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Commit | Line | Data |
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ed9eccbe | 1 | /* |
f6fef5df IA |
2 | * comedi/comedi_fops.c |
3 | * comedi kernel module | |
4 | * | |
5 | * COMEDI - Linux Control and Measurement Device Interface | |
6 | * Copyright (C) 1997-2000 David A. Schleef <ds@schleef.org> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | */ | |
ed9eccbe | 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 | |
20f083c0 IA |
46 | /** |
47 | * struct comedi_file - per-file private data for comedi device | |
48 | * @dev: comedi_device struct | |
49 | * @read_subdev: current "read" subdevice | |
50 | * @write_subdev: current "write" subdevice | |
51 | * @last_detach_count: last known detach count | |
52 | * @last_attached: last known attached/detached state | |
53 | */ | |
54 | struct comedi_file { | |
55 | struct comedi_device *dev; | |
56 | struct comedi_subdevice *read_subdev; | |
57 | struct comedi_subdevice *write_subdev; | |
58 | unsigned int last_detach_count; | |
59 | bool last_attached:1; | |
60 | }; | |
61 | ||
eda56825 | 62 | #define COMEDI_NUM_MINORS 0x100 |
5b7dba1b IA |
63 | #define COMEDI_NUM_SUBDEVICE_MINORS \ |
64 | (COMEDI_NUM_MINORS - COMEDI_NUM_BOARD_MINORS) | |
eda56825 | 65 | |
92d0127c | 66 | static int comedi_num_legacy_minors; |
4d7df821 IA |
67 | module_param(comedi_num_legacy_minors, int, S_IRUGO); |
68 | MODULE_PARM_DESC(comedi_num_legacy_minors, | |
69 | "number of comedi minor devices to reserve for non-auto-configured devices (default 0)" | |
70 | ); | |
71 | ||
234bb3c6 | 72 | unsigned int comedi_default_buf_size_kb = CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB; |
4d7df821 IA |
73 | module_param(comedi_default_buf_size_kb, uint, S_IRUGO | S_IWUSR); |
74 | MODULE_PARM_DESC(comedi_default_buf_size_kb, | |
75 | "default asynchronous buffer size in KiB (default " | |
234bb3c6 | 76 | __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB) ")"); |
4d7df821 | 77 | |
234bb3c6 IA |
78 | unsigned int comedi_default_buf_maxsize_kb |
79 | = CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB; | |
4d7df821 IA |
80 | module_param(comedi_default_buf_maxsize_kb, uint, S_IRUGO | S_IWUSR); |
81 | MODULE_PARM_DESC(comedi_default_buf_maxsize_kb, | |
82 | "default maximum size of asynchronous buffer in KiB (default " | |
234bb3c6 | 83 | __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB) ")"); |
1dd33ab8 | 84 | |
5b7dba1b | 85 | static DEFINE_MUTEX(comedi_board_minor_table_lock); |
cb6b79de | 86 | static struct comedi_device |
5b7dba1b IA |
87 | *comedi_board_minor_table[COMEDI_NUM_BOARD_MINORS]; |
88 | ||
89 | static DEFINE_MUTEX(comedi_subdevice_minor_table_lock); | |
90 | /* Note: indexed by minor - COMEDI_NUM_BOARD_MINORS. */ | |
bd5b4173 | 91 | static struct comedi_subdevice |
5b7dba1b | 92 | *comedi_subdevice_minor_table[COMEDI_NUM_SUBDEVICE_MINORS]; |
476b8477 | 93 | |
d9740a03 IA |
94 | static struct class *comedi_class; |
95 | static struct cdev comedi_cdev; | |
96 | ||
97 | static void comedi_device_init(struct comedi_device *dev) | |
98 | { | |
5b13ed94 | 99 | kref_init(&dev->refcount); |
d9740a03 IA |
100 | spin_lock_init(&dev->spinlock); |
101 | mutex_init(&dev->mutex); | |
2f3fdcd7 | 102 | init_rwsem(&dev->attach_lock); |
d9740a03 IA |
103 | dev->minor = -1; |
104 | } | |
105 | ||
5b13ed94 IA |
106 | static void comedi_dev_kref_release(struct kref *kref) |
107 | { | |
108 | struct comedi_device *dev = | |
109 | container_of(kref, struct comedi_device, refcount); | |
110 | ||
111 | mutex_destroy(&dev->mutex); | |
8f988d87 | 112 | put_device(dev->class_dev); |
5b13ed94 IA |
113 | kfree(dev); |
114 | } | |
115 | ||
dd630cde IA |
116 | /** |
117 | * comedi_dev_put - release a use of a comedi device structure | |
118 | * @dev: comedi_device struct | |
119 | * | |
120 | * Must be called when a user of a comedi device is finished with it. | |
121 | * When the last user of the comedi device calls this function, the | |
122 | * comedi device is destroyed. | |
123 | * | |
124 | * Return 1 if the comedi device is destroyed by this call or dev is | |
125 | * NULL, otherwise return 0. Callers must not assume the comedi | |
126 | * device is still valid if this function returns 0. | |
127 | */ | |
5b13ed94 IA |
128 | int comedi_dev_put(struct comedi_device *dev) |
129 | { | |
130 | if (dev) | |
131 | return kref_put(&dev->refcount, comedi_dev_kref_release); | |
132 | return 1; | |
133 | } | |
b449c1ca IA |
134 | EXPORT_SYMBOL_GPL(comedi_dev_put); |
135 | ||
136 | static struct comedi_device *comedi_dev_get(struct comedi_device *dev) | |
137 | { | |
138 | if (dev) | |
139 | kref_get(&dev->refcount); | |
140 | return dev; | |
141 | } | |
5b13ed94 | 142 | |
d9740a03 IA |
143 | static void comedi_device_cleanup(struct comedi_device *dev) |
144 | { | |
145 | struct module *driver_module = NULL; | |
146 | ||
147 | if (dev == NULL) | |
148 | return; | |
149 | mutex_lock(&dev->mutex); | |
150 | if (dev->attached) | |
151 | driver_module = dev->driver->module; | |
152 | comedi_device_detach(dev); | |
1363e4fb IA |
153 | if (driver_module && dev->use_count) |
154 | module_put(driver_module); | |
d9740a03 | 155 | mutex_unlock(&dev->mutex); |
d9740a03 IA |
156 | } |
157 | ||
db210da2 IA |
158 | static bool comedi_clear_board_dev(struct comedi_device *dev) |
159 | { | |
160 | unsigned int i = dev->minor; | |
161 | bool cleared = false; | |
162 | ||
163 | mutex_lock(&comedi_board_minor_table_lock); | |
164 | if (dev == comedi_board_minor_table[i]) { | |
165 | comedi_board_minor_table[i] = NULL; | |
166 | cleared = true; | |
167 | } | |
168 | mutex_unlock(&comedi_board_minor_table_lock); | |
169 | return cleared; | |
170 | } | |
171 | ||
cb6b79de | 172 | static struct comedi_device *comedi_clear_board_minor(unsigned minor) |
d9740a03 | 173 | { |
cb6b79de | 174 | struct comedi_device *dev; |
d9740a03 | 175 | |
5b7dba1b | 176 | mutex_lock(&comedi_board_minor_table_lock); |
cb6b79de | 177 | dev = comedi_board_minor_table[minor]; |
5b7dba1b IA |
178 | comedi_board_minor_table[minor] = NULL; |
179 | mutex_unlock(&comedi_board_minor_table_lock); | |
cb6b79de | 180 | return dev; |
d9740a03 IA |
181 | } |
182 | ||
cb6b79de | 183 | static void comedi_free_board_dev(struct comedi_device *dev) |
d9740a03 | 184 | { |
cb6b79de | 185 | if (dev) { |
52ef9e7c | 186 | comedi_device_cleanup(dev); |
cb6b79de IA |
187 | if (dev->class_dev) { |
188 | device_destroy(comedi_class, | |
189 | MKDEV(COMEDI_MAJOR, dev->minor)); | |
d9740a03 | 190 | } |
5b13ed94 | 191 | comedi_dev_put(dev); |
d9740a03 IA |
192 | } |
193 | } | |
8ab4ed6e | 194 | |
bd5b4173 | 195 | static struct comedi_subdevice |
63ab0395 | 196 | *comedi_subdevice_from_minor(const struct comedi_device *dev, unsigned minor) |
5b7dba1b | 197 | { |
bd5b4173 | 198 | struct comedi_subdevice *s; |
5b7dba1b IA |
199 | unsigned int i = minor - COMEDI_NUM_BOARD_MINORS; |
200 | ||
201 | BUG_ON(i >= COMEDI_NUM_SUBDEVICE_MINORS); | |
202 | mutex_lock(&comedi_subdevice_minor_table_lock); | |
bd5b4173 | 203 | s = comedi_subdevice_minor_table[i]; |
63ab0395 IA |
204 | if (s && s->device != dev) |
205 | s = NULL; | |
5b7dba1b | 206 | mutex_unlock(&comedi_subdevice_minor_table_lock); |
bd5b4173 | 207 | return s; |
5b7dba1b IA |
208 | } |
209 | ||
b449c1ca IA |
210 | static struct comedi_device *comedi_dev_get_from_board_minor(unsigned minor) |
211 | { | |
212 | struct comedi_device *dev; | |
213 | ||
214 | BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS); | |
215 | mutex_lock(&comedi_board_minor_table_lock); | |
216 | dev = comedi_dev_get(comedi_board_minor_table[minor]); | |
217 | mutex_unlock(&comedi_board_minor_table_lock); | |
218 | return dev; | |
219 | } | |
220 | ||
221 | static struct comedi_device *comedi_dev_get_from_subdevice_minor(unsigned minor) | |
222 | { | |
223 | struct comedi_device *dev; | |
224 | struct comedi_subdevice *s; | |
225 | unsigned int i = minor - COMEDI_NUM_BOARD_MINORS; | |
226 | ||
227 | BUG_ON(i >= COMEDI_NUM_SUBDEVICE_MINORS); | |
228 | mutex_lock(&comedi_subdevice_minor_table_lock); | |
229 | s = comedi_subdevice_minor_table[i]; | |
230 | dev = comedi_dev_get(s ? s->device : NULL); | |
231 | mutex_unlock(&comedi_subdevice_minor_table_lock); | |
232 | return dev; | |
233 | } | |
234 | ||
dd630cde IA |
235 | /** |
236 | * comedi_dev_get_from_minor - get comedi device by minor device number | |
237 | * @minor: minor device number | |
238 | * | |
239 | * Finds the comedi device associated by the minor device number, if any, | |
240 | * and increments its reference count. The comedi device is prevented from | |
241 | * being freed until a matching call is made to comedi_dev_put(). | |
242 | * | |
243 | * Return a pointer to the comedi device if it exists, with its usage | |
244 | * reference incremented. Return NULL if no comedi device exists with the | |
245 | * specified minor device number. | |
246 | */ | |
b449c1ca IA |
247 | struct comedi_device *comedi_dev_get_from_minor(unsigned minor) |
248 | { | |
249 | if (minor < COMEDI_NUM_BOARD_MINORS) | |
250 | return comedi_dev_get_from_board_minor(minor); | |
cb3aadae KH |
251 | |
252 | return comedi_dev_get_from_subdevice_minor(minor); | |
b449c1ca IA |
253 | } |
254 | EXPORT_SYMBOL_GPL(comedi_dev_get_from_minor); | |
255 | ||
43bd33f2 | 256 | static struct comedi_subdevice * |
da56fdc6 | 257 | comedi_read_subdevice(const struct comedi_device *dev, unsigned int minor) |
43bd33f2 | 258 | { |
bd5b4173 | 259 | struct comedi_subdevice *s; |
da56fdc6 IA |
260 | |
261 | if (minor >= COMEDI_NUM_BOARD_MINORS) { | |
63ab0395 IA |
262 | s = comedi_subdevice_from_minor(dev, minor); |
263 | if (s == NULL || (s->subdev_flags & SDF_CMD_READ)) | |
bd5b4173 | 264 | return s; |
da56fdc6 IA |
265 | } |
266 | return dev->read_subdev; | |
43bd33f2 HS |
267 | } |
268 | ||
269 | static struct comedi_subdevice * | |
da56fdc6 | 270 | comedi_write_subdevice(const struct comedi_device *dev, unsigned int minor) |
43bd33f2 | 271 | { |
bd5b4173 | 272 | struct comedi_subdevice *s; |
da56fdc6 IA |
273 | |
274 | if (minor >= COMEDI_NUM_BOARD_MINORS) { | |
63ab0395 IA |
275 | s = comedi_subdevice_from_minor(dev, minor); |
276 | if (s == NULL || (s->subdev_flags & SDF_CMD_WRITE)) | |
bd5b4173 | 277 | return s; |
da56fdc6 IA |
278 | } |
279 | return dev->write_subdev; | |
43bd33f2 HS |
280 | } |
281 | ||
20f083c0 IA |
282 | static void comedi_file_reset(struct file *file) |
283 | { | |
284 | struct comedi_file *cfp = file->private_data; | |
285 | struct comedi_device *dev = cfp->dev; | |
286 | struct comedi_subdevice *s, *read_s, *write_s; | |
287 | unsigned int minor = iminor(file_inode(file)); | |
288 | ||
289 | read_s = dev->read_subdev; | |
290 | write_s = dev->write_subdev; | |
291 | if (minor >= COMEDI_NUM_BOARD_MINORS) { | |
292 | s = comedi_subdevice_from_minor(dev, minor); | |
293 | if (s == NULL || s->subdev_flags & SDF_CMD_READ) | |
294 | read_s = s; | |
295 | if (s == NULL || s->subdev_flags & SDF_CMD_WRITE) | |
296 | write_s = s; | |
297 | } | |
298 | cfp->last_attached = dev->attached; | |
299 | cfp->last_detach_count = dev->detach_count; | |
300 | ACCESS_ONCE(cfp->read_subdev) = read_s; | |
301 | ACCESS_ONCE(cfp->write_subdev) = write_s; | |
302 | } | |
303 | ||
304 | static void comedi_file_check(struct file *file) | |
305 | { | |
306 | struct comedi_file *cfp = file->private_data; | |
307 | struct comedi_device *dev = cfp->dev; | |
308 | ||
309 | if (cfp->last_attached != dev->attached || | |
310 | cfp->last_detach_count != dev->detach_count) | |
311 | comedi_file_reset(file); | |
312 | } | |
313 | ||
314 | static struct comedi_subdevice *comedi_file_read_subdevice(struct file *file) | |
315 | { | |
316 | struct comedi_file *cfp = file->private_data; | |
317 | ||
318 | comedi_file_check(file); | |
319 | return ACCESS_ONCE(cfp->read_subdev); | |
320 | } | |
321 | ||
322 | static struct comedi_subdevice *comedi_file_write_subdevice(struct file *file) | |
323 | { | |
324 | struct comedi_file *cfp = file->private_data; | |
325 | ||
326 | comedi_file_check(file); | |
327 | return ACCESS_ONCE(cfp->write_subdev); | |
328 | } | |
329 | ||
883db3d9 | 330 | static int resize_async_buffer(struct comedi_device *dev, |
482f0a21 | 331 | struct comedi_subdevice *s, unsigned new_size) |
a5011a26 | 332 | { |
482f0a21 | 333 | struct comedi_async *async = s->async; |
a5011a26 HS |
334 | int retval; |
335 | ||
336 | if (new_size > async->max_bufsize) | |
337 | return -EPERM; | |
338 | ||
339 | if (s->busy) { | |
272850f0 HS |
340 | dev_dbg(dev->class_dev, |
341 | "subdevice is busy, cannot resize buffer\n"); | |
a5011a26 HS |
342 | return -EBUSY; |
343 | } | |
d4526ab4 | 344 | if (comedi_buf_is_mmapped(s)) { |
272850f0 HS |
345 | dev_dbg(dev->class_dev, |
346 | "subdevice is mmapped, cannot resize buffer\n"); | |
a5011a26 HS |
347 | return -EBUSY; |
348 | } | |
349 | ||
a5011a26 HS |
350 | /* make sure buffer is an integral number of pages |
351 | * (we round up) */ | |
352 | new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK; | |
353 | ||
354 | retval = comedi_buf_alloc(dev, s, new_size); | |
355 | if (retval < 0) | |
356 | return retval; | |
357 | ||
358 | if (s->buf_change) { | |
d546b896 | 359 | retval = s->buf_change(dev, s); |
a5011a26 HS |
360 | if (retval < 0) |
361 | return retval; | |
362 | } | |
363 | ||
272850f0 HS |
364 | dev_dbg(dev->class_dev, "subd %d buffer resized to %i bytes\n", |
365 | s->index, async->prealloc_bufsz); | |
a5011a26 HS |
366 | return 0; |
367 | } | |
368 | ||
369 | /* sysfs attribute files */ | |
370 | ||
e56341ad | 371 | static ssize_t max_read_buffer_kb_show(struct device *csdev, |
a5011a26 HS |
372 | struct device_attribute *attr, char *buf) |
373 | { | |
c88db469 | 374 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
375 | struct comedi_device *dev; |
376 | struct comedi_subdevice *s; | |
72fd9fac | 377 | unsigned int size = 0; |
a5011a26 | 378 | |
be535c9a | 379 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 380 | if (!dev) |
c88db469 IA |
381 | return -ENODEV; |
382 | ||
7f4656c5 | 383 | mutex_lock(&dev->mutex); |
da56fdc6 | 384 | s = comedi_read_subdevice(dev, minor); |
72fd9fac HS |
385 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
386 | size = s->async->max_bufsize / 1024; | |
7f4656c5 | 387 | mutex_unlock(&dev->mutex); |
a5011a26 | 388 | |
be535c9a | 389 | comedi_dev_put(dev); |
ecd56ff9 | 390 | return snprintf(buf, PAGE_SIZE, "%u\n", size); |
a5011a26 HS |
391 | } |
392 | ||
e56341ad | 393 | static ssize_t max_read_buffer_kb_store(struct device *csdev, |
a5011a26 HS |
394 | struct device_attribute *attr, |
395 | const char *buf, size_t count) | |
396 | { | |
c88db469 | 397 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
398 | struct comedi_device *dev; |
399 | struct comedi_subdevice *s; | |
72fd9fac HS |
400 | unsigned int size; |
401 | int err; | |
402 | ||
403 | err = kstrtouint(buf, 10, &size); | |
404 | if (err) | |
405 | return err; | |
406 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 407 | return -EINVAL; |
72fd9fac | 408 | size *= 1024; |
a5011a26 | 409 | |
be535c9a | 410 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 411 | if (!dev) |
c88db469 IA |
412 | return -ENODEV; |
413 | ||
7f4656c5 | 414 | mutex_lock(&dev->mutex); |
da56fdc6 | 415 | s = comedi_read_subdevice(dev, minor); |
72fd9fac HS |
416 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
417 | s->async->max_bufsize = size; | |
418 | else | |
419 | err = -EINVAL; | |
7f4656c5 | 420 | mutex_unlock(&dev->mutex); |
a5011a26 | 421 | |
be535c9a | 422 | comedi_dev_put(dev); |
72fd9fac | 423 | return err ? err : count; |
a5011a26 | 424 | } |
e56341ad | 425 | static DEVICE_ATTR_RW(max_read_buffer_kb); |
a5011a26 | 426 | |
e56341ad | 427 | static ssize_t read_buffer_kb_show(struct device *csdev, |
a5011a26 HS |
428 | struct device_attribute *attr, char *buf) |
429 | { | |
c88db469 | 430 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
431 | struct comedi_device *dev; |
432 | struct comedi_subdevice *s; | |
72fd9fac | 433 | unsigned int size = 0; |
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_read_subdevice(dev, minor); |
72fd9fac HS |
441 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
442 | size = s->async->prealloc_bufsz / 1024; | |
7f4656c5 | 443 | mutex_unlock(&dev->mutex); |
a5011a26 | 444 | |
be535c9a | 445 | comedi_dev_put(dev); |
ecd56ff9 | 446 | return snprintf(buf, PAGE_SIZE, "%u\n", size); |
a5011a26 HS |
447 | } |
448 | ||
e56341ad | 449 | static ssize_t read_buffer_kb_store(struct device *csdev, |
a5011a26 HS |
450 | struct device_attribute *attr, |
451 | const char *buf, size_t count) | |
452 | { | |
c88db469 | 453 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
454 | struct comedi_device *dev; |
455 | struct comedi_subdevice *s; | |
72fd9fac HS |
456 | unsigned int size; |
457 | int err; | |
458 | ||
459 | err = kstrtouint(buf, 10, &size); | |
460 | if (err) | |
461 | return err; | |
462 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 463 | return -EINVAL; |
72fd9fac | 464 | size *= 1024; |
a5011a26 | 465 | |
be535c9a | 466 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 467 | if (!dev) |
c88db469 IA |
468 | return -ENODEV; |
469 | ||
7f4656c5 | 470 | mutex_lock(&dev->mutex); |
da56fdc6 | 471 | s = comedi_read_subdevice(dev, minor); |
72fd9fac | 472 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
482f0a21 | 473 | err = resize_async_buffer(dev, s, size); |
72fd9fac HS |
474 | else |
475 | err = -EINVAL; | |
7f4656c5 | 476 | mutex_unlock(&dev->mutex); |
a5011a26 | 477 | |
be535c9a | 478 | comedi_dev_put(dev); |
72fd9fac | 479 | return err ? err : count; |
a5011a26 | 480 | } |
e56341ad | 481 | static DEVICE_ATTR_RW(read_buffer_kb); |
883db3d9 | 482 | |
e56341ad | 483 | static ssize_t max_write_buffer_kb_show(struct device *csdev, |
a5011a26 HS |
484 | struct device_attribute *attr, |
485 | char *buf) | |
486 | { | |
c88db469 | 487 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
488 | struct comedi_device *dev; |
489 | struct comedi_subdevice *s; | |
72fd9fac | 490 | unsigned int size = 0; |
a5011a26 | 491 | |
be535c9a | 492 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 493 | if (!dev) |
c88db469 IA |
494 | return -ENODEV; |
495 | ||
7f4656c5 | 496 | mutex_lock(&dev->mutex); |
da56fdc6 | 497 | s = comedi_write_subdevice(dev, minor); |
72fd9fac HS |
498 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
499 | size = s->async->max_bufsize / 1024; | |
7f4656c5 | 500 | mutex_unlock(&dev->mutex); |
a5011a26 | 501 | |
be535c9a | 502 | comedi_dev_put(dev); |
ecd56ff9 | 503 | return snprintf(buf, PAGE_SIZE, "%u\n", size); |
a5011a26 HS |
504 | } |
505 | ||
e56341ad | 506 | static ssize_t max_write_buffer_kb_store(struct device *csdev, |
a5011a26 HS |
507 | struct device_attribute *attr, |
508 | const char *buf, size_t count) | |
509 | { | |
c88db469 | 510 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
511 | struct comedi_device *dev; |
512 | struct comedi_subdevice *s; | |
72fd9fac HS |
513 | unsigned int size; |
514 | int err; | |
515 | ||
516 | err = kstrtouint(buf, 10, &size); | |
517 | if (err) | |
518 | return err; | |
519 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 520 | return -EINVAL; |
72fd9fac | 521 | size *= 1024; |
a5011a26 | 522 | |
be535c9a | 523 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 524 | if (!dev) |
c88db469 IA |
525 | return -ENODEV; |
526 | ||
7f4656c5 | 527 | mutex_lock(&dev->mutex); |
da56fdc6 | 528 | s = comedi_write_subdevice(dev, minor); |
72fd9fac HS |
529 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
530 | s->async->max_bufsize = size; | |
531 | else | |
532 | err = -EINVAL; | |
7f4656c5 | 533 | mutex_unlock(&dev->mutex); |
a5011a26 | 534 | |
be535c9a | 535 | comedi_dev_put(dev); |
72fd9fac | 536 | return err ? err : count; |
a5011a26 | 537 | } |
e56341ad | 538 | static DEVICE_ATTR_RW(max_write_buffer_kb); |
a5011a26 | 539 | |
e56341ad | 540 | static ssize_t write_buffer_kb_show(struct device *csdev, |
a5011a26 HS |
541 | struct device_attribute *attr, char *buf) |
542 | { | |
c88db469 | 543 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
544 | struct comedi_device *dev; |
545 | struct comedi_subdevice *s; | |
72fd9fac | 546 | unsigned int size = 0; |
a5011a26 | 547 | |
be535c9a | 548 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 549 | if (!dev) |
c88db469 IA |
550 | return -ENODEV; |
551 | ||
7f4656c5 | 552 | mutex_lock(&dev->mutex); |
da56fdc6 | 553 | s = comedi_write_subdevice(dev, minor); |
72fd9fac HS |
554 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
555 | size = s->async->prealloc_bufsz / 1024; | |
7f4656c5 | 556 | mutex_unlock(&dev->mutex); |
a5011a26 | 557 | |
be535c9a | 558 | comedi_dev_put(dev); |
ecd56ff9 | 559 | return snprintf(buf, PAGE_SIZE, "%u\n", size); |
a5011a26 HS |
560 | } |
561 | ||
e56341ad | 562 | static ssize_t write_buffer_kb_store(struct device *csdev, |
a5011a26 HS |
563 | struct device_attribute *attr, |
564 | const char *buf, size_t count) | |
565 | { | |
c88db469 | 566 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
567 | struct comedi_device *dev; |
568 | struct comedi_subdevice *s; | |
72fd9fac HS |
569 | unsigned int size; |
570 | int err; | |
571 | ||
572 | err = kstrtouint(buf, 10, &size); | |
573 | if (err) | |
574 | return err; | |
575 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 576 | return -EINVAL; |
72fd9fac | 577 | size *= 1024; |
a5011a26 | 578 | |
be535c9a | 579 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 580 | if (!dev) |
c88db469 IA |
581 | return -ENODEV; |
582 | ||
7f4656c5 | 583 | mutex_lock(&dev->mutex); |
da56fdc6 | 584 | s = comedi_write_subdevice(dev, minor); |
72fd9fac | 585 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
482f0a21 | 586 | err = resize_async_buffer(dev, s, size); |
72fd9fac HS |
587 | else |
588 | err = -EINVAL; | |
7f4656c5 | 589 | mutex_unlock(&dev->mutex); |
a5011a26 | 590 | |
be535c9a | 591 | comedi_dev_put(dev); |
72fd9fac | 592 | return err ? err : count; |
a5011a26 | 593 | } |
e56341ad GKH |
594 | static DEVICE_ATTR_RW(write_buffer_kb); |
595 | ||
596 | static struct attribute *comedi_dev_attrs[] = { | |
597 | &dev_attr_max_read_buffer_kb.attr, | |
598 | &dev_attr_read_buffer_kb.attr, | |
599 | &dev_attr_max_write_buffer_kb.attr, | |
600 | &dev_attr_write_buffer_kb.attr, | |
601 | NULL, | |
a5011a26 | 602 | }; |
e56341ad | 603 | ATTRIBUTE_GROUPS(comedi_dev); |
ed9eccbe | 604 | |
2aae0076 HS |
605 | static void comedi_set_subdevice_runflags(struct comedi_subdevice *s, |
606 | unsigned mask, unsigned bits) | |
607 | { | |
608 | unsigned long flags; | |
609 | ||
610 | spin_lock_irqsave(&s->spin_lock, flags); | |
611 | s->runflags &= ~mask; | |
612 | s->runflags |= (bits & mask); | |
613 | spin_unlock_irqrestore(&s->spin_lock, flags); | |
614 | } | |
615 | ||
ade1764f | 616 | static unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s) |
74120719 HS |
617 | { |
618 | unsigned long flags; | |
619 | unsigned runflags; | |
620 | ||
621 | spin_lock_irqsave(&s->spin_lock, flags); | |
622 | runflags = s->runflags; | |
623 | spin_unlock_irqrestore(&s->spin_lock, flags); | |
624 | return runflags; | |
625 | } | |
74120719 | 626 | |
dd630cde IA |
627 | /** |
628 | * comedi_is_subdevice_running - check if async command running on subdevice | |
629 | * @s: comedi_subdevice struct | |
630 | * | |
631 | * Return true if an asynchronous comedi command is active on the comedi | |
632 | * subdevice, else return false. | |
633 | */ | |
e0dac318 HS |
634 | bool comedi_is_subdevice_running(struct comedi_subdevice *s) |
635 | { | |
636 | unsigned runflags = comedi_get_subdevice_runflags(s); | |
637 | ||
84bb0bcc | 638 | return (runflags & COMEDI_SRF_RUNNING) ? true : false; |
e0dac318 HS |
639 | } |
640 | EXPORT_SYMBOL_GPL(comedi_is_subdevice_running); | |
641 | ||
c098c21a HS |
642 | static bool comedi_is_subdevice_in_error(struct comedi_subdevice *s) |
643 | { | |
644 | unsigned runflags = comedi_get_subdevice_runflags(s); | |
645 | ||
84bb0bcc | 646 | return (runflags & COMEDI_SRF_ERROR) ? true : false; |
c098c21a HS |
647 | } |
648 | ||
9682e28c HS |
649 | static bool comedi_is_subdevice_idle(struct comedi_subdevice *s) |
650 | { | |
651 | unsigned runflags = comedi_get_subdevice_runflags(s); | |
652 | ||
84bb0bcc | 653 | return (runflags & COMEDI_SRF_BUSY_MASK) ? false : true; |
9682e28c HS |
654 | } |
655 | ||
588ba6dc | 656 | /** |
0480bcb9 | 657 | * comedi_alloc_spriv() - Allocate memory for the subdevice private data. |
588ba6dc | 658 | * @s: comedi_subdevice struct |
0480bcb9 | 659 | * @size: size of the memory to allocate |
588ba6dc HS |
660 | * |
661 | * This also sets the subdevice runflags to allow the core to automatically | |
662 | * free the private data during the detach. | |
663 | */ | |
0480bcb9 | 664 | void *comedi_alloc_spriv(struct comedi_subdevice *s, size_t size) |
588ba6dc | 665 | { |
0480bcb9 HS |
666 | s->private = kzalloc(size, GFP_KERNEL); |
667 | if (s->private) | |
84bb0bcc | 668 | s->runflags |= COMEDI_SRF_FREE_SPRIV; |
0480bcb9 | 669 | return s->private; |
588ba6dc | 670 | } |
0480bcb9 | 671 | EXPORT_SYMBOL_GPL(comedi_alloc_spriv); |
588ba6dc | 672 | |
2aae0076 HS |
673 | /* |
674 | This function restores a subdevice to an idle state. | |
675 | */ | |
676 | static void do_become_nonbusy(struct comedi_device *dev, | |
677 | struct comedi_subdevice *s) | |
678 | { | |
679 | struct comedi_async *async = s->async; | |
680 | ||
84bb0bcc | 681 | comedi_set_subdevice_runflags(s, COMEDI_SRF_RUNNING, 0); |
2aae0076 | 682 | if (async) { |
fcc18a9a | 683 | comedi_buf_reset(s); |
2aae0076 HS |
684 | async->inttrig = NULL; |
685 | kfree(async->cmd.chanlist); | |
686 | async->cmd.chanlist = NULL; | |
8da8c86f IA |
687 | s->busy = NULL; |
688 | wake_up_interruptible_all(&s->async->wait_head); | |
2aae0076 HS |
689 | } else { |
690 | dev_err(dev->class_dev, | |
691 | "BUG: (?) do_become_nonbusy called with async=NULL\n"); | |
8da8c86f | 692 | s->busy = NULL; |
2aae0076 | 693 | } |
2aae0076 HS |
694 | } |
695 | ||
696 | static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s) | |
697 | { | |
698 | int ret = 0; | |
699 | ||
f0124630 | 700 | if (comedi_is_subdevice_running(s) && s->cancel) |
2aae0076 HS |
701 | ret = s->cancel(dev, s); |
702 | ||
703 | do_become_nonbusy(dev, s); | |
704 | ||
705 | return ret; | |
706 | } | |
707 | ||
d19db51a IA |
708 | void comedi_device_cancel_all(struct comedi_device *dev) |
709 | { | |
710 | struct comedi_subdevice *s; | |
711 | int i; | |
712 | ||
713 | if (!dev->attached) | |
714 | return; | |
715 | ||
716 | for (i = 0; i < dev->n_subdevices; i++) { | |
717 | s = &dev->subdevices[i]; | |
718 | if (s->async) | |
719 | do_cancel(dev, s); | |
720 | } | |
721 | } | |
722 | ||
2aae0076 HS |
723 | static int is_device_busy(struct comedi_device *dev) |
724 | { | |
725 | struct comedi_subdevice *s; | |
726 | int i; | |
727 | ||
728 | if (!dev->attached) | |
729 | return 0; | |
730 | ||
731 | for (i = 0; i < dev->n_subdevices; i++) { | |
732 | s = &dev->subdevices[i]; | |
733 | if (s->busy) | |
734 | return 1; | |
d4526ab4 | 735 | if (s->async && comedi_buf_is_mmapped(s)) |
2aae0076 HS |
736 | return 1; |
737 | } | |
738 | ||
739 | return 0; | |
740 | } | |
741 | ||
ed9eccbe | 742 | /* |
18e01b24 IA |
743 | * COMEDI_DEVCONFIG ioctl |
744 | * attaches (and configures) or detaches a legacy device | |
745 | * | |
746 | * arg: | |
747 | * pointer to comedi_devconfig structure (NULL if detaching) | |
748 | * | |
749 | * reads: | |
750 | * comedi_devconfig structure (if attaching) | |
751 | * | |
752 | * writes: | |
753 | * nothing | |
754 | */ | |
0a85b6f0 | 755 | static int do_devconfig_ioctl(struct comedi_device *dev, |
92d0127c | 756 | struct comedi_devconfig __user *arg) |
ed9eccbe | 757 | { |
0707bb04 | 758 | struct comedi_devconfig it; |
ed9eccbe DS |
759 | |
760 | if (!capable(CAP_SYS_ADMIN)) | |
761 | return -EPERM; | |
762 | ||
763 | if (arg == NULL) { | |
764 | if (is_device_busy(dev)) | |
765 | return -EBUSY; | |
476b8477 | 766 | if (dev->attached) { |
ed9eccbe | 767 | struct module *driver_module = dev->driver->module; |
4bac39f6 | 768 | |
ed9eccbe DS |
769 | comedi_device_detach(dev); |
770 | module_put(driver_module); | |
771 | } | |
772 | return 0; | |
773 | } | |
774 | ||
bc252fd1 | 775 | if (copy_from_user(&it, arg, sizeof(it))) |
ed9eccbe DS |
776 | return -EFAULT; |
777 | ||
778 | it.board_name[COMEDI_NAMELEN - 1] = 0; | |
779 | ||
d1843132 HS |
780 | if (it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) { |
781 | dev_warn(dev->class_dev, | |
782 | "comedi_config --init_data is deprecated\n"); | |
783 | return -EINVAL; | |
ed9eccbe DS |
784 | } |
785 | ||
8ab4ed6e IA |
786 | if (dev->minor >= comedi_num_legacy_minors) |
787 | /* don't re-use dynamically allocated comedi devices */ | |
788 | return -EBUSY; | |
789 | ||
b2a644b4 IA |
790 | /* This increments the driver module count on success. */ |
791 | return comedi_device_attach(dev, &it); | |
ed9eccbe DS |
792 | } |
793 | ||
794 | /* | |
18e01b24 IA |
795 | * COMEDI_BUFCONFIG ioctl |
796 | * buffer configuration | |
797 | * | |
798 | * arg: | |
799 | * pointer to comedi_bufconfig structure | |
800 | * | |
801 | * reads: | |
802 | * comedi_bufconfig structure | |
803 | * | |
804 | * writes: | |
805 | * modified comedi_bufconfig structure | |
806 | */ | |
92d0127c GKH |
807 | static int do_bufconfig_ioctl(struct comedi_device *dev, |
808 | struct comedi_bufconfig __user *arg) | |
ed9eccbe | 809 | { |
be6aba4a | 810 | struct comedi_bufconfig bc; |
d163679c | 811 | struct comedi_async *async; |
34c43922 | 812 | struct comedi_subdevice *s; |
883db3d9 | 813 | int retval = 0; |
ed9eccbe | 814 | |
bc252fd1 | 815 | if (copy_from_user(&bc, arg, sizeof(bc))) |
ed9eccbe DS |
816 | return -EFAULT; |
817 | ||
11f80ddf | 818 | if (bc.subdevice >= dev->n_subdevices) |
ed9eccbe DS |
819 | return -EINVAL; |
820 | ||
b077f2cd | 821 | s = &dev->subdevices[bc.subdevice]; |
ed9eccbe DS |
822 | async = s->async; |
823 | ||
824 | if (!async) { | |
272850f0 HS |
825 | dev_dbg(dev->class_dev, |
826 | "subdevice does not have async capability\n"); | |
ed9eccbe DS |
827 | bc.size = 0; |
828 | bc.maximum_size = 0; | |
829 | goto copyback; | |
830 | } | |
831 | ||
832 | if (bc.maximum_size) { | |
833 | if (!capable(CAP_SYS_ADMIN)) | |
834 | return -EPERM; | |
835 | ||
836 | async->max_bufsize = bc.maximum_size; | |
837 | } | |
838 | ||
839 | if (bc.size) { | |
482f0a21 | 840 | retval = resize_async_buffer(dev, s, bc.size); |
883db3d9 FMH |
841 | if (retval < 0) |
842 | return retval; | |
ed9eccbe DS |
843 | } |
844 | ||
845 | bc.size = async->prealloc_bufsz; | |
846 | bc.maximum_size = async->max_bufsize; | |
847 | ||
476b8477 | 848 | copyback: |
bc252fd1 | 849 | if (copy_to_user(arg, &bc, sizeof(bc))) |
ed9eccbe DS |
850 | return -EFAULT; |
851 | ||
852 | return 0; | |
853 | } | |
854 | ||
855 | /* | |
18e01b24 IA |
856 | * COMEDI_DEVINFO ioctl |
857 | * device info | |
858 | * | |
859 | * arg: | |
860 | * pointer to comedi_devinfo structure | |
861 | * | |
862 | * reads: | |
863 | * nothing | |
864 | * | |
865 | * writes: | |
866 | * comedi_devinfo structure | |
867 | */ | |
0a85b6f0 | 868 | static int do_devinfo_ioctl(struct comedi_device *dev, |
92d0127c GKH |
869 | struct comedi_devinfo __user *arg, |
870 | struct file *file) | |
ed9eccbe | 871 | { |
0e700923 HS |
872 | struct comedi_subdevice *s; |
873 | struct comedi_devinfo devinfo; | |
ed9eccbe DS |
874 | |
875 | memset(&devinfo, 0, sizeof(devinfo)); | |
876 | ||
877 | /* fill devinfo structure */ | |
878 | devinfo.version_code = COMEDI_VERSION_CODE; | |
879 | devinfo.n_subdevs = dev->n_subdevices; | |
819cbb12 VK |
880 | strlcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN); |
881 | strlcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN); | |
ed9eccbe | 882 | |
20f083c0 | 883 | s = comedi_file_read_subdevice(file); |
0e700923 | 884 | if (s) |
90a35c15 | 885 | devinfo.read_subdevice = s->index; |
476b8477 | 886 | else |
ed9eccbe | 887 | devinfo.read_subdevice = -1; |
476b8477 | 888 | |
20f083c0 | 889 | s = comedi_file_write_subdevice(file); |
0e700923 | 890 | if (s) |
90a35c15 | 891 | devinfo.write_subdevice = s->index; |
476b8477 | 892 | else |
ed9eccbe | 893 | devinfo.write_subdevice = -1; |
ed9eccbe | 894 | |
bc252fd1 | 895 | if (copy_to_user(arg, &devinfo, sizeof(devinfo))) |
ed9eccbe DS |
896 | return -EFAULT; |
897 | ||
898 | return 0; | |
899 | } | |
900 | ||
901 | /* | |
18e01b24 IA |
902 | * COMEDI_SUBDINFO ioctl |
903 | * subdevices info | |
904 | * | |
905 | * arg: | |
906 | * pointer to array of comedi_subdinfo structures | |
907 | * | |
908 | * reads: | |
909 | * nothing | |
910 | * | |
911 | * writes: | |
912 | * array of comedi_subdinfo structures | |
913 | */ | |
0a85b6f0 | 914 | static int do_subdinfo_ioctl(struct comedi_device *dev, |
92d0127c | 915 | struct comedi_subdinfo __user *arg, void *file) |
ed9eccbe DS |
916 | { |
917 | int ret, i; | |
bd52efbb | 918 | struct comedi_subdinfo *tmp, *us; |
34c43922 | 919 | struct comedi_subdevice *s; |
ed9eccbe | 920 | |
bc252fd1 | 921 | tmp = kcalloc(dev->n_subdevices, sizeof(*tmp), GFP_KERNEL); |
ed9eccbe DS |
922 | if (!tmp) |
923 | return -ENOMEM; | |
924 | ||
925 | /* fill subdinfo structs */ | |
926 | for (i = 0; i < dev->n_subdevices; i++) { | |
b077f2cd | 927 | s = &dev->subdevices[i]; |
ed9eccbe DS |
928 | us = tmp + i; |
929 | ||
930 | us->type = s->type; | |
931 | us->n_chan = s->n_chan; | |
932 | us->subd_flags = s->subdev_flags; | |
f0124630 | 933 | if (comedi_is_subdevice_running(s)) |
ed9eccbe DS |
934 | us->subd_flags |= SDF_RUNNING; |
935 | #define TIMER_nanosec 5 /* backwards compatibility */ | |
936 | us->timer_type = TIMER_nanosec; | |
937 | us->len_chanlist = s->len_chanlist; | |
938 | us->maxdata = s->maxdata; | |
939 | if (s->range_table) { | |
940 | us->range_type = | |
476b8477 | 941 | (i << 24) | (0 << 16) | (s->range_table->length); |
ed9eccbe DS |
942 | } else { |
943 | us->range_type = 0; /* XXX */ | |
944 | } | |
ed9eccbe DS |
945 | |
946 | if (s->busy) | |
947 | us->subd_flags |= SDF_BUSY; | |
948 | if (s->busy == file) | |
949 | us->subd_flags |= SDF_BUSY_OWNER; | |
950 | if (s->lock) | |
951 | us->subd_flags |= SDF_LOCKED; | |
952 | if (s->lock == file) | |
953 | us->subd_flags |= SDF_LOCK_OWNER; | |
954 | if (!s->maxdata && s->maxdata_list) | |
955 | us->subd_flags |= SDF_MAXDATA; | |
ed9eccbe DS |
956 | if (s->range_table_list) |
957 | us->subd_flags |= SDF_RANGETYPE; | |
958 | if (s->do_cmd) | |
959 | us->subd_flags |= SDF_CMD; | |
960 | ||
961 | if (s->insn_bits != &insn_inval) | |
962 | us->insn_bits_support = COMEDI_SUPPORTED; | |
963 | else | |
964 | us->insn_bits_support = COMEDI_UNSUPPORTED; | |
ed9eccbe DS |
965 | } |
966 | ||
bc252fd1 | 967 | ret = copy_to_user(arg, tmp, dev->n_subdevices * sizeof(*tmp)); |
ed9eccbe DS |
968 | |
969 | kfree(tmp); | |
970 | ||
971 | return ret ? -EFAULT : 0; | |
972 | } | |
973 | ||
974 | /* | |
18e01b24 IA |
975 | * COMEDI_CHANINFO ioctl |
976 | * subdevice channel info | |
977 | * | |
978 | * arg: | |
979 | * pointer to comedi_chaninfo structure | |
980 | * | |
981 | * reads: | |
982 | * comedi_chaninfo structure | |
983 | * | |
984 | * writes: | |
985 | * array of maxdata values to chaninfo->maxdata_list if requested | |
986 | * array of range table lengths to chaninfo->range_table_list if requested | |
987 | */ | |
0a85b6f0 | 988 | static int do_chaninfo_ioctl(struct comedi_device *dev, |
92d0127c | 989 | struct comedi_chaninfo __user *arg) |
ed9eccbe | 990 | { |
34c43922 | 991 | struct comedi_subdevice *s; |
a18b416d | 992 | struct comedi_chaninfo it; |
ed9eccbe | 993 | |
bc252fd1 | 994 | if (copy_from_user(&it, arg, sizeof(it))) |
ed9eccbe DS |
995 | return -EFAULT; |
996 | ||
997 | if (it.subdev >= dev->n_subdevices) | |
998 | return -EINVAL; | |
b077f2cd | 999 | s = &dev->subdevices[it.subdev]; |
ed9eccbe DS |
1000 | |
1001 | if (it.maxdata_list) { | |
1002 | if (s->maxdata || !s->maxdata_list) | |
1003 | return -EINVAL; | |
1004 | if (copy_to_user(it.maxdata_list, s->maxdata_list, | |
790c5541 | 1005 | s->n_chan * sizeof(unsigned int))) |
ed9eccbe DS |
1006 | return -EFAULT; |
1007 | } | |
1008 | ||
64d9b1d2 IA |
1009 | if (it.flaglist) |
1010 | return -EINVAL; /* flaglist not supported */ | |
ed9eccbe DS |
1011 | |
1012 | if (it.rangelist) { | |
1013 | int i; | |
1014 | ||
1015 | if (!s->range_table_list) | |
1016 | return -EINVAL; | |
1017 | for (i = 0; i < s->n_chan; i++) { | |
1018 | int x; | |
1019 | ||
1020 | x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) | | |
476b8477 | 1021 | (s->range_table_list[i]->length); |
81604d43 VK |
1022 | if (put_user(x, it.rangelist + i)) |
1023 | return -EFAULT; | |
ed9eccbe | 1024 | } |
476b8477 GKH |
1025 | #if 0 |
1026 | if (copy_to_user(it.rangelist, s->range_type_list, | |
0a85b6f0 | 1027 | s->n_chan * sizeof(unsigned int))) |
476b8477 GKH |
1028 | return -EFAULT; |
1029 | #endif | |
ed9eccbe DS |
1030 | } |
1031 | ||
1032 | return 0; | |
1033 | } | |
1034 | ||
18e01b24 IA |
1035 | /* |
1036 | * COMEDI_BUFINFO ioctl | |
1037 | * buffer information | |
1038 | * | |
1039 | * arg: | |
1040 | * pointer to comedi_bufinfo structure | |
1041 | * | |
1042 | * reads: | |
1043 | * comedi_bufinfo structure | |
1044 | * | |
1045 | * writes: | |
1046 | * modified comedi_bufinfo structure | |
1047 | */ | |
92d0127c | 1048 | static int do_bufinfo_ioctl(struct comedi_device *dev, |
53fa827e | 1049 | struct comedi_bufinfo __user *arg, void *file) |
ed9eccbe | 1050 | { |
9aa5339a | 1051 | struct comedi_bufinfo bi; |
34c43922 | 1052 | struct comedi_subdevice *s; |
d163679c | 1053 | struct comedi_async *async; |
ed9eccbe | 1054 | |
bc252fd1 | 1055 | if (copy_from_user(&bi, arg, sizeof(bi))) |
ed9eccbe DS |
1056 | return -EFAULT; |
1057 | ||
7b1a5e2f | 1058 | if (bi.subdevice >= dev->n_subdevices) |
ed9eccbe DS |
1059 | return -EINVAL; |
1060 | ||
b077f2cd | 1061 | s = &dev->subdevices[bi.subdevice]; |
53fa827e | 1062 | |
ed9eccbe DS |
1063 | async = s->async; |
1064 | ||
1065 | if (!async) { | |
272850f0 HS |
1066 | dev_dbg(dev->class_dev, |
1067 | "subdevice does not have async capability\n"); | |
ed9eccbe DS |
1068 | bi.buf_write_ptr = 0; |
1069 | bi.buf_read_ptr = 0; | |
1070 | bi.buf_write_count = 0; | |
1071 | bi.buf_read_count = 0; | |
4772c018 IA |
1072 | bi.bytes_read = 0; |
1073 | bi.bytes_written = 0; | |
ed9eccbe DS |
1074 | goto copyback; |
1075 | } | |
53fa827e IA |
1076 | if (!s->busy) { |
1077 | bi.bytes_read = 0; | |
1078 | bi.bytes_written = 0; | |
1079 | goto copyback_position; | |
1080 | } | |
1081 | if (s->busy != file) | |
1082 | return -EACCES; | |
ed9eccbe | 1083 | |
75f6108f | 1084 | if (bi.bytes_read && !(async->cmd.flags & CMDF_WRITE)) { |
d13be55a | 1085 | bi.bytes_read = comedi_buf_read_alloc(s, bi.bytes_read); |
f1df8662 | 1086 | comedi_buf_read_free(s, bi.bytes_read); |
ed9eccbe | 1087 | |
9682e28c | 1088 | if (comedi_is_subdevice_idle(s) && |
f4f3f7cf | 1089 | comedi_buf_n_bytes_ready(s) == 0) { |
ed9eccbe DS |
1090 | do_become_nonbusy(dev, s); |
1091 | } | |
1092 | } | |
1093 | ||
75f6108f | 1094 | if (bi.bytes_written && (async->cmd.flags & CMDF_WRITE)) { |
ed9eccbe | 1095 | bi.bytes_written = |
24e894bb | 1096 | comedi_buf_write_alloc(s, bi.bytes_written); |
940dd35d | 1097 | comedi_buf_write_free(s, bi.bytes_written); |
ed9eccbe DS |
1098 | } |
1099 | ||
53fa827e | 1100 | copyback_position: |
ed9eccbe DS |
1101 | bi.buf_write_count = async->buf_write_count; |
1102 | bi.buf_write_ptr = async->buf_write_ptr; | |
1103 | bi.buf_read_count = async->buf_read_count; | |
1104 | bi.buf_read_ptr = async->buf_read_ptr; | |
1105 | ||
476b8477 | 1106 | copyback: |
bc252fd1 | 1107 | if (copy_to_user(arg, &bi, sizeof(bi))) |
ed9eccbe DS |
1108 | return -EFAULT; |
1109 | ||
1110 | return 0; | |
1111 | } | |
1112 | ||
0a85b6f0 MT |
1113 | static int check_insn_config_length(struct comedi_insn *insn, |
1114 | unsigned int *data) | |
ed9eccbe | 1115 | { |
476b8477 GKH |
1116 | if (insn->n < 1) |
1117 | return -EINVAL; | |
ed9eccbe DS |
1118 | |
1119 | switch (data[0]) { | |
1120 | case INSN_CONFIG_DIO_OUTPUT: | |
1121 | case INSN_CONFIG_DIO_INPUT: | |
1122 | case INSN_CONFIG_DISARM: | |
1123 | case INSN_CONFIG_RESET: | |
1124 | if (insn->n == 1) | |
1125 | return 0; | |
1126 | break; | |
1127 | case INSN_CONFIG_ARM: | |
1128 | case INSN_CONFIG_DIO_QUERY: | |
1129 | case INSN_CONFIG_BLOCK_SIZE: | |
1130 | case INSN_CONFIG_FILTER: | |
1131 | case INSN_CONFIG_SERIAL_CLOCK: | |
1132 | case INSN_CONFIG_BIDIRECTIONAL_DATA: | |
1133 | case INSN_CONFIG_ALT_SOURCE: | |
1134 | case INSN_CONFIG_SET_COUNTER_MODE: | |
1135 | case INSN_CONFIG_8254_READ_STATUS: | |
1136 | case INSN_CONFIG_SET_ROUTING: | |
1137 | case INSN_CONFIG_GET_ROUTING: | |
1138 | case INSN_CONFIG_GET_PWM_STATUS: | |
1139 | case INSN_CONFIG_PWM_SET_PERIOD: | |
1140 | case INSN_CONFIG_PWM_GET_PERIOD: | |
1141 | if (insn->n == 2) | |
1142 | return 0; | |
1143 | break; | |
1144 | case INSN_CONFIG_SET_GATE_SRC: | |
1145 | case INSN_CONFIG_GET_GATE_SRC: | |
1146 | case INSN_CONFIG_SET_CLOCK_SRC: | |
1147 | case INSN_CONFIG_GET_CLOCK_SRC: | |
1148 | case INSN_CONFIG_SET_OTHER_SRC: | |
1149 | case INSN_CONFIG_GET_COUNTER_STATUS: | |
1150 | case INSN_CONFIG_PWM_SET_H_BRIDGE: | |
1151 | case INSN_CONFIG_PWM_GET_H_BRIDGE: | |
1152 | case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE: | |
1153 | if (insn->n == 3) | |
1154 | return 0; | |
1155 | break; | |
1156 | case INSN_CONFIG_PWM_OUTPUT: | |
1157 | case INSN_CONFIG_ANALOG_TRIG: | |
1158 | if (insn->n == 5) | |
1159 | return 0; | |
1160 | break; | |
b0a2b6d8 IA |
1161 | case INSN_CONFIG_DIGITAL_TRIG: |
1162 | if (insn->n == 6) | |
1163 | return 0; | |
1164 | break; | |
0a85b6f0 MT |
1165 | /* by default we allow the insn since we don't have checks for |
1166 | * all possible cases yet */ | |
ed9eccbe | 1167 | default: |
c2ad078b | 1168 | pr_warn("No check for data length of config insn id %i is implemented\n", |
4f870fe6 | 1169 | data[0]); |
c2ad078b HS |
1170 | pr_warn("Add a check to %s in %s\n", __func__, __FILE__); |
1171 | pr_warn("Assuming n=%i is correct\n", insn->n); | |
ed9eccbe | 1172 | return 0; |
ed9eccbe DS |
1173 | } |
1174 | return -EINVAL; | |
1175 | } | |
1176 | ||
0a85b6f0 MT |
1177 | static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn, |
1178 | unsigned int *data, void *file) | |
ed9eccbe | 1179 | { |
34c43922 | 1180 | struct comedi_subdevice *s; |
ed9eccbe DS |
1181 | int ret = 0; |
1182 | int i; | |
1183 | ||
1184 | if (insn->insn & INSN_MASK_SPECIAL) { | |
1185 | /* a non-subdevice instruction */ | |
1186 | ||
1187 | switch (insn->insn) { | |
1188 | case INSN_GTOD: | |
1189 | { | |
1190 | struct timeval tv; | |
1191 | ||
1192 | if (insn->n != 2) { | |
1193 | ret = -EINVAL; | |
1194 | break; | |
1195 | } | |
1196 | ||
1197 | do_gettimeofday(&tv); | |
1198 | data[0] = tv.tv_sec; | |
1199 | data[1] = tv.tv_usec; | |
1200 | ret = 2; | |
1201 | ||
1202 | break; | |
1203 | } | |
1204 | case INSN_WAIT: | |
1205 | if (insn->n != 1 || data[0] >= 100000) { | |
1206 | ret = -EINVAL; | |
1207 | break; | |
1208 | } | |
1209 | udelay(data[0] / 1000); | |
1210 | ret = 1; | |
1211 | break; | |
1212 | case INSN_INTTRIG: | |
1213 | if (insn->n != 1) { | |
1214 | ret = -EINVAL; | |
1215 | break; | |
1216 | } | |
1217 | if (insn->subdev >= dev->n_subdevices) { | |
272850f0 HS |
1218 | dev_dbg(dev->class_dev, |
1219 | "%d not usable subdevice\n", | |
ed9eccbe DS |
1220 | insn->subdev); |
1221 | ret = -EINVAL; | |
1222 | break; | |
1223 | } | |
b077f2cd | 1224 | s = &dev->subdevices[insn->subdev]; |
ed9eccbe | 1225 | if (!s->async) { |
272850f0 | 1226 | dev_dbg(dev->class_dev, "no async\n"); |
ed9eccbe DS |
1227 | ret = -EINVAL; |
1228 | break; | |
1229 | } | |
1230 | if (!s->async->inttrig) { | |
272850f0 | 1231 | dev_dbg(dev->class_dev, "no inttrig\n"); |
ed9eccbe DS |
1232 | ret = -EAGAIN; |
1233 | break; | |
1234 | } | |
5d06e3df | 1235 | ret = s->async->inttrig(dev, s, data[0]); |
ed9eccbe DS |
1236 | if (ret >= 0) |
1237 | ret = 1; | |
1238 | break; | |
1239 | default: | |
272850f0 | 1240 | dev_dbg(dev->class_dev, "invalid insn\n"); |
ed9eccbe DS |
1241 | ret = -EINVAL; |
1242 | break; | |
1243 | } | |
1244 | } else { | |
1245 | /* a subdevice instruction */ | |
790c5541 | 1246 | unsigned int maxdata; |
ed9eccbe DS |
1247 | |
1248 | if (insn->subdev >= dev->n_subdevices) { | |
272850f0 HS |
1249 | dev_dbg(dev->class_dev, "subdevice %d out of range\n", |
1250 | insn->subdev); | |
ed9eccbe DS |
1251 | ret = -EINVAL; |
1252 | goto out; | |
1253 | } | |
b077f2cd | 1254 | s = &dev->subdevices[insn->subdev]; |
ed9eccbe DS |
1255 | |
1256 | if (s->type == COMEDI_SUBD_UNUSED) { | |
272850f0 HS |
1257 | dev_dbg(dev->class_dev, "%d not usable subdevice\n", |
1258 | insn->subdev); | |
ed9eccbe DS |
1259 | ret = -EIO; |
1260 | goto out; | |
1261 | } | |
1262 | ||
1263 | /* are we locked? (ioctl lock) */ | |
1264 | if (s->lock && s->lock != file) { | |
272850f0 | 1265 | dev_dbg(dev->class_dev, "device locked\n"); |
ed9eccbe DS |
1266 | ret = -EACCES; |
1267 | goto out; | |
1268 | } | |
1269 | ||
0fd0ca75 | 1270 | ret = comedi_check_chanlist(s, 1, &insn->chanspec); |
476b8477 | 1271 | if (ret < 0) { |
ed9eccbe | 1272 | ret = -EINVAL; |
272850f0 | 1273 | dev_dbg(dev->class_dev, "bad chanspec\n"); |
ed9eccbe DS |
1274 | goto out; |
1275 | } | |
1276 | ||
1277 | if (s->busy) { | |
1278 | ret = -EBUSY; | |
1279 | goto out; | |
1280 | } | |
1281 | /* This looks arbitrary. It is. */ | |
1282 | s->busy = &parse_insn; | |
1283 | switch (insn->insn) { | |
1284 | case INSN_READ: | |
1285 | ret = s->insn_read(dev, s, insn, data); | |
22ca19d9 HS |
1286 | if (ret == -ETIMEDOUT) { |
1287 | dev_dbg(dev->class_dev, | |
1288 | "subdevice %d read instruction timed out\n", | |
1289 | s->index); | |
1290 | } | |
ed9eccbe DS |
1291 | break; |
1292 | case INSN_WRITE: | |
1293 | maxdata = s->maxdata_list | |
476b8477 GKH |
1294 | ? s->maxdata_list[CR_CHAN(insn->chanspec)] |
1295 | : s->maxdata; | |
ed9eccbe DS |
1296 | for (i = 0; i < insn->n; ++i) { |
1297 | if (data[i] > maxdata) { | |
1298 | ret = -EINVAL; | |
272850f0 HS |
1299 | dev_dbg(dev->class_dev, |
1300 | "bad data value(s)\n"); | |
ed9eccbe DS |
1301 | break; |
1302 | } | |
1303 | } | |
22ca19d9 | 1304 | if (ret == 0) { |
ed9eccbe | 1305 | ret = s->insn_write(dev, s, insn, data); |
22ca19d9 HS |
1306 | if (ret == -ETIMEDOUT) { |
1307 | dev_dbg(dev->class_dev, | |
1308 | "subdevice %d write instruction timed out\n", | |
1309 | s->index); | |
1310 | } | |
1311 | } | |
ed9eccbe DS |
1312 | break; |
1313 | case INSN_BITS: | |
1314 | if (insn->n != 2) { | |
1315 | ret = -EINVAL; | |
2f644ccf IA |
1316 | } else { |
1317 | /* Most drivers ignore the base channel in | |
1318 | * insn->chanspec. Fix this here if | |
1319 | * the subdevice has <= 32 channels. */ | |
36efbacd HS |
1320 | unsigned int orig_mask = data[0]; |
1321 | unsigned int shift = 0; | |
2f644ccf | 1322 | |
2f644ccf IA |
1323 | if (s->n_chan <= 32) { |
1324 | shift = CR_CHAN(insn->chanspec); | |
1325 | if (shift > 0) { | |
1326 | insn->chanspec = 0; | |
1327 | data[0] <<= shift; | |
1328 | data[1] <<= shift; | |
1329 | } | |
36efbacd | 1330 | } |
2f644ccf IA |
1331 | ret = s->insn_bits(dev, s, insn, data); |
1332 | data[0] = orig_mask; | |
1333 | if (shift > 0) | |
1334 | data[1] >>= shift; | |
ed9eccbe | 1335 | } |
ed9eccbe DS |
1336 | break; |
1337 | case INSN_CONFIG: | |
1338 | ret = check_insn_config_length(insn, data); | |
1339 | if (ret) | |
1340 | break; | |
1341 | ret = s->insn_config(dev, s, insn, data); | |
1342 | break; | |
1343 | default: | |
1344 | ret = -EINVAL; | |
1345 | break; | |
1346 | } | |
1347 | ||
1348 | s->busy = NULL; | |
1349 | } | |
1350 | ||
476b8477 | 1351 | out: |
ed9eccbe DS |
1352 | return ret; |
1353 | } | |
1354 | ||
5b6cbd87 | 1355 | /* |
18e01b24 IA |
1356 | * COMEDI_INSNLIST ioctl |
1357 | * synchronous instruction list | |
5b6cbd87 | 1358 | * |
18e01b24 IA |
1359 | * arg: |
1360 | * pointer to comedi_insnlist structure | |
5b6cbd87 | 1361 | * |
18e01b24 IA |
1362 | * reads: |
1363 | * comedi_insnlist structure | |
1364 | * array of comedi_insn structures from insnlist->insns pointer | |
1365 | * data (for writes) from insns[].data pointers | |
5b6cbd87 | 1366 | * |
18e01b24 IA |
1367 | * writes: |
1368 | * data (for reads) to insns[].data pointers | |
5b6cbd87 HS |
1369 | */ |
1370 | /* arbitrary limits */ | |
1371 | #define MAX_SAMPLES 256 | |
1372 | static int do_insnlist_ioctl(struct comedi_device *dev, | |
1373 | struct comedi_insnlist __user *arg, void *file) | |
1374 | { | |
1375 | struct comedi_insnlist insnlist; | |
1376 | struct comedi_insn *insns = NULL; | |
1377 | unsigned int *data = NULL; | |
1378 | int i = 0; | |
1379 | int ret = 0; | |
1380 | ||
1381 | if (copy_from_user(&insnlist, arg, sizeof(insnlist))) | |
1382 | return -EFAULT; | |
1383 | ||
f4a8f528 | 1384 | data = kmalloc_array(MAX_SAMPLES, sizeof(unsigned int), GFP_KERNEL); |
5b6cbd87 | 1385 | if (!data) { |
5b6cbd87 HS |
1386 | ret = -ENOMEM; |
1387 | goto error; | |
1388 | } | |
1389 | ||
1390 | insns = kcalloc(insnlist.n_insns, sizeof(*insns), GFP_KERNEL); | |
1391 | if (!insns) { | |
5b6cbd87 HS |
1392 | ret = -ENOMEM; |
1393 | goto error; | |
1394 | } | |
1395 | ||
1396 | if (copy_from_user(insns, insnlist.insns, | |
1397 | sizeof(*insns) * insnlist.n_insns)) { | |
272850f0 | 1398 | dev_dbg(dev->class_dev, "copy_from_user failed\n"); |
5b6cbd87 HS |
1399 | ret = -EFAULT; |
1400 | goto error; | |
1401 | } | |
1402 | ||
1403 | for (i = 0; i < insnlist.n_insns; i++) { | |
1404 | if (insns[i].n > MAX_SAMPLES) { | |
272850f0 HS |
1405 | dev_dbg(dev->class_dev, |
1406 | "number of samples too large\n"); | |
5b6cbd87 HS |
1407 | ret = -EINVAL; |
1408 | goto error; | |
1409 | } | |
1410 | if (insns[i].insn & INSN_MASK_WRITE) { | |
1411 | if (copy_from_user(data, insns[i].data, | |
1412 | insns[i].n * sizeof(unsigned int))) { | |
272850f0 HS |
1413 | dev_dbg(dev->class_dev, |
1414 | "copy_from_user failed\n"); | |
5b6cbd87 HS |
1415 | ret = -EFAULT; |
1416 | goto error; | |
1417 | } | |
1418 | } | |
1419 | ret = parse_insn(dev, insns + i, data, file); | |
1420 | if (ret < 0) | |
1421 | goto error; | |
1422 | if (insns[i].insn & INSN_MASK_READ) { | |
1423 | if (copy_to_user(insns[i].data, data, | |
1424 | insns[i].n * sizeof(unsigned int))) { | |
272850f0 HS |
1425 | dev_dbg(dev->class_dev, |
1426 | "copy_to_user failed\n"); | |
5b6cbd87 HS |
1427 | ret = -EFAULT; |
1428 | goto error; | |
1429 | } | |
1430 | } | |
1431 | if (need_resched()) | |
1432 | schedule(); | |
1433 | } | |
1434 | ||
1435 | error: | |
1436 | kfree(insns); | |
1437 | kfree(data); | |
1438 | ||
1439 | if (ret < 0) | |
1440 | return ret; | |
1441 | return i; | |
1442 | } | |
1443 | ||
ed9eccbe | 1444 | /* |
18e01b24 IA |
1445 | * COMEDI_INSN ioctl |
1446 | * synchronous instruction | |
ed9eccbe | 1447 | * |
18e01b24 IA |
1448 | * arg: |
1449 | * pointer to comedi_insn structure | |
ed9eccbe | 1450 | * |
18e01b24 IA |
1451 | * reads: |
1452 | * comedi_insn structure | |
1453 | * data (for writes) from insn->data pointer | |
ed9eccbe | 1454 | * |
18e01b24 IA |
1455 | * writes: |
1456 | * data (for reads) to insn->data pointer | |
ed9eccbe | 1457 | */ |
92d0127c GKH |
1458 | static int do_insn_ioctl(struct comedi_device *dev, |
1459 | struct comedi_insn __user *arg, void *file) | |
ed9eccbe | 1460 | { |
90035c08 | 1461 | struct comedi_insn insn; |
790c5541 | 1462 | unsigned int *data = NULL; |
ed9eccbe DS |
1463 | int ret = 0; |
1464 | ||
f4a8f528 | 1465 | data = kmalloc_array(MAX_SAMPLES, sizeof(unsigned int), GFP_KERNEL); |
ed9eccbe DS |
1466 | if (!data) { |
1467 | ret = -ENOMEM; | |
1468 | goto error; | |
1469 | } | |
1470 | ||
bc252fd1 | 1471 | if (copy_from_user(&insn, arg, sizeof(insn))) { |
ed9eccbe DS |
1472 | ret = -EFAULT; |
1473 | goto error; | |
1474 | } | |
1475 | ||
1476 | /* This is where the behavior of insn and insnlist deviate. */ | |
1477 | if (insn.n > MAX_SAMPLES) | |
1478 | insn.n = MAX_SAMPLES; | |
1479 | if (insn.insn & INSN_MASK_WRITE) { | |
21fe2eea M |
1480 | if (copy_from_user(data, |
1481 | insn.data, | |
1482 | insn.n * sizeof(unsigned int))) { | |
ed9eccbe DS |
1483 | ret = -EFAULT; |
1484 | goto error; | |
1485 | } | |
1486 | } | |
1487 | ret = parse_insn(dev, &insn, data, file); | |
1488 | if (ret < 0) | |
1489 | goto error; | |
1490 | if (insn.insn & INSN_MASK_READ) { | |
21fe2eea M |
1491 | if (copy_to_user(insn.data, |
1492 | data, | |
1493 | insn.n * sizeof(unsigned int))) { | |
ed9eccbe DS |
1494 | ret = -EFAULT; |
1495 | goto error; | |
1496 | } | |
1497 | } | |
1498 | ret = insn.n; | |
1499 | ||
476b8477 GKH |
1500 | error: |
1501 | kfree(data); | |
ed9eccbe DS |
1502 | |
1503 | return ret; | |
1504 | } | |
1505 | ||
87ece583 HS |
1506 | static int __comedi_get_user_cmd(struct comedi_device *dev, |
1507 | struct comedi_cmd __user *arg, | |
1508 | struct comedi_cmd *cmd) | |
ed9eccbe | 1509 | { |
34c43922 | 1510 | struct comedi_subdevice *s; |
ed9eccbe | 1511 | |
87ece583 | 1512 | if (copy_from_user(cmd, arg, sizeof(*cmd))) { |
272850f0 | 1513 | dev_dbg(dev->class_dev, "bad cmd address\n"); |
ed9eccbe DS |
1514 | return -EFAULT; |
1515 | } | |
ed9eccbe | 1516 | |
87ece583 HS |
1517 | if (cmd->subdev >= dev->n_subdevices) { |
1518 | dev_dbg(dev->class_dev, "%d no such subdevice\n", cmd->subdev); | |
ed9eccbe DS |
1519 | return -ENODEV; |
1520 | } | |
1521 | ||
87ece583 | 1522 | s = &dev->subdevices[cmd->subdev]; |
ed9eccbe DS |
1523 | |
1524 | if (s->type == COMEDI_SUBD_UNUSED) { | |
b2f48741 YD |
1525 | dev_dbg(dev->class_dev, "%d not valid subdevice\n", |
1526 | cmd->subdev); | |
ed9eccbe DS |
1527 | return -EIO; |
1528 | } | |
1529 | ||
1530 | if (!s->do_cmd || !s->do_cmdtest || !s->async) { | |
272850f0 | 1531 | dev_dbg(dev->class_dev, |
b2f48741 YD |
1532 | "subdevice %d does not support commands\n", |
1533 | cmd->subdev); | |
ed9eccbe DS |
1534 | return -EIO; |
1535 | } | |
1536 | ||
87ece583 HS |
1537 | /* make sure channel/gain list isn't too long */ |
1538 | if (cmd->chanlist_len > s->len_chanlist) { | |
1539 | dev_dbg(dev->class_dev, "channel/gain list too long %d > %d\n", | |
1540 | cmd->chanlist_len, s->len_chanlist); | |
1541 | return -EINVAL; | |
1542 | } | |
1543 | ||
5d070cf2 IA |
1544 | /* |
1545 | * Set the CMDF_WRITE flag to the correct state if the subdevice | |
1546 | * supports only "read" commands or only "write" commands. | |
1547 | */ | |
1548 | switch (s->subdev_flags & (SDF_CMD_READ | SDF_CMD_WRITE)) { | |
1549 | case SDF_CMD_READ: | |
1550 | cmd->flags &= ~CMDF_WRITE; | |
1551 | break; | |
1552 | case SDF_CMD_WRITE: | |
1553 | cmd->flags |= CMDF_WRITE; | |
1554 | break; | |
1555 | default: | |
1556 | break; | |
1557 | } | |
1558 | ||
87ece583 HS |
1559 | return 0; |
1560 | } | |
1561 | ||
c6cd0eef HS |
1562 | static int __comedi_get_user_chanlist(struct comedi_device *dev, |
1563 | struct comedi_subdevice *s, | |
1564 | unsigned int __user *user_chanlist, | |
1565 | struct comedi_cmd *cmd) | |
1566 | { | |
1567 | unsigned int *chanlist; | |
1568 | int ret; | |
1569 | ||
238b5ad8 | 1570 | cmd->chanlist = NULL; |
c6cd0eef HS |
1571 | chanlist = memdup_user(user_chanlist, |
1572 | cmd->chanlist_len * sizeof(unsigned int)); | |
1573 | if (IS_ERR(chanlist)) | |
1574 | return PTR_ERR(chanlist); | |
1575 | ||
1576 | /* make sure each element in channel/gain list is valid */ | |
1577 | ret = comedi_check_chanlist(s, cmd->chanlist_len, chanlist); | |
1578 | if (ret < 0) { | |
1579 | kfree(chanlist); | |
1580 | return ret; | |
1581 | } | |
1582 | ||
1583 | cmd->chanlist = chanlist; | |
1584 | ||
1585 | return 0; | |
1586 | } | |
1587 | ||
18e01b24 IA |
1588 | /* |
1589 | * COMEDI_CMD ioctl | |
1590 | * asynchronous acquisition command set-up | |
1591 | * | |
1592 | * arg: | |
1593 | * pointer to comedi_cmd structure | |
1594 | * | |
1595 | * reads: | |
1596 | * comedi_cmd structure | |
1597 | * channel/range list from cmd->chanlist pointer | |
1598 | * | |
1599 | * writes: | |
1600 | * possibly modified comedi_cmd structure (when -EAGAIN returned) | |
1601 | */ | |
87ece583 HS |
1602 | static int do_cmd_ioctl(struct comedi_device *dev, |
1603 | struct comedi_cmd __user *arg, void *file) | |
1604 | { | |
1605 | struct comedi_cmd cmd; | |
1606 | struct comedi_subdevice *s; | |
1607 | struct comedi_async *async; | |
1608 | unsigned int __user *user_chanlist; | |
1609 | int ret; | |
1610 | ||
1611 | /* get the user's cmd and do some simple validation */ | |
1612 | ret = __comedi_get_user_cmd(dev, arg, &cmd); | |
1613 | if (ret) | |
1614 | return ret; | |
1615 | ||
1616 | /* save user's chanlist pointer so it can be restored later */ | |
1617 | user_chanlist = (unsigned int __user *)cmd.chanlist; | |
1618 | ||
1619 | s = &dev->subdevices[cmd.subdev]; | |
1620 | async = s->async; | |
1621 | ||
ed9eccbe DS |
1622 | /* are we locked? (ioctl lock) */ |
1623 | if (s->lock && s->lock != file) { | |
272850f0 | 1624 | dev_dbg(dev->class_dev, "subdevice locked\n"); |
ed9eccbe DS |
1625 | return -EACCES; |
1626 | } | |
1627 | ||
1628 | /* are we busy? */ | |
1629 | if (s->busy) { | |
272850f0 | 1630 | dev_dbg(dev->class_dev, "subdevice busy\n"); |
ed9eccbe DS |
1631 | return -EBUSY; |
1632 | } | |
ed9eccbe | 1633 | |
ed9eccbe | 1634 | /* make sure channel/gain list isn't too short */ |
88bc0574 | 1635 | if (cmd.chanlist_len < 1) { |
272850f0 | 1636 | dev_dbg(dev->class_dev, "channel/gain list too short %u < 1\n", |
88bc0574 | 1637 | cmd.chanlist_len); |
4b18f08b | 1638 | return -EINVAL; |
ed9eccbe DS |
1639 | } |
1640 | ||
88bc0574 | 1641 | async->cmd = cmd; |
ed9eccbe | 1642 | async->cmd.data = NULL; |
ed9eccbe | 1643 | |
c6cd0eef HS |
1644 | /* load channel/gain list */ |
1645 | ret = __comedi_get_user_chanlist(dev, s, user_chanlist, &async->cmd); | |
1646 | if (ret) | |
ed9eccbe | 1647 | goto cleanup; |
ed9eccbe DS |
1648 | |
1649 | ret = s->do_cmdtest(dev, s, &async->cmd); | |
1650 | ||
b0446a21 | 1651 | if (async->cmd.flags & CMDF_BOGUS || ret) { |
272850f0 | 1652 | dev_dbg(dev->class_dev, "test returned %d\n", ret); |
88bc0574 | 1653 | cmd = async->cmd; |
476b8477 | 1654 | /* restore chanlist pointer before copying back */ |
95bc359f | 1655 | cmd.chanlist = (unsigned int __force *)user_chanlist; |
88bc0574 | 1656 | cmd.data = NULL; |
bc252fd1 | 1657 | if (copy_to_user(arg, &cmd, sizeof(cmd))) { |
272850f0 | 1658 | dev_dbg(dev->class_dev, "fault writing cmd\n"); |
ed9eccbe DS |
1659 | ret = -EFAULT; |
1660 | goto cleanup; | |
1661 | } | |
1662 | ret = -EAGAIN; | |
1663 | goto cleanup; | |
1664 | } | |
1665 | ||
1666 | if (!async->prealloc_bufsz) { | |
1667 | ret = -ENOMEM; | |
272850f0 | 1668 | dev_dbg(dev->class_dev, "no buffer (?)\n"); |
ed9eccbe DS |
1669 | goto cleanup; |
1670 | } | |
1671 | ||
fcc18a9a | 1672 | comedi_buf_reset(s); |
ed9eccbe | 1673 | |
781f933c | 1674 | async->cb_mask = COMEDI_CB_BLOCK | COMEDI_CB_CANCEL_MASK; |
d8bff6e3 | 1675 | if (async->cmd.flags & CMDF_WAKE_EOS) |
ed9eccbe | 1676 | async->cb_mask |= COMEDI_CB_EOS; |
ed9eccbe | 1677 | |
84bb0bcc HS |
1678 | comedi_set_subdevice_runflags(s, COMEDI_SRF_BUSY_MASK, |
1679 | COMEDI_SRF_RUNNING); | |
ed9eccbe | 1680 | |
84bb0bcc HS |
1681 | /* |
1682 | * Set s->busy _after_ setting COMEDI_SRF_RUNNING flag to avoid | |
1683 | * race with comedi_read() or comedi_write(). | |
1684 | */ | |
4b18f08b | 1685 | s->busy = file; |
ed9eccbe DS |
1686 | ret = s->do_cmd(dev, s); |
1687 | if (ret == 0) | |
1688 | return 0; | |
1689 | ||
476b8477 | 1690 | cleanup: |
ed9eccbe DS |
1691 | do_become_nonbusy(dev, s); |
1692 | ||
1693 | return ret; | |
1694 | } | |
1695 | ||
1696 | /* | |
18e01b24 IA |
1697 | * COMEDI_CMDTEST ioctl |
1698 | * asynchronous aquisition command testing | |
1699 | * | |
1700 | * arg: | |
1701 | * pointer to comedi_cmd structure | |
1702 | * | |
1703 | * reads: | |
1704 | * comedi_cmd structure | |
1705 | * channel/range list from cmd->chanlist pointer | |
1706 | * | |
1707 | * writes: | |
1708 | * possibly modified comedi_cmd structure | |
1709 | */ | |
92d0127c GKH |
1710 | static int do_cmdtest_ioctl(struct comedi_device *dev, |
1711 | struct comedi_cmd __user *arg, void *file) | |
ed9eccbe | 1712 | { |
f8348677 | 1713 | struct comedi_cmd cmd; |
34c43922 | 1714 | struct comedi_subdevice *s; |
95bc359f | 1715 | unsigned int __user *user_chanlist; |
87ece583 HS |
1716 | int ret; |
1717 | ||
1718 | /* get the user's cmd and do some simple validation */ | |
1719 | ret = __comedi_get_user_cmd(dev, arg, &cmd); | |
1720 | if (ret) | |
1721 | return ret; | |
ed9eccbe | 1722 | |
476b8477 | 1723 | /* save user's chanlist pointer so it can be restored later */ |
95bc359f | 1724 | user_chanlist = (unsigned int __user *)cmd.chanlist; |
ed9eccbe | 1725 | |
f8348677 | 1726 | s = &dev->subdevices[cmd.subdev]; |
ed9eccbe | 1727 | |
6cab7a37 IA |
1728 | /* user_chanlist can be NULL for COMEDI_CMDTEST ioctl */ |
1729 | if (user_chanlist) { | |
1730 | /* load channel/gain list */ | |
1731 | ret = __comedi_get_user_chanlist(dev, s, user_chanlist, &cmd); | |
1732 | if (ret) | |
1733 | return ret; | |
1734 | } | |
ed9eccbe | 1735 | |
f8348677 | 1736 | ret = s->do_cmdtest(dev, s, &cmd); |
ed9eccbe | 1737 | |
238b5ad8 IA |
1738 | kfree(cmd.chanlist); /* free kernel copy of user chanlist */ |
1739 | ||
476b8477 | 1740 | /* restore chanlist pointer before copying back */ |
95bc359f | 1741 | cmd.chanlist = (unsigned int __force *)user_chanlist; |
ed9eccbe | 1742 | |
bc252fd1 | 1743 | if (copy_to_user(arg, &cmd, sizeof(cmd))) { |
272850f0 | 1744 | dev_dbg(dev->class_dev, "bad cmd address\n"); |
ed9eccbe | 1745 | ret = -EFAULT; |
ed9eccbe | 1746 | } |
c6cd0eef | 1747 | |
ed9eccbe DS |
1748 | return ret; |
1749 | } | |
1750 | ||
1751 | /* | |
18e01b24 IA |
1752 | * COMEDI_LOCK ioctl |
1753 | * lock subdevice | |
1754 | * | |
1755 | * arg: | |
1756 | * subdevice number | |
1757 | * | |
1758 | * reads: | |
1759 | * nothing | |
1760 | * | |
1761 | * writes: | |
1762 | * nothing | |
1763 | */ | |
c1a6eac1 | 1764 | static int do_lock_ioctl(struct comedi_device *dev, unsigned long arg, |
0a85b6f0 | 1765 | void *file) |
ed9eccbe DS |
1766 | { |
1767 | int ret = 0; | |
1768 | unsigned long flags; | |
34c43922 | 1769 | struct comedi_subdevice *s; |
ed9eccbe DS |
1770 | |
1771 | if (arg >= dev->n_subdevices) | |
1772 | return -EINVAL; | |
b077f2cd | 1773 | s = &dev->subdevices[arg]; |
ed9eccbe | 1774 | |
5f74ea14 | 1775 | spin_lock_irqsave(&s->spin_lock, flags); |
476b8477 | 1776 | if (s->busy || s->lock) |
ed9eccbe | 1777 | ret = -EBUSY; |
476b8477 | 1778 | else |
ed9eccbe | 1779 | s->lock = file; |
5f74ea14 | 1780 | spin_unlock_irqrestore(&s->spin_lock, flags); |
ed9eccbe | 1781 | |
ed9eccbe DS |
1782 | return ret; |
1783 | } | |
1784 | ||
1785 | /* | |
18e01b24 IA |
1786 | * COMEDI_UNLOCK ioctl |
1787 | * unlock subdevice | |
1788 | * | |
1789 | * arg: | |
1790 | * subdevice number | |
1791 | * | |
1792 | * reads: | |
1793 | * nothing | |
1794 | * | |
1795 | * writes: | |
1796 | * nothing | |
1797 | */ | |
c1a6eac1 | 1798 | static int do_unlock_ioctl(struct comedi_device *dev, unsigned long arg, |
0a85b6f0 | 1799 | void *file) |
ed9eccbe | 1800 | { |
34c43922 | 1801 | struct comedi_subdevice *s; |
ed9eccbe DS |
1802 | |
1803 | if (arg >= dev->n_subdevices) | |
1804 | return -EINVAL; | |
b077f2cd | 1805 | s = &dev->subdevices[arg]; |
ed9eccbe DS |
1806 | |
1807 | if (s->busy) | |
1808 | return -EBUSY; | |
1809 | ||
1810 | if (s->lock && s->lock != file) | |
1811 | return -EACCES; | |
1812 | ||
90ac0764 | 1813 | if (s->lock == file) |
ed9eccbe | 1814 | s->lock = NULL; |
ed9eccbe DS |
1815 | |
1816 | return 0; | |
1817 | } | |
1818 | ||
1819 | /* | |
18e01b24 IA |
1820 | * COMEDI_CANCEL ioctl |
1821 | * cancel asynchronous acquisition | |
1822 | * | |
1823 | * arg: | |
1824 | * subdevice number | |
1825 | * | |
1826 | * reads: | |
1827 | * nothing | |
1828 | * | |
1829 | * writes: | |
1830 | * nothing | |
1831 | */ | |
c1a6eac1 | 1832 | static int do_cancel_ioctl(struct comedi_device *dev, unsigned long arg, |
0a85b6f0 | 1833 | void *file) |
ed9eccbe | 1834 | { |
34c43922 | 1835 | struct comedi_subdevice *s; |
ed9eccbe DS |
1836 | |
1837 | if (arg >= dev->n_subdevices) | |
1838 | return -EINVAL; | |
b077f2cd | 1839 | s = &dev->subdevices[arg]; |
ed9eccbe DS |
1840 | if (s->async == NULL) |
1841 | return -EINVAL; | |
1842 | ||
ed9eccbe DS |
1843 | if (!s->busy) |
1844 | return 0; | |
1845 | ||
1846 | if (s->busy != file) | |
1847 | return -EBUSY; | |
1848 | ||
fe43ec53 | 1849 | return do_cancel(dev, s); |
ed9eccbe DS |
1850 | } |
1851 | ||
1852 | /* | |
18e01b24 IA |
1853 | * COMEDI_POLL ioctl |
1854 | * instructs driver to synchronize buffers | |
1855 | * | |
1856 | * arg: | |
1857 | * subdevice number | |
1858 | * | |
1859 | * reads: | |
1860 | * nothing | |
1861 | * | |
1862 | * writes: | |
1863 | * nothing | |
1864 | */ | |
c1a6eac1 | 1865 | static int do_poll_ioctl(struct comedi_device *dev, unsigned long arg, |
0a85b6f0 | 1866 | void *file) |
ed9eccbe | 1867 | { |
34c43922 | 1868 | struct comedi_subdevice *s; |
ed9eccbe DS |
1869 | |
1870 | if (arg >= dev->n_subdevices) | |
1871 | return -EINVAL; | |
b077f2cd | 1872 | s = &dev->subdevices[arg]; |
ed9eccbe | 1873 | |
ed9eccbe DS |
1874 | if (!s->busy) |
1875 | return 0; | |
1876 | ||
1877 | if (s->busy != file) | |
1878 | return -EBUSY; | |
1879 | ||
1880 | if (s->poll) | |
1881 | return s->poll(dev, s); | |
1882 | ||
1883 | return -EINVAL; | |
1884 | } | |
1885 | ||
c299a678 IA |
1886 | /* |
1887 | * COMEDI_SETRSUBD ioctl | |
1888 | * sets the current "read" subdevice on a per-file basis | |
1889 | * | |
1890 | * arg: | |
1891 | * subdevice number | |
1892 | * | |
1893 | * reads: | |
1894 | * nothing | |
1895 | * | |
1896 | * writes: | |
1897 | * nothing | |
1898 | */ | |
1899 | static int do_setrsubd_ioctl(struct comedi_device *dev, unsigned long arg, | |
1900 | struct file *file) | |
1901 | { | |
1902 | struct comedi_file *cfp = file->private_data; | |
1903 | struct comedi_subdevice *s_old, *s_new; | |
1904 | ||
1905 | if (arg >= dev->n_subdevices) | |
1906 | return -EINVAL; | |
1907 | ||
1908 | s_new = &dev->subdevices[arg]; | |
1909 | s_old = comedi_file_read_subdevice(file); | |
1910 | if (s_old == s_new) | |
1911 | return 0; /* no change */ | |
1912 | ||
1913 | if (!(s_new->subdev_flags & SDF_CMD_READ)) | |
1914 | return -EINVAL; | |
1915 | ||
1916 | /* | |
1917 | * Check the file isn't still busy handling a "read" command on the | |
1918 | * old subdevice (if any). | |
1919 | */ | |
1920 | if (s_old && s_old->busy == file && s_old->async && | |
1921 | !(s_old->async->cmd.flags & CMDF_WRITE)) | |
1922 | return -EBUSY; | |
1923 | ||
1924 | ACCESS_ONCE(cfp->read_subdev) = s_new; | |
1925 | return 0; | |
1926 | } | |
1927 | ||
1928 | /* | |
1929 | * COMEDI_SETWSUBD ioctl | |
1930 | * sets the current "write" subdevice on a per-file basis | |
1931 | * | |
1932 | * arg: | |
1933 | * subdevice number | |
1934 | * | |
1935 | * reads: | |
1936 | * nothing | |
1937 | * | |
1938 | * writes: | |
1939 | * nothing | |
1940 | */ | |
1941 | static int do_setwsubd_ioctl(struct comedi_device *dev, unsigned long arg, | |
1942 | struct file *file) | |
1943 | { | |
1944 | struct comedi_file *cfp = file->private_data; | |
1945 | struct comedi_subdevice *s_old, *s_new; | |
1946 | ||
1947 | if (arg >= dev->n_subdevices) | |
1948 | return -EINVAL; | |
1949 | ||
1950 | s_new = &dev->subdevices[arg]; | |
1951 | s_old = comedi_file_write_subdevice(file); | |
1952 | if (s_old == s_new) | |
1953 | return 0; /* no change */ | |
1954 | ||
1955 | if (!(s_new->subdev_flags & SDF_CMD_WRITE)) | |
1956 | return -EINVAL; | |
1957 | ||
1958 | /* | |
1959 | * Check the file isn't still busy handling a "write" command on the | |
1960 | * old subdevice (if any). | |
1961 | */ | |
1962 | if (s_old && s_old->busy == file && s_old->async && | |
1963 | (s_old->async->cmd.flags & CMDF_WRITE)) | |
1964 | return -EBUSY; | |
1965 | ||
1966 | ACCESS_ONCE(cfp->write_subdev) = s_new; | |
1967 | return 0; | |
1968 | } | |
1969 | ||
47db6d58 HS |
1970 | static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd, |
1971 | unsigned long arg) | |
1972 | { | |
20f083c0 IA |
1973 | unsigned minor = iminor(file_inode(file)); |
1974 | struct comedi_file *cfp = file->private_data; | |
1975 | struct comedi_device *dev = cfp->dev; | |
47db6d58 HS |
1976 | int rc; |
1977 | ||
47db6d58 HS |
1978 | mutex_lock(&dev->mutex); |
1979 | ||
1980 | /* Device config is special, because it must work on | |
1981 | * an unconfigured device. */ | |
1982 | if (cmd == COMEDI_DEVCONFIG) { | |
754ab5c0 IA |
1983 | if (minor >= COMEDI_NUM_BOARD_MINORS) { |
1984 | /* Device config not appropriate on non-board minors. */ | |
1985 | rc = -ENOTTY; | |
1986 | goto done; | |
1987 | } | |
47db6d58 HS |
1988 | rc = do_devconfig_ioctl(dev, |
1989 | (struct comedi_devconfig __user *)arg); | |
8ab4ed6e IA |
1990 | if (rc == 0) { |
1991 | if (arg == 0 && | |
1992 | dev->minor >= comedi_num_legacy_minors) { | |
1993 | /* Successfully unconfigured a dynamically | |
1994 | * allocated device. Try and remove it. */ | |
db210da2 | 1995 | if (comedi_clear_board_dev(dev)) { |
8ab4ed6e | 1996 | mutex_unlock(&dev->mutex); |
cb6b79de | 1997 | comedi_free_board_dev(dev); |
8ab4ed6e IA |
1998 | return rc; |
1999 | } | |
2000 | } | |
2001 | } | |
47db6d58 HS |
2002 | goto done; |
2003 | } | |
2004 | ||
2005 | if (!dev->attached) { | |
272850f0 | 2006 | dev_dbg(dev->class_dev, "no driver attached\n"); |
47db6d58 HS |
2007 | rc = -ENODEV; |
2008 | goto done; | |
2009 | } | |
2010 | ||
2011 | switch (cmd) { | |
2012 | case COMEDI_BUFCONFIG: | |
2013 | rc = do_bufconfig_ioctl(dev, | |
2014 | (struct comedi_bufconfig __user *)arg); | |
2015 | break; | |
2016 | case COMEDI_DEVINFO: | |
2017 | rc = do_devinfo_ioctl(dev, (struct comedi_devinfo __user *)arg, | |
2018 | file); | |
2019 | break; | |
2020 | case COMEDI_SUBDINFO: | |
2021 | rc = do_subdinfo_ioctl(dev, | |
2022 | (struct comedi_subdinfo __user *)arg, | |
2023 | file); | |
2024 | break; | |
2025 | case COMEDI_CHANINFO: | |
2026 | rc = do_chaninfo_ioctl(dev, (void __user *)arg); | |
2027 | break; | |
2028 | case COMEDI_RANGEINFO: | |
2029 | rc = do_rangeinfo_ioctl(dev, (void __user *)arg); | |
2030 | break; | |
2031 | case COMEDI_BUFINFO: | |
2032 | rc = do_bufinfo_ioctl(dev, | |
2033 | (struct comedi_bufinfo __user *)arg, | |
2034 | file); | |
2035 | break; | |
2036 | case COMEDI_LOCK: | |
2037 | rc = do_lock_ioctl(dev, arg, file); | |
2038 | break; | |
2039 | case COMEDI_UNLOCK: | |
2040 | rc = do_unlock_ioctl(dev, arg, file); | |
2041 | break; | |
2042 | case COMEDI_CANCEL: | |
2043 | rc = do_cancel_ioctl(dev, arg, file); | |
2044 | break; | |
2045 | case COMEDI_CMD: | |
2046 | rc = do_cmd_ioctl(dev, (struct comedi_cmd __user *)arg, file); | |
2047 | break; | |
2048 | case COMEDI_CMDTEST: | |
2049 | rc = do_cmdtest_ioctl(dev, (struct comedi_cmd __user *)arg, | |
2050 | file); | |
2051 | break; | |
2052 | case COMEDI_INSNLIST: | |
2053 | rc = do_insnlist_ioctl(dev, | |
2054 | (struct comedi_insnlist __user *)arg, | |
2055 | file); | |
2056 | break; | |
2057 | case COMEDI_INSN: | |
2058 | rc = do_insn_ioctl(dev, (struct comedi_insn __user *)arg, | |
2059 | file); | |
2060 | break; | |
2061 | case COMEDI_POLL: | |
2062 | rc = do_poll_ioctl(dev, arg, file); | |
2063 | break; | |
c299a678 IA |
2064 | case COMEDI_SETRSUBD: |
2065 | rc = do_setrsubd_ioctl(dev, arg, file); | |
2066 | break; | |
2067 | case COMEDI_SETWSUBD: | |
2068 | rc = do_setwsubd_ioctl(dev, arg, file); | |
2069 | break; | |
47db6d58 HS |
2070 | default: |
2071 | rc = -ENOTTY; | |
2072 | break; | |
2073 | } | |
2074 | ||
2075 | done: | |
2076 | mutex_unlock(&dev->mutex); | |
2077 | return rc; | |
2078 | } | |
2079 | ||
df30b21c FV |
2080 | static void comedi_vm_open(struct vm_area_struct *area) |
2081 | { | |
af93da31 | 2082 | struct comedi_buf_map *bm; |
df30b21c | 2083 | |
af93da31 IA |
2084 | bm = area->vm_private_data; |
2085 | comedi_buf_map_get(bm); | |
df30b21c FV |
2086 | } |
2087 | ||
2088 | static void comedi_vm_close(struct vm_area_struct *area) | |
ed9eccbe | 2089 | { |
af93da31 | 2090 | struct comedi_buf_map *bm; |
ed9eccbe | 2091 | |
af93da31 IA |
2092 | bm = area->vm_private_data; |
2093 | comedi_buf_map_put(bm); | |
ed9eccbe DS |
2094 | } |
2095 | ||
2096 | static struct vm_operations_struct comedi_vm_ops = { | |
df30b21c FV |
2097 | .open = comedi_vm_open, |
2098 | .close = comedi_vm_close, | |
ed9eccbe DS |
2099 | }; |
2100 | ||
2101 | static int comedi_mmap(struct file *file, struct vm_area_struct *vma) | |
2102 | { | |
20f083c0 IA |
2103 | struct comedi_file *cfp = file->private_data; |
2104 | struct comedi_device *dev = cfp->dev; | |
a52840a9 HS |
2105 | struct comedi_subdevice *s; |
2106 | struct comedi_async *async; | |
b34aa86f | 2107 | struct comedi_buf_map *bm = NULL; |
ed9eccbe DS |
2108 | unsigned long start = vma->vm_start; |
2109 | unsigned long size; | |
2110 | int n_pages; | |
2111 | int i; | |
2112 | int retval; | |
3ffab428 | 2113 | |
b34aa86f IA |
2114 | /* |
2115 | * 'trylock' avoids circular dependency with current->mm->mmap_sem | |
2116 | * and down-reading &dev->attach_lock should normally succeed without | |
2117 | * contention unless the device is in the process of being attached | |
2118 | * or detached. | |
2119 | */ | |
2120 | if (!down_read_trylock(&dev->attach_lock)) | |
2121 | return -EAGAIN; | |
a52840a9 | 2122 | |
ed9eccbe | 2123 | if (!dev->attached) { |
272850f0 | 2124 | dev_dbg(dev->class_dev, "no driver attached\n"); |
ed9eccbe DS |
2125 | retval = -ENODEV; |
2126 | goto done; | |
2127 | } | |
a52840a9 | 2128 | |
476b8477 | 2129 | if (vma->vm_flags & VM_WRITE) |
20f083c0 | 2130 | s = comedi_file_write_subdevice(file); |
476b8477 | 2131 | else |
20f083c0 | 2132 | s = comedi_file_read_subdevice(file); |
a52840a9 | 2133 | if (!s) { |
ed9eccbe DS |
2134 | retval = -EINVAL; |
2135 | goto done; | |
2136 | } | |
a52840a9 | 2137 | |
ed9eccbe | 2138 | async = s->async; |
a52840a9 | 2139 | if (!async) { |
ed9eccbe DS |
2140 | retval = -EINVAL; |
2141 | goto done; | |
2142 | } | |
2143 | ||
2144 | if (vma->vm_pgoff != 0) { | |
272850f0 | 2145 | dev_dbg(dev->class_dev, "mmap() offset must be 0.\n"); |
ed9eccbe DS |
2146 | retval = -EINVAL; |
2147 | goto done; | |
2148 | } | |
2149 | ||
2150 | size = vma->vm_end - vma->vm_start; | |
2151 | if (size > async->prealloc_bufsz) { | |
2152 | retval = -EFAULT; | |
2153 | goto done; | |
2154 | } | |
2155 | if (size & (~PAGE_MASK)) { | |
2156 | retval = -EFAULT; | |
2157 | goto done; | |
2158 | } | |
2159 | ||
2160 | n_pages = size >> PAGE_SHIFT; | |
b34aa86f IA |
2161 | |
2162 | /* get reference to current buf map (if any) */ | |
2163 | bm = comedi_buf_map_from_subdev_get(s); | |
af93da31 IA |
2164 | if (!bm || n_pages > bm->n_pages) { |
2165 | retval = -EINVAL; | |
2166 | goto done; | |
2167 | } | |
ed9eccbe | 2168 | for (i = 0; i < n_pages; ++i) { |
af93da31 | 2169 | struct comedi_buf_page *buf = &bm->page_list[i]; |
a52840a9 | 2170 | |
ed9eccbe | 2171 | if (remap_pfn_range(vma, start, |
a52840a9 HS |
2172 | page_to_pfn(virt_to_page(buf->virt_addr)), |
2173 | PAGE_SIZE, PAGE_SHARED)) { | |
ed9eccbe DS |
2174 | retval = -EAGAIN; |
2175 | goto done; | |
2176 | } | |
2177 | start += PAGE_SIZE; | |
2178 | } | |
2179 | ||
2180 | vma->vm_ops = &comedi_vm_ops; | |
af93da31 | 2181 | vma->vm_private_data = bm; |
ed9eccbe | 2182 | |
af93da31 | 2183 | vma->vm_ops->open(vma); |
ed9eccbe DS |
2184 | |
2185 | retval = 0; | |
476b8477 | 2186 | done: |
b34aa86f IA |
2187 | up_read(&dev->attach_lock); |
2188 | comedi_buf_map_put(bm); /* put reference to buf map - okay if NULL */ | |
ed9eccbe DS |
2189 | return retval; |
2190 | } | |
2191 | ||
1ae5062a | 2192 | static unsigned int comedi_poll(struct file *file, poll_table *wait) |
ed9eccbe DS |
2193 | { |
2194 | unsigned int mask = 0; | |
20f083c0 IA |
2195 | struct comedi_file *cfp = file->private_data; |
2196 | struct comedi_device *dev = cfp->dev; | |
ca081b1d | 2197 | struct comedi_subdevice *s; |
3ffab428 | 2198 | |
ed9eccbe | 2199 | mutex_lock(&dev->mutex); |
ca081b1d | 2200 | |
ed9eccbe | 2201 | if (!dev->attached) { |
272850f0 | 2202 | dev_dbg(dev->class_dev, "no driver attached\n"); |
ca081b1d | 2203 | goto done; |
ed9eccbe DS |
2204 | } |
2205 | ||
20f083c0 | 2206 | s = comedi_file_read_subdevice(file); |
cc400e18 | 2207 | if (s && s->async) { |
ca081b1d | 2208 | poll_wait(file, &s->async->wait_head, wait); |
f0124630 | 2209 | if (!s->busy || !comedi_is_subdevice_running(s) || |
662c722b | 2210 | (s->async->cmd.flags & CMDF_WRITE) || |
e9edef3a | 2211 | comedi_buf_read_n_available(s) > 0) |
ed9eccbe | 2212 | mask |= POLLIN | POLLRDNORM; |
ed9eccbe | 2213 | } |
ca081b1d | 2214 | |
20f083c0 | 2215 | s = comedi_file_write_subdevice(file); |
cc400e18 | 2216 | if (s && s->async) { |
c39e050d | 2217 | unsigned int bps = comedi_bytes_per_sample(s); |
ca081b1d HS |
2218 | |
2219 | poll_wait(file, &s->async->wait_head, wait); | |
24e894bb | 2220 | comedi_buf_write_alloc(s, s->async->prealloc_bufsz); |
f0124630 | 2221 | if (!s->busy || !comedi_is_subdevice_running(s) || |
662c722b | 2222 | !(s->async->cmd.flags & CMDF_WRITE) || |
0f1f34e8 | 2223 | comedi_buf_write_n_allocated(s) >= bps) |
ed9eccbe | 2224 | mask |= POLLOUT | POLLWRNORM; |
ed9eccbe DS |
2225 | } |
2226 | ||
ca081b1d | 2227 | done: |
ed9eccbe DS |
2228 | mutex_unlock(&dev->mutex); |
2229 | return mask; | |
2230 | } | |
2231 | ||
92d0127c GKH |
2232 | static ssize_t comedi_write(struct file *file, const char __user *buf, |
2233 | size_t nbytes, loff_t *offset) | |
ed9eccbe | 2234 | { |
34c43922 | 2235 | struct comedi_subdevice *s; |
d163679c | 2236 | struct comedi_async *async; |
ed9eccbe DS |
2237 | int n, m, count = 0, retval = 0; |
2238 | DECLARE_WAITQUEUE(wait, current); | |
20f083c0 IA |
2239 | struct comedi_file *cfp = file->private_data; |
2240 | struct comedi_device *dev = cfp->dev; | |
9329f139 IA |
2241 | bool on_wait_queue = false; |
2242 | bool attach_locked; | |
2243 | unsigned int old_detach_count; | |
3ffab428 | 2244 | |
9329f139 IA |
2245 | /* Protect against device detachment during operation. */ |
2246 | down_read(&dev->attach_lock); | |
2247 | attach_locked = true; | |
2248 | old_detach_count = dev->detach_count; | |
2249 | ||
ed9eccbe | 2250 | if (!dev->attached) { |
272850f0 | 2251 | dev_dbg(dev->class_dev, "no driver attached\n"); |
9329f139 IA |
2252 | retval = -ENODEV; |
2253 | goto out; | |
ed9eccbe DS |
2254 | } |
2255 | ||
20f083c0 | 2256 | s = comedi_file_write_subdevice(file); |
9329f139 IA |
2257 | if (!s || !s->async) { |
2258 | retval = -EIO; | |
2259 | goto out; | |
2260 | } | |
2714b019 | 2261 | |
ed9eccbe DS |
2262 | async = s->async; |
2263 | ||
2714b019 | 2264 | if (!s->busy || !nbytes) |
9329f139 IA |
2265 | goto out; |
2266 | if (s->busy != file) { | |
2267 | retval = -EACCES; | |
2268 | goto out; | |
2269 | } | |
f7398509 IA |
2270 | if (!(async->cmd.flags & CMDF_WRITE)) { |
2271 | retval = -EINVAL; | |
2272 | goto out; | |
2273 | } | |
2714b019 | 2274 | |
ed9eccbe | 2275 | add_wait_queue(&async->wait_head, &wait); |
9329f139 | 2276 | on_wait_queue = true; |
ed9eccbe DS |
2277 | while (nbytes > 0 && !retval) { |
2278 | set_current_state(TASK_INTERRUPTIBLE); | |
2279 | ||
f0124630 | 2280 | if (!comedi_is_subdevice_running(s)) { |
d2611540 | 2281 | if (count == 0) { |
9329f139 IA |
2282 | struct comedi_subdevice *new_s; |
2283 | ||
c098c21a | 2284 | if (comedi_is_subdevice_in_error(s)) |
d2611540 | 2285 | retval = -EPIPE; |
c098c21a | 2286 | else |
d2611540 | 2287 | retval = 0; |
9329f139 IA |
2288 | /* |
2289 | * To avoid deadlock, cannot acquire dev->mutex | |
2290 | * while dev->attach_lock is held. Need to | |
2291 | * remove task from the async wait queue before | |
2292 | * releasing dev->attach_lock, as it might not | |
2293 | * be valid afterwards. | |
2294 | */ | |
2295 | remove_wait_queue(&async->wait_head, &wait); | |
2296 | on_wait_queue = false; | |
2297 | up_read(&dev->attach_lock); | |
2298 | attach_locked = false; | |
2299 | mutex_lock(&dev->mutex); | |
2300 | /* | |
2301 | * Become non-busy unless things have changed | |
2302 | * behind our back. Checking dev->detach_count | |
2303 | * is unchanged ought to be sufficient (unless | |
2304 | * there have been 2**32 detaches in the | |
2305 | * meantime!), but check the subdevice pointer | |
2306 | * as well just in case. | |
2307 | */ | |
20f083c0 | 2308 | new_s = comedi_file_write_subdevice(file); |
9329f139 IA |
2309 | if (dev->attached && |
2310 | old_detach_count == dev->detach_count && | |
2311 | s == new_s && new_s->async == async) | |
2312 | do_become_nonbusy(dev, s); | |
4b18f08b | 2313 | mutex_unlock(&dev->mutex); |
d2611540 IA |
2314 | } |
2315 | break; | |
2316 | } | |
2317 | ||
ed9eccbe DS |
2318 | n = nbytes; |
2319 | ||
2320 | m = n; | |
476b8477 | 2321 | if (async->buf_write_ptr + m > async->prealloc_bufsz) |
ed9eccbe | 2322 | m = async->prealloc_bufsz - async->buf_write_ptr; |
24e894bb | 2323 | comedi_buf_write_alloc(s, async->prealloc_bufsz); |
0f1f34e8 IA |
2324 | if (m > comedi_buf_write_n_allocated(s)) |
2325 | m = comedi_buf_write_n_allocated(s); | |
ed9eccbe DS |
2326 | if (m < n) |
2327 | n = m; | |
2328 | ||
2329 | if (n == 0) { | |
ed9eccbe DS |
2330 | if (file->f_flags & O_NONBLOCK) { |
2331 | retval = -EAGAIN; | |
2332 | break; | |
2333 | } | |
6a9ce6b6 | 2334 | schedule(); |
ed9eccbe DS |
2335 | if (signal_pending(current)) { |
2336 | retval = -ERESTARTSYS; | |
2337 | break; | |
2338 | } | |
476b8477 | 2339 | if (!s->busy) |
ed9eccbe | 2340 | break; |
ed9eccbe DS |
2341 | if (s->busy != file) { |
2342 | retval = -EACCES; | |
2343 | break; | |
2344 | } | |
f7398509 IA |
2345 | if (!(async->cmd.flags & CMDF_WRITE)) { |
2346 | retval = -EINVAL; | |
2347 | break; | |
2348 | } | |
ed9eccbe DS |
2349 | continue; |
2350 | } | |
2351 | ||
2352 | m = copy_from_user(async->prealloc_buf + async->buf_write_ptr, | |
476b8477 | 2353 | buf, n); |
ed9eccbe DS |
2354 | if (m) { |
2355 | n -= m; | |
2356 | retval = -EFAULT; | |
2357 | } | |
940dd35d | 2358 | comedi_buf_write_free(s, n); |
ed9eccbe DS |
2359 | |
2360 | count += n; | |
2361 | nbytes -= n; | |
2362 | ||
2363 | buf += n; | |
2364 | break; /* makes device work like a pipe */ | |
2365 | } | |
9329f139 IA |
2366 | out: |
2367 | if (on_wait_queue) | |
2368 | remove_wait_queue(&async->wait_head, &wait); | |
ed9eccbe | 2369 | set_current_state(TASK_RUNNING); |
9329f139 IA |
2370 | if (attach_locked) |
2371 | up_read(&dev->attach_lock); | |
ed9eccbe | 2372 | |
476b8477 | 2373 | return count ? count : retval; |
ed9eccbe DS |
2374 | } |
2375 | ||
92d0127c | 2376 | static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes, |
36efbacd | 2377 | loff_t *offset) |
ed9eccbe | 2378 | { |
34c43922 | 2379 | struct comedi_subdevice *s; |
d163679c | 2380 | struct comedi_async *async; |
ed9eccbe DS |
2381 | int n, m, count = 0, retval = 0; |
2382 | DECLARE_WAITQUEUE(wait, current); | |
20f083c0 IA |
2383 | struct comedi_file *cfp = file->private_data; |
2384 | struct comedi_device *dev = cfp->dev; | |
45c2bc55 IA |
2385 | unsigned int old_detach_count; |
2386 | bool become_nonbusy = false; | |
2387 | bool attach_locked; | |
3ffab428 | 2388 | |
45c2bc55 IA |
2389 | /* Protect against device detachment during operation. */ |
2390 | down_read(&dev->attach_lock); | |
2391 | attach_locked = true; | |
2392 | old_detach_count = dev->detach_count; | |
2393 | ||
ed9eccbe | 2394 | if (!dev->attached) { |
272850f0 | 2395 | dev_dbg(dev->class_dev, "no driver attached\n"); |
45c2bc55 IA |
2396 | retval = -ENODEV; |
2397 | goto out; | |
ed9eccbe DS |
2398 | } |
2399 | ||
20f083c0 | 2400 | s = comedi_file_read_subdevice(file); |
45c2bc55 IA |
2401 | if (!s || !s->async) { |
2402 | retval = -EIO; | |
2403 | goto out; | |
2404 | } | |
5c87fef5 | 2405 | |
ed9eccbe | 2406 | async = s->async; |
5c87fef5 | 2407 | if (!s->busy || !nbytes) |
45c2bc55 IA |
2408 | goto out; |
2409 | if (s->busy != file) { | |
2410 | retval = -EACCES; | |
2411 | goto out; | |
2412 | } | |
f025ab9e IA |
2413 | if (async->cmd.flags & CMDF_WRITE) { |
2414 | retval = -EINVAL; | |
2415 | goto out; | |
2416 | } | |
ed9eccbe DS |
2417 | |
2418 | add_wait_queue(&async->wait_head, &wait); | |
2419 | while (nbytes > 0 && !retval) { | |
2420 | set_current_state(TASK_INTERRUPTIBLE); | |
2421 | ||
2422 | n = nbytes; | |
2423 | ||
e9edef3a | 2424 | m = comedi_buf_read_n_available(s); |
476b8477 | 2425 | if (async->buf_read_ptr + m > async->prealloc_bufsz) |
ed9eccbe | 2426 | m = async->prealloc_bufsz - async->buf_read_ptr; |
ed9eccbe DS |
2427 | if (m < n) |
2428 | n = m; | |
2429 | ||
2430 | if (n == 0) { | |
f0124630 | 2431 | if (!comedi_is_subdevice_running(s)) { |
c098c21a | 2432 | if (comedi_is_subdevice_in_error(s)) |
ed9eccbe | 2433 | retval = -EPIPE; |
c098c21a | 2434 | else |
ed9eccbe | 2435 | retval = 0; |
45c2bc55 | 2436 | become_nonbusy = true; |
ed9eccbe DS |
2437 | break; |
2438 | } | |
2439 | if (file->f_flags & O_NONBLOCK) { | |
2440 | retval = -EAGAIN; | |
2441 | break; | |
2442 | } | |
6a9ce6b6 | 2443 | schedule(); |
ed9eccbe DS |
2444 | if (signal_pending(current)) { |
2445 | retval = -ERESTARTSYS; | |
2446 | break; | |
2447 | } | |
ed9eccbe DS |
2448 | if (!s->busy) { |
2449 | retval = 0; | |
2450 | break; | |
2451 | } | |
2452 | if (s->busy != file) { | |
2453 | retval = -EACCES; | |
2454 | break; | |
2455 | } | |
f025ab9e IA |
2456 | if (async->cmd.flags & CMDF_WRITE) { |
2457 | retval = -EINVAL; | |
2458 | break; | |
2459 | } | |
ed9eccbe DS |
2460 | continue; |
2461 | } | |
2462 | m = copy_to_user(buf, async->prealloc_buf + | |
476b8477 | 2463 | async->buf_read_ptr, n); |
ed9eccbe DS |
2464 | if (m) { |
2465 | n -= m; | |
2466 | retval = -EFAULT; | |
2467 | } | |
2468 | ||
d13be55a | 2469 | comedi_buf_read_alloc(s, n); |
f1df8662 | 2470 | comedi_buf_read_free(s, n); |
ed9eccbe DS |
2471 | |
2472 | count += n; | |
2473 | nbytes -= n; | |
2474 | ||
2475 | buf += n; | |
2476 | break; /* makes device work like a pipe */ | |
2477 | } | |
45c2bc55 IA |
2478 | remove_wait_queue(&async->wait_head, &wait); |
2479 | set_current_state(TASK_RUNNING); | |
2480 | if (become_nonbusy || comedi_is_subdevice_idle(s)) { | |
2481 | struct comedi_subdevice *new_s; | |
2482 | ||
2483 | /* | |
2484 | * To avoid deadlock, cannot acquire dev->mutex | |
2485 | * while dev->attach_lock is held. | |
2486 | */ | |
2487 | up_read(&dev->attach_lock); | |
2488 | attach_locked = false; | |
4b18f08b | 2489 | mutex_lock(&dev->mutex); |
45c2bc55 IA |
2490 | /* |
2491 | * Check device hasn't become detached behind our back. | |
2492 | * Checking dev->detach_count is unchanged ought to be | |
2493 | * sufficient (unless there have been 2**32 detaches in the | |
2494 | * meantime!), but check the subdevice pointer as well just in | |
2495 | * case. | |
2496 | */ | |
20f083c0 | 2497 | new_s = comedi_file_read_subdevice(file); |
45c2bc55 IA |
2498 | if (dev->attached && old_detach_count == dev->detach_count && |
2499 | s == new_s && new_s->async == async) { | |
f4f3f7cf | 2500 | if (become_nonbusy || comedi_buf_n_bytes_ready(s) == 0) |
45c2bc55 IA |
2501 | do_become_nonbusy(dev, s); |
2502 | } | |
4b18f08b | 2503 | mutex_unlock(&dev->mutex); |
ed9eccbe | 2504 | } |
45c2bc55 IA |
2505 | out: |
2506 | if (attach_locked) | |
2507 | up_read(&dev->attach_lock); | |
ed9eccbe | 2508 | |
476b8477 | 2509 | return count ? count : retval; |
ed9eccbe DS |
2510 | } |
2511 | ||
ed9eccbe DS |
2512 | static int comedi_open(struct inode *inode, struct file *file) |
2513 | { | |
ed9eccbe | 2514 | const unsigned minor = iminor(inode); |
20f083c0 | 2515 | struct comedi_file *cfp; |
fc406986 IA |
2516 | struct comedi_device *dev = comedi_dev_get_from_minor(minor); |
2517 | int rc; | |
97920071 | 2518 | |
4da5fa9a | 2519 | if (!dev) { |
272850f0 | 2520 | pr_debug("invalid minor number\n"); |
ed9eccbe DS |
2521 | return -ENODEV; |
2522 | } | |
2523 | ||
20f083c0 IA |
2524 | cfp = kzalloc(sizeof(*cfp), GFP_KERNEL); |
2525 | if (!cfp) | |
2526 | return -ENOMEM; | |
2527 | ||
2528 | cfp->dev = dev; | |
2529 | ||
ed9eccbe | 2530 | mutex_lock(&dev->mutex); |
a8f80e8f | 2531 | if (!dev->attached && !capable(CAP_NET_ADMIN)) { |
272850f0 | 2532 | dev_dbg(dev->class_dev, "not attached and not CAP_NET_ADMIN\n"); |
fc406986 IA |
2533 | rc = -ENODEV; |
2534 | goto out; | |
ed9eccbe | 2535 | } |
1363e4fb | 2536 | if (dev->attached && dev->use_count == 0) { |
ed9eccbe | 2537 | if (!try_module_get(dev->driver->module)) { |
fc406986 IA |
2538 | rc = -ENOSYS; |
2539 | goto out; | |
ed9eccbe | 2540 | } |
1363e4fb IA |
2541 | if (dev->open) { |
2542 | rc = dev->open(dev); | |
2543 | if (rc < 0) { | |
2544 | module_put(dev->driver->module); | |
2545 | goto out; | |
2546 | } | |
3c17ba07 IA |
2547 | } |
2548 | } | |
ed9eccbe DS |
2549 | |
2550 | dev->use_count++; | |
20f083c0 IA |
2551 | file->private_data = cfp; |
2552 | comedi_file_reset(file); | |
fc406986 | 2553 | rc = 0; |
ed9eccbe | 2554 | |
fc406986 | 2555 | out: |
a5011a26 | 2556 | mutex_unlock(&dev->mutex); |
20f083c0 | 2557 | if (rc) { |
fc406986 | 2558 | comedi_dev_put(dev); |
20f083c0 IA |
2559 | kfree(cfp); |
2560 | } | |
fc406986 | 2561 | return rc; |
ed9eccbe DS |
2562 | } |
2563 | ||
2aae0076 HS |
2564 | static int comedi_fasync(int fd, struct file *file, int on) |
2565 | { | |
20f083c0 IA |
2566 | struct comedi_file *cfp = file->private_data; |
2567 | struct comedi_device *dev = cfp->dev; | |
2aae0076 HS |
2568 | |
2569 | return fasync_helper(fd, file, on, &dev->async_queue); | |
2570 | } | |
2571 | ||
a5011a26 | 2572 | static int comedi_close(struct inode *inode, struct file *file) |
ed9eccbe | 2573 | { |
20f083c0 IA |
2574 | struct comedi_file *cfp = file->private_data; |
2575 | struct comedi_device *dev = cfp->dev; | |
a5011a26 | 2576 | struct comedi_subdevice *s = NULL; |
ed9eccbe DS |
2577 | int i; |
2578 | ||
a5011a26 HS |
2579 | mutex_lock(&dev->mutex); |
2580 | ||
2581 | if (dev->subdevices) { | |
2582 | for (i = 0; i < dev->n_subdevices; i++) { | |
b077f2cd | 2583 | s = &dev->subdevices[i]; |
a5011a26 HS |
2584 | |
2585 | if (s->busy == file) | |
2586 | do_cancel(dev, s); | |
2587 | if (s->lock == file) | |
2588 | s->lock = NULL; | |
2589 | } | |
ed9eccbe | 2590 | } |
1363e4fb IA |
2591 | if (dev->attached && dev->use_count == 1) { |
2592 | if (dev->close) | |
2593 | dev->close(dev); | |
a5011a26 | 2594 | module_put(dev->driver->module); |
1363e4fb | 2595 | } |
a5011a26 HS |
2596 | |
2597 | dev->use_count--; | |
2598 | ||
2599 | mutex_unlock(&dev->mutex); | |
fc406986 | 2600 | comedi_dev_put(dev); |
20f083c0 | 2601 | kfree(cfp); |
a5011a26 | 2602 | |
ed9eccbe DS |
2603 | return 0; |
2604 | } | |
2605 | ||
8cb8aad7 | 2606 | static const struct file_operations comedi_fops = { |
a5011a26 HS |
2607 | .owner = THIS_MODULE, |
2608 | .unlocked_ioctl = comedi_unlocked_ioctl, | |
2609 | .compat_ioctl = comedi_compat_ioctl, | |
2610 | .open = comedi_open, | |
2611 | .release = comedi_close, | |
2612 | .read = comedi_read, | |
2613 | .write = comedi_write, | |
2614 | .mmap = comedi_mmap, | |
2615 | .poll = comedi_poll, | |
2616 | .fasync = comedi_fasync, | |
2617 | .llseek = noop_llseek, | |
2618 | }; | |
2619 | ||
dd630cde IA |
2620 | /** |
2621 | * comedi_event - handle events for asynchronous comedi command | |
2622 | * @dev: comedi_device struct | |
2623 | * @s: comedi_subdevice struct associated with dev | |
2624 | * Context: interrupt (usually), s->spin_lock spin-lock not held | |
2625 | * | |
2626 | * If an asynchronous comedi command is active on the subdevice, process | |
2627 | * any COMEDI_CB_... event flags that have been set, usually by an | |
2628 | * interrupt handler. These may change the run state of the asynchronous | |
2629 | * command, wake a task, and/or send a SIGIO signal. | |
2630 | */ | |
a5011a26 | 2631 | void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s) |
883db3d9 | 2632 | { |
a5011a26 HS |
2633 | struct comedi_async *async = s->async; |
2634 | unsigned runflags = 0; | |
2635 | unsigned runflags_mask = 0; | |
883db3d9 | 2636 | |
f0124630 | 2637 | if (!comedi_is_subdevice_running(s)) |
a5011a26 HS |
2638 | return; |
2639 | ||
781f933c | 2640 | if (s->async->events & COMEDI_CB_CANCEL_MASK) |
84bb0bcc | 2641 | runflags_mask |= COMEDI_SRF_RUNNING; |
781f933c HS |
2642 | |
2643 | /* | |
2644 | * Remember if an error event has occurred, so an error | |
2645 | * can be returned the next time the user does a read(). | |
2646 | */ | |
2647 | if (s->async->events & COMEDI_CB_ERROR_MASK) { | |
84bb0bcc HS |
2648 | runflags_mask |= COMEDI_SRF_ERROR; |
2649 | runflags |= COMEDI_SRF_ERROR; | |
883db3d9 | 2650 | } |
a5011a26 | 2651 | if (runflags_mask) { |
84bb0bcc HS |
2652 | /* |
2653 | * Sets COMEDI_SRF_ERROR and COMEDI_SRF_RUNNING together | |
2654 | * atomically. | |
2655 | */ | |
a5011a26 | 2656 | comedi_set_subdevice_runflags(s, runflags_mask, runflags); |
883db3d9 FMH |
2657 | } |
2658 | ||
a5011a26 | 2659 | if (async->cb_mask & s->async->events) { |
c265be01 IA |
2660 | wake_up_interruptible(&async->wait_head); |
2661 | if (s->subdev_flags & SDF_CMD_READ) | |
2662 | kill_fasync(&dev->async_queue, SIGIO, POLL_IN); | |
2663 | if (s->subdev_flags & SDF_CMD_WRITE) | |
2664 | kill_fasync(&dev->async_queue, SIGIO, POLL_OUT); | |
a5011a26 HS |
2665 | } |
2666 | s->async->events = 0; | |
883db3d9 | 2667 | } |
5660e742 | 2668 | EXPORT_SYMBOL_GPL(comedi_event); |
883db3d9 | 2669 | |
07778393 | 2670 | /* Note: the ->mutex is pre-locked on successful return */ |
7638ffcb | 2671 | struct comedi_device *comedi_alloc_board_minor(struct device *hardware_device) |
a5011a26 | 2672 | { |
7638ffcb | 2673 | struct comedi_device *dev; |
a5011a26 HS |
2674 | struct device *csdev; |
2675 | unsigned i; | |
a5011a26 | 2676 | |
36efbacd | 2677 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
cb6b79de | 2678 | if (dev == NULL) |
7638ffcb | 2679 | return ERR_PTR(-ENOMEM); |
7638ffcb | 2680 | comedi_device_init(dev); |
db2e3487 | 2681 | comedi_set_hw_dev(dev, hardware_device); |
07778393 | 2682 | mutex_lock(&dev->mutex); |
5b7dba1b | 2683 | mutex_lock(&comedi_board_minor_table_lock); |
38b9722a IA |
2684 | for (i = hardware_device ? comedi_num_legacy_minors : 0; |
2685 | i < COMEDI_NUM_BOARD_MINORS; ++i) { | |
5b7dba1b | 2686 | if (comedi_board_minor_table[i] == NULL) { |
cb6b79de | 2687 | comedi_board_minor_table[i] = dev; |
a5011a26 HS |
2688 | break; |
2689 | } | |
2690 | } | |
5b7dba1b | 2691 | mutex_unlock(&comedi_board_minor_table_lock); |
a5011a26 | 2692 | if (i == COMEDI_NUM_BOARD_MINORS) { |
07778393 | 2693 | mutex_unlock(&dev->mutex); |
7638ffcb | 2694 | comedi_device_cleanup(dev); |
5b13ed94 | 2695 | comedi_dev_put(dev); |
c2ad078b | 2696 | pr_err("ran out of minor numbers for board device files\n"); |
7638ffcb | 2697 | return ERR_PTR(-EBUSY); |
a5011a26 | 2698 | } |
7638ffcb | 2699 | dev->minor = i; |
a5011a26 HS |
2700 | csdev = device_create(comedi_class, hardware_device, |
2701 | MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i", i); | |
2702 | if (!IS_ERR(csdev)) | |
8f988d87 | 2703 | dev->class_dev = get_device(csdev); |
883db3d9 | 2704 | |
07778393 | 2705 | /* Note: dev->mutex needs to be unlocked by the caller. */ |
7638ffcb | 2706 | return dev; |
883db3d9 FMH |
2707 | } |
2708 | ||
70f30c37 | 2709 | static void comedi_free_board_minor(unsigned minor) |
24fb134d IA |
2710 | { |
2711 | BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS); | |
cb6b79de | 2712 | comedi_free_board_dev(comedi_clear_board_minor(minor)); |
24fb134d IA |
2713 | } |
2714 | ||
3346b798 | 2715 | void comedi_release_hardware_device(struct device *hardware_device) |
883db3d9 | 2716 | { |
a5011a26 | 2717 | int minor; |
cb6b79de | 2718 | struct comedi_device *dev; |
883db3d9 | 2719 | |
38b9722a IA |
2720 | for (minor = comedi_num_legacy_minors; minor < COMEDI_NUM_BOARD_MINORS; |
2721 | minor++) { | |
5b7dba1b | 2722 | mutex_lock(&comedi_board_minor_table_lock); |
cb6b79de IA |
2723 | dev = comedi_board_minor_table[minor]; |
2724 | if (dev && dev->hw_dev == hardware_device) { | |
5b7dba1b IA |
2725 | comedi_board_minor_table[minor] = NULL; |
2726 | mutex_unlock(&comedi_board_minor_table_lock); | |
cb6b79de | 2727 | comedi_free_board_dev(dev); |
3346b798 | 2728 | break; |
a5011a26 | 2729 | } |
5b7dba1b | 2730 | mutex_unlock(&comedi_board_minor_table_lock); |
883db3d9 | 2731 | } |
883db3d9 FMH |
2732 | } |
2733 | ||
f65cc544 | 2734 | int comedi_alloc_subdevice_minor(struct comedi_subdevice *s) |
883db3d9 | 2735 | { |
f65cc544 | 2736 | struct comedi_device *dev = s->device; |
a5011a26 HS |
2737 | struct device *csdev; |
2738 | unsigned i; | |
883db3d9 | 2739 | |
5b7dba1b IA |
2740 | mutex_lock(&comedi_subdevice_minor_table_lock); |
2741 | for (i = 0; i < COMEDI_NUM_SUBDEVICE_MINORS; ++i) { | |
2742 | if (comedi_subdevice_minor_table[i] == NULL) { | |
bd5b4173 | 2743 | comedi_subdevice_minor_table[i] = s; |
a5011a26 HS |
2744 | break; |
2745 | } | |
2746 | } | |
5b7dba1b IA |
2747 | mutex_unlock(&comedi_subdevice_minor_table_lock); |
2748 | if (i == COMEDI_NUM_SUBDEVICE_MINORS) { | |
c2ad078b | 2749 | pr_err("ran out of minor numbers for subdevice files\n"); |
a5011a26 HS |
2750 | return -EBUSY; |
2751 | } | |
5b7dba1b | 2752 | i += COMEDI_NUM_BOARD_MINORS; |
a5011a26 HS |
2753 | s->minor = i; |
2754 | csdev = device_create(comedi_class, dev->class_dev, | |
2755 | MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i_subd%i", | |
90a35c15 | 2756 | dev->minor, s->index); |
a5011a26 HS |
2757 | if (!IS_ERR(csdev)) |
2758 | s->class_dev = csdev; | |
883db3d9 | 2759 | |
da718546 | 2760 | return 0; |
883db3d9 FMH |
2761 | } |
2762 | ||
a5011a26 | 2763 | void comedi_free_subdevice_minor(struct comedi_subdevice *s) |
883db3d9 | 2764 | { |
0fcc9d48 | 2765 | unsigned int i; |
883db3d9 | 2766 | |
a5011a26 HS |
2767 | if (s == NULL) |
2768 | return; | |
2769 | if (s->minor < 0) | |
2770 | return; | |
883db3d9 | 2771 | |
a5011a26 | 2772 | BUG_ON(s->minor >= COMEDI_NUM_MINORS); |
8907cf6c | 2773 | BUG_ON(s->minor < COMEDI_NUM_BOARD_MINORS); |
883db3d9 | 2774 | |
0fcc9d48 IA |
2775 | i = s->minor - COMEDI_NUM_BOARD_MINORS; |
2776 | mutex_lock(&comedi_subdevice_minor_table_lock); | |
bd5b4173 IA |
2777 | if (s == comedi_subdevice_minor_table[i]) |
2778 | comedi_subdevice_minor_table[i] = NULL; | |
0fcc9d48 | 2779 | mutex_unlock(&comedi_subdevice_minor_table_lock); |
a5011a26 HS |
2780 | if (s->class_dev) { |
2781 | device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor)); | |
2782 | s->class_dev = NULL; | |
883db3d9 | 2783 | } |
883db3d9 | 2784 | } |
a5787824 | 2785 | |
682b9119 | 2786 | static void comedi_cleanup_board_minors(void) |
76cca89f HS |
2787 | { |
2788 | unsigned i; | |
2789 | ||
682b9119 | 2790 | for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) |
76cca89f HS |
2791 | comedi_free_board_minor(i); |
2792 | } | |
2793 | ||
91fa0b0c HS |
2794 | static int __init comedi_init(void) |
2795 | { | |
2796 | int i; | |
2797 | int retval; | |
2798 | ||
c2ad078b | 2799 | pr_info("version " COMEDI_RELEASE " - http://www.comedi.org\n"); |
91fa0b0c HS |
2800 | |
2801 | if (comedi_num_legacy_minors < 0 || | |
2802 | comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) { | |
c2ad078b | 2803 | pr_err("invalid value for module parameter \"comedi_num_legacy_minors\". Valid values are 0 through %i.\n", |
91fa0b0c HS |
2804 | COMEDI_NUM_BOARD_MINORS); |
2805 | return -EINVAL; | |
2806 | } | |
2807 | ||
91fa0b0c HS |
2808 | retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0), |
2809 | COMEDI_NUM_MINORS, "comedi"); | |
2810 | if (retval) | |
2811 | return -EIO; | |
2812 | cdev_init(&comedi_cdev, &comedi_fops); | |
2813 | comedi_cdev.owner = THIS_MODULE; | |
a5bde3a1 AP |
2814 | |
2815 | retval = kobject_set_name(&comedi_cdev.kobj, "comedi"); | |
2816 | if (retval) { | |
2817 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
2818 | COMEDI_NUM_MINORS); | |
2819 | return retval; | |
2820 | } | |
2821 | ||
91fa0b0c HS |
2822 | if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) { |
2823 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
2824 | COMEDI_NUM_MINORS); | |
2825 | return -EIO; | |
2826 | } | |
2827 | comedi_class = class_create(THIS_MODULE, "comedi"); | |
2828 | if (IS_ERR(comedi_class)) { | |
c2ad078b | 2829 | pr_err("failed to create class\n"); |
91fa0b0c HS |
2830 | cdev_del(&comedi_cdev); |
2831 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
2832 | COMEDI_NUM_MINORS); | |
2833 | return PTR_ERR(comedi_class); | |
2834 | } | |
2835 | ||
e56341ad | 2836 | comedi_class->dev_groups = comedi_dev_groups; |
91fa0b0c HS |
2837 | |
2838 | /* XXX requires /proc interface */ | |
2839 | comedi_proc_init(); | |
2840 | ||
2841 | /* create devices files for legacy/manual use */ | |
2842 | for (i = 0; i < comedi_num_legacy_minors; i++) { | |
7638ffcb | 2843 | struct comedi_device *dev; |
4bac39f6 | 2844 | |
7638ffcb IA |
2845 | dev = comedi_alloc_board_minor(NULL); |
2846 | if (IS_ERR(dev)) { | |
682b9119 | 2847 | comedi_cleanup_board_minors(); |
91fa0b0c HS |
2848 | cdev_del(&comedi_cdev); |
2849 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
2850 | COMEDI_NUM_MINORS); | |
7638ffcb | 2851 | return PTR_ERR(dev); |
91fa0b0c | 2852 | } |
cb3aadae KH |
2853 | /* comedi_alloc_board_minor() locked the mutex */ |
2854 | mutex_unlock(&dev->mutex); | |
91fa0b0c HS |
2855 | } |
2856 | ||
2857 | return 0; | |
2858 | } | |
2859 | module_init(comedi_init); | |
2860 | ||
2861 | static void __exit comedi_cleanup(void) | |
2862 | { | |
2863 | int i; | |
2864 | ||
682b9119 | 2865 | comedi_cleanup_board_minors(); |
5b7dba1b IA |
2866 | for (i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i) |
2867 | BUG_ON(comedi_board_minor_table[i]); | |
2868 | for (i = 0; i < COMEDI_NUM_SUBDEVICE_MINORS; ++i) | |
2869 | BUG_ON(comedi_subdevice_minor_table[i]); | |
91fa0b0c HS |
2870 | |
2871 | class_destroy(comedi_class); | |
2872 | cdev_del(&comedi_cdev); | |
2873 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS); | |
2874 | ||
2875 | comedi_proc_cleanup(); | |
2876 | } | |
2877 | module_exit(comedi_cleanup); | |
2878 | ||
a5787824 HS |
2879 | MODULE_AUTHOR("http://www.comedi.org"); |
2880 | MODULE_DESCRIPTION("Comedi core module"); | |
2881 | MODULE_LICENSE("GPL"); |