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Commit | Line | Data |
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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. | |
ed9eccbe DS |
17 | */ |
18 | ||
19 | #undef DEBUG | |
20 | ||
ed9eccbe DS |
21 | #include "comedi_compat32.h" |
22 | ||
23 | #include <linux/module.h> | |
24 | #include <linux/errno.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/sched.h> | |
27 | #include <linux/fcntl.h> | |
28 | #include <linux/delay.h> | |
29 | #include <linux/ioport.h> | |
30 | #include <linux/mm.h> | |
31 | #include <linux/slab.h> | |
32 | #include <linux/kmod.h> | |
33 | #include <linux/poll.h> | |
34 | #include <linux/init.h> | |
35 | #include <linux/device.h> | |
36 | #include <linux/vmalloc.h> | |
37 | #include <linux/fs.h> | |
38 | #include "comedidev.h" | |
39 | #include <linux/cdev.h> | |
883db3d9 | 40 | #include <linux/stat.h> |
ed9eccbe | 41 | |
476b8477 GKH |
42 | #include <linux/io.h> |
43 | #include <linux/uaccess.h> | |
ed9eccbe | 44 | |
3a5fa275 | 45 | #include "comedi_internal.h" |
ed9eccbe | 46 | |
eda56825 | 47 | #define COMEDI_NUM_MINORS 0x100 |
5b7dba1b IA |
48 | #define COMEDI_NUM_SUBDEVICE_MINORS \ |
49 | (COMEDI_NUM_MINORS - COMEDI_NUM_BOARD_MINORS) | |
eda56825 | 50 | |
ed9eccbe DS |
51 | #ifdef CONFIG_COMEDI_DEBUG |
52 | int comedi_debug; | |
5660e742 | 53 | EXPORT_SYMBOL_GPL(comedi_debug); |
4d7df821 IA |
54 | module_param(comedi_debug, int, S_IRUGO | S_IWUSR); |
55 | MODULE_PARM_DESC(comedi_debug, | |
56 | "enable comedi core and driver debugging if non-zero (default 0)" | |
57 | ); | |
ed9eccbe DS |
58 | #endif |
59 | ||
92d0127c | 60 | static int comedi_num_legacy_minors; |
4d7df821 IA |
61 | module_param(comedi_num_legacy_minors, int, S_IRUGO); |
62 | MODULE_PARM_DESC(comedi_num_legacy_minors, | |
63 | "number of comedi minor devices to reserve for non-auto-configured devices (default 0)" | |
64 | ); | |
65 | ||
234bb3c6 | 66 | unsigned int comedi_default_buf_size_kb = CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB; |
4d7df821 IA |
67 | module_param(comedi_default_buf_size_kb, uint, S_IRUGO | S_IWUSR); |
68 | MODULE_PARM_DESC(comedi_default_buf_size_kb, | |
69 | "default asynchronous buffer size in KiB (default " | |
234bb3c6 | 70 | __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB) ")"); |
4d7df821 | 71 | |
234bb3c6 IA |
72 | unsigned int comedi_default_buf_maxsize_kb |
73 | = CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB; | |
4d7df821 IA |
74 | module_param(comedi_default_buf_maxsize_kb, uint, S_IRUGO | S_IWUSR); |
75 | MODULE_PARM_DESC(comedi_default_buf_maxsize_kb, | |
76 | "default maximum size of asynchronous buffer in KiB (default " | |
234bb3c6 | 77 | __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB) ")"); |
1dd33ab8 | 78 | |
5b7dba1b | 79 | static DEFINE_MUTEX(comedi_board_minor_table_lock); |
cb6b79de | 80 | static struct comedi_device |
5b7dba1b IA |
81 | *comedi_board_minor_table[COMEDI_NUM_BOARD_MINORS]; |
82 | ||
83 | static DEFINE_MUTEX(comedi_subdevice_minor_table_lock); | |
84 | /* Note: indexed by minor - COMEDI_NUM_BOARD_MINORS. */ | |
bd5b4173 | 85 | static struct comedi_subdevice |
5b7dba1b | 86 | *comedi_subdevice_minor_table[COMEDI_NUM_SUBDEVICE_MINORS]; |
476b8477 | 87 | |
d9740a03 IA |
88 | static struct class *comedi_class; |
89 | static struct cdev comedi_cdev; | |
90 | ||
91 | static void comedi_device_init(struct comedi_device *dev) | |
92 | { | |
93 | spin_lock_init(&dev->spinlock); | |
94 | mutex_init(&dev->mutex); | |
95 | dev->minor = -1; | |
96 | } | |
97 | ||
98 | static void comedi_device_cleanup(struct comedi_device *dev) | |
99 | { | |
100 | struct module *driver_module = NULL; | |
101 | ||
102 | if (dev == NULL) | |
103 | return; | |
104 | mutex_lock(&dev->mutex); | |
105 | if (dev->attached) | |
106 | driver_module = dev->driver->module; | |
107 | comedi_device_detach(dev); | |
108 | while (dev->use_count > 0) { | |
109 | if (driver_module) | |
110 | module_put(driver_module); | |
111 | module_put(THIS_MODULE); | |
112 | dev->use_count--; | |
113 | } | |
114 | mutex_unlock(&dev->mutex); | |
115 | mutex_destroy(&dev->mutex); | |
116 | } | |
117 | ||
db210da2 IA |
118 | static bool comedi_clear_board_dev(struct comedi_device *dev) |
119 | { | |
120 | unsigned int i = dev->minor; | |
121 | bool cleared = false; | |
122 | ||
123 | mutex_lock(&comedi_board_minor_table_lock); | |
124 | if (dev == comedi_board_minor_table[i]) { | |
125 | comedi_board_minor_table[i] = NULL; | |
126 | cleared = true; | |
127 | } | |
128 | mutex_unlock(&comedi_board_minor_table_lock); | |
129 | return cleared; | |
130 | } | |
131 | ||
cb6b79de | 132 | static struct comedi_device *comedi_clear_board_minor(unsigned minor) |
d9740a03 | 133 | { |
cb6b79de | 134 | struct comedi_device *dev; |
d9740a03 | 135 | |
5b7dba1b | 136 | mutex_lock(&comedi_board_minor_table_lock); |
cb6b79de | 137 | dev = comedi_board_minor_table[minor]; |
5b7dba1b IA |
138 | comedi_board_minor_table[minor] = NULL; |
139 | mutex_unlock(&comedi_board_minor_table_lock); | |
cb6b79de | 140 | return dev; |
d9740a03 IA |
141 | } |
142 | ||
cb6b79de | 143 | static void comedi_free_board_dev(struct comedi_device *dev) |
d9740a03 | 144 | { |
cb6b79de IA |
145 | if (dev) { |
146 | if (dev->class_dev) { | |
147 | device_destroy(comedi_class, | |
148 | MKDEV(COMEDI_MAJOR, dev->minor)); | |
d9740a03 | 149 | } |
cb6b79de IA |
150 | comedi_device_cleanup(dev); |
151 | kfree(dev); | |
d9740a03 IA |
152 | } |
153 | } | |
8ab4ed6e | 154 | |
bd5b4173 IA |
155 | static struct comedi_subdevice |
156 | *comedi_subdevice_from_minor(unsigned minor) | |
5b7dba1b | 157 | { |
bd5b4173 | 158 | struct comedi_subdevice *s; |
5b7dba1b IA |
159 | unsigned int i = minor - COMEDI_NUM_BOARD_MINORS; |
160 | ||
161 | BUG_ON(i >= COMEDI_NUM_SUBDEVICE_MINORS); | |
162 | mutex_lock(&comedi_subdevice_minor_table_lock); | |
bd5b4173 | 163 | s = comedi_subdevice_minor_table[i]; |
5b7dba1b | 164 | mutex_unlock(&comedi_subdevice_minor_table_lock); |
bd5b4173 | 165 | return s; |
5b7dba1b IA |
166 | } |
167 | ||
f3abc831 IA |
168 | static struct comedi_device *comedi_dev_from_board_minor(unsigned minor) |
169 | { | |
cb6b79de | 170 | struct comedi_device *dev; |
f3abc831 | 171 | |
dac59de2 IA |
172 | BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS); |
173 | mutex_lock(&comedi_board_minor_table_lock); | |
cb6b79de | 174 | dev = comedi_board_minor_table[minor]; |
dac59de2 | 175 | mutex_unlock(&comedi_board_minor_table_lock); |
cb6b79de | 176 | return dev; |
f3abc831 IA |
177 | } |
178 | ||
179 | static struct comedi_device *comedi_dev_from_subdevice_minor(unsigned minor) | |
180 | { | |
bd5b4173 | 181 | struct comedi_subdevice *s; |
f3abc831 | 182 | |
bd5b4173 IA |
183 | s = comedi_subdevice_from_minor(minor); |
184 | return s ? s->device : NULL; | |
f3abc831 IA |
185 | } |
186 | ||
ba1bcf6f IA |
187 | struct comedi_device *comedi_dev_from_minor(unsigned minor) |
188 | { | |
f3abc831 IA |
189 | if (minor < COMEDI_NUM_BOARD_MINORS) |
190 | return comedi_dev_from_board_minor(minor); | |
191 | else | |
192 | return comedi_dev_from_subdevice_minor(minor); | |
ba1bcf6f | 193 | } |
85104e9b HS |
194 | EXPORT_SYMBOL_GPL(comedi_dev_from_minor); |
195 | ||
43bd33f2 | 196 | static struct comedi_subdevice * |
da56fdc6 | 197 | comedi_read_subdevice(const struct comedi_device *dev, unsigned int minor) |
43bd33f2 | 198 | { |
bd5b4173 | 199 | struct comedi_subdevice *s; |
da56fdc6 IA |
200 | |
201 | if (minor >= COMEDI_NUM_BOARD_MINORS) { | |
bd5b4173 IA |
202 | s = comedi_subdevice_from_minor(minor); |
203 | if (!s || s->device != dev) | |
da56fdc6 | 204 | return NULL; |
bd5b4173 IA |
205 | if (s->subdev_flags & SDF_CMD_READ) |
206 | return s; | |
da56fdc6 IA |
207 | } |
208 | return dev->read_subdev; | |
43bd33f2 HS |
209 | } |
210 | ||
211 | static struct comedi_subdevice * | |
da56fdc6 | 212 | comedi_write_subdevice(const struct comedi_device *dev, unsigned int minor) |
43bd33f2 | 213 | { |
bd5b4173 | 214 | struct comedi_subdevice *s; |
da56fdc6 IA |
215 | |
216 | if (minor >= COMEDI_NUM_BOARD_MINORS) { | |
bd5b4173 IA |
217 | s = comedi_subdevice_from_minor(minor); |
218 | if (!s || s->device != dev) | |
da56fdc6 | 219 | return NULL; |
bd5b4173 IA |
220 | if (s->subdev_flags & SDF_CMD_WRITE) |
221 | return s; | |
da56fdc6 IA |
222 | } |
223 | return dev->write_subdev; | |
43bd33f2 HS |
224 | } |
225 | ||
883db3d9 FMH |
226 | static int resize_async_buffer(struct comedi_device *dev, |
227 | struct comedi_subdevice *s, | |
a5011a26 HS |
228 | struct comedi_async *async, unsigned new_size) |
229 | { | |
230 | int retval; | |
231 | ||
232 | if (new_size > async->max_bufsize) | |
233 | return -EPERM; | |
234 | ||
235 | if (s->busy) { | |
236 | DPRINTK("subdevice is busy, cannot resize buffer\n"); | |
237 | return -EBUSY; | |
238 | } | |
239 | if (async->mmap_count) { | |
240 | DPRINTK("subdevice is mmapped, cannot resize buffer\n"); | |
241 | return -EBUSY; | |
242 | } | |
243 | ||
a5011a26 HS |
244 | /* make sure buffer is an integral number of pages |
245 | * (we round up) */ | |
246 | new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK; | |
247 | ||
248 | retval = comedi_buf_alloc(dev, s, new_size); | |
249 | if (retval < 0) | |
250 | return retval; | |
251 | ||
252 | if (s->buf_change) { | |
253 | retval = s->buf_change(dev, s, new_size); | |
254 | if (retval < 0) | |
255 | return retval; | |
256 | } | |
257 | ||
258 | DPRINTK("comedi%i subd %d buffer resized to %i bytes\n", | |
90a35c15 | 259 | dev->minor, s->index, async->prealloc_bufsz); |
a5011a26 HS |
260 | return 0; |
261 | } | |
262 | ||
263 | /* sysfs attribute files */ | |
264 | ||
7a4e5a9f | 265 | static ssize_t show_max_read_buffer_kb(struct device *csdev, |
a5011a26 HS |
266 | struct device_attribute *attr, char *buf) |
267 | { | |
c88db469 | 268 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
269 | struct comedi_device *dev; |
270 | struct comedi_subdevice *s; | |
72fd9fac | 271 | unsigned int size = 0; |
a5011a26 | 272 | |
5e04c254 IA |
273 | dev = comedi_dev_from_minor(minor); |
274 | if (!dev) | |
c88db469 IA |
275 | return -ENODEV; |
276 | ||
7f4656c5 | 277 | mutex_lock(&dev->mutex); |
da56fdc6 | 278 | s = comedi_read_subdevice(dev, minor); |
72fd9fac HS |
279 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
280 | size = s->async->max_bufsize / 1024; | |
7f4656c5 | 281 | mutex_unlock(&dev->mutex); |
a5011a26 | 282 | |
72fd9fac | 283 | return snprintf(buf, PAGE_SIZE, "%i\n", size); |
a5011a26 HS |
284 | } |
285 | ||
7a4e5a9f | 286 | static ssize_t store_max_read_buffer_kb(struct device *csdev, |
a5011a26 HS |
287 | struct device_attribute *attr, |
288 | const char *buf, size_t count) | |
289 | { | |
c88db469 | 290 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
291 | struct comedi_device *dev; |
292 | struct comedi_subdevice *s; | |
72fd9fac HS |
293 | unsigned int size; |
294 | int err; | |
295 | ||
296 | err = kstrtouint(buf, 10, &size); | |
297 | if (err) | |
298 | return err; | |
299 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 300 | return -EINVAL; |
72fd9fac | 301 | size *= 1024; |
a5011a26 | 302 | |
5e04c254 IA |
303 | dev = comedi_dev_from_minor(minor); |
304 | if (!dev) | |
c88db469 IA |
305 | return -ENODEV; |
306 | ||
7f4656c5 | 307 | mutex_lock(&dev->mutex); |
da56fdc6 | 308 | s = comedi_read_subdevice(dev, minor); |
72fd9fac HS |
309 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
310 | s->async->max_bufsize = size; | |
311 | else | |
312 | err = -EINVAL; | |
7f4656c5 | 313 | mutex_unlock(&dev->mutex); |
a5011a26 | 314 | |
72fd9fac | 315 | return err ? err : count; |
a5011a26 HS |
316 | } |
317 | ||
7a4e5a9f | 318 | static ssize_t show_read_buffer_kb(struct device *csdev, |
a5011a26 HS |
319 | struct device_attribute *attr, char *buf) |
320 | { | |
c88db469 | 321 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
322 | struct comedi_device *dev; |
323 | struct comedi_subdevice *s; | |
72fd9fac | 324 | unsigned int size = 0; |
a5011a26 | 325 | |
5e04c254 IA |
326 | dev = comedi_dev_from_minor(minor); |
327 | if (!dev) | |
c88db469 IA |
328 | return -ENODEV; |
329 | ||
7f4656c5 | 330 | mutex_lock(&dev->mutex); |
da56fdc6 | 331 | s = comedi_read_subdevice(dev, minor); |
72fd9fac HS |
332 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
333 | size = s->async->prealloc_bufsz / 1024; | |
7f4656c5 | 334 | mutex_unlock(&dev->mutex); |
a5011a26 | 335 | |
72fd9fac | 336 | return snprintf(buf, PAGE_SIZE, "%i\n", size); |
a5011a26 HS |
337 | } |
338 | ||
7a4e5a9f | 339 | static ssize_t store_read_buffer_kb(struct device *csdev, |
a5011a26 HS |
340 | struct device_attribute *attr, |
341 | const char *buf, size_t count) | |
342 | { | |
c88db469 | 343 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
344 | struct comedi_device *dev; |
345 | struct comedi_subdevice *s; | |
72fd9fac HS |
346 | unsigned int size; |
347 | int err; | |
348 | ||
349 | err = kstrtouint(buf, 10, &size); | |
350 | if (err) | |
351 | return err; | |
352 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 353 | return -EINVAL; |
72fd9fac | 354 | size *= 1024; |
a5011a26 | 355 | |
5e04c254 IA |
356 | dev = comedi_dev_from_minor(minor); |
357 | if (!dev) | |
c88db469 IA |
358 | return -ENODEV; |
359 | ||
7f4656c5 | 360 | mutex_lock(&dev->mutex); |
da56fdc6 | 361 | s = comedi_read_subdevice(dev, minor); |
72fd9fac | 362 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
7f4656c5 | 363 | err = resize_async_buffer(dev, s, s->async, size); |
72fd9fac HS |
364 | else |
365 | err = -EINVAL; | |
7f4656c5 | 366 | mutex_unlock(&dev->mutex); |
a5011a26 | 367 | |
72fd9fac | 368 | return err ? err : count; |
a5011a26 | 369 | } |
883db3d9 | 370 | |
7a4e5a9f | 371 | static ssize_t show_max_write_buffer_kb(struct device *csdev, |
a5011a26 HS |
372 | struct device_attribute *attr, |
373 | char *buf) | |
374 | { | |
c88db469 | 375 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
376 | struct comedi_device *dev; |
377 | struct comedi_subdevice *s; | |
72fd9fac | 378 | unsigned int size = 0; |
a5011a26 | 379 | |
5e04c254 IA |
380 | dev = comedi_dev_from_minor(minor); |
381 | if (!dev) | |
c88db469 IA |
382 | return -ENODEV; |
383 | ||
7f4656c5 | 384 | mutex_lock(&dev->mutex); |
da56fdc6 | 385 | s = comedi_write_subdevice(dev, minor); |
72fd9fac HS |
386 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
387 | size = s->async->max_bufsize / 1024; | |
7f4656c5 | 388 | mutex_unlock(&dev->mutex); |
a5011a26 | 389 | |
72fd9fac | 390 | return snprintf(buf, PAGE_SIZE, "%i\n", size); |
a5011a26 HS |
391 | } |
392 | ||
7a4e5a9f | 393 | static ssize_t store_max_write_buffer_kb(struct device *csdev, |
a5011a26 HS |
394 | struct device_attribute *attr, |
395 | const char *buf, size_t count) | |
396 | { | |
c88db469 | 397 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
398 | struct comedi_device *dev; |
399 | struct comedi_subdevice *s; | |
72fd9fac HS |
400 | unsigned int size; |
401 | int err; | |
402 | ||
403 | err = kstrtouint(buf, 10, &size); | |
404 | if (err) | |
405 | return err; | |
406 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 407 | return -EINVAL; |
72fd9fac | 408 | size *= 1024; |
a5011a26 | 409 | |
5e04c254 IA |
410 | dev = comedi_dev_from_minor(minor); |
411 | if (!dev) | |
c88db469 IA |
412 | return -ENODEV; |
413 | ||
7f4656c5 | 414 | mutex_lock(&dev->mutex); |
da56fdc6 | 415 | s = comedi_write_subdevice(dev, minor); |
72fd9fac HS |
416 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
417 | s->async->max_bufsize = size; | |
418 | else | |
419 | err = -EINVAL; | |
7f4656c5 | 420 | mutex_unlock(&dev->mutex); |
a5011a26 | 421 | |
72fd9fac | 422 | return err ? err : count; |
a5011a26 HS |
423 | } |
424 | ||
7a4e5a9f | 425 | static ssize_t show_write_buffer_kb(struct device *csdev, |
a5011a26 HS |
426 | struct device_attribute *attr, char *buf) |
427 | { | |
c88db469 | 428 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
429 | struct comedi_device *dev; |
430 | struct comedi_subdevice *s; | |
72fd9fac | 431 | unsigned int size = 0; |
a5011a26 | 432 | |
5e04c254 IA |
433 | dev = comedi_dev_from_minor(minor); |
434 | if (!dev) | |
c88db469 IA |
435 | return -ENODEV; |
436 | ||
7f4656c5 | 437 | mutex_lock(&dev->mutex); |
da56fdc6 | 438 | s = comedi_write_subdevice(dev, minor); |
72fd9fac HS |
439 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
440 | size = s->async->prealloc_bufsz / 1024; | |
7f4656c5 | 441 | mutex_unlock(&dev->mutex); |
a5011a26 | 442 | |
72fd9fac | 443 | return snprintf(buf, PAGE_SIZE, "%i\n", size); |
a5011a26 HS |
444 | } |
445 | ||
7a4e5a9f | 446 | static ssize_t store_write_buffer_kb(struct device *csdev, |
a5011a26 HS |
447 | struct device_attribute *attr, |
448 | const char *buf, size_t count) | |
449 | { | |
c88db469 | 450 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
451 | struct comedi_device *dev; |
452 | struct comedi_subdevice *s; | |
72fd9fac HS |
453 | unsigned int size; |
454 | int err; | |
455 | ||
456 | err = kstrtouint(buf, 10, &size); | |
457 | if (err) | |
458 | return err; | |
459 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 460 | return -EINVAL; |
72fd9fac | 461 | size *= 1024; |
a5011a26 | 462 | |
5e04c254 IA |
463 | dev = comedi_dev_from_minor(minor); |
464 | if (!dev) | |
c88db469 IA |
465 | return -ENODEV; |
466 | ||
7f4656c5 | 467 | mutex_lock(&dev->mutex); |
da56fdc6 | 468 | s = comedi_write_subdevice(dev, minor); |
72fd9fac | 469 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
7f4656c5 | 470 | err = resize_async_buffer(dev, s, s->async, size); |
72fd9fac HS |
471 | else |
472 | err = -EINVAL; | |
7f4656c5 | 473 | mutex_unlock(&dev->mutex); |
a5011a26 | 474 | |
72fd9fac | 475 | return err ? err : count; |
a5011a26 HS |
476 | } |
477 | ||
fb60367d HS |
478 | static struct device_attribute comedi_dev_attrs[] = { |
479 | __ATTR(max_read_buffer_kb, S_IRUGO | S_IWUSR, | |
480 | show_max_read_buffer_kb, store_max_read_buffer_kb), | |
481 | __ATTR(read_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP, | |
482 | show_read_buffer_kb, store_read_buffer_kb), | |
483 | __ATTR(max_write_buffer_kb, S_IRUGO | S_IWUSR, | |
484 | show_max_write_buffer_kb, store_max_write_buffer_kb), | |
485 | __ATTR(write_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP, | |
486 | show_write_buffer_kb, store_write_buffer_kb), | |
487 | __ATTR_NULL | |
a5011a26 | 488 | }; |
ed9eccbe | 489 | |
2aae0076 HS |
490 | static void comedi_set_subdevice_runflags(struct comedi_subdevice *s, |
491 | unsigned mask, unsigned bits) | |
492 | { | |
493 | unsigned long flags; | |
494 | ||
495 | spin_lock_irqsave(&s->spin_lock, flags); | |
496 | s->runflags &= ~mask; | |
497 | s->runflags |= (bits & mask); | |
498 | spin_unlock_irqrestore(&s->spin_lock, flags); | |
499 | } | |
500 | ||
ade1764f | 501 | static unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s) |
74120719 HS |
502 | { |
503 | unsigned long flags; | |
504 | unsigned runflags; | |
505 | ||
506 | spin_lock_irqsave(&s->spin_lock, flags); | |
507 | runflags = s->runflags; | |
508 | spin_unlock_irqrestore(&s->spin_lock, flags); | |
509 | return runflags; | |
510 | } | |
74120719 | 511 | |
e0dac318 HS |
512 | bool comedi_is_subdevice_running(struct comedi_subdevice *s) |
513 | { | |
514 | unsigned runflags = comedi_get_subdevice_runflags(s); | |
515 | ||
516 | return (runflags & SRF_RUNNING) ? true : false; | |
517 | } | |
518 | EXPORT_SYMBOL_GPL(comedi_is_subdevice_running); | |
519 | ||
c098c21a HS |
520 | static bool comedi_is_subdevice_in_error(struct comedi_subdevice *s) |
521 | { | |
522 | unsigned runflags = comedi_get_subdevice_runflags(s); | |
523 | ||
524 | return (runflags & SRF_ERROR) ? true : false; | |
525 | } | |
526 | ||
9682e28c HS |
527 | static bool comedi_is_subdevice_idle(struct comedi_subdevice *s) |
528 | { | |
529 | unsigned runflags = comedi_get_subdevice_runflags(s); | |
530 | ||
531 | return (runflags & (SRF_ERROR | SRF_RUNNING)) ? false : true; | |
532 | } | |
533 | ||
588ba6dc HS |
534 | /** |
535 | * comedi_set_spriv() - Set the subdevice private data pointer. | |
536 | * @s: comedi_subdevice struct | |
537 | * @data: pointer to the private data | |
538 | * | |
539 | * This also sets the subdevice runflags to allow the core to automatically | |
540 | * free the private data during the detach. | |
541 | */ | |
542 | void comedi_set_spriv(struct comedi_subdevice *s, void *data) | |
543 | { | |
544 | s->private = data; | |
545 | comedi_set_subdevice_runflags(s, ~0, SRF_FREE_SPRIV); | |
546 | } | |
547 | EXPORT_SYMBOL_GPL(comedi_set_spriv); | |
548 | ||
2aae0076 HS |
549 | /* |
550 | This function restores a subdevice to an idle state. | |
551 | */ | |
552 | static void do_become_nonbusy(struct comedi_device *dev, | |
553 | struct comedi_subdevice *s) | |
554 | { | |
555 | struct comedi_async *async = s->async; | |
556 | ||
557 | comedi_set_subdevice_runflags(s, SRF_RUNNING, 0); | |
558 | if (async) { | |
61c9fb0e | 559 | comedi_buf_reset(async); |
2aae0076 HS |
560 | async->inttrig = NULL; |
561 | kfree(async->cmd.chanlist); | |
562 | async->cmd.chanlist = NULL; | |
563 | } else { | |
564 | dev_err(dev->class_dev, | |
565 | "BUG: (?) do_become_nonbusy called with async=NULL\n"); | |
566 | } | |
567 | ||
568 | s->busy = NULL; | |
569 | } | |
570 | ||
571 | static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s) | |
572 | { | |
573 | int ret = 0; | |
574 | ||
f0124630 | 575 | if (comedi_is_subdevice_running(s) && s->cancel) |
2aae0076 HS |
576 | ret = s->cancel(dev, s); |
577 | ||
578 | do_become_nonbusy(dev, s); | |
579 | ||
580 | return ret; | |
581 | } | |
582 | ||
583 | static int is_device_busy(struct comedi_device *dev) | |
584 | { | |
585 | struct comedi_subdevice *s; | |
586 | int i; | |
587 | ||
588 | if (!dev->attached) | |
589 | return 0; | |
590 | ||
591 | for (i = 0; i < dev->n_subdevices; i++) { | |
592 | s = &dev->subdevices[i]; | |
593 | if (s->busy) | |
594 | return 1; | |
595 | if (s->async && s->async->mmap_count) | |
596 | return 1; | |
597 | } | |
598 | ||
599 | return 0; | |
600 | } | |
601 | ||
ed9eccbe DS |
602 | /* |
603 | COMEDI_DEVCONFIG | |
604 | device config ioctl | |
605 | ||
606 | arg: | |
607 | pointer to devconfig structure | |
608 | ||
609 | reads: | |
610 | devconfig structure at arg | |
611 | ||
612 | writes: | |
613 | none | |
614 | */ | |
0a85b6f0 | 615 | static int do_devconfig_ioctl(struct comedi_device *dev, |
92d0127c | 616 | struct comedi_devconfig __user *arg) |
ed9eccbe | 617 | { |
0707bb04 | 618 | struct comedi_devconfig it; |
ed9eccbe DS |
619 | |
620 | if (!capable(CAP_SYS_ADMIN)) | |
621 | return -EPERM; | |
622 | ||
623 | if (arg == NULL) { | |
624 | if (is_device_busy(dev)) | |
625 | return -EBUSY; | |
476b8477 | 626 | if (dev->attached) { |
ed9eccbe DS |
627 | struct module *driver_module = dev->driver->module; |
628 | comedi_device_detach(dev); | |
629 | module_put(driver_module); | |
630 | } | |
631 | return 0; | |
632 | } | |
633 | ||
bc252fd1 | 634 | if (copy_from_user(&it, arg, sizeof(it))) |
ed9eccbe DS |
635 | return -EFAULT; |
636 | ||
637 | it.board_name[COMEDI_NAMELEN - 1] = 0; | |
638 | ||
d1843132 HS |
639 | if (it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) { |
640 | dev_warn(dev->class_dev, | |
641 | "comedi_config --init_data is deprecated\n"); | |
642 | return -EINVAL; | |
ed9eccbe DS |
643 | } |
644 | ||
8ab4ed6e IA |
645 | if (dev->minor >= comedi_num_legacy_minors) |
646 | /* don't re-use dynamically allocated comedi devices */ | |
647 | return -EBUSY; | |
648 | ||
b2a644b4 IA |
649 | /* This increments the driver module count on success. */ |
650 | return comedi_device_attach(dev, &it); | |
ed9eccbe DS |
651 | } |
652 | ||
653 | /* | |
654 | COMEDI_BUFCONFIG | |
655 | buffer configuration ioctl | |
656 | ||
657 | arg: | |
658 | pointer to bufconfig structure | |
659 | ||
660 | reads: | |
661 | bufconfig at arg | |
662 | ||
663 | writes: | |
664 | modified bufconfig at arg | |
665 | ||
666 | */ | |
92d0127c GKH |
667 | static int do_bufconfig_ioctl(struct comedi_device *dev, |
668 | struct comedi_bufconfig __user *arg) | |
ed9eccbe | 669 | { |
be6aba4a | 670 | struct comedi_bufconfig bc; |
d163679c | 671 | struct comedi_async *async; |
34c43922 | 672 | struct comedi_subdevice *s; |
883db3d9 | 673 | int retval = 0; |
ed9eccbe | 674 | |
bc252fd1 | 675 | if (copy_from_user(&bc, arg, sizeof(bc))) |
ed9eccbe DS |
676 | return -EFAULT; |
677 | ||
11f80ddf | 678 | if (bc.subdevice >= dev->n_subdevices) |
ed9eccbe DS |
679 | return -EINVAL; |
680 | ||
b077f2cd | 681 | s = &dev->subdevices[bc.subdevice]; |
ed9eccbe DS |
682 | async = s->async; |
683 | ||
684 | if (!async) { | |
685 | DPRINTK("subdevice does not have async capability\n"); | |
686 | bc.size = 0; | |
687 | bc.maximum_size = 0; | |
688 | goto copyback; | |
689 | } | |
690 | ||
691 | if (bc.maximum_size) { | |
692 | if (!capable(CAP_SYS_ADMIN)) | |
693 | return -EPERM; | |
694 | ||
695 | async->max_bufsize = bc.maximum_size; | |
696 | } | |
697 | ||
698 | if (bc.size) { | |
883db3d9 FMH |
699 | retval = resize_async_buffer(dev, s, async, bc.size); |
700 | if (retval < 0) | |
701 | return retval; | |
ed9eccbe DS |
702 | } |
703 | ||
704 | bc.size = async->prealloc_bufsz; | |
705 | bc.maximum_size = async->max_bufsize; | |
706 | ||
476b8477 | 707 | copyback: |
bc252fd1 | 708 | if (copy_to_user(arg, &bc, sizeof(bc))) |
ed9eccbe DS |
709 | return -EFAULT; |
710 | ||
711 | return 0; | |
712 | } | |
713 | ||
714 | /* | |
715 | COMEDI_DEVINFO | |
716 | device info ioctl | |
717 | ||
718 | arg: | |
719 | pointer to devinfo structure | |
720 | ||
721 | reads: | |
722 | none | |
723 | ||
724 | writes: | |
725 | devinfo structure | |
726 | ||
727 | */ | |
0a85b6f0 | 728 | static int do_devinfo_ioctl(struct comedi_device *dev, |
92d0127c GKH |
729 | struct comedi_devinfo __user *arg, |
730 | struct file *file) | |
ed9eccbe | 731 | { |
6131ffaa | 732 | const unsigned minor = iminor(file_inode(file)); |
0e700923 HS |
733 | struct comedi_subdevice *s; |
734 | struct comedi_devinfo devinfo; | |
ed9eccbe DS |
735 | |
736 | memset(&devinfo, 0, sizeof(devinfo)); | |
737 | ||
738 | /* fill devinfo structure */ | |
739 | devinfo.version_code = COMEDI_VERSION_CODE; | |
740 | devinfo.n_subdevs = dev->n_subdevices; | |
819cbb12 VK |
741 | strlcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN); |
742 | strlcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN); | |
ed9eccbe | 743 | |
da56fdc6 | 744 | s = comedi_read_subdevice(dev, minor); |
0e700923 | 745 | if (s) |
90a35c15 | 746 | devinfo.read_subdevice = s->index; |
476b8477 | 747 | else |
ed9eccbe | 748 | devinfo.read_subdevice = -1; |
476b8477 | 749 | |
da56fdc6 | 750 | s = comedi_write_subdevice(dev, minor); |
0e700923 | 751 | if (s) |
90a35c15 | 752 | devinfo.write_subdevice = s->index; |
476b8477 | 753 | else |
ed9eccbe | 754 | devinfo.write_subdevice = -1; |
ed9eccbe | 755 | |
bc252fd1 | 756 | if (copy_to_user(arg, &devinfo, sizeof(devinfo))) |
ed9eccbe DS |
757 | return -EFAULT; |
758 | ||
759 | return 0; | |
760 | } | |
761 | ||
762 | /* | |
763 | COMEDI_SUBDINFO | |
764 | subdevice info ioctl | |
765 | ||
766 | arg: | |
767 | pointer to array of subdevice info structures | |
768 | ||
769 | reads: | |
770 | none | |
771 | ||
772 | writes: | |
773 | array of subdevice info structures at arg | |
774 | ||
775 | */ | |
0a85b6f0 | 776 | static int do_subdinfo_ioctl(struct comedi_device *dev, |
92d0127c | 777 | struct comedi_subdinfo __user *arg, void *file) |
ed9eccbe DS |
778 | { |
779 | int ret, i; | |
bd52efbb | 780 | struct comedi_subdinfo *tmp, *us; |
34c43922 | 781 | struct comedi_subdevice *s; |
ed9eccbe | 782 | |
bc252fd1 | 783 | tmp = kcalloc(dev->n_subdevices, sizeof(*tmp), GFP_KERNEL); |
ed9eccbe DS |
784 | if (!tmp) |
785 | return -ENOMEM; | |
786 | ||
787 | /* fill subdinfo structs */ | |
788 | for (i = 0; i < dev->n_subdevices; i++) { | |
b077f2cd | 789 | s = &dev->subdevices[i]; |
ed9eccbe DS |
790 | us = tmp + i; |
791 | ||
792 | us->type = s->type; | |
793 | us->n_chan = s->n_chan; | |
794 | us->subd_flags = s->subdev_flags; | |
f0124630 | 795 | if (comedi_is_subdevice_running(s)) |
ed9eccbe DS |
796 | us->subd_flags |= SDF_RUNNING; |
797 | #define TIMER_nanosec 5 /* backwards compatibility */ | |
798 | us->timer_type = TIMER_nanosec; | |
799 | us->len_chanlist = s->len_chanlist; | |
800 | us->maxdata = s->maxdata; | |
801 | if (s->range_table) { | |
802 | us->range_type = | |
476b8477 | 803 | (i << 24) | (0 << 16) | (s->range_table->length); |
ed9eccbe DS |
804 | } else { |
805 | us->range_type = 0; /* XXX */ | |
806 | } | |
807 | us->flags = s->flags; | |
808 | ||
809 | if (s->busy) | |
810 | us->subd_flags |= SDF_BUSY; | |
811 | if (s->busy == file) | |
812 | us->subd_flags |= SDF_BUSY_OWNER; | |
813 | if (s->lock) | |
814 | us->subd_flags |= SDF_LOCKED; | |
815 | if (s->lock == file) | |
816 | us->subd_flags |= SDF_LOCK_OWNER; | |
817 | if (!s->maxdata && s->maxdata_list) | |
818 | us->subd_flags |= SDF_MAXDATA; | |
819 | if (s->flaglist) | |
820 | us->subd_flags |= SDF_FLAGS; | |
821 | if (s->range_table_list) | |
822 | us->subd_flags |= SDF_RANGETYPE; | |
823 | if (s->do_cmd) | |
824 | us->subd_flags |= SDF_CMD; | |
825 | ||
826 | if (s->insn_bits != &insn_inval) | |
827 | us->insn_bits_support = COMEDI_SUPPORTED; | |
828 | else | |
829 | us->insn_bits_support = COMEDI_UNSUPPORTED; | |
830 | ||
831 | us->settling_time_0 = s->settling_time_0; | |
832 | } | |
833 | ||
bc252fd1 | 834 | ret = copy_to_user(arg, tmp, dev->n_subdevices * sizeof(*tmp)); |
ed9eccbe DS |
835 | |
836 | kfree(tmp); | |
837 | ||
838 | return ret ? -EFAULT : 0; | |
839 | } | |
840 | ||
841 | /* | |
842 | COMEDI_CHANINFO | |
843 | subdevice info ioctl | |
844 | ||
845 | arg: | |
846 | pointer to chaninfo structure | |
847 | ||
848 | reads: | |
849 | chaninfo structure at arg | |
850 | ||
851 | writes: | |
852 | arrays at elements of chaninfo structure | |
853 | ||
854 | */ | |
0a85b6f0 | 855 | static int do_chaninfo_ioctl(struct comedi_device *dev, |
92d0127c | 856 | struct comedi_chaninfo __user *arg) |
ed9eccbe | 857 | { |
34c43922 | 858 | struct comedi_subdevice *s; |
a18b416d | 859 | struct comedi_chaninfo it; |
ed9eccbe | 860 | |
bc252fd1 | 861 | if (copy_from_user(&it, arg, sizeof(it))) |
ed9eccbe DS |
862 | return -EFAULT; |
863 | ||
864 | if (it.subdev >= dev->n_subdevices) | |
865 | return -EINVAL; | |
b077f2cd | 866 | s = &dev->subdevices[it.subdev]; |
ed9eccbe DS |
867 | |
868 | if (it.maxdata_list) { | |
869 | if (s->maxdata || !s->maxdata_list) | |
870 | return -EINVAL; | |
871 | if (copy_to_user(it.maxdata_list, s->maxdata_list, | |
790c5541 | 872 | s->n_chan * sizeof(unsigned int))) |
ed9eccbe DS |
873 | return -EFAULT; |
874 | } | |
875 | ||
876 | if (it.flaglist) { | |
877 | if (!s->flaglist) | |
878 | return -EINVAL; | |
879 | if (copy_to_user(it.flaglist, s->flaglist, | |
476b8477 | 880 | s->n_chan * sizeof(unsigned int))) |
ed9eccbe DS |
881 | return -EFAULT; |
882 | } | |
883 | ||
884 | if (it.rangelist) { | |
885 | int i; | |
886 | ||
887 | if (!s->range_table_list) | |
888 | return -EINVAL; | |
889 | for (i = 0; i < s->n_chan; i++) { | |
890 | int x; | |
891 | ||
892 | x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) | | |
476b8477 | 893 | (s->range_table_list[i]->length); |
81604d43 VK |
894 | if (put_user(x, it.rangelist + i)) |
895 | return -EFAULT; | |
ed9eccbe | 896 | } |
476b8477 GKH |
897 | #if 0 |
898 | if (copy_to_user(it.rangelist, s->range_type_list, | |
0a85b6f0 | 899 | s->n_chan * sizeof(unsigned int))) |
476b8477 GKH |
900 | return -EFAULT; |
901 | #endif | |
ed9eccbe DS |
902 | } |
903 | ||
904 | return 0; | |
905 | } | |
906 | ||
907 | /* | |
908 | COMEDI_BUFINFO | |
909 | buffer information ioctl | |
910 | ||
911 | arg: | |
912 | pointer to bufinfo structure | |
913 | ||
914 | reads: | |
915 | bufinfo at arg | |
916 | ||
917 | writes: | |
918 | modified bufinfo at arg | |
919 | ||
920 | */ | |
92d0127c | 921 | static int do_bufinfo_ioctl(struct comedi_device *dev, |
53fa827e | 922 | struct comedi_bufinfo __user *arg, void *file) |
ed9eccbe | 923 | { |
9aa5339a | 924 | struct comedi_bufinfo bi; |
34c43922 | 925 | struct comedi_subdevice *s; |
d163679c | 926 | struct comedi_async *async; |
ed9eccbe | 927 | |
bc252fd1 | 928 | if (copy_from_user(&bi, arg, sizeof(bi))) |
ed9eccbe DS |
929 | return -EFAULT; |
930 | ||
7b1a5e2f | 931 | if (bi.subdevice >= dev->n_subdevices) |
ed9eccbe DS |
932 | return -EINVAL; |
933 | ||
b077f2cd | 934 | s = &dev->subdevices[bi.subdevice]; |
53fa827e IA |
935 | |
936 | if (s->lock && s->lock != file) | |
937 | return -EACCES; | |
938 | ||
ed9eccbe DS |
939 | async = s->async; |
940 | ||
941 | if (!async) { | |
942 | DPRINTK("subdevice does not have async capability\n"); | |
943 | bi.buf_write_ptr = 0; | |
944 | bi.buf_read_ptr = 0; | |
945 | bi.buf_write_count = 0; | |
946 | bi.buf_read_count = 0; | |
4772c018 IA |
947 | bi.bytes_read = 0; |
948 | bi.bytes_written = 0; | |
ed9eccbe DS |
949 | goto copyback; |
950 | } | |
53fa827e IA |
951 | if (!s->busy) { |
952 | bi.bytes_read = 0; | |
953 | bi.bytes_written = 0; | |
954 | goto copyback_position; | |
955 | } | |
956 | if (s->busy != file) | |
957 | return -EACCES; | |
ed9eccbe DS |
958 | |
959 | if (bi.bytes_read && (s->subdev_flags & SDF_CMD_READ)) { | |
960 | bi.bytes_read = comedi_buf_read_alloc(async, bi.bytes_read); | |
961 | comedi_buf_read_free(async, bi.bytes_read); | |
962 | ||
9682e28c HS |
963 | if (comedi_is_subdevice_idle(s) && |
964 | async->buf_write_count == async->buf_read_count) { | |
ed9eccbe DS |
965 | do_become_nonbusy(dev, s); |
966 | } | |
967 | } | |
968 | ||
969 | if (bi.bytes_written && (s->subdev_flags & SDF_CMD_WRITE)) { | |
970 | bi.bytes_written = | |
476b8477 | 971 | comedi_buf_write_alloc(async, bi.bytes_written); |
ed9eccbe DS |
972 | comedi_buf_write_free(async, bi.bytes_written); |
973 | } | |
974 | ||
53fa827e | 975 | copyback_position: |
ed9eccbe DS |
976 | bi.buf_write_count = async->buf_write_count; |
977 | bi.buf_write_ptr = async->buf_write_ptr; | |
978 | bi.buf_read_count = async->buf_read_count; | |
979 | bi.buf_read_ptr = async->buf_read_ptr; | |
980 | ||
476b8477 | 981 | copyback: |
bc252fd1 | 982 | if (copy_to_user(arg, &bi, sizeof(bi))) |
ed9eccbe DS |
983 | return -EFAULT; |
984 | ||
985 | return 0; | |
986 | } | |
987 | ||
0a85b6f0 MT |
988 | static int check_insn_config_length(struct comedi_insn *insn, |
989 | unsigned int *data) | |
ed9eccbe | 990 | { |
476b8477 GKH |
991 | if (insn->n < 1) |
992 | return -EINVAL; | |
ed9eccbe DS |
993 | |
994 | switch (data[0]) { | |
995 | case INSN_CONFIG_DIO_OUTPUT: | |
996 | case INSN_CONFIG_DIO_INPUT: | |
997 | case INSN_CONFIG_DISARM: | |
998 | case INSN_CONFIG_RESET: | |
999 | if (insn->n == 1) | |
1000 | return 0; | |
1001 | break; | |
1002 | case INSN_CONFIG_ARM: | |
1003 | case INSN_CONFIG_DIO_QUERY: | |
1004 | case INSN_CONFIG_BLOCK_SIZE: | |
1005 | case INSN_CONFIG_FILTER: | |
1006 | case INSN_CONFIG_SERIAL_CLOCK: | |
1007 | case INSN_CONFIG_BIDIRECTIONAL_DATA: | |
1008 | case INSN_CONFIG_ALT_SOURCE: | |
1009 | case INSN_CONFIG_SET_COUNTER_MODE: | |
1010 | case INSN_CONFIG_8254_READ_STATUS: | |
1011 | case INSN_CONFIG_SET_ROUTING: | |
1012 | case INSN_CONFIG_GET_ROUTING: | |
1013 | case INSN_CONFIG_GET_PWM_STATUS: | |
1014 | case INSN_CONFIG_PWM_SET_PERIOD: | |
1015 | case INSN_CONFIG_PWM_GET_PERIOD: | |
1016 | if (insn->n == 2) | |
1017 | return 0; | |
1018 | break; | |
1019 | case INSN_CONFIG_SET_GATE_SRC: | |
1020 | case INSN_CONFIG_GET_GATE_SRC: | |
1021 | case INSN_CONFIG_SET_CLOCK_SRC: | |
1022 | case INSN_CONFIG_GET_CLOCK_SRC: | |
1023 | case INSN_CONFIG_SET_OTHER_SRC: | |
1024 | case INSN_CONFIG_GET_COUNTER_STATUS: | |
1025 | case INSN_CONFIG_PWM_SET_H_BRIDGE: | |
1026 | case INSN_CONFIG_PWM_GET_H_BRIDGE: | |
1027 | case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE: | |
1028 | if (insn->n == 3) | |
1029 | return 0; | |
1030 | break; | |
1031 | case INSN_CONFIG_PWM_OUTPUT: | |
1032 | case INSN_CONFIG_ANALOG_TRIG: | |
1033 | if (insn->n == 5) | |
1034 | return 0; | |
1035 | break; | |
b0a2b6d8 IA |
1036 | case INSN_CONFIG_DIGITAL_TRIG: |
1037 | if (insn->n == 6) | |
1038 | return 0; | |
1039 | break; | |
0a85b6f0 MT |
1040 | /* by default we allow the insn since we don't have checks for |
1041 | * all possible cases yet */ | |
ed9eccbe | 1042 | default: |
4f870fe6 IA |
1043 | pr_warn("comedi: No check for data length of config insn id %i is implemented.\n", |
1044 | data[0]); | |
1045 | pr_warn("comedi: Add a check to %s in %s.\n", | |
1046 | __func__, __FILE__); | |
1047 | pr_warn("comedi: Assuming n=%i is correct.\n", insn->n); | |
ed9eccbe | 1048 | return 0; |
ed9eccbe DS |
1049 | } |
1050 | return -EINVAL; | |
1051 | } | |
1052 | ||
0a85b6f0 MT |
1053 | static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn, |
1054 | unsigned int *data, void *file) | |
ed9eccbe | 1055 | { |
34c43922 | 1056 | struct comedi_subdevice *s; |
ed9eccbe DS |
1057 | int ret = 0; |
1058 | int i; | |
1059 | ||
1060 | if (insn->insn & INSN_MASK_SPECIAL) { | |
1061 | /* a non-subdevice instruction */ | |
1062 | ||
1063 | switch (insn->insn) { | |
1064 | case INSN_GTOD: | |
1065 | { | |
1066 | struct timeval tv; | |
1067 | ||
1068 | if (insn->n != 2) { | |
1069 | ret = -EINVAL; | |
1070 | break; | |
1071 | } | |
1072 | ||
1073 | do_gettimeofday(&tv); | |
1074 | data[0] = tv.tv_sec; | |
1075 | data[1] = tv.tv_usec; | |
1076 | ret = 2; | |
1077 | ||
1078 | break; | |
1079 | } | |
1080 | case INSN_WAIT: | |
1081 | if (insn->n != 1 || data[0] >= 100000) { | |
1082 | ret = -EINVAL; | |
1083 | break; | |
1084 | } | |
1085 | udelay(data[0] / 1000); | |
1086 | ret = 1; | |
1087 | break; | |
1088 | case INSN_INTTRIG: | |
1089 | if (insn->n != 1) { | |
1090 | ret = -EINVAL; | |
1091 | break; | |
1092 | } | |
1093 | if (insn->subdev >= dev->n_subdevices) { | |
1094 | DPRINTK("%d not usable subdevice\n", | |
1095 | insn->subdev); | |
1096 | ret = -EINVAL; | |
1097 | break; | |
1098 | } | |
b077f2cd | 1099 | s = &dev->subdevices[insn->subdev]; |
ed9eccbe DS |
1100 | if (!s->async) { |
1101 | DPRINTK("no async\n"); | |
1102 | ret = -EINVAL; | |
1103 | break; | |
1104 | } | |
1105 | if (!s->async->inttrig) { | |
1106 | DPRINTK("no inttrig\n"); | |
1107 | ret = -EAGAIN; | |
1108 | break; | |
1109 | } | |
5d06e3df | 1110 | ret = s->async->inttrig(dev, s, data[0]); |
ed9eccbe DS |
1111 | if (ret >= 0) |
1112 | ret = 1; | |
1113 | break; | |
1114 | default: | |
1115 | DPRINTK("invalid insn\n"); | |
1116 | ret = -EINVAL; | |
1117 | break; | |
1118 | } | |
1119 | } else { | |
1120 | /* a subdevice instruction */ | |
790c5541 | 1121 | unsigned int maxdata; |
ed9eccbe DS |
1122 | |
1123 | if (insn->subdev >= dev->n_subdevices) { | |
1124 | DPRINTK("subdevice %d out of range\n", insn->subdev); | |
1125 | ret = -EINVAL; | |
1126 | goto out; | |
1127 | } | |
b077f2cd | 1128 | s = &dev->subdevices[insn->subdev]; |
ed9eccbe DS |
1129 | |
1130 | if (s->type == COMEDI_SUBD_UNUSED) { | |
1131 | DPRINTK("%d not usable subdevice\n", insn->subdev); | |
1132 | ret = -EIO; | |
1133 | goto out; | |
1134 | } | |
1135 | ||
1136 | /* are we locked? (ioctl lock) */ | |
1137 | if (s->lock && s->lock != file) { | |
1138 | DPRINTK("device locked\n"); | |
1139 | ret = -EACCES; | |
1140 | goto out; | |
1141 | } | |
1142 | ||
0fd0ca75 | 1143 | ret = comedi_check_chanlist(s, 1, &insn->chanspec); |
476b8477 | 1144 | if (ret < 0) { |
ed9eccbe DS |
1145 | ret = -EINVAL; |
1146 | DPRINTK("bad chanspec\n"); | |
1147 | goto out; | |
1148 | } | |
1149 | ||
1150 | if (s->busy) { | |
1151 | ret = -EBUSY; | |
1152 | goto out; | |
1153 | } | |
1154 | /* This looks arbitrary. It is. */ | |
1155 | s->busy = &parse_insn; | |
1156 | switch (insn->insn) { | |
1157 | case INSN_READ: | |
1158 | ret = s->insn_read(dev, s, insn, data); | |
1159 | break; | |
1160 | case INSN_WRITE: | |
1161 | maxdata = s->maxdata_list | |
476b8477 GKH |
1162 | ? s->maxdata_list[CR_CHAN(insn->chanspec)] |
1163 | : s->maxdata; | |
ed9eccbe DS |
1164 | for (i = 0; i < insn->n; ++i) { |
1165 | if (data[i] > maxdata) { | |
1166 | ret = -EINVAL; | |
1167 | DPRINTK("bad data value(s)\n"); | |
1168 | break; | |
1169 | } | |
1170 | } | |
1171 | if (ret == 0) | |
1172 | ret = s->insn_write(dev, s, insn, data); | |
1173 | break; | |
1174 | case INSN_BITS: | |
1175 | if (insn->n != 2) { | |
1176 | ret = -EINVAL; | |
2f644ccf IA |
1177 | } else { |
1178 | /* Most drivers ignore the base channel in | |
1179 | * insn->chanspec. Fix this here if | |
1180 | * the subdevice has <= 32 channels. */ | |
1181 | unsigned int shift; | |
1182 | unsigned int orig_mask; | |
1183 | ||
1184 | orig_mask = data[0]; | |
1185 | if (s->n_chan <= 32) { | |
1186 | shift = CR_CHAN(insn->chanspec); | |
1187 | if (shift > 0) { | |
1188 | insn->chanspec = 0; | |
1189 | data[0] <<= shift; | |
1190 | data[1] <<= shift; | |
1191 | } | |
1192 | } else | |
1193 | shift = 0; | |
1194 | ret = s->insn_bits(dev, s, insn, data); | |
1195 | data[0] = orig_mask; | |
1196 | if (shift > 0) | |
1197 | data[1] >>= shift; | |
ed9eccbe | 1198 | } |
ed9eccbe DS |
1199 | break; |
1200 | case INSN_CONFIG: | |
1201 | ret = check_insn_config_length(insn, data); | |
1202 | if (ret) | |
1203 | break; | |
1204 | ret = s->insn_config(dev, s, insn, data); | |
1205 | break; | |
1206 | default: | |
1207 | ret = -EINVAL; | |
1208 | break; | |
1209 | } | |
1210 | ||
1211 | s->busy = NULL; | |
1212 | } | |
1213 | ||
476b8477 | 1214 | out: |
ed9eccbe DS |
1215 | return ret; |
1216 | } | |
1217 | ||
5b6cbd87 HS |
1218 | /* |
1219 | * COMEDI_INSNLIST | |
1220 | * synchronous instructions | |
1221 | * | |
1222 | * arg: | |
1223 | * pointer to sync cmd structure | |
1224 | * | |
1225 | * reads: | |
1226 | * sync cmd struct at arg | |
1227 | * instruction list | |
1228 | * data (for writes) | |
1229 | * | |
1230 | * writes: | |
1231 | * data (for reads) | |
1232 | */ | |
1233 | /* arbitrary limits */ | |
1234 | #define MAX_SAMPLES 256 | |
1235 | static int do_insnlist_ioctl(struct comedi_device *dev, | |
1236 | struct comedi_insnlist __user *arg, void *file) | |
1237 | { | |
1238 | struct comedi_insnlist insnlist; | |
1239 | struct comedi_insn *insns = NULL; | |
1240 | unsigned int *data = NULL; | |
1241 | int i = 0; | |
1242 | int ret = 0; | |
1243 | ||
1244 | if (copy_from_user(&insnlist, arg, sizeof(insnlist))) | |
1245 | return -EFAULT; | |
1246 | ||
1247 | data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL); | |
1248 | if (!data) { | |
1249 | DPRINTK("kmalloc failed\n"); | |
1250 | ret = -ENOMEM; | |
1251 | goto error; | |
1252 | } | |
1253 | ||
1254 | insns = kcalloc(insnlist.n_insns, sizeof(*insns), GFP_KERNEL); | |
1255 | if (!insns) { | |
1256 | DPRINTK("kmalloc failed\n"); | |
1257 | ret = -ENOMEM; | |
1258 | goto error; | |
1259 | } | |
1260 | ||
1261 | if (copy_from_user(insns, insnlist.insns, | |
1262 | sizeof(*insns) * insnlist.n_insns)) { | |
1263 | DPRINTK("copy_from_user failed\n"); | |
1264 | ret = -EFAULT; | |
1265 | goto error; | |
1266 | } | |
1267 | ||
1268 | for (i = 0; i < insnlist.n_insns; i++) { | |
1269 | if (insns[i].n > MAX_SAMPLES) { | |
1270 | DPRINTK("number of samples too large\n"); | |
1271 | ret = -EINVAL; | |
1272 | goto error; | |
1273 | } | |
1274 | if (insns[i].insn & INSN_MASK_WRITE) { | |
1275 | if (copy_from_user(data, insns[i].data, | |
1276 | insns[i].n * sizeof(unsigned int))) { | |
1277 | DPRINTK("copy_from_user failed\n"); | |
1278 | ret = -EFAULT; | |
1279 | goto error; | |
1280 | } | |
1281 | } | |
1282 | ret = parse_insn(dev, insns + i, data, file); | |
1283 | if (ret < 0) | |
1284 | goto error; | |
1285 | if (insns[i].insn & INSN_MASK_READ) { | |
1286 | if (copy_to_user(insns[i].data, data, | |
1287 | insns[i].n * sizeof(unsigned int))) { | |
1288 | DPRINTK("copy_to_user failed\n"); | |
1289 | ret = -EFAULT; | |
1290 | goto error; | |
1291 | } | |
1292 | } | |
1293 | if (need_resched()) | |
1294 | schedule(); | |
1295 | } | |
1296 | ||
1297 | error: | |
1298 | kfree(insns); | |
1299 | kfree(data); | |
1300 | ||
1301 | if (ret < 0) | |
1302 | return ret; | |
1303 | return i; | |
1304 | } | |
1305 | ||
ed9eccbe | 1306 | /* |
20617f22 PDP |
1307 | * COMEDI_INSN |
1308 | * synchronous instructions | |
ed9eccbe | 1309 | * |
20617f22 PDP |
1310 | * arg: |
1311 | * pointer to insn | |
ed9eccbe | 1312 | * |
20617f22 PDP |
1313 | * reads: |
1314 | * struct comedi_insn struct at arg | |
1315 | * data (for writes) | |
ed9eccbe | 1316 | * |
20617f22 PDP |
1317 | * writes: |
1318 | * data (for reads) | |
ed9eccbe | 1319 | */ |
92d0127c GKH |
1320 | static int do_insn_ioctl(struct comedi_device *dev, |
1321 | struct comedi_insn __user *arg, void *file) | |
ed9eccbe | 1322 | { |
90035c08 | 1323 | struct comedi_insn insn; |
790c5541 | 1324 | unsigned int *data = NULL; |
ed9eccbe DS |
1325 | int ret = 0; |
1326 | ||
790c5541 | 1327 | data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL); |
ed9eccbe DS |
1328 | if (!data) { |
1329 | ret = -ENOMEM; | |
1330 | goto error; | |
1331 | } | |
1332 | ||
bc252fd1 | 1333 | if (copy_from_user(&insn, arg, sizeof(insn))) { |
ed9eccbe DS |
1334 | ret = -EFAULT; |
1335 | goto error; | |
1336 | } | |
1337 | ||
1338 | /* This is where the behavior of insn and insnlist deviate. */ | |
1339 | if (insn.n > MAX_SAMPLES) | |
1340 | insn.n = MAX_SAMPLES; | |
1341 | if (insn.insn & INSN_MASK_WRITE) { | |
21fe2eea M |
1342 | if (copy_from_user(data, |
1343 | insn.data, | |
1344 | insn.n * sizeof(unsigned int))) { | |
ed9eccbe DS |
1345 | ret = -EFAULT; |
1346 | goto error; | |
1347 | } | |
1348 | } | |
1349 | ret = parse_insn(dev, &insn, data, file); | |
1350 | if (ret < 0) | |
1351 | goto error; | |
1352 | if (insn.insn & INSN_MASK_READ) { | |
21fe2eea M |
1353 | if (copy_to_user(insn.data, |
1354 | data, | |
1355 | insn.n * sizeof(unsigned int))) { | |
ed9eccbe DS |
1356 | ret = -EFAULT; |
1357 | goto error; | |
1358 | } | |
1359 | } | |
1360 | ret = insn.n; | |
1361 | ||
476b8477 GKH |
1362 | error: |
1363 | kfree(data); | |
ed9eccbe DS |
1364 | |
1365 | return ret; | |
1366 | } | |
1367 | ||
92d0127c | 1368 | static int do_cmd_ioctl(struct comedi_device *dev, |
cbe01f72 | 1369 | struct comedi_cmd __user *arg, void *file) |
ed9eccbe | 1370 | { |
88bc0574 | 1371 | struct comedi_cmd cmd; |
34c43922 | 1372 | struct comedi_subdevice *s; |
d163679c | 1373 | struct comedi_async *async; |
ed9eccbe | 1374 | int ret = 0; |
95bc359f | 1375 | unsigned int __user *user_chanlist; |
ed9eccbe | 1376 | |
bc252fd1 | 1377 | if (copy_from_user(&cmd, arg, sizeof(cmd))) { |
ed9eccbe DS |
1378 | DPRINTK("bad cmd address\n"); |
1379 | return -EFAULT; | |
1380 | } | |
476b8477 | 1381 | /* save user's chanlist pointer so it can be restored later */ |
95bc359f | 1382 | user_chanlist = (unsigned int __user *)cmd.chanlist; |
ed9eccbe | 1383 | |
88bc0574 HS |
1384 | if (cmd.subdev >= dev->n_subdevices) { |
1385 | DPRINTK("%d no such subdevice\n", cmd.subdev); | |
ed9eccbe DS |
1386 | return -ENODEV; |
1387 | } | |
1388 | ||
88bc0574 | 1389 | s = &dev->subdevices[cmd.subdev]; |
ed9eccbe DS |
1390 | async = s->async; |
1391 | ||
1392 | if (s->type == COMEDI_SUBD_UNUSED) { | |
88bc0574 | 1393 | DPRINTK("%d not valid subdevice\n", cmd.subdev); |
ed9eccbe DS |
1394 | return -EIO; |
1395 | } | |
1396 | ||
1397 | if (!s->do_cmd || !s->do_cmdtest || !s->async) { | |
1398 | DPRINTK("subdevice %i does not support commands\n", | |
88bc0574 | 1399 | cmd.subdev); |
ed9eccbe DS |
1400 | return -EIO; |
1401 | } | |
1402 | ||
1403 | /* are we locked? (ioctl lock) */ | |
1404 | if (s->lock && s->lock != file) { | |
1405 | DPRINTK("subdevice locked\n"); | |
1406 | return -EACCES; | |
1407 | } | |
1408 | ||
1409 | /* are we busy? */ | |
1410 | if (s->busy) { | |
1411 | DPRINTK("subdevice busy\n"); | |
1412 | return -EBUSY; | |
1413 | } | |
1414 | s->busy = file; | |
1415 | ||
1416 | /* make sure channel/gain list isn't too long */ | |
88bc0574 | 1417 | if (cmd.chanlist_len > s->len_chanlist) { |
ed9eccbe | 1418 | DPRINTK("channel/gain list too long %u > %d\n", |
88bc0574 | 1419 | cmd.chanlist_len, s->len_chanlist); |
ed9eccbe DS |
1420 | ret = -EINVAL; |
1421 | goto cleanup; | |
1422 | } | |
1423 | ||
1424 | /* make sure channel/gain list isn't too short */ | |
88bc0574 | 1425 | if (cmd.chanlist_len < 1) { |
ed9eccbe | 1426 | DPRINTK("channel/gain list too short %u < 1\n", |
88bc0574 | 1427 | cmd.chanlist_len); |
ed9eccbe DS |
1428 | ret = -EINVAL; |
1429 | goto cleanup; | |
1430 | } | |
1431 | ||
88bc0574 | 1432 | async->cmd = cmd; |
ed9eccbe DS |
1433 | async->cmd.data = NULL; |
1434 | /* load channel/gain list */ | |
1435 | async->cmd.chanlist = | |
476b8477 | 1436 | kmalloc(async->cmd.chanlist_len * sizeof(int), GFP_KERNEL); |
ed9eccbe DS |
1437 | if (!async->cmd.chanlist) { |
1438 | DPRINTK("allocation failed\n"); | |
1439 | ret = -ENOMEM; | |
1440 | goto cleanup; | |
1441 | } | |
1442 | ||
95bc359f | 1443 | if (copy_from_user(async->cmd.chanlist, user_chanlist, |
476b8477 | 1444 | async->cmd.chanlist_len * sizeof(int))) { |
ed9eccbe DS |
1445 | DPRINTK("fault reading chanlist\n"); |
1446 | ret = -EFAULT; | |
1447 | goto cleanup; | |
1448 | } | |
1449 | ||
1450 | /* make sure each element in channel/gain list is valid */ | |
21fe2eea M |
1451 | ret = comedi_check_chanlist(s, |
1452 | async->cmd.chanlist_len, | |
1453 | async->cmd.chanlist); | |
476b8477 | 1454 | if (ret < 0) { |
ed9eccbe DS |
1455 | DPRINTK("bad chanlist\n"); |
1456 | goto cleanup; | |
1457 | } | |
1458 | ||
1459 | ret = s->do_cmdtest(dev, s, &async->cmd); | |
1460 | ||
1461 | if (async->cmd.flags & TRIG_BOGUS || ret) { | |
1462 | DPRINTK("test returned %d\n", ret); | |
88bc0574 | 1463 | cmd = async->cmd; |
476b8477 | 1464 | /* restore chanlist pointer before copying back */ |
95bc359f | 1465 | cmd.chanlist = (unsigned int __force *)user_chanlist; |
88bc0574 | 1466 | cmd.data = NULL; |
bc252fd1 | 1467 | if (copy_to_user(arg, &cmd, sizeof(cmd))) { |
ed9eccbe DS |
1468 | DPRINTK("fault writing cmd\n"); |
1469 | ret = -EFAULT; | |
1470 | goto cleanup; | |
1471 | } | |
1472 | ret = -EAGAIN; | |
1473 | goto cleanup; | |
1474 | } | |
1475 | ||
1476 | if (!async->prealloc_bufsz) { | |
1477 | ret = -ENOMEM; | |
1478 | DPRINTK("no buffer (?)\n"); | |
1479 | goto cleanup; | |
1480 | } | |
1481 | ||
61c9fb0e | 1482 | comedi_buf_reset(async); |
ed9eccbe DS |
1483 | |
1484 | async->cb_mask = | |
476b8477 GKH |
1485 | COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR | |
1486 | COMEDI_CB_OVERFLOW; | |
1487 | if (async->cmd.flags & TRIG_WAKE_EOS) | |
ed9eccbe | 1488 | async->cb_mask |= COMEDI_CB_EOS; |
ed9eccbe DS |
1489 | |
1490 | comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING); | |
1491 | ||
ed9eccbe DS |
1492 | ret = s->do_cmd(dev, s); |
1493 | if (ret == 0) | |
1494 | return 0; | |
1495 | ||
476b8477 | 1496 | cleanup: |
ed9eccbe DS |
1497 | do_become_nonbusy(dev, s); |
1498 | ||
1499 | return ret; | |
1500 | } | |
1501 | ||
1502 | /* | |
1503 | COMEDI_CMDTEST | |
1504 | command testing ioctl | |
1505 | ||
1506 | arg: | |
1507 | pointer to cmd structure | |
1508 | ||
1509 | reads: | |
1510 | cmd structure at arg | |
1511 | channel/range list | |
1512 | ||
1513 | writes: | |
1514 | modified cmd structure at arg | |
1515 | ||
1516 | */ | |
92d0127c GKH |
1517 | static int do_cmdtest_ioctl(struct comedi_device *dev, |
1518 | struct comedi_cmd __user *arg, void *file) | |
ed9eccbe | 1519 | { |
f8348677 | 1520 | struct comedi_cmd cmd; |
34c43922 | 1521 | struct comedi_subdevice *s; |
ed9eccbe DS |
1522 | int ret = 0; |
1523 | unsigned int *chanlist = NULL; | |
95bc359f | 1524 | unsigned int __user *user_chanlist; |
ed9eccbe | 1525 | |
bc252fd1 | 1526 | if (copy_from_user(&cmd, arg, sizeof(cmd))) { |
ed9eccbe DS |
1527 | DPRINTK("bad cmd address\n"); |
1528 | return -EFAULT; | |
1529 | } | |
476b8477 | 1530 | /* save user's chanlist pointer so it can be restored later */ |
95bc359f | 1531 | user_chanlist = (unsigned int __user *)cmd.chanlist; |
ed9eccbe | 1532 | |
f8348677 HS |
1533 | if (cmd.subdev >= dev->n_subdevices) { |
1534 | DPRINTK("%d no such subdevice\n", cmd.subdev); | |
ed9eccbe DS |
1535 | return -ENODEV; |
1536 | } | |
1537 | ||
f8348677 | 1538 | s = &dev->subdevices[cmd.subdev]; |
ed9eccbe | 1539 | if (s->type == COMEDI_SUBD_UNUSED) { |
f8348677 | 1540 | DPRINTK("%d not valid subdevice\n", cmd.subdev); |
ed9eccbe DS |
1541 | return -EIO; |
1542 | } | |
1543 | ||
1544 | if (!s->do_cmd || !s->do_cmdtest) { | |
1545 | DPRINTK("subdevice %i does not support commands\n", | |
f8348677 | 1546 | cmd.subdev); |
ed9eccbe DS |
1547 | return -EIO; |
1548 | } | |
1549 | ||
1550 | /* make sure channel/gain list isn't too long */ | |
f8348677 | 1551 | if (cmd.chanlist_len > s->len_chanlist) { |
ed9eccbe | 1552 | DPRINTK("channel/gain list too long %d > %d\n", |
f8348677 | 1553 | cmd.chanlist_len, s->len_chanlist); |
ed9eccbe DS |
1554 | ret = -EINVAL; |
1555 | goto cleanup; | |
1556 | } | |
1557 | ||
1558 | /* load channel/gain list */ | |
f8348677 | 1559 | if (cmd.chanlist) { |
ed9eccbe | 1560 | chanlist = |
f8348677 | 1561 | kmalloc(cmd.chanlist_len * sizeof(int), GFP_KERNEL); |
ed9eccbe DS |
1562 | if (!chanlist) { |
1563 | DPRINTK("allocation failed\n"); | |
1564 | ret = -ENOMEM; | |
1565 | goto cleanup; | |
1566 | } | |
1567 | ||
95bc359f | 1568 | if (copy_from_user(chanlist, user_chanlist, |
f8348677 | 1569 | cmd.chanlist_len * sizeof(int))) { |
ed9eccbe DS |
1570 | DPRINTK("fault reading chanlist\n"); |
1571 | ret = -EFAULT; | |
1572 | goto cleanup; | |
1573 | } | |
1574 | ||
1575 | /* make sure each element in channel/gain list is valid */ | |
f8348677 | 1576 | ret = comedi_check_chanlist(s, cmd.chanlist_len, chanlist); |
476b8477 | 1577 | if (ret < 0) { |
ed9eccbe DS |
1578 | DPRINTK("bad chanlist\n"); |
1579 | goto cleanup; | |
1580 | } | |
1581 | ||
f8348677 | 1582 | cmd.chanlist = chanlist; |
ed9eccbe DS |
1583 | } |
1584 | ||
f8348677 | 1585 | ret = s->do_cmdtest(dev, s, &cmd); |
ed9eccbe | 1586 | |
476b8477 | 1587 | /* restore chanlist pointer before copying back */ |
95bc359f | 1588 | cmd.chanlist = (unsigned int __force *)user_chanlist; |
ed9eccbe | 1589 | |
bc252fd1 | 1590 | if (copy_to_user(arg, &cmd, sizeof(cmd))) { |
ed9eccbe DS |
1591 | DPRINTK("bad cmd address\n"); |
1592 | ret = -EFAULT; | |
1593 | goto cleanup; | |
1594 | } | |
476b8477 GKH |
1595 | cleanup: |
1596 | kfree(chanlist); | |
ed9eccbe DS |
1597 | |
1598 | return ret; | |
1599 | } | |
1600 | ||
1601 | /* | |
1602 | COMEDI_LOCK | |
1603 | lock subdevice | |
1604 | ||
1605 | arg: | |
1606 | subdevice number | |
1607 | ||
1608 | reads: | |
1609 | none | |
1610 | ||
1611 | writes: | |
1612 | none | |
1613 | ||
1614 | */ | |
1615 | ||
0a85b6f0 MT |
1616 | static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg, |
1617 | void *file) | |
ed9eccbe DS |
1618 | { |
1619 | int ret = 0; | |
1620 | unsigned long flags; | |
34c43922 | 1621 | struct comedi_subdevice *s; |
ed9eccbe DS |
1622 | |
1623 | if (arg >= dev->n_subdevices) | |
1624 | return -EINVAL; | |
b077f2cd | 1625 | s = &dev->subdevices[arg]; |
ed9eccbe | 1626 | |
5f74ea14 | 1627 | spin_lock_irqsave(&s->spin_lock, flags); |
476b8477 | 1628 | if (s->busy || s->lock) |
ed9eccbe | 1629 | ret = -EBUSY; |
476b8477 | 1630 | else |
ed9eccbe | 1631 | s->lock = file; |
5f74ea14 | 1632 | spin_unlock_irqrestore(&s->spin_lock, flags); |
ed9eccbe | 1633 | |
c5274ab0 | 1634 | #if 0 |
ed9eccbe DS |
1635 | if (ret < 0) |
1636 | return ret; | |
1637 | ||
ed9eccbe DS |
1638 | if (s->lock_f) |
1639 | ret = s->lock_f(dev, s); | |
1640 | #endif | |
1641 | ||
1642 | return ret; | |
1643 | } | |
1644 | ||
1645 | /* | |
1646 | COMEDI_UNLOCK | |
1647 | unlock subdevice | |
1648 | ||
1649 | arg: | |
1650 | subdevice number | |
1651 | ||
1652 | reads: | |
1653 | none | |
1654 | ||
1655 | writes: | |
1656 | none | |
1657 | ||
1658 | This function isn't protected by the semaphore, since | |
1659 | we already own the lock. | |
1660 | */ | |
0a85b6f0 MT |
1661 | static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg, |
1662 | void *file) | |
ed9eccbe | 1663 | { |
34c43922 | 1664 | struct comedi_subdevice *s; |
ed9eccbe DS |
1665 | |
1666 | if (arg >= dev->n_subdevices) | |
1667 | return -EINVAL; | |
b077f2cd | 1668 | s = &dev->subdevices[arg]; |
ed9eccbe DS |
1669 | |
1670 | if (s->busy) | |
1671 | return -EBUSY; | |
1672 | ||
1673 | if (s->lock && s->lock != file) | |
1674 | return -EACCES; | |
1675 | ||
1676 | if (s->lock == file) { | |
1677 | #if 0 | |
1678 | if (s->unlock) | |
1679 | s->unlock(dev, s); | |
1680 | #endif | |
1681 | ||
1682 | s->lock = NULL; | |
1683 | } | |
1684 | ||
1685 | return 0; | |
1686 | } | |
1687 | ||
1688 | /* | |
1689 | COMEDI_CANCEL | |
1690 | cancel acquisition ioctl | |
1691 | ||
1692 | arg: | |
1693 | subdevice number | |
1694 | ||
1695 | reads: | |
1696 | nothing | |
1697 | ||
1698 | writes: | |
1699 | nothing | |
1700 | ||
1701 | */ | |
0a85b6f0 MT |
1702 | static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg, |
1703 | void *file) | |
ed9eccbe | 1704 | { |
34c43922 | 1705 | struct comedi_subdevice *s; |
ed9eccbe DS |
1706 | |
1707 | if (arg >= dev->n_subdevices) | |
1708 | return -EINVAL; | |
b077f2cd | 1709 | s = &dev->subdevices[arg]; |
ed9eccbe DS |
1710 | if (s->async == NULL) |
1711 | return -EINVAL; | |
1712 | ||
1713 | if (s->lock && s->lock != file) | |
1714 | return -EACCES; | |
1715 | ||
1716 | if (!s->busy) | |
1717 | return 0; | |
1718 | ||
1719 | if (s->busy != file) | |
1720 | return -EBUSY; | |
1721 | ||
1722 | return do_cancel(dev, s); | |
1723 | } | |
1724 | ||
1725 | /* | |
1726 | COMEDI_POLL ioctl | |
1727 | instructs driver to synchronize buffers | |
1728 | ||
1729 | arg: | |
1730 | subdevice number | |
1731 | ||
1732 | reads: | |
1733 | nothing | |
1734 | ||
1735 | writes: | |
1736 | nothing | |
1737 | ||
1738 | */ | |
0a85b6f0 MT |
1739 | static int do_poll_ioctl(struct comedi_device *dev, unsigned int arg, |
1740 | void *file) | |
ed9eccbe | 1741 | { |
34c43922 | 1742 | struct comedi_subdevice *s; |
ed9eccbe DS |
1743 | |
1744 | if (arg >= dev->n_subdevices) | |
1745 | return -EINVAL; | |
b077f2cd | 1746 | s = &dev->subdevices[arg]; |
ed9eccbe DS |
1747 | |
1748 | if (s->lock && s->lock != file) | |
1749 | return -EACCES; | |
1750 | ||
1751 | if (!s->busy) | |
1752 | return 0; | |
1753 | ||
1754 | if (s->busy != file) | |
1755 | return -EBUSY; | |
1756 | ||
1757 | if (s->poll) | |
1758 | return s->poll(dev, s); | |
1759 | ||
1760 | return -EINVAL; | |
1761 | } | |
1762 | ||
47db6d58 HS |
1763 | static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd, |
1764 | unsigned long arg) | |
1765 | { | |
6131ffaa | 1766 | const unsigned minor = iminor(file_inode(file)); |
5e04c254 | 1767 | struct comedi_device *dev = comedi_dev_from_minor(minor); |
47db6d58 HS |
1768 | int rc; |
1769 | ||
4da5fa9a | 1770 | if (!dev) |
47db6d58 | 1771 | return -ENODEV; |
47db6d58 HS |
1772 | |
1773 | mutex_lock(&dev->mutex); | |
1774 | ||
1775 | /* Device config is special, because it must work on | |
1776 | * an unconfigured device. */ | |
1777 | if (cmd == COMEDI_DEVCONFIG) { | |
754ab5c0 IA |
1778 | if (minor >= COMEDI_NUM_BOARD_MINORS) { |
1779 | /* Device config not appropriate on non-board minors. */ | |
1780 | rc = -ENOTTY; | |
1781 | goto done; | |
1782 | } | |
47db6d58 HS |
1783 | rc = do_devconfig_ioctl(dev, |
1784 | (struct comedi_devconfig __user *)arg); | |
8ab4ed6e IA |
1785 | if (rc == 0) { |
1786 | if (arg == 0 && | |
1787 | dev->minor >= comedi_num_legacy_minors) { | |
1788 | /* Successfully unconfigured a dynamically | |
1789 | * allocated device. Try and remove it. */ | |
db210da2 | 1790 | if (comedi_clear_board_dev(dev)) { |
8ab4ed6e | 1791 | mutex_unlock(&dev->mutex); |
cb6b79de | 1792 | comedi_free_board_dev(dev); |
8ab4ed6e IA |
1793 | return rc; |
1794 | } | |
1795 | } | |
1796 | } | |
47db6d58 HS |
1797 | goto done; |
1798 | } | |
1799 | ||
1800 | if (!dev->attached) { | |
1801 | DPRINTK("no driver configured on /dev/comedi%i\n", dev->minor); | |
1802 | rc = -ENODEV; | |
1803 | goto done; | |
1804 | } | |
1805 | ||
1806 | switch (cmd) { | |
1807 | case COMEDI_BUFCONFIG: | |
1808 | rc = do_bufconfig_ioctl(dev, | |
1809 | (struct comedi_bufconfig __user *)arg); | |
1810 | break; | |
1811 | case COMEDI_DEVINFO: | |
1812 | rc = do_devinfo_ioctl(dev, (struct comedi_devinfo __user *)arg, | |
1813 | file); | |
1814 | break; | |
1815 | case COMEDI_SUBDINFO: | |
1816 | rc = do_subdinfo_ioctl(dev, | |
1817 | (struct comedi_subdinfo __user *)arg, | |
1818 | file); | |
1819 | break; | |
1820 | case COMEDI_CHANINFO: | |
1821 | rc = do_chaninfo_ioctl(dev, (void __user *)arg); | |
1822 | break; | |
1823 | case COMEDI_RANGEINFO: | |
1824 | rc = do_rangeinfo_ioctl(dev, (void __user *)arg); | |
1825 | break; | |
1826 | case COMEDI_BUFINFO: | |
1827 | rc = do_bufinfo_ioctl(dev, | |
1828 | (struct comedi_bufinfo __user *)arg, | |
1829 | file); | |
1830 | break; | |
1831 | case COMEDI_LOCK: | |
1832 | rc = do_lock_ioctl(dev, arg, file); | |
1833 | break; | |
1834 | case COMEDI_UNLOCK: | |
1835 | rc = do_unlock_ioctl(dev, arg, file); | |
1836 | break; | |
1837 | case COMEDI_CANCEL: | |
1838 | rc = do_cancel_ioctl(dev, arg, file); | |
1839 | break; | |
1840 | case COMEDI_CMD: | |
1841 | rc = do_cmd_ioctl(dev, (struct comedi_cmd __user *)arg, file); | |
1842 | break; | |
1843 | case COMEDI_CMDTEST: | |
1844 | rc = do_cmdtest_ioctl(dev, (struct comedi_cmd __user *)arg, | |
1845 | file); | |
1846 | break; | |
1847 | case COMEDI_INSNLIST: | |
1848 | rc = do_insnlist_ioctl(dev, | |
1849 | (struct comedi_insnlist __user *)arg, | |
1850 | file); | |
1851 | break; | |
1852 | case COMEDI_INSN: | |
1853 | rc = do_insn_ioctl(dev, (struct comedi_insn __user *)arg, | |
1854 | file); | |
1855 | break; | |
1856 | case COMEDI_POLL: | |
1857 | rc = do_poll_ioctl(dev, arg, file); | |
1858 | break; | |
1859 | default: | |
1860 | rc = -ENOTTY; | |
1861 | break; | |
1862 | } | |
1863 | ||
1864 | done: | |
1865 | mutex_unlock(&dev->mutex); | |
1866 | return rc; | |
1867 | } | |
1868 | ||
df30b21c FV |
1869 | static void comedi_vm_open(struct vm_area_struct *area) |
1870 | { | |
1871 | struct comedi_async *async; | |
1872 | struct comedi_device *dev; | |
1873 | ||
1874 | async = area->vm_private_data; | |
1875 | dev = async->subdevice->device; | |
1876 | ||
1877 | mutex_lock(&dev->mutex); | |
1878 | async->mmap_count++; | |
1879 | mutex_unlock(&dev->mutex); | |
1880 | } | |
1881 | ||
1882 | static void comedi_vm_close(struct vm_area_struct *area) | |
ed9eccbe | 1883 | { |
d163679c | 1884 | struct comedi_async *async; |
71b5f4f1 | 1885 | struct comedi_device *dev; |
ed9eccbe DS |
1886 | |
1887 | async = area->vm_private_data; | |
1888 | dev = async->subdevice->device; | |
1889 | ||
1890 | mutex_lock(&dev->mutex); | |
1891 | async->mmap_count--; | |
1892 | mutex_unlock(&dev->mutex); | |
1893 | } | |
1894 | ||
1895 | static struct vm_operations_struct comedi_vm_ops = { | |
df30b21c FV |
1896 | .open = comedi_vm_open, |
1897 | .close = comedi_vm_close, | |
ed9eccbe DS |
1898 | }; |
1899 | ||
1900 | static int comedi_mmap(struct file *file, struct vm_area_struct *vma) | |
1901 | { | |
6131ffaa | 1902 | const unsigned minor = iminor(file_inode(file)); |
5e04c254 | 1903 | struct comedi_device *dev = comedi_dev_from_minor(minor); |
a52840a9 HS |
1904 | struct comedi_subdevice *s; |
1905 | struct comedi_async *async; | |
ed9eccbe DS |
1906 | unsigned long start = vma->vm_start; |
1907 | unsigned long size; | |
1908 | int n_pages; | |
1909 | int i; | |
1910 | int retval; | |
3ffab428 | 1911 | |
a52840a9 | 1912 | if (!dev) |
70fe742c | 1913 | return -ENODEV; |
ed9eccbe DS |
1914 | |
1915 | mutex_lock(&dev->mutex); | |
a52840a9 | 1916 | |
ed9eccbe DS |
1917 | if (!dev->attached) { |
1918 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
1919 | retval = -ENODEV; | |
1920 | goto done; | |
1921 | } | |
a52840a9 | 1922 | |
476b8477 | 1923 | if (vma->vm_flags & VM_WRITE) |
da56fdc6 | 1924 | s = comedi_write_subdevice(dev, minor); |
476b8477 | 1925 | else |
da56fdc6 | 1926 | s = comedi_read_subdevice(dev, minor); |
a52840a9 | 1927 | if (!s) { |
ed9eccbe DS |
1928 | retval = -EINVAL; |
1929 | goto done; | |
1930 | } | |
a52840a9 | 1931 | |
ed9eccbe | 1932 | async = s->async; |
a52840a9 | 1933 | if (!async) { |
ed9eccbe DS |
1934 | retval = -EINVAL; |
1935 | goto done; | |
1936 | } | |
1937 | ||
1938 | if (vma->vm_pgoff != 0) { | |
1939 | DPRINTK("comedi: mmap() offset must be 0.\n"); | |
1940 | retval = -EINVAL; | |
1941 | goto done; | |
1942 | } | |
1943 | ||
1944 | size = vma->vm_end - vma->vm_start; | |
1945 | if (size > async->prealloc_bufsz) { | |
1946 | retval = -EFAULT; | |
1947 | goto done; | |
1948 | } | |
1949 | if (size & (~PAGE_MASK)) { | |
1950 | retval = -EFAULT; | |
1951 | goto done; | |
1952 | } | |
1953 | ||
1954 | n_pages = size >> PAGE_SHIFT; | |
1955 | for (i = 0; i < n_pages; ++i) { | |
a52840a9 HS |
1956 | struct comedi_buf_page *buf = &async->buf_page_list[i]; |
1957 | ||
ed9eccbe | 1958 | if (remap_pfn_range(vma, start, |
a52840a9 HS |
1959 | page_to_pfn(virt_to_page(buf->virt_addr)), |
1960 | PAGE_SIZE, PAGE_SHARED)) { | |
ed9eccbe DS |
1961 | retval = -EAGAIN; |
1962 | goto done; | |
1963 | } | |
1964 | start += PAGE_SIZE; | |
1965 | } | |
1966 | ||
1967 | vma->vm_ops = &comedi_vm_ops; | |
1968 | vma->vm_private_data = async; | |
1969 | ||
1970 | async->mmap_count++; | |
1971 | ||
1972 | retval = 0; | |
476b8477 | 1973 | done: |
ed9eccbe DS |
1974 | mutex_unlock(&dev->mutex); |
1975 | return retval; | |
1976 | } | |
1977 | ||
1ae5062a | 1978 | static unsigned int comedi_poll(struct file *file, poll_table *wait) |
ed9eccbe DS |
1979 | { |
1980 | unsigned int mask = 0; | |
6131ffaa | 1981 | const unsigned minor = iminor(file_inode(file)); |
5e04c254 | 1982 | struct comedi_device *dev = comedi_dev_from_minor(minor); |
ca081b1d | 1983 | struct comedi_subdevice *s; |
3ffab428 | 1984 | |
ca081b1d | 1985 | if (!dev) |
70fe742c | 1986 | return -ENODEV; |
ed9eccbe DS |
1987 | |
1988 | mutex_lock(&dev->mutex); | |
ca081b1d | 1989 | |
ed9eccbe DS |
1990 | if (!dev->attached) { |
1991 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
ca081b1d | 1992 | goto done; |
ed9eccbe DS |
1993 | } |
1994 | ||
da56fdc6 | 1995 | s = comedi_read_subdevice(dev, minor); |
cc400e18 | 1996 | if (s && s->async) { |
ca081b1d | 1997 | poll_wait(file, &s->async->wait_head, wait); |
f0124630 | 1998 | if (!s->busy || !comedi_is_subdevice_running(s) || |
ca081b1d | 1999 | comedi_buf_read_n_available(s->async) > 0) |
ed9eccbe | 2000 | mask |= POLLIN | POLLRDNORM; |
ed9eccbe | 2001 | } |
ca081b1d | 2002 | |
da56fdc6 | 2003 | s = comedi_write_subdevice(dev, minor); |
cc400e18 | 2004 | if (s && s->async) { |
ca081b1d HS |
2005 | unsigned int bps = bytes_per_sample(s->async->subdevice); |
2006 | ||
2007 | poll_wait(file, &s->async->wait_head, wait); | |
2008 | comedi_buf_write_alloc(s->async, s->async->prealloc_bufsz); | |
f0124630 | 2009 | if (!s->busy || !comedi_is_subdevice_running(s) || |
ca081b1d | 2010 | comedi_buf_write_n_allocated(s->async) >= bps) |
ed9eccbe | 2011 | mask |= POLLOUT | POLLWRNORM; |
ed9eccbe DS |
2012 | } |
2013 | ||
ca081b1d | 2014 | done: |
ed9eccbe DS |
2015 | mutex_unlock(&dev->mutex); |
2016 | return mask; | |
2017 | } | |
2018 | ||
92d0127c GKH |
2019 | static ssize_t comedi_write(struct file *file, const char __user *buf, |
2020 | size_t nbytes, loff_t *offset) | |
ed9eccbe | 2021 | { |
34c43922 | 2022 | struct comedi_subdevice *s; |
d163679c | 2023 | struct comedi_async *async; |
ed9eccbe DS |
2024 | int n, m, count = 0, retval = 0; |
2025 | DECLARE_WAITQUEUE(wait, current); | |
6131ffaa | 2026 | const unsigned minor = iminor(file_inode(file)); |
5e04c254 | 2027 | struct comedi_device *dev = comedi_dev_from_minor(minor); |
3ffab428 | 2028 | |
2714b019 | 2029 | if (!dev) |
70fe742c | 2030 | return -ENODEV; |
ed9eccbe DS |
2031 | |
2032 | if (!dev->attached) { | |
2033 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
2714b019 | 2034 | return -ENODEV; |
ed9eccbe DS |
2035 | } |
2036 | ||
da56fdc6 | 2037 | s = comedi_write_subdevice(dev, minor); |
cc400e18 | 2038 | if (!s || !s->async) |
2714b019 HS |
2039 | return -EIO; |
2040 | ||
ed9eccbe DS |
2041 | async = s->async; |
2042 | ||
2714b019 HS |
2043 | if (!s->busy || !nbytes) |
2044 | return 0; | |
2045 | if (s->busy != file) | |
2046 | return -EACCES; | |
2047 | ||
ed9eccbe DS |
2048 | add_wait_queue(&async->wait_head, &wait); |
2049 | while (nbytes > 0 && !retval) { | |
2050 | set_current_state(TASK_INTERRUPTIBLE); | |
2051 | ||
f0124630 | 2052 | if (!comedi_is_subdevice_running(s)) { |
d2611540 | 2053 | if (count == 0) { |
c098c21a | 2054 | if (comedi_is_subdevice_in_error(s)) |
d2611540 | 2055 | retval = -EPIPE; |
c098c21a | 2056 | else |
d2611540 | 2057 | retval = 0; |
d2611540 IA |
2058 | do_become_nonbusy(dev, s); |
2059 | } | |
2060 | break; | |
2061 | } | |
2062 | ||
ed9eccbe DS |
2063 | n = nbytes; |
2064 | ||
2065 | m = n; | |
476b8477 | 2066 | if (async->buf_write_ptr + m > async->prealloc_bufsz) |
ed9eccbe | 2067 | m = async->prealloc_bufsz - async->buf_write_ptr; |
ed9eccbe | 2068 | comedi_buf_write_alloc(async, async->prealloc_bufsz); |
476b8477 | 2069 | if (m > comedi_buf_write_n_allocated(async)) |
ed9eccbe | 2070 | m = comedi_buf_write_n_allocated(async); |
ed9eccbe DS |
2071 | if (m < n) |
2072 | n = m; | |
2073 | ||
2074 | if (n == 0) { | |
ed9eccbe DS |
2075 | if (file->f_flags & O_NONBLOCK) { |
2076 | retval = -EAGAIN; | |
2077 | break; | |
2078 | } | |
6a9ce6b6 | 2079 | schedule(); |
ed9eccbe DS |
2080 | if (signal_pending(current)) { |
2081 | retval = -ERESTARTSYS; | |
2082 | break; | |
2083 | } | |
476b8477 | 2084 | if (!s->busy) |
ed9eccbe | 2085 | break; |
ed9eccbe DS |
2086 | if (s->busy != file) { |
2087 | retval = -EACCES; | |
2088 | break; | |
2089 | } | |
2090 | continue; | |
2091 | } | |
2092 | ||
2093 | m = copy_from_user(async->prealloc_buf + async->buf_write_ptr, | |
476b8477 | 2094 | buf, n); |
ed9eccbe DS |
2095 | if (m) { |
2096 | n -= m; | |
2097 | retval = -EFAULT; | |
2098 | } | |
2099 | comedi_buf_write_free(async, n); | |
2100 | ||
2101 | count += n; | |
2102 | nbytes -= n; | |
2103 | ||
2104 | buf += n; | |
2105 | break; /* makes device work like a pipe */ | |
2106 | } | |
2107 | set_current_state(TASK_RUNNING); | |
2108 | remove_wait_queue(&async->wait_head, &wait); | |
2109 | ||
476b8477 | 2110 | return count ? count : retval; |
ed9eccbe DS |
2111 | } |
2112 | ||
92d0127c | 2113 | static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes, |
6705b68d | 2114 | loff_t *offset) |
ed9eccbe | 2115 | { |
34c43922 | 2116 | struct comedi_subdevice *s; |
d163679c | 2117 | struct comedi_async *async; |
ed9eccbe DS |
2118 | int n, m, count = 0, retval = 0; |
2119 | DECLARE_WAITQUEUE(wait, current); | |
6131ffaa | 2120 | const unsigned minor = iminor(file_inode(file)); |
5e04c254 | 2121 | struct comedi_device *dev = comedi_dev_from_minor(minor); |
3ffab428 | 2122 | |
5c87fef5 | 2123 | if (!dev) |
70fe742c | 2124 | return -ENODEV; |
ed9eccbe DS |
2125 | |
2126 | if (!dev->attached) { | |
2127 | DPRINTK("no driver configured on comedi%i\n", dev->minor); | |
5c87fef5 | 2128 | return -ENODEV; |
ed9eccbe DS |
2129 | } |
2130 | ||
da56fdc6 | 2131 | s = comedi_read_subdevice(dev, minor); |
cc400e18 | 2132 | if (!s || !s->async) |
5c87fef5 HS |
2133 | return -EIO; |
2134 | ||
ed9eccbe | 2135 | async = s->async; |
5c87fef5 HS |
2136 | if (!s->busy || !nbytes) |
2137 | return 0; | |
2138 | if (s->busy != file) | |
2139 | return -EACCES; | |
ed9eccbe DS |
2140 | |
2141 | add_wait_queue(&async->wait_head, &wait); | |
2142 | while (nbytes > 0 && !retval) { | |
2143 | set_current_state(TASK_INTERRUPTIBLE); | |
2144 | ||
2145 | n = nbytes; | |
2146 | ||
2147 | m = comedi_buf_read_n_available(async); | |
476b8477 GKH |
2148 | /* printk("%d available\n",m); */ |
2149 | if (async->buf_read_ptr + m > async->prealloc_bufsz) | |
ed9eccbe | 2150 | m = async->prealloc_bufsz - async->buf_read_ptr; |
476b8477 | 2151 | /* printk("%d contiguous\n",m); */ |
ed9eccbe DS |
2152 | if (m < n) |
2153 | n = m; | |
2154 | ||
2155 | if (n == 0) { | |
f0124630 | 2156 | if (!comedi_is_subdevice_running(s)) { |
ed9eccbe | 2157 | do_become_nonbusy(dev, s); |
c098c21a | 2158 | if (comedi_is_subdevice_in_error(s)) |
ed9eccbe | 2159 | retval = -EPIPE; |
c098c21a | 2160 | else |
ed9eccbe | 2161 | retval = 0; |
ed9eccbe DS |
2162 | break; |
2163 | } | |
2164 | if (file->f_flags & O_NONBLOCK) { | |
2165 | retval = -EAGAIN; | |
2166 | break; | |
2167 | } | |
6a9ce6b6 | 2168 | schedule(); |
ed9eccbe DS |
2169 | if (signal_pending(current)) { |
2170 | retval = -ERESTARTSYS; | |
2171 | break; | |
2172 | } | |
ed9eccbe DS |
2173 | if (!s->busy) { |
2174 | retval = 0; | |
2175 | break; | |
2176 | } | |
2177 | if (s->busy != file) { | |
2178 | retval = -EACCES; | |
2179 | break; | |
2180 | } | |
2181 | continue; | |
2182 | } | |
2183 | m = copy_to_user(buf, async->prealloc_buf + | |
476b8477 | 2184 | async->buf_read_ptr, n); |
ed9eccbe DS |
2185 | if (m) { |
2186 | n -= m; | |
2187 | retval = -EFAULT; | |
2188 | } | |
2189 | ||
2190 | comedi_buf_read_alloc(async, n); | |
2191 | comedi_buf_read_free(async, n); | |
2192 | ||
2193 | count += n; | |
2194 | nbytes -= n; | |
2195 | ||
2196 | buf += n; | |
2197 | break; /* makes device work like a pipe */ | |
2198 | } | |
9682e28c | 2199 | if (comedi_is_subdevice_idle(s) && |
476b8477 | 2200 | async->buf_read_count - async->buf_write_count == 0) { |
ed9eccbe DS |
2201 | do_become_nonbusy(dev, s); |
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 | ||
2560 | /* XXX requires /proc interface */ | |
2561 | comedi_proc_init(); | |
2562 | ||
2563 | /* create devices files for legacy/manual use */ | |
2564 | for (i = 0; i < comedi_num_legacy_minors; i++) { | |
7638ffcb IA |
2565 | struct comedi_device *dev; |
2566 | dev = comedi_alloc_board_minor(NULL); | |
2567 | if (IS_ERR(dev)) { | |
682b9119 | 2568 | comedi_cleanup_board_minors(); |
91fa0b0c HS |
2569 | cdev_del(&comedi_cdev); |
2570 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
2571 | COMEDI_NUM_MINORS); | |
7638ffcb | 2572 | return PTR_ERR(dev); |
07778393 IA |
2573 | } else { |
2574 | /* comedi_alloc_board_minor() locked the mutex */ | |
2575 | mutex_unlock(&dev->mutex); | |
91fa0b0c HS |
2576 | } |
2577 | } | |
2578 | ||
2579 | return 0; | |
2580 | } | |
2581 | module_init(comedi_init); | |
2582 | ||
2583 | static void __exit comedi_cleanup(void) | |
2584 | { | |
2585 | int i; | |
2586 | ||
682b9119 | 2587 | comedi_cleanup_board_minors(); |
5b7dba1b IA |
2588 | for (i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i) |
2589 | BUG_ON(comedi_board_minor_table[i]); | |
2590 | for (i = 0; i < COMEDI_NUM_SUBDEVICE_MINORS; ++i) | |
2591 | BUG_ON(comedi_subdevice_minor_table[i]); | |
91fa0b0c HS |
2592 | |
2593 | class_destroy(comedi_class); | |
2594 | cdev_del(&comedi_cdev); | |
2595 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS); | |
2596 | ||
2597 | comedi_proc_cleanup(); | |
2598 | } | |
2599 | module_exit(comedi_cleanup); | |
2600 | ||
a5787824 HS |
2601 | MODULE_AUTHOR("http://www.comedi.org"); |
2602 | MODULE_DESCRIPTION("Comedi core module"); | |
2603 | MODULE_LICENSE("GPL"); |