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 
snd_pcm_oss_release_buffers(struct snd_pcm_substream * substream)845 static void snd_pcm_oss_release_buffers(struct snd_pcm_substream *substream)
846 {
847 	struct snd_pcm_runtime *runtime = substream->runtime;
848 
849 	kvfree(runtime->oss.buffer);
850 	runtime->oss.buffer = NULL;
851 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
852 	snd_pcm_oss_plugin_clear(substream);
853 #endif
854 }
855 
856 /* call with params_lock held */
snd_pcm_oss_change_params_locked(struct snd_pcm_substream * substream)857 static int snd_pcm_oss_change_params_locked(struct snd_pcm_substream *substream)
858 {
859 	struct snd_pcm_runtime *runtime = substream->runtime;
860 	struct snd_pcm_hw_params *params, *sparams;
861 	struct snd_pcm_sw_params *sw_params;
862 	ssize_t oss_buffer_size, oss_period_size;
863 	size_t oss_frame_size;
864 	int err;
865 	int direct;
866 	snd_pcm_format_t format, sformat;
867 	int n;
868 	const struct snd_mask *sformat_mask;
869 	struct snd_mask mask;
870 
871 	if (!runtime->oss.params)
872 		return 0;
873 	sw_params = kzalloc(sizeof(*sw_params), GFP_KERNEL);
874 	params = kmalloc(sizeof(*params), GFP_KERNEL);
875 	sparams = kmalloc(sizeof(*sparams), GFP_KERNEL);
876 	if (!sw_params || !params || !sparams) {
877 		err = -ENOMEM;
878 		goto failure;
879 	}
880 
881 	if (atomic_read(&substream->mmap_count))
882 		direct = 1;
883 	else
884 		direct = substream->oss.setup.direct;
885 
886 	_snd_pcm_hw_params_any(sparams);
887 	_snd_pcm_hw_param_setinteger(sparams, SNDRV_PCM_HW_PARAM_PERIODS);
888 	_snd_pcm_hw_param_min(sparams, SNDRV_PCM_HW_PARAM_PERIODS, 2, 0);
889 	snd_mask_none(&mask);
890 	if (atomic_read(&substream->mmap_count))
891 		snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
892 	else {
893 		snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED);
894 		if (!direct)
895 			snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
896 	}
897 	err = snd_pcm_hw_param_mask(substream, sparams, SNDRV_PCM_HW_PARAM_ACCESS, &mask);
898 	if (err < 0) {
899 		pcm_dbg(substream->pcm, "No usable accesses\n");
900 		err = -EINVAL;
901 		goto failure;
902 	}
903 
904 	err = choose_rate(substream, sparams, runtime->oss.rate);
905 	if (err < 0)
906 		goto failure;
907 	err = snd_pcm_hw_param_near(substream, sparams,
908 				    SNDRV_PCM_HW_PARAM_CHANNELS,
909 				    runtime->oss.channels, NULL);
910 	if (err < 0)
911 		goto failure;
912 
913 	format = snd_pcm_oss_format_from(runtime->oss.format);
914 
915 	sformat_mask = hw_param_mask_c(sparams, SNDRV_PCM_HW_PARAM_FORMAT);
916 	if (direct)
917 		sformat = format;
918 	else
919 		sformat = snd_pcm_plug_slave_format(format, sformat_mask);
920 
921 	if ((__force int)sformat < 0 ||
922 	    !snd_mask_test_format(sformat_mask, sformat)) {
923 		pcm_for_each_format(sformat) {
924 			if (snd_mask_test_format(sformat_mask, sformat) &&
925 			    snd_pcm_oss_format_to(sformat) >= 0)
926 				goto format_found;
927 		}
928 		pcm_dbg(substream->pcm, "Cannot find a format!!!\n");
929 		err = -EINVAL;
930 		goto failure;
931 	}
932  format_found:
933 	err = _snd_pcm_hw_param_set(sparams, SNDRV_PCM_HW_PARAM_FORMAT, (__force int)sformat, 0);
934 	if (err < 0)
935 		goto failure;
936 
937 	if (direct) {
938 		memcpy(params, sparams, sizeof(*params));
939 	} else {
940 		_snd_pcm_hw_params_any(params);
941 		_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_ACCESS,
942 				      (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED, 0);
943 		_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_FORMAT,
944 				      (__force int)snd_pcm_oss_format_from(runtime->oss.format), 0);
945 		_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_CHANNELS,
946 				      runtime->oss.channels, 0);
947 		_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_RATE,
948 				      runtime->oss.rate, 0);
949 		pdprintf("client: access = %i, format = %i, channels = %i, rate = %i\n",
950 			 params_access(params), params_format(params),
951 			 params_channels(params), params_rate(params));
952 	}
953 	pdprintf("slave: access = %i, format = %i, channels = %i, rate = %i\n",
954 		 params_access(sparams), params_format(sparams),
955 		 params_channels(sparams), params_rate(sparams));
956 
957 	oss_frame_size = snd_pcm_format_physical_width(params_format(params)) *
958 			 params_channels(params) / 8;
959 
960 	err = snd_pcm_oss_period_size(substream, params, sparams);
961 	if (err < 0)
962 		goto failure;
963 
964 	n = snd_pcm_plug_slave_size(substream, runtime->oss.period_bytes / oss_frame_size);
965 	err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, n, NULL);
966 	if (err < 0)
967 		goto failure;
968 
969 	err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIODS,
970 				     runtime->oss.periods, NULL);
971 	if (err < 0)
972 		goto failure;
973 
974 	snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
975 
976 	err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_HW_PARAMS, sparams);
977 	if (err < 0) {
978 		pcm_dbg(substream->pcm, "HW_PARAMS failed: %i\n", err);
979 		goto failure;
980 	}
981 
982 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
983 	snd_pcm_oss_plugin_clear(substream);
984 	if (!direct) {
985 		/* add necessary plugins */
986 		err = snd_pcm_plug_format_plugins(substream, params, sparams);
987 		if (err < 0) {
988 			pcm_dbg(substream->pcm,
989 				"snd_pcm_plug_format_plugins failed: %i\n", err);
990 			goto failure;
991 		}
992 		if (runtime->oss.plugin_first) {
993 			struct snd_pcm_plugin *plugin;
994 			err = snd_pcm_plugin_build_io(substream, sparams, &plugin);
995 			if (err < 0) {
996 				pcm_dbg(substream->pcm,
997 					"snd_pcm_plugin_build_io failed: %i\n", err);
998 				goto failure;
999 			}
1000 			if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1001 				err = snd_pcm_plugin_append(plugin);
1002 			} else {
1003 				err = snd_pcm_plugin_insert(plugin);
1004 			}
1005 			if (err < 0)
1006 				goto failure;
1007 		}
1008 	}
1009 #endif
1010 
1011 	if (runtime->oss.trigger) {
1012 		sw_params->start_threshold = 1;
1013 	} else {
1014 		sw_params->start_threshold = runtime->boundary;
1015 	}
1016 	if (atomic_read(&substream->mmap_count) ||
1017 	    substream->stream == SNDRV_PCM_STREAM_CAPTURE)
1018 		sw_params->stop_threshold = runtime->boundary;
1019 	else
1020 		sw_params->stop_threshold = runtime->buffer_size;
1021 	sw_params->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
1022 	sw_params->period_step = 1;
1023 	sw_params->avail_min = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
1024 		1 : runtime->period_size;
1025 	if (atomic_read(&substream->mmap_count) ||
1026 	    substream->oss.setup.nosilence) {
1027 		sw_params->silence_threshold = 0;
1028 		sw_params->silence_size = 0;
1029 	} else {
1030 		snd_pcm_uframes_t frames;
1031 		frames = runtime->period_size + 16;
1032 		if (frames > runtime->buffer_size)
1033 			frames = runtime->buffer_size;
1034 		sw_params->silence_threshold = frames;
1035 		sw_params->silence_size = frames;
1036 	}
1037 
1038 	err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_SW_PARAMS, sw_params);
1039 	if (err < 0) {
1040 		pcm_dbg(substream->pcm, "SW_PARAMS failed: %i\n", err);
1041 		goto failure;
1042 	}
1043 
1044 	runtime->oss.periods = params_periods(sparams);
1045 	oss_period_size = snd_pcm_plug_client_size(substream, params_period_size(sparams));
1046 	if (oss_period_size < 0) {
1047 		err = -EINVAL;
1048 		goto failure;
1049 	}
1050 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1051 	if (runtime->oss.plugin_first) {
1052 		err = snd_pcm_plug_alloc(substream, oss_period_size);
1053 		if (err < 0)
1054 			goto failure;
1055 	}
1056 #endif
1057 	oss_period_size = array_size(oss_period_size, oss_frame_size);
1058 	oss_buffer_size = array_size(oss_period_size, runtime->oss.periods);
1059 	if (oss_buffer_size <= 0) {
1060 		err = -EINVAL;
1061 		goto failure;
1062 	}
1063 
1064 	runtime->oss.period_bytes = oss_period_size;
1065 	runtime->oss.buffer_bytes = oss_buffer_size;
1066 
1067 	pdprintf("oss: period bytes = %i, buffer bytes = %i\n",
1068 		 runtime->oss.period_bytes,
1069 		 runtime->oss.buffer_bytes);
1070 	pdprintf("slave: period_size = %i, buffer_size = %i\n",
1071 		 params_period_size(sparams),
1072 		 params_buffer_size(sparams));
1073 
1074 	runtime->oss.format = snd_pcm_oss_format_to(params_format(params));
1075 	runtime->oss.channels = params_channels(params);
1076 	runtime->oss.rate = params_rate(params);
1077 
1078 	kvfree(runtime->oss.buffer);
1079 	runtime->oss.buffer = kvzalloc(runtime->oss.period_bytes, GFP_KERNEL);
1080 	if (!runtime->oss.buffer) {
1081 		err = -ENOMEM;
1082 		goto failure;
1083 	}
1084 
1085 	runtime->oss.params = 0;
1086 	runtime->oss.prepare = 1;
1087 	runtime->oss.buffer_used = 0;
1088 	if (runtime->dma_area)
1089 		snd_pcm_format_set_silence(runtime->format, runtime->dma_area, bytes_to_samples(runtime, runtime->dma_bytes));
1090 
1091 	runtime->oss.period_frames = snd_pcm_alsa_frames(substream, oss_period_size);
1092 
1093 	err = 0;
1094 failure:
1095 	if (err)
1096 		snd_pcm_oss_release_buffers(substream);
1097 	kfree(sw_params);
1098 	kfree(params);
1099 	kfree(sparams);
1100 	return err;
1101 }
1102 
1103 /* this one takes the lock by itself */
snd_pcm_oss_change_params(struct snd_pcm_substream * substream,bool trylock)1104 static int snd_pcm_oss_change_params(struct snd_pcm_substream *substream,
1105 				     bool trylock)
1106 {
1107 	struct snd_pcm_runtime *runtime = substream->runtime;
1108 	int err;
1109 
1110 	if (trylock) {
1111 		if (!(mutex_trylock(&runtime->oss.params_lock)))
1112 			return -EAGAIN;
1113 	} else if (mutex_lock_interruptible(&runtime->oss.params_lock))
1114 		return -ERESTARTSYS;
1115 
1116 	err = snd_pcm_oss_change_params_locked(substream);
1117 	mutex_unlock(&runtime->oss.params_lock);
1118 	return err;
1119 }
1120 
snd_pcm_oss_get_active_substream(struct snd_pcm_oss_file * pcm_oss_file,struct snd_pcm_substream ** r_substream)1121 static int snd_pcm_oss_get_active_substream(struct snd_pcm_oss_file *pcm_oss_file, struct snd_pcm_substream **r_substream)
1122 {
1123 	int idx, err;
1124 	struct snd_pcm_substream *asubstream = NULL, *substream;
1125 
1126 	for (idx = 0; idx < 2; idx++) {
1127 		substream = pcm_oss_file->streams[idx];
1128 		if (substream == NULL)
1129 			continue;
1130 		if (asubstream == NULL)
1131 			asubstream = substream;
1132 		if (substream->runtime->oss.params) {
1133 			err = snd_pcm_oss_change_params(substream, false);
1134 			if (err < 0)
1135 				return err;
1136 		}
1137 	}
1138 	if (!asubstream)
1139 		return -EIO;
1140 	if (r_substream)
1141 		*r_substream = asubstream;
1142 	return 0;
1143 }
1144 
1145 /* call with params_lock held */
1146 /* NOTE: this always call PREPARE unconditionally no matter whether
1147  * runtime->oss.prepare is set or not
1148  */
snd_pcm_oss_prepare(struct snd_pcm_substream * substream)1149 static int snd_pcm_oss_prepare(struct snd_pcm_substream *substream)
1150 {
1151 	int err;
1152 	struct snd_pcm_runtime *runtime = substream->runtime;
1153 
1154 	err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PREPARE, NULL);
1155 	if (err < 0) {
1156 		pcm_dbg(substream->pcm,
1157 			"snd_pcm_oss_prepare: SNDRV_PCM_IOCTL_PREPARE failed\n");
1158 		return err;
1159 	}
1160 	runtime->oss.prepare = 0;
1161 	runtime->oss.prev_hw_ptr_period = 0;
1162 	runtime->oss.period_ptr = 0;
1163 	runtime->oss.buffer_used = 0;
1164 
1165 	return 0;
1166 }
1167 
snd_pcm_oss_make_ready(struct snd_pcm_substream * substream)1168 static int snd_pcm_oss_make_ready(struct snd_pcm_substream *substream)
1169 {
1170 	struct snd_pcm_runtime *runtime;
1171 	int err;
1172 
1173 	runtime = substream->runtime;
1174 	if (runtime->oss.params) {
1175 		err = snd_pcm_oss_change_params(substream, false);
1176 		if (err < 0)
1177 			return err;
1178 	}
1179 	if (runtime->oss.prepare) {
1180 		if (mutex_lock_interruptible(&runtime->oss.params_lock))
1181 			return -ERESTARTSYS;
1182 		err = snd_pcm_oss_prepare(substream);
1183 		mutex_unlock(&runtime->oss.params_lock);
1184 		if (err < 0)
1185 			return err;
1186 	}
1187 	return 0;
1188 }
1189 
1190 /* call with params_lock held */
snd_pcm_oss_make_ready_locked(struct snd_pcm_substream * substream)1191 static int snd_pcm_oss_make_ready_locked(struct snd_pcm_substream *substream)
1192 {
1193 	struct snd_pcm_runtime *runtime;
1194 	int err;
1195 
1196 	runtime = substream->runtime;
1197 	if (runtime->oss.params) {
1198 		err = snd_pcm_oss_change_params_locked(substream);
1199 		if (err < 0)
1200 			return err;
1201 	}
1202 	if (runtime->oss.prepare) {
1203 		err = snd_pcm_oss_prepare(substream);
1204 		if (err < 0)
1205 			return err;
1206 	}
1207 	return 0;
1208 }
1209 
snd_pcm_oss_capture_position_fixup(struct snd_pcm_substream * substream,snd_pcm_sframes_t * delay)1210 static int snd_pcm_oss_capture_position_fixup(struct snd_pcm_substream *substream, snd_pcm_sframes_t *delay)
1211 {
1212 	struct snd_pcm_runtime *runtime;
1213 	snd_pcm_uframes_t frames;
1214 	int err = 0;
1215 
1216 	while (1) {
1217 		err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, delay);
1218 		if (err < 0)
1219 			break;
1220 		runtime = substream->runtime;
1221 		if (*delay <= (snd_pcm_sframes_t)runtime->buffer_size)
1222 			break;
1223 		/* in case of overrun, skip whole periods like OSS/Linux driver does */
1224 		/* until avail(delay) <= buffer_size */
1225 		frames = (*delay - runtime->buffer_size) + runtime->period_size - 1;
1226 		frames /= runtime->period_size;
1227 		frames *= runtime->period_size;
1228 		err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_FORWARD, &frames);
1229 		if (err < 0)
1230 			break;
1231 	}
1232 	return err;
1233 }
1234 
snd_pcm_oss_write3(struct snd_pcm_substream * substream,const char * ptr,snd_pcm_uframes_t frames,int in_kernel)1235 snd_pcm_sframes_t snd_pcm_oss_write3(struct snd_pcm_substream *substream, const char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1236 {
1237 	struct snd_pcm_runtime *runtime = substream->runtime;
1238 	int ret;
1239 	while (1) {
1240 		if (runtime->state == SNDRV_PCM_STATE_XRUN ||
1241 		    runtime->state == SNDRV_PCM_STATE_SUSPENDED) {
1242 #ifdef OSS_DEBUG
1243 			pcm_dbg(substream->pcm,
1244 				"pcm_oss: write: recovering from %s\n",
1245 				runtime->state == SNDRV_PCM_STATE_XRUN ?
1246 				"XRUN" : "SUSPEND");
1247 #endif
1248 			ret = snd_pcm_oss_prepare(substream);
1249 			if (ret < 0)
1250 				break;
1251 		}
1252 		mutex_unlock(&runtime->oss.params_lock);
1253 		ret = __snd_pcm_lib_xfer(substream, (void *)ptr, true,
1254 					 frames, in_kernel);
1255 		mutex_lock(&runtime->oss.params_lock);
1256 		if (ret != -EPIPE && ret != -ESTRPIPE)
1257 			break;
1258 		/* test, if we can't store new data, because the stream */
1259 		/* has not been started */
1260 		if (runtime->state == SNDRV_PCM_STATE_PREPARED)
1261 			return -EAGAIN;
1262 	}
1263 	return ret;
1264 }
1265 
snd_pcm_oss_read3(struct snd_pcm_substream * substream,char * ptr,snd_pcm_uframes_t frames,int in_kernel)1266 snd_pcm_sframes_t snd_pcm_oss_read3(struct snd_pcm_substream *substream, char *ptr, snd_pcm_uframes_t frames, int in_kernel)
1267 {
1268 	struct snd_pcm_runtime *runtime = substream->runtime;
1269 	snd_pcm_sframes_t delay;
1270 	int ret;
1271 	while (1) {
1272 		if (runtime->state == SNDRV_PCM_STATE_XRUN ||
1273 		    runtime->state == SNDRV_PCM_STATE_SUSPENDED) {
1274 #ifdef OSS_DEBUG
1275 			pcm_dbg(substream->pcm,
1276 				"pcm_oss: read: recovering from %s\n",
1277 				runtime->state == SNDRV_PCM_STATE_XRUN ?
1278 				"XRUN" : "SUSPEND");
1279 #endif
1280 			ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1281 			if (ret < 0)
1282 				break;
1283 		} else if (runtime->state == SNDRV_PCM_STATE_SETUP) {
1284 			ret = snd_pcm_oss_prepare(substream);
1285 			if (ret < 0)
1286 				break;
1287 		}
1288 		ret = snd_pcm_oss_capture_position_fixup(substream, &delay);
1289 		if (ret < 0)
1290 			break;
1291 		mutex_unlock(&runtime->oss.params_lock);
1292 		ret = __snd_pcm_lib_xfer(substream, (void *)ptr, true,
1293 					 frames, in_kernel);
1294 		mutex_lock(&runtime->oss.params_lock);
1295 		if (ret == -EPIPE) {
1296 			if (runtime->state == SNDRV_PCM_STATE_DRAINING) {
1297 				ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1298 				if (ret < 0)
1299 					break;
1300 			}
1301 			continue;
1302 		}
1303 		if (ret != -ESTRPIPE)
1304 			break;
1305 	}
1306 	return ret;
1307 }
1308 
1309 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
snd_pcm_oss_writev3(struct snd_pcm_substream * substream,void ** bufs,snd_pcm_uframes_t frames)1310 snd_pcm_sframes_t snd_pcm_oss_writev3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames)
1311 {
1312 	struct snd_pcm_runtime *runtime = substream->runtime;
1313 	int ret;
1314 	while (1) {
1315 		if (runtime->state == SNDRV_PCM_STATE_XRUN ||
1316 		    runtime->state == SNDRV_PCM_STATE_SUSPENDED) {
1317 #ifdef OSS_DEBUG
1318 			pcm_dbg(substream->pcm,
1319 				"pcm_oss: writev: recovering from %s\n",
1320 				runtime->state == SNDRV_PCM_STATE_XRUN ?
1321 				"XRUN" : "SUSPEND");
1322 #endif
1323 			ret = snd_pcm_oss_prepare(substream);
1324 			if (ret < 0)
1325 				break;
1326 		}
1327 		ret = snd_pcm_kernel_writev(substream, bufs, frames);
1328 		if (ret != -EPIPE && ret != -ESTRPIPE)
1329 			break;
1330 
1331 		/* test, if we can't store new data, because the stream */
1332 		/* has not been started */
1333 		if (runtime->state == SNDRV_PCM_STATE_PREPARED)
1334 			return -EAGAIN;
1335 	}
1336 	return ret;
1337 }
1338 
snd_pcm_oss_readv3(struct snd_pcm_substream * substream,void ** bufs,snd_pcm_uframes_t frames)1339 snd_pcm_sframes_t snd_pcm_oss_readv3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames)
1340 {
1341 	struct snd_pcm_runtime *runtime = substream->runtime;
1342 	int ret;
1343 	while (1) {
1344 		if (runtime->state == SNDRV_PCM_STATE_XRUN ||
1345 		    runtime->state == SNDRV_PCM_STATE_SUSPENDED) {
1346 #ifdef OSS_DEBUG
1347 			pcm_dbg(substream->pcm,
1348 				"pcm_oss: readv: recovering from %s\n",
1349 				runtime->state == SNDRV_PCM_STATE_XRUN ?
1350 				"XRUN" : "SUSPEND");
1351 #endif
1352 			ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1353 			if (ret < 0)
1354 				break;
1355 		} else if (runtime->state == SNDRV_PCM_STATE_SETUP) {
1356 			ret = snd_pcm_oss_prepare(substream);
1357 			if (ret < 0)
1358 				break;
1359 		}
1360 		ret = snd_pcm_kernel_readv(substream, bufs, frames);
1361 		if (ret != -EPIPE && ret != -ESTRPIPE)
1362 			break;
1363 	}
1364 	return ret;
1365 }
1366 #endif /* CONFIG_SND_PCM_OSS_PLUGINS */
1367 
snd_pcm_oss_write2(struct snd_pcm_substream * substream,const char * buf,size_t bytes,int in_kernel)1368 static ssize_t snd_pcm_oss_write2(struct snd_pcm_substream *substream, const char *buf, size_t bytes, int in_kernel)
1369 {
1370 	struct snd_pcm_runtime *runtime = substream->runtime;
1371 	snd_pcm_sframes_t frames, frames1;
1372 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1373 	if (runtime->oss.plugin_first) {
1374 		struct snd_pcm_plugin_channel *channels;
1375 		size_t oss_frame_bytes = (runtime->oss.plugin_first->src_width * runtime->oss.plugin_first->src_format.channels) / 8;
1376 		if (!in_kernel) {
1377 			if (copy_from_user(runtime->oss.buffer, (const char __force __user *)buf, bytes))
1378 				return -EFAULT;
1379 			buf = runtime->oss.buffer;
1380 		}
1381 		frames = bytes / oss_frame_bytes;
1382 		frames1 = snd_pcm_plug_client_channels_buf(substream, (char *)buf, frames, &channels);
1383 		if (frames1 < 0)
1384 			return frames1;
1385 		frames1 = snd_pcm_plug_write_transfer(substream, channels, frames1);
1386 		if (frames1 <= 0)
1387 			return frames1;
1388 		bytes = frames1 * oss_frame_bytes;
1389 	} else
1390 #endif
1391 	{
1392 		frames = bytes_to_frames(runtime, bytes);
1393 		frames1 = snd_pcm_oss_write3(substream, buf, frames, in_kernel);
1394 		if (frames1 <= 0)
1395 			return frames1;
1396 		bytes = frames_to_bytes(runtime, frames1);
1397 	}
1398 	return bytes;
1399 }
1400 
snd_pcm_oss_write1(struct snd_pcm_substream * substream,const char __user * buf,size_t bytes)1401 static ssize_t snd_pcm_oss_write1(struct snd_pcm_substream *substream, const char __user *buf, size_t bytes)
1402 {
1403 	size_t xfer = 0;
1404 	ssize_t tmp = 0;
1405 	struct snd_pcm_runtime *runtime = substream->runtime;
1406 
1407 	if (atomic_read(&substream->mmap_count))
1408 		return -ENXIO;
1409 
1410 	atomic_inc(&runtime->oss.rw_ref);
1411 	while (bytes > 0) {
1412 		if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1413 			tmp = -ERESTARTSYS;
1414 			break;
1415 		}
1416 		tmp = snd_pcm_oss_make_ready_locked(substream);
1417 		if (tmp < 0)
1418 			goto err;
1419 		if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1420 			tmp = bytes;
1421 			if (tmp + runtime->oss.buffer_used > runtime->oss.period_bytes)
1422 				tmp = runtime->oss.period_bytes - runtime->oss.buffer_used;
1423 			if (tmp > 0) {
1424 				if (copy_from_user(runtime->oss.buffer + runtime->oss.buffer_used, buf, tmp)) {
1425 					tmp = -EFAULT;
1426 					goto err;
1427 				}
1428 			}
1429 			runtime->oss.buffer_used += tmp;
1430 			buf += tmp;
1431 			bytes -= tmp;
1432 			xfer += tmp;
1433 			if (substream->oss.setup.partialfrag ||
1434 			    runtime->oss.buffer_used == runtime->oss.period_bytes) {
1435 				tmp = snd_pcm_oss_write2(substream, runtime->oss.buffer + runtime->oss.period_ptr,
1436 							 runtime->oss.buffer_used - runtime->oss.period_ptr, 1);
1437 				if (tmp <= 0)
1438 					goto err;
1439 				runtime->oss.bytes += tmp;
1440 				runtime->oss.period_ptr += tmp;
1441 				runtime->oss.period_ptr %= runtime->oss.period_bytes;
1442 				if (runtime->oss.period_ptr == 0 ||
1443 				    runtime->oss.period_ptr == runtime->oss.buffer_used)
1444 					runtime->oss.buffer_used = 0;
1445 				else if ((substream->f_flags & O_NONBLOCK) != 0) {
1446 					tmp = -EAGAIN;
1447 					goto err;
1448 				}
1449 			}
1450 		} else {
1451 			tmp = snd_pcm_oss_write2(substream,
1452 						 (const char __force *)buf,
1453 						 runtime->oss.period_bytes, 0);
1454 			if (tmp <= 0)
1455 				goto err;
1456 			runtime->oss.bytes += tmp;
1457 			buf += tmp;
1458 			bytes -= tmp;
1459 			xfer += tmp;
1460 			if ((substream->f_flags & O_NONBLOCK) != 0 &&
1461 			    tmp != runtime->oss.period_bytes)
1462 				tmp = -EAGAIN;
1463 		}
1464  err:
1465 		mutex_unlock(&runtime->oss.params_lock);
1466 		if (tmp < 0)
1467 			break;
1468 		if (signal_pending(current)) {
1469 			tmp = -ERESTARTSYS;
1470 			break;
1471 		}
1472 		tmp = 0;
1473 	}
1474 	atomic_dec(&runtime->oss.rw_ref);
1475 	return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1476 }
1477 
snd_pcm_oss_read2(struct snd_pcm_substream * substream,char * buf,size_t bytes,int in_kernel)1478 static ssize_t snd_pcm_oss_read2(struct snd_pcm_substream *substream, char *buf, size_t bytes, int in_kernel)
1479 {
1480 	struct snd_pcm_runtime *runtime = substream->runtime;
1481 	snd_pcm_sframes_t frames, frames1;
1482 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
1483 	char __user *final_dst = (char __force __user *)buf;
1484 	if (runtime->oss.plugin_first) {
1485 		struct snd_pcm_plugin_channel *channels;
1486 		size_t oss_frame_bytes = (runtime->oss.plugin_last->dst_width * runtime->oss.plugin_last->dst_format.channels) / 8;
1487 		if (!in_kernel)
1488 			buf = runtime->oss.buffer;
1489 		frames = bytes / oss_frame_bytes;
1490 		frames1 = snd_pcm_plug_client_channels_buf(substream, buf, frames, &channels);
1491 		if (frames1 < 0)
1492 			return frames1;
1493 		frames1 = snd_pcm_plug_read_transfer(substream, channels, frames1);
1494 		if (frames1 <= 0)
1495 			return frames1;
1496 		bytes = frames1 * oss_frame_bytes;
1497 		if (!in_kernel && copy_to_user(final_dst, buf, bytes))
1498 			return -EFAULT;
1499 	} else
1500 #endif
1501 	{
1502 		frames = bytes_to_frames(runtime, bytes);
1503 		frames1 = snd_pcm_oss_read3(substream, buf, frames, in_kernel);
1504 		if (frames1 <= 0)
1505 			return frames1;
1506 		bytes = frames_to_bytes(runtime, frames1);
1507 	}
1508 	return bytes;
1509 }
1510 
snd_pcm_oss_read1(struct snd_pcm_substream * substream,char __user * buf,size_t bytes)1511 static ssize_t snd_pcm_oss_read1(struct snd_pcm_substream *substream, char __user *buf, size_t bytes)
1512 {
1513 	size_t xfer = 0;
1514 	ssize_t tmp = 0;
1515 	struct snd_pcm_runtime *runtime = substream->runtime;
1516 
1517 	if (atomic_read(&substream->mmap_count))
1518 		return -ENXIO;
1519 
1520 	atomic_inc(&runtime->oss.rw_ref);
1521 	while (bytes > 0) {
1522 		if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1523 			tmp = -ERESTARTSYS;
1524 			break;
1525 		}
1526 		tmp = snd_pcm_oss_make_ready_locked(substream);
1527 		if (tmp < 0)
1528 			goto err;
1529 		if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
1530 			if (runtime->oss.buffer_used == 0) {
1531 				tmp = snd_pcm_oss_read2(substream, runtime->oss.buffer, runtime->oss.period_bytes, 1);
1532 				if (tmp <= 0)
1533 					goto err;
1534 				runtime->oss.bytes += tmp;
1535 				runtime->oss.period_ptr = tmp;
1536 				runtime->oss.buffer_used = tmp;
1537 			}
1538 			tmp = bytes;
1539 			if ((size_t) tmp > runtime->oss.buffer_used)
1540 				tmp = runtime->oss.buffer_used;
1541 			if (copy_to_user(buf, runtime->oss.buffer + (runtime->oss.period_ptr - runtime->oss.buffer_used), tmp)) {
1542 				tmp = -EFAULT;
1543 				goto err;
1544 			}
1545 			buf += tmp;
1546 			bytes -= tmp;
1547 			xfer += tmp;
1548 			runtime->oss.buffer_used -= tmp;
1549 		} else {
1550 			tmp = snd_pcm_oss_read2(substream, (char __force *)buf,
1551 						runtime->oss.period_bytes, 0);
1552 			if (tmp <= 0)
1553 				goto err;
1554 			runtime->oss.bytes += tmp;
1555 			buf += tmp;
1556 			bytes -= tmp;
1557 			xfer += tmp;
1558 		}
1559  err:
1560 		mutex_unlock(&runtime->oss.params_lock);
1561 		if (tmp < 0)
1562 			break;
1563 		if (signal_pending(current)) {
1564 			tmp = -ERESTARTSYS;
1565 			break;
1566 		}
1567 		tmp = 0;
1568 	}
1569 	atomic_dec(&runtime->oss.rw_ref);
1570 	return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;
1571 }
1572 
snd_pcm_oss_reset(struct snd_pcm_oss_file * pcm_oss_file)1573 static int snd_pcm_oss_reset(struct snd_pcm_oss_file *pcm_oss_file)
1574 {
1575 	struct snd_pcm_substream *substream;
1576 	struct snd_pcm_runtime *runtime;
1577 	int i;
1578 
1579 	for (i = 0; i < 2; i++) {
1580 		substream = pcm_oss_file->streams[i];
1581 		if (!substream)
1582 			continue;
1583 		runtime = substream->runtime;
1584 		snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1585 		mutex_lock(&runtime->oss.params_lock);
1586 		runtime->oss.prepare = 1;
1587 		runtime->oss.buffer_used = 0;
1588 		runtime->oss.prev_hw_ptr_period = 0;
1589 		runtime->oss.period_ptr = 0;
1590 		mutex_unlock(&runtime->oss.params_lock);
1591 	}
1592 	return 0;
1593 }
1594 
snd_pcm_oss_post(struct snd_pcm_oss_file * pcm_oss_file)1595 static int snd_pcm_oss_post(struct snd_pcm_oss_file *pcm_oss_file)
1596 {
1597 	struct snd_pcm_substream *substream;
1598 	int err;
1599 
1600 	substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1601 	if (substream != NULL) {
1602 		err = snd_pcm_oss_make_ready(substream);
1603 		if (err < 0)
1604 			return err;
1605 		snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_START, NULL);
1606 	}
1607 	/* note: all errors from the start action are ignored */
1608 	/* OSS apps do not know, how to handle them */
1609 	return 0;
1610 }
1611 
snd_pcm_oss_sync1(struct snd_pcm_substream * substream,size_t size)1612 static int snd_pcm_oss_sync1(struct snd_pcm_substream *substream, size_t size)
1613 {
1614 	struct snd_pcm_runtime *runtime;
1615 	ssize_t result = 0;
1616 	snd_pcm_state_t state;
1617 	long res;
1618 	wait_queue_entry_t wait;
1619 
1620 	runtime = substream->runtime;
1621 	init_waitqueue_entry(&wait, current);
1622 	add_wait_queue(&runtime->sleep, &wait);
1623 #ifdef OSS_DEBUG
1624 	pcm_dbg(substream->pcm, "sync1: size = %li\n", size);
1625 #endif
1626 	while (1) {
1627 		result = snd_pcm_oss_write2(substream, runtime->oss.buffer, size, 1);
1628 		if (result > 0) {
1629 			runtime->oss.buffer_used = 0;
1630 			result = 0;
1631 			break;
1632 		}
1633 		if (result != 0 && result != -EAGAIN)
1634 			break;
1635 		result = 0;
1636 		set_current_state(TASK_INTERRUPTIBLE);
1637 		snd_pcm_stream_lock_irq(substream);
1638 		state = runtime->state;
1639 		snd_pcm_stream_unlock_irq(substream);
1640 		if (state != SNDRV_PCM_STATE_RUNNING) {
1641 			set_current_state(TASK_RUNNING);
1642 			break;
1643 		}
1644 		res = schedule_timeout(10 * HZ);
1645 		if (signal_pending(current)) {
1646 			result = -ERESTARTSYS;
1647 			break;
1648 		}
1649 		if (res == 0) {
1650 			pcm_err(substream->pcm,
1651 				"OSS sync error - DMA timeout\n");
1652 			result = -EIO;
1653 			break;
1654 		}
1655 	}
1656 	remove_wait_queue(&runtime->sleep, &wait);
1657 	return result;
1658 }
1659 
snd_pcm_oss_sync(struct snd_pcm_oss_file * pcm_oss_file)1660 static int snd_pcm_oss_sync(struct snd_pcm_oss_file *pcm_oss_file)
1661 {
1662 	int err = 0;
1663 	unsigned int saved_f_flags;
1664 	struct snd_pcm_substream *substream;
1665 	struct snd_pcm_runtime *runtime;
1666 	snd_pcm_format_t format;
1667 	unsigned long width;
1668 	size_t size;
1669 
1670 	substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
1671 	if (substream != NULL) {
1672 		runtime = substream->runtime;
1673 		if (atomic_read(&substream->mmap_count))
1674 			goto __direct;
1675 		atomic_inc(&runtime->oss.rw_ref);
1676 		if (mutex_lock_interruptible(&runtime->oss.params_lock)) {
1677 			atomic_dec(&runtime->oss.rw_ref);
1678 			return -ERESTARTSYS;
1679 		}
1680 		err = snd_pcm_oss_make_ready_locked(substream);
1681 		if (err < 0)
1682 			goto unlock;
1683 		format = snd_pcm_oss_format_from(runtime->oss.format);
1684 		width = snd_pcm_format_physical_width(format);
1685 		if (runtime->oss.buffer_used > 0) {
1686 #ifdef OSS_DEBUG
1687 			pcm_dbg(substream->pcm, "sync: buffer_used\n");
1688 #endif
1689 			size = (8 * (runtime->oss.period_bytes - runtime->oss.buffer_used) + 7) / width;
1690 			snd_pcm_format_set_silence(format,
1691 						   runtime->oss.buffer + runtime->oss.buffer_used,
1692 						   size);
1693 			err = snd_pcm_oss_sync1(substream, runtime->oss.period_bytes);
1694 			if (err < 0)
1695 				goto unlock;
1696 		} else if (runtime->oss.period_ptr > 0) {
1697 #ifdef OSS_DEBUG
1698 			pcm_dbg(substream->pcm, "sync: period_ptr\n");
1699 #endif
1700 			size = runtime->oss.period_bytes - runtime->oss.period_ptr;
1701 			snd_pcm_format_set_silence(format,
1702 						   runtime->oss.buffer,
1703 						   size * 8 / width);
1704 			err = snd_pcm_oss_sync1(substream, size);
1705 			if (err < 0)
1706 				goto unlock;
1707 		}
1708 		/*
1709 		 * The ALSA's period might be a bit large than OSS one.
1710 		 * Fill the remain portion of ALSA period with zeros.
1711 		 */
1712 		size = runtime->control->appl_ptr % runtime->period_size;
1713 		if (size > 0) {
1714 			size = runtime->period_size - size;
1715 			if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED)
1716 				snd_pcm_lib_write(substream, NULL, size);
1717 			else if (runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
1718 				snd_pcm_lib_writev(substream, NULL, size);
1719 		}
1720 unlock:
1721 		mutex_unlock(&runtime->oss.params_lock);
1722 		atomic_dec(&runtime->oss.rw_ref);
1723 		if (err < 0)
1724 			return err;
1725 		/*
1726 		 * finish sync: drain the buffer
1727 		 */
1728 	      __direct:
1729 		saved_f_flags = substream->f_flags;
1730 		substream->f_flags &= ~O_NONBLOCK;
1731 		err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
1732 		substream->f_flags = saved_f_flags;
1733 		if (err < 0)
1734 			return err;
1735 		mutex_lock(&runtime->oss.params_lock);
1736 		runtime->oss.prepare = 1;
1737 		mutex_unlock(&runtime->oss.params_lock);
1738 	}
1739 
1740 	substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
1741 	if (substream != NULL) {
1742 		err = snd_pcm_oss_make_ready(substream);
1743 		if (err < 0)
1744 			return err;
1745 		runtime = substream->runtime;
1746 		err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
1747 		if (err < 0)
1748 			return err;
1749 		mutex_lock(&runtime->oss.params_lock);
1750 		runtime->oss.buffer_used = 0;
1751 		runtime->oss.prepare = 1;
1752 		mutex_unlock(&runtime->oss.params_lock);
1753 	}
1754 	return 0;
1755 }
1756 
snd_pcm_oss_set_rate(struct snd_pcm_oss_file * pcm_oss_file,int rate)1757 static int snd_pcm_oss_set_rate(struct snd_pcm_oss_file *pcm_oss_file, int rate)
1758 {
1759 	int idx;
1760 
1761 	for (idx = 1; idx >= 0; --idx) {
1762 		struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1763 		struct snd_pcm_runtime *runtime;
1764 		int err;
1765 
1766 		if (substream == NULL)
1767 			continue;
1768 		runtime = substream->runtime;
1769 		if (rate < 1000)
1770 			rate = 1000;
1771 		else if (rate > 192000)
1772 			rate = 192000;
1773 		err = lock_params(runtime);
1774 		if (err < 0)
1775 			return err;
1776 		if (runtime->oss.rate != rate) {
1777 			runtime->oss.params = 1;
1778 			runtime->oss.rate = rate;
1779 		}
1780 		unlock_params(runtime);
1781 	}
1782 	return snd_pcm_oss_get_rate(pcm_oss_file);
1783 }
1784 
snd_pcm_oss_get_rate(struct snd_pcm_oss_file * pcm_oss_file)1785 static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file)
1786 {
1787 	struct snd_pcm_substream *substream;
1788 	int err;
1789 
1790 	err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream);
1791 	if (err < 0)
1792 		return err;
1793 	return substream->runtime->oss.rate;
1794 }
1795 
snd_pcm_oss_set_channels(struct snd_pcm_oss_file * pcm_oss_file,unsigned int channels)1796 static int snd_pcm_oss_set_channels(struct snd_pcm_oss_file *pcm_oss_file, unsigned int channels)
1797 {
1798 	int idx;
1799 	if (channels < 1)
1800 		channels = 1;
1801 	if (channels > 128)
1802 		return -EINVAL;
1803 	for (idx = 1; idx >= 0; --idx) {
1804 		struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1805 		struct snd_pcm_runtime *runtime;
1806 		int err;
1807 
1808 		if (substream == NULL)
1809 			continue;
1810 		runtime = substream->runtime;
1811 		err = lock_params(runtime);
1812 		if (err < 0)
1813 			return err;
1814 		if (runtime->oss.channels != channels) {
1815 			runtime->oss.params = 1;
1816 			runtime->oss.channels = channels;
1817 		}
1818 		unlock_params(runtime);
1819 	}
1820 	return snd_pcm_oss_get_channels(pcm_oss_file);
1821 }
1822 
snd_pcm_oss_get_channels(struct snd_pcm_oss_file * pcm_oss_file)1823 static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file)
1824 {
1825 	struct snd_pcm_substream *substream;
1826 	int err;
1827 
1828 	err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream);
1829 	if (err < 0)
1830 		return err;
1831 	return substream->runtime->oss.channels;
1832 }
1833 
snd_pcm_oss_get_block_size(struct snd_pcm_oss_file * pcm_oss_file)1834 static int snd_pcm_oss_get_block_size(struct snd_pcm_oss_file *pcm_oss_file)
1835 {
1836 	struct snd_pcm_substream *substream;
1837 	int err;
1838 
1839 	err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream);
1840 	if (err < 0)
1841 		return err;
1842 	return substream->runtime->oss.period_bytes;
1843 }
1844 
snd_pcm_oss_get_formats(struct snd_pcm_oss_file * pcm_oss_file)1845 static int snd_pcm_oss_get_formats(struct snd_pcm_oss_file *pcm_oss_file)
1846 {
1847 	struct snd_pcm_substream *substream;
1848 	int err;
1849 	int direct;
1850 	struct snd_pcm_hw_params *params;
1851 	unsigned int formats = 0;
1852 	const struct snd_mask *format_mask;
1853 	int fmt;
1854 
1855 	err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream);
1856 	if (err < 0)
1857 		return err;
1858 	if (atomic_read(&substream->mmap_count))
1859 		direct = 1;
1860 	else
1861 		direct = substream->oss.setup.direct;
1862 	if (!direct)
1863 		return AFMT_MU_LAW | AFMT_U8 |
1864 		       AFMT_S16_LE | AFMT_S16_BE |
1865 		       AFMT_S8 | AFMT_U16_LE |
1866 		       AFMT_U16_BE |
1867 			AFMT_S32_LE | AFMT_S32_BE |
1868 			AFMT_S24_LE | AFMT_S24_BE |
1869 			AFMT_S24_PACKED;
1870 	params = kmalloc(sizeof(*params), GFP_KERNEL);
1871 	if (!params)
1872 		return -ENOMEM;
1873 	_snd_pcm_hw_params_any(params);
1874 	err = snd_pcm_hw_refine(substream, params);
1875 	if (err < 0)
1876 		goto error;
1877 	format_mask = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
1878 	for (fmt = 0; fmt < 32; ++fmt) {
1879 		if (snd_mask_test(format_mask, fmt)) {
1880 			int f = snd_pcm_oss_format_to((__force snd_pcm_format_t)fmt);
1881 			if (f >= 0)
1882 				formats |= f;
1883 		}
1884 	}
1885 
1886  error:
1887 	kfree(params);
1888 	return err < 0 ? err : formats;
1889 }
1890 
snd_pcm_oss_set_format(struct snd_pcm_oss_file * pcm_oss_file,int format)1891 static int snd_pcm_oss_set_format(struct snd_pcm_oss_file *pcm_oss_file, int format)
1892 {
1893 	int formats, idx;
1894 	int err;
1895 
1896 	if (format != AFMT_QUERY) {
1897 		formats = snd_pcm_oss_get_formats(pcm_oss_file);
1898 		if (formats < 0)
1899 			return formats;
1900 		if (!(formats & format))
1901 			format = AFMT_U8;
1902 		for (idx = 1; idx >= 0; --idx) {
1903 			struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1904 			struct snd_pcm_runtime *runtime;
1905 			if (substream == NULL)
1906 				continue;
1907 			runtime = substream->runtime;
1908 			err = lock_params(runtime);
1909 			if (err < 0)
1910 				return err;
1911 			if (runtime->oss.format != format) {
1912 				runtime->oss.params = 1;
1913 				runtime->oss.format = format;
1914 			}
1915 			unlock_params(runtime);
1916 		}
1917 	}
1918 	return snd_pcm_oss_get_format(pcm_oss_file);
1919 }
1920 
snd_pcm_oss_get_format(struct snd_pcm_oss_file * pcm_oss_file)1921 static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file)
1922 {
1923 	struct snd_pcm_substream *substream;
1924 	int err;
1925 
1926 	err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream);
1927 	if (err < 0)
1928 		return err;
1929 	return substream->runtime->oss.format;
1930 }
1931 
snd_pcm_oss_set_subdivide1(struct snd_pcm_substream * substream,int subdivide)1932 static int snd_pcm_oss_set_subdivide1(struct snd_pcm_substream *substream, int subdivide)
1933 {
1934 	struct snd_pcm_runtime *runtime;
1935 
1936 	runtime = substream->runtime;
1937 	if (subdivide == 0) {
1938 		subdivide = runtime->oss.subdivision;
1939 		if (subdivide == 0)
1940 			subdivide = 1;
1941 		return subdivide;
1942 	}
1943 	if (runtime->oss.subdivision || runtime->oss.fragshift)
1944 		return -EINVAL;
1945 	if (subdivide != 1 && subdivide != 2 && subdivide != 4 &&
1946 	    subdivide != 8 && subdivide != 16)
1947 		return -EINVAL;
1948 	runtime->oss.subdivision = subdivide;
1949 	runtime->oss.params = 1;
1950 	return subdivide;
1951 }
1952 
snd_pcm_oss_set_subdivide(struct snd_pcm_oss_file * pcm_oss_file,int subdivide)1953 static int snd_pcm_oss_set_subdivide(struct snd_pcm_oss_file *pcm_oss_file, int subdivide)
1954 {
1955 	int err = -EINVAL, idx;
1956 
1957 	for (idx = 1; idx >= 0; --idx) {
1958 		struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
1959 		struct snd_pcm_runtime *runtime;
1960 
1961 		if (substream == NULL)
1962 			continue;
1963 		runtime = substream->runtime;
1964 		err = lock_params(runtime);
1965 		if (err < 0)
1966 			return err;
1967 		err = snd_pcm_oss_set_subdivide1(substream, subdivide);
1968 		unlock_params(runtime);
1969 		if (err < 0)
1970 			return err;
1971 	}
1972 	return err;
1973 }
1974 
snd_pcm_oss_set_fragment1(struct snd_pcm_substream * substream,unsigned int val)1975 static int snd_pcm_oss_set_fragment1(struct snd_pcm_substream *substream, unsigned int val)
1976 {
1977 	struct snd_pcm_runtime *runtime;
1978 	int fragshift;
1979 
1980 	runtime = substream->runtime;
1981 	if (runtime->oss.subdivision || runtime->oss.fragshift)
1982 		return -EINVAL;
1983 	fragshift = val & 0xffff;
1984 	if (fragshift >= 25) /* should be large enough */
1985 		return -EINVAL;
1986 	runtime->oss.fragshift = fragshift;
1987 	runtime->oss.maxfrags = (val >> 16) & 0xffff;
1988 	if (runtime->oss.fragshift < 4)		/* < 16 */
1989 		runtime->oss.fragshift = 4;
1990 	if (runtime->oss.maxfrags < 2)
1991 		runtime->oss.maxfrags = 2;
1992 	runtime->oss.params = 1;
1993 	return 0;
1994 }
1995 
snd_pcm_oss_set_fragment(struct snd_pcm_oss_file * pcm_oss_file,unsigned int val)1996 static int snd_pcm_oss_set_fragment(struct snd_pcm_oss_file *pcm_oss_file, unsigned int val)
1997 {
1998 	int err = -EINVAL, idx;
1999 
2000 	for (idx = 1; idx >= 0; --idx) {
2001 		struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
2002 		struct snd_pcm_runtime *runtime;
2003 
2004 		if (substream == NULL)
2005 			continue;
2006 		runtime = substream->runtime;
2007 		err = lock_params(runtime);
2008 		if (err < 0)
2009 			return err;
2010 		err = snd_pcm_oss_set_fragment1(substream, val);
2011 		unlock_params(runtime);
2012 		if (err < 0)
2013 			return err;
2014 	}
2015 	return err;
2016 }
2017 
snd_pcm_oss_nonblock(struct file * file)2018 static int snd_pcm_oss_nonblock(struct file * file)
2019 {
2020 	spin_lock(&file->f_lock);
2021 	file->f_flags |= O_NONBLOCK;
2022 	spin_unlock(&file->f_lock);
2023 	return 0;
2024 }
2025 
snd_pcm_oss_get_caps1(struct snd_pcm_substream * substream,int res)2026 static int snd_pcm_oss_get_caps1(struct snd_pcm_substream *substream, int res)
2027 {
2028 
2029 	if (substream == NULL) {
2030 		res &= ~DSP_CAP_DUPLEX;
2031 		return res;
2032 	}
2033 #ifdef DSP_CAP_MULTI
2034 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2035 		if (substream->pstr->substream_count > 1)
2036 			res |= DSP_CAP_MULTI;
2037 #endif
2038 	/* DSP_CAP_REALTIME is set all times: */
2039 	/* all ALSA drivers can return actual pointer in ring buffer */
2040 #if defined(DSP_CAP_REALTIME) && 0
2041 	{
2042 		struct snd_pcm_runtime *runtime = substream->runtime;
2043 		if (runtime->info & (SNDRV_PCM_INFO_BLOCK_TRANSFER|SNDRV_PCM_INFO_BATCH))
2044 			res &= ~DSP_CAP_REALTIME;
2045 	}
2046 #endif
2047 	return res;
2048 }
2049 
snd_pcm_oss_get_caps(struct snd_pcm_oss_file * pcm_oss_file)2050 static int snd_pcm_oss_get_caps(struct snd_pcm_oss_file *pcm_oss_file)
2051 {
2052 	int result, idx;
2053 
2054 	result = DSP_CAP_TRIGGER | DSP_CAP_MMAP	| DSP_CAP_DUPLEX | DSP_CAP_REALTIME;
2055 	for (idx = 0; idx < 2; idx++) {
2056 		struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
2057 		result = snd_pcm_oss_get_caps1(substream, result);
2058 	}
2059 	result |= 0x0001;	/* revision - same as SB AWE 64 */
2060 	return result;
2061 }
2062 
snd_pcm_oss_simulate_fill(struct snd_pcm_substream * substream,snd_pcm_uframes_t hw_ptr)2063 static void snd_pcm_oss_simulate_fill(struct snd_pcm_substream *substream,
2064 				      snd_pcm_uframes_t hw_ptr)
2065 {
2066 	struct snd_pcm_runtime *runtime = substream->runtime;
2067 	snd_pcm_uframes_t appl_ptr;
2068 	appl_ptr = hw_ptr + runtime->buffer_size;
2069 	appl_ptr %= runtime->boundary;
2070 	runtime->control->appl_ptr = appl_ptr;
2071 }
2072 
snd_pcm_oss_set_trigger(struct snd_pcm_oss_file * pcm_oss_file,int trigger)2073 static int snd_pcm_oss_set_trigger(struct snd_pcm_oss_file *pcm_oss_file, int trigger)
2074 {
2075 	struct snd_pcm_runtime *runtime;
2076 	struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2077 	int err, cmd;
2078 
2079 #ifdef OSS_DEBUG
2080 	pr_debug("pcm_oss: trigger = 0x%x\n", trigger);
2081 #endif
2082 
2083 	psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2084 	csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2085 
2086 	if (psubstream) {
2087 		err = snd_pcm_oss_make_ready(psubstream);
2088 		if (err < 0)
2089 			return err;
2090 	}
2091 	if (csubstream) {
2092 		err = snd_pcm_oss_make_ready(csubstream);
2093 		if (err < 0)
2094 			return err;
2095 	}
2096       	if (psubstream) {
2097       		runtime = psubstream->runtime;
2098 		cmd = 0;
2099 		if (mutex_lock_interruptible(&runtime->oss.params_lock))
2100 			return -ERESTARTSYS;
2101 		if (trigger & PCM_ENABLE_OUTPUT) {
2102 			if (runtime->oss.trigger)
2103 				goto _skip1;
2104 			if (atomic_read(&psubstream->mmap_count))
2105 				snd_pcm_oss_simulate_fill(psubstream,
2106 						get_hw_ptr_period(runtime));
2107 			runtime->oss.trigger = 1;
2108 			runtime->start_threshold = 1;
2109 			cmd = SNDRV_PCM_IOCTL_START;
2110 		} else {
2111 			if (!runtime->oss.trigger)
2112 				goto _skip1;
2113 			runtime->oss.trigger = 0;
2114 			runtime->start_threshold = runtime->boundary;
2115 			cmd = SNDRV_PCM_IOCTL_DROP;
2116 			runtime->oss.prepare = 1;
2117 		}
2118  _skip1:
2119 		mutex_unlock(&runtime->oss.params_lock);
2120 		if (cmd) {
2121 			err = snd_pcm_kernel_ioctl(psubstream, cmd, NULL);
2122 			if (err < 0)
2123 				return err;
2124 		}
2125 	}
2126 	if (csubstream) {
2127       		runtime = csubstream->runtime;
2128 		cmd = 0;
2129 		if (mutex_lock_interruptible(&runtime->oss.params_lock))
2130 			return -ERESTARTSYS;
2131 		if (trigger & PCM_ENABLE_INPUT) {
2132 			if (runtime->oss.trigger)
2133 				goto _skip2;
2134 			runtime->oss.trigger = 1;
2135 			runtime->start_threshold = 1;
2136 			cmd = SNDRV_PCM_IOCTL_START;
2137 		} else {
2138 			if (!runtime->oss.trigger)
2139 				goto _skip2;
2140 			runtime->oss.trigger = 0;
2141 			runtime->start_threshold = runtime->boundary;
2142 			cmd = SNDRV_PCM_IOCTL_DROP;
2143 			runtime->oss.prepare = 1;
2144 		}
2145  _skip2:
2146 		mutex_unlock(&runtime->oss.params_lock);
2147 		if (cmd) {
2148 			err = snd_pcm_kernel_ioctl(csubstream, cmd, NULL);
2149 			if (err < 0)
2150 				return err;
2151 		}
2152 	}
2153 	return 0;
2154 }
2155 
snd_pcm_oss_get_trigger(struct snd_pcm_oss_file * pcm_oss_file)2156 static int snd_pcm_oss_get_trigger(struct snd_pcm_oss_file *pcm_oss_file)
2157 {
2158 	struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2159 	int result = 0;
2160 
2161 	psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2162 	csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2163 	if (psubstream && psubstream->runtime && psubstream->runtime->oss.trigger)
2164 		result |= PCM_ENABLE_OUTPUT;
2165 	if (csubstream && csubstream->runtime && csubstream->runtime->oss.trigger)
2166 		result |= PCM_ENABLE_INPUT;
2167 	return result;
2168 }
2169 
snd_pcm_oss_get_odelay(struct snd_pcm_oss_file * pcm_oss_file)2170 static int snd_pcm_oss_get_odelay(struct snd_pcm_oss_file *pcm_oss_file)
2171 {
2172 	struct snd_pcm_substream *substream;
2173 	struct snd_pcm_runtime *runtime;
2174 	snd_pcm_sframes_t delay;
2175 	int err;
2176 
2177 	substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2178 	if (substream == NULL)
2179 		return -EINVAL;
2180 	err = snd_pcm_oss_make_ready(substream);
2181 	if (err < 0)
2182 		return err;
2183 	runtime = substream->runtime;
2184 	if (runtime->oss.params || runtime->oss.prepare)
2185 		return 0;
2186 	err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
2187 	if (err == -EPIPE)
2188 		delay = 0;	/* hack for broken OSS applications */
2189 	else if (err < 0)
2190 		return err;
2191 	return snd_pcm_oss_bytes(substream, delay);
2192 }
2193 
snd_pcm_oss_get_ptr(struct snd_pcm_oss_file * pcm_oss_file,int stream,struct count_info __user * _info)2194 static int snd_pcm_oss_get_ptr(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct count_info __user * _info)
2195 {
2196 	struct snd_pcm_substream *substream;
2197 	struct snd_pcm_runtime *runtime;
2198 	snd_pcm_sframes_t delay;
2199 	int fixup;
2200 	struct count_info info;
2201 	int err;
2202 
2203 	if (_info == NULL)
2204 		return -EFAULT;
2205 	substream = pcm_oss_file->streams[stream];
2206 	if (substream == NULL)
2207 		return -EINVAL;
2208 	err = snd_pcm_oss_make_ready(substream);
2209 	if (err < 0)
2210 		return err;
2211 	runtime = substream->runtime;
2212 	if (runtime->oss.params || runtime->oss.prepare) {
2213 		memset(&info, 0, sizeof(info));
2214 		if (copy_to_user(_info, &info, sizeof(info)))
2215 			return -EFAULT;
2216 		return 0;
2217 	}
2218 	if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2219 		err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
2220 		if (err == -EPIPE || err == -ESTRPIPE || (! err && delay < 0)) {
2221 			err = 0;
2222 			delay = 0;
2223 			fixup = 0;
2224 		} else {
2225 			fixup = runtime->oss.buffer_used;
2226 		}
2227 	} else {
2228 		err = snd_pcm_oss_capture_position_fixup(substream, &delay);
2229 		fixup = -runtime->oss.buffer_used;
2230 	}
2231 	if (err < 0)
2232 		return err;
2233 	info.ptr = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr % runtime->buffer_size);
2234 	if (atomic_read(&substream->mmap_count)) {
2235 		snd_pcm_sframes_t n;
2236 		delay = get_hw_ptr_period(runtime);
2237 		n = delay - runtime->oss.prev_hw_ptr_period;
2238 		if (n < 0)
2239 			n += runtime->boundary;
2240 		info.blocks = n / runtime->period_size;
2241 		runtime->oss.prev_hw_ptr_period = delay;
2242 		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2243 			snd_pcm_oss_simulate_fill(substream, delay);
2244 		info.bytes = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr) & INT_MAX;
2245 	} else {
2246 		delay = snd_pcm_oss_bytes(substream, delay);
2247 		if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2248 			if (substream->oss.setup.buggyptr)
2249 				info.blocks = (runtime->oss.buffer_bytes - delay - fixup) / runtime->oss.period_bytes;
2250 			else
2251 				info.blocks = (delay + fixup) / runtime->oss.period_bytes;
2252 			info.bytes = (runtime->oss.bytes - delay) & INT_MAX;
2253 		} else {
2254 			delay += fixup;
2255 			info.blocks = delay / runtime->oss.period_bytes;
2256 			info.bytes = (runtime->oss.bytes + delay) & INT_MAX;
2257 		}
2258 	}
2259 	if (copy_to_user(_info, &info, sizeof(info)))
2260 		return -EFAULT;
2261 	return 0;
2262 }
2263 
snd_pcm_oss_get_space(struct snd_pcm_oss_file * pcm_oss_file,int stream,struct audio_buf_info __user * _info)2264 static int snd_pcm_oss_get_space(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct audio_buf_info __user *_info)
2265 {
2266 	struct snd_pcm_substream *substream;
2267 	struct snd_pcm_runtime *runtime;
2268 	snd_pcm_sframes_t avail;
2269 	int fixup;
2270 	struct audio_buf_info info;
2271 	int err;
2272 
2273 	if (_info == NULL)
2274 		return -EFAULT;
2275 	substream = pcm_oss_file->streams[stream];
2276 	if (substream == NULL)
2277 		return -EINVAL;
2278 	runtime = substream->runtime;
2279 
2280 	if (runtime->oss.params) {
2281 		err = snd_pcm_oss_change_params(substream, false);
2282 		if (err < 0)
2283 			return err;
2284 	}
2285 
2286 	info.fragsize = runtime->oss.period_bytes;
2287 	info.fragstotal = runtime->periods;
2288 	if (runtime->oss.prepare) {
2289 		if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2290 			info.bytes = runtime->oss.period_bytes * runtime->oss.periods;
2291 			info.fragments = runtime->oss.periods;
2292 		} else {
2293 			info.bytes = 0;
2294 			info.fragments = 0;
2295 		}
2296 	} else {
2297 		if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
2298 			err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &avail);
2299 			if (err == -EPIPE || err == -ESTRPIPE || (! err && avail < 0)) {
2300 				avail = runtime->buffer_size;
2301 				err = 0;
2302 				fixup = 0;
2303 			} else {
2304 				avail = runtime->buffer_size - avail;
2305 				fixup = -runtime->oss.buffer_used;
2306 			}
2307 		} else {
2308 			err = snd_pcm_oss_capture_position_fixup(substream, &avail);
2309 			fixup = runtime->oss.buffer_used;
2310 		}
2311 		if (err < 0)
2312 			return err;
2313 		info.bytes = snd_pcm_oss_bytes(substream, avail) + fixup;
2314 		info.fragments = info.bytes / runtime->oss.period_bytes;
2315 	}
2316 
2317 #ifdef OSS_DEBUG
2318 	pcm_dbg(substream->pcm,
2319 		"pcm_oss: space: bytes = %i, fragments = %i, fragstotal = %i, fragsize = %i\n",
2320 		info.bytes, info.fragments, info.fragstotal, info.fragsize);
2321 #endif
2322 	if (copy_to_user(_info, &info, sizeof(info)))
2323 		return -EFAULT;
2324 	return 0;
2325 }
2326 
snd_pcm_oss_get_mapbuf(struct snd_pcm_oss_file * pcm_oss_file,int stream,struct buffmem_desc __user * _info)2327 static int snd_pcm_oss_get_mapbuf(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct buffmem_desc __user * _info)
2328 {
2329 	// it won't be probably implemented
2330 	// pr_debug("TODO: snd_pcm_oss_get_mapbuf\n");
2331 	return -EINVAL;
2332 }
2333 
strip_task_path(const char * path)2334 static const char *strip_task_path(const char *path)
2335 {
2336 	const char *ptr, *ptrl = NULL;
2337 	for (ptr = path; *ptr; ptr++) {
2338 		if (*ptr == '/')
2339 			ptrl = ptr + 1;
2340 	}
2341 	return ptrl;
2342 }
2343 
snd_pcm_oss_look_for_setup(struct snd_pcm * pcm,int stream,const char * task_name,struct snd_pcm_oss_setup * rsetup)2344 static void snd_pcm_oss_look_for_setup(struct snd_pcm *pcm, int stream,
2345 				      const char *task_name,
2346 				      struct snd_pcm_oss_setup *rsetup)
2347 {
2348 	struct snd_pcm_oss_setup *setup;
2349 
2350 	mutex_lock(&pcm->streams[stream].oss.setup_mutex);
2351 	do {
2352 		for (setup = pcm->streams[stream].oss.setup_list; setup;
2353 		     setup = setup->next) {
2354 			if (!strcmp(setup->task_name, task_name))
2355 				goto out;
2356 		}
2357 	} while ((task_name = strip_task_path(task_name)) != NULL);
2358  out:
2359 	if (setup)
2360 		*rsetup = *setup;
2361 	mutex_unlock(&pcm->streams[stream].oss.setup_mutex);
2362 }
2363 
snd_pcm_oss_release_substream(struct snd_pcm_substream * substream)2364 static void snd_pcm_oss_release_substream(struct snd_pcm_substream *substream)
2365 {
2366 	snd_pcm_oss_release_buffers(substream);
2367 	substream->oss.oss = 0;
2368 }
2369 
snd_pcm_oss_init_substream(struct snd_pcm_substream * substream,struct snd_pcm_oss_setup * setup,int minor)2370 static void snd_pcm_oss_init_substream(struct snd_pcm_substream *substream,
2371 				       struct snd_pcm_oss_setup *setup,
2372 				       int minor)
2373 {
2374 	struct snd_pcm_runtime *runtime;
2375 
2376 	substream->oss.oss = 1;
2377 	substream->oss.setup = *setup;
2378 	if (setup->nonblock)
2379 		substream->f_flags |= O_NONBLOCK;
2380 	else if (setup->block)
2381 		substream->f_flags &= ~O_NONBLOCK;
2382 	runtime = substream->runtime;
2383 	runtime->oss.params = 1;
2384 	runtime->oss.trigger = 1;
2385 	runtime->oss.rate = 8000;
2386 	mutex_init(&runtime->oss.params_lock);
2387 	switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
2388 	case SNDRV_MINOR_OSS_PCM_8:
2389 		runtime->oss.format = AFMT_U8;
2390 		break;
2391 	case SNDRV_MINOR_OSS_PCM_16:
2392 		runtime->oss.format = AFMT_S16_LE;
2393 		break;
2394 	default:
2395 		runtime->oss.format = AFMT_MU_LAW;
2396 	}
2397 	runtime->oss.channels = 1;
2398 	runtime->oss.fragshift = 0;
2399 	runtime->oss.maxfrags = 0;
2400 	runtime->oss.subdivision = 0;
2401 	substream->pcm_release = snd_pcm_oss_release_substream;
2402 	atomic_set(&runtime->oss.rw_ref, 0);
2403 }
2404 
snd_pcm_oss_release_file(struct snd_pcm_oss_file * pcm_oss_file)2405 static int snd_pcm_oss_release_file(struct snd_pcm_oss_file *pcm_oss_file)
2406 {
2407 	int cidx;
2408 	if (!pcm_oss_file)
2409 		return 0;
2410 	for (cidx = 0; cidx < 2; ++cidx) {
2411 		struct snd_pcm_substream *substream = pcm_oss_file->streams[cidx];
2412 		if (substream)
2413 			snd_pcm_release_substream(substream);
2414 	}
2415 	kfree(pcm_oss_file);
2416 	return 0;
2417 }
2418 
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)2419 static int snd_pcm_oss_open_file(struct file *file,
2420 				 struct snd_pcm *pcm,
2421 				 struct snd_pcm_oss_file **rpcm_oss_file,
2422 				 int minor,
2423 				 struct snd_pcm_oss_setup *setup)
2424 {
2425 	int idx, err;
2426 	struct snd_pcm_oss_file *pcm_oss_file;
2427 	struct snd_pcm_substream *substream;
2428 	fmode_t f_mode = file->f_mode;
2429 
2430 	if (rpcm_oss_file)
2431 		*rpcm_oss_file = NULL;
2432 
2433 	pcm_oss_file = kzalloc(sizeof(*pcm_oss_file), GFP_KERNEL);
2434 	if (pcm_oss_file == NULL)
2435 		return -ENOMEM;
2436 
2437 	if ((f_mode & (FMODE_WRITE|FMODE_READ)) == (FMODE_WRITE|FMODE_READ) &&
2438 	    (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX))
2439 		f_mode = FMODE_WRITE;
2440 
2441 	file->f_flags &= ~O_APPEND;
2442 	for (idx = 0; idx < 2; idx++) {
2443 		if (setup[idx].disable)
2444 			continue;
2445 		if (! pcm->streams[idx].substream_count)
2446 			continue; /* no matching substream */
2447 		if (idx == SNDRV_PCM_STREAM_PLAYBACK) {
2448 			if (! (f_mode & FMODE_WRITE))
2449 				continue;
2450 		} else {
2451 			if (! (f_mode & FMODE_READ))
2452 				continue;
2453 		}
2454 		err = snd_pcm_open_substream(pcm, idx, file, &substream);
2455 		if (err < 0) {
2456 			snd_pcm_oss_release_file(pcm_oss_file);
2457 			return err;
2458 		}
2459 
2460 		pcm_oss_file->streams[idx] = substream;
2461 		snd_pcm_oss_init_substream(substream, &setup[idx], minor);
2462 	}
2463 
2464 	if (!pcm_oss_file->streams[0] && !pcm_oss_file->streams[1]) {
2465 		snd_pcm_oss_release_file(pcm_oss_file);
2466 		return -EINVAL;
2467 	}
2468 
2469 	file->private_data = pcm_oss_file;
2470 	if (rpcm_oss_file)
2471 		*rpcm_oss_file = pcm_oss_file;
2472 	return 0;
2473 }
2474 
2475 
snd_task_name(struct task_struct * task,char * name,size_t size)2476 static int snd_task_name(struct task_struct *task, char *name, size_t size)
2477 {
2478 	unsigned int idx;
2479 
2480 	if (snd_BUG_ON(!task || !name || size < 2))
2481 		return -EINVAL;
2482 	for (idx = 0; idx < sizeof(task->comm) && idx + 1 < size; idx++)
2483 		name[idx] = task->comm[idx];
2484 	name[idx] = '\0';
2485 	return 0;
2486 }
2487 
snd_pcm_oss_open(struct inode * inode,struct file * file)2488 static int snd_pcm_oss_open(struct inode *inode, struct file *file)
2489 {
2490 	int err;
2491 	char task_name[32];
2492 	struct snd_pcm *pcm;
2493 	struct snd_pcm_oss_file *pcm_oss_file;
2494 	struct snd_pcm_oss_setup setup[2];
2495 	int nonblock;
2496 	wait_queue_entry_t wait;
2497 
2498 	err = nonseekable_open(inode, file);
2499 	if (err < 0)
2500 		return err;
2501 
2502 	pcm = snd_lookup_oss_minor_data(iminor(inode),
2503 					SNDRV_OSS_DEVICE_TYPE_PCM);
2504 	if (pcm == NULL) {
2505 		err = -ENODEV;
2506 		goto __error1;
2507 	}
2508 	err = snd_card_file_add(pcm->card, file);
2509 	if (err < 0)
2510 		goto __error1;
2511 	if (!try_module_get(pcm->card->module)) {
2512 		err = -EFAULT;
2513 		goto __error2;
2514 	}
2515 	if (snd_task_name(current, task_name, sizeof(task_name)) < 0) {
2516 		err = -EFAULT;
2517 		goto __error;
2518 	}
2519 	memset(setup, 0, sizeof(setup));
2520 	if (file->f_mode & FMODE_WRITE)
2521 		snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_PLAYBACK,
2522 					   task_name, &setup[0]);
2523 	if (file->f_mode & FMODE_READ)
2524 		snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_CAPTURE,
2525 					   task_name, &setup[1]);
2526 
2527 	nonblock = !!(file->f_flags & O_NONBLOCK);
2528 	if (!nonblock)
2529 		nonblock = nonblock_open;
2530 
2531 	init_waitqueue_entry(&wait, current);
2532 	add_wait_queue(&pcm->open_wait, &wait);
2533 	mutex_lock(&pcm->open_mutex);
2534 	while (1) {
2535 		err = snd_pcm_oss_open_file(file, pcm, &pcm_oss_file,
2536 					    iminor(inode), setup);
2537 		if (err >= 0)
2538 			break;
2539 		if (err == -EAGAIN) {
2540 			if (nonblock) {
2541 				err = -EBUSY;
2542 				break;
2543 			}
2544 		} else
2545 			break;
2546 		set_current_state(TASK_INTERRUPTIBLE);
2547 		mutex_unlock(&pcm->open_mutex);
2548 		schedule();
2549 		mutex_lock(&pcm->open_mutex);
2550 		if (pcm->card->shutdown) {
2551 			err = -ENODEV;
2552 			break;
2553 		}
2554 		if (signal_pending(current)) {
2555 			err = -ERESTARTSYS;
2556 			break;
2557 		}
2558 	}
2559 	remove_wait_queue(&pcm->open_wait, &wait);
2560 	mutex_unlock(&pcm->open_mutex);
2561 	if (err < 0)
2562 		goto __error;
2563 	snd_card_unref(pcm->card);
2564 	return err;
2565 
2566       __error:
2567      	module_put(pcm->card->module);
2568       __error2:
2569       	snd_card_file_remove(pcm->card, file);
2570       __error1:
2571 	if (pcm)
2572 		snd_card_unref(pcm->card);
2573 	return err;
2574 }
2575 
snd_pcm_oss_release(struct inode * inode,struct file * file)2576 static int snd_pcm_oss_release(struct inode *inode, struct file *file)
2577 {
2578 	struct snd_pcm *pcm;
2579 	struct snd_pcm_substream *substream;
2580 	struct snd_pcm_oss_file *pcm_oss_file;
2581 
2582 	pcm_oss_file = file->private_data;
2583 	substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2584 	if (substream == NULL)
2585 		substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2586 	if (snd_BUG_ON(!substream))
2587 		return -ENXIO;
2588 	pcm = substream->pcm;
2589 	if (!pcm->card->shutdown)
2590 		snd_pcm_oss_sync(pcm_oss_file);
2591 	mutex_lock(&pcm->open_mutex);
2592 	snd_pcm_oss_release_file(pcm_oss_file);
2593 	mutex_unlock(&pcm->open_mutex);
2594 	wake_up(&pcm->open_wait);
2595 	module_put(pcm->card->module);
2596 	snd_card_file_remove(pcm->card, file);
2597 	return 0;
2598 }
2599 
snd_pcm_oss_ioctl(struct file * file,unsigned int cmd,unsigned long arg)2600 static long snd_pcm_oss_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2601 {
2602 	struct snd_pcm_oss_file *pcm_oss_file;
2603 	int __user *p = (int __user *)arg;
2604 	int res;
2605 
2606 	pcm_oss_file = file->private_data;
2607 	if (cmd == OSS_GETVERSION)
2608 		return put_user(SNDRV_OSS_VERSION, p);
2609 	if (cmd == OSS_ALSAEMULVER)
2610 		return put_user(1, p);
2611 #if IS_REACHABLE(CONFIG_SND_MIXER_OSS)
2612 	if (((cmd >> 8) & 0xff) == 'M')	{	/* mixer ioctl - for OSS compatibility */
2613 		struct snd_pcm_substream *substream;
2614 		int idx;
2615 		for (idx = 0; idx < 2; ++idx) {
2616 			substream = pcm_oss_file->streams[idx];
2617 			if (substream != NULL)
2618 				break;
2619 		}
2620 		if (snd_BUG_ON(idx >= 2))
2621 			return -ENXIO;
2622 		return snd_mixer_oss_ioctl_card(substream->pcm->card, cmd, arg);
2623 	}
2624 #endif
2625 	if (((cmd >> 8) & 0xff) != 'P')
2626 		return -EINVAL;
2627 #ifdef OSS_DEBUG
2628 	pr_debug("pcm_oss: ioctl = 0x%x\n", cmd);
2629 #endif
2630 	switch (cmd) {
2631 	case SNDCTL_DSP_RESET:
2632 		return snd_pcm_oss_reset(pcm_oss_file);
2633 	case SNDCTL_DSP_SYNC:
2634 		return snd_pcm_oss_sync(pcm_oss_file);
2635 	case SNDCTL_DSP_SPEED:
2636 		if (get_user(res, p))
2637 			return -EFAULT;
2638 		res = snd_pcm_oss_set_rate(pcm_oss_file, res);
2639 		if (res < 0)
2640 			return res;
2641 		return put_user(res, p);
2642 	case SOUND_PCM_READ_RATE:
2643 		res = snd_pcm_oss_get_rate(pcm_oss_file);
2644 		if (res < 0)
2645 			return res;
2646 		return put_user(res, p);
2647 	case SNDCTL_DSP_STEREO:
2648 		if (get_user(res, p))
2649 			return -EFAULT;
2650 		res = res > 0 ? 2 : 1;
2651 		res = snd_pcm_oss_set_channels(pcm_oss_file, res);
2652 		if (res < 0)
2653 			return res;
2654 		return put_user(--res, p);
2655 	case SNDCTL_DSP_GETBLKSIZE:
2656 		res = snd_pcm_oss_get_block_size(pcm_oss_file);
2657 		if (res < 0)
2658 			return res;
2659 		return put_user(res, p);
2660 	case SNDCTL_DSP_SETFMT:
2661 		if (get_user(res, p))
2662 			return -EFAULT;
2663 		res = snd_pcm_oss_set_format(pcm_oss_file, res);
2664 		if (res < 0)
2665 			return res;
2666 		return put_user(res, p);
2667 	case SOUND_PCM_READ_BITS:
2668 		res = snd_pcm_oss_get_format(pcm_oss_file);
2669 		if (res < 0)
2670 			return res;
2671 		return put_user(res, p);
2672 	case SNDCTL_DSP_CHANNELS:
2673 		if (get_user(res, p))
2674 			return -EFAULT;
2675 		res = snd_pcm_oss_set_channels(pcm_oss_file, res);
2676 		if (res < 0)
2677 			return res;
2678 		return put_user(res, p);
2679 	case SOUND_PCM_READ_CHANNELS:
2680 		res = snd_pcm_oss_get_channels(pcm_oss_file);
2681 		if (res < 0)
2682 			return res;
2683 		return put_user(res, p);
2684 	case SOUND_PCM_WRITE_FILTER:
2685 	case SOUND_PCM_READ_FILTER:
2686 		return -EIO;
2687 	case SNDCTL_DSP_POST:
2688 		return snd_pcm_oss_post(pcm_oss_file);
2689 	case SNDCTL_DSP_SUBDIVIDE:
2690 		if (get_user(res, p))
2691 			return -EFAULT;
2692 		res = snd_pcm_oss_set_subdivide(pcm_oss_file, res);
2693 		if (res < 0)
2694 			return res;
2695 		return put_user(res, p);
2696 	case SNDCTL_DSP_SETFRAGMENT:
2697 		if (get_user(res, p))
2698 			return -EFAULT;
2699 		return snd_pcm_oss_set_fragment(pcm_oss_file, res);
2700 	case SNDCTL_DSP_GETFMTS:
2701 		res = snd_pcm_oss_get_formats(pcm_oss_file);
2702 		if (res < 0)
2703 			return res;
2704 		return put_user(res, p);
2705 	case SNDCTL_DSP_GETOSPACE:
2706 	case SNDCTL_DSP_GETISPACE:
2707 		return snd_pcm_oss_get_space(pcm_oss_file,
2708 			cmd == SNDCTL_DSP_GETISPACE ?
2709 				SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2710 			(struct audio_buf_info __user *) arg);
2711 	case SNDCTL_DSP_NONBLOCK:
2712 		return snd_pcm_oss_nonblock(file);
2713 	case SNDCTL_DSP_GETCAPS:
2714 		res = snd_pcm_oss_get_caps(pcm_oss_file);
2715 		if (res < 0)
2716 			return res;
2717 		return put_user(res, p);
2718 	case SNDCTL_DSP_GETTRIGGER:
2719 		res = snd_pcm_oss_get_trigger(pcm_oss_file);
2720 		if (res < 0)
2721 			return res;
2722 		return put_user(res, p);
2723 	case SNDCTL_DSP_SETTRIGGER:
2724 		if (get_user(res, p))
2725 			return -EFAULT;
2726 		return snd_pcm_oss_set_trigger(pcm_oss_file, res);
2727 	case SNDCTL_DSP_GETIPTR:
2728 	case SNDCTL_DSP_GETOPTR:
2729 		return snd_pcm_oss_get_ptr(pcm_oss_file,
2730 			cmd == SNDCTL_DSP_GETIPTR ?
2731 				SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2732 			(struct count_info __user *) arg);
2733 	case SNDCTL_DSP_MAPINBUF:
2734 	case SNDCTL_DSP_MAPOUTBUF:
2735 		return snd_pcm_oss_get_mapbuf(pcm_oss_file,
2736 			cmd == SNDCTL_DSP_MAPINBUF ?
2737 				SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
2738 			(struct buffmem_desc __user *) arg);
2739 	case SNDCTL_DSP_SETSYNCRO:
2740 		/* stop DMA now.. */
2741 		return 0;
2742 	case SNDCTL_DSP_SETDUPLEX:
2743 		if (snd_pcm_oss_get_caps(pcm_oss_file) & DSP_CAP_DUPLEX)
2744 			return 0;
2745 		return -EIO;
2746 	case SNDCTL_DSP_GETODELAY:
2747 		res = snd_pcm_oss_get_odelay(pcm_oss_file);
2748 		if (res < 0) {
2749 			/* it's for sure, some broken apps don't check for error codes */
2750 			put_user(0, p);
2751 			return res;
2752 		}
2753 		return put_user(res, p);
2754 	case SNDCTL_DSP_PROFILE:
2755 		return 0;	/* silently ignore */
2756 	default:
2757 		pr_debug("pcm_oss: unknown command = 0x%x\n", cmd);
2758 	}
2759 	return -EINVAL;
2760 }
2761 
2762 #ifdef CONFIG_COMPAT
2763 /* all compatible */
snd_pcm_oss_ioctl_compat(struct file * file,unsigned int cmd,unsigned long arg)2764 static long snd_pcm_oss_ioctl_compat(struct file *file, unsigned int cmd,
2765 				     unsigned long arg)
2766 {
2767 	/*
2768 	 * Everything is compatbile except SNDCTL_DSP_MAPINBUF/SNDCTL_DSP_MAPOUTBUF,
2769 	 * which are not implemented for the native case either
2770 	 */
2771 	return snd_pcm_oss_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
2772 }
2773 #else
2774 #define snd_pcm_oss_ioctl_compat	NULL
2775 #endif
2776 
snd_pcm_oss_read(struct file * file,char __user * buf,size_t count,loff_t * offset)2777 static ssize_t snd_pcm_oss_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
2778 {
2779 	struct snd_pcm_oss_file *pcm_oss_file;
2780 	struct snd_pcm_substream *substream;
2781 
2782 	pcm_oss_file = file->private_data;
2783 	substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2784 	if (substream == NULL)
2785 		return -ENXIO;
2786 	substream->f_flags = file->f_flags & O_NONBLOCK;
2787 #ifndef OSS_DEBUG
2788 	return snd_pcm_oss_read1(substream, buf, count);
2789 #else
2790 	{
2791 		ssize_t res = snd_pcm_oss_read1(substream, buf, count);
2792 		pcm_dbg(substream->pcm,
2793 			"pcm_oss: read %li bytes (returned %li bytes)\n",
2794 			(long)count, (long)res);
2795 		return res;
2796 	}
2797 #endif
2798 }
2799 
snd_pcm_oss_write(struct file * file,const char __user * buf,size_t count,loff_t * offset)2800 static ssize_t snd_pcm_oss_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
2801 {
2802 	struct snd_pcm_oss_file *pcm_oss_file;
2803 	struct snd_pcm_substream *substream;
2804 	long result;
2805 
2806 	pcm_oss_file = file->private_data;
2807 	substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2808 	if (substream == NULL)
2809 		return -ENXIO;
2810 	substream->f_flags = file->f_flags & O_NONBLOCK;
2811 	result = snd_pcm_oss_write1(substream, buf, count);
2812 #ifdef OSS_DEBUG
2813 	pcm_dbg(substream->pcm, "pcm_oss: write %li bytes (wrote %li bytes)\n",
2814 	       (long)count, (long)result);
2815 #endif
2816 	return result;
2817 }
2818 
snd_pcm_oss_playback_ready(struct snd_pcm_substream * substream)2819 static int snd_pcm_oss_playback_ready(struct snd_pcm_substream *substream)
2820 {
2821 	struct snd_pcm_runtime *runtime = substream->runtime;
2822 	if (atomic_read(&substream->mmap_count))
2823 		return runtime->oss.prev_hw_ptr_period !=
2824 						get_hw_ptr_period(runtime);
2825 	else
2826 		return snd_pcm_playback_avail(runtime) >=
2827 						runtime->oss.period_frames;
2828 }
2829 
snd_pcm_oss_capture_ready(struct snd_pcm_substream * substream)2830 static int snd_pcm_oss_capture_ready(struct snd_pcm_substream *substream)
2831 {
2832 	struct snd_pcm_runtime *runtime = substream->runtime;
2833 	if (atomic_read(&substream->mmap_count))
2834 		return runtime->oss.prev_hw_ptr_period !=
2835 						get_hw_ptr_period(runtime);
2836 	else
2837 		return snd_pcm_capture_avail(runtime) >=
2838 						runtime->oss.period_frames;
2839 }
2840 
snd_pcm_oss_poll(struct file * file,poll_table * wait)2841 static __poll_t snd_pcm_oss_poll(struct file *file, poll_table * wait)
2842 {
2843 	struct snd_pcm_oss_file *pcm_oss_file;
2844 	__poll_t mask;
2845 	struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;
2846 
2847 	pcm_oss_file = file->private_data;
2848 
2849 	psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2850 	csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2851 
2852 	mask = 0;
2853 	if (psubstream != NULL) {
2854 		struct snd_pcm_runtime *runtime = psubstream->runtime;
2855 		poll_wait(file, &runtime->sleep, wait);
2856 		snd_pcm_stream_lock_irq(psubstream);
2857 		if (runtime->state != SNDRV_PCM_STATE_DRAINING &&
2858 		    (runtime->state != SNDRV_PCM_STATE_RUNNING ||
2859 		     snd_pcm_oss_playback_ready(psubstream)))
2860 			mask |= EPOLLOUT | EPOLLWRNORM;
2861 		snd_pcm_stream_unlock_irq(psubstream);
2862 	}
2863 	if (csubstream != NULL) {
2864 		struct snd_pcm_runtime *runtime = csubstream->runtime;
2865 		snd_pcm_state_t ostate;
2866 		poll_wait(file, &runtime->sleep, wait);
2867 		snd_pcm_stream_lock_irq(csubstream);
2868 		ostate = runtime->state;
2869 		if (ostate != SNDRV_PCM_STATE_RUNNING ||
2870 		    snd_pcm_oss_capture_ready(csubstream))
2871 			mask |= EPOLLIN | EPOLLRDNORM;
2872 		snd_pcm_stream_unlock_irq(csubstream);
2873 		if (ostate != SNDRV_PCM_STATE_RUNNING && runtime->oss.trigger) {
2874 			struct snd_pcm_oss_file ofile;
2875 			memset(&ofile, 0, sizeof(ofile));
2876 			ofile.streams[SNDRV_PCM_STREAM_CAPTURE] = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2877 			runtime->oss.trigger = 0;
2878 			snd_pcm_oss_set_trigger(&ofile, PCM_ENABLE_INPUT);
2879 		}
2880 	}
2881 
2882 	return mask;
2883 }
2884 
snd_pcm_oss_mmap(struct file * file,struct vm_area_struct * area)2885 static int snd_pcm_oss_mmap(struct file *file, struct vm_area_struct *area)
2886 {
2887 	struct snd_pcm_oss_file *pcm_oss_file;
2888 	struct snd_pcm_substream *substream = NULL;
2889 	struct snd_pcm_runtime *runtime;
2890 	int err;
2891 
2892 #ifdef OSS_DEBUG
2893 	pr_debug("pcm_oss: mmap begin\n");
2894 #endif
2895 	pcm_oss_file = file->private_data;
2896 	switch ((area->vm_flags & (VM_READ | VM_WRITE))) {
2897 	case VM_READ | VM_WRITE:
2898 		substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2899 		if (substream)
2900 			break;
2901 		fallthrough;
2902 	case VM_READ:
2903 		substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
2904 		break;
2905 	case VM_WRITE:
2906 		substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
2907 		break;
2908 	default:
2909 		return -EINVAL;
2910 	}
2911 	/* set VM_READ access as well to fix memset() routines that do
2912 	   reads before writes (to improve performance) */
2913 	area->vm_flags |= VM_READ;
2914 	if (substream == NULL)
2915 		return -ENXIO;
2916 	runtime = substream->runtime;
2917 	if (!(runtime->info & SNDRV_PCM_INFO_MMAP_VALID))
2918 		return -EIO;
2919 	if (runtime->info & SNDRV_PCM_INFO_INTERLEAVED)
2920 		runtime->access = SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
2921 	else
2922 		return -EIO;
2923 
2924 	if (runtime->oss.params) {
2925 		/* use mutex_trylock() for params_lock for avoiding a deadlock
2926 		 * between mmap_lock and params_lock taken by
2927 		 * copy_from/to_user() in snd_pcm_oss_write/read()
2928 		 */
2929 		err = snd_pcm_oss_change_params(substream, true);
2930 		if (err < 0)
2931 			return err;
2932 	}
2933 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
2934 	if (runtime->oss.plugin_first != NULL)
2935 		return -EIO;
2936 #endif
2937 
2938 	if (area->vm_pgoff != 0)
2939 		return -EINVAL;
2940 
2941 	err = snd_pcm_mmap_data(substream, file, area);
2942 	if (err < 0)
2943 		return err;
2944 	runtime->oss.mmap_bytes = area->vm_end - area->vm_start;
2945 	runtime->silence_threshold = 0;
2946 	runtime->silence_size = 0;
2947 #ifdef OSS_DEBUG
2948 	pr_debug("pcm_oss: mmap ok, bytes = 0x%x\n",
2949 	       runtime->oss.mmap_bytes);
2950 #endif
2951 	/* In mmap mode we never stop */
2952 	runtime->stop_threshold = runtime->boundary;
2953 
2954 	return 0;
2955 }
2956 
2957 #ifdef CONFIG_SND_VERBOSE_PROCFS
2958 /*
2959  *  /proc interface
2960  */
2961 
snd_pcm_oss_proc_read(struct snd_info_entry * entry,struct snd_info_buffer * buffer)2962 static void snd_pcm_oss_proc_read(struct snd_info_entry *entry,
2963 				  struct snd_info_buffer *buffer)
2964 {
2965 	struct snd_pcm_str *pstr = entry->private_data;
2966 	struct snd_pcm_oss_setup *setup = pstr->oss.setup_list;
2967 	mutex_lock(&pstr->oss.setup_mutex);
2968 	while (setup) {
2969 		snd_iprintf(buffer, "%s %u %u%s%s%s%s%s%s\n",
2970 			    setup->task_name,
2971 			    setup->periods,
2972 			    setup->period_size,
2973 			    setup->disable ? " disable" : "",
2974 			    setup->direct ? " direct" : "",
2975 			    setup->block ? " block" : "",
2976 			    setup->nonblock ? " non-block" : "",
2977 			    setup->partialfrag ? " partial-frag" : "",
2978 			    setup->nosilence ? " no-silence" : "");
2979 		setup = setup->next;
2980 	}
2981 	mutex_unlock(&pstr->oss.setup_mutex);
2982 }
2983 
snd_pcm_oss_proc_free_setup_list(struct snd_pcm_str * pstr)2984 static void snd_pcm_oss_proc_free_setup_list(struct snd_pcm_str * pstr)
2985 {
2986 	struct snd_pcm_oss_setup *setup, *setupn;
2987 
2988 	for (setup = pstr->oss.setup_list, pstr->oss.setup_list = NULL;
2989 	     setup; setup = setupn) {
2990 		setupn = setup->next;
2991 		kfree(setup->task_name);
2992 		kfree(setup);
2993 	}
2994 	pstr->oss.setup_list = NULL;
2995 }
2996 
snd_pcm_oss_proc_write(struct snd_info_entry * entry,struct snd_info_buffer * buffer)2997 static void snd_pcm_oss_proc_write(struct snd_info_entry *entry,
2998 				   struct snd_info_buffer *buffer)
2999 {
3000 	struct snd_pcm_str *pstr = entry->private_data;
3001 	char line[128], str[32], task_name[32];
3002 	const char *ptr;
3003 	int idx1;
3004 	struct snd_pcm_oss_setup *setup, *setup1, template;
3005 
3006 	while (!snd_info_get_line(buffer, line, sizeof(line))) {
3007 		mutex_lock(&pstr->oss.setup_mutex);
3008 		memset(&template, 0, sizeof(template));
3009 		ptr = snd_info_get_str(task_name, line, sizeof(task_name));
3010 		if (!strcmp(task_name, "clear") || !strcmp(task_name, "erase")) {
3011 			snd_pcm_oss_proc_free_setup_list(pstr);
3012 			mutex_unlock(&pstr->oss.setup_mutex);
3013 			continue;
3014 		}
3015 		for (setup = pstr->oss.setup_list; setup; setup = setup->next) {
3016 			if (!strcmp(setup->task_name, task_name)) {
3017 				template = *setup;
3018 				break;
3019 			}
3020 		}
3021 		ptr = snd_info_get_str(str, ptr, sizeof(str));
3022 		template.periods = simple_strtoul(str, NULL, 10);
3023 		ptr = snd_info_get_str(str, ptr, sizeof(str));
3024 		template.period_size = simple_strtoul(str, NULL, 10);
3025 		for (idx1 = 31; idx1 >= 0; idx1--)
3026 			if (template.period_size & (1 << idx1))
3027 				break;
3028 		for (idx1--; idx1 >= 0; idx1--)
3029 			template.period_size &= ~(1 << idx1);
3030 		do {
3031 			ptr = snd_info_get_str(str, ptr, sizeof(str));
3032 			if (!strcmp(str, "disable")) {
3033 				template.disable = 1;
3034 			} else if (!strcmp(str, "direct")) {
3035 				template.direct = 1;
3036 			} else if (!strcmp(str, "block")) {
3037 				template.block = 1;
3038 			} else if (!strcmp(str, "non-block")) {
3039 				template.nonblock = 1;
3040 			} else if (!strcmp(str, "partial-frag")) {
3041 				template.partialfrag = 1;
3042 			} else if (!strcmp(str, "no-silence")) {
3043 				template.nosilence = 1;
3044 			} else if (!strcmp(str, "buggy-ptr")) {
3045 				template.buggyptr = 1;
3046 			}
3047 		} while (*str);
3048 		if (setup == NULL) {
3049 			setup = kmalloc(sizeof(*setup), GFP_KERNEL);
3050 			if (! setup) {
3051 				buffer->error = -ENOMEM;
3052 				mutex_unlock(&pstr->oss.setup_mutex);
3053 				return;
3054 			}
3055 			if (pstr->oss.setup_list == NULL)
3056 				pstr->oss.setup_list = setup;
3057 			else {
3058 				for (setup1 = pstr->oss.setup_list;
3059 				     setup1->next; setup1 = setup1->next);
3060 				setup1->next = setup;
3061 			}
3062 			template.task_name = kstrdup(task_name, GFP_KERNEL);
3063 			if (! template.task_name) {
3064 				kfree(setup);
3065 				buffer->error = -ENOMEM;
3066 				mutex_unlock(&pstr->oss.setup_mutex);
3067 				return;
3068 			}
3069 		}
3070 		*setup = template;
3071 		mutex_unlock(&pstr->oss.setup_mutex);
3072 	}
3073 }
3074 
snd_pcm_oss_proc_init(struct snd_pcm * pcm)3075 static void snd_pcm_oss_proc_init(struct snd_pcm *pcm)
3076 {
3077 	int stream;
3078 	for (stream = 0; stream < 2; ++stream) {
3079 		struct snd_info_entry *entry;
3080 		struct snd_pcm_str *pstr = &pcm->streams[stream];
3081 		if (pstr->substream_count == 0)
3082 			continue;
3083 		entry = snd_info_create_card_entry(pcm->card, "oss", pstr->proc_root);
3084 		if (entry) {
3085 			entry->content = SNDRV_INFO_CONTENT_TEXT;
3086 			entry->mode = S_IFREG | 0644;
3087 			entry->c.text.read = snd_pcm_oss_proc_read;
3088 			entry->c.text.write = snd_pcm_oss_proc_write;
3089 			entry->private_data = pstr;
3090 			if (snd_info_register(entry) < 0) {
3091 				snd_info_free_entry(entry);
3092 				entry = NULL;
3093 			}
3094 		}
3095 		pstr->oss.proc_entry = entry;
3096 	}
3097 }
3098 
snd_pcm_oss_proc_done(struct snd_pcm * pcm)3099 static void snd_pcm_oss_proc_done(struct snd_pcm *pcm)
3100 {
3101 	int stream;
3102 	for (stream = 0; stream < 2; ++stream) {
3103 		struct snd_pcm_str *pstr = &pcm->streams[stream];
3104 		snd_info_free_entry(pstr->oss.proc_entry);
3105 		pstr->oss.proc_entry = NULL;
3106 		snd_pcm_oss_proc_free_setup_list(pstr);
3107 	}
3108 }
3109 #else /* !CONFIG_SND_VERBOSE_PROCFS */
snd_pcm_oss_proc_init(struct snd_pcm * pcm)3110 static inline void snd_pcm_oss_proc_init(struct snd_pcm *pcm)
3111 {
3112 }
snd_pcm_oss_proc_done(struct snd_pcm * pcm)3113 static inline void snd_pcm_oss_proc_done(struct snd_pcm *pcm)
3114 {
3115 }
3116 #endif /* CONFIG_SND_VERBOSE_PROCFS */
3117 
3118 /*
3119  *  ENTRY functions
3120  */
3121 
3122 static const struct file_operations snd_pcm_oss_f_reg =
3123 {
3124 	.owner =	THIS_MODULE,
3125 	.read =		snd_pcm_oss_read,
3126 	.write =	snd_pcm_oss_write,
3127 	.open =		snd_pcm_oss_open,
3128 	.release =	snd_pcm_oss_release,
3129 	.llseek =	no_llseek,
3130 	.poll =		snd_pcm_oss_poll,
3131 	.unlocked_ioctl =	snd_pcm_oss_ioctl,
3132 	.compat_ioctl =	snd_pcm_oss_ioctl_compat,
3133 	.mmap =		snd_pcm_oss_mmap,
3134 };
3135 
register_oss_dsp(struct snd_pcm * pcm,int index)3136 static void register_oss_dsp(struct snd_pcm *pcm, int index)
3137 {
3138 	if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3139 				    pcm->card, index, &snd_pcm_oss_f_reg,
3140 				    pcm) < 0) {
3141 		pcm_err(pcm, "unable to register OSS PCM device %i:%i\n",
3142 			   pcm->card->number, pcm->device);
3143 	}
3144 }
3145 
snd_pcm_oss_register_minor(struct snd_pcm * pcm)3146 static int snd_pcm_oss_register_minor(struct snd_pcm *pcm)
3147 {
3148 	pcm->oss.reg = 0;
3149 	if (dsp_map[pcm->card->number] == (int)pcm->device) {
3150 		char name[128];
3151 		int duplex;
3152 		register_oss_dsp(pcm, 0);
3153 		duplex = (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count > 0 &&
3154 			      pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count &&
3155 			      !(pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX));
3156 		sprintf(name, "%s%s", pcm->name, duplex ? " (DUPLEX)" : "");
3157 #ifdef SNDRV_OSS_INFO_DEV_AUDIO
3158 		snd_oss_info_register(SNDRV_OSS_INFO_DEV_AUDIO,
3159 				      pcm->card->number,
3160 				      name);
3161 #endif
3162 		pcm->oss.reg++;
3163 		pcm->oss.reg_mask |= 1;
3164 	}
3165 	if (adsp_map[pcm->card->number] == (int)pcm->device) {
3166 		register_oss_dsp(pcm, 1);
3167 		pcm->oss.reg++;
3168 		pcm->oss.reg_mask |= 2;
3169 	}
3170 
3171 	if (pcm->oss.reg)
3172 		snd_pcm_oss_proc_init(pcm);
3173 
3174 	return 0;
3175 }
3176 
snd_pcm_oss_disconnect_minor(struct snd_pcm * pcm)3177 static int snd_pcm_oss_disconnect_minor(struct snd_pcm *pcm)
3178 {
3179 	if (pcm->oss.reg) {
3180 		if (pcm->oss.reg_mask & 1) {
3181 			pcm->oss.reg_mask &= ~1;
3182 			snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3183 						  pcm->card, 0);
3184 		}
3185 		if (pcm->oss.reg_mask & 2) {
3186 			pcm->oss.reg_mask &= ~2;
3187 			snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
3188 						  pcm->card, 1);
3189 		}
3190 		if (dsp_map[pcm->card->number] == (int)pcm->device) {
3191 #ifdef SNDRV_OSS_INFO_DEV_AUDIO
3192 			snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_AUDIO, pcm->card->number);
3193 #endif
3194 		}
3195 		pcm->oss.reg = 0;
3196 	}
3197 	return 0;
3198 }
3199 
snd_pcm_oss_unregister_minor(struct snd_pcm * pcm)3200 static int snd_pcm_oss_unregister_minor(struct snd_pcm *pcm)
3201 {
3202 	snd_pcm_oss_disconnect_minor(pcm);
3203 	snd_pcm_oss_proc_done(pcm);
3204 	return 0;
3205 }
3206 
3207 static struct snd_pcm_notify snd_pcm_oss_notify =
3208 {
3209 	.n_register =	snd_pcm_oss_register_minor,
3210 	.n_disconnect = snd_pcm_oss_disconnect_minor,
3211 	.n_unregister =	snd_pcm_oss_unregister_minor,
3212 };
3213 
alsa_pcm_oss_init(void)3214 static int __init alsa_pcm_oss_init(void)
3215 {
3216 	int i;
3217 	int err;
3218 
3219 	/* check device map table */
3220 	for (i = 0; i < SNDRV_CARDS; i++) {
3221 		if (dsp_map[i] < 0 || dsp_map[i] >= SNDRV_PCM_DEVICES) {
3222 			pr_err("ALSA: pcm_oss: invalid dsp_map[%d] = %d\n",
3223 				   i, dsp_map[i]);
3224 			dsp_map[i] = 0;
3225 		}
3226 		if (adsp_map[i] < 0 || adsp_map[i] >= SNDRV_PCM_DEVICES) {
3227 			pr_err("ALSA: pcm_oss: invalid adsp_map[%d] = %d\n",
3228 				   i, adsp_map[i]);
3229 			adsp_map[i] = 1;
3230 		}
3231 	}
3232 	err = snd_pcm_notify(&snd_pcm_oss_notify, 0);
3233 	if (err < 0)
3234 		return err;
3235 	return 0;
3236 }
3237 
alsa_pcm_oss_exit(void)3238 static void __exit alsa_pcm_oss_exit(void)
3239 {
3240 	snd_pcm_notify(&snd_pcm_oss_notify, 1);
3241 }
3242 
3243 module_init(alsa_pcm_oss_init)
3244 module_exit(alsa_pcm_oss_exit)
3245