]>
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 | ||
ed9eccbe DS |
26 | #include "comedi_compat32.h" |
27 | ||
28 | #include <linux/module.h> | |
29 | #include <linux/errno.h> | |
30 | #include <linux/kernel.h> | |
31 | #include <linux/sched.h> | |
32 | #include <linux/fcntl.h> | |
33 | #include <linux/delay.h> | |
34 | #include <linux/ioport.h> | |
35 | #include <linux/mm.h> | |
36 | #include <linux/slab.h> | |
37 | #include <linux/kmod.h> | |
38 | #include <linux/poll.h> | |
39 | #include <linux/init.h> | |
40 | #include <linux/device.h> | |
41 | #include <linux/vmalloc.h> | |
42 | #include <linux/fs.h> | |
43 | #include "comedidev.h" | |
44 | #include <linux/cdev.h> | |
883db3d9 | 45 | #include <linux/stat.h> |
ed9eccbe | 46 | |
476b8477 GKH |
47 | #include <linux/io.h> |
48 | #include <linux/uaccess.h> | |
ed9eccbe | 49 | |
3a5fa275 | 50 | #include "comedi_internal.h" |
ed9eccbe | 51 | |
eda56825 | 52 | #define COMEDI_NUM_MINORS 0x100 |
5b7dba1b IA |
53 | #define COMEDI_NUM_SUBDEVICE_MINORS \ |
54 | (COMEDI_NUM_MINORS - COMEDI_NUM_BOARD_MINORS) | |
eda56825 | 55 | |
ed9eccbe DS |
56 | #ifdef CONFIG_COMEDI_DEBUG |
57 | int comedi_debug; | |
18736438 | 58 | EXPORT_SYMBOL(comedi_debug); |
4d7df821 IA |
59 | module_param(comedi_debug, int, S_IRUGO | S_IWUSR); |
60 | MODULE_PARM_DESC(comedi_debug, | |
61 | "enable comedi core and driver debugging if non-zero (default 0)" | |
62 | ); | |
ed9eccbe DS |
63 | #endif |
64 | ||
92d0127c | 65 | static int comedi_num_legacy_minors; |
4d7df821 IA |
66 | module_param(comedi_num_legacy_minors, int, S_IRUGO); |
67 | MODULE_PARM_DESC(comedi_num_legacy_minors, | |
68 | "number of comedi minor devices to reserve for non-auto-configured devices (default 0)" | |
69 | ); | |
70 | ||
234bb3c6 | 71 | unsigned int comedi_default_buf_size_kb = CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB; |
4d7df821 IA |
72 | module_param(comedi_default_buf_size_kb, uint, S_IRUGO | S_IWUSR); |
73 | MODULE_PARM_DESC(comedi_default_buf_size_kb, | |
74 | "default asynchronous buffer size in KiB (default " | |
234bb3c6 | 75 | __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB) ")"); |
4d7df821 | 76 | |
234bb3c6 IA |
77 | unsigned int comedi_default_buf_maxsize_kb |
78 | = CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB; | |
4d7df821 IA |
79 | module_param(comedi_default_buf_maxsize_kb, uint, S_IRUGO | S_IWUSR); |
80 | MODULE_PARM_DESC(comedi_default_buf_maxsize_kb, | |
81 | "default maximum size of asynchronous buffer in KiB (default " | |
234bb3c6 | 82 | __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB) ")"); |
1dd33ab8 | 83 | |
cd6b7636 | 84 | struct comedi_file_info { |
e79c8d21 HS |
85 | struct comedi_device *device; |
86 | struct comedi_subdevice *read_subdevice; | |
87 | struct comedi_subdevice *write_subdevice; | |
e79c8d21 HS |
88 | }; |
89 | ||
5b7dba1b IA |
90 | static DEFINE_MUTEX(comedi_board_minor_table_lock); |
91 | static struct comedi_file_info | |
92 | *comedi_board_minor_table[COMEDI_NUM_BOARD_MINORS]; | |
93 | ||
94 | static DEFINE_MUTEX(comedi_subdevice_minor_table_lock); | |
95 | /* Note: indexed by minor - COMEDI_NUM_BOARD_MINORS. */ | |
96 | static struct comedi_file_info | |
97 | *comedi_subdevice_minor_table[COMEDI_NUM_SUBDEVICE_MINORS]; | |
476b8477 | 98 | |
d9740a03 IA |
99 | static struct class *comedi_class; |
100 | static struct cdev comedi_cdev; | |
101 | ||
102 | static void comedi_device_init(struct comedi_device *dev) | |
103 | { | |
104 | spin_lock_init(&dev->spinlock); | |
105 | mutex_init(&dev->mutex); | |
106 | dev->minor = -1; | |
107 | } | |
108 | ||
109 | static void comedi_device_cleanup(struct comedi_device *dev) | |
110 | { | |
111 | struct module *driver_module = NULL; | |
112 | ||
113 | if (dev == NULL) | |
114 | return; | |
115 | mutex_lock(&dev->mutex); | |
116 | if (dev->attached) | |
117 | driver_module = dev->driver->module; | |
118 | comedi_device_detach(dev); | |
119 | while (dev->use_count > 0) { | |
120 | if (driver_module) | |
121 | module_put(driver_module); | |
122 | module_put(THIS_MODULE); | |
123 | dev->use_count--; | |
124 | } | |
125 | mutex_unlock(&dev->mutex); | |
126 | mutex_destroy(&dev->mutex); | |
127 | } | |
128 | ||
5b7dba1b | 129 | static struct comedi_file_info *comedi_clear_board_minor(unsigned minor) |
d9740a03 IA |
130 | { |
131 | struct comedi_file_info *info; | |
132 | ||
5b7dba1b IA |
133 | mutex_lock(&comedi_board_minor_table_lock); |
134 | info = comedi_board_minor_table[minor]; | |
135 | comedi_board_minor_table[minor] = NULL; | |
136 | mutex_unlock(&comedi_board_minor_table_lock); | |
d9740a03 IA |
137 | return info; |
138 | } | |
139 | ||
140 | static void comedi_free_board_file_info(struct comedi_file_info *info) | |
141 | { | |
142 | if (info) { | |
143 | struct comedi_device *dev = info->device; | |
144 | if (dev) { | |
145 | if (dev->class_dev) { | |
146 | device_destroy(comedi_class, | |
147 | MKDEV(COMEDI_MAJOR, dev->minor)); | |
148 | } | |
149 | comedi_device_cleanup(dev); | |
150 | kfree(dev); | |
151 | } | |
152 | kfree(info); | |
153 | } | |
154 | } | |
8ab4ed6e | 155 | |
5b7dba1b IA |
156 | static struct comedi_file_info |
157 | *comedi_file_info_from_board_minor(unsigned minor) | |
87b1ad7a | 158 | { |
cd6b7636 | 159 | struct comedi_file_info *info; |
87b1ad7a | 160 | |
5b7dba1b IA |
161 | BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS); |
162 | mutex_lock(&comedi_board_minor_table_lock); | |
163 | info = comedi_board_minor_table[minor]; | |
164 | mutex_unlock(&comedi_board_minor_table_lock); | |
87b1ad7a HS |
165 | return info; |
166 | } | |
167 | ||
5b7dba1b IA |
168 | static struct comedi_file_info |
169 | *comedi_file_info_from_subdevice_minor(unsigned minor) | |
170 | { | |
171 | struct comedi_file_info *info; | |
172 | unsigned int i = minor - COMEDI_NUM_BOARD_MINORS; | |
173 | ||
174 | BUG_ON(i >= COMEDI_NUM_SUBDEVICE_MINORS); | |
175 | mutex_lock(&comedi_subdevice_minor_table_lock); | |
176 | info = comedi_subdevice_minor_table[i]; | |
177 | mutex_unlock(&comedi_subdevice_minor_table_lock); | |
178 | return info; | |
179 | } | |
180 | ||
ba1bcf6f IA |
181 | static struct comedi_device * |
182 | comedi_dev_from_file_info(struct comedi_file_info *info) | |
85104e9b | 183 | { |
85104e9b HS |
184 | return info ? info->device : NULL; |
185 | } | |
ba1bcf6f | 186 | |
f3abc831 IA |
187 | static struct comedi_device *comedi_dev_from_board_minor(unsigned minor) |
188 | { | |
189 | struct comedi_file_info *info; | |
190 | ||
191 | info = comedi_file_info_from_board_minor(minor); | |
192 | return comedi_dev_from_file_info(info); | |
193 | } | |
194 | ||
195 | static struct comedi_device *comedi_dev_from_subdevice_minor(unsigned minor) | |
196 | { | |
197 | struct comedi_file_info *info; | |
198 | ||
199 | info = comedi_file_info_from_subdevice_minor(minor); | |
200 | return comedi_dev_from_file_info(info); | |
201 | } | |
202 | ||
ba1bcf6f IA |
203 | struct comedi_device *comedi_dev_from_minor(unsigned minor) |
204 | { | |
f3abc831 IA |
205 | if (minor < COMEDI_NUM_BOARD_MINORS) |
206 | return comedi_dev_from_board_minor(minor); | |
207 | else | |
208 | return comedi_dev_from_subdevice_minor(minor); | |
ba1bcf6f | 209 | } |
85104e9b HS |
210 | EXPORT_SYMBOL_GPL(comedi_dev_from_minor); |
211 | ||
43bd33f2 | 212 | static struct comedi_subdevice * |
da56fdc6 | 213 | comedi_read_subdevice(const struct comedi_device *dev, unsigned int minor) |
43bd33f2 | 214 | { |
da56fdc6 IA |
215 | struct comedi_file_info *info; |
216 | ||
217 | if (minor >= COMEDI_NUM_BOARD_MINORS) { | |
218 | info = comedi_file_info_from_subdevice_minor(minor); | |
219 | if (!info || info->device != dev) | |
220 | return NULL; | |
221 | if (info->read_subdevice) | |
222 | return info->read_subdevice; | |
223 | } | |
224 | return dev->read_subdev; | |
43bd33f2 HS |
225 | } |
226 | ||
227 | static struct comedi_subdevice * | |
da56fdc6 | 228 | comedi_write_subdevice(const struct comedi_device *dev, unsigned int minor) |
43bd33f2 | 229 | { |
da56fdc6 IA |
230 | struct comedi_file_info *info; |
231 | ||
232 | if (minor >= COMEDI_NUM_BOARD_MINORS) { | |
233 | info = comedi_file_info_from_subdevice_minor(minor); | |
234 | if (!info || info->device != dev) | |
235 | return NULL; | |
236 | if (info->write_subdevice) | |
237 | return info->write_subdevice; | |
238 | } | |
239 | return dev->write_subdev; | |
43bd33f2 HS |
240 | } |
241 | ||
883db3d9 FMH |
242 | static int resize_async_buffer(struct comedi_device *dev, |
243 | struct comedi_subdevice *s, | |
a5011a26 HS |
244 | struct comedi_async *async, unsigned new_size) |
245 | { | |
246 | int retval; | |
247 | ||
248 | if (new_size > async->max_bufsize) | |
249 | return -EPERM; | |
250 | ||
251 | if (s->busy) { | |
252 | DPRINTK("subdevice is busy, cannot resize buffer\n"); | |
253 | return -EBUSY; | |
254 | } | |
255 | if (async->mmap_count) { | |
256 | DPRINTK("subdevice is mmapped, cannot resize buffer\n"); | |
257 | return -EBUSY; | |
258 | } | |
259 | ||
260 | if (!async->prealloc_buf) | |
261 | return -EINVAL; | |
262 | ||
263 | /* make sure buffer is an integral number of pages | |
264 | * (we round up) */ | |
265 | new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK; | |
266 | ||
267 | retval = comedi_buf_alloc(dev, s, new_size); | |
268 | if (retval < 0) | |
269 | return retval; | |
270 | ||
271 | if (s->buf_change) { | |
272 | retval = s->buf_change(dev, s, new_size); | |
273 | if (retval < 0) | |
274 | return retval; | |
275 | } | |
276 | ||
277 | DPRINTK("comedi%i subd %d buffer resized to %i bytes\n", | |
90a35c15 | 278 | dev->minor, s->index, async->prealloc_bufsz); |
a5011a26 HS |
279 | return 0; |
280 | } | |
281 | ||
282 | /* sysfs attribute files */ | |
283 | ||
7a4e5a9f | 284 | static ssize_t show_max_read_buffer_kb(struct device *csdev, |
a5011a26 HS |
285 | struct device_attribute *attr, char *buf) |
286 | { | |
c88db469 | 287 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
288 | struct comedi_device *dev; |
289 | struct comedi_subdevice *s; | |
72fd9fac | 290 | unsigned int size = 0; |
a5011a26 | 291 | |
5e04c254 IA |
292 | dev = comedi_dev_from_minor(minor); |
293 | if (!dev) | |
c88db469 IA |
294 | return -ENODEV; |
295 | ||
7f4656c5 | 296 | mutex_lock(&dev->mutex); |
da56fdc6 | 297 | s = comedi_read_subdevice(dev, minor); |
72fd9fac HS |
298 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
299 | size = s->async->max_bufsize / 1024; | |
7f4656c5 | 300 | mutex_unlock(&dev->mutex); |
a5011a26 | 301 | |
72fd9fac | 302 | return snprintf(buf, PAGE_SIZE, "%i\n", size); |
a5011a26 HS |
303 | } |
304 | ||
7a4e5a9f | 305 | static ssize_t store_max_read_buffer_kb(struct device *csdev, |
a5011a26 HS |
306 | struct device_attribute *attr, |
307 | const char *buf, size_t count) | |
308 | { | |
c88db469 | 309 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
310 | struct comedi_device *dev; |
311 | struct comedi_subdevice *s; | |
72fd9fac HS |
312 | unsigned int size; |
313 | int err; | |
314 | ||
315 | err = kstrtouint(buf, 10, &size); | |
316 | if (err) | |
317 | return err; | |
318 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 319 | return -EINVAL; |
72fd9fac | 320 | size *= 1024; |
a5011a26 | 321 | |
5e04c254 IA |
322 | dev = comedi_dev_from_minor(minor); |
323 | if (!dev) | |
c88db469 IA |
324 | return -ENODEV; |
325 | ||
7f4656c5 | 326 | mutex_lock(&dev->mutex); |
da56fdc6 | 327 | s = comedi_read_subdevice(dev, minor); |
72fd9fac HS |
328 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
329 | s->async->max_bufsize = size; | |
330 | else | |
331 | err = -EINVAL; | |
7f4656c5 | 332 | mutex_unlock(&dev->mutex); |
a5011a26 | 333 | |
72fd9fac | 334 | return err ? err : count; |
a5011a26 HS |
335 | } |
336 | ||
7a4e5a9f | 337 | static ssize_t show_read_buffer_kb(struct device *csdev, |
a5011a26 HS |
338 | struct device_attribute *attr, char *buf) |
339 | { | |
c88db469 | 340 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
341 | struct comedi_device *dev; |
342 | struct comedi_subdevice *s; | |
72fd9fac | 343 | unsigned int size = 0; |
a5011a26 | 344 | |
5e04c254 IA |
345 | dev = comedi_dev_from_minor(minor); |
346 | if (!dev) | |
c88db469 IA |
347 | return -ENODEV; |
348 | ||
7f4656c5 | 349 | mutex_lock(&dev->mutex); |
da56fdc6 | 350 | s = comedi_read_subdevice(dev, minor); |
72fd9fac HS |
351 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
352 | size = s->async->prealloc_bufsz / 1024; | |
7f4656c5 | 353 | mutex_unlock(&dev->mutex); |
a5011a26 | 354 | |
72fd9fac | 355 | return snprintf(buf, PAGE_SIZE, "%i\n", size); |
a5011a26 HS |
356 | } |
357 | ||
7a4e5a9f | 358 | static ssize_t store_read_buffer_kb(struct device *csdev, |
a5011a26 HS |
359 | struct device_attribute *attr, |
360 | const char *buf, size_t count) | |
361 | { | |
c88db469 | 362 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
363 | struct comedi_device *dev; |
364 | struct comedi_subdevice *s; | |
72fd9fac HS |
365 | unsigned int size; |
366 | int err; | |
367 | ||
368 | err = kstrtouint(buf, 10, &size); | |
369 | if (err) | |
370 | return err; | |
371 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 372 | return -EINVAL; |
72fd9fac | 373 | size *= 1024; |
a5011a26 | 374 | |
5e04c254 IA |
375 | dev = comedi_dev_from_minor(minor); |
376 | if (!dev) | |
c88db469 IA |
377 | return -ENODEV; |
378 | ||
7f4656c5 | 379 | mutex_lock(&dev->mutex); |
da56fdc6 | 380 | s = comedi_read_subdevice(dev, minor); |
72fd9fac | 381 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
7f4656c5 | 382 | err = resize_async_buffer(dev, s, s->async, size); |
72fd9fac HS |
383 | else |
384 | err = -EINVAL; | |
7f4656c5 | 385 | mutex_unlock(&dev->mutex); |
a5011a26 | 386 | |
72fd9fac | 387 | return err ? err : count; |
a5011a26 | 388 | } |
883db3d9 | 389 | |
7a4e5a9f | 390 | static ssize_t show_max_write_buffer_kb(struct device *csdev, |
a5011a26 HS |
391 | struct device_attribute *attr, |
392 | char *buf) | |
393 | { | |
c88db469 | 394 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
395 | struct comedi_device *dev; |
396 | struct comedi_subdevice *s; | |
72fd9fac | 397 | unsigned int size = 0; |
a5011a26 | 398 | |
5e04c254 IA |
399 | dev = comedi_dev_from_minor(minor); |
400 | if (!dev) | |
c88db469 IA |
401 | return -ENODEV; |
402 | ||
7f4656c5 | 403 | mutex_lock(&dev->mutex); |
da56fdc6 | 404 | s = comedi_write_subdevice(dev, minor); |
72fd9fac HS |
405 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
406 | size = s->async->max_bufsize / 1024; | |
7f4656c5 | 407 | mutex_unlock(&dev->mutex); |
a5011a26 | 408 | |
72fd9fac | 409 | return snprintf(buf, PAGE_SIZE, "%i\n", size); |
a5011a26 HS |
410 | } |
411 | ||
7a4e5a9f | 412 | static ssize_t store_max_write_buffer_kb(struct device *csdev, |
a5011a26 HS |
413 | struct device_attribute *attr, |
414 | const char *buf, size_t count) | |
415 | { | |
c88db469 | 416 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
417 | struct comedi_device *dev; |
418 | struct comedi_subdevice *s; | |
72fd9fac HS |
419 | unsigned int size; |
420 | int err; | |
421 | ||
422 | err = kstrtouint(buf, 10, &size); | |
423 | if (err) | |
424 | return err; | |
425 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 426 | return -EINVAL; |
72fd9fac | 427 | size *= 1024; |
a5011a26 | 428 | |
5e04c254 IA |
429 | dev = comedi_dev_from_minor(minor); |
430 | if (!dev) | |
c88db469 IA |
431 | return -ENODEV; |
432 | ||
7f4656c5 | 433 | mutex_lock(&dev->mutex); |
da56fdc6 | 434 | s = comedi_write_subdevice(dev, minor); |
72fd9fac HS |
435 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
436 | s->async->max_bufsize = size; | |
437 | else | |
438 | err = -EINVAL; | |
7f4656c5 | 439 | mutex_unlock(&dev->mutex); |
a5011a26 | 440 | |
72fd9fac | 441 | return err ? err : count; |
a5011a26 HS |
442 | } |
443 | ||
7a4e5a9f | 444 | static ssize_t show_write_buffer_kb(struct device *csdev, |
a5011a26 HS |
445 | struct device_attribute *attr, char *buf) |
446 | { | |
c88db469 | 447 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
448 | struct comedi_device *dev; |
449 | struct comedi_subdevice *s; | |
72fd9fac | 450 | unsigned int size = 0; |
a5011a26 | 451 | |
5e04c254 IA |
452 | dev = comedi_dev_from_minor(minor); |
453 | if (!dev) | |
c88db469 IA |
454 | return -ENODEV; |
455 | ||
7f4656c5 | 456 | mutex_lock(&dev->mutex); |
da56fdc6 | 457 | s = comedi_write_subdevice(dev, minor); |
72fd9fac HS |
458 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
459 | size = s->async->prealloc_bufsz / 1024; | |
7f4656c5 | 460 | mutex_unlock(&dev->mutex); |
a5011a26 | 461 | |
72fd9fac | 462 | return snprintf(buf, PAGE_SIZE, "%i\n", size); |
a5011a26 HS |
463 | } |
464 | ||
7a4e5a9f | 465 | static ssize_t store_write_buffer_kb(struct device *csdev, |
a5011a26 HS |
466 | struct device_attribute *attr, |
467 | const char *buf, size_t count) | |
468 | { | |
c88db469 | 469 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
470 | struct comedi_device *dev; |
471 | struct comedi_subdevice *s; | |
72fd9fac HS |
472 | unsigned int size; |
473 | int err; | |
474 | ||
475 | err = kstrtouint(buf, 10, &size); | |
476 | if (err) | |
477 | return err; | |
478 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 479 | return -EINVAL; |
72fd9fac | 480 | size *= 1024; |
a5011a26 | 481 | |
5e04c254 IA |
482 | dev = comedi_dev_from_minor(minor); |
483 | if (!dev) | |
c88db469 IA |
484 | return -ENODEV; |
485 | ||
7f4656c5 | 486 | mutex_lock(&dev->mutex); |
da56fdc6 | 487 | s = comedi_write_subdevice(dev, minor); |
72fd9fac | 488 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
7f4656c5 | 489 | err = resize_async_buffer(dev, s, s->async, size); |
72fd9fac HS |
490 | else |
491 | err = -EINVAL; | |
7f4656c5 | 492 | mutex_unlock(&dev->mutex); |
a5011a26 | 493 | |
72fd9fac | 494 | return err ? err : count; |
a5011a26 HS |
495 | } |
496 | ||
fb60367d HS |
497 | static struct device_attribute comedi_dev_attrs[] = { |
498 | __ATTR(max_read_buffer_kb, S_IRUGO | S_IWUSR, | |
499 | show_max_read_buffer_kb, store_max_read_buffer_kb), | |
500 | __ATTR(read_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP, | |
501 | show_read_buffer_kb, store_read_buffer_kb), | |
502 | __ATTR(max_write_buffer_kb, S_IRUGO | S_IWUSR, | |
503 | show_max_write_buffer_kb, store_max_write_buffer_kb), | |
504 | __ATTR(write_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP, | |
505 | show_write_buffer_kb, store_write_buffer_kb), | |
506 | __ATTR_NULL | |
a5011a26 | 507 | }; |
ed9eccbe | 508 | |
2aae0076 HS |
509 | static void comedi_set_subdevice_runflags(struct comedi_subdevice *s, |
510 | unsigned mask, unsigned bits) | |
511 | { | |
512 | unsigned long flags; | |
513 | ||
514 | spin_lock_irqsave(&s->spin_lock, flags); | |
515 | s->runflags &= ~mask; | |
516 | s->runflags |= (bits & mask); | |
517 | spin_unlock_irqrestore(&s->spin_lock, flags); | |
518 | } | |
519 | ||
ade1764f | 520 | static unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s) |
74120719 HS |
521 | { |
522 | unsigned long flags; | |
523 | unsigned runflags; | |
524 | ||
525 | spin_lock_irqsave(&s->spin_lock, flags); | |
526 | runflags = s->runflags; | |
527 | spin_unlock_irqrestore(&s->spin_lock, flags); | |
528 | return runflags; | |
529 | } | |
74120719 | 530 | |
e0dac318 HS |
531 | bool comedi_is_subdevice_running(struct comedi_subdevice *s) |
532 | { | |
533 | unsigned runflags = comedi_get_subdevice_runflags(s); | |
534 | ||
535 | return (runflags & SRF_RUNNING) ? true : false; | |
536 | } | |
537 | EXPORT_SYMBOL_GPL(comedi_is_subdevice_running); | |
538 | ||
c098c21a HS |
539 | static bool comedi_is_subdevice_in_error(struct comedi_subdevice *s) |
540 | { | |
541 | unsigned runflags = comedi_get_subdevice_runflags(s); | |
542 | ||
543 | return (runflags & SRF_ERROR) ? true : false; | |
544 | } | |
545 | ||
9682e28c HS |
546 | static bool comedi_is_subdevice_idle(struct comedi_subdevice *s) |
547 | { | |
548 | unsigned runflags = comedi_get_subdevice_runflags(s); | |
549 | ||
550 | return (runflags & (SRF_ERROR | SRF_RUNNING)) ? false : true; | |
551 | } | |
552 | ||
2aae0076 HS |
553 | /* |
554 | This function restores a subdevice to an idle state. | |
555 | */ | |
556 | static void do_become_nonbusy(struct comedi_device *dev, | |
557 | struct comedi_subdevice *s) | |
558 | { | |
559 | struct comedi_async *async = s->async; | |
560 | ||
561 | comedi_set_subdevice_runflags(s, SRF_RUNNING, 0); | |
562 | if (async) { | |
61c9fb0e | 563 | comedi_buf_reset(async); |
2aae0076 HS |
564 | async->inttrig = NULL; |
565 | kfree(async->cmd.chanlist); | |
566 | async->cmd.chanlist = NULL; | |
567 | } else { | |
568 | dev_err(dev->class_dev, | |
569 | "BUG: (?) do_become_nonbusy called with async=NULL\n"); | |
570 | } | |
571 | ||
572 | s->busy = NULL; | |
573 | } | |
574 | ||
575 | static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s) | |
576 | { | |
577 | int ret = 0; | |
578 | ||
f0124630 | 579 | if (comedi_is_subdevice_running(s) && s->cancel) |
2aae0076 HS |
580 | ret = s->cancel(dev, s); |
581 | ||
582 | do_become_nonbusy(dev, s); | |
583 | ||
584 | return ret; | |
585 | } | |
586 | ||
587 | static int is_device_busy(struct comedi_device *dev) | |
588 | { | |
589 | struct comedi_subdevice *s; | |
590 | int i; | |
591 | ||
592 | if (!dev->attached) | |
593 | return 0; | |
594 | ||
595 | for (i = 0; i < dev->n_subdevices; i++) { | |
596 | s = &dev->subdevices[i]; | |
597 | if (s->busy) | |
598 | return 1; | |
599 | if (s->async && s->async->mmap_count) | |
600 | return 1; | |
601 | } | |
602 | ||
603 | return 0; | |
604 | } | |
605 | ||
ed9eccbe DS |
606 | /* |
607 | COMEDI_DEVCONFIG | |
608 | device config ioctl | |
609 | ||
610 | arg: | |
611 | pointer to devconfig structure | |
612 | ||
613 | reads: | |
614 | devconfig structure at arg | |
615 | ||
616 | writes: | |
617 | none | |
618 | */ | |
0a85b6f0 | 619 | static int do_devconfig_ioctl(struct comedi_device *dev, |
92d0127c | 620 | struct comedi_devconfig __user *arg) |
ed9eccbe | 621 | { |
0707bb04 | 622 | struct comedi_devconfig it; |
ed9eccbe DS |
623 | |
624 | if (!capable(CAP_SYS_ADMIN)) | |
625 | return -EPERM; | |
626 | ||
627 | if (arg == NULL) { | |
628 | if (is_device_busy(dev)) | |
629 | return -EBUSY; | |
476b8477 | 630 | if (dev->attached) { |
ed9eccbe DS |
631 | struct module *driver_module = dev->driver->module; |
632 | comedi_device_detach(dev); | |
633 | module_put(driver_module); | |
634 | } | |
635 | return 0; | |
636 | } | |
637 | ||
bc252fd1 | 638 | if (copy_from_user(&it, arg, sizeof(it))) |
ed9eccbe DS |
639 | return -EFAULT; |
640 | ||
641 | it.board_name[COMEDI_NAMELEN - 1] = 0; | |
642 | ||
d1843132 HS |
643 | if (it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) { |
644 | dev_warn(dev->class_dev, | |
645 | "comedi_config --init_data is deprecated\n"); | |
646 | return -EINVAL; | |
ed9eccbe DS |
647 | } |
648 | ||
8ab4ed6e IA |
649 | if (dev->minor >= comedi_num_legacy_minors) |
650 | /* don't re-use dynamically allocated comedi devices */ | |
651 | return -EBUSY; | |
652 | ||
b2a644b4 IA |
653 | /* This increments the driver module count on success. */ |
654 | return comedi_device_attach(dev, &it); | |
ed9eccbe DS |
655 | } |
656 | ||
657 | /* | |
658 | COMEDI_BUFCONFIG | |
659 | buffer configuration ioctl | |
660 | ||
661 | arg: | |
662 | pointer to bufconfig structure | |
663 | ||
664 | reads: | |
665 | bufconfig at arg | |
666 | ||
667 | writes: | |
668 | modified bufconfig at arg | |
669 | ||
670 | */ | |
92d0127c GKH |
671 | static int do_bufconfig_ioctl(struct comedi_device *dev, |
672 | struct comedi_bufconfig __user *arg) | |
ed9eccbe | 673 | { |
be6aba4a | 674 | struct comedi_bufconfig bc; |
d163679c | 675 | struct comedi_async *async; |
34c43922 | 676 | struct comedi_subdevice *s; |
883db3d9 | 677 | int retval = 0; |
ed9eccbe | 678 | |
bc252fd1 | 679 | if (copy_from_user(&bc, arg, sizeof(bc))) |
ed9eccbe DS |
680 | return -EFAULT; |
681 | ||
682 | if (bc.subdevice >= dev->n_subdevices || bc.subdevice < 0) | |
683 | return -EINVAL; | |
684 | ||
b077f2cd | 685 | s = &dev->subdevices[bc.subdevice]; |
ed9eccbe DS |
686 | async = s->async; |
687 | ||
688 | if (!async) { | |
689 | DPRINTK("subdevice does not have async capability\n"); | |
690 | bc.size = 0; | |
691 | bc.maximum_size = 0; | |
692 | goto copyback; | |
693 | } | |
694 | ||
695 | if (bc.maximum_size) { | |
696 | if (!capable(CAP_SYS_ADMIN)) | |
697 | return -EPERM; | |
698 | ||
699 | async->max_bufsize = bc.maximum_size; | |
700 | } | |
701 | ||
702 | if (bc.size) { | |
883db3d9 FMH |
703 | retval = resize_async_buffer(dev, s, async, bc.size); |
704 | if (retval < 0) | |
705 | return retval; | |
ed9eccbe DS |
706 | } |
707 | ||
708 | bc.size = async->prealloc_bufsz; | |
709 | bc.maximum_size = async->max_bufsize; | |
710 | ||
476b8477 | 711 | copyback: |
bc252fd1 | 712 | if (copy_to_user(arg, &bc, sizeof(bc))) |
ed9eccbe DS |
713 | return -EFAULT; |
714 | ||
715 | return 0; | |
716 | } | |
717 | ||
718 | /* | |
719 | COMEDI_DEVINFO | |
720 | device info ioctl | |
721 | ||
722 | arg: | |
723 | pointer to devinfo structure | |
724 | ||
725 | reads: | |
726 | none | |
727 | ||
728 | writes: | |
729 | devinfo structure | |
730 | ||
731 | */ | |
0a85b6f0 | 732 | static int do_devinfo_ioctl(struct comedi_device *dev, |
92d0127c GKH |
733 | struct comedi_devinfo __user *arg, |
734 | struct file *file) | |
ed9eccbe | 735 | { |
6131ffaa | 736 | const unsigned minor = iminor(file_inode(file)); |
0e700923 HS |
737 | struct comedi_subdevice *s; |
738 | struct comedi_devinfo devinfo; | |
ed9eccbe DS |
739 | |
740 | memset(&devinfo, 0, sizeof(devinfo)); | |
741 | ||
742 | /* fill devinfo structure */ | |
743 | devinfo.version_code = COMEDI_VERSION_CODE; | |
744 | devinfo.n_subdevs = dev->n_subdevices; | |
819cbb12 VK |
745 | strlcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN); |
746 | strlcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN); | |
ed9eccbe | 747 | |
da56fdc6 | 748 | s = comedi_read_subdevice(dev, minor); |
0e700923 | 749 | if (s) |
90a35c15 | 750 | devinfo.read_subdevice = s->index; |
476b8477 | 751 | else |
ed9eccbe | 752 | devinfo.read_subdevice = -1; |
476b8477 | 753 | |
da56fdc6 | 754 | s = comedi_write_subdevice(dev, minor); |
0e700923 | 755 | if (s) |
90a35c15 | 756 | devinfo.write_subdevice = s->index; |
476b8477 | 757 | else |
ed9eccbe | 758 | devinfo.write_subdevice = -1; |
ed9eccbe | 759 | |
bc252fd1 | 760 | if (copy_to_user(arg, &devinfo, sizeof(devinfo))) |
ed9eccbe DS |
761 | return -EFAULT; |
762 | ||
763 | return 0; | |
764 | } | |
765 | ||
766 | /* | |
767 | COMEDI_SUBDINFO | |
768 | subdevice info ioctl | |
769 | ||
770 | arg: | |
771 | pointer to array of subdevice info structures | |
772 | ||
773 | reads: | |
774 | none | |
775 | ||
776 | writes: | |
777 | array of subdevice info structures at arg | |
778 | ||
779 | */ | |
0a85b6f0 | 780 | static int do_subdinfo_ioctl(struct comedi_device *dev, |
92d0127c | 781 | struct comedi_subdinfo __user *arg, void *file) |
ed9eccbe DS |
782 | { |
783 | int ret, i; | |
bd52efbb | 784 | struct comedi_subdinfo *tmp, *us; |
34c43922 | 785 | struct comedi_subdevice *s; |
ed9eccbe | 786 | |
bc252fd1 | 787 | tmp = kcalloc(dev->n_subdevices, sizeof(*tmp), GFP_KERNEL); |
ed9eccbe DS |
788 | if (!tmp) |
789 | return -ENOMEM; | |
790 | ||
791 | /* fill subdinfo structs */ | |
792 | for (i = 0; i < dev->n_subdevices; i++) { | |
b077f2cd | 793 | s = &dev->subdevices[i]; |
ed9eccbe DS |
794 | us = tmp + i; |
795 | ||
796 | us->type = s->type; | |
797 | us->n_chan = s->n_chan; | |
798 | us->subd_flags = s->subdev_flags; | |
f0124630 | 799 | if (comedi_is_subdevice_running(s)) |
ed9eccbe DS |
800 | us->subd_flags |= SDF_RUNNING; |
801 | #define TIMER_nanosec 5 /* backwards compatibility */ | |
802 | us->timer_type = TIMER_nanosec; | |
803 | us->len_chanlist = s->len_chanlist; | |
804 | us->maxdata = s->maxdata; | |
805 | if (s->range_table) { | |
806 | us->range_type = | |
476b8477 | 807 | (i << 24) | (0 << 16) | (s->range_table->length); |
ed9eccbe DS |
808 | } else { |
809 | us->range_type = 0; /* XXX */ | |
810 | } | |
811 | us->flags = s->flags; | |
812 | ||
813 | if (s->busy) | |
814 | us->subd_flags |= SDF_BUSY; | |
815 | if (s->busy == file) | |
816 | us->subd_flags |= SDF_BUSY_OWNER; | |
817 | if (s->lock) | |
818 | us->subd_flags |= SDF_LOCKED; | |
819 | if (s->lock == file) | |
820 | us->subd_flags |= SDF_LOCK_OWNER; | |
821 | if (!s->maxdata && s->maxdata_list) | |
822 | us->subd_flags |= SDF_MAXDATA; | |
823 | if (s->flaglist) | |
824 | us->subd_flags |= SDF_FLAGS; | |
825 | if (s->range_table_list) | |
826 | us->subd_flags |= SDF_RANGETYPE; | |
827 | if (s->do_cmd) | |
828 | us->subd_flags |= SDF_CMD; | |
829 | ||
830 | if (s->insn_bits != &insn_inval) | |
831 | us->insn_bits_support = COMEDI_SUPPORTED; | |
832 | else | |
833 | us->insn_bits_support = COMEDI_UNSUPPORTED; | |
834 | ||
835 | us->settling_time_0 = s->settling_time_0; | |
836 | } | |
837 | ||
bc252fd1 | 838 | ret = copy_to_user(arg, tmp, dev->n_subdevices * sizeof(*tmp)); |
ed9eccbe DS |
839 | |
840 | kfree(tmp); | |
841 | ||
842 | return ret ? -EFAULT : 0; | |
843 | } | |
844 | ||
845 | /* | |
846 | COMEDI_CHANINFO | |
847 | subdevice info ioctl | |
848 | ||
849 | arg: | |
850 | pointer to chaninfo structure | |
851 | ||
852 | reads: | |
853 | chaninfo structure at arg | |
854 | ||
855 | writes: | |
856 | arrays at elements of chaninfo structure | |
857 | ||
858 | */ | |
0a85b6f0 | 859 | static int do_chaninfo_ioctl(struct comedi_device *dev, |
92d0127c | 860 | struct comedi_chaninfo __user *arg) |
ed9eccbe | 861 | { |
34c43922 | 862 | struct comedi_subdevice *s; |
a18b416d | 863 | struct comedi_chaninfo it; |
ed9eccbe | 864 | |
bc252fd1 | 865 | if (copy_from_user(&it, arg, sizeof(it))) |
ed9eccbe DS |
866 | return -EFAULT; |
867 | ||
868 | if (it.subdev >= dev->n_subdevices) | |
869 | return -EINVAL; | |
b077f2cd | 870 | s = &dev->subdevices[it.subdev]; |
ed9eccbe DS |
871 | |
872 | if (it.maxdata_list) { | |
873 | if (s->maxdata || !s->maxdata_list) | |
874 | return -EINVAL; | |
875 | if (copy_to_user(it.maxdata_list, s->maxdata_list, | |
790c5541 | 876 | s->n_chan * sizeof(unsigned int))) |
ed9eccbe DS |
877 | return -EFAULT; |
878 | } | |
879 | ||
880 | if (it.flaglist) { | |
881 | if (!s->flaglist) | |
882 | return -EINVAL; | |
883 | if (copy_to_user(it.flaglist, s->flaglist, | |
476b8477 | 884 | s->n_chan * sizeof(unsigned int))) |
ed9eccbe DS |
885 | return -EFAULT; |
886 | } | |
887 | ||
888 | if (it.rangelist) { | |
889 | int i; | |
890 | ||
891 | if (!s->range_table_list) | |
892 | return -EINVAL; | |
893 | for (i = 0; i < s->n_chan; i++) { | |
894 | int x; | |
895 | ||
896 | x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) | | |
476b8477 | 897 | (s->range_table_list[i]->length); |
81604d43 VK |
898 | if (put_user(x, it.rangelist + i)) |
899 | return -EFAULT; | |
ed9eccbe | 900 | } |
476b8477 GKH |
901 | #if 0 |
902 | if (copy_to_user(it.rangelist, s->range_type_list, | |
0a85b6f0 | 903 | s->n_chan * sizeof(unsigned int))) |
476b8477 GKH |
904 | return -EFAULT; |
905 | #endif | |
ed9eccbe DS |
906 | } |
907 | ||
908 | return 0; | |
909 | } | |
910 | ||
911 | /* | |
912 | COMEDI_BUFINFO | |
913 | buffer information ioctl | |
914 | ||
915 | arg: | |
916 | pointer to bufinfo structure | |
917 | ||
918 | reads: | |
919 | bufinfo at arg | |
920 | ||
921 | writes: | |
922 | modified bufinfo at arg | |
923 | ||
924 | */ | |
92d0127c | 925 | static int do_bufinfo_ioctl(struct comedi_device *dev, |
53fa827e | 926 | struct comedi_bufinfo __user *arg, void *file) |
ed9eccbe | 927 | { |
9aa5339a | 928 | struct comedi_bufinfo bi; |
34c43922 | 929 | struct comedi_subdevice *s; |
d163679c | 930 | struct comedi_async *async; |
ed9eccbe | 931 | |
bc252fd1 | 932 | if (copy_from_user(&bi, arg, sizeof(bi))) |
ed9eccbe DS |
933 | return -EFAULT; |
934 | ||
935 | if (bi.subdevice >= dev->n_subdevices || bi.subdevice < 0) | |
936 | return -EINVAL; | |
937 | ||
b077f2cd | 938 | s = &dev->subdevices[bi.subdevice]; |
53fa827e IA |
939 | |
940 | if (s->lock && s->lock != file) | |
941 | return -EACCES; | |
942 | ||
ed9eccbe DS |
943 | async = s->async; |
944 | ||
945 | if (!async) { | |
946 | DPRINTK("subdevice does not have async capability\n"); | |
947 | bi.buf_write_ptr = 0; | |
948 | bi.buf_read_ptr = 0; | |
949 | bi.buf_write_count = 0; | |
950 | bi.buf_read_count = 0; | |
4772c018 IA |
951 | bi.bytes_read = 0; |
952 | bi.bytes_written = 0; | |
ed9eccbe DS |
953 | goto copyback; |
954 | } | |
53fa827e IA |
955 | if (!s->busy) { |
956 | bi.bytes_read = 0; | |
957 | bi.bytes_written = 0; | |
958 | goto copyback_position; | |
959 | } | |
960 | if (s->busy != file) | |
961 | return -EACCES; | |
ed9eccbe DS |
962 | |
963 | if (bi.bytes_read && (s->subdev_flags & SDF_CMD_READ)) { | |
964 | bi.bytes_read = comedi_buf_read_alloc(async, bi.bytes_read); | |
965 | comedi_buf_read_free(async, bi.bytes_read); | |
966 | ||
9682e28c HS |
967 | if (comedi_is_subdevice_idle(s) && |
968 | async->buf_write_count == async->buf_read_count) { | |
ed9eccbe DS |
969 | do_become_nonbusy(dev, s); |
970 | } | |
971 | } | |
972 | ||
973 | if (bi.bytes_written && (s->subdev_flags & SDF_CMD_WRITE)) { | |
974 | bi.bytes_written = | |
476b8477 | 975 | comedi_buf_write_alloc(async, bi.bytes_written); |
ed9eccbe DS |
976 | comedi_buf_write_free(async, bi.bytes_written); |
977 | } | |
978 | ||
53fa827e | 979 | copyback_position: |
ed9eccbe DS |
980 | bi.buf_write_count = async->buf_write_count; |
981 | bi.buf_write_ptr = async->buf_write_ptr; | |
982 | bi.buf_read_count = async->buf_read_count; | |
983 | bi.buf_read_ptr = async->buf_read_ptr; | |
984 | ||
476b8477 | 985 | copyback: |
bc252fd1 | 986 | if (copy_to_user(arg, &bi, sizeof(bi))) |
ed9eccbe DS |
987 | return -EFAULT; |
988 | ||
989 | return 0; | |
990 | } | |
991 | ||
0a85b6f0 MT |
992 | static int check_insn_config_length(struct comedi_insn *insn, |
993 | unsigned int *data) | |
ed9eccbe | 994 | { |
476b8477 GKH |
995 | if (insn->n < 1) |
996 | return -EINVAL; | |
ed9eccbe DS |
997 | |
998 | switch (data[0]) { | |
999 | case INSN_CONFIG_DIO_OUTPUT: | |
1000 | case INSN_CONFIG_DIO_INPUT: | |
1001 | case INSN_CONFIG_DISARM: | |
1002 | case INSN_CONFIG_RESET: | |
1003 | if (insn->n == 1) | |
1004 | return 0; | |
1005 | break; | |
1006 | case INSN_CONFIG_ARM: | |
1007 | case INSN_CONFIG_DIO_QUERY: | |
1008 | case INSN_CONFIG_BLOCK_SIZE: | |
1009 | case INSN_CONFIG_FILTER: | |
1010 | case INSN_CONFIG_SERIAL_CLOCK: | |
1011 | case INSN_CONFIG_BIDIRECTIONAL_DATA: | |
1012 | case INSN_CONFIG_ALT_SOURCE: | |
1013 | case INSN_CONFIG_SET_COUNTER_MODE: | |
1014 | case INSN_CONFIG_8254_READ_STATUS: | |
1015 | case INSN_CONFIG_SET_ROUTING: | |
1016 | case INSN_CONFIG_GET_ROUTING: | |
1017 | case INSN_CONFIG_GET_PWM_STATUS: | |
1018 | case INSN_CONFIG_PWM_SET_PERIOD: | |
1019 | case INSN_CONFIG_PWM_GET_PERIOD: | |
1020 | if (insn->n == 2) | |
1021 | return 0; | |
1022 | break; | |
1023 | case INSN_CONFIG_SET_GATE_SRC: | |
1024 | case INSN_CONFIG_GET_GATE_SRC: | |
1025 | case INSN_CONFIG_SET_CLOCK_SRC: | |
1026 | case INSN_CONFIG_GET_CLOCK_SRC: | |
1027 | case INSN_CONFIG_SET_OTHER_SRC: | |
1028 | case INSN_CONFIG_GET_COUNTER_STATUS: | |
1029 | case INSN_CONFIG_PWM_SET_H_BRIDGE: | |
1030 | case INSN_CONFIG_PWM_GET_H_BRIDGE: | |
1031 | case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE: | |
1032 | if (insn->n == 3) | |
1033 | return 0; | |
1034 | break; | |
1035 | case INSN_CONFIG_PWM_OUTPUT: | |
1036 | case INSN_CONFIG_ANALOG_TRIG: | |
1037 | if (insn->n == 5) | |
1038 | return 0; | |
1039 | break; | |
b0a2b6d8 IA |
1040 | case INSN_CONFIG_DIGITAL_TRIG: |
1041 | if (insn->n == 6) | |
1042 | return 0; | |
1043 | break; | |
0a85b6f0 MT |
1044 | /* by default we allow the insn since we don't have checks for |
1045 | * all possible cases yet */ | |
ed9eccbe | 1046 | default: |
4f870fe6 IA |
1047 | pr_warn("comedi: No check for data length of config insn id %i is implemented.\n", |
1048 | data[0]); | |
1049 | pr_warn("comedi: Add a check to %s in %s.\n", | |
1050 | __func__, __FILE__); | |
1051 | pr_warn("comedi: Assuming n=%i is correct.\n", insn->n); | |
ed9eccbe | 1052 | return 0; |
ed9eccbe DS |
1053 | } |
1054 | return -EINVAL; | |
1055 | } | |
1056 | ||
0a85b6f0 MT |
1057 | static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn, |
1058 | unsigned int *data, void *file) | |
ed9eccbe | 1059 | { |
34c43922 | 1060 | struct comedi_subdevice *s; |
ed9eccbe DS |
1061 | int ret = 0; |
1062 | int i; | |
1063 | ||
1064 | if (insn->insn & INSN_MASK_SPECIAL) { | |
1065 | /* a non-subdevice instruction */ | |
1066 | ||
1067 | switch (insn->insn) { | |
1068 | case INSN_GTOD: | |
1069 | { | |
1070 | struct timeval tv; | |
1071 | ||
1072 | if (insn->n != 2) { | |
1073 | ret = -EINVAL; | |
1074 | break; | |
1075 | } | |
1076 | ||
1077 | do_gettimeofday(&tv); | |
1078 | data[0] = tv.tv_sec; | |
1079 | data[1] = tv.tv_usec; | |
1080 | ret = 2; | |
1081 | ||
1082 | break; | |
1083 | } | |
1084 | case INSN_WAIT: | |
1085 | if (insn->n != 1 || data[0] >= 100000) { | |
1086 | ret = -EINVAL; | |
1087 | break; | |
1088 | } | |
1089 | udelay(data[0] / 1000); | |
1090 | ret = 1; | |
1091 | break; | |
1092 | case INSN_INTTRIG: | |
1093 | if (insn->n != 1) { | |
1094 | ret = -EINVAL; | |
1095 | break; | |
1096 | } | |
1097 | if (insn->subdev >= dev->n_subdevices) { | |
1098 | DPRINTK("%d not usable subdevice\n", | |
1099 | insn->subdev); | |
1100 | ret = -EINVAL; | |
1101 | break; | |
1102 | } | |
b077f2cd | 1103 | s = &dev->subdevices[insn->subdev]; |
ed9eccbe DS |
1104 | if (!s->async) { |
1105 | DPRINTK("no async\n"); | |
1106 | ret = -EINVAL; | |
1107 | break; | |
1108 | } | |
1109 | if (!s->async->inttrig) { | |
1110 | DPRINTK("no inttrig\n"); | |
1111 | ret = -EAGAIN; | |
1112 | break; | |
1113 | } | |
5d06e3df | 1114 | ret = s->async->inttrig(dev, s, data[0]); |
ed9eccbe DS |
1115 | if (ret >= 0) |
1116 | ret = 1; | |
1117 | break; | |
1118 | default: | |
1119 | DPRINTK("invalid insn\n"); | |
1120 | ret = -EINVAL; | |
1121 | break; | |
1122 | } | |
1123 | } else { | |
1124 | /* a subdevice instruction */ | |
790c5541 | 1125 | unsigned int maxdata; |
ed9eccbe DS |
1126 | |
1127 | if (insn->subdev >= dev->n_subdevices) { | |
1128 | DPRINTK("subdevice %d out of range\n", insn->subdev); | |
1129 | ret = -EINVAL; | |
1130 | goto out; | |
1131 | } | |
b077f2cd | 1132 | s = &dev->subdevices[insn->subdev]; |
ed9eccbe DS |
1133 | |
1134 | if (s->type == COMEDI_SUBD_UNUSED) { | |
1135 | DPRINTK("%d not usable subdevice\n", insn->subdev); | |
1136 | ret = -EIO; | |
1137 | goto out; | |
1138 | } | |
1139 | ||
1140 | /* are we locked? (ioctl lock) */ | |
1141 | if (s->lock && s->lock != file) { | |
1142 | DPRINTK("device locked\n"); | |
1143 | ret = -EACCES; | |
1144 | goto out; | |
1145 | } | |
1146 | ||
0fd0ca75 | 1147 | ret = comedi_check_chanlist(s, 1, &insn->chanspec); |
476b8477 | 1148 | if (ret < 0) { |
ed9eccbe DS |
1149 | ret = -EINVAL; |
1150 | DPRINTK("bad chanspec\n"); | |
1151 | goto out; | |
1152 | } | |
1153 | ||
1154 | if (s->busy) { | |
1155 | ret = -EBUSY; | |
1156 | goto out; | |
1157 | } | |
1158 | /* This looks arbitrary. It is. */ | |
1159 | s->busy = &parse_insn; | |
1160 | switch (insn->insn) { | |
1161 | case INSN_READ: | |
1162 | ret = s->insn_read(dev, s, insn, data); | |
1163 | break; | |
1164 | case INSN_WRITE: | |
1165 | maxdata = s->maxdata_list | |
476b8477 GKH |
1166 | ? s->maxdata_list[CR_CHAN(insn->chanspec)] |
1167 | : s->maxdata; | |
ed9eccbe DS |
1168 | for (i = 0; i < insn->n; ++i) { |
1169 | if (data[i] > maxdata) { | |
1170 | ret = -EINVAL; | |
1171 | DPRINTK("bad data value(s)\n"); | |
1172 | break; | |
1173 | } | |
1174 | } | |
1175 | if (ret == 0) | |
1176 | ret = s->insn_write(dev, s, insn, data); | |
1177 | break; | |
1178 | case INSN_BITS: | |
1179 | if (insn->n != 2) { | |
1180 | ret = -EINVAL; | |
2f644ccf IA |
1181 | } else { |
1182 | /* Most drivers ignore the base channel in | |
1183 | * insn->chanspec. Fix this here if | |
1184 | * the subdevice has <= 32 channels. */ | |
1185 | unsigned int shift; | |
1186 | unsigned int orig_mask; | |
1187 | ||
1188 | orig_mask = data[0]; | |
1189 | if (s->n_chan <= 32) { | |
1190 | shift = CR_CHAN(insn->chanspec); | |
1191 | if (shift > 0) { | |
1192 | insn->chanspec = 0; | |
1193 | data[0] <<= shift; | |
1194 | data[1] <<= shift; | |
1195 | } | |
1196 | } else | |
1197 | shift = 0; | |
1198 | ret = s->insn_bits(dev, s, insn, data); | |
1199 | data[0] = orig_mask; | |
1200 | if (shift > 0) | |
1201 | data[1] >>= shift; | |
ed9eccbe | 1202 | } |
ed9eccbe DS |
1203 | break; |
1204 | case INSN_CONFIG: | |
1205 | ret = check_insn_config_length(insn, data); | |
1206 | if (ret) | |
1207 | break; | |
1208 | ret = s->insn_config(dev, s, insn, data); | |
1209 | break; | |
1210 | default: | |
1211 | ret = -EINVAL; | |
1212 | break; | |
1213 | } | |
1214 | ||
1215 | s->busy = NULL; | |
1216 | } | |
1217 | ||
476b8477 | 1218 | out: |
ed9eccbe DS |
1219 | return ret; |
1220 | } | |
1221 | ||
5b6cbd87 HS |
1222 | /* |
1223 | * COMEDI_INSNLIST | |
1224 | * synchronous instructions | |
1225 | * | |
1226 | * arg: | |
1227 | * pointer to sync cmd structure | |
1228 | * | |
1229 | * reads: | |
1230 | * sync cmd struct at arg | |
1231 | * instruction list | |
1232 | * data (for writes) | |
1233 | * | |
1234 | * writes: | |
1235 | * data (for reads) | |
1236 | */ | |
1237 | /* arbitrary limits */ | |
1238 | #define MAX_SAMPLES 256 | |
1239 | static int do_insnlist_ioctl(struct comedi_device *dev, | |
1240 | struct comedi_insnlist __user *arg, void *file) | |
1241 | { | |
1242 | struct comedi_insnlist insnlist; | |
1243 | struct comedi_insn *insns = NULL; | |
1244 | unsigned int *data = NULL; | |
1245 | int i = 0; | |
1246 | int ret = 0; | |
1247 | ||
1248 | if (copy_from_user(&insnlist, arg, sizeof(insnlist))) | |
1249 | return -EFAULT; | |
1250 | ||
1251 | data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL); | |
1252 | if (!data) { | |
1253 | DPRINTK("kmalloc failed\n"); | |
1254 | ret = -ENOMEM; | |
1255 | goto error; | |
1256 | } | |
1257 | ||
1258 | insns = kcalloc(insnlist.n_insns, sizeof(*insns), GFP_KERNEL); | |
1259 | if (!insns) { | |
1260 | DPRINTK("kmalloc failed\n"); | |
1261 | ret = -ENOMEM; | |
1262 | goto error; | |
1263 | } | |
1264 | ||
1265 | if (copy_from_user(insns, insnlist.insns, | |
1266 | sizeof(*insns) * insnlist.n_insns)) { | |
1267 | DPRINTK("copy_from_user failed\n"); | |
1268 | ret = -EFAULT; | |
1269 | goto error; | |
1270 | } | |
1271 | ||
1272 | for (i = 0; i < insnlist.n_insns; i++) { | |
1273 | if (insns[i].n > MAX_SAMPLES) { | |
1274 | DPRINTK("number of samples too large\n"); | |
1275 | ret = -EINVAL; | |
1276 | goto error; | |
1277 | } | |
1278 | if (insns[i].insn & INSN_MASK_WRITE) { | |
1279 | if (copy_from_user(data, insns[i].data, | |
1280 | insns[i].n * sizeof(unsigned int))) { | |
1281 | DPRINTK("copy_from_user failed\n"); | |
1282 | ret = -EFAULT; | |
1283 | goto error; | |
1284 | } | |
1285 | } | |
1286 | ret = parse_insn(dev, insns + i, data, file); | |
1287 | if (ret < 0) | |
1288 | goto error; | |
1289 | if (insns[i].insn & INSN_MASK_READ) { | |
1290 | if (copy_to_user(insns[i].data, data, | |
1291 | insns[i].n * sizeof(unsigned int))) { | |
1292 | DPRINTK("copy_to_user failed\n"); | |
1293 | ret = -EFAULT; | |
1294 | goto error; | |
1295 | } | |
1296 | } | |
1297 | if (need_resched()) | |
1298 | schedule(); | |
1299 | } | |
1300 | ||
1301 | error: | |
1302 | kfree(insns); | |
1303 | kfree(data); | |
1304 | ||
1305 | if (ret < 0) | |
1306 | return ret; | |
1307 | return i; | |
1308 | } | |
1309 | ||
ed9eccbe | 1310 | /* |
20617f22 PDP |
1311 | * COMEDI_INSN |
1312 | * synchronous instructions | |
ed9eccbe | 1313 | * |
20617f22 PDP |
1314 | * arg: |
1315 | * pointer to insn | |
ed9eccbe | 1316 | * |
20617f22 PDP |
1317 | * reads: |
1318 | * struct comedi_insn struct at arg | |
1319 | * data (for writes) | |
ed9eccbe | 1320 | * |
20617f22 PDP |
1321 | * writes: |
1322 | * data (for reads) | |
ed9eccbe | 1323 | */ |
92d0127c GKH |
1324 | static int do_insn_ioctl(struct comedi_device *dev, |
1325 | struct comedi_insn __user *arg, void *file) | |
ed9eccbe | 1326 | { |
90035c08 | 1327 | struct comedi_insn insn; |
790c5541 | 1328 | unsigned int *data = NULL; |
ed9eccbe DS |
1329 | int ret = 0; |
1330 | ||
790c5541 | 1331 | data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL); |
ed9eccbe DS |
1332 | if (!data) { |
1333 | ret = -ENOMEM; | |
1334 | goto error; | |
1335 | } | |
1336 | ||
bc252fd1 | 1337 | if (copy_from_user(&insn, arg, sizeof(insn))) { |
ed9eccbe DS |
1338 | ret = -EFAULT; |
1339 | goto error; | |
1340 | } | |
1341 | ||
1342 | /* This is where the behavior of insn and insnlist deviate. */ | |
1343 | if (insn.n > MAX_SAMPLES) | |
1344 | insn.n = MAX_SAMPLES; | |
1345 | if (insn.insn & INSN_MASK_WRITE) { | |
21fe2eea M |
1346 | if (copy_from_user(data, |
1347 | insn.data, | |
1348 | insn.n * sizeof(unsigned int))) { | |
ed9eccbe DS |
1349 | ret = -EFAULT; |
1350 | goto error; | |
1351 | } | |
1352 | } | |
1353 | ret = parse_insn(dev, &insn, data, file); | |
1354 | if (ret < 0) | |
1355 | goto error; | |
1356 | if (insn.insn & INSN_MASK_READ) { | |
21fe2eea M |
1357 | if (copy_to_user(insn.data, |
1358 | data, | |
1359 | insn.n * sizeof(unsigned int))) { | |
ed9eccbe DS |
1360 | ret = -EFAULT; |
1361 | goto error; | |
1362 | } | |
1363 | } | |
1364 | ret = insn.n; | |
1365 | ||
476b8477 GKH |
1366 | error: |
1367 | kfree(data); | |
ed9eccbe DS |
1368 | |
1369 | return ret; | |
1370 | } | |
1371 | ||
92d0127c | 1372 | static int do_cmd_ioctl(struct comedi_device *dev, |
cbe01f72 | 1373 | struct comedi_cmd __user *arg, void *file) |
ed9eccbe | 1374 | { |
88bc0574 | 1375 | struct comedi_cmd cmd; |
34c43922 | 1376 | struct comedi_subdevice *s; |
d163679c | 1377 | struct comedi_async *async; |
ed9eccbe | 1378 | int ret = 0; |
95bc359f | 1379 | unsigned int __user *user_chanlist; |
ed9eccbe | 1380 | |
bc252fd1 | 1381 | if (copy_from_user(&cmd, arg, sizeof(cmd))) { |
ed9eccbe DS |
1382 | DPRINTK("bad cmd address\n"); |
1383 | return -EFAULT; | |
1384 | } | |
476b8477 | 1385 | /* save user's chanlist pointer so it can be restored later */ |
95bc359f | 1386 | user_chanlist = (unsigned int __user *)cmd.chanlist; |
ed9eccbe | 1387 | |
88bc0574 HS |
1388 | if (cmd.subdev >= dev->n_subdevices) { |
1389 | DPRINTK("%d no such subdevice\n", cmd.subdev); | |
ed9eccbe DS |
1390 | return -ENODEV; |
1391 | } | |
1392 | ||
88bc0574 | 1393 | s = &dev->subdevices[cmd.subdev]; |
ed9eccbe DS |
1394 | async = s->async; |
1395 | ||
1396 | if (s->type == COMEDI_SUBD_UNUSED) { | |
88bc0574 | 1397 | DPRINTK("%d not valid subdevice\n", cmd.subdev); |
ed9eccbe DS |
1398 | return -EIO; |
1399 | } | |
1400 | ||
1401 | if (!s->do_cmd || !s->do_cmdtest || !s->async) { | |
1402 | DPRINTK("subdevice %i does not support commands\n", | |
88bc0574 | 1403 | cmd.subdev); |
ed9eccbe DS |
1404 | return -EIO; |
1405 | } | |
1406 | ||
1407 | /* are we locked? (ioctl lock) */ | |
1408 | if (s->lock && s->lock != file) { | |
1409 | DPRINTK("subdevice locked\n"); | |
1410 | return -EACCES; | |
1411 | } | |
1412 | ||
1413 | /* are we busy? */ | |
1414 | if (s->busy) { | |
1415 | DPRINTK("subdevice busy\n"); | |
1416 | return -EBUSY; | |
1417 | } | |
1418 | s->busy = file; | |
1419 | ||
1420 | /* make sure channel/gain list isn't too long */ | |
88bc0574 | 1421 | if (cmd.chanlist_len > s->len_chanlist) { |
ed9eccbe | 1422 | DPRINTK("channel/gain list too long %u > %d\n", |
88bc0574 | 1423 | cmd.chanlist_len, s->len_chanlist); |
ed9eccbe DS |
1424 | ret = -EINVAL; |
1425 | goto cleanup; | |
1426 | } | |
1427 | ||
1428 | /* make sure channel/gain list isn't too short */ | |
88bc0574 | 1429 | if (cmd.chanlist_len < 1) { |
ed9eccbe | 1430 | DPRINTK("channel/gain list too short %u < 1\n", |
88bc0574 | 1431 | cmd.chanlist_len); |
ed9eccbe DS |
1432 | ret = -EINVAL; |
1433 | goto cleanup; | |
1434 | } | |
1435 | ||
88bc0574 | 1436 | async->cmd = cmd; |
ed9eccbe DS |
1437 | async->cmd.data = NULL; |
1438 | /* load channel/gain list */ | |
1439 | async->cmd.chanlist = | |
476b8477 | 1440 | kmalloc(async->cmd.chanlist_len * sizeof(int), GFP_KERNEL); |
ed9eccbe DS |
1441 | if (!async->cmd.chanlist) { |
1442 | DPRINTK("allocation failed\n"); | |
1443 | ret = -ENOMEM; | |
1444 | goto cleanup; | |
1445 | } | |
1446 | ||
95bc359f | 1447 | if (copy_from_user(async->cmd.chanlist, user_chanlist, |
476b8477 | 1448 | async->cmd.chanlist_len * sizeof(int))) { |
ed9eccbe DS |
1449 | DPRINTK("fault reading chanlist\n"); |
1450 | ret = -EFAULT; | |
1451 | goto cleanup; | |
1452 | } | |
1453 | ||
1454 | /* make sure each element in channel/gain list is valid */ | |
21fe2eea M |
1455 | ret = comedi_check_chanlist(s, |
1456 | async->cmd.chanlist_len, | |
1457 | async->cmd.chanlist); | |
476b8477 | 1458 | if (ret < 0) { |
ed9eccbe DS |
1459 | DPRINTK("bad chanlist\n"); |
1460 | goto cleanup; | |
1461 | } | |
1462 | ||
1463 | ret = s->do_cmdtest(dev, s, &async->cmd); | |
1464 | ||
1465 | if (async->cmd.flags & TRIG_BOGUS || ret) { | |
1466 | DPRINTK("test returned %d\n", ret); | |
88bc0574 | 1467 | cmd = async->cmd; |
476b8477 | 1468 | /* restore chanlist pointer before copying back */ |
95bc359f | 1469 | cmd.chanlist = (unsigned int __force *)user_chanlist; |
88bc0574 | 1470 | cmd.data = NULL; |
bc252fd1 | 1471 | if (copy_to_user(arg, &cmd, sizeof(cmd))) { |
ed9eccbe DS |
1472 | DPRINTK("fault writing cmd\n"); |
1473 | ret = -EFAULT; | |
1474 | goto cleanup; | |
1475 | } | |
1476 | ret = -EAGAIN; | |
1477 | goto cleanup; | |
1478 | } | |
1479 | ||
1480 | if (!async->prealloc_bufsz) { | |
1481 | ret = -ENOMEM; | |
1482 | DPRINTK("no buffer (?)\n"); | |
1483 | goto cleanup; | |
1484 | } | |
1485 | ||
61c9fb0e | 1486 | comedi_buf_reset(async); |
ed9eccbe DS |
1487 | |
1488 | async->cb_mask = | |
476b8477 GKH |
1489 | COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR | |
1490 | COMEDI_CB_OVERFLOW; | |
1491 | if (async->cmd.flags & TRIG_WAKE_EOS) | |
ed9eccbe | 1492 | async->cb_mask |= COMEDI_CB_EOS; |
ed9eccbe DS |
1493 | |
1494 | comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING); | |
1495 | ||
ed9eccbe DS |
1496 | ret = s->do_cmd(dev, s); |
1497 | if (ret == 0) | |
1498 | return 0; | |
1499 | ||
476b8477 | 1500 | cleanup: |
ed9eccbe DS |
1501 | do_become_nonbusy(dev, s); |
1502 | ||
1503 | return ret; | |
1504 | } | |
1505 | ||
1506 | /* | |
1507 | COMEDI_CMDTEST | |
1508 | command testing ioctl | |
1509 | ||
1510 | arg: | |
1511 | pointer to cmd structure | |
1512 | ||
1513 | reads: | |
1514 | cmd structure at arg | |
1515 | channel/range list | |
1516 | ||
1517 | writes: | |
1518 | modified cmd structure at arg | |
1519 | ||
1520 | */ | |
92d0127c GKH |
1521 | static int do_cmdtest_ioctl(struct comedi_device *dev, |
1522 | struct comedi_cmd __user *arg, void *file) | |
ed9eccbe | 1523 | { |
f8348677 | 1524 | struct comedi_cmd cmd; |
34c43922 | 1525 | struct comedi_subdevice *s; |
ed9eccbe DS |
1526 | int ret = 0; |
1527 | unsigned int *chanlist = NULL; | |
95bc359f | 1528 | unsigned int __user *user_chanlist; |
ed9eccbe | 1529 | |
bc252fd1 | 1530 | if (copy_from_user(&cmd, arg, sizeof(cmd))) { |
ed9eccbe DS |
1531 | DPRINTK("bad cmd address\n"); |
1532 | return -EFAULT; | |
1533 | } | |
476b8477 | 1534 | /* save user's chanlist pointer so it can be restored later */ |
95bc359f | 1535 | user_chanlist = (unsigned int __user *)cmd.chanlist; |
ed9eccbe | 1536 | |
f8348677 HS |
1537 | if (cmd.subdev >= dev->n_subdevices) { |
1538 | DPRINTK("%d no such subdevice\n", cmd.subdev); | |
ed9eccbe DS |
1539 | return -ENODEV; |
1540 | } | |
1541 | ||
f8348677 | 1542 | s = &dev->subdevices[cmd.subdev]; |
ed9eccbe | 1543 | if (s->type == COMEDI_SUBD_UNUSED) { |
f8348677 | 1544 | DPRINTK("%d not valid subdevice\n", cmd.subdev); |
ed9eccbe DS |
1545 | return -EIO; |
1546 | } | |
1547 | ||
1548 | if (!s->do_cmd || !s->do_cmdtest) { | |
1549 | DPRINTK("subdevice %i does not support commands\n", | |
f8348677 | 1550 | cmd.subdev); |
ed9eccbe DS |
1551 | return -EIO; |
1552 | } | |
1553 | ||
1554 | /* make sure channel/gain list isn't too long */ | |
f8348677 | 1555 | if (cmd.chanlist_len > s->len_chanlist) { |
ed9eccbe | 1556 | DPRINTK("channel/gain list too long %d > %d\n", |
f8348677 | 1557 | cmd.chanlist_len, s->len_chanlist); |
ed9eccbe DS |
1558 | ret = -EINVAL; |
1559 | goto cleanup; | |
1560 | } | |
1561 | ||
1562 | /* load channel/gain list */ | |
f8348677 | 1563 | if (cmd.chanlist) { |
ed9eccbe | 1564 | chanlist = |
f8348677 | 1565 | kmalloc(cmd.chanlist_len * sizeof(int), GFP_KERNEL); |
ed9eccbe DS |
1566 | if (!chanlist) { |
1567 | DPRINTK("allocation failed\n"); | |
1568 | ret = -ENOMEM; | |
1569 | goto cleanup; | |
1570 | } | |
1571 | ||
95bc359f | 1572 | if (copy_from_user(chanlist, user_chanlist, |
f8348677 | 1573 | cmd.chanlist_len * sizeof(int))) { |
ed9eccbe DS |
1574 | DPRINTK("fault reading chanlist\n"); |
1575 | ret = -EFAULT; | |
1576 | goto cleanup; | |
1577 | } | |
1578 | ||
1579 | /* make sure each element in channel/gain list is valid */ | |
f8348677 | 1580 | ret = comedi_check_chanlist(s, cmd.chanlist_len, chanlist); |
476b8477 | 1581 | if (ret < 0) { |
ed9eccbe DS |
1582 | DPRINTK("bad chanlist\n"); |
1583 | goto cleanup; | |
1584 | } | |
1585 | ||
f8348677 | 1586 | cmd.chanlist = chanlist; |
ed9eccbe DS |
1587 | } |
1588 | ||
f8348677 | 1589 | ret = s->do_cmdtest(dev, s, &cmd); |
ed9eccbe | 1590 | |
476b8477 | 1591 | /* restore chanlist pointer before copying back */ |
95bc359f | 1592 | cmd.chanlist = (unsigned int __force *)user_chanlist; |
ed9eccbe | 1593 | |
bc252fd1 | 1594 | if (copy_to_user(arg, &cmd, sizeof(cmd))) { |
ed9eccbe DS |
1595 | DPRINTK("bad cmd address\n"); |
1596 | ret = -EFAULT; | |
1597 | goto cleanup; | |
1598 | } | |
476b8477 GKH |
1599 | cleanup: |
1600 | kfree(chanlist); | |
ed9eccbe DS |
1601 | |
1602 | return ret; | |
1603 | } | |
1604 | ||
1605 | /* | |
1606 | COMEDI_LOCK | |
1607 | lock subdevice | |
1608 | ||
1609 | arg: | |
1610 | subdevice number | |
1611 | ||
1612 | reads: | |
1613 | none | |
1614 | ||
1615 | writes: | |
1616 | none | |
1617 | ||
1618 | */ | |
1619 | ||
0a85b6f0 MT |
1620 | static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg, |
1621 | void *file) | |
ed9eccbe DS |
1622 | { |
1623 | int ret = 0; | |
1624 | unsigned long flags; | |
34c43922 | 1625 | struct comedi_subdevice *s; |
ed9eccbe DS |
1626 | |
1627 | if (arg >= dev->n_subdevices) | |
1628 | return -EINVAL; | |
b077f2cd | 1629 | s = &dev->subdevices[arg]; |
ed9eccbe | 1630 | |
5f74ea14 | 1631 | spin_lock_irqsave(&s->spin_lock, flags); |
476b8477 | 1632 | if (s->busy || s->lock) |
ed9eccbe | 1633 | ret = -EBUSY; |
476b8477 | 1634 | else |
ed9eccbe | 1635 | s->lock = file; |
5f74ea14 | 1636 | spin_unlock_irqrestore(&s->spin_lock, flags); |
ed9eccbe | 1637 | |
c5274ab0 | 1638 | #if 0 |
ed9eccbe DS |
1639 | if (ret < 0) |
1640 | return ret; | |
1641 | ||
ed9eccbe DS |
1642 | if (s->lock_f) |
1643 | ret = s->lock_f(dev, s); | |
1644 | #endif | |
1645 | ||
1646 | return ret; | |
1647 | } | |
1648 | ||
1649 | /* | |
1650 | COMEDI_UNLOCK | |
1651 | unlock subdevice | |
1652 | ||
1653 | arg: | |
1654 | subdevice number | |
1655 | ||
1656 | reads: | |
1657 | none | |
1658 | ||
1659 | writes: | |
1660 | none | |
1661 | ||
1662 | This function isn't protected by the semaphore, since | |
1663 | we already own the lock. | |
1664 | */ | |
0a85b6f0 MT |
1665 | static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg, |
1666 | void *file) | |
ed9eccbe | 1667 | { |
34c43922 | 1668 | struct comedi_subdevice *s; |
ed9eccbe DS |
1669 | |
1670 | if (arg >= dev->n_subdevices) | |
1671 | return -EINVAL; | |
b077f2cd | 1672 | s = &dev->subdevices[arg]; |
ed9eccbe DS |
1673 | |
1674 | if (s->busy) | |
1675 | return -EBUSY; | |
1676 | ||
1677 | if (s->lock && s->lock != file) | |
1678 | return -EACCES; | |
1679 | ||
1680 | if (s->lock == file) { | |
1681 | #if 0 | |
1682 | if (s->unlock) | |
1683 | s->unlock(dev, s); | |
1684 | #endif | |
1685 | ||
1686 | s->lock = NULL; | |
1687 | } | |
1688 | ||
1689 | return 0; | |
1690 | } | |
1691 | ||
1692 | /* | |
1693 | COMEDI_CANCEL | |
1694 | cancel acquisition ioctl | |
1695 | ||
1696 | arg: | |
1697 | subdevice number | |
1698 | ||
1699 | reads: | |
1700 | nothing | |
1701 | ||
1702 | writes: | |
1703 | nothing | |
1704 | ||
1705 | */ | |
0a85b6f0 MT |
1706 | static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg, |
1707 | void *file) | |
ed9eccbe | 1708 | { |
34c43922 | 1709 | struct comedi_subdevice *s; |
ed9eccbe DS |
1710 | |
1711 | if (arg >= dev->n_subdevices) | |
1712 | return -EINVAL; | |
b077f2cd | 1713 | s = &dev->subdevices[arg]; |
ed9eccbe DS |
1714 | if (s->async == NULL) |
1715 | return -EINVAL; | |
1716 | ||
1717 | if (s->lock && s->lock != file) | |
1718 | return -EACCES; | |
1719 | ||
1720 | if (!s->busy) | |
1721 | return 0; | |
1722 | ||
1723 | if (s->busy != file) | |
1724 | return -EBUSY; | |
1725 | ||
1726 | return do_cancel(dev, s); | |
1727 | } | |
1728 | ||
1729 | /* | |
1730 | COMEDI_POLL ioctl | |
1731 | instructs driver to synchronize buffers | |
1732 | ||
1733 | arg: | |
1734 | subdevice number | |
1735 | ||
1736 | reads: | |
1737 | nothing | |
1738 | ||
1739 | writes: | |
1740 | nothing | |
1741 | ||
1742 | */ | |
0a85b6f0 MT |
1743 | static int do_poll_ioctl(struct comedi_device *dev, unsigned int arg, |
1744 | void *file) | |
ed9eccbe | 1745 | { |
34c43922 | 1746 | struct comedi_subdevice *s; |
ed9eccbe DS |
1747 | |
1748 | if (arg >= dev->n_subdevices) | |
1749 | return -EINVAL; | |
b077f2cd | 1750 | s = &dev->subdevices[arg]; |
ed9eccbe DS |
1751 | |
1752 | if (s->lock && s->lock != file) | |
1753 | return -EACCES; | |
1754 | ||
1755 | if (!s->busy) | |
1756 | return 0; | |
1757 | ||
1758 | if (s->busy != file) | |
1759 | return -EBUSY; | |
1760 | ||
1761 | if (s->poll) | |
1762 | return s->poll(dev, s); | |
1763 | ||
1764 | return -EINVAL; | |
1765 | } | |
1766 | ||
47db6d58 HS |
1767 | static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd, |
1768 | unsigned long arg) | |
1769 | { | |
6131ffaa | 1770 | const unsigned minor = iminor(file_inode(file)); |
5e04c254 | 1771 | struct comedi_device *dev = comedi_dev_from_minor(minor); |
47db6d58 HS |
1772 | int rc; |
1773 | ||
4da5fa9a | 1774 | if (!dev) |
47db6d58 | 1775 | return -ENODEV; |
47db6d58 HS |
1776 | |
1777 | mutex_lock(&dev->mutex); | |
1778 | ||
1779 | /* Device config is special, because it must work on | |
1780 | * an unconfigured device. */ | |
1781 | if (cmd == COMEDI_DEVCONFIG) { | |
754ab5c0 IA |
1782 | if (minor >= COMEDI_NUM_BOARD_MINORS) { |
1783 | /* Device config not appropriate on non-board minors. */ | |
1784 | rc = -ENOTTY; | |
1785 | goto done; | |
1786 | } | |
47db6d58 HS |
1787 | rc = do_devconfig_ioctl(dev, |
1788 | (struct comedi_devconfig __user *)arg); | |
8ab4ed6e IA |
1789 | if (rc == 0) { |
1790 | if (arg == 0 && | |
1791 | dev->minor >= comedi_num_legacy_minors) { | |
1792 | /* Successfully unconfigured a dynamically | |
1793 | * allocated device. Try and remove it. */ | |
5e04c254 | 1794 | struct comedi_file_info *info; |
ea1cc397 | 1795 | info = comedi_clear_board_minor(dev->minor); |
8ab4ed6e IA |
1796 | if (info) { |
1797 | mutex_unlock(&dev->mutex); | |
1798 | comedi_free_board_file_info(info); | |
1799 | return rc; | |
1800 | } | |
1801 | } | |
1802 | } | |
47db6d58 HS |
1803 | goto done; |
1804 | } | |
1805 | ||
1806 | if (!dev->attached) { | |
1807 | DPRINTK("no driver configured on /dev/comedi%i\n", dev->minor); | |
1808 | rc = -ENODEV; | |
1809 | goto done; | |
1810 | } | |
1811 | ||
1812 | switch (cmd) { | |
1813 | case COMEDI_BUFCONFIG: | |
1814 | rc = do_bufconfig_ioctl(dev, | |
1815 | (struct comedi_bufconfig __user *)arg); | |
1816 | break; | |
1817 | case COMEDI_DEVINFO: | |
1818 | rc = do_devinfo_ioctl(dev, (struct comedi_devinfo __user *)arg, | |
1819 | file); | |
1820 | break; | |
1821 | case COMEDI_SUBDINFO: | |
1822 | rc = do_subdinfo_ioctl(dev, | |
1823 | (struct comedi_subdinfo __user *)arg, | |
1824 | file); | |
1825 | break; | |
1826 | case COMEDI_CHANINFO: | |
1827 | rc = do_chaninfo_ioctl(dev, (void __user *)arg); | |
1828 | break; | |
1829 | case COMEDI_RANGEINFO: | |
1830 | rc = do_rangeinfo_ioctl(dev, (void __user *)arg); | |
1831 | break; | |
1832 | case COMEDI_BUFINFO: | |
1833 | rc = do_bufinfo_ioctl(dev, | |
1834 | (struct comedi_bufinfo __user *)arg, | |
1835 | file); | |
1836 | break; | |
1837 | case COMEDI_LOCK: | |
1838 | rc = do_lock_ioctl(dev, arg, file); | |
1839 | break; | |
1840 | case COMEDI_UNLOCK: | |
1841 | rc = do_unlock_ioctl(dev, arg, file); | |
1842 | break; | |
1843 | case COMEDI_CANCEL: | |
1844 | rc = do_cancel_ioctl(dev, arg, file); | |
1845 | break; | |
1846 | case COMEDI_CMD: | |
1847 | rc = do_cmd_ioctl(dev, (struct comedi_cmd __user *)arg, file); | |
1848 | break; | |
1849 | case COMEDI_CMDTEST: | |
1850 | rc = do_cmdtest_ioctl(dev, (struct comedi_cmd __user *)arg, | |
1851 | file); | |
1852 | break; | |
1853 | case COMEDI_INSNLIST: | |
1854 | rc = do_insnlist_ioctl(dev, | |
1855 | (struct comedi_insnlist __user *)arg, | |
1856 | file); | |
1857 | break; | |
1858 | case COMEDI_INSN: | |
1859 | rc = do_insn_ioctl(dev, (struct comedi_insn __user *)arg, | |
1860 | file); | |
1861 | break; | |
1862 | case COMEDI_POLL: | |
1863 | rc = do_poll_ioctl(dev, arg, file); | |
1864 | break; | |
1865 | default: | |
1866 | rc = -ENOTTY; | |
1867 | break; | |
1868 | } | |
1869 | ||
1870 | done: | |
1871 | mutex_unlock(&dev->mutex); | |
1872 | return rc; | |
1873 | } | |
1874 | ||
df30b21c FV |
1875 | static void comedi_vm_open(struct vm_area_struct *area) |
1876 | { | |
1877 | struct comedi_async *async; | |
1878 | struct comedi_device *dev; | |
1879 | ||
1880 | async = area->vm_private_data; | |
1881 | dev = async->subdevice->device; | |
1882 | ||
1883 | mutex_lock(&dev->mutex); | |
1884 | async->mmap_count++; | |
1885 | mutex_unlock(&dev->mutex); | |
1886 | } | |
1887 | ||
1888 | static void comedi_vm_close(struct vm_area_struct *area) | |
ed9eccbe | 1889 | { |
d163679c | 1890 | struct comedi_async *async; |
71b5f4f1 | 1891 | struct comedi_device *dev; |
ed9eccbe DS |
1892 | |
1893 | async = area->vm_private_data; | |
1894 | dev = async->subdevice->device; | |
1895 | ||
1896 | mutex_lock(&dev->mutex); | |
1897 | async->mmap_count--; | |
1898 | mutex_unlock(&dev->mutex); | |
1899 | } | |
1900 | ||
1901 | static struct vm_operations_struct comedi_vm_ops = { | |
df30b21c FV |
1902 | .open = comedi_vm_open, |
1903 | .close = comedi_vm_close, | |
ed9eccbe DS |
1904 | }; |
1905 | ||
1906 | static int comedi_mmap(struct file *file, struct vm_area_struct *vma) | |
1907 | { | |
6131ffaa | 1908 | const unsigned minor = iminor(file_inode(file)); |
5e04c254 | 1909 | struct comedi_device *dev = comedi_dev_from_minor(minor); |
a52840a9 HS |
1910 | struct comedi_subdevice *s; |
1911 | struct comedi_async *async; | |
ed9eccbe DS |
1912 | unsigned long start = vma->vm_start; |
1913 | unsigned long size; | |
1914 | int n_pages; | |
1915 | int i; | |
1916 | int retval; | |
3ffab428 | 1917 | |
a52840a9 | 1918 | if (!dev) |
70fe742c | 1919 | return -ENODEV; |
ed9eccbe DS |
1920 | |
1921 | mutex_lock(&dev->mutex); | |
a52840a9 | 1922 | |
ed9eccbe DS |
1923 | if (!dev->attached) { |
1924 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
1925 | retval = -ENODEV; | |
1926 | goto done; | |
1927 | } | |
a52840a9 | 1928 | |
476b8477 | 1929 | if (vma->vm_flags & VM_WRITE) |
da56fdc6 | 1930 | s = comedi_write_subdevice(dev, minor); |
476b8477 | 1931 | else |
da56fdc6 | 1932 | s = comedi_read_subdevice(dev, minor); |
a52840a9 | 1933 | if (!s) { |
ed9eccbe DS |
1934 | retval = -EINVAL; |
1935 | goto done; | |
1936 | } | |
a52840a9 | 1937 | |
ed9eccbe | 1938 | async = s->async; |
a52840a9 | 1939 | if (!async) { |
ed9eccbe DS |
1940 | retval = -EINVAL; |
1941 | goto done; | |
1942 | } | |
1943 | ||
1944 | if (vma->vm_pgoff != 0) { | |
1945 | DPRINTK("comedi: mmap() offset must be 0.\n"); | |
1946 | retval = -EINVAL; | |
1947 | goto done; | |
1948 | } | |
1949 | ||
1950 | size = vma->vm_end - vma->vm_start; | |
1951 | if (size > async->prealloc_bufsz) { | |
1952 | retval = -EFAULT; | |
1953 | goto done; | |
1954 | } | |
1955 | if (size & (~PAGE_MASK)) { | |
1956 | retval = -EFAULT; | |
1957 | goto done; | |
1958 | } | |
1959 | ||
1960 | n_pages = size >> PAGE_SHIFT; | |
1961 | for (i = 0; i < n_pages; ++i) { | |
a52840a9 HS |
1962 | struct comedi_buf_page *buf = &async->buf_page_list[i]; |
1963 | ||
ed9eccbe | 1964 | if (remap_pfn_range(vma, start, |
a52840a9 HS |
1965 | page_to_pfn(virt_to_page(buf->virt_addr)), |
1966 | PAGE_SIZE, PAGE_SHARED)) { | |
ed9eccbe DS |
1967 | retval = -EAGAIN; |
1968 | goto done; | |
1969 | } | |
1970 | start += PAGE_SIZE; | |
1971 | } | |
1972 | ||
1973 | vma->vm_ops = &comedi_vm_ops; | |
1974 | vma->vm_private_data = async; | |
1975 | ||
1976 | async->mmap_count++; | |
1977 | ||
1978 | retval = 0; | |
476b8477 | 1979 | done: |
ed9eccbe DS |
1980 | mutex_unlock(&dev->mutex); |
1981 | return retval; | |
1982 | } | |
1983 | ||
1ae5062a | 1984 | static unsigned int comedi_poll(struct file *file, poll_table *wait) |
ed9eccbe DS |
1985 | { |
1986 | unsigned int mask = 0; | |
6131ffaa | 1987 | const unsigned minor = iminor(file_inode(file)); |
5e04c254 | 1988 | struct comedi_device *dev = comedi_dev_from_minor(minor); |
ca081b1d | 1989 | struct comedi_subdevice *s; |
3ffab428 | 1990 | |
ca081b1d | 1991 | if (!dev) |
70fe742c | 1992 | return -ENODEV; |
ed9eccbe DS |
1993 | |
1994 | mutex_lock(&dev->mutex); | |
ca081b1d | 1995 | |
ed9eccbe DS |
1996 | if (!dev->attached) { |
1997 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
ca081b1d | 1998 | goto done; |
ed9eccbe DS |
1999 | } |
2000 | ||
da56fdc6 | 2001 | s = comedi_read_subdevice(dev, minor); |
cc400e18 | 2002 | if (s && s->async) { |
ca081b1d | 2003 | poll_wait(file, &s->async->wait_head, wait); |
f0124630 | 2004 | if (!s->busy || !comedi_is_subdevice_running(s) || |
ca081b1d | 2005 | comedi_buf_read_n_available(s->async) > 0) |
ed9eccbe | 2006 | mask |= POLLIN | POLLRDNORM; |
ed9eccbe | 2007 | } |
ca081b1d | 2008 | |
da56fdc6 | 2009 | s = comedi_write_subdevice(dev, minor); |
cc400e18 | 2010 | if (s && s->async) { |
ca081b1d HS |
2011 | unsigned int bps = bytes_per_sample(s->async->subdevice); |
2012 | ||
2013 | poll_wait(file, &s->async->wait_head, wait); | |
2014 | comedi_buf_write_alloc(s->async, s->async->prealloc_bufsz); | |
f0124630 | 2015 | if (!s->busy || !comedi_is_subdevice_running(s) || |
ca081b1d | 2016 | comedi_buf_write_n_allocated(s->async) >= bps) |
ed9eccbe | 2017 | mask |= POLLOUT | POLLWRNORM; |
ed9eccbe DS |
2018 | } |
2019 | ||
ca081b1d | 2020 | done: |
ed9eccbe DS |
2021 | mutex_unlock(&dev->mutex); |
2022 | return mask; | |
2023 | } | |
2024 | ||
92d0127c GKH |
2025 | static ssize_t comedi_write(struct file *file, const char __user *buf, |
2026 | size_t nbytes, loff_t *offset) | |
ed9eccbe | 2027 | { |
34c43922 | 2028 | struct comedi_subdevice *s; |
d163679c | 2029 | struct comedi_async *async; |
ed9eccbe DS |
2030 | int n, m, count = 0, retval = 0; |
2031 | DECLARE_WAITQUEUE(wait, current); | |
6131ffaa | 2032 | const unsigned minor = iminor(file_inode(file)); |
5e04c254 | 2033 | struct comedi_device *dev = comedi_dev_from_minor(minor); |
3ffab428 | 2034 | |
2714b019 | 2035 | if (!dev) |
70fe742c | 2036 | return -ENODEV; |
ed9eccbe DS |
2037 | |
2038 | if (!dev->attached) { | |
2039 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
2714b019 | 2040 | return -ENODEV; |
ed9eccbe DS |
2041 | } |
2042 | ||
da56fdc6 | 2043 | s = comedi_write_subdevice(dev, minor); |
cc400e18 | 2044 | if (!s || !s->async) |
2714b019 HS |
2045 | return -EIO; |
2046 | ||
ed9eccbe DS |
2047 | async = s->async; |
2048 | ||
2714b019 HS |
2049 | if (!s->busy || !nbytes) |
2050 | return 0; | |
2051 | if (s->busy != file) | |
2052 | return -EACCES; | |
2053 | ||
ed9eccbe DS |
2054 | add_wait_queue(&async->wait_head, &wait); |
2055 | while (nbytes > 0 && !retval) { | |
2056 | set_current_state(TASK_INTERRUPTIBLE); | |
2057 | ||
f0124630 | 2058 | if (!comedi_is_subdevice_running(s)) { |
d2611540 | 2059 | if (count == 0) { |
c098c21a | 2060 | if (comedi_is_subdevice_in_error(s)) |
d2611540 | 2061 | retval = -EPIPE; |
c098c21a | 2062 | else |
d2611540 | 2063 | retval = 0; |
d2611540 IA |
2064 | do_become_nonbusy(dev, s); |
2065 | } | |
2066 | break; | |
2067 | } | |
2068 | ||
ed9eccbe DS |
2069 | n = nbytes; |
2070 | ||
2071 | m = n; | |
476b8477 | 2072 | if (async->buf_write_ptr + m > async->prealloc_bufsz) |
ed9eccbe | 2073 | m = async->prealloc_bufsz - async->buf_write_ptr; |
ed9eccbe | 2074 | comedi_buf_write_alloc(async, async->prealloc_bufsz); |
476b8477 | 2075 | if (m > comedi_buf_write_n_allocated(async)) |
ed9eccbe | 2076 | m = comedi_buf_write_n_allocated(async); |
ed9eccbe DS |
2077 | if (m < n) |
2078 | n = m; | |
2079 | ||
2080 | if (n == 0) { | |
ed9eccbe DS |
2081 | if (file->f_flags & O_NONBLOCK) { |
2082 | retval = -EAGAIN; | |
2083 | break; | |
2084 | } | |
6a9ce6b6 | 2085 | schedule(); |
ed9eccbe DS |
2086 | if (signal_pending(current)) { |
2087 | retval = -ERESTARTSYS; | |
2088 | break; | |
2089 | } | |
476b8477 | 2090 | if (!s->busy) |
ed9eccbe | 2091 | break; |
ed9eccbe DS |
2092 | if (s->busy != file) { |
2093 | retval = -EACCES; | |
2094 | break; | |
2095 | } | |
2096 | continue; | |
2097 | } | |
2098 | ||
2099 | m = copy_from_user(async->prealloc_buf + async->buf_write_ptr, | |
476b8477 | 2100 | buf, n); |
ed9eccbe DS |
2101 | if (m) { |
2102 | n -= m; | |
2103 | retval = -EFAULT; | |
2104 | } | |
2105 | comedi_buf_write_free(async, n); | |
2106 | ||
2107 | count += n; | |
2108 | nbytes -= n; | |
2109 | ||
2110 | buf += n; | |
2111 | break; /* makes device work like a pipe */ | |
2112 | } | |
2113 | set_current_state(TASK_RUNNING); | |
2114 | remove_wait_queue(&async->wait_head, &wait); | |
2115 | ||
476b8477 | 2116 | return count ? count : retval; |
ed9eccbe DS |
2117 | } |
2118 | ||
92d0127c | 2119 | static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes, |
6705b68d | 2120 | loff_t *offset) |
ed9eccbe | 2121 | { |
34c43922 | 2122 | struct comedi_subdevice *s; |
d163679c | 2123 | struct comedi_async *async; |
ed9eccbe DS |
2124 | int n, m, count = 0, retval = 0; |
2125 | DECLARE_WAITQUEUE(wait, current); | |
6131ffaa | 2126 | const unsigned minor = iminor(file_inode(file)); |
5e04c254 | 2127 | struct comedi_device *dev = comedi_dev_from_minor(minor); |
3ffab428 | 2128 | |
5c87fef5 | 2129 | if (!dev) |
70fe742c | 2130 | return -ENODEV; |
ed9eccbe DS |
2131 | |
2132 | if (!dev->attached) { | |
2133 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
5c87fef5 | 2134 | return -ENODEV; |
ed9eccbe DS |
2135 | } |
2136 | ||
da56fdc6 | 2137 | s = comedi_read_subdevice(dev, minor); |
cc400e18 | 2138 | if (!s || !s->async) |
5c87fef5 HS |
2139 | return -EIO; |
2140 | ||
ed9eccbe | 2141 | async = s->async; |
5c87fef5 HS |
2142 | if (!s->busy || !nbytes) |
2143 | return 0; | |
2144 | if (s->busy != file) | |
2145 | return -EACCES; | |
ed9eccbe DS |
2146 | |
2147 | add_wait_queue(&async->wait_head, &wait); | |
2148 | while (nbytes > 0 && !retval) { | |
2149 | set_current_state(TASK_INTERRUPTIBLE); | |
2150 | ||
2151 | n = nbytes; | |
2152 | ||
2153 | m = comedi_buf_read_n_available(async); | |
476b8477 GKH |
2154 | /* printk("%d available\n",m); */ |
2155 | if (async->buf_read_ptr + m > async->prealloc_bufsz) | |
ed9eccbe | 2156 | m = async->prealloc_bufsz - async->buf_read_ptr; |
476b8477 | 2157 | /* printk("%d contiguous\n",m); */ |
ed9eccbe DS |
2158 | if (m < n) |
2159 | n = m; | |
2160 | ||
2161 | if (n == 0) { | |
f0124630 | 2162 | if (!comedi_is_subdevice_running(s)) { |
ed9eccbe | 2163 | do_become_nonbusy(dev, s); |
c098c21a | 2164 | if (comedi_is_subdevice_in_error(s)) |
ed9eccbe | 2165 | retval = -EPIPE; |
c098c21a | 2166 | else |
ed9eccbe | 2167 | retval = 0; |
ed9eccbe DS |
2168 | break; |
2169 | } | |
2170 | if (file->f_flags & O_NONBLOCK) { | |
2171 | retval = -EAGAIN; | |
2172 | break; | |
2173 | } | |
6a9ce6b6 | 2174 | schedule(); |
ed9eccbe DS |
2175 | if (signal_pending(current)) { |
2176 | retval = -ERESTARTSYS; | |
2177 | break; | |
2178 | } | |
ed9eccbe DS |
2179 | if (!s->busy) { |
2180 | retval = 0; | |
2181 | break; | |
2182 | } | |
2183 | if (s->busy != file) { | |
2184 | retval = -EACCES; | |
2185 | break; | |
2186 | } | |
2187 | continue; | |
2188 | } | |
2189 | m = copy_to_user(buf, async->prealloc_buf + | |
476b8477 | 2190 | async->buf_read_ptr, n); |
ed9eccbe DS |
2191 | if (m) { |
2192 | n -= m; | |
2193 | retval = -EFAULT; | |
2194 | } | |
2195 | ||
2196 | comedi_buf_read_alloc(async, n); | |
2197 | comedi_buf_read_free(async, n); | |
2198 | ||
2199 | count += n; | |
2200 | nbytes -= n; | |
2201 | ||
2202 | buf += n; | |
2203 | break; /* makes device work like a pipe */ | |
2204 | } | |
9682e28c | 2205 | if (comedi_is_subdevice_idle(s) && |
476b8477 | 2206 | async->buf_read_count - async->buf_write_count == 0) { |
ed9eccbe DS |
2207 | do_become_nonbusy(dev, s); |
2208 | } | |
2209 | set_current_state(TASK_RUNNING); | |
2210 | remove_wait_queue(&async->wait_head, &wait); | |
2211 | ||
476b8477 | 2212 | return count ? count : retval; |
ed9eccbe DS |
2213 | } |
2214 | ||
ed9eccbe DS |
2215 | static int comedi_open(struct inode *inode, struct file *file) |
2216 | { | |
ed9eccbe | 2217 | const unsigned minor = iminor(inode); |
4da5fa9a | 2218 | struct comedi_device *dev = comedi_dev_from_minor(minor); |
97920071 | 2219 | |
4da5fa9a | 2220 | if (!dev) { |
ed9eccbe DS |
2221 | DPRINTK("invalid minor number\n"); |
2222 | return -ENODEV; | |
2223 | } | |
2224 | ||
2225 | /* This is slightly hacky, but we want module autoloading | |
2226 | * to work for root. | |
2227 | * case: user opens device, attached -> ok | |
13f12b5a IA |
2228 | * case: user opens device, unattached, !in_request_module -> autoload |
2229 | * case: user opens device, unattached, in_request_module -> fail | |
ed9eccbe | 2230 | * case: root opens device, attached -> ok |
13f12b5a | 2231 | * case: root opens device, unattached, in_request_module -> ok |
ed9eccbe | 2232 | * (typically called from modprobe) |
13f12b5a | 2233 | * case: root opens device, unattached, !in_request_module -> autoload |
ed9eccbe DS |
2234 | * |
2235 | * The last could be changed to "-> ok", which would deny root | |
2236 | * autoloading. | |
2237 | */ | |
2238 | mutex_lock(&dev->mutex); | |
2239 | if (dev->attached) | |
2240 | goto ok; | |
a8f80e8f | 2241 | if (!capable(CAP_NET_ADMIN) && dev->in_request_module) { |
ed9eccbe DS |
2242 | DPRINTK("in request module\n"); |
2243 | mutex_unlock(&dev->mutex); | |
2244 | return -ENODEV; | |
2245 | } | |
a8f80e8f | 2246 | if (capable(CAP_NET_ADMIN) && dev->in_request_module) |
ed9eccbe DS |
2247 | goto ok; |
2248 | ||
13f12b5a | 2249 | dev->in_request_module = true; |
ed9eccbe | 2250 | |
ed9eccbe DS |
2251 | #ifdef CONFIG_KMOD |
2252 | mutex_unlock(&dev->mutex); | |
56d92c60 | 2253 | request_module("char-major-%i-%i", COMEDI_MAJOR, dev->minor); |
ed9eccbe DS |
2254 | mutex_lock(&dev->mutex); |
2255 | #endif | |
2256 | ||
13f12b5a | 2257 | dev->in_request_module = false; |
ed9eccbe | 2258 | |
a8f80e8f EP |
2259 | if (!dev->attached && !capable(CAP_NET_ADMIN)) { |
2260 | DPRINTK("not attached and not CAP_NET_ADMIN\n"); | |
ed9eccbe DS |
2261 | mutex_unlock(&dev->mutex); |
2262 | return -ENODEV; | |
2263 | } | |
2264 | ok: | |
2265 | __module_get(THIS_MODULE); | |
2266 | ||
2267 | if (dev->attached) { | |
2268 | if (!try_module_get(dev->driver->module)) { | |
2269 | module_put(THIS_MODULE); | |
2270 | mutex_unlock(&dev->mutex); | |
2271 | return -ENOSYS; | |
2272 | } | |
2273 | } | |
2274 | ||
3c17ba07 IA |
2275 | if (dev->attached && dev->use_count == 0 && dev->open) { |
2276 | int rc = dev->open(dev); | |
2277 | if (rc < 0) { | |
2278 | module_put(dev->driver->module); | |
2279 | module_put(THIS_MODULE); | |
2280 | mutex_unlock(&dev->mutex); | |
2281 | return rc; | |
2282 | } | |
2283 | } | |
ed9eccbe DS |
2284 | |
2285 | dev->use_count++; | |
2286 | ||
a5011a26 | 2287 | mutex_unlock(&dev->mutex); |
ed9eccbe | 2288 | |
a5011a26 | 2289 | return 0; |
ed9eccbe DS |
2290 | } |
2291 | ||
2aae0076 HS |
2292 | static int comedi_fasync(int fd, struct file *file, int on) |
2293 | { | |
6131ffaa | 2294 | const unsigned minor = iminor(file_inode(file)); |
4da5fa9a | 2295 | struct comedi_device *dev = comedi_dev_from_minor(minor); |
2aae0076 | 2296 | |
4da5fa9a | 2297 | if (!dev) |
2aae0076 HS |
2298 | return -ENODEV; |
2299 | ||
2300 | return fasync_helper(fd, file, on, &dev->async_queue); | |
2301 | } | |
2302 | ||
a5011a26 | 2303 | static int comedi_close(struct inode *inode, struct file *file) |
ed9eccbe | 2304 | { |
a5011a26 | 2305 | const unsigned minor = iminor(inode); |
4da5fa9a | 2306 | struct comedi_device *dev = comedi_dev_from_minor(minor); |
a5011a26 | 2307 | struct comedi_subdevice *s = NULL; |
ed9eccbe DS |
2308 | int i; |
2309 | ||
4da5fa9a | 2310 | if (!dev) |
a5011a26 | 2311 | return -ENODEV; |
ed9eccbe | 2312 | |
a5011a26 HS |
2313 | mutex_lock(&dev->mutex); |
2314 | ||
2315 | if (dev->subdevices) { | |
2316 | for (i = 0; i < dev->n_subdevices; i++) { | |
b077f2cd | 2317 | s = &dev->subdevices[i]; |
a5011a26 HS |
2318 | |
2319 | if (s->busy == file) | |
2320 | do_cancel(dev, s); | |
2321 | if (s->lock == file) | |
2322 | s->lock = NULL; | |
2323 | } | |
ed9eccbe | 2324 | } |
a5011a26 HS |
2325 | if (dev->attached && dev->use_count == 1 && dev->close) |
2326 | dev->close(dev); | |
2327 | ||
2328 | module_put(THIS_MODULE); | |
2329 | if (dev->attached) | |
2330 | module_put(dev->driver->module); | |
2331 | ||
2332 | dev->use_count--; | |
2333 | ||
2334 | mutex_unlock(&dev->mutex); | |
2335 | ||
2336 | if (file->f_flags & FASYNC) | |
2337 | comedi_fasync(-1, file, 0); | |
ed9eccbe DS |
2338 | |
2339 | return 0; | |
2340 | } | |
2341 | ||
8cb8aad7 | 2342 | static const struct file_operations comedi_fops = { |
a5011a26 HS |
2343 | .owner = THIS_MODULE, |
2344 | .unlocked_ioctl = comedi_unlocked_ioctl, | |
2345 | .compat_ioctl = comedi_compat_ioctl, | |
2346 | .open = comedi_open, | |
2347 | .release = comedi_close, | |
2348 | .read = comedi_read, | |
2349 | .write = comedi_write, | |
2350 | .mmap = comedi_mmap, | |
2351 | .poll = comedi_poll, | |
2352 | .fasync = comedi_fasync, | |
2353 | .llseek = noop_llseek, | |
2354 | }; | |
2355 | ||
a5011a26 HS |
2356 | void comedi_error(const struct comedi_device *dev, const char *s) |
2357 | { | |
4f870fe6 | 2358 | dev_err(dev->class_dev, "%s: %s\n", dev->driver->driver_name, s); |
ed9eccbe | 2359 | } |
a5011a26 | 2360 | EXPORT_SYMBOL(comedi_error); |
883db3d9 | 2361 | |
a5011a26 | 2362 | void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s) |
883db3d9 | 2363 | { |
a5011a26 HS |
2364 | struct comedi_async *async = s->async; |
2365 | unsigned runflags = 0; | |
2366 | unsigned runflags_mask = 0; | |
883db3d9 | 2367 | |
a5011a26 | 2368 | /* DPRINTK("comedi_event 0x%x\n",mask); */ |
883db3d9 | 2369 | |
f0124630 | 2370 | if (!comedi_is_subdevice_running(s)) |
a5011a26 HS |
2371 | return; |
2372 | ||
2373 | if (s-> | |
2374 | async->events & (COMEDI_CB_EOA | COMEDI_CB_ERROR | | |
2375 | COMEDI_CB_OVERFLOW)) { | |
2376 | runflags_mask |= SRF_RUNNING; | |
883db3d9 | 2377 | } |
a5011a26 HS |
2378 | /* remember if an error event has occurred, so an error |
2379 | * can be returned the next time the user does a read() */ | |
2380 | if (s->async->events & (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) { | |
2381 | runflags_mask |= SRF_ERROR; | |
2382 | runflags |= SRF_ERROR; | |
883db3d9 | 2383 | } |
a5011a26 HS |
2384 | if (runflags_mask) { |
2385 | /*sets SRF_ERROR and SRF_RUNNING together atomically */ | |
2386 | comedi_set_subdevice_runflags(s, runflags_mask, runflags); | |
883db3d9 FMH |
2387 | } |
2388 | ||
a5011a26 HS |
2389 | if (async->cb_mask & s->async->events) { |
2390 | if (comedi_get_subdevice_runflags(s) & SRF_USER) { | |
2391 | wake_up_interruptible(&async->wait_head); | |
2392 | if (s->subdev_flags & SDF_CMD_READ) | |
2393 | kill_fasync(&dev->async_queue, SIGIO, POLL_IN); | |
2394 | if (s->subdev_flags & SDF_CMD_WRITE) | |
2395 | kill_fasync(&dev->async_queue, SIGIO, POLL_OUT); | |
2396 | } else { | |
2397 | if (async->cb_func) | |
2398 | async->cb_func(s->async->events, async->cb_arg); | |
2399 | } | |
2400 | } | |
2401 | s->async->events = 0; | |
883db3d9 | 2402 | } |
a5011a26 | 2403 | EXPORT_SYMBOL(comedi_event); |
883db3d9 | 2404 | |
07778393 | 2405 | /* Note: the ->mutex is pre-locked on successful return */ |
7638ffcb | 2406 | struct comedi_device *comedi_alloc_board_minor(struct device *hardware_device) |
a5011a26 | 2407 | { |
cd6b7636 | 2408 | struct comedi_file_info *info; |
7638ffcb | 2409 | struct comedi_device *dev; |
a5011a26 HS |
2410 | struct device *csdev; |
2411 | unsigned i; | |
a5011a26 | 2412 | |
bc252fd1 | 2413 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
a5011a26 | 2414 | if (info == NULL) |
7638ffcb IA |
2415 | return ERR_PTR(-ENOMEM); |
2416 | dev = kzalloc(sizeof(struct comedi_device), GFP_KERNEL); | |
2417 | if (dev == NULL) { | |
a5011a26 | 2418 | kfree(info); |
7638ffcb | 2419 | return ERR_PTR(-ENOMEM); |
a5011a26 | 2420 | } |
7638ffcb | 2421 | info->device = dev; |
7638ffcb | 2422 | comedi_device_init(dev); |
db2e3487 | 2423 | comedi_set_hw_dev(dev, hardware_device); |
07778393 | 2424 | mutex_lock(&dev->mutex); |
5b7dba1b | 2425 | mutex_lock(&comedi_board_minor_table_lock); |
38b9722a IA |
2426 | for (i = hardware_device ? comedi_num_legacy_minors : 0; |
2427 | i < COMEDI_NUM_BOARD_MINORS; ++i) { | |
5b7dba1b IA |
2428 | if (comedi_board_minor_table[i] == NULL) { |
2429 | comedi_board_minor_table[i] = info; | |
a5011a26 HS |
2430 | break; |
2431 | } | |
2432 | } | |
5b7dba1b | 2433 | mutex_unlock(&comedi_board_minor_table_lock); |
a5011a26 | 2434 | if (i == COMEDI_NUM_BOARD_MINORS) { |
07778393 | 2435 | mutex_unlock(&dev->mutex); |
7638ffcb IA |
2436 | comedi_device_cleanup(dev); |
2437 | kfree(dev); | |
a5011a26 | 2438 | kfree(info); |
4f870fe6 | 2439 | pr_err("comedi: error: ran out of minor numbers for board device files.\n"); |
7638ffcb | 2440 | return ERR_PTR(-EBUSY); |
a5011a26 | 2441 | } |
7638ffcb | 2442 | dev->minor = i; |
a5011a26 HS |
2443 | csdev = device_create(comedi_class, hardware_device, |
2444 | MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i", i); | |
2445 | if (!IS_ERR(csdev)) | |
7638ffcb | 2446 | dev->class_dev = csdev; |
883db3d9 | 2447 | |
07778393 | 2448 | /* Note: dev->mutex needs to be unlocked by the caller. */ |
7638ffcb | 2449 | return dev; |
883db3d9 FMH |
2450 | } |
2451 | ||
70f30c37 | 2452 | static void comedi_free_board_minor(unsigned minor) |
24fb134d IA |
2453 | { |
2454 | BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS); | |
ea1cc397 | 2455 | comedi_free_board_file_info(comedi_clear_board_minor(minor)); |
24fb134d IA |
2456 | } |
2457 | ||
3346b798 | 2458 | void comedi_release_hardware_device(struct device *hardware_device) |
883db3d9 | 2459 | { |
a5011a26 | 2460 | int minor; |
cd6b7636 | 2461 | struct comedi_file_info *info; |
883db3d9 | 2462 | |
38b9722a IA |
2463 | for (minor = comedi_num_legacy_minors; minor < COMEDI_NUM_BOARD_MINORS; |
2464 | minor++) { | |
5b7dba1b IA |
2465 | mutex_lock(&comedi_board_minor_table_lock); |
2466 | info = comedi_board_minor_table[minor]; | |
0918e595 | 2467 | if (info && info->device->hw_dev == hardware_device) { |
5b7dba1b IA |
2468 | comedi_board_minor_table[minor] = NULL; |
2469 | mutex_unlock(&comedi_board_minor_table_lock); | |
3346b798 IA |
2470 | comedi_free_board_file_info(info); |
2471 | break; | |
a5011a26 | 2472 | } |
5b7dba1b | 2473 | mutex_unlock(&comedi_board_minor_table_lock); |
883db3d9 | 2474 | } |
883db3d9 FMH |
2475 | } |
2476 | ||
f65cc544 | 2477 | int comedi_alloc_subdevice_minor(struct comedi_subdevice *s) |
883db3d9 | 2478 | { |
f65cc544 | 2479 | struct comedi_device *dev = s->device; |
cd6b7636 | 2480 | struct comedi_file_info *info; |
a5011a26 HS |
2481 | struct device *csdev; |
2482 | unsigned i; | |
883db3d9 | 2483 | |
71cf6d3e HS |
2484 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
2485 | if (!info) | |
a5011a26 HS |
2486 | return -ENOMEM; |
2487 | info->device = dev; | |
10464060 IA |
2488 | if (s->subdev_flags & SDF_CMD_READ) |
2489 | info->read_subdevice = s; | |
2490 | if (s->subdev_flags & SDF_CMD_WRITE) | |
2491 | info->write_subdevice = s; | |
5b7dba1b IA |
2492 | mutex_lock(&comedi_subdevice_minor_table_lock); |
2493 | for (i = 0; i < COMEDI_NUM_SUBDEVICE_MINORS; ++i) { | |
2494 | if (comedi_subdevice_minor_table[i] == NULL) { | |
2495 | comedi_subdevice_minor_table[i] = info; | |
a5011a26 HS |
2496 | break; |
2497 | } | |
2498 | } | |
5b7dba1b IA |
2499 | mutex_unlock(&comedi_subdevice_minor_table_lock); |
2500 | if (i == COMEDI_NUM_SUBDEVICE_MINORS) { | |
a5011a26 | 2501 | kfree(info); |
b12da2e4 | 2502 | pr_err("comedi: error: ran out of minor numbers for subdevice files.\n"); |
a5011a26 HS |
2503 | return -EBUSY; |
2504 | } | |
5b7dba1b | 2505 | i += COMEDI_NUM_BOARD_MINORS; |
a5011a26 HS |
2506 | s->minor = i; |
2507 | csdev = device_create(comedi_class, dev->class_dev, | |
2508 | MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i_subd%i", | |
90a35c15 | 2509 | dev->minor, s->index); |
a5011a26 HS |
2510 | if (!IS_ERR(csdev)) |
2511 | s->class_dev = csdev; | |
883db3d9 | 2512 | |
da718546 | 2513 | return 0; |
883db3d9 FMH |
2514 | } |
2515 | ||
a5011a26 | 2516 | void comedi_free_subdevice_minor(struct comedi_subdevice *s) |
883db3d9 | 2517 | { |
cd6b7636 | 2518 | struct comedi_file_info *info; |
0fcc9d48 | 2519 | unsigned int i; |
883db3d9 | 2520 | |
a5011a26 HS |
2521 | if (s == NULL) |
2522 | return; | |
2523 | if (s->minor < 0) | |
2524 | return; | |
883db3d9 | 2525 | |
a5011a26 | 2526 | BUG_ON(s->minor >= COMEDI_NUM_MINORS); |
8907cf6c | 2527 | BUG_ON(s->minor < COMEDI_NUM_BOARD_MINORS); |
883db3d9 | 2528 | |
0fcc9d48 IA |
2529 | i = s->minor - COMEDI_NUM_BOARD_MINORS; |
2530 | mutex_lock(&comedi_subdevice_minor_table_lock); | |
2531 | info = comedi_subdevice_minor_table[i]; | |
2532 | comedi_subdevice_minor_table[i] = NULL; | |
2533 | mutex_unlock(&comedi_subdevice_minor_table_lock); | |
a5011a26 HS |
2534 | if (s->class_dev) { |
2535 | device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor)); | |
2536 | s->class_dev = NULL; | |
883db3d9 | 2537 | } |
a5011a26 | 2538 | kfree(info); |
883db3d9 | 2539 | } |
a5787824 | 2540 | |
682b9119 | 2541 | static void comedi_cleanup_board_minors(void) |
76cca89f HS |
2542 | { |
2543 | unsigned i; | |
2544 | ||
682b9119 | 2545 | for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) |
76cca89f HS |
2546 | comedi_free_board_minor(i); |
2547 | } | |
2548 | ||
91fa0b0c HS |
2549 | static int __init comedi_init(void) |
2550 | { | |
2551 | int i; | |
2552 | int retval; | |
2553 | ||
2554 | pr_info("comedi: version " COMEDI_RELEASE " - http://www.comedi.org\n"); | |
2555 | ||
2556 | if (comedi_num_legacy_minors < 0 || | |
2557 | comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) { | |
2558 | pr_err("comedi: error: invalid value for module parameter \"comedi_num_legacy_minors\". Valid values are 0 through %i.\n", | |
2559 | COMEDI_NUM_BOARD_MINORS); | |
2560 | return -EINVAL; | |
2561 | } | |
2562 | ||
91fa0b0c HS |
2563 | retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0), |
2564 | COMEDI_NUM_MINORS, "comedi"); | |
2565 | if (retval) | |
2566 | return -EIO; | |
2567 | cdev_init(&comedi_cdev, &comedi_fops); | |
2568 | comedi_cdev.owner = THIS_MODULE; | |
2569 | kobject_set_name(&comedi_cdev.kobj, "comedi"); | |
2570 | if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) { | |
2571 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
2572 | COMEDI_NUM_MINORS); | |
2573 | return -EIO; | |
2574 | } | |
2575 | comedi_class = class_create(THIS_MODULE, "comedi"); | |
2576 | if (IS_ERR(comedi_class)) { | |
2577 | pr_err("comedi: failed to create class\n"); | |
2578 | cdev_del(&comedi_cdev); | |
2579 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
2580 | COMEDI_NUM_MINORS); | |
2581 | return PTR_ERR(comedi_class); | |
2582 | } | |
2583 | ||
2584 | comedi_class->dev_attrs = comedi_dev_attrs; | |
2585 | ||
2586 | /* XXX requires /proc interface */ | |
2587 | comedi_proc_init(); | |
2588 | ||
2589 | /* create devices files for legacy/manual use */ | |
2590 | for (i = 0; i < comedi_num_legacy_minors; i++) { | |
7638ffcb IA |
2591 | struct comedi_device *dev; |
2592 | dev = comedi_alloc_board_minor(NULL); | |
2593 | if (IS_ERR(dev)) { | |
682b9119 | 2594 | comedi_cleanup_board_minors(); |
91fa0b0c HS |
2595 | cdev_del(&comedi_cdev); |
2596 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
2597 | COMEDI_NUM_MINORS); | |
7638ffcb | 2598 | return PTR_ERR(dev); |
07778393 IA |
2599 | } else { |
2600 | /* comedi_alloc_board_minor() locked the mutex */ | |
2601 | mutex_unlock(&dev->mutex); | |
91fa0b0c HS |
2602 | } |
2603 | } | |
2604 | ||
2605 | return 0; | |
2606 | } | |
2607 | module_init(comedi_init); | |
2608 | ||
2609 | static void __exit comedi_cleanup(void) | |
2610 | { | |
2611 | int i; | |
2612 | ||
682b9119 | 2613 | comedi_cleanup_board_minors(); |
5b7dba1b IA |
2614 | for (i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i) |
2615 | BUG_ON(comedi_board_minor_table[i]); | |
2616 | for (i = 0; i < COMEDI_NUM_SUBDEVICE_MINORS; ++i) | |
2617 | BUG_ON(comedi_subdevice_minor_table[i]); | |
91fa0b0c HS |
2618 | |
2619 | class_destroy(comedi_class); | |
2620 | cdev_del(&comedi_cdev); | |
2621 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS); | |
2622 | ||
2623 | comedi_proc_cleanup(); | |
2624 | } | |
2625 | module_exit(comedi_cleanup); | |
2626 | ||
a5787824 HS |
2627 | MODULE_AUTHOR("http://www.comedi.org"); |
2628 | MODULE_DESCRIPTION("Comedi core module"); | |
2629 | MODULE_LICENSE("GPL"); |