Commit | Line | Data |
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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 | ||
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 */ |