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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 | ||
c2ad078b HS |
19 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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> | |
ed9eccbe DS |
29 | #include <linux/mm.h> |
30 | #include <linux/slab.h> | |
31 | #include <linux/kmod.h> | |
32 | #include <linux/poll.h> | |
33 | #include <linux/init.h> | |
34 | #include <linux/device.h> | |
35 | #include <linux/vmalloc.h> | |
36 | #include <linux/fs.h> | |
37 | #include "comedidev.h" | |
38 | #include <linux/cdev.h> | |
883db3d9 | 39 | #include <linux/stat.h> |
ed9eccbe | 40 | |
476b8477 GKH |
41 | #include <linux/io.h> |
42 | #include <linux/uaccess.h> | |
ed9eccbe | 43 | |
3a5fa275 | 44 | #include "comedi_internal.h" |
ed9eccbe | 45 | |
eda56825 | 46 | #define COMEDI_NUM_MINORS 0x100 |
5b7dba1b IA |
47 | #define COMEDI_NUM_SUBDEVICE_MINORS \ |
48 | (COMEDI_NUM_MINORS - COMEDI_NUM_BOARD_MINORS) | |
eda56825 | 49 | |
92d0127c | 50 | static int comedi_num_legacy_minors; |
4d7df821 IA |
51 | module_param(comedi_num_legacy_minors, int, S_IRUGO); |
52 | MODULE_PARM_DESC(comedi_num_legacy_minors, | |
53 | "number of comedi minor devices to reserve for non-auto-configured devices (default 0)" | |
54 | ); | |
55 | ||
234bb3c6 | 56 | unsigned int comedi_default_buf_size_kb = CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB; |
4d7df821 IA |
57 | module_param(comedi_default_buf_size_kb, uint, S_IRUGO | S_IWUSR); |
58 | MODULE_PARM_DESC(comedi_default_buf_size_kb, | |
59 | "default asynchronous buffer size in KiB (default " | |
234bb3c6 | 60 | __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB) ")"); |
4d7df821 | 61 | |
234bb3c6 IA |
62 | unsigned int comedi_default_buf_maxsize_kb |
63 | = CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB; | |
4d7df821 IA |
64 | module_param(comedi_default_buf_maxsize_kb, uint, S_IRUGO | S_IWUSR); |
65 | MODULE_PARM_DESC(comedi_default_buf_maxsize_kb, | |
66 | "default maximum size of asynchronous buffer in KiB (default " | |
234bb3c6 | 67 | __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB) ")"); |
1dd33ab8 | 68 | |
5b7dba1b | 69 | static DEFINE_MUTEX(comedi_board_minor_table_lock); |
cb6b79de | 70 | static struct comedi_device |
5b7dba1b IA |
71 | *comedi_board_minor_table[COMEDI_NUM_BOARD_MINORS]; |
72 | ||
73 | static DEFINE_MUTEX(comedi_subdevice_minor_table_lock); | |
74 | /* Note: indexed by minor - COMEDI_NUM_BOARD_MINORS. */ | |
bd5b4173 | 75 | static struct comedi_subdevice |
5b7dba1b | 76 | *comedi_subdevice_minor_table[COMEDI_NUM_SUBDEVICE_MINORS]; |
476b8477 | 77 | |
d9740a03 IA |
78 | static struct class *comedi_class; |
79 | static struct cdev comedi_cdev; | |
80 | ||
81 | static void comedi_device_init(struct comedi_device *dev) | |
82 | { | |
5b13ed94 | 83 | kref_init(&dev->refcount); |
d9740a03 IA |
84 | spin_lock_init(&dev->spinlock); |
85 | mutex_init(&dev->mutex); | |
2f3fdcd7 | 86 | init_rwsem(&dev->attach_lock); |
d9740a03 IA |
87 | dev->minor = -1; |
88 | } | |
89 | ||
5b13ed94 IA |
90 | static void comedi_dev_kref_release(struct kref *kref) |
91 | { | |
92 | struct comedi_device *dev = | |
93 | container_of(kref, struct comedi_device, refcount); | |
94 | ||
95 | mutex_destroy(&dev->mutex); | |
8f988d87 | 96 | put_device(dev->class_dev); |
5b13ed94 IA |
97 | kfree(dev); |
98 | } | |
99 | ||
100 | int comedi_dev_put(struct comedi_device *dev) | |
101 | { | |
102 | if (dev) | |
103 | return kref_put(&dev->refcount, comedi_dev_kref_release); | |
104 | return 1; | |
105 | } | |
b449c1ca IA |
106 | EXPORT_SYMBOL_GPL(comedi_dev_put); |
107 | ||
108 | static struct comedi_device *comedi_dev_get(struct comedi_device *dev) | |
109 | { | |
110 | if (dev) | |
111 | kref_get(&dev->refcount); | |
112 | return dev; | |
113 | } | |
5b13ed94 | 114 | |
d9740a03 IA |
115 | static void comedi_device_cleanup(struct comedi_device *dev) |
116 | { | |
117 | struct module *driver_module = NULL; | |
118 | ||
119 | if (dev == NULL) | |
120 | return; | |
121 | mutex_lock(&dev->mutex); | |
122 | if (dev->attached) | |
123 | driver_module = dev->driver->module; | |
124 | comedi_device_detach(dev); | |
1363e4fb IA |
125 | if (driver_module && dev->use_count) |
126 | module_put(driver_module); | |
d9740a03 | 127 | mutex_unlock(&dev->mutex); |
d9740a03 IA |
128 | } |
129 | ||
db210da2 IA |
130 | static bool comedi_clear_board_dev(struct comedi_device *dev) |
131 | { | |
132 | unsigned int i = dev->minor; | |
133 | bool cleared = false; | |
134 | ||
135 | mutex_lock(&comedi_board_minor_table_lock); | |
136 | if (dev == comedi_board_minor_table[i]) { | |
137 | comedi_board_minor_table[i] = NULL; | |
138 | cleared = true; | |
139 | } | |
140 | mutex_unlock(&comedi_board_minor_table_lock); | |
141 | return cleared; | |
142 | } | |
143 | ||
cb6b79de | 144 | static struct comedi_device *comedi_clear_board_minor(unsigned minor) |
d9740a03 | 145 | { |
cb6b79de | 146 | struct comedi_device *dev; |
d9740a03 | 147 | |
5b7dba1b | 148 | mutex_lock(&comedi_board_minor_table_lock); |
cb6b79de | 149 | dev = comedi_board_minor_table[minor]; |
5b7dba1b IA |
150 | comedi_board_minor_table[minor] = NULL; |
151 | mutex_unlock(&comedi_board_minor_table_lock); | |
cb6b79de | 152 | return dev; |
d9740a03 IA |
153 | } |
154 | ||
cb6b79de | 155 | static void comedi_free_board_dev(struct comedi_device *dev) |
d9740a03 | 156 | { |
cb6b79de | 157 | if (dev) { |
52ef9e7c | 158 | comedi_device_cleanup(dev); |
cb6b79de IA |
159 | if (dev->class_dev) { |
160 | device_destroy(comedi_class, | |
161 | MKDEV(COMEDI_MAJOR, dev->minor)); | |
d9740a03 | 162 | } |
5b13ed94 | 163 | comedi_dev_put(dev); |
d9740a03 IA |
164 | } |
165 | } | |
8ab4ed6e | 166 | |
bd5b4173 | 167 | static struct comedi_subdevice |
63ab0395 | 168 | *comedi_subdevice_from_minor(const struct comedi_device *dev, unsigned minor) |
5b7dba1b | 169 | { |
bd5b4173 | 170 | struct comedi_subdevice *s; |
5b7dba1b IA |
171 | unsigned int i = minor - COMEDI_NUM_BOARD_MINORS; |
172 | ||
173 | BUG_ON(i >= COMEDI_NUM_SUBDEVICE_MINORS); | |
174 | mutex_lock(&comedi_subdevice_minor_table_lock); | |
bd5b4173 | 175 | s = comedi_subdevice_minor_table[i]; |
63ab0395 IA |
176 | if (s && s->device != dev) |
177 | s = NULL; | |
5b7dba1b | 178 | mutex_unlock(&comedi_subdevice_minor_table_lock); |
bd5b4173 | 179 | return s; |
5b7dba1b IA |
180 | } |
181 | ||
b449c1ca IA |
182 | static struct comedi_device *comedi_dev_get_from_board_minor(unsigned minor) |
183 | { | |
184 | struct comedi_device *dev; | |
185 | ||
186 | BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS); | |
187 | mutex_lock(&comedi_board_minor_table_lock); | |
188 | dev = comedi_dev_get(comedi_board_minor_table[minor]); | |
189 | mutex_unlock(&comedi_board_minor_table_lock); | |
190 | return dev; | |
191 | } | |
192 | ||
193 | static struct comedi_device *comedi_dev_get_from_subdevice_minor(unsigned minor) | |
194 | { | |
195 | struct comedi_device *dev; | |
196 | struct comedi_subdevice *s; | |
197 | unsigned int i = minor - COMEDI_NUM_BOARD_MINORS; | |
198 | ||
199 | BUG_ON(i >= COMEDI_NUM_SUBDEVICE_MINORS); | |
200 | mutex_lock(&comedi_subdevice_minor_table_lock); | |
201 | s = comedi_subdevice_minor_table[i]; | |
202 | dev = comedi_dev_get(s ? s->device : NULL); | |
203 | mutex_unlock(&comedi_subdevice_minor_table_lock); | |
204 | return dev; | |
205 | } | |
206 | ||
207 | struct comedi_device *comedi_dev_get_from_minor(unsigned minor) | |
208 | { | |
209 | if (minor < COMEDI_NUM_BOARD_MINORS) | |
210 | return comedi_dev_get_from_board_minor(minor); | |
cb3aadae KH |
211 | |
212 | return comedi_dev_get_from_subdevice_minor(minor); | |
b449c1ca IA |
213 | } |
214 | EXPORT_SYMBOL_GPL(comedi_dev_get_from_minor); | |
215 | ||
43bd33f2 | 216 | static struct comedi_subdevice * |
da56fdc6 | 217 | comedi_read_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) { | |
63ab0395 IA |
222 | s = comedi_subdevice_from_minor(dev, minor); |
223 | if (s == NULL || (s->subdev_flags & SDF_CMD_READ)) | |
bd5b4173 | 224 | return s; |
da56fdc6 IA |
225 | } |
226 | return dev->read_subdev; | |
43bd33f2 HS |
227 | } |
228 | ||
229 | static struct comedi_subdevice * | |
da56fdc6 | 230 | comedi_write_subdevice(const struct comedi_device *dev, unsigned int minor) |
43bd33f2 | 231 | { |
bd5b4173 | 232 | struct comedi_subdevice *s; |
da56fdc6 IA |
233 | |
234 | if (minor >= COMEDI_NUM_BOARD_MINORS) { | |
63ab0395 IA |
235 | s = comedi_subdevice_from_minor(dev, minor); |
236 | if (s == NULL || (s->subdev_flags & SDF_CMD_WRITE)) | |
bd5b4173 | 237 | return s; |
da56fdc6 IA |
238 | } |
239 | return dev->write_subdev; | |
43bd33f2 HS |
240 | } |
241 | ||
883db3d9 | 242 | static int resize_async_buffer(struct comedi_device *dev, |
482f0a21 | 243 | struct comedi_subdevice *s, unsigned new_size) |
a5011a26 | 244 | { |
482f0a21 | 245 | struct comedi_async *async = s->async; |
a5011a26 HS |
246 | int retval; |
247 | ||
248 | if (new_size > async->max_bufsize) | |
249 | return -EPERM; | |
250 | ||
251 | if (s->busy) { | |
272850f0 HS |
252 | dev_dbg(dev->class_dev, |
253 | "subdevice is busy, cannot resize buffer\n"); | |
a5011a26 HS |
254 | return -EBUSY; |
255 | } | |
d4526ab4 | 256 | if (comedi_buf_is_mmapped(s)) { |
272850f0 HS |
257 | dev_dbg(dev->class_dev, |
258 | "subdevice is mmapped, cannot resize buffer\n"); | |
a5011a26 HS |
259 | return -EBUSY; |
260 | } | |
261 | ||
a5011a26 HS |
262 | /* make sure buffer is an integral number of pages |
263 | * (we round up) */ | |
264 | new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK; | |
265 | ||
266 | retval = comedi_buf_alloc(dev, s, new_size); | |
267 | if (retval < 0) | |
268 | return retval; | |
269 | ||
270 | if (s->buf_change) { | |
d546b896 | 271 | retval = s->buf_change(dev, s); |
a5011a26 HS |
272 | if (retval < 0) |
273 | return retval; | |
274 | } | |
275 | ||
272850f0 HS |
276 | dev_dbg(dev->class_dev, "subd %d buffer resized to %i bytes\n", |
277 | s->index, async->prealloc_bufsz); | |
a5011a26 HS |
278 | return 0; |
279 | } | |
280 | ||
281 | /* sysfs attribute files */ | |
282 | ||
e56341ad | 283 | static ssize_t max_read_buffer_kb_show(struct device *csdev, |
a5011a26 HS |
284 | struct device_attribute *attr, char *buf) |
285 | { | |
c88db469 | 286 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
287 | struct comedi_device *dev; |
288 | struct comedi_subdevice *s; | |
72fd9fac | 289 | unsigned int size = 0; |
a5011a26 | 290 | |
be535c9a | 291 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 292 | if (!dev) |
c88db469 IA |
293 | return -ENODEV; |
294 | ||
7f4656c5 | 295 | mutex_lock(&dev->mutex); |
da56fdc6 | 296 | s = comedi_read_subdevice(dev, minor); |
72fd9fac HS |
297 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
298 | size = s->async->max_bufsize / 1024; | |
7f4656c5 | 299 | mutex_unlock(&dev->mutex); |
a5011a26 | 300 | |
be535c9a | 301 | comedi_dev_put(dev); |
ecd56ff9 | 302 | return snprintf(buf, PAGE_SIZE, "%u\n", size); |
a5011a26 HS |
303 | } |
304 | ||
e56341ad | 305 | static ssize_t max_read_buffer_kb_store(struct device *csdev, |
a5011a26 HS |
306 | struct device_attribute *attr, |
307 | const char *buf, size_t count) | |
308 | { | |
c88db469 | 309 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
310 | struct comedi_device *dev; |
311 | struct comedi_subdevice *s; | |
72fd9fac HS |
312 | unsigned int size; |
313 | int err; | |
314 | ||
315 | err = kstrtouint(buf, 10, &size); | |
316 | if (err) | |
317 | return err; | |
318 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 319 | return -EINVAL; |
72fd9fac | 320 | size *= 1024; |
a5011a26 | 321 | |
be535c9a | 322 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 323 | if (!dev) |
c88db469 IA |
324 | return -ENODEV; |
325 | ||
7f4656c5 | 326 | mutex_lock(&dev->mutex); |
da56fdc6 | 327 | s = comedi_read_subdevice(dev, minor); |
72fd9fac HS |
328 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
329 | s->async->max_bufsize = size; | |
330 | else | |
331 | err = -EINVAL; | |
7f4656c5 | 332 | mutex_unlock(&dev->mutex); |
a5011a26 | 333 | |
be535c9a | 334 | comedi_dev_put(dev); |
72fd9fac | 335 | return err ? err : count; |
a5011a26 | 336 | } |
e56341ad | 337 | static DEVICE_ATTR_RW(max_read_buffer_kb); |
a5011a26 | 338 | |
e56341ad | 339 | static ssize_t read_buffer_kb_show(struct device *csdev, |
a5011a26 HS |
340 | struct device_attribute *attr, char *buf) |
341 | { | |
c88db469 | 342 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
343 | struct comedi_device *dev; |
344 | struct comedi_subdevice *s; | |
72fd9fac | 345 | unsigned int size = 0; |
a5011a26 | 346 | |
be535c9a | 347 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 348 | if (!dev) |
c88db469 IA |
349 | return -ENODEV; |
350 | ||
7f4656c5 | 351 | mutex_lock(&dev->mutex); |
da56fdc6 | 352 | s = comedi_read_subdevice(dev, minor); |
72fd9fac HS |
353 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
354 | size = s->async->prealloc_bufsz / 1024; | |
7f4656c5 | 355 | mutex_unlock(&dev->mutex); |
a5011a26 | 356 | |
be535c9a | 357 | comedi_dev_put(dev); |
ecd56ff9 | 358 | return snprintf(buf, PAGE_SIZE, "%u\n", size); |
a5011a26 HS |
359 | } |
360 | ||
e56341ad | 361 | static ssize_t read_buffer_kb_store(struct device *csdev, |
a5011a26 HS |
362 | struct device_attribute *attr, |
363 | const char *buf, size_t count) | |
364 | { | |
c88db469 | 365 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
366 | struct comedi_device *dev; |
367 | struct comedi_subdevice *s; | |
72fd9fac HS |
368 | unsigned int size; |
369 | int err; | |
370 | ||
371 | err = kstrtouint(buf, 10, &size); | |
372 | if (err) | |
373 | return err; | |
374 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 375 | return -EINVAL; |
72fd9fac | 376 | size *= 1024; |
a5011a26 | 377 | |
be535c9a | 378 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 379 | if (!dev) |
c88db469 IA |
380 | return -ENODEV; |
381 | ||
7f4656c5 | 382 | mutex_lock(&dev->mutex); |
da56fdc6 | 383 | s = comedi_read_subdevice(dev, minor); |
72fd9fac | 384 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
482f0a21 | 385 | err = resize_async_buffer(dev, s, size); |
72fd9fac HS |
386 | else |
387 | err = -EINVAL; | |
7f4656c5 | 388 | mutex_unlock(&dev->mutex); |
a5011a26 | 389 | |
be535c9a | 390 | comedi_dev_put(dev); |
72fd9fac | 391 | return err ? err : count; |
a5011a26 | 392 | } |
e56341ad | 393 | static DEVICE_ATTR_RW(read_buffer_kb); |
883db3d9 | 394 | |
e56341ad | 395 | static ssize_t max_write_buffer_kb_show(struct device *csdev, |
a5011a26 HS |
396 | struct device_attribute *attr, |
397 | char *buf) | |
398 | { | |
c88db469 | 399 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
400 | struct comedi_device *dev; |
401 | struct comedi_subdevice *s; | |
72fd9fac | 402 | unsigned int size = 0; |
a5011a26 | 403 | |
be535c9a | 404 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 405 | if (!dev) |
c88db469 IA |
406 | return -ENODEV; |
407 | ||
7f4656c5 | 408 | mutex_lock(&dev->mutex); |
da56fdc6 | 409 | s = comedi_write_subdevice(dev, minor); |
72fd9fac HS |
410 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
411 | size = s->async->max_bufsize / 1024; | |
7f4656c5 | 412 | mutex_unlock(&dev->mutex); |
a5011a26 | 413 | |
be535c9a | 414 | comedi_dev_put(dev); |
ecd56ff9 | 415 | return snprintf(buf, PAGE_SIZE, "%u\n", size); |
a5011a26 HS |
416 | } |
417 | ||
e56341ad | 418 | static ssize_t max_write_buffer_kb_store(struct device *csdev, |
a5011a26 HS |
419 | struct device_attribute *attr, |
420 | const char *buf, size_t count) | |
421 | { | |
c88db469 | 422 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
423 | struct comedi_device *dev; |
424 | struct comedi_subdevice *s; | |
72fd9fac HS |
425 | unsigned int size; |
426 | int err; | |
427 | ||
428 | err = kstrtouint(buf, 10, &size); | |
429 | if (err) | |
430 | return err; | |
431 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 432 | return -EINVAL; |
72fd9fac | 433 | size *= 1024; |
a5011a26 | 434 | |
be535c9a | 435 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 436 | if (!dev) |
c88db469 IA |
437 | return -ENODEV; |
438 | ||
7f4656c5 | 439 | mutex_lock(&dev->mutex); |
da56fdc6 | 440 | s = comedi_write_subdevice(dev, minor); |
72fd9fac HS |
441 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
442 | s->async->max_bufsize = size; | |
443 | else | |
444 | err = -EINVAL; | |
7f4656c5 | 445 | mutex_unlock(&dev->mutex); |
a5011a26 | 446 | |
be535c9a | 447 | comedi_dev_put(dev); |
72fd9fac | 448 | return err ? err : count; |
a5011a26 | 449 | } |
e56341ad | 450 | static DEVICE_ATTR_RW(max_write_buffer_kb); |
a5011a26 | 451 | |
e56341ad | 452 | static ssize_t write_buffer_kb_show(struct device *csdev, |
a5011a26 HS |
453 | struct device_attribute *attr, char *buf) |
454 | { | |
c88db469 | 455 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
456 | struct comedi_device *dev; |
457 | struct comedi_subdevice *s; | |
72fd9fac | 458 | unsigned int size = 0; |
a5011a26 | 459 | |
be535c9a | 460 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 461 | if (!dev) |
c88db469 IA |
462 | return -ENODEV; |
463 | ||
7f4656c5 | 464 | mutex_lock(&dev->mutex); |
da56fdc6 | 465 | s = comedi_write_subdevice(dev, minor); |
72fd9fac HS |
466 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
467 | size = s->async->prealloc_bufsz / 1024; | |
7f4656c5 | 468 | mutex_unlock(&dev->mutex); |
a5011a26 | 469 | |
be535c9a | 470 | comedi_dev_put(dev); |
ecd56ff9 | 471 | return snprintf(buf, PAGE_SIZE, "%u\n", size); |
a5011a26 HS |
472 | } |
473 | ||
e56341ad | 474 | static ssize_t write_buffer_kb_store(struct device *csdev, |
a5011a26 HS |
475 | struct device_attribute *attr, |
476 | const char *buf, size_t count) | |
477 | { | |
c88db469 | 478 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
479 | struct comedi_device *dev; |
480 | struct comedi_subdevice *s; | |
72fd9fac HS |
481 | unsigned int size; |
482 | int err; | |
483 | ||
484 | err = kstrtouint(buf, 10, &size); | |
485 | if (err) | |
486 | return err; | |
487 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 488 | return -EINVAL; |
72fd9fac | 489 | size *= 1024; |
a5011a26 | 490 | |
be535c9a | 491 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 492 | if (!dev) |
c88db469 IA |
493 | return -ENODEV; |
494 | ||
7f4656c5 | 495 | mutex_lock(&dev->mutex); |
da56fdc6 | 496 | s = comedi_write_subdevice(dev, minor); |
72fd9fac | 497 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
482f0a21 | 498 | err = resize_async_buffer(dev, s, size); |
72fd9fac HS |
499 | else |
500 | err = -EINVAL; | |
7f4656c5 | 501 | mutex_unlock(&dev->mutex); |
a5011a26 | 502 | |
be535c9a | 503 | comedi_dev_put(dev); |
72fd9fac | 504 | return err ? err : count; |
a5011a26 | 505 | } |
e56341ad GKH |
506 | static DEVICE_ATTR_RW(write_buffer_kb); |
507 | ||
508 | static struct attribute *comedi_dev_attrs[] = { | |
509 | &dev_attr_max_read_buffer_kb.attr, | |
510 | &dev_attr_read_buffer_kb.attr, | |
511 | &dev_attr_max_write_buffer_kb.attr, | |
512 | &dev_attr_write_buffer_kb.attr, | |
513 | NULL, | |
a5011a26 | 514 | }; |
e56341ad | 515 | ATTRIBUTE_GROUPS(comedi_dev); |
ed9eccbe | 516 | |
2aae0076 HS |
517 | static void comedi_set_subdevice_runflags(struct comedi_subdevice *s, |
518 | unsigned mask, unsigned bits) | |
519 | { | |
520 | unsigned long flags; | |
521 | ||
522 | spin_lock_irqsave(&s->spin_lock, flags); | |
523 | s->runflags &= ~mask; | |
524 | s->runflags |= (bits & mask); | |
525 | spin_unlock_irqrestore(&s->spin_lock, flags); | |
526 | } | |
527 | ||
ade1764f | 528 | static unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s) |
74120719 HS |
529 | { |
530 | unsigned long flags; | |
531 | unsigned runflags; | |
532 | ||
533 | spin_lock_irqsave(&s->spin_lock, flags); | |
534 | runflags = s->runflags; | |
535 | spin_unlock_irqrestore(&s->spin_lock, flags); | |
536 | return runflags; | |
537 | } | |
74120719 | 538 | |
e0dac318 HS |
539 | bool comedi_is_subdevice_running(struct comedi_subdevice *s) |
540 | { | |
541 | unsigned runflags = comedi_get_subdevice_runflags(s); | |
542 | ||
543 | return (runflags & SRF_RUNNING) ? true : false; | |
544 | } | |
545 | EXPORT_SYMBOL_GPL(comedi_is_subdevice_running); | |
546 | ||
c098c21a HS |
547 | static bool comedi_is_subdevice_in_error(struct comedi_subdevice *s) |
548 | { | |
549 | unsigned runflags = comedi_get_subdevice_runflags(s); | |
550 | ||
551 | return (runflags & SRF_ERROR) ? true : false; | |
552 | } | |
553 | ||
9682e28c HS |
554 | static bool comedi_is_subdevice_idle(struct comedi_subdevice *s) |
555 | { | |
556 | unsigned runflags = comedi_get_subdevice_runflags(s); | |
557 | ||
558 | return (runflags & (SRF_ERROR | SRF_RUNNING)) ? false : true; | |
559 | } | |
560 | ||
588ba6dc | 561 | /** |
0480bcb9 | 562 | * comedi_alloc_spriv() - Allocate memory for the subdevice private data. |
588ba6dc | 563 | * @s: comedi_subdevice struct |
0480bcb9 | 564 | * @size: size of the memory to allocate |
588ba6dc HS |
565 | * |
566 | * This also sets the subdevice runflags to allow the core to automatically | |
567 | * free the private data during the detach. | |
568 | */ | |
0480bcb9 | 569 | void *comedi_alloc_spriv(struct comedi_subdevice *s, size_t size) |
588ba6dc | 570 | { |
0480bcb9 HS |
571 | s->private = kzalloc(size, GFP_KERNEL); |
572 | if (s->private) | |
67aa4acb | 573 | s->runflags |= SRF_FREE_SPRIV; |
0480bcb9 | 574 | return s->private; |
588ba6dc | 575 | } |
0480bcb9 | 576 | EXPORT_SYMBOL_GPL(comedi_alloc_spriv); |
588ba6dc | 577 | |
2aae0076 HS |
578 | /* |
579 | This function restores a subdevice to an idle state. | |
580 | */ | |
581 | static void do_become_nonbusy(struct comedi_device *dev, | |
582 | struct comedi_subdevice *s) | |
583 | { | |
584 | struct comedi_async *async = s->async; | |
585 | ||
586 | comedi_set_subdevice_runflags(s, SRF_RUNNING, 0); | |
587 | if (async) { | |
fcc18a9a | 588 | comedi_buf_reset(s); |
2aae0076 HS |
589 | async->inttrig = NULL; |
590 | kfree(async->cmd.chanlist); | |
591 | async->cmd.chanlist = NULL; | |
8da8c86f IA |
592 | s->busy = NULL; |
593 | wake_up_interruptible_all(&s->async->wait_head); | |
2aae0076 HS |
594 | } else { |
595 | dev_err(dev->class_dev, | |
596 | "BUG: (?) do_become_nonbusy called with async=NULL\n"); | |
8da8c86f | 597 | s->busy = NULL; |
2aae0076 | 598 | } |
2aae0076 HS |
599 | } |
600 | ||
601 | static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s) | |
602 | { | |
603 | int ret = 0; | |
604 | ||
f0124630 | 605 | if (comedi_is_subdevice_running(s) && s->cancel) |
2aae0076 HS |
606 | ret = s->cancel(dev, s); |
607 | ||
608 | do_become_nonbusy(dev, s); | |
609 | ||
610 | return ret; | |
611 | } | |
612 | ||
d19db51a IA |
613 | void comedi_device_cancel_all(struct comedi_device *dev) |
614 | { | |
615 | struct comedi_subdevice *s; | |
616 | int i; | |
617 | ||
618 | if (!dev->attached) | |
619 | return; | |
620 | ||
621 | for (i = 0; i < dev->n_subdevices; i++) { | |
622 | s = &dev->subdevices[i]; | |
623 | if (s->async) | |
624 | do_cancel(dev, s); | |
625 | } | |
626 | } | |
627 | ||
2aae0076 HS |
628 | static int is_device_busy(struct comedi_device *dev) |
629 | { | |
630 | struct comedi_subdevice *s; | |
631 | int i; | |
632 | ||
633 | if (!dev->attached) | |
634 | return 0; | |
635 | ||
636 | for (i = 0; i < dev->n_subdevices; i++) { | |
637 | s = &dev->subdevices[i]; | |
638 | if (s->busy) | |
639 | return 1; | |
d4526ab4 | 640 | if (s->async && comedi_buf_is_mmapped(s)) |
2aae0076 HS |
641 | return 1; |
642 | } | |
643 | ||
644 | return 0; | |
645 | } | |
646 | ||
ed9eccbe DS |
647 | /* |
648 | COMEDI_DEVCONFIG | |
649 | device config ioctl | |
650 | ||
651 | arg: | |
652 | pointer to devconfig structure | |
653 | ||
654 | reads: | |
655 | devconfig structure at arg | |
656 | ||
657 | writes: | |
658 | none | |
659 | */ | |
0a85b6f0 | 660 | static int do_devconfig_ioctl(struct comedi_device *dev, |
92d0127c | 661 | struct comedi_devconfig __user *arg) |
ed9eccbe | 662 | { |
0707bb04 | 663 | struct comedi_devconfig it; |
ed9eccbe DS |
664 | |
665 | if (!capable(CAP_SYS_ADMIN)) | |
666 | return -EPERM; | |
667 | ||
668 | if (arg == NULL) { | |
669 | if (is_device_busy(dev)) | |
670 | return -EBUSY; | |
476b8477 | 671 | if (dev->attached) { |
ed9eccbe | 672 | struct module *driver_module = dev->driver->module; |
4bac39f6 | 673 | |
ed9eccbe DS |
674 | comedi_device_detach(dev); |
675 | module_put(driver_module); | |
676 | } | |
677 | return 0; | |
678 | } | |
679 | ||
bc252fd1 | 680 | if (copy_from_user(&it, arg, sizeof(it))) |
ed9eccbe DS |
681 | return -EFAULT; |
682 | ||
683 | it.board_name[COMEDI_NAMELEN - 1] = 0; | |
684 | ||
d1843132 HS |
685 | if (it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) { |
686 | dev_warn(dev->class_dev, | |
687 | "comedi_config --init_data is deprecated\n"); | |
688 | return -EINVAL; | |
ed9eccbe DS |
689 | } |
690 | ||
8ab4ed6e IA |
691 | if (dev->minor >= comedi_num_legacy_minors) |
692 | /* don't re-use dynamically allocated comedi devices */ | |
693 | return -EBUSY; | |
694 | ||
b2a644b4 IA |
695 | /* This increments the driver module count on success. */ |
696 | return comedi_device_attach(dev, &it); | |
ed9eccbe DS |
697 | } |
698 | ||
699 | /* | |
700 | COMEDI_BUFCONFIG | |
701 | buffer configuration ioctl | |
702 | ||
703 | arg: | |
704 | pointer to bufconfig structure | |
705 | ||
706 | reads: | |
707 | bufconfig at arg | |
708 | ||
709 | writes: | |
710 | modified bufconfig at arg | |
711 | ||
712 | */ | |
92d0127c GKH |
713 | static int do_bufconfig_ioctl(struct comedi_device *dev, |
714 | struct comedi_bufconfig __user *arg) | |
ed9eccbe | 715 | { |
be6aba4a | 716 | struct comedi_bufconfig bc; |
d163679c | 717 | struct comedi_async *async; |
34c43922 | 718 | struct comedi_subdevice *s; |
883db3d9 | 719 | int retval = 0; |
ed9eccbe | 720 | |
bc252fd1 | 721 | if (copy_from_user(&bc, arg, sizeof(bc))) |
ed9eccbe DS |
722 | return -EFAULT; |
723 | ||
11f80ddf | 724 | if (bc.subdevice >= dev->n_subdevices) |
ed9eccbe DS |
725 | return -EINVAL; |
726 | ||
b077f2cd | 727 | s = &dev->subdevices[bc.subdevice]; |
ed9eccbe DS |
728 | async = s->async; |
729 | ||
730 | if (!async) { | |
272850f0 HS |
731 | dev_dbg(dev->class_dev, |
732 | "subdevice does not have async capability\n"); | |
ed9eccbe DS |
733 | bc.size = 0; |
734 | bc.maximum_size = 0; | |
735 | goto copyback; | |
736 | } | |
737 | ||
738 | if (bc.maximum_size) { | |
739 | if (!capable(CAP_SYS_ADMIN)) | |
740 | return -EPERM; | |
741 | ||
742 | async->max_bufsize = bc.maximum_size; | |
743 | } | |
744 | ||
745 | if (bc.size) { | |
482f0a21 | 746 | retval = resize_async_buffer(dev, s, bc.size); |
883db3d9 FMH |
747 | if (retval < 0) |
748 | return retval; | |
ed9eccbe DS |
749 | } |
750 | ||
751 | bc.size = async->prealloc_bufsz; | |
752 | bc.maximum_size = async->max_bufsize; | |
753 | ||
476b8477 | 754 | copyback: |
bc252fd1 | 755 | if (copy_to_user(arg, &bc, sizeof(bc))) |
ed9eccbe DS |
756 | return -EFAULT; |
757 | ||
758 | return 0; | |
759 | } | |
760 | ||
761 | /* | |
762 | COMEDI_DEVINFO | |
763 | device info ioctl | |
764 | ||
765 | arg: | |
766 | pointer to devinfo structure | |
767 | ||
768 | reads: | |
769 | none | |
770 | ||
771 | writes: | |
772 | devinfo structure | |
773 | ||
774 | */ | |
0a85b6f0 | 775 | static int do_devinfo_ioctl(struct comedi_device *dev, |
92d0127c GKH |
776 | struct comedi_devinfo __user *arg, |
777 | struct file *file) | |
ed9eccbe | 778 | { |
6131ffaa | 779 | const unsigned minor = iminor(file_inode(file)); |
0e700923 HS |
780 | struct comedi_subdevice *s; |
781 | struct comedi_devinfo devinfo; | |
ed9eccbe DS |
782 | |
783 | memset(&devinfo, 0, sizeof(devinfo)); | |
784 | ||
785 | /* fill devinfo structure */ | |
786 | devinfo.version_code = COMEDI_VERSION_CODE; | |
787 | devinfo.n_subdevs = dev->n_subdevices; | |
819cbb12 VK |
788 | strlcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN); |
789 | strlcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN); | |
ed9eccbe | 790 | |
da56fdc6 | 791 | s = comedi_read_subdevice(dev, minor); |
0e700923 | 792 | if (s) |
90a35c15 | 793 | devinfo.read_subdevice = s->index; |
476b8477 | 794 | else |
ed9eccbe | 795 | devinfo.read_subdevice = -1; |
476b8477 | 796 | |
da56fdc6 | 797 | s = comedi_write_subdevice(dev, minor); |
0e700923 | 798 | if (s) |
90a35c15 | 799 | devinfo.write_subdevice = s->index; |
476b8477 | 800 | else |
ed9eccbe | 801 | devinfo.write_subdevice = -1; |
ed9eccbe | 802 | |
bc252fd1 | 803 | if (copy_to_user(arg, &devinfo, sizeof(devinfo))) |
ed9eccbe DS |
804 | return -EFAULT; |
805 | ||
806 | return 0; | |
807 | } | |
808 | ||
809 | /* | |
810 | COMEDI_SUBDINFO | |
811 | subdevice info ioctl | |
812 | ||
813 | arg: | |
814 | pointer to array of subdevice info structures | |
815 | ||
816 | reads: | |
817 | none | |
818 | ||
819 | writes: | |
820 | array of subdevice info structures at arg | |
821 | ||
822 | */ | |
0a85b6f0 | 823 | static int do_subdinfo_ioctl(struct comedi_device *dev, |
92d0127c | 824 | struct comedi_subdinfo __user *arg, void *file) |
ed9eccbe DS |
825 | { |
826 | int ret, i; | |
bd52efbb | 827 | struct comedi_subdinfo *tmp, *us; |
34c43922 | 828 | struct comedi_subdevice *s; |
ed9eccbe | 829 | |
bc252fd1 | 830 | tmp = kcalloc(dev->n_subdevices, sizeof(*tmp), GFP_KERNEL); |
ed9eccbe DS |
831 | if (!tmp) |
832 | return -ENOMEM; | |
833 | ||
834 | /* fill subdinfo structs */ | |
835 | for (i = 0; i < dev->n_subdevices; i++) { | |
b077f2cd | 836 | s = &dev->subdevices[i]; |
ed9eccbe DS |
837 | us = tmp + i; |
838 | ||
839 | us->type = s->type; | |
840 | us->n_chan = s->n_chan; | |
841 | us->subd_flags = s->subdev_flags; | |
f0124630 | 842 | if (comedi_is_subdevice_running(s)) |
ed9eccbe DS |
843 | us->subd_flags |= SDF_RUNNING; |
844 | #define TIMER_nanosec 5 /* backwards compatibility */ | |
845 | us->timer_type = TIMER_nanosec; | |
846 | us->len_chanlist = s->len_chanlist; | |
847 | us->maxdata = s->maxdata; | |
848 | if (s->range_table) { | |
849 | us->range_type = | |
476b8477 | 850 | (i << 24) | (0 << 16) | (s->range_table->length); |
ed9eccbe DS |
851 | } else { |
852 | us->range_type = 0; /* XXX */ | |
853 | } | |
ed9eccbe DS |
854 | |
855 | if (s->busy) | |
856 | us->subd_flags |= SDF_BUSY; | |
857 | if (s->busy == file) | |
858 | us->subd_flags |= SDF_BUSY_OWNER; | |
859 | if (s->lock) | |
860 | us->subd_flags |= SDF_LOCKED; | |
861 | if (s->lock == file) | |
862 | us->subd_flags |= SDF_LOCK_OWNER; | |
863 | if (!s->maxdata && s->maxdata_list) | |
864 | us->subd_flags |= SDF_MAXDATA; | |
ed9eccbe DS |
865 | if (s->range_table_list) |
866 | us->subd_flags |= SDF_RANGETYPE; | |
867 | if (s->do_cmd) | |
868 | us->subd_flags |= SDF_CMD; | |
869 | ||
870 | if (s->insn_bits != &insn_inval) | |
871 | us->insn_bits_support = COMEDI_SUPPORTED; | |
872 | else | |
873 | us->insn_bits_support = COMEDI_UNSUPPORTED; | |
ed9eccbe DS |
874 | } |
875 | ||
bc252fd1 | 876 | ret = copy_to_user(arg, tmp, dev->n_subdevices * sizeof(*tmp)); |
ed9eccbe DS |
877 | |
878 | kfree(tmp); | |
879 | ||
880 | return ret ? -EFAULT : 0; | |
881 | } | |
882 | ||
883 | /* | |
884 | COMEDI_CHANINFO | |
885 | subdevice info ioctl | |
886 | ||
887 | arg: | |
888 | pointer to chaninfo structure | |
889 | ||
890 | reads: | |
891 | chaninfo structure at arg | |
892 | ||
893 | writes: | |
894 | arrays at elements of chaninfo structure | |
895 | ||
896 | */ | |
0a85b6f0 | 897 | static int do_chaninfo_ioctl(struct comedi_device *dev, |
92d0127c | 898 | struct comedi_chaninfo __user *arg) |
ed9eccbe | 899 | { |
34c43922 | 900 | struct comedi_subdevice *s; |
a18b416d | 901 | struct comedi_chaninfo it; |
ed9eccbe | 902 | |
bc252fd1 | 903 | if (copy_from_user(&it, arg, sizeof(it))) |
ed9eccbe DS |
904 | return -EFAULT; |
905 | ||
906 | if (it.subdev >= dev->n_subdevices) | |
907 | return -EINVAL; | |
b077f2cd | 908 | s = &dev->subdevices[it.subdev]; |
ed9eccbe DS |
909 | |
910 | if (it.maxdata_list) { | |
911 | if (s->maxdata || !s->maxdata_list) | |
912 | return -EINVAL; | |
913 | if (copy_to_user(it.maxdata_list, s->maxdata_list, | |
790c5541 | 914 | s->n_chan * sizeof(unsigned int))) |
ed9eccbe DS |
915 | return -EFAULT; |
916 | } | |
917 | ||
64d9b1d2 IA |
918 | if (it.flaglist) |
919 | return -EINVAL; /* flaglist not supported */ | |
ed9eccbe DS |
920 | |
921 | if (it.rangelist) { | |
922 | int i; | |
923 | ||
924 | if (!s->range_table_list) | |
925 | return -EINVAL; | |
926 | for (i = 0; i < s->n_chan; i++) { | |
927 | int x; | |
928 | ||
929 | x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) | | |
476b8477 | 930 | (s->range_table_list[i]->length); |
81604d43 VK |
931 | if (put_user(x, it.rangelist + i)) |
932 | return -EFAULT; | |
ed9eccbe | 933 | } |
476b8477 GKH |
934 | #if 0 |
935 | if (copy_to_user(it.rangelist, s->range_type_list, | |
0a85b6f0 | 936 | s->n_chan * sizeof(unsigned int))) |
476b8477 GKH |
937 | return -EFAULT; |
938 | #endif | |
ed9eccbe DS |
939 | } |
940 | ||
941 | return 0; | |
942 | } | |
943 | ||
944 | /* | |
945 | COMEDI_BUFINFO | |
946 | buffer information ioctl | |
947 | ||
948 | arg: | |
949 | pointer to bufinfo structure | |
950 | ||
951 | reads: | |
952 | bufinfo at arg | |
953 | ||
954 | writes: | |
955 | modified bufinfo at arg | |
956 | ||
957 | */ | |
92d0127c | 958 | static int do_bufinfo_ioctl(struct comedi_device *dev, |
53fa827e | 959 | struct comedi_bufinfo __user *arg, void *file) |
ed9eccbe | 960 | { |
9aa5339a | 961 | struct comedi_bufinfo bi; |
34c43922 | 962 | struct comedi_subdevice *s; |
d163679c | 963 | struct comedi_async *async; |
ed9eccbe | 964 | |
bc252fd1 | 965 | if (copy_from_user(&bi, arg, sizeof(bi))) |
ed9eccbe DS |
966 | return -EFAULT; |
967 | ||
7b1a5e2f | 968 | if (bi.subdevice >= dev->n_subdevices) |
ed9eccbe DS |
969 | return -EINVAL; |
970 | ||
b077f2cd | 971 | s = &dev->subdevices[bi.subdevice]; |
53fa827e | 972 | |
ed9eccbe DS |
973 | async = s->async; |
974 | ||
975 | if (!async) { | |
272850f0 HS |
976 | dev_dbg(dev->class_dev, |
977 | "subdevice does not have async capability\n"); | |
ed9eccbe DS |
978 | bi.buf_write_ptr = 0; |
979 | bi.buf_read_ptr = 0; | |
980 | bi.buf_write_count = 0; | |
981 | bi.buf_read_count = 0; | |
4772c018 IA |
982 | bi.bytes_read = 0; |
983 | bi.bytes_written = 0; | |
ed9eccbe DS |
984 | goto copyback; |
985 | } | |
53fa827e IA |
986 | if (!s->busy) { |
987 | bi.bytes_read = 0; | |
988 | bi.bytes_written = 0; | |
989 | goto copyback_position; | |
990 | } | |
991 | if (s->busy != file) | |
992 | return -EACCES; | |
ed9eccbe DS |
993 | |
994 | if (bi.bytes_read && (s->subdev_flags & SDF_CMD_READ)) { | |
d13be55a | 995 | bi.bytes_read = comedi_buf_read_alloc(s, bi.bytes_read); |
f1df8662 | 996 | comedi_buf_read_free(s, bi.bytes_read); |
ed9eccbe | 997 | |
9682e28c | 998 | if (comedi_is_subdevice_idle(s) && |
f4f3f7cf | 999 | comedi_buf_n_bytes_ready(s) == 0) { |
ed9eccbe DS |
1000 | do_become_nonbusy(dev, s); |
1001 | } | |
1002 | } | |
1003 | ||
1004 | if (bi.bytes_written && (s->subdev_flags & SDF_CMD_WRITE)) { | |
1005 | bi.bytes_written = | |
24e894bb | 1006 | comedi_buf_write_alloc(s, bi.bytes_written); |
940dd35d | 1007 | comedi_buf_write_free(s, bi.bytes_written); |
ed9eccbe DS |
1008 | } |
1009 | ||
53fa827e | 1010 | copyback_position: |
ed9eccbe DS |
1011 | bi.buf_write_count = async->buf_write_count; |
1012 | bi.buf_write_ptr = async->buf_write_ptr; | |
1013 | bi.buf_read_count = async->buf_read_count; | |
1014 | bi.buf_read_ptr = async->buf_read_ptr; | |
1015 | ||
476b8477 | 1016 | copyback: |
bc252fd1 | 1017 | if (copy_to_user(arg, &bi, sizeof(bi))) |
ed9eccbe DS |
1018 | return -EFAULT; |
1019 | ||
1020 | return 0; | |
1021 | } | |
1022 | ||
0a85b6f0 MT |
1023 | static int check_insn_config_length(struct comedi_insn *insn, |
1024 | unsigned int *data) | |
ed9eccbe | 1025 | { |
476b8477 GKH |
1026 | if (insn->n < 1) |
1027 | return -EINVAL; | |
ed9eccbe DS |
1028 | |
1029 | switch (data[0]) { | |
1030 | case INSN_CONFIG_DIO_OUTPUT: | |
1031 | case INSN_CONFIG_DIO_INPUT: | |
1032 | case INSN_CONFIG_DISARM: | |
1033 | case INSN_CONFIG_RESET: | |
1034 | if (insn->n == 1) | |
1035 | return 0; | |
1036 | break; | |
1037 | case INSN_CONFIG_ARM: | |
1038 | case INSN_CONFIG_DIO_QUERY: | |
1039 | case INSN_CONFIG_BLOCK_SIZE: | |
1040 | case INSN_CONFIG_FILTER: | |
1041 | case INSN_CONFIG_SERIAL_CLOCK: | |
1042 | case INSN_CONFIG_BIDIRECTIONAL_DATA: | |
1043 | case INSN_CONFIG_ALT_SOURCE: | |
1044 | case INSN_CONFIG_SET_COUNTER_MODE: | |
1045 | case INSN_CONFIG_8254_READ_STATUS: | |
1046 | case INSN_CONFIG_SET_ROUTING: | |
1047 | case INSN_CONFIG_GET_ROUTING: | |
1048 | case INSN_CONFIG_GET_PWM_STATUS: | |
1049 | case INSN_CONFIG_PWM_SET_PERIOD: | |
1050 | case INSN_CONFIG_PWM_GET_PERIOD: | |
1051 | if (insn->n == 2) | |
1052 | return 0; | |
1053 | break; | |
1054 | case INSN_CONFIG_SET_GATE_SRC: | |
1055 | case INSN_CONFIG_GET_GATE_SRC: | |
1056 | case INSN_CONFIG_SET_CLOCK_SRC: | |
1057 | case INSN_CONFIG_GET_CLOCK_SRC: | |
1058 | case INSN_CONFIG_SET_OTHER_SRC: | |
1059 | case INSN_CONFIG_GET_COUNTER_STATUS: | |
1060 | case INSN_CONFIG_PWM_SET_H_BRIDGE: | |
1061 | case INSN_CONFIG_PWM_GET_H_BRIDGE: | |
1062 | case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE: | |
1063 | if (insn->n == 3) | |
1064 | return 0; | |
1065 | break; | |
1066 | case INSN_CONFIG_PWM_OUTPUT: | |
1067 | case INSN_CONFIG_ANALOG_TRIG: | |
1068 | if (insn->n == 5) | |
1069 | return 0; | |
1070 | break; | |
b0a2b6d8 IA |
1071 | case INSN_CONFIG_DIGITAL_TRIG: |
1072 | if (insn->n == 6) | |
1073 | return 0; | |
1074 | break; | |
0a85b6f0 MT |
1075 | /* by default we allow the insn since we don't have checks for |
1076 | * all possible cases yet */ | |
ed9eccbe | 1077 | default: |
c2ad078b | 1078 | pr_warn("No check for data length of config insn id %i is implemented\n", |
4f870fe6 | 1079 | data[0]); |
c2ad078b HS |
1080 | pr_warn("Add a check to %s in %s\n", __func__, __FILE__); |
1081 | pr_warn("Assuming n=%i is correct\n", insn->n); | |
ed9eccbe | 1082 | return 0; |
ed9eccbe DS |
1083 | } |
1084 | return -EINVAL; | |
1085 | } | |
1086 | ||
0a85b6f0 MT |
1087 | static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn, |
1088 | unsigned int *data, void *file) | |
ed9eccbe | 1089 | { |
34c43922 | 1090 | struct comedi_subdevice *s; |
ed9eccbe DS |
1091 | int ret = 0; |
1092 | int i; | |
1093 | ||
1094 | if (insn->insn & INSN_MASK_SPECIAL) { | |
1095 | /* a non-subdevice instruction */ | |
1096 | ||
1097 | switch (insn->insn) { | |
1098 | case INSN_GTOD: | |
1099 | { | |
1100 | struct timeval tv; | |
1101 | ||
1102 | if (insn->n != 2) { | |
1103 | ret = -EINVAL; | |
1104 | break; | |
1105 | } | |
1106 | ||
1107 | do_gettimeofday(&tv); | |
1108 | data[0] = tv.tv_sec; | |
1109 | data[1] = tv.tv_usec; | |
1110 | ret = 2; | |
1111 | ||
1112 | break; | |
1113 | } | |
1114 | case INSN_WAIT: | |
1115 | if (insn->n != 1 || data[0] >= 100000) { | |
1116 | ret = -EINVAL; | |
1117 | break; | |
1118 | } | |
1119 | udelay(data[0] / 1000); | |
1120 | ret = 1; | |
1121 | break; | |
1122 | case INSN_INTTRIG: | |
1123 | if (insn->n != 1) { | |
1124 | ret = -EINVAL; | |
1125 | break; | |
1126 | } | |
1127 | if (insn->subdev >= dev->n_subdevices) { | |
272850f0 HS |
1128 | dev_dbg(dev->class_dev, |
1129 | "%d not usable subdevice\n", | |
ed9eccbe DS |
1130 | insn->subdev); |
1131 | ret = -EINVAL; | |
1132 | break; | |
1133 | } | |
b077f2cd | 1134 | s = &dev->subdevices[insn->subdev]; |
ed9eccbe | 1135 | if (!s->async) { |
272850f0 | 1136 | dev_dbg(dev->class_dev, "no async\n"); |
ed9eccbe DS |
1137 | ret = -EINVAL; |
1138 | break; | |
1139 | } | |
1140 | if (!s->async->inttrig) { | |
272850f0 | 1141 | dev_dbg(dev->class_dev, "no inttrig\n"); |
ed9eccbe DS |
1142 | ret = -EAGAIN; |
1143 | break; | |
1144 | } | |
5d06e3df | 1145 | ret = s->async->inttrig(dev, s, data[0]); |
ed9eccbe DS |
1146 | if (ret >= 0) |
1147 | ret = 1; | |
1148 | break; | |
1149 | default: | |
272850f0 | 1150 | dev_dbg(dev->class_dev, "invalid insn\n"); |
ed9eccbe DS |
1151 | ret = -EINVAL; |
1152 | break; | |
1153 | } | |
1154 | } else { | |
1155 | /* a subdevice instruction */ | |
790c5541 | 1156 | unsigned int maxdata; |
ed9eccbe DS |
1157 | |
1158 | if (insn->subdev >= dev->n_subdevices) { | |
272850f0 HS |
1159 | dev_dbg(dev->class_dev, "subdevice %d out of range\n", |
1160 | insn->subdev); | |
ed9eccbe DS |
1161 | ret = -EINVAL; |
1162 | goto out; | |
1163 | } | |
b077f2cd | 1164 | s = &dev->subdevices[insn->subdev]; |
ed9eccbe DS |
1165 | |
1166 | if (s->type == COMEDI_SUBD_UNUSED) { | |
272850f0 HS |
1167 | dev_dbg(dev->class_dev, "%d not usable subdevice\n", |
1168 | insn->subdev); | |
ed9eccbe DS |
1169 | ret = -EIO; |
1170 | goto out; | |
1171 | } | |
1172 | ||
1173 | /* are we locked? (ioctl lock) */ | |
1174 | if (s->lock && s->lock != file) { | |
272850f0 | 1175 | dev_dbg(dev->class_dev, "device locked\n"); |
ed9eccbe DS |
1176 | ret = -EACCES; |
1177 | goto out; | |
1178 | } | |
1179 | ||
0fd0ca75 | 1180 | ret = comedi_check_chanlist(s, 1, &insn->chanspec); |
476b8477 | 1181 | if (ret < 0) { |
ed9eccbe | 1182 | ret = -EINVAL; |
272850f0 | 1183 | dev_dbg(dev->class_dev, "bad chanspec\n"); |
ed9eccbe DS |
1184 | goto out; |
1185 | } | |
1186 | ||
1187 | if (s->busy) { | |
1188 | ret = -EBUSY; | |
1189 | goto out; | |
1190 | } | |
1191 | /* This looks arbitrary. It is. */ | |
1192 | s->busy = &parse_insn; | |
1193 | switch (insn->insn) { | |
1194 | case INSN_READ: | |
1195 | ret = s->insn_read(dev, s, insn, data); | |
22ca19d9 HS |
1196 | if (ret == -ETIMEDOUT) { |
1197 | dev_dbg(dev->class_dev, | |
1198 | "subdevice %d read instruction timed out\n", | |
1199 | s->index); | |
1200 | } | |
ed9eccbe DS |
1201 | break; |
1202 | case INSN_WRITE: | |
1203 | maxdata = s->maxdata_list | |
476b8477 GKH |
1204 | ? s->maxdata_list[CR_CHAN(insn->chanspec)] |
1205 | : s->maxdata; | |
ed9eccbe DS |
1206 | for (i = 0; i < insn->n; ++i) { |
1207 | if (data[i] > maxdata) { | |
1208 | ret = -EINVAL; | |
272850f0 HS |
1209 | dev_dbg(dev->class_dev, |
1210 | "bad data value(s)\n"); | |
ed9eccbe DS |
1211 | break; |
1212 | } | |
1213 | } | |
22ca19d9 | 1214 | if (ret == 0) { |
ed9eccbe | 1215 | ret = s->insn_write(dev, s, insn, data); |
22ca19d9 HS |
1216 | if (ret == -ETIMEDOUT) { |
1217 | dev_dbg(dev->class_dev, | |
1218 | "subdevice %d write instruction timed out\n", | |
1219 | s->index); | |
1220 | } | |
1221 | } | |
ed9eccbe DS |
1222 | break; |
1223 | case INSN_BITS: | |
1224 | if (insn->n != 2) { | |
1225 | ret = -EINVAL; | |
2f644ccf IA |
1226 | } else { |
1227 | /* Most drivers ignore the base channel in | |
1228 | * insn->chanspec. Fix this here if | |
1229 | * the subdevice has <= 32 channels. */ | |
36efbacd HS |
1230 | unsigned int orig_mask = data[0]; |
1231 | unsigned int shift = 0; | |
2f644ccf | 1232 | |
2f644ccf IA |
1233 | if (s->n_chan <= 32) { |
1234 | shift = CR_CHAN(insn->chanspec); | |
1235 | if (shift > 0) { | |
1236 | insn->chanspec = 0; | |
1237 | data[0] <<= shift; | |
1238 | data[1] <<= shift; | |
1239 | } | |
36efbacd | 1240 | } |
2f644ccf IA |
1241 | ret = s->insn_bits(dev, s, insn, data); |
1242 | data[0] = orig_mask; | |
1243 | if (shift > 0) | |
1244 | data[1] >>= shift; | |
ed9eccbe | 1245 | } |
ed9eccbe DS |
1246 | break; |
1247 | case INSN_CONFIG: | |
1248 | ret = check_insn_config_length(insn, data); | |
1249 | if (ret) | |
1250 | break; | |
1251 | ret = s->insn_config(dev, s, insn, data); | |
1252 | break; | |
1253 | default: | |
1254 | ret = -EINVAL; | |
1255 | break; | |
1256 | } | |
1257 | ||
1258 | s->busy = NULL; | |
1259 | } | |
1260 | ||
476b8477 | 1261 | out: |
ed9eccbe DS |
1262 | return ret; |
1263 | } | |
1264 | ||
5b6cbd87 HS |
1265 | /* |
1266 | * COMEDI_INSNLIST | |
1267 | * synchronous instructions | |
1268 | * | |
1269 | * arg: | |
1270 | * pointer to sync cmd structure | |
1271 | * | |
1272 | * reads: | |
1273 | * sync cmd struct at arg | |
1274 | * instruction list | |
1275 | * data (for writes) | |
1276 | * | |
1277 | * writes: | |
1278 | * data (for reads) | |
1279 | */ | |
1280 | /* arbitrary limits */ | |
1281 | #define MAX_SAMPLES 256 | |
1282 | static int do_insnlist_ioctl(struct comedi_device *dev, | |
1283 | struct comedi_insnlist __user *arg, void *file) | |
1284 | { | |
1285 | struct comedi_insnlist insnlist; | |
1286 | struct comedi_insn *insns = NULL; | |
1287 | unsigned int *data = NULL; | |
1288 | int i = 0; | |
1289 | int ret = 0; | |
1290 | ||
1291 | if (copy_from_user(&insnlist, arg, sizeof(insnlist))) | |
1292 | return -EFAULT; | |
1293 | ||
f4a8f528 | 1294 | data = kmalloc_array(MAX_SAMPLES, sizeof(unsigned int), GFP_KERNEL); |
5b6cbd87 | 1295 | if (!data) { |
5b6cbd87 HS |
1296 | ret = -ENOMEM; |
1297 | goto error; | |
1298 | } | |
1299 | ||
1300 | insns = kcalloc(insnlist.n_insns, sizeof(*insns), GFP_KERNEL); | |
1301 | if (!insns) { | |
5b6cbd87 HS |
1302 | ret = -ENOMEM; |
1303 | goto error; | |
1304 | } | |
1305 | ||
1306 | if (copy_from_user(insns, insnlist.insns, | |
1307 | sizeof(*insns) * insnlist.n_insns)) { | |
272850f0 | 1308 | dev_dbg(dev->class_dev, "copy_from_user failed\n"); |
5b6cbd87 HS |
1309 | ret = -EFAULT; |
1310 | goto error; | |
1311 | } | |
1312 | ||
1313 | for (i = 0; i < insnlist.n_insns; i++) { | |
1314 | if (insns[i].n > MAX_SAMPLES) { | |
272850f0 HS |
1315 | dev_dbg(dev->class_dev, |
1316 | "number of samples too large\n"); | |
5b6cbd87 HS |
1317 | ret = -EINVAL; |
1318 | goto error; | |
1319 | } | |
1320 | if (insns[i].insn & INSN_MASK_WRITE) { | |
1321 | if (copy_from_user(data, insns[i].data, | |
1322 | insns[i].n * sizeof(unsigned int))) { | |
272850f0 HS |
1323 | dev_dbg(dev->class_dev, |
1324 | "copy_from_user failed\n"); | |
5b6cbd87 HS |
1325 | ret = -EFAULT; |
1326 | goto error; | |
1327 | } | |
1328 | } | |
1329 | ret = parse_insn(dev, insns + i, data, file); | |
1330 | if (ret < 0) | |
1331 | goto error; | |
1332 | if (insns[i].insn & INSN_MASK_READ) { | |
1333 | if (copy_to_user(insns[i].data, data, | |
1334 | insns[i].n * sizeof(unsigned int))) { | |
272850f0 HS |
1335 | dev_dbg(dev->class_dev, |
1336 | "copy_to_user failed\n"); | |
5b6cbd87 HS |
1337 | ret = -EFAULT; |
1338 | goto error; | |
1339 | } | |
1340 | } | |
1341 | if (need_resched()) | |
1342 | schedule(); | |
1343 | } | |
1344 | ||
1345 | error: | |
1346 | kfree(insns); | |
1347 | kfree(data); | |
1348 | ||
1349 | if (ret < 0) | |
1350 | return ret; | |
1351 | return i; | |
1352 | } | |
1353 | ||
ed9eccbe | 1354 | /* |
20617f22 PDP |
1355 | * COMEDI_INSN |
1356 | * synchronous instructions | |
ed9eccbe | 1357 | * |
20617f22 PDP |
1358 | * arg: |
1359 | * pointer to insn | |
ed9eccbe | 1360 | * |
20617f22 PDP |
1361 | * reads: |
1362 | * struct comedi_insn struct at arg | |
1363 | * data (for writes) | |
ed9eccbe | 1364 | * |
20617f22 PDP |
1365 | * writes: |
1366 | * data (for reads) | |
ed9eccbe | 1367 | */ |
92d0127c GKH |
1368 | static int do_insn_ioctl(struct comedi_device *dev, |
1369 | struct comedi_insn __user *arg, void *file) | |
ed9eccbe | 1370 | { |
90035c08 | 1371 | struct comedi_insn insn; |
790c5541 | 1372 | unsigned int *data = NULL; |
ed9eccbe DS |
1373 | int ret = 0; |
1374 | ||
f4a8f528 | 1375 | data = kmalloc_array(MAX_SAMPLES, sizeof(unsigned int), GFP_KERNEL); |
ed9eccbe DS |
1376 | if (!data) { |
1377 | ret = -ENOMEM; | |
1378 | goto error; | |
1379 | } | |
1380 | ||
bc252fd1 | 1381 | if (copy_from_user(&insn, arg, sizeof(insn))) { |
ed9eccbe DS |
1382 | ret = -EFAULT; |
1383 | goto error; | |
1384 | } | |
1385 | ||
1386 | /* This is where the behavior of insn and insnlist deviate. */ | |
1387 | if (insn.n > MAX_SAMPLES) | |
1388 | insn.n = MAX_SAMPLES; | |
1389 | if (insn.insn & INSN_MASK_WRITE) { | |
21fe2eea M |
1390 | if (copy_from_user(data, |
1391 | insn.data, | |
1392 | insn.n * sizeof(unsigned int))) { | |
ed9eccbe DS |
1393 | ret = -EFAULT; |
1394 | goto error; | |
1395 | } | |
1396 | } | |
1397 | ret = parse_insn(dev, &insn, data, file); | |
1398 | if (ret < 0) | |
1399 | goto error; | |
1400 | if (insn.insn & INSN_MASK_READ) { | |
21fe2eea M |
1401 | if (copy_to_user(insn.data, |
1402 | data, | |
1403 | insn.n * sizeof(unsigned int))) { | |
ed9eccbe DS |
1404 | ret = -EFAULT; |
1405 | goto error; | |
1406 | } | |
1407 | } | |
1408 | ret = insn.n; | |
1409 | ||
476b8477 GKH |
1410 | error: |
1411 | kfree(data); | |
ed9eccbe DS |
1412 | |
1413 | return ret; | |
1414 | } | |
1415 | ||
87ece583 HS |
1416 | static int __comedi_get_user_cmd(struct comedi_device *dev, |
1417 | struct comedi_cmd __user *arg, | |
1418 | struct comedi_cmd *cmd) | |
ed9eccbe | 1419 | { |
34c43922 | 1420 | struct comedi_subdevice *s; |
ed9eccbe | 1421 | |
87ece583 | 1422 | if (copy_from_user(cmd, arg, sizeof(*cmd))) { |
272850f0 | 1423 | dev_dbg(dev->class_dev, "bad cmd address\n"); |
ed9eccbe DS |
1424 | return -EFAULT; |
1425 | } | |
ed9eccbe | 1426 | |
87ece583 HS |
1427 | if (cmd->subdev >= dev->n_subdevices) { |
1428 | dev_dbg(dev->class_dev, "%d no such subdevice\n", cmd->subdev); | |
ed9eccbe DS |
1429 | return -ENODEV; |
1430 | } | |
1431 | ||
87ece583 | 1432 | s = &dev->subdevices[cmd->subdev]; |
ed9eccbe DS |
1433 | |
1434 | if (s->type == COMEDI_SUBD_UNUSED) { | |
b2f48741 YD |
1435 | dev_dbg(dev->class_dev, "%d not valid subdevice\n", |
1436 | cmd->subdev); | |
ed9eccbe DS |
1437 | return -EIO; |
1438 | } | |
1439 | ||
1440 | if (!s->do_cmd || !s->do_cmdtest || !s->async) { | |
272850f0 | 1441 | dev_dbg(dev->class_dev, |
b2f48741 YD |
1442 | "subdevice %d does not support commands\n", |
1443 | cmd->subdev); | |
ed9eccbe DS |
1444 | return -EIO; |
1445 | } | |
1446 | ||
87ece583 HS |
1447 | /* make sure channel/gain list isn't too long */ |
1448 | if (cmd->chanlist_len > s->len_chanlist) { | |
1449 | dev_dbg(dev->class_dev, "channel/gain list too long %d > %d\n", | |
1450 | cmd->chanlist_len, s->len_chanlist); | |
1451 | return -EINVAL; | |
1452 | } | |
1453 | ||
1454 | return 0; | |
1455 | } | |
1456 | ||
c6cd0eef HS |
1457 | static int __comedi_get_user_chanlist(struct comedi_device *dev, |
1458 | struct comedi_subdevice *s, | |
1459 | unsigned int __user *user_chanlist, | |
1460 | struct comedi_cmd *cmd) | |
1461 | { | |
1462 | unsigned int *chanlist; | |
1463 | int ret; | |
1464 | ||
1465 | /* user_chanlist could be NULL for do_cmdtest ioctls */ | |
1466 | if (!user_chanlist) | |
1467 | return 0; | |
1468 | ||
1469 | chanlist = memdup_user(user_chanlist, | |
1470 | cmd->chanlist_len * sizeof(unsigned int)); | |
1471 | if (IS_ERR(chanlist)) | |
1472 | return PTR_ERR(chanlist); | |
1473 | ||
1474 | /* make sure each element in channel/gain list is valid */ | |
1475 | ret = comedi_check_chanlist(s, cmd->chanlist_len, chanlist); | |
1476 | if (ret < 0) { | |
1477 | kfree(chanlist); | |
1478 | return ret; | |
1479 | } | |
1480 | ||
1481 | cmd->chanlist = chanlist; | |
1482 | ||
1483 | return 0; | |
1484 | } | |
1485 | ||
87ece583 HS |
1486 | static int do_cmd_ioctl(struct comedi_device *dev, |
1487 | struct comedi_cmd __user *arg, void *file) | |
1488 | { | |
1489 | struct comedi_cmd cmd; | |
1490 | struct comedi_subdevice *s; | |
1491 | struct comedi_async *async; | |
1492 | unsigned int __user *user_chanlist; | |
1493 | int ret; | |
1494 | ||
1495 | /* get the user's cmd and do some simple validation */ | |
1496 | ret = __comedi_get_user_cmd(dev, arg, &cmd); | |
1497 | if (ret) | |
1498 | return ret; | |
1499 | ||
1500 | /* save user's chanlist pointer so it can be restored later */ | |
1501 | user_chanlist = (unsigned int __user *)cmd.chanlist; | |
1502 | ||
1503 | s = &dev->subdevices[cmd.subdev]; | |
1504 | async = s->async; | |
1505 | ||
ed9eccbe DS |
1506 | /* are we locked? (ioctl lock) */ |
1507 | if (s->lock && s->lock != file) { | |
272850f0 | 1508 | dev_dbg(dev->class_dev, "subdevice locked\n"); |
ed9eccbe DS |
1509 | return -EACCES; |
1510 | } | |
1511 | ||
1512 | /* are we busy? */ | |
1513 | if (s->busy) { | |
272850f0 | 1514 | dev_dbg(dev->class_dev, "subdevice busy\n"); |
ed9eccbe DS |
1515 | return -EBUSY; |
1516 | } | |
ed9eccbe | 1517 | |
ed9eccbe | 1518 | /* make sure channel/gain list isn't too short */ |
88bc0574 | 1519 | if (cmd.chanlist_len < 1) { |
272850f0 | 1520 | dev_dbg(dev->class_dev, "channel/gain list too short %u < 1\n", |
88bc0574 | 1521 | cmd.chanlist_len); |
4b18f08b | 1522 | return -EINVAL; |
ed9eccbe DS |
1523 | } |
1524 | ||
88bc0574 | 1525 | async->cmd = cmd; |
ed9eccbe | 1526 | async->cmd.data = NULL; |
ed9eccbe | 1527 | |
c6cd0eef HS |
1528 | /* load channel/gain list */ |
1529 | ret = __comedi_get_user_chanlist(dev, s, user_chanlist, &async->cmd); | |
1530 | if (ret) | |
ed9eccbe | 1531 | goto cleanup; |
ed9eccbe DS |
1532 | |
1533 | ret = s->do_cmdtest(dev, s, &async->cmd); | |
1534 | ||
b0446a21 | 1535 | if (async->cmd.flags & CMDF_BOGUS || ret) { |
272850f0 | 1536 | dev_dbg(dev->class_dev, "test returned %d\n", ret); |
88bc0574 | 1537 | cmd = async->cmd; |
476b8477 | 1538 | /* restore chanlist pointer before copying back */ |
95bc359f | 1539 | cmd.chanlist = (unsigned int __force *)user_chanlist; |
88bc0574 | 1540 | cmd.data = NULL; |
bc252fd1 | 1541 | if (copy_to_user(arg, &cmd, sizeof(cmd))) { |
272850f0 | 1542 | dev_dbg(dev->class_dev, "fault writing cmd\n"); |
ed9eccbe DS |
1543 | ret = -EFAULT; |
1544 | goto cleanup; | |
1545 | } | |
1546 | ret = -EAGAIN; | |
1547 | goto cleanup; | |
1548 | } | |
1549 | ||
1550 | if (!async->prealloc_bufsz) { | |
1551 | ret = -ENOMEM; | |
272850f0 | 1552 | dev_dbg(dev->class_dev, "no buffer (?)\n"); |
ed9eccbe DS |
1553 | goto cleanup; |
1554 | } | |
1555 | ||
fcc18a9a | 1556 | comedi_buf_reset(s); |
ed9eccbe DS |
1557 | |
1558 | async->cb_mask = | |
476b8477 GKH |
1559 | COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR | |
1560 | COMEDI_CB_OVERFLOW; | |
d8bff6e3 | 1561 | if (async->cmd.flags & CMDF_WAKE_EOS) |
ed9eccbe | 1562 | async->cb_mask |= COMEDI_CB_EOS; |
ed9eccbe | 1563 | |
c265be01 | 1564 | comedi_set_subdevice_runflags(s, SRF_ERROR | SRF_RUNNING, SRF_RUNNING); |
ed9eccbe | 1565 | |
4b18f08b IA |
1566 | /* set s->busy _after_ setting SRF_RUNNING flag to avoid race with |
1567 | * comedi_read() or comedi_write() */ | |
1568 | s->busy = file; | |
ed9eccbe DS |
1569 | ret = s->do_cmd(dev, s); |
1570 | if (ret == 0) | |
1571 | return 0; | |
1572 | ||
476b8477 | 1573 | cleanup: |
ed9eccbe DS |
1574 | do_become_nonbusy(dev, s); |
1575 | ||
1576 | return ret; | |
1577 | } | |
1578 | ||
1579 | /* | |
1580 | COMEDI_CMDTEST | |
1581 | command testing ioctl | |
1582 | ||
1583 | arg: | |
1584 | pointer to cmd structure | |
1585 | ||
1586 | reads: | |
1587 | cmd structure at arg | |
1588 | channel/range list | |
1589 | ||
1590 | writes: | |
1591 | modified cmd structure at arg | |
1592 | ||
1593 | */ | |
92d0127c GKH |
1594 | static int do_cmdtest_ioctl(struct comedi_device *dev, |
1595 | struct comedi_cmd __user *arg, void *file) | |
ed9eccbe | 1596 | { |
f8348677 | 1597 | struct comedi_cmd cmd; |
34c43922 | 1598 | struct comedi_subdevice *s; |
95bc359f | 1599 | unsigned int __user *user_chanlist; |
87ece583 HS |
1600 | int ret; |
1601 | ||
1602 | /* get the user's cmd and do some simple validation */ | |
1603 | ret = __comedi_get_user_cmd(dev, arg, &cmd); | |
1604 | if (ret) | |
1605 | return ret; | |
ed9eccbe | 1606 | |
476b8477 | 1607 | /* save user's chanlist pointer so it can be restored later */ |
95bc359f | 1608 | user_chanlist = (unsigned int __user *)cmd.chanlist; |
ed9eccbe | 1609 | |
f8348677 | 1610 | s = &dev->subdevices[cmd.subdev]; |
ed9eccbe DS |
1611 | |
1612 | /* load channel/gain list */ | |
c6cd0eef HS |
1613 | ret = __comedi_get_user_chanlist(dev, s, user_chanlist, &cmd); |
1614 | if (ret) | |
1615 | return ret; | |
ed9eccbe | 1616 | |
f8348677 | 1617 | ret = s->do_cmdtest(dev, s, &cmd); |
ed9eccbe | 1618 | |
476b8477 | 1619 | /* restore chanlist pointer before copying back */ |
95bc359f | 1620 | cmd.chanlist = (unsigned int __force *)user_chanlist; |
ed9eccbe | 1621 | |
bc252fd1 | 1622 | if (copy_to_user(arg, &cmd, sizeof(cmd))) { |
272850f0 | 1623 | dev_dbg(dev->class_dev, "bad cmd address\n"); |
ed9eccbe | 1624 | ret = -EFAULT; |
ed9eccbe | 1625 | } |
c6cd0eef | 1626 | |
ed9eccbe DS |
1627 | return ret; |
1628 | } | |
1629 | ||
1630 | /* | |
1631 | COMEDI_LOCK | |
1632 | lock subdevice | |
1633 | ||
1634 | arg: | |
1635 | subdevice number | |
1636 | ||
1637 | reads: | |
1638 | none | |
1639 | ||
1640 | writes: | |
1641 | none | |
1642 | ||
1643 | */ | |
1644 | ||
0a85b6f0 MT |
1645 | static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg, |
1646 | void *file) | |
ed9eccbe DS |
1647 | { |
1648 | int ret = 0; | |
1649 | unsigned long flags; | |
34c43922 | 1650 | struct comedi_subdevice *s; |
ed9eccbe DS |
1651 | |
1652 | if (arg >= dev->n_subdevices) | |
1653 | return -EINVAL; | |
b077f2cd | 1654 | s = &dev->subdevices[arg]; |
ed9eccbe | 1655 | |
5f74ea14 | 1656 | spin_lock_irqsave(&s->spin_lock, flags); |
476b8477 | 1657 | if (s->busy || s->lock) |
ed9eccbe | 1658 | ret = -EBUSY; |
476b8477 | 1659 | else |
ed9eccbe | 1660 | s->lock = file; |
5f74ea14 | 1661 | spin_unlock_irqrestore(&s->spin_lock, flags); |
ed9eccbe | 1662 | |
ed9eccbe DS |
1663 | return ret; |
1664 | } | |
1665 | ||
1666 | /* | |
1667 | COMEDI_UNLOCK | |
1668 | unlock subdevice | |
1669 | ||
1670 | arg: | |
1671 | subdevice number | |
1672 | ||
1673 | reads: | |
1674 | none | |
1675 | ||
1676 | writes: | |
1677 | none | |
1678 | ||
1679 | This function isn't protected by the semaphore, since | |
1680 | we already own the lock. | |
1681 | */ | |
0a85b6f0 MT |
1682 | static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg, |
1683 | void *file) | |
ed9eccbe | 1684 | { |
34c43922 | 1685 | struct comedi_subdevice *s; |
ed9eccbe DS |
1686 | |
1687 | if (arg >= dev->n_subdevices) | |
1688 | return -EINVAL; | |
b077f2cd | 1689 | s = &dev->subdevices[arg]; |
ed9eccbe DS |
1690 | |
1691 | if (s->busy) | |
1692 | return -EBUSY; | |
1693 | ||
1694 | if (s->lock && s->lock != file) | |
1695 | return -EACCES; | |
1696 | ||
90ac0764 | 1697 | if (s->lock == file) |
ed9eccbe | 1698 | s->lock = NULL; |
ed9eccbe DS |
1699 | |
1700 | return 0; | |
1701 | } | |
1702 | ||
1703 | /* | |
1704 | COMEDI_CANCEL | |
1705 | cancel acquisition ioctl | |
1706 | ||
1707 | arg: | |
1708 | subdevice number | |
1709 | ||
1710 | reads: | |
1711 | nothing | |
1712 | ||
1713 | writes: | |
1714 | nothing | |
1715 | ||
1716 | */ | |
0a85b6f0 MT |
1717 | static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg, |
1718 | void *file) | |
ed9eccbe | 1719 | { |
34c43922 | 1720 | struct comedi_subdevice *s; |
69acbaac | 1721 | int ret; |
ed9eccbe DS |
1722 | |
1723 | if (arg >= dev->n_subdevices) | |
1724 | return -EINVAL; | |
b077f2cd | 1725 | s = &dev->subdevices[arg]; |
ed9eccbe DS |
1726 | if (s->async == NULL) |
1727 | return -EINVAL; | |
1728 | ||
ed9eccbe DS |
1729 | if (!s->busy) |
1730 | return 0; | |
1731 | ||
1732 | if (s->busy != file) | |
1733 | return -EBUSY; | |
1734 | ||
69acbaac | 1735 | ret = do_cancel(dev, s); |
69acbaac IA |
1736 | |
1737 | return ret; | |
ed9eccbe DS |
1738 | } |
1739 | ||
1740 | /* | |
1741 | COMEDI_POLL ioctl | |
1742 | instructs driver to synchronize buffers | |
1743 | ||
1744 | arg: | |
1745 | subdevice number | |
1746 | ||
1747 | reads: | |
1748 | nothing | |
1749 | ||
1750 | writes: | |
1751 | nothing | |
1752 | ||
1753 | */ | |
0a85b6f0 MT |
1754 | static int do_poll_ioctl(struct comedi_device *dev, unsigned int arg, |
1755 | void *file) | |
ed9eccbe | 1756 | { |
34c43922 | 1757 | struct comedi_subdevice *s; |
ed9eccbe DS |
1758 | |
1759 | if (arg >= dev->n_subdevices) | |
1760 | return -EINVAL; | |
b077f2cd | 1761 | s = &dev->subdevices[arg]; |
ed9eccbe | 1762 | |
ed9eccbe DS |
1763 | if (!s->busy) |
1764 | return 0; | |
1765 | ||
1766 | if (s->busy != file) | |
1767 | return -EBUSY; | |
1768 | ||
1769 | if (s->poll) | |
1770 | return s->poll(dev, s); | |
1771 | ||
1772 | return -EINVAL; | |
1773 | } | |
1774 | ||
47db6d58 HS |
1775 | static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd, |
1776 | unsigned long arg) | |
1777 | { | |
6131ffaa | 1778 | const unsigned minor = iminor(file_inode(file)); |
e5d670dc | 1779 | struct comedi_device *dev = file->private_data; |
47db6d58 HS |
1780 | int rc; |
1781 | ||
47db6d58 HS |
1782 | mutex_lock(&dev->mutex); |
1783 | ||
1784 | /* Device config is special, because it must work on | |
1785 | * an unconfigured device. */ | |
1786 | if (cmd == COMEDI_DEVCONFIG) { | |
754ab5c0 IA |
1787 | if (minor >= COMEDI_NUM_BOARD_MINORS) { |
1788 | /* Device config not appropriate on non-board minors. */ | |
1789 | rc = -ENOTTY; | |
1790 | goto done; | |
1791 | } | |
47db6d58 HS |
1792 | rc = do_devconfig_ioctl(dev, |
1793 | (struct comedi_devconfig __user *)arg); | |
8ab4ed6e IA |
1794 | if (rc == 0) { |
1795 | if (arg == 0 && | |
1796 | dev->minor >= comedi_num_legacy_minors) { | |
1797 | /* Successfully unconfigured a dynamically | |
1798 | * allocated device. Try and remove it. */ | |
db210da2 | 1799 | if (comedi_clear_board_dev(dev)) { |
8ab4ed6e | 1800 | mutex_unlock(&dev->mutex); |
cb6b79de | 1801 | comedi_free_board_dev(dev); |
8ab4ed6e IA |
1802 | return rc; |
1803 | } | |
1804 | } | |
1805 | } | |
47db6d58 HS |
1806 | goto done; |
1807 | } | |
1808 | ||
1809 | if (!dev->attached) { | |
272850f0 | 1810 | dev_dbg(dev->class_dev, "no driver attached\n"); |
47db6d58 HS |
1811 | rc = -ENODEV; |
1812 | goto done; | |
1813 | } | |
1814 | ||
1815 | switch (cmd) { | |
1816 | case COMEDI_BUFCONFIG: | |
1817 | rc = do_bufconfig_ioctl(dev, | |
1818 | (struct comedi_bufconfig __user *)arg); | |
1819 | break; | |
1820 | case COMEDI_DEVINFO: | |
1821 | rc = do_devinfo_ioctl(dev, (struct comedi_devinfo __user *)arg, | |
1822 | file); | |
1823 | break; | |
1824 | case COMEDI_SUBDINFO: | |
1825 | rc = do_subdinfo_ioctl(dev, | |
1826 | (struct comedi_subdinfo __user *)arg, | |
1827 | file); | |
1828 | break; | |
1829 | case COMEDI_CHANINFO: | |
1830 | rc = do_chaninfo_ioctl(dev, (void __user *)arg); | |
1831 | break; | |
1832 | case COMEDI_RANGEINFO: | |
1833 | rc = do_rangeinfo_ioctl(dev, (void __user *)arg); | |
1834 | break; | |
1835 | case COMEDI_BUFINFO: | |
1836 | rc = do_bufinfo_ioctl(dev, | |
1837 | (struct comedi_bufinfo __user *)arg, | |
1838 | file); | |
1839 | break; | |
1840 | case COMEDI_LOCK: | |
1841 | rc = do_lock_ioctl(dev, arg, file); | |
1842 | break; | |
1843 | case COMEDI_UNLOCK: | |
1844 | rc = do_unlock_ioctl(dev, arg, file); | |
1845 | break; | |
1846 | case COMEDI_CANCEL: | |
1847 | rc = do_cancel_ioctl(dev, arg, file); | |
1848 | break; | |
1849 | case COMEDI_CMD: | |
1850 | rc = do_cmd_ioctl(dev, (struct comedi_cmd __user *)arg, file); | |
1851 | break; | |
1852 | case COMEDI_CMDTEST: | |
1853 | rc = do_cmdtest_ioctl(dev, (struct comedi_cmd __user *)arg, | |
1854 | file); | |
1855 | break; | |
1856 | case COMEDI_INSNLIST: | |
1857 | rc = do_insnlist_ioctl(dev, | |
1858 | (struct comedi_insnlist __user *)arg, | |
1859 | file); | |
1860 | break; | |
1861 | case COMEDI_INSN: | |
1862 | rc = do_insn_ioctl(dev, (struct comedi_insn __user *)arg, | |
1863 | file); | |
1864 | break; | |
1865 | case COMEDI_POLL: | |
1866 | rc = do_poll_ioctl(dev, arg, file); | |
1867 | break; | |
1868 | default: | |
1869 | rc = -ENOTTY; | |
1870 | break; | |
1871 | } | |
1872 | ||
1873 | done: | |
1874 | mutex_unlock(&dev->mutex); | |
1875 | return rc; | |
1876 | } | |
1877 | ||
df30b21c FV |
1878 | static void comedi_vm_open(struct vm_area_struct *area) |
1879 | { | |
af93da31 | 1880 | struct comedi_buf_map *bm; |
df30b21c | 1881 | |
af93da31 IA |
1882 | bm = area->vm_private_data; |
1883 | comedi_buf_map_get(bm); | |
df30b21c FV |
1884 | } |
1885 | ||
1886 | static void comedi_vm_close(struct vm_area_struct *area) | |
ed9eccbe | 1887 | { |
af93da31 | 1888 | struct comedi_buf_map *bm; |
ed9eccbe | 1889 | |
af93da31 IA |
1890 | bm = area->vm_private_data; |
1891 | comedi_buf_map_put(bm); | |
ed9eccbe DS |
1892 | } |
1893 | ||
1894 | static struct vm_operations_struct comedi_vm_ops = { | |
df30b21c FV |
1895 | .open = comedi_vm_open, |
1896 | .close = comedi_vm_close, | |
ed9eccbe DS |
1897 | }; |
1898 | ||
1899 | static int comedi_mmap(struct file *file, struct vm_area_struct *vma) | |
1900 | { | |
6131ffaa | 1901 | const unsigned minor = iminor(file_inode(file)); |
e5d670dc | 1902 | struct comedi_device *dev = file->private_data; |
a52840a9 HS |
1903 | struct comedi_subdevice *s; |
1904 | struct comedi_async *async; | |
b34aa86f | 1905 | struct comedi_buf_map *bm = NULL; |
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 | |
b34aa86f IA |
1912 | /* |
1913 | * 'trylock' avoids circular dependency with current->mm->mmap_sem | |
1914 | * and down-reading &dev->attach_lock should normally succeed without | |
1915 | * contention unless the device is in the process of being attached | |
1916 | * or detached. | |
1917 | */ | |
1918 | if (!down_read_trylock(&dev->attach_lock)) | |
1919 | return -EAGAIN; | |
a52840a9 | 1920 | |
ed9eccbe | 1921 | if (!dev->attached) { |
272850f0 | 1922 | dev_dbg(dev->class_dev, "no driver attached\n"); |
ed9eccbe DS |
1923 | retval = -ENODEV; |
1924 | goto done; | |
1925 | } | |
a52840a9 | 1926 | |
476b8477 | 1927 | if (vma->vm_flags & VM_WRITE) |
da56fdc6 | 1928 | s = comedi_write_subdevice(dev, minor); |
476b8477 | 1929 | else |
da56fdc6 | 1930 | s = comedi_read_subdevice(dev, minor); |
a52840a9 | 1931 | if (!s) { |
ed9eccbe DS |
1932 | retval = -EINVAL; |
1933 | goto done; | |
1934 | } | |
a52840a9 | 1935 | |
ed9eccbe | 1936 | async = s->async; |
a52840a9 | 1937 | if (!async) { |
ed9eccbe DS |
1938 | retval = -EINVAL; |
1939 | goto done; | |
1940 | } | |
1941 | ||
1942 | if (vma->vm_pgoff != 0) { | |
272850f0 | 1943 | dev_dbg(dev->class_dev, "mmap() offset must be 0.\n"); |
ed9eccbe DS |
1944 | retval = -EINVAL; |
1945 | goto done; | |
1946 | } | |
1947 | ||
1948 | size = vma->vm_end - vma->vm_start; | |
1949 | if (size > async->prealloc_bufsz) { | |
1950 | retval = -EFAULT; | |
1951 | goto done; | |
1952 | } | |
1953 | if (size & (~PAGE_MASK)) { | |
1954 | retval = -EFAULT; | |
1955 | goto done; | |
1956 | } | |
1957 | ||
1958 | n_pages = size >> PAGE_SHIFT; | |
b34aa86f IA |
1959 | |
1960 | /* get reference to current buf map (if any) */ | |
1961 | bm = comedi_buf_map_from_subdev_get(s); | |
af93da31 IA |
1962 | if (!bm || n_pages > bm->n_pages) { |
1963 | retval = -EINVAL; | |
1964 | goto done; | |
1965 | } | |
ed9eccbe | 1966 | for (i = 0; i < n_pages; ++i) { |
af93da31 | 1967 | struct comedi_buf_page *buf = &bm->page_list[i]; |
a52840a9 | 1968 | |
ed9eccbe | 1969 | if (remap_pfn_range(vma, start, |
a52840a9 HS |
1970 | page_to_pfn(virt_to_page(buf->virt_addr)), |
1971 | PAGE_SIZE, PAGE_SHARED)) { | |
ed9eccbe DS |
1972 | retval = -EAGAIN; |
1973 | goto done; | |
1974 | } | |
1975 | start += PAGE_SIZE; | |
1976 | } | |
1977 | ||
1978 | vma->vm_ops = &comedi_vm_ops; | |
af93da31 | 1979 | vma->vm_private_data = bm; |
ed9eccbe | 1980 | |
af93da31 | 1981 | vma->vm_ops->open(vma); |
ed9eccbe DS |
1982 | |
1983 | retval = 0; | |
476b8477 | 1984 | done: |
b34aa86f IA |
1985 | up_read(&dev->attach_lock); |
1986 | comedi_buf_map_put(bm); /* put reference to buf map - okay if NULL */ | |
ed9eccbe DS |
1987 | return retval; |
1988 | } | |
1989 | ||
1ae5062a | 1990 | static unsigned int comedi_poll(struct file *file, poll_table *wait) |
ed9eccbe DS |
1991 | { |
1992 | unsigned int mask = 0; | |
6131ffaa | 1993 | const unsigned minor = iminor(file_inode(file)); |
e5d670dc | 1994 | struct comedi_device *dev = file->private_data; |
ca081b1d | 1995 | struct comedi_subdevice *s; |
3ffab428 | 1996 | |
ed9eccbe | 1997 | mutex_lock(&dev->mutex); |
ca081b1d | 1998 | |
ed9eccbe | 1999 | if (!dev->attached) { |
272850f0 | 2000 | dev_dbg(dev->class_dev, "no driver attached\n"); |
ca081b1d | 2001 | goto done; |
ed9eccbe DS |
2002 | } |
2003 | ||
da56fdc6 | 2004 | s = comedi_read_subdevice(dev, minor); |
cc400e18 | 2005 | if (s && s->async) { |
ca081b1d | 2006 | poll_wait(file, &s->async->wait_head, wait); |
f0124630 | 2007 | if (!s->busy || !comedi_is_subdevice_running(s) || |
e9edef3a | 2008 | comedi_buf_read_n_available(s) > 0) |
ed9eccbe | 2009 | mask |= POLLIN | POLLRDNORM; |
ed9eccbe | 2010 | } |
ca081b1d | 2011 | |
da56fdc6 | 2012 | s = comedi_write_subdevice(dev, minor); |
cc400e18 | 2013 | if (s && s->async) { |
0ce016d0 | 2014 | unsigned int bps = bytes_per_sample(s); |
ca081b1d HS |
2015 | |
2016 | poll_wait(file, &s->async->wait_head, wait); | |
24e894bb | 2017 | comedi_buf_write_alloc(s, s->async->prealloc_bufsz); |
f0124630 | 2018 | if (!s->busy || !comedi_is_subdevice_running(s) || |
0f1f34e8 | 2019 | comedi_buf_write_n_allocated(s) >= bps) |
ed9eccbe | 2020 | mask |= POLLOUT | POLLWRNORM; |
ed9eccbe DS |
2021 | } |
2022 | ||
ca081b1d | 2023 | done: |
ed9eccbe DS |
2024 | mutex_unlock(&dev->mutex); |
2025 | return mask; | |
2026 | } | |
2027 | ||
92d0127c GKH |
2028 | static ssize_t comedi_write(struct file *file, const char __user *buf, |
2029 | size_t nbytes, loff_t *offset) | |
ed9eccbe | 2030 | { |
34c43922 | 2031 | struct comedi_subdevice *s; |
d163679c | 2032 | struct comedi_async *async; |
ed9eccbe DS |
2033 | int n, m, count = 0, retval = 0; |
2034 | DECLARE_WAITQUEUE(wait, current); | |
6131ffaa | 2035 | const unsigned minor = iminor(file_inode(file)); |
e5d670dc | 2036 | struct comedi_device *dev = file->private_data; |
9329f139 IA |
2037 | bool on_wait_queue = false; |
2038 | bool attach_locked; | |
2039 | unsigned int old_detach_count; | |
3ffab428 | 2040 | |
9329f139 IA |
2041 | /* Protect against device detachment during operation. */ |
2042 | down_read(&dev->attach_lock); | |
2043 | attach_locked = true; | |
2044 | old_detach_count = dev->detach_count; | |
2045 | ||
ed9eccbe | 2046 | if (!dev->attached) { |
272850f0 | 2047 | dev_dbg(dev->class_dev, "no driver attached\n"); |
9329f139 IA |
2048 | retval = -ENODEV; |
2049 | goto out; | |
ed9eccbe DS |
2050 | } |
2051 | ||
da56fdc6 | 2052 | s = comedi_write_subdevice(dev, minor); |
9329f139 IA |
2053 | if (!s || !s->async) { |
2054 | retval = -EIO; | |
2055 | goto out; | |
2056 | } | |
2714b019 | 2057 | |
ed9eccbe DS |
2058 | async = s->async; |
2059 | ||
2714b019 | 2060 | if (!s->busy || !nbytes) |
9329f139 IA |
2061 | goto out; |
2062 | if (s->busy != file) { | |
2063 | retval = -EACCES; | |
2064 | goto out; | |
2065 | } | |
2714b019 | 2066 | |
ed9eccbe | 2067 | add_wait_queue(&async->wait_head, &wait); |
9329f139 | 2068 | on_wait_queue = true; |
ed9eccbe DS |
2069 | while (nbytes > 0 && !retval) { |
2070 | set_current_state(TASK_INTERRUPTIBLE); | |
2071 | ||
f0124630 | 2072 | if (!comedi_is_subdevice_running(s)) { |
d2611540 | 2073 | if (count == 0) { |
9329f139 IA |
2074 | struct comedi_subdevice *new_s; |
2075 | ||
c098c21a | 2076 | if (comedi_is_subdevice_in_error(s)) |
d2611540 | 2077 | retval = -EPIPE; |
c098c21a | 2078 | else |
d2611540 | 2079 | retval = 0; |
9329f139 IA |
2080 | /* |
2081 | * To avoid deadlock, cannot acquire dev->mutex | |
2082 | * while dev->attach_lock is held. Need to | |
2083 | * remove task from the async wait queue before | |
2084 | * releasing dev->attach_lock, as it might not | |
2085 | * be valid afterwards. | |
2086 | */ | |
2087 | remove_wait_queue(&async->wait_head, &wait); | |
2088 | on_wait_queue = false; | |
2089 | up_read(&dev->attach_lock); | |
2090 | attach_locked = false; | |
2091 | mutex_lock(&dev->mutex); | |
2092 | /* | |
2093 | * Become non-busy unless things have changed | |
2094 | * behind our back. Checking dev->detach_count | |
2095 | * is unchanged ought to be sufficient (unless | |
2096 | * there have been 2**32 detaches in the | |
2097 | * meantime!), but check the subdevice pointer | |
2098 | * as well just in case. | |
2099 | */ | |
2100 | new_s = comedi_write_subdevice(dev, minor); | |
2101 | if (dev->attached && | |
2102 | old_detach_count == dev->detach_count && | |
2103 | s == new_s && new_s->async == async) | |
2104 | do_become_nonbusy(dev, s); | |
4b18f08b | 2105 | mutex_unlock(&dev->mutex); |
d2611540 IA |
2106 | } |
2107 | break; | |
2108 | } | |
2109 | ||
ed9eccbe DS |
2110 | n = nbytes; |
2111 | ||
2112 | m = n; | |
476b8477 | 2113 | if (async->buf_write_ptr + m > async->prealloc_bufsz) |
ed9eccbe | 2114 | m = async->prealloc_bufsz - async->buf_write_ptr; |
24e894bb | 2115 | comedi_buf_write_alloc(s, async->prealloc_bufsz); |
0f1f34e8 IA |
2116 | if (m > comedi_buf_write_n_allocated(s)) |
2117 | m = comedi_buf_write_n_allocated(s); | |
ed9eccbe DS |
2118 | if (m < n) |
2119 | n = m; | |
2120 | ||
2121 | if (n == 0) { | |
ed9eccbe DS |
2122 | if (file->f_flags & O_NONBLOCK) { |
2123 | retval = -EAGAIN; | |
2124 | break; | |
2125 | } | |
6a9ce6b6 | 2126 | schedule(); |
ed9eccbe DS |
2127 | if (signal_pending(current)) { |
2128 | retval = -ERESTARTSYS; | |
2129 | break; | |
2130 | } | |
476b8477 | 2131 | if (!s->busy) |
ed9eccbe | 2132 | break; |
ed9eccbe DS |
2133 | if (s->busy != file) { |
2134 | retval = -EACCES; | |
2135 | break; | |
2136 | } | |
2137 | continue; | |
2138 | } | |
2139 | ||
2140 | m = copy_from_user(async->prealloc_buf + async->buf_write_ptr, | |
476b8477 | 2141 | buf, n); |
ed9eccbe DS |
2142 | if (m) { |
2143 | n -= m; | |
2144 | retval = -EFAULT; | |
2145 | } | |
940dd35d | 2146 | comedi_buf_write_free(s, n); |
ed9eccbe DS |
2147 | |
2148 | count += n; | |
2149 | nbytes -= n; | |
2150 | ||
2151 | buf += n; | |
2152 | break; /* makes device work like a pipe */ | |
2153 | } | |
9329f139 IA |
2154 | out: |
2155 | if (on_wait_queue) | |
2156 | remove_wait_queue(&async->wait_head, &wait); | |
ed9eccbe | 2157 | set_current_state(TASK_RUNNING); |
9329f139 IA |
2158 | if (attach_locked) |
2159 | up_read(&dev->attach_lock); | |
ed9eccbe | 2160 | |
476b8477 | 2161 | return count ? count : retval; |
ed9eccbe DS |
2162 | } |
2163 | ||
92d0127c | 2164 | static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes, |
36efbacd | 2165 | loff_t *offset) |
ed9eccbe | 2166 | { |
34c43922 | 2167 | struct comedi_subdevice *s; |
d163679c | 2168 | struct comedi_async *async; |
ed9eccbe DS |
2169 | int n, m, count = 0, retval = 0; |
2170 | DECLARE_WAITQUEUE(wait, current); | |
6131ffaa | 2171 | const unsigned minor = iminor(file_inode(file)); |
e5d670dc | 2172 | struct comedi_device *dev = file->private_data; |
45c2bc55 IA |
2173 | unsigned int old_detach_count; |
2174 | bool become_nonbusy = false; | |
2175 | bool attach_locked; | |
3ffab428 | 2176 | |
45c2bc55 IA |
2177 | /* Protect against device detachment during operation. */ |
2178 | down_read(&dev->attach_lock); | |
2179 | attach_locked = true; | |
2180 | old_detach_count = dev->detach_count; | |
2181 | ||
ed9eccbe | 2182 | if (!dev->attached) { |
272850f0 | 2183 | dev_dbg(dev->class_dev, "no driver attached\n"); |
45c2bc55 IA |
2184 | retval = -ENODEV; |
2185 | goto out; | |
ed9eccbe DS |
2186 | } |
2187 | ||
da56fdc6 | 2188 | s = comedi_read_subdevice(dev, minor); |
45c2bc55 IA |
2189 | if (!s || !s->async) { |
2190 | retval = -EIO; | |
2191 | goto out; | |
2192 | } | |
5c87fef5 | 2193 | |
ed9eccbe | 2194 | async = s->async; |
5c87fef5 | 2195 | if (!s->busy || !nbytes) |
45c2bc55 IA |
2196 | goto out; |
2197 | if (s->busy != file) { | |
2198 | retval = -EACCES; | |
2199 | goto out; | |
2200 | } | |
ed9eccbe DS |
2201 | |
2202 | add_wait_queue(&async->wait_head, &wait); | |
2203 | while (nbytes > 0 && !retval) { | |
2204 | set_current_state(TASK_INTERRUPTIBLE); | |
2205 | ||
2206 | n = nbytes; | |
2207 | ||
e9edef3a | 2208 | m = comedi_buf_read_n_available(s); |
476b8477 | 2209 | if (async->buf_read_ptr + m > async->prealloc_bufsz) |
ed9eccbe | 2210 | m = async->prealloc_bufsz - async->buf_read_ptr; |
ed9eccbe DS |
2211 | if (m < n) |
2212 | n = m; | |
2213 | ||
2214 | if (n == 0) { | |
f0124630 | 2215 | if (!comedi_is_subdevice_running(s)) { |
c098c21a | 2216 | if (comedi_is_subdevice_in_error(s)) |
ed9eccbe | 2217 | retval = -EPIPE; |
c098c21a | 2218 | else |
ed9eccbe | 2219 | retval = 0; |
45c2bc55 | 2220 | become_nonbusy = true; |
ed9eccbe DS |
2221 | break; |
2222 | } | |
2223 | if (file->f_flags & O_NONBLOCK) { | |
2224 | retval = -EAGAIN; | |
2225 | break; | |
2226 | } | |
6a9ce6b6 | 2227 | schedule(); |
ed9eccbe DS |
2228 | if (signal_pending(current)) { |
2229 | retval = -ERESTARTSYS; | |
2230 | break; | |
2231 | } | |
ed9eccbe DS |
2232 | if (!s->busy) { |
2233 | retval = 0; | |
2234 | break; | |
2235 | } | |
2236 | if (s->busy != file) { | |
2237 | retval = -EACCES; | |
2238 | break; | |
2239 | } | |
2240 | continue; | |
2241 | } | |
2242 | m = copy_to_user(buf, async->prealloc_buf + | |
476b8477 | 2243 | async->buf_read_ptr, n); |
ed9eccbe DS |
2244 | if (m) { |
2245 | n -= m; | |
2246 | retval = -EFAULT; | |
2247 | } | |
2248 | ||
d13be55a | 2249 | comedi_buf_read_alloc(s, n); |
f1df8662 | 2250 | comedi_buf_read_free(s, n); |
ed9eccbe DS |
2251 | |
2252 | count += n; | |
2253 | nbytes -= n; | |
2254 | ||
2255 | buf += n; | |
2256 | break; /* makes device work like a pipe */ | |
2257 | } | |
45c2bc55 IA |
2258 | remove_wait_queue(&async->wait_head, &wait); |
2259 | set_current_state(TASK_RUNNING); | |
2260 | if (become_nonbusy || comedi_is_subdevice_idle(s)) { | |
2261 | struct comedi_subdevice *new_s; | |
2262 | ||
2263 | /* | |
2264 | * To avoid deadlock, cannot acquire dev->mutex | |
2265 | * while dev->attach_lock is held. | |
2266 | */ | |
2267 | up_read(&dev->attach_lock); | |
2268 | attach_locked = false; | |
4b18f08b | 2269 | mutex_lock(&dev->mutex); |
45c2bc55 IA |
2270 | /* |
2271 | * Check device hasn't become detached behind our back. | |
2272 | * Checking dev->detach_count is unchanged ought to be | |
2273 | * sufficient (unless there have been 2**32 detaches in the | |
2274 | * meantime!), but check the subdevice pointer as well just in | |
2275 | * case. | |
2276 | */ | |
2277 | new_s = comedi_read_subdevice(dev, minor); | |
2278 | if (dev->attached && old_detach_count == dev->detach_count && | |
2279 | s == new_s && new_s->async == async) { | |
f4f3f7cf | 2280 | if (become_nonbusy || comedi_buf_n_bytes_ready(s) == 0) |
45c2bc55 IA |
2281 | do_become_nonbusy(dev, s); |
2282 | } | |
4b18f08b | 2283 | mutex_unlock(&dev->mutex); |
ed9eccbe | 2284 | } |
45c2bc55 IA |
2285 | out: |
2286 | if (attach_locked) | |
2287 | up_read(&dev->attach_lock); | |
ed9eccbe | 2288 | |
476b8477 | 2289 | return count ? count : retval; |
ed9eccbe DS |
2290 | } |
2291 | ||
ed9eccbe DS |
2292 | static int comedi_open(struct inode *inode, struct file *file) |
2293 | { | |
ed9eccbe | 2294 | const unsigned minor = iminor(inode); |
fc406986 IA |
2295 | struct comedi_device *dev = comedi_dev_get_from_minor(minor); |
2296 | int rc; | |
97920071 | 2297 | |
4da5fa9a | 2298 | if (!dev) { |
272850f0 | 2299 | pr_debug("invalid minor number\n"); |
ed9eccbe DS |
2300 | return -ENODEV; |
2301 | } | |
2302 | ||
ed9eccbe | 2303 | mutex_lock(&dev->mutex); |
a8f80e8f | 2304 | if (!dev->attached && !capable(CAP_NET_ADMIN)) { |
272850f0 | 2305 | dev_dbg(dev->class_dev, "not attached and not CAP_NET_ADMIN\n"); |
fc406986 IA |
2306 | rc = -ENODEV; |
2307 | goto out; | |
ed9eccbe | 2308 | } |
1363e4fb | 2309 | if (dev->attached && dev->use_count == 0) { |
ed9eccbe | 2310 | if (!try_module_get(dev->driver->module)) { |
fc406986 IA |
2311 | rc = -ENOSYS; |
2312 | goto out; | |
ed9eccbe | 2313 | } |
1363e4fb IA |
2314 | if (dev->open) { |
2315 | rc = dev->open(dev); | |
2316 | if (rc < 0) { | |
2317 | module_put(dev->driver->module); | |
2318 | goto out; | |
2319 | } | |
3c17ba07 IA |
2320 | } |
2321 | } | |
ed9eccbe DS |
2322 | |
2323 | dev->use_count++; | |
e5d670dc | 2324 | file->private_data = dev; |
fc406986 | 2325 | rc = 0; |
ed9eccbe | 2326 | |
fc406986 | 2327 | out: |
a5011a26 | 2328 | mutex_unlock(&dev->mutex); |
fc406986 IA |
2329 | if (rc) |
2330 | comedi_dev_put(dev); | |
2331 | return rc; | |
ed9eccbe DS |
2332 | } |
2333 | ||
2aae0076 HS |
2334 | static int comedi_fasync(int fd, struct file *file, int on) |
2335 | { | |
e5d670dc | 2336 | struct comedi_device *dev = file->private_data; |
2aae0076 HS |
2337 | |
2338 | return fasync_helper(fd, file, on, &dev->async_queue); | |
2339 | } | |
2340 | ||
a5011a26 | 2341 | static int comedi_close(struct inode *inode, struct file *file) |
ed9eccbe | 2342 | { |
e5d670dc | 2343 | struct comedi_device *dev = file->private_data; |
a5011a26 | 2344 | struct comedi_subdevice *s = NULL; |
ed9eccbe DS |
2345 | int i; |
2346 | ||
a5011a26 HS |
2347 | mutex_lock(&dev->mutex); |
2348 | ||
2349 | if (dev->subdevices) { | |
2350 | for (i = 0; i < dev->n_subdevices; i++) { | |
b077f2cd | 2351 | s = &dev->subdevices[i]; |
a5011a26 HS |
2352 | |
2353 | if (s->busy == file) | |
2354 | do_cancel(dev, s); | |
2355 | if (s->lock == file) | |
2356 | s->lock = NULL; | |
2357 | } | |
ed9eccbe | 2358 | } |
1363e4fb IA |
2359 | if (dev->attached && dev->use_count == 1) { |
2360 | if (dev->close) | |
2361 | dev->close(dev); | |
a5011a26 | 2362 | module_put(dev->driver->module); |
1363e4fb | 2363 | } |
a5011a26 HS |
2364 | |
2365 | dev->use_count--; | |
2366 | ||
2367 | mutex_unlock(&dev->mutex); | |
fc406986 | 2368 | comedi_dev_put(dev); |
a5011a26 | 2369 | |
ed9eccbe DS |
2370 | return 0; |
2371 | } | |
2372 | ||
8cb8aad7 | 2373 | static const struct file_operations comedi_fops = { |
a5011a26 HS |
2374 | .owner = THIS_MODULE, |
2375 | .unlocked_ioctl = comedi_unlocked_ioctl, | |
2376 | .compat_ioctl = comedi_compat_ioctl, | |
2377 | .open = comedi_open, | |
2378 | .release = comedi_close, | |
2379 | .read = comedi_read, | |
2380 | .write = comedi_write, | |
2381 | .mmap = comedi_mmap, | |
2382 | .poll = comedi_poll, | |
2383 | .fasync = comedi_fasync, | |
2384 | .llseek = noop_llseek, | |
2385 | }; | |
2386 | ||
a5011a26 | 2387 | void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s) |
883db3d9 | 2388 | { |
a5011a26 HS |
2389 | struct comedi_async *async = s->async; |
2390 | unsigned runflags = 0; | |
2391 | unsigned runflags_mask = 0; | |
883db3d9 | 2392 | |
f0124630 | 2393 | if (!comedi_is_subdevice_running(s)) |
a5011a26 HS |
2394 | return; |
2395 | ||
2396 | if (s-> | |
2397 | async->events & (COMEDI_CB_EOA | COMEDI_CB_ERROR | | |
2398 | COMEDI_CB_OVERFLOW)) { | |
2399 | runflags_mask |= SRF_RUNNING; | |
883db3d9 | 2400 | } |
a5011a26 HS |
2401 | /* remember if an error event has occurred, so an error |
2402 | * can be returned the next time the user does a read() */ | |
2403 | if (s->async->events & (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) { | |
2404 | runflags_mask |= SRF_ERROR; | |
2405 | runflags |= SRF_ERROR; | |
883db3d9 | 2406 | } |
a5011a26 HS |
2407 | if (runflags_mask) { |
2408 | /*sets SRF_ERROR and SRF_RUNNING together atomically */ | |
2409 | comedi_set_subdevice_runflags(s, runflags_mask, runflags); | |
883db3d9 FMH |
2410 | } |
2411 | ||
a5011a26 | 2412 | if (async->cb_mask & s->async->events) { |
c265be01 IA |
2413 | wake_up_interruptible(&async->wait_head); |
2414 | if (s->subdev_flags & SDF_CMD_READ) | |
2415 | kill_fasync(&dev->async_queue, SIGIO, POLL_IN); | |
2416 | if (s->subdev_flags & SDF_CMD_WRITE) | |
2417 | kill_fasync(&dev->async_queue, SIGIO, POLL_OUT); | |
a5011a26 HS |
2418 | } |
2419 | s->async->events = 0; | |
883db3d9 | 2420 | } |
5660e742 | 2421 | EXPORT_SYMBOL_GPL(comedi_event); |
883db3d9 | 2422 | |
07778393 | 2423 | /* Note: the ->mutex is pre-locked on successful return */ |
7638ffcb | 2424 | struct comedi_device *comedi_alloc_board_minor(struct device *hardware_device) |
a5011a26 | 2425 | { |
7638ffcb | 2426 | struct comedi_device *dev; |
a5011a26 HS |
2427 | struct device *csdev; |
2428 | unsigned i; | |
a5011a26 | 2429 | |
36efbacd | 2430 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
cb6b79de | 2431 | if (dev == NULL) |
7638ffcb | 2432 | return ERR_PTR(-ENOMEM); |
7638ffcb | 2433 | comedi_device_init(dev); |
db2e3487 | 2434 | comedi_set_hw_dev(dev, hardware_device); |
07778393 | 2435 | mutex_lock(&dev->mutex); |
5b7dba1b | 2436 | mutex_lock(&comedi_board_minor_table_lock); |
38b9722a IA |
2437 | for (i = hardware_device ? comedi_num_legacy_minors : 0; |
2438 | i < COMEDI_NUM_BOARD_MINORS; ++i) { | |
5b7dba1b | 2439 | if (comedi_board_minor_table[i] == NULL) { |
cb6b79de | 2440 | comedi_board_minor_table[i] = dev; |
a5011a26 HS |
2441 | break; |
2442 | } | |
2443 | } | |
5b7dba1b | 2444 | mutex_unlock(&comedi_board_minor_table_lock); |
a5011a26 | 2445 | if (i == COMEDI_NUM_BOARD_MINORS) { |
07778393 | 2446 | mutex_unlock(&dev->mutex); |
7638ffcb | 2447 | comedi_device_cleanup(dev); |
5b13ed94 | 2448 | comedi_dev_put(dev); |
c2ad078b | 2449 | pr_err("ran out of minor numbers for board device files\n"); |
7638ffcb | 2450 | return ERR_PTR(-EBUSY); |
a5011a26 | 2451 | } |
7638ffcb | 2452 | dev->minor = i; |
a5011a26 HS |
2453 | csdev = device_create(comedi_class, hardware_device, |
2454 | MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i", i); | |
2455 | if (!IS_ERR(csdev)) | |
8f988d87 | 2456 | dev->class_dev = get_device(csdev); |
883db3d9 | 2457 | |
07778393 | 2458 | /* Note: dev->mutex needs to be unlocked by the caller. */ |
7638ffcb | 2459 | return dev; |
883db3d9 FMH |
2460 | } |
2461 | ||
70f30c37 | 2462 | static void comedi_free_board_minor(unsigned minor) |
24fb134d IA |
2463 | { |
2464 | BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS); | |
cb6b79de | 2465 | comedi_free_board_dev(comedi_clear_board_minor(minor)); |
24fb134d IA |
2466 | } |
2467 | ||
3346b798 | 2468 | void comedi_release_hardware_device(struct device *hardware_device) |
883db3d9 | 2469 | { |
a5011a26 | 2470 | int minor; |
cb6b79de | 2471 | struct comedi_device *dev; |
883db3d9 | 2472 | |
38b9722a IA |
2473 | for (minor = comedi_num_legacy_minors; minor < COMEDI_NUM_BOARD_MINORS; |
2474 | minor++) { | |
5b7dba1b | 2475 | mutex_lock(&comedi_board_minor_table_lock); |
cb6b79de IA |
2476 | dev = comedi_board_minor_table[minor]; |
2477 | if (dev && dev->hw_dev == hardware_device) { | |
5b7dba1b IA |
2478 | comedi_board_minor_table[minor] = NULL; |
2479 | mutex_unlock(&comedi_board_minor_table_lock); | |
cb6b79de | 2480 | comedi_free_board_dev(dev); |
3346b798 | 2481 | break; |
a5011a26 | 2482 | } |
5b7dba1b | 2483 | mutex_unlock(&comedi_board_minor_table_lock); |
883db3d9 | 2484 | } |
883db3d9 FMH |
2485 | } |
2486 | ||
f65cc544 | 2487 | int comedi_alloc_subdevice_minor(struct comedi_subdevice *s) |
883db3d9 | 2488 | { |
f65cc544 | 2489 | struct comedi_device *dev = s->device; |
a5011a26 HS |
2490 | struct device *csdev; |
2491 | unsigned i; | |
883db3d9 | 2492 | |
5b7dba1b IA |
2493 | mutex_lock(&comedi_subdevice_minor_table_lock); |
2494 | for (i = 0; i < COMEDI_NUM_SUBDEVICE_MINORS; ++i) { | |
2495 | if (comedi_subdevice_minor_table[i] == NULL) { | |
bd5b4173 | 2496 | comedi_subdevice_minor_table[i] = s; |
a5011a26 HS |
2497 | break; |
2498 | } | |
2499 | } | |
5b7dba1b IA |
2500 | mutex_unlock(&comedi_subdevice_minor_table_lock); |
2501 | if (i == COMEDI_NUM_SUBDEVICE_MINORS) { | |
c2ad078b | 2502 | pr_err("ran out of minor numbers for subdevice files\n"); |
a5011a26 HS |
2503 | return -EBUSY; |
2504 | } | |
5b7dba1b | 2505 | i += COMEDI_NUM_BOARD_MINORS; |
a5011a26 HS |
2506 | s->minor = i; |
2507 | csdev = device_create(comedi_class, dev->class_dev, | |
2508 | MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i_subd%i", | |
90a35c15 | 2509 | dev->minor, s->index); |
a5011a26 HS |
2510 | if (!IS_ERR(csdev)) |
2511 | s->class_dev = csdev; | |
883db3d9 | 2512 | |
da718546 | 2513 | return 0; |
883db3d9 FMH |
2514 | } |
2515 | ||
a5011a26 | 2516 | void comedi_free_subdevice_minor(struct comedi_subdevice *s) |
883db3d9 | 2517 | { |
0fcc9d48 | 2518 | unsigned int i; |
883db3d9 | 2519 | |
a5011a26 HS |
2520 | if (s == NULL) |
2521 | return; | |
2522 | if (s->minor < 0) | |
2523 | return; | |
883db3d9 | 2524 | |
a5011a26 | 2525 | BUG_ON(s->minor >= COMEDI_NUM_MINORS); |
8907cf6c | 2526 | BUG_ON(s->minor < COMEDI_NUM_BOARD_MINORS); |
883db3d9 | 2527 | |
0fcc9d48 IA |
2528 | i = s->minor - COMEDI_NUM_BOARD_MINORS; |
2529 | mutex_lock(&comedi_subdevice_minor_table_lock); | |
bd5b4173 IA |
2530 | if (s == comedi_subdevice_minor_table[i]) |
2531 | comedi_subdevice_minor_table[i] = NULL; | |
0fcc9d48 | 2532 | mutex_unlock(&comedi_subdevice_minor_table_lock); |
a5011a26 HS |
2533 | if (s->class_dev) { |
2534 | device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor)); | |
2535 | s->class_dev = NULL; | |
883db3d9 | 2536 | } |
883db3d9 | 2537 | } |
a5787824 | 2538 | |
682b9119 | 2539 | static void comedi_cleanup_board_minors(void) |
76cca89f HS |
2540 | { |
2541 | unsigned i; | |
2542 | ||
682b9119 | 2543 | for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) |
76cca89f HS |
2544 | comedi_free_board_minor(i); |
2545 | } | |
2546 | ||
91fa0b0c HS |
2547 | static int __init comedi_init(void) |
2548 | { | |
2549 | int i; | |
2550 | int retval; | |
2551 | ||
c2ad078b | 2552 | pr_info("version " COMEDI_RELEASE " - http://www.comedi.org\n"); |
91fa0b0c HS |
2553 | |
2554 | if (comedi_num_legacy_minors < 0 || | |
2555 | comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) { | |
c2ad078b | 2556 | pr_err("invalid value for module parameter \"comedi_num_legacy_minors\". Valid values are 0 through %i.\n", |
91fa0b0c HS |
2557 | COMEDI_NUM_BOARD_MINORS); |
2558 | return -EINVAL; | |
2559 | } | |
2560 | ||
91fa0b0c HS |
2561 | retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0), |
2562 | COMEDI_NUM_MINORS, "comedi"); | |
2563 | if (retval) | |
2564 | return -EIO; | |
2565 | cdev_init(&comedi_cdev, &comedi_fops); | |
2566 | comedi_cdev.owner = THIS_MODULE; | |
a5bde3a1 AP |
2567 | |
2568 | retval = kobject_set_name(&comedi_cdev.kobj, "comedi"); | |
2569 | if (retval) { | |
2570 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
2571 | COMEDI_NUM_MINORS); | |
2572 | return retval; | |
2573 | } | |
2574 | ||
91fa0b0c HS |
2575 | if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) { |
2576 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
2577 | COMEDI_NUM_MINORS); | |
2578 | return -EIO; | |
2579 | } | |
2580 | comedi_class = class_create(THIS_MODULE, "comedi"); | |
2581 | if (IS_ERR(comedi_class)) { | |
c2ad078b | 2582 | pr_err("failed to create class\n"); |
91fa0b0c HS |
2583 | cdev_del(&comedi_cdev); |
2584 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
2585 | COMEDI_NUM_MINORS); | |
2586 | return PTR_ERR(comedi_class); | |
2587 | } | |
2588 | ||
e56341ad | 2589 | comedi_class->dev_groups = comedi_dev_groups; |
91fa0b0c HS |
2590 | |
2591 | /* XXX requires /proc interface */ | |
2592 | comedi_proc_init(); | |
2593 | ||
2594 | /* create devices files for legacy/manual use */ | |
2595 | for (i = 0; i < comedi_num_legacy_minors; i++) { | |
7638ffcb | 2596 | struct comedi_device *dev; |
4bac39f6 | 2597 | |
7638ffcb IA |
2598 | dev = comedi_alloc_board_minor(NULL); |
2599 | if (IS_ERR(dev)) { | |
682b9119 | 2600 | comedi_cleanup_board_minors(); |
91fa0b0c HS |
2601 | cdev_del(&comedi_cdev); |
2602 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
2603 | COMEDI_NUM_MINORS); | |
7638ffcb | 2604 | return PTR_ERR(dev); |
91fa0b0c | 2605 | } |
cb3aadae KH |
2606 | /* comedi_alloc_board_minor() locked the mutex */ |
2607 | mutex_unlock(&dev->mutex); | |
91fa0b0c HS |
2608 | } |
2609 | ||
2610 | return 0; | |
2611 | } | |
2612 | module_init(comedi_init); | |
2613 | ||
2614 | static void __exit comedi_cleanup(void) | |
2615 | { | |
2616 | int i; | |
2617 | ||
682b9119 | 2618 | comedi_cleanup_board_minors(); |
5b7dba1b IA |
2619 | for (i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i) |
2620 | BUG_ON(comedi_board_minor_table[i]); | |
2621 | for (i = 0; i < COMEDI_NUM_SUBDEVICE_MINORS; ++i) | |
2622 | BUG_ON(comedi_subdevice_minor_table[i]); | |
91fa0b0c HS |
2623 | |
2624 | class_destroy(comedi_class); | |
2625 | cdev_del(&comedi_cdev); | |
2626 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS); | |
2627 | ||
2628 | comedi_proc_cleanup(); | |
2629 | } | |
2630 | module_exit(comedi_cleanup); | |
2631 | ||
a5787824 HS |
2632 | MODULE_AUTHOR("http://www.comedi.org"); |
2633 | MODULE_DESCRIPTION("Comedi core module"); | |
2634 | MODULE_LICENSE("GPL"); |