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Merge tag 'efi-urgent' into x86/urgent
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / staging / comedi / comedi_fops.c
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 #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>
45 #include <linux/stat.h>
46
47 #include <linux/io.h>
48 #include <linux/uaccess.h>
49
50 #include "comedi_internal.h"
51
52 #define COMEDI_NUM_MINORS 0x100
53 #define COMEDI_NUM_SUBDEVICE_MINORS \
54 (COMEDI_NUM_MINORS - COMEDI_NUM_BOARD_MINORS)
55
56 #ifdef CONFIG_COMEDI_DEBUG
57 int comedi_debug;
58 EXPORT_SYMBOL_GPL(comedi_debug);
59 module_param(comedi_debug, int, S_IRUGO | S_IWUSR);
60 MODULE_PARM_DESC(comedi_debug,
61 "enable comedi core and driver debugging if non-zero (default 0)"
62 );
63 #endif
64
65 static int comedi_num_legacy_minors;
66 module_param(comedi_num_legacy_minors, int, S_IRUGO);
67 MODULE_PARM_DESC(comedi_num_legacy_minors,
68 "number of comedi minor devices to reserve for non-auto-configured devices (default 0)"
69 );
70
71 unsigned int comedi_default_buf_size_kb = CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB;
72 module_param(comedi_default_buf_size_kb, uint, S_IRUGO | S_IWUSR);
73 MODULE_PARM_DESC(comedi_default_buf_size_kb,
74 "default asynchronous buffer size in KiB (default "
75 __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB) ")");
76
77 unsigned int comedi_default_buf_maxsize_kb
78 = CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB;
79 module_param(comedi_default_buf_maxsize_kb, uint, S_IRUGO | S_IWUSR);
80 MODULE_PARM_DESC(comedi_default_buf_maxsize_kb,
81 "default maximum size of asynchronous buffer in KiB (default "
82 __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB) ")");
83
84 static DEFINE_MUTEX(comedi_board_minor_table_lock);
85 static struct comedi_device
86 *comedi_board_minor_table[COMEDI_NUM_BOARD_MINORS];
87
88 static DEFINE_MUTEX(comedi_subdevice_minor_table_lock);
89 /* Note: indexed by minor - COMEDI_NUM_BOARD_MINORS. */
90 static struct comedi_subdevice
91 *comedi_subdevice_minor_table[COMEDI_NUM_SUBDEVICE_MINORS];
92
93 static struct class *comedi_class;
94 static struct cdev comedi_cdev;
95
96 static void comedi_device_init(struct comedi_device *dev)
97 {
98 spin_lock_init(&dev->spinlock);
99 mutex_init(&dev->mutex);
100 dev->minor = -1;
101 }
102
103 static void comedi_device_cleanup(struct comedi_device *dev)
104 {
105 struct module *driver_module = NULL;
106
107 if (dev == NULL)
108 return;
109 mutex_lock(&dev->mutex);
110 if (dev->attached)
111 driver_module = dev->driver->module;
112 comedi_device_detach(dev);
113 while (dev->use_count > 0) {
114 if (driver_module)
115 module_put(driver_module);
116 module_put(THIS_MODULE);
117 dev->use_count--;
118 }
119 mutex_unlock(&dev->mutex);
120 mutex_destroy(&dev->mutex);
121 }
122
123 static bool comedi_clear_board_dev(struct comedi_device *dev)
124 {
125 unsigned int i = dev->minor;
126 bool cleared = false;
127
128 mutex_lock(&comedi_board_minor_table_lock);
129 if (dev == comedi_board_minor_table[i]) {
130 comedi_board_minor_table[i] = NULL;
131 cleared = true;
132 }
133 mutex_unlock(&comedi_board_minor_table_lock);
134 return cleared;
135 }
136
137 static struct comedi_device *comedi_clear_board_minor(unsigned minor)
138 {
139 struct comedi_device *dev;
140
141 mutex_lock(&comedi_board_minor_table_lock);
142 dev = comedi_board_minor_table[minor];
143 comedi_board_minor_table[minor] = NULL;
144 mutex_unlock(&comedi_board_minor_table_lock);
145 return dev;
146 }
147
148 static void comedi_free_board_dev(struct comedi_device *dev)
149 {
150 if (dev) {
151 if (dev->class_dev) {
152 device_destroy(comedi_class,
153 MKDEV(COMEDI_MAJOR, dev->minor));
154 }
155 comedi_device_cleanup(dev);
156 kfree(dev);
157 }
158 }
159
160 static struct comedi_subdevice
161 *comedi_subdevice_from_minor(unsigned minor)
162 {
163 struct comedi_subdevice *s;
164 unsigned int i = minor - COMEDI_NUM_BOARD_MINORS;
165
166 BUG_ON(i >= COMEDI_NUM_SUBDEVICE_MINORS);
167 mutex_lock(&comedi_subdevice_minor_table_lock);
168 s = comedi_subdevice_minor_table[i];
169 mutex_unlock(&comedi_subdevice_minor_table_lock);
170 return s;
171 }
172
173 static struct comedi_device *comedi_dev_from_board_minor(unsigned minor)
174 {
175 struct comedi_device *dev;
176
177 BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS);
178 mutex_lock(&comedi_board_minor_table_lock);
179 dev = comedi_board_minor_table[minor];
180 mutex_unlock(&comedi_board_minor_table_lock);
181 return dev;
182 }
183
184 static struct comedi_device *comedi_dev_from_subdevice_minor(unsigned minor)
185 {
186 struct comedi_subdevice *s;
187
188 s = comedi_subdevice_from_minor(minor);
189 return s ? s->device : NULL;
190 }
191
192 struct comedi_device *comedi_dev_from_minor(unsigned minor)
193 {
194 if (minor < COMEDI_NUM_BOARD_MINORS)
195 return comedi_dev_from_board_minor(minor);
196 else
197 return comedi_dev_from_subdevice_minor(minor);
198 }
199 EXPORT_SYMBOL_GPL(comedi_dev_from_minor);
200
201 static struct comedi_subdevice *
202 comedi_read_subdevice(const struct comedi_device *dev, unsigned int minor)
203 {
204 struct comedi_subdevice *s;
205
206 if (minor >= COMEDI_NUM_BOARD_MINORS) {
207 s = comedi_subdevice_from_minor(minor);
208 if (!s || s->device != dev)
209 return NULL;
210 if (s->subdev_flags & SDF_CMD_READ)
211 return s;
212 }
213 return dev->read_subdev;
214 }
215
216 static struct comedi_subdevice *
217 comedi_write_subdevice(const struct comedi_device *dev, unsigned int minor)
218 {
219 struct comedi_subdevice *s;
220
221 if (minor >= COMEDI_NUM_BOARD_MINORS) {
222 s = comedi_subdevice_from_minor(minor);
223 if (!s || s->device != dev)
224 return NULL;
225 if (s->subdev_flags & SDF_CMD_WRITE)
226 return s;
227 }
228 return dev->write_subdev;
229 }
230
231 static int resize_async_buffer(struct comedi_device *dev,
232 struct comedi_subdevice *s,
233 struct comedi_async *async, unsigned new_size)
234 {
235 int retval;
236
237 if (new_size > async->max_bufsize)
238 return -EPERM;
239
240 if (s->busy) {
241 DPRINTK("subdevice is busy, cannot resize buffer\n");
242 return -EBUSY;
243 }
244 if (async->mmap_count) {
245 DPRINTK("subdevice is mmapped, cannot resize buffer\n");
246 return -EBUSY;
247 }
248
249 /* make sure buffer is an integral number of pages
250 * (we round up) */
251 new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK;
252
253 retval = comedi_buf_alloc(dev, s, new_size);
254 if (retval < 0)
255 return retval;
256
257 if (s->buf_change) {
258 retval = s->buf_change(dev, s, new_size);
259 if (retval < 0)
260 return retval;
261 }
262
263 DPRINTK("comedi%i subd %d buffer resized to %i bytes\n",
264 dev->minor, s->index, async->prealloc_bufsz);
265 return 0;
266 }
267
268 /* sysfs attribute files */
269
270 static ssize_t show_max_read_buffer_kb(struct device *csdev,
271 struct device_attribute *attr, char *buf)
272 {
273 unsigned int minor = MINOR(csdev->devt);
274 struct comedi_device *dev;
275 struct comedi_subdevice *s;
276 unsigned int size = 0;
277
278 dev = comedi_dev_from_minor(minor);
279 if (!dev)
280 return -ENODEV;
281
282 mutex_lock(&dev->mutex);
283 s = comedi_read_subdevice(dev, minor);
284 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
285 size = s->async->max_bufsize / 1024;
286 mutex_unlock(&dev->mutex);
287
288 return snprintf(buf, PAGE_SIZE, "%i\n", size);
289 }
290
291 static ssize_t store_max_read_buffer_kb(struct device *csdev,
292 struct device_attribute *attr,
293 const char *buf, size_t count)
294 {
295 unsigned int minor = MINOR(csdev->devt);
296 struct comedi_device *dev;
297 struct comedi_subdevice *s;
298 unsigned int size;
299 int err;
300
301 err = kstrtouint(buf, 10, &size);
302 if (err)
303 return err;
304 if (size > (UINT_MAX / 1024))
305 return -EINVAL;
306 size *= 1024;
307
308 dev = comedi_dev_from_minor(minor);
309 if (!dev)
310 return -ENODEV;
311
312 mutex_lock(&dev->mutex);
313 s = comedi_read_subdevice(dev, minor);
314 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
315 s->async->max_bufsize = size;
316 else
317 err = -EINVAL;
318 mutex_unlock(&dev->mutex);
319
320 return err ? err : count;
321 }
322
323 static ssize_t show_read_buffer_kb(struct device *csdev,
324 struct device_attribute *attr, char *buf)
325 {
326 unsigned int minor = MINOR(csdev->devt);
327 struct comedi_device *dev;
328 struct comedi_subdevice *s;
329 unsigned int size = 0;
330
331 dev = comedi_dev_from_minor(minor);
332 if (!dev)
333 return -ENODEV;
334
335 mutex_lock(&dev->mutex);
336 s = comedi_read_subdevice(dev, minor);
337 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
338 size = s->async->prealloc_bufsz / 1024;
339 mutex_unlock(&dev->mutex);
340
341 return snprintf(buf, PAGE_SIZE, "%i\n", size);
342 }
343
344 static ssize_t store_read_buffer_kb(struct device *csdev,
345 struct device_attribute *attr,
346 const char *buf, size_t count)
347 {
348 unsigned int minor = MINOR(csdev->devt);
349 struct comedi_device *dev;
350 struct comedi_subdevice *s;
351 unsigned int size;
352 int err;
353
354 err = kstrtouint(buf, 10, &size);
355 if (err)
356 return err;
357 if (size > (UINT_MAX / 1024))
358 return -EINVAL;
359 size *= 1024;
360
361 dev = comedi_dev_from_minor(minor);
362 if (!dev)
363 return -ENODEV;
364
365 mutex_lock(&dev->mutex);
366 s = comedi_read_subdevice(dev, minor);
367 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
368 err = resize_async_buffer(dev, s, s->async, size);
369 else
370 err = -EINVAL;
371 mutex_unlock(&dev->mutex);
372
373 return err ? err : count;
374 }
375
376 static ssize_t show_max_write_buffer_kb(struct device *csdev,
377 struct device_attribute *attr,
378 char *buf)
379 {
380 unsigned int minor = MINOR(csdev->devt);
381 struct comedi_device *dev;
382 struct comedi_subdevice *s;
383 unsigned int size = 0;
384
385 dev = comedi_dev_from_minor(minor);
386 if (!dev)
387 return -ENODEV;
388
389 mutex_lock(&dev->mutex);
390 s = comedi_write_subdevice(dev, minor);
391 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
392 size = s->async->max_bufsize / 1024;
393 mutex_unlock(&dev->mutex);
394
395 return snprintf(buf, PAGE_SIZE, "%i\n", size);
396 }
397
398 static ssize_t store_max_write_buffer_kb(struct device *csdev,
399 struct device_attribute *attr,
400 const char *buf, size_t count)
401 {
402 unsigned int minor = MINOR(csdev->devt);
403 struct comedi_device *dev;
404 struct comedi_subdevice *s;
405 unsigned int size;
406 int err;
407
408 err = kstrtouint(buf, 10, &size);
409 if (err)
410 return err;
411 if (size > (UINT_MAX / 1024))
412 return -EINVAL;
413 size *= 1024;
414
415 dev = comedi_dev_from_minor(minor);
416 if (!dev)
417 return -ENODEV;
418
419 mutex_lock(&dev->mutex);
420 s = comedi_write_subdevice(dev, minor);
421 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
422 s->async->max_bufsize = size;
423 else
424 err = -EINVAL;
425 mutex_unlock(&dev->mutex);
426
427 return err ? err : count;
428 }
429
430 static ssize_t show_write_buffer_kb(struct device *csdev,
431 struct device_attribute *attr, char *buf)
432 {
433 unsigned int minor = MINOR(csdev->devt);
434 struct comedi_device *dev;
435 struct comedi_subdevice *s;
436 unsigned int size = 0;
437
438 dev = comedi_dev_from_minor(minor);
439 if (!dev)
440 return -ENODEV;
441
442 mutex_lock(&dev->mutex);
443 s = comedi_write_subdevice(dev, minor);
444 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
445 size = s->async->prealloc_bufsz / 1024;
446 mutex_unlock(&dev->mutex);
447
448 return snprintf(buf, PAGE_SIZE, "%i\n", size);
449 }
450
451 static ssize_t store_write_buffer_kb(struct device *csdev,
452 struct device_attribute *attr,
453 const char *buf, size_t count)
454 {
455 unsigned int minor = MINOR(csdev->devt);
456 struct comedi_device *dev;
457 struct comedi_subdevice *s;
458 unsigned int size;
459 int err;
460
461 err = kstrtouint(buf, 10, &size);
462 if (err)
463 return err;
464 if (size > (UINT_MAX / 1024))
465 return -EINVAL;
466 size *= 1024;
467
468 dev = comedi_dev_from_minor(minor);
469 if (!dev)
470 return -ENODEV;
471
472 mutex_lock(&dev->mutex);
473 s = comedi_write_subdevice(dev, minor);
474 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
475 err = resize_async_buffer(dev, s, s->async, size);
476 else
477 err = -EINVAL;
478 mutex_unlock(&dev->mutex);
479
480 return err ? err : count;
481 }
482
483 static struct device_attribute comedi_dev_attrs[] = {
484 __ATTR(max_read_buffer_kb, S_IRUGO | S_IWUSR,
485 show_max_read_buffer_kb, store_max_read_buffer_kb),
486 __ATTR(read_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP,
487 show_read_buffer_kb, store_read_buffer_kb),
488 __ATTR(max_write_buffer_kb, S_IRUGO | S_IWUSR,
489 show_max_write_buffer_kb, store_max_write_buffer_kb),
490 __ATTR(write_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP,
491 show_write_buffer_kb, store_write_buffer_kb),
492 __ATTR_NULL
493 };
494
495 static void comedi_set_subdevice_runflags(struct comedi_subdevice *s,
496 unsigned mask, unsigned bits)
497 {
498 unsigned long flags;
499
500 spin_lock_irqsave(&s->spin_lock, flags);
501 s->runflags &= ~mask;
502 s->runflags |= (bits & mask);
503 spin_unlock_irqrestore(&s->spin_lock, flags);
504 }
505
506 static unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s)
507 {
508 unsigned long flags;
509 unsigned runflags;
510
511 spin_lock_irqsave(&s->spin_lock, flags);
512 runflags = s->runflags;
513 spin_unlock_irqrestore(&s->spin_lock, flags);
514 return runflags;
515 }
516
517 bool comedi_is_subdevice_running(struct comedi_subdevice *s)
518 {
519 unsigned runflags = comedi_get_subdevice_runflags(s);
520
521 return (runflags & SRF_RUNNING) ? true : false;
522 }
523 EXPORT_SYMBOL_GPL(comedi_is_subdevice_running);
524
525 static bool comedi_is_subdevice_in_error(struct comedi_subdevice *s)
526 {
527 unsigned runflags = comedi_get_subdevice_runflags(s);
528
529 return (runflags & SRF_ERROR) ? true : false;
530 }
531
532 static bool comedi_is_subdevice_idle(struct comedi_subdevice *s)
533 {
534 unsigned runflags = comedi_get_subdevice_runflags(s);
535
536 return (runflags & (SRF_ERROR | SRF_RUNNING)) ? false : true;
537 }
538
539 /*
540 This function restores a subdevice to an idle state.
541 */
542 static void do_become_nonbusy(struct comedi_device *dev,
543 struct comedi_subdevice *s)
544 {
545 struct comedi_async *async = s->async;
546
547 comedi_set_subdevice_runflags(s, SRF_RUNNING, 0);
548 if (async) {
549 comedi_buf_reset(async);
550 async->inttrig = NULL;
551 kfree(async->cmd.chanlist);
552 async->cmd.chanlist = NULL;
553 } else {
554 dev_err(dev->class_dev,
555 "BUG: (?) do_become_nonbusy called with async=NULL\n");
556 }
557
558 s->busy = NULL;
559 }
560
561 static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
562 {
563 int ret = 0;
564
565 if (comedi_is_subdevice_running(s) && s->cancel)
566 ret = s->cancel(dev, s);
567
568 do_become_nonbusy(dev, s);
569
570 return ret;
571 }
572
573 static int is_device_busy(struct comedi_device *dev)
574 {
575 struct comedi_subdevice *s;
576 int i;
577
578 if (!dev->attached)
579 return 0;
580
581 for (i = 0; i < dev->n_subdevices; i++) {
582 s = &dev->subdevices[i];
583 if (s->busy)
584 return 1;
585 if (s->async && s->async->mmap_count)
586 return 1;
587 }
588
589 return 0;
590 }
591
592 /*
593 COMEDI_DEVCONFIG
594 device config ioctl
595
596 arg:
597 pointer to devconfig structure
598
599 reads:
600 devconfig structure at arg
601
602 writes:
603 none
604 */
605 static int do_devconfig_ioctl(struct comedi_device *dev,
606 struct comedi_devconfig __user *arg)
607 {
608 struct comedi_devconfig it;
609
610 if (!capable(CAP_SYS_ADMIN))
611 return -EPERM;
612
613 if (arg == NULL) {
614 if (is_device_busy(dev))
615 return -EBUSY;
616 if (dev->attached) {
617 struct module *driver_module = dev->driver->module;
618 comedi_device_detach(dev);
619 module_put(driver_module);
620 }
621 return 0;
622 }
623
624 if (copy_from_user(&it, arg, sizeof(it)))
625 return -EFAULT;
626
627 it.board_name[COMEDI_NAMELEN - 1] = 0;
628
629 if (it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) {
630 dev_warn(dev->class_dev,
631 "comedi_config --init_data is deprecated\n");
632 return -EINVAL;
633 }
634
635 if (dev->minor >= comedi_num_legacy_minors)
636 /* don't re-use dynamically allocated comedi devices */
637 return -EBUSY;
638
639 /* This increments the driver module count on success. */
640 return comedi_device_attach(dev, &it);
641 }
642
643 /*
644 COMEDI_BUFCONFIG
645 buffer configuration ioctl
646
647 arg:
648 pointer to bufconfig structure
649
650 reads:
651 bufconfig at arg
652
653 writes:
654 modified bufconfig at arg
655
656 */
657 static int do_bufconfig_ioctl(struct comedi_device *dev,
658 struct comedi_bufconfig __user *arg)
659 {
660 struct comedi_bufconfig bc;
661 struct comedi_async *async;
662 struct comedi_subdevice *s;
663 int retval = 0;
664
665 if (copy_from_user(&bc, arg, sizeof(bc)))
666 return -EFAULT;
667
668 if (bc.subdevice >= dev->n_subdevices || bc.subdevice < 0)
669 return -EINVAL;
670
671 s = &dev->subdevices[bc.subdevice];
672 async = s->async;
673
674 if (!async) {
675 DPRINTK("subdevice does not have async capability\n");
676 bc.size = 0;
677 bc.maximum_size = 0;
678 goto copyback;
679 }
680
681 if (bc.maximum_size) {
682 if (!capable(CAP_SYS_ADMIN))
683 return -EPERM;
684
685 async->max_bufsize = bc.maximum_size;
686 }
687
688 if (bc.size) {
689 retval = resize_async_buffer(dev, s, async, bc.size);
690 if (retval < 0)
691 return retval;
692 }
693
694 bc.size = async->prealloc_bufsz;
695 bc.maximum_size = async->max_bufsize;
696
697 copyback:
698 if (copy_to_user(arg, &bc, sizeof(bc)))
699 return -EFAULT;
700
701 return 0;
702 }
703
704 /*
705 COMEDI_DEVINFO
706 device info ioctl
707
708 arg:
709 pointer to devinfo structure
710
711 reads:
712 none
713
714 writes:
715 devinfo structure
716
717 */
718 static int do_devinfo_ioctl(struct comedi_device *dev,
719 struct comedi_devinfo __user *arg,
720 struct file *file)
721 {
722 const unsigned minor = iminor(file_inode(file));
723 struct comedi_subdevice *s;
724 struct comedi_devinfo devinfo;
725
726 memset(&devinfo, 0, sizeof(devinfo));
727
728 /* fill devinfo structure */
729 devinfo.version_code = COMEDI_VERSION_CODE;
730 devinfo.n_subdevs = dev->n_subdevices;
731 strlcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN);
732 strlcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN);
733
734 s = comedi_read_subdevice(dev, minor);
735 if (s)
736 devinfo.read_subdevice = s->index;
737 else
738 devinfo.read_subdevice = -1;
739
740 s = comedi_write_subdevice(dev, minor);
741 if (s)
742 devinfo.write_subdevice = s->index;
743 else
744 devinfo.write_subdevice = -1;
745
746 if (copy_to_user(arg, &devinfo, sizeof(devinfo)))
747 return -EFAULT;
748
749 return 0;
750 }
751
752 /*
753 COMEDI_SUBDINFO
754 subdevice info ioctl
755
756 arg:
757 pointer to array of subdevice info structures
758
759 reads:
760 none
761
762 writes:
763 array of subdevice info structures at arg
764
765 */
766 static int do_subdinfo_ioctl(struct comedi_device *dev,
767 struct comedi_subdinfo __user *arg, void *file)
768 {
769 int ret, i;
770 struct comedi_subdinfo *tmp, *us;
771 struct comedi_subdevice *s;
772
773 tmp = kcalloc(dev->n_subdevices, sizeof(*tmp), GFP_KERNEL);
774 if (!tmp)
775 return -ENOMEM;
776
777 /* fill subdinfo structs */
778 for (i = 0; i < dev->n_subdevices; i++) {
779 s = &dev->subdevices[i];
780 us = tmp + i;
781
782 us->type = s->type;
783 us->n_chan = s->n_chan;
784 us->subd_flags = s->subdev_flags;
785 if (comedi_is_subdevice_running(s))
786 us->subd_flags |= SDF_RUNNING;
787 #define TIMER_nanosec 5 /* backwards compatibility */
788 us->timer_type = TIMER_nanosec;
789 us->len_chanlist = s->len_chanlist;
790 us->maxdata = s->maxdata;
791 if (s->range_table) {
792 us->range_type =
793 (i << 24) | (0 << 16) | (s->range_table->length);
794 } else {
795 us->range_type = 0; /* XXX */
796 }
797 us->flags = s->flags;
798
799 if (s->busy)
800 us->subd_flags |= SDF_BUSY;
801 if (s->busy == file)
802 us->subd_flags |= SDF_BUSY_OWNER;
803 if (s->lock)
804 us->subd_flags |= SDF_LOCKED;
805 if (s->lock == file)
806 us->subd_flags |= SDF_LOCK_OWNER;
807 if (!s->maxdata && s->maxdata_list)
808 us->subd_flags |= SDF_MAXDATA;
809 if (s->flaglist)
810 us->subd_flags |= SDF_FLAGS;
811 if (s->range_table_list)
812 us->subd_flags |= SDF_RANGETYPE;
813 if (s->do_cmd)
814 us->subd_flags |= SDF_CMD;
815
816 if (s->insn_bits != &insn_inval)
817 us->insn_bits_support = COMEDI_SUPPORTED;
818 else
819 us->insn_bits_support = COMEDI_UNSUPPORTED;
820
821 us->settling_time_0 = s->settling_time_0;
822 }
823
824 ret = copy_to_user(arg, tmp, dev->n_subdevices * sizeof(*tmp));
825
826 kfree(tmp);
827
828 return ret ? -EFAULT : 0;
829 }
830
831 /*
832 COMEDI_CHANINFO
833 subdevice info ioctl
834
835 arg:
836 pointer to chaninfo structure
837
838 reads:
839 chaninfo structure at arg
840
841 writes:
842 arrays at elements of chaninfo structure
843
844 */
845 static int do_chaninfo_ioctl(struct comedi_device *dev,
846 struct comedi_chaninfo __user *arg)
847 {
848 struct comedi_subdevice *s;
849 struct comedi_chaninfo it;
850
851 if (copy_from_user(&it, arg, sizeof(it)))
852 return -EFAULT;
853
854 if (it.subdev >= dev->n_subdevices)
855 return -EINVAL;
856 s = &dev->subdevices[it.subdev];
857
858 if (it.maxdata_list) {
859 if (s->maxdata || !s->maxdata_list)
860 return -EINVAL;
861 if (copy_to_user(it.maxdata_list, s->maxdata_list,
862 s->n_chan * sizeof(unsigned int)))
863 return -EFAULT;
864 }
865
866 if (it.flaglist) {
867 if (!s->flaglist)
868 return -EINVAL;
869 if (copy_to_user(it.flaglist, s->flaglist,
870 s->n_chan * sizeof(unsigned int)))
871 return -EFAULT;
872 }
873
874 if (it.rangelist) {
875 int i;
876
877 if (!s->range_table_list)
878 return -EINVAL;
879 for (i = 0; i < s->n_chan; i++) {
880 int x;
881
882 x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) |
883 (s->range_table_list[i]->length);
884 if (put_user(x, it.rangelist + i))
885 return -EFAULT;
886 }
887 #if 0
888 if (copy_to_user(it.rangelist, s->range_type_list,
889 s->n_chan * sizeof(unsigned int)))
890 return -EFAULT;
891 #endif
892 }
893
894 return 0;
895 }
896
897 /*
898 COMEDI_BUFINFO
899 buffer information ioctl
900
901 arg:
902 pointer to bufinfo structure
903
904 reads:
905 bufinfo at arg
906
907 writes:
908 modified bufinfo at arg
909
910 */
911 static int do_bufinfo_ioctl(struct comedi_device *dev,
912 struct comedi_bufinfo __user *arg, void *file)
913 {
914 struct comedi_bufinfo bi;
915 struct comedi_subdevice *s;
916 struct comedi_async *async;
917
918 if (copy_from_user(&bi, arg, sizeof(bi)))
919 return -EFAULT;
920
921 if (bi.subdevice >= dev->n_subdevices || bi.subdevice < 0)
922 return -EINVAL;
923
924 s = &dev->subdevices[bi.subdevice];
925
926 if (s->lock && s->lock != file)
927 return -EACCES;
928
929 async = s->async;
930
931 if (!async) {
932 DPRINTK("subdevice does not have async capability\n");
933 bi.buf_write_ptr = 0;
934 bi.buf_read_ptr = 0;
935 bi.buf_write_count = 0;
936 bi.buf_read_count = 0;
937 bi.bytes_read = 0;
938 bi.bytes_written = 0;
939 goto copyback;
940 }
941 if (!s->busy) {
942 bi.bytes_read = 0;
943 bi.bytes_written = 0;
944 goto copyback_position;
945 }
946 if (s->busy != file)
947 return -EACCES;
948
949 if (bi.bytes_read && (s->subdev_flags & SDF_CMD_READ)) {
950 bi.bytes_read = comedi_buf_read_alloc(async, bi.bytes_read);
951 comedi_buf_read_free(async, bi.bytes_read);
952
953 if (comedi_is_subdevice_idle(s) &&
954 async->buf_write_count == async->buf_read_count) {
955 do_become_nonbusy(dev, s);
956 }
957 }
958
959 if (bi.bytes_written && (s->subdev_flags & SDF_CMD_WRITE)) {
960 bi.bytes_written =
961 comedi_buf_write_alloc(async, bi.bytes_written);
962 comedi_buf_write_free(async, bi.bytes_written);
963 }
964
965 copyback_position:
966 bi.buf_write_count = async->buf_write_count;
967 bi.buf_write_ptr = async->buf_write_ptr;
968 bi.buf_read_count = async->buf_read_count;
969 bi.buf_read_ptr = async->buf_read_ptr;
970
971 copyback:
972 if (copy_to_user(arg, &bi, sizeof(bi)))
973 return -EFAULT;
974
975 return 0;
976 }
977
978 static int check_insn_config_length(struct comedi_insn *insn,
979 unsigned int *data)
980 {
981 if (insn->n < 1)
982 return -EINVAL;
983
984 switch (data[0]) {
985 case INSN_CONFIG_DIO_OUTPUT:
986 case INSN_CONFIG_DIO_INPUT:
987 case INSN_CONFIG_DISARM:
988 case INSN_CONFIG_RESET:
989 if (insn->n == 1)
990 return 0;
991 break;
992 case INSN_CONFIG_ARM:
993 case INSN_CONFIG_DIO_QUERY:
994 case INSN_CONFIG_BLOCK_SIZE:
995 case INSN_CONFIG_FILTER:
996 case INSN_CONFIG_SERIAL_CLOCK:
997 case INSN_CONFIG_BIDIRECTIONAL_DATA:
998 case INSN_CONFIG_ALT_SOURCE:
999 case INSN_CONFIG_SET_COUNTER_MODE:
1000 case INSN_CONFIG_8254_READ_STATUS:
1001 case INSN_CONFIG_SET_ROUTING:
1002 case INSN_CONFIG_GET_ROUTING:
1003 case INSN_CONFIG_GET_PWM_STATUS:
1004 case INSN_CONFIG_PWM_SET_PERIOD:
1005 case INSN_CONFIG_PWM_GET_PERIOD:
1006 if (insn->n == 2)
1007 return 0;
1008 break;
1009 case INSN_CONFIG_SET_GATE_SRC:
1010 case INSN_CONFIG_GET_GATE_SRC:
1011 case INSN_CONFIG_SET_CLOCK_SRC:
1012 case INSN_CONFIG_GET_CLOCK_SRC:
1013 case INSN_CONFIG_SET_OTHER_SRC:
1014 case INSN_CONFIG_GET_COUNTER_STATUS:
1015 case INSN_CONFIG_PWM_SET_H_BRIDGE:
1016 case INSN_CONFIG_PWM_GET_H_BRIDGE:
1017 case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE:
1018 if (insn->n == 3)
1019 return 0;
1020 break;
1021 case INSN_CONFIG_PWM_OUTPUT:
1022 case INSN_CONFIG_ANALOG_TRIG:
1023 if (insn->n == 5)
1024 return 0;
1025 break;
1026 case INSN_CONFIG_DIGITAL_TRIG:
1027 if (insn->n == 6)
1028 return 0;
1029 break;
1030 /* by default we allow the insn since we don't have checks for
1031 * all possible cases yet */
1032 default:
1033 pr_warn("comedi: No check for data length of config insn id %i is implemented.\n",
1034 data[0]);
1035 pr_warn("comedi: Add a check to %s in %s.\n",
1036 __func__, __FILE__);
1037 pr_warn("comedi: Assuming n=%i is correct.\n", insn->n);
1038 return 0;
1039 }
1040 return -EINVAL;
1041 }
1042
1043 static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn,
1044 unsigned int *data, void *file)
1045 {
1046 struct comedi_subdevice *s;
1047 int ret = 0;
1048 int i;
1049
1050 if (insn->insn & INSN_MASK_SPECIAL) {
1051 /* a non-subdevice instruction */
1052
1053 switch (insn->insn) {
1054 case INSN_GTOD:
1055 {
1056 struct timeval tv;
1057
1058 if (insn->n != 2) {
1059 ret = -EINVAL;
1060 break;
1061 }
1062
1063 do_gettimeofday(&tv);
1064 data[0] = tv.tv_sec;
1065 data[1] = tv.tv_usec;
1066 ret = 2;
1067
1068 break;
1069 }
1070 case INSN_WAIT:
1071 if (insn->n != 1 || data[0] >= 100000) {
1072 ret = -EINVAL;
1073 break;
1074 }
1075 udelay(data[0] / 1000);
1076 ret = 1;
1077 break;
1078 case INSN_INTTRIG:
1079 if (insn->n != 1) {
1080 ret = -EINVAL;
1081 break;
1082 }
1083 if (insn->subdev >= dev->n_subdevices) {
1084 DPRINTK("%d not usable subdevice\n",
1085 insn->subdev);
1086 ret = -EINVAL;
1087 break;
1088 }
1089 s = &dev->subdevices[insn->subdev];
1090 if (!s->async) {
1091 DPRINTK("no async\n");
1092 ret = -EINVAL;
1093 break;
1094 }
1095 if (!s->async->inttrig) {
1096 DPRINTK("no inttrig\n");
1097 ret = -EAGAIN;
1098 break;
1099 }
1100 ret = s->async->inttrig(dev, s, data[0]);
1101 if (ret >= 0)
1102 ret = 1;
1103 break;
1104 default:
1105 DPRINTK("invalid insn\n");
1106 ret = -EINVAL;
1107 break;
1108 }
1109 } else {
1110 /* a subdevice instruction */
1111 unsigned int maxdata;
1112
1113 if (insn->subdev >= dev->n_subdevices) {
1114 DPRINTK("subdevice %d out of range\n", insn->subdev);
1115 ret = -EINVAL;
1116 goto out;
1117 }
1118 s = &dev->subdevices[insn->subdev];
1119
1120 if (s->type == COMEDI_SUBD_UNUSED) {
1121 DPRINTK("%d not usable subdevice\n", insn->subdev);
1122 ret = -EIO;
1123 goto out;
1124 }
1125
1126 /* are we locked? (ioctl lock) */
1127 if (s->lock && s->lock != file) {
1128 DPRINTK("device locked\n");
1129 ret = -EACCES;
1130 goto out;
1131 }
1132
1133 ret = comedi_check_chanlist(s, 1, &insn->chanspec);
1134 if (ret < 0) {
1135 ret = -EINVAL;
1136 DPRINTK("bad chanspec\n");
1137 goto out;
1138 }
1139
1140 if (s->busy) {
1141 ret = -EBUSY;
1142 goto out;
1143 }
1144 /* This looks arbitrary. It is. */
1145 s->busy = &parse_insn;
1146 switch (insn->insn) {
1147 case INSN_READ:
1148 ret = s->insn_read(dev, s, insn, data);
1149 break;
1150 case INSN_WRITE:
1151 maxdata = s->maxdata_list
1152 ? s->maxdata_list[CR_CHAN(insn->chanspec)]
1153 : s->maxdata;
1154 for (i = 0; i < insn->n; ++i) {
1155 if (data[i] > maxdata) {
1156 ret = -EINVAL;
1157 DPRINTK("bad data value(s)\n");
1158 break;
1159 }
1160 }
1161 if (ret == 0)
1162 ret = s->insn_write(dev, s, insn, data);
1163 break;
1164 case INSN_BITS:
1165 if (insn->n != 2) {
1166 ret = -EINVAL;
1167 } else {
1168 /* Most drivers ignore the base channel in
1169 * insn->chanspec. Fix this here if
1170 * the subdevice has <= 32 channels. */
1171 unsigned int shift;
1172 unsigned int orig_mask;
1173
1174 orig_mask = data[0];
1175 if (s->n_chan <= 32) {
1176 shift = CR_CHAN(insn->chanspec);
1177 if (shift > 0) {
1178 insn->chanspec = 0;
1179 data[0] <<= shift;
1180 data[1] <<= shift;
1181 }
1182 } else
1183 shift = 0;
1184 ret = s->insn_bits(dev, s, insn, data);
1185 data[0] = orig_mask;
1186 if (shift > 0)
1187 data[1] >>= shift;
1188 }
1189 break;
1190 case INSN_CONFIG:
1191 ret = check_insn_config_length(insn, data);
1192 if (ret)
1193 break;
1194 ret = s->insn_config(dev, s, insn, data);
1195 break;
1196 default:
1197 ret = -EINVAL;
1198 break;
1199 }
1200
1201 s->busy = NULL;
1202 }
1203
1204 out:
1205 return ret;
1206 }
1207
1208 /*
1209 * COMEDI_INSNLIST
1210 * synchronous instructions
1211 *
1212 * arg:
1213 * pointer to sync cmd structure
1214 *
1215 * reads:
1216 * sync cmd struct at arg
1217 * instruction list
1218 * data (for writes)
1219 *
1220 * writes:
1221 * data (for reads)
1222 */
1223 /* arbitrary limits */
1224 #define MAX_SAMPLES 256
1225 static int do_insnlist_ioctl(struct comedi_device *dev,
1226 struct comedi_insnlist __user *arg, void *file)
1227 {
1228 struct comedi_insnlist insnlist;
1229 struct comedi_insn *insns = NULL;
1230 unsigned int *data = NULL;
1231 int i = 0;
1232 int ret = 0;
1233
1234 if (copy_from_user(&insnlist, arg, sizeof(insnlist)))
1235 return -EFAULT;
1236
1237 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL);
1238 if (!data) {
1239 DPRINTK("kmalloc failed\n");
1240 ret = -ENOMEM;
1241 goto error;
1242 }
1243
1244 insns = kcalloc(insnlist.n_insns, sizeof(*insns), GFP_KERNEL);
1245 if (!insns) {
1246 DPRINTK("kmalloc failed\n");
1247 ret = -ENOMEM;
1248 goto error;
1249 }
1250
1251 if (copy_from_user(insns, insnlist.insns,
1252 sizeof(*insns) * insnlist.n_insns)) {
1253 DPRINTK("copy_from_user failed\n");
1254 ret = -EFAULT;
1255 goto error;
1256 }
1257
1258 for (i = 0; i < insnlist.n_insns; i++) {
1259 if (insns[i].n > MAX_SAMPLES) {
1260 DPRINTK("number of samples too large\n");
1261 ret = -EINVAL;
1262 goto error;
1263 }
1264 if (insns[i].insn & INSN_MASK_WRITE) {
1265 if (copy_from_user(data, insns[i].data,
1266 insns[i].n * sizeof(unsigned int))) {
1267 DPRINTK("copy_from_user failed\n");
1268 ret = -EFAULT;
1269 goto error;
1270 }
1271 }
1272 ret = parse_insn(dev, insns + i, data, file);
1273 if (ret < 0)
1274 goto error;
1275 if (insns[i].insn & INSN_MASK_READ) {
1276 if (copy_to_user(insns[i].data, data,
1277 insns[i].n * sizeof(unsigned int))) {
1278 DPRINTK("copy_to_user failed\n");
1279 ret = -EFAULT;
1280 goto error;
1281 }
1282 }
1283 if (need_resched())
1284 schedule();
1285 }
1286
1287 error:
1288 kfree(insns);
1289 kfree(data);
1290
1291 if (ret < 0)
1292 return ret;
1293 return i;
1294 }
1295
1296 /*
1297 * COMEDI_INSN
1298 * synchronous instructions
1299 *
1300 * arg:
1301 * pointer to insn
1302 *
1303 * reads:
1304 * struct comedi_insn struct at arg
1305 * data (for writes)
1306 *
1307 * writes:
1308 * data (for reads)
1309 */
1310 static int do_insn_ioctl(struct comedi_device *dev,
1311 struct comedi_insn __user *arg, void *file)
1312 {
1313 struct comedi_insn insn;
1314 unsigned int *data = NULL;
1315 int ret = 0;
1316
1317 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL);
1318 if (!data) {
1319 ret = -ENOMEM;
1320 goto error;
1321 }
1322
1323 if (copy_from_user(&insn, arg, sizeof(insn))) {
1324 ret = -EFAULT;
1325 goto error;
1326 }
1327
1328 /* This is where the behavior of insn and insnlist deviate. */
1329 if (insn.n > MAX_SAMPLES)
1330 insn.n = MAX_SAMPLES;
1331 if (insn.insn & INSN_MASK_WRITE) {
1332 if (copy_from_user(data,
1333 insn.data,
1334 insn.n * sizeof(unsigned int))) {
1335 ret = -EFAULT;
1336 goto error;
1337 }
1338 }
1339 ret = parse_insn(dev, &insn, data, file);
1340 if (ret < 0)
1341 goto error;
1342 if (insn.insn & INSN_MASK_READ) {
1343 if (copy_to_user(insn.data,
1344 data,
1345 insn.n * sizeof(unsigned int))) {
1346 ret = -EFAULT;
1347 goto error;
1348 }
1349 }
1350 ret = insn.n;
1351
1352 error:
1353 kfree(data);
1354
1355 return ret;
1356 }
1357
1358 static int do_cmd_ioctl(struct comedi_device *dev,
1359 struct comedi_cmd __user *arg, void *file)
1360 {
1361 struct comedi_cmd cmd;
1362 struct comedi_subdevice *s;
1363 struct comedi_async *async;
1364 int ret = 0;
1365 unsigned int __user *user_chanlist;
1366
1367 if (copy_from_user(&cmd, arg, sizeof(cmd))) {
1368 DPRINTK("bad cmd address\n");
1369 return -EFAULT;
1370 }
1371 /* save user's chanlist pointer so it can be restored later */
1372 user_chanlist = (unsigned int __user *)cmd.chanlist;
1373
1374 if (cmd.subdev >= dev->n_subdevices) {
1375 DPRINTK("%d no such subdevice\n", cmd.subdev);
1376 return -ENODEV;
1377 }
1378
1379 s = &dev->subdevices[cmd.subdev];
1380 async = s->async;
1381
1382 if (s->type == COMEDI_SUBD_UNUSED) {
1383 DPRINTK("%d not valid subdevice\n", cmd.subdev);
1384 return -EIO;
1385 }
1386
1387 if (!s->do_cmd || !s->do_cmdtest || !s->async) {
1388 DPRINTK("subdevice %i does not support commands\n",
1389 cmd.subdev);
1390 return -EIO;
1391 }
1392
1393 /* are we locked? (ioctl lock) */
1394 if (s->lock && s->lock != file) {
1395 DPRINTK("subdevice locked\n");
1396 return -EACCES;
1397 }
1398
1399 /* are we busy? */
1400 if (s->busy) {
1401 DPRINTK("subdevice busy\n");
1402 return -EBUSY;
1403 }
1404 s->busy = file;
1405
1406 /* make sure channel/gain list isn't too long */
1407 if (cmd.chanlist_len > s->len_chanlist) {
1408 DPRINTK("channel/gain list too long %u > %d\n",
1409 cmd.chanlist_len, s->len_chanlist);
1410 ret = -EINVAL;
1411 goto cleanup;
1412 }
1413
1414 /* make sure channel/gain list isn't too short */
1415 if (cmd.chanlist_len < 1) {
1416 DPRINTK("channel/gain list too short %u < 1\n",
1417 cmd.chanlist_len);
1418 ret = -EINVAL;
1419 goto cleanup;
1420 }
1421
1422 async->cmd = cmd;
1423 async->cmd.data = NULL;
1424 /* load channel/gain list */
1425 async->cmd.chanlist =
1426 kmalloc(async->cmd.chanlist_len * sizeof(int), GFP_KERNEL);
1427 if (!async->cmd.chanlist) {
1428 DPRINTK("allocation failed\n");
1429 ret = -ENOMEM;
1430 goto cleanup;
1431 }
1432
1433 if (copy_from_user(async->cmd.chanlist, user_chanlist,
1434 async->cmd.chanlist_len * sizeof(int))) {
1435 DPRINTK("fault reading chanlist\n");
1436 ret = -EFAULT;
1437 goto cleanup;
1438 }
1439
1440 /* make sure each element in channel/gain list is valid */
1441 ret = comedi_check_chanlist(s,
1442 async->cmd.chanlist_len,
1443 async->cmd.chanlist);
1444 if (ret < 0) {
1445 DPRINTK("bad chanlist\n");
1446 goto cleanup;
1447 }
1448
1449 ret = s->do_cmdtest(dev, s, &async->cmd);
1450
1451 if (async->cmd.flags & TRIG_BOGUS || ret) {
1452 DPRINTK("test returned %d\n", ret);
1453 cmd = async->cmd;
1454 /* restore chanlist pointer before copying back */
1455 cmd.chanlist = (unsigned int __force *)user_chanlist;
1456 cmd.data = NULL;
1457 if (copy_to_user(arg, &cmd, sizeof(cmd))) {
1458 DPRINTK("fault writing cmd\n");
1459 ret = -EFAULT;
1460 goto cleanup;
1461 }
1462 ret = -EAGAIN;
1463 goto cleanup;
1464 }
1465
1466 if (!async->prealloc_bufsz) {
1467 ret = -ENOMEM;
1468 DPRINTK("no buffer (?)\n");
1469 goto cleanup;
1470 }
1471
1472 comedi_buf_reset(async);
1473
1474 async->cb_mask =
1475 COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR |
1476 COMEDI_CB_OVERFLOW;
1477 if (async->cmd.flags & TRIG_WAKE_EOS)
1478 async->cb_mask |= COMEDI_CB_EOS;
1479
1480 comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING);
1481
1482 ret = s->do_cmd(dev, s);
1483 if (ret == 0)
1484 return 0;
1485
1486 cleanup:
1487 do_become_nonbusy(dev, s);
1488
1489 return ret;
1490 }
1491
1492 /*
1493 COMEDI_CMDTEST
1494 command testing ioctl
1495
1496 arg:
1497 pointer to cmd structure
1498
1499 reads:
1500 cmd structure at arg
1501 channel/range list
1502
1503 writes:
1504 modified cmd structure at arg
1505
1506 */
1507 static int do_cmdtest_ioctl(struct comedi_device *dev,
1508 struct comedi_cmd __user *arg, void *file)
1509 {
1510 struct comedi_cmd cmd;
1511 struct comedi_subdevice *s;
1512 int ret = 0;
1513 unsigned int *chanlist = NULL;
1514 unsigned int __user *user_chanlist;
1515
1516 if (copy_from_user(&cmd, arg, sizeof(cmd))) {
1517 DPRINTK("bad cmd address\n");
1518 return -EFAULT;
1519 }
1520 /* save user's chanlist pointer so it can be restored later */
1521 user_chanlist = (unsigned int __user *)cmd.chanlist;
1522
1523 if (cmd.subdev >= dev->n_subdevices) {
1524 DPRINTK("%d no such subdevice\n", cmd.subdev);
1525 return -ENODEV;
1526 }
1527
1528 s = &dev->subdevices[cmd.subdev];
1529 if (s->type == COMEDI_SUBD_UNUSED) {
1530 DPRINTK("%d not valid subdevice\n", cmd.subdev);
1531 return -EIO;
1532 }
1533
1534 if (!s->do_cmd || !s->do_cmdtest) {
1535 DPRINTK("subdevice %i does not support commands\n",
1536 cmd.subdev);
1537 return -EIO;
1538 }
1539
1540 /* make sure channel/gain list isn't too long */
1541 if (cmd.chanlist_len > s->len_chanlist) {
1542 DPRINTK("channel/gain list too long %d > %d\n",
1543 cmd.chanlist_len, s->len_chanlist);
1544 ret = -EINVAL;
1545 goto cleanup;
1546 }
1547
1548 /* load channel/gain list */
1549 if (cmd.chanlist) {
1550 chanlist =
1551 kmalloc(cmd.chanlist_len * sizeof(int), GFP_KERNEL);
1552 if (!chanlist) {
1553 DPRINTK("allocation failed\n");
1554 ret = -ENOMEM;
1555 goto cleanup;
1556 }
1557
1558 if (copy_from_user(chanlist, user_chanlist,
1559 cmd.chanlist_len * sizeof(int))) {
1560 DPRINTK("fault reading chanlist\n");
1561 ret = -EFAULT;
1562 goto cleanup;
1563 }
1564
1565 /* make sure each element in channel/gain list is valid */
1566 ret = comedi_check_chanlist(s, cmd.chanlist_len, chanlist);
1567 if (ret < 0) {
1568 DPRINTK("bad chanlist\n");
1569 goto cleanup;
1570 }
1571
1572 cmd.chanlist = chanlist;
1573 }
1574
1575 ret = s->do_cmdtest(dev, s, &cmd);
1576
1577 /* restore chanlist pointer before copying back */
1578 cmd.chanlist = (unsigned int __force *)user_chanlist;
1579
1580 if (copy_to_user(arg, &cmd, sizeof(cmd))) {
1581 DPRINTK("bad cmd address\n");
1582 ret = -EFAULT;
1583 goto cleanup;
1584 }
1585 cleanup:
1586 kfree(chanlist);
1587
1588 return ret;
1589 }
1590
1591 /*
1592 COMEDI_LOCK
1593 lock subdevice
1594
1595 arg:
1596 subdevice number
1597
1598 reads:
1599 none
1600
1601 writes:
1602 none
1603
1604 */
1605
1606 static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg,
1607 void *file)
1608 {
1609 int ret = 0;
1610 unsigned long flags;
1611 struct comedi_subdevice *s;
1612
1613 if (arg >= dev->n_subdevices)
1614 return -EINVAL;
1615 s = &dev->subdevices[arg];
1616
1617 spin_lock_irqsave(&s->spin_lock, flags);
1618 if (s->busy || s->lock)
1619 ret = -EBUSY;
1620 else
1621 s->lock = file;
1622 spin_unlock_irqrestore(&s->spin_lock, flags);
1623
1624 #if 0
1625 if (ret < 0)
1626 return ret;
1627
1628 if (s->lock_f)
1629 ret = s->lock_f(dev, s);
1630 #endif
1631
1632 return ret;
1633 }
1634
1635 /*
1636 COMEDI_UNLOCK
1637 unlock subdevice
1638
1639 arg:
1640 subdevice number
1641
1642 reads:
1643 none
1644
1645 writes:
1646 none
1647
1648 This function isn't protected by the semaphore, since
1649 we already own the lock.
1650 */
1651 static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg,
1652 void *file)
1653 {
1654 struct comedi_subdevice *s;
1655
1656 if (arg >= dev->n_subdevices)
1657 return -EINVAL;
1658 s = &dev->subdevices[arg];
1659
1660 if (s->busy)
1661 return -EBUSY;
1662
1663 if (s->lock && s->lock != file)
1664 return -EACCES;
1665
1666 if (s->lock == file) {
1667 #if 0
1668 if (s->unlock)
1669 s->unlock(dev, s);
1670 #endif
1671
1672 s->lock = NULL;
1673 }
1674
1675 return 0;
1676 }
1677
1678 /*
1679 COMEDI_CANCEL
1680 cancel acquisition ioctl
1681
1682 arg:
1683 subdevice number
1684
1685 reads:
1686 nothing
1687
1688 writes:
1689 nothing
1690
1691 */
1692 static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg,
1693 void *file)
1694 {
1695 struct comedi_subdevice *s;
1696
1697 if (arg >= dev->n_subdevices)
1698 return -EINVAL;
1699 s = &dev->subdevices[arg];
1700 if (s->async == NULL)
1701 return -EINVAL;
1702
1703 if (s->lock && s->lock != file)
1704 return -EACCES;
1705
1706 if (!s->busy)
1707 return 0;
1708
1709 if (s->busy != file)
1710 return -EBUSY;
1711
1712 return do_cancel(dev, s);
1713 }
1714
1715 /*
1716 COMEDI_POLL ioctl
1717 instructs driver to synchronize buffers
1718
1719 arg:
1720 subdevice number
1721
1722 reads:
1723 nothing
1724
1725 writes:
1726 nothing
1727
1728 */
1729 static int do_poll_ioctl(struct comedi_device *dev, unsigned int arg,
1730 void *file)
1731 {
1732 struct comedi_subdevice *s;
1733
1734 if (arg >= dev->n_subdevices)
1735 return -EINVAL;
1736 s = &dev->subdevices[arg];
1737
1738 if (s->lock && s->lock != file)
1739 return -EACCES;
1740
1741 if (!s->busy)
1742 return 0;
1743
1744 if (s->busy != file)
1745 return -EBUSY;
1746
1747 if (s->poll)
1748 return s->poll(dev, s);
1749
1750 return -EINVAL;
1751 }
1752
1753 static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd,
1754 unsigned long arg)
1755 {
1756 const unsigned minor = iminor(file_inode(file));
1757 struct comedi_device *dev = comedi_dev_from_minor(minor);
1758 int rc;
1759
1760 if (!dev)
1761 return -ENODEV;
1762
1763 mutex_lock(&dev->mutex);
1764
1765 /* Device config is special, because it must work on
1766 * an unconfigured device. */
1767 if (cmd == COMEDI_DEVCONFIG) {
1768 if (minor >= COMEDI_NUM_BOARD_MINORS) {
1769 /* Device config not appropriate on non-board minors. */
1770 rc = -ENOTTY;
1771 goto done;
1772 }
1773 rc = do_devconfig_ioctl(dev,
1774 (struct comedi_devconfig __user *)arg);
1775 if (rc == 0) {
1776 if (arg == 0 &&
1777 dev->minor >= comedi_num_legacy_minors) {
1778 /* Successfully unconfigured a dynamically
1779 * allocated device. Try and remove it. */
1780 if (comedi_clear_board_dev(dev)) {
1781 mutex_unlock(&dev->mutex);
1782 comedi_free_board_dev(dev);
1783 return rc;
1784 }
1785 }
1786 }
1787 goto done;
1788 }
1789
1790 if (!dev->attached) {
1791 DPRINTK("no driver configured on /dev/comedi%i\n", dev->minor);
1792 rc = -ENODEV;
1793 goto done;
1794 }
1795
1796 switch (cmd) {
1797 case COMEDI_BUFCONFIG:
1798 rc = do_bufconfig_ioctl(dev,
1799 (struct comedi_bufconfig __user *)arg);
1800 break;
1801 case COMEDI_DEVINFO:
1802 rc = do_devinfo_ioctl(dev, (struct comedi_devinfo __user *)arg,
1803 file);
1804 break;
1805 case COMEDI_SUBDINFO:
1806 rc = do_subdinfo_ioctl(dev,
1807 (struct comedi_subdinfo __user *)arg,
1808 file);
1809 break;
1810 case COMEDI_CHANINFO:
1811 rc = do_chaninfo_ioctl(dev, (void __user *)arg);
1812 break;
1813 case COMEDI_RANGEINFO:
1814 rc = do_rangeinfo_ioctl(dev, (void __user *)arg);
1815 break;
1816 case COMEDI_BUFINFO:
1817 rc = do_bufinfo_ioctl(dev,
1818 (struct comedi_bufinfo __user *)arg,
1819 file);
1820 break;
1821 case COMEDI_LOCK:
1822 rc = do_lock_ioctl(dev, arg, file);
1823 break;
1824 case COMEDI_UNLOCK:
1825 rc = do_unlock_ioctl(dev, arg, file);
1826 break;
1827 case COMEDI_CANCEL:
1828 rc = do_cancel_ioctl(dev, arg, file);
1829 break;
1830 case COMEDI_CMD:
1831 rc = do_cmd_ioctl(dev, (struct comedi_cmd __user *)arg, file);
1832 break;
1833 case COMEDI_CMDTEST:
1834 rc = do_cmdtest_ioctl(dev, (struct comedi_cmd __user *)arg,
1835 file);
1836 break;
1837 case COMEDI_INSNLIST:
1838 rc = do_insnlist_ioctl(dev,
1839 (struct comedi_insnlist __user *)arg,
1840 file);
1841 break;
1842 case COMEDI_INSN:
1843 rc = do_insn_ioctl(dev, (struct comedi_insn __user *)arg,
1844 file);
1845 break;
1846 case COMEDI_POLL:
1847 rc = do_poll_ioctl(dev, arg, file);
1848 break;
1849 default:
1850 rc = -ENOTTY;
1851 break;
1852 }
1853
1854 done:
1855 mutex_unlock(&dev->mutex);
1856 return rc;
1857 }
1858
1859 static void comedi_vm_open(struct vm_area_struct *area)
1860 {
1861 struct comedi_async *async;
1862 struct comedi_device *dev;
1863
1864 async = area->vm_private_data;
1865 dev = async->subdevice->device;
1866
1867 mutex_lock(&dev->mutex);
1868 async->mmap_count++;
1869 mutex_unlock(&dev->mutex);
1870 }
1871
1872 static void comedi_vm_close(struct vm_area_struct *area)
1873 {
1874 struct comedi_async *async;
1875 struct comedi_device *dev;
1876
1877 async = area->vm_private_data;
1878 dev = async->subdevice->device;
1879
1880 mutex_lock(&dev->mutex);
1881 async->mmap_count--;
1882 mutex_unlock(&dev->mutex);
1883 }
1884
1885 static struct vm_operations_struct comedi_vm_ops = {
1886 .open = comedi_vm_open,
1887 .close = comedi_vm_close,
1888 };
1889
1890 static int comedi_mmap(struct file *file, struct vm_area_struct *vma)
1891 {
1892 const unsigned minor = iminor(file_inode(file));
1893 struct comedi_device *dev = comedi_dev_from_minor(minor);
1894 struct comedi_subdevice *s;
1895 struct comedi_async *async;
1896 unsigned long start = vma->vm_start;
1897 unsigned long size;
1898 int n_pages;
1899 int i;
1900 int retval;
1901
1902 if (!dev)
1903 return -ENODEV;
1904
1905 mutex_lock(&dev->mutex);
1906
1907 if (!dev->attached) {
1908 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1909 retval = -ENODEV;
1910 goto done;
1911 }
1912
1913 if (vma->vm_flags & VM_WRITE)
1914 s = comedi_write_subdevice(dev, minor);
1915 else
1916 s = comedi_read_subdevice(dev, minor);
1917 if (!s) {
1918 retval = -EINVAL;
1919 goto done;
1920 }
1921
1922 async = s->async;
1923 if (!async) {
1924 retval = -EINVAL;
1925 goto done;
1926 }
1927
1928 if (vma->vm_pgoff != 0) {
1929 DPRINTK("comedi: mmap() offset must be 0.\n");
1930 retval = -EINVAL;
1931 goto done;
1932 }
1933
1934 size = vma->vm_end - vma->vm_start;
1935 if (size > async->prealloc_bufsz) {
1936 retval = -EFAULT;
1937 goto done;
1938 }
1939 if (size & (~PAGE_MASK)) {
1940 retval = -EFAULT;
1941 goto done;
1942 }
1943
1944 n_pages = size >> PAGE_SHIFT;
1945 for (i = 0; i < n_pages; ++i) {
1946 struct comedi_buf_page *buf = &async->buf_page_list[i];
1947
1948 if (remap_pfn_range(vma, start,
1949 page_to_pfn(virt_to_page(buf->virt_addr)),
1950 PAGE_SIZE, PAGE_SHARED)) {
1951 retval = -EAGAIN;
1952 goto done;
1953 }
1954 start += PAGE_SIZE;
1955 }
1956
1957 vma->vm_ops = &comedi_vm_ops;
1958 vma->vm_private_data = async;
1959
1960 async->mmap_count++;
1961
1962 retval = 0;
1963 done:
1964 mutex_unlock(&dev->mutex);
1965 return retval;
1966 }
1967
1968 static unsigned int comedi_poll(struct file *file, poll_table *wait)
1969 {
1970 unsigned int mask = 0;
1971 const unsigned minor = iminor(file_inode(file));
1972 struct comedi_device *dev = comedi_dev_from_minor(minor);
1973 struct comedi_subdevice *s;
1974
1975 if (!dev)
1976 return -ENODEV;
1977
1978 mutex_lock(&dev->mutex);
1979
1980 if (!dev->attached) {
1981 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1982 goto done;
1983 }
1984
1985 s = comedi_read_subdevice(dev, minor);
1986 if (s && s->async) {
1987 poll_wait(file, &s->async->wait_head, wait);
1988 if (!s->busy || !comedi_is_subdevice_running(s) ||
1989 comedi_buf_read_n_available(s->async) > 0)
1990 mask |= POLLIN | POLLRDNORM;
1991 }
1992
1993 s = comedi_write_subdevice(dev, minor);
1994 if (s && s->async) {
1995 unsigned int bps = bytes_per_sample(s->async->subdevice);
1996
1997 poll_wait(file, &s->async->wait_head, wait);
1998 comedi_buf_write_alloc(s->async, s->async->prealloc_bufsz);
1999 if (!s->busy || !comedi_is_subdevice_running(s) ||
2000 comedi_buf_write_n_allocated(s->async) >= bps)
2001 mask |= POLLOUT | POLLWRNORM;
2002 }
2003
2004 done:
2005 mutex_unlock(&dev->mutex);
2006 return mask;
2007 }
2008
2009 static ssize_t comedi_write(struct file *file, const char __user *buf,
2010 size_t nbytes, loff_t *offset)
2011 {
2012 struct comedi_subdevice *s;
2013 struct comedi_async *async;
2014 int n, m, count = 0, retval = 0;
2015 DECLARE_WAITQUEUE(wait, current);
2016 const unsigned minor = iminor(file_inode(file));
2017 struct comedi_device *dev = comedi_dev_from_minor(minor);
2018
2019 if (!dev)
2020 return -ENODEV;
2021
2022 if (!dev->attached) {
2023 DPRINTK("no driver configured on comedi%i\n", dev->minor);
2024 return -ENODEV;
2025 }
2026
2027 s = comedi_write_subdevice(dev, minor);
2028 if (!s || !s->async)
2029 return -EIO;
2030
2031 async = s->async;
2032
2033 if (!s->busy || !nbytes)
2034 return 0;
2035 if (s->busy != file)
2036 return -EACCES;
2037
2038 add_wait_queue(&async->wait_head, &wait);
2039 while (nbytes > 0 && !retval) {
2040 set_current_state(TASK_INTERRUPTIBLE);
2041
2042 if (!comedi_is_subdevice_running(s)) {
2043 if (count == 0) {
2044 if (comedi_is_subdevice_in_error(s))
2045 retval = -EPIPE;
2046 else
2047 retval = 0;
2048 do_become_nonbusy(dev, s);
2049 }
2050 break;
2051 }
2052
2053 n = nbytes;
2054
2055 m = n;
2056 if (async->buf_write_ptr + m > async->prealloc_bufsz)
2057 m = async->prealloc_bufsz - async->buf_write_ptr;
2058 comedi_buf_write_alloc(async, async->prealloc_bufsz);
2059 if (m > comedi_buf_write_n_allocated(async))
2060 m = comedi_buf_write_n_allocated(async);
2061 if (m < n)
2062 n = m;
2063
2064 if (n == 0) {
2065 if (file->f_flags & O_NONBLOCK) {
2066 retval = -EAGAIN;
2067 break;
2068 }
2069 schedule();
2070 if (signal_pending(current)) {
2071 retval = -ERESTARTSYS;
2072 break;
2073 }
2074 if (!s->busy)
2075 break;
2076 if (s->busy != file) {
2077 retval = -EACCES;
2078 break;
2079 }
2080 continue;
2081 }
2082
2083 m = copy_from_user(async->prealloc_buf + async->buf_write_ptr,
2084 buf, n);
2085 if (m) {
2086 n -= m;
2087 retval = -EFAULT;
2088 }
2089 comedi_buf_write_free(async, n);
2090
2091 count += n;
2092 nbytes -= n;
2093
2094 buf += n;
2095 break; /* makes device work like a pipe */
2096 }
2097 set_current_state(TASK_RUNNING);
2098 remove_wait_queue(&async->wait_head, &wait);
2099
2100 return count ? count : retval;
2101 }
2102
2103 static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes,
2104 loff_t *offset)
2105 {
2106 struct comedi_subdevice *s;
2107 struct comedi_async *async;
2108 int n, m, count = 0, retval = 0;
2109 DECLARE_WAITQUEUE(wait, current);
2110 const unsigned minor = iminor(file_inode(file));
2111 struct comedi_device *dev = comedi_dev_from_minor(minor);
2112
2113 if (!dev)
2114 return -ENODEV;
2115
2116 if (!dev->attached) {
2117 DPRINTK("no driver configured on comedi%i\n", dev->minor);
2118 return -ENODEV;
2119 }
2120
2121 s = comedi_read_subdevice(dev, minor);
2122 if (!s || !s->async)
2123 return -EIO;
2124
2125 async = s->async;
2126 if (!s->busy || !nbytes)
2127 return 0;
2128 if (s->busy != file)
2129 return -EACCES;
2130
2131 add_wait_queue(&async->wait_head, &wait);
2132 while (nbytes > 0 && !retval) {
2133 set_current_state(TASK_INTERRUPTIBLE);
2134
2135 n = nbytes;
2136
2137 m = comedi_buf_read_n_available(async);
2138 /* printk("%d available\n",m); */
2139 if (async->buf_read_ptr + m > async->prealloc_bufsz)
2140 m = async->prealloc_bufsz - async->buf_read_ptr;
2141 /* printk("%d contiguous\n",m); */
2142 if (m < n)
2143 n = m;
2144
2145 if (n == 0) {
2146 if (!comedi_is_subdevice_running(s)) {
2147 do_become_nonbusy(dev, s);
2148 if (comedi_is_subdevice_in_error(s))
2149 retval = -EPIPE;
2150 else
2151 retval = 0;
2152 break;
2153 }
2154 if (file->f_flags & O_NONBLOCK) {
2155 retval = -EAGAIN;
2156 break;
2157 }
2158 schedule();
2159 if (signal_pending(current)) {
2160 retval = -ERESTARTSYS;
2161 break;
2162 }
2163 if (!s->busy) {
2164 retval = 0;
2165 break;
2166 }
2167 if (s->busy != file) {
2168 retval = -EACCES;
2169 break;
2170 }
2171 continue;
2172 }
2173 m = copy_to_user(buf, async->prealloc_buf +
2174 async->buf_read_ptr, n);
2175 if (m) {
2176 n -= m;
2177 retval = -EFAULT;
2178 }
2179
2180 comedi_buf_read_alloc(async, n);
2181 comedi_buf_read_free(async, n);
2182
2183 count += n;
2184 nbytes -= n;
2185
2186 buf += n;
2187 break; /* makes device work like a pipe */
2188 }
2189 if (comedi_is_subdevice_idle(s) &&
2190 async->buf_read_count - async->buf_write_count == 0) {
2191 do_become_nonbusy(dev, s);
2192 }
2193 set_current_state(TASK_RUNNING);
2194 remove_wait_queue(&async->wait_head, &wait);
2195
2196 return count ? count : retval;
2197 }
2198
2199 static int comedi_open(struct inode *inode, struct file *file)
2200 {
2201 const unsigned minor = iminor(inode);
2202 struct comedi_device *dev = comedi_dev_from_minor(minor);
2203
2204 if (!dev) {
2205 DPRINTK("invalid minor number\n");
2206 return -ENODEV;
2207 }
2208
2209 /* This is slightly hacky, but we want module autoloading
2210 * to work for root.
2211 * case: user opens device, attached -> ok
2212 * case: user opens device, unattached, !in_request_module -> autoload
2213 * case: user opens device, unattached, in_request_module -> fail
2214 * case: root opens device, attached -> ok
2215 * case: root opens device, unattached, in_request_module -> ok
2216 * (typically called from modprobe)
2217 * case: root opens device, unattached, !in_request_module -> autoload
2218 *
2219 * The last could be changed to "-> ok", which would deny root
2220 * autoloading.
2221 */
2222 mutex_lock(&dev->mutex);
2223 if (dev->attached)
2224 goto ok;
2225 if (!capable(CAP_NET_ADMIN) && dev->in_request_module) {
2226 DPRINTK("in request module\n");
2227 mutex_unlock(&dev->mutex);
2228 return -ENODEV;
2229 }
2230 if (capable(CAP_NET_ADMIN) && dev->in_request_module)
2231 goto ok;
2232
2233 dev->in_request_module = true;
2234
2235 #ifdef CONFIG_KMOD
2236 mutex_unlock(&dev->mutex);
2237 request_module("char-major-%i-%i", COMEDI_MAJOR, dev->minor);
2238 mutex_lock(&dev->mutex);
2239 #endif
2240
2241 dev->in_request_module = false;
2242
2243 if (!dev->attached && !capable(CAP_NET_ADMIN)) {
2244 DPRINTK("not attached and not CAP_NET_ADMIN\n");
2245 mutex_unlock(&dev->mutex);
2246 return -ENODEV;
2247 }
2248 ok:
2249 __module_get(THIS_MODULE);
2250
2251 if (dev->attached) {
2252 if (!try_module_get(dev->driver->module)) {
2253 module_put(THIS_MODULE);
2254 mutex_unlock(&dev->mutex);
2255 return -ENOSYS;
2256 }
2257 }
2258
2259 if (dev->attached && dev->use_count == 0 && dev->open) {
2260 int rc = dev->open(dev);
2261 if (rc < 0) {
2262 module_put(dev->driver->module);
2263 module_put(THIS_MODULE);
2264 mutex_unlock(&dev->mutex);
2265 return rc;
2266 }
2267 }
2268
2269 dev->use_count++;
2270
2271 mutex_unlock(&dev->mutex);
2272
2273 return 0;
2274 }
2275
2276 static int comedi_fasync(int fd, struct file *file, int on)
2277 {
2278 const unsigned minor = iminor(file_inode(file));
2279 struct comedi_device *dev = comedi_dev_from_minor(minor);
2280
2281 if (!dev)
2282 return -ENODEV;
2283
2284 return fasync_helper(fd, file, on, &dev->async_queue);
2285 }
2286
2287 static int comedi_close(struct inode *inode, struct file *file)
2288 {
2289 const unsigned minor = iminor(inode);
2290 struct comedi_device *dev = comedi_dev_from_minor(minor);
2291 struct comedi_subdevice *s = NULL;
2292 int i;
2293
2294 if (!dev)
2295 return -ENODEV;
2296
2297 mutex_lock(&dev->mutex);
2298
2299 if (dev->subdevices) {
2300 for (i = 0; i < dev->n_subdevices; i++) {
2301 s = &dev->subdevices[i];
2302
2303 if (s->busy == file)
2304 do_cancel(dev, s);
2305 if (s->lock == file)
2306 s->lock = NULL;
2307 }
2308 }
2309 if (dev->attached && dev->use_count == 1 && dev->close)
2310 dev->close(dev);
2311
2312 module_put(THIS_MODULE);
2313 if (dev->attached)
2314 module_put(dev->driver->module);
2315
2316 dev->use_count--;
2317
2318 mutex_unlock(&dev->mutex);
2319
2320 if (file->f_flags & FASYNC)
2321 comedi_fasync(-1, file, 0);
2322
2323 return 0;
2324 }
2325
2326 static const struct file_operations comedi_fops = {
2327 .owner = THIS_MODULE,
2328 .unlocked_ioctl = comedi_unlocked_ioctl,
2329 .compat_ioctl = comedi_compat_ioctl,
2330 .open = comedi_open,
2331 .release = comedi_close,
2332 .read = comedi_read,
2333 .write = comedi_write,
2334 .mmap = comedi_mmap,
2335 .poll = comedi_poll,
2336 .fasync = comedi_fasync,
2337 .llseek = noop_llseek,
2338 };
2339
2340 void comedi_error(const struct comedi_device *dev, const char *s)
2341 {
2342 dev_err(dev->class_dev, "%s: %s\n", dev->driver->driver_name, s);
2343 }
2344 EXPORT_SYMBOL_GPL(comedi_error);
2345
2346 void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s)
2347 {
2348 struct comedi_async *async = s->async;
2349 unsigned runflags = 0;
2350 unsigned runflags_mask = 0;
2351
2352 /* DPRINTK("comedi_event 0x%x\n",mask); */
2353
2354 if (!comedi_is_subdevice_running(s))
2355 return;
2356
2357 if (s->
2358 async->events & (COMEDI_CB_EOA | COMEDI_CB_ERROR |
2359 COMEDI_CB_OVERFLOW)) {
2360 runflags_mask |= SRF_RUNNING;
2361 }
2362 /* remember if an error event has occurred, so an error
2363 * can be returned the next time the user does a read() */
2364 if (s->async->events & (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) {
2365 runflags_mask |= SRF_ERROR;
2366 runflags |= SRF_ERROR;
2367 }
2368 if (runflags_mask) {
2369 /*sets SRF_ERROR and SRF_RUNNING together atomically */
2370 comedi_set_subdevice_runflags(s, runflags_mask, runflags);
2371 }
2372
2373 if (async->cb_mask & s->async->events) {
2374 if (comedi_get_subdevice_runflags(s) & SRF_USER) {
2375 wake_up_interruptible(&async->wait_head);
2376 if (s->subdev_flags & SDF_CMD_READ)
2377 kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
2378 if (s->subdev_flags & SDF_CMD_WRITE)
2379 kill_fasync(&dev->async_queue, SIGIO, POLL_OUT);
2380 } else {
2381 if (async->cb_func)
2382 async->cb_func(s->async->events, async->cb_arg);
2383 }
2384 }
2385 s->async->events = 0;
2386 }
2387 EXPORT_SYMBOL_GPL(comedi_event);
2388
2389 /* Note: the ->mutex is pre-locked on successful return */
2390 struct comedi_device *comedi_alloc_board_minor(struct device *hardware_device)
2391 {
2392 struct comedi_device *dev;
2393 struct device *csdev;
2394 unsigned i;
2395
2396 dev = kzalloc(sizeof(struct comedi_device), GFP_KERNEL);
2397 if (dev == NULL)
2398 return ERR_PTR(-ENOMEM);
2399 comedi_device_init(dev);
2400 comedi_set_hw_dev(dev, hardware_device);
2401 mutex_lock(&dev->mutex);
2402 mutex_lock(&comedi_board_minor_table_lock);
2403 for (i = hardware_device ? comedi_num_legacy_minors : 0;
2404 i < COMEDI_NUM_BOARD_MINORS; ++i) {
2405 if (comedi_board_minor_table[i] == NULL) {
2406 comedi_board_minor_table[i] = dev;
2407 break;
2408 }
2409 }
2410 mutex_unlock(&comedi_board_minor_table_lock);
2411 if (i == COMEDI_NUM_BOARD_MINORS) {
2412 mutex_unlock(&dev->mutex);
2413 comedi_device_cleanup(dev);
2414 kfree(dev);
2415 pr_err("comedi: error: ran out of minor numbers for board device files.\n");
2416 return ERR_PTR(-EBUSY);
2417 }
2418 dev->minor = i;
2419 csdev = device_create(comedi_class, hardware_device,
2420 MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i", i);
2421 if (!IS_ERR(csdev))
2422 dev->class_dev = csdev;
2423
2424 /* Note: dev->mutex needs to be unlocked by the caller. */
2425 return dev;
2426 }
2427
2428 static void comedi_free_board_minor(unsigned minor)
2429 {
2430 BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS);
2431 comedi_free_board_dev(comedi_clear_board_minor(minor));
2432 }
2433
2434 void comedi_release_hardware_device(struct device *hardware_device)
2435 {
2436 int minor;
2437 struct comedi_device *dev;
2438
2439 for (minor = comedi_num_legacy_minors; minor < COMEDI_NUM_BOARD_MINORS;
2440 minor++) {
2441 mutex_lock(&comedi_board_minor_table_lock);
2442 dev = comedi_board_minor_table[minor];
2443 if (dev && dev->hw_dev == hardware_device) {
2444 comedi_board_minor_table[minor] = NULL;
2445 mutex_unlock(&comedi_board_minor_table_lock);
2446 comedi_free_board_dev(dev);
2447 break;
2448 }
2449 mutex_unlock(&comedi_board_minor_table_lock);
2450 }
2451 }
2452
2453 int comedi_alloc_subdevice_minor(struct comedi_subdevice *s)
2454 {
2455 struct comedi_device *dev = s->device;
2456 struct device *csdev;
2457 unsigned i;
2458
2459 mutex_lock(&comedi_subdevice_minor_table_lock);
2460 for (i = 0; i < COMEDI_NUM_SUBDEVICE_MINORS; ++i) {
2461 if (comedi_subdevice_minor_table[i] == NULL) {
2462 comedi_subdevice_minor_table[i] = s;
2463 break;
2464 }
2465 }
2466 mutex_unlock(&comedi_subdevice_minor_table_lock);
2467 if (i == COMEDI_NUM_SUBDEVICE_MINORS) {
2468 pr_err("comedi: error: ran out of minor numbers for subdevice files.\n");
2469 return -EBUSY;
2470 }
2471 i += COMEDI_NUM_BOARD_MINORS;
2472 s->minor = i;
2473 csdev = device_create(comedi_class, dev->class_dev,
2474 MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i_subd%i",
2475 dev->minor, s->index);
2476 if (!IS_ERR(csdev))
2477 s->class_dev = csdev;
2478
2479 return 0;
2480 }
2481
2482 void comedi_free_subdevice_minor(struct comedi_subdevice *s)
2483 {
2484 unsigned int i;
2485
2486 if (s == NULL)
2487 return;
2488 if (s->minor < 0)
2489 return;
2490
2491 BUG_ON(s->minor >= COMEDI_NUM_MINORS);
2492 BUG_ON(s->minor < COMEDI_NUM_BOARD_MINORS);
2493
2494 i = s->minor - COMEDI_NUM_BOARD_MINORS;
2495 mutex_lock(&comedi_subdevice_minor_table_lock);
2496 if (s == comedi_subdevice_minor_table[i])
2497 comedi_subdevice_minor_table[i] = NULL;
2498 mutex_unlock(&comedi_subdevice_minor_table_lock);
2499 if (s->class_dev) {
2500 device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor));
2501 s->class_dev = NULL;
2502 }
2503 }
2504
2505 static void comedi_cleanup_board_minors(void)
2506 {
2507 unsigned i;
2508
2509 for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++)
2510 comedi_free_board_minor(i);
2511 }
2512
2513 static int __init comedi_init(void)
2514 {
2515 int i;
2516 int retval;
2517
2518 pr_info("comedi: version " COMEDI_RELEASE " - http://www.comedi.org\n");
2519
2520 if (comedi_num_legacy_minors < 0 ||
2521 comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) {
2522 pr_err("comedi: error: invalid value for module parameter \"comedi_num_legacy_minors\". Valid values are 0 through %i.\n",
2523 COMEDI_NUM_BOARD_MINORS);
2524 return -EINVAL;
2525 }
2526
2527 retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2528 COMEDI_NUM_MINORS, "comedi");
2529 if (retval)
2530 return -EIO;
2531 cdev_init(&comedi_cdev, &comedi_fops);
2532 comedi_cdev.owner = THIS_MODULE;
2533 kobject_set_name(&comedi_cdev.kobj, "comedi");
2534 if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) {
2535 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2536 COMEDI_NUM_MINORS);
2537 return -EIO;
2538 }
2539 comedi_class = class_create(THIS_MODULE, "comedi");
2540 if (IS_ERR(comedi_class)) {
2541 pr_err("comedi: failed to create class\n");
2542 cdev_del(&comedi_cdev);
2543 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2544 COMEDI_NUM_MINORS);
2545 return PTR_ERR(comedi_class);
2546 }
2547
2548 comedi_class->dev_attrs = comedi_dev_attrs;
2549
2550 /* XXX requires /proc interface */
2551 comedi_proc_init();
2552
2553 /* create devices files for legacy/manual use */
2554 for (i = 0; i < comedi_num_legacy_minors; i++) {
2555 struct comedi_device *dev;
2556 dev = comedi_alloc_board_minor(NULL);
2557 if (IS_ERR(dev)) {
2558 comedi_cleanup_board_minors();
2559 cdev_del(&comedi_cdev);
2560 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2561 COMEDI_NUM_MINORS);
2562 return PTR_ERR(dev);
2563 } else {
2564 /* comedi_alloc_board_minor() locked the mutex */
2565 mutex_unlock(&dev->mutex);
2566 }
2567 }
2568
2569 return 0;
2570 }
2571 module_init(comedi_init);
2572
2573 static void __exit comedi_cleanup(void)
2574 {
2575 int i;
2576
2577 comedi_cleanup_board_minors();
2578 for (i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i)
2579 BUG_ON(comedi_board_minor_table[i]);
2580 for (i = 0; i < COMEDI_NUM_SUBDEVICE_MINORS; ++i)
2581 BUG_ON(comedi_subdevice_minor_table[i]);
2582
2583 class_destroy(comedi_class);
2584 cdev_del(&comedi_cdev);
2585 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS);
2586
2587 comedi_proc_cleanup();
2588 }
2589 module_exit(comedi_cleanup);
2590
2591 MODULE_AUTHOR("http://www.comedi.org");
2592 MODULE_DESCRIPTION("Comedi core module");
2593 MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)