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Commit | Line | Data |
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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; | |
23c18d4b | 53 | int i, err; |
1da177e4 | 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; | |
23c18d4b TI |
82 | for (i = 0; i < SND_CTL_SUBDEV_ITEMS; i++) |
83 | ctl->preferred_subdevice[i] = -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 | ||
12cddbd8 TI |
144 | /** |
145 | * snd_ctl_notify - Send notification to user-space for a control change | |
146 | * @card: the card to send notification | |
147 | * @mask: the event mask, SNDRV_CTL_EVENT_* | |
148 | * @id: the ctl element id to send notification | |
149 | * | |
150 | * This function adds an event record with the given id and mask, appends | |
151 | * to the list and wakes up the user-space for notification. This can be | |
152 | * called in the atomic context. | |
153 | */ | |
82e9bae6 TI |
154 | void snd_ctl_notify(struct snd_card *card, unsigned int mask, |
155 | struct snd_ctl_elem_id *id) | |
1da177e4 LT |
156 | { |
157 | unsigned long flags; | |
82e9bae6 TI |
158 | struct snd_ctl_file *ctl; |
159 | struct snd_kctl_event *ev; | |
1da177e4 | 160 | |
7eaa943c TI |
161 | if (snd_BUG_ON(!card || !id)) |
162 | return; | |
1da177e4 | 163 | read_lock(&card->ctl_files_rwlock); |
8eeaa2f9 | 164 | #if IS_ENABLED(CONFIG_SND_MIXER_OSS) |
1da177e4 LT |
165 | card->mixer_oss_change_count++; |
166 | #endif | |
9244b2c3 | 167 | list_for_each_entry(ctl, &card->ctl_files, list) { |
1da177e4 LT |
168 | if (!ctl->subscribed) |
169 | continue; | |
170 | spin_lock_irqsave(&ctl->read_lock, flags); | |
9244b2c3 | 171 | list_for_each_entry(ev, &ctl->events, list) { |
1da177e4 LT |
172 | if (ev->id.numid == id->numid) { |
173 | ev->mask |= mask; | |
174 | goto _found; | |
175 | } | |
176 | } | |
ca2c0966 | 177 | ev = kzalloc(sizeof(*ev), GFP_ATOMIC); |
1da177e4 LT |
178 | if (ev) { |
179 | ev->id = *id; | |
180 | ev->mask = mask; | |
181 | list_add_tail(&ev->list, &ctl->events); | |
182 | } else { | |
bb009457 | 183 | dev_err(card->dev, "No memory available to allocate event\n"); |
1da177e4 LT |
184 | } |
185 | _found: | |
186 | wake_up(&ctl->change_sleep); | |
187 | spin_unlock_irqrestore(&ctl->read_lock, flags); | |
188 | kill_fasync(&ctl->fasync, SIGIO, POLL_IN); | |
189 | } | |
190 | read_unlock(&card->ctl_files_rwlock); | |
191 | } | |
c0d3fb39 TI |
192 | EXPORT_SYMBOL(snd_ctl_notify); |
193 | ||
1da177e4 LT |
194 | /** |
195 | * snd_ctl_new - create a control instance from the template | |
196 | * @control: the control template | |
197 | * @access: the default control access | |
198 | * | |
82e9bae6 | 199 | * Allocates a new struct snd_kcontrol instance and copies the given template |
1da177e4 LT |
200 | * to the new instance. It does not copy volatile data (access). |
201 | * | |
eb7c06e8 | 202 | * Return: The pointer of the new instance, or %NULL on failure. |
1da177e4 | 203 | */ |
0b51ba07 AB |
204 | static struct snd_kcontrol *snd_ctl_new(struct snd_kcontrol *control, |
205 | unsigned int access) | |
1da177e4 | 206 | { |
82e9bae6 | 207 | struct snd_kcontrol *kctl; |
1da177e4 LT |
208 | unsigned int idx; |
209 | ||
7eaa943c TI |
210 | if (snd_BUG_ON(!control || !control->count)) |
211 | return NULL; | |
5591bf07 DR |
212 | |
213 | if (control->count > MAX_CONTROL_COUNT) | |
214 | return NULL; | |
215 | ||
82e9bae6 | 216 | kctl = kzalloc(sizeof(*kctl) + sizeof(struct snd_kcontrol_volatile) * control->count, GFP_KERNEL); |
73e77ba0 | 217 | if (kctl == NULL) { |
bb009457 | 218 | pr_err("ALSA: Cannot allocate control instance\n"); |
1da177e4 | 219 | return NULL; |
73e77ba0 | 220 | } |
1da177e4 LT |
221 | *kctl = *control; |
222 | for (idx = 0; idx < kctl->count; idx++) | |
223 | kctl->vd[idx].access = access; | |
224 | return kctl; | |
225 | } | |
226 | ||
227 | /** | |
228 | * snd_ctl_new1 - create a control instance from the template | |
229 | * @ncontrol: the initialization record | |
230 | * @private_data: the private data to set | |
231 | * | |
82e9bae6 | 232 | * Allocates a new struct snd_kcontrol instance and initialize from the given |
1da177e4 LT |
233 | * template. When the access field of ncontrol is 0, it's assumed as |
234 | * READWRITE access. When the count field is 0, it's assumes as one. | |
235 | * | |
eb7c06e8 | 236 | * Return: The pointer of the newly generated instance, or %NULL on failure. |
1da177e4 | 237 | */ |
82e9bae6 TI |
238 | struct snd_kcontrol *snd_ctl_new1(const struct snd_kcontrol_new *ncontrol, |
239 | void *private_data) | |
1da177e4 | 240 | { |
82e9bae6 | 241 | struct snd_kcontrol kctl; |
1da177e4 LT |
242 | unsigned int access; |
243 | ||
7eaa943c TI |
244 | if (snd_BUG_ON(!ncontrol || !ncontrol->info)) |
245 | return NULL; | |
1da177e4 LT |
246 | memset(&kctl, 0, sizeof(kctl)); |
247 | kctl.id.iface = ncontrol->iface; | |
248 | kctl.id.device = ncontrol->device; | |
249 | kctl.id.subdevice = ncontrol->subdevice; | |
366840d7 | 250 | if (ncontrol->name) { |
1da177e4 | 251 | strlcpy(kctl.id.name, ncontrol->name, sizeof(kctl.id.name)); |
366840d7 | 252 | if (strcmp(ncontrol->name, kctl.id.name) != 0) |
bb009457 TI |
253 | pr_warn("ALSA: Control name '%s' truncated to '%s'\n", |
254 | ncontrol->name, kctl.id.name); | |
366840d7 | 255 | } |
1da177e4 LT |
256 | kctl.id.index = ncontrol->index; |
257 | kctl.count = ncontrol->count ? ncontrol->count : 1; | |
258 | access = ncontrol->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE : | |
8aa9b586 | 259 | (ncontrol->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE| |
a8d372f1 | 260 | SNDRV_CTL_ELEM_ACCESS_VOLATILE| |
8aa9b586 | 261 | SNDRV_CTL_ELEM_ACCESS_INACTIVE| |
a75d7a4c CL |
262 | SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE| |
263 | SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND| | |
264 | SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK)); | |
1da177e4 LT |
265 | kctl.info = ncontrol->info; |
266 | kctl.get = ncontrol->get; | |
267 | kctl.put = ncontrol->put; | |
8aa9b586 | 268 | kctl.tlv.p = ncontrol->tlv.p; |
1da177e4 LT |
269 | kctl.private_value = ncontrol->private_value; |
270 | kctl.private_data = private_data; | |
271 | return snd_ctl_new(&kctl, access); | |
272 | } | |
c0d3fb39 TI |
273 | EXPORT_SYMBOL(snd_ctl_new1); |
274 | ||
1da177e4 LT |
275 | /** |
276 | * snd_ctl_free_one - release the control instance | |
277 | * @kcontrol: the control instance | |
278 | * | |
279 | * Releases the control instance created via snd_ctl_new() | |
280 | * or snd_ctl_new1(). | |
281 | * Don't call this after the control was added to the card. | |
282 | */ | |
82e9bae6 | 283 | void snd_ctl_free_one(struct snd_kcontrol *kcontrol) |
1da177e4 LT |
284 | { |
285 | if (kcontrol) { | |
286 | if (kcontrol->private_free) | |
287 | kcontrol->private_free(kcontrol); | |
288 | kfree(kcontrol); | |
289 | } | |
290 | } | |
c0d3fb39 TI |
291 | EXPORT_SYMBOL(snd_ctl_free_one); |
292 | ||
0e82e5fa CL |
293 | static bool snd_ctl_remove_numid_conflict(struct snd_card *card, |
294 | unsigned int count) | |
1da177e4 | 295 | { |
82e9bae6 | 296 | struct snd_kcontrol *kctl; |
1da177e4 | 297 | |
ac902c11 LPC |
298 | /* Make sure that the ids assigned to the control do not wrap around */ |
299 | if (card->last_numid >= UINT_MAX - count) | |
300 | card->last_numid = 0; | |
301 | ||
9244b2c3 | 302 | list_for_each_entry(kctl, &card->controls, list) { |
7c733587 | 303 | if (kctl->id.numid < card->last_numid + 1 + count && |
0e82e5fa CL |
304 | kctl->id.numid + kctl->count > card->last_numid + 1) { |
305 | card->last_numid = kctl->id.numid + kctl->count - 1; | |
306 | return true; | |
307 | } | |
1da177e4 | 308 | } |
0e82e5fa | 309 | return false; |
1da177e4 LT |
310 | } |
311 | ||
82e9bae6 | 312 | static int snd_ctl_find_hole(struct snd_card *card, unsigned int count) |
1da177e4 | 313 | { |
0e82e5fa | 314 | unsigned int iter = 100000; |
1da177e4 | 315 | |
0e82e5fa | 316 | while (snd_ctl_remove_numid_conflict(card, count)) { |
1da177e4 LT |
317 | if (--iter == 0) { |
318 | /* this situation is very unlikely */ | |
bb009457 | 319 | dev_err(card->dev, "unable to allocate new control numid\n"); |
1da177e4 LT |
320 | return -ENOMEM; |
321 | } | |
1da177e4 LT |
322 | } |
323 | return 0; | |
324 | } | |
325 | ||
326 | /** | |
327 | * snd_ctl_add - add the control instance to the card | |
328 | * @card: the card instance | |
329 | * @kcontrol: the control instance to add | |
330 | * | |
331 | * Adds the control instance created via snd_ctl_new() or | |
332 | * snd_ctl_new1() to the given card. Assigns also an unique | |
333 | * numid used for fast search. | |
334 | * | |
1da177e4 | 335 | * It frees automatically the control which cannot be added. |
eb7c06e8 YB |
336 | * |
337 | * Return: Zero if successful, or a negative error code on failure. | |
338 | * | |
1da177e4 | 339 | */ |
82e9bae6 | 340 | int snd_ctl_add(struct snd_card *card, struct snd_kcontrol *kcontrol) |
1da177e4 | 341 | { |
82e9bae6 | 342 | struct snd_ctl_elem_id id; |
1da177e4 | 343 | unsigned int idx; |
fd9f26e4 | 344 | unsigned int count; |
c6077b30 | 345 | int err = -EINVAL; |
1da177e4 | 346 | |
73e77ba0 | 347 | if (! kcontrol) |
c6077b30 | 348 | return err; |
7eaa943c TI |
349 | if (snd_BUG_ON(!card || !kcontrol->info)) |
350 | goto error; | |
1da177e4 | 351 | id = kcontrol->id; |
883a1d49 LPC |
352 | if (id.index > UINT_MAX - kcontrol->count) |
353 | goto error; | |
354 | ||
1da177e4 LT |
355 | down_write(&card->controls_rwsem); |
356 | if (snd_ctl_find_id(card, &id)) { | |
357 | up_write(&card->controls_rwsem); | |
bb009457 | 358 | dev_err(card->dev, "control %i:%i:%i:%s:%i is already present\n", |
1da177e4 LT |
359 | id.iface, |
360 | id.device, | |
361 | id.subdevice, | |
362 | id.name, | |
363 | id.index); | |
c6077b30 TI |
364 | err = -EBUSY; |
365 | goto error; | |
1da177e4 LT |
366 | } |
367 | if (snd_ctl_find_hole(card, kcontrol->count) < 0) { | |
368 | up_write(&card->controls_rwsem); | |
c6077b30 TI |
369 | err = -ENOMEM; |
370 | goto error; | |
1da177e4 LT |
371 | } |
372 | list_add_tail(&kcontrol->list, &card->controls); | |
373 | card->controls_count += kcontrol->count; | |
374 | kcontrol->id.numid = card->last_numid + 1; | |
375 | card->last_numid += kcontrol->count; | |
fd9f26e4 | 376 | count = kcontrol->count; |
1da177e4 | 377 | up_write(&card->controls_rwsem); |
fd9f26e4 | 378 | for (idx = 0; idx < count; idx++, id.index++, id.numid++) |
1da177e4 LT |
379 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id); |
380 | return 0; | |
c6077b30 TI |
381 | |
382 | error: | |
383 | snd_ctl_free_one(kcontrol); | |
384 | return err; | |
1da177e4 | 385 | } |
c0d3fb39 TI |
386 | EXPORT_SYMBOL(snd_ctl_add); |
387 | ||
66b5b972 DP |
388 | /** |
389 | * snd_ctl_replace - replace the control instance of the card | |
390 | * @card: the card instance | |
391 | * @kcontrol: the control instance to replace | |
392 | * @add_on_replace: add the control if not already added | |
393 | * | |
394 | * Replaces the given control. If the given control does not exist | |
395 | * and the add_on_replace flag is set, the control is added. If the | |
396 | * control exists, it is destroyed first. | |
397 | * | |
66b5b972 | 398 | * It frees automatically the control which cannot be added or replaced. |
eb7c06e8 YB |
399 | * |
400 | * Return: Zero if successful, or a negative error code on failure. | |
66b5b972 DP |
401 | */ |
402 | int snd_ctl_replace(struct snd_card *card, struct snd_kcontrol *kcontrol, | |
403 | bool add_on_replace) | |
404 | { | |
405 | struct snd_ctl_elem_id id; | |
fd9f26e4 | 406 | unsigned int count; |
66b5b972 DP |
407 | unsigned int idx; |
408 | struct snd_kcontrol *old; | |
409 | int ret; | |
410 | ||
411 | if (!kcontrol) | |
412 | return -EINVAL; | |
413 | if (snd_BUG_ON(!card || !kcontrol->info)) { | |
414 | ret = -EINVAL; | |
415 | goto error; | |
416 | } | |
417 | id = kcontrol->id; | |
418 | down_write(&card->controls_rwsem); | |
419 | old = snd_ctl_find_id(card, &id); | |
420 | if (!old) { | |
421 | if (add_on_replace) | |
422 | goto add; | |
423 | up_write(&card->controls_rwsem); | |
424 | ret = -EINVAL; | |
425 | goto error; | |
426 | } | |
427 | ret = snd_ctl_remove(card, old); | |
428 | if (ret < 0) { | |
429 | up_write(&card->controls_rwsem); | |
430 | goto error; | |
431 | } | |
432 | add: | |
433 | if (snd_ctl_find_hole(card, kcontrol->count) < 0) { | |
434 | up_write(&card->controls_rwsem); | |
435 | ret = -ENOMEM; | |
436 | goto error; | |
437 | } | |
438 | list_add_tail(&kcontrol->list, &card->controls); | |
439 | card->controls_count += kcontrol->count; | |
440 | kcontrol->id.numid = card->last_numid + 1; | |
441 | card->last_numid += kcontrol->count; | |
fd9f26e4 | 442 | count = kcontrol->count; |
66b5b972 | 443 | up_write(&card->controls_rwsem); |
fd9f26e4 | 444 | for (idx = 0; idx < count; idx++, id.index++, id.numid++) |
66b5b972 DP |
445 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_ADD, &id); |
446 | return 0; | |
447 | ||
448 | error: | |
449 | snd_ctl_free_one(kcontrol); | |
450 | return ret; | |
451 | } | |
452 | EXPORT_SYMBOL(snd_ctl_replace); | |
453 | ||
1da177e4 LT |
454 | /** |
455 | * snd_ctl_remove - remove the control from the card and release it | |
456 | * @card: the card instance | |
457 | * @kcontrol: the control instance to remove | |
458 | * | |
459 | * Removes the control from the card and then releases the instance. | |
460 | * You don't need to call snd_ctl_free_one(). You must be in | |
461 | * the write lock - down_write(&card->controls_rwsem). | |
eb7c06e8 YB |
462 | * |
463 | * Return: 0 if successful, or a negative error code on failure. | |
1da177e4 | 464 | */ |
82e9bae6 | 465 | int snd_ctl_remove(struct snd_card *card, struct snd_kcontrol *kcontrol) |
1da177e4 | 466 | { |
82e9bae6 | 467 | struct snd_ctl_elem_id id; |
1da177e4 LT |
468 | unsigned int idx; |
469 | ||
7eaa943c TI |
470 | if (snd_BUG_ON(!card || !kcontrol)) |
471 | return -EINVAL; | |
1da177e4 LT |
472 | list_del(&kcontrol->list); |
473 | card->controls_count -= kcontrol->count; | |
474 | id = kcontrol->id; | |
475 | for (idx = 0; idx < kcontrol->count; idx++, id.index++, id.numid++) | |
476 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_REMOVE, &id); | |
477 | snd_ctl_free_one(kcontrol); | |
478 | return 0; | |
479 | } | |
c0d3fb39 TI |
480 | EXPORT_SYMBOL(snd_ctl_remove); |
481 | ||
1da177e4 LT |
482 | /** |
483 | * snd_ctl_remove_id - remove the control of the given id and release it | |
484 | * @card: the card instance | |
485 | * @id: the control id to remove | |
486 | * | |
487 | * Finds the control instance with the given id, removes it from the | |
488 | * card list and releases it. | |
eb7c06e8 YB |
489 | * |
490 | * Return: 0 if successful, or a negative error code on failure. | |
1da177e4 | 491 | */ |
82e9bae6 | 492 | int snd_ctl_remove_id(struct snd_card *card, struct snd_ctl_elem_id *id) |
1da177e4 | 493 | { |
82e9bae6 | 494 | struct snd_kcontrol *kctl; |
1da177e4 LT |
495 | int ret; |
496 | ||
497 | down_write(&card->controls_rwsem); | |
498 | kctl = snd_ctl_find_id(card, id); | |
499 | if (kctl == NULL) { | |
500 | up_write(&card->controls_rwsem); | |
501 | return -ENOENT; | |
502 | } | |
503 | ret = snd_ctl_remove(card, kctl); | |
504 | up_write(&card->controls_rwsem); | |
505 | return ret; | |
506 | } | |
c0d3fb39 TI |
507 | EXPORT_SYMBOL(snd_ctl_remove_id); |
508 | ||
1da177e4 | 509 | /** |
f217ac59 | 510 | * snd_ctl_remove_user_ctl - remove and release the unlocked user control |
1da177e4 LT |
511 | * @file: active control handle |
512 | * @id: the control id to remove | |
513 | * | |
514 | * Finds the control instance with the given id, removes it from the | |
515 | * card list and releases it. | |
eb7c06e8 YB |
516 | * |
517 | * Return: 0 if successful, or a negative error code on failure. | |
1da177e4 | 518 | */ |
f217ac59 CL |
519 | static int snd_ctl_remove_user_ctl(struct snd_ctl_file * file, |
520 | struct snd_ctl_elem_id *id) | |
1da177e4 | 521 | { |
82e9bae6 TI |
522 | struct snd_card *card = file->card; |
523 | struct snd_kcontrol *kctl; | |
1da177e4 LT |
524 | int idx, ret; |
525 | ||
526 | down_write(&card->controls_rwsem); | |
527 | kctl = snd_ctl_find_id(card, id); | |
528 | if (kctl == NULL) { | |
317b8081 CL |
529 | ret = -ENOENT; |
530 | goto error; | |
1da177e4 | 531 | } |
18dd0aa5 CL |
532 | if (!(kctl->vd[0].access & SNDRV_CTL_ELEM_ACCESS_USER)) { |
533 | ret = -EINVAL; | |
534 | goto error; | |
535 | } | |
1da177e4 LT |
536 | for (idx = 0; idx < kctl->count; idx++) |
537 | if (kctl->vd[idx].owner != NULL && kctl->vd[idx].owner != file) { | |
317b8081 CL |
538 | ret = -EBUSY; |
539 | goto error; | |
1da177e4 LT |
540 | } |
541 | ret = snd_ctl_remove(card, kctl); | |
f217ac59 CL |
542 | if (ret < 0) |
543 | goto error; | |
544 | card->user_ctl_count--; | |
317b8081 | 545 | error: |
1da177e4 LT |
546 | up_write(&card->controls_rwsem); |
547 | return ret; | |
548 | } | |
549 | ||
3cbdd753 TI |
550 | /** |
551 | * snd_ctl_activate_id - activate/inactivate the control of the given id | |
552 | * @card: the card instance | |
553 | * @id: the control id to activate/inactivate | |
554 | * @active: non-zero to activate | |
555 | * | |
556 | * Finds the control instance with the given id, and activate or | |
557 | * inactivate the control together with notification, if changed. | |
558 | * | |
eb7c06e8 | 559 | * Return: 0 if unchanged, 1 if changed, or a negative error code on failure. |
3cbdd753 TI |
560 | */ |
561 | int snd_ctl_activate_id(struct snd_card *card, struct snd_ctl_elem_id *id, | |
562 | int active) | |
563 | { | |
564 | struct snd_kcontrol *kctl; | |
565 | struct snd_kcontrol_volatile *vd; | |
566 | unsigned int index_offset; | |
567 | int ret; | |
568 | ||
569 | down_write(&card->controls_rwsem); | |
570 | kctl = snd_ctl_find_id(card, id); | |
571 | if (kctl == NULL) { | |
572 | ret = -ENOENT; | |
573 | goto unlock; | |
574 | } | |
31584ed1 | 575 | index_offset = snd_ctl_get_ioff(kctl, id); |
3cbdd753 TI |
576 | vd = &kctl->vd[index_offset]; |
577 | ret = 0; | |
578 | if (active) { | |
579 | if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE)) | |
580 | goto unlock; | |
581 | vd->access &= ~SNDRV_CTL_ELEM_ACCESS_INACTIVE; | |
582 | } else { | |
583 | if (vd->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE) | |
584 | goto unlock; | |
585 | vd->access |= SNDRV_CTL_ELEM_ACCESS_INACTIVE; | |
586 | } | |
587 | ret = 1; | |
588 | unlock: | |
589 | up_write(&card->controls_rwsem); | |
590 | if (ret > 0) | |
591 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_INFO, id); | |
592 | return ret; | |
593 | } | |
594 | EXPORT_SYMBOL_GPL(snd_ctl_activate_id); | |
595 | ||
1da177e4 LT |
596 | /** |
597 | * snd_ctl_rename_id - replace the id of a control on the card | |
598 | * @card: the card instance | |
599 | * @src_id: the old id | |
600 | * @dst_id: the new id | |
601 | * | |
602 | * Finds the control with the old id from the card, and replaces the | |
603 | * id with the new one. | |
604 | * | |
eb7c06e8 | 605 | * Return: Zero if successful, or a negative error code on failure. |
1da177e4 | 606 | */ |
82e9bae6 TI |
607 | int snd_ctl_rename_id(struct snd_card *card, struct snd_ctl_elem_id *src_id, |
608 | struct snd_ctl_elem_id *dst_id) | |
1da177e4 | 609 | { |
82e9bae6 | 610 | struct snd_kcontrol *kctl; |
1da177e4 LT |
611 | |
612 | down_write(&card->controls_rwsem); | |
613 | kctl = snd_ctl_find_id(card, src_id); | |
614 | if (kctl == NULL) { | |
615 | up_write(&card->controls_rwsem); | |
616 | return -ENOENT; | |
617 | } | |
618 | kctl->id = *dst_id; | |
619 | kctl->id.numid = card->last_numid + 1; | |
620 | card->last_numid += kctl->count; | |
621 | up_write(&card->controls_rwsem); | |
622 | return 0; | |
623 | } | |
c0d3fb39 TI |
624 | EXPORT_SYMBOL(snd_ctl_rename_id); |
625 | ||
1da177e4 LT |
626 | /** |
627 | * snd_ctl_find_numid - find the control instance with the given number-id | |
628 | * @card: the card instance | |
629 | * @numid: the number-id to search | |
630 | * | |
631 | * Finds the control instance with the given number-id from the card. | |
632 | * | |
1da177e4 LT |
633 | * The caller must down card->controls_rwsem before calling this function |
634 | * (if the race condition can happen). | |
eb7c06e8 YB |
635 | * |
636 | * Return: The pointer of the instance if found, or %NULL if not. | |
637 | * | |
1da177e4 | 638 | */ |
82e9bae6 | 639 | struct snd_kcontrol *snd_ctl_find_numid(struct snd_card *card, unsigned int numid) |
1da177e4 | 640 | { |
82e9bae6 | 641 | struct snd_kcontrol *kctl; |
1da177e4 | 642 | |
7eaa943c TI |
643 | if (snd_BUG_ON(!card || !numid)) |
644 | return NULL; | |
9244b2c3 | 645 | list_for_each_entry(kctl, &card->controls, list) { |
1da177e4 LT |
646 | if (kctl->id.numid <= numid && kctl->id.numid + kctl->count > numid) |
647 | return kctl; | |
648 | } | |
649 | return NULL; | |
650 | } | |
c0d3fb39 TI |
651 | EXPORT_SYMBOL(snd_ctl_find_numid); |
652 | ||
1da177e4 LT |
653 | /** |
654 | * snd_ctl_find_id - find the control instance with the given id | |
655 | * @card: the card instance | |
656 | * @id: the id to search | |
657 | * | |
658 | * Finds the control instance with the given id from the card. | |
659 | * | |
1da177e4 LT |
660 | * The caller must down card->controls_rwsem before calling this function |
661 | * (if the race condition can happen). | |
eb7c06e8 YB |
662 | * |
663 | * Return: The pointer of the instance if found, or %NULL if not. | |
664 | * | |
1da177e4 | 665 | */ |
82e9bae6 TI |
666 | struct snd_kcontrol *snd_ctl_find_id(struct snd_card *card, |
667 | struct snd_ctl_elem_id *id) | |
1da177e4 | 668 | { |
82e9bae6 | 669 | struct snd_kcontrol *kctl; |
1da177e4 | 670 | |
7eaa943c TI |
671 | if (snd_BUG_ON(!card || !id)) |
672 | return NULL; | |
1da177e4 LT |
673 | if (id->numid != 0) |
674 | return snd_ctl_find_numid(card, id->numid); | |
9244b2c3 | 675 | list_for_each_entry(kctl, &card->controls, list) { |
1da177e4 LT |
676 | if (kctl->id.iface != id->iface) |
677 | continue; | |
678 | if (kctl->id.device != id->device) | |
679 | continue; | |
680 | if (kctl->id.subdevice != id->subdevice) | |
681 | continue; | |
682 | if (strncmp(kctl->id.name, id->name, sizeof(kctl->id.name))) | |
683 | continue; | |
684 | if (kctl->id.index > id->index) | |
685 | continue; | |
686 | if (kctl->id.index + kctl->count <= id->index) | |
687 | continue; | |
688 | return kctl; | |
689 | } | |
690 | return NULL; | |
691 | } | |
c0d3fb39 TI |
692 | EXPORT_SYMBOL(snd_ctl_find_id); |
693 | ||
82e9bae6 | 694 | static int snd_ctl_card_info(struct snd_card *card, struct snd_ctl_file * ctl, |
1da177e4 LT |
695 | unsigned int cmd, void __user *arg) |
696 | { | |
82e9bae6 | 697 | struct snd_ctl_card_info *info; |
1da177e4 | 698 | |
ca2c0966 | 699 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
1da177e4 LT |
700 | if (! info) |
701 | return -ENOMEM; | |
702 | down_read(&snd_ioctl_rwsem); | |
703 | info->card = card->number; | |
704 | strlcpy(info->id, card->id, sizeof(info->id)); | |
705 | strlcpy(info->driver, card->driver, sizeof(info->driver)); | |
706 | strlcpy(info->name, card->shortname, sizeof(info->name)); | |
707 | strlcpy(info->longname, card->longname, sizeof(info->longname)); | |
708 | strlcpy(info->mixername, card->mixername, sizeof(info->mixername)); | |
709 | strlcpy(info->components, card->components, sizeof(info->components)); | |
710 | up_read(&snd_ioctl_rwsem); | |
82e9bae6 | 711 | if (copy_to_user(arg, info, sizeof(struct snd_ctl_card_info))) { |
1da177e4 LT |
712 | kfree(info); |
713 | return -EFAULT; | |
714 | } | |
715 | kfree(info); | |
716 | return 0; | |
717 | } | |
718 | ||
82e9bae6 TI |
719 | static int snd_ctl_elem_list(struct snd_card *card, |
720 | struct snd_ctl_elem_list __user *_list) | |
1da177e4 LT |
721 | { |
722 | struct list_head *plist; | |
82e9bae6 TI |
723 | struct snd_ctl_elem_list list; |
724 | struct snd_kcontrol *kctl; | |
725 | struct snd_ctl_elem_id *dst, *id; | |
78fa2c4d | 726 | unsigned int offset, space, jidx; |
1da177e4 LT |
727 | |
728 | if (copy_from_user(&list, _list, sizeof(list))) | |
729 | return -EFAULT; | |
730 | offset = list.offset; | |
731 | space = list.space; | |
1da177e4 LT |
732 | /* try limit maximum space */ |
733 | if (space > 16384) | |
734 | return -ENOMEM; | |
735 | if (space > 0) { | |
736 | /* allocate temporary buffer for atomic operation */ | |
82e9bae6 | 737 | dst = vmalloc(space * sizeof(struct snd_ctl_elem_id)); |
1da177e4 LT |
738 | if (dst == NULL) |
739 | return -ENOMEM; | |
740 | down_read(&card->controls_rwsem); | |
741 | list.count = card->controls_count; | |
742 | plist = card->controls.next; | |
743 | while (plist != &card->controls) { | |
744 | if (offset == 0) | |
745 | break; | |
746 | kctl = snd_kcontrol(plist); | |
747 | if (offset < kctl->count) | |
748 | break; | |
749 | offset -= kctl->count; | |
750 | plist = plist->next; | |
751 | } | |
752 | list.used = 0; | |
753 | id = dst; | |
754 | while (space > 0 && plist != &card->controls) { | |
755 | kctl = snd_kcontrol(plist); | |
756 | for (jidx = offset; space > 0 && jidx < kctl->count; jidx++) { | |
757 | snd_ctl_build_ioff(id, kctl, jidx); | |
758 | id++; | |
759 | space--; | |
760 | list.used++; | |
761 | } | |
762 | plist = plist->next; | |
763 | offset = 0; | |
764 | } | |
765 | up_read(&card->controls_rwsem); | |
82e9bae6 TI |
766 | if (list.used > 0 && |
767 | copy_to_user(list.pids, dst, | |
768 | list.used * sizeof(struct snd_ctl_elem_id))) { | |
1da177e4 LT |
769 | vfree(dst); |
770 | return -EFAULT; | |
771 | } | |
772 | vfree(dst); | |
773 | } else { | |
774 | down_read(&card->controls_rwsem); | |
775 | list.count = card->controls_count; | |
776 | up_read(&card->controls_rwsem); | |
777 | } | |
778 | if (copy_to_user(_list, &list, sizeof(list))) | |
779 | return -EFAULT; | |
780 | return 0; | |
781 | } | |
782 | ||
82e9bae6 TI |
783 | static int snd_ctl_elem_info(struct snd_ctl_file *ctl, |
784 | struct snd_ctl_elem_info *info) | |
1da177e4 | 785 | { |
82e9bae6 TI |
786 | struct snd_card *card = ctl->card; |
787 | struct snd_kcontrol *kctl; | |
788 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
789 | unsigned int index_offset; |
790 | int result; | |
791 | ||
792 | down_read(&card->controls_rwsem); | |
793 | kctl = snd_ctl_find_id(card, &info->id); | |
794 | if (kctl == NULL) { | |
795 | up_read(&card->controls_rwsem); | |
796 | return -ENOENT; | |
797 | } | |
798 | #ifdef CONFIG_SND_DEBUG | |
799 | info->access = 0; | |
800 | #endif | |
801 | result = kctl->info(kctl, info); | |
802 | if (result >= 0) { | |
7eaa943c | 803 | snd_BUG_ON(info->access); |
1da177e4 LT |
804 | index_offset = snd_ctl_get_ioff(kctl, &info->id); |
805 | vd = &kctl->vd[index_offset]; | |
806 | snd_ctl_build_ioff(&info->id, kctl, index_offset); | |
807 | info->access = vd->access; | |
808 | if (vd->owner) { | |
809 | info->access |= SNDRV_CTL_ELEM_ACCESS_LOCK; | |
810 | if (vd->owner == ctl) | |
811 | info->access |= SNDRV_CTL_ELEM_ACCESS_OWNER; | |
25d27ede | 812 | info->owner = pid_vnr(vd->owner->pid); |
1da177e4 LT |
813 | } else { |
814 | info->owner = -1; | |
815 | } | |
816 | } | |
817 | up_read(&card->controls_rwsem); | |
818 | return result; | |
819 | } | |
820 | ||
82e9bae6 TI |
821 | static int snd_ctl_elem_info_user(struct snd_ctl_file *ctl, |
822 | struct snd_ctl_elem_info __user *_info) | |
1da177e4 | 823 | { |
82e9bae6 | 824 | struct snd_ctl_elem_info info; |
1da177e4 LT |
825 | int result; |
826 | ||
827 | if (copy_from_user(&info, _info, sizeof(info))) | |
828 | return -EFAULT; | |
64649400 | 829 | snd_power_lock(ctl->card); |
cbac4b0c | 830 | result = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0); |
64649400 GP |
831 | if (result >= 0) |
832 | result = snd_ctl_elem_info(ctl, &info); | |
833 | snd_power_unlock(ctl->card); | |
1da177e4 LT |
834 | if (result >= 0) |
835 | if (copy_to_user(_info, &info, sizeof(info))) | |
836 | return -EFAULT; | |
837 | return result; | |
838 | } | |
839 | ||
d3bd67cd TI |
840 | static int snd_ctl_elem_read(struct snd_card *card, |
841 | struct snd_ctl_elem_value *control) | |
1da177e4 | 842 | { |
82e9bae6 TI |
843 | struct snd_kcontrol *kctl; |
844 | struct snd_kcontrol_volatile *vd; | |
1da177e4 | 845 | unsigned int index_offset; |
8ace4f3c | 846 | int result; |
1da177e4 LT |
847 | |
848 | down_read(&card->controls_rwsem); | |
849 | kctl = snd_ctl_find_id(card, &control->id); | |
850 | if (kctl == NULL) { | |
851 | result = -ENOENT; | |
852 | } else { | |
853 | index_offset = snd_ctl_get_ioff(kctl, &control->id); | |
854 | vd = &kctl->vd[index_offset]; | |
8ace4f3c TI |
855 | if ((vd->access & SNDRV_CTL_ELEM_ACCESS_READ) && |
856 | kctl->get != NULL) { | |
857 | snd_ctl_build_ioff(&control->id, kctl, index_offset); | |
858 | result = kctl->get(kctl, control); | |
859 | } else | |
860 | result = -EPERM; | |
1da177e4 LT |
861 | } |
862 | up_read(&card->controls_rwsem); | |
863 | return result; | |
864 | } | |
865 | ||
82e9bae6 TI |
866 | static int snd_ctl_elem_read_user(struct snd_card *card, |
867 | struct snd_ctl_elem_value __user *_control) | |
1da177e4 | 868 | { |
82e9bae6 | 869 | struct snd_ctl_elem_value *control; |
1da177e4 | 870 | int result; |
ef44a1ec LZ |
871 | |
872 | control = memdup_user(_control, sizeof(*control)); | |
873 | if (IS_ERR(control)) | |
874 | return PTR_ERR(control); | |
875 | ||
64649400 | 876 | snd_power_lock(card); |
cbac4b0c | 877 | result = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
64649400 GP |
878 | if (result >= 0) |
879 | result = snd_ctl_elem_read(card, control); | |
880 | snd_power_unlock(card); | |
1da177e4 LT |
881 | if (result >= 0) |
882 | if (copy_to_user(_control, control, sizeof(*control))) | |
883 | result = -EFAULT; | |
884 | kfree(control); | |
885 | return result; | |
886 | } | |
887 | ||
d3bd67cd TI |
888 | static int snd_ctl_elem_write(struct snd_card *card, struct snd_ctl_file *file, |
889 | struct snd_ctl_elem_value *control) | |
1da177e4 | 890 | { |
82e9bae6 TI |
891 | struct snd_kcontrol *kctl; |
892 | struct snd_kcontrol_volatile *vd; | |
1da177e4 | 893 | unsigned int index_offset; |
8ace4f3c | 894 | int result; |
1da177e4 LT |
895 | |
896 | down_read(&card->controls_rwsem); | |
897 | kctl = snd_ctl_find_id(card, &control->id); | |
898 | if (kctl == NULL) { | |
899 | result = -ENOENT; | |
900 | } else { | |
901 | index_offset = snd_ctl_get_ioff(kctl, &control->id); | |
902 | vd = &kctl->vd[index_offset]; | |
8ace4f3c TI |
903 | if (!(vd->access & SNDRV_CTL_ELEM_ACCESS_WRITE) || |
904 | kctl->put == NULL || | |
905 | (file && vd->owner && vd->owner != file)) { | |
906 | result = -EPERM; | |
1da177e4 | 907 | } else { |
8ace4f3c TI |
908 | snd_ctl_build_ioff(&control->id, kctl, index_offset); |
909 | result = kctl->put(kctl, control); | |
910 | } | |
911 | if (result > 0) { | |
fd9f26e4 | 912 | struct snd_ctl_elem_id id = control->id; |
8ace4f3c | 913 | up_read(&card->controls_rwsem); |
fd9f26e4 | 914 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE, &id); |
8ace4f3c | 915 | return 0; |
1da177e4 LT |
916 | } |
917 | } | |
918 | up_read(&card->controls_rwsem); | |
919 | return result; | |
920 | } | |
921 | ||
82e9bae6 TI |
922 | static int snd_ctl_elem_write_user(struct snd_ctl_file *file, |
923 | struct snd_ctl_elem_value __user *_control) | |
1da177e4 | 924 | { |
82e9bae6 | 925 | struct snd_ctl_elem_value *control; |
64649400 | 926 | struct snd_card *card; |
1da177e4 LT |
927 | int result; |
928 | ||
ef44a1ec LZ |
929 | control = memdup_user(_control, sizeof(*control)); |
930 | if (IS_ERR(control)) | |
931 | return PTR_ERR(control); | |
932 | ||
64649400 GP |
933 | card = file->card; |
934 | snd_power_lock(card); | |
cbac4b0c | 935 | result = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
64649400 GP |
936 | if (result >= 0) |
937 | result = snd_ctl_elem_write(card, file, control); | |
938 | snd_power_unlock(card); | |
1da177e4 LT |
939 | if (result >= 0) |
940 | if (copy_to_user(_control, control, sizeof(*control))) | |
941 | result = -EFAULT; | |
942 | kfree(control); | |
943 | return result; | |
944 | } | |
945 | ||
82e9bae6 TI |
946 | static int snd_ctl_elem_lock(struct snd_ctl_file *file, |
947 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 948 | { |
82e9bae6 TI |
949 | struct snd_card *card = file->card; |
950 | struct snd_ctl_elem_id id; | |
951 | struct snd_kcontrol *kctl; | |
952 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
953 | int result; |
954 | ||
955 | if (copy_from_user(&id, _id, sizeof(id))) | |
956 | return -EFAULT; | |
957 | down_write(&card->controls_rwsem); | |
958 | kctl = snd_ctl_find_id(card, &id); | |
959 | if (kctl == NULL) { | |
960 | result = -ENOENT; | |
961 | } else { | |
962 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; | |
963 | if (vd->owner != NULL) | |
964 | result = -EBUSY; | |
965 | else { | |
966 | vd->owner = file; | |
1da177e4 LT |
967 | result = 0; |
968 | } | |
969 | } | |
970 | up_write(&card->controls_rwsem); | |
971 | return result; | |
972 | } | |
973 | ||
82e9bae6 TI |
974 | static int snd_ctl_elem_unlock(struct snd_ctl_file *file, |
975 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 976 | { |
82e9bae6 TI |
977 | struct snd_card *card = file->card; |
978 | struct snd_ctl_elem_id id; | |
979 | struct snd_kcontrol *kctl; | |
980 | struct snd_kcontrol_volatile *vd; | |
1da177e4 LT |
981 | int result; |
982 | ||
983 | if (copy_from_user(&id, _id, sizeof(id))) | |
984 | return -EFAULT; | |
985 | down_write(&card->controls_rwsem); | |
986 | kctl = snd_ctl_find_id(card, &id); | |
987 | if (kctl == NULL) { | |
988 | result = -ENOENT; | |
989 | } else { | |
990 | vd = &kctl->vd[snd_ctl_get_ioff(kctl, &id)]; | |
991 | if (vd->owner == NULL) | |
992 | result = -EINVAL; | |
993 | else if (vd->owner != file) | |
994 | result = -EPERM; | |
995 | else { | |
996 | vd->owner = NULL; | |
1da177e4 LT |
997 | result = 0; |
998 | } | |
999 | } | |
1000 | up_write(&card->controls_rwsem); | |
1001 | return result; | |
1002 | } | |
1003 | ||
1004 | struct user_element { | |
82e9bae6 | 1005 | struct snd_ctl_elem_info info; |
07f4d9d7 | 1006 | struct snd_card *card; |
1da177e4 LT |
1007 | void *elem_data; /* element data */ |
1008 | unsigned long elem_data_size; /* size of element data in bytes */ | |
8aa9b586 JK |
1009 | void *tlv_data; /* TLV data */ |
1010 | unsigned long tlv_data_size; /* TLV data size */ | |
1da177e4 | 1011 | void *priv_data; /* private data (like strings for enumerated type) */ |
1da177e4 LT |
1012 | }; |
1013 | ||
82e9bae6 TI |
1014 | static int snd_ctl_elem_user_info(struct snd_kcontrol *kcontrol, |
1015 | struct snd_ctl_elem_info *uinfo) | |
1da177e4 LT |
1016 | { |
1017 | struct user_element *ue = kcontrol->private_data; | |
1018 | ||
1019 | *uinfo = ue->info; | |
1020 | return 0; | |
1021 | } | |
1022 | ||
8d448162 CL |
1023 | static int snd_ctl_elem_user_enum_info(struct snd_kcontrol *kcontrol, |
1024 | struct snd_ctl_elem_info *uinfo) | |
1025 | { | |
1026 | struct user_element *ue = kcontrol->private_data; | |
1027 | const char *names; | |
1028 | unsigned int item; | |
1029 | ||
1030 | item = uinfo->value.enumerated.item; | |
1031 | ||
1032 | *uinfo = ue->info; | |
1033 | ||
1034 | item = min(item, uinfo->value.enumerated.items - 1); | |
1035 | uinfo->value.enumerated.item = item; | |
1036 | ||
1037 | names = ue->priv_data; | |
1038 | for (; item > 0; --item) | |
1039 | names += strlen(names) + 1; | |
1040 | strcpy(uinfo->value.enumerated.name, names); | |
1041 | ||
1042 | return 0; | |
1043 | } | |
1044 | ||
82e9bae6 TI |
1045 | static int snd_ctl_elem_user_get(struct snd_kcontrol *kcontrol, |
1046 | struct snd_ctl_elem_value *ucontrol) | |
1da177e4 LT |
1047 | { |
1048 | struct user_element *ue = kcontrol->private_data; | |
1049 | ||
07f4d9d7 | 1050 | mutex_lock(&ue->card->user_ctl_lock); |
1da177e4 | 1051 | memcpy(&ucontrol->value, ue->elem_data, ue->elem_data_size); |
07f4d9d7 | 1052 | mutex_unlock(&ue->card->user_ctl_lock); |
1da177e4 LT |
1053 | return 0; |
1054 | } | |
1055 | ||
82e9bae6 TI |
1056 | static int snd_ctl_elem_user_put(struct snd_kcontrol *kcontrol, |
1057 | struct snd_ctl_elem_value *ucontrol) | |
1da177e4 LT |
1058 | { |
1059 | int change; | |
1060 | struct user_element *ue = kcontrol->private_data; | |
07f4d9d7 LPC |
1061 | |
1062 | mutex_lock(&ue->card->user_ctl_lock); | |
1da177e4 LT |
1063 | change = memcmp(&ucontrol->value, ue->elem_data, ue->elem_data_size) != 0; |
1064 | if (change) | |
1065 | memcpy(ue->elem_data, &ucontrol->value, ue->elem_data_size); | |
07f4d9d7 | 1066 | mutex_unlock(&ue->card->user_ctl_lock); |
1da177e4 LT |
1067 | return change; |
1068 | } | |
1069 | ||
8aa9b586 JK |
1070 | static int snd_ctl_elem_user_tlv(struct snd_kcontrol *kcontrol, |
1071 | int op_flag, | |
1072 | unsigned int size, | |
1073 | unsigned int __user *tlv) | |
1074 | { | |
1075 | struct user_element *ue = kcontrol->private_data; | |
1076 | int change = 0; | |
1077 | void *new_data; | |
1078 | ||
1079 | if (op_flag > 0) { | |
1080 | if (size > 1024 * 128) /* sane value */ | |
1081 | return -EINVAL; | |
ef44a1ec LZ |
1082 | |
1083 | new_data = memdup_user(tlv, size); | |
1084 | if (IS_ERR(new_data)) | |
1085 | return PTR_ERR(new_data); | |
07f4d9d7 | 1086 | mutex_lock(&ue->card->user_ctl_lock); |
8aa9b586 JK |
1087 | change = ue->tlv_data_size != size; |
1088 | if (!change) | |
1089 | change = memcmp(ue->tlv_data, new_data, size); | |
1090 | kfree(ue->tlv_data); | |
1091 | ue->tlv_data = new_data; | |
1092 | ue->tlv_data_size = size; | |
07f4d9d7 | 1093 | mutex_unlock(&ue->card->user_ctl_lock); |
8aa9b586 | 1094 | } else { |
07f4d9d7 LPC |
1095 | int ret = 0; |
1096 | ||
1097 | mutex_lock(&ue->card->user_ctl_lock); | |
1098 | if (!ue->tlv_data_size || !ue->tlv_data) { | |
1099 | ret = -ENXIO; | |
1100 | goto err_unlock; | |
1101 | } | |
1102 | if (size < ue->tlv_data_size) { | |
1103 | ret = -ENOSPC; | |
1104 | goto err_unlock; | |
1105 | } | |
8aa9b586 | 1106 | if (copy_to_user(tlv, ue->tlv_data, ue->tlv_data_size)) |
07f4d9d7 LPC |
1107 | ret = -EFAULT; |
1108 | err_unlock: | |
1109 | mutex_unlock(&ue->card->user_ctl_lock); | |
1110 | if (ret) | |
1111 | return ret; | |
8aa9b586 JK |
1112 | } |
1113 | return change; | |
1114 | } | |
1115 | ||
8d448162 CL |
1116 | static int snd_ctl_elem_init_enum_names(struct user_element *ue) |
1117 | { | |
1118 | char *names, *p; | |
1119 | size_t buf_len, name_len; | |
1120 | unsigned int i; | |
447c6f93 | 1121 | const uintptr_t user_ptrval = ue->info.value.enumerated.names_ptr; |
8d448162 CL |
1122 | |
1123 | if (ue->info.value.enumerated.names_length > 64 * 1024) | |
1124 | return -EINVAL; | |
1125 | ||
447c6f93 | 1126 | names = memdup_user((const void __user *)user_ptrval, |
8d448162 CL |
1127 | ue->info.value.enumerated.names_length); |
1128 | if (IS_ERR(names)) | |
1129 | return PTR_ERR(names); | |
1130 | ||
1131 | /* check that there are enough valid names */ | |
1132 | buf_len = ue->info.value.enumerated.names_length; | |
1133 | p = names; | |
1134 | for (i = 0; i < ue->info.value.enumerated.items; ++i) { | |
1135 | name_len = strnlen(p, buf_len); | |
1136 | if (name_len == 0 || name_len >= 64 || name_len == buf_len) { | |
1137 | kfree(names); | |
1138 | return -EINVAL; | |
1139 | } | |
1140 | p += name_len + 1; | |
1141 | buf_len -= name_len + 1; | |
1142 | } | |
1143 | ||
1144 | ue->priv_data = names; | |
1145 | ue->info.value.enumerated.names_ptr = 0; | |
1146 | ||
1147 | return 0; | |
1148 | } | |
1149 | ||
82e9bae6 | 1150 | static void snd_ctl_elem_user_free(struct snd_kcontrol *kcontrol) |
1da177e4 | 1151 | { |
8aa9b586 | 1152 | struct user_element *ue = kcontrol->private_data; |
8d448162 CL |
1153 | |
1154 | kfree(ue->tlv_data); | |
1155 | kfree(ue->priv_data); | |
8aa9b586 | 1156 | kfree(ue); |
1da177e4 LT |
1157 | } |
1158 | ||
82e9bae6 TI |
1159 | static int snd_ctl_elem_add(struct snd_ctl_file *file, |
1160 | struct snd_ctl_elem_info *info, int replace) | |
1da177e4 | 1161 | { |
82e9bae6 TI |
1162 | struct snd_card *card = file->card; |
1163 | struct snd_kcontrol kctl, *_kctl; | |
1da177e4 LT |
1164 | unsigned int access; |
1165 | long private_size; | |
1166 | struct user_element *ue; | |
1167 | int idx, err; | |
983929ca | 1168 | |
2a031aed | 1169 | if (info->count < 1) |
1da177e4 LT |
1170 | return -EINVAL; |
1171 | access = info->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE : | |
82e9bae6 | 1172 | (info->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE| |
8aa9b586 JK |
1173 | SNDRV_CTL_ELEM_ACCESS_INACTIVE| |
1174 | SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE)); | |
1da177e4 LT |
1175 | info->id.numid = 0; |
1176 | memset(&kctl, 0, sizeof(kctl)); | |
82262a46 LPC |
1177 | |
1178 | if (replace) { | |
1179 | err = snd_ctl_remove_user_ctl(file, &info->id); | |
1180 | if (err) | |
1181 | return err; | |
1da177e4 | 1182 | } |
82262a46 LPC |
1183 | |
1184 | if (card->user_ctl_count >= MAX_USER_CONTROLS) | |
1185 | return -ENOMEM; | |
1186 | ||
1da177e4 LT |
1187 | memcpy(&kctl.id, &info->id, sizeof(info->id)); |
1188 | kctl.count = info->owner ? info->owner : 1; | |
1189 | access |= SNDRV_CTL_ELEM_ACCESS_USER; | |
8d448162 CL |
1190 | if (info->type == SNDRV_CTL_ELEM_TYPE_ENUMERATED) |
1191 | kctl.info = snd_ctl_elem_user_enum_info; | |
1192 | else | |
1193 | kctl.info = snd_ctl_elem_user_info; | |
1da177e4 LT |
1194 | if (access & SNDRV_CTL_ELEM_ACCESS_READ) |
1195 | kctl.get = snd_ctl_elem_user_get; | |
1196 | if (access & SNDRV_CTL_ELEM_ACCESS_WRITE) | |
1197 | kctl.put = snd_ctl_elem_user_put; | |
8aa9b586 JK |
1198 | if (access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE) { |
1199 | kctl.tlv.c = snd_ctl_elem_user_tlv; | |
1200 | access |= SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK; | |
1201 | } | |
1da177e4 LT |
1202 | switch (info->type) { |
1203 | case SNDRV_CTL_ELEM_TYPE_BOOLEAN: | |
1da177e4 LT |
1204 | case SNDRV_CTL_ELEM_TYPE_INTEGER: |
1205 | private_size = sizeof(long); | |
1206 | if (info->count > 128) | |
1207 | return -EINVAL; | |
1208 | break; | |
1209 | case SNDRV_CTL_ELEM_TYPE_INTEGER64: | |
1210 | private_size = sizeof(long long); | |
1211 | if (info->count > 64) | |
1212 | return -EINVAL; | |
1213 | break; | |
8d448162 CL |
1214 | case SNDRV_CTL_ELEM_TYPE_ENUMERATED: |
1215 | private_size = sizeof(unsigned int); | |
1216 | if (info->count > 128 || info->value.enumerated.items == 0) | |
1217 | return -EINVAL; | |
1218 | break; | |
1da177e4 LT |
1219 | case SNDRV_CTL_ELEM_TYPE_BYTES: |
1220 | private_size = sizeof(unsigned char); | |
1221 | if (info->count > 512) | |
1222 | return -EINVAL; | |
1223 | break; | |
1224 | case SNDRV_CTL_ELEM_TYPE_IEC958: | |
82e9bae6 | 1225 | private_size = sizeof(struct snd_aes_iec958); |
1da177e4 LT |
1226 | if (info->count != 1) |
1227 | return -EINVAL; | |
1228 | break; | |
1229 | default: | |
1230 | return -EINVAL; | |
1231 | } | |
1232 | private_size *= info->count; | |
ca2c0966 | 1233 | ue = kzalloc(sizeof(struct user_element) + private_size, GFP_KERNEL); |
1da177e4 LT |
1234 | if (ue == NULL) |
1235 | return -ENOMEM; | |
07f4d9d7 | 1236 | ue->card = card; |
1da177e4 | 1237 | ue->info = *info; |
86148e84 | 1238 | ue->info.access = 0; |
1da177e4 LT |
1239 | ue->elem_data = (char *)ue + sizeof(*ue); |
1240 | ue->elem_data_size = private_size; | |
8d448162 CL |
1241 | if (ue->info.type == SNDRV_CTL_ELEM_TYPE_ENUMERATED) { |
1242 | err = snd_ctl_elem_init_enum_names(ue); | |
1243 | if (err < 0) { | |
1244 | kfree(ue); | |
1245 | return err; | |
1246 | } | |
1247 | } | |
1da177e4 LT |
1248 | kctl.private_free = snd_ctl_elem_user_free; |
1249 | _kctl = snd_ctl_new(&kctl, access); | |
1250 | if (_kctl == NULL) { | |
8d448162 | 1251 | kfree(ue->priv_data); |
2fbf182e | 1252 | kfree(ue); |
1da177e4 LT |
1253 | return -ENOMEM; |
1254 | } | |
1255 | _kctl->private_data = ue; | |
1256 | for (idx = 0; idx < _kctl->count; idx++) | |
1257 | _kctl->vd[idx].owner = file; | |
1258 | err = snd_ctl_add(card, _kctl); | |
2fbf182e | 1259 | if (err < 0) |
1da177e4 | 1260 | return err; |
1da177e4 LT |
1261 | |
1262 | down_write(&card->controls_rwsem); | |
1263 | card->user_ctl_count++; | |
1264 | up_write(&card->controls_rwsem); | |
1265 | ||
1266 | return 0; | |
1267 | } | |
1268 | ||
82e9bae6 TI |
1269 | static int snd_ctl_elem_add_user(struct snd_ctl_file *file, |
1270 | struct snd_ctl_elem_info __user *_info, int replace) | |
1da177e4 | 1271 | { |
82e9bae6 | 1272 | struct snd_ctl_elem_info info; |
1da177e4 LT |
1273 | if (copy_from_user(&info, _info, sizeof(info))) |
1274 | return -EFAULT; | |
1275 | return snd_ctl_elem_add(file, &info, replace); | |
1276 | } | |
1277 | ||
82e9bae6 TI |
1278 | static int snd_ctl_elem_remove(struct snd_ctl_file *file, |
1279 | struct snd_ctl_elem_id __user *_id) | |
1da177e4 | 1280 | { |
82e9bae6 | 1281 | struct snd_ctl_elem_id id; |
1da177e4 LT |
1282 | |
1283 | if (copy_from_user(&id, _id, sizeof(id))) | |
1284 | return -EFAULT; | |
f217ac59 | 1285 | return snd_ctl_remove_user_ctl(file, &id); |
1da177e4 LT |
1286 | } |
1287 | ||
82e9bae6 | 1288 | static int snd_ctl_subscribe_events(struct snd_ctl_file *file, int __user *ptr) |
1da177e4 LT |
1289 | { |
1290 | int subscribe; | |
1291 | if (get_user(subscribe, ptr)) | |
1292 | return -EFAULT; | |
1293 | if (subscribe < 0) { | |
1294 | subscribe = file->subscribed; | |
1295 | if (put_user(subscribe, ptr)) | |
1296 | return -EFAULT; | |
1297 | return 0; | |
1298 | } | |
1299 | if (subscribe) { | |
1300 | file->subscribed = 1; | |
1301 | return 0; | |
1302 | } else if (file->subscribed) { | |
1303 | snd_ctl_empty_read_queue(file); | |
1304 | file->subscribed = 0; | |
1305 | } | |
1306 | return 0; | |
1307 | } | |
1308 | ||
8aa9b586 JK |
1309 | static int snd_ctl_tlv_ioctl(struct snd_ctl_file *file, |
1310 | struct snd_ctl_tlv __user *_tlv, | |
1311 | int op_flag) | |
42750b04 | 1312 | { |
8aa9b586 | 1313 | struct snd_card *card = file->card; |
42750b04 JK |
1314 | struct snd_ctl_tlv tlv; |
1315 | struct snd_kcontrol *kctl; | |
8aa9b586 | 1316 | struct snd_kcontrol_volatile *vd; |
42750b04 JK |
1317 | unsigned int len; |
1318 | int err = 0; | |
1319 | ||
1320 | if (copy_from_user(&tlv, _tlv, sizeof(tlv))) | |
1321 | return -EFAULT; | |
6123637f | 1322 | if (tlv.length < sizeof(unsigned int) * 2) |
8aa9b586 JK |
1323 | return -EINVAL; |
1324 | down_read(&card->controls_rwsem); | |
1325 | kctl = snd_ctl_find_numid(card, tlv.numid); | |
1326 | if (kctl == NULL) { | |
1327 | err = -ENOENT; | |
1328 | goto __kctl_end; | |
1329 | } | |
1330 | if (kctl->tlv.p == NULL) { | |
1331 | err = -ENXIO; | |
1332 | goto __kctl_end; | |
1333 | } | |
1334 | vd = &kctl->vd[tlv.numid - kctl->id.numid]; | |
1335 | if ((op_flag == 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_READ) == 0) || | |
1336 | (op_flag > 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE) == 0) || | |
1337 | (op_flag < 0 && (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND) == 0)) { | |
1338 | err = -ENXIO; | |
1339 | goto __kctl_end; | |
1340 | } | |
1341 | if (vd->access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) { | |
bec145ae | 1342 | if (vd->owner != NULL && vd->owner != file) { |
8aa9b586 JK |
1343 | err = -EPERM; |
1344 | goto __kctl_end; | |
1345 | } | |
bd483d4c | 1346 | err = kctl->tlv.c(kctl, op_flag, tlv.length, _tlv->tlv); |
8aa9b586 | 1347 | if (err > 0) { |
fd9f26e4 | 1348 | struct snd_ctl_elem_id id = kctl->id; |
8aa9b586 | 1349 | up_read(&card->controls_rwsem); |
fd9f26e4 | 1350 | snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_TLV, &id); |
8aa9b586 JK |
1351 | return 0; |
1352 | } | |
1353 | } else { | |
1354 | if (op_flag) { | |
1355 | err = -ENXIO; | |
1356 | goto __kctl_end; | |
1357 | } | |
1358 | len = kctl->tlv.p[1] + 2 * sizeof(unsigned int); | |
1359 | if (tlv.length < len) { | |
1360 | err = -ENOMEM; | |
1361 | goto __kctl_end; | |
1362 | } | |
1363 | if (copy_to_user(_tlv->tlv, kctl->tlv.p, len)) | |
1364 | err = -EFAULT; | |
1365 | } | |
42750b04 | 1366 | __kctl_end: |
8aa9b586 JK |
1367 | up_read(&card->controls_rwsem); |
1368 | return err; | |
42750b04 JK |
1369 | } |
1370 | ||
1da177e4 LT |
1371 | static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1372 | { | |
82e9bae6 TI |
1373 | struct snd_ctl_file *ctl; |
1374 | struct snd_card *card; | |
82e9bae6 | 1375 | struct snd_kctl_ioctl *p; |
1da177e4 LT |
1376 | void __user *argp = (void __user *)arg; |
1377 | int __user *ip = argp; | |
1378 | int err; | |
1379 | ||
1380 | ctl = file->private_data; | |
1381 | card = ctl->card; | |
7eaa943c TI |
1382 | if (snd_BUG_ON(!card)) |
1383 | return -ENXIO; | |
1da177e4 LT |
1384 | switch (cmd) { |
1385 | case SNDRV_CTL_IOCTL_PVERSION: | |
1386 | return put_user(SNDRV_CTL_VERSION, ip) ? -EFAULT : 0; | |
1387 | case SNDRV_CTL_IOCTL_CARD_INFO: | |
1388 | return snd_ctl_card_info(card, ctl, cmd, argp); | |
1389 | case SNDRV_CTL_IOCTL_ELEM_LIST: | |
42750b04 | 1390 | return snd_ctl_elem_list(card, argp); |
1da177e4 LT |
1391 | case SNDRV_CTL_IOCTL_ELEM_INFO: |
1392 | return snd_ctl_elem_info_user(ctl, argp); | |
1393 | case SNDRV_CTL_IOCTL_ELEM_READ: | |
42750b04 | 1394 | return snd_ctl_elem_read_user(card, argp); |
1da177e4 LT |
1395 | case SNDRV_CTL_IOCTL_ELEM_WRITE: |
1396 | return snd_ctl_elem_write_user(ctl, argp); | |
1397 | case SNDRV_CTL_IOCTL_ELEM_LOCK: | |
1398 | return snd_ctl_elem_lock(ctl, argp); | |
1399 | case SNDRV_CTL_IOCTL_ELEM_UNLOCK: | |
1400 | return snd_ctl_elem_unlock(ctl, argp); | |
1401 | case SNDRV_CTL_IOCTL_ELEM_ADD: | |
1402 | return snd_ctl_elem_add_user(ctl, argp, 0); | |
1403 | case SNDRV_CTL_IOCTL_ELEM_REPLACE: | |
1404 | return snd_ctl_elem_add_user(ctl, argp, 1); | |
1405 | case SNDRV_CTL_IOCTL_ELEM_REMOVE: | |
1406 | return snd_ctl_elem_remove(ctl, argp); | |
1407 | case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS: | |
1408 | return snd_ctl_subscribe_events(ctl, ip); | |
8aa9b586 | 1409 | case SNDRV_CTL_IOCTL_TLV_READ: |
0cea76f3 | 1410 | return snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_READ); |
8aa9b586 | 1411 | case SNDRV_CTL_IOCTL_TLV_WRITE: |
0cea76f3 | 1412 | return snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_WRITE); |
8aa9b586 | 1413 | case SNDRV_CTL_IOCTL_TLV_COMMAND: |
0cea76f3 | 1414 | return snd_ctl_tlv_ioctl(ctl, argp, SNDRV_CTL_TLV_OP_CMD); |
1da177e4 | 1415 | case SNDRV_CTL_IOCTL_POWER: |
a381a7a6 | 1416 | return -ENOPROTOOPT; |
1da177e4 LT |
1417 | case SNDRV_CTL_IOCTL_POWER_STATE: |
1418 | #ifdef CONFIG_PM | |
1419 | return put_user(card->power_state, ip) ? -EFAULT : 0; | |
1420 | #else | |
1421 | return put_user(SNDRV_CTL_POWER_D0, ip) ? -EFAULT : 0; | |
1422 | #endif | |
1423 | } | |
1424 | down_read(&snd_ioctl_rwsem); | |
9244b2c3 | 1425 | list_for_each_entry(p, &snd_control_ioctls, list) { |
1da177e4 LT |
1426 | err = p->fioctl(card, ctl, cmd, arg); |
1427 | if (err != -ENOIOCTLCMD) { | |
1428 | up_read(&snd_ioctl_rwsem); | |
1429 | return err; | |
1430 | } | |
1431 | } | |
1432 | up_read(&snd_ioctl_rwsem); | |
bb009457 | 1433 | dev_dbg(card->dev, "unknown ioctl = 0x%x\n", cmd); |
1da177e4 LT |
1434 | return -ENOTTY; |
1435 | } | |
1436 | ||
82e9bae6 TI |
1437 | static ssize_t snd_ctl_read(struct file *file, char __user *buffer, |
1438 | size_t count, loff_t * offset) | |
1da177e4 | 1439 | { |
82e9bae6 | 1440 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1441 | int err = 0; |
1442 | ssize_t result = 0; | |
1443 | ||
1444 | ctl = file->private_data; | |
7eaa943c TI |
1445 | if (snd_BUG_ON(!ctl || !ctl->card)) |
1446 | return -ENXIO; | |
1da177e4 LT |
1447 | if (!ctl->subscribed) |
1448 | return -EBADFD; | |
82e9bae6 | 1449 | if (count < sizeof(struct snd_ctl_event)) |
1da177e4 LT |
1450 | return -EINVAL; |
1451 | spin_lock_irq(&ctl->read_lock); | |
82e9bae6 TI |
1452 | while (count >= sizeof(struct snd_ctl_event)) { |
1453 | struct snd_ctl_event ev; | |
1454 | struct snd_kctl_event *kev; | |
1da177e4 LT |
1455 | while (list_empty(&ctl->events)) { |
1456 | wait_queue_t wait; | |
1457 | if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) { | |
1458 | err = -EAGAIN; | |
1459 | goto __end_lock; | |
1460 | } | |
1461 | init_waitqueue_entry(&wait, current); | |
1462 | add_wait_queue(&ctl->change_sleep, &wait); | |
1463 | set_current_state(TASK_INTERRUPTIBLE); | |
1464 | spin_unlock_irq(&ctl->read_lock); | |
1465 | schedule(); | |
1466 | remove_wait_queue(&ctl->change_sleep, &wait); | |
0914f796 TI |
1467 | if (ctl->card->shutdown) |
1468 | return -ENODEV; | |
1da177e4 | 1469 | if (signal_pending(current)) |
0e5d720c | 1470 | return -ERESTARTSYS; |
1da177e4 LT |
1471 | spin_lock_irq(&ctl->read_lock); |
1472 | } | |
1473 | kev = snd_kctl_event(ctl->events.next); | |
1474 | ev.type = SNDRV_CTL_EVENT_ELEM; | |
1475 | ev.data.elem.mask = kev->mask; | |
1476 | ev.data.elem.id = kev->id; | |
1477 | list_del(&kev->list); | |
1478 | spin_unlock_irq(&ctl->read_lock); | |
1479 | kfree(kev); | |
82e9bae6 | 1480 | if (copy_to_user(buffer, &ev, sizeof(struct snd_ctl_event))) { |
1da177e4 LT |
1481 | err = -EFAULT; |
1482 | goto __end; | |
1483 | } | |
1484 | spin_lock_irq(&ctl->read_lock); | |
82e9bae6 TI |
1485 | buffer += sizeof(struct snd_ctl_event); |
1486 | count -= sizeof(struct snd_ctl_event); | |
1487 | result += sizeof(struct snd_ctl_event); | |
1da177e4 LT |
1488 | } |
1489 | __end_lock: | |
1490 | spin_unlock_irq(&ctl->read_lock); | |
1491 | __end: | |
1492 | return result > 0 ? result : err; | |
1493 | } | |
1494 | ||
1495 | static unsigned int snd_ctl_poll(struct file *file, poll_table * wait) | |
1496 | { | |
1497 | unsigned int mask; | |
82e9bae6 | 1498 | struct snd_ctl_file *ctl; |
1da177e4 LT |
1499 | |
1500 | ctl = file->private_data; | |
1501 | if (!ctl->subscribed) | |
1502 | return 0; | |
1503 | poll_wait(file, &ctl->change_sleep, wait); | |
1504 | ||
1505 | mask = 0; | |
1506 | if (!list_empty(&ctl->events)) | |
1507 | mask |= POLLIN | POLLRDNORM; | |
1508 | ||
1509 | return mask; | |
1510 | } | |
1511 | ||
1512 | /* | |
1513 | * register the device-specific control-ioctls. | |
1514 | * called from each device manager like pcm.c, hwdep.c, etc. | |
1515 | */ | |
1516 | static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists) | |
1517 | { | |
82e9bae6 | 1518 | struct snd_kctl_ioctl *pn; |
1da177e4 | 1519 | |
82e9bae6 | 1520 | pn = kzalloc(sizeof(struct snd_kctl_ioctl), GFP_KERNEL); |
1da177e4 LT |
1521 | if (pn == NULL) |
1522 | return -ENOMEM; | |
1523 | pn->fioctl = fcn; | |
1524 | down_write(&snd_ioctl_rwsem); | |
1525 | list_add_tail(&pn->list, lists); | |
1526 | up_write(&snd_ioctl_rwsem); | |
1527 | return 0; | |
1528 | } | |
1529 | ||
12cddbd8 TI |
1530 | /** |
1531 | * snd_ctl_register_ioctl - register the device-specific control-ioctls | |
1532 | * @fcn: ioctl callback function | |
1533 | * | |
1534 | * called from each device manager like pcm.c, hwdep.c, etc. | |
1535 | */ | |
1da177e4 LT |
1536 | int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn) |
1537 | { | |
1538 | return _snd_ctl_register_ioctl(fcn, &snd_control_ioctls); | |
1539 | } | |
c0d3fb39 TI |
1540 | EXPORT_SYMBOL(snd_ctl_register_ioctl); |
1541 | ||
1da177e4 | 1542 | #ifdef CONFIG_COMPAT |
12cddbd8 TI |
1543 | /** |
1544 | * snd_ctl_register_ioctl_compat - register the device-specific 32bit compat | |
1545 | * control-ioctls | |
1546 | * @fcn: ioctl callback function | |
1547 | */ | |
1da177e4 LT |
1548 | int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn) |
1549 | { | |
1550 | return _snd_ctl_register_ioctl(fcn, &snd_control_compat_ioctls); | |
1551 | } | |
c0d3fb39 | 1552 | EXPORT_SYMBOL(snd_ctl_register_ioctl_compat); |
1da177e4 LT |
1553 | #endif |
1554 | ||
1555 | /* | |
1556 | * de-register the device-specific control-ioctls. | |
1557 | */ | |
82e9bae6 TI |
1558 | static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn, |
1559 | struct list_head *lists) | |
1da177e4 | 1560 | { |
82e9bae6 | 1561 | struct snd_kctl_ioctl *p; |
1da177e4 | 1562 | |
7eaa943c TI |
1563 | if (snd_BUG_ON(!fcn)) |
1564 | return -EINVAL; | |
1da177e4 | 1565 | down_write(&snd_ioctl_rwsem); |
9244b2c3 | 1566 | list_for_each_entry(p, lists, list) { |
1da177e4 LT |
1567 | if (p->fioctl == fcn) { |
1568 | list_del(&p->list); | |
1569 | up_write(&snd_ioctl_rwsem); | |
1570 | kfree(p); | |
1571 | return 0; | |
1572 | } | |
1573 | } | |
1574 | up_write(&snd_ioctl_rwsem); | |
1575 | snd_BUG(); | |
1576 | return -EINVAL; | |
1577 | } | |
1578 | ||
12cddbd8 TI |
1579 | /** |
1580 | * snd_ctl_unregister_ioctl - de-register the device-specific control-ioctls | |
1581 | * @fcn: ioctl callback function to unregister | |
1582 | */ | |
1da177e4 LT |
1583 | int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn) |
1584 | { | |
1585 | return _snd_ctl_unregister_ioctl(fcn, &snd_control_ioctls); | |
1586 | } | |
c0d3fb39 TI |
1587 | EXPORT_SYMBOL(snd_ctl_unregister_ioctl); |
1588 | ||
1da177e4 | 1589 | #ifdef CONFIG_COMPAT |
12cddbd8 TI |
1590 | /** |
1591 | * snd_ctl_unregister_ioctl - de-register the device-specific compat 32bit | |
1592 | * control-ioctls | |
1593 | * @fcn: ioctl callback function to unregister | |
1594 | */ | |
1da177e4 LT |
1595 | int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn) |
1596 | { | |
1597 | return _snd_ctl_unregister_ioctl(fcn, &snd_control_compat_ioctls); | |
1598 | } | |
c0d3fb39 | 1599 | EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat); |
1da177e4 LT |
1600 | #endif |
1601 | ||
1602 | static int snd_ctl_fasync(int fd, struct file * file, int on) | |
1603 | { | |
82e9bae6 | 1604 | struct snd_ctl_file *ctl; |
60aa4924 | 1605 | |
1da177e4 | 1606 | ctl = file->private_data; |
60aa4924 | 1607 | return fasync_helper(fd, file, on, &ctl->fasync); |
1da177e4 LT |
1608 | } |
1609 | ||
23c18d4b TI |
1610 | /* return the preferred subdevice number if already assigned; |
1611 | * otherwise return -1 | |
1612 | */ | |
1613 | int snd_ctl_get_preferred_subdevice(struct snd_card *card, int type) | |
1614 | { | |
1615 | struct snd_ctl_file *kctl; | |
1616 | int subdevice = -1; | |
1617 | ||
1618 | read_lock(&card->ctl_files_rwlock); | |
1619 | list_for_each_entry(kctl, &card->ctl_files, list) { | |
1620 | if (kctl->pid == task_pid(current)) { | |
1621 | subdevice = kctl->preferred_subdevice[type]; | |
1622 | if (subdevice != -1) | |
1623 | break; | |
1624 | } | |
1625 | } | |
1626 | read_unlock(&card->ctl_files_rwlock); | |
1627 | return subdevice; | |
1628 | } | |
1629 | EXPORT_SYMBOL_GPL(snd_ctl_get_preferred_subdevice); | |
1630 | ||
1da177e4 LT |
1631 | /* |
1632 | * ioctl32 compat | |
1633 | */ | |
1634 | #ifdef CONFIG_COMPAT | |
1635 | #include "control_compat.c" | |
1636 | #else | |
1637 | #define snd_ctl_ioctl_compat NULL | |
1638 | #endif | |
1639 | ||
1640 | /* | |
1641 | * INIT PART | |
1642 | */ | |
1643 | ||
9c2e08c5 | 1644 | static const struct file_operations snd_ctl_f_ops = |
1da177e4 LT |
1645 | { |
1646 | .owner = THIS_MODULE, | |
1647 | .read = snd_ctl_read, | |
1648 | .open = snd_ctl_open, | |
1649 | .release = snd_ctl_release, | |
02f4865f | 1650 | .llseek = no_llseek, |
1da177e4 LT |
1651 | .poll = snd_ctl_poll, |
1652 | .unlocked_ioctl = snd_ctl_ioctl, | |
1653 | .compat_ioctl = snd_ctl_ioctl_compat, | |
1654 | .fasync = snd_ctl_fasync, | |
1655 | }; | |
1656 | ||
1da177e4 LT |
1657 | /* |
1658 | * registration of the control device | |
1659 | */ | |
82e9bae6 | 1660 | static int snd_ctl_dev_register(struct snd_device *device) |
1da177e4 | 1661 | { |
82e9bae6 | 1662 | struct snd_card *card = device->device_data; |
1da177e4 | 1663 | |
40a4b263 TI |
1664 | return snd_register_device(SNDRV_DEVICE_TYPE_CONTROL, card, -1, |
1665 | &snd_ctl_f_ops, card, &card->ctl_dev); | |
1da177e4 LT |
1666 | } |
1667 | ||
1668 | /* | |
1669 | * disconnection of the control device | |
1670 | */ | |
82e9bae6 | 1671 | static int snd_ctl_dev_disconnect(struct snd_device *device) |
1da177e4 | 1672 | { |
82e9bae6 | 1673 | struct snd_card *card = device->device_data; |
82e9bae6 | 1674 | struct snd_ctl_file *ctl; |
1da177e4 | 1675 | |
d8009882 | 1676 | read_lock(&card->ctl_files_rwlock); |
9244b2c3 | 1677 | list_for_each_entry(ctl, &card->ctl_files, list) { |
1da177e4 LT |
1678 | wake_up(&ctl->change_sleep); |
1679 | kill_fasync(&ctl->fasync, SIGIO, POLL_ERR); | |
1680 | } | |
d8009882 | 1681 | read_unlock(&card->ctl_files_rwlock); |
c461482c | 1682 | |
40a4b263 | 1683 | return snd_unregister_device(&card->ctl_dev); |
1da177e4 LT |
1684 | } |
1685 | ||
1686 | /* | |
1687 | * free all controls | |
1688 | */ | |
82e9bae6 | 1689 | static int snd_ctl_dev_free(struct snd_device *device) |
1da177e4 | 1690 | { |
82e9bae6 TI |
1691 | struct snd_card *card = device->device_data; |
1692 | struct snd_kcontrol *control; | |
1da177e4 LT |
1693 | |
1694 | down_write(&card->controls_rwsem); | |
1695 | while (!list_empty(&card->controls)) { | |
1696 | control = snd_kcontrol(card->controls.next); | |
1697 | snd_ctl_remove(card, control); | |
1698 | } | |
1699 | up_write(&card->controls_rwsem); | |
0fcd9f4b | 1700 | put_device(&card->ctl_dev); |
1da177e4 LT |
1701 | return 0; |
1702 | } | |
1703 | ||
1da177e4 LT |
1704 | /* |
1705 | * create control core: | |
1706 | * called from init.c | |
1707 | */ | |
82e9bae6 | 1708 | int snd_ctl_create(struct snd_card *card) |
1da177e4 | 1709 | { |
82e9bae6 | 1710 | static struct snd_device_ops ops = { |
1da177e4 LT |
1711 | .dev_free = snd_ctl_dev_free, |
1712 | .dev_register = snd_ctl_dev_register, | |
1713 | .dev_disconnect = snd_ctl_dev_disconnect, | |
1da177e4 | 1714 | }; |
0fcd9f4b | 1715 | int err; |
1da177e4 | 1716 | |
7eaa943c TI |
1717 | if (snd_BUG_ON(!card)) |
1718 | return -ENXIO; | |
0fcd9f4b TI |
1719 | if (snd_BUG_ON(card->number < 0 || card->number >= SNDRV_CARDS)) |
1720 | return -ENXIO; | |
1721 | ||
1722 | snd_device_initialize(&card->ctl_dev, card); | |
1723 | dev_set_name(&card->ctl_dev, "controlC%d", card->number); | |
1724 | ||
1725 | err = snd_device_new(card, SNDRV_DEV_CONTROL, card, &ops); | |
1726 | if (err < 0) | |
1727 | put_device(&card->ctl_dev); | |
1728 | return err; | |
1da177e4 | 1729 | } |
b9ed4f2b TI |
1730 | |
1731 | /* | |
9600732b | 1732 | * Frequently used control callbacks/helpers |
b9ed4f2b | 1733 | */ |
12cddbd8 TI |
1734 | |
1735 | /** | |
1736 | * snd_ctl_boolean_mono_info - Helper function for a standard boolean info | |
1737 | * callback with a mono channel | |
1738 | * @kcontrol: the kcontrol instance | |
1739 | * @uinfo: info to store | |
1740 | * | |
1741 | * This is a function that can be used as info callback for a standard | |
1742 | * boolean control with a single mono channel. | |
1743 | */ | |
b9ed4f2b TI |
1744 | int snd_ctl_boolean_mono_info(struct snd_kcontrol *kcontrol, |
1745 | struct snd_ctl_elem_info *uinfo) | |
1746 | { | |
1747 | uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; | |
1748 | uinfo->count = 1; | |
1749 | uinfo->value.integer.min = 0; | |
1750 | uinfo->value.integer.max = 1; | |
1751 | return 0; | |
1752 | } | |
b9ed4f2b TI |
1753 | EXPORT_SYMBOL(snd_ctl_boolean_mono_info); |
1754 | ||
12cddbd8 TI |
1755 | /** |
1756 | * snd_ctl_boolean_stereo_info - Helper function for a standard boolean info | |
1757 | * callback with stereo two channels | |
1758 | * @kcontrol: the kcontrol instance | |
1759 | * @uinfo: info to store | |
1760 | * | |
1761 | * This is a function that can be used as info callback for a standard | |
1762 | * boolean control with stereo two channels. | |
1763 | */ | |
b9ed4f2b TI |
1764 | int snd_ctl_boolean_stereo_info(struct snd_kcontrol *kcontrol, |
1765 | struct snd_ctl_elem_info *uinfo) | |
1766 | { | |
1767 | uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; | |
1768 | uinfo->count = 2; | |
1769 | uinfo->value.integer.min = 0; | |
1770 | uinfo->value.integer.max = 1; | |
1771 | return 0; | |
1772 | } | |
b9ed4f2b | 1773 | EXPORT_SYMBOL(snd_ctl_boolean_stereo_info); |
9600732b CL |
1774 | |
1775 | /** | |
1776 | * snd_ctl_enum_info - fills the info structure for an enumerated control | |
1777 | * @info: the structure to be filled | |
1778 | * @channels: the number of the control's channels; often one | |
1779 | * @items: the number of control values; also the size of @names | |
1780 | * @names: an array containing the names of all control values | |
1781 | * | |
1782 | * Sets all required fields in @info to their appropriate values. | |
1783 | * If the control's accessibility is not the default (readable and writable), | |
1784 | * the caller has to fill @info->access. | |
eb7c06e8 YB |
1785 | * |
1786 | * Return: Zero. | |
9600732b CL |
1787 | */ |
1788 | int snd_ctl_enum_info(struct snd_ctl_elem_info *info, unsigned int channels, | |
1789 | unsigned int items, const char *const names[]) | |
1790 | { | |
1791 | info->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED; | |
1792 | info->count = channels; | |
1793 | info->value.enumerated.items = items; | |
a7e6fb99 TI |
1794 | if (!items) |
1795 | return 0; | |
9600732b CL |
1796 | if (info->value.enumerated.item >= items) |
1797 | info->value.enumerated.item = items - 1; | |
df803e13 TI |
1798 | WARN(strlen(names[info->value.enumerated.item]) >= sizeof(info->value.enumerated.name), |
1799 | "ALSA: too long item name '%s'\n", | |
1800 | names[info->value.enumerated.item]); | |
9600732b CL |
1801 | strlcpy(info->value.enumerated.name, |
1802 | names[info->value.enumerated.item], | |
1803 | sizeof(info->value.enumerated.name)); | |
1804 | return 0; | |
1805 | } | |
1806 | EXPORT_SYMBOL(snd_ctl_enum_info); |