blob: 2bb95a7a8809fed3a042e8796b5431ce2afbee46 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090024#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
Takashi Iwai82e9bae2005-11-17 13:53:23 +010026struct snd_ctl_elem_list32 {
Linus Torvalds1da177e2005-04-16 15:20:36 -070027 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
Takashi Iwai82e9bae2005-11-17 13:53:23 +010035static int snd_ctl_elem_list_compat(struct snd_card *card,
36 struct snd_ctl_elem_list32 __user *data32)
Linus Torvalds1da177e2005-04-16 15:20:36 -070037{
Takashi Iwai82e9bae2005-11-17 13:53:23 +010038 struct snd_ctl_elem_list __user *data;
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 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
Takashi Iwai82e9bae2005-11-17 13:53:23 +010065struct snd_ctl_elem_info32 {
66 struct snd_ctl_elem_id id; // the size of struct is same
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 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];
Clemens Ladisch8d448162011-10-07 22:38:59 +020086 u64 names_ptr;
87 u32 names_length;
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 } enumerated;
89 unsigned char reserved[128];
90 } value;
91 unsigned char reserved[64];
92} __attribute__((packed));
93
Takashi Iwai82e9bae2005-11-17 13:53:23 +010094static int snd_ctl_elem_info_compat(struct snd_ctl_file *ctl,
95 struct snd_ctl_elem_info32 __user *data32)
Linus Torvalds1da177e2005-04-16 15:20:36 -070096{
Takashi Iwai82e9bae2005-11-17 13:53:23 +010097 struct snd_ctl_elem_info *data;
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 int err;
99
Takashi Iwaica2c0962005-09-09 14:20:23 +0200100 data = kzalloc(sizeof(*data), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 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;
Giuliano Pochini64649402006-03-13 14:11:11 +0100113
114 snd_power_lock(ctl->card);
Takashi Iwaicbac4b02006-03-27 12:38:07 +0200115 err = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0);
Giuliano Pochini64649402006-03-13 14:11:11 +0100116 if (err >= 0)
117 err = snd_ctl_elem_info(ctl, data);
118 snd_power_unlock(ctl->card);
119
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 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 */
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100160struct snd_ctl_elem_value32 {
161 struct snd_ctl_elem_id id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 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 */
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100175static int get_ctl_type(struct snd_card *card, struct snd_ctl_elem_id *id,
176 int *countp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177{
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100178 struct snd_kcontrol *kctl;
Juergen Kreilederaa657ca2006-02-20 18:28:00 -0800179 struct snd_ctl_elem_info *info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 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 }
Juergen Kreilederaa657ca2006-02-20 18:28:00 -0800188 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 up_read(&card->controls_rwsem);
196 if (err >= 0) {
Juergen Kreilederaa657ca2006-02-20 18:28:00 -0800197 err = info->type;
198 *countp = info->count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 }
Juergen Kreilederaa657ca2006-02-20 18:28:00 -0800200 kfree(info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 return err;
202}
203
204static 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:
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100214 return sizeof(struct snd_aes_iec958);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 default:
216 return -1;
217 }
218}
219
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100220static 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,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 int *typep, int *countp)
224{
Andrew Morton5050b092007-12-14 12:13:12 +0100225 int i, type, size;
226 int uninitialized_var(count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 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 */
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100264static int copy_ctl_value_to_user(struct snd_ctl_elem_value32 __user *data32,
265 struct snd_ctl_elem_value *data,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 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
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100287static int snd_ctl_elem_read_user_compat(struct snd_card *card,
288 struct snd_ctl_elem_value32 __user *data32)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289{
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100290 struct snd_ctl_elem_value *data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 int err, type, count;
292
Takashi Iwaica2c0962005-09-09 14:20:23 +0200293 data = kzalloc(sizeof(*data), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 if (data == NULL)
295 return -ENOMEM;
296
297 if ((err = copy_ctl_value_from_user(card, data, data32, &type, &count)) < 0)
298 goto error;
Giuliano Pochini64649402006-03-13 14:11:11 +0100299
300 snd_power_lock(card);
Takashi Iwaicbac4b02006-03-27 12:38:07 +0200301 err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
Giuliano Pochini64649402006-03-13 14:11:11 +0100302 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 error:
308 kfree(data);
309 return err;
310}
311
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100312static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file,
313 struct snd_ctl_elem_value32 __user *data32)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314{
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100315 struct snd_ctl_elem_value *data;
Giuliano Pochini64649402006-03-13 14:11:11 +0100316 struct snd_card *card = file->card;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 int err, type, count;
318
Takashi Iwaica2c0962005-09-09 14:20:23 +0200319 data = kzalloc(sizeof(*data), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 if (data == NULL)
321 return -ENOMEM;
322
Giuliano Pochini64649402006-03-13 14:11:11 +0100323 if ((err = copy_ctl_value_from_user(card, data, data32, &type, &count)) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 goto error;
Giuliano Pochini64649402006-03-13 14:11:11 +0100325
326 snd_power_lock(card);
Takashi Iwaicbac4b02006-03-27 12:38:07 +0200327 err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
Giuliano Pochini64649402006-03-13 14:11:11 +0100328 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 error:
334 kfree(data);
335 return err;
336}
337
338/* add or replace a user control */
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100339static int snd_ctl_elem_add_compat(struct snd_ctl_file *file,
340 struct snd_ctl_elem_info32 __user *data32,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 int replace)
342{
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100343 struct snd_ctl_elem_info *data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 int err;
345
Takashi Iwaica2c0962005-09-09 14:20:23 +0200346 data = kzalloc(sizeof(*data), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 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;
Clemens Ladisch8d448162011-10-07 22:38:59 +0200377 data->value.enumerated.names_ptr =
378 (uintptr_t)compat_ptr(data->value.enumerated.names_ptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 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
389enum {
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100390 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),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396};
397
398static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
399{
Takashi Iwai82e9bae2005-11-17 13:53:23 +0100400 struct snd_ctl_file *ctl;
Johannes Berg9244b2c2006-10-05 16:02:22 +0200401 struct snd_kctl_ioctl *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 void __user *argp = compat_ptr(arg);
403 int err;
404
405 ctl = file->private_data;
Takashi Iwai7eaa9432008-08-08 17:09:09 +0200406 if (snd_BUG_ON(!ctl || !ctl->card))
407 return -ENXIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408
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:
Takashi Iwai2b1181e2006-09-17 22:02:22 +0200417 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:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 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);
Johannes Berg9244b2c2006-10-05 16:02:22 +0200437 list_for_each_entry(p, &snd_control_compat_ioctls, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 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}