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
778 /* don't allocate too large period; 1MB period must be enough */
779 if (oss_period_size > 1024 * 1024)
780 return -ENOMEM;
781
782 runtime->oss.period_bytes = oss_period_size;
783 runtime->oss.period_frames = 1;
784 runtime->oss.periods = oss_periods;
785 return 0;
786 }
787
choose_rate(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,unsigned int best_rate)788 static int choose_rate(struct snd_pcm_substream *substream,
789 struct snd_pcm_hw_params *params, unsigned int best_rate)
790 {
791 const struct snd_interval *it;
792 struct snd_pcm_hw_params *save;
793 unsigned int rate, prev;
794
795 save = kmalloc(sizeof(*save), GFP_KERNEL);
796 if (save == NULL)
797 return -ENOMEM;
798 *save = *params;
799 it = hw_param_interval_c(save, SNDRV_PCM_HW_PARAM_RATE);
800
801 /* try multiples of the best rate */
802 rate = best_rate;
803 for (;;) {
804 if (it->max < rate || (it->max == rate && it->openmax))
805 break;
806 if (it->min < rate || (it->min == rate && !it->openmin)) {
807 int ret;
808 ret = snd_pcm_hw_param_set(substream, params,
809 SNDRV_PCM_HW_PARAM_RATE,
810 rate, 0);
811 if (ret == (int)rate) {
812 kfree(save);
813 return rate;
814 }
815 *params = *save;
816 }
817 prev = rate;
818 rate += best_rate;
819 if (rate <= prev)
820 break;
821 }
822
823 /* not found, use the nearest rate */
824 kfree(save);
825 return snd_pcm_hw_param_near(substream, params, SNDRV_PCM_HW_PARAM_RATE, best_rate, NULL);
826 }
827
828 /* parameter locking: returns immediately if tried during streaming */
lock_params(struct snd_pcm_runtime * runtime)829 static int lock_params(struct snd_pcm_runtime *runtime)
830 {
831 if (mutex_lock_interruptible(&runtime->oss.params_lock))
832 return -ERESTARTSYS;
833 if (atomic_read(&runtime->oss.rw_ref)) {
834 mutex_unlock(&runtime->oss.params_lock);
835 return -EBUSY;
836 }
837 return 0;
838 }
839
unlock_params(struct snd_pcm_runtime * runtime)840 static void unlock_params(struct snd_pcm_runtime *runtime)
841 {
842 mutex_unlock(&runtime->oss.params_lock);
843 }
844
845 /* call with params_lock held */
snd_pcm_oss_change_params_locked(struct snd_pcm_substream * substream)846 static int snd_pcm_oss_change_params_locked(struct snd_pcm_substream *substream)
847 {
848 struct snd_pcm_runtime *runtime = substream->runtime;
849 struct snd_pcm_hw_params *params, *sparams;
850 struct snd_pcm_sw_params *sw_params;
851 ssize_t oss_buffer_size, oss_period_size;
852 size_t oss_frame_size;
853 int err;
854 int direct;
855 snd_pcm_format_t format, sformat;
856 int n;
857 const struct snd_mask *sformat_mask;
858 struct snd_mask mask;
859
860 if (!runtime->oss.params)
861 return 0;
862 sw_params = kzalloc(sizeof(*sw_params), GFP_KERNEL);
863 params = kmalloc(sizeof(*params), GFP_KERNEL);
864 sparams = kmalloc(sizeof(*sparams), GFP_KERNEL);
865 if (!sw_params || !params || !sparams) {
866 err = -ENOMEM;
867 goto failure;
868 }
869
870 if (atomic_read(&substream->mmap_count))
871 direct = 1;
872 else
873 direct = substream->oss.setup.direct;
874
875 _snd_pcm_hw_params_any(sparams);
876 _snd_pcm_hw_param_setinteger(sparams, SNDRV_PCM_HW_PARAM_PERIODS);
877 _snd_pcm_hw_param_min(sparams, SNDRV_PCM_HW_PARAM_PERIODS, 2, 0);
878 snd_mask_none(&mask);
879 if (atomic_read(&substream->mmap_count))
880 snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
881 else {
882 snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED);
883 if (!direct)
884 snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
885 }
886 err = snd_pcm_hw_param_mask(substream, sparams, SNDRV_PCM_HW_PARAM_ACCESS, &mask);
887 if (err < 0) {
888 pcm_dbg(substream->pcm, "No usable accesses\n");
889 err = -EINVAL;
890 goto failure;
891 }
892
893 err = choose_rate(substream, sparams, runtime->oss.rate);
894 if (err < 0)
895 goto failure;
896 err = snd_pcm_hw_param_near(substream, sparams,
897 SNDRV_PCM_HW_PARAM_CHANNELS,
898 runtime->oss.channels, NULL);
899 if (err < 0)
900 goto failure;
901
902 format = snd_pcm_oss_format_from(runtime->oss.format);
903
904 sformat_mask = hw_param_mask_c(sparams, SNDRV_PCM_HW_PARAM_FORMAT);
905 if (direct)
906 sformat = format;
907 else
908 sformat = snd_pcm_plug_slave_format(format, sformat_mask);
909
910 if ((__force int)sformat < 0 ||
911 !snd_mask_test_format(sformat_mask, sformat)) {
912 pcm_for_each_format(sformat) {
913 if (snd_mask_test_format(sformat_mask, sformat) &&
914 snd_pcm_oss_format_to(sformat) >= 0)
915 goto format_found;
916 }
917 pcm_dbg(substream->pcm, "Cannot find a format!!!\n");
918 err = -EINVAL;
919 goto failure;
920 }
921 format_found:
922 err = _snd_pcm_hw_param_set(sparams, SNDRV_PCM_HW_PARAM_FORMAT, (__force int)sformat, 0);
923 if (err < 0)
924 goto failure;
925
926 if (direct) {
927 memcpy(params, sparams, sizeof(*params));
928 } else {
929 _snd_pcm_hw_params_any(params);
930 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_ACCESS,
931 (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED, 0);
932 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_FORMAT,
933 (__force int)snd_pcm_oss_format_from(runtime->oss.format), 0);
934 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_CHANNELS,
935 runtime->oss.channels, 0);
936 _snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_RATE,
937 runtime->oss.rate, 0);
938 pdprintf("client: access = %i, format = %i, channels = %i, rate = %i\n",
939 params_access(params), params_format(params),
940 params_channels(params), params_rate(params));
941 }
942 pdprintf("slave: access = %i, format = %i, channels = %i, rate = %i\n",
943 params_access(sparams), params_format(sparams),
944 params_channels(sparams), params_rate(sparams));
945
946 oss_frame_size = snd_pcm_format_physical_width(params_format(params)) *
947 params_channels(params) / 8;
948
949 err = snd_pcm_oss_period_size(substream, params, sparams);
950 if (err < 0)
951 goto failure;
952
953 n = snd_pcm_plug_slave_size(substream, runtime->oss.period_bytes / oss_frame_size);
954 err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, n, NULL);
955 if (err < 0)
956 goto failure;
957
958 err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIODS,
959 runtime->oss.periods, NULL);
960 if (err < 0)
961 goto failure;
962
963 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
964
965 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_HW_PARAMS, sparams);
966 if (err < 0) {
967 pcm_dbg(substream->pcm, "HW_PARAMS failed: %i\n", err);
968 goto failure;
969 }
970
971 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
972 snd_pcm_oss_plugin_clear(substream);
973 if (!direct) {
974 /* add necessary plugins */
975 snd_pcm_oss_plugin_clear(substream);
976 if ((err = snd_pcm_plug_format_plugins(substream,
977 params,
978 sparams)) < 0) {
979 pcm_dbg(substream->pcm,
980 "snd_pcm_plug_format_plugins failed: %i\n", err);
981 snd_pcm_oss_plugin_clear(substream);
982 goto failure;
983 }
984 if (runtime->oss.plugin_first) {
985 struct snd_pcm_plugin *plugin;
986 if ((err = snd_pcm_plugin_build_io(substream, sparams, &plugin)) < 0) {
987 pcm_dbg(substream->pcm,
988 "snd_pcm_plugin_build_io failed: %i\n", err);
989 snd_pcm_oss_plugin_clear(substream);
990 goto failure;
991 }
992 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
993 err = snd_pcm_plugin_append(plugin);
994 } else {
995 err = snd_pcm_plugin_insert(plugin);
996 }
997 if (err < 0) {
998 snd_pcm_oss_plugin_clear(substream);
999 goto failure;
1000 }
1001 }
1002 }
1003 #endif
1004
1005 if (runtime->oss.trigger) {
1006 sw_params->start_threshold = 1;
1007 } else {
1008 sw_params->start_threshold = runtime->boundary;
1009 }
1010 if (atomic_read(&substream->mmap_count) ||
1011 substream->stream == SNDRV_PCM_STREAM_CAPTURE)
1012 sw_params->stop_threshold = runtime->boundary;
1013 else
1014 sw_params->stop_threshold = runtime->buffer_size;
1015 sw_params->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
1016 sw_params->period_step = 1;
1017 sw_params->avail_min = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
1018 1 : runtime->period_size;
1019 if (atomic_read(&substream->mmap_count) ||
1020 substream->oss.setup.nosilence) {
1021 sw_params->silence_threshold = 0;
1022 sw_params->silence_size = 0;
1023 } else {
1024 snd_pcm_uframes_t frames;
1025 frames = runtime->period_size + 16;
1026 if (frames > runtime->buffer_size)
1027 frames = runtime->buffer_size;
1028 sw_params->silence_threshold = frames;
1029 sw_params->silence_size = frames;
1030 }
1031
1032 if ((err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_SW_PARAMS, sw_params)) < 0) {
1033 pcm_dbg(substream->pcm, "SW_PARAMS failed: %i\n", err);
1034 goto failure;
1035 }
1036
1037 runtime->oss.periods = params_periods(sparams);
1038 oss_period_size = snd_pcm_plug_client_size(substream, params_period_size(sparams));
1039 if (oss_period_size < 0) {
1040 err = -EINVAL;
1041 goto failure;
1042 }
1043 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1044 if (runtime->oss.plugin_first) {
1045 err = snd_pcm_plug_alloc(substream, oss_period_size);
1046 if (err < 0)
1047 goto failure;
1048 }
1049 #endif
1050 oss_period_size = array_size(oss_period_size, oss_frame_size);
1051 oss_buffer_size = array_size(oss_period_size, runtime->oss.periods);
1052 if (oss_buffer_size <= 0) {
1053 err = -EINVAL;
1054 goto failure;
1055 }
1056
1057 runtime->oss.period_bytes = oss_period_size;
1058 runtime->oss.buffer_bytes = oss_buffer_size;
1059
1060 pdprintf("oss: period bytes = %i, buffer bytes = %i\n",
1061 runtime->oss.period_bytes,
1062 runtime->oss.buffer_bytes);
1063 pdprintf("slave: period_size = %i, buffer_size = %i\n",
1064 params_period_size(sparams),
1065 params_buffer_size(sparams));
1066
1067 runtime->oss.format = snd_pcm_oss_format_to(params_format(params));
1068 runtime->oss.channels = params_channels(params);
1069 runtime->oss.rate = params_rate(params);
1070
1071 kvfree(runtime->oss.buffer);
1072 runtime->oss.buffer = kvzalloc(runtime->oss.period_bytes, GFP_KERNEL);
1073 if (!runtime->oss.buffer) {
1074 err = -ENOMEM;
1075 goto failure;
1076 }
1077
1078 runtime->oss.params = 0;
1079 runtime->oss.prepare = 1;
1080 runtime->oss.buffer_used = 0;
1081 if (runtime->dma_area)
1082 snd_pcm_format_set_silence(runtime->format, runtime->dma_area, bytes_to_samples(runtime, runtime->dma_bytes));
1083
1084 runtime->oss.period_frames = snd_pcm_alsa_frames(substream, oss_period_size);
1085
1086 err = 0;
1087 failure:
1088 kfree(sw_params);
1089 kfree(params);
1090 kfree(sparams);
1091 return err;
1092 }
1093
1094 /* this one takes the lock by itself */
snd_pcm_oss_change_params(struct snd_pcm_substream * substream,bool trylock)1095 static int snd_pcm_oss_change_params(struct snd_pcm_substream *substream,
1096 bool trylock)
1097 {
1098 struct snd_pcm_runtime *runtime = substream->runtime;
1099 int err;
1100
1101 if (trylock) {
1102 if (!(mutex_trylock(&runtime->oss.params_lock)))
1103 return -EAGAIN;
1104 } else if (mutex_lock_interruptible(&runtime->oss.params_lock))
1105 return -ERESTARTSYS;
1106
1107 err = snd_pcm_oss_change_params_locked(substream);
1108 mutex_unlock(&runtime->oss.params_lock);
1109 return err;
1110 }
1111
snd_pcm_oss_get_active_substream(struct snd_pcm_oss_file * pcm_oss_file,struct snd_pcm_substream ** r_substream)1112 static int snd_pcm_oss_get_active_substream(struct snd_pcm_oss_file *pcm_oss_file, struct snd_pcm_substream **r_substream)
1113 {
1114 int idx, err;
1115 struct snd_pcm_substream *asubstream = NULL, *substream;
1116
1117 for (idx = 0; idx < 2; idx++) {
1118 substream = pcm_oss_file->streams[idx];
1119 if (substream == NULL)
1120 continue;
1121 if (asubstream == NULL)
1122 asubstream = substream;
1123 if (substream->runtime->oss.params) {
1124 err = snd_pcm_oss_change_params(substream, false);
1125 if (err < 0)
1126 return err;
1127 }
1128 }
1129 if (!asubstream)
1130 return -EIO;
1131 if (r_substream)
1132 *r_substream = asubstream;
1133 return 0;
1134 }
1135
1136 /* call with params_lock held */
1137 /* NOTE: this always call PREPARE unconditionally no matter whether
1138 * runtime->oss.prepare is set or not
1139 */
snd_pcm_oss_prepare(struct snd_pcm_substream * substream)1140 static int snd_pcm_oss_prepare(struct snd_pcm_substream *substream)
1141 {
1142 int err;
1143 struct snd_pcm_runtime *runtime = substream->runtime;
1144
1145 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PREPARE, NULL);
1146 if (err < 0) {
1147 pcm_dbg(substream->pcm,
1148 "snd_pcm_oss_prepare: SNDRV_PCM_IOCTL_PREPARE failed\n");
1149 return err;
1150 }
1151 runtime->oss.prepare = 0;
1152 runtime->oss.prev_hw_ptr_period = 0;
1153 runtime->oss.period_ptr = 0;
1154 runtime->oss.buffer_used = 0;
1155
1156 return 0;
1157 }
1158
snd_pcm_oss_make_ready(struct snd_pcm_substream * substream)1159 static int snd_pcm_oss_make_ready(struct snd_pcm_substream *substream)
1160 {
1161 struct snd_pcm_runtime *runtime;
1162 int err;
1163
1164 runtime = substream->runtime;
1165 if (runtime->oss.params) {
1166 err = snd_pcm_oss_change_params(substream, false);
1167 if (err < 0)
1168 return err;
1169 }
1170 if (runtime->oss.prepare) {
1171 if (mutex_lock_interruptible(&runtime->oss.params_lock))
1172 return -ERESTARTSYS;
1173 err = snd_pcm_oss_prepare(substream);
1174 mutex_unlock(&runtime->oss.params_lock);
1175 if (err < 0)
1176 return err;
1177 }
1178 return 0;
1179 }
1180
1181 /* call with params_lock held */
snd_pcm_oss_make_ready_locked(struct snd_pcm_substream * substream)1182 static int snd_pcm_oss_make_ready_locked(struct snd_pcm_substream *substream)
1183 {
1184 struct snd_pcm_runtime *runtime;
1185 int err;
1186
1187 runtime = substream->runtime;
1188 if (runtime->oss.params) {
1189 err = snd_pcm_oss_change_params_locked(substream);
1190 if (err < 0)
1191 return err;
1192 }
1193 if (runtime->oss.prepare) {
1194 err = snd_pcm_oss_prepare(substream);
1195 if (err < 0)
1196 return err;
1197 }
1198 return 0;
1199 }
1200
snd_pcm_oss_capture_position_fixup(struct snd_pcm_substream * substream,snd_pcm_sframes_t * delay)1201 static int snd_pcm_oss_capture_position_fixup(struct snd_pcm_substream *substream, snd_pcm_sframes_t *delay)
1202 {
1203 struct snd_pcm_runtime *runtime;
1204 snd_pcm_uframes_t frames;
1205 int err = 0;
1206
1207 while (1) {
1208 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, delay);
1209 if (err < 0)
1210 break;
1211 runtime = substream->runtime;
1212 if (*delay <= (snd_pcm_sframes_t)runtime->buffer_size)
1213 break;
1214 /* in case of overrun, skip whole periods like OSS/Linux driver does */
1215 /* until avail(delay) <= buffer_size */
1216 frames = (*delay - runtime->buffer_size) + runtime->period_size - 1;
1217 frames /= runtime->period_size;
1218 frames *= runtime->period_size;
1219 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_FORWARD, &frames);
1220 if (err < 0)
1221 break;
1222 }
1223 return err;
1224 }
1225
snd_pcm_oss_write3(struct snd_pcm_substream * substream,const char * ptr,snd_pcm_uframes_t frames,int in_kernel)1226 snd_pcm_sframes_t snd_pcm_oss_write3(struct snd_pcm_substream *substream, const char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1227 {
1228 struct snd_pcm_runtime *runtime = substream->runtime;
1229 int ret;
1230 while (1) {
1231 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1232 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1233 #ifdef OSS_DEBUG
1234 pcm_dbg(substream->pcm,
1235 "pcm_oss: write: recovering from %s\n",
1236 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1237 "XRUN" : "SUSPEND");
1238 #endif
1239 ret = snd_pcm_oss_prepare(substream);
1240 if (ret < 0)
1241 break;
1242 }
1243 mutex_unlock(&runtime->oss.params_lock);
1244 ret = __snd_pcm_lib_xfer(substream, (void *)ptr, true,
1245 frames, in_kernel);
1246 mutex_lock(&runtime->oss.params_lock);
1247 if (ret != -EPIPE && ret != -ESTRPIPE)
1248 break;
1249 /* test, if we can't store new data, because the stream */
1250 /* has not been started */
1251 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED)
1252 return -EAGAIN;
1253 }
1254 return ret;
1255 }
1256
snd_pcm_oss_read3(struct snd_pcm_substream * substream,char * ptr,snd_pcm_uframes_t frames,int in_kernel)1257 snd_pcm_sframes_t snd_pcm_oss_read3(struct snd_pcm_substream *substream, char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1258 {
1259 struct snd_pcm_runtime *runtime = substream->runtime;
1260 snd_pcm_sframes_t delay;
1261 int ret;
1262 while (1) {
1263 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1264 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1265 #ifdef OSS_DEBUG
1266 pcm_dbg(substream->pcm,
1267 "pcm_oss: read: recovering from %s\n",
1268 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1269 "XRUN" : "SUSPEND");
1270 #endif
1271 ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1272 if (ret < 0)
1273 break;
1274 } else if (runtime->status->state == SNDRV_PCM_STATE_SETUP) {
1275 ret = snd_pcm_oss_prepare(substream);
1276 if (ret < 0)
1277 break;
1278 }
1279 ret = snd_pcm_oss_capture_position_fixup(substream, &delay);
1280 if (ret < 0)
1281 break;
1282 mutex_unlock(&runtime->oss.params_lock);
1283 ret = __snd_pcm_lib_xfer(substream, (void *)ptr, true,
1284 frames, in_kernel);
1285 mutex_lock(&runtime->oss.params_lock);
1286 if (ret == -EPIPE) {
1287 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1288 ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1289 if (ret < 0)
1290 break;
1291 }
1292 continue;
1293 }
1294 if (ret != -ESTRPIPE)
1295 break;
1296 }
1297 return ret;
1298 }
1299
1300 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
snd_pcm_oss_writev3(struct snd_pcm_substream * substream,void ** bufs,snd_pcm_uframes_t frames)1301 snd_pcm_sframes_t snd_pcm_oss_writev3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames)
1302 {
1303 struct snd_pcm_runtime *runtime = substream->runtime;
1304 int ret;
1305 while (1) {
1306 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1307 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1308 #ifdef OSS_DEBUG
1309 pcm_dbg(substream->pcm,
1310 "pcm_oss: writev: recovering from %s\n",
1311 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1312 "XRUN" : "SUSPEND");
1313 #endif
1314 ret = snd_pcm_oss_prepare(substream);
1315 if (ret < 0)
1316 break;
1317 }
1318 ret = snd_pcm_kernel_writev(substream, bufs, frames);
1319 if (ret != -EPIPE && ret != -ESTRPIPE)
1320 break;
1321
1322 /* test, if we can't store new data, because the stream */
1323 /* has not been started */
1324 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED)
1325 return -EAGAIN;
1326 }
1327 return ret;
1328 }
1329
snd_pcm_oss_readv3(struct snd_pcm_substream * substream,void ** bufs,snd_pcm_uframes_t frames)1330 snd_pcm_sframes_t snd_pcm_oss_readv3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames)
1331 {
1332 struct snd_pcm_runtime *runtime = substream->runtime;
1333 int ret;
1334 while (1) {
1335 if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
1336 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1337 #ifdef OSS_DEBUG
1338 pcm_dbg(substream->pcm,
1339 "pcm_oss: readv: recovering from %s\n",
1340 runtime->status->state == SNDRV_PCM_STATE_XRUN ?
1341 "XRUN" : "SUSPEND");
1342 #endif
1343 ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1344 if (ret < 0)
1345 break;
1346 } else if (runtime->status->state == SNDRV_PCM_STATE_SETUP) {
1347 ret = snd_pcm_oss_prepare(substream);
1348 if (ret < 0)
1349 break;
1350 }
1351 ret = snd_pcm_kernel_readv(substream, bufs, frames);
1352 if (ret != -EPIPE && ret != -ESTRPIPE)
1353 break;
1354 }
1355 return ret;
1356 }
1357 #endif /* CONFIG_SND_PCM_OSS_PLUGINS */
1358
snd_pcm_oss_write2(struct snd_pcm_substream * substream,const char * buf,size_t bytes,int in_kernel)1359 static ssize_t snd_pcm_oss_write2(struct snd_pcm_substream *substream, const char *buf, size_t bytes, int in_kernel)
1360 {
1361 struct snd_pcm_runtime *runtime = substream->runtime;
1362 snd_pcm_sframes_t frames, frames1;
1363 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1364 if (runtime->oss.plugin_first) {
1365 struct snd_pcm_plugin_channel *channels;
1366 size_t oss_frame_bytes = (runtime->oss.plugin_first->src_width * runtime->oss.plugin_first->src_format.channels) / 8;
1367 if (!in_kernel) {
1368 if (copy_from_user(runtime->oss.buffer, (const char __force __user *)buf, bytes))
1369 return -EFAULT;
1370 buf = runtime->oss.buffer;
1371 }
1372 frames = bytes / oss_frame_bytes;
1373 frames1 = snd_pcm_plug_client_channels_buf(substream, (char *)buf, frames, &channels);
1374 if (frames1 < 0)
1375 return frames1;
1376 frames1 = snd_pcm_plug_write_transfer(substream, channels, frames1);
1377 if (frames1 <= 0)
1378 return frames1;
1379 bytes = frames1 * oss_frame_bytes;
1380 } else
1381 #endif
1382 {
1383 frames = bytes_to_frames(runtime, bytes);
1384 frames1 = snd_pcm_oss_write3(substream, buf, frames, in_kernel);
1385 if (frames1 <= 0)
1386 return frames1;
1387 bytes = frames_to_bytes(runtime, frames1);
1388 }
1389 return bytes;
1390 }
1391
snd_pcm_oss_write1(struct snd_pcm_substream * substream,const char __user * buf,size_t bytes)1392 static ssize_t snd_pcm_oss_write1(struct snd_pcm_substream *substream, const char __user *buf, size_t bytes)
1393 {
1394 size_t xfer = 0;
1395 ssize_t tmp = 0;
1396 struct snd_pcm_runtime *runtime = substream->runtime;
1397
1398 if (atomic_read(&substream->mmap_count))
1399 return -ENXIO;
1400
1401 atomic_inc(&runtime->oss.rw_ref);
1402 while (bytes > 0) {
1403 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1404 tmp = -ERESTARTSYS;
1405 break;
1406 }
1407 tmp = snd_pcm_oss_make_ready_locked(substream);
1408 if (tmp < 0)
1409 goto err;
1410 if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1411 tmp = bytes;
1412 if (tmp + runtime->oss.buffer_used > runtime->oss.period_bytes)
1413 tmp = runtime->oss.period_bytes - runtime->oss.buffer_used;
1414 if (tmp > 0) {
1415 if (copy_from_user(runtime->oss.buffer + runtime->oss.buffer_used, buf, tmp)) {
1416 tmp = -EFAULT;
1417 goto err;
1418 }
1419 }
1420 runtime->oss.buffer_used += tmp;
1421 buf += tmp;
1422 bytes -= tmp;
1423 xfer += tmp;
1424 if (substream->oss.setup.partialfrag ||
1425 runtime->oss.buffer_used == runtime->oss.period_bytes) {
1426 tmp = snd_pcm_oss_write2(substream, runtime->oss.buffer + runtime->oss.period_ptr,
1427 runtime->oss.buffer_used - runtime->oss.period_ptr, 1);
1428 if (tmp <= 0)
1429 goto err;
1430 runtime->oss.bytes += tmp;
1431 runtime->oss.period_ptr += tmp;
1432 runtime->oss.period_ptr %= runtime->oss.period_bytes;
1433 if (runtime->oss.period_ptr == 0 ||
1434 runtime->oss.period_ptr == runtime->oss.buffer_used)
1435 runtime->oss.buffer_used = 0;
1436 else if ((substream->f_flags & O_NONBLOCK) != 0) {
1437 tmp = -EAGAIN;
1438 goto err;
1439 }
1440 }
1441 } else {
1442 tmp = snd_pcm_oss_write2(substream,
1443 (const char __force *)buf,
1444 runtime->oss.period_bytes, 0);
1445 if (tmp <= 0)
1446 goto err;
1447 runtime->oss.bytes += tmp;
1448 buf += tmp;
1449 bytes -= tmp;
1450 xfer += tmp;
1451 if ((substream->f_flags & O_NONBLOCK) != 0 &&
1452 tmp != runtime->oss.period_bytes)
1453 tmp = -EAGAIN;
1454 }
1455 err:
1456 mutex_unlock(&runtime->oss.params_lock);
1457 if (tmp < 0)
1458 break;
1459 if (signal_pending(current)) {
1460 tmp = -ERESTARTSYS;
1461 break;
1462 }
1463 tmp = 0;
1464 }
1465 atomic_dec(&runtime->oss.rw_ref);
1466 return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1467 }
1468
snd_pcm_oss_read2(struct snd_pcm_substream * substream,char * buf,size_t bytes,int in_kernel)1469 static ssize_t snd_pcm_oss_read2(struct snd_pcm_substream *substream, char *buf, size_t bytes, int in_kernel)
1470 {
1471 struct snd_pcm_runtime *runtime = substream->runtime;
1472 snd_pcm_sframes_t frames, frames1;
1473 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1474 char __user *final_dst = (char __force __user *)buf;
1475 if (runtime->oss.plugin_first) {
1476 struct snd_pcm_plugin_channel *channels;
1477 size_t oss_frame_bytes = (runtime->oss.plugin_last->dst_width * runtime->oss.plugin_last->dst_format.channels) / 8;
1478 if (!in_kernel)
1479 buf = runtime->oss.buffer;
1480 frames = bytes / oss_frame_bytes;
1481 frames1 = snd_pcm_plug_client_channels_buf(substream, buf, frames, &channels);
1482 if (frames1 < 0)
1483 return frames1;
1484 frames1 = snd_pcm_plug_read_transfer(substream, channels, frames1);
1485 if (frames1 <= 0)
1486 return frames1;
1487 bytes = frames1 * oss_frame_bytes;
1488 if (!in_kernel && copy_to_user(final_dst, buf, bytes))
1489 return -EFAULT;
1490 } else
1491 #endif
1492 {
1493 frames = bytes_to_frames(runtime, bytes);
1494 frames1 = snd_pcm_oss_read3(substream, buf, frames, in_kernel);
1495 if (frames1 <= 0)
1496 return frames1;
1497 bytes = frames_to_bytes(runtime, frames1);
1498 }
1499 return bytes;
1500 }
1501
snd_pcm_oss_read1(struct snd_pcm_substream * substream,char __user * buf,size_t bytes)1502 static ssize_t snd_pcm_oss_read1(struct snd_pcm_substream *substream, char __user *buf, size_t bytes)
1503 {
1504 size_t xfer = 0;
1505 ssize_t tmp = 0;
1506 struct snd_pcm_runtime *runtime = substream->runtime;
1507
1508 if (atomic_read(&substream->mmap_count))
1509 return -ENXIO;
1510
1511 atomic_inc(&runtime->oss.rw_ref);
1512 while (bytes > 0) {
1513 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1514 tmp = -ERESTARTSYS;
1515 break;
1516 }
1517 tmp = snd_pcm_oss_make_ready_locked(substream);
1518 if (tmp < 0)
1519 goto err;
1520 if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1521 if (runtime->oss.buffer_used == 0) {
1522 tmp = snd_pcm_oss_read2(substream, runtime->oss.buffer, runtime->oss.period_bytes, 1);
1523 if (tmp <= 0)
1524 goto err;
1525 runtime->oss.bytes += tmp;
1526 runtime->oss.period_ptr = tmp;
1527 runtime->oss.buffer_used = tmp;
1528 }
1529 tmp = bytes;
1530 if ((size_t) tmp > runtime->oss.buffer_used)
1531 tmp = runtime->oss.buffer_used;
1532 if (copy_to_user(buf, runtime->oss.buffer + (runtime->oss.period_ptr - runtime->oss.buffer_used), tmp)) {
1533 tmp = -EFAULT;
1534 goto err;
1535 }
1536 buf += tmp;
1537 bytes -= tmp;
1538 xfer += tmp;
1539 runtime->oss.buffer_used -= tmp;
1540 } else {
1541 tmp = snd_pcm_oss_read2(substream, (char __force *)buf,
1542 runtime->oss.period_bytes, 0);
1543 if (tmp <= 0)
1544 goto err;
1545 runtime->oss.bytes += tmp;
1546 buf += tmp;
1547 bytes -= tmp;
1548 xfer += tmp;
1549 }
1550 err:
1551 mutex_unlock(&runtime->oss.params_lock);
1552 if (tmp < 0)
1553 break;
1554 if (signal_pending(current)) {
1555 tmp = -ERESTARTSYS;
1556 break;
1557 }
1558 tmp = 0;
1559 }
1560 atomic_dec(&runtime->oss.rw_ref);
1561 return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1562 }
1563
snd_pcm_oss_reset(struct snd_pcm_oss_file * pcm_oss_file)1564 static int snd_pcm_oss_reset(struct snd_pcm_oss_file *pcm_oss_file)
1565 {
1566 struct snd_pcm_substream *substream;
1567 struct snd_pcm_runtime *runtime;
1568 int i;
1569
1570 for (i = 0; i < 2; i++) {
1571 substream = pcm_oss_file->streams[i];
1572 if (!substream)
1573 continue;
1574 runtime = substream->runtime;
1575 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1576 mutex_lock(&runtime->oss.params_lock);
1577 runtime->oss.prepare = 1;
1578 runtime->oss.buffer_used = 0;
1579 runtime->oss.prev_hw_ptr_period = 0;
1580 runtime->oss.period_ptr = 0;
1581 mutex_unlock(&runtime->oss.params_lock);
1582 }
1583 return 0;
1584 }
1585
snd_pcm_oss_post(struct snd_pcm_oss_file * pcm_oss_file)1586 static int snd_pcm_oss_post(struct snd_pcm_oss_file *pcm_oss_file)
1587 {
1588 struct snd_pcm_substream *substream;
1589 int err;
1590
1591 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1592 if (substream != NULL) {
1593 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
1594 return err;
1595 snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_START, NULL);
1596 }
1597 /* note: all errors from the start action are ignored */
1598 /* OSS apps do not know, how to handle them */
1599 return 0;
1600 }
1601
snd_pcm_oss_sync1(struct snd_pcm_substream * substream,size_t size)1602 static int snd_pcm_oss_sync1(struct snd_pcm_substream *substream, size_t size)
1603 {
1604 struct snd_pcm_runtime *runtime;
1605 ssize_t result = 0;
1606 snd_pcm_state_t state;
1607 long res;
1608 wait_queue_entry_t wait;
1609
1610 runtime = substream->runtime;
1611 init_waitqueue_entry(&wait, current);
1612 add_wait_queue(&runtime->sleep, &wait);
1613 #ifdef OSS_DEBUG
1614 pcm_dbg(substream->pcm, "sync1: size = %li\n", size);
1615 #endif
1616 while (1) {
1617 result = snd_pcm_oss_write2(substream, runtime->oss.buffer, size, 1);
1618 if (result > 0) {
1619 runtime->oss.buffer_used = 0;
1620 result = 0;
1621 break;
1622 }
1623 if (result != 0 && result != -EAGAIN)
1624 break;
1625 result = 0;
1626 set_current_state(TASK_INTERRUPTIBLE);
1627 snd_pcm_stream_lock_irq(substream);
1628 state = runtime->status->state;
1629 snd_pcm_stream_unlock_irq(substream);
1630 if (state != SNDRV_PCM_STATE_RUNNING) {
1631 set_current_state(TASK_RUNNING);
1632 break;
1633 }
1634 res = schedule_timeout(10 * HZ);
1635 if (signal_pending(current)) {
1636 result = -ERESTARTSYS;
1637 break;
1638 }
1639 if (res == 0) {
1640 pcm_err(substream->pcm,
1641 "OSS sync error - DMA timeout\n");
1642 result = -EIO;
1643 break;
1644 }
1645 }
1646 remove_wait_queue(&runtime->sleep, &wait);
1647 return result;
1648 }
1649
snd_pcm_oss_sync(struct snd_pcm_oss_file * pcm_oss_file)1650 static int snd_pcm_oss_sync(struct snd_pcm_oss_file *pcm_oss_file)
1651 {
1652 int err = 0;
1653 unsigned int saved_f_flags;
1654 struct snd_pcm_substream *substream;
1655 struct snd_pcm_runtime *runtime;
1656 snd_pcm_format_t format;
1657 unsigned long width;
1658 size_t size;
1659
1660 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1661 if (substream != NULL) {
1662 runtime = substream->runtime;
1663 if (atomic_read(&substream->mmap_count))
1664 goto __direct;
1665 atomic_inc(&runtime->oss.rw_ref);
1666 if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1667 atomic_dec(&runtime->oss.rw_ref);
1668 return -ERESTARTSYS;
1669 }
1670 err = snd_pcm_oss_make_ready_locked(substream);
1671 if (err < 0)
1672 goto unlock;
1673 format = snd_pcm_oss_format_from(runtime->oss.format);
1674 width = snd_pcm_format_physical_width(format);
1675 if (runtime->oss.buffer_used > 0) {
1676 #ifdef OSS_DEBUG
1677 pcm_dbg(substream->pcm, "sync: buffer_used\n");
1678 #endif
1679 size = (8 * (runtime->oss.period_bytes - runtime->oss.buffer_used) + 7) / width;
1680 snd_pcm_format_set_silence(format,
1681 runtime->oss.buffer + runtime->oss.buffer_used,
1682 size);
1683 err = snd_pcm_oss_sync1(substream, runtime->oss.period_bytes);
1684 if (err < 0)
1685 goto unlock;
1686 } else if (runtime->oss.period_ptr > 0) {
1687 #ifdef OSS_DEBUG
1688 pcm_dbg(substream->pcm, "sync: period_ptr\n");
1689 #endif
1690 size = runtime->oss.period_bytes - runtime->oss.period_ptr;
1691 snd_pcm_format_set_silence(format,
1692 runtime->oss.buffer,
1693 size * 8 / width);
1694 err = snd_pcm_oss_sync1(substream, size);
1695 if (err < 0)
1696 goto unlock;
1697 }
1698 /*
1699 * The ALSA's period might be a bit large than OSS one.
1700 * Fill the remain portion of ALSA period with zeros.
1701 */
1702 size = runtime->control->appl_ptr % runtime->period_size;
1703 if (size > 0) {
1704 size = runtime->period_size - size;
1705 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED)
1706 snd_pcm_lib_write(substream, NULL, size);
1707 else if (runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
1708 snd_pcm_lib_writev(substream, NULL, size);
1709 }
1710 unlock:
1711 mutex_unlock(&runtime->oss.params_lock);
1712 atomic_dec(&runtime->oss.rw_ref);
1713 if (err < 0)
1714 return err;
1715 /*
1716 * finish sync: drain the buffer
1717 */
1718 __direct:
1719 saved_f_flags = substream->f_flags;
1720 substream->f_flags &= ~O_NONBLOCK;
1721 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1722 substream->f_flags = saved_f_flags;
1723 if (err < 0)
1724 return err;
1725 mutex_lock(&runtime->oss.params_lock);
1726 runtime->oss.prepare = 1;
1727 mutex_unlock(&runtime->oss.params_lock);
1728 }
1729
1730 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
1731 if (substream != NULL) {
1732 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
1733 return err;
1734 runtime = substream->runtime;
1735 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1736 if (err < 0)
1737 return err;
1738 mutex_lock(&runtime->oss.params_lock);
1739 runtime->oss.buffer_used = 0;
1740 runtime->oss.prepare = 1;
1741 mutex_unlock(&runtime->oss.params_lock);
1742 }
1743 return 0;
1744 }
1745
snd_pcm_oss_set_rate(struct snd_pcm_oss_file * pcm_oss_file,int rate)1746 static int snd_pcm_oss_set_rate(struct snd_pcm_oss_file *pcm_oss_file, int rate)
1747 {
1748 int idx;
1749
1750 for (idx = 1; idx >= 0; --idx) {
1751 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1752 struct snd_pcm_runtime *runtime;
1753 int err;
1754
1755 if (substream == NULL)
1756 continue;
1757 runtime = substream->runtime;
1758 if (rate < 1000)
1759 rate = 1000;
1760 else if (rate > 192000)
1761 rate = 192000;
1762 err = lock_params(runtime);
1763 if (err < 0)
1764 return err;
1765 if (runtime->oss.rate != rate) {
1766 runtime->oss.params = 1;
1767 runtime->oss.rate = rate;
1768 }
1769 unlock_params(runtime);
1770 }
1771 return snd_pcm_oss_get_rate(pcm_oss_file);
1772 }
1773
snd_pcm_oss_get_rate(struct snd_pcm_oss_file * pcm_oss_file)1774 static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file)
1775 {
1776 struct snd_pcm_substream *substream;
1777 int err;
1778
1779 if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1780 return err;
1781 return substream->runtime->oss.rate;
1782 }
1783
snd_pcm_oss_set_channels(struct snd_pcm_oss_file * pcm_oss_file,unsigned int channels)1784 static int snd_pcm_oss_set_channels(struct snd_pcm_oss_file *pcm_oss_file, unsigned int channels)
1785 {
1786 int idx;
1787 if (channels < 1)
1788 channels = 1;
1789 if (channels > 128)
1790 return -EINVAL;
1791 for (idx = 1; idx >= 0; --idx) {
1792 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1793 struct snd_pcm_runtime *runtime;
1794 int err;
1795
1796 if (substream == NULL)
1797 continue;
1798 runtime = substream->runtime;
1799 err = lock_params(runtime);
1800 if (err < 0)
1801 return err;
1802 if (runtime->oss.channels != channels) {
1803 runtime->oss.params = 1;
1804 runtime->oss.channels = channels;
1805 }
1806 unlock_params(runtime);
1807 }
1808 return snd_pcm_oss_get_channels(pcm_oss_file);
1809 }
1810
snd_pcm_oss_get_channels(struct snd_pcm_oss_file * pcm_oss_file)1811 static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file)
1812 {
1813 struct snd_pcm_substream *substream;
1814 int err;
1815
1816 if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1817 return err;
1818 return substream->runtime->oss.channels;
1819 }
1820
snd_pcm_oss_get_block_size(struct snd_pcm_oss_file * pcm_oss_file)1821 static int snd_pcm_oss_get_block_size(struct snd_pcm_oss_file *pcm_oss_file)
1822 {
1823 struct snd_pcm_substream *substream;
1824 int err;
1825
1826 if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1827 return err;
1828 return substream->runtime->oss.period_bytes;
1829 }
1830
snd_pcm_oss_get_formats(struct snd_pcm_oss_file * pcm_oss_file)1831 static int snd_pcm_oss_get_formats(struct snd_pcm_oss_file *pcm_oss_file)
1832 {
1833 struct snd_pcm_substream *substream;
1834 int err;
1835 int direct;
1836 struct snd_pcm_hw_params *params;
1837 unsigned int formats = 0;
1838 const struct snd_mask *format_mask;
1839 int fmt;
1840
1841 if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1842 return err;
1843 if (atomic_read(&substream->mmap_count))
1844 direct = 1;
1845 else
1846 direct = substream->oss.setup.direct;
1847 if (!direct)
1848 return AFMT_MU_LAW | AFMT_U8 |
1849 AFMT_S16_LE | AFMT_S16_BE |
1850 AFMT_S8 | AFMT_U16_LE |
1851 AFMT_U16_BE |
1852 AFMT_S32_LE | AFMT_S32_BE |
1853 AFMT_S24_LE | AFMT_S24_BE |
1854 AFMT_S24_PACKED;
1855 params = kmalloc(sizeof(*params), GFP_KERNEL);
1856 if (!params)
1857 return -ENOMEM;
1858 _snd_pcm_hw_params_any(params);
1859 err = snd_pcm_hw_refine(substream, params);
1860 if (err < 0)
1861 goto error;
1862 format_mask = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
1863 for (fmt = 0; fmt < 32; ++fmt) {
1864 if (snd_mask_test(format_mask, fmt)) {
1865 int f = snd_pcm_oss_format_to((__force snd_pcm_format_t)fmt);
1866 if (f >= 0)
1867 formats |= f;
1868 }
1869 }
1870
1871 error:
1872 kfree(params);
1873 return err < 0 ? err : formats;
1874 }
1875
snd_pcm_oss_set_format(struct snd_pcm_oss_file * pcm_oss_file,int format)1876 static int snd_pcm_oss_set_format(struct snd_pcm_oss_file *pcm_oss_file, int format)
1877 {
1878 int formats, idx;
1879 int err;
1880
1881 if (format != AFMT_QUERY) {
1882 formats = snd_pcm_oss_get_formats(pcm_oss_file);
1883 if (formats < 0)
1884 return formats;
1885 if (!(formats & format))
1886 format = AFMT_U8;
1887 for (idx = 1; idx >= 0; --idx) {
1888 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1889 struct snd_pcm_runtime *runtime;
1890 if (substream == NULL)
1891 continue;
1892 runtime = substream->runtime;
1893 err = lock_params(runtime);
1894 if (err < 0)
1895 return err;
1896 if (runtime->oss.format != format) {
1897 runtime->oss.params = 1;
1898 runtime->oss.format = format;
1899 }
1900 unlock_params(runtime);
1901 }
1902 }
1903 return snd_pcm_oss_get_format(pcm_oss_file);
1904 }
1905
snd_pcm_oss_get_format(struct snd_pcm_oss_file * pcm_oss_file)1906 static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file)
1907 {
1908 struct snd_pcm_substream *substream;
1909 int err;
1910
1911 if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
1912 return err;
1913 return substream->runtime->oss.format;
1914 }
1915
snd_pcm_oss_set_subdivide1(struct snd_pcm_substream * substream,int subdivide)1916 static int snd_pcm_oss_set_subdivide1(struct snd_pcm_substream *substream, int subdivide)
1917 {
1918 struct snd_pcm_runtime *runtime;
1919
1920 runtime = substream->runtime;
1921 if (subdivide == 0) {
1922 subdivide = runtime->oss.subdivision;
1923 if (subdivide == 0)
1924 subdivide = 1;
1925 return subdivide;
1926 }
1927 if (runtime->oss.subdivision || runtime->oss.fragshift)
1928 return -EINVAL;
1929 if (subdivide != 1 && subdivide != 2 && subdivide != 4 &&
1930 subdivide != 8 && subdivide != 16)
1931 return -EINVAL;
1932 runtime->oss.subdivision = subdivide;
1933 runtime->oss.params = 1;
1934 return subdivide;
1935 }
1936
snd_pcm_oss_set_subdivide(struct snd_pcm_oss_file * pcm_oss_file,int subdivide)1937 static int snd_pcm_oss_set_subdivide(struct snd_pcm_oss_file *pcm_oss_file, int subdivide)
1938 {
1939 int err = -EINVAL, idx;
1940
1941 for (idx = 1; idx >= 0; --idx) {
1942 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1943 struct snd_pcm_runtime *runtime;
1944
1945 if (substream == NULL)
1946 continue;
1947 runtime = substream->runtime;
1948 err = lock_params(runtime);
1949 if (err < 0)
1950 return err;
1951 err = snd_pcm_oss_set_subdivide1(substream, subdivide);
1952 unlock_params(runtime);
1953 if (err < 0)
1954 return err;
1955 }
1956 return err;
1957 }
1958
snd_pcm_oss_set_fragment1(struct snd_pcm_substream * substream,unsigned int val)1959 static int snd_pcm_oss_set_fragment1(struct snd_pcm_substream *substream, unsigned int val)
1960 {
1961 struct snd_pcm_runtime *runtime;
1962 int fragshift;
1963
1964 runtime = substream->runtime;
1965 if (runtime->oss.subdivision || runtime->oss.fragshift)
1966 return -EINVAL;
1967 fragshift = val & 0xffff;
1968 if (fragshift >= 25) /* should be large enough */
1969 return -EINVAL;
1970 runtime->oss.fragshift = fragshift;
1971 runtime->oss.maxfrags = (val >> 16) & 0xffff;
1972 if (runtime->oss.fragshift < 4) /* < 16 */
1973 runtime->oss.fragshift = 4;
1974 if (runtime->oss.maxfrags < 2)
1975 runtime->oss.maxfrags = 2;
1976 runtime->oss.params = 1;
1977 return 0;
1978 }
1979
snd_pcm_oss_set_fragment(struct snd_pcm_oss_file * pcm_oss_file,unsigned int val)1980 static int snd_pcm_oss_set_fragment(struct snd_pcm_oss_file *pcm_oss_file, unsigned int val)
1981 {
1982 int err = -EINVAL, idx;
1983
1984 for (idx = 1; idx >= 0; --idx) {
1985 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1986 struct snd_pcm_runtime *runtime;
1987
1988 if (substream == NULL)
1989 continue;
1990 runtime = substream->runtime;
1991 err = lock_params(runtime);
1992 if (err < 0)
1993 return err;
1994 err = snd_pcm_oss_set_fragment1(substream, val);
1995 unlock_params(runtime);
1996 if (err < 0)
1997 return err;
1998 }
1999 return err;
2000 }
2001
snd_pcm_oss_nonblock(struct file * file)2002 static int snd_pcm_oss_nonblock(struct file * file)
2003 {
2004 spin_lock(&file->f_lock);
2005 file->f_flags |= O_NONBLOCK;
2006 spin_unlock(&file->f_lock);
2007 return 0;
2008 }
2009
snd_pcm_oss_get_caps1(struct snd_pcm_substream * substream,int res)2010 static int snd_pcm_oss_get_caps1(struct snd_pcm_substream *substream, int res)
2011 {
2012
2013 if (substream == NULL) {
2014 res &= ~DSP_CAP_DUPLEX;
2015 return res;
2016 }
2017 #ifdef DSP_CAP_MULTI
2018 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2019 if (substream->pstr->substream_count > 1)
2020 res |= DSP_CAP_MULTI;
2021 #endif
2022 /* DSP_CAP_REALTIME is set all times: */
2023 /* all ALSA drivers can return actual pointer in ring buffer */
2024 #if defined(DSP_CAP_REALTIME) && 0
2025 {
2026 struct snd_pcm_runtime *runtime = substream->runtime;
2027 if (runtime->info & (SNDRV_PCM_INFO_BLOCK_TRANSFER|SNDRV_PCM_INFO_BATCH))
2028 res &= ~DSP_CAP_REALTIME;
2029 }
2030 #endif
2031 return res;
2032 }
2033
snd_pcm_oss_get_caps(struct snd_pcm_oss_file * pcm_oss_file)2034 static int snd_pcm_oss_get_caps(struct snd_pcm_oss_file *pcm_oss_file)
2035 {
2036 int result, idx;
2037
2038 result = DSP_CAP_TRIGGER | DSP_CAP_MMAP | DSP_CAP_DUPLEX | DSP_CAP_REALTIME;
2039 for (idx = 0; idx < 2; idx++) {
2040 struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
2041 result = snd_pcm_oss_get_caps1(substream, result);
2042 }
2043 result |= 0x0001; /* revision - same as SB AWE 64 */
2044 return result;
2045 }
2046
snd_pcm_oss_simulate_fill(struct snd_pcm_substream * substream,snd_pcm_uframes_t hw_ptr)2047 static void snd_pcm_oss_simulate_fill(struct snd_pcm_substream *substream,
2048 snd_pcm_uframes_t hw_ptr)
2049 {
2050 struct snd_pcm_runtime *runtime = substream->runtime;
2051 snd_pcm_uframes_t appl_ptr;
2052 appl_ptr = hw_ptr + runtime->buffer_size;
2053 appl_ptr %= runtime->boundary;
2054 runtime->control->appl_ptr = appl_ptr;
2055 }
2056
snd_pcm_oss_set_trigger(struct snd_pcm_oss_file * pcm_oss_file,int trigger)2057 static int snd_pcm_oss_set_trigger(struct snd_pcm_oss_file *pcm_oss_file, int trigger)
2058 {
2059 struct snd_pcm_runtime *runtime;
2060 struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2061 int err, cmd;
2062
2063 #ifdef OSS_DEBUG
2064 pr_debug("pcm_oss: trigger = 0x%x\n", trigger);
2065 #endif
2066
2067 psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2068 csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2069
2070 if (psubstream) {
2071 if ((err = snd_pcm_oss_make_ready(psubstream)) < 0)
2072 return err;
2073 }
2074 if (csubstream) {
2075 if ((err = snd_pcm_oss_make_ready(csubstream)) < 0)
2076 return err;
2077 }
2078 if (psubstream) {
2079 runtime = psubstream->runtime;
2080 cmd = 0;
2081 if (mutex_lock_interruptible(&runtime->oss.params_lock))
2082 return -ERESTARTSYS;
2083 if (trigger & PCM_ENABLE_OUTPUT) {
2084 if (runtime->oss.trigger)
2085 goto _skip1;
2086 if (atomic_read(&psubstream->mmap_count))
2087 snd_pcm_oss_simulate_fill(psubstream,
2088 get_hw_ptr_period(runtime));
2089 runtime->oss.trigger = 1;
2090 runtime->start_threshold = 1;
2091 cmd = SNDRV_PCM_IOCTL_START;
2092 } else {
2093 if (!runtime->oss.trigger)
2094 goto _skip1;
2095 runtime->oss.trigger = 0;
2096 runtime->start_threshold = runtime->boundary;
2097 cmd = SNDRV_PCM_IOCTL_DROP;
2098 runtime->oss.prepare = 1;
2099 }
2100 _skip1:
2101 mutex_unlock(&runtime->oss.params_lock);
2102 if (cmd) {
2103 err = snd_pcm_kernel_ioctl(psubstream, cmd, NULL);
2104 if (err < 0)
2105 return err;
2106 }
2107 }
2108 if (csubstream) {
2109 runtime = csubstream->runtime;
2110 cmd = 0;
2111 if (mutex_lock_interruptible(&runtime->oss.params_lock))
2112 return -ERESTARTSYS;
2113 if (trigger & PCM_ENABLE_INPUT) {
2114 if (runtime->oss.trigger)
2115 goto _skip2;
2116 runtime->oss.trigger = 1;
2117 runtime->start_threshold = 1;
2118 cmd = SNDRV_PCM_IOCTL_START;
2119 } else {
2120 if (!runtime->oss.trigger)
2121 goto _skip2;
2122 runtime->oss.trigger = 0;
2123 runtime->start_threshold = runtime->boundary;
2124 cmd = SNDRV_PCM_IOCTL_DROP;
2125 runtime->oss.prepare = 1;
2126 }
2127 _skip2:
2128 mutex_unlock(&runtime->oss.params_lock);
2129 if (cmd) {
2130 err = snd_pcm_kernel_ioctl(csubstream, cmd, NULL);
2131 if (err < 0)
2132 return err;
2133 }
2134 }
2135 return 0;
2136 }
2137
snd_pcm_oss_get_trigger(struct snd_pcm_oss_file * pcm_oss_file)2138 static int snd_pcm_oss_get_trigger(struct snd_pcm_oss_file *pcm_oss_file)
2139 {
2140 struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2141 int result = 0;
2142
2143 psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2144 csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2145 if (psubstream && psubstream->runtime && psubstream->runtime->oss.trigger)
2146 result |= PCM_ENABLE_OUTPUT;
2147 if (csubstream && csubstream->runtime && csubstream->runtime->oss.trigger)
2148 result |= PCM_ENABLE_INPUT;
2149 return result;
2150 }
2151
snd_pcm_oss_get_odelay(struct snd_pcm_oss_file * pcm_oss_file)2152 static int snd_pcm_oss_get_odelay(struct snd_pcm_oss_file *pcm_oss_file)
2153 {
2154 struct snd_pcm_substream *substream;
2155 struct snd_pcm_runtime *runtime;
2156 snd_pcm_sframes_t delay;
2157 int err;
2158
2159 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2160 if (substream == NULL)
2161 return -EINVAL;
2162 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
2163 return err;
2164 runtime = substream->runtime;
2165 if (runtime->oss.params || runtime->oss.prepare)
2166 return 0;
2167 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
2168 if (err == -EPIPE)
2169 delay = 0; /* hack for broken OSS applications */
2170 else if (err < 0)
2171 return err;
2172 return snd_pcm_oss_bytes(substream, delay);
2173 }
2174
snd_pcm_oss_get_ptr(struct snd_pcm_oss_file * pcm_oss_file,int stream,struct count_info __user * _info)2175 static int snd_pcm_oss_get_ptr(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct count_info __user * _info)
2176 {
2177 struct snd_pcm_substream *substream;
2178 struct snd_pcm_runtime *runtime;
2179 snd_pcm_sframes_t delay;
2180 int fixup;
2181 struct count_info info;
2182 int err;
2183
2184 if (_info == NULL)
2185 return -EFAULT;
2186 substream = pcm_oss_file->streams[stream];
2187 if (substream == NULL)
2188 return -EINVAL;
2189 if ((err = snd_pcm_oss_make_ready(substream)) < 0)
2190 return err;
2191 runtime = substream->runtime;
2192 if (runtime->oss.params || runtime->oss.prepare) {
2193 memset(&info, 0, sizeof(info));
2194 if (copy_to_user(_info, &info, sizeof(info)))
2195 return -EFAULT;
2196 return 0;
2197 }
2198 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2199 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
2200 if (err == -EPIPE || err == -ESTRPIPE || (! err && delay < 0)) {
2201 err = 0;
2202 delay = 0;
2203 fixup = 0;
2204 } else {
2205 fixup = runtime->oss.buffer_used;
2206 }
2207 } else {
2208 err = snd_pcm_oss_capture_position_fixup(substream, &delay);
2209 fixup = -runtime->oss.buffer_used;
2210 }
2211 if (err < 0)
2212 return err;
2213 info.ptr = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr % runtime->buffer_size);
2214 if (atomic_read(&substream->mmap_count)) {
2215 snd_pcm_sframes_t n;
2216 delay = get_hw_ptr_period(runtime);
2217 n = delay - runtime->oss.prev_hw_ptr_period;
2218 if (n < 0)
2219 n += runtime->boundary;
2220 info.blocks = n / runtime->period_size;
2221 runtime->oss.prev_hw_ptr_period = delay;
2222 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2223 snd_pcm_oss_simulate_fill(substream, delay);
2224 info.bytes = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr) & INT_MAX;
2225 } else {
2226 delay = snd_pcm_oss_bytes(substream, delay);
2227 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2228 if (substream->oss.setup.buggyptr)
2229 info.blocks = (runtime->oss.buffer_bytes - delay - fixup) / runtime->oss.period_bytes;
2230 else
2231 info.blocks = (delay + fixup) / runtime->oss.period_bytes;
2232 info.bytes = (runtime->oss.bytes - delay) & INT_MAX;
2233 } else {
2234 delay += fixup;
2235 info.blocks = delay / runtime->oss.period_bytes;
2236 info.bytes = (runtime->oss.bytes + delay) & INT_MAX;
2237 }
2238 }
2239 if (copy_to_user(_info, &info, sizeof(info)))
2240 return -EFAULT;
2241 return 0;
2242 }
2243
snd_pcm_oss_get_space(struct snd_pcm_oss_file * pcm_oss_file,int stream,struct audio_buf_info __user * _info)2244 static int snd_pcm_oss_get_space(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct audio_buf_info __user *_info)
2245 {
2246 struct snd_pcm_substream *substream;
2247 struct snd_pcm_runtime *runtime;
2248 snd_pcm_sframes_t avail;
2249 int fixup;
2250 struct audio_buf_info info;
2251 int err;
2252
2253 if (_info == NULL)
2254 return -EFAULT;
2255 substream = pcm_oss_file->streams[stream];
2256 if (substream == NULL)
2257 return -EINVAL;
2258 runtime = substream->runtime;
2259
2260 if (runtime->oss.params &&
2261 (err = snd_pcm_oss_change_params(substream, false)) < 0)
2262 return err;
2263
2264 info.fragsize = runtime->oss.period_bytes;
2265 info.fragstotal = runtime->periods;
2266 if (runtime->oss.prepare) {
2267 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2268 info.bytes = runtime->oss.period_bytes * runtime->oss.periods;
2269 info.fragments = runtime->oss.periods;
2270 } else {
2271 info.bytes = 0;
2272 info.fragments = 0;
2273 }
2274 } else {
2275 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2276 err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &avail);
2277 if (err == -EPIPE || err == -ESTRPIPE || (! err && avail < 0)) {
2278 avail = runtime->buffer_size;
2279 err = 0;
2280 fixup = 0;
2281 } else {
2282 avail = runtime->buffer_size - avail;
2283 fixup = -runtime->oss.buffer_used;
2284 }
2285 } else {
2286 err = snd_pcm_oss_capture_position_fixup(substream, &avail);
2287 fixup = runtime->oss.buffer_used;
2288 }
2289 if (err < 0)
2290 return err;
2291 info.bytes = snd_pcm_oss_bytes(substream, avail) + fixup;
2292 info.fragments = info.bytes / runtime->oss.period_bytes;
2293 }
2294
2295 #ifdef OSS_DEBUG
2296 pcm_dbg(substream->pcm,
2297 "pcm_oss: space: bytes = %i, fragments = %i, fragstotal = %i, fragsize = %i\n",
2298 info.bytes, info.fragments, info.fragstotal, info.fragsize);
2299 #endif
2300 if (copy_to_user(_info, &info, sizeof(info)))
2301 return -EFAULT;
2302 return 0;
2303 }
2304
snd_pcm_oss_get_mapbuf(struct snd_pcm_oss_file * pcm_oss_file,int stream,struct buffmem_desc __user * _info)2305 static int snd_pcm_oss_get_mapbuf(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct buffmem_desc __user * _info)
2306 {
2307 // it won't be probably implemented
2308 // pr_debug("TODO: snd_pcm_oss_get_mapbuf\n");
2309 return -EINVAL;
2310 }
2311
strip_task_path(const char * path)2312 static const char *strip_task_path(const char *path)
2313 {
2314 const char *ptr, *ptrl = NULL;
2315 for (ptr = path; *ptr; ptr++) {
2316 if (*ptr == '/')
2317 ptrl = ptr + 1;
2318 }
2319 return ptrl;
2320 }
2321
snd_pcm_oss_look_for_setup(struct snd_pcm * pcm,int stream,const char * task_name,struct snd_pcm_oss_setup * rsetup)2322 static void snd_pcm_oss_look_for_setup(struct snd_pcm *pcm, int stream,
2323 const char *task_name,
2324 struct snd_pcm_oss_setup *rsetup)
2325 {
2326 struct snd_pcm_oss_setup *setup;
2327
2328 mutex_lock(&pcm->streams[stream].oss.setup_mutex);
2329 do {
2330 for (setup = pcm->streams[stream].oss.setup_list; setup;
2331 setup = setup->next) {
2332 if (!strcmp(setup->task_name, task_name))
2333 goto out;
2334 }
2335 } while ((task_name = strip_task_path(task_name)) != NULL);
2336 out:
2337 if (setup)
2338 *rsetup = *setup;
2339 mutex_unlock(&pcm->streams[stream].oss.setup_mutex);
2340 }
2341
snd_pcm_oss_release_substream(struct snd_pcm_substream * substream)2342 static void snd_pcm_oss_release_substream(struct snd_pcm_substream *substream)
2343 {
2344 struct snd_pcm_runtime *runtime;
2345 runtime = substream->runtime;
2346 kvfree(runtime->oss.buffer);
2347 runtime->oss.buffer = NULL;
2348 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
2349 snd_pcm_oss_plugin_clear(substream);
2350 #endif
2351 substream->oss.oss = 0;
2352 }
2353
snd_pcm_oss_init_substream(struct snd_pcm_substream * substream,struct snd_pcm_oss_setup * setup,int minor)2354 static void snd_pcm_oss_init_substream(struct snd_pcm_substream *substream,
2355 struct snd_pcm_oss_setup *setup,
2356 int minor)
2357 {
2358 struct snd_pcm_runtime *runtime;
2359
2360 substream->oss.oss = 1;
2361 substream->oss.setup = *setup;
2362 if (setup->nonblock)
2363 substream->f_flags |= O_NONBLOCK;
2364 else if (setup->block)
2365 substream->f_flags &= ~O_NONBLOCK;
2366 runtime = substream->runtime;
2367 runtime->oss.params = 1;
2368 runtime->oss.trigger = 1;
2369 runtime->oss.rate = 8000;
2370 mutex_init(&runtime->oss.params_lock);
2371 switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
2372 case SNDRV_MINOR_OSS_PCM_8:
2373 runtime->oss.format = AFMT_U8;
2374 break;
2375 case SNDRV_MINOR_OSS_PCM_16:
2376 runtime->oss.format = AFMT_S16_LE;
2377 break;
2378 default:
2379 runtime->oss.format = AFMT_MU_LAW;
2380 }
2381 runtime->oss.channels = 1;
2382 runtime->oss.fragshift = 0;
2383 runtime->oss.maxfrags = 0;
2384 runtime->oss.subdivision = 0;
2385 substream->pcm_release = snd_pcm_oss_release_substream;
2386 atomic_set(&runtime->oss.rw_ref, 0);
2387 }
2388
snd_pcm_oss_release_file(struct snd_pcm_oss_file * pcm_oss_file)2389 static int snd_pcm_oss_release_file(struct snd_pcm_oss_file *pcm_oss_file)
2390 {
2391 int cidx;
2392 if (!pcm_oss_file)
2393 return 0;
2394 for (cidx = 0; cidx < 2; ++cidx) {
2395 struct snd_pcm_substream *substream = pcm_oss_file->streams[cidx];
2396 if (substream)
2397 snd_pcm_release_substream(substream);
2398 }
2399 kfree(pcm_oss_file);
2400 return 0;
2401 }
2402
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)2403 static int snd_pcm_oss_open_file(struct file *file,
2404 struct snd_pcm *pcm,
2405 struct snd_pcm_oss_file **rpcm_oss_file,
2406 int minor,
2407 struct snd_pcm_oss_setup *setup)
2408 {
2409 int idx, err;
2410 struct snd_pcm_oss_file *pcm_oss_file;
2411 struct snd_pcm_substream *substream;
2412 fmode_t f_mode = file->f_mode;
2413
2414 if (rpcm_oss_file)
2415 *rpcm_oss_file = NULL;
2416
2417 pcm_oss_file = kzalloc(sizeof(*pcm_oss_file), GFP_KERNEL);
2418 if (pcm_oss_file == NULL)
2419 return -ENOMEM;
2420
2421 if ((f_mode & (FMODE_WRITE|FMODE_READ)) == (FMODE_WRITE|FMODE_READ) &&
2422 (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX))
2423 f_mode = FMODE_WRITE;
2424
2425 file->f_flags &= ~O_APPEND;
2426 for (idx = 0; idx < 2; idx++) {
2427 if (setup[idx].disable)
2428 continue;
2429 if (! pcm->streams[idx].substream_count)
2430 continue; /* no matching substream */
2431 if (idx == SNDRV_PCM_STREAM_PLAYBACK) {
2432 if (! (f_mode & FMODE_WRITE))
2433 continue;
2434 } else {
2435 if (! (f_mode & FMODE_READ))
2436 continue;
2437 }
2438 err = snd_pcm_open_substream(pcm, idx, file, &substream);
2439 if (err < 0) {
2440 snd_pcm_oss_release_file(pcm_oss_file);
2441 return err;
2442 }
2443
2444 pcm_oss_file->streams[idx] = substream;
2445 snd_pcm_oss_init_substream(substream, &setup[idx], minor);
2446 }
2447
2448 if (!pcm_oss_file->streams[0] && !pcm_oss_file->streams[1]) {
2449 snd_pcm_oss_release_file(pcm_oss_file);
2450 return -EINVAL;
2451 }
2452
2453 file->private_data = pcm_oss_file;
2454 if (rpcm_oss_file)
2455 *rpcm_oss_file = pcm_oss_file;
2456 return 0;
2457 }
2458
2459
snd_task_name(struct task_struct * task,char * name,size_t size)2460 static int snd_task_name(struct task_struct *task, char *name, size_t size)
2461 {
2462 unsigned int idx;
2463
2464 if (snd_BUG_ON(!task || !name || size < 2))
2465 return -EINVAL;
2466 for (idx = 0; idx < sizeof(task->comm) && idx + 1 < size; idx++)
2467 name[idx] = task->comm[idx];
2468 name[idx] = '\0';
2469 return 0;
2470 }
2471
snd_pcm_oss_open(struct inode * inode,struct file * file)2472 static int snd_pcm_oss_open(struct inode *inode, struct file *file)
2473 {
2474 int err;
2475 char task_name[32];
2476 struct snd_pcm *pcm;
2477 struct snd_pcm_oss_file *pcm_oss_file;
2478 struct snd_pcm_oss_setup setup[2];
2479 int nonblock;
2480 wait_queue_entry_t wait;
2481
2482 err = nonseekable_open(inode, file);
2483 if (err < 0)
2484 return err;
2485
2486 pcm = snd_lookup_oss_minor_data(iminor(inode),
2487 SNDRV_OSS_DEVICE_TYPE_PCM);
2488 if (pcm == NULL) {
2489 err = -ENODEV;
2490 goto __error1;
2491 }
2492 err = snd_card_file_add(pcm->card, file);
2493 if (err < 0)
2494 goto __error1;
2495 if (!try_module_get(pcm->card->module)) {
2496 err = -EFAULT;
2497 goto __error2;
2498 }
2499 if (snd_task_name(current, task_name, sizeof(task_name)) < 0) {
2500 err = -EFAULT;
2501 goto __error;
2502 }
2503 memset(setup, 0, sizeof(setup));
2504 if (file->f_mode & FMODE_WRITE)
2505 snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_PLAYBACK,
2506 task_name, &setup[0]);
2507 if (file->f_mode & FMODE_READ)
2508 snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_CAPTURE,
2509 task_name, &setup[1]);
2510
2511 nonblock = !!(file->f_flags & O_NONBLOCK);
2512 if (!nonblock)
2513 nonblock = nonblock_open;
2514
2515 init_waitqueue_entry(&wait, current);
2516 add_wait_queue(&pcm->open_wait, &wait);
2517 mutex_lock(&pcm->open_mutex);
2518 while (1) {
2519 err = snd_pcm_oss_open_file(file, pcm, &pcm_oss_file,
2520 iminor(inode), setup);
2521 if (err >= 0)
2522 break;
2523 if (err == -EAGAIN) {
2524 if (nonblock) {
2525 err = -EBUSY;
2526 break;
2527 }
2528 } else
2529 break;
2530 set_current_state(TASK_INTERRUPTIBLE);
2531 mutex_unlock(&pcm->open_mutex);
2532 schedule();
2533 mutex_lock(&pcm->open_mutex);
2534 if (pcm->card->shutdown) {
2535 err = -ENODEV;
2536 break;
2537 }
2538 if (signal_pending(current)) {
2539 err = -ERESTARTSYS;
2540 break;
2541 }
2542 }
2543 remove_wait_queue(&pcm->open_wait, &wait);
2544 mutex_unlock(&pcm->open_mutex);
2545 if (err < 0)
2546 goto __error;
2547 snd_card_unref(pcm->card);
2548 return err;
2549
2550 __error:
2551 module_put(pcm->card->module);
2552 __error2:
2553 snd_card_file_remove(pcm->card, file);
2554 __error1:
2555 if (pcm)
2556 snd_card_unref(pcm->card);
2557 return err;
2558 }
2559
snd_pcm_oss_release(struct inode * inode,struct file * file)2560 static int snd_pcm_oss_release(struct inode *inode, struct file *file)
2561 {
2562 struct snd_pcm *pcm;
2563 struct snd_pcm_substream *substream;
2564 struct snd_pcm_oss_file *pcm_oss_file;
2565
2566 pcm_oss_file = file->private_data;
2567 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2568 if (substream == NULL)
2569 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2570 if (snd_BUG_ON(!substream))
2571 return -ENXIO;
2572 pcm = substream->pcm;
2573 if (!pcm->card->shutdown)
2574 snd_pcm_oss_sync(pcm_oss_file);
2575 mutex_lock(&pcm->open_mutex);
2576 snd_pcm_oss_release_file(pcm_oss_file);
2577 mutex_unlock(&pcm->open_mutex);
2578 wake_up(&pcm->open_wait);
2579 module_put(pcm->card->module);
2580 snd_card_file_remove(pcm->card, file);
2581 return 0;
2582 }
2583
snd_pcm_oss_ioctl(struct file * file,unsigned int cmd,unsigned long arg)2584 static long snd_pcm_oss_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2585 {
2586 struct snd_pcm_oss_file *pcm_oss_file;
2587 int __user *p = (int __user *)arg;
2588 int res;
2589
2590 pcm_oss_file = file->private_data;
2591 if (cmd == OSS_GETVERSION)
2592 return put_user(SNDRV_OSS_VERSION, p);
2593 if (cmd == OSS_ALSAEMULVER)
2594 return put_user(1, p);
2595 #if IS_REACHABLE(CONFIG_SND_MIXER_OSS)
2596 if (((cmd >> 8) & 0xff) == 'M') { /* mixer ioctl - for OSS compatibility */
2597 struct snd_pcm_substream *substream;
2598 int idx;
2599 for (idx = 0; idx < 2; ++idx) {
2600 substream = pcm_oss_file->streams[idx];
2601 if (substream != NULL)
2602 break;
2603 }
2604 if (snd_BUG_ON(idx >= 2))
2605 return -ENXIO;
2606 return snd_mixer_oss_ioctl_card(substream->pcm->card, cmd, arg);
2607 }
2608 #endif
2609 if (((cmd >> 8) & 0xff) != 'P')
2610 return -EINVAL;
2611 #ifdef OSS_DEBUG
2612 pr_debug("pcm_oss: ioctl = 0x%x\n", cmd);
2613 #endif
2614 switch (cmd) {
2615 case SNDCTL_DSP_RESET:
2616 return snd_pcm_oss_reset(pcm_oss_file);
2617 case SNDCTL_DSP_SYNC:
2618 return snd_pcm_oss_sync(pcm_oss_file);
2619 case SNDCTL_DSP_SPEED:
2620 if (get_user(res, p))
2621 return -EFAULT;
2622 if ((res = snd_pcm_oss_set_rate(pcm_oss_file, res))<0)
2623 return res;
2624 return put_user(res, p);
2625 case SOUND_PCM_READ_RATE:
2626 res = snd_pcm_oss_get_rate(pcm_oss_file);
2627 if (res < 0)
2628 return res;
2629 return put_user(res, p);
2630 case SNDCTL_DSP_STEREO:
2631 if (get_user(res, p))
2632 return -EFAULT;
2633 res = res > 0 ? 2 : 1;
2634 if ((res = snd_pcm_oss_set_channels(pcm_oss_file, res)) < 0)
2635 return res;
2636 return put_user(--res, p);
2637 case SNDCTL_DSP_GETBLKSIZE:
2638 res = snd_pcm_oss_get_block_size(pcm_oss_file);
2639 if (res < 0)
2640 return res;
2641 return put_user(res, p);
2642 case SNDCTL_DSP_SETFMT:
2643 if (get_user(res, p))
2644 return -EFAULT;
2645 res = snd_pcm_oss_set_format(pcm_oss_file, res);
2646 if (res < 0)
2647 return res;
2648 return put_user(res, p);
2649 case SOUND_PCM_READ_BITS:
2650 res = snd_pcm_oss_get_format(pcm_oss_file);
2651 if (res < 0)
2652 return res;
2653 return put_user(res, p);
2654 case SNDCTL_DSP_CHANNELS:
2655 if (get_user(res, p))
2656 return -EFAULT;
2657 res = snd_pcm_oss_set_channels(pcm_oss_file, res);
2658 if (res < 0)
2659 return res;
2660 return put_user(res, p);
2661 case SOUND_PCM_READ_CHANNELS:
2662 res = snd_pcm_oss_get_channels(pcm_oss_file);
2663 if (res < 0)
2664 return res;
2665 return put_user(res, p);
2666 case SOUND_PCM_WRITE_FILTER:
2667 case SOUND_PCM_READ_FILTER:
2668 return -EIO;
2669 case SNDCTL_DSP_POST:
2670 return snd_pcm_oss_post(pcm_oss_file);
2671 case SNDCTL_DSP_SUBDIVIDE:
2672 if (get_user(res, p))
2673 return -EFAULT;
2674 res = snd_pcm_oss_set_subdivide(pcm_oss_file, res);
2675 if (res < 0)
2676 return res;
2677 return put_user(res, p);
2678 case SNDCTL_DSP_SETFRAGMENT:
2679 if (get_user(res, p))
2680 return -EFAULT;
2681 return snd_pcm_oss_set_fragment(pcm_oss_file, res);
2682 case SNDCTL_DSP_GETFMTS:
2683 res = snd_pcm_oss_get_formats(pcm_oss_file);
2684 if (res < 0)
2685 return res;
2686 return put_user(res, p);
2687 case SNDCTL_DSP_GETOSPACE:
2688 case SNDCTL_DSP_GETISPACE:
2689 return snd_pcm_oss_get_space(pcm_oss_file,
2690 cmd == SNDCTL_DSP_GETISPACE ?
2691 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2692 (struct audio_buf_info __user *) arg);
2693 case SNDCTL_DSP_NONBLOCK:
2694 return snd_pcm_oss_nonblock(file);
2695 case SNDCTL_DSP_GETCAPS:
2696 res = snd_pcm_oss_get_caps(pcm_oss_file);
2697 if (res < 0)
2698 return res;
2699 return put_user(res, p);
2700 case SNDCTL_DSP_GETTRIGGER:
2701 res = snd_pcm_oss_get_trigger(pcm_oss_file);
2702 if (res < 0)
2703 return res;
2704 return put_user(res, p);
2705 case SNDCTL_DSP_SETTRIGGER:
2706 if (get_user(res, p))
2707 return -EFAULT;
2708 return snd_pcm_oss_set_trigger(pcm_oss_file, res);
2709 case SNDCTL_DSP_GETIPTR:
2710 case SNDCTL_DSP_GETOPTR:
2711 return snd_pcm_oss_get_ptr(pcm_oss_file,
2712 cmd == SNDCTL_DSP_GETIPTR ?
2713 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2714 (struct count_info __user *) arg);
2715 case SNDCTL_DSP_MAPINBUF:
2716 case SNDCTL_DSP_MAPOUTBUF:
2717 return snd_pcm_oss_get_mapbuf(pcm_oss_file,
2718 cmd == SNDCTL_DSP_MAPINBUF ?
2719 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2720 (struct buffmem_desc __user *) arg);
2721 case SNDCTL_DSP_SETSYNCRO:
2722 /* stop DMA now.. */
2723 return 0;
2724 case SNDCTL_DSP_SETDUPLEX:
2725 if (snd_pcm_oss_get_caps(pcm_oss_file) & DSP_CAP_DUPLEX)
2726 return 0;
2727 return -EIO;
2728 case SNDCTL_DSP_GETODELAY:
2729 res = snd_pcm_oss_get_odelay(pcm_oss_file);
2730 if (res < 0) {
2731 /* it's for sure, some broken apps don't check for error codes */
2732 put_user(0, p);
2733 return res;
2734 }
2735 return put_user(res, p);
2736 case SNDCTL_DSP_PROFILE:
2737 return 0; /* silently ignore */
2738 default:
2739 pr_debug("pcm_oss: unknown command = 0x%x\n", cmd);
2740 }
2741 return -EINVAL;
2742 }
2743
2744 #ifdef CONFIG_COMPAT
2745 /* all compatible */
snd_pcm_oss_ioctl_compat(struct file * file,unsigned int cmd,unsigned long arg)2746 static long snd_pcm_oss_ioctl_compat(struct file *file, unsigned int cmd,
2747 unsigned long arg)
2748 {
2749 /*
2750 * Everything is compatbile except SNDCTL_DSP_MAPINBUF/SNDCTL_DSP_MAPOUTBUF,
2751 * which are not implemented for the native case either
2752 */
2753 return snd_pcm_oss_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
2754 }
2755 #else
2756 #define snd_pcm_oss_ioctl_compat NULL
2757 #endif
2758
snd_pcm_oss_read(struct file * file,char __user * buf,size_t count,loff_t * offset)2759 static ssize_t snd_pcm_oss_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
2760 {
2761 struct snd_pcm_oss_file *pcm_oss_file;
2762 struct snd_pcm_substream *substream;
2763
2764 pcm_oss_file = file->private_data;
2765 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2766 if (substream == NULL)
2767 return -ENXIO;
2768 substream->f_flags = file->f_flags & O_NONBLOCK;
2769 #ifndef OSS_DEBUG
2770 return snd_pcm_oss_read1(substream, buf, count);
2771 #else
2772 {
2773 ssize_t res = snd_pcm_oss_read1(substream, buf, count);
2774 pcm_dbg(substream->pcm,
2775 "pcm_oss: read %li bytes (returned %li bytes)\n",
2776 (long)count, (long)res);
2777 return res;
2778 }
2779 #endif
2780 }
2781
snd_pcm_oss_write(struct file * file,const char __user * buf,size_t count,loff_t * offset)2782 static ssize_t snd_pcm_oss_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
2783 {
2784 struct snd_pcm_oss_file *pcm_oss_file;
2785 struct snd_pcm_substream *substream;
2786 long result;
2787
2788 pcm_oss_file = file->private_data;
2789 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2790 if (substream == NULL)
2791 return -ENXIO;
2792 substream->f_flags = file->f_flags & O_NONBLOCK;
2793 result = snd_pcm_oss_write1(substream, buf, count);
2794 #ifdef OSS_DEBUG
2795 pcm_dbg(substream->pcm, "pcm_oss: write %li bytes (wrote %li bytes)\n",
2796 (long)count, (long)result);
2797 #endif
2798 return result;
2799 }
2800
snd_pcm_oss_playback_ready(struct snd_pcm_substream * substream)2801 static int snd_pcm_oss_playback_ready(struct snd_pcm_substream *substream)
2802 {
2803 struct snd_pcm_runtime *runtime = substream->runtime;
2804 if (atomic_read(&substream->mmap_count))
2805 return runtime->oss.prev_hw_ptr_period !=
2806 get_hw_ptr_period(runtime);
2807 else
2808 return snd_pcm_playback_avail(runtime) >=
2809 runtime->oss.period_frames;
2810 }
2811
snd_pcm_oss_capture_ready(struct snd_pcm_substream * substream)2812 static int snd_pcm_oss_capture_ready(struct snd_pcm_substream *substream)
2813 {
2814 struct snd_pcm_runtime *runtime = substream->runtime;
2815 if (atomic_read(&substream->mmap_count))
2816 return runtime->oss.prev_hw_ptr_period !=
2817 get_hw_ptr_period(runtime);
2818 else
2819 return snd_pcm_capture_avail(runtime) >=
2820 runtime->oss.period_frames;
2821 }
2822
snd_pcm_oss_poll(struct file * file,poll_table * wait)2823 static __poll_t snd_pcm_oss_poll(struct file *file, poll_table * wait)
2824 {
2825 struct snd_pcm_oss_file *pcm_oss_file;
2826 __poll_t mask;
2827 struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2828
2829 pcm_oss_file = file->private_data;
2830
2831 psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2832 csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2833
2834 mask = 0;
2835 if (psubstream != NULL) {
2836 struct snd_pcm_runtime *runtime = psubstream->runtime;
2837 poll_wait(file, &runtime->sleep, wait);
2838 snd_pcm_stream_lock_irq(psubstream);
2839 if (runtime->status->state != SNDRV_PCM_STATE_DRAINING &&
2840 (runtime->status->state != SNDRV_PCM_STATE_RUNNING ||
2841 snd_pcm_oss_playback_ready(psubstream)))
2842 mask |= EPOLLOUT | EPOLLWRNORM;
2843 snd_pcm_stream_unlock_irq(psubstream);
2844 }
2845 if (csubstream != NULL) {
2846 struct snd_pcm_runtime *runtime = csubstream->runtime;
2847 snd_pcm_state_t ostate;
2848 poll_wait(file, &runtime->sleep, wait);
2849 snd_pcm_stream_lock_irq(csubstream);
2850 if ((ostate = runtime->status->state) != SNDRV_PCM_STATE_RUNNING ||
2851 snd_pcm_oss_capture_ready(csubstream))
2852 mask |= EPOLLIN | EPOLLRDNORM;
2853 snd_pcm_stream_unlock_irq(csubstream);
2854 if (ostate != SNDRV_PCM_STATE_RUNNING && runtime->oss.trigger) {
2855 struct snd_pcm_oss_file ofile;
2856 memset(&ofile, 0, sizeof(ofile));
2857 ofile.streams[SNDRV_PCM_STREAM_CAPTURE] = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2858 runtime->oss.trigger = 0;
2859 snd_pcm_oss_set_trigger(&ofile, PCM_ENABLE_INPUT);
2860 }
2861 }
2862
2863 return mask;
2864 }
2865
snd_pcm_oss_mmap(struct file * file,struct vm_area_struct * area)2866 static int snd_pcm_oss_mmap(struct file *file, struct vm_area_struct *area)
2867 {
2868 struct snd_pcm_oss_file *pcm_oss_file;
2869 struct snd_pcm_substream *substream = NULL;
2870 struct snd_pcm_runtime *runtime;
2871 int err;
2872
2873 #ifdef OSS_DEBUG
2874 pr_debug("pcm_oss: mmap begin\n");
2875 #endif
2876 pcm_oss_file = file->private_data;
2877 switch ((area->vm_flags & (VM_READ | VM_WRITE))) {
2878 case VM_READ | VM_WRITE:
2879 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2880 if (substream)
2881 break;
2882 fallthrough;
2883 case VM_READ:
2884 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2885 break;
2886 case VM_WRITE:
2887 substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2888 break;
2889 default:
2890 return -EINVAL;
2891 }
2892 /* set VM_READ access as well to fix memset() routines that do
2893 reads before writes (to improve performance) */
2894 area->vm_flags |= VM_READ;
2895 if (substream == NULL)
2896 return -ENXIO;
2897 runtime = substream->runtime;
2898 if (!(runtime->info & SNDRV_PCM_INFO_MMAP_VALID))
2899 return -EIO;
2900 if (runtime->info & SNDRV_PCM_INFO_INTERLEAVED)
2901 runtime->access = SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2902 else
2903 return -EIO;
2904
2905 if (runtime->oss.params) {
2906 /* use mutex_trylock() for params_lock for avoiding a deadlock
2907 * between mmap_lock and params_lock taken by
2908 * copy_from/to_user() in snd_pcm_oss_write/read()
2909 */
2910 err = snd_pcm_oss_change_params(substream, true);
2911 if (err < 0)
2912 return err;
2913 }
2914 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
2915 if (runtime->oss.plugin_first != NULL)
2916 return -EIO;
2917 #endif
2918
2919 if (area->vm_pgoff != 0)
2920 return -EINVAL;
2921
2922 err = snd_pcm_mmap_data(substream, file, area);
2923 if (err < 0)
2924 return err;
2925 runtime->oss.mmap_bytes = area->vm_end - area->vm_start;
2926 runtime->silence_threshold = 0;
2927 runtime->silence_size = 0;
2928 #ifdef OSS_DEBUG
2929 pr_debug("pcm_oss: mmap ok, bytes = 0x%x\n",
2930 runtime->oss.mmap_bytes);
2931 #endif
2932 /* In mmap mode we never stop */
2933 runtime->stop_threshold = runtime->boundary;
2934
2935 return 0;
2936 }
2937
2938 #ifdef CONFIG_SND_VERBOSE_PROCFS
2939 /*
2940 * /proc interface
2941 */
2942
snd_pcm_oss_proc_read(struct snd_info_entry * entry,struct snd_info_buffer * buffer)2943 static void snd_pcm_oss_proc_read(struct snd_info_entry *entry,
2944 struct snd_info_buffer *buffer)
2945 {
2946 struct snd_pcm_str *pstr = entry->private_data;
2947 struct snd_pcm_oss_setup *setup = pstr->oss.setup_list;
2948 mutex_lock(&pstr->oss.setup_mutex);
2949 while (setup) {
2950 snd_iprintf(buffer, "%s %u %u%s%s%s%s%s%s\n",
2951 setup->task_name,
2952 setup->periods,
2953 setup->period_size,
2954 setup->disable ? " disable" : "",
2955 setup->direct ? " direct" : "",
2956 setup->block ? " block" : "",
2957 setup->nonblock ? " non-block" : "",
2958 setup->partialfrag ? " partial-frag" : "",
2959 setup->nosilence ? " no-silence" : "");
2960 setup = setup->next;
2961 }
2962 mutex_unlock(&pstr->oss.setup_mutex);
2963 }
2964
snd_pcm_oss_proc_free_setup_list(struct snd_pcm_str * pstr)2965 static void snd_pcm_oss_proc_free_setup_list(struct snd_pcm_str * pstr)
2966 {
2967 struct snd_pcm_oss_setup *setup, *setupn;
2968
2969 for (setup = pstr->oss.setup_list, pstr->oss.setup_list = NULL;
2970 setup; setup = setupn) {
2971 setupn = setup->next;
2972 kfree(setup->task_name);
2973 kfree(setup);
2974 }
2975 pstr->oss.setup_list = NULL;
2976 }
2977
snd_pcm_oss_proc_write(struct snd_info_entry * entry,struct snd_info_buffer * buffer)2978 static void snd_pcm_oss_proc_write(struct snd_info_entry *entry,
2979 struct snd_info_buffer *buffer)
2980 {
2981 struct snd_pcm_str *pstr = entry->private_data;
2982 char line[128], str[32], task_name[32];
2983 const char *ptr;
2984 int idx1;
2985 struct snd_pcm_oss_setup *setup, *setup1, template;
2986
2987 while (!snd_info_get_line(buffer, line, sizeof(line))) {
2988 mutex_lock(&pstr->oss.setup_mutex);
2989 memset(&template, 0, sizeof(template));
2990 ptr = snd_info_get_str(task_name, line, sizeof(task_name));
2991 if (!strcmp(task_name, "clear") || !strcmp(task_name, "erase")) {
2992 snd_pcm_oss_proc_free_setup_list(pstr);
2993 mutex_unlock(&pstr->oss.setup_mutex);
2994 continue;
2995 }
2996 for (setup = pstr->oss.setup_list; setup; setup = setup->next) {
2997 if (!strcmp(setup->task_name, task_name)) {
2998 template = *setup;
2999 break;
3000 }
3001 }
3002 ptr = snd_info_get_str(str, ptr, sizeof(str));
3003 template.periods = simple_strtoul(str, NULL, 10);
3004 ptr = snd_info_get_str(str, ptr, sizeof(str));
3005 template.period_size = simple_strtoul(str, NULL, 10);
3006 for (idx1 = 31; idx1 >= 0; idx1--)
3007 if (template.period_size & (1 << idx1))
3008 break;
3009 for (idx1--; idx1 >= 0; idx1--)
3010 template.period_size &= ~(1 << idx1);
3011 do {
3012 ptr = snd_info_get_str(str, ptr, sizeof(str));
3013 if (!strcmp(str, "disable")) {
3014 template.disable = 1;
3015 } else if (!strcmp(str, "direct")) {
3016 template.direct = 1;
3017 } else if (!strcmp(str, "block")) {
3018 template.block = 1;
3019 } else if (!strcmp(str, "non-block")) {
3020 template.nonblock = 1;
3021 } else if (!strcmp(str, "partial-frag")) {
3022 template.partialfrag = 1;
3023 } else if (!strcmp(str, "no-silence")) {
3024 template.nosilence = 1;
3025 } else if (!strcmp(str, "buggy-ptr")) {
3026 template.buggyptr = 1;
3027 }
3028 } while (*str);
3029 if (setup == NULL) {
3030 setup = kmalloc(sizeof(*setup), GFP_KERNEL);
3031 if (! setup) {
3032 buffer->error = -ENOMEM;
3033 mutex_unlock(&pstr->oss.setup_mutex);
3034 return;
3035 }
3036 if (pstr->oss.setup_list == NULL)
3037 pstr->oss.setup_list = setup;
3038 else {
3039 for (setup1 = pstr->oss.setup_list;
3040 setup1->next; setup1 = setup1->next);
3041 setup1->next = setup;
3042 }
3043 template.task_name = kstrdup(task_name, GFP_KERNEL);
3044 if (! template.task_name) {
3045 kfree(setup);
3046 buffer->error = -ENOMEM;
3047 mutex_unlock(&pstr->oss.setup_mutex);
3048 return;
3049 }
3050 }
3051 *setup = template;
3052 mutex_unlock(&pstr->oss.setup_mutex);
3053 }
3054 }
3055
snd_pcm_oss_proc_init(struct snd_pcm * pcm)3056 static void snd_pcm_oss_proc_init(struct snd_pcm *pcm)
3057 {
3058 int stream;
3059 for (stream = 0; stream < 2; ++stream) {
3060 struct snd_info_entry *entry;
3061 struct snd_pcm_str *pstr = &pcm->streams[stream];
3062 if (pstr->substream_count == 0)
3063 continue;
3064 if ((entry = snd_info_create_card_entry(pcm->card, "oss", pstr->proc_root)) != NULL) {
3065 entry->content = SNDRV_INFO_CONTENT_TEXT;
3066 entry->mode = S_IFREG | 0644;
3067 entry->c.text.read = snd_pcm_oss_proc_read;
3068 entry->c.text.write = snd_pcm_oss_proc_write;
3069 entry->private_data = pstr;
3070 if (snd_info_register(entry) < 0) {
3071 snd_info_free_entry(entry);
3072 entry = NULL;
3073 }
3074 }
3075 pstr->oss.proc_entry = entry;
3076 }
3077 }
3078
snd_pcm_oss_proc_done(struct snd_pcm * pcm)3079 static void snd_pcm_oss_proc_done(struct snd_pcm *pcm)
3080 {
3081 int stream;
3082 for (stream = 0; stream < 2; ++stream) {
3083 struct snd_pcm_str *pstr = &pcm->streams[stream];
3084 snd_info_free_entry(pstr->oss.proc_entry);
3085 pstr->oss.proc_entry = NULL;
3086 snd_pcm_oss_proc_free_setup_list(pstr);
3087 }
3088 }
3089 #else /* !CONFIG_SND_VERBOSE_PROCFS */
3090 #define snd_pcm_oss_proc_init(pcm)
3091 #define snd_pcm_oss_proc_done(pcm)
3092 #endif /* CONFIG_SND_VERBOSE_PROCFS */
3093
3094 /*
3095 * ENTRY functions
3096 */
3097
3098 static const struct file_operations snd_pcm_oss_f_reg =
3099 {
3100 .owner = THIS_MODULE,
3101 .read = snd_pcm_oss_read,
3102 .write = snd_pcm_oss_write,
3103 .open = snd_pcm_oss_open,
3104 .release = snd_pcm_oss_release,
3105 .llseek = no_llseek,
3106 .poll = snd_pcm_oss_poll,
3107 .unlocked_ioctl = snd_pcm_oss_ioctl,
3108 .compat_ioctl = snd_pcm_oss_ioctl_compat,
3109 .mmap = snd_pcm_oss_mmap,
3110 };
3111
register_oss_dsp(struct snd_pcm * pcm,int index)3112 static void register_oss_dsp(struct snd_pcm *pcm, int index)
3113 {
3114 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3115 pcm->card, index, &snd_pcm_oss_f_reg,
3116 pcm) < 0) {
3117 pcm_err(pcm, "unable to register OSS PCM device %i:%i\n",
3118 pcm->card->number, pcm->device);
3119 }
3120 }
3121
snd_pcm_oss_register_minor(struct snd_pcm * pcm)3122 static int snd_pcm_oss_register_minor(struct snd_pcm *pcm)
3123 {
3124 pcm->oss.reg = 0;
3125 if (dsp_map[pcm->card->number] == (int)pcm->device) {
3126 char name[128];
3127 int duplex;
3128 register_oss_dsp(pcm, 0);
3129 duplex = (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count > 0 &&
3130 pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count &&
3131 !(pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX));
3132 sprintf(name, "%s%s", pcm->name, duplex ? " (DUPLEX)" : "");
3133 #ifdef SNDRV_OSS_INFO_DEV_AUDIO
3134 snd_oss_info_register(SNDRV_OSS_INFO_DEV_AUDIO,
3135 pcm->card->number,
3136 name);
3137 #endif
3138 pcm->oss.reg++;
3139 pcm->oss.reg_mask |= 1;
3140 }
3141 if (adsp_map[pcm->card->number] == (int)pcm->device) {
3142 register_oss_dsp(pcm, 1);
3143 pcm->oss.reg++;
3144 pcm->oss.reg_mask |= 2;
3145 }
3146
3147 if (pcm->oss.reg)
3148 snd_pcm_oss_proc_init(pcm);
3149
3150 return 0;
3151 }
3152
snd_pcm_oss_disconnect_minor(struct snd_pcm * pcm)3153 static int snd_pcm_oss_disconnect_minor(struct snd_pcm *pcm)
3154 {
3155 if (pcm->oss.reg) {
3156 if (pcm->oss.reg_mask & 1) {
3157 pcm->oss.reg_mask &= ~1;
3158 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3159 pcm->card, 0);
3160 }
3161 if (pcm->oss.reg_mask & 2) {
3162 pcm->oss.reg_mask &= ~2;
3163 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3164 pcm->card, 1);
3165 }
3166 if (dsp_map[pcm->card->number] == (int)pcm->device) {
3167 #ifdef SNDRV_OSS_INFO_DEV_AUDIO
3168 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_AUDIO, pcm->card->number);
3169 #endif
3170 }
3171 pcm->oss.reg = 0;
3172 }
3173 return 0;
3174 }
3175
snd_pcm_oss_unregister_minor(struct snd_pcm * pcm)3176 static int snd_pcm_oss_unregister_minor(struct snd_pcm *pcm)
3177 {
3178 snd_pcm_oss_disconnect_minor(pcm);
3179 snd_pcm_oss_proc_done(pcm);
3180 return 0;
3181 }
3182
3183 static struct snd_pcm_notify snd_pcm_oss_notify =
3184 {
3185 .n_register = snd_pcm_oss_register_minor,
3186 .n_disconnect = snd_pcm_oss_disconnect_minor,
3187 .n_unregister = snd_pcm_oss_unregister_minor,
3188 };
3189
alsa_pcm_oss_init(void)3190 static int __init alsa_pcm_oss_init(void)
3191 {
3192 int i;
3193 int err;
3194
3195 /* check device map table */
3196 for (i = 0; i < SNDRV_CARDS; i++) {
3197 if (dsp_map[i] < 0 || dsp_map[i] >= SNDRV_PCM_DEVICES) {
3198 pr_err("ALSA: pcm_oss: invalid dsp_map[%d] = %d\n",
3199 i, dsp_map[i]);
3200 dsp_map[i] = 0;
3201 }
3202 if (adsp_map[i] < 0 || adsp_map[i] >= SNDRV_PCM_DEVICES) {
3203 pr_err("ALSA: pcm_oss: invalid adsp_map[%d] = %d\n",
3204 i, adsp_map[i]);
3205 adsp_map[i] = 1;
3206 }
3207 }
3208 if ((err = snd_pcm_notify(&snd_pcm_oss_notify, 0)) < 0)
3209 return err;
3210 return 0;
3211 }
3212
alsa_pcm_oss_exit(void)3213 static void __exit alsa_pcm_oss_exit(void)
3214 {
3215 snd_pcm_notify(&snd_pcm_oss_notify, 1);
3216 }
3217
3218 module_init(alsa_pcm_oss_init)
3219 module_exit(alsa_pcm_oss_exit)
3220