projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...
[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
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);
ed9eccbe
DS		 61module_param(comedi_debug, int, 0644);
62#endif
63
6a9d7a21
IA		 64int comedi_autoconfig = 1;
65module_param(comedi_autoconfig, bool, 0444);
66
92d0127c 67static int comedi_num_legacy_minors;
1dd33ab8
BP		 68module_param(comedi_num_legacy_minors, int, 0444);
69
ed9eccbe 70static DEFINE_SPINLOCK(comedi_file_info_table_lock);
476b8477 71static struct comedi_device_file_info
0a85b6f0 72*comedi_file_info_table[COMEDI_NUM_MINORS];
476b8477 73
0a85b6f0 74static int do_devconfig_ioctl(struct comedi_device *dev,
92d0127c
GKH		 75 struct comedi_devconfig __user *arg);
76static int do_bufconfig_ioctl(struct comedi_device *dev,
77 struct comedi_bufconfig __user *arg);
0a85b6f0 78static int do_devinfo_ioctl(struct comedi_device *dev,
92d0127c
GKH		 79 struct comedi_devinfo __user *arg,
80 struct file *file);
0a85b6f0 81static int do_subdinfo_ioctl(struct comedi_device *dev,
92d0127c 82 struct comedi_subdinfo __user *arg, void *file);
0a85b6f0 83static int do_chaninfo_ioctl(struct comedi_device *dev,
92d0127c
GKH		 84 struct comedi_chaninfo __user *arg);
85static int do_bufinfo_ioctl(struct comedi_device *dev,
86 struct comedi_bufinfo __user *arg);
87static int do_cmd_ioctl(struct comedi_device *dev,
88 struct comedi_cmd __user *arg, void *file);
0a85b6f0
MT		 89static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg,
90 void *file);
91static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg,
92 void *file);
93static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg,
94 void *file);
92d0127c
GKH		 95static int do_cmdtest_ioctl(struct comedi_device *dev,
96 struct comedi_cmd __user *arg, void *file);
97static int do_insnlist_ioctl(struct comedi_device *dev,
98 struct comedi_insnlist __user *arg, void *file);
99static int do_insn_ioctl(struct comedi_device *dev,
100 struct comedi_insn __user *arg, void *file);
0a85b6f0
MT		 101static int do_poll_ioctl(struct comedi_device *dev, unsigned int subd,
102 void *file);
71b5f4f1 103
0a85b6f0
MT		 104extern void do_become_nonbusy(struct comedi_device *dev,
105 struct comedi_subdevice *s);
34c43922 106static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s);
ed9eccbe
DS		 107
108static int comedi_fasync(int fd, struct file *file, int on);
109
71b5f4f1 110static int is_device_busy(struct comedi_device *dev);
883db3d9
FMH		 111static int resize_async_buffer(struct comedi_device *dev,
112 struct comedi_subdevice *s,
113 struct comedi_async *async, unsigned new_size);
114
115/* declarations for sysfs attribute files */
116static struct device_attribute dev_attr_max_read_buffer_kb;
117static struct device_attribute dev_attr_read_buffer_kb;
118static struct device_attribute dev_attr_max_write_buffer_kb;
119static struct device_attribute dev_attr_write_buffer_kb;
ed9eccbe 120
ed9eccbe 121static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd,
476b8477 122 unsigned long arg)
ed9eccbe
DS		 123{
124 const unsigned minor = iminor(file->f_dentry->d_inode);
476b8477
GKH		 125 struct comedi_device_file_info *dev_file_info =
126 comedi_get_device_file_info(minor);
71b5f4f1 127 struct comedi_device *dev;
ed9eccbe
DS		 128 int rc;
129
53b670a7
FMH		 130 if (dev_file_info == NULL || dev_file_info->device == NULL)
131 return -ENODEV;
132 dev = dev_file_info->device;
133
ed9eccbe
DS		 134 mutex_lock(&dev->mutex);
135
136 /* Device config is special, because it must work on
137 * an unconfigured device. */
138 if (cmd == COMEDI_DEVCONFIG) {
92d0127c
GKH		 139 rc = do_devconfig_ioctl(dev,
140 (struct comedi_devconfig __user *)arg);
ed9eccbe
DS		 141 goto done;
142 }
143
144 if (!dev->attached) {
145 DPRINTK("no driver configured on /dev/comedi%i\n", dev->minor);
146 rc = -ENODEV;
147 goto done;
148 }
149
150 switch (cmd) {
151 case COMEDI_BUFCONFIG:
92d0127c
GKH		 152 rc = do_bufconfig_ioctl(dev,
153 (struct comedi_bufconfig __user *)arg);
ed9eccbe
DS		 154 break;
155 case COMEDI_DEVINFO:
92d0127c
GKH		 156 rc = do_devinfo_ioctl(dev, (struct comedi_devinfo __user *)arg,
157 file);
ed9eccbe
DS		 158 break;
159 case COMEDI_SUBDINFO:
92d0127c
GKH		 160 rc = do_subdinfo_ioctl(dev,
161 (struct comedi_subdinfo __user *)arg,
162 file);
ed9eccbe
DS		 163 break;
164 case COMEDI_CHANINFO:
92d0127c 165 rc = do_chaninfo_ioctl(dev, (void __user *)arg);
ed9eccbe
DS		 166 break;
167 case COMEDI_RANGEINFO:
92d0127c 168 rc = do_rangeinfo_ioctl(dev, (void __user *)arg);
ed9eccbe
DS		 169 break;
170 case COMEDI_BUFINFO:
92d0127c
GKH		 171 rc = do_bufinfo_ioctl(dev,
172 (struct comedi_bufinfo __user *)arg);
ed9eccbe
DS		 173 break;
174 case COMEDI_LOCK:
175 rc = do_lock_ioctl(dev, arg, file);
176 break;
177 case COMEDI_UNLOCK:
178 rc = do_unlock_ioctl(dev, arg, file);
179 break;
180 case COMEDI_CANCEL:
181 rc = do_cancel_ioctl(dev, arg, file);
182 break;
183 case COMEDI_CMD:
92d0127c 184 rc = do_cmd_ioctl(dev, (struct comedi_cmd __user *)arg, file);
ed9eccbe
DS		 185 break;
186 case COMEDI_CMDTEST:
92d0127c
GKH		 187 rc = do_cmdtest_ioctl(dev, (struct comedi_cmd __user *)arg,
188 file);
ed9eccbe
DS		 189 break;
190 case COMEDI_INSNLIST:
92d0127c
GKH		 191 rc = do_insnlist_ioctl(dev,
192 (struct comedi_insnlist __user *)arg,
193 file);
ed9eccbe
DS		 194 break;
195 case COMEDI_INSN:
92d0127c
GKH		 196 rc = do_insn_ioctl(dev, (struct comedi_insn __user *)arg,
197 file);
ed9eccbe
DS		 198 break;
199 case COMEDI_POLL:
200 rc = do_poll_ioctl(dev, arg, file);
201 break;
202 default:
203 rc = -ENOTTY;
204 break;
205 }
206
476b8477 207done:
ed9eccbe
DS		 208 mutex_unlock(&dev->mutex);
209 return rc;
210}
211
212/*
213 COMEDI_DEVCONFIG
214 device config ioctl
215
216 arg:
217 pointer to devconfig structure
218
219 reads:
220 devconfig structure at arg
221
222 writes:
223 none
224*/
0a85b6f0 225static int do_devconfig_ioctl(struct comedi_device *dev,
92d0127c 226 struct comedi_devconfig __user *arg)
ed9eccbe 227{
0707bb04 228 struct comedi_devconfig it;
ed9eccbe
DS		 229 int ret;
230 unsigned char *aux_data = NULL;
231 int aux_len;
232
233 if (!capable(CAP_SYS_ADMIN))
234 return -EPERM;
235
236 if (arg == NULL) {
237 if (is_device_busy(dev))
238 return -EBUSY;
476b8477 239 if (dev->attached) {
ed9eccbe
DS		 240 struct module *driver_module = dev->driver->module;
241 comedi_device_detach(dev);
242 module_put(driver_module);
243 }
244 return 0;
245 }
246
0707bb04 247 if (copy_from_user(&it, arg, sizeof(struct comedi_devconfig)))
ed9eccbe
DS		 248 return -EFAULT;
249
250 it.board_name[COMEDI_NAMELEN - 1] = 0;
251
252 if (comedi_aux_data(it.options, 0) &&
476b8477 253 it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) {
ed9eccbe
DS		 254 int bit_shift;
255 aux_len = it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH];
256 if (aux_len < 0)
257 return -EFAULT;
258
259 aux_data = vmalloc(aux_len);
260 if (!aux_data)
261 return -ENOMEM;
262
263 if (copy_from_user(aux_data,
476b8477 264 comedi_aux_data(it.options, 0), aux_len)) {
ed9eccbe
DS		 265 vfree(aux_data);
266 return -EFAULT;
267 }
268 it.options[COMEDI_DEVCONF_AUX_DATA_LO] =
476b8477 269 (unsigned long)aux_data;
ed9eccbe
DS		 270 if (sizeof(void *) > sizeof(int)) {
271 bit_shift = sizeof(int) * 8;
272 it.options[COMEDI_DEVCONF_AUX_DATA_HI] =
476b8477 273 ((unsigned long)aux_data) >> bit_shift;
ed9eccbe
DS		 274 } else
275 it.options[COMEDI_DEVCONF_AUX_DATA_HI] = 0;
276 }
277
278 ret = comedi_device_attach(dev, &it);
476b8477
GKH		 279 if (ret == 0) {
280 if (!try_module_get(dev->driver->module)) {
ed9eccbe
DS		 281 comedi_device_detach(dev);
282 return -ENOSYS;
283 }
284 }
285
286 if (aux_data)
287 vfree(aux_data);
288
289 return ret;
290}
291
292/*
293 COMEDI_BUFCONFIG
294 buffer configuration ioctl
295
296 arg:
297 pointer to bufconfig structure
298
299 reads:
300 bufconfig at arg
301
302 writes:
303 modified bufconfig at arg
304
305*/
92d0127c
GKH		 306static int do_bufconfig_ioctl(struct comedi_device *dev,
307 struct comedi_bufconfig __user *arg)
ed9eccbe 308{
be6aba4a 309 struct comedi_bufconfig bc;
d163679c 310 struct comedi_async *async;
34c43922 311 struct comedi_subdevice *s;
883db3d9 312 int retval = 0;
ed9eccbe 313
be6aba4a 314 if (copy_from_user(&bc, arg, sizeof(struct comedi_bufconfig)))
ed9eccbe
DS		 315 return -EFAULT;
316
317 if (bc.subdevice >= dev->n_subdevices || bc.subdevice < 0)
318 return -EINVAL;
319
320 s = dev->subdevices + bc.subdevice;
321 async = s->async;
322
323 if (!async) {
324 DPRINTK("subdevice does not have async capability\n");
325 bc.size = 0;
326 bc.maximum_size = 0;
327 goto copyback;
328 }
329
330 if (bc.maximum_size) {
331 if (!capable(CAP_SYS_ADMIN))
332 return -EPERM;
333
334 async->max_bufsize = bc.maximum_size;
335 }
336
337 if (bc.size) {
883db3d9
FMH		 338 retval = resize_async_buffer(dev, s, async, bc.size);
339 if (retval < 0)
340 return retval;
ed9eccbe
DS		 341 }
342
343 bc.size = async->prealloc_bufsz;
344 bc.maximum_size = async->max_bufsize;
345
476b8477 346copyback:
be6aba4a 347 if (copy_to_user(arg, &bc, sizeof(struct comedi_bufconfig)))
ed9eccbe
DS		 348 return -EFAULT;
349
350 return 0;
351}
352
353/*
354 COMEDI_DEVINFO
355 device info ioctl
356
357 arg:
358 pointer to devinfo structure
359
360 reads:
361 none
362
363 writes:
364 devinfo structure
365
366*/
0a85b6f0 367static int do_devinfo_ioctl(struct comedi_device *dev,
92d0127c
GKH		 368 struct comedi_devinfo __user *arg,
369 struct file *file)
ed9eccbe 370{
063db04b 371 struct comedi_devinfo devinfo;
ed9eccbe 372 const unsigned minor = iminor(file->f_dentry->d_inode);
476b8477
GKH		 373 struct comedi_device_file_info *dev_file_info =
374 comedi_get_device_file_info(minor);
34c43922 375 struct comedi_subdevice *read_subdev =
476b8477 376 comedi_get_read_subdevice(dev_file_info);
34c43922 377 struct comedi_subdevice *write_subdev =
476b8477 378 comedi_get_write_subdevice(dev_file_info);
ed9eccbe
DS		 379
380 memset(&devinfo, 0, sizeof(devinfo));
381
382 /* fill devinfo structure */
383 devinfo.version_code = COMEDI_VERSION_CODE;
384 devinfo.n_subdevs = dev->n_subdevices;
385 memcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN);
386 memcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN);
387
476b8477 388 if (read_subdev)
ed9eccbe 389 devinfo.read_subdevice = read_subdev - dev->subdevices;
476b8477 390 else
ed9eccbe 391 devinfo.read_subdevice = -1;
476b8477
GKH		 392
393 if (write_subdev)
ed9eccbe 394 devinfo.write_subdevice = write_subdev - dev->subdevices;
476b8477 395 else
ed9eccbe 396 devinfo.write_subdevice = -1;
ed9eccbe 397
063db04b 398 if (copy_to_user(arg, &devinfo, sizeof(struct comedi_devinfo)))
ed9eccbe
DS		 399 return -EFAULT;
400
401 return 0;
402}
403
404/*
405 COMEDI_SUBDINFO
406 subdevice info ioctl
407
408 arg:
409 pointer to array of subdevice info structures
410
411 reads:
412 none
413
414 writes:
415 array of subdevice info structures at arg
416
417*/
0a85b6f0 418static int do_subdinfo_ioctl(struct comedi_device *dev,
92d0127c 419 struct comedi_subdinfo __user *arg, void *file)
ed9eccbe
DS		 420{
421 int ret, i;
bd52efbb 422 struct comedi_subdinfo *tmp, *us;
34c43922 423 struct comedi_subdevice *s;
ed9eccbe 424
0a85b6f0
MT		 425 tmp =
426 kcalloc(dev->n_subdevices, sizeof(struct comedi_subdinfo),
427 GFP_KERNEL);
ed9eccbe
DS		 428 if (!tmp)
429 return -ENOMEM;
430
431 /* fill subdinfo structs */
432 for (i = 0; i < dev->n_subdevices; i++) {
433 s = dev->subdevices + i;
434 us = tmp + i;
435
436 us->type = s->type;
437 us->n_chan = s->n_chan;
438 us->subd_flags = s->subdev_flags;
439 if (comedi_get_subdevice_runflags(s) & SRF_RUNNING)
440 us->subd_flags |= SDF_RUNNING;
441#define TIMER_nanosec 5 /* backwards compatibility */
442 us->timer_type = TIMER_nanosec;
443 us->len_chanlist = s->len_chanlist;
444 us->maxdata = s->maxdata;
445 if (s->range_table) {
446 us->range_type =
476b8477 447 (i << 24) | (0 << 16) | (s->range_table->length);
ed9eccbe
DS		 448 } else {
449 us->range_type = 0; /* XXX */
450 }
451 us->flags = s->flags;
452
453 if (s->busy)
454 us->subd_flags |= SDF_BUSY;
455 if (s->busy == file)
456 us->subd_flags |= SDF_BUSY_OWNER;
457 if (s->lock)
458 us->subd_flags |= SDF_LOCKED;
459 if (s->lock == file)
460 us->subd_flags |= SDF_LOCK_OWNER;
461 if (!s->maxdata && s->maxdata_list)
462 us->subd_flags |= SDF_MAXDATA;
463 if (s->flaglist)
464 us->subd_flags |= SDF_FLAGS;
465 if (s->range_table_list)
466 us->subd_flags |= SDF_RANGETYPE;
467 if (s->do_cmd)
468 us->subd_flags |= SDF_CMD;
469
470 if (s->insn_bits != &insn_inval)
471 us->insn_bits_support = COMEDI_SUPPORTED;
472 else
473 us->insn_bits_support = COMEDI_UNSUPPORTED;
474
475 us->settling_time_0 = s->settling_time_0;
476 }
477
478 ret = copy_to_user(arg, tmp,
bd52efbb 479 dev->n_subdevices * sizeof(struct comedi_subdinfo));
ed9eccbe
DS		 480
481 kfree(tmp);
482
483 return ret ? -EFAULT : 0;
484}
485
486/*
487 COMEDI_CHANINFO
488 subdevice info ioctl
489
490 arg:
491 pointer to chaninfo structure
492
493 reads:
494 chaninfo structure at arg
495
496 writes:
497 arrays at elements of chaninfo structure
498
499*/
0a85b6f0 500static int do_chaninfo_ioctl(struct comedi_device *dev,
92d0127c 501 struct comedi_chaninfo __user *arg)
ed9eccbe 502{
34c43922 503 struct comedi_subdevice *s;
a18b416d 504 struct comedi_chaninfo it;
ed9eccbe 505
a18b416d 506 if (copy_from_user(&it, arg, sizeof(struct comedi_chaninfo)))
ed9eccbe
DS		 507 return -EFAULT;
508
509 if (it.subdev >= dev->n_subdevices)
510 return -EINVAL;
511 s = dev->subdevices + it.subdev;
512
513 if (it.maxdata_list) {
514 if (s->maxdata || !s->maxdata_list)
515 return -EINVAL;
516 if (copy_to_user(it.maxdata_list, s->maxdata_list,
790c5541 517 s->n_chan * sizeof(unsigned int)))
ed9eccbe
DS		 518 return -EFAULT;
519 }
520
521 if (it.flaglist) {
522 if (!s->flaglist)
523 return -EINVAL;
524 if (copy_to_user(it.flaglist, s->flaglist,
476b8477 525 s->n_chan * sizeof(unsigned int)))
ed9eccbe
DS		 526 return -EFAULT;
527 }
528
529 if (it.rangelist) {
530 int i;
531
532 if (!s->range_table_list)
533 return -EINVAL;
534 for (i = 0; i < s->n_chan; i++) {
535 int x;
536
537 x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) |
476b8477 538 (s->range_table_list[i]->length);
ed9eccbe
DS		 539 put_user(x, it.rangelist + i);
540 }
476b8477
GKH		 541#if 0
542 if (copy_to_user(it.rangelist, s->range_type_list,
0a85b6f0 543 s->n_chan * sizeof(unsigned int)))
476b8477
GKH		 544 return -EFAULT;
545#endif
ed9eccbe
DS		 546 }
547
548 return 0;
549}
550
551 /*
552 COMEDI_BUFINFO
553 buffer information ioctl
554
555 arg:
556 pointer to bufinfo structure
557
558 reads:
559 bufinfo at arg
560
561 writes:
562 modified bufinfo at arg
563
564 */
92d0127c
GKH		 565static int do_bufinfo_ioctl(struct comedi_device *dev,
566 struct comedi_bufinfo __user *arg)
ed9eccbe 567{
9aa5339a 568 struct comedi_bufinfo bi;
34c43922 569 struct comedi_subdevice *s;
d163679c 570 struct comedi_async *async;
ed9eccbe 571
9aa5339a 572 if (copy_from_user(&bi, arg, sizeof(struct comedi_bufinfo)))
ed9eccbe
DS		 573 return -EFAULT;
574
575 if (bi.subdevice >= dev->n_subdevices || bi.subdevice < 0)
576 return -EINVAL;
577
578 s = dev->subdevices + bi.subdevice;
579 async = s->async;
580
581 if (!async) {
582 DPRINTK("subdevice does not have async capability\n");
583 bi.buf_write_ptr = 0;
584 bi.buf_read_ptr = 0;
585 bi.buf_write_count = 0;
586 bi.buf_read_count = 0;
587 goto copyback;
588 }
589
590 if (bi.bytes_read && (s->subdev_flags & SDF_CMD_READ)) {
591 bi.bytes_read = comedi_buf_read_alloc(async, bi.bytes_read);
592 comedi_buf_read_free(async, bi.bytes_read);
593
594 if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR |
476b8477
GKH		 595 SRF_RUNNING))
596 && async->buf_write_count == async->buf_read_count) {
ed9eccbe
DS		 597 do_become_nonbusy(dev, s);
598 }
599 }
600
601 if (bi.bytes_written && (s->subdev_flags & SDF_CMD_WRITE)) {
602 bi.bytes_written =
476b8477 603 comedi_buf_write_alloc(async, bi.bytes_written);
ed9eccbe
DS		 604 comedi_buf_write_free(async, bi.bytes_written);
605 }
606
607 bi.buf_write_count = async->buf_write_count;
608 bi.buf_write_ptr = async->buf_write_ptr;
609 bi.buf_read_count = async->buf_read_count;
610 bi.buf_read_ptr = async->buf_read_ptr;
611
476b8477 612copyback:
9aa5339a 613 if (copy_to_user(arg, &bi, sizeof(struct comedi_bufinfo)))
ed9eccbe
DS		 614 return -EFAULT;
615
616 return 0;
617}
618
0a85b6f0
MT		 619static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn,
620 unsigned int *data, void *file);
ed9eccbe 621/*
20617f22
PDP		 622 * COMEDI_INSNLIST
623 * synchronous instructions
ed9eccbe 624 *
20617f22
PDP		 625 * arg:
626 * pointer to sync cmd structure
ed9eccbe 627 *
20617f22
PDP		 628 * reads:
629 * sync cmd struct at arg
630 * instruction list
631 * data (for writes)
ed9eccbe 632 *
20617f22
PDP		 633 * writes:
634 * data (for reads)
ed9eccbe
DS		 635 */
636/* arbitrary limits */
637#define MAX_SAMPLES 256
92d0127c
GKH		 638static int do_insnlist_ioctl(struct comedi_device *dev,
639 struct comedi_insnlist __user *arg, void *file)
ed9eccbe 640{
da613f4f 641 struct comedi_insnlist insnlist;
90035c08 642 struct comedi_insn *insns = NULL;
790c5541 643 unsigned int *data = NULL;
ed9eccbe
DS		 644 int i = 0;
645 int ret = 0;
646
da613f4f 647 if (copy_from_user(&insnlist, arg, sizeof(struct comedi_insnlist)))
ed9eccbe
DS		 648 return -EFAULT;
649
790c5541 650 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL);
ed9eccbe
DS		 651 if (!data) {
652 DPRINTK("kmalloc failed\n");
653 ret = -ENOMEM;
654 goto error;
655 }
656
0a85b6f0
MT		 657 insns =
658 kmalloc(sizeof(struct comedi_insn) * insnlist.n_insns, GFP_KERNEL);
ed9eccbe
DS		 659 if (!insns) {
660 DPRINTK("kmalloc failed\n");
661 ret = -ENOMEM;
662 goto error;
663 }
664
665 if (copy_from_user(insns, insnlist.insns,
90035c08 666 sizeof(struct comedi_insn) * insnlist.n_insns)) {
ed9eccbe
DS		 667 DPRINTK("copy_from_user failed\n");
668 ret = -EFAULT;
669 goto error;
670 }
671
672 for (i = 0; i < insnlist.n_insns; i++) {
673 if (insns[i].n > MAX_SAMPLES) {
674 DPRINTK("number of samples too large\n");
675 ret = -EINVAL;
676 goto error;
677 }
678 if (insns[i].insn & INSN_MASK_WRITE) {
679 if (copy_from_user(data, insns[i].data,
790c5541 680 insns[i].n * sizeof(unsigned int))) {
ed9eccbe
DS		 681 DPRINTK("copy_from_user failed\n");
682 ret = -EFAULT;
683 goto error;
684 }
685 }
686 ret = parse_insn(dev, insns + i, data, file);
687 if (ret < 0)
688 goto error;
689 if (insns[i].insn & INSN_MASK_READ) {
690 if (copy_to_user(insns[i].data, data,
790c5541 691 insns[i].n * sizeof(unsigned int))) {
ed9eccbe
DS		 692 DPRINTK("copy_to_user failed\n");
693 ret = -EFAULT;
694 goto error;
695 }
696 }
697 if (need_resched())
698 schedule();
699 }
700
476b8477
GKH		 701error:
702 kfree(insns);
703 kfree(data);
ed9eccbe
DS		 704
705 if (ret < 0)
706 return ret;
707 return i;
708}
709
0a85b6f0
MT		 710static int check_insn_config_length(struct comedi_insn *insn,
711 unsigned int *data)
ed9eccbe 712{
476b8477
GKH		 713 if (insn->n < 1)
714 return -EINVAL;
ed9eccbe
DS		 715
716 switch (data[0]) {
717 case INSN_CONFIG_DIO_OUTPUT:
718 case INSN_CONFIG_DIO_INPUT:
719 case INSN_CONFIG_DISARM:
720 case INSN_CONFIG_RESET:
721 if (insn->n == 1)
722 return 0;
723 break;
724 case INSN_CONFIG_ARM:
725 case INSN_CONFIG_DIO_QUERY:
726 case INSN_CONFIG_BLOCK_SIZE:
727 case INSN_CONFIG_FILTER:
728 case INSN_CONFIG_SERIAL_CLOCK:
729 case INSN_CONFIG_BIDIRECTIONAL_DATA:
730 case INSN_CONFIG_ALT_SOURCE:
731 case INSN_CONFIG_SET_COUNTER_MODE:
732 case INSN_CONFIG_8254_READ_STATUS:
733 case INSN_CONFIG_SET_ROUTING:
734 case INSN_CONFIG_GET_ROUTING:
735 case INSN_CONFIG_GET_PWM_STATUS:
736 case INSN_CONFIG_PWM_SET_PERIOD:
737 case INSN_CONFIG_PWM_GET_PERIOD:
738 if (insn->n == 2)
739 return 0;
740 break;
741 case INSN_CONFIG_SET_GATE_SRC:
742 case INSN_CONFIG_GET_GATE_SRC:
743 case INSN_CONFIG_SET_CLOCK_SRC:
744 case INSN_CONFIG_GET_CLOCK_SRC:
745 case INSN_CONFIG_SET_OTHER_SRC:
746 case INSN_CONFIG_GET_COUNTER_STATUS:
747 case INSN_CONFIG_PWM_SET_H_BRIDGE:
748 case INSN_CONFIG_PWM_GET_H_BRIDGE:
749 case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE:
750 if (insn->n == 3)
751 return 0;
752 break;
753 case INSN_CONFIG_PWM_OUTPUT:
754 case INSN_CONFIG_ANALOG_TRIG:
755 if (insn->n == 5)
756 return 0;
757 break;
0a85b6f0
MT		 758 /* by default we allow the insn since we don't have checks for
759 * all possible cases yet */
ed9eccbe 760 default:
3fffdf20
MR		 761 printk(KERN_WARNING
762 "comedi: no check for data length of config insn id "
0a85b6f0
MT		 763 "%i is implemented.\n"
764 " Add a check to %s in %s.\n"
765 " Assuming n=%i is correct.\n", data[0], __func__,
766 __FILE__, insn->n);
ed9eccbe
DS		 767 return 0;
768 break;
769 }
770 return -EINVAL;
771}
772
0a85b6f0
MT		 773static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn,
774 unsigned int *data, void *file)
ed9eccbe 775{
34c43922 776 struct comedi_subdevice *s;
ed9eccbe
DS		 777 int ret = 0;
778 int i;
779
780 if (insn->insn & INSN_MASK_SPECIAL) {
781 /* a non-subdevice instruction */
782
783 switch (insn->insn) {
784 case INSN_GTOD:
785 {
786 struct timeval tv;
787
788 if (insn->n != 2) {
789 ret = -EINVAL;
790 break;
791 }
792
793 do_gettimeofday(&tv);
794 data[0] = tv.tv_sec;
795 data[1] = tv.tv_usec;
796 ret = 2;
797
798 break;
799 }
800 case INSN_WAIT:
801 if (insn->n != 1 || data[0] >= 100000) {
802 ret = -EINVAL;
803 break;
804 }
805 udelay(data[0] / 1000);
806 ret = 1;
807 break;
808 case INSN_INTTRIG:
809 if (insn->n != 1) {
810 ret = -EINVAL;
811 break;
812 }
813 if (insn->subdev >= dev->n_subdevices) {
814 DPRINTK("%d not usable subdevice\n",
815 insn->subdev);
816 ret = -EINVAL;
817 break;
818 }
819 s = dev->subdevices + insn->subdev;
820 if (!s->async) {
821 DPRINTK("no async\n");
822 ret = -EINVAL;
823 break;
824 }
825 if (!s->async->inttrig) {
826 DPRINTK("no inttrig\n");
827 ret = -EAGAIN;
828 break;
829 }
830 ret = s->async->inttrig(dev, s, insn->data[0]);
831 if (ret >= 0)
832 ret = 1;
833 break;
834 default:
835 DPRINTK("invalid insn\n");
836 ret = -EINVAL;
837 break;
838 }
839 } else {
840 /* a subdevice instruction */
790c5541 841 unsigned int maxdata;
ed9eccbe
DS		 842
843 if (insn->subdev >= dev->n_subdevices) {
844 DPRINTK("subdevice %d out of range\n", insn->subdev);
845 ret = -EINVAL;
846 goto out;
847 }
848 s = dev->subdevices + insn->subdev;
849
850 if (s->type == COMEDI_SUBD_UNUSED) {
851 DPRINTK("%d not usable subdevice\n", insn->subdev);
852 ret = -EIO;
853 goto out;
854 }
855
856 /* are we locked? (ioctl lock) */
857 if (s->lock && s->lock != file) {
858 DPRINTK("device locked\n");
859 ret = -EACCES;
860 goto out;
861 }
862
0fd0ca75 863 ret = comedi_check_chanlist(s, 1, &insn->chanspec);
476b8477 864 if (ret < 0) {
ed9eccbe
DS		 865 ret = -EINVAL;
866 DPRINTK("bad chanspec\n");
867 goto out;
868 }
869
870 if (s->busy) {
871 ret = -EBUSY;
872 goto out;
873 }
874 /* This looks arbitrary. It is. */
875 s->busy = &parse_insn;
876 switch (insn->insn) {
877 case INSN_READ:
878 ret = s->insn_read(dev, s, insn, data);
879 break;
880 case INSN_WRITE:
881 maxdata = s->maxdata_list
476b8477
GKH		 882 ? s->maxdata_list[CR_CHAN(insn->chanspec)]
883 : s->maxdata;
ed9eccbe
DS		 884 for (i = 0; i < insn->n; ++i) {
885 if (data[i] > maxdata) {
886 ret = -EINVAL;
887 DPRINTK("bad data value(s)\n");
888 break;
889 }
890 }
891 if (ret == 0)
892 ret = s->insn_write(dev, s, insn, data);
893 break;
894 case INSN_BITS:
895 if (insn->n != 2) {
896 ret = -EINVAL;
897 break;
898 }
899 ret = s->insn_bits(dev, s, insn, data);
900 break;
901 case INSN_CONFIG:
902 ret = check_insn_config_length(insn, data);
903 if (ret)
904 break;
905 ret = s->insn_config(dev, s, insn, data);
906 break;
907 default:
908 ret = -EINVAL;
909 break;
910 }
911
912 s->busy = NULL;
913 }
914
476b8477 915out:
ed9eccbe
DS		 916 return ret;
917}
918
919/*
20617f22
PDP		 920 * COMEDI_INSN
921 * synchronous instructions
ed9eccbe 922 *
20617f22
PDP		 923 * arg:
924 * pointer to insn
ed9eccbe 925 *
20617f22
PDP		 926 * reads:
927 * struct comedi_insn struct at arg
928 * data (for writes)
ed9eccbe 929 *
20617f22
PDP		 930 * writes:
931 * data (for reads)
ed9eccbe 932 */
92d0127c
GKH		 933static int do_insn_ioctl(struct comedi_device *dev,
934 struct comedi_insn __user *arg, void *file)
ed9eccbe 935{
90035c08 936 struct comedi_insn insn;
790c5541 937 unsigned int *data = NULL;
ed9eccbe
DS		 938 int ret = 0;
939
790c5541 940 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL);
ed9eccbe
DS		 941 if (!data) {
942 ret = -ENOMEM;
943 goto error;
944 }
945
90035c08 946 if (copy_from_user(&insn, arg, sizeof(struct comedi_insn))) {
ed9eccbe
DS		 947 ret = -EFAULT;
948 goto error;
949 }
950
951 /* This is where the behavior of insn and insnlist deviate. */
952 if (insn.n > MAX_SAMPLES)
953 insn.n = MAX_SAMPLES;
954 if (insn.insn & INSN_MASK_WRITE) {
21fe2eea
M		 955 if (copy_from_user(data,
956 insn.data,
957 insn.n * sizeof(unsigned int))) {
ed9eccbe
DS		 958 ret = -EFAULT;
959 goto error;
960 }
961 }
962 ret = parse_insn(dev, &insn, data, file);
963 if (ret < 0)
964 goto error;
965 if (insn.insn & INSN_MASK_READ) {
21fe2eea
M		 966 if (copy_to_user(insn.data,
967 data,
968 insn.n * sizeof(unsigned int))) {
ed9eccbe
DS		 969 ret = -EFAULT;
970 goto error;
971 }
972 }
973 ret = insn.n;
974
476b8477
GKH		 975error:
976 kfree(data);
ed9eccbe
DS		 977
978 return ret;
979}
980
181bd67b
GKH		 981static void comedi_set_subdevice_runflags(struct comedi_subdevice *s,
982 unsigned mask, unsigned bits)
983{
984 unsigned long flags;
985
986 spin_lock_irqsave(&s->spin_lock, flags);
987 s->runflags &= ~mask;
988 s->runflags |= (bits & mask);
989 spin_unlock_irqrestore(&s->spin_lock, flags);
990}
991
92d0127c
GKH		 992static int do_cmd_ioctl(struct comedi_device *dev,
993 struct comedi_cmd __user *cmd, void *file)
ed9eccbe 994{
ea6d0d4c 995 struct comedi_cmd user_cmd;
34c43922 996 struct comedi_subdevice *s;
d163679c 997 struct comedi_async *async;
ed9eccbe 998 int ret = 0;
92d0127c 999 unsigned int __user *chanlist_saver = NULL;
ed9eccbe 1000
92d0127c 1001 if (copy_from_user(&user_cmd, cmd, sizeof(struct comedi_cmd))) {
ed9eccbe
DS		 1002 DPRINTK("bad cmd address\n");
1003 return -EFAULT;
1004 }
476b8477 1005 /* save user's chanlist pointer so it can be restored later */
ed9eccbe
DS		 1006 chanlist_saver = user_cmd.chanlist;
1007
1008 if (user_cmd.subdev >= dev->n_subdevices) {
1009 DPRINTK("%d no such subdevice\n", user_cmd.subdev);
1010 return -ENODEV;
1011 }
1012
1013 s = dev->subdevices + user_cmd.subdev;
1014 async = s->async;
1015
1016 if (s->type == COMEDI_SUBD_UNUSED) {
1017 DPRINTK("%d not valid subdevice\n", user_cmd.subdev);
1018 return -EIO;
1019 }
1020
1021 if (!s->do_cmd || !s->do_cmdtest || !s->async) {
1022 DPRINTK("subdevice %i does not support commands\n",
1023 user_cmd.subdev);
1024 return -EIO;
1025 }
1026
1027 /* are we locked? (ioctl lock) */
1028 if (s->lock && s->lock != file) {
1029 DPRINTK("subdevice locked\n");
1030 return -EACCES;
1031 }
1032
1033 /* are we busy? */
1034 if (s->busy) {
1035 DPRINTK("subdevice busy\n");
1036 return -EBUSY;
1037 }
1038 s->busy = file;
1039
1040 /* make sure channel/gain list isn't too long */
1041 if (user_cmd.chanlist_len > s->len_chanlist) {
1042 DPRINTK("channel/gain list too long %u > %d\n",
1043 user_cmd.chanlist_len, s->len_chanlist);
1044 ret = -EINVAL;
1045 goto cleanup;
1046 }
1047
1048 /* make sure channel/gain list isn't too short */
1049 if (user_cmd.chanlist_len < 1) {
1050 DPRINTK("channel/gain list too short %u < 1\n",
1051 user_cmd.chanlist_len);
1052 ret = -EINVAL;
1053 goto cleanup;
1054 }
1055
476b8477 1056 kfree(async->cmd.chanlist);
ed9eccbe
DS		 1057 async->cmd = user_cmd;
1058 async->cmd.data = NULL;
1059 /* load channel/gain list */
1060 async->cmd.chanlist =
476b8477 1061 kmalloc(async->cmd.chanlist_len * sizeof(int), GFP_KERNEL);
ed9eccbe
DS		 1062 if (!async->cmd.chanlist) {
1063 DPRINTK("allocation failed\n");
1064 ret = -ENOMEM;
1065 goto cleanup;
1066 }
1067
1068 if (copy_from_user(async->cmd.chanlist, user_cmd.chanlist,
476b8477 1069 async->cmd.chanlist_len * sizeof(int))) {
ed9eccbe
DS		 1070 DPRINTK("fault reading chanlist\n");
1071 ret = -EFAULT;
1072 goto cleanup;
1073 }
1074
1075 /* make sure each element in channel/gain list is valid */
21fe2eea
M		 1076 ret = comedi_check_chanlist(s,
1077 async->cmd.chanlist_len,
1078 async->cmd.chanlist);
476b8477 1079 if (ret < 0) {
ed9eccbe
DS		 1080 DPRINTK("bad chanlist\n");
1081 goto cleanup;
1082 }
1083
1084 ret = s->do_cmdtest(dev, s, &async->cmd);
1085
1086 if (async->cmd.flags & TRIG_BOGUS || ret) {
1087 DPRINTK("test returned %d\n", ret);
1088 user_cmd = async->cmd;
476b8477 1089 /* restore chanlist pointer before copying back */
ed9eccbe
DS		 1090 user_cmd.chanlist = chanlist_saver;
1091 user_cmd.data = NULL;
92d0127c 1092 if (copy_to_user(cmd, &user_cmd, sizeof(struct comedi_cmd))) {
ed9eccbe
DS		 1093 DPRINTK("fault writing cmd\n");
1094 ret = -EFAULT;
1095 goto cleanup;
1096 }
1097 ret = -EAGAIN;
1098 goto cleanup;
1099 }
1100
1101 if (!async->prealloc_bufsz) {
1102 ret = -ENOMEM;
1103 DPRINTK("no buffer (?)\n");
1104 goto cleanup;
1105 }
1106
1107 comedi_reset_async_buf(async);
1108
1109 async->cb_mask =
476b8477
GKH		 1110 COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR |
1111 COMEDI_CB_OVERFLOW;
1112 if (async->cmd.flags & TRIG_WAKE_EOS)
ed9eccbe 1113 async->cb_mask |= COMEDI_CB_EOS;
ed9eccbe
DS		 1114
1115 comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING);
1116
ed9eccbe
DS		 1117 ret = s->do_cmd(dev, s);
1118 if (ret == 0)
1119 return 0;
1120
476b8477 1121cleanup:
ed9eccbe
DS		 1122 do_become_nonbusy(dev, s);
1123
1124 return ret;
1125}
1126
1127/*
1128 COMEDI_CMDTEST
1129 command testing ioctl
1130
1131 arg:
1132 pointer to cmd structure
1133
1134 reads:
1135 cmd structure at arg
1136 channel/range list
1137
1138 writes:
1139 modified cmd structure at arg
1140
1141*/
92d0127c
GKH		 1142static int do_cmdtest_ioctl(struct comedi_device *dev,
1143 struct comedi_cmd __user *arg, void *file)
ed9eccbe 1144{
ea6d0d4c 1145 struct comedi_cmd user_cmd;
34c43922 1146 struct comedi_subdevice *s;
ed9eccbe
DS		 1147 int ret = 0;
1148 unsigned int *chanlist = NULL;
92d0127c 1149 unsigned int __user *chanlist_saver = NULL;
ed9eccbe 1150
ea6d0d4c 1151 if (copy_from_user(&user_cmd, arg, sizeof(struct comedi_cmd))) {
ed9eccbe
DS		 1152 DPRINTK("bad cmd address\n");
1153 return -EFAULT;
1154 }
476b8477 1155 /* save user's chanlist pointer so it can be restored later */
ed9eccbe
DS		 1156 chanlist_saver = user_cmd.chanlist;
1157
1158 if (user_cmd.subdev >= dev->n_subdevices) {
1159 DPRINTK("%d no such subdevice\n", user_cmd.subdev);
1160 return -ENODEV;
1161 }
1162
1163 s = dev->subdevices + user_cmd.subdev;
1164 if (s->type == COMEDI_SUBD_UNUSED) {
1165 DPRINTK("%d not valid subdevice\n", user_cmd.subdev);
1166 return -EIO;
1167 }
1168
1169 if (!s->do_cmd || !s->do_cmdtest) {
1170 DPRINTK("subdevice %i does not support commands\n",
1171 user_cmd.subdev);
1172 return -EIO;
1173 }
1174
1175 /* make sure channel/gain list isn't too long */
1176 if (user_cmd.chanlist_len > s->len_chanlist) {
1177 DPRINTK("channel/gain list too long %d > %d\n",
1178 user_cmd.chanlist_len, s->len_chanlist);
1179 ret = -EINVAL;
1180 goto cleanup;
1181 }
1182
1183 /* load channel/gain list */
1184 if (user_cmd.chanlist) {
1185 chanlist =
476b8477 1186 kmalloc(user_cmd.chanlist_len * sizeof(int), GFP_KERNEL);
ed9eccbe
DS		 1187 if (!chanlist) {
1188 DPRINTK("allocation failed\n");
1189 ret = -ENOMEM;
1190 goto cleanup;
1191 }
1192
1193 if (copy_from_user(chanlist, user_cmd.chanlist,
476b8477 1194 user_cmd.chanlist_len * sizeof(int))) {
ed9eccbe
DS		 1195 DPRINTK("fault reading chanlist\n");
1196 ret = -EFAULT;
1197 goto cleanup;
1198 }
1199
1200 /* make sure each element in channel/gain list is valid */
0fd0ca75 1201 ret = comedi_check_chanlist(s, user_cmd.chanlist_len, chanlist);
476b8477 1202 if (ret < 0) {
ed9eccbe
DS		 1203 DPRINTK("bad chanlist\n");
1204 goto cleanup;
1205 }
1206
1207 user_cmd.chanlist = chanlist;
1208 }
1209
1210 ret = s->do_cmdtest(dev, s, &user_cmd);
1211
476b8477 1212 /* restore chanlist pointer before copying back */
ed9eccbe
DS		 1213 user_cmd.chanlist = chanlist_saver;
1214
ea6d0d4c 1215 if (copy_to_user(arg, &user_cmd, sizeof(struct comedi_cmd))) {
ed9eccbe
DS		 1216 DPRINTK("bad cmd address\n");
1217 ret = -EFAULT;
1218 goto cleanup;
1219 }
476b8477
GKH		 1220cleanup:
1221 kfree(chanlist);
ed9eccbe
DS		 1222
1223 return ret;
1224}
1225
1226/*
1227 COMEDI_LOCK
1228 lock subdevice
1229
1230 arg:
1231 subdevice number
1232
1233 reads:
1234 none
1235
1236 writes:
1237 none
1238
1239*/
1240
0a85b6f0
MT		 1241static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg,
1242 void *file)
ed9eccbe
DS		 1243{
1244 int ret = 0;
1245 unsigned long flags;
34c43922 1246 struct comedi_subdevice *s;
ed9eccbe
DS		 1247
1248 if (arg >= dev->n_subdevices)
1249 return -EINVAL;
1250 s = dev->subdevices + arg;
1251
5f74ea14 1252 spin_lock_irqsave(&s->spin_lock, flags);
476b8477 1253 if (s->busy || s->lock)
ed9eccbe 1254 ret = -EBUSY;
476b8477 1255 else
ed9eccbe 1256 s->lock = file;
5f74ea14 1257 spin_unlock_irqrestore(&s->spin_lock, flags);
ed9eccbe
DS		 1258
1259 if (ret < 0)
1260 return ret;
1261
1262#if 0
1263 if (s->lock_f)
1264 ret = s->lock_f(dev, s);
1265#endif
1266
1267 return ret;
1268}
1269
1270/*
1271 COMEDI_UNLOCK
1272 unlock subdevice
1273
1274 arg:
1275 subdevice number
1276
1277 reads:
1278 none
1279
1280 writes:
1281 none
1282
1283 This function isn't protected by the semaphore, since
1284 we already own the lock.
1285*/
0a85b6f0
MT		 1286static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg,
1287 void *file)
ed9eccbe 1288{
34c43922 1289 struct comedi_subdevice *s;
ed9eccbe
DS		 1290
1291 if (arg >= dev->n_subdevices)
1292 return -EINVAL;
1293 s = dev->subdevices + arg;
1294
1295 if (s->busy)
1296 return -EBUSY;
1297
1298 if (s->lock && s->lock != file)
1299 return -EACCES;
1300
1301 if (s->lock == file) {
1302#if 0
1303 if (s->unlock)
1304 s->unlock(dev, s);
1305#endif
1306
1307 s->lock = NULL;
1308 }
1309
1310 return 0;
1311}
1312
1313/*
1314 COMEDI_CANCEL
1315 cancel acquisition ioctl
1316
1317 arg:
1318 subdevice number
1319
1320 reads:
1321 nothing
1322
1323 writes:
1324 nothing
1325
1326*/
0a85b6f0
MT		 1327static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg,
1328 void *file)
ed9eccbe 1329{
34c43922 1330 struct comedi_subdevice *s;
ed9eccbe
DS		 1331
1332 if (arg >= dev->n_subdevices)
1333 return -EINVAL;
1334 s = dev->subdevices + arg;
1335 if (s->async == NULL)
1336 return -EINVAL;
1337
1338 if (s->lock && s->lock != file)
1339 return -EACCES;
1340
1341 if (!s->busy)
1342 return 0;
1343
1344 if (s->busy != file)
1345 return -EBUSY;
1346
1347 return do_cancel(dev, s);
1348}
1349
1350/*
1351 COMEDI_POLL ioctl
1352 instructs driver to synchronize buffers
1353
1354 arg:
1355 subdevice number
1356
1357 reads:
1358 nothing
1359
1360 writes:
1361 nothing
1362
1363*/
0a85b6f0
MT		 1364static int do_poll_ioctl(struct comedi_device *dev, unsigned int arg,
1365 void *file)
ed9eccbe 1366{
34c43922 1367 struct comedi_subdevice *s;
ed9eccbe
DS		 1368
1369 if (arg >= dev->n_subdevices)
1370 return -EINVAL;
1371 s = dev->subdevices + arg;
1372
1373 if (s->lock && s->lock != file)
1374 return -EACCES;
1375
1376 if (!s->busy)
1377 return 0;
1378
1379 if (s->busy != file)
1380 return -EBUSY;
1381
1382 if (s->poll)
1383 return s->poll(dev, s);
1384
1385 return -EINVAL;
1386}
1387
34c43922 1388static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
ed9eccbe
DS		 1389{
1390 int ret = 0;
1391
1392 if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) && s->cancel)
1393 ret = s->cancel(dev, s);
1394
1395 do_become_nonbusy(dev, s);
1396
1397 return ret;
1398}
1399
92d0127c 1400static void comedi_unmap(struct vm_area_struct *area)
ed9eccbe 1401{
d163679c 1402 struct comedi_async *async;
71b5f4f1 1403 struct comedi_device *dev;
ed9eccbe
DS		 1404
1405 async = area->vm_private_data;
1406 dev = async->subdevice->device;
1407
1408 mutex_lock(&dev->mutex);
1409 async->mmap_count--;
1410 mutex_unlock(&dev->mutex);
1411}
1412
1413static struct vm_operations_struct comedi_vm_ops = {
0a85b6f0 1414 .close = comedi_unmap,
ed9eccbe
DS		 1415};
1416
1417static int comedi_mmap(struct file *file, struct vm_area_struct *vma)
1418{
1419 const unsigned minor = iminor(file->f_dentry->d_inode);
476b8477
GKH		 1420 struct comedi_device_file_info *dev_file_info =
1421 comedi_get_device_file_info(minor);
71b5f4f1 1422 struct comedi_device *dev = dev_file_info->device;
d163679c 1423 struct comedi_async *async = NULL;
ed9eccbe
DS		 1424 unsigned long start = vma->vm_start;
1425 unsigned long size;
1426 int n_pages;
1427 int i;
1428 int retval;
34c43922 1429 struct comedi_subdevice *s;
ed9eccbe
DS		 1430
1431 mutex_lock(&dev->mutex);
1432 if (!dev->attached) {
1433 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1434 retval = -ENODEV;
1435 goto done;
1436 }
476b8477 1437 if (vma->vm_flags & VM_WRITE)
ed9eccbe 1438 s = comedi_get_write_subdevice(dev_file_info);
476b8477 1439 else
ed9eccbe 1440 s = comedi_get_read_subdevice(dev_file_info);
476b8477 1441
ed9eccbe
DS		 1442 if (s == NULL) {
1443 retval = -EINVAL;
1444 goto done;
1445 }
1446 async = s->async;
1447 if (async == NULL) {
1448 retval = -EINVAL;
1449 goto done;
1450 }
1451
1452 if (vma->vm_pgoff != 0) {
1453 DPRINTK("comedi: mmap() offset must be 0.\n");
1454 retval = -EINVAL;
1455 goto done;
1456 }
1457
1458 size = vma->vm_end - vma->vm_start;
1459 if (size > async->prealloc_bufsz) {
1460 retval = -EFAULT;
1461 goto done;
1462 }
1463 if (size & (~PAGE_MASK)) {
1464 retval = -EFAULT;
1465 goto done;
1466 }
1467
1468 n_pages = size >> PAGE_SHIFT;
1469 for (i = 0; i < n_pages; ++i) {
1470 if (remap_pfn_range(vma, start,
0a85b6f0
MT		 1471 page_to_pfn(virt_to_page
1472 (async->buf_page_list
1473 [i].virt_addr)), PAGE_SIZE,
1474 PAGE_SHARED)) {
ed9eccbe
DS		 1475 retval = -EAGAIN;
1476 goto done;
1477 }
1478 start += PAGE_SIZE;
1479 }
1480
1481 vma->vm_ops = &comedi_vm_ops;
1482 vma->vm_private_data = async;
1483
1484 async->mmap_count++;
1485
1486 retval = 0;
476b8477 1487done:
ed9eccbe
DS		 1488 mutex_unlock(&dev->mutex);
1489 return retval;
1490}
1491
0a85b6f0 1492static unsigned int comedi_poll(struct file *file, poll_table * wait)
ed9eccbe
DS		 1493{
1494 unsigned int mask = 0;
1495 const unsigned minor = iminor(file->f_dentry->d_inode);
476b8477
GKH		 1496 struct comedi_device_file_info *dev_file_info =
1497 comedi_get_device_file_info(minor);
71b5f4f1 1498 struct comedi_device *dev = dev_file_info->device;
34c43922
BP		 1499 struct comedi_subdevice *read_subdev;
1500 struct comedi_subdevice *write_subdev;
ed9eccbe
DS		 1501
1502 mutex_lock(&dev->mutex);
1503 if (!dev->attached) {
1504 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1505 mutex_unlock(&dev->mutex);
1506 return 0;
1507 }
1508
1509 mask = 0;
1510 read_subdev = comedi_get_read_subdevice(dev_file_info);
1511 if (read_subdev) {
1512 poll_wait(file, &read_subdev->async->wait_head, wait);
1513 if (!read_subdev->busy
476b8477
GKH		 1514 || comedi_buf_read_n_available(read_subdev->async) > 0
1515 || !(comedi_get_subdevice_runflags(read_subdev) &
1516 SRF_RUNNING)) {
ed9eccbe
DS		 1517 mask |= POLLIN | POLLRDNORM;
1518 }
1519 }
1520 write_subdev = comedi_get_write_subdevice(dev_file_info);
1521 if (write_subdev) {
1522 poll_wait(file, &write_subdev->async->wait_head, wait);
476b8477
GKH		 1523 comedi_buf_write_alloc(write_subdev->async,
1524 write_subdev->async->prealloc_bufsz);
ed9eccbe 1525 if (!write_subdev->busy
476b8477
GKH		 1526 || !(comedi_get_subdevice_runflags(write_subdev) &
1527 SRF_RUNNING)
1528 || comedi_buf_write_n_allocated(write_subdev->async) >=
1529 bytes_per_sample(write_subdev->async->subdevice)) {
ed9eccbe
DS		 1530 mask |= POLLOUT | POLLWRNORM;
1531 }
1532 }
1533
1534 mutex_unlock(&dev->mutex);
1535 return mask;
1536}
1537
92d0127c
GKH		 1538static ssize_t comedi_write(struct file *file, const char __user *buf,
1539 size_t nbytes, loff_t *offset)
ed9eccbe 1540{
34c43922 1541 struct comedi_subdevice *s;
d163679c 1542 struct comedi_async *async;
ed9eccbe
DS		 1543 int n, m, count = 0, retval = 0;
1544 DECLARE_WAITQUEUE(wait, current);
1545 const unsigned minor = iminor(file->f_dentry->d_inode);
476b8477
GKH		 1546 struct comedi_device_file_info *dev_file_info =
1547 comedi_get_device_file_info(minor);
71b5f4f1 1548 struct comedi_device *dev = dev_file_info->device;
ed9eccbe
DS		 1549
1550 if (!dev->attached) {
1551 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1552 retval = -ENODEV;
1553 goto done;
1554 }
1555
1556 s = comedi_get_write_subdevice(dev_file_info);
1557 if (s == NULL) {
1558 retval = -EIO;
1559 goto done;
1560 }
1561 async = s->async;
1562
1563 if (!nbytes) {
1564 retval = 0;
1565 goto done;
1566 }
1567 if (!s->busy) {
1568 retval = 0;
1569 goto done;
1570 }
1571 if (s->busy != file) {
1572 retval = -EACCES;
1573 goto done;
1574 }
1575 add_wait_queue(&async->wait_head, &wait);
1576 while (nbytes > 0 && !retval) {
1577 set_current_state(TASK_INTERRUPTIBLE);
1578
1579 n = nbytes;
1580
1581 m = n;
476b8477 1582 if (async->buf_write_ptr + m > async->prealloc_bufsz)
ed9eccbe 1583 m = async->prealloc_bufsz - async->buf_write_ptr;
ed9eccbe 1584 comedi_buf_write_alloc(async, async->prealloc_bufsz);
476b8477 1585 if (m > comedi_buf_write_n_allocated(async))
ed9eccbe 1586 m = comedi_buf_write_n_allocated(async);
ed9eccbe
DS		 1587 if (m < n)
1588 n = m;
1589
1590 if (n == 0) {
1591 if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) {
1592 if (comedi_get_subdevice_runflags(s) &
476b8477 1593 SRF_ERROR) {
ed9eccbe
DS		 1594 retval = -EPIPE;
1595 } else {
1596 retval = 0;
1597 }
1598 do_become_nonbusy(dev, s);
1599 break;
1600 }
1601 if (file->f_flags & O_NONBLOCK) {
1602 retval = -EAGAIN;
1603 break;
1604 }
1605 if (signal_pending(current)) {
1606 retval = -ERESTARTSYS;
1607 break;
1608 }
1609 schedule();
476b8477 1610 if (!s->busy)
ed9eccbe 1611 break;
ed9eccbe
DS		 1612 if (s->busy != file) {
1613 retval = -EACCES;
1614 break;
1615 }
1616 continue;
1617 }
1618
1619 m = copy_from_user(async->prealloc_buf + async->buf_write_ptr,
476b8477 1620 buf, n);
ed9eccbe
DS		 1621 if (m) {
1622 n -= m;
1623 retval = -EFAULT;
1624 }
1625 comedi_buf_write_free(async, n);
1626
1627 count += n;
1628 nbytes -= n;
1629
1630 buf += n;
1631 break; /* makes device work like a pipe */
1632 }
1633 set_current_state(TASK_RUNNING);
1634 remove_wait_queue(&async->wait_head, &wait);
1635
1636done:
476b8477 1637 return count ? count : retval;
ed9eccbe
DS		 1638}
1639
92d0127c 1640static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes,
6705b68d 1641 loff_t *offset)
ed9eccbe 1642{
34c43922 1643 struct comedi_subdevice *s;
d163679c 1644 struct comedi_async *async;
ed9eccbe
DS		 1645 int n, m, count = 0, retval = 0;
1646 DECLARE_WAITQUEUE(wait, current);
1647 const unsigned minor = iminor(file->f_dentry->d_inode);
476b8477
GKH		 1648 struct comedi_device_file_info *dev_file_info =
1649 comedi_get_device_file_info(minor);
71b5f4f1 1650 struct comedi_device *dev = dev_file_info->device;
ed9eccbe
DS		 1651
1652 if (!dev->attached) {
1653 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1654 retval = -ENODEV;
1655 goto done;
1656 }
1657
1658 s = comedi_get_read_subdevice(dev_file_info);
1659 if (s == NULL) {
1660 retval = -EIO;
1661 goto done;
1662 }
1663 async = s->async;
1664 if (!nbytes) {
1665 retval = 0;
1666 goto done;
1667 }
1668 if (!s->busy) {
1669 retval = 0;
1670 goto done;
1671 }
1672 if (s->busy != file) {
1673 retval = -EACCES;
1674 goto done;
1675 }
1676
1677 add_wait_queue(&async->wait_head, &wait);
1678 while (nbytes > 0 && !retval) {
1679 set_current_state(TASK_INTERRUPTIBLE);
1680
1681 n = nbytes;
1682
1683 m = comedi_buf_read_n_available(async);
476b8477
GKH		 1684 /* printk("%d available\n",m); */
1685 if (async->buf_read_ptr + m > async->prealloc_bufsz)
ed9eccbe 1686 m = async->prealloc_bufsz - async->buf_read_ptr;
476b8477 1687 /* printk("%d contiguous\n",m); */
ed9eccbe
DS		 1688 if (m < n)
1689 n = m;
1690
1691 if (n == 0) {
1692 if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) {
1693 do_become_nonbusy(dev, s);
1694 if (comedi_get_subdevice_runflags(s) &
476b8477 1695 SRF_ERROR) {
ed9eccbe
DS		 1696 retval = -EPIPE;
1697 } else {
1698 retval = 0;
1699 }
1700 break;
1701 }
1702 if (file->f_flags & O_NONBLOCK) {
1703 retval = -EAGAIN;
1704 break;
1705 }
1706 if (signal_pending(current)) {
1707 retval = -ERESTARTSYS;
1708 break;
1709 }
1710 schedule();
1711 if (!s->busy) {
1712 retval = 0;
1713 break;
1714 }
1715 if (s->busy != file) {
1716 retval = -EACCES;
1717 break;
1718 }
1719 continue;
1720 }
1721 m = copy_to_user(buf, async->prealloc_buf +
476b8477 1722 async->buf_read_ptr, n);
ed9eccbe
DS		 1723 if (m) {
1724 n -= m;
1725 retval = -EFAULT;
1726 }
1727
1728 comedi_buf_read_alloc(async, n);
1729 comedi_buf_read_free(async, n);
1730
1731 count += n;
1732 nbytes -= n;
1733
1734 buf += n;
1735 break; /* makes device work like a pipe */
1736 }
1737 if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | SRF_RUNNING)) &&
476b8477 1738 async->buf_read_count - async->buf_write_count == 0) {
ed9eccbe
DS		 1739 do_become_nonbusy(dev, s);
1740 }
1741 set_current_state(TASK_RUNNING);
1742 remove_wait_queue(&async->wait_head, &wait);
1743
1744done:
476b8477 1745 return count ? count : retval;
ed9eccbe
DS		 1746}
1747
1748/*
1749 This function restores a subdevice to an idle state.
1750 */
34c43922 1751void do_become_nonbusy(struct comedi_device *dev, struct comedi_subdevice *s)
ed9eccbe 1752{
d163679c 1753 struct comedi_async *async = s->async;
ed9eccbe
DS		 1754
1755 comedi_set_subdevice_runflags(s, SRF_RUNNING, 0);
ed9eccbe
DS		 1756 if (async) {
1757 comedi_reset_async_buf(async);
1758 async->inttrig = NULL;
1759 } else {
476b8477
GKH		 1760 printk(KERN_ERR
1761 "BUG: (?) do_become_nonbusy called with async=0\n");
ed9eccbe
DS		 1762 }
1763
1764 s->busy = NULL;
1765}
1766
1767static int comedi_open(struct inode *inode, struct file *file)
1768{
ed9eccbe 1769 const unsigned minor = iminor(inode);
476b8477
GKH		 1770 struct comedi_device_file_info *dev_file_info =
1771 comedi_get_device_file_info(minor);
0a85b6f0
MT		 1772 struct comedi_device *dev =
1773 dev_file_info ? dev_file_info->device : NULL;
97920071 1774
ed9eccbe
DS		 1775 if (dev == NULL) {
1776 DPRINTK("invalid minor number\n");
1777 return -ENODEV;
1778 }
1779
1780 /* This is slightly hacky, but we want module autoloading
1781 * to work for root.
1782 * case: user opens device, attached -> ok
1783 * case: user opens device, unattached, in_request_module=0 -> autoload
1784 * case: user opens device, unattached, in_request_module=1 -> fail
1785 * case: root opens device, attached -> ok
1786 * case: root opens device, unattached, in_request_module=1 -> ok
1787 * (typically called from modprobe)
1788 * case: root opens device, unattached, in_request_module=0 -> autoload
1789 *
1790 * The last could be changed to "-> ok", which would deny root
1791 * autoloading.
1792 */
1793 mutex_lock(&dev->mutex);
1794 if (dev->attached)
1795 goto ok;
a8f80e8f 1796 if (!capable(CAP_NET_ADMIN) && dev->in_request_module) {
ed9eccbe
DS		 1797 DPRINTK("in request module\n");
1798 mutex_unlock(&dev->mutex);
1799 return -ENODEV;
1800 }
a8f80e8f 1801 if (capable(CAP_NET_ADMIN) && dev->in_request_module)
ed9eccbe
DS		 1802 goto ok;
1803
1804 dev->in_request_module = 1;
1805
ed9eccbe
DS		 1806#ifdef CONFIG_KMOD
1807 mutex_unlock(&dev->mutex);
56d92c60 1808 request_module("char-major-%i-%i", COMEDI_MAJOR, dev->minor);
ed9eccbe
DS		 1809 mutex_lock(&dev->mutex);
1810#endif
1811
1812 dev->in_request_module = 0;
1813
a8f80e8f
EP		 1814 if (!dev->attached && !capable(CAP_NET_ADMIN)) {
1815 DPRINTK("not attached and not CAP_NET_ADMIN\n");
ed9eccbe
DS		 1816 mutex_unlock(&dev->mutex);
1817 return -ENODEV;
1818 }
1819ok:
1820 __module_get(THIS_MODULE);
1821
1822 if (dev->attached) {
1823 if (!try_module_get(dev->driver->module)) {
1824 module_put(THIS_MODULE);
1825 mutex_unlock(&dev->mutex);
1826 return -ENOSYS;
1827 }
1828 }
1829
476b8477 1830 if (dev->attached && dev->use_count == 0 && dev->open)
ed9eccbe 1831 dev->open(dev);
ed9eccbe
DS		 1832
1833 dev->use_count++;
1834
1835 mutex_unlock(&dev->mutex);
1836
1837 return 0;
1838}
1839
1840static int comedi_close(struct inode *inode, struct file *file)
1841{
1842 const unsigned minor = iminor(inode);
476b8477
GKH		 1843 struct comedi_device_file_info *dev_file_info =
1844 comedi_get_device_file_info(minor);
71b5f4f1 1845 struct comedi_device *dev = dev_file_info->device;
34c43922 1846 struct comedi_subdevice *s = NULL;
ed9eccbe
DS		 1847 int i;
1848
1849 mutex_lock(&dev->mutex);
1850
1851 if (dev->subdevices) {
1852 for (i = 0; i < dev->n_subdevices; i++) {
1853 s = dev->subdevices + i;
1854
476b8477 1855 if (s->busy == file)
ed9eccbe 1856 do_cancel(dev, s);
476b8477 1857 if (s->lock == file)
ed9eccbe 1858 s->lock = NULL;
ed9eccbe
DS		 1859 }
1860 }
476b8477 1861 if (dev->attached && dev->use_count == 1 && dev->close)
ed9eccbe 1862 dev->close(dev);
ed9eccbe
DS		 1863
1864 module_put(THIS_MODULE);
476b8477 1865 if (dev->attached)
ed9eccbe 1866 module_put(dev->driver->module);
ed9eccbe
DS		 1867
1868 dev->use_count--;
1869
1870 mutex_unlock(&dev->mutex);
1871
476b8477 1872 if (file->f_flags & FASYNC)
ed9eccbe 1873 comedi_fasync(-1, file, 0);
ed9eccbe
DS		 1874
1875 return 0;
1876}
1877
1878static int comedi_fasync(int fd, struct file *file, int on)
1879{
1880 const unsigned minor = iminor(file->f_dentry->d_inode);
476b8477
GKH		 1881 struct comedi_device_file_info *dev_file_info =
1882 comedi_get_device_file_info(minor);
1883
71b5f4f1 1884 struct comedi_device *dev = dev_file_info->device;
ed9eccbe
DS		 1885
1886 return fasync_helper(fd, file, on, &dev->async_queue);
1887}
1888
1889const struct file_operations comedi_fops = {
0a85b6f0 1890 .owner = THIS_MODULE,
0a85b6f0 1891 .unlocked_ioctl = comedi_unlocked_ioctl,
0a85b6f0 1892 .compat_ioctl = comedi_compat_ioctl,
0a85b6f0
MT		 1893 .open = comedi_open,
1894 .release = comedi_close,
1895 .read = comedi_read,
1896 .write = comedi_write,
1897 .mmap = comedi_mmap,
1898 .poll = comedi_poll,
1899 .fasync = comedi_fasync,
ed9eccbe
DS		 1900};
1901
476b8477 1902struct class *comedi_class;
ed9eccbe
DS		 1903static struct cdev comedi_cdev;
1904
1905static void comedi_cleanup_legacy_minors(void)
1906{
1907 unsigned i;
476b8477 1908
1dd33ab8 1909 for (i = 0; i < comedi_num_legacy_minors; i++)
ed9eccbe 1910 comedi_free_board_minor(i);
ed9eccbe
DS		 1911}
1912
1913static int __init comedi_init(void)
1914{
1915 int i;
1916 int retval;
1917
476b8477
GKH		 1918 printk(KERN_INFO "comedi: version " COMEDI_RELEASE
1919 " - http://www.comedi.org\n");
ed9eccbe 1920
a3cb729e
FMH		 1921 if (comedi_num_legacy_minors < 0 ||
1922 comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) {
1923 printk(KERN_ERR "comedi: error: invalid value for module "
1924 "parameter \"comedi_num_legacy_minors\". Valid values "
1925 "are 0 through %i.\n", COMEDI_NUM_BOARD_MINORS);
1926 return -EINVAL;
1927 }
1928
1929 /*
1930 * comedi is unusable if both comedi_autoconfig and
1931 * comedi_num_legacy_minors are zero, so we might as well adjust the
1932 * defaults in that case
1933 */
1934 if (comedi_autoconfig == 0 && comedi_num_legacy_minors == 0)
1935 comedi_num_legacy_minors = 16;
1936
476b8477
GKH		 1937 memset(comedi_file_info_table, 0,
1938 sizeof(struct comedi_device_file_info *) * COMEDI_NUM_MINORS);
ed9eccbe
DS		 1939
1940 retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
476b8477 1941 COMEDI_NUM_MINORS, "comedi");
ed9eccbe
DS		 1942 if (retval)
1943 return -EIO;
1944 cdev_init(&comedi_cdev, &comedi_fops);
1945 comedi_cdev.owner = THIS_MODULE;
1946 kobject_set_name(&comedi_cdev.kobj, "comedi");
1947 if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) {
1948 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
476b8477 1949 COMEDI_NUM_MINORS);
ed9eccbe
DS		 1950 return -EIO;
1951 }
1952 comedi_class = class_create(THIS_MODULE, "comedi");
1953 if (IS_ERR(comedi_class)) {
3fffdf20 1954 printk(KERN_ERR "comedi: failed to create class");
ed9eccbe
DS		 1955 cdev_del(&comedi_cdev);
1956 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
476b8477 1957 COMEDI_NUM_MINORS);
ed9eccbe
DS		 1958 return PTR_ERR(comedi_class);
1959 }
1960
1961 /* XXX requires /proc interface */
1962 comedi_proc_init();
1963
476b8477 1964 /* create devices files for legacy/manual use */
1dd33ab8 1965 for (i = 0; i < comedi_num_legacy_minors; i++) {
ed9eccbe
DS		 1966 int minor;
1967 minor = comedi_alloc_board_minor(NULL);
476b8477 1968 if (minor < 0) {
ed9eccbe
DS		 1969 comedi_cleanup_legacy_minors();
1970 cdev_del(&comedi_cdev);
1971 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
476b8477 1972 COMEDI_NUM_MINORS);
ed9eccbe
DS		 1973 return minor;
1974 }
1975 }
1976
ed9eccbe
DS		 1977 return 0;
1978}
1979
1980static void __exit comedi_cleanup(void)
1981{
1982 int i;
1983
1984 comedi_cleanup_legacy_minors();
476b8477 1985 for (i = 0; i < COMEDI_NUM_MINORS; ++i)
ed9eccbe 1986 BUG_ON(comedi_file_info_table[i]);
476b8477 1987
ed9eccbe
DS		 1988 class_destroy(comedi_class);
1989 cdev_del(&comedi_cdev);
1990 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS);
1991
1992 comedi_proc_cleanup();
ed9eccbe
DS		 1993}
1994
1995module_init(comedi_init);
1996module_exit(comedi_cleanup);
1997
71b5f4f1 1998void comedi_error(const struct comedi_device *dev, const char *s)
ed9eccbe 1999{
3fffdf20
MR		 2000 printk(KERN_ERR "comedi%d: %s: %s\n", dev->minor,
2001 dev->driver->driver_name, s);
ed9eccbe 2002}
18736438 2003EXPORT_SYMBOL(comedi_error);
ed9eccbe 2004
34c43922 2005void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s)
ed9eccbe 2006{
d163679c 2007 struct comedi_async *async = s->async;
ed9eccbe
DS		 2008 unsigned runflags = 0;
2009 unsigned runflags_mask = 0;
2010
476b8477 2011 /* DPRINTK("comedi_event 0x%x\n",mask); */
ed9eccbe
DS		 2012
2013 if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) == 0)
2014 return;
2015
0a85b6f0
MT		 2016 if (s->
2017 async->events & (COMEDI_CB_EOA | COMEDI_CB_ERROR |
2018 COMEDI_CB_OVERFLOW)) {
ed9eccbe
DS		 2019 runflags_mask |= SRF_RUNNING;
2020 }
2021 /* remember if an error event has occured, so an error
2022 * can be returned the next time the user does a read() */
2023 if (s->async->events & (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) {
2024 runflags_mask |= SRF_ERROR;
2025 runflags |= SRF_ERROR;
2026 }
2027 if (runflags_mask) {
2028 /*sets SRF_ERROR and SRF_RUNNING together atomically */
2029 comedi_set_subdevice_runflags(s, runflags_mask, runflags);
2030 }
2031
2032 if (async->cb_mask & s->async->events) {
2033 if (comedi_get_subdevice_runflags(s) & SRF_USER) {
fcea1154 2034 wake_up_interruptible(&async->wait_head);
6705b68d 2035 if (s->subdev_flags & SDF_CMD_READ)
0a85b6f0 2036 kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
6705b68d 2037 if (s->subdev_flags & SDF_CMD_WRITE)
0a85b6f0 2038 kill_fasync(&dev->async_queue, SIGIO, POLL_OUT);
ed9eccbe
DS		 2039 } else {
2040 if (async->cb_func)
2041 async->cb_func(s->async->events, async->cb_arg);
ed9eccbe
DS		 2042 }
2043 }
2044 s->async->events = 0;
2045}
18736438 2046EXPORT_SYMBOL(comedi_event);
ed9eccbe 2047
34c43922 2048unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s)
ed9eccbe
DS		 2049{
2050 unsigned long flags;
2051 unsigned runflags;
2052
5f74ea14 2053 spin_lock_irqsave(&s->spin_lock, flags);
ed9eccbe 2054 runflags = s->runflags;
5f74ea14 2055 spin_unlock_irqrestore(&s->spin_lock, flags);
ed9eccbe
DS		 2056 return runflags;
2057}
18736438 2058EXPORT_SYMBOL(comedi_get_subdevice_runflags);
ed9eccbe 2059
71b5f4f1 2060static int is_device_busy(struct comedi_device *dev)
ed9eccbe 2061{
34c43922 2062 struct comedi_subdevice *s;
ed9eccbe
DS		 2063 int i;
2064
2065 if (!dev->attached)
2066 return 0;
2067
2068 for (i = 0; i < dev->n_subdevices; i++) {
2069 s = dev->subdevices + i;
2070 if (s->busy)
2071 return 1;
2072 if (s->async && s->async->mmap_count)
2073 return 1;
2074 }
2075
2076 return 0;
2077}
2078
92d0127c 2079static void comedi_device_init(struct comedi_device *dev)
ed9eccbe 2080{
71b5f4f1 2081 memset(dev, 0, sizeof(struct comedi_device));
ed9eccbe
DS		 2082 spin_lock_init(&dev->spinlock);
2083 mutex_init(&dev->mutex);
2084 dev->minor = -1;
2085}
2086
92d0127c 2087static void comedi_device_cleanup(struct comedi_device *dev)
ed9eccbe 2088{
476b8477
GKH		 2089 if (dev == NULL)
2090 return;
ed9eccbe
DS		 2091 mutex_lock(&dev->mutex);
2092 comedi_device_detach(dev);
2093 mutex_unlock(&dev->mutex);
2094 mutex_destroy(&dev->mutex);
2095}
2096
2097int comedi_alloc_board_minor(struct device *hardware_device)
2098{
2099 unsigned long flags;
2100 struct comedi_device_file_info *info;
0bfbbe8f 2101 struct device *csdev;
ed9eccbe 2102 unsigned i;
883db3d9 2103 int retval;
ed9eccbe
DS		 2104
2105 info = kzalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL);
476b8477
GKH		 2106 if (info == NULL)
2107 return -ENOMEM;
71b5f4f1 2108 info->device = kzalloc(sizeof(struct comedi_device), GFP_KERNEL);
476b8477 2109 if (info->device == NULL) {
ed9eccbe
DS		 2110 kfree(info);
2111 return -ENOMEM;
2112 }
2113 comedi_device_init(info->device);
5f74ea14 2114 spin_lock_irqsave(&comedi_file_info_table_lock, flags);
476b8477
GKH		 2115 for (i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i) {
2116 if (comedi_file_info_table[i] == NULL) {
ed9eccbe
DS		 2117 comedi_file_info_table[i] = info;
2118 break;
2119 }
2120 }
5f74ea14 2121 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags);
476b8477 2122 if (i == COMEDI_NUM_BOARD_MINORS) {
ed9eccbe
DS		 2123 comedi_device_cleanup(info->device);
2124 kfree(info->device);
2125 kfree(info);
0a85b6f0 2126 printk(KERN_ERR
21fe2eea
M		 2127 "comedi: error: "
2128 "ran out of minor numbers for board device files.\n");
ed9eccbe
DS		 2129 return -EBUSY;
2130 }
2131 info->device->minor = i;
2132 csdev = COMEDI_DEVICE_CREATE(comedi_class, NULL,
476b8477
GKH		 2133 MKDEV(COMEDI_MAJOR, i), NULL,
2134 hardware_device, "comedi%i", i);
2135 if (!IS_ERR(csdev))
ed9eccbe 2136 info->device->class_dev = csdev;
883db3d9
FMH		 2137 dev_set_drvdata(csdev, info);
2138 retval = device_create_file(csdev, &dev_attr_max_read_buffer_kb);
2139 if (retval) {
0a85b6f0 2140 printk(KERN_ERR
21fe2eea
M		 2141 "comedi: "
2142 "failed to create sysfs attribute file \"%s\".\n",
0a85b6f0 2143 dev_attr_max_read_buffer_kb.attr.name);
883db3d9
FMH		 2144 comedi_free_board_minor(i);
2145 return retval;
2146 }
2147 retval = device_create_file(csdev, &dev_attr_read_buffer_kb);
2148 if (retval) {
0a85b6f0 2149 printk(KERN_ERR
21fe2eea
M		 2150 "comedi: "
2151 "failed to create sysfs attribute file \"%s\".\n",
0a85b6f0 2152 dev_attr_read_buffer_kb.attr.name);
883db3d9
FMH		 2153 comedi_free_board_minor(i);
2154 return retval;
2155 }
2156 retval = device_create_file(csdev, &dev_attr_max_write_buffer_kb);
2157 if (retval) {
0a85b6f0 2158 printk(KERN_ERR
21fe2eea
M		 2159 "comedi: "
2160 "failed to create sysfs attribute file \"%s\".\n",
0a85b6f0 2161 dev_attr_max_write_buffer_kb.attr.name);
883db3d9
FMH		 2162 comedi_free_board_minor(i);
2163 return retval;
2164 }
2165 retval = device_create_file(csdev, &dev_attr_write_buffer_kb);
2166 if (retval) {
0a85b6f0 2167 printk(KERN_ERR
21fe2eea
M		 2168 "comedi: "
2169 "failed to create sysfs attribute file \"%s\".\n",
0a85b6f0 2170 dev_attr_write_buffer_kb.attr.name);
883db3d9
FMH		 2171 comedi_free_board_minor(i);
2172 return retval;
2173 }
ed9eccbe
DS		 2174 return i;
2175}
2176
2177void comedi_free_board_minor(unsigned minor)
2178{
2179 unsigned long flags;
2180 struct comedi_device_file_info *info;
2181
2182 BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS);
5f74ea14 2183 spin_lock_irqsave(&comedi_file_info_table_lock, flags);
ed9eccbe
DS		 2184 info = comedi_file_info_table[minor];
2185 comedi_file_info_table[minor] = NULL;
5f74ea14 2186 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags);
ed9eccbe 2187
476b8477 2188 if (info) {
71b5f4f1 2189 struct comedi_device *dev = info->device;
476b8477
GKH		 2190 if (dev) {
2191 if (dev->class_dev) {
2192 device_destroy(comedi_class,
2193 MKDEV(COMEDI_MAJOR, dev->minor));
ed9eccbe
DS		 2194 }
2195 comedi_device_cleanup(dev);
2196 kfree(dev);
2197 }
2198 kfree(info);
2199 }
2200}
2201
883db3d9
FMH		 2202int comedi_alloc_subdevice_minor(struct comedi_device *dev,
2203 struct comedi_subdevice *s)
ed9eccbe
DS		 2204{
2205 unsigned long flags;
2206 struct comedi_device_file_info *info;
0bfbbe8f 2207 struct device *csdev;
ed9eccbe 2208 unsigned i;
883db3d9 2209 int retval;
ed9eccbe
DS		 2210
2211 info = kmalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL);
476b8477
GKH		 2212 if (info == NULL)
2213 return -ENOMEM;
ed9eccbe
DS		 2214 info->device = dev;
2215 info->read_subdevice = s;
2216 info->write_subdevice = s;
5f74ea14 2217 spin_lock_irqsave(&comedi_file_info_table_lock, flags);
4c41f3ae 2218 for (i = COMEDI_FIRST_SUBDEVICE_MINOR; i < COMEDI_NUM_MINORS; ++i) {
476b8477 2219 if (comedi_file_info_table[i] == NULL) {
ed9eccbe
DS		 2220 comedi_file_info_table[i] = info;
2221 break;
2222 }
2223 }
5f74ea14 2224 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags);
476b8477 2225 if (i == COMEDI_NUM_MINORS) {
ed9eccbe 2226 kfree(info);
0a85b6f0 2227 printk(KERN_ERR
21fe2eea
M		 2228 "comedi: error: "
2229 "ran out of minor numbers for board device files.\n");
ed9eccbe
DS		 2230 return -EBUSY;
2231 }
2232 s->minor = i;
2233 csdev = COMEDI_DEVICE_CREATE(comedi_class, dev->class_dev,
476b8477
GKH		 2234 MKDEV(COMEDI_MAJOR, i), NULL, NULL,
2235 "comedi%i_subd%i", dev->minor,
2236 (int)(s - dev->subdevices));
2237 if (!IS_ERR(csdev))
ed9eccbe 2238 s->class_dev = csdev;
883db3d9
FMH		 2239 dev_set_drvdata(csdev, info);
2240 retval = device_create_file(csdev, &dev_attr_max_read_buffer_kb);
2241 if (retval) {
0a85b6f0 2242 printk(KERN_ERR
21fe2eea
M		 2243 "comedi: "
2244 "failed to create sysfs attribute file \"%s\".\n",
0a85b6f0 2245 dev_attr_max_read_buffer_kb.attr.name);
883db3d9
FMH		 2246 comedi_free_subdevice_minor(s);
2247 return retval;
2248 }
2249 retval = device_create_file(csdev, &dev_attr_read_buffer_kb);
2250 if (retval) {
0a85b6f0 2251 printk(KERN_ERR
21fe2eea
M		 2252 "comedi: "
2253 "failed to create sysfs attribute file \"%s\".\n",
0a85b6f0 2254 dev_attr_read_buffer_kb.attr.name);
883db3d9
FMH		 2255 comedi_free_subdevice_minor(s);
2256 return retval;
2257 }
2258 retval = device_create_file(csdev, &dev_attr_max_write_buffer_kb);
2259 if (retval) {
0a85b6f0 2260 printk(KERN_ERR
21fe2eea
M		 2261 "comedi: "
2262 "failed to create sysfs attribute file \"%s\".\n",
0a85b6f0 2263 dev_attr_max_write_buffer_kb.attr.name);
883db3d9
FMH		 2264 comedi_free_subdevice_minor(s);
2265 return retval;
2266 }
2267 retval = device_create_file(csdev, &dev_attr_write_buffer_kb);
2268 if (retval) {
0a85b6f0 2269 printk(KERN_ERR
21fe2eea
M		 2270 "comedi: "
2271 "failed to create sysfs attribute file \"%s\".\n",
0a85b6f0 2272 dev_attr_write_buffer_kb.attr.name);
883db3d9
FMH		 2273 comedi_free_subdevice_minor(s);
2274 return retval;
2275 }
ed9eccbe
DS		 2276 return i;
2277}
2278
34c43922 2279void comedi_free_subdevice_minor(struct comedi_subdevice *s)
ed9eccbe
DS		 2280{
2281 unsigned long flags;
2282 struct comedi_device_file_info *info;
2283
476b8477
GKH		 2284 if (s == NULL)
2285 return;
2286 if (s->minor < 0)
2287 return;
ed9eccbe
DS		 2288
2289 BUG_ON(s->minor >= COMEDI_NUM_MINORS);
2290 BUG_ON(s->minor < COMEDI_FIRST_SUBDEVICE_MINOR);
2291
5f74ea14 2292 spin_lock_irqsave(&comedi_file_info_table_lock, flags);
ed9eccbe
DS		 2293 info = comedi_file_info_table[s->minor];
2294 comedi_file_info_table[s->minor] = NULL;
5f74ea14 2295 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags);
ed9eccbe 2296
476b8477 2297 if (s->class_dev) {
ed9eccbe
DS		 2298 device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor));
2299 s->class_dev = NULL;
2300 }
2301 kfree(info);
2302}
2303
2304struct comedi_device_file_info *comedi_get_device_file_info(unsigned minor)
2305{
2306 unsigned long flags;
2307 struct comedi_device_file_info *info;
2308
2309 BUG_ON(minor >= COMEDI_NUM_MINORS);
5f74ea14 2310 spin_lock_irqsave(&comedi_file_info_table_lock, flags);
ed9eccbe 2311 info = comedi_file_info_table[minor];
5f74ea14 2312 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags);
ed9eccbe
DS		 2313 return info;
2314}
18736438 2315EXPORT_SYMBOL_GPL(comedi_get_device_file_info);
883db3d9
FMH		 2316
2317static int resize_async_buffer(struct comedi_device *dev,
2318 struct comedi_subdevice *s,
2319 struct comedi_async *async, unsigned new_size)
2320{
2321 int retval;
2322
2323 if (new_size > async->max_bufsize)
2324 return -EPERM;
2325
2326 if (s->busy) {
2327 DPRINTK("subdevice is busy, cannot resize buffer\n");
2328 return -EBUSY;
2329 }
2330 if (async->mmap_count) {
2331 DPRINTK("subdevice is mmapped, cannot resize buffer\n");
2332 return -EBUSY;
2333 }
2334
2335 if (!async->prealloc_buf)
2336 return -EINVAL;
2337
2338 /* make sure buffer is an integral number of pages
0a85b6f0 2339 * (we round up) */
883db3d9
FMH		 2340 new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK;
2341
2342 retval = comedi_buf_alloc(dev, s, new_size);
2343 if (retval < 0)
2344 return retval;
2345
2346 if (s->buf_change) {
2347 retval = s->buf_change(dev, s, new_size);
2348 if (retval < 0)
2349 return retval;
2350 }
2351
2352 DPRINTK("comedi%i subd %d buffer resized to %i bytes\n",
b8b5cd9f 2353 dev->minor, (int)(s - dev->subdevices), async->prealloc_bufsz);
883db3d9
FMH		 2354 return 0;
2355}
2356
2357/* sysfs attribute files */
2358
2359static const unsigned bytes_per_kibi = 1024;
2360
2361static ssize_t show_max_read_buffer_kb(struct device *dev,
2362 struct device_attribute *attr, char *buf)
2363{
2364 ssize_t retval;
2365 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2366 unsigned max_buffer_size_kb = 0;
2367 struct comedi_subdevice *const read_subdevice =
0a85b6f0 2368 comedi_get_read_subdevice(info);
883db3d9
FMH		 2369
2370 mutex_lock(&info->device->mutex);
2371 if (read_subdevice &&
2372 (read_subdevice->subdev_flags & SDF_CMD_READ) &&
2373 read_subdevice->async) {
2374 max_buffer_size_kb = read_subdevice->async->max_bufsize /
0a85b6f0 2375 bytes_per_kibi;
883db3d9 2376 }
0a85b6f0 2377 retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb);
883db3d9
FMH		 2378 mutex_unlock(&info->device->mutex);
2379
2380 return retval;
2381}
2382
2383static ssize_t store_max_read_buffer_kb(struct device *dev,
2384 struct device_attribute *attr,
2385 const char *buf, size_t count)
2386{
2387 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2388 unsigned long new_max_size_kb;
2389 uint64_t new_max_size;
2390 struct comedi_subdevice *const read_subdevice =
0a85b6f0 2391 comedi_get_read_subdevice(info);
883db3d9
FMH		 2392
2393 if (strict_strtoul(buf, 10, &new_max_size_kb))
2394 return -EINVAL;
0a85b6f0 2395 if (new_max_size_kb != (uint32_t) new_max_size_kb)
883db3d9 2396 return -EINVAL;
0a85b6f0
MT		 2397 new_max_size = ((uint64_t) new_max_size_kb) * bytes_per_kibi;
2398 if (new_max_size != (uint32_t) new_max_size)
883db3d9
FMH		 2399 return -EINVAL;
2400
2401 mutex_lock(&info->device->mutex);
2402 if (read_subdevice == NULL ||
2403 (read_subdevice->subdev_flags & SDF_CMD_READ) == 0 ||
2404 read_subdevice->async == NULL) {
2405 mutex_unlock(&info->device->mutex);
2406 return -EINVAL;
2407 }
2408 read_subdevice->async->max_bufsize = new_max_size;
2409 mutex_unlock(&info->device->mutex);
2410
2411 return count;
2412}
2413
2414static struct device_attribute dev_attr_max_read_buffer_kb = {
2415 .attr = {
0a85b6f0
MT		 2416 .name = "max_read_buffer_kb",
2417 .mode = S_IRUGO | S_IWUSR},
883db3d9
FMH		 2418 .show = &show_max_read_buffer_kb,
2419 .store = &store_max_read_buffer_kb
2420};
2421
2422static ssize_t show_read_buffer_kb(struct device *dev,
2423 struct device_attribute *attr, char *buf)
2424{
2425 ssize_t retval;
2426 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2427 unsigned buffer_size_kb = 0;
2428 struct comedi_subdevice *const read_subdevice =
0a85b6f0 2429 comedi_get_read_subdevice(info);
883db3d9
FMH		 2430
2431 mutex_lock(&info->device->mutex);
2432 if (read_subdevice &&
0a85b6f0
MT		 2433 (read_subdevice->subdev_flags & SDF_CMD_READ) &&
2434 read_subdevice->async) {
883db3d9 2435 buffer_size_kb = read_subdevice->async->prealloc_bufsz /
0a85b6f0 2436 bytes_per_kibi;
883db3d9 2437 }
0a85b6f0 2438 retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb);
883db3d9
FMH		 2439 mutex_unlock(&info->device->mutex);
2440
2441 return retval;
2442}
2443
2444static ssize_t store_read_buffer_kb(struct device *dev,
2445 struct device_attribute *attr,
2446 const char *buf, size_t count)
2447{
2448 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2449 unsigned long new_size_kb;
2450 uint64_t new_size;
2451 int retval;
2452 struct comedi_subdevice *const read_subdevice =
0a85b6f0 2453 comedi_get_read_subdevice(info);
883db3d9
FMH		 2454
2455 if (strict_strtoul(buf, 10, &new_size_kb))
2456 return -EINVAL;
0a85b6f0 2457 if (new_size_kb != (uint32_t) new_size_kb)
883db3d9 2458 return -EINVAL;
0a85b6f0
MT		 2459 new_size = ((uint64_t) new_size_kb) * bytes_per_kibi;
2460 if (new_size != (uint32_t) new_size)
883db3d9
FMH		 2461 return -EINVAL;
2462
2463 mutex_lock(&info->device->mutex);
2464 if (read_subdevice == NULL ||
2465 (read_subdevice->subdev_flags & SDF_CMD_READ) == 0 ||
2466 read_subdevice->async == NULL) {
2467 mutex_unlock(&info->device->mutex);
2468 return -EINVAL;
2469 }
2470 retval = resize_async_buffer(info->device, read_subdevice,
2471 read_subdevice->async, new_size);
2472 mutex_unlock(&info->device->mutex);
2473
2474 if (retval < 0)
2475 return retval;
2476 return count;
2477}
2478
2479static struct device_attribute dev_attr_read_buffer_kb = {
2480 .attr = {
0a85b6f0
MT		 2481 .name = "read_buffer_kb",
2482 .mode = S_IRUGO | S_IWUSR | S_IWGRP},
883db3d9
FMH		 2483 .show = &show_read_buffer_kb,
2484 .store = &store_read_buffer_kb
2485};
2486
2487static ssize_t show_max_write_buffer_kb(struct device *dev,
2488 struct device_attribute *attr,
2489 char *buf)
2490{
2491 ssize_t retval;
2492 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2493 unsigned max_buffer_size_kb = 0;
2494 struct comedi_subdevice *const write_subdevice =
0a85b6f0 2495 comedi_get_write_subdevice(info);
883db3d9
FMH		 2496
2497 mutex_lock(&info->device->mutex);
2498 if (write_subdevice &&
2499 (write_subdevice->subdev_flags & SDF_CMD_WRITE) &&
2500 write_subdevice->async) {
2501 max_buffer_size_kb = write_subdevice->async->max_bufsize /
0a85b6f0 2502 bytes_per_kibi;
883db3d9 2503 }
0a85b6f0 2504 retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb);
883db3d9
FMH		 2505 mutex_unlock(&info->device->mutex);
2506
2507 return retval;
2508}
2509
2510static ssize_t store_max_write_buffer_kb(struct device *dev,
2511 struct device_attribute *attr,
2512 const char *buf, size_t count)
2513{
2514 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2515 unsigned long new_max_size_kb;
2516 uint64_t new_max_size;
2517 struct comedi_subdevice *const write_subdevice =
0a85b6f0 2518 comedi_get_write_subdevice(info);
883db3d9
FMH		 2519
2520 if (strict_strtoul(buf, 10, &new_max_size_kb))
2521 return -EINVAL;
0a85b6f0 2522 if (new_max_size_kb != (uint32_t) new_max_size_kb)
883db3d9 2523 return -EINVAL;
0a85b6f0
MT		 2524 new_max_size = ((uint64_t) new_max_size_kb) * bytes_per_kibi;
2525 if (new_max_size != (uint32_t) new_max_size)
883db3d9
FMH		 2526 return -EINVAL;
2527
2528 mutex_lock(&info->device->mutex);
2529 if (write_subdevice == NULL ||
2530 (write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 ||
2531 write_subdevice->async == NULL) {
2532 mutex_unlock(&info->device->mutex);
2533 return -EINVAL;
2534 }
2535 write_subdevice->async->max_bufsize = new_max_size;
2536 mutex_unlock(&info->device->mutex);
2537
2538 return count;
2539}
2540
2541static struct device_attribute dev_attr_max_write_buffer_kb = {
2542 .attr = {
0a85b6f0
MT		 2543 .name = "max_write_buffer_kb",
2544 .mode = S_IRUGO | S_IWUSR},
883db3d9
FMH		 2545 .show = &show_max_write_buffer_kb,
2546 .store = &store_max_write_buffer_kb
2547};
2548
2549static ssize_t show_write_buffer_kb(struct device *dev,
2550 struct device_attribute *attr, char *buf)
2551{
2552 ssize_t retval;
2553 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2554 unsigned buffer_size_kb = 0;
2555 struct comedi_subdevice *const write_subdevice =
0a85b6f0 2556 comedi_get_write_subdevice(info);
883db3d9
FMH		 2557
2558 mutex_lock(&info->device->mutex);
2559 if (write_subdevice &&
2560 (write_subdevice->subdev_flags & SDF_CMD_WRITE) &&
2561 write_subdevice->async) {
2562 buffer_size_kb = write_subdevice->async->prealloc_bufsz /
0a85b6f0 2563 bytes_per_kibi;
883db3d9 2564 }
0a85b6f0 2565 retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb);
883db3d9
FMH		 2566 mutex_unlock(&info->device->mutex);
2567
2568 return retval;
2569}
2570
2571static ssize_t store_write_buffer_kb(struct device *dev,
2572 struct device_attribute *attr,
2573 const char *buf, size_t count)
2574{
2575 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2576 unsigned long new_size_kb;
2577 uint64_t new_size;
2578 int retval;
2579 struct comedi_subdevice *const write_subdevice =
0a85b6f0 2580 comedi_get_write_subdevice(info);
883db3d9
FMH		 2581
2582 if (strict_strtoul(buf, 10, &new_size_kb))
2583 return -EINVAL;
0a85b6f0 2584 if (new_size_kb != (uint32_t) new_size_kb)
883db3d9 2585 return -EINVAL;
0a85b6f0
MT		 2586 new_size = ((uint64_t) new_size_kb) * bytes_per_kibi;
2587 if (new_size != (uint32_t) new_size)
883db3d9
FMH		 2588 return -EINVAL;
2589
2590 mutex_lock(&info->device->mutex);
2591 if (write_subdevice == NULL ||
2592 (write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 ||
2593 write_subdevice->async == NULL) {
2594 mutex_unlock(&info->device->mutex);
2595 return -EINVAL;
2596 }
2597 retval = resize_async_buffer(info->device, write_subdevice,
0a85b6f0 2598 write_subdevice->async, new_size);
883db3d9
FMH		 2599 mutex_unlock(&info->device->mutex);
2600
2601 if (retval < 0)
2602 return retval;
2603 return count;
2604}
2605
2606static struct device_attribute dev_attr_write_buffer_kb = {
2607 .attr = {
0a85b6f0
MT		 2608 .name = "write_buffer_kb",
2609 .mode = S_IRUGO | S_IWUSR | S_IWGRP},
883db3d9
FMH		 2610 .show = &show_write_buffer_kb,
2611 .store = &store_write_buffer_kb
2612};
kernel source for telekom puls (alcatel/mediatek)