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]; | |
86 | } enumerated; | |
87 | unsigned char reserved[128]; | |
88 | } value; | |
89 | unsigned char reserved[64]; | |
90 | } __attribute__((packed)); | |
91 | ||
82e9bae6 TI |
92 | static int snd_ctl_elem_info_compat(struct snd_ctl_file *ctl, |
93 | struct snd_ctl_elem_info32 __user *data32) | |
1da177e4 | 94 | { |
82e9bae6 | 95 | struct snd_ctl_elem_info *data; |
1da177e4 LT |
96 | int err; |
97 | ||
ca2c0966 | 98 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
1da177e4 LT |
99 | if (! data) |
100 | return -ENOMEM; | |
101 | ||
102 | err = -EFAULT; | |
103 | /* copy id */ | |
104 | if (copy_from_user(&data->id, &data32->id, sizeof(data->id))) | |
105 | goto error; | |
106 | /* we need to copy the item index. | |
107 | * hope this doesn't break anything.. | |
108 | */ | |
109 | if (get_user(data->value.enumerated.item, &data32->value.enumerated.item)) | |
110 | goto error; | |
64649400 GP |
111 | |
112 | snd_power_lock(ctl->card); | |
cbac4b0c | 113 | err = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0); |
64649400 GP |
114 | if (err >= 0) |
115 | err = snd_ctl_elem_info(ctl, data); | |
116 | snd_power_unlock(ctl->card); | |
117 | ||
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 | ||
171 | ||
172 | /* get the value type and count of the control */ | |
82e9bae6 TI |
173 | static int get_ctl_type(struct snd_card *card, struct snd_ctl_elem_id *id, |
174 | int *countp) | |
1da177e4 | 175 | { |
82e9bae6 | 176 | struct snd_kcontrol *kctl; |
aa657ca9 | 177 | struct snd_ctl_elem_info *info; |
1da177e4 LT |
178 | int err; |
179 | ||
180 | down_read(&card->controls_rwsem); | |
181 | kctl = snd_ctl_find_id(card, id); | |
182 | if (! kctl) { | |
183 | up_read(&card->controls_rwsem); | |
184 | return -ENXIO; | |
185 | } | |
aa657ca9 JK |
186 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
187 | if (info == NULL) { | |
188 | up_read(&card->controls_rwsem); | |
189 | return -ENOMEM; | |
190 | } | |
191 | info->id = *id; | |
192 | err = kctl->info(kctl, info); | |
1da177e4 LT |
193 | up_read(&card->controls_rwsem); |
194 | if (err >= 0) { | |
aa657ca9 JK |
195 | err = info->type; |
196 | *countp = info->count; | |
1da177e4 | 197 | } |
aa657ca9 | 198 | kfree(info); |
1da177e4 LT |
199 | return err; |
200 | } | |
201 | ||
202 | static int get_elem_size(int type, int count) | |
203 | { | |
204 | switch (type) { | |
205 | case SNDRV_CTL_ELEM_TYPE_INTEGER64: | |
206 | return sizeof(s64) * count; | |
207 | case SNDRV_CTL_ELEM_TYPE_ENUMERATED: | |
208 | return sizeof(int) * count; | |
209 | case SNDRV_CTL_ELEM_TYPE_BYTES: | |
210 | return 512; | |
211 | case SNDRV_CTL_ELEM_TYPE_IEC958: | |
82e9bae6 | 212 | return sizeof(struct snd_aes_iec958); |
1da177e4 LT |
213 | default: |
214 | return -1; | |
215 | } | |
216 | } | |
217 | ||
82e9bae6 TI |
218 | static int copy_ctl_value_from_user(struct snd_card *card, |
219 | struct snd_ctl_elem_value *data, | |
220 | struct snd_ctl_elem_value32 __user *data32, | |
1da177e4 LT |
221 | int *typep, int *countp) |
222 | { | |
5050b092 AM |
223 | int i, type, size; |
224 | int uninitialized_var(count); | |
1da177e4 LT |
225 | unsigned int indirect; |
226 | ||
227 | if (copy_from_user(&data->id, &data32->id, sizeof(data->id))) | |
228 | return -EFAULT; | |
229 | if (get_user(indirect, &data32->indirect)) | |
230 | return -EFAULT; | |
231 | if (indirect) | |
232 | return -EINVAL; | |
233 | type = get_ctl_type(card, &data->id, &count); | |
234 | if (type < 0) | |
235 | return type; | |
236 | ||
237 | if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN || | |
238 | type == SNDRV_CTL_ELEM_TYPE_INTEGER) { | |
239 | for (i = 0; i < count; i++) { | |
240 | int val; | |
241 | if (get_user(val, &data32->value.integer[i])) | |
242 | return -EFAULT; | |
243 | data->value.integer.value[i] = val; | |
244 | } | |
245 | } else { | |
246 | size = get_elem_size(type, count); | |
247 | if (size < 0) { | |
248 | printk(KERN_ERR "snd_ioctl32_ctl_elem_value: unknown type %d\n", type); | |
249 | return -EINVAL; | |
250 | } | |
251 | if (copy_from_user(data->value.bytes.data, | |
252 | data32->value.data, size)) | |
253 | return -EFAULT; | |
254 | } | |
255 | ||
256 | *typep = type; | |
257 | *countp = count; | |
258 | return 0; | |
259 | } | |
260 | ||
261 | /* restore the value to 32bit */ | |
82e9bae6 TI |
262 | static int copy_ctl_value_to_user(struct snd_ctl_elem_value32 __user *data32, |
263 | struct snd_ctl_elem_value *data, | |
1da177e4 LT |
264 | int type, int count) |
265 | { | |
266 | int i, size; | |
267 | ||
268 | if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN || | |
269 | type == SNDRV_CTL_ELEM_TYPE_INTEGER) { | |
270 | for (i = 0; i < count; i++) { | |
271 | int val; | |
272 | val = data->value.integer.value[i]; | |
273 | if (put_user(val, &data32->value.integer[i])) | |
274 | return -EFAULT; | |
275 | } | |
276 | } else { | |
277 | size = get_elem_size(type, count); | |
278 | if (copy_to_user(data32->value.data, | |
279 | data->value.bytes.data, size)) | |
280 | return -EFAULT; | |
281 | } | |
282 | return 0; | |
283 | } | |
284 | ||
82e9bae6 TI |
285 | static int snd_ctl_elem_read_user_compat(struct snd_card *card, |
286 | struct snd_ctl_elem_value32 __user *data32) | |
1da177e4 | 287 | { |
82e9bae6 | 288 | struct snd_ctl_elem_value *data; |
1da177e4 LT |
289 | int err, type, count; |
290 | ||
ca2c0966 | 291 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
1da177e4 LT |
292 | if (data == NULL) |
293 | return -ENOMEM; | |
294 | ||
295 | if ((err = copy_ctl_value_from_user(card, data, data32, &type, &count)) < 0) | |
296 | goto error; | |
64649400 GP |
297 | |
298 | snd_power_lock(card); | |
cbac4b0c | 299 | err = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
64649400 GP |
300 | if (err >= 0) |
301 | err = snd_ctl_elem_read(card, data); | |
302 | snd_power_unlock(card); | |
303 | if (err >= 0) | |
304 | err = copy_ctl_value_to_user(data32, data, type, count); | |
1da177e4 LT |
305 | error: |
306 | kfree(data); | |
307 | return err; | |
308 | } | |
309 | ||
82e9bae6 TI |
310 | static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file, |
311 | struct snd_ctl_elem_value32 __user *data32) | |
1da177e4 | 312 | { |
82e9bae6 | 313 | struct snd_ctl_elem_value *data; |
64649400 | 314 | struct snd_card *card = file->card; |
1da177e4 LT |
315 | int err, type, count; |
316 | ||
ca2c0966 | 317 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
1da177e4 LT |
318 | if (data == NULL) |
319 | return -ENOMEM; | |
320 | ||
64649400 | 321 | if ((err = copy_ctl_value_from_user(card, data, data32, &type, &count)) < 0) |
1da177e4 | 322 | goto error; |
64649400 GP |
323 | |
324 | snd_power_lock(card); | |
cbac4b0c | 325 | err = snd_power_wait(card, SNDRV_CTL_POWER_D0); |
64649400 GP |
326 | if (err >= 0) |
327 | err = snd_ctl_elem_write(card, file, data); | |
328 | snd_power_unlock(card); | |
329 | if (err >= 0) | |
330 | err = copy_ctl_value_to_user(data32, data, type, count); | |
1da177e4 LT |
331 | error: |
332 | kfree(data); | |
333 | return err; | |
334 | } | |
335 | ||
336 | /* add or replace a user control */ | |
82e9bae6 TI |
337 | static int snd_ctl_elem_add_compat(struct snd_ctl_file *file, |
338 | struct snd_ctl_elem_info32 __user *data32, | |
1da177e4 LT |
339 | int replace) |
340 | { | |
82e9bae6 | 341 | struct snd_ctl_elem_info *data; |
1da177e4 LT |
342 | int err; |
343 | ||
ca2c0966 | 344 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
1da177e4 LT |
345 | if (! data) |
346 | return -ENOMEM; | |
347 | ||
348 | err = -EFAULT; | |
349 | /* id, type, access, count */ \ | |
350 | if (copy_from_user(&data->id, &data32->id, sizeof(data->id)) || | |
351 | copy_from_user(&data->type, &data32->type, 3 * sizeof(u32))) | |
352 | goto error; | |
353 | if (get_user(data->owner, &data32->owner) || | |
354 | get_user(data->type, &data32->type)) | |
355 | goto error; | |
356 | switch (data->type) { | |
357 | case SNDRV_CTL_ELEM_TYPE_BOOLEAN: | |
358 | case SNDRV_CTL_ELEM_TYPE_INTEGER: | |
359 | if (get_user(data->value.integer.min, &data32->value.integer.min) || | |
360 | get_user(data->value.integer.max, &data32->value.integer.max) || | |
361 | get_user(data->value.integer.step, &data32->value.integer.step)) | |
362 | goto error; | |
363 | break; | |
364 | case SNDRV_CTL_ELEM_TYPE_INTEGER64: | |
365 | if (copy_from_user(&data->value.integer64, | |
366 | &data32->value.integer64, | |
367 | sizeof(data->value.integer64))) | |
368 | goto error; | |
369 | break; | |
370 | case SNDRV_CTL_ELEM_TYPE_ENUMERATED: | |
371 | if (copy_from_user(&data->value.enumerated, | |
372 | &data32->value.enumerated, | |
373 | sizeof(data->value.enumerated))) | |
374 | goto error; | |
375 | break; | |
376 | default: | |
377 | break; | |
378 | } | |
379 | err = snd_ctl_elem_add(file, data, replace); | |
380 | error: | |
381 | kfree(data); | |
382 | return err; | |
383 | } | |
384 | ||
385 | enum { | |
82e9bae6 TI |
386 | SNDRV_CTL_IOCTL_ELEM_LIST32 = _IOWR('U', 0x10, struct snd_ctl_elem_list32), |
387 | SNDRV_CTL_IOCTL_ELEM_INFO32 = _IOWR('U', 0x11, struct snd_ctl_elem_info32), | |
388 | SNDRV_CTL_IOCTL_ELEM_READ32 = _IOWR('U', 0x12, struct snd_ctl_elem_value32), | |
389 | SNDRV_CTL_IOCTL_ELEM_WRITE32 = _IOWR('U', 0x13, struct snd_ctl_elem_value32), | |
390 | SNDRV_CTL_IOCTL_ELEM_ADD32 = _IOWR('U', 0x17, struct snd_ctl_elem_info32), | |
391 | SNDRV_CTL_IOCTL_ELEM_REPLACE32 = _IOWR('U', 0x18, struct snd_ctl_elem_info32), | |
1da177e4 LT |
392 | }; |
393 | ||
394 | static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg) | |
395 | { | |
82e9bae6 | 396 | struct snd_ctl_file *ctl; |
9244b2c3 | 397 | struct snd_kctl_ioctl *p; |
1da177e4 LT |
398 | void __user *argp = compat_ptr(arg); |
399 | int err; | |
400 | ||
401 | ctl = file->private_data; | |
7eaa943c TI |
402 | if (snd_BUG_ON(!ctl || !ctl->card)) |
403 | return -ENXIO; | |
1da177e4 LT |
404 | |
405 | switch (cmd) { | |
406 | case SNDRV_CTL_IOCTL_PVERSION: | |
407 | case SNDRV_CTL_IOCTL_CARD_INFO: | |
408 | case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS: | |
409 | case SNDRV_CTL_IOCTL_POWER: | |
410 | case SNDRV_CTL_IOCTL_POWER_STATE: | |
411 | case SNDRV_CTL_IOCTL_ELEM_LOCK: | |
412 | case SNDRV_CTL_IOCTL_ELEM_UNLOCK: | |
2b1181ed TI |
413 | case SNDRV_CTL_IOCTL_ELEM_REMOVE: |
414 | case SNDRV_CTL_IOCTL_TLV_READ: | |
415 | case SNDRV_CTL_IOCTL_TLV_WRITE: | |
416 | case SNDRV_CTL_IOCTL_TLV_COMMAND: | |
1da177e4 LT |
417 | return snd_ctl_ioctl(file, cmd, (unsigned long)argp); |
418 | case SNDRV_CTL_IOCTL_ELEM_LIST32: | |
419 | return snd_ctl_elem_list_compat(ctl->card, argp); | |
420 | case SNDRV_CTL_IOCTL_ELEM_INFO32: | |
421 | return snd_ctl_elem_info_compat(ctl, argp); | |
422 | case SNDRV_CTL_IOCTL_ELEM_READ32: | |
423 | return snd_ctl_elem_read_user_compat(ctl->card, argp); | |
424 | case SNDRV_CTL_IOCTL_ELEM_WRITE32: | |
425 | return snd_ctl_elem_write_user_compat(ctl, argp); | |
426 | case SNDRV_CTL_IOCTL_ELEM_ADD32: | |
427 | return snd_ctl_elem_add_compat(ctl, argp, 0); | |
428 | case SNDRV_CTL_IOCTL_ELEM_REPLACE32: | |
429 | return snd_ctl_elem_add_compat(ctl, argp, 1); | |
430 | } | |
431 | ||
432 | down_read(&snd_ioctl_rwsem); | |
9244b2c3 | 433 | list_for_each_entry(p, &snd_control_compat_ioctls, list) { |
1da177e4 LT |
434 | if (p->fioctl) { |
435 | err = p->fioctl(ctl->card, ctl, cmd, arg); | |
436 | if (err != -ENOIOCTLCMD) { | |
437 | up_read(&snd_ioctl_rwsem); | |
438 | return err; | |
439 | } | |
440 | } | |
441 | } | |
442 | up_read(&snd_ioctl_rwsem); | |
443 | return -ENOIOCTLCMD; | |
444 | } |