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1 | /* |
2 | * Routines for driver control interface |
3 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
4 | * |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License as published by |
8 | * the Free Software Foundation; either version 2 of the License, or |
9 | * (at your option) any later version. |
10 | * |
11 | * This program is distributed in the hope that it will be useful, |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | * GNU General Public License for more details. |
15 | * |
16 | * You should have received a copy of the GNU General Public License |
17 | * along with this program; if not, write to the Free Software |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | * |
20 | */ |
21 | |
22 | #include <linux/threads.h> |
23 | #include <linux/interrupt.h> |
24 | #include <linux/slab.h> |
25 | #include <linux/vmalloc.h> |
26 | #include <linux/time.h> |
27 | #include <sound/core.h> |
28 | #include <sound/minors.h> |
29 | #include <sound/info.h> |
30 | #include <sound/control.h> |
31 | |
32 | /* max number of user-defined controls */ |
33 | #define MAX_USER_CONTROLS 32 |
34 | |
35 | struct snd_kctl_ioctl { |
36 | struct list_head list; /* list of all ioctls */ |
37 | snd_kctl_ioctl_func_t fioctl; |
38 | }; |
39 | |
40 | static DECLARE_RWSEM(snd_ioctl_rwsem); |
41 | static LIST_HEAD(snd_control_ioctls); |
42 | #ifdef CONFIG_COMPAT |
43 | static LIST_HEAD(snd_control_compat_ioctls); |
44 | #endif |
45 | |
46 | static int snd_ctl_open(struct inode *inode, struct file *file) |
47 | { |
48 | unsigned long flags; |
49 | struct snd_card *card; |
50 | struct snd_ctl_file *ctl; |
51 | int err; |
52 | |
53 | card = snd_lookup_minor_data(iminor(inode), SNDRV_DEVICE_TYPE_CONTROL); |
54 | if (!card) { |
55 | err = -ENODEV; |
56 | goto __error1; |
57 | } |
58 | err = snd_card_file_add(card, file); |
59 | if (err < 0) { |
60 | err = -ENODEV; |
61 | goto __error1; |
62 | } |
63 | if (!try_module_get(card->module)) { |
64 | err = -EFAULT; |
65 | goto __error2; |
66 | } |
67 | ctl = kzalloc(sizeof(*ctl), GFP_KERNEL); |
68 | if (ctl == NULL) { |
69 | err = -ENOMEM; |
70 | goto __error; |
71 | } |
72 | INIT_LIST_HEAD(&ctl->events); |
73 | init_waitqueue_head(&ctl->change_sleep); |
74 | spin_lock_init(&ctl->read_lock); |
75 | ctl->card = card; |
76 | ctl->prefer_pcm_subdevice = -1; |
77 | ctl->prefer_rawmidi_subdevice = -1; |
78 | ctl->pid = get_pid(task_pid(current)); |
79 | file->private_data = ctl; |
80 | write_lock_irqsave(&card->ctl_files_rwlock, flags); |
81 | list_add_tail(&ctl->list, &card->ctl_files); |
82 | write_unlock_irqrestore(&card->ctl_files_rwlock, flags); |
83 | return 0; |
84 | |
85 | __error: |
86 | module_put(card->module); |
87 | __error2: |
88 | snd_card_file_remove(card, file); |
89 | __error1: |
90 | return err; |
91 | } |
92 | |
93 | static void snd_ctl_empty_read_queue(struct snd_ctl_file * ctl) |
94 | { |
95 | unsigned long flags; |
96 | struct snd_kctl_event *cread; |
97 | |
98 | spin_lock_irqsave(&ctl->read_lock, flags); |
99 | while (!list_empty(&ctl->events)) { |
100 | cread = snd_kctl_event(ctl->events.next); |
101 | list_del(&cread->list); |
102 | kfree(cread); |
103 | } |
104 | spin_unlock_irqrestore(&ctl->read_lock, flags); |
105 | } |
106 | |
107 | static int snd_ctl_release(struct inode *inode, struct file *file) |
108 | { |
109 | unsigned long flags; |
110 | struct snd_card *card; |
111 | struct snd_ctl_file *ctl; |
112 | struct snd_kcontrol *control; |
113 | unsigned int idx; |
114 | |
115 | ctl = file->private_data; |
116 | file->private_data = NULL; |
117 | card = ctl->card; |
118 | write_lock_irqsave(&card->ctl_files_rwlock, flags); |
119 | list_del(&ctl->list); |
120 | write_unlock_irqrestore(&card->ctl_files_rwlock, flags); |
121 | down_write(&card->controls_rwsem); |
122 | list_for_each_entry(control, &card->controls, list) |
123 | for (idx = 0; idx < control->count; idx++) |
124 | if (control->vd[idx].owner == ctl) |
125 | control->vd[idx].owner = NULL; |
126 | up_write(&card->controls_rwsem); |
127 | snd_ctl_empty_read_queue(ctl); |
128 | put_pid(ctl->pid); |
129 | kfree(ctl); |
130 | module_put(card->module); |
131 | snd_card_file_remove(card, file); |
132 | return 0; |
133 | } |
134 | |
135 | void snd_ctl_notify(struct snd_card *card, unsigned int mask, |
136 | struct snd_ctl_elem_id *id) |
137 | { |
138 | unsigned long flags; |
139 | struct snd_ctl_file *ctl; |
140 | struct snd_kctl_event *ev; |
141 | |
142 | if (snd_BUG_ON(!card || !id)) |
143 | return; |
144 | read_lock(&card->ctl_files_rwlock); |
145 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) |
146 | card->mixer_oss_change_count++; |
147 | #endif |
148 | list_for_each_entry(ctl, &card->ctl_files, list) { |
149 | if (!ctl->subscribed) |
150 | continue; |
151 | spin_lock_irqsave(&ctl->read_lock, flags); |
152 | list_for_each_entry(ev, &ctl->events, list) { |
153 | if (ev->id.numid == id->numid) { |
154 | ev->mask |= mask; |
155 | goto _found; |
156 | } |
157 | } |
158 | ev = kzalloc(sizeof(*ev), GFP_ATOMIC); |
159 | if (ev) { |
160 | ev->id = *id; |
161 | ev->mask = mask; |
162 | list_add_tail(&ev->list, &ctl->events); |
163 | } else { |
164 | snd_printk(KERN_ERR "No memory available to allocate event\n"); |
165 | } |
166 | _found: |
167 | wake_up(&ctl->change_sleep); |
168 | spin_unlock_irqrestore(&ctl->read_lock, flags); |
169 | kill_fasync(&ctl->fasync, SIGIO, POLL_IN); |
170 | } |
171 | read_unlock(&card->ctl_files_rwlock); |
172 | } |
173 | |
174 | EXPORT_SYMBOL(snd_ctl_notify); |
175 | |
176 | /** |
177 | * snd_ctl_new - create a control instance from the template |
178 | * @control: the control template |
179 | * @access: the default control access |
180 | * |
181 | * Allocates a new struct snd_kcontrol instance and copies the given template |
182 | * to the new instance. It does not copy volatile data (access). |
183 | * |
184 | * Returns the pointer of the new instance, or NULL on failure. |
185 | */ |
186 | static struct snd_kcontrol *snd_ctl_new(struct snd_kcontrol *control, |
187 | unsigned int access) |
188 | { |
189 | struct snd_kcontrol *kctl; |
190 | unsigned int idx; |
191 | |
192 | if (snd_BUG_ON(!control || !control->count)) |
193 | return NULL; |
194 | kctl = kzalloc(sizeof(*kctl) + sizeof(struct snd_kcontrol_volatile) * control->count, GFP_KERNEL); |
195 | if (kctl == NULL) { |
196 | snd_printk(KERN_ERR "Cannot allocate control instance\n"); |
197 | return NULL; |
198 | } |
199 | *kctl = *control; |
200 | for (idx = 0; idx < kctl->count; idx++) |
201 | kctl->vd[idx].access = access; |
202 | return kctl; |
203 | } |
204 | |
205 | /** |
206 | * snd_ctl_new1 - create a control instance from the template |
207 | * @ncontrol: the initialization record |
208 | * @private_data: the private data to set |
209 | * |
210 | * Allocates a new struct snd_kcontrol instance and initialize from the given |
211 | * template. When the access field of ncontrol is 0, it's assumed as |
212 | * READWRITE access. When the count field is 0, it's assumes as one. |
213 | * |
214 | * Returns the pointer of the newly generated instance, or NULL on failure. |
215 | */ |
216 | struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new *ncontrol, |
217 | void *private_data) |
218 | { |
219 | struct snd_kcontrol kctl; |
220 | unsigned int access; |
221 | |
222 | if (snd_BUG_ON(!ncontrol || !ncontrol->info)) |
223 | return NULL; |
224 | memset(&kctl, 0, sizeof(kctl)); |
225 | kctl.id.iface = ncontrol->iface; |
226 | kctl.id.device = ncontrol->device; |
227 | kctl.id.subdevice = ncontrol->subdevice; |
228 | if (ncontrol->name) { |
229 | strlcpy(kctl.id.name, ncontrol->name, sizeof(kctl.id.name)); |
230 | if (strcmp(ncontrol->name, kctl.id.name) != 0) |
231 | snd_printk(KERN_WARNING |
232 | "Control name '%s' truncated to '%s'\n", |
233 | ncontrol->name, kctl.id.name); |
234 | } |
235 | kctl.id.index = ncontrol->index; |
236 | kctl.count = ncontrol->count ? ncontrol->count : 1; |
237 | access = ncontrol->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE : |
238 | (ncontrol->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE| |
239 | SNDRV_CTL_ELEM_ACCESS_INACTIVE| |
240 | SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE| |
241 | SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND| |
242 | SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK)); |
243 | kctl.info = ncontrol->info; |
244 | kctl.get = ncontrol->get; |
245 | kctl.put = ncontrol->put; |
246 | kctl.tlv.p = ncontrol->tlv.p; |
247 | kctl.private_value = ncontrol->private_value; |
248 | kctl.private_data = private_data; |
249 | return snd_ctl_new(&kctl, access); |
250 | } |
251 | |
252 | EXPORT_SYMBOL(snd_ctl_new1); |
253 | |
254 | /** |
255 | * snd_ctl_free_one - release the control instance |
256 | * @kcontrol: the control instance |
257 | * |
258 | * Releases the control instance created via snd_ctl_new() |
259 | * or snd_ctl_new1(). |
260 | * Don't call this after the control was added to the card. |
261 | */ |
262 | void snd_ctl_free_one(struct snd_kcontrol *kcontrol) |
263 | { |
264 | if (kcontrol) { |
265 | if (kcontrol->private_free) |
266 | kcontrol->private_free(kcontrol); |
267 | kfree(kcontrol); |
268 | } |
269 | } |
270 | |
271 | EXPORT_SYMBOL(snd_ctl_free_one); |
272 | |
273 | static unsigned int snd_ctl_hole_check(struct snd_card *card, |
274 | unsigned int count) |
275 | { |
276 | struct snd_kcontrol *kctl; |
277 | |
278 | list_for_each_entry(kctl, &card->controls, list) { |
279 | if ((kctl->id.numid <= card->last_numid && |
280 | kctl->id.numid + kctl->count > card->last_numid) || |
281 | (kctl->id.numid <= card->last_numid + count - 1 && |
282 | kctl->id.numid + kctl->count > card->last_numid + count - 1)) |
283 | return card->last_numid = kctl->id.numid + kctl->count - 1; |
284 | } |
285 | return card->last_numid; |
286 | } |
287 | |
288 | static int snd_ctl_find_hole(struct snd_card *card, unsigned int count) |
289 | { |
290 | unsigned int last_numid, iter = 100000; |
291 | |
292 | last_numid = card->last_numid; |
293 | while (last_numid != snd_ctl_hole_check(card, count)) { |
294 | if (--iter == 0) { |
295 | /* this situation is very unlikely */ |
296 | snd_printk(KERN_ERR "unable to allocate new control numid\n"); |
297 | return -ENOMEM; |
298 | } |
299 | last_numid = card->last_numid; |
300 | } |
301 | return 0; |
302 | } |
303 | |
304 | /** |
305 | * snd_ctl_add - add the control instance to the card |
306 | * @card: the card instance |
307 | * @kcontrol: the control instance to add |
308 | * |
309 | * Adds the control instance created via snd_ctl_new() or |
310 | * snd_ctl_new1() to the given card. Assigns also an unique |
311 | * numid used for fast search. |
312 | * |
313 | * Returns zero if successful, or a negative error code on failure. |
314 | * |
315 | * It frees automatically the control which cannot be added. |
316 | */ |
317 | int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol) |
318 | { |
319 | struct snd_ctl_elem_id id; |
320 | unsigned int idx; |
321 | int err = -EINVAL; |
322 | |
323 | if (! kcontrol) |
324 | return err; |
325 | if (snd_BUG_ON(!card || !kcontrol->info)) |
326 | goto error; |
327 | id = kcontrol->id; |
328 | down_write(&card->controls_rwsem); |
329 | if (snd_ctl_find_id(card, &id)) { |
330 | up_write(&card->controls_rwsem); |
331 | snd_printd(KERN_ERR "control %i:%i:%i:%s:%i is already present\n", |
332 | id.iface, |
333 | id.device, |
334 | id.subdevice, |
335 | id.name, |
336 | id.index); |
337 | err = -EBUSY; |
338 | goto error; |
339 | } |
340 | if (snd_ctl_find_hole(card, kcontrol->count) < 0) { |
341 | up_write(&card->controls_rwsem); |
342 | err = -ENOMEM; |
343 | goto error; |
344 | } |
345 | list_add_tail(&kcontrol->list, &card->controls); |
346 | card->controls_count += kcontrol->count; |
347 | kcontrol->id.numid = card->last_numid + 1; |
348 | card->last_numid += kcontrol->count; |
349 | up_write(&card->controls_rwsem); |
350 | for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++) |
351 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id); |
352 | return 0; |
353 | |
354 | error: |
355 | snd_ctl_free_one(kcontrol); |
356 | return err; |
357 | } |
358 | |
359 | EXPORT_SYMBOL(snd_ctl_add); |
360 | |
361 | /** |
362 | * snd_ctl_remove - remove the control from the card and release it |
363 | * @card: the card instance |
364 | * @kcontrol: the control instance to remove |
365 | * |
366 | * Removes the control from the card and then releases the instance. |
367 | * You don't need to call snd_ctl_free_one(). You must be in |
368 | * the write lock - down_write(&card->controls_rwsem). |
369 | * |
370 | * Returns 0 if successful, or a negative error code on failure. |
371 | */ |
372 | int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol) |
373 | { |
374 | struct snd_ctl_elem_id id; |
375 | unsigned int idx; |
376 | |
377 | if (snd_BUG_ON(!card || !kcontrol)) |
378 | return -EINVAL; |
379 | list_del(&kcontrol->list); |
380 | card->controls_count -= kcontrol->count; |
381 | id = kcontrol->id; |
382 | for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++) |
383 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_REMOVE, &id); |
384 | snd_ctl_free_one(kcontrol); |
385 | return 0; |
386 | } |
387 | |
388 | EXPORT_SYMBOL(snd_ctl_remove); |
389 | |
390 | /** |
391 | * snd_ctl_remove_id - remove the control of the given id and release it |
392 | * @card: the card instance |
393 | * @id: the control id to remove |
394 | * |
395 | * Finds the control instance with the given id, removes it from the |
396 | * card list and releases it. |
397 | * |
398 | * Returns 0 if successful, or a negative error code on failure. |
399 | */ |
400 | int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id) |
401 | { |
402 | struct snd_kcontrol *kctl; |
403 | int ret; |
404 | |
405 | down_write(&card->controls_rwsem); |
406 | kctl = snd_ctl_find_id(card, id); |
407 | if (kctl == NULL) { |
408 | up_write(&card->controls_rwsem); |
409 | return -ENOENT; |
410 | } |
411 | ret = snd_ctl_remove(card, kctl); |
412 | up_write(&card->controls_rwsem); |
413 | return ret; |
414 | } |
415 | |
416 | EXPORT_SYMBOL(snd_ctl_remove_id); |
417 | |
418 | /** |
419 | * snd_ctl_remove_user_ctl - remove and release the unlocked user control |
420 | * @file: active control handle |
421 | * @id: the control id to remove |
422 | * |
423 | * Finds the control instance with the given id, removes it from the |
424 | * card list and releases it. |
425 | * |
426 | * Returns 0 if successful, or a negative error code on failure. |
427 | */ |
428 | static int snd_ctl_remove_user_ctl(struct snd_ctl_file * file, |
429 | struct snd_ctl_elem_id *id) |
430 | { |
431 | struct snd_card *card = file->card; |
432 | struct snd_kcontrol *kctl; |
433 | int idx, ret; |
434 | |
435 | down_write(&card->controls_rwsem); |
436 | kctl = snd_ctl_find_id(card, id); |
437 | if (kctl == NULL) { |
438 | ret = -ENOENT; |
439 | goto error; |
440 | } |
441 | if (!(kctl->vd[0].access & SNDRV_CTL_ELEM_ACCESS_USER)) { |
442 | ret = -EINVAL; |
443 | goto error; |
444 | } |
445 | for (idx = 0; idx < kctl->count; idx++) |
446 | if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) { |
447 | ret = -EBUSY; |
448 | goto error; |
449 | } |
450 | ret = snd_ctl_remove(card, kctl); |
451 | if (ret < 0) |
452 | goto error; |
453 | card->user_ctl_count--; |
454 | error: |
455 | up_write(&card->controls_rwsem); |
456 | return ret; |
457 | } |
458 | |
459 | /** |
460 | * snd_ctl_rename_id - replace the id of a control on the card |
461 | * @card: the card instance |
462 | * @src_id: the old id |
463 | * @dst_id: the new id |
464 | * |
465 | * Finds the control with the old id from the card, and replaces the |
466 | * id with the new one. |
467 | * |
468 | * Returns zero if successful, or a negative error code on failure. |
469 | */ |
470 | int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id, |
471 | struct snd_ctl_elem_id *dst_id) |
472 | { |
473 | struct snd_kcontrol *kctl; |
474 | |
475 | down_write(&card->controls_rwsem); |
476 | kctl = snd_ctl_find_id(card, src_id); |
477 | if (kctl == NULL) { |
478 | up_write(&card->controls_rwsem); |
479 | return -ENOENT; |
480 | } |
481 | kctl->id = *dst_id; |
482 | kctl->id.numid = card->last_numid + 1; |
483 | card->last_numid += kctl->count; |
484 | up_write(&card->controls_rwsem); |
485 | return 0; |
486 | } |
487 | |
488 | EXPORT_SYMBOL(snd_ctl_rename_id); |
489 | |
490 | /** |
491 | * snd_ctl_find_numid - find the control instance with the given number-id |
492 | * @card: the card instance |
493 | * @numid: the number-id to search |
494 | * |
495 | * Finds the control instance with the given number-id from the card. |
496 | * |
497 | * Returns the pointer of the instance if found, or NULL if not. |
498 | * |
499 | * The caller must down card->controls_rwsem before calling this function |
500 | * (if the race condition can happen). |
501 | */ |
502 | struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid) |
503 | { |
504 | struct snd_kcontrol *kctl; |
505 | |
506 | if (snd_BUG_ON(!card || !numid)) |
507 | return NULL; |
508 | list_for_each_entry(kctl, &card->controls, list) { |
509 | if (kctl->id.numid <= numid && kctl->id.numid + kctl->count > numid) |
510 | return kctl; |
511 | } |
512 | return NULL; |
513 | } |
514 | |
515 | EXPORT_SYMBOL(snd_ctl_find_numid); |
516 | |
517 | /** |
518 | * snd_ctl_find_id - find the control instance with the given id |
519 | * @card: the card instance |
520 | * @id: the id to search |
521 | * |
522 | * Finds the control instance with the given id from the card. |
523 | * |
524 | * Returns the pointer of the instance if found, or NULL if not. |
525 | * |
526 | * The caller must down card->controls_rwsem before calling this function |
527 | * (if the race condition can happen). |
528 | */ |
529 | struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card, |
530 | struct snd_ctl_elem_id *id) |
531 | { |
532 | struct snd_kcontrol *kctl; |
533 | |
534 | if (snd_BUG_ON(!card || !id)) |
535 | return NULL; |
536 | if (id->numid != 0) |
537 | return snd_ctl_find_numid(card, id->numid); |
538 | list_for_each_entry(kctl, &card->controls, list) { |
539 | if (kctl->id.iface != id->iface) |
540 | continue; |
541 | if (kctl->id.device != id->device) |
542 | continue; |
543 | if (kctl->id.subdevice != id->subdevice) |
544 | continue; |
545 | if (strncmp(kctl->id.name, id->name, sizeof(kctl->id.name))) |
546 | continue; |
547 | if (kctl->id.index > id->index) |
548 | continue; |
549 | if (kctl->id.index + kctl->count <= id->index) |
550 | continue; |
551 | return kctl; |
552 | } |
553 | return NULL; |
554 | } |
555 | |
556 | EXPORT_SYMBOL(snd_ctl_find_id); |
557 | |
558 | static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl, |
559 | unsigned int cmd, void __user *arg) |
560 | { |
561 | struct snd_ctl_card_info *info; |
562 | |
563 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
564 | if (! info) |
565 | return -ENOMEM; |
566 | down_read(&snd_ioctl_rwsem); |
567 | info->card = card->number; |
568 | strlcpy(info->id, card->id, sizeof(info->id)); |
569 | strlcpy(info->driver, card->driver, sizeof(info->driver)); |
570 | strlcpy(info->name, card->shortname, sizeof(info->name)); |
571 | strlcpy(info->longname, card->longname, sizeof(info->longname)); |
572 | strlcpy(info->mixername, card->mixername, sizeof(info->mixername)); |
573 | strlcpy(info->components, card->components, sizeof(info->components)); |
574 | up_read(&snd_ioctl_rwsem); |
575 | if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info))) { |
576 | kfree(info); |
577 | return -EFAULT; |
578 | } |
579 | kfree(info); |
580 | return 0; |
581 | } |
582 | |
583 | static int snd_ctl_elem_list(struct snd_card *card, |
584 | struct snd_ctl_elem_list __user *_list) |
585 | { |
586 | struct list_head *plist; |
587 | struct snd_ctl_elem_list list; |
588 | struct snd_kcontrol *kctl; |
589 | struct snd_ctl_elem_id *dst, *id; |
590 | unsigned int offset, space, first, jidx; |
591 | |
592 | if (copy_from_user(&list, _list, sizeof(list))) |
593 | return -EFAULT; |
594 | offset = list.offset; |
595 | space = list.space; |
596 | first = 0; |
597 | /* try limit maximum space */ |
598 | if (space > 16384) |
599 | return -ENOMEM; |
600 | if (space > 0) { |
601 | /* allocate temporary buffer for atomic operation */ |
602 | dst = vmalloc(space * sizeof(struct snd_ctl_elem_id)); |
603 | if (dst == NULL) |
604 | return -ENOMEM; |
605 | down_read(&card->controls_rwsem); |
606 | list.count = card->controls_count; |
607 | plist = card->controls.next; |
608 | while (plist != &card->controls) { |
609 | if (offset == 0) |
610 | break; |
611 | kctl = snd_kcontrol(plist); |
612 | if (offset < kctl->count) |
613 | break; |
614 | offset -= kctl->count; |
615 | plist = plist->next; |
616 | } |
617 | list.used = 0; |
618 | id = dst; |
619 | while (space > 0 && plist != &card->controls) { |
620 | kctl = snd_kcontrol(plist); |
621 | for (jidx = offset; space > 0 && jidx < kctl->count; jidx++) { |
622 | snd_ctl_build_ioff(id, kctl, jidx); |
623 | id++; |
624 | space--; |
625 | list.used++; |
626 | } |
627 | plist = plist->next; |
628 | offset = 0; |
629 | } |
630 | up_read(&card->controls_rwsem); |
631 | if (list.used > 0 && |
632 | copy_to_user(list.pids, dst, |
633 | list.used * sizeof(struct snd_ctl_elem_id))) { |
634 | vfree(dst); |
635 | return -EFAULT; |
636 | } |
637 | vfree(dst); |
638 | } else { |
639 | down_read(&card->controls_rwsem); |
640 | list.count = card->controls_count; |
641 | up_read(&card->controls_rwsem); |
642 | } |
643 | if (copy_to_user(_list, &list, sizeof(list))) |
644 | return -EFAULT; |
645 | return 0; |
646 | } |
647 | |
648 | static int snd_ctl_elem_info(struct snd_ctl_file *ctl, |
649 | struct snd_ctl_elem_info *info) |
650 | { |
651 | struct snd_card *card = ctl->card; |
652 | struct snd_kcontrol *kctl; |
653 | struct snd_kcontrol_volatile *vd; |
654 | unsigned int index_offset; |
655 | int result; |
656 | |
657 | down_read(&card->controls_rwsem); |
658 | kctl = snd_ctl_find_id(card, &info->id); |
659 | if (kctl == NULL) { |
660 | up_read(&card->controls_rwsem); |
661 | return -ENOENT; |
662 | } |
663 | #ifdef CONFIG_SND_DEBUG |
664 | info->access = 0; |
665 | #endif |
666 | result = kctl->info(kctl, info); |
667 | if (result >= 0) { |
668 | snd_BUG_ON(info->access); |
669 | index_offset = snd_ctl_get_ioff(kctl, &info->id); |
670 | vd = &kctl->vd[index_offset]; |
671 | snd_ctl_build_ioff(&info->id, kctl, index_offset); |
672 | info->access = vd->access; |
673 | if (vd->owner) { |
674 | info->access |= SNDRV_CTL_ELEM_ACCESS_LOCK; |
675 | if (vd->owner == ctl) |
676 | info->access |= SNDRV_CTL_ELEM_ACCESS_OWNER; |
677 | info->owner = pid_vnr(vd->owner->pid); |
678 | } else { |
679 | info->owner = -1; |
680 | } |
681 | } |
682 | up_read(&card->controls_rwsem); |
683 | return result; |
684 | } |
685 | |
686 | static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl, |
687 | struct snd_ctl_elem_info __user *_info) |
688 | { |
689 | struct snd_ctl_elem_info info; |
690 | int result; |
691 | |
692 | if (copy_from_user(&info, _info, sizeof(info))) |
693 | return -EFAULT; |
694 | snd_power_lock(ctl->card); |
695 | result = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0); |
696 | if (result >= 0) |
697 | result = snd_ctl_elem_info(ctl, &info); |
698 | snd_power_unlock(ctl->card); |
699 | if (result >= 0) |
700 | if (copy_to_user(_info, &info, sizeof(info))) |
701 | return -EFAULT; |
702 | return result; |
703 | } |
704 | |
705 | static int snd_ctl_elem_read(struct snd_card *card, |
706 | struct snd_ctl_elem_value *control) |
707 | { |
708 | struct snd_kcontrol *kctl; |
709 | struct snd_kcontrol_volatile *vd; |
710 | unsigned int index_offset; |
711 | int result; |
712 | |
713 | down_read(&card->controls_rwsem); |
714 | kctl = snd_ctl_find_id(card, &control->id); |
715 | if (kctl == NULL) { |
716 | result = -ENOENT; |
717 | } else { |
718 | index_offset = snd_ctl_get_ioff(kctl, &control->id); |
719 | vd = &kctl->vd[index_offset]; |
720 | if ((vd->access & SNDRV_CTL_ELEM_ACCESS_READ) && |
721 | kctl->get != NULL) { |
722 | snd_ctl_build_ioff(&control->id, kctl, index_offset); |
723 | result = kctl->get(kctl, control); |
724 | } else |
725 | result = -EPERM; |
726 | } |
727 | up_read(&card->controls_rwsem); |
728 | return result; |
729 | } |
730 | |
731 | static int snd_ctl_elem_read_user(struct snd_card *card, |
732 | struct snd_ctl_elem_value __user *_control) |
733 | { |
734 | struct snd_ctl_elem_value *control; |
735 | int result; |
736 | |
737 | control = memdup_user(_control, sizeof(*control)); |
738 | if (IS_ERR(control)) |
739 | return PTR_ERR(control); |
740 | |
741 | snd_power_lock(card); |
742 | result = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
743 | if (result >= 0) |
744 | result = snd_ctl_elem_read(card, control); |
745 | snd_power_unlock(card); |
746 | if (result >= 0) |
747 | if (copy_to_user(_control, control, sizeof(*control))) |
748 | result = -EFAULT; |
749 | kfree(control); |
750 | return result; |
751 | } |
752 | |
753 | static int snd_ctl_elem_write(struct snd_card *card, struct snd_ctl_file *file, |
754 | struct snd_ctl_elem_value *control) |
755 | { |
756 | struct snd_kcontrol *kctl; |
757 | struct snd_kcontrol_volatile *vd; |
758 | unsigned int index_offset; |
759 | int result; |
760 | |
761 | down_read(&card->controls_rwsem); |
762 | kctl = snd_ctl_find_id(card, &control->id); |
763 | if (kctl == NULL) { |
764 | result = -ENOENT; |
765 | } else { |
766 | index_offset = snd_ctl_get_ioff(kctl, &control->id); |
767 | vd = &kctl->vd[index_offset]; |
768 | if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_WRITE) || |
769 | kctl->put == NULL || |
770 | (file && vd->owner && vd->owner != file)) { |
771 | result = -EPERM; |
772 | } else { |
773 | snd_ctl_build_ioff(&control->id, kctl, index_offset); |
774 | result = kctl->put(kctl, control); |
775 | } |
776 | if (result > 0) { |
777 | up_read(&card->controls_rwsem); |
778 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, |
779 | &control->id); |
780 | return 0; |
781 | } |
782 | } |
783 | up_read(&card->controls_rwsem); |
784 | return result; |
785 | } |
786 | |
787 | static int snd_ctl_elem_write_user(struct snd_ctl_file *file, |
788 | struct snd_ctl_elem_value __user *_control) |
789 | { |
790 | struct snd_ctl_elem_value *control; |
791 | struct snd_card *card; |
792 | int result; |
793 | |
794 | control = memdup_user(_control, sizeof(*control)); |
795 | if (IS_ERR(control)) |
796 | return PTR_ERR(control); |
797 | |
798 | card = file->card; |
799 | snd_power_lock(card); |
800 | result = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
801 | if (result >= 0) |
802 | result = snd_ctl_elem_write(card, file, control); |
803 | snd_power_unlock(card); |
804 | if (result >= 0) |
805 | if (copy_to_user(_control, control, sizeof(*control))) |
806 | result = -EFAULT; |
807 | kfree(control); |
808 | return result; |
809 | } |
810 | |
811 | static int snd_ctl_elem_lock(struct snd_ctl_file *file, |
812 | struct snd_ctl_elem_id __user *_id) |
813 | { |
814 | struct snd_card *card = file->card; |
815 | struct snd_ctl_elem_id id; |
816 | struct snd_kcontrol *kctl; |
817 | struct snd_kcontrol_volatile *vd; |
818 | int result; |
819 | |
820 | if (copy_from_user(&id, _id, sizeof(id))) |
821 | return -EFAULT; |
822 | down_write(&card->controls_rwsem); |
823 | kctl = snd_ctl_find_id(card, &id); |
824 | if (kctl == NULL) { |
825 | result = -ENOENT; |
826 | } else { |
827 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; |
828 | if (vd->owner != NULL) |
829 | result = -EBUSY; |
830 | else { |
831 | vd->owner = file; |
832 | result = 0; |
833 | } |
834 | } |
835 | up_write(&card->controls_rwsem); |
836 | return result; |
837 | } |
838 | |
839 | static int snd_ctl_elem_unlock(struct snd_ctl_file *file, |
840 | struct snd_ctl_elem_id __user *_id) |
841 | { |
842 | struct snd_card *card = file->card; |
843 | struct snd_ctl_elem_id id; |
844 | struct snd_kcontrol *kctl; |
845 | struct snd_kcontrol_volatile *vd; |
846 | int result; |
847 | |
848 | if (copy_from_user(&id, _id, sizeof(id))) |
849 | return -EFAULT; |
850 | down_write(&card->controls_rwsem); |
851 | kctl = snd_ctl_find_id(card, &id); |
852 | if (kctl == NULL) { |
853 | result = -ENOENT; |
854 | } else { |
855 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; |
856 | if (vd->owner == NULL) |
857 | result = -EINVAL; |
858 | else if (vd->owner != file) |
859 | result = -EPERM; |
860 | else { |
861 | vd->owner = NULL; |
862 | result = 0; |
863 | } |
864 | } |
865 | up_write(&card->controls_rwsem); |
866 | return result; |
867 | } |
868 | |
869 | struct user_element { |
870 | struct snd_ctl_elem_info info; |
871 | void *elem_data; /* element data */ |
872 | unsigned long elem_data_size; /* size of element data in bytes */ |
873 | void *tlv_data; /* TLV data */ |
874 | unsigned long tlv_data_size; /* TLV data size */ |
875 | void *priv_data; /* private data (like strings for enumerated type) */ |
876 | unsigned long priv_data_size; /* size of private data in bytes */ |
877 | }; |
878 | |
879 | static int snd_ctl_elem_user_info(struct snd_kcontrol *kcontrol, |
880 | struct snd_ctl_elem_info *uinfo) |
881 | { |
882 | struct user_element *ue = kcontrol->private_data; |
883 | |
884 | *uinfo = ue->info; |
885 | return 0; |
886 | } |
887 | |
888 | static int snd_ctl_elem_user_get(struct snd_kcontrol *kcontrol, |
889 | struct snd_ctl_elem_value *ucontrol) |
890 | { |
891 | struct user_element *ue = kcontrol->private_data; |
892 | |
893 | memcpy(&ucontrol->value, ue->elem_data, ue->elem_data_size); |
894 | return 0; |
895 | } |
896 | |
897 | static int snd_ctl_elem_user_put(struct snd_kcontrol *kcontrol, |
898 | struct snd_ctl_elem_value *ucontrol) |
899 | { |
900 | int change; |
901 | struct user_element *ue = kcontrol->private_data; |
902 | |
903 | change = memcmp(&ucontrol->value, ue->elem_data, ue->elem_data_size) != 0; |
904 | if (change) |
905 | memcpy(ue->elem_data, &ucontrol->value, ue->elem_data_size); |
906 | return change; |
907 | } |
908 | |
909 | static int snd_ctl_elem_user_tlv(struct snd_kcontrol *kcontrol, |
910 | int op_flag, |
911 | unsigned int size, |
912 | unsigned int __user *tlv) |
913 | { |
914 | struct user_element *ue = kcontrol->private_data; |
915 | int change = 0; |
916 | void *new_data; |
917 | |
918 | if (op_flag > 0) { |
919 | if (size > 1024 * 128) /* sane value */ |
920 | return -EINVAL; |
921 | |
922 | new_data = memdup_user(tlv, size); |
923 | if (IS_ERR(new_data)) |
924 | return PTR_ERR(new_data); |
925 | change = ue->tlv_data_size != size; |
926 | if (!change) |
927 | change = memcmp(ue->tlv_data, new_data, size); |
928 | kfree(ue->tlv_data); |
929 | ue->tlv_data = new_data; |
930 | ue->tlv_data_size = size; |
931 | } else { |
932 | if (! ue->tlv_data_size || ! ue->tlv_data) |
933 | return -ENXIO; |
934 | if (size < ue->tlv_data_size) |
935 | return -ENOSPC; |
936 | if (copy_to_user(tlv, ue->tlv_data, ue->tlv_data_size)) |
937 | return -EFAULT; |
938 | } |
939 | return change; |
940 | } |
941 | |
942 | static void snd_ctl_elem_user_free(struct snd_kcontrol *kcontrol) |
943 | { |
944 | struct user_element *ue = kcontrol->private_data; |
945 | if (ue->tlv_data) |
946 | kfree(ue->tlv_data); |
947 | kfree(ue); |
948 | } |
949 | |
950 | static int snd_ctl_elem_add(struct snd_ctl_file *file, |
951 | struct snd_ctl_elem_info *info, int replace) |
952 | { |
953 | struct snd_card *card = file->card; |
954 | struct snd_kcontrol kctl, *_kctl; |
955 | unsigned int access; |
956 | long private_size; |
957 | struct user_element *ue; |
958 | int idx, err; |
959 | |
960 | if (card->user_ctl_count >= MAX_USER_CONTROLS) |
961 | return -ENOMEM; |
962 | if (info->count < 1) |
963 | return -EINVAL; |
964 | access = info->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE : |
965 | (info->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE| |
966 | SNDRV_CTL_ELEM_ACCESS_INACTIVE| |
967 | SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE)); |
968 | info->id.numid = 0; |
969 | memset(&kctl, 0, sizeof(kctl)); |
970 | down_write(&card->controls_rwsem); |
971 | _kctl = snd_ctl_find_id(card, &info->id); |
972 | err = 0; |
973 | if (_kctl) { |
974 | if (replace) |
975 | err = snd_ctl_remove(card, _kctl); |
976 | else |
977 | err = -EBUSY; |
978 | } else { |
979 | if (replace) |
980 | err = -ENOENT; |
981 | } |
982 | up_write(&card->controls_rwsem); |
983 | if (err < 0) |
984 | return err; |
985 | memcpy(&kctl.id, &info->id, sizeof(info->id)); |
986 | kctl.count = info->owner ? info->owner : 1; |
987 | access |= SNDRV_CTL_ELEM_ACCESS_USER; |
988 | kctl.info = snd_ctl_elem_user_info; |
989 | if (access & SNDRV_CTL_ELEM_ACCESS_READ) |
990 | kctl.get = snd_ctl_elem_user_get; |
991 | if (access & SNDRV_CTL_ELEM_ACCESS_WRITE) |
992 | kctl.put = snd_ctl_elem_user_put; |
993 | if (access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE) { |
994 | kctl.tlv.c = snd_ctl_elem_user_tlv; |
995 | access |= SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK; |
996 | } |
997 | switch (info->type) { |
998 | case SNDRV_CTL_ELEM_TYPE_BOOLEAN: |
999 | case SNDRV_CTL_ELEM_TYPE_INTEGER: |
1000 | private_size = sizeof(long); |
1001 | if (info->count > 128) |
1002 | return -EINVAL; |
1003 | break; |
1004 | case SNDRV_CTL_ELEM_TYPE_INTEGER64: |
1005 | private_size = sizeof(long long); |
1006 | if (info->count > 64) |
1007 | return -EINVAL; |
1008 | break; |
1009 | case SNDRV_CTL_ELEM_TYPE_BYTES: |
1010 | private_size = sizeof(unsigned char); |
1011 | if (info->count > 512) |
1012 | return -EINVAL; |
1013 | break; |
1014 | case SNDRV_CTL_ELEM_TYPE_IEC958: |
1015 | private_size = sizeof(struct snd_aes_iec958); |
1016 | if (info->count != 1) |
1017 | return -EINVAL; |
1018 | break; |
1019 | default: |
1020 | return -EINVAL; |
1021 | } |
1022 | private_size *= info->count; |
1023 | ue = kzalloc(sizeof(struct user_element) + private_size, GFP_KERNEL); |
1024 | if (ue == NULL) |
1025 | return -ENOMEM; |
1026 | ue->info = *info; |
1027 | ue->info.access = 0; |
1028 | ue->elem_data = (char *)ue + sizeof(*ue); |
1029 | ue->elem_data_size = private_size; |
1030 | kctl.private_free = snd_ctl_elem_user_free; |
1031 | _kctl = snd_ctl_new(&kctl, access); |
1032 | if (_kctl == NULL) { |
1033 | kfree(ue); |
1034 | return -ENOMEM; |
1035 | } |
1036 | _kctl->private_data = ue; |
1037 | for (idx = 0; idx < _kctl->count; idx++) |
1038 | _kctl->vd[idx].owner = file; |
1039 | err = snd_ctl_add(card, _kctl); |
1040 | if (err < 0) |
1041 | return err; |
1042 | |
1043 | down_write(&card->controls_rwsem); |
1044 | card->user_ctl_count++; |
1045 | up_write(&card->controls_rwsem); |
1046 | |
1047 | return 0; |
1048 | } |
1049 | |
1050 | static int snd_ctl_elem_add_user(struct snd_ctl_file *file, |
1051 | struct snd_ctl_elem_info __user *_info, int replace) |
1052 | { |
1053 | struct snd_ctl_elem_info info; |
1054 | if (copy_from_user(&info, _info, sizeof(info))) |
1055 | return -EFAULT; |
1056 | return snd_ctl_elem_add(file, &info, replace); |
1057 | } |
1058 | |
1059 | static int snd_ctl_elem_remove(struct snd_ctl_file *file, |
1060 | struct snd_ctl_elem_id __user *_id) |
1061 | { |
1062 | struct snd_ctl_elem_id id; |
1063 | |
1064 | if (copy_from_user(&id, _id, sizeof(id))) |
1065 | return -EFAULT; |
1066 | return snd_ctl_remove_user_ctl(file, &id); |
1067 | } |
1068 | |
1069 | static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr) |
1070 | { |
1071 | int subscribe; |
1072 | if (get_user(subscribe, ptr)) |
1073 | return -EFAULT; |
1074 | if (subscribe < 0) { |
1075 | subscribe = file->subscribed; |
1076 | if (put_user(subscribe, ptr)) |
1077 | return -EFAULT; |
1078 | return 0; |
1079 | } |
1080 | if (subscribe) { |
1081 | file->subscribed = 1; |
1082 | return 0; |
1083 | } else if (file->subscribed) { |
1084 | snd_ctl_empty_read_queue(file); |
1085 | file->subscribed = 0; |
1086 | } |
1087 | return 0; |
1088 | } |
1089 | |
1090 | static int snd_ctl_tlv_ioctl(struct snd_ctl_file *file, |
1091 | struct snd_ctl_tlv __user *_tlv, |
1092 | int op_flag) |
1093 | { |
1094 | struct snd_card *card = file->card; |
1095 | struct snd_ctl_tlv tlv; |
1096 | struct snd_kcontrol *kctl; |
1097 | struct snd_kcontrol_volatile *vd; |
1098 | unsigned int len; |
1099 | int err = 0; |
1100 | |
1101 | if (copy_from_user(&tlv, _tlv, sizeof(tlv))) |
1102 | return -EFAULT; |
1103 | if (tlv.length < sizeof(unsigned int) * 2) |
1104 | return -EINVAL; |
1105 | down_read(&card->controls_rwsem); |
1106 | kctl = snd_ctl_find_numid(card, tlv.numid); |
1107 | if (kctl == NULL) { |
1108 | err = -ENOENT; |
1109 | goto __kctl_end; |
1110 | } |
1111 | if (kctl->tlv.p == NULL) { |
1112 | err = -ENXIO; |
1113 | goto __kctl_end; |
1114 | } |
1115 | vd = &kctl->vd[tlv.numid - kctl->id.numid]; |
1116 | if ((op_flag == 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_READ) == 0) || |
1117 | (op_flag > 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE) == 0) || |
1118 | (op_flag < 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND) == 0)) { |
1119 | err = -ENXIO; |
1120 | goto __kctl_end; |
1121 | } |
1122 | if (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) { |
1123 | if (vd->owner != NULL && vd->owner != file) { |
1124 | err = -EPERM; |
1125 | goto __kctl_end; |
1126 | } |
1127 | err = kctl->tlv.c(kctl, op_flag, tlv.length, _tlv->tlv); |
1128 | if (err > 0) { |
1129 | up_read(&card->controls_rwsem); |
1130 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_TLV, &kctl->id); |
1131 | return 0; |
1132 | } |
1133 | } else { |
1134 | if (op_flag) { |
1135 | err = -ENXIO; |
1136 | goto __kctl_end; |
1137 | } |
1138 | len = kctl->tlv.p[1] + 2 * sizeof(unsigned int); |
1139 | if (tlv.length < len) { |
1140 | err = -ENOMEM; |
1141 | goto __kctl_end; |
1142 | } |
1143 | if (copy_to_user(_tlv->tlv, kctl->tlv.p, len)) |
1144 | err = -EFAULT; |
1145 | } |
1146 | __kctl_end: |
1147 | up_read(&card->controls_rwsem); |
1148 | return err; |
1149 | } |
1150 | |
1151 | static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1152 | { |
1153 | struct snd_ctl_file *ctl; |
1154 | struct snd_card *card; |
1155 | struct snd_kctl_ioctl *p; |
1156 | void __user *argp = (void __user *)arg; |
1157 | int __user *ip = argp; |
1158 | int err; |
1159 | |
1160 | ctl = file->private_data; |
1161 | card = ctl->card; |
1162 | if (snd_BUG_ON(!card)) |
1163 | return -ENXIO; |
1164 | switch (cmd) { |
1165 | case SNDRV_CTL_IOCTL_PVERSION: |
1166 | return put_user(SNDRV_CTL_VERSION, ip) ? -EFAULT : 0; |
1167 | case SNDRV_CTL_IOCTL_CARD_INFO: |
1168 | return snd_ctl_card_info(card, ctl, cmd, argp); |
1169 | case SNDRV_CTL_IOCTL_ELEM_LIST: |
1170 | return snd_ctl_elem_list(card, argp); |
1171 | case SNDRV_CTL_IOCTL_ELEM_INFO: |
1172 | return snd_ctl_elem_info_user(ctl, argp); |
1173 | case SNDRV_CTL_IOCTL_ELEM_READ: |
1174 | return snd_ctl_elem_read_user(card, argp); |
1175 | case SNDRV_CTL_IOCTL_ELEM_WRITE: |
1176 | return snd_ctl_elem_write_user(ctl, argp); |
1177 | case SNDRV_CTL_IOCTL_ELEM_LOCK: |
1178 | return snd_ctl_elem_lock(ctl, argp); |
1179 | case SNDRV_CTL_IOCTL_ELEM_UNLOCK: |
1180 | return snd_ctl_elem_unlock(ctl, argp); |
1181 | case SNDRV_CTL_IOCTL_ELEM_ADD: |
1182 | return snd_ctl_elem_add_user(ctl, argp, 0); |
1183 | case SNDRV_CTL_IOCTL_ELEM_REPLACE: |
1184 | return snd_ctl_elem_add_user(ctl, argp, 1); |
1185 | case SNDRV_CTL_IOCTL_ELEM_REMOVE: |
1186 | return snd_ctl_elem_remove(ctl, argp); |
1187 | case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS: |
1188 | return snd_ctl_subscribe_events(ctl, ip); |
1189 | case SNDRV_CTL_IOCTL_TLV_READ: |
1190 | return snd_ctl_tlv_ioctl(ctl, argp, 0); |
1191 | case SNDRV_CTL_IOCTL_TLV_WRITE: |
1192 | return snd_ctl_tlv_ioctl(ctl, argp, 1); |
1193 | case SNDRV_CTL_IOCTL_TLV_COMMAND: |
1194 | return snd_ctl_tlv_ioctl(ctl, argp, -1); |
1195 | case SNDRV_CTL_IOCTL_POWER: |
1196 | return -ENOPROTOOPT; |
1197 | case SNDRV_CTL_IOCTL_POWER_STATE: |
1198 | #ifdef CONFIG_PM |
1199 | return put_user(card->power_state, ip) ? -EFAULT : 0; |
1200 | #else |
1201 | return put_user(SNDRV_CTL_POWER_D0, ip) ? -EFAULT : 0; |
1202 | #endif |
1203 | } |
1204 | down_read(&snd_ioctl_rwsem); |
1205 | list_for_each_entry(p, &snd_control_ioctls, list) { |
1206 | err = p->fioctl(card, ctl, cmd, arg); |
1207 | if (err != -ENOIOCTLCMD) { |
1208 | up_read(&snd_ioctl_rwsem); |
1209 | return err; |
1210 | } |
1211 | } |
1212 | up_read(&snd_ioctl_rwsem); |
1213 | snd_printdd("unknown ioctl = 0x%x\n", cmd); |
1214 | return -ENOTTY; |
1215 | } |
1216 | |
1217 | static ssize_t snd_ctl_read(struct file *file, char __user *buffer, |
1218 | size_t count, loff_t * offset) |
1219 | { |
1220 | struct snd_ctl_file *ctl; |
1221 | int err = 0; |
1222 | ssize_t result = 0; |
1223 | |
1224 | ctl = file->private_data; |
1225 | if (snd_BUG_ON(!ctl || !ctl->card)) |
1226 | return -ENXIO; |
1227 | if (!ctl->subscribed) |
1228 | return -EBADFD; |
1229 | if (count < sizeof(struct snd_ctl_event)) |
1230 | return -EINVAL; |
1231 | spin_lock_irq(&ctl->read_lock); |
1232 | while (count >= sizeof(struct snd_ctl_event)) { |
1233 | struct snd_ctl_event ev; |
1234 | struct snd_kctl_event *kev; |
1235 | while (list_empty(&ctl->events)) { |
1236 | wait_queue_t wait; |
1237 | if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { |
1238 | err = -EAGAIN; |
1239 | goto __end_lock; |
1240 | } |
1241 | init_waitqueue_entry(&wait, current); |
1242 | add_wait_queue(&ctl->change_sleep, &wait); |
1243 | set_current_state(TASK_INTERRUPTIBLE); |
1244 | spin_unlock_irq(&ctl->read_lock); |
1245 | schedule(); |
1246 | remove_wait_queue(&ctl->change_sleep, &wait); |
1247 | if (signal_pending(current)) |
1248 | return -ERESTARTSYS; |
1249 | spin_lock_irq(&ctl->read_lock); |
1250 | } |
1251 | kev = snd_kctl_event(ctl->events.next); |
1252 | ev.type = SNDRV_CTL_EVENT_ELEM; |
1253 | ev.data.elem.mask = kev->mask; |
1254 | ev.data.elem.id = kev->id; |
1255 | list_del(&kev->list); |
1256 | spin_unlock_irq(&ctl->read_lock); |
1257 | kfree(kev); |
1258 | if (copy_to_user(buffer, &ev, sizeof(struct snd_ctl_event))) { |
1259 | err = -EFAULT; |
1260 | goto __end; |
1261 | } |
1262 | spin_lock_irq(&ctl->read_lock); |
1263 | buffer += sizeof(struct snd_ctl_event); |
1264 | count -= sizeof(struct snd_ctl_event); |
1265 | result += sizeof(struct snd_ctl_event); |
1266 | } |
1267 | __end_lock: |
1268 | spin_unlock_irq(&ctl->read_lock); |
1269 | __end: |
1270 | return result > 0 ? result : err; |
1271 | } |
1272 | |
1273 | static unsigned int snd_ctl_poll(struct file *file, poll_table * wait) |
1274 | { |
1275 | unsigned int mask; |
1276 | struct snd_ctl_file *ctl; |
1277 | |
1278 | ctl = file->private_data; |
1279 | if (!ctl->subscribed) |
1280 | return 0; |
1281 | poll_wait(file, &ctl->change_sleep, wait); |
1282 | |
1283 | mask = 0; |
1284 | if (!list_empty(&ctl->events)) |
1285 | mask |= POLLIN | POLLRDNORM; |
1286 | |
1287 | return mask; |
1288 | } |
1289 | |
1290 | /* |
1291 | * register the device-specific control-ioctls. |
1292 | * called from each device manager like pcm.c, hwdep.c, etc. |
1293 | */ |
1294 | static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists) |
1295 | { |
1296 | struct snd_kctl_ioctl *pn; |
1297 | |
1298 | pn = kzalloc(sizeof(struct snd_kctl_ioctl), GFP_KERNEL); |
1299 | if (pn == NULL) |
1300 | return -ENOMEM; |
1301 | pn->fioctl = fcn; |
1302 | down_write(&snd_ioctl_rwsem); |
1303 | list_add_tail(&pn->list, lists); |
1304 | up_write(&snd_ioctl_rwsem); |
1305 | return 0; |
1306 | } |
1307 | |
1308 | int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn) |
1309 | { |
1310 | return _snd_ctl_register_ioctl(fcn, &snd_control_ioctls); |
1311 | } |
1312 | |
1313 | EXPORT_SYMBOL(snd_ctl_register_ioctl); |
1314 | |
1315 | #ifdef CONFIG_COMPAT |
1316 | int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn) |
1317 | { |
1318 | return _snd_ctl_register_ioctl(fcn, &snd_control_compat_ioctls); |
1319 | } |
1320 | |
1321 | EXPORT_SYMBOL(snd_ctl_register_ioctl_compat); |
1322 | #endif |
1323 | |
1324 | /* |
1325 | * de-register the device-specific control-ioctls. |
1326 | */ |
1327 | static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn, |
1328 | struct list_head *lists) |
1329 | { |
1330 | struct snd_kctl_ioctl *p; |
1331 | |
1332 | if (snd_BUG_ON(!fcn)) |
1333 | return -EINVAL; |
1334 | down_write(&snd_ioctl_rwsem); |
1335 | list_for_each_entry(p, lists, list) { |
1336 | if (p->fioctl == fcn) { |
1337 | list_del(&p->list); |
1338 | up_write(&snd_ioctl_rwsem); |
1339 | kfree(p); |
1340 | return 0; |
1341 | } |
1342 | } |
1343 | up_write(&snd_ioctl_rwsem); |
1344 | snd_BUG(); |
1345 | return -EINVAL; |
1346 | } |
1347 | |
1348 | int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn) |
1349 | { |
1350 | return _snd_ctl_unregister_ioctl(fcn, &snd_control_ioctls); |
1351 | } |
1352 | |
1353 | EXPORT_SYMBOL(snd_ctl_unregister_ioctl); |
1354 | |
1355 | #ifdef CONFIG_COMPAT |
1356 | int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn) |
1357 | { |
1358 | return _snd_ctl_unregister_ioctl(fcn, &snd_control_compat_ioctls); |
1359 | } |
1360 | |
1361 | EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat); |
1362 | #endif |
1363 | |
1364 | static int snd_ctl_fasync(int fd, struct file * file, int on) |
1365 | { |
1366 | struct snd_ctl_file *ctl; |
1367 | |
1368 | ctl = file->private_data; |
1369 | return fasync_helper(fd, file, on, &ctl->fasync); |
1370 | } |
1371 | |
1372 | /* |
1373 | * ioctl32 compat |
1374 | */ |
1375 | #ifdef CONFIG_COMPAT |
1376 | #include "control_compat.c" |
1377 | #else |
1378 | #define snd_ctl_ioctl_compat NULL |
1379 | #endif |
1380 | |
1381 | /* |
1382 | * INIT PART |
1383 | */ |
1384 | |
1385 | static const struct file_operations snd_ctl_f_ops = |
1386 | { |
1387 | .owner = THIS_MODULE, |
1388 | .read = snd_ctl_read, |
1389 | .open = snd_ctl_open, |
1390 | .release = snd_ctl_release, |
1391 | .poll = snd_ctl_poll, |
1392 | .unlocked_ioctl = snd_ctl_ioctl, |
1393 | .compat_ioctl = snd_ctl_ioctl_compat, |
1394 | .fasync = snd_ctl_fasync, |
1395 | }; |
1396 | |
1397 | /* |
1398 | * registration of the control device |
1399 | */ |
1400 | static int snd_ctl_dev_register(struct snd_device *device) |
1401 | { |
1402 | struct snd_card *card = device->device_data; |
1403 | int err, cardnum; |
1404 | char name[16]; |
1405 | |
1406 | if (snd_BUG_ON(!card)) |
1407 | return -ENXIO; |
1408 | cardnum = card->number; |
1409 | if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS)) |
1410 | return -ENXIO; |
1411 | sprintf(name, "controlC%i", cardnum); |
1412 | if ((err = snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1, |
1413 | &snd_ctl_f_ops, card, name)) < 0) |
1414 | return err; |
1415 | return 0; |
1416 | } |
1417 | |
1418 | /* |
1419 | * disconnection of the control device |
1420 | */ |
1421 | static int snd_ctl_dev_disconnect(struct snd_device *device) |
1422 | { |
1423 | struct snd_card *card = device->device_data; |
1424 | struct snd_ctl_file *ctl; |
1425 | int err, cardnum; |
1426 | |
1427 | if (snd_BUG_ON(!card)) |
1428 | return -ENXIO; |
1429 | cardnum = card->number; |
1430 | if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS)) |
1431 | return -ENXIO; |
1432 | |
1433 | read_lock(&card->ctl_files_rwlock); |
1434 | list_for_each_entry(ctl, &card->ctl_files, list) { |
1435 | wake_up(&ctl->change_sleep); |
1436 | kill_fasync(&ctl->fasync, SIGIO, POLL_ERR); |
1437 | } |
1438 | read_unlock(&card->ctl_files_rwlock); |
1439 | |
1440 | if ((err = snd_unregister_device(SNDRV_DEVICE_TYPE_CONTROL, |
1441 | card, -1)) < 0) |
1442 | return err; |
1443 | return 0; |
1444 | } |
1445 | |
1446 | /* |
1447 | * free all controls |
1448 | */ |
1449 | static int snd_ctl_dev_free(struct snd_device *device) |
1450 | { |
1451 | struct snd_card *card = device->device_data; |
1452 | struct snd_kcontrol *control; |
1453 | |
1454 | down_write(&card->controls_rwsem); |
1455 | while (!list_empty(&card->controls)) { |
1456 | control = snd_kcontrol(card->controls.next); |
1457 | snd_ctl_remove(card, control); |
1458 | } |
1459 | up_write(&card->controls_rwsem); |
1460 | return 0; |
1461 | } |
1462 | |
1463 | /* |
1464 | * create control core: |
1465 | * called from init.c |
1466 | */ |
1467 | int snd_ctl_create(struct snd_card *card) |
1468 | { |
1469 | static struct snd_device_ops ops = { |
1470 | .dev_free = snd_ctl_dev_free, |
1471 | .dev_register = snd_ctl_dev_register, |
1472 | .dev_disconnect = snd_ctl_dev_disconnect, |
1473 | }; |
1474 | |
1475 | if (snd_BUG_ON(!card)) |
1476 | return -ENXIO; |
1477 | return snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops); |
1478 | } |
1479 | |
1480 | /* |
1481 | * Frequently used control callbacks |
1482 | */ |
1483 | int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol, |
1484 | struct snd_ctl_elem_info *uinfo) |
1485 | { |
1486 | uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; |
1487 | uinfo->count = 1; |
1488 | uinfo->value.integer.min = 0; |
1489 | uinfo->value.integer.max = 1; |
1490 | return 0; |
1491 | } |
1492 | |
1493 | EXPORT_SYMBOL(snd_ctl_boolean_mono_info); |
1494 | |
1495 | int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol, |
1496 | struct snd_ctl_elem_info *uinfo) |
1497 | { |
1498 | uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; |
1499 | uinfo->count = 2; |
1500 | uinfo->value.integer.min = 0; |
1501 | uinfo->value.integer.max = 1; |
1502 | return 0; |
1503 | } |
1504 | |
1505 | EXPORT_SYMBOL(snd_ctl_boolean_stereo_info); |
1506 |
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