xref: /linux/sound/core/oss/mixer_oss.c (revision 3fd6c59042dbba50391e30862beac979491145fe)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  OSS emulation layer for the mixer interface
4  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
5  */
6 
7 #include <linux/init.h>
8 #include <linux/slab.h>
9 #include <linux/time.h>
10 #include <linux/string.h>
11 #include <linux/module.h>
12 #include <linux/compat.h>
13 #include <sound/core.h>
14 #include <sound/minors.h>
15 #include <sound/control.h>
16 #include <sound/info.h>
17 #include <sound/mixer_oss.h>
18 #include <linux/soundcard.h>
19 
20 #define OSS_ALSAEMULVER         _SIOR ('M', 249, int)
21 
22 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
23 MODULE_DESCRIPTION("Mixer OSS emulation for ALSA.");
24 MODULE_LICENSE("GPL");
25 MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_MIXER);
26 
snd_mixer_oss_open(struct inode * inode,struct file * file)27 static int snd_mixer_oss_open(struct inode *inode, struct file *file)
28 {
29 	struct snd_card *card;
30 	struct snd_mixer_oss_file *fmixer;
31 	int err;
32 
33 	err = nonseekable_open(inode, file);
34 	if (err < 0)
35 		return err;
36 
37 	card = snd_lookup_oss_minor_data(iminor(inode),
38 					 SNDRV_OSS_DEVICE_TYPE_MIXER);
39 	if (card == NULL)
40 		return -ENODEV;
41 	if (card->mixer_oss == NULL) {
42 		snd_card_unref(card);
43 		return -ENODEV;
44 	}
45 	err = snd_card_file_add(card, file);
46 	if (err < 0) {
47 		snd_card_unref(card);
48 		return err;
49 	}
50 	fmixer = kzalloc(sizeof(*fmixer), GFP_KERNEL);
51 	if (fmixer == NULL) {
52 		snd_card_file_remove(card, file);
53 		snd_card_unref(card);
54 		return -ENOMEM;
55 	}
56 	fmixer->card = card;
57 	fmixer->mixer = card->mixer_oss;
58 	file->private_data = fmixer;
59 	if (!try_module_get(card->module)) {
60 		kfree(fmixer);
61 		snd_card_file_remove(card, file);
62 		snd_card_unref(card);
63 		return -EFAULT;
64 	}
65 	snd_card_unref(card);
66 	return 0;
67 }
68 
snd_mixer_oss_release(struct inode * inode,struct file * file)69 static int snd_mixer_oss_release(struct inode *inode, struct file *file)
70 {
71 	struct snd_mixer_oss_file *fmixer;
72 
73 	if (file->private_data) {
74 		fmixer = file->private_data;
75 		module_put(fmixer->card->module);
76 		snd_card_file_remove(fmixer->card, file);
77 		kfree(fmixer);
78 	}
79 	return 0;
80 }
81 
snd_mixer_oss_info(struct snd_mixer_oss_file * fmixer,mixer_info __user * _info)82 static int snd_mixer_oss_info(struct snd_mixer_oss_file *fmixer,
83 			      mixer_info __user *_info)
84 {
85 	struct snd_card *card = fmixer->card;
86 	struct snd_mixer_oss *mixer = fmixer->mixer;
87 	struct mixer_info info;
88 
89 	memset(&info, 0, sizeof(info));
90 	strscpy(info.id, mixer && mixer->id[0] ? mixer->id : card->driver, sizeof(info.id));
91 	strscpy(info.name, mixer && mixer->name[0] ? mixer->name : card->mixername, sizeof(info.name));
92 	info.modify_counter = card->mixer_oss_change_count;
93 	if (copy_to_user(_info, &info, sizeof(info)))
94 		return -EFAULT;
95 	return 0;
96 }
97 
snd_mixer_oss_info_obsolete(struct snd_mixer_oss_file * fmixer,_old_mixer_info __user * _info)98 static int snd_mixer_oss_info_obsolete(struct snd_mixer_oss_file *fmixer,
99 				       _old_mixer_info __user *_info)
100 {
101 	struct snd_card *card = fmixer->card;
102 	struct snd_mixer_oss *mixer = fmixer->mixer;
103 	_old_mixer_info info;
104 
105 	memset(&info, 0, sizeof(info));
106 	strscpy(info.id, mixer && mixer->id[0] ? mixer->id : card->driver, sizeof(info.id));
107 	strscpy(info.name, mixer && mixer->name[0] ? mixer->name : card->mixername, sizeof(info.name));
108 	if (copy_to_user(_info, &info, sizeof(info)))
109 		return -EFAULT;
110 	return 0;
111 }
112 
snd_mixer_oss_caps(struct snd_mixer_oss_file * fmixer)113 static int snd_mixer_oss_caps(struct snd_mixer_oss_file *fmixer)
114 {
115 	struct snd_mixer_oss *mixer = fmixer->mixer;
116 	int result = 0;
117 
118 	if (mixer == NULL)
119 		return -EIO;
120 	if (mixer->get_recsrc && mixer->put_recsrc)
121 		result |= SOUND_CAP_EXCL_INPUT;
122 	return result;
123 }
124 
snd_mixer_oss_devmask(struct snd_mixer_oss_file * fmixer)125 static int snd_mixer_oss_devmask(struct snd_mixer_oss_file *fmixer)
126 {
127 	struct snd_mixer_oss *mixer = fmixer->mixer;
128 	struct snd_mixer_oss_slot *pslot;
129 	int result = 0, chn;
130 
131 	if (mixer == NULL)
132 		return -EIO;
133 	guard(mutex)(&mixer->reg_mutex);
134 	for (chn = 0; chn < 31; chn++) {
135 		pslot = &mixer->slots[chn];
136 		if (pslot->put_volume || pslot->put_recsrc)
137 			result |= 1 << chn;
138 	}
139 	return result;
140 }
141 
snd_mixer_oss_stereodevs(struct snd_mixer_oss_file * fmixer)142 static int snd_mixer_oss_stereodevs(struct snd_mixer_oss_file *fmixer)
143 {
144 	struct snd_mixer_oss *mixer = fmixer->mixer;
145 	struct snd_mixer_oss_slot *pslot;
146 	int result = 0, chn;
147 
148 	if (mixer == NULL)
149 		return -EIO;
150 	guard(mutex)(&mixer->reg_mutex);
151 	for (chn = 0; chn < 31; chn++) {
152 		pslot = &mixer->slots[chn];
153 		if (pslot->put_volume && pslot->stereo)
154 			result |= 1 << chn;
155 	}
156 	return result;
157 }
158 
snd_mixer_oss_recmask(struct snd_mixer_oss_file * fmixer)159 static int snd_mixer_oss_recmask(struct snd_mixer_oss_file *fmixer)
160 {
161 	struct snd_mixer_oss *mixer = fmixer->mixer;
162 	int result = 0;
163 
164 	if (mixer == NULL)
165 		return -EIO;
166 	guard(mutex)(&mixer->reg_mutex);
167 	if (mixer->put_recsrc && mixer->get_recsrc) {	/* exclusive */
168 		result = mixer->mask_recsrc;
169 	} else {
170 		struct snd_mixer_oss_slot *pslot;
171 		int chn;
172 		for (chn = 0; chn < 31; chn++) {
173 			pslot = &mixer->slots[chn];
174 			if (pslot->put_recsrc)
175 				result |= 1 << chn;
176 		}
177 	}
178 	return result;
179 }
180 
snd_mixer_oss_get_recsrc(struct snd_mixer_oss_file * fmixer)181 static int snd_mixer_oss_get_recsrc(struct snd_mixer_oss_file *fmixer)
182 {
183 	struct snd_mixer_oss *mixer = fmixer->mixer;
184 	int result = 0;
185 
186 	if (mixer == NULL)
187 		return -EIO;
188 	guard(mutex)(&mixer->reg_mutex);
189 	if (mixer->put_recsrc && mixer->get_recsrc) {	/* exclusive */
190 		unsigned int index;
191 		result = mixer->get_recsrc(fmixer, &index);
192 		if (result < 0)
193 			return result;
194 		result = 1 << index;
195 	} else {
196 		struct snd_mixer_oss_slot *pslot;
197 		int chn;
198 		for (chn = 0; chn < 31; chn++) {
199 			pslot = &mixer->slots[chn];
200 			if (pslot->get_recsrc) {
201 				int active = 0;
202 				pslot->get_recsrc(fmixer, pslot, &active);
203 				if (active)
204 					result |= 1 << chn;
205 			}
206 		}
207 	}
208 	mixer->oss_recsrc = result;
209 	return result;
210 }
211 
snd_mixer_oss_set_recsrc(struct snd_mixer_oss_file * fmixer,int recsrc)212 static int snd_mixer_oss_set_recsrc(struct snd_mixer_oss_file *fmixer, int recsrc)
213 {
214 	struct snd_mixer_oss *mixer = fmixer->mixer;
215 	struct snd_mixer_oss_slot *pslot;
216 	int chn, active;
217 	unsigned int index;
218 	int result = 0;
219 
220 	if (mixer == NULL)
221 		return -EIO;
222 	guard(mutex)(&mixer->reg_mutex);
223 	if (mixer->get_recsrc && mixer->put_recsrc) {	/* exclusive input */
224 		if (recsrc & ~mixer->oss_recsrc)
225 			recsrc &= ~mixer->oss_recsrc;
226 		mixer->put_recsrc(fmixer, ffz(~recsrc));
227 		mixer->get_recsrc(fmixer, &index);
228 		result = 1 << index;
229 	}
230 	for (chn = 0; chn < 31; chn++) {
231 		pslot = &mixer->slots[chn];
232 		if (pslot->put_recsrc) {
233 			active = (recsrc & (1 << chn)) ? 1 : 0;
234 			pslot->put_recsrc(fmixer, pslot, active);
235 		}
236 	}
237 	if (! result) {
238 		for (chn = 0; chn < 31; chn++) {
239 			pslot = &mixer->slots[chn];
240 			if (pslot->get_recsrc) {
241 				active = 0;
242 				pslot->get_recsrc(fmixer, pslot, &active);
243 				if (active)
244 					result |= 1 << chn;
245 			}
246 		}
247 	}
248 	return result;
249 }
250 
snd_mixer_oss_get_volume(struct snd_mixer_oss_file * fmixer,int slot)251 static int snd_mixer_oss_get_volume(struct snd_mixer_oss_file *fmixer, int slot)
252 {
253 	struct snd_mixer_oss *mixer = fmixer->mixer;
254 	struct snd_mixer_oss_slot *pslot;
255 	int result = 0, left, right;
256 
257 	if (mixer == NULL || slot > 30)
258 		return -EIO;
259 	guard(mutex)(&mixer->reg_mutex);
260 	pslot = &mixer->slots[slot];
261 	left = pslot->volume[0];
262 	right = pslot->volume[1];
263 	if (pslot->get_volume)
264 		result = pslot->get_volume(fmixer, pslot, &left, &right);
265 	if (!pslot->stereo)
266 		right = left;
267 	if (snd_BUG_ON(left < 0 || left > 100))
268 		return -EIO;
269 	if (snd_BUG_ON(right < 0 || right > 100))
270 		return -EIO;
271 	if (result >= 0) {
272 		pslot->volume[0] = left;
273 		pslot->volume[1] = right;
274 	 	result = (left & 0xff) | ((right & 0xff) << 8);
275 	}
276 	return result;
277 }
278 
snd_mixer_oss_set_volume(struct snd_mixer_oss_file * fmixer,int slot,int volume)279 static int snd_mixer_oss_set_volume(struct snd_mixer_oss_file *fmixer,
280 				    int slot, int volume)
281 {
282 	struct snd_mixer_oss *mixer = fmixer->mixer;
283 	struct snd_mixer_oss_slot *pslot;
284 	int result = 0, left = volume & 0xff, right = (volume >> 8) & 0xff;
285 
286 	if (mixer == NULL || slot > 30)
287 		return -EIO;
288 	guard(mutex)(&mixer->reg_mutex);
289 	pslot = &mixer->slots[slot];
290 	if (left > 100)
291 		left = 100;
292 	if (right > 100)
293 		right = 100;
294 	if (!pslot->stereo)
295 		right = left;
296 	if (pslot->put_volume)
297 		result = pslot->put_volume(fmixer, pslot, left, right);
298 	if (result < 0)
299 		return result;
300 	pslot->volume[0] = left;
301 	pslot->volume[1] = right;
302 	result = (left & 0xff) | ((right & 0xff) << 8);
303 	return result;
304 }
305 
snd_mixer_oss_ioctl1(struct snd_mixer_oss_file * fmixer,unsigned int cmd,unsigned long arg)306 static int snd_mixer_oss_ioctl1(struct snd_mixer_oss_file *fmixer, unsigned int cmd, unsigned long arg)
307 {
308 	void __user *argp = (void __user *)arg;
309 	int __user *p = argp;
310 	int tmp;
311 
312 	if (snd_BUG_ON(!fmixer))
313 		return -ENXIO;
314 	if (((cmd >> 8) & 0xff) == 'M') {
315 		switch (cmd) {
316 		case SOUND_MIXER_INFO:
317 			return snd_mixer_oss_info(fmixer, argp);
318 		case SOUND_OLD_MIXER_INFO:
319  			return snd_mixer_oss_info_obsolete(fmixer, argp);
320 		case SOUND_MIXER_WRITE_RECSRC:
321 			if (get_user(tmp, p))
322 				return -EFAULT;
323 			tmp = snd_mixer_oss_set_recsrc(fmixer, tmp);
324 			if (tmp < 0)
325 				return tmp;
326 			return put_user(tmp, p);
327 		case OSS_GETVERSION:
328 			return put_user(SNDRV_OSS_VERSION, p);
329 		case OSS_ALSAEMULVER:
330 			return put_user(1, p);
331 		case SOUND_MIXER_READ_DEVMASK:
332 			tmp = snd_mixer_oss_devmask(fmixer);
333 			if (tmp < 0)
334 				return tmp;
335 			return put_user(tmp, p);
336 		case SOUND_MIXER_READ_STEREODEVS:
337 			tmp = snd_mixer_oss_stereodevs(fmixer);
338 			if (tmp < 0)
339 				return tmp;
340 			return put_user(tmp, p);
341 		case SOUND_MIXER_READ_RECMASK:
342 			tmp = snd_mixer_oss_recmask(fmixer);
343 			if (tmp < 0)
344 				return tmp;
345 			return put_user(tmp, p);
346 		case SOUND_MIXER_READ_CAPS:
347 			tmp = snd_mixer_oss_caps(fmixer);
348 			if (tmp < 0)
349 				return tmp;
350 			return put_user(tmp, p);
351 		case SOUND_MIXER_READ_RECSRC:
352 			tmp = snd_mixer_oss_get_recsrc(fmixer);
353 			if (tmp < 0)
354 				return tmp;
355 			return put_user(tmp, p);
356 		}
357 	}
358 	if (cmd & SIOC_IN) {
359 		if (get_user(tmp, p))
360 			return -EFAULT;
361 		tmp = snd_mixer_oss_set_volume(fmixer, cmd & 0xff, tmp);
362 		if (tmp < 0)
363 			return tmp;
364 		return put_user(tmp, p);
365 	} else if (cmd & SIOC_OUT) {
366 		tmp = snd_mixer_oss_get_volume(fmixer, cmd & 0xff);
367 		if (tmp < 0)
368 			return tmp;
369 		return put_user(tmp, p);
370 	}
371 	return -ENXIO;
372 }
373 
snd_mixer_oss_ioctl(struct file * file,unsigned int cmd,unsigned long arg)374 static long snd_mixer_oss_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
375 {
376 	return snd_mixer_oss_ioctl1(file->private_data, cmd, arg);
377 }
378 
snd_mixer_oss_ioctl_card(struct snd_card * card,unsigned int cmd,unsigned long arg)379 int snd_mixer_oss_ioctl_card(struct snd_card *card, unsigned int cmd, unsigned long arg)
380 {
381 	struct snd_mixer_oss_file fmixer;
382 
383 	if (snd_BUG_ON(!card))
384 		return -ENXIO;
385 	if (card->mixer_oss == NULL)
386 		return -ENXIO;
387 	memset(&fmixer, 0, sizeof(fmixer));
388 	fmixer.card = card;
389 	fmixer.mixer = card->mixer_oss;
390 	return snd_mixer_oss_ioctl1(&fmixer, cmd, arg);
391 }
392 EXPORT_SYMBOL(snd_mixer_oss_ioctl_card);
393 
394 #ifdef CONFIG_COMPAT
395 /* all compatible */
snd_mixer_oss_ioctl_compat(struct file * file,unsigned int cmd,unsigned long arg)396 static long snd_mixer_oss_ioctl_compat(struct file *file, unsigned int cmd,
397 				       unsigned long arg)
398 {
399 	return snd_mixer_oss_ioctl1(file->private_data, cmd,
400 				    (unsigned long)compat_ptr(arg));
401 }
402 #else
403 #define snd_mixer_oss_ioctl_compat	NULL
404 #endif
405 
406 /*
407  *  REGISTRATION PART
408  */
409 
410 static const struct file_operations snd_mixer_oss_f_ops =
411 {
412 	.owner =	THIS_MODULE,
413 	.open =		snd_mixer_oss_open,
414 	.release =	snd_mixer_oss_release,
415 	.unlocked_ioctl =	snd_mixer_oss_ioctl,
416 	.compat_ioctl =	snd_mixer_oss_ioctl_compat,
417 };
418 
419 /*
420  *  utilities
421  */
422 
snd_mixer_oss_conv(long val,long omin,long omax,long nmin,long nmax)423 static long snd_mixer_oss_conv(long val, long omin, long omax, long nmin, long nmax)
424 {
425 	long orange = omax - omin, nrange = nmax - nmin;
426 
427 	if (orange == 0)
428 		return 0;
429 	return DIV_ROUND_CLOSEST(nrange * (val - omin), orange) + nmin;
430 }
431 
432 /* convert from alsa native to oss values (0-100) */
snd_mixer_oss_conv1(long val,long min,long max,int * old)433 static long snd_mixer_oss_conv1(long val, long min, long max, int *old)
434 {
435 	if (val == snd_mixer_oss_conv(*old, 0, 100, min, max))
436 		return *old;
437 	return snd_mixer_oss_conv(val, min, max, 0, 100);
438 }
439 
440 /* convert from oss to alsa native values */
snd_mixer_oss_conv2(long val,long min,long max)441 static long snd_mixer_oss_conv2(long val, long min, long max)
442 {
443 	return snd_mixer_oss_conv(val, 0, 100, min, max);
444 }
445 
446 #if 0
447 static void snd_mixer_oss_recsrce_set(struct snd_card *card, int slot)
448 {
449 	struct snd_mixer_oss *mixer = card->mixer_oss;
450 	if (mixer)
451 		mixer->mask_recsrc |= 1 << slot;
452 }
453 
454 static int snd_mixer_oss_recsrce_get(struct snd_card *card, int slot)
455 {
456 	struct snd_mixer_oss *mixer = card->mixer_oss;
457 	if (mixer && (mixer->mask_recsrc & (1 << slot)))
458 		return 1;
459 	return 0;
460 }
461 #endif
462 
463 #define SNDRV_MIXER_OSS_SIGNATURE		0x65999250
464 
465 #define SNDRV_MIXER_OSS_ITEM_GLOBAL	0
466 #define SNDRV_MIXER_OSS_ITEM_GSWITCH	1
467 #define SNDRV_MIXER_OSS_ITEM_GROUTE	2
468 #define SNDRV_MIXER_OSS_ITEM_GVOLUME	3
469 #define SNDRV_MIXER_OSS_ITEM_PSWITCH	4
470 #define SNDRV_MIXER_OSS_ITEM_PROUTE	5
471 #define SNDRV_MIXER_OSS_ITEM_PVOLUME	6
472 #define SNDRV_MIXER_OSS_ITEM_CSWITCH	7
473 #define SNDRV_MIXER_OSS_ITEM_CROUTE	8
474 #define SNDRV_MIXER_OSS_ITEM_CVOLUME	9
475 #define SNDRV_MIXER_OSS_ITEM_CAPTURE	10
476 
477 #define SNDRV_MIXER_OSS_ITEM_COUNT	11
478 
479 #define SNDRV_MIXER_OSS_PRESENT_GLOBAL	(1<<0)
480 #define SNDRV_MIXER_OSS_PRESENT_GSWITCH	(1<<1)
481 #define SNDRV_MIXER_OSS_PRESENT_GROUTE	(1<<2)
482 #define SNDRV_MIXER_OSS_PRESENT_GVOLUME	(1<<3)
483 #define SNDRV_MIXER_OSS_PRESENT_PSWITCH	(1<<4)
484 #define SNDRV_MIXER_OSS_PRESENT_PROUTE	(1<<5)
485 #define SNDRV_MIXER_OSS_PRESENT_PVOLUME	(1<<6)
486 #define SNDRV_MIXER_OSS_PRESENT_CSWITCH	(1<<7)
487 #define SNDRV_MIXER_OSS_PRESENT_CROUTE	(1<<8)
488 #define SNDRV_MIXER_OSS_PRESENT_CVOLUME	(1<<9)
489 #define SNDRV_MIXER_OSS_PRESENT_CAPTURE	(1<<10)
490 
491 struct slot {
492 	unsigned int signature;
493 	unsigned int present;
494 	unsigned int channels;
495 	unsigned int numid[SNDRV_MIXER_OSS_ITEM_COUNT];
496 	unsigned int capture_item;
497 	const struct snd_mixer_oss_assign_table *assigned;
498 	unsigned int allocated: 1;
499 };
500 
501 #define ID_UNKNOWN	((unsigned int)-1)
502 
snd_mixer_oss_test_id(struct snd_mixer_oss * mixer,const char * name,int index)503 static struct snd_kcontrol *snd_mixer_oss_test_id(struct snd_mixer_oss *mixer, const char *name, int index)
504 {
505 	struct snd_card *card = mixer->card;
506 	struct snd_ctl_elem_id id;
507 
508 	memset(&id, 0, sizeof(id));
509 	id.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
510 	strscpy(id.name, name, sizeof(id.name));
511 	id.index = index;
512 	return snd_ctl_find_id(card, &id);
513 }
514 
snd_mixer_oss_get_volume1_vol(struct snd_mixer_oss_file * fmixer,struct snd_mixer_oss_slot * pslot,unsigned int numid,int * left,int * right)515 static void snd_mixer_oss_get_volume1_vol(struct snd_mixer_oss_file *fmixer,
516 					  struct snd_mixer_oss_slot *pslot,
517 					  unsigned int numid,
518 					  int *left, int *right)
519 {
520 	struct snd_ctl_elem_info *uinfo __free(kfree) = NULL;
521 	struct snd_ctl_elem_value *uctl __free(kfree) = NULL;
522 	struct snd_kcontrol *kctl;
523 	struct snd_card *card = fmixer->card;
524 
525 	if (numid == ID_UNKNOWN)
526 		return;
527 	guard(rwsem_read)(&card->controls_rwsem);
528 	kctl = snd_ctl_find_numid(card, numid);
529 	if (!kctl)
530 		return;
531 	uinfo = kzalloc(sizeof(*uinfo), GFP_KERNEL);
532 	uctl = kzalloc(sizeof(*uctl), GFP_KERNEL);
533 	if (uinfo == NULL || uctl == NULL)
534 		return;
535 	if (kctl->info(kctl, uinfo))
536 		return;
537 	if (kctl->get(kctl, uctl))
538 		return;
539 	if (uinfo->type == SNDRV_CTL_ELEM_TYPE_BOOLEAN &&
540 	    uinfo->value.integer.min == 0 && uinfo->value.integer.max == 1)
541 		return;
542 	*left = snd_mixer_oss_conv1(uctl->value.integer.value[0], uinfo->value.integer.min, uinfo->value.integer.max, &pslot->volume[0]);
543 	if (uinfo->count > 1)
544 		*right = snd_mixer_oss_conv1(uctl->value.integer.value[1], uinfo->value.integer.min, uinfo->value.integer.max, &pslot->volume[1]);
545 }
546 
snd_mixer_oss_get_volume1_sw(struct snd_mixer_oss_file * fmixer,struct snd_mixer_oss_slot * pslot,unsigned int numid,int * left,int * right,int route)547 static void snd_mixer_oss_get_volume1_sw(struct snd_mixer_oss_file *fmixer,
548 					 struct snd_mixer_oss_slot *pslot,
549 					 unsigned int numid,
550 					 int *left, int *right,
551 					 int route)
552 {
553 	struct snd_ctl_elem_info *uinfo __free(kfree) = NULL;
554 	struct snd_ctl_elem_value *uctl __free(kfree) = NULL;
555 	struct snd_kcontrol *kctl;
556 	struct snd_card *card = fmixer->card;
557 
558 	if (numid == ID_UNKNOWN)
559 		return;
560 	guard(rwsem_read)(&card->controls_rwsem);
561 	kctl = snd_ctl_find_numid(card, numid);
562 	if (!kctl)
563 		return;
564 	uinfo = kzalloc(sizeof(*uinfo), GFP_KERNEL);
565 	uctl = kzalloc(sizeof(*uctl), GFP_KERNEL);
566 	if (uinfo == NULL || uctl == NULL)
567 		return;
568 	if (kctl->info(kctl, uinfo))
569 		return;
570 	if (kctl->get(kctl, uctl))
571 		return;
572 	if (!uctl->value.integer.value[0]) {
573 		*left = 0;
574 		if (uinfo->count == 1)
575 			*right = 0;
576 	}
577 	if (uinfo->count > 1 && !uctl->value.integer.value[route ? 3 : 1])
578 		*right = 0;
579 }
580 
snd_mixer_oss_get_volume1(struct snd_mixer_oss_file * fmixer,struct snd_mixer_oss_slot * pslot,int * left,int * right)581 static int snd_mixer_oss_get_volume1(struct snd_mixer_oss_file *fmixer,
582 				     struct snd_mixer_oss_slot *pslot,
583 				     int *left, int *right)
584 {
585 	struct slot *slot = pslot->private_data;
586 
587 	*left = *right = 100;
588 	if (slot->present & SNDRV_MIXER_OSS_PRESENT_PVOLUME) {
589 		snd_mixer_oss_get_volume1_vol(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_PVOLUME], left, right);
590 	} else if (slot->present & SNDRV_MIXER_OSS_PRESENT_GVOLUME) {
591 		snd_mixer_oss_get_volume1_vol(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_GVOLUME], left, right);
592 	} else if (slot->present & SNDRV_MIXER_OSS_PRESENT_GLOBAL) {
593 		snd_mixer_oss_get_volume1_vol(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_GLOBAL], left, right);
594 	}
595 	if (slot->present & SNDRV_MIXER_OSS_PRESENT_PSWITCH) {
596 		snd_mixer_oss_get_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_PSWITCH], left, right, 0);
597 	} else if (slot->present & SNDRV_MIXER_OSS_PRESENT_GSWITCH) {
598 		snd_mixer_oss_get_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_GSWITCH], left, right, 0);
599 	} else if (slot->present & SNDRV_MIXER_OSS_PRESENT_PROUTE) {
600 		snd_mixer_oss_get_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_PROUTE], left, right, 1);
601 	} else if (slot->present & SNDRV_MIXER_OSS_PRESENT_GROUTE) {
602 		snd_mixer_oss_get_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_GROUTE], left, right, 1);
603 	}
604 	return 0;
605 }
606 
snd_mixer_oss_put_volume1_vol(struct snd_mixer_oss_file * fmixer,struct snd_mixer_oss_slot * pslot,unsigned int numid,int left,int right)607 static void snd_mixer_oss_put_volume1_vol(struct snd_mixer_oss_file *fmixer,
608 					  struct snd_mixer_oss_slot *pslot,
609 					  unsigned int numid,
610 					  int left, int right)
611 {
612 	struct snd_ctl_elem_info *uinfo __free(kfree) = NULL;
613 	struct snd_ctl_elem_value *uctl __free(kfree) = NULL;
614 	struct snd_kcontrol *kctl;
615 	struct snd_card *card = fmixer->card;
616 	int res;
617 
618 	if (numid == ID_UNKNOWN)
619 		return;
620 	guard(rwsem_read)(&card->controls_rwsem);
621 	kctl = snd_ctl_find_numid(card, numid);
622 	if (!kctl)
623 		return;
624 	uinfo = kzalloc(sizeof(*uinfo), GFP_KERNEL);
625 	uctl = kzalloc(sizeof(*uctl), GFP_KERNEL);
626 	if (uinfo == NULL || uctl == NULL)
627 		return;
628 	if (kctl->info(kctl, uinfo))
629 		return;
630 	if (uinfo->type == SNDRV_CTL_ELEM_TYPE_BOOLEAN &&
631 	    uinfo->value.integer.min == 0 && uinfo->value.integer.max == 1)
632 		return;
633 	uctl->value.integer.value[0] = snd_mixer_oss_conv2(left, uinfo->value.integer.min, uinfo->value.integer.max);
634 	if (uinfo->count > 1)
635 		uctl->value.integer.value[1] = snd_mixer_oss_conv2(right, uinfo->value.integer.min, uinfo->value.integer.max);
636 	res = kctl->put(kctl, uctl);
637 	if (res < 0)
638 		return;
639 	if (res > 0)
640 		snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, &kctl->id);
641 }
642 
snd_mixer_oss_put_volume1_sw(struct snd_mixer_oss_file * fmixer,struct snd_mixer_oss_slot * pslot,unsigned int numid,int left,int right,int route)643 static void snd_mixer_oss_put_volume1_sw(struct snd_mixer_oss_file *fmixer,
644 					 struct snd_mixer_oss_slot *pslot,
645 					 unsigned int numid,
646 					 int left, int right,
647 					 int route)
648 {
649 	struct snd_ctl_elem_info *uinfo __free(kfree) = NULL;
650 	struct snd_ctl_elem_value *uctl __free(kfree) = NULL;
651 	struct snd_kcontrol *kctl;
652 	struct snd_card *card = fmixer->card;
653 	int res;
654 
655 	if (numid == ID_UNKNOWN)
656 		return;
657 	guard(rwsem_read)(&card->controls_rwsem);
658 	kctl = snd_ctl_find_numid(card, numid);
659 	if (!kctl)
660 		return;
661 	uinfo = kzalloc(sizeof(*uinfo), GFP_KERNEL);
662 	uctl = kzalloc(sizeof(*uctl), GFP_KERNEL);
663 	if (uinfo == NULL || uctl == NULL)
664 		return;
665 	if (kctl->info(kctl, uinfo))
666 		return;
667 	if (uinfo->count > 1) {
668 		uctl->value.integer.value[0] = left > 0 ? 1 : 0;
669 		uctl->value.integer.value[route ? 3 : 1] = right > 0 ? 1 : 0;
670 		if (route) {
671 			uctl->value.integer.value[1] =
672 			uctl->value.integer.value[2] = 0;
673 		}
674 	} else {
675 		uctl->value.integer.value[0] = (left > 0 || right > 0) ? 1 : 0;
676 	}
677 	res = kctl->put(kctl, uctl);
678 	if (res < 0)
679 		return;
680 	if (res > 0)
681 		snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, &kctl->id);
682 }
683 
snd_mixer_oss_put_volume1(struct snd_mixer_oss_file * fmixer,struct snd_mixer_oss_slot * pslot,int left,int right)684 static int snd_mixer_oss_put_volume1(struct snd_mixer_oss_file *fmixer,
685 				     struct snd_mixer_oss_slot *pslot,
686 				     int left, int right)
687 {
688 	struct slot *slot = pslot->private_data;
689 
690 	if (slot->present & SNDRV_MIXER_OSS_PRESENT_PVOLUME) {
691 		snd_mixer_oss_put_volume1_vol(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_PVOLUME], left, right);
692 		if (slot->present & SNDRV_MIXER_OSS_PRESENT_CVOLUME)
693 			snd_mixer_oss_put_volume1_vol(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_CVOLUME], left, right);
694 	} else if (slot->present & SNDRV_MIXER_OSS_PRESENT_CVOLUME) {
695 		snd_mixer_oss_put_volume1_vol(fmixer, pslot,
696 			slot->numid[SNDRV_MIXER_OSS_ITEM_CVOLUME], left, right);
697 	} else if (slot->present & SNDRV_MIXER_OSS_PRESENT_GVOLUME) {
698 		snd_mixer_oss_put_volume1_vol(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_GVOLUME], left, right);
699 	} else if (slot->present & SNDRV_MIXER_OSS_PRESENT_GLOBAL) {
700 		snd_mixer_oss_put_volume1_vol(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_GLOBAL], left, right);
701 	}
702 	if (left || right) {
703 		if (slot->present & SNDRV_MIXER_OSS_PRESENT_PSWITCH)
704 			snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_PSWITCH], left, right, 0);
705 		if (slot->present & SNDRV_MIXER_OSS_PRESENT_CSWITCH)
706 			snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_CSWITCH], left, right, 0);
707 		if (slot->present & SNDRV_MIXER_OSS_PRESENT_GSWITCH)
708 			snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_GSWITCH], left, right, 0);
709 		if (slot->present & SNDRV_MIXER_OSS_PRESENT_PROUTE)
710 			snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_PROUTE], left, right, 1);
711 		if (slot->present & SNDRV_MIXER_OSS_PRESENT_CROUTE)
712 			snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_CROUTE], left, right, 1);
713 		if (slot->present & SNDRV_MIXER_OSS_PRESENT_GROUTE)
714 			snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_GROUTE], left, right, 1);
715 	} else {
716 		if (slot->present & SNDRV_MIXER_OSS_PRESENT_PSWITCH) {
717 			snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_PSWITCH], left, right, 0);
718 		} else if (slot->present & SNDRV_MIXER_OSS_PRESENT_CSWITCH) {
719 			snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_CSWITCH], left, right, 0);
720 		} else if (slot->present & SNDRV_MIXER_OSS_PRESENT_GSWITCH) {
721 			snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_GSWITCH], left, right, 0);
722 		} else if (slot->present & SNDRV_MIXER_OSS_PRESENT_PROUTE) {
723 			snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_PROUTE], left, right, 1);
724 		} else if (slot->present & SNDRV_MIXER_OSS_PRESENT_CROUTE) {
725 			snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_CROUTE], left, right, 1);
726 		} else if (slot->present & SNDRV_MIXER_OSS_PRESENT_GROUTE) {
727 			snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_GROUTE], left, right, 1);
728 		}
729 	}
730 	return 0;
731 }
732 
snd_mixer_oss_get_recsrc1_sw(struct snd_mixer_oss_file * fmixer,struct snd_mixer_oss_slot * pslot,int * active)733 static int snd_mixer_oss_get_recsrc1_sw(struct snd_mixer_oss_file *fmixer,
734 					struct snd_mixer_oss_slot *pslot,
735 					int *active)
736 {
737 	struct slot *slot = pslot->private_data;
738 	int left, right;
739 
740 	left = right = 1;
741 	snd_mixer_oss_get_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_CSWITCH], &left, &right, 0);
742 	*active = (left || right) ? 1 : 0;
743 	return 0;
744 }
745 
snd_mixer_oss_get_recsrc1_route(struct snd_mixer_oss_file * fmixer,struct snd_mixer_oss_slot * pslot,int * active)746 static int snd_mixer_oss_get_recsrc1_route(struct snd_mixer_oss_file *fmixer,
747 					   struct snd_mixer_oss_slot *pslot,
748 					   int *active)
749 {
750 	struct slot *slot = pslot->private_data;
751 	int left, right;
752 
753 	left = right = 1;
754 	snd_mixer_oss_get_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_CROUTE], &left, &right, 1);
755 	*active = (left || right) ? 1 : 0;
756 	return 0;
757 }
758 
snd_mixer_oss_put_recsrc1_sw(struct snd_mixer_oss_file * fmixer,struct snd_mixer_oss_slot * pslot,int active)759 static int snd_mixer_oss_put_recsrc1_sw(struct snd_mixer_oss_file *fmixer,
760 					struct snd_mixer_oss_slot *pslot,
761 					int active)
762 {
763 	struct slot *slot = pslot->private_data;
764 
765 	snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_CSWITCH], active, active, 0);
766 	return 0;
767 }
768 
snd_mixer_oss_put_recsrc1_route(struct snd_mixer_oss_file * fmixer,struct snd_mixer_oss_slot * pslot,int active)769 static int snd_mixer_oss_put_recsrc1_route(struct snd_mixer_oss_file *fmixer,
770 					   struct snd_mixer_oss_slot *pslot,
771 					   int active)
772 {
773 	struct slot *slot = pslot->private_data;
774 
775 	snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->numid[SNDRV_MIXER_OSS_ITEM_CROUTE], active, active, 1);
776 	return 0;
777 }
778 
snd_mixer_oss_get_recsrc2(struct snd_mixer_oss_file * fmixer,unsigned int * active_index)779 static int snd_mixer_oss_get_recsrc2(struct snd_mixer_oss_file *fmixer, unsigned int *active_index)
780 {
781 	struct snd_card *card = fmixer->card;
782 	struct snd_mixer_oss *mixer = fmixer->mixer;
783 	struct snd_kcontrol *kctl;
784 	struct snd_mixer_oss_slot *pslot;
785 	struct slot *slot;
786 	struct snd_ctl_elem_info *uinfo __free(kfree) = NULL;
787 	struct snd_ctl_elem_value *uctl __free(kfree) = NULL;
788 	int err, idx;
789 
790 	uinfo = kzalloc(sizeof(*uinfo), GFP_KERNEL);
791 	uctl = kzalloc(sizeof(*uctl), GFP_KERNEL);
792 	if (uinfo == NULL || uctl == NULL)
793 		return -ENOMEM;
794 	guard(rwsem_read)(&card->controls_rwsem);
795 	kctl = snd_mixer_oss_test_id(mixer, "Capture Source", 0);
796 	if (!kctl)
797 		return -ENOENT;
798 	err = kctl->info(kctl, uinfo);
799 	if (err < 0)
800 		return err;
801 	err = kctl->get(kctl, uctl);
802 	if (err < 0)
803 		return err;
804 	for (idx = 0; idx < 32; idx++) {
805 		if (!(mixer->mask_recsrc & (1 << idx)))
806 			continue;
807 		pslot = &mixer->slots[idx];
808 		slot = pslot->private_data;
809 		if (slot->signature != SNDRV_MIXER_OSS_SIGNATURE)
810 			continue;
811 		if (!(slot->present & SNDRV_MIXER_OSS_PRESENT_CAPTURE))
812 			continue;
813 		if (slot->capture_item == uctl->value.enumerated.item[0]) {
814 			*active_index = idx;
815 			break;
816 		}
817 	}
818 	return 0;
819 }
820 
snd_mixer_oss_put_recsrc2(struct snd_mixer_oss_file * fmixer,unsigned int active_index)821 static int snd_mixer_oss_put_recsrc2(struct snd_mixer_oss_file *fmixer, unsigned int active_index)
822 {
823 	struct snd_card *card = fmixer->card;
824 	struct snd_mixer_oss *mixer = fmixer->mixer;
825 	struct snd_kcontrol *kctl;
826 	struct snd_mixer_oss_slot *pslot;
827 	struct slot *slot = NULL;
828 	struct snd_ctl_elem_info *uinfo __free(kfree) = NULL;
829 	struct snd_ctl_elem_value *uctl __free(kfree) = NULL;
830 	int err;
831 	unsigned int idx;
832 
833 	uinfo = kzalloc(sizeof(*uinfo), GFP_KERNEL);
834 	uctl = kzalloc(sizeof(*uctl), GFP_KERNEL);
835 	if (uinfo == NULL || uctl == NULL)
836 		return -ENOMEM;
837 	guard(rwsem_read)(&card->controls_rwsem);
838 	kctl = snd_mixer_oss_test_id(mixer, "Capture Source", 0);
839 	if (!kctl)
840 		return -ENOENT;
841 	err = kctl->info(kctl, uinfo);
842 	if (err < 0)
843 		return err;
844 	for (idx = 0; idx < 32; idx++) {
845 		if (!(mixer->mask_recsrc & (1 << idx)))
846 			continue;
847 		pslot = &mixer->slots[idx];
848 		slot = pslot->private_data;
849 		if (slot->signature != SNDRV_MIXER_OSS_SIGNATURE)
850 			continue;
851 		if (!(slot->present & SNDRV_MIXER_OSS_PRESENT_CAPTURE))
852 			continue;
853 		if (idx == active_index)
854 			break;
855 		slot = NULL;
856 	}
857 	if (!slot)
858 		return 0;
859 	for (idx = 0; idx < uinfo->count; idx++)
860 		uctl->value.enumerated.item[idx] = slot->capture_item;
861 	err = kctl->put(kctl, uctl);
862 	if (err > 0)
863 		snd_ctl_notify(fmixer->card, SNDRV_CTL_EVENT_MASK_VALUE, &kctl->id);
864 	return 0;
865 }
866 
867 struct snd_mixer_oss_assign_table {
868 	int oss_id;
869 	const char *name;
870 	int index;
871 };
872 
snd_mixer_oss_build_test(struct snd_mixer_oss * mixer,struct slot * slot,const char * name,int index,int item)873 static int snd_mixer_oss_build_test(struct snd_mixer_oss *mixer, struct slot *slot, const char *name, int index, int item)
874 {
875 	struct snd_ctl_elem_info *info __free(kfree) = NULL;
876 	struct snd_kcontrol *kcontrol;
877 	struct snd_card *card = mixer->card;
878 	int err;
879 
880 	scoped_guard(rwsem_read, &card->controls_rwsem) {
881 		kcontrol = snd_mixer_oss_test_id(mixer, name, index);
882 		if (kcontrol == NULL)
883 			return 0;
884 		info = kmalloc(sizeof(*info), GFP_KERNEL);
885 		if (!info)
886 			return -ENOMEM;
887 		err = kcontrol->info(kcontrol, info);
888 		if (err < 0)
889 			return err;
890 		slot->numid[item] = kcontrol->id.numid;
891 	}
892 	if (info->count > slot->channels)
893 		slot->channels = info->count;
894 	slot->present |= 1 << item;
895 	return 0;
896 }
897 
snd_mixer_oss_slot_free(struct snd_mixer_oss_slot * chn)898 static void snd_mixer_oss_slot_free(struct snd_mixer_oss_slot *chn)
899 {
900 	struct slot *p = chn->private_data;
901 	if (p) {
902 		if (p->allocated && p->assigned) {
903 			kfree(p->assigned->name);
904 			kfree(p->assigned);
905 		}
906 		kfree(p);
907 	}
908 }
909 
mixer_slot_clear(struct snd_mixer_oss_slot * rslot)910 static void mixer_slot_clear(struct snd_mixer_oss_slot *rslot)
911 {
912 	int idx = rslot->number; /* remember this */
913 	if (rslot->private_free)
914 		rslot->private_free(rslot);
915 	memset(rslot, 0, sizeof(*rslot));
916 	rslot->number = idx;
917 }
918 
919 /* In a separate function to keep gcc 3.2 happy - do NOT merge this in
920    snd_mixer_oss_build_input! */
snd_mixer_oss_build_test_all(struct snd_mixer_oss * mixer,const struct snd_mixer_oss_assign_table * ptr,struct slot * slot)921 static int snd_mixer_oss_build_test_all(struct snd_mixer_oss *mixer,
922 					const struct snd_mixer_oss_assign_table *ptr,
923 					struct slot *slot)
924 {
925 	char str[64];
926 	int err;
927 
928 	err = snd_mixer_oss_build_test(mixer, slot, ptr->name, ptr->index,
929 				       SNDRV_MIXER_OSS_ITEM_GLOBAL);
930 	if (err)
931 		return err;
932 	sprintf(str, "%s Switch", ptr->name);
933 	err = snd_mixer_oss_build_test(mixer, slot, str, ptr->index,
934 				       SNDRV_MIXER_OSS_ITEM_GSWITCH);
935 	if (err)
936 		return err;
937 	sprintf(str, "%s Route", ptr->name);
938 	err = snd_mixer_oss_build_test(mixer, slot, str, ptr->index,
939 				       SNDRV_MIXER_OSS_ITEM_GROUTE);
940 	if (err)
941 		return err;
942 	sprintf(str, "%s Volume", ptr->name);
943 	err = snd_mixer_oss_build_test(mixer, slot, str, ptr->index,
944 				       SNDRV_MIXER_OSS_ITEM_GVOLUME);
945 	if (err)
946 		return err;
947 	sprintf(str, "%s Playback Switch", ptr->name);
948 	err = snd_mixer_oss_build_test(mixer, slot, str, ptr->index,
949 				       SNDRV_MIXER_OSS_ITEM_PSWITCH);
950 	if (err)
951 		return err;
952 	sprintf(str, "%s Playback Route", ptr->name);
953 	err = snd_mixer_oss_build_test(mixer, slot, str, ptr->index,
954 				       SNDRV_MIXER_OSS_ITEM_PROUTE);
955 	if (err)
956 		return err;
957 	sprintf(str, "%s Playback Volume", ptr->name);
958 	err = snd_mixer_oss_build_test(mixer, slot, str, ptr->index,
959 				       SNDRV_MIXER_OSS_ITEM_PVOLUME);
960 	if (err)
961 		return err;
962 	sprintf(str, "%s Capture Switch", ptr->name);
963 	err = snd_mixer_oss_build_test(mixer, slot, str, ptr->index,
964 				       SNDRV_MIXER_OSS_ITEM_CSWITCH);
965 	if (err)
966 		return err;
967 	sprintf(str, "%s Capture Route", ptr->name);
968 	err = snd_mixer_oss_build_test(mixer, slot, str, ptr->index,
969 				       SNDRV_MIXER_OSS_ITEM_CROUTE);
970 	if (err)
971 		return err;
972 	sprintf(str, "%s Capture Volume", ptr->name);
973 	err = snd_mixer_oss_build_test(mixer, slot, str, ptr->index,
974 				       SNDRV_MIXER_OSS_ITEM_CVOLUME);
975 	if (err)
976 		return err;
977 
978 	return 0;
979 }
980 
981 /*
982  * build an OSS mixer element.
983  * ptr_allocated means the entry is dynamically allocated (change via proc file).
984  * when replace_old = 1, the old entry is replaced with the new one.
985  */
snd_mixer_oss_build_input(struct snd_mixer_oss * mixer,const struct snd_mixer_oss_assign_table * ptr,int ptr_allocated,int replace_old)986 static int snd_mixer_oss_build_input(struct snd_mixer_oss *mixer,
987 				     const struct snd_mixer_oss_assign_table *ptr,
988 				     int ptr_allocated, int replace_old)
989 {
990 	struct slot slot;
991 	struct slot *pslot;
992 	struct snd_kcontrol *kctl;
993 	struct snd_mixer_oss_slot *rslot;
994 	char str[64];
995 
996 	/* check if already assigned */
997 	if (mixer->slots[ptr->oss_id].get_volume && ! replace_old)
998 		return 0;
999 
1000 	memset(&slot, 0, sizeof(slot));
1001 	memset(slot.numid, 0xff, sizeof(slot.numid)); /* ID_UNKNOWN */
1002 	if (snd_mixer_oss_build_test_all(mixer, ptr, &slot))
1003 		return 0;
1004 	guard(rwsem_read)(&mixer->card->controls_rwsem);
1005 	kctl = NULL;
1006 	if (!ptr->index)
1007 		kctl = snd_mixer_oss_test_id(mixer, "Capture Source", 0);
1008 	if (kctl) {
1009 		struct snd_ctl_elem_info *uinfo __free(kfree) = NULL;
1010 
1011 		uinfo = kzalloc(sizeof(*uinfo), GFP_KERNEL);
1012 		if (!uinfo)
1013 			return -ENOMEM;
1014 
1015 		if (kctl->info(kctl, uinfo))
1016 			return 0;
1017 		strcpy(str, ptr->name);
1018 		if (!strcmp(str, "Master"))
1019 			strcpy(str, "Mix");
1020 		if (!strcmp(str, "Master Mono"))
1021 			strcpy(str, "Mix Mono");
1022 		slot.capture_item = 0;
1023 		if (!strcmp(uinfo->value.enumerated.name, str)) {
1024 			slot.present |= SNDRV_MIXER_OSS_PRESENT_CAPTURE;
1025 		} else {
1026 			for (slot.capture_item = 1; slot.capture_item < uinfo->value.enumerated.items; slot.capture_item++) {
1027 				uinfo->value.enumerated.item = slot.capture_item;
1028 				if (kctl->info(kctl, uinfo))
1029 					return 0;
1030 				if (!strcmp(uinfo->value.enumerated.name, str)) {
1031 					slot.present |= SNDRV_MIXER_OSS_PRESENT_CAPTURE;
1032 					break;
1033 				}
1034 			}
1035 		}
1036 	}
1037 	if (slot.present != 0) {
1038 		pslot = kmalloc(sizeof(slot), GFP_KERNEL);
1039 		if (! pslot)
1040 			return -ENOMEM;
1041 		*pslot = slot;
1042 		pslot->signature = SNDRV_MIXER_OSS_SIGNATURE;
1043 		pslot->assigned = ptr;
1044 		pslot->allocated = ptr_allocated;
1045 		rslot = &mixer->slots[ptr->oss_id];
1046 		mixer_slot_clear(rslot);
1047 		rslot->stereo = slot.channels > 1 ? 1 : 0;
1048 		rslot->get_volume = snd_mixer_oss_get_volume1;
1049 		rslot->put_volume = snd_mixer_oss_put_volume1;
1050 		/* note: ES18xx have both Capture Source and XX Capture Volume !!! */
1051 		if (slot.present & SNDRV_MIXER_OSS_PRESENT_CSWITCH) {
1052 			rslot->get_recsrc = snd_mixer_oss_get_recsrc1_sw;
1053 			rslot->put_recsrc = snd_mixer_oss_put_recsrc1_sw;
1054 		} else if (slot.present & SNDRV_MIXER_OSS_PRESENT_CROUTE) {
1055 			rslot->get_recsrc = snd_mixer_oss_get_recsrc1_route;
1056 			rslot->put_recsrc = snd_mixer_oss_put_recsrc1_route;
1057 		} else if (slot.present & SNDRV_MIXER_OSS_PRESENT_CAPTURE) {
1058 			mixer->mask_recsrc |= 1 << ptr->oss_id;
1059 		}
1060 		rslot->private_data = pslot;
1061 		rslot->private_free = snd_mixer_oss_slot_free;
1062 		return 1;
1063 	}
1064 	return 0;
1065 }
1066 
1067 #ifdef CONFIG_SND_PROC_FS
1068 /*
1069  */
1070 #define MIXER_VOL(name) [SOUND_MIXER_##name] = #name
1071 static const char * const oss_mixer_names[SNDRV_OSS_MAX_MIXERS] = {
1072 	MIXER_VOL(VOLUME),
1073 	MIXER_VOL(BASS),
1074 	MIXER_VOL(TREBLE),
1075 	MIXER_VOL(SYNTH),
1076 	MIXER_VOL(PCM),
1077 	MIXER_VOL(SPEAKER),
1078 	MIXER_VOL(LINE),
1079 	MIXER_VOL(MIC),
1080 	MIXER_VOL(CD),
1081 	MIXER_VOL(IMIX),
1082 	MIXER_VOL(ALTPCM),
1083 	MIXER_VOL(RECLEV),
1084 	MIXER_VOL(IGAIN),
1085 	MIXER_VOL(OGAIN),
1086 	MIXER_VOL(LINE1),
1087 	MIXER_VOL(LINE2),
1088 	MIXER_VOL(LINE3),
1089 	MIXER_VOL(DIGITAL1),
1090 	MIXER_VOL(DIGITAL2),
1091 	MIXER_VOL(DIGITAL3),
1092 	MIXER_VOL(PHONEIN),
1093 	MIXER_VOL(PHONEOUT),
1094 	MIXER_VOL(VIDEO),
1095 	MIXER_VOL(RADIO),
1096 	MIXER_VOL(MONITOR),
1097 };
1098 
1099 /*
1100  *  /proc interface
1101  */
1102 
snd_mixer_oss_proc_read(struct snd_info_entry * entry,struct snd_info_buffer * buffer)1103 static void snd_mixer_oss_proc_read(struct snd_info_entry *entry,
1104 				    struct snd_info_buffer *buffer)
1105 {
1106 	struct snd_mixer_oss *mixer = entry->private_data;
1107 	int i;
1108 
1109 	guard(mutex)(&mixer->reg_mutex);
1110 	for (i = 0; i < SNDRV_OSS_MAX_MIXERS; i++) {
1111 		struct slot *p;
1112 
1113 		if (! oss_mixer_names[i])
1114 			continue;
1115 		p = (struct slot *)mixer->slots[i].private_data;
1116 		snd_iprintf(buffer, "%s ", oss_mixer_names[i]);
1117 		if (p && p->assigned)
1118 			snd_iprintf(buffer, "\"%s\" %d\n",
1119 				    p->assigned->name,
1120 				    p->assigned->index);
1121 		else
1122 			snd_iprintf(buffer, "\"\" 0\n");
1123 	}
1124 }
1125 
snd_mixer_oss_proc_write(struct snd_info_entry * entry,struct snd_info_buffer * buffer)1126 static void snd_mixer_oss_proc_write(struct snd_info_entry *entry,
1127 				     struct snd_info_buffer *buffer)
1128 {
1129 	struct snd_mixer_oss *mixer = entry->private_data;
1130 	char line[128], str[32], idxstr[16];
1131 	const char *cptr;
1132 	unsigned int idx;
1133 	int ch;
1134 	struct snd_mixer_oss_assign_table *tbl;
1135 	struct slot *slot;
1136 
1137 	while (!snd_info_get_line(buffer, line, sizeof(line))) {
1138 		cptr = snd_info_get_str(str, line, sizeof(str));
1139 		for (ch = 0; ch < SNDRV_OSS_MAX_MIXERS; ch++)
1140 			if (oss_mixer_names[ch] && strcmp(oss_mixer_names[ch], str) == 0)
1141 				break;
1142 		if (ch >= SNDRV_OSS_MAX_MIXERS) {
1143 			pr_err("ALSA: mixer_oss: invalid OSS volume '%s'\n",
1144 			       str);
1145 			continue;
1146 		}
1147 		cptr = snd_info_get_str(str, cptr, sizeof(str));
1148 		if (! *str) {
1149 			/* remove the entry */
1150 			scoped_guard(mutex, &mixer->reg_mutex)
1151 				mixer_slot_clear(&mixer->slots[ch]);
1152 			continue;
1153 		}
1154 		snd_info_get_str(idxstr, cptr, sizeof(idxstr));
1155 		idx = simple_strtoul(idxstr, NULL, 10);
1156 		if (idx >= 0x4000) { /* too big */
1157 			pr_err("ALSA: mixer_oss: invalid index %d\n", idx);
1158 			continue;
1159 		}
1160 		scoped_guard(mutex, &mixer->reg_mutex) {
1161 			slot = (struct slot *)mixer->slots[ch].private_data;
1162 			if (slot && slot->assigned &&
1163 			    slot->assigned->index == idx && !strcmp(slot->assigned->name, str))
1164 				/* not changed */
1165 				break;
1166 			tbl = kmalloc(sizeof(*tbl), GFP_KERNEL);
1167 			if (!tbl)
1168 				break;
1169 			tbl->oss_id = ch;
1170 			tbl->name = kstrdup(str, GFP_KERNEL);
1171 			if (!tbl->name) {
1172 				kfree(tbl);
1173 				break;
1174 			}
1175 			tbl->index = idx;
1176 			if (snd_mixer_oss_build_input(mixer, tbl, 1, 1) <= 0) {
1177 				kfree(tbl->name);
1178 				kfree(tbl);
1179 			}
1180 		}
1181 	}
1182 }
1183 
snd_mixer_oss_proc_init(struct snd_mixer_oss * mixer)1184 static void snd_mixer_oss_proc_init(struct snd_mixer_oss *mixer)
1185 {
1186 	struct snd_info_entry *entry;
1187 
1188 	entry = snd_info_create_card_entry(mixer->card, "oss_mixer",
1189 					   mixer->card->proc_root);
1190 	if (! entry)
1191 		return;
1192 	entry->content = SNDRV_INFO_CONTENT_TEXT;
1193 	entry->mode = S_IFREG | 0644;
1194 	entry->c.text.read = snd_mixer_oss_proc_read;
1195 	entry->c.text.write = snd_mixer_oss_proc_write;
1196 	entry->private_data = mixer;
1197 	if (snd_info_register(entry) < 0) {
1198 		snd_info_free_entry(entry);
1199 		entry = NULL;
1200 	}
1201 	mixer->proc_entry = entry;
1202 }
1203 
snd_mixer_oss_proc_done(struct snd_mixer_oss * mixer)1204 static void snd_mixer_oss_proc_done(struct snd_mixer_oss *mixer)
1205 {
1206 	snd_info_free_entry(mixer->proc_entry);
1207 	mixer->proc_entry = NULL;
1208 }
1209 #else /* !CONFIG_SND_PROC_FS */
1210 #define snd_mixer_oss_proc_init(mix)
1211 #define snd_mixer_oss_proc_done(mix)
1212 #endif /* CONFIG_SND_PROC_FS */
1213 
snd_mixer_oss_build(struct snd_mixer_oss * mixer)1214 static void snd_mixer_oss_build(struct snd_mixer_oss *mixer)
1215 {
1216 	static const struct snd_mixer_oss_assign_table table[] = {
1217 		{ SOUND_MIXER_VOLUME, 	"Master",		0 },
1218 		{ SOUND_MIXER_VOLUME, 	"Front",		0 }, /* fallback */
1219 		{ SOUND_MIXER_BASS,	"Tone Control - Bass",	0 },
1220 		{ SOUND_MIXER_TREBLE,	"Tone Control - Treble", 0 },
1221 		{ SOUND_MIXER_SYNTH,	"Synth",		0 },
1222 		{ SOUND_MIXER_SYNTH,	"FM",			0 }, /* fallback */
1223 		{ SOUND_MIXER_SYNTH,	"Music",		0 }, /* fallback */
1224 		{ SOUND_MIXER_PCM,	"PCM",			0 },
1225 		{ SOUND_MIXER_SPEAKER,	"Beep", 		0 },
1226 		{ SOUND_MIXER_SPEAKER,	"PC Speaker", 		0 }, /* fallback */
1227 		{ SOUND_MIXER_SPEAKER,	"Speaker", 		0 }, /* fallback */
1228 		{ SOUND_MIXER_LINE,	"Line", 		0 },
1229 		{ SOUND_MIXER_MIC,	"Mic", 			0 },
1230 		{ SOUND_MIXER_CD,	"CD", 			0 },
1231 		{ SOUND_MIXER_IMIX,	"Monitor Mix", 		0 },
1232 		{ SOUND_MIXER_ALTPCM,	"PCM",			1 },
1233 		{ SOUND_MIXER_ALTPCM,	"Headphone",		0 }, /* fallback */
1234 		{ SOUND_MIXER_ALTPCM,	"Wave",			0 }, /* fallback */
1235 		{ SOUND_MIXER_RECLEV,	"-- nothing --",	0 },
1236 		{ SOUND_MIXER_IGAIN,	"Capture",		0 },
1237 		{ SOUND_MIXER_OGAIN,	"Playback",		0 },
1238 		{ SOUND_MIXER_LINE1,	"Aux",			0 },
1239 		{ SOUND_MIXER_LINE2,	"Aux",			1 },
1240 		{ SOUND_MIXER_LINE3,	"Aux",			2 },
1241 		{ SOUND_MIXER_DIGITAL1,	"Digital",		0 },
1242 		{ SOUND_MIXER_DIGITAL1,	"IEC958",		0 }, /* fallback */
1243 		{ SOUND_MIXER_DIGITAL1,	"IEC958 Optical",	0 }, /* fallback */
1244 		{ SOUND_MIXER_DIGITAL1,	"IEC958 Coaxial",	0 }, /* fallback */
1245 		{ SOUND_MIXER_DIGITAL2,	"Digital",		1 },
1246 		{ SOUND_MIXER_DIGITAL3,	"Digital",		2 },
1247 		{ SOUND_MIXER_PHONEIN,	"Phone",		0 },
1248 		{ SOUND_MIXER_PHONEOUT,	"Master Mono",		0 },
1249 		{ SOUND_MIXER_PHONEOUT,	"Speaker",		0 }, /*fallback*/
1250 		{ SOUND_MIXER_PHONEOUT,	"Mono",			0 }, /*fallback*/
1251 		{ SOUND_MIXER_PHONEOUT,	"Phone",		0 }, /* fallback */
1252 		{ SOUND_MIXER_VIDEO,	"Video",		0 },
1253 		{ SOUND_MIXER_RADIO,	"Radio",		0 },
1254 		{ SOUND_MIXER_MONITOR,	"Monitor",		0 }
1255 	};
1256 	unsigned int idx;
1257 
1258 	for (idx = 0; idx < ARRAY_SIZE(table); idx++)
1259 		snd_mixer_oss_build_input(mixer, &table[idx], 0, 0);
1260 	if (mixer->mask_recsrc) {
1261 		mixer->get_recsrc = snd_mixer_oss_get_recsrc2;
1262 		mixer->put_recsrc = snd_mixer_oss_put_recsrc2;
1263 	}
1264 }
1265 
1266 /*
1267  *
1268  */
1269 
snd_mixer_oss_free1(void * private)1270 static int snd_mixer_oss_free1(void *private)
1271 {
1272 	struct snd_mixer_oss *mixer = private;
1273 	struct snd_card *card;
1274 	int idx;
1275 
1276 	if (!mixer)
1277 		return 0;
1278 	card = mixer->card;
1279 	if (snd_BUG_ON(mixer != card->mixer_oss))
1280 		return -ENXIO;
1281 	card->mixer_oss = NULL;
1282 	for (idx = 0; idx < SNDRV_OSS_MAX_MIXERS; idx++) {
1283 		struct snd_mixer_oss_slot *chn = &mixer->slots[idx];
1284 		if (chn->private_free)
1285 			chn->private_free(chn);
1286 	}
1287 	kfree(mixer);
1288 	return 0;
1289 }
1290 
snd_mixer_oss_notify_handler(struct snd_card * card,int cmd)1291 static int snd_mixer_oss_notify_handler(struct snd_card *card, int cmd)
1292 {
1293 	struct snd_mixer_oss *mixer;
1294 
1295 	if (cmd == SND_MIXER_OSS_NOTIFY_REGISTER) {
1296 		int idx, err;
1297 
1298 		mixer = kcalloc(2, sizeof(*mixer), GFP_KERNEL);
1299 		if (mixer == NULL)
1300 			return -ENOMEM;
1301 		mutex_init(&mixer->reg_mutex);
1302 		err = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIXER,
1303 					      card, 0,
1304 					      &snd_mixer_oss_f_ops, card);
1305 		if (err < 0) {
1306 			dev_err(card->dev,
1307 				"unable to register OSS mixer device %i:%i\n",
1308 				card->number, 0);
1309 			kfree(mixer);
1310 			return err;
1311 		}
1312 		mixer->oss_dev_alloc = 1;
1313 		mixer->card = card;
1314 		if (*card->mixername)
1315 			strscpy(mixer->name, card->mixername, sizeof(mixer->name));
1316 		else
1317 			snprintf(mixer->name, sizeof(mixer->name),
1318 				 "mixer%i", card->number);
1319 #ifdef SNDRV_OSS_INFO_DEV_MIXERS
1320 		snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIXERS,
1321 				      card->number,
1322 				      mixer->name);
1323 #endif
1324 		for (idx = 0; idx < SNDRV_OSS_MAX_MIXERS; idx++)
1325 			mixer->slots[idx].number = idx;
1326 		card->mixer_oss = mixer;
1327 		snd_mixer_oss_build(mixer);
1328 		snd_mixer_oss_proc_init(mixer);
1329 	} else {
1330 		mixer = card->mixer_oss;
1331 		if (mixer == NULL)
1332 			return 0;
1333 		if (mixer->oss_dev_alloc) {
1334 #ifdef SNDRV_OSS_INFO_DEV_MIXERS
1335 			snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIXERS, mixer->card->number);
1336 #endif
1337 			snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIXER, mixer->card, 0);
1338 			mixer->oss_dev_alloc = 0;
1339 		}
1340 		if (cmd == SND_MIXER_OSS_NOTIFY_DISCONNECT)
1341 			return 0;
1342 		snd_mixer_oss_proc_done(mixer);
1343 		return snd_mixer_oss_free1(mixer);
1344 	}
1345 	return 0;
1346 }
1347 
alsa_mixer_oss_init(void)1348 static int __init alsa_mixer_oss_init(void)
1349 {
1350 	struct snd_card *card;
1351 	int idx;
1352 
1353 	snd_mixer_oss_notify_callback = snd_mixer_oss_notify_handler;
1354 	for (idx = 0; idx < SNDRV_CARDS; idx++) {
1355 		card = snd_card_ref(idx);
1356 		if (card) {
1357 			snd_mixer_oss_notify_handler(card, SND_MIXER_OSS_NOTIFY_REGISTER);
1358 			snd_card_unref(card);
1359 		}
1360 	}
1361 	return 0;
1362 }
1363 
alsa_mixer_oss_exit(void)1364 static void __exit alsa_mixer_oss_exit(void)
1365 {
1366 	struct snd_card *card;
1367 	int idx;
1368 
1369 	snd_mixer_oss_notify_callback = NULL;
1370 	for (idx = 0; idx < SNDRV_CARDS; idx++) {
1371 		card = snd_card_ref(idx);
1372 		if (card) {
1373 			snd_mixer_oss_notify_handler(card, SND_MIXER_OSS_NOTIFY_FREE);
1374 			snd_card_unref(card);
1375 		}
1376 	}
1377 }
1378 
1379 module_init(alsa_mixer_oss_init)
1380 module_exit(alsa_mixer_oss_exit)
1381