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Merge remote-tracking branch 'spi/topic/rspi' into spi-pdata
[deliverable/linux.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
19 #undef DEBUG
20
21 #include "comedi_compat32.h"
22
23 #include <linux/module.h>
24 #include <linux/errno.h>
25 #include <linux/kernel.h>
26 #include <linux/sched.h>
27 #include <linux/fcntl.h>
28 #include <linux/delay.h>
29 #include <linux/ioport.h>
30 #include <linux/mm.h>
31 #include <linux/slab.h>
32 #include <linux/kmod.h>
33 #include <linux/poll.h>
34 #include <linux/init.h>
35 #include <linux/device.h>
36 #include <linux/vmalloc.h>
37 #include <linux/fs.h>
38 #include "comedidev.h"
39 #include <linux/cdev.h>
40 #include <linux/stat.h>
41
42 #include <linux/io.h>
43 #include <linux/uaccess.h>
44
45 #include "comedi_internal.h"
46
47 #define COMEDI_NUM_MINORS 0x100
48 #define COMEDI_NUM_SUBDEVICE_MINORS \
49 (COMEDI_NUM_MINORS - COMEDI_NUM_BOARD_MINORS)
50
51 #ifdef CONFIG_COMEDI_DEBUG
52 int comedi_debug;
53 EXPORT_SYMBOL_GPL(comedi_debug);
54 module_param(comedi_debug, int, S_IRUGO | S_IWUSR);
55 MODULE_PARM_DESC(comedi_debug,
56 "enable comedi core and driver debugging if non-zero (default 0)"
57 );
58 #endif
59
60 static int comedi_num_legacy_minors;
61 module_param(comedi_num_legacy_minors, int, S_IRUGO);
62 MODULE_PARM_DESC(comedi_num_legacy_minors,
63 "number of comedi minor devices to reserve for non-auto-configured devices (default 0)"
64 );
65
66 unsigned int comedi_default_buf_size_kb = CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB;
67 module_param(comedi_default_buf_size_kb, uint, S_IRUGO | S_IWUSR);
68 MODULE_PARM_DESC(comedi_default_buf_size_kb,
69 "default asynchronous buffer size in KiB (default "
70 __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB) ")");
71
72 unsigned int comedi_default_buf_maxsize_kb
73 = CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB;
74 module_param(comedi_default_buf_maxsize_kb, uint, S_IRUGO | S_IWUSR);
75 MODULE_PARM_DESC(comedi_default_buf_maxsize_kb,
76 "default maximum size of asynchronous buffer in KiB (default "
77 __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB) ")");
78
79 static DEFINE_MUTEX(comedi_board_minor_table_lock);
80 static struct comedi_device
81 *comedi_board_minor_table[COMEDI_NUM_BOARD_MINORS];
82
83 static DEFINE_MUTEX(comedi_subdevice_minor_table_lock);
84 /* Note: indexed by minor - COMEDI_NUM_BOARD_MINORS. */
85 static struct comedi_subdevice
86 *comedi_subdevice_minor_table[COMEDI_NUM_SUBDEVICE_MINORS];
87
88 static struct class *comedi_class;
89 static struct cdev comedi_cdev;
90
91 static void comedi_device_init(struct comedi_device *dev)
92 {
93 spin_lock_init(&dev->spinlock);
94 mutex_init(&dev->mutex);
95 dev->minor = -1;
96 }
97
98 static void comedi_device_cleanup(struct comedi_device *dev)
99 {
100 struct module *driver_module = NULL;
101
102 if (dev == NULL)
103 return;
104 mutex_lock(&dev->mutex);
105 if (dev->attached)
106 driver_module = dev->driver->module;
107 comedi_device_detach(dev);
108 while (dev->use_count > 0) {
109 if (driver_module)
110 module_put(driver_module);
111 module_put(THIS_MODULE);
112 dev->use_count--;
113 }
114 mutex_unlock(&dev->mutex);
115 mutex_destroy(&dev->mutex);
116 }
117
118 static bool comedi_clear_board_dev(struct comedi_device *dev)
119 {
120 unsigned int i = dev->minor;
121 bool cleared = false;
122
123 mutex_lock(&comedi_board_minor_table_lock);
124 if (dev == comedi_board_minor_table[i]) {
125 comedi_board_minor_table[i] = NULL;
126 cleared = true;
127 }
128 mutex_unlock(&comedi_board_minor_table_lock);
129 return cleared;
130 }
131
132 static struct comedi_device *comedi_clear_board_minor(unsigned minor)
133 {
134 struct comedi_device *dev;
135
136 mutex_lock(&comedi_board_minor_table_lock);
137 dev = comedi_board_minor_table[minor];
138 comedi_board_minor_table[minor] = NULL;
139 mutex_unlock(&comedi_board_minor_table_lock);
140 return dev;
141 }
142
143 static void comedi_free_board_dev(struct comedi_device *dev)
144 {
145 if (dev) {
146 if (dev->class_dev) {
147 device_destroy(comedi_class,
148 MKDEV(COMEDI_MAJOR, dev->minor));
149 }
150 comedi_device_cleanup(dev);
151 kfree(dev);
152 }
153 }
154
155 static struct comedi_subdevice
156 *comedi_subdevice_from_minor(unsigned minor)
157 {
158 struct comedi_subdevice *s;
159 unsigned int i = minor - COMEDI_NUM_BOARD_MINORS;
160
161 BUG_ON(i >= COMEDI_NUM_SUBDEVICE_MINORS);
162 mutex_lock(&comedi_subdevice_minor_table_lock);
163 s = comedi_subdevice_minor_table[i];
164 mutex_unlock(&comedi_subdevice_minor_table_lock);
165 return s;
166 }
167
168 static struct comedi_device *comedi_dev_from_board_minor(unsigned minor)
169 {
170 struct comedi_device *dev;
171
172 BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS);
173 mutex_lock(&comedi_board_minor_table_lock);
174 dev = comedi_board_minor_table[minor];
175 mutex_unlock(&comedi_board_minor_table_lock);
176 return dev;
177 }
178
179 static struct comedi_device *comedi_dev_from_subdevice_minor(unsigned minor)
180 {
181 struct comedi_subdevice *s;
182
183 s = comedi_subdevice_from_minor(minor);
184 return s ? s->device : NULL;
185 }
186
187 struct comedi_device *comedi_dev_from_minor(unsigned minor)
188 {
189 if (minor < COMEDI_NUM_BOARD_MINORS)
190 return comedi_dev_from_board_minor(minor);
191 else
192 return comedi_dev_from_subdevice_minor(minor);
193 }
194 EXPORT_SYMBOL_GPL(comedi_dev_from_minor);
195
196 static struct comedi_subdevice *
197 comedi_read_subdevice(const struct comedi_device *dev, unsigned int minor)
198 {
199 struct comedi_subdevice *s;
200
201 if (minor >= COMEDI_NUM_BOARD_MINORS) {
202 s = comedi_subdevice_from_minor(minor);
203 if (!s || s->device != dev)
204 return NULL;
205 if (s->subdev_flags & SDF_CMD_READ)
206 return s;
207 }
208 return dev->read_subdev;
209 }
210
211 static struct comedi_subdevice *
212 comedi_write_subdevice(const struct comedi_device *dev, unsigned int minor)
213 {
214 struct comedi_subdevice *s;
215
216 if (minor >= COMEDI_NUM_BOARD_MINORS) {
217 s = comedi_subdevice_from_minor(minor);
218 if (!s || s->device != dev)
219 return NULL;
220 if (s->subdev_flags & SDF_CMD_WRITE)
221 return s;
222 }
223 return dev->write_subdev;
224 }
225
226 static int resize_async_buffer(struct comedi_device *dev,
227 struct comedi_subdevice *s,
228 struct comedi_async *async, unsigned new_size)
229 {
230 int retval;
231
232 if (new_size > async->max_bufsize)
233 return -EPERM;
234
235 if (s->busy) {
236 DPRINTK("subdevice is busy, cannot resize buffer\n");
237 return -EBUSY;
238 }
239 if (async->mmap_count) {
240 DPRINTK("subdevice is mmapped, cannot resize buffer\n");
241 return -EBUSY;
242 }
243
244 /* make sure buffer is an integral number of pages
245 * (we round up) */
246 new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK;
247
248 retval = comedi_buf_alloc(dev, s, new_size);
249 if (retval < 0)
250 return retval;
251
252 if (s->buf_change) {
253 retval = s->buf_change(dev, s, new_size);
254 if (retval < 0)
255 return retval;
256 }
257
258 DPRINTK("comedi%i subd %d buffer resized to %i bytes\n",
259 dev->minor, s->index, async->prealloc_bufsz);
260 return 0;
261 }
262
263 /* sysfs attribute files */
264
265 static ssize_t show_max_read_buffer_kb(struct device *csdev,
266 struct device_attribute *attr, char *buf)
267 {
268 unsigned int minor = MINOR(csdev->devt);
269 struct comedi_device *dev;
270 struct comedi_subdevice *s;
271 unsigned int size = 0;
272
273 dev = comedi_dev_from_minor(minor);
274 if (!dev)
275 return -ENODEV;
276
277 mutex_lock(&dev->mutex);
278 s = comedi_read_subdevice(dev, minor);
279 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
280 size = s->async->max_bufsize / 1024;
281 mutex_unlock(&dev->mutex);
282
283 return snprintf(buf, PAGE_SIZE, "%i\n", size);
284 }
285
286 static ssize_t store_max_read_buffer_kb(struct device *csdev,
287 struct device_attribute *attr,
288 const char *buf, size_t count)
289 {
290 unsigned int minor = MINOR(csdev->devt);
291 struct comedi_device *dev;
292 struct comedi_subdevice *s;
293 unsigned int size;
294 int err;
295
296 err = kstrtouint(buf, 10, &size);
297 if (err)
298 return err;
299 if (size > (UINT_MAX / 1024))
300 return -EINVAL;
301 size *= 1024;
302
303 dev = comedi_dev_from_minor(minor);
304 if (!dev)
305 return -ENODEV;
306
307 mutex_lock(&dev->mutex);
308 s = comedi_read_subdevice(dev, minor);
309 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
310 s->async->max_bufsize = size;
311 else
312 err = -EINVAL;
313 mutex_unlock(&dev->mutex);
314
315 return err ? err : count;
316 }
317
318 static ssize_t show_read_buffer_kb(struct device *csdev,
319 struct device_attribute *attr, char *buf)
320 {
321 unsigned int minor = MINOR(csdev->devt);
322 struct comedi_device *dev;
323 struct comedi_subdevice *s;
324 unsigned int size = 0;
325
326 dev = comedi_dev_from_minor(minor);
327 if (!dev)
328 return -ENODEV;
329
330 mutex_lock(&dev->mutex);
331 s = comedi_read_subdevice(dev, minor);
332 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
333 size = s->async->prealloc_bufsz / 1024;
334 mutex_unlock(&dev->mutex);
335
336 return snprintf(buf, PAGE_SIZE, "%i\n", size);
337 }
338
339 static ssize_t store_read_buffer_kb(struct device *csdev,
340 struct device_attribute *attr,
341 const char *buf, size_t count)
342 {
343 unsigned int minor = MINOR(csdev->devt);
344 struct comedi_device *dev;
345 struct comedi_subdevice *s;
346 unsigned int size;
347 int err;
348
349 err = kstrtouint(buf, 10, &size);
350 if (err)
351 return err;
352 if (size > (UINT_MAX / 1024))
353 return -EINVAL;
354 size *= 1024;
355
356 dev = comedi_dev_from_minor(minor);
357 if (!dev)
358 return -ENODEV;
359
360 mutex_lock(&dev->mutex);
361 s = comedi_read_subdevice(dev, minor);
362 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
363 err = resize_async_buffer(dev, s, s->async, size);
364 else
365 err = -EINVAL;
366 mutex_unlock(&dev->mutex);
367
368 return err ? err : count;
369 }
370
371 static ssize_t show_max_write_buffer_kb(struct device *csdev,
372 struct device_attribute *attr,
373 char *buf)
374 {
375 unsigned int minor = MINOR(csdev->devt);
376 struct comedi_device *dev;
377 struct comedi_subdevice *s;
378 unsigned int size = 0;
379
380 dev = comedi_dev_from_minor(minor);
381 if (!dev)
382 return -ENODEV;
383
384 mutex_lock(&dev->mutex);
385 s = comedi_write_subdevice(dev, minor);
386 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
387 size = s->async->max_bufsize / 1024;
388 mutex_unlock(&dev->mutex);
389
390 return snprintf(buf, PAGE_SIZE, "%i\n", size);
391 }
392
393 static ssize_t store_max_write_buffer_kb(struct device *csdev,
394 struct device_attribute *attr,
395 const char *buf, size_t count)
396 {
397 unsigned int minor = MINOR(csdev->devt);
398 struct comedi_device *dev;
399 struct comedi_subdevice *s;
400 unsigned int size;
401 int err;
402
403 err = kstrtouint(buf, 10, &size);
404 if (err)
405 return err;
406 if (size > (UINT_MAX / 1024))
407 return -EINVAL;
408 size *= 1024;
409
410 dev = comedi_dev_from_minor(minor);
411 if (!dev)
412 return -ENODEV;
413
414 mutex_lock(&dev->mutex);
415 s = comedi_write_subdevice(dev, minor);
416 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
417 s->async->max_bufsize = size;
418 else
419 err = -EINVAL;
420 mutex_unlock(&dev->mutex);
421
422 return err ? err : count;
423 }
424
425 static ssize_t show_write_buffer_kb(struct device *csdev,
426 struct device_attribute *attr, char *buf)
427 {
428 unsigned int minor = MINOR(csdev->devt);
429 struct comedi_device *dev;
430 struct comedi_subdevice *s;
431 unsigned int size = 0;
432
433 dev = comedi_dev_from_minor(minor);
434 if (!dev)
435 return -ENODEV;
436
437 mutex_lock(&dev->mutex);
438 s = comedi_write_subdevice(dev, minor);
439 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
440 size = s->async->prealloc_bufsz / 1024;
441 mutex_unlock(&dev->mutex);
442
443 return snprintf(buf, PAGE_SIZE, "%i\n", size);
444 }
445
446 static ssize_t store_write_buffer_kb(struct device *csdev,
447 struct device_attribute *attr,
448 const char *buf, size_t count)
449 {
450 unsigned int minor = MINOR(csdev->devt);
451 struct comedi_device *dev;
452 struct comedi_subdevice *s;
453 unsigned int size;
454 int err;
455
456 err = kstrtouint(buf, 10, &size);
457 if (err)
458 return err;
459 if (size > (UINT_MAX / 1024))
460 return -EINVAL;
461 size *= 1024;
462
463 dev = comedi_dev_from_minor(minor);
464 if (!dev)
465 return -ENODEV;
466
467 mutex_lock(&dev->mutex);
468 s = comedi_write_subdevice(dev, minor);
469 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
470 err = resize_async_buffer(dev, s, s->async, size);
471 else
472 err = -EINVAL;
473 mutex_unlock(&dev->mutex);
474
475 return err ? err : count;
476 }
477
478 static struct device_attribute comedi_dev_attrs[] = {
479 __ATTR(max_read_buffer_kb, S_IRUGO | S_IWUSR,
480 show_max_read_buffer_kb, store_max_read_buffer_kb),
481 __ATTR(read_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP,
482 show_read_buffer_kb, store_read_buffer_kb),
483 __ATTR(max_write_buffer_kb, S_IRUGO | S_IWUSR,
484 show_max_write_buffer_kb, store_max_write_buffer_kb),
485 __ATTR(write_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP,
486 show_write_buffer_kb, store_write_buffer_kb),
487 __ATTR_NULL
488 };
489
490 static void comedi_set_subdevice_runflags(struct comedi_subdevice *s,
491 unsigned mask, unsigned bits)
492 {
493 unsigned long flags;
494
495 spin_lock_irqsave(&s->spin_lock, flags);
496 s->runflags &= ~mask;
497 s->runflags |= (bits & mask);
498 spin_unlock_irqrestore(&s->spin_lock, flags);
499 }
500
501 static unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s)
502 {
503 unsigned long flags;
504 unsigned runflags;
505
506 spin_lock_irqsave(&s->spin_lock, flags);
507 runflags = s->runflags;
508 spin_unlock_irqrestore(&s->spin_lock, flags);
509 return runflags;
510 }
511
512 bool comedi_is_subdevice_running(struct comedi_subdevice *s)
513 {
514 unsigned runflags = comedi_get_subdevice_runflags(s);
515
516 return (runflags & SRF_RUNNING) ? true : false;
517 }
518 EXPORT_SYMBOL_GPL(comedi_is_subdevice_running);
519
520 static bool comedi_is_subdevice_in_error(struct comedi_subdevice *s)
521 {
522 unsigned runflags = comedi_get_subdevice_runflags(s);
523
524 return (runflags & SRF_ERROR) ? true : false;
525 }
526
527 static bool comedi_is_subdevice_idle(struct comedi_subdevice *s)
528 {
529 unsigned runflags = comedi_get_subdevice_runflags(s);
530
531 return (runflags & (SRF_ERROR | SRF_RUNNING)) ? false : true;
532 }
533
534 /**
535 * comedi_alloc_spriv() - Allocate memory for the subdevice private data.
536 * @s: comedi_subdevice struct
537 * @size: size of the memory to allocate
538 *
539 * This also sets the subdevice runflags to allow the core to automatically
540 * free the private data during the detach.
541 */
542 void *comedi_alloc_spriv(struct comedi_subdevice *s, size_t size)
543 {
544 s->private = kzalloc(size, GFP_KERNEL);
545 if (s->private)
546 comedi_set_subdevice_runflags(s, ~0, SRF_FREE_SPRIV);
547 return s->private;
548 }
549 EXPORT_SYMBOL_GPL(comedi_alloc_spriv);
550
551 /*
552 This function restores a subdevice to an idle state.
553 */
554 static void do_become_nonbusy(struct comedi_device *dev,
555 struct comedi_subdevice *s)
556 {
557 struct comedi_async *async = s->async;
558
559 comedi_set_subdevice_runflags(s, SRF_RUNNING, 0);
560 if (async) {
561 comedi_buf_reset(async);
562 async->inttrig = NULL;
563 kfree(async->cmd.chanlist);
564 async->cmd.chanlist = NULL;
565 } else {
566 dev_err(dev->class_dev,
567 "BUG: (?) do_become_nonbusy called with async=NULL\n");
568 }
569
570 s->busy = NULL;
571 }
572
573 static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
574 {
575 int ret = 0;
576
577 if (comedi_is_subdevice_running(s) && s->cancel)
578 ret = s->cancel(dev, s);
579
580 do_become_nonbusy(dev, s);
581
582 return ret;
583 }
584
585 static int is_device_busy(struct comedi_device *dev)
586 {
587 struct comedi_subdevice *s;
588 int i;
589
590 if (!dev->attached)
591 return 0;
592
593 for (i = 0; i < dev->n_subdevices; i++) {
594 s = &dev->subdevices[i];
595 if (s->busy)
596 return 1;
597 if (s->async && s->async->mmap_count)
598 return 1;
599 }
600
601 return 0;
602 }
603
604 /*
605 COMEDI_DEVCONFIG
606 device config ioctl
607
608 arg:
609 pointer to devconfig structure
610
611 reads:
612 devconfig structure at arg
613
614 writes:
615 none
616 */
617 static int do_devconfig_ioctl(struct comedi_device *dev,
618 struct comedi_devconfig __user *arg)
619 {
620 struct comedi_devconfig it;
621
622 if (!capable(CAP_SYS_ADMIN))
623 return -EPERM;
624
625 if (arg == NULL) {
626 if (is_device_busy(dev))
627 return -EBUSY;
628 if (dev->attached) {
629 struct module *driver_module = dev->driver->module;
630 comedi_device_detach(dev);
631 module_put(driver_module);
632 }
633 return 0;
634 }
635
636 if (copy_from_user(&it, arg, sizeof(it)))
637 return -EFAULT;
638
639 it.board_name[COMEDI_NAMELEN - 1] = 0;
640
641 if (it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) {
642 dev_warn(dev->class_dev,
643 "comedi_config --init_data is deprecated\n");
644 return -EINVAL;
645 }
646
647 if (dev->minor >= comedi_num_legacy_minors)
648 /* don't re-use dynamically allocated comedi devices */
649 return -EBUSY;
650
651 /* This increments the driver module count on success. */
652 return comedi_device_attach(dev, &it);
653 }
654
655 /*
656 COMEDI_BUFCONFIG
657 buffer configuration ioctl
658
659 arg:
660 pointer to bufconfig structure
661
662 reads:
663 bufconfig at arg
664
665 writes:
666 modified bufconfig at arg
667
668 */
669 static int do_bufconfig_ioctl(struct comedi_device *dev,
670 struct comedi_bufconfig __user *arg)
671 {
672 struct comedi_bufconfig bc;
673 struct comedi_async *async;
674 struct comedi_subdevice *s;
675 int retval = 0;
676
677 if (copy_from_user(&bc, arg, sizeof(bc)))
678 return -EFAULT;
679
680 if (bc.subdevice >= dev->n_subdevices)
681 return -EINVAL;
682
683 s = &dev->subdevices[bc.subdevice];
684 async = s->async;
685
686 if (!async) {
687 DPRINTK("subdevice does not have async capability\n");
688 bc.size = 0;
689 bc.maximum_size = 0;
690 goto copyback;
691 }
692
693 if (bc.maximum_size) {
694 if (!capable(CAP_SYS_ADMIN))
695 return -EPERM;
696
697 async->max_bufsize = bc.maximum_size;
698 }
699
700 if (bc.size) {
701 retval = resize_async_buffer(dev, s, async, bc.size);
702 if (retval < 0)
703 return retval;
704 }
705
706 bc.size = async->prealloc_bufsz;
707 bc.maximum_size = async->max_bufsize;
708
709 copyback:
710 if (copy_to_user(arg, &bc, sizeof(bc)))
711 return -EFAULT;
712
713 return 0;
714 }
715
716 /*
717 COMEDI_DEVINFO
718 device info ioctl
719
720 arg:
721 pointer to devinfo structure
722
723 reads:
724 none
725
726 writes:
727 devinfo structure
728
729 */
730 static int do_devinfo_ioctl(struct comedi_device *dev,
731 struct comedi_devinfo __user *arg,
732 struct file *file)
733 {
734 const unsigned minor = iminor(file_inode(file));
735 struct comedi_subdevice *s;
736 struct comedi_devinfo devinfo;
737
738 memset(&devinfo, 0, sizeof(devinfo));
739
740 /* fill devinfo structure */
741 devinfo.version_code = COMEDI_VERSION_CODE;
742 devinfo.n_subdevs = dev->n_subdevices;
743 strlcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN);
744 strlcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN);
745
746 s = comedi_read_subdevice(dev, minor);
747 if (s)
748 devinfo.read_subdevice = s->index;
749 else
750 devinfo.read_subdevice = -1;
751
752 s = comedi_write_subdevice(dev, minor);
753 if (s)
754 devinfo.write_subdevice = s->index;
755 else
756 devinfo.write_subdevice = -1;
757
758 if (copy_to_user(arg, &devinfo, sizeof(devinfo)))
759 return -EFAULT;
760
761 return 0;
762 }
763
764 /*
765 COMEDI_SUBDINFO
766 subdevice info ioctl
767
768 arg:
769 pointer to array of subdevice info structures
770
771 reads:
772 none
773
774 writes:
775 array of subdevice info structures at arg
776
777 */
778 static int do_subdinfo_ioctl(struct comedi_device *dev,
779 struct comedi_subdinfo __user *arg, void *file)
780 {
781 int ret, i;
782 struct comedi_subdinfo *tmp, *us;
783 struct comedi_subdevice *s;
784
785 tmp = kcalloc(dev->n_subdevices, sizeof(*tmp), GFP_KERNEL);
786 if (!tmp)
787 return -ENOMEM;
788
789 /* fill subdinfo structs */
790 for (i = 0; i < dev->n_subdevices; i++) {
791 s = &dev->subdevices[i];
792 us = tmp + i;
793
794 us->type = s->type;
795 us->n_chan = s->n_chan;
796 us->subd_flags = s->subdev_flags;
797 if (comedi_is_subdevice_running(s))
798 us->subd_flags |= SDF_RUNNING;
799 #define TIMER_nanosec 5 /* backwards compatibility */
800 us->timer_type = TIMER_nanosec;
801 us->len_chanlist = s->len_chanlist;
802 us->maxdata = s->maxdata;
803 if (s->range_table) {
804 us->range_type =
805 (i << 24) | (0 << 16) | (s->range_table->length);
806 } else {
807 us->range_type = 0; /* XXX */
808 }
809 us->flags = s->flags;
810
811 if (s->busy)
812 us->subd_flags |= SDF_BUSY;
813 if (s->busy == file)
814 us->subd_flags |= SDF_BUSY_OWNER;
815 if (s->lock)
816 us->subd_flags |= SDF_LOCKED;
817 if (s->lock == file)
818 us->subd_flags |= SDF_LOCK_OWNER;
819 if (!s->maxdata && s->maxdata_list)
820 us->subd_flags |= SDF_MAXDATA;
821 if (s->flaglist)
822 us->subd_flags |= SDF_FLAGS;
823 if (s->range_table_list)
824 us->subd_flags |= SDF_RANGETYPE;
825 if (s->do_cmd)
826 us->subd_flags |= SDF_CMD;
827
828 if (s->insn_bits != &insn_inval)
829 us->insn_bits_support = COMEDI_SUPPORTED;
830 else
831 us->insn_bits_support = COMEDI_UNSUPPORTED;
832
833 us->settling_time_0 = s->settling_time_0;
834 }
835
836 ret = copy_to_user(arg, tmp, dev->n_subdevices * sizeof(*tmp));
837
838 kfree(tmp);
839
840 return ret ? -EFAULT : 0;
841 }
842
843 /*
844 COMEDI_CHANINFO
845 subdevice info ioctl
846
847 arg:
848 pointer to chaninfo structure
849
850 reads:
851 chaninfo structure at arg
852
853 writes:
854 arrays at elements of chaninfo structure
855
856 */
857 static int do_chaninfo_ioctl(struct comedi_device *dev,
858 struct comedi_chaninfo __user *arg)
859 {
860 struct comedi_subdevice *s;
861 struct comedi_chaninfo it;
862
863 if (copy_from_user(&it, arg, sizeof(it)))
864 return -EFAULT;
865
866 if (it.subdev >= dev->n_subdevices)
867 return -EINVAL;
868 s = &dev->subdevices[it.subdev];
869
870 if (it.maxdata_list) {
871 if (s->maxdata || !s->maxdata_list)
872 return -EINVAL;
873 if (copy_to_user(it.maxdata_list, s->maxdata_list,
874 s->n_chan * sizeof(unsigned int)))
875 return -EFAULT;
876 }
877
878 if (it.flaglist) {
879 if (!s->flaglist)
880 return -EINVAL;
881 if (copy_to_user(it.flaglist, s->flaglist,
882 s->n_chan * sizeof(unsigned int)))
883 return -EFAULT;
884 }
885
886 if (it.rangelist) {
887 int i;
888
889 if (!s->range_table_list)
890 return -EINVAL;
891 for (i = 0; i < s->n_chan; i++) {
892 int x;
893
894 x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) |
895 (s->range_table_list[i]->length);
896 if (put_user(x, it.rangelist + i))
897 return -EFAULT;
898 }
899 #if 0
900 if (copy_to_user(it.rangelist, s->range_type_list,
901 s->n_chan * sizeof(unsigned int)))
902 return -EFAULT;
903 #endif
904 }
905
906 return 0;
907 }
908
909 /*
910 COMEDI_BUFINFO
911 buffer information ioctl
912
913 arg:
914 pointer to bufinfo structure
915
916 reads:
917 bufinfo at arg
918
919 writes:
920 modified bufinfo at arg
921
922 */
923 static int do_bufinfo_ioctl(struct comedi_device *dev,
924 struct comedi_bufinfo __user *arg, void *file)
925 {
926 struct comedi_bufinfo bi;
927 struct comedi_subdevice *s;
928 struct comedi_async *async;
929
930 if (copy_from_user(&bi, arg, sizeof(bi)))
931 return -EFAULT;
932
933 if (bi.subdevice >= dev->n_subdevices)
934 return -EINVAL;
935
936 s = &dev->subdevices[bi.subdevice];
937
938 if (s->lock && s->lock != file)
939 return -EACCES;
940
941 async = s->async;
942
943 if (!async) {
944 DPRINTK("subdevice does not have async capability\n");
945 bi.buf_write_ptr = 0;
946 bi.buf_read_ptr = 0;
947 bi.buf_write_count = 0;
948 bi.buf_read_count = 0;
949 bi.bytes_read = 0;
950 bi.bytes_written = 0;
951 goto copyback;
952 }
953 if (!s->busy) {
954 bi.bytes_read = 0;
955 bi.bytes_written = 0;
956 goto copyback_position;
957 }
958 if (s->busy != file)
959 return -EACCES;
960
961 if (bi.bytes_read && (s->subdev_flags & SDF_CMD_READ)) {
962 bi.bytes_read = comedi_buf_read_alloc(async, bi.bytes_read);
963 comedi_buf_read_free(async, bi.bytes_read);
964
965 if (comedi_is_subdevice_idle(s) &&
966 async->buf_write_count == async->buf_read_count) {
967 do_become_nonbusy(dev, s);
968 }
969 }
970
971 if (bi.bytes_written && (s->subdev_flags & SDF_CMD_WRITE)) {
972 bi.bytes_written =
973 comedi_buf_write_alloc(async, bi.bytes_written);
974 comedi_buf_write_free(async, bi.bytes_written);
975 }
976
977 copyback_position:
978 bi.buf_write_count = async->buf_write_count;
979 bi.buf_write_ptr = async->buf_write_ptr;
980 bi.buf_read_count = async->buf_read_count;
981 bi.buf_read_ptr = async->buf_read_ptr;
982
983 copyback:
984 if (copy_to_user(arg, &bi, sizeof(bi)))
985 return -EFAULT;
986
987 return 0;
988 }
989
990 static int check_insn_config_length(struct comedi_insn *insn,
991 unsigned int *data)
992 {
993 if (insn->n < 1)
994 return -EINVAL;
995
996 switch (data[0]) {
997 case INSN_CONFIG_DIO_OUTPUT:
998 case INSN_CONFIG_DIO_INPUT:
999 case INSN_CONFIG_DISARM:
1000 case INSN_CONFIG_RESET:
1001 if (insn->n == 1)
1002 return 0;
1003 break;
1004 case INSN_CONFIG_ARM:
1005 case INSN_CONFIG_DIO_QUERY:
1006 case INSN_CONFIG_BLOCK_SIZE:
1007 case INSN_CONFIG_FILTER:
1008 case INSN_CONFIG_SERIAL_CLOCK:
1009 case INSN_CONFIG_BIDIRECTIONAL_DATA:
1010 case INSN_CONFIG_ALT_SOURCE:
1011 case INSN_CONFIG_SET_COUNTER_MODE:
1012 case INSN_CONFIG_8254_READ_STATUS:
1013 case INSN_CONFIG_SET_ROUTING:
1014 case INSN_CONFIG_GET_ROUTING:
1015 case INSN_CONFIG_GET_PWM_STATUS:
1016 case INSN_CONFIG_PWM_SET_PERIOD:
1017 case INSN_CONFIG_PWM_GET_PERIOD:
1018 if (insn->n == 2)
1019 return 0;
1020 break;
1021 case INSN_CONFIG_SET_GATE_SRC:
1022 case INSN_CONFIG_GET_GATE_SRC:
1023 case INSN_CONFIG_SET_CLOCK_SRC:
1024 case INSN_CONFIG_GET_CLOCK_SRC:
1025 case INSN_CONFIG_SET_OTHER_SRC:
1026 case INSN_CONFIG_GET_COUNTER_STATUS:
1027 case INSN_CONFIG_PWM_SET_H_BRIDGE:
1028 case INSN_CONFIG_PWM_GET_H_BRIDGE:
1029 case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE:
1030 if (insn->n == 3)
1031 return 0;
1032 break;
1033 case INSN_CONFIG_PWM_OUTPUT:
1034 case INSN_CONFIG_ANALOG_TRIG:
1035 if (insn->n == 5)
1036 return 0;
1037 break;
1038 case INSN_CONFIG_DIGITAL_TRIG:
1039 if (insn->n == 6)
1040 return 0;
1041 break;
1042 /* by default we allow the insn since we don't have checks for
1043 * all possible cases yet */
1044 default:
1045 pr_warn("comedi: No check for data length of config insn id %i is implemented.\n",
1046 data[0]);
1047 pr_warn("comedi: Add a check to %s in %s.\n",
1048 __func__, __FILE__);
1049 pr_warn("comedi: Assuming n=%i is correct.\n", insn->n);
1050 return 0;
1051 }
1052 return -EINVAL;
1053 }
1054
1055 static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn,
1056 unsigned int *data, void *file)
1057 {
1058 struct comedi_subdevice *s;
1059 int ret = 0;
1060 int i;
1061
1062 if (insn->insn & INSN_MASK_SPECIAL) {
1063 /* a non-subdevice instruction */
1064
1065 switch (insn->insn) {
1066 case INSN_GTOD:
1067 {
1068 struct timeval tv;
1069
1070 if (insn->n != 2) {
1071 ret = -EINVAL;
1072 break;
1073 }
1074
1075 do_gettimeofday(&tv);
1076 data[0] = tv.tv_sec;
1077 data[1] = tv.tv_usec;
1078 ret = 2;
1079
1080 break;
1081 }
1082 case INSN_WAIT:
1083 if (insn->n != 1 || data[0] >= 100000) {
1084 ret = -EINVAL;
1085 break;
1086 }
1087 udelay(data[0] / 1000);
1088 ret = 1;
1089 break;
1090 case INSN_INTTRIG:
1091 if (insn->n != 1) {
1092 ret = -EINVAL;
1093 break;
1094 }
1095 if (insn->subdev >= dev->n_subdevices) {
1096 DPRINTK("%d not usable subdevice\n",
1097 insn->subdev);
1098 ret = -EINVAL;
1099 break;
1100 }
1101 s = &dev->subdevices[insn->subdev];
1102 if (!s->async) {
1103 DPRINTK("no async\n");
1104 ret = -EINVAL;
1105 break;
1106 }
1107 if (!s->async->inttrig) {
1108 DPRINTK("no inttrig\n");
1109 ret = -EAGAIN;
1110 break;
1111 }
1112 ret = s->async->inttrig(dev, s, data[0]);
1113 if (ret >= 0)
1114 ret = 1;
1115 break;
1116 default:
1117 DPRINTK("invalid insn\n");
1118 ret = -EINVAL;
1119 break;
1120 }
1121 } else {
1122 /* a subdevice instruction */
1123 unsigned int maxdata;
1124
1125 if (insn->subdev >= dev->n_subdevices) {
1126 DPRINTK("subdevice %d out of range\n", insn->subdev);
1127 ret = -EINVAL;
1128 goto out;
1129 }
1130 s = &dev->subdevices[insn->subdev];
1131
1132 if (s->type == COMEDI_SUBD_UNUSED) {
1133 DPRINTK("%d not usable subdevice\n", insn->subdev);
1134 ret = -EIO;
1135 goto out;
1136 }
1137
1138 /* are we locked? (ioctl lock) */
1139 if (s->lock && s->lock != file) {
1140 DPRINTK("device locked\n");
1141 ret = -EACCES;
1142 goto out;
1143 }
1144
1145 ret = comedi_check_chanlist(s, 1, &insn->chanspec);
1146 if (ret < 0) {
1147 ret = -EINVAL;
1148 DPRINTK("bad chanspec\n");
1149 goto out;
1150 }
1151
1152 if (s->busy) {
1153 ret = -EBUSY;
1154 goto out;
1155 }
1156 /* This looks arbitrary. It is. */
1157 s->busy = &parse_insn;
1158 switch (insn->insn) {
1159 case INSN_READ:
1160 ret = s->insn_read(dev, s, insn, data);
1161 break;
1162 case INSN_WRITE:
1163 maxdata = s->maxdata_list
1164 ? s->maxdata_list[CR_CHAN(insn->chanspec)]
1165 : s->maxdata;
1166 for (i = 0; i < insn->n; ++i) {
1167 if (data[i] > maxdata) {
1168 ret = -EINVAL;
1169 DPRINTK("bad data value(s)\n");
1170 break;
1171 }
1172 }
1173 if (ret == 0)
1174 ret = s->insn_write(dev, s, insn, data);
1175 break;
1176 case INSN_BITS:
1177 if (insn->n != 2) {
1178 ret = -EINVAL;
1179 } else {
1180 /* Most drivers ignore the base channel in
1181 * insn->chanspec. Fix this here if
1182 * the subdevice has <= 32 channels. */
1183 unsigned int shift;
1184 unsigned int orig_mask;
1185
1186 orig_mask = data[0];
1187 if (s->n_chan <= 32) {
1188 shift = CR_CHAN(insn->chanspec);
1189 if (shift > 0) {
1190 insn->chanspec = 0;
1191 data[0] <<= shift;
1192 data[1] <<= shift;
1193 }
1194 } else
1195 shift = 0;
1196 ret = s->insn_bits(dev, s, insn, data);
1197 data[0] = orig_mask;
1198 if (shift > 0)
1199 data[1] >>= shift;
1200 }
1201 break;
1202 case INSN_CONFIG:
1203 ret = check_insn_config_length(insn, data);
1204 if (ret)
1205 break;
1206 ret = s->insn_config(dev, s, insn, data);
1207 break;
1208 default:
1209 ret = -EINVAL;
1210 break;
1211 }
1212
1213 s->busy = NULL;
1214 }
1215
1216 out:
1217 return ret;
1218 }
1219
1220 /*
1221 * COMEDI_INSNLIST
1222 * synchronous instructions
1223 *
1224 * arg:
1225 * pointer to sync cmd structure
1226 *
1227 * reads:
1228 * sync cmd struct at arg
1229 * instruction list
1230 * data (for writes)
1231 *
1232 * writes:
1233 * data (for reads)
1234 */
1235 /* arbitrary limits */
1236 #define MAX_SAMPLES 256
1237 static int do_insnlist_ioctl(struct comedi_device *dev,
1238 struct comedi_insnlist __user *arg, void *file)
1239 {
1240 struct comedi_insnlist insnlist;
1241 struct comedi_insn *insns = NULL;
1242 unsigned int *data = NULL;
1243 int i = 0;
1244 int ret = 0;
1245
1246 if (copy_from_user(&insnlist, arg, sizeof(insnlist)))
1247 return -EFAULT;
1248
1249 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL);
1250 if (!data) {
1251 DPRINTK("kmalloc failed\n");
1252 ret = -ENOMEM;
1253 goto error;
1254 }
1255
1256 insns = kcalloc(insnlist.n_insns, sizeof(*insns), GFP_KERNEL);
1257 if (!insns) {
1258 DPRINTK("kmalloc failed\n");
1259 ret = -ENOMEM;
1260 goto error;
1261 }
1262
1263 if (copy_from_user(insns, insnlist.insns,
1264 sizeof(*insns) * insnlist.n_insns)) {
1265 DPRINTK("copy_from_user failed\n");
1266 ret = -EFAULT;
1267 goto error;
1268 }
1269
1270 for (i = 0; i < insnlist.n_insns; i++) {
1271 if (insns[i].n > MAX_SAMPLES) {
1272 DPRINTK("number of samples too large\n");
1273 ret = -EINVAL;
1274 goto error;
1275 }
1276 if (insns[i].insn & INSN_MASK_WRITE) {
1277 if (copy_from_user(data, insns[i].data,
1278 insns[i].n * sizeof(unsigned int))) {
1279 DPRINTK("copy_from_user failed\n");
1280 ret = -EFAULT;
1281 goto error;
1282 }
1283 }
1284 ret = parse_insn(dev, insns + i, data, file);
1285 if (ret < 0)
1286 goto error;
1287 if (insns[i].insn & INSN_MASK_READ) {
1288 if (copy_to_user(insns[i].data, data,
1289 insns[i].n * sizeof(unsigned int))) {
1290 DPRINTK("copy_to_user failed\n");
1291 ret = -EFAULT;
1292 goto error;
1293 }
1294 }
1295 if (need_resched())
1296 schedule();
1297 }
1298
1299 error:
1300 kfree(insns);
1301 kfree(data);
1302
1303 if (ret < 0)
1304 return ret;
1305 return i;
1306 }
1307
1308 /*
1309 * COMEDI_INSN
1310 * synchronous instructions
1311 *
1312 * arg:
1313 * pointer to insn
1314 *
1315 * reads:
1316 * struct comedi_insn struct at arg
1317 * data (for writes)
1318 *
1319 * writes:
1320 * data (for reads)
1321 */
1322 static int do_insn_ioctl(struct comedi_device *dev,
1323 struct comedi_insn __user *arg, void *file)
1324 {
1325 struct comedi_insn insn;
1326 unsigned int *data = NULL;
1327 int ret = 0;
1328
1329 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL);
1330 if (!data) {
1331 ret = -ENOMEM;
1332 goto error;
1333 }
1334
1335 if (copy_from_user(&insn, arg, sizeof(insn))) {
1336 ret = -EFAULT;
1337 goto error;
1338 }
1339
1340 /* This is where the behavior of insn and insnlist deviate. */
1341 if (insn.n > MAX_SAMPLES)
1342 insn.n = MAX_SAMPLES;
1343 if (insn.insn & INSN_MASK_WRITE) {
1344 if (copy_from_user(data,
1345 insn.data,
1346 insn.n * sizeof(unsigned int))) {
1347 ret = -EFAULT;
1348 goto error;
1349 }
1350 }
1351 ret = parse_insn(dev, &insn, data, file);
1352 if (ret < 0)
1353 goto error;
1354 if (insn.insn & INSN_MASK_READ) {
1355 if (copy_to_user(insn.data,
1356 data,
1357 insn.n * sizeof(unsigned int))) {
1358 ret = -EFAULT;
1359 goto error;
1360 }
1361 }
1362 ret = insn.n;
1363
1364 error:
1365 kfree(data);
1366
1367 return ret;
1368 }
1369
1370 static int do_cmd_ioctl(struct comedi_device *dev,
1371 struct comedi_cmd __user *arg, void *file)
1372 {
1373 struct comedi_cmd cmd;
1374 struct comedi_subdevice *s;
1375 struct comedi_async *async;
1376 int ret = 0;
1377 unsigned int __user *user_chanlist;
1378
1379 if (copy_from_user(&cmd, arg, sizeof(cmd))) {
1380 DPRINTK("bad cmd address\n");
1381 return -EFAULT;
1382 }
1383 /* save user's chanlist pointer so it can be restored later */
1384 user_chanlist = (unsigned int __user *)cmd.chanlist;
1385
1386 if (cmd.subdev >= dev->n_subdevices) {
1387 DPRINTK("%d no such subdevice\n", cmd.subdev);
1388 return -ENODEV;
1389 }
1390
1391 s = &dev->subdevices[cmd.subdev];
1392 async = s->async;
1393
1394 if (s->type == COMEDI_SUBD_UNUSED) {
1395 DPRINTK("%d not valid subdevice\n", cmd.subdev);
1396 return -EIO;
1397 }
1398
1399 if (!s->do_cmd || !s->do_cmdtest || !s->async) {
1400 DPRINTK("subdevice %i does not support commands\n",
1401 cmd.subdev);
1402 return -EIO;
1403 }
1404
1405 /* are we locked? (ioctl lock) */
1406 if (s->lock && s->lock != file) {
1407 DPRINTK("subdevice locked\n");
1408 return -EACCES;
1409 }
1410
1411 /* are we busy? */
1412 if (s->busy) {
1413 DPRINTK("subdevice busy\n");
1414 return -EBUSY;
1415 }
1416
1417 /* make sure channel/gain list isn't too long */
1418 if (cmd.chanlist_len > s->len_chanlist) {
1419 DPRINTK("channel/gain list too long %u > %d\n",
1420 cmd.chanlist_len, s->len_chanlist);
1421 return -EINVAL;
1422 }
1423
1424 /* make sure channel/gain list isn't too short */
1425 if (cmd.chanlist_len < 1) {
1426 DPRINTK("channel/gain list too short %u < 1\n",
1427 cmd.chanlist_len);
1428 return -EINVAL;
1429 }
1430
1431 async->cmd = cmd;
1432 async->cmd.data = NULL;
1433 /* load channel/gain list */
1434 async->cmd.chanlist =
1435 kmalloc(async->cmd.chanlist_len * sizeof(int), GFP_KERNEL);
1436 if (!async->cmd.chanlist) {
1437 DPRINTK("allocation failed\n");
1438 return -ENOMEM;
1439 }
1440
1441 if (copy_from_user(async->cmd.chanlist, user_chanlist,
1442 async->cmd.chanlist_len * sizeof(int))) {
1443 DPRINTK("fault reading chanlist\n");
1444 ret = -EFAULT;
1445 goto cleanup;
1446 }
1447
1448 /* make sure each element in channel/gain list is valid */
1449 ret = comedi_check_chanlist(s,
1450 async->cmd.chanlist_len,
1451 async->cmd.chanlist);
1452 if (ret < 0) {
1453 DPRINTK("bad chanlist\n");
1454 goto cleanup;
1455 }
1456
1457 ret = s->do_cmdtest(dev, s, &async->cmd);
1458
1459 if (async->cmd.flags & TRIG_BOGUS || ret) {
1460 DPRINTK("test returned %d\n", ret);
1461 cmd = async->cmd;
1462 /* restore chanlist pointer before copying back */
1463 cmd.chanlist = (unsigned int __force *)user_chanlist;
1464 cmd.data = NULL;
1465 if (copy_to_user(arg, &cmd, sizeof(cmd))) {
1466 DPRINTK("fault writing cmd\n");
1467 ret = -EFAULT;
1468 goto cleanup;
1469 }
1470 ret = -EAGAIN;
1471 goto cleanup;
1472 }
1473
1474 if (!async->prealloc_bufsz) {
1475 ret = -ENOMEM;
1476 DPRINTK("no buffer (?)\n");
1477 goto cleanup;
1478 }
1479
1480 comedi_buf_reset(async);
1481
1482 async->cb_mask =
1483 COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR |
1484 COMEDI_CB_OVERFLOW;
1485 if (async->cmd.flags & TRIG_WAKE_EOS)
1486 async->cb_mask |= COMEDI_CB_EOS;
1487
1488 comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING);
1489
1490 /* set s->busy _after_ setting SRF_RUNNING flag to avoid race with
1491 * comedi_read() or comedi_write() */
1492 s->busy = file;
1493 ret = s->do_cmd(dev, s);
1494 if (ret == 0)
1495 return 0;
1496
1497 cleanup:
1498 do_become_nonbusy(dev, s);
1499
1500 return ret;
1501 }
1502
1503 /*
1504 COMEDI_CMDTEST
1505 command testing ioctl
1506
1507 arg:
1508 pointer to cmd structure
1509
1510 reads:
1511 cmd structure at arg
1512 channel/range list
1513
1514 writes:
1515 modified cmd structure at arg
1516
1517 */
1518 static int do_cmdtest_ioctl(struct comedi_device *dev,
1519 struct comedi_cmd __user *arg, void *file)
1520 {
1521 struct comedi_cmd cmd;
1522 struct comedi_subdevice *s;
1523 int ret = 0;
1524 unsigned int *chanlist = NULL;
1525 unsigned int __user *user_chanlist;
1526
1527 if (copy_from_user(&cmd, arg, sizeof(cmd))) {
1528 DPRINTK("bad cmd address\n");
1529 return -EFAULT;
1530 }
1531 /* save user's chanlist pointer so it can be restored later */
1532 user_chanlist = (unsigned int __user *)cmd.chanlist;
1533
1534 if (cmd.subdev >= dev->n_subdevices) {
1535 DPRINTK("%d no such subdevice\n", cmd.subdev);
1536 return -ENODEV;
1537 }
1538
1539 s = &dev->subdevices[cmd.subdev];
1540 if (s->type == COMEDI_SUBD_UNUSED) {
1541 DPRINTK("%d not valid subdevice\n", cmd.subdev);
1542 return -EIO;
1543 }
1544
1545 if (!s->do_cmd || !s->do_cmdtest) {
1546 DPRINTK("subdevice %i does not support commands\n",
1547 cmd.subdev);
1548 return -EIO;
1549 }
1550
1551 /* make sure channel/gain list isn't too long */
1552 if (cmd.chanlist_len > s->len_chanlist) {
1553 DPRINTK("channel/gain list too long %d > %d\n",
1554 cmd.chanlist_len, s->len_chanlist);
1555 ret = -EINVAL;
1556 goto cleanup;
1557 }
1558
1559 /* load channel/gain list */
1560 if (cmd.chanlist) {
1561 chanlist =
1562 kmalloc(cmd.chanlist_len * sizeof(int), GFP_KERNEL);
1563 if (!chanlist) {
1564 DPRINTK("allocation failed\n");
1565 ret = -ENOMEM;
1566 goto cleanup;
1567 }
1568
1569 if (copy_from_user(chanlist, user_chanlist,
1570 cmd.chanlist_len * sizeof(int))) {
1571 DPRINTK("fault reading chanlist\n");
1572 ret = -EFAULT;
1573 goto cleanup;
1574 }
1575
1576 /* make sure each element in channel/gain list is valid */
1577 ret = comedi_check_chanlist(s, cmd.chanlist_len, chanlist);
1578 if (ret < 0) {
1579 DPRINTK("bad chanlist\n");
1580 goto cleanup;
1581 }
1582
1583 cmd.chanlist = chanlist;
1584 }
1585
1586 ret = s->do_cmdtest(dev, s, &cmd);
1587
1588 /* restore chanlist pointer before copying back */
1589 cmd.chanlist = (unsigned int __force *)user_chanlist;
1590
1591 if (copy_to_user(arg, &cmd, sizeof(cmd))) {
1592 DPRINTK("bad cmd address\n");
1593 ret = -EFAULT;
1594 goto cleanup;
1595 }
1596 cleanup:
1597 kfree(chanlist);
1598
1599 return ret;
1600 }
1601
1602 /*
1603 COMEDI_LOCK
1604 lock subdevice
1605
1606 arg:
1607 subdevice number
1608
1609 reads:
1610 none
1611
1612 writes:
1613 none
1614
1615 */
1616
1617 static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg,
1618 void *file)
1619 {
1620 int ret = 0;
1621 unsigned long flags;
1622 struct comedi_subdevice *s;
1623
1624 if (arg >= dev->n_subdevices)
1625 return -EINVAL;
1626 s = &dev->subdevices[arg];
1627
1628 spin_lock_irqsave(&s->spin_lock, flags);
1629 if (s->busy || s->lock)
1630 ret = -EBUSY;
1631 else
1632 s->lock = file;
1633 spin_unlock_irqrestore(&s->spin_lock, flags);
1634
1635 #if 0
1636 if (ret < 0)
1637 return ret;
1638
1639 if (s->lock_f)
1640 ret = s->lock_f(dev, s);
1641 #endif
1642
1643 return ret;
1644 }
1645
1646 /*
1647 COMEDI_UNLOCK
1648 unlock subdevice
1649
1650 arg:
1651 subdevice number
1652
1653 reads:
1654 none
1655
1656 writes:
1657 none
1658
1659 This function isn't protected by the semaphore, since
1660 we already own the lock.
1661 */
1662 static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg,
1663 void *file)
1664 {
1665 struct comedi_subdevice *s;
1666
1667 if (arg >= dev->n_subdevices)
1668 return -EINVAL;
1669 s = &dev->subdevices[arg];
1670
1671 if (s->busy)
1672 return -EBUSY;
1673
1674 if (s->lock && s->lock != file)
1675 return -EACCES;
1676
1677 if (s->lock == file) {
1678 #if 0
1679 if (s->unlock)
1680 s->unlock(dev, s);
1681 #endif
1682
1683 s->lock = NULL;
1684 }
1685
1686 return 0;
1687 }
1688
1689 /*
1690 COMEDI_CANCEL
1691 cancel acquisition ioctl
1692
1693 arg:
1694 subdevice number
1695
1696 reads:
1697 nothing
1698
1699 writes:
1700 nothing
1701
1702 */
1703 static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg,
1704 void *file)
1705 {
1706 struct comedi_subdevice *s;
1707 int ret;
1708
1709 if (arg >= dev->n_subdevices)
1710 return -EINVAL;
1711 s = &dev->subdevices[arg];
1712 if (s->async == NULL)
1713 return -EINVAL;
1714
1715 if (s->lock && s->lock != file)
1716 return -EACCES;
1717
1718 if (!s->busy)
1719 return 0;
1720
1721 if (s->busy != file)
1722 return -EBUSY;
1723
1724 ret = do_cancel(dev, s);
1725 if (comedi_get_subdevice_runflags(s) & SRF_USER)
1726 wake_up_interruptible(&s->async->wait_head);
1727
1728 return ret;
1729 }
1730
1731 /*
1732 COMEDI_POLL ioctl
1733 instructs driver to synchronize buffers
1734
1735 arg:
1736 subdevice number
1737
1738 reads:
1739 nothing
1740
1741 writes:
1742 nothing
1743
1744 */
1745 static int do_poll_ioctl(struct comedi_device *dev, unsigned int arg,
1746 void *file)
1747 {
1748 struct comedi_subdevice *s;
1749
1750 if (arg >= dev->n_subdevices)
1751 return -EINVAL;
1752 s = &dev->subdevices[arg];
1753
1754 if (s->lock && s->lock != file)
1755 return -EACCES;
1756
1757 if (!s->busy)
1758 return 0;
1759
1760 if (s->busy != file)
1761 return -EBUSY;
1762
1763 if (s->poll)
1764 return s->poll(dev, s);
1765
1766 return -EINVAL;
1767 }
1768
1769 static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd,
1770 unsigned long arg)
1771 {
1772 const unsigned minor = iminor(file_inode(file));
1773 struct comedi_device *dev = comedi_dev_from_minor(minor);
1774 int rc;
1775
1776 if (!dev)
1777 return -ENODEV;
1778
1779 mutex_lock(&dev->mutex);
1780
1781 /* Device config is special, because it must work on
1782 * an unconfigured device. */
1783 if (cmd == COMEDI_DEVCONFIG) {
1784 if (minor >= COMEDI_NUM_BOARD_MINORS) {
1785 /* Device config not appropriate on non-board minors. */
1786 rc = -ENOTTY;
1787 goto done;
1788 }
1789 rc = do_devconfig_ioctl(dev,
1790 (struct comedi_devconfig __user *)arg);
1791 if (rc == 0) {
1792 if (arg == 0 &&
1793 dev->minor >= comedi_num_legacy_minors) {
1794 /* Successfully unconfigured a dynamically
1795 * allocated device. Try and remove it. */
1796 if (comedi_clear_board_dev(dev)) {
1797 mutex_unlock(&dev->mutex);
1798 comedi_free_board_dev(dev);
1799 return rc;
1800 }
1801 }
1802 }
1803 goto done;
1804 }
1805
1806 if (!dev->attached) {
1807 DPRINTK("no driver configured on /dev/comedi%i\n", dev->minor);
1808 rc = -ENODEV;
1809 goto done;
1810 }
1811
1812 switch (cmd) {
1813 case COMEDI_BUFCONFIG:
1814 rc = do_bufconfig_ioctl(dev,
1815 (struct comedi_bufconfig __user *)arg);
1816 break;
1817 case COMEDI_DEVINFO:
1818 rc = do_devinfo_ioctl(dev, (struct comedi_devinfo __user *)arg,
1819 file);
1820 break;
1821 case COMEDI_SUBDINFO:
1822 rc = do_subdinfo_ioctl(dev,
1823 (struct comedi_subdinfo __user *)arg,
1824 file);
1825 break;
1826 case COMEDI_CHANINFO:
1827 rc = do_chaninfo_ioctl(dev, (void __user *)arg);
1828 break;
1829 case COMEDI_RANGEINFO:
1830 rc = do_rangeinfo_ioctl(dev, (void __user *)arg);
1831 break;
1832 case COMEDI_BUFINFO:
1833 rc = do_bufinfo_ioctl(dev,
1834 (struct comedi_bufinfo __user *)arg,
1835 file);
1836 break;
1837 case COMEDI_LOCK:
1838 rc = do_lock_ioctl(dev, arg, file);
1839 break;
1840 case COMEDI_UNLOCK:
1841 rc = do_unlock_ioctl(dev, arg, file);
1842 break;
1843 case COMEDI_CANCEL:
1844 rc = do_cancel_ioctl(dev, arg, file);
1845 break;
1846 case COMEDI_CMD:
1847 rc = do_cmd_ioctl(dev, (struct comedi_cmd __user *)arg, file);
1848 break;
1849 case COMEDI_CMDTEST:
1850 rc = do_cmdtest_ioctl(dev, (struct comedi_cmd __user *)arg,
1851 file);
1852 break;
1853 case COMEDI_INSNLIST:
1854 rc = do_insnlist_ioctl(dev,
1855 (struct comedi_insnlist __user *)arg,
1856 file);
1857 break;
1858 case COMEDI_INSN:
1859 rc = do_insn_ioctl(dev, (struct comedi_insn __user *)arg,
1860 file);
1861 break;
1862 case COMEDI_POLL:
1863 rc = do_poll_ioctl(dev, arg, file);
1864 break;
1865 default:
1866 rc = -ENOTTY;
1867 break;
1868 }
1869
1870 done:
1871 mutex_unlock(&dev->mutex);
1872 return rc;
1873 }
1874
1875 static void comedi_vm_open(struct vm_area_struct *area)
1876 {
1877 struct comedi_async *async;
1878 struct comedi_device *dev;
1879
1880 async = area->vm_private_data;
1881 dev = async->subdevice->device;
1882
1883 mutex_lock(&dev->mutex);
1884 async->mmap_count++;
1885 mutex_unlock(&dev->mutex);
1886 }
1887
1888 static void comedi_vm_close(struct vm_area_struct *area)
1889 {
1890 struct comedi_async *async;
1891 struct comedi_device *dev;
1892
1893 async = area->vm_private_data;
1894 dev = async->subdevice->device;
1895
1896 mutex_lock(&dev->mutex);
1897 async->mmap_count--;
1898 mutex_unlock(&dev->mutex);
1899 }
1900
1901 static struct vm_operations_struct comedi_vm_ops = {
1902 .open = comedi_vm_open,
1903 .close = comedi_vm_close,
1904 };
1905
1906 static int comedi_mmap(struct file *file, struct vm_area_struct *vma)
1907 {
1908 const unsigned minor = iminor(file_inode(file));
1909 struct comedi_device *dev = comedi_dev_from_minor(minor);
1910 struct comedi_subdevice *s;
1911 struct comedi_async *async;
1912 unsigned long start = vma->vm_start;
1913 unsigned long size;
1914 int n_pages;
1915 int i;
1916 int retval;
1917
1918 if (!dev)
1919 return -ENODEV;
1920
1921 mutex_lock(&dev->mutex);
1922
1923 if (!dev->attached) {
1924 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1925 retval = -ENODEV;
1926 goto done;
1927 }
1928
1929 if (vma->vm_flags & VM_WRITE)
1930 s = comedi_write_subdevice(dev, minor);
1931 else
1932 s = comedi_read_subdevice(dev, minor);
1933 if (!s) {
1934 retval = -EINVAL;
1935 goto done;
1936 }
1937
1938 async = s->async;
1939 if (!async) {
1940 retval = -EINVAL;
1941 goto done;
1942 }
1943
1944 if (vma->vm_pgoff != 0) {
1945 DPRINTK("comedi: mmap() offset must be 0.\n");
1946 retval = -EINVAL;
1947 goto done;
1948 }
1949
1950 size = vma->vm_end - vma->vm_start;
1951 if (size > async->prealloc_bufsz) {
1952 retval = -EFAULT;
1953 goto done;
1954 }
1955 if (size & (~PAGE_MASK)) {
1956 retval = -EFAULT;
1957 goto done;
1958 }
1959
1960 n_pages = size >> PAGE_SHIFT;
1961 for (i = 0; i < n_pages; ++i) {
1962 struct comedi_buf_page *buf = &async->buf_page_list[i];
1963
1964 if (remap_pfn_range(vma, start,
1965 page_to_pfn(virt_to_page(buf->virt_addr)),
1966 PAGE_SIZE, PAGE_SHARED)) {
1967 retval = -EAGAIN;
1968 goto done;
1969 }
1970 start += PAGE_SIZE;
1971 }
1972
1973 vma->vm_ops = &comedi_vm_ops;
1974 vma->vm_private_data = async;
1975
1976 async->mmap_count++;
1977
1978 retval = 0;
1979 done:
1980 mutex_unlock(&dev->mutex);
1981 return retval;
1982 }
1983
1984 static unsigned int comedi_poll(struct file *file, poll_table *wait)
1985 {
1986 unsigned int mask = 0;
1987 const unsigned minor = iminor(file_inode(file));
1988 struct comedi_device *dev = comedi_dev_from_minor(minor);
1989 struct comedi_subdevice *s;
1990
1991 if (!dev)
1992 return -ENODEV;
1993
1994 mutex_lock(&dev->mutex);
1995
1996 if (!dev->attached) {
1997 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1998 goto done;
1999 }
2000
2001 s = comedi_read_subdevice(dev, minor);
2002 if (s && s->async) {
2003 poll_wait(file, &s->async->wait_head, wait);
2004 if (!s->busy || !comedi_is_subdevice_running(s) ||
2005 comedi_buf_read_n_available(s->async) > 0)
2006 mask |= POLLIN | POLLRDNORM;
2007 }
2008
2009 s = comedi_write_subdevice(dev, minor);
2010 if (s && s->async) {
2011 unsigned int bps = bytes_per_sample(s->async->subdevice);
2012
2013 poll_wait(file, &s->async->wait_head, wait);
2014 comedi_buf_write_alloc(s->async, s->async->prealloc_bufsz);
2015 if (!s->busy || !comedi_is_subdevice_running(s) ||
2016 comedi_buf_write_n_allocated(s->async) >= bps)
2017 mask |= POLLOUT | POLLWRNORM;
2018 }
2019
2020 done:
2021 mutex_unlock(&dev->mutex);
2022 return mask;
2023 }
2024
2025 static ssize_t comedi_write(struct file *file, const char __user *buf,
2026 size_t nbytes, loff_t *offset)
2027 {
2028 struct comedi_subdevice *s;
2029 struct comedi_async *async;
2030 int n, m, count = 0, retval = 0;
2031 DECLARE_WAITQUEUE(wait, current);
2032 const unsigned minor = iminor(file_inode(file));
2033 struct comedi_device *dev = comedi_dev_from_minor(minor);
2034
2035 if (!dev)
2036 return -ENODEV;
2037
2038 if (!dev->attached) {
2039 DPRINTK("no driver configured on comedi%i\n", dev->minor);
2040 return -ENODEV;
2041 }
2042
2043 s = comedi_write_subdevice(dev, minor);
2044 if (!s || !s->async)
2045 return -EIO;
2046
2047 async = s->async;
2048
2049 if (!s->busy || !nbytes)
2050 return 0;
2051 if (s->busy != file)
2052 return -EACCES;
2053
2054 add_wait_queue(&async->wait_head, &wait);
2055 while (nbytes > 0 && !retval) {
2056 set_current_state(TASK_INTERRUPTIBLE);
2057
2058 if (!comedi_is_subdevice_running(s)) {
2059 if (count == 0) {
2060 mutex_lock(&dev->mutex);
2061 if (comedi_is_subdevice_in_error(s))
2062 retval = -EPIPE;
2063 else
2064 retval = 0;
2065 do_become_nonbusy(dev, s);
2066 mutex_unlock(&dev->mutex);
2067 }
2068 break;
2069 }
2070
2071 n = nbytes;
2072
2073 m = n;
2074 if (async->buf_write_ptr + m > async->prealloc_bufsz)
2075 m = async->prealloc_bufsz - async->buf_write_ptr;
2076 comedi_buf_write_alloc(async, async->prealloc_bufsz);
2077 if (m > comedi_buf_write_n_allocated(async))
2078 m = comedi_buf_write_n_allocated(async);
2079 if (m < n)
2080 n = m;
2081
2082 if (n == 0) {
2083 if (file->f_flags & O_NONBLOCK) {
2084 retval = -EAGAIN;
2085 break;
2086 }
2087 schedule();
2088 if (signal_pending(current)) {
2089 retval = -ERESTARTSYS;
2090 break;
2091 }
2092 if (!s->busy)
2093 break;
2094 if (s->busy != file) {
2095 retval = -EACCES;
2096 break;
2097 }
2098 continue;
2099 }
2100
2101 m = copy_from_user(async->prealloc_buf + async->buf_write_ptr,
2102 buf, n);
2103 if (m) {
2104 n -= m;
2105 retval = -EFAULT;
2106 }
2107 comedi_buf_write_free(async, n);
2108
2109 count += n;
2110 nbytes -= n;
2111
2112 buf += n;
2113 break; /* makes device work like a pipe */
2114 }
2115 set_current_state(TASK_RUNNING);
2116 remove_wait_queue(&async->wait_head, &wait);
2117
2118 return count ? count : retval;
2119 }
2120
2121 static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes,
2122 loff_t *offset)
2123 {
2124 struct comedi_subdevice *s;
2125 struct comedi_async *async;
2126 int n, m, count = 0, retval = 0;
2127 DECLARE_WAITQUEUE(wait, current);
2128 const unsigned minor = iminor(file_inode(file));
2129 struct comedi_device *dev = comedi_dev_from_minor(minor);
2130
2131 if (!dev)
2132 return -ENODEV;
2133
2134 if (!dev->attached) {
2135 DPRINTK("no driver configured on comedi%i\n", dev->minor);
2136 return -ENODEV;
2137 }
2138
2139 s = comedi_read_subdevice(dev, minor);
2140 if (!s || !s->async)
2141 return -EIO;
2142
2143 async = s->async;
2144 if (!s->busy || !nbytes)
2145 return 0;
2146 if (s->busy != file)
2147 return -EACCES;
2148
2149 add_wait_queue(&async->wait_head, &wait);
2150 while (nbytes > 0 && !retval) {
2151 set_current_state(TASK_INTERRUPTIBLE);
2152
2153 n = nbytes;
2154
2155 m = comedi_buf_read_n_available(async);
2156 /* printk("%d available\n",m); */
2157 if (async->buf_read_ptr + m > async->prealloc_bufsz)
2158 m = async->prealloc_bufsz - async->buf_read_ptr;
2159 /* printk("%d contiguous\n",m); */
2160 if (m < n)
2161 n = m;
2162
2163 if (n == 0) {
2164 if (!comedi_is_subdevice_running(s)) {
2165 mutex_lock(&dev->mutex);
2166 do_become_nonbusy(dev, s);
2167 if (comedi_is_subdevice_in_error(s))
2168 retval = -EPIPE;
2169 else
2170 retval = 0;
2171 mutex_unlock(&dev->mutex);
2172 break;
2173 }
2174 if (file->f_flags & O_NONBLOCK) {
2175 retval = -EAGAIN;
2176 break;
2177 }
2178 schedule();
2179 if (signal_pending(current)) {
2180 retval = -ERESTARTSYS;
2181 break;
2182 }
2183 if (!s->busy) {
2184 retval = 0;
2185 break;
2186 }
2187 if (s->busy != file) {
2188 retval = -EACCES;
2189 break;
2190 }
2191 continue;
2192 }
2193 m = copy_to_user(buf, async->prealloc_buf +
2194 async->buf_read_ptr, n);
2195 if (m) {
2196 n -= m;
2197 retval = -EFAULT;
2198 }
2199
2200 comedi_buf_read_alloc(async, n);
2201 comedi_buf_read_free(async, n);
2202
2203 count += n;
2204 nbytes -= n;
2205
2206 buf += n;
2207 break; /* makes device work like a pipe */
2208 }
2209 if (comedi_is_subdevice_idle(s)) {
2210 mutex_lock(&dev->mutex);
2211 if (async->buf_read_count - async->buf_write_count == 0)
2212 do_become_nonbusy(dev, s);
2213 mutex_unlock(&dev->mutex);
2214 }
2215 set_current_state(TASK_RUNNING);
2216 remove_wait_queue(&async->wait_head, &wait);
2217
2218 return count ? count : retval;
2219 }
2220
2221 static int comedi_open(struct inode *inode, struct file *file)
2222 {
2223 const unsigned minor = iminor(inode);
2224 struct comedi_device *dev = comedi_dev_from_minor(minor);
2225
2226 if (!dev) {
2227 DPRINTK("invalid minor number\n");
2228 return -ENODEV;
2229 }
2230
2231 /* This is slightly hacky, but we want module autoloading
2232 * to work for root.
2233 * case: user opens device, attached -> ok
2234 * case: user opens device, unattached, !in_request_module -> autoload
2235 * case: user opens device, unattached, in_request_module -> fail
2236 * case: root opens device, attached -> ok
2237 * case: root opens device, unattached, in_request_module -> ok
2238 * (typically called from modprobe)
2239 * case: root opens device, unattached, !in_request_module -> autoload
2240 *
2241 * The last could be changed to "-> ok", which would deny root
2242 * autoloading.
2243 */
2244 mutex_lock(&dev->mutex);
2245 if (dev->attached)
2246 goto ok;
2247 if (!capable(CAP_NET_ADMIN) && dev->in_request_module) {
2248 DPRINTK("in request module\n");
2249 mutex_unlock(&dev->mutex);
2250 return -ENODEV;
2251 }
2252 if (capable(CAP_NET_ADMIN) && dev->in_request_module)
2253 goto ok;
2254
2255 dev->in_request_module = true;
2256
2257 #ifdef CONFIG_KMOD
2258 mutex_unlock(&dev->mutex);
2259 request_module("char-major-%i-%i", COMEDI_MAJOR, dev->minor);
2260 mutex_lock(&dev->mutex);
2261 #endif
2262
2263 dev->in_request_module = false;
2264
2265 if (!dev->attached && !capable(CAP_NET_ADMIN)) {
2266 DPRINTK("not attached and not CAP_NET_ADMIN\n");
2267 mutex_unlock(&dev->mutex);
2268 return -ENODEV;
2269 }
2270 ok:
2271 __module_get(THIS_MODULE);
2272
2273 if (dev->attached) {
2274 if (!try_module_get(dev->driver->module)) {
2275 module_put(THIS_MODULE);
2276 mutex_unlock(&dev->mutex);
2277 return -ENOSYS;
2278 }
2279 }
2280
2281 if (dev->attached && dev->use_count == 0 && dev->open) {
2282 int rc = dev->open(dev);
2283 if (rc < 0) {
2284 module_put(dev->driver->module);
2285 module_put(THIS_MODULE);
2286 mutex_unlock(&dev->mutex);
2287 return rc;
2288 }
2289 }
2290
2291 dev->use_count++;
2292
2293 mutex_unlock(&dev->mutex);
2294
2295 return 0;
2296 }
2297
2298 static int comedi_fasync(int fd, struct file *file, int on)
2299 {
2300 const unsigned minor = iminor(file_inode(file));
2301 struct comedi_device *dev = comedi_dev_from_minor(minor);
2302
2303 if (!dev)
2304 return -ENODEV;
2305
2306 return fasync_helper(fd, file, on, &dev->async_queue);
2307 }
2308
2309 static int comedi_close(struct inode *inode, struct file *file)
2310 {
2311 const unsigned minor = iminor(inode);
2312 struct comedi_device *dev = comedi_dev_from_minor(minor);
2313 struct comedi_subdevice *s = NULL;
2314 int i;
2315
2316 if (!dev)
2317 return -ENODEV;
2318
2319 mutex_lock(&dev->mutex);
2320
2321 if (dev->subdevices) {
2322 for (i = 0; i < dev->n_subdevices; i++) {
2323 s = &dev->subdevices[i];
2324
2325 if (s->busy == file)
2326 do_cancel(dev, s);
2327 if (s->lock == file)
2328 s->lock = NULL;
2329 }
2330 }
2331 if (dev->attached && dev->use_count == 1 && dev->close)
2332 dev->close(dev);
2333
2334 module_put(THIS_MODULE);
2335 if (dev->attached)
2336 module_put(dev->driver->module);
2337
2338 dev->use_count--;
2339
2340 mutex_unlock(&dev->mutex);
2341
2342 return 0;
2343 }
2344
2345 static const struct file_operations comedi_fops = {
2346 .owner = THIS_MODULE,
2347 .unlocked_ioctl = comedi_unlocked_ioctl,
2348 .compat_ioctl = comedi_compat_ioctl,
2349 .open = comedi_open,
2350 .release = comedi_close,
2351 .read = comedi_read,
2352 .write = comedi_write,
2353 .mmap = comedi_mmap,
2354 .poll = comedi_poll,
2355 .fasync = comedi_fasync,
2356 .llseek = noop_llseek,
2357 };
2358
2359 void comedi_error(const struct comedi_device *dev, const char *s)
2360 {
2361 dev_err(dev->class_dev, "%s: %s\n", dev->driver->driver_name, s);
2362 }
2363 EXPORT_SYMBOL_GPL(comedi_error);
2364
2365 void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s)
2366 {
2367 struct comedi_async *async = s->async;
2368 unsigned runflags = 0;
2369 unsigned runflags_mask = 0;
2370
2371 /* DPRINTK("comedi_event 0x%x\n",mask); */
2372
2373 if (!comedi_is_subdevice_running(s))
2374 return;
2375
2376 if (s->
2377 async->events & (COMEDI_CB_EOA | COMEDI_CB_ERROR |
2378 COMEDI_CB_OVERFLOW)) {
2379 runflags_mask |= SRF_RUNNING;
2380 }
2381 /* remember if an error event has occurred, so an error
2382 * can be returned the next time the user does a read() */
2383 if (s->async->events & (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) {
2384 runflags_mask |= SRF_ERROR;
2385 runflags |= SRF_ERROR;
2386 }
2387 if (runflags_mask) {
2388 /*sets SRF_ERROR and SRF_RUNNING together atomically */
2389 comedi_set_subdevice_runflags(s, runflags_mask, runflags);
2390 }
2391
2392 if (async->cb_mask & s->async->events) {
2393 if (comedi_get_subdevice_runflags(s) & SRF_USER) {
2394 wake_up_interruptible(&async->wait_head);
2395 if (s->subdev_flags & SDF_CMD_READ)
2396 kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
2397 if (s->subdev_flags & SDF_CMD_WRITE)
2398 kill_fasync(&dev->async_queue, SIGIO, POLL_OUT);
2399 } else {
2400 if (async->cb_func)
2401 async->cb_func(s->async->events, async->cb_arg);
2402 }
2403 }
2404 s->async->events = 0;
2405 }
2406 EXPORT_SYMBOL_GPL(comedi_event);
2407
2408 /* Note: the ->mutex is pre-locked on successful return */
2409 struct comedi_device *comedi_alloc_board_minor(struct device *hardware_device)
2410 {
2411 struct comedi_device *dev;
2412 struct device *csdev;
2413 unsigned i;
2414
2415 dev = kzalloc(sizeof(struct comedi_device), GFP_KERNEL);
2416 if (dev == NULL)
2417 return ERR_PTR(-ENOMEM);
2418 comedi_device_init(dev);
2419 comedi_set_hw_dev(dev, hardware_device);
2420 mutex_lock(&dev->mutex);
2421 mutex_lock(&comedi_board_minor_table_lock);
2422 for (i = hardware_device ? comedi_num_legacy_minors : 0;
2423 i < COMEDI_NUM_BOARD_MINORS; ++i) {
2424 if (comedi_board_minor_table[i] == NULL) {
2425 comedi_board_minor_table[i] = dev;
2426 break;
2427 }
2428 }
2429 mutex_unlock(&comedi_board_minor_table_lock);
2430 if (i == COMEDI_NUM_BOARD_MINORS) {
2431 mutex_unlock(&dev->mutex);
2432 comedi_device_cleanup(dev);
2433 kfree(dev);
2434 pr_err("comedi: error: ran out of minor numbers for board device files.\n");
2435 return ERR_PTR(-EBUSY);
2436 }
2437 dev->minor = i;
2438 csdev = device_create(comedi_class, hardware_device,
2439 MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i", i);
2440 if (!IS_ERR(csdev))
2441 dev->class_dev = csdev;
2442
2443 /* Note: dev->mutex needs to be unlocked by the caller. */
2444 return dev;
2445 }
2446
2447 static void comedi_free_board_minor(unsigned minor)
2448 {
2449 BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS);
2450 comedi_free_board_dev(comedi_clear_board_minor(minor));
2451 }
2452
2453 void comedi_release_hardware_device(struct device *hardware_device)
2454 {
2455 int minor;
2456 struct comedi_device *dev;
2457
2458 for (minor = comedi_num_legacy_minors; minor < COMEDI_NUM_BOARD_MINORS;
2459 minor++) {
2460 mutex_lock(&comedi_board_minor_table_lock);
2461 dev = comedi_board_minor_table[minor];
2462 if (dev && dev->hw_dev == hardware_device) {
2463 comedi_board_minor_table[minor] = NULL;
2464 mutex_unlock(&comedi_board_minor_table_lock);
2465 comedi_free_board_dev(dev);
2466 break;
2467 }
2468 mutex_unlock(&comedi_board_minor_table_lock);
2469 }
2470 }
2471
2472 int comedi_alloc_subdevice_minor(struct comedi_subdevice *s)
2473 {
2474 struct comedi_device *dev = s->device;
2475 struct device *csdev;
2476 unsigned i;
2477
2478 mutex_lock(&comedi_subdevice_minor_table_lock);
2479 for (i = 0; i < COMEDI_NUM_SUBDEVICE_MINORS; ++i) {
2480 if (comedi_subdevice_minor_table[i] == NULL) {
2481 comedi_subdevice_minor_table[i] = s;
2482 break;
2483 }
2484 }
2485 mutex_unlock(&comedi_subdevice_minor_table_lock);
2486 if (i == COMEDI_NUM_SUBDEVICE_MINORS) {
2487 pr_err("comedi: error: ran out of minor numbers for subdevice files.\n");
2488 return -EBUSY;
2489 }
2490 i += COMEDI_NUM_BOARD_MINORS;
2491 s->minor = i;
2492 csdev = device_create(comedi_class, dev->class_dev,
2493 MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i_subd%i",
2494 dev->minor, s->index);
2495 if (!IS_ERR(csdev))
2496 s->class_dev = csdev;
2497
2498 return 0;
2499 }
2500
2501 void comedi_free_subdevice_minor(struct comedi_subdevice *s)
2502 {
2503 unsigned int i;
2504
2505 if (s == NULL)
2506 return;
2507 if (s->minor < 0)
2508 return;
2509
2510 BUG_ON(s->minor >= COMEDI_NUM_MINORS);
2511 BUG_ON(s->minor < COMEDI_NUM_BOARD_MINORS);
2512
2513 i = s->minor - COMEDI_NUM_BOARD_MINORS;
2514 mutex_lock(&comedi_subdevice_minor_table_lock);
2515 if (s == comedi_subdevice_minor_table[i])
2516 comedi_subdevice_minor_table[i] = NULL;
2517 mutex_unlock(&comedi_subdevice_minor_table_lock);
2518 if (s->class_dev) {
2519 device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor));
2520 s->class_dev = NULL;
2521 }
2522 }
2523
2524 static void comedi_cleanup_board_minors(void)
2525 {
2526 unsigned i;
2527
2528 for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++)
2529 comedi_free_board_minor(i);
2530 }
2531
2532 static int __init comedi_init(void)
2533 {
2534 int i;
2535 int retval;
2536
2537 pr_info("comedi: version " COMEDI_RELEASE " - http://www.comedi.org\n");
2538
2539 if (comedi_num_legacy_minors < 0 ||
2540 comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) {
2541 pr_err("comedi: error: invalid value for module parameter \"comedi_num_legacy_minors\". Valid values are 0 through %i.\n",
2542 COMEDI_NUM_BOARD_MINORS);
2543 return -EINVAL;
2544 }
2545
2546 retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2547 COMEDI_NUM_MINORS, "comedi");
2548 if (retval)
2549 return -EIO;
2550 cdev_init(&comedi_cdev, &comedi_fops);
2551 comedi_cdev.owner = THIS_MODULE;
2552 kobject_set_name(&comedi_cdev.kobj, "comedi");
2553 if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) {
2554 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2555 COMEDI_NUM_MINORS);
2556 return -EIO;
2557 }
2558 comedi_class = class_create(THIS_MODULE, "comedi");
2559 if (IS_ERR(comedi_class)) {
2560 pr_err("comedi: failed to create class\n");
2561 cdev_del(&comedi_cdev);
2562 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2563 COMEDI_NUM_MINORS);
2564 return PTR_ERR(comedi_class);
2565 }
2566
2567 comedi_class->dev_attrs = comedi_dev_attrs;
2568
2569 /* XXX requires /proc interface */
2570 comedi_proc_init();
2571
2572 /* create devices files for legacy/manual use */
2573 for (i = 0; i < comedi_num_legacy_minors; i++) {
2574 struct comedi_device *dev;
2575 dev = comedi_alloc_board_minor(NULL);
2576 if (IS_ERR(dev)) {
2577 comedi_cleanup_board_minors();
2578 cdev_del(&comedi_cdev);
2579 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2580 COMEDI_NUM_MINORS);
2581 return PTR_ERR(dev);
2582 } else {
2583 /* comedi_alloc_board_minor() locked the mutex */
2584 mutex_unlock(&dev->mutex);
2585 }
2586 }
2587
2588 return 0;
2589 }
2590 module_init(comedi_init);
2591
2592 static void __exit comedi_cleanup(void)
2593 {
2594 int i;
2595
2596 comedi_cleanup_board_minors();
2597 for (i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i)
2598 BUG_ON(comedi_board_minor_table[i]);
2599 for (i = 0; i < COMEDI_NUM_SUBDEVICE_MINORS; ++i)
2600 BUG_ON(comedi_subdevice_minor_table[i]);
2601
2602 class_destroy(comedi_class);
2603 cdev_del(&comedi_cdev);
2604 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS);
2605
2606 comedi_proc_cleanup();
2607 }
2608 module_exit(comedi_cleanup);
2609
2610 MODULE_AUTHOR("http://www.comedi.org");
2611 MODULE_DESCRIPTION("Comedi core module");
2612 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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