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staging: comedi: don't expose struct comedi_device_file_info
[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
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
e79c8d21
HS		 89struct comedi_device_file_info {
90 struct comedi_device *device;
91 struct comedi_subdevice *read_subdevice;
92 struct comedi_subdevice *write_subdevice;
93 struct device *hardware_device;
94};
95
ed9eccbe 96static DEFINE_SPINLOCK(comedi_file_info_table_lock);
476b8477 97static struct comedi_device_file_info
0a85b6f0 98*comedi_file_info_table[COMEDI_NUM_MINORS];
476b8477 99
87b1ad7a
HS		 100static struct comedi_device_file_info *
101comedi_get_device_file_info(unsigned minor)
102{
103 struct comedi_device_file_info *info;
104
105 BUG_ON(minor >= COMEDI_NUM_MINORS);
106 spin_lock(&comedi_file_info_table_lock);
107 info = comedi_file_info_table[minor];
108 spin_unlock(&comedi_file_info_table_lock);
109 return info;
110}
111
85104e9b
HS		 112struct comedi_device *comedi_dev_from_minor(unsigned minor)
113{
114 struct comedi_device_file_info *info;
115
116 info = comedi_get_device_file_info(minor);
117
118 return info ? info->device : NULL;
119}
120EXPORT_SYMBOL_GPL(comedi_dev_from_minor);
121
43bd33f2
HS		 122static struct comedi_subdevice *
123comedi_get_read_subdevice(const struct comedi_device_file_info *info)
124{
125 if (info->read_subdevice)
126 return info->read_subdevice;
127 if (info->device == NULL)
128 return NULL;
129 return info->device->read_subdev;
130}
131
132static struct comedi_subdevice *
133comedi_get_write_subdevice(const struct comedi_device_file_info *info)
134{
135 if (info->write_subdevice)
136 return info->write_subdevice;
137 if (info->device == NULL)
138 return NULL;
139 return info->device->write_subdev;
140}
141
883db3d9
FMH		 142static int resize_async_buffer(struct comedi_device *dev,
143 struct comedi_subdevice *s,
a5011a26
HS		 144 struct comedi_async *async, unsigned new_size)
145{
146 int retval;
147
148 if (new_size > async->max_bufsize)
149 return -EPERM;
150
151 if (s->busy) {
152 DPRINTK("subdevice is busy, cannot resize buffer\n");
153 return -EBUSY;
154 }
155 if (async->mmap_count) {
156 DPRINTK("subdevice is mmapped, cannot resize buffer\n");
157 return -EBUSY;
158 }
159
160 if (!async->prealloc_buf)
161 return -EINVAL;
162
163 /* make sure buffer is an integral number of pages
164 * (we round up) */
165 new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK;
166
167 retval = comedi_buf_alloc(dev, s, new_size);
168 if (retval < 0)
169 return retval;
170
171 if (s->buf_change) {
172 retval = s->buf_change(dev, s, new_size);
173 if (retval < 0)
174 return retval;
175 }
176
177 DPRINTK("comedi%i subd %d buffer resized to %i bytes\n",
178 dev->minor, (int)(s - dev->subdevices), async->prealloc_bufsz);
179 return 0;
180}
181
182/* sysfs attribute files */
183
a5011a26
HS		 184static ssize_t show_max_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->max_bufsize / 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_max_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 s->async->max_bufsize = size;
218 else
219 err = -EINVAL;
a5011a26
HS		 220 mutex_unlock(&info->device->mutex);
221
72fd9fac 222 return err ? err : count;
a5011a26
HS		 223}
224
a5011a26
HS		 225static ssize_t show_read_buffer_kb(struct device *dev,
226 struct device_attribute *attr, char *buf)
227{
a5011a26 228 struct comedi_device_file_info *info = dev_get_drvdata(dev);
72fd9fac
HS		 229 struct comedi_subdevice *s = comedi_get_read_subdevice(info);
230 unsigned int size = 0;
a5011a26
HS		 231
232 mutex_lock(&info->device->mutex);
72fd9fac
HS		 233 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
234 size = s->async->prealloc_bufsz / 1024;
a5011a26
HS		 235 mutex_unlock(&info->device->mutex);
236
72fd9fac 237 return snprintf(buf, PAGE_SIZE, "%i\n", size);
a5011a26
HS		 238}
239
240static ssize_t store_read_buffer_kb(struct device *dev,
241 struct device_attribute *attr,
242 const char *buf, size_t count)
243{
244 struct comedi_device_file_info *info = dev_get_drvdata(dev);
72fd9fac
HS		 245 struct comedi_subdevice *s = comedi_get_read_subdevice(info);
246 unsigned int size;
247 int err;
248
249 err = kstrtouint(buf, 10, &size);
250 if (err)
251 return err;
252 if (size > (UINT_MAX / 1024))
a5011a26 253 return -EINVAL;
72fd9fac 254 size *= 1024;
a5011a26
HS		 255
256 mutex_lock(&info->device->mutex);
72fd9fac
HS		 257 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
258 err = resize_async_buffer(info->device, s, s->async, size);
259 else
260 err = -EINVAL;
a5011a26
HS		 261 mutex_unlock(&info->device->mutex);
262
72fd9fac 263 return err ? err : count;
a5011a26 264}
883db3d9 265
a5011a26
HS		 266static ssize_t show_max_write_buffer_kb(struct device *dev,
267 struct device_attribute *attr,
268 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->max_bufsize / 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_max_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 s->async->max_bufsize = 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
a5011a26
HS		 308static ssize_t show_write_buffer_kb(struct device *dev,
309 struct device_attribute *attr, char *buf)
310{
a5011a26 311 struct comedi_device_file_info *info = dev_get_drvdata(dev);
72fd9fac
HS		 312 struct comedi_subdevice *s = comedi_get_write_subdevice(info);
313 unsigned int size = 0;
a5011a26
HS		 314
315 mutex_lock(&info->device->mutex);
72fd9fac
HS		 316 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
317 size = s->async->prealloc_bufsz / 1024;
a5011a26
HS		 318 mutex_unlock(&info->device->mutex);
319
72fd9fac 320 return snprintf(buf, PAGE_SIZE, "%i\n", size);
a5011a26
HS		 321}
322
323static ssize_t store_write_buffer_kb(struct device *dev,
324 struct device_attribute *attr,
325 const char *buf, size_t count)
326{
327 struct comedi_device_file_info *info = dev_get_drvdata(dev);
72fd9fac
HS		 328 struct comedi_subdevice *s = comedi_get_write_subdevice(info);
329 unsigned int size;
330 int err;
331
332 err = kstrtouint(buf, 10, &size);
333 if (err)
334 return err;
335 if (size > (UINT_MAX / 1024))
a5011a26 336 return -EINVAL;
72fd9fac 337 size *= 1024;
a5011a26
HS		 338
339 mutex_lock(&info->device->mutex);
72fd9fac
HS		 340 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
341 err = resize_async_buffer(info->device, s, s->async, size);
342 else
343 err = -EINVAL;
a5011a26
HS		 344 mutex_unlock(&info->device->mutex);
345
72fd9fac 346 return err ? err : count;
a5011a26
HS		 347}
348
fb60367d
HS		 349static struct device_attribute comedi_dev_attrs[] = {
350 __ATTR(max_read_buffer_kb, S_IRUGO | S_IWUSR,
351 show_max_read_buffer_kb, store_max_read_buffer_kb),
352 __ATTR(read_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP,
353 show_read_buffer_kb, store_read_buffer_kb),
354 __ATTR(max_write_buffer_kb, S_IRUGO | S_IWUSR,
355 show_max_write_buffer_kb, store_max_write_buffer_kb),
356 __ATTR(write_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP,
357 show_write_buffer_kb, store_write_buffer_kb),
358 __ATTR_NULL
a5011a26 359};
ed9eccbe 360
2aae0076
HS		 361static void comedi_set_subdevice_runflags(struct comedi_subdevice *s,
362 unsigned mask, unsigned bits)
363{
364 unsigned long flags;
365
366 spin_lock_irqsave(&s->spin_lock, flags);
367 s->runflags &= ~mask;
368 s->runflags |= (bits & mask);
369 spin_unlock_irqrestore(&s->spin_lock, flags);
370}
371
372/*
373 This function restores a subdevice to an idle state.
374 */
375static void do_become_nonbusy(struct comedi_device *dev,
376 struct comedi_subdevice *s)
377{
378 struct comedi_async *async = s->async;
379
380 comedi_set_subdevice_runflags(s, SRF_RUNNING, 0);
381 if (async) {
382 comedi_reset_async_buf(async);
383 async->inttrig = NULL;
384 kfree(async->cmd.chanlist);
385 async->cmd.chanlist = NULL;
386 } else {
387 dev_err(dev->class_dev,
388 "BUG: (?) do_become_nonbusy called with async=NULL\n");
389 }
390
391 s->busy = NULL;
392}
393
394static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
395{
396 int ret = 0;
397
398 if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) && s->cancel)
399 ret = s->cancel(dev, s);
400
401 do_become_nonbusy(dev, s);
402
403 return ret;
404}
405
406static int is_device_busy(struct comedi_device *dev)
407{
408 struct comedi_subdevice *s;
409 int i;
410
411 if (!dev->attached)
412 return 0;
413
414 for (i = 0; i < dev->n_subdevices; i++) {
415 s = &dev->subdevices[i];
416 if (s->busy)
417 return 1;
418 if (s->async && s->async->mmap_count)
419 return 1;
420 }
421
422 return 0;
423}
424
ed9eccbe
DS		 425/*
426 COMEDI_DEVCONFIG
427 device config ioctl
428
429 arg:
430 pointer to devconfig structure
431
432 reads:
433 devconfig structure at arg
434
435 writes:
436 none
437*/
0a85b6f0 438static int do_devconfig_ioctl(struct comedi_device *dev,
92d0127c 439 struct comedi_devconfig __user *arg)
ed9eccbe 440{
0707bb04 441 struct comedi_devconfig it;
ed9eccbe
DS		 442 int ret;
443 unsigned char *aux_data = NULL;
444 int aux_len;
445
446 if (!capable(CAP_SYS_ADMIN))
447 return -EPERM;
448
449 if (arg == NULL) {
450 if (is_device_busy(dev))
451 return -EBUSY;
476b8477 452 if (dev->attached) {
ed9eccbe
DS		 453 struct module *driver_module = dev->driver->module;
454 comedi_device_detach(dev);
455 module_put(driver_module);
456 }
457 return 0;
458 }
459
0707bb04 460 if (copy_from_user(&it, arg, sizeof(struct comedi_devconfig)))
ed9eccbe
DS		 461 return -EFAULT;
462
463 it.board_name[COMEDI_NAMELEN - 1] = 0;
464
465 if (comedi_aux_data(it.options, 0) &&
476b8477 466 it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) {
ed9eccbe
DS		 467 int bit_shift;
468 aux_len = it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH];
469 if (aux_len < 0)
470 return -EFAULT;
471
472 aux_data = vmalloc(aux_len);
473 if (!aux_data)
474 return -ENOMEM;
475
476 if (copy_from_user(aux_data,
dc881f29
IA		 477 (unsigned char __user *
478 )comedi_aux_data(it.options, 0), aux_len)) {
ed9eccbe
DS		 479 vfree(aux_data);
480 return -EFAULT;
481 }
482 it.options[COMEDI_DEVCONF_AUX_DATA_LO] =
476b8477 483 (unsigned long)aux_data;
ed9eccbe
DS		 484 if (sizeof(void *) > sizeof(int)) {
485 bit_shift = sizeof(int) * 8;
486 it.options[COMEDI_DEVCONF_AUX_DATA_HI] =
476b8477 487 ((unsigned long)aux_data) >> bit_shift;
ed9eccbe
DS		 488 } else
489 it.options[COMEDI_DEVCONF_AUX_DATA_HI] = 0;
490 }
491
492 ret = comedi_device_attach(dev, &it);
476b8477
GKH		 493 if (ret == 0) {
494 if (!try_module_get(dev->driver->module)) {
ed9eccbe 495 comedi_device_detach(dev);
abae41e6 496 ret = -ENOSYS;
ed9eccbe
DS		 497 }
498 }
499
500 if (aux_data)
501 vfree(aux_data);
502
503 return ret;
504}
505
506/*
507 COMEDI_BUFCONFIG
508 buffer configuration ioctl
509
510 arg:
511 pointer to bufconfig structure
512
513 reads:
514 bufconfig at arg
515
516 writes:
517 modified bufconfig at arg
518
519*/
92d0127c
GKH		 520static int do_bufconfig_ioctl(struct comedi_device *dev,
521 struct comedi_bufconfig __user *arg)
ed9eccbe 522{
be6aba4a 523 struct comedi_bufconfig bc;
d163679c 524 struct comedi_async *async;
34c43922 525 struct comedi_subdevice *s;
883db3d9 526 int retval = 0;
ed9eccbe 527
be6aba4a 528 if (copy_from_user(&bc, arg, sizeof(struct comedi_bufconfig)))
ed9eccbe
DS		 529 return -EFAULT;
530
531 if (bc.subdevice >= dev->n_subdevices || bc.subdevice < 0)
532 return -EINVAL;
533
b077f2cd 534 s = &dev->subdevices[bc.subdevice];
ed9eccbe
DS		 535 async = s->async;
536
537 if (!async) {
538 DPRINTK("subdevice does not have async capability\n");
539 bc.size = 0;
540 bc.maximum_size = 0;
541 goto copyback;
542 }
543
544 if (bc.maximum_size) {
545 if (!capable(CAP_SYS_ADMIN))
546 return -EPERM;
547
548 async->max_bufsize = bc.maximum_size;
549 }
550
551 if (bc.size) {
883db3d9
FMH		 552 retval = resize_async_buffer(dev, s, async, bc.size);
553 if (retval < 0)
554 return retval;
ed9eccbe
DS		 555 }
556
557 bc.size = async->prealloc_bufsz;
558 bc.maximum_size = async->max_bufsize;
559
476b8477 560copyback:
be6aba4a 561 if (copy_to_user(arg, &bc, sizeof(struct comedi_bufconfig)))
ed9eccbe
DS		 562 return -EFAULT;
563
564 return 0;
565}
566
567/*
568 COMEDI_DEVINFO
569 device info ioctl
570
571 arg:
572 pointer to devinfo structure
573
574 reads:
575 none
576
577 writes:
578 devinfo structure
579
580*/
0a85b6f0 581static int do_devinfo_ioctl(struct comedi_device *dev,
92d0127c
GKH		 582 struct comedi_devinfo __user *arg,
583 struct file *file)
ed9eccbe 584{
063db04b 585 struct comedi_devinfo devinfo;
ed9eccbe 586 const unsigned minor = iminor(file->f_dentry->d_inode);
476b8477
GKH		 587 struct comedi_device_file_info *dev_file_info =
588 comedi_get_device_file_info(minor);
34c43922 589 struct comedi_subdevice *read_subdev =
476b8477 590 comedi_get_read_subdevice(dev_file_info);
34c43922 591 struct comedi_subdevice *write_subdev =
476b8477 592 comedi_get_write_subdevice(dev_file_info);
ed9eccbe
DS		 593
594 memset(&devinfo, 0, sizeof(devinfo));
595
596 /* fill devinfo structure */
597 devinfo.version_code = COMEDI_VERSION_CODE;
598 devinfo.n_subdevs = dev->n_subdevices;
819cbb12
VK		 599 strlcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN);
600 strlcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN);
ed9eccbe 601
476b8477 602 if (read_subdev)
ed9eccbe 603 devinfo.read_subdevice = read_subdev - dev->subdevices;
476b8477 604 else
ed9eccbe 605 devinfo.read_subdevice = -1;
476b8477
GKH		 606
607 if (write_subdev)
ed9eccbe 608 devinfo.write_subdevice = write_subdev - dev->subdevices;
476b8477 609 else
ed9eccbe 610 devinfo.write_subdevice = -1;
ed9eccbe 611
063db04b 612 if (copy_to_user(arg, &devinfo, sizeof(struct comedi_devinfo)))
ed9eccbe
DS		 613 return -EFAULT;
614
615 return 0;
616}
617
618/*
619 COMEDI_SUBDINFO
620 subdevice info ioctl
621
622 arg:
623 pointer to array of subdevice info structures
624
625 reads:
626 none
627
628 writes:
629 array of subdevice info structures at arg
630
631*/
0a85b6f0 632static int do_subdinfo_ioctl(struct comedi_device *dev,
92d0127c 633 struct comedi_subdinfo __user *arg, void *file)
ed9eccbe
DS		 634{
635 int ret, i;
bd52efbb 636 struct comedi_subdinfo *tmp, *us;
34c43922 637 struct comedi_subdevice *s;
ed9eccbe 638
0a85b6f0
MT		 639 tmp =
640 kcalloc(dev->n_subdevices, sizeof(struct comedi_subdinfo),
641 GFP_KERNEL);
ed9eccbe
DS		 642 if (!tmp)
643 return -ENOMEM;
644
645 /* fill subdinfo structs */
646 for (i = 0; i < dev->n_subdevices; i++) {
b077f2cd 647 s = &dev->subdevices[i];
ed9eccbe
DS		 648 us = tmp + i;
649
650 us->type = s->type;
651 us->n_chan = s->n_chan;
652 us->subd_flags = s->subdev_flags;
653 if (comedi_get_subdevice_runflags(s) & SRF_RUNNING)
654 us->subd_flags |= SDF_RUNNING;
655#define TIMER_nanosec 5 /* backwards compatibility */
656 us->timer_type = TIMER_nanosec;
657 us->len_chanlist = s->len_chanlist;
658 us->maxdata = s->maxdata;
659 if (s->range_table) {
660 us->range_type =
476b8477 661 (i << 24) | (0 << 16) | (s->range_table->length);
ed9eccbe
DS		 662 } else {
663 us->range_type = 0; /* XXX */
664 }
665 us->flags = s->flags;
666
667 if (s->busy)
668 us->subd_flags |= SDF_BUSY;
669 if (s->busy == file)
670 us->subd_flags |= SDF_BUSY_OWNER;
671 if (s->lock)
672 us->subd_flags |= SDF_LOCKED;
673 if (s->lock == file)
674 us->subd_flags |= SDF_LOCK_OWNER;
675 if (!s->maxdata && s->maxdata_list)
676 us->subd_flags |= SDF_MAXDATA;
677 if (s->flaglist)
678 us->subd_flags |= SDF_FLAGS;
679 if (s->range_table_list)
680 us->subd_flags |= SDF_RANGETYPE;
681 if (s->do_cmd)
682 us->subd_flags |= SDF_CMD;
683
684 if (s->insn_bits != &insn_inval)
685 us->insn_bits_support = COMEDI_SUPPORTED;
686 else
687 us->insn_bits_support = COMEDI_UNSUPPORTED;
688
689 us->settling_time_0 = s->settling_time_0;
690 }
691
692 ret = copy_to_user(arg, tmp,
bd52efbb 693 dev->n_subdevices * sizeof(struct comedi_subdinfo));
ed9eccbe
DS		 694
695 kfree(tmp);
696
697 return ret ? -EFAULT : 0;
698}
699
700/*
701 COMEDI_CHANINFO
702 subdevice info ioctl
703
704 arg:
705 pointer to chaninfo structure
706
707 reads:
708 chaninfo structure at arg
709
710 writes:
711 arrays at elements of chaninfo structure
712
713*/
0a85b6f0 714static int do_chaninfo_ioctl(struct comedi_device *dev,
92d0127c 715 struct comedi_chaninfo __user *arg)
ed9eccbe 716{
34c43922 717 struct comedi_subdevice *s;
a18b416d 718 struct comedi_chaninfo it;
ed9eccbe 719
a18b416d 720 if (copy_from_user(&it, arg, sizeof(struct comedi_chaninfo)))
ed9eccbe
DS		 721 return -EFAULT;
722
723 if (it.subdev >= dev->n_subdevices)
724 return -EINVAL;
b077f2cd 725 s = &dev->subdevices[it.subdev];
ed9eccbe
DS		 726
727 if (it.maxdata_list) {
728 if (s->maxdata || !s->maxdata_list)
729 return -EINVAL;
730 if (copy_to_user(it.maxdata_list, s->maxdata_list,
790c5541 731 s->n_chan * sizeof(unsigned int)))
ed9eccbe
DS		 732 return -EFAULT;
733 }
734
735 if (it.flaglist) {
736 if (!s->flaglist)
737 return -EINVAL;
738 if (copy_to_user(it.flaglist, s->flaglist,
476b8477 739 s->n_chan * sizeof(unsigned int)))
ed9eccbe
DS		 740 return -EFAULT;
741 }
742
743 if (it.rangelist) {
744 int i;
745
746 if (!s->range_table_list)
747 return -EINVAL;
748 for (i = 0; i < s->n_chan; i++) {
749 int x;
750
751 x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) |
476b8477 752 (s->range_table_list[i]->length);
81604d43
VK		 753 if (put_user(x, it.rangelist + i))
754 return -EFAULT;
ed9eccbe 755 }
476b8477
GKH		 756#if 0
757 if (copy_to_user(it.rangelist, s->range_type_list,
0a85b6f0 758 s->n_chan * sizeof(unsigned int)))
476b8477
GKH		 759 return -EFAULT;
760#endif
ed9eccbe
DS		 761 }
762
763 return 0;
764}
765
766 /*
767 COMEDI_BUFINFO
768 buffer information ioctl
769
770 arg:
771 pointer to bufinfo structure
772
773 reads:
774 bufinfo at arg
775
776 writes:
777 modified bufinfo at arg
778
779 */
92d0127c 780static int do_bufinfo_ioctl(struct comedi_device *dev,
53fa827e 781 struct comedi_bufinfo __user *arg, void *file)
ed9eccbe 782{
9aa5339a 783 struct comedi_bufinfo bi;
34c43922 784 struct comedi_subdevice *s;
d163679c 785 struct comedi_async *async;
ed9eccbe 786
9aa5339a 787 if (copy_from_user(&bi, arg, sizeof(struct comedi_bufinfo)))
ed9eccbe
DS		 788 return -EFAULT;
789
790 if (bi.subdevice >= dev->n_subdevices || bi.subdevice < 0)
791 return -EINVAL;
792
b077f2cd 793 s = &dev->subdevices[bi.subdevice];
53fa827e
IA		 794
795 if (s->lock && s->lock != file)
796 return -EACCES;
797
ed9eccbe
DS		 798 async = s->async;
799
800 if (!async) {
801 DPRINTK("subdevice does not have async capability\n");
802 bi.buf_write_ptr = 0;
803 bi.buf_read_ptr = 0;
804 bi.buf_write_count = 0;
805 bi.buf_read_count = 0;
4772c018
IA		 806 bi.bytes_read = 0;
807 bi.bytes_written = 0;
ed9eccbe
DS		 808 goto copyback;
809 }
53fa827e
IA		 810 if (!s->busy) {
811 bi.bytes_read = 0;
812 bi.bytes_written = 0;
813 goto copyback_position;
814 }
815 if (s->busy != file)
816 return -EACCES;
ed9eccbe
DS		 817
818 if (bi.bytes_read && (s->subdev_flags & SDF_CMD_READ)) {
819 bi.bytes_read = comedi_buf_read_alloc(async, bi.bytes_read);
820 comedi_buf_read_free(async, bi.bytes_read);
821
822 if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR |
476b8477
GKH		 823 SRF_RUNNING))
824 && async->buf_write_count == async->buf_read_count) {
ed9eccbe
DS		 825 do_become_nonbusy(dev, s);
826 }
827 }
828
829 if (bi.bytes_written && (s->subdev_flags & SDF_CMD_WRITE)) {
830 bi.bytes_written =
476b8477 831 comedi_buf_write_alloc(async, bi.bytes_written);
ed9eccbe
DS		 832 comedi_buf_write_free(async, bi.bytes_written);
833 }
834
53fa827e 835copyback_position:
ed9eccbe
DS		 836 bi.buf_write_count = async->buf_write_count;
837 bi.buf_write_ptr = async->buf_write_ptr;
838 bi.buf_read_count = async->buf_read_count;
839 bi.buf_read_ptr = async->buf_read_ptr;
840
476b8477 841copyback:
9aa5339a 842 if (copy_to_user(arg, &bi, sizeof(struct comedi_bufinfo)))
ed9eccbe
DS		 843 return -EFAULT;
844
845 return 0;
846}
847
0a85b6f0
MT		 848static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn,
849 unsigned int *data, void *file);
ed9eccbe 850/*
20617f22
PDP		 851 * COMEDI_INSNLIST
852 * synchronous instructions
ed9eccbe 853 *
20617f22
PDP		 854 * arg:
855 * pointer to sync cmd structure
ed9eccbe 856 *
20617f22
PDP		 857 * reads:
858 * sync cmd struct at arg
859 * instruction list
860 * data (for writes)
ed9eccbe 861 *
20617f22
PDP		 862 * writes:
863 * data (for reads)
ed9eccbe
DS		 864 */
865/* arbitrary limits */
866#define MAX_SAMPLES 256
92d0127c
GKH		 867static int do_insnlist_ioctl(struct comedi_device *dev,
868 struct comedi_insnlist __user *arg, void *file)
ed9eccbe 869{
da613f4f 870 struct comedi_insnlist insnlist;
90035c08 871 struct comedi_insn *insns = NULL;
790c5541 872 unsigned int *data = NULL;
ed9eccbe
DS		 873 int i = 0;
874 int ret = 0;
875
da613f4f 876 if (copy_from_user(&insnlist, arg, sizeof(struct comedi_insnlist)))
ed9eccbe
DS		 877 return -EFAULT;
878
790c5541 879 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL);
ed9eccbe
DS		 880 if (!data) {
881 DPRINTK("kmalloc failed\n");
882 ret = -ENOMEM;
883 goto error;
884 }
885
0a85b6f0 886 insns =
dfd8ee92 887 kcalloc(insnlist.n_insns, sizeof(struct comedi_insn), GFP_KERNEL);
ed9eccbe
DS		 888 if (!insns) {
889 DPRINTK("kmalloc failed\n");
890 ret = -ENOMEM;
891 goto error;
892 }
893
894 if (copy_from_user(insns, insnlist.insns,
90035c08 895 sizeof(struct comedi_insn) * insnlist.n_insns)) {
ed9eccbe
DS		 896 DPRINTK("copy_from_user failed\n");
897 ret = -EFAULT;
898 goto error;
899 }
900
901 for (i = 0; i < insnlist.n_insns; i++) {
902 if (insns[i].n > MAX_SAMPLES) {
903 DPRINTK("number of samples too large\n");
904 ret = -EINVAL;
905 goto error;
906 }
907 if (insns[i].insn & INSN_MASK_WRITE) {
908 if (copy_from_user(data, insns[i].data,
790c5541 909 insns[i].n * sizeof(unsigned int))) {
ed9eccbe
DS		 910 DPRINTK("copy_from_user failed\n");
911 ret = -EFAULT;
912 goto error;
913 }
914 }
915 ret = parse_insn(dev, insns + i, data, file);
916 if (ret < 0)
917 goto error;
918 if (insns[i].insn & INSN_MASK_READ) {
919 if (copy_to_user(insns[i].data, data,
790c5541 920 insns[i].n * sizeof(unsigned int))) {
ed9eccbe
DS		 921 DPRINTK("copy_to_user failed\n");
922 ret = -EFAULT;
923 goto error;
924 }
925 }
926 if (need_resched())
927 schedule();
928 }
929
476b8477
GKH		 930error:
931 kfree(insns);
932 kfree(data);
ed9eccbe
DS		 933
934 if (ret < 0)
935 return ret;
936 return i;
937}
938
0a85b6f0
MT		 939static int check_insn_config_length(struct comedi_insn *insn,
940 unsigned int *data)
ed9eccbe 941{
476b8477
GKH		 942 if (insn->n < 1)
943 return -EINVAL;
ed9eccbe
DS		 944
945 switch (data[0]) {
946 case INSN_CONFIG_DIO_OUTPUT:
947 case INSN_CONFIG_DIO_INPUT:
948 case INSN_CONFIG_DISARM:
949 case INSN_CONFIG_RESET:
950 if (insn->n == 1)
951 return 0;
952 break;
953 case INSN_CONFIG_ARM:
954 case INSN_CONFIG_DIO_QUERY:
955 case INSN_CONFIG_BLOCK_SIZE:
956 case INSN_CONFIG_FILTER:
957 case INSN_CONFIG_SERIAL_CLOCK:
958 case INSN_CONFIG_BIDIRECTIONAL_DATA:
959 case INSN_CONFIG_ALT_SOURCE:
960 case INSN_CONFIG_SET_COUNTER_MODE:
961 case INSN_CONFIG_8254_READ_STATUS:
962 case INSN_CONFIG_SET_ROUTING:
963 case INSN_CONFIG_GET_ROUTING:
964 case INSN_CONFIG_GET_PWM_STATUS:
965 case INSN_CONFIG_PWM_SET_PERIOD:
966 case INSN_CONFIG_PWM_GET_PERIOD:
967 if (insn->n == 2)
968 return 0;
969 break;
970 case INSN_CONFIG_SET_GATE_SRC:
971 case INSN_CONFIG_GET_GATE_SRC:
972 case INSN_CONFIG_SET_CLOCK_SRC:
973 case INSN_CONFIG_GET_CLOCK_SRC:
974 case INSN_CONFIG_SET_OTHER_SRC:
975 case INSN_CONFIG_GET_COUNTER_STATUS:
976 case INSN_CONFIG_PWM_SET_H_BRIDGE:
977 case INSN_CONFIG_PWM_GET_H_BRIDGE:
978 case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE:
979 if (insn->n == 3)
980 return 0;
981 break;
982 case INSN_CONFIG_PWM_OUTPUT:
983 case INSN_CONFIG_ANALOG_TRIG:
984 if (insn->n == 5)
985 return 0;
986 break;
b0a2b6d8
IA		 987 case INSN_CONFIG_DIGITAL_TRIG:
988 if (insn->n == 6)
989 return 0;
990 break;
0a85b6f0
MT		 991 /* by default we allow the insn since we don't have checks for
992 * all possible cases yet */
ed9eccbe 993 default:
4f870fe6
IA		 994 pr_warn("comedi: No check for data length of config insn id %i is implemented.\n",
995 data[0]);
996 pr_warn("comedi: Add a check to %s in %s.\n",
997 __func__, __FILE__);
998 pr_warn("comedi: Assuming n=%i is correct.\n", insn->n);
ed9eccbe 999 return 0;
ed9eccbe
DS		 1000 }
1001 return -EINVAL;
1002}
1003
0a85b6f0
MT		 1004static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn,
1005 unsigned int *data, void *file)
ed9eccbe 1006{
34c43922 1007 struct comedi_subdevice *s;
ed9eccbe
DS		 1008 int ret = 0;
1009 int i;
1010
1011 if (insn->insn & INSN_MASK_SPECIAL) {
1012 /* a non-subdevice instruction */
1013
1014 switch (insn->insn) {
1015 case INSN_GTOD:
1016 {
1017 struct timeval tv;
1018
1019 if (insn->n != 2) {
1020 ret = -EINVAL;
1021 break;
1022 }
1023
1024 do_gettimeofday(&tv);
1025 data[0] = tv.tv_sec;
1026 data[1] = tv.tv_usec;
1027 ret = 2;
1028
1029 break;
1030 }
1031 case INSN_WAIT:
1032 if (insn->n != 1 || data[0] >= 100000) {
1033 ret = -EINVAL;
1034 break;
1035 }
1036 udelay(data[0] / 1000);
1037 ret = 1;
1038 break;
1039 case INSN_INTTRIG:
1040 if (insn->n != 1) {
1041 ret = -EINVAL;
1042 break;
1043 }
1044 if (insn->subdev >= dev->n_subdevices) {
1045 DPRINTK("%d not usable subdevice\n",
1046 insn->subdev);
1047 ret = -EINVAL;
1048 break;
1049 }
b077f2cd 1050 s = &dev->subdevices[insn->subdev];
ed9eccbe
DS		 1051 if (!s->async) {
1052 DPRINTK("no async\n");
1053 ret = -EINVAL;
1054 break;
1055 }
1056 if (!s->async->inttrig) {
1057 DPRINTK("no inttrig\n");
1058 ret = -EAGAIN;
1059 break;
1060 }
5d06e3df 1061 ret = s->async->inttrig(dev, s, data[0]);
ed9eccbe
DS		 1062 if (ret >= 0)
1063 ret = 1;
1064 break;
1065 default:
1066 DPRINTK("invalid insn\n");
1067 ret = -EINVAL;
1068 break;
1069 }
1070 } else {
1071 /* a subdevice instruction */
790c5541 1072 unsigned int maxdata;
ed9eccbe
DS		 1073
1074 if (insn->subdev >= dev->n_subdevices) {
1075 DPRINTK("subdevice %d out of range\n", insn->subdev);
1076 ret = -EINVAL;
1077 goto out;
1078 }
b077f2cd 1079 s = &dev->subdevices[insn->subdev];
ed9eccbe
DS		 1080
1081 if (s->type == COMEDI_SUBD_UNUSED) {
1082 DPRINTK("%d not usable subdevice\n", insn->subdev);
1083 ret = -EIO;
1084 goto out;
1085 }
1086
1087 /* are we locked? (ioctl lock) */
1088 if (s->lock && s->lock != file) {
1089 DPRINTK("device locked\n");
1090 ret = -EACCES;
1091 goto out;
1092 }
1093
0fd0ca75 1094 ret = comedi_check_chanlist(s, 1, &insn->chanspec);
476b8477 1095 if (ret < 0) {
ed9eccbe
DS		 1096 ret = -EINVAL;
1097 DPRINTK("bad chanspec\n");
1098 goto out;
1099 }
1100
1101 if (s->busy) {
1102 ret = -EBUSY;
1103 goto out;
1104 }
1105 /* This looks arbitrary. It is. */
1106 s->busy = &parse_insn;
1107 switch (insn->insn) {
1108 case INSN_READ:
1109 ret = s->insn_read(dev, s, insn, data);
1110 break;
1111 case INSN_WRITE:
1112 maxdata = s->maxdata_list
476b8477
GKH		 1113 ? s->maxdata_list[CR_CHAN(insn->chanspec)]
1114 : s->maxdata;
ed9eccbe
DS		 1115 for (i = 0; i < insn->n; ++i) {
1116 if (data[i] > maxdata) {
1117 ret = -EINVAL;
1118 DPRINTK("bad data value(s)\n");
1119 break;
1120 }
1121 }
1122 if (ret == 0)
1123 ret = s->insn_write(dev, s, insn, data);
1124 break;
1125 case INSN_BITS:
1126 if (insn->n != 2) {
1127 ret = -EINVAL;
2f644ccf
IA		 1128 } else {
1129 /* Most drivers ignore the base channel in
1130 * insn->chanspec. Fix this here if
1131 * the subdevice has <= 32 channels. */
1132 unsigned int shift;
1133 unsigned int orig_mask;
1134
1135 orig_mask = data[0];
1136 if (s->n_chan <= 32) {
1137 shift = CR_CHAN(insn->chanspec);
1138 if (shift > 0) {
1139 insn->chanspec = 0;
1140 data[0] <<= shift;
1141 data[1] <<= shift;
1142 }
1143 } else
1144 shift = 0;
1145 ret = s->insn_bits(dev, s, insn, data);
1146 data[0] = orig_mask;
1147 if (shift > 0)
1148 data[1] >>= shift;
ed9eccbe 1149 }
ed9eccbe
DS		 1150 break;
1151 case INSN_CONFIG:
1152 ret = check_insn_config_length(insn, data);
1153 if (ret)
1154 break;
1155 ret = s->insn_config(dev, s, insn, data);
1156 break;
1157 default:
1158 ret = -EINVAL;
1159 break;
1160 }
1161
1162 s->busy = NULL;
1163 }
1164
476b8477 1165out:
ed9eccbe
DS		 1166 return ret;
1167}
1168
1169/*
20617f22
PDP		 1170 * COMEDI_INSN
1171 * synchronous instructions
ed9eccbe 1172 *
20617f22
PDP		 1173 * arg:
1174 * pointer to insn
ed9eccbe 1175 *
20617f22
PDP		 1176 * reads:
1177 * struct comedi_insn struct at arg
1178 * data (for writes)
ed9eccbe 1179 *
20617f22
PDP		 1180 * writes:
1181 * data (for reads)
ed9eccbe 1182 */
92d0127c
GKH		 1183static int do_insn_ioctl(struct comedi_device *dev,
1184 struct comedi_insn __user *arg, void *file)
ed9eccbe 1185{
90035c08 1186 struct comedi_insn insn;
790c5541 1187 unsigned int *data = NULL;
ed9eccbe
DS		 1188 int ret = 0;
1189
790c5541 1190 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL);
ed9eccbe
DS		 1191 if (!data) {
1192 ret = -ENOMEM;
1193 goto error;
1194 }
1195
90035c08 1196 if (copy_from_user(&insn, arg, sizeof(struct comedi_insn))) {
ed9eccbe
DS		 1197 ret = -EFAULT;
1198 goto error;
1199 }
1200
1201 /* This is where the behavior of insn and insnlist deviate. */
1202 if (insn.n > MAX_SAMPLES)
1203 insn.n = MAX_SAMPLES;
1204 if (insn.insn & INSN_MASK_WRITE) {
21fe2eea
M		 1205 if (copy_from_user(data,
1206 insn.data,
1207 insn.n * sizeof(unsigned int))) {
ed9eccbe
DS		 1208 ret = -EFAULT;
1209 goto error;
1210 }
1211 }
1212 ret = parse_insn(dev, &insn, data, file);
1213 if (ret < 0)
1214 goto error;
1215 if (insn.insn & INSN_MASK_READ) {
21fe2eea
M		 1216 if (copy_to_user(insn.data,
1217 data,
1218 insn.n * sizeof(unsigned int))) {
ed9eccbe
DS		 1219 ret = -EFAULT;
1220 goto error;
1221 }
1222 }
1223 ret = insn.n;
1224
476b8477
GKH		 1225error:
1226 kfree(data);
ed9eccbe
DS		 1227
1228 return ret;
1229}
1230
92d0127c 1231static int do_cmd_ioctl(struct comedi_device *dev,
cbe01f72 1232 struct comedi_cmd __user *arg, void *file)
ed9eccbe 1233{
88bc0574 1234 struct comedi_cmd cmd;
34c43922 1235 struct comedi_subdevice *s;
d163679c 1236 struct comedi_async *async;
ed9eccbe 1237 int ret = 0;
95bc359f 1238 unsigned int __user *user_chanlist;
ed9eccbe 1239
88bc0574 1240 if (copy_from_user(&cmd, arg, sizeof(struct comedi_cmd))) {
ed9eccbe
DS		 1241 DPRINTK("bad cmd address\n");
1242 return -EFAULT;
1243 }
476b8477 1244 /* save user's chanlist pointer so it can be restored later */
95bc359f 1245 user_chanlist = (unsigned int __user *)cmd.chanlist;
ed9eccbe 1246
88bc0574
HS		 1247 if (cmd.subdev >= dev->n_subdevices) {
1248 DPRINTK("%d no such subdevice\n", cmd.subdev);
ed9eccbe
DS		 1249 return -ENODEV;
1250 }
1251
88bc0574 1252 s = &dev->subdevices[cmd.subdev];
ed9eccbe
DS		 1253 async = s->async;
1254
1255 if (s->type == COMEDI_SUBD_UNUSED) {
88bc0574 1256 DPRINTK("%d not valid subdevice\n", cmd.subdev);
ed9eccbe
DS		 1257 return -EIO;
1258 }
1259
1260 if (!s->do_cmd || !s->do_cmdtest || !s->async) {
1261 DPRINTK("subdevice %i does not support commands\n",
88bc0574 1262 cmd.subdev);
ed9eccbe
DS		 1263 return -EIO;
1264 }
1265
1266 /* are we locked? (ioctl lock) */
1267 if (s->lock && s->lock != file) {
1268 DPRINTK("subdevice locked\n");
1269 return -EACCES;
1270 }
1271
1272 /* are we busy? */
1273 if (s->busy) {
1274 DPRINTK("subdevice busy\n");
1275 return -EBUSY;
1276 }
1277 s->busy = file;
1278
1279 /* make sure channel/gain list isn't too long */
88bc0574 1280 if (cmd.chanlist_len > s->len_chanlist) {
ed9eccbe 1281 DPRINTK("channel/gain list too long %u > %d\n",
88bc0574 1282 cmd.chanlist_len, s->len_chanlist);
ed9eccbe
DS		 1283 ret = -EINVAL;
1284 goto cleanup;
1285 }
1286
1287 /* make sure channel/gain list isn't too short */
88bc0574 1288 if (cmd.chanlist_len < 1) {
ed9eccbe 1289 DPRINTK("channel/gain list too short %u < 1\n",
88bc0574 1290 cmd.chanlist_len);
ed9eccbe
DS		 1291 ret = -EINVAL;
1292 goto cleanup;
1293 }
1294
88bc0574 1295 async->cmd = cmd;
ed9eccbe
DS		 1296 async->cmd.data = NULL;
1297 /* load channel/gain list */
1298 async->cmd.chanlist =
476b8477 1299 kmalloc(async->cmd.chanlist_len * sizeof(int), GFP_KERNEL);
ed9eccbe
DS		 1300 if (!async->cmd.chanlist) {
1301 DPRINTK("allocation failed\n");
1302 ret = -ENOMEM;
1303 goto cleanup;
1304 }
1305
95bc359f 1306 if (copy_from_user(async->cmd.chanlist, user_chanlist,
476b8477 1307 async->cmd.chanlist_len * sizeof(int))) {
ed9eccbe
DS		 1308 DPRINTK("fault reading chanlist\n");
1309 ret = -EFAULT;
1310 goto cleanup;
1311 }
1312
1313 /* make sure each element in channel/gain list is valid */
21fe2eea
M		 1314 ret = comedi_check_chanlist(s,
1315 async->cmd.chanlist_len,
1316 async->cmd.chanlist);
476b8477 1317 if (ret < 0) {
ed9eccbe
DS		 1318 DPRINTK("bad chanlist\n");
1319 goto cleanup;
1320 }
1321
1322 ret = s->do_cmdtest(dev, s, &async->cmd);
1323
1324 if (async->cmd.flags & TRIG_BOGUS || ret) {
1325 DPRINTK("test returned %d\n", ret);
88bc0574 1326 cmd = async->cmd;
476b8477 1327 /* restore chanlist pointer before copying back */
95bc359f 1328 cmd.chanlist = (unsigned int __force *)user_chanlist;
88bc0574
HS		 1329 cmd.data = NULL;
1330 if (copy_to_user(arg, &cmd, sizeof(struct comedi_cmd))) {
ed9eccbe
DS		 1331 DPRINTK("fault writing cmd\n");
1332 ret = -EFAULT;
1333 goto cleanup;
1334 }
1335 ret = -EAGAIN;
1336 goto cleanup;
1337 }
1338
1339 if (!async->prealloc_bufsz) {
1340 ret = -ENOMEM;
1341 DPRINTK("no buffer (?)\n");
1342 goto cleanup;
1343 }
1344
1345 comedi_reset_async_buf(async);
1346
1347 async->cb_mask =
476b8477
GKH		 1348 COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR |
1349 COMEDI_CB_OVERFLOW;
1350 if (async->cmd.flags & TRIG_WAKE_EOS)
ed9eccbe 1351 async->cb_mask |= COMEDI_CB_EOS;
ed9eccbe
DS		 1352
1353 comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING);
1354
ed9eccbe
DS		 1355 ret = s->do_cmd(dev, s);
1356 if (ret == 0)
1357 return 0;
1358
476b8477 1359cleanup:
ed9eccbe
DS		 1360 do_become_nonbusy(dev, s);
1361
1362 return ret;
1363}
1364
1365/*
1366 COMEDI_CMDTEST
1367 command testing ioctl
1368
1369 arg:
1370 pointer to cmd structure
1371
1372 reads:
1373 cmd structure at arg
1374 channel/range list
1375
1376 writes:
1377 modified cmd structure at arg
1378
1379*/
92d0127c
GKH		 1380static int do_cmdtest_ioctl(struct comedi_device *dev,
1381 struct comedi_cmd __user *arg, void *file)
ed9eccbe 1382{
f8348677 1383 struct comedi_cmd cmd;
34c43922 1384 struct comedi_subdevice *s;
ed9eccbe
DS		 1385 int ret = 0;
1386 unsigned int *chanlist = NULL;
95bc359f 1387 unsigned int __user *user_chanlist;
ed9eccbe 1388
f8348677 1389 if (copy_from_user(&cmd, arg, sizeof(struct comedi_cmd))) {
ed9eccbe
DS		 1390 DPRINTK("bad cmd address\n");
1391 return -EFAULT;
1392 }
476b8477 1393 /* save user's chanlist pointer so it can be restored later */
95bc359f 1394 user_chanlist = (unsigned int __user *)cmd.chanlist;
ed9eccbe 1395
f8348677
HS		 1396 if (cmd.subdev >= dev->n_subdevices) {
1397 DPRINTK("%d no such subdevice\n", cmd.subdev);
ed9eccbe
DS		 1398 return -ENODEV;
1399 }
1400
f8348677 1401 s = &dev->subdevices[cmd.subdev];
ed9eccbe 1402 if (s->type == COMEDI_SUBD_UNUSED) {
f8348677 1403 DPRINTK("%d not valid subdevice\n", cmd.subdev);
ed9eccbe
DS		 1404 return -EIO;
1405 }
1406
1407 if (!s->do_cmd || !s->do_cmdtest) {
1408 DPRINTK("subdevice %i does not support commands\n",
f8348677 1409 cmd.subdev);
ed9eccbe
DS		 1410 return -EIO;
1411 }
1412
1413 /* make sure channel/gain list isn't too long */
f8348677 1414 if (cmd.chanlist_len > s->len_chanlist) {
ed9eccbe 1415 DPRINTK("channel/gain list too long %d > %d\n",
f8348677 1416 cmd.chanlist_len, s->len_chanlist);
ed9eccbe
DS		 1417 ret = -EINVAL;
1418 goto cleanup;
1419 }
1420
1421 /* load channel/gain list */
f8348677 1422 if (cmd.chanlist) {
ed9eccbe 1423 chanlist =
f8348677 1424 kmalloc(cmd.chanlist_len * sizeof(int), GFP_KERNEL);
ed9eccbe
DS		 1425 if (!chanlist) {
1426 DPRINTK("allocation failed\n");
1427 ret = -ENOMEM;
1428 goto cleanup;
1429 }
1430
95bc359f 1431 if (copy_from_user(chanlist, user_chanlist,
f8348677 1432 cmd.chanlist_len * sizeof(int))) {
ed9eccbe
DS		 1433 DPRINTK("fault reading chanlist\n");
1434 ret = -EFAULT;
1435 goto cleanup;
1436 }
1437
1438 /* make sure each element in channel/gain list is valid */
f8348677 1439 ret = comedi_check_chanlist(s, cmd.chanlist_len, chanlist);
476b8477 1440 if (ret < 0) {
ed9eccbe
DS		 1441 DPRINTK("bad chanlist\n");
1442 goto cleanup;
1443 }
1444
f8348677 1445 cmd.chanlist = chanlist;
ed9eccbe
DS		 1446 }
1447
f8348677 1448 ret = s->do_cmdtest(dev, s, &cmd);
ed9eccbe 1449
476b8477 1450 /* restore chanlist pointer before copying back */
95bc359f 1451 cmd.chanlist = (unsigned int __force *)user_chanlist;
ed9eccbe 1452
f8348677 1453 if (copy_to_user(arg, &cmd, sizeof(struct comedi_cmd))) {
ed9eccbe
DS		 1454 DPRINTK("bad cmd address\n");
1455 ret = -EFAULT;
1456 goto cleanup;
1457 }
476b8477
GKH		 1458cleanup:
1459 kfree(chanlist);
ed9eccbe
DS		 1460
1461 return ret;
1462}
1463
1464/*
1465 COMEDI_LOCK
1466 lock subdevice
1467
1468 arg:
1469 subdevice number
1470
1471 reads:
1472 none
1473
1474 writes:
1475 none
1476
1477*/
1478
0a85b6f0
MT		 1479static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg,
1480 void *file)
ed9eccbe
DS		 1481{
1482 int ret = 0;
1483 unsigned long flags;
34c43922 1484 struct comedi_subdevice *s;
ed9eccbe
DS		 1485
1486 if (arg >= dev->n_subdevices)
1487 return -EINVAL;
b077f2cd 1488 s = &dev->subdevices[arg];
ed9eccbe 1489
5f74ea14 1490 spin_lock_irqsave(&s->spin_lock, flags);
476b8477 1491 if (s->busy || s->lock)
ed9eccbe 1492 ret = -EBUSY;
476b8477 1493 else
ed9eccbe 1494 s->lock = file;
5f74ea14 1495 spin_unlock_irqrestore(&s->spin_lock, flags);
ed9eccbe 1496
c5274ab0 1497#if 0
ed9eccbe
DS		 1498 if (ret < 0)
1499 return ret;
1500
ed9eccbe
DS		 1501 if (s->lock_f)
1502 ret = s->lock_f(dev, s);
1503#endif
1504
1505 return ret;
1506}
1507
1508/*
1509 COMEDI_UNLOCK
1510 unlock subdevice
1511
1512 arg:
1513 subdevice number
1514
1515 reads:
1516 none
1517
1518 writes:
1519 none
1520
1521 This function isn't protected by the semaphore, since
1522 we already own the lock.
1523*/
0a85b6f0
MT		 1524static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg,
1525 void *file)
ed9eccbe 1526{
34c43922 1527 struct comedi_subdevice *s;
ed9eccbe
DS		 1528
1529 if (arg >= dev->n_subdevices)
1530 return -EINVAL;
b077f2cd 1531 s = &dev->subdevices[arg];
ed9eccbe
DS		 1532
1533 if (s->busy)
1534 return -EBUSY;
1535
1536 if (s->lock && s->lock != file)
1537 return -EACCES;
1538
1539 if (s->lock == file) {
1540#if 0
1541 if (s->unlock)
1542 s->unlock(dev, s);
1543#endif
1544
1545 s->lock = NULL;
1546 }
1547
1548 return 0;
1549}
1550
1551/*
1552 COMEDI_CANCEL
1553 cancel acquisition ioctl
1554
1555 arg:
1556 subdevice number
1557
1558 reads:
1559 nothing
1560
1561 writes:
1562 nothing
1563
1564*/
0a85b6f0
MT		 1565static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg,
1566 void *file)
ed9eccbe 1567{
34c43922 1568 struct comedi_subdevice *s;
ed9eccbe
DS		 1569
1570 if (arg >= dev->n_subdevices)
1571 return -EINVAL;
b077f2cd 1572 s = &dev->subdevices[arg];
ed9eccbe
DS		 1573 if (s->async == NULL)
1574 return -EINVAL;
1575
1576 if (s->lock && s->lock != file)
1577 return -EACCES;
1578
1579 if (!s->busy)
1580 return 0;
1581
1582 if (s->busy != file)
1583 return -EBUSY;
1584
1585 return do_cancel(dev, s);
1586}
1587
1588/*
1589 COMEDI_POLL ioctl
1590 instructs driver to synchronize buffers
1591
1592 arg:
1593 subdevice number
1594
1595 reads:
1596 nothing
1597
1598 writes:
1599 nothing
1600
1601*/
0a85b6f0
MT		 1602static int do_poll_ioctl(struct comedi_device *dev, unsigned int arg,
1603 void *file)
ed9eccbe 1604{
34c43922 1605 struct comedi_subdevice *s;
ed9eccbe
DS		 1606
1607 if (arg >= dev->n_subdevices)
1608 return -EINVAL;
b077f2cd 1609 s = &dev->subdevices[arg];
ed9eccbe
DS		 1610
1611 if (s->lock && s->lock != file)
1612 return -EACCES;
1613
1614 if (!s->busy)
1615 return 0;
1616
1617 if (s->busy != file)
1618 return -EBUSY;
1619
1620 if (s->poll)
1621 return s->poll(dev, s);
1622
1623 return -EINVAL;
1624}
1625
47db6d58
HS		 1626static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd,
1627 unsigned long arg)
1628{
1629 const unsigned minor = iminor(file->f_dentry->d_inode);
4da5fa9a 1630 struct comedi_device *dev = comedi_dev_from_minor(minor);
47db6d58
HS		 1631 int rc;
1632
4da5fa9a 1633 if (!dev)
47db6d58 1634 return -ENODEV;
47db6d58
HS		 1635
1636 mutex_lock(&dev->mutex);
1637
1638 /* Device config is special, because it must work on
1639 * an unconfigured device. */
1640 if (cmd == COMEDI_DEVCONFIG) {
1641 rc = do_devconfig_ioctl(dev,
1642 (struct comedi_devconfig __user *)arg);
1643 goto done;
1644 }
1645
1646 if (!dev->attached) {
1647 DPRINTK("no driver configured on /dev/comedi%i\n", dev->minor);
1648 rc = -ENODEV;
1649 goto done;
1650 }
1651
1652 switch (cmd) {
1653 case COMEDI_BUFCONFIG:
1654 rc = do_bufconfig_ioctl(dev,
1655 (struct comedi_bufconfig __user *)arg);
1656 break;
1657 case COMEDI_DEVINFO:
1658 rc = do_devinfo_ioctl(dev, (struct comedi_devinfo __user *)arg,
1659 file);
1660 break;
1661 case COMEDI_SUBDINFO:
1662 rc = do_subdinfo_ioctl(dev,
1663 (struct comedi_subdinfo __user *)arg,
1664 file);
1665 break;
1666 case COMEDI_CHANINFO:
1667 rc = do_chaninfo_ioctl(dev, (void __user *)arg);
1668 break;
1669 case COMEDI_RANGEINFO:
1670 rc = do_rangeinfo_ioctl(dev, (void __user *)arg);
1671 break;
1672 case COMEDI_BUFINFO:
1673 rc = do_bufinfo_ioctl(dev,
1674 (struct comedi_bufinfo __user *)arg,
1675 file);
1676 break;
1677 case COMEDI_LOCK:
1678 rc = do_lock_ioctl(dev, arg, file);
1679 break;
1680 case COMEDI_UNLOCK:
1681 rc = do_unlock_ioctl(dev, arg, file);
1682 break;
1683 case COMEDI_CANCEL:
1684 rc = do_cancel_ioctl(dev, arg, file);
1685 break;
1686 case COMEDI_CMD:
1687 rc = do_cmd_ioctl(dev, (struct comedi_cmd __user *)arg, file);
1688 break;
1689 case COMEDI_CMDTEST:
1690 rc = do_cmdtest_ioctl(dev, (struct comedi_cmd __user *)arg,
1691 file);
1692 break;
1693 case COMEDI_INSNLIST:
1694 rc = do_insnlist_ioctl(dev,
1695 (struct comedi_insnlist __user *)arg,
1696 file);
1697 break;
1698 case COMEDI_INSN:
1699 rc = do_insn_ioctl(dev, (struct comedi_insn __user *)arg,
1700 file);
1701 break;
1702 case COMEDI_POLL:
1703 rc = do_poll_ioctl(dev, arg, file);
1704 break;
1705 default:
1706 rc = -ENOTTY;
1707 break;
1708 }
1709
1710done:
1711 mutex_unlock(&dev->mutex);
1712 return rc;
1713}
1714
df30b21c
FV		 1715static void comedi_vm_open(struct vm_area_struct *area)
1716{
1717 struct comedi_async *async;
1718 struct comedi_device *dev;
1719
1720 async = area->vm_private_data;
1721 dev = async->subdevice->device;
1722
1723 mutex_lock(&dev->mutex);
1724 async->mmap_count++;
1725 mutex_unlock(&dev->mutex);
1726}
1727
1728static void comedi_vm_close(struct vm_area_struct *area)
ed9eccbe 1729{
d163679c 1730 struct comedi_async *async;
71b5f4f1 1731 struct comedi_device *dev;
ed9eccbe
DS		 1732
1733 async = area->vm_private_data;
1734 dev = async->subdevice->device;
1735
1736 mutex_lock(&dev->mutex);
1737 async->mmap_count--;
1738 mutex_unlock(&dev->mutex);
1739}
1740
1741static struct vm_operations_struct comedi_vm_ops = {
df30b21c
FV		 1742 .open = comedi_vm_open,
1743 .close = comedi_vm_close,
ed9eccbe
DS		 1744};
1745
1746static int comedi_mmap(struct file *file, struct vm_area_struct *vma)
1747{
1748 const unsigned minor = iminor(file->f_dentry->d_inode);
d163679c 1749 struct comedi_async *async = NULL;
ed9eccbe
DS		 1750 unsigned long start = vma->vm_start;
1751 unsigned long size;
1752 int n_pages;
1753 int i;
1754 int retval;
34c43922 1755 struct comedi_subdevice *s;
3ffab428
BP		 1756 struct comedi_device_file_info *dev_file_info;
1757 struct comedi_device *dev;
1758
1759 dev_file_info = comedi_get_device_file_info(minor);
1760 if (dev_file_info == NULL)
70fe742c 1761 return -ENODEV;
3ffab428
BP		 1762 dev = dev_file_info->device;
1763 if (dev == NULL)
70fe742c 1764 return -ENODEV;
ed9eccbe
DS		 1765
1766 mutex_lock(&dev->mutex);
1767 if (!dev->attached) {
1768 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1769 retval = -ENODEV;
1770 goto done;
1771 }
476b8477 1772 if (vma->vm_flags & VM_WRITE)
ed9eccbe 1773 s = comedi_get_write_subdevice(dev_file_info);
476b8477 1774 else
ed9eccbe 1775 s = comedi_get_read_subdevice(dev_file_info);
476b8477 1776
ed9eccbe
DS		 1777 if (s == NULL) {
1778 retval = -EINVAL;
1779 goto done;
1780 }
1781 async = s->async;
1782 if (async == NULL) {
1783 retval = -EINVAL;
1784 goto done;
1785 }
1786
1787 if (vma->vm_pgoff != 0) {
1788 DPRINTK("comedi: mmap() offset must be 0.\n");
1789 retval = -EINVAL;
1790 goto done;
1791 }
1792
1793 size = vma->vm_end - vma->vm_start;
1794 if (size > async->prealloc_bufsz) {
1795 retval = -EFAULT;
1796 goto done;
1797 }
1798 if (size & (~PAGE_MASK)) {
1799 retval = -EFAULT;
1800 goto done;
1801 }
1802
1803 n_pages = size >> PAGE_SHIFT;
1804 for (i = 0; i < n_pages; ++i) {
1805 if (remap_pfn_range(vma, start,
0a85b6f0
MT		 1806 page_to_pfn(virt_to_page
1807 (async->buf_page_list
1808 [i].virt_addr)), PAGE_SIZE,
1809 PAGE_SHARED)) {
ed9eccbe
DS		 1810 retval = -EAGAIN;
1811 goto done;
1812 }
1813 start += PAGE_SIZE;
1814 }
1815
1816 vma->vm_ops = &comedi_vm_ops;
1817 vma->vm_private_data = async;
1818
1819 async->mmap_count++;
1820
1821 retval = 0;
476b8477 1822done:
ed9eccbe
DS		 1823 mutex_unlock(&dev->mutex);
1824 return retval;
1825}
1826
1ae5062a 1827static unsigned int comedi_poll(struct file *file, poll_table *wait)
ed9eccbe
DS		 1828{
1829 unsigned int mask = 0;
1830 const unsigned minor = iminor(file->f_dentry->d_inode);
34c43922
BP		 1831 struct comedi_subdevice *read_subdev;
1832 struct comedi_subdevice *write_subdev;
3ffab428
BP		 1833 struct comedi_device_file_info *dev_file_info;
1834 struct comedi_device *dev;
1835 dev_file_info = comedi_get_device_file_info(minor);
1836
1837 if (dev_file_info == NULL)
70fe742c 1838 return -ENODEV;
3ffab428
BP		 1839 dev = dev_file_info->device;
1840 if (dev == NULL)
70fe742c 1841 return -ENODEV;
ed9eccbe
DS		 1842
1843 mutex_lock(&dev->mutex);
1844 if (!dev->attached) {
1845 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1846 mutex_unlock(&dev->mutex);
1847 return 0;
1848 }
1849
1850 mask = 0;
1851 read_subdev = comedi_get_read_subdevice(dev_file_info);
1852 if (read_subdev) {
1853 poll_wait(file, &read_subdev->async->wait_head, wait);
1854 if (!read_subdev->busy
476b8477
GKH		 1855 || comedi_buf_read_n_available(read_subdev->async) > 0
1856 || !(comedi_get_subdevice_runflags(read_subdev) &
1857 SRF_RUNNING)) {
ed9eccbe
DS		 1858 mask |= POLLIN | POLLRDNORM;
1859 }
1860 }
1861 write_subdev = comedi_get_write_subdevice(dev_file_info);
1862 if (write_subdev) {
1863 poll_wait(file, &write_subdev->async->wait_head, wait);
476b8477
GKH		 1864 comedi_buf_write_alloc(write_subdev->async,
1865 write_subdev->async->prealloc_bufsz);
ed9eccbe 1866 if (!write_subdev->busy
476b8477
GKH		 1867 || !(comedi_get_subdevice_runflags(write_subdev) &
1868 SRF_RUNNING)
1869 || comedi_buf_write_n_allocated(write_subdev->async) >=
1870 bytes_per_sample(write_subdev->async->subdevice)) {
ed9eccbe
DS		 1871 mask |= POLLOUT | POLLWRNORM;
1872 }
1873 }
1874
1875 mutex_unlock(&dev->mutex);
1876 return mask;
1877}
1878
92d0127c
GKH		 1879static ssize_t comedi_write(struct file *file, const char __user *buf,
1880 size_t nbytes, loff_t *offset)
ed9eccbe 1881{
34c43922 1882 struct comedi_subdevice *s;
d163679c 1883 struct comedi_async *async;
ed9eccbe
DS		 1884 int n, m, count = 0, retval = 0;
1885 DECLARE_WAITQUEUE(wait, current);
1886 const unsigned minor = iminor(file->f_dentry->d_inode);
3ffab428
BP		 1887 struct comedi_device_file_info *dev_file_info;
1888 struct comedi_device *dev;
1889 dev_file_info = comedi_get_device_file_info(minor);
1890
1891 if (dev_file_info == NULL)
70fe742c 1892 return -ENODEV;
3ffab428
BP		 1893 dev = dev_file_info->device;
1894 if (dev == NULL)
70fe742c 1895 return -ENODEV;
ed9eccbe
DS		 1896
1897 if (!dev->attached) {
1898 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1899 retval = -ENODEV;
1900 goto done;
1901 }
1902
1903 s = comedi_get_write_subdevice(dev_file_info);
1904 if (s == NULL) {
1905 retval = -EIO;
1906 goto done;
1907 }
1908 async = s->async;
1909
1910 if (!nbytes) {
1911 retval = 0;
1912 goto done;
1913 }
1914 if (!s->busy) {
1915 retval = 0;
1916 goto done;
1917 }
1918 if (s->busy != file) {
1919 retval = -EACCES;
1920 goto done;
1921 }
1922 add_wait_queue(&async->wait_head, &wait);
1923 while (nbytes > 0 && !retval) {
1924 set_current_state(TASK_INTERRUPTIBLE);
1925
d2611540
IA		 1926 if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) {
1927 if (count == 0) {
1928 if (comedi_get_subdevice_runflags(s) &
1929 SRF_ERROR) {
1930 retval = -EPIPE;
1931 } else {
1932 retval = 0;
1933 }
1934 do_become_nonbusy(dev, s);
1935 }
1936 break;
1937 }
1938
ed9eccbe
DS		 1939 n = nbytes;
1940
1941 m = n;
476b8477 1942 if (async->buf_write_ptr + m > async->prealloc_bufsz)
ed9eccbe 1943 m = async->prealloc_bufsz - async->buf_write_ptr;
ed9eccbe 1944 comedi_buf_write_alloc(async, async->prealloc_bufsz);
476b8477 1945 if (m > comedi_buf_write_n_allocated(async))
ed9eccbe 1946 m = comedi_buf_write_n_allocated(async);
ed9eccbe
DS		 1947 if (m < n)
1948 n = m;
1949
1950 if (n == 0) {
ed9eccbe
DS		 1951 if (file->f_flags & O_NONBLOCK) {
1952 retval = -EAGAIN;
1953 break;
1954 }
6a9ce6b6 1955 schedule();
ed9eccbe
DS		 1956 if (signal_pending(current)) {
1957 retval = -ERESTARTSYS;
1958 break;
1959 }
476b8477 1960 if (!s->busy)
ed9eccbe 1961 break;
ed9eccbe
DS		 1962 if (s->busy != file) {
1963 retval = -EACCES;
1964 break;
1965 }
1966 continue;
1967 }
1968
1969 m = copy_from_user(async->prealloc_buf + async->buf_write_ptr,
476b8477 1970 buf, n);
ed9eccbe
DS		 1971 if (m) {
1972 n -= m;
1973 retval = -EFAULT;
1974 }
1975 comedi_buf_write_free(async, n);
1976
1977 count += n;
1978 nbytes -= n;
1979
1980 buf += n;
1981 break; /* makes device work like a pipe */
1982 }
1983 set_current_state(TASK_RUNNING);
1984 remove_wait_queue(&async->wait_head, &wait);
1985
1986done:
476b8477 1987 return count ? count : retval;
ed9eccbe
DS		 1988}
1989
92d0127c 1990static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes,
6705b68d 1991 loff_t *offset)
ed9eccbe 1992{
34c43922 1993 struct comedi_subdevice *s;
d163679c 1994 struct comedi_async *async;
ed9eccbe
DS		 1995 int n, m, count = 0, retval = 0;
1996 DECLARE_WAITQUEUE(wait, current);
1997 const unsigned minor = iminor(file->f_dentry->d_inode);
3ffab428
BP		 1998 struct comedi_device_file_info *dev_file_info;
1999 struct comedi_device *dev;
2000 dev_file_info = comedi_get_device_file_info(minor);
2001
2002 if (dev_file_info == NULL)
70fe742c 2003 return -ENODEV;
3ffab428
BP		 2004 dev = dev_file_info->device;
2005 if (dev == NULL)
70fe742c 2006 return -ENODEV;
ed9eccbe
DS		 2007
2008 if (!dev->attached) {
2009 DPRINTK("no driver configured on comedi%i\n", dev->minor);
2010 retval = -ENODEV;
2011 goto done;
2012 }
2013
2014 s = comedi_get_read_subdevice(dev_file_info);
2015 if (s == NULL) {
2016 retval = -EIO;
2017 goto done;
2018 }
2019 async = s->async;
2020 if (!nbytes) {
2021 retval = 0;
2022 goto done;
2023 }
2024 if (!s->busy) {
2025 retval = 0;
2026 goto done;
2027 }
2028 if (s->busy != file) {
2029 retval = -EACCES;
2030 goto done;
2031 }
2032
2033 add_wait_queue(&async->wait_head, &wait);
2034 while (nbytes > 0 && !retval) {
2035 set_current_state(TASK_INTERRUPTIBLE);
2036
2037 n = nbytes;
2038
2039 m = comedi_buf_read_n_available(async);
476b8477
GKH		 2040 /* printk("%d available\n",m); */
2041 if (async->buf_read_ptr + m > async->prealloc_bufsz)
ed9eccbe 2042 m = async->prealloc_bufsz - async->buf_read_ptr;
476b8477 2043 /* printk("%d contiguous\n",m); */
ed9eccbe
DS		 2044 if (m < n)
2045 n = m;
2046
2047 if (n == 0) {
2048 if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) {
2049 do_become_nonbusy(dev, s);
2050 if (comedi_get_subdevice_runflags(s) &
476b8477 2051 SRF_ERROR) {
ed9eccbe
DS		 2052 retval = -EPIPE;
2053 } else {
2054 retval = 0;
2055 }
2056 break;
2057 }
2058 if (file->f_flags & O_NONBLOCK) {
2059 retval = -EAGAIN;
2060 break;
2061 }
6a9ce6b6 2062 schedule();
ed9eccbe
DS		 2063 if (signal_pending(current)) {
2064 retval = -ERESTARTSYS;
2065 break;
2066 }
ed9eccbe
DS		 2067 if (!s->busy) {
2068 retval = 0;
2069 break;
2070 }
2071 if (s->busy != file) {
2072 retval = -EACCES;
2073 break;
2074 }
2075 continue;
2076 }
2077 m = copy_to_user(buf, async->prealloc_buf +
476b8477 2078 async->buf_read_ptr, n);
ed9eccbe
DS		 2079 if (m) {
2080 n -= m;
2081 retval = -EFAULT;
2082 }
2083
2084 comedi_buf_read_alloc(async, n);
2085 comedi_buf_read_free(async, n);
2086
2087 count += n;
2088 nbytes -= n;
2089
2090 buf += n;
2091 break; /* makes device work like a pipe */
2092 }
2093 if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | SRF_RUNNING)) &&
476b8477 2094 async->buf_read_count - async->buf_write_count == 0) {
ed9eccbe
DS		 2095 do_become_nonbusy(dev, s);
2096 }
2097 set_current_state(TASK_RUNNING);
2098 remove_wait_queue(&async->wait_head, &wait);
2099
2100done:
476b8477 2101 return count ? count : retval;
ed9eccbe
DS		 2102}
2103
ed9eccbe
DS		 2104static int comedi_open(struct inode *inode, struct file *file)
2105{
ed9eccbe 2106 const unsigned minor = iminor(inode);
4da5fa9a 2107 struct comedi_device *dev = comedi_dev_from_minor(minor);
97920071 2108
4da5fa9a 2109 if (!dev) {
ed9eccbe
DS		 2110 DPRINTK("invalid minor number\n");
2111 return -ENODEV;
2112 }
2113
2114 /* This is slightly hacky, but we want module autoloading
2115 * to work for root.
2116 * case: user opens device, attached -> ok
2117 * case: user opens device, unattached, in_request_module=0 -> autoload
2118 * case: user opens device, unattached, in_request_module=1 -> fail
2119 * case: root opens device, attached -> ok
2120 * case: root opens device, unattached, in_request_module=1 -> ok
2121 * (typically called from modprobe)
2122 * case: root opens device, unattached, in_request_module=0 -> autoload
2123 *
2124 * The last could be changed to "-> ok", which would deny root
2125 * autoloading.
2126 */
2127 mutex_lock(&dev->mutex);
2128 if (dev->attached)
2129 goto ok;
a8f80e8f 2130 if (!capable(CAP_NET_ADMIN) && dev->in_request_module) {
ed9eccbe
DS		 2131 DPRINTK("in request module\n");
2132 mutex_unlock(&dev->mutex);
2133 return -ENODEV;
2134 }
a8f80e8f 2135 if (capable(CAP_NET_ADMIN) && dev->in_request_module)
ed9eccbe
DS		 2136 goto ok;
2137
2138 dev->in_request_module = 1;
2139
ed9eccbe
DS		 2140#ifdef CONFIG_KMOD
2141 mutex_unlock(&dev->mutex);
56d92c60 2142 request_module("char-major-%i-%i", COMEDI_MAJOR, dev->minor);
ed9eccbe
DS		 2143 mutex_lock(&dev->mutex);
2144#endif
2145
2146 dev->in_request_module = 0;
2147
a8f80e8f
EP		 2148 if (!dev->attached && !capable(CAP_NET_ADMIN)) {
2149 DPRINTK("not attached and not CAP_NET_ADMIN\n");
ed9eccbe
DS		 2150 mutex_unlock(&dev->mutex);
2151 return -ENODEV;
2152 }
2153ok:
2154 __module_get(THIS_MODULE);
2155
2156 if (dev->attached) {
2157 if (!try_module_get(dev->driver->module)) {
2158 module_put(THIS_MODULE);
2159 mutex_unlock(&dev->mutex);
2160 return -ENOSYS;
2161 }
2162 }
2163
3c17ba07
IA		 2164 if (dev->attached && dev->use_count == 0 && dev->open) {
2165 int rc = dev->open(dev);
2166 if (rc < 0) {
2167 module_put(dev->driver->module);
2168 module_put(THIS_MODULE);
2169 mutex_unlock(&dev->mutex);
2170 return rc;
2171 }
2172 }
ed9eccbe
DS		 2173
2174 dev->use_count++;
2175
a5011a26 2176 mutex_unlock(&dev->mutex);
ed9eccbe 2177
a5011a26 2178 return 0;
ed9eccbe
DS		 2179}
2180
2aae0076
HS		 2181static int comedi_fasync(int fd, struct file *file, int on)
2182{
2183 const unsigned minor = iminor(file->f_dentry->d_inode);
4da5fa9a 2184 struct comedi_device *dev = comedi_dev_from_minor(minor);
2aae0076 2185
4da5fa9a 2186 if (!dev)
2aae0076
HS		 2187 return -ENODEV;
2188
2189 return fasync_helper(fd, file, on, &dev->async_queue);
2190}
2191
a5011a26 2192static int comedi_close(struct inode *inode, struct file *file)
ed9eccbe 2193{
a5011a26 2194 const unsigned minor = iminor(inode);
4da5fa9a 2195 struct comedi_device *dev = comedi_dev_from_minor(minor);
a5011a26 2196 struct comedi_subdevice *s = NULL;
ed9eccbe
DS		 2197 int i;
2198
4da5fa9a 2199 if (!dev)
a5011a26 2200 return -ENODEV;
ed9eccbe 2201
a5011a26
HS		 2202 mutex_lock(&dev->mutex);
2203
2204 if (dev->subdevices) {
2205 for (i = 0; i < dev->n_subdevices; i++) {
b077f2cd 2206 s = &dev->subdevices[i];
a5011a26
HS		 2207
2208 if (s->busy == file)
2209 do_cancel(dev, s);
2210 if (s->lock == file)
2211 s->lock = NULL;
2212 }
ed9eccbe 2213 }
a5011a26
HS		 2214 if (dev->attached && dev->use_count == 1 && dev->close)
2215 dev->close(dev);
2216
2217 module_put(THIS_MODULE);
2218 if (dev->attached)
2219 module_put(dev->driver->module);
2220
2221 dev->use_count--;
2222
2223 mutex_unlock(&dev->mutex);
2224
2225 if (file->f_flags & FASYNC)
2226 comedi_fasync(-1, file, 0);
ed9eccbe
DS		 2227
2228 return 0;
2229}
2230
8cb8aad7 2231static const struct file_operations comedi_fops = {
a5011a26
HS		 2232 .owner = THIS_MODULE,
2233 .unlocked_ioctl = comedi_unlocked_ioctl,
2234 .compat_ioctl = comedi_compat_ioctl,
2235 .open = comedi_open,
2236 .release = comedi_close,
2237 .read = comedi_read,
2238 .write = comedi_write,
2239 .mmap = comedi_mmap,
2240 .poll = comedi_poll,
2241 .fasync = comedi_fasync,
2242 .llseek = noop_llseek,
2243};
2244
8cb8aad7 2245static struct class *comedi_class;
a5011a26
HS		 2246static struct cdev comedi_cdev;
2247
2248static void comedi_cleanup_legacy_minors(void)
ed9eccbe 2249{
ed9eccbe
DS		 2250 unsigned i;
2251
a5011a26 2252 for (i = 0; i < comedi_num_legacy_minors; i++)
883db3d9 2253 comedi_free_board_minor(i);
ed9eccbe
DS		 2254}
2255
a5011a26 2256static int __init comedi_init(void)
ed9eccbe 2257{
a5011a26
HS		 2258 int i;
2259 int retval;
ed9eccbe 2260
4f870fe6 2261 pr_info("comedi: version " COMEDI_RELEASE " - http://www.comedi.org\n");
ed9eccbe 2262
a5011a26
HS		 2263 if (comedi_num_legacy_minors < 0 ||
2264 comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) {
4f870fe6
IA		 2265 pr_err("comedi: error: invalid value for module parameter \"comedi_num_legacy_minors\". Valid values are 0 through %i.\n",
2266 COMEDI_NUM_BOARD_MINORS);
a5011a26 2267 return -EINVAL;
ed9eccbe 2268 }
c43435d7 2269
a5011a26
HS		 2270 /*
2271 * comedi is unusable if both comedi_autoconfig and
2272 * comedi_num_legacy_minors are zero, so we might as well adjust the
2273 * defaults in that case
2274 */
2275 if (comedi_autoconfig == 0 && comedi_num_legacy_minors == 0)
2276 comedi_num_legacy_minors = 16;
c43435d7 2277
a5011a26
HS		 2278 memset(comedi_file_info_table, 0,
2279 sizeof(struct comedi_device_file_info *) * COMEDI_NUM_MINORS);
ed9eccbe 2280
a5011a26
HS		 2281 retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2282 COMEDI_NUM_MINORS, "comedi");
2283 if (retval)
2284 return -EIO;
2285 cdev_init(&comedi_cdev, &comedi_fops);
2286 comedi_cdev.owner = THIS_MODULE;
2287 kobject_set_name(&comedi_cdev.kobj, "comedi");
2288 if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) {
2289 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2290 COMEDI_NUM_MINORS);
2291 return -EIO;
883db3d9 2292 }
a5011a26
HS		 2293 comedi_class = class_create(THIS_MODULE, "comedi");
2294 if (IS_ERR(comedi_class)) {
4f870fe6 2295 pr_err("comedi: failed to create class\n");
a5011a26
HS		 2296 cdev_del(&comedi_cdev);
2297 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2298 COMEDI_NUM_MINORS);
2299 return PTR_ERR(comedi_class);
883db3d9 2300 }
a5011a26 2301
fb60367d
HS		 2302 comedi_class->dev_attrs = comedi_dev_attrs;
2303
a5011a26
HS		 2304 /* XXX requires /proc interface */
2305 comedi_proc_init();
2306
2307 /* create devices files for legacy/manual use */
2308 for (i = 0; i < comedi_num_legacy_minors; i++) {
2309 int minor;
2310 minor = comedi_alloc_board_minor(NULL);
2311 if (minor < 0) {
2312 comedi_cleanup_legacy_minors();
2313 cdev_del(&comedi_cdev);
2314 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2315 COMEDI_NUM_MINORS);
2316 return minor;
2317 }
883db3d9 2318 }
a5011a26
HS		 2319
2320 return 0;
ed9eccbe
DS		 2321}
2322
a5011a26 2323static void __exit comedi_cleanup(void)
ed9eccbe 2324{
a5011a26 2325 int i;
ed9eccbe 2326
a5011a26
HS		 2327 comedi_cleanup_legacy_minors();
2328 for (i = 0; i < COMEDI_NUM_MINORS; ++i)
2329 BUG_ON(comedi_file_info_table[i]);
ed9eccbe 2330
a5011a26
HS		 2331 class_destroy(comedi_class);
2332 cdev_del(&comedi_cdev);
2333 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS);
ed9eccbe 2334
a5011a26 2335 comedi_proc_cleanup();
ed9eccbe
DS		 2336}
2337
a5011a26
HS		 2338module_init(comedi_init);
2339module_exit(comedi_cleanup);
ed9eccbe 2340
a5011a26
HS		 2341void comedi_error(const struct comedi_device *dev, const char *s)
2342{
4f870fe6 2343 dev_err(dev->class_dev, "%s: %s\n", dev->driver->driver_name, s);
ed9eccbe 2344}
a5011a26 2345EXPORT_SYMBOL(comedi_error);
883db3d9 2346
a5011a26 2347void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s)
883db3d9 2348{
a5011a26
HS		 2349 struct comedi_async *async = s->async;
2350 unsigned runflags = 0;
2351 unsigned runflags_mask = 0;
883db3d9 2352
a5011a26 2353 /* DPRINTK("comedi_event 0x%x\n",mask); */
883db3d9 2354
a5011a26
HS		 2355 if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) == 0)
2356 return;
2357
2358 if (s->
2359 async->events & (COMEDI_CB_EOA | COMEDI_CB_ERROR |
2360 COMEDI_CB_OVERFLOW)) {
2361 runflags_mask |= SRF_RUNNING;
883db3d9 2362 }
a5011a26
HS		 2363 /* remember if an error event has occurred, so an error
2364 * can be returned the next time the user does a read() */
2365 if (s->async->events & (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) {
2366 runflags_mask |= SRF_ERROR;
2367 runflags |= SRF_ERROR;
883db3d9 2368 }
a5011a26
HS		 2369 if (runflags_mask) {
2370 /*sets SRF_ERROR and SRF_RUNNING together atomically */
2371 comedi_set_subdevice_runflags(s, runflags_mask, runflags);
883db3d9
FMH		 2372 }
2373
a5011a26
HS		 2374 if (async->cb_mask & s->async->events) {
2375 if (comedi_get_subdevice_runflags(s) & SRF_USER) {
2376 wake_up_interruptible(&async->wait_head);
2377 if (s->subdev_flags & SDF_CMD_READ)
2378 kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
2379 if (s->subdev_flags & SDF_CMD_WRITE)
2380 kill_fasync(&dev->async_queue, SIGIO, POLL_OUT);
2381 } else {
2382 if (async->cb_func)
2383 async->cb_func(s->async->events, async->cb_arg);
2384 }
2385 }
2386 s->async->events = 0;
883db3d9 2387}
a5011a26 2388EXPORT_SYMBOL(comedi_event);
883db3d9 2389
a5011a26 2390unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s)
883db3d9 2391{
a5011a26
HS		 2392 unsigned long flags;
2393 unsigned runflags;
883db3d9 2394
a5011a26
HS		 2395 spin_lock_irqsave(&s->spin_lock, flags);
2396 runflags = s->runflags;
2397 spin_unlock_irqrestore(&s->spin_lock, flags);
2398 return runflags;
883db3d9 2399}
a5011a26 2400EXPORT_SYMBOL(comedi_get_subdevice_runflags);
883db3d9 2401
a5011a26
HS		 2402static void comedi_device_init(struct comedi_device *dev)
2403{
2404 memset(dev, 0, sizeof(struct comedi_device));
2405 spin_lock_init(&dev->spinlock);
2406 mutex_init(&dev->mutex);
2407 dev->minor = -1;
2408}
883db3d9 2409
a5011a26 2410static void comedi_device_cleanup(struct comedi_device *dev)
883db3d9 2411{
a5011a26
HS		 2412 if (dev == NULL)
2413 return;
2414 mutex_lock(&dev->mutex);
2415 comedi_device_detach(dev);
2416 mutex_unlock(&dev->mutex);
2417 mutex_destroy(&dev->mutex);
2418}
2419
2420int comedi_alloc_board_minor(struct device *hardware_device)
2421{
2422 struct comedi_device_file_info *info;
2423 struct device *csdev;
2424 unsigned i;
a5011a26
HS		 2425
2426 info = kzalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL);
2427 if (info == NULL)
2428 return -ENOMEM;
2429 info->device = kzalloc(sizeof(struct comedi_device), GFP_KERNEL);
2430 if (info->device == NULL) {
2431 kfree(info);
2432 return -ENOMEM;
2433 }
2434 info->hardware_device = hardware_device;
2435 comedi_device_init(info->device);
2436 spin_lock(&comedi_file_info_table_lock);
2437 for (i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i) {
2438 if (comedi_file_info_table[i] == NULL) {
2439 comedi_file_info_table[i] = info;
2440 break;
2441 }
2442 }
2443 spin_unlock(&comedi_file_info_table_lock);
2444 if (i == COMEDI_NUM_BOARD_MINORS) {
2445 comedi_device_cleanup(info->device);
2446 kfree(info->device);
2447 kfree(info);
4f870fe6 2448 pr_err("comedi: error: ran out of minor numbers for board device files.\n");
a5011a26
HS		 2449 return -EBUSY;
2450 }
2451 info->device->minor = i;
2452 csdev = device_create(comedi_class, hardware_device,
2453 MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i", i);
2454 if (!IS_ERR(csdev))
2455 info->device->class_dev = csdev;
2456 dev_set_drvdata(csdev, info);
883db3d9 2457
a5011a26 2458 return i;
883db3d9
FMH		 2459}
2460
a5011a26 2461void comedi_free_board_minor(unsigned minor)
883db3d9 2462{
a5011a26 2463 struct comedi_device_file_info *info;
883db3d9 2464
a5011a26
HS		 2465 BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS);
2466 spin_lock(&comedi_file_info_table_lock);
2467 info = comedi_file_info_table[minor];
2468 comedi_file_info_table[minor] = NULL;
2469 spin_unlock(&comedi_file_info_table_lock);
883db3d9 2470
a5011a26
HS		 2471 if (info) {
2472 struct comedi_device *dev = info->device;
2473 if (dev) {
2474 if (dev->class_dev) {
2475 device_destroy(comedi_class,
2476 MKDEV(COMEDI_MAJOR, dev->minor));
2477 }
2478 comedi_device_cleanup(dev);
2479 kfree(dev);
2480 }
2481 kfree(info);
883db3d9 2482 }
883db3d9
FMH		 2483}
2484
a5011a26 2485int comedi_find_board_minor(struct device *hardware_device)
883db3d9 2486{
a5011a26
HS		 2487 int minor;
2488 struct comedi_device_file_info *info;
883db3d9 2489
a5011a26
HS		 2490 for (minor = 0; minor < COMEDI_NUM_BOARD_MINORS; minor++) {
2491 spin_lock(&comedi_file_info_table_lock);
2492 info = comedi_file_info_table[minor];
2493 if (info && info->hardware_device == hardware_device) {
2494 spin_unlock(&comedi_file_info_table_lock);
2495 return minor;
2496 }
2497 spin_unlock(&comedi_file_info_table_lock);
883db3d9 2498 }
a5011a26 2499 return -ENODEV;
883db3d9
FMH		 2500}
2501
a5011a26
HS		 2502int comedi_alloc_subdevice_minor(struct comedi_device *dev,
2503 struct comedi_subdevice *s)
883db3d9 2504{
a5011a26
HS		 2505 struct comedi_device_file_info *info;
2506 struct device *csdev;
2507 unsigned i;
883db3d9 2508
a5011a26
HS		 2509 info = kmalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL);
2510 if (info == NULL)
2511 return -ENOMEM;
2512 info->device = dev;
2513 info->read_subdevice = s;
2514 info->write_subdevice = s;
2515 spin_lock(&comedi_file_info_table_lock);
2516 for (i = COMEDI_FIRST_SUBDEVICE_MINOR; i < COMEDI_NUM_MINORS; ++i) {
2517 if (comedi_file_info_table[i] == NULL) {
2518 comedi_file_info_table[i] = info;
2519 break;
2520 }
2521 }
2522 spin_unlock(&comedi_file_info_table_lock);
2523 if (i == COMEDI_NUM_MINORS) {
2524 kfree(info);
4f870fe6 2525 pr_err("comedi: error: ran out of minor numbers for board device files.\n");
a5011a26
HS		 2526 return -EBUSY;
2527 }
2528 s->minor = i;
2529 csdev = device_create(comedi_class, dev->class_dev,
2530 MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i_subd%i",
2531 dev->minor, (int)(s - dev->subdevices));
2532 if (!IS_ERR(csdev))
2533 s->class_dev = csdev;
2534 dev_set_drvdata(csdev, info);
883db3d9 2535
a5011a26 2536 return i;
883db3d9
FMH		 2537}
2538
a5011a26 2539void comedi_free_subdevice_minor(struct comedi_subdevice *s)
883db3d9 2540{
a5011a26 2541 struct comedi_device_file_info *info;
883db3d9 2542
a5011a26
HS		 2543 if (s == NULL)
2544 return;
2545 if (s->minor < 0)
2546 return;
883db3d9 2547
a5011a26
HS		 2548 BUG_ON(s->minor >= COMEDI_NUM_MINORS);
2549 BUG_ON(s->minor < COMEDI_FIRST_SUBDEVICE_MINOR);
883db3d9 2550
a5011a26
HS		 2551 spin_lock(&comedi_file_info_table_lock);
2552 info = comedi_file_info_table[s->minor];
2553 comedi_file_info_table[s->minor] = NULL;
2554 spin_unlock(&comedi_file_info_table_lock);
883db3d9 2555
a5011a26
HS		 2556 if (s->class_dev) {
2557 device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor));
2558 s->class_dev = NULL;
883db3d9 2559 }
a5011a26 2560 kfree(info);
883db3d9 2561}
Linux kernel - Deliverables
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