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staging: comedi: pcm_common: remove module
[thirdparty/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
ed9eccbe
DS		 26#include "comedi_compat32.h"
27
28#include <linux/module.h>
29#include <linux/errno.h>
30#include <linux/kernel.h>
31#include <linux/sched.h>
32#include <linux/fcntl.h>
33#include <linux/delay.h>
34#include <linux/ioport.h>
35#include <linux/mm.h>
36#include <linux/slab.h>
37#include <linux/kmod.h>
38#include <linux/poll.h>
39#include <linux/init.h>
40#include <linux/device.h>
41#include <linux/vmalloc.h>
42#include <linux/fs.h>
43#include "comedidev.h"
44#include <linux/cdev.h>
883db3d9 45#include <linux/stat.h>
ed9eccbe 46
476b8477
GKH		 47#include <linux/io.h>
48#include <linux/uaccess.h>
ed9eccbe 49
3a5fa275 50#include "comedi_internal.h"
ed9eccbe
DS		 51
52MODULE_AUTHOR("http://www.comedi.org");
53MODULE_DESCRIPTION("Comedi core module");
54MODULE_LICENSE("GPL");
55
56#ifdef CONFIG_COMEDI_DEBUG
57int comedi_debug;
18736438 58EXPORT_SYMBOL(comedi_debug);
4d7df821
IA		 59module_param(comedi_debug, int, S_IRUGO | S_IWUSR);
60MODULE_PARM_DESC(comedi_debug,
61 "enable comedi core and driver debugging if non-zero (default 0)"
62 );
ed9eccbe
DS		 63#endif
64
90ab5ee9 65bool comedi_autoconfig = 1;
4d7df821
IA		 66module_param(comedi_autoconfig, bool, S_IRUGO);
67MODULE_PARM_DESC(comedi_autoconfig,
68 "enable drivers to auto-configure comedi devices (default 1)");
6a9d7a21 69
92d0127c 70static int comedi_num_legacy_minors;
4d7df821
IA		 71module_param(comedi_num_legacy_minors, int, S_IRUGO);
72MODULE_PARM_DESC(comedi_num_legacy_minors,
73 "number of comedi minor devices to reserve for non-auto-configured devices (default 0)"
74 );
75
234bb3c6 76unsigned int comedi_default_buf_size_kb = CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB;
4d7df821
IA		 77module_param(comedi_default_buf_size_kb, uint, S_IRUGO | S_IWUSR);
78MODULE_PARM_DESC(comedi_default_buf_size_kb,
79 "default asynchronous buffer size in KiB (default "
234bb3c6 80 __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB) ")");
4d7df821 81
234bb3c6
IA		 82unsigned int comedi_default_buf_maxsize_kb
83 = CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB;
4d7df821
IA		 84module_param(comedi_default_buf_maxsize_kb, uint, S_IRUGO | S_IWUSR);
85MODULE_PARM_DESC(comedi_default_buf_maxsize_kb,
86 "default maximum size of asynchronous buffer in KiB (default "
234bb3c6 87 __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB) ")");
1dd33ab8 88
ed9eccbe 89static DEFINE_SPINLOCK(comedi_file_info_table_lock);
476b8477 90static struct comedi_device_file_info
0a85b6f0 91*comedi_file_info_table[COMEDI_NUM_MINORS];
476b8477 92
f5283a4b 93static void do_become_nonbusy(struct comedi_device *dev,
0a85b6f0 94 struct comedi_subdevice *s);
34c43922 95static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s);
ed9eccbe
DS		 96
97static int comedi_fasync(int fd, struct file *file, int on);
98
71b5f4f1 99static int is_device_busy(struct comedi_device *dev);
a5011a26 100
883db3d9
FMH		 101static int resize_async_buffer(struct comedi_device *dev,
102 struct comedi_subdevice *s,
a5011a26
HS		 103 struct comedi_async *async, unsigned new_size)
104{
105 int retval;
106
107 if (new_size > async->max_bufsize)
108 return -EPERM;
109
110 if (s->busy) {
111 DPRINTK("subdevice is busy, cannot resize buffer\n");
112 return -EBUSY;
113 }
114 if (async->mmap_count) {
115 DPRINTK("subdevice is mmapped, cannot resize buffer\n");
116 return -EBUSY;
117 }
118
119 if (!async->prealloc_buf)
120 return -EINVAL;
121
122 /* make sure buffer is an integral number of pages
123 * (we round up) */
124 new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK;
125
126 retval = comedi_buf_alloc(dev, s, new_size);
127 if (retval < 0)
128 return retval;
129
130 if (s->buf_change) {
131 retval = s->buf_change(dev, s, new_size);
132 if (retval < 0)
133 return retval;
134 }
135
136 DPRINTK("comedi%i subd %d buffer resized to %i bytes\n",
137 dev->minor, (int)(s - dev->subdevices), async->prealloc_bufsz);
138 return 0;
139}
140
141/* sysfs attribute files */
142
a5011a26
HS		 143static ssize_t show_max_read_buffer_kb(struct device *dev,
144 struct device_attribute *attr, char *buf)
145{
a5011a26 146 struct comedi_device_file_info *info = dev_get_drvdata(dev);
72fd9fac
HS		 147 struct comedi_subdevice *s = comedi_get_read_subdevice(info);
148 unsigned int size = 0;
a5011a26
HS		 149
150 mutex_lock(&info->device->mutex);
72fd9fac
HS		 151 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
152 size = s->async->max_bufsize / 1024;
a5011a26
HS		 153 mutex_unlock(&info->device->mutex);
154
72fd9fac 155 return snprintf(buf, PAGE_SIZE, "%i\n", size);
a5011a26
HS		 156}
157
158static ssize_t store_max_read_buffer_kb(struct device *dev,
159 struct device_attribute *attr,
160 const char *buf, size_t count)
161{
162 struct comedi_device_file_info *info = dev_get_drvdata(dev);
72fd9fac
HS		 163 struct comedi_subdevice *s = comedi_get_read_subdevice(info);
164 unsigned int size;
165 int err;
166
167 err = kstrtouint(buf, 10, &size);
168 if (err)
169 return err;
170 if (size > (UINT_MAX / 1024))
a5011a26 171 return -EINVAL;
72fd9fac 172 size *= 1024;
a5011a26
HS		 173
174 mutex_lock(&info->device->mutex);
72fd9fac
HS		 175 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
176 s->async->max_bufsize = size;
177 else
178 err = -EINVAL;
a5011a26
HS		 179 mutex_unlock(&info->device->mutex);
180
72fd9fac 181 return err ? err : count;
a5011a26
HS		 182}
183
a5011a26
HS		 184static ssize_t show_read_buffer_kb(struct device *dev,
185 struct device_attribute *attr, char *buf)
186{
a5011a26 187 struct comedi_device_file_info *info = dev_get_drvdata(dev);
72fd9fac
HS		 188 struct comedi_subdevice *s = comedi_get_read_subdevice(info);
189 unsigned int size = 0;
a5011a26
HS		 190
191 mutex_lock(&info->device->mutex);
72fd9fac
HS		 192 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
193 size = s->async->prealloc_bufsz / 1024;
a5011a26
HS		 194 mutex_unlock(&info->device->mutex);
195
72fd9fac 196 return snprintf(buf, PAGE_SIZE, "%i\n", size);
a5011a26
HS		 197}
198
199static ssize_t store_read_buffer_kb(struct device *dev,
200 struct device_attribute *attr,
201 const char *buf, size_t count)
202{
203 struct comedi_device_file_info *info = dev_get_drvdata(dev);
72fd9fac
HS		 204 struct comedi_subdevice *s = comedi_get_read_subdevice(info);
205 unsigned int size;
206 int err;
207
208 err = kstrtouint(buf, 10, &size);
209 if (err)
210 return err;
211 if (size > (UINT_MAX / 1024))
a5011a26 212 return -EINVAL;
72fd9fac 213 size *= 1024;
a5011a26
HS		 214
215 mutex_lock(&info->device->mutex);
72fd9fac
HS		 216 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
217 err = resize_async_buffer(info->device, s, s->async, size);
218 else
219 err = -EINVAL;
a5011a26
HS		 220 mutex_unlock(&info->device->mutex);
221
72fd9fac 222 return err ? err : count;
a5011a26 223}
883db3d9 224
a5011a26
HS		 225static ssize_t show_max_write_buffer_kb(struct device *dev,
226 struct device_attribute *attr,
227 char *buf)
228{
a5011a26 229 struct comedi_device_file_info *info = dev_get_drvdata(dev);
72fd9fac
HS		 230 struct comedi_subdevice *s = comedi_get_write_subdevice(info);
231 unsigned int size = 0;
a5011a26
HS		 232
233 mutex_lock(&info->device->mutex);
72fd9fac
HS		 234 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
235 size = s->async->max_bufsize / 1024;
a5011a26
HS		 236 mutex_unlock(&info->device->mutex);
237
72fd9fac 238 return snprintf(buf, PAGE_SIZE, "%i\n", size);
a5011a26
HS		 239}
240
241static ssize_t store_max_write_buffer_kb(struct device *dev,
242 struct device_attribute *attr,
243 const char *buf, size_t count)
244{
245 struct comedi_device_file_info *info = dev_get_drvdata(dev);
72fd9fac
HS		 246 struct comedi_subdevice *s = comedi_get_write_subdevice(info);
247 unsigned int size;
248 int err;
249
250 err = kstrtouint(buf, 10, &size);
251 if (err)
252 return err;
253 if (size > (UINT_MAX / 1024))
a5011a26 254 return -EINVAL;
72fd9fac 255 size *= 1024;
a5011a26
HS		 256
257 mutex_lock(&info->device->mutex);
72fd9fac
HS		 258 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
259 s->async->max_bufsize = size;
260 else
261 err = -EINVAL;
a5011a26
HS		 262 mutex_unlock(&info->device->mutex);
263
72fd9fac 264 return err ? err : count;
a5011a26
HS		 265}
266
a5011a26
HS		 267static ssize_t show_write_buffer_kb(struct device *dev,
268 struct device_attribute *attr, char *buf)
269{
a5011a26 270 struct comedi_device_file_info *info = dev_get_drvdata(dev);
72fd9fac
HS		 271 struct comedi_subdevice *s = comedi_get_write_subdevice(info);
272 unsigned int size = 0;
a5011a26
HS		 273
274 mutex_lock(&info->device->mutex);
72fd9fac
HS		 275 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
276 size = s->async->prealloc_bufsz / 1024;
a5011a26
HS		 277 mutex_unlock(&info->device->mutex);
278
72fd9fac 279 return snprintf(buf, PAGE_SIZE, "%i\n", size);
a5011a26
HS		 280}
281
282static ssize_t store_write_buffer_kb(struct device *dev,
283 struct device_attribute *attr,
284 const char *buf, size_t count)
285{
286 struct comedi_device_file_info *info = dev_get_drvdata(dev);
72fd9fac
HS		 287 struct comedi_subdevice *s = comedi_get_write_subdevice(info);
288 unsigned int size;
289 int err;
290
291 err = kstrtouint(buf, 10, &size);
292 if (err)
293 return err;
294 if (size > (UINT_MAX / 1024))
a5011a26 295 return -EINVAL;
72fd9fac 296 size *= 1024;
a5011a26
HS		 297
298 mutex_lock(&info->device->mutex);
72fd9fac
HS		 299 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
300 err = resize_async_buffer(info->device, s, s->async, size);
301 else
302 err = -EINVAL;
a5011a26
HS		 303 mutex_unlock(&info->device->mutex);
304
72fd9fac 305 return err ? err : count;
a5011a26
HS		 306}
307
fb60367d
HS		 308static struct device_attribute comedi_dev_attrs[] = {
309 __ATTR(max_read_buffer_kb, S_IRUGO | S_IWUSR,
310 show_max_read_buffer_kb, store_max_read_buffer_kb),
311 __ATTR(read_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP,
312 show_read_buffer_kb, store_read_buffer_kb),
313 __ATTR(max_write_buffer_kb, S_IRUGO | S_IWUSR,
314 show_max_write_buffer_kb, store_max_write_buffer_kb),
315 __ATTR(write_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP,
316 show_write_buffer_kb, store_write_buffer_kb),
317 __ATTR_NULL
a5011a26 318};
ed9eccbe 319
ed9eccbe
DS		 320/*
321 COMEDI_DEVCONFIG
322 device config ioctl
323
324 arg:
325 pointer to devconfig structure
326
327 reads:
328 devconfig structure at arg
329
330 writes:
331 none
332*/
0a85b6f0 333static int do_devconfig_ioctl(struct comedi_device *dev,
92d0127c 334 struct comedi_devconfig __user *arg)
ed9eccbe 335{
0707bb04 336 struct comedi_devconfig it;
ed9eccbe
DS		 337 int ret;
338 unsigned char *aux_data = NULL;
339 int aux_len;
340
341 if (!capable(CAP_SYS_ADMIN))
342 return -EPERM;
343
344 if (arg == NULL) {
345 if (is_device_busy(dev))
346 return -EBUSY;
476b8477 347 if (dev->attached) {
ed9eccbe
DS		 348 struct module *driver_module = dev->driver->module;
349 comedi_device_detach(dev);
350 module_put(driver_module);
351 }
352 return 0;
353 }
354
0707bb04 355 if (copy_from_user(&it, arg, sizeof(struct comedi_devconfig)))
ed9eccbe
DS		 356 return -EFAULT;
357
358 it.board_name[COMEDI_NAMELEN - 1] = 0;
359
360 if (comedi_aux_data(it.options, 0) &&
476b8477 361 it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) {
ed9eccbe
DS		 362 int bit_shift;
363 aux_len = it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH];
364 if (aux_len < 0)
365 return -EFAULT;
366
367 aux_data = vmalloc(aux_len);
368 if (!aux_data)
369 return -ENOMEM;
370
371 if (copy_from_user(aux_data,
dc881f29
IA		 372 (unsigned char __user *
373 )comedi_aux_data(it.options, 0), aux_len)) {
ed9eccbe
DS		 374 vfree(aux_data);
375 return -EFAULT;
376 }
377 it.options[COMEDI_DEVCONF_AUX_DATA_LO] =
476b8477 378 (unsigned long)aux_data;
ed9eccbe
DS		 379 if (sizeof(void *) > sizeof(int)) {
380 bit_shift = sizeof(int) * 8;
381 it.options[COMEDI_DEVCONF_AUX_DATA_HI] =
476b8477 382 ((unsigned long)aux_data) >> bit_shift;
ed9eccbe
DS		 383 } else
384 it.options[COMEDI_DEVCONF_AUX_DATA_HI] = 0;
385 }
386
387 ret = comedi_device_attach(dev, &it);
476b8477
GKH		 388 if (ret == 0) {
389 if (!try_module_get(dev->driver->module)) {
ed9eccbe 390 comedi_device_detach(dev);
abae41e6 391 ret = -ENOSYS;
ed9eccbe
DS		 392 }
393 }
394
395 if (aux_data)
396 vfree(aux_data);
397
398 return ret;
399}
400
401/*
402 COMEDI_BUFCONFIG
403 buffer configuration ioctl
404
405 arg:
406 pointer to bufconfig structure
407
408 reads:
409 bufconfig at arg
410
411 writes:
412 modified bufconfig at arg
413
414*/
92d0127c
GKH		 415static int do_bufconfig_ioctl(struct comedi_device *dev,
416 struct comedi_bufconfig __user *arg)
ed9eccbe 417{
be6aba4a 418 struct comedi_bufconfig bc;
d163679c 419 struct comedi_async *async;
34c43922 420 struct comedi_subdevice *s;
883db3d9 421 int retval = 0;
ed9eccbe 422
be6aba4a 423 if (copy_from_user(&bc, arg, sizeof(struct comedi_bufconfig)))
ed9eccbe
DS		 424 return -EFAULT;
425
426 if (bc.subdevice >= dev->n_subdevices || bc.subdevice < 0)
427 return -EINVAL;
428
b077f2cd 429 s = &dev->subdevices[bc.subdevice];
ed9eccbe
DS		 430 async = s->async;
431
432 if (!async) {
433 DPRINTK("subdevice does not have async capability\n");
434 bc.size = 0;
435 bc.maximum_size = 0;
436 goto copyback;
437 }
438
439 if (bc.maximum_size) {
440 if (!capable(CAP_SYS_ADMIN))
441 return -EPERM;
442
443 async->max_bufsize = bc.maximum_size;
444 }
445
446 if (bc.size) {
883db3d9
FMH		 447 retval = resize_async_buffer(dev, s, async, bc.size);
448 if (retval < 0)
449 return retval;
ed9eccbe
DS		 450 }
451
452 bc.size = async->prealloc_bufsz;
453 bc.maximum_size = async->max_bufsize;
454
476b8477 455copyback:
be6aba4a 456 if (copy_to_user(arg, &bc, sizeof(struct comedi_bufconfig)))
ed9eccbe
DS		 457 return -EFAULT;
458
459 return 0;
460}
461
462/*
463 COMEDI_DEVINFO
464 device info ioctl
465
466 arg:
467 pointer to devinfo structure
468
469 reads:
470 none
471
472 writes:
473 devinfo structure
474
475*/
0a85b6f0 476static int do_devinfo_ioctl(struct comedi_device *dev,
92d0127c
GKH		 477 struct comedi_devinfo __user *arg,
478 struct file *file)
ed9eccbe 479{
063db04b 480 struct comedi_devinfo devinfo;
ed9eccbe 481 const unsigned minor = iminor(file->f_dentry->d_inode);
476b8477
GKH		 482 struct comedi_device_file_info *dev_file_info =
483 comedi_get_device_file_info(minor);
34c43922 484 struct comedi_subdevice *read_subdev =
476b8477 485 comedi_get_read_subdevice(dev_file_info);
34c43922 486 struct comedi_subdevice *write_subdev =
476b8477 487 comedi_get_write_subdevice(dev_file_info);
ed9eccbe
DS		 488
489 memset(&devinfo, 0, sizeof(devinfo));
490
491 /* fill devinfo structure */
492 devinfo.version_code = COMEDI_VERSION_CODE;
493 devinfo.n_subdevs = dev->n_subdevices;
819cbb12
VK		 494 strlcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN);
495 strlcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN);
ed9eccbe 496
476b8477 497 if (read_subdev)
ed9eccbe 498 devinfo.read_subdevice = read_subdev - dev->subdevices;
476b8477 499 else
ed9eccbe 500 devinfo.read_subdevice = -1;
476b8477
GKH		 501
502 if (write_subdev)
ed9eccbe 503 devinfo.write_subdevice = write_subdev - dev->subdevices;
476b8477 504 else
ed9eccbe 505 devinfo.write_subdevice = -1;
ed9eccbe 506
063db04b 507 if (copy_to_user(arg, &devinfo, sizeof(struct comedi_devinfo)))
ed9eccbe
DS		 508 return -EFAULT;
509
510 return 0;
511}
512
513/*
514 COMEDI_SUBDINFO
515 subdevice info ioctl
516
517 arg:
518 pointer to array of subdevice info structures
519
520 reads:
521 none
522
523 writes:
524 array of subdevice info structures at arg
525
526*/
0a85b6f0 527static int do_subdinfo_ioctl(struct comedi_device *dev,
92d0127c 528 struct comedi_subdinfo __user *arg, void *file)
ed9eccbe
DS		 529{
530 int ret, i;
bd52efbb 531 struct comedi_subdinfo *tmp, *us;
34c43922 532 struct comedi_subdevice *s;
ed9eccbe 533
0a85b6f0
MT		 534 tmp =
535 kcalloc(dev->n_subdevices, sizeof(struct comedi_subdinfo),
536 GFP_KERNEL);
ed9eccbe
DS		 537 if (!tmp)
538 return -ENOMEM;
539
540 /* fill subdinfo structs */
541 for (i = 0; i < dev->n_subdevices; i++) {
b077f2cd 542 s = &dev->subdevices[i];
ed9eccbe
DS		 543 us = tmp + i;
544
545 us->type = s->type;
546 us->n_chan = s->n_chan;
547 us->subd_flags = s->subdev_flags;
548 if (comedi_get_subdevice_runflags(s) & SRF_RUNNING)
549 us->subd_flags |= SDF_RUNNING;
550#define TIMER_nanosec 5 /* backwards compatibility */
551 us->timer_type = TIMER_nanosec;
552 us->len_chanlist = s->len_chanlist;
553 us->maxdata = s->maxdata;
554 if (s->range_table) {
555 us->range_type =
476b8477 556 (i << 24) | (0 << 16) | (s->range_table->length);
ed9eccbe
DS		 557 } else {
558 us->range_type = 0; /* XXX */
559 }
560 us->flags = s->flags;
561
562 if (s->busy)
563 us->subd_flags |= SDF_BUSY;
564 if (s->busy == file)
565 us->subd_flags |= SDF_BUSY_OWNER;
566 if (s->lock)
567 us->subd_flags |= SDF_LOCKED;
568 if (s->lock == file)
569 us->subd_flags |= SDF_LOCK_OWNER;
570 if (!s->maxdata && s->maxdata_list)
571 us->subd_flags |= SDF_MAXDATA;
572 if (s->flaglist)
573 us->subd_flags |= SDF_FLAGS;
574 if (s->range_table_list)
575 us->subd_flags |= SDF_RANGETYPE;
576 if (s->do_cmd)
577 us->subd_flags |= SDF_CMD;
578
579 if (s->insn_bits != &insn_inval)
580 us->insn_bits_support = COMEDI_SUPPORTED;
581 else
582 us->insn_bits_support = COMEDI_UNSUPPORTED;
583
584 us->settling_time_0 = s->settling_time_0;
585 }
586
587 ret = copy_to_user(arg, tmp,
bd52efbb 588 dev->n_subdevices * sizeof(struct comedi_subdinfo));
ed9eccbe
DS		 589
590 kfree(tmp);
591
592 return ret ? -EFAULT : 0;
593}
594
595/*
596 COMEDI_CHANINFO
597 subdevice info ioctl
598
599 arg:
600 pointer to chaninfo structure
601
602 reads:
603 chaninfo structure at arg
604
605 writes:
606 arrays at elements of chaninfo structure
607
608*/
0a85b6f0 609static int do_chaninfo_ioctl(struct comedi_device *dev,
92d0127c 610 struct comedi_chaninfo __user *arg)
ed9eccbe 611{
34c43922 612 struct comedi_subdevice *s;
a18b416d 613 struct comedi_chaninfo it;
ed9eccbe 614
a18b416d 615 if (copy_from_user(&it, arg, sizeof(struct comedi_chaninfo)))
ed9eccbe
DS		 616 return -EFAULT;
617
618 if (it.subdev >= dev->n_subdevices)
619 return -EINVAL;
b077f2cd 620 s = &dev->subdevices[it.subdev];
ed9eccbe
DS		 621
622 if (it.maxdata_list) {
623 if (s->maxdata || !s->maxdata_list)
624 return -EINVAL;
625 if (copy_to_user(it.maxdata_list, s->maxdata_list,
790c5541 626 s->n_chan * sizeof(unsigned int)))
ed9eccbe
DS		 627 return -EFAULT;
628 }
629
630 if (it.flaglist) {
631 if (!s->flaglist)
632 return -EINVAL;
633 if (copy_to_user(it.flaglist, s->flaglist,
476b8477 634 s->n_chan * sizeof(unsigned int)))
ed9eccbe
DS		 635 return -EFAULT;
636 }
637
638 if (it.rangelist) {
639 int i;
640
641 if (!s->range_table_list)
642 return -EINVAL;
643 for (i = 0; i < s->n_chan; i++) {
644 int x;
645
646 x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) |
476b8477 647 (s->range_table_list[i]->length);
81604d43
VK		 648 if (put_user(x, it.rangelist + i))
649 return -EFAULT;
ed9eccbe 650 }
476b8477
GKH		 651#if 0
652 if (copy_to_user(it.rangelist, s->range_type_list,
0a85b6f0 653 s->n_chan * sizeof(unsigned int)))
476b8477
GKH		 654 return -EFAULT;
655#endif
ed9eccbe
DS		 656 }
657
658 return 0;
659}
660
661 /*
662 COMEDI_BUFINFO
663 buffer information ioctl
664
665 arg:
666 pointer to bufinfo structure
667
668 reads:
669 bufinfo at arg
670
671 writes:
672 modified bufinfo at arg
673
674 */
92d0127c 675static int do_bufinfo_ioctl(struct comedi_device *dev,
53fa827e 676 struct comedi_bufinfo __user *arg, void *file)
ed9eccbe 677{
9aa5339a 678 struct comedi_bufinfo bi;
34c43922 679 struct comedi_subdevice *s;
d163679c 680 struct comedi_async *async;
ed9eccbe 681
9aa5339a 682 if (copy_from_user(&bi, arg, sizeof(struct comedi_bufinfo)))
ed9eccbe
DS		 683 return -EFAULT;
684
685 if (bi.subdevice >= dev->n_subdevices || bi.subdevice < 0)
686 return -EINVAL;
687
b077f2cd 688 s = &dev->subdevices[bi.subdevice];
53fa827e
IA		 689
690 if (s->lock && s->lock != file)
691 return -EACCES;
692
ed9eccbe
DS		 693 async = s->async;
694
695 if (!async) {
696 DPRINTK("subdevice does not have async capability\n");
697 bi.buf_write_ptr = 0;
698 bi.buf_read_ptr = 0;
699 bi.buf_write_count = 0;
700 bi.buf_read_count = 0;
4772c018
IA		 701 bi.bytes_read = 0;
702 bi.bytes_written = 0;
ed9eccbe
DS		 703 goto copyback;
704 }
53fa827e
IA		 705 if (!s->busy) {
706 bi.bytes_read = 0;
707 bi.bytes_written = 0;
708 goto copyback_position;
709 }
710 if (s->busy != file)
711 return -EACCES;
ed9eccbe
DS		 712
713 if (bi.bytes_read && (s->subdev_flags & SDF_CMD_READ)) {
714 bi.bytes_read = comedi_buf_read_alloc(async, bi.bytes_read);
715 comedi_buf_read_free(async, bi.bytes_read);
716
717 if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR |
476b8477
GKH		 718 SRF_RUNNING))
719 && async->buf_write_count == async->buf_read_count) {
ed9eccbe
DS		 720 do_become_nonbusy(dev, s);
721 }
722 }
723
724 if (bi.bytes_written && (s->subdev_flags & SDF_CMD_WRITE)) {
725 bi.bytes_written =
476b8477 726 comedi_buf_write_alloc(async, bi.bytes_written);
ed9eccbe
DS		 727 comedi_buf_write_free(async, bi.bytes_written);
728 }
729
53fa827e 730copyback_position:
ed9eccbe
DS		 731 bi.buf_write_count = async->buf_write_count;
732 bi.buf_write_ptr = async->buf_write_ptr;
733 bi.buf_read_count = async->buf_read_count;
734 bi.buf_read_ptr = async->buf_read_ptr;
735
476b8477 736copyback:
9aa5339a 737 if (copy_to_user(arg, &bi, sizeof(struct comedi_bufinfo)))
ed9eccbe
DS		 738 return -EFAULT;
739
740 return 0;
741}
742
0a85b6f0
MT		 743static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn,
744 unsigned int *data, void *file);
ed9eccbe 745/*
20617f22
PDP		 746 * COMEDI_INSNLIST
747 * synchronous instructions
ed9eccbe 748 *
20617f22
PDP		 749 * arg:
750 * pointer to sync cmd structure
ed9eccbe 751 *
20617f22
PDP		 752 * reads:
753 * sync cmd struct at arg
754 * instruction list
755 * data (for writes)
ed9eccbe 756 *
20617f22
PDP		 757 * writes:
758 * data (for reads)
ed9eccbe
DS		 759 */
760/* arbitrary limits */
761#define MAX_SAMPLES 256
92d0127c
GKH		 762static int do_insnlist_ioctl(struct comedi_device *dev,
763 struct comedi_insnlist __user *arg, void *file)
ed9eccbe 764{
da613f4f 765 struct comedi_insnlist insnlist;
90035c08 766 struct comedi_insn *insns = NULL;
790c5541 767 unsigned int *data = NULL;
ed9eccbe
DS		 768 int i = 0;
769 int ret = 0;
770
da613f4f 771 if (copy_from_user(&insnlist, arg, sizeof(struct comedi_insnlist)))
ed9eccbe
DS		 772 return -EFAULT;
773
790c5541 774 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL);
ed9eccbe
DS		 775 if (!data) {
776 DPRINTK("kmalloc failed\n");
777 ret = -ENOMEM;
778 goto error;
779 }
780
0a85b6f0 781 insns =
dfd8ee92 782 kcalloc(insnlist.n_insns, sizeof(struct comedi_insn), GFP_KERNEL);
ed9eccbe
DS		 783 if (!insns) {
784 DPRINTK("kmalloc failed\n");
785 ret = -ENOMEM;
786 goto error;
787 }
788
789 if (copy_from_user(insns, insnlist.insns,
90035c08 790 sizeof(struct comedi_insn) * insnlist.n_insns)) {
ed9eccbe
DS		 791 DPRINTK("copy_from_user failed\n");
792 ret = -EFAULT;
793 goto error;
794 }
795
796 for (i = 0; i < insnlist.n_insns; i++) {
797 if (insns[i].n > MAX_SAMPLES) {
798 DPRINTK("number of samples too large\n");
799 ret = -EINVAL;
800 goto error;
801 }
802 if (insns[i].insn & INSN_MASK_WRITE) {
803 if (copy_from_user(data, insns[i].data,
790c5541 804 insns[i].n * sizeof(unsigned int))) {
ed9eccbe
DS		 805 DPRINTK("copy_from_user failed\n");
806 ret = -EFAULT;
807 goto error;
808 }
809 }
810 ret = parse_insn(dev, insns + i, data, file);
811 if (ret < 0)
812 goto error;
813 if (insns[i].insn & INSN_MASK_READ) {
814 if (copy_to_user(insns[i].data, data,
790c5541 815 insns[i].n * sizeof(unsigned int))) {
ed9eccbe
DS		 816 DPRINTK("copy_to_user failed\n");
817 ret = -EFAULT;
818 goto error;
819 }
820 }
821 if (need_resched())
822 schedule();
823 }
824
476b8477
GKH		 825error:
826 kfree(insns);
827 kfree(data);
ed9eccbe
DS		 828
829 if (ret < 0)
830 return ret;
831 return i;
832}
833
0a85b6f0
MT		 834static int check_insn_config_length(struct comedi_insn *insn,
835 unsigned int *data)
ed9eccbe 836{
476b8477
GKH		 837 if (insn->n < 1)
838 return -EINVAL;
ed9eccbe
DS		 839
840 switch (data[0]) {
841 case INSN_CONFIG_DIO_OUTPUT:
842 case INSN_CONFIG_DIO_INPUT:
843 case INSN_CONFIG_DISARM:
844 case INSN_CONFIG_RESET:
845 if (insn->n == 1)
846 return 0;
847 break;
848 case INSN_CONFIG_ARM:
849 case INSN_CONFIG_DIO_QUERY:
850 case INSN_CONFIG_BLOCK_SIZE:
851 case INSN_CONFIG_FILTER:
852 case INSN_CONFIG_SERIAL_CLOCK:
853 case INSN_CONFIG_BIDIRECTIONAL_DATA:
854 case INSN_CONFIG_ALT_SOURCE:
855 case INSN_CONFIG_SET_COUNTER_MODE:
856 case INSN_CONFIG_8254_READ_STATUS:
857 case INSN_CONFIG_SET_ROUTING:
858 case INSN_CONFIG_GET_ROUTING:
859 case INSN_CONFIG_GET_PWM_STATUS:
860 case INSN_CONFIG_PWM_SET_PERIOD:
861 case INSN_CONFIG_PWM_GET_PERIOD:
862 if (insn->n == 2)
863 return 0;
864 break;
865 case INSN_CONFIG_SET_GATE_SRC:
866 case INSN_CONFIG_GET_GATE_SRC:
867 case INSN_CONFIG_SET_CLOCK_SRC:
868 case INSN_CONFIG_GET_CLOCK_SRC:
869 case INSN_CONFIG_SET_OTHER_SRC:
870 case INSN_CONFIG_GET_COUNTER_STATUS:
871 case INSN_CONFIG_PWM_SET_H_BRIDGE:
872 case INSN_CONFIG_PWM_GET_H_BRIDGE:
873 case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE:
874 if (insn->n == 3)
875 return 0;
876 break;
877 case INSN_CONFIG_PWM_OUTPUT:
878 case INSN_CONFIG_ANALOG_TRIG:
879 if (insn->n == 5)
880 return 0;
881 break;
b0a2b6d8
IA		 882 case INSN_CONFIG_DIGITAL_TRIG:
883 if (insn->n == 6)
884 return 0;
885 break;
0a85b6f0
MT		 886 /* by default we allow the insn since we don't have checks for
887 * all possible cases yet */
ed9eccbe 888 default:
4f870fe6
IA		 889 pr_warn("comedi: No check for data length of config insn id %i is implemented.\n",
890 data[0]);
891 pr_warn("comedi: Add a check to %s in %s.\n",
892 __func__, __FILE__);
893 pr_warn("comedi: Assuming n=%i is correct.\n", insn->n);
ed9eccbe 894 return 0;
ed9eccbe
DS		 895 }
896 return -EINVAL;
897}
898
0a85b6f0
MT		 899static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn,
900 unsigned int *data, void *file)
ed9eccbe 901{
34c43922 902 struct comedi_subdevice *s;
ed9eccbe
DS		 903 int ret = 0;
904 int i;
905
906 if (insn->insn & INSN_MASK_SPECIAL) {
907 /* a non-subdevice instruction */
908
909 switch (insn->insn) {
910 case INSN_GTOD:
911 {
912 struct timeval tv;
913
914 if (insn->n != 2) {
915 ret = -EINVAL;
916 break;
917 }
918
919 do_gettimeofday(&tv);
920 data[0] = tv.tv_sec;
921 data[1] = tv.tv_usec;
922 ret = 2;
923
924 break;
925 }
926 case INSN_WAIT:
927 if (insn->n != 1 || data[0] >= 100000) {
928 ret = -EINVAL;
929 break;
930 }
931 udelay(data[0] / 1000);
932 ret = 1;
933 break;
934 case INSN_INTTRIG:
935 if (insn->n != 1) {
936 ret = -EINVAL;
937 break;
938 }
939 if (insn->subdev >= dev->n_subdevices) {
940 DPRINTK("%d not usable subdevice\n",
941 insn->subdev);
942 ret = -EINVAL;
943 break;
944 }
b077f2cd 945 s = &dev->subdevices[insn->subdev];
ed9eccbe
DS		 946 if (!s->async) {
947 DPRINTK("no async\n");
948 ret = -EINVAL;
949 break;
950 }
951 if (!s->async->inttrig) {
952 DPRINTK("no inttrig\n");
953 ret = -EAGAIN;
954 break;
955 }
5d06e3df 956 ret = s->async->inttrig(dev, s, data[0]);
ed9eccbe
DS		 957 if (ret >= 0)
958 ret = 1;
959 break;
960 default:
961 DPRINTK("invalid insn\n");
962 ret = -EINVAL;
963 break;
964 }
965 } else {
966 /* a subdevice instruction */
790c5541 967 unsigned int maxdata;
ed9eccbe
DS		 968
969 if (insn->subdev >= dev->n_subdevices) {
970 DPRINTK("subdevice %d out of range\n", insn->subdev);
971 ret = -EINVAL;
972 goto out;
973 }
b077f2cd 974 s = &dev->subdevices[insn->subdev];
ed9eccbe
DS		 975
976 if (s->type == COMEDI_SUBD_UNUSED) {
977 DPRINTK("%d not usable subdevice\n", insn->subdev);
978 ret = -EIO;
979 goto out;
980 }
981
982 /* are we locked? (ioctl lock) */
983 if (s->lock && s->lock != file) {
984 DPRINTK("device locked\n");
985 ret = -EACCES;
986 goto out;
987 }
988
0fd0ca75 989 ret = comedi_check_chanlist(s, 1, &insn->chanspec);
476b8477 990 if (ret < 0) {
ed9eccbe
DS		 991 ret = -EINVAL;
992 DPRINTK("bad chanspec\n");
993 goto out;
994 }
995
996 if (s->busy) {
997 ret = -EBUSY;
998 goto out;
999 }
1000 /* This looks arbitrary. It is. */
1001 s->busy = &parse_insn;
1002 switch (insn->insn) {
1003 case INSN_READ:
1004 ret = s->insn_read(dev, s, insn, data);
1005 break;
1006 case INSN_WRITE:
1007 maxdata = s->maxdata_list
476b8477
GKH		 1008 ? s->maxdata_list[CR_CHAN(insn->chanspec)]
1009 : s->maxdata;
ed9eccbe
DS		 1010 for (i = 0; i < insn->n; ++i) {
1011 if (data[i] > maxdata) {
1012 ret = -EINVAL;
1013 DPRINTK("bad data value(s)\n");
1014 break;
1015 }
1016 }
1017 if (ret == 0)
1018 ret = s->insn_write(dev, s, insn, data);
1019 break;
1020 case INSN_BITS:
1021 if (insn->n != 2) {
1022 ret = -EINVAL;
2f644ccf
IA		 1023 } else {
1024 /* Most drivers ignore the base channel in
1025 * insn->chanspec. Fix this here if
1026 * the subdevice has <= 32 channels. */
1027 unsigned int shift;
1028 unsigned int orig_mask;
1029
1030 orig_mask = data[0];
1031 if (s->n_chan <= 32) {
1032 shift = CR_CHAN(insn->chanspec);
1033 if (shift > 0) {
1034 insn->chanspec = 0;
1035 data[0] <<= shift;
1036 data[1] <<= shift;
1037 }
1038 } else
1039 shift = 0;
1040 ret = s->insn_bits(dev, s, insn, data);
1041 data[0] = orig_mask;
1042 if (shift > 0)
1043 data[1] >>= shift;
ed9eccbe 1044 }
ed9eccbe
DS		 1045 break;
1046 case INSN_CONFIG:
1047 ret = check_insn_config_length(insn, data);
1048 if (ret)
1049 break;
1050 ret = s->insn_config(dev, s, insn, data);
1051 break;
1052 default:
1053 ret = -EINVAL;
1054 break;
1055 }
1056
1057 s->busy = NULL;
1058 }
1059
476b8477 1060out:
ed9eccbe
DS		 1061 return ret;
1062}
1063
1064/*
20617f22
PDP		 1065 * COMEDI_INSN
1066 * synchronous instructions
ed9eccbe 1067 *
20617f22
PDP		 1068 * arg:
1069 * pointer to insn
ed9eccbe 1070 *
20617f22
PDP		 1071 * reads:
1072 * struct comedi_insn struct at arg
1073 * data (for writes)
ed9eccbe 1074 *
20617f22
PDP		 1075 * writes:
1076 * data (for reads)
ed9eccbe 1077 */
92d0127c
GKH		 1078static int do_insn_ioctl(struct comedi_device *dev,
1079 struct comedi_insn __user *arg, void *file)
ed9eccbe 1080{
90035c08 1081 struct comedi_insn insn;
790c5541 1082 unsigned int *data = NULL;
ed9eccbe
DS		 1083 int ret = 0;
1084
790c5541 1085 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL);
ed9eccbe
DS		 1086 if (!data) {
1087 ret = -ENOMEM;
1088 goto error;
1089 }
1090
90035c08 1091 if (copy_from_user(&insn, arg, sizeof(struct comedi_insn))) {
ed9eccbe
DS		 1092 ret = -EFAULT;
1093 goto error;
1094 }
1095
1096 /* This is where the behavior of insn and insnlist deviate. */
1097 if (insn.n > MAX_SAMPLES)
1098 insn.n = MAX_SAMPLES;
1099 if (insn.insn & INSN_MASK_WRITE) {
21fe2eea
M		 1100 if (copy_from_user(data,
1101 insn.data,
1102 insn.n * sizeof(unsigned int))) {
ed9eccbe
DS		 1103 ret = -EFAULT;
1104 goto error;
1105 }
1106 }
1107 ret = parse_insn(dev, &insn, data, file);
1108 if (ret < 0)
1109 goto error;
1110 if (insn.insn & INSN_MASK_READ) {
21fe2eea
M		 1111 if (copy_to_user(insn.data,
1112 data,
1113 insn.n * sizeof(unsigned int))) {
ed9eccbe
DS		 1114 ret = -EFAULT;
1115 goto error;
1116 }
1117 }
1118 ret = insn.n;
1119
476b8477
GKH		 1120error:
1121 kfree(data);
ed9eccbe
DS		 1122
1123 return ret;
1124}
1125
181bd67b
GKH		 1126static void comedi_set_subdevice_runflags(struct comedi_subdevice *s,
1127 unsigned mask, unsigned bits)
1128{
1129 unsigned long flags;
1130
1131 spin_lock_irqsave(&s->spin_lock, flags);
1132 s->runflags &= ~mask;
1133 s->runflags |= (bits & mask);
1134 spin_unlock_irqrestore(&s->spin_lock, flags);
1135}
1136
92d0127c 1137static int do_cmd_ioctl(struct comedi_device *dev,
cbe01f72 1138 struct comedi_cmd __user *arg, void *file)
ed9eccbe 1139{
88bc0574 1140 struct comedi_cmd cmd;
34c43922 1141 struct comedi_subdevice *s;
d163679c 1142 struct comedi_async *async;
ed9eccbe 1143 int ret = 0;
95bc359f 1144 unsigned int __user *user_chanlist;
ed9eccbe 1145
88bc0574 1146 if (copy_from_user(&cmd, arg, sizeof(struct comedi_cmd))) {
ed9eccbe
DS		 1147 DPRINTK("bad cmd address\n");
1148 return -EFAULT;
1149 }
476b8477 1150 /* save user's chanlist pointer so it can be restored later */
95bc359f 1151 user_chanlist = (unsigned int __user *)cmd.chanlist;
ed9eccbe 1152
88bc0574
HS		 1153 if (cmd.subdev >= dev->n_subdevices) {
1154 DPRINTK("%d no such subdevice\n", cmd.subdev);
ed9eccbe
DS		 1155 return -ENODEV;
1156 }
1157
88bc0574 1158 s = &dev->subdevices[cmd.subdev];
ed9eccbe
DS		 1159 async = s->async;
1160
1161 if (s->type == COMEDI_SUBD_UNUSED) {
88bc0574 1162 DPRINTK("%d not valid subdevice\n", cmd.subdev);
ed9eccbe
DS		 1163 return -EIO;
1164 }
1165
1166 if (!s->do_cmd || !s->do_cmdtest || !s->async) {
1167 DPRINTK("subdevice %i does not support commands\n",
88bc0574 1168 cmd.subdev);
ed9eccbe
DS		 1169 return -EIO;
1170 }
1171
1172 /* are we locked? (ioctl lock) */
1173 if (s->lock && s->lock != file) {
1174 DPRINTK("subdevice locked\n");
1175 return -EACCES;
1176 }
1177
1178 /* are we busy? */
1179 if (s->busy) {
1180 DPRINTK("subdevice busy\n");
1181 return -EBUSY;
1182 }
1183 s->busy = file;
1184
1185 /* make sure channel/gain list isn't too long */
88bc0574 1186 if (cmd.chanlist_len > s->len_chanlist) {
ed9eccbe 1187 DPRINTK("channel/gain list too long %u > %d\n",
88bc0574 1188 cmd.chanlist_len, s->len_chanlist);
ed9eccbe
DS		 1189 ret = -EINVAL;
1190 goto cleanup;
1191 }
1192
1193 /* make sure channel/gain list isn't too short */
88bc0574 1194 if (cmd.chanlist_len < 1) {
ed9eccbe 1195 DPRINTK("channel/gain list too short %u < 1\n",
88bc0574 1196 cmd.chanlist_len);
ed9eccbe
DS		 1197 ret = -EINVAL;
1198 goto cleanup;
1199 }
1200
88bc0574 1201 async->cmd = cmd;
ed9eccbe
DS		 1202 async->cmd.data = NULL;
1203 /* load channel/gain list */
1204 async->cmd.chanlist =
476b8477 1205 kmalloc(async->cmd.chanlist_len * sizeof(int), GFP_KERNEL);
ed9eccbe
DS		 1206 if (!async->cmd.chanlist) {
1207 DPRINTK("allocation failed\n");
1208 ret = -ENOMEM;
1209 goto cleanup;
1210 }
1211
95bc359f 1212 if (copy_from_user(async->cmd.chanlist, user_chanlist,
476b8477 1213 async->cmd.chanlist_len * sizeof(int))) {
ed9eccbe
DS		 1214 DPRINTK("fault reading chanlist\n");
1215 ret = -EFAULT;
1216 goto cleanup;
1217 }
1218
1219 /* make sure each element in channel/gain list is valid */
21fe2eea
M		 1220 ret = comedi_check_chanlist(s,
1221 async->cmd.chanlist_len,
1222 async->cmd.chanlist);
476b8477 1223 if (ret < 0) {
ed9eccbe
DS		 1224 DPRINTK("bad chanlist\n");
1225 goto cleanup;
1226 }
1227
1228 ret = s->do_cmdtest(dev, s, &async->cmd);
1229
1230 if (async->cmd.flags & TRIG_BOGUS || ret) {
1231 DPRINTK("test returned %d\n", ret);
88bc0574 1232 cmd = async->cmd;
476b8477 1233 /* restore chanlist pointer before copying back */
95bc359f 1234 cmd.chanlist = (unsigned int __force *)user_chanlist;
88bc0574
HS		 1235 cmd.data = NULL;
1236 if (copy_to_user(arg, &cmd, sizeof(struct comedi_cmd))) {
ed9eccbe
DS		 1237 DPRINTK("fault writing cmd\n");
1238 ret = -EFAULT;
1239 goto cleanup;
1240 }
1241 ret = -EAGAIN;
1242 goto cleanup;
1243 }
1244
1245 if (!async->prealloc_bufsz) {
1246 ret = -ENOMEM;
1247 DPRINTK("no buffer (?)\n");
1248 goto cleanup;
1249 }
1250
1251 comedi_reset_async_buf(async);
1252
1253 async->cb_mask =
476b8477
GKH		 1254 COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR |
1255 COMEDI_CB_OVERFLOW;
1256 if (async->cmd.flags & TRIG_WAKE_EOS)
ed9eccbe 1257 async->cb_mask |= COMEDI_CB_EOS;
ed9eccbe
DS		 1258
1259 comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING);
1260
ed9eccbe
DS		 1261 ret = s->do_cmd(dev, s);
1262 if (ret == 0)
1263 return 0;
1264
476b8477 1265cleanup:
ed9eccbe
DS		 1266 do_become_nonbusy(dev, s);
1267
1268 return ret;
1269}
1270
1271/*
1272 COMEDI_CMDTEST
1273 command testing ioctl
1274
1275 arg:
1276 pointer to cmd structure
1277
1278 reads:
1279 cmd structure at arg
1280 channel/range list
1281
1282 writes:
1283 modified cmd structure at arg
1284
1285*/
92d0127c
GKH		 1286static int do_cmdtest_ioctl(struct comedi_device *dev,
1287 struct comedi_cmd __user *arg, void *file)
ed9eccbe 1288{
f8348677 1289 struct comedi_cmd cmd;
34c43922 1290 struct comedi_subdevice *s;
ed9eccbe
DS		 1291 int ret = 0;
1292 unsigned int *chanlist = NULL;
95bc359f 1293 unsigned int __user *user_chanlist;
ed9eccbe 1294
f8348677 1295 if (copy_from_user(&cmd, arg, sizeof(struct comedi_cmd))) {
ed9eccbe
DS		 1296 DPRINTK("bad cmd address\n");
1297 return -EFAULT;
1298 }
476b8477 1299 /* save user's chanlist pointer so it can be restored later */
95bc359f 1300 user_chanlist = (unsigned int __user *)cmd.chanlist;
ed9eccbe 1301
f8348677
HS		 1302 if (cmd.subdev >= dev->n_subdevices) {
1303 DPRINTK("%d no such subdevice\n", cmd.subdev);
ed9eccbe
DS		 1304 return -ENODEV;
1305 }
1306
f8348677 1307 s = &dev->subdevices[cmd.subdev];
ed9eccbe 1308 if (s->type == COMEDI_SUBD_UNUSED) {
f8348677 1309 DPRINTK("%d not valid subdevice\n", cmd.subdev);
ed9eccbe
DS		 1310 return -EIO;
1311 }
1312
1313 if (!s->do_cmd || !s->do_cmdtest) {
1314 DPRINTK("subdevice %i does not support commands\n",
f8348677 1315 cmd.subdev);
ed9eccbe
DS		 1316 return -EIO;
1317 }
1318
1319 /* make sure channel/gain list isn't too long */
f8348677 1320 if (cmd.chanlist_len > s->len_chanlist) {
ed9eccbe 1321 DPRINTK("channel/gain list too long %d > %d\n",
f8348677 1322 cmd.chanlist_len, s->len_chanlist);
ed9eccbe
DS		 1323 ret = -EINVAL;
1324 goto cleanup;
1325 }
1326
1327 /* load channel/gain list */
f8348677 1328 if (cmd.chanlist) {
ed9eccbe 1329 chanlist =
f8348677 1330 kmalloc(cmd.chanlist_len * sizeof(int), GFP_KERNEL);
ed9eccbe
DS		 1331 if (!chanlist) {
1332 DPRINTK("allocation failed\n");
1333 ret = -ENOMEM;
1334 goto cleanup;
1335 }
1336
95bc359f 1337 if (copy_from_user(chanlist, user_chanlist,
f8348677 1338 cmd.chanlist_len * sizeof(int))) {
ed9eccbe
DS		 1339 DPRINTK("fault reading chanlist\n");
1340 ret = -EFAULT;
1341 goto cleanup;
1342 }
1343
1344 /* make sure each element in channel/gain list is valid */
f8348677 1345 ret = comedi_check_chanlist(s, cmd.chanlist_len, chanlist);
476b8477 1346 if (ret < 0) {
ed9eccbe
DS		 1347 DPRINTK("bad chanlist\n");
1348 goto cleanup;
1349 }
1350
f8348677 1351 cmd.chanlist = chanlist;
ed9eccbe
DS		 1352 }
1353
f8348677 1354 ret = s->do_cmdtest(dev, s, &cmd);
ed9eccbe 1355
476b8477 1356 /* restore chanlist pointer before copying back */
95bc359f 1357 cmd.chanlist = (unsigned int __force *)user_chanlist;
ed9eccbe 1358
f8348677 1359 if (copy_to_user(arg, &cmd, sizeof(struct comedi_cmd))) {
ed9eccbe
DS		 1360 DPRINTK("bad cmd address\n");
1361 ret = -EFAULT;
1362 goto cleanup;
1363 }
476b8477
GKH		 1364cleanup:
1365 kfree(chanlist);
ed9eccbe
DS		 1366
1367 return ret;
1368}
1369
1370/*
1371 COMEDI_LOCK
1372 lock subdevice
1373
1374 arg:
1375 subdevice number
1376
1377 reads:
1378 none
1379
1380 writes:
1381 none
1382
1383*/
1384
0a85b6f0
MT		 1385static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg,
1386 void *file)
ed9eccbe
DS		 1387{
1388 int ret = 0;
1389 unsigned long flags;
34c43922 1390 struct comedi_subdevice *s;
ed9eccbe
DS		 1391
1392 if (arg >= dev->n_subdevices)
1393 return -EINVAL;
b077f2cd 1394 s = &dev->subdevices[arg];
ed9eccbe 1395
5f74ea14 1396 spin_lock_irqsave(&s->spin_lock, flags);
476b8477 1397 if (s->busy || s->lock)
ed9eccbe 1398 ret = -EBUSY;
476b8477 1399 else
ed9eccbe 1400 s->lock = file;
5f74ea14 1401 spin_unlock_irqrestore(&s->spin_lock, flags);
ed9eccbe 1402
c5274ab0 1403#if 0
ed9eccbe
DS		 1404 if (ret < 0)
1405 return ret;
1406
ed9eccbe
DS		 1407 if (s->lock_f)
1408 ret = s->lock_f(dev, s);
1409#endif
1410
1411 return ret;
1412}
1413
1414/*
1415 COMEDI_UNLOCK
1416 unlock subdevice
1417
1418 arg:
1419 subdevice number
1420
1421 reads:
1422 none
1423
1424 writes:
1425 none
1426
1427 This function isn't protected by the semaphore, since
1428 we already own the lock.
1429*/
0a85b6f0
MT		 1430static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg,
1431 void *file)
ed9eccbe 1432{
34c43922 1433 struct comedi_subdevice *s;
ed9eccbe
DS		 1434
1435 if (arg >= dev->n_subdevices)
1436 return -EINVAL;
b077f2cd 1437 s = &dev->subdevices[arg];
ed9eccbe
DS		 1438
1439 if (s->busy)
1440 return -EBUSY;
1441
1442 if (s->lock && s->lock != file)
1443 return -EACCES;
1444
1445 if (s->lock == file) {
1446#if 0
1447 if (s->unlock)
1448 s->unlock(dev, s);
1449#endif
1450
1451 s->lock = NULL;
1452 }
1453
1454 return 0;
1455}
1456
1457/*
1458 COMEDI_CANCEL
1459 cancel acquisition ioctl
1460
1461 arg:
1462 subdevice number
1463
1464 reads:
1465 nothing
1466
1467 writes:
1468 nothing
1469
1470*/
0a85b6f0
MT		 1471static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg,
1472 void *file)
ed9eccbe 1473{
34c43922 1474 struct comedi_subdevice *s;
ed9eccbe
DS		 1475
1476 if (arg >= dev->n_subdevices)
1477 return -EINVAL;
b077f2cd 1478 s = &dev->subdevices[arg];
ed9eccbe
DS		 1479 if (s->async == NULL)
1480 return -EINVAL;
1481
1482 if (s->lock && s->lock != file)
1483 return -EACCES;
1484
1485 if (!s->busy)
1486 return 0;
1487
1488 if (s->busy != file)
1489 return -EBUSY;
1490
1491 return do_cancel(dev, s);
1492}
1493
1494/*
1495 COMEDI_POLL ioctl
1496 instructs driver to synchronize buffers
1497
1498 arg:
1499 subdevice number
1500
1501 reads:
1502 nothing
1503
1504 writes:
1505 nothing
1506
1507*/
0a85b6f0
MT		 1508static int do_poll_ioctl(struct comedi_device *dev, unsigned int arg,
1509 void *file)
ed9eccbe 1510{
34c43922 1511 struct comedi_subdevice *s;
ed9eccbe
DS		 1512
1513 if (arg >= dev->n_subdevices)
1514 return -EINVAL;
b077f2cd 1515 s = &dev->subdevices[arg];
ed9eccbe
DS		 1516
1517 if (s->lock && s->lock != file)
1518 return -EACCES;
1519
1520 if (!s->busy)
1521 return 0;
1522
1523 if (s->busy != file)
1524 return -EBUSY;
1525
1526 if (s->poll)
1527 return s->poll(dev, s);
1528
1529 return -EINVAL;
1530}
1531
47db6d58
HS		 1532static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd,
1533 unsigned long arg)
1534{
1535 const unsigned minor = iminor(file->f_dentry->d_inode);
1536 struct comedi_device_file_info *dev_file_info =
1537 comedi_get_device_file_info(minor);
1538 struct comedi_device *dev;
1539 int rc;
1540
1541 if (dev_file_info == NULL || dev_file_info->device == NULL)
1542 return -ENODEV;
1543 dev = dev_file_info->device;
1544
1545 mutex_lock(&dev->mutex);
1546
1547 /* Device config is special, because it must work on
1548 * an unconfigured device. */
1549 if (cmd == COMEDI_DEVCONFIG) {
1550 rc = do_devconfig_ioctl(dev,
1551 (struct comedi_devconfig __user *)arg);
1552 goto done;
1553 }
1554
1555 if (!dev->attached) {
1556 DPRINTK("no driver configured on /dev/comedi%i\n", dev->minor);
1557 rc = -ENODEV;
1558 goto done;
1559 }
1560
1561 switch (cmd) {
1562 case COMEDI_BUFCONFIG:
1563 rc = do_bufconfig_ioctl(dev,
1564 (struct comedi_bufconfig __user *)arg);
1565 break;
1566 case COMEDI_DEVINFO:
1567 rc = do_devinfo_ioctl(dev, (struct comedi_devinfo __user *)arg,
1568 file);
1569 break;
1570 case COMEDI_SUBDINFO:
1571 rc = do_subdinfo_ioctl(dev,
1572 (struct comedi_subdinfo __user *)arg,
1573 file);
1574 break;
1575 case COMEDI_CHANINFO:
1576 rc = do_chaninfo_ioctl(dev, (void __user *)arg);
1577 break;
1578 case COMEDI_RANGEINFO:
1579 rc = do_rangeinfo_ioctl(dev, (void __user *)arg);
1580 break;
1581 case COMEDI_BUFINFO:
1582 rc = do_bufinfo_ioctl(dev,
1583 (struct comedi_bufinfo __user *)arg,
1584 file);
1585 break;
1586 case COMEDI_LOCK:
1587 rc = do_lock_ioctl(dev, arg, file);
1588 break;
1589 case COMEDI_UNLOCK:
1590 rc = do_unlock_ioctl(dev, arg, file);
1591 break;
1592 case COMEDI_CANCEL:
1593 rc = do_cancel_ioctl(dev, arg, file);
1594 break;
1595 case COMEDI_CMD:
1596 rc = do_cmd_ioctl(dev, (struct comedi_cmd __user *)arg, file);
1597 break;
1598 case COMEDI_CMDTEST:
1599 rc = do_cmdtest_ioctl(dev, (struct comedi_cmd __user *)arg,
1600 file);
1601 break;
1602 case COMEDI_INSNLIST:
1603 rc = do_insnlist_ioctl(dev,
1604 (struct comedi_insnlist __user *)arg,
1605 file);
1606 break;
1607 case COMEDI_INSN:
1608 rc = do_insn_ioctl(dev, (struct comedi_insn __user *)arg,
1609 file);
1610 break;
1611 case COMEDI_POLL:
1612 rc = do_poll_ioctl(dev, arg, file);
1613 break;
1614 default:
1615 rc = -ENOTTY;
1616 break;
1617 }
1618
1619done:
1620 mutex_unlock(&dev->mutex);
1621 return rc;
1622}
1623
34c43922 1624static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
ed9eccbe
DS		 1625{
1626 int ret = 0;
1627
1628 if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) && s->cancel)
1629 ret = s->cancel(dev, s);
1630
1631 do_become_nonbusy(dev, s);
1632
1633 return ret;
1634}
1635
df30b21c
FV		 1636
1637static void comedi_vm_open(struct vm_area_struct *area)
1638{
1639 struct comedi_async *async;
1640 struct comedi_device *dev;
1641
1642 async = area->vm_private_data;
1643 dev = async->subdevice->device;
1644
1645 mutex_lock(&dev->mutex);
1646 async->mmap_count++;
1647 mutex_unlock(&dev->mutex);
1648}
1649
1650static void comedi_vm_close(struct vm_area_struct *area)
ed9eccbe 1651{
d163679c 1652 struct comedi_async *async;
71b5f4f1 1653 struct comedi_device *dev;
ed9eccbe
DS		 1654
1655 async = area->vm_private_data;
1656 dev = async->subdevice->device;
1657
1658 mutex_lock(&dev->mutex);
1659 async->mmap_count--;
1660 mutex_unlock(&dev->mutex);
1661}
1662
1663static struct vm_operations_struct comedi_vm_ops = {
df30b21c
FV		 1664 .open = comedi_vm_open,
1665 .close = comedi_vm_close,
ed9eccbe
DS		 1666};
1667
1668static int comedi_mmap(struct file *file, struct vm_area_struct *vma)
1669{
1670 const unsigned minor = iminor(file->f_dentry->d_inode);
d163679c 1671 struct comedi_async *async = NULL;
ed9eccbe
DS		 1672 unsigned long start = vma->vm_start;
1673 unsigned long size;
1674 int n_pages;
1675 int i;
1676 int retval;
34c43922 1677 struct comedi_subdevice *s;
3ffab428
BP		 1678 struct comedi_device_file_info *dev_file_info;
1679 struct comedi_device *dev;
1680
1681 dev_file_info = comedi_get_device_file_info(minor);
1682 if (dev_file_info == NULL)
70fe742c 1683 return -ENODEV;
3ffab428
BP		 1684 dev = dev_file_info->device;
1685 if (dev == NULL)
70fe742c 1686 return -ENODEV;
ed9eccbe
DS		 1687
1688 mutex_lock(&dev->mutex);
1689 if (!dev->attached) {
1690 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1691 retval = -ENODEV;
1692 goto done;
1693 }
476b8477 1694 if (vma->vm_flags & VM_WRITE)
ed9eccbe 1695 s = comedi_get_write_subdevice(dev_file_info);
476b8477 1696 else
ed9eccbe 1697 s = comedi_get_read_subdevice(dev_file_info);
476b8477 1698
ed9eccbe
DS		 1699 if (s == NULL) {
1700 retval = -EINVAL;
1701 goto done;
1702 }
1703 async = s->async;
1704 if (async == NULL) {
1705 retval = -EINVAL;
1706 goto done;
1707 }
1708
1709 if (vma->vm_pgoff != 0) {
1710 DPRINTK("comedi: mmap() offset must be 0.\n");
1711 retval = -EINVAL;
1712 goto done;
1713 }
1714
1715 size = vma->vm_end - vma->vm_start;
1716 if (size > async->prealloc_bufsz) {
1717 retval = -EFAULT;
1718 goto done;
1719 }
1720 if (size & (~PAGE_MASK)) {
1721 retval = -EFAULT;
1722 goto done;
1723 }
1724
1725 n_pages = size >> PAGE_SHIFT;
1726 for (i = 0; i < n_pages; ++i) {
1727 if (remap_pfn_range(vma, start,
0a85b6f0
MT		 1728 page_to_pfn(virt_to_page
1729 (async->buf_page_list
1730 [i].virt_addr)), PAGE_SIZE,
1731 PAGE_SHARED)) {
ed9eccbe
DS		 1732 retval = -EAGAIN;
1733 goto done;
1734 }
1735 start += PAGE_SIZE;
1736 }
1737
1738 vma->vm_ops = &comedi_vm_ops;
1739 vma->vm_private_data = async;
1740
1741 async->mmap_count++;
1742
1743 retval = 0;
476b8477 1744done:
ed9eccbe
DS		 1745 mutex_unlock(&dev->mutex);
1746 return retval;
1747}
1748
1ae5062a 1749static unsigned int comedi_poll(struct file *file, poll_table *wait)
ed9eccbe
DS		 1750{
1751 unsigned int mask = 0;
1752 const unsigned minor = iminor(file->f_dentry->d_inode);
34c43922
BP		 1753 struct comedi_subdevice *read_subdev;
1754 struct comedi_subdevice *write_subdev;
3ffab428
BP		 1755 struct comedi_device_file_info *dev_file_info;
1756 struct comedi_device *dev;
1757 dev_file_info = comedi_get_device_file_info(minor);
1758
1759 if (dev_file_info == NULL)
70fe742c 1760 return -ENODEV;
3ffab428
BP		 1761 dev = dev_file_info->device;
1762 if (dev == NULL)
70fe742c 1763 return -ENODEV;
ed9eccbe
DS		 1764
1765 mutex_lock(&dev->mutex);
1766 if (!dev->attached) {
1767 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1768 mutex_unlock(&dev->mutex);
1769 return 0;
1770 }
1771
1772 mask = 0;
1773 read_subdev = comedi_get_read_subdevice(dev_file_info);
1774 if (read_subdev) {
1775 poll_wait(file, &read_subdev->async->wait_head, wait);
1776 if (!read_subdev->busy
476b8477
GKH		 1777 || comedi_buf_read_n_available(read_subdev->async) > 0
1778 || !(comedi_get_subdevice_runflags(read_subdev) &
1779 SRF_RUNNING)) {
ed9eccbe
DS		 1780 mask |= POLLIN | POLLRDNORM;
1781 }
1782 }
1783 write_subdev = comedi_get_write_subdevice(dev_file_info);
1784 if (write_subdev) {
1785 poll_wait(file, &write_subdev->async->wait_head, wait);
476b8477
GKH		 1786 comedi_buf_write_alloc(write_subdev->async,
1787 write_subdev->async->prealloc_bufsz);
ed9eccbe 1788 if (!write_subdev->busy
476b8477
GKH		 1789 || !(comedi_get_subdevice_runflags(write_subdev) &
1790 SRF_RUNNING)
1791 || comedi_buf_write_n_allocated(write_subdev->async) >=
1792 bytes_per_sample(write_subdev->async->subdevice)) {
ed9eccbe
DS		 1793 mask |= POLLOUT | POLLWRNORM;
1794 }
1795 }
1796
1797 mutex_unlock(&dev->mutex);
1798 return mask;
1799}
1800
92d0127c
GKH		 1801static ssize_t comedi_write(struct file *file, const char __user *buf,
1802 size_t nbytes, loff_t *offset)
ed9eccbe 1803{
34c43922 1804 struct comedi_subdevice *s;
d163679c 1805 struct comedi_async *async;
ed9eccbe
DS		 1806 int n, m, count = 0, retval = 0;
1807 DECLARE_WAITQUEUE(wait, current);
1808 const unsigned minor = iminor(file->f_dentry->d_inode);
3ffab428
BP		 1809 struct comedi_device_file_info *dev_file_info;
1810 struct comedi_device *dev;
1811 dev_file_info = comedi_get_device_file_info(minor);
1812
1813 if (dev_file_info == NULL)
70fe742c 1814 return -ENODEV;
3ffab428
BP		 1815 dev = dev_file_info->device;
1816 if (dev == NULL)
70fe742c 1817 return -ENODEV;
ed9eccbe
DS		 1818
1819 if (!dev->attached) {
1820 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1821 retval = -ENODEV;
1822 goto done;
1823 }
1824
1825 s = comedi_get_write_subdevice(dev_file_info);
1826 if (s == NULL) {
1827 retval = -EIO;
1828 goto done;
1829 }
1830 async = s->async;
1831
1832 if (!nbytes) {
1833 retval = 0;
1834 goto done;
1835 }
1836 if (!s->busy) {
1837 retval = 0;
1838 goto done;
1839 }
1840 if (s->busy != file) {
1841 retval = -EACCES;
1842 goto done;
1843 }
1844 add_wait_queue(&async->wait_head, &wait);
1845 while (nbytes > 0 && !retval) {
1846 set_current_state(TASK_INTERRUPTIBLE);
1847
d2611540
IA		 1848 if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) {
1849 if (count == 0) {
1850 if (comedi_get_subdevice_runflags(s) &
1851 SRF_ERROR) {
1852 retval = -EPIPE;
1853 } else {
1854 retval = 0;
1855 }
1856 do_become_nonbusy(dev, s);
1857 }
1858 break;
1859 }
1860
ed9eccbe
DS		 1861 n = nbytes;
1862
1863 m = n;
476b8477 1864 if (async->buf_write_ptr + m > async->prealloc_bufsz)
ed9eccbe 1865 m = async->prealloc_bufsz - async->buf_write_ptr;
ed9eccbe 1866 comedi_buf_write_alloc(async, async->prealloc_bufsz);
476b8477 1867 if (m > comedi_buf_write_n_allocated(async))
ed9eccbe 1868 m = comedi_buf_write_n_allocated(async);
ed9eccbe
DS		 1869 if (m < n)
1870 n = m;
1871
1872 if (n == 0) {
ed9eccbe
DS		 1873 if (file->f_flags & O_NONBLOCK) {
1874 retval = -EAGAIN;
1875 break;
1876 }
6a9ce6b6 1877 schedule();
ed9eccbe
DS		 1878 if (signal_pending(current)) {
1879 retval = -ERESTARTSYS;
1880 break;
1881 }
476b8477 1882 if (!s->busy)
ed9eccbe 1883 break;
ed9eccbe
DS		 1884 if (s->busy != file) {
1885 retval = -EACCES;
1886 break;
1887 }
1888 continue;
1889 }
1890
1891 m = copy_from_user(async->prealloc_buf + async->buf_write_ptr,
476b8477 1892 buf, n);
ed9eccbe
DS		 1893 if (m) {
1894 n -= m;
1895 retval = -EFAULT;
1896 }
1897 comedi_buf_write_free(async, n);
1898
1899 count += n;
1900 nbytes -= n;
1901
1902 buf += n;
1903 break; /* makes device work like a pipe */
1904 }
1905 set_current_state(TASK_RUNNING);
1906 remove_wait_queue(&async->wait_head, &wait);
1907
1908done:
476b8477 1909 return count ? count : retval;
ed9eccbe
DS		 1910}
1911
92d0127c 1912static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes,
6705b68d 1913 loff_t *offset)
ed9eccbe 1914{
34c43922 1915 struct comedi_subdevice *s;
d163679c 1916 struct comedi_async *async;
ed9eccbe
DS		 1917 int n, m, count = 0, retval = 0;
1918 DECLARE_WAITQUEUE(wait, current);
1919 const unsigned minor = iminor(file->f_dentry->d_inode);
3ffab428
BP		 1920 struct comedi_device_file_info *dev_file_info;
1921 struct comedi_device *dev;
1922 dev_file_info = comedi_get_device_file_info(minor);
1923
1924 if (dev_file_info == NULL)
70fe742c 1925 return -ENODEV;
3ffab428
BP		 1926 dev = dev_file_info->device;
1927 if (dev == NULL)
70fe742c 1928 return -ENODEV;
ed9eccbe
DS		 1929
1930 if (!dev->attached) {
1931 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1932 retval = -ENODEV;
1933 goto done;
1934 }
1935
1936 s = comedi_get_read_subdevice(dev_file_info);
1937 if (s == NULL) {
1938 retval = -EIO;
1939 goto done;
1940 }
1941 async = s->async;
1942 if (!nbytes) {
1943 retval = 0;
1944 goto done;
1945 }
1946 if (!s->busy) {
1947 retval = 0;
1948 goto done;
1949 }
1950 if (s->busy != file) {
1951 retval = -EACCES;
1952 goto done;
1953 }
1954
1955 add_wait_queue(&async->wait_head, &wait);
1956 while (nbytes > 0 && !retval) {
1957 set_current_state(TASK_INTERRUPTIBLE);
1958
1959 n = nbytes;
1960
1961 m = comedi_buf_read_n_available(async);
476b8477
GKH		 1962 /* printk("%d available\n",m); */
1963 if (async->buf_read_ptr + m > async->prealloc_bufsz)
ed9eccbe 1964 m = async->prealloc_bufsz - async->buf_read_ptr;
476b8477 1965 /* printk("%d contiguous\n",m); */
ed9eccbe
DS		 1966 if (m < n)
1967 n = m;
1968
1969 if (n == 0) {
1970 if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) {
1971 do_become_nonbusy(dev, s);
1972 if (comedi_get_subdevice_runflags(s) &
476b8477 1973 SRF_ERROR) {
ed9eccbe
DS		 1974 retval = -EPIPE;
1975 } else {
1976 retval = 0;
1977 }
1978 break;
1979 }
1980 if (file->f_flags & O_NONBLOCK) {
1981 retval = -EAGAIN;
1982 break;
1983 }
6a9ce6b6 1984 schedule();
ed9eccbe
DS		 1985 if (signal_pending(current)) {
1986 retval = -ERESTARTSYS;
1987 break;
1988 }
ed9eccbe
DS		 1989 if (!s->busy) {
1990 retval = 0;
1991 break;
1992 }
1993 if (s->busy != file) {
1994 retval = -EACCES;
1995 break;
1996 }
1997 continue;
1998 }
1999 m = copy_to_user(buf, async->prealloc_buf +
476b8477 2000 async->buf_read_ptr, n);
ed9eccbe
DS		 2001 if (m) {
2002 n -= m;
2003 retval = -EFAULT;
2004 }
2005
2006 comedi_buf_read_alloc(async, n);
2007 comedi_buf_read_free(async, n);
2008
2009 count += n;
2010 nbytes -= n;
2011
2012 buf += n;
2013 break; /* makes device work like a pipe */
2014 }
2015 if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | SRF_RUNNING)) &&
476b8477 2016 async->buf_read_count - async->buf_write_count == 0) {
ed9eccbe
DS		 2017 do_become_nonbusy(dev, s);
2018 }
2019 set_current_state(TASK_RUNNING);
2020 remove_wait_queue(&async->wait_head, &wait);
2021
2022done:
476b8477 2023 return count ? count : retval;
ed9eccbe
DS		 2024}
2025
2026/*
2027 This function restores a subdevice to an idle state.
2028 */
3e76c951
HS		 2029static void do_become_nonbusy(struct comedi_device *dev,
2030 struct comedi_subdevice *s)
ed9eccbe 2031{
d163679c 2032 struct comedi_async *async = s->async;
ed9eccbe
DS		 2033
2034 comedi_set_subdevice_runflags(s, SRF_RUNNING, 0);
ed9eccbe
DS		 2035 if (async) {
2036 comedi_reset_async_buf(async);
2037 async->inttrig = NULL;
c8cad4c8
IA		 2038 kfree(async->cmd.chanlist);
2039 async->cmd.chanlist = NULL;
ed9eccbe 2040 } else {
4f870fe6
IA		 2041 dev_err(dev->class_dev,
2042 "BUG: (?) do_become_nonbusy called with async=NULL\n");
ed9eccbe
DS		 2043 }
2044
2045 s->busy = NULL;
2046}
2047
2048static int comedi_open(struct inode *inode, struct file *file)
2049{
ed9eccbe 2050 const unsigned minor = iminor(inode);
476b8477
GKH		 2051 struct comedi_device_file_info *dev_file_info =
2052 comedi_get_device_file_info(minor);
0a85b6f0
MT		 2053 struct comedi_device *dev =
2054 dev_file_info ? dev_file_info->device : NULL;
97920071 2055
ed9eccbe
DS		 2056 if (dev == NULL) {
2057 DPRINTK("invalid minor number\n");
2058 return -ENODEV;
2059 }
2060
2061 /* This is slightly hacky, but we want module autoloading
2062 * to work for root.
2063 * case: user opens device, attached -> ok
2064 * case: user opens device, unattached, in_request_module=0 -> autoload
2065 * case: user opens device, unattached, in_request_module=1 -> fail
2066 * case: root opens device, attached -> ok
2067 * case: root opens device, unattached, in_request_module=1 -> ok
2068 * (typically called from modprobe)
2069 * case: root opens device, unattached, in_request_module=0 -> autoload
2070 *
2071 * The last could be changed to "-> ok", which would deny root
2072 * autoloading.
2073 */
2074 mutex_lock(&dev->mutex);
2075 if (dev->attached)
2076 goto ok;
a8f80e8f 2077 if (!capable(CAP_NET_ADMIN) && dev->in_request_module) {
ed9eccbe
DS		 2078 DPRINTK("in request module\n");
2079 mutex_unlock(&dev->mutex);
2080 return -ENODEV;
2081 }
a8f80e8f 2082 if (capable(CAP_NET_ADMIN) && dev->in_request_module)
ed9eccbe
DS		 2083 goto ok;
2084
2085 dev->in_request_module = 1;
2086
ed9eccbe
DS		 2087#ifdef CONFIG_KMOD
2088 mutex_unlock(&dev->mutex);
56d92c60 2089 request_module("char-major-%i-%i", COMEDI_MAJOR, dev->minor);
ed9eccbe
DS		 2090 mutex_lock(&dev->mutex);
2091#endif
2092
2093 dev->in_request_module = 0;
2094
a8f80e8f
EP		 2095 if (!dev->attached && !capable(CAP_NET_ADMIN)) {
2096 DPRINTK("not attached and not CAP_NET_ADMIN\n");
ed9eccbe
DS		 2097 mutex_unlock(&dev->mutex);
2098 return -ENODEV;
2099 }
2100ok:
2101 __module_get(THIS_MODULE);
2102
2103 if (dev->attached) {
2104 if (!try_module_get(dev->driver->module)) {
2105 module_put(THIS_MODULE);
2106 mutex_unlock(&dev->mutex);
2107 return -ENOSYS;
2108 }
2109 }
2110
3c17ba07
IA		 2111 if (dev->attached && dev->use_count == 0 && dev->open) {
2112 int rc = dev->open(dev);
2113 if (rc < 0) {
2114 module_put(dev->driver->module);
2115 module_put(THIS_MODULE);
2116 mutex_unlock(&dev->mutex);
2117 return rc;
2118 }
2119 }
ed9eccbe
DS		 2120
2121 dev->use_count++;
2122
a5011a26 2123 mutex_unlock(&dev->mutex);
ed9eccbe 2124
a5011a26 2125 return 0;
ed9eccbe
DS		 2126}
2127
a5011a26 2128static int comedi_close(struct inode *inode, struct file *file)
ed9eccbe 2129{
a5011a26
HS		 2130 const unsigned minor = iminor(inode);
2131 struct comedi_subdevice *s = NULL;
ed9eccbe 2132 int i;
a5011a26
HS		 2133 struct comedi_device_file_info *dev_file_info;
2134 struct comedi_device *dev;
2135 dev_file_info = comedi_get_device_file_info(minor);
ed9eccbe 2136
a5011a26
HS		 2137 if (dev_file_info == NULL)
2138 return -ENODEV;
2139 dev = dev_file_info->device;
2140 if (dev == NULL)
2141 return -ENODEV;
ed9eccbe 2142
a5011a26
HS		 2143 mutex_lock(&dev->mutex);
2144
2145 if (dev->subdevices) {
2146 for (i = 0; i < dev->n_subdevices; i++) {
b077f2cd 2147 s = &dev->subdevices[i];
a5011a26
HS		 2148
2149 if (s->busy == file)
2150 do_cancel(dev, s);
2151 if (s->lock == file)
2152 s->lock = NULL;
2153 }
ed9eccbe 2154 }
a5011a26
HS		 2155 if (dev->attached && dev->use_count == 1 && dev->close)
2156 dev->close(dev);
2157
2158 module_put(THIS_MODULE);
2159 if (dev->attached)
2160 module_put(dev->driver->module);
2161
2162 dev->use_count--;
2163
2164 mutex_unlock(&dev->mutex);
2165
2166 if (file->f_flags & FASYNC)
2167 comedi_fasync(-1, file, 0);
ed9eccbe
DS		 2168
2169 return 0;
2170}
2171
a5011a26 2172static int comedi_fasync(int fd, struct file *file, int on)
ed9eccbe 2173{
a5011a26
HS		 2174 const unsigned minor = iminor(file->f_dentry->d_inode);
2175 struct comedi_device_file_info *dev_file_info;
2176 struct comedi_device *dev;
2177 dev_file_info = comedi_get_device_file_info(minor);
ed9eccbe 2178
a5011a26
HS		 2179 if (dev_file_info == NULL)
2180 return -ENODEV;
2181 dev = dev_file_info->device;
476b8477 2182 if (dev == NULL)
a5011a26
HS		 2183 return -ENODEV;
2184
2185 return fasync_helper(fd, file, on, &dev->async_queue);
ed9eccbe
DS		 2186}
2187
8cb8aad7 2188static const struct file_operations comedi_fops = {
a5011a26
HS		 2189 .owner = THIS_MODULE,
2190 .unlocked_ioctl = comedi_unlocked_ioctl,
2191 .compat_ioctl = comedi_compat_ioctl,
2192 .open = comedi_open,
2193 .release = comedi_close,
2194 .read = comedi_read,
2195 .write = comedi_write,
2196 .mmap = comedi_mmap,
2197 .poll = comedi_poll,
2198 .fasync = comedi_fasync,
2199 .llseek = noop_llseek,
2200};
2201
8cb8aad7 2202static struct class *comedi_class;
a5011a26
HS		 2203static struct cdev comedi_cdev;
2204
2205static void comedi_cleanup_legacy_minors(void)
ed9eccbe 2206{
ed9eccbe
DS		 2207 unsigned i;
2208
a5011a26 2209 for (i = 0; i < comedi_num_legacy_minors; i++)
883db3d9 2210 comedi_free_board_minor(i);
ed9eccbe
DS		 2211}
2212
a5011a26 2213static int __init comedi_init(void)
ed9eccbe 2214{
a5011a26
HS		 2215 int i;
2216 int retval;
ed9eccbe 2217
4f870fe6 2218 pr_info("comedi: version " COMEDI_RELEASE " - http://www.comedi.org\n");
ed9eccbe 2219
a5011a26
HS		 2220 if (comedi_num_legacy_minors < 0 ||
2221 comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) {
4f870fe6
IA		 2222 pr_err("comedi: error: invalid value for module parameter \"comedi_num_legacy_minors\". Valid values are 0 through %i.\n",
2223 COMEDI_NUM_BOARD_MINORS);
a5011a26 2224 return -EINVAL;
ed9eccbe 2225 }
c43435d7 2226
a5011a26
HS		 2227 /*
2228 * comedi is unusable if both comedi_autoconfig and
2229 * comedi_num_legacy_minors are zero, so we might as well adjust the
2230 * defaults in that case
2231 */
2232 if (comedi_autoconfig == 0 && comedi_num_legacy_minors == 0)
2233 comedi_num_legacy_minors = 16;
c43435d7 2234
a5011a26
HS		 2235 memset(comedi_file_info_table, 0,
2236 sizeof(struct comedi_device_file_info *) * COMEDI_NUM_MINORS);
ed9eccbe 2237
a5011a26
HS		 2238 retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2239 COMEDI_NUM_MINORS, "comedi");
2240 if (retval)
2241 return -EIO;
2242 cdev_init(&comedi_cdev, &comedi_fops);
2243 comedi_cdev.owner = THIS_MODULE;
2244 kobject_set_name(&comedi_cdev.kobj, "comedi");
2245 if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) {
2246 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2247 COMEDI_NUM_MINORS);
2248 return -EIO;
883db3d9 2249 }
a5011a26
HS		 2250 comedi_class = class_create(THIS_MODULE, "comedi");
2251 if (IS_ERR(comedi_class)) {
4f870fe6 2252 pr_err("comedi: failed to create class\n");
a5011a26
HS		 2253 cdev_del(&comedi_cdev);
2254 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2255 COMEDI_NUM_MINORS);
2256 return PTR_ERR(comedi_class);
883db3d9 2257 }
a5011a26 2258
fb60367d
HS		 2259 comedi_class->dev_attrs = comedi_dev_attrs;
2260
a5011a26
HS		 2261 /* XXX requires /proc interface */
2262 comedi_proc_init();
2263
2264 /* create devices files for legacy/manual use */
2265 for (i = 0; i < comedi_num_legacy_minors; i++) {
2266 int minor;
2267 minor = comedi_alloc_board_minor(NULL);
2268 if (minor < 0) {
2269 comedi_cleanup_legacy_minors();
2270 cdev_del(&comedi_cdev);
2271 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2272 COMEDI_NUM_MINORS);
2273 return minor;
2274 }
883db3d9 2275 }
a5011a26
HS		 2276
2277 return 0;
ed9eccbe
DS		 2278}
2279
a5011a26 2280static void __exit comedi_cleanup(void)
ed9eccbe 2281{
a5011a26 2282 int i;
ed9eccbe 2283
a5011a26
HS		 2284 comedi_cleanup_legacy_minors();
2285 for (i = 0; i < COMEDI_NUM_MINORS; ++i)
2286 BUG_ON(comedi_file_info_table[i]);
ed9eccbe 2287
a5011a26
HS		 2288 class_destroy(comedi_class);
2289 cdev_del(&comedi_cdev);
2290 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS);
ed9eccbe 2291
a5011a26 2292 comedi_proc_cleanup();
ed9eccbe
DS		 2293}
2294
a5011a26
HS		 2295module_init(comedi_init);
2296module_exit(comedi_cleanup);
ed9eccbe 2297
a5011a26
HS		 2298void comedi_error(const struct comedi_device *dev, const char *s)
2299{
4f870fe6 2300 dev_err(dev->class_dev, "%s: %s\n", dev->driver->driver_name, s);
ed9eccbe 2301}
a5011a26 2302EXPORT_SYMBOL(comedi_error);
883db3d9 2303
a5011a26 2304void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s)
883db3d9 2305{
a5011a26
HS		 2306 struct comedi_async *async = s->async;
2307 unsigned runflags = 0;
2308 unsigned runflags_mask = 0;
883db3d9 2309
a5011a26 2310 /* DPRINTK("comedi_event 0x%x\n",mask); */
883db3d9 2311
a5011a26
HS		 2312 if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) == 0)
2313 return;
2314
2315 if (s->
2316 async->events & (COMEDI_CB_EOA | COMEDI_CB_ERROR |
2317 COMEDI_CB_OVERFLOW)) {
2318 runflags_mask |= SRF_RUNNING;
883db3d9 2319 }
a5011a26
HS		 2320 /* remember if an error event has occurred, so an error
2321 * can be returned the next time the user does a read() */
2322 if (s->async->events & (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) {
2323 runflags_mask |= SRF_ERROR;
2324 runflags |= SRF_ERROR;
883db3d9 2325 }
a5011a26
HS		 2326 if (runflags_mask) {
2327 /*sets SRF_ERROR and SRF_RUNNING together atomically */
2328 comedi_set_subdevice_runflags(s, runflags_mask, runflags);
883db3d9
FMH		 2329 }
2330
a5011a26
HS		 2331 if (async->cb_mask & s->async->events) {
2332 if (comedi_get_subdevice_runflags(s) & SRF_USER) {
2333 wake_up_interruptible(&async->wait_head);
2334 if (s->subdev_flags & SDF_CMD_READ)
2335 kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
2336 if (s->subdev_flags & SDF_CMD_WRITE)
2337 kill_fasync(&dev->async_queue, SIGIO, POLL_OUT);
2338 } else {
2339 if (async->cb_func)
2340 async->cb_func(s->async->events, async->cb_arg);
2341 }
2342 }
2343 s->async->events = 0;
883db3d9 2344}
a5011a26 2345EXPORT_SYMBOL(comedi_event);
883db3d9 2346
a5011a26 2347unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s)
883db3d9 2348{
a5011a26
HS		 2349 unsigned long flags;
2350 unsigned runflags;
883db3d9 2351
a5011a26
HS		 2352 spin_lock_irqsave(&s->spin_lock, flags);
2353 runflags = s->runflags;
2354 spin_unlock_irqrestore(&s->spin_lock, flags);
2355 return runflags;
883db3d9 2356}
a5011a26 2357EXPORT_SYMBOL(comedi_get_subdevice_runflags);
883db3d9 2358
a5011a26 2359static int is_device_busy(struct comedi_device *dev)
883db3d9 2360{
a5011a26
HS		 2361 struct comedi_subdevice *s;
2362 int i;
883db3d9 2363
a5011a26
HS		 2364 if (!dev->attached)
2365 return 0;
883db3d9 2366
a5011a26 2367 for (i = 0; i < dev->n_subdevices; i++) {
b077f2cd 2368 s = &dev->subdevices[i];
a5011a26
HS		 2369 if (s->busy)
2370 return 1;
2371 if (s->async && s->async->mmap_count)
2372 return 1;
883db3d9 2373 }
883db3d9 2374
a5011a26 2375 return 0;
883db3d9
FMH		 2376}
2377
a5011a26
HS		 2378static void comedi_device_init(struct comedi_device *dev)
2379{
2380 memset(dev, 0, sizeof(struct comedi_device));
2381 spin_lock_init(&dev->spinlock);
2382 mutex_init(&dev->mutex);
2383 dev->minor = -1;
2384}
883db3d9 2385
a5011a26 2386static void comedi_device_cleanup(struct comedi_device *dev)
883db3d9 2387{
a5011a26
HS		 2388 if (dev == NULL)
2389 return;
2390 mutex_lock(&dev->mutex);
2391 comedi_device_detach(dev);
2392 mutex_unlock(&dev->mutex);
2393 mutex_destroy(&dev->mutex);
2394}
2395
2396int comedi_alloc_board_minor(struct device *hardware_device)
2397{
2398 struct comedi_device_file_info *info;
2399 struct device *csdev;
2400 unsigned i;
a5011a26
HS		 2401
2402 info = kzalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL);
2403 if (info == NULL)
2404 return -ENOMEM;
2405 info->device = kzalloc(sizeof(struct comedi_device), GFP_KERNEL);
2406 if (info->device == NULL) {
2407 kfree(info);
2408 return -ENOMEM;
2409 }
2410 info->hardware_device = hardware_device;
2411 comedi_device_init(info->device);
2412 spin_lock(&comedi_file_info_table_lock);
2413 for (i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i) {
2414 if (comedi_file_info_table[i] == NULL) {
2415 comedi_file_info_table[i] = info;
2416 break;
2417 }
2418 }
2419 spin_unlock(&comedi_file_info_table_lock);
2420 if (i == COMEDI_NUM_BOARD_MINORS) {
2421 comedi_device_cleanup(info->device);
2422 kfree(info->device);
2423 kfree(info);
4f870fe6 2424 pr_err("comedi: error: ran out of minor numbers for board device files.\n");
a5011a26
HS		 2425 return -EBUSY;
2426 }
2427 info->device->minor = i;
2428 csdev = device_create(comedi_class, hardware_device,
2429 MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i", i);
2430 if (!IS_ERR(csdev))
2431 info->device->class_dev = csdev;
2432 dev_set_drvdata(csdev, info);
883db3d9 2433
a5011a26 2434 return i;
883db3d9
FMH		 2435}
2436
a5011a26 2437void comedi_free_board_minor(unsigned minor)
883db3d9 2438{
a5011a26 2439 struct comedi_device_file_info *info;
883db3d9 2440
a5011a26
HS		 2441 BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS);
2442 spin_lock(&comedi_file_info_table_lock);
2443 info = comedi_file_info_table[minor];
2444 comedi_file_info_table[minor] = NULL;
2445 spin_unlock(&comedi_file_info_table_lock);
883db3d9 2446
a5011a26
HS		 2447 if (info) {
2448 struct comedi_device *dev = info->device;
2449 if (dev) {
2450 if (dev->class_dev) {
2451 device_destroy(comedi_class,
2452 MKDEV(COMEDI_MAJOR, dev->minor));
2453 }
2454 comedi_device_cleanup(dev);
2455 kfree(dev);
2456 }
2457 kfree(info);
883db3d9 2458 }
883db3d9
FMH		 2459}
2460
a5011a26 2461int comedi_find_board_minor(struct device *hardware_device)
883db3d9 2462{
a5011a26
HS		 2463 int minor;
2464 struct comedi_device_file_info *info;
883db3d9 2465
a5011a26
HS		 2466 for (minor = 0; minor < COMEDI_NUM_BOARD_MINORS; minor++) {
2467 spin_lock(&comedi_file_info_table_lock);
2468 info = comedi_file_info_table[minor];
2469 if (info && info->hardware_device == hardware_device) {
2470 spin_unlock(&comedi_file_info_table_lock);
2471 return minor;
2472 }
2473 spin_unlock(&comedi_file_info_table_lock);
883db3d9 2474 }
a5011a26 2475 return -ENODEV;
883db3d9
FMH		 2476}
2477
a5011a26
HS		 2478int comedi_alloc_subdevice_minor(struct comedi_device *dev,
2479 struct comedi_subdevice *s)
883db3d9 2480{
a5011a26
HS		 2481 struct comedi_device_file_info *info;
2482 struct device *csdev;
2483 unsigned i;
883db3d9 2484
a5011a26
HS		 2485 info = kmalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL);
2486 if (info == NULL)
2487 return -ENOMEM;
2488 info->device = dev;
2489 info->read_subdevice = s;
2490 info->write_subdevice = s;
2491 spin_lock(&comedi_file_info_table_lock);
2492 for (i = COMEDI_FIRST_SUBDEVICE_MINOR; i < COMEDI_NUM_MINORS; ++i) {
2493 if (comedi_file_info_table[i] == NULL) {
2494 comedi_file_info_table[i] = info;
2495 break;
2496 }
2497 }
2498 spin_unlock(&comedi_file_info_table_lock);
2499 if (i == COMEDI_NUM_MINORS) {
2500 kfree(info);
4f870fe6 2501 pr_err("comedi: error: ran out of minor numbers for board device files.\n");
a5011a26
HS		 2502 return -EBUSY;
2503 }
2504 s->minor = i;
2505 csdev = device_create(comedi_class, dev->class_dev,
2506 MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i_subd%i",
2507 dev->minor, (int)(s - dev->subdevices));
2508 if (!IS_ERR(csdev))
2509 s->class_dev = csdev;
2510 dev_set_drvdata(csdev, info);
883db3d9 2511
a5011a26 2512 return i;
883db3d9
FMH		 2513}
2514
a5011a26 2515void comedi_free_subdevice_minor(struct comedi_subdevice *s)
883db3d9 2516{
a5011a26 2517 struct comedi_device_file_info *info;
883db3d9 2518
a5011a26
HS		 2519 if (s == NULL)
2520 return;
2521 if (s->minor < 0)
2522 return;
883db3d9 2523
a5011a26
HS		 2524 BUG_ON(s->minor >= COMEDI_NUM_MINORS);
2525 BUG_ON(s->minor < COMEDI_FIRST_SUBDEVICE_MINOR);
883db3d9 2526
a5011a26
HS		 2527 spin_lock(&comedi_file_info_table_lock);
2528 info = comedi_file_info_table[s->minor];
2529 comedi_file_info_table[s->minor] = NULL;
2530 spin_unlock(&comedi_file_info_table_lock);
883db3d9 2531
a5011a26
HS		 2532 if (s->class_dev) {
2533 device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor));
2534 s->class_dev = NULL;
883db3d9 2535 }
a5011a26 2536 kfree(info);
883db3d9
FMH		 2537}
2538
a5011a26
HS		 2539struct comedi_device_file_info *comedi_get_device_file_info(unsigned minor)
2540{
2541 struct comedi_device_file_info *info;
2542
2543 BUG_ON(minor >= COMEDI_NUM_MINORS);
2544 spin_lock(&comedi_file_info_table_lock);
2545 info = comedi_file_info_table[minor];
2546 spin_unlock(&comedi_file_info_table_lock);
2547 return info;
2548}
2549EXPORT_SYMBOL_GPL(comedi_get_device_file_info);
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