Commit | Line | Data |
---|---|---|
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 | |
eb340aca IA |
46 | /** |
47 | * comedi_subdevice "runflags" | |
48 | * @COMEDI_SRF_RT: DEPRECATED: command is running real-time | |
49 | * @COMEDI_SRF_ERROR: indicates an COMEDI_CB_ERROR event has occurred | |
50 | * since the last command was started | |
51 | * @COMEDI_SRF_RUNNING: command is running | |
52 | * @COMEDI_SRF_FREE_SPRIV: free s->private on detach | |
53 | * | |
54 | * @COMEDI_SRF_BUSY_MASK: runflags that indicate the subdevice is "busy" | |
55 | */ | |
56 | #define COMEDI_SRF_RT BIT(1) | |
57 | #define COMEDI_SRF_ERROR BIT(2) | |
58 | #define COMEDI_SRF_RUNNING BIT(27) | |
59 | #define COMEDI_SRF_FREE_SPRIV BIT(31) | |
60 | ||
61 | #define COMEDI_SRF_BUSY_MASK (COMEDI_SRF_ERROR | COMEDI_SRF_RUNNING) | |
62 | ||
20f083c0 IA |
63 | /** |
64 | * struct comedi_file - per-file private data for comedi device | |
65 | * @dev: comedi_device struct | |
66 | * @read_subdev: current "read" subdevice | |
67 | * @write_subdev: current "write" subdevice | |
68 | * @last_detach_count: last known detach count | |
69 | * @last_attached: last known attached/detached state | |
70 | */ | |
71 | struct comedi_file { | |
72 | struct comedi_device *dev; | |
73 | struct comedi_subdevice *read_subdev; | |
74 | struct comedi_subdevice *write_subdev; | |
75 | unsigned int last_detach_count; | |
76 | bool last_attached:1; | |
77 | }; | |
78 | ||
eda56825 | 79 | #define COMEDI_NUM_MINORS 0x100 |
5b7dba1b IA |
80 | #define COMEDI_NUM_SUBDEVICE_MINORS \ |
81 | (COMEDI_NUM_MINORS - COMEDI_NUM_BOARD_MINORS) | |
eda56825 | 82 | |
92d0127c | 83 | static int comedi_num_legacy_minors; |
4d7df821 IA |
84 | module_param(comedi_num_legacy_minors, int, S_IRUGO); |
85 | MODULE_PARM_DESC(comedi_num_legacy_minors, | |
86 | "number of comedi minor devices to reserve for non-auto-configured devices (default 0)" | |
87 | ); | |
88 | ||
234bb3c6 | 89 | unsigned int comedi_default_buf_size_kb = CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB; |
4d7df821 IA |
90 | module_param(comedi_default_buf_size_kb, uint, S_IRUGO | S_IWUSR); |
91 | MODULE_PARM_DESC(comedi_default_buf_size_kb, | |
92 | "default asynchronous buffer size in KiB (default " | |
234bb3c6 | 93 | __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB) ")"); |
4d7df821 | 94 | |
234bb3c6 IA |
95 | unsigned int comedi_default_buf_maxsize_kb |
96 | = CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB; | |
4d7df821 IA |
97 | module_param(comedi_default_buf_maxsize_kb, uint, S_IRUGO | S_IWUSR); |
98 | MODULE_PARM_DESC(comedi_default_buf_maxsize_kb, | |
99 | "default maximum size of asynchronous buffer in KiB (default " | |
234bb3c6 | 100 | __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB) ")"); |
1dd33ab8 | 101 | |
5b7dba1b | 102 | static DEFINE_MUTEX(comedi_board_minor_table_lock); |
cb6b79de | 103 | static struct comedi_device |
5b7dba1b IA |
104 | *comedi_board_minor_table[COMEDI_NUM_BOARD_MINORS]; |
105 | ||
106 | static DEFINE_MUTEX(comedi_subdevice_minor_table_lock); | |
107 | /* Note: indexed by minor - COMEDI_NUM_BOARD_MINORS. */ | |
bd5b4173 | 108 | static struct comedi_subdevice |
5b7dba1b | 109 | *comedi_subdevice_minor_table[COMEDI_NUM_SUBDEVICE_MINORS]; |
476b8477 | 110 | |
d9740a03 IA |
111 | static struct class *comedi_class; |
112 | static struct cdev comedi_cdev; | |
113 | ||
114 | static void comedi_device_init(struct comedi_device *dev) | |
115 | { | |
5b13ed94 | 116 | kref_init(&dev->refcount); |
d9740a03 IA |
117 | spin_lock_init(&dev->spinlock); |
118 | mutex_init(&dev->mutex); | |
2f3fdcd7 | 119 | init_rwsem(&dev->attach_lock); |
d9740a03 IA |
120 | dev->minor = -1; |
121 | } | |
122 | ||
5b13ed94 IA |
123 | static void comedi_dev_kref_release(struct kref *kref) |
124 | { | |
125 | struct comedi_device *dev = | |
126 | container_of(kref, struct comedi_device, refcount); | |
127 | ||
128 | mutex_destroy(&dev->mutex); | |
8f988d87 | 129 | put_device(dev->class_dev); |
5b13ed94 IA |
130 | kfree(dev); |
131 | } | |
132 | ||
dd630cde IA |
133 | /** |
134 | * comedi_dev_put - release a use of a comedi device structure | |
135 | * @dev: comedi_device struct | |
136 | * | |
137 | * Must be called when a user of a comedi device is finished with it. | |
138 | * When the last user of the comedi device calls this function, the | |
139 | * comedi device is destroyed. | |
140 | * | |
141 | * Return 1 if the comedi device is destroyed by this call or dev is | |
142 | * NULL, otherwise return 0. Callers must not assume the comedi | |
143 | * device is still valid if this function returns 0. | |
144 | */ | |
5b13ed94 IA |
145 | int comedi_dev_put(struct comedi_device *dev) |
146 | { | |
147 | if (dev) | |
148 | return kref_put(&dev->refcount, comedi_dev_kref_release); | |
149 | return 1; | |
150 | } | |
b449c1ca IA |
151 | EXPORT_SYMBOL_GPL(comedi_dev_put); |
152 | ||
153 | static struct comedi_device *comedi_dev_get(struct comedi_device *dev) | |
154 | { | |
155 | if (dev) | |
156 | kref_get(&dev->refcount); | |
157 | return dev; | |
158 | } | |
5b13ed94 | 159 | |
d9740a03 IA |
160 | static void comedi_device_cleanup(struct comedi_device *dev) |
161 | { | |
162 | struct module *driver_module = NULL; | |
163 | ||
88cc30cf | 164 | if (!dev) |
d9740a03 IA |
165 | return; |
166 | mutex_lock(&dev->mutex); | |
167 | if (dev->attached) | |
168 | driver_module = dev->driver->module; | |
169 | comedi_device_detach(dev); | |
1363e4fb IA |
170 | if (driver_module && dev->use_count) |
171 | module_put(driver_module); | |
d9740a03 | 172 | mutex_unlock(&dev->mutex); |
d9740a03 IA |
173 | } |
174 | ||
db210da2 IA |
175 | static bool comedi_clear_board_dev(struct comedi_device *dev) |
176 | { | |
177 | unsigned int i = dev->minor; | |
178 | bool cleared = false; | |
179 | ||
180 | mutex_lock(&comedi_board_minor_table_lock); | |
181 | if (dev == comedi_board_minor_table[i]) { | |
182 | comedi_board_minor_table[i] = NULL; | |
183 | cleared = true; | |
184 | } | |
185 | mutex_unlock(&comedi_board_minor_table_lock); | |
186 | return cleared; | |
187 | } | |
188 | ||
cb6b79de | 189 | static struct comedi_device *comedi_clear_board_minor(unsigned minor) |
d9740a03 | 190 | { |
cb6b79de | 191 | struct comedi_device *dev; |
d9740a03 | 192 | |
5b7dba1b | 193 | mutex_lock(&comedi_board_minor_table_lock); |
cb6b79de | 194 | dev = comedi_board_minor_table[minor]; |
5b7dba1b IA |
195 | comedi_board_minor_table[minor] = NULL; |
196 | mutex_unlock(&comedi_board_minor_table_lock); | |
cb6b79de | 197 | return dev; |
d9740a03 IA |
198 | } |
199 | ||
cb6b79de | 200 | static void comedi_free_board_dev(struct comedi_device *dev) |
d9740a03 | 201 | { |
cb6b79de | 202 | if (dev) { |
52ef9e7c | 203 | comedi_device_cleanup(dev); |
cb6b79de IA |
204 | if (dev->class_dev) { |
205 | device_destroy(comedi_class, | |
206 | MKDEV(COMEDI_MAJOR, dev->minor)); | |
d9740a03 | 207 | } |
5b13ed94 | 208 | comedi_dev_put(dev); |
d9740a03 IA |
209 | } |
210 | } | |
8ab4ed6e | 211 | |
bd5b4173 | 212 | static struct comedi_subdevice |
63ab0395 | 213 | *comedi_subdevice_from_minor(const struct comedi_device *dev, unsigned minor) |
5b7dba1b | 214 | { |
bd5b4173 | 215 | struct comedi_subdevice *s; |
5b7dba1b IA |
216 | unsigned int i = minor - COMEDI_NUM_BOARD_MINORS; |
217 | ||
5b7dba1b | 218 | mutex_lock(&comedi_subdevice_minor_table_lock); |
bd5b4173 | 219 | s = comedi_subdevice_minor_table[i]; |
63ab0395 IA |
220 | if (s && s->device != dev) |
221 | s = NULL; | |
5b7dba1b | 222 | mutex_unlock(&comedi_subdevice_minor_table_lock); |
bd5b4173 | 223 | return s; |
5b7dba1b IA |
224 | } |
225 | ||
b449c1ca IA |
226 | static struct comedi_device *comedi_dev_get_from_board_minor(unsigned minor) |
227 | { | |
228 | struct comedi_device *dev; | |
229 | ||
230 | BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS); | |
231 | mutex_lock(&comedi_board_minor_table_lock); | |
232 | dev = comedi_dev_get(comedi_board_minor_table[minor]); | |
233 | mutex_unlock(&comedi_board_minor_table_lock); | |
234 | return dev; | |
235 | } | |
236 | ||
237 | static struct comedi_device *comedi_dev_get_from_subdevice_minor(unsigned minor) | |
238 | { | |
239 | struct comedi_device *dev; | |
240 | struct comedi_subdevice *s; | |
241 | unsigned int i = minor - COMEDI_NUM_BOARD_MINORS; | |
242 | ||
b449c1ca IA |
243 | mutex_lock(&comedi_subdevice_minor_table_lock); |
244 | s = comedi_subdevice_minor_table[i]; | |
245 | dev = comedi_dev_get(s ? s->device : NULL); | |
246 | mutex_unlock(&comedi_subdevice_minor_table_lock); | |
247 | return dev; | |
248 | } | |
249 | ||
dd630cde IA |
250 | /** |
251 | * comedi_dev_get_from_minor - get comedi device by minor device number | |
252 | * @minor: minor device number | |
253 | * | |
254 | * Finds the comedi device associated by the minor device number, if any, | |
255 | * and increments its reference count. The comedi device is prevented from | |
256 | * being freed until a matching call is made to comedi_dev_put(). | |
257 | * | |
258 | * Return a pointer to the comedi device if it exists, with its usage | |
259 | * reference incremented. Return NULL if no comedi device exists with the | |
260 | * specified minor device number. | |
261 | */ | |
b449c1ca IA |
262 | struct comedi_device *comedi_dev_get_from_minor(unsigned minor) |
263 | { | |
264 | if (minor < COMEDI_NUM_BOARD_MINORS) | |
265 | return comedi_dev_get_from_board_minor(minor); | |
cb3aadae KH |
266 | |
267 | return comedi_dev_get_from_subdevice_minor(minor); | |
b449c1ca IA |
268 | } |
269 | EXPORT_SYMBOL_GPL(comedi_dev_get_from_minor); | |
270 | ||
43bd33f2 | 271 | static struct comedi_subdevice * |
da56fdc6 | 272 | comedi_read_subdevice(const struct comedi_device *dev, unsigned int minor) |
43bd33f2 | 273 | { |
bd5b4173 | 274 | struct comedi_subdevice *s; |
da56fdc6 IA |
275 | |
276 | if (minor >= COMEDI_NUM_BOARD_MINORS) { | |
63ab0395 | 277 | s = comedi_subdevice_from_minor(dev, minor); |
88cc30cf | 278 | if (!s || (s->subdev_flags & SDF_CMD_READ)) |
bd5b4173 | 279 | return s; |
da56fdc6 IA |
280 | } |
281 | return dev->read_subdev; | |
43bd33f2 HS |
282 | } |
283 | ||
284 | static struct comedi_subdevice * | |
da56fdc6 | 285 | comedi_write_subdevice(const struct comedi_device *dev, unsigned int minor) |
43bd33f2 | 286 | { |
bd5b4173 | 287 | struct comedi_subdevice *s; |
da56fdc6 IA |
288 | |
289 | if (minor >= COMEDI_NUM_BOARD_MINORS) { | |
63ab0395 | 290 | s = comedi_subdevice_from_minor(dev, minor); |
88cc30cf | 291 | if (!s || (s->subdev_flags & SDF_CMD_WRITE)) |
bd5b4173 | 292 | return s; |
da56fdc6 IA |
293 | } |
294 | return dev->write_subdev; | |
43bd33f2 HS |
295 | } |
296 | ||
20f083c0 IA |
297 | static void comedi_file_reset(struct file *file) |
298 | { | |
299 | struct comedi_file *cfp = file->private_data; | |
300 | struct comedi_device *dev = cfp->dev; | |
301 | struct comedi_subdevice *s, *read_s, *write_s; | |
302 | unsigned int minor = iminor(file_inode(file)); | |
303 | ||
304 | read_s = dev->read_subdev; | |
305 | write_s = dev->write_subdev; | |
306 | if (minor >= COMEDI_NUM_BOARD_MINORS) { | |
307 | s = comedi_subdevice_from_minor(dev, minor); | |
88cc30cf | 308 | if (!s || s->subdev_flags & SDF_CMD_READ) |
20f083c0 | 309 | read_s = s; |
88cc30cf | 310 | if (!s || s->subdev_flags & SDF_CMD_WRITE) |
20f083c0 IA |
311 | write_s = s; |
312 | } | |
313 | cfp->last_attached = dev->attached; | |
314 | cfp->last_detach_count = dev->detach_count; | |
315 | ACCESS_ONCE(cfp->read_subdev) = read_s; | |
316 | ACCESS_ONCE(cfp->write_subdev) = write_s; | |
317 | } | |
318 | ||
319 | static void comedi_file_check(struct file *file) | |
320 | { | |
321 | struct comedi_file *cfp = file->private_data; | |
322 | struct comedi_device *dev = cfp->dev; | |
323 | ||
324 | if (cfp->last_attached != dev->attached || | |
325 | cfp->last_detach_count != dev->detach_count) | |
326 | comedi_file_reset(file); | |
327 | } | |
328 | ||
329 | static struct comedi_subdevice *comedi_file_read_subdevice(struct file *file) | |
330 | { | |
331 | struct comedi_file *cfp = file->private_data; | |
332 | ||
333 | comedi_file_check(file); | |
334 | return ACCESS_ONCE(cfp->read_subdev); | |
335 | } | |
336 | ||
337 | static struct comedi_subdevice *comedi_file_write_subdevice(struct file *file) | |
338 | { | |
339 | struct comedi_file *cfp = file->private_data; | |
340 | ||
341 | comedi_file_check(file); | |
342 | return ACCESS_ONCE(cfp->write_subdev); | |
343 | } | |
344 | ||
883db3d9 | 345 | static int resize_async_buffer(struct comedi_device *dev, |
482f0a21 | 346 | struct comedi_subdevice *s, unsigned new_size) |
a5011a26 | 347 | { |
482f0a21 | 348 | struct comedi_async *async = s->async; |
a5011a26 HS |
349 | int retval; |
350 | ||
351 | if (new_size > async->max_bufsize) | |
352 | return -EPERM; | |
353 | ||
354 | if (s->busy) { | |
272850f0 HS |
355 | dev_dbg(dev->class_dev, |
356 | "subdevice is busy, cannot resize buffer\n"); | |
a5011a26 HS |
357 | return -EBUSY; |
358 | } | |
d4526ab4 | 359 | if (comedi_buf_is_mmapped(s)) { |
272850f0 HS |
360 | dev_dbg(dev->class_dev, |
361 | "subdevice is mmapped, cannot resize buffer\n"); | |
a5011a26 HS |
362 | return -EBUSY; |
363 | } | |
364 | ||
a2aab8b4 | 365 | /* make sure buffer is an integral number of pages (we round up) */ |
a5011a26 HS |
366 | new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK; |
367 | ||
368 | retval = comedi_buf_alloc(dev, s, new_size); | |
369 | if (retval < 0) | |
370 | return retval; | |
371 | ||
372 | if (s->buf_change) { | |
d546b896 | 373 | retval = s->buf_change(dev, s); |
a5011a26 HS |
374 | if (retval < 0) |
375 | return retval; | |
376 | } | |
377 | ||
272850f0 HS |
378 | dev_dbg(dev->class_dev, "subd %d buffer resized to %i bytes\n", |
379 | s->index, async->prealloc_bufsz); | |
a5011a26 HS |
380 | return 0; |
381 | } | |
382 | ||
383 | /* sysfs attribute files */ | |
384 | ||
e56341ad | 385 | static ssize_t max_read_buffer_kb_show(struct device *csdev, |
a5011a26 HS |
386 | struct device_attribute *attr, char *buf) |
387 | { | |
c88db469 | 388 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
389 | struct comedi_device *dev; |
390 | struct comedi_subdevice *s; | |
72fd9fac | 391 | unsigned int size = 0; |
a5011a26 | 392 | |
be535c9a | 393 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 394 | if (!dev) |
c88db469 IA |
395 | return -ENODEV; |
396 | ||
7f4656c5 | 397 | mutex_lock(&dev->mutex); |
da56fdc6 | 398 | s = comedi_read_subdevice(dev, minor); |
72fd9fac HS |
399 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
400 | size = s->async->max_bufsize / 1024; | |
7f4656c5 | 401 | mutex_unlock(&dev->mutex); |
a5011a26 | 402 | |
be535c9a | 403 | comedi_dev_put(dev); |
ecd56ff9 | 404 | return snprintf(buf, PAGE_SIZE, "%u\n", size); |
a5011a26 HS |
405 | } |
406 | ||
e56341ad | 407 | static ssize_t max_read_buffer_kb_store(struct device *csdev, |
a5011a26 HS |
408 | struct device_attribute *attr, |
409 | const char *buf, size_t count) | |
410 | { | |
c88db469 | 411 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
412 | struct comedi_device *dev; |
413 | struct comedi_subdevice *s; | |
72fd9fac HS |
414 | unsigned int size; |
415 | int err; | |
416 | ||
417 | err = kstrtouint(buf, 10, &size); | |
418 | if (err) | |
419 | return err; | |
420 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 421 | return -EINVAL; |
72fd9fac | 422 | size *= 1024; |
a5011a26 | 423 | |
be535c9a | 424 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 425 | if (!dev) |
c88db469 IA |
426 | return -ENODEV; |
427 | ||
7f4656c5 | 428 | mutex_lock(&dev->mutex); |
da56fdc6 | 429 | s = comedi_read_subdevice(dev, minor); |
72fd9fac HS |
430 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
431 | s->async->max_bufsize = size; | |
432 | else | |
433 | err = -EINVAL; | |
7f4656c5 | 434 | mutex_unlock(&dev->mutex); |
a5011a26 | 435 | |
be535c9a | 436 | comedi_dev_put(dev); |
72fd9fac | 437 | return err ? err : count; |
a5011a26 | 438 | } |
e56341ad | 439 | static DEVICE_ATTR_RW(max_read_buffer_kb); |
a5011a26 | 440 | |
e56341ad | 441 | static ssize_t read_buffer_kb_show(struct device *csdev, |
a5011a26 HS |
442 | struct device_attribute *attr, char *buf) |
443 | { | |
c88db469 | 444 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
445 | struct comedi_device *dev; |
446 | struct comedi_subdevice *s; | |
72fd9fac | 447 | unsigned int size = 0; |
a5011a26 | 448 | |
be535c9a | 449 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 450 | if (!dev) |
c88db469 IA |
451 | return -ENODEV; |
452 | ||
7f4656c5 | 453 | mutex_lock(&dev->mutex); |
da56fdc6 | 454 | s = comedi_read_subdevice(dev, minor); |
72fd9fac HS |
455 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
456 | size = s->async->prealloc_bufsz / 1024; | |
7f4656c5 | 457 | mutex_unlock(&dev->mutex); |
a5011a26 | 458 | |
be535c9a | 459 | comedi_dev_put(dev); |
ecd56ff9 | 460 | return snprintf(buf, PAGE_SIZE, "%u\n", size); |
a5011a26 HS |
461 | } |
462 | ||
e56341ad | 463 | static ssize_t read_buffer_kb_store(struct device *csdev, |
a5011a26 HS |
464 | struct device_attribute *attr, |
465 | const char *buf, size_t count) | |
466 | { | |
c88db469 | 467 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
468 | struct comedi_device *dev; |
469 | struct comedi_subdevice *s; | |
72fd9fac HS |
470 | unsigned int size; |
471 | int err; | |
472 | ||
473 | err = kstrtouint(buf, 10, &size); | |
474 | if (err) | |
475 | return err; | |
476 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 477 | return -EINVAL; |
72fd9fac | 478 | size *= 1024; |
a5011a26 | 479 | |
be535c9a | 480 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 481 | if (!dev) |
c88db469 IA |
482 | return -ENODEV; |
483 | ||
7f4656c5 | 484 | mutex_lock(&dev->mutex); |
da56fdc6 | 485 | s = comedi_read_subdevice(dev, minor); |
72fd9fac | 486 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
482f0a21 | 487 | err = resize_async_buffer(dev, s, size); |
72fd9fac HS |
488 | else |
489 | err = -EINVAL; | |
7f4656c5 | 490 | mutex_unlock(&dev->mutex); |
a5011a26 | 491 | |
be535c9a | 492 | comedi_dev_put(dev); |
72fd9fac | 493 | return err ? err : count; |
a5011a26 | 494 | } |
e56341ad | 495 | static DEVICE_ATTR_RW(read_buffer_kb); |
883db3d9 | 496 | |
e56341ad | 497 | static ssize_t max_write_buffer_kb_show(struct device *csdev, |
a5011a26 HS |
498 | struct device_attribute *attr, |
499 | char *buf) | |
500 | { | |
c88db469 | 501 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
502 | struct comedi_device *dev; |
503 | struct comedi_subdevice *s; | |
72fd9fac | 504 | unsigned int size = 0; |
a5011a26 | 505 | |
be535c9a | 506 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 507 | if (!dev) |
c88db469 IA |
508 | return -ENODEV; |
509 | ||
7f4656c5 | 510 | mutex_lock(&dev->mutex); |
da56fdc6 | 511 | s = comedi_write_subdevice(dev, minor); |
72fd9fac HS |
512 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
513 | size = s->async->max_bufsize / 1024; | |
7f4656c5 | 514 | mutex_unlock(&dev->mutex); |
a5011a26 | 515 | |
be535c9a | 516 | comedi_dev_put(dev); |
ecd56ff9 | 517 | return snprintf(buf, PAGE_SIZE, "%u\n", size); |
a5011a26 HS |
518 | } |
519 | ||
e56341ad | 520 | static ssize_t max_write_buffer_kb_store(struct device *csdev, |
a5011a26 HS |
521 | struct device_attribute *attr, |
522 | const char *buf, size_t count) | |
523 | { | |
c88db469 | 524 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
525 | struct comedi_device *dev; |
526 | struct comedi_subdevice *s; | |
72fd9fac HS |
527 | unsigned int size; |
528 | int err; | |
529 | ||
530 | err = kstrtouint(buf, 10, &size); | |
531 | if (err) | |
532 | return err; | |
533 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 534 | return -EINVAL; |
72fd9fac | 535 | size *= 1024; |
a5011a26 | 536 | |
be535c9a | 537 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 538 | if (!dev) |
c88db469 IA |
539 | return -ENODEV; |
540 | ||
7f4656c5 | 541 | mutex_lock(&dev->mutex); |
da56fdc6 | 542 | s = comedi_write_subdevice(dev, minor); |
72fd9fac HS |
543 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
544 | s->async->max_bufsize = size; | |
545 | else | |
546 | err = -EINVAL; | |
7f4656c5 | 547 | mutex_unlock(&dev->mutex); |
a5011a26 | 548 | |
be535c9a | 549 | comedi_dev_put(dev); |
72fd9fac | 550 | return err ? err : count; |
a5011a26 | 551 | } |
e56341ad | 552 | static DEVICE_ATTR_RW(max_write_buffer_kb); |
a5011a26 | 553 | |
e56341ad | 554 | static ssize_t write_buffer_kb_show(struct device *csdev, |
a5011a26 HS |
555 | struct device_attribute *attr, char *buf) |
556 | { | |
c88db469 | 557 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
558 | struct comedi_device *dev; |
559 | struct comedi_subdevice *s; | |
72fd9fac | 560 | unsigned int size = 0; |
a5011a26 | 561 | |
be535c9a | 562 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 563 | if (!dev) |
c88db469 IA |
564 | return -ENODEV; |
565 | ||
7f4656c5 | 566 | mutex_lock(&dev->mutex); |
da56fdc6 | 567 | s = comedi_write_subdevice(dev, minor); |
72fd9fac HS |
568 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
569 | size = s->async->prealloc_bufsz / 1024; | |
7f4656c5 | 570 | mutex_unlock(&dev->mutex); |
a5011a26 | 571 | |
be535c9a | 572 | comedi_dev_put(dev); |
ecd56ff9 | 573 | return snprintf(buf, PAGE_SIZE, "%u\n", size); |
a5011a26 HS |
574 | } |
575 | ||
e56341ad | 576 | static ssize_t write_buffer_kb_store(struct device *csdev, |
a5011a26 HS |
577 | struct device_attribute *attr, |
578 | const char *buf, size_t count) | |
579 | { | |
c88db469 | 580 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
581 | struct comedi_device *dev; |
582 | struct comedi_subdevice *s; | |
72fd9fac HS |
583 | unsigned int size; |
584 | int err; | |
585 | ||
586 | err = kstrtouint(buf, 10, &size); | |
587 | if (err) | |
588 | return err; | |
589 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 590 | return -EINVAL; |
72fd9fac | 591 | size *= 1024; |
a5011a26 | 592 | |
be535c9a | 593 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 594 | if (!dev) |
c88db469 IA |
595 | return -ENODEV; |
596 | ||
7f4656c5 | 597 | mutex_lock(&dev->mutex); |
da56fdc6 | 598 | s = comedi_write_subdevice(dev, minor); |
72fd9fac | 599 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
482f0a21 | 600 | err = resize_async_buffer(dev, s, size); |
72fd9fac HS |
601 | else |
602 | err = -EINVAL; | |
7f4656c5 | 603 | mutex_unlock(&dev->mutex); |
a5011a26 | 604 | |
be535c9a | 605 | comedi_dev_put(dev); |
72fd9fac | 606 | return err ? err : count; |
a5011a26 | 607 | } |
e56341ad GKH |
608 | static DEVICE_ATTR_RW(write_buffer_kb); |
609 | ||
610 | static struct attribute *comedi_dev_attrs[] = { | |
611 | &dev_attr_max_read_buffer_kb.attr, | |
612 | &dev_attr_read_buffer_kb.attr, | |
613 | &dev_attr_max_write_buffer_kb.attr, | |
614 | &dev_attr_write_buffer_kb.attr, | |
615 | NULL, | |
a5011a26 | 616 | }; |
e56341ad | 617 | ATTRIBUTE_GROUPS(comedi_dev); |
ed9eccbe | 618 | |
ef4b4b27 IA |
619 | static void __comedi_clear_subdevice_runflags(struct comedi_subdevice *s, |
620 | unsigned bits) | |
621 | { | |
622 | s->runflags &= ~bits; | |
623 | } | |
624 | ||
625 | static void __comedi_set_subdevice_runflags(struct comedi_subdevice *s, | |
626 | unsigned bits) | |
627 | { | |
628 | s->runflags |= bits; | |
629 | } | |
630 | ||
cc64ea42 IA |
631 | static void comedi_update_subdevice_runflags(struct comedi_subdevice *s, |
632 | unsigned mask, unsigned bits) | |
2aae0076 HS |
633 | { |
634 | unsigned long flags; | |
635 | ||
636 | spin_lock_irqsave(&s->spin_lock, flags); | |
ef4b4b27 IA |
637 | __comedi_clear_subdevice_runflags(s, mask); |
638 | __comedi_set_subdevice_runflags(s, bits & mask); | |
2aae0076 HS |
639 | spin_unlock_irqrestore(&s->spin_lock, flags); |
640 | } | |
641 | ||
ef4b4b27 IA |
642 | static unsigned __comedi_get_subdevice_runflags(struct comedi_subdevice *s) |
643 | { | |
644 | return s->runflags; | |
645 | } | |
646 | ||
ade1764f | 647 | static unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s) |
74120719 HS |
648 | { |
649 | unsigned long flags; | |
650 | unsigned runflags; | |
651 | ||
652 | spin_lock_irqsave(&s->spin_lock, flags); | |
ef4b4b27 | 653 | runflags = __comedi_get_subdevice_runflags(s); |
74120719 HS |
654 | spin_unlock_irqrestore(&s->spin_lock, flags); |
655 | return runflags; | |
656 | } | |
74120719 | 657 | |
b183a836 IA |
658 | static bool comedi_is_runflags_running(unsigned runflags) |
659 | { | |
660 | return runflags & COMEDI_SRF_RUNNING; | |
661 | } | |
662 | ||
663 | static bool comedi_is_runflags_in_error(unsigned runflags) | |
664 | { | |
665 | return runflags & COMEDI_SRF_ERROR; | |
666 | } | |
667 | ||
dd630cde IA |
668 | /** |
669 | * comedi_is_subdevice_running - check if async command running on subdevice | |
670 | * @s: comedi_subdevice struct | |
671 | * | |
672 | * Return true if an asynchronous comedi command is active on the comedi | |
673 | * subdevice, else return false. | |
674 | */ | |
e0dac318 HS |
675 | bool comedi_is_subdevice_running(struct comedi_subdevice *s) |
676 | { | |
677 | unsigned runflags = comedi_get_subdevice_runflags(s); | |
678 | ||
b183a836 | 679 | return comedi_is_runflags_running(runflags); |
e0dac318 HS |
680 | } |
681 | EXPORT_SYMBOL_GPL(comedi_is_subdevice_running); | |
682 | ||
ef4b4b27 IA |
683 | static bool __comedi_is_subdevice_running(struct comedi_subdevice *s) |
684 | { | |
685 | unsigned runflags = __comedi_get_subdevice_runflags(s); | |
686 | ||
687 | return comedi_is_runflags_running(runflags); | |
688 | } | |
689 | ||
9682e28c HS |
690 | static bool comedi_is_subdevice_idle(struct comedi_subdevice *s) |
691 | { | |
692 | unsigned runflags = comedi_get_subdevice_runflags(s); | |
693 | ||
38ee1fd3 | 694 | return !(runflags & COMEDI_SRF_BUSY_MASK); |
9682e28c HS |
695 | } |
696 | ||
8fc369ae IA |
697 | bool comedi_can_auto_free_spriv(struct comedi_subdevice *s) |
698 | { | |
699 | unsigned runflags = __comedi_get_subdevice_runflags(s); | |
700 | ||
701 | return runflags & COMEDI_SRF_FREE_SPRIV; | |
702 | } | |
703 | ||
704 | /** | |
705 | * comedi_set_spriv_auto_free - mark subdevice private data as freeable | |
706 | * @s: comedi_subdevice struct | |
707 | * | |
708 | * Mark the subdevice as having a pointer to private data that can be | |
709 | * automatically freed by the comedi core during the detach. | |
710 | */ | |
711 | void comedi_set_spriv_auto_free(struct comedi_subdevice *s) | |
712 | { | |
713 | __comedi_set_subdevice_runflags(s, COMEDI_SRF_FREE_SPRIV); | |
714 | } | |
715 | EXPORT_SYMBOL_GPL(comedi_set_spriv_auto_free); | |
716 | ||
588ba6dc | 717 | /** |
8fc369ae | 718 | * comedi_alloc_spriv - Allocate memory for the subdevice private data. |
588ba6dc | 719 | * @s: comedi_subdevice struct |
0480bcb9 | 720 | * @size: size of the memory to allocate |
588ba6dc HS |
721 | * |
722 | * This also sets the subdevice runflags to allow the core to automatically | |
723 | * free the private data during the detach. | |
724 | */ | |
0480bcb9 | 725 | void *comedi_alloc_spriv(struct comedi_subdevice *s, size_t size) |
588ba6dc | 726 | { |
0480bcb9 HS |
727 | s->private = kzalloc(size, GFP_KERNEL); |
728 | if (s->private) | |
8fc369ae | 729 | comedi_set_spriv_auto_free(s); |
0480bcb9 | 730 | return s->private; |
588ba6dc | 731 | } |
0480bcb9 | 732 | EXPORT_SYMBOL_GPL(comedi_alloc_spriv); |
588ba6dc | 733 | |
2aae0076 | 734 | /* |
a2aab8b4 | 735 | * This function restores a subdevice to an idle state. |
2aae0076 HS |
736 | */ |
737 | static void do_become_nonbusy(struct comedi_device *dev, | |
738 | struct comedi_subdevice *s) | |
739 | { | |
740 | struct comedi_async *async = s->async; | |
741 | ||
cc64ea42 | 742 | comedi_update_subdevice_runflags(s, COMEDI_SRF_RUNNING, 0); |
2aae0076 | 743 | if (async) { |
fcc18a9a | 744 | comedi_buf_reset(s); |
2aae0076 HS |
745 | async->inttrig = NULL; |
746 | kfree(async->cmd.chanlist); | |
747 | async->cmd.chanlist = NULL; | |
8da8c86f | 748 | s->busy = NULL; |
258c1dd7 | 749 | wake_up_interruptible_all(&async->wait_head); |
2aae0076 HS |
750 | } else { |
751 | dev_err(dev->class_dev, | |
752 | "BUG: (?) do_become_nonbusy called with async=NULL\n"); | |
8da8c86f | 753 | s->busy = NULL; |
2aae0076 | 754 | } |
2aae0076 HS |
755 | } |
756 | ||
757 | static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s) | |
758 | { | |
759 | int ret = 0; | |
760 | ||
f0124630 | 761 | if (comedi_is_subdevice_running(s) && s->cancel) |
2aae0076 HS |
762 | ret = s->cancel(dev, s); |
763 | ||
764 | do_become_nonbusy(dev, s); | |
765 | ||
766 | return ret; | |
767 | } | |
768 | ||
d19db51a IA |
769 | void comedi_device_cancel_all(struct comedi_device *dev) |
770 | { | |
771 | struct comedi_subdevice *s; | |
772 | int i; | |
773 | ||
774 | if (!dev->attached) | |
775 | return; | |
776 | ||
777 | for (i = 0; i < dev->n_subdevices; i++) { | |
778 | s = &dev->subdevices[i]; | |
779 | if (s->async) | |
780 | do_cancel(dev, s); | |
781 | } | |
782 | } | |
783 | ||
2aae0076 HS |
784 | static int is_device_busy(struct comedi_device *dev) |
785 | { | |
786 | struct comedi_subdevice *s; | |
787 | int i; | |
788 | ||
789 | if (!dev->attached) | |
790 | return 0; | |
791 | ||
792 | for (i = 0; i < dev->n_subdevices; i++) { | |
793 | s = &dev->subdevices[i]; | |
794 | if (s->busy) | |
795 | return 1; | |
d4526ab4 | 796 | if (s->async && comedi_buf_is_mmapped(s)) |
2aae0076 HS |
797 | return 1; |
798 | } | |
799 | ||
800 | return 0; | |
801 | } | |
802 | ||
ed9eccbe | 803 | /* |
18e01b24 IA |
804 | * COMEDI_DEVCONFIG ioctl |
805 | * attaches (and configures) or detaches a legacy device | |
806 | * | |
807 | * arg: | |
808 | * pointer to comedi_devconfig structure (NULL if detaching) | |
809 | * | |
810 | * reads: | |
811 | * comedi_devconfig structure (if attaching) | |
812 | * | |
813 | * writes: | |
814 | * nothing | |
815 | */ | |
0a85b6f0 | 816 | static int do_devconfig_ioctl(struct comedi_device *dev, |
92d0127c | 817 | struct comedi_devconfig __user *arg) |
ed9eccbe | 818 | { |
0707bb04 | 819 | struct comedi_devconfig it; |
ed9eccbe DS |
820 | |
821 | if (!capable(CAP_SYS_ADMIN)) | |
822 | return -EPERM; | |
823 | ||
88cc30cf | 824 | if (!arg) { |
ed9eccbe DS |
825 | if (is_device_busy(dev)) |
826 | return -EBUSY; | |
476b8477 | 827 | if (dev->attached) { |
ed9eccbe | 828 | struct module *driver_module = dev->driver->module; |
4bac39f6 | 829 | |
ed9eccbe DS |
830 | comedi_device_detach(dev); |
831 | module_put(driver_module); | |
832 | } | |
833 | return 0; | |
834 | } | |
835 | ||
bc252fd1 | 836 | if (copy_from_user(&it, arg, sizeof(it))) |
ed9eccbe DS |
837 | return -EFAULT; |
838 | ||
839 | it.board_name[COMEDI_NAMELEN - 1] = 0; | |
840 | ||
d1843132 HS |
841 | if (it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) { |
842 | dev_warn(dev->class_dev, | |
843 | "comedi_config --init_data is deprecated\n"); | |
844 | return -EINVAL; | |
ed9eccbe DS |
845 | } |
846 | ||
8ab4ed6e IA |
847 | if (dev->minor >= comedi_num_legacy_minors) |
848 | /* don't re-use dynamically allocated comedi devices */ | |
849 | return -EBUSY; | |
850 | ||
b2a644b4 IA |
851 | /* This increments the driver module count on success. */ |
852 | return comedi_device_attach(dev, &it); | |
ed9eccbe DS |
853 | } |
854 | ||
855 | /* | |
18e01b24 IA |
856 | * COMEDI_BUFCONFIG ioctl |
857 | * buffer configuration | |
858 | * | |
859 | * arg: | |
860 | * pointer to comedi_bufconfig structure | |
861 | * | |
862 | * reads: | |
863 | * comedi_bufconfig structure | |
864 | * | |
865 | * writes: | |
866 | * modified comedi_bufconfig structure | |
867 | */ | |
92d0127c GKH |
868 | static int do_bufconfig_ioctl(struct comedi_device *dev, |
869 | struct comedi_bufconfig __user *arg) | |
ed9eccbe | 870 | { |
be6aba4a | 871 | struct comedi_bufconfig bc; |
d163679c | 872 | struct comedi_async *async; |
34c43922 | 873 | struct comedi_subdevice *s; |
883db3d9 | 874 | int retval = 0; |
ed9eccbe | 875 | |
bc252fd1 | 876 | if (copy_from_user(&bc, arg, sizeof(bc))) |
ed9eccbe DS |
877 | return -EFAULT; |
878 | ||
11f80ddf | 879 | if (bc.subdevice >= dev->n_subdevices) |
ed9eccbe DS |
880 | return -EINVAL; |
881 | ||
b077f2cd | 882 | s = &dev->subdevices[bc.subdevice]; |
ed9eccbe DS |
883 | async = s->async; |
884 | ||
885 | if (!async) { | |
272850f0 HS |
886 | dev_dbg(dev->class_dev, |
887 | "subdevice does not have async capability\n"); | |
ed9eccbe DS |
888 | bc.size = 0; |
889 | bc.maximum_size = 0; | |
890 | goto copyback; | |
891 | } | |
892 | ||
893 | if (bc.maximum_size) { | |
894 | if (!capable(CAP_SYS_ADMIN)) | |
895 | return -EPERM; | |
896 | ||
897 | async->max_bufsize = bc.maximum_size; | |
898 | } | |
899 | ||
900 | if (bc.size) { | |
482f0a21 | 901 | retval = resize_async_buffer(dev, s, bc.size); |
883db3d9 FMH |
902 | if (retval < 0) |
903 | return retval; | |
ed9eccbe DS |
904 | } |
905 | ||
906 | bc.size = async->prealloc_bufsz; | |
907 | bc.maximum_size = async->max_bufsize; | |
908 | ||
476b8477 | 909 | copyback: |
bc252fd1 | 910 | if (copy_to_user(arg, &bc, sizeof(bc))) |
ed9eccbe DS |
911 | return -EFAULT; |
912 | ||
913 | return 0; | |
914 | } | |
915 | ||
916 | /* | |
18e01b24 IA |
917 | * COMEDI_DEVINFO ioctl |
918 | * device info | |
919 | * | |
920 | * arg: | |
921 | * pointer to comedi_devinfo structure | |
922 | * | |
923 | * reads: | |
924 | * nothing | |
925 | * | |
926 | * writes: | |
927 | * comedi_devinfo structure | |
928 | */ | |
0a85b6f0 | 929 | static int do_devinfo_ioctl(struct comedi_device *dev, |
92d0127c GKH |
930 | struct comedi_devinfo __user *arg, |
931 | struct file *file) | |
ed9eccbe | 932 | { |
0e700923 HS |
933 | struct comedi_subdevice *s; |
934 | struct comedi_devinfo devinfo; | |
ed9eccbe DS |
935 | |
936 | memset(&devinfo, 0, sizeof(devinfo)); | |
937 | ||
938 | /* fill devinfo structure */ | |
939 | devinfo.version_code = COMEDI_VERSION_CODE; | |
940 | devinfo.n_subdevs = dev->n_subdevices; | |
819cbb12 VK |
941 | strlcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN); |
942 | strlcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN); | |
ed9eccbe | 943 | |
20f083c0 | 944 | s = comedi_file_read_subdevice(file); |
0e700923 | 945 | if (s) |
90a35c15 | 946 | devinfo.read_subdevice = s->index; |
476b8477 | 947 | else |
ed9eccbe | 948 | devinfo.read_subdevice = -1; |
476b8477 | 949 | |
20f083c0 | 950 | s = comedi_file_write_subdevice(file); |
0e700923 | 951 | if (s) |
90a35c15 | 952 | devinfo.write_subdevice = s->index; |
476b8477 | 953 | else |
ed9eccbe | 954 | devinfo.write_subdevice = -1; |
ed9eccbe | 955 | |
bc252fd1 | 956 | if (copy_to_user(arg, &devinfo, sizeof(devinfo))) |
ed9eccbe DS |
957 | return -EFAULT; |
958 | ||
959 | return 0; | |
960 | } | |
961 | ||
962 | /* | |
18e01b24 IA |
963 | * COMEDI_SUBDINFO ioctl |
964 | * subdevices info | |
965 | * | |
966 | * arg: | |
967 | * pointer to array of comedi_subdinfo structures | |
968 | * | |
969 | * reads: | |
970 | * nothing | |
971 | * | |
972 | * writes: | |
973 | * array of comedi_subdinfo structures | |
974 | */ | |
0a85b6f0 | 975 | static int do_subdinfo_ioctl(struct comedi_device *dev, |
92d0127c | 976 | struct comedi_subdinfo __user *arg, void *file) |
ed9eccbe DS |
977 | { |
978 | int ret, i; | |
bd52efbb | 979 | struct comedi_subdinfo *tmp, *us; |
34c43922 | 980 | struct comedi_subdevice *s; |
ed9eccbe | 981 | |
bc252fd1 | 982 | tmp = kcalloc(dev->n_subdevices, sizeof(*tmp), GFP_KERNEL); |
ed9eccbe DS |
983 | if (!tmp) |
984 | return -ENOMEM; | |
985 | ||
986 | /* fill subdinfo structs */ | |
987 | for (i = 0; i < dev->n_subdevices; i++) { | |
b077f2cd | 988 | s = &dev->subdevices[i]; |
ed9eccbe DS |
989 | us = tmp + i; |
990 | ||
991 | us->type = s->type; | |
992 | us->n_chan = s->n_chan; | |
993 | us->subd_flags = s->subdev_flags; | |
f0124630 | 994 | if (comedi_is_subdevice_running(s)) |
ed9eccbe DS |
995 | us->subd_flags |= SDF_RUNNING; |
996 | #define TIMER_nanosec 5 /* backwards compatibility */ | |
997 | us->timer_type = TIMER_nanosec; | |
998 | us->len_chanlist = s->len_chanlist; | |
999 | us->maxdata = s->maxdata; | |
1000 | if (s->range_table) { | |
1001 | us->range_type = | |
476b8477 | 1002 | (i << 24) | (0 << 16) | (s->range_table->length); |
ed9eccbe DS |
1003 | } else { |
1004 | us->range_type = 0; /* XXX */ | |
1005 | } | |
ed9eccbe DS |
1006 | |
1007 | if (s->busy) | |
1008 | us->subd_flags |= SDF_BUSY; | |
1009 | if (s->busy == file) | |
1010 | us->subd_flags |= SDF_BUSY_OWNER; | |
1011 | if (s->lock) | |
1012 | us->subd_flags |= SDF_LOCKED; | |
1013 | if (s->lock == file) | |
1014 | us->subd_flags |= SDF_LOCK_OWNER; | |
1015 | if (!s->maxdata && s->maxdata_list) | |
1016 | us->subd_flags |= SDF_MAXDATA; | |
ed9eccbe DS |
1017 | if (s->range_table_list) |
1018 | us->subd_flags |= SDF_RANGETYPE; | |
1019 | if (s->do_cmd) | |
1020 | us->subd_flags |= SDF_CMD; | |
1021 | ||
1022 | if (s->insn_bits != &insn_inval) | |
1023 | us->insn_bits_support = COMEDI_SUPPORTED; | |
1024 | else | |
1025 | us->insn_bits_support = COMEDI_UNSUPPORTED; | |
ed9eccbe DS |
1026 | } |
1027 | ||
bc252fd1 | 1028 | ret = copy_to_user(arg, tmp, dev->n_subdevices * sizeof(*tmp)); |
ed9eccbe DS |
1029 | |
1030 | kfree(tmp); | |
1031 | ||
1032 | return ret ? -EFAULT : 0; | |
1033 | } | |
1034 | ||
1035 | /* | |
18e01b24 IA |
1036 | * COMEDI_CHANINFO ioctl |
1037 | * subdevice channel info | |
1038 | * | |
1039 | * arg: | |
1040 | * pointer to comedi_chaninfo structure | |
1041 | * | |
1042 | * reads: | |
1043 | * comedi_chaninfo structure | |
1044 | * | |
1045 | * writes: | |
1046 | * array of maxdata values to chaninfo->maxdata_list if requested | |
1047 | * array of range table lengths to chaninfo->range_table_list if requested | |
1048 | */ | |
0a85b6f0 | 1049 | static int do_chaninfo_ioctl(struct comedi_device *dev, |
92d0127c | 1050 | struct comedi_chaninfo __user *arg) |
ed9eccbe | 1051 | { |
34c43922 | 1052 | struct comedi_subdevice *s; |
a18b416d | 1053 | struct comedi_chaninfo it; |
ed9eccbe | 1054 | |
bc252fd1 | 1055 | if (copy_from_user(&it, arg, sizeof(it))) |
ed9eccbe DS |
1056 | return -EFAULT; |
1057 | ||
1058 | if (it.subdev >= dev->n_subdevices) | |
1059 | return -EINVAL; | |
b077f2cd | 1060 | s = &dev->subdevices[it.subdev]; |
ed9eccbe DS |
1061 | |
1062 | if (it.maxdata_list) { | |
1063 | if (s->maxdata || !s->maxdata_list) | |
1064 | return -EINVAL; | |
1065 | if (copy_to_user(it.maxdata_list, s->maxdata_list, | |
790c5541 | 1066 | s->n_chan * sizeof(unsigned int))) |
ed9eccbe DS |
1067 | return -EFAULT; |
1068 | } | |
1069 | ||
64d9b1d2 IA |
1070 | if (it.flaglist) |
1071 | return -EINVAL; /* flaglist not supported */ | |
ed9eccbe DS |
1072 | |
1073 | if (it.rangelist) { | |
1074 | int i; | |
1075 | ||
1076 | if (!s->range_table_list) | |
1077 | return -EINVAL; | |
1078 | for (i = 0; i < s->n_chan; i++) { | |
1079 | int x; | |
1080 | ||
1081 | x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) | | |
476b8477 | 1082 | (s->range_table_list[i]->length); |
81604d43 VK |
1083 | if (put_user(x, it.rangelist + i)) |
1084 | return -EFAULT; | |
ed9eccbe | 1085 | } |
ed9eccbe DS |
1086 | } |
1087 | ||
1088 | return 0; | |
1089 | } | |
1090 | ||
18e01b24 IA |
1091 | /* |
1092 | * COMEDI_BUFINFO ioctl | |
1093 | * buffer information | |
1094 | * | |
1095 | * arg: | |
1096 | * pointer to comedi_bufinfo structure | |
1097 | * | |
1098 | * reads: | |
1099 | * comedi_bufinfo structure | |
1100 | * | |
1101 | * writes: | |
1102 | * modified comedi_bufinfo structure | |
1103 | */ | |
92d0127c | 1104 | static int do_bufinfo_ioctl(struct comedi_device *dev, |
53fa827e | 1105 | struct comedi_bufinfo __user *arg, void *file) |
ed9eccbe | 1106 | { |
9aa5339a | 1107 | struct comedi_bufinfo bi; |
34c43922 | 1108 | struct comedi_subdevice *s; |
d163679c | 1109 | struct comedi_async *async; |
ed9eccbe | 1110 | |
bc252fd1 | 1111 | if (copy_from_user(&bi, arg, sizeof(bi))) |
ed9eccbe DS |
1112 | return -EFAULT; |
1113 | ||
7b1a5e2f | 1114 | if (bi.subdevice >= dev->n_subdevices) |
ed9eccbe DS |
1115 | return -EINVAL; |
1116 | ||
b077f2cd | 1117 | s = &dev->subdevices[bi.subdevice]; |
53fa827e | 1118 | |
ed9eccbe DS |
1119 | async = s->async; |
1120 | ||
1121 | if (!async) { | |
272850f0 HS |
1122 | dev_dbg(dev->class_dev, |
1123 | "subdevice does not have async capability\n"); | |
ed9eccbe DS |
1124 | bi.buf_write_ptr = 0; |
1125 | bi.buf_read_ptr = 0; | |
1126 | bi.buf_write_count = 0; | |
1127 | bi.buf_read_count = 0; | |
4772c018 IA |
1128 | bi.bytes_read = 0; |
1129 | bi.bytes_written = 0; | |
ed9eccbe DS |
1130 | goto copyback; |
1131 | } | |
53fa827e IA |
1132 | if (!s->busy) { |
1133 | bi.bytes_read = 0; | |
1134 | bi.bytes_written = 0; | |
1135 | goto copyback_position; | |
1136 | } | |
1137 | if (s->busy != file) | |
1138 | return -EACCES; | |
ed9eccbe | 1139 | |
75f6108f | 1140 | if (bi.bytes_read && !(async->cmd.flags & CMDF_WRITE)) { |
d13be55a | 1141 | bi.bytes_read = comedi_buf_read_alloc(s, bi.bytes_read); |
f1df8662 | 1142 | comedi_buf_read_free(s, bi.bytes_read); |
ed9eccbe | 1143 | |
9682e28c | 1144 | if (comedi_is_subdevice_idle(s) && |
f4f3f7cf | 1145 | comedi_buf_n_bytes_ready(s) == 0) { |
ed9eccbe DS |
1146 | do_become_nonbusy(dev, s); |
1147 | } | |
1148 | } | |
1149 | ||
75f6108f | 1150 | if (bi.bytes_written && (async->cmd.flags & CMDF_WRITE)) { |
ed9eccbe | 1151 | bi.bytes_written = |
24e894bb | 1152 | comedi_buf_write_alloc(s, bi.bytes_written); |
940dd35d | 1153 | comedi_buf_write_free(s, bi.bytes_written); |
ed9eccbe DS |
1154 | } |
1155 | ||
53fa827e | 1156 | copyback_position: |
ed9eccbe DS |
1157 | bi.buf_write_count = async->buf_write_count; |
1158 | bi.buf_write_ptr = async->buf_write_ptr; | |
1159 | bi.buf_read_count = async->buf_read_count; | |
1160 | bi.buf_read_ptr = async->buf_read_ptr; | |
1161 | ||
476b8477 | 1162 | copyback: |
bc252fd1 | 1163 | if (copy_to_user(arg, &bi, sizeof(bi))) |
ed9eccbe DS |
1164 | return -EFAULT; |
1165 | ||
1166 | return 0; | |
1167 | } | |
1168 | ||
0a85b6f0 MT |
1169 | static int check_insn_config_length(struct comedi_insn *insn, |
1170 | unsigned int *data) | |
ed9eccbe | 1171 | { |
476b8477 GKH |
1172 | if (insn->n < 1) |
1173 | return -EINVAL; | |
ed9eccbe DS |
1174 | |
1175 | switch (data[0]) { | |
1176 | case INSN_CONFIG_DIO_OUTPUT: | |
1177 | case INSN_CONFIG_DIO_INPUT: | |
1178 | case INSN_CONFIG_DISARM: | |
1179 | case INSN_CONFIG_RESET: | |
1180 | if (insn->n == 1) | |
1181 | return 0; | |
1182 | break; | |
1183 | case INSN_CONFIG_ARM: | |
1184 | case INSN_CONFIG_DIO_QUERY: | |
1185 | case INSN_CONFIG_BLOCK_SIZE: | |
1186 | case INSN_CONFIG_FILTER: | |
1187 | case INSN_CONFIG_SERIAL_CLOCK: | |
1188 | case INSN_CONFIG_BIDIRECTIONAL_DATA: | |
1189 | case INSN_CONFIG_ALT_SOURCE: | |
1190 | case INSN_CONFIG_SET_COUNTER_MODE: | |
1191 | case INSN_CONFIG_8254_READ_STATUS: | |
1192 | case INSN_CONFIG_SET_ROUTING: | |
1193 | case INSN_CONFIG_GET_ROUTING: | |
1194 | case INSN_CONFIG_GET_PWM_STATUS: | |
1195 | case INSN_CONFIG_PWM_SET_PERIOD: | |
1196 | case INSN_CONFIG_PWM_GET_PERIOD: | |
1197 | if (insn->n == 2) | |
1198 | return 0; | |
1199 | break; | |
1200 | case INSN_CONFIG_SET_GATE_SRC: | |
1201 | case INSN_CONFIG_GET_GATE_SRC: | |
1202 | case INSN_CONFIG_SET_CLOCK_SRC: | |
1203 | case INSN_CONFIG_GET_CLOCK_SRC: | |
1204 | case INSN_CONFIG_SET_OTHER_SRC: | |
1205 | case INSN_CONFIG_GET_COUNTER_STATUS: | |
1206 | case INSN_CONFIG_PWM_SET_H_BRIDGE: | |
1207 | case INSN_CONFIG_PWM_GET_H_BRIDGE: | |
1208 | case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE: | |
1209 | if (insn->n == 3) | |
1210 | return 0; | |
1211 | break; | |
1212 | case INSN_CONFIG_PWM_OUTPUT: | |
1213 | case INSN_CONFIG_ANALOG_TRIG: | |
1214 | if (insn->n == 5) | |
1215 | return 0; | |
1216 | break; | |
b0a2b6d8 IA |
1217 | case INSN_CONFIG_DIGITAL_TRIG: |
1218 | if (insn->n == 6) | |
1219 | return 0; | |
1220 | break; | |
a2aab8b4 IA |
1221 | /* |
1222 | * by default we allow the insn since we don't have checks for | |
1223 | * all possible cases yet | |
1224 | */ | |
ed9eccbe | 1225 | default: |
c2ad078b | 1226 | pr_warn("No check for data length of config insn id %i is implemented\n", |
4f870fe6 | 1227 | data[0]); |
c2ad078b HS |
1228 | pr_warn("Add a check to %s in %s\n", __func__, __FILE__); |
1229 | pr_warn("Assuming n=%i is correct\n", insn->n); | |
ed9eccbe | 1230 | return 0; |
ed9eccbe DS |
1231 | } |
1232 | return -EINVAL; | |
1233 | } | |
1234 | ||
0a85b6f0 MT |
1235 | static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn, |
1236 | unsigned int *data, void *file) | |
ed9eccbe | 1237 | { |
34c43922 | 1238 | struct comedi_subdevice *s; |
ed9eccbe DS |
1239 | int ret = 0; |
1240 | int i; | |
1241 | ||
1242 | if (insn->insn & INSN_MASK_SPECIAL) { | |
1243 | /* a non-subdevice instruction */ | |
1244 | ||
1245 | switch (insn->insn) { | |
1246 | case INSN_GTOD: | |
1247 | { | |
1248 | struct timeval tv; | |
1249 | ||
1250 | if (insn->n != 2) { | |
1251 | ret = -EINVAL; | |
1252 | break; | |
1253 | } | |
1254 | ||
1255 | do_gettimeofday(&tv); | |
1256 | data[0] = tv.tv_sec; | |
1257 | data[1] = tv.tv_usec; | |
1258 | ret = 2; | |
1259 | ||
1260 | break; | |
1261 | } | |
1262 | case INSN_WAIT: | |
1263 | if (insn->n != 1 || data[0] >= 100000) { | |
1264 | ret = -EINVAL; | |
1265 | break; | |
1266 | } | |
1267 | udelay(data[0] / 1000); | |
1268 | ret = 1; | |
1269 | break; | |
1270 | case INSN_INTTRIG: | |
1271 | if (insn->n != 1) { | |
1272 | ret = -EINVAL; | |
1273 | break; | |
1274 | } | |
1275 | if (insn->subdev >= dev->n_subdevices) { | |
272850f0 HS |
1276 | dev_dbg(dev->class_dev, |
1277 | "%d not usable subdevice\n", | |
ed9eccbe DS |
1278 | insn->subdev); |
1279 | ret = -EINVAL; | |
1280 | break; | |
1281 | } | |
b077f2cd | 1282 | s = &dev->subdevices[insn->subdev]; |
ed9eccbe | 1283 | if (!s->async) { |
272850f0 | 1284 | dev_dbg(dev->class_dev, "no async\n"); |
ed9eccbe DS |
1285 | ret = -EINVAL; |
1286 | break; | |
1287 | } | |
1288 | if (!s->async->inttrig) { | |
272850f0 | 1289 | dev_dbg(dev->class_dev, "no inttrig\n"); |
ed9eccbe DS |
1290 | ret = -EAGAIN; |
1291 | break; | |
1292 | } | |
5d06e3df | 1293 | ret = s->async->inttrig(dev, s, data[0]); |
ed9eccbe DS |
1294 | if (ret >= 0) |
1295 | ret = 1; | |
1296 | break; | |
1297 | default: | |
272850f0 | 1298 | dev_dbg(dev->class_dev, "invalid insn\n"); |
ed9eccbe DS |
1299 | ret = -EINVAL; |
1300 | break; | |
1301 | } | |
1302 | } else { | |
1303 | /* a subdevice instruction */ | |
790c5541 | 1304 | unsigned int maxdata; |
ed9eccbe DS |
1305 | |
1306 | if (insn->subdev >= dev->n_subdevices) { | |
272850f0 HS |
1307 | dev_dbg(dev->class_dev, "subdevice %d out of range\n", |
1308 | insn->subdev); | |
ed9eccbe DS |
1309 | ret = -EINVAL; |
1310 | goto out; | |
1311 | } | |
b077f2cd | 1312 | s = &dev->subdevices[insn->subdev]; |
ed9eccbe DS |
1313 | |
1314 | if (s->type == COMEDI_SUBD_UNUSED) { | |
272850f0 HS |
1315 | dev_dbg(dev->class_dev, "%d not usable subdevice\n", |
1316 | insn->subdev); | |
ed9eccbe DS |
1317 | ret = -EIO; |
1318 | goto out; | |
1319 | } | |
1320 | ||
1321 | /* are we locked? (ioctl lock) */ | |
1322 | if (s->lock && s->lock != file) { | |
272850f0 | 1323 | dev_dbg(dev->class_dev, "device locked\n"); |
ed9eccbe DS |
1324 | ret = -EACCES; |
1325 | goto out; | |
1326 | } | |
1327 | ||
0fd0ca75 | 1328 | ret = comedi_check_chanlist(s, 1, &insn->chanspec); |
476b8477 | 1329 | if (ret < 0) { |
ed9eccbe | 1330 | ret = -EINVAL; |
272850f0 | 1331 | dev_dbg(dev->class_dev, "bad chanspec\n"); |
ed9eccbe DS |
1332 | goto out; |
1333 | } | |
1334 | ||
1335 | if (s->busy) { | |
1336 | ret = -EBUSY; | |
1337 | goto out; | |
1338 | } | |
1339 | /* This looks arbitrary. It is. */ | |
1340 | s->busy = &parse_insn; | |
1341 | switch (insn->insn) { | |
1342 | case INSN_READ: | |
1343 | ret = s->insn_read(dev, s, insn, data); | |
22ca19d9 HS |
1344 | if (ret == -ETIMEDOUT) { |
1345 | dev_dbg(dev->class_dev, | |
1346 | "subdevice %d read instruction timed out\n", | |
1347 | s->index); | |
1348 | } | |
ed9eccbe DS |
1349 | break; |
1350 | case INSN_WRITE: | |
1351 | maxdata = s->maxdata_list | |
476b8477 GKH |
1352 | ? s->maxdata_list[CR_CHAN(insn->chanspec)] |
1353 | : s->maxdata; | |
ed9eccbe DS |
1354 | for (i = 0; i < insn->n; ++i) { |
1355 | if (data[i] > maxdata) { | |
1356 | ret = -EINVAL; | |
272850f0 HS |
1357 | dev_dbg(dev->class_dev, |
1358 | "bad data value(s)\n"); | |
ed9eccbe DS |
1359 | break; |
1360 | } | |
1361 | } | |
22ca19d9 | 1362 | if (ret == 0) { |
ed9eccbe | 1363 | ret = s->insn_write(dev, s, insn, data); |
22ca19d9 HS |
1364 | if (ret == -ETIMEDOUT) { |
1365 | dev_dbg(dev->class_dev, | |
1366 | "subdevice %d write instruction timed out\n", | |
1367 | s->index); | |
1368 | } | |
1369 | } | |
ed9eccbe DS |
1370 | break; |
1371 | case INSN_BITS: | |
1372 | if (insn->n != 2) { | |
1373 | ret = -EINVAL; | |
2f644ccf | 1374 | } else { |
a2aab8b4 IA |
1375 | /* |
1376 | * Most drivers ignore the base channel in | |
2f644ccf | 1377 | * insn->chanspec. Fix this here if |
a2aab8b4 IA |
1378 | * the subdevice has <= 32 channels. |
1379 | */ | |
36efbacd HS |
1380 | unsigned int orig_mask = data[0]; |
1381 | unsigned int shift = 0; | |
2f644ccf | 1382 | |
2f644ccf IA |
1383 | if (s->n_chan <= 32) { |
1384 | shift = CR_CHAN(insn->chanspec); | |
1385 | if (shift > 0) { | |
1386 | insn->chanspec = 0; | |
1387 | data[0] <<= shift; | |
1388 | data[1] <<= shift; | |
1389 | } | |
36efbacd | 1390 | } |
2f644ccf IA |
1391 | ret = s->insn_bits(dev, s, insn, data); |
1392 | data[0] = orig_mask; | |
1393 | if (shift > 0) | |
1394 | data[1] >>= shift; | |
ed9eccbe | 1395 | } |
ed9eccbe DS |
1396 | break; |
1397 | case INSN_CONFIG: | |
1398 | ret = check_insn_config_length(insn, data); | |
1399 | if (ret) | |
1400 | break; | |
1401 | ret = s->insn_config(dev, s, insn, data); | |
1402 | break; | |
1403 | default: | |
1404 | ret = -EINVAL; | |
1405 | break; | |
1406 | } | |
1407 | ||
1408 | s->busy = NULL; | |
1409 | } | |
1410 | ||
476b8477 | 1411 | out: |
ed9eccbe DS |
1412 | return ret; |
1413 | } | |
1414 | ||
5b6cbd87 | 1415 | /* |
18e01b24 IA |
1416 | * COMEDI_INSNLIST ioctl |
1417 | * synchronous instruction list | |
5b6cbd87 | 1418 | * |
18e01b24 IA |
1419 | * arg: |
1420 | * pointer to comedi_insnlist structure | |
5b6cbd87 | 1421 | * |
18e01b24 IA |
1422 | * reads: |
1423 | * comedi_insnlist structure | |
1424 | * array of comedi_insn structures from insnlist->insns pointer | |
1425 | * data (for writes) from insns[].data pointers | |
5b6cbd87 | 1426 | * |
18e01b24 IA |
1427 | * writes: |
1428 | * data (for reads) to insns[].data pointers | |
5b6cbd87 HS |
1429 | */ |
1430 | /* arbitrary limits */ | |
1431 | #define MAX_SAMPLES 256 | |
1432 | static int do_insnlist_ioctl(struct comedi_device *dev, | |
1433 | struct comedi_insnlist __user *arg, void *file) | |
1434 | { | |
1435 | struct comedi_insnlist insnlist; | |
1436 | struct comedi_insn *insns = NULL; | |
1437 | unsigned int *data = NULL; | |
1438 | int i = 0; | |
1439 | int ret = 0; | |
1440 | ||
1441 | if (copy_from_user(&insnlist, arg, sizeof(insnlist))) | |
1442 | return -EFAULT; | |
1443 | ||
f4a8f528 | 1444 | data = kmalloc_array(MAX_SAMPLES, sizeof(unsigned int), GFP_KERNEL); |
5b6cbd87 | 1445 | if (!data) { |
5b6cbd87 HS |
1446 | ret = -ENOMEM; |
1447 | goto error; | |
1448 | } | |
1449 | ||
1450 | insns = kcalloc(insnlist.n_insns, sizeof(*insns), GFP_KERNEL); | |
1451 | if (!insns) { | |
5b6cbd87 HS |
1452 | ret = -ENOMEM; |
1453 | goto error; | |
1454 | } | |
1455 | ||
1456 | if (copy_from_user(insns, insnlist.insns, | |
1457 | sizeof(*insns) * insnlist.n_insns)) { | |
272850f0 | 1458 | dev_dbg(dev->class_dev, "copy_from_user failed\n"); |
5b6cbd87 HS |
1459 | ret = -EFAULT; |
1460 | goto error; | |
1461 | } | |
1462 | ||
1463 | for (i = 0; i < insnlist.n_insns; i++) { | |
1464 | if (insns[i].n > MAX_SAMPLES) { | |
272850f0 HS |
1465 | dev_dbg(dev->class_dev, |
1466 | "number of samples too large\n"); | |
5b6cbd87 HS |
1467 | ret = -EINVAL; |
1468 | goto error; | |
1469 | } | |
1470 | if (insns[i].insn & INSN_MASK_WRITE) { | |
1471 | if (copy_from_user(data, insns[i].data, | |
1472 | insns[i].n * sizeof(unsigned int))) { | |
272850f0 HS |
1473 | dev_dbg(dev->class_dev, |
1474 | "copy_from_user failed\n"); | |
5b6cbd87 HS |
1475 | ret = -EFAULT; |
1476 | goto error; | |
1477 | } | |
1478 | } | |
1479 | ret = parse_insn(dev, insns + i, data, file); | |
1480 | if (ret < 0) | |
1481 | goto error; | |
1482 | if (insns[i].insn & INSN_MASK_READ) { | |
1483 | if (copy_to_user(insns[i].data, data, | |
1484 | insns[i].n * sizeof(unsigned int))) { | |
272850f0 HS |
1485 | dev_dbg(dev->class_dev, |
1486 | "copy_to_user failed\n"); | |
5b6cbd87 HS |
1487 | ret = -EFAULT; |
1488 | goto error; | |
1489 | } | |
1490 | } | |
1491 | if (need_resched()) | |
1492 | schedule(); | |
1493 | } | |
1494 | ||
1495 | error: | |
1496 | kfree(insns); | |
1497 | kfree(data); | |
1498 | ||
1499 | if (ret < 0) | |
1500 | return ret; | |
1501 | return i; | |
1502 | } | |
1503 | ||
ed9eccbe | 1504 | /* |
18e01b24 IA |
1505 | * COMEDI_INSN ioctl |
1506 | * synchronous instruction | |
ed9eccbe | 1507 | * |
18e01b24 IA |
1508 | * arg: |
1509 | * pointer to comedi_insn structure | |
ed9eccbe | 1510 | * |
18e01b24 IA |
1511 | * reads: |
1512 | * comedi_insn structure | |
1513 | * data (for writes) from insn->data pointer | |
ed9eccbe | 1514 | * |
18e01b24 IA |
1515 | * writes: |
1516 | * data (for reads) to insn->data pointer | |
ed9eccbe | 1517 | */ |
92d0127c GKH |
1518 | static int do_insn_ioctl(struct comedi_device *dev, |
1519 | struct comedi_insn __user *arg, void *file) | |
ed9eccbe | 1520 | { |
90035c08 | 1521 | struct comedi_insn insn; |
790c5541 | 1522 | unsigned int *data = NULL; |
ed9eccbe DS |
1523 | int ret = 0; |
1524 | ||
f4a8f528 | 1525 | data = kmalloc_array(MAX_SAMPLES, sizeof(unsigned int), GFP_KERNEL); |
ed9eccbe DS |
1526 | if (!data) { |
1527 | ret = -ENOMEM; | |
1528 | goto error; | |
1529 | } | |
1530 | ||
bc252fd1 | 1531 | if (copy_from_user(&insn, arg, sizeof(insn))) { |
ed9eccbe DS |
1532 | ret = -EFAULT; |
1533 | goto error; | |
1534 | } | |
1535 | ||
1536 | /* This is where the behavior of insn and insnlist deviate. */ | |
1537 | if (insn.n > MAX_SAMPLES) | |
1538 | insn.n = MAX_SAMPLES; | |
1539 | if (insn.insn & INSN_MASK_WRITE) { | |
21fe2eea M |
1540 | if (copy_from_user(data, |
1541 | insn.data, | |
1542 | insn.n * sizeof(unsigned int))) { | |
ed9eccbe DS |
1543 | ret = -EFAULT; |
1544 | goto error; | |
1545 | } | |
1546 | } | |
1547 | ret = parse_insn(dev, &insn, data, file); | |
1548 | if (ret < 0) | |
1549 | goto error; | |
1550 | if (insn.insn & INSN_MASK_READ) { | |
21fe2eea M |
1551 | if (copy_to_user(insn.data, |
1552 | data, | |
1553 | insn.n * sizeof(unsigned int))) { | |
ed9eccbe DS |
1554 | ret = -EFAULT; |
1555 | goto error; | |
1556 | } | |
1557 | } | |
1558 | ret = insn.n; | |
1559 | ||
476b8477 GKH |
1560 | error: |
1561 | kfree(data); | |
ed9eccbe DS |
1562 | |
1563 | return ret; | |
1564 | } | |
1565 | ||
87ece583 HS |
1566 | static int __comedi_get_user_cmd(struct comedi_device *dev, |
1567 | struct comedi_cmd __user *arg, | |
1568 | struct comedi_cmd *cmd) | |
ed9eccbe | 1569 | { |
34c43922 | 1570 | struct comedi_subdevice *s; |
ed9eccbe | 1571 | |
87ece583 | 1572 | if (copy_from_user(cmd, arg, sizeof(*cmd))) { |
272850f0 | 1573 | dev_dbg(dev->class_dev, "bad cmd address\n"); |
ed9eccbe DS |
1574 | return -EFAULT; |
1575 | } | |
ed9eccbe | 1576 | |
87ece583 HS |
1577 | if (cmd->subdev >= dev->n_subdevices) { |
1578 | dev_dbg(dev->class_dev, "%d no such subdevice\n", cmd->subdev); | |
ed9eccbe DS |
1579 | return -ENODEV; |
1580 | } | |
1581 | ||
87ece583 | 1582 | s = &dev->subdevices[cmd->subdev]; |
ed9eccbe DS |
1583 | |
1584 | if (s->type == COMEDI_SUBD_UNUSED) { | |
b2f48741 YD |
1585 | dev_dbg(dev->class_dev, "%d not valid subdevice\n", |
1586 | cmd->subdev); | |
ed9eccbe DS |
1587 | return -EIO; |
1588 | } | |
1589 | ||
1590 | if (!s->do_cmd || !s->do_cmdtest || !s->async) { | |
272850f0 | 1591 | dev_dbg(dev->class_dev, |
b2f48741 YD |
1592 | "subdevice %d does not support commands\n", |
1593 | cmd->subdev); | |
ed9eccbe DS |
1594 | return -EIO; |
1595 | } | |
1596 | ||
87ece583 HS |
1597 | /* make sure channel/gain list isn't too long */ |
1598 | if (cmd->chanlist_len > s->len_chanlist) { | |
1599 | dev_dbg(dev->class_dev, "channel/gain list too long %d > %d\n", | |
1600 | cmd->chanlist_len, s->len_chanlist); | |
1601 | return -EINVAL; | |
1602 | } | |
1603 | ||
5d070cf2 IA |
1604 | /* |
1605 | * Set the CMDF_WRITE flag to the correct state if the subdevice | |
1606 | * supports only "read" commands or only "write" commands. | |
1607 | */ | |
1608 | switch (s->subdev_flags & (SDF_CMD_READ | SDF_CMD_WRITE)) { | |
1609 | case SDF_CMD_READ: | |
1610 | cmd->flags &= ~CMDF_WRITE; | |
1611 | break; | |
1612 | case SDF_CMD_WRITE: | |
1613 | cmd->flags |= CMDF_WRITE; | |
1614 | break; | |
1615 | default: | |
1616 | break; | |
1617 | } | |
1618 | ||
87ece583 HS |
1619 | return 0; |
1620 | } | |
1621 | ||
c6cd0eef HS |
1622 | static int __comedi_get_user_chanlist(struct comedi_device *dev, |
1623 | struct comedi_subdevice *s, | |
1624 | unsigned int __user *user_chanlist, | |
1625 | struct comedi_cmd *cmd) | |
1626 | { | |
1627 | unsigned int *chanlist; | |
1628 | int ret; | |
1629 | ||
238b5ad8 | 1630 | cmd->chanlist = NULL; |
c6cd0eef HS |
1631 | chanlist = memdup_user(user_chanlist, |
1632 | cmd->chanlist_len * sizeof(unsigned int)); | |
1633 | if (IS_ERR(chanlist)) | |
1634 | return PTR_ERR(chanlist); | |
1635 | ||
1636 | /* make sure each element in channel/gain list is valid */ | |
1637 | ret = comedi_check_chanlist(s, cmd->chanlist_len, chanlist); | |
1638 | if (ret < 0) { | |
1639 | kfree(chanlist); | |
1640 | return ret; | |
1641 | } | |
1642 | ||
1643 | cmd->chanlist = chanlist; | |
1644 | ||
1645 | return 0; | |
1646 | } | |
1647 | ||
18e01b24 IA |
1648 | /* |
1649 | * COMEDI_CMD ioctl | |
1650 | * asynchronous acquisition command set-up | |
1651 | * | |
1652 | * arg: | |
1653 | * pointer to comedi_cmd structure | |
1654 | * | |
1655 | * reads: | |
1656 | * comedi_cmd structure | |
1657 | * channel/range list from cmd->chanlist pointer | |
1658 | * | |
1659 | * writes: | |
1660 | * possibly modified comedi_cmd structure (when -EAGAIN returned) | |
1661 | */ | |
87ece583 HS |
1662 | static int do_cmd_ioctl(struct comedi_device *dev, |
1663 | struct comedi_cmd __user *arg, void *file) | |
1664 | { | |
1665 | struct comedi_cmd cmd; | |
1666 | struct comedi_subdevice *s; | |
1667 | struct comedi_async *async; | |
1668 | unsigned int __user *user_chanlist; | |
1669 | int ret; | |
1670 | ||
1671 | /* get the user's cmd and do some simple validation */ | |
1672 | ret = __comedi_get_user_cmd(dev, arg, &cmd); | |
1673 | if (ret) | |
1674 | return ret; | |
1675 | ||
1676 | /* save user's chanlist pointer so it can be restored later */ | |
1677 | user_chanlist = (unsigned int __user *)cmd.chanlist; | |
1678 | ||
1679 | s = &dev->subdevices[cmd.subdev]; | |
1680 | async = s->async; | |
1681 | ||
ed9eccbe DS |
1682 | /* are we locked? (ioctl lock) */ |
1683 | if (s->lock && s->lock != file) { | |
272850f0 | 1684 | dev_dbg(dev->class_dev, "subdevice locked\n"); |
ed9eccbe DS |
1685 | return -EACCES; |
1686 | } | |
1687 | ||
1688 | /* are we busy? */ | |
1689 | if (s->busy) { | |
272850f0 | 1690 | dev_dbg(dev->class_dev, "subdevice busy\n"); |
ed9eccbe DS |
1691 | return -EBUSY; |
1692 | } | |
ed9eccbe | 1693 | |
ed9eccbe | 1694 | /* make sure channel/gain list isn't too short */ |
88bc0574 | 1695 | if (cmd.chanlist_len < 1) { |
272850f0 | 1696 | dev_dbg(dev->class_dev, "channel/gain list too short %u < 1\n", |
88bc0574 | 1697 | cmd.chanlist_len); |
4b18f08b | 1698 | return -EINVAL; |
ed9eccbe DS |
1699 | } |
1700 | ||
88bc0574 | 1701 | async->cmd = cmd; |
ed9eccbe | 1702 | async->cmd.data = NULL; |
ed9eccbe | 1703 | |
c6cd0eef HS |
1704 | /* load channel/gain list */ |
1705 | ret = __comedi_get_user_chanlist(dev, s, user_chanlist, &async->cmd); | |
1706 | if (ret) | |
ed9eccbe | 1707 | goto cleanup; |
ed9eccbe DS |
1708 | |
1709 | ret = s->do_cmdtest(dev, s, &async->cmd); | |
1710 | ||
b0446a21 | 1711 | if (async->cmd.flags & CMDF_BOGUS || ret) { |
272850f0 | 1712 | dev_dbg(dev->class_dev, "test returned %d\n", ret); |
88bc0574 | 1713 | cmd = async->cmd; |
476b8477 | 1714 | /* restore chanlist pointer before copying back */ |
95bc359f | 1715 | cmd.chanlist = (unsigned int __force *)user_chanlist; |
88bc0574 | 1716 | cmd.data = NULL; |
bc252fd1 | 1717 | if (copy_to_user(arg, &cmd, sizeof(cmd))) { |
272850f0 | 1718 | dev_dbg(dev->class_dev, "fault writing cmd\n"); |
ed9eccbe DS |
1719 | ret = -EFAULT; |
1720 | goto cleanup; | |
1721 | } | |
1722 | ret = -EAGAIN; | |
1723 | goto cleanup; | |
1724 | } | |
1725 | ||
1726 | if (!async->prealloc_bufsz) { | |
1727 | ret = -ENOMEM; | |
272850f0 | 1728 | dev_dbg(dev->class_dev, "no buffer (?)\n"); |
ed9eccbe DS |
1729 | goto cleanup; |
1730 | } | |
1731 | ||
fcc18a9a | 1732 | comedi_buf_reset(s); |
ed9eccbe | 1733 | |
781f933c | 1734 | async->cb_mask = COMEDI_CB_BLOCK | COMEDI_CB_CANCEL_MASK; |
d8bff6e3 | 1735 | if (async->cmd.flags & CMDF_WAKE_EOS) |
ed9eccbe | 1736 | async->cb_mask |= COMEDI_CB_EOS; |
ed9eccbe | 1737 | |
cc64ea42 IA |
1738 | comedi_update_subdevice_runflags(s, COMEDI_SRF_BUSY_MASK, |
1739 | COMEDI_SRF_RUNNING); | |
ed9eccbe | 1740 | |
84bb0bcc HS |
1741 | /* |
1742 | * Set s->busy _after_ setting COMEDI_SRF_RUNNING flag to avoid | |
1743 | * race with comedi_read() or comedi_write(). | |
1744 | */ | |
4b18f08b | 1745 | s->busy = file; |
ed9eccbe DS |
1746 | ret = s->do_cmd(dev, s); |
1747 | if (ret == 0) | |
1748 | return 0; | |
1749 | ||
476b8477 | 1750 | cleanup: |
ed9eccbe DS |
1751 | do_become_nonbusy(dev, s); |
1752 | ||
1753 | return ret; | |
1754 | } | |
1755 | ||
1756 | /* | |
18e01b24 | 1757 | * COMEDI_CMDTEST ioctl |
69e98df7 | 1758 | * asynchronous acquisition command testing |
18e01b24 IA |
1759 | * |
1760 | * arg: | |
1761 | * pointer to comedi_cmd structure | |
1762 | * | |
1763 | * reads: | |
1764 | * comedi_cmd structure | |
1765 | * channel/range list from cmd->chanlist pointer | |
1766 | * | |
1767 | * writes: | |
1768 | * possibly modified comedi_cmd structure | |
1769 | */ | |
92d0127c GKH |
1770 | static int do_cmdtest_ioctl(struct comedi_device *dev, |
1771 | struct comedi_cmd __user *arg, void *file) | |
ed9eccbe | 1772 | { |
f8348677 | 1773 | struct comedi_cmd cmd; |
34c43922 | 1774 | struct comedi_subdevice *s; |
95bc359f | 1775 | unsigned int __user *user_chanlist; |
87ece583 HS |
1776 | int ret; |
1777 | ||
1778 | /* get the user's cmd and do some simple validation */ | |
1779 | ret = __comedi_get_user_cmd(dev, arg, &cmd); | |
1780 | if (ret) | |
1781 | return ret; | |
ed9eccbe | 1782 | |
476b8477 | 1783 | /* save user's chanlist pointer so it can be restored later */ |
95bc359f | 1784 | user_chanlist = (unsigned int __user *)cmd.chanlist; |
ed9eccbe | 1785 | |
f8348677 | 1786 | s = &dev->subdevices[cmd.subdev]; |
ed9eccbe | 1787 | |
6cab7a37 IA |
1788 | /* user_chanlist can be NULL for COMEDI_CMDTEST ioctl */ |
1789 | if (user_chanlist) { | |
1790 | /* load channel/gain list */ | |
1791 | ret = __comedi_get_user_chanlist(dev, s, user_chanlist, &cmd); | |
1792 | if (ret) | |
1793 | return ret; | |
1794 | } | |
ed9eccbe | 1795 | |
f8348677 | 1796 | ret = s->do_cmdtest(dev, s, &cmd); |
ed9eccbe | 1797 | |
238b5ad8 IA |
1798 | kfree(cmd.chanlist); /* free kernel copy of user chanlist */ |
1799 | ||
476b8477 | 1800 | /* restore chanlist pointer before copying back */ |
95bc359f | 1801 | cmd.chanlist = (unsigned int __force *)user_chanlist; |
ed9eccbe | 1802 | |
bc252fd1 | 1803 | if (copy_to_user(arg, &cmd, sizeof(cmd))) { |
272850f0 | 1804 | dev_dbg(dev->class_dev, "bad cmd address\n"); |
ed9eccbe | 1805 | ret = -EFAULT; |
ed9eccbe | 1806 | } |
c6cd0eef | 1807 | |
ed9eccbe DS |
1808 | return ret; |
1809 | } | |
1810 | ||
1811 | /* | |
18e01b24 IA |
1812 | * COMEDI_LOCK ioctl |
1813 | * lock subdevice | |
1814 | * | |
1815 | * arg: | |
1816 | * subdevice number | |
1817 | * | |
1818 | * reads: | |
1819 | * nothing | |
1820 | * | |
1821 | * writes: | |
1822 | * nothing | |
1823 | */ | |
c1a6eac1 | 1824 | static int do_lock_ioctl(struct comedi_device *dev, unsigned long arg, |
0a85b6f0 | 1825 | void *file) |
ed9eccbe DS |
1826 | { |
1827 | int ret = 0; | |
1828 | unsigned long flags; | |
34c43922 | 1829 | struct comedi_subdevice *s; |
ed9eccbe DS |
1830 | |
1831 | if (arg >= dev->n_subdevices) | |
1832 | return -EINVAL; | |
b077f2cd | 1833 | s = &dev->subdevices[arg]; |
ed9eccbe | 1834 | |
5f74ea14 | 1835 | spin_lock_irqsave(&s->spin_lock, flags); |
476b8477 | 1836 | if (s->busy || s->lock) |
ed9eccbe | 1837 | ret = -EBUSY; |
476b8477 | 1838 | else |
ed9eccbe | 1839 | s->lock = file; |
5f74ea14 | 1840 | spin_unlock_irqrestore(&s->spin_lock, flags); |
ed9eccbe | 1841 | |
ed9eccbe DS |
1842 | return ret; |
1843 | } | |
1844 | ||
1845 | /* | |
18e01b24 IA |
1846 | * COMEDI_UNLOCK ioctl |
1847 | * unlock subdevice | |
1848 | * | |
1849 | * arg: | |
1850 | * subdevice number | |
1851 | * | |
1852 | * reads: | |
1853 | * nothing | |
1854 | * | |
1855 | * writes: | |
1856 | * nothing | |
1857 | */ | |
c1a6eac1 | 1858 | static int do_unlock_ioctl(struct comedi_device *dev, unsigned long arg, |
0a85b6f0 | 1859 | void *file) |
ed9eccbe | 1860 | { |
34c43922 | 1861 | struct comedi_subdevice *s; |
ed9eccbe DS |
1862 | |
1863 | if (arg >= dev->n_subdevices) | |
1864 | return -EINVAL; | |
b077f2cd | 1865 | s = &dev->subdevices[arg]; |
ed9eccbe DS |
1866 | |
1867 | if (s->busy) | |
1868 | return -EBUSY; | |
1869 | ||
1870 | if (s->lock && s->lock != file) | |
1871 | return -EACCES; | |
1872 | ||
90ac0764 | 1873 | if (s->lock == file) |
ed9eccbe | 1874 | s->lock = NULL; |
ed9eccbe DS |
1875 | |
1876 | return 0; | |
1877 | } | |
1878 | ||
1879 | /* | |
18e01b24 IA |
1880 | * COMEDI_CANCEL ioctl |
1881 | * cancel asynchronous acquisition | |
1882 | * | |
1883 | * arg: | |
1884 | * subdevice number | |
1885 | * | |
1886 | * reads: | |
1887 | * nothing | |
1888 | * | |
1889 | * writes: | |
1890 | * nothing | |
1891 | */ | |
c1a6eac1 | 1892 | static int do_cancel_ioctl(struct comedi_device *dev, unsigned long arg, |
0a85b6f0 | 1893 | void *file) |
ed9eccbe | 1894 | { |
34c43922 | 1895 | struct comedi_subdevice *s; |
ed9eccbe DS |
1896 | |
1897 | if (arg >= dev->n_subdevices) | |
1898 | return -EINVAL; | |
b077f2cd | 1899 | s = &dev->subdevices[arg]; |
88cc30cf | 1900 | if (!s->async) |
ed9eccbe DS |
1901 | return -EINVAL; |
1902 | ||
ed9eccbe DS |
1903 | if (!s->busy) |
1904 | return 0; | |
1905 | ||
1906 | if (s->busy != file) | |
1907 | return -EBUSY; | |
1908 | ||
fe43ec53 | 1909 | return do_cancel(dev, s); |
ed9eccbe DS |
1910 | } |
1911 | ||
1912 | /* | |
18e01b24 IA |
1913 | * COMEDI_POLL ioctl |
1914 | * instructs driver to synchronize buffers | |
1915 | * | |
1916 | * arg: | |
1917 | * subdevice number | |
1918 | * | |
1919 | * reads: | |
1920 | * nothing | |
1921 | * | |
1922 | * writes: | |
1923 | * nothing | |
1924 | */ | |
c1a6eac1 | 1925 | static int do_poll_ioctl(struct comedi_device *dev, unsigned long arg, |
0a85b6f0 | 1926 | void *file) |
ed9eccbe | 1927 | { |
34c43922 | 1928 | struct comedi_subdevice *s; |
ed9eccbe DS |
1929 | |
1930 | if (arg >= dev->n_subdevices) | |
1931 | return -EINVAL; | |
b077f2cd | 1932 | s = &dev->subdevices[arg]; |
ed9eccbe | 1933 | |
ed9eccbe DS |
1934 | if (!s->busy) |
1935 | return 0; | |
1936 | ||
1937 | if (s->busy != file) | |
1938 | return -EBUSY; | |
1939 | ||
1940 | if (s->poll) | |
1941 | return s->poll(dev, s); | |
1942 | ||
1943 | return -EINVAL; | |
1944 | } | |
1945 | ||
c299a678 IA |
1946 | /* |
1947 | * COMEDI_SETRSUBD ioctl | |
1948 | * sets the current "read" subdevice on a per-file basis | |
1949 | * | |
1950 | * arg: | |
1951 | * subdevice number | |
1952 | * | |
1953 | * reads: | |
1954 | * nothing | |
1955 | * | |
1956 | * writes: | |
1957 | * nothing | |
1958 | */ | |
1959 | static int do_setrsubd_ioctl(struct comedi_device *dev, unsigned long arg, | |
1960 | struct file *file) | |
1961 | { | |
1962 | struct comedi_file *cfp = file->private_data; | |
1963 | struct comedi_subdevice *s_old, *s_new; | |
1964 | ||
1965 | if (arg >= dev->n_subdevices) | |
1966 | return -EINVAL; | |
1967 | ||
1968 | s_new = &dev->subdevices[arg]; | |
1969 | s_old = comedi_file_read_subdevice(file); | |
1970 | if (s_old == s_new) | |
1971 | return 0; /* no change */ | |
1972 | ||
1973 | if (!(s_new->subdev_flags & SDF_CMD_READ)) | |
1974 | return -EINVAL; | |
1975 | ||
1976 | /* | |
1977 | * Check the file isn't still busy handling a "read" command on the | |
1978 | * old subdevice (if any). | |
1979 | */ | |
1980 | if (s_old && s_old->busy == file && s_old->async && | |
1981 | !(s_old->async->cmd.flags & CMDF_WRITE)) | |
1982 | return -EBUSY; | |
1983 | ||
1984 | ACCESS_ONCE(cfp->read_subdev) = s_new; | |
1985 | return 0; | |
1986 | } | |
1987 | ||
1988 | /* | |
1989 | * COMEDI_SETWSUBD ioctl | |
1990 | * sets the current "write" subdevice on a per-file basis | |
1991 | * | |
1992 | * arg: | |
1993 | * subdevice number | |
1994 | * | |
1995 | * reads: | |
1996 | * nothing | |
1997 | * | |
1998 | * writes: | |
1999 | * nothing | |
2000 | */ | |
2001 | static int do_setwsubd_ioctl(struct comedi_device *dev, unsigned long arg, | |
2002 | struct file *file) | |
2003 | { | |
2004 | struct comedi_file *cfp = file->private_data; | |
2005 | struct comedi_subdevice *s_old, *s_new; | |
2006 | ||
2007 | if (arg >= dev->n_subdevices) | |
2008 | return -EINVAL; | |
2009 | ||
2010 | s_new = &dev->subdevices[arg]; | |
2011 | s_old = comedi_file_write_subdevice(file); | |
2012 | if (s_old == s_new) | |
2013 | return 0; /* no change */ | |
2014 | ||
2015 | if (!(s_new->subdev_flags & SDF_CMD_WRITE)) | |
2016 | return -EINVAL; | |
2017 | ||
2018 | /* | |
2019 | * Check the file isn't still busy handling a "write" command on the | |
2020 | * old subdevice (if any). | |
2021 | */ | |
2022 | if (s_old && s_old->busy == file && s_old->async && | |
2023 | (s_old->async->cmd.flags & CMDF_WRITE)) | |
2024 | return -EBUSY; | |
2025 | ||
2026 | ACCESS_ONCE(cfp->write_subdev) = s_new; | |
2027 | return 0; | |
2028 | } | |
2029 | ||
47db6d58 HS |
2030 | static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd, |
2031 | unsigned long arg) | |
2032 | { | |
20f083c0 IA |
2033 | unsigned minor = iminor(file_inode(file)); |
2034 | struct comedi_file *cfp = file->private_data; | |
2035 | struct comedi_device *dev = cfp->dev; | |
47db6d58 HS |
2036 | int rc; |
2037 | ||
47db6d58 HS |
2038 | mutex_lock(&dev->mutex); |
2039 | ||
a2aab8b4 IA |
2040 | /* |
2041 | * Device config is special, because it must work on | |
2042 | * an unconfigured device. | |
2043 | */ | |
47db6d58 | 2044 | if (cmd == COMEDI_DEVCONFIG) { |
754ab5c0 IA |
2045 | if (minor >= COMEDI_NUM_BOARD_MINORS) { |
2046 | /* Device config not appropriate on non-board minors. */ | |
2047 | rc = -ENOTTY; | |
2048 | goto done; | |
2049 | } | |
47db6d58 HS |
2050 | rc = do_devconfig_ioctl(dev, |
2051 | (struct comedi_devconfig __user *)arg); | |
8ab4ed6e IA |
2052 | if (rc == 0) { |
2053 | if (arg == 0 && | |
2054 | dev->minor >= comedi_num_legacy_minors) { | |
a2aab8b4 IA |
2055 | /* |
2056 | * Successfully unconfigured a dynamically | |
2057 | * allocated device. Try and remove it. | |
2058 | */ | |
db210da2 | 2059 | if (comedi_clear_board_dev(dev)) { |
8ab4ed6e | 2060 | mutex_unlock(&dev->mutex); |
cb6b79de | 2061 | comedi_free_board_dev(dev); |
8ab4ed6e IA |
2062 | return rc; |
2063 | } | |
2064 | } | |
2065 | } | |
47db6d58 HS |
2066 | goto done; |
2067 | } | |
2068 | ||
2069 | if (!dev->attached) { | |
272850f0 | 2070 | dev_dbg(dev->class_dev, "no driver attached\n"); |
47db6d58 HS |
2071 | rc = -ENODEV; |
2072 | goto done; | |
2073 | } | |
2074 | ||
2075 | switch (cmd) { | |
2076 | case COMEDI_BUFCONFIG: | |
2077 | rc = do_bufconfig_ioctl(dev, | |
2078 | (struct comedi_bufconfig __user *)arg); | |
2079 | break; | |
2080 | case COMEDI_DEVINFO: | |
2081 | rc = do_devinfo_ioctl(dev, (struct comedi_devinfo __user *)arg, | |
2082 | file); | |
2083 | break; | |
2084 | case COMEDI_SUBDINFO: | |
2085 | rc = do_subdinfo_ioctl(dev, | |
2086 | (struct comedi_subdinfo __user *)arg, | |
2087 | file); | |
2088 | break; | |
2089 | case COMEDI_CHANINFO: | |
2090 | rc = do_chaninfo_ioctl(dev, (void __user *)arg); | |
2091 | break; | |
2092 | case COMEDI_RANGEINFO: | |
2093 | rc = do_rangeinfo_ioctl(dev, (void __user *)arg); | |
2094 | break; | |
2095 | case COMEDI_BUFINFO: | |
2096 | rc = do_bufinfo_ioctl(dev, | |
2097 | (struct comedi_bufinfo __user *)arg, | |
2098 | file); | |
2099 | break; | |
2100 | case COMEDI_LOCK: | |
2101 | rc = do_lock_ioctl(dev, arg, file); | |
2102 | break; | |
2103 | case COMEDI_UNLOCK: | |
2104 | rc = do_unlock_ioctl(dev, arg, file); | |
2105 | break; | |
2106 | case COMEDI_CANCEL: | |
2107 | rc = do_cancel_ioctl(dev, arg, file); | |
2108 | break; | |
2109 | case COMEDI_CMD: | |
2110 | rc = do_cmd_ioctl(dev, (struct comedi_cmd __user *)arg, file); | |
2111 | break; | |
2112 | case COMEDI_CMDTEST: | |
2113 | rc = do_cmdtest_ioctl(dev, (struct comedi_cmd __user *)arg, | |
2114 | file); | |
2115 | break; | |
2116 | case COMEDI_INSNLIST: | |
2117 | rc = do_insnlist_ioctl(dev, | |
2118 | (struct comedi_insnlist __user *)arg, | |
2119 | file); | |
2120 | break; | |
2121 | case COMEDI_INSN: | |
2122 | rc = do_insn_ioctl(dev, (struct comedi_insn __user *)arg, | |
2123 | file); | |
2124 | break; | |
2125 | case COMEDI_POLL: | |
2126 | rc = do_poll_ioctl(dev, arg, file); | |
2127 | break; | |
c299a678 IA |
2128 | case COMEDI_SETRSUBD: |
2129 | rc = do_setrsubd_ioctl(dev, arg, file); | |
2130 | break; | |
2131 | case COMEDI_SETWSUBD: | |
2132 | rc = do_setwsubd_ioctl(dev, arg, file); | |
2133 | break; | |
47db6d58 HS |
2134 | default: |
2135 | rc = -ENOTTY; | |
2136 | break; | |
2137 | } | |
2138 | ||
2139 | done: | |
2140 | mutex_unlock(&dev->mutex); | |
2141 | return rc; | |
2142 | } | |
2143 | ||
df30b21c FV |
2144 | static void comedi_vm_open(struct vm_area_struct *area) |
2145 | { | |
af93da31 | 2146 | struct comedi_buf_map *bm; |
df30b21c | 2147 | |
af93da31 IA |
2148 | bm = area->vm_private_data; |
2149 | comedi_buf_map_get(bm); | |
df30b21c FV |
2150 | } |
2151 | ||
2152 | static void comedi_vm_close(struct vm_area_struct *area) | |
ed9eccbe | 2153 | { |
af93da31 | 2154 | struct comedi_buf_map *bm; |
ed9eccbe | 2155 | |
af93da31 IA |
2156 | bm = area->vm_private_data; |
2157 | comedi_buf_map_put(bm); | |
ed9eccbe DS |
2158 | } |
2159 | ||
2160 | static struct vm_operations_struct comedi_vm_ops = { | |
df30b21c FV |
2161 | .open = comedi_vm_open, |
2162 | .close = comedi_vm_close, | |
ed9eccbe DS |
2163 | }; |
2164 | ||
2165 | static int comedi_mmap(struct file *file, struct vm_area_struct *vma) | |
2166 | { | |
20f083c0 IA |
2167 | struct comedi_file *cfp = file->private_data; |
2168 | struct comedi_device *dev = cfp->dev; | |
a52840a9 HS |
2169 | struct comedi_subdevice *s; |
2170 | struct comedi_async *async; | |
b34aa86f | 2171 | struct comedi_buf_map *bm = NULL; |
ed9eccbe DS |
2172 | unsigned long start = vma->vm_start; |
2173 | unsigned long size; | |
2174 | int n_pages; | |
2175 | int i; | |
2176 | int retval; | |
3ffab428 | 2177 | |
b34aa86f IA |
2178 | /* |
2179 | * 'trylock' avoids circular dependency with current->mm->mmap_sem | |
2180 | * and down-reading &dev->attach_lock should normally succeed without | |
2181 | * contention unless the device is in the process of being attached | |
2182 | * or detached. | |
2183 | */ | |
2184 | if (!down_read_trylock(&dev->attach_lock)) | |
2185 | return -EAGAIN; | |
a52840a9 | 2186 | |
ed9eccbe | 2187 | if (!dev->attached) { |
272850f0 | 2188 | dev_dbg(dev->class_dev, "no driver attached\n"); |
ed9eccbe DS |
2189 | retval = -ENODEV; |
2190 | goto done; | |
2191 | } | |
a52840a9 | 2192 | |
476b8477 | 2193 | if (vma->vm_flags & VM_WRITE) |
20f083c0 | 2194 | s = comedi_file_write_subdevice(file); |
476b8477 | 2195 | else |
20f083c0 | 2196 | s = comedi_file_read_subdevice(file); |
a52840a9 | 2197 | if (!s) { |
ed9eccbe DS |
2198 | retval = -EINVAL; |
2199 | goto done; | |
2200 | } | |
a52840a9 | 2201 | |
ed9eccbe | 2202 | async = s->async; |
a52840a9 | 2203 | if (!async) { |
ed9eccbe DS |
2204 | retval = -EINVAL; |
2205 | goto done; | |
2206 | } | |
2207 | ||
2208 | if (vma->vm_pgoff != 0) { | |
272850f0 | 2209 | dev_dbg(dev->class_dev, "mmap() offset must be 0.\n"); |
ed9eccbe DS |
2210 | retval = -EINVAL; |
2211 | goto done; | |
2212 | } | |
2213 | ||
2214 | size = vma->vm_end - vma->vm_start; | |
2215 | if (size > async->prealloc_bufsz) { | |
2216 | retval = -EFAULT; | |
2217 | goto done; | |
2218 | } | |
2219 | if (size & (~PAGE_MASK)) { | |
2220 | retval = -EFAULT; | |
2221 | goto done; | |
2222 | } | |
2223 | ||
2224 | n_pages = size >> PAGE_SHIFT; | |
b34aa86f IA |
2225 | |
2226 | /* get reference to current buf map (if any) */ | |
2227 | bm = comedi_buf_map_from_subdev_get(s); | |
af93da31 IA |
2228 | if (!bm || n_pages > bm->n_pages) { |
2229 | retval = -EINVAL; | |
2230 | goto done; | |
2231 | } | |
ed9eccbe | 2232 | for (i = 0; i < n_pages; ++i) { |
af93da31 | 2233 | struct comedi_buf_page *buf = &bm->page_list[i]; |
a52840a9 | 2234 | |
ed9eccbe | 2235 | if (remap_pfn_range(vma, start, |
a52840a9 HS |
2236 | page_to_pfn(virt_to_page(buf->virt_addr)), |
2237 | PAGE_SIZE, PAGE_SHARED)) { | |
ed9eccbe DS |
2238 | retval = -EAGAIN; |
2239 | goto done; | |
2240 | } | |
2241 | start += PAGE_SIZE; | |
2242 | } | |
2243 | ||
2244 | vma->vm_ops = &comedi_vm_ops; | |
af93da31 | 2245 | vma->vm_private_data = bm; |
ed9eccbe | 2246 | |
af93da31 | 2247 | vma->vm_ops->open(vma); |
ed9eccbe DS |
2248 | |
2249 | retval = 0; | |
476b8477 | 2250 | done: |
b34aa86f IA |
2251 | up_read(&dev->attach_lock); |
2252 | comedi_buf_map_put(bm); /* put reference to buf map - okay if NULL */ | |
ed9eccbe DS |
2253 | return retval; |
2254 | } | |
2255 | ||
1ae5062a | 2256 | static unsigned int comedi_poll(struct file *file, poll_table *wait) |
ed9eccbe DS |
2257 | { |
2258 | unsigned int mask = 0; | |
20f083c0 IA |
2259 | struct comedi_file *cfp = file->private_data; |
2260 | struct comedi_device *dev = cfp->dev; | |
ca081b1d | 2261 | struct comedi_subdevice *s; |
3ffab428 | 2262 | |
ed9eccbe | 2263 | mutex_lock(&dev->mutex); |
ca081b1d | 2264 | |
ed9eccbe | 2265 | if (!dev->attached) { |
272850f0 | 2266 | dev_dbg(dev->class_dev, "no driver attached\n"); |
ca081b1d | 2267 | goto done; |
ed9eccbe DS |
2268 | } |
2269 | ||
20f083c0 | 2270 | s = comedi_file_read_subdevice(file); |
cc400e18 | 2271 | if (s && s->async) { |
ca081b1d | 2272 | poll_wait(file, &s->async->wait_head, wait); |
f0124630 | 2273 | if (!s->busy || !comedi_is_subdevice_running(s) || |
662c722b | 2274 | (s->async->cmd.flags & CMDF_WRITE) || |
e9edef3a | 2275 | comedi_buf_read_n_available(s) > 0) |
ed9eccbe | 2276 | mask |= POLLIN | POLLRDNORM; |
ed9eccbe | 2277 | } |
ca081b1d | 2278 | |
20f083c0 | 2279 | s = comedi_file_write_subdevice(file); |
cc400e18 | 2280 | if (s && s->async) { |
c39e050d | 2281 | unsigned int bps = comedi_bytes_per_sample(s); |
ca081b1d HS |
2282 | |
2283 | poll_wait(file, &s->async->wait_head, wait); | |
24e894bb | 2284 | comedi_buf_write_alloc(s, s->async->prealloc_bufsz); |
f0124630 | 2285 | if (!s->busy || !comedi_is_subdevice_running(s) || |
662c722b | 2286 | !(s->async->cmd.flags & CMDF_WRITE) || |
0f1f34e8 | 2287 | comedi_buf_write_n_allocated(s) >= bps) |
ed9eccbe | 2288 | mask |= POLLOUT | POLLWRNORM; |
ed9eccbe DS |
2289 | } |
2290 | ||
ca081b1d | 2291 | done: |
ed9eccbe DS |
2292 | mutex_unlock(&dev->mutex); |
2293 | return mask; | |
2294 | } | |
2295 | ||
92d0127c GKH |
2296 | static ssize_t comedi_write(struct file *file, const char __user *buf, |
2297 | size_t nbytes, loff_t *offset) | |
ed9eccbe | 2298 | { |
34c43922 | 2299 | struct comedi_subdevice *s; |
d163679c | 2300 | struct comedi_async *async; |
ed9eccbe DS |
2301 | int n, m, count = 0, retval = 0; |
2302 | DECLARE_WAITQUEUE(wait, current); | |
20f083c0 IA |
2303 | struct comedi_file *cfp = file->private_data; |
2304 | struct comedi_device *dev = cfp->dev; | |
9329f139 IA |
2305 | bool on_wait_queue = false; |
2306 | bool attach_locked; | |
2307 | unsigned int old_detach_count; | |
3ffab428 | 2308 | |
9329f139 IA |
2309 | /* Protect against device detachment during operation. */ |
2310 | down_read(&dev->attach_lock); | |
2311 | attach_locked = true; | |
2312 | old_detach_count = dev->detach_count; | |
2313 | ||
ed9eccbe | 2314 | if (!dev->attached) { |
272850f0 | 2315 | dev_dbg(dev->class_dev, "no driver attached\n"); |
9329f139 IA |
2316 | retval = -ENODEV; |
2317 | goto out; | |
ed9eccbe DS |
2318 | } |
2319 | ||
20f083c0 | 2320 | s = comedi_file_write_subdevice(file); |
9329f139 IA |
2321 | if (!s || !s->async) { |
2322 | retval = -EIO; | |
2323 | goto out; | |
2324 | } | |
2714b019 | 2325 | |
ed9eccbe DS |
2326 | async = s->async; |
2327 | ||
2714b019 | 2328 | if (!s->busy || !nbytes) |
9329f139 IA |
2329 | goto out; |
2330 | if (s->busy != file) { | |
2331 | retval = -EACCES; | |
2332 | goto out; | |
2333 | } | |
f7398509 IA |
2334 | if (!(async->cmd.flags & CMDF_WRITE)) { |
2335 | retval = -EINVAL; | |
2336 | goto out; | |
2337 | } | |
2714b019 | 2338 | |
ed9eccbe | 2339 | add_wait_queue(&async->wait_head, &wait); |
9329f139 | 2340 | on_wait_queue = true; |
ed9eccbe | 2341 | while (nbytes > 0 && !retval) { |
b183a836 IA |
2342 | unsigned runflags; |
2343 | ||
ed9eccbe DS |
2344 | set_current_state(TASK_INTERRUPTIBLE); |
2345 | ||
b183a836 IA |
2346 | runflags = comedi_get_subdevice_runflags(s); |
2347 | if (!comedi_is_runflags_running(runflags)) { | |
d2611540 | 2348 | if (count == 0) { |
9329f139 IA |
2349 | struct comedi_subdevice *new_s; |
2350 | ||
b183a836 | 2351 | if (comedi_is_runflags_in_error(runflags)) |
d2611540 | 2352 | retval = -EPIPE; |
c098c21a | 2353 | else |
d2611540 | 2354 | retval = 0; |
9329f139 IA |
2355 | /* |
2356 | * To avoid deadlock, cannot acquire dev->mutex | |
2357 | * while dev->attach_lock is held. Need to | |
2358 | * remove task from the async wait queue before | |
2359 | * releasing dev->attach_lock, as it might not | |
2360 | * be valid afterwards. | |
2361 | */ | |
2362 | remove_wait_queue(&async->wait_head, &wait); | |
2363 | on_wait_queue = false; | |
2364 | up_read(&dev->attach_lock); | |
2365 | attach_locked = false; | |
2366 | mutex_lock(&dev->mutex); | |
2367 | /* | |
2368 | * Become non-busy unless things have changed | |
2369 | * behind our back. Checking dev->detach_count | |
2370 | * is unchanged ought to be sufficient (unless | |
2371 | * there have been 2**32 detaches in the | |
2372 | * meantime!), but check the subdevice pointer | |
2373 | * as well just in case. | |
2374 | */ | |
20f083c0 | 2375 | new_s = comedi_file_write_subdevice(file); |
9329f139 IA |
2376 | if (dev->attached && |
2377 | old_detach_count == dev->detach_count && | |
2378 | s == new_s && new_s->async == async) | |
2379 | do_become_nonbusy(dev, s); | |
4b18f08b | 2380 | mutex_unlock(&dev->mutex); |
d2611540 IA |
2381 | } |
2382 | break; | |
2383 | } | |
2384 | ||
ed9eccbe DS |
2385 | n = nbytes; |
2386 | ||
2387 | m = n; | |
476b8477 | 2388 | if (async->buf_write_ptr + m > async->prealloc_bufsz) |
ed9eccbe | 2389 | m = async->prealloc_bufsz - async->buf_write_ptr; |
24e894bb | 2390 | comedi_buf_write_alloc(s, async->prealloc_bufsz); |
0f1f34e8 IA |
2391 | if (m > comedi_buf_write_n_allocated(s)) |
2392 | m = comedi_buf_write_n_allocated(s); | |
ed9eccbe DS |
2393 | if (m < n) |
2394 | n = m; | |
2395 | ||
2396 | if (n == 0) { | |
ed9eccbe DS |
2397 | if (file->f_flags & O_NONBLOCK) { |
2398 | retval = -EAGAIN; | |
2399 | break; | |
2400 | } | |
6a9ce6b6 | 2401 | schedule(); |
ed9eccbe DS |
2402 | if (signal_pending(current)) { |
2403 | retval = -ERESTARTSYS; | |
2404 | break; | |
2405 | } | |
476b8477 | 2406 | if (!s->busy) |
ed9eccbe | 2407 | break; |
ed9eccbe DS |
2408 | if (s->busy != file) { |
2409 | retval = -EACCES; | |
2410 | break; | |
2411 | } | |
f7398509 IA |
2412 | if (!(async->cmd.flags & CMDF_WRITE)) { |
2413 | retval = -EINVAL; | |
2414 | break; | |
2415 | } | |
ed9eccbe DS |
2416 | continue; |
2417 | } | |
2418 | ||
2419 | m = copy_from_user(async->prealloc_buf + async->buf_write_ptr, | |
476b8477 | 2420 | buf, n); |
ed9eccbe DS |
2421 | if (m) { |
2422 | n -= m; | |
2423 | retval = -EFAULT; | |
2424 | } | |
940dd35d | 2425 | comedi_buf_write_free(s, n); |
ed9eccbe DS |
2426 | |
2427 | count += n; | |
2428 | nbytes -= n; | |
2429 | ||
2430 | buf += n; | |
2431 | break; /* makes device work like a pipe */ | |
2432 | } | |
9329f139 IA |
2433 | out: |
2434 | if (on_wait_queue) | |
2435 | remove_wait_queue(&async->wait_head, &wait); | |
ed9eccbe | 2436 | set_current_state(TASK_RUNNING); |
9329f139 IA |
2437 | if (attach_locked) |
2438 | up_read(&dev->attach_lock); | |
ed9eccbe | 2439 | |
476b8477 | 2440 | return count ? count : retval; |
ed9eccbe DS |
2441 | } |
2442 | ||
92d0127c | 2443 | static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes, |
36efbacd | 2444 | loff_t *offset) |
ed9eccbe | 2445 | { |
34c43922 | 2446 | struct comedi_subdevice *s; |
d163679c | 2447 | struct comedi_async *async; |
ed9eccbe DS |
2448 | int n, m, count = 0, retval = 0; |
2449 | DECLARE_WAITQUEUE(wait, current); | |
20f083c0 IA |
2450 | struct comedi_file *cfp = file->private_data; |
2451 | struct comedi_device *dev = cfp->dev; | |
45c2bc55 IA |
2452 | unsigned int old_detach_count; |
2453 | bool become_nonbusy = false; | |
2454 | bool attach_locked; | |
3ffab428 | 2455 | |
45c2bc55 IA |
2456 | /* Protect against device detachment during operation. */ |
2457 | down_read(&dev->attach_lock); | |
2458 | attach_locked = true; | |
2459 | old_detach_count = dev->detach_count; | |
2460 | ||
ed9eccbe | 2461 | if (!dev->attached) { |
272850f0 | 2462 | dev_dbg(dev->class_dev, "no driver attached\n"); |
45c2bc55 IA |
2463 | retval = -ENODEV; |
2464 | goto out; | |
ed9eccbe DS |
2465 | } |
2466 | ||
20f083c0 | 2467 | s = comedi_file_read_subdevice(file); |
45c2bc55 IA |
2468 | if (!s || !s->async) { |
2469 | retval = -EIO; | |
2470 | goto out; | |
2471 | } | |
5c87fef5 | 2472 | |
ed9eccbe | 2473 | async = s->async; |
5c87fef5 | 2474 | if (!s->busy || !nbytes) |
45c2bc55 IA |
2475 | goto out; |
2476 | if (s->busy != file) { | |
2477 | retval = -EACCES; | |
2478 | goto out; | |
2479 | } | |
f025ab9e IA |
2480 | if (async->cmd.flags & CMDF_WRITE) { |
2481 | retval = -EINVAL; | |
2482 | goto out; | |
2483 | } | |
ed9eccbe DS |
2484 | |
2485 | add_wait_queue(&async->wait_head, &wait); | |
2486 | while (nbytes > 0 && !retval) { | |
2487 | set_current_state(TASK_INTERRUPTIBLE); | |
2488 | ||
2489 | n = nbytes; | |
2490 | ||
e9edef3a | 2491 | m = comedi_buf_read_n_available(s); |
476b8477 | 2492 | if (async->buf_read_ptr + m > async->prealloc_bufsz) |
ed9eccbe | 2493 | m = async->prealloc_bufsz - async->buf_read_ptr; |
ed9eccbe DS |
2494 | if (m < n) |
2495 | n = m; | |
2496 | ||
2497 | if (n == 0) { | |
b183a836 IA |
2498 | unsigned runflags = comedi_get_subdevice_runflags(s); |
2499 | ||
2500 | if (!comedi_is_runflags_running(runflags)) { | |
2501 | if (comedi_is_runflags_in_error(runflags)) | |
ed9eccbe | 2502 | retval = -EPIPE; |
c098c21a | 2503 | else |
ed9eccbe | 2504 | retval = 0; |
45c2bc55 | 2505 | become_nonbusy = true; |
ed9eccbe DS |
2506 | break; |
2507 | } | |
2508 | if (file->f_flags & O_NONBLOCK) { | |
2509 | retval = -EAGAIN; | |
2510 | break; | |
2511 | } | |
6a9ce6b6 | 2512 | schedule(); |
ed9eccbe DS |
2513 | if (signal_pending(current)) { |
2514 | retval = -ERESTARTSYS; | |
2515 | break; | |
2516 | } | |
ed9eccbe DS |
2517 | if (!s->busy) { |
2518 | retval = 0; | |
2519 | break; | |
2520 | } | |
2521 | if (s->busy != file) { | |
2522 | retval = -EACCES; | |
2523 | break; | |
2524 | } | |
f025ab9e IA |
2525 | if (async->cmd.flags & CMDF_WRITE) { |
2526 | retval = -EINVAL; | |
2527 | break; | |
2528 | } | |
ed9eccbe DS |
2529 | continue; |
2530 | } | |
2531 | m = copy_to_user(buf, async->prealloc_buf + | |
476b8477 | 2532 | async->buf_read_ptr, n); |
ed9eccbe DS |
2533 | if (m) { |
2534 | n -= m; | |
2535 | retval = -EFAULT; | |
2536 | } | |
2537 | ||
d13be55a | 2538 | comedi_buf_read_alloc(s, n); |
f1df8662 | 2539 | comedi_buf_read_free(s, n); |
ed9eccbe DS |
2540 | |
2541 | count += n; | |
2542 | nbytes -= n; | |
2543 | ||
2544 | buf += n; | |
2545 | break; /* makes device work like a pipe */ | |
2546 | } | |
45c2bc55 IA |
2547 | remove_wait_queue(&async->wait_head, &wait); |
2548 | set_current_state(TASK_RUNNING); | |
2549 | if (become_nonbusy || comedi_is_subdevice_idle(s)) { | |
2550 | struct comedi_subdevice *new_s; | |
2551 | ||
2552 | /* | |
2553 | * To avoid deadlock, cannot acquire dev->mutex | |
2554 | * while dev->attach_lock is held. | |
2555 | */ | |
2556 | up_read(&dev->attach_lock); | |
2557 | attach_locked = false; | |
4b18f08b | 2558 | mutex_lock(&dev->mutex); |
45c2bc55 IA |
2559 | /* |
2560 | * Check device hasn't become detached behind our back. | |
2561 | * Checking dev->detach_count is unchanged ought to be | |
2562 | * sufficient (unless there have been 2**32 detaches in the | |
2563 | * meantime!), but check the subdevice pointer as well just in | |
2564 | * case. | |
2565 | */ | |
20f083c0 | 2566 | new_s = comedi_file_read_subdevice(file); |
45c2bc55 IA |
2567 | if (dev->attached && old_detach_count == dev->detach_count && |
2568 | s == new_s && new_s->async == async) { | |
f4f3f7cf | 2569 | if (become_nonbusy || comedi_buf_n_bytes_ready(s) == 0) |
45c2bc55 IA |
2570 | do_become_nonbusy(dev, s); |
2571 | } | |
4b18f08b | 2572 | mutex_unlock(&dev->mutex); |
ed9eccbe | 2573 | } |
45c2bc55 IA |
2574 | out: |
2575 | if (attach_locked) | |
2576 | up_read(&dev->attach_lock); | |
ed9eccbe | 2577 | |
476b8477 | 2578 | return count ? count : retval; |
ed9eccbe DS |
2579 | } |
2580 | ||
ed9eccbe DS |
2581 | static int comedi_open(struct inode *inode, struct file *file) |
2582 | { | |
ed9eccbe | 2583 | const unsigned minor = iminor(inode); |
20f083c0 | 2584 | struct comedi_file *cfp; |
fc406986 IA |
2585 | struct comedi_device *dev = comedi_dev_get_from_minor(minor); |
2586 | int rc; | |
97920071 | 2587 | |
4da5fa9a | 2588 | if (!dev) { |
272850f0 | 2589 | pr_debug("invalid minor number\n"); |
ed9eccbe DS |
2590 | return -ENODEV; |
2591 | } | |
2592 | ||
20f083c0 IA |
2593 | cfp = kzalloc(sizeof(*cfp), GFP_KERNEL); |
2594 | if (!cfp) | |
2595 | return -ENOMEM; | |
2596 | ||
2597 | cfp->dev = dev; | |
2598 | ||
ed9eccbe | 2599 | mutex_lock(&dev->mutex); |
0e0d311e IA |
2600 | if (!dev->attached && !capable(CAP_SYS_ADMIN)) { |
2601 | dev_dbg(dev->class_dev, "not attached and not CAP_SYS_ADMIN\n"); | |
fc406986 IA |
2602 | rc = -ENODEV; |
2603 | goto out; | |
ed9eccbe | 2604 | } |
1363e4fb | 2605 | if (dev->attached && dev->use_count == 0) { |
ed9eccbe | 2606 | if (!try_module_get(dev->driver->module)) { |
90e6f51d | 2607 | rc = -ENXIO; |
fc406986 | 2608 | goto out; |
ed9eccbe | 2609 | } |
1363e4fb IA |
2610 | if (dev->open) { |
2611 | rc = dev->open(dev); | |
2612 | if (rc < 0) { | |
2613 | module_put(dev->driver->module); | |
2614 | goto out; | |
2615 | } | |
3c17ba07 IA |
2616 | } |
2617 | } | |
ed9eccbe DS |
2618 | |
2619 | dev->use_count++; | |
20f083c0 IA |
2620 | file->private_data = cfp; |
2621 | comedi_file_reset(file); | |
fc406986 | 2622 | rc = 0; |
ed9eccbe | 2623 | |
fc406986 | 2624 | out: |
a5011a26 | 2625 | mutex_unlock(&dev->mutex); |
20f083c0 | 2626 | if (rc) { |
fc406986 | 2627 | comedi_dev_put(dev); |
20f083c0 IA |
2628 | kfree(cfp); |
2629 | } | |
fc406986 | 2630 | return rc; |
ed9eccbe DS |
2631 | } |
2632 | ||
2aae0076 HS |
2633 | static int comedi_fasync(int fd, struct file *file, int on) |
2634 | { | |
20f083c0 IA |
2635 | struct comedi_file *cfp = file->private_data; |
2636 | struct comedi_device *dev = cfp->dev; | |
2aae0076 HS |
2637 | |
2638 | return fasync_helper(fd, file, on, &dev->async_queue); | |
2639 | } | |
2640 | ||
a5011a26 | 2641 | static int comedi_close(struct inode *inode, struct file *file) |
ed9eccbe | 2642 | { |
20f083c0 IA |
2643 | struct comedi_file *cfp = file->private_data; |
2644 | struct comedi_device *dev = cfp->dev; | |
a5011a26 | 2645 | struct comedi_subdevice *s = NULL; |
ed9eccbe DS |
2646 | int i; |
2647 | ||
a5011a26 HS |
2648 | mutex_lock(&dev->mutex); |
2649 | ||
2650 | if (dev->subdevices) { | |
2651 | for (i = 0; i < dev->n_subdevices; i++) { | |
b077f2cd | 2652 | s = &dev->subdevices[i]; |
a5011a26 HS |
2653 | |
2654 | if (s->busy == file) | |
2655 | do_cancel(dev, s); | |
2656 | if (s->lock == file) | |
2657 | s->lock = NULL; | |
2658 | } | |
ed9eccbe | 2659 | } |
1363e4fb IA |
2660 | if (dev->attached && dev->use_count == 1) { |
2661 | if (dev->close) | |
2662 | dev->close(dev); | |
a5011a26 | 2663 | module_put(dev->driver->module); |
1363e4fb | 2664 | } |
a5011a26 HS |
2665 | |
2666 | dev->use_count--; | |
2667 | ||
2668 | mutex_unlock(&dev->mutex); | |
fc406986 | 2669 | comedi_dev_put(dev); |
20f083c0 | 2670 | kfree(cfp); |
a5011a26 | 2671 | |
ed9eccbe DS |
2672 | return 0; |
2673 | } | |
2674 | ||
8cb8aad7 | 2675 | static const struct file_operations comedi_fops = { |
a5011a26 HS |
2676 | .owner = THIS_MODULE, |
2677 | .unlocked_ioctl = comedi_unlocked_ioctl, | |
2678 | .compat_ioctl = comedi_compat_ioctl, | |
2679 | .open = comedi_open, | |
2680 | .release = comedi_close, | |
2681 | .read = comedi_read, | |
2682 | .write = comedi_write, | |
2683 | .mmap = comedi_mmap, | |
2684 | .poll = comedi_poll, | |
2685 | .fasync = comedi_fasync, | |
2686 | .llseek = noop_llseek, | |
2687 | }; | |
2688 | ||
dd630cde IA |
2689 | /** |
2690 | * comedi_event - handle events for asynchronous comedi command | |
2691 | * @dev: comedi_device struct | |
2692 | * @s: comedi_subdevice struct associated with dev | |
2693 | * Context: interrupt (usually), s->spin_lock spin-lock not held | |
2694 | * | |
2695 | * If an asynchronous comedi command is active on the subdevice, process | |
2696 | * any COMEDI_CB_... event flags that have been set, usually by an | |
2697 | * interrupt handler. These may change the run state of the asynchronous | |
2698 | * command, wake a task, and/or send a SIGIO signal. | |
2699 | */ | |
a5011a26 | 2700 | void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s) |
883db3d9 | 2701 | { |
a5011a26 | 2702 | struct comedi_async *async = s->async; |
ef4b4b27 IA |
2703 | unsigned int events; |
2704 | int si_code = 0; | |
2705 | unsigned long flags; | |
2706 | ||
2707 | spin_lock_irqsave(&s->spin_lock, flags); | |
883db3d9 | 2708 | |
ef4b4b27 | 2709 | events = async->events; |
922d9ced | 2710 | async->events = 0; |
ef4b4b27 IA |
2711 | if (!__comedi_is_subdevice_running(s)) { |
2712 | spin_unlock_irqrestore(&s->spin_lock, flags); | |
a5011a26 | 2713 | return; |
ef4b4b27 | 2714 | } |
a5011a26 | 2715 | |
922d9ced | 2716 | if (events & COMEDI_CB_CANCEL_MASK) |
ef4b4b27 | 2717 | __comedi_clear_subdevice_runflags(s, COMEDI_SRF_RUNNING); |
781f933c HS |
2718 | |
2719 | /* | |
ef4b4b27 IA |
2720 | * Remember if an error event has occurred, so an error can be |
2721 | * returned the next time the user does a read() or write(). | |
781f933c | 2722 | */ |
ef4b4b27 IA |
2723 | if (events & COMEDI_CB_ERROR_MASK) |
2724 | __comedi_set_subdevice_runflags(s, COMEDI_SRF_ERROR); | |
883db3d9 | 2725 | |
922d9ced | 2726 | if (async->cb_mask & events) { |
c265be01 | 2727 | wake_up_interruptible(&async->wait_head); |
aa33122f | 2728 | si_code = async->cmd.flags & CMDF_WRITE ? POLL_OUT : POLL_IN; |
a5011a26 | 2729 | } |
ef4b4b27 IA |
2730 | |
2731 | spin_unlock_irqrestore(&s->spin_lock, flags); | |
2732 | ||
2733 | if (si_code) | |
2734 | kill_fasync(&dev->async_queue, SIGIO, si_code); | |
883db3d9 | 2735 | } |
5660e742 | 2736 | EXPORT_SYMBOL_GPL(comedi_event); |
883db3d9 | 2737 | |
07778393 | 2738 | /* Note: the ->mutex is pre-locked on successful return */ |
7638ffcb | 2739 | struct comedi_device *comedi_alloc_board_minor(struct device *hardware_device) |
a5011a26 | 2740 | { |
7638ffcb | 2741 | struct comedi_device *dev; |
a5011a26 HS |
2742 | struct device *csdev; |
2743 | unsigned i; | |
a5011a26 | 2744 | |
36efbacd | 2745 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
88cc30cf | 2746 | if (!dev) |
7638ffcb | 2747 | return ERR_PTR(-ENOMEM); |
7638ffcb | 2748 | comedi_device_init(dev); |
db2e3487 | 2749 | comedi_set_hw_dev(dev, hardware_device); |
07778393 | 2750 | mutex_lock(&dev->mutex); |
5b7dba1b | 2751 | mutex_lock(&comedi_board_minor_table_lock); |
38b9722a IA |
2752 | for (i = hardware_device ? comedi_num_legacy_minors : 0; |
2753 | i < COMEDI_NUM_BOARD_MINORS; ++i) { | |
88cc30cf | 2754 | if (!comedi_board_minor_table[i]) { |
cb6b79de | 2755 | comedi_board_minor_table[i] = dev; |
a5011a26 HS |
2756 | break; |
2757 | } | |
2758 | } | |
5b7dba1b | 2759 | mutex_unlock(&comedi_board_minor_table_lock); |
a5011a26 | 2760 | if (i == COMEDI_NUM_BOARD_MINORS) { |
07778393 | 2761 | mutex_unlock(&dev->mutex); |
7638ffcb | 2762 | comedi_device_cleanup(dev); |
5b13ed94 | 2763 | comedi_dev_put(dev); |
a112eab4 HM |
2764 | dev_err(hardware_device, |
2765 | "ran out of minor numbers for board device files\n"); | |
7638ffcb | 2766 | return ERR_PTR(-EBUSY); |
a5011a26 | 2767 | } |
7638ffcb | 2768 | dev->minor = i; |
a5011a26 HS |
2769 | csdev = device_create(comedi_class, hardware_device, |
2770 | MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i", i); | |
2771 | if (!IS_ERR(csdev)) | |
8f988d87 | 2772 | dev->class_dev = get_device(csdev); |
883db3d9 | 2773 | |
07778393 | 2774 | /* Note: dev->mutex needs to be unlocked by the caller. */ |
7638ffcb | 2775 | return dev; |
883db3d9 FMH |
2776 | } |
2777 | ||
70f30c37 | 2778 | static void comedi_free_board_minor(unsigned minor) |
24fb134d IA |
2779 | { |
2780 | BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS); | |
cb6b79de | 2781 | comedi_free_board_dev(comedi_clear_board_minor(minor)); |
24fb134d IA |
2782 | } |
2783 | ||
3346b798 | 2784 | void comedi_release_hardware_device(struct device *hardware_device) |
883db3d9 | 2785 | { |
a5011a26 | 2786 | int minor; |
cb6b79de | 2787 | struct comedi_device *dev; |
883db3d9 | 2788 | |
38b9722a IA |
2789 | for (minor = comedi_num_legacy_minors; minor < COMEDI_NUM_BOARD_MINORS; |
2790 | minor++) { | |
5b7dba1b | 2791 | mutex_lock(&comedi_board_minor_table_lock); |
cb6b79de IA |
2792 | dev = comedi_board_minor_table[minor]; |
2793 | if (dev && dev->hw_dev == hardware_device) { | |
5b7dba1b IA |
2794 | comedi_board_minor_table[minor] = NULL; |
2795 | mutex_unlock(&comedi_board_minor_table_lock); | |
cb6b79de | 2796 | comedi_free_board_dev(dev); |
3346b798 | 2797 | break; |
a5011a26 | 2798 | } |
5b7dba1b | 2799 | mutex_unlock(&comedi_board_minor_table_lock); |
883db3d9 | 2800 | } |
883db3d9 FMH |
2801 | } |
2802 | ||
f65cc544 | 2803 | int comedi_alloc_subdevice_minor(struct comedi_subdevice *s) |
883db3d9 | 2804 | { |
f65cc544 | 2805 | struct comedi_device *dev = s->device; |
a5011a26 HS |
2806 | struct device *csdev; |
2807 | unsigned i; | |
883db3d9 | 2808 | |
5b7dba1b IA |
2809 | mutex_lock(&comedi_subdevice_minor_table_lock); |
2810 | for (i = 0; i < COMEDI_NUM_SUBDEVICE_MINORS; ++i) { | |
88cc30cf | 2811 | if (!comedi_subdevice_minor_table[i]) { |
bd5b4173 | 2812 | comedi_subdevice_minor_table[i] = s; |
a5011a26 HS |
2813 | break; |
2814 | } | |
2815 | } | |
5b7dba1b IA |
2816 | mutex_unlock(&comedi_subdevice_minor_table_lock); |
2817 | if (i == COMEDI_NUM_SUBDEVICE_MINORS) { | |
a112eab4 HM |
2818 | dev_err(dev->class_dev, |
2819 | "ran out of minor numbers for subdevice files\n"); | |
a5011a26 HS |
2820 | return -EBUSY; |
2821 | } | |
5b7dba1b | 2822 | i += COMEDI_NUM_BOARD_MINORS; |
a5011a26 HS |
2823 | s->minor = i; |
2824 | csdev = device_create(comedi_class, dev->class_dev, | |
2825 | MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i_subd%i", | |
90a35c15 | 2826 | dev->minor, s->index); |
a5011a26 HS |
2827 | if (!IS_ERR(csdev)) |
2828 | s->class_dev = csdev; | |
883db3d9 | 2829 | |
da718546 | 2830 | return 0; |
883db3d9 FMH |
2831 | } |
2832 | ||
a5011a26 | 2833 | void comedi_free_subdevice_minor(struct comedi_subdevice *s) |
883db3d9 | 2834 | { |
0fcc9d48 | 2835 | unsigned int i; |
883db3d9 | 2836 | |
88cc30cf | 2837 | if (!s) |
a5011a26 | 2838 | return; |
5104a898 HS |
2839 | if (s->minor < COMEDI_NUM_BOARD_MINORS || |
2840 | s->minor >= COMEDI_NUM_MINORS) | |
a5011a26 | 2841 | return; |
883db3d9 | 2842 | |
0fcc9d48 IA |
2843 | i = s->minor - COMEDI_NUM_BOARD_MINORS; |
2844 | mutex_lock(&comedi_subdevice_minor_table_lock); | |
bd5b4173 IA |
2845 | if (s == comedi_subdevice_minor_table[i]) |
2846 | comedi_subdevice_minor_table[i] = NULL; | |
0fcc9d48 | 2847 | mutex_unlock(&comedi_subdevice_minor_table_lock); |
a5011a26 HS |
2848 | if (s->class_dev) { |
2849 | device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor)); | |
2850 | s->class_dev = NULL; | |
883db3d9 | 2851 | } |
883db3d9 | 2852 | } |
a5787824 | 2853 | |
682b9119 | 2854 | static void comedi_cleanup_board_minors(void) |
76cca89f HS |
2855 | { |
2856 | unsigned i; | |
2857 | ||
682b9119 | 2858 | for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) |
76cca89f HS |
2859 | comedi_free_board_minor(i); |
2860 | } | |
2861 | ||
91fa0b0c HS |
2862 | static int __init comedi_init(void) |
2863 | { | |
2864 | int i; | |
2865 | int retval; | |
2866 | ||
c2ad078b | 2867 | pr_info("version " COMEDI_RELEASE " - http://www.comedi.org\n"); |
91fa0b0c HS |
2868 | |
2869 | if (comedi_num_legacy_minors < 0 || | |
2870 | comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) { | |
c2ad078b | 2871 | pr_err("invalid value for module parameter \"comedi_num_legacy_minors\". Valid values are 0 through %i.\n", |
91fa0b0c HS |
2872 | COMEDI_NUM_BOARD_MINORS); |
2873 | return -EINVAL; | |
2874 | } | |
2875 | ||
91fa0b0c HS |
2876 | retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0), |
2877 | COMEDI_NUM_MINORS, "comedi"); | |
2878 | if (retval) | |
2879 | return -EIO; | |
2880 | cdev_init(&comedi_cdev, &comedi_fops); | |
2881 | comedi_cdev.owner = THIS_MODULE; | |
a5bde3a1 AP |
2882 | |
2883 | retval = kobject_set_name(&comedi_cdev.kobj, "comedi"); | |
2884 | if (retval) { | |
2885 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
2886 | COMEDI_NUM_MINORS); | |
2887 | return retval; | |
2888 | } | |
2889 | ||
91fa0b0c HS |
2890 | if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) { |
2891 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
2892 | COMEDI_NUM_MINORS); | |
2893 | return -EIO; | |
2894 | } | |
2895 | comedi_class = class_create(THIS_MODULE, "comedi"); | |
2896 | if (IS_ERR(comedi_class)) { | |
c2ad078b | 2897 | pr_err("failed to create class\n"); |
91fa0b0c HS |
2898 | cdev_del(&comedi_cdev); |
2899 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
2900 | COMEDI_NUM_MINORS); | |
2901 | return PTR_ERR(comedi_class); | |
2902 | } | |
2903 | ||
e56341ad | 2904 | comedi_class->dev_groups = comedi_dev_groups; |
91fa0b0c HS |
2905 | |
2906 | /* XXX requires /proc interface */ | |
2907 | comedi_proc_init(); | |
2908 | ||
2909 | /* create devices files for legacy/manual use */ | |
2910 | for (i = 0; i < comedi_num_legacy_minors; i++) { | |
7638ffcb | 2911 | struct comedi_device *dev; |
4bac39f6 | 2912 | |
7638ffcb IA |
2913 | dev = comedi_alloc_board_minor(NULL); |
2914 | if (IS_ERR(dev)) { | |
682b9119 | 2915 | comedi_cleanup_board_minors(); |
91fa0b0c HS |
2916 | cdev_del(&comedi_cdev); |
2917 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
2918 | COMEDI_NUM_MINORS); | |
7638ffcb | 2919 | return PTR_ERR(dev); |
91fa0b0c | 2920 | } |
cb3aadae KH |
2921 | /* comedi_alloc_board_minor() locked the mutex */ |
2922 | mutex_unlock(&dev->mutex); | |
91fa0b0c HS |
2923 | } |
2924 | ||
2925 | return 0; | |
2926 | } | |
2927 | module_init(comedi_init); | |
2928 | ||
2929 | static void __exit comedi_cleanup(void) | |
2930 | { | |
682b9119 | 2931 | comedi_cleanup_board_minors(); |
91fa0b0c HS |
2932 | class_destroy(comedi_class); |
2933 | cdev_del(&comedi_cdev); | |
2934 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS); | |
2935 | ||
2936 | comedi_proc_cleanup(); | |
2937 | } | |
2938 | module_exit(comedi_cleanup); | |
2939 | ||
a5787824 HS |
2940 | MODULE_AUTHOR("http://www.comedi.org"); |
2941 | MODULE_DESCRIPTION("Comedi core module"); | |
2942 | MODULE_LICENSE("GPL"); |