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
87 unsigned char reserved[128];
89 unsigned char reserved[64];
90 } __attribute__((packed));
92 static int snd_ctl_elem_info_compat(struct snd_ctl_file *ctl,
93 struct snd_ctl_elem_info32 __user *data32)
95 struct snd_ctl_elem_info *data;
98 data = kzalloc(sizeof(*data), GFP_KERNEL);
104 if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
106 /* we need to copy the item index.
107 * hope this doesn't break anything..
109 if (get_user(data->value.enumerated.item, &data32->value.enumerated.item))
112 snd_power_lock(ctl->card);
113 err = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0);
115 err = snd_ctl_elem_info(ctl, data);
116 snd_power_unlock(ctl->card);
120 /* restore info to 32bit */
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)))
126 if (put_user(data->owner, &data32->owner))
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))
136 case SNDRV_CTL_ELEM_TYPE_INTEGER64:
137 if (copy_to_user(&data32->value.integer64,
138 &data->value.integer64,
139 sizeof(data->value.integer64)))
142 case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
143 if (copy_to_user(&data32->value.enumerated,
144 &data->value.enumerated,
145 sizeof(data->value.enumerated)))
158 struct snd_ctl_elem_value32 {
159 struct snd_ctl_elem_id id;
160 unsigned int indirect; /* bit-field causes misalignment */
163 unsigned char data[512];
164 #ifndef CONFIG_X86_64
168 unsigned char reserved[128];
172 /* get the value type and count of the control */
173 static int get_ctl_type(struct snd_card *card, struct snd_ctl_elem_id *id,
176 struct snd_kcontrol *kctl;
177 struct snd_ctl_elem_info *info;
180 down_read(&card->controls_rwsem);
181 kctl = snd_ctl_find_id(card, id);
183 up_read(&card->controls_rwsem);
186 info = kzalloc(sizeof(*info), GFP_KERNEL);
188 up_read(&card->controls_rwsem);
192 err = kctl->info(kctl, info);
193 up_read(&card->controls_rwsem);
196 *countp = info->count;
202 static int get_elem_size(int type, int count)
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:
211 case SNDRV_CTL_ELEM_TYPE_IEC958:
212 return sizeof(struct snd_aes_iec958);
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,
221 int *typep, int *countp)
224 int uninitialized_var(count);
225 unsigned int indirect;
227 if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
229 if (get_user(indirect, &data32->indirect))
233 type = get_ctl_type(card, &data->id, &count);
237 if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
238 type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
239 for (i = 0; i < count; i++) {
241 if (get_user(val, &data32->value.integer[i]))
243 data->value.integer.value[i] = val;
246 size = get_elem_size(type, count);
248 printk(KERN_ERR "snd_ioctl32_ctl_elem_value: unknown type %d\n", type);
251 if (copy_from_user(data->value.bytes.data,
252 data32->value.data, size))
261 /* restore the value to 32bit */
262 static int copy_ctl_value_to_user(struct snd_ctl_elem_value32 __user *data32,
263 struct snd_ctl_elem_value *data,
268 if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
269 type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
270 for (i = 0; i < count; i++) {
272 val = data->value.integer.value[i];
273 if (put_user(val, &data32->value.integer[i]))
277 size = get_elem_size(type, count);
278 if (copy_to_user(data32->value.data,
279 data->value.bytes.data, size))
285 static int snd_ctl_elem_read_user_compat(struct snd_card *card,
286 struct snd_ctl_elem_value32 __user *data32)
288 struct snd_ctl_elem_value *data;
289 int err, type, count;
291 data = kzalloc(sizeof(*data), GFP_KERNEL);
295 if ((err = copy_ctl_value_from_user(card, data, data32, &type, &count)) < 0)
298 snd_power_lock(card);
299 err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
301 err = snd_ctl_elem_read(card, data);
302 snd_power_unlock(card);
304 err = copy_ctl_value_to_user(data32, data, type, count);
310 static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file,
311 struct snd_ctl_elem_value32 __user *data32)
313 struct snd_ctl_elem_value *data;
314 struct snd_card *card = file->card;
315 int err, type, count;
317 data = kzalloc(sizeof(*data), GFP_KERNEL);
321 if ((err = copy_ctl_value_from_user(card, data, data32, &type, &count)) < 0)
324 snd_power_lock(card);
325 err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
327 err = snd_ctl_elem_write(card, file, data);
328 snd_power_unlock(card);
330 err = copy_ctl_value_to_user(data32, data, type, count);
336 /* add or replace a user control */
337 static int snd_ctl_elem_add_compat(struct snd_ctl_file *file,
338 struct snd_ctl_elem_info32 __user *data32,
341 struct snd_ctl_elem_info *data;
344 data = kzalloc(sizeof(*data), GFP_KERNEL);
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)))
353 if (get_user(data->owner, &data32->owner) ||
354 get_user(data->type, &data32->type))
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))
364 case SNDRV_CTL_ELEM_TYPE_INTEGER64:
365 if (copy_from_user(&data->value.integer64,
366 &data32->value.integer64,
367 sizeof(data->value.integer64)))
370 case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
371 if (copy_from_user(&data->value.enumerated,
372 &data32->value.enumerated,
373 sizeof(data->value.enumerated)))
379 err = snd_ctl_elem_add(file, data, replace);
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),
394 static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
396 struct snd_ctl_file *ctl;
397 struct snd_kctl_ioctl *p;
398 void __user *argp = compat_ptr(arg);
401 ctl = file->private_data;
402 if (snd_BUG_ON(!ctl || !ctl->card))
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:
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:
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);
432 down_read(&snd_ioctl_rwsem);
433 list_for_each_entry(p, &snd_control_compat_ioctls, list) {
435 err = p->fioctl(ctl->card, ctl, cmd, arg);
436 if (err != -ENOIOCTLCMD) {
437 up_read(&snd_ioctl_rwsem);
442 up_read(&snd_ioctl_rwsem);