David Schleef | ed9eccb | 2008-11-04 20:29:31 -0800 | [diff] [blame^] | 1 | /* |
| 2 | comedi/comedi_compat32.c |
| 3 | 32-bit ioctl compatibility for 64-bit comedi kernel module. |
| 4 | |
| 5 | Author: Ian Abbott, MEV Ltd. <abbotti@mev.co.uk> |
| 6 | Copyright (C) 2007 MEV Ltd. <http://www.mev.co.uk/> |
| 7 | |
| 8 | COMEDI - Linux Control and Measurement Device Interface |
| 9 | Copyright (C) 1997-2007 David A. Schleef <ds@schleef.org> |
| 10 | |
| 11 | This program is free software; you can redistribute it and/or modify |
| 12 | it under the terms of the GNU General Public License as published by |
| 13 | the Free Software Foundation; either version 2 of the License, or |
| 14 | (at your option) any later version. |
| 15 | |
| 16 | This program is distributed in the hope that it will be useful, |
| 17 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | GNU General Public License for more details. |
| 20 | |
| 21 | You should have received a copy of the GNU General Public License |
| 22 | along with this program; if not, write to the Free Software |
| 23 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 24 | |
| 25 | */ |
| 26 | |
| 27 | #define __NO_VERSION__ |
| 28 | #include "comedi.h" |
| 29 | #include <linux/smp_lock.h> |
| 30 | #include <asm/uaccess.h> |
| 31 | |
| 32 | #include "comedi_compat32.h" |
| 33 | |
| 34 | #ifdef CONFIG_COMPAT |
| 35 | |
| 36 | #ifndef HAVE_COMPAT_IOCTL |
| 37 | #include <linux/ioctl32.h> /* for (un)register_ioctl32_conversion */ |
| 38 | #endif |
| 39 | |
| 40 | #define COMEDI32_CHANINFO _IOR(CIO,3,comedi32_chaninfo) |
| 41 | #define COMEDI32_RANGEINFO _IOR(CIO,8,comedi32_rangeinfo) |
| 42 | /* N.B. COMEDI32_CMD and COMEDI_CMD ought to use _IOWR, not _IOR. |
| 43 | * It's too late to change it now, but it only affects the command number. */ |
| 44 | #define COMEDI32_CMD _IOR(CIO,9,comedi32_cmd) |
| 45 | /* N.B. COMEDI32_CMDTEST and COMEDI_CMDTEST ought to use _IOWR, not _IOR. |
| 46 | * It's too late to change it now, but it only affects the command number. */ |
| 47 | #define COMEDI32_CMDTEST _IOR(CIO,10,comedi32_cmd) |
| 48 | #define COMEDI32_INSNLIST _IOR(CIO,11,comedi32_insnlist) |
| 49 | #define COMEDI32_INSN _IOR(CIO,12,comedi32_insn) |
| 50 | |
| 51 | typedef struct comedi32_chaninfo_struct { |
| 52 | unsigned int subdev; |
| 53 | compat_uptr_t maxdata_list; /* 32-bit 'lsampl_t *' */ |
| 54 | compat_uptr_t flaglist; /* 32-bit 'unsigned int *' */ |
| 55 | compat_uptr_t rangelist; /* 32-bit 'unsigned int *' */ |
| 56 | unsigned int unused[4]; |
| 57 | } comedi32_chaninfo; |
| 58 | |
| 59 | typedef struct comedi32_rangeinfo_struct { |
| 60 | unsigned int range_type; |
| 61 | compat_uptr_t range_ptr; /* 32-bit 'void *' */ |
| 62 | } comedi32_rangeinfo; |
| 63 | |
| 64 | typedef struct comedi32_cmd_struct { |
| 65 | unsigned int subdev; |
| 66 | unsigned int flags; |
| 67 | unsigned int start_src; |
| 68 | unsigned int start_arg; |
| 69 | unsigned int scan_begin_src; |
| 70 | unsigned int scan_begin_arg; |
| 71 | unsigned int convert_src; |
| 72 | unsigned int convert_arg; |
| 73 | unsigned int scan_end_src; |
| 74 | unsigned int scan_end_arg; |
| 75 | unsigned int stop_src; |
| 76 | unsigned int stop_arg; |
| 77 | compat_uptr_t chanlist; /* 32-bit 'unsigned int *' */ |
| 78 | unsigned int chanlist_len; |
| 79 | compat_uptr_t data; /* 32-bit 'sampl_t *' */ |
| 80 | unsigned int data_len; |
| 81 | } comedi32_cmd; |
| 82 | |
| 83 | typedef struct comedi32_insn_struct { |
| 84 | unsigned int insn; |
| 85 | unsigned int n; |
| 86 | compat_uptr_t data; /* 32-bit 'lsampl_t *' */ |
| 87 | unsigned int subdev; |
| 88 | unsigned int chanspec; |
| 89 | unsigned int unused[3]; |
| 90 | } comedi32_insn; |
| 91 | |
| 92 | typedef struct comedi32_insnlist_struct { |
| 93 | unsigned int n_insns; |
| 94 | compat_uptr_t insns; /* 32-bit 'comedi_insn *' */ |
| 95 | } comedi32_insnlist; |
| 96 | |
| 97 | /* Handle translated ioctl. */ |
| 98 | static int translated_ioctl(struct file *file, unsigned int cmd, |
| 99 | unsigned long arg) |
| 100 | { |
| 101 | if (!file->f_op) { |
| 102 | return -ENOTTY; |
| 103 | } |
| 104 | #ifdef HAVE_UNLOCKED_IOCTL |
| 105 | if (file->f_op->unlocked_ioctl) { |
| 106 | int rc = (int)(*file->f_op->unlocked_ioctl)(file, cmd, arg); |
| 107 | if (rc == -ENOIOCTLCMD) { |
| 108 | rc = -ENOTTY; |
| 109 | } |
| 110 | return rc; |
| 111 | } |
| 112 | #endif |
| 113 | if (file->f_op->ioctl) { |
| 114 | int rc; |
| 115 | lock_kernel(); |
| 116 | rc = (*file->f_op->ioctl)(file->f_dentry->d_inode, |
| 117 | file, cmd, arg); |
| 118 | unlock_kernel(); |
| 119 | return rc; |
| 120 | } |
| 121 | return -ENOTTY; |
| 122 | } |
| 123 | |
| 124 | /* Handle 32-bit COMEDI_CHANINFO ioctl. */ |
| 125 | static int compat_chaninfo(struct file *file, unsigned long arg) |
| 126 | { |
| 127 | comedi_chaninfo __user *chaninfo; |
| 128 | comedi32_chaninfo __user *chaninfo32; |
| 129 | int err; |
| 130 | union { |
| 131 | unsigned int uint; |
| 132 | compat_uptr_t uptr; |
| 133 | } temp; |
| 134 | |
| 135 | chaninfo32 = compat_ptr(arg); |
| 136 | chaninfo = compat_alloc_user_space(sizeof(*chaninfo)); |
| 137 | |
| 138 | /* Copy chaninfo structure. Ignore unused members. */ |
| 139 | if (!access_ok(VERIFY_READ, chaninfo32, sizeof(*chaninfo32)) |
| 140 | || !access_ok(VERIFY_WRITE, chaninfo, |
| 141 | sizeof(*chaninfo))) { |
| 142 | return -EFAULT; |
| 143 | } |
| 144 | err = 0; |
| 145 | err |= __get_user(temp.uint, &chaninfo32->subdev); |
| 146 | err |= __put_user(temp.uint, &chaninfo->subdev); |
| 147 | err |= __get_user(temp.uptr, &chaninfo32->maxdata_list); |
| 148 | err |= __put_user(compat_ptr(temp.uptr), &chaninfo->maxdata_list); |
| 149 | err |= __get_user(temp.uptr, &chaninfo32->flaglist); |
| 150 | err |= __put_user(compat_ptr(temp.uptr), &chaninfo->flaglist); |
| 151 | err |= __get_user(temp.uptr, &chaninfo32->rangelist); |
| 152 | err |= __put_user(compat_ptr(temp.uptr), &chaninfo->rangelist); |
| 153 | if (err) { |
| 154 | return -EFAULT; |
| 155 | } |
| 156 | |
| 157 | return translated_ioctl(file, COMEDI_CHANINFO, (unsigned long)chaninfo); |
| 158 | } |
| 159 | |
| 160 | /* Handle 32-bit COMEDI_RANGEINFO ioctl. */ |
| 161 | static int compat_rangeinfo(struct file *file, unsigned long arg) |
| 162 | { |
| 163 | comedi_rangeinfo __user *rangeinfo; |
| 164 | comedi32_rangeinfo __user *rangeinfo32; |
| 165 | int err; |
| 166 | union { |
| 167 | unsigned int uint; |
| 168 | compat_uptr_t uptr; |
| 169 | } temp; |
| 170 | |
| 171 | rangeinfo32 = compat_ptr(arg); |
| 172 | rangeinfo = compat_alloc_user_space(sizeof(*rangeinfo)); |
| 173 | |
| 174 | /* Copy rangeinfo structure. */ |
| 175 | if (!access_ok(VERIFY_READ, rangeinfo32, sizeof(*rangeinfo32)) |
| 176 | || !access_ok(VERIFY_WRITE, rangeinfo, |
| 177 | sizeof(*rangeinfo))) { |
| 178 | return -EFAULT; |
| 179 | } |
| 180 | err = 0; |
| 181 | err |= __get_user(temp.uint, &rangeinfo32->range_type); |
| 182 | err |= __put_user(temp.uint, &rangeinfo->range_type); |
| 183 | err |= __get_user(temp.uptr, &rangeinfo32->range_ptr); |
| 184 | err |= __put_user(compat_ptr(temp.uptr), &rangeinfo->range_ptr); |
| 185 | if (err) { |
| 186 | return -EFAULT; |
| 187 | } |
| 188 | |
| 189 | return translated_ioctl(file, COMEDI_RANGEINFO, |
| 190 | (unsigned long)rangeinfo); |
| 191 | } |
| 192 | |
| 193 | /* Copy 32-bit cmd structure to native cmd structure. */ |
| 194 | static int get_compat_cmd(comedi_cmd __user *cmd, |
| 195 | comedi32_cmd __user *cmd32) |
| 196 | { |
| 197 | int err; |
| 198 | union { |
| 199 | unsigned int uint; |
| 200 | compat_uptr_t uptr; |
| 201 | } temp; |
| 202 | |
| 203 | /* Copy cmd structure. */ |
| 204 | if (!access_ok(VERIFY_READ, cmd32, sizeof(*cmd32)) |
| 205 | || !access_ok(VERIFY_WRITE, cmd, sizeof(*cmd))) { |
| 206 | return -EFAULT; |
| 207 | } |
| 208 | err = 0; |
| 209 | err |= __get_user(temp.uint, &cmd32->subdev); |
| 210 | err |= __put_user(temp.uint, &cmd->subdev); |
| 211 | err |= __get_user(temp.uint, &cmd32->flags); |
| 212 | err |= __put_user(temp.uint, &cmd->flags); |
| 213 | err |= __get_user(temp.uint, &cmd32->start_src); |
| 214 | err |= __put_user(temp.uint, &cmd->start_src); |
| 215 | err |= __get_user(temp.uint, &cmd32->start_arg); |
| 216 | err |= __put_user(temp.uint, &cmd->start_arg); |
| 217 | err |= __get_user(temp.uint, &cmd32->scan_begin_src); |
| 218 | err |= __put_user(temp.uint, &cmd->scan_begin_src); |
| 219 | err |= __get_user(temp.uint, &cmd32->scan_begin_arg); |
| 220 | err |= __put_user(temp.uint, &cmd->scan_begin_arg); |
| 221 | err |= __get_user(temp.uint, &cmd32->convert_src); |
| 222 | err |= __put_user(temp.uint, &cmd->convert_src); |
| 223 | err |= __get_user(temp.uint, &cmd32->convert_arg); |
| 224 | err |= __put_user(temp.uint, &cmd->convert_arg); |
| 225 | err |= __get_user(temp.uint, &cmd32->scan_end_src); |
| 226 | err |= __put_user(temp.uint, &cmd->scan_end_src); |
| 227 | err |= __get_user(temp.uint, &cmd32->scan_end_arg); |
| 228 | err |= __put_user(temp.uint, &cmd->scan_end_arg); |
| 229 | err |= __get_user(temp.uint, &cmd32->stop_src); |
| 230 | err |= __put_user(temp.uint, &cmd->stop_src); |
| 231 | err |= __get_user(temp.uint, &cmd32->stop_arg); |
| 232 | err |= __put_user(temp.uint, &cmd->stop_arg); |
| 233 | err |= __get_user(temp.uptr, &cmd32->chanlist); |
| 234 | err |= __put_user(compat_ptr(temp.uptr), &cmd->chanlist); |
| 235 | err |= __get_user(temp.uint, &cmd32->chanlist_len); |
| 236 | err |= __put_user(temp.uint, &cmd->chanlist_len); |
| 237 | err |= __get_user(temp.uptr, &cmd32->data); |
| 238 | err |= __put_user(compat_ptr(temp.uptr), &cmd->data); |
| 239 | err |= __get_user(temp.uint, &cmd32->data_len); |
| 240 | err |= __put_user(temp.uint, &cmd->data_len); |
| 241 | return err ? -EFAULT : 0; |
| 242 | } |
| 243 | |
| 244 | /* Copy native cmd structure to 32-bit cmd structure. */ |
| 245 | static int put_compat_cmd(comedi32_cmd __user *cmd32, comedi_cmd __user *cmd) |
| 246 | { |
| 247 | int err; |
| 248 | unsigned int temp; |
| 249 | |
| 250 | /* Copy back most of cmd structure. */ |
| 251 | /* Assume the pointer values are already valid. */ |
| 252 | /* (Could use ptr_to_compat() to set them, but that wasn't implemented |
| 253 | * until kernel version 2.6.11.) */ |
| 254 | if (!access_ok(VERIFY_READ, cmd, sizeof(*cmd)) |
| 255 | || !access_ok(VERIFY_WRITE, cmd32, sizeof(*cmd32))) { |
| 256 | return -EFAULT; |
| 257 | } |
| 258 | err = 0; |
| 259 | err |= __get_user(temp, &cmd->subdev); |
| 260 | err |= __put_user(temp, &cmd32->subdev); |
| 261 | err |= __get_user(temp, &cmd->flags); |
| 262 | err |= __put_user(temp, &cmd32->flags); |
| 263 | err |= __get_user(temp, &cmd->start_src); |
| 264 | err |= __put_user(temp, &cmd32->start_src); |
| 265 | err |= __get_user(temp, &cmd->start_arg); |
| 266 | err |= __put_user(temp, &cmd32->start_arg); |
| 267 | err |= __get_user(temp, &cmd->scan_begin_src); |
| 268 | err |= __put_user(temp, &cmd32->scan_begin_src); |
| 269 | err |= __get_user(temp, &cmd->scan_begin_arg); |
| 270 | err |= __put_user(temp, &cmd32->scan_begin_arg); |
| 271 | err |= __get_user(temp, &cmd->convert_src); |
| 272 | err |= __put_user(temp, &cmd32->convert_src); |
| 273 | err |= __get_user(temp, &cmd->convert_arg); |
| 274 | err |= __put_user(temp, &cmd32->convert_arg); |
| 275 | err |= __get_user(temp, &cmd->scan_end_src); |
| 276 | err |= __put_user(temp, &cmd32->scan_end_src); |
| 277 | err |= __get_user(temp, &cmd->scan_end_arg); |
| 278 | err |= __put_user(temp, &cmd32->scan_end_arg); |
| 279 | err |= __get_user(temp, &cmd->stop_src); |
| 280 | err |= __put_user(temp, &cmd32->stop_src); |
| 281 | err |= __get_user(temp, &cmd->stop_arg); |
| 282 | err |= __put_user(temp, &cmd32->stop_arg); |
| 283 | /* Assume chanlist pointer is unchanged. */ |
| 284 | err |= __get_user(temp, &cmd->chanlist_len); |
| 285 | err |= __put_user(temp, &cmd32->chanlist_len); |
| 286 | /* Assume data pointer is unchanged. */ |
| 287 | err |= __get_user(temp, &cmd->data_len); |
| 288 | err |= __put_user(temp, &cmd32->data_len); |
| 289 | return err ? -EFAULT : 0; |
| 290 | } |
| 291 | |
| 292 | /* Handle 32-bit COMEDI_CMD ioctl. */ |
| 293 | static int compat_cmd(struct file *file, unsigned long arg) |
| 294 | { |
| 295 | comedi_cmd __user *cmd; |
| 296 | comedi32_cmd __user *cmd32; |
| 297 | int rc; |
| 298 | |
| 299 | cmd32 = compat_ptr(arg); |
| 300 | cmd = compat_alloc_user_space(sizeof(*cmd)); |
| 301 | |
| 302 | rc = get_compat_cmd(cmd, cmd32); |
| 303 | if (rc) { |
| 304 | return rc; |
| 305 | } |
| 306 | |
| 307 | return translated_ioctl(file, COMEDI_CMD, (unsigned long)cmd); |
| 308 | } |
| 309 | |
| 310 | /* Handle 32-bit COMEDI_CMDTEST ioctl. */ |
| 311 | static int compat_cmdtest(struct file *file, unsigned long arg) |
| 312 | { |
| 313 | comedi_cmd __user *cmd; |
| 314 | comedi32_cmd __user *cmd32; |
| 315 | int rc, err; |
| 316 | |
| 317 | cmd32 = compat_ptr(arg); |
| 318 | cmd = compat_alloc_user_space(sizeof(*cmd)); |
| 319 | |
| 320 | rc = get_compat_cmd(cmd, cmd32); |
| 321 | if (rc) { |
| 322 | return rc; |
| 323 | } |
| 324 | |
| 325 | rc = translated_ioctl(file, COMEDI_CMDTEST, (unsigned long)cmd); |
| 326 | if (rc < 0) { |
| 327 | return rc; |
| 328 | } |
| 329 | |
| 330 | err = put_compat_cmd(cmd32, cmd); |
| 331 | if (err) { |
| 332 | rc = err; |
| 333 | } |
| 334 | return rc; |
| 335 | } |
| 336 | |
| 337 | /* Copy 32-bit insn structure to native insn structure. */ |
| 338 | static int get_compat_insn(comedi_insn __user *insn, |
| 339 | comedi32_insn __user *insn32) |
| 340 | { |
| 341 | int err; |
| 342 | union { |
| 343 | unsigned int uint; |
| 344 | compat_uptr_t uptr; |
| 345 | } temp; |
| 346 | |
| 347 | /* Copy insn structure. Ignore the unused members. */ |
| 348 | err = 0; |
| 349 | if (!access_ok(VERIFY_READ, insn32, sizeof(*insn32)) |
| 350 | || !access_ok(VERIFY_WRITE, insn, sizeof(*insn))) { |
| 351 | return -EFAULT; |
| 352 | } |
| 353 | err |= __get_user(temp.uint, &insn32->insn); |
| 354 | err |= __put_user(temp.uint, &insn->insn); |
| 355 | err |= __get_user(temp.uint, &insn32->n); |
| 356 | err |= __put_user(temp.uint, &insn->n); |
| 357 | err |= __get_user(temp.uptr, &insn32->data); |
| 358 | err |= __put_user(compat_ptr(temp.uptr), &insn->data); |
| 359 | err |= __get_user(temp.uint, &insn32->subdev); |
| 360 | err |= __put_user(temp.uint, &insn->subdev); |
| 361 | err |= __get_user(temp.uint, &insn32->chanspec); |
| 362 | err |= __put_user(temp.uint, &insn->chanspec); |
| 363 | return err ? -EFAULT : 0; |
| 364 | } |
| 365 | |
| 366 | /* Handle 32-bit COMEDI_INSNLIST ioctl. */ |
| 367 | static int compat_insnlist(struct file *file, unsigned long arg) |
| 368 | { |
| 369 | struct combined_insnlist { |
| 370 | comedi_insnlist insnlist; |
| 371 | comedi_insn insn[1]; |
| 372 | } __user *s; |
| 373 | comedi32_insnlist __user *insnlist32; |
| 374 | comedi32_insn __user *insn32; |
| 375 | compat_uptr_t uptr; |
| 376 | unsigned int n_insns, n; |
| 377 | int err, rc; |
| 378 | |
| 379 | insnlist32 = compat_ptr(arg); |
| 380 | |
| 381 | /* Get 32-bit insnlist structure. */ |
| 382 | if (!access_ok(VERIFY_READ, insnlist32, sizeof(*insnlist32))) { |
| 383 | return -EFAULT; |
| 384 | } |
| 385 | err = 0; |
| 386 | err |= __get_user(n_insns, &insnlist32->n_insns); |
| 387 | err |= __get_user(uptr, &insnlist32->insns); |
| 388 | insn32 = compat_ptr(uptr); |
| 389 | if (err) { |
| 390 | return -EFAULT; |
| 391 | } |
| 392 | |
| 393 | /* Allocate user memory to copy insnlist and insns into. */ |
| 394 | s = compat_alloc_user_space(offsetof(struct combined_insnlist, |
| 395 | insn[n_insns])); |
| 396 | |
| 397 | /* Set native insnlist structure. */ |
| 398 | if (!access_ok(VERIFY_WRITE, &s->insnlist, sizeof(s->insnlist))) { |
| 399 | return -EFAULT; |
| 400 | } |
| 401 | err |= __put_user(n_insns, &s->insnlist.n_insns); |
| 402 | err |= __put_user(&s->insn[0], &s->insnlist.insns); |
| 403 | if (err) { |
| 404 | return -EFAULT; |
| 405 | } |
| 406 | |
| 407 | /* Copy insn structures. */ |
| 408 | for (n = 0; n < n_insns; n++) { |
| 409 | rc = get_compat_insn(&s->insn[n], &insn32[n]); |
| 410 | if (rc) { |
| 411 | return rc; |
| 412 | } |
| 413 | } |
| 414 | |
| 415 | return translated_ioctl(file, COMEDI_INSNLIST, |
| 416 | (unsigned long)&s->insnlist); |
| 417 | } |
| 418 | |
| 419 | /* Handle 32-bit COMEDI_INSN ioctl. */ |
| 420 | static int compat_insn(struct file *file, unsigned long arg) |
| 421 | { |
| 422 | comedi_insn __user *insn; |
| 423 | comedi32_insn __user *insn32; |
| 424 | int rc; |
| 425 | |
| 426 | insn32 = compat_ptr(arg); |
| 427 | insn = compat_alloc_user_space(sizeof(*insn)); |
| 428 | |
| 429 | rc = get_compat_insn(insn, insn32); |
| 430 | if (rc) { |
| 431 | return rc; |
| 432 | } |
| 433 | |
| 434 | return translated_ioctl(file, COMEDI_INSN, (unsigned long)insn); |
| 435 | } |
| 436 | |
| 437 | /* Process untranslated ioctl. */ |
| 438 | /* Returns -ENOIOCTLCMD for unrecognised ioctl codes. */ |
| 439 | static inline int raw_ioctl(struct file *file, unsigned int cmd, |
| 440 | unsigned long arg) |
| 441 | { |
| 442 | int rc; |
| 443 | |
| 444 | switch (cmd) { |
| 445 | case COMEDI_DEVCONFIG: |
| 446 | case COMEDI_DEVINFO: |
| 447 | case COMEDI_SUBDINFO: |
| 448 | case COMEDI_BUFCONFIG: |
| 449 | case COMEDI_BUFINFO: |
| 450 | /* Just need to translate the pointer argument. */ |
| 451 | arg = (unsigned long)compat_ptr(arg); |
| 452 | rc = translated_ioctl(file, cmd, arg); |
| 453 | break; |
| 454 | case COMEDI_LOCK: |
| 455 | case COMEDI_UNLOCK: |
| 456 | case COMEDI_CANCEL: |
| 457 | case COMEDI_POLL: |
| 458 | /* No translation needed. */ |
| 459 | rc = translated_ioctl(file, cmd, arg); |
| 460 | break; |
| 461 | case COMEDI32_CHANINFO: |
| 462 | rc = compat_chaninfo(file, arg); |
| 463 | break; |
| 464 | case COMEDI32_RANGEINFO: |
| 465 | rc = compat_rangeinfo(file, arg); |
| 466 | break; |
| 467 | case COMEDI32_CMD: |
| 468 | rc = compat_cmd(file, arg); |
| 469 | break; |
| 470 | case COMEDI32_CMDTEST: |
| 471 | rc = compat_cmdtest(file, arg); |
| 472 | break; |
| 473 | case COMEDI32_INSNLIST: |
| 474 | rc = compat_insnlist(file, arg); |
| 475 | break; |
| 476 | case COMEDI32_INSN: |
| 477 | rc = compat_insn(file, arg); |
| 478 | break; |
| 479 | default: |
| 480 | rc = -ENOIOCTLCMD; |
| 481 | break; |
| 482 | } |
| 483 | return rc; |
| 484 | } |
| 485 | |
| 486 | #ifdef HAVE_COMPAT_IOCTL /* defined in <linux/fs.h> 2.6.11 onwards */ |
| 487 | |
| 488 | /* compat_ioctl file operation. */ |
| 489 | /* Returns -ENOIOCTLCMD for unrecognised ioctl codes. */ |
| 490 | long comedi_compat_ioctl(struct file *file, unsigned int cmd, |
| 491 | unsigned long arg) |
| 492 | { |
| 493 | return raw_ioctl(file, cmd, arg); |
| 494 | } |
| 495 | |
| 496 | #else /* HAVE_COMPAT_IOCTL */ |
| 497 | |
| 498 | /* |
| 499 | * Brain-dead ioctl compatibility for 2.6.10 and earlier. |
| 500 | * |
| 501 | * It's brain-dead because cmd numbers need to be unique system-wide! |
| 502 | * The comedi driver could end up attempting to execute ioctls for non-Comedi |
| 503 | * devices because it registered the system-wide cmd code first. Similarly, |
| 504 | * another driver could end up attempting to execute ioctls for a Comedi |
| 505 | * device because it registered the cmd code first. Chaos ensues. |
| 506 | */ |
| 507 | |
| 508 | /* Handler for all 32-bit ioctl codes registered by this driver. */ |
| 509 | static int mapped_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg, |
| 510 | struct file *file) |
| 511 | { |
| 512 | int rc; |
| 513 | |
| 514 | /* Make sure we are dealing with a Comedi device. */ |
| 515 | if (imajor(file->f_dentry->d_inode) != COMEDI_MAJOR) { |
| 516 | return -ENOTTY; |
| 517 | } |
| 518 | rc = raw_ioctl(file, cmd, arg); |
| 519 | /* Do not return -ENOIOCTLCMD. */ |
| 520 | if (rc == -ENOIOCTLCMD) { |
| 521 | rc = -ENOTTY; |
| 522 | } |
| 523 | return rc; |
| 524 | } |
| 525 | |
| 526 | struct ioctl32_map { |
| 527 | unsigned int cmd; |
| 528 | int (*handler)(unsigned int, unsigned int, unsigned long, |
| 529 | struct file *); |
| 530 | int registered; |
| 531 | }; |
| 532 | |
| 533 | static struct ioctl32_map comedi_ioctl32_map[] = { |
| 534 | { COMEDI_DEVCONFIG, mapped_ioctl, 0 }, |
| 535 | { COMEDI_DEVINFO, mapped_ioctl, 0 }, |
| 536 | { COMEDI_SUBDINFO, mapped_ioctl, 0 }, |
| 537 | { COMEDI_BUFCONFIG, mapped_ioctl, 0 }, |
| 538 | { COMEDI_BUFINFO, mapped_ioctl, 0 }, |
| 539 | { COMEDI_LOCK, mapped_ioctl, 0 }, |
| 540 | { COMEDI_UNLOCK, mapped_ioctl, 0 }, |
| 541 | { COMEDI_CANCEL, mapped_ioctl, 0 }, |
| 542 | { COMEDI_POLL, mapped_ioctl, 0 }, |
| 543 | { COMEDI32_CHANINFO, mapped_ioctl, 0 }, |
| 544 | { COMEDI32_RANGEINFO, mapped_ioctl, 0 }, |
| 545 | { COMEDI32_CMD, mapped_ioctl, 0 }, |
| 546 | { COMEDI32_CMDTEST, mapped_ioctl, 0 }, |
| 547 | { COMEDI32_INSNLIST, mapped_ioctl, 0 }, |
| 548 | { COMEDI32_INSN, mapped_ioctl, 0 }, |
| 549 | }; |
| 550 | |
| 551 | #define NUM_IOCTL32_MAPS ARRAY_SIZE(comedi_ioctl32_map) |
| 552 | |
| 553 | /* Register system-wide 32-bit ioctl handlers. */ |
| 554 | void comedi_register_ioctl32(void) |
| 555 | { |
| 556 | int n, rc; |
| 557 | |
| 558 | for (n = 0; n < NUM_IOCTL32_MAPS; n++) { |
| 559 | rc = register_ioctl32_conversion(comedi_ioctl32_map[n].cmd, |
| 560 | comedi_ioctl32_map[n].handler); |
| 561 | if (rc) { |
| 562 | printk(KERN_WARNING |
| 563 | "comedi: failed to register 32-bit " |
| 564 | "compatible ioctl handler for 0x%X - " |
| 565 | "expect bad things to happen!\n", |
| 566 | comedi_ioctl32_map[n].cmd); |
| 567 | } |
| 568 | comedi_ioctl32_map[n].registered = !rc; |
| 569 | } |
| 570 | } |
| 571 | |
| 572 | /* Unregister system-wide 32-bit ioctl translations. */ |
| 573 | void comedi_unregister_ioctl32(void) |
| 574 | { |
| 575 | int n, rc; |
| 576 | |
| 577 | for (n = 0; n < NUM_IOCTL32_MAPS; n++) { |
| 578 | if (comedi_ioctl32_map[n].registered) { |
| 579 | rc = unregister_ioctl32_conversion( |
| 580 | comedi_ioctl32_map[n].cmd, |
| 581 | comedi_ioctl32_map[n].handler); |
| 582 | if (rc) { |
| 583 | printk(KERN_ERR |
| 584 | "comedi: failed to unregister 32-bit " |
| 585 | "compatible ioctl handler for 0x%X - " |
| 586 | "expect kernel Oops!\n", |
| 587 | comedi_ioctl32_map[n].cmd); |
| 588 | } else { |
| 589 | comedi_ioctl32_map[n].registered = 0; |
| 590 | } |
| 591 | } |
| 592 | } |
| 593 | } |
| 594 | |
| 595 | #endif /* HAVE_COMPAT_IOCTL */ |
| 596 | |
| 597 | #endif /* CONFIG_COMPAT */ |