Commit | Line | Data |
---|---|---|
ed9eccbe DS |
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 | ||
01914923 GKH |
40 | #define COMEDI32_CHANINFO _IOR(CIO, 3, struct comedi32_chaninfo_struct) |
41 | #define COMEDI32_RANGEINFO _IOR(CIO, 8, struct comedi32_rangeinfo_struct) | |
ed9eccbe DS |
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. */ | |
01914923 | 44 | #define COMEDI32_CMD _IOR(CIO, 9, struct comedi32_cmd_struct) |
ed9eccbe DS |
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. */ | |
01914923 GKH |
47 | #define COMEDI32_CMDTEST _IOR(CIO, 10, struct comedi32_cmd_struct) |
48 | #define COMEDI32_INSNLIST _IOR(CIO, 11, struct comedi32_insnlist_struct) | |
49 | #define COMEDI32_INSN _IOR(CIO, 12, struct comedi32_insn_struct) | |
ed9eccbe | 50 | |
bf8db92e | 51 | struct comedi32_chaninfo_struct { |
ed9eccbe | 52 | unsigned int subdev; |
790c5541 | 53 | compat_uptr_t maxdata_list; /* 32-bit 'unsigned int *' */ |
0a85b6f0 | 54 | compat_uptr_t flaglist; /* 32-bit 'unsigned int *' */ |
ed9eccbe DS |
55 | compat_uptr_t rangelist; /* 32-bit 'unsigned int *' */ |
56 | unsigned int unused[4]; | |
bf8db92e | 57 | }; |
ed9eccbe | 58 | |
bf8db92e | 59 | struct comedi32_rangeinfo_struct { |
ed9eccbe DS |
60 | unsigned int range_type; |
61 | compat_uptr_t range_ptr; /* 32-bit 'void *' */ | |
bf8db92e | 62 | }; |
ed9eccbe | 63 | |
bf8db92e | 64 | struct comedi32_cmd_struct { |
ed9eccbe DS |
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; | |
0a85b6f0 | 77 | compat_uptr_t chanlist; /* 32-bit 'unsigned int *' */ |
ed9eccbe | 78 | unsigned int chanlist_len; |
0a85b6f0 | 79 | compat_uptr_t data; /* 32-bit 'short *' */ |
ed9eccbe | 80 | unsigned int data_len; |
bf8db92e | 81 | }; |
ed9eccbe | 82 | |
bf8db92e | 83 | struct comedi32_insn_struct { |
ed9eccbe DS |
84 | unsigned int insn; |
85 | unsigned int n; | |
0a85b6f0 | 86 | compat_uptr_t data; /* 32-bit 'unsigned int *' */ |
ed9eccbe DS |
87 | unsigned int subdev; |
88 | unsigned int chanspec; | |
89 | unsigned int unused[3]; | |
bf8db92e | 90 | }; |
ed9eccbe | 91 | |
bf8db92e | 92 | struct comedi32_insnlist_struct { |
ed9eccbe | 93 | unsigned int n_insns; |
0a85b6f0 | 94 | compat_uptr_t insns; /* 32-bit 'struct comedi_insn *' */ |
bf8db92e | 95 | }; |
ed9eccbe DS |
96 | |
97 | /* Handle translated ioctl. */ | |
98 | static int translated_ioctl(struct file *file, unsigned int cmd, | |
0a85b6f0 | 99 | unsigned long arg) |
ed9eccbe | 100 | { |
82675f35 | 101 | if (!file->f_op) |
ed9eccbe | 102 | return -ENOTTY; |
82675f35 | 103 | |
ed9eccbe DS |
104 | #ifdef HAVE_UNLOCKED_IOCTL |
105 | if (file->f_op->unlocked_ioctl) { | |
0a85b6f0 | 106 | int rc = (int)(*file->f_op->unlocked_ioctl) (file, cmd, arg); |
82675f35 | 107 | if (rc == -ENOIOCTLCMD) |
ed9eccbe | 108 | rc = -ENOTTY; |
ed9eccbe DS |
109 | return rc; |
110 | } | |
111 | #endif | |
112 | if (file->f_op->ioctl) { | |
113 | int rc; | |
114 | lock_kernel(); | |
0a85b6f0 MT |
115 | rc = (*file->f_op->ioctl) (file->f_dentry->d_inode, |
116 | file, cmd, arg); | |
ed9eccbe DS |
117 | unlock_kernel(); |
118 | return rc; | |
119 | } | |
120 | return -ENOTTY; | |
121 | } | |
122 | ||
123 | /* Handle 32-bit COMEDI_CHANINFO ioctl. */ | |
124 | static int compat_chaninfo(struct file *file, unsigned long arg) | |
125 | { | |
01914923 | 126 | struct comedi_chaninfo __user *chaninfo; |
bf8db92e | 127 | struct comedi32_chaninfo_struct __user *chaninfo32; |
ed9eccbe DS |
128 | int err; |
129 | union { | |
130 | unsigned int uint; | |
131 | compat_uptr_t uptr; | |
132 | } temp; | |
133 | ||
134 | chaninfo32 = compat_ptr(arg); | |
135 | chaninfo = compat_alloc_user_space(sizeof(*chaninfo)); | |
136 | ||
137 | /* Copy chaninfo structure. Ignore unused members. */ | |
138 | if (!access_ok(VERIFY_READ, chaninfo32, sizeof(*chaninfo32)) | |
0a85b6f0 | 139 | || !access_ok(VERIFY_WRITE, chaninfo, sizeof(*chaninfo))) { |
ed9eccbe DS |
140 | return -EFAULT; |
141 | } | |
142 | err = 0; | |
143 | err |= __get_user(temp.uint, &chaninfo32->subdev); | |
144 | err |= __put_user(temp.uint, &chaninfo->subdev); | |
145 | err |= __get_user(temp.uptr, &chaninfo32->maxdata_list); | |
146 | err |= __put_user(compat_ptr(temp.uptr), &chaninfo->maxdata_list); | |
147 | err |= __get_user(temp.uptr, &chaninfo32->flaglist); | |
148 | err |= __put_user(compat_ptr(temp.uptr), &chaninfo->flaglist); | |
149 | err |= __get_user(temp.uptr, &chaninfo32->rangelist); | |
150 | err |= __put_user(compat_ptr(temp.uptr), &chaninfo->rangelist); | |
82675f35 | 151 | if (err) |
ed9eccbe | 152 | return -EFAULT; |
ed9eccbe DS |
153 | |
154 | return translated_ioctl(file, COMEDI_CHANINFO, (unsigned long)chaninfo); | |
155 | } | |
156 | ||
157 | /* Handle 32-bit COMEDI_RANGEINFO ioctl. */ | |
158 | static int compat_rangeinfo(struct file *file, unsigned long arg) | |
159 | { | |
d0a353f6 | 160 | struct comedi_rangeinfo __user *rangeinfo; |
bf8db92e | 161 | struct comedi32_rangeinfo_struct __user *rangeinfo32; |
ed9eccbe DS |
162 | int err; |
163 | union { | |
164 | unsigned int uint; | |
165 | compat_uptr_t uptr; | |
166 | } temp; | |
167 | ||
168 | rangeinfo32 = compat_ptr(arg); | |
169 | rangeinfo = compat_alloc_user_space(sizeof(*rangeinfo)); | |
170 | ||
171 | /* Copy rangeinfo structure. */ | |
172 | if (!access_ok(VERIFY_READ, rangeinfo32, sizeof(*rangeinfo32)) | |
0a85b6f0 | 173 | || !access_ok(VERIFY_WRITE, rangeinfo, sizeof(*rangeinfo))) { |
ed9eccbe DS |
174 | return -EFAULT; |
175 | } | |
176 | err = 0; | |
177 | err |= __get_user(temp.uint, &rangeinfo32->range_type); | |
178 | err |= __put_user(temp.uint, &rangeinfo->range_type); | |
179 | err |= __get_user(temp.uptr, &rangeinfo32->range_ptr); | |
180 | err |= __put_user(compat_ptr(temp.uptr), &rangeinfo->range_ptr); | |
82675f35 | 181 | if (err) |
ed9eccbe | 182 | return -EFAULT; |
ed9eccbe DS |
183 | |
184 | return translated_ioctl(file, COMEDI_RANGEINFO, | |
0a85b6f0 | 185 | (unsigned long)rangeinfo); |
ed9eccbe DS |
186 | } |
187 | ||
188 | /* Copy 32-bit cmd structure to native cmd structure. */ | |
0a85b6f0 MT |
189 | static int get_compat_cmd(struct comedi_cmd __user * cmd, |
190 | struct comedi32_cmd_struct __user * cmd32) | |
ed9eccbe DS |
191 | { |
192 | int err; | |
193 | union { | |
194 | unsigned int uint; | |
195 | compat_uptr_t uptr; | |
196 | } temp; | |
197 | ||
198 | /* Copy cmd structure. */ | |
199 | if (!access_ok(VERIFY_READ, cmd32, sizeof(*cmd32)) | |
0a85b6f0 | 200 | || !access_ok(VERIFY_WRITE, cmd, sizeof(*cmd))) { |
ed9eccbe DS |
201 | return -EFAULT; |
202 | } | |
203 | err = 0; | |
204 | err |= __get_user(temp.uint, &cmd32->subdev); | |
205 | err |= __put_user(temp.uint, &cmd->subdev); | |
206 | err |= __get_user(temp.uint, &cmd32->flags); | |
207 | err |= __put_user(temp.uint, &cmd->flags); | |
208 | err |= __get_user(temp.uint, &cmd32->start_src); | |
209 | err |= __put_user(temp.uint, &cmd->start_src); | |
210 | err |= __get_user(temp.uint, &cmd32->start_arg); | |
211 | err |= __put_user(temp.uint, &cmd->start_arg); | |
212 | err |= __get_user(temp.uint, &cmd32->scan_begin_src); | |
213 | err |= __put_user(temp.uint, &cmd->scan_begin_src); | |
214 | err |= __get_user(temp.uint, &cmd32->scan_begin_arg); | |
215 | err |= __put_user(temp.uint, &cmd->scan_begin_arg); | |
216 | err |= __get_user(temp.uint, &cmd32->convert_src); | |
217 | err |= __put_user(temp.uint, &cmd->convert_src); | |
218 | err |= __get_user(temp.uint, &cmd32->convert_arg); | |
219 | err |= __put_user(temp.uint, &cmd->convert_arg); | |
220 | err |= __get_user(temp.uint, &cmd32->scan_end_src); | |
221 | err |= __put_user(temp.uint, &cmd->scan_end_src); | |
222 | err |= __get_user(temp.uint, &cmd32->scan_end_arg); | |
223 | err |= __put_user(temp.uint, &cmd->scan_end_arg); | |
224 | err |= __get_user(temp.uint, &cmd32->stop_src); | |
225 | err |= __put_user(temp.uint, &cmd->stop_src); | |
226 | err |= __get_user(temp.uint, &cmd32->stop_arg); | |
227 | err |= __put_user(temp.uint, &cmd->stop_arg); | |
228 | err |= __get_user(temp.uptr, &cmd32->chanlist); | |
229 | err |= __put_user(compat_ptr(temp.uptr), &cmd->chanlist); | |
230 | err |= __get_user(temp.uint, &cmd32->chanlist_len); | |
231 | err |= __put_user(temp.uint, &cmd->chanlist_len); | |
232 | err |= __get_user(temp.uptr, &cmd32->data); | |
233 | err |= __put_user(compat_ptr(temp.uptr), &cmd->data); | |
234 | err |= __get_user(temp.uint, &cmd32->data_len); | |
235 | err |= __put_user(temp.uint, &cmd->data_len); | |
236 | return err ? -EFAULT : 0; | |
237 | } | |
238 | ||
239 | /* Copy native cmd structure to 32-bit cmd structure. */ | |
0a85b6f0 MT |
240 | static int put_compat_cmd(struct comedi32_cmd_struct __user * cmd32, |
241 | struct comedi_cmd __user * cmd) | |
ed9eccbe DS |
242 | { |
243 | int err; | |
244 | unsigned int temp; | |
245 | ||
246 | /* Copy back most of cmd structure. */ | |
247 | /* Assume the pointer values are already valid. */ | |
248 | /* (Could use ptr_to_compat() to set them, but that wasn't implemented | |
249 | * until kernel version 2.6.11.) */ | |
250 | if (!access_ok(VERIFY_READ, cmd, sizeof(*cmd)) | |
0a85b6f0 | 251 | || !access_ok(VERIFY_WRITE, cmd32, sizeof(*cmd32))) { |
ed9eccbe DS |
252 | return -EFAULT; |
253 | } | |
254 | err = 0; | |
255 | err |= __get_user(temp, &cmd->subdev); | |
256 | err |= __put_user(temp, &cmd32->subdev); | |
257 | err |= __get_user(temp, &cmd->flags); | |
258 | err |= __put_user(temp, &cmd32->flags); | |
259 | err |= __get_user(temp, &cmd->start_src); | |
260 | err |= __put_user(temp, &cmd32->start_src); | |
261 | err |= __get_user(temp, &cmd->start_arg); | |
262 | err |= __put_user(temp, &cmd32->start_arg); | |
263 | err |= __get_user(temp, &cmd->scan_begin_src); | |
264 | err |= __put_user(temp, &cmd32->scan_begin_src); | |
265 | err |= __get_user(temp, &cmd->scan_begin_arg); | |
266 | err |= __put_user(temp, &cmd32->scan_begin_arg); | |
267 | err |= __get_user(temp, &cmd->convert_src); | |
268 | err |= __put_user(temp, &cmd32->convert_src); | |
269 | err |= __get_user(temp, &cmd->convert_arg); | |
270 | err |= __put_user(temp, &cmd32->convert_arg); | |
271 | err |= __get_user(temp, &cmd->scan_end_src); | |
272 | err |= __put_user(temp, &cmd32->scan_end_src); | |
273 | err |= __get_user(temp, &cmd->scan_end_arg); | |
274 | err |= __put_user(temp, &cmd32->scan_end_arg); | |
275 | err |= __get_user(temp, &cmd->stop_src); | |
276 | err |= __put_user(temp, &cmd32->stop_src); | |
277 | err |= __get_user(temp, &cmd->stop_arg); | |
278 | err |= __put_user(temp, &cmd32->stop_arg); | |
279 | /* Assume chanlist pointer is unchanged. */ | |
280 | err |= __get_user(temp, &cmd->chanlist_len); | |
281 | err |= __put_user(temp, &cmd32->chanlist_len); | |
282 | /* Assume data pointer is unchanged. */ | |
283 | err |= __get_user(temp, &cmd->data_len); | |
284 | err |= __put_user(temp, &cmd32->data_len); | |
285 | return err ? -EFAULT : 0; | |
286 | } | |
287 | ||
288 | /* Handle 32-bit COMEDI_CMD ioctl. */ | |
289 | static int compat_cmd(struct file *file, unsigned long arg) | |
290 | { | |
ea6d0d4c | 291 | struct comedi_cmd __user *cmd; |
bf8db92e | 292 | struct comedi32_cmd_struct __user *cmd32; |
ed9eccbe DS |
293 | int rc; |
294 | ||
295 | cmd32 = compat_ptr(arg); | |
296 | cmd = compat_alloc_user_space(sizeof(*cmd)); | |
297 | ||
298 | rc = get_compat_cmd(cmd, cmd32); | |
82675f35 | 299 | if (rc) |
ed9eccbe | 300 | return rc; |
ed9eccbe DS |
301 | |
302 | return translated_ioctl(file, COMEDI_CMD, (unsigned long)cmd); | |
303 | } | |
304 | ||
305 | /* Handle 32-bit COMEDI_CMDTEST ioctl. */ | |
306 | static int compat_cmdtest(struct file *file, unsigned long arg) | |
307 | { | |
ea6d0d4c | 308 | struct comedi_cmd __user *cmd; |
bf8db92e | 309 | struct comedi32_cmd_struct __user *cmd32; |
ed9eccbe DS |
310 | int rc, err; |
311 | ||
312 | cmd32 = compat_ptr(arg); | |
313 | cmd = compat_alloc_user_space(sizeof(*cmd)); | |
314 | ||
315 | rc = get_compat_cmd(cmd, cmd32); | |
82675f35 | 316 | if (rc) |
ed9eccbe | 317 | return rc; |
ed9eccbe DS |
318 | |
319 | rc = translated_ioctl(file, COMEDI_CMDTEST, (unsigned long)cmd); | |
82675f35 | 320 | if (rc < 0) |
ed9eccbe | 321 | return rc; |
ed9eccbe DS |
322 | |
323 | err = put_compat_cmd(cmd32, cmd); | |
82675f35 | 324 | if (err) |
ed9eccbe | 325 | rc = err; |
82675f35 | 326 | |
ed9eccbe DS |
327 | return rc; |
328 | } | |
329 | ||
330 | /* Copy 32-bit insn structure to native insn structure. */ | |
0a85b6f0 MT |
331 | static int get_compat_insn(struct comedi_insn __user * insn, |
332 | struct comedi32_insn_struct __user * insn32) | |
ed9eccbe DS |
333 | { |
334 | int err; | |
335 | union { | |
336 | unsigned int uint; | |
337 | compat_uptr_t uptr; | |
338 | } temp; | |
339 | ||
340 | /* Copy insn structure. Ignore the unused members. */ | |
341 | err = 0; | |
342 | if (!access_ok(VERIFY_READ, insn32, sizeof(*insn32)) | |
0a85b6f0 | 343 | || !access_ok(VERIFY_WRITE, insn, sizeof(*insn))) |
ed9eccbe | 344 | return -EFAULT; |
82675f35 | 345 | |
ed9eccbe DS |
346 | err |= __get_user(temp.uint, &insn32->insn); |
347 | err |= __put_user(temp.uint, &insn->insn); | |
348 | err |= __get_user(temp.uint, &insn32->n); | |
349 | err |= __put_user(temp.uint, &insn->n); | |
350 | err |= __get_user(temp.uptr, &insn32->data); | |
351 | err |= __put_user(compat_ptr(temp.uptr), &insn->data); | |
352 | err |= __get_user(temp.uint, &insn32->subdev); | |
353 | err |= __put_user(temp.uint, &insn->subdev); | |
354 | err |= __get_user(temp.uint, &insn32->chanspec); | |
355 | err |= __put_user(temp.uint, &insn->chanspec); | |
356 | return err ? -EFAULT : 0; | |
357 | } | |
358 | ||
359 | /* Handle 32-bit COMEDI_INSNLIST ioctl. */ | |
360 | static int compat_insnlist(struct file *file, unsigned long arg) | |
361 | { | |
362 | struct combined_insnlist { | |
da613f4f | 363 | struct comedi_insnlist insnlist; |
90035c08 | 364 | struct comedi_insn insn[1]; |
ed9eccbe | 365 | } __user *s; |
bf8db92e BP |
366 | struct comedi32_insnlist_struct __user *insnlist32; |
367 | struct comedi32_insn_struct __user *insn32; | |
ed9eccbe DS |
368 | compat_uptr_t uptr; |
369 | unsigned int n_insns, n; | |
370 | int err, rc; | |
371 | ||
372 | insnlist32 = compat_ptr(arg); | |
373 | ||
374 | /* Get 32-bit insnlist structure. */ | |
375 | if (!access_ok(VERIFY_READ, insnlist32, sizeof(*insnlist32))) { | |
376 | return -EFAULT; | |
377 | } | |
378 | err = 0; | |
379 | err |= __get_user(n_insns, &insnlist32->n_insns); | |
380 | err |= __get_user(uptr, &insnlist32->insns); | |
381 | insn32 = compat_ptr(uptr); | |
82675f35 | 382 | if (err) |
ed9eccbe | 383 | return -EFAULT; |
ed9eccbe DS |
384 | |
385 | /* Allocate user memory to copy insnlist and insns into. */ | |
386 | s = compat_alloc_user_space(offsetof(struct combined_insnlist, | |
0a85b6f0 | 387 | insn[n_insns])); |
ed9eccbe DS |
388 | |
389 | /* Set native insnlist structure. */ | |
390 | if (!access_ok(VERIFY_WRITE, &s->insnlist, sizeof(s->insnlist))) { | |
391 | return -EFAULT; | |
392 | } | |
393 | err |= __put_user(n_insns, &s->insnlist.n_insns); | |
394 | err |= __put_user(&s->insn[0], &s->insnlist.insns); | |
82675f35 | 395 | if (err) |
ed9eccbe | 396 | return -EFAULT; |
ed9eccbe DS |
397 | |
398 | /* Copy insn structures. */ | |
399 | for (n = 0; n < n_insns; n++) { | |
400 | rc = get_compat_insn(&s->insn[n], &insn32[n]); | |
82675f35 | 401 | if (rc) |
ed9eccbe | 402 | return rc; |
ed9eccbe DS |
403 | } |
404 | ||
405 | return translated_ioctl(file, COMEDI_INSNLIST, | |
0a85b6f0 | 406 | (unsigned long)&s->insnlist); |
ed9eccbe DS |
407 | } |
408 | ||
409 | /* Handle 32-bit COMEDI_INSN ioctl. */ | |
410 | static int compat_insn(struct file *file, unsigned long arg) | |
411 | { | |
90035c08 | 412 | struct comedi_insn __user *insn; |
bf8db92e | 413 | struct comedi32_insn_struct __user *insn32; |
ed9eccbe DS |
414 | int rc; |
415 | ||
416 | insn32 = compat_ptr(arg); | |
417 | insn = compat_alloc_user_space(sizeof(*insn)); | |
418 | ||
419 | rc = get_compat_insn(insn, insn32); | |
82675f35 | 420 | if (rc) |
ed9eccbe | 421 | return rc; |
ed9eccbe DS |
422 | |
423 | return translated_ioctl(file, COMEDI_INSN, (unsigned long)insn); | |
424 | } | |
425 | ||
426 | /* Process untranslated ioctl. */ | |
427 | /* Returns -ENOIOCTLCMD for unrecognised ioctl codes. */ | |
428 | static inline int raw_ioctl(struct file *file, unsigned int cmd, | |
0a85b6f0 | 429 | unsigned long arg) |
ed9eccbe DS |
430 | { |
431 | int rc; | |
432 | ||
433 | switch (cmd) { | |
434 | case COMEDI_DEVCONFIG: | |
435 | case COMEDI_DEVINFO: | |
436 | case COMEDI_SUBDINFO: | |
437 | case COMEDI_BUFCONFIG: | |
438 | case COMEDI_BUFINFO: | |
439 | /* Just need to translate the pointer argument. */ | |
440 | arg = (unsigned long)compat_ptr(arg); | |
441 | rc = translated_ioctl(file, cmd, arg); | |
442 | break; | |
443 | case COMEDI_LOCK: | |
444 | case COMEDI_UNLOCK: | |
445 | case COMEDI_CANCEL: | |
446 | case COMEDI_POLL: | |
447 | /* No translation needed. */ | |
448 | rc = translated_ioctl(file, cmd, arg); | |
449 | break; | |
450 | case COMEDI32_CHANINFO: | |
451 | rc = compat_chaninfo(file, arg); | |
452 | break; | |
453 | case COMEDI32_RANGEINFO: | |
454 | rc = compat_rangeinfo(file, arg); | |
455 | break; | |
456 | case COMEDI32_CMD: | |
457 | rc = compat_cmd(file, arg); | |
458 | break; | |
459 | case COMEDI32_CMDTEST: | |
460 | rc = compat_cmdtest(file, arg); | |
461 | break; | |
462 | case COMEDI32_INSNLIST: | |
463 | rc = compat_insnlist(file, arg); | |
464 | break; | |
465 | case COMEDI32_INSN: | |
466 | rc = compat_insn(file, arg); | |
467 | break; | |
468 | default: | |
469 | rc = -ENOIOCTLCMD; | |
470 | break; | |
471 | } | |
472 | return rc; | |
473 | } | |
474 | ||
475 | #ifdef HAVE_COMPAT_IOCTL /* defined in <linux/fs.h> 2.6.11 onwards */ | |
476 | ||
477 | /* compat_ioctl file operation. */ | |
478 | /* Returns -ENOIOCTLCMD for unrecognised ioctl codes. */ | |
0a85b6f0 | 479 | long comedi_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ed9eccbe DS |
480 | { |
481 | return raw_ioctl(file, cmd, arg); | |
482 | } | |
483 | ||
484 | #else /* HAVE_COMPAT_IOCTL */ | |
485 | ||
486 | /* | |
487 | * Brain-dead ioctl compatibility for 2.6.10 and earlier. | |
488 | * | |
489 | * It's brain-dead because cmd numbers need to be unique system-wide! | |
490 | * The comedi driver could end up attempting to execute ioctls for non-Comedi | |
491 | * devices because it registered the system-wide cmd code first. Similarly, | |
492 | * another driver could end up attempting to execute ioctls for a Comedi | |
493 | * device because it registered the cmd code first. Chaos ensues. | |
494 | */ | |
495 | ||
496 | /* Handler for all 32-bit ioctl codes registered by this driver. */ | |
497 | static int mapped_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg, | |
0a85b6f0 | 498 | struct file *file) |
ed9eccbe DS |
499 | { |
500 | int rc; | |
501 | ||
502 | /* Make sure we are dealing with a Comedi device. */ | |
82675f35 | 503 | if (imajor(file->f_dentry->d_inode) != COMEDI_MAJOR) |
ed9eccbe | 504 | return -ENOTTY; |
82675f35 | 505 | |
ed9eccbe DS |
506 | rc = raw_ioctl(file, cmd, arg); |
507 | /* Do not return -ENOIOCTLCMD. */ | |
82675f35 | 508 | if (rc == -ENOIOCTLCMD) |
ed9eccbe | 509 | rc = -ENOTTY; |
82675f35 | 510 | |
ed9eccbe DS |
511 | return rc; |
512 | } | |
513 | ||
514 | struct ioctl32_map { | |
515 | unsigned int cmd; | |
0a85b6f0 | 516 | int (*handler) (unsigned int, unsigned int, unsigned long, |
ed9eccbe DS |
517 | struct file *); |
518 | int registered; | |
519 | }; | |
520 | ||
521 | static struct ioctl32_map comedi_ioctl32_map[] = { | |
0a85b6f0 MT |
522 | {COMEDI_DEVCONFIG, mapped_ioctl, 0}, |
523 | {COMEDI_DEVINFO, mapped_ioctl, 0}, | |
524 | {COMEDI_SUBDINFO, mapped_ioctl, 0}, | |
525 | {COMEDI_BUFCONFIG, mapped_ioctl, 0}, | |
526 | {COMEDI_BUFINFO, mapped_ioctl, 0}, | |
527 | {COMEDI_LOCK, mapped_ioctl, 0}, | |
528 | {COMEDI_UNLOCK, mapped_ioctl, 0}, | |
529 | {COMEDI_CANCEL, mapped_ioctl, 0}, | |
530 | {COMEDI_POLL, mapped_ioctl, 0}, | |
531 | {COMEDI32_CHANINFO, mapped_ioctl, 0}, | |
532 | {COMEDI32_RANGEINFO, mapped_ioctl, 0}, | |
533 | {COMEDI32_CMD, mapped_ioctl, 0}, | |
534 | {COMEDI32_CMDTEST, mapped_ioctl, 0}, | |
535 | {COMEDI32_INSNLIST, mapped_ioctl, 0}, | |
536 | {COMEDI32_INSN, mapped_ioctl, 0}, | |
ed9eccbe DS |
537 | }; |
538 | ||
539 | #define NUM_IOCTL32_MAPS ARRAY_SIZE(comedi_ioctl32_map) | |
540 | ||
541 | /* Register system-wide 32-bit ioctl handlers. */ | |
542 | void comedi_register_ioctl32(void) | |
543 | { | |
544 | int n, rc; | |
545 | ||
546 | for (n = 0; n < NUM_IOCTL32_MAPS; n++) { | |
547 | rc = register_ioctl32_conversion(comedi_ioctl32_map[n].cmd, | |
0a85b6f0 | 548 | comedi_ioctl32_map[n].handler); |
ed9eccbe DS |
549 | if (rc) { |
550 | printk(KERN_WARNING | |
0a85b6f0 MT |
551 | "comedi: failed to register 32-bit " |
552 | "compatible ioctl handler for 0x%X - " | |
553 | "expect bad things to happen!\n", | |
554 | comedi_ioctl32_map[n].cmd); | |
ed9eccbe DS |
555 | } |
556 | comedi_ioctl32_map[n].registered = !rc; | |
557 | } | |
558 | } | |
559 | ||
560 | /* Unregister system-wide 32-bit ioctl translations. */ | |
561 | void comedi_unregister_ioctl32(void) | |
562 | { | |
563 | int n, rc; | |
564 | ||
565 | for (n = 0; n < NUM_IOCTL32_MAPS; n++) { | |
566 | if (comedi_ioctl32_map[n].registered) { | |
0a85b6f0 MT |
567 | rc = unregister_ioctl32_conversion(comedi_ioctl32_map |
568 | [n].cmd, | |
569 | comedi_ioctl32_map | |
570 | [n].handler); | |
ed9eccbe DS |
571 | if (rc) { |
572 | printk(KERN_ERR | |
0a85b6f0 MT |
573 | "comedi: failed to unregister 32-bit " |
574 | "compatible ioctl handler for 0x%X - " | |
575 | "expect kernel Oops!\n", | |
576 | comedi_ioctl32_map[n].cmd); | |
ed9eccbe DS |
577 | } else { |
578 | comedi_ioctl32_map[n].registered = 0; | |
579 | } | |
580 | } | |
581 | } | |
582 | } | |
583 | ||
0a85b6f0 | 584 | #endif /* HAVE_COMPAT_IOCTL */ |
ed9eccbe | 585 | |
0a85b6f0 | 586 | #endif /* CONFIG_COMPAT */ |