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Commit | Line | Data |
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ed9eccbe | 1 | /* |
f6fef5df IA |
2 | * comedi/comedi_fops.c |
3 | * comedi kernel module | |
4 | * | |
5 | * COMEDI - Linux Control and Measurement Device Interface | |
6 | * Copyright (C) 1997-2000 David A. Schleef <ds@schleef.org> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | */ | |
ed9eccbe | 18 | |
c2ad078b HS |
19 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
20 | ||
ed9eccbe DS |
21 | #include "comedi_compat32.h" |
22 | ||
23 | #include <linux/module.h> | |
24 | #include <linux/errno.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/sched.h> | |
27 | #include <linux/fcntl.h> | |
28 | #include <linux/delay.h> | |
ed9eccbe DS |
29 | #include <linux/mm.h> |
30 | #include <linux/slab.h> | |
31 | #include <linux/kmod.h> | |
32 | #include <linux/poll.h> | |
33 | #include <linux/init.h> | |
34 | #include <linux/device.h> | |
35 | #include <linux/vmalloc.h> | |
36 | #include <linux/fs.h> | |
37 | #include "comedidev.h" | |
38 | #include <linux/cdev.h> | |
883db3d9 | 39 | #include <linux/stat.h> |
ed9eccbe | 40 | |
476b8477 GKH |
41 | #include <linux/io.h> |
42 | #include <linux/uaccess.h> | |
ed9eccbe | 43 | |
3a5fa275 | 44 | #include "comedi_internal.h" |
ed9eccbe | 45 | |
63107ce8 | 46 | /* |
eb340aca | 47 | * comedi_subdevice "runflags" |
63107ce8 IA |
48 | * COMEDI_SRF_RT: DEPRECATED: command is running real-time |
49 | * COMEDI_SRF_ERROR: indicates an COMEDI_CB_ERROR event has occurred | |
eb340aca | 50 | * since the last command was started |
63107ce8 IA |
51 | * COMEDI_SRF_RUNNING: command is running |
52 | * COMEDI_SRF_FREE_SPRIV: free s->private on detach | |
eb340aca | 53 | * |
63107ce8 | 54 | * COMEDI_SRF_BUSY_MASK: runflags that indicate the subdevice is "busy" |
eb340aca IA |
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 | 63 | /** |
a3e39942 IA |
64 | * struct comedi_file - Per-file private data for COMEDI device |
65 | * @dev: COMEDI device. | |
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. | |
20f083c0 IA |
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 | 133 | /** |
a3e39942 IA |
134 | * comedi_dev_put() - Release a use of a COMEDI device |
135 | * @dev: COMEDI device. | |
dd630cde | 136 | * |
a3e39942 IA |
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. | |
dd630cde | 140 | * |
a3e39942 IA |
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 | |
dd630cde IA |
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 | ||
b449c1ca IA |
230 | mutex_lock(&comedi_board_minor_table_lock); |
231 | dev = comedi_dev_get(comedi_board_minor_table[minor]); | |
232 | mutex_unlock(&comedi_board_minor_table_lock); | |
233 | return dev; | |
234 | } | |
235 | ||
236 | static struct comedi_device *comedi_dev_get_from_subdevice_minor(unsigned minor) | |
237 | { | |
238 | struct comedi_device *dev; | |
239 | struct comedi_subdevice *s; | |
240 | unsigned int i = minor - COMEDI_NUM_BOARD_MINORS; | |
241 | ||
b449c1ca IA |
242 | mutex_lock(&comedi_subdevice_minor_table_lock); |
243 | s = comedi_subdevice_minor_table[i]; | |
244 | dev = comedi_dev_get(s ? s->device : NULL); | |
245 | mutex_unlock(&comedi_subdevice_minor_table_lock); | |
246 | return dev; | |
247 | } | |
248 | ||
dd630cde | 249 | /** |
a3e39942 IA |
250 | * comedi_dev_get_from_minor() - Get COMEDI device by minor device number |
251 | * @minor: Minor device number. | |
dd630cde | 252 | * |
a3e39942 IA |
253 | * Finds the COMEDI device associated with the minor device number, if any, |
254 | * and increments its reference count. The COMEDI device is prevented from | |
dd630cde IA |
255 | * being freed until a matching call is made to comedi_dev_put(). |
256 | * | |
a3e39942 IA |
257 | * Return: A pointer to the COMEDI device if it exists, with its usage |
258 | * reference incremented. Return NULL if no COMEDI device exists with the | |
dd630cde IA |
259 | * specified minor device number. |
260 | */ | |
b449c1ca IA |
261 | struct comedi_device *comedi_dev_get_from_minor(unsigned minor) |
262 | { | |
263 | if (minor < COMEDI_NUM_BOARD_MINORS) | |
264 | return comedi_dev_get_from_board_minor(minor); | |
cb3aadae KH |
265 | |
266 | return comedi_dev_get_from_subdevice_minor(minor); | |
b449c1ca IA |
267 | } |
268 | EXPORT_SYMBOL_GPL(comedi_dev_get_from_minor); | |
269 | ||
43bd33f2 | 270 | static struct comedi_subdevice * |
da56fdc6 | 271 | comedi_read_subdevice(const struct comedi_device *dev, unsigned int minor) |
43bd33f2 | 272 | { |
bd5b4173 | 273 | struct comedi_subdevice *s; |
da56fdc6 IA |
274 | |
275 | if (minor >= COMEDI_NUM_BOARD_MINORS) { | |
63ab0395 | 276 | s = comedi_subdevice_from_minor(dev, minor); |
88cc30cf | 277 | if (!s || (s->subdev_flags & SDF_CMD_READ)) |
bd5b4173 | 278 | return s; |
da56fdc6 IA |
279 | } |
280 | return dev->read_subdev; | |
43bd33f2 HS |
281 | } |
282 | ||
283 | static struct comedi_subdevice * | |
da56fdc6 | 284 | comedi_write_subdevice(const struct comedi_device *dev, unsigned int minor) |
43bd33f2 | 285 | { |
bd5b4173 | 286 | struct comedi_subdevice *s; |
da56fdc6 IA |
287 | |
288 | if (minor >= COMEDI_NUM_BOARD_MINORS) { | |
63ab0395 | 289 | s = comedi_subdevice_from_minor(dev, minor); |
88cc30cf | 290 | if (!s || (s->subdev_flags & SDF_CMD_WRITE)) |
bd5b4173 | 291 | return s; |
da56fdc6 IA |
292 | } |
293 | return dev->write_subdev; | |
43bd33f2 HS |
294 | } |
295 | ||
20f083c0 IA |
296 | static void comedi_file_reset(struct file *file) |
297 | { | |
298 | struct comedi_file *cfp = file->private_data; | |
299 | struct comedi_device *dev = cfp->dev; | |
300 | struct comedi_subdevice *s, *read_s, *write_s; | |
301 | unsigned int minor = iminor(file_inode(file)); | |
302 | ||
303 | read_s = dev->read_subdev; | |
304 | write_s = dev->write_subdev; | |
305 | if (minor >= COMEDI_NUM_BOARD_MINORS) { | |
306 | s = comedi_subdevice_from_minor(dev, minor); | |
88cc30cf | 307 | if (!s || s->subdev_flags & SDF_CMD_READ) |
20f083c0 | 308 | read_s = s; |
88cc30cf | 309 | if (!s || s->subdev_flags & SDF_CMD_WRITE) |
20f083c0 IA |
310 | write_s = s; |
311 | } | |
312 | cfp->last_attached = dev->attached; | |
313 | cfp->last_detach_count = dev->detach_count; | |
314 | ACCESS_ONCE(cfp->read_subdev) = read_s; | |
315 | ACCESS_ONCE(cfp->write_subdev) = write_s; | |
316 | } | |
317 | ||
318 | static void comedi_file_check(struct file *file) | |
319 | { | |
320 | struct comedi_file *cfp = file->private_data; | |
321 | struct comedi_device *dev = cfp->dev; | |
322 | ||
323 | if (cfp->last_attached != dev->attached || | |
324 | cfp->last_detach_count != dev->detach_count) | |
325 | comedi_file_reset(file); | |
326 | } | |
327 | ||
328 | static struct comedi_subdevice *comedi_file_read_subdevice(struct file *file) | |
329 | { | |
330 | struct comedi_file *cfp = file->private_data; | |
331 | ||
332 | comedi_file_check(file); | |
333 | return ACCESS_ONCE(cfp->read_subdev); | |
334 | } | |
335 | ||
336 | static struct comedi_subdevice *comedi_file_write_subdevice(struct file *file) | |
337 | { | |
338 | struct comedi_file *cfp = file->private_data; | |
339 | ||
340 | comedi_file_check(file); | |
341 | return ACCESS_ONCE(cfp->write_subdev); | |
342 | } | |
343 | ||
883db3d9 | 344 | static int resize_async_buffer(struct comedi_device *dev, |
482f0a21 | 345 | struct comedi_subdevice *s, unsigned new_size) |
a5011a26 | 346 | { |
482f0a21 | 347 | struct comedi_async *async = s->async; |
a5011a26 HS |
348 | int retval; |
349 | ||
350 | if (new_size > async->max_bufsize) | |
351 | return -EPERM; | |
352 | ||
353 | if (s->busy) { | |
272850f0 HS |
354 | dev_dbg(dev->class_dev, |
355 | "subdevice is busy, cannot resize buffer\n"); | |
a5011a26 HS |
356 | return -EBUSY; |
357 | } | |
d4526ab4 | 358 | if (comedi_buf_is_mmapped(s)) { |
272850f0 HS |
359 | dev_dbg(dev->class_dev, |
360 | "subdevice is mmapped, cannot resize buffer\n"); | |
a5011a26 HS |
361 | return -EBUSY; |
362 | } | |
363 | ||
a2aab8b4 | 364 | /* make sure buffer is an integral number of pages (we round up) */ |
a5011a26 HS |
365 | new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK; |
366 | ||
367 | retval = comedi_buf_alloc(dev, s, new_size); | |
368 | if (retval < 0) | |
369 | return retval; | |
370 | ||
371 | if (s->buf_change) { | |
d546b896 | 372 | retval = s->buf_change(dev, s); |
a5011a26 HS |
373 | if (retval < 0) |
374 | return retval; | |
375 | } | |
376 | ||
272850f0 HS |
377 | dev_dbg(dev->class_dev, "subd %d buffer resized to %i bytes\n", |
378 | s->index, async->prealloc_bufsz); | |
a5011a26 HS |
379 | return 0; |
380 | } | |
381 | ||
382 | /* sysfs attribute files */ | |
383 | ||
e56341ad | 384 | static ssize_t max_read_buffer_kb_show(struct device *csdev, |
a5011a26 HS |
385 | struct device_attribute *attr, char *buf) |
386 | { | |
c88db469 | 387 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
388 | struct comedi_device *dev; |
389 | struct comedi_subdevice *s; | |
72fd9fac | 390 | unsigned int size = 0; |
a5011a26 | 391 | |
be535c9a | 392 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 393 | if (!dev) |
c88db469 IA |
394 | return -ENODEV; |
395 | ||
7f4656c5 | 396 | mutex_lock(&dev->mutex); |
da56fdc6 | 397 | s = comedi_read_subdevice(dev, minor); |
72fd9fac HS |
398 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
399 | size = s->async->max_bufsize / 1024; | |
7f4656c5 | 400 | mutex_unlock(&dev->mutex); |
a5011a26 | 401 | |
be535c9a | 402 | comedi_dev_put(dev); |
ecd56ff9 | 403 | return snprintf(buf, PAGE_SIZE, "%u\n", size); |
a5011a26 HS |
404 | } |
405 | ||
e56341ad | 406 | static ssize_t max_read_buffer_kb_store(struct device *csdev, |
a5011a26 HS |
407 | struct device_attribute *attr, |
408 | const char *buf, size_t count) | |
409 | { | |
c88db469 | 410 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
411 | struct comedi_device *dev; |
412 | struct comedi_subdevice *s; | |
72fd9fac HS |
413 | unsigned int size; |
414 | int err; | |
415 | ||
416 | err = kstrtouint(buf, 10, &size); | |
417 | if (err) | |
418 | return err; | |
419 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 420 | return -EINVAL; |
72fd9fac | 421 | size *= 1024; |
a5011a26 | 422 | |
be535c9a | 423 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 424 | if (!dev) |
c88db469 IA |
425 | return -ENODEV; |
426 | ||
7f4656c5 | 427 | mutex_lock(&dev->mutex); |
da56fdc6 | 428 | s = comedi_read_subdevice(dev, minor); |
72fd9fac HS |
429 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
430 | s->async->max_bufsize = size; | |
431 | else | |
432 | err = -EINVAL; | |
7f4656c5 | 433 | mutex_unlock(&dev->mutex); |
a5011a26 | 434 | |
be535c9a | 435 | comedi_dev_put(dev); |
72fd9fac | 436 | return err ? err : count; |
a5011a26 | 437 | } |
e56341ad | 438 | static DEVICE_ATTR_RW(max_read_buffer_kb); |
a5011a26 | 439 | |
e56341ad | 440 | static ssize_t read_buffer_kb_show(struct device *csdev, |
a5011a26 HS |
441 | struct device_attribute *attr, char *buf) |
442 | { | |
c88db469 | 443 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
444 | struct comedi_device *dev; |
445 | struct comedi_subdevice *s; | |
72fd9fac | 446 | unsigned int size = 0; |
a5011a26 | 447 | |
be535c9a | 448 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 449 | if (!dev) |
c88db469 IA |
450 | return -ENODEV; |
451 | ||
7f4656c5 | 452 | mutex_lock(&dev->mutex); |
da56fdc6 | 453 | s = comedi_read_subdevice(dev, minor); |
72fd9fac HS |
454 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
455 | size = s->async->prealloc_bufsz / 1024; | |
7f4656c5 | 456 | mutex_unlock(&dev->mutex); |
a5011a26 | 457 | |
be535c9a | 458 | comedi_dev_put(dev); |
ecd56ff9 | 459 | return snprintf(buf, PAGE_SIZE, "%u\n", size); |
a5011a26 HS |
460 | } |
461 | ||
e56341ad | 462 | static ssize_t read_buffer_kb_store(struct device *csdev, |
a5011a26 HS |
463 | struct device_attribute *attr, |
464 | const char *buf, size_t count) | |
465 | { | |
c88db469 | 466 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
467 | struct comedi_device *dev; |
468 | struct comedi_subdevice *s; | |
72fd9fac HS |
469 | unsigned int size; |
470 | int err; | |
471 | ||
472 | err = kstrtouint(buf, 10, &size); | |
473 | if (err) | |
474 | return err; | |
475 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 476 | return -EINVAL; |
72fd9fac | 477 | size *= 1024; |
a5011a26 | 478 | |
be535c9a | 479 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 480 | if (!dev) |
c88db469 IA |
481 | return -ENODEV; |
482 | ||
7f4656c5 | 483 | mutex_lock(&dev->mutex); |
da56fdc6 | 484 | s = comedi_read_subdevice(dev, minor); |
72fd9fac | 485 | if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
482f0a21 | 486 | err = resize_async_buffer(dev, s, size); |
72fd9fac HS |
487 | else |
488 | err = -EINVAL; | |
7f4656c5 | 489 | mutex_unlock(&dev->mutex); |
a5011a26 | 490 | |
be535c9a | 491 | comedi_dev_put(dev); |
72fd9fac | 492 | return err ? err : count; |
a5011a26 | 493 | } |
e56341ad | 494 | static DEVICE_ATTR_RW(read_buffer_kb); |
883db3d9 | 495 | |
e56341ad | 496 | static ssize_t max_write_buffer_kb_show(struct device *csdev, |
a5011a26 HS |
497 | struct device_attribute *attr, |
498 | char *buf) | |
499 | { | |
c88db469 | 500 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
501 | struct comedi_device *dev; |
502 | struct comedi_subdevice *s; | |
72fd9fac | 503 | unsigned int size = 0; |
a5011a26 | 504 | |
be535c9a | 505 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 506 | if (!dev) |
c88db469 IA |
507 | return -ENODEV; |
508 | ||
7f4656c5 | 509 | mutex_lock(&dev->mutex); |
da56fdc6 | 510 | s = comedi_write_subdevice(dev, minor); |
72fd9fac HS |
511 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
512 | size = s->async->max_bufsize / 1024; | |
7f4656c5 | 513 | mutex_unlock(&dev->mutex); |
a5011a26 | 514 | |
be535c9a | 515 | comedi_dev_put(dev); |
ecd56ff9 | 516 | return snprintf(buf, PAGE_SIZE, "%u\n", size); |
a5011a26 HS |
517 | } |
518 | ||
e56341ad | 519 | static ssize_t max_write_buffer_kb_store(struct device *csdev, |
a5011a26 HS |
520 | struct device_attribute *attr, |
521 | const char *buf, size_t count) | |
522 | { | |
c88db469 | 523 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
524 | struct comedi_device *dev; |
525 | struct comedi_subdevice *s; | |
72fd9fac HS |
526 | unsigned int size; |
527 | int err; | |
528 | ||
529 | err = kstrtouint(buf, 10, &size); | |
530 | if (err) | |
531 | return err; | |
532 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 533 | return -EINVAL; |
72fd9fac | 534 | size *= 1024; |
a5011a26 | 535 | |
be535c9a | 536 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 537 | if (!dev) |
c88db469 IA |
538 | return -ENODEV; |
539 | ||
7f4656c5 | 540 | mutex_lock(&dev->mutex); |
da56fdc6 | 541 | s = comedi_write_subdevice(dev, minor); |
72fd9fac HS |
542 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
543 | s->async->max_bufsize = size; | |
544 | else | |
545 | err = -EINVAL; | |
7f4656c5 | 546 | mutex_unlock(&dev->mutex); |
a5011a26 | 547 | |
be535c9a | 548 | comedi_dev_put(dev); |
72fd9fac | 549 | return err ? err : count; |
a5011a26 | 550 | } |
e56341ad | 551 | static DEVICE_ATTR_RW(max_write_buffer_kb); |
a5011a26 | 552 | |
e56341ad | 553 | static ssize_t write_buffer_kb_show(struct device *csdev, |
a5011a26 HS |
554 | struct device_attribute *attr, char *buf) |
555 | { | |
c88db469 | 556 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
557 | struct comedi_device *dev; |
558 | struct comedi_subdevice *s; | |
72fd9fac | 559 | unsigned int size = 0; |
a5011a26 | 560 | |
be535c9a | 561 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 562 | if (!dev) |
c88db469 IA |
563 | return -ENODEV; |
564 | ||
7f4656c5 | 565 | mutex_lock(&dev->mutex); |
da56fdc6 | 566 | s = comedi_write_subdevice(dev, minor); |
72fd9fac HS |
567 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
568 | size = s->async->prealloc_bufsz / 1024; | |
7f4656c5 | 569 | mutex_unlock(&dev->mutex); |
a5011a26 | 570 | |
be535c9a | 571 | comedi_dev_put(dev); |
ecd56ff9 | 572 | return snprintf(buf, PAGE_SIZE, "%u\n", size); |
a5011a26 HS |
573 | } |
574 | ||
e56341ad | 575 | static ssize_t write_buffer_kb_store(struct device *csdev, |
a5011a26 HS |
576 | struct device_attribute *attr, |
577 | const char *buf, size_t count) | |
578 | { | |
c88db469 | 579 | unsigned int minor = MINOR(csdev->devt); |
7f4656c5 IA |
580 | struct comedi_device *dev; |
581 | struct comedi_subdevice *s; | |
72fd9fac HS |
582 | unsigned int size; |
583 | int err; | |
584 | ||
585 | err = kstrtouint(buf, 10, &size); | |
586 | if (err) | |
587 | return err; | |
588 | if (size > (UINT_MAX / 1024)) | |
a5011a26 | 589 | return -EINVAL; |
72fd9fac | 590 | size *= 1024; |
a5011a26 | 591 | |
be535c9a | 592 | dev = comedi_dev_get_from_minor(minor); |
5e04c254 | 593 | if (!dev) |
c88db469 IA |
594 | return -ENODEV; |
595 | ||
7f4656c5 | 596 | mutex_lock(&dev->mutex); |
da56fdc6 | 597 | s = comedi_write_subdevice(dev, minor); |
72fd9fac | 598 | if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
482f0a21 | 599 | err = resize_async_buffer(dev, s, size); |
72fd9fac HS |
600 | else |
601 | err = -EINVAL; | |
7f4656c5 | 602 | mutex_unlock(&dev->mutex); |
a5011a26 | 603 | |
be535c9a | 604 | comedi_dev_put(dev); |
72fd9fac | 605 | return err ? err : count; |
a5011a26 | 606 | } |
e56341ad GKH |
607 | static DEVICE_ATTR_RW(write_buffer_kb); |
608 | ||
609 | static struct attribute *comedi_dev_attrs[] = { | |
610 | &dev_attr_max_read_buffer_kb.attr, | |
611 | &dev_attr_read_buffer_kb.attr, | |
612 | &dev_attr_max_write_buffer_kb.attr, | |
613 | &dev_attr_write_buffer_kb.attr, | |
614 | NULL, | |
a5011a26 | 615 | }; |
e56341ad | 616 | ATTRIBUTE_GROUPS(comedi_dev); |
ed9eccbe | 617 | |
ef4b4b27 IA |
618 | static void __comedi_clear_subdevice_runflags(struct comedi_subdevice *s, |
619 | unsigned bits) | |
620 | { | |
621 | s->runflags &= ~bits; | |
622 | } | |
623 | ||
624 | static void __comedi_set_subdevice_runflags(struct comedi_subdevice *s, | |
625 | unsigned bits) | |
626 | { | |
627 | s->runflags |= bits; | |
628 | } | |
629 | ||
cc64ea42 IA |
630 | static void comedi_update_subdevice_runflags(struct comedi_subdevice *s, |
631 | unsigned mask, unsigned bits) | |
2aae0076 HS |
632 | { |
633 | unsigned long flags; | |
634 | ||
635 | spin_lock_irqsave(&s->spin_lock, flags); | |
ef4b4b27 IA |
636 | __comedi_clear_subdevice_runflags(s, mask); |
637 | __comedi_set_subdevice_runflags(s, bits & mask); | |
2aae0076 HS |
638 | spin_unlock_irqrestore(&s->spin_lock, flags); |
639 | } | |
640 | ||
ef4b4b27 IA |
641 | static unsigned __comedi_get_subdevice_runflags(struct comedi_subdevice *s) |
642 | { | |
643 | return s->runflags; | |
644 | } | |
645 | ||
ade1764f | 646 | static unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s) |
74120719 HS |
647 | { |
648 | unsigned long flags; | |
649 | unsigned runflags; | |
650 | ||
651 | spin_lock_irqsave(&s->spin_lock, flags); | |
ef4b4b27 | 652 | runflags = __comedi_get_subdevice_runflags(s); |
74120719 HS |
653 | spin_unlock_irqrestore(&s->spin_lock, flags); |
654 | return runflags; | |
655 | } | |
74120719 | 656 | |
b183a836 IA |
657 | static bool comedi_is_runflags_running(unsigned runflags) |
658 | { | |
659 | return runflags & COMEDI_SRF_RUNNING; | |
660 | } | |
661 | ||
662 | static bool comedi_is_runflags_in_error(unsigned runflags) | |
663 | { | |
664 | return runflags & COMEDI_SRF_ERROR; | |
665 | } | |
666 | ||
dd630cde | 667 | /** |
a3e39942 IA |
668 | * comedi_is_subdevice_running() - Check if async command running on subdevice |
669 | * @s: COMEDI subdevice. | |
dd630cde | 670 | * |
a3e39942 IA |
671 | * Return: %true if an asynchronous COMEDI command is active on the |
672 | * subdevice, else %false. | |
dd630cde | 673 | */ |
e0dac318 HS |
674 | bool comedi_is_subdevice_running(struct comedi_subdevice *s) |
675 | { | |
676 | unsigned runflags = comedi_get_subdevice_runflags(s); | |
677 | ||
b183a836 | 678 | return comedi_is_runflags_running(runflags); |
e0dac318 HS |
679 | } |
680 | EXPORT_SYMBOL_GPL(comedi_is_subdevice_running); | |
681 | ||
ef4b4b27 IA |
682 | static bool __comedi_is_subdevice_running(struct comedi_subdevice *s) |
683 | { | |
684 | unsigned runflags = __comedi_get_subdevice_runflags(s); | |
685 | ||
686 | return comedi_is_runflags_running(runflags); | |
687 | } | |
688 | ||
8fc369ae IA |
689 | bool comedi_can_auto_free_spriv(struct comedi_subdevice *s) |
690 | { | |
691 | unsigned runflags = __comedi_get_subdevice_runflags(s); | |
692 | ||
693 | return runflags & COMEDI_SRF_FREE_SPRIV; | |
694 | } | |
695 | ||
696 | /** | |
a3e39942 IA |
697 | * comedi_set_spriv_auto_free() - Mark subdevice private data as freeable |
698 | * @s: COMEDI subdevice. | |
8fc369ae IA |
699 | * |
700 | * Mark the subdevice as having a pointer to private data that can be | |
a3e39942 IA |
701 | * automatically freed when the COMEDI device is detached from the low-level |
702 | * driver. | |
8fc369ae IA |
703 | */ |
704 | void comedi_set_spriv_auto_free(struct comedi_subdevice *s) | |
705 | { | |
706 | __comedi_set_subdevice_runflags(s, COMEDI_SRF_FREE_SPRIV); | |
707 | } | |
708 | EXPORT_SYMBOL_GPL(comedi_set_spriv_auto_free); | |
709 | ||
588ba6dc | 710 | /** |
a3e39942 IA |
711 | * comedi_alloc_spriv - Allocate memory for the subdevice private data |
712 | * @s: COMEDI subdevice. | |
713 | * @size: Size of the memory to allocate. | |
588ba6dc | 714 | * |
a3e39942 IA |
715 | * Allocate memory for the subdevice private data and point @s->private |
716 | * to it. The memory will be freed automatically when the COMEDI device | |
717 | * is detached from the low-level driver. | |
718 | * | |
719 | * Return: A pointer to the allocated memory @s->private on success. | |
720 | * Return NULL on failure. | |
588ba6dc | 721 | */ |
0480bcb9 | 722 | void *comedi_alloc_spriv(struct comedi_subdevice *s, size_t size) |
588ba6dc | 723 | { |
0480bcb9 HS |
724 | s->private = kzalloc(size, GFP_KERNEL); |
725 | if (s->private) | |
8fc369ae | 726 | comedi_set_spriv_auto_free(s); |
0480bcb9 | 727 | return s->private; |
588ba6dc | 728 | } |
0480bcb9 | 729 | EXPORT_SYMBOL_GPL(comedi_alloc_spriv); |
588ba6dc | 730 | |
2aae0076 | 731 | /* |
a2aab8b4 | 732 | * This function restores a subdevice to an idle state. |
2aae0076 HS |
733 | */ |
734 | static void do_become_nonbusy(struct comedi_device *dev, | |
735 | struct comedi_subdevice *s) | |
736 | { | |
737 | struct comedi_async *async = s->async; | |
738 | ||
cc64ea42 | 739 | comedi_update_subdevice_runflags(s, COMEDI_SRF_RUNNING, 0); |
2aae0076 | 740 | if (async) { |
fcc18a9a | 741 | comedi_buf_reset(s); |
2aae0076 HS |
742 | async->inttrig = NULL; |
743 | kfree(async->cmd.chanlist); | |
744 | async->cmd.chanlist = NULL; | |
8da8c86f | 745 | s->busy = NULL; |
258c1dd7 | 746 | wake_up_interruptible_all(&async->wait_head); |
2aae0076 HS |
747 | } else { |
748 | dev_err(dev->class_dev, | |
749 | "BUG: (?) do_become_nonbusy called with async=NULL\n"); | |
8da8c86f | 750 | s->busy = NULL; |
2aae0076 | 751 | } |
2aae0076 HS |
752 | } |
753 | ||
754 | static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s) | |
755 | { | |
756 | int ret = 0; | |
757 | ||
f0124630 | 758 | if (comedi_is_subdevice_running(s) && s->cancel) |
2aae0076 HS |
759 | ret = s->cancel(dev, s); |
760 | ||
761 | do_become_nonbusy(dev, s); | |
762 | ||
763 | return ret; | |
764 | } | |
765 | ||
d19db51a IA |
766 | void comedi_device_cancel_all(struct comedi_device *dev) |
767 | { | |
768 | struct comedi_subdevice *s; | |
769 | int i; | |
770 | ||
771 | if (!dev->attached) | |
772 | return; | |
773 | ||
774 | for (i = 0; i < dev->n_subdevices; i++) { | |
775 | s = &dev->subdevices[i]; | |
776 | if (s->async) | |
777 | do_cancel(dev, s); | |
778 | } | |
779 | } | |
780 | ||
2aae0076 HS |
781 | static int is_device_busy(struct comedi_device *dev) |
782 | { | |
783 | struct comedi_subdevice *s; | |
784 | int i; | |
785 | ||
786 | if (!dev->attached) | |
787 | return 0; | |
788 | ||
789 | for (i = 0; i < dev->n_subdevices; i++) { | |
790 | s = &dev->subdevices[i]; | |
791 | if (s->busy) | |
792 | return 1; | |
d4526ab4 | 793 | if (s->async && comedi_buf_is_mmapped(s)) |
2aae0076 HS |
794 | return 1; |
795 | } | |
796 | ||
797 | return 0; | |
798 | } | |
799 | ||
ed9eccbe | 800 | /* |
18e01b24 IA |
801 | * COMEDI_DEVCONFIG ioctl |
802 | * attaches (and configures) or detaches a legacy device | |
803 | * | |
804 | * arg: | |
805 | * pointer to comedi_devconfig structure (NULL if detaching) | |
806 | * | |
807 | * reads: | |
808 | * comedi_devconfig structure (if attaching) | |
809 | * | |
810 | * writes: | |
811 | * nothing | |
812 | */ | |
0a85b6f0 | 813 | static int do_devconfig_ioctl(struct comedi_device *dev, |
92d0127c | 814 | struct comedi_devconfig __user *arg) |
ed9eccbe | 815 | { |
0707bb04 | 816 | struct comedi_devconfig it; |
ed9eccbe DS |
817 | |
818 | if (!capable(CAP_SYS_ADMIN)) | |
819 | return -EPERM; | |
820 | ||
88cc30cf | 821 | if (!arg) { |
ed9eccbe DS |
822 | if (is_device_busy(dev)) |
823 | return -EBUSY; | |
476b8477 | 824 | if (dev->attached) { |
ed9eccbe | 825 | struct module *driver_module = dev->driver->module; |
4bac39f6 | 826 | |
ed9eccbe DS |
827 | comedi_device_detach(dev); |
828 | module_put(driver_module); | |
829 | } | |
830 | return 0; | |
831 | } | |
832 | ||
bc252fd1 | 833 | if (copy_from_user(&it, arg, sizeof(it))) |
ed9eccbe DS |
834 | return -EFAULT; |
835 | ||
836 | it.board_name[COMEDI_NAMELEN - 1] = 0; | |
837 | ||
d1843132 HS |
838 | if (it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) { |
839 | dev_warn(dev->class_dev, | |
840 | "comedi_config --init_data is deprecated\n"); | |
841 | return -EINVAL; | |
ed9eccbe DS |
842 | } |
843 | ||
8ab4ed6e IA |
844 | if (dev->minor >= comedi_num_legacy_minors) |
845 | /* don't re-use dynamically allocated comedi devices */ | |
846 | return -EBUSY; | |
847 | ||
b2a644b4 IA |
848 | /* This increments the driver module count on success. */ |
849 | return comedi_device_attach(dev, &it); | |
ed9eccbe DS |
850 | } |
851 | ||
852 | /* | |
18e01b24 IA |
853 | * COMEDI_BUFCONFIG ioctl |
854 | * buffer configuration | |
855 | * | |
856 | * arg: | |
857 | * pointer to comedi_bufconfig structure | |
858 | * | |
859 | * reads: | |
860 | * comedi_bufconfig structure | |
861 | * | |
862 | * writes: | |
863 | * modified comedi_bufconfig structure | |
864 | */ | |
92d0127c GKH |
865 | static int do_bufconfig_ioctl(struct comedi_device *dev, |
866 | struct comedi_bufconfig __user *arg) | |
ed9eccbe | 867 | { |
be6aba4a | 868 | struct comedi_bufconfig bc; |
d163679c | 869 | struct comedi_async *async; |
34c43922 | 870 | struct comedi_subdevice *s; |
883db3d9 | 871 | int retval = 0; |
ed9eccbe | 872 | |
bc252fd1 | 873 | if (copy_from_user(&bc, arg, sizeof(bc))) |
ed9eccbe DS |
874 | return -EFAULT; |
875 | ||
11f80ddf | 876 | if (bc.subdevice >= dev->n_subdevices) |
ed9eccbe DS |
877 | return -EINVAL; |
878 | ||
b077f2cd | 879 | s = &dev->subdevices[bc.subdevice]; |
ed9eccbe DS |
880 | async = s->async; |
881 | ||
882 | if (!async) { | |
272850f0 HS |
883 | dev_dbg(dev->class_dev, |
884 | "subdevice does not have async capability\n"); | |
ed9eccbe DS |
885 | bc.size = 0; |
886 | bc.maximum_size = 0; | |
887 | goto copyback; | |
888 | } | |
889 | ||
890 | if (bc.maximum_size) { | |
891 | if (!capable(CAP_SYS_ADMIN)) | |
892 | return -EPERM; | |
893 | ||
894 | async->max_bufsize = bc.maximum_size; | |
895 | } | |
896 | ||
897 | if (bc.size) { | |
482f0a21 | 898 | retval = resize_async_buffer(dev, s, bc.size); |
883db3d9 FMH |
899 | if (retval < 0) |
900 | return retval; | |
ed9eccbe DS |
901 | } |
902 | ||
903 | bc.size = async->prealloc_bufsz; | |
904 | bc.maximum_size = async->max_bufsize; | |
905 | ||
476b8477 | 906 | copyback: |
bc252fd1 | 907 | if (copy_to_user(arg, &bc, sizeof(bc))) |
ed9eccbe DS |
908 | return -EFAULT; |
909 | ||
910 | return 0; | |
911 | } | |
912 | ||
913 | /* | |
18e01b24 IA |
914 | * COMEDI_DEVINFO ioctl |
915 | * device info | |
916 | * | |
917 | * arg: | |
918 | * pointer to comedi_devinfo structure | |
919 | * | |
920 | * reads: | |
921 | * nothing | |
922 | * | |
923 | * writes: | |
924 | * comedi_devinfo structure | |
925 | */ | |
0a85b6f0 | 926 | static int do_devinfo_ioctl(struct comedi_device *dev, |
92d0127c GKH |
927 | struct comedi_devinfo __user *arg, |
928 | struct file *file) | |
ed9eccbe | 929 | { |
0e700923 HS |
930 | struct comedi_subdevice *s; |
931 | struct comedi_devinfo devinfo; | |
ed9eccbe DS |
932 | |
933 | memset(&devinfo, 0, sizeof(devinfo)); | |
934 | ||
935 | /* fill devinfo structure */ | |
936 | devinfo.version_code = COMEDI_VERSION_CODE; | |
937 | devinfo.n_subdevs = dev->n_subdevices; | |
819cbb12 VK |
938 | strlcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN); |
939 | strlcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN); | |
ed9eccbe | 940 | |
20f083c0 | 941 | s = comedi_file_read_subdevice(file); |
0e700923 | 942 | if (s) |
90a35c15 | 943 | devinfo.read_subdevice = s->index; |
476b8477 | 944 | else |
ed9eccbe | 945 | devinfo.read_subdevice = -1; |
476b8477 | 946 | |
20f083c0 | 947 | s = comedi_file_write_subdevice(file); |
0e700923 | 948 | if (s) |
90a35c15 | 949 | devinfo.write_subdevice = s->index; |
476b8477 | 950 | else |
ed9eccbe | 951 | devinfo.write_subdevice = -1; |
ed9eccbe | 952 | |
bc252fd1 | 953 | if (copy_to_user(arg, &devinfo, sizeof(devinfo))) |
ed9eccbe DS |
954 | return -EFAULT; |
955 | ||
956 | return 0; | |
957 | } | |
958 | ||
959 | /* | |
18e01b24 IA |
960 | * COMEDI_SUBDINFO ioctl |
961 | * subdevices info | |
962 | * | |
963 | * arg: | |
964 | * pointer to array of comedi_subdinfo structures | |
965 | * | |
966 | * reads: | |
967 | * nothing | |
968 | * | |
969 | * writes: | |
970 | * array of comedi_subdinfo structures | |
971 | */ | |
0a85b6f0 | 972 | static int do_subdinfo_ioctl(struct comedi_device *dev, |
92d0127c | 973 | struct comedi_subdinfo __user *arg, void *file) |
ed9eccbe DS |
974 | { |
975 | int ret, i; | |
bd52efbb | 976 | struct comedi_subdinfo *tmp, *us; |
34c43922 | 977 | struct comedi_subdevice *s; |
ed9eccbe | 978 | |
bc252fd1 | 979 | tmp = kcalloc(dev->n_subdevices, sizeof(*tmp), GFP_KERNEL); |
ed9eccbe DS |
980 | if (!tmp) |
981 | return -ENOMEM; | |
982 | ||
983 | /* fill subdinfo structs */ | |
984 | for (i = 0; i < dev->n_subdevices; i++) { | |
b077f2cd | 985 | s = &dev->subdevices[i]; |
ed9eccbe DS |
986 | us = tmp + i; |
987 | ||
988 | us->type = s->type; | |
989 | us->n_chan = s->n_chan; | |
990 | us->subd_flags = s->subdev_flags; | |
f0124630 | 991 | if (comedi_is_subdevice_running(s)) |
ed9eccbe DS |
992 | us->subd_flags |= SDF_RUNNING; |
993 | #define TIMER_nanosec 5 /* backwards compatibility */ | |
994 | us->timer_type = TIMER_nanosec; | |
995 | us->len_chanlist = s->len_chanlist; | |
996 | us->maxdata = s->maxdata; | |
997 | if (s->range_table) { | |
998 | us->range_type = | |
476b8477 | 999 | (i << 24) | (0 << 16) | (s->range_table->length); |
ed9eccbe DS |
1000 | } else { |
1001 | us->range_type = 0; /* XXX */ | |
1002 | } | |
ed9eccbe DS |
1003 | |
1004 | if (s->busy) | |
1005 | us->subd_flags |= SDF_BUSY; | |
1006 | if (s->busy == file) | |
1007 | us->subd_flags |= SDF_BUSY_OWNER; | |
1008 | if (s->lock) | |
1009 | us->subd_flags |= SDF_LOCKED; | |
1010 | if (s->lock == file) | |
1011 | us->subd_flags |= SDF_LOCK_OWNER; | |
1012 | if (!s->maxdata && s->maxdata_list) | |
1013 | us->subd_flags |= SDF_MAXDATA; | |
ed9eccbe DS |
1014 | if (s->range_table_list) |
1015 | us->subd_flags |= SDF_RANGETYPE; | |
1016 | if (s->do_cmd) | |
1017 | us->subd_flags |= SDF_CMD; | |
1018 | ||
1019 | if (s->insn_bits != &insn_inval) | |
1020 | us->insn_bits_support = COMEDI_SUPPORTED; | |
1021 | else | |
1022 | us->insn_bits_support = COMEDI_UNSUPPORTED; | |
ed9eccbe DS |
1023 | } |
1024 | ||
bc252fd1 | 1025 | ret = copy_to_user(arg, tmp, dev->n_subdevices * sizeof(*tmp)); |
ed9eccbe DS |
1026 | |
1027 | kfree(tmp); | |
1028 | ||
1029 | return ret ? -EFAULT : 0; | |
1030 | } | |
1031 | ||
1032 | /* | |
18e01b24 IA |
1033 | * COMEDI_CHANINFO ioctl |
1034 | * subdevice channel info | |
1035 | * | |
1036 | * arg: | |
1037 | * pointer to comedi_chaninfo structure | |
1038 | * | |
1039 | * reads: | |
1040 | * comedi_chaninfo structure | |
1041 | * | |
1042 | * writes: | |
1043 | * array of maxdata values to chaninfo->maxdata_list if requested | |
1044 | * array of range table lengths to chaninfo->range_table_list if requested | |
1045 | */ | |
0a85b6f0 | 1046 | static int do_chaninfo_ioctl(struct comedi_device *dev, |
92d0127c | 1047 | struct comedi_chaninfo __user *arg) |
ed9eccbe | 1048 | { |
34c43922 | 1049 | struct comedi_subdevice *s; |
a18b416d | 1050 | struct comedi_chaninfo it; |
ed9eccbe | 1051 | |
bc252fd1 | 1052 | if (copy_from_user(&it, arg, sizeof(it))) |
ed9eccbe DS |
1053 | return -EFAULT; |
1054 | ||
1055 | if (it.subdev >= dev->n_subdevices) | |
1056 | return -EINVAL; | |
b077f2cd | 1057 | s = &dev->subdevices[it.subdev]; |
ed9eccbe DS |
1058 | |
1059 | if (it.maxdata_list) { | |
1060 | if (s->maxdata || !s->maxdata_list) | |
1061 | return -EINVAL; | |
1062 | if (copy_to_user(it.maxdata_list, s->maxdata_list, | |
790c5541 | 1063 | s->n_chan * sizeof(unsigned int))) |
ed9eccbe DS |
1064 | return -EFAULT; |
1065 | } | |
1066 | ||
64d9b1d2 IA |
1067 | if (it.flaglist) |
1068 | return -EINVAL; /* flaglist not supported */ | |
ed9eccbe DS |
1069 | |
1070 | if (it.rangelist) { | |
1071 | int i; | |
1072 | ||
1073 | if (!s->range_table_list) | |
1074 | return -EINVAL; | |
1075 | for (i = 0; i < s->n_chan; i++) { | |
1076 | int x; | |
1077 | ||
1078 | x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) | | |
476b8477 | 1079 | (s->range_table_list[i]->length); |
81604d43 VK |
1080 | if (put_user(x, it.rangelist + i)) |
1081 | return -EFAULT; | |
ed9eccbe | 1082 | } |
ed9eccbe DS |
1083 | } |
1084 | ||
1085 | return 0; | |
1086 | } | |
1087 | ||
18e01b24 IA |
1088 | /* |
1089 | * COMEDI_BUFINFO ioctl | |
1090 | * buffer information | |
1091 | * | |
1092 | * arg: | |
1093 | * pointer to comedi_bufinfo structure | |
1094 | * | |
1095 | * reads: | |
1096 | * comedi_bufinfo structure | |
1097 | * | |
1098 | * writes: | |
1099 | * modified comedi_bufinfo structure | |
1100 | */ | |
92d0127c | 1101 | static int do_bufinfo_ioctl(struct comedi_device *dev, |
53fa827e | 1102 | struct comedi_bufinfo __user *arg, void *file) |
ed9eccbe | 1103 | { |
9aa5339a | 1104 | struct comedi_bufinfo bi; |
34c43922 | 1105 | struct comedi_subdevice *s; |
d163679c | 1106 | struct comedi_async *async; |
36a51170 IA |
1107 | unsigned int runflags; |
1108 | int retval = 0; | |
06578561 | 1109 | bool become_nonbusy = false; |
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 | ||
57c563bf IA |
1121 | if (!async || s->busy != file) |
1122 | return -EINVAL; | |
ed9eccbe | 1123 | |
66c36502 IA |
1124 | if (!(async->cmd.flags & CMDF_WRITE)) { |
1125 | /* command was set up in "read" direction */ | |
1126 | if (bi.bytes_read) { | |
1127 | comedi_buf_read_alloc(s, bi.bytes_read); | |
1128 | bi.bytes_read = comedi_buf_read_free(s, bi.bytes_read); | |
ed9eccbe | 1129 | } |
36a51170 IA |
1130 | /* |
1131 | * If nothing left to read, and command has stopped, and | |
1132 | * {"read" position not updated or command stopped normally}, | |
1133 | * then become non-busy. | |
1134 | */ | |
1135 | runflags = comedi_get_subdevice_runflags(s); | |
1136 | if (comedi_buf_read_n_available(s) == 0 && | |
1137 | !comedi_is_runflags_running(runflags) && | |
1138 | (bi.bytes_read == 0 || | |
1139 | !comedi_is_runflags_in_error(runflags))) { | |
f3aa8c0b | 1140 | become_nonbusy = true; |
36a51170 IA |
1141 | if (comedi_is_runflags_in_error(runflags)) |
1142 | retval = -EPIPE; | |
1143 | } | |
66c36502 IA |
1144 | bi.bytes_written = 0; |
1145 | } else { | |
1146 | /* command was set up in "write" direction */ | |
bb0c6bfa IA |
1147 | if (!comedi_is_subdevice_running(s)) |
1148 | bi.bytes_written = 0; | |
66c36502 IA |
1149 | if (bi.bytes_written) { |
1150 | comedi_buf_write_alloc(s, bi.bytes_written); | |
1151 | bi.bytes_written = | |
1152 | comedi_buf_write_free(s, bi.bytes_written); | |
1153 | } | |
1154 | bi.bytes_read = 0; | |
ed9eccbe DS |
1155 | } |
1156 | ||
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 | ||
06578561 IA |
1162 | if (become_nonbusy) |
1163 | do_become_nonbusy(dev, s); | |
1164 | ||
36a51170 IA |
1165 | if (retval) |
1166 | return retval; | |
1167 | ||
bc252fd1 | 1168 | if (copy_to_user(arg, &bi, sizeof(bi))) |
ed9eccbe DS |
1169 | return -EFAULT; |
1170 | ||
1171 | return 0; | |
1172 | } | |
1173 | ||
0a85b6f0 MT |
1174 | static int check_insn_config_length(struct comedi_insn *insn, |
1175 | unsigned int *data) | |
ed9eccbe | 1176 | { |
476b8477 GKH |
1177 | if (insn->n < 1) |
1178 | return -EINVAL; | |
ed9eccbe DS |
1179 | |
1180 | switch (data[0]) { | |
1181 | case INSN_CONFIG_DIO_OUTPUT: | |
1182 | case INSN_CONFIG_DIO_INPUT: | |
1183 | case INSN_CONFIG_DISARM: | |
1184 | case INSN_CONFIG_RESET: | |
1185 | if (insn->n == 1) | |
1186 | return 0; | |
1187 | break; | |
1188 | case INSN_CONFIG_ARM: | |
1189 | case INSN_CONFIG_DIO_QUERY: | |
1190 | case INSN_CONFIG_BLOCK_SIZE: | |
1191 | case INSN_CONFIG_FILTER: | |
1192 | case INSN_CONFIG_SERIAL_CLOCK: | |
1193 | case INSN_CONFIG_BIDIRECTIONAL_DATA: | |
1194 | case INSN_CONFIG_ALT_SOURCE: | |
1195 | case INSN_CONFIG_SET_COUNTER_MODE: | |
1196 | case INSN_CONFIG_8254_READ_STATUS: | |
1197 | case INSN_CONFIG_SET_ROUTING: | |
1198 | case INSN_CONFIG_GET_ROUTING: | |
1199 | case INSN_CONFIG_GET_PWM_STATUS: | |
1200 | case INSN_CONFIG_PWM_SET_PERIOD: | |
1201 | case INSN_CONFIG_PWM_GET_PERIOD: | |
1202 | if (insn->n == 2) | |
1203 | return 0; | |
1204 | break; | |
1205 | case INSN_CONFIG_SET_GATE_SRC: | |
1206 | case INSN_CONFIG_GET_GATE_SRC: | |
1207 | case INSN_CONFIG_SET_CLOCK_SRC: | |
1208 | case INSN_CONFIG_GET_CLOCK_SRC: | |
1209 | case INSN_CONFIG_SET_OTHER_SRC: | |
1210 | case INSN_CONFIG_GET_COUNTER_STATUS: | |
1211 | case INSN_CONFIG_PWM_SET_H_BRIDGE: | |
1212 | case INSN_CONFIG_PWM_GET_H_BRIDGE: | |
1213 | case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE: | |
1214 | if (insn->n == 3) | |
1215 | return 0; | |
1216 | break; | |
1217 | case INSN_CONFIG_PWM_OUTPUT: | |
1218 | case INSN_CONFIG_ANALOG_TRIG: | |
1219 | if (insn->n == 5) | |
1220 | return 0; | |
1221 | break; | |
b0a2b6d8 IA |
1222 | case INSN_CONFIG_DIGITAL_TRIG: |
1223 | if (insn->n == 6) | |
1224 | return 0; | |
1225 | break; | |
a2aab8b4 IA |
1226 | /* |
1227 | * by default we allow the insn since we don't have checks for | |
1228 | * all possible cases yet | |
1229 | */ | |
ed9eccbe | 1230 | default: |
c2ad078b | 1231 | pr_warn("No check for data length of config insn id %i is implemented\n", |
4f870fe6 | 1232 | data[0]); |
c2ad078b HS |
1233 | pr_warn("Add a check to %s in %s\n", __func__, __FILE__); |
1234 | pr_warn("Assuming n=%i is correct\n", insn->n); | |
ed9eccbe | 1235 | return 0; |
ed9eccbe DS |
1236 | } |
1237 | return -EINVAL; | |
1238 | } | |
1239 | ||
0a85b6f0 MT |
1240 | static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn, |
1241 | unsigned int *data, void *file) | |
ed9eccbe | 1242 | { |
34c43922 | 1243 | struct comedi_subdevice *s; |
ed9eccbe DS |
1244 | int ret = 0; |
1245 | int i; | |
1246 | ||
1247 | if (insn->insn & INSN_MASK_SPECIAL) { | |
1248 | /* a non-subdevice instruction */ | |
1249 | ||
1250 | switch (insn->insn) { | |
1251 | case INSN_GTOD: | |
1252 | { | |
1253 | struct timeval tv; | |
1254 | ||
1255 | if (insn->n != 2) { | |
1256 | ret = -EINVAL; | |
1257 | break; | |
1258 | } | |
1259 | ||
1260 | do_gettimeofday(&tv); | |
1261 | data[0] = tv.tv_sec; | |
1262 | data[1] = tv.tv_usec; | |
1263 | ret = 2; | |
1264 | ||
1265 | break; | |
1266 | } | |
1267 | case INSN_WAIT: | |
1268 | if (insn->n != 1 || data[0] >= 100000) { | |
1269 | ret = -EINVAL; | |
1270 | break; | |
1271 | } | |
1272 | udelay(data[0] / 1000); | |
1273 | ret = 1; | |
1274 | break; | |
1275 | case INSN_INTTRIG: | |
1276 | if (insn->n != 1) { | |
1277 | ret = -EINVAL; | |
1278 | break; | |
1279 | } | |
1280 | if (insn->subdev >= dev->n_subdevices) { | |
272850f0 HS |
1281 | dev_dbg(dev->class_dev, |
1282 | "%d not usable subdevice\n", | |
ed9eccbe DS |
1283 | insn->subdev); |
1284 | ret = -EINVAL; | |
1285 | break; | |
1286 | } | |
b077f2cd | 1287 | s = &dev->subdevices[insn->subdev]; |
ed9eccbe | 1288 | if (!s->async) { |
272850f0 | 1289 | dev_dbg(dev->class_dev, "no async\n"); |
ed9eccbe DS |
1290 | ret = -EINVAL; |
1291 | break; | |
1292 | } | |
1293 | if (!s->async->inttrig) { | |
272850f0 | 1294 | dev_dbg(dev->class_dev, "no inttrig\n"); |
ed9eccbe DS |
1295 | ret = -EAGAIN; |
1296 | break; | |
1297 | } | |
5d06e3df | 1298 | ret = s->async->inttrig(dev, s, data[0]); |
ed9eccbe DS |
1299 | if (ret >= 0) |
1300 | ret = 1; | |
1301 | break; | |
1302 | default: | |
272850f0 | 1303 | dev_dbg(dev->class_dev, "invalid insn\n"); |
ed9eccbe DS |
1304 | ret = -EINVAL; |
1305 | break; | |
1306 | } | |
1307 | } else { | |
1308 | /* a subdevice instruction */ | |
790c5541 | 1309 | unsigned int maxdata; |
ed9eccbe DS |
1310 | |
1311 | if (insn->subdev >= dev->n_subdevices) { | |
272850f0 HS |
1312 | dev_dbg(dev->class_dev, "subdevice %d out of range\n", |
1313 | insn->subdev); | |
ed9eccbe DS |
1314 | ret = -EINVAL; |
1315 | goto out; | |
1316 | } | |
b077f2cd | 1317 | s = &dev->subdevices[insn->subdev]; |
ed9eccbe DS |
1318 | |
1319 | if (s->type == COMEDI_SUBD_UNUSED) { | |
272850f0 HS |
1320 | dev_dbg(dev->class_dev, "%d not usable subdevice\n", |
1321 | insn->subdev); | |
ed9eccbe DS |
1322 | ret = -EIO; |
1323 | goto out; | |
1324 | } | |
1325 | ||
1326 | /* are we locked? (ioctl lock) */ | |
1327 | if (s->lock && s->lock != file) { | |
272850f0 | 1328 | dev_dbg(dev->class_dev, "device locked\n"); |
ed9eccbe DS |
1329 | ret = -EACCES; |
1330 | goto out; | |
1331 | } | |
1332 | ||
0fd0ca75 | 1333 | ret = comedi_check_chanlist(s, 1, &insn->chanspec); |
476b8477 | 1334 | if (ret < 0) { |
ed9eccbe | 1335 | ret = -EINVAL; |
272850f0 | 1336 | dev_dbg(dev->class_dev, "bad chanspec\n"); |
ed9eccbe DS |
1337 | goto out; |
1338 | } | |
1339 | ||
1340 | if (s->busy) { | |
1341 | ret = -EBUSY; | |
1342 | goto out; | |
1343 | } | |
1344 | /* This looks arbitrary. It is. */ | |
30cc9bd6 | 1345 | s->busy = parse_insn; |
ed9eccbe DS |
1346 | switch (insn->insn) { |
1347 | case INSN_READ: | |
1348 | ret = s->insn_read(dev, s, insn, data); | |
22ca19d9 HS |
1349 | if (ret == -ETIMEDOUT) { |
1350 | dev_dbg(dev->class_dev, | |
1351 | "subdevice %d read instruction timed out\n", | |
1352 | s->index); | |
1353 | } | |
ed9eccbe DS |
1354 | break; |
1355 | case INSN_WRITE: | |
1356 | maxdata = s->maxdata_list | |
476b8477 GKH |
1357 | ? s->maxdata_list[CR_CHAN(insn->chanspec)] |
1358 | : s->maxdata; | |
ed9eccbe DS |
1359 | for (i = 0; i < insn->n; ++i) { |
1360 | if (data[i] > maxdata) { | |
1361 | ret = -EINVAL; | |
272850f0 HS |
1362 | dev_dbg(dev->class_dev, |
1363 | "bad data value(s)\n"); | |
ed9eccbe DS |
1364 | break; |
1365 | } | |
1366 | } | |
22ca19d9 | 1367 | if (ret == 0) { |
ed9eccbe | 1368 | ret = s->insn_write(dev, s, insn, data); |
22ca19d9 HS |
1369 | if (ret == -ETIMEDOUT) { |
1370 | dev_dbg(dev->class_dev, | |
1371 | "subdevice %d write instruction timed out\n", | |
1372 | s->index); | |
1373 | } | |
1374 | } | |
ed9eccbe DS |
1375 | break; |
1376 | case INSN_BITS: | |
1377 | if (insn->n != 2) { | |
1378 | ret = -EINVAL; | |
2f644ccf | 1379 | } else { |
a2aab8b4 IA |
1380 | /* |
1381 | * Most drivers ignore the base channel in | |
2f644ccf | 1382 | * insn->chanspec. Fix this here if |
a2aab8b4 IA |
1383 | * the subdevice has <= 32 channels. |
1384 | */ | |
36efbacd HS |
1385 | unsigned int orig_mask = data[0]; |
1386 | unsigned int shift = 0; | |
2f644ccf | 1387 | |
2f644ccf IA |
1388 | if (s->n_chan <= 32) { |
1389 | shift = CR_CHAN(insn->chanspec); | |
1390 | if (shift > 0) { | |
1391 | insn->chanspec = 0; | |
1392 | data[0] <<= shift; | |
1393 | data[1] <<= shift; | |
1394 | } | |
36efbacd | 1395 | } |
2f644ccf IA |
1396 | ret = s->insn_bits(dev, s, insn, data); |
1397 | data[0] = orig_mask; | |
1398 | if (shift > 0) | |
1399 | data[1] >>= shift; | |
ed9eccbe | 1400 | } |
ed9eccbe DS |
1401 | break; |
1402 | case INSN_CONFIG: | |
1403 | ret = check_insn_config_length(insn, data); | |
1404 | if (ret) | |
1405 | break; | |
1406 | ret = s->insn_config(dev, s, insn, data); | |
1407 | break; | |
1408 | default: | |
1409 | ret = -EINVAL; | |
1410 | break; | |
1411 | } | |
1412 | ||
1413 | s->busy = NULL; | |
1414 | } | |
1415 | ||
476b8477 | 1416 | out: |
ed9eccbe DS |
1417 | return ret; |
1418 | } | |
1419 | ||
5b6cbd87 | 1420 | /* |
18e01b24 IA |
1421 | * COMEDI_INSNLIST ioctl |
1422 | * synchronous instruction list | |
5b6cbd87 | 1423 | * |
18e01b24 IA |
1424 | * arg: |
1425 | * pointer to comedi_insnlist structure | |
5b6cbd87 | 1426 | * |
18e01b24 IA |
1427 | * reads: |
1428 | * comedi_insnlist structure | |
1429 | * array of comedi_insn structures from insnlist->insns pointer | |
1430 | * data (for writes) from insns[].data pointers | |
5b6cbd87 | 1431 | * |
18e01b24 IA |
1432 | * writes: |
1433 | * data (for reads) to insns[].data pointers | |
5b6cbd87 HS |
1434 | */ |
1435 | /* arbitrary limits */ | |
1436 | #define MAX_SAMPLES 256 | |
1437 | static int do_insnlist_ioctl(struct comedi_device *dev, | |
1438 | struct comedi_insnlist __user *arg, void *file) | |
1439 | { | |
1440 | struct comedi_insnlist insnlist; | |
1441 | struct comedi_insn *insns = NULL; | |
1442 | unsigned int *data = NULL; | |
1443 | int i = 0; | |
1444 | int ret = 0; | |
1445 | ||
1446 | if (copy_from_user(&insnlist, arg, sizeof(insnlist))) | |
1447 | return -EFAULT; | |
1448 | ||
f4a8f528 | 1449 | data = kmalloc_array(MAX_SAMPLES, sizeof(unsigned int), GFP_KERNEL); |
5b6cbd87 | 1450 | if (!data) { |
5b6cbd87 HS |
1451 | ret = -ENOMEM; |
1452 | goto error; | |
1453 | } | |
1454 | ||
1455 | insns = kcalloc(insnlist.n_insns, sizeof(*insns), GFP_KERNEL); | |
1456 | if (!insns) { | |
5b6cbd87 HS |
1457 | ret = -ENOMEM; |
1458 | goto error; | |
1459 | } | |
1460 | ||
1461 | if (copy_from_user(insns, insnlist.insns, | |
1462 | sizeof(*insns) * insnlist.n_insns)) { | |
272850f0 | 1463 | dev_dbg(dev->class_dev, "copy_from_user failed\n"); |
5b6cbd87 HS |
1464 | ret = -EFAULT; |
1465 | goto error; | |
1466 | } | |
1467 | ||
1468 | for (i = 0; i < insnlist.n_insns; i++) { | |
1469 | if (insns[i].n > MAX_SAMPLES) { | |
272850f0 HS |
1470 | dev_dbg(dev->class_dev, |
1471 | "number of samples too large\n"); | |
5b6cbd87 HS |
1472 | ret = -EINVAL; |
1473 | goto error; | |
1474 | } | |
1475 | if (insns[i].insn & INSN_MASK_WRITE) { | |
1476 | if (copy_from_user(data, insns[i].data, | |
1477 | insns[i].n * sizeof(unsigned int))) { | |
272850f0 HS |
1478 | dev_dbg(dev->class_dev, |
1479 | "copy_from_user failed\n"); | |
5b6cbd87 HS |
1480 | ret = -EFAULT; |
1481 | goto error; | |
1482 | } | |
1483 | } | |
1484 | ret = parse_insn(dev, insns + i, data, file); | |
1485 | if (ret < 0) | |
1486 | goto error; | |
1487 | if (insns[i].insn & INSN_MASK_READ) { | |
1488 | if (copy_to_user(insns[i].data, data, | |
1489 | insns[i].n * sizeof(unsigned int))) { | |
272850f0 HS |
1490 | dev_dbg(dev->class_dev, |
1491 | "copy_to_user failed\n"); | |
5b6cbd87 HS |
1492 | ret = -EFAULT; |
1493 | goto error; | |
1494 | } | |
1495 | } | |
1496 | if (need_resched()) | |
1497 | schedule(); | |
1498 | } | |
1499 | ||
1500 | error: | |
1501 | kfree(insns); | |
1502 | kfree(data); | |
1503 | ||
1504 | if (ret < 0) | |
1505 | return ret; | |
1506 | return i; | |
1507 | } | |
1508 | ||
ed9eccbe | 1509 | /* |
18e01b24 IA |
1510 | * COMEDI_INSN ioctl |
1511 | * synchronous instruction | |
ed9eccbe | 1512 | * |
18e01b24 IA |
1513 | * arg: |
1514 | * pointer to comedi_insn structure | |
ed9eccbe | 1515 | * |
18e01b24 IA |
1516 | * reads: |
1517 | * comedi_insn structure | |
1518 | * data (for writes) from insn->data pointer | |
ed9eccbe | 1519 | * |
18e01b24 IA |
1520 | * writes: |
1521 | * data (for reads) to insn->data pointer | |
ed9eccbe | 1522 | */ |
92d0127c GKH |
1523 | static int do_insn_ioctl(struct comedi_device *dev, |
1524 | struct comedi_insn __user *arg, void *file) | |
ed9eccbe | 1525 | { |
90035c08 | 1526 | struct comedi_insn insn; |
790c5541 | 1527 | unsigned int *data = NULL; |
ed9eccbe DS |
1528 | int ret = 0; |
1529 | ||
f4a8f528 | 1530 | data = kmalloc_array(MAX_SAMPLES, sizeof(unsigned int), GFP_KERNEL); |
ed9eccbe DS |
1531 | if (!data) { |
1532 | ret = -ENOMEM; | |
1533 | goto error; | |
1534 | } | |
1535 | ||
bc252fd1 | 1536 | if (copy_from_user(&insn, arg, sizeof(insn))) { |
ed9eccbe DS |
1537 | ret = -EFAULT; |
1538 | goto error; | |
1539 | } | |
1540 | ||
1541 | /* This is where the behavior of insn and insnlist deviate. */ | |
1542 | if (insn.n > MAX_SAMPLES) | |
1543 | insn.n = MAX_SAMPLES; | |
1544 | if (insn.insn & INSN_MASK_WRITE) { | |
21fe2eea M |
1545 | if (copy_from_user(data, |
1546 | insn.data, | |
1547 | insn.n * sizeof(unsigned int))) { | |
ed9eccbe DS |
1548 | ret = -EFAULT; |
1549 | goto error; | |
1550 | } | |
1551 | } | |
1552 | ret = parse_insn(dev, &insn, data, file); | |
1553 | if (ret < 0) | |
1554 | goto error; | |
1555 | if (insn.insn & INSN_MASK_READ) { | |
21fe2eea M |
1556 | if (copy_to_user(insn.data, |
1557 | data, | |
1558 | insn.n * sizeof(unsigned int))) { | |
ed9eccbe DS |
1559 | ret = -EFAULT; |
1560 | goto error; | |
1561 | } | |
1562 | } | |
1563 | ret = insn.n; | |
1564 | ||
476b8477 GKH |
1565 | error: |
1566 | kfree(data); | |
ed9eccbe DS |
1567 | |
1568 | return ret; | |
1569 | } | |
1570 | ||
87ece583 HS |
1571 | static int __comedi_get_user_cmd(struct comedi_device *dev, |
1572 | struct comedi_cmd __user *arg, | |
1573 | struct comedi_cmd *cmd) | |
ed9eccbe | 1574 | { |
34c43922 | 1575 | struct comedi_subdevice *s; |
ed9eccbe | 1576 | |
87ece583 | 1577 | if (copy_from_user(cmd, arg, sizeof(*cmd))) { |
272850f0 | 1578 | dev_dbg(dev->class_dev, "bad cmd address\n"); |
ed9eccbe DS |
1579 | return -EFAULT; |
1580 | } | |
ed9eccbe | 1581 | |
87ece583 HS |
1582 | if (cmd->subdev >= dev->n_subdevices) { |
1583 | dev_dbg(dev->class_dev, "%d no such subdevice\n", cmd->subdev); | |
ed9eccbe DS |
1584 | return -ENODEV; |
1585 | } | |
1586 | ||
87ece583 | 1587 | s = &dev->subdevices[cmd->subdev]; |
ed9eccbe DS |
1588 | |
1589 | if (s->type == COMEDI_SUBD_UNUSED) { | |
b2f48741 YD |
1590 | dev_dbg(dev->class_dev, "%d not valid subdevice\n", |
1591 | cmd->subdev); | |
ed9eccbe DS |
1592 | return -EIO; |
1593 | } | |
1594 | ||
1595 | if (!s->do_cmd || !s->do_cmdtest || !s->async) { | |
272850f0 | 1596 | dev_dbg(dev->class_dev, |
b2f48741 YD |
1597 | "subdevice %d does not support commands\n", |
1598 | cmd->subdev); | |
ed9eccbe DS |
1599 | return -EIO; |
1600 | } | |
1601 | ||
87ece583 HS |
1602 | /* make sure channel/gain list isn't too long */ |
1603 | if (cmd->chanlist_len > s->len_chanlist) { | |
1604 | dev_dbg(dev->class_dev, "channel/gain list too long %d > %d\n", | |
1605 | cmd->chanlist_len, s->len_chanlist); | |
1606 | return -EINVAL; | |
1607 | } | |
1608 | ||
5d070cf2 IA |
1609 | /* |
1610 | * Set the CMDF_WRITE flag to the correct state if the subdevice | |
1611 | * supports only "read" commands or only "write" commands. | |
1612 | */ | |
1613 | switch (s->subdev_flags & (SDF_CMD_READ | SDF_CMD_WRITE)) { | |
1614 | case SDF_CMD_READ: | |
1615 | cmd->flags &= ~CMDF_WRITE; | |
1616 | break; | |
1617 | case SDF_CMD_WRITE: | |
1618 | cmd->flags |= CMDF_WRITE; | |
1619 | break; | |
1620 | default: | |
1621 | break; | |
1622 | } | |
1623 | ||
87ece583 HS |
1624 | return 0; |
1625 | } | |
1626 | ||
c6cd0eef HS |
1627 | static int __comedi_get_user_chanlist(struct comedi_device *dev, |
1628 | struct comedi_subdevice *s, | |
1629 | unsigned int __user *user_chanlist, | |
1630 | struct comedi_cmd *cmd) | |
1631 | { | |
1632 | unsigned int *chanlist; | |
1633 | int ret; | |
1634 | ||
238b5ad8 | 1635 | cmd->chanlist = NULL; |
c6cd0eef HS |
1636 | chanlist = memdup_user(user_chanlist, |
1637 | cmd->chanlist_len * sizeof(unsigned int)); | |
1638 | if (IS_ERR(chanlist)) | |
1639 | return PTR_ERR(chanlist); | |
1640 | ||
1641 | /* make sure each element in channel/gain list is valid */ | |
1642 | ret = comedi_check_chanlist(s, cmd->chanlist_len, chanlist); | |
1643 | if (ret < 0) { | |
1644 | kfree(chanlist); | |
1645 | return ret; | |
1646 | } | |
1647 | ||
1648 | cmd->chanlist = chanlist; | |
1649 | ||
1650 | return 0; | |
1651 | } | |
1652 | ||
18e01b24 IA |
1653 | /* |
1654 | * COMEDI_CMD ioctl | |
1655 | * asynchronous acquisition command set-up | |
1656 | * | |
1657 | * arg: | |
1658 | * pointer to comedi_cmd structure | |
1659 | * | |
1660 | * reads: | |
1661 | * comedi_cmd structure | |
1662 | * channel/range list from cmd->chanlist pointer | |
1663 | * | |
1664 | * writes: | |
1665 | * possibly modified comedi_cmd structure (when -EAGAIN returned) | |
1666 | */ | |
87ece583 HS |
1667 | static int do_cmd_ioctl(struct comedi_device *dev, |
1668 | struct comedi_cmd __user *arg, void *file) | |
1669 | { | |
1670 | struct comedi_cmd cmd; | |
1671 | struct comedi_subdevice *s; | |
1672 | struct comedi_async *async; | |
1673 | unsigned int __user *user_chanlist; | |
1674 | int ret; | |
1675 | ||
1676 | /* get the user's cmd and do some simple validation */ | |
1677 | ret = __comedi_get_user_cmd(dev, arg, &cmd); | |
1678 | if (ret) | |
1679 | return ret; | |
1680 | ||
1681 | /* save user's chanlist pointer so it can be restored later */ | |
1682 | user_chanlist = (unsigned int __user *)cmd.chanlist; | |
1683 | ||
1684 | s = &dev->subdevices[cmd.subdev]; | |
1685 | async = s->async; | |
1686 | ||
ed9eccbe DS |
1687 | /* are we locked? (ioctl lock) */ |
1688 | if (s->lock && s->lock != file) { | |
272850f0 | 1689 | dev_dbg(dev->class_dev, "subdevice locked\n"); |
ed9eccbe DS |
1690 | return -EACCES; |
1691 | } | |
1692 | ||
1693 | /* are we busy? */ | |
1694 | if (s->busy) { | |
272850f0 | 1695 | dev_dbg(dev->class_dev, "subdevice busy\n"); |
ed9eccbe DS |
1696 | return -EBUSY; |
1697 | } | |
ed9eccbe | 1698 | |
ed9eccbe | 1699 | /* make sure channel/gain list isn't too short */ |
88bc0574 | 1700 | if (cmd.chanlist_len < 1) { |
272850f0 | 1701 | dev_dbg(dev->class_dev, "channel/gain list too short %u < 1\n", |
88bc0574 | 1702 | cmd.chanlist_len); |
4b18f08b | 1703 | return -EINVAL; |
ed9eccbe DS |
1704 | } |
1705 | ||
88bc0574 | 1706 | async->cmd = cmd; |
ed9eccbe | 1707 | async->cmd.data = NULL; |
ed9eccbe | 1708 | |
c6cd0eef HS |
1709 | /* load channel/gain list */ |
1710 | ret = __comedi_get_user_chanlist(dev, s, user_chanlist, &async->cmd); | |
1711 | if (ret) | |
ed9eccbe | 1712 | goto cleanup; |
ed9eccbe DS |
1713 | |
1714 | ret = s->do_cmdtest(dev, s, &async->cmd); | |
1715 | ||
b0446a21 | 1716 | if (async->cmd.flags & CMDF_BOGUS || ret) { |
272850f0 | 1717 | dev_dbg(dev->class_dev, "test returned %d\n", ret); |
88bc0574 | 1718 | cmd = async->cmd; |
476b8477 | 1719 | /* restore chanlist pointer before copying back */ |
95bc359f | 1720 | cmd.chanlist = (unsigned int __force *)user_chanlist; |
88bc0574 | 1721 | cmd.data = NULL; |
bc252fd1 | 1722 | if (copy_to_user(arg, &cmd, sizeof(cmd))) { |
272850f0 | 1723 | dev_dbg(dev->class_dev, "fault writing cmd\n"); |
ed9eccbe DS |
1724 | ret = -EFAULT; |
1725 | goto cleanup; | |
1726 | } | |
1727 | ret = -EAGAIN; | |
1728 | goto cleanup; | |
1729 | } | |
1730 | ||
1731 | if (!async->prealloc_bufsz) { | |
1732 | ret = -ENOMEM; | |
272850f0 | 1733 | dev_dbg(dev->class_dev, "no buffer (?)\n"); |
ed9eccbe DS |
1734 | goto cleanup; |
1735 | } | |
1736 | ||
fcc18a9a | 1737 | comedi_buf_reset(s); |
ed9eccbe | 1738 | |
781f933c | 1739 | async->cb_mask = COMEDI_CB_BLOCK | COMEDI_CB_CANCEL_MASK; |
d8bff6e3 | 1740 | if (async->cmd.flags & CMDF_WAKE_EOS) |
ed9eccbe | 1741 | async->cb_mask |= COMEDI_CB_EOS; |
ed9eccbe | 1742 | |
cc64ea42 IA |
1743 | comedi_update_subdevice_runflags(s, COMEDI_SRF_BUSY_MASK, |
1744 | COMEDI_SRF_RUNNING); | |
ed9eccbe | 1745 | |
84bb0bcc HS |
1746 | /* |
1747 | * Set s->busy _after_ setting COMEDI_SRF_RUNNING flag to avoid | |
1748 | * race with comedi_read() or comedi_write(). | |
1749 | */ | |
4b18f08b | 1750 | s->busy = file; |
ed9eccbe DS |
1751 | ret = s->do_cmd(dev, s); |
1752 | if (ret == 0) | |
1753 | return 0; | |
1754 | ||
476b8477 | 1755 | cleanup: |
ed9eccbe DS |
1756 | do_become_nonbusy(dev, s); |
1757 | ||
1758 | return ret; | |
1759 | } | |
1760 | ||
1761 | /* | |
18e01b24 | 1762 | * COMEDI_CMDTEST ioctl |
69e98df7 | 1763 | * asynchronous acquisition command testing |
18e01b24 IA |
1764 | * |
1765 | * arg: | |
1766 | * pointer to comedi_cmd structure | |
1767 | * | |
1768 | * reads: | |
1769 | * comedi_cmd structure | |
1770 | * channel/range list from cmd->chanlist pointer | |
1771 | * | |
1772 | * writes: | |
1773 | * possibly modified comedi_cmd structure | |
1774 | */ | |
92d0127c GKH |
1775 | static int do_cmdtest_ioctl(struct comedi_device *dev, |
1776 | struct comedi_cmd __user *arg, void *file) | |
ed9eccbe | 1777 | { |
f8348677 | 1778 | struct comedi_cmd cmd; |
34c43922 | 1779 | struct comedi_subdevice *s; |
95bc359f | 1780 | unsigned int __user *user_chanlist; |
87ece583 HS |
1781 | int ret; |
1782 | ||
1783 | /* get the user's cmd and do some simple validation */ | |
1784 | ret = __comedi_get_user_cmd(dev, arg, &cmd); | |
1785 | if (ret) | |
1786 | return ret; | |
ed9eccbe | 1787 | |
476b8477 | 1788 | /* save user's chanlist pointer so it can be restored later */ |
95bc359f | 1789 | user_chanlist = (unsigned int __user *)cmd.chanlist; |
ed9eccbe | 1790 | |
f8348677 | 1791 | s = &dev->subdevices[cmd.subdev]; |
ed9eccbe | 1792 | |
6cab7a37 IA |
1793 | /* user_chanlist can be NULL for COMEDI_CMDTEST ioctl */ |
1794 | if (user_chanlist) { | |
1795 | /* load channel/gain list */ | |
1796 | ret = __comedi_get_user_chanlist(dev, s, user_chanlist, &cmd); | |
1797 | if (ret) | |
1798 | return ret; | |
1799 | } | |
ed9eccbe | 1800 | |
f8348677 | 1801 | ret = s->do_cmdtest(dev, s, &cmd); |
ed9eccbe | 1802 | |
238b5ad8 IA |
1803 | kfree(cmd.chanlist); /* free kernel copy of user chanlist */ |
1804 | ||
476b8477 | 1805 | /* restore chanlist pointer before copying back */ |
95bc359f | 1806 | cmd.chanlist = (unsigned int __force *)user_chanlist; |
ed9eccbe | 1807 | |
bc252fd1 | 1808 | if (copy_to_user(arg, &cmd, sizeof(cmd))) { |
272850f0 | 1809 | dev_dbg(dev->class_dev, "bad cmd address\n"); |
ed9eccbe | 1810 | ret = -EFAULT; |
ed9eccbe | 1811 | } |
c6cd0eef | 1812 | |
ed9eccbe DS |
1813 | return ret; |
1814 | } | |
1815 | ||
1816 | /* | |
18e01b24 IA |
1817 | * COMEDI_LOCK ioctl |
1818 | * lock subdevice | |
1819 | * | |
1820 | * arg: | |
1821 | * subdevice number | |
1822 | * | |
1823 | * reads: | |
1824 | * nothing | |
1825 | * | |
1826 | * writes: | |
1827 | * nothing | |
1828 | */ | |
c1a6eac1 | 1829 | static int do_lock_ioctl(struct comedi_device *dev, unsigned long arg, |
0a85b6f0 | 1830 | void *file) |
ed9eccbe DS |
1831 | { |
1832 | int ret = 0; | |
1833 | unsigned long flags; | |
34c43922 | 1834 | struct comedi_subdevice *s; |
ed9eccbe DS |
1835 | |
1836 | if (arg >= dev->n_subdevices) | |
1837 | return -EINVAL; | |
b077f2cd | 1838 | s = &dev->subdevices[arg]; |
ed9eccbe | 1839 | |
5f74ea14 | 1840 | spin_lock_irqsave(&s->spin_lock, flags); |
476b8477 | 1841 | if (s->busy || s->lock) |
ed9eccbe | 1842 | ret = -EBUSY; |
476b8477 | 1843 | else |
ed9eccbe | 1844 | s->lock = file; |
5f74ea14 | 1845 | spin_unlock_irqrestore(&s->spin_lock, flags); |
ed9eccbe | 1846 | |
ed9eccbe DS |
1847 | return ret; |
1848 | } | |
1849 | ||
1850 | /* | |
18e01b24 IA |
1851 | * COMEDI_UNLOCK ioctl |
1852 | * unlock subdevice | |
1853 | * | |
1854 | * arg: | |
1855 | * subdevice number | |
1856 | * | |
1857 | * reads: | |
1858 | * nothing | |
1859 | * | |
1860 | * writes: | |
1861 | * nothing | |
1862 | */ | |
c1a6eac1 | 1863 | static int do_unlock_ioctl(struct comedi_device *dev, unsigned long arg, |
0a85b6f0 | 1864 | void *file) |
ed9eccbe | 1865 | { |
34c43922 | 1866 | struct comedi_subdevice *s; |
ed9eccbe DS |
1867 | |
1868 | if (arg >= dev->n_subdevices) | |
1869 | return -EINVAL; | |
b077f2cd | 1870 | s = &dev->subdevices[arg]; |
ed9eccbe DS |
1871 | |
1872 | if (s->busy) | |
1873 | return -EBUSY; | |
1874 | ||
1875 | if (s->lock && s->lock != file) | |
1876 | return -EACCES; | |
1877 | ||
90ac0764 | 1878 | if (s->lock == file) |
ed9eccbe | 1879 | s->lock = NULL; |
ed9eccbe DS |
1880 | |
1881 | return 0; | |
1882 | } | |
1883 | ||
1884 | /* | |
18e01b24 IA |
1885 | * COMEDI_CANCEL ioctl |
1886 | * cancel asynchronous acquisition | |
1887 | * | |
1888 | * arg: | |
1889 | * subdevice number | |
1890 | * | |
1891 | * reads: | |
1892 | * nothing | |
1893 | * | |
1894 | * writes: | |
1895 | * nothing | |
1896 | */ | |
c1a6eac1 | 1897 | static int do_cancel_ioctl(struct comedi_device *dev, unsigned long arg, |
0a85b6f0 | 1898 | void *file) |
ed9eccbe | 1899 | { |
34c43922 | 1900 | struct comedi_subdevice *s; |
ed9eccbe DS |
1901 | |
1902 | if (arg >= dev->n_subdevices) | |
1903 | return -EINVAL; | |
b077f2cd | 1904 | s = &dev->subdevices[arg]; |
88cc30cf | 1905 | if (!s->async) |
ed9eccbe DS |
1906 | return -EINVAL; |
1907 | ||
ed9eccbe DS |
1908 | if (!s->busy) |
1909 | return 0; | |
1910 | ||
1911 | if (s->busy != file) | |
1912 | return -EBUSY; | |
1913 | ||
fe43ec53 | 1914 | return do_cancel(dev, s); |
ed9eccbe DS |
1915 | } |
1916 | ||
1917 | /* | |
18e01b24 IA |
1918 | * COMEDI_POLL ioctl |
1919 | * instructs driver to synchronize buffers | |
1920 | * | |
1921 | * arg: | |
1922 | * subdevice number | |
1923 | * | |
1924 | * reads: | |
1925 | * nothing | |
1926 | * | |
1927 | * writes: | |
1928 | * nothing | |
1929 | */ | |
c1a6eac1 | 1930 | static int do_poll_ioctl(struct comedi_device *dev, unsigned long arg, |
0a85b6f0 | 1931 | void *file) |
ed9eccbe | 1932 | { |
34c43922 | 1933 | struct comedi_subdevice *s; |
ed9eccbe DS |
1934 | |
1935 | if (arg >= dev->n_subdevices) | |
1936 | return -EINVAL; | |
b077f2cd | 1937 | s = &dev->subdevices[arg]; |
ed9eccbe | 1938 | |
ed9eccbe DS |
1939 | if (!s->busy) |
1940 | return 0; | |
1941 | ||
1942 | if (s->busy != file) | |
1943 | return -EBUSY; | |
1944 | ||
1945 | if (s->poll) | |
1946 | return s->poll(dev, s); | |
1947 | ||
1948 | return -EINVAL; | |
1949 | } | |
1950 | ||
c299a678 IA |
1951 | /* |
1952 | * COMEDI_SETRSUBD ioctl | |
1953 | * sets the current "read" subdevice on a per-file basis | |
1954 | * | |
1955 | * arg: | |
1956 | * subdevice number | |
1957 | * | |
1958 | * reads: | |
1959 | * nothing | |
1960 | * | |
1961 | * writes: | |
1962 | * nothing | |
1963 | */ | |
1964 | static int do_setrsubd_ioctl(struct comedi_device *dev, unsigned long arg, | |
1965 | struct file *file) | |
1966 | { | |
1967 | struct comedi_file *cfp = file->private_data; | |
1968 | struct comedi_subdevice *s_old, *s_new; | |
1969 | ||
1970 | if (arg >= dev->n_subdevices) | |
1971 | return -EINVAL; | |
1972 | ||
1973 | s_new = &dev->subdevices[arg]; | |
1974 | s_old = comedi_file_read_subdevice(file); | |
1975 | if (s_old == s_new) | |
1976 | return 0; /* no change */ | |
1977 | ||
1978 | if (!(s_new->subdev_flags & SDF_CMD_READ)) | |
1979 | return -EINVAL; | |
1980 | ||
1981 | /* | |
1982 | * Check the file isn't still busy handling a "read" command on the | |
1983 | * old subdevice (if any). | |
1984 | */ | |
1985 | if (s_old && s_old->busy == file && s_old->async && | |
1986 | !(s_old->async->cmd.flags & CMDF_WRITE)) | |
1987 | return -EBUSY; | |
1988 | ||
1989 | ACCESS_ONCE(cfp->read_subdev) = s_new; | |
1990 | return 0; | |
1991 | } | |
1992 | ||
1993 | /* | |
1994 | * COMEDI_SETWSUBD ioctl | |
1995 | * sets the current "write" subdevice on a per-file basis | |
1996 | * | |
1997 | * arg: | |
1998 | * subdevice number | |
1999 | * | |
2000 | * reads: | |
2001 | * nothing | |
2002 | * | |
2003 | * writes: | |
2004 | * nothing | |
2005 | */ | |
2006 | static int do_setwsubd_ioctl(struct comedi_device *dev, unsigned long arg, | |
2007 | struct file *file) | |
2008 | { | |
2009 | struct comedi_file *cfp = file->private_data; | |
2010 | struct comedi_subdevice *s_old, *s_new; | |
2011 | ||
2012 | if (arg >= dev->n_subdevices) | |
2013 | return -EINVAL; | |
2014 | ||
2015 | s_new = &dev->subdevices[arg]; | |
2016 | s_old = comedi_file_write_subdevice(file); | |
2017 | if (s_old == s_new) | |
2018 | return 0; /* no change */ | |
2019 | ||
2020 | if (!(s_new->subdev_flags & SDF_CMD_WRITE)) | |
2021 | return -EINVAL; | |
2022 | ||
2023 | /* | |
2024 | * Check the file isn't still busy handling a "write" command on the | |
2025 | * old subdevice (if any). | |
2026 | */ | |
2027 | if (s_old && s_old->busy == file && s_old->async && | |
2028 | (s_old->async->cmd.flags & CMDF_WRITE)) | |
2029 | return -EBUSY; | |
2030 | ||
2031 | ACCESS_ONCE(cfp->write_subdev) = s_new; | |
2032 | return 0; | |
2033 | } | |
2034 | ||
47db6d58 HS |
2035 | static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd, |
2036 | unsigned long arg) | |
2037 | { | |
20f083c0 IA |
2038 | unsigned minor = iminor(file_inode(file)); |
2039 | struct comedi_file *cfp = file->private_data; | |
2040 | struct comedi_device *dev = cfp->dev; | |
47db6d58 HS |
2041 | int rc; |
2042 | ||
47db6d58 HS |
2043 | mutex_lock(&dev->mutex); |
2044 | ||
a2aab8b4 IA |
2045 | /* |
2046 | * Device config is special, because it must work on | |
2047 | * an unconfigured device. | |
2048 | */ | |
47db6d58 | 2049 | if (cmd == COMEDI_DEVCONFIG) { |
754ab5c0 IA |
2050 | if (minor >= COMEDI_NUM_BOARD_MINORS) { |
2051 | /* Device config not appropriate on non-board minors. */ | |
2052 | rc = -ENOTTY; | |
2053 | goto done; | |
2054 | } | |
47db6d58 HS |
2055 | rc = do_devconfig_ioctl(dev, |
2056 | (struct comedi_devconfig __user *)arg); | |
8ab4ed6e IA |
2057 | if (rc == 0) { |
2058 | if (arg == 0 && | |
2059 | dev->minor >= comedi_num_legacy_minors) { | |
a2aab8b4 IA |
2060 | /* |
2061 | * Successfully unconfigured a dynamically | |
2062 | * allocated device. Try and remove it. | |
2063 | */ | |
db210da2 | 2064 | if (comedi_clear_board_dev(dev)) { |
8ab4ed6e | 2065 | mutex_unlock(&dev->mutex); |
cb6b79de | 2066 | comedi_free_board_dev(dev); |
8ab4ed6e IA |
2067 | return rc; |
2068 | } | |
2069 | } | |
2070 | } | |
47db6d58 HS |
2071 | goto done; |
2072 | } | |
2073 | ||
2074 | if (!dev->attached) { | |
272850f0 | 2075 | dev_dbg(dev->class_dev, "no driver attached\n"); |
47db6d58 HS |
2076 | rc = -ENODEV; |
2077 | goto done; | |
2078 | } | |
2079 | ||
2080 | switch (cmd) { | |
2081 | case COMEDI_BUFCONFIG: | |
2082 | rc = do_bufconfig_ioctl(dev, | |
2083 | (struct comedi_bufconfig __user *)arg); | |
2084 | break; | |
2085 | case COMEDI_DEVINFO: | |
2086 | rc = do_devinfo_ioctl(dev, (struct comedi_devinfo __user *)arg, | |
2087 | file); | |
2088 | break; | |
2089 | case COMEDI_SUBDINFO: | |
2090 | rc = do_subdinfo_ioctl(dev, | |
2091 | (struct comedi_subdinfo __user *)arg, | |
2092 | file); | |
2093 | break; | |
2094 | case COMEDI_CHANINFO: | |
2095 | rc = do_chaninfo_ioctl(dev, (void __user *)arg); | |
2096 | break; | |
2097 | case COMEDI_RANGEINFO: | |
2098 | rc = do_rangeinfo_ioctl(dev, (void __user *)arg); | |
2099 | break; | |
2100 | case COMEDI_BUFINFO: | |
2101 | rc = do_bufinfo_ioctl(dev, | |
2102 | (struct comedi_bufinfo __user *)arg, | |
2103 | file); | |
2104 | break; | |
2105 | case COMEDI_LOCK: | |
2106 | rc = do_lock_ioctl(dev, arg, file); | |
2107 | break; | |
2108 | case COMEDI_UNLOCK: | |
2109 | rc = do_unlock_ioctl(dev, arg, file); | |
2110 | break; | |
2111 | case COMEDI_CANCEL: | |
2112 | rc = do_cancel_ioctl(dev, arg, file); | |
2113 | break; | |
2114 | case COMEDI_CMD: | |
2115 | rc = do_cmd_ioctl(dev, (struct comedi_cmd __user *)arg, file); | |
2116 | break; | |
2117 | case COMEDI_CMDTEST: | |
2118 | rc = do_cmdtest_ioctl(dev, (struct comedi_cmd __user *)arg, | |
2119 | file); | |
2120 | break; | |
2121 | case COMEDI_INSNLIST: | |
2122 | rc = do_insnlist_ioctl(dev, | |
2123 | (struct comedi_insnlist __user *)arg, | |
2124 | file); | |
2125 | break; | |
2126 | case COMEDI_INSN: | |
2127 | rc = do_insn_ioctl(dev, (struct comedi_insn __user *)arg, | |
2128 | file); | |
2129 | break; | |
2130 | case COMEDI_POLL: | |
2131 | rc = do_poll_ioctl(dev, arg, file); | |
2132 | break; | |
c299a678 IA |
2133 | case COMEDI_SETRSUBD: |
2134 | rc = do_setrsubd_ioctl(dev, arg, file); | |
2135 | break; | |
2136 | case COMEDI_SETWSUBD: | |
2137 | rc = do_setwsubd_ioctl(dev, arg, file); | |
2138 | break; | |
47db6d58 HS |
2139 | default: |
2140 | rc = -ENOTTY; | |
2141 | break; | |
2142 | } | |
2143 | ||
2144 | done: | |
2145 | mutex_unlock(&dev->mutex); | |
2146 | return rc; | |
2147 | } | |
2148 | ||
df30b21c FV |
2149 | static void comedi_vm_open(struct vm_area_struct *area) |
2150 | { | |
af93da31 | 2151 | struct comedi_buf_map *bm; |
df30b21c | 2152 | |
af93da31 IA |
2153 | bm = area->vm_private_data; |
2154 | comedi_buf_map_get(bm); | |
df30b21c FV |
2155 | } |
2156 | ||
2157 | static void comedi_vm_close(struct vm_area_struct *area) | |
ed9eccbe | 2158 | { |
af93da31 | 2159 | struct comedi_buf_map *bm; |
ed9eccbe | 2160 | |
af93da31 IA |
2161 | bm = area->vm_private_data; |
2162 | comedi_buf_map_put(bm); | |
ed9eccbe DS |
2163 | } |
2164 | ||
7cbea8dc | 2165 | static const struct vm_operations_struct comedi_vm_ops = { |
df30b21c FV |
2166 | .open = comedi_vm_open, |
2167 | .close = comedi_vm_close, | |
ed9eccbe DS |
2168 | }; |
2169 | ||
2170 | static int comedi_mmap(struct file *file, struct vm_area_struct *vma) | |
2171 | { | |
20f083c0 IA |
2172 | struct comedi_file *cfp = file->private_data; |
2173 | struct comedi_device *dev = cfp->dev; | |
a52840a9 HS |
2174 | struct comedi_subdevice *s; |
2175 | struct comedi_async *async; | |
b34aa86f | 2176 | struct comedi_buf_map *bm = NULL; |
ed9eccbe DS |
2177 | unsigned long start = vma->vm_start; |
2178 | unsigned long size; | |
2179 | int n_pages; | |
2180 | int i; | |
2181 | int retval; | |
3ffab428 | 2182 | |
b34aa86f IA |
2183 | /* |
2184 | * 'trylock' avoids circular dependency with current->mm->mmap_sem | |
2185 | * and down-reading &dev->attach_lock should normally succeed without | |
2186 | * contention unless the device is in the process of being attached | |
2187 | * or detached. | |
2188 | */ | |
2189 | if (!down_read_trylock(&dev->attach_lock)) | |
2190 | return -EAGAIN; | |
a52840a9 | 2191 | |
ed9eccbe | 2192 | if (!dev->attached) { |
272850f0 | 2193 | dev_dbg(dev->class_dev, "no driver attached\n"); |
ed9eccbe DS |
2194 | retval = -ENODEV; |
2195 | goto done; | |
2196 | } | |
a52840a9 | 2197 | |
476b8477 | 2198 | if (vma->vm_flags & VM_WRITE) |
20f083c0 | 2199 | s = comedi_file_write_subdevice(file); |
476b8477 | 2200 | else |
20f083c0 | 2201 | s = comedi_file_read_subdevice(file); |
a52840a9 | 2202 | if (!s) { |
ed9eccbe DS |
2203 | retval = -EINVAL; |
2204 | goto done; | |
2205 | } | |
a52840a9 | 2206 | |
ed9eccbe | 2207 | async = s->async; |
a52840a9 | 2208 | if (!async) { |
ed9eccbe DS |
2209 | retval = -EINVAL; |
2210 | goto done; | |
2211 | } | |
2212 | ||
2213 | if (vma->vm_pgoff != 0) { | |
272850f0 | 2214 | dev_dbg(dev->class_dev, "mmap() offset must be 0.\n"); |
ed9eccbe DS |
2215 | retval = -EINVAL; |
2216 | goto done; | |
2217 | } | |
2218 | ||
2219 | size = vma->vm_end - vma->vm_start; | |
2220 | if (size > async->prealloc_bufsz) { | |
2221 | retval = -EFAULT; | |
2222 | goto done; | |
2223 | } | |
2224 | if (size & (~PAGE_MASK)) { | |
2225 | retval = -EFAULT; | |
2226 | goto done; | |
2227 | } | |
2228 | ||
2229 | n_pages = size >> PAGE_SHIFT; | |
b34aa86f IA |
2230 | |
2231 | /* get reference to current buf map (if any) */ | |
2232 | bm = comedi_buf_map_from_subdev_get(s); | |
af93da31 IA |
2233 | if (!bm || n_pages > bm->n_pages) { |
2234 | retval = -EINVAL; | |
2235 | goto done; | |
2236 | } | |
ed9eccbe | 2237 | for (i = 0; i < n_pages; ++i) { |
af93da31 | 2238 | struct comedi_buf_page *buf = &bm->page_list[i]; |
a52840a9 | 2239 | |
ed9eccbe | 2240 | if (remap_pfn_range(vma, start, |
a52840a9 HS |
2241 | page_to_pfn(virt_to_page(buf->virt_addr)), |
2242 | PAGE_SIZE, PAGE_SHARED)) { | |
ed9eccbe DS |
2243 | retval = -EAGAIN; |
2244 | goto done; | |
2245 | } | |
2246 | start += PAGE_SIZE; | |
2247 | } | |
2248 | ||
2249 | vma->vm_ops = &comedi_vm_ops; | |
af93da31 | 2250 | vma->vm_private_data = bm; |
ed9eccbe | 2251 | |
af93da31 | 2252 | vma->vm_ops->open(vma); |
ed9eccbe DS |
2253 | |
2254 | retval = 0; | |
476b8477 | 2255 | done: |
b34aa86f IA |
2256 | up_read(&dev->attach_lock); |
2257 | comedi_buf_map_put(bm); /* put reference to buf map - okay if NULL */ | |
ed9eccbe DS |
2258 | return retval; |
2259 | } | |
2260 | ||
1ae5062a | 2261 | static unsigned int comedi_poll(struct file *file, poll_table *wait) |
ed9eccbe DS |
2262 | { |
2263 | unsigned int mask = 0; | |
20f083c0 IA |
2264 | struct comedi_file *cfp = file->private_data; |
2265 | struct comedi_device *dev = cfp->dev; | |
322146d5 | 2266 | struct comedi_subdevice *s, *s_read; |
3ffab428 | 2267 | |
d5eb3a74 | 2268 | down_read(&dev->attach_lock); |
ca081b1d | 2269 | |
ed9eccbe | 2270 | if (!dev->attached) { |
272850f0 | 2271 | dev_dbg(dev->class_dev, "no driver attached\n"); |
ca081b1d | 2272 | goto done; |
ed9eccbe DS |
2273 | } |
2274 | ||
20f083c0 | 2275 | s = comedi_file_read_subdevice(file); |
322146d5 | 2276 | s_read = s; |
cc400e18 | 2277 | if (s && s->async) { |
ca081b1d | 2278 | poll_wait(file, &s->async->wait_head, wait); |
3834234f | 2279 | if (s->busy != file || !comedi_is_subdevice_running(s) || |
662c722b | 2280 | (s->async->cmd.flags & CMDF_WRITE) || |
e9edef3a | 2281 | comedi_buf_read_n_available(s) > 0) |
ed9eccbe | 2282 | mask |= POLLIN | POLLRDNORM; |
ed9eccbe | 2283 | } |
ca081b1d | 2284 | |
20f083c0 | 2285 | s = comedi_file_write_subdevice(file); |
cc400e18 | 2286 | if (s && s->async) { |
c39e050d | 2287 | unsigned int bps = comedi_bytes_per_sample(s); |
ca081b1d | 2288 | |
322146d5 IA |
2289 | if (s != s_read) |
2290 | poll_wait(file, &s->async->wait_head, wait); | |
3834234f | 2291 | if (s->busy != file || !comedi_is_subdevice_running(s) || |
662c722b | 2292 | !(s->async->cmd.flags & CMDF_WRITE) || |
ecf04ed3 | 2293 | comedi_buf_write_n_available(s) >= bps) |
ed9eccbe | 2294 | mask |= POLLOUT | POLLWRNORM; |
ed9eccbe DS |
2295 | } |
2296 | ||
ca081b1d | 2297 | done: |
d5eb3a74 | 2298 | up_read(&dev->attach_lock); |
ed9eccbe DS |
2299 | return mask; |
2300 | } | |
2301 | ||
92d0127c GKH |
2302 | static ssize_t comedi_write(struct file *file, const char __user *buf, |
2303 | size_t nbytes, loff_t *offset) | |
ed9eccbe | 2304 | { |
34c43922 | 2305 | struct comedi_subdevice *s; |
d163679c | 2306 | struct comedi_async *async; |
84a185ec IA |
2307 | unsigned int n, m; |
2308 | ssize_t count = 0; | |
2309 | int retval = 0; | |
ed9eccbe | 2310 | DECLARE_WAITQUEUE(wait, current); |
20f083c0 IA |
2311 | struct comedi_file *cfp = file->private_data; |
2312 | struct comedi_device *dev = cfp->dev; | |
06181de1 | 2313 | bool become_nonbusy = false; |
9329f139 IA |
2314 | bool attach_locked; |
2315 | unsigned int old_detach_count; | |
3ffab428 | 2316 | |
9329f139 IA |
2317 | /* Protect against device detachment during operation. */ |
2318 | down_read(&dev->attach_lock); | |
2319 | attach_locked = true; | |
2320 | old_detach_count = dev->detach_count; | |
2321 | ||
ed9eccbe | 2322 | if (!dev->attached) { |
272850f0 | 2323 | dev_dbg(dev->class_dev, "no driver attached\n"); |
9329f139 IA |
2324 | retval = -ENODEV; |
2325 | goto out; | |
ed9eccbe DS |
2326 | } |
2327 | ||
20f083c0 | 2328 | s = comedi_file_write_subdevice(file); |
9329f139 IA |
2329 | if (!s || !s->async) { |
2330 | retval = -EIO; | |
2331 | goto out; | |
2332 | } | |
2714b019 | 2333 | |
ed9eccbe | 2334 | async = s->async; |
3318c7ad | 2335 | if (s->busy != file || !(async->cmd.flags & CMDF_WRITE)) { |
f7398509 IA |
2336 | retval = -EINVAL; |
2337 | goto out; | |
2338 | } | |
2714b019 | 2339 | |
ed9eccbe | 2340 | add_wait_queue(&async->wait_head, &wait); |
06181de1 | 2341 | while (count == 0 && !retval) { |
b183a836 | 2342 | unsigned runflags; |
35a7475d | 2343 | unsigned int wp, n1, n2; |
b183a836 | 2344 | |
ed9eccbe DS |
2345 | set_current_state(TASK_INTERRUPTIBLE); |
2346 | ||
b183a836 IA |
2347 | runflags = comedi_get_subdevice_runflags(s); |
2348 | if (!comedi_is_runflags_running(runflags)) { | |
06181de1 IA |
2349 | if (comedi_is_runflags_in_error(runflags)) |
2350 | retval = -EPIPE; | |
28a60c45 IA |
2351 | if (retval || nbytes) |
2352 | become_nonbusy = true; | |
d2611540 IA |
2353 | break; |
2354 | } | |
28a60c45 IA |
2355 | if (nbytes == 0) |
2356 | break; | |
d2611540 | 2357 | |
591c5f8a IA |
2358 | /* Allocate all free buffer space. */ |
2359 | comedi_buf_write_alloc(s, async->prealloc_bufsz); | |
2360 | m = comedi_buf_write_n_allocated(s); | |
591c5f8a | 2361 | n = min_t(size_t, m, nbytes); |
ed9eccbe DS |
2362 | |
2363 | if (n == 0) { | |
ed9eccbe DS |
2364 | if (file->f_flags & O_NONBLOCK) { |
2365 | retval = -EAGAIN; | |
2366 | break; | |
2367 | } | |
6a9ce6b6 | 2368 | schedule(); |
ed9eccbe DS |
2369 | if (signal_pending(current)) { |
2370 | retval = -ERESTARTSYS; | |
2371 | break; | |
2372 | } | |
3318c7ad IA |
2373 | if (s->busy != file || |
2374 | !(async->cmd.flags & CMDF_WRITE)) { | |
f7398509 IA |
2375 | retval = -EINVAL; |
2376 | break; | |
2377 | } | |
ed9eccbe DS |
2378 | continue; |
2379 | } | |
2380 | ||
35a7475d IA |
2381 | wp = async->buf_write_ptr; |
2382 | n1 = min(n, async->prealloc_bufsz - wp); | |
2383 | n2 = n - n1; | |
2384 | m = copy_from_user(async->prealloc_buf + wp, buf, n1); | |
2385 | if (m) | |
2386 | m += n2; | |
2387 | else if (n2) | |
2388 | m = copy_from_user(async->prealloc_buf, buf + n1, n2); | |
ed9eccbe DS |
2389 | if (m) { |
2390 | n -= m; | |
2391 | retval = -EFAULT; | |
2392 | } | |
940dd35d | 2393 | comedi_buf_write_free(s, n); |
ed9eccbe DS |
2394 | |
2395 | count += n; | |
2396 | nbytes -= n; | |
2397 | ||
2398 | buf += n; | |
ed9eccbe | 2399 | } |
06181de1 | 2400 | remove_wait_queue(&async->wait_head, &wait); |
ed9eccbe | 2401 | set_current_state(TASK_RUNNING); |
06181de1 IA |
2402 | if (become_nonbusy && count == 0) { |
2403 | struct comedi_subdevice *new_s; | |
2404 | ||
2405 | /* | |
2406 | * To avoid deadlock, cannot acquire dev->mutex | |
2407 | * while dev->attach_lock is held. | |
2408 | */ | |
2409 | up_read(&dev->attach_lock); | |
2410 | attach_locked = false; | |
2411 | mutex_lock(&dev->mutex); | |
2412 | /* | |
2413 | * Check device hasn't become detached behind our back. | |
2414 | * Checking dev->detach_count is unchanged ought to be | |
2415 | * sufficient (unless there have been 2**32 detaches in the | |
2416 | * meantime!), but check the subdevice pointer as well just in | |
2417 | * case. | |
ed65bba3 IA |
2418 | * |
2419 | * Also check the subdevice is still in a suitable state to | |
2420 | * become non-busy in case it changed behind our back. | |
06181de1 IA |
2421 | */ |
2422 | new_s = comedi_file_write_subdevice(file); | |
2423 | if (dev->attached && old_detach_count == dev->detach_count && | |
ed65bba3 IA |
2424 | s == new_s && new_s->async == async && s->busy == file && |
2425 | (async->cmd.flags & CMDF_WRITE) && | |
2426 | !comedi_is_subdevice_running(s)) | |
06181de1 IA |
2427 | do_become_nonbusy(dev, s); |
2428 | mutex_unlock(&dev->mutex); | |
2429 | } | |
2430 | out: | |
9329f139 IA |
2431 | if (attach_locked) |
2432 | up_read(&dev->attach_lock); | |
ed9eccbe | 2433 | |
476b8477 | 2434 | return count ? count : retval; |
ed9eccbe DS |
2435 | } |
2436 | ||
92d0127c | 2437 | static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes, |
36efbacd | 2438 | loff_t *offset) |
ed9eccbe | 2439 | { |
34c43922 | 2440 | struct comedi_subdevice *s; |
d163679c | 2441 | struct comedi_async *async; |
76e8e7d4 IA |
2442 | unsigned int n, m; |
2443 | ssize_t count = 0; | |
2444 | int retval = 0; | |
ed9eccbe | 2445 | DECLARE_WAITQUEUE(wait, current); |
20f083c0 IA |
2446 | struct comedi_file *cfp = file->private_data; |
2447 | struct comedi_device *dev = cfp->dev; | |
45c2bc55 IA |
2448 | unsigned int old_detach_count; |
2449 | bool become_nonbusy = false; | |
2450 | bool attach_locked; | |
3ffab428 | 2451 | |
45c2bc55 IA |
2452 | /* Protect against device detachment during operation. */ |
2453 | down_read(&dev->attach_lock); | |
2454 | attach_locked = true; | |
2455 | old_detach_count = dev->detach_count; | |
2456 | ||
ed9eccbe | 2457 | if (!dev->attached) { |
272850f0 | 2458 | dev_dbg(dev->class_dev, "no driver attached\n"); |
45c2bc55 IA |
2459 | retval = -ENODEV; |
2460 | goto out; | |
ed9eccbe DS |
2461 | } |
2462 | ||
20f083c0 | 2463 | s = comedi_file_read_subdevice(file); |
45c2bc55 IA |
2464 | if (!s || !s->async) { |
2465 | retval = -EIO; | |
2466 | goto out; | |
2467 | } | |
5c87fef5 | 2468 | |
ed9eccbe | 2469 | async = s->async; |
39582847 | 2470 | if (s->busy != file || (async->cmd.flags & CMDF_WRITE)) { |
f025ab9e IA |
2471 | retval = -EINVAL; |
2472 | goto out; | |
2473 | } | |
ed9eccbe DS |
2474 | |
2475 | add_wait_queue(&async->wait_head, &wait); | |
3c3bea26 | 2476 | while (count == 0 && !retval) { |
42ea907d IA |
2477 | unsigned int rp, n1, n2; |
2478 | ||
ed9eccbe DS |
2479 | set_current_state(TASK_INTERRUPTIBLE); |
2480 | ||
e9edef3a | 2481 | m = comedi_buf_read_n_available(s); |
8ea93928 | 2482 | n = min_t(size_t, m, nbytes); |
ed9eccbe DS |
2483 | |
2484 | if (n == 0) { | |
b183a836 IA |
2485 | unsigned runflags = comedi_get_subdevice_runflags(s); |
2486 | ||
2487 | if (!comedi_is_runflags_running(runflags)) { | |
2488 | if (comedi_is_runflags_in_error(runflags)) | |
ed9eccbe | 2489 | retval = -EPIPE; |
3c3bea26 IA |
2490 | if (retval || nbytes) |
2491 | become_nonbusy = true; | |
ed9eccbe DS |
2492 | break; |
2493 | } | |
3c3bea26 IA |
2494 | if (nbytes == 0) |
2495 | break; | |
ed9eccbe DS |
2496 | if (file->f_flags & O_NONBLOCK) { |
2497 | retval = -EAGAIN; | |
2498 | break; | |
2499 | } | |
6a9ce6b6 | 2500 | schedule(); |
ed9eccbe DS |
2501 | if (signal_pending(current)) { |
2502 | retval = -ERESTARTSYS; | |
2503 | break; | |
2504 | } | |
39582847 IA |
2505 | if (s->busy != file || |
2506 | (async->cmd.flags & CMDF_WRITE)) { | |
f025ab9e IA |
2507 | retval = -EINVAL; |
2508 | break; | |
2509 | } | |
ed9eccbe DS |
2510 | continue; |
2511 | } | |
42ea907d IA |
2512 | rp = async->buf_read_ptr; |
2513 | n1 = min(n, async->prealloc_bufsz - rp); | |
2514 | n2 = n - n1; | |
2515 | m = copy_to_user(buf, async->prealloc_buf + rp, n1); | |
2516 | if (m) | |
2517 | m += n2; | |
2518 | else if (n2) | |
2519 | m = copy_to_user(buf + n1, async->prealloc_buf, n2); | |
ed9eccbe DS |
2520 | if (m) { |
2521 | n -= m; | |
2522 | retval = -EFAULT; | |
2523 | } | |
2524 | ||
d13be55a | 2525 | comedi_buf_read_alloc(s, n); |
f1df8662 | 2526 | comedi_buf_read_free(s, n); |
ed9eccbe DS |
2527 | |
2528 | count += n; | |
2529 | nbytes -= n; | |
2530 | ||
2531 | buf += n; | |
ed9eccbe | 2532 | } |
45c2bc55 IA |
2533 | remove_wait_queue(&async->wait_head, &wait); |
2534 | set_current_state(TASK_RUNNING); | |
970679b0 | 2535 | if (become_nonbusy && count == 0) { |
45c2bc55 IA |
2536 | struct comedi_subdevice *new_s; |
2537 | ||
2538 | /* | |
2539 | * To avoid deadlock, cannot acquire dev->mutex | |
2540 | * while dev->attach_lock is held. | |
2541 | */ | |
2542 | up_read(&dev->attach_lock); | |
2543 | attach_locked = false; | |
4b18f08b | 2544 | mutex_lock(&dev->mutex); |
45c2bc55 IA |
2545 | /* |
2546 | * Check device hasn't become detached behind our back. | |
2547 | * Checking dev->detach_count is unchanged ought to be | |
2548 | * sufficient (unless there have been 2**32 detaches in the | |
2549 | * meantime!), but check the subdevice pointer as well just in | |
2550 | * case. | |
fd060c8f IA |
2551 | * |
2552 | * Also check the subdevice is still in a suitable state to | |
2553 | * become non-busy in case it changed behind our back. | |
45c2bc55 | 2554 | */ |
20f083c0 | 2555 | new_s = comedi_file_read_subdevice(file); |
45c2bc55 | 2556 | if (dev->attached && old_detach_count == dev->detach_count && |
fd060c8f IA |
2557 | s == new_s && new_s->async == async && s->busy == file && |
2558 | !(async->cmd.flags & CMDF_WRITE) && | |
2559 | !comedi_is_subdevice_running(s) && | |
2560 | comedi_buf_read_n_available(s) == 0) | |
2561 | do_become_nonbusy(dev, s); | |
4b18f08b | 2562 | mutex_unlock(&dev->mutex); |
ed9eccbe | 2563 | } |
45c2bc55 IA |
2564 | out: |
2565 | if (attach_locked) | |
2566 | up_read(&dev->attach_lock); | |
ed9eccbe | 2567 | |
476b8477 | 2568 | return count ? count : retval; |
ed9eccbe DS |
2569 | } |
2570 | ||
ed9eccbe DS |
2571 | static int comedi_open(struct inode *inode, struct file *file) |
2572 | { | |
ed9eccbe | 2573 | const unsigned minor = iminor(inode); |
20f083c0 | 2574 | struct comedi_file *cfp; |
fc406986 IA |
2575 | struct comedi_device *dev = comedi_dev_get_from_minor(minor); |
2576 | int rc; | |
97920071 | 2577 | |
4da5fa9a | 2578 | if (!dev) { |
272850f0 | 2579 | pr_debug("invalid minor number\n"); |
ed9eccbe DS |
2580 | return -ENODEV; |
2581 | } | |
2582 | ||
20f083c0 IA |
2583 | cfp = kzalloc(sizeof(*cfp), GFP_KERNEL); |
2584 | if (!cfp) | |
2585 | return -ENOMEM; | |
2586 | ||
2587 | cfp->dev = dev; | |
2588 | ||
ed9eccbe | 2589 | mutex_lock(&dev->mutex); |
0e0d311e IA |
2590 | if (!dev->attached && !capable(CAP_SYS_ADMIN)) { |
2591 | dev_dbg(dev->class_dev, "not attached and not CAP_SYS_ADMIN\n"); | |
fc406986 IA |
2592 | rc = -ENODEV; |
2593 | goto out; | |
ed9eccbe | 2594 | } |
1363e4fb | 2595 | if (dev->attached && dev->use_count == 0) { |
ed9eccbe | 2596 | if (!try_module_get(dev->driver->module)) { |
90e6f51d | 2597 | rc = -ENXIO; |
fc406986 | 2598 | goto out; |
ed9eccbe | 2599 | } |
1363e4fb IA |
2600 | if (dev->open) { |
2601 | rc = dev->open(dev); | |
2602 | if (rc < 0) { | |
2603 | module_put(dev->driver->module); | |
2604 | goto out; | |
2605 | } | |
3c17ba07 IA |
2606 | } |
2607 | } | |
ed9eccbe DS |
2608 | |
2609 | dev->use_count++; | |
20f083c0 IA |
2610 | file->private_data = cfp; |
2611 | comedi_file_reset(file); | |
fc406986 | 2612 | rc = 0; |
ed9eccbe | 2613 | |
fc406986 | 2614 | out: |
a5011a26 | 2615 | mutex_unlock(&dev->mutex); |
20f083c0 | 2616 | if (rc) { |
fc406986 | 2617 | comedi_dev_put(dev); |
20f083c0 IA |
2618 | kfree(cfp); |
2619 | } | |
fc406986 | 2620 | return rc; |
ed9eccbe DS |
2621 | } |
2622 | ||
2aae0076 HS |
2623 | static int comedi_fasync(int fd, struct file *file, int on) |
2624 | { | |
20f083c0 IA |
2625 | struct comedi_file *cfp = file->private_data; |
2626 | struct comedi_device *dev = cfp->dev; | |
2aae0076 HS |
2627 | |
2628 | return fasync_helper(fd, file, on, &dev->async_queue); | |
2629 | } | |
2630 | ||
a5011a26 | 2631 | static int comedi_close(struct inode *inode, struct file *file) |
ed9eccbe | 2632 | { |
20f083c0 IA |
2633 | struct comedi_file *cfp = file->private_data; |
2634 | struct comedi_device *dev = cfp->dev; | |
a5011a26 | 2635 | struct comedi_subdevice *s = NULL; |
ed9eccbe DS |
2636 | int i; |
2637 | ||
a5011a26 HS |
2638 | mutex_lock(&dev->mutex); |
2639 | ||
2640 | if (dev->subdevices) { | |
2641 | for (i = 0; i < dev->n_subdevices; i++) { | |
b077f2cd | 2642 | s = &dev->subdevices[i]; |
a5011a26 HS |
2643 | |
2644 | if (s->busy == file) | |
2645 | do_cancel(dev, s); | |
2646 | if (s->lock == file) | |
2647 | s->lock = NULL; | |
2648 | } | |
ed9eccbe | 2649 | } |
1363e4fb IA |
2650 | if (dev->attached && dev->use_count == 1) { |
2651 | if (dev->close) | |
2652 | dev->close(dev); | |
a5011a26 | 2653 | module_put(dev->driver->module); |
1363e4fb | 2654 | } |
a5011a26 HS |
2655 | |
2656 | dev->use_count--; | |
2657 | ||
2658 | mutex_unlock(&dev->mutex); | |
fc406986 | 2659 | comedi_dev_put(dev); |
20f083c0 | 2660 | kfree(cfp); |
a5011a26 | 2661 | |
ed9eccbe DS |
2662 | return 0; |
2663 | } | |
2664 | ||
8cb8aad7 | 2665 | static const struct file_operations comedi_fops = { |
a5011a26 HS |
2666 | .owner = THIS_MODULE, |
2667 | .unlocked_ioctl = comedi_unlocked_ioctl, | |
2668 | .compat_ioctl = comedi_compat_ioctl, | |
2669 | .open = comedi_open, | |
2670 | .release = comedi_close, | |
2671 | .read = comedi_read, | |
2672 | .write = comedi_write, | |
2673 | .mmap = comedi_mmap, | |
2674 | .poll = comedi_poll, | |
2675 | .fasync = comedi_fasync, | |
2676 | .llseek = noop_llseek, | |
2677 | }; | |
2678 | ||
dd630cde | 2679 | /** |
a3e39942 IA |
2680 | * comedi_event() - Handle events for asynchronous COMEDI command |
2681 | * @dev: COMEDI device. | |
2682 | * @s: COMEDI subdevice. | |
2683 | * Context: in_interrupt() (usually), @s->spin_lock spin-lock not held. | |
dd630cde | 2684 | * |
a3e39942 IA |
2685 | * If an asynchronous COMEDI command is active on the subdevice, process |
2686 | * any %COMEDI_CB_... event flags that have been set, usually by an | |
dd630cde | 2687 | * interrupt handler. These may change the run state of the asynchronous |
a3e39942 | 2688 | * command, wake a task, and/or send a %SIGIO signal. |
dd630cde | 2689 | */ |
a5011a26 | 2690 | void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s) |
883db3d9 | 2691 | { |
a5011a26 | 2692 | struct comedi_async *async = s->async; |
ef4b4b27 IA |
2693 | unsigned int events; |
2694 | int si_code = 0; | |
2695 | unsigned long flags; | |
2696 | ||
2697 | spin_lock_irqsave(&s->spin_lock, flags); | |
883db3d9 | 2698 | |
ef4b4b27 | 2699 | events = async->events; |
922d9ced | 2700 | async->events = 0; |
ef4b4b27 IA |
2701 | if (!__comedi_is_subdevice_running(s)) { |
2702 | spin_unlock_irqrestore(&s->spin_lock, flags); | |
a5011a26 | 2703 | return; |
ef4b4b27 | 2704 | } |
a5011a26 | 2705 | |
922d9ced | 2706 | if (events & COMEDI_CB_CANCEL_MASK) |
ef4b4b27 | 2707 | __comedi_clear_subdevice_runflags(s, COMEDI_SRF_RUNNING); |
781f933c HS |
2708 | |
2709 | /* | |
ef4b4b27 IA |
2710 | * Remember if an error event has occurred, so an error can be |
2711 | * returned the next time the user does a read() or write(). | |
781f933c | 2712 | */ |
ef4b4b27 IA |
2713 | if (events & COMEDI_CB_ERROR_MASK) |
2714 | __comedi_set_subdevice_runflags(s, COMEDI_SRF_ERROR); | |
883db3d9 | 2715 | |
922d9ced | 2716 | if (async->cb_mask & events) { |
c265be01 | 2717 | wake_up_interruptible(&async->wait_head); |
aa33122f | 2718 | si_code = async->cmd.flags & CMDF_WRITE ? POLL_OUT : POLL_IN; |
a5011a26 | 2719 | } |
ef4b4b27 IA |
2720 | |
2721 | spin_unlock_irqrestore(&s->spin_lock, flags); | |
2722 | ||
2723 | if (si_code) | |
2724 | kill_fasync(&dev->async_queue, SIGIO, si_code); | |
883db3d9 | 2725 | } |
5660e742 | 2726 | EXPORT_SYMBOL_GPL(comedi_event); |
883db3d9 | 2727 | |
07778393 | 2728 | /* Note: the ->mutex is pre-locked on successful return */ |
7638ffcb | 2729 | struct comedi_device *comedi_alloc_board_minor(struct device *hardware_device) |
a5011a26 | 2730 | { |
7638ffcb | 2731 | struct comedi_device *dev; |
a5011a26 HS |
2732 | struct device *csdev; |
2733 | unsigned i; | |
a5011a26 | 2734 | |
36efbacd | 2735 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
88cc30cf | 2736 | if (!dev) |
7638ffcb | 2737 | return ERR_PTR(-ENOMEM); |
7638ffcb | 2738 | comedi_device_init(dev); |
db2e3487 | 2739 | comedi_set_hw_dev(dev, hardware_device); |
07778393 | 2740 | mutex_lock(&dev->mutex); |
5b7dba1b | 2741 | mutex_lock(&comedi_board_minor_table_lock); |
38b9722a IA |
2742 | for (i = hardware_device ? comedi_num_legacy_minors : 0; |
2743 | i < COMEDI_NUM_BOARD_MINORS; ++i) { | |
88cc30cf | 2744 | if (!comedi_board_minor_table[i]) { |
cb6b79de | 2745 | comedi_board_minor_table[i] = dev; |
a5011a26 HS |
2746 | break; |
2747 | } | |
2748 | } | |
5b7dba1b | 2749 | mutex_unlock(&comedi_board_minor_table_lock); |
a5011a26 | 2750 | if (i == COMEDI_NUM_BOARD_MINORS) { |
07778393 | 2751 | mutex_unlock(&dev->mutex); |
7638ffcb | 2752 | comedi_device_cleanup(dev); |
5b13ed94 | 2753 | comedi_dev_put(dev); |
a112eab4 HM |
2754 | dev_err(hardware_device, |
2755 | "ran out of minor numbers for board device files\n"); | |
7638ffcb | 2756 | return ERR_PTR(-EBUSY); |
a5011a26 | 2757 | } |
7638ffcb | 2758 | dev->minor = i; |
a5011a26 HS |
2759 | csdev = device_create(comedi_class, hardware_device, |
2760 | MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i", i); | |
2761 | if (!IS_ERR(csdev)) | |
8f988d87 | 2762 | dev->class_dev = get_device(csdev); |
883db3d9 | 2763 | |
07778393 | 2764 | /* Note: dev->mutex needs to be unlocked by the caller. */ |
7638ffcb | 2765 | return dev; |
883db3d9 FMH |
2766 | } |
2767 | ||
3346b798 | 2768 | void comedi_release_hardware_device(struct device *hardware_device) |
883db3d9 | 2769 | { |
a5011a26 | 2770 | int minor; |
cb6b79de | 2771 | struct comedi_device *dev; |
883db3d9 | 2772 | |
38b9722a IA |
2773 | for (minor = comedi_num_legacy_minors; minor < COMEDI_NUM_BOARD_MINORS; |
2774 | minor++) { | |
5b7dba1b | 2775 | mutex_lock(&comedi_board_minor_table_lock); |
cb6b79de IA |
2776 | dev = comedi_board_minor_table[minor]; |
2777 | if (dev && dev->hw_dev == hardware_device) { | |
5b7dba1b IA |
2778 | comedi_board_minor_table[minor] = NULL; |
2779 | mutex_unlock(&comedi_board_minor_table_lock); | |
cb6b79de | 2780 | comedi_free_board_dev(dev); |
3346b798 | 2781 | break; |
a5011a26 | 2782 | } |
5b7dba1b | 2783 | mutex_unlock(&comedi_board_minor_table_lock); |
883db3d9 | 2784 | } |
883db3d9 FMH |
2785 | } |
2786 | ||
f65cc544 | 2787 | int comedi_alloc_subdevice_minor(struct comedi_subdevice *s) |
883db3d9 | 2788 | { |
f65cc544 | 2789 | struct comedi_device *dev = s->device; |
a5011a26 HS |
2790 | struct device *csdev; |
2791 | unsigned i; | |
883db3d9 | 2792 | |
5b7dba1b IA |
2793 | mutex_lock(&comedi_subdevice_minor_table_lock); |
2794 | for (i = 0; i < COMEDI_NUM_SUBDEVICE_MINORS; ++i) { | |
88cc30cf | 2795 | if (!comedi_subdevice_minor_table[i]) { |
bd5b4173 | 2796 | comedi_subdevice_minor_table[i] = s; |
a5011a26 HS |
2797 | break; |
2798 | } | |
2799 | } | |
5b7dba1b IA |
2800 | mutex_unlock(&comedi_subdevice_minor_table_lock); |
2801 | if (i == COMEDI_NUM_SUBDEVICE_MINORS) { | |
a112eab4 HM |
2802 | dev_err(dev->class_dev, |
2803 | "ran out of minor numbers for subdevice files\n"); | |
a5011a26 HS |
2804 | return -EBUSY; |
2805 | } | |
5b7dba1b | 2806 | i += COMEDI_NUM_BOARD_MINORS; |
a5011a26 HS |
2807 | s->minor = i; |
2808 | csdev = device_create(comedi_class, dev->class_dev, | |
2809 | MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i_subd%i", | |
90a35c15 | 2810 | dev->minor, s->index); |
a5011a26 HS |
2811 | if (!IS_ERR(csdev)) |
2812 | s->class_dev = csdev; | |
883db3d9 | 2813 | |
da718546 | 2814 | return 0; |
883db3d9 FMH |
2815 | } |
2816 | ||
a5011a26 | 2817 | void comedi_free_subdevice_minor(struct comedi_subdevice *s) |
883db3d9 | 2818 | { |
0fcc9d48 | 2819 | unsigned int i; |
883db3d9 | 2820 | |
88cc30cf | 2821 | if (!s) |
a5011a26 | 2822 | return; |
5104a898 HS |
2823 | if (s->minor < COMEDI_NUM_BOARD_MINORS || |
2824 | s->minor >= COMEDI_NUM_MINORS) | |
a5011a26 | 2825 | return; |
883db3d9 | 2826 | |
0fcc9d48 IA |
2827 | i = s->minor - COMEDI_NUM_BOARD_MINORS; |
2828 | mutex_lock(&comedi_subdevice_minor_table_lock); | |
bd5b4173 IA |
2829 | if (s == comedi_subdevice_minor_table[i]) |
2830 | comedi_subdevice_minor_table[i] = NULL; | |
0fcc9d48 | 2831 | mutex_unlock(&comedi_subdevice_minor_table_lock); |
a5011a26 HS |
2832 | if (s->class_dev) { |
2833 | device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor)); | |
2834 | s->class_dev = NULL; | |
883db3d9 | 2835 | } |
883db3d9 | 2836 | } |
a5787824 | 2837 | |
682b9119 | 2838 | static void comedi_cleanup_board_minors(void) |
76cca89f | 2839 | { |
2be8ae58 | 2840 | struct comedi_device *dev; |
76cca89f HS |
2841 | unsigned i; |
2842 | ||
2be8ae58 HS |
2843 | for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) { |
2844 | dev = comedi_clear_board_minor(i); | |
2845 | comedi_free_board_dev(dev); | |
2846 | } | |
76cca89f HS |
2847 | } |
2848 | ||
91fa0b0c HS |
2849 | static int __init comedi_init(void) |
2850 | { | |
2851 | int i; | |
2852 | int retval; | |
2853 | ||
c2ad078b | 2854 | pr_info("version " COMEDI_RELEASE " - http://www.comedi.org\n"); |
91fa0b0c HS |
2855 | |
2856 | if (comedi_num_legacy_minors < 0 || | |
2857 | comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) { | |
c2ad078b | 2858 | pr_err("invalid value for module parameter \"comedi_num_legacy_minors\". Valid values are 0 through %i.\n", |
91fa0b0c HS |
2859 | COMEDI_NUM_BOARD_MINORS); |
2860 | return -EINVAL; | |
2861 | } | |
2862 | ||
91fa0b0c HS |
2863 | retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0), |
2864 | COMEDI_NUM_MINORS, "comedi"); | |
2865 | if (retval) | |
2866 | return -EIO; | |
2867 | cdev_init(&comedi_cdev, &comedi_fops); | |
2868 | comedi_cdev.owner = THIS_MODULE; | |
a5bde3a1 AP |
2869 | |
2870 | retval = kobject_set_name(&comedi_cdev.kobj, "comedi"); | |
2871 | if (retval) { | |
2872 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
2873 | COMEDI_NUM_MINORS); | |
2874 | return retval; | |
2875 | } | |
2876 | ||
91fa0b0c HS |
2877 | if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) { |
2878 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
2879 | COMEDI_NUM_MINORS); | |
2880 | return -EIO; | |
2881 | } | |
2882 | comedi_class = class_create(THIS_MODULE, "comedi"); | |
2883 | if (IS_ERR(comedi_class)) { | |
c2ad078b | 2884 | pr_err("failed to create class\n"); |
91fa0b0c HS |
2885 | cdev_del(&comedi_cdev); |
2886 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
2887 | COMEDI_NUM_MINORS); | |
2888 | return PTR_ERR(comedi_class); | |
2889 | } | |
2890 | ||
e56341ad | 2891 | comedi_class->dev_groups = comedi_dev_groups; |
91fa0b0c HS |
2892 | |
2893 | /* XXX requires /proc interface */ | |
2894 | comedi_proc_init(); | |
2895 | ||
2896 | /* create devices files for legacy/manual use */ | |
2897 | for (i = 0; i < comedi_num_legacy_minors; i++) { | |
7638ffcb | 2898 | struct comedi_device *dev; |
4bac39f6 | 2899 | |
7638ffcb IA |
2900 | dev = comedi_alloc_board_minor(NULL); |
2901 | if (IS_ERR(dev)) { | |
682b9119 | 2902 | comedi_cleanup_board_minors(); |
91fa0b0c HS |
2903 | cdev_del(&comedi_cdev); |
2904 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
2905 | COMEDI_NUM_MINORS); | |
7638ffcb | 2906 | return PTR_ERR(dev); |
91fa0b0c | 2907 | } |
cb3aadae KH |
2908 | /* comedi_alloc_board_minor() locked the mutex */ |
2909 | mutex_unlock(&dev->mutex); | |
91fa0b0c HS |
2910 | } |
2911 | ||
2912 | return 0; | |
2913 | } | |
2914 | module_init(comedi_init); | |
2915 | ||
2916 | static void __exit comedi_cleanup(void) | |
2917 | { | |
682b9119 | 2918 | comedi_cleanup_board_minors(); |
91fa0b0c HS |
2919 | class_destroy(comedi_class); |
2920 | cdev_del(&comedi_cdev); | |
2921 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS); | |
2922 | ||
2923 | comedi_proc_cleanup(); | |
2924 | } | |
2925 | module_exit(comedi_cleanup); | |
2926 | ||
a5787824 HS |
2927 | MODULE_AUTHOR("http://www.comedi.org"); |
2928 | MODULE_DESCRIPTION("Comedi core module"); | |
2929 | MODULE_LICENSE("GPL"); |