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>
25 struct snd_ctl_elem_list32 {
31 unsigned char reserved[50];
32 } /* don't set packed attribute here */;
34 static int snd_ctl_elem_list_compat(struct snd_card *card,
35 struct snd_ctl_elem_list32 __user *data32)
37 struct snd_ctl_elem_list __user *data;
41 data = compat_alloc_user_space(sizeof(*data));
43 /* offset, space, used, count */
44 if (copy_in_user(data, data32, 4 * sizeof(u32)))
47 if (get_user(ptr, &data32->pids) ||
48 put_user(compat_ptr(ptr), &data->pids))
50 err = snd_ctl_elem_list(card, data);
54 if (copy_in_user(data32, data, 4 * sizeof(u32)))
60 * control element info
61 * it uses union, so the things are not easy..
64 struct snd_ctl_elem_info32 {
65 struct snd_ctl_elem_id id; // the size of struct is same
86 unsigned char reserved[128];
88 unsigned char reserved[64];
89 } __attribute__((packed));
91 static int snd_ctl_elem_info_compat(struct snd_ctl_file *ctl,
92 struct snd_ctl_elem_info32 __user *data32)
94 struct snd_ctl_elem_info *data;
97 data = kzalloc(sizeof(*data), GFP_KERNEL);
103 if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
105 /* we need to copy the item index.
106 * hope this doesn't break anything..
108 if (get_user(data->value.enumerated.item, &data32->value.enumerated.item))
111 snd_power_lock(ctl->card);
112 err = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0);
114 err = snd_ctl_elem_info(ctl, data);
115 snd_power_unlock(ctl->card);
119 /* restore info to 32bit */
121 /* id, type, access, count */
122 if (copy_to_user(&data32->id, &data->id, sizeof(data->id)) ||
123 copy_to_user(&data32->type, &data->type, 3 * sizeof(u32)))
125 if (put_user(data->owner, &data32->owner))
127 switch (data->type) {
128 case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
129 case SNDRV_CTL_ELEM_TYPE_INTEGER:
130 if (put_user(data->value.integer.min, &data32->value.integer.min) ||
131 put_user(data->value.integer.max, &data32->value.integer.max) ||
132 put_user(data->value.integer.step, &data32->value.integer.step))
135 case SNDRV_CTL_ELEM_TYPE_INTEGER64:
136 if (copy_to_user(&data32->value.integer64,
137 &data->value.integer64,
138 sizeof(data->value.integer64)))
141 case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
142 if (copy_to_user(&data32->value.enumerated,
143 &data->value.enumerated,
144 sizeof(data->value.enumerated)))
157 struct snd_ctl_elem_value32 {
158 struct snd_ctl_elem_id id;
159 unsigned int indirect; /* bit-field causes misalignment */
162 unsigned char data[512];
163 #ifndef CONFIG_X86_64
167 unsigned char reserved[128];
171 /* get the value type and count of the control */
172 static int get_ctl_type(struct snd_card *card, struct snd_ctl_elem_id *id,
175 struct snd_kcontrol *kctl;
176 struct snd_ctl_elem_info *info;
179 down_read(&card->controls_rwsem);
180 kctl = snd_ctl_find_id(card, id);
182 up_read(&card->controls_rwsem);
185 info = kzalloc(sizeof(*info), GFP_KERNEL);
187 up_read(&card->controls_rwsem);
191 err = kctl->info(kctl, info);
192 up_read(&card->controls_rwsem);
195 *countp = info->count;
201 static int get_elem_size(int type, int count)
204 case SNDRV_CTL_ELEM_TYPE_INTEGER64:
205 return sizeof(s64) * count;
206 case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
207 return sizeof(int) * count;
208 case SNDRV_CTL_ELEM_TYPE_BYTES:
210 case SNDRV_CTL_ELEM_TYPE_IEC958:
211 return sizeof(struct snd_aes_iec958);
217 static int copy_ctl_value_from_user(struct snd_card *card,
218 struct snd_ctl_elem_value *data,
219 struct snd_ctl_elem_value32 __user *data32,
220 int *typep, int *countp)
223 int uninitialized_var(count);
224 unsigned int indirect;
226 if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
228 if (get_user(indirect, &data32->indirect))
232 type = get_ctl_type(card, &data->id, &count);
236 if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
237 type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
238 for (i = 0; i < count; i++) {
240 if (get_user(val, &data32->value.integer[i]))
242 data->value.integer.value[i] = val;
245 size = get_elem_size(type, count);
247 printk(KERN_ERR "snd_ioctl32_ctl_elem_value: unknown type %d\n", type);
250 if (copy_from_user(data->value.bytes.data,
251 data32->value.data, size))
260 /* restore the value to 32bit */
261 static int copy_ctl_value_to_user(struct snd_ctl_elem_value32 __user *data32,
262 struct snd_ctl_elem_value *data,
267 if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
268 type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
269 for (i = 0; i < count; i++) {
271 val = data->value.integer.value[i];
272 if (put_user(val, &data32->value.integer[i]))
276 size = get_elem_size(type, count);
277 if (copy_to_user(data32->value.data,
278 data->value.bytes.data, size))
284 static int snd_ctl_elem_read_user_compat(struct snd_card *card,
285 struct snd_ctl_elem_value32 __user *data32)
287 struct snd_ctl_elem_value *data;
288 int err, type, count;
290 data = kzalloc(sizeof(*data), GFP_KERNEL);
294 if ((err = copy_ctl_value_from_user(card, data, data32, &type, &count)) < 0)
297 snd_power_lock(card);
298 err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
300 err = snd_ctl_elem_read(card, data);
301 snd_power_unlock(card);
303 err = copy_ctl_value_to_user(data32, data, type, count);
309 static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file,
310 struct snd_ctl_elem_value32 __user *data32)
312 struct snd_ctl_elem_value *data;
313 struct snd_card *card = file->card;
314 int err, type, count;
316 data = kzalloc(sizeof(*data), GFP_KERNEL);
320 if ((err = copy_ctl_value_from_user(card, data, data32, &type, &count)) < 0)
323 snd_power_lock(card);
324 err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
326 err = snd_ctl_elem_write(card, file, data);
327 snd_power_unlock(card);
329 err = copy_ctl_value_to_user(data32, data, type, count);
335 /* add or replace a user control */
336 static int snd_ctl_elem_add_compat(struct snd_ctl_file *file,
337 struct snd_ctl_elem_info32 __user *data32,
340 struct snd_ctl_elem_info *data;
343 data = kzalloc(sizeof(*data), GFP_KERNEL);
348 /* id, type, access, count */ \
349 if (copy_from_user(&data->id, &data32->id, sizeof(data->id)) ||
350 copy_from_user(&data->type, &data32->type, 3 * sizeof(u32)))
352 if (get_user(data->owner, &data32->owner) ||
353 get_user(data->type, &data32->type))
355 switch (data->type) {
356 case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
357 case SNDRV_CTL_ELEM_TYPE_INTEGER:
358 if (get_user(data->value.integer.min, &data32->value.integer.min) ||
359 get_user(data->value.integer.max, &data32->value.integer.max) ||
360 get_user(data->value.integer.step, &data32->value.integer.step))
363 case SNDRV_CTL_ELEM_TYPE_INTEGER64:
364 if (copy_from_user(&data->value.integer64,
365 &data32->value.integer64,
366 sizeof(data->value.integer64)))
369 case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
370 if (copy_from_user(&data->value.enumerated,
371 &data32->value.enumerated,
372 sizeof(data->value.enumerated)))
378 err = snd_ctl_elem_add(file, data, replace);
385 SNDRV_CTL_IOCTL_ELEM_LIST32 = _IOWR('U', 0x10, struct snd_ctl_elem_list32),
386 SNDRV_CTL_IOCTL_ELEM_INFO32 = _IOWR('U', 0x11, struct snd_ctl_elem_info32),
387 SNDRV_CTL_IOCTL_ELEM_READ32 = _IOWR('U', 0x12, struct snd_ctl_elem_value32),
388 SNDRV_CTL_IOCTL_ELEM_WRITE32 = _IOWR('U', 0x13, struct snd_ctl_elem_value32),
389 SNDRV_CTL_IOCTL_ELEM_ADD32 = _IOWR('U', 0x17, struct snd_ctl_elem_info32),
390 SNDRV_CTL_IOCTL_ELEM_REPLACE32 = _IOWR('U', 0x18, struct snd_ctl_elem_info32),
393 static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
395 struct snd_ctl_file *ctl;
396 struct snd_kctl_ioctl *p;
397 void __user *argp = compat_ptr(arg);
400 ctl = file->private_data;
401 snd_assert(ctl && ctl->card, return -ENXIO);
404 case SNDRV_CTL_IOCTL_PVERSION:
405 case SNDRV_CTL_IOCTL_CARD_INFO:
406 case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
407 case SNDRV_CTL_IOCTL_POWER:
408 case SNDRV_CTL_IOCTL_POWER_STATE:
409 case SNDRV_CTL_IOCTL_ELEM_LOCK:
410 case SNDRV_CTL_IOCTL_ELEM_UNLOCK:
411 case SNDRV_CTL_IOCTL_ELEM_REMOVE:
412 case SNDRV_CTL_IOCTL_TLV_READ:
413 case SNDRV_CTL_IOCTL_TLV_WRITE:
414 case SNDRV_CTL_IOCTL_TLV_COMMAND:
415 return snd_ctl_ioctl(file, cmd, (unsigned long)argp);
416 case SNDRV_CTL_IOCTL_ELEM_LIST32:
417 return snd_ctl_elem_list_compat(ctl->card, argp);
418 case SNDRV_CTL_IOCTL_ELEM_INFO32:
419 return snd_ctl_elem_info_compat(ctl, argp);
420 case SNDRV_CTL_IOCTL_ELEM_READ32:
421 return snd_ctl_elem_read_user_compat(ctl->card, argp);
422 case SNDRV_CTL_IOCTL_ELEM_WRITE32:
423 return snd_ctl_elem_write_user_compat(ctl, argp);
424 case SNDRV_CTL_IOCTL_ELEM_ADD32:
425 return snd_ctl_elem_add_compat(ctl, argp, 0);
426 case SNDRV_CTL_IOCTL_ELEM_REPLACE32:
427 return snd_ctl_elem_add_compat(ctl, argp, 1);
430 down_read(&snd_ioctl_rwsem);
431 list_for_each_entry(p, &snd_control_compat_ioctls, list) {
433 err = p->fioctl(ctl->card, ctl, cmd, arg);
434 if (err != -ENOIOCTLCMD) {
435 up_read(&snd_ioctl_rwsem);
440 up_read(&snd_ioctl_rwsem);