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; | |
5660e742 | 58 | EXPORT_SYMBOL_GPL(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 | |
5b7dba1b | 84 | static DEFINE_MUTEX(comedi_board_minor_table_lock); |
cb6b79de | 85 | static struct comedi_device |
5b7dba1b IA |
86 | *comedi_board_minor_table[COMEDI_NUM_BOARD_MINORS]; |
87 | ||
88 | static DEFINE_MUTEX(comedi_subdevice_minor_table_lock); | |
89 | /* Note: indexed by minor - COMEDI_NUM_BOARD_MINORS. */ | |
bd5b4173 | 90 | static struct comedi_subdevice |
5b7dba1b | 91 | *comedi_subdevice_minor_table[COMEDI_NUM_SUBDEVICE_MINORS]; |
476b8477 | 92 | |
d9740a03 IA |
93 | static struct class *comedi_class; |
94 | static struct cdev comedi_cdev; | |
95 | ||
96 | static void comedi_device_init(struct comedi_device *dev) | |
97 | { | |
98 | spin_lock_init(&dev->spinlock); | |
99 | mutex_init(&dev->mutex); | |
100 | dev->minor = -1; | |
101 | } | |
102 | ||
103 | static void comedi_device_cleanup(struct comedi_device *dev) | |
104 | { | |
105 | struct module *driver_module = NULL; | |
106 | ||
107 | if (dev == NULL) | |
108 | return; | |
109 | mutex_lock(&dev->mutex); | |
110 | if (dev->attached) | |
111 | driver_module = dev->driver->module; | |
112 | comedi_device_detach(dev); | |
113 | while (dev->use_count > 0) { | |
114 | if (driver_module) | |
115 | module_put(driver_module); | |
116 | module_put(THIS_MODULE); | |
117 | dev->use_count--; | |
118 | } | |
119 | mutex_unlock(&dev->mutex); | |
120 | mutex_destroy(&dev->mutex); | |
121 | } | |
122 | ||
db210da2 IA |
123 | static bool comedi_clear_board_dev(struct comedi_device *dev) |
124 | { | |
125 | unsigned int i = dev->minor; | |
126 | bool cleared = false; | |
127 | ||
128 | mutex_lock(&comedi_board_minor_table_lock); | |
129 | if (dev == comedi_board_minor_table[i]) { | |
130 | comedi_board_minor_table[i] = NULL; | |
131 | cleared = true; | |
132 | } | |
133 | mutex_unlock(&comedi_board_minor_table_lock); | |
134 | return cleared; | |
135 | } | |
136 | ||
cb6b79de | 137 | static struct comedi_device *comedi_clear_board_minor(unsigned minor) |
d9740a03 | 138 | { |
cb6b79de | 139 | struct comedi_device *dev; |
d9740a03 | 140 | |
5b7dba1b | 141 | mutex_lock(&comedi_board_minor_table_lock); |
cb6b79de | 142 | dev = comedi_board_minor_table[minor]; |
5b7dba1b IA |
143 | comedi_board_minor_table[minor] = NULL; |
144 | mutex_unlock(&comedi_board_minor_table_lock); | |
cb6b79de | 145 | return dev; |
d9740a03 IA |
146 | } |
147 | ||
cb6b79de | 148 | static void comedi_free_board_dev(struct comedi_device *dev) |
d9740a03 | 149 | { |
cb6b79de IA |
150 | if (dev) { |
151 | if (dev->class_dev) { | |
152 | device_destroy(comedi_class, | |
153 | MKDEV(COMEDI_MAJOR, dev->minor)); | |
d9740a03 | 154 | } |
cb6b79de IA |
155 | comedi_device_cleanup(dev); |
156 | kfree(dev); | |
d9740a03 IA |
157 | } |
158 | } | |
8ab4ed6e | 159 | |
bd5b4173 IA |
160 | static struct comedi_subdevice |
161 | *comedi_subdevice_from_minor(unsigned minor) | |
5b7dba1b | 162 | { |
bd5b4173 | 163 | struct comedi_subdevice *s; |
5b7dba1b IA |
164 | unsigned int i = minor - COMEDI_NUM_BOARD_MINORS; |
165 | ||
166 | BUG_ON(i >= COMEDI_NUM_SUBDEVICE_MINORS); | |
167 | mutex_lock(&comedi_subdevice_minor_table_lock); | |
bd5b4173 | 168 | s = comedi_subdevice_minor_table[i]; |
5b7dba1b | 169 | mutex_unlock(&comedi_subdevice_minor_table_lock); |
bd5b4173 | 170 | return s; |
5b7dba1b IA |
171 | } |
172 | ||
f3abc831 IA |
173 | static struct comedi_device *comedi_dev_from_board_minor(unsigned minor) |
174 | { | |
cb6b79de | 175 | struct comedi_device *dev; |
f3abc831 | 176 | |
dac59de2 IA |
177 | BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS); |
178 | mutex_lock(&comedi_board_minor_table_lock); | |
cb6b79de | 179 | dev = comedi_board_minor_table[minor]; |
dac59de2 | 180 | mutex_unlock(&comedi_board_minor_table_lock); |
cb6b79de | 181 | return dev; |
f3abc831 IA |
182 | } |
183 | ||
184 | static struct comedi_device *comedi_dev_from_subdevice_minor(unsigned minor) | |
185 | { | |
bd5b4173 | 186 | struct comedi_subdevice *s; |
f3abc831 | 187 | |
bd5b4173 IA |
188 | s = comedi_subdevice_from_minor(minor); |
189 | return s ? s->device : NULL; | |
f3abc831 IA |
190 | } |
191 | ||
ba1bcf6f IA |
192 | struct comedi_device *comedi_dev_from_minor(unsigned minor) |
193 | { | |
f3abc831 IA |
194 | if (minor < COMEDI_NUM_BOARD_MINORS) |
195 | return comedi_dev_from_board_minor(minor); | |
196 | else | |
197 | return comedi_dev_from_subdevice_minor(minor); | |
ba1bcf6f | 198 | } |
85104e9b HS |
199 | EXPORT_SYMBOL_GPL(comedi_dev_from_minor); |
200 | ||
43bd33f2 | 201 | static struct comedi_subdevice * |
da56fdc6 | 202 | comedi_read_subdevice(const struct comedi_device *dev, unsigned int minor) |
43bd33f2 | 203 | { |
bd5b4173 | 204 | struct comedi_subdevice *s; |
da56fdc6 IA |
205 | |
206 | if (minor >= COMEDI_NUM_BOARD_MINORS) { | |
bd5b4173 IA |
207 | s = comedi_subdevice_from_minor(minor); |
208 | if (!s || s->device != dev) | |
da56fdc6 | 209 | return NULL; |
bd5b4173 IA |
210 | if (s->subdev_flags & SDF_CMD_READ) |
211 | return s; | |
da56fdc6 IA |
212 | } |
213 | return dev->read_subdev; | |
43bd33f2 HS |
214 | } |
215 | ||
216 | static struct comedi_subdevice * | |
da56fdc6 | 217 | comedi_write_subdevice(const struct comedi_device *dev, unsigned int minor) |
43bd33f2 | 218 | { |
bd5b4173 | 219 | struct comedi_subdevice *s; |
da56fdc6 IA |
220 | |
221 | if (minor >= COMEDI_NUM_BOARD_MINORS) { | |
bd5b4173 IA |
222 | s = comedi_subdevice_from_minor(minor); |
223 | if (!s || s->device != dev) | |
da56fdc6 | 224 | return NULL; |
bd5b4173 IA |
225 | if (s->subdev_flags & SDF_CMD_WRITE) |
226 | return s; | |
da56fdc6 IA |
227 | } |
228 | return dev->write_subdev; | |
43bd33f2 HS |
229 | } |
230 | ||
883db3d9 FMH |
231 | static int resize_async_buffer(struct comedi_device *dev, |
232 | struct comedi_subdevice *s, | |
a5011a26 HS |
233 | struct comedi_async *async, unsigned new_size) |
234 | { | |
235 | int retval; | |
236 | ||
237 | if (new_size > async->max_bufsize) | |
238 | return -EPERM; | |
239 | ||
240 | if (s->busy) { | |
241 | DPRINTK("subdevice is busy, cannot resize buffer\n"); | |
242 | return -EBUSY; | |
243 | } | |
244 | if (async->mmap_count) { | |
245 | DPRINTK("subdevice is mmapped, cannot resize buffer\n"); | |
246 | return -EBUSY; | |
247 | } | |
248 | ||
a5011a26 HS |
249 | /* make sure buffer is an integral number of pages |
250 | * (we round up) */ | |
251 | new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK; | |
252 | ||
253 | retval = comedi_buf_alloc(dev, s, new_size); | |
254 | if (retval < 0) | |
255 | return retval; | |
256 | ||
257 | if (s->buf_change) { | |
258 | retval = s->buf_change(dev, s, new_size); | |
259 | if (retval < 0) | |
260 | return retval; | |
261 | } | |
262 | ||
263 | DPRINTK("comedi%i subd %d buffer resized to %i bytes\n", | |
90a35c15 | 264 | dev->minor, s->index, async->prealloc_bufsz); |
a5011a26 HS |
265 | return 0; |
266 | } | |
267 | ||
268 | /* sysfs attribute files */ | |
269 | ||
7a4e5a9f | 270 | static ssize_t show_max_read_buffer_kb(struct device *csdev, |
a5011a26 HS |
271 | struct device_attribute *attr, char *buf) |
272 | { | |
c88db469 | 273 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
274 | struct comedi_device *dev; |
275 | struct comedi_subdevice *s; | |
72fd9fac | 276 | unsigned int size = 0; |
a5011a26 | 277 | |
5e04c254 IA |
278 | dev = comedi_dev_from_minor(minor); |
279 | if (!dev) | |
c88db469 IA |
280 | return -ENODEV; |
281 | ||
7f4656c5 | 282 | mutex_lock(&dev->mutex); |
da56fdc6 | 283 | s = comedi_read_subdevice(dev, minor); |
72fd9fac HS |
284 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
285 | size = s->async->max_bufsize / 1024; | |
7f4656c5 | 286 | mutex_unlock(&dev->mutex); |
a5011a26 | 287 | |
72fd9fac | 288 | return snprintf(buf, PAGE_SIZE, "%i\n", size); |
a5011a26 HS |
289 | } |
290 | ||
7a4e5a9f | 291 | static ssize_t store_max_read_buffer_kb(struct device *csdev, |
a5011a26 HS |
292 | struct device_attribute *attr, |
293 | const char *buf, size_t count) | |
294 | { | |
c88db469 | 295 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
296 | struct comedi_device *dev; |
297 | struct comedi_subdevice *s; | |
72fd9fac HS |
298 | unsigned int size; |
299 | int err; | |
300 | ||
301 | err = kstrtouint(buf, 10, &size); | |
302 | if (err) | |
303 | return err; | |
304 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 305 | return -EINVAL; |
72fd9fac | 306 | size *= 1024; |
a5011a26 | 307 | |
5e04c254 IA |
308 | dev = comedi_dev_from_minor(minor); |
309 | if (!dev) | |
c88db469 IA |
310 | return -ENODEV; |
311 | ||
7f4656c5 | 312 | mutex_lock(&dev->mutex); |
da56fdc6 | 313 | s = comedi_read_subdevice(dev, minor); |
72fd9fac HS |
314 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
315 | s->async->max_bufsize = size; | |
316 | else | |
317 | err = -EINVAL; | |
7f4656c5 | 318 | mutex_unlock(&dev->mutex); |
a5011a26 | 319 | |
72fd9fac | 320 | return err ? err : count; |
a5011a26 HS |
321 | } |
322 | ||
7a4e5a9f | 323 | static ssize_t show_read_buffer_kb(struct device *csdev, |
a5011a26 HS |
324 | struct device_attribute *attr, char *buf) |
325 | { | |
c88db469 | 326 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
327 | struct comedi_device *dev; |
328 | struct comedi_subdevice *s; | |
72fd9fac | 329 | unsigned int size = 0; |
a5011a26 | 330 | |
5e04c254 IA |
331 | dev = comedi_dev_from_minor(minor); |
332 | if (!dev) | |
c88db469 IA |
333 | return -ENODEV; |
334 | ||
7f4656c5 | 335 | mutex_lock(&dev->mutex); |
da56fdc6 | 336 | s = comedi_read_subdevice(dev, minor); |
72fd9fac HS |
337 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
338 | size = s->async->prealloc_bufsz / 1024; | |
7f4656c5 | 339 | mutex_unlock(&dev->mutex); |
a5011a26 | 340 | |
72fd9fac | 341 | return snprintf(buf, PAGE_SIZE, "%i\n", size); |
a5011a26 HS |
342 | } |
343 | ||
7a4e5a9f | 344 | static ssize_t store_read_buffer_kb(struct device *csdev, |
a5011a26 HS |
345 | struct device_attribute *attr, |
346 | const char *buf, size_t count) | |
347 | { | |
c88db469 | 348 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
349 | struct comedi_device *dev; |
350 | struct comedi_subdevice *s; | |
72fd9fac HS |
351 | unsigned int size; |
352 | int err; | |
353 | ||
354 | err = kstrtouint(buf, 10, &size); | |
355 | if (err) | |
356 | return err; | |
357 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 358 | return -EINVAL; |
72fd9fac | 359 | size *= 1024; |
a5011a26 | 360 | |
5e04c254 IA |
361 | dev = comedi_dev_from_minor(minor); |
362 | if (!dev) | |
c88db469 IA |
363 | return -ENODEV; |
364 | ||
7f4656c5 | 365 | mutex_lock(&dev->mutex); |
da56fdc6 | 366 | s = comedi_read_subdevice(dev, minor); |
72fd9fac | 367 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
7f4656c5 | 368 | err = resize_async_buffer(dev, s, s->async, size); |
72fd9fac HS |
369 | else |
370 | err = -EINVAL; | |
7f4656c5 | 371 | mutex_unlock(&dev->mutex); |
a5011a26 | 372 | |
72fd9fac | 373 | return err ? err : count; |
a5011a26 | 374 | } |
883db3d9 | 375 | |
7a4e5a9f | 376 | static ssize_t show_max_write_buffer_kb(struct device *csdev, |
a5011a26 HS |
377 | struct device_attribute *attr, |
378 | char *buf) | |
379 | { | |
c88db469 | 380 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
381 | struct comedi_device *dev; |
382 | struct comedi_subdevice *s; | |
72fd9fac | 383 | unsigned int size = 0; |
a5011a26 | 384 | |
5e04c254 IA |
385 | dev = comedi_dev_from_minor(minor); |
386 | if (!dev) | |
c88db469 IA |
387 | return -ENODEV; |
388 | ||
7f4656c5 | 389 | mutex_lock(&dev->mutex); |
da56fdc6 | 390 | s = comedi_write_subdevice(dev, minor); |
72fd9fac HS |
391 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
392 | size = s->async->max_bufsize / 1024; | |
7f4656c5 | 393 | mutex_unlock(&dev->mutex); |
a5011a26 | 394 | |
72fd9fac | 395 | return snprintf(buf, PAGE_SIZE, "%i\n", size); |
a5011a26 HS |
396 | } |
397 | ||
7a4e5a9f | 398 | static ssize_t store_max_write_buffer_kb(struct device *csdev, |
a5011a26 HS |
399 | struct device_attribute *attr, |
400 | const char *buf, size_t count) | |
401 | { | |
c88db469 | 402 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
403 | struct comedi_device *dev; |
404 | struct comedi_subdevice *s; | |
72fd9fac HS |
405 | unsigned int size; |
406 | int err; | |
407 | ||
408 | err = kstrtouint(buf, 10, &size); | |
409 | if (err) | |
410 | return err; | |
411 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 412 | return -EINVAL; |
72fd9fac | 413 | size *= 1024; |
a5011a26 | 414 | |
5e04c254 IA |
415 | dev = comedi_dev_from_minor(minor); |
416 | if (!dev) | |
c88db469 IA |
417 | return -ENODEV; |
418 | ||
7f4656c5 | 419 | mutex_lock(&dev->mutex); |
da56fdc6 | 420 | s = comedi_write_subdevice(dev, minor); |
72fd9fac HS |
421 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
422 | s->async->max_bufsize = size; | |
423 | else | |
424 | err = -EINVAL; | |
7f4656c5 | 425 | mutex_unlock(&dev->mutex); |
a5011a26 | 426 | |
72fd9fac | 427 | return err ? err : count; |
a5011a26 HS |
428 | } |
429 | ||
7a4e5a9f | 430 | static ssize_t show_write_buffer_kb(struct device *csdev, |
a5011a26 HS |
431 | struct device_attribute *attr, char *buf) |
432 | { | |
c88db469 | 433 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
434 | struct comedi_device *dev; |
435 | struct comedi_subdevice *s; | |
72fd9fac | 436 | unsigned int size = 0; |
a5011a26 | 437 | |
5e04c254 IA |
438 | dev = comedi_dev_from_minor(minor); |
439 | if (!dev) | |
c88db469 IA |
440 | return -ENODEV; |
441 | ||
7f4656c5 | 442 | mutex_lock(&dev->mutex); |
da56fdc6 | 443 | s = comedi_write_subdevice(dev, minor); |
72fd9fac HS |
444 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
445 | size = s->async->prealloc_bufsz / 1024; | |
7f4656c5 | 446 | mutex_unlock(&dev->mutex); |
a5011a26 | 447 | |
72fd9fac | 448 | return snprintf(buf, PAGE_SIZE, "%i\n", size); |
a5011a26 HS |
449 | } |
450 | ||
7a4e5a9f | 451 | static ssize_t store_write_buffer_kb(struct device *csdev, |
a5011a26 HS |
452 | struct device_attribute *attr, |
453 | const char *buf, size_t count) | |
454 | { | |
c88db469 | 455 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
456 | struct comedi_device *dev; |
457 | struct comedi_subdevice *s; | |
72fd9fac HS |
458 | unsigned int size; |
459 | int err; | |
460 | ||
461 | err = kstrtouint(buf, 10, &size); | |
462 | if (err) | |
463 | return err; | |
464 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 465 | return -EINVAL; |
72fd9fac | 466 | size *= 1024; |
a5011a26 | 467 | |
5e04c254 IA |
468 | dev = comedi_dev_from_minor(minor); |
469 | if (!dev) | |
c88db469 IA |
470 | return -ENODEV; |
471 | ||
7f4656c5 | 472 | mutex_lock(&dev->mutex); |
da56fdc6 | 473 | s = comedi_write_subdevice(dev, minor); |
72fd9fac | 474 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
7f4656c5 | 475 | err = resize_async_buffer(dev, s, s->async, size); |
72fd9fac HS |
476 | else |
477 | err = -EINVAL; | |
7f4656c5 | 478 | mutex_unlock(&dev->mutex); |
a5011a26 | 479 | |
72fd9fac | 480 | return err ? err : count; |
a5011a26 HS |
481 | } |
482 | ||
fb60367d HS |
483 | static struct device_attribute comedi_dev_attrs[] = { |
484 | __ATTR(max_read_buffer_kb, S_IRUGO | S_IWUSR, | |
485 | show_max_read_buffer_kb, store_max_read_buffer_kb), | |
486 | __ATTR(read_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP, | |
487 | show_read_buffer_kb, store_read_buffer_kb), | |
488 | __ATTR(max_write_buffer_kb, S_IRUGO | S_IWUSR, | |
489 | show_max_write_buffer_kb, store_max_write_buffer_kb), | |
490 | __ATTR(write_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP, | |
491 | show_write_buffer_kb, store_write_buffer_kb), | |
492 | __ATTR_NULL | |
a5011a26 | 493 | }; |
ed9eccbe | 494 | |
2aae0076 HS |
495 | static void comedi_set_subdevice_runflags(struct comedi_subdevice *s, |
496 | unsigned mask, unsigned bits) | |
497 | { | |
498 | unsigned long flags; | |
499 | ||
500 | spin_lock_irqsave(&s->spin_lock, flags); | |
501 | s->runflags &= ~mask; | |
502 | s->runflags |= (bits & mask); | |
503 | spin_unlock_irqrestore(&s->spin_lock, flags); | |
504 | } | |
505 | ||
ade1764f | 506 | static unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s) |
74120719 HS |
507 | { |
508 | unsigned long flags; | |
509 | unsigned runflags; | |
510 | ||
511 | spin_lock_irqsave(&s->spin_lock, flags); | |
512 | runflags = s->runflags; | |
513 | spin_unlock_irqrestore(&s->spin_lock, flags); | |
514 | return runflags; | |
515 | } | |
74120719 | 516 | |
e0dac318 HS |
517 | bool comedi_is_subdevice_running(struct comedi_subdevice *s) |
518 | { | |
519 | unsigned runflags = comedi_get_subdevice_runflags(s); | |
520 | ||
521 | return (runflags & SRF_RUNNING) ? true : false; | |
522 | } | |
523 | EXPORT_SYMBOL_GPL(comedi_is_subdevice_running); | |
524 | ||
c098c21a HS |
525 | static bool comedi_is_subdevice_in_error(struct comedi_subdevice *s) |
526 | { | |
527 | unsigned runflags = comedi_get_subdevice_runflags(s); | |
528 | ||
529 | return (runflags & SRF_ERROR) ? true : false; | |
530 | } | |
531 | ||
9682e28c HS |
532 | static bool comedi_is_subdevice_idle(struct comedi_subdevice *s) |
533 | { | |
534 | unsigned runflags = comedi_get_subdevice_runflags(s); | |
535 | ||
536 | return (runflags & (SRF_ERROR | SRF_RUNNING)) ? false : true; | |
537 | } | |
538 | ||
2aae0076 HS |
539 | /* |
540 | This function restores a subdevice to an idle state. | |
541 | */ | |
542 | static void do_become_nonbusy(struct comedi_device *dev, | |
543 | struct comedi_subdevice *s) | |
544 | { | |
545 | struct comedi_async *async = s->async; | |
546 | ||
547 | comedi_set_subdevice_runflags(s, SRF_RUNNING, 0); | |
548 | if (async) { | |
61c9fb0e | 549 | comedi_buf_reset(async); |
2aae0076 HS |
550 | async->inttrig = NULL; |
551 | kfree(async->cmd.chanlist); | |
552 | async->cmd.chanlist = NULL; | |
553 | } else { | |
554 | dev_err(dev->class_dev, | |
555 | "BUG: (?) do_become_nonbusy called with async=NULL\n"); | |
556 | } | |
557 | ||
558 | s->busy = NULL; | |
559 | } | |
560 | ||
561 | static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s) | |
562 | { | |
563 | int ret = 0; | |
564 | ||
f0124630 | 565 | if (comedi_is_subdevice_running(s) && s->cancel) |
2aae0076 HS |
566 | ret = s->cancel(dev, s); |
567 | ||
568 | do_become_nonbusy(dev, s); | |
569 | ||
570 | return ret; | |
571 | } | |
572 | ||
573 | static int is_device_busy(struct comedi_device *dev) | |
574 | { | |
575 | struct comedi_subdevice *s; | |
576 | int i; | |
577 | ||
578 | if (!dev->attached) | |
579 | return 0; | |
580 | ||
581 | for (i = 0; i < dev->n_subdevices; i++) { | |
582 | s = &dev->subdevices[i]; | |
583 | if (s->busy) | |
584 | return 1; | |
585 | if (s->async && s->async->mmap_count) | |
586 | return 1; | |
587 | } | |
588 | ||
589 | return 0; | |
590 | } | |
591 | ||
ed9eccbe DS |
592 | /* |
593 | COMEDI_DEVCONFIG | |
594 | device config ioctl | |
595 | ||
596 | arg: | |
597 | pointer to devconfig structure | |
598 | ||
599 | reads: | |
600 | devconfig structure at arg | |
601 | ||
602 | writes: | |
603 | none | |
604 | */ | |
0a85b6f0 | 605 | static int do_devconfig_ioctl(struct comedi_device *dev, |
92d0127c | 606 | struct comedi_devconfig __user *arg) |
ed9eccbe | 607 | { |
0707bb04 | 608 | struct comedi_devconfig it; |
ed9eccbe DS |
609 | |
610 | if (!capable(CAP_SYS_ADMIN)) | |
611 | return -EPERM; | |
612 | ||
613 | if (arg == NULL) { | |
614 | if (is_device_busy(dev)) | |
615 | return -EBUSY; | |
476b8477 | 616 | if (dev->attached) { |
ed9eccbe DS |
617 | struct module *driver_module = dev->driver->module; |
618 | comedi_device_detach(dev); | |
619 | module_put(driver_module); | |
620 | } | |
621 | return 0; | |
622 | } | |
623 | ||
bc252fd1 | 624 | if (copy_from_user(&it, arg, sizeof(it))) |
ed9eccbe DS |
625 | return -EFAULT; |
626 | ||
627 | it.board_name[COMEDI_NAMELEN - 1] = 0; | |
628 | ||
d1843132 HS |
629 | if (it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) { |
630 | dev_warn(dev->class_dev, | |
631 | "comedi_config --init_data is deprecated\n"); | |
632 | return -EINVAL; | |
ed9eccbe DS |
633 | } |
634 | ||
8ab4ed6e IA |
635 | if (dev->minor >= comedi_num_legacy_minors) |
636 | /* don't re-use dynamically allocated comedi devices */ | |
637 | return -EBUSY; | |
638 | ||
b2a644b4 IA |
639 | /* This increments the driver module count on success. */ |
640 | return comedi_device_attach(dev, &it); | |
ed9eccbe DS |
641 | } |
642 | ||
643 | /* | |
644 | COMEDI_BUFCONFIG | |
645 | buffer configuration ioctl | |
646 | ||
647 | arg: | |
648 | pointer to bufconfig structure | |
649 | ||
650 | reads: | |
651 | bufconfig at arg | |
652 | ||
653 | writes: | |
654 | modified bufconfig at arg | |
655 | ||
656 | */ | |
92d0127c GKH |
657 | static int do_bufconfig_ioctl(struct comedi_device *dev, |
658 | struct comedi_bufconfig __user *arg) | |
ed9eccbe | 659 | { |
be6aba4a | 660 | struct comedi_bufconfig bc; |
d163679c | 661 | struct comedi_async *async; |
34c43922 | 662 | struct comedi_subdevice *s; |
883db3d9 | 663 | int retval = 0; |
ed9eccbe | 664 | |
bc252fd1 | 665 | if (copy_from_user(&bc, arg, sizeof(bc))) |
ed9eccbe DS |
666 | return -EFAULT; |
667 | ||
668 | if (bc.subdevice >= dev->n_subdevices || bc.subdevice < 0) | |
669 | return -EINVAL; | |
670 | ||
b077f2cd | 671 | s = &dev->subdevices[bc.subdevice]; |
ed9eccbe DS |
672 | async = s->async; |
673 | ||
674 | if (!async) { | |
675 | DPRINTK("subdevice does not have async capability\n"); | |
676 | bc.size = 0; | |
677 | bc.maximum_size = 0; | |
678 | goto copyback; | |
679 | } | |
680 | ||
681 | if (bc.maximum_size) { | |
682 | if (!capable(CAP_SYS_ADMIN)) | |
683 | return -EPERM; | |
684 | ||
685 | async->max_bufsize = bc.maximum_size; | |
686 | } | |
687 | ||
688 | if (bc.size) { | |
883db3d9 FMH |
689 | retval = resize_async_buffer(dev, s, async, bc.size); |
690 | if (retval < 0) | |
691 | return retval; | |
ed9eccbe DS |
692 | } |
693 | ||
694 | bc.size = async->prealloc_bufsz; | |
695 | bc.maximum_size = async->max_bufsize; | |
696 | ||
476b8477 | 697 | copyback: |
bc252fd1 | 698 | if (copy_to_user(arg, &bc, sizeof(bc))) |
ed9eccbe DS |
699 | return -EFAULT; |
700 | ||
701 | return 0; | |
702 | } | |
703 | ||
704 | /* | |
705 | COMEDI_DEVINFO | |
706 | device info ioctl | |
707 | ||
708 | arg: | |
709 | pointer to devinfo structure | |
710 | ||
711 | reads: | |
712 | none | |
713 | ||
714 | writes: | |
715 | devinfo structure | |
716 | ||
717 | */ | |
0a85b6f0 | 718 | static int do_devinfo_ioctl(struct comedi_device *dev, |
92d0127c GKH |
719 | struct comedi_devinfo __user *arg, |
720 | struct file *file) | |
ed9eccbe | 721 | { |
6131ffaa | 722 | const unsigned minor = iminor(file_inode(file)); |
0e700923 HS |
723 | struct comedi_subdevice *s; |
724 | struct comedi_devinfo devinfo; | |
ed9eccbe DS |
725 | |
726 | memset(&devinfo, 0, sizeof(devinfo)); | |
727 | ||
728 | /* fill devinfo structure */ | |
729 | devinfo.version_code = COMEDI_VERSION_CODE; | |
730 | devinfo.n_subdevs = dev->n_subdevices; | |
819cbb12 VK |
731 | strlcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN); |
732 | strlcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN); | |
ed9eccbe | 733 | |
da56fdc6 | 734 | s = comedi_read_subdevice(dev, minor); |
0e700923 | 735 | if (s) |
90a35c15 | 736 | devinfo.read_subdevice = s->index; |
476b8477 | 737 | else |
ed9eccbe | 738 | devinfo.read_subdevice = -1; |
476b8477 | 739 | |
da56fdc6 | 740 | s = comedi_write_subdevice(dev, minor); |
0e700923 | 741 | if (s) |
90a35c15 | 742 | devinfo.write_subdevice = s->index; |
476b8477 | 743 | else |
ed9eccbe | 744 | devinfo.write_subdevice = -1; |
ed9eccbe | 745 | |
bc252fd1 | 746 | if (copy_to_user(arg, &devinfo, sizeof(devinfo))) |
ed9eccbe DS |
747 | return -EFAULT; |
748 | ||
749 | return 0; | |
750 | } | |
751 | ||
752 | /* | |
753 | COMEDI_SUBDINFO | |
754 | subdevice info ioctl | |
755 | ||
756 | arg: | |
757 | pointer to array of subdevice info structures | |
758 | ||
759 | reads: | |
760 | none | |
761 | ||
762 | writes: | |
763 | array of subdevice info structures at arg | |
764 | ||
765 | */ | |
0a85b6f0 | 766 | static int do_subdinfo_ioctl(struct comedi_device *dev, |
92d0127c | 767 | struct comedi_subdinfo __user *arg, void *file) |
ed9eccbe DS |
768 | { |
769 | int ret, i; | |
bd52efbb | 770 | struct comedi_subdinfo *tmp, *us; |
34c43922 | 771 | struct comedi_subdevice *s; |
ed9eccbe | 772 | |
bc252fd1 | 773 | tmp = kcalloc(dev->n_subdevices, sizeof(*tmp), GFP_KERNEL); |
ed9eccbe DS |
774 | if (!tmp) |
775 | return -ENOMEM; | |
776 | ||
777 | /* fill subdinfo structs */ | |
778 | for (i = 0; i < dev->n_subdevices; i++) { | |
b077f2cd | 779 | s = &dev->subdevices[i]; |
ed9eccbe DS |
780 | us = tmp + i; |
781 | ||
782 | us->type = s->type; | |
783 | us->n_chan = s->n_chan; | |
784 | us->subd_flags = s->subdev_flags; | |
f0124630 | 785 | if (comedi_is_subdevice_running(s)) |
ed9eccbe DS |
786 | us->subd_flags |= SDF_RUNNING; |
787 | #define TIMER_nanosec 5 /* backwards compatibility */ | |
788 | us->timer_type = TIMER_nanosec; | |
789 | us->len_chanlist = s->len_chanlist; | |
790 | us->maxdata = s->maxdata; | |
791 | if (s->range_table) { | |
792 | us->range_type = | |
476b8477 | 793 | (i << 24) | (0 << 16) | (s->range_table->length); |
ed9eccbe DS |
794 | } else { |
795 | us->range_type = 0; /* XXX */ | |
796 | } | |
797 | us->flags = s->flags; | |
798 | ||
799 | if (s->busy) | |
800 | us->subd_flags |= SDF_BUSY; | |
801 | if (s->busy == file) | |
802 | us->subd_flags |= SDF_BUSY_OWNER; | |
803 | if (s->lock) | |
804 | us->subd_flags |= SDF_LOCKED; | |
805 | if (s->lock == file) | |
806 | us->subd_flags |= SDF_LOCK_OWNER; | |
807 | if (!s->maxdata && s->maxdata_list) | |
808 | us->subd_flags |= SDF_MAXDATA; | |
809 | if (s->flaglist) | |
810 | us->subd_flags |= SDF_FLAGS; | |
811 | if (s->range_table_list) | |
812 | us->subd_flags |= SDF_RANGETYPE; | |
813 | if (s->do_cmd) | |
814 | us->subd_flags |= SDF_CMD; | |
815 | ||
816 | if (s->insn_bits != &insn_inval) | |
817 | us->insn_bits_support = COMEDI_SUPPORTED; | |
818 | else | |
819 | us->insn_bits_support = COMEDI_UNSUPPORTED; | |
820 | ||
821 | us->settling_time_0 = s->settling_time_0; | |
822 | } | |
823 | ||
bc252fd1 | 824 | ret = copy_to_user(arg, tmp, dev->n_subdevices * sizeof(*tmp)); |
ed9eccbe DS |
825 | |
826 | kfree(tmp); | |
827 | ||
828 | return ret ? -EFAULT : 0; | |
829 | } | |
830 | ||
831 | /* | |
832 | COMEDI_CHANINFO | |
833 | subdevice info ioctl | |
834 | ||
835 | arg: | |
836 | pointer to chaninfo structure | |
837 | ||
838 | reads: | |
839 | chaninfo structure at arg | |
840 | ||
841 | writes: | |
842 | arrays at elements of chaninfo structure | |
843 | ||
844 | */ | |
0a85b6f0 | 845 | static int do_chaninfo_ioctl(struct comedi_device *dev, |
92d0127c | 846 | struct comedi_chaninfo __user *arg) |
ed9eccbe | 847 | { |
34c43922 | 848 | struct comedi_subdevice *s; |
a18b416d | 849 | struct comedi_chaninfo it; |
ed9eccbe | 850 | |
bc252fd1 | 851 | if (copy_from_user(&it, arg, sizeof(it))) |
ed9eccbe DS |
852 | return -EFAULT; |
853 | ||
854 | if (it.subdev >= dev->n_subdevices) | |
855 | return -EINVAL; | |
b077f2cd | 856 | s = &dev->subdevices[it.subdev]; |
ed9eccbe DS |
857 | |
858 | if (it.maxdata_list) { | |
859 | if (s->maxdata || !s->maxdata_list) | |
860 | return -EINVAL; | |
861 | if (copy_to_user(it.maxdata_list, s->maxdata_list, | |
790c5541 | 862 | s->n_chan * sizeof(unsigned int))) |
ed9eccbe DS |
863 | return -EFAULT; |
864 | } | |
865 | ||
866 | if (it.flaglist) { | |
867 | if (!s->flaglist) | |
868 | return -EINVAL; | |
869 | if (copy_to_user(it.flaglist, s->flaglist, | |
476b8477 | 870 | s->n_chan * sizeof(unsigned int))) |
ed9eccbe DS |
871 | return -EFAULT; |
872 | } | |
873 | ||
874 | if (it.rangelist) { | |
875 | int i; | |
876 | ||
877 | if (!s->range_table_list) | |
878 | return -EINVAL; | |
879 | for (i = 0; i < s->n_chan; i++) { | |
880 | int x; | |
881 | ||
882 | x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) | | |
476b8477 | 883 | (s->range_table_list[i]->length); |
81604d43 VK |
884 | if (put_user(x, it.rangelist + i)) |
885 | return -EFAULT; | |
ed9eccbe | 886 | } |
476b8477 GKH |
887 | #if 0 |
888 | if (copy_to_user(it.rangelist, s->range_type_list, | |
0a85b6f0 | 889 | s->n_chan * sizeof(unsigned int))) |
476b8477 GKH |
890 | return -EFAULT; |
891 | #endif | |
ed9eccbe DS |
892 | } |
893 | ||
894 | return 0; | |
895 | } | |
896 | ||
897 | /* | |
898 | COMEDI_BUFINFO | |
899 | buffer information ioctl | |
900 | ||
901 | arg: | |
902 | pointer to bufinfo structure | |
903 | ||
904 | reads: | |
905 | bufinfo at arg | |
906 | ||
907 | writes: | |
908 | modified bufinfo at arg | |
909 | ||
910 | */ | |
92d0127c | 911 | static int do_bufinfo_ioctl(struct comedi_device *dev, |
53fa827e | 912 | struct comedi_bufinfo __user *arg, void *file) |
ed9eccbe | 913 | { |
9aa5339a | 914 | struct comedi_bufinfo bi; |
34c43922 | 915 | struct comedi_subdevice *s; |
d163679c | 916 | struct comedi_async *async; |
ed9eccbe | 917 | |
bc252fd1 | 918 | if (copy_from_user(&bi, arg, sizeof(bi))) |
ed9eccbe DS |
919 | return -EFAULT; |
920 | ||
921 | if (bi.subdevice >= dev->n_subdevices || bi.subdevice < 0) | |
922 | return -EINVAL; | |
923 | ||
b077f2cd | 924 | s = &dev->subdevices[bi.subdevice]; |
53fa827e IA |
925 | |
926 | if (s->lock && s->lock != file) | |
927 | return -EACCES; | |
928 | ||
ed9eccbe DS |
929 | async = s->async; |
930 | ||
931 | if (!async) { | |
932 | DPRINTK("subdevice does not have async capability\n"); | |
933 | bi.buf_write_ptr = 0; | |
934 | bi.buf_read_ptr = 0; | |
935 | bi.buf_write_count = 0; | |
936 | bi.buf_read_count = 0; | |
4772c018 IA |
937 | bi.bytes_read = 0; |
938 | bi.bytes_written = 0; | |
ed9eccbe DS |
939 | goto copyback; |
940 | } | |
53fa827e IA |
941 | if (!s->busy) { |
942 | bi.bytes_read = 0; | |
943 | bi.bytes_written = 0; | |
944 | goto copyback_position; | |
945 | } | |
946 | if (s->busy != file) | |
947 | return -EACCES; | |
ed9eccbe DS |
948 | |
949 | if (bi.bytes_read && (s->subdev_flags & SDF_CMD_READ)) { | |
950 | bi.bytes_read = comedi_buf_read_alloc(async, bi.bytes_read); | |
951 | comedi_buf_read_free(async, bi.bytes_read); | |
952 | ||
9682e28c HS |
953 | if (comedi_is_subdevice_idle(s) && |
954 | async->buf_write_count == async->buf_read_count) { | |
ed9eccbe DS |
955 | do_become_nonbusy(dev, s); |
956 | } | |
957 | } | |
958 | ||
959 | if (bi.bytes_written && (s->subdev_flags & SDF_CMD_WRITE)) { | |
960 | bi.bytes_written = | |
476b8477 | 961 | comedi_buf_write_alloc(async, bi.bytes_written); |
ed9eccbe DS |
962 | comedi_buf_write_free(async, bi.bytes_written); |
963 | } | |
964 | ||
53fa827e | 965 | copyback_position: |
ed9eccbe DS |
966 | bi.buf_write_count = async->buf_write_count; |
967 | bi.buf_write_ptr = async->buf_write_ptr; | |
968 | bi.buf_read_count = async->buf_read_count; | |
969 | bi.buf_read_ptr = async->buf_read_ptr; | |
970 | ||
476b8477 | 971 | copyback: |
bc252fd1 | 972 | if (copy_to_user(arg, &bi, sizeof(bi))) |
ed9eccbe DS |
973 | return -EFAULT; |
974 | ||
975 | return 0; | |
976 | } | |
977 | ||
0a85b6f0 MT |
978 | static int check_insn_config_length(struct comedi_insn *insn, |
979 | unsigned int *data) | |
ed9eccbe | 980 | { |
476b8477 GKH |
981 | if (insn->n < 1) |
982 | return -EINVAL; | |
ed9eccbe DS |
983 | |
984 | switch (data[0]) { | |
985 | case INSN_CONFIG_DIO_OUTPUT: | |
986 | case INSN_CONFIG_DIO_INPUT: | |
987 | case INSN_CONFIG_DISARM: | |
988 | case INSN_CONFIG_RESET: | |
989 | if (insn->n == 1) | |
990 | return 0; | |
991 | break; | |
992 | case INSN_CONFIG_ARM: | |
993 | case INSN_CONFIG_DIO_QUERY: | |
994 | case INSN_CONFIG_BLOCK_SIZE: | |
995 | case INSN_CONFIG_FILTER: | |
996 | case INSN_CONFIG_SERIAL_CLOCK: | |
997 | case INSN_CONFIG_BIDIRECTIONAL_DATA: | |
998 | case INSN_CONFIG_ALT_SOURCE: | |
999 | case INSN_CONFIG_SET_COUNTER_MODE: | |
1000 | case INSN_CONFIG_8254_READ_STATUS: | |
1001 | case INSN_CONFIG_SET_ROUTING: | |
1002 | case INSN_CONFIG_GET_ROUTING: | |
1003 | case INSN_CONFIG_GET_PWM_STATUS: | |
1004 | case INSN_CONFIG_PWM_SET_PERIOD: | |
1005 | case INSN_CONFIG_PWM_GET_PERIOD: | |
1006 | if (insn->n == 2) | |
1007 | return 0; | |
1008 | break; | |
1009 | case INSN_CONFIG_SET_GATE_SRC: | |
1010 | case INSN_CONFIG_GET_GATE_SRC: | |
1011 | case INSN_CONFIG_SET_CLOCK_SRC: | |
1012 | case INSN_CONFIG_GET_CLOCK_SRC: | |
1013 | case INSN_CONFIG_SET_OTHER_SRC: | |
1014 | case INSN_CONFIG_GET_COUNTER_STATUS: | |
1015 | case INSN_CONFIG_PWM_SET_H_BRIDGE: | |
1016 | case INSN_CONFIG_PWM_GET_H_BRIDGE: | |
1017 | case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE: | |
1018 | if (insn->n == 3) | |
1019 | return 0; | |
1020 | break; | |
1021 | case INSN_CONFIG_PWM_OUTPUT: | |
1022 | case INSN_CONFIG_ANALOG_TRIG: | |
1023 | if (insn->n == 5) | |
1024 | return 0; | |
1025 | break; | |
b0a2b6d8 IA |
1026 | case INSN_CONFIG_DIGITAL_TRIG: |
1027 | if (insn->n == 6) | |
1028 | return 0; | |
1029 | break; | |
0a85b6f0 MT |
1030 | /* by default we allow the insn since we don't have checks for |
1031 | * all possible cases yet */ | |
ed9eccbe | 1032 | default: |
4f870fe6 IA |
1033 | pr_warn("comedi: No check for data length of config insn id %i is implemented.\n", |
1034 | data[0]); | |
1035 | pr_warn("comedi: Add a check to %s in %s.\n", | |
1036 | __func__, __FILE__); | |
1037 | pr_warn("comedi: Assuming n=%i is correct.\n", insn->n); | |
ed9eccbe | 1038 | return 0; |
ed9eccbe DS |
1039 | } |
1040 | return -EINVAL; | |
1041 | } | |
1042 | ||
0a85b6f0 MT |
1043 | static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn, |
1044 | unsigned int *data, void *file) | |
ed9eccbe | 1045 | { |
34c43922 | 1046 | struct comedi_subdevice *s; |
ed9eccbe DS |
1047 | int ret = 0; |
1048 | int i; | |
1049 | ||
1050 | if (insn->insn & INSN_MASK_SPECIAL) { | |
1051 | /* a non-subdevice instruction */ | |
1052 | ||
1053 | switch (insn->insn) { | |
1054 | case INSN_GTOD: | |
1055 | { | |
1056 | struct timeval tv; | |
1057 | ||
1058 | if (insn->n != 2) { | |
1059 | ret = -EINVAL; | |
1060 | break; | |
1061 | } | |
1062 | ||
1063 | do_gettimeofday(&tv); | |
1064 | data[0] = tv.tv_sec; | |
1065 | data[1] = tv.tv_usec; | |
1066 | ret = 2; | |
1067 | ||
1068 | break; | |
1069 | } | |
1070 | case INSN_WAIT: | |
1071 | if (insn->n != 1 || data[0] >= 100000) { | |
1072 | ret = -EINVAL; | |
1073 | break; | |
1074 | } | |
1075 | udelay(data[0] / 1000); | |
1076 | ret = 1; | |
1077 | break; | |
1078 | case INSN_INTTRIG: | |
1079 | if (insn->n != 1) { | |
1080 | ret = -EINVAL; | |
1081 | break; | |
1082 | } | |
1083 | if (insn->subdev >= dev->n_subdevices) { | |
1084 | DPRINTK("%d not usable subdevice\n", | |
1085 | insn->subdev); | |
1086 | ret = -EINVAL; | |
1087 | break; | |
1088 | } | |
b077f2cd | 1089 | s = &dev->subdevices[insn->subdev]; |
ed9eccbe DS |
1090 | if (!s->async) { |
1091 | DPRINTK("no async\n"); | |
1092 | ret = -EINVAL; | |
1093 | break; | |
1094 | } | |
1095 | if (!s->async->inttrig) { | |
1096 | DPRINTK("no inttrig\n"); | |
1097 | ret = -EAGAIN; | |
1098 | break; | |
1099 | } | |
5d06e3df | 1100 | ret = s->async->inttrig(dev, s, data[0]); |
ed9eccbe DS |
1101 | if (ret >= 0) |
1102 | ret = 1; | |
1103 | break; | |
1104 | default: | |
1105 | DPRINTK("invalid insn\n"); | |
1106 | ret = -EINVAL; | |
1107 | break; | |
1108 | } | |
1109 | } else { | |
1110 | /* a subdevice instruction */ | |
790c5541 | 1111 | unsigned int maxdata; |
ed9eccbe DS |
1112 | |
1113 | if (insn->subdev >= dev->n_subdevices) { | |
1114 | DPRINTK("subdevice %d out of range\n", insn->subdev); | |
1115 | ret = -EINVAL; | |
1116 | goto out; | |
1117 | } | |
b077f2cd | 1118 | s = &dev->subdevices[insn->subdev]; |
ed9eccbe DS |
1119 | |
1120 | if (s->type == COMEDI_SUBD_UNUSED) { | |
1121 | DPRINTK("%d not usable subdevice\n", insn->subdev); | |
1122 | ret = -EIO; | |
1123 | goto out; | |
1124 | } | |
1125 | ||
1126 | /* are we locked? (ioctl lock) */ | |
1127 | if (s->lock && s->lock != file) { | |
1128 | DPRINTK("device locked\n"); | |
1129 | ret = -EACCES; | |
1130 | goto out; | |
1131 | } | |
1132 | ||
0fd0ca75 | 1133 | ret = comedi_check_chanlist(s, 1, &insn->chanspec); |
476b8477 | 1134 | if (ret < 0) { |
ed9eccbe DS |
1135 | ret = -EINVAL; |
1136 | DPRINTK("bad chanspec\n"); | |
1137 | goto out; | |
1138 | } | |
1139 | ||
1140 | if (s->busy) { | |
1141 | ret = -EBUSY; | |
1142 | goto out; | |
1143 | } | |
1144 | /* This looks arbitrary. It is. */ | |
1145 | s->busy = &parse_insn; | |
1146 | switch (insn->insn) { | |
1147 | case INSN_READ: | |
1148 | ret = s->insn_read(dev, s, insn, data); | |
1149 | break; | |
1150 | case INSN_WRITE: | |
1151 | maxdata = s->maxdata_list | |
476b8477 GKH |
1152 | ? s->maxdata_list[CR_CHAN(insn->chanspec)] |
1153 | : s->maxdata; | |
ed9eccbe DS |
1154 | for (i = 0; i < insn->n; ++i) { |
1155 | if (data[i] > maxdata) { | |
1156 | ret = -EINVAL; | |
1157 | DPRINTK("bad data value(s)\n"); | |
1158 | break; | |
1159 | } | |
1160 | } | |
1161 | if (ret == 0) | |
1162 | ret = s->insn_write(dev, s, insn, data); | |
1163 | break; | |
1164 | case INSN_BITS: | |
1165 | if (insn->n != 2) { | |
1166 | ret = -EINVAL; | |
2f644ccf IA |
1167 | } else { |
1168 | /* Most drivers ignore the base channel in | |
1169 | * insn->chanspec. Fix this here if | |
1170 | * the subdevice has <= 32 channels. */ | |
1171 | unsigned int shift; | |
1172 | unsigned int orig_mask; | |
1173 | ||
1174 | orig_mask = data[0]; | |
1175 | if (s->n_chan <= 32) { | |
1176 | shift = CR_CHAN(insn->chanspec); | |
1177 | if (shift > 0) { | |
1178 | insn->chanspec = 0; | |
1179 | data[0] <<= shift; | |
1180 | data[1] <<= shift; | |
1181 | } | |
1182 | } else | |
1183 | shift = 0; | |
1184 | ret = s->insn_bits(dev, s, insn, data); | |
1185 | data[0] = orig_mask; | |
1186 | if (shift > 0) | |
1187 | data[1] >>= shift; | |
ed9eccbe | 1188 | } |
ed9eccbe DS |
1189 | break; |
1190 | case INSN_CONFIG: | |
1191 | ret = check_insn_config_length(insn, data); | |
1192 | if (ret) | |
1193 | break; | |
1194 | ret = s->insn_config(dev, s, insn, data); | |
1195 | break; | |
1196 | default: | |
1197 | ret = -EINVAL; | |
1198 | break; | |
1199 | } | |
1200 | ||
1201 | s->busy = NULL; | |
1202 | } | |
1203 | ||
476b8477 | 1204 | out: |
ed9eccbe DS |
1205 | return ret; |
1206 | } | |
1207 | ||
5b6cbd87 HS |
1208 | /* |
1209 | * COMEDI_INSNLIST | |
1210 | * synchronous instructions | |
1211 | * | |
1212 | * arg: | |
1213 | * pointer to sync cmd structure | |
1214 | * | |
1215 | * reads: | |
1216 | * sync cmd struct at arg | |
1217 | * instruction list | |
1218 | * data (for writes) | |
1219 | * | |
1220 | * writes: | |
1221 | * data (for reads) | |
1222 | */ | |
1223 | /* arbitrary limits */ | |
1224 | #define MAX_SAMPLES 256 | |
1225 | static int do_insnlist_ioctl(struct comedi_device *dev, | |
1226 | struct comedi_insnlist __user *arg, void *file) | |
1227 | { | |
1228 | struct comedi_insnlist insnlist; | |
1229 | struct comedi_insn *insns = NULL; | |
1230 | unsigned int *data = NULL; | |
1231 | int i = 0; | |
1232 | int ret = 0; | |
1233 | ||
1234 | if (copy_from_user(&insnlist, arg, sizeof(insnlist))) | |
1235 | return -EFAULT; | |
1236 | ||
1237 | data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL); | |
1238 | if (!data) { | |
1239 | DPRINTK("kmalloc failed\n"); | |
1240 | ret = -ENOMEM; | |
1241 | goto error; | |
1242 | } | |
1243 | ||
1244 | insns = kcalloc(insnlist.n_insns, sizeof(*insns), GFP_KERNEL); | |
1245 | if (!insns) { | |
1246 | DPRINTK("kmalloc failed\n"); | |
1247 | ret = -ENOMEM; | |
1248 | goto error; | |
1249 | } | |
1250 | ||
1251 | if (copy_from_user(insns, insnlist.insns, | |
1252 | sizeof(*insns) * insnlist.n_insns)) { | |
1253 | DPRINTK("copy_from_user failed\n"); | |
1254 | ret = -EFAULT; | |
1255 | goto error; | |
1256 | } | |
1257 | ||
1258 | for (i = 0; i < insnlist.n_insns; i++) { | |
1259 | if (insns[i].n > MAX_SAMPLES) { | |
1260 | DPRINTK("number of samples too large\n"); | |
1261 | ret = -EINVAL; | |
1262 | goto error; | |
1263 | } | |
1264 | if (insns[i].insn & INSN_MASK_WRITE) { | |
1265 | if (copy_from_user(data, insns[i].data, | |
1266 | insns[i].n * sizeof(unsigned int))) { | |
1267 | DPRINTK("copy_from_user failed\n"); | |
1268 | ret = -EFAULT; | |
1269 | goto error; | |
1270 | } | |
1271 | } | |
1272 | ret = parse_insn(dev, insns + i, data, file); | |
1273 | if (ret < 0) | |
1274 | goto error; | |
1275 | if (insns[i].insn & INSN_MASK_READ) { | |
1276 | if (copy_to_user(insns[i].data, data, | |
1277 | insns[i].n * sizeof(unsigned int))) { | |
1278 | DPRINTK("copy_to_user failed\n"); | |
1279 | ret = -EFAULT; | |
1280 | goto error; | |
1281 | } | |
1282 | } | |
1283 | if (need_resched()) | |
1284 | schedule(); | |
1285 | } | |
1286 | ||
1287 | error: | |
1288 | kfree(insns); | |
1289 | kfree(data); | |
1290 | ||
1291 | if (ret < 0) | |
1292 | return ret; | |
1293 | return i; | |
1294 | } | |
1295 | ||
ed9eccbe | 1296 | /* |
20617f22 PDP |
1297 | * COMEDI_INSN |
1298 | * synchronous instructions | |
ed9eccbe | 1299 | * |
20617f22 PDP |
1300 | * arg: |
1301 | * pointer to insn | |
ed9eccbe | 1302 | * |
20617f22 PDP |
1303 | * reads: |
1304 | * struct comedi_insn struct at arg | |
1305 | * data (for writes) | |
ed9eccbe | 1306 | * |
20617f22 PDP |
1307 | * writes: |
1308 | * data (for reads) | |
ed9eccbe | 1309 | */ |
92d0127c GKH |
1310 | static int do_insn_ioctl(struct comedi_device *dev, |
1311 | struct comedi_insn __user *arg, void *file) | |
ed9eccbe | 1312 | { |
90035c08 | 1313 | struct comedi_insn insn; |
790c5541 | 1314 | unsigned int *data = NULL; |
ed9eccbe DS |
1315 | int ret = 0; |
1316 | ||
790c5541 | 1317 | data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL); |
ed9eccbe DS |
1318 | if (!data) { |
1319 | ret = -ENOMEM; | |
1320 | goto error; | |
1321 | } | |
1322 | ||
bc252fd1 | 1323 | if (copy_from_user(&insn, arg, sizeof(insn))) { |
ed9eccbe DS |
1324 | ret = -EFAULT; |
1325 | goto error; | |
1326 | } | |
1327 | ||
1328 | /* This is where the behavior of insn and insnlist deviate. */ | |
1329 | if (insn.n > MAX_SAMPLES) | |
1330 | insn.n = MAX_SAMPLES; | |
1331 | if (insn.insn & INSN_MASK_WRITE) { | |
21fe2eea M |
1332 | if (copy_from_user(data, |
1333 | insn.data, | |
1334 | insn.n * sizeof(unsigned int))) { | |
ed9eccbe DS |
1335 | ret = -EFAULT; |
1336 | goto error; | |
1337 | } | |
1338 | } | |
1339 | ret = parse_insn(dev, &insn, data, file); | |
1340 | if (ret < 0) | |
1341 | goto error; | |
1342 | if (insn.insn & INSN_MASK_READ) { | |
21fe2eea M |
1343 | if (copy_to_user(insn.data, |
1344 | data, | |
1345 | insn.n * sizeof(unsigned int))) { | |
ed9eccbe DS |
1346 | ret = -EFAULT; |
1347 | goto error; | |
1348 | } | |
1349 | } | |
1350 | ret = insn.n; | |
1351 | ||
476b8477 GKH |
1352 | error: |
1353 | kfree(data); | |
ed9eccbe DS |
1354 | |
1355 | return ret; | |
1356 | } | |
1357 | ||
92d0127c | 1358 | static int do_cmd_ioctl(struct comedi_device *dev, |
cbe01f72 | 1359 | struct comedi_cmd __user *arg, void *file) |
ed9eccbe | 1360 | { |
88bc0574 | 1361 | struct comedi_cmd cmd; |
34c43922 | 1362 | struct comedi_subdevice *s; |
d163679c | 1363 | struct comedi_async *async; |
ed9eccbe | 1364 | int ret = 0; |
95bc359f | 1365 | unsigned int __user *user_chanlist; |
ed9eccbe | 1366 | |
bc252fd1 | 1367 | if (copy_from_user(&cmd, arg, sizeof(cmd))) { |
ed9eccbe DS |
1368 | DPRINTK("bad cmd address\n"); |
1369 | return -EFAULT; | |
1370 | } | |
476b8477 | 1371 | /* save user's chanlist pointer so it can be restored later */ |
95bc359f | 1372 | user_chanlist = (unsigned int __user *)cmd.chanlist; |
ed9eccbe | 1373 | |
88bc0574 HS |
1374 | if (cmd.subdev >= dev->n_subdevices) { |
1375 | DPRINTK("%d no such subdevice\n", cmd.subdev); | |
ed9eccbe DS |
1376 | return -ENODEV; |
1377 | } | |
1378 | ||
88bc0574 | 1379 | s = &dev->subdevices[cmd.subdev]; |
ed9eccbe DS |
1380 | async = s->async; |
1381 | ||
1382 | if (s->type == COMEDI_SUBD_UNUSED) { | |
88bc0574 | 1383 | DPRINTK("%d not valid subdevice\n", cmd.subdev); |
ed9eccbe DS |
1384 | return -EIO; |
1385 | } | |
1386 | ||
1387 | if (!s->do_cmd || !s->do_cmdtest || !s->async) { | |
1388 | DPRINTK("subdevice %i does not support commands\n", | |
88bc0574 | 1389 | cmd.subdev); |
ed9eccbe DS |
1390 | return -EIO; |
1391 | } | |
1392 | ||
1393 | /* are we locked? (ioctl lock) */ | |
1394 | if (s->lock && s->lock != file) { | |
1395 | DPRINTK("subdevice locked\n"); | |
1396 | return -EACCES; | |
1397 | } | |
1398 | ||
1399 | /* are we busy? */ | |
1400 | if (s->busy) { | |
1401 | DPRINTK("subdevice busy\n"); | |
1402 | return -EBUSY; | |
1403 | } | |
ed9eccbe DS |
1404 | |
1405 | /* make sure channel/gain list isn't too long */ | |
88bc0574 | 1406 | if (cmd.chanlist_len > s->len_chanlist) { |
ed9eccbe | 1407 | DPRINTK("channel/gain list too long %u > %d\n", |
88bc0574 | 1408 | cmd.chanlist_len, s->len_chanlist); |
2578ae7c | 1409 | return -EINVAL; |
ed9eccbe DS |
1410 | } |
1411 | ||
1412 | /* make sure channel/gain list isn't too short */ | |
88bc0574 | 1413 | if (cmd.chanlist_len < 1) { |
ed9eccbe | 1414 | DPRINTK("channel/gain list too short %u < 1\n", |
88bc0574 | 1415 | cmd.chanlist_len); |
2578ae7c | 1416 | return -EINVAL; |
ed9eccbe DS |
1417 | } |
1418 | ||
88bc0574 | 1419 | async->cmd = cmd; |
ed9eccbe DS |
1420 | async->cmd.data = NULL; |
1421 | /* load channel/gain list */ | |
1422 | async->cmd.chanlist = | |
476b8477 | 1423 | kmalloc(async->cmd.chanlist_len * sizeof(int), GFP_KERNEL); |
ed9eccbe DS |
1424 | if (!async->cmd.chanlist) { |
1425 | DPRINTK("allocation failed\n"); | |
2578ae7c | 1426 | return -ENOMEM; |
ed9eccbe DS |
1427 | } |
1428 | ||
95bc359f | 1429 | if (copy_from_user(async->cmd.chanlist, user_chanlist, |
476b8477 | 1430 | async->cmd.chanlist_len * sizeof(int))) { |
ed9eccbe DS |
1431 | DPRINTK("fault reading chanlist\n"); |
1432 | ret = -EFAULT; | |
1433 | goto cleanup; | |
1434 | } | |
1435 | ||
1436 | /* make sure each element in channel/gain list is valid */ | |
21fe2eea M |
1437 | ret = comedi_check_chanlist(s, |
1438 | async->cmd.chanlist_len, | |
1439 | async->cmd.chanlist); | |
476b8477 | 1440 | if (ret < 0) { |
ed9eccbe DS |
1441 | DPRINTK("bad chanlist\n"); |
1442 | goto cleanup; | |
1443 | } | |
1444 | ||
1445 | ret = s->do_cmdtest(dev, s, &async->cmd); | |
1446 | ||
1447 | if (async->cmd.flags & TRIG_BOGUS || ret) { | |
1448 | DPRINTK("test returned %d\n", ret); | |
88bc0574 | 1449 | cmd = async->cmd; |
476b8477 | 1450 | /* restore chanlist pointer before copying back */ |
95bc359f | 1451 | cmd.chanlist = (unsigned int __force *)user_chanlist; |
88bc0574 | 1452 | cmd.data = NULL; |
bc252fd1 | 1453 | if (copy_to_user(arg, &cmd, sizeof(cmd))) { |
ed9eccbe DS |
1454 | DPRINTK("fault writing cmd\n"); |
1455 | ret = -EFAULT; | |
1456 | goto cleanup; | |
1457 | } | |
1458 | ret = -EAGAIN; | |
1459 | goto cleanup; | |
1460 | } | |
1461 | ||
1462 | if (!async->prealloc_bufsz) { | |
1463 | ret = -ENOMEM; | |
1464 | DPRINTK("no buffer (?)\n"); | |
1465 | goto cleanup; | |
1466 | } | |
1467 | ||
61c9fb0e | 1468 | comedi_buf_reset(async); |
ed9eccbe DS |
1469 | |
1470 | async->cb_mask = | |
476b8477 GKH |
1471 | COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR | |
1472 | COMEDI_CB_OVERFLOW; | |
1473 | if (async->cmd.flags & TRIG_WAKE_EOS) | |
ed9eccbe | 1474 | async->cb_mask |= COMEDI_CB_EOS; |
ed9eccbe DS |
1475 | |
1476 | comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING); | |
1477 | ||
2578ae7c IA |
1478 | /* set s->busy _after_ setting SRF_RUNNING flag to avoid race with |
1479 | * comedi_read() or comedi_write() */ | |
1480 | s->busy = file; | |
ed9eccbe DS |
1481 | ret = s->do_cmd(dev, s); |
1482 | if (ret == 0) | |
1483 | return 0; | |
1484 | ||
476b8477 | 1485 | cleanup: |
ed9eccbe DS |
1486 | do_become_nonbusy(dev, s); |
1487 | ||
1488 | return ret; | |
1489 | } | |
1490 | ||
1491 | /* | |
1492 | COMEDI_CMDTEST | |
1493 | command testing ioctl | |
1494 | ||
1495 | arg: | |
1496 | pointer to cmd structure | |
1497 | ||
1498 | reads: | |
1499 | cmd structure at arg | |
1500 | channel/range list | |
1501 | ||
1502 | writes: | |
1503 | modified cmd structure at arg | |
1504 | ||
1505 | */ | |
92d0127c GKH |
1506 | static int do_cmdtest_ioctl(struct comedi_device *dev, |
1507 | struct comedi_cmd __user *arg, void *file) | |
ed9eccbe | 1508 | { |
f8348677 | 1509 | struct comedi_cmd cmd; |
34c43922 | 1510 | struct comedi_subdevice *s; |
ed9eccbe DS |
1511 | int ret = 0; |
1512 | unsigned int *chanlist = NULL; | |
95bc359f | 1513 | unsigned int __user *user_chanlist; |
ed9eccbe | 1514 | |
bc252fd1 | 1515 | if (copy_from_user(&cmd, arg, sizeof(cmd))) { |
ed9eccbe DS |
1516 | DPRINTK("bad cmd address\n"); |
1517 | return -EFAULT; | |
1518 | } | |
476b8477 | 1519 | /* save user's chanlist pointer so it can be restored later */ |
95bc359f | 1520 | user_chanlist = (unsigned int __user *)cmd.chanlist; |
ed9eccbe | 1521 | |
f8348677 HS |
1522 | if (cmd.subdev >= dev->n_subdevices) { |
1523 | DPRINTK("%d no such subdevice\n", cmd.subdev); | |
ed9eccbe DS |
1524 | return -ENODEV; |
1525 | } | |
1526 | ||
f8348677 | 1527 | s = &dev->subdevices[cmd.subdev]; |
ed9eccbe | 1528 | if (s->type == COMEDI_SUBD_UNUSED) { |
f8348677 | 1529 | DPRINTK("%d not valid subdevice\n", cmd.subdev); |
ed9eccbe DS |
1530 | return -EIO; |
1531 | } | |
1532 | ||
1533 | if (!s->do_cmd || !s->do_cmdtest) { | |
1534 | DPRINTK("subdevice %i does not support commands\n", | |
f8348677 | 1535 | cmd.subdev); |
ed9eccbe DS |
1536 | return -EIO; |
1537 | } | |
1538 | ||
1539 | /* make sure channel/gain list isn't too long */ | |
f8348677 | 1540 | if (cmd.chanlist_len > s->len_chanlist) { |
ed9eccbe | 1541 | DPRINTK("channel/gain list too long %d > %d\n", |
f8348677 | 1542 | cmd.chanlist_len, s->len_chanlist); |
ed9eccbe DS |
1543 | ret = -EINVAL; |
1544 | goto cleanup; | |
1545 | } | |
1546 | ||
1547 | /* load channel/gain list */ | |
f8348677 | 1548 | if (cmd.chanlist) { |
ed9eccbe | 1549 | chanlist = |
f8348677 | 1550 | kmalloc(cmd.chanlist_len * sizeof(int), GFP_KERNEL); |
ed9eccbe DS |
1551 | if (!chanlist) { |
1552 | DPRINTK("allocation failed\n"); | |
1553 | ret = -ENOMEM; | |
1554 | goto cleanup; | |
1555 | } | |
1556 | ||
95bc359f | 1557 | if (copy_from_user(chanlist, user_chanlist, |
f8348677 | 1558 | cmd.chanlist_len * sizeof(int))) { |
ed9eccbe DS |
1559 | DPRINTK("fault reading chanlist\n"); |
1560 | ret = -EFAULT; | |
1561 | goto cleanup; | |
1562 | } | |
1563 | ||
1564 | /* make sure each element in channel/gain list is valid */ | |
f8348677 | 1565 | ret = comedi_check_chanlist(s, cmd.chanlist_len, chanlist); |
476b8477 | 1566 | if (ret < 0) { |
ed9eccbe DS |
1567 | DPRINTK("bad chanlist\n"); |
1568 | goto cleanup; | |
1569 | } | |
1570 | ||
f8348677 | 1571 | cmd.chanlist = chanlist; |
ed9eccbe DS |
1572 | } |
1573 | ||
f8348677 | 1574 | ret = s->do_cmdtest(dev, s, &cmd); |
ed9eccbe | 1575 | |
476b8477 | 1576 | /* restore chanlist pointer before copying back */ |
95bc359f | 1577 | cmd.chanlist = (unsigned int __force *)user_chanlist; |
ed9eccbe | 1578 | |
bc252fd1 | 1579 | if (copy_to_user(arg, &cmd, sizeof(cmd))) { |
ed9eccbe DS |
1580 | DPRINTK("bad cmd address\n"); |
1581 | ret = -EFAULT; | |
1582 | goto cleanup; | |
1583 | } | |
476b8477 GKH |
1584 | cleanup: |
1585 | kfree(chanlist); | |
ed9eccbe DS |
1586 | |
1587 | return ret; | |
1588 | } | |
1589 | ||
1590 | /* | |
1591 | COMEDI_LOCK | |
1592 | lock subdevice | |
1593 | ||
1594 | arg: | |
1595 | subdevice number | |
1596 | ||
1597 | reads: | |
1598 | none | |
1599 | ||
1600 | writes: | |
1601 | none | |
1602 | ||
1603 | */ | |
1604 | ||
0a85b6f0 MT |
1605 | static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg, |
1606 | void *file) | |
ed9eccbe DS |
1607 | { |
1608 | int ret = 0; | |
1609 | unsigned long flags; | |
34c43922 | 1610 | struct comedi_subdevice *s; |
ed9eccbe DS |
1611 | |
1612 | if (arg >= dev->n_subdevices) | |
1613 | return -EINVAL; | |
b077f2cd | 1614 | s = &dev->subdevices[arg]; |
ed9eccbe | 1615 | |
5f74ea14 | 1616 | spin_lock_irqsave(&s->spin_lock, flags); |
476b8477 | 1617 | if (s->busy || s->lock) |
ed9eccbe | 1618 | ret = -EBUSY; |
476b8477 | 1619 | else |
ed9eccbe | 1620 | s->lock = file; |
5f74ea14 | 1621 | spin_unlock_irqrestore(&s->spin_lock, flags); |
ed9eccbe | 1622 | |
c5274ab0 | 1623 | #if 0 |
ed9eccbe DS |
1624 | if (ret < 0) |
1625 | return ret; | |
1626 | ||
ed9eccbe DS |
1627 | if (s->lock_f) |
1628 | ret = s->lock_f(dev, s); | |
1629 | #endif | |
1630 | ||
1631 | return ret; | |
1632 | } | |
1633 | ||
1634 | /* | |
1635 | COMEDI_UNLOCK | |
1636 | unlock subdevice | |
1637 | ||
1638 | arg: | |
1639 | subdevice number | |
1640 | ||
1641 | reads: | |
1642 | none | |
1643 | ||
1644 | writes: | |
1645 | none | |
1646 | ||
1647 | This function isn't protected by the semaphore, since | |
1648 | we already own the lock. | |
1649 | */ | |
0a85b6f0 MT |
1650 | static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg, |
1651 | void *file) | |
ed9eccbe | 1652 | { |
34c43922 | 1653 | struct comedi_subdevice *s; |
ed9eccbe DS |
1654 | |
1655 | if (arg >= dev->n_subdevices) | |
1656 | return -EINVAL; | |
b077f2cd | 1657 | s = &dev->subdevices[arg]; |
ed9eccbe DS |
1658 | |
1659 | if (s->busy) | |
1660 | return -EBUSY; | |
1661 | ||
1662 | if (s->lock && s->lock != file) | |
1663 | return -EACCES; | |
1664 | ||
1665 | if (s->lock == file) { | |
1666 | #if 0 | |
1667 | if (s->unlock) | |
1668 | s->unlock(dev, s); | |
1669 | #endif | |
1670 | ||
1671 | s->lock = NULL; | |
1672 | } | |
1673 | ||
1674 | return 0; | |
1675 | } | |
1676 | ||
1677 | /* | |
1678 | COMEDI_CANCEL | |
1679 | cancel acquisition ioctl | |
1680 | ||
1681 | arg: | |
1682 | subdevice number | |
1683 | ||
1684 | reads: | |
1685 | nothing | |
1686 | ||
1687 | writes: | |
1688 | nothing | |
1689 | ||
1690 | */ | |
0a85b6f0 MT |
1691 | static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg, |
1692 | void *file) | |
ed9eccbe | 1693 | { |
34c43922 | 1694 | struct comedi_subdevice *s; |
867ea711 | 1695 | int ret; |
ed9eccbe DS |
1696 | |
1697 | if (arg >= dev->n_subdevices) | |
1698 | return -EINVAL; | |
b077f2cd | 1699 | s = &dev->subdevices[arg]; |
ed9eccbe DS |
1700 | if (s->async == NULL) |
1701 | return -EINVAL; | |
1702 | ||
1703 | if (s->lock && s->lock != file) | |
1704 | return -EACCES; | |
1705 | ||
1706 | if (!s->busy) | |
1707 | return 0; | |
1708 | ||
1709 | if (s->busy != file) | |
1710 | return -EBUSY; | |
1711 | ||
867ea711 IA |
1712 | ret = do_cancel(dev, s); |
1713 | if (comedi_get_subdevice_runflags(s) & SRF_USER) | |
1714 | wake_up_interruptible(&s->async->wait_head); | |
1715 | ||
1716 | return ret; | |
ed9eccbe DS |
1717 | } |
1718 | ||
1719 | /* | |
1720 | COMEDI_POLL ioctl | |
1721 | instructs driver to synchronize buffers | |
1722 | ||
1723 | arg: | |
1724 | subdevice number | |
1725 | ||
1726 | reads: | |
1727 | nothing | |
1728 | ||
1729 | writes: | |
1730 | nothing | |
1731 | ||
1732 | */ | |
0a85b6f0 MT |
1733 | static int do_poll_ioctl(struct comedi_device *dev, unsigned int arg, |
1734 | void *file) | |
ed9eccbe | 1735 | { |
34c43922 | 1736 | struct comedi_subdevice *s; |
ed9eccbe DS |
1737 | |
1738 | if (arg >= dev->n_subdevices) | |
1739 | return -EINVAL; | |
b077f2cd | 1740 | s = &dev->subdevices[arg]; |
ed9eccbe DS |
1741 | |
1742 | if (s->lock && s->lock != file) | |
1743 | return -EACCES; | |
1744 | ||
1745 | if (!s->busy) | |
1746 | return 0; | |
1747 | ||
1748 | if (s->busy != file) | |
1749 | return -EBUSY; | |
1750 | ||
1751 | if (s->poll) | |
1752 | return s->poll(dev, s); | |
1753 | ||
1754 | return -EINVAL; | |
1755 | } | |
1756 | ||
47db6d58 HS |
1757 | static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd, |
1758 | unsigned long arg) | |
1759 | { | |
6131ffaa | 1760 | const unsigned minor = iminor(file_inode(file)); |
5e04c254 | 1761 | struct comedi_device *dev = comedi_dev_from_minor(minor); |
47db6d58 HS |
1762 | int rc; |
1763 | ||
4da5fa9a | 1764 | if (!dev) |
47db6d58 | 1765 | return -ENODEV; |
47db6d58 HS |
1766 | |
1767 | mutex_lock(&dev->mutex); | |
1768 | ||
1769 | /* Device config is special, because it must work on | |
1770 | * an unconfigured device. */ | |
1771 | if (cmd == COMEDI_DEVCONFIG) { | |
754ab5c0 IA |
1772 | if (minor >= COMEDI_NUM_BOARD_MINORS) { |
1773 | /* Device config not appropriate on non-board minors. */ | |
1774 | rc = -ENOTTY; | |
1775 | goto done; | |
1776 | } | |
47db6d58 HS |
1777 | rc = do_devconfig_ioctl(dev, |
1778 | (struct comedi_devconfig __user *)arg); | |
8ab4ed6e IA |
1779 | if (rc == 0) { |
1780 | if (arg == 0 && | |
1781 | dev->minor >= comedi_num_legacy_minors) { | |
1782 | /* Successfully unconfigured a dynamically | |
1783 | * allocated device. Try and remove it. */ | |
db210da2 | 1784 | if (comedi_clear_board_dev(dev)) { |
8ab4ed6e | 1785 | mutex_unlock(&dev->mutex); |
cb6b79de | 1786 | comedi_free_board_dev(dev); |
8ab4ed6e IA |
1787 | return rc; |
1788 | } | |
1789 | } | |
1790 | } | |
47db6d58 HS |
1791 | goto done; |
1792 | } | |
1793 | ||
1794 | if (!dev->attached) { | |
1795 | DPRINTK("no driver configured on /dev/comedi%i\n", dev->minor); | |
1796 | rc = -ENODEV; | |
1797 | goto done; | |
1798 | } | |
1799 | ||
1800 | switch (cmd) { | |
1801 | case COMEDI_BUFCONFIG: | |
1802 | rc = do_bufconfig_ioctl(dev, | |
1803 | (struct comedi_bufconfig __user *)arg); | |
1804 | break; | |
1805 | case COMEDI_DEVINFO: | |
1806 | rc = do_devinfo_ioctl(dev, (struct comedi_devinfo __user *)arg, | |
1807 | file); | |
1808 | break; | |
1809 | case COMEDI_SUBDINFO: | |
1810 | rc = do_subdinfo_ioctl(dev, | |
1811 | (struct comedi_subdinfo __user *)arg, | |
1812 | file); | |
1813 | break; | |
1814 | case COMEDI_CHANINFO: | |
1815 | rc = do_chaninfo_ioctl(dev, (void __user *)arg); | |
1816 | break; | |
1817 | case COMEDI_RANGEINFO: | |
1818 | rc = do_rangeinfo_ioctl(dev, (void __user *)arg); | |
1819 | break; | |
1820 | case COMEDI_BUFINFO: | |
1821 | rc = do_bufinfo_ioctl(dev, | |
1822 | (struct comedi_bufinfo __user *)arg, | |
1823 | file); | |
1824 | break; | |
1825 | case COMEDI_LOCK: | |
1826 | rc = do_lock_ioctl(dev, arg, file); | |
1827 | break; | |
1828 | case COMEDI_UNLOCK: | |
1829 | rc = do_unlock_ioctl(dev, arg, file); | |
1830 | break; | |
1831 | case COMEDI_CANCEL: | |
1832 | rc = do_cancel_ioctl(dev, arg, file); | |
1833 | break; | |
1834 | case COMEDI_CMD: | |
1835 | rc = do_cmd_ioctl(dev, (struct comedi_cmd __user *)arg, file); | |
1836 | break; | |
1837 | case COMEDI_CMDTEST: | |
1838 | rc = do_cmdtest_ioctl(dev, (struct comedi_cmd __user *)arg, | |
1839 | file); | |
1840 | break; | |
1841 | case COMEDI_INSNLIST: | |
1842 | rc = do_insnlist_ioctl(dev, | |
1843 | (struct comedi_insnlist __user *)arg, | |
1844 | file); | |
1845 | break; | |
1846 | case COMEDI_INSN: | |
1847 | rc = do_insn_ioctl(dev, (struct comedi_insn __user *)arg, | |
1848 | file); | |
1849 | break; | |
1850 | case COMEDI_POLL: | |
1851 | rc = do_poll_ioctl(dev, arg, file); | |
1852 | break; | |
1853 | default: | |
1854 | rc = -ENOTTY; | |
1855 | break; | |
1856 | } | |
1857 | ||
1858 | done: | |
1859 | mutex_unlock(&dev->mutex); | |
1860 | return rc; | |
1861 | } | |
1862 | ||
df30b21c FV |
1863 | static void comedi_vm_open(struct vm_area_struct *area) |
1864 | { | |
1865 | struct comedi_async *async; | |
1866 | struct comedi_device *dev; | |
1867 | ||
1868 | async = area->vm_private_data; | |
1869 | dev = async->subdevice->device; | |
1870 | ||
1871 | mutex_lock(&dev->mutex); | |
1872 | async->mmap_count++; | |
1873 | mutex_unlock(&dev->mutex); | |
1874 | } | |
1875 | ||
1876 | static void comedi_vm_close(struct vm_area_struct *area) | |
ed9eccbe | 1877 | { |
d163679c | 1878 | struct comedi_async *async; |
71b5f4f1 | 1879 | struct comedi_device *dev; |
ed9eccbe DS |
1880 | |
1881 | async = area->vm_private_data; | |
1882 | dev = async->subdevice->device; | |
1883 | ||
1884 | mutex_lock(&dev->mutex); | |
1885 | async->mmap_count--; | |
1886 | mutex_unlock(&dev->mutex); | |
1887 | } | |
1888 | ||
1889 | static struct vm_operations_struct comedi_vm_ops = { | |
df30b21c FV |
1890 | .open = comedi_vm_open, |
1891 | .close = comedi_vm_close, | |
ed9eccbe DS |
1892 | }; |
1893 | ||
1894 | static int comedi_mmap(struct file *file, struct vm_area_struct *vma) | |
1895 | { | |
6131ffaa | 1896 | const unsigned minor = iminor(file_inode(file)); |
5e04c254 | 1897 | struct comedi_device *dev = comedi_dev_from_minor(minor); |
a52840a9 HS |
1898 | struct comedi_subdevice *s; |
1899 | struct comedi_async *async; | |
ed9eccbe DS |
1900 | unsigned long start = vma->vm_start; |
1901 | unsigned long size; | |
1902 | int n_pages; | |
1903 | int i; | |
1904 | int retval; | |
3ffab428 | 1905 | |
a52840a9 | 1906 | if (!dev) |
70fe742c | 1907 | return -ENODEV; |
ed9eccbe DS |
1908 | |
1909 | mutex_lock(&dev->mutex); | |
a52840a9 | 1910 | |
ed9eccbe DS |
1911 | if (!dev->attached) { |
1912 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
1913 | retval = -ENODEV; | |
1914 | goto done; | |
1915 | } | |
a52840a9 | 1916 | |
476b8477 | 1917 | if (vma->vm_flags & VM_WRITE) |
da56fdc6 | 1918 | s = comedi_write_subdevice(dev, minor); |
476b8477 | 1919 | else |
da56fdc6 | 1920 | s = comedi_read_subdevice(dev, minor); |
a52840a9 | 1921 | if (!s) { |
ed9eccbe DS |
1922 | retval = -EINVAL; |
1923 | goto done; | |
1924 | } | |
a52840a9 | 1925 | |
ed9eccbe | 1926 | async = s->async; |
a52840a9 | 1927 | if (!async) { |
ed9eccbe DS |
1928 | retval = -EINVAL; |
1929 | goto done; | |
1930 | } | |
1931 | ||
1932 | if (vma->vm_pgoff != 0) { | |
1933 | DPRINTK("comedi: mmap() offset must be 0.\n"); | |
1934 | retval = -EINVAL; | |
1935 | goto done; | |
1936 | } | |
1937 | ||
1938 | size = vma->vm_end - vma->vm_start; | |
1939 | if (size > async->prealloc_bufsz) { | |
1940 | retval = -EFAULT; | |
1941 | goto done; | |
1942 | } | |
1943 | if (size & (~PAGE_MASK)) { | |
1944 | retval = -EFAULT; | |
1945 | goto done; | |
1946 | } | |
1947 | ||
1948 | n_pages = size >> PAGE_SHIFT; | |
1949 | for (i = 0; i < n_pages; ++i) { | |
a52840a9 HS |
1950 | struct comedi_buf_page *buf = &async->buf_page_list[i]; |
1951 | ||
ed9eccbe | 1952 | if (remap_pfn_range(vma, start, |
a52840a9 HS |
1953 | page_to_pfn(virt_to_page(buf->virt_addr)), |
1954 | PAGE_SIZE, PAGE_SHARED)) { | |
ed9eccbe DS |
1955 | retval = -EAGAIN; |
1956 | goto done; | |
1957 | } | |
1958 | start += PAGE_SIZE; | |
1959 | } | |
1960 | ||
1961 | vma->vm_ops = &comedi_vm_ops; | |
1962 | vma->vm_private_data = async; | |
1963 | ||
1964 | async->mmap_count++; | |
1965 | ||
1966 | retval = 0; | |
476b8477 | 1967 | done: |
ed9eccbe DS |
1968 | mutex_unlock(&dev->mutex); |
1969 | return retval; | |
1970 | } | |
1971 | ||
1ae5062a | 1972 | static unsigned int comedi_poll(struct file *file, poll_table *wait) |
ed9eccbe DS |
1973 | { |
1974 | unsigned int mask = 0; | |
6131ffaa | 1975 | const unsigned minor = iminor(file_inode(file)); |
5e04c254 | 1976 | struct comedi_device *dev = comedi_dev_from_minor(minor); |
ca081b1d | 1977 | struct comedi_subdevice *s; |
3ffab428 | 1978 | |
ca081b1d | 1979 | if (!dev) |
70fe742c | 1980 | return -ENODEV; |
ed9eccbe DS |
1981 | |
1982 | mutex_lock(&dev->mutex); | |
ca081b1d | 1983 | |
ed9eccbe DS |
1984 | if (!dev->attached) { |
1985 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
ca081b1d | 1986 | goto done; |
ed9eccbe DS |
1987 | } |
1988 | ||
da56fdc6 | 1989 | s = comedi_read_subdevice(dev, minor); |
cc400e18 | 1990 | if (s && s->async) { |
ca081b1d | 1991 | poll_wait(file, &s->async->wait_head, wait); |
f0124630 | 1992 | if (!s->busy || !comedi_is_subdevice_running(s) || |
ca081b1d | 1993 | comedi_buf_read_n_available(s->async) > 0) |
ed9eccbe | 1994 | mask |= POLLIN | POLLRDNORM; |
ed9eccbe | 1995 | } |
ca081b1d | 1996 | |
da56fdc6 | 1997 | s = comedi_write_subdevice(dev, minor); |
cc400e18 | 1998 | if (s && s->async) { |
ca081b1d HS |
1999 | unsigned int bps = bytes_per_sample(s->async->subdevice); |
2000 | ||
2001 | poll_wait(file, &s->async->wait_head, wait); | |
2002 | comedi_buf_write_alloc(s->async, s->async->prealloc_bufsz); | |
f0124630 | 2003 | if (!s->busy || !comedi_is_subdevice_running(s) || |
ca081b1d | 2004 | comedi_buf_write_n_allocated(s->async) >= bps) |
ed9eccbe | 2005 | mask |= POLLOUT | POLLWRNORM; |
ed9eccbe DS |
2006 | } |
2007 | ||
ca081b1d | 2008 | done: |
ed9eccbe DS |
2009 | mutex_unlock(&dev->mutex); |
2010 | return mask; | |
2011 | } | |
2012 | ||
92d0127c GKH |
2013 | static ssize_t comedi_write(struct file *file, const char __user *buf, |
2014 | size_t nbytes, loff_t *offset) | |
ed9eccbe | 2015 | { |
34c43922 | 2016 | struct comedi_subdevice *s; |
d163679c | 2017 | struct comedi_async *async; |
ed9eccbe DS |
2018 | int n, m, count = 0, retval = 0; |
2019 | DECLARE_WAITQUEUE(wait, current); | |
6131ffaa | 2020 | const unsigned minor = iminor(file_inode(file)); |
5e04c254 | 2021 | struct comedi_device *dev = comedi_dev_from_minor(minor); |
3ffab428 | 2022 | |
2714b019 | 2023 | if (!dev) |
70fe742c | 2024 | return -ENODEV; |
ed9eccbe DS |
2025 | |
2026 | if (!dev->attached) { | |
2027 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
2714b019 | 2028 | return -ENODEV; |
ed9eccbe DS |
2029 | } |
2030 | ||
da56fdc6 | 2031 | s = comedi_write_subdevice(dev, minor); |
cc400e18 | 2032 | if (!s || !s->async) |
2714b019 HS |
2033 | return -EIO; |
2034 | ||
ed9eccbe DS |
2035 | async = s->async; |
2036 | ||
2714b019 HS |
2037 | if (!s->busy || !nbytes) |
2038 | return 0; | |
2039 | if (s->busy != file) | |
2040 | return -EACCES; | |
2041 | ||
ed9eccbe DS |
2042 | add_wait_queue(&async->wait_head, &wait); |
2043 | while (nbytes > 0 && !retval) { | |
2044 | set_current_state(TASK_INTERRUPTIBLE); | |
2045 | ||
f0124630 | 2046 | if (!comedi_is_subdevice_running(s)) { |
d2611540 | 2047 | if (count == 0) { |
2578ae7c | 2048 | mutex_lock(&dev->mutex); |
c098c21a | 2049 | if (comedi_is_subdevice_in_error(s)) |
d2611540 | 2050 | retval = -EPIPE; |
c098c21a | 2051 | else |
d2611540 | 2052 | retval = 0; |
d2611540 | 2053 | do_become_nonbusy(dev, s); |
2578ae7c | 2054 | mutex_unlock(&dev->mutex); |
d2611540 IA |
2055 | } |
2056 | break; | |
2057 | } | |
2058 | ||
ed9eccbe DS |
2059 | n = nbytes; |
2060 | ||
2061 | m = n; | |
476b8477 | 2062 | if (async->buf_write_ptr + m > async->prealloc_bufsz) |
ed9eccbe | 2063 | m = async->prealloc_bufsz - async->buf_write_ptr; |
ed9eccbe | 2064 | comedi_buf_write_alloc(async, async->prealloc_bufsz); |
476b8477 | 2065 | if (m > comedi_buf_write_n_allocated(async)) |
ed9eccbe | 2066 | m = comedi_buf_write_n_allocated(async); |
ed9eccbe DS |
2067 | if (m < n) |
2068 | n = m; | |
2069 | ||
2070 | if (n == 0) { | |
ed9eccbe DS |
2071 | if (file->f_flags & O_NONBLOCK) { |
2072 | retval = -EAGAIN; | |
2073 | break; | |
2074 | } | |
6a9ce6b6 | 2075 | schedule(); |
ed9eccbe DS |
2076 | if (signal_pending(current)) { |
2077 | retval = -ERESTARTSYS; | |
2078 | break; | |
2079 | } | |
476b8477 | 2080 | if (!s->busy) |
ed9eccbe | 2081 | break; |
ed9eccbe DS |
2082 | if (s->busy != file) { |
2083 | retval = -EACCES; | |
2084 | break; | |
2085 | } | |
2086 | continue; | |
2087 | } | |
2088 | ||
2089 | m = copy_from_user(async->prealloc_buf + async->buf_write_ptr, | |
476b8477 | 2090 | buf, n); |
ed9eccbe DS |
2091 | if (m) { |
2092 | n -= m; | |
2093 | retval = -EFAULT; | |
2094 | } | |
2095 | comedi_buf_write_free(async, n); | |
2096 | ||
2097 | count += n; | |
2098 | nbytes -= n; | |
2099 | ||
2100 | buf += n; | |
2101 | break; /* makes device work like a pipe */ | |
2102 | } | |
2103 | set_current_state(TASK_RUNNING); | |
2104 | remove_wait_queue(&async->wait_head, &wait); | |
2105 | ||
476b8477 | 2106 | return count ? count : retval; |
ed9eccbe DS |
2107 | } |
2108 | ||
92d0127c | 2109 | static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes, |
6705b68d | 2110 | loff_t *offset) |
ed9eccbe | 2111 | { |
34c43922 | 2112 | struct comedi_subdevice *s; |
d163679c | 2113 | struct comedi_async *async; |
ed9eccbe DS |
2114 | int n, m, count = 0, retval = 0; |
2115 | DECLARE_WAITQUEUE(wait, current); | |
6131ffaa | 2116 | const unsigned minor = iminor(file_inode(file)); |
5e04c254 | 2117 | struct comedi_device *dev = comedi_dev_from_minor(minor); |
3ffab428 | 2118 | |
5c87fef5 | 2119 | if (!dev) |
70fe742c | 2120 | return -ENODEV; |
ed9eccbe DS |
2121 | |
2122 | if (!dev->attached) { | |
2123 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
5c87fef5 | 2124 | return -ENODEV; |
ed9eccbe DS |
2125 | } |
2126 | ||
da56fdc6 | 2127 | s = comedi_read_subdevice(dev, minor); |
cc400e18 | 2128 | if (!s || !s->async) |
5c87fef5 HS |
2129 | return -EIO; |
2130 | ||
ed9eccbe | 2131 | async = s->async; |
5c87fef5 HS |
2132 | if (!s->busy || !nbytes) |
2133 | return 0; | |
2134 | if (s->busy != file) | |
2135 | return -EACCES; | |
ed9eccbe DS |
2136 | |
2137 | add_wait_queue(&async->wait_head, &wait); | |
2138 | while (nbytes > 0 && !retval) { | |
2139 | set_current_state(TASK_INTERRUPTIBLE); | |
2140 | ||
2141 | n = nbytes; | |
2142 | ||
2143 | m = comedi_buf_read_n_available(async); | |
476b8477 GKH |
2144 | /* printk("%d available\n",m); */ |
2145 | if (async->buf_read_ptr + m > async->prealloc_bufsz) | |
ed9eccbe | 2146 | m = async->prealloc_bufsz - async->buf_read_ptr; |
476b8477 | 2147 | /* printk("%d contiguous\n",m); */ |
ed9eccbe DS |
2148 | if (m < n) |
2149 | n = m; | |
2150 | ||
2151 | if (n == 0) { | |
f0124630 | 2152 | if (!comedi_is_subdevice_running(s)) { |
2578ae7c | 2153 | mutex_lock(&dev->mutex); |
ed9eccbe | 2154 | do_become_nonbusy(dev, s); |
c098c21a | 2155 | if (comedi_is_subdevice_in_error(s)) |
ed9eccbe | 2156 | retval = -EPIPE; |
c098c21a | 2157 | else |
ed9eccbe | 2158 | retval = 0; |
2578ae7c | 2159 | mutex_unlock(&dev->mutex); |
ed9eccbe DS |
2160 | break; |
2161 | } | |
2162 | if (file->f_flags & O_NONBLOCK) { | |
2163 | retval = -EAGAIN; | |
2164 | break; | |
2165 | } | |
6a9ce6b6 | 2166 | schedule(); |
ed9eccbe DS |
2167 | if (signal_pending(current)) { |
2168 | retval = -ERESTARTSYS; | |
2169 | break; | |
2170 | } | |
ed9eccbe DS |
2171 | if (!s->busy) { |
2172 | retval = 0; | |
2173 | break; | |
2174 | } | |
2175 | if (s->busy != file) { | |
2176 | retval = -EACCES; | |
2177 | break; | |
2178 | } | |
2179 | continue; | |
2180 | } | |
2181 | m = copy_to_user(buf, async->prealloc_buf + | |
476b8477 | 2182 | async->buf_read_ptr, n); |
ed9eccbe DS |
2183 | if (m) { |
2184 | n -= m; | |
2185 | retval = -EFAULT; | |
2186 | } | |
2187 | ||
2188 | comedi_buf_read_alloc(async, n); | |
2189 | comedi_buf_read_free(async, n); | |
2190 | ||
2191 | count += n; | |
2192 | nbytes -= n; | |
2193 | ||
2194 | buf += n; | |
2195 | break; /* makes device work like a pipe */ | |
2196 | } | |
2578ae7c IA |
2197 | if (comedi_is_subdevice_idle(s)) { |
2198 | mutex_lock(&dev->mutex); | |
2199 | if (async->buf_read_count - async->buf_write_count == 0) | |
2200 | do_become_nonbusy(dev, s); | |
2201 | mutex_unlock(&dev->mutex); | |
ed9eccbe DS |
2202 | } |
2203 | set_current_state(TASK_RUNNING); | |
2204 | remove_wait_queue(&async->wait_head, &wait); | |
2205 | ||
476b8477 | 2206 | return count ? count : retval; |
ed9eccbe DS |
2207 | } |
2208 | ||
ed9eccbe DS |
2209 | static int comedi_open(struct inode *inode, struct file *file) |
2210 | { | |
ed9eccbe | 2211 | const unsigned minor = iminor(inode); |
4da5fa9a | 2212 | struct comedi_device *dev = comedi_dev_from_minor(minor); |
97920071 | 2213 | |
4da5fa9a | 2214 | if (!dev) { |
ed9eccbe DS |
2215 | DPRINTK("invalid minor number\n"); |
2216 | return -ENODEV; | |
2217 | } | |
2218 | ||
2219 | /* This is slightly hacky, but we want module autoloading | |
2220 | * to work for root. | |
2221 | * case: user opens device, attached -> ok | |
13f12b5a IA |
2222 | * case: user opens device, unattached, !in_request_module -> autoload |
2223 | * case: user opens device, unattached, in_request_module -> fail | |
ed9eccbe | 2224 | * case: root opens device, attached -> ok |
13f12b5a | 2225 | * case: root opens device, unattached, in_request_module -> ok |
ed9eccbe | 2226 | * (typically called from modprobe) |
13f12b5a | 2227 | * case: root opens device, unattached, !in_request_module -> autoload |
ed9eccbe DS |
2228 | * |
2229 | * The last could be changed to "-> ok", which would deny root | |
2230 | * autoloading. | |
2231 | */ | |
2232 | mutex_lock(&dev->mutex); | |
2233 | if (dev->attached) | |
2234 | goto ok; | |
a8f80e8f | 2235 | if (!capable(CAP_NET_ADMIN) && dev->in_request_module) { |
ed9eccbe DS |
2236 | DPRINTK("in request module\n"); |
2237 | mutex_unlock(&dev->mutex); | |
2238 | return -ENODEV; | |
2239 | } | |
a8f80e8f | 2240 | if (capable(CAP_NET_ADMIN) && dev->in_request_module) |
ed9eccbe DS |
2241 | goto ok; |
2242 | ||
13f12b5a | 2243 | dev->in_request_module = true; |
ed9eccbe | 2244 | |
ed9eccbe DS |
2245 | #ifdef CONFIG_KMOD |
2246 | mutex_unlock(&dev->mutex); | |
56d92c60 | 2247 | request_module("char-major-%i-%i", COMEDI_MAJOR, dev->minor); |
ed9eccbe DS |
2248 | mutex_lock(&dev->mutex); |
2249 | #endif | |
2250 | ||
13f12b5a | 2251 | dev->in_request_module = false; |
ed9eccbe | 2252 | |
a8f80e8f EP |
2253 | if (!dev->attached && !capable(CAP_NET_ADMIN)) { |
2254 | DPRINTK("not attached and not CAP_NET_ADMIN\n"); | |
ed9eccbe DS |
2255 | mutex_unlock(&dev->mutex); |
2256 | return -ENODEV; | |
2257 | } | |
2258 | ok: | |
2259 | __module_get(THIS_MODULE); | |
2260 | ||
2261 | if (dev->attached) { | |
2262 | if (!try_module_get(dev->driver->module)) { | |
2263 | module_put(THIS_MODULE); | |
2264 | mutex_unlock(&dev->mutex); | |
2265 | return -ENOSYS; | |
2266 | } | |
2267 | } | |
2268 | ||
3c17ba07 IA |
2269 | if (dev->attached && dev->use_count == 0 && dev->open) { |
2270 | int rc = dev->open(dev); | |
2271 | if (rc < 0) { | |
2272 | module_put(dev->driver->module); | |
2273 | module_put(THIS_MODULE); | |
2274 | mutex_unlock(&dev->mutex); | |
2275 | return rc; | |
2276 | } | |
2277 | } | |
ed9eccbe DS |
2278 | |
2279 | dev->use_count++; | |
2280 | ||
a5011a26 | 2281 | mutex_unlock(&dev->mutex); |
ed9eccbe | 2282 | |
a5011a26 | 2283 | return 0; |
ed9eccbe DS |
2284 | } |
2285 | ||
2aae0076 HS |
2286 | static int comedi_fasync(int fd, struct file *file, int on) |
2287 | { | |
6131ffaa | 2288 | const unsigned minor = iminor(file_inode(file)); |
4da5fa9a | 2289 | struct comedi_device *dev = comedi_dev_from_minor(minor); |
2aae0076 | 2290 | |
4da5fa9a | 2291 | if (!dev) |
2aae0076 HS |
2292 | return -ENODEV; |
2293 | ||
2294 | return fasync_helper(fd, file, on, &dev->async_queue); | |
2295 | } | |
2296 | ||
a5011a26 | 2297 | static int comedi_close(struct inode *inode, struct file *file) |
ed9eccbe | 2298 | { |
a5011a26 | 2299 | const unsigned minor = iminor(inode); |
4da5fa9a | 2300 | struct comedi_device *dev = comedi_dev_from_minor(minor); |
a5011a26 | 2301 | struct comedi_subdevice *s = NULL; |
ed9eccbe DS |
2302 | int i; |
2303 | ||
4da5fa9a | 2304 | if (!dev) |
a5011a26 | 2305 | return -ENODEV; |
ed9eccbe | 2306 | |
a5011a26 HS |
2307 | mutex_lock(&dev->mutex); |
2308 | ||
2309 | if (dev->subdevices) { | |
2310 | for (i = 0; i < dev->n_subdevices; i++) { | |
b077f2cd | 2311 | s = &dev->subdevices[i]; |
a5011a26 HS |
2312 | |
2313 | if (s->busy == file) | |
2314 | do_cancel(dev, s); | |
2315 | if (s->lock == file) | |
2316 | s->lock = NULL; | |
2317 | } | |
ed9eccbe | 2318 | } |
a5011a26 HS |
2319 | if (dev->attached && dev->use_count == 1 && dev->close) |
2320 | dev->close(dev); | |
2321 | ||
2322 | module_put(THIS_MODULE); | |
2323 | if (dev->attached) | |
2324 | module_put(dev->driver->module); | |
2325 | ||
2326 | dev->use_count--; | |
2327 | ||
2328 | mutex_unlock(&dev->mutex); | |
2329 | ||
2330 | if (file->f_flags & FASYNC) | |
2331 | comedi_fasync(-1, file, 0); | |
ed9eccbe DS |
2332 | |
2333 | return 0; | |
2334 | } | |
2335 | ||
8cb8aad7 | 2336 | static const struct file_operations comedi_fops = { |
a5011a26 HS |
2337 | .owner = THIS_MODULE, |
2338 | .unlocked_ioctl = comedi_unlocked_ioctl, | |
2339 | .compat_ioctl = comedi_compat_ioctl, | |
2340 | .open = comedi_open, | |
2341 | .release = comedi_close, | |
2342 | .read = comedi_read, | |
2343 | .write = comedi_write, | |
2344 | .mmap = comedi_mmap, | |
2345 | .poll = comedi_poll, | |
2346 | .fasync = comedi_fasync, | |
2347 | .llseek = noop_llseek, | |
2348 | }; | |
2349 | ||
a5011a26 HS |
2350 | void comedi_error(const struct comedi_device *dev, const char *s) |
2351 | { | |
4f870fe6 | 2352 | dev_err(dev->class_dev, "%s: %s\n", dev->driver->driver_name, s); |
ed9eccbe | 2353 | } |
5660e742 | 2354 | EXPORT_SYMBOL_GPL(comedi_error); |
883db3d9 | 2355 | |
a5011a26 | 2356 | void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s) |
883db3d9 | 2357 | { |
a5011a26 HS |
2358 | struct comedi_async *async = s->async; |
2359 | unsigned runflags = 0; | |
2360 | unsigned runflags_mask = 0; | |
883db3d9 | 2361 | |
a5011a26 | 2362 | /* DPRINTK("comedi_event 0x%x\n",mask); */ |
883db3d9 | 2363 | |
f0124630 | 2364 | if (!comedi_is_subdevice_running(s)) |
a5011a26 HS |
2365 | return; |
2366 | ||
2367 | if (s-> | |
2368 | async->events & (COMEDI_CB_EOA | COMEDI_CB_ERROR | | |
2369 | COMEDI_CB_OVERFLOW)) { | |
2370 | runflags_mask |= SRF_RUNNING; | |
883db3d9 | 2371 | } |
a5011a26 HS |
2372 | /* remember if an error event has occurred, so an error |
2373 | * can be returned the next time the user does a read() */ | |
2374 | if (s->async->events & (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) { | |
2375 | runflags_mask |= SRF_ERROR; | |
2376 | runflags |= SRF_ERROR; | |
883db3d9 | 2377 | } |
a5011a26 HS |
2378 | if (runflags_mask) { |
2379 | /*sets SRF_ERROR and SRF_RUNNING together atomically */ | |
2380 | comedi_set_subdevice_runflags(s, runflags_mask, runflags); | |
883db3d9 FMH |
2381 | } |
2382 | ||
a5011a26 HS |
2383 | if (async->cb_mask & s->async->events) { |
2384 | if (comedi_get_subdevice_runflags(s) & SRF_USER) { | |
2385 | wake_up_interruptible(&async->wait_head); | |
2386 | if (s->subdev_flags & SDF_CMD_READ) | |
2387 | kill_fasync(&dev->async_queue, SIGIO, POLL_IN); | |
2388 | if (s->subdev_flags & SDF_CMD_WRITE) | |
2389 | kill_fasync(&dev->async_queue, SIGIO, POLL_OUT); | |
2390 | } else { | |
2391 | if (async->cb_func) | |
2392 | async->cb_func(s->async->events, async->cb_arg); | |
2393 | } | |
2394 | } | |
2395 | s->async->events = 0; | |
883db3d9 | 2396 | } |
5660e742 | 2397 | EXPORT_SYMBOL_GPL(comedi_event); |
883db3d9 | 2398 | |
07778393 | 2399 | /* Note: the ->mutex is pre-locked on successful return */ |
7638ffcb | 2400 | struct comedi_device *comedi_alloc_board_minor(struct device *hardware_device) |
a5011a26 | 2401 | { |
7638ffcb | 2402 | struct comedi_device *dev; |
a5011a26 HS |
2403 | struct device *csdev; |
2404 | unsigned i; | |
a5011a26 | 2405 | |
7638ffcb | 2406 | dev = kzalloc(sizeof(struct comedi_device), GFP_KERNEL); |
cb6b79de | 2407 | if (dev == NULL) |
7638ffcb | 2408 | return ERR_PTR(-ENOMEM); |
7638ffcb | 2409 | comedi_device_init(dev); |
db2e3487 | 2410 | comedi_set_hw_dev(dev, hardware_device); |
07778393 | 2411 | mutex_lock(&dev->mutex); |
5b7dba1b | 2412 | mutex_lock(&comedi_board_minor_table_lock); |
38b9722a IA |
2413 | for (i = hardware_device ? comedi_num_legacy_minors : 0; |
2414 | i < COMEDI_NUM_BOARD_MINORS; ++i) { | |
5b7dba1b | 2415 | if (comedi_board_minor_table[i] == NULL) { |
cb6b79de | 2416 | comedi_board_minor_table[i] = dev; |
a5011a26 HS |
2417 | break; |
2418 | } | |
2419 | } | |
5b7dba1b | 2420 | mutex_unlock(&comedi_board_minor_table_lock); |
a5011a26 | 2421 | if (i == COMEDI_NUM_BOARD_MINORS) { |
07778393 | 2422 | mutex_unlock(&dev->mutex); |
7638ffcb IA |
2423 | comedi_device_cleanup(dev); |
2424 | kfree(dev); | |
4f870fe6 | 2425 | pr_err("comedi: error: ran out of minor numbers for board device files.\n"); |
7638ffcb | 2426 | return ERR_PTR(-EBUSY); |
a5011a26 | 2427 | } |
7638ffcb | 2428 | dev->minor = i; |
a5011a26 HS |
2429 | csdev = device_create(comedi_class, hardware_device, |
2430 | MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i", i); | |
2431 | if (!IS_ERR(csdev)) | |
7638ffcb | 2432 | dev->class_dev = csdev; |
883db3d9 | 2433 | |
07778393 | 2434 | /* Note: dev->mutex needs to be unlocked by the caller. */ |
7638ffcb | 2435 | return dev; |
883db3d9 FMH |
2436 | } |
2437 | ||
70f30c37 | 2438 | static void comedi_free_board_minor(unsigned minor) |
24fb134d IA |
2439 | { |
2440 | BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS); | |
cb6b79de | 2441 | comedi_free_board_dev(comedi_clear_board_minor(minor)); |
24fb134d IA |
2442 | } |
2443 | ||
3346b798 | 2444 | void comedi_release_hardware_device(struct device *hardware_device) |
883db3d9 | 2445 | { |
a5011a26 | 2446 | int minor; |
cb6b79de | 2447 | struct comedi_device *dev; |
883db3d9 | 2448 | |
38b9722a IA |
2449 | for (minor = comedi_num_legacy_minors; minor < COMEDI_NUM_BOARD_MINORS; |
2450 | minor++) { | |
5b7dba1b | 2451 | mutex_lock(&comedi_board_minor_table_lock); |
cb6b79de IA |
2452 | dev = comedi_board_minor_table[minor]; |
2453 | if (dev && dev->hw_dev == hardware_device) { | |
5b7dba1b IA |
2454 | comedi_board_minor_table[minor] = NULL; |
2455 | mutex_unlock(&comedi_board_minor_table_lock); | |
cb6b79de | 2456 | comedi_free_board_dev(dev); |
3346b798 | 2457 | break; |
a5011a26 | 2458 | } |
5b7dba1b | 2459 | mutex_unlock(&comedi_board_minor_table_lock); |
883db3d9 | 2460 | } |
883db3d9 FMH |
2461 | } |
2462 | ||
f65cc544 | 2463 | int comedi_alloc_subdevice_minor(struct comedi_subdevice *s) |
883db3d9 | 2464 | { |
f65cc544 | 2465 | struct comedi_device *dev = s->device; |
a5011a26 HS |
2466 | struct device *csdev; |
2467 | unsigned i; | |
883db3d9 | 2468 | |
5b7dba1b IA |
2469 | mutex_lock(&comedi_subdevice_minor_table_lock); |
2470 | for (i = 0; i < COMEDI_NUM_SUBDEVICE_MINORS; ++i) { | |
2471 | if (comedi_subdevice_minor_table[i] == NULL) { | |
bd5b4173 | 2472 | comedi_subdevice_minor_table[i] = s; |
a5011a26 HS |
2473 | break; |
2474 | } | |
2475 | } | |
5b7dba1b IA |
2476 | mutex_unlock(&comedi_subdevice_minor_table_lock); |
2477 | if (i == COMEDI_NUM_SUBDEVICE_MINORS) { | |
b12da2e4 | 2478 | pr_err("comedi: error: ran out of minor numbers for subdevice files.\n"); |
a5011a26 HS |
2479 | return -EBUSY; |
2480 | } | |
5b7dba1b | 2481 | i += COMEDI_NUM_BOARD_MINORS; |
a5011a26 HS |
2482 | s->minor = i; |
2483 | csdev = device_create(comedi_class, dev->class_dev, | |
2484 | MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i_subd%i", | |
90a35c15 | 2485 | dev->minor, s->index); |
a5011a26 HS |
2486 | if (!IS_ERR(csdev)) |
2487 | s->class_dev = csdev; | |
883db3d9 | 2488 | |
da718546 | 2489 | return 0; |
883db3d9 FMH |
2490 | } |
2491 | ||
a5011a26 | 2492 | void comedi_free_subdevice_minor(struct comedi_subdevice *s) |
883db3d9 | 2493 | { |
0fcc9d48 | 2494 | unsigned int i; |
883db3d9 | 2495 | |
a5011a26 HS |
2496 | if (s == NULL) |
2497 | return; | |
2498 | if (s->minor < 0) | |
2499 | return; | |
883db3d9 | 2500 | |
a5011a26 | 2501 | BUG_ON(s->minor >= COMEDI_NUM_MINORS); |
8907cf6c | 2502 | BUG_ON(s->minor < COMEDI_NUM_BOARD_MINORS); |
883db3d9 | 2503 | |
0fcc9d48 IA |
2504 | i = s->minor - COMEDI_NUM_BOARD_MINORS; |
2505 | mutex_lock(&comedi_subdevice_minor_table_lock); | |
bd5b4173 IA |
2506 | if (s == comedi_subdevice_minor_table[i]) |
2507 | comedi_subdevice_minor_table[i] = NULL; | |
0fcc9d48 | 2508 | mutex_unlock(&comedi_subdevice_minor_table_lock); |
a5011a26 HS |
2509 | if (s->class_dev) { |
2510 | device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor)); | |
2511 | s->class_dev = NULL; | |
883db3d9 | 2512 | } |
883db3d9 | 2513 | } |
a5787824 | 2514 | |
682b9119 | 2515 | static void comedi_cleanup_board_minors(void) |
76cca89f HS |
2516 | { |
2517 | unsigned i; | |
2518 | ||
682b9119 | 2519 | for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) |
76cca89f HS |
2520 | comedi_free_board_minor(i); |
2521 | } | |
2522 | ||
91fa0b0c HS |
2523 | static int __init comedi_init(void) |
2524 | { | |
2525 | int i; | |
2526 | int retval; | |
2527 | ||
2528 | pr_info("comedi: version " COMEDI_RELEASE " - http://www.comedi.org\n"); | |
2529 | ||
2530 | if (comedi_num_legacy_minors < 0 || | |
2531 | comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) { | |
2532 | pr_err("comedi: error: invalid value for module parameter \"comedi_num_legacy_minors\". Valid values are 0 through %i.\n", | |
2533 | COMEDI_NUM_BOARD_MINORS); | |
2534 | return -EINVAL; | |
2535 | } | |
2536 | ||
91fa0b0c HS |
2537 | retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0), |
2538 | COMEDI_NUM_MINORS, "comedi"); | |
2539 | if (retval) | |
2540 | return -EIO; | |
2541 | cdev_init(&comedi_cdev, &comedi_fops); | |
2542 | comedi_cdev.owner = THIS_MODULE; | |
2543 | kobject_set_name(&comedi_cdev.kobj, "comedi"); | |
2544 | if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) { | |
2545 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
2546 | COMEDI_NUM_MINORS); | |
2547 | return -EIO; | |
2548 | } | |
2549 | comedi_class = class_create(THIS_MODULE, "comedi"); | |
2550 | if (IS_ERR(comedi_class)) { | |
2551 | pr_err("comedi: failed to create class\n"); | |
2552 | cdev_del(&comedi_cdev); | |
2553 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
2554 | COMEDI_NUM_MINORS); | |
2555 | return PTR_ERR(comedi_class); | |
2556 | } | |
2557 | ||
2558 | comedi_class->dev_attrs = comedi_dev_attrs; | |
2559 | ||
91fa0b0c HS |
2560 | /* create devices files for legacy/manual use */ |
2561 | for (i = 0; i < comedi_num_legacy_minors; i++) { | |
7638ffcb IA |
2562 | struct comedi_device *dev; |
2563 | dev = comedi_alloc_board_minor(NULL); | |
2564 | if (IS_ERR(dev)) { | |
682b9119 | 2565 | comedi_cleanup_board_minors(); |
fe7e5549 | 2566 | class_destroy(comedi_class); |
91fa0b0c HS |
2567 | cdev_del(&comedi_cdev); |
2568 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
2569 | COMEDI_NUM_MINORS); | |
7638ffcb | 2570 | return PTR_ERR(dev); |
07778393 IA |
2571 | } else { |
2572 | /* comedi_alloc_board_minor() locked the mutex */ | |
2573 | mutex_unlock(&dev->mutex); | |
91fa0b0c HS |
2574 | } |
2575 | } | |
2576 | ||
b673e043 CKC |
2577 | /* XXX requires /proc interface */ |
2578 | comedi_proc_init(); | |
2579 | ||
91fa0b0c HS |
2580 | return 0; |
2581 | } | |
2582 | module_init(comedi_init); | |
2583 | ||
2584 | static void __exit comedi_cleanup(void) | |
2585 | { | |
2586 | int i; | |
2587 | ||
682b9119 | 2588 | comedi_cleanup_board_minors(); |
5b7dba1b IA |
2589 | for (i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i) |
2590 | BUG_ON(comedi_board_minor_table[i]); | |
2591 | for (i = 0; i < COMEDI_NUM_SUBDEVICE_MINORS; ++i) | |
2592 | BUG_ON(comedi_subdevice_minor_table[i]); | |
91fa0b0c HS |
2593 | |
2594 | class_destroy(comedi_class); | |
2595 | cdev_del(&comedi_cdev); | |
2596 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS); | |
2597 | ||
2598 | comedi_proc_cleanup(); | |
2599 | } | |
2600 | module_exit(comedi_cleanup); | |
2601 | ||
a5787824 HS |
2602 | MODULE_AUTHOR("http://www.comedi.org"); |
2603 | MODULE_DESCRIPTION("Comedi core module"); | |
2604 | MODULE_LICENSE("GPL"); |