1/* 2 * compat ioctls for control API 3 * 4 * Copyright (c) by Takashi Iwai <tiwai@suse.de> 5 * 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. 10 * 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. 15 * 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 19 */ 20 21/* this file included from control.c */ 22 23#include <linux/compat.h> 24 25struct 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 */; 33 34static int snd_ctl_elem_list_compat(struct snd_card *card, 35 struct snd_ctl_elem_list32 __user *data32) 36{ 37 struct snd_ctl_elem_list __user *data; 38 compat_caddr_t ptr; 39 int err; 40 41 data = compat_alloc_user_space(sizeof(*data)); 42 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; 57} 58 59/* 60 * control element info 61 * it uses union, so the things are not easy.. 62 */ 63 64struct 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)); 90 91static int snd_ctl_elem_info_compat(struct snd_ctl_file *ctl, 92 struct snd_ctl_elem_info32 __user *data32) 93{ 94 struct snd_ctl_elem_info *data; 95 int err; 96 97 data = kzalloc(sizeof(*data), GFP_KERNEL); 98 if (! data) 99 return -ENOMEM; 100 101 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.. 107 */ 108 if (get_user(data->value.enumerated.item, &data32->value.enumerated.item)) 109 goto error; 110 111 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); 116 117 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; 149 } 150 err = 0; 151 error: 152 kfree(data); 153 return err; 154} 155 156/* read / write */ 157struct 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]; 168}; 169 170 171/* get the value type and count of the control */ 172static int get_ctl_type(struct snd_card *card, struct snd_ctl_elem_id *id, 173 int *countp) 174{ 175 struct snd_kcontrol *kctl; 176 struct snd_ctl_elem_info *info; 177 int err; 178 179 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; 184 } 185 info = kzalloc(sizeof(*info), GFP_KERNEL); 186 if (info == NULL) { 187 up_read(&card->controls_rwsem); 188 return -ENOMEM; 189 } 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; 196 } 197 kfree(info); 198 return err; 199} 200 201static int get_elem_size(int type, int count) 202{ 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; 214 } 215} 216 217static 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) 221{ 222 int i, type, count, size; 223 unsigned int indirect; 224 225 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; 234 235 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; 242 } 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; 248 } 249 if (copy_from_user(data->value.bytes.data, 250 data32->value.data, size)) 251 return -EFAULT; 252 } 253 254 *typep = type; 255 *countp = count; 256 return 0; 257} 258 259/* restore the value to 32bit */ 260static 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) 263{ 264 int i, size; 265 266 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; 273 } 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; 279 } 280 return 0; 281} 282 283static int snd_ctl_elem_read_user_compat(struct snd_card *card, 284 struct snd_ctl_elem_value32 __user *data32) 285{ 286 struct snd_ctl_elem_value *data; 287 int err, type, count; 288 289 data = kzalloc(sizeof(*data), GFP_KERNEL); 290 if (data == NULL) 291 return -ENOMEM; 292 293 if ((err = copy_ctl_value_from_user(card, data, data32, &type, &count)) < 0) 294 goto error; 295 296 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; 306} 307 308static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file, 309 struct snd_ctl_elem_value32 __user *data32) 310{ 311 struct snd_ctl_elem_value *data; 312 struct snd_card *card = file->card; 313 int err, type, count; 314 315 data = kzalloc(sizeof(*data), GFP_KERNEL); 316 if (data == NULL) 317 return -ENOMEM; 318 319 if ((err = copy_ctl_value_from_user(card, data, data32, &type, &count)) < 0) 320 goto error; 321 322 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; 332} 333 334/* add or replace a user control */ 335static int snd_ctl_elem_add_compat(struct snd_ctl_file *file, 336 struct snd_ctl_elem_info32 __user *data32, 337 int replace) 338{ 339 struct snd_ctl_elem_info *data; 340 int err; 341 342 data = kzalloc(sizeof(*data), GFP_KERNEL); 343 if (! data) 344 return -ENOMEM; 345 346 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; 376 } 377 err = snd_ctl_elem_add(file, data, replace); 378 error: 379 kfree(data); 380 return err; 381} 382 383enum { 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), 390}; 391 392static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg) 393{ 394 struct snd_ctl_file *ctl; 395 struct snd_kctl_ioctl *p; 396 void __user *argp = compat_ptr(arg); 397 int err; 398 399 ctl = file->private_data; 400 snd_assert(ctl && ctl->card, return -ENXIO); 401 402 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); 427 } 428 429 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; 436 } 437 } 438 } 439 up_read(&snd_ioctl_rwsem); 440 return -ENOIOCTLCMD; 441} 442