Linux 4.15.6
[linux/fpc-iii.git] / sound / core / control_compat.c
bloba848836a5de0468534d5eecfd24adf4bc743f9f2
1 /*
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 {
27 u32 offset;
28 u32 space;
29 u32 used;
30 u32 count;
31 u32 pids;
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;
39 compat_caddr_t ptr;
40 int err;
42 data = compat_alloc_user_space(sizeof(*data));
44 /* offset, space, used, count */
45 if (copy_in_user(data, data32, 4 * sizeof(u32)))
46 return -EFAULT;
47 /* pids */
48 if (get_user(ptr, &data32->pids) ||
49 put_user(compat_ptr(ptr), &data->pids))
50 return -EFAULT;
51 err = snd_ctl_elem_list(card, data);
52 if (err < 0)
53 return err;
54 /* copy the result */
55 if (copy_in_user(data32, data, 4 * sizeof(u32)))
56 return -EFAULT;
57 return 0;
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
67 s32 type;
68 u32 access;
69 u32 count;
70 s32 owner;
71 union {
72 struct {
73 s32 min;
74 s32 max;
75 s32 step;
76 } integer;
77 struct {
78 u64 min;
79 u64 max;
80 u64 step;
81 } integer64;
82 struct {
83 u32 items;
84 u32 item;
85 char name[64];
86 u64 names_ptr;
87 u32 names_length;
88 } enumerated;
89 unsigned char reserved[128];
90 } value;
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;
98 int err;
100 data = kzalloc(sizeof(*data), GFP_KERNEL);
101 if (! data)
102 return -ENOMEM;
104 err = -EFAULT;
105 /* copy id */
106 if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
107 goto error;
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))
112 goto error;
114 err = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0);
115 if (err < 0)
116 goto error;
117 err = snd_ctl_elem_info(ctl, data);
118 if (err < 0)
119 goto error;
120 /* restore info to 32bit */
121 err = -EFAULT;
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)))
125 goto error;
126 if (put_user(data->owner, &data32->owner))
127 goto error;
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))
134 goto error;
135 break;
136 case SNDRV_CTL_ELEM_TYPE_INTEGER64:
137 if (copy_to_user(&data32->value.integer64,
138 &data->value.integer64,
139 sizeof(data->value.integer64)))
140 goto error;
141 break;
142 case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
143 if (copy_to_user(&data32->value.enumerated,
144 &data->value.enumerated,
145 sizeof(data->value.enumerated)))
146 goto error;
147 break;
148 default:
149 break;
151 err = 0;
152 error:
153 kfree(data);
154 return err;
157 /* read / write */
158 struct snd_ctl_elem_value32 {
159 struct snd_ctl_elem_id id;
160 unsigned int indirect; /* bit-field causes misalignment */
161 union {
162 s32 integer[128];
163 unsigned char data[512];
164 #ifndef CONFIG_X86_64
165 s64 integer64[64];
166 #endif
167 } value;
168 unsigned char reserved[128];
171 #ifdef CONFIG_X86_X32
172 /* x32 has a different alignment for 64bit values from ia32 */
173 struct snd_ctl_elem_value_x32 {
174 struct snd_ctl_elem_id id;
175 unsigned int indirect; /* bit-field causes misalignment */
176 union {
177 s32 integer[128];
178 unsigned char data[512];
179 s64 integer64[64];
180 } value;
181 unsigned char reserved[128];
183 #endif /* CONFIG_X86_X32 */
185 /* get the value type and count of the control */
186 static int get_ctl_type(struct snd_card *card, struct snd_ctl_elem_id *id,
187 int *countp)
189 struct snd_kcontrol *kctl;
190 struct snd_ctl_elem_info *info;
191 int err;
193 down_read(&card->controls_rwsem);
194 kctl = snd_ctl_find_id(card, id);
195 if (! kctl) {
196 up_read(&card->controls_rwsem);
197 return -ENOENT;
199 info = kzalloc(sizeof(*info), GFP_KERNEL);
200 if (info == NULL) {
201 up_read(&card->controls_rwsem);
202 return -ENOMEM;
204 info->id = *id;
205 err = kctl->info(kctl, info);
206 up_read(&card->controls_rwsem);
207 if (err >= 0) {
208 err = info->type;
209 *countp = info->count;
211 kfree(info);
212 return err;
215 static int get_elem_size(int type, int count)
217 switch (type) {
218 case SNDRV_CTL_ELEM_TYPE_INTEGER64:
219 return sizeof(s64) * count;
220 case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
221 return sizeof(int) * count;
222 case SNDRV_CTL_ELEM_TYPE_BYTES:
223 return 512;
224 case SNDRV_CTL_ELEM_TYPE_IEC958:
225 return sizeof(struct snd_aes_iec958);
226 default:
227 return -1;
231 static int copy_ctl_value_from_user(struct snd_card *card,
232 struct snd_ctl_elem_value *data,
233 void __user *userdata,
234 void __user *valuep,
235 int *typep, int *countp)
237 struct snd_ctl_elem_value32 __user *data32 = userdata;
238 int i, type, size;
239 int uninitialized_var(count);
240 unsigned int indirect;
242 if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
243 return -EFAULT;
244 if (get_user(indirect, &data32->indirect))
245 return -EFAULT;
246 if (indirect)
247 return -EINVAL;
248 type = get_ctl_type(card, &data->id, &count);
249 if (type < 0)
250 return type;
252 if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
253 type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
254 for (i = 0; i < count; i++) {
255 s32 __user *intp = valuep;
256 int val;
257 if (get_user(val, &intp[i]))
258 return -EFAULT;
259 data->value.integer.value[i] = val;
261 } else {
262 size = get_elem_size(type, count);
263 if (size < 0) {
264 dev_err(card->dev, "snd_ioctl32_ctl_elem_value: unknown type %d\n", type);
265 return -EINVAL;
267 if (copy_from_user(data->value.bytes.data, valuep, size))
268 return -EFAULT;
271 *typep = type;
272 *countp = count;
273 return 0;
276 /* restore the value to 32bit */
277 static int copy_ctl_value_to_user(void __user *userdata,
278 void __user *valuep,
279 struct snd_ctl_elem_value *data,
280 int type, int count)
282 int i, size;
284 if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
285 type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
286 for (i = 0; i < count; i++) {
287 s32 __user *intp = valuep;
288 int val;
289 val = data->value.integer.value[i];
290 if (put_user(val, &intp[i]))
291 return -EFAULT;
293 } else {
294 size = get_elem_size(type, count);
295 if (copy_to_user(valuep, data->value.bytes.data, size))
296 return -EFAULT;
298 return 0;
301 static int ctl_elem_read_user(struct snd_card *card,
302 void __user *userdata, void __user *valuep)
304 struct snd_ctl_elem_value *data;
305 int err, type, count;
307 data = kzalloc(sizeof(*data), GFP_KERNEL);
308 if (data == NULL)
309 return -ENOMEM;
311 err = copy_ctl_value_from_user(card, data, userdata, valuep,
312 &type, &count);
313 if (err < 0)
314 goto error;
316 err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
317 if (err < 0)
318 goto error;
319 err = snd_ctl_elem_read(card, data);
320 if (err < 0)
321 goto error;
322 err = copy_ctl_value_to_user(userdata, valuep, data, type, count);
323 error:
324 kfree(data);
325 return err;
328 static int ctl_elem_write_user(struct snd_ctl_file *file,
329 void __user *userdata, void __user *valuep)
331 struct snd_ctl_elem_value *data;
332 struct snd_card *card = file->card;
333 int err, type, count;
335 data = kzalloc(sizeof(*data), GFP_KERNEL);
336 if (data == NULL)
337 return -ENOMEM;
339 err = copy_ctl_value_from_user(card, data, userdata, valuep,
340 &type, &count);
341 if (err < 0)
342 goto error;
344 err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
345 if (err < 0)
346 goto error;
347 err = snd_ctl_elem_write(card, file, data);
348 if (err < 0)
349 goto error;
350 err = copy_ctl_value_to_user(userdata, valuep, data, type, count);
351 error:
352 kfree(data);
353 return err;
356 static int snd_ctl_elem_read_user_compat(struct snd_card *card,
357 struct snd_ctl_elem_value32 __user *data32)
359 return ctl_elem_read_user(card, data32, &data32->value);
362 static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file,
363 struct snd_ctl_elem_value32 __user *data32)
365 return ctl_elem_write_user(file, data32, &data32->value);
368 #ifdef CONFIG_X86_X32
369 static int snd_ctl_elem_read_user_x32(struct snd_card *card,
370 struct snd_ctl_elem_value_x32 __user *data32)
372 return ctl_elem_read_user(card, data32, &data32->value);
375 static int snd_ctl_elem_write_user_x32(struct snd_ctl_file *file,
376 struct snd_ctl_elem_value_x32 __user *data32)
378 return ctl_elem_write_user(file, data32, &data32->value);
380 #endif /* CONFIG_X86_X32 */
382 /* add or replace a user control */
383 static int snd_ctl_elem_add_compat(struct snd_ctl_file *file,
384 struct snd_ctl_elem_info32 __user *data32,
385 int replace)
387 struct snd_ctl_elem_info *data;
388 int err;
390 data = kzalloc(sizeof(*data), GFP_KERNEL);
391 if (! data)
392 return -ENOMEM;
394 err = -EFAULT;
395 /* id, type, access, count */ \
396 if (copy_from_user(&data->id, &data32->id, sizeof(data->id)) ||
397 copy_from_user(&data->type, &data32->type, 3 * sizeof(u32)))
398 goto error;
399 if (get_user(data->owner, &data32->owner) ||
400 get_user(data->type, &data32->type))
401 goto error;
402 switch (data->type) {
403 case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
404 case SNDRV_CTL_ELEM_TYPE_INTEGER:
405 if (get_user(data->value.integer.min, &data32->value.integer.min) ||
406 get_user(data->value.integer.max, &data32->value.integer.max) ||
407 get_user(data->value.integer.step, &data32->value.integer.step))
408 goto error;
409 break;
410 case SNDRV_CTL_ELEM_TYPE_INTEGER64:
411 if (copy_from_user(&data->value.integer64,
412 &data32->value.integer64,
413 sizeof(data->value.integer64)))
414 goto error;
415 break;
416 case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
417 if (copy_from_user(&data->value.enumerated,
418 &data32->value.enumerated,
419 sizeof(data->value.enumerated)))
420 goto error;
421 data->value.enumerated.names_ptr =
422 (uintptr_t)compat_ptr(data->value.enumerated.names_ptr);
423 break;
424 default:
425 break;
427 err = snd_ctl_elem_add(file, data, replace);
428 error:
429 kfree(data);
430 return err;
433 enum {
434 SNDRV_CTL_IOCTL_ELEM_LIST32 = _IOWR('U', 0x10, struct snd_ctl_elem_list32),
435 SNDRV_CTL_IOCTL_ELEM_INFO32 = _IOWR('U', 0x11, struct snd_ctl_elem_info32),
436 SNDRV_CTL_IOCTL_ELEM_READ32 = _IOWR('U', 0x12, struct snd_ctl_elem_value32),
437 SNDRV_CTL_IOCTL_ELEM_WRITE32 = _IOWR('U', 0x13, struct snd_ctl_elem_value32),
438 SNDRV_CTL_IOCTL_ELEM_ADD32 = _IOWR('U', 0x17, struct snd_ctl_elem_info32),
439 SNDRV_CTL_IOCTL_ELEM_REPLACE32 = _IOWR('U', 0x18, struct snd_ctl_elem_info32),
440 #ifdef CONFIG_X86_X32
441 SNDRV_CTL_IOCTL_ELEM_READ_X32 = _IOWR('U', 0x12, struct snd_ctl_elem_value_x32),
442 SNDRV_CTL_IOCTL_ELEM_WRITE_X32 = _IOWR('U', 0x13, struct snd_ctl_elem_value_x32),
443 #endif /* CONFIG_X86_X32 */
446 static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
448 struct snd_ctl_file *ctl;
449 struct snd_kctl_ioctl *p;
450 void __user *argp = compat_ptr(arg);
451 int err;
453 ctl = file->private_data;
454 if (snd_BUG_ON(!ctl || !ctl->card))
455 return -ENXIO;
457 switch (cmd) {
458 case SNDRV_CTL_IOCTL_PVERSION:
459 case SNDRV_CTL_IOCTL_CARD_INFO:
460 case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
461 case SNDRV_CTL_IOCTL_POWER:
462 case SNDRV_CTL_IOCTL_POWER_STATE:
463 case SNDRV_CTL_IOCTL_ELEM_LOCK:
464 case SNDRV_CTL_IOCTL_ELEM_UNLOCK:
465 case SNDRV_CTL_IOCTL_ELEM_REMOVE:
466 case SNDRV_CTL_IOCTL_TLV_READ:
467 case SNDRV_CTL_IOCTL_TLV_WRITE:
468 case SNDRV_CTL_IOCTL_TLV_COMMAND:
469 return snd_ctl_ioctl(file, cmd, (unsigned long)argp);
470 case SNDRV_CTL_IOCTL_ELEM_LIST32:
471 return snd_ctl_elem_list_compat(ctl->card, argp);
472 case SNDRV_CTL_IOCTL_ELEM_INFO32:
473 return snd_ctl_elem_info_compat(ctl, argp);
474 case SNDRV_CTL_IOCTL_ELEM_READ32:
475 return snd_ctl_elem_read_user_compat(ctl->card, argp);
476 case SNDRV_CTL_IOCTL_ELEM_WRITE32:
477 return snd_ctl_elem_write_user_compat(ctl, argp);
478 case SNDRV_CTL_IOCTL_ELEM_ADD32:
479 return snd_ctl_elem_add_compat(ctl, argp, 0);
480 case SNDRV_CTL_IOCTL_ELEM_REPLACE32:
481 return snd_ctl_elem_add_compat(ctl, argp, 1);
482 #ifdef CONFIG_X86_X32
483 case SNDRV_CTL_IOCTL_ELEM_READ_X32:
484 return snd_ctl_elem_read_user_x32(ctl->card, argp);
485 case SNDRV_CTL_IOCTL_ELEM_WRITE_X32:
486 return snd_ctl_elem_write_user_x32(ctl, argp);
487 #endif /* CONFIG_X86_X32 */
490 down_read(&snd_ioctl_rwsem);
491 list_for_each_entry(p, &snd_control_compat_ioctls, list) {
492 if (p->fioctl) {
493 err = p->fioctl(ctl->card, ctl, cmd, arg);
494 if (err != -ENOIOCTLCMD) {
495 up_read(&snd_ioctl_rwsem);
496 return err;
500 up_read(&snd_ioctl_rwsem);
501 return -ENOIOCTLCMD;