Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * compat ioctls for control API | |
3 | * | |
4 | * Copyright (c) by Takashi Iwai <tiwai@suse.de> | |
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 | /* this file included from control.c */ | |
22 | ||
23 | #include <linux/compat.h> | |
5a0e3ad6 | 24 | #include <linux/slab.h> |
1da177e4 | 25 | |
82e9bae6 | 26 | struct snd_ctl_elem_list32 { |
1da177e4 LT |
27 | u32 offset; |
28 | u32 space; | |
29 | u32 used; | |
30 | u32 count; | |
31 | u32 pids; | |
32 | unsigned char reserved[50]; | |
33 | } /* don't set packed attribute here */; | |
34 | ||
82e9bae6 TI |
35 | static int snd_ctl_elem_list_compat(struct snd_card *card, |
36 | struct snd_ctl_elem_list32 __user *data32) | |
1da177e4 | 37 | { |
82e9bae6 | 38 | struct snd_ctl_elem_list __user *data; |
1da177e4 LT |
39 | compat_caddr_t ptr; |
40 | int err; | |
41 | ||
42 | data = compat_alloc_user_space(sizeof(*data)); | |
43 | ||
44 | /* offset, space, used, count */ | |
45 | if (copy_in_user(data, data32, 4 * sizeof(u32))) | |
46 | return -EFAULT; | |
47 | /* pids */ | |
48 | if (get_user(ptr, &data32->pids) || | |
49 | put_user(compat_ptr(ptr), &data->pids)) | |
50 | return -EFAULT; | |
51 | err = snd_ctl_elem_list(card, data); | |
52 | if (err < 0) | |
53 | return err; | |
54 | /* copy the result */ | |
55 | if (copy_in_user(data32, data, 4 * sizeof(u32))) | |
56 | return -EFAULT; | |
57 | return 0; | |
58 | } | |
59 | ||
60 | /* | |
61 | * control element info | |
62 | * it uses union, so the things are not easy.. | |
63 | */ | |
64 | ||
82e9bae6 TI |
65 | struct snd_ctl_elem_info32 { |
66 | struct snd_ctl_elem_id id; // the size of struct is same | |
1da177e4 LT |
67 | s32 type; |
68 | u32 access; | |
69 | u32 count; | |
70 | s32 owner; | |
71 | union { | |
72 | struct { | |
73 | s32 min; | |
74 | s32 max; | |
75 | s32 step; | |
76 | } integer; | |
77 | struct { | |
78 | u64 min; | |
79 | u64 max; | |
80 | u64 step; | |
81 | } integer64; | |
82 | struct { | |
83 | u32 items; | |
84 | u32 item; | |
85 | char name[64]; | |
8d448162 CL |
86 | u64 names_ptr; |
87 | u32 names_length; | |
1da177e4 LT |
88 | } enumerated; |
89 | unsigned char reserved[128]; | |
90 | } value; | |
91 | unsigned char reserved[64]; | |
92 | } __attribute__((packed)); | |
93 | ||
82e9bae6 TI |
94 | static int snd_ctl_elem_info_compat(struct snd_ctl_file *ctl, |
95 | struct snd_ctl_elem_info32 __user *data32) | |
1da177e4 | 96 | { |
82e9bae6 | 97 | struct snd_ctl_elem_info *data; |
1da177e4 LT |
98 | int err; |
99 | ||
ca2c0966 | 100 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
1da177e4 LT |
101 | if (! data) |
102 | return -ENOMEM; | |
103 | ||
104 | err = -EFAULT; | |
105 | /* copy id */ | |
106 | if (copy_from_user(&data->id, &data32->id, sizeof(data->id))) | |
107 | goto error; | |
108 | /* we need to copy the item index. | |
109 | * hope this doesn't break anything.. | |
110 | */ | |
111 | if (get_user(data->value.enumerated.item, &data32->value.enumerated.item)) | |
112 | goto error; | |
64649400 GP |
113 | |
114 | snd_power_lock(ctl->card); | |
cbac4b0c | 115 | err = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0); |
64649400 GP |
116 | if (err >= 0) |
117 | err = snd_ctl_elem_info(ctl, data); | |
118 | snd_power_unlock(ctl->card); | |
119 | ||
1da177e4 LT |
120 | if (err < 0) |
121 | goto error; | |
122 | /* restore info to 32bit */ | |
123 | err = -EFAULT; | |
124 | /* id, type, access, count */ | |
125 | if (copy_to_user(&data32->id, &data->id, sizeof(data->id)) || | |
126 | copy_to_user(&data32->type, &data->type, 3 * sizeof(u32))) | |
127 | goto error; | |
128 | if (put_user(data->owner, &data32->owner)) | |
129 | goto error; | |
130 | switch (data->type) { | |
131 | case SNDRV_CTL_ELEM_TYPE_BOOLEAN: | |
132 | case SNDRV_CTL_ELEM_TYPE_INTEGER: | |
133 | if (put_user(data->value.integer.min, &data32->value.integer.min) || | |
134 | put_user(data->value.integer.max, &data32->value.integer.max) || | |
135 | put_user(data->value.integer.step, &data32->value.integer.step)) | |
136 | goto error; | |
137 | break; | |
138 | case SNDRV_CTL_ELEM_TYPE_INTEGER64: | |
139 | if (copy_to_user(&data32->value.integer64, | |
140 | &data->value.integer64, | |
141 | sizeof(data->value.integer64))) | |
142 | goto error; | |
143 | break; | |
144 | case SNDRV_CTL_ELEM_TYPE_ENUMERATED: | |
145 | if (copy_to_user(&data32->value.enumerated, | |
146 | &data->value.enumerated, | |
147 | sizeof(data->value.enumerated))) | |
148 | goto error; | |
149 | break; | |
150 | default: | |
151 | break; | |
152 | } | |
153 | err = 0; | |
154 | error: | |
155 | kfree(data); | |
156 | return err; | |
157 | } | |
158 | ||
159 | /* read / write */ | |
82e9bae6 TI |
160 | struct snd_ctl_elem_value32 { |
161 | struct snd_ctl_elem_id id; | |
1da177e4 LT |
162 | unsigned int indirect; /* bit-field causes misalignment */ |
163 | union { | |
164 | s32 integer[128]; | |
165 | unsigned char data[512]; | |
166 | #ifndef CONFIG_X86_64 | |
167 | s64 integer64[64]; | |
168 | #endif | |
169 | } value; | |
170 | unsigned char reserved[128]; | |
171 | }; | |
172 | ||
173 | ||
174 | /* get the value type and count of the control */ | |
82e9bae6 TI |
175 | static int get_ctl_type(struct snd_card *card, struct snd_ctl_elem_id *id, |
176 | int *countp) | |
1da177e4 | 177 | { |
82e9bae6 | 178 | struct snd_kcontrol *kctl; |
aa657ca9 | 179 | struct snd_ctl_elem_info *info; |
1da177e4 LT |
180 | int err; |
181 | ||
182 | down_read(&card->controls_rwsem); | |
183 | kctl = snd_ctl_find_id(card, id); | |
184 | if (! kctl) { | |
185 | up_read(&card->controls_rwsem); | |
186 | return -ENXIO; | |
187 | } | |
aa657ca9 JK |
188 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
189 | if (info == NULL) { | |
190 | up_read(&card->controls_rwsem); | |
191 | return -ENOMEM; | |
192 | } | |
193 | info->id = *id; | |
194 | err = kctl->info(kctl, info); | |
1da177e4 LT |
195 | up_read(&card->controls_rwsem); |
196 | if (err >= 0) { | |
aa657ca9 JK |
197 | err = info->type; |
198 | *countp = info->count; | |
1da177e4 | 199 | } |
aa657ca9 | 200 | kfree(info); |
1da177e4 LT |
201 | return err; |
202 | } | |
203 | ||
204 | static int get_elem_size(int type, int count) | |
205 | { | |
206 | switch (type) { | |
207 | case SNDRV_CTL_ELEM_TYPE_INTEGER64: | |
208 | return sizeof(s64) * count; | |
209 | case SNDRV_CTL_ELEM_TYPE_ENUMERATED: | |
210 | return sizeof(int) * count; | |
211 | case SNDRV_CTL_ELEM_TYPE_BYTES: | |
212 | return 512; | |
213 | case SNDRV_CTL_ELEM_TYPE_IEC958: | |
82e9bae6 | 214 | return sizeof(struct snd_aes_iec958); |
1da177e4 LT |
215 | default: |
216 | return -1; | |
217 | } | |
218 | } | |
219 | ||
82e9bae6 TI |
220 | static int copy_ctl_value_from_user(struct snd_card *card, |
221 | struct snd_ctl_elem_value *data, | |
222 | struct snd_ctl_elem_value32 __user *data32, | |
1da177e4 LT |
223 | int *typep, int *countp) |
224 | { | |
5050b092 AM |
225 | int i, type, size; |
226 | int uninitialized_var(count); | |
1da177e4 LT |
227 | unsigned int indirect; |
228 | ||
229 | if (copy_from_user(&data->id, &data32->id, sizeof(data->id))) | |
230 | return -EFAULT; | |
231 | if (get_user(indirect, &data32->indirect)) | |
232 | return -EFAULT; | |
233 | if (indirect) | |
234 | return -EINVAL; | |
235 | type = get_ctl_type(card, &data->id, &count); | |
236 | if (type < 0) | |
237 | return type; | |
238 | ||
239 | if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN || | |
240 | type == SNDRV_CTL_ELEM_TYPE_INTEGER) { | |
241 | for (i = 0; i < count; i++) { | |
242 | int val; | |
243 | if (get_user(val, &data32->value.integer[i])) | |
244 | return -EFAULT; | |
245 | data->value.integer.value[i] = val; | |
246 | } | |
247 | } else { | |
248 | size = get_elem_size(type, count); | |
249 | if (size < 0) { | |
250 | printk(KERN_ERR "snd_ioctl32_ctl_elem_value: unknown type %d\n", type); | |
251 | return -EINVAL; | |
252 | } | |
253 | if (copy_from_user(data->value.bytes.data, | |
254 | data32->value.data, size)) | |
255 | return -EFAULT; | |
256 | } | |
257 | ||
258 | *typep = type; | |
259 | *countp = count; | |
260 | return 0; | |
261 | } | |
262 | ||
263 | /* restore the value to 32bit */ | |
82e9bae6 TI |
264 | static int copy_ctl_value_to_user(struct snd_ctl_elem_value32 __user *data32, |
265 | struct snd_ctl_elem_value *data, | |
1da177e4 LT |
266 | int type, int count) |
267 | { | |
268 | int i, size; | |
269 | ||
270 | if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN || | |
271 | type == SNDRV_CTL_ELEM_TYPE_INTEGER) { | |
272 | for (i = 0; i < count; i++) { | |
273 | int val; | |
274 | val = data->value.integer.value[i]; | |
275 | if (put_user(val, &data32->value.integer[i])) | |
276 | return -EFAULT; | |
277 | } | |
278 | } else { | |
279 | size = get_elem_size(type, count); | |
280 | if (copy_to_user(data32->value.data, | |
281 | data->value.bytes.data, size)) | |
282 | return -EFAULT; | |
283 | } | |
284 | return 0; | |
285 | } | |
286 | ||
82e9bae6 TI |
287 | static int snd_ctl_elem_read_user_compat(struct snd_card *card, |
288 | struct snd_ctl_elem_value32 __user *data32) | |
1da177e4 | 289 | { |
82e9bae6 | 290 | struct snd_ctl_elem_value *data; |
1da177e4 LT |
291 | int err, type, count; |
292 | ||
ca2c0966 | 293 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
1da177e4 LT |
294 | if (data == NULL) |
295 | return -ENOMEM; | |
296 | ||
297 | if ((err = copy_ctl_value_from_user(card, data, data32, &type, &count)) < 0) | |
298 | goto error; | |
64649400 GP |
299 | |
300 | snd_power_lock(card); | |
cbac4b0c | 301 | err = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
64649400 GP |
302 | if (err >= 0) |
303 | err = snd_ctl_elem_read(card, data); | |
304 | snd_power_unlock(card); | |
305 | if (err >= 0) | |
306 | err = copy_ctl_value_to_user(data32, data, type, count); | |
1da177e4 LT |
307 | error: |
308 | kfree(data); | |
309 | return err; | |
310 | } | |
311 | ||
82e9bae6 TI |
312 | static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file, |
313 | struct snd_ctl_elem_value32 __user *data32) | |
1da177e4 | 314 | { |
82e9bae6 | 315 | struct snd_ctl_elem_value *data; |
64649400 | 316 | struct snd_card *card = file->card; |
1da177e4 LT |
317 | int err, type, count; |
318 | ||
ca2c0966 | 319 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
1da177e4 LT |
320 | if (data == NULL) |
321 | return -ENOMEM; | |
322 | ||
64649400 | 323 | if ((err = copy_ctl_value_from_user(card, data, data32, &type, &count)) < 0) |
1da177e4 | 324 | goto error; |
64649400 GP |
325 | |
326 | snd_power_lock(card); | |
cbac4b0c | 327 | err = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
64649400 GP |
328 | if (err >= 0) |
329 | err = snd_ctl_elem_write(card, file, data); | |
330 | snd_power_unlock(card); | |
331 | if (err >= 0) | |
332 | err = copy_ctl_value_to_user(data32, data, type, count); | |
1da177e4 LT |
333 | error: |
334 | kfree(data); | |
335 | return err; | |
336 | } | |
337 | ||
338 | /* add or replace a user control */ | |
82e9bae6 TI |
339 | static int snd_ctl_elem_add_compat(struct snd_ctl_file *file, |
340 | struct snd_ctl_elem_info32 __user *data32, | |
1da177e4 LT |
341 | int replace) |
342 | { | |
82e9bae6 | 343 | struct snd_ctl_elem_info *data; |
1da177e4 LT |
344 | int err; |
345 | ||
ca2c0966 | 346 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
1da177e4 LT |
347 | if (! data) |
348 | return -ENOMEM; | |
349 | ||
350 | err = -EFAULT; | |
351 | /* id, type, access, count */ \ | |
352 | if (copy_from_user(&data->id, &data32->id, sizeof(data->id)) || | |
353 | copy_from_user(&data->type, &data32->type, 3 * sizeof(u32))) | |
354 | goto error; | |
355 | if (get_user(data->owner, &data32->owner) || | |
356 | get_user(data->type, &data32->type)) | |
357 | goto error; | |
358 | switch (data->type) { | |
359 | case SNDRV_CTL_ELEM_TYPE_BOOLEAN: | |
360 | case SNDRV_CTL_ELEM_TYPE_INTEGER: | |
361 | if (get_user(data->value.integer.min, &data32->value.integer.min) || | |
362 | get_user(data->value.integer.max, &data32->value.integer.max) || | |
363 | get_user(data->value.integer.step, &data32->value.integer.step)) | |
364 | goto error; | |
365 | break; | |
366 | case SNDRV_CTL_ELEM_TYPE_INTEGER64: | |
367 | if (copy_from_user(&data->value.integer64, | |
368 | &data32->value.integer64, | |
369 | sizeof(data->value.integer64))) | |
370 | goto error; | |
371 | break; | |
372 | case SNDRV_CTL_ELEM_TYPE_ENUMERATED: | |
373 | if (copy_from_user(&data->value.enumerated, | |
374 | &data32->value.enumerated, | |
375 | sizeof(data->value.enumerated))) | |
376 | goto error; | |
8d448162 CL |
377 | data->value.enumerated.names_ptr = |
378 | (uintptr_t)compat_ptr(data->value.enumerated.names_ptr); | |
1da177e4 LT |
379 | break; |
380 | default: | |
381 | break; | |
382 | } | |
383 | err = snd_ctl_elem_add(file, data, replace); | |
384 | error: | |
385 | kfree(data); | |
386 | return err; | |
387 | } | |
388 | ||
389 | enum { | |
82e9bae6 TI |
390 | SNDRV_CTL_IOCTL_ELEM_LIST32 = _IOWR('U', 0x10, struct snd_ctl_elem_list32), |
391 | SNDRV_CTL_IOCTL_ELEM_INFO32 = _IOWR('U', 0x11, struct snd_ctl_elem_info32), | |
392 | SNDRV_CTL_IOCTL_ELEM_READ32 = _IOWR('U', 0x12, struct snd_ctl_elem_value32), | |
393 | SNDRV_CTL_IOCTL_ELEM_WRITE32 = _IOWR('U', 0x13, struct snd_ctl_elem_value32), | |
394 | SNDRV_CTL_IOCTL_ELEM_ADD32 = _IOWR('U', 0x17, struct snd_ctl_elem_info32), | |
395 | SNDRV_CTL_IOCTL_ELEM_REPLACE32 = _IOWR('U', 0x18, struct snd_ctl_elem_info32), | |
1da177e4 LT |
396 | }; |
397 | ||
398 | static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg) | |
399 | { | |
82e9bae6 | 400 | struct snd_ctl_file *ctl; |
9244b2c3 | 401 | struct snd_kctl_ioctl *p; |
1da177e4 LT |
402 | void __user *argp = compat_ptr(arg); |
403 | int err; | |
404 | ||
405 | ctl = file->private_data; | |
7eaa943c TI |
406 | if (snd_BUG_ON(!ctl || !ctl->card)) |
407 | return -ENXIO; | |
1da177e4 LT |
408 | |
409 | switch (cmd) { | |
410 | case SNDRV_CTL_IOCTL_PVERSION: | |
411 | case SNDRV_CTL_IOCTL_CARD_INFO: | |
412 | case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS: | |
413 | case SNDRV_CTL_IOCTL_POWER: | |
414 | case SNDRV_CTL_IOCTL_POWER_STATE: | |
415 | case SNDRV_CTL_IOCTL_ELEM_LOCK: | |
416 | case SNDRV_CTL_IOCTL_ELEM_UNLOCK: | |
2b1181ed TI |
417 | case SNDRV_CTL_IOCTL_ELEM_REMOVE: |
418 | case SNDRV_CTL_IOCTL_TLV_READ: | |
419 | case SNDRV_CTL_IOCTL_TLV_WRITE: | |
420 | case SNDRV_CTL_IOCTL_TLV_COMMAND: | |
1da177e4 LT |
421 | return snd_ctl_ioctl(file, cmd, (unsigned long)argp); |
422 | case SNDRV_CTL_IOCTL_ELEM_LIST32: | |
423 | return snd_ctl_elem_list_compat(ctl->card, argp); | |
424 | case SNDRV_CTL_IOCTL_ELEM_INFO32: | |
425 | return snd_ctl_elem_info_compat(ctl, argp); | |
426 | case SNDRV_CTL_IOCTL_ELEM_READ32: | |
427 | return snd_ctl_elem_read_user_compat(ctl->card, argp); | |
428 | case SNDRV_CTL_IOCTL_ELEM_WRITE32: | |
429 | return snd_ctl_elem_write_user_compat(ctl, argp); | |
430 | case SNDRV_CTL_IOCTL_ELEM_ADD32: | |
431 | return snd_ctl_elem_add_compat(ctl, argp, 0); | |
432 | case SNDRV_CTL_IOCTL_ELEM_REPLACE32: | |
433 | return snd_ctl_elem_add_compat(ctl, argp, 1); | |
434 | } | |
435 | ||
436 | down_read(&snd_ioctl_rwsem); | |
9244b2c3 | 437 | list_for_each_entry(p, &snd_control_compat_ioctls, list) { |
1da177e4 LT |
438 | if (p->fioctl) { |
439 | err = p->fioctl(ctl->card, ctl, cmd, arg); | |
440 | if (err != -ENOIOCTLCMD) { | |
441 | up_read(&snd_ioctl_rwsem); | |
442 | return err; | |
443 | } | |
444 | } | |
445 | } | |
446 | up_read(&snd_ioctl_rwsem); | |
447 | return -ENOIOCTLCMD; | |
448 | } |