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