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 if ((err = snd_pcm_plug_format_plugins(substream,
972 params,
973 sparams)) < 0) {
974 pcm_dbg(substream->pcm,
975 "snd_pcm_plug_format_plugins failed: %i\n", err);
976 snd_pcm_oss_plugin_clear(substream);
977 goto failure;
978 }
979 if (runtime->oss.plugin_first) {
980 struct snd_pcm_plugin *plugin;
981 if ((err = snd_pcm_plugin_build_io(substream, sparams, &plugin)) < 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 if ((err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_SW_PARAMS, sw_params)) < 0) {
1028 pcm_dbg(substream->pcm, "SW_PARAMS failed: %i\n", err);
1029 goto failure;
1030 }
1031
1032 runtime->oss.periods = params_periods(sparams);
1033 oss_period_size = snd_pcm_plug_client_size(substream, params_period_size(sparams));
1034 if (oss_period_size < 0) {
1035 err = -EINVAL;
1036 goto failure;
1037 }
1038 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1039 if (runtime->oss.plugin_first) {
1040 err = snd_pcm_plug_alloc(substream, oss_period_size);
1041 if (err < 0)
1042 goto failure;
1043 }
1044 #endif
1045 oss_period_size *= oss_frame_size;
1046
1047 oss_buffer_size = oss_period_size * runtime->oss.periods;
1048 if (oss_buffer_size < 0) {
1049 err = -EINVAL;
1050 goto failure;
1051 }
1052
1053 runtime->oss.period_bytes = oss_period_size;
1054 runtime->oss.buffer_bytes = oss_buffer_size;
1055
1056 pdprintf("oss: period bytes = %i, buffer bytes = %i\n",
1057 runtime->oss.period_bytes,
1058 runtime->oss.buffer_bytes);
1059 pdprintf("slave: period_size = %i, buffer_size = %i\n",
1060 params_period_size(sparams),
1061 params_buffer_size(sparams));
1062
1063 runtime->oss.format = snd_pcm_oss_format_to(params_format(params));
1064 runtime->oss.channels = params_channels(params);
1065 runtime->oss.rate = params_rate(params);
1066
1067 kvfree(runtime->oss.buffer);
1068 runtime->oss.buffer = kvzalloc(runtime->oss.period_bytes, GFP_KERNEL);
1069 if (!runtime->oss.buffer) {
1070 err = -ENOMEM;
1071 goto failure;
1072 }
1073
1074 runtime->oss.params = 0;
1075 runtime->oss.prepare = 1;
1076 runtime->oss.buffer_used = 0;
1077 if (runtime->dma_area)
1078 snd_pcm_format_set_silence(runtime->format, runtime->dma_area, bytes_to_samples(runtime, runtime->dma_bytes));
1079
1080 runtime->oss.period_frames = snd_pcm_alsa_frames(substream, oss_period_size);
1081
1082 err = 0;
1083 failure:
1084 kfree(sw_params);
1085 kfree(params);
1086 kfree(sparams);
1087 return err;
1088 }
1089
1090 /* this one takes the lock by itself */
snd_pcm_oss_change_params(struct snd_pcm_substream * substream,bool trylock)1091 static int snd_pcm_oss_change_params(struct snd_pcm_substream *substream,
1092 bool trylock)
1093 {
1094 struct snd_pcm_runtime *runtime = substream->runtime;
1095 int err;
1096
1097 if (trylock) {
1098 if (!(mutex_trylock(&runtime->oss.params_lock)))
1099 return -EAGAIN;
1100 } else if (mutex_lock_interruptible(&runtime->oss.params_lock))
1101 return -ERESTARTSYS;
1102
1103 err = snd_pcm_oss_change_params_locked(substream);
1104 mutex_unlock(&runtime->oss.params_lock);
1105 return err;
1106 }
1107
snd_pcm_oss_get_active_substream(struct snd_pcm_oss_file * pcm_oss_file,struct snd_pcm_substream ** r_substream)1108 static int snd_pcm_oss_get_active_substream(struct snd_pcm_oss_file *pcm_oss_file, struct snd_pcm_substream **r_substream)
1109 {
1110 int idx, err;
1111 struct snd_pcm_substream *asubstream = NULL, *substream;
1112
1113 for (idx = 0; idx < 2; idx++) {
1114 substream = pcm_oss_file->streams[idx];
1115 if (substream == NULL)
1116 continue;
1117 if (asubstream == NULL)
1118 asubstream = substream;
1119 if (substream->runtime->oss.params) {
1120 err = snd_pcm_oss_change_params(substream, false);
1121 if (err < 0)
1122 return err;
1123 }
1124 }
1125 if (!asubstream)
1126 return -EIO;
1127 if (r_substream)
1128 *r_substream = asubstream;
1129 return 0;
1130 }
1131
1132 /* call with params_lock held */
1133 /* NOTE: this always call PREPARE unconditionally no matter whether
1134 * runtime->oss.prepare is set or not
1135 */
snd_pcm_oss_prepare(struct snd_pcm_substream * substream)1136 static int snd_pcm_oss_prepare(struct snd_pcm_substream *substream)
1137 {
1138 int err;
1139 struct snd_pcm_runtime *runtime = substream->runtime;
1140
1141 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PREPARE, NULL);
1142 if (err < 0) {
1143 pcm_dbg(substream->pcm,
1144 "snd_pcm_oss_prepare: SNDRV_PCM_IOCTL_PREPARE failed\n");
1145 return err;
1146 }
1147 runtime->oss.prepare = 0;
1148 runtime->oss.prev_hw_ptr_period = 0;
1149 runtime->oss.period_ptr = 0;
1150 runtime->oss.buffer_used = 0;
1151
1152 return 0;
1153 }
1154
snd_pcm_oss_make_ready(struct snd_pcm_substream * substream)1155 static int snd_pcm_oss_make_ready(struct snd_pcm_substream *substream)
1156 {
1157 struct snd_pcm_runtime *runtime;
1158 int err;
1159
1160 runtime = substream->runtime;
1161 if (runtime->oss.params) {
1162 err = snd_pcm_oss_change_params(substream, false);
1163 if (err < 0)
1164 return err;
1165 }
1166 if (runtime->oss.prepare) {
1167 if (mutex_lock_interruptible(&runtime->oss.params_lock))
1168 return -ERESTARTSYS;
1169 err = snd_pcm_oss_prepare(substream);
1170 mutex_unlock(&runtime->oss.params_lock);
1171 if (err < 0)
1172 return err;
1173 }
1174 return 0;
1175 }
1176
1177 /* call with params_lock held */
snd_pcm_oss_make_ready_locked(struct snd_pcm_substream * substream)1178 static int snd_pcm_oss_make_ready_locked(struct snd_pcm_substream *substream)
1179 {
1180 struct snd_pcm_runtime *runtime;
1181 int err;
1182
1183 runtime = substream->runtime;
1184 if (runtime->oss.params) {
1185 err = snd_pcm_oss_change_params_locked(substream);
1186 if (err < 0)
1187 return err;
1188 }
1189 if (runtime->oss.prepare) {
1190 err = snd_pcm_oss_prepare(substream);
1191 if (err < 0)
1192 return err;
1193 }
1194 return 0;
1195 }
1196
snd_pcm_oss_capture_position_fixup(struct snd_pcm_substream * substream,snd_pcm_sframes_t * delay)1197 static int snd_pcm_oss_capture_position_fixup(struct snd_pcm_substream *substream, snd_pcm_sframes_t *delay)
1198 {
1199 struct snd_pcm_runtime *runtime;
1200 snd_pcm_uframes_t frames;
1201 int err = 0;
1202
1203 while (1) {
1204 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, delay);
1205 if (err < 0)
1206 break;
1207 runtime = substream->runtime;
1208 if (*delay <= (snd_pcm_sframes_t)runtime->buffer_size)
1209 break;
1210 /* in case of overrun, skip whole periods like OSS/Linux driver does */
1211 /* until avail(delay) <= buffer_size */
1212 frames = (*delay - runtime->buffer_size) + runtime->period_size - 1;
1213 frames /= runtime->period_size;
1214 frames *= runtime->period_size;
1215 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_FORWARD, &frames);
1216 if (err < 0)
1217 break;
1218 }
1219 return err;
1220 }
1221
snd_pcm_oss_write3(struct snd_pcm_substream * substream,const char * ptr,snd_pcm_uframes_t frames,int in_kernel)1222 snd_pcm_sframes_t snd_pcm_oss_write3(struct snd_pcm_substream *substream, const char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1223 {
1224 struct snd_pcm_runtime *runtime = substream->runtime;
1225 int ret;
1226 while (1) {
1227 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1228 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1229 #ifdef OSS_DEBUG
1230 pcm_dbg(substream->pcm,
1231 "pcm_oss: write: recovering from %s\n",
1232 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1233 "XRUN" : "SUSPEND");
1234 #endif
1235 ret = snd_pcm_oss_prepare(substream);
1236 if (ret < 0)
1237 break;
1238 }
1239 mutex_unlock(&runtime->oss.params_lock);
1240 ret = __snd_pcm_lib_xfer(substream, (void *)ptr, true,
1241 frames, in_kernel);
1242 mutex_lock(&runtime->oss.params_lock);
1243 if (ret != -EPIPE && ret != -ESTRPIPE)
1244 break;
1245 /* test, if we can't store new data, because the stream */
1246 /* has not been started */
1247 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED)
1248 return -EAGAIN;
1249 }
1250 return ret;
1251 }
1252
snd_pcm_oss_read3(struct snd_pcm_substream * substream,char * ptr,snd_pcm_uframes_t frames,int in_kernel)1253 snd_pcm_sframes_t snd_pcm_oss_read3(struct snd_pcm_substream *substream, char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1254 {
1255 struct snd_pcm_runtime *runtime = substream->runtime;
1256 snd_pcm_sframes_t delay;
1257 int ret;
1258 while (1) {
1259 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1260 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1261 #ifdef OSS_DEBUG
1262 pcm_dbg(substream->pcm,
1263 "pcm_oss: read: recovering from %s\n",
1264 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1265 "XRUN" : "SUSPEND");
1266 #endif
1267 ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1268 if (ret < 0)
1269 break;
1270 } else if (runtime->status->state == SNDRV_PCM_STATE_SETUP) {
1271 ret = snd_pcm_oss_prepare(substream);
1272 if (ret < 0)
1273 break;
1274 }
1275 ret = snd_pcm_oss_capture_position_fixup(substream, &delay);
1276 if (ret < 0)
1277 break;
1278 mutex_unlock(&runtime->oss.params_lock);
1279 ret = __snd_pcm_lib_xfer(substream, (void *)ptr, true,
1280 frames, in_kernel);
1281 mutex_lock(&runtime->oss.params_lock);
1282 if (ret == -EPIPE) {
1283 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1284 ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1285 if (ret < 0)
1286 break;
1287 }
1288 continue;
1289 }
1290 if (ret != -ESTRPIPE)
1291 break;
1292 }
1293 return ret;
1294 }
1295
1296 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
snd_pcm_oss_writev3(struct snd_pcm_substream * substream,void ** bufs,snd_pcm_uframes_t frames)1297 snd_pcm_sframes_t snd_pcm_oss_writev3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames)
1298 {
1299 struct snd_pcm_runtime *runtime = substream->runtime;
1300 int ret;
1301 while (1) {
1302 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1303 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1304 #ifdef OSS_DEBUG
1305 pcm_dbg(substream->pcm,
1306 "pcm_oss: writev: recovering from %s\n",
1307 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1308 "XRUN" : "SUSPEND");
1309 #endif
1310 ret = snd_pcm_oss_prepare(substream);
1311 if (ret < 0)
1312 break;
1313 }
1314 ret = snd_pcm_kernel_writev(substream, bufs, frames);
1315 if (ret != -EPIPE && ret != -ESTRPIPE)
1316 break;
1317
1318 /* test, if we can't store new data, because the stream */
1319 /* has not been started */
1320 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED)
1321 return -EAGAIN;
1322 }
1323 return ret;
1324 }
1325
snd_pcm_oss_readv3(struct snd_pcm_substream * substream,void ** bufs,snd_pcm_uframes_t frames)1326 snd_pcm_sframes_t snd_pcm_oss_readv3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames)
1327 {
1328 struct snd_pcm_runtime *runtime = substream->runtime;
1329 int ret;
1330 while (1) {
1331 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1332 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1333 #ifdef OSS_DEBUG
1334 pcm_dbg(substream->pcm,
1335 "pcm_oss: readv: recovering from %s\n",
1336 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1337 "XRUN" : "SUSPEND");
1338 #endif
1339 ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1340 if (ret < 0)
1341 break;
1342 } else if (runtime->status->state == SNDRV_PCM_STATE_SETUP) {
1343 ret = snd_pcm_oss_prepare(substream);
1344 if (ret < 0)
1345 break;
1346 }
1347 ret = snd_pcm_kernel_readv(substream, bufs, frames);
1348 if (ret != -EPIPE && ret != -ESTRPIPE)
1349 break;
1350 }
1351 return ret;
1352 }
1353 #endif /* CONFIG_SND_PCM_OSS_PLUGINS */
1354
snd_pcm_oss_write2(struct snd_pcm_substream * substream,const char * buf,size_t bytes,int in_kernel)1355 static ssize_t snd_pcm_oss_write2(struct snd_pcm_substream *substream, const char *buf, size_t bytes, int in_kernel)
1356 {
1357 struct snd_pcm_runtime *runtime = substream->runtime;
1358 snd_pcm_sframes_t frames, frames1;
1359 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1360 if (runtime->oss.plugin_first) {
1361 struct snd_pcm_plugin_channel *channels;
1362 size_t oss_frame_bytes = (runtime->oss.plugin_first->src_width * runtime->oss.plugin_first->src_format.channels) / 8;
1363 if (!in_kernel) {
1364 if (copy_from_user(runtime->oss.buffer, (const char __force __user *)buf, bytes))
1365 return -EFAULT;
1366 buf = runtime->oss.buffer;
1367 }
1368 frames = bytes / oss_frame_bytes;
1369 frames1 = snd_pcm_plug_client_channels_buf(substream, (char *)buf, frames, &channels);
1370 if (frames1 < 0)
1371 return frames1;
1372 frames1 = snd_pcm_plug_write_transfer(substream, channels, frames1);
1373 if (frames1 <= 0)
1374 return frames1;
1375 bytes = frames1 * oss_frame_bytes;
1376 } else
1377 #endif
1378 {
1379 frames = bytes_to_frames(runtime, bytes);
1380 frames1 = snd_pcm_oss_write3(substream, buf, frames, in_kernel);
1381 if (frames1 <= 0)
1382 return frames1;
1383 bytes = frames_to_bytes(runtime, frames1);
1384 }
1385 return bytes;
1386 }
1387
snd_pcm_oss_write1(struct snd_pcm_substream * substream,const char __user * buf,size_t bytes)1388 static ssize_t snd_pcm_oss_write1(struct snd_pcm_substream *substream, const char __user *buf, size_t bytes)
1389 {
1390 size_t xfer = 0;
1391 ssize_t tmp = 0;
1392 struct snd_pcm_runtime *runtime = substream->runtime;
1393
1394 if (atomic_read(&substream->mmap_count))
1395 return -ENXIO;
1396
1397 atomic_inc(&runtime->oss.rw_ref);
1398 while (bytes > 0) {
1399 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1400 tmp = -ERESTARTSYS;
1401 break;
1402 }
1403 tmp = snd_pcm_oss_make_ready_locked(substream);
1404 if (tmp < 0)
1405 goto err;
1406 if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1407 tmp = bytes;
1408 if (tmp + runtime->oss.buffer_used > runtime->oss.period_bytes)
1409 tmp = runtime->oss.period_bytes - runtime->oss.buffer_used;
1410 if (tmp > 0) {
1411 if (copy_from_user(runtime->oss.buffer + runtime->oss.buffer_used, buf, tmp)) {
1412 tmp = -EFAULT;
1413 goto err;
1414 }
1415 }
1416 runtime->oss.buffer_used += tmp;
1417 buf += tmp;
1418 bytes -= tmp;
1419 xfer += tmp;
1420 if (substream->oss.setup.partialfrag ||
1421 runtime->oss.buffer_used == runtime->oss.period_bytes) {
1422 tmp = snd_pcm_oss_write2(substream, runtime->oss.buffer + runtime->oss.period_ptr,
1423 runtime->oss.buffer_used - runtime->oss.period_ptr, 1);
1424 if (tmp <= 0)
1425 goto err;
1426 runtime->oss.bytes += tmp;
1427 runtime->oss.period_ptr += tmp;
1428 runtime->oss.period_ptr %= runtime->oss.period_bytes;
1429 if (runtime->oss.period_ptr == 0 ||
1430 runtime->oss.period_ptr == runtime->oss.buffer_used)
1431 runtime->oss.buffer_used = 0;
1432 else if ((substream->f_flags & O_NONBLOCK) != 0) {
1433 tmp = -EAGAIN;
1434 goto err;
1435 }
1436 }
1437 } else {
1438 tmp = snd_pcm_oss_write2(substream,
1439 (const char __force *)buf,
1440 runtime->oss.period_bytes, 0);
1441 if (tmp <= 0)
1442 goto err;
1443 runtime->oss.bytes += tmp;
1444 buf += tmp;
1445 bytes -= tmp;
1446 xfer += tmp;
1447 if ((substream->f_flags & O_NONBLOCK) != 0 &&
1448 tmp != runtime->oss.period_bytes)
1449 tmp = -EAGAIN;
1450 }
1451 err:
1452 mutex_unlock(&runtime->oss.params_lock);
1453 if (tmp < 0)
1454 break;
1455 if (signal_pending(current)) {
1456 tmp = -ERESTARTSYS;
1457 break;
1458 }
1459 tmp = 0;
1460 }
1461 atomic_dec(&runtime->oss.rw_ref);
1462 return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1463 }
1464
snd_pcm_oss_read2(struct snd_pcm_substream * substream,char * buf,size_t bytes,int in_kernel)1465 static ssize_t snd_pcm_oss_read2(struct snd_pcm_substream *substream, char *buf, size_t bytes, int in_kernel)
1466 {
1467 struct snd_pcm_runtime *runtime = substream->runtime;
1468 snd_pcm_sframes_t frames, frames1;
1469 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1470 char __user *final_dst = (char __force __user *)buf;
1471 if (runtime->oss.plugin_first) {
1472 struct snd_pcm_plugin_channel *channels;
1473 size_t oss_frame_bytes = (runtime->oss.plugin_last->dst_width * runtime->oss.plugin_last->dst_format.channels) / 8;
1474 if (!in_kernel)
1475 buf = runtime->oss.buffer;
1476 frames = bytes / oss_frame_bytes;
1477 frames1 = snd_pcm_plug_client_channels_buf(substream, buf, frames, &channels);
1478 if (frames1 < 0)
1479 return frames1;
1480 frames1 = snd_pcm_plug_read_transfer(substream, channels, frames1);
1481 if (frames1 <= 0)
1482 return frames1;
1483 bytes = frames1 * oss_frame_bytes;
1484 if (!in_kernel && copy_to_user(final_dst, buf, bytes))
1485 return -EFAULT;
1486 } else
1487 #endif
1488 {
1489 frames = bytes_to_frames(runtime, bytes);
1490 frames1 = snd_pcm_oss_read3(substream, buf, frames, in_kernel);
1491 if (frames1 <= 0)
1492 return frames1;
1493 bytes = frames_to_bytes(runtime, frames1);
1494 }
1495 return bytes;
1496 }
1497
snd_pcm_oss_read1(struct snd_pcm_substream * substream,char __user * buf,size_t bytes)1498 static ssize_t snd_pcm_oss_read1(struct snd_pcm_substream *substream, char __user *buf, size_t bytes)
1499 {
1500 size_t xfer = 0;
1501 ssize_t tmp = 0;
1502 struct snd_pcm_runtime *runtime = substream->runtime;
1503
1504 if (atomic_read(&substream->mmap_count))
1505 return -ENXIO;
1506
1507 atomic_inc(&runtime->oss.rw_ref);
1508 while (bytes > 0) {
1509 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1510 tmp = -ERESTARTSYS;
1511 break;
1512 }
1513 tmp = snd_pcm_oss_make_ready_locked(substream);
1514 if (tmp < 0)
1515 goto err;
1516 if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1517 if (runtime->oss.buffer_used == 0) {
1518 tmp = snd_pcm_oss_read2(substream, runtime->oss.buffer, runtime->oss.period_bytes, 1);
1519 if (tmp <= 0)
1520 goto err;
1521 runtime->oss.bytes += tmp;
1522 runtime->oss.period_ptr = tmp;
1523 runtime->oss.buffer_used = tmp;
1524 }
1525 tmp = bytes;
1526 if ((size_t) tmp > runtime->oss.buffer_used)
1527 tmp = runtime->oss.buffer_used;
1528 if (copy_to_user(buf, runtime->oss.buffer + (runtime->oss.period_ptr - runtime->oss.buffer_used), tmp)) {
1529 tmp = -EFAULT;
1530 goto err;
1531 }
1532 buf += tmp;
1533 bytes -= tmp;
1534 xfer += tmp;
1535 runtime->oss.buffer_used -= tmp;
1536 } else {
1537 tmp = snd_pcm_oss_read2(substream, (char __force *)buf,
1538 runtime->oss.period_bytes, 0);
1539 if (tmp <= 0)
1540 goto err;
1541 runtime->oss.bytes += tmp;
1542 buf += tmp;
1543 bytes -= tmp;
1544 xfer += tmp;
1545 }
1546 err:
1547 mutex_unlock(&runtime->oss.params_lock);
1548 if (tmp < 0)
1549 break;
1550 if (signal_pending(current)) {
1551 tmp = -ERESTARTSYS;
1552 break;
1553 }
1554 tmp = 0;
1555 }
1556 atomic_dec(&runtime->oss.rw_ref);
1557 return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1558 }
1559
snd_pcm_oss_reset(struct snd_pcm_oss_file * pcm_oss_file)1560 static int snd_pcm_oss_reset(struct snd_pcm_oss_file *pcm_oss_file)
1561 {
1562 struct snd_pcm_substream *substream;
1563 struct snd_pcm_runtime *runtime;
1564 int i;
1565
1566 for (i = 0; i < 2; i++) {
1567 substream = pcm_oss_file->streams[i];
1568 if (!substream)
1569 continue;
1570 runtime = substream->runtime;
1571 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1572 mutex_lock(&runtime->oss.params_lock);
1573 runtime->oss.prepare = 1;
1574 runtime->oss.buffer_used = 0;
1575 runtime->oss.prev_hw_ptr_period = 0;
1576 runtime->oss.period_ptr = 0;
1577 mutex_unlock(&runtime->oss.params_lock);
1578 }
1579 return 0;
1580 }
1581
snd_pcm_oss_post(struct snd_pcm_oss_file * pcm_oss_file)1582 static int snd_pcm_oss_post(struct snd_pcm_oss_file *pcm_oss_file)
1583 {
1584 struct snd_pcm_substream *substream;
1585 int err;
1586
1587 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1588 if (substream != NULL) {
1589 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
1590 return err;
1591 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_START, NULL);
1592 }
1593 /* note: all errors from the start action are ignored */
1594 /* OSS apps do not know, how to handle them */
1595 return 0;
1596 }
1597
snd_pcm_oss_sync1(struct snd_pcm_substream * substream,size_t size)1598 static int snd_pcm_oss_sync1(struct snd_pcm_substream *substream, size_t size)
1599 {
1600 struct snd_pcm_runtime *runtime;
1601 ssize_t result = 0;
1602 snd_pcm_state_t state;
1603 long res;
1604 wait_queue_entry_t wait;
1605
1606 runtime = substream->runtime;
1607 init_waitqueue_entry(&wait, current);
1608 add_wait_queue(&runtime->sleep, &wait);
1609 #ifdef OSS_DEBUG
1610 pcm_dbg(substream->pcm, "sync1: size = %li\n", size);
1611 #endif
1612 while (1) {
1613 result = snd_pcm_oss_write2(substream, runtime->oss.buffer, size, 1);
1614 if (result > 0) {
1615 runtime->oss.buffer_used = 0;
1616 result = 0;
1617 break;
1618 }
1619 if (result != 0 && result != -EAGAIN)
1620 break;
1621 result = 0;
1622 set_current_state(TASK_INTERRUPTIBLE);
1623 snd_pcm_stream_lock_irq(substream);
1624 state = runtime->status->state;
1625 snd_pcm_stream_unlock_irq(substream);
1626 if (state != SNDRV_PCM_STATE_RUNNING) {
1627 set_current_state(TASK_RUNNING);
1628 break;
1629 }
1630 res = schedule_timeout(10 * HZ);
1631 if (signal_pending(current)) {
1632 result = -ERESTARTSYS;
1633 break;
1634 }
1635 if (res == 0) {
1636 pcm_err(substream->pcm,
1637 "OSS sync error - DMA timeout\n");
1638 result = -EIO;
1639 break;
1640 }
1641 }
1642 remove_wait_queue(&runtime->sleep, &wait);
1643 return result;
1644 }
1645
snd_pcm_oss_sync(struct snd_pcm_oss_file * pcm_oss_file)1646 static int snd_pcm_oss_sync(struct snd_pcm_oss_file *pcm_oss_file)
1647 {
1648 int err = 0;
1649 unsigned int saved_f_flags;
1650 struct snd_pcm_substream *substream;
1651 struct snd_pcm_runtime *runtime;
1652 snd_pcm_format_t format;
1653 unsigned long width;
1654 size_t size;
1655
1656 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1657 if (substream != NULL) {
1658 runtime = substream->runtime;
1659 if (atomic_read(&substream->mmap_count))
1660 goto __direct;
1661 atomic_inc(&runtime->oss.rw_ref);
1662 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1663 atomic_dec(&runtime->oss.rw_ref);
1664 return -ERESTARTSYS;
1665 }
1666 err = snd_pcm_oss_make_ready_locked(substream);
1667 if (err < 0)
1668 goto unlock;
1669 format = snd_pcm_oss_format_from(runtime->oss.format);
1670 width = snd_pcm_format_physical_width(format);
1671 if (runtime->oss.buffer_used > 0) {
1672 #ifdef OSS_DEBUG
1673 pcm_dbg(substream->pcm, "sync: buffer_used\n");
1674 #endif
1675 size = (8 * (runtime->oss.period_bytes - runtime->oss.buffer_used) + 7) / width;
1676 snd_pcm_format_set_silence(format,
1677 runtime->oss.buffer + runtime->oss.buffer_used,
1678 size);
1679 err = snd_pcm_oss_sync1(substream, runtime->oss.period_bytes);
1680 if (err < 0)
1681 goto unlock;
1682 } else if (runtime->oss.period_ptr > 0) {
1683 #ifdef OSS_DEBUG
1684 pcm_dbg(substream->pcm, "sync: period_ptr\n");
1685 #endif
1686 size = runtime->oss.period_bytes - runtime->oss.period_ptr;
1687 snd_pcm_format_set_silence(format,
1688 runtime->oss.buffer,
1689 size * 8 / width);
1690 err = snd_pcm_oss_sync1(substream, size);
1691 if (err < 0)
1692 goto unlock;
1693 }
1694 /*
1695 * The ALSA's period might be a bit large than OSS one.
1696 * Fill the remain portion of ALSA period with zeros.
1697 */
1698 size = runtime->control->appl_ptr % runtime->period_size;
1699 if (size > 0) {
1700 size = runtime->period_size - size;
1701 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED)
1702 snd_pcm_lib_write(substream, NULL, size);
1703 else if (runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
1704 snd_pcm_lib_writev(substream, NULL, size);
1705 }
1706 unlock:
1707 mutex_unlock(&runtime->oss.params_lock);
1708 atomic_dec(&runtime->oss.rw_ref);
1709 if (err < 0)
1710 return err;
1711 /*
1712 * finish sync: drain the buffer
1713 */
1714 __direct:
1715 saved_f_flags = substream->f_flags;
1716 substream->f_flags &= ~O_NONBLOCK;
1717 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1718 substream->f_flags = saved_f_flags;
1719 if (err < 0)
1720 return err;
1721 mutex_lock(&runtime->oss.params_lock);
1722 runtime->oss.prepare = 1;
1723 mutex_unlock(&runtime->oss.params_lock);
1724 }
1725
1726 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
1727 if (substream != NULL) {
1728 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
1729 return err;
1730 runtime = substream->runtime;
1731 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1732 if (err < 0)
1733 return err;
1734 mutex_lock(&runtime->oss.params_lock);
1735 runtime->oss.buffer_used = 0;
1736 runtime->oss.prepare = 1;
1737 mutex_unlock(&runtime->oss.params_lock);
1738 }
1739 return 0;
1740 }
1741
snd_pcm_oss_set_rate(struct snd_pcm_oss_file * pcm_oss_file,int rate)1742 static int snd_pcm_oss_set_rate(struct snd_pcm_oss_file *pcm_oss_file, int rate)
1743 {
1744 int idx;
1745
1746 for (idx = 1; idx >= 0; --idx) {
1747 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1748 struct snd_pcm_runtime *runtime;
1749 int err;
1750
1751 if (substream == NULL)
1752 continue;
1753 runtime = substream->runtime;
1754 if (rate < 1000)
1755 rate = 1000;
1756 else if (rate > 192000)
1757 rate = 192000;
1758 err = lock_params(runtime);
1759 if (err < 0)
1760 return err;
1761 if (runtime->oss.rate != rate) {
1762 runtime->oss.params = 1;
1763 runtime->oss.rate = rate;
1764 }
1765 unlock_params(runtime);
1766 }
1767 return snd_pcm_oss_get_rate(pcm_oss_file);
1768 }
1769
snd_pcm_oss_get_rate(struct snd_pcm_oss_file * pcm_oss_file)1770 static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file)
1771 {
1772 struct snd_pcm_substream *substream;
1773 int err;
1774
1775 if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1776 return err;
1777 return substream->runtime->oss.rate;
1778 }
1779
snd_pcm_oss_set_channels(struct snd_pcm_oss_file * pcm_oss_file,unsigned int channels)1780 static int snd_pcm_oss_set_channels(struct snd_pcm_oss_file *pcm_oss_file, unsigned int channels)
1781 {
1782 int idx;
1783 if (channels < 1)
1784 channels = 1;
1785 if (channels > 128)
1786 return -EINVAL;
1787 for (idx = 1; idx >= 0; --idx) {
1788 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1789 struct snd_pcm_runtime *runtime;
1790 int err;
1791
1792 if (substream == NULL)
1793 continue;
1794 runtime = substream->runtime;
1795 err = lock_params(runtime);
1796 if (err < 0)
1797 return err;
1798 if (runtime->oss.channels != channels) {
1799 runtime->oss.params = 1;
1800 runtime->oss.channels = channels;
1801 }
1802 unlock_params(runtime);
1803 }
1804 return snd_pcm_oss_get_channels(pcm_oss_file);
1805 }
1806
snd_pcm_oss_get_channels(struct snd_pcm_oss_file * pcm_oss_file)1807 static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file)
1808 {
1809 struct snd_pcm_substream *substream;
1810 int err;
1811
1812 if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1813 return err;
1814 return substream->runtime->oss.channels;
1815 }
1816
snd_pcm_oss_get_block_size(struct snd_pcm_oss_file * pcm_oss_file)1817 static int snd_pcm_oss_get_block_size(struct snd_pcm_oss_file *pcm_oss_file)
1818 {
1819 struct snd_pcm_substream *substream;
1820 int err;
1821
1822 if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1823 return err;
1824 return substream->runtime->oss.period_bytes;
1825 }
1826
snd_pcm_oss_get_formats(struct snd_pcm_oss_file * pcm_oss_file)1827 static int snd_pcm_oss_get_formats(struct snd_pcm_oss_file *pcm_oss_file)
1828 {
1829 struct snd_pcm_substream *substream;
1830 int err;
1831 int direct;
1832 struct snd_pcm_hw_params *params;
1833 unsigned int formats = 0;
1834 const struct snd_mask *format_mask;
1835 int fmt;
1836
1837 if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1838 return err;
1839 if (atomic_read(&substream->mmap_count))
1840 direct = 1;
1841 else
1842 direct = substream->oss.setup.direct;
1843 if (!direct)
1844 return AFMT_MU_LAW | AFMT_U8 |
1845 AFMT_S16_LE | AFMT_S16_BE |
1846 AFMT_S8 | AFMT_U16_LE |
1847 AFMT_U16_BE |
1848 AFMT_S32_LE | AFMT_S32_BE |
1849 AFMT_S24_LE | AFMT_S24_BE |
1850 AFMT_S24_PACKED;
1851 params = kmalloc(sizeof(*params), GFP_KERNEL);
1852 if (!params)
1853 return -ENOMEM;
1854 _snd_pcm_hw_params_any(params);
1855 err = snd_pcm_hw_refine(substream, params);
1856 if (err < 0)
1857 goto error;
1858 format_mask = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
1859 for (fmt = 0; fmt < 32; ++fmt) {
1860 if (snd_mask_test(format_mask, fmt)) {
1861 int f = snd_pcm_oss_format_to((__force snd_pcm_format_t)fmt);
1862 if (f >= 0)
1863 formats |= f;
1864 }
1865 }
1866
1867 error:
1868 kfree(params);
1869 return err < 0 ? err : formats;
1870 }
1871
snd_pcm_oss_set_format(struct snd_pcm_oss_file * pcm_oss_file,int format)1872 static int snd_pcm_oss_set_format(struct snd_pcm_oss_file *pcm_oss_file, int format)
1873 {
1874 int formats, idx;
1875 int err;
1876
1877 if (format != AFMT_QUERY) {
1878 formats = snd_pcm_oss_get_formats(pcm_oss_file);
1879 if (formats < 0)
1880 return formats;
1881 if (!(formats & format))
1882 format = AFMT_U8;
1883 for (idx = 1; idx >= 0; --idx) {
1884 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1885 struct snd_pcm_runtime *runtime;
1886 if (substream == NULL)
1887 continue;
1888 runtime = substream->runtime;
1889 err = lock_params(runtime);
1890 if (err < 0)
1891 return err;
1892 if (runtime->oss.format != format) {
1893 runtime->oss.params = 1;
1894 runtime->oss.format = format;
1895 }
1896 unlock_params(runtime);
1897 }
1898 }
1899 return snd_pcm_oss_get_format(pcm_oss_file);
1900 }
1901
snd_pcm_oss_get_format(struct snd_pcm_oss_file * pcm_oss_file)1902 static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file)
1903 {
1904 struct snd_pcm_substream *substream;
1905 int err;
1906
1907 if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1908 return err;
1909 return substream->runtime->oss.format;
1910 }
1911
snd_pcm_oss_set_subdivide1(struct snd_pcm_substream * substream,int subdivide)1912 static int snd_pcm_oss_set_subdivide1(struct snd_pcm_substream *substream, int subdivide)
1913 {
1914 struct snd_pcm_runtime *runtime;
1915
1916 runtime = substream->runtime;
1917 if (subdivide == 0) {
1918 subdivide = runtime->oss.subdivision;
1919 if (subdivide == 0)
1920 subdivide = 1;
1921 return subdivide;
1922 }
1923 if (runtime->oss.subdivision || runtime->oss.fragshift)
1924 return -EINVAL;
1925 if (subdivide != 1 && subdivide != 2 && subdivide != 4 &&
1926 subdivide != 8 && subdivide != 16)
1927 return -EINVAL;
1928 runtime->oss.subdivision = subdivide;
1929 runtime->oss.params = 1;
1930 return subdivide;
1931 }
1932
snd_pcm_oss_set_subdivide(struct snd_pcm_oss_file * pcm_oss_file,int subdivide)1933 static int snd_pcm_oss_set_subdivide(struct snd_pcm_oss_file *pcm_oss_file, int subdivide)
1934 {
1935 int err = -EINVAL, idx;
1936
1937 for (idx = 1; idx >= 0; --idx) {
1938 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1939 struct snd_pcm_runtime *runtime;
1940
1941 if (substream == NULL)
1942 continue;
1943 runtime = substream->runtime;
1944 err = lock_params(runtime);
1945 if (err < 0)
1946 return err;
1947 err = snd_pcm_oss_set_subdivide1(substream, subdivide);
1948 unlock_params(runtime);
1949 if (err < 0)
1950 return err;
1951 }
1952 return err;
1953 }
1954
snd_pcm_oss_set_fragment1(struct snd_pcm_substream * substream,unsigned int val)1955 static int snd_pcm_oss_set_fragment1(struct snd_pcm_substream *substream, unsigned int val)
1956 {
1957 struct snd_pcm_runtime *runtime;
1958 int fragshift;
1959
1960 runtime = substream->runtime;
1961 if (runtime->oss.subdivision || runtime->oss.fragshift)
1962 return -EINVAL;
1963 fragshift = val & 0xffff;
1964 if (fragshift >= 25) /* should be large enough */
1965 return -EINVAL;
1966 runtime->oss.fragshift = fragshift;
1967 runtime->oss.maxfrags = (val >> 16) & 0xffff;
1968 if (runtime->oss.fragshift < 4) /* < 16 */
1969 runtime->oss.fragshift = 4;
1970 if (runtime->oss.maxfrags < 2)
1971 runtime->oss.maxfrags = 2;
1972 runtime->oss.params = 1;
1973 return 0;
1974 }
1975
snd_pcm_oss_set_fragment(struct snd_pcm_oss_file * pcm_oss_file,unsigned int val)1976 static int snd_pcm_oss_set_fragment(struct snd_pcm_oss_file *pcm_oss_file, unsigned int val)
1977 {
1978 int err = -EINVAL, idx;
1979
1980 for (idx = 1; idx >= 0; --idx) {
1981 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1982 struct snd_pcm_runtime *runtime;
1983
1984 if (substream == NULL)
1985 continue;
1986 runtime = substream->runtime;
1987 err = lock_params(runtime);
1988 if (err < 0)
1989 return err;
1990 err = snd_pcm_oss_set_fragment1(substream, val);
1991 unlock_params(runtime);
1992 if (err < 0)
1993 return err;
1994 }
1995 return err;
1996 }
1997
snd_pcm_oss_nonblock(struct file * file)1998 static int snd_pcm_oss_nonblock(struct file * file)
1999 {
2000 spin_lock(&file->f_lock);
2001 file->f_flags |= O_NONBLOCK;
2002 spin_unlock(&file->f_lock);
2003 return 0;
2004 }
2005
snd_pcm_oss_get_caps1(struct snd_pcm_substream * substream,int res)2006 static int snd_pcm_oss_get_caps1(struct snd_pcm_substream *substream, int res)
2007 {
2008
2009 if (substream == NULL) {
2010 res &= ~DSP_CAP_DUPLEX;
2011 return res;
2012 }
2013 #ifdef DSP_CAP_MULTI
2014 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2015 if (substream->pstr->substream_count > 1)
2016 res |= DSP_CAP_MULTI;
2017 #endif
2018 /* DSP_CAP_REALTIME is set all times: */
2019 /* all ALSA drivers can return actual pointer in ring buffer */
2020 #if defined(DSP_CAP_REALTIME) && 0
2021 {
2022 struct snd_pcm_runtime *runtime = substream->runtime;
2023 if (runtime->info & (SNDRV_PCM_INFO_BLOCK_TRANSFER|SNDRV_PCM_INFO_BATCH))
2024 res &= ~DSP_CAP_REALTIME;
2025 }
2026 #endif
2027 return res;
2028 }
2029
snd_pcm_oss_get_caps(struct snd_pcm_oss_file * pcm_oss_file)2030 static int snd_pcm_oss_get_caps(struct snd_pcm_oss_file *pcm_oss_file)
2031 {
2032 int result, idx;
2033
2034 result = DSP_CAP_TRIGGER | DSP_CAP_MMAP | DSP_CAP_DUPLEX | DSP_CAP_REALTIME;
2035 for (idx = 0; idx < 2; idx++) {
2036 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
2037 result = snd_pcm_oss_get_caps1(substream, result);
2038 }
2039 result |= 0x0001; /* revision - same as SB AWE 64 */
2040 return result;
2041 }
2042
snd_pcm_oss_simulate_fill(struct snd_pcm_substream * substream,snd_pcm_uframes_t hw_ptr)2043 static void snd_pcm_oss_simulate_fill(struct snd_pcm_substream *substream,
2044 snd_pcm_uframes_t hw_ptr)
2045 {
2046 struct snd_pcm_runtime *runtime = substream->runtime;
2047 snd_pcm_uframes_t appl_ptr;
2048 appl_ptr = hw_ptr + runtime->buffer_size;
2049 appl_ptr %= runtime->boundary;
2050 runtime->control->appl_ptr = appl_ptr;
2051 }
2052
snd_pcm_oss_set_trigger(struct snd_pcm_oss_file * pcm_oss_file,int trigger)2053 static int snd_pcm_oss_set_trigger(struct snd_pcm_oss_file *pcm_oss_file, int trigger)
2054 {
2055 struct snd_pcm_runtime *runtime;
2056 struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2057 int err, cmd;
2058
2059 #ifdef OSS_DEBUG
2060 pr_debug("pcm_oss: trigger = 0x%x\n", trigger);
2061 #endif
2062
2063 psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2064 csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2065
2066 if (psubstream) {
2067 if ((err = snd_pcm_oss_make_ready(psubstream)) < 0)
2068 return err;
2069 }
2070 if (csubstream) {
2071 if ((err = snd_pcm_oss_make_ready(csubstream)) < 0)
2072 return err;
2073 }
2074 if (psubstream) {
2075 runtime = psubstream->runtime;
2076 cmd = 0;
2077 if (mutex_lock_interruptible(&runtime->oss.params_lock))
2078 return -ERESTARTSYS;
2079 if (trigger & PCM_ENABLE_OUTPUT) {
2080 if (runtime->oss.trigger)
2081 goto _skip1;
2082 if (atomic_read(&psubstream->mmap_count))
2083 snd_pcm_oss_simulate_fill(psubstream,
2084 get_hw_ptr_period(runtime));
2085 runtime->oss.trigger = 1;
2086 runtime->start_threshold = 1;
2087 cmd = SNDRV_PCM_IOCTL_START;
2088 } else {
2089 if (!runtime->oss.trigger)
2090 goto _skip1;
2091 runtime->oss.trigger = 0;
2092 runtime->start_threshold = runtime->boundary;
2093 cmd = SNDRV_PCM_IOCTL_DROP;
2094 runtime->oss.prepare = 1;
2095 }
2096 _skip1:
2097 mutex_unlock(&runtime->oss.params_lock);
2098 if (cmd) {
2099 err = snd_pcm_kernel_ioctl(psubstream, cmd, NULL);
2100 if (err < 0)
2101 return err;
2102 }
2103 }
2104 if (csubstream) {
2105 runtime = csubstream->runtime;
2106 cmd = 0;
2107 if (mutex_lock_interruptible(&runtime->oss.params_lock))
2108 return -ERESTARTSYS;
2109 if (trigger & PCM_ENABLE_INPUT) {
2110 if (runtime->oss.trigger)
2111 goto _skip2;
2112 runtime->oss.trigger = 1;
2113 runtime->start_threshold = 1;
2114 cmd = SNDRV_PCM_IOCTL_START;
2115 } else {
2116 if (!runtime->oss.trigger)
2117 goto _skip2;
2118 runtime->oss.trigger = 0;
2119 runtime->start_threshold = runtime->boundary;
2120 cmd = SNDRV_PCM_IOCTL_DROP;
2121 runtime->oss.prepare = 1;
2122 }
2123 _skip2:
2124 mutex_unlock(&runtime->oss.params_lock);
2125 if (cmd) {
2126 err = snd_pcm_kernel_ioctl(csubstream, cmd, NULL);
2127 if (err < 0)
2128 return err;
2129 }
2130 }
2131 return 0;
2132 }
2133
snd_pcm_oss_get_trigger(struct snd_pcm_oss_file * pcm_oss_file)2134 static int snd_pcm_oss_get_trigger(struct snd_pcm_oss_file *pcm_oss_file)
2135 {
2136 struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2137 int result = 0;
2138
2139 psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2140 csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2141 if (psubstream && psubstream->runtime && psubstream->runtime->oss.trigger)
2142 result |= PCM_ENABLE_OUTPUT;
2143 if (csubstream && csubstream->runtime && csubstream->runtime->oss.trigger)
2144 result |= PCM_ENABLE_INPUT;
2145 return result;
2146 }
2147
snd_pcm_oss_get_odelay(struct snd_pcm_oss_file * pcm_oss_file)2148 static int snd_pcm_oss_get_odelay(struct snd_pcm_oss_file *pcm_oss_file)
2149 {
2150 struct snd_pcm_substream *substream;
2151 struct snd_pcm_runtime *runtime;
2152 snd_pcm_sframes_t delay;
2153 int err;
2154
2155 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2156 if (substream == NULL)
2157 return -EINVAL;
2158 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
2159 return err;
2160 runtime = substream->runtime;
2161 if (runtime->oss.params || runtime->oss.prepare)
2162 return 0;
2163 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
2164 if (err == -EPIPE)
2165 delay = 0; /* hack for broken OSS applications */
2166 else if (err < 0)
2167 return err;
2168 return snd_pcm_oss_bytes(substream, delay);
2169 }
2170
snd_pcm_oss_get_ptr(struct snd_pcm_oss_file * pcm_oss_file,int stream,struct count_info __user * _info)2171 static int snd_pcm_oss_get_ptr(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct count_info __user * _info)
2172 {
2173 struct snd_pcm_substream *substream;
2174 struct snd_pcm_runtime *runtime;
2175 snd_pcm_sframes_t delay;
2176 int fixup;
2177 struct count_info info;
2178 int err;
2179
2180 if (_info == NULL)
2181 return -EFAULT;
2182 substream = pcm_oss_file->streams[stream];
2183 if (substream == NULL)
2184 return -EINVAL;
2185 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
2186 return err;
2187 runtime = substream->runtime;
2188 if (runtime->oss.params || runtime->oss.prepare) {
2189 memset(&info, 0, sizeof(info));
2190 if (copy_to_user(_info, &info, sizeof(info)))
2191 return -EFAULT;
2192 return 0;
2193 }
2194 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2195 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
2196 if (err == -EPIPE || err == -ESTRPIPE || (! err && delay < 0)) {
2197 err = 0;
2198 delay = 0;
2199 fixup = 0;
2200 } else {
2201 fixup = runtime->oss.buffer_used;
2202 }
2203 } else {
2204 err = snd_pcm_oss_capture_position_fixup(substream, &delay);
2205 fixup = -runtime->oss.buffer_used;
2206 }
2207 if (err < 0)
2208 return err;
2209 info.ptr = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr % runtime->buffer_size);
2210 if (atomic_read(&substream->mmap_count)) {
2211 snd_pcm_sframes_t n;
2212 delay = get_hw_ptr_period(runtime);
2213 n = delay - runtime->oss.prev_hw_ptr_period;
2214 if (n < 0)
2215 n += runtime->boundary;
2216 info.blocks = n / runtime->period_size;
2217 runtime->oss.prev_hw_ptr_period = delay;
2218 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2219 snd_pcm_oss_simulate_fill(substream, delay);
2220 info.bytes = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr) & INT_MAX;
2221 } else {
2222 delay = snd_pcm_oss_bytes(substream, delay);
2223 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2224 if (substream->oss.setup.buggyptr)
2225 info.blocks = (runtime->oss.buffer_bytes - delay - fixup) / runtime->oss.period_bytes;
2226 else
2227 info.blocks = (delay + fixup) / runtime->oss.period_bytes;
2228 info.bytes = (runtime->oss.bytes - delay) & INT_MAX;
2229 } else {
2230 delay += fixup;
2231 info.blocks = delay / runtime->oss.period_bytes;
2232 info.bytes = (runtime->oss.bytes + delay) & INT_MAX;
2233 }
2234 }
2235 if (copy_to_user(_info, &info, sizeof(info)))
2236 return -EFAULT;
2237 return 0;
2238 }
2239
snd_pcm_oss_get_space(struct snd_pcm_oss_file * pcm_oss_file,int stream,struct audio_buf_info __user * _info)2240 static int snd_pcm_oss_get_space(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct audio_buf_info __user *_info)
2241 {
2242 struct snd_pcm_substream *substream;
2243 struct snd_pcm_runtime *runtime;
2244 snd_pcm_sframes_t avail;
2245 int fixup;
2246 struct audio_buf_info info;
2247 int err;
2248
2249 if (_info == NULL)
2250 return -EFAULT;
2251 substream = pcm_oss_file->streams[stream];
2252 if (substream == NULL)
2253 return -EINVAL;
2254 runtime = substream->runtime;
2255
2256 if (runtime->oss.params &&
2257 (err = snd_pcm_oss_change_params(substream, false)) < 0)
2258 return err;
2259
2260 info.fragsize = runtime->oss.period_bytes;
2261 info.fragstotal = runtime->periods;
2262 if (runtime->oss.prepare) {
2263 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2264 info.bytes = runtime->oss.period_bytes * runtime->oss.periods;
2265 info.fragments = runtime->oss.periods;
2266 } else {
2267 info.bytes = 0;
2268 info.fragments = 0;
2269 }
2270 } else {
2271 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2272 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &avail);
2273 if (err == -EPIPE || err == -ESTRPIPE || (! err && avail < 0)) {
2274 avail = runtime->buffer_size;
2275 err = 0;
2276 fixup = 0;
2277 } else {
2278 avail = runtime->buffer_size - avail;
2279 fixup = -runtime->oss.buffer_used;
2280 }
2281 } else {
2282 err = snd_pcm_oss_capture_position_fixup(substream, &avail);
2283 fixup = runtime->oss.buffer_used;
2284 }
2285 if (err < 0)
2286 return err;
2287 info.bytes = snd_pcm_oss_bytes(substream, avail) + fixup;
2288 info.fragments = info.bytes / runtime->oss.period_bytes;
2289 }
2290
2291 #ifdef OSS_DEBUG
2292 pcm_dbg(substream->pcm,
2293 "pcm_oss: space: bytes = %i, fragments = %i, fragstotal = %i, fragsize = %i\n",
2294 info.bytes, info.fragments, info.fragstotal, info.fragsize);
2295 #endif
2296 if (copy_to_user(_info, &info, sizeof(info)))
2297 return -EFAULT;
2298 return 0;
2299 }
2300
snd_pcm_oss_get_mapbuf(struct snd_pcm_oss_file * pcm_oss_file,int stream,struct buffmem_desc __user * _info)2301 static int snd_pcm_oss_get_mapbuf(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct buffmem_desc __user * _info)
2302 {
2303 // it won't be probably implemented
2304 // pr_debug("TODO: snd_pcm_oss_get_mapbuf\n");
2305 return -EINVAL;
2306 }
2307
strip_task_path(const char * path)2308 static const char *strip_task_path(const char *path)
2309 {
2310 const char *ptr, *ptrl = NULL;
2311 for (ptr = path; *ptr; ptr++) {
2312 if (*ptr == '/')
2313 ptrl = ptr + 1;
2314 }
2315 return ptrl;
2316 }
2317
snd_pcm_oss_look_for_setup(struct snd_pcm * pcm,int stream,const char * task_name,struct snd_pcm_oss_setup * rsetup)2318 static void snd_pcm_oss_look_for_setup(struct snd_pcm *pcm, int stream,
2319 const char *task_name,
2320 struct snd_pcm_oss_setup *rsetup)
2321 {
2322 struct snd_pcm_oss_setup *setup;
2323
2324 mutex_lock(&pcm->streams[stream].oss.setup_mutex);
2325 do {
2326 for (setup = pcm->streams[stream].oss.setup_list; setup;
2327 setup = setup->next) {
2328 if (!strcmp(setup->task_name, task_name))
2329 goto out;
2330 }
2331 } while ((task_name = strip_task_path(task_name)) != NULL);
2332 out:
2333 if (setup)
2334 *rsetup = *setup;
2335 mutex_unlock(&pcm->streams[stream].oss.setup_mutex);
2336 }
2337
snd_pcm_oss_release_substream(struct snd_pcm_substream * substream)2338 static void snd_pcm_oss_release_substream(struct snd_pcm_substream *substream)
2339 {
2340 struct snd_pcm_runtime *runtime;
2341 runtime = substream->runtime;
2342 kvfree(runtime->oss.buffer);
2343 runtime->oss.buffer = NULL;
2344 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
2345 snd_pcm_oss_plugin_clear(substream);
2346 #endif
2347 substream->oss.oss = 0;
2348 }
2349
snd_pcm_oss_init_substream(struct snd_pcm_substream * substream,struct snd_pcm_oss_setup * setup,int minor)2350 static void snd_pcm_oss_init_substream(struct snd_pcm_substream *substream,
2351 struct snd_pcm_oss_setup *setup,
2352 int minor)
2353 {
2354 struct snd_pcm_runtime *runtime;
2355
2356 substream->oss.oss = 1;
2357 substream->oss.setup = *setup;
2358 if (setup->nonblock)
2359 substream->f_flags |= O_NONBLOCK;
2360 else if (setup->block)
2361 substream->f_flags &= ~O_NONBLOCK;
2362 runtime = substream->runtime;
2363 runtime->oss.params = 1;
2364 runtime->oss.trigger = 1;
2365 runtime->oss.rate = 8000;
2366 mutex_init(&runtime->oss.params_lock);
2367 switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
2368 case SNDRV_MINOR_OSS_PCM_8:
2369 runtime->oss.format = AFMT_U8;
2370 break;
2371 case SNDRV_MINOR_OSS_PCM_16:
2372 runtime->oss.format = AFMT_S16_LE;
2373 break;
2374 default:
2375 runtime->oss.format = AFMT_MU_LAW;
2376 }
2377 runtime->oss.channels = 1;
2378 runtime->oss.fragshift = 0;
2379 runtime->oss.maxfrags = 0;
2380 runtime->oss.subdivision = 0;
2381 substream->pcm_release = snd_pcm_oss_release_substream;
2382 atomic_set(&runtime->oss.rw_ref, 0);
2383 }
2384
snd_pcm_oss_release_file(struct snd_pcm_oss_file * pcm_oss_file)2385 static int snd_pcm_oss_release_file(struct snd_pcm_oss_file *pcm_oss_file)
2386 {
2387 int cidx;
2388 if (!pcm_oss_file)
2389 return 0;
2390 for (cidx = 0; cidx < 2; ++cidx) {
2391 struct snd_pcm_substream *substream = pcm_oss_file->streams[cidx];
2392 if (substream)
2393 snd_pcm_release_substream(substream);
2394 }
2395 kfree(pcm_oss_file);
2396 return 0;
2397 }
2398
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)2399 static int snd_pcm_oss_open_file(struct file *file,
2400 struct snd_pcm *pcm,
2401 struct snd_pcm_oss_file **rpcm_oss_file,
2402 int minor,
2403 struct snd_pcm_oss_setup *setup)
2404 {
2405 int idx, err;
2406 struct snd_pcm_oss_file *pcm_oss_file;
2407 struct snd_pcm_substream *substream;
2408 fmode_t f_mode = file->f_mode;
2409
2410 if (rpcm_oss_file)
2411 *rpcm_oss_file = NULL;
2412
2413 pcm_oss_file = kzalloc(sizeof(*pcm_oss_file), GFP_KERNEL);
2414 if (pcm_oss_file == NULL)
2415 return -ENOMEM;
2416
2417 if ((f_mode & (FMODE_WRITE|FMODE_READ)) == (FMODE_WRITE|FMODE_READ) &&
2418 (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX))
2419 f_mode = FMODE_WRITE;
2420
2421 file->f_flags &= ~O_APPEND;
2422 for (idx = 0; idx < 2; idx++) {
2423 if (setup[idx].disable)
2424 continue;
2425 if (! pcm->streams[idx].substream_count)
2426 continue; /* no matching substream */
2427 if (idx == SNDRV_PCM_STREAM_PLAYBACK) {
2428 if (! (f_mode & FMODE_WRITE))
2429 continue;
2430 } else {
2431 if (! (f_mode & FMODE_READ))
2432 continue;
2433 }
2434 err = snd_pcm_open_substream(pcm, idx, file, &substream);
2435 if (err < 0) {
2436 snd_pcm_oss_release_file(pcm_oss_file);
2437 return err;
2438 }
2439
2440 pcm_oss_file->streams[idx] = substream;
2441 snd_pcm_oss_init_substream(substream, &setup[idx], minor);
2442 }
2443
2444 if (!pcm_oss_file->streams[0] && !pcm_oss_file->streams[1]) {
2445 snd_pcm_oss_release_file(pcm_oss_file);
2446 return -EINVAL;
2447 }
2448
2449 file->private_data = pcm_oss_file;
2450 if (rpcm_oss_file)
2451 *rpcm_oss_file = pcm_oss_file;
2452 return 0;
2453 }
2454
2455
snd_task_name(struct task_struct * task,char * name,size_t size)2456 static int snd_task_name(struct task_struct *task, char *name, size_t size)
2457 {
2458 unsigned int idx;
2459
2460 if (snd_BUG_ON(!task || !name || size < 2))
2461 return -EINVAL;
2462 for (idx = 0; idx < sizeof(task->comm) && idx + 1 < size; idx++)
2463 name[idx] = task->comm[idx];
2464 name[idx] = '\0';
2465 return 0;
2466 }
2467
snd_pcm_oss_open(struct inode * inode,struct file * file)2468 static int snd_pcm_oss_open(struct inode *inode, struct file *file)
2469 {
2470 int err;
2471 char task_name[32];
2472 struct snd_pcm *pcm;
2473 struct snd_pcm_oss_file *pcm_oss_file;
2474 struct snd_pcm_oss_setup setup[2];
2475 int nonblock;
2476 wait_queue_entry_t wait;
2477
2478 err = nonseekable_open(inode, file);
2479 if (err < 0)
2480 return err;
2481
2482 pcm = snd_lookup_oss_minor_data(iminor(inode),
2483 SNDRV_OSS_DEVICE_TYPE_PCM);
2484 if (pcm == NULL) {
2485 err = -ENODEV;
2486 goto __error1;
2487 }
2488 err = snd_card_file_add(pcm->card, file);
2489 if (err < 0)
2490 goto __error1;
2491 if (!try_module_get(pcm->card->module)) {
2492 err = -EFAULT;
2493 goto __error2;
2494 }
2495 if (snd_task_name(current, task_name, sizeof(task_name)) < 0) {
2496 err = -EFAULT;
2497 goto __error;
2498 }
2499 memset(setup, 0, sizeof(setup));
2500 if (file->f_mode & FMODE_WRITE)
2501 snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_PLAYBACK,
2502 task_name, &setup[0]);
2503 if (file->f_mode & FMODE_READ)
2504 snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_CAPTURE,
2505 task_name, &setup[1]);
2506
2507 nonblock = !!(file->f_flags & O_NONBLOCK);
2508 if (!nonblock)
2509 nonblock = nonblock_open;
2510
2511 init_waitqueue_entry(&wait, current);
2512 add_wait_queue(&pcm->open_wait, &wait);
2513 mutex_lock(&pcm->open_mutex);
2514 while (1) {
2515 err = snd_pcm_oss_open_file(file, pcm, &pcm_oss_file,
2516 iminor(inode), setup);
2517 if (err >= 0)
2518 break;
2519 if (err == -EAGAIN) {
2520 if (nonblock) {
2521 err = -EBUSY;
2522 break;
2523 }
2524 } else
2525 break;
2526 set_current_state(TASK_INTERRUPTIBLE);
2527 mutex_unlock(&pcm->open_mutex);
2528 schedule();
2529 mutex_lock(&pcm->open_mutex);
2530 if (pcm->card->shutdown) {
2531 err = -ENODEV;
2532 break;
2533 }
2534 if (signal_pending(current)) {
2535 err = -ERESTARTSYS;
2536 break;
2537 }
2538 }
2539 remove_wait_queue(&pcm->open_wait, &wait);
2540 mutex_unlock(&pcm->open_mutex);
2541 if (err < 0)
2542 goto __error;
2543 snd_card_unref(pcm->card);
2544 return err;
2545
2546 __error:
2547 module_put(pcm->card->module);
2548 __error2:
2549 snd_card_file_remove(pcm->card, file);
2550 __error1:
2551 if (pcm)
2552 snd_card_unref(pcm->card);
2553 return err;
2554 }
2555
snd_pcm_oss_release(struct inode * inode,struct file * file)2556 static int snd_pcm_oss_release(struct inode *inode, struct file *file)
2557 {
2558 struct snd_pcm *pcm;
2559 struct snd_pcm_substream *substream;
2560 struct snd_pcm_oss_file *pcm_oss_file;
2561
2562 pcm_oss_file = file->private_data;
2563 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2564 if (substream == NULL)
2565 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2566 if (snd_BUG_ON(!substream))
2567 return -ENXIO;
2568 pcm = substream->pcm;
2569 if (!pcm->card->shutdown)
2570 snd_pcm_oss_sync(pcm_oss_file);
2571 mutex_lock(&pcm->open_mutex);
2572 snd_pcm_oss_release_file(pcm_oss_file);
2573 mutex_unlock(&pcm->open_mutex);
2574 wake_up(&pcm->open_wait);
2575 module_put(pcm->card->module);
2576 snd_card_file_remove(pcm->card, file);
2577 return 0;
2578 }
2579
snd_pcm_oss_ioctl(struct file * file,unsigned int cmd,unsigned long arg)2580 static long snd_pcm_oss_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2581 {
2582 struct snd_pcm_oss_file *pcm_oss_file;
2583 int __user *p = (int __user *)arg;
2584 int res;
2585
2586 pcm_oss_file = file->private_data;
2587 if (cmd == OSS_GETVERSION)
2588 return put_user(SNDRV_OSS_VERSION, p);
2589 if (cmd == OSS_ALSAEMULVER)
2590 return put_user(1, p);
2591 #if IS_REACHABLE(CONFIG_SND_MIXER_OSS)
2592 if (((cmd >> 8) & 0xff) == 'M') { /* mixer ioctl - for OSS compatibility */
2593 struct snd_pcm_substream *substream;
2594 int idx;
2595 for (idx = 0; idx < 2; ++idx) {
2596 substream = pcm_oss_file->streams[idx];
2597 if (substream != NULL)
2598 break;
2599 }
2600 if (snd_BUG_ON(idx >= 2))
2601 return -ENXIO;
2602 return snd_mixer_oss_ioctl_card(substream->pcm->card, cmd, arg);
2603 }
2604 #endif
2605 if (((cmd >> 8) & 0xff) != 'P')
2606 return -EINVAL;
2607 #ifdef OSS_DEBUG
2608 pr_debug("pcm_oss: ioctl = 0x%x\n", cmd);
2609 #endif
2610 switch (cmd) {
2611 case SNDCTL_DSP_RESET:
2612 return snd_pcm_oss_reset(pcm_oss_file);
2613 case SNDCTL_DSP_SYNC:
2614 return snd_pcm_oss_sync(pcm_oss_file);
2615 case SNDCTL_DSP_SPEED:
2616 if (get_user(res, p))
2617 return -EFAULT;
2618 if ((res = snd_pcm_oss_set_rate(pcm_oss_file, res))<0)
2619 return res;
2620 return put_user(res, p);
2621 case SOUND_PCM_READ_RATE:
2622 res = snd_pcm_oss_get_rate(pcm_oss_file);
2623 if (res < 0)
2624 return res;
2625 return put_user(res, p);
2626 case SNDCTL_DSP_STEREO:
2627 if (get_user(res, p))
2628 return -EFAULT;
2629 res = res > 0 ? 2 : 1;
2630 if ((res = snd_pcm_oss_set_channels(pcm_oss_file, res)) < 0)
2631 return res;
2632 return put_user(--res, p);
2633 case SNDCTL_DSP_GETBLKSIZE:
2634 res = snd_pcm_oss_get_block_size(pcm_oss_file);
2635 if (res < 0)
2636 return res;
2637 return put_user(res, p);
2638 case SNDCTL_DSP_SETFMT:
2639 if (get_user(res, p))
2640 return -EFAULT;
2641 res = snd_pcm_oss_set_format(pcm_oss_file, res);
2642 if (res < 0)
2643 return res;
2644 return put_user(res, p);
2645 case SOUND_PCM_READ_BITS:
2646 res = snd_pcm_oss_get_format(pcm_oss_file);
2647 if (res < 0)
2648 return res;
2649 return put_user(res, p);
2650 case SNDCTL_DSP_CHANNELS:
2651 if (get_user(res, p))
2652 return -EFAULT;
2653 res = snd_pcm_oss_set_channels(pcm_oss_file, res);
2654 if (res < 0)
2655 return res;
2656 return put_user(res, p);
2657 case SOUND_PCM_READ_CHANNELS:
2658 res = snd_pcm_oss_get_channels(pcm_oss_file);
2659 if (res < 0)
2660 return res;
2661 return put_user(res, p);
2662 case SOUND_PCM_WRITE_FILTER:
2663 case SOUND_PCM_READ_FILTER:
2664 return -EIO;
2665 case SNDCTL_DSP_POST:
2666 return snd_pcm_oss_post(pcm_oss_file);
2667 case SNDCTL_DSP_SUBDIVIDE:
2668 if (get_user(res, p))
2669 return -EFAULT;
2670 res = snd_pcm_oss_set_subdivide(pcm_oss_file, res);
2671 if (res < 0)
2672 return res;
2673 return put_user(res, p);
2674 case SNDCTL_DSP_SETFRAGMENT:
2675 if (get_user(res, p))
2676 return -EFAULT;
2677 return snd_pcm_oss_set_fragment(pcm_oss_file, res);
2678 case SNDCTL_DSP_GETFMTS:
2679 res = snd_pcm_oss_get_formats(pcm_oss_file);
2680 if (res < 0)
2681 return res;
2682 return put_user(res, p);
2683 case SNDCTL_DSP_GETOSPACE:
2684 case SNDCTL_DSP_GETISPACE:
2685 return snd_pcm_oss_get_space(pcm_oss_file,
2686 cmd == SNDCTL_DSP_GETISPACE ?
2687 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2688 (struct audio_buf_info __user *) arg);
2689 case SNDCTL_DSP_NONBLOCK:
2690 return snd_pcm_oss_nonblock(file);
2691 case SNDCTL_DSP_GETCAPS:
2692 res = snd_pcm_oss_get_caps(pcm_oss_file);
2693 if (res < 0)
2694 return res;
2695 return put_user(res, p);
2696 case SNDCTL_DSP_GETTRIGGER:
2697 res = snd_pcm_oss_get_trigger(pcm_oss_file);
2698 if (res < 0)
2699 return res;
2700 return put_user(res, p);
2701 case SNDCTL_DSP_SETTRIGGER:
2702 if (get_user(res, p))
2703 return -EFAULT;
2704 return snd_pcm_oss_set_trigger(pcm_oss_file, res);
2705 case SNDCTL_DSP_GETIPTR:
2706 case SNDCTL_DSP_GETOPTR:
2707 return snd_pcm_oss_get_ptr(pcm_oss_file,
2708 cmd == SNDCTL_DSP_GETIPTR ?
2709 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2710 (struct count_info __user *) arg);
2711 case SNDCTL_DSP_MAPINBUF:
2712 case SNDCTL_DSP_MAPOUTBUF:
2713 return snd_pcm_oss_get_mapbuf(pcm_oss_file,
2714 cmd == SNDCTL_DSP_MAPINBUF ?
2715 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2716 (struct buffmem_desc __user *) arg);
2717 case SNDCTL_DSP_SETSYNCRO:
2718 /* stop DMA now.. */
2719 return 0;
2720 case SNDCTL_DSP_SETDUPLEX:
2721 if (snd_pcm_oss_get_caps(pcm_oss_file) & DSP_CAP_DUPLEX)
2722 return 0;
2723 return -EIO;
2724 case SNDCTL_DSP_GETODELAY:
2725 res = snd_pcm_oss_get_odelay(pcm_oss_file);
2726 if (res < 0) {
2727 /* it's for sure, some broken apps don't check for error codes */
2728 put_user(0, p);
2729 return res;
2730 }
2731 return put_user(res, p);
2732 case SNDCTL_DSP_PROFILE:
2733 return 0; /* silently ignore */
2734 default:
2735 pr_debug("pcm_oss: unknown command = 0x%x\n", cmd);
2736 }
2737 return -EINVAL;
2738 }
2739
2740 #ifdef CONFIG_COMPAT
2741 /* all compatible */
snd_pcm_oss_ioctl_compat(struct file * file,unsigned int cmd,unsigned long arg)2742 static long snd_pcm_oss_ioctl_compat(struct file *file, unsigned int cmd,
2743 unsigned long arg)
2744 {
2745 /*
2746 * Everything is compatbile except SNDCTL_DSP_MAPINBUF/SNDCTL_DSP_MAPOUTBUF,
2747 * which are not implemented for the native case either
2748 */
2749 return snd_pcm_oss_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
2750 }
2751 #else
2752 #define snd_pcm_oss_ioctl_compat NULL
2753 #endif
2754
snd_pcm_oss_read(struct file * file,char __user * buf,size_t count,loff_t * offset)2755 static ssize_t snd_pcm_oss_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
2756 {
2757 struct snd_pcm_oss_file *pcm_oss_file;
2758 struct snd_pcm_substream *substream;
2759
2760 pcm_oss_file = file->private_data;
2761 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2762 if (substream == NULL)
2763 return -ENXIO;
2764 substream->f_flags = file->f_flags & O_NONBLOCK;
2765 #ifndef OSS_DEBUG
2766 return snd_pcm_oss_read1(substream, buf, count);
2767 #else
2768 {
2769 ssize_t res = snd_pcm_oss_read1(substream, buf, count);
2770 pcm_dbg(substream->pcm,
2771 "pcm_oss: read %li bytes (returned %li bytes)\n",
2772 (long)count, (long)res);
2773 return res;
2774 }
2775 #endif
2776 }
2777
snd_pcm_oss_write(struct file * file,const char __user * buf,size_t count,loff_t * offset)2778 static ssize_t snd_pcm_oss_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
2779 {
2780 struct snd_pcm_oss_file *pcm_oss_file;
2781 struct snd_pcm_substream *substream;
2782 long result;
2783
2784 pcm_oss_file = file->private_data;
2785 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2786 if (substream == NULL)
2787 return -ENXIO;
2788 substream->f_flags = file->f_flags & O_NONBLOCK;
2789 result = snd_pcm_oss_write1(substream, buf, count);
2790 #ifdef OSS_DEBUG
2791 pcm_dbg(substream->pcm, "pcm_oss: write %li bytes (wrote %li bytes)\n",
2792 (long)count, (long)result);
2793 #endif
2794 return result;
2795 }
2796
snd_pcm_oss_playback_ready(struct snd_pcm_substream * substream)2797 static int snd_pcm_oss_playback_ready(struct snd_pcm_substream *substream)
2798 {
2799 struct snd_pcm_runtime *runtime = substream->runtime;
2800 if (atomic_read(&substream->mmap_count))
2801 return runtime->oss.prev_hw_ptr_period !=
2802 get_hw_ptr_period(runtime);
2803 else
2804 return snd_pcm_playback_avail(runtime) >=
2805 runtime->oss.period_frames;
2806 }
2807
snd_pcm_oss_capture_ready(struct snd_pcm_substream * substream)2808 static int snd_pcm_oss_capture_ready(struct snd_pcm_substream *substream)
2809 {
2810 struct snd_pcm_runtime *runtime = substream->runtime;
2811 if (atomic_read(&substream->mmap_count))
2812 return runtime->oss.prev_hw_ptr_period !=
2813 get_hw_ptr_period(runtime);
2814 else
2815 return snd_pcm_capture_avail(runtime) >=
2816 runtime->oss.period_frames;
2817 }
2818
snd_pcm_oss_poll(struct file * file,poll_table * wait)2819 static __poll_t snd_pcm_oss_poll(struct file *file, poll_table * wait)
2820 {
2821 struct snd_pcm_oss_file *pcm_oss_file;
2822 __poll_t mask;
2823 struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2824
2825 pcm_oss_file = file->private_data;
2826
2827 psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2828 csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2829
2830 mask = 0;
2831 if (psubstream != NULL) {
2832 struct snd_pcm_runtime *runtime = psubstream->runtime;
2833 poll_wait(file, &runtime->sleep, wait);
2834 snd_pcm_stream_lock_irq(psubstream);
2835 if (runtime->status->state != SNDRV_PCM_STATE_DRAINING &&
2836 (runtime->status->state != SNDRV_PCM_STATE_RUNNING ||
2837 snd_pcm_oss_playback_ready(psubstream)))
2838 mask |= EPOLLOUT | EPOLLWRNORM;
2839 snd_pcm_stream_unlock_irq(psubstream);
2840 }
2841 if (csubstream != NULL) {
2842 struct snd_pcm_runtime *runtime = csubstream->runtime;
2843 snd_pcm_state_t ostate;
2844 poll_wait(file, &runtime->sleep, wait);
2845 snd_pcm_stream_lock_irq(csubstream);
2846 if ((ostate = runtime->status->state) != SNDRV_PCM_STATE_RUNNING ||
2847 snd_pcm_oss_capture_ready(csubstream))
2848 mask |= EPOLLIN | EPOLLRDNORM;
2849 snd_pcm_stream_unlock_irq(csubstream);
2850 if (ostate != SNDRV_PCM_STATE_RUNNING && runtime->oss.trigger) {
2851 struct snd_pcm_oss_file ofile;
2852 memset(&ofile, 0, sizeof(ofile));
2853 ofile.streams[SNDRV_PCM_STREAM_CAPTURE] = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2854 runtime->oss.trigger = 0;
2855 snd_pcm_oss_set_trigger(&ofile, PCM_ENABLE_INPUT);
2856 }
2857 }
2858
2859 return mask;
2860 }
2861
snd_pcm_oss_mmap(struct file * file,struct vm_area_struct * area)2862 static int snd_pcm_oss_mmap(struct file *file, struct vm_area_struct *area)
2863 {
2864 struct snd_pcm_oss_file *pcm_oss_file;
2865 struct snd_pcm_substream *substream = NULL;
2866 struct snd_pcm_runtime *runtime;
2867 int err;
2868
2869 #ifdef OSS_DEBUG
2870 pr_debug("pcm_oss: mmap begin\n");
2871 #endif
2872 pcm_oss_file = file->private_data;
2873 switch ((area->vm_flags & (VM_READ | VM_WRITE))) {
2874 case VM_READ | VM_WRITE:
2875 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2876 if (substream)
2877 break;
2878 fallthrough;
2879 case VM_READ:
2880 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2881 break;
2882 case VM_WRITE:
2883 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2884 break;
2885 default:
2886 return -EINVAL;
2887 }
2888 /* set VM_READ access as well to fix memset() routines that do
2889 reads before writes (to improve performance) */
2890 area->vm_flags |= VM_READ;
2891 if (substream == NULL)
2892 return -ENXIO;
2893 runtime = substream->runtime;
2894 if (!(runtime->info & SNDRV_PCM_INFO_MMAP_VALID))
2895 return -EIO;
2896 if (runtime->info & SNDRV_PCM_INFO_INTERLEAVED)
2897 runtime->access = SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2898 else
2899 return -EIO;
2900
2901 if (runtime->oss.params) {
2902 /* use mutex_trylock() for params_lock for avoiding a deadlock
2903 * between mmap_lock and params_lock taken by
2904 * copy_from/to_user() in snd_pcm_oss_write/read()
2905 */
2906 err = snd_pcm_oss_change_params(substream, true);
2907 if (err < 0)
2908 return err;
2909 }
2910 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
2911 if (runtime->oss.plugin_first != NULL)
2912 return -EIO;
2913 #endif
2914
2915 if (area->vm_pgoff != 0)
2916 return -EINVAL;
2917
2918 err = snd_pcm_mmap_data(substream, file, area);
2919 if (err < 0)
2920 return err;
2921 runtime->oss.mmap_bytes = area->vm_end - area->vm_start;
2922 runtime->silence_threshold = 0;
2923 runtime->silence_size = 0;
2924 #ifdef OSS_DEBUG
2925 pr_debug("pcm_oss: mmap ok, bytes = 0x%x\n",
2926 runtime->oss.mmap_bytes);
2927 #endif
2928 /* In mmap mode we never stop */
2929 runtime->stop_threshold = runtime->boundary;
2930
2931 return 0;
2932 }
2933
2934 #ifdef CONFIG_SND_VERBOSE_PROCFS
2935 /*
2936 * /proc interface
2937 */
2938
snd_pcm_oss_proc_read(struct snd_info_entry * entry,struct snd_info_buffer * buffer)2939 static void snd_pcm_oss_proc_read(struct snd_info_entry *entry,
2940 struct snd_info_buffer *buffer)
2941 {
2942 struct snd_pcm_str *pstr = entry->private_data;
2943 struct snd_pcm_oss_setup *setup = pstr->oss.setup_list;
2944 mutex_lock(&pstr->oss.setup_mutex);
2945 while (setup) {
2946 snd_iprintf(buffer, "%s %u %u%s%s%s%s%s%s\n",
2947 setup->task_name,
2948 setup->periods,
2949 setup->period_size,
2950 setup->disable ? " disable" : "",
2951 setup->direct ? " direct" : "",
2952 setup->block ? " block" : "",
2953 setup->nonblock ? " non-block" : "",
2954 setup->partialfrag ? " partial-frag" : "",
2955 setup->nosilence ? " no-silence" : "");
2956 setup = setup->next;
2957 }
2958 mutex_unlock(&pstr->oss.setup_mutex);
2959 }
2960
snd_pcm_oss_proc_free_setup_list(struct snd_pcm_str * pstr)2961 static void snd_pcm_oss_proc_free_setup_list(struct snd_pcm_str * pstr)
2962 {
2963 struct snd_pcm_oss_setup *setup, *setupn;
2964
2965 for (setup = pstr->oss.setup_list, pstr->oss.setup_list = NULL;
2966 setup; setup = setupn) {
2967 setupn = setup->next;
2968 kfree(setup->task_name);
2969 kfree(setup);
2970 }
2971 pstr->oss.setup_list = NULL;
2972 }
2973
snd_pcm_oss_proc_write(struct snd_info_entry * entry,struct snd_info_buffer * buffer)2974 static void snd_pcm_oss_proc_write(struct snd_info_entry *entry,
2975 struct snd_info_buffer *buffer)
2976 {
2977 struct snd_pcm_str *pstr = entry->private_data;
2978 char line[128], str[32], task_name[32];
2979 const char *ptr;
2980 int idx1;
2981 struct snd_pcm_oss_setup *setup, *setup1, template;
2982
2983 while (!snd_info_get_line(buffer, line, sizeof(line))) {
2984 mutex_lock(&pstr->oss.setup_mutex);
2985 memset(&template, 0, sizeof(template));
2986 ptr = snd_info_get_str(task_name, line, sizeof(task_name));
2987 if (!strcmp(task_name, "clear") || !strcmp(task_name, "erase")) {
2988 snd_pcm_oss_proc_free_setup_list(pstr);
2989 mutex_unlock(&pstr->oss.setup_mutex);
2990 continue;
2991 }
2992 for (setup = pstr->oss.setup_list; setup; setup = setup->next) {
2993 if (!strcmp(setup->task_name, task_name)) {
2994 template = *setup;
2995 break;
2996 }
2997 }
2998 ptr = snd_info_get_str(str, ptr, sizeof(str));
2999 template.periods = simple_strtoul(str, NULL, 10);
3000 ptr = snd_info_get_str(str, ptr, sizeof(str));
3001 template.period_size = simple_strtoul(str, NULL, 10);
3002 for (idx1 = 31; idx1 >= 0; idx1--)
3003 if (template.period_size & (1 << idx1))
3004 break;
3005 for (idx1--; idx1 >= 0; idx1--)
3006 template.period_size &= ~(1 << idx1);
3007 do {
3008 ptr = snd_info_get_str(str, ptr, sizeof(str));
3009 if (!strcmp(str, "disable")) {
3010 template.disable = 1;
3011 } else if (!strcmp(str, "direct")) {
3012 template.direct = 1;
3013 } else if (!strcmp(str, "block")) {
3014 template.block = 1;
3015 } else if (!strcmp(str, "non-block")) {
3016 template.nonblock = 1;
3017 } else if (!strcmp(str, "partial-frag")) {
3018 template.partialfrag = 1;
3019 } else if (!strcmp(str, "no-silence")) {
3020 template.nosilence = 1;
3021 } else if (!strcmp(str, "buggy-ptr")) {
3022 template.buggyptr = 1;
3023 }
3024 } while (*str);
3025 if (setup == NULL) {
3026 setup = kmalloc(sizeof(*setup), GFP_KERNEL);
3027 if (! setup) {
3028 buffer->error = -ENOMEM;
3029 mutex_unlock(&pstr->oss.setup_mutex);
3030 return;
3031 }
3032 if (pstr->oss.setup_list == NULL)
3033 pstr->oss.setup_list = setup;
3034 else {
3035 for (setup1 = pstr->oss.setup_list;
3036 setup1->next; setup1 = setup1->next);
3037 setup1->next = setup;
3038 }
3039 template.task_name = kstrdup(task_name, GFP_KERNEL);
3040 if (! template.task_name) {
3041 kfree(setup);
3042 buffer->error = -ENOMEM;
3043 mutex_unlock(&pstr->oss.setup_mutex);
3044 return;
3045 }
3046 }
3047 *setup = template;
3048 mutex_unlock(&pstr->oss.setup_mutex);
3049 }
3050 }
3051
snd_pcm_oss_proc_init(struct snd_pcm * pcm)3052 static void snd_pcm_oss_proc_init(struct snd_pcm *pcm)
3053 {
3054 int stream;
3055 for (stream = 0; stream < 2; ++stream) {
3056 struct snd_info_entry *entry;
3057 struct snd_pcm_str *pstr = &pcm->streams[stream];
3058 if (pstr->substream_count == 0)
3059 continue;
3060 if ((entry = snd_info_create_card_entry(pcm->card, "oss", pstr->proc_root)) != NULL) {
3061 entry->content = SNDRV_INFO_CONTENT_TEXT;
3062 entry->mode = S_IFREG | 0644;
3063 entry->c.text.read = snd_pcm_oss_proc_read;
3064 entry->c.text.write = snd_pcm_oss_proc_write;
3065 entry->private_data = pstr;
3066 if (snd_info_register(entry) < 0) {
3067 snd_info_free_entry(entry);
3068 entry = NULL;
3069 }
3070 }
3071 pstr->oss.proc_entry = entry;
3072 }
3073 }
3074
snd_pcm_oss_proc_done(struct snd_pcm * pcm)3075 static void snd_pcm_oss_proc_done(struct snd_pcm *pcm)
3076 {
3077 int stream;
3078 for (stream = 0; stream < 2; ++stream) {
3079 struct snd_pcm_str *pstr = &pcm->streams[stream];
3080 snd_info_free_entry(pstr->oss.proc_entry);
3081 pstr->oss.proc_entry = NULL;
3082 snd_pcm_oss_proc_free_setup_list(pstr);
3083 }
3084 }
3085 #else /* !CONFIG_SND_VERBOSE_PROCFS */
3086 #define snd_pcm_oss_proc_init(pcm)
3087 #define snd_pcm_oss_proc_done(pcm)
3088 #endif /* CONFIG_SND_VERBOSE_PROCFS */
3089
3090 /*
3091 * ENTRY functions
3092 */
3093
3094 static const struct file_operations snd_pcm_oss_f_reg =
3095 {
3096 .owner = THIS_MODULE,
3097 .read = snd_pcm_oss_read,
3098 .write = snd_pcm_oss_write,
3099 .open = snd_pcm_oss_open,
3100 .release = snd_pcm_oss_release,
3101 .llseek = no_llseek,
3102 .poll = snd_pcm_oss_poll,
3103 .unlocked_ioctl = snd_pcm_oss_ioctl,
3104 .compat_ioctl = snd_pcm_oss_ioctl_compat,
3105 .mmap = snd_pcm_oss_mmap,
3106 };
3107
register_oss_dsp(struct snd_pcm * pcm,int index)3108 static void register_oss_dsp(struct snd_pcm *pcm, int index)
3109 {
3110 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3111 pcm->card, index, &snd_pcm_oss_f_reg,
3112 pcm) < 0) {
3113 pcm_err(pcm, "unable to register OSS PCM device %i:%i\n",
3114 pcm->card->number, pcm->device);
3115 }
3116 }
3117
snd_pcm_oss_register_minor(struct snd_pcm * pcm)3118 static int snd_pcm_oss_register_minor(struct snd_pcm *pcm)
3119 {
3120 pcm->oss.reg = 0;
3121 if (dsp_map[pcm->card->number] == (int)pcm->device) {
3122 char name[128];
3123 int duplex;
3124 register_oss_dsp(pcm, 0);
3125 duplex = (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count > 0 &&
3126 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count &&
3127 !(pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX));
3128 sprintf(name, "%s%s", pcm->name, duplex ? " (DUPLEX)" : "");
3129 #ifdef SNDRV_OSS_INFO_DEV_AUDIO
3130 snd_oss_info_register(SNDRV_OSS_INFO_DEV_AUDIO,
3131 pcm->card->number,
3132 name);
3133 #endif
3134 pcm->oss.reg++;
3135 pcm->oss.reg_mask |= 1;
3136 }
3137 if (adsp_map[pcm->card->number] == (int)pcm->device) {
3138 register_oss_dsp(pcm, 1);
3139 pcm->oss.reg++;
3140 pcm->oss.reg_mask |= 2;
3141 }
3142
3143 if (pcm->oss.reg)
3144 snd_pcm_oss_proc_init(pcm);
3145
3146 return 0;
3147 }
3148
snd_pcm_oss_disconnect_minor(struct snd_pcm * pcm)3149 static int snd_pcm_oss_disconnect_minor(struct snd_pcm *pcm)
3150 {
3151 if (pcm->oss.reg) {
3152 if (pcm->oss.reg_mask & 1) {
3153 pcm->oss.reg_mask &= ~1;
3154 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3155 pcm->card, 0);
3156 }
3157 if (pcm->oss.reg_mask & 2) {
3158 pcm->oss.reg_mask &= ~2;
3159 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3160 pcm->card, 1);
3161 }
3162 if (dsp_map[pcm->card->number] == (int)pcm->device) {
3163 #ifdef SNDRV_OSS_INFO_DEV_AUDIO
3164 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_AUDIO, pcm->card->number);
3165 #endif
3166 }
3167 pcm->oss.reg = 0;
3168 }
3169 return 0;
3170 }
3171
snd_pcm_oss_unregister_minor(struct snd_pcm * pcm)3172 static int snd_pcm_oss_unregister_minor(struct snd_pcm *pcm)
3173 {
3174 snd_pcm_oss_disconnect_minor(pcm);
3175 snd_pcm_oss_proc_done(pcm);
3176 return 0;
3177 }
3178
3179 static struct snd_pcm_notify snd_pcm_oss_notify =
3180 {
3181 .n_register = snd_pcm_oss_register_minor,
3182 .n_disconnect = snd_pcm_oss_disconnect_minor,
3183 .n_unregister = snd_pcm_oss_unregister_minor,
3184 };
3185
alsa_pcm_oss_init(void)3186 static int __init alsa_pcm_oss_init(void)
3187 {
3188 int i;
3189 int err;
3190
3191 /* check device map table */
3192 for (i = 0; i < SNDRV_CARDS; i++) {
3193 if (dsp_map[i] < 0 || dsp_map[i] >= SNDRV_PCM_DEVICES) {
3194 pr_err("ALSA: pcm_oss: invalid dsp_map[%d] = %d\n",
3195 i, dsp_map[i]);
3196 dsp_map[i] = 0;
3197 }
3198 if (adsp_map[i] < 0 || adsp_map[i] >= SNDRV_PCM_DEVICES) {
3199 pr_err("ALSA: pcm_oss: invalid adsp_map[%d] = %d\n",
3200 i, adsp_map[i]);
3201 adsp_map[i] = 1;
3202 }
3203 }
3204 if ((err = snd_pcm_notify(&snd_pcm_oss_notify, 0)) < 0)
3205 return err;
3206 return 0;
3207 }
3208
alsa_pcm_oss_exit(void)3209 static void __exit alsa_pcm_oss_exit(void)
3210 {
3211 snd_pcm_notify(&snd_pcm_oss_notify, 1);
3212 }
3213
3214 module_init(alsa_pcm_oss_init)
3215 module_exit(alsa_pcm_oss_exit)
3216