fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / sound / core / control_compat.c
blob9311ca397bbc20ed62d3c5e092dd6df5ed3b1d8f
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>
25 struct snd_ctl_elem_list32 {
26 u32 offset;
27 u32 space;
28 u32 used;
29 u32 count;
30 u32 pids;
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;
38 compat_caddr_t ptr;
39 int err;
41 data = compat_alloc_user_space(sizeof(*data));
43 /* offset, space, used, count */
44 if (copy_in_user(data, data32, 4 * sizeof(u32)))
45 return -EFAULT;
46 /* pids */
47 if (get_user(ptr, &data32->pids) ||
48 put_user(compat_ptr(ptr), &data->pids))
49 return -EFAULT;
50 err = snd_ctl_elem_list(card, data);
51 if (err < 0)
52 return err;
53 /* copy the result */
54 if (copy_in_user(data32, data, 4 * sizeof(u32)))
55 return -EFAULT;
56 return 0;
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
66 s32 type;
67 u32 access;
68 u32 count;
69 s32 owner;
70 union {
71 struct {
72 s32 min;
73 s32 max;
74 s32 step;
75 } integer;
76 struct {
77 u64 min;
78 u64 max;
79 u64 step;
80 } integer64;
81 struct {
82 u32 items;
83 u32 item;
84 char name[64];
85 } enumerated;
86 unsigned char reserved[128];
87 } value;
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;
95 int err;
97 data = kzalloc(sizeof(*data), GFP_KERNEL);
98 if (! data)
99 return -ENOMEM;
101 err = -EFAULT;
102 /* copy id */
103 if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
104 goto error;
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))
109 goto error;
111 snd_power_lock(ctl->card);
112 err = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0);
113 if (err >= 0)
114 err = snd_ctl_elem_info(ctl, data);
115 snd_power_unlock(ctl->card);
117 if (err < 0)
118 goto error;
119 /* restore info to 32bit */
120 err = -EFAULT;
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)))
124 goto error;
125 if (put_user(data->owner, &data32->owner))
126 goto error;
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))
133 goto error;
134 break;
135 case SNDRV_CTL_ELEM_TYPE_INTEGER64:
136 if (copy_to_user(&data32->value.integer64,
137 &data->value.integer64,
138 sizeof(data->value.integer64)))
139 goto error;
140 break;
141 case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
142 if (copy_to_user(&data32->value.enumerated,
143 &data->value.enumerated,
144 sizeof(data->value.enumerated)))
145 goto error;
146 break;
147 default:
148 break;
150 err = 0;
151 error:
152 kfree(data);
153 return err;
156 /* read / write */
157 struct snd_ctl_elem_value32 {
158 struct snd_ctl_elem_id id;
159 unsigned int indirect; /* bit-field causes misalignment */
160 union {
161 s32 integer[128];
162 unsigned char data[512];
163 #ifndef CONFIG_X86_64
164 s64 integer64[64];
165 #endif
166 } value;
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,
173 int *countp)
175 struct snd_kcontrol *kctl;
176 struct snd_ctl_elem_info *info;
177 int err;
179 down_read(&card->controls_rwsem);
180 kctl = snd_ctl_find_id(card, id);
181 if (! kctl) {
182 up_read(&card->controls_rwsem);
183 return -ENXIO;
185 info = kzalloc(sizeof(*info), GFP_KERNEL);
186 if (info == NULL) {
187 up_read(&card->controls_rwsem);
188 return -ENOMEM;
190 info->id = *id;
191 err = kctl->info(kctl, info);
192 up_read(&card->controls_rwsem);
193 if (err >= 0) {
194 err = info->type;
195 *countp = info->count;
197 kfree(info);
198 return err;
201 static int get_elem_size(int type, int count)
203 switch (type) {
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:
209 return 512;
210 case SNDRV_CTL_ELEM_TYPE_IEC958:
211 return sizeof(struct snd_aes_iec958);
212 default:
213 return -1;
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)
222 int i, type, count, size;
223 unsigned int indirect;
225 if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
226 return -EFAULT;
227 if (get_user(indirect, &data32->indirect))
228 return -EFAULT;
229 if (indirect)
230 return -EINVAL;
231 type = get_ctl_type(card, &data->id, &count);
232 if (type < 0)
233 return type;
235 if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
236 type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
237 for (i = 0; i < count; i++) {
238 int val;
239 if (get_user(val, &data32->value.integer[i]))
240 return -EFAULT;
241 data->value.integer.value[i] = val;
243 } else {
244 size = get_elem_size(type, count);
245 if (size < 0) {
246 printk(KERN_ERR "snd_ioctl32_ctl_elem_value: unknown type %d\n", type);
247 return -EINVAL;
249 if (copy_from_user(data->value.bytes.data,
250 data32->value.data, size))
251 return -EFAULT;
254 *typep = type;
255 *countp = count;
256 return 0;
259 /* restore the value to 32bit */
260 static int copy_ctl_value_to_user(struct snd_ctl_elem_value32 __user *data32,
261 struct snd_ctl_elem_value *data,
262 int type, int count)
264 int i, size;
266 if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
267 type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
268 for (i = 0; i < count; i++) {
269 int val;
270 val = data->value.integer.value[i];
271 if (put_user(val, &data32->value.integer[i]))
272 return -EFAULT;
274 } else {
275 size = get_elem_size(type, count);
276 if (copy_to_user(data32->value.data,
277 data->value.bytes.data, size))
278 return -EFAULT;
280 return 0;
283 static int snd_ctl_elem_read_user_compat(struct snd_card *card,
284 struct snd_ctl_elem_value32 __user *data32)
286 struct snd_ctl_elem_value *data;
287 int err, type, count;
289 data = kzalloc(sizeof(*data), GFP_KERNEL);
290 if (data == NULL)
291 return -ENOMEM;
293 if ((err = copy_ctl_value_from_user(card, data, data32, &type, &count)) < 0)
294 goto error;
296 snd_power_lock(card);
297 err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
298 if (err >= 0)
299 err = snd_ctl_elem_read(card, data);
300 snd_power_unlock(card);
301 if (err >= 0)
302 err = copy_ctl_value_to_user(data32, data, type, count);
303 error:
304 kfree(data);
305 return err;
308 static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file,
309 struct snd_ctl_elem_value32 __user *data32)
311 struct snd_ctl_elem_value *data;
312 struct snd_card *card = file->card;
313 int err, type, count;
315 data = kzalloc(sizeof(*data), GFP_KERNEL);
316 if (data == NULL)
317 return -ENOMEM;
319 if ((err = copy_ctl_value_from_user(card, data, data32, &type, &count)) < 0)
320 goto error;
322 snd_power_lock(card);
323 err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
324 if (err >= 0)
325 err = snd_ctl_elem_write(card, file, data);
326 snd_power_unlock(card);
327 if (err >= 0)
328 err = copy_ctl_value_to_user(data32, data, type, count);
329 error:
330 kfree(data);
331 return err;
334 /* add or replace a user control */
335 static int snd_ctl_elem_add_compat(struct snd_ctl_file *file,
336 struct snd_ctl_elem_info32 __user *data32,
337 int replace)
339 struct snd_ctl_elem_info *data;
340 int err;
342 data = kzalloc(sizeof(*data), GFP_KERNEL);
343 if (! data)
344 return -ENOMEM;
346 err = -EFAULT;
347 /* id, type, access, count */ \
348 if (copy_from_user(&data->id, &data32->id, sizeof(data->id)) ||
349 copy_from_user(&data->type, &data32->type, 3 * sizeof(u32)))
350 goto error;
351 if (get_user(data->owner, &data32->owner) ||
352 get_user(data->type, &data32->type))
353 goto error;
354 switch (data->type) {
355 case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
356 case SNDRV_CTL_ELEM_TYPE_INTEGER:
357 if (get_user(data->value.integer.min, &data32->value.integer.min) ||
358 get_user(data->value.integer.max, &data32->value.integer.max) ||
359 get_user(data->value.integer.step, &data32->value.integer.step))
360 goto error;
361 break;
362 case SNDRV_CTL_ELEM_TYPE_INTEGER64:
363 if (copy_from_user(&data->value.integer64,
364 &data32->value.integer64,
365 sizeof(data->value.integer64)))
366 goto error;
367 break;
368 case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
369 if (copy_from_user(&data->value.enumerated,
370 &data32->value.enumerated,
371 sizeof(data->value.enumerated)))
372 goto error;
373 break;
374 default:
375 break;
377 err = snd_ctl_elem_add(file, data, replace);
378 error:
379 kfree(data);
380 return err;
383 enum {
384 SNDRV_CTL_IOCTL_ELEM_LIST32 = _IOWR('U', 0x10, struct snd_ctl_elem_list32),
385 SNDRV_CTL_IOCTL_ELEM_INFO32 = _IOWR('U', 0x11, struct snd_ctl_elem_info32),
386 SNDRV_CTL_IOCTL_ELEM_READ32 = _IOWR('U', 0x12, struct snd_ctl_elem_value32),
387 SNDRV_CTL_IOCTL_ELEM_WRITE32 = _IOWR('U', 0x13, struct snd_ctl_elem_value32),
388 SNDRV_CTL_IOCTL_ELEM_ADD32 = _IOWR('U', 0x17, struct snd_ctl_elem_info32),
389 SNDRV_CTL_IOCTL_ELEM_REPLACE32 = _IOWR('U', 0x18, struct snd_ctl_elem_info32),
392 static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
394 struct snd_ctl_file *ctl;
395 struct snd_kctl_ioctl *p;
396 void __user *argp = compat_ptr(arg);
397 int err;
399 ctl = file->private_data;
400 snd_assert(ctl && ctl->card, return -ENXIO);
402 switch (cmd) {
403 case SNDRV_CTL_IOCTL_PVERSION:
404 case SNDRV_CTL_IOCTL_CARD_INFO:
405 case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
406 case SNDRV_CTL_IOCTL_POWER:
407 case SNDRV_CTL_IOCTL_POWER_STATE:
408 case SNDRV_CTL_IOCTL_ELEM_LOCK:
409 case SNDRV_CTL_IOCTL_ELEM_UNLOCK:
410 case SNDRV_CTL_IOCTL_ELEM_REMOVE:
411 case SNDRV_CTL_IOCTL_TLV_READ:
412 case SNDRV_CTL_IOCTL_TLV_WRITE:
413 case SNDRV_CTL_IOCTL_TLV_COMMAND:
414 return snd_ctl_ioctl(file, cmd, (unsigned long)argp);
415 case SNDRV_CTL_IOCTL_ELEM_LIST32:
416 return snd_ctl_elem_list_compat(ctl->card, argp);
417 case SNDRV_CTL_IOCTL_ELEM_INFO32:
418 return snd_ctl_elem_info_compat(ctl, argp);
419 case SNDRV_CTL_IOCTL_ELEM_READ32:
420 return snd_ctl_elem_read_user_compat(ctl->card, argp);
421 case SNDRV_CTL_IOCTL_ELEM_WRITE32:
422 return snd_ctl_elem_write_user_compat(ctl, argp);
423 case SNDRV_CTL_IOCTL_ELEM_ADD32:
424 return snd_ctl_elem_add_compat(ctl, argp, 0);
425 case SNDRV_CTL_IOCTL_ELEM_REPLACE32:
426 return snd_ctl_elem_add_compat(ctl, argp, 1);
429 down_read(&snd_ioctl_rwsem);
430 list_for_each_entry(p, &snd_control_compat_ioctls, list) {
431 if (p->fioctl) {
432 err = p->fioctl(ctl->card, ctl, cmd, arg);
433 if (err != -ENOIOCTLCMD) {
434 up_read(&snd_ioctl_rwsem);
435 return err;
439 up_read(&snd_ioctl_rwsem);
440 return -ENOIOCTLCMD;