Commit | Line | Data |
---|---|---|
ed9eccbe DS |
1 | /* |
2 | comedi/comedi_fops.c | |
3 | comedi kernel module | |
4 | ||
5 | COMEDI - Linux Control and Measurement Device Interface | |
6 | Copyright (C) 1997-2000 David A. Schleef <ds@schleef.org> | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
21 | ||
22 | */ | |
23 | ||
24 | #undef DEBUG | |
25 | ||
26 | #define __NO_VERSION__ | |
27 | #include "comedi_fops.h" | |
28 | #include "comedi_compat32.h" | |
29 | ||
30 | #include <linux/module.h> | |
31 | #include <linux/errno.h> | |
32 | #include <linux/kernel.h> | |
33 | #include <linux/sched.h> | |
34 | #include <linux/fcntl.h> | |
35 | #include <linux/delay.h> | |
36 | #include <linux/ioport.h> | |
37 | #include <linux/mm.h> | |
38 | #include <linux/slab.h> | |
39 | #include <linux/kmod.h> | |
40 | #include <linux/poll.h> | |
41 | #include <linux/init.h> | |
42 | #include <linux/device.h> | |
43 | #include <linux/vmalloc.h> | |
44 | #include <linux/fs.h> | |
45 | #include "comedidev.h" | |
46 | #include <linux/cdev.h> | |
47 | ||
476b8477 GKH |
48 | #include <linux/io.h> |
49 | #include <linux/uaccess.h> | |
ed9eccbe | 50 | |
476b8477 | 51 | /* #include "kvmem.h" */ |
ed9eccbe DS |
52 | |
53 | MODULE_AUTHOR("http://www.comedi.org"); | |
54 | MODULE_DESCRIPTION("Comedi core module"); | |
55 | MODULE_LICENSE("GPL"); | |
56 | ||
57 | #ifdef CONFIG_COMEDI_DEBUG | |
58 | int comedi_debug; | |
59 | module_param(comedi_debug, int, 0644); | |
60 | #endif | |
61 | ||
6a9d7a21 IA |
62 | int comedi_autoconfig = 1; |
63 | module_param(comedi_autoconfig, bool, 0444); | |
64 | ||
ed9eccbe | 65 | static DEFINE_SPINLOCK(comedi_file_info_table_lock); |
476b8477 GKH |
66 | static struct comedi_device_file_info |
67 | *comedi_file_info_table[COMEDI_NUM_MINORS]; | |
68 | ||
69 | static int do_devconfig_ioctl(comedi_device *dev, comedi_devconfig *arg); | |
70 | static int do_bufconfig_ioctl(comedi_device *dev, void *arg); | |
71 | static int do_devinfo_ioctl(comedi_device *dev, comedi_devinfo *arg, | |
72 | struct file *file); | |
73 | static int do_subdinfo_ioctl(comedi_device *dev, comedi_subdinfo *arg, | |
74 | void *file); | |
75 | static int do_chaninfo_ioctl(comedi_device *dev, comedi_chaninfo *arg); | |
76 | static int do_bufinfo_ioctl(comedi_device *dev, void *arg); | |
77 | static int do_cmd_ioctl(comedi_device *dev, void *arg, void *file); | |
78 | static int do_lock_ioctl(comedi_device *dev, unsigned int arg, void *file); | |
79 | static int do_unlock_ioctl(comedi_device *dev, unsigned int arg, void *file); | |
80 | static int do_cancel_ioctl(comedi_device *dev, unsigned int arg, void *file); | |
81 | static int do_cmdtest_ioctl(comedi_device *dev, void *arg, void *file); | |
82 | static int do_insnlist_ioctl(comedi_device *dev, void *arg, void *file); | |
83 | static int do_insn_ioctl(comedi_device *dev, void *arg, void *file); | |
84 | static int do_poll_ioctl(comedi_device *dev, unsigned int subd, void *file); | |
85 | ||
86 | extern void do_become_nonbusy(comedi_device *dev, comedi_subdevice *s); | |
87 | static int do_cancel(comedi_device *dev, comedi_subdevice *s); | |
ed9eccbe DS |
88 | |
89 | static int comedi_fasync(int fd, struct file *file, int on); | |
90 | ||
476b8477 | 91 | static int is_device_busy(comedi_device *dev); |
ed9eccbe DS |
92 | |
93 | #ifdef HAVE_UNLOCKED_IOCTL | |
94 | static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd, | |
476b8477 | 95 | unsigned long arg) |
ed9eccbe DS |
96 | #else |
97 | static int comedi_ioctl(struct inode *inode, struct file *file, | |
476b8477 | 98 | unsigned int cmd, unsigned long arg) |
ed9eccbe DS |
99 | #endif |
100 | { | |
101 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
476b8477 GKH |
102 | struct comedi_device_file_info *dev_file_info = |
103 | comedi_get_device_file_info(minor); | |
ed9eccbe DS |
104 | comedi_device *dev = dev_file_info->device; |
105 | int rc; | |
106 | ||
107 | mutex_lock(&dev->mutex); | |
108 | ||
109 | /* Device config is special, because it must work on | |
110 | * an unconfigured device. */ | |
111 | if (cmd == COMEDI_DEVCONFIG) { | |
112 | rc = do_devconfig_ioctl(dev, (void *)arg); | |
113 | goto done; | |
114 | } | |
115 | ||
116 | if (!dev->attached) { | |
117 | DPRINTK("no driver configured on /dev/comedi%i\n", dev->minor); | |
118 | rc = -ENODEV; | |
119 | goto done; | |
120 | } | |
121 | ||
122 | switch (cmd) { | |
123 | case COMEDI_BUFCONFIG: | |
124 | rc = do_bufconfig_ioctl(dev, (void *)arg); | |
125 | break; | |
126 | case COMEDI_DEVINFO: | |
127 | rc = do_devinfo_ioctl(dev, (void *)arg, file); | |
128 | break; | |
129 | case COMEDI_SUBDINFO: | |
130 | rc = do_subdinfo_ioctl(dev, (void *)arg, file); | |
131 | break; | |
132 | case COMEDI_CHANINFO: | |
133 | rc = do_chaninfo_ioctl(dev, (void *)arg); | |
134 | break; | |
135 | case COMEDI_RANGEINFO: | |
136 | rc = do_rangeinfo_ioctl(dev, (void *)arg); | |
137 | break; | |
138 | case COMEDI_BUFINFO: | |
139 | rc = do_bufinfo_ioctl(dev, (void *)arg); | |
140 | break; | |
141 | case COMEDI_LOCK: | |
142 | rc = do_lock_ioctl(dev, arg, file); | |
143 | break; | |
144 | case COMEDI_UNLOCK: | |
145 | rc = do_unlock_ioctl(dev, arg, file); | |
146 | break; | |
147 | case COMEDI_CANCEL: | |
148 | rc = do_cancel_ioctl(dev, arg, file); | |
149 | break; | |
150 | case COMEDI_CMD: | |
151 | rc = do_cmd_ioctl(dev, (void *)arg, file); | |
152 | break; | |
153 | case COMEDI_CMDTEST: | |
154 | rc = do_cmdtest_ioctl(dev, (void *)arg, file); | |
155 | break; | |
156 | case COMEDI_INSNLIST: | |
157 | rc = do_insnlist_ioctl(dev, (void *)arg, file); | |
158 | break; | |
159 | case COMEDI_INSN: | |
160 | rc = do_insn_ioctl(dev, (void *)arg, file); | |
161 | break; | |
162 | case COMEDI_POLL: | |
163 | rc = do_poll_ioctl(dev, arg, file); | |
164 | break; | |
165 | default: | |
166 | rc = -ENOTTY; | |
167 | break; | |
168 | } | |
169 | ||
476b8477 | 170 | done: |
ed9eccbe DS |
171 | mutex_unlock(&dev->mutex); |
172 | return rc; | |
173 | } | |
174 | ||
175 | /* | |
176 | COMEDI_DEVCONFIG | |
177 | device config ioctl | |
178 | ||
179 | arg: | |
180 | pointer to devconfig structure | |
181 | ||
182 | reads: | |
183 | devconfig structure at arg | |
184 | ||
185 | writes: | |
186 | none | |
187 | */ | |
476b8477 | 188 | static int do_devconfig_ioctl(comedi_device *dev, comedi_devconfig *arg) |
ed9eccbe DS |
189 | { |
190 | comedi_devconfig it; | |
191 | int ret; | |
192 | unsigned char *aux_data = NULL; | |
193 | int aux_len; | |
194 | ||
195 | if (!capable(CAP_SYS_ADMIN)) | |
196 | return -EPERM; | |
197 | ||
198 | if (arg == NULL) { | |
199 | if (is_device_busy(dev)) | |
200 | return -EBUSY; | |
476b8477 | 201 | if (dev->attached) { |
ed9eccbe DS |
202 | struct module *driver_module = dev->driver->module; |
203 | comedi_device_detach(dev); | |
204 | module_put(driver_module); | |
205 | } | |
206 | return 0; | |
207 | } | |
208 | ||
209 | if (copy_from_user(&it, arg, sizeof(comedi_devconfig))) | |
210 | return -EFAULT; | |
211 | ||
212 | it.board_name[COMEDI_NAMELEN - 1] = 0; | |
213 | ||
214 | if (comedi_aux_data(it.options, 0) && | |
476b8477 | 215 | it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) { |
ed9eccbe DS |
216 | int bit_shift; |
217 | aux_len = it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]; | |
218 | if (aux_len < 0) | |
219 | return -EFAULT; | |
220 | ||
221 | aux_data = vmalloc(aux_len); | |
222 | if (!aux_data) | |
223 | return -ENOMEM; | |
224 | ||
225 | if (copy_from_user(aux_data, | |
476b8477 | 226 | comedi_aux_data(it.options, 0), aux_len)) { |
ed9eccbe DS |
227 | vfree(aux_data); |
228 | return -EFAULT; | |
229 | } | |
230 | it.options[COMEDI_DEVCONF_AUX_DATA_LO] = | |
476b8477 | 231 | (unsigned long)aux_data; |
ed9eccbe DS |
232 | if (sizeof(void *) > sizeof(int)) { |
233 | bit_shift = sizeof(int) * 8; | |
234 | it.options[COMEDI_DEVCONF_AUX_DATA_HI] = | |
476b8477 | 235 | ((unsigned long)aux_data) >> bit_shift; |
ed9eccbe DS |
236 | } else |
237 | it.options[COMEDI_DEVCONF_AUX_DATA_HI] = 0; | |
238 | } | |
239 | ||
240 | ret = comedi_device_attach(dev, &it); | |
476b8477 GKH |
241 | if (ret == 0) { |
242 | if (!try_module_get(dev->driver->module)) { | |
ed9eccbe DS |
243 | comedi_device_detach(dev); |
244 | return -ENOSYS; | |
245 | } | |
246 | } | |
247 | ||
248 | if (aux_data) | |
249 | vfree(aux_data); | |
250 | ||
251 | return ret; | |
252 | } | |
253 | ||
254 | /* | |
255 | COMEDI_BUFCONFIG | |
256 | buffer configuration ioctl | |
257 | ||
258 | arg: | |
259 | pointer to bufconfig structure | |
260 | ||
261 | reads: | |
262 | bufconfig at arg | |
263 | ||
264 | writes: | |
265 | modified bufconfig at arg | |
266 | ||
267 | */ | |
476b8477 | 268 | static int do_bufconfig_ioctl(comedi_device *dev, void *arg) |
ed9eccbe DS |
269 | { |
270 | comedi_bufconfig bc; | |
271 | comedi_async *async; | |
272 | comedi_subdevice *s; | |
273 | int ret = 0; | |
274 | ||
275 | if (copy_from_user(&bc, arg, sizeof(comedi_bufconfig))) | |
276 | return -EFAULT; | |
277 | ||
278 | if (bc.subdevice >= dev->n_subdevices || bc.subdevice < 0) | |
279 | return -EINVAL; | |
280 | ||
281 | s = dev->subdevices + bc.subdevice; | |
282 | async = s->async; | |
283 | ||
284 | if (!async) { | |
285 | DPRINTK("subdevice does not have async capability\n"); | |
286 | bc.size = 0; | |
287 | bc.maximum_size = 0; | |
288 | goto copyback; | |
289 | } | |
290 | ||
291 | if (bc.maximum_size) { | |
292 | if (!capable(CAP_SYS_ADMIN)) | |
293 | return -EPERM; | |
294 | ||
295 | async->max_bufsize = bc.maximum_size; | |
296 | } | |
297 | ||
298 | if (bc.size) { | |
299 | if (bc.size > async->max_bufsize) | |
300 | return -EPERM; | |
301 | ||
302 | if (s->busy) { | |
303 | DPRINTK("subdevice is busy, cannot resize buffer\n"); | |
304 | return -EBUSY; | |
305 | } | |
306 | if (async->mmap_count) { | |
307 | DPRINTK("subdevice is mmapped, cannot resize buffer\n"); | |
308 | return -EBUSY; | |
309 | } | |
310 | ||
311 | if (!async->prealloc_buf) | |
312 | return -EINVAL; | |
313 | ||
314 | /* make sure buffer is an integral number of pages | |
315 | * (we round up) */ | |
316 | bc.size = (bc.size + PAGE_SIZE - 1) & PAGE_MASK; | |
317 | ||
318 | ret = comedi_buf_alloc(dev, s, bc.size); | |
319 | if (ret < 0) | |
320 | return ret; | |
321 | ||
322 | if (s->buf_change) { | |
323 | ret = s->buf_change(dev, s, bc.size); | |
324 | if (ret < 0) | |
325 | return ret; | |
326 | } | |
327 | ||
328 | DPRINTK("comedi%i subd %d buffer resized to %i bytes\n", | |
329 | dev->minor, bc.subdevice, async->prealloc_bufsz); | |
330 | } | |
331 | ||
332 | bc.size = async->prealloc_bufsz; | |
333 | bc.maximum_size = async->max_bufsize; | |
334 | ||
476b8477 | 335 | copyback: |
ed9eccbe DS |
336 | if (copy_to_user(arg, &bc, sizeof(comedi_bufconfig))) |
337 | return -EFAULT; | |
338 | ||
339 | return 0; | |
340 | } | |
341 | ||
342 | /* | |
343 | COMEDI_DEVINFO | |
344 | device info ioctl | |
345 | ||
346 | arg: | |
347 | pointer to devinfo structure | |
348 | ||
349 | reads: | |
350 | none | |
351 | ||
352 | writes: | |
353 | devinfo structure | |
354 | ||
355 | */ | |
476b8477 GKH |
356 | static int do_devinfo_ioctl(comedi_device *dev, comedi_devinfo *arg, |
357 | struct file *file) | |
ed9eccbe DS |
358 | { |
359 | comedi_devinfo devinfo; | |
360 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
476b8477 GKH |
361 | struct comedi_device_file_info *dev_file_info = |
362 | comedi_get_device_file_info(minor); | |
363 | comedi_subdevice *read_subdev = | |
364 | comedi_get_read_subdevice(dev_file_info); | |
365 | comedi_subdevice *write_subdev = | |
366 | comedi_get_write_subdevice(dev_file_info); | |
ed9eccbe DS |
367 | |
368 | memset(&devinfo, 0, sizeof(devinfo)); | |
369 | ||
370 | /* fill devinfo structure */ | |
371 | devinfo.version_code = COMEDI_VERSION_CODE; | |
372 | devinfo.n_subdevs = dev->n_subdevices; | |
373 | memcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN); | |
374 | memcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN); | |
375 | ||
476b8477 | 376 | if (read_subdev) |
ed9eccbe | 377 | devinfo.read_subdevice = read_subdev - dev->subdevices; |
476b8477 | 378 | else |
ed9eccbe | 379 | devinfo.read_subdevice = -1; |
476b8477 GKH |
380 | |
381 | if (write_subdev) | |
ed9eccbe | 382 | devinfo.write_subdevice = write_subdev - dev->subdevices; |
476b8477 | 383 | else |
ed9eccbe | 384 | devinfo.write_subdevice = -1; |
ed9eccbe DS |
385 | |
386 | if (copy_to_user(arg, &devinfo, sizeof(comedi_devinfo))) | |
387 | return -EFAULT; | |
388 | ||
389 | return 0; | |
390 | } | |
391 | ||
392 | /* | |
393 | COMEDI_SUBDINFO | |
394 | subdevice info ioctl | |
395 | ||
396 | arg: | |
397 | pointer to array of subdevice info structures | |
398 | ||
399 | reads: | |
400 | none | |
401 | ||
402 | writes: | |
403 | array of subdevice info structures at arg | |
404 | ||
405 | */ | |
476b8477 GKH |
406 | static int do_subdinfo_ioctl(comedi_device *dev, comedi_subdinfo *arg, |
407 | void *file) | |
ed9eccbe DS |
408 | { |
409 | int ret, i; | |
410 | comedi_subdinfo *tmp, *us; | |
411 | comedi_subdevice *s; | |
412 | ||
413 | tmp = kcalloc(dev->n_subdevices, sizeof(comedi_subdinfo), GFP_KERNEL); | |
414 | if (!tmp) | |
415 | return -ENOMEM; | |
416 | ||
417 | /* fill subdinfo structs */ | |
418 | for (i = 0; i < dev->n_subdevices; i++) { | |
419 | s = dev->subdevices + i; | |
420 | us = tmp + i; | |
421 | ||
422 | us->type = s->type; | |
423 | us->n_chan = s->n_chan; | |
424 | us->subd_flags = s->subdev_flags; | |
425 | if (comedi_get_subdevice_runflags(s) & SRF_RUNNING) | |
426 | us->subd_flags |= SDF_RUNNING; | |
427 | #define TIMER_nanosec 5 /* backwards compatibility */ | |
428 | us->timer_type = TIMER_nanosec; | |
429 | us->len_chanlist = s->len_chanlist; | |
430 | us->maxdata = s->maxdata; | |
431 | if (s->range_table) { | |
432 | us->range_type = | |
476b8477 | 433 | (i << 24) | (0 << 16) | (s->range_table->length); |
ed9eccbe DS |
434 | } else { |
435 | us->range_type = 0; /* XXX */ | |
436 | } | |
437 | us->flags = s->flags; | |
438 | ||
439 | if (s->busy) | |
440 | us->subd_flags |= SDF_BUSY; | |
441 | if (s->busy == file) | |
442 | us->subd_flags |= SDF_BUSY_OWNER; | |
443 | if (s->lock) | |
444 | us->subd_flags |= SDF_LOCKED; | |
445 | if (s->lock == file) | |
446 | us->subd_flags |= SDF_LOCK_OWNER; | |
447 | if (!s->maxdata && s->maxdata_list) | |
448 | us->subd_flags |= SDF_MAXDATA; | |
449 | if (s->flaglist) | |
450 | us->subd_flags |= SDF_FLAGS; | |
451 | if (s->range_table_list) | |
452 | us->subd_flags |= SDF_RANGETYPE; | |
453 | if (s->do_cmd) | |
454 | us->subd_flags |= SDF_CMD; | |
455 | ||
456 | if (s->insn_bits != &insn_inval) | |
457 | us->insn_bits_support = COMEDI_SUPPORTED; | |
458 | else | |
459 | us->insn_bits_support = COMEDI_UNSUPPORTED; | |
460 | ||
461 | us->settling_time_0 = s->settling_time_0; | |
462 | } | |
463 | ||
464 | ret = copy_to_user(arg, tmp, | |
476b8477 | 465 | dev->n_subdevices * sizeof(comedi_subdinfo)); |
ed9eccbe DS |
466 | |
467 | kfree(tmp); | |
468 | ||
469 | return ret ? -EFAULT : 0; | |
470 | } | |
471 | ||
472 | /* | |
473 | COMEDI_CHANINFO | |
474 | subdevice info ioctl | |
475 | ||
476 | arg: | |
477 | pointer to chaninfo structure | |
478 | ||
479 | reads: | |
480 | chaninfo structure at arg | |
481 | ||
482 | writes: | |
483 | arrays at elements of chaninfo structure | |
484 | ||
485 | */ | |
476b8477 | 486 | static int do_chaninfo_ioctl(comedi_device *dev, comedi_chaninfo *arg) |
ed9eccbe DS |
487 | { |
488 | comedi_subdevice *s; | |
489 | comedi_chaninfo it; | |
490 | ||
491 | if (copy_from_user(&it, arg, sizeof(comedi_chaninfo))) | |
492 | return -EFAULT; | |
493 | ||
494 | if (it.subdev >= dev->n_subdevices) | |
495 | return -EINVAL; | |
496 | s = dev->subdevices + it.subdev; | |
497 | ||
498 | if (it.maxdata_list) { | |
499 | if (s->maxdata || !s->maxdata_list) | |
500 | return -EINVAL; | |
501 | if (copy_to_user(it.maxdata_list, s->maxdata_list, | |
476b8477 | 502 | s->n_chan * sizeof(lsampl_t))) |
ed9eccbe DS |
503 | return -EFAULT; |
504 | } | |
505 | ||
506 | if (it.flaglist) { | |
507 | if (!s->flaglist) | |
508 | return -EINVAL; | |
509 | if (copy_to_user(it.flaglist, s->flaglist, | |
476b8477 | 510 | s->n_chan * sizeof(unsigned int))) |
ed9eccbe DS |
511 | return -EFAULT; |
512 | } | |
513 | ||
514 | if (it.rangelist) { | |
515 | int i; | |
516 | ||
517 | if (!s->range_table_list) | |
518 | return -EINVAL; | |
519 | for (i = 0; i < s->n_chan; i++) { | |
520 | int x; | |
521 | ||
522 | x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) | | |
476b8477 | 523 | (s->range_table_list[i]->length); |
ed9eccbe DS |
524 | put_user(x, it.rangelist + i); |
525 | } | |
476b8477 GKH |
526 | #if 0 |
527 | if (copy_to_user(it.rangelist, s->range_type_list, | |
528 | s->n_chan*sizeof(unsigned int))) | |
529 | return -EFAULT; | |
530 | #endif | |
ed9eccbe DS |
531 | } |
532 | ||
533 | return 0; | |
534 | } | |
535 | ||
536 | /* | |
537 | COMEDI_BUFINFO | |
538 | buffer information ioctl | |
539 | ||
540 | arg: | |
541 | pointer to bufinfo structure | |
542 | ||
543 | reads: | |
544 | bufinfo at arg | |
545 | ||
546 | writes: | |
547 | modified bufinfo at arg | |
548 | ||
549 | */ | |
476b8477 | 550 | static int do_bufinfo_ioctl(comedi_device *dev, void *arg) |
ed9eccbe DS |
551 | { |
552 | comedi_bufinfo bi; | |
553 | comedi_subdevice *s; | |
554 | comedi_async *async; | |
555 | ||
556 | if (copy_from_user(&bi, arg, sizeof(comedi_bufinfo))) | |
557 | return -EFAULT; | |
558 | ||
559 | if (bi.subdevice >= dev->n_subdevices || bi.subdevice < 0) | |
560 | return -EINVAL; | |
561 | ||
562 | s = dev->subdevices + bi.subdevice; | |
563 | async = s->async; | |
564 | ||
565 | if (!async) { | |
566 | DPRINTK("subdevice does not have async capability\n"); | |
567 | bi.buf_write_ptr = 0; | |
568 | bi.buf_read_ptr = 0; | |
569 | bi.buf_write_count = 0; | |
570 | bi.buf_read_count = 0; | |
571 | goto copyback; | |
572 | } | |
573 | ||
574 | if (bi.bytes_read && (s->subdev_flags & SDF_CMD_READ)) { | |
575 | bi.bytes_read = comedi_buf_read_alloc(async, bi.bytes_read); | |
576 | comedi_buf_read_free(async, bi.bytes_read); | |
577 | ||
578 | if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | | |
476b8477 GKH |
579 | SRF_RUNNING)) |
580 | && async->buf_write_count == async->buf_read_count) { | |
ed9eccbe DS |
581 | do_become_nonbusy(dev, s); |
582 | } | |
583 | } | |
584 | ||
585 | if (bi.bytes_written && (s->subdev_flags & SDF_CMD_WRITE)) { | |
586 | bi.bytes_written = | |
476b8477 | 587 | comedi_buf_write_alloc(async, bi.bytes_written); |
ed9eccbe DS |
588 | comedi_buf_write_free(async, bi.bytes_written); |
589 | } | |
590 | ||
591 | bi.buf_write_count = async->buf_write_count; | |
592 | bi.buf_write_ptr = async->buf_write_ptr; | |
593 | bi.buf_read_count = async->buf_read_count; | |
594 | bi.buf_read_ptr = async->buf_read_ptr; | |
595 | ||
476b8477 | 596 | copyback: |
ed9eccbe DS |
597 | if (copy_to_user(arg, &bi, sizeof(comedi_bufinfo))) |
598 | return -EFAULT; | |
599 | ||
600 | return 0; | |
601 | } | |
602 | ||
476b8477 GKH |
603 | static int parse_insn(comedi_device *dev, comedi_insn *insn, lsampl_t *data, |
604 | void *file); | |
ed9eccbe DS |
605 | /* |
606 | * COMEDI_INSNLIST | |
607 | * synchronous instructions | |
608 | * | |
609 | * arg: | |
610 | * pointer to sync cmd structure | |
611 | * | |
612 | * reads: | |
613 | * sync cmd struct at arg | |
614 | * instruction list | |
615 | * data (for writes) | |
616 | * | |
617 | * writes: | |
618 | * data (for reads) | |
619 | */ | |
620 | /* arbitrary limits */ | |
621 | #define MAX_SAMPLES 256 | |
476b8477 | 622 | static int do_insnlist_ioctl(comedi_device *dev, void *arg, void *file) |
ed9eccbe DS |
623 | { |
624 | comedi_insnlist insnlist; | |
625 | comedi_insn *insns = NULL; | |
626 | lsampl_t *data = NULL; | |
627 | int i = 0; | |
628 | int ret = 0; | |
629 | ||
630 | if (copy_from_user(&insnlist, arg, sizeof(comedi_insnlist))) | |
631 | return -EFAULT; | |
632 | ||
633 | data = kmalloc(sizeof(lsampl_t) * MAX_SAMPLES, GFP_KERNEL); | |
634 | if (!data) { | |
635 | DPRINTK("kmalloc failed\n"); | |
636 | ret = -ENOMEM; | |
637 | goto error; | |
638 | } | |
639 | ||
640 | insns = kmalloc(sizeof(comedi_insn) * insnlist.n_insns, GFP_KERNEL); | |
641 | if (!insns) { | |
642 | DPRINTK("kmalloc failed\n"); | |
643 | ret = -ENOMEM; | |
644 | goto error; | |
645 | } | |
646 | ||
647 | if (copy_from_user(insns, insnlist.insns, | |
476b8477 | 648 | sizeof(comedi_insn) * insnlist.n_insns)) { |
ed9eccbe DS |
649 | DPRINTK("copy_from_user failed\n"); |
650 | ret = -EFAULT; | |
651 | goto error; | |
652 | } | |
653 | ||
654 | for (i = 0; i < insnlist.n_insns; i++) { | |
655 | if (insns[i].n > MAX_SAMPLES) { | |
656 | DPRINTK("number of samples too large\n"); | |
657 | ret = -EINVAL; | |
658 | goto error; | |
659 | } | |
660 | if (insns[i].insn & INSN_MASK_WRITE) { | |
661 | if (copy_from_user(data, insns[i].data, | |
476b8477 | 662 | insns[i].n * sizeof(lsampl_t))) { |
ed9eccbe DS |
663 | DPRINTK("copy_from_user failed\n"); |
664 | ret = -EFAULT; | |
665 | goto error; | |
666 | } | |
667 | } | |
668 | ret = parse_insn(dev, insns + i, data, file); | |
669 | if (ret < 0) | |
670 | goto error; | |
671 | if (insns[i].insn & INSN_MASK_READ) { | |
672 | if (copy_to_user(insns[i].data, data, | |
476b8477 | 673 | insns[i].n * sizeof(lsampl_t))) { |
ed9eccbe DS |
674 | DPRINTK("copy_to_user failed\n"); |
675 | ret = -EFAULT; | |
676 | goto error; | |
677 | } | |
678 | } | |
679 | if (need_resched()) | |
680 | schedule(); | |
681 | } | |
682 | ||
476b8477 GKH |
683 | error: |
684 | kfree(insns); | |
685 | kfree(data); | |
ed9eccbe DS |
686 | |
687 | if (ret < 0) | |
688 | return ret; | |
689 | return i; | |
690 | } | |
691 | ||
476b8477 | 692 | static int check_insn_config_length(comedi_insn *insn, lsampl_t *data) |
ed9eccbe | 693 | { |
476b8477 GKH |
694 | if (insn->n < 1) |
695 | return -EINVAL; | |
ed9eccbe DS |
696 | |
697 | switch (data[0]) { | |
698 | case INSN_CONFIG_DIO_OUTPUT: | |
699 | case INSN_CONFIG_DIO_INPUT: | |
700 | case INSN_CONFIG_DISARM: | |
701 | case INSN_CONFIG_RESET: | |
702 | if (insn->n == 1) | |
703 | return 0; | |
704 | break; | |
705 | case INSN_CONFIG_ARM: | |
706 | case INSN_CONFIG_DIO_QUERY: | |
707 | case INSN_CONFIG_BLOCK_SIZE: | |
708 | case INSN_CONFIG_FILTER: | |
709 | case INSN_CONFIG_SERIAL_CLOCK: | |
710 | case INSN_CONFIG_BIDIRECTIONAL_DATA: | |
711 | case INSN_CONFIG_ALT_SOURCE: | |
712 | case INSN_CONFIG_SET_COUNTER_MODE: | |
713 | case INSN_CONFIG_8254_READ_STATUS: | |
714 | case INSN_CONFIG_SET_ROUTING: | |
715 | case INSN_CONFIG_GET_ROUTING: | |
716 | case INSN_CONFIG_GET_PWM_STATUS: | |
717 | case INSN_CONFIG_PWM_SET_PERIOD: | |
718 | case INSN_CONFIG_PWM_GET_PERIOD: | |
719 | if (insn->n == 2) | |
720 | return 0; | |
721 | break; | |
722 | case INSN_CONFIG_SET_GATE_SRC: | |
723 | case INSN_CONFIG_GET_GATE_SRC: | |
724 | case INSN_CONFIG_SET_CLOCK_SRC: | |
725 | case INSN_CONFIG_GET_CLOCK_SRC: | |
726 | case INSN_CONFIG_SET_OTHER_SRC: | |
727 | case INSN_CONFIG_GET_COUNTER_STATUS: | |
728 | case INSN_CONFIG_PWM_SET_H_BRIDGE: | |
729 | case INSN_CONFIG_PWM_GET_H_BRIDGE: | |
730 | case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE: | |
731 | if (insn->n == 3) | |
732 | return 0; | |
733 | break; | |
734 | case INSN_CONFIG_PWM_OUTPUT: | |
735 | case INSN_CONFIG_ANALOG_TRIG: | |
736 | if (insn->n == 5) | |
737 | return 0; | |
738 | break; | |
476b8477 GKH |
739 | /* by default we allow the insn since we don't have checks for |
740 | * all possible cases yet */ | |
ed9eccbe | 741 | default: |
476b8477 GKH |
742 | rt_printk("comedi: no check for data length of config insn id " |
743 | "%i is implemented.\n" | |
744 | " Add a check to %s in %s.\n" | |
745 | " Assuming n=%i is correct.\n", data[0], __func__, | |
746 | __FILE__, insn->n); | |
ed9eccbe DS |
747 | return 0; |
748 | break; | |
749 | } | |
750 | return -EINVAL; | |
751 | } | |
752 | ||
476b8477 GKH |
753 | static int parse_insn(comedi_device *dev, comedi_insn *insn, lsampl_t *data, |
754 | void *file) | |
ed9eccbe DS |
755 | { |
756 | comedi_subdevice *s; | |
757 | int ret = 0; | |
758 | int i; | |
759 | ||
760 | if (insn->insn & INSN_MASK_SPECIAL) { | |
761 | /* a non-subdevice instruction */ | |
762 | ||
763 | switch (insn->insn) { | |
764 | case INSN_GTOD: | |
765 | { | |
766 | struct timeval tv; | |
767 | ||
768 | if (insn->n != 2) { | |
769 | ret = -EINVAL; | |
770 | break; | |
771 | } | |
772 | ||
773 | do_gettimeofday(&tv); | |
774 | data[0] = tv.tv_sec; | |
775 | data[1] = tv.tv_usec; | |
776 | ret = 2; | |
777 | ||
778 | break; | |
779 | } | |
780 | case INSN_WAIT: | |
781 | if (insn->n != 1 || data[0] >= 100000) { | |
782 | ret = -EINVAL; | |
783 | break; | |
784 | } | |
785 | udelay(data[0] / 1000); | |
786 | ret = 1; | |
787 | break; | |
788 | case INSN_INTTRIG: | |
789 | if (insn->n != 1) { | |
790 | ret = -EINVAL; | |
791 | break; | |
792 | } | |
793 | if (insn->subdev >= dev->n_subdevices) { | |
794 | DPRINTK("%d not usable subdevice\n", | |
795 | insn->subdev); | |
796 | ret = -EINVAL; | |
797 | break; | |
798 | } | |
799 | s = dev->subdevices + insn->subdev; | |
800 | if (!s->async) { | |
801 | DPRINTK("no async\n"); | |
802 | ret = -EINVAL; | |
803 | break; | |
804 | } | |
805 | if (!s->async->inttrig) { | |
806 | DPRINTK("no inttrig\n"); | |
807 | ret = -EAGAIN; | |
808 | break; | |
809 | } | |
810 | ret = s->async->inttrig(dev, s, insn->data[0]); | |
811 | if (ret >= 0) | |
812 | ret = 1; | |
813 | break; | |
814 | default: | |
815 | DPRINTK("invalid insn\n"); | |
816 | ret = -EINVAL; | |
817 | break; | |
818 | } | |
819 | } else { | |
820 | /* a subdevice instruction */ | |
821 | lsampl_t maxdata; | |
822 | ||
823 | if (insn->subdev >= dev->n_subdevices) { | |
824 | DPRINTK("subdevice %d out of range\n", insn->subdev); | |
825 | ret = -EINVAL; | |
826 | goto out; | |
827 | } | |
828 | s = dev->subdevices + insn->subdev; | |
829 | ||
830 | if (s->type == COMEDI_SUBD_UNUSED) { | |
831 | DPRINTK("%d not usable subdevice\n", insn->subdev); | |
832 | ret = -EIO; | |
833 | goto out; | |
834 | } | |
835 | ||
836 | /* are we locked? (ioctl lock) */ | |
837 | if (s->lock && s->lock != file) { | |
838 | DPRINTK("device locked\n"); | |
839 | ret = -EACCES; | |
840 | goto out; | |
841 | } | |
842 | ||
476b8477 GKH |
843 | ret = check_chanlist(s, 1, &insn->chanspec); |
844 | if (ret < 0) { | |
ed9eccbe DS |
845 | ret = -EINVAL; |
846 | DPRINTK("bad chanspec\n"); | |
847 | goto out; | |
848 | } | |
849 | ||
850 | if (s->busy) { | |
851 | ret = -EBUSY; | |
852 | goto out; | |
853 | } | |
854 | /* This looks arbitrary. It is. */ | |
855 | s->busy = &parse_insn; | |
856 | switch (insn->insn) { | |
857 | case INSN_READ: | |
858 | ret = s->insn_read(dev, s, insn, data); | |
859 | break; | |
860 | case INSN_WRITE: | |
861 | maxdata = s->maxdata_list | |
476b8477 GKH |
862 | ? s->maxdata_list[CR_CHAN(insn->chanspec)] |
863 | : s->maxdata; | |
ed9eccbe DS |
864 | for (i = 0; i < insn->n; ++i) { |
865 | if (data[i] > maxdata) { | |
866 | ret = -EINVAL; | |
867 | DPRINTK("bad data value(s)\n"); | |
868 | break; | |
869 | } | |
870 | } | |
871 | if (ret == 0) | |
872 | ret = s->insn_write(dev, s, insn, data); | |
873 | break; | |
874 | case INSN_BITS: | |
875 | if (insn->n != 2) { | |
876 | ret = -EINVAL; | |
877 | break; | |
878 | } | |
879 | ret = s->insn_bits(dev, s, insn, data); | |
880 | break; | |
881 | case INSN_CONFIG: | |
882 | ret = check_insn_config_length(insn, data); | |
883 | if (ret) | |
884 | break; | |
885 | ret = s->insn_config(dev, s, insn, data); | |
886 | break; | |
887 | default: | |
888 | ret = -EINVAL; | |
889 | break; | |
890 | } | |
891 | ||
892 | s->busy = NULL; | |
893 | } | |
894 | ||
476b8477 | 895 | out: |
ed9eccbe DS |
896 | return ret; |
897 | } | |
898 | ||
899 | /* | |
900 | * COMEDI_INSN | |
901 | * synchronous instructions | |
902 | * | |
903 | * arg: | |
904 | * pointer to insn | |
905 | * | |
906 | * reads: | |
907 | * comedi_insn struct at arg | |
908 | * data (for writes) | |
909 | * | |
910 | * writes: | |
911 | * data (for reads) | |
912 | */ | |
476b8477 | 913 | static int do_insn_ioctl(comedi_device *dev, void *arg, void *file) |
ed9eccbe DS |
914 | { |
915 | comedi_insn insn; | |
916 | lsampl_t *data = NULL; | |
917 | int ret = 0; | |
918 | ||
919 | data = kmalloc(sizeof(lsampl_t) * MAX_SAMPLES, GFP_KERNEL); | |
920 | if (!data) { | |
921 | ret = -ENOMEM; | |
922 | goto error; | |
923 | } | |
924 | ||
925 | if (copy_from_user(&insn, arg, sizeof(comedi_insn))) { | |
926 | ret = -EFAULT; | |
927 | goto error; | |
928 | } | |
929 | ||
930 | /* This is where the behavior of insn and insnlist deviate. */ | |
931 | if (insn.n > MAX_SAMPLES) | |
932 | insn.n = MAX_SAMPLES; | |
933 | if (insn.insn & INSN_MASK_WRITE) { | |
934 | if (copy_from_user(data, insn.data, insn.n * sizeof(lsampl_t))) { | |
935 | ret = -EFAULT; | |
936 | goto error; | |
937 | } | |
938 | } | |
939 | ret = parse_insn(dev, &insn, data, file); | |
940 | if (ret < 0) | |
941 | goto error; | |
942 | if (insn.insn & INSN_MASK_READ) { | |
943 | if (copy_to_user(insn.data, data, insn.n * sizeof(lsampl_t))) { | |
944 | ret = -EFAULT; | |
945 | goto error; | |
946 | } | |
947 | } | |
948 | ret = insn.n; | |
949 | ||
476b8477 GKH |
950 | error: |
951 | kfree(data); | |
ed9eccbe DS |
952 | |
953 | return ret; | |
954 | } | |
955 | ||
956 | /* | |
957 | COMEDI_CMD | |
958 | command ioctl | |
959 | ||
960 | arg: | |
961 | pointer to cmd structure | |
962 | ||
963 | reads: | |
964 | cmd structure at arg | |
965 | channel/range list | |
966 | ||
967 | writes: | |
968 | modified cmd structure at arg | |
969 | ||
970 | */ | |
476b8477 | 971 | static int do_cmd_ioctl(comedi_device *dev, void *arg, void *file) |
ed9eccbe DS |
972 | { |
973 | comedi_cmd user_cmd; | |
974 | comedi_subdevice *s; | |
975 | comedi_async *async; | |
976 | int ret = 0; | |
977 | unsigned int *chanlist_saver = NULL; | |
978 | ||
979 | if (copy_from_user(&user_cmd, arg, sizeof(comedi_cmd))) { | |
980 | DPRINTK("bad cmd address\n"); | |
981 | return -EFAULT; | |
982 | } | |
476b8477 | 983 | /* save user's chanlist pointer so it can be restored later */ |
ed9eccbe DS |
984 | chanlist_saver = user_cmd.chanlist; |
985 | ||
986 | if (user_cmd.subdev >= dev->n_subdevices) { | |
987 | DPRINTK("%d no such subdevice\n", user_cmd.subdev); | |
988 | return -ENODEV; | |
989 | } | |
990 | ||
991 | s = dev->subdevices + user_cmd.subdev; | |
992 | async = s->async; | |
993 | ||
994 | if (s->type == COMEDI_SUBD_UNUSED) { | |
995 | DPRINTK("%d not valid subdevice\n", user_cmd.subdev); | |
996 | return -EIO; | |
997 | } | |
998 | ||
999 | if (!s->do_cmd || !s->do_cmdtest || !s->async) { | |
1000 | DPRINTK("subdevice %i does not support commands\n", | |
1001 | user_cmd.subdev); | |
1002 | return -EIO; | |
1003 | } | |
1004 | ||
1005 | /* are we locked? (ioctl lock) */ | |
1006 | if (s->lock && s->lock != file) { | |
1007 | DPRINTK("subdevice locked\n"); | |
1008 | return -EACCES; | |
1009 | } | |
1010 | ||
1011 | /* are we busy? */ | |
1012 | if (s->busy) { | |
1013 | DPRINTK("subdevice busy\n"); | |
1014 | return -EBUSY; | |
1015 | } | |
1016 | s->busy = file; | |
1017 | ||
1018 | /* make sure channel/gain list isn't too long */ | |
1019 | if (user_cmd.chanlist_len > s->len_chanlist) { | |
1020 | DPRINTK("channel/gain list too long %u > %d\n", | |
1021 | user_cmd.chanlist_len, s->len_chanlist); | |
1022 | ret = -EINVAL; | |
1023 | goto cleanup; | |
1024 | } | |
1025 | ||
1026 | /* make sure channel/gain list isn't too short */ | |
1027 | if (user_cmd.chanlist_len < 1) { | |
1028 | DPRINTK("channel/gain list too short %u < 1\n", | |
1029 | user_cmd.chanlist_len); | |
1030 | ret = -EINVAL; | |
1031 | goto cleanup; | |
1032 | } | |
1033 | ||
476b8477 | 1034 | kfree(async->cmd.chanlist); |
ed9eccbe DS |
1035 | async->cmd = user_cmd; |
1036 | async->cmd.data = NULL; | |
1037 | /* load channel/gain list */ | |
1038 | async->cmd.chanlist = | |
476b8477 | 1039 | kmalloc(async->cmd.chanlist_len * sizeof(int), GFP_KERNEL); |
ed9eccbe DS |
1040 | if (!async->cmd.chanlist) { |
1041 | DPRINTK("allocation failed\n"); | |
1042 | ret = -ENOMEM; | |
1043 | goto cleanup; | |
1044 | } | |
1045 | ||
1046 | if (copy_from_user(async->cmd.chanlist, user_cmd.chanlist, | |
476b8477 | 1047 | async->cmd.chanlist_len * sizeof(int))) { |
ed9eccbe DS |
1048 | DPRINTK("fault reading chanlist\n"); |
1049 | ret = -EFAULT; | |
1050 | goto cleanup; | |
1051 | } | |
1052 | ||
1053 | /* make sure each element in channel/gain list is valid */ | |
476b8477 GKH |
1054 | ret = check_chanlist(s, async->cmd.chanlist_len, async->cmd.chanlist); |
1055 | if (ret < 0) { | |
ed9eccbe DS |
1056 | DPRINTK("bad chanlist\n"); |
1057 | goto cleanup; | |
1058 | } | |
1059 | ||
1060 | ret = s->do_cmdtest(dev, s, &async->cmd); | |
1061 | ||
1062 | if (async->cmd.flags & TRIG_BOGUS || ret) { | |
1063 | DPRINTK("test returned %d\n", ret); | |
1064 | user_cmd = async->cmd; | |
476b8477 | 1065 | /* restore chanlist pointer before copying back */ |
ed9eccbe DS |
1066 | user_cmd.chanlist = chanlist_saver; |
1067 | user_cmd.data = NULL; | |
1068 | if (copy_to_user(arg, &user_cmd, sizeof(comedi_cmd))) { | |
1069 | DPRINTK("fault writing cmd\n"); | |
1070 | ret = -EFAULT; | |
1071 | goto cleanup; | |
1072 | } | |
1073 | ret = -EAGAIN; | |
1074 | goto cleanup; | |
1075 | } | |
1076 | ||
1077 | if (!async->prealloc_bufsz) { | |
1078 | ret = -ENOMEM; | |
1079 | DPRINTK("no buffer (?)\n"); | |
1080 | goto cleanup; | |
1081 | } | |
1082 | ||
1083 | comedi_reset_async_buf(async); | |
1084 | ||
1085 | async->cb_mask = | |
476b8477 GKH |
1086 | COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR | |
1087 | COMEDI_CB_OVERFLOW; | |
1088 | if (async->cmd.flags & TRIG_WAKE_EOS) | |
ed9eccbe | 1089 | async->cb_mask |= COMEDI_CB_EOS; |
ed9eccbe DS |
1090 | |
1091 | comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING); | |
1092 | ||
1093 | #ifdef CONFIG_COMEDI_RT | |
1094 | if (async->cmd.flags & TRIG_RT) { | |
1095 | if (comedi_switch_to_rt(dev) == 0) | |
1096 | comedi_set_subdevice_runflags(s, SRF_RT, SRF_RT); | |
1097 | } | |
1098 | #endif | |
1099 | ||
1100 | ret = s->do_cmd(dev, s); | |
1101 | if (ret == 0) | |
1102 | return 0; | |
1103 | ||
476b8477 | 1104 | cleanup: |
ed9eccbe DS |
1105 | do_become_nonbusy(dev, s); |
1106 | ||
1107 | return ret; | |
1108 | } | |
1109 | ||
1110 | /* | |
1111 | COMEDI_CMDTEST | |
1112 | command testing ioctl | |
1113 | ||
1114 | arg: | |
1115 | pointer to cmd structure | |
1116 | ||
1117 | reads: | |
1118 | cmd structure at arg | |
1119 | channel/range list | |
1120 | ||
1121 | writes: | |
1122 | modified cmd structure at arg | |
1123 | ||
1124 | */ | |
476b8477 | 1125 | static int do_cmdtest_ioctl(comedi_device *dev, void *arg, void *file) |
ed9eccbe DS |
1126 | { |
1127 | comedi_cmd user_cmd; | |
1128 | comedi_subdevice *s; | |
1129 | int ret = 0; | |
1130 | unsigned int *chanlist = NULL; | |
1131 | unsigned int *chanlist_saver = NULL; | |
1132 | ||
1133 | if (copy_from_user(&user_cmd, arg, sizeof(comedi_cmd))) { | |
1134 | DPRINTK("bad cmd address\n"); | |
1135 | return -EFAULT; | |
1136 | } | |
476b8477 | 1137 | /* save user's chanlist pointer so it can be restored later */ |
ed9eccbe DS |
1138 | chanlist_saver = user_cmd.chanlist; |
1139 | ||
1140 | if (user_cmd.subdev >= dev->n_subdevices) { | |
1141 | DPRINTK("%d no such subdevice\n", user_cmd.subdev); | |
1142 | return -ENODEV; | |
1143 | } | |
1144 | ||
1145 | s = dev->subdevices + user_cmd.subdev; | |
1146 | if (s->type == COMEDI_SUBD_UNUSED) { | |
1147 | DPRINTK("%d not valid subdevice\n", user_cmd.subdev); | |
1148 | return -EIO; | |
1149 | } | |
1150 | ||
1151 | if (!s->do_cmd || !s->do_cmdtest) { | |
1152 | DPRINTK("subdevice %i does not support commands\n", | |
1153 | user_cmd.subdev); | |
1154 | return -EIO; | |
1155 | } | |
1156 | ||
1157 | /* make sure channel/gain list isn't too long */ | |
1158 | if (user_cmd.chanlist_len > s->len_chanlist) { | |
1159 | DPRINTK("channel/gain list too long %d > %d\n", | |
1160 | user_cmd.chanlist_len, s->len_chanlist); | |
1161 | ret = -EINVAL; | |
1162 | goto cleanup; | |
1163 | } | |
1164 | ||
1165 | /* load channel/gain list */ | |
1166 | if (user_cmd.chanlist) { | |
1167 | chanlist = | |
476b8477 | 1168 | kmalloc(user_cmd.chanlist_len * sizeof(int), GFP_KERNEL); |
ed9eccbe DS |
1169 | if (!chanlist) { |
1170 | DPRINTK("allocation failed\n"); | |
1171 | ret = -ENOMEM; | |
1172 | goto cleanup; | |
1173 | } | |
1174 | ||
1175 | if (copy_from_user(chanlist, user_cmd.chanlist, | |
476b8477 | 1176 | user_cmd.chanlist_len * sizeof(int))) { |
ed9eccbe DS |
1177 | DPRINTK("fault reading chanlist\n"); |
1178 | ret = -EFAULT; | |
1179 | goto cleanup; | |
1180 | } | |
1181 | ||
1182 | /* make sure each element in channel/gain list is valid */ | |
476b8477 GKH |
1183 | ret = check_chanlist(s, user_cmd.chanlist_len, chanlist); |
1184 | if (ret < 0) { | |
ed9eccbe DS |
1185 | DPRINTK("bad chanlist\n"); |
1186 | goto cleanup; | |
1187 | } | |
1188 | ||
1189 | user_cmd.chanlist = chanlist; | |
1190 | } | |
1191 | ||
1192 | ret = s->do_cmdtest(dev, s, &user_cmd); | |
1193 | ||
476b8477 | 1194 | /* restore chanlist pointer before copying back */ |
ed9eccbe DS |
1195 | user_cmd.chanlist = chanlist_saver; |
1196 | ||
1197 | if (copy_to_user(arg, &user_cmd, sizeof(comedi_cmd))) { | |
1198 | DPRINTK("bad cmd address\n"); | |
1199 | ret = -EFAULT; | |
1200 | goto cleanup; | |
1201 | } | |
476b8477 GKH |
1202 | cleanup: |
1203 | kfree(chanlist); | |
ed9eccbe DS |
1204 | |
1205 | return ret; | |
1206 | } | |
1207 | ||
1208 | /* | |
1209 | COMEDI_LOCK | |
1210 | lock subdevice | |
1211 | ||
1212 | arg: | |
1213 | subdevice number | |
1214 | ||
1215 | reads: | |
1216 | none | |
1217 | ||
1218 | writes: | |
1219 | none | |
1220 | ||
1221 | */ | |
1222 | ||
476b8477 | 1223 | static int do_lock_ioctl(comedi_device *dev, unsigned int arg, void *file) |
ed9eccbe DS |
1224 | { |
1225 | int ret = 0; | |
1226 | unsigned long flags; | |
1227 | comedi_subdevice *s; | |
1228 | ||
1229 | if (arg >= dev->n_subdevices) | |
1230 | return -EINVAL; | |
1231 | s = dev->subdevices + arg; | |
1232 | ||
1233 | comedi_spin_lock_irqsave(&s->spin_lock, flags); | |
476b8477 | 1234 | if (s->busy || s->lock) |
ed9eccbe | 1235 | ret = -EBUSY; |
476b8477 | 1236 | else |
ed9eccbe | 1237 | s->lock = file; |
ed9eccbe DS |
1238 | comedi_spin_unlock_irqrestore(&s->spin_lock, flags); |
1239 | ||
1240 | if (ret < 0) | |
1241 | return ret; | |
1242 | ||
1243 | #if 0 | |
1244 | if (s->lock_f) | |
1245 | ret = s->lock_f(dev, s); | |
1246 | #endif | |
1247 | ||
1248 | return ret; | |
1249 | } | |
1250 | ||
1251 | /* | |
1252 | COMEDI_UNLOCK | |
1253 | unlock subdevice | |
1254 | ||
1255 | arg: | |
1256 | subdevice number | |
1257 | ||
1258 | reads: | |
1259 | none | |
1260 | ||
1261 | writes: | |
1262 | none | |
1263 | ||
1264 | This function isn't protected by the semaphore, since | |
1265 | we already own the lock. | |
1266 | */ | |
476b8477 | 1267 | static int do_unlock_ioctl(comedi_device *dev, unsigned int arg, void *file) |
ed9eccbe DS |
1268 | { |
1269 | comedi_subdevice *s; | |
1270 | ||
1271 | if (arg >= dev->n_subdevices) | |
1272 | return -EINVAL; | |
1273 | s = dev->subdevices + arg; | |
1274 | ||
1275 | if (s->busy) | |
1276 | return -EBUSY; | |
1277 | ||
1278 | if (s->lock && s->lock != file) | |
1279 | return -EACCES; | |
1280 | ||
1281 | if (s->lock == file) { | |
1282 | #if 0 | |
1283 | if (s->unlock) | |
1284 | s->unlock(dev, s); | |
1285 | #endif | |
1286 | ||
1287 | s->lock = NULL; | |
1288 | } | |
1289 | ||
1290 | return 0; | |
1291 | } | |
1292 | ||
1293 | /* | |
1294 | COMEDI_CANCEL | |
1295 | cancel acquisition ioctl | |
1296 | ||
1297 | arg: | |
1298 | subdevice number | |
1299 | ||
1300 | reads: | |
1301 | nothing | |
1302 | ||
1303 | writes: | |
1304 | nothing | |
1305 | ||
1306 | */ | |
476b8477 | 1307 | static int do_cancel_ioctl(comedi_device *dev, unsigned int arg, void *file) |
ed9eccbe DS |
1308 | { |
1309 | comedi_subdevice *s; | |
1310 | ||
1311 | if (arg >= dev->n_subdevices) | |
1312 | return -EINVAL; | |
1313 | s = dev->subdevices + arg; | |
1314 | if (s->async == NULL) | |
1315 | return -EINVAL; | |
1316 | ||
1317 | if (s->lock && s->lock != file) | |
1318 | return -EACCES; | |
1319 | ||
1320 | if (!s->busy) | |
1321 | return 0; | |
1322 | ||
1323 | if (s->busy != file) | |
1324 | return -EBUSY; | |
1325 | ||
1326 | return do_cancel(dev, s); | |
1327 | } | |
1328 | ||
1329 | /* | |
1330 | COMEDI_POLL ioctl | |
1331 | instructs driver to synchronize buffers | |
1332 | ||
1333 | arg: | |
1334 | subdevice number | |
1335 | ||
1336 | reads: | |
1337 | nothing | |
1338 | ||
1339 | writes: | |
1340 | nothing | |
1341 | ||
1342 | */ | |
476b8477 | 1343 | static int do_poll_ioctl(comedi_device *dev, unsigned int arg, void *file) |
ed9eccbe DS |
1344 | { |
1345 | comedi_subdevice *s; | |
1346 | ||
1347 | if (arg >= dev->n_subdevices) | |
1348 | return -EINVAL; | |
1349 | s = dev->subdevices + arg; | |
1350 | ||
1351 | if (s->lock && s->lock != file) | |
1352 | return -EACCES; | |
1353 | ||
1354 | if (!s->busy) | |
1355 | return 0; | |
1356 | ||
1357 | if (s->busy != file) | |
1358 | return -EBUSY; | |
1359 | ||
1360 | if (s->poll) | |
1361 | return s->poll(dev, s); | |
1362 | ||
1363 | return -EINVAL; | |
1364 | } | |
1365 | ||
476b8477 | 1366 | static int do_cancel(comedi_device *dev, comedi_subdevice *s) |
ed9eccbe DS |
1367 | { |
1368 | int ret = 0; | |
1369 | ||
1370 | if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) && s->cancel) | |
1371 | ret = s->cancel(dev, s); | |
1372 | ||
1373 | do_become_nonbusy(dev, s); | |
1374 | ||
1375 | return ret; | |
1376 | } | |
1377 | ||
1378 | void comedi_unmap(struct vm_area_struct *area) | |
1379 | { | |
1380 | comedi_async *async; | |
1381 | comedi_device *dev; | |
1382 | ||
1383 | async = area->vm_private_data; | |
1384 | dev = async->subdevice->device; | |
1385 | ||
1386 | mutex_lock(&dev->mutex); | |
1387 | async->mmap_count--; | |
1388 | mutex_unlock(&dev->mutex); | |
1389 | } | |
1390 | ||
1391 | static struct vm_operations_struct comedi_vm_ops = { | |
476b8477 | 1392 | .close = comedi_unmap, |
ed9eccbe DS |
1393 | }; |
1394 | ||
1395 | static int comedi_mmap(struct file *file, struct vm_area_struct *vma) | |
1396 | { | |
1397 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
476b8477 GKH |
1398 | struct comedi_device_file_info *dev_file_info = |
1399 | comedi_get_device_file_info(minor); | |
ed9eccbe DS |
1400 | comedi_device *dev = dev_file_info->device; |
1401 | comedi_async *async = NULL; | |
1402 | unsigned long start = vma->vm_start; | |
1403 | unsigned long size; | |
1404 | int n_pages; | |
1405 | int i; | |
1406 | int retval; | |
1407 | comedi_subdevice *s; | |
1408 | ||
1409 | mutex_lock(&dev->mutex); | |
1410 | if (!dev->attached) { | |
1411 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
1412 | retval = -ENODEV; | |
1413 | goto done; | |
1414 | } | |
476b8477 | 1415 | if (vma->vm_flags & VM_WRITE) |
ed9eccbe | 1416 | s = comedi_get_write_subdevice(dev_file_info); |
476b8477 | 1417 | else |
ed9eccbe | 1418 | s = comedi_get_read_subdevice(dev_file_info); |
476b8477 | 1419 | |
ed9eccbe DS |
1420 | if (s == NULL) { |
1421 | retval = -EINVAL; | |
1422 | goto done; | |
1423 | } | |
1424 | async = s->async; | |
1425 | if (async == NULL) { | |
1426 | retval = -EINVAL; | |
1427 | goto done; | |
1428 | } | |
1429 | ||
1430 | if (vma->vm_pgoff != 0) { | |
1431 | DPRINTK("comedi: mmap() offset must be 0.\n"); | |
1432 | retval = -EINVAL; | |
1433 | goto done; | |
1434 | } | |
1435 | ||
1436 | size = vma->vm_end - vma->vm_start; | |
1437 | if (size > async->prealloc_bufsz) { | |
1438 | retval = -EFAULT; | |
1439 | goto done; | |
1440 | } | |
1441 | if (size & (~PAGE_MASK)) { | |
1442 | retval = -EFAULT; | |
1443 | goto done; | |
1444 | } | |
1445 | ||
1446 | n_pages = size >> PAGE_SHIFT; | |
1447 | for (i = 0; i < n_pages; ++i) { | |
1448 | if (remap_pfn_range(vma, start, | |
476b8477 GKH |
1449 | page_to_pfn(virt_to_page(async-> |
1450 | buf_page_list[i]. | |
1451 | virt_addr)), | |
1452 | PAGE_SIZE, PAGE_SHARED)) { | |
ed9eccbe DS |
1453 | retval = -EAGAIN; |
1454 | goto done; | |
1455 | } | |
1456 | start += PAGE_SIZE; | |
1457 | } | |
1458 | ||
1459 | vma->vm_ops = &comedi_vm_ops; | |
1460 | vma->vm_private_data = async; | |
1461 | ||
1462 | async->mmap_count++; | |
1463 | ||
1464 | retval = 0; | |
476b8477 | 1465 | done: |
ed9eccbe DS |
1466 | mutex_unlock(&dev->mutex); |
1467 | return retval; | |
1468 | } | |
1469 | ||
476b8477 | 1470 | static unsigned int comedi_poll(struct file *file, poll_table *wait) |
ed9eccbe DS |
1471 | { |
1472 | unsigned int mask = 0; | |
1473 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
476b8477 GKH |
1474 | struct comedi_device_file_info *dev_file_info = |
1475 | comedi_get_device_file_info(minor); | |
ed9eccbe DS |
1476 | comedi_device *dev = dev_file_info->device; |
1477 | comedi_subdevice *read_subdev; | |
1478 | comedi_subdevice *write_subdev; | |
1479 | ||
1480 | mutex_lock(&dev->mutex); | |
1481 | if (!dev->attached) { | |
1482 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
1483 | mutex_unlock(&dev->mutex); | |
1484 | return 0; | |
1485 | } | |
1486 | ||
1487 | mask = 0; | |
1488 | read_subdev = comedi_get_read_subdevice(dev_file_info); | |
1489 | if (read_subdev) { | |
1490 | poll_wait(file, &read_subdev->async->wait_head, wait); | |
1491 | if (!read_subdev->busy | |
476b8477 GKH |
1492 | || comedi_buf_read_n_available(read_subdev->async) > 0 |
1493 | || !(comedi_get_subdevice_runflags(read_subdev) & | |
1494 | SRF_RUNNING)) { | |
ed9eccbe DS |
1495 | mask |= POLLIN | POLLRDNORM; |
1496 | } | |
1497 | } | |
1498 | write_subdev = comedi_get_write_subdevice(dev_file_info); | |
1499 | if (write_subdev) { | |
1500 | poll_wait(file, &write_subdev->async->wait_head, wait); | |
476b8477 GKH |
1501 | comedi_buf_write_alloc(write_subdev->async, |
1502 | write_subdev->async->prealloc_bufsz); | |
ed9eccbe | 1503 | if (!write_subdev->busy |
476b8477 GKH |
1504 | || !(comedi_get_subdevice_runflags(write_subdev) & |
1505 | SRF_RUNNING) | |
1506 | || comedi_buf_write_n_allocated(write_subdev->async) >= | |
1507 | bytes_per_sample(write_subdev->async->subdevice)) { | |
ed9eccbe DS |
1508 | mask |= POLLOUT | POLLWRNORM; |
1509 | } | |
1510 | } | |
1511 | ||
1512 | mutex_unlock(&dev->mutex); | |
1513 | return mask; | |
1514 | } | |
1515 | ||
1516 | static ssize_t comedi_write(struct file *file, const char *buf, size_t nbytes, | |
476b8477 | 1517 | loff_t *offset) |
ed9eccbe DS |
1518 | { |
1519 | comedi_subdevice *s; | |
1520 | comedi_async *async; | |
1521 | int n, m, count = 0, retval = 0; | |
1522 | DECLARE_WAITQUEUE(wait, current); | |
1523 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
476b8477 GKH |
1524 | struct comedi_device_file_info *dev_file_info = |
1525 | comedi_get_device_file_info(minor); | |
ed9eccbe DS |
1526 | comedi_device *dev = dev_file_info->device; |
1527 | ||
1528 | if (!dev->attached) { | |
1529 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
1530 | retval = -ENODEV; | |
1531 | goto done; | |
1532 | } | |
1533 | ||
1534 | s = comedi_get_write_subdevice(dev_file_info); | |
1535 | if (s == NULL) { | |
1536 | retval = -EIO; | |
1537 | goto done; | |
1538 | } | |
1539 | async = s->async; | |
1540 | ||
1541 | if (!nbytes) { | |
1542 | retval = 0; | |
1543 | goto done; | |
1544 | } | |
1545 | if (!s->busy) { | |
1546 | retval = 0; | |
1547 | goto done; | |
1548 | } | |
1549 | if (s->busy != file) { | |
1550 | retval = -EACCES; | |
1551 | goto done; | |
1552 | } | |
1553 | add_wait_queue(&async->wait_head, &wait); | |
1554 | while (nbytes > 0 && !retval) { | |
1555 | set_current_state(TASK_INTERRUPTIBLE); | |
1556 | ||
1557 | n = nbytes; | |
1558 | ||
1559 | m = n; | |
476b8477 | 1560 | if (async->buf_write_ptr + m > async->prealloc_bufsz) |
ed9eccbe | 1561 | m = async->prealloc_bufsz - async->buf_write_ptr; |
ed9eccbe | 1562 | comedi_buf_write_alloc(async, async->prealloc_bufsz); |
476b8477 | 1563 | if (m > comedi_buf_write_n_allocated(async)) |
ed9eccbe | 1564 | m = comedi_buf_write_n_allocated(async); |
ed9eccbe DS |
1565 | if (m < n) |
1566 | n = m; | |
1567 | ||
1568 | if (n == 0) { | |
1569 | if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) { | |
1570 | if (comedi_get_subdevice_runflags(s) & | |
476b8477 | 1571 | SRF_ERROR) { |
ed9eccbe DS |
1572 | retval = -EPIPE; |
1573 | } else { | |
1574 | retval = 0; | |
1575 | } | |
1576 | do_become_nonbusy(dev, s); | |
1577 | break; | |
1578 | } | |
1579 | if (file->f_flags & O_NONBLOCK) { | |
1580 | retval = -EAGAIN; | |
1581 | break; | |
1582 | } | |
1583 | if (signal_pending(current)) { | |
1584 | retval = -ERESTARTSYS; | |
1585 | break; | |
1586 | } | |
1587 | schedule(); | |
476b8477 | 1588 | if (!s->busy) |
ed9eccbe | 1589 | break; |
ed9eccbe DS |
1590 | if (s->busy != file) { |
1591 | retval = -EACCES; | |
1592 | break; | |
1593 | } | |
1594 | continue; | |
1595 | } | |
1596 | ||
1597 | m = copy_from_user(async->prealloc_buf + async->buf_write_ptr, | |
476b8477 | 1598 | buf, n); |
ed9eccbe DS |
1599 | if (m) { |
1600 | n -= m; | |
1601 | retval = -EFAULT; | |
1602 | } | |
1603 | comedi_buf_write_free(async, n); | |
1604 | ||
1605 | count += n; | |
1606 | nbytes -= n; | |
1607 | ||
1608 | buf += n; | |
1609 | break; /* makes device work like a pipe */ | |
1610 | } | |
1611 | set_current_state(TASK_RUNNING); | |
1612 | remove_wait_queue(&async->wait_head, &wait); | |
1613 | ||
1614 | done: | |
476b8477 | 1615 | return count ? count : retval; |
ed9eccbe DS |
1616 | } |
1617 | ||
1618 | static ssize_t comedi_read(struct file *file, char *buf, size_t nbytes, | |
476b8477 | 1619 | loff_t *offset) |
ed9eccbe DS |
1620 | { |
1621 | comedi_subdevice *s; | |
1622 | comedi_async *async; | |
1623 | int n, m, count = 0, retval = 0; | |
1624 | DECLARE_WAITQUEUE(wait, current); | |
1625 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
476b8477 GKH |
1626 | struct comedi_device_file_info *dev_file_info = |
1627 | comedi_get_device_file_info(minor); | |
ed9eccbe DS |
1628 | comedi_device *dev = dev_file_info->device; |
1629 | ||
1630 | if (!dev->attached) { | |
1631 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
1632 | retval = -ENODEV; | |
1633 | goto done; | |
1634 | } | |
1635 | ||
1636 | s = comedi_get_read_subdevice(dev_file_info); | |
1637 | if (s == NULL) { | |
1638 | retval = -EIO; | |
1639 | goto done; | |
1640 | } | |
1641 | async = s->async; | |
1642 | if (!nbytes) { | |
1643 | retval = 0; | |
1644 | goto done; | |
1645 | } | |
1646 | if (!s->busy) { | |
1647 | retval = 0; | |
1648 | goto done; | |
1649 | } | |
1650 | if (s->busy != file) { | |
1651 | retval = -EACCES; | |
1652 | goto done; | |
1653 | } | |
1654 | ||
1655 | add_wait_queue(&async->wait_head, &wait); | |
1656 | while (nbytes > 0 && !retval) { | |
1657 | set_current_state(TASK_INTERRUPTIBLE); | |
1658 | ||
1659 | n = nbytes; | |
1660 | ||
1661 | m = comedi_buf_read_n_available(async); | |
476b8477 GKH |
1662 | /* printk("%d available\n",m); */ |
1663 | if (async->buf_read_ptr + m > async->prealloc_bufsz) | |
ed9eccbe | 1664 | m = async->prealloc_bufsz - async->buf_read_ptr; |
476b8477 | 1665 | /* printk("%d contiguous\n",m); */ |
ed9eccbe DS |
1666 | if (m < n) |
1667 | n = m; | |
1668 | ||
1669 | if (n == 0) { | |
1670 | if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) { | |
1671 | do_become_nonbusy(dev, s); | |
1672 | if (comedi_get_subdevice_runflags(s) & | |
476b8477 | 1673 | SRF_ERROR) { |
ed9eccbe DS |
1674 | retval = -EPIPE; |
1675 | } else { | |
1676 | retval = 0; | |
1677 | } | |
1678 | break; | |
1679 | } | |
1680 | if (file->f_flags & O_NONBLOCK) { | |
1681 | retval = -EAGAIN; | |
1682 | break; | |
1683 | } | |
1684 | if (signal_pending(current)) { | |
1685 | retval = -ERESTARTSYS; | |
1686 | break; | |
1687 | } | |
1688 | schedule(); | |
1689 | if (!s->busy) { | |
1690 | retval = 0; | |
1691 | break; | |
1692 | } | |
1693 | if (s->busy != file) { | |
1694 | retval = -EACCES; | |
1695 | break; | |
1696 | } | |
1697 | continue; | |
1698 | } | |
1699 | m = copy_to_user(buf, async->prealloc_buf + | |
476b8477 | 1700 | async->buf_read_ptr, n); |
ed9eccbe DS |
1701 | if (m) { |
1702 | n -= m; | |
1703 | retval = -EFAULT; | |
1704 | } | |
1705 | ||
1706 | comedi_buf_read_alloc(async, n); | |
1707 | comedi_buf_read_free(async, n); | |
1708 | ||
1709 | count += n; | |
1710 | nbytes -= n; | |
1711 | ||
1712 | buf += n; | |
1713 | break; /* makes device work like a pipe */ | |
1714 | } | |
1715 | if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | SRF_RUNNING)) && | |
476b8477 | 1716 | async->buf_read_count - async->buf_write_count == 0) { |
ed9eccbe DS |
1717 | do_become_nonbusy(dev, s); |
1718 | } | |
1719 | set_current_state(TASK_RUNNING); | |
1720 | remove_wait_queue(&async->wait_head, &wait); | |
1721 | ||
1722 | done: | |
476b8477 | 1723 | return count ? count : retval; |
ed9eccbe DS |
1724 | } |
1725 | ||
1726 | /* | |
1727 | This function restores a subdevice to an idle state. | |
1728 | */ | |
476b8477 | 1729 | void do_become_nonbusy(comedi_device *dev, comedi_subdevice *s) |
ed9eccbe DS |
1730 | { |
1731 | comedi_async *async = s->async; | |
1732 | ||
1733 | comedi_set_subdevice_runflags(s, SRF_RUNNING, 0); | |
1734 | #ifdef CONFIG_COMEDI_RT | |
1735 | if (comedi_get_subdevice_runflags(s) & SRF_RT) { | |
1736 | comedi_switch_to_non_rt(dev); | |
1737 | comedi_set_subdevice_runflags(s, SRF_RT, 0); | |
1738 | } | |
1739 | #endif | |
1740 | if (async) { | |
1741 | comedi_reset_async_buf(async); | |
1742 | async->inttrig = NULL; | |
1743 | } else { | |
476b8477 GKH |
1744 | printk(KERN_ERR |
1745 | "BUG: (?) do_become_nonbusy called with async=0\n"); | |
ed9eccbe DS |
1746 | } |
1747 | ||
1748 | s->busy = NULL; | |
1749 | } | |
1750 | ||
1751 | static int comedi_open(struct inode *inode, struct file *file) | |
1752 | { | |
1753 | char mod[32]; | |
1754 | const unsigned minor = iminor(inode); | |
476b8477 GKH |
1755 | struct comedi_device_file_info *dev_file_info = |
1756 | comedi_get_device_file_info(minor); | |
ed9eccbe DS |
1757 | comedi_device *dev = dev_file_info->device; |
1758 | if (dev == NULL) { | |
1759 | DPRINTK("invalid minor number\n"); | |
1760 | return -ENODEV; | |
1761 | } | |
1762 | ||
1763 | /* This is slightly hacky, but we want module autoloading | |
1764 | * to work for root. | |
1765 | * case: user opens device, attached -> ok | |
1766 | * case: user opens device, unattached, in_request_module=0 -> autoload | |
1767 | * case: user opens device, unattached, in_request_module=1 -> fail | |
1768 | * case: root opens device, attached -> ok | |
1769 | * case: root opens device, unattached, in_request_module=1 -> ok | |
1770 | * (typically called from modprobe) | |
1771 | * case: root opens device, unattached, in_request_module=0 -> autoload | |
1772 | * | |
1773 | * The last could be changed to "-> ok", which would deny root | |
1774 | * autoloading. | |
1775 | */ | |
1776 | mutex_lock(&dev->mutex); | |
1777 | if (dev->attached) | |
1778 | goto ok; | |
1779 | if (!capable(CAP_SYS_MODULE) && dev->in_request_module) { | |
1780 | DPRINTK("in request module\n"); | |
1781 | mutex_unlock(&dev->mutex); | |
1782 | return -ENODEV; | |
1783 | } | |
1784 | if (capable(CAP_SYS_MODULE) && dev->in_request_module) | |
1785 | goto ok; | |
1786 | ||
1787 | dev->in_request_module = 1; | |
1788 | ||
1789 | sprintf(mod, "char-major-%i-%i", COMEDI_MAJOR, dev->minor); | |
1790 | #ifdef CONFIG_KMOD | |
1791 | mutex_unlock(&dev->mutex); | |
1792 | request_module(mod); | |
1793 | mutex_lock(&dev->mutex); | |
1794 | #endif | |
1795 | ||
1796 | dev->in_request_module = 0; | |
1797 | ||
1798 | if (!dev->attached && !capable(CAP_SYS_MODULE)) { | |
1799 | DPRINTK("not attached and not CAP_SYS_MODULE\n"); | |
1800 | mutex_unlock(&dev->mutex); | |
1801 | return -ENODEV; | |
1802 | } | |
1803 | ok: | |
1804 | __module_get(THIS_MODULE); | |
1805 | ||
1806 | if (dev->attached) { | |
1807 | if (!try_module_get(dev->driver->module)) { | |
1808 | module_put(THIS_MODULE); | |
1809 | mutex_unlock(&dev->mutex); | |
1810 | return -ENOSYS; | |
1811 | } | |
1812 | } | |
1813 | ||
476b8477 | 1814 | if (dev->attached && dev->use_count == 0 && dev->open) |
ed9eccbe | 1815 | dev->open(dev); |
ed9eccbe DS |
1816 | |
1817 | dev->use_count++; | |
1818 | ||
1819 | mutex_unlock(&dev->mutex); | |
1820 | ||
1821 | return 0; | |
1822 | } | |
1823 | ||
1824 | static int comedi_close(struct inode *inode, struct file *file) | |
1825 | { | |
1826 | const unsigned minor = iminor(inode); | |
476b8477 GKH |
1827 | struct comedi_device_file_info *dev_file_info = |
1828 | comedi_get_device_file_info(minor); | |
ed9eccbe DS |
1829 | comedi_device *dev = dev_file_info->device; |
1830 | comedi_subdevice *s = NULL; | |
1831 | int i; | |
1832 | ||
1833 | mutex_lock(&dev->mutex); | |
1834 | ||
1835 | if (dev->subdevices) { | |
1836 | for (i = 0; i < dev->n_subdevices; i++) { | |
1837 | s = dev->subdevices + i; | |
1838 | ||
476b8477 | 1839 | if (s->busy == file) |
ed9eccbe | 1840 | do_cancel(dev, s); |
476b8477 | 1841 | if (s->lock == file) |
ed9eccbe | 1842 | s->lock = NULL; |
ed9eccbe DS |
1843 | } |
1844 | } | |
476b8477 | 1845 | if (dev->attached && dev->use_count == 1 && dev->close) |
ed9eccbe | 1846 | dev->close(dev); |
ed9eccbe DS |
1847 | |
1848 | module_put(THIS_MODULE); | |
476b8477 | 1849 | if (dev->attached) |
ed9eccbe | 1850 | module_put(dev->driver->module); |
ed9eccbe DS |
1851 | |
1852 | dev->use_count--; | |
1853 | ||
1854 | mutex_unlock(&dev->mutex); | |
1855 | ||
476b8477 | 1856 | if (file->f_flags & FASYNC) |
ed9eccbe | 1857 | comedi_fasync(-1, file, 0); |
ed9eccbe DS |
1858 | |
1859 | return 0; | |
1860 | } | |
1861 | ||
1862 | static int comedi_fasync(int fd, struct file *file, int on) | |
1863 | { | |
1864 | const unsigned minor = iminor(file->f_dentry->d_inode); | |
476b8477 GKH |
1865 | struct comedi_device_file_info *dev_file_info = |
1866 | comedi_get_device_file_info(minor); | |
1867 | ||
ed9eccbe DS |
1868 | comedi_device *dev = dev_file_info->device; |
1869 | ||
1870 | return fasync_helper(fd, file, on, &dev->async_queue); | |
1871 | } | |
1872 | ||
1873 | const struct file_operations comedi_fops = { | |
476b8477 | 1874 | .owner = THIS_MODULE, |
ed9eccbe | 1875 | #ifdef HAVE_UNLOCKED_IOCTL |
476b8477 | 1876 | .unlocked_ioctl = comedi_unlocked_ioctl, |
ed9eccbe | 1877 | #else |
476b8477 | 1878 | .ioctl = comedi_ioctl, |
ed9eccbe DS |
1879 | #endif |
1880 | #ifdef HAVE_COMPAT_IOCTL | |
476b8477 | 1881 | .compat_ioctl = comedi_compat_ioctl, |
ed9eccbe | 1882 | #endif |
476b8477 GKH |
1883 | .open = comedi_open, |
1884 | .release = comedi_close, | |
1885 | .read = comedi_read, | |
1886 | .write = comedi_write, | |
1887 | .mmap = comedi_mmap, | |
1888 | .poll = comedi_poll, | |
1889 | .fasync = comedi_fasync, | |
ed9eccbe DS |
1890 | }; |
1891 | ||
476b8477 | 1892 | struct class *comedi_class; |
ed9eccbe DS |
1893 | static struct cdev comedi_cdev; |
1894 | ||
1895 | static void comedi_cleanup_legacy_minors(void) | |
1896 | { | |
1897 | unsigned i; | |
476b8477 GKH |
1898 | |
1899 | for (i = 0; i < COMEDI_NUM_LEGACY_MINORS; i++) | |
ed9eccbe | 1900 | comedi_free_board_minor(i); |
ed9eccbe DS |
1901 | } |
1902 | ||
1903 | static int __init comedi_init(void) | |
1904 | { | |
1905 | int i; | |
1906 | int retval; | |
1907 | ||
476b8477 GKH |
1908 | printk(KERN_INFO "comedi: version " COMEDI_RELEASE |
1909 | " - http://www.comedi.org\n"); | |
ed9eccbe | 1910 | |
476b8477 GKH |
1911 | memset(comedi_file_info_table, 0, |
1912 | sizeof(struct comedi_device_file_info *) * COMEDI_NUM_MINORS); | |
ed9eccbe DS |
1913 | |
1914 | retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
476b8477 | 1915 | COMEDI_NUM_MINORS, "comedi"); |
ed9eccbe DS |
1916 | if (retval) |
1917 | return -EIO; | |
1918 | cdev_init(&comedi_cdev, &comedi_fops); | |
1919 | comedi_cdev.owner = THIS_MODULE; | |
1920 | kobject_set_name(&comedi_cdev.kobj, "comedi"); | |
1921 | if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) { | |
1922 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
476b8477 | 1923 | COMEDI_NUM_MINORS); |
ed9eccbe DS |
1924 | return -EIO; |
1925 | } | |
1926 | comedi_class = class_create(THIS_MODULE, "comedi"); | |
1927 | if (IS_ERR(comedi_class)) { | |
1928 | printk("comedi: failed to create class"); | |
1929 | cdev_del(&comedi_cdev); | |
1930 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
476b8477 | 1931 | COMEDI_NUM_MINORS); |
ed9eccbe DS |
1932 | return PTR_ERR(comedi_class); |
1933 | } | |
1934 | ||
1935 | /* XXX requires /proc interface */ | |
1936 | comedi_proc_init(); | |
1937 | ||
476b8477 | 1938 | /* create devices files for legacy/manual use */ |
ed9eccbe DS |
1939 | for (i = 0; i < COMEDI_NUM_LEGACY_MINORS; i++) { |
1940 | int minor; | |
1941 | minor = comedi_alloc_board_minor(NULL); | |
476b8477 | 1942 | if (minor < 0) { |
ed9eccbe DS |
1943 | comedi_cleanup_legacy_minors(); |
1944 | cdev_del(&comedi_cdev); | |
1945 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
476b8477 | 1946 | COMEDI_NUM_MINORS); |
ed9eccbe DS |
1947 | return minor; |
1948 | } | |
1949 | } | |
1950 | ||
1951 | comedi_rt_init(); | |
1952 | ||
1953 | comedi_register_ioctl32(); | |
1954 | ||
1955 | return 0; | |
1956 | } | |
1957 | ||
1958 | static void __exit comedi_cleanup(void) | |
1959 | { | |
1960 | int i; | |
1961 | ||
1962 | comedi_cleanup_legacy_minors(); | |
476b8477 | 1963 | for (i = 0; i < COMEDI_NUM_MINORS; ++i) |
ed9eccbe | 1964 | BUG_ON(comedi_file_info_table[i]); |
476b8477 | 1965 | |
ed9eccbe DS |
1966 | |
1967 | class_destroy(comedi_class); | |
1968 | cdev_del(&comedi_cdev); | |
1969 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS); | |
1970 | ||
1971 | comedi_proc_cleanup(); | |
1972 | ||
1973 | comedi_rt_cleanup(); | |
1974 | ||
1975 | comedi_unregister_ioctl32(); | |
1976 | } | |
1977 | ||
1978 | module_init(comedi_init); | |
1979 | module_exit(comedi_cleanup); | |
1980 | ||
476b8477 | 1981 | void comedi_error(const comedi_device *dev, const char *s) |
ed9eccbe DS |
1982 | { |
1983 | rt_printk("comedi%d: %s: %s\n", dev->minor, dev->driver->driver_name, | |
476b8477 | 1984 | s); |
ed9eccbe DS |
1985 | } |
1986 | ||
476b8477 | 1987 | void comedi_event(comedi_device *dev, comedi_subdevice *s) |
ed9eccbe DS |
1988 | { |
1989 | comedi_async *async = s->async; | |
1990 | unsigned runflags = 0; | |
1991 | unsigned runflags_mask = 0; | |
1992 | ||
476b8477 | 1993 | /* DPRINTK("comedi_event 0x%x\n",mask); */ |
ed9eccbe DS |
1994 | |
1995 | if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) == 0) | |
1996 | return; | |
1997 | ||
1998 | if (s->async-> | |
476b8477 | 1999 | events & (COMEDI_CB_EOA | COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) { |
ed9eccbe DS |
2000 | runflags_mask |= SRF_RUNNING; |
2001 | } | |
2002 | /* remember if an error event has occured, so an error | |
2003 | * can be returned the next time the user does a read() */ | |
2004 | if (s->async->events & (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) { | |
2005 | runflags_mask |= SRF_ERROR; | |
2006 | runflags |= SRF_ERROR; | |
2007 | } | |
2008 | if (runflags_mask) { | |
2009 | /*sets SRF_ERROR and SRF_RUNNING together atomically */ | |
2010 | comedi_set_subdevice_runflags(s, runflags_mask, runflags); | |
2011 | } | |
2012 | ||
2013 | if (async->cb_mask & s->async->events) { | |
2014 | if (comedi_get_subdevice_runflags(s) & SRF_USER) { | |
2015 | ||
2016 | if (dev->rt) { | |
2017 | #ifdef CONFIG_COMEDI_RT | |
476b8477 | 2018 | /* pend wake up */ |
ed9eccbe DS |
2019 | comedi_rt_pend_wakeup(&async->wait_head); |
2020 | #else | |
476b8477 GKH |
2021 | printk |
2022 | ("BUG: comedi_event() code unreachable\n"); | |
ed9eccbe DS |
2023 | #endif |
2024 | } else { | |
2025 | wake_up_interruptible(&async->wait_head); | |
2026 | if (s->subdev_flags & SDF_CMD_READ) { | |
2027 | kill_fasync(&dev->async_queue, SIGIO, | |
476b8477 | 2028 | POLL_IN); |
ed9eccbe DS |
2029 | } |
2030 | if (s->subdev_flags & SDF_CMD_WRITE) { | |
2031 | kill_fasync(&dev->async_queue, SIGIO, | |
476b8477 | 2032 | POLL_OUT); |
ed9eccbe DS |
2033 | } |
2034 | } | |
2035 | } else { | |
2036 | if (async->cb_func) | |
2037 | async->cb_func(s->async->events, async->cb_arg); | |
2038 | /* XXX bug here. If subdevice A is rt, and | |
2039 | * subdevice B tries to callback to a normal | |
2040 | * linux kernel function, it will be at the | |
2041 | * wrong priority. Since this isn't very | |
2042 | * common, I'm not going to worry about it. */ | |
2043 | } | |
2044 | } | |
2045 | s->async->events = 0; | |
2046 | } | |
2047 | ||
476b8477 GKH |
2048 | void comedi_set_subdevice_runflags(comedi_subdevice *s, unsigned mask, |
2049 | unsigned bits) | |
ed9eccbe DS |
2050 | { |
2051 | unsigned long flags; | |
2052 | ||
2053 | comedi_spin_lock_irqsave(&s->spin_lock, flags); | |
2054 | s->runflags &= ~mask; | |
2055 | s->runflags |= (bits & mask); | |
2056 | comedi_spin_unlock_irqrestore(&s->spin_lock, flags); | |
2057 | } | |
2058 | ||
476b8477 | 2059 | unsigned comedi_get_subdevice_runflags(comedi_subdevice *s) |
ed9eccbe DS |
2060 | { |
2061 | unsigned long flags; | |
2062 | unsigned runflags; | |
2063 | ||
2064 | comedi_spin_lock_irqsave(&s->spin_lock, flags); | |
2065 | runflags = s->runflags; | |
2066 | comedi_spin_unlock_irqrestore(&s->spin_lock, flags); | |
2067 | return runflags; | |
2068 | } | |
2069 | ||
476b8477 | 2070 | static int is_device_busy(comedi_device *dev) |
ed9eccbe DS |
2071 | { |
2072 | comedi_subdevice *s; | |
2073 | int i; | |
2074 | ||
2075 | if (!dev->attached) | |
2076 | return 0; | |
2077 | ||
2078 | for (i = 0; i < dev->n_subdevices; i++) { | |
2079 | s = dev->subdevices + i; | |
2080 | if (s->busy) | |
2081 | return 1; | |
2082 | if (s->async && s->async->mmap_count) | |
2083 | return 1; | |
2084 | } | |
2085 | ||
2086 | return 0; | |
2087 | } | |
2088 | ||
2089 | void comedi_device_init(comedi_device *dev) | |
2090 | { | |
2091 | memset(dev, 0, sizeof(comedi_device)); | |
2092 | spin_lock_init(&dev->spinlock); | |
2093 | mutex_init(&dev->mutex); | |
2094 | dev->minor = -1; | |
2095 | } | |
2096 | ||
2097 | void comedi_device_cleanup(comedi_device *dev) | |
2098 | { | |
476b8477 GKH |
2099 | if (dev == NULL) |
2100 | return; | |
ed9eccbe DS |
2101 | mutex_lock(&dev->mutex); |
2102 | comedi_device_detach(dev); | |
2103 | mutex_unlock(&dev->mutex); | |
2104 | mutex_destroy(&dev->mutex); | |
2105 | } | |
2106 | ||
2107 | int comedi_alloc_board_minor(struct device *hardware_device) | |
2108 | { | |
2109 | unsigned long flags; | |
2110 | struct comedi_device_file_info *info; | |
2111 | device_create_result_type *csdev; | |
2112 | unsigned i; | |
2113 | ||
2114 | info = kzalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL); | |
476b8477 GKH |
2115 | if (info == NULL) |
2116 | return -ENOMEM; | |
ed9eccbe | 2117 | info->device = kzalloc(sizeof(comedi_device), GFP_KERNEL); |
476b8477 | 2118 | if (info->device == NULL) { |
ed9eccbe DS |
2119 | kfree(info); |
2120 | return -ENOMEM; | |
2121 | } | |
2122 | comedi_device_init(info->device); | |
2123 | comedi_spin_lock_irqsave(&comedi_file_info_table_lock, flags); | |
476b8477 GKH |
2124 | for (i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i) { |
2125 | if (comedi_file_info_table[i] == NULL) { | |
ed9eccbe DS |
2126 | comedi_file_info_table[i] = info; |
2127 | break; | |
2128 | } | |
2129 | } | |
2130 | comedi_spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); | |
476b8477 | 2131 | if (i == COMEDI_NUM_BOARD_MINORS) { |
ed9eccbe DS |
2132 | comedi_device_cleanup(info->device); |
2133 | kfree(info->device); | |
2134 | kfree(info); | |
476b8477 GKH |
2135 | rt_printk |
2136 | ("comedi: error: ran out of minor numbers for board device files.\n"); | |
ed9eccbe DS |
2137 | return -EBUSY; |
2138 | } | |
2139 | info->device->minor = i; | |
2140 | csdev = COMEDI_DEVICE_CREATE(comedi_class, NULL, | |
476b8477 GKH |
2141 | MKDEV(COMEDI_MAJOR, i), NULL, |
2142 | hardware_device, "comedi%i", i); | |
2143 | if (!IS_ERR(csdev)) | |
ed9eccbe | 2144 | info->device->class_dev = csdev; |
476b8477 | 2145 | |
ed9eccbe DS |
2146 | return i; |
2147 | } | |
2148 | ||
2149 | void comedi_free_board_minor(unsigned minor) | |
2150 | { | |
2151 | unsigned long flags; | |
2152 | struct comedi_device_file_info *info; | |
2153 | ||
2154 | BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS); | |
2155 | comedi_spin_lock_irqsave(&comedi_file_info_table_lock, flags); | |
2156 | info = comedi_file_info_table[minor]; | |
2157 | comedi_file_info_table[minor] = NULL; | |
2158 | comedi_spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); | |
2159 | ||
476b8477 | 2160 | if (info) { |
ed9eccbe | 2161 | comedi_device *dev = info->device; |
476b8477 GKH |
2162 | if (dev) { |
2163 | if (dev->class_dev) { | |
2164 | device_destroy(comedi_class, | |
2165 | MKDEV(COMEDI_MAJOR, dev->minor)); | |
ed9eccbe DS |
2166 | } |
2167 | comedi_device_cleanup(dev); | |
2168 | kfree(dev); | |
2169 | } | |
2170 | kfree(info); | |
2171 | } | |
2172 | } | |
2173 | ||
2174 | int comedi_alloc_subdevice_minor(comedi_device *dev, comedi_subdevice *s) | |
2175 | { | |
2176 | unsigned long flags; | |
2177 | struct comedi_device_file_info *info; | |
2178 | device_create_result_type *csdev; | |
2179 | unsigned i; | |
2180 | ||
2181 | info = kmalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL); | |
476b8477 GKH |
2182 | if (info == NULL) |
2183 | return -ENOMEM; | |
ed9eccbe DS |
2184 | info->device = dev; |
2185 | info->read_subdevice = s; | |
2186 | info->write_subdevice = s; | |
2187 | comedi_spin_lock_irqsave(&comedi_file_info_table_lock, flags); | |
476b8477 GKH |
2188 | for (i = COMEDI_FIRST_SUBDEVICE_MINOR; i < COMEDI_NUM_BOARD_MINORS; ++i) { |
2189 | if (comedi_file_info_table[i] == NULL) { | |
ed9eccbe DS |
2190 | comedi_file_info_table[i] = info; |
2191 | break; | |
2192 | } | |
2193 | } | |
2194 | comedi_spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); | |
476b8477 | 2195 | if (i == COMEDI_NUM_MINORS) { |
ed9eccbe | 2196 | kfree(info); |
476b8477 GKH |
2197 | rt_printk |
2198 | ("comedi: error: ran out of minor numbers for board device files.\n"); | |
ed9eccbe DS |
2199 | return -EBUSY; |
2200 | } | |
2201 | s->minor = i; | |
2202 | csdev = COMEDI_DEVICE_CREATE(comedi_class, dev->class_dev, | |
476b8477 GKH |
2203 | MKDEV(COMEDI_MAJOR, i), NULL, NULL, |
2204 | "comedi%i_subd%i", dev->minor, | |
2205 | (int)(s - dev->subdevices)); | |
2206 | if (!IS_ERR(csdev)) | |
ed9eccbe | 2207 | s->class_dev = csdev; |
476b8477 | 2208 | |
ed9eccbe DS |
2209 | return i; |
2210 | } | |
2211 | ||
2212 | void comedi_free_subdevice_minor(comedi_subdevice *s) | |
2213 | { | |
2214 | unsigned long flags; | |
2215 | struct comedi_device_file_info *info; | |
2216 | ||
476b8477 GKH |
2217 | if (s == NULL) |
2218 | return; | |
2219 | if (s->minor < 0) | |
2220 | return; | |
ed9eccbe DS |
2221 | |
2222 | BUG_ON(s->minor >= COMEDI_NUM_MINORS); | |
2223 | BUG_ON(s->minor < COMEDI_FIRST_SUBDEVICE_MINOR); | |
2224 | ||
2225 | comedi_spin_lock_irqsave(&comedi_file_info_table_lock, flags); | |
2226 | info = comedi_file_info_table[s->minor]; | |
2227 | comedi_file_info_table[s->minor] = NULL; | |
2228 | comedi_spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); | |
2229 | ||
476b8477 | 2230 | if (s->class_dev) { |
ed9eccbe DS |
2231 | device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor)); |
2232 | s->class_dev = NULL; | |
2233 | } | |
2234 | kfree(info); | |
2235 | } | |
2236 | ||
2237 | struct comedi_device_file_info *comedi_get_device_file_info(unsigned minor) | |
2238 | { | |
2239 | unsigned long flags; | |
2240 | struct comedi_device_file_info *info; | |
2241 | ||
2242 | BUG_ON(minor >= COMEDI_NUM_MINORS); | |
2243 | comedi_spin_lock_irqsave(&comedi_file_info_table_lock, flags); | |
2244 | info = comedi_file_info_table[minor]; | |
2245 | comedi_spin_unlock_irqrestore(&comedi_file_info_table_lock, flags); | |
2246 | return info; | |
2247 | } |