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staging: comedi: sparse warning in insn_rw_emulate_bits()
[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.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21
22*/
23
24#undef DEBUG
25
26#define __NO_VERSION__
ed9eccbe
DS		 27#include "comedi_compat32.h"
28
29#include <linux/module.h>
30#include <linux/errno.h>
31#include <linux/kernel.h>
32#include <linux/sched.h>
33#include <linux/fcntl.h>
34#include <linux/delay.h>
35#include <linux/ioport.h>
36#include <linux/mm.h>
37#include <linux/slab.h>
38#include <linux/kmod.h>
39#include <linux/poll.h>
40#include <linux/init.h>
41#include <linux/device.h>
42#include <linux/vmalloc.h>
43#include <linux/fs.h>
44#include "comedidev.h"
45#include <linux/cdev.h>
883db3d9 46#include <linux/stat.h>
ed9eccbe 47
476b8477
GKH		 48#include <linux/io.h>
49#include <linux/uaccess.h>
ed9eccbe 50
3a5fa275 51#include "comedi_internal.h"
ed9eccbe
DS		 52
53MODULE_AUTHOR("http://www.comedi.org");
54MODULE_DESCRIPTION("Comedi core module");
55MODULE_LICENSE("GPL");
56
57#ifdef CONFIG_COMEDI_DEBUG
58int comedi_debug;
18736438 59EXPORT_SYMBOL(comedi_debug);
4d7df821
IA		 60module_param(comedi_debug, int, S_IRUGO | S_IWUSR);
61MODULE_PARM_DESC(comedi_debug,
62 "enable comedi core and driver debugging if non-zero (default 0)"
63 );
ed9eccbe
DS		 64#endif
65
90ab5ee9 66bool comedi_autoconfig = 1;
4d7df821
IA		 67module_param(comedi_autoconfig, bool, S_IRUGO);
68MODULE_PARM_DESC(comedi_autoconfig,
69 "enable drivers to auto-configure comedi devices (default 1)");
6a9d7a21 70
92d0127c 71static int comedi_num_legacy_minors;
4d7df821
IA		 72module_param(comedi_num_legacy_minors, int, S_IRUGO);
73MODULE_PARM_DESC(comedi_num_legacy_minors,
74 "number of comedi minor devices to reserve for non-auto-configured devices (default 0)"
75 );
76
234bb3c6 77unsigned int comedi_default_buf_size_kb = CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB;
4d7df821
IA		 78module_param(comedi_default_buf_size_kb, uint, S_IRUGO | S_IWUSR);
79MODULE_PARM_DESC(comedi_default_buf_size_kb,
80 "default asynchronous buffer size in KiB (default "
234bb3c6 81 __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB) ")");
4d7df821 82
234bb3c6
IA		 83unsigned int comedi_default_buf_maxsize_kb
84 = CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB;
4d7df821
IA		 85module_param(comedi_default_buf_maxsize_kb, uint, S_IRUGO | S_IWUSR);
86MODULE_PARM_DESC(comedi_default_buf_maxsize_kb,
87 "default maximum size of asynchronous buffer in KiB (default "
234bb3c6 88 __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB) ")");
1dd33ab8 89
ed9eccbe 90static DEFINE_SPINLOCK(comedi_file_info_table_lock);
476b8477 91static struct comedi_device_file_info
0a85b6f0 92*comedi_file_info_table[COMEDI_NUM_MINORS];
476b8477 93
f5283a4b 94static void do_become_nonbusy(struct comedi_device *dev,
0a85b6f0 95 struct comedi_subdevice *s);
34c43922 96static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s);
ed9eccbe
DS		 97
98static int comedi_fasync(int fd, struct file *file, int on);
99
71b5f4f1 100static int is_device_busy(struct comedi_device *dev);
a5011a26 101
883db3d9
FMH		 102static int resize_async_buffer(struct comedi_device *dev,
103 struct comedi_subdevice *s,
a5011a26
HS		 104 struct comedi_async *async, unsigned new_size)
105{
106 int retval;
107
108 if (new_size > async->max_bufsize)
109 return -EPERM;
110
111 if (s->busy) {
112 DPRINTK("subdevice is busy, cannot resize buffer\n");
113 return -EBUSY;
114 }
115 if (async->mmap_count) {
116 DPRINTK("subdevice is mmapped, cannot resize buffer\n");
117 return -EBUSY;
118 }
119
120 if (!async->prealloc_buf)
121 return -EINVAL;
122
123 /* make sure buffer is an integral number of pages
124 * (we round up) */
125 new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK;
126
127 retval = comedi_buf_alloc(dev, s, new_size);
128 if (retval < 0)
129 return retval;
130
131 if (s->buf_change) {
132 retval = s->buf_change(dev, s, new_size);
133 if (retval < 0)
134 return retval;
135 }
136
137 DPRINTK("comedi%i subd %d buffer resized to %i bytes\n",
138 dev->minor, (int)(s - dev->subdevices), async->prealloc_bufsz);
139 return 0;
140}
141
142/* sysfs attribute files */
143
a5011a26
HS		 144static ssize_t show_max_read_buffer_kb(struct device *dev,
145 struct device_attribute *attr, char *buf)
146{
a5011a26 147 struct comedi_device_file_info *info = dev_get_drvdata(dev);
72fd9fac
HS		 148 struct comedi_subdevice *s = comedi_get_read_subdevice(info);
149 unsigned int size = 0;
a5011a26
HS		 150
151 mutex_lock(&info->device->mutex);
72fd9fac
HS		 152 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
153 size = s->async->max_bufsize / 1024;
a5011a26
HS		 154 mutex_unlock(&info->device->mutex);
155
72fd9fac 156 return snprintf(buf, PAGE_SIZE, "%i\n", size);
a5011a26
HS		 157}
158
159static ssize_t store_max_read_buffer_kb(struct device *dev,
160 struct device_attribute *attr,
161 const char *buf, size_t count)
162{
163 struct comedi_device_file_info *info = dev_get_drvdata(dev);
72fd9fac
HS		 164 struct comedi_subdevice *s = comedi_get_read_subdevice(info);
165 unsigned int size;
166 int err;
167
168 err = kstrtouint(buf, 10, &size);
169 if (err)
170 return err;
171 if (size > (UINT_MAX / 1024))
a5011a26 172 return -EINVAL;
72fd9fac 173 size *= 1024;
a5011a26
HS		 174
175 mutex_lock(&info->device->mutex);
72fd9fac
HS		 176 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
177 s->async->max_bufsize = size;
178 else
179 err = -EINVAL;
a5011a26
HS		 180 mutex_unlock(&info->device->mutex);
181
72fd9fac 182 return err ? err : count;
a5011a26
HS		 183}
184
a5011a26
HS		 185static ssize_t show_read_buffer_kb(struct device *dev,
186 struct device_attribute *attr, char *buf)
187{
a5011a26 188 struct comedi_device_file_info *info = dev_get_drvdata(dev);
72fd9fac
HS		 189 struct comedi_subdevice *s = comedi_get_read_subdevice(info);
190 unsigned int size = 0;
a5011a26
HS		 191
192 mutex_lock(&info->device->mutex);
72fd9fac
HS		 193 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
194 size = s->async->prealloc_bufsz / 1024;
a5011a26
HS		 195 mutex_unlock(&info->device->mutex);
196
72fd9fac 197 return snprintf(buf, PAGE_SIZE, "%i\n", size);
a5011a26
HS		 198}
199
200static ssize_t store_read_buffer_kb(struct device *dev,
201 struct device_attribute *attr,
202 const char *buf, size_t count)
203{
204 struct comedi_device_file_info *info = dev_get_drvdata(dev);
72fd9fac
HS		 205 struct comedi_subdevice *s = comedi_get_read_subdevice(info);
206 unsigned int size;
207 int err;
208
209 err = kstrtouint(buf, 10, &size);
210 if (err)
211 return err;
212 if (size > (UINT_MAX / 1024))
a5011a26 213 return -EINVAL;
72fd9fac 214 size *= 1024;
a5011a26
HS		 215
216 mutex_lock(&info->device->mutex);
72fd9fac
HS		 217 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
218 err = resize_async_buffer(info->device, s, s->async, size);
219 else
220 err = -EINVAL;
a5011a26
HS		 221 mutex_unlock(&info->device->mutex);
222
72fd9fac 223 return err ? err : count;
a5011a26 224}
883db3d9 225
a5011a26
HS		 226static ssize_t show_max_write_buffer_kb(struct device *dev,
227 struct device_attribute *attr,
228 char *buf)
229{
a5011a26 230 struct comedi_device_file_info *info = dev_get_drvdata(dev);
72fd9fac
HS		 231 struct comedi_subdevice *s = comedi_get_write_subdevice(info);
232 unsigned int size = 0;
a5011a26
HS		 233
234 mutex_lock(&info->device->mutex);
72fd9fac
HS		 235 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
236 size = s->async->max_bufsize / 1024;
a5011a26
HS		 237 mutex_unlock(&info->device->mutex);
238
72fd9fac 239 return snprintf(buf, PAGE_SIZE, "%i\n", size);
a5011a26
HS		 240}
241
242static ssize_t store_max_write_buffer_kb(struct device *dev,
243 struct device_attribute *attr,
244 const char *buf, size_t count)
245{
246 struct comedi_device_file_info *info = dev_get_drvdata(dev);
72fd9fac
HS		 247 struct comedi_subdevice *s = comedi_get_write_subdevice(info);
248 unsigned int size;
249 int err;
250
251 err = kstrtouint(buf, 10, &size);
252 if (err)
253 return err;
254 if (size > (UINT_MAX / 1024))
a5011a26 255 return -EINVAL;
72fd9fac 256 size *= 1024;
a5011a26
HS		 257
258 mutex_lock(&info->device->mutex);
72fd9fac
HS		 259 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
260 s->async->max_bufsize = size;
261 else
262 err = -EINVAL;
a5011a26
HS		 263 mutex_unlock(&info->device->mutex);
264
72fd9fac 265 return err ? err : count;
a5011a26
HS		 266}
267
a5011a26
HS		 268static ssize_t show_write_buffer_kb(struct device *dev,
269 struct device_attribute *attr, char *buf)
270{
a5011a26 271 struct comedi_device_file_info *info = dev_get_drvdata(dev);
72fd9fac
HS		 272 struct comedi_subdevice *s = comedi_get_write_subdevice(info);
273 unsigned int size = 0;
a5011a26
HS		 274
275 mutex_lock(&info->device->mutex);
72fd9fac
HS		 276 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
277 size = s->async->prealloc_bufsz / 1024;
a5011a26
HS		 278 mutex_unlock(&info->device->mutex);
279
72fd9fac 280 return snprintf(buf, PAGE_SIZE, "%i\n", size);
a5011a26
HS		 281}
282
283static ssize_t store_write_buffer_kb(struct device *dev,
284 struct device_attribute *attr,
285 const char *buf, size_t count)
286{
287 struct comedi_device_file_info *info = dev_get_drvdata(dev);
72fd9fac
HS		 288 struct comedi_subdevice *s = comedi_get_write_subdevice(info);
289 unsigned int size;
290 int err;
291
292 err = kstrtouint(buf, 10, &size);
293 if (err)
294 return err;
295 if (size > (UINT_MAX / 1024))
a5011a26 296 return -EINVAL;
72fd9fac 297 size *= 1024;
a5011a26
HS		 298
299 mutex_lock(&info->device->mutex);
72fd9fac
HS		 300 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
301 err = resize_async_buffer(info->device, s, s->async, size);
302 else
303 err = -EINVAL;
a5011a26
HS		 304 mutex_unlock(&info->device->mutex);
305
72fd9fac 306 return err ? err : count;
a5011a26
HS		 307}
308
fb60367d
HS		 309static struct device_attribute comedi_dev_attrs[] = {
310 __ATTR(max_read_buffer_kb, S_IRUGO | S_IWUSR,
311 show_max_read_buffer_kb, store_max_read_buffer_kb),
312 __ATTR(read_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP,
313 show_read_buffer_kb, store_read_buffer_kb),
314 __ATTR(max_write_buffer_kb, S_IRUGO | S_IWUSR,
315 show_max_write_buffer_kb, store_max_write_buffer_kb),
316 __ATTR(write_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP,
317 show_write_buffer_kb, store_write_buffer_kb),
318 __ATTR_NULL
a5011a26 319};
ed9eccbe 320
ed9eccbe
DS		 321/*
322 COMEDI_DEVCONFIG
323 device config ioctl
324
325 arg:
326 pointer to devconfig structure
327
328 reads:
329 devconfig structure at arg
330
331 writes:
332 none
333*/
0a85b6f0 334static int do_devconfig_ioctl(struct comedi_device *dev,
92d0127c 335 struct comedi_devconfig __user *arg)
ed9eccbe 336{
0707bb04 337 struct comedi_devconfig it;
ed9eccbe
DS		 338 int ret;
339 unsigned char *aux_data = NULL;
340 int aux_len;
341
342 if (!capable(CAP_SYS_ADMIN))
343 return -EPERM;
344
345 if (arg == NULL) {
346 if (is_device_busy(dev))
347 return -EBUSY;
476b8477 348 if (dev->attached) {
ed9eccbe
DS		 349 struct module *driver_module = dev->driver->module;
350 comedi_device_detach(dev);
351 module_put(driver_module);
352 }
353 return 0;
354 }
355
0707bb04 356 if (copy_from_user(&it, arg, sizeof(struct comedi_devconfig)))
ed9eccbe
DS		 357 return -EFAULT;
358
359 it.board_name[COMEDI_NAMELEN - 1] = 0;
360
361 if (comedi_aux_data(it.options, 0) &&
476b8477 362 it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) {
ed9eccbe
DS		 363 int bit_shift;
364 aux_len = it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH];
365 if (aux_len < 0)
366 return -EFAULT;
367
368 aux_data = vmalloc(aux_len);
369 if (!aux_data)
370 return -ENOMEM;
371
372 if (copy_from_user(aux_data,
dc881f29
IA		 373 (unsigned char __user *
374 )comedi_aux_data(it.options, 0), aux_len)) {
ed9eccbe
DS		 375 vfree(aux_data);
376 return -EFAULT;
377 }
378 it.options[COMEDI_DEVCONF_AUX_DATA_LO] =
476b8477 379 (unsigned long)aux_data;
ed9eccbe
DS		 380 if (sizeof(void *) > sizeof(int)) {
381 bit_shift = sizeof(int) * 8;
382 it.options[COMEDI_DEVCONF_AUX_DATA_HI] =
476b8477 383 ((unsigned long)aux_data) >> bit_shift;
ed9eccbe
DS		 384 } else
385 it.options[COMEDI_DEVCONF_AUX_DATA_HI] = 0;
386 }
387
388 ret = comedi_device_attach(dev, &it);
476b8477
GKH		 389 if (ret == 0) {
390 if (!try_module_get(dev->driver->module)) {
ed9eccbe 391 comedi_device_detach(dev);
abae41e6 392 ret = -ENOSYS;
ed9eccbe
DS		 393 }
394 }
395
396 if (aux_data)
397 vfree(aux_data);
398
399 return ret;
400}
401
402/*
403 COMEDI_BUFCONFIG
404 buffer configuration ioctl
405
406 arg:
407 pointer to bufconfig structure
408
409 reads:
410 bufconfig at arg
411
412 writes:
413 modified bufconfig at arg
414
415*/
92d0127c
GKH		 416static int do_bufconfig_ioctl(struct comedi_device *dev,
417 struct comedi_bufconfig __user *arg)
ed9eccbe 418{
be6aba4a 419 struct comedi_bufconfig bc;
d163679c 420 struct comedi_async *async;
34c43922 421 struct comedi_subdevice *s;
883db3d9 422 int retval = 0;
ed9eccbe 423
be6aba4a 424 if (copy_from_user(&bc, arg, sizeof(struct comedi_bufconfig)))
ed9eccbe
DS		 425 return -EFAULT;
426
427 if (bc.subdevice >= dev->n_subdevices || bc.subdevice < 0)
428 return -EINVAL;
429
b077f2cd 430 s = &dev->subdevices[bc.subdevice];
ed9eccbe
DS		 431 async = s->async;
432
433 if (!async) {
434 DPRINTK("subdevice does not have async capability\n");
435 bc.size = 0;
436 bc.maximum_size = 0;
437 goto copyback;
438 }
439
440 if (bc.maximum_size) {
441 if (!capable(CAP_SYS_ADMIN))
442 return -EPERM;
443
444 async->max_bufsize = bc.maximum_size;
445 }
446
447 if (bc.size) {
883db3d9
FMH		 448 retval = resize_async_buffer(dev, s, async, bc.size);
449 if (retval < 0)
450 return retval;
ed9eccbe
DS		 451 }
452
453 bc.size = async->prealloc_bufsz;
454 bc.maximum_size = async->max_bufsize;
455
476b8477 456copyback:
be6aba4a 457 if (copy_to_user(arg, &bc, sizeof(struct comedi_bufconfig)))
ed9eccbe
DS		 458 return -EFAULT;
459
460 return 0;
461}
462
463/*
464 COMEDI_DEVINFO
465 device info ioctl
466
467 arg:
468 pointer to devinfo structure
469
470 reads:
471 none
472
473 writes:
474 devinfo structure
475
476*/
0a85b6f0 477static int do_devinfo_ioctl(struct comedi_device *dev,
92d0127c
GKH		 478 struct comedi_devinfo __user *arg,
479 struct file *file)
ed9eccbe 480{
063db04b 481 struct comedi_devinfo devinfo;
ed9eccbe 482 const unsigned minor = iminor(file->f_dentry->d_inode);
476b8477
GKH		 483 struct comedi_device_file_info *dev_file_info =
484 comedi_get_device_file_info(minor);
34c43922 485 struct comedi_subdevice *read_subdev =
476b8477 486 comedi_get_read_subdevice(dev_file_info);
34c43922 487 struct comedi_subdevice *write_subdev =
476b8477 488 comedi_get_write_subdevice(dev_file_info);
ed9eccbe
DS		 489
490 memset(&devinfo, 0, sizeof(devinfo));
491
492 /* fill devinfo structure */
493 devinfo.version_code = COMEDI_VERSION_CODE;
494 devinfo.n_subdevs = dev->n_subdevices;
819cbb12
VK		 495 strlcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN);
496 strlcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN);
ed9eccbe 497
476b8477 498 if (read_subdev)
ed9eccbe 499 devinfo.read_subdevice = read_subdev - dev->subdevices;
476b8477 500 else
ed9eccbe 501 devinfo.read_subdevice = -1;
476b8477
GKH		 502
503 if (write_subdev)
ed9eccbe 504 devinfo.write_subdevice = write_subdev - dev->subdevices;
476b8477 505 else
ed9eccbe 506 devinfo.write_subdevice = -1;
ed9eccbe 507
063db04b 508 if (copy_to_user(arg, &devinfo, sizeof(struct comedi_devinfo)))
ed9eccbe
DS		 509 return -EFAULT;
510
511 return 0;
512}
513
514/*
515 COMEDI_SUBDINFO
516 subdevice info ioctl
517
518 arg:
519 pointer to array of subdevice info structures
520
521 reads:
522 none
523
524 writes:
525 array of subdevice info structures at arg
526
527*/
0a85b6f0 528static int do_subdinfo_ioctl(struct comedi_device *dev,
92d0127c 529 struct comedi_subdinfo __user *arg, void *file)
ed9eccbe
DS		 530{
531 int ret, i;
bd52efbb 532 struct comedi_subdinfo *tmp, *us;
34c43922 533 struct comedi_subdevice *s;
ed9eccbe 534
0a85b6f0
MT		 535 tmp =
536 kcalloc(dev->n_subdevices, sizeof(struct comedi_subdinfo),
537 GFP_KERNEL);
ed9eccbe
DS		 538 if (!tmp)
539 return -ENOMEM;
540
541 /* fill subdinfo structs */
542 for (i = 0; i < dev->n_subdevices; i++) {
b077f2cd 543 s = &dev->subdevices[i];
ed9eccbe
DS		 544 us = tmp + i;
545
546 us->type = s->type;
547 us->n_chan = s->n_chan;
548 us->subd_flags = s->subdev_flags;
549 if (comedi_get_subdevice_runflags(s) & SRF_RUNNING)
550 us->subd_flags |= SDF_RUNNING;
551#define TIMER_nanosec 5 /* backwards compatibility */
552 us->timer_type = TIMER_nanosec;
553 us->len_chanlist = s->len_chanlist;
554 us->maxdata = s->maxdata;
555 if (s->range_table) {
556 us->range_type =
476b8477 557 (i << 24) | (0 << 16) | (s->range_table->length);
ed9eccbe
DS		 558 } else {
559 us->range_type = 0; /* XXX */
560 }
561 us->flags = s->flags;
562
563 if (s->busy)
564 us->subd_flags |= SDF_BUSY;
565 if (s->busy == file)
566 us->subd_flags |= SDF_BUSY_OWNER;
567 if (s->lock)
568 us->subd_flags |= SDF_LOCKED;
569 if (s->lock == file)
570 us->subd_flags |= SDF_LOCK_OWNER;
571 if (!s->maxdata && s->maxdata_list)
572 us->subd_flags |= SDF_MAXDATA;
573 if (s->flaglist)
574 us->subd_flags |= SDF_FLAGS;
575 if (s->range_table_list)
576 us->subd_flags |= SDF_RANGETYPE;
577 if (s->do_cmd)
578 us->subd_flags |= SDF_CMD;
579
580 if (s->insn_bits != &insn_inval)
581 us->insn_bits_support = COMEDI_SUPPORTED;
582 else
583 us->insn_bits_support = COMEDI_UNSUPPORTED;
584
585 us->settling_time_0 = s->settling_time_0;
586 }
587
588 ret = copy_to_user(arg, tmp,
bd52efbb 589 dev->n_subdevices * sizeof(struct comedi_subdinfo));
ed9eccbe
DS		 590
591 kfree(tmp);
592
593 return ret ? -EFAULT : 0;
594}
595
596/*
597 COMEDI_CHANINFO
598 subdevice info ioctl
599
600 arg:
601 pointer to chaninfo structure
602
603 reads:
604 chaninfo structure at arg
605
606 writes:
607 arrays at elements of chaninfo structure
608
609*/
0a85b6f0 610static int do_chaninfo_ioctl(struct comedi_device *dev,
92d0127c 611 struct comedi_chaninfo __user *arg)
ed9eccbe 612{
34c43922 613 struct comedi_subdevice *s;
a18b416d 614 struct comedi_chaninfo it;
ed9eccbe 615
a18b416d 616 if (copy_from_user(&it, arg, sizeof(struct comedi_chaninfo)))
ed9eccbe
DS		 617 return -EFAULT;
618
619 if (it.subdev >= dev->n_subdevices)
620 return -EINVAL;
b077f2cd 621 s = &dev->subdevices[it.subdev];
ed9eccbe
DS		 622
623 if (it.maxdata_list) {
624 if (s->maxdata || !s->maxdata_list)
625 return -EINVAL;
626 if (copy_to_user(it.maxdata_list, s->maxdata_list,
790c5541 627 s->n_chan * sizeof(unsigned int)))
ed9eccbe
DS		 628 return -EFAULT;
629 }
630
631 if (it.flaglist) {
632 if (!s->flaglist)
633 return -EINVAL;
634 if (copy_to_user(it.flaglist, s->flaglist,
476b8477 635 s->n_chan * sizeof(unsigned int)))
ed9eccbe
DS		 636 return -EFAULT;
637 }
638
639 if (it.rangelist) {
640 int i;
641
642 if (!s->range_table_list)
643 return -EINVAL;
644 for (i = 0; i < s->n_chan; i++) {
645 int x;
646
647 x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) |
476b8477 648 (s->range_table_list[i]->length);
81604d43
VK		 649 if (put_user(x, it.rangelist + i))
650 return -EFAULT;
ed9eccbe 651 }
476b8477
GKH		 652#if 0
653 if (copy_to_user(it.rangelist, s->range_type_list,
0a85b6f0 654 s->n_chan * sizeof(unsigned int)))
476b8477
GKH		 655 return -EFAULT;
656#endif
ed9eccbe
DS		 657 }
658
659 return 0;
660}
661
662 /*
663 COMEDI_BUFINFO
664 buffer information ioctl
665
666 arg:
667 pointer to bufinfo structure
668
669 reads:
670 bufinfo at arg
671
672 writes:
673 modified bufinfo at arg
674
675 */
92d0127c 676static int do_bufinfo_ioctl(struct comedi_device *dev,
53fa827e 677 struct comedi_bufinfo __user *arg, void *file)
ed9eccbe 678{
9aa5339a 679 struct comedi_bufinfo bi;
34c43922 680 struct comedi_subdevice *s;
d163679c 681 struct comedi_async *async;
ed9eccbe 682
9aa5339a 683 if (copy_from_user(&bi, arg, sizeof(struct comedi_bufinfo)))
ed9eccbe
DS		 684 return -EFAULT;
685
686 if (bi.subdevice >= dev->n_subdevices || bi.subdevice < 0)
687 return -EINVAL;
688
b077f2cd 689 s = &dev->subdevices[bi.subdevice];
53fa827e
IA		 690
691 if (s->lock && s->lock != file)
692 return -EACCES;
693
ed9eccbe
DS		 694 async = s->async;
695
696 if (!async) {
697 DPRINTK("subdevice does not have async capability\n");
698 bi.buf_write_ptr = 0;
699 bi.buf_read_ptr = 0;
700 bi.buf_write_count = 0;
701 bi.buf_read_count = 0;
4772c018
IA		 702 bi.bytes_read = 0;
703 bi.bytes_written = 0;
ed9eccbe
DS		 704 goto copyback;
705 }
53fa827e
IA		 706 if (!s->busy) {
707 bi.bytes_read = 0;
708 bi.bytes_written = 0;
709 goto copyback_position;
710 }
711 if (s->busy != file)
712 return -EACCES;
ed9eccbe
DS		 713
714 if (bi.bytes_read && (s->subdev_flags & SDF_CMD_READ)) {
715 bi.bytes_read = comedi_buf_read_alloc(async, bi.bytes_read);
716 comedi_buf_read_free(async, bi.bytes_read);
717
718 if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR |
476b8477
GKH		 719 SRF_RUNNING))
720 && async->buf_write_count == async->buf_read_count) {
ed9eccbe
DS		 721 do_become_nonbusy(dev, s);
722 }
723 }
724
725 if (bi.bytes_written && (s->subdev_flags & SDF_CMD_WRITE)) {
726 bi.bytes_written =
476b8477 727 comedi_buf_write_alloc(async, bi.bytes_written);
ed9eccbe
DS		 728 comedi_buf_write_free(async, bi.bytes_written);
729 }
730
53fa827e 731copyback_position:
ed9eccbe
DS		 732 bi.buf_write_count = async->buf_write_count;
733 bi.buf_write_ptr = async->buf_write_ptr;
734 bi.buf_read_count = async->buf_read_count;
735 bi.buf_read_ptr = async->buf_read_ptr;
736
476b8477 737copyback:
9aa5339a 738 if (copy_to_user(arg, &bi, sizeof(struct comedi_bufinfo)))
ed9eccbe
DS		 739 return -EFAULT;
740
741 return 0;
742}
743
0a85b6f0
MT		 744static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn,
745 unsigned int *data, void *file);
ed9eccbe 746/*
20617f22
PDP		 747 * COMEDI_INSNLIST
748 * synchronous instructions
ed9eccbe 749 *
20617f22
PDP		 750 * arg:
751 * pointer to sync cmd structure
ed9eccbe 752 *
20617f22
PDP		 753 * reads:
754 * sync cmd struct at arg
755 * instruction list
756 * data (for writes)
ed9eccbe 757 *
20617f22
PDP		 758 * writes:
759 * data (for reads)
ed9eccbe
DS		 760 */
761/* arbitrary limits */
762#define MAX_SAMPLES 256
92d0127c
GKH		 763static int do_insnlist_ioctl(struct comedi_device *dev,
764 struct comedi_insnlist __user *arg, void *file)
ed9eccbe 765{
da613f4f 766 struct comedi_insnlist insnlist;
90035c08 767 struct comedi_insn *insns = NULL;
790c5541 768 unsigned int *data = NULL;
ed9eccbe
DS		 769 int i = 0;
770 int ret = 0;
771
da613f4f 772 if (copy_from_user(&insnlist, arg, sizeof(struct comedi_insnlist)))
ed9eccbe
DS		 773 return -EFAULT;
774
790c5541 775 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL);
ed9eccbe
DS		 776 if (!data) {
777 DPRINTK("kmalloc failed\n");
778 ret = -ENOMEM;
779 goto error;
780 }
781
0a85b6f0 782 insns =
dfd8ee92 783 kcalloc(insnlist.n_insns, sizeof(struct comedi_insn), GFP_KERNEL);
ed9eccbe
DS		 784 if (!insns) {
785 DPRINTK("kmalloc failed\n");
786 ret = -ENOMEM;
787 goto error;
788 }
789
790 if (copy_from_user(insns, insnlist.insns,
90035c08 791 sizeof(struct comedi_insn) * insnlist.n_insns)) {
ed9eccbe
DS		 792 DPRINTK("copy_from_user failed\n");
793 ret = -EFAULT;
794 goto error;
795 }
796
797 for (i = 0; i < insnlist.n_insns; i++) {
798 if (insns[i].n > MAX_SAMPLES) {
799 DPRINTK("number of samples too large\n");
800 ret = -EINVAL;
801 goto error;
802 }
803 if (insns[i].insn & INSN_MASK_WRITE) {
804 if (copy_from_user(data, insns[i].data,
790c5541 805 insns[i].n * sizeof(unsigned int))) {
ed9eccbe
DS		 806 DPRINTK("copy_from_user failed\n");
807 ret = -EFAULT;
808 goto error;
809 }
810 }
811 ret = parse_insn(dev, insns + i, data, file);
812 if (ret < 0)
813 goto error;
814 if (insns[i].insn & INSN_MASK_READ) {
815 if (copy_to_user(insns[i].data, data,
790c5541 816 insns[i].n * sizeof(unsigned int))) {
ed9eccbe
DS		 817 DPRINTK("copy_to_user failed\n");
818 ret = -EFAULT;
819 goto error;
820 }
821 }
822 if (need_resched())
823 schedule();
824 }
825
476b8477
GKH		 826error:
827 kfree(insns);
828 kfree(data);
ed9eccbe
DS		 829
830 if (ret < 0)
831 return ret;
832 return i;
833}
834
0a85b6f0
MT		 835static int check_insn_config_length(struct comedi_insn *insn,
836 unsigned int *data)
ed9eccbe 837{
476b8477
GKH		 838 if (insn->n < 1)
839 return -EINVAL;
ed9eccbe
DS		 840
841 switch (data[0]) {
842 case INSN_CONFIG_DIO_OUTPUT:
843 case INSN_CONFIG_DIO_INPUT:
844 case INSN_CONFIG_DISARM:
845 case INSN_CONFIG_RESET:
846 if (insn->n == 1)
847 return 0;
848 break;
849 case INSN_CONFIG_ARM:
850 case INSN_CONFIG_DIO_QUERY:
851 case INSN_CONFIG_BLOCK_SIZE:
852 case INSN_CONFIG_FILTER:
853 case INSN_CONFIG_SERIAL_CLOCK:
854 case INSN_CONFIG_BIDIRECTIONAL_DATA:
855 case INSN_CONFIG_ALT_SOURCE:
856 case INSN_CONFIG_SET_COUNTER_MODE:
857 case INSN_CONFIG_8254_READ_STATUS:
858 case INSN_CONFIG_SET_ROUTING:
859 case INSN_CONFIG_GET_ROUTING:
860 case INSN_CONFIG_GET_PWM_STATUS:
861 case INSN_CONFIG_PWM_SET_PERIOD:
862 case INSN_CONFIG_PWM_GET_PERIOD:
863 if (insn->n == 2)
864 return 0;
865 break;
866 case INSN_CONFIG_SET_GATE_SRC:
867 case INSN_CONFIG_GET_GATE_SRC:
868 case INSN_CONFIG_SET_CLOCK_SRC:
869 case INSN_CONFIG_GET_CLOCK_SRC:
870 case INSN_CONFIG_SET_OTHER_SRC:
871 case INSN_CONFIG_GET_COUNTER_STATUS:
872 case INSN_CONFIG_PWM_SET_H_BRIDGE:
873 case INSN_CONFIG_PWM_GET_H_BRIDGE:
874 case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE:
875 if (insn->n == 3)
876 return 0;
877 break;
878 case INSN_CONFIG_PWM_OUTPUT:
879 case INSN_CONFIG_ANALOG_TRIG:
880 if (insn->n == 5)
881 return 0;
882 break;
0a85b6f0
MT		 883 /* by default we allow the insn since we don't have checks for
884 * all possible cases yet */
ed9eccbe 885 default:
4f870fe6
IA		 886 pr_warn("comedi: No check for data length of config insn id %i is implemented.\n",
887 data[0]);
888 pr_warn("comedi: Add a check to %s in %s.\n",
889 __func__, __FILE__);
890 pr_warn("comedi: Assuming n=%i is correct.\n", insn->n);
ed9eccbe 891 return 0;
ed9eccbe
DS		 892 }
893 return -EINVAL;
894}
895
0a85b6f0
MT		 896static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn,
897 unsigned int *data, void *file)
ed9eccbe 898{
34c43922 899 struct comedi_subdevice *s;
ed9eccbe
DS		 900 int ret = 0;
901 int i;
902
903 if (insn->insn & INSN_MASK_SPECIAL) {
904 /* a non-subdevice instruction */
905
906 switch (insn->insn) {
907 case INSN_GTOD:
908 {
909 struct timeval tv;
910
911 if (insn->n != 2) {
912 ret = -EINVAL;
913 break;
914 }
915
916 do_gettimeofday(&tv);
917 data[0] = tv.tv_sec;
918 data[1] = tv.tv_usec;
919 ret = 2;
920
921 break;
922 }
923 case INSN_WAIT:
924 if (insn->n != 1 || data[0] >= 100000) {
925 ret = -EINVAL;
926 break;
927 }
928 udelay(data[0] / 1000);
929 ret = 1;
930 break;
931 case INSN_INTTRIG:
932 if (insn->n != 1) {
933 ret = -EINVAL;
934 break;
935 }
936 if (insn->subdev >= dev->n_subdevices) {
937 DPRINTK("%d not usable subdevice\n",
938 insn->subdev);
939 ret = -EINVAL;
940 break;
941 }
b077f2cd 942 s = &dev->subdevices[insn->subdev];
ed9eccbe
DS		 943 if (!s->async) {
944 DPRINTK("no async\n");
945 ret = -EINVAL;
946 break;
947 }
948 if (!s->async->inttrig) {
949 DPRINTK("no inttrig\n");
950 ret = -EAGAIN;
951 break;
952 }
953 ret = s->async->inttrig(dev, s, insn->data[0]);
954 if (ret >= 0)
955 ret = 1;
956 break;
957 default:
958 DPRINTK("invalid insn\n");
959 ret = -EINVAL;
960 break;
961 }
962 } else {
963 /* a subdevice instruction */
790c5541 964 unsigned int maxdata;
ed9eccbe
DS		 965
966 if (insn->subdev >= dev->n_subdevices) {
967 DPRINTK("subdevice %d out of range\n", insn->subdev);
968 ret = -EINVAL;
969 goto out;
970 }
b077f2cd 971 s = &dev->subdevices[insn->subdev];
ed9eccbe
DS		 972
973 if (s->type == COMEDI_SUBD_UNUSED) {
974 DPRINTK("%d not usable subdevice\n", insn->subdev);
975 ret = -EIO;
976 goto out;
977 }
978
979 /* are we locked? (ioctl lock) */
980 if (s->lock && s->lock != file) {
981 DPRINTK("device locked\n");
982 ret = -EACCES;
983 goto out;
984 }
985
0fd0ca75 986 ret = comedi_check_chanlist(s, 1, &insn->chanspec);
476b8477 987 if (ret < 0) {
ed9eccbe
DS		 988 ret = -EINVAL;
989 DPRINTK("bad chanspec\n");
990 goto out;
991 }
992
993 if (s->busy) {
994 ret = -EBUSY;
995 goto out;
996 }
997 /* This looks arbitrary. It is. */
998 s->busy = &parse_insn;
999 switch (insn->insn) {
1000 case INSN_READ:
1001 ret = s->insn_read(dev, s, insn, data);
1002 break;
1003 case INSN_WRITE:
1004 maxdata = s->maxdata_list
476b8477
GKH		 1005 ? s->maxdata_list[CR_CHAN(insn->chanspec)]
1006 : s->maxdata;
ed9eccbe
DS		 1007 for (i = 0; i < insn->n; ++i) {
1008 if (data[i] > maxdata) {
1009 ret = -EINVAL;
1010 DPRINTK("bad data value(s)\n");
1011 break;
1012 }
1013 }
1014 if (ret == 0)
1015 ret = s->insn_write(dev, s, insn, data);
1016 break;
1017 case INSN_BITS:
1018 if (insn->n != 2) {
1019 ret = -EINVAL;
2f644ccf
IA		 1020 } else {
1021 /* Most drivers ignore the base channel in
1022 * insn->chanspec. Fix this here if
1023 * the subdevice has <= 32 channels. */
1024 unsigned int shift;
1025 unsigned int orig_mask;
1026
1027 orig_mask = data[0];
1028 if (s->n_chan <= 32) {
1029 shift = CR_CHAN(insn->chanspec);
1030 if (shift > 0) {
1031 insn->chanspec = 0;
1032 data[0] <<= shift;
1033 data[1] <<= shift;
1034 }
1035 } else
1036 shift = 0;
1037 ret = s->insn_bits(dev, s, insn, data);
1038 data[0] = orig_mask;
1039 if (shift > 0)
1040 data[1] >>= shift;
ed9eccbe 1041 }
ed9eccbe
DS		 1042 break;
1043 case INSN_CONFIG:
1044 ret = check_insn_config_length(insn, data);
1045 if (ret)
1046 break;
1047 ret = s->insn_config(dev, s, insn, data);
1048 break;
1049 default:
1050 ret = -EINVAL;
1051 break;
1052 }
1053
1054 s->busy = NULL;
1055 }
1056
476b8477 1057out:
ed9eccbe
DS		 1058 return ret;
1059}
1060
1061/*
20617f22
PDP		 1062 * COMEDI_INSN
1063 * synchronous instructions
ed9eccbe 1064 *
20617f22
PDP		 1065 * arg:
1066 * pointer to insn
ed9eccbe 1067 *
20617f22
PDP		 1068 * reads:
1069 * struct comedi_insn struct at arg
1070 * data (for writes)
ed9eccbe 1071 *
20617f22
PDP		 1072 * writes:
1073 * data (for reads)
ed9eccbe 1074 */
92d0127c
GKH		 1075static int do_insn_ioctl(struct comedi_device *dev,
1076 struct comedi_insn __user *arg, void *file)
ed9eccbe 1077{
90035c08 1078 struct comedi_insn insn;
790c5541 1079 unsigned int *data = NULL;
ed9eccbe
DS		 1080 int ret = 0;
1081
790c5541 1082 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL);
ed9eccbe
DS		 1083 if (!data) {
1084 ret = -ENOMEM;
1085 goto error;
1086 }
1087
90035c08 1088 if (copy_from_user(&insn, arg, sizeof(struct comedi_insn))) {
ed9eccbe
DS		 1089 ret = -EFAULT;
1090 goto error;
1091 }
1092
1093 /* This is where the behavior of insn and insnlist deviate. */
1094 if (insn.n > MAX_SAMPLES)
1095 insn.n = MAX_SAMPLES;
1096 if (insn.insn & INSN_MASK_WRITE) {
21fe2eea
M		 1097 if (copy_from_user(data,
1098 insn.data,
1099 insn.n * sizeof(unsigned int))) {
ed9eccbe
DS		 1100 ret = -EFAULT;
1101 goto error;
1102 }
1103 }
1104 ret = parse_insn(dev, &insn, data, file);
1105 if (ret < 0)
1106 goto error;
1107 if (insn.insn & INSN_MASK_READ) {
21fe2eea
M		 1108 if (copy_to_user(insn.data,
1109 data,
1110 insn.n * sizeof(unsigned int))) {
ed9eccbe
DS		 1111 ret = -EFAULT;
1112 goto error;
1113 }
1114 }
1115 ret = insn.n;
1116
476b8477
GKH		 1117error:
1118 kfree(data);
ed9eccbe
DS		 1119
1120 return ret;
1121}
1122
181bd67b
GKH		 1123static void comedi_set_subdevice_runflags(struct comedi_subdevice *s,
1124 unsigned mask, unsigned bits)
1125{
1126 unsigned long flags;
1127
1128 spin_lock_irqsave(&s->spin_lock, flags);
1129 s->runflags &= ~mask;
1130 s->runflags |= (bits & mask);
1131 spin_unlock_irqrestore(&s->spin_lock, flags);
1132}
1133
92d0127c 1134static int do_cmd_ioctl(struct comedi_device *dev,
cbe01f72 1135 struct comedi_cmd __user *arg, void *file)
ed9eccbe 1136{
88bc0574 1137 struct comedi_cmd cmd;
34c43922 1138 struct comedi_subdevice *s;
d163679c 1139 struct comedi_async *async;
ed9eccbe 1140 int ret = 0;
95bc359f 1141 unsigned int __user *user_chanlist;
ed9eccbe 1142
88bc0574 1143 if (copy_from_user(&cmd, arg, sizeof(struct comedi_cmd))) {
ed9eccbe
DS		 1144 DPRINTK("bad cmd address\n");
1145 return -EFAULT;
1146 }
476b8477 1147 /* save user's chanlist pointer so it can be restored later */
95bc359f 1148 user_chanlist = (unsigned int __user *)cmd.chanlist;
ed9eccbe 1149
88bc0574
HS		 1150 if (cmd.subdev >= dev->n_subdevices) {
1151 DPRINTK("%d no such subdevice\n", cmd.subdev);
ed9eccbe
DS		 1152 return -ENODEV;
1153 }
1154
88bc0574 1155 s = &dev->subdevices[cmd.subdev];
ed9eccbe
DS		 1156 async = s->async;
1157
1158 if (s->type == COMEDI_SUBD_UNUSED) {
88bc0574 1159 DPRINTK("%d not valid subdevice\n", cmd.subdev);
ed9eccbe
DS		 1160 return -EIO;
1161 }
1162
1163 if (!s->do_cmd || !s->do_cmdtest || !s->async) {
1164 DPRINTK("subdevice %i does not support commands\n",
88bc0574 1165 cmd.subdev);
ed9eccbe
DS		 1166 return -EIO;
1167 }
1168
1169 /* are we locked? (ioctl lock) */
1170 if (s->lock && s->lock != file) {
1171 DPRINTK("subdevice locked\n");
1172 return -EACCES;
1173 }
1174
1175 /* are we busy? */
1176 if (s->busy) {
1177 DPRINTK("subdevice busy\n");
1178 return -EBUSY;
1179 }
1180 s->busy = file;
1181
1182 /* make sure channel/gain list isn't too long */
88bc0574 1183 if (cmd.chanlist_len > s->len_chanlist) {
ed9eccbe 1184 DPRINTK("channel/gain list too long %u > %d\n",
88bc0574 1185 cmd.chanlist_len, s->len_chanlist);
ed9eccbe
DS		 1186 ret = -EINVAL;
1187 goto cleanup;
1188 }
1189
1190 /* make sure channel/gain list isn't too short */
88bc0574 1191 if (cmd.chanlist_len < 1) {
ed9eccbe 1192 DPRINTK("channel/gain list too short %u < 1\n",
88bc0574 1193 cmd.chanlist_len);
ed9eccbe
DS		 1194 ret = -EINVAL;
1195 goto cleanup;
1196 }
1197
476b8477 1198 kfree(async->cmd.chanlist);
88bc0574 1199 async->cmd = cmd;
ed9eccbe
DS		 1200 async->cmd.data = NULL;
1201 /* load channel/gain list */
1202 async->cmd.chanlist =
476b8477 1203 kmalloc(async->cmd.chanlist_len * sizeof(int), GFP_KERNEL);
ed9eccbe
DS		 1204 if (!async->cmd.chanlist) {
1205 DPRINTK("allocation failed\n");
1206 ret = -ENOMEM;
1207 goto cleanup;
1208 }
1209
95bc359f 1210 if (copy_from_user(async->cmd.chanlist, user_chanlist,
476b8477 1211 async->cmd.chanlist_len * sizeof(int))) {
ed9eccbe
DS		 1212 DPRINTK("fault reading chanlist\n");
1213 ret = -EFAULT;
1214 goto cleanup;
1215 }
1216
1217 /* make sure each element in channel/gain list is valid */
21fe2eea
M		 1218 ret = comedi_check_chanlist(s,
1219 async->cmd.chanlist_len,
1220 async->cmd.chanlist);
476b8477 1221 if (ret < 0) {
ed9eccbe
DS		 1222 DPRINTK("bad chanlist\n");
1223 goto cleanup;
1224 }
1225
1226 ret = s->do_cmdtest(dev, s, &async->cmd);
1227
1228 if (async->cmd.flags & TRIG_BOGUS || ret) {
1229 DPRINTK("test returned %d\n", ret);
88bc0574 1230 cmd = async->cmd;
476b8477 1231 /* restore chanlist pointer before copying back */
95bc359f 1232 cmd.chanlist = (unsigned int __force *)user_chanlist;
88bc0574
HS		 1233 cmd.data = NULL;
1234 if (copy_to_user(arg, &cmd, sizeof(struct comedi_cmd))) {
ed9eccbe
DS		 1235 DPRINTK("fault writing cmd\n");
1236 ret = -EFAULT;
1237 goto cleanup;
1238 }
1239 ret = -EAGAIN;
1240 goto cleanup;
1241 }
1242
1243 if (!async->prealloc_bufsz) {
1244 ret = -ENOMEM;
1245 DPRINTK("no buffer (?)\n");
1246 goto cleanup;
1247 }
1248
1249 comedi_reset_async_buf(async);
1250
1251 async->cb_mask =
476b8477
GKH		 1252 COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR |
1253 COMEDI_CB_OVERFLOW;
1254 if (async->cmd.flags & TRIG_WAKE_EOS)
ed9eccbe 1255 async->cb_mask |= COMEDI_CB_EOS;
ed9eccbe
DS		 1256
1257 comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING);
1258
ed9eccbe
DS		 1259 ret = s->do_cmd(dev, s);
1260 if (ret == 0)
1261 return 0;
1262
476b8477 1263cleanup:
ed9eccbe
DS		 1264 do_become_nonbusy(dev, s);
1265
1266 return ret;
1267}
1268
1269/*
1270 COMEDI_CMDTEST
1271 command testing ioctl
1272
1273 arg:
1274 pointer to cmd structure
1275
1276 reads:
1277 cmd structure at arg
1278 channel/range list
1279
1280 writes:
1281 modified cmd structure at arg
1282
1283*/
92d0127c
GKH		 1284static int do_cmdtest_ioctl(struct comedi_device *dev,
1285 struct comedi_cmd __user *arg, void *file)
ed9eccbe 1286{
f8348677 1287 struct comedi_cmd cmd;
34c43922 1288 struct comedi_subdevice *s;
ed9eccbe
DS		 1289 int ret = 0;
1290 unsigned int *chanlist = NULL;
95bc359f 1291 unsigned int __user *user_chanlist;
ed9eccbe 1292
f8348677 1293 if (copy_from_user(&cmd, arg, sizeof(struct comedi_cmd))) {
ed9eccbe
DS		 1294 DPRINTK("bad cmd address\n");
1295 return -EFAULT;
1296 }
476b8477 1297 /* save user's chanlist pointer so it can be restored later */
95bc359f 1298 user_chanlist = (unsigned int __user *)cmd.chanlist;
ed9eccbe 1299
f8348677
HS		 1300 if (cmd.subdev >= dev->n_subdevices) {
1301 DPRINTK("%d no such subdevice\n", cmd.subdev);
ed9eccbe
DS		 1302 return -ENODEV;
1303 }
1304
f8348677 1305 s = &dev->subdevices[cmd.subdev];
ed9eccbe 1306 if (s->type == COMEDI_SUBD_UNUSED) {
f8348677 1307 DPRINTK("%d not valid subdevice\n", cmd.subdev);
ed9eccbe
DS		 1308 return -EIO;
1309 }
1310
1311 if (!s->do_cmd || !s->do_cmdtest) {
1312 DPRINTK("subdevice %i does not support commands\n",
f8348677 1313 cmd.subdev);
ed9eccbe
DS		 1314 return -EIO;
1315 }
1316
1317 /* make sure channel/gain list isn't too long */
f8348677 1318 if (cmd.chanlist_len > s->len_chanlist) {
ed9eccbe 1319 DPRINTK("channel/gain list too long %d > %d\n",
f8348677 1320 cmd.chanlist_len, s->len_chanlist);
ed9eccbe
DS		 1321 ret = -EINVAL;
1322 goto cleanup;
1323 }
1324
1325 /* load channel/gain list */
f8348677 1326 if (cmd.chanlist) {
ed9eccbe 1327 chanlist =
f8348677 1328 kmalloc(cmd.chanlist_len * sizeof(int), GFP_KERNEL);
ed9eccbe
DS		 1329 if (!chanlist) {
1330 DPRINTK("allocation failed\n");
1331 ret = -ENOMEM;
1332 goto cleanup;
1333 }
1334
95bc359f 1335 if (copy_from_user(chanlist, user_chanlist,
f8348677 1336 cmd.chanlist_len * sizeof(int))) {
ed9eccbe
DS		 1337 DPRINTK("fault reading chanlist\n");
1338 ret = -EFAULT;
1339 goto cleanup;
1340 }
1341
1342 /* make sure each element in channel/gain list is valid */
f8348677 1343 ret = comedi_check_chanlist(s, cmd.chanlist_len, chanlist);
476b8477 1344 if (ret < 0) {
ed9eccbe
DS		 1345 DPRINTK("bad chanlist\n");
1346 goto cleanup;
1347 }
1348
f8348677 1349 cmd.chanlist = chanlist;
ed9eccbe
DS		 1350 }
1351
f8348677 1352 ret = s->do_cmdtest(dev, s, &cmd);
ed9eccbe 1353
476b8477 1354 /* restore chanlist pointer before copying back */
95bc359f 1355 cmd.chanlist = (unsigned int __force *)user_chanlist;
ed9eccbe 1356
f8348677 1357 if (copy_to_user(arg, &cmd, sizeof(struct comedi_cmd))) {
ed9eccbe
DS		 1358 DPRINTK("bad cmd address\n");
1359 ret = -EFAULT;
1360 goto cleanup;
1361 }
476b8477
GKH		 1362cleanup:
1363 kfree(chanlist);
ed9eccbe
DS		 1364
1365 return ret;
1366}
1367
1368/*
1369 COMEDI_LOCK
1370 lock subdevice
1371
1372 arg:
1373 subdevice number
1374
1375 reads:
1376 none
1377
1378 writes:
1379 none
1380
1381*/
1382
0a85b6f0
MT		 1383static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg,
1384 void *file)
ed9eccbe
DS		 1385{
1386 int ret = 0;
1387 unsigned long flags;
34c43922 1388 struct comedi_subdevice *s;
ed9eccbe
DS		 1389
1390 if (arg >= dev->n_subdevices)
1391 return -EINVAL;
b077f2cd 1392 s = &dev->subdevices[arg];
ed9eccbe 1393
5f74ea14 1394 spin_lock_irqsave(&s->spin_lock, flags);
476b8477 1395 if (s->busy || s->lock)
ed9eccbe 1396 ret = -EBUSY;
476b8477 1397 else
ed9eccbe 1398 s->lock = file;
5f74ea14 1399 spin_unlock_irqrestore(&s->spin_lock, flags);
ed9eccbe 1400
c5274ab0 1401#if 0
ed9eccbe
DS		 1402 if (ret < 0)
1403 return ret;
1404
ed9eccbe
DS		 1405 if (s->lock_f)
1406 ret = s->lock_f(dev, s);
1407#endif
1408
1409 return ret;
1410}
1411
1412/*
1413 COMEDI_UNLOCK
1414 unlock subdevice
1415
1416 arg:
1417 subdevice number
1418
1419 reads:
1420 none
1421
1422 writes:
1423 none
1424
1425 This function isn't protected by the semaphore, since
1426 we already own the lock.
1427*/
0a85b6f0
MT		 1428static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg,
1429 void *file)
ed9eccbe 1430{
34c43922 1431 struct comedi_subdevice *s;
ed9eccbe
DS		 1432
1433 if (arg >= dev->n_subdevices)
1434 return -EINVAL;
b077f2cd 1435 s = &dev->subdevices[arg];
ed9eccbe
DS		 1436
1437 if (s->busy)
1438 return -EBUSY;
1439
1440 if (s->lock && s->lock != file)
1441 return -EACCES;
1442
1443 if (s->lock == file) {
1444#if 0
1445 if (s->unlock)
1446 s->unlock(dev, s);
1447#endif
1448
1449 s->lock = NULL;
1450 }
1451
1452 return 0;
1453}
1454
1455/*
1456 COMEDI_CANCEL
1457 cancel acquisition ioctl
1458
1459 arg:
1460 subdevice number
1461
1462 reads:
1463 nothing
1464
1465 writes:
1466 nothing
1467
1468*/
0a85b6f0
MT		 1469static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg,
1470 void *file)
ed9eccbe 1471{
34c43922 1472 struct comedi_subdevice *s;
ed9eccbe
DS		 1473
1474 if (arg >= dev->n_subdevices)
1475 return -EINVAL;
b077f2cd 1476 s = &dev->subdevices[arg];
ed9eccbe
DS		 1477 if (s->async == NULL)
1478 return -EINVAL;
1479
1480 if (s->lock && s->lock != file)
1481 return -EACCES;
1482
1483 if (!s->busy)
1484 return 0;
1485
1486 if (s->busy != file)
1487 return -EBUSY;
1488
1489 return do_cancel(dev, s);
1490}
1491
1492/*
1493 COMEDI_POLL ioctl
1494 instructs driver to synchronize buffers
1495
1496 arg:
1497 subdevice number
1498
1499 reads:
1500 nothing
1501
1502 writes:
1503 nothing
1504
1505*/
0a85b6f0
MT		 1506static int do_poll_ioctl(struct comedi_device *dev, unsigned int arg,
1507 void *file)
ed9eccbe 1508{
34c43922 1509 struct comedi_subdevice *s;
ed9eccbe
DS		 1510
1511 if (arg >= dev->n_subdevices)
1512 return -EINVAL;
b077f2cd 1513 s = &dev->subdevices[arg];
ed9eccbe
DS		 1514
1515 if (s->lock && s->lock != file)
1516 return -EACCES;
1517
1518 if (!s->busy)
1519 return 0;
1520
1521 if (s->busy != file)
1522 return -EBUSY;
1523
1524 if (s->poll)
1525 return s->poll(dev, s);
1526
1527 return -EINVAL;
1528}
1529
47db6d58
HS		 1530static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd,
1531 unsigned long arg)
1532{
1533 const unsigned minor = iminor(file->f_dentry->d_inode);
1534 struct comedi_device_file_info *dev_file_info =
1535 comedi_get_device_file_info(minor);
1536 struct comedi_device *dev;
1537 int rc;
1538
1539 if (dev_file_info == NULL || dev_file_info->device == NULL)
1540 return -ENODEV;
1541 dev = dev_file_info->device;
1542
1543 mutex_lock(&dev->mutex);
1544
1545 /* Device config is special, because it must work on
1546 * an unconfigured device. */
1547 if (cmd == COMEDI_DEVCONFIG) {
1548 rc = do_devconfig_ioctl(dev,
1549 (struct comedi_devconfig __user *)arg);
1550 goto done;
1551 }
1552
1553 if (!dev->attached) {
1554 DPRINTK("no driver configured on /dev/comedi%i\n", dev->minor);
1555 rc = -ENODEV;
1556 goto done;
1557 }
1558
1559 switch (cmd) {
1560 case COMEDI_BUFCONFIG:
1561 rc = do_bufconfig_ioctl(dev,
1562 (struct comedi_bufconfig __user *)arg);
1563 break;
1564 case COMEDI_DEVINFO:
1565 rc = do_devinfo_ioctl(dev, (struct comedi_devinfo __user *)arg,
1566 file);
1567 break;
1568 case COMEDI_SUBDINFO:
1569 rc = do_subdinfo_ioctl(dev,
1570 (struct comedi_subdinfo __user *)arg,
1571 file);
1572 break;
1573 case COMEDI_CHANINFO:
1574 rc = do_chaninfo_ioctl(dev, (void __user *)arg);
1575 break;
1576 case COMEDI_RANGEINFO:
1577 rc = do_rangeinfo_ioctl(dev, (void __user *)arg);
1578 break;
1579 case COMEDI_BUFINFO:
1580 rc = do_bufinfo_ioctl(dev,
1581 (struct comedi_bufinfo __user *)arg,
1582 file);
1583 break;
1584 case COMEDI_LOCK:
1585 rc = do_lock_ioctl(dev, arg, file);
1586 break;
1587 case COMEDI_UNLOCK:
1588 rc = do_unlock_ioctl(dev, arg, file);
1589 break;
1590 case COMEDI_CANCEL:
1591 rc = do_cancel_ioctl(dev, arg, file);
1592 break;
1593 case COMEDI_CMD:
1594 rc = do_cmd_ioctl(dev, (struct comedi_cmd __user *)arg, file);
1595 break;
1596 case COMEDI_CMDTEST:
1597 rc = do_cmdtest_ioctl(dev, (struct comedi_cmd __user *)arg,
1598 file);
1599 break;
1600 case COMEDI_INSNLIST:
1601 rc = do_insnlist_ioctl(dev,
1602 (struct comedi_insnlist __user *)arg,
1603 file);
1604 break;
1605 case COMEDI_INSN:
1606 rc = do_insn_ioctl(dev, (struct comedi_insn __user *)arg,
1607 file);
1608 break;
1609 case COMEDI_POLL:
1610 rc = do_poll_ioctl(dev, arg, file);
1611 break;
1612 default:
1613 rc = -ENOTTY;
1614 break;
1615 }
1616
1617done:
1618 mutex_unlock(&dev->mutex);
1619 return rc;
1620}
1621
34c43922 1622static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
ed9eccbe
DS		 1623{
1624 int ret = 0;
1625
1626 if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) && s->cancel)
1627 ret = s->cancel(dev, s);
1628
1629 do_become_nonbusy(dev, s);
1630
1631 return ret;
1632}
1633
df30b21c
FV		 1634
1635static void comedi_vm_open(struct vm_area_struct *area)
1636{
1637 struct comedi_async *async;
1638 struct comedi_device *dev;
1639
1640 async = area->vm_private_data;
1641 dev = async->subdevice->device;
1642
1643 mutex_lock(&dev->mutex);
1644 async->mmap_count++;
1645 mutex_unlock(&dev->mutex);
1646}
1647
1648static void comedi_vm_close(struct vm_area_struct *area)
ed9eccbe 1649{
d163679c 1650 struct comedi_async *async;
71b5f4f1 1651 struct comedi_device *dev;
ed9eccbe
DS		 1652
1653 async = area->vm_private_data;
1654 dev = async->subdevice->device;
1655
1656 mutex_lock(&dev->mutex);
1657 async->mmap_count--;
1658 mutex_unlock(&dev->mutex);
1659}
1660
1661static struct vm_operations_struct comedi_vm_ops = {
df30b21c
FV		 1662 .open = comedi_vm_open,
1663 .close = comedi_vm_close,
ed9eccbe
DS		 1664};
1665
1666static int comedi_mmap(struct file *file, struct vm_area_struct *vma)
1667{
1668 const unsigned minor = iminor(file->f_dentry->d_inode);
d163679c 1669 struct comedi_async *async = NULL;
ed9eccbe
DS		 1670 unsigned long start = vma->vm_start;
1671 unsigned long size;
1672 int n_pages;
1673 int i;
1674 int retval;
34c43922 1675 struct comedi_subdevice *s;
3ffab428
BP		 1676 struct comedi_device_file_info *dev_file_info;
1677 struct comedi_device *dev;
1678
1679 dev_file_info = comedi_get_device_file_info(minor);
1680 if (dev_file_info == NULL)
70fe742c 1681 return -ENODEV;
3ffab428
BP		 1682 dev = dev_file_info->device;
1683 if (dev == NULL)
70fe742c 1684 return -ENODEV;
ed9eccbe
DS		 1685
1686 mutex_lock(&dev->mutex);
1687 if (!dev->attached) {
1688 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1689 retval = -ENODEV;
1690 goto done;
1691 }
476b8477 1692 if (vma->vm_flags & VM_WRITE)
ed9eccbe 1693 s = comedi_get_write_subdevice(dev_file_info);
476b8477 1694 else
ed9eccbe 1695 s = comedi_get_read_subdevice(dev_file_info);
476b8477 1696
ed9eccbe
DS		 1697 if (s == NULL) {
1698 retval = -EINVAL;
1699 goto done;
1700 }
1701 async = s->async;
1702 if (async == NULL) {
1703 retval = -EINVAL;
1704 goto done;
1705 }
1706
1707 if (vma->vm_pgoff != 0) {
1708 DPRINTK("comedi: mmap() offset must be 0.\n");
1709 retval = -EINVAL;
1710 goto done;
1711 }
1712
1713 size = vma->vm_end - vma->vm_start;
1714 if (size > async->prealloc_bufsz) {
1715 retval = -EFAULT;
1716 goto done;
1717 }
1718 if (size & (~PAGE_MASK)) {
1719 retval = -EFAULT;
1720 goto done;
1721 }
1722
1723 n_pages = size >> PAGE_SHIFT;
1724 for (i = 0; i < n_pages; ++i) {
1725 if (remap_pfn_range(vma, start,
0a85b6f0
MT		 1726 page_to_pfn(virt_to_page
1727 (async->buf_page_list
1728 [i].virt_addr)), PAGE_SIZE,
1729 PAGE_SHARED)) {
ed9eccbe
DS		 1730 retval = -EAGAIN;
1731 goto done;
1732 }
1733 start += PAGE_SIZE;
1734 }
1735
1736 vma->vm_ops = &comedi_vm_ops;
1737 vma->vm_private_data = async;
1738
1739 async->mmap_count++;
1740
1741 retval = 0;
476b8477 1742done:
ed9eccbe
DS		 1743 mutex_unlock(&dev->mutex);
1744 return retval;
1745}
1746
1ae5062a 1747static unsigned int comedi_poll(struct file *file, poll_table *wait)
ed9eccbe
DS		 1748{
1749 unsigned int mask = 0;
1750 const unsigned minor = iminor(file->f_dentry->d_inode);
34c43922
BP		 1751 struct comedi_subdevice *read_subdev;
1752 struct comedi_subdevice *write_subdev;
3ffab428
BP		 1753 struct comedi_device_file_info *dev_file_info;
1754 struct comedi_device *dev;
1755 dev_file_info = comedi_get_device_file_info(minor);
1756
1757 if (dev_file_info == NULL)
70fe742c 1758 return -ENODEV;
3ffab428
BP		 1759 dev = dev_file_info->device;
1760 if (dev == NULL)
70fe742c 1761 return -ENODEV;
ed9eccbe
DS		 1762
1763 mutex_lock(&dev->mutex);
1764 if (!dev->attached) {
1765 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1766 mutex_unlock(&dev->mutex);
1767 return 0;
1768 }
1769
1770 mask = 0;
1771 read_subdev = comedi_get_read_subdevice(dev_file_info);
1772 if (read_subdev) {
1773 poll_wait(file, &read_subdev->async->wait_head, wait);
1774 if (!read_subdev->busy
476b8477
GKH		 1775 || comedi_buf_read_n_available(read_subdev->async) > 0
1776 || !(comedi_get_subdevice_runflags(read_subdev) &
1777 SRF_RUNNING)) {
ed9eccbe
DS		 1778 mask |= POLLIN | POLLRDNORM;
1779 }
1780 }
1781 write_subdev = comedi_get_write_subdevice(dev_file_info);
1782 if (write_subdev) {
1783 poll_wait(file, &write_subdev->async->wait_head, wait);
476b8477
GKH		 1784 comedi_buf_write_alloc(write_subdev->async,
1785 write_subdev->async->prealloc_bufsz);
ed9eccbe 1786 if (!write_subdev->busy
476b8477
GKH		 1787 || !(comedi_get_subdevice_runflags(write_subdev) &
1788 SRF_RUNNING)
1789 || comedi_buf_write_n_allocated(write_subdev->async) >=
1790 bytes_per_sample(write_subdev->async->subdevice)) {
ed9eccbe
DS		 1791 mask |= POLLOUT | POLLWRNORM;
1792 }
1793 }
1794
1795 mutex_unlock(&dev->mutex);
1796 return mask;
1797}
1798
92d0127c
GKH		 1799static ssize_t comedi_write(struct file *file, const char __user *buf,
1800 size_t nbytes, loff_t *offset)
ed9eccbe 1801{
34c43922 1802 struct comedi_subdevice *s;
d163679c 1803 struct comedi_async *async;
ed9eccbe
DS		 1804 int n, m, count = 0, retval = 0;
1805 DECLARE_WAITQUEUE(wait, current);
1806 const unsigned minor = iminor(file->f_dentry->d_inode);
3ffab428
BP		 1807 struct comedi_device_file_info *dev_file_info;
1808 struct comedi_device *dev;
1809 dev_file_info = comedi_get_device_file_info(minor);
1810
1811 if (dev_file_info == NULL)
70fe742c 1812 return -ENODEV;
3ffab428
BP		 1813 dev = dev_file_info->device;
1814 if (dev == NULL)
70fe742c 1815 return -ENODEV;
ed9eccbe
DS		 1816
1817 if (!dev->attached) {
1818 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1819 retval = -ENODEV;
1820 goto done;
1821 }
1822
1823 s = comedi_get_write_subdevice(dev_file_info);
1824 if (s == NULL) {
1825 retval = -EIO;
1826 goto done;
1827 }
1828 async = s->async;
1829
1830 if (!nbytes) {
1831 retval = 0;
1832 goto done;
1833 }
1834 if (!s->busy) {
1835 retval = 0;
1836 goto done;
1837 }
1838 if (s->busy != file) {
1839 retval = -EACCES;
1840 goto done;
1841 }
1842 add_wait_queue(&async->wait_head, &wait);
1843 while (nbytes > 0 && !retval) {
1844 set_current_state(TASK_INTERRUPTIBLE);
1845
d2611540
IA		 1846 if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) {
1847 if (count == 0) {
1848 if (comedi_get_subdevice_runflags(s) &
1849 SRF_ERROR) {
1850 retval = -EPIPE;
1851 } else {
1852 retval = 0;
1853 }
1854 do_become_nonbusy(dev, s);
1855 }
1856 break;
1857 }
1858
ed9eccbe
DS		 1859 n = nbytes;
1860
1861 m = n;
476b8477 1862 if (async->buf_write_ptr + m > async->prealloc_bufsz)
ed9eccbe 1863 m = async->prealloc_bufsz - async->buf_write_ptr;
ed9eccbe 1864 comedi_buf_write_alloc(async, async->prealloc_bufsz);
476b8477 1865 if (m > comedi_buf_write_n_allocated(async))
ed9eccbe 1866 m = comedi_buf_write_n_allocated(async);
ed9eccbe
DS		 1867 if (m < n)
1868 n = m;
1869
1870 if (n == 0) {
ed9eccbe
DS		 1871 if (file->f_flags & O_NONBLOCK) {
1872 retval = -EAGAIN;
1873 break;
1874 }
6a9ce6b6 1875 schedule();
ed9eccbe
DS		 1876 if (signal_pending(current)) {
1877 retval = -ERESTARTSYS;
1878 break;
1879 }
476b8477 1880 if (!s->busy)
ed9eccbe 1881 break;
ed9eccbe
DS		 1882 if (s->busy != file) {
1883 retval = -EACCES;
1884 break;
1885 }
1886 continue;
1887 }
1888
1889 m = copy_from_user(async->prealloc_buf + async->buf_write_ptr,
476b8477 1890 buf, n);
ed9eccbe
DS		 1891 if (m) {
1892 n -= m;
1893 retval = -EFAULT;
1894 }
1895 comedi_buf_write_free(async, n);
1896
1897 count += n;
1898 nbytes -= n;
1899
1900 buf += n;
1901 break; /* makes device work like a pipe */
1902 }
1903 set_current_state(TASK_RUNNING);
1904 remove_wait_queue(&async->wait_head, &wait);
1905
1906done:
476b8477 1907 return count ? count : retval;
ed9eccbe
DS		 1908}
1909
92d0127c 1910static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes,
6705b68d 1911 loff_t *offset)
ed9eccbe 1912{
34c43922 1913 struct comedi_subdevice *s;
d163679c 1914 struct comedi_async *async;
ed9eccbe
DS		 1915 int n, m, count = 0, retval = 0;
1916 DECLARE_WAITQUEUE(wait, current);
1917 const unsigned minor = iminor(file->f_dentry->d_inode);
3ffab428
BP		 1918 struct comedi_device_file_info *dev_file_info;
1919 struct comedi_device *dev;
1920 dev_file_info = comedi_get_device_file_info(minor);
1921
1922 if (dev_file_info == NULL)
70fe742c 1923 return -ENODEV;
3ffab428
BP		 1924 dev = dev_file_info->device;
1925 if (dev == NULL)
70fe742c 1926 return -ENODEV;
ed9eccbe
DS		 1927
1928 if (!dev->attached) {
1929 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1930 retval = -ENODEV;
1931 goto done;
1932 }
1933
1934 s = comedi_get_read_subdevice(dev_file_info);
1935 if (s == NULL) {
1936 retval = -EIO;
1937 goto done;
1938 }
1939 async = s->async;
1940 if (!nbytes) {
1941 retval = 0;
1942 goto done;
1943 }
1944 if (!s->busy) {
1945 retval = 0;
1946 goto done;
1947 }
1948 if (s->busy != file) {
1949 retval = -EACCES;
1950 goto done;
1951 }
1952
1953 add_wait_queue(&async->wait_head, &wait);
1954 while (nbytes > 0 && !retval) {
1955 set_current_state(TASK_INTERRUPTIBLE);
1956
1957 n = nbytes;
1958
1959 m = comedi_buf_read_n_available(async);
476b8477
GKH		 1960 /* printk("%d available\n",m); */
1961 if (async->buf_read_ptr + m > async->prealloc_bufsz)
ed9eccbe 1962 m = async->prealloc_bufsz - async->buf_read_ptr;
476b8477 1963 /* printk("%d contiguous\n",m); */
ed9eccbe
DS		 1964 if (m < n)
1965 n = m;
1966
1967 if (n == 0) {
1968 if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) {
1969 do_become_nonbusy(dev, s);
1970 if (comedi_get_subdevice_runflags(s) &
476b8477 1971 SRF_ERROR) {
ed9eccbe
DS		 1972 retval = -EPIPE;
1973 } else {
1974 retval = 0;
1975 }
1976 break;
1977 }
1978 if (file->f_flags & O_NONBLOCK) {
1979 retval = -EAGAIN;
1980 break;
1981 }
6a9ce6b6 1982 schedule();
ed9eccbe
DS		 1983 if (signal_pending(current)) {
1984 retval = -ERESTARTSYS;
1985 break;
1986 }
ed9eccbe
DS		 1987 if (!s->busy) {
1988 retval = 0;
1989 break;
1990 }
1991 if (s->busy != file) {
1992 retval = -EACCES;
1993 break;
1994 }
1995 continue;
1996 }
1997 m = copy_to_user(buf, async->prealloc_buf +
476b8477 1998 async->buf_read_ptr, n);
ed9eccbe
DS		 1999 if (m) {
2000 n -= m;
2001 retval = -EFAULT;
2002 }
2003
2004 comedi_buf_read_alloc(async, n);
2005 comedi_buf_read_free(async, n);
2006
2007 count += n;
2008 nbytes -= n;
2009
2010 buf += n;
2011 break; /* makes device work like a pipe */
2012 }
2013 if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | SRF_RUNNING)) &&
476b8477 2014 async->buf_read_count - async->buf_write_count == 0) {
ed9eccbe
DS		 2015 do_become_nonbusy(dev, s);
2016 }
2017 set_current_state(TASK_RUNNING);
2018 remove_wait_queue(&async->wait_head, &wait);
2019
2020done:
476b8477 2021 return count ? count : retval;
ed9eccbe
DS		 2022}
2023
2024/*
2025 This function restores a subdevice to an idle state.
2026 */
3e76c951
HS		 2027static void do_become_nonbusy(struct comedi_device *dev,
2028 struct comedi_subdevice *s)
ed9eccbe 2029{
d163679c 2030 struct comedi_async *async = s->async;
ed9eccbe
DS		 2031
2032 comedi_set_subdevice_runflags(s, SRF_RUNNING, 0);
ed9eccbe
DS		 2033 if (async) {
2034 comedi_reset_async_buf(async);
2035 async->inttrig = NULL;
2036 } else {
4f870fe6
IA		 2037 dev_err(dev->class_dev,
2038 "BUG: (?) do_become_nonbusy called with async=NULL\n");
ed9eccbe
DS		 2039 }
2040
2041 s->busy = NULL;
2042}
2043
2044static int comedi_open(struct inode *inode, struct file *file)
2045{
ed9eccbe 2046 const unsigned minor = iminor(inode);
476b8477
GKH		 2047 struct comedi_device_file_info *dev_file_info =
2048 comedi_get_device_file_info(minor);
0a85b6f0
MT		 2049 struct comedi_device *dev =
2050 dev_file_info ? dev_file_info->device : NULL;
97920071 2051
ed9eccbe
DS		 2052 if (dev == NULL) {
2053 DPRINTK("invalid minor number\n");
2054 return -ENODEV;
2055 }
2056
2057 /* This is slightly hacky, but we want module autoloading
2058 * to work for root.
2059 * case: user opens device, attached -> ok
2060 * case: user opens device, unattached, in_request_module=0 -> autoload
2061 * case: user opens device, unattached, in_request_module=1 -> fail
2062 * case: root opens device, attached -> ok
2063 * case: root opens device, unattached, in_request_module=1 -> ok
2064 * (typically called from modprobe)
2065 * case: root opens device, unattached, in_request_module=0 -> autoload
2066 *
2067 * The last could be changed to "-> ok", which would deny root
2068 * autoloading.
2069 */
2070 mutex_lock(&dev->mutex);
2071 if (dev->attached)
2072 goto ok;
a8f80e8f 2073 if (!capable(CAP_NET_ADMIN) && dev->in_request_module) {
ed9eccbe
DS		 2074 DPRINTK("in request module\n");
2075 mutex_unlock(&dev->mutex);
2076 return -ENODEV;
2077 }
a8f80e8f 2078 if (capable(CAP_NET_ADMIN) && dev->in_request_module)
ed9eccbe
DS		 2079 goto ok;
2080
2081 dev->in_request_module = 1;
2082
ed9eccbe
DS		 2083#ifdef CONFIG_KMOD
2084 mutex_unlock(&dev->mutex);
56d92c60 2085 request_module("char-major-%i-%i", COMEDI_MAJOR, dev->minor);
ed9eccbe
DS		 2086 mutex_lock(&dev->mutex);
2087#endif
2088
2089 dev->in_request_module = 0;
2090
a8f80e8f
EP		 2091 if (!dev->attached && !capable(CAP_NET_ADMIN)) {
2092 DPRINTK("not attached and not CAP_NET_ADMIN\n");
ed9eccbe
DS		 2093 mutex_unlock(&dev->mutex);
2094 return -ENODEV;
2095 }
2096ok:
2097 __module_get(THIS_MODULE);
2098
2099 if (dev->attached) {
2100 if (!try_module_get(dev->driver->module)) {
2101 module_put(THIS_MODULE);
2102 mutex_unlock(&dev->mutex);
2103 return -ENOSYS;
2104 }
2105 }
2106
3c17ba07
IA		 2107 if (dev->attached && dev->use_count == 0 && dev->open) {
2108 int rc = dev->open(dev);
2109 if (rc < 0) {
2110 module_put(dev->driver->module);
2111 module_put(THIS_MODULE);
2112 mutex_unlock(&dev->mutex);
2113 return rc;
2114 }
2115 }
ed9eccbe
DS		 2116
2117 dev->use_count++;
2118
a5011a26 2119 mutex_unlock(&dev->mutex);
ed9eccbe 2120
a5011a26 2121 return 0;
ed9eccbe
DS		 2122}
2123
a5011a26 2124static int comedi_close(struct inode *inode, struct file *file)
ed9eccbe 2125{
a5011a26
HS		 2126 const unsigned minor = iminor(inode);
2127 struct comedi_subdevice *s = NULL;
ed9eccbe 2128 int i;
a5011a26
HS		 2129 struct comedi_device_file_info *dev_file_info;
2130 struct comedi_device *dev;
2131 dev_file_info = comedi_get_device_file_info(minor);
ed9eccbe 2132
a5011a26
HS		 2133 if (dev_file_info == NULL)
2134 return -ENODEV;
2135 dev = dev_file_info->device;
2136 if (dev == NULL)
2137 return -ENODEV;
ed9eccbe 2138
a5011a26
HS		 2139 mutex_lock(&dev->mutex);
2140
2141 if (dev->subdevices) {
2142 for (i = 0; i < dev->n_subdevices; i++) {
b077f2cd 2143 s = &dev->subdevices[i];
a5011a26
HS		 2144
2145 if (s->busy == file)
2146 do_cancel(dev, s);
2147 if (s->lock == file)
2148 s->lock = NULL;
2149 }
ed9eccbe 2150 }
a5011a26
HS		 2151 if (dev->attached && dev->use_count == 1 && dev->close)
2152 dev->close(dev);
2153
2154 module_put(THIS_MODULE);
2155 if (dev->attached)
2156 module_put(dev->driver->module);
2157
2158 dev->use_count--;
2159
2160 mutex_unlock(&dev->mutex);
2161
2162 if (file->f_flags & FASYNC)
2163 comedi_fasync(-1, file, 0);
ed9eccbe
DS		 2164
2165 return 0;
2166}
2167
a5011a26 2168static int comedi_fasync(int fd, struct file *file, int on)
ed9eccbe 2169{
a5011a26
HS		 2170 const unsigned minor = iminor(file->f_dentry->d_inode);
2171 struct comedi_device_file_info *dev_file_info;
2172 struct comedi_device *dev;
2173 dev_file_info = comedi_get_device_file_info(minor);
ed9eccbe 2174
a5011a26
HS		 2175 if (dev_file_info == NULL)
2176 return -ENODEV;
2177 dev = dev_file_info->device;
476b8477 2178 if (dev == NULL)
a5011a26
HS		 2179 return -ENODEV;
2180
2181 return fasync_helper(fd, file, on, &dev->async_queue);
ed9eccbe
DS		 2182}
2183
8cb8aad7 2184static const struct file_operations comedi_fops = {
a5011a26
HS		 2185 .owner = THIS_MODULE,
2186 .unlocked_ioctl = comedi_unlocked_ioctl,
2187 .compat_ioctl = comedi_compat_ioctl,
2188 .open = comedi_open,
2189 .release = comedi_close,
2190 .read = comedi_read,
2191 .write = comedi_write,
2192 .mmap = comedi_mmap,
2193 .poll = comedi_poll,
2194 .fasync = comedi_fasync,
2195 .llseek = noop_llseek,
2196};
2197
8cb8aad7 2198static struct class *comedi_class;
a5011a26
HS		 2199static struct cdev comedi_cdev;
2200
2201static void comedi_cleanup_legacy_minors(void)
ed9eccbe 2202{
ed9eccbe
DS		 2203 unsigned i;
2204
a5011a26 2205 for (i = 0; i < comedi_num_legacy_minors; i++)
883db3d9 2206 comedi_free_board_minor(i);
ed9eccbe
DS		 2207}
2208
a5011a26 2209static int __init comedi_init(void)
ed9eccbe 2210{
a5011a26
HS		 2211 int i;
2212 int retval;
ed9eccbe 2213
4f870fe6 2214 pr_info("comedi: version " COMEDI_RELEASE " - http://www.comedi.org\n");
ed9eccbe 2215
a5011a26
HS		 2216 if (comedi_num_legacy_minors < 0 ||
2217 comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) {
4f870fe6
IA		 2218 pr_err("comedi: error: invalid value for module parameter \"comedi_num_legacy_minors\". Valid values are 0 through %i.\n",
2219 COMEDI_NUM_BOARD_MINORS);
a5011a26 2220 return -EINVAL;
ed9eccbe 2221 }
c43435d7 2222
a5011a26
HS		 2223 /*
2224 * comedi is unusable if both comedi_autoconfig and
2225 * comedi_num_legacy_minors are zero, so we might as well adjust the
2226 * defaults in that case
2227 */
2228 if (comedi_autoconfig == 0 && comedi_num_legacy_minors == 0)
2229 comedi_num_legacy_minors = 16;
c43435d7 2230
a5011a26
HS		 2231 memset(comedi_file_info_table, 0,
2232 sizeof(struct comedi_device_file_info *) * COMEDI_NUM_MINORS);
ed9eccbe 2233
a5011a26
HS		 2234 retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2235 COMEDI_NUM_MINORS, "comedi");
2236 if (retval)
2237 return -EIO;
2238 cdev_init(&comedi_cdev, &comedi_fops);
2239 comedi_cdev.owner = THIS_MODULE;
2240 kobject_set_name(&comedi_cdev.kobj, "comedi");
2241 if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) {
2242 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2243 COMEDI_NUM_MINORS);
2244 return -EIO;
883db3d9 2245 }
a5011a26
HS		 2246 comedi_class = class_create(THIS_MODULE, "comedi");
2247 if (IS_ERR(comedi_class)) {
4f870fe6 2248 pr_err("comedi: failed to create class\n");
a5011a26
HS		 2249 cdev_del(&comedi_cdev);
2250 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2251 COMEDI_NUM_MINORS);
2252 return PTR_ERR(comedi_class);
883db3d9 2253 }
a5011a26 2254
fb60367d
HS		 2255 comedi_class->dev_attrs = comedi_dev_attrs;
2256
a5011a26
HS		 2257 /* XXX requires /proc interface */
2258 comedi_proc_init();
2259
2260 /* create devices files for legacy/manual use */
2261 for (i = 0; i < comedi_num_legacy_minors; i++) {
2262 int minor;
2263 minor = comedi_alloc_board_minor(NULL);
2264 if (minor < 0) {
2265 comedi_cleanup_legacy_minors();
2266 cdev_del(&comedi_cdev);
2267 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2268 COMEDI_NUM_MINORS);
2269 return minor;
2270 }
883db3d9 2271 }
a5011a26
HS		 2272
2273 return 0;
ed9eccbe
DS		 2274}
2275
a5011a26 2276static void __exit comedi_cleanup(void)
ed9eccbe 2277{
a5011a26 2278 int i;
ed9eccbe 2279
a5011a26
HS		 2280 comedi_cleanup_legacy_minors();
2281 for (i = 0; i < COMEDI_NUM_MINORS; ++i)
2282 BUG_ON(comedi_file_info_table[i]);
ed9eccbe 2283
a5011a26
HS		 2284 class_destroy(comedi_class);
2285 cdev_del(&comedi_cdev);
2286 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS);
ed9eccbe 2287
a5011a26 2288 comedi_proc_cleanup();
ed9eccbe
DS		 2289}
2290
a5011a26
HS		 2291module_init(comedi_init);
2292module_exit(comedi_cleanup);
ed9eccbe 2293
a5011a26
HS		 2294void comedi_error(const struct comedi_device *dev, const char *s)
2295{
4f870fe6 2296 dev_err(dev->class_dev, "%s: %s\n", dev->driver->driver_name, s);
ed9eccbe 2297}
a5011a26 2298EXPORT_SYMBOL(comedi_error);
883db3d9 2299
a5011a26 2300void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s)
883db3d9 2301{
a5011a26
HS		 2302 struct comedi_async *async = s->async;
2303 unsigned runflags = 0;
2304 unsigned runflags_mask = 0;
883db3d9 2305
a5011a26 2306 /* DPRINTK("comedi_event 0x%x\n",mask); */
883db3d9 2307
a5011a26
HS		 2308 if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) == 0)
2309 return;
2310
2311 if (s->
2312 async->events & (COMEDI_CB_EOA | COMEDI_CB_ERROR |
2313 COMEDI_CB_OVERFLOW)) {
2314 runflags_mask |= SRF_RUNNING;
883db3d9 2315 }
a5011a26
HS		 2316 /* remember if an error event has occurred, so an error
2317 * can be returned the next time the user does a read() */
2318 if (s->async->events & (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) {
2319 runflags_mask |= SRF_ERROR;
2320 runflags |= SRF_ERROR;
883db3d9 2321 }
a5011a26
HS		 2322 if (runflags_mask) {
2323 /*sets SRF_ERROR and SRF_RUNNING together atomically */
2324 comedi_set_subdevice_runflags(s, runflags_mask, runflags);
883db3d9
FMH		 2325 }
2326
a5011a26
HS		 2327 if (async->cb_mask & s->async->events) {
2328 if (comedi_get_subdevice_runflags(s) & SRF_USER) {
2329 wake_up_interruptible(&async->wait_head);
2330 if (s->subdev_flags & SDF_CMD_READ)
2331 kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
2332 if (s->subdev_flags & SDF_CMD_WRITE)
2333 kill_fasync(&dev->async_queue, SIGIO, POLL_OUT);
2334 } else {
2335 if (async->cb_func)
2336 async->cb_func(s->async->events, async->cb_arg);
2337 }
2338 }
2339 s->async->events = 0;
883db3d9 2340}
a5011a26 2341EXPORT_SYMBOL(comedi_event);
883db3d9 2342
a5011a26 2343unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s)
883db3d9 2344{
a5011a26
HS		 2345 unsigned long flags;
2346 unsigned runflags;
883db3d9 2347
a5011a26
HS		 2348 spin_lock_irqsave(&s->spin_lock, flags);
2349 runflags = s->runflags;
2350 spin_unlock_irqrestore(&s->spin_lock, flags);
2351 return runflags;
883db3d9 2352}
a5011a26 2353EXPORT_SYMBOL(comedi_get_subdevice_runflags);
883db3d9 2354
a5011a26 2355static int is_device_busy(struct comedi_device *dev)
883db3d9 2356{
a5011a26
HS		 2357 struct comedi_subdevice *s;
2358 int i;
883db3d9 2359
a5011a26
HS		 2360 if (!dev->attached)
2361 return 0;
883db3d9 2362
a5011a26 2363 for (i = 0; i < dev->n_subdevices; i++) {
b077f2cd 2364 s = &dev->subdevices[i];
a5011a26
HS		 2365 if (s->busy)
2366 return 1;
2367 if (s->async && s->async->mmap_count)
2368 return 1;
883db3d9 2369 }
883db3d9 2370
a5011a26 2371 return 0;
883db3d9
FMH		 2372}
2373
a5011a26
HS		 2374static void comedi_device_init(struct comedi_device *dev)
2375{
2376 memset(dev, 0, sizeof(struct comedi_device));
2377 spin_lock_init(&dev->spinlock);
2378 mutex_init(&dev->mutex);
2379 dev->minor = -1;
2380}
883db3d9 2381
a5011a26 2382static void comedi_device_cleanup(struct comedi_device *dev)
883db3d9 2383{
a5011a26
HS		 2384 if (dev == NULL)
2385 return;
2386 mutex_lock(&dev->mutex);
2387 comedi_device_detach(dev);
2388 mutex_unlock(&dev->mutex);
2389 mutex_destroy(&dev->mutex);
2390}
2391
2392int comedi_alloc_board_minor(struct device *hardware_device)
2393{
2394 struct comedi_device_file_info *info;
2395 struct device *csdev;
2396 unsigned i;
a5011a26
HS		 2397
2398 info = kzalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL);
2399 if (info == NULL)
2400 return -ENOMEM;
2401 info->device = kzalloc(sizeof(struct comedi_device), GFP_KERNEL);
2402 if (info->device == NULL) {
2403 kfree(info);
2404 return -ENOMEM;
2405 }
2406 info->hardware_device = hardware_device;
2407 comedi_device_init(info->device);
2408 spin_lock(&comedi_file_info_table_lock);
2409 for (i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i) {
2410 if (comedi_file_info_table[i] == NULL) {
2411 comedi_file_info_table[i] = info;
2412 break;
2413 }
2414 }
2415 spin_unlock(&comedi_file_info_table_lock);
2416 if (i == COMEDI_NUM_BOARD_MINORS) {
2417 comedi_device_cleanup(info->device);
2418 kfree(info->device);
2419 kfree(info);
4f870fe6 2420 pr_err("comedi: error: ran out of minor numbers for board device files.\n");
a5011a26
HS		 2421 return -EBUSY;
2422 }
2423 info->device->minor = i;
2424 csdev = device_create(comedi_class, hardware_device,
2425 MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i", i);
2426 if (!IS_ERR(csdev))
2427 info->device->class_dev = csdev;
2428 dev_set_drvdata(csdev, info);
883db3d9 2429
a5011a26 2430 return i;
883db3d9
FMH		 2431}
2432
a5011a26 2433void comedi_free_board_minor(unsigned minor)
883db3d9 2434{
a5011a26 2435 struct comedi_device_file_info *info;
883db3d9 2436
a5011a26
HS		 2437 BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS);
2438 spin_lock(&comedi_file_info_table_lock);
2439 info = comedi_file_info_table[minor];
2440 comedi_file_info_table[minor] = NULL;
2441 spin_unlock(&comedi_file_info_table_lock);
883db3d9 2442
a5011a26
HS		 2443 if (info) {
2444 struct comedi_device *dev = info->device;
2445 if (dev) {
2446 if (dev->class_dev) {
2447 device_destroy(comedi_class,
2448 MKDEV(COMEDI_MAJOR, dev->minor));
2449 }
2450 comedi_device_cleanup(dev);
2451 kfree(dev);
2452 }
2453 kfree(info);
883db3d9 2454 }
883db3d9
FMH		 2455}
2456
a5011a26 2457int comedi_find_board_minor(struct device *hardware_device)
883db3d9 2458{
a5011a26
HS		 2459 int minor;
2460 struct comedi_device_file_info *info;
883db3d9 2461
a5011a26
HS		 2462 for (minor = 0; minor < COMEDI_NUM_BOARD_MINORS; minor++) {
2463 spin_lock(&comedi_file_info_table_lock);
2464 info = comedi_file_info_table[minor];
2465 if (info && info->hardware_device == hardware_device) {
2466 spin_unlock(&comedi_file_info_table_lock);
2467 return minor;
2468 }
2469 spin_unlock(&comedi_file_info_table_lock);
883db3d9 2470 }
a5011a26 2471 return -ENODEV;
883db3d9
FMH		 2472}
2473
a5011a26
HS		 2474int comedi_alloc_subdevice_minor(struct comedi_device *dev,
2475 struct comedi_subdevice *s)
883db3d9 2476{
a5011a26
HS		 2477 struct comedi_device_file_info *info;
2478 struct device *csdev;
2479 unsigned i;
883db3d9 2480
a5011a26
HS		 2481 info = kmalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL);
2482 if (info == NULL)
2483 return -ENOMEM;
2484 info->device = dev;
2485 info->read_subdevice = s;
2486 info->write_subdevice = s;
2487 spin_lock(&comedi_file_info_table_lock);
2488 for (i = COMEDI_FIRST_SUBDEVICE_MINOR; i < COMEDI_NUM_MINORS; ++i) {
2489 if (comedi_file_info_table[i] == NULL) {
2490 comedi_file_info_table[i] = info;
2491 break;
2492 }
2493 }
2494 spin_unlock(&comedi_file_info_table_lock);
2495 if (i == COMEDI_NUM_MINORS) {
2496 kfree(info);
4f870fe6 2497 pr_err("comedi: error: ran out of minor numbers for board device files.\n");
a5011a26
HS		 2498 return -EBUSY;
2499 }
2500 s->minor = i;
2501 csdev = device_create(comedi_class, dev->class_dev,
2502 MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i_subd%i",
2503 dev->minor, (int)(s - dev->subdevices));
2504 if (!IS_ERR(csdev))
2505 s->class_dev = csdev;
2506 dev_set_drvdata(csdev, info);
883db3d9 2507
a5011a26 2508 return i;
883db3d9
FMH		 2509}
2510
a5011a26 2511void comedi_free_subdevice_minor(struct comedi_subdevice *s)
883db3d9 2512{
a5011a26 2513 struct comedi_device_file_info *info;
883db3d9 2514
a5011a26
HS		 2515 if (s == NULL)
2516 return;
2517 if (s->minor < 0)
2518 return;
883db3d9 2519
a5011a26
HS		 2520 BUG_ON(s->minor >= COMEDI_NUM_MINORS);
2521 BUG_ON(s->minor < COMEDI_FIRST_SUBDEVICE_MINOR);
883db3d9 2522
a5011a26
HS		 2523 spin_lock(&comedi_file_info_table_lock);
2524 info = comedi_file_info_table[s->minor];
2525 comedi_file_info_table[s->minor] = NULL;
2526 spin_unlock(&comedi_file_info_table_lock);
883db3d9 2527
a5011a26
HS		 2528 if (s->class_dev) {
2529 device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor));
2530 s->class_dev = NULL;
883db3d9 2531 }
a5011a26 2532 kfree(info);
883db3d9
FMH		 2533}
2534
a5011a26
HS		 2535struct comedi_device_file_info *comedi_get_device_file_info(unsigned minor)
2536{
2537 struct comedi_device_file_info *info;
2538
2539 BUG_ON(minor >= COMEDI_NUM_MINORS);
2540 spin_lock(&comedi_file_info_table_lock);
2541 info = comedi_file_info_table[minor];
2542 spin_unlock(&comedi_file_info_table_lock);
2543 return info;
2544}
2545EXPORT_SYMBOL_GPL(comedi_get_device_file_info);
Linux kernel - Deliverables
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