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 | 113 | |
cbac4b0c | 114 | err = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0); |
7d8e8292 TI |
115 | if (err < 0) |
116 | goto error; | |
117 | err = snd_ctl_elem_info(ctl, data); | |
1da177e4 LT |
118 | if (err < 0) |
119 | goto error; | |
120 | /* restore info to 32bit */ | |
121 | err = -EFAULT; | |
122 | /* id, type, access, count */ | |
123 | if (copy_to_user(&data32->id, &data->id, sizeof(data->id)) || | |
124 | copy_to_user(&data32->type, &data->type, 3 * sizeof(u32))) | |
125 | goto error; | |
126 | if (put_user(data->owner, &data32->owner)) | |
127 | goto error; | |
128 | switch (data->type) { | |
129 | case SNDRV_CTL_ELEM_TYPE_BOOLEAN: | |
130 | case SNDRV_CTL_ELEM_TYPE_INTEGER: | |
131 | if (put_user(data->value.integer.min, &data32->value.integer.min) || | |
132 | put_user(data->value.integer.max, &data32->value.integer.max) || | |
133 | put_user(data->value.integer.step, &data32->value.integer.step)) | |
134 | goto error; | |
135 | break; | |
136 | case SNDRV_CTL_ELEM_TYPE_INTEGER64: | |
137 | if (copy_to_user(&data32->value.integer64, | |
138 | &data->value.integer64, | |
139 | sizeof(data->value.integer64))) | |
140 | goto error; | |
141 | break; | |
142 | case SNDRV_CTL_ELEM_TYPE_ENUMERATED: | |
143 | if (copy_to_user(&data32->value.enumerated, | |
144 | &data->value.enumerated, | |
145 | sizeof(data->value.enumerated))) | |
146 | goto error; | |
147 | break; | |
148 | default: | |
149 | break; | |
150 | } | |
151 | err = 0; | |
152 | error: | |
153 | kfree(data); | |
154 | return err; | |
155 | } | |
156 | ||
157 | /* read / write */ | |
82e9bae6 TI |
158 | struct snd_ctl_elem_value32 { |
159 | struct snd_ctl_elem_id id; | |
1da177e4 LT |
160 | unsigned int indirect; /* bit-field causes misalignment */ |
161 | union { | |
162 | s32 integer[128]; | |
163 | unsigned char data[512]; | |
164 | #ifndef CONFIG_X86_64 | |
165 | s64 integer64[64]; | |
166 | #endif | |
167 | } value; | |
168 | unsigned char reserved[128]; | |
169 | }; | |
170 | ||
6236d8bb TI |
171 | #ifdef CONFIG_X86_X32 |
172 | /* x32 has a different alignment for 64bit values from ia32 */ | |
173 | struct snd_ctl_elem_value_x32 { | |
174 | struct snd_ctl_elem_id id; | |
175 | unsigned int indirect; /* bit-field causes misalignment */ | |
176 | union { | |
177 | s32 integer[128]; | |
178 | unsigned char data[512]; | |
179 | s64 integer64[64]; | |
180 | } value; | |
181 | unsigned char reserved[128]; | |
182 | }; | |
183 | #endif /* CONFIG_X86_X32 */ | |
1da177e4 LT |
184 | |
185 | /* get the value type and count of the control */ | |
82e9bae6 TI |
186 | static int get_ctl_type(struct snd_card *card, struct snd_ctl_elem_id *id, |
187 | int *countp) | |
1da177e4 | 188 | { |
82e9bae6 | 189 | struct snd_kcontrol *kctl; |
aa657ca9 | 190 | struct snd_ctl_elem_info *info; |
1da177e4 LT |
191 | int err; |
192 | ||
193 | down_read(&card->controls_rwsem); | |
194 | kctl = snd_ctl_find_id(card, id); | |
195 | if (! kctl) { | |
196 | up_read(&card->controls_rwsem); | |
6f021744 | 197 | return -ENOENT; |
1da177e4 | 198 | } |
aa657ca9 JK |
199 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
200 | if (info == NULL) { | |
201 | up_read(&card->controls_rwsem); | |
202 | return -ENOMEM; | |
203 | } | |
204 | info->id = *id; | |
205 | err = kctl->info(kctl, info); | |
1da177e4 LT |
206 | up_read(&card->controls_rwsem); |
207 | if (err >= 0) { | |
aa657ca9 JK |
208 | err = info->type; |
209 | *countp = info->count; | |
1da177e4 | 210 | } |
aa657ca9 | 211 | kfree(info); |
1da177e4 LT |
212 | return err; |
213 | } | |
214 | ||
215 | static int get_elem_size(int type, int count) | |
216 | { | |
217 | switch (type) { | |
218 | case SNDRV_CTL_ELEM_TYPE_INTEGER64: | |
219 | return sizeof(s64) * count; | |
220 | case SNDRV_CTL_ELEM_TYPE_ENUMERATED: | |
221 | return sizeof(int) * count; | |
222 | case SNDRV_CTL_ELEM_TYPE_BYTES: | |
223 | return 512; | |
224 | case SNDRV_CTL_ELEM_TYPE_IEC958: | |
82e9bae6 | 225 | return sizeof(struct snd_aes_iec958); |
1da177e4 LT |
226 | default: |
227 | return -1; | |
228 | } | |
229 | } | |
230 | ||
82e9bae6 TI |
231 | static int copy_ctl_value_from_user(struct snd_card *card, |
232 | struct snd_ctl_elem_value *data, | |
6236d8bb TI |
233 | void __user *userdata, |
234 | void __user *valuep, | |
1da177e4 LT |
235 | int *typep, int *countp) |
236 | { | |
6236d8bb | 237 | struct snd_ctl_elem_value32 __user *data32 = userdata; |
5050b092 AM |
238 | int i, type, size; |
239 | int uninitialized_var(count); | |
1da177e4 LT |
240 | unsigned int indirect; |
241 | ||
242 | if (copy_from_user(&data->id, &data32->id, sizeof(data->id))) | |
243 | return -EFAULT; | |
244 | if (get_user(indirect, &data32->indirect)) | |
245 | return -EFAULT; | |
246 | if (indirect) | |
247 | return -EINVAL; | |
248 | type = get_ctl_type(card, &data->id, &count); | |
249 | if (type < 0) | |
250 | return type; | |
251 | ||
252 | if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN || | |
253 | type == SNDRV_CTL_ELEM_TYPE_INTEGER) { | |
254 | for (i = 0; i < count; i++) { | |
6236d8bb | 255 | s32 __user *intp = valuep; |
1da177e4 | 256 | int val; |
6236d8bb | 257 | if (get_user(val, &intp[i])) |
1da177e4 LT |
258 | return -EFAULT; |
259 | data->value.integer.value[i] = val; | |
260 | } | |
261 | } else { | |
262 | size = get_elem_size(type, count); | |
263 | if (size < 0) { | |
bb009457 | 264 | dev_err(card->dev, "snd_ioctl32_ctl_elem_value: unknown type %d\n", type); |
1da177e4 LT |
265 | return -EINVAL; |
266 | } | |
6236d8bb | 267 | if (copy_from_user(data->value.bytes.data, valuep, size)) |
1da177e4 LT |
268 | return -EFAULT; |
269 | } | |
270 | ||
271 | *typep = type; | |
272 | *countp = count; | |
273 | return 0; | |
274 | } | |
275 | ||
276 | /* restore the value to 32bit */ | |
6236d8bb TI |
277 | static int copy_ctl_value_to_user(void __user *userdata, |
278 | void __user *valuep, | |
82e9bae6 | 279 | struct snd_ctl_elem_value *data, |
1da177e4 LT |
280 | int type, int count) |
281 | { | |
282 | int i, size; | |
283 | ||
284 | if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN || | |
285 | type == SNDRV_CTL_ELEM_TYPE_INTEGER) { | |
286 | for (i = 0; i < count; i++) { | |
6236d8bb | 287 | s32 __user *intp = valuep; |
1da177e4 LT |
288 | int val; |
289 | val = data->value.integer.value[i]; | |
6236d8bb | 290 | if (put_user(val, &intp[i])) |
1da177e4 LT |
291 | return -EFAULT; |
292 | } | |
293 | } else { | |
294 | size = get_elem_size(type, count); | |
6236d8bb | 295 | if (copy_to_user(valuep, data->value.bytes.data, size)) |
1da177e4 LT |
296 | return -EFAULT; |
297 | } | |
298 | return 0; | |
299 | } | |
300 | ||
6236d8bb TI |
301 | static int ctl_elem_read_user(struct snd_card *card, |
302 | void __user *userdata, void __user *valuep) | |
1da177e4 | 303 | { |
82e9bae6 | 304 | struct snd_ctl_elem_value *data; |
1da177e4 LT |
305 | int err, type, count; |
306 | ||
ca2c0966 | 307 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
1da177e4 LT |
308 | if (data == NULL) |
309 | return -ENOMEM; | |
310 | ||
6236d8bb TI |
311 | err = copy_ctl_value_from_user(card, data, userdata, valuep, |
312 | &type, &count); | |
313 | if (err < 0) | |
1da177e4 | 314 | goto error; |
64649400 | 315 | |
cbac4b0c | 316 | err = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
7d8e8292 TI |
317 | if (err < 0) |
318 | goto error; | |
319 | err = snd_ctl_elem_read(card, data); | |
320 | if (err < 0) | |
321 | goto error; | |
322 | err = copy_ctl_value_to_user(userdata, valuep, data, type, count); | |
1da177e4 LT |
323 | error: |
324 | kfree(data); | |
325 | return err; | |
326 | } | |
327 | ||
6236d8bb TI |
328 | static int ctl_elem_write_user(struct snd_ctl_file *file, |
329 | void __user *userdata, void __user *valuep) | |
1da177e4 | 330 | { |
82e9bae6 | 331 | struct snd_ctl_elem_value *data; |
64649400 | 332 | struct snd_card *card = file->card; |
1da177e4 LT |
333 | int err, type, count; |
334 | ||
ca2c0966 | 335 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
1da177e4 LT |
336 | if (data == NULL) |
337 | return -ENOMEM; | |
338 | ||
6236d8bb TI |
339 | err = copy_ctl_value_from_user(card, data, userdata, valuep, |
340 | &type, &count); | |
341 | if (err < 0) | |
1da177e4 | 342 | goto error; |
64649400 | 343 | |
cbac4b0c | 344 | err = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
7d8e8292 TI |
345 | if (err < 0) |
346 | goto error; | |
347 | err = snd_ctl_elem_write(card, file, data); | |
348 | if (err < 0) | |
349 | goto error; | |
350 | err = copy_ctl_value_to_user(userdata, valuep, data, type, count); | |
1da177e4 LT |
351 | error: |
352 | kfree(data); | |
353 | return err; | |
354 | } | |
355 | ||
6236d8bb TI |
356 | static int snd_ctl_elem_read_user_compat(struct snd_card *card, |
357 | struct snd_ctl_elem_value32 __user *data32) | |
358 | { | |
359 | return ctl_elem_read_user(card, data32, &data32->value); | |
360 | } | |
361 | ||
362 | static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file, | |
363 | struct snd_ctl_elem_value32 __user *data32) | |
364 | { | |
365 | return ctl_elem_write_user(file, data32, &data32->value); | |
366 | } | |
367 | ||
368 | #ifdef CONFIG_X86_X32 | |
369 | static int snd_ctl_elem_read_user_x32(struct snd_card *card, | |
370 | struct snd_ctl_elem_value_x32 __user *data32) | |
371 | { | |
372 | return ctl_elem_read_user(card, data32, &data32->value); | |
373 | } | |
374 | ||
375 | static int snd_ctl_elem_write_user_x32(struct snd_ctl_file *file, | |
376 | struct snd_ctl_elem_value_x32 __user *data32) | |
377 | { | |
378 | return ctl_elem_write_user(file, data32, &data32->value); | |
379 | } | |
380 | #endif /* CONFIG_X86_X32 */ | |
381 | ||
1da177e4 | 382 | /* add or replace a user control */ |
82e9bae6 TI |
383 | static int snd_ctl_elem_add_compat(struct snd_ctl_file *file, |
384 | struct snd_ctl_elem_info32 __user *data32, | |
1da177e4 LT |
385 | int replace) |
386 | { | |
82e9bae6 | 387 | struct snd_ctl_elem_info *data; |
1da177e4 LT |
388 | int err; |
389 | ||
ca2c0966 | 390 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
1da177e4 LT |
391 | if (! data) |
392 | return -ENOMEM; | |
393 | ||
394 | err = -EFAULT; | |
395 | /* id, type, access, count */ \ | |
396 | if (copy_from_user(&data->id, &data32->id, sizeof(data->id)) || | |
397 | copy_from_user(&data->type, &data32->type, 3 * sizeof(u32))) | |
398 | goto error; | |
50c0e858 | 399 | if (get_user(data->owner, &data32->owner)) |
1da177e4 LT |
400 | goto error; |
401 | switch (data->type) { | |
402 | case SNDRV_CTL_ELEM_TYPE_BOOLEAN: | |
403 | case SNDRV_CTL_ELEM_TYPE_INTEGER: | |
404 | if (get_user(data->value.integer.min, &data32->value.integer.min) || | |
405 | get_user(data->value.integer.max, &data32->value.integer.max) || | |
406 | get_user(data->value.integer.step, &data32->value.integer.step)) | |
407 | goto error; | |
408 | break; | |
409 | case SNDRV_CTL_ELEM_TYPE_INTEGER64: | |
410 | if (copy_from_user(&data->value.integer64, | |
411 | &data32->value.integer64, | |
412 | sizeof(data->value.integer64))) | |
413 | goto error; | |
414 | break; | |
415 | case SNDRV_CTL_ELEM_TYPE_ENUMERATED: | |
416 | if (copy_from_user(&data->value.enumerated, | |
417 | &data32->value.enumerated, | |
418 | sizeof(data->value.enumerated))) | |
419 | goto error; | |
8d448162 CL |
420 | data->value.enumerated.names_ptr = |
421 | (uintptr_t)compat_ptr(data->value.enumerated.names_ptr); | |
1da177e4 LT |
422 | break; |
423 | default: | |
424 | break; | |
425 | } | |
426 | err = snd_ctl_elem_add(file, data, replace); | |
427 | error: | |
428 | kfree(data); | |
429 | return err; | |
430 | } | |
431 | ||
432 | enum { | |
82e9bae6 TI |
433 | SNDRV_CTL_IOCTL_ELEM_LIST32 = _IOWR('U', 0x10, struct snd_ctl_elem_list32), |
434 | SNDRV_CTL_IOCTL_ELEM_INFO32 = _IOWR('U', 0x11, struct snd_ctl_elem_info32), | |
435 | SNDRV_CTL_IOCTL_ELEM_READ32 = _IOWR('U', 0x12, struct snd_ctl_elem_value32), | |
436 | SNDRV_CTL_IOCTL_ELEM_WRITE32 = _IOWR('U', 0x13, struct snd_ctl_elem_value32), | |
437 | SNDRV_CTL_IOCTL_ELEM_ADD32 = _IOWR('U', 0x17, struct snd_ctl_elem_info32), | |
438 | SNDRV_CTL_IOCTL_ELEM_REPLACE32 = _IOWR('U', 0x18, struct snd_ctl_elem_info32), | |
6236d8bb TI |
439 | #ifdef CONFIG_X86_X32 |
440 | SNDRV_CTL_IOCTL_ELEM_READ_X32 = _IOWR('U', 0x12, struct snd_ctl_elem_value_x32), | |
441 | SNDRV_CTL_IOCTL_ELEM_WRITE_X32 = _IOWR('U', 0x13, struct snd_ctl_elem_value_x32), | |
442 | #endif /* CONFIG_X86_X32 */ | |
1da177e4 LT |
443 | }; |
444 | ||
445 | static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg) | |
446 | { | |
82e9bae6 | 447 | struct snd_ctl_file *ctl; |
9244b2c3 | 448 | struct snd_kctl_ioctl *p; |
1da177e4 LT |
449 | void __user *argp = compat_ptr(arg); |
450 | int err; | |
451 | ||
452 | ctl = file->private_data; | |
7eaa943c TI |
453 | if (snd_BUG_ON(!ctl || !ctl->card)) |
454 | return -ENXIO; | |
1da177e4 LT |
455 | |
456 | switch (cmd) { | |
457 | case SNDRV_CTL_IOCTL_PVERSION: | |
458 | case SNDRV_CTL_IOCTL_CARD_INFO: | |
459 | case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS: | |
460 | case SNDRV_CTL_IOCTL_POWER: | |
461 | case SNDRV_CTL_IOCTL_POWER_STATE: | |
462 | case SNDRV_CTL_IOCTL_ELEM_LOCK: | |
463 | case SNDRV_CTL_IOCTL_ELEM_UNLOCK: | |
2b1181ed TI |
464 | case SNDRV_CTL_IOCTL_ELEM_REMOVE: |
465 | case SNDRV_CTL_IOCTL_TLV_READ: | |
466 | case SNDRV_CTL_IOCTL_TLV_WRITE: | |
467 | case SNDRV_CTL_IOCTL_TLV_COMMAND: | |
1da177e4 LT |
468 | return snd_ctl_ioctl(file, cmd, (unsigned long)argp); |
469 | case SNDRV_CTL_IOCTL_ELEM_LIST32: | |
470 | return snd_ctl_elem_list_compat(ctl->card, argp); | |
471 | case SNDRV_CTL_IOCTL_ELEM_INFO32: | |
472 | return snd_ctl_elem_info_compat(ctl, argp); | |
473 | case SNDRV_CTL_IOCTL_ELEM_READ32: | |
474 | return snd_ctl_elem_read_user_compat(ctl->card, argp); | |
475 | case SNDRV_CTL_IOCTL_ELEM_WRITE32: | |
476 | return snd_ctl_elem_write_user_compat(ctl, argp); | |
477 | case SNDRV_CTL_IOCTL_ELEM_ADD32: | |
478 | return snd_ctl_elem_add_compat(ctl, argp, 0); | |
479 | case SNDRV_CTL_IOCTL_ELEM_REPLACE32: | |
480 | return snd_ctl_elem_add_compat(ctl, argp, 1); | |
6236d8bb TI |
481 | #ifdef CONFIG_X86_X32 |
482 | case SNDRV_CTL_IOCTL_ELEM_READ_X32: | |
483 | return snd_ctl_elem_read_user_x32(ctl->card, argp); | |
484 | case SNDRV_CTL_IOCTL_ELEM_WRITE_X32: | |
485 | return snd_ctl_elem_write_user_x32(ctl, argp); | |
486 | #endif /* CONFIG_X86_X32 */ | |
1da177e4 LT |
487 | } |
488 | ||
489 | down_read(&snd_ioctl_rwsem); | |
9244b2c3 | 490 | list_for_each_entry(p, &snd_control_compat_ioctls, list) { |
1da177e4 LT |
491 | if (p->fioctl) { |
492 | err = p->fioctl(ctl->card, ctl, cmd, arg); | |
493 | if (err != -ENOIOCTLCMD) { | |
494 | up_read(&snd_ioctl_rwsem); | |
495 | return err; | |
496 | } | |
497 | } | |
498 | } | |
499 | up_read(&snd_ioctl_rwsem); | |
500 | return -ENOIOCTLCMD; | |
501 | } |