projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
staging: comedi: refactor comedi_free_board_minor()
[GitHub/mt8127/android_kernel_alcatel_ttab.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 51
ed9eccbe
DS		 52#ifdef CONFIG_COMEDI_DEBUG
53int comedi_debug;
18736438 54EXPORT_SYMBOL(comedi_debug);
4d7df821
IA		 55module_param(comedi_debug, int, S_IRUGO | S_IWUSR);
56MODULE_PARM_DESC(comedi_debug,
57 "enable comedi core and driver debugging if non-zero (default 0)"
58 );
ed9eccbe
DS		 59#endif
60
92d0127c 61static int comedi_num_legacy_minors;
4d7df821
IA		 62module_param(comedi_num_legacy_minors, int, S_IRUGO);
63MODULE_PARM_DESC(comedi_num_legacy_minors,
64 "number of comedi minor devices to reserve for non-auto-configured devices (default 0)"
65 );
66
234bb3c6 67unsigned int comedi_default_buf_size_kb = CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB;
4d7df821
IA		 68module_param(comedi_default_buf_size_kb, uint, S_IRUGO | S_IWUSR);
69MODULE_PARM_DESC(comedi_default_buf_size_kb,
70 "default asynchronous buffer size in KiB (default "
234bb3c6 71 __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB) ")");
4d7df821 72
234bb3c6
IA		 73unsigned int comedi_default_buf_maxsize_kb
74 = CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB;
4d7df821
IA		 75module_param(comedi_default_buf_maxsize_kb, uint, S_IRUGO | S_IWUSR);
76MODULE_PARM_DESC(comedi_default_buf_maxsize_kb,
77 "default maximum size of asynchronous buffer in KiB (default "
234bb3c6 78 __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB) ")");
1dd33ab8 79
cd6b7636 80struct comedi_file_info {
e79c8d21
HS		 81 struct comedi_device *device;
82 struct comedi_subdevice *read_subdevice;
83 struct comedi_subdevice *write_subdevice;
84 struct device *hardware_device;
85};
86
ed9eccbe 87static DEFINE_SPINLOCK(comedi_file_info_table_lock);
cd6b7636 88static struct comedi_file_info *comedi_file_info_table[COMEDI_NUM_MINORS];
476b8477 89
ed69335c 90static struct comedi_file_info *comedi_file_info_from_minor(unsigned minor)
87b1ad7a 91{
cd6b7636 92 struct comedi_file_info *info;
87b1ad7a
HS		 93
94 BUG_ON(minor >= COMEDI_NUM_MINORS);
95 spin_lock(&comedi_file_info_table_lock);
96 info = comedi_file_info_table[minor];
97 spin_unlock(&comedi_file_info_table_lock);
98 return info;
99}
100
ba1bcf6f
IA		 101static struct comedi_device *
102comedi_dev_from_file_info(struct comedi_file_info *info)
85104e9b 103{
85104e9b
HS		 104 return info ? info->device : NULL;
105}
ba1bcf6f
IA		 106
107struct comedi_device *comedi_dev_from_minor(unsigned minor)
108{
109 return comedi_dev_from_file_info(comedi_file_info_from_minor(minor));
110}
85104e9b
HS		 111EXPORT_SYMBOL_GPL(comedi_dev_from_minor);
112
43bd33f2 113static struct comedi_subdevice *
7d8a2567 114comedi_read_subdevice(const struct comedi_file_info *info)
43bd33f2
HS		 115{
116 if (info->read_subdevice)
117 return info->read_subdevice;
401d99de
HS		 118 if (info->device)
119 return info->device->read_subdev;
120 return NULL;
43bd33f2
HS		 121}
122
123static struct comedi_subdevice *
7d8a2567 124comedi_write_subdevice(const struct comedi_file_info *info)
43bd33f2
HS		 125{
126 if (info->write_subdevice)
127 return info->write_subdevice;
401d99de
HS		 128 if (info->device)
129 return info->device->write_subdev;
130 return NULL;
43bd33f2
HS		 131}
132
883db3d9
FMH		 133static int resize_async_buffer(struct comedi_device *dev,
134 struct comedi_subdevice *s,
a5011a26
HS		 135 struct comedi_async *async, unsigned new_size)
136{
137 int retval;
138
139 if (new_size > async->max_bufsize)
140 return -EPERM;
141
142 if (s->busy) {
143 DPRINTK("subdevice is busy, cannot resize buffer\n");
144 return -EBUSY;
145 }
146 if (async->mmap_count) {
147 DPRINTK("subdevice is mmapped, cannot resize buffer\n");
148 return -EBUSY;
149 }
150
151 if (!async->prealloc_buf)
152 return -EINVAL;
153
154 /* make sure buffer is an integral number of pages
155 * (we round up) */
156 new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK;
157
158 retval = comedi_buf_alloc(dev, s, new_size);
159 if (retval < 0)
160 return retval;
161
162 if (s->buf_change) {
163 retval = s->buf_change(dev, s, new_size);
164 if (retval < 0)
165 return retval;
166 }
167
168 DPRINTK("comedi%i subd %d buffer resized to %i bytes\n",
90a35c15 169 dev->minor, s->index, async->prealloc_bufsz);
a5011a26
HS		 170 return 0;
171}
172
173/* sysfs attribute files */
174
a5011a26
HS		 175static ssize_t show_max_read_buffer_kb(struct device *dev,
176 struct device_attribute *attr, char *buf)
177{
cd6b7636 178 struct comedi_file_info *info = dev_get_drvdata(dev);
7d8a2567 179 struct comedi_subdevice *s = comedi_read_subdevice(info);
72fd9fac 180 unsigned int size = 0;
a5011a26
HS		 181
182 mutex_lock(&info->device->mutex);
72fd9fac
HS		 183 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
184 size = s->async->max_bufsize / 1024;
a5011a26
HS		 185 mutex_unlock(&info->device->mutex);
186
72fd9fac 187 return snprintf(buf, PAGE_SIZE, "%i\n", size);
a5011a26
HS		 188}
189
190static ssize_t store_max_read_buffer_kb(struct device *dev,
191 struct device_attribute *attr,
192 const char *buf, size_t count)
193{
cd6b7636 194 struct comedi_file_info *info = dev_get_drvdata(dev);
7d8a2567 195 struct comedi_subdevice *s = comedi_read_subdevice(info);
72fd9fac
HS		 196 unsigned int size;
197 int err;
198
199 err = kstrtouint(buf, 10, &size);
200 if (err)
201 return err;
202 if (size > (UINT_MAX / 1024))
a5011a26 203 return -EINVAL;
72fd9fac 204 size *= 1024;
a5011a26
HS		 205
206 mutex_lock(&info->device->mutex);
72fd9fac
HS		 207 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
208 s->async->max_bufsize = size;
209 else
210 err = -EINVAL;
a5011a26
HS		 211 mutex_unlock(&info->device->mutex);
212
72fd9fac 213 return err ? err : count;
a5011a26
HS		 214}
215
a5011a26
HS		 216static ssize_t show_read_buffer_kb(struct device *dev,
217 struct device_attribute *attr, char *buf)
218{
cd6b7636 219 struct comedi_file_info *info = dev_get_drvdata(dev);
7d8a2567 220 struct comedi_subdevice *s = comedi_read_subdevice(info);
72fd9fac 221 unsigned int size = 0;
a5011a26
HS		 222
223 mutex_lock(&info->device->mutex);
72fd9fac
HS		 224 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
225 size = s->async->prealloc_bufsz / 1024;
a5011a26
HS		 226 mutex_unlock(&info->device->mutex);
227
72fd9fac 228 return snprintf(buf, PAGE_SIZE, "%i\n", size);
a5011a26
HS		 229}
230
231static ssize_t store_read_buffer_kb(struct device *dev,
232 struct device_attribute *attr,
233 const char *buf, size_t count)
234{
cd6b7636 235 struct comedi_file_info *info = dev_get_drvdata(dev);
7d8a2567 236 struct comedi_subdevice *s = comedi_read_subdevice(info);
72fd9fac
HS		 237 unsigned int size;
238 int err;
239
240 err = kstrtouint(buf, 10, &size);
241 if (err)
242 return err;
243 if (size > (UINT_MAX / 1024))
a5011a26 244 return -EINVAL;
72fd9fac 245 size *= 1024;
a5011a26
HS		 246
247 mutex_lock(&info->device->mutex);
72fd9fac
HS		 248 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
249 err = resize_async_buffer(info->device, s, s->async, size);
250 else
251 err = -EINVAL;
a5011a26
HS		 252 mutex_unlock(&info->device->mutex);
253
72fd9fac 254 return err ? err : count;
a5011a26 255}
883db3d9 256
a5011a26
HS		 257static ssize_t show_max_write_buffer_kb(struct device *dev,
258 struct device_attribute *attr,
259 char *buf)
260{
cd6b7636 261 struct comedi_file_info *info = dev_get_drvdata(dev);
7d8a2567 262 struct comedi_subdevice *s = comedi_write_subdevice(info);
72fd9fac 263 unsigned int size = 0;
a5011a26
HS		 264
265 mutex_lock(&info->device->mutex);
72fd9fac
HS		 266 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
267 size = s->async->max_bufsize / 1024;
a5011a26
HS		 268 mutex_unlock(&info->device->mutex);
269
72fd9fac 270 return snprintf(buf, PAGE_SIZE, "%i\n", size);
a5011a26
HS		 271}
272
273static ssize_t store_max_write_buffer_kb(struct device *dev,
274 struct device_attribute *attr,
275 const char *buf, size_t count)
276{
cd6b7636 277 struct comedi_file_info *info = dev_get_drvdata(dev);
7d8a2567 278 struct comedi_subdevice *s = comedi_write_subdevice(info);
72fd9fac
HS		 279 unsigned int size;
280 int err;
281
282 err = kstrtouint(buf, 10, &size);
283 if (err)
284 return err;
285 if (size > (UINT_MAX / 1024))
a5011a26 286 return -EINVAL;
72fd9fac 287 size *= 1024;
a5011a26
HS		 288
289 mutex_lock(&info->device->mutex);
72fd9fac
HS		 290 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
291 s->async->max_bufsize = size;
292 else
293 err = -EINVAL;
a5011a26
HS		 294 mutex_unlock(&info->device->mutex);
295
72fd9fac 296 return err ? err : count;
a5011a26
HS		 297}
298
a5011a26
HS		 299static ssize_t show_write_buffer_kb(struct device *dev,
300 struct device_attribute *attr, char *buf)
301{
cd6b7636 302 struct comedi_file_info *info = dev_get_drvdata(dev);
7d8a2567 303 struct comedi_subdevice *s = comedi_write_subdevice(info);
72fd9fac 304 unsigned int size = 0;
a5011a26
HS		 305
306 mutex_lock(&info->device->mutex);
72fd9fac
HS		 307 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
308 size = s->async->prealloc_bufsz / 1024;
a5011a26
HS		 309 mutex_unlock(&info->device->mutex);
310
72fd9fac 311 return snprintf(buf, PAGE_SIZE, "%i\n", size);
a5011a26
HS		 312}
313
314static ssize_t store_write_buffer_kb(struct device *dev,
315 struct device_attribute *attr,
316 const char *buf, size_t count)
317{
cd6b7636 318 struct comedi_file_info *info = dev_get_drvdata(dev);
7d8a2567 319 struct comedi_subdevice *s = comedi_write_subdevice(info);
72fd9fac
HS		 320 unsigned int size;
321 int err;
322
323 err = kstrtouint(buf, 10, &size);
324 if (err)
325 return err;
326 if (size > (UINT_MAX / 1024))
a5011a26 327 return -EINVAL;
72fd9fac 328 size *= 1024;
a5011a26
HS		 329
330 mutex_lock(&info->device->mutex);
72fd9fac
HS		 331 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
332 err = resize_async_buffer(info->device, s, s->async, size);
333 else
334 err = -EINVAL;
a5011a26
HS		 335 mutex_unlock(&info->device->mutex);
336
72fd9fac 337 return err ? err : count;
a5011a26
HS		 338}
339
fb60367d
HS		 340static struct device_attribute comedi_dev_attrs[] = {
341 __ATTR(max_read_buffer_kb, S_IRUGO | S_IWUSR,
342 show_max_read_buffer_kb, store_max_read_buffer_kb),
343 __ATTR(read_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP,
344 show_read_buffer_kb, store_read_buffer_kb),
345 __ATTR(max_write_buffer_kb, S_IRUGO | S_IWUSR,
346 show_max_write_buffer_kb, store_max_write_buffer_kb),
347 __ATTR(write_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP,
348 show_write_buffer_kb, store_write_buffer_kb),
349 __ATTR_NULL
a5011a26 350};
ed9eccbe 351
2aae0076
HS		 352static void comedi_set_subdevice_runflags(struct comedi_subdevice *s,
353 unsigned mask, unsigned bits)
354{
355 unsigned long flags;
356
357 spin_lock_irqsave(&s->spin_lock, flags);
358 s->runflags &= ~mask;
359 s->runflags |= (bits & mask);
360 spin_unlock_irqrestore(&s->spin_lock, flags);
361}
362
ade1764f 363static unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s)
74120719
HS		 364{
365 unsigned long flags;
366 unsigned runflags;
367
368 spin_lock_irqsave(&s->spin_lock, flags);
369 runflags = s->runflags;
370 spin_unlock_irqrestore(&s->spin_lock, flags);
371 return runflags;
372}
74120719 373
e0dac318
HS		 374bool comedi_is_subdevice_running(struct comedi_subdevice *s)
375{
376 unsigned runflags = comedi_get_subdevice_runflags(s);
377
378 return (runflags & SRF_RUNNING) ? true : false;
379}
380EXPORT_SYMBOL_GPL(comedi_is_subdevice_running);
381
c098c21a
HS		 382static bool comedi_is_subdevice_in_error(struct comedi_subdevice *s)
383{
384 unsigned runflags = comedi_get_subdevice_runflags(s);
385
386 return (runflags & SRF_ERROR) ? true : false;
387}
388
9682e28c
HS		 389static bool comedi_is_subdevice_idle(struct comedi_subdevice *s)
390{
391 unsigned runflags = comedi_get_subdevice_runflags(s);
392
393 return (runflags & (SRF_ERROR | SRF_RUNNING)) ? false : true;
394}
395
2aae0076
HS		 396/*
397 This function restores a subdevice to an idle state.
398 */
399static void do_become_nonbusy(struct comedi_device *dev,
400 struct comedi_subdevice *s)
401{
402 struct comedi_async *async = s->async;
403
404 comedi_set_subdevice_runflags(s, SRF_RUNNING, 0);
405 if (async) {
61c9fb0e 406 comedi_buf_reset(async);
2aae0076
HS		 407 async->inttrig = NULL;
408 kfree(async->cmd.chanlist);
409 async->cmd.chanlist = NULL;
410 } else {
411 dev_err(dev->class_dev,
412 "BUG: (?) do_become_nonbusy called with async=NULL\n");
413 }
414
415 s->busy = NULL;
416}
417
418static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
419{
420 int ret = 0;
421
f0124630 422 if (comedi_is_subdevice_running(s) && s->cancel)
2aae0076
HS		 423 ret = s->cancel(dev, s);
424
425 do_become_nonbusy(dev, s);
426
427 return ret;
428}
429
430static int is_device_busy(struct comedi_device *dev)
431{
432 struct comedi_subdevice *s;
433 int i;
434
435 if (!dev->attached)
436 return 0;
437
438 for (i = 0; i < dev->n_subdevices; i++) {
439 s = &dev->subdevices[i];
440 if (s->busy)
441 return 1;
442 if (s->async && s->async->mmap_count)
443 return 1;
444 }
445
446 return 0;
447}
448
ed9eccbe
DS		 449/*
450 COMEDI_DEVCONFIG
451 device config ioctl
452
453 arg:
454 pointer to devconfig structure
455
456 reads:
457 devconfig structure at arg
458
459 writes:
460 none
461*/
0a85b6f0 462static int do_devconfig_ioctl(struct comedi_device *dev,
92d0127c 463 struct comedi_devconfig __user *arg)
ed9eccbe 464{
0707bb04 465 struct comedi_devconfig it;
ed9eccbe 466 int ret;
ed9eccbe
DS		 467
468 if (!capable(CAP_SYS_ADMIN))
469 return -EPERM;
470
471 if (arg == NULL) {
472 if (is_device_busy(dev))
473 return -EBUSY;
476b8477 474 if (dev->attached) {
ed9eccbe
DS		 475 struct module *driver_module = dev->driver->module;
476 comedi_device_detach(dev);
477 module_put(driver_module);
478 }
479 return 0;
480 }
481
bc252fd1 482 if (copy_from_user(&it, arg, sizeof(it)))
ed9eccbe
DS		 483 return -EFAULT;
484
485 it.board_name[COMEDI_NAMELEN - 1] = 0;
486
d1843132
HS		 487 if (it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) {
488 dev_warn(dev->class_dev,
489 "comedi_config --init_data is deprecated\n");
490 return -EINVAL;
ed9eccbe
DS		 491 }
492
493 ret = comedi_device_attach(dev, &it);
476b8477
GKH		 494 if (ret == 0) {
495 if (!try_module_get(dev->driver->module)) {
ed9eccbe 496 comedi_device_detach(dev);
abae41e6 497 ret = -ENOSYS;
ed9eccbe
DS		 498 }
499 }
500
ed9eccbe
DS		 501 return ret;
502}
503
504/*
505 COMEDI_BUFCONFIG
506 buffer configuration ioctl
507
508 arg:
509 pointer to bufconfig structure
510
511 reads:
512 bufconfig at arg
513
514 writes:
515 modified bufconfig at arg
516
517*/
92d0127c
GKH		 518static int do_bufconfig_ioctl(struct comedi_device *dev,
519 struct comedi_bufconfig __user *arg)
ed9eccbe 520{
be6aba4a 521 struct comedi_bufconfig bc;
d163679c 522 struct comedi_async *async;
34c43922 523 struct comedi_subdevice *s;
883db3d9 524 int retval = 0;
ed9eccbe 525
bc252fd1 526 if (copy_from_user(&bc, arg, sizeof(bc)))
ed9eccbe
DS		 527 return -EFAULT;
528
529 if (bc.subdevice >= dev->n_subdevices || bc.subdevice < 0)
530 return -EINVAL;
531
b077f2cd 532 s = &dev->subdevices[bc.subdevice];
ed9eccbe
DS		 533 async = s->async;
534
535 if (!async) {
536 DPRINTK("subdevice does not have async capability\n");
537 bc.size = 0;
538 bc.maximum_size = 0;
539 goto copyback;
540 }
541
542 if (bc.maximum_size) {
543 if (!capable(CAP_SYS_ADMIN))
544 return -EPERM;
545
546 async->max_bufsize = bc.maximum_size;
547 }
548
549 if (bc.size) {
883db3d9
FMH		 550 retval = resize_async_buffer(dev, s, async, bc.size);
551 if (retval < 0)
552 return retval;
ed9eccbe
DS		 553 }
554
555 bc.size = async->prealloc_bufsz;
556 bc.maximum_size = async->max_bufsize;
557
476b8477 558copyback:
bc252fd1 559 if (copy_to_user(arg, &bc, sizeof(bc)))
ed9eccbe
DS		 560 return -EFAULT;
561
562 return 0;
563}
564
565/*
566 COMEDI_DEVINFO
567 device info ioctl
568
569 arg:
570 pointer to devinfo structure
571
572 reads:
573 none
574
575 writes:
576 devinfo structure
577
578*/
0a85b6f0 579static int do_devinfo_ioctl(struct comedi_device *dev,
92d0127c
GKH		 580 struct comedi_devinfo __user *arg,
581 struct file *file)
ed9eccbe 582{
6131ffaa 583 const unsigned minor = iminor(file_inode(file));
ed69335c 584 struct comedi_file_info *info = comedi_file_info_from_minor(minor);
0e700923
HS		 585 struct comedi_subdevice *s;
586 struct comedi_devinfo devinfo;
ed9eccbe
DS		 587
588 memset(&devinfo, 0, sizeof(devinfo));
589
590 /* fill devinfo structure */
591 devinfo.version_code = COMEDI_VERSION_CODE;
592 devinfo.n_subdevs = dev->n_subdevices;
819cbb12
VK		 593 strlcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN);
594 strlcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN);
ed9eccbe 595
0e700923
HS		 596 s = comedi_read_subdevice(info);
597 if (s)
90a35c15 598 devinfo.read_subdevice = s->index;
476b8477 599 else
ed9eccbe 600 devinfo.read_subdevice = -1;
476b8477 601
0e700923
HS		 602 s = comedi_write_subdevice(info);
603 if (s)
90a35c15 604 devinfo.write_subdevice = s->index;
476b8477 605 else
ed9eccbe 606 devinfo.write_subdevice = -1;
ed9eccbe 607
bc252fd1 608 if (copy_to_user(arg, &devinfo, sizeof(devinfo)))
ed9eccbe
DS		 609 return -EFAULT;
610
611 return 0;
612}
613
614/*
615 COMEDI_SUBDINFO
616 subdevice info ioctl
617
618 arg:
619 pointer to array of subdevice info structures
620
621 reads:
622 none
623
624 writes:
625 array of subdevice info structures at arg
626
627*/
0a85b6f0 628static int do_subdinfo_ioctl(struct comedi_device *dev,
92d0127c 629 struct comedi_subdinfo __user *arg, void *file)
ed9eccbe
DS		 630{
631 int ret, i;
bd52efbb 632 struct comedi_subdinfo *tmp, *us;
34c43922 633 struct comedi_subdevice *s;
ed9eccbe 634
bc252fd1 635 tmp = kcalloc(dev->n_subdevices, sizeof(*tmp), GFP_KERNEL);
ed9eccbe
DS		 636 if (!tmp)
637 return -ENOMEM;
638
639 /* fill subdinfo structs */
640 for (i = 0; i < dev->n_subdevices; i++) {
b077f2cd 641 s = &dev->subdevices[i];
ed9eccbe
DS		 642 us = tmp + i;
643
644 us->type = s->type;
645 us->n_chan = s->n_chan;
646 us->subd_flags = s->subdev_flags;
f0124630 647 if (comedi_is_subdevice_running(s))
ed9eccbe
DS		 648 us->subd_flags |= SDF_RUNNING;
649#define TIMER_nanosec 5 /* backwards compatibility */
650 us->timer_type = TIMER_nanosec;
651 us->len_chanlist = s->len_chanlist;
652 us->maxdata = s->maxdata;
653 if (s->range_table) {
654 us->range_type =
476b8477 655 (i << 24) | (0 << 16) | (s->range_table->length);
ed9eccbe
DS		 656 } else {
657 us->range_type = 0; /* XXX */
658 }
659 us->flags = s->flags;
660
661 if (s->busy)
662 us->subd_flags |= SDF_BUSY;
663 if (s->busy == file)
664 us->subd_flags |= SDF_BUSY_OWNER;
665 if (s->lock)
666 us->subd_flags |= SDF_LOCKED;
667 if (s->lock == file)
668 us->subd_flags |= SDF_LOCK_OWNER;
669 if (!s->maxdata && s->maxdata_list)
670 us->subd_flags |= SDF_MAXDATA;
671 if (s->flaglist)
672 us->subd_flags |= SDF_FLAGS;
673 if (s->range_table_list)
674 us->subd_flags |= SDF_RANGETYPE;
675 if (s->do_cmd)
676 us->subd_flags |= SDF_CMD;
677
678 if (s->insn_bits != &insn_inval)
679 us->insn_bits_support = COMEDI_SUPPORTED;
680 else
681 us->insn_bits_support = COMEDI_UNSUPPORTED;
682
683 us->settling_time_0 = s->settling_time_0;
684 }
685
bc252fd1 686 ret = copy_to_user(arg, tmp, dev->n_subdevices * sizeof(*tmp));
ed9eccbe
DS		 687
688 kfree(tmp);
689
690 return ret ? -EFAULT : 0;
691}
692
693/*
694 COMEDI_CHANINFO
695 subdevice info ioctl
696
697 arg:
698 pointer to chaninfo structure
699
700 reads:
701 chaninfo structure at arg
702
703 writes:
704 arrays at elements of chaninfo structure
705
706*/
0a85b6f0 707static int do_chaninfo_ioctl(struct comedi_device *dev,
92d0127c 708 struct comedi_chaninfo __user *arg)
ed9eccbe 709{
34c43922 710 struct comedi_subdevice *s;
a18b416d 711 struct comedi_chaninfo it;
ed9eccbe 712
bc252fd1 713 if (copy_from_user(&it, arg, sizeof(it)))
ed9eccbe
DS		 714 return -EFAULT;
715
716 if (it.subdev >= dev->n_subdevices)
717 return -EINVAL;
b077f2cd 718 s = &dev->subdevices[it.subdev];
ed9eccbe
DS		 719
720 if (it.maxdata_list) {
721 if (s->maxdata || !s->maxdata_list)
722 return -EINVAL;
723 if (copy_to_user(it.maxdata_list, s->maxdata_list,
790c5541 724 s->n_chan * sizeof(unsigned int)))
ed9eccbe
DS		 725 return -EFAULT;
726 }
727
728 if (it.flaglist) {
729 if (!s->flaglist)
730 return -EINVAL;
731 if (copy_to_user(it.flaglist, s->flaglist,
476b8477 732 s->n_chan * sizeof(unsigned int)))
ed9eccbe
DS		 733 return -EFAULT;
734 }
735
736 if (it.rangelist) {
737 int i;
738
739 if (!s->range_table_list)
740 return -EINVAL;
741 for (i = 0; i < s->n_chan; i++) {
742 int x;
743
744 x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) |
476b8477 745 (s->range_table_list[i]->length);
81604d43
VK		 746 if (put_user(x, it.rangelist + i))
747 return -EFAULT;
ed9eccbe 748 }
476b8477
GKH		 749#if 0
750 if (copy_to_user(it.rangelist, s->range_type_list,
0a85b6f0 751 s->n_chan * sizeof(unsigned int)))
476b8477
GKH		 752 return -EFAULT;
753#endif
ed9eccbe
DS		 754 }
755
756 return 0;
757}
758
759 /*
760 COMEDI_BUFINFO
761 buffer information ioctl
762
763 arg:
764 pointer to bufinfo structure
765
766 reads:
767 bufinfo at arg
768
769 writes:
770 modified bufinfo at arg
771
772 */
92d0127c 773static int do_bufinfo_ioctl(struct comedi_device *dev,
53fa827e 774 struct comedi_bufinfo __user *arg, void *file)
ed9eccbe 775{
9aa5339a 776 struct comedi_bufinfo bi;
34c43922 777 struct comedi_subdevice *s;
d163679c 778 struct comedi_async *async;
ed9eccbe 779
bc252fd1 780 if (copy_from_user(&bi, arg, sizeof(bi)))
ed9eccbe
DS		 781 return -EFAULT;
782
783 if (bi.subdevice >= dev->n_subdevices || bi.subdevice < 0)
784 return -EINVAL;
785
b077f2cd 786 s = &dev->subdevices[bi.subdevice];
53fa827e
IA		 787
788 if (s->lock && s->lock != file)
789 return -EACCES;
790
ed9eccbe
DS		 791 async = s->async;
792
793 if (!async) {
794 DPRINTK("subdevice does not have async capability\n");
795 bi.buf_write_ptr = 0;
796 bi.buf_read_ptr = 0;
797 bi.buf_write_count = 0;
798 bi.buf_read_count = 0;
4772c018
IA		 799 bi.bytes_read = 0;
800 bi.bytes_written = 0;
ed9eccbe
DS		 801 goto copyback;
802 }
53fa827e
IA		 803 if (!s->busy) {
804 bi.bytes_read = 0;
805 bi.bytes_written = 0;
806 goto copyback_position;
807 }
808 if (s->busy != file)
809 return -EACCES;
ed9eccbe
DS		 810
811 if (bi.bytes_read && (s->subdev_flags & SDF_CMD_READ)) {
812 bi.bytes_read = comedi_buf_read_alloc(async, bi.bytes_read);
813 comedi_buf_read_free(async, bi.bytes_read);
814
9682e28c
HS		 815 if (comedi_is_subdevice_idle(s) &&
816 async->buf_write_count == async->buf_read_count) {
ed9eccbe
DS		 817 do_become_nonbusy(dev, s);
818 }
819 }
820
821 if (bi.bytes_written && (s->subdev_flags & SDF_CMD_WRITE)) {
822 bi.bytes_written =
476b8477 823 comedi_buf_write_alloc(async, bi.bytes_written);
ed9eccbe
DS		 824 comedi_buf_write_free(async, bi.bytes_written);
825 }
826
53fa827e 827copyback_position:
ed9eccbe
DS		 828 bi.buf_write_count = async->buf_write_count;
829 bi.buf_write_ptr = async->buf_write_ptr;
830 bi.buf_read_count = async->buf_read_count;
831 bi.buf_read_ptr = async->buf_read_ptr;
832
476b8477 833copyback:
bc252fd1 834 if (copy_to_user(arg, &bi, sizeof(bi)))
ed9eccbe
DS		 835 return -EFAULT;
836
837 return 0;
838}
839
0a85b6f0
MT		 840static int check_insn_config_length(struct comedi_insn *insn,
841 unsigned int *data)
ed9eccbe 842{
476b8477
GKH		 843 if (insn->n < 1)
844 return -EINVAL;
ed9eccbe
DS		 845
846 switch (data[0]) {
847 case INSN_CONFIG_DIO_OUTPUT:
848 case INSN_CONFIG_DIO_INPUT:
849 case INSN_CONFIG_DISARM:
850 case INSN_CONFIG_RESET:
851 if (insn->n == 1)
852 return 0;
853 break;
854 case INSN_CONFIG_ARM:
855 case INSN_CONFIG_DIO_QUERY:
856 case INSN_CONFIG_BLOCK_SIZE:
857 case INSN_CONFIG_FILTER:
858 case INSN_CONFIG_SERIAL_CLOCK:
859 case INSN_CONFIG_BIDIRECTIONAL_DATA:
860 case INSN_CONFIG_ALT_SOURCE:
861 case INSN_CONFIG_SET_COUNTER_MODE:
862 case INSN_CONFIG_8254_READ_STATUS:
863 case INSN_CONFIG_SET_ROUTING:
864 case INSN_CONFIG_GET_ROUTING:
865 case INSN_CONFIG_GET_PWM_STATUS:
866 case INSN_CONFIG_PWM_SET_PERIOD:
867 case INSN_CONFIG_PWM_GET_PERIOD:
868 if (insn->n == 2)
869 return 0;
870 break;
871 case INSN_CONFIG_SET_GATE_SRC:
872 case INSN_CONFIG_GET_GATE_SRC:
873 case INSN_CONFIG_SET_CLOCK_SRC:
874 case INSN_CONFIG_GET_CLOCK_SRC:
875 case INSN_CONFIG_SET_OTHER_SRC:
876 case INSN_CONFIG_GET_COUNTER_STATUS:
877 case INSN_CONFIG_PWM_SET_H_BRIDGE:
878 case INSN_CONFIG_PWM_GET_H_BRIDGE:
879 case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE:
880 if (insn->n == 3)
881 return 0;
882 break;
883 case INSN_CONFIG_PWM_OUTPUT:
884 case INSN_CONFIG_ANALOG_TRIG:
885 if (insn->n == 5)
886 return 0;
887 break;
b0a2b6d8
IA		 888 case INSN_CONFIG_DIGITAL_TRIG:
889 if (insn->n == 6)
890 return 0;
891 break;
0a85b6f0
MT		 892 /* by default we allow the insn since we don't have checks for
893 * all possible cases yet */
ed9eccbe 894 default:
4f870fe6
IA		 895 pr_warn("comedi: No check for data length of config insn id %i is implemented.\n",
896 data[0]);
897 pr_warn("comedi: Add a check to %s in %s.\n",
898 __func__, __FILE__);
899 pr_warn("comedi: Assuming n=%i is correct.\n", insn->n);
ed9eccbe 900 return 0;
ed9eccbe
DS		 901 }
902 return -EINVAL;
903}
904
0a85b6f0
MT		 905static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn,
906 unsigned int *data, void *file)
ed9eccbe 907{
34c43922 908 struct comedi_subdevice *s;
ed9eccbe
DS		 909 int ret = 0;
910 int i;
911
912 if (insn->insn & INSN_MASK_SPECIAL) {
913 /* a non-subdevice instruction */
914
915 switch (insn->insn) {
916 case INSN_GTOD:
917 {
918 struct timeval tv;
919
920 if (insn->n != 2) {
921 ret = -EINVAL;
922 break;
923 }
924
925 do_gettimeofday(&tv);
926 data[0] = tv.tv_sec;
927 data[1] = tv.tv_usec;
928 ret = 2;
929
930 break;
931 }
932 case INSN_WAIT:
933 if (insn->n != 1 || data[0] >= 100000) {
934 ret = -EINVAL;
935 break;
936 }
937 udelay(data[0] / 1000);
938 ret = 1;
939 break;
940 case INSN_INTTRIG:
941 if (insn->n != 1) {
942 ret = -EINVAL;
943 break;
944 }
945 if (insn->subdev >= dev->n_subdevices) {
946 DPRINTK("%d not usable subdevice\n",
947 insn->subdev);
948 ret = -EINVAL;
949 break;
950 }
b077f2cd 951 s = &dev->subdevices[insn->subdev];
ed9eccbe
DS		 952 if (!s->async) {
953 DPRINTK("no async\n");
954 ret = -EINVAL;
955 break;
956 }
957 if (!s->async->inttrig) {
958 DPRINTK("no inttrig\n");
959 ret = -EAGAIN;
960 break;
961 }
5d06e3df 962 ret = s->async->inttrig(dev, s, data[0]);
ed9eccbe
DS		 963 if (ret >= 0)
964 ret = 1;
965 break;
966 default:
967 DPRINTK("invalid insn\n");
968 ret = -EINVAL;
969 break;
970 }
971 } else {
972 /* a subdevice instruction */
790c5541 973 unsigned int maxdata;
ed9eccbe
DS		 974
975 if (insn->subdev >= dev->n_subdevices) {
976 DPRINTK("subdevice %d out of range\n", insn->subdev);
977 ret = -EINVAL;
978 goto out;
979 }
b077f2cd 980 s = &dev->subdevices[insn->subdev];
ed9eccbe
DS		 981
982 if (s->type == COMEDI_SUBD_UNUSED) {
983 DPRINTK("%d not usable subdevice\n", insn->subdev);
984 ret = -EIO;
985 goto out;
986 }
987
988 /* are we locked? (ioctl lock) */
989 if (s->lock && s->lock != file) {
990 DPRINTK("device locked\n");
991 ret = -EACCES;
992 goto out;
993 }
994
0fd0ca75 995 ret = comedi_check_chanlist(s, 1, &insn->chanspec);
476b8477 996 if (ret < 0) {
ed9eccbe
DS		 997 ret = -EINVAL;
998 DPRINTK("bad chanspec\n");
999 goto out;
1000 }
1001
1002 if (s->busy) {
1003 ret = -EBUSY;
1004 goto out;
1005 }
1006 /* This looks arbitrary. It is. */
1007 s->busy = &parse_insn;
1008 switch (insn->insn) {
1009 case INSN_READ:
1010 ret = s->insn_read(dev, s, insn, data);
1011 break;
1012 case INSN_WRITE:
1013 maxdata = s->maxdata_list
476b8477
GKH		 1014 ? s->maxdata_list[CR_CHAN(insn->chanspec)]
1015 : s->maxdata;
ed9eccbe
DS		 1016 for (i = 0; i < insn->n; ++i) {
1017 if (data[i] > maxdata) {
1018 ret = -EINVAL;
1019 DPRINTK("bad data value(s)\n");
1020 break;
1021 }
1022 }
1023 if (ret == 0)
1024 ret = s->insn_write(dev, s, insn, data);
1025 break;
1026 case INSN_BITS:
1027 if (insn->n != 2) {
1028 ret = -EINVAL;
2f644ccf
IA		 1029 } else {
1030 /* Most drivers ignore the base channel in
1031 * insn->chanspec. Fix this here if
1032 * the subdevice has <= 32 channels. */
1033 unsigned int shift;
1034 unsigned int orig_mask;
1035
1036 orig_mask = data[0];
1037 if (s->n_chan <= 32) {
1038 shift = CR_CHAN(insn->chanspec);
1039 if (shift > 0) {
1040 insn->chanspec = 0;
1041 data[0] <<= shift;
1042 data[1] <<= shift;
1043 }
1044 } else
1045 shift = 0;
1046 ret = s->insn_bits(dev, s, insn, data);
1047 data[0] = orig_mask;
1048 if (shift > 0)
1049 data[1] >>= shift;
ed9eccbe 1050 }
ed9eccbe
DS		 1051 break;
1052 case INSN_CONFIG:
1053 ret = check_insn_config_length(insn, data);
1054 if (ret)
1055 break;
1056 ret = s->insn_config(dev, s, insn, data);
1057 break;
1058 default:
1059 ret = -EINVAL;
1060 break;
1061 }
1062
1063 s->busy = NULL;
1064 }
1065
476b8477 1066out:
ed9eccbe
DS		 1067 return ret;
1068}
1069
5b6cbd87
HS		 1070/*
1071 * COMEDI_INSNLIST
1072 * synchronous instructions
1073 *
1074 * arg:
1075 * pointer to sync cmd structure
1076 *
1077 * reads:
1078 * sync cmd struct at arg
1079 * instruction list
1080 * data (for writes)
1081 *
1082 * writes:
1083 * data (for reads)
1084 */
1085/* arbitrary limits */
1086#define MAX_SAMPLES 256
1087static int do_insnlist_ioctl(struct comedi_device *dev,
1088 struct comedi_insnlist __user *arg, void *file)
1089{
1090 struct comedi_insnlist insnlist;
1091 struct comedi_insn *insns = NULL;
1092 unsigned int *data = NULL;
1093 int i = 0;
1094 int ret = 0;
1095
1096 if (copy_from_user(&insnlist, arg, sizeof(insnlist)))
1097 return -EFAULT;
1098
1099 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL);
1100 if (!data) {
1101 DPRINTK("kmalloc failed\n");
1102 ret = -ENOMEM;
1103 goto error;
1104 }
1105
1106 insns = kcalloc(insnlist.n_insns, sizeof(*insns), GFP_KERNEL);
1107 if (!insns) {
1108 DPRINTK("kmalloc failed\n");
1109 ret = -ENOMEM;
1110 goto error;
1111 }
1112
1113 if (copy_from_user(insns, insnlist.insns,
1114 sizeof(*insns) * insnlist.n_insns)) {
1115 DPRINTK("copy_from_user failed\n");
1116 ret = -EFAULT;
1117 goto error;
1118 }
1119
1120 for (i = 0; i < insnlist.n_insns; i++) {
1121 if (insns[i].n > MAX_SAMPLES) {
1122 DPRINTK("number of samples too large\n");
1123 ret = -EINVAL;
1124 goto error;
1125 }
1126 if (insns[i].insn & INSN_MASK_WRITE) {
1127 if (copy_from_user(data, insns[i].data,
1128 insns[i].n * sizeof(unsigned int))) {
1129 DPRINTK("copy_from_user failed\n");
1130 ret = -EFAULT;
1131 goto error;
1132 }
1133 }
1134 ret = parse_insn(dev, insns + i, data, file);
1135 if (ret < 0)
1136 goto error;
1137 if (insns[i].insn & INSN_MASK_READ) {
1138 if (copy_to_user(insns[i].data, data,
1139 insns[i].n * sizeof(unsigned int))) {
1140 DPRINTK("copy_to_user failed\n");
1141 ret = -EFAULT;
1142 goto error;
1143 }
1144 }
1145 if (need_resched())
1146 schedule();
1147 }
1148
1149error:
1150 kfree(insns);
1151 kfree(data);
1152
1153 if (ret < 0)
1154 return ret;
1155 return i;
1156}
1157
ed9eccbe 1158/*
20617f22
PDP		 1159 * COMEDI_INSN
1160 * synchronous instructions
ed9eccbe 1161 *
20617f22
PDP		 1162 * arg:
1163 * pointer to insn
ed9eccbe 1164 *
20617f22
PDP		 1165 * reads:
1166 * struct comedi_insn struct at arg
1167 * data (for writes)
ed9eccbe 1168 *
20617f22
PDP		 1169 * writes:
1170 * data (for reads)
ed9eccbe 1171 */
92d0127c
GKH		 1172static int do_insn_ioctl(struct comedi_device *dev,
1173 struct comedi_insn __user *arg, void *file)
ed9eccbe 1174{
90035c08 1175 struct comedi_insn insn;
790c5541 1176 unsigned int *data = NULL;
ed9eccbe
DS		 1177 int ret = 0;
1178
790c5541 1179 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL);
ed9eccbe
DS		 1180 if (!data) {
1181 ret = -ENOMEM;
1182 goto error;
1183 }
1184
bc252fd1 1185 if (copy_from_user(&insn, arg, sizeof(insn))) {
ed9eccbe
DS		 1186 ret = -EFAULT;
1187 goto error;
1188 }
1189
1190 /* This is where the behavior of insn and insnlist deviate. */
1191 if (insn.n > MAX_SAMPLES)
1192 insn.n = MAX_SAMPLES;
1193 if (insn.insn & INSN_MASK_WRITE) {
21fe2eea
M		 1194 if (copy_from_user(data,
1195 insn.data,
1196 insn.n * sizeof(unsigned int))) {
ed9eccbe
DS		 1197 ret = -EFAULT;
1198 goto error;
1199 }
1200 }
1201 ret = parse_insn(dev, &insn, data, file);
1202 if (ret < 0)
1203 goto error;
1204 if (insn.insn & INSN_MASK_READ) {
21fe2eea
M		 1205 if (copy_to_user(insn.data,
1206 data,
1207 insn.n * sizeof(unsigned int))) {
ed9eccbe
DS		 1208 ret = -EFAULT;
1209 goto error;
1210 }
1211 }
1212 ret = insn.n;
1213
476b8477
GKH		 1214error:
1215 kfree(data);
ed9eccbe
DS		 1216
1217 return ret;
1218}
1219
92d0127c 1220static int do_cmd_ioctl(struct comedi_device *dev,
cbe01f72 1221 struct comedi_cmd __user *arg, void *file)
ed9eccbe 1222{
88bc0574 1223 struct comedi_cmd cmd;
34c43922 1224 struct comedi_subdevice *s;
d163679c 1225 struct comedi_async *async;
ed9eccbe 1226 int ret = 0;
95bc359f 1227 unsigned int __user *user_chanlist;
ed9eccbe 1228
bc252fd1 1229 if (copy_from_user(&cmd, arg, sizeof(cmd))) {
ed9eccbe
DS		 1230 DPRINTK("bad cmd address\n");
1231 return -EFAULT;
1232 }
476b8477 1233 /* save user's chanlist pointer so it can be restored later */
95bc359f 1234 user_chanlist = (unsigned int __user *)cmd.chanlist;
ed9eccbe 1235
88bc0574
HS		 1236 if (cmd.subdev >= dev->n_subdevices) {
1237 DPRINTK("%d no such subdevice\n", cmd.subdev);
ed9eccbe
DS		 1238 return -ENODEV;
1239 }
1240
88bc0574 1241 s = &dev->subdevices[cmd.subdev];
ed9eccbe
DS		 1242 async = s->async;
1243
1244 if (s->type == COMEDI_SUBD_UNUSED) {
88bc0574 1245 DPRINTK("%d not valid subdevice\n", cmd.subdev);
ed9eccbe
DS		 1246 return -EIO;
1247 }
1248
1249 if (!s->do_cmd || !s->do_cmdtest || !s->async) {
1250 DPRINTK("subdevice %i does not support commands\n",
88bc0574 1251 cmd.subdev);
ed9eccbe
DS		 1252 return -EIO;
1253 }
1254
1255 /* are we locked? (ioctl lock) */
1256 if (s->lock && s->lock != file) {
1257 DPRINTK("subdevice locked\n");
1258 return -EACCES;
1259 }
1260
1261 /* are we busy? */
1262 if (s->busy) {
1263 DPRINTK("subdevice busy\n");
1264 return -EBUSY;
1265 }
1266 s->busy = file;
1267
1268 /* make sure channel/gain list isn't too long */
88bc0574 1269 if (cmd.chanlist_len > s->len_chanlist) {
ed9eccbe 1270 DPRINTK("channel/gain list too long %u > %d\n",
88bc0574 1271 cmd.chanlist_len, s->len_chanlist);
ed9eccbe
DS		 1272 ret = -EINVAL;
1273 goto cleanup;
1274 }
1275
1276 /* make sure channel/gain list isn't too short */
88bc0574 1277 if (cmd.chanlist_len < 1) {
ed9eccbe 1278 DPRINTK("channel/gain list too short %u < 1\n",
88bc0574 1279 cmd.chanlist_len);
ed9eccbe
DS		 1280 ret = -EINVAL;
1281 goto cleanup;
1282 }
1283
88bc0574 1284 async->cmd = cmd;
ed9eccbe
DS		 1285 async->cmd.data = NULL;
1286 /* load channel/gain list */
1287 async->cmd.chanlist =
476b8477 1288 kmalloc(async->cmd.chanlist_len * sizeof(int), GFP_KERNEL);
ed9eccbe
DS		 1289 if (!async->cmd.chanlist) {
1290 DPRINTK("allocation failed\n");
1291 ret = -ENOMEM;
1292 goto cleanup;
1293 }
1294
95bc359f 1295 if (copy_from_user(async->cmd.chanlist, user_chanlist,
476b8477 1296 async->cmd.chanlist_len * sizeof(int))) {
ed9eccbe
DS		 1297 DPRINTK("fault reading chanlist\n");
1298 ret = -EFAULT;
1299 goto cleanup;
1300 }
1301
1302 /* make sure each element in channel/gain list is valid */
21fe2eea
M		 1303 ret = comedi_check_chanlist(s,
1304 async->cmd.chanlist_len,
1305 async->cmd.chanlist);
476b8477 1306 if (ret < 0) {
ed9eccbe
DS		 1307 DPRINTK("bad chanlist\n");
1308 goto cleanup;
1309 }
1310
1311 ret = s->do_cmdtest(dev, s, &async->cmd);
1312
1313 if (async->cmd.flags & TRIG_BOGUS || ret) {
1314 DPRINTK("test returned %d\n", ret);
88bc0574 1315 cmd = async->cmd;
476b8477 1316 /* restore chanlist pointer before copying back */
95bc359f 1317 cmd.chanlist = (unsigned int __force *)user_chanlist;
88bc0574 1318 cmd.data = NULL;
bc252fd1 1319 if (copy_to_user(arg, &cmd, sizeof(cmd))) {
ed9eccbe
DS		 1320 DPRINTK("fault writing cmd\n");
1321 ret = -EFAULT;
1322 goto cleanup;
1323 }
1324 ret = -EAGAIN;
1325 goto cleanup;
1326 }
1327
1328 if (!async->prealloc_bufsz) {
1329 ret = -ENOMEM;
1330 DPRINTK("no buffer (?)\n");
1331 goto cleanup;
1332 }
1333
61c9fb0e 1334 comedi_buf_reset(async);
ed9eccbe
DS		 1335
1336 async->cb_mask =
476b8477
GKH		 1337 COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR |
1338 COMEDI_CB_OVERFLOW;
1339 if (async->cmd.flags & TRIG_WAKE_EOS)
ed9eccbe 1340 async->cb_mask |= COMEDI_CB_EOS;
ed9eccbe
DS		 1341
1342 comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING);
1343
ed9eccbe
DS		 1344 ret = s->do_cmd(dev, s);
1345 if (ret == 0)
1346 return 0;
1347
476b8477 1348cleanup:
ed9eccbe
DS		 1349 do_become_nonbusy(dev, s);
1350
1351 return ret;
1352}
1353
1354/*
1355 COMEDI_CMDTEST
1356 command testing ioctl
1357
1358 arg:
1359 pointer to cmd structure
1360
1361 reads:
1362 cmd structure at arg
1363 channel/range list
1364
1365 writes:
1366 modified cmd structure at arg
1367
1368*/
92d0127c
GKH		 1369static int do_cmdtest_ioctl(struct comedi_device *dev,
1370 struct comedi_cmd __user *arg, void *file)
ed9eccbe 1371{
f8348677 1372 struct comedi_cmd cmd;
34c43922 1373 struct comedi_subdevice *s;
ed9eccbe
DS		 1374 int ret = 0;
1375 unsigned int *chanlist = NULL;
95bc359f 1376 unsigned int __user *user_chanlist;
ed9eccbe 1377
bc252fd1 1378 if (copy_from_user(&cmd, arg, sizeof(cmd))) {
ed9eccbe
DS		 1379 DPRINTK("bad cmd address\n");
1380 return -EFAULT;
1381 }
476b8477 1382 /* save user's chanlist pointer so it can be restored later */
95bc359f 1383 user_chanlist = (unsigned int __user *)cmd.chanlist;
ed9eccbe 1384
f8348677
HS		 1385 if (cmd.subdev >= dev->n_subdevices) {
1386 DPRINTK("%d no such subdevice\n", cmd.subdev);
ed9eccbe
DS		 1387 return -ENODEV;
1388 }
1389
f8348677 1390 s = &dev->subdevices[cmd.subdev];
ed9eccbe 1391 if (s->type == COMEDI_SUBD_UNUSED) {
f8348677 1392 DPRINTK("%d not valid subdevice\n", cmd.subdev);
ed9eccbe
DS		 1393 return -EIO;
1394 }
1395
1396 if (!s->do_cmd || !s->do_cmdtest) {
1397 DPRINTK("subdevice %i does not support commands\n",
f8348677 1398 cmd.subdev);
ed9eccbe
DS		 1399 return -EIO;
1400 }
1401
1402 /* make sure channel/gain list isn't too long */
f8348677 1403 if (cmd.chanlist_len > s->len_chanlist) {
ed9eccbe 1404 DPRINTK("channel/gain list too long %d > %d\n",
f8348677 1405 cmd.chanlist_len, s->len_chanlist);
ed9eccbe
DS		 1406 ret = -EINVAL;
1407 goto cleanup;
1408 }
1409
1410 /* load channel/gain list */
f8348677 1411 if (cmd.chanlist) {
ed9eccbe 1412 chanlist =
f8348677 1413 kmalloc(cmd.chanlist_len * sizeof(int), GFP_KERNEL);
ed9eccbe
DS		 1414 if (!chanlist) {
1415 DPRINTK("allocation failed\n");
1416 ret = -ENOMEM;
1417 goto cleanup;
1418 }
1419
95bc359f 1420 if (copy_from_user(chanlist, user_chanlist,
f8348677 1421 cmd.chanlist_len * sizeof(int))) {
ed9eccbe
DS		 1422 DPRINTK("fault reading chanlist\n");
1423 ret = -EFAULT;
1424 goto cleanup;
1425 }
1426
1427 /* make sure each element in channel/gain list is valid */
f8348677 1428 ret = comedi_check_chanlist(s, cmd.chanlist_len, chanlist);
476b8477 1429 if (ret < 0) {
ed9eccbe
DS		 1430 DPRINTK("bad chanlist\n");
1431 goto cleanup;
1432 }
1433
f8348677 1434 cmd.chanlist = chanlist;
ed9eccbe
DS		 1435 }
1436
f8348677 1437 ret = s->do_cmdtest(dev, s, &cmd);
ed9eccbe 1438
476b8477 1439 /* restore chanlist pointer before copying back */
95bc359f 1440 cmd.chanlist = (unsigned int __force *)user_chanlist;
ed9eccbe 1441
bc252fd1 1442 if (copy_to_user(arg, &cmd, sizeof(cmd))) {
ed9eccbe
DS		 1443 DPRINTK("bad cmd address\n");
1444 ret = -EFAULT;
1445 goto cleanup;
1446 }
476b8477
GKH		 1447cleanup:
1448 kfree(chanlist);
ed9eccbe
DS		 1449
1450 return ret;
1451}
1452
1453/*
1454 COMEDI_LOCK
1455 lock subdevice
1456
1457 arg:
1458 subdevice number
1459
1460 reads:
1461 none
1462
1463 writes:
1464 none
1465
1466*/
1467
0a85b6f0
MT		 1468static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg,
1469 void *file)
ed9eccbe
DS		 1470{
1471 int ret = 0;
1472 unsigned long flags;
34c43922 1473 struct comedi_subdevice *s;
ed9eccbe
DS		 1474
1475 if (arg >= dev->n_subdevices)
1476 return -EINVAL;
b077f2cd 1477 s = &dev->subdevices[arg];
ed9eccbe 1478
5f74ea14 1479 spin_lock_irqsave(&s->spin_lock, flags);
476b8477 1480 if (s->busy || s->lock)
ed9eccbe 1481 ret = -EBUSY;
476b8477 1482 else
ed9eccbe 1483 s->lock = file;
5f74ea14 1484 spin_unlock_irqrestore(&s->spin_lock, flags);
ed9eccbe 1485
c5274ab0 1486#if 0
ed9eccbe
DS		 1487 if (ret < 0)
1488 return ret;
1489
ed9eccbe
DS		 1490 if (s->lock_f)
1491 ret = s->lock_f(dev, s);
1492#endif
1493
1494 return ret;
1495}
1496
1497/*
1498 COMEDI_UNLOCK
1499 unlock subdevice
1500
1501 arg:
1502 subdevice number
1503
1504 reads:
1505 none
1506
1507 writes:
1508 none
1509
1510 This function isn't protected by the semaphore, since
1511 we already own the lock.
1512*/
0a85b6f0
MT		 1513static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg,
1514 void *file)
ed9eccbe 1515{
34c43922 1516 struct comedi_subdevice *s;
ed9eccbe
DS		 1517
1518 if (arg >= dev->n_subdevices)
1519 return -EINVAL;
b077f2cd 1520 s = &dev->subdevices[arg];
ed9eccbe
DS		 1521
1522 if (s->busy)
1523 return -EBUSY;
1524
1525 if (s->lock && s->lock != file)
1526 return -EACCES;
1527
1528 if (s->lock == file) {
1529#if 0
1530 if (s->unlock)
1531 s->unlock(dev, s);
1532#endif
1533
1534 s->lock = NULL;
1535 }
1536
1537 return 0;
1538}
1539
1540/*
1541 COMEDI_CANCEL
1542 cancel acquisition ioctl
1543
1544 arg:
1545 subdevice number
1546
1547 reads:
1548 nothing
1549
1550 writes:
1551 nothing
1552
1553*/
0a85b6f0
MT		 1554static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg,
1555 void *file)
ed9eccbe 1556{
34c43922 1557 struct comedi_subdevice *s;
ed9eccbe
DS		 1558
1559 if (arg >= dev->n_subdevices)
1560 return -EINVAL;
b077f2cd 1561 s = &dev->subdevices[arg];
ed9eccbe
DS		 1562 if (s->async == NULL)
1563 return -EINVAL;
1564
1565 if (s->lock && s->lock != file)
1566 return -EACCES;
1567
1568 if (!s->busy)
1569 return 0;
1570
1571 if (s->busy != file)
1572 return -EBUSY;
1573
1574 return do_cancel(dev, s);
1575}
1576
1577/*
1578 COMEDI_POLL ioctl
1579 instructs driver to synchronize buffers
1580
1581 arg:
1582 subdevice number
1583
1584 reads:
1585 nothing
1586
1587 writes:
1588 nothing
1589
1590*/
0a85b6f0
MT		 1591static int do_poll_ioctl(struct comedi_device *dev, unsigned int arg,
1592 void *file)
ed9eccbe 1593{
34c43922 1594 struct comedi_subdevice *s;
ed9eccbe
DS		 1595
1596 if (arg >= dev->n_subdevices)
1597 return -EINVAL;
b077f2cd 1598 s = &dev->subdevices[arg];
ed9eccbe
DS		 1599
1600 if (s->lock && s->lock != file)
1601 return -EACCES;
1602
1603 if (!s->busy)
1604 return 0;
1605
1606 if (s->busy != file)
1607 return -EBUSY;
1608
1609 if (s->poll)
1610 return s->poll(dev, s);
1611
1612 return -EINVAL;
1613}
1614
47db6d58
HS		 1615static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd,
1616 unsigned long arg)
1617{
6131ffaa 1618 const unsigned minor = iminor(file_inode(file));
17cb3be6 1619 struct comedi_file_info *info = comedi_file_info_from_minor(minor);
ba1bcf6f 1620 struct comedi_device *dev = comedi_dev_from_file_info(info);
47db6d58
HS		 1621 int rc;
1622
4da5fa9a 1623 if (!dev)
47db6d58 1624 return -ENODEV;
47db6d58
HS		 1625
1626 mutex_lock(&dev->mutex);
1627
1628 /* Device config is special, because it must work on
1629 * an unconfigured device. */
1630 if (cmd == COMEDI_DEVCONFIG) {
754ab5c0
IA		 1631 if (minor >= COMEDI_NUM_BOARD_MINORS) {
1632 /* Device config not appropriate on non-board minors. */
1633 rc = -ENOTTY;
1634 goto done;
1635 }
47db6d58
HS		 1636 rc = do_devconfig_ioctl(dev,
1637 (struct comedi_devconfig __user *)arg);
7d3135af
IA		 1638 if (rc == 0)
1639 /* Evade comedi_auto_unconfig(). */
17cb3be6 1640 info->hardware_device = NULL;
47db6d58
HS		 1641 goto done;
1642 }
1643
1644 if (!dev->attached) {
1645 DPRINTK("no driver configured on /dev/comedi%i\n", dev->minor);
1646 rc = -ENODEV;
1647 goto done;
1648 }
1649
1650 switch (cmd) {
1651 case COMEDI_BUFCONFIG:
1652 rc = do_bufconfig_ioctl(dev,
1653 (struct comedi_bufconfig __user *)arg);
1654 break;
1655 case COMEDI_DEVINFO:
1656 rc = do_devinfo_ioctl(dev, (struct comedi_devinfo __user *)arg,
1657 file);
1658 break;
1659 case COMEDI_SUBDINFO:
1660 rc = do_subdinfo_ioctl(dev,
1661 (struct comedi_subdinfo __user *)arg,
1662 file);
1663 break;
1664 case COMEDI_CHANINFO:
1665 rc = do_chaninfo_ioctl(dev, (void __user *)arg);
1666 break;
1667 case COMEDI_RANGEINFO:
1668 rc = do_rangeinfo_ioctl(dev, (void __user *)arg);
1669 break;
1670 case COMEDI_BUFINFO:
1671 rc = do_bufinfo_ioctl(dev,
1672 (struct comedi_bufinfo __user *)arg,
1673 file);
1674 break;
1675 case COMEDI_LOCK:
1676 rc = do_lock_ioctl(dev, arg, file);
1677 break;
1678 case COMEDI_UNLOCK:
1679 rc = do_unlock_ioctl(dev, arg, file);
1680 break;
1681 case COMEDI_CANCEL:
1682 rc = do_cancel_ioctl(dev, arg, file);
1683 break;
1684 case COMEDI_CMD:
1685 rc = do_cmd_ioctl(dev, (struct comedi_cmd __user *)arg, file);
1686 break;
1687 case COMEDI_CMDTEST:
1688 rc = do_cmdtest_ioctl(dev, (struct comedi_cmd __user *)arg,
1689 file);
1690 break;
1691 case COMEDI_INSNLIST:
1692 rc = do_insnlist_ioctl(dev,
1693 (struct comedi_insnlist __user *)arg,
1694 file);
1695 break;
1696 case COMEDI_INSN:
1697 rc = do_insn_ioctl(dev, (struct comedi_insn __user *)arg,
1698 file);
1699 break;
1700 case COMEDI_POLL:
1701 rc = do_poll_ioctl(dev, arg, file);
1702 break;
1703 default:
1704 rc = -ENOTTY;
1705 break;
1706 }
1707
1708done:
1709 mutex_unlock(&dev->mutex);
1710 return rc;
1711}
1712
df30b21c
FV		 1713static void comedi_vm_open(struct vm_area_struct *area)
1714{
1715 struct comedi_async *async;
1716 struct comedi_device *dev;
1717
1718 async = area->vm_private_data;
1719 dev = async->subdevice->device;
1720
1721 mutex_lock(&dev->mutex);
1722 async->mmap_count++;
1723 mutex_unlock(&dev->mutex);
1724}
1725
1726static void comedi_vm_close(struct vm_area_struct *area)
ed9eccbe 1727{
d163679c 1728 struct comedi_async *async;
71b5f4f1 1729 struct comedi_device *dev;
ed9eccbe
DS		 1730
1731 async = area->vm_private_data;
1732 dev = async->subdevice->device;
1733
1734 mutex_lock(&dev->mutex);
1735 async->mmap_count--;
1736 mutex_unlock(&dev->mutex);
1737}
1738
1739static struct vm_operations_struct comedi_vm_ops = {
df30b21c
FV		 1740 .open = comedi_vm_open,
1741 .close = comedi_vm_close,
ed9eccbe
DS		 1742};
1743
1744static int comedi_mmap(struct file *file, struct vm_area_struct *vma)
1745{
6131ffaa 1746 const unsigned minor = iminor(file_inode(file));
a52840a9 1747 struct comedi_file_info *info = comedi_file_info_from_minor(minor);
ba1bcf6f 1748 struct comedi_device *dev = comedi_dev_from_file_info(info);
a52840a9
HS		 1749 struct comedi_subdevice *s;
1750 struct comedi_async *async;
ed9eccbe
DS		 1751 unsigned long start = vma->vm_start;
1752 unsigned long size;
1753 int n_pages;
1754 int i;
1755 int retval;
3ffab428 1756
a52840a9 1757 if (!dev)
70fe742c 1758 return -ENODEV;
ed9eccbe
DS		 1759
1760 mutex_lock(&dev->mutex);
a52840a9 1761
ed9eccbe
DS		 1762 if (!dev->attached) {
1763 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1764 retval = -ENODEV;
1765 goto done;
1766 }
a52840a9 1767
476b8477 1768 if (vma->vm_flags & VM_WRITE)
7d8a2567 1769 s = comedi_write_subdevice(info);
476b8477 1770 else
7d8a2567 1771 s = comedi_read_subdevice(info);
a52840a9 1772 if (!s) {
ed9eccbe
DS		 1773 retval = -EINVAL;
1774 goto done;
1775 }
a52840a9 1776
ed9eccbe 1777 async = s->async;
a52840a9 1778 if (!async) {
ed9eccbe
DS		 1779 retval = -EINVAL;
1780 goto done;
1781 }
1782
1783 if (vma->vm_pgoff != 0) {
1784 DPRINTK("comedi: mmap() offset must be 0.\n");
1785 retval = -EINVAL;
1786 goto done;
1787 }
1788
1789 size = vma->vm_end - vma->vm_start;
1790 if (size > async->prealloc_bufsz) {
1791 retval = -EFAULT;
1792 goto done;
1793 }
1794 if (size & (~PAGE_MASK)) {
1795 retval = -EFAULT;
1796 goto done;
1797 }
1798
1799 n_pages = size >> PAGE_SHIFT;
1800 for (i = 0; i < n_pages; ++i) {
a52840a9
HS		 1801 struct comedi_buf_page *buf = &async->buf_page_list[i];
1802
ed9eccbe 1803 if (remap_pfn_range(vma, start,
a52840a9
HS		 1804 page_to_pfn(virt_to_page(buf->virt_addr)),
1805 PAGE_SIZE, PAGE_SHARED)) {
ed9eccbe
DS		 1806 retval = -EAGAIN;
1807 goto done;
1808 }
1809 start += PAGE_SIZE;
1810 }
1811
1812 vma->vm_ops = &comedi_vm_ops;
1813 vma->vm_private_data = async;
1814
1815 async->mmap_count++;
1816
1817 retval = 0;
476b8477 1818done:
ed9eccbe
DS		 1819 mutex_unlock(&dev->mutex);
1820 return retval;
1821}
1822
1ae5062a 1823static unsigned int comedi_poll(struct file *file, poll_table *wait)
ed9eccbe
DS		 1824{
1825 unsigned int mask = 0;
6131ffaa 1826 const unsigned minor = iminor(file_inode(file));
ed69335c 1827 struct comedi_file_info *info = comedi_file_info_from_minor(minor);
ba1bcf6f 1828 struct comedi_device *dev = comedi_dev_from_file_info(info);
ca081b1d 1829 struct comedi_subdevice *s;
3ffab428 1830
ca081b1d 1831 if (!dev)
70fe742c 1832 return -ENODEV;
ed9eccbe
DS		 1833
1834 mutex_lock(&dev->mutex);
ca081b1d 1835
ed9eccbe
DS		 1836 if (!dev->attached) {
1837 DPRINTK("no driver configured on comedi%i\n", dev->minor);
ca081b1d 1838 goto done;
ed9eccbe
DS		 1839 }
1840
ca081b1d 1841 s = comedi_read_subdevice(info);
cc400e18 1842 if (s && s->async) {
ca081b1d 1843 poll_wait(file, &s->async->wait_head, wait);
f0124630 1844 if (!s->busy || !comedi_is_subdevice_running(s) ||
ca081b1d 1845 comedi_buf_read_n_available(s->async) > 0)
ed9eccbe 1846 mask |= POLLIN | POLLRDNORM;
ed9eccbe 1847 }
ca081b1d
HS		 1848
1849 s = comedi_write_subdevice(info);
cc400e18 1850 if (s && s->async) {
ca081b1d
HS		 1851 unsigned int bps = bytes_per_sample(s->async->subdevice);
1852
1853 poll_wait(file, &s->async->wait_head, wait);
1854 comedi_buf_write_alloc(s->async, s->async->prealloc_bufsz);
f0124630 1855 if (!s->busy || !comedi_is_subdevice_running(s) ||
ca081b1d 1856 comedi_buf_write_n_allocated(s->async) >= bps)
ed9eccbe 1857 mask |= POLLOUT | POLLWRNORM;
ed9eccbe
DS		 1858 }
1859
ca081b1d 1860done:
ed9eccbe
DS		 1861 mutex_unlock(&dev->mutex);
1862 return mask;
1863}
1864
92d0127c
GKH		 1865static ssize_t comedi_write(struct file *file, const char __user *buf,
1866 size_t nbytes, loff_t *offset)
ed9eccbe 1867{
34c43922 1868 struct comedi_subdevice *s;
d163679c 1869 struct comedi_async *async;
ed9eccbe
DS		 1870 int n, m, count = 0, retval = 0;
1871 DECLARE_WAITQUEUE(wait, current);
6131ffaa 1872 const unsigned minor = iminor(file_inode(file));
ed69335c 1873 struct comedi_file_info *info = comedi_file_info_from_minor(minor);
ba1bcf6f 1874 struct comedi_device *dev = comedi_dev_from_file_info(info);
3ffab428 1875
2714b019 1876 if (!dev)
70fe742c 1877 return -ENODEV;
ed9eccbe
DS		 1878
1879 if (!dev->attached) {
1880 DPRINTK("no driver configured on comedi%i\n", dev->minor);
2714b019 1881 return -ENODEV;
ed9eccbe
DS		 1882 }
1883
7d8a2567 1884 s = comedi_write_subdevice(info);
cc400e18 1885 if (!s || !s->async)
2714b019
HS		 1886 return -EIO;
1887
ed9eccbe
DS		 1888 async = s->async;
1889
2714b019
HS		 1890 if (!s->busy || !nbytes)
1891 return 0;
1892 if (s->busy != file)
1893 return -EACCES;
1894
ed9eccbe
DS		 1895 add_wait_queue(&async->wait_head, &wait);
1896 while (nbytes > 0 && !retval) {
1897 set_current_state(TASK_INTERRUPTIBLE);
1898
f0124630 1899 if (!comedi_is_subdevice_running(s)) {
d2611540 1900 if (count == 0) {
c098c21a 1901 if (comedi_is_subdevice_in_error(s))
d2611540 1902 retval = -EPIPE;
c098c21a 1903 else
d2611540 1904 retval = 0;
d2611540
IA		 1905 do_become_nonbusy(dev, s);
1906 }
1907 break;
1908 }
1909
ed9eccbe
DS		 1910 n = nbytes;
1911
1912 m = n;
476b8477 1913 if (async->buf_write_ptr + m > async->prealloc_bufsz)
ed9eccbe 1914 m = async->prealloc_bufsz - async->buf_write_ptr;
ed9eccbe 1915 comedi_buf_write_alloc(async, async->prealloc_bufsz);
476b8477 1916 if (m > comedi_buf_write_n_allocated(async))
ed9eccbe 1917 m = comedi_buf_write_n_allocated(async);
ed9eccbe
DS		 1918 if (m < n)
1919 n = m;
1920
1921 if (n == 0) {
ed9eccbe
DS		 1922 if (file->f_flags & O_NONBLOCK) {
1923 retval = -EAGAIN;
1924 break;
1925 }
6a9ce6b6 1926 schedule();
ed9eccbe
DS		 1927 if (signal_pending(current)) {
1928 retval = -ERESTARTSYS;
1929 break;
1930 }
476b8477 1931 if (!s->busy)
ed9eccbe 1932 break;
ed9eccbe
DS		 1933 if (s->busy != file) {
1934 retval = -EACCES;
1935 break;
1936 }
1937 continue;
1938 }
1939
1940 m = copy_from_user(async->prealloc_buf + async->buf_write_ptr,
476b8477 1941 buf, n);
ed9eccbe
DS		 1942 if (m) {
1943 n -= m;
1944 retval = -EFAULT;
1945 }
1946 comedi_buf_write_free(async, n);
1947
1948 count += n;
1949 nbytes -= n;
1950
1951 buf += n;
1952 break; /* makes device work like a pipe */
1953 }
1954 set_current_state(TASK_RUNNING);
1955 remove_wait_queue(&async->wait_head, &wait);
1956
476b8477 1957 return count ? count : retval;
ed9eccbe
DS		 1958}
1959
92d0127c 1960static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes,
6705b68d 1961 loff_t *offset)
ed9eccbe 1962{
34c43922 1963 struct comedi_subdevice *s;
d163679c 1964 struct comedi_async *async;
ed9eccbe
DS		 1965 int n, m, count = 0, retval = 0;
1966 DECLARE_WAITQUEUE(wait, current);
6131ffaa 1967 const unsigned minor = iminor(file_inode(file));
ed69335c 1968 struct comedi_file_info *info = comedi_file_info_from_minor(minor);
ba1bcf6f 1969 struct comedi_device *dev = comedi_dev_from_file_info(info);
3ffab428 1970
5c87fef5 1971 if (!dev)
70fe742c 1972 return -ENODEV;
ed9eccbe
DS		 1973
1974 if (!dev->attached) {
1975 DPRINTK("no driver configured on comedi%i\n", dev->minor);
5c87fef5 1976 return -ENODEV;
ed9eccbe
DS		 1977 }
1978
7d8a2567 1979 s = comedi_read_subdevice(info);
cc400e18 1980 if (!s || !s->async)
5c87fef5
HS		 1981 return -EIO;
1982
ed9eccbe 1983 async = s->async;
5c87fef5
HS		 1984 if (!s->busy || !nbytes)
1985 return 0;
1986 if (s->busy != file)
1987 return -EACCES;
ed9eccbe
DS		 1988
1989 add_wait_queue(&async->wait_head, &wait);
1990 while (nbytes > 0 && !retval) {
1991 set_current_state(TASK_INTERRUPTIBLE);
1992
1993 n = nbytes;
1994
1995 m = comedi_buf_read_n_available(async);
476b8477
GKH		 1996 /* printk("%d available\n",m); */
1997 if (async->buf_read_ptr + m > async->prealloc_bufsz)
ed9eccbe 1998 m = async->prealloc_bufsz - async->buf_read_ptr;
476b8477 1999 /* printk("%d contiguous\n",m); */
ed9eccbe
DS		 2000 if (m < n)
2001 n = m;
2002
2003 if (n == 0) {
f0124630 2004 if (!comedi_is_subdevice_running(s)) {
ed9eccbe 2005 do_become_nonbusy(dev, s);
c098c21a 2006 if (comedi_is_subdevice_in_error(s))
ed9eccbe 2007 retval = -EPIPE;
c098c21a 2008 else
ed9eccbe 2009 retval = 0;
ed9eccbe
DS		 2010 break;
2011 }
2012 if (file->f_flags & O_NONBLOCK) {
2013 retval = -EAGAIN;
2014 break;
2015 }
6a9ce6b6 2016 schedule();
ed9eccbe
DS		 2017 if (signal_pending(current)) {
2018 retval = -ERESTARTSYS;
2019 break;
2020 }
ed9eccbe
DS		 2021 if (!s->busy) {
2022 retval = 0;
2023 break;
2024 }
2025 if (s->busy != file) {
2026 retval = -EACCES;
2027 break;
2028 }
2029 continue;
2030 }
2031 m = copy_to_user(buf, async->prealloc_buf +
476b8477 2032 async->buf_read_ptr, n);
ed9eccbe
DS		 2033 if (m) {
2034 n -= m;
2035 retval = -EFAULT;
2036 }
2037
2038 comedi_buf_read_alloc(async, n);
2039 comedi_buf_read_free(async, n);
2040
2041 count += n;
2042 nbytes -= n;
2043
2044 buf += n;
2045 break; /* makes device work like a pipe */
2046 }
9682e28c 2047 if (comedi_is_subdevice_idle(s) &&
476b8477 2048 async->buf_read_count - async->buf_write_count == 0) {
ed9eccbe
DS		 2049 do_become_nonbusy(dev, s);
2050 }
2051 set_current_state(TASK_RUNNING);
2052 remove_wait_queue(&async->wait_head, &wait);
2053
476b8477 2054 return count ? count : retval;
ed9eccbe
DS		 2055}
2056
ed9eccbe
DS		 2057static int comedi_open(struct inode *inode, struct file *file)
2058{
ed9eccbe 2059 const unsigned minor = iminor(inode);
4da5fa9a 2060 struct comedi_device *dev = comedi_dev_from_minor(minor);
97920071 2061
4da5fa9a 2062 if (!dev) {
ed9eccbe
DS		 2063 DPRINTK("invalid minor number\n");
2064 return -ENODEV;
2065 }
2066
2067 /* This is slightly hacky, but we want module autoloading
2068 * to work for root.
2069 * case: user opens device, attached -> ok
13f12b5a
IA		 2070 * case: user opens device, unattached, !in_request_module -> autoload
2071 * case: user opens device, unattached, in_request_module -> fail
ed9eccbe 2072 * case: root opens device, attached -> ok
13f12b5a 2073 * case: root opens device, unattached, in_request_module -> ok
ed9eccbe 2074 * (typically called from modprobe)
13f12b5a 2075 * case: root opens device, unattached, !in_request_module -> autoload
ed9eccbe
DS		 2076 *
2077 * The last could be changed to "-> ok", which would deny root
2078 * autoloading.
2079 */
2080 mutex_lock(&dev->mutex);
2081 if (dev->attached)
2082 goto ok;
a8f80e8f 2083 if (!capable(CAP_NET_ADMIN) && dev->in_request_module) {
ed9eccbe
DS		 2084 DPRINTK("in request module\n");
2085 mutex_unlock(&dev->mutex);
2086 return -ENODEV;
2087 }
a8f80e8f 2088 if (capable(CAP_NET_ADMIN) && dev->in_request_module)
ed9eccbe
DS		 2089 goto ok;
2090
13f12b5a 2091 dev->in_request_module = true;
ed9eccbe 2092
ed9eccbe
DS		 2093#ifdef CONFIG_KMOD
2094 mutex_unlock(&dev->mutex);
56d92c60 2095 request_module("char-major-%i-%i", COMEDI_MAJOR, dev->minor);
ed9eccbe
DS		 2096 mutex_lock(&dev->mutex);
2097#endif
2098
13f12b5a 2099 dev->in_request_module = false;
ed9eccbe 2100
a8f80e8f
EP		 2101 if (!dev->attached && !capable(CAP_NET_ADMIN)) {
2102 DPRINTK("not attached and not CAP_NET_ADMIN\n");
ed9eccbe
DS		 2103 mutex_unlock(&dev->mutex);
2104 return -ENODEV;
2105 }
2106ok:
2107 __module_get(THIS_MODULE);
2108
2109 if (dev->attached) {
2110 if (!try_module_get(dev->driver->module)) {
2111 module_put(THIS_MODULE);
2112 mutex_unlock(&dev->mutex);
2113 return -ENOSYS;
2114 }
2115 }
2116
3c17ba07
IA		 2117 if (dev->attached && dev->use_count == 0 && dev->open) {
2118 int rc = dev->open(dev);
2119 if (rc < 0) {
2120 module_put(dev->driver->module);
2121 module_put(THIS_MODULE);
2122 mutex_unlock(&dev->mutex);
2123 return rc;
2124 }
2125 }
ed9eccbe
DS		 2126
2127 dev->use_count++;
2128
a5011a26 2129 mutex_unlock(&dev->mutex);
ed9eccbe 2130
a5011a26 2131 return 0;
ed9eccbe
DS		 2132}
2133
2aae0076
HS		 2134static int comedi_fasync(int fd, struct file *file, int on)
2135{
6131ffaa 2136 const unsigned minor = iminor(file_inode(file));
4da5fa9a 2137 struct comedi_device *dev = comedi_dev_from_minor(minor);
2aae0076 2138
4da5fa9a 2139 if (!dev)
2aae0076
HS		 2140 return -ENODEV;
2141
2142 return fasync_helper(fd, file, on, &dev->async_queue);
2143}
2144
a5011a26 2145static int comedi_close(struct inode *inode, struct file *file)
ed9eccbe 2146{
a5011a26 2147 const unsigned minor = iminor(inode);
4da5fa9a 2148 struct comedi_device *dev = comedi_dev_from_minor(minor);
a5011a26 2149 struct comedi_subdevice *s = NULL;
ed9eccbe
DS		 2150 int i;
2151
4da5fa9a 2152 if (!dev)
a5011a26 2153 return -ENODEV;
ed9eccbe 2154
a5011a26
HS		 2155 mutex_lock(&dev->mutex);
2156
2157 if (dev->subdevices) {
2158 for (i = 0; i < dev->n_subdevices; i++) {
b077f2cd 2159 s = &dev->subdevices[i];
a5011a26
HS		 2160
2161 if (s->busy == file)
2162 do_cancel(dev, s);
2163 if (s->lock == file)
2164 s->lock = NULL;
2165 }
ed9eccbe 2166 }
a5011a26
HS		 2167 if (dev->attached && dev->use_count == 1 && dev->close)
2168 dev->close(dev);
2169
2170 module_put(THIS_MODULE);
2171 if (dev->attached)
2172 module_put(dev->driver->module);
2173
2174 dev->use_count--;
2175
2176 mutex_unlock(&dev->mutex);
2177
2178 if (file->f_flags & FASYNC)
2179 comedi_fasync(-1, file, 0);
ed9eccbe
DS		 2180
2181 return 0;
2182}
2183
8cb8aad7 2184static const struct file_operations comedi_fops = {
a5011a26
HS		 2185 .owner = THIS_MODULE,
2186 .unlocked_ioctl = comedi_unlocked_ioctl,
2187 .compat_ioctl = comedi_compat_ioctl,
2188 .open = comedi_open,
2189 .release = comedi_close,
2190 .read = comedi_read,
2191 .write = comedi_write,
2192 .mmap = comedi_mmap,
2193 .poll = comedi_poll,
2194 .fasync = comedi_fasync,
2195 .llseek = noop_llseek,
2196};
2197
8cb8aad7 2198static struct class *comedi_class;
a5011a26
HS		 2199static struct cdev comedi_cdev;
2200
a5011a26
HS		 2201void comedi_error(const struct comedi_device *dev, const char *s)
2202{
4f870fe6 2203 dev_err(dev->class_dev, "%s: %s\n", dev->driver->driver_name, s);
ed9eccbe 2204}
a5011a26 2205EXPORT_SYMBOL(comedi_error);
883db3d9 2206
a5011a26 2207void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s)
883db3d9 2208{
a5011a26
HS		 2209 struct comedi_async *async = s->async;
2210 unsigned runflags = 0;
2211 unsigned runflags_mask = 0;
883db3d9 2212
a5011a26 2213 /* DPRINTK("comedi_event 0x%x\n",mask); */
883db3d9 2214
f0124630 2215 if (!comedi_is_subdevice_running(s))
a5011a26
HS		 2216 return;
2217
2218 if (s->
2219 async->events & (COMEDI_CB_EOA | COMEDI_CB_ERROR |
2220 COMEDI_CB_OVERFLOW)) {
2221 runflags_mask |= SRF_RUNNING;
883db3d9 2222 }
a5011a26
HS		 2223 /* remember if an error event has occurred, so an error
2224 * can be returned the next time the user does a read() */
2225 if (s->async->events & (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) {
2226 runflags_mask |= SRF_ERROR;
2227 runflags |= SRF_ERROR;
883db3d9 2228 }
a5011a26
HS		 2229 if (runflags_mask) {
2230 /*sets SRF_ERROR and SRF_RUNNING together atomically */
2231 comedi_set_subdevice_runflags(s, runflags_mask, runflags);
883db3d9
FMH		 2232 }
2233
a5011a26
HS		 2234 if (async->cb_mask & s->async->events) {
2235 if (comedi_get_subdevice_runflags(s) & SRF_USER) {
2236 wake_up_interruptible(&async->wait_head);
2237 if (s->subdev_flags & SDF_CMD_READ)
2238 kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
2239 if (s->subdev_flags & SDF_CMD_WRITE)
2240 kill_fasync(&dev->async_queue, SIGIO, POLL_OUT);
2241 } else {
2242 if (async->cb_func)
2243 async->cb_func(s->async->events, async->cb_arg);
2244 }
2245 }
2246 s->async->events = 0;
883db3d9 2247}
a5011a26 2248EXPORT_SYMBOL(comedi_event);
883db3d9 2249
a5011a26
HS		 2250static void comedi_device_init(struct comedi_device *dev)
2251{
a5011a26
HS		 2252 spin_lock_init(&dev->spinlock);
2253 mutex_init(&dev->mutex);
2254 dev->minor = -1;
2255}
883db3d9 2256
a5011a26 2257static void comedi_device_cleanup(struct comedi_device *dev)
883db3d9 2258{
a649a675
IA		 2259 struct module *driver_module = NULL;
2260
a5011a26
HS		 2261 if (dev == NULL)
2262 return;
2263 mutex_lock(&dev->mutex);
a649a675
IA		 2264 if (dev->attached)
2265 driver_module = dev->driver->module;
a5011a26 2266 comedi_device_detach(dev);
a649a675
IA		 2267 while (dev->use_count > 0) {
2268 if (driver_module)
2269 module_put(driver_module);
2270 module_put(THIS_MODULE);
2271 dev->use_count--;
2272 }
a5011a26
HS		 2273 mutex_unlock(&dev->mutex);
2274 mutex_destroy(&dev->mutex);
2275}
2276
2277int comedi_alloc_board_minor(struct device *hardware_device)
2278{
cd6b7636 2279 struct comedi_file_info *info;
a5011a26
HS		 2280 struct device *csdev;
2281 unsigned i;
a5011a26 2282
bc252fd1 2283 info = kzalloc(sizeof(*info), GFP_KERNEL);
a5011a26
HS		 2284 if (info == NULL)
2285 return -ENOMEM;
2286 info->device = kzalloc(sizeof(struct comedi_device), GFP_KERNEL);
2287 if (info->device == NULL) {
2288 kfree(info);
2289 return -ENOMEM;
2290 }
2291 info->hardware_device = hardware_device;
2292 comedi_device_init(info->device);
2293 spin_lock(&comedi_file_info_table_lock);
2294 for (i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i) {
2295 if (comedi_file_info_table[i] == NULL) {
2296 comedi_file_info_table[i] = info;
2297 break;
2298 }
2299 }
2300 spin_unlock(&comedi_file_info_table_lock);
2301 if (i == COMEDI_NUM_BOARD_MINORS) {
2302 comedi_device_cleanup(info->device);
2303 kfree(info->device);
2304 kfree(info);
4f870fe6 2305 pr_err("comedi: error: ran out of minor numbers for board device files.\n");
a5011a26
HS		 2306 return -EBUSY;
2307 }
2308 info->device->minor = i;
2309 csdev = device_create(comedi_class, hardware_device,
2310 MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i", i);
2311 if (!IS_ERR(csdev))
2312 info->device->class_dev = csdev;
2313 dev_set_drvdata(csdev, info);
883db3d9 2314
a5011a26 2315 return i;
883db3d9
FMH		 2316}
2317
24fb134d 2318static struct comedi_file_info *comedi_clear_minor(unsigned minor)
883db3d9 2319{
cd6b7636 2320 struct comedi_file_info *info;
883db3d9 2321
a5011a26
HS		 2322 spin_lock(&comedi_file_info_table_lock);
2323 info = comedi_file_info_table[minor];
2324 comedi_file_info_table[minor] = NULL;
2325 spin_unlock(&comedi_file_info_table_lock);
24fb134d
IA		 2326 return info;
2327}
883db3d9 2328
24fb134d
IA		 2329static void comedi_free_board_file_info(struct comedi_file_info *info)
2330{
a5011a26
HS		 2331 if (info) {
2332 struct comedi_device *dev = info->device;
2333 if (dev) {
2334 if (dev->class_dev) {
2335 device_destroy(comedi_class,
2336 MKDEV(COMEDI_MAJOR, dev->minor));
2337 }
2338 comedi_device_cleanup(dev);
2339 kfree(dev);
2340 }
2341 kfree(info);
883db3d9 2342 }
883db3d9
FMH		 2343}
2344
24fb134d
IA		 2345void comedi_free_board_minor(unsigned minor)
2346{
2347 BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS);
2348 comedi_free_board_file_info(comedi_clear_minor(minor));
2349}
2350
a5011a26 2351int comedi_find_board_minor(struct device *hardware_device)
883db3d9 2352{
a5011a26 2353 int minor;
cd6b7636 2354 struct comedi_file_info *info;
883db3d9 2355
a5011a26
HS		 2356 for (minor = 0; minor < COMEDI_NUM_BOARD_MINORS; minor++) {
2357 spin_lock(&comedi_file_info_table_lock);
2358 info = comedi_file_info_table[minor];
2359 if (info && info->hardware_device == hardware_device) {
2360 spin_unlock(&comedi_file_info_table_lock);
2361 return minor;
2362 }
2363 spin_unlock(&comedi_file_info_table_lock);
883db3d9 2364 }
a5011a26 2365 return -ENODEV;
883db3d9
FMH		 2366}
2367
f65cc544 2368int comedi_alloc_subdevice_minor(struct comedi_subdevice *s)
883db3d9 2369{
f65cc544 2370 struct comedi_device *dev = s->device;
cd6b7636 2371 struct comedi_file_info *info;
a5011a26
HS		 2372 struct device *csdev;
2373 unsigned i;
883db3d9 2374
71cf6d3e
HS		 2375 info = kzalloc(sizeof(*info), GFP_KERNEL);
2376 if (!info)
a5011a26
HS		 2377 return -ENOMEM;
2378 info->device = dev;
10464060
IA		 2379 if (s->subdev_flags & SDF_CMD_READ)
2380 info->read_subdevice = s;
2381 if (s->subdev_flags & SDF_CMD_WRITE)
2382 info->write_subdevice = s;
a5011a26
HS		 2383 spin_lock(&comedi_file_info_table_lock);
2384 for (i = COMEDI_FIRST_SUBDEVICE_MINOR; i < COMEDI_NUM_MINORS; ++i) {
2385 if (comedi_file_info_table[i] == NULL) {
2386 comedi_file_info_table[i] = info;
2387 break;
2388 }
2389 }
2390 spin_unlock(&comedi_file_info_table_lock);
2391 if (i == COMEDI_NUM_MINORS) {
2392 kfree(info);
b12da2e4 2393 pr_err("comedi: error: ran out of minor numbers for subdevice files.\n");
a5011a26
HS		 2394 return -EBUSY;
2395 }
2396 s->minor = i;
2397 csdev = device_create(comedi_class, dev->class_dev,
2398 MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i_subd%i",
90a35c15 2399 dev->minor, s->index);
a5011a26
HS		 2400 if (!IS_ERR(csdev))
2401 s->class_dev = csdev;
2402 dev_set_drvdata(csdev, info);
883db3d9 2403
da718546 2404 return 0;
883db3d9
FMH		 2405}
2406
a5011a26 2407void comedi_free_subdevice_minor(struct comedi_subdevice *s)
883db3d9 2408{
cd6b7636 2409 struct comedi_file_info *info;
883db3d9 2410
a5011a26
HS		 2411 if (s == NULL)
2412 return;
2413 if (s->minor < 0)
2414 return;
883db3d9 2415
a5011a26
HS		 2416 BUG_ON(s->minor >= COMEDI_NUM_MINORS);
2417 BUG_ON(s->minor < COMEDI_FIRST_SUBDEVICE_MINOR);
883db3d9 2418
24fb134d 2419 info = comedi_clear_minor(s->minor);
a5011a26
HS		 2420 if (s->class_dev) {
2421 device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor));
2422 s->class_dev = NULL;
883db3d9 2423 }
a5011a26 2424 kfree(info);
883db3d9 2425}
a5787824 2426
682b9119 2427static void comedi_cleanup_board_minors(void)
76cca89f
HS		 2428{
2429 unsigned i;
2430
682b9119 2431 for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++)
76cca89f
HS		 2432 comedi_free_board_minor(i);
2433}
2434
91fa0b0c
HS		 2435static int __init comedi_init(void)
2436{
2437 int i;
2438 int retval;
2439
2440 pr_info("comedi: version " COMEDI_RELEASE " - http://www.comedi.org\n");
2441
2442 if (comedi_num_legacy_minors < 0 ||
2443 comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) {
2444 pr_err("comedi: error: invalid value for module parameter \"comedi_num_legacy_minors\". Valid values are 0 through %i.\n",
2445 COMEDI_NUM_BOARD_MINORS);
2446 return -EINVAL;
2447 }
2448
91fa0b0c
HS		 2449 retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2450 COMEDI_NUM_MINORS, "comedi");
2451 if (retval)
2452 return -EIO;
2453 cdev_init(&comedi_cdev, &comedi_fops);
2454 comedi_cdev.owner = THIS_MODULE;
2455 kobject_set_name(&comedi_cdev.kobj, "comedi");
2456 if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) {
2457 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2458 COMEDI_NUM_MINORS);
2459 return -EIO;
2460 }
2461 comedi_class = class_create(THIS_MODULE, "comedi");
2462 if (IS_ERR(comedi_class)) {
2463 pr_err("comedi: failed to create class\n");
2464 cdev_del(&comedi_cdev);
2465 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2466 COMEDI_NUM_MINORS);
2467 return PTR_ERR(comedi_class);
2468 }
2469
2470 comedi_class->dev_attrs = comedi_dev_attrs;
2471
2472 /* XXX requires /proc interface */
2473 comedi_proc_init();
2474
2475 /* create devices files for legacy/manual use */
2476 for (i = 0; i < comedi_num_legacy_minors; i++) {
2477 int minor;
2478 minor = comedi_alloc_board_minor(NULL);
2479 if (minor < 0) {
682b9119 2480 comedi_cleanup_board_minors();
91fa0b0c
HS		 2481 cdev_del(&comedi_cdev);
2482 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2483 COMEDI_NUM_MINORS);
2484 return minor;
2485 }
2486 }
2487
2488 return 0;
2489}
2490module_init(comedi_init);
2491
2492static void __exit comedi_cleanup(void)
2493{
2494 int i;
2495
682b9119 2496 comedi_cleanup_board_minors();
91fa0b0c
HS		 2497 for (i = 0; i < COMEDI_NUM_MINORS; ++i)
2498 BUG_ON(comedi_file_info_table[i]);
2499
2500 class_destroy(comedi_class);
2501 cdev_del(&comedi_cdev);
2502 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS);
2503
2504 comedi_proc_cleanup();
2505}
2506module_exit(comedi_cleanup);
2507
a5787824
HS		 2508MODULE_AUTHOR("http://www.comedi.org");
2509MODULE_DESCRIPTION("Comedi core module");
2510MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)