2 * compat ioctls for control API
4 * Copyright (c) by Takashi Iwai <tiwai@suse.de>
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.
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.
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
21 /* this file included from control.c */
23 #include <linux/compat.h>
24 #include <linux/slab.h>
26 struct snd_ctl_elem_list32 {
32 unsigned char reserved[50];
33 } /* don't set packed attribute here */;
35 static int snd_ctl_elem_list_compat(struct snd_card *card,
36 struct snd_ctl_elem_list32 __user *data32)
38 struct snd_ctl_elem_list __user *data;
42 data = compat_alloc_user_space(sizeof(*data));
44 /* offset, space, used, count */
45 if (copy_in_user(data, data32, 4 * sizeof(u32)))
48 if (get_user(ptr, &data32->pids) ||
49 put_user(compat_ptr(ptr), &data->pids))
51 err = snd_ctl_elem_list(card, data);
55 if (copy_in_user(data32, data, 4 * sizeof(u32)))
61 * control element info
62 * it uses union, so the things are not easy..
65 struct snd_ctl_elem_info32 {
66 struct snd_ctl_elem_id id; // the size of struct is same
89 unsigned char reserved[128];
91 unsigned char reserved[64];
92 } __attribute__((packed));
94 static int snd_ctl_elem_info_compat(struct snd_ctl_file *ctl,
95 struct snd_ctl_elem_info32 __user *data32)
97 struct snd_ctl_elem_info *data;
100 data = kzalloc(sizeof(*data), GFP_KERNEL);
106 if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
108 /* we need to copy the item index.
109 * hope this doesn't break anything..
111 if (get_user(data->value.enumerated.item, &data32->value.enumerated.item))
114 snd_power_lock(ctl->card);
115 err = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0);
117 err = snd_ctl_elem_info(ctl, data);
118 snd_power_unlock(ctl->card);
122 /* restore info to 32bit */
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)))
128 if (put_user(data->owner, &data32->owner))
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))
138 case SNDRV_CTL_ELEM_TYPE_INTEGER64:
139 if (copy_to_user(&data32->value.integer64,
140 &data->value.integer64,
141 sizeof(data->value.integer64)))
144 case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
145 if (copy_to_user(&data32->value.enumerated,
146 &data->value.enumerated,
147 sizeof(data->value.enumerated)))
160 struct snd_ctl_elem_value32 {
161 struct snd_ctl_elem_id id;
162 unsigned int indirect; /* bit-field causes misalignment */
165 unsigned char data[512];
166 #ifndef CONFIG_X86_64
170 unsigned char reserved[128];
174 /* get the value type and count of the control */
175 static int get_ctl_type(struct snd_card *card, struct snd_ctl_elem_id *id,
178 struct snd_kcontrol *kctl;
179 struct snd_ctl_elem_info *info;
182 down_read(&card->controls_rwsem);
183 kctl = snd_ctl_find_id(card, id);
185 up_read(&card->controls_rwsem);
188 info = kzalloc(sizeof(*info), GFP_KERNEL);
190 up_read(&card->controls_rwsem);
194 err = kctl->info(kctl, info);
195 up_read(&card->controls_rwsem);
198 *countp = info->count;
204 static int get_elem_size(int type, int count)
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:
213 case SNDRV_CTL_ELEM_TYPE_IEC958:
214 return sizeof(struct snd_aes_iec958);
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,
223 int *typep, int *countp)
226 int uninitialized_var(count);
227 unsigned int indirect;
229 if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
231 if (get_user(indirect, &data32->indirect))
235 type = get_ctl_type(card, &data->id, &count);
239 if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
240 type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
241 for (i = 0; i < count; i++) {
243 if (get_user(val, &data32->value.integer[i]))
245 data->value.integer.value[i] = val;
248 size = get_elem_size(type, count);
250 printk(KERN_ERR "snd_ioctl32_ctl_elem_value: unknown type %d\n", type);
253 if (copy_from_user(data->value.bytes.data,
254 data32->value.data, size))
263 /* restore the value to 32bit */
264 static int copy_ctl_value_to_user(struct snd_ctl_elem_value32 __user *data32,
265 struct snd_ctl_elem_value *data,
270 if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
271 type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
272 for (i = 0; i < count; i++) {
274 val = data->value.integer.value[i];
275 if (put_user(val, &data32->value.integer[i]))
279 size = get_elem_size(type, count);
280 if (copy_to_user(data32->value.data,
281 data->value.bytes.data, size))
287 static int snd_ctl_elem_read_user_compat(struct snd_card *card,
288 struct snd_ctl_elem_value32 __user *data32)
290 struct snd_ctl_elem_value *data;
291 int err, type, count;
293 data = kzalloc(sizeof(*data), GFP_KERNEL);
297 if ((err = copy_ctl_value_from_user(card, data, data32, &type, &count)) < 0)
300 snd_power_lock(card);
301 err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
303 err = snd_ctl_elem_read(card, data);
304 snd_power_unlock(card);
306 err = copy_ctl_value_to_user(data32, data, type, count);
312 static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file,
313 struct snd_ctl_elem_value32 __user *data32)
315 struct snd_ctl_elem_value *data;
316 struct snd_card *card = file->card;
317 int err, type, count;
319 data = kzalloc(sizeof(*data), GFP_KERNEL);
323 if ((err = copy_ctl_value_from_user(card, data, data32, &type, &count)) < 0)
326 snd_power_lock(card);
327 err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
329 err = snd_ctl_elem_write(card, file, data);
330 snd_power_unlock(card);
332 err = copy_ctl_value_to_user(data32, data, type, count);
338 /* add or replace a user control */
339 static int snd_ctl_elem_add_compat(struct snd_ctl_file *file,
340 struct snd_ctl_elem_info32 __user *data32,
343 struct snd_ctl_elem_info *data;
346 data = kzalloc(sizeof(*data), GFP_KERNEL);
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)))
355 if (get_user(data->owner, &data32->owner) ||
356 get_user(data->type, &data32->type))
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))
366 case SNDRV_CTL_ELEM_TYPE_INTEGER64:
367 if (copy_from_user(&data->value.integer64,
368 &data32->value.integer64,
369 sizeof(data->value.integer64)))
372 case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
373 if (copy_from_user(&data->value.enumerated,
374 &data32->value.enumerated,
375 sizeof(data->value.enumerated)))
377 data->value.enumerated.names_ptr =
378 (uintptr_t)compat_ptr(data->value.enumerated.names_ptr);
383 err = snd_ctl_elem_add(file, data, replace);
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),
398 static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
400 struct snd_ctl_file *ctl;
401 struct snd_kctl_ioctl *p;
402 void __user *argp = compat_ptr(arg);
405 ctl = file->private_data;
406 if (snd_BUG_ON(!ctl || !ctl->card))
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:
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:
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);
436 down_read(&snd_ioctl_rwsem);
437 list_for_each_entry(p, &snd_control_compat_ioctls, list) {
439 err = p->fioctl(ctl->card, ctl, cmd, arg);
440 if (err != -ENOIOCTLCMD) {
441 up_read(&snd_ioctl_rwsem);
446 up_read(&snd_ioctl_rwsem);