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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 | ||
9682e28c HS |
689 | static bool comedi_is_subdevice_idle(struct comedi_subdevice *s) |
690 | { | |
691 | unsigned runflags = comedi_get_subdevice_runflags(s); | |
692 | ||
38ee1fd3 | 693 | return !(runflags & COMEDI_SRF_BUSY_MASK); |
9682e28c HS |
694 | } |
695 | ||
8fc369ae IA |
696 | bool comedi_can_auto_free_spriv(struct comedi_subdevice *s) |
697 | { | |
698 | unsigned runflags = __comedi_get_subdevice_runflags(s); | |
699 | ||
700 | return runflags & COMEDI_SRF_FREE_SPRIV; | |
701 | } | |
702 | ||
703 | /** | |
a3e39942 IA |
704 | * comedi_set_spriv_auto_free() - Mark subdevice private data as freeable |
705 | * @s: COMEDI subdevice. | |
8fc369ae IA |
706 | * |
707 | * Mark the subdevice as having a pointer to private data that can be | |
a3e39942 IA |
708 | * automatically freed when the COMEDI device is detached from the low-level |
709 | * driver. | |
8fc369ae IA |
710 | */ |
711 | void comedi_set_spriv_auto_free(struct comedi_subdevice *s) | |
712 | { | |
713 | __comedi_set_subdevice_runflags(s, COMEDI_SRF_FREE_SPRIV); | |
714 | } | |
715 | EXPORT_SYMBOL_GPL(comedi_set_spriv_auto_free); | |
716 | ||
588ba6dc | 717 | /** |
a3e39942 IA |
718 | * comedi_alloc_spriv - Allocate memory for the subdevice private data |
719 | * @s: COMEDI subdevice. | |
720 | * @size: Size of the memory to allocate. | |
588ba6dc | 721 | * |
a3e39942 IA |
722 | * Allocate memory for the subdevice private data and point @s->private |
723 | * to it. The memory will be freed automatically when the COMEDI device | |
724 | * is detached from the low-level driver. | |
725 | * | |
726 | * Return: A pointer to the allocated memory @s->private on success. | |
727 | * Return NULL on failure. | |
588ba6dc | 728 | */ |
0480bcb9 | 729 | void *comedi_alloc_spriv(struct comedi_subdevice *s, size_t size) |
588ba6dc | 730 | { |
0480bcb9 HS |
731 | s->private = kzalloc(size, GFP_KERNEL); |
732 | if (s->private) | |
8fc369ae | 733 | comedi_set_spriv_auto_free(s); |
0480bcb9 | 734 | return s->private; |
588ba6dc | 735 | } |
0480bcb9 | 736 | EXPORT_SYMBOL_GPL(comedi_alloc_spriv); |
588ba6dc | 737 | |
2aae0076 | 738 | /* |
a2aab8b4 | 739 | * This function restores a subdevice to an idle state. |
2aae0076 HS |
740 | */ |
741 | static void do_become_nonbusy(struct comedi_device *dev, | |
742 | struct comedi_subdevice *s) | |
743 | { | |
744 | struct comedi_async *async = s->async; | |
745 | ||
cc64ea42 | 746 | comedi_update_subdevice_runflags(s, COMEDI_SRF_RUNNING, 0); |
2aae0076 | 747 | if (async) { |
fcc18a9a | 748 | comedi_buf_reset(s); |
2aae0076 HS |
749 | async->inttrig = NULL; |
750 | kfree(async->cmd.chanlist); | |
751 | async->cmd.chanlist = NULL; | |
8da8c86f | 752 | s->busy = NULL; |
258c1dd7 | 753 | wake_up_interruptible_all(&async->wait_head); |
2aae0076 HS |
754 | } else { |
755 | dev_err(dev->class_dev, | |
756 | "BUG: (?) do_become_nonbusy called with async=NULL\n"); | |
8da8c86f | 757 | s->busy = NULL; |
2aae0076 | 758 | } |
2aae0076 HS |
759 | } |
760 | ||
761 | static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s) | |
762 | { | |
763 | int ret = 0; | |
764 | ||
f0124630 | 765 | if (comedi_is_subdevice_running(s) && s->cancel) |
2aae0076 HS |
766 | ret = s->cancel(dev, s); |
767 | ||
768 | do_become_nonbusy(dev, s); | |
769 | ||
770 | return ret; | |
771 | } | |
772 | ||
d19db51a IA |
773 | void comedi_device_cancel_all(struct comedi_device *dev) |
774 | { | |
775 | struct comedi_subdevice *s; | |
776 | int i; | |
777 | ||
778 | if (!dev->attached) | |
779 | return; | |
780 | ||
781 | for (i = 0; i < dev->n_subdevices; i++) { | |
782 | s = &dev->subdevices[i]; | |
783 | if (s->async) | |
784 | do_cancel(dev, s); | |
785 | } | |
786 | } | |
787 | ||
2aae0076 HS |
788 | static int is_device_busy(struct comedi_device *dev) |
789 | { | |
790 | struct comedi_subdevice *s; | |
791 | int i; | |
792 | ||
793 | if (!dev->attached) | |
794 | return 0; | |
795 | ||
796 | for (i = 0; i < dev->n_subdevices; i++) { | |
797 | s = &dev->subdevices[i]; | |
798 | if (s->busy) | |
799 | return 1; | |
d4526ab4 | 800 | if (s->async && comedi_buf_is_mmapped(s)) |
2aae0076 HS |
801 | return 1; |
802 | } | |
803 | ||
804 | return 0; | |
805 | } | |
806 | ||
ed9eccbe | 807 | /* |
18e01b24 IA |
808 | * COMEDI_DEVCONFIG ioctl |
809 | * attaches (and configures) or detaches a legacy device | |
810 | * | |
811 | * arg: | |
812 | * pointer to comedi_devconfig structure (NULL if detaching) | |
813 | * | |
814 | * reads: | |
815 | * comedi_devconfig structure (if attaching) | |
816 | * | |
817 | * writes: | |
818 | * nothing | |
819 | */ | |
0a85b6f0 | 820 | static int do_devconfig_ioctl(struct comedi_device *dev, |
92d0127c | 821 | struct comedi_devconfig __user *arg) |
ed9eccbe | 822 | { |
0707bb04 | 823 | struct comedi_devconfig it; |
ed9eccbe DS |
824 | |
825 | if (!capable(CAP_SYS_ADMIN)) | |
826 | return -EPERM; | |
827 | ||
88cc30cf | 828 | if (!arg) { |
ed9eccbe DS |
829 | if (is_device_busy(dev)) |
830 | return -EBUSY; | |
476b8477 | 831 | if (dev->attached) { |
ed9eccbe | 832 | struct module *driver_module = dev->driver->module; |
4bac39f6 | 833 | |
ed9eccbe DS |
834 | comedi_device_detach(dev); |
835 | module_put(driver_module); | |
836 | } | |
837 | return 0; | |
838 | } | |
839 | ||
bc252fd1 | 840 | if (copy_from_user(&it, arg, sizeof(it))) |
ed9eccbe DS |
841 | return -EFAULT; |
842 | ||
843 | it.board_name[COMEDI_NAMELEN - 1] = 0; | |
844 | ||
d1843132 HS |
845 | if (it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) { |
846 | dev_warn(dev->class_dev, | |
847 | "comedi_config --init_data is deprecated\n"); | |
848 | return -EINVAL; | |
ed9eccbe DS |
849 | } |
850 | ||
8ab4ed6e IA |
851 | if (dev->minor >= comedi_num_legacy_minors) |
852 | /* don't re-use dynamically allocated comedi devices */ | |
853 | return -EBUSY; | |
854 | ||
b2a644b4 IA |
855 | /* This increments the driver module count on success. */ |
856 | return comedi_device_attach(dev, &it); | |
ed9eccbe DS |
857 | } |
858 | ||
859 | /* | |
18e01b24 IA |
860 | * COMEDI_BUFCONFIG ioctl |
861 | * buffer configuration | |
862 | * | |
863 | * arg: | |
864 | * pointer to comedi_bufconfig structure | |
865 | * | |
866 | * reads: | |
867 | * comedi_bufconfig structure | |
868 | * | |
869 | * writes: | |
870 | * modified comedi_bufconfig structure | |
871 | */ | |
92d0127c GKH |
872 | static int do_bufconfig_ioctl(struct comedi_device *dev, |
873 | struct comedi_bufconfig __user *arg) | |
ed9eccbe | 874 | { |
be6aba4a | 875 | struct comedi_bufconfig bc; |
d163679c | 876 | struct comedi_async *async; |
34c43922 | 877 | struct comedi_subdevice *s; |
883db3d9 | 878 | int retval = 0; |
ed9eccbe | 879 | |
bc252fd1 | 880 | if (copy_from_user(&bc, arg, sizeof(bc))) |
ed9eccbe DS |
881 | return -EFAULT; |
882 | ||
11f80ddf | 883 | if (bc.subdevice >= dev->n_subdevices) |
ed9eccbe DS |
884 | return -EINVAL; |
885 | ||
b077f2cd | 886 | s = &dev->subdevices[bc.subdevice]; |
ed9eccbe DS |
887 | async = s->async; |
888 | ||
889 | if (!async) { | |
272850f0 HS |
890 | dev_dbg(dev->class_dev, |
891 | "subdevice does not have async capability\n"); | |
ed9eccbe DS |
892 | bc.size = 0; |
893 | bc.maximum_size = 0; | |
894 | goto copyback; | |
895 | } | |
896 | ||
897 | if (bc.maximum_size) { | |
898 | if (!capable(CAP_SYS_ADMIN)) | |
899 | return -EPERM; | |
900 | ||
901 | async->max_bufsize = bc.maximum_size; | |
902 | } | |
903 | ||
904 | if (bc.size) { | |
482f0a21 | 905 | retval = resize_async_buffer(dev, s, bc.size); |
883db3d9 FMH |
906 | if (retval < 0) |
907 | return retval; | |
ed9eccbe DS |
908 | } |
909 | ||
910 | bc.size = async->prealloc_bufsz; | |
911 | bc.maximum_size = async->max_bufsize; | |
912 | ||
476b8477 | 913 | copyback: |
bc252fd1 | 914 | if (copy_to_user(arg, &bc, sizeof(bc))) |
ed9eccbe DS |
915 | return -EFAULT; |
916 | ||
917 | return 0; | |
918 | } | |
919 | ||
920 | /* | |
18e01b24 IA |
921 | * COMEDI_DEVINFO ioctl |
922 | * device info | |
923 | * | |
924 | * arg: | |
925 | * pointer to comedi_devinfo structure | |
926 | * | |
927 | * reads: | |
928 | * nothing | |
929 | * | |
930 | * writes: | |
931 | * comedi_devinfo structure | |
932 | */ | |
0a85b6f0 | 933 | static int do_devinfo_ioctl(struct comedi_device *dev, |
92d0127c GKH |
934 | struct comedi_devinfo __user *arg, |
935 | struct file *file) | |
ed9eccbe | 936 | { |
0e700923 HS |
937 | struct comedi_subdevice *s; |
938 | struct comedi_devinfo devinfo; | |
ed9eccbe DS |
939 | |
940 | memset(&devinfo, 0, sizeof(devinfo)); | |
941 | ||
942 | /* fill devinfo structure */ | |
943 | devinfo.version_code = COMEDI_VERSION_CODE; | |
944 | devinfo.n_subdevs = dev->n_subdevices; | |
819cbb12 VK |
945 | strlcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN); |
946 | strlcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN); | |
ed9eccbe | 947 | |
20f083c0 | 948 | s = comedi_file_read_subdevice(file); |
0e700923 | 949 | if (s) |
90a35c15 | 950 | devinfo.read_subdevice = s->index; |
476b8477 | 951 | else |
ed9eccbe | 952 | devinfo.read_subdevice = -1; |
476b8477 | 953 | |
20f083c0 | 954 | s = comedi_file_write_subdevice(file); |
0e700923 | 955 | if (s) |
90a35c15 | 956 | devinfo.write_subdevice = s->index; |
476b8477 | 957 | else |
ed9eccbe | 958 | devinfo.write_subdevice = -1; |
ed9eccbe | 959 | |
bc252fd1 | 960 | if (copy_to_user(arg, &devinfo, sizeof(devinfo))) |
ed9eccbe DS |
961 | return -EFAULT; |
962 | ||
963 | return 0; | |
964 | } | |
965 | ||
966 | /* | |
18e01b24 IA |
967 | * COMEDI_SUBDINFO ioctl |
968 | * subdevices info | |
969 | * | |
970 | * arg: | |
971 | * pointer to array of comedi_subdinfo structures | |
972 | * | |
973 | * reads: | |
974 | * nothing | |
975 | * | |
976 | * writes: | |
977 | * array of comedi_subdinfo structures | |
978 | */ | |
0a85b6f0 | 979 | static int do_subdinfo_ioctl(struct comedi_device *dev, |
92d0127c | 980 | struct comedi_subdinfo __user *arg, void *file) |
ed9eccbe DS |
981 | { |
982 | int ret, i; | |
bd52efbb | 983 | struct comedi_subdinfo *tmp, *us; |
34c43922 | 984 | struct comedi_subdevice *s; |
ed9eccbe | 985 | |
bc252fd1 | 986 | tmp = kcalloc(dev->n_subdevices, sizeof(*tmp), GFP_KERNEL); |
ed9eccbe DS |
987 | if (!tmp) |
988 | return -ENOMEM; | |
989 | ||
990 | /* fill subdinfo structs */ | |
991 | for (i = 0; i < dev->n_subdevices; i++) { | |
b077f2cd | 992 | s = &dev->subdevices[i]; |
ed9eccbe DS |
993 | us = tmp + i; |
994 | ||
995 | us->type = s->type; | |
996 | us->n_chan = s->n_chan; | |
997 | us->subd_flags = s->subdev_flags; | |
f0124630 | 998 | if (comedi_is_subdevice_running(s)) |
ed9eccbe DS |
999 | us->subd_flags |= SDF_RUNNING; |
1000 | #define TIMER_nanosec 5 /* backwards compatibility */ | |
1001 | us->timer_type = TIMER_nanosec; | |
1002 | us->len_chanlist = s->len_chanlist; | |
1003 | us->maxdata = s->maxdata; | |
1004 | if (s->range_table) { | |
1005 | us->range_type = | |
476b8477 | 1006 | (i << 24) | (0 << 16) | (s->range_table->length); |
ed9eccbe DS |
1007 | } else { |
1008 | us->range_type = 0; /* XXX */ | |
1009 | } | |
ed9eccbe DS |
1010 | |
1011 | if (s->busy) | |
1012 | us->subd_flags |= SDF_BUSY; | |
1013 | if (s->busy == file) | |
1014 | us->subd_flags |= SDF_BUSY_OWNER; | |
1015 | if (s->lock) | |
1016 | us->subd_flags |= SDF_LOCKED; | |
1017 | if (s->lock == file) | |
1018 | us->subd_flags |= SDF_LOCK_OWNER; | |
1019 | if (!s->maxdata && s->maxdata_list) | |
1020 | us->subd_flags |= SDF_MAXDATA; | |
ed9eccbe DS |
1021 | if (s->range_table_list) |
1022 | us->subd_flags |= SDF_RANGETYPE; | |
1023 | if (s->do_cmd) | |
1024 | us->subd_flags |= SDF_CMD; | |
1025 | ||
1026 | if (s->insn_bits != &insn_inval) | |
1027 | us->insn_bits_support = COMEDI_SUPPORTED; | |
1028 | else | |
1029 | us->insn_bits_support = COMEDI_UNSUPPORTED; | |
ed9eccbe DS |
1030 | } |
1031 | ||
bc252fd1 | 1032 | ret = copy_to_user(arg, tmp, dev->n_subdevices * sizeof(*tmp)); |
ed9eccbe DS |
1033 | |
1034 | kfree(tmp); | |
1035 | ||
1036 | return ret ? -EFAULT : 0; | |
1037 | } | |
1038 | ||
1039 | /* | |
18e01b24 IA |
1040 | * COMEDI_CHANINFO ioctl |
1041 | * subdevice channel info | |
1042 | * | |
1043 | * arg: | |
1044 | * pointer to comedi_chaninfo structure | |
1045 | * | |
1046 | * reads: | |
1047 | * comedi_chaninfo structure | |
1048 | * | |
1049 | * writes: | |
1050 | * array of maxdata values to chaninfo->maxdata_list if requested | |
1051 | * array of range table lengths to chaninfo->range_table_list if requested | |
1052 | */ | |
0a85b6f0 | 1053 | static int do_chaninfo_ioctl(struct comedi_device *dev, |
92d0127c | 1054 | struct comedi_chaninfo __user *arg) |
ed9eccbe | 1055 | { |
34c43922 | 1056 | struct comedi_subdevice *s; |
a18b416d | 1057 | struct comedi_chaninfo it; |
ed9eccbe | 1058 | |
bc252fd1 | 1059 | if (copy_from_user(&it, arg, sizeof(it))) |
ed9eccbe DS |
1060 | return -EFAULT; |
1061 | ||
1062 | if (it.subdev >= dev->n_subdevices) | |
1063 | return -EINVAL; | |
b077f2cd | 1064 | s = &dev->subdevices[it.subdev]; |
ed9eccbe DS |
1065 | |
1066 | if (it.maxdata_list) { | |
1067 | if (s->maxdata || !s->maxdata_list) | |
1068 | return -EINVAL; | |
1069 | if (copy_to_user(it.maxdata_list, s->maxdata_list, | |
790c5541 | 1070 | s->n_chan * sizeof(unsigned int))) |
ed9eccbe DS |
1071 | return -EFAULT; |
1072 | } | |
1073 | ||
64d9b1d2 IA |
1074 | if (it.flaglist) |
1075 | return -EINVAL; /* flaglist not supported */ | |
ed9eccbe DS |
1076 | |
1077 | if (it.rangelist) { | |
1078 | int i; | |
1079 | ||
1080 | if (!s->range_table_list) | |
1081 | return -EINVAL; | |
1082 | for (i = 0; i < s->n_chan; i++) { | |
1083 | int x; | |
1084 | ||
1085 | x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) | | |
476b8477 | 1086 | (s->range_table_list[i]->length); |
81604d43 VK |
1087 | if (put_user(x, it.rangelist + i)) |
1088 | return -EFAULT; | |
ed9eccbe | 1089 | } |
ed9eccbe DS |
1090 | } |
1091 | ||
1092 | return 0; | |
1093 | } | |
1094 | ||
18e01b24 IA |
1095 | /* |
1096 | * COMEDI_BUFINFO ioctl | |
1097 | * buffer information | |
1098 | * | |
1099 | * arg: | |
1100 | * pointer to comedi_bufinfo structure | |
1101 | * | |
1102 | * reads: | |
1103 | * comedi_bufinfo structure | |
1104 | * | |
1105 | * writes: | |
1106 | * modified comedi_bufinfo structure | |
1107 | */ | |
92d0127c | 1108 | static int do_bufinfo_ioctl(struct comedi_device *dev, |
53fa827e | 1109 | struct comedi_bufinfo __user *arg, void *file) |
ed9eccbe | 1110 | { |
9aa5339a | 1111 | struct comedi_bufinfo bi; |
34c43922 | 1112 | struct comedi_subdevice *s; |
d163679c | 1113 | struct comedi_async *async; |
ed9eccbe | 1114 | |
bc252fd1 | 1115 | if (copy_from_user(&bi, arg, sizeof(bi))) |
ed9eccbe DS |
1116 | return -EFAULT; |
1117 | ||
7b1a5e2f | 1118 | if (bi.subdevice >= dev->n_subdevices) |
ed9eccbe DS |
1119 | return -EINVAL; |
1120 | ||
b077f2cd | 1121 | s = &dev->subdevices[bi.subdevice]; |
53fa827e | 1122 | |
ed9eccbe DS |
1123 | async = s->async; |
1124 | ||
1125 | if (!async) { | |
272850f0 HS |
1126 | dev_dbg(dev->class_dev, |
1127 | "subdevice does not have async capability\n"); | |
ed9eccbe DS |
1128 | bi.buf_write_ptr = 0; |
1129 | bi.buf_read_ptr = 0; | |
1130 | bi.buf_write_count = 0; | |
1131 | bi.buf_read_count = 0; | |
4772c018 IA |
1132 | bi.bytes_read = 0; |
1133 | bi.bytes_written = 0; | |
ed9eccbe DS |
1134 | goto copyback; |
1135 | } | |
53fa827e IA |
1136 | if (!s->busy) { |
1137 | bi.bytes_read = 0; | |
1138 | bi.bytes_written = 0; | |
1139 | goto copyback_position; | |
1140 | } | |
1141 | if (s->busy != file) | |
1142 | return -EACCES; | |
ed9eccbe | 1143 | |
75f6108f | 1144 | if (bi.bytes_read && !(async->cmd.flags & CMDF_WRITE)) { |
d13be55a | 1145 | bi.bytes_read = comedi_buf_read_alloc(s, bi.bytes_read); |
f1df8662 | 1146 | comedi_buf_read_free(s, bi.bytes_read); |
ed9eccbe | 1147 | |
9682e28c | 1148 | if (comedi_is_subdevice_idle(s) && |
f4f3f7cf | 1149 | comedi_buf_n_bytes_ready(s) == 0) { |
ed9eccbe DS |
1150 | do_become_nonbusy(dev, s); |
1151 | } | |
1152 | } | |
1153 | ||
75f6108f | 1154 | if (bi.bytes_written && (async->cmd.flags & CMDF_WRITE)) { |
ed9eccbe | 1155 | bi.bytes_written = |
24e894bb | 1156 | comedi_buf_write_alloc(s, bi.bytes_written); |
940dd35d | 1157 | comedi_buf_write_free(s, bi.bytes_written); |
ed9eccbe DS |
1158 | } |
1159 | ||
53fa827e | 1160 | copyback_position: |
ed9eccbe DS |
1161 | bi.buf_write_count = async->buf_write_count; |
1162 | bi.buf_write_ptr = async->buf_write_ptr; | |
1163 | bi.buf_read_count = async->buf_read_count; | |
1164 | bi.buf_read_ptr = async->buf_read_ptr; | |
1165 | ||
476b8477 | 1166 | copyback: |
bc252fd1 | 1167 | if (copy_to_user(arg, &bi, sizeof(bi))) |
ed9eccbe DS |
1168 | return -EFAULT; |
1169 | ||
1170 | return 0; | |
1171 | } | |
1172 | ||
0a85b6f0 MT |
1173 | static int check_insn_config_length(struct comedi_insn *insn, |
1174 | unsigned int *data) | |
ed9eccbe | 1175 | { |
476b8477 GKH |
1176 | if (insn->n < 1) |
1177 | return -EINVAL; | |
ed9eccbe DS |
1178 | |
1179 | switch (data[0]) { | |
1180 | case INSN_CONFIG_DIO_OUTPUT: | |
1181 | case INSN_CONFIG_DIO_INPUT: | |
1182 | case INSN_CONFIG_DISARM: | |
1183 | case INSN_CONFIG_RESET: | |
1184 | if (insn->n == 1) | |
1185 | return 0; | |
1186 | break; | |
1187 | case INSN_CONFIG_ARM: | |
1188 | case INSN_CONFIG_DIO_QUERY: | |
1189 | case INSN_CONFIG_BLOCK_SIZE: | |
1190 | case INSN_CONFIG_FILTER: | |
1191 | case INSN_CONFIG_SERIAL_CLOCK: | |
1192 | case INSN_CONFIG_BIDIRECTIONAL_DATA: | |
1193 | case INSN_CONFIG_ALT_SOURCE: | |
1194 | case INSN_CONFIG_SET_COUNTER_MODE: | |
1195 | case INSN_CONFIG_8254_READ_STATUS: | |
1196 | case INSN_CONFIG_SET_ROUTING: | |
1197 | case INSN_CONFIG_GET_ROUTING: | |
1198 | case INSN_CONFIG_GET_PWM_STATUS: | |
1199 | case INSN_CONFIG_PWM_SET_PERIOD: | |
1200 | case INSN_CONFIG_PWM_GET_PERIOD: | |
1201 | if (insn->n == 2) | |
1202 | return 0; | |
1203 | break; | |
1204 | case INSN_CONFIG_SET_GATE_SRC: | |
1205 | case INSN_CONFIG_GET_GATE_SRC: | |
1206 | case INSN_CONFIG_SET_CLOCK_SRC: | |
1207 | case INSN_CONFIG_GET_CLOCK_SRC: | |
1208 | case INSN_CONFIG_SET_OTHER_SRC: | |
1209 | case INSN_CONFIG_GET_COUNTER_STATUS: | |
1210 | case INSN_CONFIG_PWM_SET_H_BRIDGE: | |
1211 | case INSN_CONFIG_PWM_GET_H_BRIDGE: | |
1212 | case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE: | |
1213 | if (insn->n == 3) | |
1214 | return 0; | |
1215 | break; | |
1216 | case INSN_CONFIG_PWM_OUTPUT: | |
1217 | case INSN_CONFIG_ANALOG_TRIG: | |
1218 | if (insn->n == 5) | |
1219 | return 0; | |
1220 | break; | |
b0a2b6d8 IA |
1221 | case INSN_CONFIG_DIGITAL_TRIG: |
1222 | if (insn->n == 6) | |
1223 | return 0; | |
1224 | break; | |
a2aab8b4 IA |
1225 | /* |
1226 | * by default we allow the insn since we don't have checks for | |
1227 | * all possible cases yet | |
1228 | */ | |
ed9eccbe | 1229 | default: |
c2ad078b | 1230 | pr_warn("No check for data length of config insn id %i is implemented\n", |
4f870fe6 | 1231 | data[0]); |
c2ad078b HS |
1232 | pr_warn("Add a check to %s in %s\n", __func__, __FILE__); |
1233 | pr_warn("Assuming n=%i is correct\n", insn->n); | |
ed9eccbe | 1234 | return 0; |
ed9eccbe DS |
1235 | } |
1236 | return -EINVAL; | |
1237 | } | |
1238 | ||
0a85b6f0 MT |
1239 | static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn, |
1240 | unsigned int *data, void *file) | |
ed9eccbe | 1241 | { |
34c43922 | 1242 | struct comedi_subdevice *s; |
ed9eccbe DS |
1243 | int ret = 0; |
1244 | int i; | |
1245 | ||
1246 | if (insn->insn & INSN_MASK_SPECIAL) { | |
1247 | /* a non-subdevice instruction */ | |
1248 | ||
1249 | switch (insn->insn) { | |
1250 | case INSN_GTOD: | |
1251 | { | |
1252 | struct timeval tv; | |
1253 | ||
1254 | if (insn->n != 2) { | |
1255 | ret = -EINVAL; | |
1256 | break; | |
1257 | } | |
1258 | ||
1259 | do_gettimeofday(&tv); | |
1260 | data[0] = tv.tv_sec; | |
1261 | data[1] = tv.tv_usec; | |
1262 | ret = 2; | |
1263 | ||
1264 | break; | |
1265 | } | |
1266 | case INSN_WAIT: | |
1267 | if (insn->n != 1 || data[0] >= 100000) { | |
1268 | ret = -EINVAL; | |
1269 | break; | |
1270 | } | |
1271 | udelay(data[0] / 1000); | |
1272 | ret = 1; | |
1273 | break; | |
1274 | case INSN_INTTRIG: | |
1275 | if (insn->n != 1) { | |
1276 | ret = -EINVAL; | |
1277 | break; | |
1278 | } | |
1279 | if (insn->subdev >= dev->n_subdevices) { | |
272850f0 HS |
1280 | dev_dbg(dev->class_dev, |
1281 | "%d not usable subdevice\n", | |
ed9eccbe DS |
1282 | insn->subdev); |
1283 | ret = -EINVAL; | |
1284 | break; | |
1285 | } | |
b077f2cd | 1286 | s = &dev->subdevices[insn->subdev]; |
ed9eccbe | 1287 | if (!s->async) { |
272850f0 | 1288 | dev_dbg(dev->class_dev, "no async\n"); |
ed9eccbe DS |
1289 | ret = -EINVAL; |
1290 | break; | |
1291 | } | |
1292 | if (!s->async->inttrig) { | |
272850f0 | 1293 | dev_dbg(dev->class_dev, "no inttrig\n"); |
ed9eccbe DS |
1294 | ret = -EAGAIN; |
1295 | break; | |
1296 | } | |
5d06e3df | 1297 | ret = s->async->inttrig(dev, s, data[0]); |
ed9eccbe DS |
1298 | if (ret >= 0) |
1299 | ret = 1; | |
1300 | break; | |
1301 | default: | |
272850f0 | 1302 | dev_dbg(dev->class_dev, "invalid insn\n"); |
ed9eccbe DS |
1303 | ret = -EINVAL; |
1304 | break; | |
1305 | } | |
1306 | } else { | |
1307 | /* a subdevice instruction */ | |
790c5541 | 1308 | unsigned int maxdata; |
ed9eccbe DS |
1309 | |
1310 | if (insn->subdev >= dev->n_subdevices) { | |
272850f0 HS |
1311 | dev_dbg(dev->class_dev, "subdevice %d out of range\n", |
1312 | insn->subdev); | |
ed9eccbe DS |
1313 | ret = -EINVAL; |
1314 | goto out; | |
1315 | } | |
b077f2cd | 1316 | s = &dev->subdevices[insn->subdev]; |
ed9eccbe DS |
1317 | |
1318 | if (s->type == COMEDI_SUBD_UNUSED) { | |
272850f0 HS |
1319 | dev_dbg(dev->class_dev, "%d not usable subdevice\n", |
1320 | insn->subdev); | |
ed9eccbe DS |
1321 | ret = -EIO; |
1322 | goto out; | |
1323 | } | |
1324 | ||
1325 | /* are we locked? (ioctl lock) */ | |
1326 | if (s->lock && s->lock != file) { | |
272850f0 | 1327 | dev_dbg(dev->class_dev, "device locked\n"); |
ed9eccbe DS |
1328 | ret = -EACCES; |
1329 | goto out; | |
1330 | } | |
1331 | ||
0fd0ca75 | 1332 | ret = comedi_check_chanlist(s, 1, &insn->chanspec); |
476b8477 | 1333 | if (ret < 0) { |
ed9eccbe | 1334 | ret = -EINVAL; |
272850f0 | 1335 | dev_dbg(dev->class_dev, "bad chanspec\n"); |
ed9eccbe DS |
1336 | goto out; |
1337 | } | |
1338 | ||
1339 | if (s->busy) { | |
1340 | ret = -EBUSY; | |
1341 | goto out; | |
1342 | } | |
1343 | /* This looks arbitrary. It is. */ | |
30cc9bd6 | 1344 | s->busy = parse_insn; |
ed9eccbe DS |
1345 | switch (insn->insn) { |
1346 | case INSN_READ: | |
1347 | ret = s->insn_read(dev, s, insn, data); | |
22ca19d9 HS |
1348 | if (ret == -ETIMEDOUT) { |
1349 | dev_dbg(dev->class_dev, | |
1350 | "subdevice %d read instruction timed out\n", | |
1351 | s->index); | |
1352 | } | |
ed9eccbe DS |
1353 | break; |
1354 | case INSN_WRITE: | |
1355 | maxdata = s->maxdata_list | |
476b8477 GKH |
1356 | ? s->maxdata_list[CR_CHAN(insn->chanspec)] |
1357 | : s->maxdata; | |
ed9eccbe DS |
1358 | for (i = 0; i < insn->n; ++i) { |
1359 | if (data[i] > maxdata) { | |
1360 | ret = -EINVAL; | |
272850f0 HS |
1361 | dev_dbg(dev->class_dev, |
1362 | "bad data value(s)\n"); | |
ed9eccbe DS |
1363 | break; |
1364 | } | |
1365 | } | |
22ca19d9 | 1366 | if (ret == 0) { |
ed9eccbe | 1367 | ret = s->insn_write(dev, s, insn, data); |
22ca19d9 HS |
1368 | if (ret == -ETIMEDOUT) { |
1369 | dev_dbg(dev->class_dev, | |
1370 | "subdevice %d write instruction timed out\n", | |
1371 | s->index); | |
1372 | } | |
1373 | } | |
ed9eccbe DS |
1374 | break; |
1375 | case INSN_BITS: | |
1376 | if (insn->n != 2) { | |
1377 | ret = -EINVAL; | |
2f644ccf | 1378 | } else { |
a2aab8b4 IA |
1379 | /* |
1380 | * Most drivers ignore the base channel in | |
2f644ccf | 1381 | * insn->chanspec. Fix this here if |
a2aab8b4 IA |
1382 | * the subdevice has <= 32 channels. |
1383 | */ | |
36efbacd HS |
1384 | unsigned int orig_mask = data[0]; |
1385 | unsigned int shift = 0; | |
2f644ccf | 1386 | |
2f644ccf IA |
1387 | if (s->n_chan <= 32) { |
1388 | shift = CR_CHAN(insn->chanspec); | |
1389 | if (shift > 0) { | |
1390 | insn->chanspec = 0; | |
1391 | data[0] <<= shift; | |
1392 | data[1] <<= shift; | |
1393 | } | |
36efbacd | 1394 | } |
2f644ccf IA |
1395 | ret = s->insn_bits(dev, s, insn, data); |
1396 | data[0] = orig_mask; | |
1397 | if (shift > 0) | |
1398 | data[1] >>= shift; | |
ed9eccbe | 1399 | } |
ed9eccbe DS |
1400 | break; |
1401 | case INSN_CONFIG: | |
1402 | ret = check_insn_config_length(insn, data); | |
1403 | if (ret) | |
1404 | break; | |
1405 | ret = s->insn_config(dev, s, insn, data); | |
1406 | break; | |
1407 | default: | |
1408 | ret = -EINVAL; | |
1409 | break; | |
1410 | } | |
1411 | ||
1412 | s->busy = NULL; | |
1413 | } | |
1414 | ||
476b8477 | 1415 | out: |
ed9eccbe DS |
1416 | return ret; |
1417 | } | |
1418 | ||
5b6cbd87 | 1419 | /* |
18e01b24 IA |
1420 | * COMEDI_INSNLIST ioctl |
1421 | * synchronous instruction list | |
5b6cbd87 | 1422 | * |
18e01b24 IA |
1423 | * arg: |
1424 | * pointer to comedi_insnlist structure | |
5b6cbd87 | 1425 | * |
18e01b24 IA |
1426 | * reads: |
1427 | * comedi_insnlist structure | |
1428 | * array of comedi_insn structures from insnlist->insns pointer | |
1429 | * data (for writes) from insns[].data pointers | |
5b6cbd87 | 1430 | * |
18e01b24 IA |
1431 | * writes: |
1432 | * data (for reads) to insns[].data pointers | |
5b6cbd87 HS |
1433 | */ |
1434 | /* arbitrary limits */ | |
1435 | #define MAX_SAMPLES 256 | |
1436 | static int do_insnlist_ioctl(struct comedi_device *dev, | |
1437 | struct comedi_insnlist __user *arg, void *file) | |
1438 | { | |
1439 | struct comedi_insnlist insnlist; | |
1440 | struct comedi_insn *insns = NULL; | |
1441 | unsigned int *data = NULL; | |
1442 | int i = 0; | |
1443 | int ret = 0; | |
1444 | ||
1445 | if (copy_from_user(&insnlist, arg, sizeof(insnlist))) | |
1446 | return -EFAULT; | |
1447 | ||
f4a8f528 | 1448 | data = kmalloc_array(MAX_SAMPLES, sizeof(unsigned int), GFP_KERNEL); |
5b6cbd87 | 1449 | if (!data) { |
5b6cbd87 HS |
1450 | ret = -ENOMEM; |
1451 | goto error; | |
1452 | } | |
1453 | ||
1454 | insns = kcalloc(insnlist.n_insns, sizeof(*insns), GFP_KERNEL); | |
1455 | if (!insns) { | |
5b6cbd87 HS |
1456 | ret = -ENOMEM; |
1457 | goto error; | |
1458 | } | |
1459 | ||
1460 | if (copy_from_user(insns, insnlist.insns, | |
1461 | sizeof(*insns) * insnlist.n_insns)) { | |
272850f0 | 1462 | dev_dbg(dev->class_dev, "copy_from_user failed\n"); |
5b6cbd87 HS |
1463 | ret = -EFAULT; |
1464 | goto error; | |
1465 | } | |
1466 | ||
1467 | for (i = 0; i < insnlist.n_insns; i++) { | |
1468 | if (insns[i].n > MAX_SAMPLES) { | |
272850f0 HS |
1469 | dev_dbg(dev->class_dev, |
1470 | "number of samples too large\n"); | |
5b6cbd87 HS |
1471 | ret = -EINVAL; |
1472 | goto error; | |
1473 | } | |
1474 | if (insns[i].insn & INSN_MASK_WRITE) { | |
1475 | if (copy_from_user(data, insns[i].data, | |
1476 | insns[i].n * sizeof(unsigned int))) { | |
272850f0 HS |
1477 | dev_dbg(dev->class_dev, |
1478 | "copy_from_user failed\n"); | |
5b6cbd87 HS |
1479 | ret = -EFAULT; |
1480 | goto error; | |
1481 | } | |
1482 | } | |
1483 | ret = parse_insn(dev, insns + i, data, file); | |
1484 | if (ret < 0) | |
1485 | goto error; | |
1486 | if (insns[i].insn & INSN_MASK_READ) { | |
1487 | if (copy_to_user(insns[i].data, data, | |
1488 | insns[i].n * sizeof(unsigned int))) { | |
272850f0 HS |
1489 | dev_dbg(dev->class_dev, |
1490 | "copy_to_user failed\n"); | |
5b6cbd87 HS |
1491 | ret = -EFAULT; |
1492 | goto error; | |
1493 | } | |
1494 | } | |
1495 | if (need_resched()) | |
1496 | schedule(); | |
1497 | } | |
1498 | ||
1499 | error: | |
1500 | kfree(insns); | |
1501 | kfree(data); | |
1502 | ||
1503 | if (ret < 0) | |
1504 | return ret; | |
1505 | return i; | |
1506 | } | |
1507 | ||
ed9eccbe | 1508 | /* |
18e01b24 IA |
1509 | * COMEDI_INSN ioctl |
1510 | * synchronous instruction | |
ed9eccbe | 1511 | * |
18e01b24 IA |
1512 | * arg: |
1513 | * pointer to comedi_insn structure | |
ed9eccbe | 1514 | * |
18e01b24 IA |
1515 | * reads: |
1516 | * comedi_insn structure | |
1517 | * data (for writes) from insn->data pointer | |
ed9eccbe | 1518 | * |
18e01b24 IA |
1519 | * writes: |
1520 | * data (for reads) to insn->data pointer | |
ed9eccbe | 1521 | */ |
92d0127c GKH |
1522 | static int do_insn_ioctl(struct comedi_device *dev, |
1523 | struct comedi_insn __user *arg, void *file) | |
ed9eccbe | 1524 | { |
90035c08 | 1525 | struct comedi_insn insn; |
790c5541 | 1526 | unsigned int *data = NULL; |
ed9eccbe DS |
1527 | int ret = 0; |
1528 | ||
f4a8f528 | 1529 | data = kmalloc_array(MAX_SAMPLES, sizeof(unsigned int), GFP_KERNEL); |
ed9eccbe DS |
1530 | if (!data) { |
1531 | ret = -ENOMEM; | |
1532 | goto error; | |
1533 | } | |
1534 | ||
bc252fd1 | 1535 | if (copy_from_user(&insn, arg, sizeof(insn))) { |
ed9eccbe DS |
1536 | ret = -EFAULT; |
1537 | goto error; | |
1538 | } | |
1539 | ||
1540 | /* This is where the behavior of insn and insnlist deviate. */ | |
1541 | if (insn.n > MAX_SAMPLES) | |
1542 | insn.n = MAX_SAMPLES; | |
1543 | if (insn.insn & INSN_MASK_WRITE) { | |
21fe2eea M |
1544 | if (copy_from_user(data, |
1545 | insn.data, | |
1546 | insn.n * sizeof(unsigned int))) { | |
ed9eccbe DS |
1547 | ret = -EFAULT; |
1548 | goto error; | |
1549 | } | |
1550 | } | |
1551 | ret = parse_insn(dev, &insn, data, file); | |
1552 | if (ret < 0) | |
1553 | goto error; | |
1554 | if (insn.insn & INSN_MASK_READ) { | |
21fe2eea M |
1555 | if (copy_to_user(insn.data, |
1556 | data, | |
1557 | insn.n * sizeof(unsigned int))) { | |
ed9eccbe DS |
1558 | ret = -EFAULT; |
1559 | goto error; | |
1560 | } | |
1561 | } | |
1562 | ret = insn.n; | |
1563 | ||
476b8477 GKH |
1564 | error: |
1565 | kfree(data); | |
ed9eccbe DS |
1566 | |
1567 | return ret; | |
1568 | } | |
1569 | ||
87ece583 HS |
1570 | static int __comedi_get_user_cmd(struct comedi_device *dev, |
1571 | struct comedi_cmd __user *arg, | |
1572 | struct comedi_cmd *cmd) | |
ed9eccbe | 1573 | { |
34c43922 | 1574 | struct comedi_subdevice *s; |
ed9eccbe | 1575 | |
87ece583 | 1576 | if (copy_from_user(cmd, arg, sizeof(*cmd))) { |
272850f0 | 1577 | dev_dbg(dev->class_dev, "bad cmd address\n"); |
ed9eccbe DS |
1578 | return -EFAULT; |
1579 | } | |
ed9eccbe | 1580 | |
87ece583 HS |
1581 | if (cmd->subdev >= dev->n_subdevices) { |
1582 | dev_dbg(dev->class_dev, "%d no such subdevice\n", cmd->subdev); | |
ed9eccbe DS |
1583 | return -ENODEV; |
1584 | } | |
1585 | ||
87ece583 | 1586 | s = &dev->subdevices[cmd->subdev]; |
ed9eccbe DS |
1587 | |
1588 | if (s->type == COMEDI_SUBD_UNUSED) { | |
b2f48741 YD |
1589 | dev_dbg(dev->class_dev, "%d not valid subdevice\n", |
1590 | cmd->subdev); | |
ed9eccbe DS |
1591 | return -EIO; |
1592 | } | |
1593 | ||
1594 | if (!s->do_cmd || !s->do_cmdtest || !s->async) { | |
272850f0 | 1595 | dev_dbg(dev->class_dev, |
b2f48741 YD |
1596 | "subdevice %d does not support commands\n", |
1597 | cmd->subdev); | |
ed9eccbe DS |
1598 | return -EIO; |
1599 | } | |
1600 | ||
87ece583 HS |
1601 | /* make sure channel/gain list isn't too long */ |
1602 | if (cmd->chanlist_len > s->len_chanlist) { | |
1603 | dev_dbg(dev->class_dev, "channel/gain list too long %d > %d\n", | |
1604 | cmd->chanlist_len, s->len_chanlist); | |
1605 | return -EINVAL; | |
1606 | } | |
1607 | ||
5d070cf2 IA |
1608 | /* |
1609 | * Set the CMDF_WRITE flag to the correct state if the subdevice | |
1610 | * supports only "read" commands or only "write" commands. | |
1611 | */ | |
1612 | switch (s->subdev_flags & (SDF_CMD_READ | SDF_CMD_WRITE)) { | |
1613 | case SDF_CMD_READ: | |
1614 | cmd->flags &= ~CMDF_WRITE; | |
1615 | break; | |
1616 | case SDF_CMD_WRITE: | |
1617 | cmd->flags |= CMDF_WRITE; | |
1618 | break; | |
1619 | default: | |
1620 | break; | |
1621 | } | |
1622 | ||
87ece583 HS |
1623 | return 0; |
1624 | } | |
1625 | ||
c6cd0eef HS |
1626 | static int __comedi_get_user_chanlist(struct comedi_device *dev, |
1627 | struct comedi_subdevice *s, | |
1628 | unsigned int __user *user_chanlist, | |
1629 | struct comedi_cmd *cmd) | |
1630 | { | |
1631 | unsigned int *chanlist; | |
1632 | int ret; | |
1633 | ||
238b5ad8 | 1634 | cmd->chanlist = NULL; |
c6cd0eef HS |
1635 | chanlist = memdup_user(user_chanlist, |
1636 | cmd->chanlist_len * sizeof(unsigned int)); | |
1637 | if (IS_ERR(chanlist)) | |
1638 | return PTR_ERR(chanlist); | |
1639 | ||
1640 | /* make sure each element in channel/gain list is valid */ | |
1641 | ret = comedi_check_chanlist(s, cmd->chanlist_len, chanlist); | |
1642 | if (ret < 0) { | |
1643 | kfree(chanlist); | |
1644 | return ret; | |
1645 | } | |
1646 | ||
1647 | cmd->chanlist = chanlist; | |
1648 | ||
1649 | return 0; | |
1650 | } | |
1651 | ||
18e01b24 IA |
1652 | /* |
1653 | * COMEDI_CMD ioctl | |
1654 | * asynchronous acquisition command set-up | |
1655 | * | |
1656 | * arg: | |
1657 | * pointer to comedi_cmd structure | |
1658 | * | |
1659 | * reads: | |
1660 | * comedi_cmd structure | |
1661 | * channel/range list from cmd->chanlist pointer | |
1662 | * | |
1663 | * writes: | |
1664 | * possibly modified comedi_cmd structure (when -EAGAIN returned) | |
1665 | */ | |
87ece583 HS |
1666 | static int do_cmd_ioctl(struct comedi_device *dev, |
1667 | struct comedi_cmd __user *arg, void *file) | |
1668 | { | |
1669 | struct comedi_cmd cmd; | |
1670 | struct comedi_subdevice *s; | |
1671 | struct comedi_async *async; | |
1672 | unsigned int __user *user_chanlist; | |
1673 | int ret; | |
1674 | ||
1675 | /* get the user's cmd and do some simple validation */ | |
1676 | ret = __comedi_get_user_cmd(dev, arg, &cmd); | |
1677 | if (ret) | |
1678 | return ret; | |
1679 | ||
1680 | /* save user's chanlist pointer so it can be restored later */ | |
1681 | user_chanlist = (unsigned int __user *)cmd.chanlist; | |
1682 | ||
1683 | s = &dev->subdevices[cmd.subdev]; | |
1684 | async = s->async; | |
1685 | ||
ed9eccbe DS |
1686 | /* are we locked? (ioctl lock) */ |
1687 | if (s->lock && s->lock != file) { | |
272850f0 | 1688 | dev_dbg(dev->class_dev, "subdevice locked\n"); |
ed9eccbe DS |
1689 | return -EACCES; |
1690 | } | |
1691 | ||
1692 | /* are we busy? */ | |
1693 | if (s->busy) { | |
272850f0 | 1694 | dev_dbg(dev->class_dev, "subdevice busy\n"); |
ed9eccbe DS |
1695 | return -EBUSY; |
1696 | } | |
ed9eccbe | 1697 | |
ed9eccbe | 1698 | /* make sure channel/gain list isn't too short */ |
88bc0574 | 1699 | if (cmd.chanlist_len < 1) { |
272850f0 | 1700 | dev_dbg(dev->class_dev, "channel/gain list too short %u < 1\n", |
88bc0574 | 1701 | cmd.chanlist_len); |
4b18f08b | 1702 | return -EINVAL; |
ed9eccbe DS |
1703 | } |
1704 | ||
88bc0574 | 1705 | async->cmd = cmd; |
ed9eccbe | 1706 | async->cmd.data = NULL; |
ed9eccbe | 1707 | |
c6cd0eef HS |
1708 | /* load channel/gain list */ |
1709 | ret = __comedi_get_user_chanlist(dev, s, user_chanlist, &async->cmd); | |
1710 | if (ret) | |
ed9eccbe | 1711 | goto cleanup; |
ed9eccbe DS |
1712 | |
1713 | ret = s->do_cmdtest(dev, s, &async->cmd); | |
1714 | ||
b0446a21 | 1715 | if (async->cmd.flags & CMDF_BOGUS || ret) { |
272850f0 | 1716 | dev_dbg(dev->class_dev, "test returned %d\n", ret); |
88bc0574 | 1717 | cmd = async->cmd; |
476b8477 | 1718 | /* restore chanlist pointer before copying back */ |
95bc359f | 1719 | cmd.chanlist = (unsigned int __force *)user_chanlist; |
88bc0574 | 1720 | cmd.data = NULL; |
bc252fd1 | 1721 | if (copy_to_user(arg, &cmd, sizeof(cmd))) { |
272850f0 | 1722 | dev_dbg(dev->class_dev, "fault writing cmd\n"); |
ed9eccbe DS |
1723 | ret = -EFAULT; |
1724 | goto cleanup; | |
1725 | } | |
1726 | ret = -EAGAIN; | |
1727 | goto cleanup; | |
1728 | } | |
1729 | ||
1730 | if (!async->prealloc_bufsz) { | |
1731 | ret = -ENOMEM; | |
272850f0 | 1732 | dev_dbg(dev->class_dev, "no buffer (?)\n"); |
ed9eccbe DS |
1733 | goto cleanup; |
1734 | } | |
1735 | ||
fcc18a9a | 1736 | comedi_buf_reset(s); |
ed9eccbe | 1737 | |
781f933c | 1738 | async->cb_mask = COMEDI_CB_BLOCK | COMEDI_CB_CANCEL_MASK; |
d8bff6e3 | 1739 | if (async->cmd.flags & CMDF_WAKE_EOS) |
ed9eccbe | 1740 | async->cb_mask |= COMEDI_CB_EOS; |
ed9eccbe | 1741 | |
cc64ea42 IA |
1742 | comedi_update_subdevice_runflags(s, COMEDI_SRF_BUSY_MASK, |
1743 | COMEDI_SRF_RUNNING); | |
ed9eccbe | 1744 | |
84bb0bcc HS |
1745 | /* |
1746 | * Set s->busy _after_ setting COMEDI_SRF_RUNNING flag to avoid | |
1747 | * race with comedi_read() or comedi_write(). | |
1748 | */ | |
4b18f08b | 1749 | s->busy = file; |
ed9eccbe DS |
1750 | ret = s->do_cmd(dev, s); |
1751 | if (ret == 0) | |
1752 | return 0; | |
1753 | ||
476b8477 | 1754 | cleanup: |
ed9eccbe DS |
1755 | do_become_nonbusy(dev, s); |
1756 | ||
1757 | return ret; | |
1758 | } | |
1759 | ||
1760 | /* | |
18e01b24 | 1761 | * COMEDI_CMDTEST ioctl |
69e98df7 | 1762 | * asynchronous acquisition command testing |
18e01b24 IA |
1763 | * |
1764 | * arg: | |
1765 | * pointer to comedi_cmd structure | |
1766 | * | |
1767 | * reads: | |
1768 | * comedi_cmd structure | |
1769 | * channel/range list from cmd->chanlist pointer | |
1770 | * | |
1771 | * writes: | |
1772 | * possibly modified comedi_cmd structure | |
1773 | */ | |
92d0127c GKH |
1774 | static int do_cmdtest_ioctl(struct comedi_device *dev, |
1775 | struct comedi_cmd __user *arg, void *file) | |
ed9eccbe | 1776 | { |
f8348677 | 1777 | struct comedi_cmd cmd; |
34c43922 | 1778 | struct comedi_subdevice *s; |
95bc359f | 1779 | unsigned int __user *user_chanlist; |
87ece583 HS |
1780 | int ret; |
1781 | ||
1782 | /* get the user's cmd and do some simple validation */ | |
1783 | ret = __comedi_get_user_cmd(dev, arg, &cmd); | |
1784 | if (ret) | |
1785 | return ret; | |
ed9eccbe | 1786 | |
476b8477 | 1787 | /* save user's chanlist pointer so it can be restored later */ |
95bc359f | 1788 | user_chanlist = (unsigned int __user *)cmd.chanlist; |
ed9eccbe | 1789 | |
f8348677 | 1790 | s = &dev->subdevices[cmd.subdev]; |
ed9eccbe | 1791 | |
6cab7a37 IA |
1792 | /* user_chanlist can be NULL for COMEDI_CMDTEST ioctl */ |
1793 | if (user_chanlist) { | |
1794 | /* load channel/gain list */ | |
1795 | ret = __comedi_get_user_chanlist(dev, s, user_chanlist, &cmd); | |
1796 | if (ret) | |
1797 | return ret; | |
1798 | } | |
ed9eccbe | 1799 | |
f8348677 | 1800 | ret = s->do_cmdtest(dev, s, &cmd); |
ed9eccbe | 1801 | |
238b5ad8 IA |
1802 | kfree(cmd.chanlist); /* free kernel copy of user chanlist */ |
1803 | ||
476b8477 | 1804 | /* restore chanlist pointer before copying back */ |
95bc359f | 1805 | cmd.chanlist = (unsigned int __force *)user_chanlist; |
ed9eccbe | 1806 | |
bc252fd1 | 1807 | if (copy_to_user(arg, &cmd, sizeof(cmd))) { |
272850f0 | 1808 | dev_dbg(dev->class_dev, "bad cmd address\n"); |
ed9eccbe | 1809 | ret = -EFAULT; |
ed9eccbe | 1810 | } |
c6cd0eef | 1811 | |
ed9eccbe DS |
1812 | return ret; |
1813 | } | |
1814 | ||
1815 | /* | |
18e01b24 IA |
1816 | * COMEDI_LOCK ioctl |
1817 | * lock subdevice | |
1818 | * | |
1819 | * arg: | |
1820 | * subdevice number | |
1821 | * | |
1822 | * reads: | |
1823 | * nothing | |
1824 | * | |
1825 | * writes: | |
1826 | * nothing | |
1827 | */ | |
c1a6eac1 | 1828 | static int do_lock_ioctl(struct comedi_device *dev, unsigned long arg, |
0a85b6f0 | 1829 | void *file) |
ed9eccbe DS |
1830 | { |
1831 | int ret = 0; | |
1832 | unsigned long flags; | |
34c43922 | 1833 | struct comedi_subdevice *s; |
ed9eccbe DS |
1834 | |
1835 | if (arg >= dev->n_subdevices) | |
1836 | return -EINVAL; | |
b077f2cd | 1837 | s = &dev->subdevices[arg]; |
ed9eccbe | 1838 | |
5f74ea14 | 1839 | spin_lock_irqsave(&s->spin_lock, flags); |
476b8477 | 1840 | if (s->busy || s->lock) |
ed9eccbe | 1841 | ret = -EBUSY; |
476b8477 | 1842 | else |
ed9eccbe | 1843 | s->lock = file; |
5f74ea14 | 1844 | spin_unlock_irqrestore(&s->spin_lock, flags); |
ed9eccbe | 1845 | |
ed9eccbe DS |
1846 | return ret; |
1847 | } | |
1848 | ||
1849 | /* | |
18e01b24 IA |
1850 | * COMEDI_UNLOCK ioctl |
1851 | * unlock subdevice | |
1852 | * | |
1853 | * arg: | |
1854 | * subdevice number | |
1855 | * | |
1856 | * reads: | |
1857 | * nothing | |
1858 | * | |
1859 | * writes: | |
1860 | * nothing | |
1861 | */ | |
c1a6eac1 | 1862 | static int do_unlock_ioctl(struct comedi_device *dev, unsigned long arg, |
0a85b6f0 | 1863 | void *file) |
ed9eccbe | 1864 | { |
34c43922 | 1865 | struct comedi_subdevice *s; |
ed9eccbe DS |
1866 | |
1867 | if (arg >= dev->n_subdevices) | |
1868 | return -EINVAL; | |
b077f2cd | 1869 | s = &dev->subdevices[arg]; |
ed9eccbe DS |
1870 | |
1871 | if (s->busy) | |
1872 | return -EBUSY; | |
1873 | ||
1874 | if (s->lock && s->lock != file) | |
1875 | return -EACCES; | |
1876 | ||
90ac0764 | 1877 | if (s->lock == file) |
ed9eccbe | 1878 | s->lock = NULL; |
ed9eccbe DS |
1879 | |
1880 | return 0; | |
1881 | } | |
1882 | ||
1883 | /* | |
18e01b24 IA |
1884 | * COMEDI_CANCEL ioctl |
1885 | * cancel asynchronous acquisition | |
1886 | * | |
1887 | * arg: | |
1888 | * subdevice number | |
1889 | * | |
1890 | * reads: | |
1891 | * nothing | |
1892 | * | |
1893 | * writes: | |
1894 | * nothing | |
1895 | */ | |
c1a6eac1 | 1896 | static int do_cancel_ioctl(struct comedi_device *dev, unsigned long arg, |
0a85b6f0 | 1897 | void *file) |
ed9eccbe | 1898 | { |
34c43922 | 1899 | struct comedi_subdevice *s; |
ed9eccbe DS |
1900 | |
1901 | if (arg >= dev->n_subdevices) | |
1902 | return -EINVAL; | |
b077f2cd | 1903 | s = &dev->subdevices[arg]; |
88cc30cf | 1904 | if (!s->async) |
ed9eccbe DS |
1905 | return -EINVAL; |
1906 | ||
ed9eccbe DS |
1907 | if (!s->busy) |
1908 | return 0; | |
1909 | ||
1910 | if (s->busy != file) | |
1911 | return -EBUSY; | |
1912 | ||
fe43ec53 | 1913 | return do_cancel(dev, s); |
ed9eccbe DS |
1914 | } |
1915 | ||
1916 | /* | |
18e01b24 IA |
1917 | * COMEDI_POLL ioctl |
1918 | * instructs driver to synchronize buffers | |
1919 | * | |
1920 | * arg: | |
1921 | * subdevice number | |
1922 | * | |
1923 | * reads: | |
1924 | * nothing | |
1925 | * | |
1926 | * writes: | |
1927 | * nothing | |
1928 | */ | |
c1a6eac1 | 1929 | static int do_poll_ioctl(struct comedi_device *dev, unsigned long arg, |
0a85b6f0 | 1930 | void *file) |
ed9eccbe | 1931 | { |
34c43922 | 1932 | struct comedi_subdevice *s; |
ed9eccbe DS |
1933 | |
1934 | if (arg >= dev->n_subdevices) | |
1935 | return -EINVAL; | |
b077f2cd | 1936 | s = &dev->subdevices[arg]; |
ed9eccbe | 1937 | |
ed9eccbe DS |
1938 | if (!s->busy) |
1939 | return 0; | |
1940 | ||
1941 | if (s->busy != file) | |
1942 | return -EBUSY; | |
1943 | ||
1944 | if (s->poll) | |
1945 | return s->poll(dev, s); | |
1946 | ||
1947 | return -EINVAL; | |
1948 | } | |
1949 | ||
c299a678 IA |
1950 | /* |
1951 | * COMEDI_SETRSUBD ioctl | |
1952 | * sets the current "read" subdevice on a per-file basis | |
1953 | * | |
1954 | * arg: | |
1955 | * subdevice number | |
1956 | * | |
1957 | * reads: | |
1958 | * nothing | |
1959 | * | |
1960 | * writes: | |
1961 | * nothing | |
1962 | */ | |
1963 | static int do_setrsubd_ioctl(struct comedi_device *dev, unsigned long arg, | |
1964 | struct file *file) | |
1965 | { | |
1966 | struct comedi_file *cfp = file->private_data; | |
1967 | struct comedi_subdevice *s_old, *s_new; | |
1968 | ||
1969 | if (arg >= dev->n_subdevices) | |
1970 | return -EINVAL; | |
1971 | ||
1972 | s_new = &dev->subdevices[arg]; | |
1973 | s_old = comedi_file_read_subdevice(file); | |
1974 | if (s_old == s_new) | |
1975 | return 0; /* no change */ | |
1976 | ||
1977 | if (!(s_new->subdev_flags & SDF_CMD_READ)) | |
1978 | return -EINVAL; | |
1979 | ||
1980 | /* | |
1981 | * Check the file isn't still busy handling a "read" command on the | |
1982 | * old subdevice (if any). | |
1983 | */ | |
1984 | if (s_old && s_old->busy == file && s_old->async && | |
1985 | !(s_old->async->cmd.flags & CMDF_WRITE)) | |
1986 | return -EBUSY; | |
1987 | ||
1988 | ACCESS_ONCE(cfp->read_subdev) = s_new; | |
1989 | return 0; | |
1990 | } | |
1991 | ||
1992 | /* | |
1993 | * COMEDI_SETWSUBD ioctl | |
1994 | * sets the current "write" subdevice on a per-file basis | |
1995 | * | |
1996 | * arg: | |
1997 | * subdevice number | |
1998 | * | |
1999 | * reads: | |
2000 | * nothing | |
2001 | * | |
2002 | * writes: | |
2003 | * nothing | |
2004 | */ | |
2005 | static int do_setwsubd_ioctl(struct comedi_device *dev, unsigned long arg, | |
2006 | struct file *file) | |
2007 | { | |
2008 | struct comedi_file *cfp = file->private_data; | |
2009 | struct comedi_subdevice *s_old, *s_new; | |
2010 | ||
2011 | if (arg >= dev->n_subdevices) | |
2012 | return -EINVAL; | |
2013 | ||
2014 | s_new = &dev->subdevices[arg]; | |
2015 | s_old = comedi_file_write_subdevice(file); | |
2016 | if (s_old == s_new) | |
2017 | return 0; /* no change */ | |
2018 | ||
2019 | if (!(s_new->subdev_flags & SDF_CMD_WRITE)) | |
2020 | return -EINVAL; | |
2021 | ||
2022 | /* | |
2023 | * Check the file isn't still busy handling a "write" command on the | |
2024 | * old subdevice (if any). | |
2025 | */ | |
2026 | if (s_old && s_old->busy == file && s_old->async && | |
2027 | (s_old->async->cmd.flags & CMDF_WRITE)) | |
2028 | return -EBUSY; | |
2029 | ||
2030 | ACCESS_ONCE(cfp->write_subdev) = s_new; | |
2031 | return 0; | |
2032 | } | |
2033 | ||
47db6d58 HS |
2034 | static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd, |
2035 | unsigned long arg) | |
2036 | { | |
20f083c0 IA |
2037 | unsigned minor = iminor(file_inode(file)); |
2038 | struct comedi_file *cfp = file->private_data; | |
2039 | struct comedi_device *dev = cfp->dev; | |
47db6d58 HS |
2040 | int rc; |
2041 | ||
47db6d58 HS |
2042 | mutex_lock(&dev->mutex); |
2043 | ||
a2aab8b4 IA |
2044 | /* |
2045 | * Device config is special, because it must work on | |
2046 | * an unconfigured device. | |
2047 | */ | |
47db6d58 | 2048 | if (cmd == COMEDI_DEVCONFIG) { |
754ab5c0 IA |
2049 | if (minor >= COMEDI_NUM_BOARD_MINORS) { |
2050 | /* Device config not appropriate on non-board minors. */ | |
2051 | rc = -ENOTTY; | |
2052 | goto done; | |
2053 | } | |
47db6d58 HS |
2054 | rc = do_devconfig_ioctl(dev, |
2055 | (struct comedi_devconfig __user *)arg); | |
8ab4ed6e IA |
2056 | if (rc == 0) { |
2057 | if (arg == 0 && | |
2058 | dev->minor >= comedi_num_legacy_minors) { | |
a2aab8b4 IA |
2059 | /* |
2060 | * Successfully unconfigured a dynamically | |
2061 | * allocated device. Try and remove it. | |
2062 | */ | |
db210da2 | 2063 | if (comedi_clear_board_dev(dev)) { |
8ab4ed6e | 2064 | mutex_unlock(&dev->mutex); |
cb6b79de | 2065 | comedi_free_board_dev(dev); |
8ab4ed6e IA |
2066 | return rc; |
2067 | } | |
2068 | } | |
2069 | } | |
47db6d58 HS |
2070 | goto done; |
2071 | } | |
2072 | ||
2073 | if (!dev->attached) { | |
272850f0 | 2074 | dev_dbg(dev->class_dev, "no driver attached\n"); |
47db6d58 HS |
2075 | rc = -ENODEV; |
2076 | goto done; | |
2077 | } | |
2078 | ||
2079 | switch (cmd) { | |
2080 | case COMEDI_BUFCONFIG: | |
2081 | rc = do_bufconfig_ioctl(dev, | |
2082 | (struct comedi_bufconfig __user *)arg); | |
2083 | break; | |
2084 | case COMEDI_DEVINFO: | |
2085 | rc = do_devinfo_ioctl(dev, (struct comedi_devinfo __user *)arg, | |
2086 | file); | |
2087 | break; | |
2088 | case COMEDI_SUBDINFO: | |
2089 | rc = do_subdinfo_ioctl(dev, | |
2090 | (struct comedi_subdinfo __user *)arg, | |
2091 | file); | |
2092 | break; | |
2093 | case COMEDI_CHANINFO: | |
2094 | rc = do_chaninfo_ioctl(dev, (void __user *)arg); | |
2095 | break; | |
2096 | case COMEDI_RANGEINFO: | |
2097 | rc = do_rangeinfo_ioctl(dev, (void __user *)arg); | |
2098 | break; | |
2099 | case COMEDI_BUFINFO: | |
2100 | rc = do_bufinfo_ioctl(dev, | |
2101 | (struct comedi_bufinfo __user *)arg, | |
2102 | file); | |
2103 | break; | |
2104 | case COMEDI_LOCK: | |
2105 | rc = do_lock_ioctl(dev, arg, file); | |
2106 | break; | |
2107 | case COMEDI_UNLOCK: | |
2108 | rc = do_unlock_ioctl(dev, arg, file); | |
2109 | break; | |
2110 | case COMEDI_CANCEL: | |
2111 | rc = do_cancel_ioctl(dev, arg, file); | |
2112 | break; | |
2113 | case COMEDI_CMD: | |
2114 | rc = do_cmd_ioctl(dev, (struct comedi_cmd __user *)arg, file); | |
2115 | break; | |
2116 | case COMEDI_CMDTEST: | |
2117 | rc = do_cmdtest_ioctl(dev, (struct comedi_cmd __user *)arg, | |
2118 | file); | |
2119 | break; | |
2120 | case COMEDI_INSNLIST: | |
2121 | rc = do_insnlist_ioctl(dev, | |
2122 | (struct comedi_insnlist __user *)arg, | |
2123 | file); | |
2124 | break; | |
2125 | case COMEDI_INSN: | |
2126 | rc = do_insn_ioctl(dev, (struct comedi_insn __user *)arg, | |
2127 | file); | |
2128 | break; | |
2129 | case COMEDI_POLL: | |
2130 | rc = do_poll_ioctl(dev, arg, file); | |
2131 | break; | |
c299a678 IA |
2132 | case COMEDI_SETRSUBD: |
2133 | rc = do_setrsubd_ioctl(dev, arg, file); | |
2134 | break; | |
2135 | case COMEDI_SETWSUBD: | |
2136 | rc = do_setwsubd_ioctl(dev, arg, file); | |
2137 | break; | |
47db6d58 HS |
2138 | default: |
2139 | rc = -ENOTTY; | |
2140 | break; | |
2141 | } | |
2142 | ||
2143 | done: | |
2144 | mutex_unlock(&dev->mutex); | |
2145 | return rc; | |
2146 | } | |
2147 | ||
df30b21c FV |
2148 | static void comedi_vm_open(struct vm_area_struct *area) |
2149 | { | |
af93da31 | 2150 | struct comedi_buf_map *bm; |
df30b21c | 2151 | |
af93da31 IA |
2152 | bm = area->vm_private_data; |
2153 | comedi_buf_map_get(bm); | |
df30b21c FV |
2154 | } |
2155 | ||
2156 | static void comedi_vm_close(struct vm_area_struct *area) | |
ed9eccbe | 2157 | { |
af93da31 | 2158 | struct comedi_buf_map *bm; |
ed9eccbe | 2159 | |
af93da31 IA |
2160 | bm = area->vm_private_data; |
2161 | comedi_buf_map_put(bm); | |
ed9eccbe DS |
2162 | } |
2163 | ||
7cbea8dc | 2164 | static const struct vm_operations_struct comedi_vm_ops = { |
df30b21c FV |
2165 | .open = comedi_vm_open, |
2166 | .close = comedi_vm_close, | |
ed9eccbe DS |
2167 | }; |
2168 | ||
2169 | static int comedi_mmap(struct file *file, struct vm_area_struct *vma) | |
2170 | { | |
20f083c0 IA |
2171 | struct comedi_file *cfp = file->private_data; |
2172 | struct comedi_device *dev = cfp->dev; | |
a52840a9 HS |
2173 | struct comedi_subdevice *s; |
2174 | struct comedi_async *async; | |
b34aa86f | 2175 | struct comedi_buf_map *bm = NULL; |
ed9eccbe DS |
2176 | unsigned long start = vma->vm_start; |
2177 | unsigned long size; | |
2178 | int n_pages; | |
2179 | int i; | |
2180 | int retval; | |
3ffab428 | 2181 | |
b34aa86f IA |
2182 | /* |
2183 | * 'trylock' avoids circular dependency with current->mm->mmap_sem | |
2184 | * and down-reading &dev->attach_lock should normally succeed without | |
2185 | * contention unless the device is in the process of being attached | |
2186 | * or detached. | |
2187 | */ | |
2188 | if (!down_read_trylock(&dev->attach_lock)) | |
2189 | return -EAGAIN; | |
a52840a9 | 2190 | |
ed9eccbe | 2191 | if (!dev->attached) { |
272850f0 | 2192 | dev_dbg(dev->class_dev, "no driver attached\n"); |
ed9eccbe DS |
2193 | retval = -ENODEV; |
2194 | goto done; | |
2195 | } | |
a52840a9 | 2196 | |
476b8477 | 2197 | if (vma->vm_flags & VM_WRITE) |
20f083c0 | 2198 | s = comedi_file_write_subdevice(file); |
476b8477 | 2199 | else |
20f083c0 | 2200 | s = comedi_file_read_subdevice(file); |
a52840a9 | 2201 | if (!s) { |
ed9eccbe DS |
2202 | retval = -EINVAL; |
2203 | goto done; | |
2204 | } | |
a52840a9 | 2205 | |
ed9eccbe | 2206 | async = s->async; |
a52840a9 | 2207 | if (!async) { |
ed9eccbe DS |
2208 | retval = -EINVAL; |
2209 | goto done; | |
2210 | } | |
2211 | ||
2212 | if (vma->vm_pgoff != 0) { | |
272850f0 | 2213 | dev_dbg(dev->class_dev, "mmap() offset must be 0.\n"); |
ed9eccbe DS |
2214 | retval = -EINVAL; |
2215 | goto done; | |
2216 | } | |
2217 | ||
2218 | size = vma->vm_end - vma->vm_start; | |
2219 | if (size > async->prealloc_bufsz) { | |
2220 | retval = -EFAULT; | |
2221 | goto done; | |
2222 | } | |
2223 | if (size & (~PAGE_MASK)) { | |
2224 | retval = -EFAULT; | |
2225 | goto done; | |
2226 | } | |
2227 | ||
2228 | n_pages = size >> PAGE_SHIFT; | |
b34aa86f IA |
2229 | |
2230 | /* get reference to current buf map (if any) */ | |
2231 | bm = comedi_buf_map_from_subdev_get(s); | |
af93da31 IA |
2232 | if (!bm || n_pages > bm->n_pages) { |
2233 | retval = -EINVAL; | |
2234 | goto done; | |
2235 | } | |
ed9eccbe | 2236 | for (i = 0; i < n_pages; ++i) { |
af93da31 | 2237 | struct comedi_buf_page *buf = &bm->page_list[i]; |
a52840a9 | 2238 | |
ed9eccbe | 2239 | if (remap_pfn_range(vma, start, |
a52840a9 HS |
2240 | page_to_pfn(virt_to_page(buf->virt_addr)), |
2241 | PAGE_SIZE, PAGE_SHARED)) { | |
ed9eccbe DS |
2242 | retval = -EAGAIN; |
2243 | goto done; | |
2244 | } | |
2245 | start += PAGE_SIZE; | |
2246 | } | |
2247 | ||
2248 | vma->vm_ops = &comedi_vm_ops; | |
af93da31 | 2249 | vma->vm_private_data = bm; |
ed9eccbe | 2250 | |
af93da31 | 2251 | vma->vm_ops->open(vma); |
ed9eccbe DS |
2252 | |
2253 | retval = 0; | |
476b8477 | 2254 | done: |
b34aa86f IA |
2255 | up_read(&dev->attach_lock); |
2256 | comedi_buf_map_put(bm); /* put reference to buf map - okay if NULL */ | |
ed9eccbe DS |
2257 | return retval; |
2258 | } | |
2259 | ||
1ae5062a | 2260 | static unsigned int comedi_poll(struct file *file, poll_table *wait) |
ed9eccbe DS |
2261 | { |
2262 | unsigned int mask = 0; | |
20f083c0 IA |
2263 | struct comedi_file *cfp = file->private_data; |
2264 | struct comedi_device *dev = cfp->dev; | |
322146d5 | 2265 | struct comedi_subdevice *s, *s_read; |
3ffab428 | 2266 | |
ed9eccbe | 2267 | mutex_lock(&dev->mutex); |
ca081b1d | 2268 | |
ed9eccbe | 2269 | if (!dev->attached) { |
272850f0 | 2270 | dev_dbg(dev->class_dev, "no driver attached\n"); |
ca081b1d | 2271 | goto done; |
ed9eccbe DS |
2272 | } |
2273 | ||
20f083c0 | 2274 | s = comedi_file_read_subdevice(file); |
322146d5 | 2275 | s_read = s; |
cc400e18 | 2276 | if (s && s->async) { |
ca081b1d | 2277 | poll_wait(file, &s->async->wait_head, wait); |
f0124630 | 2278 | if (!s->busy || !comedi_is_subdevice_running(s) || |
662c722b | 2279 | (s->async->cmd.flags & CMDF_WRITE) || |
e9edef3a | 2280 | comedi_buf_read_n_available(s) > 0) |
ed9eccbe | 2281 | mask |= POLLIN | POLLRDNORM; |
ed9eccbe | 2282 | } |
ca081b1d | 2283 | |
20f083c0 | 2284 | s = comedi_file_write_subdevice(file); |
cc400e18 | 2285 | if (s && s->async) { |
c39e050d | 2286 | unsigned int bps = comedi_bytes_per_sample(s); |
ca081b1d | 2287 | |
322146d5 IA |
2288 | if (s != s_read) |
2289 | poll_wait(file, &s->async->wait_head, wait); | |
24e894bb | 2290 | comedi_buf_write_alloc(s, s->async->prealloc_bufsz); |
f0124630 | 2291 | if (!s->busy || !comedi_is_subdevice_running(s) || |
662c722b | 2292 | !(s->async->cmd.flags & CMDF_WRITE) || |
0f1f34e8 | 2293 | comedi_buf_write_n_allocated(s) >= bps) |
ed9eccbe | 2294 | mask |= POLLOUT | POLLWRNORM; |
ed9eccbe DS |
2295 | } |
2296 | ||
ca081b1d | 2297 | done: |
ed9eccbe DS |
2298 | mutex_unlock(&dev->mutex); |
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; |
ed9eccbe DS |
2307 | int n, m, count = 0, retval = 0; |
2308 | DECLARE_WAITQUEUE(wait, current); | |
20f083c0 IA |
2309 | struct comedi_file *cfp = file->private_data; |
2310 | struct comedi_device *dev = cfp->dev; | |
9329f139 IA |
2311 | bool on_wait_queue = false; |
2312 | bool attach_locked; | |
2313 | unsigned int old_detach_count; | |
3ffab428 | 2314 | |
9329f139 IA |
2315 | /* Protect against device detachment during operation. */ |
2316 | down_read(&dev->attach_lock); | |
2317 | attach_locked = true; | |
2318 | old_detach_count = dev->detach_count; | |
2319 | ||
ed9eccbe | 2320 | if (!dev->attached) { |
272850f0 | 2321 | dev_dbg(dev->class_dev, "no driver attached\n"); |
9329f139 IA |
2322 | retval = -ENODEV; |
2323 | goto out; | |
ed9eccbe DS |
2324 | } |
2325 | ||
20f083c0 | 2326 | s = comedi_file_write_subdevice(file); |
9329f139 IA |
2327 | if (!s || !s->async) { |
2328 | retval = -EIO; | |
2329 | goto out; | |
2330 | } | |
2714b019 | 2331 | |
ed9eccbe DS |
2332 | async = s->async; |
2333 | ||
2714b019 | 2334 | if (!s->busy || !nbytes) |
9329f139 IA |
2335 | goto out; |
2336 | if (s->busy != file) { | |
2337 | retval = -EACCES; | |
2338 | goto out; | |
2339 | } | |
f7398509 IA |
2340 | if (!(async->cmd.flags & CMDF_WRITE)) { |
2341 | retval = -EINVAL; | |
2342 | goto out; | |
2343 | } | |
2714b019 | 2344 | |
ed9eccbe | 2345 | add_wait_queue(&async->wait_head, &wait); |
9329f139 | 2346 | on_wait_queue = true; |
ed9eccbe | 2347 | while (nbytes > 0 && !retval) { |
b183a836 IA |
2348 | unsigned runflags; |
2349 | ||
ed9eccbe DS |
2350 | set_current_state(TASK_INTERRUPTIBLE); |
2351 | ||
b183a836 IA |
2352 | runflags = comedi_get_subdevice_runflags(s); |
2353 | if (!comedi_is_runflags_running(runflags)) { | |
d2611540 | 2354 | if (count == 0) { |
9329f139 IA |
2355 | struct comedi_subdevice *new_s; |
2356 | ||
b183a836 | 2357 | if (comedi_is_runflags_in_error(runflags)) |
d2611540 | 2358 | retval = -EPIPE; |
c098c21a | 2359 | else |
d2611540 | 2360 | retval = 0; |
9329f139 IA |
2361 | /* |
2362 | * To avoid deadlock, cannot acquire dev->mutex | |
2363 | * while dev->attach_lock is held. Need to | |
2364 | * remove task from the async wait queue before | |
2365 | * releasing dev->attach_lock, as it might not | |
2366 | * be valid afterwards. | |
2367 | */ | |
2368 | remove_wait_queue(&async->wait_head, &wait); | |
2369 | on_wait_queue = false; | |
2370 | up_read(&dev->attach_lock); | |
2371 | attach_locked = false; | |
2372 | mutex_lock(&dev->mutex); | |
2373 | /* | |
2374 | * Become non-busy unless things have changed | |
2375 | * behind our back. Checking dev->detach_count | |
2376 | * is unchanged ought to be sufficient (unless | |
2377 | * there have been 2**32 detaches in the | |
2378 | * meantime!), but check the subdevice pointer | |
2379 | * as well just in case. | |
2380 | */ | |
20f083c0 | 2381 | new_s = comedi_file_write_subdevice(file); |
9329f139 IA |
2382 | if (dev->attached && |
2383 | old_detach_count == dev->detach_count && | |
2384 | s == new_s && new_s->async == async) | |
2385 | do_become_nonbusy(dev, s); | |
4b18f08b | 2386 | mutex_unlock(&dev->mutex); |
d2611540 IA |
2387 | } |
2388 | break; | |
2389 | } | |
2390 | ||
ed9eccbe DS |
2391 | n = nbytes; |
2392 | ||
2393 | m = n; | |
476b8477 | 2394 | if (async->buf_write_ptr + m > async->prealloc_bufsz) |
ed9eccbe | 2395 | m = async->prealloc_bufsz - async->buf_write_ptr; |
24e894bb | 2396 | comedi_buf_write_alloc(s, async->prealloc_bufsz); |
0f1f34e8 IA |
2397 | if (m > comedi_buf_write_n_allocated(s)) |
2398 | m = comedi_buf_write_n_allocated(s); | |
ed9eccbe DS |
2399 | if (m < n) |
2400 | n = m; | |
2401 | ||
2402 | if (n == 0) { | |
ed9eccbe DS |
2403 | if (file->f_flags & O_NONBLOCK) { |
2404 | retval = -EAGAIN; | |
2405 | break; | |
2406 | } | |
6a9ce6b6 | 2407 | schedule(); |
ed9eccbe DS |
2408 | if (signal_pending(current)) { |
2409 | retval = -ERESTARTSYS; | |
2410 | break; | |
2411 | } | |
476b8477 | 2412 | if (!s->busy) |
ed9eccbe | 2413 | break; |
ed9eccbe DS |
2414 | if (s->busy != file) { |
2415 | retval = -EACCES; | |
2416 | break; | |
2417 | } | |
f7398509 IA |
2418 | if (!(async->cmd.flags & CMDF_WRITE)) { |
2419 | retval = -EINVAL; | |
2420 | break; | |
2421 | } | |
ed9eccbe DS |
2422 | continue; |
2423 | } | |
2424 | ||
2425 | m = copy_from_user(async->prealloc_buf + async->buf_write_ptr, | |
476b8477 | 2426 | buf, n); |
ed9eccbe DS |
2427 | if (m) { |
2428 | n -= m; | |
2429 | retval = -EFAULT; | |
2430 | } | |
940dd35d | 2431 | comedi_buf_write_free(s, n); |
ed9eccbe DS |
2432 | |
2433 | count += n; | |
2434 | nbytes -= n; | |
2435 | ||
2436 | buf += n; | |
2437 | break; /* makes device work like a pipe */ | |
2438 | } | |
9329f139 IA |
2439 | out: |
2440 | if (on_wait_queue) | |
2441 | remove_wait_queue(&async->wait_head, &wait); | |
ed9eccbe | 2442 | set_current_state(TASK_RUNNING); |
9329f139 IA |
2443 | if (attach_locked) |
2444 | up_read(&dev->attach_lock); | |
ed9eccbe | 2445 | |
476b8477 | 2446 | return count ? count : retval; |
ed9eccbe DS |
2447 | } |
2448 | ||
92d0127c | 2449 | static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes, |
36efbacd | 2450 | loff_t *offset) |
ed9eccbe | 2451 | { |
34c43922 | 2452 | struct comedi_subdevice *s; |
d163679c | 2453 | struct comedi_async *async; |
ed9eccbe DS |
2454 | int n, m, count = 0, retval = 0; |
2455 | DECLARE_WAITQUEUE(wait, current); | |
20f083c0 IA |
2456 | struct comedi_file *cfp = file->private_data; |
2457 | struct comedi_device *dev = cfp->dev; | |
45c2bc55 IA |
2458 | unsigned int old_detach_count; |
2459 | bool become_nonbusy = false; | |
2460 | bool attach_locked; | |
3ffab428 | 2461 | |
45c2bc55 IA |
2462 | /* Protect against device detachment during operation. */ |
2463 | down_read(&dev->attach_lock); | |
2464 | attach_locked = true; | |
2465 | old_detach_count = dev->detach_count; | |
2466 | ||
ed9eccbe | 2467 | if (!dev->attached) { |
272850f0 | 2468 | dev_dbg(dev->class_dev, "no driver attached\n"); |
45c2bc55 IA |
2469 | retval = -ENODEV; |
2470 | goto out; | |
ed9eccbe DS |
2471 | } |
2472 | ||
20f083c0 | 2473 | s = comedi_file_read_subdevice(file); |
45c2bc55 IA |
2474 | if (!s || !s->async) { |
2475 | retval = -EIO; | |
2476 | goto out; | |
2477 | } | |
5c87fef5 | 2478 | |
ed9eccbe | 2479 | async = s->async; |
5c87fef5 | 2480 | if (!s->busy || !nbytes) |
45c2bc55 IA |
2481 | goto out; |
2482 | if (s->busy != file) { | |
2483 | retval = -EACCES; | |
2484 | goto out; | |
2485 | } | |
f025ab9e IA |
2486 | if (async->cmd.flags & CMDF_WRITE) { |
2487 | retval = -EINVAL; | |
2488 | goto out; | |
2489 | } | |
ed9eccbe DS |
2490 | |
2491 | add_wait_queue(&async->wait_head, &wait); | |
2492 | while (nbytes > 0 && !retval) { | |
2493 | set_current_state(TASK_INTERRUPTIBLE); | |
2494 | ||
2495 | n = nbytes; | |
2496 | ||
e9edef3a | 2497 | m = comedi_buf_read_n_available(s); |
476b8477 | 2498 | if (async->buf_read_ptr + m > async->prealloc_bufsz) |
ed9eccbe | 2499 | m = async->prealloc_bufsz - async->buf_read_ptr; |
ed9eccbe DS |
2500 | if (m < n) |
2501 | n = m; | |
2502 | ||
2503 | if (n == 0) { | |
b183a836 IA |
2504 | unsigned runflags = comedi_get_subdevice_runflags(s); |
2505 | ||
2506 | if (!comedi_is_runflags_running(runflags)) { | |
2507 | if (comedi_is_runflags_in_error(runflags)) | |
ed9eccbe | 2508 | retval = -EPIPE; |
c098c21a | 2509 | else |
ed9eccbe | 2510 | retval = 0; |
45c2bc55 | 2511 | become_nonbusy = true; |
ed9eccbe DS |
2512 | break; |
2513 | } | |
2514 | if (file->f_flags & O_NONBLOCK) { | |
2515 | retval = -EAGAIN; | |
2516 | break; | |
2517 | } | |
6a9ce6b6 | 2518 | schedule(); |
ed9eccbe DS |
2519 | if (signal_pending(current)) { |
2520 | retval = -ERESTARTSYS; | |
2521 | break; | |
2522 | } | |
ed9eccbe DS |
2523 | if (!s->busy) { |
2524 | retval = 0; | |
2525 | break; | |
2526 | } | |
2527 | if (s->busy != file) { | |
2528 | retval = -EACCES; | |
2529 | break; | |
2530 | } | |
f025ab9e IA |
2531 | if (async->cmd.flags & CMDF_WRITE) { |
2532 | retval = -EINVAL; | |
2533 | break; | |
2534 | } | |
ed9eccbe DS |
2535 | continue; |
2536 | } | |
2537 | m = copy_to_user(buf, async->prealloc_buf + | |
476b8477 | 2538 | async->buf_read_ptr, n); |
ed9eccbe DS |
2539 | if (m) { |
2540 | n -= m; | |
2541 | retval = -EFAULT; | |
2542 | } | |
2543 | ||
d13be55a | 2544 | comedi_buf_read_alloc(s, n); |
f1df8662 | 2545 | comedi_buf_read_free(s, n); |
ed9eccbe DS |
2546 | |
2547 | count += n; | |
2548 | nbytes -= n; | |
2549 | ||
2550 | buf += n; | |
2551 | break; /* makes device work like a pipe */ | |
2552 | } | |
45c2bc55 IA |
2553 | remove_wait_queue(&async->wait_head, &wait); |
2554 | set_current_state(TASK_RUNNING); | |
2555 | if (become_nonbusy || comedi_is_subdevice_idle(s)) { | |
2556 | struct comedi_subdevice *new_s; | |
2557 | ||
2558 | /* | |
2559 | * To avoid deadlock, cannot acquire dev->mutex | |
2560 | * while dev->attach_lock is held. | |
2561 | */ | |
2562 | up_read(&dev->attach_lock); | |
2563 | attach_locked = false; | |
4b18f08b | 2564 | mutex_lock(&dev->mutex); |
45c2bc55 IA |
2565 | /* |
2566 | * Check device hasn't become detached behind our back. | |
2567 | * Checking dev->detach_count is unchanged ought to be | |
2568 | * sufficient (unless there have been 2**32 detaches in the | |
2569 | * meantime!), but check the subdevice pointer as well just in | |
2570 | * case. | |
2571 | */ | |
20f083c0 | 2572 | new_s = comedi_file_read_subdevice(file); |
45c2bc55 IA |
2573 | if (dev->attached && old_detach_count == dev->detach_count && |
2574 | s == new_s && new_s->async == async) { | |
f4f3f7cf | 2575 | if (become_nonbusy || comedi_buf_n_bytes_ready(s) == 0) |
45c2bc55 IA |
2576 | do_become_nonbusy(dev, s); |
2577 | } | |
4b18f08b | 2578 | mutex_unlock(&dev->mutex); |
ed9eccbe | 2579 | } |
45c2bc55 IA |
2580 | out: |
2581 | if (attach_locked) | |
2582 | up_read(&dev->attach_lock); | |
ed9eccbe | 2583 | |
476b8477 | 2584 | return count ? count : retval; |
ed9eccbe DS |
2585 | } |
2586 | ||
ed9eccbe DS |
2587 | static int comedi_open(struct inode *inode, struct file *file) |
2588 | { | |
ed9eccbe | 2589 | const unsigned minor = iminor(inode); |
20f083c0 | 2590 | struct comedi_file *cfp; |
fc406986 IA |
2591 | struct comedi_device *dev = comedi_dev_get_from_minor(minor); |
2592 | int rc; | |
97920071 | 2593 | |
4da5fa9a | 2594 | if (!dev) { |
272850f0 | 2595 | pr_debug("invalid minor number\n"); |
ed9eccbe DS |
2596 | return -ENODEV; |
2597 | } | |
2598 | ||
20f083c0 IA |
2599 | cfp = kzalloc(sizeof(*cfp), GFP_KERNEL); |
2600 | if (!cfp) | |
2601 | return -ENOMEM; | |
2602 | ||
2603 | cfp->dev = dev; | |
2604 | ||
ed9eccbe | 2605 | mutex_lock(&dev->mutex); |
0e0d311e IA |
2606 | if (!dev->attached && !capable(CAP_SYS_ADMIN)) { |
2607 | dev_dbg(dev->class_dev, "not attached and not CAP_SYS_ADMIN\n"); | |
fc406986 IA |
2608 | rc = -ENODEV; |
2609 | goto out; | |
ed9eccbe | 2610 | } |
1363e4fb | 2611 | if (dev->attached && dev->use_count == 0) { |
ed9eccbe | 2612 | if (!try_module_get(dev->driver->module)) { |
90e6f51d | 2613 | rc = -ENXIO; |
fc406986 | 2614 | goto out; |
ed9eccbe | 2615 | } |
1363e4fb IA |
2616 | if (dev->open) { |
2617 | rc = dev->open(dev); | |
2618 | if (rc < 0) { | |
2619 | module_put(dev->driver->module); | |
2620 | goto out; | |
2621 | } | |
3c17ba07 IA |
2622 | } |
2623 | } | |
ed9eccbe DS |
2624 | |
2625 | dev->use_count++; | |
20f083c0 IA |
2626 | file->private_data = cfp; |
2627 | comedi_file_reset(file); | |
fc406986 | 2628 | rc = 0; |
ed9eccbe | 2629 | |
fc406986 | 2630 | out: |
a5011a26 | 2631 | mutex_unlock(&dev->mutex); |
20f083c0 | 2632 | if (rc) { |
fc406986 | 2633 | comedi_dev_put(dev); |
20f083c0 IA |
2634 | kfree(cfp); |
2635 | } | |
fc406986 | 2636 | return rc; |
ed9eccbe DS |
2637 | } |
2638 | ||
2aae0076 HS |
2639 | static int comedi_fasync(int fd, struct file *file, int on) |
2640 | { | |
20f083c0 IA |
2641 | struct comedi_file *cfp = file->private_data; |
2642 | struct comedi_device *dev = cfp->dev; | |
2aae0076 HS |
2643 | |
2644 | return fasync_helper(fd, file, on, &dev->async_queue); | |
2645 | } | |
2646 | ||
a5011a26 | 2647 | static int comedi_close(struct inode *inode, struct file *file) |
ed9eccbe | 2648 | { |
20f083c0 IA |
2649 | struct comedi_file *cfp = file->private_data; |
2650 | struct comedi_device *dev = cfp->dev; | |
a5011a26 | 2651 | struct comedi_subdevice *s = NULL; |
ed9eccbe DS |
2652 | int i; |
2653 | ||
a5011a26 HS |
2654 | mutex_lock(&dev->mutex); |
2655 | ||
2656 | if (dev->subdevices) { | |
2657 | for (i = 0; i < dev->n_subdevices; i++) { | |
b077f2cd | 2658 | s = &dev->subdevices[i]; |
a5011a26 HS |
2659 | |
2660 | if (s->busy == file) | |
2661 | do_cancel(dev, s); | |
2662 | if (s->lock == file) | |
2663 | s->lock = NULL; | |
2664 | } | |
ed9eccbe | 2665 | } |
1363e4fb IA |
2666 | if (dev->attached && dev->use_count == 1) { |
2667 | if (dev->close) | |
2668 | dev->close(dev); | |
a5011a26 | 2669 | module_put(dev->driver->module); |
1363e4fb | 2670 | } |
a5011a26 HS |
2671 | |
2672 | dev->use_count--; | |
2673 | ||
2674 | mutex_unlock(&dev->mutex); | |
fc406986 | 2675 | comedi_dev_put(dev); |
20f083c0 | 2676 | kfree(cfp); |
a5011a26 | 2677 | |
ed9eccbe DS |
2678 | return 0; |
2679 | } | |
2680 | ||
8cb8aad7 | 2681 | static const struct file_operations comedi_fops = { |
a5011a26 HS |
2682 | .owner = THIS_MODULE, |
2683 | .unlocked_ioctl = comedi_unlocked_ioctl, | |
2684 | .compat_ioctl = comedi_compat_ioctl, | |
2685 | .open = comedi_open, | |
2686 | .release = comedi_close, | |
2687 | .read = comedi_read, | |
2688 | .write = comedi_write, | |
2689 | .mmap = comedi_mmap, | |
2690 | .poll = comedi_poll, | |
2691 | .fasync = comedi_fasync, | |
2692 | .llseek = noop_llseek, | |
2693 | }; | |
2694 | ||
dd630cde | 2695 | /** |
a3e39942 IA |
2696 | * comedi_event() - Handle events for asynchronous COMEDI command |
2697 | * @dev: COMEDI device. | |
2698 | * @s: COMEDI subdevice. | |
2699 | * Context: in_interrupt() (usually), @s->spin_lock spin-lock not held. | |
dd630cde | 2700 | * |
a3e39942 IA |
2701 | * If an asynchronous COMEDI command is active on the subdevice, process |
2702 | * any %COMEDI_CB_... event flags that have been set, usually by an | |
dd630cde | 2703 | * interrupt handler. These may change the run state of the asynchronous |
a3e39942 | 2704 | * command, wake a task, and/or send a %SIGIO signal. |
dd630cde | 2705 | */ |
a5011a26 | 2706 | void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s) |
883db3d9 | 2707 | { |
a5011a26 | 2708 | struct comedi_async *async = s->async; |
ef4b4b27 IA |
2709 | unsigned int events; |
2710 | int si_code = 0; | |
2711 | unsigned long flags; | |
2712 | ||
2713 | spin_lock_irqsave(&s->spin_lock, flags); | |
883db3d9 | 2714 | |
ef4b4b27 | 2715 | events = async->events; |
922d9ced | 2716 | async->events = 0; |
ef4b4b27 IA |
2717 | if (!__comedi_is_subdevice_running(s)) { |
2718 | spin_unlock_irqrestore(&s->spin_lock, flags); | |
a5011a26 | 2719 | return; |
ef4b4b27 | 2720 | } |
a5011a26 | 2721 | |
922d9ced | 2722 | if (events & COMEDI_CB_CANCEL_MASK) |
ef4b4b27 | 2723 | __comedi_clear_subdevice_runflags(s, COMEDI_SRF_RUNNING); |
781f933c HS |
2724 | |
2725 | /* | |
ef4b4b27 IA |
2726 | * Remember if an error event has occurred, so an error can be |
2727 | * returned the next time the user does a read() or write(). | |
781f933c | 2728 | */ |
ef4b4b27 IA |
2729 | if (events & COMEDI_CB_ERROR_MASK) |
2730 | __comedi_set_subdevice_runflags(s, COMEDI_SRF_ERROR); | |
883db3d9 | 2731 | |
922d9ced | 2732 | if (async->cb_mask & events) { |
c265be01 | 2733 | wake_up_interruptible(&async->wait_head); |
aa33122f | 2734 | si_code = async->cmd.flags & CMDF_WRITE ? POLL_OUT : POLL_IN; |
a5011a26 | 2735 | } |
ef4b4b27 IA |
2736 | |
2737 | spin_unlock_irqrestore(&s->spin_lock, flags); | |
2738 | ||
2739 | if (si_code) | |
2740 | kill_fasync(&dev->async_queue, SIGIO, si_code); | |
883db3d9 | 2741 | } |
5660e742 | 2742 | EXPORT_SYMBOL_GPL(comedi_event); |
883db3d9 | 2743 | |
07778393 | 2744 | /* Note: the ->mutex is pre-locked on successful return */ |
7638ffcb | 2745 | struct comedi_device *comedi_alloc_board_minor(struct device *hardware_device) |
a5011a26 | 2746 | { |
7638ffcb | 2747 | struct comedi_device *dev; |
a5011a26 HS |
2748 | struct device *csdev; |
2749 | unsigned i; | |
a5011a26 | 2750 | |
36efbacd | 2751 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
88cc30cf | 2752 | if (!dev) |
7638ffcb | 2753 | return ERR_PTR(-ENOMEM); |
7638ffcb | 2754 | comedi_device_init(dev); |
db2e3487 | 2755 | comedi_set_hw_dev(dev, hardware_device); |
07778393 | 2756 | mutex_lock(&dev->mutex); |
5b7dba1b | 2757 | mutex_lock(&comedi_board_minor_table_lock); |
38b9722a IA |
2758 | for (i = hardware_device ? comedi_num_legacy_minors : 0; |
2759 | i < COMEDI_NUM_BOARD_MINORS; ++i) { | |
88cc30cf | 2760 | if (!comedi_board_minor_table[i]) { |
cb6b79de | 2761 | comedi_board_minor_table[i] = dev; |
a5011a26 HS |
2762 | break; |
2763 | } | |
2764 | } | |
5b7dba1b | 2765 | mutex_unlock(&comedi_board_minor_table_lock); |
a5011a26 | 2766 | if (i == COMEDI_NUM_BOARD_MINORS) { |
07778393 | 2767 | mutex_unlock(&dev->mutex); |
7638ffcb | 2768 | comedi_device_cleanup(dev); |
5b13ed94 | 2769 | comedi_dev_put(dev); |
a112eab4 HM |
2770 | dev_err(hardware_device, |
2771 | "ran out of minor numbers for board device files\n"); | |
7638ffcb | 2772 | return ERR_PTR(-EBUSY); |
a5011a26 | 2773 | } |
7638ffcb | 2774 | dev->minor = i; |
a5011a26 HS |
2775 | csdev = device_create(comedi_class, hardware_device, |
2776 | MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i", i); | |
2777 | if (!IS_ERR(csdev)) | |
8f988d87 | 2778 | dev->class_dev = get_device(csdev); |
883db3d9 | 2779 | |
07778393 | 2780 | /* Note: dev->mutex needs to be unlocked by the caller. */ |
7638ffcb | 2781 | return dev; |
883db3d9 FMH |
2782 | } |
2783 | ||
3346b798 | 2784 | void comedi_release_hardware_device(struct device *hardware_device) |
883db3d9 | 2785 | { |
a5011a26 | 2786 | int minor; |
cb6b79de | 2787 | struct comedi_device *dev; |
883db3d9 | 2788 | |
38b9722a IA |
2789 | for (minor = comedi_num_legacy_minors; minor < COMEDI_NUM_BOARD_MINORS; |
2790 | minor++) { | |
5b7dba1b | 2791 | mutex_lock(&comedi_board_minor_table_lock); |
cb6b79de IA |
2792 | dev = comedi_board_minor_table[minor]; |
2793 | if (dev && dev->hw_dev == hardware_device) { | |
5b7dba1b IA |
2794 | comedi_board_minor_table[minor] = NULL; |
2795 | mutex_unlock(&comedi_board_minor_table_lock); | |
cb6b79de | 2796 | comedi_free_board_dev(dev); |
3346b798 | 2797 | break; |
a5011a26 | 2798 | } |
5b7dba1b | 2799 | mutex_unlock(&comedi_board_minor_table_lock); |
883db3d9 | 2800 | } |
883db3d9 FMH |
2801 | } |
2802 | ||
f65cc544 | 2803 | int comedi_alloc_subdevice_minor(struct comedi_subdevice *s) |
883db3d9 | 2804 | { |
f65cc544 | 2805 | struct comedi_device *dev = s->device; |
a5011a26 HS |
2806 | struct device *csdev; |
2807 | unsigned i; | |
883db3d9 | 2808 | |
5b7dba1b IA |
2809 | mutex_lock(&comedi_subdevice_minor_table_lock); |
2810 | for (i = 0; i < COMEDI_NUM_SUBDEVICE_MINORS; ++i) { | |
88cc30cf | 2811 | if (!comedi_subdevice_minor_table[i]) { |
bd5b4173 | 2812 | comedi_subdevice_minor_table[i] = s; |
a5011a26 HS |
2813 | break; |
2814 | } | |
2815 | } | |
5b7dba1b IA |
2816 | mutex_unlock(&comedi_subdevice_minor_table_lock); |
2817 | if (i == COMEDI_NUM_SUBDEVICE_MINORS) { | |
a112eab4 HM |
2818 | dev_err(dev->class_dev, |
2819 | "ran out of minor numbers for subdevice files\n"); | |
a5011a26 HS |
2820 | return -EBUSY; |
2821 | } | |
5b7dba1b | 2822 | i += COMEDI_NUM_BOARD_MINORS; |
a5011a26 HS |
2823 | s->minor = i; |
2824 | csdev = device_create(comedi_class, dev->class_dev, | |
2825 | MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i_subd%i", | |
90a35c15 | 2826 | dev->minor, s->index); |
a5011a26 HS |
2827 | if (!IS_ERR(csdev)) |
2828 | s->class_dev = csdev; | |
883db3d9 | 2829 | |
da718546 | 2830 | return 0; |
883db3d9 FMH |
2831 | } |
2832 | ||
a5011a26 | 2833 | void comedi_free_subdevice_minor(struct comedi_subdevice *s) |
883db3d9 | 2834 | { |
0fcc9d48 | 2835 | unsigned int i; |
883db3d9 | 2836 | |
88cc30cf | 2837 | if (!s) |
a5011a26 | 2838 | return; |
5104a898 HS |
2839 | if (s->minor < COMEDI_NUM_BOARD_MINORS || |
2840 | s->minor >= COMEDI_NUM_MINORS) | |
a5011a26 | 2841 | return; |
883db3d9 | 2842 | |
0fcc9d48 IA |
2843 | i = s->minor - COMEDI_NUM_BOARD_MINORS; |
2844 | mutex_lock(&comedi_subdevice_minor_table_lock); | |
bd5b4173 IA |
2845 | if (s == comedi_subdevice_minor_table[i]) |
2846 | comedi_subdevice_minor_table[i] = NULL; | |
0fcc9d48 | 2847 | mutex_unlock(&comedi_subdevice_minor_table_lock); |
a5011a26 HS |
2848 | if (s->class_dev) { |
2849 | device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor)); | |
2850 | s->class_dev = NULL; | |
883db3d9 | 2851 | } |
883db3d9 | 2852 | } |
a5787824 | 2853 | |
682b9119 | 2854 | static void comedi_cleanup_board_minors(void) |
76cca89f | 2855 | { |
2be8ae58 | 2856 | struct comedi_device *dev; |
76cca89f HS |
2857 | unsigned i; |
2858 | ||
2be8ae58 HS |
2859 | for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) { |
2860 | dev = comedi_clear_board_minor(i); | |
2861 | comedi_free_board_dev(dev); | |
2862 | } | |
76cca89f HS |
2863 | } |
2864 | ||
91fa0b0c HS |
2865 | static int __init comedi_init(void) |
2866 | { | |
2867 | int i; | |
2868 | int retval; | |
2869 | ||
c2ad078b | 2870 | pr_info("version " COMEDI_RELEASE " - http://www.comedi.org\n"); |
91fa0b0c HS |
2871 | |
2872 | if (comedi_num_legacy_minors < 0 || | |
2873 | comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) { | |
c2ad078b | 2874 | pr_err("invalid value for module parameter \"comedi_num_legacy_minors\". Valid values are 0 through %i.\n", |
91fa0b0c HS |
2875 | COMEDI_NUM_BOARD_MINORS); |
2876 | return -EINVAL; | |
2877 | } | |
2878 | ||
91fa0b0c HS |
2879 | retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0), |
2880 | COMEDI_NUM_MINORS, "comedi"); | |
2881 | if (retval) | |
2882 | return -EIO; | |
2883 | cdev_init(&comedi_cdev, &comedi_fops); | |
2884 | comedi_cdev.owner = THIS_MODULE; | |
a5bde3a1 AP |
2885 | |
2886 | retval = kobject_set_name(&comedi_cdev.kobj, "comedi"); | |
2887 | if (retval) { | |
2888 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
2889 | COMEDI_NUM_MINORS); | |
2890 | return retval; | |
2891 | } | |
2892 | ||
91fa0b0c HS |
2893 | if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) { |
2894 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
2895 | COMEDI_NUM_MINORS); | |
2896 | return -EIO; | |
2897 | } | |
2898 | comedi_class = class_create(THIS_MODULE, "comedi"); | |
2899 | if (IS_ERR(comedi_class)) { | |
c2ad078b | 2900 | pr_err("failed to create class\n"); |
91fa0b0c HS |
2901 | cdev_del(&comedi_cdev); |
2902 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
2903 | COMEDI_NUM_MINORS); | |
2904 | return PTR_ERR(comedi_class); | |
2905 | } | |
2906 | ||
e56341ad | 2907 | comedi_class->dev_groups = comedi_dev_groups; |
91fa0b0c HS |
2908 | |
2909 | /* XXX requires /proc interface */ | |
2910 | comedi_proc_init(); | |
2911 | ||
2912 | /* create devices files for legacy/manual use */ | |
2913 | for (i = 0; i < comedi_num_legacy_minors; i++) { | |
7638ffcb | 2914 | struct comedi_device *dev; |
4bac39f6 | 2915 | |
7638ffcb IA |
2916 | dev = comedi_alloc_board_minor(NULL); |
2917 | if (IS_ERR(dev)) { | |
682b9119 | 2918 | comedi_cleanup_board_minors(); |
91fa0b0c HS |
2919 | cdev_del(&comedi_cdev); |
2920 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), | |
2921 | COMEDI_NUM_MINORS); | |
7638ffcb | 2922 | return PTR_ERR(dev); |
91fa0b0c | 2923 | } |
cb3aadae KH |
2924 | /* comedi_alloc_board_minor() locked the mutex */ |
2925 | mutex_unlock(&dev->mutex); | |
91fa0b0c HS |
2926 | } |
2927 | ||
2928 | return 0; | |
2929 | } | |
2930 | module_init(comedi_init); | |
2931 | ||
2932 | static void __exit comedi_cleanup(void) | |
2933 | { | |
682b9119 | 2934 | comedi_cleanup_board_minors(); |
91fa0b0c HS |
2935 | class_destroy(comedi_class); |
2936 | cdev_del(&comedi_cdev); | |
2937 | unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS); | |
2938 | ||
2939 | comedi_proc_cleanup(); | |
2940 | } | |
2941 | module_exit(comedi_cleanup); | |
2942 | ||
a5787824 HS |
2943 | MODULE_AUTHOR("http://www.comedi.org"); |
2944 | MODULE_DESCRIPTION("Comedi core module"); | |
2945 | MODULE_LICENSE("GPL"); |