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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 | { | |
1da177e4 | 50 | unsigned long flags; |
82e9bae6 TI |
51 | struct snd_card *card; |
52 | struct snd_ctl_file *ctl; | |
1da177e4 LT |
53 | int err; |
54 | ||
f87135f5 | 55 | card = snd_lookup_minor_data(iminor(inode), SNDRV_DEVICE_TYPE_CONTROL); |
1da177e4 LT |
56 | if (!card) { |
57 | err = -ENODEV; | |
58 | goto __error1; | |
59 | } | |
60 | err = snd_card_file_add(card, file); | |
61 | if (err < 0) { | |
62 | err = -ENODEV; | |
63 | goto __error1; | |
64 | } | |
65 | if (!try_module_get(card->module)) { | |
66 | err = -EFAULT; | |
67 | goto __error2; | |
68 | } | |
ca2c0966 | 69 | ctl = kzalloc(sizeof(*ctl), GFP_KERNEL); |
1da177e4 LT |
70 | if (ctl == NULL) { |
71 | err = -ENOMEM; | |
72 | goto __error; | |
73 | } | |
74 | INIT_LIST_HEAD(&ctl->events); | |
75 | init_waitqueue_head(&ctl->change_sleep); | |
76 | spin_lock_init(&ctl->read_lock); | |
77 | ctl->card = card; | |
78 | ctl->pid = current->pid; | |
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 | ||
82e9bae6 | 93 | static void snd_ctl_empty_read_queue(struct snd_ctl_file * ctl) |
1da177e4 | 94 | { |
82e9bae6 | 95 | struct snd_kctl_event *cread; |
1da177e4 LT |
96 | |
97 | spin_lock(&ctl->read_lock); | |
98 | while (!list_empty(&ctl->events)) { | |
99 | cread = snd_kctl_event(ctl->events.next); | |
100 | list_del(&cread->list); | |
101 | kfree(cread); | |
102 | } | |
103 | spin_unlock(&ctl->read_lock); | |
104 | } | |
105 | ||
106 | static int snd_ctl_release(struct inode *inode, struct file *file) | |
107 | { | |
108 | unsigned long flags; | |
109 | struct list_head *list; | |
82e9bae6 TI |
110 | struct snd_card *card; |
111 | struct snd_ctl_file *ctl; | |
112 | struct snd_kcontrol *control; | |
1da177e4 LT |
113 | unsigned int idx; |
114 | ||
115 | ctl = file->private_data; | |
116 | fasync_helper(-1, file, 0, &ctl->fasync); | |
117 | file->private_data = NULL; | |
118 | card = ctl->card; | |
119 | write_lock_irqsave(&card->ctl_files_rwlock, flags); | |
120 | list_del(&ctl->list); | |
121 | write_unlock_irqrestore(&card->ctl_files_rwlock, flags); | |
122 | down_write(&card->controls_rwsem); | |
123 | list_for_each(list, &card->controls) { | |
124 | control = snd_kcontrol(list); | |
125 | for (idx = 0; idx < control->count; idx++) | |
126 | if (control->vd[idx].owner == ctl) | |
127 | control->vd[idx].owner = NULL; | |
128 | } | |
129 | up_write(&card->controls_rwsem); | |
130 | snd_ctl_empty_read_queue(ctl); | |
131 | kfree(ctl); | |
132 | module_put(card->module); | |
133 | snd_card_file_remove(card, file); | |
134 | return 0; | |
135 | } | |
136 | ||
82e9bae6 TI |
137 | void snd_ctl_notify(struct snd_card *card, unsigned int mask, |
138 | struct snd_ctl_elem_id *id) | |
1da177e4 LT |
139 | { |
140 | unsigned long flags; | |
141 | struct list_head *flist; | |
82e9bae6 TI |
142 | struct snd_ctl_file *ctl; |
143 | struct snd_kctl_event *ev; | |
1da177e4 | 144 | |
7c22f1aa | 145 | snd_assert(card != NULL && id != NULL, return); |
1da177e4 LT |
146 | read_lock(&card->ctl_files_rwlock); |
147 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) | |
148 | card->mixer_oss_change_count++; | |
149 | #endif | |
150 | list_for_each(flist, &card->ctl_files) { | |
151 | struct list_head *elist; | |
152 | ctl = snd_ctl_file(flist); | |
153 | if (!ctl->subscribed) | |
154 | continue; | |
155 | spin_lock_irqsave(&ctl->read_lock, flags); | |
156 | list_for_each(elist, &ctl->events) { | |
157 | ev = snd_kctl_event(elist); | |
158 | if (ev->id.numid == id->numid) { | |
159 | ev->mask |= mask; | |
160 | goto _found; | |
161 | } | |
162 | } | |
ca2c0966 | 163 | ev = kzalloc(sizeof(*ev), GFP_ATOMIC); |
1da177e4 LT |
164 | if (ev) { |
165 | ev->id = *id; | |
166 | ev->mask = mask; | |
167 | list_add_tail(&ev->list, &ctl->events); | |
168 | } else { | |
169 | snd_printk(KERN_ERR "No memory available to allocate event\n"); | |
170 | } | |
171 | _found: | |
172 | wake_up(&ctl->change_sleep); | |
173 | spin_unlock_irqrestore(&ctl->read_lock, flags); | |
174 | kill_fasync(&ctl->fasync, SIGIO, POLL_IN); | |
175 | } | |
176 | read_unlock(&card->ctl_files_rwlock); | |
177 | } | |
178 | ||
179 | /** | |
180 | * snd_ctl_new - create a control instance from the template | |
181 | * @control: the control template | |
182 | * @access: the default control access | |
183 | * | |
82e9bae6 | 184 | * Allocates a new struct snd_kcontrol instance and copies the given template |
1da177e4 LT |
185 | * to the new instance. It does not copy volatile data (access). |
186 | * | |
187 | * Returns the pointer of the new instance, or NULL on failure. | |
188 | */ | |
82e9bae6 | 189 | struct snd_kcontrol *snd_ctl_new(struct snd_kcontrol *control, unsigned int access) |
1da177e4 | 190 | { |
82e9bae6 | 191 | struct snd_kcontrol *kctl; |
1da177e4 LT |
192 | unsigned int idx; |
193 | ||
7c22f1aa TI |
194 | snd_assert(control != NULL, return NULL); |
195 | snd_assert(control->count > 0, return NULL); | |
82e9bae6 | 196 | kctl = kzalloc(sizeof(*kctl) + sizeof(struct snd_kcontrol_volatile) * control->count, GFP_KERNEL); |
73e77ba0 TI |
197 | if (kctl == NULL) { |
198 | snd_printk(KERN_ERR "Cannot allocate control instance\n"); | |
1da177e4 | 199 | return NULL; |
73e77ba0 | 200 | } |
1da177e4 LT |
201 | *kctl = *control; |
202 | for (idx = 0; idx < kctl->count; idx++) | |
203 | kctl->vd[idx].access = access; | |
204 | return kctl; | |
205 | } | |
206 | ||
207 | /** | |
208 | * snd_ctl_new1 - create a control instance from the template | |
209 | * @ncontrol: the initialization record | |
210 | * @private_data: the private data to set | |
211 | * | |
82e9bae6 | 212 | * Allocates a new struct snd_kcontrol instance and initialize from the given |
1da177e4 LT |
213 | * template. When the access field of ncontrol is 0, it's assumed as |
214 | * READWRITE access. When the count field is 0, it's assumes as one. | |
215 | * | |
216 | * Returns the pointer of the newly generated instance, or NULL on failure. | |
217 | */ | |
82e9bae6 TI |
218 | struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new *ncontrol, |
219 | void *private_data) | |
1da177e4 | 220 | { |
82e9bae6 | 221 | struct snd_kcontrol kctl; |
1da177e4 LT |
222 | unsigned int access; |
223 | ||
7c22f1aa | 224 | snd_assert(ncontrol != NULL, return NULL); |
1da177e4 LT |
225 | snd_assert(ncontrol->info != NULL, return NULL); |
226 | memset(&kctl, 0, sizeof(kctl)); | |
227 | kctl.id.iface = ncontrol->iface; | |
228 | kctl.id.device = ncontrol->device; | |
229 | kctl.id.subdevice = ncontrol->subdevice; | |
230 | if (ncontrol->name) | |
231 | strlcpy(kctl.id.name, ncontrol->name, sizeof(kctl.id.name)); | |
232 | kctl.id.index = ncontrol->index; | |
233 | kctl.count = ncontrol->count ? ncontrol->count : 1; | |
234 | access = ncontrol->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE : | |
235 | (ncontrol->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|SNDRV_CTL_ELEM_ACCESS_INACTIVE| | |
236 | SNDRV_CTL_ELEM_ACCESS_DINDIRECT|SNDRV_CTL_ELEM_ACCESS_INDIRECT)); | |
237 | kctl.info = ncontrol->info; | |
238 | kctl.get = ncontrol->get; | |
239 | kctl.put = ncontrol->put; | |
240 | kctl.private_value = ncontrol->private_value; | |
241 | kctl.private_data = private_data; | |
242 | return snd_ctl_new(&kctl, access); | |
243 | } | |
244 | ||
245 | /** | |
246 | * snd_ctl_free_one - release the control instance | |
247 | * @kcontrol: the control instance | |
248 | * | |
249 | * Releases the control instance created via snd_ctl_new() | |
250 | * or snd_ctl_new1(). | |
251 | * Don't call this after the control was added to the card. | |
252 | */ | |
82e9bae6 | 253 | void snd_ctl_free_one(struct snd_kcontrol *kcontrol) |
1da177e4 LT |
254 | { |
255 | if (kcontrol) { | |
256 | if (kcontrol->private_free) | |
257 | kcontrol->private_free(kcontrol); | |
258 | kfree(kcontrol); | |
259 | } | |
260 | } | |
261 | ||
82e9bae6 | 262 | static unsigned int snd_ctl_hole_check(struct snd_card *card, |
1da177e4 LT |
263 | unsigned int count) |
264 | { | |
265 | struct list_head *list; | |
82e9bae6 | 266 | struct snd_kcontrol *kctl; |
1da177e4 LT |
267 | |
268 | list_for_each(list, &card->controls) { | |
269 | kctl = snd_kcontrol(list); | |
270 | if ((kctl->id.numid <= card->last_numid && | |
271 | kctl->id.numid + kctl->count > card->last_numid) || | |
272 | (kctl->id.numid <= card->last_numid + count - 1 && | |
273 | kctl->id.numid + kctl->count > card->last_numid + count - 1)) | |
274 | return card->last_numid = kctl->id.numid + kctl->count - 1; | |
275 | } | |
276 | return card->last_numid; | |
277 | } | |
278 | ||
82e9bae6 | 279 | static int snd_ctl_find_hole(struct snd_card *card, unsigned int count) |
1da177e4 LT |
280 | { |
281 | unsigned int last_numid, iter = 100000; | |
282 | ||
283 | last_numid = card->last_numid; | |
284 | while (last_numid != snd_ctl_hole_check(card, count)) { | |
285 | if (--iter == 0) { | |
286 | /* this situation is very unlikely */ | |
287 | snd_printk(KERN_ERR "unable to allocate new control numid\n"); | |
288 | return -ENOMEM; | |
289 | } | |
290 | last_numid = card->last_numid; | |
291 | } | |
292 | return 0; | |
293 | } | |
294 | ||
295 | /** | |
296 | * snd_ctl_add - add the control instance to the card | |
297 | * @card: the card instance | |
298 | * @kcontrol: the control instance to add | |
299 | * | |
300 | * Adds the control instance created via snd_ctl_new() or | |
301 | * snd_ctl_new1() to the given card. Assigns also an unique | |
302 | * numid used for fast search. | |
303 | * | |
304 | * Returns zero if successful, or a negative error code on failure. | |
305 | * | |
306 | * It frees automatically the control which cannot be added. | |
307 | */ | |
82e9bae6 | 308 | int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol) |
1da177e4 | 309 | { |
82e9bae6 | 310 | struct snd_ctl_elem_id id; |
1da177e4 LT |
311 | unsigned int idx; |
312 | ||
73e77ba0 TI |
313 | snd_assert(card != NULL, return -EINVAL); |
314 | if (! kcontrol) | |
315 | return -EINVAL; | |
1da177e4 LT |
316 | snd_assert(kcontrol->info != NULL, return -EINVAL); |
317 | id = kcontrol->id; | |
318 | down_write(&card->controls_rwsem); | |
319 | if (snd_ctl_find_id(card, &id)) { | |
320 | up_write(&card->controls_rwsem); | |
321 | snd_ctl_free_one(kcontrol); | |
322 | snd_printd(KERN_ERR "control %i:%i:%i:%s:%i is already present\n", | |
323 | id.iface, | |
324 | id.device, | |
325 | id.subdevice, | |
326 | id.name, | |
327 | id.index); | |
328 | return -EBUSY; | |
329 | } | |
330 | if (snd_ctl_find_hole(card, kcontrol->count) < 0) { | |
331 | up_write(&card->controls_rwsem); | |
332 | snd_ctl_free_one(kcontrol); | |
333 | return -ENOMEM; | |
334 | } | |
335 | list_add_tail(&kcontrol->list, &card->controls); | |
336 | card->controls_count += kcontrol->count; | |
337 | kcontrol->id.numid = card->last_numid + 1; | |
338 | card->last_numid += kcontrol->count; | |
339 | up_write(&card->controls_rwsem); | |
340 | for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++) | |
341 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id); | |
342 | return 0; | |
343 | } | |
344 | ||
345 | /** | |
346 | * snd_ctl_remove - remove the control from the card and release it | |
347 | * @card: the card instance | |
348 | * @kcontrol: the control instance to remove | |
349 | * | |
350 | * Removes the control from the card and then releases the instance. | |
351 | * You don't need to call snd_ctl_free_one(). You must be in | |
352 | * the write lock - down_write(&card->controls_rwsem). | |
353 | * | |
354 | * Returns 0 if successful, or a negative error code on failure. | |
355 | */ | |
82e9bae6 | 356 | int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol) |
1da177e4 | 357 | { |
82e9bae6 | 358 | struct snd_ctl_elem_id id; |
1da177e4 LT |
359 | unsigned int idx; |
360 | ||
7c22f1aa | 361 | snd_assert(card != NULL && kcontrol != NULL, return -EINVAL); |
1da177e4 LT |
362 | list_del(&kcontrol->list); |
363 | card->controls_count -= kcontrol->count; | |
364 | id = kcontrol->id; | |
365 | for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++) | |
366 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_REMOVE, &id); | |
367 | snd_ctl_free_one(kcontrol); | |
368 | return 0; | |
369 | } | |
370 | ||
371 | /** | |
372 | * snd_ctl_remove_id - remove the control of the given id and release it | |
373 | * @card: the card instance | |
374 | * @id: the control id to remove | |
375 | * | |
376 | * Finds the control instance with the given id, removes it from the | |
377 | * card list and releases it. | |
378 | * | |
379 | * Returns 0 if successful, or a negative error code on failure. | |
380 | */ | |
82e9bae6 | 381 | int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id) |
1da177e4 | 382 | { |
82e9bae6 | 383 | struct snd_kcontrol *kctl; |
1da177e4 LT |
384 | int ret; |
385 | ||
386 | down_write(&card->controls_rwsem); | |
387 | kctl = snd_ctl_find_id(card, id); | |
388 | if (kctl == NULL) { | |
389 | up_write(&card->controls_rwsem); | |
390 | return -ENOENT; | |
391 | } | |
392 | ret = snd_ctl_remove(card, kctl); | |
393 | up_write(&card->controls_rwsem); | |
394 | return ret; | |
395 | } | |
396 | ||
397 | /** | |
398 | * snd_ctl_remove_unlocked_id - remove the unlocked control of the given id and release it | |
399 | * @file: active control handle | |
400 | * @id: the control id to remove | |
401 | * | |
402 | * Finds the control instance with the given id, removes it from the | |
403 | * card list and releases it. | |
404 | * | |
405 | * Returns 0 if successful, or a negative error code on failure. | |
406 | */ | |
82e9bae6 TI |
407 | static int snd_ctl_remove_unlocked_id(struct snd_ctl_file * file, |
408 | struct snd_ctl_elem_id *id) | |
1da177e4 | 409 | { |
82e9bae6 TI |
410 | struct snd_card *card = file->card; |
411 | struct snd_kcontrol *kctl; | |
1da177e4 LT |
412 | int idx, ret; |
413 | ||
414 | down_write(&card->controls_rwsem); | |
415 | kctl = snd_ctl_find_id(card, id); | |
416 | if (kctl == NULL) { | |
417 | up_write(&card->controls_rwsem); | |
418 | return -ENOENT; | |
419 | } | |
420 | for (idx = 0; idx < kctl->count; idx++) | |
421 | if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) { | |
422 | up_write(&card->controls_rwsem); | |
423 | return -EBUSY; | |
424 | } | |
425 | ret = snd_ctl_remove(card, kctl); | |
426 | up_write(&card->controls_rwsem); | |
427 | return ret; | |
428 | } | |
429 | ||
430 | /** | |
431 | * snd_ctl_rename_id - replace the id of a control on the card | |
432 | * @card: the card instance | |
433 | * @src_id: the old id | |
434 | * @dst_id: the new id | |
435 | * | |
436 | * Finds the control with the old id from the card, and replaces the | |
437 | * id with the new one. | |
438 | * | |
439 | * Returns zero if successful, or a negative error code on failure. | |
440 | */ | |
82e9bae6 TI |
441 | int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id, |
442 | struct snd_ctl_elem_id *dst_id) | |
1da177e4 | 443 | { |
82e9bae6 | 444 | struct snd_kcontrol *kctl; |
1da177e4 LT |
445 | |
446 | down_write(&card->controls_rwsem); | |
447 | kctl = snd_ctl_find_id(card, src_id); | |
448 | if (kctl == NULL) { | |
449 | up_write(&card->controls_rwsem); | |
450 | return -ENOENT; | |
451 | } | |
452 | kctl->id = *dst_id; | |
453 | kctl->id.numid = card->last_numid + 1; | |
454 | card->last_numid += kctl->count; | |
455 | up_write(&card->controls_rwsem); | |
456 | return 0; | |
457 | } | |
458 | ||
459 | /** | |
460 | * snd_ctl_find_numid - find the control instance with the given number-id | |
461 | * @card: the card instance | |
462 | * @numid: the number-id to search | |
463 | * | |
464 | * Finds the control instance with the given number-id from the card. | |
465 | * | |
466 | * Returns the pointer of the instance if found, or NULL if not. | |
467 | * | |
468 | * The caller must down card->controls_rwsem before calling this function | |
469 | * (if the race condition can happen). | |
470 | */ | |
82e9bae6 | 471 | struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid) |
1da177e4 LT |
472 | { |
473 | struct list_head *list; | |
82e9bae6 | 474 | struct snd_kcontrol *kctl; |
1da177e4 | 475 | |
7c22f1aa | 476 | snd_assert(card != NULL && numid != 0, return NULL); |
1da177e4 LT |
477 | list_for_each(list, &card->controls) { |
478 | kctl = snd_kcontrol(list); | |
479 | if (kctl->id.numid <= numid && kctl->id.numid + kctl->count > numid) | |
480 | return kctl; | |
481 | } | |
482 | return NULL; | |
483 | } | |
484 | ||
485 | /** | |
486 | * snd_ctl_find_id - find the control instance with the given id | |
487 | * @card: the card instance | |
488 | * @id: the id to search | |
489 | * | |
490 | * Finds the control instance with the given id from the card. | |
491 | * | |
492 | * Returns the pointer of the instance if found, or NULL if not. | |
493 | * | |
494 | * The caller must down card->controls_rwsem before calling this function | |
495 | * (if the race condition can happen). | |
496 | */ | |
82e9bae6 TI |
497 | struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card, |
498 | struct snd_ctl_elem_id *id) | |
1da177e4 LT |
499 | { |
500 | struct list_head *list; | |
82e9bae6 | 501 | struct snd_kcontrol *kctl; |
1da177e4 | 502 | |
7c22f1aa | 503 | snd_assert(card != NULL && id != NULL, return NULL); |
1da177e4 LT |
504 | if (id->numid != 0) |
505 | return snd_ctl_find_numid(card, id->numid); | |
506 | list_for_each(list, &card->controls) { | |
507 | kctl = snd_kcontrol(list); | |
508 | if (kctl->id.iface != id->iface) | |
509 | continue; | |
510 | if (kctl->id.device != id->device) | |
511 | continue; | |
512 | if (kctl->id.subdevice != id->subdevice) | |
513 | continue; | |
514 | if (strncmp(kctl->id.name, id->name, sizeof(kctl->id.name))) | |
515 | continue; | |
516 | if (kctl->id.index > id->index) | |
517 | continue; | |
518 | if (kctl->id.index + kctl->count <= id->index) | |
519 | continue; | |
520 | return kctl; | |
521 | } | |
522 | return NULL; | |
523 | } | |
524 | ||
82e9bae6 | 525 | static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl, |
1da177e4 LT |
526 | unsigned int cmd, void __user *arg) |
527 | { | |
82e9bae6 | 528 | struct snd_ctl_card_info *info; |
1da177e4 | 529 | |
ca2c0966 | 530 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
1da177e4 LT |
531 | if (! info) |
532 | return -ENOMEM; | |
533 | down_read(&snd_ioctl_rwsem); | |
534 | info->card = card->number; | |
535 | strlcpy(info->id, card->id, sizeof(info->id)); | |
536 | strlcpy(info->driver, card->driver, sizeof(info->driver)); | |
537 | strlcpy(info->name, card->shortname, sizeof(info->name)); | |
538 | strlcpy(info->longname, card->longname, sizeof(info->longname)); | |
539 | strlcpy(info->mixername, card->mixername, sizeof(info->mixername)); | |
540 | strlcpy(info->components, card->components, sizeof(info->components)); | |
541 | up_read(&snd_ioctl_rwsem); | |
82e9bae6 | 542 | if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info))) { |
1da177e4 LT |
543 | kfree(info); |
544 | return -EFAULT; | |
545 | } | |
546 | kfree(info); | |
547 | return 0; | |
548 | } | |
549 | ||
82e9bae6 TI |
550 | static int snd_ctl_elem_list(struct snd_card *card, |
551 | struct snd_ctl_elem_list __user *_list) | |
1da177e4 LT |
552 | { |
553 | struct list_head *plist; | |
82e9bae6 TI |
554 | struct snd_ctl_elem_list list; |
555 | struct snd_kcontrol *kctl; | |
556 | struct snd_ctl_elem_id *dst, *id; | |
1da177e4 LT |
557 | unsigned int offset, space, first, jidx; |
558 | ||
559 | if (copy_from_user(&list, _list, sizeof(list))) | |
560 | return -EFAULT; | |
561 | offset = list.offset; | |
562 | space = list.space; | |
563 | first = 0; | |
564 | /* try limit maximum space */ | |
565 | if (space > 16384) | |
566 | return -ENOMEM; | |
567 | if (space > 0) { | |
568 | /* allocate temporary buffer for atomic operation */ | |
82e9bae6 | 569 | dst = vmalloc(space * sizeof(struct snd_ctl_elem_id)); |
1da177e4 LT |
570 | if (dst == NULL) |
571 | return -ENOMEM; | |
572 | down_read(&card->controls_rwsem); | |
573 | list.count = card->controls_count; | |
574 | plist = card->controls.next; | |
575 | while (plist != &card->controls) { | |
576 | if (offset == 0) | |
577 | break; | |
578 | kctl = snd_kcontrol(plist); | |
579 | if (offset < kctl->count) | |
580 | break; | |
581 | offset -= kctl->count; | |
582 | plist = plist->next; | |
583 | } | |
584 | list.used = 0; | |
585 | id = dst; | |
586 | while (space > 0 && plist != &card->controls) { | |
587 | kctl = snd_kcontrol(plist); | |
588 | for (jidx = offset; space > 0 && jidx < kctl->count; jidx++) { | |
589 | snd_ctl_build_ioff(id, kctl, jidx); | |
590 | id++; | |
591 | space--; | |
592 | list.used++; | |
593 | } | |
594 | plist = plist->next; | |
595 | offset = 0; | |
596 | } | |
597 | up_read(&card->controls_rwsem); | |
82e9bae6 TI |
598 | if (list.used > 0 && |
599 | copy_to_user(list.pids, dst, | |
600 | list.used * sizeof(struct snd_ctl_elem_id))) { | |
1da177e4 LT |
601 | vfree(dst); |
602 | return -EFAULT; | |
603 | } | |
604 | vfree(dst); | |
605 | } else { | |
606 | down_read(&card->controls_rwsem); | |
607 | list.count = card->controls_count; | |
608 | up_read(&card->controls_rwsem); | |
609 | } | |
610 | if (copy_to_user(_list, &list, sizeof(list))) | |
611 | return -EFAULT; | |
612 | return 0; | |
613 | } | |
614 | ||
82e9bae6 TI |
615 | static int snd_ctl_elem_info(struct snd_ctl_file *ctl, |
616 | struct snd_ctl_elem_info *info) | |
1da177e4 | 617 | { |
82e9bae6 TI |
618 | struct snd_card *card = ctl->card; |
619 | struct snd_kcontrol *kctl; | |
620 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
621 | unsigned int index_offset; |
622 | int result; | |
623 | ||
624 | down_read(&card->controls_rwsem); | |
625 | kctl = snd_ctl_find_id(card, &info->id); | |
626 | if (kctl == NULL) { | |
627 | up_read(&card->controls_rwsem); | |
628 | return -ENOENT; | |
629 | } | |
630 | #ifdef CONFIG_SND_DEBUG | |
631 | info->access = 0; | |
632 | #endif | |
633 | result = kctl->info(kctl, info); | |
634 | if (result >= 0) { | |
635 | snd_assert(info->access == 0, ); | |
636 | index_offset = snd_ctl_get_ioff(kctl, &info->id); | |
637 | vd = &kctl->vd[index_offset]; | |
638 | snd_ctl_build_ioff(&info->id, kctl, index_offset); | |
639 | info->access = vd->access; | |
640 | if (vd->owner) { | |
641 | info->access |= SNDRV_CTL_ELEM_ACCESS_LOCK; | |
642 | if (vd->owner == ctl) | |
643 | info->access |= SNDRV_CTL_ELEM_ACCESS_OWNER; | |
644 | info->owner = vd->owner_pid; | |
645 | } else { | |
646 | info->owner = -1; | |
647 | } | |
648 | } | |
649 | up_read(&card->controls_rwsem); | |
650 | return result; | |
651 | } | |
652 | ||
82e9bae6 TI |
653 | static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl, |
654 | struct snd_ctl_elem_info __user *_info) | |
1da177e4 | 655 | { |
82e9bae6 | 656 | struct snd_ctl_elem_info info; |
1da177e4 LT |
657 | int result; |
658 | ||
659 | if (copy_from_user(&info, _info, sizeof(info))) | |
660 | return -EFAULT; | |
661 | result = snd_ctl_elem_info(ctl, &info); | |
662 | if (result >= 0) | |
663 | if (copy_to_user(_info, &info, sizeof(info))) | |
664 | return -EFAULT; | |
665 | return result; | |
666 | } | |
667 | ||
82e9bae6 | 668 | int snd_ctl_elem_read(struct snd_card *card, struct snd_ctl_elem_value *control) |
1da177e4 | 669 | { |
82e9bae6 TI |
670 | struct snd_kcontrol *kctl; |
671 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
672 | unsigned int index_offset; |
673 | int result, indirect; | |
674 | ||
675 | down_read(&card->controls_rwsem); | |
676 | kctl = snd_ctl_find_id(card, &control->id); | |
677 | if (kctl == NULL) { | |
678 | result = -ENOENT; | |
679 | } else { | |
680 | index_offset = snd_ctl_get_ioff(kctl, &control->id); | |
681 | vd = &kctl->vd[index_offset]; | |
682 | indirect = vd->access & SNDRV_CTL_ELEM_ACCESS_INDIRECT ? 1 : 0; | |
683 | if (control->indirect != indirect) { | |
684 | result = -EACCES; | |
685 | } else { | |
686 | if ((vd->access & SNDRV_CTL_ELEM_ACCESS_READ) && kctl->get != NULL) { | |
687 | snd_ctl_build_ioff(&control->id, kctl, index_offset); | |
688 | result = kctl->get(kctl, control); | |
689 | } else { | |
690 | result = -EPERM; | |
691 | } | |
692 | } | |
693 | } | |
694 | up_read(&card->controls_rwsem); | |
695 | return result; | |
696 | } | |
697 | ||
82e9bae6 TI |
698 | static int snd_ctl_elem_read_user(struct snd_card *card, |
699 | struct snd_ctl_elem_value __user *_control) | |
1da177e4 | 700 | { |
82e9bae6 | 701 | struct snd_ctl_elem_value *control; |
1da177e4 LT |
702 | int result; |
703 | ||
704 | control = kmalloc(sizeof(*control), GFP_KERNEL); | |
705 | if (control == NULL) | |
706 | return -ENOMEM; | |
707 | if (copy_from_user(control, _control, sizeof(*control))) { | |
708 | kfree(control); | |
709 | return -EFAULT; | |
710 | } | |
711 | result = snd_ctl_elem_read(card, control); | |
712 | if (result >= 0) | |
713 | if (copy_to_user(_control, control, sizeof(*control))) | |
714 | result = -EFAULT; | |
715 | kfree(control); | |
716 | return result; | |
717 | } | |
718 | ||
82e9bae6 TI |
719 | int snd_ctl_elem_write(struct snd_card *card, struct snd_ctl_file *file, |
720 | struct snd_ctl_elem_value *control) | |
1da177e4 | 721 | { |
82e9bae6 TI |
722 | struct snd_kcontrol *kctl; |
723 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
724 | unsigned int index_offset; |
725 | int result, indirect; | |
726 | ||
727 | down_read(&card->controls_rwsem); | |
728 | kctl = snd_ctl_find_id(card, &control->id); | |
729 | if (kctl == NULL) { | |
730 | result = -ENOENT; | |
731 | } else { | |
732 | index_offset = snd_ctl_get_ioff(kctl, &control->id); | |
733 | vd = &kctl->vd[index_offset]; | |
734 | indirect = vd->access & SNDRV_CTL_ELEM_ACCESS_INDIRECT ? 1 : 0; | |
735 | if (control->indirect != indirect) { | |
736 | result = -EACCES; | |
737 | } else { | |
738 | if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_WRITE) || | |
739 | kctl->put == NULL || | |
740 | (file && vd->owner != NULL && vd->owner != file)) { | |
741 | result = -EPERM; | |
742 | } else { | |
743 | snd_ctl_build_ioff(&control->id, kctl, index_offset); | |
744 | result = kctl->put(kctl, control); | |
745 | } | |
746 | if (result > 0) { | |
747 | up_read(&card->controls_rwsem); | |
748 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, &control->id); | |
749 | return 0; | |
750 | } | |
751 | } | |
752 | } | |
753 | up_read(&card->controls_rwsem); | |
754 | return result; | |
755 | } | |
756 | ||
82e9bae6 TI |
757 | static int snd_ctl_elem_write_user(struct snd_ctl_file *file, |
758 | struct snd_ctl_elem_value __user *_control) | |
1da177e4 | 759 | { |
82e9bae6 | 760 | struct snd_ctl_elem_value *control; |
1da177e4 LT |
761 | int result; |
762 | ||
763 | control = kmalloc(sizeof(*control), GFP_KERNEL); | |
764 | if (control == NULL) | |
765 | return -ENOMEM; | |
766 | if (copy_from_user(control, _control, sizeof(*control))) { | |
767 | kfree(control); | |
768 | return -EFAULT; | |
769 | } | |
770 | result = snd_ctl_elem_write(file->card, file, control); | |
771 | if (result >= 0) | |
772 | if (copy_to_user(_control, control, sizeof(*control))) | |
773 | result = -EFAULT; | |
774 | kfree(control); | |
775 | return result; | |
776 | } | |
777 | ||
82e9bae6 TI |
778 | static int snd_ctl_elem_lock(struct snd_ctl_file *file, |
779 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 780 | { |
82e9bae6 TI |
781 | struct snd_card *card = file->card; |
782 | struct snd_ctl_elem_id id; | |
783 | struct snd_kcontrol *kctl; | |
784 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
785 | int result; |
786 | ||
787 | if (copy_from_user(&id, _id, sizeof(id))) | |
788 | return -EFAULT; | |
789 | down_write(&card->controls_rwsem); | |
790 | kctl = snd_ctl_find_id(card, &id); | |
791 | if (kctl == NULL) { | |
792 | result = -ENOENT; | |
793 | } else { | |
794 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; | |
795 | if (vd->owner != NULL) | |
796 | result = -EBUSY; | |
797 | else { | |
798 | vd->owner = file; | |
799 | vd->owner_pid = current->pid; | |
800 | result = 0; | |
801 | } | |
802 | } | |
803 | up_write(&card->controls_rwsem); | |
804 | return result; | |
805 | } | |
806 | ||
82e9bae6 TI |
807 | static int snd_ctl_elem_unlock(struct snd_ctl_file *file, |
808 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 809 | { |
82e9bae6 TI |
810 | struct snd_card *card = file->card; |
811 | struct snd_ctl_elem_id id; | |
812 | struct snd_kcontrol *kctl; | |
813 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
814 | int result; |
815 | ||
816 | if (copy_from_user(&id, _id, sizeof(id))) | |
817 | return -EFAULT; | |
818 | down_write(&card->controls_rwsem); | |
819 | kctl = snd_ctl_find_id(card, &id); | |
820 | if (kctl == NULL) { | |
821 | result = -ENOENT; | |
822 | } else { | |
823 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; | |
824 | if (vd->owner == NULL) | |
825 | result = -EINVAL; | |
826 | else if (vd->owner != file) | |
827 | result = -EPERM; | |
828 | else { | |
829 | vd->owner = NULL; | |
830 | vd->owner_pid = 0; | |
831 | result = 0; | |
832 | } | |
833 | } | |
834 | up_write(&card->controls_rwsem); | |
835 | return result; | |
836 | } | |
837 | ||
838 | struct user_element { | |
82e9bae6 | 839 | struct snd_ctl_elem_info info; |
1da177e4 LT |
840 | void *elem_data; /* element data */ |
841 | unsigned long elem_data_size; /* size of element data in bytes */ | |
842 | void *priv_data; /* private data (like strings for enumerated type) */ | |
843 | unsigned long priv_data_size; /* size of private data in bytes */ | |
844 | }; | |
845 | ||
82e9bae6 TI |
846 | static int snd_ctl_elem_user_info(struct snd_kcontrol *kcontrol, |
847 | struct snd_ctl_elem_info *uinfo) | |
1da177e4 LT |
848 | { |
849 | struct user_element *ue = kcontrol->private_data; | |
850 | ||
851 | *uinfo = ue->info; | |
852 | return 0; | |
853 | } | |
854 | ||
82e9bae6 TI |
855 | static int snd_ctl_elem_user_get(struct snd_kcontrol *kcontrol, |
856 | struct snd_ctl_elem_value *ucontrol) | |
1da177e4 LT |
857 | { |
858 | struct user_element *ue = kcontrol->private_data; | |
859 | ||
860 | memcpy(&ucontrol->value, ue->elem_data, ue->elem_data_size); | |
861 | return 0; | |
862 | } | |
863 | ||
82e9bae6 TI |
864 | static int snd_ctl_elem_user_put(struct snd_kcontrol *kcontrol, |
865 | struct snd_ctl_elem_value *ucontrol) | |
1da177e4 LT |
866 | { |
867 | int change; | |
868 | struct user_element *ue = kcontrol->private_data; | |
869 | ||
870 | change = memcmp(&ucontrol->value, ue->elem_data, ue->elem_data_size) != 0; | |
871 | if (change) | |
872 | memcpy(ue->elem_data, &ucontrol->value, ue->elem_data_size); | |
873 | return change; | |
874 | } | |
875 | ||
82e9bae6 | 876 | static void snd_ctl_elem_user_free(struct snd_kcontrol *kcontrol) |
1da177e4 LT |
877 | { |
878 | kfree(kcontrol->private_data); | |
879 | } | |
880 | ||
82e9bae6 TI |
881 | static int snd_ctl_elem_add(struct snd_ctl_file *file, |
882 | struct snd_ctl_elem_info *info, int replace) | |
1da177e4 | 883 | { |
82e9bae6 TI |
884 | struct snd_card *card = file->card; |
885 | struct snd_kcontrol kctl, *_kctl; | |
1da177e4 LT |
886 | unsigned int access; |
887 | long private_size; | |
888 | struct user_element *ue; | |
889 | int idx, err; | |
890 | ||
891 | if (card->user_ctl_count >= MAX_USER_CONTROLS) | |
892 | return -ENOMEM; | |
893 | if (info->count > 1024) | |
894 | return -EINVAL; | |
895 | access = info->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE : | |
82e9bae6 TI |
896 | (info->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE| |
897 | SNDRV_CTL_ELEM_ACCESS_INACTIVE)); | |
1da177e4 LT |
898 | info->id.numid = 0; |
899 | memset(&kctl, 0, sizeof(kctl)); | |
900 | down_write(&card->controls_rwsem); | |
901 | _kctl = snd_ctl_find_id(card, &info->id); | |
902 | err = 0; | |
903 | if (_kctl) { | |
904 | if (replace) | |
905 | err = snd_ctl_remove(card, _kctl); | |
906 | else | |
907 | err = -EBUSY; | |
908 | } else { | |
909 | if (replace) | |
910 | err = -ENOENT; | |
911 | } | |
912 | up_write(&card->controls_rwsem); | |
913 | if (err < 0) | |
914 | return err; | |
915 | memcpy(&kctl.id, &info->id, sizeof(info->id)); | |
916 | kctl.count = info->owner ? info->owner : 1; | |
917 | access |= SNDRV_CTL_ELEM_ACCESS_USER; | |
918 | kctl.info = snd_ctl_elem_user_info; | |
919 | if (access & SNDRV_CTL_ELEM_ACCESS_READ) | |
920 | kctl.get = snd_ctl_elem_user_get; | |
921 | if (access & SNDRV_CTL_ELEM_ACCESS_WRITE) | |
922 | kctl.put = snd_ctl_elem_user_put; | |
923 | switch (info->type) { | |
924 | case SNDRV_CTL_ELEM_TYPE_BOOLEAN: | |
925 | private_size = sizeof(char); | |
926 | if (info->count > 128) | |
927 | return -EINVAL; | |
928 | break; | |
929 | case SNDRV_CTL_ELEM_TYPE_INTEGER: | |
930 | private_size = sizeof(long); | |
931 | if (info->count > 128) | |
932 | return -EINVAL; | |
933 | break; | |
934 | case SNDRV_CTL_ELEM_TYPE_INTEGER64: | |
935 | private_size = sizeof(long long); | |
936 | if (info->count > 64) | |
937 | return -EINVAL; | |
938 | break; | |
939 | case SNDRV_CTL_ELEM_TYPE_BYTES: | |
940 | private_size = sizeof(unsigned char); | |
941 | if (info->count > 512) | |
942 | return -EINVAL; | |
943 | break; | |
944 | case SNDRV_CTL_ELEM_TYPE_IEC958: | |
82e9bae6 | 945 | private_size = sizeof(struct snd_aes_iec958); |
1da177e4 LT |
946 | if (info->count != 1) |
947 | return -EINVAL; | |
948 | break; | |
949 | default: | |
950 | return -EINVAL; | |
951 | } | |
952 | private_size *= info->count; | |
ca2c0966 | 953 | ue = kzalloc(sizeof(struct user_element) + private_size, GFP_KERNEL); |
1da177e4 LT |
954 | if (ue == NULL) |
955 | return -ENOMEM; | |
956 | ue->info = *info; | |
957 | ue->elem_data = (char *)ue + sizeof(*ue); | |
958 | ue->elem_data_size = private_size; | |
959 | kctl.private_free = snd_ctl_elem_user_free; | |
960 | _kctl = snd_ctl_new(&kctl, access); | |
961 | if (_kctl == NULL) { | |
962 | kfree(_kctl->private_data); | |
963 | return -ENOMEM; | |
964 | } | |
965 | _kctl->private_data = ue; | |
966 | for (idx = 0; idx < _kctl->count; idx++) | |
967 | _kctl->vd[idx].owner = file; | |
968 | err = snd_ctl_add(card, _kctl); | |
969 | if (err < 0) { | |
970 | snd_ctl_free_one(_kctl); | |
971 | return err; | |
972 | } | |
973 | ||
974 | down_write(&card->controls_rwsem); | |
975 | card->user_ctl_count++; | |
976 | up_write(&card->controls_rwsem); | |
977 | ||
978 | return 0; | |
979 | } | |
980 | ||
82e9bae6 TI |
981 | static int snd_ctl_elem_add_user(struct snd_ctl_file *file, |
982 | struct snd_ctl_elem_info __user *_info, int replace) | |
1da177e4 | 983 | { |
82e9bae6 | 984 | struct snd_ctl_elem_info info; |
1da177e4 LT |
985 | if (copy_from_user(&info, _info, sizeof(info))) |
986 | return -EFAULT; | |
987 | return snd_ctl_elem_add(file, &info, replace); | |
988 | } | |
989 | ||
82e9bae6 TI |
990 | static int snd_ctl_elem_remove(struct snd_ctl_file *file, |
991 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 992 | { |
82e9bae6 | 993 | struct snd_ctl_elem_id id; |
1da177e4 LT |
994 | int err; |
995 | ||
996 | if (copy_from_user(&id, _id, sizeof(id))) | |
997 | return -EFAULT; | |
998 | err = snd_ctl_remove_unlocked_id(file, &id); | |
999 | if (! err) { | |
82e9bae6 | 1000 | struct snd_card *card = file->card; |
1da177e4 LT |
1001 | down_write(&card->controls_rwsem); |
1002 | card->user_ctl_count--; | |
1003 | up_write(&card->controls_rwsem); | |
1004 | } | |
1005 | return err; | |
1006 | } | |
1007 | ||
82e9bae6 | 1008 | static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr) |
1da177e4 LT |
1009 | { |
1010 | int subscribe; | |
1011 | if (get_user(subscribe, ptr)) | |
1012 | return -EFAULT; | |
1013 | if (subscribe < 0) { | |
1014 | subscribe = file->subscribed; | |
1015 | if (put_user(subscribe, ptr)) | |
1016 | return -EFAULT; | |
1017 | return 0; | |
1018 | } | |
1019 | if (subscribe) { | |
1020 | file->subscribed = 1; | |
1021 | return 0; | |
1022 | } else if (file->subscribed) { | |
1023 | snd_ctl_empty_read_queue(file); | |
1024 | file->subscribed = 0; | |
1025 | } | |
1026 | return 0; | |
1027 | } | |
1028 | ||
1da177e4 LT |
1029 | static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1030 | { | |
82e9bae6 TI |
1031 | struct snd_ctl_file *ctl; |
1032 | struct snd_card *card; | |
1da177e4 | 1033 | struct list_head *list; |
82e9bae6 | 1034 | struct snd_kctl_ioctl *p; |
1da177e4 LT |
1035 | void __user *argp = (void __user *)arg; |
1036 | int __user *ip = argp; | |
1037 | int err; | |
1038 | ||
1039 | ctl = file->private_data; | |
1040 | card = ctl->card; | |
1041 | snd_assert(card != NULL, return -ENXIO); | |
1042 | switch (cmd) { | |
1043 | case SNDRV_CTL_IOCTL_PVERSION: | |
1044 | return put_user(SNDRV_CTL_VERSION, ip) ? -EFAULT : 0; | |
1045 | case SNDRV_CTL_IOCTL_CARD_INFO: | |
1046 | return snd_ctl_card_info(card, ctl, cmd, argp); | |
1047 | case SNDRV_CTL_IOCTL_ELEM_LIST: | |
1048 | return snd_ctl_elem_list(ctl->card, argp); | |
1049 | case SNDRV_CTL_IOCTL_ELEM_INFO: | |
1050 | return snd_ctl_elem_info_user(ctl, argp); | |
1051 | case SNDRV_CTL_IOCTL_ELEM_READ: | |
1052 | return snd_ctl_elem_read_user(ctl->card, argp); | |
1053 | case SNDRV_CTL_IOCTL_ELEM_WRITE: | |
1054 | return snd_ctl_elem_write_user(ctl, argp); | |
1055 | case SNDRV_CTL_IOCTL_ELEM_LOCK: | |
1056 | return snd_ctl_elem_lock(ctl, argp); | |
1057 | case SNDRV_CTL_IOCTL_ELEM_UNLOCK: | |
1058 | return snd_ctl_elem_unlock(ctl, argp); | |
1059 | case SNDRV_CTL_IOCTL_ELEM_ADD: | |
1060 | return snd_ctl_elem_add_user(ctl, argp, 0); | |
1061 | case SNDRV_CTL_IOCTL_ELEM_REPLACE: | |
1062 | return snd_ctl_elem_add_user(ctl, argp, 1); | |
1063 | case SNDRV_CTL_IOCTL_ELEM_REMOVE: | |
1064 | return snd_ctl_elem_remove(ctl, argp); | |
1065 | case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS: | |
1066 | return snd_ctl_subscribe_events(ctl, ip); | |
1067 | case SNDRV_CTL_IOCTL_POWER: | |
a381a7a6 | 1068 | return -ENOPROTOOPT; |
1da177e4 LT |
1069 | case SNDRV_CTL_IOCTL_POWER_STATE: |
1070 | #ifdef CONFIG_PM | |
1071 | return put_user(card->power_state, ip) ? -EFAULT : 0; | |
1072 | #else | |
1073 | return put_user(SNDRV_CTL_POWER_D0, ip) ? -EFAULT : 0; | |
1074 | #endif | |
1075 | } | |
1076 | down_read(&snd_ioctl_rwsem); | |
1077 | list_for_each(list, &snd_control_ioctls) { | |
82e9bae6 | 1078 | p = list_entry(list, struct snd_kctl_ioctl, list); |
1da177e4 LT |
1079 | err = p->fioctl(card, ctl, cmd, arg); |
1080 | if (err != -ENOIOCTLCMD) { | |
1081 | up_read(&snd_ioctl_rwsem); | |
1082 | return err; | |
1083 | } | |
1084 | } | |
1085 | up_read(&snd_ioctl_rwsem); | |
6d85be61 | 1086 | snd_printdd("unknown ioctl = 0x%x\n", cmd); |
1da177e4 LT |
1087 | return -ENOTTY; |
1088 | } | |
1089 | ||
82e9bae6 TI |
1090 | static ssize_t snd_ctl_read(struct file *file, char __user *buffer, |
1091 | size_t count, loff_t * offset) | |
1da177e4 | 1092 | { |
82e9bae6 | 1093 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1094 | int err = 0; |
1095 | ssize_t result = 0; | |
1096 | ||
1097 | ctl = file->private_data; | |
1098 | snd_assert(ctl != NULL && ctl->card != NULL, return -ENXIO); | |
1099 | if (!ctl->subscribed) | |
1100 | return -EBADFD; | |
82e9bae6 | 1101 | if (count < sizeof(struct snd_ctl_event)) |
1da177e4 LT |
1102 | return -EINVAL; |
1103 | spin_lock_irq(&ctl->read_lock); | |
82e9bae6 TI |
1104 | while (count >= sizeof(struct snd_ctl_event)) { |
1105 | struct snd_ctl_event ev; | |
1106 | struct snd_kctl_event *kev; | |
1da177e4 LT |
1107 | while (list_empty(&ctl->events)) { |
1108 | wait_queue_t wait; | |
1109 | if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { | |
1110 | err = -EAGAIN; | |
1111 | goto __end_lock; | |
1112 | } | |
1113 | init_waitqueue_entry(&wait, current); | |
1114 | add_wait_queue(&ctl->change_sleep, &wait); | |
1115 | set_current_state(TASK_INTERRUPTIBLE); | |
1116 | spin_unlock_irq(&ctl->read_lock); | |
1117 | schedule(); | |
1118 | remove_wait_queue(&ctl->change_sleep, &wait); | |
1119 | if (signal_pending(current)) | |
1120 | return result > 0 ? result : -ERESTARTSYS; | |
1121 | spin_lock_irq(&ctl->read_lock); | |
1122 | } | |
1123 | kev = snd_kctl_event(ctl->events.next); | |
1124 | ev.type = SNDRV_CTL_EVENT_ELEM; | |
1125 | ev.data.elem.mask = kev->mask; | |
1126 | ev.data.elem.id = kev->id; | |
1127 | list_del(&kev->list); | |
1128 | spin_unlock_irq(&ctl->read_lock); | |
1129 | kfree(kev); | |
82e9bae6 | 1130 | if (copy_to_user(buffer, &ev, sizeof(struct snd_ctl_event))) { |
1da177e4 LT |
1131 | err = -EFAULT; |
1132 | goto __end; | |
1133 | } | |
1134 | spin_lock_irq(&ctl->read_lock); | |
82e9bae6 TI |
1135 | buffer += sizeof(struct snd_ctl_event); |
1136 | count -= sizeof(struct snd_ctl_event); | |
1137 | result += sizeof(struct snd_ctl_event); | |
1da177e4 LT |
1138 | } |
1139 | __end_lock: | |
1140 | spin_unlock_irq(&ctl->read_lock); | |
1141 | __end: | |
1142 | return result > 0 ? result : err; | |
1143 | } | |
1144 | ||
1145 | static unsigned int snd_ctl_poll(struct file *file, poll_table * wait) | |
1146 | { | |
1147 | unsigned int mask; | |
82e9bae6 | 1148 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1149 | |
1150 | ctl = file->private_data; | |
1151 | if (!ctl->subscribed) | |
1152 | return 0; | |
1153 | poll_wait(file, &ctl->change_sleep, wait); | |
1154 | ||
1155 | mask = 0; | |
1156 | if (!list_empty(&ctl->events)) | |
1157 | mask |= POLLIN | POLLRDNORM; | |
1158 | ||
1159 | return mask; | |
1160 | } | |
1161 | ||
1162 | /* | |
1163 | * register the device-specific control-ioctls. | |
1164 | * called from each device manager like pcm.c, hwdep.c, etc. | |
1165 | */ | |
1166 | static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists) | |
1167 | { | |
82e9bae6 | 1168 | struct snd_kctl_ioctl *pn; |
1da177e4 | 1169 | |
82e9bae6 | 1170 | pn = kzalloc(sizeof(struct snd_kctl_ioctl), GFP_KERNEL); |
1da177e4 LT |
1171 | if (pn == NULL) |
1172 | return -ENOMEM; | |
1173 | pn->fioctl = fcn; | |
1174 | down_write(&snd_ioctl_rwsem); | |
1175 | list_add_tail(&pn->list, lists); | |
1176 | up_write(&snd_ioctl_rwsem); | |
1177 | return 0; | |
1178 | } | |
1179 | ||
1180 | int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn) | |
1181 | { | |
1182 | return _snd_ctl_register_ioctl(fcn, &snd_control_ioctls); | |
1183 | } | |
1184 | ||
1185 | #ifdef CONFIG_COMPAT | |
1186 | int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn) | |
1187 | { | |
1188 | return _snd_ctl_register_ioctl(fcn, &snd_control_compat_ioctls); | |
1189 | } | |
1190 | #endif | |
1191 | ||
1192 | /* | |
1193 | * de-register the device-specific control-ioctls. | |
1194 | */ | |
82e9bae6 TI |
1195 | static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn, |
1196 | struct list_head *lists) | |
1da177e4 LT |
1197 | { |
1198 | struct list_head *list; | |
82e9bae6 | 1199 | struct snd_kctl_ioctl *p; |
1da177e4 | 1200 | |
7c22f1aa | 1201 | snd_assert(fcn != NULL, return -EINVAL); |
1da177e4 LT |
1202 | down_write(&snd_ioctl_rwsem); |
1203 | list_for_each(list, lists) { | |
82e9bae6 | 1204 | p = list_entry(list, struct snd_kctl_ioctl, list); |
1da177e4 LT |
1205 | if (p->fioctl == fcn) { |
1206 | list_del(&p->list); | |
1207 | up_write(&snd_ioctl_rwsem); | |
1208 | kfree(p); | |
1209 | return 0; | |
1210 | } | |
1211 | } | |
1212 | up_write(&snd_ioctl_rwsem); | |
1213 | snd_BUG(); | |
1214 | return -EINVAL; | |
1215 | } | |
1216 | ||
1217 | int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn) | |
1218 | { | |
1219 | return _snd_ctl_unregister_ioctl(fcn, &snd_control_ioctls); | |
1220 | } | |
1221 | ||
1222 | #ifdef CONFIG_COMPAT | |
1223 | int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn) | |
1224 | { | |
1225 | return _snd_ctl_unregister_ioctl(fcn, &snd_control_compat_ioctls); | |
1226 | } | |
1227 | ||
1228 | #endif | |
1229 | ||
1230 | static int snd_ctl_fasync(int fd, struct file * file, int on) | |
1231 | { | |
82e9bae6 | 1232 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1233 | int err; |
1234 | ctl = file->private_data; | |
1235 | err = fasync_helper(fd, file, on, &ctl->fasync); | |
1236 | if (err < 0) | |
1237 | return err; | |
1238 | return 0; | |
1239 | } | |
1240 | ||
1241 | /* | |
1242 | * ioctl32 compat | |
1243 | */ | |
1244 | #ifdef CONFIG_COMPAT | |
1245 | #include "control_compat.c" | |
1246 | #else | |
1247 | #define snd_ctl_ioctl_compat NULL | |
1248 | #endif | |
1249 | ||
1250 | /* | |
1251 | * INIT PART | |
1252 | */ | |
1253 | ||
1254 | static struct file_operations snd_ctl_f_ops = | |
1255 | { | |
1256 | .owner = THIS_MODULE, | |
1257 | .read = snd_ctl_read, | |
1258 | .open = snd_ctl_open, | |
1259 | .release = snd_ctl_release, | |
1260 | .poll = snd_ctl_poll, | |
1261 | .unlocked_ioctl = snd_ctl_ioctl, | |
1262 | .compat_ioctl = snd_ctl_ioctl_compat, | |
1263 | .fasync = snd_ctl_fasync, | |
1264 | }; | |
1265 | ||
1da177e4 LT |
1266 | /* |
1267 | * registration of the control device | |
1268 | */ | |
82e9bae6 | 1269 | static int snd_ctl_dev_register(struct snd_device *device) |
1da177e4 | 1270 | { |
82e9bae6 | 1271 | struct snd_card *card = device->device_data; |
1da177e4 LT |
1272 | int err, cardnum; |
1273 | char name[16]; | |
1274 | ||
1275 | snd_assert(card != NULL, return -ENXIO); | |
1276 | cardnum = card->number; | |
1277 | snd_assert(cardnum >= 0 && cardnum < SNDRV_CARDS, return -ENXIO); | |
1278 | sprintf(name, "controlC%i", cardnum); | |
f87135f5 CL |
1279 | if ((err = snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1, |
1280 | &snd_ctl_f_ops, card, name)) < 0) | |
1da177e4 LT |
1281 | return err; |
1282 | return 0; | |
1283 | } | |
1284 | ||
1285 | /* | |
1286 | * disconnection of the control device | |
1287 | */ | |
82e9bae6 | 1288 | static int snd_ctl_dev_disconnect(struct snd_device *device) |
1da177e4 | 1289 | { |
82e9bae6 | 1290 | struct snd_card *card = device->device_data; |
1da177e4 | 1291 | struct list_head *flist; |
82e9bae6 | 1292 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1293 | |
1294 | down_read(&card->controls_rwsem); | |
1295 | list_for_each(flist, &card->ctl_files) { | |
1296 | ctl = snd_ctl_file(flist); | |
1297 | wake_up(&ctl->change_sleep); | |
1298 | kill_fasync(&ctl->fasync, SIGIO, POLL_ERR); | |
1299 | } | |
1300 | up_read(&card->controls_rwsem); | |
1301 | return 0; | |
1302 | } | |
1303 | ||
1304 | /* | |
1305 | * free all controls | |
1306 | */ | |
82e9bae6 | 1307 | static int snd_ctl_dev_free(struct snd_device *device) |
1da177e4 | 1308 | { |
82e9bae6 TI |
1309 | struct snd_card *card = device->device_data; |
1310 | struct snd_kcontrol *control; | |
1da177e4 LT |
1311 | |
1312 | down_write(&card->controls_rwsem); | |
1313 | while (!list_empty(&card->controls)) { | |
1314 | control = snd_kcontrol(card->controls.next); | |
1315 | snd_ctl_remove(card, control); | |
1316 | } | |
1317 | up_write(&card->controls_rwsem); | |
1318 | return 0; | |
1319 | } | |
1320 | ||
1321 | /* | |
1322 | * de-registration of the control device | |
1323 | */ | |
82e9bae6 | 1324 | static int snd_ctl_dev_unregister(struct snd_device *device) |
1da177e4 | 1325 | { |
82e9bae6 | 1326 | struct snd_card *card = device->device_data; |
1da177e4 LT |
1327 | int err, cardnum; |
1328 | ||
1329 | snd_assert(card != NULL, return -ENXIO); | |
1330 | cardnum = card->number; | |
1331 | snd_assert(cardnum >= 0 && cardnum < SNDRV_CARDS, return -ENXIO); | |
2af677fc CL |
1332 | if ((err = snd_unregister_device(SNDRV_DEVICE_TYPE_CONTROL, |
1333 | card, -1)) < 0) | |
1da177e4 LT |
1334 | return err; |
1335 | return snd_ctl_dev_free(device); | |
1336 | } | |
1337 | ||
1338 | /* | |
1339 | * create control core: | |
1340 | * called from init.c | |
1341 | */ | |
82e9bae6 | 1342 | int snd_ctl_create(struct snd_card *card) |
1da177e4 | 1343 | { |
82e9bae6 | 1344 | static struct snd_device_ops ops = { |
1da177e4 LT |
1345 | .dev_free = snd_ctl_dev_free, |
1346 | .dev_register = snd_ctl_dev_register, | |
1347 | .dev_disconnect = snd_ctl_dev_disconnect, | |
1348 | .dev_unregister = snd_ctl_dev_unregister | |
1349 | }; | |
1350 | ||
1351 | snd_assert(card != NULL, return -ENXIO); | |
1352 | return snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops); | |
1353 | } |