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 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 */; 33 34 static 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 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)); 90 91 static 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 */ 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]; 168 }; 169 170 171 /* 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) 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 } 200 201 static 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 } 216 217 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) 221 { 222 int i, type, size; 223 int uninitialized_var(count); 224 unsigned int indirect; 225 226 if (copy_from_user(&data->id, &data32->id, sizeof(data->id))) 227 return -EFAULT; 228 if (get_user(indirect, &data32->indirect)) 229 return -EFAULT; 230 if (indirect) 231 return -EINVAL; 232 type = get_ctl_type(card, &data->id, &count); 233 if (type < 0) 234 return type; 235 236 if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN || 237 type == SNDRV_CTL_ELEM_TYPE_INTEGER) { 238 for (i = 0; i < count; i++) { 239 int val; 240 if (get_user(val, &data32->value.integer[i])) 241 return -EFAULT; 242 data->value.integer.value[i] = val; 243 } 244 } else { 245 size = get_elem_size(type, count); 246 if (size < 0) { 247 printk(KERN_ERR "snd_ioctl32_ctl_elem_value: unknown type %d\n", type); 248 return -EINVAL; 249 } 250 if (copy_from_user(data->value.bytes.data, 251 data32->value.data, size)) 252 return -EFAULT; 253 } 254 255 *typep = type; 256 *countp = count; 257 return 0; 258 } 259 260 /* restore the value to 32bit */ 261 static int copy_ctl_value_to_user(struct snd_ctl_elem_value32 __user *data32, 262 struct snd_ctl_elem_value *data, 263 int type, int count) 264 { 265 int i, size; 266 267 if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN || 268 type == SNDRV_CTL_ELEM_TYPE_INTEGER) { 269 for (i = 0; i < count; i++) { 270 int val; 271 val = data->value.integer.value[i]; 272 if (put_user(val, &data32->value.integer[i])) 273 return -EFAULT; 274 } 275 } else { 276 size = get_elem_size(type, count); 277 if (copy_to_user(data32->value.data, 278 data->value.bytes.data, size)) 279 return -EFAULT; 280 } 281 return 0; 282 } 283 284 static int snd_ctl_elem_read_user_compat(struct snd_card *card, 285 struct snd_ctl_elem_value32 __user *data32) 286 { 287 struct snd_ctl_elem_value *data; 288 int err, type, count; 289 290 data = kzalloc(sizeof(*data), GFP_KERNEL); 291 if (data == NULL) 292 return -ENOMEM; 293 294 if ((err = copy_ctl_value_from_user(card, data, data32, &type, &count)) < 0) 295 goto error; 296 297 snd_power_lock(card); 298 err = snd_power_wait(card, SNDRV_CTL_POWER_D0); 299 if (err >= 0) 300 err = snd_ctl_elem_read(card, data); 301 snd_power_unlock(card); 302 if (err >= 0) 303 err = copy_ctl_value_to_user(data32, data, type, count); 304 error: 305 kfree(data); 306 return err; 307 } 308 309 static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file, 310 struct snd_ctl_elem_value32 __user *data32) 311 { 312 struct snd_ctl_elem_value *data; 313 struct snd_card *card = file->card; 314 int err, type, count; 315 316 data = kzalloc(sizeof(*data), GFP_KERNEL); 317 if (data == NULL) 318 return -ENOMEM; 319 320 if ((err = copy_ctl_value_from_user(card, data, data32, &type, &count)) < 0) 321 goto error; 322 323 snd_power_lock(card); 324 err = snd_power_wait(card, SNDRV_CTL_POWER_D0); 325 if (err >= 0) 326 err = snd_ctl_elem_write(card, file, data); 327 snd_power_unlock(card); 328 if (err >= 0) 329 err = copy_ctl_value_to_user(data32, data, type, count); 330 error: 331 kfree(data); 332 return err; 333 } 334 335 /* add or replace a user control */ 336 static int snd_ctl_elem_add_compat(struct snd_ctl_file *file, 337 struct snd_ctl_elem_info32 __user *data32, 338 int replace) 339 { 340 struct snd_ctl_elem_info *data; 341 int err; 342 343 data = kzalloc(sizeof(*data), GFP_KERNEL); 344 if (! data) 345 return -ENOMEM; 346 347 err = -EFAULT; 348 /* id, type, access, count */ \ 349 if (copy_from_user(&data->id, &data32->id, sizeof(data->id)) || 350 copy_from_user(&data->type, &data32->type, 3 * sizeof(u32))) 351 goto error; 352 if (get_user(data->owner, &data32->owner) || 353 get_user(data->type, &data32->type)) 354 goto error; 355 switch (data->type) { 356 case SNDRV_CTL_ELEM_TYPE_BOOLEAN: 357 case SNDRV_CTL_ELEM_TYPE_INTEGER: 358 if (get_user(data->value.integer.min, &data32->value.integer.min) || 359 get_user(data->value.integer.max, &data32->value.integer.max) || 360 get_user(data->value.integer.step, &data32->value.integer.step)) 361 goto error; 362 break; 363 case SNDRV_CTL_ELEM_TYPE_INTEGER64: 364 if (copy_from_user(&data->value.integer64, 365 &data32->value.integer64, 366 sizeof(data->value.integer64))) 367 goto error; 368 break; 369 case SNDRV_CTL_ELEM_TYPE_ENUMERATED: 370 if (copy_from_user(&data->value.enumerated, 371 &data32->value.enumerated, 372 sizeof(data->value.enumerated))) 373 goto error; 374 break; 375 default: 376 break; 377 } 378 err = snd_ctl_elem_add(file, data, replace); 379 error: 380 kfree(data); 381 return err; 382 } 383 384 enum { 385 SNDRV_CTL_IOCTL_ELEM_LIST32 = _IOWR('U', 0x10, struct snd_ctl_elem_list32), 386 SNDRV_CTL_IOCTL_ELEM_INFO32 = _IOWR('U', 0x11, struct snd_ctl_elem_info32), 387 SNDRV_CTL_IOCTL_ELEM_READ32 = _IOWR('U', 0x12, struct snd_ctl_elem_value32), 388 SNDRV_CTL_IOCTL_ELEM_WRITE32 = _IOWR('U', 0x13, struct snd_ctl_elem_value32), 389 SNDRV_CTL_IOCTL_ELEM_ADD32 = _IOWR('U', 0x17, struct snd_ctl_elem_info32), 390 SNDRV_CTL_IOCTL_ELEM_REPLACE32 = _IOWR('U', 0x18, struct snd_ctl_elem_info32), 391 }; 392 393 static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg) 394 { 395 struct snd_ctl_file *ctl; 396 struct snd_kctl_ioctl *p; 397 void __user *argp = compat_ptr(arg); 398 int err; 399 400 ctl = file->private_data; 401 if (snd_BUG_ON(!ctl || !ctl->card)) 402 return -ENXIO; 403 404 switch (cmd) { 405 case SNDRV_CTL_IOCTL_PVERSION: 406 case SNDRV_CTL_IOCTL_CARD_INFO: 407 case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS: 408 case SNDRV_CTL_IOCTL_POWER: 409 case SNDRV_CTL_IOCTL_POWER_STATE: 410 case SNDRV_CTL_IOCTL_ELEM_LOCK: 411 case SNDRV_CTL_IOCTL_ELEM_UNLOCK: 412 case SNDRV_CTL_IOCTL_ELEM_REMOVE: 413 case SNDRV_CTL_IOCTL_TLV_READ: 414 case SNDRV_CTL_IOCTL_TLV_WRITE: 415 case SNDRV_CTL_IOCTL_TLV_COMMAND: 416 return snd_ctl_ioctl(file, cmd, (unsigned long)argp); 417 case SNDRV_CTL_IOCTL_ELEM_LIST32: 418 return snd_ctl_elem_list_compat(ctl->card, argp); 419 case SNDRV_CTL_IOCTL_ELEM_INFO32: 420 return snd_ctl_elem_info_compat(ctl, argp); 421 case SNDRV_CTL_IOCTL_ELEM_READ32: 422 return snd_ctl_elem_read_user_compat(ctl->card, argp); 423 case SNDRV_CTL_IOCTL_ELEM_WRITE32: 424 return snd_ctl_elem_write_user_compat(ctl, argp); 425 case SNDRV_CTL_IOCTL_ELEM_ADD32: 426 return snd_ctl_elem_add_compat(ctl, argp, 0); 427 case SNDRV_CTL_IOCTL_ELEM_REPLACE32: 428 return snd_ctl_elem_add_compat(ctl, argp, 1); 429 } 430 431 down_read(&snd_ioctl_rwsem); 432 list_for_each_entry(p, &snd_control_compat_ioctls, list) { 433 if (p->fioctl) { 434 err = p->fioctl(ctl->card, ctl, cmd, arg); 435 if (err != -ENOIOCTLCMD) { 436 up_read(&snd_ioctl_rwsem); 437 return err; 438 } 439 } 440 } 441 up_read(&snd_ioctl_rwsem); 442 return -ENOIOCTLCMD; 443 } 444