Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Routines for driver control interface | |
c1017a4c | 3 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
1da177e4 LT |
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 | ||
1da177e4 LT |
22 | #include <linux/threads.h> |
23 | #include <linux/interrupt.h> | |
da155d5b | 24 | #include <linux/module.h> |
1da177e4 LT |
25 | #include <linux/slab.h> |
26 | #include <linux/vmalloc.h> | |
27 | #include <linux/time.h> | |
28 | #include <sound/core.h> | |
29 | #include <sound/minors.h> | |
30 | #include <sound/info.h> | |
31 | #include <sound/control.h> | |
32 | ||
33 | /* max number of user-defined controls */ | |
34 | #define MAX_USER_CONTROLS 32 | |
5591bf07 | 35 | #define MAX_CONTROL_COUNT 1028 |
1da177e4 | 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 | ||
02f4865f TI |
55 | err = nonseekable_open(inode, file); |
56 | if (err < 0) | |
57 | return err; | |
58 | ||
f87135f5 | 59 | card = snd_lookup_minor_data(iminor(inode), SNDRV_DEVICE_TYPE_CONTROL); |
1da177e4 LT |
60 | if (!card) { |
61 | err = -ENODEV; | |
62 | goto __error1; | |
63 | } | |
64 | err = snd_card_file_add(card, file); | |
65 | if (err < 0) { | |
66 | err = -ENODEV; | |
67 | goto __error1; | |
68 | } | |
69 | if (!try_module_get(card->module)) { | |
70 | err = -EFAULT; | |
71 | goto __error2; | |
72 | } | |
ca2c0966 | 73 | ctl = kzalloc(sizeof(*ctl), GFP_KERNEL); |
1da177e4 LT |
74 | if (ctl == NULL) { |
75 | err = -ENOMEM; | |
76 | goto __error; | |
77 | } | |
78 | INIT_LIST_HEAD(&ctl->events); | |
79 | init_waitqueue_head(&ctl->change_sleep); | |
80 | spin_lock_init(&ctl->read_lock); | |
81 | ctl->card = card; | |
2529bba7 TI |
82 | ctl->prefer_pcm_subdevice = -1; |
83 | ctl->prefer_rawmidi_subdevice = -1; | |
25d27ede | 84 | ctl->pid = get_pid(task_pid(current)); |
1da177e4 LT |
85 | file->private_data = ctl; |
86 | write_lock_irqsave(&card->ctl_files_rwlock, flags); | |
87 | list_add_tail(&ctl->list, &card->ctl_files); | |
88 | write_unlock_irqrestore(&card->ctl_files_rwlock, flags); | |
a0830dbd | 89 | snd_card_unref(card); |
1da177e4 LT |
90 | return 0; |
91 | ||
92 | __error: | |
93 | module_put(card->module); | |
94 | __error2: | |
95 | snd_card_file_remove(card, file); | |
96 | __error1: | |
a0830dbd TI |
97 | if (card) |
98 | snd_card_unref(card); | |
1da177e4 LT |
99 | return err; |
100 | } | |
101 | ||
82e9bae6 | 102 | static void snd_ctl_empty_read_queue(struct snd_ctl_file * ctl) |
1da177e4 | 103 | { |
7507e8da | 104 | unsigned long flags; |
82e9bae6 | 105 | struct snd_kctl_event *cread; |
1da177e4 | 106 | |
7507e8da | 107 | spin_lock_irqsave(&ctl->read_lock, flags); |
1da177e4 LT |
108 | while (!list_empty(&ctl->events)) { |
109 | cread = snd_kctl_event(ctl->events.next); | |
110 | list_del(&cread->list); | |
111 | kfree(cread); | |
112 | } | |
7507e8da | 113 | spin_unlock_irqrestore(&ctl->read_lock, flags); |
1da177e4 LT |
114 | } |
115 | ||
116 | static int snd_ctl_release(struct inode *inode, struct file *file) | |
117 | { | |
118 | unsigned long flags; | |
82e9bae6 TI |
119 | struct snd_card *card; |
120 | struct snd_ctl_file *ctl; | |
121 | struct snd_kcontrol *control; | |
1da177e4 LT |
122 | unsigned int idx; |
123 | ||
124 | ctl = file->private_data; | |
1da177e4 LT |
125 | file->private_data = NULL; |
126 | card = ctl->card; | |
127 | write_lock_irqsave(&card->ctl_files_rwlock, flags); | |
128 | list_del(&ctl->list); | |
129 | write_unlock_irqrestore(&card->ctl_files_rwlock, flags); | |
130 | down_write(&card->controls_rwsem); | |
9244b2c3 | 131 | list_for_each_entry(control, &card->controls, list) |
1da177e4 LT |
132 | for (idx = 0; idx < control->count; idx++) |
133 | if (control->vd[idx].owner == ctl) | |
134 | control->vd[idx].owner = NULL; | |
1da177e4 LT |
135 | up_write(&card->controls_rwsem); |
136 | snd_ctl_empty_read_queue(ctl); | |
25d27ede | 137 | put_pid(ctl->pid); |
1da177e4 LT |
138 | kfree(ctl); |
139 | module_put(card->module); | |
140 | snd_card_file_remove(card, file); | |
141 | return 0; | |
142 | } | |
143 | ||
82e9bae6 TI |
144 | void snd_ctl_notify(struct snd_card *card, unsigned int mask, |
145 | struct snd_ctl_elem_id *id) | |
1da177e4 LT |
146 | { |
147 | unsigned long flags; | |
82e9bae6 TI |
148 | struct snd_ctl_file *ctl; |
149 | struct snd_kctl_event *ev; | |
1da177e4 | 150 | |
7eaa943c TI |
151 | if (snd_BUG_ON(!card || !id)) |
152 | return; | |
1da177e4 LT |
153 | read_lock(&card->ctl_files_rwlock); |
154 | #if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE) | |
155 | card->mixer_oss_change_count++; | |
156 | #endif | |
9244b2c3 | 157 | list_for_each_entry(ctl, &card->ctl_files, list) { |
1da177e4 LT |
158 | if (!ctl->subscribed) |
159 | continue; | |
160 | spin_lock_irqsave(&ctl->read_lock, flags); | |
9244b2c3 | 161 | list_for_each_entry(ev, &ctl->events, list) { |
1da177e4 LT |
162 | if (ev->id.numid == id->numid) { |
163 | ev->mask |= mask; | |
164 | goto _found; | |
165 | } | |
166 | } | |
ca2c0966 | 167 | ev = kzalloc(sizeof(*ev), GFP_ATOMIC); |
1da177e4 LT |
168 | if (ev) { |
169 | ev->id = *id; | |
170 | ev->mask = mask; | |
171 | list_add_tail(&ev->list, &ctl->events); | |
172 | } else { | |
173 | snd_printk(KERN_ERR "No memory available to allocate event\n"); | |
174 | } | |
175 | _found: | |
176 | wake_up(&ctl->change_sleep); | |
177 | spin_unlock_irqrestore(&ctl->read_lock, flags); | |
178 | kill_fasync(&ctl->fasync, SIGIO, POLL_IN); | |
179 | } | |
180 | read_unlock(&card->ctl_files_rwlock); | |
181 | } | |
182 | ||
c0d3fb39 TI |
183 | EXPORT_SYMBOL(snd_ctl_notify); |
184 | ||
1da177e4 LT |
185 | /** |
186 | * snd_ctl_new - create a control instance from the template | |
187 | * @control: the control template | |
188 | * @access: the default control access | |
189 | * | |
82e9bae6 | 190 | * Allocates a new struct snd_kcontrol instance and copies the given template |
1da177e4 LT |
191 | * to the new instance. It does not copy volatile data (access). |
192 | * | |
eb7c06e8 | 193 | * Return: The pointer of the new instance, or %NULL on failure. |
1da177e4 | 194 | */ |
0b51ba07 AB |
195 | static struct snd_kcontrol *snd_ctl_new(struct snd_kcontrol *control, |
196 | unsigned int access) | |
1da177e4 | 197 | { |
82e9bae6 | 198 | struct snd_kcontrol *kctl; |
1da177e4 LT |
199 | unsigned int idx; |
200 | ||
7eaa943c TI |
201 | if (snd_BUG_ON(!control || !control->count)) |
202 | return NULL; | |
5591bf07 DR |
203 | |
204 | if (control->count > MAX_CONTROL_COUNT) | |
205 | return NULL; | |
206 | ||
82e9bae6 | 207 | kctl = kzalloc(sizeof(*kctl) + sizeof(struct snd_kcontrol_volatile) * control->count, GFP_KERNEL); |
73e77ba0 TI |
208 | if (kctl == NULL) { |
209 | snd_printk(KERN_ERR "Cannot allocate control instance\n"); | |
1da177e4 | 210 | return NULL; |
73e77ba0 | 211 | } |
1da177e4 LT |
212 | *kctl = *control; |
213 | for (idx = 0; idx < kctl->count; idx++) | |
214 | kctl->vd[idx].access = access; | |
215 | return kctl; | |
216 | } | |
217 | ||
218 | /** | |
219 | * snd_ctl_new1 - create a control instance from the template | |
220 | * @ncontrol: the initialization record | |
221 | * @private_data: the private data to set | |
222 | * | |
82e9bae6 | 223 | * Allocates a new struct snd_kcontrol instance and initialize from the given |
1da177e4 LT |
224 | * template. When the access field of ncontrol is 0, it's assumed as |
225 | * READWRITE access. When the count field is 0, it's assumes as one. | |
226 | * | |
eb7c06e8 | 227 | * Return: The pointer of the newly generated instance, or %NULL on failure. |
1da177e4 | 228 | */ |
82e9bae6 TI |
229 | struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new *ncontrol, |
230 | void *private_data) | |
1da177e4 | 231 | { |
82e9bae6 | 232 | struct snd_kcontrol kctl; |
1da177e4 LT |
233 | unsigned int access; |
234 | ||
7eaa943c TI |
235 | if (snd_BUG_ON(!ncontrol || !ncontrol->info)) |
236 | return NULL; | |
1da177e4 LT |
237 | memset(&kctl, 0, sizeof(kctl)); |
238 | kctl.id.iface = ncontrol->iface; | |
239 | kctl.id.device = ncontrol->device; | |
240 | kctl.id.subdevice = ncontrol->subdevice; | |
366840d7 | 241 | if (ncontrol->name) { |
1da177e4 | 242 | strlcpy(kctl.id.name, ncontrol->name, sizeof(kctl.id.name)); |
366840d7 MB |
243 | if (strcmp(ncontrol->name, kctl.id.name) != 0) |
244 | snd_printk(KERN_WARNING | |
245 | "Control name '%s' truncated to '%s'\n", | |
246 | ncontrol->name, kctl.id.name); | |
247 | } | |
1da177e4 LT |
248 | kctl.id.index = ncontrol->index; |
249 | kctl.count = ncontrol->count ? ncontrol->count : 1; | |
250 | access = ncontrol->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE : | |
8aa9b586 | 251 | (ncontrol->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE| |
a8d372f1 | 252 | SNDRV_CTL_ELEM_ACCESS_VOLATILE| |
8aa9b586 | 253 | SNDRV_CTL_ELEM_ACCESS_INACTIVE| |
a75d7a4c CL |
254 | SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE| |
255 | SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND| | |
256 | SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK)); | |
1da177e4 LT |
257 | kctl.info = ncontrol->info; |
258 | kctl.get = ncontrol->get; | |
259 | kctl.put = ncontrol->put; | |
8aa9b586 | 260 | kctl.tlv.p = ncontrol->tlv.p; |
1da177e4 LT |
261 | kctl.private_value = ncontrol->private_value; |
262 | kctl.private_data = private_data; | |
263 | return snd_ctl_new(&kctl, access); | |
264 | } | |
265 | ||
c0d3fb39 TI |
266 | EXPORT_SYMBOL(snd_ctl_new1); |
267 | ||
1da177e4 LT |
268 | /** |
269 | * snd_ctl_free_one - release the control instance | |
270 | * @kcontrol: the control instance | |
271 | * | |
272 | * Releases the control instance created via snd_ctl_new() | |
273 | * or snd_ctl_new1(). | |
274 | * Don't call this after the control was added to the card. | |
275 | */ | |
82e9bae6 | 276 | void snd_ctl_free_one(struct snd_kcontrol *kcontrol) |
1da177e4 LT |
277 | { |
278 | if (kcontrol) { | |
279 | if (kcontrol->private_free) | |
280 | kcontrol->private_free(kcontrol); | |
281 | kfree(kcontrol); | |
282 | } | |
283 | } | |
284 | ||
c0d3fb39 TI |
285 | EXPORT_SYMBOL(snd_ctl_free_one); |
286 | ||
0e82e5fa CL |
287 | static bool snd_ctl_remove_numid_conflict(struct snd_card *card, |
288 | unsigned int count) | |
1da177e4 | 289 | { |
82e9bae6 | 290 | struct snd_kcontrol *kctl; |
1da177e4 | 291 | |
9244b2c3 | 292 | list_for_each_entry(kctl, &card->controls, list) { |
7c733587 | 293 | if (kctl->id.numid < card->last_numid + 1 + count && |
0e82e5fa CL |
294 | kctl->id.numid + kctl->count > card->last_numid + 1) { |
295 | card->last_numid = kctl->id.numid + kctl->count - 1; | |
296 | return true; | |
297 | } | |
1da177e4 | 298 | } |
0e82e5fa | 299 | return false; |
1da177e4 LT |
300 | } |
301 | ||
82e9bae6 | 302 | static int snd_ctl_find_hole(struct snd_card *card, unsigned int count) |
1da177e4 | 303 | { |
0e82e5fa | 304 | unsigned int iter = 100000; |
1da177e4 | 305 | |
0e82e5fa | 306 | while (snd_ctl_remove_numid_conflict(card, count)) { |
1da177e4 LT |
307 | if (--iter == 0) { |
308 | /* this situation is very unlikely */ | |
309 | snd_printk(KERN_ERR "unable to allocate new control numid\n"); | |
310 | return -ENOMEM; | |
311 | } | |
1da177e4 LT |
312 | } |
313 | return 0; | |
314 | } | |
315 | ||
316 | /** | |
317 | * snd_ctl_add - add the control instance to the card | |
318 | * @card: the card instance | |
319 | * @kcontrol: the control instance to add | |
320 | * | |
321 | * Adds the control instance created via snd_ctl_new() or | |
322 | * snd_ctl_new1() to the given card. Assigns also an unique | |
323 | * numid used for fast search. | |
324 | * | |
1da177e4 | 325 | * It frees automatically the control which cannot be added. |
eb7c06e8 YB |
326 | * |
327 | * Return: Zero if successful, or a negative error code on failure. | |
328 | * | |
1da177e4 | 329 | */ |
82e9bae6 | 330 | int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol) |
1da177e4 | 331 | { |
82e9bae6 | 332 | struct snd_ctl_elem_id id; |
1da177e4 | 333 | unsigned int idx; |
c6077b30 | 334 | int err = -EINVAL; |
1da177e4 | 335 | |
73e77ba0 | 336 | if (! kcontrol) |
c6077b30 | 337 | return err; |
7eaa943c TI |
338 | if (snd_BUG_ON(!card || !kcontrol->info)) |
339 | goto error; | |
1da177e4 LT |
340 | id = kcontrol->id; |
341 | down_write(&card->controls_rwsem); | |
342 | if (snd_ctl_find_id(card, &id)) { | |
343 | up_write(&card->controls_rwsem); | |
1da177e4 LT |
344 | snd_printd(KERN_ERR "control %i:%i:%i:%s:%i is already present\n", |
345 | id.iface, | |
346 | id.device, | |
347 | id.subdevice, | |
348 | id.name, | |
349 | id.index); | |
c6077b30 TI |
350 | err = -EBUSY; |
351 | goto error; | |
1da177e4 LT |
352 | } |
353 | if (snd_ctl_find_hole(card, kcontrol->count) < 0) { | |
354 | up_write(&card->controls_rwsem); | |
c6077b30 TI |
355 | err = -ENOMEM; |
356 | goto error; | |
1da177e4 LT |
357 | } |
358 | list_add_tail(&kcontrol->list, &card->controls); | |
359 | card->controls_count += kcontrol->count; | |
360 | kcontrol->id.numid = card->last_numid + 1; | |
361 | card->last_numid += kcontrol->count; | |
362 | up_write(&card->controls_rwsem); | |
363 | for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++) | |
364 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id); | |
365 | return 0; | |
c6077b30 TI |
366 | |
367 | error: | |
368 | snd_ctl_free_one(kcontrol); | |
369 | return err; | |
1da177e4 LT |
370 | } |
371 | ||
c0d3fb39 TI |
372 | EXPORT_SYMBOL(snd_ctl_add); |
373 | ||
66b5b972 DP |
374 | /** |
375 | * snd_ctl_replace - replace the control instance of the card | |
376 | * @card: the card instance | |
377 | * @kcontrol: the control instance to replace | |
378 | * @add_on_replace: add the control if not already added | |
379 | * | |
380 | * Replaces the given control. If the given control does not exist | |
381 | * and the add_on_replace flag is set, the control is added. If the | |
382 | * control exists, it is destroyed first. | |
383 | * | |
66b5b972 | 384 | * It frees automatically the control which cannot be added or replaced. |
eb7c06e8 YB |
385 | * |
386 | * Return: Zero if successful, or a negative error code on failure. | |
66b5b972 DP |
387 | */ |
388 | int snd_ctl_replace(struct snd_card *card, struct snd_kcontrol *kcontrol, | |
389 | bool add_on_replace) | |
390 | { | |
391 | struct snd_ctl_elem_id id; | |
392 | unsigned int idx; | |
393 | struct snd_kcontrol *old; | |
394 | int ret; | |
395 | ||
396 | if (!kcontrol) | |
397 | return -EINVAL; | |
398 | if (snd_BUG_ON(!card || !kcontrol->info)) { | |
399 | ret = -EINVAL; | |
400 | goto error; | |
401 | } | |
402 | id = kcontrol->id; | |
403 | down_write(&card->controls_rwsem); | |
404 | old = snd_ctl_find_id(card, &id); | |
405 | if (!old) { | |
406 | if (add_on_replace) | |
407 | goto add; | |
408 | up_write(&card->controls_rwsem); | |
409 | ret = -EINVAL; | |
410 | goto error; | |
411 | } | |
412 | ret = snd_ctl_remove(card, old); | |
413 | if (ret < 0) { | |
414 | up_write(&card->controls_rwsem); | |
415 | goto error; | |
416 | } | |
417 | add: | |
418 | if (snd_ctl_find_hole(card, kcontrol->count) < 0) { | |
419 | up_write(&card->controls_rwsem); | |
420 | ret = -ENOMEM; | |
421 | goto error; | |
422 | } | |
423 | list_add_tail(&kcontrol->list, &card->controls); | |
424 | card->controls_count += kcontrol->count; | |
425 | kcontrol->id.numid = card->last_numid + 1; | |
426 | card->last_numid += kcontrol->count; | |
427 | up_write(&card->controls_rwsem); | |
428 | for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++) | |
429 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id); | |
430 | return 0; | |
431 | ||
432 | error: | |
433 | snd_ctl_free_one(kcontrol); | |
434 | return ret; | |
435 | } | |
436 | EXPORT_SYMBOL(snd_ctl_replace); | |
437 | ||
1da177e4 LT |
438 | /** |
439 | * snd_ctl_remove - remove the control from the card and release it | |
440 | * @card: the card instance | |
441 | * @kcontrol: the control instance to remove | |
442 | * | |
443 | * Removes the control from the card and then releases the instance. | |
444 | * You don't need to call snd_ctl_free_one(). You must be in | |
445 | * the write lock - down_write(&card->controls_rwsem). | |
eb7c06e8 YB |
446 | * |
447 | * Return: 0 if successful, or a negative error code on failure. | |
1da177e4 | 448 | */ |
82e9bae6 | 449 | int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol) |
1da177e4 | 450 | { |
82e9bae6 | 451 | struct snd_ctl_elem_id id; |
1da177e4 LT |
452 | unsigned int idx; |
453 | ||
7eaa943c TI |
454 | if (snd_BUG_ON(!card || !kcontrol)) |
455 | return -EINVAL; | |
1da177e4 LT |
456 | list_del(&kcontrol->list); |
457 | card->controls_count -= kcontrol->count; | |
458 | id = kcontrol->id; | |
459 | for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++) | |
460 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_REMOVE, &id); | |
461 | snd_ctl_free_one(kcontrol); | |
462 | return 0; | |
463 | } | |
464 | ||
c0d3fb39 TI |
465 | EXPORT_SYMBOL(snd_ctl_remove); |
466 | ||
1da177e4 LT |
467 | /** |
468 | * snd_ctl_remove_id - remove the control of the given id and release it | |
469 | * @card: the card instance | |
470 | * @id: the control id to remove | |
471 | * | |
472 | * Finds the control instance with the given id, removes it from the | |
473 | * card list and releases it. | |
eb7c06e8 YB |
474 | * |
475 | * Return: 0 if successful, or a negative error code on failure. | |
1da177e4 | 476 | */ |
82e9bae6 | 477 | int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id) |
1da177e4 | 478 | { |
82e9bae6 | 479 | struct snd_kcontrol *kctl; |
1da177e4 LT |
480 | int ret; |
481 | ||
482 | down_write(&card->controls_rwsem); | |
483 | kctl = snd_ctl_find_id(card, id); | |
484 | if (kctl == NULL) { | |
485 | up_write(&card->controls_rwsem); | |
486 | return -ENOENT; | |
487 | } | |
488 | ret = snd_ctl_remove(card, kctl); | |
489 | up_write(&card->controls_rwsem); | |
490 | return ret; | |
491 | } | |
492 | ||
c0d3fb39 TI |
493 | EXPORT_SYMBOL(snd_ctl_remove_id); |
494 | ||
1da177e4 | 495 | /** |
f217ac59 | 496 | * snd_ctl_remove_user_ctl - remove and release the unlocked user control |
1da177e4 LT |
497 | * @file: active control handle |
498 | * @id: the control id to remove | |
499 | * | |
500 | * Finds the control instance with the given id, removes it from the | |
501 | * card list and releases it. | |
eb7c06e8 YB |
502 | * |
503 | * Return: 0 if successful, or a negative error code on failure. | |
1da177e4 | 504 | */ |
f217ac59 CL |
505 | static int snd_ctl_remove_user_ctl(struct snd_ctl_file * file, |
506 | struct snd_ctl_elem_id *id) | |
1da177e4 | 507 | { |
82e9bae6 TI |
508 | struct snd_card *card = file->card; |
509 | struct snd_kcontrol *kctl; | |
1da177e4 LT |
510 | int idx, ret; |
511 | ||
512 | down_write(&card->controls_rwsem); | |
513 | kctl = snd_ctl_find_id(card, id); | |
514 | if (kctl == NULL) { | |
317b8081 CL |
515 | ret = -ENOENT; |
516 | goto error; | |
1da177e4 | 517 | } |
18dd0aa5 CL |
518 | if (!(kctl->vd[0].access & SNDRV_CTL_ELEM_ACCESS_USER)) { |
519 | ret = -EINVAL; | |
520 | goto error; | |
521 | } | |
1da177e4 LT |
522 | for (idx = 0; idx < kctl->count; idx++) |
523 | if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) { | |
317b8081 CL |
524 | ret = -EBUSY; |
525 | goto error; | |
1da177e4 LT |
526 | } |
527 | ret = snd_ctl_remove(card, kctl); | |
f217ac59 CL |
528 | if (ret < 0) |
529 | goto error; | |
530 | card->user_ctl_count--; | |
317b8081 | 531 | error: |
1da177e4 LT |
532 | up_write(&card->controls_rwsem); |
533 | return ret; | |
534 | } | |
535 | ||
3cbdd753 TI |
536 | /** |
537 | * snd_ctl_activate_id - activate/inactivate the control of the given id | |
538 | * @card: the card instance | |
539 | * @id: the control id to activate/inactivate | |
540 | * @active: non-zero to activate | |
541 | * | |
542 | * Finds the control instance with the given id, and activate or | |
543 | * inactivate the control together with notification, if changed. | |
544 | * | |
eb7c06e8 | 545 | * Return: 0 if unchanged, 1 if changed, or a negative error code on failure. |
3cbdd753 TI |
546 | */ |
547 | int snd_ctl_activate_id(struct snd_card *card, struct snd_ctl_elem_id *id, | |
548 | int active) | |
549 | { | |
550 | struct snd_kcontrol *kctl; | |
551 | struct snd_kcontrol_volatile *vd; | |
552 | unsigned int index_offset; | |
553 | int ret; | |
554 | ||
555 | down_write(&card->controls_rwsem); | |
556 | kctl = snd_ctl_find_id(card, id); | |
557 | if (kctl == NULL) { | |
558 | ret = -ENOENT; | |
559 | goto unlock; | |
560 | } | |
561 | index_offset = snd_ctl_get_ioff(kctl, &kctl->id); | |
562 | vd = &kctl->vd[index_offset]; | |
563 | ret = 0; | |
564 | if (active) { | |
565 | if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE)) | |
566 | goto unlock; | |
567 | vd->access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE; | |
568 | } else { | |
569 | if (vd->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE) | |
570 | goto unlock; | |
571 | vd->access |= SNDRV_CTL_ELEM_ACCESS_INACTIVE; | |
572 | } | |
573 | ret = 1; | |
574 | unlock: | |
575 | up_write(&card->controls_rwsem); | |
576 | if (ret > 0) | |
577 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_INFO, id); | |
578 | return ret; | |
579 | } | |
580 | EXPORT_SYMBOL_GPL(snd_ctl_activate_id); | |
581 | ||
1da177e4 LT |
582 | /** |
583 | * snd_ctl_rename_id - replace the id of a control on the card | |
584 | * @card: the card instance | |
585 | * @src_id: the old id | |
586 | * @dst_id: the new id | |
587 | * | |
588 | * Finds the control with the old id from the card, and replaces the | |
589 | * id with the new one. | |
590 | * | |
eb7c06e8 | 591 | * Return: Zero if successful, or a negative error code on failure. |
1da177e4 | 592 | */ |
82e9bae6 TI |
593 | int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id, |
594 | struct snd_ctl_elem_id *dst_id) | |
1da177e4 | 595 | { |
82e9bae6 | 596 | struct snd_kcontrol *kctl; |
1da177e4 LT |
597 | |
598 | down_write(&card->controls_rwsem); | |
599 | kctl = snd_ctl_find_id(card, src_id); | |
600 | if (kctl == NULL) { | |
601 | up_write(&card->controls_rwsem); | |
602 | return -ENOENT; | |
603 | } | |
604 | kctl->id = *dst_id; | |
605 | kctl->id.numid = card->last_numid + 1; | |
606 | card->last_numid += kctl->count; | |
607 | up_write(&card->controls_rwsem); | |
608 | return 0; | |
609 | } | |
610 | ||
c0d3fb39 TI |
611 | EXPORT_SYMBOL(snd_ctl_rename_id); |
612 | ||
1da177e4 LT |
613 | /** |
614 | * snd_ctl_find_numid - find the control instance with the given number-id | |
615 | * @card: the card instance | |
616 | * @numid: the number-id to search | |
617 | * | |
618 | * Finds the control instance with the given number-id from the card. | |
619 | * | |
1da177e4 LT |
620 | * The caller must down card->controls_rwsem before calling this function |
621 | * (if the race condition can happen). | |
eb7c06e8 YB |
622 | * |
623 | * Return: The pointer of the instance if found, or %NULL if not. | |
624 | * | |
1da177e4 | 625 | */ |
82e9bae6 | 626 | struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid) |
1da177e4 | 627 | { |
82e9bae6 | 628 | struct snd_kcontrol *kctl; |
1da177e4 | 629 | |
7eaa943c TI |
630 | if (snd_BUG_ON(!card || !numid)) |
631 | return NULL; | |
9244b2c3 | 632 | list_for_each_entry(kctl, &card->controls, list) { |
1da177e4 LT |
633 | if (kctl->id.numid <= numid && kctl->id.numid + kctl->count > numid) |
634 | return kctl; | |
635 | } | |
636 | return NULL; | |
637 | } | |
638 | ||
c0d3fb39 TI |
639 | EXPORT_SYMBOL(snd_ctl_find_numid); |
640 | ||
1da177e4 LT |
641 | /** |
642 | * snd_ctl_find_id - find the control instance with the given id | |
643 | * @card: the card instance | |
644 | * @id: the id to search | |
645 | * | |
646 | * Finds the control instance with the given id from the card. | |
647 | * | |
1da177e4 LT |
648 | * The caller must down card->controls_rwsem before calling this function |
649 | * (if the race condition can happen). | |
eb7c06e8 YB |
650 | * |
651 | * Return: The pointer of the instance if found, or %NULL if not. | |
652 | * | |
1da177e4 | 653 | */ |
82e9bae6 TI |
654 | struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card, |
655 | struct snd_ctl_elem_id *id) | |
1da177e4 | 656 | { |
82e9bae6 | 657 | struct snd_kcontrol *kctl; |
1da177e4 | 658 | |
7eaa943c TI |
659 | if (snd_BUG_ON(!card || !id)) |
660 | return NULL; | |
1da177e4 LT |
661 | if (id->numid != 0) |
662 | return snd_ctl_find_numid(card, id->numid); | |
9244b2c3 | 663 | list_for_each_entry(kctl, &card->controls, list) { |
1da177e4 LT |
664 | if (kctl->id.iface != id->iface) |
665 | continue; | |
666 | if (kctl->id.device != id->device) | |
667 | continue; | |
668 | if (kctl->id.subdevice != id->subdevice) | |
669 | continue; | |
670 | if (strncmp(kctl->id.name, id->name, sizeof(kctl->id.name))) | |
671 | continue; | |
672 | if (kctl->id.index > id->index) | |
673 | continue; | |
674 | if (kctl->id.index + kctl->count <= id->index) | |
675 | continue; | |
676 | return kctl; | |
677 | } | |
678 | return NULL; | |
679 | } | |
680 | ||
c0d3fb39 TI |
681 | EXPORT_SYMBOL(snd_ctl_find_id); |
682 | ||
82e9bae6 | 683 | static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl, |
1da177e4 LT |
684 | unsigned int cmd, void __user *arg) |
685 | { | |
82e9bae6 | 686 | struct snd_ctl_card_info *info; |
1da177e4 | 687 | |
ca2c0966 | 688 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
1da177e4 LT |
689 | if (! info) |
690 | return -ENOMEM; | |
691 | down_read(&snd_ioctl_rwsem); | |
692 | info->card = card->number; | |
693 | strlcpy(info->id, card->id, sizeof(info->id)); | |
694 | strlcpy(info->driver, card->driver, sizeof(info->driver)); | |
695 | strlcpy(info->name, card->shortname, sizeof(info->name)); | |
696 | strlcpy(info->longname, card->longname, sizeof(info->longname)); | |
697 | strlcpy(info->mixername, card->mixername, sizeof(info->mixername)); | |
698 | strlcpy(info->components, card->components, sizeof(info->components)); | |
699 | up_read(&snd_ioctl_rwsem); | |
82e9bae6 | 700 | if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info))) { |
1da177e4 LT |
701 | kfree(info); |
702 | return -EFAULT; | |
703 | } | |
704 | kfree(info); | |
705 | return 0; | |
706 | } | |
707 | ||
82e9bae6 TI |
708 | static int snd_ctl_elem_list(struct snd_card *card, |
709 | struct snd_ctl_elem_list __user *_list) | |
1da177e4 LT |
710 | { |
711 | struct list_head *plist; | |
82e9bae6 TI |
712 | struct snd_ctl_elem_list list; |
713 | struct snd_kcontrol *kctl; | |
714 | struct snd_ctl_elem_id *dst, *id; | |
78fa2c4d | 715 | unsigned int offset, space, jidx; |
1da177e4 LT |
716 | |
717 | if (copy_from_user(&list, _list, sizeof(list))) | |
718 | return -EFAULT; | |
719 | offset = list.offset; | |
720 | space = list.space; | |
1da177e4 LT |
721 | /* try limit maximum space */ |
722 | if (space > 16384) | |
723 | return -ENOMEM; | |
724 | if (space > 0) { | |
725 | /* allocate temporary buffer for atomic operation */ | |
82e9bae6 | 726 | dst = vmalloc(space * sizeof(struct snd_ctl_elem_id)); |
1da177e4 LT |
727 | if (dst == NULL) |
728 | return -ENOMEM; | |
729 | down_read(&card->controls_rwsem); | |
730 | list.count = card->controls_count; | |
731 | plist = card->controls.next; | |
732 | while (plist != &card->controls) { | |
733 | if (offset == 0) | |
734 | break; | |
735 | kctl = snd_kcontrol(plist); | |
736 | if (offset < kctl->count) | |
737 | break; | |
738 | offset -= kctl->count; | |
739 | plist = plist->next; | |
740 | } | |
741 | list.used = 0; | |
742 | id = dst; | |
743 | while (space > 0 && plist != &card->controls) { | |
744 | kctl = snd_kcontrol(plist); | |
745 | for (jidx = offset; space > 0 && jidx < kctl->count; jidx++) { | |
746 | snd_ctl_build_ioff(id, kctl, jidx); | |
747 | id++; | |
748 | space--; | |
749 | list.used++; | |
750 | } | |
751 | plist = plist->next; | |
752 | offset = 0; | |
753 | } | |
754 | up_read(&card->controls_rwsem); | |
82e9bae6 TI |
755 | if (list.used > 0 && |
756 | copy_to_user(list.pids, dst, | |
757 | list.used * sizeof(struct snd_ctl_elem_id))) { | |
1da177e4 LT |
758 | vfree(dst); |
759 | return -EFAULT; | |
760 | } | |
761 | vfree(dst); | |
762 | } else { | |
763 | down_read(&card->controls_rwsem); | |
764 | list.count = card->controls_count; | |
765 | up_read(&card->controls_rwsem); | |
766 | } | |
767 | if (copy_to_user(_list, &list, sizeof(list))) | |
768 | return -EFAULT; | |
769 | return 0; | |
770 | } | |
771 | ||
82e9bae6 TI |
772 | static int snd_ctl_elem_info(struct snd_ctl_file *ctl, |
773 | struct snd_ctl_elem_info *info) | |
1da177e4 | 774 | { |
82e9bae6 TI |
775 | struct snd_card *card = ctl->card; |
776 | struct snd_kcontrol *kctl; | |
777 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
778 | unsigned int index_offset; |
779 | int result; | |
780 | ||
781 | down_read(&card->controls_rwsem); | |
782 | kctl = snd_ctl_find_id(card, &info->id); | |
783 | if (kctl == NULL) { | |
784 | up_read(&card->controls_rwsem); | |
785 | return -ENOENT; | |
786 | } | |
787 | #ifdef CONFIG_SND_DEBUG | |
788 | info->access = 0; | |
789 | #endif | |
790 | result = kctl->info(kctl, info); | |
791 | if (result >= 0) { | |
7eaa943c | 792 | snd_BUG_ON(info->access); |
1da177e4 LT |
793 | index_offset = snd_ctl_get_ioff(kctl, &info->id); |
794 | vd = &kctl->vd[index_offset]; | |
795 | snd_ctl_build_ioff(&info->id, kctl, index_offset); | |
796 | info->access = vd->access; | |
797 | if (vd->owner) { | |
798 | info->access |= SNDRV_CTL_ELEM_ACCESS_LOCK; | |
799 | if (vd->owner == ctl) | |
800 | info->access |= SNDRV_CTL_ELEM_ACCESS_OWNER; | |
25d27ede | 801 | info->owner = pid_vnr(vd->owner->pid); |
1da177e4 LT |
802 | } else { |
803 | info->owner = -1; | |
804 | } | |
805 | } | |
806 | up_read(&card->controls_rwsem); | |
807 | return result; | |
808 | } | |
809 | ||
82e9bae6 TI |
810 | static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl, |
811 | struct snd_ctl_elem_info __user *_info) | |
1da177e4 | 812 | { |
82e9bae6 | 813 | struct snd_ctl_elem_info info; |
1da177e4 LT |
814 | int result; |
815 | ||
816 | if (copy_from_user(&info, _info, sizeof(info))) | |
817 | return -EFAULT; | |
64649400 | 818 | snd_power_lock(ctl->card); |
cbac4b0c | 819 | result = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0); |
64649400 GP |
820 | if (result >= 0) |
821 | result = snd_ctl_elem_info(ctl, &info); | |
822 | snd_power_unlock(ctl->card); | |
1da177e4 LT |
823 | if (result >= 0) |
824 | if (copy_to_user(_info, &info, sizeof(info))) | |
825 | return -EFAULT; | |
826 | return result; | |
827 | } | |
828 | ||
d3bd67cd TI |
829 | static int snd_ctl_elem_read(struct snd_card *card, |
830 | struct snd_ctl_elem_value *control) | |
1da177e4 | 831 | { |
82e9bae6 TI |
832 | struct snd_kcontrol *kctl; |
833 | struct snd_kcontrol_volatile *vd; | |
1da177e4 | 834 | unsigned int index_offset; |
8ace4f3c | 835 | int result; |
1da177e4 LT |
836 | |
837 | down_read(&card->controls_rwsem); | |
838 | kctl = snd_ctl_find_id(card, &control->id); | |
839 | if (kctl == NULL) { | |
840 | result = -ENOENT; | |
841 | } else { | |
842 | index_offset = snd_ctl_get_ioff(kctl, &control->id); | |
843 | vd = &kctl->vd[index_offset]; | |
8ace4f3c TI |
844 | if ((vd->access & SNDRV_CTL_ELEM_ACCESS_READ) && |
845 | kctl->get != NULL) { | |
846 | snd_ctl_build_ioff(&control->id, kctl, index_offset); | |
847 | result = kctl->get(kctl, control); | |
848 | } else | |
849 | result = -EPERM; | |
1da177e4 LT |
850 | } |
851 | up_read(&card->controls_rwsem); | |
852 | return result; | |
853 | } | |
854 | ||
82e9bae6 TI |
855 | static int snd_ctl_elem_read_user(struct snd_card *card, |
856 | struct snd_ctl_elem_value __user *_control) | |
1da177e4 | 857 | { |
82e9bae6 | 858 | struct snd_ctl_elem_value *control; |
1da177e4 | 859 | int result; |
ef44a1ec LZ |
860 | |
861 | control = memdup_user(_control, sizeof(*control)); | |
862 | if (IS_ERR(control)) | |
863 | return PTR_ERR(control); | |
864 | ||
64649400 | 865 | snd_power_lock(card); |
cbac4b0c | 866 | result = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
64649400 GP |
867 | if (result >= 0) |
868 | result = snd_ctl_elem_read(card, control); | |
869 | snd_power_unlock(card); | |
1da177e4 LT |
870 | if (result >= 0) |
871 | if (copy_to_user(_control, control, sizeof(*control))) | |
872 | result = -EFAULT; | |
873 | kfree(control); | |
874 | return result; | |
875 | } | |
876 | ||
d3bd67cd TI |
877 | static int snd_ctl_elem_write(struct snd_card *card, struct snd_ctl_file *file, |
878 | struct snd_ctl_elem_value *control) | |
1da177e4 | 879 | { |
82e9bae6 TI |
880 | struct snd_kcontrol *kctl; |
881 | struct snd_kcontrol_volatile *vd; | |
1da177e4 | 882 | unsigned int index_offset; |
8ace4f3c | 883 | int result; |
1da177e4 LT |
884 | |
885 | down_read(&card->controls_rwsem); | |
886 | kctl = snd_ctl_find_id(card, &control->id); | |
887 | if (kctl == NULL) { | |
888 | result = -ENOENT; | |
889 | } else { | |
890 | index_offset = snd_ctl_get_ioff(kctl, &control->id); | |
891 | vd = &kctl->vd[index_offset]; | |
8ace4f3c TI |
892 | if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_WRITE) || |
893 | kctl->put == NULL || | |
894 | (file && vd->owner && vd->owner != file)) { | |
895 | result = -EPERM; | |
1da177e4 | 896 | } else { |
8ace4f3c TI |
897 | snd_ctl_build_ioff(&control->id, kctl, index_offset); |
898 | result = kctl->put(kctl, control); | |
899 | } | |
900 | if (result > 0) { | |
901 | up_read(&card->controls_rwsem); | |
902 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, | |
903 | &control->id); | |
904 | return 0; | |
1da177e4 LT |
905 | } |
906 | } | |
907 | up_read(&card->controls_rwsem); | |
908 | return result; | |
909 | } | |
910 | ||
82e9bae6 TI |
911 | static int snd_ctl_elem_write_user(struct snd_ctl_file *file, |
912 | struct snd_ctl_elem_value __user *_control) | |
1da177e4 | 913 | { |
82e9bae6 | 914 | struct snd_ctl_elem_value *control; |
64649400 | 915 | struct snd_card *card; |
1da177e4 LT |
916 | int result; |
917 | ||
ef44a1ec LZ |
918 | control = memdup_user(_control, sizeof(*control)); |
919 | if (IS_ERR(control)) | |
920 | return PTR_ERR(control); | |
921 | ||
64649400 GP |
922 | card = file->card; |
923 | snd_power_lock(card); | |
cbac4b0c | 924 | result = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
64649400 GP |
925 | if (result >= 0) |
926 | result = snd_ctl_elem_write(card, file, control); | |
927 | snd_power_unlock(card); | |
1da177e4 LT |
928 | if (result >= 0) |
929 | if (copy_to_user(_control, control, sizeof(*control))) | |
930 | result = -EFAULT; | |
931 | kfree(control); | |
932 | return result; | |
933 | } | |
934 | ||
82e9bae6 TI |
935 | static int snd_ctl_elem_lock(struct snd_ctl_file *file, |
936 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 937 | { |
82e9bae6 TI |
938 | struct snd_card *card = file->card; |
939 | struct snd_ctl_elem_id id; | |
940 | struct snd_kcontrol *kctl; | |
941 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
942 | int result; |
943 | ||
944 | if (copy_from_user(&id, _id, sizeof(id))) | |
945 | return -EFAULT; | |
946 | down_write(&card->controls_rwsem); | |
947 | kctl = snd_ctl_find_id(card, &id); | |
948 | if (kctl == NULL) { | |
949 | result = -ENOENT; | |
950 | } else { | |
951 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; | |
952 | if (vd->owner != NULL) | |
953 | result = -EBUSY; | |
954 | else { | |
955 | vd->owner = file; | |
1da177e4 LT |
956 | result = 0; |
957 | } | |
958 | } | |
959 | up_write(&card->controls_rwsem); | |
960 | return result; | |
961 | } | |
962 | ||
82e9bae6 TI |
963 | static int snd_ctl_elem_unlock(struct snd_ctl_file *file, |
964 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 965 | { |
82e9bae6 TI |
966 | struct snd_card *card = file->card; |
967 | struct snd_ctl_elem_id id; | |
968 | struct snd_kcontrol *kctl; | |
969 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
970 | int result; |
971 | ||
972 | if (copy_from_user(&id, _id, sizeof(id))) | |
973 | return -EFAULT; | |
974 | down_write(&card->controls_rwsem); | |
975 | kctl = snd_ctl_find_id(card, &id); | |
976 | if (kctl == NULL) { | |
977 | result = -ENOENT; | |
978 | } else { | |
979 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; | |
980 | if (vd->owner == NULL) | |
981 | result = -EINVAL; | |
982 | else if (vd->owner != file) | |
983 | result = -EPERM; | |
984 | else { | |
985 | vd->owner = NULL; | |
1da177e4 LT |
986 | result = 0; |
987 | } | |
988 | } | |
989 | up_write(&card->controls_rwsem); | |
990 | return result; | |
991 | } | |
992 | ||
993 | struct user_element { | |
82e9bae6 | 994 | struct snd_ctl_elem_info info; |
1da177e4 LT |
995 | void *elem_data; /* element data */ |
996 | unsigned long elem_data_size; /* size of element data in bytes */ | |
8aa9b586 JK |
997 | void *tlv_data; /* TLV data */ |
998 | unsigned long tlv_data_size; /* TLV data size */ | |
1da177e4 | 999 | void *priv_data; /* private data (like strings for enumerated type) */ |
1da177e4 LT |
1000 | }; |
1001 | ||
82e9bae6 TI |
1002 | static int snd_ctl_elem_user_info(struct snd_kcontrol *kcontrol, |
1003 | struct snd_ctl_elem_info *uinfo) | |
1da177e4 LT |
1004 | { |
1005 | struct user_element *ue = kcontrol->private_data; | |
1006 | ||
1007 | *uinfo = ue->info; | |
1008 | return 0; | |
1009 | } | |
1010 | ||
8d448162 CL |
1011 | static int snd_ctl_elem_user_enum_info(struct snd_kcontrol *kcontrol, |
1012 | struct snd_ctl_elem_info *uinfo) | |
1013 | { | |
1014 | struct user_element *ue = kcontrol->private_data; | |
1015 | const char *names; | |
1016 | unsigned int item; | |
1017 | ||
1018 | item = uinfo->value.enumerated.item; | |
1019 | ||
1020 | *uinfo = ue->info; | |
1021 | ||
1022 | item = min(item, uinfo->value.enumerated.items - 1); | |
1023 | uinfo->value.enumerated.item = item; | |
1024 | ||
1025 | names = ue->priv_data; | |
1026 | for (; item > 0; --item) | |
1027 | names += strlen(names) + 1; | |
1028 | strcpy(uinfo->value.enumerated.name, names); | |
1029 | ||
1030 | return 0; | |
1031 | } | |
1032 | ||
82e9bae6 TI |
1033 | static int snd_ctl_elem_user_get(struct snd_kcontrol *kcontrol, |
1034 | struct snd_ctl_elem_value *ucontrol) | |
1da177e4 LT |
1035 | { |
1036 | struct user_element *ue = kcontrol->private_data; | |
1037 | ||
1038 | memcpy(&ucontrol->value, ue->elem_data, ue->elem_data_size); | |
1039 | return 0; | |
1040 | } | |
1041 | ||
82e9bae6 TI |
1042 | static int snd_ctl_elem_user_put(struct snd_kcontrol *kcontrol, |
1043 | struct snd_ctl_elem_value *ucontrol) | |
1da177e4 LT |
1044 | { |
1045 | int change; | |
1046 | struct user_element *ue = kcontrol->private_data; | |
1047 | ||
1048 | change = memcmp(&ucontrol->value, ue->elem_data, ue->elem_data_size) != 0; | |
1049 | if (change) | |
1050 | memcpy(ue->elem_data, &ucontrol->value, ue->elem_data_size); | |
1051 | return change; | |
1052 | } | |
1053 | ||
8aa9b586 JK |
1054 | static int snd_ctl_elem_user_tlv(struct snd_kcontrol *kcontrol, |
1055 | int op_flag, | |
1056 | unsigned int size, | |
1057 | unsigned int __user *tlv) | |
1058 | { | |
1059 | struct user_element *ue = kcontrol->private_data; | |
1060 | int change = 0; | |
1061 | void *new_data; | |
1062 | ||
1063 | if (op_flag > 0) { | |
1064 | if (size > 1024 * 128) /* sane value */ | |
1065 | return -EINVAL; | |
ef44a1ec LZ |
1066 | |
1067 | new_data = memdup_user(tlv, size); | |
1068 | if (IS_ERR(new_data)) | |
1069 | return PTR_ERR(new_data); | |
8aa9b586 JK |
1070 | change = ue->tlv_data_size != size; |
1071 | if (!change) | |
1072 | change = memcmp(ue->tlv_data, new_data, size); | |
1073 | kfree(ue->tlv_data); | |
1074 | ue->tlv_data = new_data; | |
1075 | ue->tlv_data_size = size; | |
1076 | } else { | |
18c1c3f6 TI |
1077 | if (! ue->tlv_data_size || ! ue->tlv_data) |
1078 | return -ENXIO; | |
8aa9b586 JK |
1079 | if (size < ue->tlv_data_size) |
1080 | return -ENOSPC; | |
1081 | if (copy_to_user(tlv, ue->tlv_data, ue->tlv_data_size)) | |
1082 | return -EFAULT; | |
1083 | } | |
1084 | return change; | |
1085 | } | |
1086 | ||
8d448162 CL |
1087 | static int snd_ctl_elem_init_enum_names(struct user_element *ue) |
1088 | { | |
1089 | char *names, *p; | |
1090 | size_t buf_len, name_len; | |
1091 | unsigned int i; | |
447c6f93 | 1092 | const uintptr_t user_ptrval = ue->info.value.enumerated.names_ptr; |
8d448162 CL |
1093 | |
1094 | if (ue->info.value.enumerated.names_length > 64 * 1024) | |
1095 | return -EINVAL; | |
1096 | ||
447c6f93 | 1097 | names = memdup_user((const void __user *)user_ptrval, |
8d448162 CL |
1098 | ue->info.value.enumerated.names_length); |
1099 | if (IS_ERR(names)) | |
1100 | return PTR_ERR(names); | |
1101 | ||
1102 | /* check that there are enough valid names */ | |
1103 | buf_len = ue->info.value.enumerated.names_length; | |
1104 | p = names; | |
1105 | for (i = 0; i < ue->info.value.enumerated.items; ++i) { | |
1106 | name_len = strnlen(p, buf_len); | |
1107 | if (name_len == 0 || name_len >= 64 || name_len == buf_len) { | |
1108 | kfree(names); | |
1109 | return -EINVAL; | |
1110 | } | |
1111 | p += name_len + 1; | |
1112 | buf_len -= name_len + 1; | |
1113 | } | |
1114 | ||
1115 | ue->priv_data = names; | |
1116 | ue->info.value.enumerated.names_ptr = 0; | |
1117 | ||
1118 | return 0; | |
1119 | } | |
1120 | ||
82e9bae6 | 1121 | static void snd_ctl_elem_user_free(struct snd_kcontrol *kcontrol) |
1da177e4 | 1122 | { |
8aa9b586 | 1123 | struct user_element *ue = kcontrol->private_data; |
8d448162 CL |
1124 | |
1125 | kfree(ue->tlv_data); | |
1126 | kfree(ue->priv_data); | |
8aa9b586 | 1127 | kfree(ue); |
1da177e4 LT |
1128 | } |
1129 | ||
82e9bae6 TI |
1130 | static int snd_ctl_elem_add(struct snd_ctl_file *file, |
1131 | struct snd_ctl_elem_info *info, int replace) | |
1da177e4 | 1132 | { |
82e9bae6 TI |
1133 | struct snd_card *card = file->card; |
1134 | struct snd_kcontrol kctl, *_kctl; | |
1da177e4 LT |
1135 | unsigned int access; |
1136 | long private_size; | |
1137 | struct user_element *ue; | |
1138 | int idx, err; | |
983929ca | 1139 | |
08ede038 | 1140 | if (!replace && card->user_ctl_count >= MAX_USER_CONTROLS) |
1da177e4 | 1141 | return -ENOMEM; |
2a031aed | 1142 | if (info->count < 1) |
1da177e4 LT |
1143 | return -EINVAL; |
1144 | access = info->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE : | |
82e9bae6 | 1145 | (info->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE| |
8aa9b586 JK |
1146 | SNDRV_CTL_ELEM_ACCESS_INACTIVE| |
1147 | SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE)); | |
1da177e4 LT |
1148 | info->id.numid = 0; |
1149 | memset(&kctl, 0, sizeof(kctl)); | |
1150 | down_write(&card->controls_rwsem); | |
1151 | _kctl = snd_ctl_find_id(card, &info->id); | |
1152 | err = 0; | |
1153 | if (_kctl) { | |
1154 | if (replace) | |
1155 | err = snd_ctl_remove(card, _kctl); | |
1156 | else | |
1157 | err = -EBUSY; | |
1158 | } else { | |
1159 | if (replace) | |
1160 | err = -ENOENT; | |
1161 | } | |
1162 | up_write(&card->controls_rwsem); | |
1163 | if (err < 0) | |
1164 | return err; | |
1165 | memcpy(&kctl.id, &info->id, sizeof(info->id)); | |
1166 | kctl.count = info->owner ? info->owner : 1; | |
1167 | access |= SNDRV_CTL_ELEM_ACCESS_USER; | |
8d448162 CL |
1168 | if (info->type == SNDRV_CTL_ELEM_TYPE_ENUMERATED) |
1169 | kctl.info = snd_ctl_elem_user_enum_info; | |
1170 | else | |
1171 | kctl.info = snd_ctl_elem_user_info; | |
1da177e4 LT |
1172 | if (access & SNDRV_CTL_ELEM_ACCESS_READ) |
1173 | kctl.get = snd_ctl_elem_user_get; | |
1174 | if (access & SNDRV_CTL_ELEM_ACCESS_WRITE) | |
1175 | kctl.put = snd_ctl_elem_user_put; | |
8aa9b586 JK |
1176 | if (access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE) { |
1177 | kctl.tlv.c = snd_ctl_elem_user_tlv; | |
1178 | access |= SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK; | |
1179 | } | |
1da177e4 LT |
1180 | switch (info->type) { |
1181 | case SNDRV_CTL_ELEM_TYPE_BOOLEAN: | |
1da177e4 LT |
1182 | case SNDRV_CTL_ELEM_TYPE_INTEGER: |
1183 | private_size = sizeof(long); | |
1184 | if (info->count > 128) | |
1185 | return -EINVAL; | |
1186 | break; | |
1187 | case SNDRV_CTL_ELEM_TYPE_INTEGER64: | |
1188 | private_size = sizeof(long long); | |
1189 | if (info->count > 64) | |
1190 | return -EINVAL; | |
1191 | break; | |
8d448162 CL |
1192 | case SNDRV_CTL_ELEM_TYPE_ENUMERATED: |
1193 | private_size = sizeof(unsigned int); | |
1194 | if (info->count > 128 || info->value.enumerated.items == 0) | |
1195 | return -EINVAL; | |
1196 | break; | |
1da177e4 LT |
1197 | case SNDRV_CTL_ELEM_TYPE_BYTES: |
1198 | private_size = sizeof(unsigned char); | |
1199 | if (info->count > 512) | |
1200 | return -EINVAL; | |
1201 | break; | |
1202 | case SNDRV_CTL_ELEM_TYPE_IEC958: | |
82e9bae6 | 1203 | private_size = sizeof(struct snd_aes_iec958); |
1da177e4 LT |
1204 | if (info->count != 1) |
1205 | return -EINVAL; | |
1206 | break; | |
1207 | default: | |
1208 | return -EINVAL; | |
1209 | } | |
1210 | private_size *= info->count; | |
ca2c0966 | 1211 | ue = kzalloc(sizeof(struct user_element) + private_size, GFP_KERNEL); |
1da177e4 LT |
1212 | if (ue == NULL) |
1213 | return -ENOMEM; | |
1214 | ue->info = *info; | |
86148e84 | 1215 | ue->info.access = 0; |
1da177e4 LT |
1216 | ue->elem_data = (char *)ue + sizeof(*ue); |
1217 | ue->elem_data_size = private_size; | |
8d448162 CL |
1218 | if (ue->info.type == SNDRV_CTL_ELEM_TYPE_ENUMERATED) { |
1219 | err = snd_ctl_elem_init_enum_names(ue); | |
1220 | if (err < 0) { | |
1221 | kfree(ue); | |
1222 | return err; | |
1223 | } | |
1224 | } | |
1da177e4 LT |
1225 | kctl.private_free = snd_ctl_elem_user_free; |
1226 | _kctl = snd_ctl_new(&kctl, access); | |
1227 | if (_kctl == NULL) { | |
8d448162 | 1228 | kfree(ue->priv_data); |
2fbf182e | 1229 | kfree(ue); |
1da177e4 LT |
1230 | return -ENOMEM; |
1231 | } | |
1232 | _kctl->private_data = ue; | |
1233 | for (idx = 0; idx < _kctl->count; idx++) | |
1234 | _kctl->vd[idx].owner = file; | |
1235 | err = snd_ctl_add(card, _kctl); | |
2fbf182e | 1236 | if (err < 0) |
1da177e4 | 1237 | return err; |
1da177e4 LT |
1238 | |
1239 | down_write(&card->controls_rwsem); | |
1240 | card->user_ctl_count++; | |
1241 | up_write(&card->controls_rwsem); | |
1242 | ||
1243 | return 0; | |
1244 | } | |
1245 | ||
82e9bae6 TI |
1246 | static int snd_ctl_elem_add_user(struct snd_ctl_file *file, |
1247 | struct snd_ctl_elem_info __user *_info, int replace) | |
1da177e4 | 1248 | { |
82e9bae6 | 1249 | struct snd_ctl_elem_info info; |
1da177e4 LT |
1250 | if (copy_from_user(&info, _info, sizeof(info))) |
1251 | return -EFAULT; | |
1252 | return snd_ctl_elem_add(file, &info, replace); | |
1253 | } | |
1254 | ||
82e9bae6 TI |
1255 | static int snd_ctl_elem_remove(struct snd_ctl_file *file, |
1256 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 1257 | { |
82e9bae6 | 1258 | struct snd_ctl_elem_id id; |
1da177e4 LT |
1259 | |
1260 | if (copy_from_user(&id, _id, sizeof(id))) | |
1261 | return -EFAULT; | |
f217ac59 | 1262 | return snd_ctl_remove_user_ctl(file, &id); |
1da177e4 LT |
1263 | } |
1264 | ||
82e9bae6 | 1265 | static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr) |
1da177e4 LT |
1266 | { |
1267 | int subscribe; | |
1268 | if (get_user(subscribe, ptr)) | |
1269 | return -EFAULT; | |
1270 | if (subscribe < 0) { | |
1271 | subscribe = file->subscribed; | |
1272 | if (put_user(subscribe, ptr)) | |
1273 | return -EFAULT; | |
1274 | return 0; | |
1275 | } | |
1276 | if (subscribe) { | |
1277 | file->subscribed = 1; | |
1278 | return 0; | |
1279 | } else if (file->subscribed) { | |
1280 | snd_ctl_empty_read_queue(file); | |
1281 | file->subscribed = 0; | |
1282 | } | |
1283 | return 0; | |
1284 | } | |
1285 | ||
8aa9b586 JK |
1286 | static int snd_ctl_tlv_ioctl(struct snd_ctl_file *file, |
1287 | struct snd_ctl_tlv __user *_tlv, | |
1288 | int op_flag) | |
42750b04 | 1289 | { |
8aa9b586 | 1290 | struct snd_card *card = file->card; |
42750b04 JK |
1291 | struct snd_ctl_tlv tlv; |
1292 | struct snd_kcontrol *kctl; | |
8aa9b586 | 1293 | struct snd_kcontrol_volatile *vd; |
42750b04 JK |
1294 | unsigned int len; |
1295 | int err = 0; | |
1296 | ||
1297 | if (copy_from_user(&tlv, _tlv, sizeof(tlv))) | |
1298 | return -EFAULT; | |
6123637f | 1299 | if (tlv.length < sizeof(unsigned int) * 2) |
8aa9b586 JK |
1300 | return -EINVAL; |
1301 | down_read(&card->controls_rwsem); | |
1302 | kctl = snd_ctl_find_numid(card, tlv.numid); | |
1303 | if (kctl == NULL) { | |
1304 | err = -ENOENT; | |
1305 | goto __kctl_end; | |
1306 | } | |
1307 | if (kctl->tlv.p == NULL) { | |
1308 | err = -ENXIO; | |
1309 | goto __kctl_end; | |
1310 | } | |
1311 | vd = &kctl->vd[tlv.numid - kctl->id.numid]; | |
1312 | if ((op_flag == 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_READ) == 0) || | |
1313 | (op_flag > 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE) == 0) || | |
1314 | (op_flag < 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND) == 0)) { | |
1315 | err = -ENXIO; | |
1316 | goto __kctl_end; | |
1317 | } | |
1318 | if (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) { | |
bec145ae | 1319 | if (vd->owner != NULL && vd->owner != file) { |
8aa9b586 JK |
1320 | err = -EPERM; |
1321 | goto __kctl_end; | |
1322 | } | |
bd483d4c | 1323 | err = kctl->tlv.c(kctl, op_flag, tlv.length, _tlv->tlv); |
8aa9b586 JK |
1324 | if (err > 0) { |
1325 | up_read(&card->controls_rwsem); | |
1326 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_TLV, &kctl->id); | |
1327 | return 0; | |
1328 | } | |
1329 | } else { | |
1330 | if (op_flag) { | |
1331 | err = -ENXIO; | |
1332 | goto __kctl_end; | |
1333 | } | |
1334 | len = kctl->tlv.p[1] + 2 * sizeof(unsigned int); | |
1335 | if (tlv.length < len) { | |
1336 | err = -ENOMEM; | |
1337 | goto __kctl_end; | |
1338 | } | |
1339 | if (copy_to_user(_tlv->tlv, kctl->tlv.p, len)) | |
1340 | err = -EFAULT; | |
1341 | } | |
42750b04 | 1342 | __kctl_end: |
8aa9b586 JK |
1343 | up_read(&card->controls_rwsem); |
1344 | return err; | |
42750b04 JK |
1345 | } |
1346 | ||
1da177e4 LT |
1347 | static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1348 | { | |
82e9bae6 TI |
1349 | struct snd_ctl_file *ctl; |
1350 | struct snd_card *card; | |
82e9bae6 | 1351 | struct snd_kctl_ioctl *p; |
1da177e4 LT |
1352 | void __user *argp = (void __user *)arg; |
1353 | int __user *ip = argp; | |
1354 | int err; | |
1355 | ||
1356 | ctl = file->private_data; | |
1357 | card = ctl->card; | |
7eaa943c TI |
1358 | if (snd_BUG_ON(!card)) |
1359 | return -ENXIO; | |
1da177e4 LT |
1360 | switch (cmd) { |
1361 | case SNDRV_CTL_IOCTL_PVERSION: | |
1362 | return put_user(SNDRV_CTL_VERSION, ip) ? -EFAULT : 0; | |
1363 | case SNDRV_CTL_IOCTL_CARD_INFO: | |
1364 | return snd_ctl_card_info(card, ctl, cmd, argp); | |
1365 | case SNDRV_CTL_IOCTL_ELEM_LIST: | |
42750b04 | 1366 | return snd_ctl_elem_list(card, argp); |
1da177e4 LT |
1367 | case SNDRV_CTL_IOCTL_ELEM_INFO: |
1368 | return snd_ctl_elem_info_user(ctl, argp); | |
1369 | case SNDRV_CTL_IOCTL_ELEM_READ: | |
42750b04 | 1370 | return snd_ctl_elem_read_user(card, argp); |
1da177e4 LT |
1371 | case SNDRV_CTL_IOCTL_ELEM_WRITE: |
1372 | return snd_ctl_elem_write_user(ctl, argp); | |
1373 | case SNDRV_CTL_IOCTL_ELEM_LOCK: | |
1374 | return snd_ctl_elem_lock(ctl, argp); | |
1375 | case SNDRV_CTL_IOCTL_ELEM_UNLOCK: | |
1376 | return snd_ctl_elem_unlock(ctl, argp); | |
1377 | case SNDRV_CTL_IOCTL_ELEM_ADD: | |
1378 | return snd_ctl_elem_add_user(ctl, argp, 0); | |
1379 | case SNDRV_CTL_IOCTL_ELEM_REPLACE: | |
1380 | return snd_ctl_elem_add_user(ctl, argp, 1); | |
1381 | case SNDRV_CTL_IOCTL_ELEM_REMOVE: | |
1382 | return snd_ctl_elem_remove(ctl, argp); | |
1383 | case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS: | |
1384 | return snd_ctl_subscribe_events(ctl, ip); | |
8aa9b586 JK |
1385 | case SNDRV_CTL_IOCTL_TLV_READ: |
1386 | return snd_ctl_tlv_ioctl(ctl, argp, 0); | |
1387 | case SNDRV_CTL_IOCTL_TLV_WRITE: | |
1388 | return snd_ctl_tlv_ioctl(ctl, argp, 1); | |
1389 | case SNDRV_CTL_IOCTL_TLV_COMMAND: | |
1390 | return snd_ctl_tlv_ioctl(ctl, argp, -1); | |
1da177e4 | 1391 | case SNDRV_CTL_IOCTL_POWER: |
a381a7a6 | 1392 | return -ENOPROTOOPT; |
1da177e4 LT |
1393 | case SNDRV_CTL_IOCTL_POWER_STATE: |
1394 | #ifdef CONFIG_PM | |
1395 | return put_user(card->power_state, ip) ? -EFAULT : 0; | |
1396 | #else | |
1397 | return put_user(SNDRV_CTL_POWER_D0, ip) ? -EFAULT : 0; | |
1398 | #endif | |
1399 | } | |
1400 | down_read(&snd_ioctl_rwsem); | |
9244b2c3 | 1401 | list_for_each_entry(p, &snd_control_ioctls, list) { |
1da177e4 LT |
1402 | err = p->fioctl(card, ctl, cmd, arg); |
1403 | if (err != -ENOIOCTLCMD) { | |
1404 | up_read(&snd_ioctl_rwsem); | |
1405 | return err; | |
1406 | } | |
1407 | } | |
1408 | up_read(&snd_ioctl_rwsem); | |
6d85be61 | 1409 | snd_printdd("unknown ioctl = 0x%x\n", cmd); |
1da177e4 LT |
1410 | return -ENOTTY; |
1411 | } | |
1412 | ||
82e9bae6 TI |
1413 | static ssize_t snd_ctl_read(struct file *file, char __user *buffer, |
1414 | size_t count, loff_t * offset) | |
1da177e4 | 1415 | { |
82e9bae6 | 1416 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1417 | int err = 0; |
1418 | ssize_t result = 0; | |
1419 | ||
1420 | ctl = file->private_data; | |
7eaa943c TI |
1421 | if (snd_BUG_ON(!ctl || !ctl->card)) |
1422 | return -ENXIO; | |
1da177e4 LT |
1423 | if (!ctl->subscribed) |
1424 | return -EBADFD; | |
82e9bae6 | 1425 | if (count < sizeof(struct snd_ctl_event)) |
1da177e4 LT |
1426 | return -EINVAL; |
1427 | spin_lock_irq(&ctl->read_lock); | |
82e9bae6 TI |
1428 | while (count >= sizeof(struct snd_ctl_event)) { |
1429 | struct snd_ctl_event ev; | |
1430 | struct snd_kctl_event *kev; | |
1da177e4 LT |
1431 | while (list_empty(&ctl->events)) { |
1432 | wait_queue_t wait; | |
1433 | if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { | |
1434 | err = -EAGAIN; | |
1435 | goto __end_lock; | |
1436 | } | |
1437 | init_waitqueue_entry(&wait, current); | |
1438 | add_wait_queue(&ctl->change_sleep, &wait); | |
1439 | set_current_state(TASK_INTERRUPTIBLE); | |
1440 | spin_unlock_irq(&ctl->read_lock); | |
1441 | schedule(); | |
1442 | remove_wait_queue(&ctl->change_sleep, &wait); | |
0914f796 TI |
1443 | if (ctl->card->shutdown) |
1444 | return -ENODEV; | |
1da177e4 | 1445 | if (signal_pending(current)) |
0e5d720c | 1446 | return -ERESTARTSYS; |
1da177e4 LT |
1447 | spin_lock_irq(&ctl->read_lock); |
1448 | } | |
1449 | kev = snd_kctl_event(ctl->events.next); | |
1450 | ev.type = SNDRV_CTL_EVENT_ELEM; | |
1451 | ev.data.elem.mask = kev->mask; | |
1452 | ev.data.elem.id = kev->id; | |
1453 | list_del(&kev->list); | |
1454 | spin_unlock_irq(&ctl->read_lock); | |
1455 | kfree(kev); | |
82e9bae6 | 1456 | if (copy_to_user(buffer, &ev, sizeof(struct snd_ctl_event))) { |
1da177e4 LT |
1457 | err = -EFAULT; |
1458 | goto __end; | |
1459 | } | |
1460 | spin_lock_irq(&ctl->read_lock); | |
82e9bae6 TI |
1461 | buffer += sizeof(struct snd_ctl_event); |
1462 | count -= sizeof(struct snd_ctl_event); | |
1463 | result += sizeof(struct snd_ctl_event); | |
1da177e4 LT |
1464 | } |
1465 | __end_lock: | |
1466 | spin_unlock_irq(&ctl->read_lock); | |
1467 | __end: | |
1468 | return result > 0 ? result : err; | |
1469 | } | |
1470 | ||
1471 | static unsigned int snd_ctl_poll(struct file *file, poll_table * wait) | |
1472 | { | |
1473 | unsigned int mask; | |
82e9bae6 | 1474 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1475 | |
1476 | ctl = file->private_data; | |
1477 | if (!ctl->subscribed) | |
1478 | return 0; | |
1479 | poll_wait(file, &ctl->change_sleep, wait); | |
1480 | ||
1481 | mask = 0; | |
1482 | if (!list_empty(&ctl->events)) | |
1483 | mask |= POLLIN | POLLRDNORM; | |
1484 | ||
1485 | return mask; | |
1486 | } | |
1487 | ||
1488 | /* | |
1489 | * register the device-specific control-ioctls. | |
1490 | * called from each device manager like pcm.c, hwdep.c, etc. | |
1491 | */ | |
1492 | static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists) | |
1493 | { | |
82e9bae6 | 1494 | struct snd_kctl_ioctl *pn; |
1da177e4 | 1495 | |
82e9bae6 | 1496 | pn = kzalloc(sizeof(struct snd_kctl_ioctl), GFP_KERNEL); |
1da177e4 LT |
1497 | if (pn == NULL) |
1498 | return -ENOMEM; | |
1499 | pn->fioctl = fcn; | |
1500 | down_write(&snd_ioctl_rwsem); | |
1501 | list_add_tail(&pn->list, lists); | |
1502 | up_write(&snd_ioctl_rwsem); | |
1503 | return 0; | |
1504 | } | |
1505 | ||
1506 | int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn) | |
1507 | { | |
1508 | return _snd_ctl_register_ioctl(fcn, &snd_control_ioctls); | |
1509 | } | |
1510 | ||
c0d3fb39 TI |
1511 | EXPORT_SYMBOL(snd_ctl_register_ioctl); |
1512 | ||
1da177e4 LT |
1513 | #ifdef CONFIG_COMPAT |
1514 | int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn) | |
1515 | { | |
1516 | return _snd_ctl_register_ioctl(fcn, &snd_control_compat_ioctls); | |
1517 | } | |
c0d3fb39 TI |
1518 | |
1519 | EXPORT_SYMBOL(snd_ctl_register_ioctl_compat); | |
1da177e4 LT |
1520 | #endif |
1521 | ||
1522 | /* | |
1523 | * de-register the device-specific control-ioctls. | |
1524 | */ | |
82e9bae6 TI |
1525 | static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn, |
1526 | struct list_head *lists) | |
1da177e4 | 1527 | { |
82e9bae6 | 1528 | struct snd_kctl_ioctl *p; |
1da177e4 | 1529 | |
7eaa943c TI |
1530 | if (snd_BUG_ON(!fcn)) |
1531 | return -EINVAL; | |
1da177e4 | 1532 | down_write(&snd_ioctl_rwsem); |
9244b2c3 | 1533 | list_for_each_entry(p, lists, list) { |
1da177e4 LT |
1534 | if (p->fioctl == fcn) { |
1535 | list_del(&p->list); | |
1536 | up_write(&snd_ioctl_rwsem); | |
1537 | kfree(p); | |
1538 | return 0; | |
1539 | } | |
1540 | } | |
1541 | up_write(&snd_ioctl_rwsem); | |
1542 | snd_BUG(); | |
1543 | return -EINVAL; | |
1544 | } | |
1545 | ||
1546 | int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn) | |
1547 | { | |
1548 | return _snd_ctl_unregister_ioctl(fcn, &snd_control_ioctls); | |
1549 | } | |
1550 | ||
c0d3fb39 TI |
1551 | EXPORT_SYMBOL(snd_ctl_unregister_ioctl); |
1552 | ||
1da177e4 LT |
1553 | #ifdef CONFIG_COMPAT |
1554 | int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn) | |
1555 | { | |
1556 | return _snd_ctl_unregister_ioctl(fcn, &snd_control_compat_ioctls); | |
1557 | } | |
1558 | ||
c0d3fb39 | 1559 | EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat); |
1da177e4 LT |
1560 | #endif |
1561 | ||
1562 | static int snd_ctl_fasync(int fd, struct file * file, int on) | |
1563 | { | |
82e9bae6 | 1564 | struct snd_ctl_file *ctl; |
60aa4924 | 1565 | |
1da177e4 | 1566 | ctl = file->private_data; |
60aa4924 | 1567 | return fasync_helper(fd, file, on, &ctl->fasync); |
1da177e4 LT |
1568 | } |
1569 | ||
1570 | /* | |
1571 | * ioctl32 compat | |
1572 | */ | |
1573 | #ifdef CONFIG_COMPAT | |
1574 | #include "control_compat.c" | |
1575 | #else | |
1576 | #define snd_ctl_ioctl_compat NULL | |
1577 | #endif | |
1578 | ||
1579 | /* | |
1580 | * INIT PART | |
1581 | */ | |
1582 | ||
9c2e08c5 | 1583 | static const struct file_operations snd_ctl_f_ops = |
1da177e4 LT |
1584 | { |
1585 | .owner = THIS_MODULE, | |
1586 | .read = snd_ctl_read, | |
1587 | .open = snd_ctl_open, | |
1588 | .release = snd_ctl_release, | |
02f4865f | 1589 | .llseek = no_llseek, |
1da177e4 LT |
1590 | .poll = snd_ctl_poll, |
1591 | .unlocked_ioctl = snd_ctl_ioctl, | |
1592 | .compat_ioctl = snd_ctl_ioctl_compat, | |
1593 | .fasync = snd_ctl_fasync, | |
1594 | }; | |
1595 | ||
1da177e4 LT |
1596 | /* |
1597 | * registration of the control device | |
1598 | */ | |
82e9bae6 | 1599 | static int snd_ctl_dev_register(struct snd_device *device) |
1da177e4 | 1600 | { |
82e9bae6 | 1601 | struct snd_card *card = device->device_data; |
1da177e4 LT |
1602 | int err, cardnum; |
1603 | char name[16]; | |
1604 | ||
7eaa943c TI |
1605 | if (snd_BUG_ON(!card)) |
1606 | return -ENXIO; | |
1da177e4 | 1607 | cardnum = card->number; |
7eaa943c TI |
1608 | if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS)) |
1609 | return -ENXIO; | |
1da177e4 | 1610 | sprintf(name, "controlC%i", cardnum); |
f87135f5 CL |
1611 | if ((err = snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1, |
1612 | &snd_ctl_f_ops, card, name)) < 0) | |
1da177e4 LT |
1613 | return err; |
1614 | return 0; | |
1615 | } | |
1616 | ||
1617 | /* | |
1618 | * disconnection of the control device | |
1619 | */ | |
82e9bae6 | 1620 | static int snd_ctl_dev_disconnect(struct snd_device *device) |
1da177e4 | 1621 | { |
82e9bae6 | 1622 | struct snd_card *card = device->device_data; |
82e9bae6 | 1623 | struct snd_ctl_file *ctl; |
c461482c TI |
1624 | int err, cardnum; |
1625 | ||
7eaa943c TI |
1626 | if (snd_BUG_ON(!card)) |
1627 | return -ENXIO; | |
c461482c | 1628 | cardnum = card->number; |
7eaa943c TI |
1629 | if (snd_BUG_ON(cardnum < 0 || cardnum >= SNDRV_CARDS)) |
1630 | return -ENXIO; | |
1da177e4 | 1631 | |
d8009882 | 1632 | read_lock(&card->ctl_files_rwlock); |
9244b2c3 | 1633 | list_for_each_entry(ctl, &card->ctl_files, list) { |
1da177e4 LT |
1634 | wake_up(&ctl->change_sleep); |
1635 | kill_fasync(&ctl->fasync, SIGIO, POLL_ERR); | |
1636 | } | |
d8009882 | 1637 | read_unlock(&card->ctl_files_rwlock); |
c461482c TI |
1638 | |
1639 | if ((err = snd_unregister_device(SNDRV_DEVICE_TYPE_CONTROL, | |
1640 | card, -1)) < 0) | |
1641 | return err; | |
1da177e4 LT |
1642 | return 0; |
1643 | } | |
1644 | ||
1645 | /* | |
1646 | * free all controls | |
1647 | */ | |
82e9bae6 | 1648 | static int snd_ctl_dev_free(struct snd_device *device) |
1da177e4 | 1649 | { |
82e9bae6 TI |
1650 | struct snd_card *card = device->device_data; |
1651 | struct snd_kcontrol *control; | |
1da177e4 LT |
1652 | |
1653 | down_write(&card->controls_rwsem); | |
1654 | while (!list_empty(&card->controls)) { | |
1655 | control = snd_kcontrol(card->controls.next); | |
1656 | snd_ctl_remove(card, control); | |
1657 | } | |
1658 | up_write(&card->controls_rwsem); | |
1659 | return 0; | |
1660 | } | |
1661 | ||
1da177e4 LT |
1662 | /* |
1663 | * create control core: | |
1664 | * called from init.c | |
1665 | */ | |
82e9bae6 | 1666 | int snd_ctl_create(struct snd_card *card) |
1da177e4 | 1667 | { |
82e9bae6 | 1668 | static struct snd_device_ops ops = { |
1da177e4 LT |
1669 | .dev_free = snd_ctl_dev_free, |
1670 | .dev_register = snd_ctl_dev_register, | |
1671 | .dev_disconnect = snd_ctl_dev_disconnect, | |
1da177e4 LT |
1672 | }; |
1673 | ||
7eaa943c TI |
1674 | if (snd_BUG_ON(!card)) |
1675 | return -ENXIO; | |
1da177e4 LT |
1676 | return snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops); |
1677 | } | |
b9ed4f2b TI |
1678 | |
1679 | /* | |
9600732b | 1680 | * Frequently used control callbacks/helpers |
b9ed4f2b TI |
1681 | */ |
1682 | int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol, | |
1683 | struct snd_ctl_elem_info *uinfo) | |
1684 | { | |
1685 | uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; | |
1686 | uinfo->count = 1; | |
1687 | uinfo->value.integer.min = 0; | |
1688 | uinfo->value.integer.max = 1; | |
1689 | return 0; | |
1690 | } | |
1691 | ||
1692 | EXPORT_SYMBOL(snd_ctl_boolean_mono_info); | |
1693 | ||
1694 | int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol, | |
1695 | struct snd_ctl_elem_info *uinfo) | |
1696 | { | |
1697 | uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; | |
1698 | uinfo->count = 2; | |
1699 | uinfo->value.integer.min = 0; | |
1700 | uinfo->value.integer.max = 1; | |
1701 | return 0; | |
1702 | } | |
1703 | ||
1704 | EXPORT_SYMBOL(snd_ctl_boolean_stereo_info); | |
9600732b CL |
1705 | |
1706 | /** | |
1707 | * snd_ctl_enum_info - fills the info structure for an enumerated control | |
1708 | * @info: the structure to be filled | |
1709 | * @channels: the number of the control's channels; often one | |
1710 | * @items: the number of control values; also the size of @names | |
1711 | * @names: an array containing the names of all control values | |
1712 | * | |
1713 | * Sets all required fields in @info to their appropriate values. | |
1714 | * If the control's accessibility is not the default (readable and writable), | |
1715 | * the caller has to fill @info->access. | |
eb7c06e8 YB |
1716 | * |
1717 | * Return: Zero. | |
9600732b CL |
1718 | */ |
1719 | int snd_ctl_enum_info(struct snd_ctl_elem_info *info, unsigned int channels, | |
1720 | unsigned int items, const char *const names[]) | |
1721 | { | |
1722 | info->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED; | |
1723 | info->count = channels; | |
1724 | info->value.enumerated.items = items; | |
1725 | if (info->value.enumerated.item >= items) | |
1726 | info->value.enumerated.item = items - 1; | |
1727 | strlcpy(info->value.enumerated.name, | |
1728 | names[info->value.enumerated.item], | |
1729 | sizeof(info->value.enumerated.name)); | |
1730 | return 0; | |
1731 | } | |
1732 | EXPORT_SYMBOL(snd_ctl_enum_info); |