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Staging: csr: provide a MODULE_LICENSE for csr_helper.ko
[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
26#define __NO_VERSION__
27#include "comedi_fops.h"
28#include "comedi_compat32.h"
29
30#include <linux/module.h>
31#include <linux/errno.h>
32#include <linux/kernel.h>
33#include <linux/sched.h>
34#include <linux/fcntl.h>
35#include <linux/delay.h>
36#include <linux/ioport.h>
37#include <linux/mm.h>
38#include <linux/slab.h>
39#include <linux/kmod.h>
40#include <linux/poll.h>
41#include <linux/init.h>
42#include <linux/device.h>
43#include <linux/vmalloc.h>
44#include <linux/fs.h>
45#include "comedidev.h"
46#include <linux/cdev.h>
883db3d9 47#include <linux/stat.h>
ed9eccbe 48
476b8477
GKH		 49#include <linux/io.h>
50#include <linux/uaccess.h>
ed9eccbe 51
242e7ad9 52#include "internal.h"
ed9eccbe
DS		 53
54MODULE_AUTHOR("http://www.comedi.org");
55MODULE_DESCRIPTION("Comedi core module");
56MODULE_LICENSE("GPL");
57
58#ifdef CONFIG_COMEDI_DEBUG
59int comedi_debug;
18736438 60EXPORT_SYMBOL(comedi_debug);
4d7df821
IA		 61module_param(comedi_debug, int, S_IRUGO | S_IWUSR);
62MODULE_PARM_DESC(comedi_debug,
63 "enable comedi core and driver debugging if non-zero (default 0)"
64 );
ed9eccbe
DS		 65#endif
66
90ab5ee9 67bool comedi_autoconfig = 1;
4d7df821
IA		 68module_param(comedi_autoconfig, bool, S_IRUGO);
69MODULE_PARM_DESC(comedi_autoconfig,
70 "enable drivers to auto-configure comedi devices (default 1)");
6a9d7a21 71
92d0127c 72static int comedi_num_legacy_minors;
4d7df821
IA		 73module_param(comedi_num_legacy_minors, int, S_IRUGO);
74MODULE_PARM_DESC(comedi_num_legacy_minors,
75 "number of comedi minor devices to reserve for non-auto-configured devices (default 0)"
76 );
77
234bb3c6 78unsigned int comedi_default_buf_size_kb = CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB;
4d7df821
IA		 79module_param(comedi_default_buf_size_kb, uint, S_IRUGO | S_IWUSR);
80MODULE_PARM_DESC(comedi_default_buf_size_kb,
81 "default asynchronous buffer size in KiB (default "
234bb3c6 82 __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB) ")");
4d7df821 83
234bb3c6
IA		 84unsigned int comedi_default_buf_maxsize_kb
85 = CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB;
4d7df821
IA		 86module_param(comedi_default_buf_maxsize_kb, uint, S_IRUGO | S_IWUSR);
87MODULE_PARM_DESC(comedi_default_buf_maxsize_kb,
88 "default maximum size of asynchronous buffer in KiB (default "
234bb3c6 89 __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB) ")");
1dd33ab8 90
ed9eccbe 91static DEFINE_SPINLOCK(comedi_file_info_table_lock);
476b8477 92static struct comedi_device_file_info
0a85b6f0 93*comedi_file_info_table[COMEDI_NUM_MINORS];
476b8477 94
f5283a4b 95static void do_become_nonbusy(struct comedi_device *dev,
0a85b6f0 96 struct comedi_subdevice *s);
34c43922 97static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s);
ed9eccbe
DS		 98
99static int comedi_fasync(int fd, struct file *file, int on);
100
71b5f4f1 101static int is_device_busy(struct comedi_device *dev);
a5011a26 102
883db3d9
FMH		 103static int resize_async_buffer(struct comedi_device *dev,
104 struct comedi_subdevice *s,
a5011a26
HS		 105 struct comedi_async *async, unsigned new_size)
106{
107 int retval;
108
109 if (new_size > async->max_bufsize)
110 return -EPERM;
111
112 if (s->busy) {
113 DPRINTK("subdevice is busy, cannot resize buffer\n");
114 return -EBUSY;
115 }
116 if (async->mmap_count) {
117 DPRINTK("subdevice is mmapped, cannot resize buffer\n");
118 return -EBUSY;
119 }
120
121 if (!async->prealloc_buf)
122 return -EINVAL;
123
124 /* make sure buffer is an integral number of pages
125 * (we round up) */
126 new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK;
127
128 retval = comedi_buf_alloc(dev, s, new_size);
129 if (retval < 0)
130 return retval;
131
132 if (s->buf_change) {
133 retval = s->buf_change(dev, s, new_size);
134 if (retval < 0)
135 return retval;
136 }
137
138 DPRINTK("comedi%i subd %d buffer resized to %i bytes\n",
139 dev->minor, (int)(s - dev->subdevices), async->prealloc_bufsz);
140 return 0;
141}
142
143/* sysfs attribute files */
144
a5011a26
HS		 145static ssize_t show_max_read_buffer_kb(struct device *dev,
146 struct device_attribute *attr, char *buf)
147{
a5011a26 148 struct comedi_device_file_info *info = dev_get_drvdata(dev);
72fd9fac
HS		 149 struct comedi_subdevice *s = comedi_get_read_subdevice(info);
150 unsigned int size = 0;
a5011a26
HS		 151
152 mutex_lock(&info->device->mutex);
72fd9fac
HS		 153 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
154 size = s->async->max_bufsize / 1024;
a5011a26
HS		 155 mutex_unlock(&info->device->mutex);
156
72fd9fac 157 return snprintf(buf, PAGE_SIZE, "%i\n", size);
a5011a26
HS		 158}
159
160static ssize_t store_max_read_buffer_kb(struct device *dev,
161 struct device_attribute *attr,
162 const char *buf, size_t count)
163{
164 struct comedi_device_file_info *info = dev_get_drvdata(dev);
72fd9fac
HS		 165 struct comedi_subdevice *s = comedi_get_read_subdevice(info);
166 unsigned int size;
167 int err;
168
169 err = kstrtouint(buf, 10, &size);
170 if (err)
171 return err;
172 if (size > (UINT_MAX / 1024))
a5011a26 173 return -EINVAL;
72fd9fac 174 size *= 1024;
a5011a26
HS		 175
176 mutex_lock(&info->device->mutex);
72fd9fac
HS		 177 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
178 s->async->max_bufsize = size;
179 else
180 err = -EINVAL;
a5011a26
HS		 181 mutex_unlock(&info->device->mutex);
182
72fd9fac 183 return err ? err : count;
a5011a26
HS		 184}
185
a5011a26
HS		 186static ssize_t show_read_buffer_kb(struct device *dev,
187 struct device_attribute *attr, char *buf)
188{
a5011a26 189 struct comedi_device_file_info *info = dev_get_drvdata(dev);
72fd9fac
HS		 190 struct comedi_subdevice *s = comedi_get_read_subdevice(info);
191 unsigned int size = 0;
a5011a26
HS		 192
193 mutex_lock(&info->device->mutex);
72fd9fac
HS		 194 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
195 size = s->async->prealloc_bufsz / 1024;
a5011a26
HS		 196 mutex_unlock(&info->device->mutex);
197
72fd9fac 198 return snprintf(buf, PAGE_SIZE, "%i\n", size);
a5011a26
HS		 199}
200
201static ssize_t store_read_buffer_kb(struct device *dev,
202 struct device_attribute *attr,
203 const char *buf, size_t count)
204{
205 struct comedi_device_file_info *info = dev_get_drvdata(dev);
72fd9fac
HS		 206 struct comedi_subdevice *s = comedi_get_read_subdevice(info);
207 unsigned int size;
208 int err;
209
210 err = kstrtouint(buf, 10, &size);
211 if (err)
212 return err;
213 if (size > (UINT_MAX / 1024))
a5011a26 214 return -EINVAL;
72fd9fac 215 size *= 1024;
a5011a26
HS		 216
217 mutex_lock(&info->device->mutex);
72fd9fac
HS		 218 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
219 err = resize_async_buffer(info->device, s, s->async, size);
220 else
221 err = -EINVAL;
a5011a26
HS		 222 mutex_unlock(&info->device->mutex);
223
72fd9fac 224 return err ? err : count;
a5011a26 225}
883db3d9 226
a5011a26
HS		 227static ssize_t show_max_write_buffer_kb(struct device *dev,
228 struct device_attribute *attr,
229 char *buf)
230{
a5011a26 231 struct comedi_device_file_info *info = dev_get_drvdata(dev);
72fd9fac
HS		 232 struct comedi_subdevice *s = comedi_get_write_subdevice(info);
233 unsigned int size = 0;
a5011a26
HS		 234
235 mutex_lock(&info->device->mutex);
72fd9fac
HS		 236 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
237 size = s->async->max_bufsize / 1024;
a5011a26
HS		 238 mutex_unlock(&info->device->mutex);
239
72fd9fac 240 return snprintf(buf, PAGE_SIZE, "%i\n", size);
a5011a26
HS		 241}
242
243static ssize_t store_max_write_buffer_kb(struct device *dev,
244 struct device_attribute *attr,
245 const char *buf, size_t count)
246{
247 struct comedi_device_file_info *info = dev_get_drvdata(dev);
72fd9fac
HS		 248 struct comedi_subdevice *s = comedi_get_write_subdevice(info);
249 unsigned int size;
250 int err;
251
252 err = kstrtouint(buf, 10, &size);
253 if (err)
254 return err;
255 if (size > (UINT_MAX / 1024))
a5011a26 256 return -EINVAL;
72fd9fac 257 size *= 1024;
a5011a26
HS		 258
259 mutex_lock(&info->device->mutex);
72fd9fac
HS		 260 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
261 s->async->max_bufsize = size;
262 else
263 err = -EINVAL;
a5011a26
HS		 264 mutex_unlock(&info->device->mutex);
265
72fd9fac 266 return err ? err : count;
a5011a26
HS		 267}
268
a5011a26
HS		 269static ssize_t show_write_buffer_kb(struct device *dev,
270 struct device_attribute *attr, char *buf)
271{
a5011a26 272 struct comedi_device_file_info *info = dev_get_drvdata(dev);
72fd9fac
HS		 273 struct comedi_subdevice *s = comedi_get_write_subdevice(info);
274 unsigned int size = 0;
a5011a26
HS		 275
276 mutex_lock(&info->device->mutex);
72fd9fac
HS		 277 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
278 size = s->async->prealloc_bufsz / 1024;
a5011a26
HS		 279 mutex_unlock(&info->device->mutex);
280
72fd9fac 281 return snprintf(buf, PAGE_SIZE, "%i\n", size);
a5011a26
HS		 282}
283
284static ssize_t store_write_buffer_kb(struct device *dev,
285 struct device_attribute *attr,
286 const char *buf, size_t count)
287{
288 struct comedi_device_file_info *info = dev_get_drvdata(dev);
72fd9fac
HS		 289 struct comedi_subdevice *s = comedi_get_write_subdevice(info);
290 unsigned int size;
291 int err;
292
293 err = kstrtouint(buf, 10, &size);
294 if (err)
295 return err;
296 if (size > (UINT_MAX / 1024))
a5011a26 297 return -EINVAL;
72fd9fac 298 size *= 1024;
a5011a26
HS		 299
300 mutex_lock(&info->device->mutex);
72fd9fac
HS		 301 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
302 err = resize_async_buffer(info->device, s, s->async, size);
303 else
304 err = -EINVAL;
a5011a26
HS		 305 mutex_unlock(&info->device->mutex);
306
72fd9fac 307 return err ? err : count;
a5011a26
HS		 308}
309
fb60367d
HS		 310static struct device_attribute comedi_dev_attrs[] = {
311 __ATTR(max_read_buffer_kb, S_IRUGO | S_IWUSR,
312 show_max_read_buffer_kb, store_max_read_buffer_kb),
313 __ATTR(read_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP,
314 show_read_buffer_kb, store_read_buffer_kb),
315 __ATTR(max_write_buffer_kb, S_IRUGO | S_IWUSR,
316 show_max_write_buffer_kb, store_max_write_buffer_kb),
317 __ATTR(write_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP,
318 show_write_buffer_kb, store_write_buffer_kb),
319 __ATTR_NULL
a5011a26 320};
ed9eccbe 321
ed9eccbe
DS		 322/*
323 COMEDI_DEVCONFIG
324 device config ioctl
325
326 arg:
327 pointer to devconfig structure
328
329 reads:
330 devconfig structure at arg
331
332 writes:
333 none
334*/
0a85b6f0 335static int do_devconfig_ioctl(struct comedi_device *dev,
92d0127c 336 struct comedi_devconfig __user *arg)
ed9eccbe 337{
0707bb04 338 struct comedi_devconfig it;
ed9eccbe
DS		 339 int ret;
340 unsigned char *aux_data = NULL;
341 int aux_len;
342
343 if (!capable(CAP_SYS_ADMIN))
344 return -EPERM;
345
346 if (arg == NULL) {
347 if (is_device_busy(dev))
348 return -EBUSY;
476b8477 349 if (dev->attached) {
ed9eccbe
DS		 350 struct module *driver_module = dev->driver->module;
351 comedi_device_detach(dev);
352 module_put(driver_module);
353 }
354 return 0;
355 }
356
0707bb04 357 if (copy_from_user(&it, arg, sizeof(struct comedi_devconfig)))
ed9eccbe
DS		 358 return -EFAULT;
359
360 it.board_name[COMEDI_NAMELEN - 1] = 0;
361
362 if (comedi_aux_data(it.options, 0) &&
476b8477 363 it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) {
ed9eccbe
DS		 364 int bit_shift;
365 aux_len = it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH];
366 if (aux_len < 0)
367 return -EFAULT;
368
369 aux_data = vmalloc(aux_len);
370 if (!aux_data)
371 return -ENOMEM;
372
373 if (copy_from_user(aux_data,
476b8477 374 comedi_aux_data(it.options, 0), aux_len)) {
ed9eccbe
DS		 375 vfree(aux_data);
376 return -EFAULT;
377 }
378 it.options[COMEDI_DEVCONF_AUX_DATA_LO] =
476b8477 379 (unsigned long)aux_data;
ed9eccbe
DS		 380 if (sizeof(void *) > sizeof(int)) {
381 bit_shift = sizeof(int) * 8;
382 it.options[COMEDI_DEVCONF_AUX_DATA_HI] =
476b8477 383 ((unsigned long)aux_data) >> bit_shift;
ed9eccbe
DS		 384 } else
385 it.options[COMEDI_DEVCONF_AUX_DATA_HI] = 0;
386 }
387
388 ret = comedi_device_attach(dev, &it);
476b8477
GKH		 389 if (ret == 0) {
390 if (!try_module_get(dev->driver->module)) {
ed9eccbe 391 comedi_device_detach(dev);
abae41e6 392 ret = -ENOSYS;
ed9eccbe
DS		 393 }
394 }
395
396 if (aux_data)
397 vfree(aux_data);
398
399 return ret;
400}
401
402/*
403 COMEDI_BUFCONFIG
404 buffer configuration ioctl
405
406 arg:
407 pointer to bufconfig structure
408
409 reads:
410 bufconfig at arg
411
412 writes:
413 modified bufconfig at arg
414
415*/
92d0127c
GKH		 416static int do_bufconfig_ioctl(struct comedi_device *dev,
417 struct comedi_bufconfig __user *arg)
ed9eccbe 418{
be6aba4a 419 struct comedi_bufconfig bc;
d163679c 420 struct comedi_async *async;
34c43922 421 struct comedi_subdevice *s;
883db3d9 422 int retval = 0;
ed9eccbe 423
be6aba4a 424 if (copy_from_user(&bc, arg, sizeof(struct comedi_bufconfig)))
ed9eccbe
DS		 425 return -EFAULT;
426
427 if (bc.subdevice >= dev->n_subdevices || bc.subdevice < 0)
428 return -EINVAL;
429
430 s = dev->subdevices + bc.subdevice;
431 async = s->async;
432
433 if (!async) {
434 DPRINTK("subdevice does not have async capability\n");
435 bc.size = 0;
436 bc.maximum_size = 0;
437 goto copyback;
438 }
439
440 if (bc.maximum_size) {
441 if (!capable(CAP_SYS_ADMIN))
442 return -EPERM;
443
444 async->max_bufsize = bc.maximum_size;
445 }
446
447 if (bc.size) {
883db3d9
FMH		 448 retval = resize_async_buffer(dev, s, async, bc.size);
449 if (retval < 0)
450 return retval;
ed9eccbe
DS		 451 }
452
453 bc.size = async->prealloc_bufsz;
454 bc.maximum_size = async->max_bufsize;
455
476b8477 456copyback:
be6aba4a 457 if (copy_to_user(arg, &bc, sizeof(struct comedi_bufconfig)))
ed9eccbe
DS		 458 return -EFAULT;
459
460 return 0;
461}
462
463/*
464 COMEDI_DEVINFO
465 device info ioctl
466
467 arg:
468 pointer to devinfo structure
469
470 reads:
471 none
472
473 writes:
474 devinfo structure
475
476*/
0a85b6f0 477static int do_devinfo_ioctl(struct comedi_device *dev,
92d0127c
GKH		 478 struct comedi_devinfo __user *arg,
479 struct file *file)
ed9eccbe 480{
063db04b 481 struct comedi_devinfo devinfo;
ed9eccbe 482 const unsigned minor = iminor(file->f_dentry->d_inode);
476b8477
GKH		 483 struct comedi_device_file_info *dev_file_info =
484 comedi_get_device_file_info(minor);
34c43922 485 struct comedi_subdevice *read_subdev =
476b8477 486 comedi_get_read_subdevice(dev_file_info);
34c43922 487 struct comedi_subdevice *write_subdev =
476b8477 488 comedi_get_write_subdevice(dev_file_info);
ed9eccbe
DS		 489
490 memset(&devinfo, 0, sizeof(devinfo));
491
492 /* fill devinfo structure */
493 devinfo.version_code = COMEDI_VERSION_CODE;
494 devinfo.n_subdevs = dev->n_subdevices;
819cbb12
VK		 495 strlcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN);
496 strlcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN);
ed9eccbe 497
476b8477 498 if (read_subdev)
ed9eccbe 499 devinfo.read_subdevice = read_subdev - dev->subdevices;
476b8477 500 else
ed9eccbe 501 devinfo.read_subdevice = -1;
476b8477
GKH		 502
503 if (write_subdev)
ed9eccbe 504 devinfo.write_subdevice = write_subdev - dev->subdevices;
476b8477 505 else
ed9eccbe 506 devinfo.write_subdevice = -1;
ed9eccbe 507
063db04b 508 if (copy_to_user(arg, &devinfo, sizeof(struct comedi_devinfo)))
ed9eccbe
DS		 509 return -EFAULT;
510
511 return 0;
512}
513
514/*
515 COMEDI_SUBDINFO
516 subdevice info ioctl
517
518 arg:
519 pointer to array of subdevice info structures
520
521 reads:
522 none
523
524 writes:
525 array of subdevice info structures at arg
526
527*/
0a85b6f0 528static int do_subdinfo_ioctl(struct comedi_device *dev,
92d0127c 529 struct comedi_subdinfo __user *arg, void *file)
ed9eccbe
DS		 530{
531 int ret, i;
bd52efbb 532 struct comedi_subdinfo *tmp, *us;
34c43922 533 struct comedi_subdevice *s;
ed9eccbe 534
0a85b6f0
MT		 535 tmp =
536 kcalloc(dev->n_subdevices, sizeof(struct comedi_subdinfo),
537 GFP_KERNEL);
ed9eccbe
DS		 538 if (!tmp)
539 return -ENOMEM;
540
541 /* fill subdinfo structs */
542 for (i = 0; i < dev->n_subdevices; i++) {
543 s = dev->subdevices + i;
544 us = tmp + i;
545
546 us->type = s->type;
547 us->n_chan = s->n_chan;
548 us->subd_flags = s->subdev_flags;
549 if (comedi_get_subdevice_runflags(s) & SRF_RUNNING)
550 us->subd_flags |= SDF_RUNNING;
551#define TIMER_nanosec 5 /* backwards compatibility */
552 us->timer_type = TIMER_nanosec;
553 us->len_chanlist = s->len_chanlist;
554 us->maxdata = s->maxdata;
555 if (s->range_table) {
556 us->range_type =
476b8477 557 (i << 24) | (0 << 16) | (s->range_table->length);
ed9eccbe
DS		 558 } else {
559 us->range_type = 0; /* XXX */
560 }
561 us->flags = s->flags;
562
563 if (s->busy)
564 us->subd_flags |= SDF_BUSY;
565 if (s->busy == file)
566 us->subd_flags |= SDF_BUSY_OWNER;
567 if (s->lock)
568 us->subd_flags |= SDF_LOCKED;
569 if (s->lock == file)
570 us->subd_flags |= SDF_LOCK_OWNER;
571 if (!s->maxdata && s->maxdata_list)
572 us->subd_flags |= SDF_MAXDATA;
573 if (s->flaglist)
574 us->subd_flags |= SDF_FLAGS;
575 if (s->range_table_list)
576 us->subd_flags |= SDF_RANGETYPE;
577 if (s->do_cmd)
578 us->subd_flags |= SDF_CMD;
579
580 if (s->insn_bits != &insn_inval)
581 us->insn_bits_support = COMEDI_SUPPORTED;
582 else
583 us->insn_bits_support = COMEDI_UNSUPPORTED;
584
585 us->settling_time_0 = s->settling_time_0;
586 }
587
588 ret = copy_to_user(arg, tmp,
bd52efbb 589 dev->n_subdevices * sizeof(struct comedi_subdinfo));
ed9eccbe
DS		 590
591 kfree(tmp);
592
593 return ret ? -EFAULT : 0;
594}
595
596/*
597 COMEDI_CHANINFO
598 subdevice info ioctl
599
600 arg:
601 pointer to chaninfo structure
602
603 reads:
604 chaninfo structure at arg
605
606 writes:
607 arrays at elements of chaninfo structure
608
609*/
0a85b6f0 610static int do_chaninfo_ioctl(struct comedi_device *dev,
92d0127c 611 struct comedi_chaninfo __user *arg)
ed9eccbe 612{
34c43922 613 struct comedi_subdevice *s;
a18b416d 614 struct comedi_chaninfo it;
ed9eccbe 615
a18b416d 616 if (copy_from_user(&it, arg, sizeof(struct comedi_chaninfo)))
ed9eccbe
DS		 617 return -EFAULT;
618
619 if (it.subdev >= dev->n_subdevices)
620 return -EINVAL;
621 s = dev->subdevices + it.subdev;
622
623 if (it.maxdata_list) {
624 if (s->maxdata || !s->maxdata_list)
625 return -EINVAL;
626 if (copy_to_user(it.maxdata_list, s->maxdata_list,
790c5541 627 s->n_chan * sizeof(unsigned int)))
ed9eccbe
DS		 628 return -EFAULT;
629 }
630
631 if (it.flaglist) {
632 if (!s->flaglist)
633 return -EINVAL;
634 if (copy_to_user(it.flaglist, s->flaglist,
476b8477 635 s->n_chan * sizeof(unsigned int)))
ed9eccbe
DS		 636 return -EFAULT;
637 }
638
639 if (it.rangelist) {
640 int i;
641
642 if (!s->range_table_list)
643 return -EINVAL;
644 for (i = 0; i < s->n_chan; i++) {
645 int x;
646
647 x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) |
476b8477 648 (s->range_table_list[i]->length);
81604d43
VK		 649 if (put_user(x, it.rangelist + i))
650 return -EFAULT;
ed9eccbe 651 }
476b8477
GKH		 652#if 0
653 if (copy_to_user(it.rangelist, s->range_type_list,
0a85b6f0 654 s->n_chan * sizeof(unsigned int)))
476b8477
GKH		 655 return -EFAULT;
656#endif
ed9eccbe
DS		 657 }
658
659 return 0;
660}
661
662 /*
663 COMEDI_BUFINFO
664 buffer information ioctl
665
666 arg:
667 pointer to bufinfo structure
668
669 reads:
670 bufinfo at arg
671
672 writes:
673 modified bufinfo at arg
674
675 */
92d0127c 676static int do_bufinfo_ioctl(struct comedi_device *dev,
53fa827e 677 struct comedi_bufinfo __user *arg, void *file)
ed9eccbe 678{
9aa5339a 679 struct comedi_bufinfo bi;
34c43922 680 struct comedi_subdevice *s;
d163679c 681 struct comedi_async *async;
ed9eccbe 682
9aa5339a 683 if (copy_from_user(&bi, arg, sizeof(struct comedi_bufinfo)))
ed9eccbe
DS		 684 return -EFAULT;
685
686 if (bi.subdevice >= dev->n_subdevices || bi.subdevice < 0)
687 return -EINVAL;
688
689 s = dev->subdevices + bi.subdevice;
53fa827e
IA		 690
691 if (s->lock && s->lock != file)
692 return -EACCES;
693
ed9eccbe
DS		 694 async = s->async;
695
696 if (!async) {
697 DPRINTK("subdevice does not have async capability\n");
698 bi.buf_write_ptr = 0;
699 bi.buf_read_ptr = 0;
700 bi.buf_write_count = 0;
701 bi.buf_read_count = 0;
4772c018
IA		 702 bi.bytes_read = 0;
703 bi.bytes_written = 0;
ed9eccbe
DS		 704 goto copyback;
705 }
53fa827e
IA		 706 if (!s->busy) {
707 bi.bytes_read = 0;
708 bi.bytes_written = 0;
709 goto copyback_position;
710 }
711 if (s->busy != file)
712 return -EACCES;
ed9eccbe
DS		 713
714 if (bi.bytes_read && (s->subdev_flags & SDF_CMD_READ)) {
715 bi.bytes_read = comedi_buf_read_alloc(async, bi.bytes_read);
716 comedi_buf_read_free(async, bi.bytes_read);
717
718 if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR |
476b8477
GKH		 719 SRF_RUNNING))
720 && async->buf_write_count == async->buf_read_count) {
ed9eccbe
DS		 721 do_become_nonbusy(dev, s);
722 }
723 }
724
725 if (bi.bytes_written && (s->subdev_flags & SDF_CMD_WRITE)) {
726 bi.bytes_written =
476b8477 727 comedi_buf_write_alloc(async, bi.bytes_written);
ed9eccbe
DS		 728 comedi_buf_write_free(async, bi.bytes_written);
729 }
730
53fa827e 731copyback_position:
ed9eccbe
DS		 732 bi.buf_write_count = async->buf_write_count;
733 bi.buf_write_ptr = async->buf_write_ptr;
734 bi.buf_read_count = async->buf_read_count;
735 bi.buf_read_ptr = async->buf_read_ptr;
736
476b8477 737copyback:
9aa5339a 738 if (copy_to_user(arg, &bi, sizeof(struct comedi_bufinfo)))
ed9eccbe
DS		 739 return -EFAULT;
740
741 return 0;
742}
743
0a85b6f0
MT		 744static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn,
745 unsigned int *data, void *file);
ed9eccbe 746/*
20617f22
PDP		 747 * COMEDI_INSNLIST
748 * synchronous instructions
ed9eccbe 749 *
20617f22
PDP		 750 * arg:
751 * pointer to sync cmd structure
ed9eccbe 752 *
20617f22
PDP		 753 * reads:
754 * sync cmd struct at arg
755 * instruction list
756 * data (for writes)
ed9eccbe 757 *
20617f22
PDP		 758 * writes:
759 * data (for reads)
ed9eccbe
DS		 760 */
761/* arbitrary limits */
762#define MAX_SAMPLES 256
92d0127c
GKH		 763static int do_insnlist_ioctl(struct comedi_device *dev,
764 struct comedi_insnlist __user *arg, void *file)
ed9eccbe 765{
da613f4f 766 struct comedi_insnlist insnlist;
90035c08 767 struct comedi_insn *insns = NULL;
790c5541 768 unsigned int *data = NULL;
ed9eccbe
DS		 769 int i = 0;
770 int ret = 0;
771
da613f4f 772 if (copy_from_user(&insnlist, arg, sizeof(struct comedi_insnlist)))
ed9eccbe
DS		 773 return -EFAULT;
774
790c5541 775 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL);
ed9eccbe
DS		 776 if (!data) {
777 DPRINTK("kmalloc failed\n");
778 ret = -ENOMEM;
779 goto error;
780 }
781
0a85b6f0 782 insns =
dfd8ee92 783 kcalloc(insnlist.n_insns, sizeof(struct comedi_insn), GFP_KERNEL);
ed9eccbe
DS		 784 if (!insns) {
785 DPRINTK("kmalloc failed\n");
786 ret = -ENOMEM;
787 goto error;
788 }
789
790 if (copy_from_user(insns, insnlist.insns,
90035c08 791 sizeof(struct comedi_insn) * insnlist.n_insns)) {
ed9eccbe
DS		 792 DPRINTK("copy_from_user failed\n");
793 ret = -EFAULT;
794 goto error;
795 }
796
797 for (i = 0; i < insnlist.n_insns; i++) {
798 if (insns[i].n > MAX_SAMPLES) {
799 DPRINTK("number of samples too large\n");
800 ret = -EINVAL;
801 goto error;
802 }
803 if (insns[i].insn & INSN_MASK_WRITE) {
804 if (copy_from_user(data, insns[i].data,
790c5541 805 insns[i].n * sizeof(unsigned int))) {
ed9eccbe
DS		 806 DPRINTK("copy_from_user failed\n");
807 ret = -EFAULT;
808 goto error;
809 }
810 }
811 ret = parse_insn(dev, insns + i, data, file);
812 if (ret < 0)
813 goto error;
814 if (insns[i].insn & INSN_MASK_READ) {
815 if (copy_to_user(insns[i].data, data,
790c5541 816 insns[i].n * sizeof(unsigned int))) {
ed9eccbe
DS		 817 DPRINTK("copy_to_user failed\n");
818 ret = -EFAULT;
819 goto error;
820 }
821 }
822 if (need_resched())
823 schedule();
824 }
825
476b8477
GKH		 826error:
827 kfree(insns);
828 kfree(data);
ed9eccbe
DS		 829
830 if (ret < 0)
831 return ret;
832 return i;
833}
834
0a85b6f0
MT		 835static int check_insn_config_length(struct comedi_insn *insn,
836 unsigned int *data)
ed9eccbe 837{
476b8477
GKH		 838 if (insn->n < 1)
839 return -EINVAL;
ed9eccbe
DS		 840
841 switch (data[0]) {
842 case INSN_CONFIG_DIO_OUTPUT:
843 case INSN_CONFIG_DIO_INPUT:
844 case INSN_CONFIG_DISARM:
845 case INSN_CONFIG_RESET:
846 if (insn->n == 1)
847 return 0;
848 break;
849 case INSN_CONFIG_ARM:
850 case INSN_CONFIG_DIO_QUERY:
851 case INSN_CONFIG_BLOCK_SIZE:
852 case INSN_CONFIG_FILTER:
853 case INSN_CONFIG_SERIAL_CLOCK:
854 case INSN_CONFIG_BIDIRECTIONAL_DATA:
855 case INSN_CONFIG_ALT_SOURCE:
856 case INSN_CONFIG_SET_COUNTER_MODE:
857 case INSN_CONFIG_8254_READ_STATUS:
858 case INSN_CONFIG_SET_ROUTING:
859 case INSN_CONFIG_GET_ROUTING:
860 case INSN_CONFIG_GET_PWM_STATUS:
861 case INSN_CONFIG_PWM_SET_PERIOD:
862 case INSN_CONFIG_PWM_GET_PERIOD:
863 if (insn->n == 2)
864 return 0;
865 break;
866 case INSN_CONFIG_SET_GATE_SRC:
867 case INSN_CONFIG_GET_GATE_SRC:
868 case INSN_CONFIG_SET_CLOCK_SRC:
869 case INSN_CONFIG_GET_CLOCK_SRC:
870 case INSN_CONFIG_SET_OTHER_SRC:
871 case INSN_CONFIG_GET_COUNTER_STATUS:
872 case INSN_CONFIG_PWM_SET_H_BRIDGE:
873 case INSN_CONFIG_PWM_GET_H_BRIDGE:
874 case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE:
875 if (insn->n == 3)
876 return 0;
877 break;
878 case INSN_CONFIG_PWM_OUTPUT:
879 case INSN_CONFIG_ANALOG_TRIG:
880 if (insn->n == 5)
881 return 0;
882 break;
0a85b6f0
MT		 883 /* by default we allow the insn since we don't have checks for
884 * all possible cases yet */
ed9eccbe 885 default:
3fffdf20
MR		 886 printk(KERN_WARNING
887 "comedi: no check for data length of config insn id "
0a85b6f0
MT		 888 "%i is implemented.\n"
889 " Add a check to %s in %s.\n"
890 " Assuming n=%i is correct.\n", data[0], __func__,
891 __FILE__, insn->n);
ed9eccbe
DS		 892 return 0;
893 break;
894 }
895 return -EINVAL;
896}
897
0a85b6f0
MT		 898static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn,
899 unsigned int *data, void *file)
ed9eccbe 900{
34c43922 901 struct comedi_subdevice *s;
ed9eccbe
DS		 902 int ret = 0;
903 int i;
904
905 if (insn->insn & INSN_MASK_SPECIAL) {
906 /* a non-subdevice instruction */
907
908 switch (insn->insn) {
909 case INSN_GTOD:
910 {
911 struct timeval tv;
912
913 if (insn->n != 2) {
914 ret = -EINVAL;
915 break;
916 }
917
918 do_gettimeofday(&tv);
919 data[0] = tv.tv_sec;
920 data[1] = tv.tv_usec;
921 ret = 2;
922
923 break;
924 }
925 case INSN_WAIT:
926 if (insn->n != 1 || data[0] >= 100000) {
927 ret = -EINVAL;
928 break;
929 }
930 udelay(data[0] / 1000);
931 ret = 1;
932 break;
933 case INSN_INTTRIG:
934 if (insn->n != 1) {
935 ret = -EINVAL;
936 break;
937 }
938 if (insn->subdev >= dev->n_subdevices) {
939 DPRINTK("%d not usable subdevice\n",
940 insn->subdev);
941 ret = -EINVAL;
942 break;
943 }
944 s = dev->subdevices + insn->subdev;
945 if (!s->async) {
946 DPRINTK("no async\n");
947 ret = -EINVAL;
948 break;
949 }
950 if (!s->async->inttrig) {
951 DPRINTK("no inttrig\n");
952 ret = -EAGAIN;
953 break;
954 }
955 ret = s->async->inttrig(dev, s, insn->data[0]);
956 if (ret >= 0)
957 ret = 1;
958 break;
959 default:
960 DPRINTK("invalid insn\n");
961 ret = -EINVAL;
962 break;
963 }
964 } else {
965 /* a subdevice instruction */
790c5541 966 unsigned int maxdata;
ed9eccbe
DS		 967
968 if (insn->subdev >= dev->n_subdevices) {
969 DPRINTK("subdevice %d out of range\n", insn->subdev);
970 ret = -EINVAL;
971 goto out;
972 }
973 s = dev->subdevices + insn->subdev;
974
975 if (s->type == COMEDI_SUBD_UNUSED) {
976 DPRINTK("%d not usable subdevice\n", insn->subdev);
977 ret = -EIO;
978 goto out;
979 }
980
981 /* are we locked? (ioctl lock) */
982 if (s->lock && s->lock != file) {
983 DPRINTK("device locked\n");
984 ret = -EACCES;
985 goto out;
986 }
987
0fd0ca75 988 ret = comedi_check_chanlist(s, 1, &insn->chanspec);
476b8477 989 if (ret < 0) {
ed9eccbe
DS		 990 ret = -EINVAL;
991 DPRINTK("bad chanspec\n");
992 goto out;
993 }
994
995 if (s->busy) {
996 ret = -EBUSY;
997 goto out;
998 }
999 /* This looks arbitrary. It is. */
1000 s->busy = &parse_insn;
1001 switch (insn->insn) {
1002 case INSN_READ:
1003 ret = s->insn_read(dev, s, insn, data);
1004 break;
1005 case INSN_WRITE:
1006 maxdata = s->maxdata_list
476b8477
GKH		 1007 ? s->maxdata_list[CR_CHAN(insn->chanspec)]
1008 : s->maxdata;
ed9eccbe
DS		 1009 for (i = 0; i < insn->n; ++i) {
1010 if (data[i] > maxdata) {
1011 ret = -EINVAL;
1012 DPRINTK("bad data value(s)\n");
1013 break;
1014 }
1015 }
1016 if (ret == 0)
1017 ret = s->insn_write(dev, s, insn, data);
1018 break;
1019 case INSN_BITS:
1020 if (insn->n != 2) {
1021 ret = -EINVAL;
2f644ccf
IA		 1022 } else {
1023 /* Most drivers ignore the base channel in
1024 * insn->chanspec. Fix this here if
1025 * the subdevice has <= 32 channels. */
1026 unsigned int shift;
1027 unsigned int orig_mask;
1028
1029 orig_mask = data[0];
1030 if (s->n_chan <= 32) {
1031 shift = CR_CHAN(insn->chanspec);
1032 if (shift > 0) {
1033 insn->chanspec = 0;
1034 data[0] <<= shift;
1035 data[1] <<= shift;
1036 }
1037 } else
1038 shift = 0;
1039 ret = s->insn_bits(dev, s, insn, data);
1040 data[0] = orig_mask;
1041 if (shift > 0)
1042 data[1] >>= shift;
ed9eccbe 1043 }
ed9eccbe
DS		 1044 break;
1045 case INSN_CONFIG:
1046 ret = check_insn_config_length(insn, data);
1047 if (ret)
1048 break;
1049 ret = s->insn_config(dev, s, insn, data);
1050 break;
1051 default:
1052 ret = -EINVAL;
1053 break;
1054 }
1055
1056 s->busy = NULL;
1057 }
1058
476b8477 1059out:
ed9eccbe
DS		 1060 return ret;
1061}
1062
1063/*
20617f22
PDP		 1064 * COMEDI_INSN
1065 * synchronous instructions
ed9eccbe 1066 *
20617f22
PDP		 1067 * arg:
1068 * pointer to insn
ed9eccbe 1069 *
20617f22
PDP		 1070 * reads:
1071 * struct comedi_insn struct at arg
1072 * data (for writes)
ed9eccbe 1073 *
20617f22
PDP		 1074 * writes:
1075 * data (for reads)
ed9eccbe 1076 */
92d0127c
GKH		 1077static int do_insn_ioctl(struct comedi_device *dev,
1078 struct comedi_insn __user *arg, void *file)
ed9eccbe 1079{
90035c08 1080 struct comedi_insn insn;
790c5541 1081 unsigned int *data = NULL;
ed9eccbe
DS		 1082 int ret = 0;
1083
790c5541 1084 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL);
ed9eccbe
DS		 1085 if (!data) {
1086 ret = -ENOMEM;
1087 goto error;
1088 }
1089
90035c08 1090 if (copy_from_user(&insn, arg, sizeof(struct comedi_insn))) {
ed9eccbe
DS		 1091 ret = -EFAULT;
1092 goto error;
1093 }
1094
1095 /* This is where the behavior of insn and insnlist deviate. */
1096 if (insn.n > MAX_SAMPLES)
1097 insn.n = MAX_SAMPLES;
1098 if (insn.insn & INSN_MASK_WRITE) {
21fe2eea
M		 1099 if (copy_from_user(data,
1100 insn.data,
1101 insn.n * sizeof(unsigned int))) {
ed9eccbe
DS		 1102 ret = -EFAULT;
1103 goto error;
1104 }
1105 }
1106 ret = parse_insn(dev, &insn, data, file);
1107 if (ret < 0)
1108 goto error;
1109 if (insn.insn & INSN_MASK_READ) {
21fe2eea
M		 1110 if (copy_to_user(insn.data,
1111 data,
1112 insn.n * sizeof(unsigned int))) {
ed9eccbe
DS		 1113 ret = -EFAULT;
1114 goto error;
1115 }
1116 }
1117 ret = insn.n;
1118
476b8477
GKH		 1119error:
1120 kfree(data);
ed9eccbe
DS		 1121
1122 return ret;
1123}
1124
181bd67b
GKH		 1125static void comedi_set_subdevice_runflags(struct comedi_subdevice *s,
1126 unsigned mask, unsigned bits)
1127{
1128 unsigned long flags;
1129
1130 spin_lock_irqsave(&s->spin_lock, flags);
1131 s->runflags &= ~mask;
1132 s->runflags |= (bits & mask);
1133 spin_unlock_irqrestore(&s->spin_lock, flags);
1134}
1135
92d0127c
GKH		 1136static int do_cmd_ioctl(struct comedi_device *dev,
1137 struct comedi_cmd __user *cmd, void *file)
ed9eccbe 1138{
ea6d0d4c 1139 struct comedi_cmd user_cmd;
34c43922 1140 struct comedi_subdevice *s;
d163679c 1141 struct comedi_async *async;
ed9eccbe 1142 int ret = 0;
92d0127c 1143 unsigned int __user *chanlist_saver = NULL;
ed9eccbe 1144
92d0127c 1145 if (copy_from_user(&user_cmd, cmd, sizeof(struct comedi_cmd))) {
ed9eccbe
DS		 1146 DPRINTK("bad cmd address\n");
1147 return -EFAULT;
1148 }
476b8477 1149 /* save user's chanlist pointer so it can be restored later */
ed9eccbe
DS		 1150 chanlist_saver = user_cmd.chanlist;
1151
1152 if (user_cmd.subdev >= dev->n_subdevices) {
1153 DPRINTK("%d no such subdevice\n", user_cmd.subdev);
1154 return -ENODEV;
1155 }
1156
1157 s = dev->subdevices + user_cmd.subdev;
1158 async = s->async;
1159
1160 if (s->type == COMEDI_SUBD_UNUSED) {
1161 DPRINTK("%d not valid subdevice\n", user_cmd.subdev);
1162 return -EIO;
1163 }
1164
1165 if (!s->do_cmd || !s->do_cmdtest || !s->async) {
1166 DPRINTK("subdevice %i does not support commands\n",
1167 user_cmd.subdev);
1168 return -EIO;
1169 }
1170
1171 /* are we locked? (ioctl lock) */
1172 if (s->lock && s->lock != file) {
1173 DPRINTK("subdevice locked\n");
1174 return -EACCES;
1175 }
1176
1177 /* are we busy? */
1178 if (s->busy) {
1179 DPRINTK("subdevice busy\n");
1180 return -EBUSY;
1181 }
1182 s->busy = file;
1183
1184 /* make sure channel/gain list isn't too long */
1185 if (user_cmd.chanlist_len > s->len_chanlist) {
1186 DPRINTK("channel/gain list too long %u > %d\n",
1187 user_cmd.chanlist_len, s->len_chanlist);
1188 ret = -EINVAL;
1189 goto cleanup;
1190 }
1191
1192 /* make sure channel/gain list isn't too short */
1193 if (user_cmd.chanlist_len < 1) {
1194 DPRINTK("channel/gain list too short %u < 1\n",
1195 user_cmd.chanlist_len);
1196 ret = -EINVAL;
1197 goto cleanup;
1198 }
1199
476b8477 1200 kfree(async->cmd.chanlist);
ed9eccbe
DS		 1201 async->cmd = user_cmd;
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
1212 if (copy_from_user(async->cmd.chanlist, user_cmd.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);
1232 user_cmd = async->cmd;
476b8477 1233 /* restore chanlist pointer before copying back */
ed9eccbe
DS		 1234 user_cmd.chanlist = chanlist_saver;
1235 user_cmd.data = NULL;
92d0127c 1236 if (copy_to_user(cmd, &user_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{
ea6d0d4c 1289 struct comedi_cmd user_cmd;
34c43922 1290 struct comedi_subdevice *s;
ed9eccbe
DS		 1291 int ret = 0;
1292 unsigned int *chanlist = NULL;
92d0127c 1293 unsigned int __user *chanlist_saver = NULL;
ed9eccbe 1294
ea6d0d4c 1295 if (copy_from_user(&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 */
ed9eccbe
DS		 1300 chanlist_saver = user_cmd.chanlist;
1301
1302 if (user_cmd.subdev >= dev->n_subdevices) {
1303 DPRINTK("%d no such subdevice\n", user_cmd.subdev);
1304 return -ENODEV;
1305 }
1306
1307 s = dev->subdevices + user_cmd.subdev;
1308 if (s->type == COMEDI_SUBD_UNUSED) {
1309 DPRINTK("%d not valid subdevice\n", user_cmd.subdev);
1310 return -EIO;
1311 }
1312
1313 if (!s->do_cmd || !s->do_cmdtest) {
1314 DPRINTK("subdevice %i does not support commands\n",
1315 user_cmd.subdev);
1316 return -EIO;
1317 }
1318
1319 /* make sure channel/gain list isn't too long */
1320 if (user_cmd.chanlist_len > s->len_chanlist) {
1321 DPRINTK("channel/gain list too long %d > %d\n",
1322 user_cmd.chanlist_len, s->len_chanlist);
1323 ret = -EINVAL;
1324 goto cleanup;
1325 }
1326
1327 /* load channel/gain list */
1328 if (user_cmd.chanlist) {
1329 chanlist =
476b8477 1330 kmalloc(user_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
1337 if (copy_from_user(chanlist, user_cmd.chanlist,
476b8477 1338 user_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 */
0fd0ca75 1345 ret = comedi_check_chanlist(s, user_cmd.chanlist_len, chanlist);
476b8477 1346 if (ret < 0) {
ed9eccbe
DS		 1347 DPRINTK("bad chanlist\n");
1348 goto cleanup;
1349 }
1350
1351 user_cmd.chanlist = chanlist;
1352 }
1353
1354 ret = s->do_cmdtest(dev, s, &user_cmd);
1355
476b8477 1356 /* restore chanlist pointer before copying back */
ed9eccbe
DS		 1357 user_cmd.chanlist = chanlist_saver;
1358
ea6d0d4c 1359 if (copy_to_user(arg, &user_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;
1394 s = dev->subdevices + arg;
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;
1437 s = dev->subdevices + arg;
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;
1478 s = dev->subdevices + arg;
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;
1515 s = dev->subdevices + arg;
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 */
34c43922 2029void do_become_nonbusy(struct comedi_device *dev, struct comedi_subdevice *s)
ed9eccbe 2030{
d163679c 2031 struct comedi_async *async = s->async;
ed9eccbe
DS		 2032
2033 comedi_set_subdevice_runflags(s, SRF_RUNNING, 0);
ed9eccbe
DS		 2034 if (async) {
2035 comedi_reset_async_buf(async);
2036 async->inttrig = NULL;
2037 } else {
476b8477
GKH		 2038 printk(KERN_ERR
2039 "BUG: (?) do_become_nonbusy called with async=0\n");
ed9eccbe
DS		 2040 }
2041
2042 s->busy = NULL;
2043}
2044
2045static int comedi_open(struct inode *inode, struct file *file)
2046{
ed9eccbe 2047 const unsigned minor = iminor(inode);
476b8477
GKH		 2048 struct comedi_device_file_info *dev_file_info =
2049 comedi_get_device_file_info(minor);
0a85b6f0
MT		 2050 struct comedi_device *dev =
2051 dev_file_info ? dev_file_info->device : NULL;
97920071 2052
ed9eccbe
DS		 2053 if (dev == NULL) {
2054 DPRINTK("invalid minor number\n");
2055 return -ENODEV;
2056 }
2057
2058 /* This is slightly hacky, but we want module autoloading
2059 * to work for root.
2060 * case: user opens device, attached -> ok
2061 * case: user opens device, unattached, in_request_module=0 -> autoload
2062 * case: user opens device, unattached, in_request_module=1 -> fail
2063 * case: root opens device, attached -> ok
2064 * case: root opens device, unattached, in_request_module=1 -> ok
2065 * (typically called from modprobe)
2066 * case: root opens device, unattached, in_request_module=0 -> autoload
2067 *
2068 * The last could be changed to "-> ok", which would deny root
2069 * autoloading.
2070 */
2071 mutex_lock(&dev->mutex);
2072 if (dev->attached)
2073 goto ok;
a8f80e8f 2074 if (!capable(CAP_NET_ADMIN) && dev->in_request_module) {
ed9eccbe
DS		 2075 DPRINTK("in request module\n");
2076 mutex_unlock(&dev->mutex);
2077 return -ENODEV;
2078 }
a8f80e8f 2079 if (capable(CAP_NET_ADMIN) && dev->in_request_module)
ed9eccbe
DS		 2080 goto ok;
2081
2082 dev->in_request_module = 1;
2083
ed9eccbe
DS		 2084#ifdef CONFIG_KMOD
2085 mutex_unlock(&dev->mutex);
56d92c60 2086 request_module("char-major-%i-%i", COMEDI_MAJOR, dev->minor);
ed9eccbe
DS		 2087 mutex_lock(&dev->mutex);
2088#endif
2089
2090 dev->in_request_module = 0;
2091
a8f80e8f
EP		 2092 if (!dev->attached && !capable(CAP_NET_ADMIN)) {
2093 DPRINTK("not attached and not CAP_NET_ADMIN\n");
ed9eccbe
DS		 2094 mutex_unlock(&dev->mutex);
2095 return -ENODEV;
2096 }
2097ok:
2098 __module_get(THIS_MODULE);
2099
2100 if (dev->attached) {
2101 if (!try_module_get(dev->driver->module)) {
2102 module_put(THIS_MODULE);
2103 mutex_unlock(&dev->mutex);
2104 return -ENOSYS;
2105 }
2106 }
2107
3c17ba07
IA		 2108 if (dev->attached && dev->use_count == 0 && dev->open) {
2109 int rc = dev->open(dev);
2110 if (rc < 0) {
2111 module_put(dev->driver->module);
2112 module_put(THIS_MODULE);
2113 mutex_unlock(&dev->mutex);
2114 return rc;
2115 }
2116 }
ed9eccbe
DS		 2117
2118 dev->use_count++;
2119
a5011a26 2120 mutex_unlock(&dev->mutex);
ed9eccbe 2121
a5011a26 2122 return 0;
ed9eccbe
DS		 2123}
2124
a5011a26 2125static int comedi_close(struct inode *inode, struct file *file)
ed9eccbe 2126{
a5011a26
HS		 2127 const unsigned minor = iminor(inode);
2128 struct comedi_subdevice *s = NULL;
ed9eccbe 2129 int i;
a5011a26
HS		 2130 struct comedi_device_file_info *dev_file_info;
2131 struct comedi_device *dev;
2132 dev_file_info = comedi_get_device_file_info(minor);
ed9eccbe 2133
a5011a26
HS		 2134 if (dev_file_info == NULL)
2135 return -ENODEV;
2136 dev = dev_file_info->device;
2137 if (dev == NULL)
2138 return -ENODEV;
ed9eccbe 2139
a5011a26
HS		 2140 mutex_lock(&dev->mutex);
2141
2142 if (dev->subdevices) {
2143 for (i = 0; i < dev->n_subdevices; i++) {
2144 s = dev->subdevices + i;
2145
2146 if (s->busy == file)
2147 do_cancel(dev, s);
2148 if (s->lock == file)
2149 s->lock = NULL;
2150 }
ed9eccbe 2151 }
a5011a26
HS		 2152 if (dev->attached && dev->use_count == 1 && dev->close)
2153 dev->close(dev);
2154
2155 module_put(THIS_MODULE);
2156 if (dev->attached)
2157 module_put(dev->driver->module);
2158
2159 dev->use_count--;
2160
2161 mutex_unlock(&dev->mutex);
2162
2163 if (file->f_flags & FASYNC)
2164 comedi_fasync(-1, file, 0);
ed9eccbe
DS		 2165
2166 return 0;
2167}
2168
a5011a26 2169static int comedi_fasync(int fd, struct file *file, int on)
ed9eccbe 2170{
a5011a26
HS		 2171 const unsigned minor = iminor(file->f_dentry->d_inode);
2172 struct comedi_device_file_info *dev_file_info;
2173 struct comedi_device *dev;
2174 dev_file_info = comedi_get_device_file_info(minor);
ed9eccbe 2175
a5011a26
HS		 2176 if (dev_file_info == NULL)
2177 return -ENODEV;
2178 dev = dev_file_info->device;
476b8477 2179 if (dev == NULL)
a5011a26
HS		 2180 return -ENODEV;
2181
2182 return fasync_helper(fd, file, on, &dev->async_queue);
ed9eccbe
DS		 2183}
2184
a5011a26
HS		 2185const struct file_operations comedi_fops = {
2186 .owner = THIS_MODULE,
2187 .unlocked_ioctl = comedi_unlocked_ioctl,
2188 .compat_ioctl = comedi_compat_ioctl,
2189 .open = comedi_open,
2190 .release = comedi_close,
2191 .read = comedi_read,
2192 .write = comedi_write,
2193 .mmap = comedi_mmap,
2194 .poll = comedi_poll,
2195 .fasync = comedi_fasync,
2196 .llseek = noop_llseek,
2197};
2198
2199struct class *comedi_class;
2200static struct cdev comedi_cdev;
2201
2202static void comedi_cleanup_legacy_minors(void)
ed9eccbe 2203{
ed9eccbe
DS		 2204 unsigned i;
2205
a5011a26 2206 for (i = 0; i < comedi_num_legacy_minors; i++)
883db3d9 2207 comedi_free_board_minor(i);
ed9eccbe
DS		 2208}
2209
a5011a26 2210static int __init comedi_init(void)
ed9eccbe 2211{
a5011a26
HS		 2212 int i;
2213 int retval;
ed9eccbe 2214
a5011a26
HS		 2215 printk(KERN_INFO "comedi: version " COMEDI_RELEASE
2216 " - http://www.comedi.org\n");
ed9eccbe 2217
a5011a26
HS		 2218 if (comedi_num_legacy_minors < 0 ||
2219 comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) {
2220 printk(KERN_ERR "comedi: error: invalid value for module "
2221 "parameter \"comedi_num_legacy_minors\". Valid values "
2222 "are 0 through %i.\n", COMEDI_NUM_BOARD_MINORS);
2223 return -EINVAL;
ed9eccbe 2224 }
c43435d7 2225
a5011a26
HS		 2226 /*
2227 * comedi is unusable if both comedi_autoconfig and
2228 * comedi_num_legacy_minors are zero, so we might as well adjust the
2229 * defaults in that case
2230 */
2231 if (comedi_autoconfig == 0 && comedi_num_legacy_minors == 0)
2232 comedi_num_legacy_minors = 16;
c43435d7 2233
a5011a26
HS		 2234 memset(comedi_file_info_table, 0,
2235 sizeof(struct comedi_device_file_info *) * COMEDI_NUM_MINORS);
ed9eccbe 2236
a5011a26
HS		 2237 retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2238 COMEDI_NUM_MINORS, "comedi");
2239 if (retval)
2240 return -EIO;
2241 cdev_init(&comedi_cdev, &comedi_fops);
2242 comedi_cdev.owner = THIS_MODULE;
2243 kobject_set_name(&comedi_cdev.kobj, "comedi");
2244 if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) {
2245 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2246 COMEDI_NUM_MINORS);
2247 return -EIO;
883db3d9 2248 }
a5011a26
HS		 2249 comedi_class = class_create(THIS_MODULE, "comedi");
2250 if (IS_ERR(comedi_class)) {
2251 printk(KERN_ERR "comedi: failed to create class");
2252 cdev_del(&comedi_cdev);
2253 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2254 COMEDI_NUM_MINORS);
2255 return PTR_ERR(comedi_class);
883db3d9 2256 }
a5011a26 2257
fb60367d
HS		 2258 comedi_class->dev_attrs = comedi_dev_attrs;
2259
a5011a26
HS		 2260 /* XXX requires /proc interface */
2261 comedi_proc_init();
2262
2263 /* create devices files for legacy/manual use */
2264 for (i = 0; i < comedi_num_legacy_minors; i++) {
2265 int minor;
2266 minor = comedi_alloc_board_minor(NULL);
2267 if (minor < 0) {
2268 comedi_cleanup_legacy_minors();
2269 cdev_del(&comedi_cdev);
2270 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2271 COMEDI_NUM_MINORS);
2272 return minor;
2273 }
883db3d9 2274 }
a5011a26
HS		 2275
2276 return 0;
ed9eccbe
DS		 2277}
2278
a5011a26 2279static void __exit comedi_cleanup(void)
ed9eccbe 2280{
a5011a26 2281 int i;
ed9eccbe 2282
a5011a26
HS		 2283 comedi_cleanup_legacy_minors();
2284 for (i = 0; i < COMEDI_NUM_MINORS; ++i)
2285 BUG_ON(comedi_file_info_table[i]);
ed9eccbe 2286
a5011a26
HS		 2287 class_destroy(comedi_class);
2288 cdev_del(&comedi_cdev);
2289 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS);
ed9eccbe 2290
a5011a26 2291 comedi_proc_cleanup();
ed9eccbe
DS		 2292}
2293
a5011a26
HS		 2294module_init(comedi_init);
2295module_exit(comedi_cleanup);
ed9eccbe 2296
a5011a26
HS		 2297void comedi_error(const struct comedi_device *dev, const char *s)
2298{
2299 printk(KERN_ERR "comedi%d: %s: %s\n", dev->minor,
2300 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
HS		 2367 for (i = 0; i < dev->n_subdevices; i++) {
2368 s = dev->subdevices + i;
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);
2424 printk(KERN_ERR
2425 "comedi: error: "
2426 "ran out of minor numbers for board device files.\n");
2427 return -EBUSY;
2428 }
2429 info->device->minor = i;
2430 csdev = device_create(comedi_class, hardware_device,
2431 MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i", i);
2432 if (!IS_ERR(csdev))
2433 info->device->class_dev = csdev;
2434 dev_set_drvdata(csdev, info);
883db3d9 2435
a5011a26 2436 return i;
883db3d9
FMH		 2437}
2438
a5011a26 2439void comedi_free_board_minor(unsigned minor)
883db3d9 2440{
a5011a26 2441 struct comedi_device_file_info *info;
883db3d9 2442
a5011a26
HS		 2443 BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS);
2444 spin_lock(&comedi_file_info_table_lock);
2445 info = comedi_file_info_table[minor];
2446 comedi_file_info_table[minor] = NULL;
2447 spin_unlock(&comedi_file_info_table_lock);
883db3d9 2448
a5011a26
HS		 2449 if (info) {
2450 struct comedi_device *dev = info->device;
2451 if (dev) {
2452 if (dev->class_dev) {
2453 device_destroy(comedi_class,
2454 MKDEV(COMEDI_MAJOR, dev->minor));
2455 }
2456 comedi_device_cleanup(dev);
2457 kfree(dev);
2458 }
2459 kfree(info);
883db3d9 2460 }
883db3d9
FMH		 2461}
2462
a5011a26 2463int comedi_find_board_minor(struct device *hardware_device)
883db3d9 2464{
a5011a26
HS		 2465 int minor;
2466 struct comedi_device_file_info *info;
883db3d9 2467
a5011a26
HS		 2468 for (minor = 0; minor < COMEDI_NUM_BOARD_MINORS; minor++) {
2469 spin_lock(&comedi_file_info_table_lock);
2470 info = comedi_file_info_table[minor];
2471 if (info && info->hardware_device == hardware_device) {
2472 spin_unlock(&comedi_file_info_table_lock);
2473 return minor;
2474 }
2475 spin_unlock(&comedi_file_info_table_lock);
883db3d9 2476 }
a5011a26 2477 return -ENODEV;
883db3d9
FMH		 2478}
2479
a5011a26
HS		 2480int comedi_alloc_subdevice_minor(struct comedi_device *dev,
2481 struct comedi_subdevice *s)
883db3d9 2482{
a5011a26
HS		 2483 struct comedi_device_file_info *info;
2484 struct device *csdev;
2485 unsigned i;
883db3d9 2486
a5011a26
HS		 2487 info = kmalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL);
2488 if (info == NULL)
2489 return -ENOMEM;
2490 info->device = dev;
2491 info->read_subdevice = s;
2492 info->write_subdevice = s;
2493 spin_lock(&comedi_file_info_table_lock);
2494 for (i = COMEDI_FIRST_SUBDEVICE_MINOR; i < COMEDI_NUM_MINORS; ++i) {
2495 if (comedi_file_info_table[i] == NULL) {
2496 comedi_file_info_table[i] = info;
2497 break;
2498 }
2499 }
2500 spin_unlock(&comedi_file_info_table_lock);
2501 if (i == COMEDI_NUM_MINORS) {
2502 kfree(info);
2503 printk(KERN_ERR
2504 "comedi: error: "
2505 "ran out of minor numbers for board device files.\n");
2506 return -EBUSY;
2507 }
2508 s->minor = i;
2509 csdev = device_create(comedi_class, dev->class_dev,
2510 MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i_subd%i",
2511 dev->minor, (int)(s - dev->subdevices));
2512 if (!IS_ERR(csdev))
2513 s->class_dev = csdev;
2514 dev_set_drvdata(csdev, info);
883db3d9 2515
a5011a26 2516 return i;
883db3d9
FMH		 2517}
2518
a5011a26 2519void comedi_free_subdevice_minor(struct comedi_subdevice *s)
883db3d9 2520{
a5011a26 2521 struct comedi_device_file_info *info;
883db3d9 2522
a5011a26
HS		 2523 if (s == NULL)
2524 return;
2525 if (s->minor < 0)
2526 return;
883db3d9 2527
a5011a26
HS		 2528 BUG_ON(s->minor >= COMEDI_NUM_MINORS);
2529 BUG_ON(s->minor < COMEDI_FIRST_SUBDEVICE_MINOR);
883db3d9 2530
a5011a26
HS		 2531 spin_lock(&comedi_file_info_table_lock);
2532 info = comedi_file_info_table[s->minor];
2533 comedi_file_info_table[s->minor] = NULL;
2534 spin_unlock(&comedi_file_info_table_lock);
883db3d9 2535
a5011a26
HS		 2536 if (s->class_dev) {
2537 device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor));
2538 s->class_dev = NULL;
883db3d9 2539 }
a5011a26 2540 kfree(info);
883db3d9
FMH		 2541}
2542
a5011a26
HS		 2543struct comedi_device_file_info *comedi_get_device_file_info(unsigned minor)
2544{
2545 struct comedi_device_file_info *info;
2546
2547 BUG_ON(minor >= COMEDI_NUM_MINORS);
2548 spin_lock(&comedi_file_info_table_lock);
2549 info = comedi_file_info_table[minor];
2550 spin_unlock(&comedi_file_info_table_lock);
2551 return info;
2552}
2553EXPORT_SYMBOL_GPL(comedi_get_device_file_info);
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