1612 pcm_dbg(substream->pcm, "sync1: size = %li\n", size);
1613 #endif
1614 while (1) {
1615 result = snd_pcm_oss_write2(substream, runtime->oss.buffer, size, 1);
1616 if (result > 0) {
1617 runtime->oss.buffer_used = 0;
1618 result = 0;
1619 break;
1620 }
1621 if (result != 0 && result != -EAGAIN)
1622 break;
1623 result = 0;
1624 set_current_state(TASK_INTERRUPTIBLE);
1625 snd_pcm_stream_lock_irq(substream);
1626 state = runtime->status->state;
1627 snd_pcm_stream_unlock_irq(substream);
1628 if (state != SNDRV_PCM_STATE_RUNNING) {
1629 set_current_state(TASK_RUNNING);
1630 break;
1631 }
1632 res = schedule_timeout(10 * HZ);
1633 if (signal_pending(current)) {
1634 result = -ERESTARTSYS;
1635 break;
1636 }
1637 if (res == 0) {
1638 pcm_err(substream->pcm,
1639 "OSS sync error - DMA timeout\n");
1640 result = -EIO;
1641 break;
1642 }
1643 }
1644 remove_wait_queue(&runtime->sleep, &wait);
1645 return result;
1646 }
1647
snd_pcm_oss_sync(struct snd_pcm_oss_file * pcm_oss_file)1648 static int snd_pcm_oss_sync(struct snd_pcm_oss_file *pcm_oss_file)
1649 {
1650 int err = 0;
1651 unsigned int saved_f_flags;
1652 struct snd_pcm_substream *substream;
1653 struct snd_pcm_runtime *runtime;
1654 snd_pcm_format_t format;
1655 unsigned long width;
1656 size_t size;
1657
1658 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1659 if (substream != NULL) {
1660 runtime = substream->runtime;
1661 if (atomic_read(&substream->mmap_count))
1662 goto __direct;
1663 err = snd_pcm_oss_make_ready(substream);
1664 if (err < 0)
1665 return err;
1666 atomic_inc(&runtime->oss.rw_ref);
1667 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1668 atomic_dec(&runtime->oss.rw_ref);
1669 return -ERESTARTSYS;
1670 }
1671 format = snd_pcm_oss_format_from(runtime->oss.format);
1672 width = snd_pcm_format_physical_width(format);
1673 if (runtime->oss.buffer_used > 0) {
1674 #ifdef OSS_DEBUG
1675 pcm_dbg(substream->pcm, "sync: buffer_used\n");
1676 #endif
1677 size = (8 * (runtime->oss.period_bytes - runtime->oss.buffer_used) + 7) / width;
1678 snd_pcm_format_set_silence(format,
1679 runtime->oss.buffer + runtime->oss.buffer_used,
1680 size);
1681 err = snd_pcm_oss_sync1(substream, runtime->oss.period_bytes);
1682 if (err < 0)
1683 goto unlock;
1684 } else if (runtime->oss.period_ptr > 0) {
1685 #ifdef OSS_DEBUG
1686 pcm_dbg(substream->pcm, "sync: period_ptr\n");
1687 #endif
1688 size = runtime->oss.period_bytes - runtime->oss.period_ptr;
1689 snd_pcm_format_set_silence(format,
1690 runtime->oss.buffer,
1691 size * 8 / width);
1692 err = snd_pcm_oss_sync1(substream, size);
1693 if (err < 0)
1694 goto unlock;
1695 }
1696 /*
1697 * The ALSA's period might be a bit large than OSS one.
1698 * Fill the remain portion of ALSA period with zeros.
1699 */
1700 size = runtime->control->appl_ptr % runtime->period_size;
1701 if (size > 0) {
1702 size = runtime->period_size - size;
1703 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED)
1704 snd_pcm_lib_write(substream, NULL, size);
1705 else if (runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
1706 snd_pcm_lib_writev(substream, NULL, size);
1707 }
1708 unlock:
1709 mutex_unlock(&runtime->oss.params_lock);
1710 atomic_dec(&runtime->oss.rw_ref);
1711 if (err < 0)
1712 return err;
1713 /*
1714 * finish sync: drain the buffer
1715 */
1716 __direct:
1717 saved_f_flags = substream->f_flags;
1718 substream->f_flags &= ~O_NONBLOCK;
1719 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1720 substream->f_flags = saved_f_flags;
1721 if (err < 0)
1722 return err;
1723 mutex_lock(&runtime->oss.params_lock);
1724 runtime->oss.prepare = 1;
1725 mutex_unlock(&runtime->oss.params_lock);
1726 }
1727
1728 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
1729 if (substream != NULL) {
1730 err = snd_pcm_oss_make_ready(substream);
1731 if (err < 0)
1732 return err;
1733 runtime = substream->runtime;
1734 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1735 if (err < 0)
1736 return err;
1737 mutex_lock(&runtime->oss.params_lock);
1738 runtime->oss.buffer_used = 0;
1739 runtime->oss.prepare = 1;
1740 mutex_unlock(&runtime->oss.params_lock);
1741 }
1742 return 0;
1743 }
1744
snd_pcm_oss_set_rate(struct snd_pcm_oss_file * pcm_oss_file,int rate)1745 static int snd_pcm_oss_set_rate(struct snd_pcm_oss_file *pcm_oss_file, int rate)
1746 {
1747 int idx;
1748
1749 for (idx = 1; idx >= 0; --idx) {
1750 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1751 struct snd_pcm_runtime *runtime;
1752 int err;
1753
1754 if (substream == NULL)
1755 continue;
1756 runtime = substream->runtime;
1757 if (rate < 1000)
1758 rate = 1000;
1759 else if (rate > 192000)
1760 rate = 192000;
1761 err = lock_params(runtime);
1762 if (err < 0)
1763 return err;
1764 if (runtime->oss.rate != rate) {
1765 runtime->oss.params = 1;
1766 runtime->oss.rate = rate;
1767 }
1768 unlock_params(runtime);
1769 }
1770 return snd_pcm_oss_get_rate(pcm_oss_file);
1771 }
1772
snd_pcm_oss_get_rate(struct snd_pcm_oss_file * pcm_oss_file)1773 static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file)
1774 {
1775 struct snd_pcm_substream *substream;
1776 int err;
1777
1778 err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream);
1779 if (err < 0)
1780 return err;
1781 return substream->runtime->oss.rate;
1782 }
1783
snd_pcm_oss_set_channels(struct snd_pcm_oss_file * pcm_oss_file,unsigned int channels)1784 static int snd_pcm_oss_set_channels(struct snd_pcm_oss_file *pcm_oss_file, unsigned int channels)
1785 {
1786 int idx;
1787 if (channels < 1)
1788 channels = 1;
1789 if (channels > 128)
1790 return -EINVAL;
1791 for (idx = 1; idx >= 0; --idx) {
1792 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1793 struct snd_pcm_runtime *runtime;
1794 int err;
1795
1796 if (substream == NULL)
1797 continue;
1798 runtime = substream->runtime;
1799 err = lock_params(runtime);
1800 if (err < 0)
1801 return err;
1802 if (runtime->oss.channels != channels) {
1803 runtime->oss.params = 1;
1804 runtime->oss.channels = channels;
1805 }
1806 unlock_params(runtime);
1807 }
1808 return snd_pcm_oss_get_channels(pcm_oss_file);
1809 }
1810
snd_pcm_oss_get_channels(struct snd_pcm_oss_file * pcm_oss_file)1811 static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file)
1812 {
1813 struct snd_pcm_substream *substream;
1814 int err;
1815
1816 err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream);
1817 if (err < 0)
1818 return err;
1819 return substream->runtime->oss.channels;
1820 }
1821
snd_pcm_oss_get_block_size(struct snd_pcm_oss_file * pcm_oss_file)1822 static int snd_pcm_oss_get_block_size(struct snd_pcm_oss_file *pcm_oss_file)
1823 {
1824 struct snd_pcm_substream *substream;
1825 int err;
1826
1827 err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream);
1828 if (err < 0)
1829 return err;
1830 return substream->runtime->oss.period_bytes;
1831 }
1832
snd_pcm_oss_get_formats(struct snd_pcm_oss_file * pcm_oss_file)1833 static int snd_pcm_oss_get_formats(struct snd_pcm_oss_file *pcm_oss_file)
1834 {
1835 struct snd_pcm_substream *substream;
1836 int err;
1837 int direct;
1838 struct snd_pcm_hw_params *params;
1839 unsigned int formats = 0;
1840 const struct snd_mask *format_mask;
1841 int fmt;
1842
1843 err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream);
1844 if (err < 0)
1845 return err;
1846 if (atomic_read(&substream->mmap_count))
1847 direct = 1;
1848 else
1849 direct = substream->oss.setup.direct;
1850 if (!direct)
1851 return AFMT_MU_LAW | AFMT_U8 |
1852 AFMT_S16_LE | AFMT_S16_BE |
1853 AFMT_S8 | AFMT_U16_LE |
1854 AFMT_U16_BE |
1855 AFMT_S32_LE | AFMT_S32_BE |
1856 AFMT_S24_LE | AFMT_S24_BE |
1857 AFMT_S24_PACKED;
1858 params = kmalloc(sizeof(*params), GFP_KERNEL);
1859 if (!params)
1860 return -ENOMEM;
1861 _snd_pcm_hw_params_any(params);
1862 err = snd_pcm_hw_refine(substream, params);
1863 if (err < 0)
1864 goto error;
1865 format_mask = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
1866 for (fmt = 0; fmt < 32; ++fmt) {
1867 if (snd_mask_test(format_mask, fmt)) {
1868 int f = snd_pcm_oss_format_to((__force snd_pcm_format_t)fmt);
1869 if (f >= 0)
1870 formats |= f;
1871 }
1872 }
1873
1874 error:
1875 kfree(params);
1876 return err < 0 ? err : formats;
1877 }
1878
snd_pcm_oss_set_format(struct snd_pcm_oss_file * pcm_oss_file,int format)1879 static int snd_pcm_oss_set_format(struct snd_pcm_oss_file *pcm_oss_file, int format)
1880 {
1881 int formats, idx;
1882 int err;
1883
1884 if (format != AFMT_QUERY) {
1885 formats = snd_pcm_oss_get_formats(pcm_oss_file);
1886 if (formats < 0)
1887 return formats;
1888 if (!(formats & format))
1889 format = AFMT_U8;
1890 for (idx = 1; idx >= 0; --idx) {
1891 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1892 struct snd_pcm_runtime *runtime;
1893 if (substream == NULL)
1894 continue;
1895 runtime = substream->runtime;
1896 err = lock_params(runtime);
1897 if (err < 0)
1898 return err;
1899 if (runtime->oss.format != format) {
1900 runtime->oss.params = 1;
1901 runtime->oss.format = format;
1902 }
1903 unlock_params(runtime);
1904 }
1905 }
1906 return snd_pcm_oss_get_format(pcm_oss_file);
1907 }
1908
snd_pcm_oss_get_format(struct snd_pcm_oss_file * pcm_oss_file)1909 static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file)
1910 {
1911 struct snd_pcm_substream *substream;
1912 int err;
1913
1914 err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream);
1915 if (err < 0)
1916 return err;
1917 return substream->runtime->oss.format;
1918 }
1919
snd_pcm_oss_set_subdivide1(struct snd_pcm_substream * substream,int subdivide)1920 static int snd_pcm_oss_set_subdivide1(struct snd_pcm_substream *substream, int subdivide)
1921 {
1922 struct snd_pcm_runtime *runtime;
1923
1924 runtime = substream->runtime;
1925 if (subdivide == 0) {
1926 subdivide = runtime->oss.subdivision;
1927 if (subdivide == 0)
1928 subdivide = 1;
1929 return subdivide;
1930 }
1931 if (runtime->oss.subdivision || runtime->oss.fragshift)
1932 return -EINVAL;
1933 if (subdivide != 1 && subdivide != 2 && subdivide != 4 &&
1934 subdivide != 8 && subdivide != 16)
1935 return -EINVAL;
1936 runtime->oss.subdivision = subdivide;
1937 runtime->oss.params = 1;
1938 return subdivide;
1939 }
1940
snd_pcm_oss_set_subdivide(struct snd_pcm_oss_file * pcm_oss_file,int subdivide)1941 static int snd_pcm_oss_set_subdivide(struct snd_pcm_oss_file *pcm_oss_file, int subdivide)
1942 {
1943 int err = -EINVAL, idx;
1944
1945 for (idx = 1; idx >= 0; --idx) {
1946 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1947 struct snd_pcm_runtime *runtime;
1948
1949 if (substream == NULL)
1950 continue;
1951 runtime = substream->runtime;
1952 err = lock_params(runtime);
1953 if (err < 0)
1954 return err;
1955 err = snd_pcm_oss_set_subdivide1(substream, subdivide);
1956 unlock_params(runtime);
1957 if (err < 0)
1958 return err;
1959 }
1960 return err;
1961 }
1962
snd_pcm_oss_set_fragment1(struct snd_pcm_substream * substream,unsigned int val)1963 static int snd_pcm_oss_set_fragment1(struct snd_pcm_substream *substream, unsigned int val)
1964 {
1965 struct snd_pcm_runtime *runtime;
1966 int fragshift;
1967
1968 runtime = substream->runtime;
1969 if (runtime->oss.subdivision || runtime->oss.fragshift)
1970 return -EINVAL;
1971 fragshift = val & 0xffff;
1972 if (fragshift >= 25) /* should be large enough */
1973 return -EINVAL;
1974 runtime->oss.fragshift = fragshift;
1975 runtime->oss.maxfrags = (val >> 16) & 0xffff;
1976 if (runtime->oss.fragshift < 4) /* < 16 */
1977 runtime->oss.fragshift = 4;
1978 if (runtime->oss.maxfrags < 2)
1979 runtime->oss.maxfrags = 2;
1980 runtime->oss.params = 1;
1981 return 0;
1982 }
1983
snd_pcm_oss_set_fragment(struct snd_pcm_oss_file * pcm_oss_file,unsigned int val)1984 static int snd_pcm_oss_set_fragment(struct snd_pcm_oss_file *pcm_oss_file, unsigned int val)
1985 {
1986 int err = -EINVAL, idx;
1987
1988 for (idx = 1; idx >= 0; --idx) {
1989 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1990 struct snd_pcm_runtime *runtime;
1991
1992 if (substream == NULL)
1993 continue;
1994 runtime = substream->runtime;
1995 err = lock_params(runtime);
1996 if (err < 0)
1997 return err;
1998 err = snd_pcm_oss_set_fragment1(substream, val);
1999 unlock_params(runtime);
2000 if (err < 0)
2001 return err;
2002 }
2003 return err;
2004 }
2005
snd_pcm_oss_nonblock(struct file * file)2006 static int snd_pcm_oss_nonblock(struct file * file)
2007 {
2008 spin_lock(&file->f_lock);
2009 file->f_flags |= O_NONBLOCK;
2010 spin_unlock(&file->f_lock);
2011 return 0;
2012 }
2013
snd_pcm_oss_get_caps1(struct snd_pcm_substream * substream,int res)2014 static int snd_pcm_oss_get_caps1(struct snd_pcm_substream *substream, int res)
2015 {
2016
2017 if (substream == NULL) {
2018 res &= ~DSP_CAP_DUPLEX;
2019 return res;
2020 }
2021 #ifdef DSP_CAP_MULTI
2022 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2023 if (substream->pstr->substream_count > 1)
2024 res |= DSP_CAP_MULTI;
2025 #endif
2026 /* DSP_CAP_REALTIME is set all times: */
2027 /* all ALSA drivers can return actual pointer in ring buffer */
2028 #if defined(DSP_CAP_REALTIME) && 0
2029 {
2030 struct snd_pcm_runtime *runtime = substream->runtime;
2031 if (runtime->info & (SNDRV_PCM_INFO_BLOCK_TRANSFER|SNDRV_PCM_INFO_BATCH))
2032 res &= ~DSP_CAP_REALTIME;
2033 }
2034 #endif
2035 return res;
2036 }
2037
snd_pcm_oss_get_caps(struct snd_pcm_oss_file * pcm_oss_file)2038 static int snd_pcm_oss_get_caps(struct snd_pcm_oss_file *pcm_oss_file)
2039 {
2040 int result, idx;
2041
2042 result = DSP_CAP_TRIGGER | DSP_CAP_MMAP | DSP_CAP_DUPLEX | DSP_CAP_REALTIME;
2043 for (idx = 0; idx < 2; idx++) {
2044 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
2045 result = snd_pcm_oss_get_caps1(substream, result);
2046 }
2047 result |= 0x0001; /* revision - same as SB AWE 64 */
2048 return result;
2049 }
2050
snd_pcm_oss_simulate_fill(struct snd_pcm_substream * substream,snd_pcm_uframes_t hw_ptr)2051 static void snd_pcm_oss_simulate_fill(struct snd_pcm_substream *substream,
2052 snd_pcm_uframes_t hw_ptr)
2053 {
2054 struct snd_pcm_runtime *runtime = substream->runtime;
2055 snd_pcm_uframes_t appl_ptr;
2056 appl_ptr = hw_ptr + runtime->buffer_size;
2057 appl_ptr %= runtime->boundary;
2058 runtime->control->appl_ptr = appl_ptr;
2059 }
2060
snd_pcm_oss_set_trigger(struct snd_pcm_oss_file * pcm_oss_file,int trigger)2061 static int snd_pcm_oss_set_trigger(struct snd_pcm_oss_file *pcm_oss_file, int trigger)
2062 {
2063 struct snd_pcm_runtime *runtime;
2064 struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2065 int err, cmd;
2066
2067 #ifdef OSS_DEBUG
2068 pcm_dbg(substream->pcm, "pcm_oss: trigger = 0x%x\n", trigger);
2069 #endif
2070
2071 psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2072 csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2073
2074 if (psubstream) {
2075 err = snd_pcm_oss_make_ready(psubstream);
2076 if (err < 0)
2077 return err;
2078 }
2079 if (csubstream) {
2080 err = snd_pcm_oss_make_ready(csubstream);
2081 if (err < 0)
2082 return err;
2083 }
2084 if (psubstream) {
2085 runtime = psubstream->runtime;
2086 cmd = 0;
2087 if (mutex_lock_interruptible(&runtime->oss.params_lock))
2088 return -ERESTARTSYS;
2089 if (trigger & PCM_ENABLE_OUTPUT) {
2090 if (runtime->oss.trigger)
2091 goto _skip1;
2092 if (atomic_read(&psubstream->mmap_count))
2093 snd_pcm_oss_simulate_fill(psubstream,
2094 get_hw_ptr_period(runtime));
2095 runtime->oss.trigger = 1;
2096 runtime->start_threshold = 1;
2097 cmd = SNDRV_PCM_IOCTL_START;
2098 } else {
2099 if (!runtime->oss.trigger)
2100 goto _skip1;
2101 runtime->oss.trigger = 0;
2102 runtime->start_threshold = runtime->boundary;
2103 cmd = SNDRV_PCM_IOCTL_DROP;
2104 runtime->oss.prepare = 1;
2105 }
2106 _skip1:
2107 mutex_unlock(&runtime->oss.params_lock);
2108 if (cmd) {
2109 err = snd_pcm_kernel_ioctl(psubstream, cmd, NULL);
2110 if (err < 0)
2111 return err;
2112 }
2113 }
2114 if (csubstream) {
2115 runtime = csubstream->runtime;
2116 cmd = 0;
2117 if (mutex_lock_interruptible(&runtime->oss.params_lock))
2118 return -ERESTARTSYS;
2119 if (trigger & PCM_ENABLE_INPUT) {
2120 if (runtime->oss.trigger)
2121 goto _skip2;
2122 runtime->oss.trigger = 1;
2123 runtime->start_threshold = 1;
2124 cmd = SNDRV_PCM_IOCTL_START;
2125 } else {
2126 if (!runtime->oss.trigger)
2127 goto _skip2;
2128 runtime->oss.trigger = 0;
2129 runtime->start_threshold = runtime->boundary;
2130 cmd = SNDRV_PCM_IOCTL_DROP;
2131 runtime->oss.prepare = 1;
2132 }
2133 _skip2:
2134 mutex_unlock(&runtime->oss.params_lock);
2135 if (cmd) {
2136 err = snd_pcm_kernel_ioctl(csubstream, cmd, NULL);
2137 if (err < 0)
2138 return err;
2139 }
2140 }
2141 return 0;
2142 }
2143
snd_pcm_oss_get_trigger(struct snd_pcm_oss_file * pcm_oss_file)2144 static int snd_pcm_oss_get_trigger(struct snd_pcm_oss_file *pcm_oss_file)
2145 {
2146 struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2147 int result = 0;
2148
2149 psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2150 csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2151 if (psubstream && psubstream->runtime && psubstream->runtime->oss.trigger)
2152 result |= PCM_ENABLE_OUTPUT;
2153 if (csubstream && csubstream->runtime && csubstream->runtime->oss.trigger)
2154 result |= PCM_ENABLE_INPUT;
2155 return result;
2156 }
2157
snd_pcm_oss_get_odelay(struct snd_pcm_oss_file * pcm_oss_file)2158 static int snd_pcm_oss_get_odelay(struct snd_pcm_oss_file *pcm_oss_file)
2159 {
2160 struct snd_pcm_substream *substream;
2161 struct snd_pcm_runtime *runtime;
2162 snd_pcm_sframes_t delay;
2163 int err;
2164
2165 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2166 if (substream == NULL)
2167 return -EINVAL;
2168 err = snd_pcm_oss_make_ready(substream);
2169 if (err < 0)
2170 return err;
2171 runtime = substream->runtime;
2172 if (runtime->oss.params || runtime->oss.prepare)
2173 return 0;
2174 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
2175 if (err == -EPIPE)
2176 delay = 0; /* hack for broken OSS applications */
2177 else if (err < 0)
2178 return err;
2179 return snd_pcm_oss_bytes(substream, delay);
2180 }
2181
snd_pcm_oss_get_ptr(struct snd_pcm_oss_file * pcm_oss_file,int stream,struct count_info __user * _info)2182 static int snd_pcm_oss_get_ptr(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct count_info __user * _info)
2183 {
2184 struct snd_pcm_substream *substream;
2185 struct snd_pcm_runtime *runtime;
2186 snd_pcm_sframes_t delay;
2187 int fixup;
2188 struct count_info info;
2189 int err;
2190
2191 if (_info == NULL)
2192 return -EFAULT;
2193 substream = pcm_oss_file->streams[stream];
2194 if (substream == NULL)
2195 return -EINVAL;
2196 err = snd_pcm_oss_make_ready(substream);
2197 if (err < 0)
2198 return err;
2199 runtime = substream->runtime;
2200 if (runtime->oss.params || runtime->oss.prepare) {
2201 memset(&info, 0, sizeof(info));
2202 if (copy_to_user(_info, &info, sizeof(info)))
2203 return -EFAULT;
2204 return 0;
2205 }
2206 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2207 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
2208 if (err == -EPIPE || err == -ESTRPIPE || (! err && delay < 0)) {
2209 err = 0;
2210 delay = 0;
2211 fixup = 0;
2212 } else {
2213 fixup = runtime->oss.buffer_used;
2214 }
2215 } else {
2216 err = snd_pcm_oss_capture_position_fixup(substream, &delay);
2217 fixup = -runtime->oss.buffer_used;
2218 }
2219 if (err < 0)
2220 return err;
2221 info.ptr = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr % runtime->buffer_size);
2222 if (atomic_read(&substream->mmap_count)) {
2223 snd_pcm_sframes_t n;
2224 delay = get_hw_ptr_period(runtime);
2225 n = delay - runtime->oss.prev_hw_ptr_period;
2226 if (n < 0)
2227 n += runtime->boundary;
2228 info.blocks = n / runtime->period_size;
2229 runtime->oss.prev_hw_ptr_period = delay;
2230 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2231 snd_pcm_oss_simulate_fill(substream, delay);
2232 info.bytes = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr) & INT_MAX;
2233 } else {
2234 delay = snd_pcm_oss_bytes(substream, delay);
2235 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2236 if (substream->oss.setup.buggyptr)
2237 info.blocks = (runtime->oss.buffer_bytes - delay - fixup) / runtime->oss.period_bytes;
2238 else
2239 info.blocks = (delay + fixup) / runtime->oss.period_bytes;
2240 info.bytes = (runtime->oss.bytes - delay) & INT_MAX;
2241 } else {
2242 delay += fixup;
2243 info.blocks = delay / runtime->oss.period_bytes;
2244 info.bytes = (runtime->oss.bytes + delay) & INT_MAX;
2245 }
2246 }
2247 if (copy_to_user(_info, &info, sizeof(info)))
2248 return -EFAULT;
2249 return 0;
2250 }
2251
snd_pcm_oss_get_space(struct snd_pcm_oss_file * pcm_oss_file,int stream,struct audio_buf_info __user * _info)2252 static int snd_pcm_oss_get_space(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct audio_buf_info __user *_info)
2253 {
2254 struct snd_pcm_substream *substream;
2255 struct snd_pcm_runtime *runtime;
2256 snd_pcm_sframes_t avail;
2257 int fixup;
2258 struct audio_buf_info info;
2259 int err;
2260
2261 if (_info == NULL)
2262 return -EFAULT;
2263 substream = pcm_oss_file->streams[stream];
2264 if (substream == NULL)
2265 return -EINVAL;
2266 runtime = substream->runtime;
2267
2268 if (runtime->oss.params) {
2269 err = snd_pcm_oss_change_params(substream, false);
2270 if (err < 0)
2271 return err;
2272 }
2273
2274 info.fragsize = runtime->oss.period_bytes;
2275 info.fragstotal = runtime->periods;
2276 if (runtime->oss.prepare) {
2277 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2278 info.bytes = runtime->oss.period_bytes * runtime->oss.periods;
2279 info.fragments = runtime->oss.periods;
2280 } else {
2281 info.bytes = 0;
2282 info.fragments = 0;
2283 }
2284 } else {
2285 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2286 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &avail);
2287 if (err == -EPIPE || err == -ESTRPIPE || (! err && avail < 0)) {
2288 avail = runtime->buffer_size;
2289 err = 0;
2290 fixup = 0;
2291 } else {
2292 avail = runtime->buffer_size - avail;
2293 fixup = -runtime->oss.buffer_used;
2294 }
2295 } else {
2296 err = snd_pcm_oss_capture_position_fixup(substream, &avail);
2297 fixup = runtime->oss.buffer_used;
2298 }
2299 if (err < 0)
2300 return err;
2301 info.bytes = snd_pcm_oss_bytes(substream, avail) + fixup;
2302 info.fragments = info.bytes / runtime->oss.period_bytes;
2303 }
2304
2305 #ifdef OSS_DEBUG
2306 pcm_dbg(substream->pcm,
2307 "pcm_oss: space: bytes = %i, fragments = %i, fragstotal = %i, fragsize = %i\n",
2308 info.bytes, info.fragments, info.fragstotal, info.fragsize);
2309 #endif
2310 if (copy_to_user(_info, &info, sizeof(info)))
2311 return -EFAULT;
2312 return 0;
2313 }
2314
snd_pcm_oss_get_mapbuf(struct snd_pcm_oss_file * pcm_oss_file,int stream,struct buffmem_desc __user * _info)2315 static int snd_pcm_oss_get_mapbuf(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct buffmem_desc __user * _info)
2316 {
2317 // it won't be probably implemented
2318 // pr_debug("TODO: snd_pcm_oss_get_mapbuf\n");
2319 return -EINVAL;
2320 }
2321
strip_task_path(const char * path)2322 static const char *strip_task_path(const char *path)
2323 {
2324 const char *ptr, *ptrl = NULL;
2325 for (ptr = path; *ptr; ptr++) {
2326 if (*ptr == '/')
2327 ptrl = ptr + 1;
2328 }
2329 return ptrl;
2330 }
2331
snd_pcm_oss_look_for_setup(struct snd_pcm * pcm,int stream,const char * task_name,struct snd_pcm_oss_setup * rsetup)2332 static void snd_pcm_oss_look_for_setup(struct snd_pcm *pcm, int stream,
2333 const char *task_name,
2334 struct snd_pcm_oss_setup *rsetup)
2335 {
2336 struct snd_pcm_oss_setup *setup;
2337
2338 mutex_lock(&pcm->streams[stream].oss.setup_mutex);
2339 do {
2340 for (setup = pcm->streams[stream].oss.setup_list; setup;
2341 setup = setup->next) {
2342 if (!strcmp(setup->task_name, task_name))
2343 goto out;
2344 }
2345 } while ((task_name = strip_task_path(task_name)) != NULL);
2346 out:
2347 if (setup)
2348 *rsetup = *setup;
2349 mutex_unlock(&pcm->streams[stream].oss.setup_mutex);
2350 }
2351
snd_pcm_oss_release_substream(struct snd_pcm_substream * substream)2352 static void snd_pcm_oss_release_substream(struct snd_pcm_substream *substream)
2353 {
2354 struct snd_pcm_runtime *runtime;
2355 runtime = substream->runtime;
2356 kvfree(runtime->oss.buffer);
2357 runtime->oss.buffer = NULL;
2358 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
2359 snd_pcm_oss_plugin_clear(substream);
2360 #endif
2361 substream->oss.oss = 0;
2362 }
2363
snd_pcm_oss_init_substream(struct snd_pcm_substream * substream,struct snd_pcm_oss_setup * setup,int minor)2364 static void snd_pcm_oss_init_substream(struct snd_pcm_substream *substream,
2365 struct snd_pcm_oss_setup *setup,
2366 int minor)
2367 {
2368 struct snd_pcm_runtime *runtime;
2369
2370 substream->oss.oss = 1;
2371 substream->oss.setup = *setup;
2372 if (setup->nonblock)
2373 substream->f_flags |= O_NONBLOCK;
2374 else if (setup->block)
2375 substream->f_flags &= ~O_NONBLOCK;
2376 runtime = substream->runtime;
2377 runtime->oss.params = 1;
2378 runtime->oss.trigger = 1;
2379 runtime->oss.rate = 8000;
2380 mutex_init(&runtime->oss.params_lock);
2381 switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
2382 case SNDRV_MINOR_OSS_PCM_8:
2383 runtime->oss.format = AFMT_U8;
2384 break;
2385 case SNDRV_MINOR_OSS_PCM_16:
2386 runtime->oss.format = AFMT_S16_LE;
2387 break;
2388 default:
2389 runtime->oss.format = AFMT_MU_LAW;
2390 }
2391 runtime->oss.channels = 1;
2392 runtime->oss.fragshift = 0;
2393 runtime->oss.maxfrags = 0;
2394 runtime->oss.subdivision = 0;
2395 substream->pcm_release = snd_pcm_oss_release_substream;
2396 atomic_set(&runtime->oss.rw_ref, 0);
2397 }
2398
snd_pcm_oss_release_file(struct snd_pcm_oss_file * pcm_oss_file)2399 static int snd_pcm_oss_release_file(struct snd_pcm_oss_file *pcm_oss_file)
2400 {
2401 int cidx;
2402 if (!pcm_oss_file)
2403 return 0;
2404 for (cidx = 0; cidx < 2; ++cidx) {
2405 struct snd_pcm_substream *substream = pcm_oss_file->streams[cidx];
2406 if (substream)
2407 snd_pcm_release_substream(substream);
2408 }
2409 kfree(pcm_oss_file);
2410 return 0;
2411 }
2412
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)2413 static int snd_pcm_oss_open_file(struct file *file,
2414 struct snd_pcm *pcm,
2415 struct snd_pcm_oss_file **rpcm_oss_file,
2416 int minor,
2417 struct snd_pcm_oss_setup *setup)
2418 {
2419 int idx, err;
2420 struct snd_pcm_oss_file *pcm_oss_file;
2421 struct snd_pcm_substream *substream;
2422 fmode_t f_mode = file->f_mode;
2423
2424 if (rpcm_oss_file)
2425 *rpcm_oss_file = NULL;
2426
2427 pcm_oss_file = kzalloc(sizeof(*pcm_oss_file), GFP_KERNEL);
2428 if (pcm_oss_file == NULL)
2429 return -ENOMEM;
2430
2431 if ((f_mode & (FMODE_WRITE|FMODE_READ)) == (FMODE_WRITE|FMODE_READ) &&
2432 (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX))
2433 f_mode = FMODE_WRITE;
2434
2435 file->f_flags &= ~O_APPEND;
2436 for (idx = 0; idx < 2; idx++) {
2437 if (setup[idx].disable)
2438 continue;
2439 if (! pcm->streams[idx].substream_count)
2440 continue; /* no matching substream */
2441 if (idx == SNDRV_PCM_STREAM_PLAYBACK) {
2442 if (! (f_mode & FMODE_WRITE))
2443 continue;
2444 } else {
2445 if (! (f_mode & FMODE_READ))
2446 continue;
2447 }
2448 err = snd_pcm_open_substream(pcm, idx, file, &substream);
2449 if (err < 0) {
2450 snd_pcm_oss_release_file(pcm_oss_file);
2451 return err;
2452 }
2453
2454 pcm_oss_file->streams[idx] = substream;
2455 snd_pcm_oss_init_substream(substream, &setup[idx], minor);
2456 }
2457
2458 if (!pcm_oss_file->streams[0] && !pcm_oss_file->streams[1]) {
2459 snd_pcm_oss_release_file(pcm_oss_file);
2460 return -EINVAL;
2461 }
2462
2463 file->private_data = pcm_oss_file;
2464 if (rpcm_oss_file)
2465 *rpcm_oss_file = pcm_oss_file;
2466 return 0;
2467 }
2468
2469
snd_task_name(struct task_struct * task,char * name,size_t size)2470 static int snd_task_name(struct task_struct *task, char *name, size_t size)
2471 {
2472 unsigned int idx;
2473
2474 if (snd_BUG_ON(!task || !name || size < 2))
2475 return -EINVAL;
2476 for (idx = 0; idx < sizeof(task->comm) && idx + 1 < size; idx++)
2477 name[idx] = task->comm[idx];
2478 name[idx] = '\0';
2479 return 0;
2480 }
2481
snd_pcm_oss_open(struct inode * inode,struct file * file)2482 static int snd_pcm_oss_open(struct inode *inode, struct file *file)
2483 {
2484 int err;
2485 char task_name[32];
2486 struct snd_pcm *pcm;
2487 struct snd_pcm_oss_file *pcm_oss_file;
2488 struct snd_pcm_oss_setup setup[2];
2489 int nonblock;
2490 wait_queue_entry_t wait;
2491
2492 err = nonseekable_open(inode, file);
2493 if (err < 0)
2494 return err;
2495
2496 pcm = snd_lookup_oss_minor_data(iminor(inode),
2497 SNDRV_OSS_DEVICE_TYPE_PCM);
2498 if (pcm == NULL) {
2499 err = -ENODEV;
2500 goto __error1;
2501 }
2502 err = snd_card_file_add(pcm->card, file);
2503 if (err < 0)
2504 goto __error1;
2505 if (!try_module_get(pcm->card->module)) {
2506 err = -EFAULT;
2507 goto __error2;
2508 }
2509 if (snd_task_name(current, task_name, sizeof(task_name)) < 0) {
2510 err = -EFAULT;
2511 goto __error;
2512 }
2513 memset(setup, 0, sizeof(setup));
2514 if (file->f_mode & FMODE_WRITE)
2515 snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_PLAYBACK,
2516 task_name, &setup[0]);
2517 if (file->f_mode & FMODE_READ)
2518 snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_CAPTURE,
2519 task_name, &setup[1]);
2520
2521 nonblock = !!(file->f_flags & O_NONBLOCK);
2522 if (!nonblock)
2523 nonblock = nonblock_open;
2524
2525 init_waitqueue_entry(&wait, current);
2526 add_wait_queue(&pcm->open_wait, &wait);
2527 mutex_lock(&pcm->open_mutex);
2528 while (1) {
2529 err = snd_pcm_oss_open_file(file, pcm, &pcm_oss_file,
2530 iminor(inode), setup);
2531 if (err >= 0)
2532 break;
2533 if (err == -EAGAIN) {
2534 if (nonblock) {
2535 err = -EBUSY;
2536 break;
2537 }
2538 } else
2539 break;
2540 set_current_state(TASK_INTERRUPTIBLE);
2541 mutex_unlock(&pcm->open_mutex);
2542 schedule();
2543 mutex_lock(&pcm->open_mutex);
2544 if (pcm->card->shutdown) {
2545 err = -ENODEV;
2546 break;
2547 }
2548 if (signal_pending(current)) {
2549 err = -ERESTARTSYS;
2550 break;
2551 }
2552 }
2553 remove_wait_queue(&pcm->open_wait, &wait);
2554 mutex_unlock(&pcm->open_mutex);
2555 if (err < 0)
2556 goto __error;
2557 snd_card_unref(pcm->card);
2558 return err;
2559
2560 __error:
2561 module_put(pcm->card->module);
2562 __error2:
2563 snd_card_file_remove(pcm->card, file);
2564 __error1:
2565 if (pcm)
2566 snd_card_unref(pcm->card);
2567 return err;
2568 }
2569
snd_pcm_oss_release(struct inode * inode,struct file * file)2570 static int snd_pcm_oss_release(struct inode *inode, struct file *file)
2571 {
2572 struct snd_pcm *pcm;
2573 struct snd_pcm_substream *substream;
2574 struct snd_pcm_oss_file *pcm_oss_file;
2575
2576 pcm_oss_file = file->private_data;
2577 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2578 if (substream == NULL)
2579 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2580 if (snd_BUG_ON(!substream))
2581 return -ENXIO;
2582 pcm = substream->pcm;
2583 if (!pcm->card->shutdown)
2584 snd_pcm_oss_sync(pcm_oss_file);
2585 mutex_lock(&pcm->open_mutex);
2586 snd_pcm_oss_release_file(pcm_oss_file);
2587 mutex_unlock(&pcm->open_mutex);
2588 wake_up(&pcm->open_wait);
2589 module_put(pcm->card->module);
2590 snd_card_file_remove(pcm->card, file);
2591 return 0;
2592 }
2593
snd_pcm_oss_ioctl(struct file * file,unsigned int cmd,unsigned long arg)2594 static long snd_pcm_oss_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2595 {
2596 struct snd_pcm_oss_file *pcm_oss_file;
2597 int __user *p = (int __user *)arg;
2598 int res;
2599
2600 pcm_oss_file = file->private_data;
2601 if (cmd == OSS_GETVERSION)
2602 return put_user(SNDRV_OSS_VERSION, p);
2603 if (cmd == OSS_ALSAEMULVER)
2604 return put_user(1, p);
2605 #if IS_REACHABLE(CONFIG_SND_MIXER_OSS)
2606 if (((cmd >> 8) & 0xff) == 'M') { /* mixer ioctl - for OSS compatibility */
2607 struct snd_pcm_substream *substream;
2608 int idx;
2609 for (idx = 0; idx < 2; ++idx) {
2610 substream = pcm_oss_file->streams[idx];
2611 if (substream != NULL)
2612 break;
2613 }
2614 if (snd_BUG_ON(idx >= 2))
2615 return -ENXIO;
2616 return snd_mixer_oss_ioctl_card(substream->pcm->card, cmd, arg);
2617 }
2618 #endif
2619 if (((cmd >> 8) & 0xff) != 'P')
2620 return -EINVAL;
2621 #ifdef OSS_DEBUG
2622 pr_debug("pcm_oss: ioctl = 0x%x\n", cmd);
2623 #endif
2624 switch (cmd) {
2625 case SNDCTL_DSP_RESET:
2626 return snd_pcm_oss_reset(pcm_oss_file);
2627 case SNDCTL_DSP_SYNC:
2628 return snd_pcm_oss_sync(pcm_oss_file);
2629 case SNDCTL_DSP_SPEED:
2630 if (get_user(res, p))
2631 return -EFAULT;
2632 res = snd_pcm_oss_set_rate(pcm_oss_file, res);
2633 if (res < 0)
2634 return res;
2635 return put_user(res, p);
2636 case SOUND_PCM_READ_RATE:
2637 res = snd_pcm_oss_get_rate(pcm_oss_file);
2638 if (res < 0)
2639 return res;
2640 return put_user(res, p);
2641 case SNDCTL_DSP_STEREO:
2642 if (get_user(res, p))
2643 return -EFAULT;
2644 res = res > 0 ? 2 : 1;
2645 res = snd_pcm_oss_set_channels(pcm_oss_file, res);
2646 if (res < 0)
2647 return res;
2648 return put_user(--res, p);
2649 case SNDCTL_DSP_GETBLKSIZE:
2650 res = snd_pcm_oss_get_block_size(pcm_oss_file);
2651 if (res < 0)
2652 return res;
2653 return put_user(res, p);
2654 case SNDCTL_DSP_SETFMT:
2655 if (get_user(res, p))
2656 return -EFAULT;
2657 res = snd_pcm_oss_set_format(pcm_oss_file, res);
2658 if (res < 0)
2659 return res;
2660 return put_user(res, p);
2661 case SOUND_PCM_READ_BITS:
2662 res = snd_pcm_oss_get_format(pcm_oss_file);
2663 if (res < 0)
2664 return res;
2665 return put_user(res, p);
2666 case SNDCTL_DSP_CHANNELS:
2667 if (get_user(res, p))
2668 return -EFAULT;
2669 res = snd_pcm_oss_set_channels(pcm_oss_file, res);
2670 if (res < 0)
2671 return res;
2672 return put_user(res, p);
2673 case SOUND_PCM_READ_CHANNELS:
2674 res = snd_pcm_oss_get_channels(pcm_oss_file);
2675 if (res < 0)
2676 return res;
2677 return put_user(res, p);
2678 case SOUND_PCM_WRITE_FILTER:
2679 case SOUND_PCM_READ_FILTER:
2680 return -EIO;
2681 case SNDCTL_DSP_POST:
2682 return snd_pcm_oss_post(pcm_oss_file);
2683 case SNDCTL_DSP_SUBDIVIDE:
2684 if (get_user(res, p))
2685 return -EFAULT;
2686 res = snd_pcm_oss_set_subdivide(pcm_oss_file, res);
2687 if (res < 0)
2688 return res;
2689 return put_user(res, p);
2690 case SNDCTL_DSP_SETFRAGMENT:
2691 if (get_user(res, p))
2692 return -EFAULT;
2693 return snd_pcm_oss_set_fragment(pcm_oss_file, res);
2694 case SNDCTL_DSP_GETFMTS:
2695 res = snd_pcm_oss_get_formats(pcm_oss_file);
2696 if (res < 0)
2697 return res;
2698 return put_user(res, p);
2699 case SNDCTL_DSP_GETOSPACE:
2700 case SNDCTL_DSP_GETISPACE:
2701 return snd_pcm_oss_get_space(pcm_oss_file,
2702 cmd == SNDCTL_DSP_GETISPACE ?
2703 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2704 (struct audio_buf_info __user *) arg);
2705 case SNDCTL_DSP_NONBLOCK:
2706 return snd_pcm_oss_nonblock(file);
2707 case SNDCTL_DSP_GETCAPS:
2708 res = snd_pcm_oss_get_caps(pcm_oss_file);
2709 if (res < 0)
2710 return res;
2711 return put_user(res, p);
2712 case SNDCTL_DSP_GETTRIGGER:
2713 res = snd_pcm_oss_get_trigger(pcm_oss_file);
2714 if (res < 0)
2715 return res;
2716 return put_user(res, p);
2717 case SNDCTL_DSP_SETTRIGGER:
2718 if (get_user(res, p))
2719 return -EFAULT;
2720 return snd_pcm_oss_set_trigger(pcm_oss_file, res);
2721 case SNDCTL_DSP_GETIPTR:
2722 case SNDCTL_DSP_GETOPTR:
2723 return snd_pcm_oss_get_ptr(pcm_oss_file,
2724 cmd == SNDCTL_DSP_GETIPTR ?
2725 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2726 (struct count_info __user *) arg);
2727 case SNDCTL_DSP_MAPINBUF:
2728 case SNDCTL_DSP_MAPOUTBUF:
2729 return snd_pcm_oss_get_mapbuf(pcm_oss_file,
2730 cmd == SNDCTL_DSP_MAPINBUF ?
2731 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2732 (struct buffmem_desc __user *) arg);
2733 case SNDCTL_DSP_SETSYNCRO:
2734 /* stop DMA now.. */
2735 return 0;
2736 case SNDCTL_DSP_SETDUPLEX:
2737 if (snd_pcm_oss_get_caps(pcm_oss_file) & DSP_CAP_DUPLEX)
2738 return 0;
2739 return -EIO;
2740 case SNDCTL_DSP_GETODELAY:
2741 res = snd_pcm_oss_get_odelay(pcm_oss_file);
2742 if (res < 0) {
2743 /* it's for sure, some broken apps don't check for error codes */
2744 put_user(0, p);
2745 return res;
2746 }
2747 return put_user(res, p);
2748 case SNDCTL_DSP_PROFILE:
2749 return 0; /* silently ignore */
2750 default:
2751 pr_debug("pcm_oss: unknown command = 0x%x\n", cmd);
2752 }
2753 return -EINVAL;
2754 }
2755
2756 #ifdef CONFIG_COMPAT
2757 /* all compatible */
snd_pcm_oss_ioctl_compat(struct file * file,unsigned int cmd,unsigned long arg)2758 static long snd_pcm_oss_ioctl_compat(struct file *file, unsigned int cmd,
2759 unsigned long arg)
2760 {
2761 /*
2762 * Everything is compatbile except SNDCTL_DSP_MAPINBUF/SNDCTL_DSP_MAPOUTBUF,
2763 * which are not implemented for the native case either
2764 */
2765 return snd_pcm_oss_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
2766 }
2767 #else
2768 #define snd_pcm_oss_ioctl_compat NULL
2769 #endif
2770
snd_pcm_oss_read(struct file * file,char __user * buf,size_t count,loff_t * offset)2771 static ssize_t snd_pcm_oss_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
2772 {
2773 struct snd_pcm_oss_file *pcm_oss_file;
2774 struct snd_pcm_substream *substream;
2775
2776 pcm_oss_file = file->private_data;
2777 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2778 if (substream == NULL)
2779 return -ENXIO;
2780 substream->f_flags = file->f_flags & O_NONBLOCK;
2781 #ifndef OSS_DEBUG
2782 return snd_pcm_oss_read1(substream, buf, count);
2783 #else
2784 {
2785 ssize_t res = snd_pcm_oss_read1(substream, buf, count);
2786 pcm_dbg(substream->pcm,
2787 "pcm_oss: read %li bytes (returned %li bytes)\n",
2788 (long)count, (long)res);
2789 return res;
2790 }
2791 #endif
2792 }
2793
snd_pcm_oss_write(struct file * file,const char __user * buf,size_t count,loff_t * offset)2794 static ssize_t snd_pcm_oss_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
2795 {
2796 struct snd_pcm_oss_file *pcm_oss_file;
2797 struct snd_pcm_substream *substream;
2798 long result;
2799
2800 pcm_oss_file = file->private_data;
2801 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2802 if (substream == NULL)
2803 return -ENXIO;
2804 substream->f_flags = file->f_flags & O_NONBLOCK;
2805 result = snd_pcm_oss_write1(substream, buf, count);
2806 #ifdef OSS_DEBUG
2807 pcm_dbg(substream->pcm, "pcm_oss: write %li bytes (wrote %li bytes)\n",
2808 (long)count, (long)result);
2809 #endif
2810 return result;
2811 }
2812
snd_pcm_oss_playback_ready(struct snd_pcm_substream * substream)2813 static int snd_pcm_oss_playback_ready(struct snd_pcm_substream *substream)
2814 {
2815 struct snd_pcm_runtime *runtime = substream->runtime;
2816 if (atomic_read(&substream->mmap_count))
2817 return runtime->oss.prev_hw_ptr_period !=
2818 get_hw_ptr_period(runtime);
2819 else
2820 return snd_pcm_playback_avail(runtime) >=
2821 runtime->oss.period_frames;
2822 }
2823
snd_pcm_oss_capture_ready(struct snd_pcm_substream * substream)2824 static int snd_pcm_oss_capture_ready(struct snd_pcm_substream *substream)
2825 {
2826 struct snd_pcm_runtime *runtime = substream->runtime;
2827 if (atomic_read(&substream->mmap_count))
2828 return runtime->oss.prev_hw_ptr_period !=
2829 get_hw_ptr_period(runtime);
2830 else
2831 return snd_pcm_capture_avail(runtime) >=
2832 runtime->oss.period_frames;
2833 }
2834
snd_pcm_oss_poll(struct file * file,poll_table * wait)2835 static __poll_t snd_pcm_oss_poll(struct file *file, poll_table * wait)
2836 {
2837 struct snd_pcm_oss_file *pcm_oss_file;
2838 __poll_t mask;
2839 struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2840
2841 pcm_oss_file = file->private_data;
2842
2843 psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2844 csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2845
2846 mask = 0;
2847 if (psubstream != NULL) {
2848 struct snd_pcm_runtime *runtime = psubstream->runtime;
2849 poll_wait(file, &runtime->sleep, wait);
2850 snd_pcm_stream_lock_irq(psubstream);
2851 if (runtime->status->state != SNDRV_PCM_STATE_DRAINING &&
2852 (runtime->status->state != SNDRV_PCM_STATE_RUNNING ||
2853 snd_pcm_oss_playback_ready(psubstream)))
2854 mask |= EPOLLOUT | EPOLLWRNORM;
2855 snd_pcm_stream_unlock_irq(psubstream);
2856 }
2857 if (csubstream != NULL) {
2858 struct snd_pcm_runtime *runtime = csubstream->runtime;
2859 snd_pcm_state_t ostate;
2860 poll_wait(file, &runtime->sleep, wait);
2861 snd_pcm_stream_lock_irq(csubstream);
2862 ostate = runtime->status->state;
2863 if (ostate != SNDRV_PCM_STATE_RUNNING ||
2864 snd_pcm_oss_capture_ready(csubstream))
2865 mask |= EPOLLIN | EPOLLRDNORM;
2866 snd_pcm_stream_unlock_irq(csubstream);
2867 if (ostate != SNDRV_PCM_STATE_RUNNING && runtime->oss.trigger) {
2868 struct snd_pcm_oss_file ofile;
2869 memset(&ofile, 0, sizeof(ofile));
2870 ofile.streams[SNDRV_PCM_STREAM_CAPTURE] = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2871 runtime->oss.trigger = 0;
2872 snd_pcm_oss_set_trigger(&ofile, PCM_ENABLE_INPUT);
2873 }
2874 }
2875
2876 return mask;
2877 }
2878
snd_pcm_oss_mmap(struct file * file,struct vm_area_struct * area)2879 static int snd_pcm_oss_mmap(struct file *file, struct vm_area_struct *area)
2880 {
2881 struct snd_pcm_oss_file *pcm_oss_file;
2882 struct snd_pcm_substream *substream = NULL;
2883 struct snd_pcm_runtime *runtime;
2884 int err;
2885
2886 #ifdef OSS_DEBUG
2887 pr_debug("pcm_oss: mmap begin\n");
2888 #endif
2889 pcm_oss_file = file->private_data;
2890 switch ((area->vm_flags & (VM_READ | VM_WRITE))) {
2891 case VM_READ | VM_WRITE:
2892 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2893 if (substream)
2894 break;
2895 fallthrough;
2896 case VM_READ:
2897 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2898 break;
2899 case VM_WRITE:
2900 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2901 break;
2902 default:
2903 return -EINVAL;
2904 }
2905 /* set VM_READ access as well to fix memset() routines that do
2906 reads before writes (to improve performance) */
2907 area->vm_flags |= VM_READ;
2908 if (substream == NULL)
2909 return -ENXIO;
2910 runtime = substream->runtime;
2911 if (!(runtime->info & SNDRV_PCM_INFO_MMAP_VALID))
2912 return -EIO;
2913 if (runtime->info & SNDRV_PCM_INFO_INTERLEAVED)
2914 runtime->access = SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2915 else
2916 return -EIO;
2917
2918 if (runtime->oss.params) {
2919 /* use mutex_trylock() for params_lock for avoiding a deadlock
2920 * between mmap_lock and params_lock taken by
2921 * copy_from/to_user() in snd_pcm_oss_write/read()
2922 */
2923 err = snd_pcm_oss_change_params(substream, true);
2924 if (err < 0)
2925 return err;
2926 }
2927 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
2928 if (runtime->oss.plugin_first != NULL)
2929 return -EIO;
2930 #endif
2931
2932 if (area->vm_pgoff != 0)
2933 return -EINVAL;
2934
2935 err = snd_pcm_mmap_data(substream, file, area);
2936 if (err < 0)
2937 return err;
2938 runtime->oss.mmap_bytes = area->vm_end - area->vm_start;
2939 runtime->silence_threshold = 0;
2940 runtime->silence_size = 0;
2941 #ifdef OSS_DEBUG
2942 pr_debug("pcm_oss: mmap ok, bytes = 0x%x\n",
2943 runtime->oss.mmap_bytes);
2944 #endif
2945 /* In mmap mode we never stop */
2946 runtime->stop_threshold = runtime->boundary;
2947
2948 return 0;
2949 }
2950
2951 #ifdef CONFIG_SND_VERBOSE_PROCFS
2952 /*
2953 * /proc interface
2954 */
2955
snd_pcm_oss_proc_read(struct snd_info_entry * entry,struct snd_info_buffer * buffer)2956 static void snd_pcm_oss_proc_read(struct snd_info_entry *entry,
2957 struct snd_info_buffer *buffer)
2958 {
2959 struct snd_pcm_str *pstr = entry->private_data;
2960 struct snd_pcm_oss_setup *setup = pstr->oss.setup_list;
2961 mutex_lock(&pstr->oss.setup_mutex);
2962 while (setup) {
2963 snd_iprintf(buffer, "%s %u %u%s%s%s%s%s%s\n",
2964 setup->task_name,
2965 setup->periods,
2966 setup->period_size,
2967 setup->disable ? " disable" : "",
2968 setup->direct ? " direct" : "",
2969 setup->block ? " block" : "",
2970 setup->nonblock ? " non-block" : "",
2971 setup->partialfrag ? " partial-frag" : "",
2972 setup->nosilence ? " no-silence" : "");
2973 setup = setup->next;
2974 }
2975 mutex_unlock(&pstr->oss.setup_mutex);
2976 }
2977
snd_pcm_oss_proc_free_setup_list(struct snd_pcm_str * pstr)2978 static void snd_pcm_oss_proc_free_setup_list(struct snd_pcm_str * pstr)
2979 {
2980 struct snd_pcm_oss_setup *setup, *setupn;
2981
2982 for (setup = pstr->oss.setup_list, pstr->oss.setup_list = NULL;
2983 setup; setup = setupn) {
2984 setupn = setup->next;
2985 kfree(setup->task_name);
2986 kfree(setup);
2987 }
2988 pstr->oss.setup_list = NULL;
2989 }
2990
snd_pcm_oss_proc_write(struct snd_info_entry * entry,struct snd_info_buffer * buffer)2991 static void snd_pcm_oss_proc_write(struct snd_info_entry *entry,
2992 struct snd_info_buffer *buffer)
2993 {
2994 struct snd_pcm_str *pstr = entry->private_data;
2995 char line[128], str[32], task_name[32];
2996 const char *ptr;
2997 int idx1;
2998 struct snd_pcm_oss_setup *setup, *setup1, template;
2999
3000 while (!snd_info_get_line(buffer, line, sizeof(line))) {
3001 mutex_lock(&pstr->oss.setup_mutex);
3002 memset(&template, 0, sizeof(template));
3003 ptr = snd_info_get_str(task_name, line, sizeof(task_name));
3004 if (!strcmp(task_name, "clear") || !strcmp(task_name, "erase")) {
3005 snd_pcm_oss_proc_free_setup_list(pstr);
3006 mutex_unlock(&pstr->oss.setup_mutex);
3007 continue;
3008 }
3009 for (setup = pstr->oss.setup_list; setup; setup = setup->next) {
3010 if (!strcmp(setup->task_name, task_name)) {
3011 template = *setup;
3012 break;
3013 }
3014 }
3015 ptr = snd_info_get_str(str, ptr, sizeof(str));
3016 template.periods = simple_strtoul(str, NULL, 10);
3017 ptr = snd_info_get_str(str, ptr, sizeof(str));
3018 template.period_size = simple_strtoul(str, NULL, 10);
3019 for (idx1 = 31; idx1 >= 0; idx1--)
3020 if (template.period_size & (1 << idx1))
3021 break;
3022 for (idx1--; idx1 >= 0; idx1--)
3023 template.period_size &= ~(1 << idx1);
3024 do {
3025 ptr = snd_info_get_str(str, ptr, sizeof(str));
3026 if (!strcmp(str, "disable")) {
3027 template.disable = 1;
3028 } else if (!strcmp(str, "direct")) {
3029 template.direct = 1;
3030 } else if (!strcmp(str, "block")) {
3031 template.block = 1;
3032 } else if (!strcmp(str, "non-block")) {
3033 template.nonblock = 1;
3034 } else if (!strcmp(str, "partial-frag")) {
3035 template.partialfrag = 1;
3036 } else if (!strcmp(str, "no-silence")) {
3037 template.nosilence = 1;
3038 } else if (!strcmp(str, "buggy-ptr")) {
3039 template.buggyptr = 1;
3040 }
3041 } while (*str);
3042 if (setup == NULL) {
3043 setup = kmalloc(sizeof(*setup), GFP_KERNEL);
3044 if (! setup) {
3045 buffer->error = -ENOMEM;
3046 mutex_unlock(&pstr->oss.setup_mutex);
3047 return;
3048 }
3049 if (pstr->oss.setup_list == NULL)
3050 pstr->oss.setup_list = setup;
3051 else {
3052 for (setup1 = pstr->oss.setup_list;
3053 setup1->next; setup1 = setup1->next);
3054 setup1->next = setup;
3055 }
3056 template.task_name = kstrdup(task_name, GFP_KERNEL);
3057 if (! template.task_name) {
3058 kfree(setup);
3059 buffer->error = -ENOMEM;
3060 mutex_unlock(&pstr->oss.setup_mutex);
3061 return;
3062 }
3063 }
3064 *setup = template;
3065 mutex_unlock(&pstr->oss.setup_mutex);
3066 }
3067 }
3068
snd_pcm_oss_proc_init(struct snd_pcm * pcm)3069 static void snd_pcm_oss_proc_init(struct snd_pcm *pcm)
3070 {
3071 int stream;
3072 for (stream = 0; stream < 2; ++stream) {
3073 struct snd_info_entry *entry;
3074 struct snd_pcm_str *pstr = &pcm->streams[stream];
3075 if (pstr->substream_count == 0)
3076 continue;
3077 entry = snd_info_create_card_entry(pcm->card, "oss", pstr->proc_root);
3078 if (entry) {
3079 entry->content = SNDRV_INFO_CONTENT_TEXT;
3080 entry->mode = S_IFREG | 0644;
3081 entry->c.text.read = snd_pcm_oss_proc_read;
3082 entry->c.text.write = snd_pcm_oss_proc_write;
3083 entry->private_data = pstr;
3084 if (snd_info_register(entry) < 0) {
3085 snd_info_free_entry(entry);
3086 entry = NULL;
3087 }
3088 }
3089 pstr->oss.proc_entry = entry;
3090 }
3091 }
3092
snd_pcm_oss_proc_done(struct snd_pcm * pcm)3093 static void snd_pcm_oss_proc_done(struct snd_pcm *pcm)
3094 {
3095 int stream;
3096 for (stream = 0; stream < 2; ++stream) {
3097 struct snd_pcm_str *pstr = &pcm->streams[stream];
3098 snd_info_free_entry(pstr->oss.proc_entry);
3099 pstr->oss.proc_entry = NULL;
3100 snd_pcm_oss_proc_free_setup_list(pstr);
3101 }
3102 }
3103 #else /* !CONFIG_SND_VERBOSE_PROCFS */
snd_pcm_oss_proc_init(struct snd_pcm * pcm)3104 static inline void snd_pcm_oss_proc_init(struct snd_pcm *pcm)
3105 {
3106 }
snd_pcm_oss_proc_done(struct snd_pcm * pcm)3107 static inline void snd_pcm_oss_proc_done(struct snd_pcm *pcm)
3108 {
3109 }
3110 #endif /* CONFIG_SND_VERBOSE_PROCFS */
3111
3112 /*
3113 * ENTRY functions
3114 */
3115
3116 static const struct file_operations snd_pcm_oss_f_reg =
3117 {
3118 .owner = THIS_MODULE,
3119 .read = snd_pcm_oss_read,
3120 .write = snd_pcm_oss_write,
3121 .open = snd_pcm_oss_open,
3122 .release = snd_pcm_oss_release,
3123 .llseek = no_llseek,
3124 .poll = snd_pcm_oss_poll,
3125 .unlocked_ioctl = snd_pcm_oss_ioctl,
3126 .compat_ioctl = snd_pcm_oss_ioctl_compat,
3127 .mmap = snd_pcm_oss_mmap,
3128 };
3129
register_oss_dsp(struct snd_pcm * pcm,int index)3130 static void register_oss_dsp(struct snd_pcm *pcm, int index)
3131 {
3132 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3133 pcm->card, index, &snd_pcm_oss_f_reg,
3134 pcm) < 0) {
3135 pcm_err(pcm, "unable to register OSS PCM device %i:%i\n",
3136 pcm->card->number, pcm->device);
3137 }
3138 }
3139
snd_pcm_oss_register_minor(struct snd_pcm * pcm)3140 static int snd_pcm_oss_register_minor(struct snd_pcm *pcm)
3141 {
3142 pcm->oss.reg = 0;
3143 if (dsp_map[pcm->card->number] == (int)pcm->device) {
3144 char name[128];
3145 int duplex;
3146 register_oss_dsp(pcm, 0);
3147 duplex = (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count > 0 &&
3148 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count &&
3149 !(pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX));
3150 sprintf(name, "%s%s", pcm->name, duplex ? " (DUPLEX)" : "");
3151 #ifdef SNDRV_OSS_INFO_DEV_AUDIO
3152 snd_oss_info_register(SNDRV_OSS_INFO_DEV_AUDIO,
3153 pcm->card->number,
3154 name);
3155 #endif
3156 pcm->oss.reg++;
3157 pcm->oss.reg_mask |= 1;
3158 }
3159 if (adsp_map[pcm->card->number] == (int)pcm->device) {
3160 register_oss_dsp(pcm, 1);
3161 pcm->oss.reg++;
3162 pcm->oss.reg_mask |= 2;
3163 }
3164
3165 if (pcm->oss.reg)
3166 snd_pcm_oss_proc_init(pcm);
3167
3168 return 0;
3169 }
3170
snd_pcm_oss_disconnect_minor(struct snd_pcm * pcm)3171 static int snd_pcm_oss_disconnect_minor(struct snd_pcm *pcm)
3172 {
3173 if (pcm->oss.reg) {
3174 if (pcm->oss.reg_mask & 1) {
3175 pcm->oss.reg_mask &= ~1;
3176 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3177 pcm->card, 0);
3178 }
3179 if (pcm->oss.reg_mask & 2) {
3180 pcm->oss.reg_mask &= ~2;
3181 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3182 pcm->card, 1);
3183 }
3184 if (dsp_map[pcm->card->number] == (int)pcm->device) {
3185 #ifdef SNDRV_OSS_INFO_DEV_AUDIO
3186 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_AUDIO, pcm->card->number);
3187 #endif
3188 }
3189 pcm->oss.reg = 0;
3190 }
3191 return 0;
3192 }
3193
snd_pcm_oss_unregister_minor(struct snd_pcm * pcm)3194 static int snd_pcm_oss_unregister_minor(struct snd_pcm *pcm)
3195 {
3196 snd_pcm_oss_disconnect_minor(pcm);
3197 snd_pcm_oss_proc_done(pcm);
3198 return 0;
3199 }
3200
3201 static struct snd_pcm_notify snd_pcm_oss_notify =
3202 {
3203 .n_register = snd_pcm_oss_register_minor,
3204 .n_disconnect = snd_pcm_oss_disconnect_minor,
3205 .n_unregister = snd_pcm_oss_unregister_minor,
3206 };
3207
alsa_pcm_oss_init(void)3208 static int __init alsa_pcm_oss_init(void)
3209 {
3210 int i;
3211 int err;
3212
3213 /* check device map table */
3214 for (i = 0; i < SNDRV_CARDS; i++) {
3215 if (dsp_map[i] < 0 || dsp_map[i] >= SNDRV_PCM_DEVICES) {
3216 pr_err("ALSA: pcm_oss: invalid dsp_map[%d] = %d\n",
3217 i, dsp_map[i]);
3218 dsp_map[i] = 0;
3219 }
3220 if (adsp_map[i] < 0 || adsp_map[i] >= SNDRV_PCM_DEVICES) {
3221 pr_err("ALSA: pcm_oss: invalid adsp_map[%d] = %d\n",
3222 i, adsp_map[i]);
3223 adsp_map[i] = 1;
3224 }
3225 }
3226 err = snd_pcm_notify(&snd_pcm_oss_notify, 0);
3227 if (err < 0)
3228 return err;
3229 return 0;
3230 }
3231
alsa_pcm_oss_exit(void)3232 static void __exit alsa_pcm_oss_exit(void)
3233 {
3234 snd_pcm_notify(&snd_pcm_oss_notify, 1);
3235 }
3236
3237 module_init(alsa_pcm_oss_init)
3238 module_exit(alsa_pcm_oss_exit)
3239