]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Routines for driver control interface | |
3 | * Copyright (c) by Jaroslav Kysela <perex@suse.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 <sound/driver.h> | |
23 | #include <linux/threads.h> | |
24 | #include <linux/interrupt.h> | |
25 | #include <linux/smp_lock.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/vmalloc.h> | |
28 | #include <linux/time.h> | |
29 | #include <sound/core.h> | |
30 | #include <sound/minors.h> | |
31 | #include <sound/info.h> | |
32 | #include <sound/control.h> | |
33 | ||
34 | /* max number of user-defined controls */ | |
35 | #define MAX_USER_CONTROLS 32 | |
36 | ||
82e9bae6 | 37 | struct snd_kctl_ioctl { |
1da177e4 LT |
38 | struct list_head list; /* list of all ioctls */ |
39 | snd_kctl_ioctl_func_t fioctl; | |
82e9bae6 | 40 | }; |
1da177e4 LT |
41 | |
42 | static DECLARE_RWSEM(snd_ioctl_rwsem); | |
43 | static LIST_HEAD(snd_control_ioctls); | |
44 | #ifdef CONFIG_COMPAT | |
45 | static LIST_HEAD(snd_control_compat_ioctls); | |
46 | #endif | |
47 | ||
48 | static int snd_ctl_open(struct inode *inode, struct file *file) | |
49 | { | |
50 | int cardnum = SNDRV_MINOR_CARD(iminor(inode)); | |
51 | unsigned long flags; | |
82e9bae6 TI |
52 | struct snd_card *card; |
53 | struct snd_ctl_file *ctl; | |
1da177e4 LT |
54 | int err; |
55 | ||
56 | card = snd_cards[cardnum]; | |
57 | if (!card) { | |
58 | err = -ENODEV; | |
59 | goto __error1; | |
60 | } | |
61 | err = snd_card_file_add(card, file); | |
62 | if (err < 0) { | |
63 | err = -ENODEV; | |
64 | goto __error1; | |
65 | } | |
66 | if (!try_module_get(card->module)) { | |
67 | err = -EFAULT; | |
68 | goto __error2; | |
69 | } | |
ca2c0966 | 70 | ctl = kzalloc(sizeof(*ctl), GFP_KERNEL); |
1da177e4 LT |
71 | if (ctl == NULL) { |
72 | err = -ENOMEM; | |
73 | goto __error; | |
74 | } | |
75 | INIT_LIST_HEAD(&ctl->events); | |
76 | init_waitqueue_head(&ctl->change_sleep); | |
77 | spin_lock_init(&ctl->read_lock); | |
78 | ctl->card = card; | |
79 | ctl->pid = current->pid; | |
80 | file->private_data = ctl; | |
81 | write_lock_irqsave(&card->ctl_files_rwlock, flags); | |
82 | list_add_tail(&ctl->list, &card->ctl_files); | |
83 | write_unlock_irqrestore(&card->ctl_files_rwlock, flags); | |
84 | return 0; | |
85 | ||
86 | __error: | |
87 | module_put(card->module); | |
88 | __error2: | |
89 | snd_card_file_remove(card, file); | |
90 | __error1: | |
91 | return err; | |
92 | } | |
93 | ||
82e9bae6 | 94 | static void snd_ctl_empty_read_queue(struct snd_ctl_file * ctl) |
1da177e4 | 95 | { |
82e9bae6 | 96 | struct snd_kctl_event *cread; |
1da177e4 LT |
97 | |
98 | spin_lock(&ctl->read_lock); | |
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(&ctl->read_lock); | |
105 | } | |
106 | ||
107 | static int snd_ctl_release(struct inode *inode, struct file *file) | |
108 | { | |
109 | unsigned long flags; | |
110 | struct list_head *list; | |
82e9bae6 TI |
111 | struct snd_card *card; |
112 | struct snd_ctl_file *ctl; | |
113 | struct snd_kcontrol *control; | |
1da177e4 LT |
114 | unsigned int idx; |
115 | ||
116 | ctl = file->private_data; | |
117 | fasync_helper(-1, file, 0, &ctl->fasync); | |
118 | file->private_data = NULL; | |
119 | card = ctl->card; | |
120 | write_lock_irqsave(&card->ctl_files_rwlock, flags); | |
121 | list_del(&ctl->list); | |
122 | write_unlock_irqrestore(&card->ctl_files_rwlock, flags); | |
123 | down_write(&card->controls_rwsem); | |
124 | list_for_each(list, &card->controls) { | |
125 | control = snd_kcontrol(list); | |
126 | for (idx = 0; idx < control->count; idx++) | |
127 | if (control->vd[idx].owner == ctl) | |
128 | control->vd[idx].owner = NULL; | |
129 | } | |
130 | up_write(&card->controls_rwsem); | |
131 | snd_ctl_empty_read_queue(ctl); | |
132 | kfree(ctl); | |
133 | module_put(card->module); | |
134 | snd_card_file_remove(card, file); | |
135 | return 0; | |
136 | } | |
137 | ||
82e9bae6 TI |
138 | void snd_ctl_notify(struct snd_card *card, unsigned int mask, |
139 | struct snd_ctl_elem_id *id) | |
1da177e4 LT |
140 | { |
141 | unsigned long flags; | |
142 | struct list_head *flist; | |
82e9bae6 TI |
143 | struct snd_ctl_file *ctl; |
144 | struct snd_kctl_event *ev; | |
1da177e4 | 145 | |
7c22f1aa | 146 | snd_assert(card != NULL && id != NULL, return); |
1da177e4 LT |
147 | read_lock(&card->ctl_files_rwlock); |
148 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) | |
149 | card->mixer_oss_change_count++; | |
150 | #endif | |
151 | list_for_each(flist, &card->ctl_files) { | |
152 | struct list_head *elist; | |
153 | ctl = snd_ctl_file(flist); | |
154 | if (!ctl->subscribed) | |
155 | continue; | |
156 | spin_lock_irqsave(&ctl->read_lock, flags); | |
157 | list_for_each(elist, &ctl->events) { | |
158 | ev = snd_kctl_event(elist); | |
159 | if (ev->id.numid == id->numid) { | |
160 | ev->mask |= mask; | |
161 | goto _found; | |
162 | } | |
163 | } | |
ca2c0966 | 164 | ev = kzalloc(sizeof(*ev), GFP_ATOMIC); |
1da177e4 LT |
165 | if (ev) { |
166 | ev->id = *id; | |
167 | ev->mask = mask; | |
168 | list_add_tail(&ev->list, &ctl->events); | |
169 | } else { | |
170 | snd_printk(KERN_ERR "No memory available to allocate event\n"); | |
171 | } | |
172 | _found: | |
173 | wake_up(&ctl->change_sleep); | |
174 | spin_unlock_irqrestore(&ctl->read_lock, flags); | |
175 | kill_fasync(&ctl->fasync, SIGIO, POLL_IN); | |
176 | } | |
177 | read_unlock(&card->ctl_files_rwlock); | |
178 | } | |
179 | ||
180 | /** | |
181 | * snd_ctl_new - create a control instance from the template | |
182 | * @control: the control template | |
183 | * @access: the default control access | |
184 | * | |
82e9bae6 | 185 | * Allocates a new struct snd_kcontrol instance and copies the given template |
1da177e4 LT |
186 | * to the new instance. It does not copy volatile data (access). |
187 | * | |
188 | * Returns the pointer of the new instance, or NULL on failure. | |
189 | */ | |
82e9bae6 | 190 | struct snd_kcontrol *snd_ctl_new(struct snd_kcontrol *control, unsigned int access) |
1da177e4 | 191 | { |
82e9bae6 | 192 | struct snd_kcontrol *kctl; |
1da177e4 LT |
193 | unsigned int idx; |
194 | ||
7c22f1aa TI |
195 | snd_assert(control != NULL, return NULL); |
196 | snd_assert(control->count > 0, return NULL); | |
82e9bae6 | 197 | kctl = kzalloc(sizeof(*kctl) + sizeof(struct snd_kcontrol_volatile) * control->count, GFP_KERNEL); |
1da177e4 LT |
198 | if (kctl == NULL) |
199 | return NULL; | |
200 | *kctl = *control; | |
201 | for (idx = 0; idx < kctl->count; idx++) | |
202 | kctl->vd[idx].access = access; | |
203 | return kctl; | |
204 | } | |
205 | ||
206 | /** | |
207 | * snd_ctl_new1 - create a control instance from the template | |
208 | * @ncontrol: the initialization record | |
209 | * @private_data: the private data to set | |
210 | * | |
82e9bae6 | 211 | * Allocates a new struct snd_kcontrol instance and initialize from the given |
1da177e4 LT |
212 | * template. When the access field of ncontrol is 0, it's assumed as |
213 | * READWRITE access. When the count field is 0, it's assumes as one. | |
214 | * | |
215 | * Returns the pointer of the newly generated instance, or NULL on failure. | |
216 | */ | |
82e9bae6 TI |
217 | struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new *ncontrol, |
218 | void *private_data) | |
1da177e4 | 219 | { |
82e9bae6 | 220 | struct snd_kcontrol kctl; |
1da177e4 LT |
221 | unsigned int access; |
222 | ||
7c22f1aa | 223 | snd_assert(ncontrol != NULL, return NULL); |
1da177e4 LT |
224 | snd_assert(ncontrol->info != NULL, return NULL); |
225 | memset(&kctl, 0, sizeof(kctl)); | |
226 | kctl.id.iface = ncontrol->iface; | |
227 | kctl.id.device = ncontrol->device; | |
228 | kctl.id.subdevice = ncontrol->subdevice; | |
229 | if (ncontrol->name) | |
230 | strlcpy(kctl.id.name, ncontrol->name, sizeof(kctl.id.name)); | |
231 | kctl.id.index = ncontrol->index; | |
232 | kctl.count = ncontrol->count ? ncontrol->count : 1; | |
233 | access = ncontrol->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE : | |
234 | (ncontrol->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|SNDRV_CTL_ELEM_ACCESS_INACTIVE| | |
235 | SNDRV_CTL_ELEM_ACCESS_DINDIRECT|SNDRV_CTL_ELEM_ACCESS_INDIRECT)); | |
236 | kctl.info = ncontrol->info; | |
237 | kctl.get = ncontrol->get; | |
238 | kctl.put = ncontrol->put; | |
239 | kctl.private_value = ncontrol->private_value; | |
240 | kctl.private_data = private_data; | |
241 | return snd_ctl_new(&kctl, access); | |
242 | } | |
243 | ||
244 | /** | |
245 | * snd_ctl_free_one - release the control instance | |
246 | * @kcontrol: the control instance | |
247 | * | |
248 | * Releases the control instance created via snd_ctl_new() | |
249 | * or snd_ctl_new1(). | |
250 | * Don't call this after the control was added to the card. | |
251 | */ | |
82e9bae6 | 252 | void snd_ctl_free_one(struct snd_kcontrol *kcontrol) |
1da177e4 LT |
253 | { |
254 | if (kcontrol) { | |
255 | if (kcontrol->private_free) | |
256 | kcontrol->private_free(kcontrol); | |
257 | kfree(kcontrol); | |
258 | } | |
259 | } | |
260 | ||
82e9bae6 | 261 | static unsigned int snd_ctl_hole_check(struct snd_card *card, |
1da177e4 LT |
262 | unsigned int count) |
263 | { | |
264 | struct list_head *list; | |
82e9bae6 | 265 | struct snd_kcontrol *kctl; |
1da177e4 LT |
266 | |
267 | list_for_each(list, &card->controls) { | |
268 | kctl = snd_kcontrol(list); | |
269 | if ((kctl->id.numid <= card->last_numid && | |
270 | kctl->id.numid + kctl->count > card->last_numid) || | |
271 | (kctl->id.numid <= card->last_numid + count - 1 && | |
272 | kctl->id.numid + kctl->count > card->last_numid + count - 1)) | |
273 | return card->last_numid = kctl->id.numid + kctl->count - 1; | |
274 | } | |
275 | return card->last_numid; | |
276 | } | |
277 | ||
82e9bae6 | 278 | static int snd_ctl_find_hole(struct snd_card *card, unsigned int count) |
1da177e4 LT |
279 | { |
280 | unsigned int last_numid, iter = 100000; | |
281 | ||
282 | last_numid = card->last_numid; | |
283 | while (last_numid != snd_ctl_hole_check(card, count)) { | |
284 | if (--iter == 0) { | |
285 | /* this situation is very unlikely */ | |
286 | snd_printk(KERN_ERR "unable to allocate new control numid\n"); | |
287 | return -ENOMEM; | |
288 | } | |
289 | last_numid = card->last_numid; | |
290 | } | |
291 | return 0; | |
292 | } | |
293 | ||
294 | /** | |
295 | * snd_ctl_add - add the control instance to the card | |
296 | * @card: the card instance | |
297 | * @kcontrol: the control instance to add | |
298 | * | |
299 | * Adds the control instance created via snd_ctl_new() or | |
300 | * snd_ctl_new1() to the given card. Assigns also an unique | |
301 | * numid used for fast search. | |
302 | * | |
303 | * Returns zero if successful, or a negative error code on failure. | |
304 | * | |
305 | * It frees automatically the control which cannot be added. | |
306 | */ | |
82e9bae6 | 307 | int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol) |
1da177e4 | 308 | { |
82e9bae6 | 309 | struct snd_ctl_elem_id id; |
1da177e4 LT |
310 | unsigned int idx; |
311 | ||
7c22f1aa | 312 | snd_assert(card != NULL && kcontrol != NULL, return -EINVAL); |
1da177e4 LT |
313 | snd_assert(kcontrol->info != NULL, return -EINVAL); |
314 | id = kcontrol->id; | |
315 | down_write(&card->controls_rwsem); | |
316 | if (snd_ctl_find_id(card, &id)) { | |
317 | up_write(&card->controls_rwsem); | |
318 | snd_ctl_free_one(kcontrol); | |
319 | snd_printd(KERN_ERR "control %i:%i:%i:%s:%i is already present\n", | |
320 | id.iface, | |
321 | id.device, | |
322 | id.subdevice, | |
323 | id.name, | |
324 | id.index); | |
325 | return -EBUSY; | |
326 | } | |
327 | if (snd_ctl_find_hole(card, kcontrol->count) < 0) { | |
328 | up_write(&card->controls_rwsem); | |
329 | snd_ctl_free_one(kcontrol); | |
330 | return -ENOMEM; | |
331 | } | |
332 | list_add_tail(&kcontrol->list, &card->controls); | |
333 | card->controls_count += kcontrol->count; | |
334 | kcontrol->id.numid = card->last_numid + 1; | |
335 | card->last_numid += kcontrol->count; | |
336 | up_write(&card->controls_rwsem); | |
337 | for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++) | |
338 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id); | |
339 | return 0; | |
340 | } | |
341 | ||
342 | /** | |
343 | * snd_ctl_remove - remove the control from the card and release it | |
344 | * @card: the card instance | |
345 | * @kcontrol: the control instance to remove | |
346 | * | |
347 | * Removes the control from the card and then releases the instance. | |
348 | * You don't need to call snd_ctl_free_one(). You must be in | |
349 | * the write lock - down_write(&card->controls_rwsem). | |
350 | * | |
351 | * Returns 0 if successful, or a negative error code on failure. | |
352 | */ | |
82e9bae6 | 353 | int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol) |
1da177e4 | 354 | { |
82e9bae6 | 355 | struct snd_ctl_elem_id id; |
1da177e4 LT |
356 | unsigned int idx; |
357 | ||
7c22f1aa | 358 | snd_assert(card != NULL && kcontrol != NULL, return -EINVAL); |
1da177e4 LT |
359 | list_del(&kcontrol->list); |
360 | card->controls_count -= kcontrol->count; | |
361 | id = kcontrol->id; | |
362 | for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++) | |
363 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_REMOVE, &id); | |
364 | snd_ctl_free_one(kcontrol); | |
365 | return 0; | |
366 | } | |
367 | ||
368 | /** | |
369 | * snd_ctl_remove_id - remove the control of the given id and release it | |
370 | * @card: the card instance | |
371 | * @id: the control id to remove | |
372 | * | |
373 | * Finds the control instance with the given id, removes it from the | |
374 | * card list and releases it. | |
375 | * | |
376 | * Returns 0 if successful, or a negative error code on failure. | |
377 | */ | |
82e9bae6 | 378 | int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id) |
1da177e4 | 379 | { |
82e9bae6 | 380 | struct snd_kcontrol *kctl; |
1da177e4 LT |
381 | int ret; |
382 | ||
383 | down_write(&card->controls_rwsem); | |
384 | kctl = snd_ctl_find_id(card, id); | |
385 | if (kctl == NULL) { | |
386 | up_write(&card->controls_rwsem); | |
387 | return -ENOENT; | |
388 | } | |
389 | ret = snd_ctl_remove(card, kctl); | |
390 | up_write(&card->controls_rwsem); | |
391 | return ret; | |
392 | } | |
393 | ||
394 | /** | |
395 | * snd_ctl_remove_unlocked_id - remove the unlocked control of the given id and release it | |
396 | * @file: active control handle | |
397 | * @id: the control id to remove | |
398 | * | |
399 | * Finds the control instance with the given id, removes it from the | |
400 | * card list and releases it. | |
401 | * | |
402 | * Returns 0 if successful, or a negative error code on failure. | |
403 | */ | |
82e9bae6 TI |
404 | static int snd_ctl_remove_unlocked_id(struct snd_ctl_file * file, |
405 | struct snd_ctl_elem_id *id) | |
1da177e4 | 406 | { |
82e9bae6 TI |
407 | struct snd_card *card = file->card; |
408 | struct snd_kcontrol *kctl; | |
1da177e4 LT |
409 | int idx, ret; |
410 | ||
411 | down_write(&card->controls_rwsem); | |
412 | kctl = snd_ctl_find_id(card, id); | |
413 | if (kctl == NULL) { | |
414 | up_write(&card->controls_rwsem); | |
415 | return -ENOENT; | |
416 | } | |
417 | for (idx = 0; idx < kctl->count; idx++) | |
418 | if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) { | |
419 | up_write(&card->controls_rwsem); | |
420 | return -EBUSY; | |
421 | } | |
422 | ret = snd_ctl_remove(card, kctl); | |
423 | up_write(&card->controls_rwsem); | |
424 | return ret; | |
425 | } | |
426 | ||
427 | /** | |
428 | * snd_ctl_rename_id - replace the id of a control on the card | |
429 | * @card: the card instance | |
430 | * @src_id: the old id | |
431 | * @dst_id: the new id | |
432 | * | |
433 | * Finds the control with the old id from the card, and replaces the | |
434 | * id with the new one. | |
435 | * | |
436 | * Returns zero if successful, or a negative error code on failure. | |
437 | */ | |
82e9bae6 TI |
438 | int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id, |
439 | struct snd_ctl_elem_id *dst_id) | |
1da177e4 | 440 | { |
82e9bae6 | 441 | struct snd_kcontrol *kctl; |
1da177e4 LT |
442 | |
443 | down_write(&card->controls_rwsem); | |
444 | kctl = snd_ctl_find_id(card, src_id); | |
445 | if (kctl == NULL) { | |
446 | up_write(&card->controls_rwsem); | |
447 | return -ENOENT; | |
448 | } | |
449 | kctl->id = *dst_id; | |
450 | kctl->id.numid = card->last_numid + 1; | |
451 | card->last_numid += kctl->count; | |
452 | up_write(&card->controls_rwsem); | |
453 | return 0; | |
454 | } | |
455 | ||
456 | /** | |
457 | * snd_ctl_find_numid - find the control instance with the given number-id | |
458 | * @card: the card instance | |
459 | * @numid: the number-id to search | |
460 | * | |
461 | * Finds the control instance with the given number-id from the card. | |
462 | * | |
463 | * Returns the pointer of the instance if found, or NULL if not. | |
464 | * | |
465 | * The caller must down card->controls_rwsem before calling this function | |
466 | * (if the race condition can happen). | |
467 | */ | |
82e9bae6 | 468 | struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid) |
1da177e4 LT |
469 | { |
470 | struct list_head *list; | |
82e9bae6 | 471 | struct snd_kcontrol *kctl; |
1da177e4 | 472 | |
7c22f1aa | 473 | snd_assert(card != NULL && numid != 0, return NULL); |
1da177e4 LT |
474 | list_for_each(list, &card->controls) { |
475 | kctl = snd_kcontrol(list); | |
476 | if (kctl->id.numid <= numid && kctl->id.numid + kctl->count > numid) | |
477 | return kctl; | |
478 | } | |
479 | return NULL; | |
480 | } | |
481 | ||
482 | /** | |
483 | * snd_ctl_find_id - find the control instance with the given id | |
484 | * @card: the card instance | |
485 | * @id: the id to search | |
486 | * | |
487 | * Finds the control instance with the given id from the card. | |
488 | * | |
489 | * Returns the pointer of the instance if found, or NULL if not. | |
490 | * | |
491 | * The caller must down card->controls_rwsem before calling this function | |
492 | * (if the race condition can happen). | |
493 | */ | |
82e9bae6 TI |
494 | struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card, |
495 | struct snd_ctl_elem_id *id) | |
1da177e4 LT |
496 | { |
497 | struct list_head *list; | |
82e9bae6 | 498 | struct snd_kcontrol *kctl; |
1da177e4 | 499 | |
7c22f1aa | 500 | snd_assert(card != NULL && id != NULL, return NULL); |
1da177e4 LT |
501 | if (id->numid != 0) |
502 | return snd_ctl_find_numid(card, id->numid); | |
503 | list_for_each(list, &card->controls) { | |
504 | kctl = snd_kcontrol(list); | |
505 | if (kctl->id.iface != id->iface) | |
506 | continue; | |
507 | if (kctl->id.device != id->device) | |
508 | continue; | |
509 | if (kctl->id.subdevice != id->subdevice) | |
510 | continue; | |
511 | if (strncmp(kctl->id.name, id->name, sizeof(kctl->id.name))) | |
512 | continue; | |
513 | if (kctl->id.index > id->index) | |
514 | continue; | |
515 | if (kctl->id.index + kctl->count <= id->index) | |
516 | continue; | |
517 | return kctl; | |
518 | } | |
519 | return NULL; | |
520 | } | |
521 | ||
82e9bae6 | 522 | static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl, |
1da177e4 LT |
523 | unsigned int cmd, void __user *arg) |
524 | { | |
82e9bae6 | 525 | struct snd_ctl_card_info *info; |
1da177e4 | 526 | |
ca2c0966 | 527 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
1da177e4 LT |
528 | if (! info) |
529 | return -ENOMEM; | |
530 | down_read(&snd_ioctl_rwsem); | |
531 | info->card = card->number; | |
532 | strlcpy(info->id, card->id, sizeof(info->id)); | |
533 | strlcpy(info->driver, card->driver, sizeof(info->driver)); | |
534 | strlcpy(info->name, card->shortname, sizeof(info->name)); | |
535 | strlcpy(info->longname, card->longname, sizeof(info->longname)); | |
536 | strlcpy(info->mixername, card->mixername, sizeof(info->mixername)); | |
537 | strlcpy(info->components, card->components, sizeof(info->components)); | |
538 | up_read(&snd_ioctl_rwsem); | |
82e9bae6 | 539 | if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info))) { |
1da177e4 LT |
540 | kfree(info); |
541 | return -EFAULT; | |
542 | } | |
543 | kfree(info); | |
544 | return 0; | |
545 | } | |
546 | ||
82e9bae6 TI |
547 | static int snd_ctl_elem_list(struct snd_card *card, |
548 | struct snd_ctl_elem_list __user *_list) | |
1da177e4 LT |
549 | { |
550 | struct list_head *plist; | |
82e9bae6 TI |
551 | struct snd_ctl_elem_list list; |
552 | struct snd_kcontrol *kctl; | |
553 | struct snd_ctl_elem_id *dst, *id; | |
1da177e4 LT |
554 | unsigned int offset, space, first, jidx; |
555 | ||
556 | if (copy_from_user(&list, _list, sizeof(list))) | |
557 | return -EFAULT; | |
558 | offset = list.offset; | |
559 | space = list.space; | |
560 | first = 0; | |
561 | /* try limit maximum space */ | |
562 | if (space > 16384) | |
563 | return -ENOMEM; | |
564 | if (space > 0) { | |
565 | /* allocate temporary buffer for atomic operation */ | |
82e9bae6 | 566 | dst = vmalloc(space * sizeof(struct snd_ctl_elem_id)); |
1da177e4 LT |
567 | if (dst == NULL) |
568 | return -ENOMEM; | |
569 | down_read(&card->controls_rwsem); | |
570 | list.count = card->controls_count; | |
571 | plist = card->controls.next; | |
572 | while (plist != &card->controls) { | |
573 | if (offset == 0) | |
574 | break; | |
575 | kctl = snd_kcontrol(plist); | |
576 | if (offset < kctl->count) | |
577 | break; | |
578 | offset -= kctl->count; | |
579 | plist = plist->next; | |
580 | } | |
581 | list.used = 0; | |
582 | id = dst; | |
583 | while (space > 0 && plist != &card->controls) { | |
584 | kctl = snd_kcontrol(plist); | |
585 | for (jidx = offset; space > 0 && jidx < kctl->count; jidx++) { | |
586 | snd_ctl_build_ioff(id, kctl, jidx); | |
587 | id++; | |
588 | space--; | |
589 | list.used++; | |
590 | } | |
591 | plist = plist->next; | |
592 | offset = 0; | |
593 | } | |
594 | up_read(&card->controls_rwsem); | |
82e9bae6 TI |
595 | if (list.used > 0 && |
596 | copy_to_user(list.pids, dst, | |
597 | list.used * sizeof(struct snd_ctl_elem_id))) { | |
1da177e4 LT |
598 | vfree(dst); |
599 | return -EFAULT; | |
600 | } | |
601 | vfree(dst); | |
602 | } else { | |
603 | down_read(&card->controls_rwsem); | |
604 | list.count = card->controls_count; | |
605 | up_read(&card->controls_rwsem); | |
606 | } | |
607 | if (copy_to_user(_list, &list, sizeof(list))) | |
608 | return -EFAULT; | |
609 | return 0; | |
610 | } | |
611 | ||
82e9bae6 TI |
612 | static int snd_ctl_elem_info(struct snd_ctl_file *ctl, |
613 | struct snd_ctl_elem_info *info) | |
1da177e4 | 614 | { |
82e9bae6 TI |
615 | struct snd_card *card = ctl->card; |
616 | struct snd_kcontrol *kctl; | |
617 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
618 | unsigned int index_offset; |
619 | int result; | |
620 | ||
621 | down_read(&card->controls_rwsem); | |
622 | kctl = snd_ctl_find_id(card, &info->id); | |
623 | if (kctl == NULL) { | |
624 | up_read(&card->controls_rwsem); | |
625 | return -ENOENT; | |
626 | } | |
627 | #ifdef CONFIG_SND_DEBUG | |
628 | info->access = 0; | |
629 | #endif | |
630 | result = kctl->info(kctl, info); | |
631 | if (result >= 0) { | |
632 | snd_assert(info->access == 0, ); | |
633 | index_offset = snd_ctl_get_ioff(kctl, &info->id); | |
634 | vd = &kctl->vd[index_offset]; | |
635 | snd_ctl_build_ioff(&info->id, kctl, index_offset); | |
636 | info->access = vd->access; | |
637 | if (vd->owner) { | |
638 | info->access |= SNDRV_CTL_ELEM_ACCESS_LOCK; | |
639 | if (vd->owner == ctl) | |
640 | info->access |= SNDRV_CTL_ELEM_ACCESS_OWNER; | |
641 | info->owner = vd->owner_pid; | |
642 | } else { | |
643 | info->owner = -1; | |
644 | } | |
645 | } | |
646 | up_read(&card->controls_rwsem); | |
647 | return result; | |
648 | } | |
649 | ||
82e9bae6 TI |
650 | static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl, |
651 | struct snd_ctl_elem_info __user *_info) | |
1da177e4 | 652 | { |
82e9bae6 | 653 | struct snd_ctl_elem_info info; |
1da177e4 LT |
654 | int result; |
655 | ||
656 | if (copy_from_user(&info, _info, sizeof(info))) | |
657 | return -EFAULT; | |
658 | result = snd_ctl_elem_info(ctl, &info); | |
659 | if (result >= 0) | |
660 | if (copy_to_user(_info, &info, sizeof(info))) | |
661 | return -EFAULT; | |
662 | return result; | |
663 | } | |
664 | ||
82e9bae6 | 665 | int snd_ctl_elem_read(struct snd_card *card, struct snd_ctl_elem_value *control) |
1da177e4 | 666 | { |
82e9bae6 TI |
667 | struct snd_kcontrol *kctl; |
668 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
669 | unsigned int index_offset; |
670 | int result, indirect; | |
671 | ||
672 | down_read(&card->controls_rwsem); | |
673 | kctl = snd_ctl_find_id(card, &control->id); | |
674 | if (kctl == NULL) { | |
675 | result = -ENOENT; | |
676 | } else { | |
677 | index_offset = snd_ctl_get_ioff(kctl, &control->id); | |
678 | vd = &kctl->vd[index_offset]; | |
679 | indirect = vd->access & SNDRV_CTL_ELEM_ACCESS_INDIRECT ? 1 : 0; | |
680 | if (control->indirect != indirect) { | |
681 | result = -EACCES; | |
682 | } else { | |
683 | if ((vd->access & SNDRV_CTL_ELEM_ACCESS_READ) && kctl->get != NULL) { | |
684 | snd_ctl_build_ioff(&control->id, kctl, index_offset); | |
685 | result = kctl->get(kctl, control); | |
686 | } else { | |
687 | result = -EPERM; | |
688 | } | |
689 | } | |
690 | } | |
691 | up_read(&card->controls_rwsem); | |
692 | return result; | |
693 | } | |
694 | ||
82e9bae6 TI |
695 | static int snd_ctl_elem_read_user(struct snd_card *card, |
696 | struct snd_ctl_elem_value __user *_control) | |
1da177e4 | 697 | { |
82e9bae6 | 698 | struct snd_ctl_elem_value *control; |
1da177e4 LT |
699 | int result; |
700 | ||
701 | control = kmalloc(sizeof(*control), GFP_KERNEL); | |
702 | if (control == NULL) | |
703 | return -ENOMEM; | |
704 | if (copy_from_user(control, _control, sizeof(*control))) { | |
705 | kfree(control); | |
706 | return -EFAULT; | |
707 | } | |
708 | result = snd_ctl_elem_read(card, control); | |
709 | if (result >= 0) | |
710 | if (copy_to_user(_control, control, sizeof(*control))) | |
711 | result = -EFAULT; | |
712 | kfree(control); | |
713 | return result; | |
714 | } | |
715 | ||
82e9bae6 TI |
716 | int snd_ctl_elem_write(struct snd_card *card, struct snd_ctl_file *file, |
717 | struct snd_ctl_elem_value *control) | |
1da177e4 | 718 | { |
82e9bae6 TI |
719 | struct snd_kcontrol *kctl; |
720 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
721 | unsigned int index_offset; |
722 | int result, indirect; | |
723 | ||
724 | down_read(&card->controls_rwsem); | |
725 | kctl = snd_ctl_find_id(card, &control->id); | |
726 | if (kctl == NULL) { | |
727 | result = -ENOENT; | |
728 | } else { | |
729 | index_offset = snd_ctl_get_ioff(kctl, &control->id); | |
730 | vd = &kctl->vd[index_offset]; | |
731 | indirect = vd->access & SNDRV_CTL_ELEM_ACCESS_INDIRECT ? 1 : 0; | |
732 | if (control->indirect != indirect) { | |
733 | result = -EACCES; | |
734 | } else { | |
735 | if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_WRITE) || | |
736 | kctl->put == NULL || | |
737 | (file && vd->owner != NULL && vd->owner != file)) { | |
738 | result = -EPERM; | |
739 | } else { | |
740 | snd_ctl_build_ioff(&control->id, kctl, index_offset); | |
741 | result = kctl->put(kctl, control); | |
742 | } | |
743 | if (result > 0) { | |
744 | up_read(&card->controls_rwsem); | |
745 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, &control->id); | |
746 | return 0; | |
747 | } | |
748 | } | |
749 | } | |
750 | up_read(&card->controls_rwsem); | |
751 | return result; | |
752 | } | |
753 | ||
82e9bae6 TI |
754 | static int snd_ctl_elem_write_user(struct snd_ctl_file *file, |
755 | struct snd_ctl_elem_value __user *_control) | |
1da177e4 | 756 | { |
82e9bae6 | 757 | struct snd_ctl_elem_value *control; |
1da177e4 LT |
758 | int result; |
759 | ||
760 | control = kmalloc(sizeof(*control), GFP_KERNEL); | |
761 | if (control == NULL) | |
762 | return -ENOMEM; | |
763 | if (copy_from_user(control, _control, sizeof(*control))) { | |
764 | kfree(control); | |
765 | return -EFAULT; | |
766 | } | |
767 | result = snd_ctl_elem_write(file->card, file, control); | |
768 | if (result >= 0) | |
769 | if (copy_to_user(_control, control, sizeof(*control))) | |
770 | result = -EFAULT; | |
771 | kfree(control); | |
772 | return result; | |
773 | } | |
774 | ||
82e9bae6 TI |
775 | static int snd_ctl_elem_lock(struct snd_ctl_file *file, |
776 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 777 | { |
82e9bae6 TI |
778 | struct snd_card *card = file->card; |
779 | struct snd_ctl_elem_id id; | |
780 | struct snd_kcontrol *kctl; | |
781 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
782 | int result; |
783 | ||
784 | if (copy_from_user(&id, _id, sizeof(id))) | |
785 | return -EFAULT; | |
786 | down_write(&card->controls_rwsem); | |
787 | kctl = snd_ctl_find_id(card, &id); | |
788 | if (kctl == NULL) { | |
789 | result = -ENOENT; | |
790 | } else { | |
791 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; | |
792 | if (vd->owner != NULL) | |
793 | result = -EBUSY; | |
794 | else { | |
795 | vd->owner = file; | |
796 | vd->owner_pid = current->pid; | |
797 | result = 0; | |
798 | } | |
799 | } | |
800 | up_write(&card->controls_rwsem); | |
801 | return result; | |
802 | } | |
803 | ||
82e9bae6 TI |
804 | static int snd_ctl_elem_unlock(struct snd_ctl_file *file, |
805 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 806 | { |
82e9bae6 TI |
807 | struct snd_card *card = file->card; |
808 | struct snd_ctl_elem_id id; | |
809 | struct snd_kcontrol *kctl; | |
810 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
811 | int result; |
812 | ||
813 | if (copy_from_user(&id, _id, sizeof(id))) | |
814 | return -EFAULT; | |
815 | down_write(&card->controls_rwsem); | |
816 | kctl = snd_ctl_find_id(card, &id); | |
817 | if (kctl == NULL) { | |
818 | result = -ENOENT; | |
819 | } else { | |
820 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; | |
821 | if (vd->owner == NULL) | |
822 | result = -EINVAL; | |
823 | else if (vd->owner != file) | |
824 | result = -EPERM; | |
825 | else { | |
826 | vd->owner = NULL; | |
827 | vd->owner_pid = 0; | |
828 | result = 0; | |
829 | } | |
830 | } | |
831 | up_write(&card->controls_rwsem); | |
832 | return result; | |
833 | } | |
834 | ||
835 | struct user_element { | |
82e9bae6 | 836 | struct snd_ctl_elem_info info; |
1da177e4 LT |
837 | void *elem_data; /* element data */ |
838 | unsigned long elem_data_size; /* size of element data in bytes */ | |
839 | void *priv_data; /* private data (like strings for enumerated type) */ | |
840 | unsigned long priv_data_size; /* size of private data in bytes */ | |
841 | }; | |
842 | ||
82e9bae6 TI |
843 | static int snd_ctl_elem_user_info(struct snd_kcontrol *kcontrol, |
844 | struct snd_ctl_elem_info *uinfo) | |
1da177e4 LT |
845 | { |
846 | struct user_element *ue = kcontrol->private_data; | |
847 | ||
848 | *uinfo = ue->info; | |
849 | return 0; | |
850 | } | |
851 | ||
82e9bae6 TI |
852 | static int snd_ctl_elem_user_get(struct snd_kcontrol *kcontrol, |
853 | struct snd_ctl_elem_value *ucontrol) | |
1da177e4 LT |
854 | { |
855 | struct user_element *ue = kcontrol->private_data; | |
856 | ||
857 | memcpy(&ucontrol->value, ue->elem_data, ue->elem_data_size); | |
858 | return 0; | |
859 | } | |
860 | ||
82e9bae6 TI |
861 | static int snd_ctl_elem_user_put(struct snd_kcontrol *kcontrol, |
862 | struct snd_ctl_elem_value *ucontrol) | |
1da177e4 LT |
863 | { |
864 | int change; | |
865 | struct user_element *ue = kcontrol->private_data; | |
866 | ||
867 | change = memcmp(&ucontrol->value, ue->elem_data, ue->elem_data_size) != 0; | |
868 | if (change) | |
869 | memcpy(ue->elem_data, &ucontrol->value, ue->elem_data_size); | |
870 | return change; | |
871 | } | |
872 | ||
82e9bae6 | 873 | static void snd_ctl_elem_user_free(struct snd_kcontrol *kcontrol) |
1da177e4 LT |
874 | { |
875 | kfree(kcontrol->private_data); | |
876 | } | |
877 | ||
82e9bae6 TI |
878 | static int snd_ctl_elem_add(struct snd_ctl_file *file, |
879 | struct snd_ctl_elem_info *info, int replace) | |
1da177e4 | 880 | { |
82e9bae6 TI |
881 | struct snd_card *card = file->card; |
882 | struct snd_kcontrol kctl, *_kctl; | |
1da177e4 LT |
883 | unsigned int access; |
884 | long private_size; | |
885 | struct user_element *ue; | |
886 | int idx, err; | |
887 | ||
888 | if (card->user_ctl_count >= MAX_USER_CONTROLS) | |
889 | return -ENOMEM; | |
890 | if (info->count > 1024) | |
891 | return -EINVAL; | |
892 | access = info->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE : | |
82e9bae6 TI |
893 | (info->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE| |
894 | SNDRV_CTL_ELEM_ACCESS_INACTIVE)); | |
1da177e4 LT |
895 | info->id.numid = 0; |
896 | memset(&kctl, 0, sizeof(kctl)); | |
897 | down_write(&card->controls_rwsem); | |
898 | _kctl = snd_ctl_find_id(card, &info->id); | |
899 | err = 0; | |
900 | if (_kctl) { | |
901 | if (replace) | |
902 | err = snd_ctl_remove(card, _kctl); | |
903 | else | |
904 | err = -EBUSY; | |
905 | } else { | |
906 | if (replace) | |
907 | err = -ENOENT; | |
908 | } | |
909 | up_write(&card->controls_rwsem); | |
910 | if (err < 0) | |
911 | return err; | |
912 | memcpy(&kctl.id, &info->id, sizeof(info->id)); | |
913 | kctl.count = info->owner ? info->owner : 1; | |
914 | access |= SNDRV_CTL_ELEM_ACCESS_USER; | |
915 | kctl.info = snd_ctl_elem_user_info; | |
916 | if (access & SNDRV_CTL_ELEM_ACCESS_READ) | |
917 | kctl.get = snd_ctl_elem_user_get; | |
918 | if (access & SNDRV_CTL_ELEM_ACCESS_WRITE) | |
919 | kctl.put = snd_ctl_elem_user_put; | |
920 | switch (info->type) { | |
921 | case SNDRV_CTL_ELEM_TYPE_BOOLEAN: | |
922 | private_size = sizeof(char); | |
923 | if (info->count > 128) | |
924 | return -EINVAL; | |
925 | break; | |
926 | case SNDRV_CTL_ELEM_TYPE_INTEGER: | |
927 | private_size = sizeof(long); | |
928 | if (info->count > 128) | |
929 | return -EINVAL; | |
930 | break; | |
931 | case SNDRV_CTL_ELEM_TYPE_INTEGER64: | |
932 | private_size = sizeof(long long); | |
933 | if (info->count > 64) | |
934 | return -EINVAL; | |
935 | break; | |
936 | case SNDRV_CTL_ELEM_TYPE_BYTES: | |
937 | private_size = sizeof(unsigned char); | |
938 | if (info->count > 512) | |
939 | return -EINVAL; | |
940 | break; | |
941 | case SNDRV_CTL_ELEM_TYPE_IEC958: | |
82e9bae6 | 942 | private_size = sizeof(struct snd_aes_iec958); |
1da177e4 LT |
943 | if (info->count != 1) |
944 | return -EINVAL; | |
945 | break; | |
946 | default: | |
947 | return -EINVAL; | |
948 | } | |
949 | private_size *= info->count; | |
ca2c0966 | 950 | ue = kzalloc(sizeof(struct user_element) + private_size, GFP_KERNEL); |
1da177e4 LT |
951 | if (ue == NULL) |
952 | return -ENOMEM; | |
953 | ue->info = *info; | |
954 | ue->elem_data = (char *)ue + sizeof(*ue); | |
955 | ue->elem_data_size = private_size; | |
956 | kctl.private_free = snd_ctl_elem_user_free; | |
957 | _kctl = snd_ctl_new(&kctl, access); | |
958 | if (_kctl == NULL) { | |
959 | kfree(_kctl->private_data); | |
960 | return -ENOMEM; | |
961 | } | |
962 | _kctl->private_data = ue; | |
963 | for (idx = 0; idx < _kctl->count; idx++) | |
964 | _kctl->vd[idx].owner = file; | |
965 | err = snd_ctl_add(card, _kctl); | |
966 | if (err < 0) { | |
967 | snd_ctl_free_one(_kctl); | |
968 | return err; | |
969 | } | |
970 | ||
971 | down_write(&card->controls_rwsem); | |
972 | card->user_ctl_count++; | |
973 | up_write(&card->controls_rwsem); | |
974 | ||
975 | return 0; | |
976 | } | |
977 | ||
82e9bae6 TI |
978 | static int snd_ctl_elem_add_user(struct snd_ctl_file *file, |
979 | struct snd_ctl_elem_info __user *_info, int replace) | |
1da177e4 | 980 | { |
82e9bae6 | 981 | struct snd_ctl_elem_info info; |
1da177e4 LT |
982 | if (copy_from_user(&info, _info, sizeof(info))) |
983 | return -EFAULT; | |
984 | return snd_ctl_elem_add(file, &info, replace); | |
985 | } | |
986 | ||
82e9bae6 TI |
987 | static int snd_ctl_elem_remove(struct snd_ctl_file *file, |
988 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 989 | { |
82e9bae6 | 990 | struct snd_ctl_elem_id id; |
1da177e4 LT |
991 | int err; |
992 | ||
993 | if (copy_from_user(&id, _id, sizeof(id))) | |
994 | return -EFAULT; | |
995 | err = snd_ctl_remove_unlocked_id(file, &id); | |
996 | if (! err) { | |
82e9bae6 | 997 | struct snd_card *card = file->card; |
1da177e4 LT |
998 | down_write(&card->controls_rwsem); |
999 | card->user_ctl_count--; | |
1000 | up_write(&card->controls_rwsem); | |
1001 | } | |
1002 | return err; | |
1003 | } | |
1004 | ||
82e9bae6 | 1005 | static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr) |
1da177e4 LT |
1006 | { |
1007 | int subscribe; | |
1008 | if (get_user(subscribe, ptr)) | |
1009 | return -EFAULT; | |
1010 | if (subscribe < 0) { | |
1011 | subscribe = file->subscribed; | |
1012 | if (put_user(subscribe, ptr)) | |
1013 | return -EFAULT; | |
1014 | return 0; | |
1015 | } | |
1016 | if (subscribe) { | |
1017 | file->subscribed = 1; | |
1018 | return 0; | |
1019 | } else if (file->subscribed) { | |
1020 | snd_ctl_empty_read_queue(file); | |
1021 | file->subscribed = 0; | |
1022 | } | |
1023 | return 0; | |
1024 | } | |
1025 | ||
1da177e4 LT |
1026 | static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1027 | { | |
82e9bae6 TI |
1028 | struct snd_ctl_file *ctl; |
1029 | struct snd_card *card; | |
1da177e4 | 1030 | struct list_head *list; |
82e9bae6 | 1031 | struct snd_kctl_ioctl *p; |
1da177e4 LT |
1032 | void __user *argp = (void __user *)arg; |
1033 | int __user *ip = argp; | |
1034 | int err; | |
1035 | ||
1036 | ctl = file->private_data; | |
1037 | card = ctl->card; | |
1038 | snd_assert(card != NULL, return -ENXIO); | |
1039 | switch (cmd) { | |
1040 | case SNDRV_CTL_IOCTL_PVERSION: | |
1041 | return put_user(SNDRV_CTL_VERSION, ip) ? -EFAULT : 0; | |
1042 | case SNDRV_CTL_IOCTL_CARD_INFO: | |
1043 | return snd_ctl_card_info(card, ctl, cmd, argp); | |
1044 | case SNDRV_CTL_IOCTL_ELEM_LIST: | |
1045 | return snd_ctl_elem_list(ctl->card, argp); | |
1046 | case SNDRV_CTL_IOCTL_ELEM_INFO: | |
1047 | return snd_ctl_elem_info_user(ctl, argp); | |
1048 | case SNDRV_CTL_IOCTL_ELEM_READ: | |
1049 | return snd_ctl_elem_read_user(ctl->card, argp); | |
1050 | case SNDRV_CTL_IOCTL_ELEM_WRITE: | |
1051 | return snd_ctl_elem_write_user(ctl, argp); | |
1052 | case SNDRV_CTL_IOCTL_ELEM_LOCK: | |
1053 | return snd_ctl_elem_lock(ctl, argp); | |
1054 | case SNDRV_CTL_IOCTL_ELEM_UNLOCK: | |
1055 | return snd_ctl_elem_unlock(ctl, argp); | |
1056 | case SNDRV_CTL_IOCTL_ELEM_ADD: | |
1057 | return snd_ctl_elem_add_user(ctl, argp, 0); | |
1058 | case SNDRV_CTL_IOCTL_ELEM_REPLACE: | |
1059 | return snd_ctl_elem_add_user(ctl, argp, 1); | |
1060 | case SNDRV_CTL_IOCTL_ELEM_REMOVE: | |
1061 | return snd_ctl_elem_remove(ctl, argp); | |
1062 | case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS: | |
1063 | return snd_ctl_subscribe_events(ctl, ip); | |
1064 | case SNDRV_CTL_IOCTL_POWER: | |
a381a7a6 | 1065 | return -ENOPROTOOPT; |
1da177e4 LT |
1066 | case SNDRV_CTL_IOCTL_POWER_STATE: |
1067 | #ifdef CONFIG_PM | |
1068 | return put_user(card->power_state, ip) ? -EFAULT : 0; | |
1069 | #else | |
1070 | return put_user(SNDRV_CTL_POWER_D0, ip) ? -EFAULT : 0; | |
1071 | #endif | |
1072 | } | |
1073 | down_read(&snd_ioctl_rwsem); | |
1074 | list_for_each(list, &snd_control_ioctls) { | |
82e9bae6 | 1075 | p = list_entry(list, struct snd_kctl_ioctl, list); |
1da177e4 LT |
1076 | err = p->fioctl(card, ctl, cmd, arg); |
1077 | if (err != -ENOIOCTLCMD) { | |
1078 | up_read(&snd_ioctl_rwsem); | |
1079 | return err; | |
1080 | } | |
1081 | } | |
1082 | up_read(&snd_ioctl_rwsem); | |
6d85be61 | 1083 | snd_printdd("unknown ioctl = 0x%x\n", cmd); |
1da177e4 LT |
1084 | return -ENOTTY; |
1085 | } | |
1086 | ||
82e9bae6 TI |
1087 | static ssize_t snd_ctl_read(struct file *file, char __user *buffer, |
1088 | size_t count, loff_t * offset) | |
1da177e4 | 1089 | { |
82e9bae6 | 1090 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1091 | int err = 0; |
1092 | ssize_t result = 0; | |
1093 | ||
1094 | ctl = file->private_data; | |
1095 | snd_assert(ctl != NULL && ctl->card != NULL, return -ENXIO); | |
1096 | if (!ctl->subscribed) | |
1097 | return -EBADFD; | |
82e9bae6 | 1098 | if (count < sizeof(struct snd_ctl_event)) |
1da177e4 LT |
1099 | return -EINVAL; |
1100 | spin_lock_irq(&ctl->read_lock); | |
82e9bae6 TI |
1101 | while (count >= sizeof(struct snd_ctl_event)) { |
1102 | struct snd_ctl_event ev; | |
1103 | struct snd_kctl_event *kev; | |
1da177e4 LT |
1104 | while (list_empty(&ctl->events)) { |
1105 | wait_queue_t wait; | |
1106 | if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { | |
1107 | err = -EAGAIN; | |
1108 | goto __end_lock; | |
1109 | } | |
1110 | init_waitqueue_entry(&wait, current); | |
1111 | add_wait_queue(&ctl->change_sleep, &wait); | |
1112 | set_current_state(TASK_INTERRUPTIBLE); | |
1113 | spin_unlock_irq(&ctl->read_lock); | |
1114 | schedule(); | |
1115 | remove_wait_queue(&ctl->change_sleep, &wait); | |
1116 | if (signal_pending(current)) | |
1117 | return result > 0 ? result : -ERESTARTSYS; | |
1118 | spin_lock_irq(&ctl->read_lock); | |
1119 | } | |
1120 | kev = snd_kctl_event(ctl->events.next); | |
1121 | ev.type = SNDRV_CTL_EVENT_ELEM; | |
1122 | ev.data.elem.mask = kev->mask; | |
1123 | ev.data.elem.id = kev->id; | |
1124 | list_del(&kev->list); | |
1125 | spin_unlock_irq(&ctl->read_lock); | |
1126 | kfree(kev); | |
82e9bae6 | 1127 | if (copy_to_user(buffer, &ev, sizeof(struct snd_ctl_event))) { |
1da177e4 LT |
1128 | err = -EFAULT; |
1129 | goto __end; | |
1130 | } | |
1131 | spin_lock_irq(&ctl->read_lock); | |
82e9bae6 TI |
1132 | buffer += sizeof(struct snd_ctl_event); |
1133 | count -= sizeof(struct snd_ctl_event); | |
1134 | result += sizeof(struct snd_ctl_event); | |
1da177e4 LT |
1135 | } |
1136 | __end_lock: | |
1137 | spin_unlock_irq(&ctl->read_lock); | |
1138 | __end: | |
1139 | return result > 0 ? result : err; | |
1140 | } | |
1141 | ||
1142 | static unsigned int snd_ctl_poll(struct file *file, poll_table * wait) | |
1143 | { | |
1144 | unsigned int mask; | |
82e9bae6 | 1145 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1146 | |
1147 | ctl = file->private_data; | |
1148 | if (!ctl->subscribed) | |
1149 | return 0; | |
1150 | poll_wait(file, &ctl->change_sleep, wait); | |
1151 | ||
1152 | mask = 0; | |
1153 | if (!list_empty(&ctl->events)) | |
1154 | mask |= POLLIN | POLLRDNORM; | |
1155 | ||
1156 | return mask; | |
1157 | } | |
1158 | ||
1159 | /* | |
1160 | * register the device-specific control-ioctls. | |
1161 | * called from each device manager like pcm.c, hwdep.c, etc. | |
1162 | */ | |
1163 | static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists) | |
1164 | { | |
82e9bae6 | 1165 | struct snd_kctl_ioctl *pn; |
1da177e4 | 1166 | |
82e9bae6 | 1167 | pn = kzalloc(sizeof(struct snd_kctl_ioctl), GFP_KERNEL); |
1da177e4 LT |
1168 | if (pn == NULL) |
1169 | return -ENOMEM; | |
1170 | pn->fioctl = fcn; | |
1171 | down_write(&snd_ioctl_rwsem); | |
1172 | list_add_tail(&pn->list, lists); | |
1173 | up_write(&snd_ioctl_rwsem); | |
1174 | return 0; | |
1175 | } | |
1176 | ||
1177 | int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn) | |
1178 | { | |
1179 | return _snd_ctl_register_ioctl(fcn, &snd_control_ioctls); | |
1180 | } | |
1181 | ||
1182 | #ifdef CONFIG_COMPAT | |
1183 | int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn) | |
1184 | { | |
1185 | return _snd_ctl_register_ioctl(fcn, &snd_control_compat_ioctls); | |
1186 | } | |
1187 | #endif | |
1188 | ||
1189 | /* | |
1190 | * de-register the device-specific control-ioctls. | |
1191 | */ | |
82e9bae6 TI |
1192 | static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn, |
1193 | struct list_head *lists) | |
1da177e4 LT |
1194 | { |
1195 | struct list_head *list; | |
82e9bae6 | 1196 | struct snd_kctl_ioctl *p; |
1da177e4 | 1197 | |
7c22f1aa | 1198 | snd_assert(fcn != NULL, return -EINVAL); |
1da177e4 LT |
1199 | down_write(&snd_ioctl_rwsem); |
1200 | list_for_each(list, lists) { | |
82e9bae6 | 1201 | p = list_entry(list, struct snd_kctl_ioctl, list); |
1da177e4 LT |
1202 | if (p->fioctl == fcn) { |
1203 | list_del(&p->list); | |
1204 | up_write(&snd_ioctl_rwsem); | |
1205 | kfree(p); | |
1206 | return 0; | |
1207 | } | |
1208 | } | |
1209 | up_write(&snd_ioctl_rwsem); | |
1210 | snd_BUG(); | |
1211 | return -EINVAL; | |
1212 | } | |
1213 | ||
1214 | int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn) | |
1215 | { | |
1216 | return _snd_ctl_unregister_ioctl(fcn, &snd_control_ioctls); | |
1217 | } | |
1218 | ||
1219 | #ifdef CONFIG_COMPAT | |
1220 | int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn) | |
1221 | { | |
1222 | return _snd_ctl_unregister_ioctl(fcn, &snd_control_compat_ioctls); | |
1223 | } | |
1224 | ||
1225 | #endif | |
1226 | ||
1227 | static int snd_ctl_fasync(int fd, struct file * file, int on) | |
1228 | { | |
82e9bae6 | 1229 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1230 | int err; |
1231 | ctl = file->private_data; | |
1232 | err = fasync_helper(fd, file, on, &ctl->fasync); | |
1233 | if (err < 0) | |
1234 | return err; | |
1235 | return 0; | |
1236 | } | |
1237 | ||
1238 | /* | |
1239 | * ioctl32 compat | |
1240 | */ | |
1241 | #ifdef CONFIG_COMPAT | |
1242 | #include "control_compat.c" | |
1243 | #else | |
1244 | #define snd_ctl_ioctl_compat NULL | |
1245 | #endif | |
1246 | ||
1247 | /* | |
1248 | * INIT PART | |
1249 | */ | |
1250 | ||
1251 | static struct file_operations snd_ctl_f_ops = | |
1252 | { | |
1253 | .owner = THIS_MODULE, | |
1254 | .read = snd_ctl_read, | |
1255 | .open = snd_ctl_open, | |
1256 | .release = snd_ctl_release, | |
1257 | .poll = snd_ctl_poll, | |
1258 | .unlocked_ioctl = snd_ctl_ioctl, | |
1259 | .compat_ioctl = snd_ctl_ioctl_compat, | |
1260 | .fasync = snd_ctl_fasync, | |
1261 | }; | |
1262 | ||
82e9bae6 | 1263 | static struct snd_minor snd_ctl_reg = |
1da177e4 LT |
1264 | { |
1265 | .comment = "ctl", | |
1266 | .f_ops = &snd_ctl_f_ops, | |
1267 | }; | |
1268 | ||
1269 | /* | |
1270 | * registration of the control device | |
1271 | */ | |
82e9bae6 | 1272 | static int snd_ctl_dev_register(struct snd_device *device) |
1da177e4 | 1273 | { |
82e9bae6 | 1274 | struct snd_card *card = device->device_data; |
1da177e4 LT |
1275 | int err, cardnum; |
1276 | char name[16]; | |
1277 | ||
1278 | snd_assert(card != NULL, return -ENXIO); | |
1279 | cardnum = card->number; | |
1280 | snd_assert(cardnum >= 0 && cardnum < SNDRV_CARDS, return -ENXIO); | |
1281 | sprintf(name, "controlC%i", cardnum); | |
1282 | if ((err = snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, | |
1283 | card, 0, &snd_ctl_reg, name)) < 0) | |
1284 | return err; | |
1285 | return 0; | |
1286 | } | |
1287 | ||
1288 | /* | |
1289 | * disconnection of the control device | |
1290 | */ | |
82e9bae6 | 1291 | static int snd_ctl_dev_disconnect(struct snd_device *device) |
1da177e4 | 1292 | { |
82e9bae6 | 1293 | struct snd_card *card = device->device_data; |
1da177e4 | 1294 | struct list_head *flist; |
82e9bae6 | 1295 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1296 | |
1297 | down_read(&card->controls_rwsem); | |
1298 | list_for_each(flist, &card->ctl_files) { | |
1299 | ctl = snd_ctl_file(flist); | |
1300 | wake_up(&ctl->change_sleep); | |
1301 | kill_fasync(&ctl->fasync, SIGIO, POLL_ERR); | |
1302 | } | |
1303 | up_read(&card->controls_rwsem); | |
1304 | return 0; | |
1305 | } | |
1306 | ||
1307 | /* | |
1308 | * free all controls | |
1309 | */ | |
82e9bae6 | 1310 | static int snd_ctl_dev_free(struct snd_device *device) |
1da177e4 | 1311 | { |
82e9bae6 TI |
1312 | struct snd_card *card = device->device_data; |
1313 | struct snd_kcontrol *control; | |
1da177e4 LT |
1314 | |
1315 | down_write(&card->controls_rwsem); | |
1316 | while (!list_empty(&card->controls)) { | |
1317 | control = snd_kcontrol(card->controls.next); | |
1318 | snd_ctl_remove(card, control); | |
1319 | } | |
1320 | up_write(&card->controls_rwsem); | |
1321 | return 0; | |
1322 | } | |
1323 | ||
1324 | /* | |
1325 | * de-registration of the control device | |
1326 | */ | |
82e9bae6 | 1327 | static int snd_ctl_dev_unregister(struct snd_device *device) |
1da177e4 | 1328 | { |
82e9bae6 | 1329 | struct snd_card *card = device->device_data; |
1da177e4 LT |
1330 | int err, cardnum; |
1331 | ||
1332 | snd_assert(card != NULL, return -ENXIO); | |
1333 | cardnum = card->number; | |
1334 | snd_assert(cardnum >= 0 && cardnum < SNDRV_CARDS, return -ENXIO); | |
1335 | if ((err = snd_unregister_device(SNDRV_DEVICE_TYPE_CONTROL, card, 0)) < 0) | |
1336 | return err; | |
1337 | return snd_ctl_dev_free(device); | |
1338 | } | |
1339 | ||
1340 | /* | |
1341 | * create control core: | |
1342 | * called from init.c | |
1343 | */ | |
82e9bae6 | 1344 | int snd_ctl_create(struct snd_card *card) |
1da177e4 | 1345 | { |
82e9bae6 | 1346 | static struct snd_device_ops ops = { |
1da177e4 LT |
1347 | .dev_free = snd_ctl_dev_free, |
1348 | .dev_register = snd_ctl_dev_register, | |
1349 | .dev_disconnect = snd_ctl_dev_disconnect, | |
1350 | .dev_unregister = snd_ctl_dev_unregister | |
1351 | }; | |
1352 | ||
1353 | snd_assert(card != NULL, return -ENXIO); | |
1354 | return snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops); | |
1355 | } |