1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * compat ioctls for control API
5 * Copyright (c) by Takashi Iwai <tiwai@suse.de>
8 /* this file included from control.c */
10 #include <linux/compat.h>
11 #include <linux/slab.h>
13 struct snd_ctl_elem_list32 {
19 unsigned char reserved[50];
20 } /* don't set packed attribute here */;
22 static int snd_ctl_elem_list_compat(struct snd_card *card,
23 struct snd_ctl_elem_list32 __user *data32)
25 struct snd_ctl_elem_list __user *data;
29 data = compat_alloc_user_space(sizeof(*data));
31 /* offset, space, used, count */
32 if (copy_in_user(data, data32, 4 * sizeof(u32)))
35 if (get_user(ptr, &data32->pids) ||
36 put_user(compat_ptr(ptr), &data->pids))
38 err = snd_ctl_elem_list(card, data);
42 if (copy_in_user(data32, data, 4 * sizeof(u32)))
48 * control element info
49 * it uses union, so the things are not easy..
52 struct snd_ctl_elem_info32 {
53 struct snd_ctl_elem_id id; // the size of struct is same
76 unsigned char reserved[128];
78 unsigned char reserved[64];
79 } __attribute__((packed));
81 static int snd_ctl_elem_info_compat(struct snd_ctl_file *ctl,
82 struct snd_ctl_elem_info32 __user *data32)
84 struct snd_ctl_elem_info *data;
87 data = kzalloc(sizeof(*data), GFP_KERNEL);
93 if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
95 /* we need to copy the item index.
96 * hope this doesn't break anything..
98 if (get_user(data->value.enumerated.item, &data32->value.enumerated.item))
101 err = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0);
104 err = snd_ctl_elem_info(ctl, data);
107 /* restore info to 32bit */
109 /* id, type, access, count */
110 if (copy_to_user(&data32->id, &data->id, sizeof(data->id)) ||
111 copy_to_user(&data32->type, &data->type, 3 * sizeof(u32)))
113 if (put_user(data->owner, &data32->owner))
115 switch (data->type) {
116 case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
117 case SNDRV_CTL_ELEM_TYPE_INTEGER:
118 if (put_user(data->value.integer.min, &data32->value.integer.min) ||
119 put_user(data->value.integer.max, &data32->value.integer.max) ||
120 put_user(data->value.integer.step, &data32->value.integer.step))
123 case SNDRV_CTL_ELEM_TYPE_INTEGER64:
124 if (copy_to_user(&data32->value.integer64,
125 &data->value.integer64,
126 sizeof(data->value.integer64)))
129 case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
130 if (copy_to_user(&data32->value.enumerated,
131 &data->value.enumerated,
132 sizeof(data->value.enumerated)))
145 struct snd_ctl_elem_value32 {
146 struct snd_ctl_elem_id id;
147 unsigned int indirect; /* bit-field causes misalignment */
150 unsigned char data[512];
151 #ifndef CONFIG_X86_64
155 unsigned char reserved[128];
158 #ifdef CONFIG_X86_X32
159 /* x32 has a different alignment for 64bit values from ia32 */
160 struct snd_ctl_elem_value_x32 {
161 struct snd_ctl_elem_id id;
162 unsigned int indirect; /* bit-field causes misalignment */
165 unsigned char data[512];
168 unsigned char reserved[128];
170 #endif /* CONFIG_X86_X32 */
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 void __user *userdata,
222 int *typep, int *countp)
224 struct snd_ctl_elem_value32 __user *data32 = userdata;
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++) {
242 s32 __user *intp = valuep;
244 if (get_user(val, &intp[i]))
246 data->value.integer.value[i] = val;
249 size = get_elem_size(type, count);
251 dev_err(card->dev, "snd_ioctl32_ctl_elem_value: unknown type %d\n", type);
254 if (copy_from_user(data->value.bytes.data, valuep, size))
263 /* restore the value to 32bit */
264 static int copy_ctl_value_to_user(void __user *userdata,
266 struct snd_ctl_elem_value *data,
271 if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
272 type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
273 for (i = 0; i < count; i++) {
274 s32 __user *intp = valuep;
276 val = data->value.integer.value[i];
277 if (put_user(val, &intp[i]))
281 size = get_elem_size(type, count);
282 if (copy_to_user(valuep, data->value.bytes.data, size))
288 static int ctl_elem_read_user(struct snd_card *card,
289 void __user *userdata, void __user *valuep)
291 struct snd_ctl_elem_value *data;
292 int err, type, count;
294 data = kzalloc(sizeof(*data), GFP_KERNEL);
298 err = copy_ctl_value_from_user(card, data, userdata, valuep,
303 err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
306 err = snd_ctl_elem_read(card, data);
309 err = copy_ctl_value_to_user(userdata, valuep, data, type, count);
315 static int ctl_elem_write_user(struct snd_ctl_file *file,
316 void __user *userdata, void __user *valuep)
318 struct snd_ctl_elem_value *data;
319 struct snd_card *card = file->card;
320 int err, type, count;
322 data = kzalloc(sizeof(*data), GFP_KERNEL);
326 err = copy_ctl_value_from_user(card, data, userdata, valuep,
331 err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
334 err = snd_ctl_elem_write(card, file, data);
337 err = copy_ctl_value_to_user(userdata, valuep, data, type, count);
343 static int snd_ctl_elem_read_user_compat(struct snd_card *card,
344 struct snd_ctl_elem_value32 __user *data32)
346 return ctl_elem_read_user(card, data32, &data32->value);
349 static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file,
350 struct snd_ctl_elem_value32 __user *data32)
352 return ctl_elem_write_user(file, data32, &data32->value);
355 #ifdef CONFIG_X86_X32
356 static int snd_ctl_elem_read_user_x32(struct snd_card *card,
357 struct snd_ctl_elem_value_x32 __user *data32)
359 return ctl_elem_read_user(card, data32, &data32->value);
362 static int snd_ctl_elem_write_user_x32(struct snd_ctl_file *file,
363 struct snd_ctl_elem_value_x32 __user *data32)
365 return ctl_elem_write_user(file, data32, &data32->value);
367 #endif /* CONFIG_X86_X32 */
369 /* add or replace a user control */
370 static int snd_ctl_elem_add_compat(struct snd_ctl_file *file,
371 struct snd_ctl_elem_info32 __user *data32,
374 struct snd_ctl_elem_info *data;
377 data = kzalloc(sizeof(*data), GFP_KERNEL);
382 /* id, type, access, count */ \
383 if (copy_from_user(&data->id, &data32->id, sizeof(data->id)) ||
384 copy_from_user(&data->type, &data32->type, 3 * sizeof(u32)))
386 if (get_user(data->owner, &data32->owner))
388 switch (data->type) {
389 case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
390 case SNDRV_CTL_ELEM_TYPE_INTEGER:
391 if (get_user(data->value.integer.min, &data32->value.integer.min) ||
392 get_user(data->value.integer.max, &data32->value.integer.max) ||
393 get_user(data->value.integer.step, &data32->value.integer.step))
396 case SNDRV_CTL_ELEM_TYPE_INTEGER64:
397 if (copy_from_user(&data->value.integer64,
398 &data32->value.integer64,
399 sizeof(data->value.integer64)))
402 case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
403 if (copy_from_user(&data->value.enumerated,
404 &data32->value.enumerated,
405 sizeof(data->value.enumerated)))
407 data->value.enumerated.names_ptr =
408 (uintptr_t)compat_ptr(data->value.enumerated.names_ptr);
413 err = snd_ctl_elem_add(file, data, replace);
420 SNDRV_CTL_IOCTL_ELEM_LIST32 = _IOWR('U', 0x10, struct snd_ctl_elem_list32),
421 SNDRV_CTL_IOCTL_ELEM_INFO32 = _IOWR('U', 0x11, struct snd_ctl_elem_info32),
422 SNDRV_CTL_IOCTL_ELEM_READ32 = _IOWR('U', 0x12, struct snd_ctl_elem_value32),
423 SNDRV_CTL_IOCTL_ELEM_WRITE32 = _IOWR('U', 0x13, struct snd_ctl_elem_value32),
424 SNDRV_CTL_IOCTL_ELEM_ADD32 = _IOWR('U', 0x17, struct snd_ctl_elem_info32),
425 SNDRV_CTL_IOCTL_ELEM_REPLACE32 = _IOWR('U', 0x18, struct snd_ctl_elem_info32),
426 #ifdef CONFIG_X86_X32
427 SNDRV_CTL_IOCTL_ELEM_READ_X32 = _IOWR('U', 0x12, struct snd_ctl_elem_value_x32),
428 SNDRV_CTL_IOCTL_ELEM_WRITE_X32 = _IOWR('U', 0x13, struct snd_ctl_elem_value_x32),
429 #endif /* CONFIG_X86_X32 */
432 static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
434 struct snd_ctl_file *ctl;
435 struct snd_kctl_ioctl *p;
436 void __user *argp = compat_ptr(arg);
439 ctl = file->private_data;
440 if (snd_BUG_ON(!ctl || !ctl->card))
444 case SNDRV_CTL_IOCTL_PVERSION:
445 case SNDRV_CTL_IOCTL_CARD_INFO:
446 case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
447 case SNDRV_CTL_IOCTL_POWER:
448 case SNDRV_CTL_IOCTL_POWER_STATE:
449 case SNDRV_CTL_IOCTL_ELEM_LOCK:
450 case SNDRV_CTL_IOCTL_ELEM_UNLOCK:
451 case SNDRV_CTL_IOCTL_ELEM_REMOVE:
452 case SNDRV_CTL_IOCTL_TLV_READ:
453 case SNDRV_CTL_IOCTL_TLV_WRITE:
454 case SNDRV_CTL_IOCTL_TLV_COMMAND:
455 return snd_ctl_ioctl(file, cmd, (unsigned long)argp);
456 case SNDRV_CTL_IOCTL_ELEM_LIST32:
457 return snd_ctl_elem_list_compat(ctl->card, argp);
458 case SNDRV_CTL_IOCTL_ELEM_INFO32:
459 return snd_ctl_elem_info_compat(ctl, argp);
460 case SNDRV_CTL_IOCTL_ELEM_READ32:
461 return snd_ctl_elem_read_user_compat(ctl->card, argp);
462 case SNDRV_CTL_IOCTL_ELEM_WRITE32:
463 return snd_ctl_elem_write_user_compat(ctl, argp);
464 case SNDRV_CTL_IOCTL_ELEM_ADD32:
465 return snd_ctl_elem_add_compat(ctl, argp, 0);
466 case SNDRV_CTL_IOCTL_ELEM_REPLACE32:
467 return snd_ctl_elem_add_compat(ctl, argp, 1);
468 #ifdef CONFIG_X86_X32
469 case SNDRV_CTL_IOCTL_ELEM_READ_X32:
470 return snd_ctl_elem_read_user_x32(ctl->card, argp);
471 case SNDRV_CTL_IOCTL_ELEM_WRITE_X32:
472 return snd_ctl_elem_write_user_x32(ctl, argp);
473 #endif /* CONFIG_X86_X32 */
476 down_read(&snd_ioctl_rwsem);
477 list_for_each_entry(p, &snd_control_compat_ioctls, list) {
479 err = p->fioctl(ctl->card, ctl, cmd, arg);
480 if (err != -ENOIOCTLCMD) {
481 up_read(&snd_ioctl_rwsem);
486 up_read(&snd_ioctl_rwsem);