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Merge tag 'master-2014-11-25' of git://git.kernel.org/pub/scm/linux/kernel/git/linvil...
[deliverable/linux.git] / drivers / staging / comedi / comedi_fops.c
CommitLineData
ed9eccbe
DS		 1/*
2 comedi/comedi_fops.c
3 comedi kernel module
4
5 COMEDI - Linux Control and Measurement Device Interface
6 Copyright (C) 1997-2000 David A. Schleef <ds@schleef.org>
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
ed9eccbe
DS		 17*/
18
c2ad078b
HS		 19#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
20
ed9eccbe
DS		 21#include "comedi_compat32.h"
22
23#include <linux/module.h>
24#include <linux/errno.h>
25#include <linux/kernel.h>
26#include <linux/sched.h>
27#include <linux/fcntl.h>
28#include <linux/delay.h>
ed9eccbe
DS		 29#include <linux/mm.h>
30#include <linux/slab.h>
31#include <linux/kmod.h>
32#include <linux/poll.h>
33#include <linux/init.h>
34#include <linux/device.h>
35#include <linux/vmalloc.h>
36#include <linux/fs.h>
37#include "comedidev.h"
38#include <linux/cdev.h>
883db3d9 39#include <linux/stat.h>
ed9eccbe 40
476b8477
GKH		 41#include <linux/io.h>
42#include <linux/uaccess.h>
ed9eccbe 43
3a5fa275 44#include "comedi_internal.h"
ed9eccbe 45
eda56825 46#define COMEDI_NUM_MINORS 0x100
5b7dba1b
IA		 47#define COMEDI_NUM_SUBDEVICE_MINORS \
48 (COMEDI_NUM_MINORS - COMEDI_NUM_BOARD_MINORS)
eda56825 49
92d0127c 50static int comedi_num_legacy_minors;
4d7df821
IA		 51module_param(comedi_num_legacy_minors, int, S_IRUGO);
52MODULE_PARM_DESC(comedi_num_legacy_minors,
53 "number of comedi minor devices to reserve for non-auto-configured devices (default 0)"
54 );
55
234bb3c6 56unsigned int comedi_default_buf_size_kb = CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB;
4d7df821
IA		 57module_param(comedi_default_buf_size_kb, uint, S_IRUGO | S_IWUSR);
58MODULE_PARM_DESC(comedi_default_buf_size_kb,
59 "default asynchronous buffer size in KiB (default "
234bb3c6 60 __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB) ")");
4d7df821 61
234bb3c6
IA		 62unsigned int comedi_default_buf_maxsize_kb
63 = CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB;
4d7df821
IA		 64module_param(comedi_default_buf_maxsize_kb, uint, S_IRUGO | S_IWUSR);
65MODULE_PARM_DESC(comedi_default_buf_maxsize_kb,
66 "default maximum size of asynchronous buffer in KiB (default "
234bb3c6 67 __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB) ")");
1dd33ab8 68
5b7dba1b 69static DEFINE_MUTEX(comedi_board_minor_table_lock);
cb6b79de 70static struct comedi_device
5b7dba1b
IA		 71*comedi_board_minor_table[COMEDI_NUM_BOARD_MINORS];
72
73static DEFINE_MUTEX(comedi_subdevice_minor_table_lock);
74/* Note: indexed by minor - COMEDI_NUM_BOARD_MINORS. */
bd5b4173 75static struct comedi_subdevice
5b7dba1b 76*comedi_subdevice_minor_table[COMEDI_NUM_SUBDEVICE_MINORS];
476b8477 77
d9740a03
IA		 78static struct class *comedi_class;
79static struct cdev comedi_cdev;
80
81static void comedi_device_init(struct comedi_device *dev)
82{
5b13ed94 83 kref_init(&dev->refcount);
d9740a03
IA		 84 spin_lock_init(&dev->spinlock);
85 mutex_init(&dev->mutex);
2f3fdcd7 86 init_rwsem(&dev->attach_lock);
d9740a03
IA		 87 dev->minor = -1;
88}
89
5b13ed94
IA		 90static void comedi_dev_kref_release(struct kref *kref)
91{
92 struct comedi_device *dev =
93 container_of(kref, struct comedi_device, refcount);
94
95 mutex_destroy(&dev->mutex);
8f988d87 96 put_device(dev->class_dev);
5b13ed94
IA		 97 kfree(dev);
98}
99
100int comedi_dev_put(struct comedi_device *dev)
101{
102 if (dev)
103 return kref_put(&dev->refcount, comedi_dev_kref_release);
104 return 1;
105}
b449c1ca
IA		 106EXPORT_SYMBOL_GPL(comedi_dev_put);
107
108static struct comedi_device *comedi_dev_get(struct comedi_device *dev)
109{
110 if (dev)
111 kref_get(&dev->refcount);
112 return dev;
113}
5b13ed94 114
d9740a03
IA		 115static void comedi_device_cleanup(struct comedi_device *dev)
116{
117 struct module *driver_module = NULL;
118
119 if (dev == NULL)
120 return;
121 mutex_lock(&dev->mutex);
122 if (dev->attached)
123 driver_module = dev->driver->module;
124 comedi_device_detach(dev);
1363e4fb
IA		 125 if (driver_module && dev->use_count)
126 module_put(driver_module);
d9740a03 127 mutex_unlock(&dev->mutex);
d9740a03
IA		 128}
129
db210da2
IA		 130static bool comedi_clear_board_dev(struct comedi_device *dev)
131{
132 unsigned int i = dev->minor;
133 bool cleared = false;
134
135 mutex_lock(&comedi_board_minor_table_lock);
136 if (dev == comedi_board_minor_table[i]) {
137 comedi_board_minor_table[i] = NULL;
138 cleared = true;
139 }
140 mutex_unlock(&comedi_board_minor_table_lock);
141 return cleared;
142}
143
cb6b79de 144static struct comedi_device *comedi_clear_board_minor(unsigned minor)
d9740a03 145{
cb6b79de 146 struct comedi_device *dev;
d9740a03 147
5b7dba1b 148 mutex_lock(&comedi_board_minor_table_lock);
cb6b79de 149 dev = comedi_board_minor_table[minor];
5b7dba1b
IA		 150 comedi_board_minor_table[minor] = NULL;
151 mutex_unlock(&comedi_board_minor_table_lock);
cb6b79de 152 return dev;
d9740a03
IA		 153}
154
cb6b79de 155static void comedi_free_board_dev(struct comedi_device *dev)
d9740a03 156{
cb6b79de 157 if (dev) {
52ef9e7c 158 comedi_device_cleanup(dev);
cb6b79de
IA		 159 if (dev->class_dev) {
160 device_destroy(comedi_class,
161 MKDEV(COMEDI_MAJOR, dev->minor));
d9740a03 162 }
5b13ed94 163 comedi_dev_put(dev);
d9740a03
IA		 164 }
165}
8ab4ed6e 166
bd5b4173 167static struct comedi_subdevice
63ab0395 168*comedi_subdevice_from_minor(const struct comedi_device *dev, unsigned minor)
5b7dba1b 169{
bd5b4173 170 struct comedi_subdevice *s;
5b7dba1b
IA		 171 unsigned int i = minor - COMEDI_NUM_BOARD_MINORS;
172
173 BUG_ON(i >= COMEDI_NUM_SUBDEVICE_MINORS);
174 mutex_lock(&comedi_subdevice_minor_table_lock);
bd5b4173 175 s = comedi_subdevice_minor_table[i];
63ab0395
IA		 176 if (s && s->device != dev)
177 s = NULL;
5b7dba1b 178 mutex_unlock(&comedi_subdevice_minor_table_lock);
bd5b4173 179 return s;
5b7dba1b
IA		 180}
181
b449c1ca
IA		 182static struct comedi_device *comedi_dev_get_from_board_minor(unsigned minor)
183{
184 struct comedi_device *dev;
185
186 BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS);
187 mutex_lock(&comedi_board_minor_table_lock);
188 dev = comedi_dev_get(comedi_board_minor_table[minor]);
189 mutex_unlock(&comedi_board_minor_table_lock);
190 return dev;
191}
192
193static struct comedi_device *comedi_dev_get_from_subdevice_minor(unsigned minor)
194{
195 struct comedi_device *dev;
196 struct comedi_subdevice *s;
197 unsigned int i = minor - COMEDI_NUM_BOARD_MINORS;
198
199 BUG_ON(i >= COMEDI_NUM_SUBDEVICE_MINORS);
200 mutex_lock(&comedi_subdevice_minor_table_lock);
201 s = comedi_subdevice_minor_table[i];
202 dev = comedi_dev_get(s ? s->device : NULL);
203 mutex_unlock(&comedi_subdevice_minor_table_lock);
204 return dev;
205}
206
207struct comedi_device *comedi_dev_get_from_minor(unsigned minor)
208{
209 if (minor < COMEDI_NUM_BOARD_MINORS)
210 return comedi_dev_get_from_board_minor(minor);
cb3aadae
KH		 211
212 return comedi_dev_get_from_subdevice_minor(minor);
b449c1ca
IA		 213}
214EXPORT_SYMBOL_GPL(comedi_dev_get_from_minor);
215
43bd33f2 216static struct comedi_subdevice *
da56fdc6 217comedi_read_subdevice(const struct comedi_device *dev, unsigned int minor)
43bd33f2 218{
bd5b4173 219 struct comedi_subdevice *s;
da56fdc6
IA		 220
221 if (minor >= COMEDI_NUM_BOARD_MINORS) {
63ab0395
IA		 222 s = comedi_subdevice_from_minor(dev, minor);
223 if (s == NULL || (s->subdev_flags & SDF_CMD_READ))
bd5b4173 224 return s;
da56fdc6
IA		 225 }
226 return dev->read_subdev;
43bd33f2
HS		 227}
228
229static struct comedi_subdevice *
da56fdc6 230comedi_write_subdevice(const struct comedi_device *dev, unsigned int minor)
43bd33f2 231{
bd5b4173 232 struct comedi_subdevice *s;
da56fdc6
IA		 233
234 if (minor >= COMEDI_NUM_BOARD_MINORS) {
63ab0395
IA		 235 s = comedi_subdevice_from_minor(dev, minor);
236 if (s == NULL || (s->subdev_flags & SDF_CMD_WRITE))
bd5b4173 237 return s;
da56fdc6
IA		 238 }
239 return dev->write_subdev;
43bd33f2
HS		 240}
241
883db3d9 242static int resize_async_buffer(struct comedi_device *dev,
482f0a21 243 struct comedi_subdevice *s, unsigned new_size)
a5011a26 244{
482f0a21 245 struct comedi_async *async = s->async;
a5011a26
HS		 246 int retval;
247
248 if (new_size > async->max_bufsize)
249 return -EPERM;
250
251 if (s->busy) {
272850f0
HS		 252 dev_dbg(dev->class_dev,
253 "subdevice is busy, cannot resize buffer\n");
a5011a26
HS		 254 return -EBUSY;
255 }
d4526ab4 256 if (comedi_buf_is_mmapped(s)) {
272850f0
HS		 257 dev_dbg(dev->class_dev,
258 "subdevice is mmapped, cannot resize buffer\n");
a5011a26
HS		 259 return -EBUSY;
260 }
261
a5011a26
HS		 262 /* make sure buffer is an integral number of pages
263 * (we round up) */
264 new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK;
265
266 retval = comedi_buf_alloc(dev, s, new_size);
267 if (retval < 0)
268 return retval;
269
270 if (s->buf_change) {
d546b896 271 retval = s->buf_change(dev, s);
a5011a26
HS		 272 if (retval < 0)
273 return retval;
274 }
275
272850f0
HS		 276 dev_dbg(dev->class_dev, "subd %d buffer resized to %i bytes\n",
277 s->index, async->prealloc_bufsz);
a5011a26
HS		 278 return 0;
279}
280
281/* sysfs attribute files */
282
e56341ad 283static ssize_t max_read_buffer_kb_show(struct device *csdev,
a5011a26
HS		 284 struct device_attribute *attr, char *buf)
285{
c88db469 286 unsigned int minor = MINOR(csdev->devt);
7f4656c5
IA		 287 struct comedi_device *dev;
288 struct comedi_subdevice *s;
72fd9fac 289 unsigned int size = 0;
a5011a26 290
be535c9a 291 dev = comedi_dev_get_from_minor(minor);
5e04c254 292 if (!dev)
c88db469
IA		 293 return -ENODEV;
294
7f4656c5 295 mutex_lock(&dev->mutex);
da56fdc6 296 s = comedi_read_subdevice(dev, minor);
72fd9fac
HS		 297 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
298 size = s->async->max_bufsize / 1024;
7f4656c5 299 mutex_unlock(&dev->mutex);
a5011a26 300
be535c9a 301 comedi_dev_put(dev);
ecd56ff9 302 return snprintf(buf, PAGE_SIZE, "%u\n", size);
a5011a26
HS		 303}
304
e56341ad 305static ssize_t max_read_buffer_kb_store(struct device *csdev,
a5011a26
HS		 306 struct device_attribute *attr,
307 const char *buf, size_t count)
308{
c88db469 309 unsigned int minor = MINOR(csdev->devt);
7f4656c5
IA		 310 struct comedi_device *dev;
311 struct comedi_subdevice *s;
72fd9fac
HS		 312 unsigned int size;
313 int err;
314
315 err = kstrtouint(buf, 10, &size);
316 if (err)
317 return err;
318 if (size > (UINT_MAX / 1024))
a5011a26 319 return -EINVAL;
72fd9fac 320 size *= 1024;
a5011a26 321
be535c9a 322 dev = comedi_dev_get_from_minor(minor);
5e04c254 323 if (!dev)
c88db469
IA		 324 return -ENODEV;
325
7f4656c5 326 mutex_lock(&dev->mutex);
da56fdc6 327 s = comedi_read_subdevice(dev, minor);
72fd9fac
HS		 328 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
329 s->async->max_bufsize = size;
330 else
331 err = -EINVAL;
7f4656c5 332 mutex_unlock(&dev->mutex);
a5011a26 333
be535c9a 334 comedi_dev_put(dev);
72fd9fac 335 return err ? err : count;
a5011a26 336}
e56341ad 337static DEVICE_ATTR_RW(max_read_buffer_kb);
a5011a26 338
e56341ad 339static ssize_t read_buffer_kb_show(struct device *csdev,
a5011a26
HS		 340 struct device_attribute *attr, char *buf)
341{
c88db469 342 unsigned int minor = MINOR(csdev->devt);
7f4656c5
IA		 343 struct comedi_device *dev;
344 struct comedi_subdevice *s;
72fd9fac 345 unsigned int size = 0;
a5011a26 346
be535c9a 347 dev = comedi_dev_get_from_minor(minor);
5e04c254 348 if (!dev)
c88db469
IA		 349 return -ENODEV;
350
7f4656c5 351 mutex_lock(&dev->mutex);
da56fdc6 352 s = comedi_read_subdevice(dev, minor);
72fd9fac
HS		 353 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
354 size = s->async->prealloc_bufsz / 1024;
7f4656c5 355 mutex_unlock(&dev->mutex);
a5011a26 356
be535c9a 357 comedi_dev_put(dev);
ecd56ff9 358 return snprintf(buf, PAGE_SIZE, "%u\n", size);
a5011a26
HS		 359}
360
e56341ad 361static ssize_t read_buffer_kb_store(struct device *csdev,
a5011a26
HS		 362 struct device_attribute *attr,
363 const char *buf, size_t count)
364{
c88db469 365 unsigned int minor = MINOR(csdev->devt);
7f4656c5
IA		 366 struct comedi_device *dev;
367 struct comedi_subdevice *s;
72fd9fac
HS		 368 unsigned int size;
369 int err;
370
371 err = kstrtouint(buf, 10, &size);
372 if (err)
373 return err;
374 if (size > (UINT_MAX / 1024))
a5011a26 375 return -EINVAL;
72fd9fac 376 size *= 1024;
a5011a26 377
be535c9a 378 dev = comedi_dev_get_from_minor(minor);
5e04c254 379 if (!dev)
c88db469
IA		 380 return -ENODEV;
381
7f4656c5 382 mutex_lock(&dev->mutex);
da56fdc6 383 s = comedi_read_subdevice(dev, minor);
72fd9fac 384 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
482f0a21 385 err = resize_async_buffer(dev, s, size);
72fd9fac
HS		 386 else
387 err = -EINVAL;
7f4656c5 388 mutex_unlock(&dev->mutex);
a5011a26 389
be535c9a 390 comedi_dev_put(dev);
72fd9fac 391 return err ? err : count;
a5011a26 392}
e56341ad 393static DEVICE_ATTR_RW(read_buffer_kb);
883db3d9 394
e56341ad 395static ssize_t max_write_buffer_kb_show(struct device *csdev,
a5011a26
HS		 396 struct device_attribute *attr,
397 char *buf)
398{
c88db469 399 unsigned int minor = MINOR(csdev->devt);
7f4656c5
IA		 400 struct comedi_device *dev;
401 struct comedi_subdevice *s;
72fd9fac 402 unsigned int size = 0;
a5011a26 403
be535c9a 404 dev = comedi_dev_get_from_minor(minor);
5e04c254 405 if (!dev)
c88db469
IA		 406 return -ENODEV;
407
7f4656c5 408 mutex_lock(&dev->mutex);
da56fdc6 409 s = comedi_write_subdevice(dev, minor);
72fd9fac
HS		 410 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
411 size = s->async->max_bufsize / 1024;
7f4656c5 412 mutex_unlock(&dev->mutex);
a5011a26 413
be535c9a 414 comedi_dev_put(dev);
ecd56ff9 415 return snprintf(buf, PAGE_SIZE, "%u\n", size);
a5011a26
HS		 416}
417
e56341ad 418static ssize_t max_write_buffer_kb_store(struct device *csdev,
a5011a26
HS		 419 struct device_attribute *attr,
420 const char *buf, size_t count)
421{
c88db469 422 unsigned int minor = MINOR(csdev->devt);
7f4656c5
IA		 423 struct comedi_device *dev;
424 struct comedi_subdevice *s;
72fd9fac
HS		 425 unsigned int size;
426 int err;
427
428 err = kstrtouint(buf, 10, &size);
429 if (err)
430 return err;
431 if (size > (UINT_MAX / 1024))
a5011a26 432 return -EINVAL;
72fd9fac 433 size *= 1024;
a5011a26 434
be535c9a 435 dev = comedi_dev_get_from_minor(minor);
5e04c254 436 if (!dev)
c88db469
IA		 437 return -ENODEV;
438
7f4656c5 439 mutex_lock(&dev->mutex);
da56fdc6 440 s = comedi_write_subdevice(dev, minor);
72fd9fac
HS		 441 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
442 s->async->max_bufsize = size;
443 else
444 err = -EINVAL;
7f4656c5 445 mutex_unlock(&dev->mutex);
a5011a26 446
be535c9a 447 comedi_dev_put(dev);
72fd9fac 448 return err ? err : count;
a5011a26 449}
e56341ad 450static DEVICE_ATTR_RW(max_write_buffer_kb);
a5011a26 451
e56341ad 452static ssize_t write_buffer_kb_show(struct device *csdev,
a5011a26
HS		 453 struct device_attribute *attr, char *buf)
454{
c88db469 455 unsigned int minor = MINOR(csdev->devt);
7f4656c5
IA		 456 struct comedi_device *dev;
457 struct comedi_subdevice *s;
72fd9fac 458 unsigned int size = 0;
a5011a26 459
be535c9a 460 dev = comedi_dev_get_from_minor(minor);
5e04c254 461 if (!dev)
c88db469
IA		 462 return -ENODEV;
463
7f4656c5 464 mutex_lock(&dev->mutex);
da56fdc6 465 s = comedi_write_subdevice(dev, minor);
72fd9fac
HS		 466 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
467 size = s->async->prealloc_bufsz / 1024;
7f4656c5 468 mutex_unlock(&dev->mutex);
a5011a26 469
be535c9a 470 comedi_dev_put(dev);
ecd56ff9 471 return snprintf(buf, PAGE_SIZE, "%u\n", size);
a5011a26
HS		 472}
473
e56341ad 474static ssize_t write_buffer_kb_store(struct device *csdev,
a5011a26
HS		 475 struct device_attribute *attr,
476 const char *buf, size_t count)
477{
c88db469 478 unsigned int minor = MINOR(csdev->devt);
7f4656c5
IA		 479 struct comedi_device *dev;
480 struct comedi_subdevice *s;
72fd9fac
HS		 481 unsigned int size;
482 int err;
483
484 err = kstrtouint(buf, 10, &size);
485 if (err)
486 return err;
487 if (size > (UINT_MAX / 1024))
a5011a26 488 return -EINVAL;
72fd9fac 489 size *= 1024;
a5011a26 490
be535c9a 491 dev = comedi_dev_get_from_minor(minor);
5e04c254 492 if (!dev)
c88db469
IA		 493 return -ENODEV;
494
7f4656c5 495 mutex_lock(&dev->mutex);
da56fdc6 496 s = comedi_write_subdevice(dev, minor);
72fd9fac 497 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
482f0a21 498 err = resize_async_buffer(dev, s, size);
72fd9fac
HS		 499 else
500 err = -EINVAL;
7f4656c5 501 mutex_unlock(&dev->mutex);
a5011a26 502
be535c9a 503 comedi_dev_put(dev);
72fd9fac 504 return err ? err : count;
a5011a26 505}
e56341ad
GKH		 506static DEVICE_ATTR_RW(write_buffer_kb);
507
508static struct attribute *comedi_dev_attrs[] = {
509 &dev_attr_max_read_buffer_kb.attr,
510 &dev_attr_read_buffer_kb.attr,
511 &dev_attr_max_write_buffer_kb.attr,
512 &dev_attr_write_buffer_kb.attr,
513 NULL,
a5011a26 514};
e56341ad 515ATTRIBUTE_GROUPS(comedi_dev);
ed9eccbe 516
2aae0076
HS		 517static void comedi_set_subdevice_runflags(struct comedi_subdevice *s,
518 unsigned mask, unsigned bits)
519{
520 unsigned long flags;
521
522 spin_lock_irqsave(&s->spin_lock, flags);
523 s->runflags &= ~mask;
524 s->runflags |= (bits & mask);
525 spin_unlock_irqrestore(&s->spin_lock, flags);
526}
527
ade1764f 528static unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s)
74120719
HS		 529{
530 unsigned long flags;
531 unsigned runflags;
532
533 spin_lock_irqsave(&s->spin_lock, flags);
534 runflags = s->runflags;
535 spin_unlock_irqrestore(&s->spin_lock, flags);
536 return runflags;
537}
74120719 538
e0dac318
HS		 539bool comedi_is_subdevice_running(struct comedi_subdevice *s)
540{
541 unsigned runflags = comedi_get_subdevice_runflags(s);
542
543 return (runflags & SRF_RUNNING) ? true : false;
544}
545EXPORT_SYMBOL_GPL(comedi_is_subdevice_running);
546
c098c21a
HS		 547static bool comedi_is_subdevice_in_error(struct comedi_subdevice *s)
548{
549 unsigned runflags = comedi_get_subdevice_runflags(s);
550
551 return (runflags & SRF_ERROR) ? true : false;
552}
553
9682e28c
HS		 554static bool comedi_is_subdevice_idle(struct comedi_subdevice *s)
555{
556 unsigned runflags = comedi_get_subdevice_runflags(s);
557
558 return (runflags & (SRF_ERROR | SRF_RUNNING)) ? false : true;
559}
560
588ba6dc 561/**
0480bcb9 562 * comedi_alloc_spriv() - Allocate memory for the subdevice private data.
588ba6dc 563 * @s: comedi_subdevice struct
0480bcb9 564 * @size: size of the memory to allocate
588ba6dc
HS		 565 *
566 * This also sets the subdevice runflags to allow the core to automatically
567 * free the private data during the detach.
568 */
0480bcb9 569void *comedi_alloc_spriv(struct comedi_subdevice *s, size_t size)
588ba6dc 570{
0480bcb9
HS		 571 s->private = kzalloc(size, GFP_KERNEL);
572 if (s->private)
67aa4acb 573 s->runflags |= SRF_FREE_SPRIV;
0480bcb9 574 return s->private;
588ba6dc 575}
0480bcb9 576EXPORT_SYMBOL_GPL(comedi_alloc_spriv);
588ba6dc 577
2aae0076
HS		 578/*
579 This function restores a subdevice to an idle state.
580 */
581static void do_become_nonbusy(struct comedi_device *dev,
582 struct comedi_subdevice *s)
583{
584 struct comedi_async *async = s->async;
585
586 comedi_set_subdevice_runflags(s, SRF_RUNNING, 0);
587 if (async) {
fcc18a9a 588 comedi_buf_reset(s);
2aae0076
HS		 589 async->inttrig = NULL;
590 kfree(async->cmd.chanlist);
591 async->cmd.chanlist = NULL;
8da8c86f
IA		 592 s->busy = NULL;
593 wake_up_interruptible_all(&s->async->wait_head);
2aae0076
HS		 594 } else {
595 dev_err(dev->class_dev,
596 "BUG: (?) do_become_nonbusy called with async=NULL\n");
8da8c86f 597 s->busy = NULL;
2aae0076 598 }
2aae0076
HS		 599}
600
601static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
602{
603 int ret = 0;
604
f0124630 605 if (comedi_is_subdevice_running(s) && s->cancel)
2aae0076
HS		 606 ret = s->cancel(dev, s);
607
608 do_become_nonbusy(dev, s);
609
610 return ret;
611}
612
d19db51a
IA		 613void comedi_device_cancel_all(struct comedi_device *dev)
614{
615 struct comedi_subdevice *s;
616 int i;
617
618 if (!dev->attached)
619 return;
620
621 for (i = 0; i < dev->n_subdevices; i++) {
622 s = &dev->subdevices[i];
623 if (s->async)
624 do_cancel(dev, s);
625 }
626}
627
2aae0076
HS		 628static int is_device_busy(struct comedi_device *dev)
629{
630 struct comedi_subdevice *s;
631 int i;
632
633 if (!dev->attached)
634 return 0;
635
636 for (i = 0; i < dev->n_subdevices; i++) {
637 s = &dev->subdevices[i];
638 if (s->busy)
639 return 1;
d4526ab4 640 if (s->async && comedi_buf_is_mmapped(s))
2aae0076
HS		 641 return 1;
642 }
643
644 return 0;
645}
646
ed9eccbe
DS		 647/*
648 COMEDI_DEVCONFIG
649 device config ioctl
650
651 arg:
652 pointer to devconfig structure
653
654 reads:
655 devconfig structure at arg
656
657 writes:
658 none
659*/
0a85b6f0 660static int do_devconfig_ioctl(struct comedi_device *dev,
92d0127c 661 struct comedi_devconfig __user *arg)
ed9eccbe 662{
0707bb04 663 struct comedi_devconfig it;
ed9eccbe
DS		 664
665 if (!capable(CAP_SYS_ADMIN))
666 return -EPERM;
667
668 if (arg == NULL) {
669 if (is_device_busy(dev))
670 return -EBUSY;
476b8477 671 if (dev->attached) {
ed9eccbe 672 struct module *driver_module = dev->driver->module;
4bac39f6 673
ed9eccbe
DS		 674 comedi_device_detach(dev);
675 module_put(driver_module);
676 }
677 return 0;
678 }
679
bc252fd1 680 if (copy_from_user(&it, arg, sizeof(it)))
ed9eccbe
DS		 681 return -EFAULT;
682
683 it.board_name[COMEDI_NAMELEN - 1] = 0;
684
d1843132
HS		 685 if (it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) {
686 dev_warn(dev->class_dev,
687 "comedi_config --init_data is deprecated\n");
688 return -EINVAL;
ed9eccbe
DS		 689 }
690
8ab4ed6e
IA		 691 if (dev->minor >= comedi_num_legacy_minors)
692 /* don't re-use dynamically allocated comedi devices */
693 return -EBUSY;
694
b2a644b4
IA		 695 /* This increments the driver module count on success. */
696 return comedi_device_attach(dev, &it);
ed9eccbe
DS		 697}
698
699/*
700 COMEDI_BUFCONFIG
701 buffer configuration ioctl
702
703 arg:
704 pointer to bufconfig structure
705
706 reads:
707 bufconfig at arg
708
709 writes:
710 modified bufconfig at arg
711
712*/
92d0127c
GKH		 713static int do_bufconfig_ioctl(struct comedi_device *dev,
714 struct comedi_bufconfig __user *arg)
ed9eccbe 715{
be6aba4a 716 struct comedi_bufconfig bc;
d163679c 717 struct comedi_async *async;
34c43922 718 struct comedi_subdevice *s;
883db3d9 719 int retval = 0;
ed9eccbe 720
bc252fd1 721 if (copy_from_user(&bc, arg, sizeof(bc)))
ed9eccbe
DS		 722 return -EFAULT;
723
11f80ddf 724 if (bc.subdevice >= dev->n_subdevices)
ed9eccbe
DS		 725 return -EINVAL;
726
b077f2cd 727 s = &dev->subdevices[bc.subdevice];
ed9eccbe
DS		 728 async = s->async;
729
730 if (!async) {
272850f0
HS		 731 dev_dbg(dev->class_dev,
732 "subdevice does not have async capability\n");
ed9eccbe
DS		 733 bc.size = 0;
734 bc.maximum_size = 0;
735 goto copyback;
736 }
737
738 if (bc.maximum_size) {
739 if (!capable(CAP_SYS_ADMIN))
740 return -EPERM;
741
742 async->max_bufsize = bc.maximum_size;
743 }
744
745 if (bc.size) {
482f0a21 746 retval = resize_async_buffer(dev, s, bc.size);
883db3d9
FMH		 747 if (retval < 0)
748 return retval;
ed9eccbe
DS		 749 }
750
751 bc.size = async->prealloc_bufsz;
752 bc.maximum_size = async->max_bufsize;
753
476b8477 754copyback:
bc252fd1 755 if (copy_to_user(arg, &bc, sizeof(bc)))
ed9eccbe
DS		 756 return -EFAULT;
757
758 return 0;
759}
760
761/*
762 COMEDI_DEVINFO
763 device info ioctl
764
765 arg:
766 pointer to devinfo structure
767
768 reads:
769 none
770
771 writes:
772 devinfo structure
773
774*/
0a85b6f0 775static int do_devinfo_ioctl(struct comedi_device *dev,
92d0127c
GKH		 776 struct comedi_devinfo __user *arg,
777 struct file *file)
ed9eccbe 778{
6131ffaa 779 const unsigned minor = iminor(file_inode(file));
0e700923
HS		 780 struct comedi_subdevice *s;
781 struct comedi_devinfo devinfo;
ed9eccbe
DS		 782
783 memset(&devinfo, 0, sizeof(devinfo));
784
785 /* fill devinfo structure */
786 devinfo.version_code = COMEDI_VERSION_CODE;
787 devinfo.n_subdevs = dev->n_subdevices;
819cbb12
VK		 788 strlcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN);
789 strlcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN);
ed9eccbe 790
da56fdc6 791 s = comedi_read_subdevice(dev, minor);
0e700923 792 if (s)
90a35c15 793 devinfo.read_subdevice = s->index;
476b8477 794 else
ed9eccbe 795 devinfo.read_subdevice = -1;
476b8477 796
da56fdc6 797 s = comedi_write_subdevice(dev, minor);
0e700923 798 if (s)
90a35c15 799 devinfo.write_subdevice = s->index;
476b8477 800 else
ed9eccbe 801 devinfo.write_subdevice = -1;
ed9eccbe 802
bc252fd1 803 if (copy_to_user(arg, &devinfo, sizeof(devinfo)))
ed9eccbe
DS		 804 return -EFAULT;
805
806 return 0;
807}
808
809/*
810 COMEDI_SUBDINFO
811 subdevice info ioctl
812
813 arg:
814 pointer to array of subdevice info structures
815
816 reads:
817 none
818
819 writes:
820 array of subdevice info structures at arg
821
822*/
0a85b6f0 823static int do_subdinfo_ioctl(struct comedi_device *dev,
92d0127c 824 struct comedi_subdinfo __user *arg, void *file)
ed9eccbe
DS		 825{
826 int ret, i;
bd52efbb 827 struct comedi_subdinfo *tmp, *us;
34c43922 828 struct comedi_subdevice *s;
ed9eccbe 829
bc252fd1 830 tmp = kcalloc(dev->n_subdevices, sizeof(*tmp), GFP_KERNEL);
ed9eccbe
DS		 831 if (!tmp)
832 return -ENOMEM;
833
834 /* fill subdinfo structs */
835 for (i = 0; i < dev->n_subdevices; i++) {
b077f2cd 836 s = &dev->subdevices[i];
ed9eccbe
DS		 837 us = tmp + i;
838
839 us->type = s->type;
840 us->n_chan = s->n_chan;
841 us->subd_flags = s->subdev_flags;
f0124630 842 if (comedi_is_subdevice_running(s))
ed9eccbe
DS		 843 us->subd_flags |= SDF_RUNNING;
844#define TIMER_nanosec 5 /* backwards compatibility */
845 us->timer_type = TIMER_nanosec;
846 us->len_chanlist = s->len_chanlist;
847 us->maxdata = s->maxdata;
848 if (s->range_table) {
849 us->range_type =
476b8477 850 (i << 24) | (0 << 16) | (s->range_table->length);
ed9eccbe
DS		 851 } else {
852 us->range_type = 0; /* XXX */
853 }
ed9eccbe
DS		 854
855 if (s->busy)
856 us->subd_flags |= SDF_BUSY;
857 if (s->busy == file)
858 us->subd_flags |= SDF_BUSY_OWNER;
859 if (s->lock)
860 us->subd_flags |= SDF_LOCKED;
861 if (s->lock == file)
862 us->subd_flags |= SDF_LOCK_OWNER;
863 if (!s->maxdata && s->maxdata_list)
864 us->subd_flags |= SDF_MAXDATA;
ed9eccbe
DS		 865 if (s->range_table_list)
866 us->subd_flags |= SDF_RANGETYPE;
867 if (s->do_cmd)
868 us->subd_flags |= SDF_CMD;
869
870 if (s->insn_bits != &insn_inval)
871 us->insn_bits_support = COMEDI_SUPPORTED;
872 else
873 us->insn_bits_support = COMEDI_UNSUPPORTED;
ed9eccbe
DS		 874 }
875
bc252fd1 876 ret = copy_to_user(arg, tmp, dev->n_subdevices * sizeof(*tmp));
ed9eccbe
DS		 877
878 kfree(tmp);
879
880 return ret ? -EFAULT : 0;
881}
882
883/*
884 COMEDI_CHANINFO
885 subdevice info ioctl
886
887 arg:
888 pointer to chaninfo structure
889
890 reads:
891 chaninfo structure at arg
892
893 writes:
894 arrays at elements of chaninfo structure
895
896*/
0a85b6f0 897static int do_chaninfo_ioctl(struct comedi_device *dev,
92d0127c 898 struct comedi_chaninfo __user *arg)
ed9eccbe 899{
34c43922 900 struct comedi_subdevice *s;
a18b416d 901 struct comedi_chaninfo it;
ed9eccbe 902
bc252fd1 903 if (copy_from_user(&it, arg, sizeof(it)))
ed9eccbe
DS		 904 return -EFAULT;
905
906 if (it.subdev >= dev->n_subdevices)
907 return -EINVAL;
b077f2cd 908 s = &dev->subdevices[it.subdev];
ed9eccbe
DS		 909
910 if (it.maxdata_list) {
911 if (s->maxdata || !s->maxdata_list)
912 return -EINVAL;
913 if (copy_to_user(it.maxdata_list, s->maxdata_list,
790c5541 914 s->n_chan * sizeof(unsigned int)))
ed9eccbe
DS		 915 return -EFAULT;
916 }
917
64d9b1d2
IA		 918 if (it.flaglist)
919 return -EINVAL; /* flaglist not supported */
ed9eccbe
DS		 920
921 if (it.rangelist) {
922 int i;
923
924 if (!s->range_table_list)
925 return -EINVAL;
926 for (i = 0; i < s->n_chan; i++) {
927 int x;
928
929 x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) |
476b8477 930 (s->range_table_list[i]->length);
81604d43
VK		 931 if (put_user(x, it.rangelist + i))
932 return -EFAULT;
ed9eccbe 933 }
476b8477
GKH		 934#if 0
935 if (copy_to_user(it.rangelist, s->range_type_list,
0a85b6f0 936 s->n_chan * sizeof(unsigned int)))
476b8477
GKH		 937 return -EFAULT;
938#endif
ed9eccbe
DS		 939 }
940
941 return 0;
942}
943
944 /*
945 COMEDI_BUFINFO
946 buffer information ioctl
947
948 arg:
949 pointer to bufinfo structure
950
951 reads:
952 bufinfo at arg
953
954 writes:
955 modified bufinfo at arg
956
957 */
92d0127c 958static int do_bufinfo_ioctl(struct comedi_device *dev,
53fa827e 959 struct comedi_bufinfo __user *arg, void *file)
ed9eccbe 960{
9aa5339a 961 struct comedi_bufinfo bi;
34c43922 962 struct comedi_subdevice *s;
d163679c 963 struct comedi_async *async;
ed9eccbe 964
bc252fd1 965 if (copy_from_user(&bi, arg, sizeof(bi)))
ed9eccbe
DS		 966 return -EFAULT;
967
7b1a5e2f 968 if (bi.subdevice >= dev->n_subdevices)
ed9eccbe
DS		 969 return -EINVAL;
970
b077f2cd 971 s = &dev->subdevices[bi.subdevice];
53fa827e 972
ed9eccbe
DS		 973 async = s->async;
974
975 if (!async) {
272850f0
HS		 976 dev_dbg(dev->class_dev,
977 "subdevice does not have async capability\n");
ed9eccbe
DS		 978 bi.buf_write_ptr = 0;
979 bi.buf_read_ptr = 0;
980 bi.buf_write_count = 0;
981 bi.buf_read_count = 0;
4772c018
IA		 982 bi.bytes_read = 0;
983 bi.bytes_written = 0;
ed9eccbe
DS		 984 goto copyback;
985 }
53fa827e
IA		 986 if (!s->busy) {
987 bi.bytes_read = 0;
988 bi.bytes_written = 0;
989 goto copyback_position;
990 }
991 if (s->busy != file)
992 return -EACCES;
ed9eccbe
DS		 993
994 if (bi.bytes_read && (s->subdev_flags & SDF_CMD_READ)) {
d13be55a 995 bi.bytes_read = comedi_buf_read_alloc(s, bi.bytes_read);
f1df8662 996 comedi_buf_read_free(s, bi.bytes_read);
ed9eccbe 997
9682e28c 998 if (comedi_is_subdevice_idle(s) &&
f4f3f7cf 999 comedi_buf_n_bytes_ready(s) == 0) {
ed9eccbe
DS		 1000 do_become_nonbusy(dev, s);
1001 }
1002 }
1003
1004 if (bi.bytes_written && (s->subdev_flags & SDF_CMD_WRITE)) {
1005 bi.bytes_written =
24e894bb 1006 comedi_buf_write_alloc(s, bi.bytes_written);
940dd35d 1007 comedi_buf_write_free(s, bi.bytes_written);
ed9eccbe
DS		 1008 }
1009
53fa827e 1010copyback_position:
ed9eccbe
DS		 1011 bi.buf_write_count = async->buf_write_count;
1012 bi.buf_write_ptr = async->buf_write_ptr;
1013 bi.buf_read_count = async->buf_read_count;
1014 bi.buf_read_ptr = async->buf_read_ptr;
1015
476b8477 1016copyback:
bc252fd1 1017 if (copy_to_user(arg, &bi, sizeof(bi)))
ed9eccbe
DS		 1018 return -EFAULT;
1019
1020 return 0;
1021}
1022
0a85b6f0
MT		 1023static int check_insn_config_length(struct comedi_insn *insn,
1024 unsigned int *data)
ed9eccbe 1025{
476b8477
GKH		 1026 if (insn->n < 1)
1027 return -EINVAL;
ed9eccbe
DS		 1028
1029 switch (data[0]) {
1030 case INSN_CONFIG_DIO_OUTPUT:
1031 case INSN_CONFIG_DIO_INPUT:
1032 case INSN_CONFIG_DISARM:
1033 case INSN_CONFIG_RESET:
1034 if (insn->n == 1)
1035 return 0;
1036 break;
1037 case INSN_CONFIG_ARM:
1038 case INSN_CONFIG_DIO_QUERY:
1039 case INSN_CONFIG_BLOCK_SIZE:
1040 case INSN_CONFIG_FILTER:
1041 case INSN_CONFIG_SERIAL_CLOCK:
1042 case INSN_CONFIG_BIDIRECTIONAL_DATA:
1043 case INSN_CONFIG_ALT_SOURCE:
1044 case INSN_CONFIG_SET_COUNTER_MODE:
1045 case INSN_CONFIG_8254_READ_STATUS:
1046 case INSN_CONFIG_SET_ROUTING:
1047 case INSN_CONFIG_GET_ROUTING:
1048 case INSN_CONFIG_GET_PWM_STATUS:
1049 case INSN_CONFIG_PWM_SET_PERIOD:
1050 case INSN_CONFIG_PWM_GET_PERIOD:
1051 if (insn->n == 2)
1052 return 0;
1053 break;
1054 case INSN_CONFIG_SET_GATE_SRC:
1055 case INSN_CONFIG_GET_GATE_SRC:
1056 case INSN_CONFIG_SET_CLOCK_SRC:
1057 case INSN_CONFIG_GET_CLOCK_SRC:
1058 case INSN_CONFIG_SET_OTHER_SRC:
1059 case INSN_CONFIG_GET_COUNTER_STATUS:
1060 case INSN_CONFIG_PWM_SET_H_BRIDGE:
1061 case INSN_CONFIG_PWM_GET_H_BRIDGE:
1062 case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE:
1063 if (insn->n == 3)
1064 return 0;
1065 break;
1066 case INSN_CONFIG_PWM_OUTPUT:
1067 case INSN_CONFIG_ANALOG_TRIG:
1068 if (insn->n == 5)
1069 return 0;
1070 break;
b0a2b6d8
IA		 1071 case INSN_CONFIG_DIGITAL_TRIG:
1072 if (insn->n == 6)
1073 return 0;
1074 break;
0a85b6f0
MT		 1075 /* by default we allow the insn since we don't have checks for
1076 * all possible cases yet */
ed9eccbe 1077 default:
c2ad078b 1078 pr_warn("No check for data length of config insn id %i is implemented\n",
4f870fe6 1079 data[0]);
c2ad078b
HS		 1080 pr_warn("Add a check to %s in %s\n", __func__, __FILE__);
1081 pr_warn("Assuming n=%i is correct\n", insn->n);
ed9eccbe 1082 return 0;
ed9eccbe
DS		 1083 }
1084 return -EINVAL;
1085}
1086
0a85b6f0
MT		 1087static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn,
1088 unsigned int *data, void *file)
ed9eccbe 1089{
34c43922 1090 struct comedi_subdevice *s;
ed9eccbe
DS		 1091 int ret = 0;
1092 int i;
1093
1094 if (insn->insn & INSN_MASK_SPECIAL) {
1095 /* a non-subdevice instruction */
1096
1097 switch (insn->insn) {
1098 case INSN_GTOD:
1099 {
1100 struct timeval tv;
1101
1102 if (insn->n != 2) {
1103 ret = -EINVAL;
1104 break;
1105 }
1106
1107 do_gettimeofday(&tv);
1108 data[0] = tv.tv_sec;
1109 data[1] = tv.tv_usec;
1110 ret = 2;
1111
1112 break;
1113 }
1114 case INSN_WAIT:
1115 if (insn->n != 1 || data[0] >= 100000) {
1116 ret = -EINVAL;
1117 break;
1118 }
1119 udelay(data[0] / 1000);
1120 ret = 1;
1121 break;
1122 case INSN_INTTRIG:
1123 if (insn->n != 1) {
1124 ret = -EINVAL;
1125 break;
1126 }
1127 if (insn->subdev >= dev->n_subdevices) {
272850f0
HS		 1128 dev_dbg(dev->class_dev,
1129 "%d not usable subdevice\n",
ed9eccbe
DS		 1130 insn->subdev);
1131 ret = -EINVAL;
1132 break;
1133 }
b077f2cd 1134 s = &dev->subdevices[insn->subdev];
ed9eccbe 1135 if (!s->async) {
272850f0 1136 dev_dbg(dev->class_dev, "no async\n");
ed9eccbe
DS		 1137 ret = -EINVAL;
1138 break;
1139 }
1140 if (!s->async->inttrig) {
272850f0 1141 dev_dbg(dev->class_dev, "no inttrig\n");
ed9eccbe
DS		 1142 ret = -EAGAIN;
1143 break;
1144 }
5d06e3df 1145 ret = s->async->inttrig(dev, s, data[0]);
ed9eccbe
DS		 1146 if (ret >= 0)
1147 ret = 1;
1148 break;
1149 default:
272850f0 1150 dev_dbg(dev->class_dev, "invalid insn\n");
ed9eccbe
DS		 1151 ret = -EINVAL;
1152 break;
1153 }
1154 } else {
1155 /* a subdevice instruction */
790c5541 1156 unsigned int maxdata;
ed9eccbe
DS		 1157
1158 if (insn->subdev >= dev->n_subdevices) {
272850f0
HS		 1159 dev_dbg(dev->class_dev, "subdevice %d out of range\n",
1160 insn->subdev);
ed9eccbe
DS		 1161 ret = -EINVAL;
1162 goto out;
1163 }
b077f2cd 1164 s = &dev->subdevices[insn->subdev];
ed9eccbe
DS		 1165
1166 if (s->type == COMEDI_SUBD_UNUSED) {
272850f0
HS		 1167 dev_dbg(dev->class_dev, "%d not usable subdevice\n",
1168 insn->subdev);
ed9eccbe
DS		 1169 ret = -EIO;
1170 goto out;
1171 }
1172
1173 /* are we locked? (ioctl lock) */
1174 if (s->lock && s->lock != file) {
272850f0 1175 dev_dbg(dev->class_dev, "device locked\n");
ed9eccbe
DS		 1176 ret = -EACCES;
1177 goto out;
1178 }
1179
0fd0ca75 1180 ret = comedi_check_chanlist(s, 1, &insn->chanspec);
476b8477 1181 if (ret < 0) {
ed9eccbe 1182 ret = -EINVAL;
272850f0 1183 dev_dbg(dev->class_dev, "bad chanspec\n");
ed9eccbe
DS		 1184 goto out;
1185 }
1186
1187 if (s->busy) {
1188 ret = -EBUSY;
1189 goto out;
1190 }
1191 /* This looks arbitrary. It is. */
1192 s->busy = &parse_insn;
1193 switch (insn->insn) {
1194 case INSN_READ:
1195 ret = s->insn_read(dev, s, insn, data);
22ca19d9
HS		 1196 if (ret == -ETIMEDOUT) {
1197 dev_dbg(dev->class_dev,
1198 "subdevice %d read instruction timed out\n",
1199 s->index);
1200 }
ed9eccbe
DS		 1201 break;
1202 case INSN_WRITE:
1203 maxdata = s->maxdata_list
476b8477
GKH		 1204 ? s->maxdata_list[CR_CHAN(insn->chanspec)]
1205 : s->maxdata;
ed9eccbe
DS		 1206 for (i = 0; i < insn->n; ++i) {
1207 if (data[i] > maxdata) {
1208 ret = -EINVAL;
272850f0
HS		 1209 dev_dbg(dev->class_dev,
1210 "bad data value(s)\n");
ed9eccbe
DS		 1211 break;
1212 }
1213 }
22ca19d9 1214 if (ret == 0) {
ed9eccbe 1215 ret = s->insn_write(dev, s, insn, data);
22ca19d9
HS		 1216 if (ret == -ETIMEDOUT) {
1217 dev_dbg(dev->class_dev,
1218 "subdevice %d write instruction timed out\n",
1219 s->index);
1220 }
1221 }
ed9eccbe
DS		 1222 break;
1223 case INSN_BITS:
1224 if (insn->n != 2) {
1225 ret = -EINVAL;
2f644ccf
IA		 1226 } else {
1227 /* Most drivers ignore the base channel in
1228 * insn->chanspec. Fix this here if
1229 * the subdevice has <= 32 channels. */
36efbacd
HS		 1230 unsigned int orig_mask = data[0];
1231 unsigned int shift = 0;
2f644ccf 1232
2f644ccf
IA		 1233 if (s->n_chan <= 32) {
1234 shift = CR_CHAN(insn->chanspec);
1235 if (shift > 0) {
1236 insn->chanspec = 0;
1237 data[0] <<= shift;
1238 data[1] <<= shift;
1239 }
36efbacd 1240 }
2f644ccf
IA		 1241 ret = s->insn_bits(dev, s, insn, data);
1242 data[0] = orig_mask;
1243 if (shift > 0)
1244 data[1] >>= shift;
ed9eccbe 1245 }
ed9eccbe
DS		 1246 break;
1247 case INSN_CONFIG:
1248 ret = check_insn_config_length(insn, data);
1249 if (ret)
1250 break;
1251 ret = s->insn_config(dev, s, insn, data);
1252 break;
1253 default:
1254 ret = -EINVAL;
1255 break;
1256 }
1257
1258 s->busy = NULL;
1259 }
1260
476b8477 1261out:
ed9eccbe
DS		 1262 return ret;
1263}
1264
5b6cbd87
HS		 1265/*
1266 * COMEDI_INSNLIST
1267 * synchronous instructions
1268 *
1269 * arg:
1270 * pointer to sync cmd structure
1271 *
1272 * reads:
1273 * sync cmd struct at arg
1274 * instruction list
1275 * data (for writes)
1276 *
1277 * writes:
1278 * data (for reads)
1279 */
1280/* arbitrary limits */
1281#define MAX_SAMPLES 256
1282static int do_insnlist_ioctl(struct comedi_device *dev,
1283 struct comedi_insnlist __user *arg, void *file)
1284{
1285 struct comedi_insnlist insnlist;
1286 struct comedi_insn *insns = NULL;
1287 unsigned int *data = NULL;
1288 int i = 0;
1289 int ret = 0;
1290
1291 if (copy_from_user(&insnlist, arg, sizeof(insnlist)))
1292 return -EFAULT;
1293
f4a8f528 1294 data = kmalloc_array(MAX_SAMPLES, sizeof(unsigned int), GFP_KERNEL);
5b6cbd87 1295 if (!data) {
5b6cbd87
HS		 1296 ret = -ENOMEM;
1297 goto error;
1298 }
1299
1300 insns = kcalloc(insnlist.n_insns, sizeof(*insns), GFP_KERNEL);
1301 if (!insns) {
5b6cbd87
HS		 1302 ret = -ENOMEM;
1303 goto error;
1304 }
1305
1306 if (copy_from_user(insns, insnlist.insns,
1307 sizeof(*insns) * insnlist.n_insns)) {
272850f0 1308 dev_dbg(dev->class_dev, "copy_from_user failed\n");
5b6cbd87
HS		 1309 ret = -EFAULT;
1310 goto error;
1311 }
1312
1313 for (i = 0; i < insnlist.n_insns; i++) {
1314 if (insns[i].n > MAX_SAMPLES) {
272850f0
HS		 1315 dev_dbg(dev->class_dev,
1316 "number of samples too large\n");
5b6cbd87
HS		 1317 ret = -EINVAL;
1318 goto error;
1319 }
1320 if (insns[i].insn & INSN_MASK_WRITE) {
1321 if (copy_from_user(data, insns[i].data,
1322 insns[i].n * sizeof(unsigned int))) {
272850f0
HS		 1323 dev_dbg(dev->class_dev,
1324 "copy_from_user failed\n");
5b6cbd87
HS		 1325 ret = -EFAULT;
1326 goto error;
1327 }
1328 }
1329 ret = parse_insn(dev, insns + i, data, file);
1330 if (ret < 0)
1331 goto error;
1332 if (insns[i].insn & INSN_MASK_READ) {
1333 if (copy_to_user(insns[i].data, data,
1334 insns[i].n * sizeof(unsigned int))) {
272850f0
HS		 1335 dev_dbg(dev->class_dev,
1336 "copy_to_user failed\n");
5b6cbd87
HS		 1337 ret = -EFAULT;
1338 goto error;
1339 }
1340 }
1341 if (need_resched())
1342 schedule();
1343 }
1344
1345error:
1346 kfree(insns);
1347 kfree(data);
1348
1349 if (ret < 0)
1350 return ret;
1351 return i;
1352}
1353
ed9eccbe 1354/*
20617f22
PDP		 1355 * COMEDI_INSN
1356 * synchronous instructions
ed9eccbe 1357 *
20617f22
PDP		 1358 * arg:
1359 * pointer to insn
ed9eccbe 1360 *
20617f22
PDP		 1361 * reads:
1362 * struct comedi_insn struct at arg
1363 * data (for writes)
ed9eccbe 1364 *
20617f22
PDP		 1365 * writes:
1366 * data (for reads)
ed9eccbe 1367 */
92d0127c
GKH		 1368static int do_insn_ioctl(struct comedi_device *dev,
1369 struct comedi_insn __user *arg, void *file)
ed9eccbe 1370{
90035c08 1371 struct comedi_insn insn;
790c5541 1372 unsigned int *data = NULL;
ed9eccbe
DS		 1373 int ret = 0;
1374
f4a8f528 1375 data = kmalloc_array(MAX_SAMPLES, sizeof(unsigned int), GFP_KERNEL);
ed9eccbe
DS		 1376 if (!data) {
1377 ret = -ENOMEM;
1378 goto error;
1379 }
1380
bc252fd1 1381 if (copy_from_user(&insn, arg, sizeof(insn))) {
ed9eccbe
DS		 1382 ret = -EFAULT;
1383 goto error;
1384 }
1385
1386 /* This is where the behavior of insn and insnlist deviate. */
1387 if (insn.n > MAX_SAMPLES)
1388 insn.n = MAX_SAMPLES;
1389 if (insn.insn & INSN_MASK_WRITE) {
21fe2eea
M		 1390 if (copy_from_user(data,
1391 insn.data,
1392 insn.n * sizeof(unsigned int))) {
ed9eccbe
DS		 1393 ret = -EFAULT;
1394 goto error;
1395 }
1396 }
1397 ret = parse_insn(dev, &insn, data, file);
1398 if (ret < 0)
1399 goto error;
1400 if (insn.insn & INSN_MASK_READ) {
21fe2eea
M		 1401 if (copy_to_user(insn.data,
1402 data,
1403 insn.n * sizeof(unsigned int))) {
ed9eccbe
DS		 1404 ret = -EFAULT;
1405 goto error;
1406 }
1407 }
1408 ret = insn.n;
1409
476b8477
GKH		 1410error:
1411 kfree(data);
ed9eccbe
DS		 1412
1413 return ret;
1414}
1415
87ece583
HS		 1416static int __comedi_get_user_cmd(struct comedi_device *dev,
1417 struct comedi_cmd __user *arg,
1418 struct comedi_cmd *cmd)
ed9eccbe 1419{
34c43922 1420 struct comedi_subdevice *s;
ed9eccbe 1421
87ece583 1422 if (copy_from_user(cmd, arg, sizeof(*cmd))) {
272850f0 1423 dev_dbg(dev->class_dev, "bad cmd address\n");
ed9eccbe
DS		 1424 return -EFAULT;
1425 }
ed9eccbe 1426
87ece583
HS		 1427 if (cmd->subdev >= dev->n_subdevices) {
1428 dev_dbg(dev->class_dev, "%d no such subdevice\n", cmd->subdev);
ed9eccbe
DS		 1429 return -ENODEV;
1430 }
1431
87ece583 1432 s = &dev->subdevices[cmd->subdev];
ed9eccbe
DS		 1433
1434 if (s->type == COMEDI_SUBD_UNUSED) {
b2f48741
YD		 1435 dev_dbg(dev->class_dev, "%d not valid subdevice\n",
1436 cmd->subdev);
ed9eccbe
DS		 1437 return -EIO;
1438 }
1439
1440 if (!s->do_cmd || !s->do_cmdtest || !s->async) {
272850f0 1441 dev_dbg(dev->class_dev,
b2f48741
YD		 1442 "subdevice %d does not support commands\n",
1443 cmd->subdev);
ed9eccbe
DS		 1444 return -EIO;
1445 }
1446
87ece583
HS		 1447 /* make sure channel/gain list isn't too long */
1448 if (cmd->chanlist_len > s->len_chanlist) {
1449 dev_dbg(dev->class_dev, "channel/gain list too long %d > %d\n",
1450 cmd->chanlist_len, s->len_chanlist);
1451 return -EINVAL;
1452 }
1453
1454 return 0;
1455}
1456
c6cd0eef
HS		 1457static int __comedi_get_user_chanlist(struct comedi_device *dev,
1458 struct comedi_subdevice *s,
1459 unsigned int __user *user_chanlist,
1460 struct comedi_cmd *cmd)
1461{
1462 unsigned int *chanlist;
1463 int ret;
1464
238b5ad8 1465 cmd->chanlist = NULL;
c6cd0eef
HS		 1466 chanlist = memdup_user(user_chanlist,
1467 cmd->chanlist_len * sizeof(unsigned int));
1468 if (IS_ERR(chanlist))
1469 return PTR_ERR(chanlist);
1470
1471 /* make sure each element in channel/gain list is valid */
1472 ret = comedi_check_chanlist(s, cmd->chanlist_len, chanlist);
1473 if (ret < 0) {
1474 kfree(chanlist);
1475 return ret;
1476 }
1477
1478 cmd->chanlist = chanlist;
1479
1480 return 0;
1481}
1482
87ece583
HS		 1483static int do_cmd_ioctl(struct comedi_device *dev,
1484 struct comedi_cmd __user *arg, void *file)
1485{
1486 struct comedi_cmd cmd;
1487 struct comedi_subdevice *s;
1488 struct comedi_async *async;
1489 unsigned int __user *user_chanlist;
1490 int ret;
1491
1492 /* get the user's cmd and do some simple validation */
1493 ret = __comedi_get_user_cmd(dev, arg, &cmd);
1494 if (ret)
1495 return ret;
1496
1497 /* save user's chanlist pointer so it can be restored later */
1498 user_chanlist = (unsigned int __user *)cmd.chanlist;
1499
1500 s = &dev->subdevices[cmd.subdev];
1501 async = s->async;
1502
ed9eccbe
DS		 1503 /* are we locked? (ioctl lock) */
1504 if (s->lock && s->lock != file) {
272850f0 1505 dev_dbg(dev->class_dev, "subdevice locked\n");
ed9eccbe
DS		 1506 return -EACCES;
1507 }
1508
1509 /* are we busy? */
1510 if (s->busy) {
272850f0 1511 dev_dbg(dev->class_dev, "subdevice busy\n");
ed9eccbe
DS		 1512 return -EBUSY;
1513 }
ed9eccbe 1514
ed9eccbe 1515 /* make sure channel/gain list isn't too short */
88bc0574 1516 if (cmd.chanlist_len < 1) {
272850f0 1517 dev_dbg(dev->class_dev, "channel/gain list too short %u < 1\n",
88bc0574 1518 cmd.chanlist_len);
4b18f08b 1519 return -EINVAL;
ed9eccbe
DS		 1520 }
1521
88bc0574 1522 async->cmd = cmd;
ed9eccbe 1523 async->cmd.data = NULL;
ed9eccbe 1524
c6cd0eef
HS		 1525 /* load channel/gain list */
1526 ret = __comedi_get_user_chanlist(dev, s, user_chanlist, &async->cmd);
1527 if (ret)
ed9eccbe 1528 goto cleanup;
ed9eccbe
DS		 1529
1530 ret = s->do_cmdtest(dev, s, &async->cmd);
1531
b0446a21 1532 if (async->cmd.flags & CMDF_BOGUS || ret) {
272850f0 1533 dev_dbg(dev->class_dev, "test returned %d\n", ret);
88bc0574 1534 cmd = async->cmd;
476b8477 1535 /* restore chanlist pointer before copying back */
95bc359f 1536 cmd.chanlist = (unsigned int __force *)user_chanlist;
88bc0574 1537 cmd.data = NULL;
bc252fd1 1538 if (copy_to_user(arg, &cmd, sizeof(cmd))) {
272850f0 1539 dev_dbg(dev->class_dev, "fault writing cmd\n");
ed9eccbe
DS		 1540 ret = -EFAULT;
1541 goto cleanup;
1542 }
1543 ret = -EAGAIN;
1544 goto cleanup;
1545 }
1546
1547 if (!async->prealloc_bufsz) {
1548 ret = -ENOMEM;
272850f0 1549 dev_dbg(dev->class_dev, "no buffer (?)\n");
ed9eccbe
DS		 1550 goto cleanup;
1551 }
1552
fcc18a9a 1553 comedi_buf_reset(s);
ed9eccbe
DS		 1554
1555 async->cb_mask =
476b8477
GKH		 1556 COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR |
1557 COMEDI_CB_OVERFLOW;
d8bff6e3 1558 if (async->cmd.flags & CMDF_WAKE_EOS)
ed9eccbe 1559 async->cb_mask |= COMEDI_CB_EOS;
ed9eccbe 1560
c265be01 1561 comedi_set_subdevice_runflags(s, SRF_ERROR | SRF_RUNNING, SRF_RUNNING);
ed9eccbe 1562
4b18f08b
IA		 1563 /* set s->busy _after_ setting SRF_RUNNING flag to avoid race with
1564 * comedi_read() or comedi_write() */
1565 s->busy = file;
ed9eccbe
DS		 1566 ret = s->do_cmd(dev, s);
1567 if (ret == 0)
1568 return 0;
1569
476b8477 1570cleanup:
ed9eccbe
DS		 1571 do_become_nonbusy(dev, s);
1572
1573 return ret;
1574}
1575
1576/*
1577 COMEDI_CMDTEST
1578 command testing ioctl
1579
1580 arg:
1581 pointer to cmd structure
1582
1583 reads:
1584 cmd structure at arg
1585 channel/range list
1586
1587 writes:
1588 modified cmd structure at arg
1589
1590*/
92d0127c
GKH		 1591static int do_cmdtest_ioctl(struct comedi_device *dev,
1592 struct comedi_cmd __user *arg, void *file)
ed9eccbe 1593{
f8348677 1594 struct comedi_cmd cmd;
34c43922 1595 struct comedi_subdevice *s;
95bc359f 1596 unsigned int __user *user_chanlist;
87ece583
HS		 1597 int ret;
1598
1599 /* get the user's cmd and do some simple validation */
1600 ret = __comedi_get_user_cmd(dev, arg, &cmd);
1601 if (ret)
1602 return ret;
ed9eccbe 1603
476b8477 1604 /* save user's chanlist pointer so it can be restored later */
95bc359f 1605 user_chanlist = (unsigned int __user *)cmd.chanlist;
ed9eccbe 1606
f8348677 1607 s = &dev->subdevices[cmd.subdev];
ed9eccbe 1608
6cab7a37
IA		 1609 /* user_chanlist can be NULL for COMEDI_CMDTEST ioctl */
1610 if (user_chanlist) {
1611 /* load channel/gain list */
1612 ret = __comedi_get_user_chanlist(dev, s, user_chanlist, &cmd);
1613 if (ret)
1614 return ret;
1615 }
ed9eccbe 1616
f8348677 1617 ret = s->do_cmdtest(dev, s, &cmd);
ed9eccbe 1618
238b5ad8
IA		 1619 kfree(cmd.chanlist); /* free kernel copy of user chanlist */
1620
476b8477 1621 /* restore chanlist pointer before copying back */
95bc359f 1622 cmd.chanlist = (unsigned int __force *)user_chanlist;
ed9eccbe 1623
bc252fd1 1624 if (copy_to_user(arg, &cmd, sizeof(cmd))) {
272850f0 1625 dev_dbg(dev->class_dev, "bad cmd address\n");
ed9eccbe 1626 ret = -EFAULT;
ed9eccbe 1627 }
c6cd0eef 1628
ed9eccbe
DS		 1629 return ret;
1630}
1631
1632/*
1633 COMEDI_LOCK
1634 lock subdevice
1635
1636 arg:
1637 subdevice number
1638
1639 reads:
1640 none
1641
1642 writes:
1643 none
1644
1645*/
1646
c1a6eac1 1647static int do_lock_ioctl(struct comedi_device *dev, unsigned long arg,
0a85b6f0 1648 void *file)
ed9eccbe
DS		 1649{
1650 int ret = 0;
1651 unsigned long flags;
34c43922 1652 struct comedi_subdevice *s;
ed9eccbe
DS		 1653
1654 if (arg >= dev->n_subdevices)
1655 return -EINVAL;
b077f2cd 1656 s = &dev->subdevices[arg];
ed9eccbe 1657
5f74ea14 1658 spin_lock_irqsave(&s->spin_lock, flags);
476b8477 1659 if (s->busy || s->lock)
ed9eccbe 1660 ret = -EBUSY;
476b8477 1661 else
ed9eccbe 1662 s->lock = file;
5f74ea14 1663 spin_unlock_irqrestore(&s->spin_lock, flags);
ed9eccbe 1664
ed9eccbe
DS		 1665 return ret;
1666}
1667
1668/*
1669 COMEDI_UNLOCK
1670 unlock subdevice
1671
1672 arg:
1673 subdevice number
1674
1675 reads:
1676 none
1677
1678 writes:
1679 none
1680
1681 This function isn't protected by the semaphore, since
1682 we already own the lock.
1683*/
c1a6eac1 1684static int do_unlock_ioctl(struct comedi_device *dev, unsigned long arg,
0a85b6f0 1685 void *file)
ed9eccbe 1686{
34c43922 1687 struct comedi_subdevice *s;
ed9eccbe
DS		 1688
1689 if (arg >= dev->n_subdevices)
1690 return -EINVAL;
b077f2cd 1691 s = &dev->subdevices[arg];
ed9eccbe
DS		 1692
1693 if (s->busy)
1694 return -EBUSY;
1695
1696 if (s->lock && s->lock != file)
1697 return -EACCES;
1698
90ac0764 1699 if (s->lock == file)
ed9eccbe 1700 s->lock = NULL;
ed9eccbe
DS		 1701
1702 return 0;
1703}
1704
1705/*
1706 COMEDI_CANCEL
1707 cancel acquisition ioctl
1708
1709 arg:
1710 subdevice number
1711
1712 reads:
1713 nothing
1714
1715 writes:
1716 nothing
1717
1718*/
c1a6eac1 1719static int do_cancel_ioctl(struct comedi_device *dev, unsigned long arg,
0a85b6f0 1720 void *file)
ed9eccbe 1721{
34c43922 1722 struct comedi_subdevice *s;
69acbaac 1723 int ret;
ed9eccbe
DS		 1724
1725 if (arg >= dev->n_subdevices)
1726 return -EINVAL;
b077f2cd 1727 s = &dev->subdevices[arg];
ed9eccbe
DS		 1728 if (s->async == NULL)
1729 return -EINVAL;
1730
ed9eccbe
DS		 1731 if (!s->busy)
1732 return 0;
1733
1734 if (s->busy != file)
1735 return -EBUSY;
1736
69acbaac 1737 ret = do_cancel(dev, s);
69acbaac
IA		 1738
1739 return ret;
ed9eccbe
DS		 1740}
1741
1742/*
1743 COMEDI_POLL ioctl
1744 instructs driver to synchronize buffers
1745
1746 arg:
1747 subdevice number
1748
1749 reads:
1750 nothing
1751
1752 writes:
1753 nothing
1754
1755*/
c1a6eac1 1756static int do_poll_ioctl(struct comedi_device *dev, unsigned long arg,
0a85b6f0 1757 void *file)
ed9eccbe 1758{
34c43922 1759 struct comedi_subdevice *s;
ed9eccbe
DS		 1760
1761 if (arg >= dev->n_subdevices)
1762 return -EINVAL;
b077f2cd 1763 s = &dev->subdevices[arg];
ed9eccbe 1764
ed9eccbe
DS		 1765 if (!s->busy)
1766 return 0;
1767
1768 if (s->busy != file)
1769 return -EBUSY;
1770
1771 if (s->poll)
1772 return s->poll(dev, s);
1773
1774 return -EINVAL;
1775}
1776
47db6d58
HS		 1777static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd,
1778 unsigned long arg)
1779{
6131ffaa 1780 const unsigned minor = iminor(file_inode(file));
e5d670dc 1781 struct comedi_device *dev = file->private_data;
47db6d58
HS		 1782 int rc;
1783
47db6d58
HS		 1784 mutex_lock(&dev->mutex);
1785
1786 /* Device config is special, because it must work on
1787 * an unconfigured device. */
1788 if (cmd == COMEDI_DEVCONFIG) {
754ab5c0
IA		 1789 if (minor >= COMEDI_NUM_BOARD_MINORS) {
1790 /* Device config not appropriate on non-board minors. */
1791 rc = -ENOTTY;
1792 goto done;
1793 }
47db6d58
HS		 1794 rc = do_devconfig_ioctl(dev,
1795 (struct comedi_devconfig __user *)arg);
8ab4ed6e
IA		 1796 if (rc == 0) {
1797 if (arg == 0 &&
1798 dev->minor >= comedi_num_legacy_minors) {
1799 /* Successfully unconfigured a dynamically
1800 * allocated device. Try and remove it. */
db210da2 1801 if (comedi_clear_board_dev(dev)) {
8ab4ed6e 1802 mutex_unlock(&dev->mutex);
cb6b79de 1803 comedi_free_board_dev(dev);
8ab4ed6e
IA		 1804 return rc;
1805 }
1806 }
1807 }
47db6d58
HS		 1808 goto done;
1809 }
1810
1811 if (!dev->attached) {
272850f0 1812 dev_dbg(dev->class_dev, "no driver attached\n");
47db6d58
HS		 1813 rc = -ENODEV;
1814 goto done;
1815 }
1816
1817 switch (cmd) {
1818 case COMEDI_BUFCONFIG:
1819 rc = do_bufconfig_ioctl(dev,
1820 (struct comedi_bufconfig __user *)arg);
1821 break;
1822 case COMEDI_DEVINFO:
1823 rc = do_devinfo_ioctl(dev, (struct comedi_devinfo __user *)arg,
1824 file);
1825 break;
1826 case COMEDI_SUBDINFO:
1827 rc = do_subdinfo_ioctl(dev,
1828 (struct comedi_subdinfo __user *)arg,
1829 file);
1830 break;
1831 case COMEDI_CHANINFO:
1832 rc = do_chaninfo_ioctl(dev, (void __user *)arg);
1833 break;
1834 case COMEDI_RANGEINFO:
1835 rc = do_rangeinfo_ioctl(dev, (void __user *)arg);
1836 break;
1837 case COMEDI_BUFINFO:
1838 rc = do_bufinfo_ioctl(dev,
1839 (struct comedi_bufinfo __user *)arg,
1840 file);
1841 break;
1842 case COMEDI_LOCK:
1843 rc = do_lock_ioctl(dev, arg, file);
1844 break;
1845 case COMEDI_UNLOCK:
1846 rc = do_unlock_ioctl(dev, arg, file);
1847 break;
1848 case COMEDI_CANCEL:
1849 rc = do_cancel_ioctl(dev, arg, file);
1850 break;
1851 case COMEDI_CMD:
1852 rc = do_cmd_ioctl(dev, (struct comedi_cmd __user *)arg, file);
1853 break;
1854 case COMEDI_CMDTEST:
1855 rc = do_cmdtest_ioctl(dev, (struct comedi_cmd __user *)arg,
1856 file);
1857 break;
1858 case COMEDI_INSNLIST:
1859 rc = do_insnlist_ioctl(dev,
1860 (struct comedi_insnlist __user *)arg,
1861 file);
1862 break;
1863 case COMEDI_INSN:
1864 rc = do_insn_ioctl(dev, (struct comedi_insn __user *)arg,
1865 file);
1866 break;
1867 case COMEDI_POLL:
1868 rc = do_poll_ioctl(dev, arg, file);
1869 break;
1870 default:
1871 rc = -ENOTTY;
1872 break;
1873 }
1874
1875done:
1876 mutex_unlock(&dev->mutex);
1877 return rc;
1878}
1879
df30b21c
FV		 1880static void comedi_vm_open(struct vm_area_struct *area)
1881{
af93da31 1882 struct comedi_buf_map *bm;
df30b21c 1883
af93da31
IA		 1884 bm = area->vm_private_data;
1885 comedi_buf_map_get(bm);
df30b21c
FV		 1886}
1887
1888static void comedi_vm_close(struct vm_area_struct *area)
ed9eccbe 1889{
af93da31 1890 struct comedi_buf_map *bm;
ed9eccbe 1891
af93da31
IA		 1892 bm = area->vm_private_data;
1893 comedi_buf_map_put(bm);
ed9eccbe
DS		 1894}
1895
1896static struct vm_operations_struct comedi_vm_ops = {
df30b21c
FV		 1897 .open = comedi_vm_open,
1898 .close = comedi_vm_close,
ed9eccbe
DS		 1899};
1900
1901static int comedi_mmap(struct file *file, struct vm_area_struct *vma)
1902{
6131ffaa 1903 const unsigned minor = iminor(file_inode(file));
e5d670dc 1904 struct comedi_device *dev = file->private_data;
a52840a9
HS		 1905 struct comedi_subdevice *s;
1906 struct comedi_async *async;
b34aa86f 1907 struct comedi_buf_map *bm = NULL;
ed9eccbe
DS		 1908 unsigned long start = vma->vm_start;
1909 unsigned long size;
1910 int n_pages;
1911 int i;
1912 int retval;
3ffab428 1913
b34aa86f
IA		 1914 /*
1915 * 'trylock' avoids circular dependency with current->mm->mmap_sem
1916 * and down-reading &dev->attach_lock should normally succeed without
1917 * contention unless the device is in the process of being attached
1918 * or detached.
1919 */
1920 if (!down_read_trylock(&dev->attach_lock))
1921 return -EAGAIN;
a52840a9 1922
ed9eccbe 1923 if (!dev->attached) {
272850f0 1924 dev_dbg(dev->class_dev, "no driver attached\n");
ed9eccbe
DS		 1925 retval = -ENODEV;
1926 goto done;
1927 }
a52840a9 1928
476b8477 1929 if (vma->vm_flags & VM_WRITE)
da56fdc6 1930 s = comedi_write_subdevice(dev, minor);
476b8477 1931 else
da56fdc6 1932 s = comedi_read_subdevice(dev, minor);
a52840a9 1933 if (!s) {
ed9eccbe
DS		 1934 retval = -EINVAL;
1935 goto done;
1936 }
a52840a9 1937
ed9eccbe 1938 async = s->async;
a52840a9 1939 if (!async) {
ed9eccbe
DS		 1940 retval = -EINVAL;
1941 goto done;
1942 }
1943
1944 if (vma->vm_pgoff != 0) {
272850f0 1945 dev_dbg(dev->class_dev, "mmap() offset must be 0.\n");
ed9eccbe
DS		 1946 retval = -EINVAL;
1947 goto done;
1948 }
1949
1950 size = vma->vm_end - vma->vm_start;
1951 if (size > async->prealloc_bufsz) {
1952 retval = -EFAULT;
1953 goto done;
1954 }
1955 if (size & (~PAGE_MASK)) {
1956 retval = -EFAULT;
1957 goto done;
1958 }
1959
1960 n_pages = size >> PAGE_SHIFT;
b34aa86f
IA		 1961
1962 /* get reference to current buf map (if any) */
1963 bm = comedi_buf_map_from_subdev_get(s);
af93da31
IA		 1964 if (!bm || n_pages > bm->n_pages) {
1965 retval = -EINVAL;
1966 goto done;
1967 }
ed9eccbe 1968 for (i = 0; i < n_pages; ++i) {
af93da31 1969 struct comedi_buf_page *buf = &bm->page_list[i];
a52840a9 1970
ed9eccbe 1971 if (remap_pfn_range(vma, start,
a52840a9
HS		 1972 page_to_pfn(virt_to_page(buf->virt_addr)),
1973 PAGE_SIZE, PAGE_SHARED)) {
ed9eccbe
DS		 1974 retval = -EAGAIN;
1975 goto done;
1976 }
1977 start += PAGE_SIZE;
1978 }
1979
1980 vma->vm_ops = &comedi_vm_ops;
af93da31 1981 vma->vm_private_data = bm;
ed9eccbe 1982
af93da31 1983 vma->vm_ops->open(vma);
ed9eccbe
DS		 1984
1985 retval = 0;
476b8477 1986done:
b34aa86f
IA		 1987 up_read(&dev->attach_lock);
1988 comedi_buf_map_put(bm); /* put reference to buf map - okay if NULL */
ed9eccbe
DS		 1989 return retval;
1990}
1991
1ae5062a 1992static unsigned int comedi_poll(struct file *file, poll_table *wait)
ed9eccbe
DS		 1993{
1994 unsigned int mask = 0;
6131ffaa 1995 const unsigned minor = iminor(file_inode(file));
e5d670dc 1996 struct comedi_device *dev = file->private_data;
ca081b1d 1997 struct comedi_subdevice *s;
3ffab428 1998
ed9eccbe 1999 mutex_lock(&dev->mutex);
ca081b1d 2000
ed9eccbe 2001 if (!dev->attached) {
272850f0 2002 dev_dbg(dev->class_dev, "no driver attached\n");
ca081b1d 2003 goto done;
ed9eccbe
DS		 2004 }
2005
da56fdc6 2006 s = comedi_read_subdevice(dev, minor);
cc400e18 2007 if (s && s->async) {
ca081b1d 2008 poll_wait(file, &s->async->wait_head, wait);
f0124630 2009 if (!s->busy || !comedi_is_subdevice_running(s) ||
e9edef3a 2010 comedi_buf_read_n_available(s) > 0)
ed9eccbe 2011 mask |= POLLIN | POLLRDNORM;
ed9eccbe 2012 }
ca081b1d 2013
da56fdc6 2014 s = comedi_write_subdevice(dev, minor);
cc400e18 2015 if (s && s->async) {
0ce016d0 2016 unsigned int bps = bytes_per_sample(s);
ca081b1d
HS		 2017
2018 poll_wait(file, &s->async->wait_head, wait);
24e894bb 2019 comedi_buf_write_alloc(s, s->async->prealloc_bufsz);
f0124630 2020 if (!s->busy || !comedi_is_subdevice_running(s) ||
0f1f34e8 2021 comedi_buf_write_n_allocated(s) >= bps)
ed9eccbe 2022 mask |= POLLOUT | POLLWRNORM;
ed9eccbe
DS		 2023 }
2024
ca081b1d 2025done:
ed9eccbe
DS		 2026 mutex_unlock(&dev->mutex);
2027 return mask;
2028}
2029
92d0127c
GKH		 2030static ssize_t comedi_write(struct file *file, const char __user *buf,
2031 size_t nbytes, loff_t *offset)
ed9eccbe 2032{
34c43922 2033 struct comedi_subdevice *s;
d163679c 2034 struct comedi_async *async;
ed9eccbe
DS		 2035 int n, m, count = 0, retval = 0;
2036 DECLARE_WAITQUEUE(wait, current);
6131ffaa 2037 const unsigned minor = iminor(file_inode(file));
e5d670dc 2038 struct comedi_device *dev = file->private_data;
9329f139
IA		 2039 bool on_wait_queue = false;
2040 bool attach_locked;
2041 unsigned int old_detach_count;
3ffab428 2042
9329f139
IA		 2043 /* Protect against device detachment during operation. */
2044 down_read(&dev->attach_lock);
2045 attach_locked = true;
2046 old_detach_count = dev->detach_count;
2047
ed9eccbe 2048 if (!dev->attached) {
272850f0 2049 dev_dbg(dev->class_dev, "no driver attached\n");
9329f139
IA		 2050 retval = -ENODEV;
2051 goto out;
ed9eccbe
DS		 2052 }
2053
da56fdc6 2054 s = comedi_write_subdevice(dev, minor);
9329f139
IA		 2055 if (!s || !s->async) {
2056 retval = -EIO;
2057 goto out;
2058 }
2714b019 2059
ed9eccbe
DS		 2060 async = s->async;
2061
2714b019 2062 if (!s->busy || !nbytes)
9329f139
IA		 2063 goto out;
2064 if (s->busy != file) {
2065 retval = -EACCES;
2066 goto out;
2067 }
2714b019 2068
ed9eccbe 2069 add_wait_queue(&async->wait_head, &wait);
9329f139 2070 on_wait_queue = true;
ed9eccbe
DS		 2071 while (nbytes > 0 && !retval) {
2072 set_current_state(TASK_INTERRUPTIBLE);
2073
f0124630 2074 if (!comedi_is_subdevice_running(s)) {
d2611540 2075 if (count == 0) {
9329f139
IA		 2076 struct comedi_subdevice *new_s;
2077
c098c21a 2078 if (comedi_is_subdevice_in_error(s))
d2611540 2079 retval = -EPIPE;
c098c21a 2080 else
d2611540 2081 retval = 0;
9329f139
IA		 2082 /*
2083 * To avoid deadlock, cannot acquire dev->mutex
2084 * while dev->attach_lock is held. Need to
2085 * remove task from the async wait queue before
2086 * releasing dev->attach_lock, as it might not
2087 * be valid afterwards.
2088 */
2089 remove_wait_queue(&async->wait_head, &wait);
2090 on_wait_queue = false;
2091 up_read(&dev->attach_lock);
2092 attach_locked = false;
2093 mutex_lock(&dev->mutex);
2094 /*
2095 * Become non-busy unless things have changed
2096 * behind our back. Checking dev->detach_count
2097 * is unchanged ought to be sufficient (unless
2098 * there have been 2**32 detaches in the
2099 * meantime!), but check the subdevice pointer
2100 * as well just in case.
2101 */
2102 new_s = comedi_write_subdevice(dev, minor);
2103 if (dev->attached &&
2104 old_detach_count == dev->detach_count &&
2105 s == new_s && new_s->async == async)
2106 do_become_nonbusy(dev, s);
4b18f08b 2107 mutex_unlock(&dev->mutex);
d2611540
IA		 2108 }
2109 break;
2110 }
2111
ed9eccbe
DS		 2112 n = nbytes;
2113
2114 m = n;
476b8477 2115 if (async->buf_write_ptr + m > async->prealloc_bufsz)
ed9eccbe 2116 m = async->prealloc_bufsz - async->buf_write_ptr;
24e894bb 2117 comedi_buf_write_alloc(s, async->prealloc_bufsz);
0f1f34e8
IA		 2118 if (m > comedi_buf_write_n_allocated(s))
2119 m = comedi_buf_write_n_allocated(s);
ed9eccbe
DS		 2120 if (m < n)
2121 n = m;
2122
2123 if (n == 0) {
ed9eccbe
DS		 2124 if (file->f_flags & O_NONBLOCK) {
2125 retval = -EAGAIN;
2126 break;
2127 }
6a9ce6b6 2128 schedule();
ed9eccbe
DS		 2129 if (signal_pending(current)) {
2130 retval = -ERESTARTSYS;
2131 break;
2132 }
476b8477 2133 if (!s->busy)
ed9eccbe 2134 break;
ed9eccbe
DS		 2135 if (s->busy != file) {
2136 retval = -EACCES;
2137 break;
2138 }
2139 continue;
2140 }
2141
2142 m = copy_from_user(async->prealloc_buf + async->buf_write_ptr,
476b8477 2143 buf, n);
ed9eccbe
DS		 2144 if (m) {
2145 n -= m;
2146 retval = -EFAULT;
2147 }
940dd35d 2148 comedi_buf_write_free(s, n);
ed9eccbe
DS		 2149
2150 count += n;
2151 nbytes -= n;
2152
2153 buf += n;
2154 break; /* makes device work like a pipe */
2155 }
9329f139
IA		 2156out:
2157 if (on_wait_queue)
2158 remove_wait_queue(&async->wait_head, &wait);
ed9eccbe 2159 set_current_state(TASK_RUNNING);
9329f139
IA		 2160 if (attach_locked)
2161 up_read(&dev->attach_lock);
ed9eccbe 2162
476b8477 2163 return count ? count : retval;
ed9eccbe
DS		 2164}
2165
92d0127c 2166static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes,
36efbacd 2167 loff_t *offset)
ed9eccbe 2168{
34c43922 2169 struct comedi_subdevice *s;
d163679c 2170 struct comedi_async *async;
ed9eccbe
DS		 2171 int n, m, count = 0, retval = 0;
2172 DECLARE_WAITQUEUE(wait, current);
6131ffaa 2173 const unsigned minor = iminor(file_inode(file));
e5d670dc 2174 struct comedi_device *dev = file->private_data;
45c2bc55
IA		 2175 unsigned int old_detach_count;
2176 bool become_nonbusy = false;
2177 bool attach_locked;
3ffab428 2178
45c2bc55
IA		 2179 /* Protect against device detachment during operation. */
2180 down_read(&dev->attach_lock);
2181 attach_locked = true;
2182 old_detach_count = dev->detach_count;
2183
ed9eccbe 2184 if (!dev->attached) {
272850f0 2185 dev_dbg(dev->class_dev, "no driver attached\n");
45c2bc55
IA		 2186 retval = -ENODEV;
2187 goto out;
ed9eccbe
DS		 2188 }
2189
da56fdc6 2190 s = comedi_read_subdevice(dev, minor);
45c2bc55
IA		 2191 if (!s || !s->async) {
2192 retval = -EIO;
2193 goto out;
2194 }
5c87fef5 2195
ed9eccbe 2196 async = s->async;
5c87fef5 2197 if (!s->busy || !nbytes)
45c2bc55
IA		 2198 goto out;
2199 if (s->busy != file) {
2200 retval = -EACCES;
2201 goto out;
2202 }
ed9eccbe
DS		 2203
2204 add_wait_queue(&async->wait_head, &wait);
2205 while (nbytes > 0 && !retval) {
2206 set_current_state(TASK_INTERRUPTIBLE);
2207
2208 n = nbytes;
2209
e9edef3a 2210 m = comedi_buf_read_n_available(s);
476b8477 2211 if (async->buf_read_ptr + m > async->prealloc_bufsz)
ed9eccbe 2212 m = async->prealloc_bufsz - async->buf_read_ptr;
ed9eccbe
DS		 2213 if (m < n)
2214 n = m;
2215
2216 if (n == 0) {
f0124630 2217 if (!comedi_is_subdevice_running(s)) {
c098c21a 2218 if (comedi_is_subdevice_in_error(s))
ed9eccbe 2219 retval = -EPIPE;
c098c21a 2220 else
ed9eccbe 2221 retval = 0;
45c2bc55 2222 become_nonbusy = true;
ed9eccbe
DS		 2223 break;
2224 }
2225 if (file->f_flags & O_NONBLOCK) {
2226 retval = -EAGAIN;
2227 break;
2228 }
6a9ce6b6 2229 schedule();
ed9eccbe
DS		 2230 if (signal_pending(current)) {
2231 retval = -ERESTARTSYS;
2232 break;
2233 }
ed9eccbe
DS		 2234 if (!s->busy) {
2235 retval = 0;
2236 break;
2237 }
2238 if (s->busy != file) {
2239 retval = -EACCES;
2240 break;
2241 }
2242 continue;
2243 }
2244 m = copy_to_user(buf, async->prealloc_buf +
476b8477 2245 async->buf_read_ptr, n);
ed9eccbe
DS		 2246 if (m) {
2247 n -= m;
2248 retval = -EFAULT;
2249 }
2250
d13be55a 2251 comedi_buf_read_alloc(s, n);
f1df8662 2252 comedi_buf_read_free(s, n);
ed9eccbe
DS		 2253
2254 count += n;
2255 nbytes -= n;
2256
2257 buf += n;
2258 break; /* makes device work like a pipe */
2259 }
45c2bc55
IA		 2260 remove_wait_queue(&async->wait_head, &wait);
2261 set_current_state(TASK_RUNNING);
2262 if (become_nonbusy || comedi_is_subdevice_idle(s)) {
2263 struct comedi_subdevice *new_s;
2264
2265 /*
2266 * To avoid deadlock, cannot acquire dev->mutex
2267 * while dev->attach_lock is held.
2268 */
2269 up_read(&dev->attach_lock);
2270 attach_locked = false;
4b18f08b 2271 mutex_lock(&dev->mutex);
45c2bc55
IA		 2272 /*
2273 * Check device hasn't become detached behind our back.
2274 * Checking dev->detach_count is unchanged ought to be
2275 * sufficient (unless there have been 2**32 detaches in the
2276 * meantime!), but check the subdevice pointer as well just in
2277 * case.
2278 */
2279 new_s = comedi_read_subdevice(dev, minor);
2280 if (dev->attached && old_detach_count == dev->detach_count &&
2281 s == new_s && new_s->async == async) {
f4f3f7cf 2282 if (become_nonbusy || comedi_buf_n_bytes_ready(s) == 0)
45c2bc55
IA		 2283 do_become_nonbusy(dev, s);
2284 }
4b18f08b 2285 mutex_unlock(&dev->mutex);
ed9eccbe 2286 }
45c2bc55
IA		 2287out:
2288 if (attach_locked)
2289 up_read(&dev->attach_lock);
ed9eccbe 2290
476b8477 2291 return count ? count : retval;
ed9eccbe
DS		 2292}
2293
ed9eccbe
DS		 2294static int comedi_open(struct inode *inode, struct file *file)
2295{
ed9eccbe 2296 const unsigned minor = iminor(inode);
fc406986
IA		 2297 struct comedi_device *dev = comedi_dev_get_from_minor(minor);
2298 int rc;
97920071 2299
4da5fa9a 2300 if (!dev) {
272850f0 2301 pr_debug("invalid minor number\n");
ed9eccbe
DS		 2302 return -ENODEV;
2303 }
2304
ed9eccbe 2305 mutex_lock(&dev->mutex);
a8f80e8f 2306 if (!dev->attached && !capable(CAP_NET_ADMIN)) {
272850f0 2307 dev_dbg(dev->class_dev, "not attached and not CAP_NET_ADMIN\n");
fc406986
IA		 2308 rc = -ENODEV;
2309 goto out;
ed9eccbe 2310 }
1363e4fb 2311 if (dev->attached && dev->use_count == 0) {
ed9eccbe 2312 if (!try_module_get(dev->driver->module)) {
fc406986
IA		 2313 rc = -ENOSYS;
2314 goto out;
ed9eccbe 2315 }
1363e4fb
IA		 2316 if (dev->open) {
2317 rc = dev->open(dev);
2318 if (rc < 0) {
2319 module_put(dev->driver->module);
2320 goto out;
2321 }
3c17ba07
IA		 2322 }
2323 }
ed9eccbe
DS		 2324
2325 dev->use_count++;
e5d670dc 2326 file->private_data = dev;
fc406986 2327 rc = 0;
ed9eccbe 2328
fc406986 2329out:
a5011a26 2330 mutex_unlock(&dev->mutex);
fc406986
IA		 2331 if (rc)
2332 comedi_dev_put(dev);
2333 return rc;
ed9eccbe
DS		 2334}
2335
2aae0076
HS		 2336static int comedi_fasync(int fd, struct file *file, int on)
2337{
e5d670dc 2338 struct comedi_device *dev = file->private_data;
2aae0076
HS		 2339
2340 return fasync_helper(fd, file, on, &dev->async_queue);
2341}
2342
a5011a26 2343static int comedi_close(struct inode *inode, struct file *file)
ed9eccbe 2344{
e5d670dc 2345 struct comedi_device *dev = file->private_data;
a5011a26 2346 struct comedi_subdevice *s = NULL;
ed9eccbe
DS		 2347 int i;
2348
a5011a26
HS		 2349 mutex_lock(&dev->mutex);
2350
2351 if (dev->subdevices) {
2352 for (i = 0; i < dev->n_subdevices; i++) {
b077f2cd 2353 s = &dev->subdevices[i];
a5011a26
HS		 2354
2355 if (s->busy == file)
2356 do_cancel(dev, s);
2357 if (s->lock == file)
2358 s->lock = NULL;
2359 }
ed9eccbe 2360 }
1363e4fb
IA		 2361 if (dev->attached && dev->use_count == 1) {
2362 if (dev->close)
2363 dev->close(dev);
a5011a26 2364 module_put(dev->driver->module);
1363e4fb 2365 }
a5011a26
HS		 2366
2367 dev->use_count--;
2368
2369 mutex_unlock(&dev->mutex);
fc406986 2370 comedi_dev_put(dev);
a5011a26 2371
ed9eccbe
DS		 2372 return 0;
2373}
2374
8cb8aad7 2375static const struct file_operations comedi_fops = {
a5011a26
HS		 2376 .owner = THIS_MODULE,
2377 .unlocked_ioctl = comedi_unlocked_ioctl,
2378 .compat_ioctl = comedi_compat_ioctl,
2379 .open = comedi_open,
2380 .release = comedi_close,
2381 .read = comedi_read,
2382 .write = comedi_write,
2383 .mmap = comedi_mmap,
2384 .poll = comedi_poll,
2385 .fasync = comedi_fasync,
2386 .llseek = noop_llseek,
2387};
2388
a5011a26 2389void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s)
883db3d9 2390{
a5011a26
HS		 2391 struct comedi_async *async = s->async;
2392 unsigned runflags = 0;
2393 unsigned runflags_mask = 0;
883db3d9 2394
f0124630 2395 if (!comedi_is_subdevice_running(s))
a5011a26
HS		 2396 return;
2397
2398 if (s->
2399 async->events & (COMEDI_CB_EOA | COMEDI_CB_ERROR |
2400 COMEDI_CB_OVERFLOW)) {
2401 runflags_mask |= SRF_RUNNING;
883db3d9 2402 }
a5011a26
HS		 2403 /* remember if an error event has occurred, so an error
2404 * can be returned the next time the user does a read() */
2405 if (s->async->events & (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) {
2406 runflags_mask |= SRF_ERROR;
2407 runflags |= SRF_ERROR;
883db3d9 2408 }
a5011a26
HS		 2409 if (runflags_mask) {
2410 /*sets SRF_ERROR and SRF_RUNNING together atomically */
2411 comedi_set_subdevice_runflags(s, runflags_mask, runflags);
883db3d9
FMH		 2412 }
2413
a5011a26 2414 if (async->cb_mask & s->async->events) {
c265be01
IA		 2415 wake_up_interruptible(&async->wait_head);
2416 if (s->subdev_flags & SDF_CMD_READ)
2417 kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
2418 if (s->subdev_flags & SDF_CMD_WRITE)
2419 kill_fasync(&dev->async_queue, SIGIO, POLL_OUT);
a5011a26
HS		 2420 }
2421 s->async->events = 0;
883db3d9 2422}
5660e742 2423EXPORT_SYMBOL_GPL(comedi_event);
883db3d9 2424
07778393 2425/* Note: the ->mutex is pre-locked on successful return */
7638ffcb 2426struct comedi_device *comedi_alloc_board_minor(struct device *hardware_device)
a5011a26 2427{
7638ffcb 2428 struct comedi_device *dev;
a5011a26
HS		 2429 struct device *csdev;
2430 unsigned i;
a5011a26 2431
36efbacd 2432 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
cb6b79de 2433 if (dev == NULL)
7638ffcb 2434 return ERR_PTR(-ENOMEM);
7638ffcb 2435 comedi_device_init(dev);
db2e3487 2436 comedi_set_hw_dev(dev, hardware_device);
07778393 2437 mutex_lock(&dev->mutex);
5b7dba1b 2438 mutex_lock(&comedi_board_minor_table_lock);
38b9722a
IA		 2439 for (i = hardware_device ? comedi_num_legacy_minors : 0;
2440 i < COMEDI_NUM_BOARD_MINORS; ++i) {
5b7dba1b 2441 if (comedi_board_minor_table[i] == NULL) {
cb6b79de 2442 comedi_board_minor_table[i] = dev;
a5011a26
HS		 2443 break;
2444 }
2445 }
5b7dba1b 2446 mutex_unlock(&comedi_board_minor_table_lock);
a5011a26 2447 if (i == COMEDI_NUM_BOARD_MINORS) {
07778393 2448 mutex_unlock(&dev->mutex);
7638ffcb 2449 comedi_device_cleanup(dev);
5b13ed94 2450 comedi_dev_put(dev);
c2ad078b 2451 pr_err("ran out of minor numbers for board device files\n");
7638ffcb 2452 return ERR_PTR(-EBUSY);
a5011a26 2453 }
7638ffcb 2454 dev->minor = i;
a5011a26
HS		 2455 csdev = device_create(comedi_class, hardware_device,
2456 MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i", i);
2457 if (!IS_ERR(csdev))
8f988d87 2458 dev->class_dev = get_device(csdev);
883db3d9 2459
07778393 2460 /* Note: dev->mutex needs to be unlocked by the caller. */
7638ffcb 2461 return dev;
883db3d9
FMH		 2462}
2463
70f30c37 2464static void comedi_free_board_minor(unsigned minor)
24fb134d
IA		 2465{
2466 BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS);
cb6b79de 2467 comedi_free_board_dev(comedi_clear_board_minor(minor));
24fb134d
IA		 2468}
2469
3346b798 2470void comedi_release_hardware_device(struct device *hardware_device)
883db3d9 2471{
a5011a26 2472 int minor;
cb6b79de 2473 struct comedi_device *dev;
883db3d9 2474
38b9722a
IA		 2475 for (minor = comedi_num_legacy_minors; minor < COMEDI_NUM_BOARD_MINORS;
2476 minor++) {
5b7dba1b 2477 mutex_lock(&comedi_board_minor_table_lock);
cb6b79de
IA		 2478 dev = comedi_board_minor_table[minor];
2479 if (dev && dev->hw_dev == hardware_device) {
5b7dba1b
IA		 2480 comedi_board_minor_table[minor] = NULL;
2481 mutex_unlock(&comedi_board_minor_table_lock);
cb6b79de 2482 comedi_free_board_dev(dev);
3346b798 2483 break;
a5011a26 2484 }
5b7dba1b 2485 mutex_unlock(&comedi_board_minor_table_lock);
883db3d9 2486 }
883db3d9
FMH		 2487}
2488
f65cc544 2489int comedi_alloc_subdevice_minor(struct comedi_subdevice *s)
883db3d9 2490{
f65cc544 2491 struct comedi_device *dev = s->device;
a5011a26
HS		 2492 struct device *csdev;
2493 unsigned i;
883db3d9 2494
5b7dba1b
IA		 2495 mutex_lock(&comedi_subdevice_minor_table_lock);
2496 for (i = 0; i < COMEDI_NUM_SUBDEVICE_MINORS; ++i) {
2497 if (comedi_subdevice_minor_table[i] == NULL) {
bd5b4173 2498 comedi_subdevice_minor_table[i] = s;
a5011a26
HS		 2499 break;
2500 }
2501 }
5b7dba1b
IA		 2502 mutex_unlock(&comedi_subdevice_minor_table_lock);
2503 if (i == COMEDI_NUM_SUBDEVICE_MINORS) {
c2ad078b 2504 pr_err("ran out of minor numbers for subdevice files\n");
a5011a26
HS		 2505 return -EBUSY;
2506 }
5b7dba1b 2507 i += COMEDI_NUM_BOARD_MINORS;
a5011a26
HS		 2508 s->minor = i;
2509 csdev = device_create(comedi_class, dev->class_dev,
2510 MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i_subd%i",
90a35c15 2511 dev->minor, s->index);
a5011a26
HS		 2512 if (!IS_ERR(csdev))
2513 s->class_dev = csdev;
883db3d9 2514
da718546 2515 return 0;
883db3d9
FMH		 2516}
2517
a5011a26 2518void comedi_free_subdevice_minor(struct comedi_subdevice *s)
883db3d9 2519{
0fcc9d48 2520 unsigned int i;
883db3d9 2521
a5011a26
HS		 2522 if (s == NULL)
2523 return;
2524 if (s->minor < 0)
2525 return;
883db3d9 2526
a5011a26 2527 BUG_ON(s->minor >= COMEDI_NUM_MINORS);
8907cf6c 2528 BUG_ON(s->minor < COMEDI_NUM_BOARD_MINORS);
883db3d9 2529
0fcc9d48
IA		 2530 i = s->minor - COMEDI_NUM_BOARD_MINORS;
2531 mutex_lock(&comedi_subdevice_minor_table_lock);
bd5b4173
IA		 2532 if (s == comedi_subdevice_minor_table[i])
2533 comedi_subdevice_minor_table[i] = NULL;
0fcc9d48 2534 mutex_unlock(&comedi_subdevice_minor_table_lock);
a5011a26
HS		 2535 if (s->class_dev) {
2536 device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor));
2537 s->class_dev = NULL;
883db3d9 2538 }
883db3d9 2539}
a5787824 2540
682b9119 2541static void comedi_cleanup_board_minors(void)
76cca89f
HS		 2542{
2543 unsigned i;
2544
682b9119 2545 for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++)
76cca89f
HS		 2546 comedi_free_board_minor(i);
2547}
2548
91fa0b0c
HS		 2549static int __init comedi_init(void)
2550{
2551 int i;
2552 int retval;
2553
c2ad078b 2554 pr_info("version " COMEDI_RELEASE " - http://www.comedi.org\n");
91fa0b0c
HS		 2555
2556 if (comedi_num_legacy_minors < 0 ||
2557 comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) {
c2ad078b 2558 pr_err("invalid value for module parameter \"comedi_num_legacy_minors\". Valid values are 0 through %i.\n",
91fa0b0c
HS		 2559 COMEDI_NUM_BOARD_MINORS);
2560 return -EINVAL;
2561 }
2562
91fa0b0c
HS		 2563 retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2564 COMEDI_NUM_MINORS, "comedi");
2565 if (retval)
2566 return -EIO;
2567 cdev_init(&comedi_cdev, &comedi_fops);
2568 comedi_cdev.owner = THIS_MODULE;
a5bde3a1
AP		 2569
2570 retval = kobject_set_name(&comedi_cdev.kobj, "comedi");
2571 if (retval) {
2572 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2573 COMEDI_NUM_MINORS);
2574 return retval;
2575 }
2576
91fa0b0c
HS		 2577 if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) {
2578 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2579 COMEDI_NUM_MINORS);
2580 return -EIO;
2581 }
2582 comedi_class = class_create(THIS_MODULE, "comedi");
2583 if (IS_ERR(comedi_class)) {
c2ad078b 2584 pr_err("failed to create class\n");
91fa0b0c
HS		 2585 cdev_del(&comedi_cdev);
2586 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2587 COMEDI_NUM_MINORS);
2588 return PTR_ERR(comedi_class);
2589 }
2590
e56341ad 2591 comedi_class->dev_groups = comedi_dev_groups;
91fa0b0c
HS		 2592
2593 /* XXX requires /proc interface */
2594 comedi_proc_init();
2595
2596 /* create devices files for legacy/manual use */
2597 for (i = 0; i < comedi_num_legacy_minors; i++) {
7638ffcb 2598 struct comedi_device *dev;
4bac39f6 2599
7638ffcb
IA		 2600 dev = comedi_alloc_board_minor(NULL);
2601 if (IS_ERR(dev)) {
682b9119 2602 comedi_cleanup_board_minors();
91fa0b0c
HS		 2603 cdev_del(&comedi_cdev);
2604 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2605 COMEDI_NUM_MINORS);
7638ffcb 2606 return PTR_ERR(dev);
91fa0b0c 2607 }
cb3aadae
KH		 2608 /* comedi_alloc_board_minor() locked the mutex */
2609 mutex_unlock(&dev->mutex);
91fa0b0c
HS		 2610 }
2611
2612 return 0;
2613}
2614module_init(comedi_init);
2615
2616static void __exit comedi_cleanup(void)
2617{
2618 int i;
2619
682b9119 2620 comedi_cleanup_board_minors();
5b7dba1b
IA		 2621 for (i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i)
2622 BUG_ON(comedi_board_minor_table[i]);
2623 for (i = 0; i < COMEDI_NUM_SUBDEVICE_MINORS; ++i)
2624 BUG_ON(comedi_subdevice_minor_table[i]);
91fa0b0c
HS		 2625
2626 class_destroy(comedi_class);
2627 cdev_del(&comedi_cdev);
2628 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS);
2629
2630 comedi_proc_cleanup();
2631}
2632module_exit(comedi_cleanup);
2633
a5787824
HS		 2634MODULE_AUTHOR("http://www.comedi.org");
2635MODULE_DESCRIPTION("Comedi core module");
2636MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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