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 data = {};
29 /* offset, space, used, count */
30 if (copy_from_user(&data, data32, 4 * sizeof(u32)))
33 if (get_user(ptr, &data32->pids))
35 data.pids = compat_ptr(ptr);
36 err = snd_ctl_elem_list(card, &data);
40 if (copy_to_user(data32, &data, 4 * sizeof(u32)))
46 * control element info
47 * it uses union, so the things are not easy..
50 struct snd_ctl_elem_info32 {
51 struct snd_ctl_elem_id id; // the size of struct is same
74 unsigned char reserved[128];
76 unsigned char reserved[64];
77 } __attribute__((packed));
79 static int snd_ctl_elem_info_compat(struct snd_ctl_file *ctl,
80 struct snd_ctl_elem_info32 __user *data32)
82 struct snd_ctl_elem_info *data;
85 data = kzalloc(sizeof(*data), GFP_KERNEL);
91 if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
93 /* we need to copy the item index.
94 * hope this doesn't break anything..
96 if (get_user(data->value.enumerated.item, &data32->value.enumerated.item))
99 err = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0);
102 err = snd_ctl_elem_info(ctl, data);
105 /* restore info to 32bit */
107 /* id, type, access, count */
108 if (copy_to_user(&data32->id, &data->id, sizeof(data->id)) ||
109 copy_to_user(&data32->type, &data->type, 3 * sizeof(u32)))
111 if (put_user(data->owner, &data32->owner))
113 switch (data->type) {
114 case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
115 case SNDRV_CTL_ELEM_TYPE_INTEGER:
116 if (put_user(data->value.integer.min, &data32->value.integer.min) ||
117 put_user(data->value.integer.max, &data32->value.integer.max) ||
118 put_user(data->value.integer.step, &data32->value.integer.step))
121 case SNDRV_CTL_ELEM_TYPE_INTEGER64:
122 if (copy_to_user(&data32->value.integer64,
123 &data->value.integer64,
124 sizeof(data->value.integer64)))
127 case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
128 if (copy_to_user(&data32->value.enumerated,
129 &data->value.enumerated,
130 sizeof(data->value.enumerated)))
143 struct snd_ctl_elem_value32 {
144 struct snd_ctl_elem_id id;
145 unsigned int indirect; /* bit-field causes misalignment */
148 unsigned char data[512];
149 #ifndef CONFIG_X86_64
153 unsigned char reserved[128];
156 #ifdef CONFIG_X86_X32
157 /* x32 has a different alignment for 64bit values from ia32 */
158 struct snd_ctl_elem_value_x32 {
159 struct snd_ctl_elem_id id;
160 unsigned int indirect; /* bit-field causes misalignment */
163 unsigned char data[512];
166 unsigned char reserved[128];
168 #endif /* CONFIG_X86_X32 */
170 /* get the value type and count of the control */
171 static int get_ctl_type(struct snd_card *card, struct snd_ctl_elem_id *id,
174 struct snd_kcontrol *kctl;
175 struct snd_ctl_elem_info *info;
178 down_read(&card->controls_rwsem);
179 kctl = snd_ctl_find_id(card, id);
181 up_read(&card->controls_rwsem);
184 info = kzalloc(sizeof(*info), GFP_KERNEL);
186 up_read(&card->controls_rwsem);
190 err = kctl->info(kctl, info);
191 up_read(&card->controls_rwsem);
194 *countp = info->count;
200 static int get_elem_size(int type, int count)
203 case SNDRV_CTL_ELEM_TYPE_INTEGER64:
204 return sizeof(s64) * count;
205 case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
206 return sizeof(int) * count;
207 case SNDRV_CTL_ELEM_TYPE_BYTES:
209 case SNDRV_CTL_ELEM_TYPE_IEC958:
210 return sizeof(struct snd_aes_iec958);
216 static int copy_ctl_value_from_user(struct snd_card *card,
217 struct snd_ctl_elem_value *data,
218 void __user *userdata,
220 int *typep, int *countp)
222 struct snd_ctl_elem_value32 __user *data32 = userdata;
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++) {
240 s32 __user *intp = valuep;
242 if (get_user(val, &intp[i]))
244 data->value.integer.value[i] = val;
247 size = get_elem_size(type, count);
249 dev_err(card->dev, "snd_ioctl32_ctl_elem_value: unknown type %d\n", type);
252 if (copy_from_user(data->value.bytes.data, valuep, size))
261 /* restore the value to 32bit */
262 static int copy_ctl_value_to_user(void __user *userdata,
264 struct snd_ctl_elem_value *data,
267 struct snd_ctl_elem_value32 __user *data32 = userdata;
270 if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
271 type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
272 for (i = 0; i < count; i++) {
273 s32 __user *intp = valuep;
275 val = data->value.integer.value[i];
276 if (put_user(val, &intp[i]))
280 size = get_elem_size(type, count);
281 if (copy_to_user(valuep, data->value.bytes.data, size))
284 if (copy_to_user(&data32->id, &data->id, sizeof(data32->id)))
289 static int ctl_elem_read_user(struct snd_card *card,
290 void __user *userdata, void __user *valuep)
292 struct snd_ctl_elem_value *data;
293 int err, type, count;
295 data = kzalloc(sizeof(*data), GFP_KERNEL);
299 err = copy_ctl_value_from_user(card, data, userdata, valuep,
304 err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
307 down_read(&card->controls_rwsem);
308 err = snd_ctl_elem_read(card, data);
309 up_read(&card->controls_rwsem);
312 err = copy_ctl_value_to_user(userdata, valuep, data, type, count);
318 static int ctl_elem_write_user(struct snd_ctl_file *file,
319 void __user *userdata, void __user *valuep)
321 struct snd_ctl_elem_value *data;
322 struct snd_card *card = file->card;
323 int err, type, count;
325 data = kzalloc(sizeof(*data), GFP_KERNEL);
329 err = copy_ctl_value_from_user(card, data, userdata, valuep,
334 err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
337 down_write(&card->controls_rwsem);
338 err = snd_ctl_elem_write(card, file, data);
339 up_write(&card->controls_rwsem);
342 err = copy_ctl_value_to_user(userdata, valuep, data, type, count);
348 static int snd_ctl_elem_read_user_compat(struct snd_card *card,
349 struct snd_ctl_elem_value32 __user *data32)
351 return ctl_elem_read_user(card, data32, &data32->value);
354 static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file,
355 struct snd_ctl_elem_value32 __user *data32)
357 return ctl_elem_write_user(file, data32, &data32->value);
360 #ifdef CONFIG_X86_X32
361 static int snd_ctl_elem_read_user_x32(struct snd_card *card,
362 struct snd_ctl_elem_value_x32 __user *data32)
364 return ctl_elem_read_user(card, data32, &data32->value);
367 static int snd_ctl_elem_write_user_x32(struct snd_ctl_file *file,
368 struct snd_ctl_elem_value_x32 __user *data32)
370 return ctl_elem_write_user(file, data32, &data32->value);
372 #endif /* CONFIG_X86_X32 */
374 /* add or replace a user control */
375 static int snd_ctl_elem_add_compat(struct snd_ctl_file *file,
376 struct snd_ctl_elem_info32 __user *data32,
379 struct snd_ctl_elem_info *data;
382 data = kzalloc(sizeof(*data), GFP_KERNEL);
387 /* id, type, access, count */ \
388 if (copy_from_user(&data->id, &data32->id, sizeof(data->id)) ||
389 copy_from_user(&data->type, &data32->type, 3 * sizeof(u32)))
391 if (get_user(data->owner, &data32->owner))
393 switch (data->type) {
394 case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
395 case SNDRV_CTL_ELEM_TYPE_INTEGER:
396 if (get_user(data->value.integer.min, &data32->value.integer.min) ||
397 get_user(data->value.integer.max, &data32->value.integer.max) ||
398 get_user(data->value.integer.step, &data32->value.integer.step))
401 case SNDRV_CTL_ELEM_TYPE_INTEGER64:
402 if (copy_from_user(&data->value.integer64,
403 &data32->value.integer64,
404 sizeof(data->value.integer64)))
407 case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
408 if (copy_from_user(&data->value.enumerated,
409 &data32->value.enumerated,
410 sizeof(data->value.enumerated)))
412 data->value.enumerated.names_ptr =
413 (uintptr_t)compat_ptr(data->value.enumerated.names_ptr);
418 err = snd_ctl_elem_add(file, data, replace);
425 SNDRV_CTL_IOCTL_ELEM_LIST32 = _IOWR('U', 0x10, struct snd_ctl_elem_list32),
426 SNDRV_CTL_IOCTL_ELEM_INFO32 = _IOWR('U', 0x11, struct snd_ctl_elem_info32),
427 SNDRV_CTL_IOCTL_ELEM_READ32 = _IOWR('U', 0x12, struct snd_ctl_elem_value32),
428 SNDRV_CTL_IOCTL_ELEM_WRITE32 = _IOWR('U', 0x13, struct snd_ctl_elem_value32),
429 SNDRV_CTL_IOCTL_ELEM_ADD32 = _IOWR('U', 0x17, struct snd_ctl_elem_info32),
430 SNDRV_CTL_IOCTL_ELEM_REPLACE32 = _IOWR('U', 0x18, struct snd_ctl_elem_info32),
431 #ifdef CONFIG_X86_X32
432 SNDRV_CTL_IOCTL_ELEM_READ_X32 = _IOWR('U', 0x12, struct snd_ctl_elem_value_x32),
433 SNDRV_CTL_IOCTL_ELEM_WRITE_X32 = _IOWR('U', 0x13, struct snd_ctl_elem_value_x32),
434 #endif /* CONFIG_X86_X32 */
437 static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
439 struct snd_ctl_file *ctl;
440 struct snd_kctl_ioctl *p;
441 void __user *argp = compat_ptr(arg);
444 ctl = file->private_data;
445 if (snd_BUG_ON(!ctl || !ctl->card))
449 case SNDRV_CTL_IOCTL_PVERSION:
450 case SNDRV_CTL_IOCTL_CARD_INFO:
451 case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
452 case SNDRV_CTL_IOCTL_POWER:
453 case SNDRV_CTL_IOCTL_POWER_STATE:
454 case SNDRV_CTL_IOCTL_ELEM_LOCK:
455 case SNDRV_CTL_IOCTL_ELEM_UNLOCK:
456 case SNDRV_CTL_IOCTL_ELEM_REMOVE:
457 case SNDRV_CTL_IOCTL_TLV_READ:
458 case SNDRV_CTL_IOCTL_TLV_WRITE:
459 case SNDRV_CTL_IOCTL_TLV_COMMAND:
460 return snd_ctl_ioctl(file, cmd, (unsigned long)argp);
461 case SNDRV_CTL_IOCTL_ELEM_LIST32:
462 return snd_ctl_elem_list_compat(ctl->card, argp);
463 case SNDRV_CTL_IOCTL_ELEM_INFO32:
464 return snd_ctl_elem_info_compat(ctl, argp);
465 case SNDRV_CTL_IOCTL_ELEM_READ32:
466 return snd_ctl_elem_read_user_compat(ctl->card, argp);
467 case SNDRV_CTL_IOCTL_ELEM_WRITE32:
468 return snd_ctl_elem_write_user_compat(ctl, argp);
469 case SNDRV_CTL_IOCTL_ELEM_ADD32:
470 return snd_ctl_elem_add_compat(ctl, argp, 0);
471 case SNDRV_CTL_IOCTL_ELEM_REPLACE32:
472 return snd_ctl_elem_add_compat(ctl, argp, 1);
473 #ifdef CONFIG_X86_X32
474 case SNDRV_CTL_IOCTL_ELEM_READ_X32:
475 return snd_ctl_elem_read_user_x32(ctl->card, argp);
476 case SNDRV_CTL_IOCTL_ELEM_WRITE_X32:
477 return snd_ctl_elem_write_user_x32(ctl, argp);
478 #endif /* CONFIG_X86_X32 */
481 down_read(&snd_ioctl_rwsem);
482 list_for_each_entry(p, &snd_control_compat_ioctls, list) {
484 err = p->fioctl(ctl->card, ctl, cmd, arg);
485 if (err != -ENOIOCTLCMD) {
486 up_read(&snd_ioctl_rwsem);
491 up_read(&snd_ioctl_rwsem);