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195d56d8a1ee0c9fadfbb0594c78037234367827
[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 #ifdef CONFIG_COMEDI_DEBUG
53 int comedi_debug;
54 EXPORT_SYMBOL(comedi_debug);
55 module_param(comedi_debug, int, S_IRUGO | S_IWUSR);
56 MODULE_PARM_DESC(comedi_debug,
57 "enable comedi core and driver debugging if non-zero (default 0)"
58 );
59 #endif
60
61 static int comedi_num_legacy_minors;
62 module_param(comedi_num_legacy_minors, int, S_IRUGO);
63 MODULE_PARM_DESC(comedi_num_legacy_minors,
64 "number of comedi minor devices to reserve for non-auto-configured devices (default 0)"
65 );
66
67 unsigned int comedi_default_buf_size_kb = CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB;
68 module_param(comedi_default_buf_size_kb, uint, S_IRUGO | S_IWUSR);
69 MODULE_PARM_DESC(comedi_default_buf_size_kb,
70 "default asynchronous buffer size in KiB (default "
71 __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB) ")");
72
73 unsigned int comedi_default_buf_maxsize_kb
74 = CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB;
75 module_param(comedi_default_buf_maxsize_kb, uint, S_IRUGO | S_IWUSR);
76 MODULE_PARM_DESC(comedi_default_buf_maxsize_kb,
77 "default maximum size of asynchronous buffer in KiB (default "
78 __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB) ")");
79
80 struct comedi_file_info {
81 struct comedi_device *device;
82 struct comedi_subdevice *read_subdevice;
83 struct comedi_subdevice *write_subdevice;
84 struct device *hardware_device;
85 };
86
87 static DEFINE_SPINLOCK(comedi_file_info_table_lock);
88 static struct comedi_file_info *comedi_file_info_table[COMEDI_NUM_MINORS];
89
90 static struct comedi_file_info *comedi_file_info_from_minor(unsigned minor)
91 {
92 struct comedi_file_info *info;
93
94 BUG_ON(minor >= COMEDI_NUM_MINORS);
95 spin_lock(&comedi_file_info_table_lock);
96 info = comedi_file_info_table[minor];
97 spin_unlock(&comedi_file_info_table_lock);
98 return info;
99 }
100
101 static struct comedi_device *
102 comedi_dev_from_file_info(struct comedi_file_info *info)
103 {
104 return info ? info->device : NULL;
105 }
106
107 struct comedi_device *comedi_dev_from_minor(unsigned minor)
108 {
109 return comedi_dev_from_file_info(comedi_file_info_from_minor(minor));
110 }
111 EXPORT_SYMBOL_GPL(comedi_dev_from_minor);
112
113 static struct comedi_subdevice *
114 comedi_read_subdevice(const struct comedi_file_info *info)
115 {
116 if (info->read_subdevice)
117 return info->read_subdevice;
118 if (info->device)
119 return info->device->read_subdev;
120 return NULL;
121 }
122
123 static struct comedi_subdevice *
124 comedi_write_subdevice(const struct comedi_file_info *info)
125 {
126 if (info->write_subdevice)
127 return info->write_subdevice;
128 if (info->device)
129 return info->device->write_subdev;
130 return NULL;
131 }
132
133 static int resize_async_buffer(struct comedi_device *dev,
134 struct comedi_subdevice *s,
135 struct comedi_async *async, unsigned new_size)
136 {
137 int retval;
138
139 if (new_size > async->max_bufsize)
140 return -EPERM;
141
142 if (s->busy) {
143 DPRINTK("subdevice is busy, cannot resize buffer\n");
144 return -EBUSY;
145 }
146 if (async->mmap_count) {
147 DPRINTK("subdevice is mmapped, cannot resize buffer\n");
148 return -EBUSY;
149 }
150
151 if (!async->prealloc_buf)
152 return -EINVAL;
153
154 /* make sure buffer is an integral number of pages
155 * (we round up) */
156 new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK;
157
158 retval = comedi_buf_alloc(dev, s, new_size);
159 if (retval < 0)
160 return retval;
161
162 if (s->buf_change) {
163 retval = s->buf_change(dev, s, new_size);
164 if (retval < 0)
165 return retval;
166 }
167
168 DPRINTK("comedi%i subd %d buffer resized to %i bytes\n",
169 dev->minor, s->index, async->prealloc_bufsz);
170 return 0;
171 }
172
173 /* sysfs attribute files */
174
175 static ssize_t show_max_read_buffer_kb(struct device *dev,
176 struct device_attribute *attr, char *buf)
177 {
178 struct comedi_file_info *info = dev_get_drvdata(dev);
179 struct comedi_subdevice *s = comedi_read_subdevice(info);
180 unsigned int size = 0;
181
182 mutex_lock(&info->device->mutex);
183 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
184 size = s->async->max_bufsize / 1024;
185 mutex_unlock(&info->device->mutex);
186
187 return snprintf(buf, PAGE_SIZE, "%i\n", size);
188 }
189
190 static ssize_t store_max_read_buffer_kb(struct device *dev,
191 struct device_attribute *attr,
192 const char *buf, size_t count)
193 {
194 struct comedi_file_info *info = dev_get_drvdata(dev);
195 struct comedi_subdevice *s = comedi_read_subdevice(info);
196 unsigned int size;
197 int err;
198
199 err = kstrtouint(buf, 10, &size);
200 if (err)
201 return err;
202 if (size > (UINT_MAX / 1024))
203 return -EINVAL;
204 size *= 1024;
205
206 mutex_lock(&info->device->mutex);
207 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
208 s->async->max_bufsize = size;
209 else
210 err = -EINVAL;
211 mutex_unlock(&info->device->mutex);
212
213 return err ? err : count;
214 }
215
216 static ssize_t show_read_buffer_kb(struct device *dev,
217 struct device_attribute *attr, char *buf)
218 {
219 struct comedi_file_info *info = dev_get_drvdata(dev);
220 struct comedi_subdevice *s = comedi_read_subdevice(info);
221 unsigned int size = 0;
222
223 mutex_lock(&info->device->mutex);
224 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
225 size = s->async->prealloc_bufsz / 1024;
226 mutex_unlock(&info->device->mutex);
227
228 return snprintf(buf, PAGE_SIZE, "%i\n", size);
229 }
230
231 static ssize_t store_read_buffer_kb(struct device *dev,
232 struct device_attribute *attr,
233 const char *buf, size_t count)
234 {
235 struct comedi_file_info *info = dev_get_drvdata(dev);
236 struct comedi_subdevice *s = comedi_read_subdevice(info);
237 unsigned int size;
238 int err;
239
240 err = kstrtouint(buf, 10, &size);
241 if (err)
242 return err;
243 if (size > (UINT_MAX / 1024))
244 return -EINVAL;
245 size *= 1024;
246
247 mutex_lock(&info->device->mutex);
248 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
249 err = resize_async_buffer(info->device, s, s->async, size);
250 else
251 err = -EINVAL;
252 mutex_unlock(&info->device->mutex);
253
254 return err ? err : count;
255 }
256
257 static ssize_t show_max_write_buffer_kb(struct device *dev,
258 struct device_attribute *attr,
259 char *buf)
260 {
261 struct comedi_file_info *info = dev_get_drvdata(dev);
262 struct comedi_subdevice *s = comedi_write_subdevice(info);
263 unsigned int size = 0;
264
265 mutex_lock(&info->device->mutex);
266 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
267 size = s->async->max_bufsize / 1024;
268 mutex_unlock(&info->device->mutex);
269
270 return snprintf(buf, PAGE_SIZE, "%i\n", size);
271 }
272
273 static ssize_t store_max_write_buffer_kb(struct device *dev,
274 struct device_attribute *attr,
275 const char *buf, size_t count)
276 {
277 struct comedi_file_info *info = dev_get_drvdata(dev);
278 struct comedi_subdevice *s = comedi_write_subdevice(info);
279 unsigned int size;
280 int err;
281
282 err = kstrtouint(buf, 10, &size);
283 if (err)
284 return err;
285 if (size > (UINT_MAX / 1024))
286 return -EINVAL;
287 size *= 1024;
288
289 mutex_lock(&info->device->mutex);
290 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
291 s->async->max_bufsize = size;
292 else
293 err = -EINVAL;
294 mutex_unlock(&info->device->mutex);
295
296 return err ? err : count;
297 }
298
299 static ssize_t show_write_buffer_kb(struct device *dev,
300 struct device_attribute *attr, char *buf)
301 {
302 struct comedi_file_info *info = dev_get_drvdata(dev);
303 struct comedi_subdevice *s = comedi_write_subdevice(info);
304 unsigned int size = 0;
305
306 mutex_lock(&info->device->mutex);
307 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
308 size = s->async->prealloc_bufsz / 1024;
309 mutex_unlock(&info->device->mutex);
310
311 return snprintf(buf, PAGE_SIZE, "%i\n", size);
312 }
313
314 static ssize_t store_write_buffer_kb(struct device *dev,
315 struct device_attribute *attr,
316 const char *buf, size_t count)
317 {
318 struct comedi_file_info *info = dev_get_drvdata(dev);
319 struct comedi_subdevice *s = comedi_write_subdevice(info);
320 unsigned int size;
321 int err;
322
323 err = kstrtouint(buf, 10, &size);
324 if (err)
325 return err;
326 if (size > (UINT_MAX / 1024))
327 return -EINVAL;
328 size *= 1024;
329
330 mutex_lock(&info->device->mutex);
331 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
332 err = resize_async_buffer(info->device, s, s->async, size);
333 else
334 err = -EINVAL;
335 mutex_unlock(&info->device->mutex);
336
337 return err ? err : count;
338 }
339
340 static struct device_attribute comedi_dev_attrs[] = {
341 __ATTR(max_read_buffer_kb, S_IRUGO | S_IWUSR,
342 show_max_read_buffer_kb, store_max_read_buffer_kb),
343 __ATTR(read_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP,
344 show_read_buffer_kb, store_read_buffer_kb),
345 __ATTR(max_write_buffer_kb, S_IRUGO | S_IWUSR,
346 show_max_write_buffer_kb, store_max_write_buffer_kb),
347 __ATTR(write_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP,
348 show_write_buffer_kb, store_write_buffer_kb),
349 __ATTR_NULL
350 };
351
352 static void comedi_set_subdevice_runflags(struct comedi_subdevice *s,
353 unsigned mask, unsigned bits)
354 {
355 unsigned long flags;
356
357 spin_lock_irqsave(&s->spin_lock, flags);
358 s->runflags &= ~mask;
359 s->runflags |= (bits & mask);
360 spin_unlock_irqrestore(&s->spin_lock, flags);
361 }
362
363 static unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s)
364 {
365 unsigned long flags;
366 unsigned runflags;
367
368 spin_lock_irqsave(&s->spin_lock, flags);
369 runflags = s->runflags;
370 spin_unlock_irqrestore(&s->spin_lock, flags);
371 return runflags;
372 }
373
374 bool comedi_is_subdevice_running(struct comedi_subdevice *s)
375 {
376 unsigned runflags = comedi_get_subdevice_runflags(s);
377
378 return (runflags & SRF_RUNNING) ? true : false;
379 }
380 EXPORT_SYMBOL_GPL(comedi_is_subdevice_running);
381
382 static bool comedi_is_subdevice_in_error(struct comedi_subdevice *s)
383 {
384 unsigned runflags = comedi_get_subdevice_runflags(s);
385
386 return (runflags & SRF_ERROR) ? true : false;
387 }
388
389 static bool comedi_is_subdevice_idle(struct comedi_subdevice *s)
390 {
391 unsigned runflags = comedi_get_subdevice_runflags(s);
392
393 return (runflags & (SRF_ERROR | SRF_RUNNING)) ? false : true;
394 }
395
396 /*
397 This function restores a subdevice to an idle state.
398 */
399 static void do_become_nonbusy(struct comedi_device *dev,
400 struct comedi_subdevice *s)
401 {
402 struct comedi_async *async = s->async;
403
404 comedi_set_subdevice_runflags(s, SRF_RUNNING, 0);
405 if (async) {
406 comedi_buf_reset(async);
407 async->inttrig = NULL;
408 kfree(async->cmd.chanlist);
409 async->cmd.chanlist = NULL;
410 } else {
411 dev_err(dev->class_dev,
412 "BUG: (?) do_become_nonbusy called with async=NULL\n");
413 }
414
415 s->busy = NULL;
416 }
417
418 static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
419 {
420 int ret = 0;
421
422 if (comedi_is_subdevice_running(s) && s->cancel)
423 ret = s->cancel(dev, s);
424
425 do_become_nonbusy(dev, s);
426
427 return ret;
428 }
429
430 static int is_device_busy(struct comedi_device *dev)
431 {
432 struct comedi_subdevice *s;
433 int i;
434
435 if (!dev->attached)
436 return 0;
437
438 for (i = 0; i < dev->n_subdevices; i++) {
439 s = &dev->subdevices[i];
440 if (s->busy)
441 return 1;
442 if (s->async && s->async->mmap_count)
443 return 1;
444 }
445
446 return 0;
447 }
448
449 /*
450 COMEDI_DEVCONFIG
451 device config ioctl
452
453 arg:
454 pointer to devconfig structure
455
456 reads:
457 devconfig structure at arg
458
459 writes:
460 none
461 */
462 static int do_devconfig_ioctl(struct comedi_device *dev,
463 struct comedi_devconfig __user *arg)
464 {
465 struct comedi_devconfig it;
466 int ret;
467
468 if (!capable(CAP_SYS_ADMIN))
469 return -EPERM;
470
471 if (arg == NULL) {
472 if (is_device_busy(dev))
473 return -EBUSY;
474 if (dev->attached) {
475 struct module *driver_module = dev->driver->module;
476 comedi_device_detach(dev);
477 module_put(driver_module);
478 }
479 return 0;
480 }
481
482 if (copy_from_user(&it, arg, sizeof(it)))
483 return -EFAULT;
484
485 it.board_name[COMEDI_NAMELEN - 1] = 0;
486
487 if (it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) {
488 dev_warn(dev->class_dev,
489 "comedi_config --init_data is deprecated\n");
490 return -EINVAL;
491 }
492
493 ret = comedi_device_attach(dev, &it);
494 if (ret == 0) {
495 if (!try_module_get(dev->driver->module)) {
496 comedi_device_detach(dev);
497 ret = -ENOSYS;
498 }
499 }
500
501 return ret;
502 }
503
504 /*
505 COMEDI_BUFCONFIG
506 buffer configuration ioctl
507
508 arg:
509 pointer to bufconfig structure
510
511 reads:
512 bufconfig at arg
513
514 writes:
515 modified bufconfig at arg
516
517 */
518 static int do_bufconfig_ioctl(struct comedi_device *dev,
519 struct comedi_bufconfig __user *arg)
520 {
521 struct comedi_bufconfig bc;
522 struct comedi_async *async;
523 struct comedi_subdevice *s;
524 int retval = 0;
525
526 if (copy_from_user(&bc, arg, sizeof(bc)))
527 return -EFAULT;
528
529 if (bc.subdevice >= dev->n_subdevices || bc.subdevice < 0)
530 return -EINVAL;
531
532 s = &dev->subdevices[bc.subdevice];
533 async = s->async;
534
535 if (!async) {
536 DPRINTK("subdevice does not have async capability\n");
537 bc.size = 0;
538 bc.maximum_size = 0;
539 goto copyback;
540 }
541
542 if (bc.maximum_size) {
543 if (!capable(CAP_SYS_ADMIN))
544 return -EPERM;
545
546 async->max_bufsize = bc.maximum_size;
547 }
548
549 if (bc.size) {
550 retval = resize_async_buffer(dev, s, async, bc.size);
551 if (retval < 0)
552 return retval;
553 }
554
555 bc.size = async->prealloc_bufsz;
556 bc.maximum_size = async->max_bufsize;
557
558 copyback:
559 if (copy_to_user(arg, &bc, sizeof(bc)))
560 return -EFAULT;
561
562 return 0;
563 }
564
565 /*
566 COMEDI_DEVINFO
567 device info ioctl
568
569 arg:
570 pointer to devinfo structure
571
572 reads:
573 none
574
575 writes:
576 devinfo structure
577
578 */
579 static int do_devinfo_ioctl(struct comedi_device *dev,
580 struct comedi_devinfo __user *arg,
581 struct file *file)
582 {
583 const unsigned minor = iminor(file->f_dentry->d_inode);
584 struct comedi_file_info *info = comedi_file_info_from_minor(minor);
585 struct comedi_subdevice *s;
586 struct comedi_devinfo devinfo;
587
588 memset(&devinfo, 0, sizeof(devinfo));
589
590 /* fill devinfo structure */
591 devinfo.version_code = COMEDI_VERSION_CODE;
592 devinfo.n_subdevs = dev->n_subdevices;
593 strlcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN);
594 strlcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN);
595
596 s = comedi_read_subdevice(info);
597 if (s)
598 devinfo.read_subdevice = s->index;
599 else
600 devinfo.read_subdevice = -1;
601
602 s = comedi_write_subdevice(info);
603 if (s)
604 devinfo.write_subdevice = s->index;
605 else
606 devinfo.write_subdevice = -1;
607
608 if (copy_to_user(arg, &devinfo, sizeof(devinfo)))
609 return -EFAULT;
610
611 return 0;
612 }
613
614 /*
615 COMEDI_SUBDINFO
616 subdevice info ioctl
617
618 arg:
619 pointer to array of subdevice info structures
620
621 reads:
622 none
623
624 writes:
625 array of subdevice info structures at arg
626
627 */
628 static int do_subdinfo_ioctl(struct comedi_device *dev,
629 struct comedi_subdinfo __user *arg, void *file)
630 {
631 int ret, i;
632 struct comedi_subdinfo *tmp, *us;
633 struct comedi_subdevice *s;
634
635 tmp = kcalloc(dev->n_subdevices, sizeof(*tmp), GFP_KERNEL);
636 if (!tmp)
637 return -ENOMEM;
638
639 /* fill subdinfo structs */
640 for (i = 0; i < dev->n_subdevices; i++) {
641 s = &dev->subdevices[i];
642 us = tmp + i;
643
644 us->type = s->type;
645 us->n_chan = s->n_chan;
646 us->subd_flags = s->subdev_flags;
647 if (comedi_is_subdevice_running(s))
648 us->subd_flags |= SDF_RUNNING;
649 #define TIMER_nanosec 5 /* backwards compatibility */
650 us->timer_type = TIMER_nanosec;
651 us->len_chanlist = s->len_chanlist;
652 us->maxdata = s->maxdata;
653 if (s->range_table) {
654 us->range_type =
655 (i << 24) | (0 << 16) | (s->range_table->length);
656 } else {
657 us->range_type = 0; /* XXX */
658 }
659 us->flags = s->flags;
660
661 if (s->busy)
662 us->subd_flags |= SDF_BUSY;
663 if (s->busy == file)
664 us->subd_flags |= SDF_BUSY_OWNER;
665 if (s->lock)
666 us->subd_flags |= SDF_LOCKED;
667 if (s->lock == file)
668 us->subd_flags |= SDF_LOCK_OWNER;
669 if (!s->maxdata && s->maxdata_list)
670 us->subd_flags |= SDF_MAXDATA;
671 if (s->flaglist)
672 us->subd_flags |= SDF_FLAGS;
673 if (s->range_table_list)
674 us->subd_flags |= SDF_RANGETYPE;
675 if (s->do_cmd)
676 us->subd_flags |= SDF_CMD;
677
678 if (s->insn_bits != &insn_inval)
679 us->insn_bits_support = COMEDI_SUPPORTED;
680 else
681 us->insn_bits_support = COMEDI_UNSUPPORTED;
682
683 us->settling_time_0 = s->settling_time_0;
684 }
685
686 ret = copy_to_user(arg, tmp, dev->n_subdevices * sizeof(*tmp));
687
688 kfree(tmp);
689
690 return ret ? -EFAULT : 0;
691 }
692
693 /*
694 COMEDI_CHANINFO
695 subdevice info ioctl
696
697 arg:
698 pointer to chaninfo structure
699
700 reads:
701 chaninfo structure at arg
702
703 writes:
704 arrays at elements of chaninfo structure
705
706 */
707 static int do_chaninfo_ioctl(struct comedi_device *dev,
708 struct comedi_chaninfo __user *arg)
709 {
710 struct comedi_subdevice *s;
711 struct comedi_chaninfo it;
712
713 if (copy_from_user(&it, arg, sizeof(it)))
714 return -EFAULT;
715
716 if (it.subdev >= dev->n_subdevices)
717 return -EINVAL;
718 s = &dev->subdevices[it.subdev];
719
720 if (it.maxdata_list) {
721 if (s->maxdata || !s->maxdata_list)
722 return -EINVAL;
723 if (copy_to_user(it.maxdata_list, s->maxdata_list,
724 s->n_chan * sizeof(unsigned int)))
725 return -EFAULT;
726 }
727
728 if (it.flaglist) {
729 if (!s->flaglist)
730 return -EINVAL;
731 if (copy_to_user(it.flaglist, s->flaglist,
732 s->n_chan * sizeof(unsigned int)))
733 return -EFAULT;
734 }
735
736 if (it.rangelist) {
737 int i;
738
739 if (!s->range_table_list)
740 return -EINVAL;
741 for (i = 0; i < s->n_chan; i++) {
742 int x;
743
744 x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) |
745 (s->range_table_list[i]->length);
746 if (put_user(x, it.rangelist + i))
747 return -EFAULT;
748 }
749 #if 0
750 if (copy_to_user(it.rangelist, s->range_type_list,
751 s->n_chan * sizeof(unsigned int)))
752 return -EFAULT;
753 #endif
754 }
755
756 return 0;
757 }
758
759 /*
760 COMEDI_BUFINFO
761 buffer information ioctl
762
763 arg:
764 pointer to bufinfo structure
765
766 reads:
767 bufinfo at arg
768
769 writes:
770 modified bufinfo at arg
771
772 */
773 static int do_bufinfo_ioctl(struct comedi_device *dev,
774 struct comedi_bufinfo __user *arg, void *file)
775 {
776 struct comedi_bufinfo bi;
777 struct comedi_subdevice *s;
778 struct comedi_async *async;
779
780 if (copy_from_user(&bi, arg, sizeof(bi)))
781 return -EFAULT;
782
783 if (bi.subdevice >= dev->n_subdevices || bi.subdevice < 0)
784 return -EINVAL;
785
786 s = &dev->subdevices[bi.subdevice];
787
788 if (s->lock && s->lock != file)
789 return -EACCES;
790
791 async = s->async;
792
793 if (!async) {
794 DPRINTK("subdevice does not have async capability\n");
795 bi.buf_write_ptr = 0;
796 bi.buf_read_ptr = 0;
797 bi.buf_write_count = 0;
798 bi.buf_read_count = 0;
799 bi.bytes_read = 0;
800 bi.bytes_written = 0;
801 goto copyback;
802 }
803 if (!s->busy) {
804 bi.bytes_read = 0;
805 bi.bytes_written = 0;
806 goto copyback_position;
807 }
808 if (s->busy != file)
809 return -EACCES;
810
811 if (bi.bytes_read && (s->subdev_flags & SDF_CMD_READ)) {
812 bi.bytes_read = comedi_buf_read_alloc(async, bi.bytes_read);
813 comedi_buf_read_free(async, bi.bytes_read);
814
815 if (comedi_is_subdevice_idle(s) &&
816 async->buf_write_count == async->buf_read_count) {
817 do_become_nonbusy(dev, s);
818 }
819 }
820
821 if (bi.bytes_written && (s->subdev_flags & SDF_CMD_WRITE)) {
822 bi.bytes_written =
823 comedi_buf_write_alloc(async, bi.bytes_written);
824 comedi_buf_write_free(async, bi.bytes_written);
825 }
826
827 copyback_position:
828 bi.buf_write_count = async->buf_write_count;
829 bi.buf_write_ptr = async->buf_write_ptr;
830 bi.buf_read_count = async->buf_read_count;
831 bi.buf_read_ptr = async->buf_read_ptr;
832
833 copyback:
834 if (copy_to_user(arg, &bi, sizeof(bi)))
835 return -EFAULT;
836
837 return 0;
838 }
839
840 static int check_insn_config_length(struct comedi_insn *insn,
841 unsigned int *data)
842 {
843 if (insn->n < 1)
844 return -EINVAL;
845
846 switch (data[0]) {
847 case INSN_CONFIG_DIO_OUTPUT:
848 case INSN_CONFIG_DIO_INPUT:
849 case INSN_CONFIG_DISARM:
850 case INSN_CONFIG_RESET:
851 if (insn->n == 1)
852 return 0;
853 break;
854 case INSN_CONFIG_ARM:
855 case INSN_CONFIG_DIO_QUERY:
856 case INSN_CONFIG_BLOCK_SIZE:
857 case INSN_CONFIG_FILTER:
858 case INSN_CONFIG_SERIAL_CLOCK:
859 case INSN_CONFIG_BIDIRECTIONAL_DATA:
860 case INSN_CONFIG_ALT_SOURCE:
861 case INSN_CONFIG_SET_COUNTER_MODE:
862 case INSN_CONFIG_8254_READ_STATUS:
863 case INSN_CONFIG_SET_ROUTING:
864 case INSN_CONFIG_GET_ROUTING:
865 case INSN_CONFIG_GET_PWM_STATUS:
866 case INSN_CONFIG_PWM_SET_PERIOD:
867 case INSN_CONFIG_PWM_GET_PERIOD:
868 if (insn->n == 2)
869 return 0;
870 break;
871 case INSN_CONFIG_SET_GATE_SRC:
872 case INSN_CONFIG_GET_GATE_SRC:
873 case INSN_CONFIG_SET_CLOCK_SRC:
874 case INSN_CONFIG_GET_CLOCK_SRC:
875 case INSN_CONFIG_SET_OTHER_SRC:
876 case INSN_CONFIG_GET_COUNTER_STATUS:
877 case INSN_CONFIG_PWM_SET_H_BRIDGE:
878 case INSN_CONFIG_PWM_GET_H_BRIDGE:
879 case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE:
880 if (insn->n == 3)
881 return 0;
882 break;
883 case INSN_CONFIG_PWM_OUTPUT:
884 case INSN_CONFIG_ANALOG_TRIG:
885 if (insn->n == 5)
886 return 0;
887 break;
888 case INSN_CONFIG_DIGITAL_TRIG:
889 if (insn->n == 6)
890 return 0;
891 break;
892 /* by default we allow the insn since we don't have checks for
893 * all possible cases yet */
894 default:
895 pr_warn("comedi: No check for data length of config insn id %i is implemented.\n",
896 data[0]);
897 pr_warn("comedi: Add a check to %s in %s.\n",
898 __func__, __FILE__);
899 pr_warn("comedi: Assuming n=%i is correct.\n", insn->n);
900 return 0;
901 }
902 return -EINVAL;
903 }
904
905 static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn,
906 unsigned int *data, void *file)
907 {
908 struct comedi_subdevice *s;
909 int ret = 0;
910 int i;
911
912 if (insn->insn & INSN_MASK_SPECIAL) {
913 /* a non-subdevice instruction */
914
915 switch (insn->insn) {
916 case INSN_GTOD:
917 {
918 struct timeval tv;
919
920 if (insn->n != 2) {
921 ret = -EINVAL;
922 break;
923 }
924
925 do_gettimeofday(&tv);
926 data[0] = tv.tv_sec;
927 data[1] = tv.tv_usec;
928 ret = 2;
929
930 break;
931 }
932 case INSN_WAIT:
933 if (insn->n != 1 || data[0] >= 100000) {
934 ret = -EINVAL;
935 break;
936 }
937 udelay(data[0] / 1000);
938 ret = 1;
939 break;
940 case INSN_INTTRIG:
941 if (insn->n != 1) {
942 ret = -EINVAL;
943 break;
944 }
945 if (insn->subdev >= dev->n_subdevices) {
946 DPRINTK("%d not usable subdevice\n",
947 insn->subdev);
948 ret = -EINVAL;
949 break;
950 }
951 s = &dev->subdevices[insn->subdev];
952 if (!s->async) {
953 DPRINTK("no async\n");
954 ret = -EINVAL;
955 break;
956 }
957 if (!s->async->inttrig) {
958 DPRINTK("no inttrig\n");
959 ret = -EAGAIN;
960 break;
961 }
962 ret = s->async->inttrig(dev, s, data[0]);
963 if (ret >= 0)
964 ret = 1;
965 break;
966 default:
967 DPRINTK("invalid insn\n");
968 ret = -EINVAL;
969 break;
970 }
971 } else {
972 /* a subdevice instruction */
973 unsigned int maxdata;
974
975 if (insn->subdev >= dev->n_subdevices) {
976 DPRINTK("subdevice %d out of range\n", insn->subdev);
977 ret = -EINVAL;
978 goto out;
979 }
980 s = &dev->subdevices[insn->subdev];
981
982 if (s->type == COMEDI_SUBD_UNUSED) {
983 DPRINTK("%d not usable subdevice\n", insn->subdev);
984 ret = -EIO;
985 goto out;
986 }
987
988 /* are we locked? (ioctl lock) */
989 if (s->lock && s->lock != file) {
990 DPRINTK("device locked\n");
991 ret = -EACCES;
992 goto out;
993 }
994
995 ret = comedi_check_chanlist(s, 1, &insn->chanspec);
996 if (ret < 0) {
997 ret = -EINVAL;
998 DPRINTK("bad chanspec\n");
999 goto out;
1000 }
1001
1002 if (s->busy) {
1003 ret = -EBUSY;
1004 goto out;
1005 }
1006 /* This looks arbitrary. It is. */
1007 s->busy = &parse_insn;
1008 switch (insn->insn) {
1009 case INSN_READ:
1010 ret = s->insn_read(dev, s, insn, data);
1011 break;
1012 case INSN_WRITE:
1013 maxdata = s->maxdata_list
1014 ? s->maxdata_list[CR_CHAN(insn->chanspec)]
1015 : s->maxdata;
1016 for (i = 0; i < insn->n; ++i) {
1017 if (data[i] > maxdata) {
1018 ret = -EINVAL;
1019 DPRINTK("bad data value(s)\n");
1020 break;
1021 }
1022 }
1023 if (ret == 0)
1024 ret = s->insn_write(dev, s, insn, data);
1025 break;
1026 case INSN_BITS:
1027 if (insn->n != 2) {
1028 ret = -EINVAL;
1029 } else {
1030 /* Most drivers ignore the base channel in
1031 * insn->chanspec. Fix this here if
1032 * the subdevice has <= 32 channels. */
1033 unsigned int shift;
1034 unsigned int orig_mask;
1035
1036 orig_mask = data[0];
1037 if (s->n_chan <= 32) {
1038 shift = CR_CHAN(insn->chanspec);
1039 if (shift > 0) {
1040 insn->chanspec = 0;
1041 data[0] <<= shift;
1042 data[1] <<= shift;
1043 }
1044 } else
1045 shift = 0;
1046 ret = s->insn_bits(dev, s, insn, data);
1047 data[0] = orig_mask;
1048 if (shift > 0)
1049 data[1] >>= shift;
1050 }
1051 break;
1052 case INSN_CONFIG:
1053 ret = check_insn_config_length(insn, data);
1054 if (ret)
1055 break;
1056 ret = s->insn_config(dev, s, insn, data);
1057 break;
1058 default:
1059 ret = -EINVAL;
1060 break;
1061 }
1062
1063 s->busy = NULL;
1064 }
1065
1066 out:
1067 return ret;
1068 }
1069
1070 /*
1071 * COMEDI_INSNLIST
1072 * synchronous instructions
1073 *
1074 * arg:
1075 * pointer to sync cmd structure
1076 *
1077 * reads:
1078 * sync cmd struct at arg
1079 * instruction list
1080 * data (for writes)
1081 *
1082 * writes:
1083 * data (for reads)
1084 */
1085 /* arbitrary limits */
1086 #define MAX_SAMPLES 256
1087 static int do_insnlist_ioctl(struct comedi_device *dev,
1088 struct comedi_insnlist __user *arg, void *file)
1089 {
1090 struct comedi_insnlist insnlist;
1091 struct comedi_insn *insns = NULL;
1092 unsigned int *data = NULL;
1093 int i = 0;
1094 int ret = 0;
1095
1096 if (copy_from_user(&insnlist, arg, sizeof(insnlist)))
1097 return -EFAULT;
1098
1099 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL);
1100 if (!data) {
1101 DPRINTK("kmalloc failed\n");
1102 ret = -ENOMEM;
1103 goto error;
1104 }
1105
1106 insns = kcalloc(insnlist.n_insns, sizeof(*insns), GFP_KERNEL);
1107 if (!insns) {
1108 DPRINTK("kmalloc failed\n");
1109 ret = -ENOMEM;
1110 goto error;
1111 }
1112
1113 if (copy_from_user(insns, insnlist.insns,
1114 sizeof(*insns) * insnlist.n_insns)) {
1115 DPRINTK("copy_from_user failed\n");
1116 ret = -EFAULT;
1117 goto error;
1118 }
1119
1120 for (i = 0; i < insnlist.n_insns; i++) {
1121 if (insns[i].n > MAX_SAMPLES) {
1122 DPRINTK("number of samples too large\n");
1123 ret = -EINVAL;
1124 goto error;
1125 }
1126 if (insns[i].insn & INSN_MASK_WRITE) {
1127 if (copy_from_user(data, insns[i].data,
1128 insns[i].n * sizeof(unsigned int))) {
1129 DPRINTK("copy_from_user failed\n");
1130 ret = -EFAULT;
1131 goto error;
1132 }
1133 }
1134 ret = parse_insn(dev, insns + i, data, file);
1135 if (ret < 0)
1136 goto error;
1137 if (insns[i].insn & INSN_MASK_READ) {
1138 if (copy_to_user(insns[i].data, data,
1139 insns[i].n * sizeof(unsigned int))) {
1140 DPRINTK("copy_to_user failed\n");
1141 ret = -EFAULT;
1142 goto error;
1143 }
1144 }
1145 if (need_resched())
1146 schedule();
1147 }
1148
1149 error:
1150 kfree(insns);
1151 kfree(data);
1152
1153 if (ret < 0)
1154 return ret;
1155 return i;
1156 }
1157
1158 /*
1159 * COMEDI_INSN
1160 * synchronous instructions
1161 *
1162 * arg:
1163 * pointer to insn
1164 *
1165 * reads:
1166 * struct comedi_insn struct at arg
1167 * data (for writes)
1168 *
1169 * writes:
1170 * data (for reads)
1171 */
1172 static int do_insn_ioctl(struct comedi_device *dev,
1173 struct comedi_insn __user *arg, void *file)
1174 {
1175 struct comedi_insn insn;
1176 unsigned int *data = NULL;
1177 int ret = 0;
1178
1179 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL);
1180 if (!data) {
1181 ret = -ENOMEM;
1182 goto error;
1183 }
1184
1185 if (copy_from_user(&insn, arg, sizeof(insn))) {
1186 ret = -EFAULT;
1187 goto error;
1188 }
1189
1190 /* This is where the behavior of insn and insnlist deviate. */
1191 if (insn.n > MAX_SAMPLES)
1192 insn.n = MAX_SAMPLES;
1193 if (insn.insn & INSN_MASK_WRITE) {
1194 if (copy_from_user(data,
1195 insn.data,
1196 insn.n * sizeof(unsigned int))) {
1197 ret = -EFAULT;
1198 goto error;
1199 }
1200 }
1201 ret = parse_insn(dev, &insn, data, file);
1202 if (ret < 0)
1203 goto error;
1204 if (insn.insn & INSN_MASK_READ) {
1205 if (copy_to_user(insn.data,
1206 data,
1207 insn.n * sizeof(unsigned int))) {
1208 ret = -EFAULT;
1209 goto error;
1210 }
1211 }
1212 ret = insn.n;
1213
1214 error:
1215 kfree(data);
1216
1217 return ret;
1218 }
1219
1220 static int do_cmd_ioctl(struct comedi_device *dev,
1221 struct comedi_cmd __user *arg, void *file)
1222 {
1223 struct comedi_cmd cmd;
1224 struct comedi_subdevice *s;
1225 struct comedi_async *async;
1226 int ret = 0;
1227 unsigned int __user *user_chanlist;
1228
1229 if (copy_from_user(&cmd, arg, sizeof(cmd))) {
1230 DPRINTK("bad cmd address\n");
1231 return -EFAULT;
1232 }
1233 /* save user's chanlist pointer so it can be restored later */
1234 user_chanlist = (unsigned int __user *)cmd.chanlist;
1235
1236 if (cmd.subdev >= dev->n_subdevices) {
1237 DPRINTK("%d no such subdevice\n", cmd.subdev);
1238 return -ENODEV;
1239 }
1240
1241 s = &dev->subdevices[cmd.subdev];
1242 async = s->async;
1243
1244 if (s->type == COMEDI_SUBD_UNUSED) {
1245 DPRINTK("%d not valid subdevice\n", cmd.subdev);
1246 return -EIO;
1247 }
1248
1249 if (!s->do_cmd || !s->do_cmdtest || !s->async) {
1250 DPRINTK("subdevice %i does not support commands\n",
1251 cmd.subdev);
1252 return -EIO;
1253 }
1254
1255 /* are we locked? (ioctl lock) */
1256 if (s->lock && s->lock != file) {
1257 DPRINTK("subdevice locked\n");
1258 return -EACCES;
1259 }
1260
1261 /* are we busy? */
1262 if (s->busy) {
1263 DPRINTK("subdevice busy\n");
1264 return -EBUSY;
1265 }
1266 s->busy = file;
1267
1268 /* make sure channel/gain list isn't too long */
1269 if (cmd.chanlist_len > s->len_chanlist) {
1270 DPRINTK("channel/gain list too long %u > %d\n",
1271 cmd.chanlist_len, s->len_chanlist);
1272 ret = -EINVAL;
1273 goto cleanup;
1274 }
1275
1276 /* make sure channel/gain list isn't too short */
1277 if (cmd.chanlist_len < 1) {
1278 DPRINTK("channel/gain list too short %u < 1\n",
1279 cmd.chanlist_len);
1280 ret = -EINVAL;
1281 goto cleanup;
1282 }
1283
1284 async->cmd = cmd;
1285 async->cmd.data = NULL;
1286 /* load channel/gain list */
1287 async->cmd.chanlist =
1288 kmalloc(async->cmd.chanlist_len * sizeof(int), GFP_KERNEL);
1289 if (!async->cmd.chanlist) {
1290 DPRINTK("allocation failed\n");
1291 ret = -ENOMEM;
1292 goto cleanup;
1293 }
1294
1295 if (copy_from_user(async->cmd.chanlist, user_chanlist,
1296 async->cmd.chanlist_len * sizeof(int))) {
1297 DPRINTK("fault reading chanlist\n");
1298 ret = -EFAULT;
1299 goto cleanup;
1300 }
1301
1302 /* make sure each element in channel/gain list is valid */
1303 ret = comedi_check_chanlist(s,
1304 async->cmd.chanlist_len,
1305 async->cmd.chanlist);
1306 if (ret < 0) {
1307 DPRINTK("bad chanlist\n");
1308 goto cleanup;
1309 }
1310
1311 ret = s->do_cmdtest(dev, s, &async->cmd);
1312
1313 if (async->cmd.flags & TRIG_BOGUS || ret) {
1314 DPRINTK("test returned %d\n", ret);
1315 cmd = async->cmd;
1316 /* restore chanlist pointer before copying back */
1317 cmd.chanlist = (unsigned int __force *)user_chanlist;
1318 cmd.data = NULL;
1319 if (copy_to_user(arg, &cmd, sizeof(cmd))) {
1320 DPRINTK("fault writing cmd\n");
1321 ret = -EFAULT;
1322 goto cleanup;
1323 }
1324 ret = -EAGAIN;
1325 goto cleanup;
1326 }
1327
1328 if (!async->prealloc_bufsz) {
1329 ret = -ENOMEM;
1330 DPRINTK("no buffer (?)\n");
1331 goto cleanup;
1332 }
1333
1334 comedi_buf_reset(async);
1335
1336 async->cb_mask =
1337 COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR |
1338 COMEDI_CB_OVERFLOW;
1339 if (async->cmd.flags & TRIG_WAKE_EOS)
1340 async->cb_mask |= COMEDI_CB_EOS;
1341
1342 comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING);
1343
1344 ret = s->do_cmd(dev, s);
1345 if (ret == 0)
1346 return 0;
1347
1348 cleanup:
1349 do_become_nonbusy(dev, s);
1350
1351 return ret;
1352 }
1353
1354 /*
1355 COMEDI_CMDTEST
1356 command testing ioctl
1357
1358 arg:
1359 pointer to cmd structure
1360
1361 reads:
1362 cmd structure at arg
1363 channel/range list
1364
1365 writes:
1366 modified cmd structure at arg
1367
1368 */
1369 static int do_cmdtest_ioctl(struct comedi_device *dev,
1370 struct comedi_cmd __user *arg, void *file)
1371 {
1372 struct comedi_cmd cmd;
1373 struct comedi_subdevice *s;
1374 int ret = 0;
1375 unsigned int *chanlist = NULL;
1376 unsigned int __user *user_chanlist;
1377
1378 if (copy_from_user(&cmd, arg, sizeof(cmd))) {
1379 DPRINTK("bad cmd address\n");
1380 return -EFAULT;
1381 }
1382 /* save user's chanlist pointer so it can be restored later */
1383 user_chanlist = (unsigned int __user *)cmd.chanlist;
1384
1385 if (cmd.subdev >= dev->n_subdevices) {
1386 DPRINTK("%d no such subdevice\n", cmd.subdev);
1387 return -ENODEV;
1388 }
1389
1390 s = &dev->subdevices[cmd.subdev];
1391 if (s->type == COMEDI_SUBD_UNUSED) {
1392 DPRINTK("%d not valid subdevice\n", cmd.subdev);
1393 return -EIO;
1394 }
1395
1396 if (!s->do_cmd || !s->do_cmdtest) {
1397 DPRINTK("subdevice %i does not support commands\n",
1398 cmd.subdev);
1399 return -EIO;
1400 }
1401
1402 /* make sure channel/gain list isn't too long */
1403 if (cmd.chanlist_len > s->len_chanlist) {
1404 DPRINTK("channel/gain list too long %d > %d\n",
1405 cmd.chanlist_len, s->len_chanlist);
1406 ret = -EINVAL;
1407 goto cleanup;
1408 }
1409
1410 /* load channel/gain list */
1411 if (cmd.chanlist) {
1412 chanlist =
1413 kmalloc(cmd.chanlist_len * sizeof(int), GFP_KERNEL);
1414 if (!chanlist) {
1415 DPRINTK("allocation failed\n");
1416 ret = -ENOMEM;
1417 goto cleanup;
1418 }
1419
1420 if (copy_from_user(chanlist, user_chanlist,
1421 cmd.chanlist_len * sizeof(int))) {
1422 DPRINTK("fault reading chanlist\n");
1423 ret = -EFAULT;
1424 goto cleanup;
1425 }
1426
1427 /* make sure each element in channel/gain list is valid */
1428 ret = comedi_check_chanlist(s, cmd.chanlist_len, chanlist);
1429 if (ret < 0) {
1430 DPRINTK("bad chanlist\n");
1431 goto cleanup;
1432 }
1433
1434 cmd.chanlist = chanlist;
1435 }
1436
1437 ret = s->do_cmdtest(dev, s, &cmd);
1438
1439 /* restore chanlist pointer before copying back */
1440 cmd.chanlist = (unsigned int __force *)user_chanlist;
1441
1442 if (copy_to_user(arg, &cmd, sizeof(cmd))) {
1443 DPRINTK("bad cmd address\n");
1444 ret = -EFAULT;
1445 goto cleanup;
1446 }
1447 cleanup:
1448 kfree(chanlist);
1449
1450 return ret;
1451 }
1452
1453 /*
1454 COMEDI_LOCK
1455 lock subdevice
1456
1457 arg:
1458 subdevice number
1459
1460 reads:
1461 none
1462
1463 writes:
1464 none
1465
1466 */
1467
1468 static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg,
1469 void *file)
1470 {
1471 int ret = 0;
1472 unsigned long flags;
1473 struct comedi_subdevice *s;
1474
1475 if (arg >= dev->n_subdevices)
1476 return -EINVAL;
1477 s = &dev->subdevices[arg];
1478
1479 spin_lock_irqsave(&s->spin_lock, flags);
1480 if (s->busy || s->lock)
1481 ret = -EBUSY;
1482 else
1483 s->lock = file;
1484 spin_unlock_irqrestore(&s->spin_lock, flags);
1485
1486 #if 0
1487 if (ret < 0)
1488 return ret;
1489
1490 if (s->lock_f)
1491 ret = s->lock_f(dev, s);
1492 #endif
1493
1494 return ret;
1495 }
1496
1497 /*
1498 COMEDI_UNLOCK
1499 unlock subdevice
1500
1501 arg:
1502 subdevice number
1503
1504 reads:
1505 none
1506
1507 writes:
1508 none
1509
1510 This function isn't protected by the semaphore, since
1511 we already own the lock.
1512 */
1513 static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg,
1514 void *file)
1515 {
1516 struct comedi_subdevice *s;
1517
1518 if (arg >= dev->n_subdevices)
1519 return -EINVAL;
1520 s = &dev->subdevices[arg];
1521
1522 if (s->busy)
1523 return -EBUSY;
1524
1525 if (s->lock && s->lock != file)
1526 return -EACCES;
1527
1528 if (s->lock == file) {
1529 #if 0
1530 if (s->unlock)
1531 s->unlock(dev, s);
1532 #endif
1533
1534 s->lock = NULL;
1535 }
1536
1537 return 0;
1538 }
1539
1540 /*
1541 COMEDI_CANCEL
1542 cancel acquisition ioctl
1543
1544 arg:
1545 subdevice number
1546
1547 reads:
1548 nothing
1549
1550 writes:
1551 nothing
1552
1553 */
1554 static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg,
1555 void *file)
1556 {
1557 struct comedi_subdevice *s;
1558
1559 if (arg >= dev->n_subdevices)
1560 return -EINVAL;
1561 s = &dev->subdevices[arg];
1562 if (s->async == NULL)
1563 return -EINVAL;
1564
1565 if (s->lock && s->lock != file)
1566 return -EACCES;
1567
1568 if (!s->busy)
1569 return 0;
1570
1571 if (s->busy != file)
1572 return -EBUSY;
1573
1574 return do_cancel(dev, s);
1575 }
1576
1577 /*
1578 COMEDI_POLL ioctl
1579 instructs driver to synchronize buffers
1580
1581 arg:
1582 subdevice number
1583
1584 reads:
1585 nothing
1586
1587 writes:
1588 nothing
1589
1590 */
1591 static int do_poll_ioctl(struct comedi_device *dev, unsigned int arg,
1592 void *file)
1593 {
1594 struct comedi_subdevice *s;
1595
1596 if (arg >= dev->n_subdevices)
1597 return -EINVAL;
1598 s = &dev->subdevices[arg];
1599
1600 if (s->lock && s->lock != file)
1601 return -EACCES;
1602
1603 if (!s->busy)
1604 return 0;
1605
1606 if (s->busy != file)
1607 return -EBUSY;
1608
1609 if (s->poll)
1610 return s->poll(dev, s);
1611
1612 return -EINVAL;
1613 }
1614
1615 static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd,
1616 unsigned long arg)
1617 {
1618 const unsigned minor = iminor(file->f_dentry->d_inode);
1619 struct comedi_file_info *info = comedi_file_info_from_minor(minor);
1620 struct comedi_device *dev = comedi_dev_from_file_info(info);
1621 int rc;
1622
1623 if (!dev)
1624 return -ENODEV;
1625
1626 mutex_lock(&dev->mutex);
1627
1628 /* Device config is special, because it must work on
1629 * an unconfigured device. */
1630 if (cmd == COMEDI_DEVCONFIG) {
1631 if (minor >= COMEDI_NUM_BOARD_MINORS) {
1632 /* Device config not appropriate on non-board minors. */
1633 rc = -ENOTTY;
1634 goto done;
1635 }
1636 rc = do_devconfig_ioctl(dev,
1637 (struct comedi_devconfig __user *)arg);
1638 if (rc == 0)
1639 /* Evade comedi_auto_unconfig(). */
1640 info->hardware_device = NULL;
1641 goto done;
1642 }
1643
1644 if (!dev->attached) {
1645 DPRINTK("no driver configured on /dev/comedi%i\n", dev->minor);
1646 rc = -ENODEV;
1647 goto done;
1648 }
1649
1650 switch (cmd) {
1651 case COMEDI_BUFCONFIG:
1652 rc = do_bufconfig_ioctl(dev,
1653 (struct comedi_bufconfig __user *)arg);
1654 break;
1655 case COMEDI_DEVINFO:
1656 rc = do_devinfo_ioctl(dev, (struct comedi_devinfo __user *)arg,
1657 file);
1658 break;
1659 case COMEDI_SUBDINFO:
1660 rc = do_subdinfo_ioctl(dev,
1661 (struct comedi_subdinfo __user *)arg,
1662 file);
1663 break;
1664 case COMEDI_CHANINFO:
1665 rc = do_chaninfo_ioctl(dev, (void __user *)arg);
1666 break;
1667 case COMEDI_RANGEINFO:
1668 rc = do_rangeinfo_ioctl(dev, (void __user *)arg);
1669 break;
1670 case COMEDI_BUFINFO:
1671 rc = do_bufinfo_ioctl(dev,
1672 (struct comedi_bufinfo __user *)arg,
1673 file);
1674 break;
1675 case COMEDI_LOCK:
1676 rc = do_lock_ioctl(dev, arg, file);
1677 break;
1678 case COMEDI_UNLOCK:
1679 rc = do_unlock_ioctl(dev, arg, file);
1680 break;
1681 case COMEDI_CANCEL:
1682 rc = do_cancel_ioctl(dev, arg, file);
1683 break;
1684 case COMEDI_CMD:
1685 rc = do_cmd_ioctl(dev, (struct comedi_cmd __user *)arg, file);
1686 break;
1687 case COMEDI_CMDTEST:
1688 rc = do_cmdtest_ioctl(dev, (struct comedi_cmd __user *)arg,
1689 file);
1690 break;
1691 case COMEDI_INSNLIST:
1692 rc = do_insnlist_ioctl(dev,
1693 (struct comedi_insnlist __user *)arg,
1694 file);
1695 break;
1696 case COMEDI_INSN:
1697 rc = do_insn_ioctl(dev, (struct comedi_insn __user *)arg,
1698 file);
1699 break;
1700 case COMEDI_POLL:
1701 rc = do_poll_ioctl(dev, arg, file);
1702 break;
1703 default:
1704 rc = -ENOTTY;
1705 break;
1706 }
1707
1708 done:
1709 mutex_unlock(&dev->mutex);
1710 return rc;
1711 }
1712
1713 static void comedi_vm_open(struct vm_area_struct *area)
1714 {
1715 struct comedi_async *async;
1716 struct comedi_device *dev;
1717
1718 async = area->vm_private_data;
1719 dev = async->subdevice->device;
1720
1721 mutex_lock(&dev->mutex);
1722 async->mmap_count++;
1723 mutex_unlock(&dev->mutex);
1724 }
1725
1726 static void comedi_vm_close(struct vm_area_struct *area)
1727 {
1728 struct comedi_async *async;
1729 struct comedi_device *dev;
1730
1731 async = area->vm_private_data;
1732 dev = async->subdevice->device;
1733
1734 mutex_lock(&dev->mutex);
1735 async->mmap_count--;
1736 mutex_unlock(&dev->mutex);
1737 }
1738
1739 static struct vm_operations_struct comedi_vm_ops = {
1740 .open = comedi_vm_open,
1741 .close = comedi_vm_close,
1742 };
1743
1744 static int comedi_mmap(struct file *file, struct vm_area_struct *vma)
1745 {
1746 const unsigned minor = iminor(file->f_dentry->d_inode);
1747 struct comedi_file_info *info = comedi_file_info_from_minor(minor);
1748 struct comedi_device *dev = comedi_dev_from_file_info(info);
1749 struct comedi_subdevice *s;
1750 struct comedi_async *async;
1751 unsigned long start = vma->vm_start;
1752 unsigned long size;
1753 int n_pages;
1754 int i;
1755 int retval;
1756
1757 if (!dev)
1758 return -ENODEV;
1759
1760 mutex_lock(&dev->mutex);
1761
1762 if (!dev->attached) {
1763 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1764 retval = -ENODEV;
1765 goto done;
1766 }
1767
1768 if (vma->vm_flags & VM_WRITE)
1769 s = comedi_write_subdevice(info);
1770 else
1771 s = comedi_read_subdevice(info);
1772 if (!s) {
1773 retval = -EINVAL;
1774 goto done;
1775 }
1776
1777 async = s->async;
1778 if (!async) {
1779 retval = -EINVAL;
1780 goto done;
1781 }
1782
1783 if (vma->vm_pgoff != 0) {
1784 DPRINTK("comedi: mmap() offset must be 0.\n");
1785 retval = -EINVAL;
1786 goto done;
1787 }
1788
1789 size = vma->vm_end - vma->vm_start;
1790 if (size > async->prealloc_bufsz) {
1791 retval = -EFAULT;
1792 goto done;
1793 }
1794 if (size & (~PAGE_MASK)) {
1795 retval = -EFAULT;
1796 goto done;
1797 }
1798
1799 n_pages = size >> PAGE_SHIFT;
1800 for (i = 0; i < n_pages; ++i) {
1801 struct comedi_buf_page *buf = &async->buf_page_list[i];
1802
1803 if (remap_pfn_range(vma, start,
1804 page_to_pfn(virt_to_page(buf->virt_addr)),
1805 PAGE_SIZE, PAGE_SHARED)) {
1806 retval = -EAGAIN;
1807 goto done;
1808 }
1809 start += PAGE_SIZE;
1810 }
1811
1812 vma->vm_ops = &comedi_vm_ops;
1813 vma->vm_private_data = async;
1814
1815 async->mmap_count++;
1816
1817 retval = 0;
1818 done:
1819 mutex_unlock(&dev->mutex);
1820 return retval;
1821 }
1822
1823 static unsigned int comedi_poll(struct file *file, poll_table *wait)
1824 {
1825 unsigned int mask = 0;
1826 const unsigned minor = iminor(file->f_dentry->d_inode);
1827 struct comedi_file_info *info = comedi_file_info_from_minor(minor);
1828 struct comedi_device *dev = comedi_dev_from_file_info(info);
1829 struct comedi_subdevice *s;
1830
1831 if (!dev)
1832 return -ENODEV;
1833
1834 mutex_lock(&dev->mutex);
1835
1836 if (!dev->attached) {
1837 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1838 goto done;
1839 }
1840
1841 s = comedi_read_subdevice(info);
1842 if (s && s->async) {
1843 poll_wait(file, &s->async->wait_head, wait);
1844 if (!s->busy || !comedi_is_subdevice_running(s) ||
1845 comedi_buf_read_n_available(s->async) > 0)
1846 mask |= POLLIN | POLLRDNORM;
1847 }
1848
1849 s = comedi_write_subdevice(info);
1850 if (s && s->async) {
1851 unsigned int bps = bytes_per_sample(s->async->subdevice);
1852
1853 poll_wait(file, &s->async->wait_head, wait);
1854 comedi_buf_write_alloc(s->async, s->async->prealloc_bufsz);
1855 if (!s->busy || !comedi_is_subdevice_running(s) ||
1856 comedi_buf_write_n_allocated(s->async) >= bps)
1857 mask |= POLLOUT | POLLWRNORM;
1858 }
1859
1860 done:
1861 mutex_unlock(&dev->mutex);
1862 return mask;
1863 }
1864
1865 static ssize_t comedi_write(struct file *file, const char __user *buf,
1866 size_t nbytes, loff_t *offset)
1867 {
1868 struct comedi_subdevice *s;
1869 struct comedi_async *async;
1870 int n, m, count = 0, retval = 0;
1871 DECLARE_WAITQUEUE(wait, current);
1872 const unsigned minor = iminor(file->f_dentry->d_inode);
1873 struct comedi_file_info *info = comedi_file_info_from_minor(minor);
1874 struct comedi_device *dev = comedi_dev_from_file_info(info);
1875
1876 if (!dev)
1877 return -ENODEV;
1878
1879 if (!dev->attached) {
1880 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1881 return -ENODEV;
1882 }
1883
1884 s = comedi_write_subdevice(info);
1885 if (!s || !s->async)
1886 return -EIO;
1887
1888 async = s->async;
1889
1890 if (!s->busy || !nbytes)
1891 return 0;
1892 if (s->busy != file)
1893 return -EACCES;
1894
1895 add_wait_queue(&async->wait_head, &wait);
1896 while (nbytes > 0 && !retval) {
1897 set_current_state(TASK_INTERRUPTIBLE);
1898
1899 if (!comedi_is_subdevice_running(s)) {
1900 if (count == 0) {
1901 if (comedi_is_subdevice_in_error(s))
1902 retval = -EPIPE;
1903 else
1904 retval = 0;
1905 do_become_nonbusy(dev, s);
1906 }
1907 break;
1908 }
1909
1910 n = nbytes;
1911
1912 m = n;
1913 if (async->buf_write_ptr + m > async->prealloc_bufsz)
1914 m = async->prealloc_bufsz - async->buf_write_ptr;
1915 comedi_buf_write_alloc(async, async->prealloc_bufsz);
1916 if (m > comedi_buf_write_n_allocated(async))
1917 m = comedi_buf_write_n_allocated(async);
1918 if (m < n)
1919 n = m;
1920
1921 if (n == 0) {
1922 if (file->f_flags & O_NONBLOCK) {
1923 retval = -EAGAIN;
1924 break;
1925 }
1926 schedule();
1927 if (signal_pending(current)) {
1928 retval = -ERESTARTSYS;
1929 break;
1930 }
1931 if (!s->busy)
1932 break;
1933 if (s->busy != file) {
1934 retval = -EACCES;
1935 break;
1936 }
1937 continue;
1938 }
1939
1940 m = copy_from_user(async->prealloc_buf + async->buf_write_ptr,
1941 buf, n);
1942 if (m) {
1943 n -= m;
1944 retval = -EFAULT;
1945 }
1946 comedi_buf_write_free(async, n);
1947
1948 count += n;
1949 nbytes -= n;
1950
1951 buf += n;
1952 break; /* makes device work like a pipe */
1953 }
1954 set_current_state(TASK_RUNNING);
1955 remove_wait_queue(&async->wait_head, &wait);
1956
1957 return count ? count : retval;
1958 }
1959
1960 static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes,
1961 loff_t *offset)
1962 {
1963 struct comedi_subdevice *s;
1964 struct comedi_async *async;
1965 int n, m, count = 0, retval = 0;
1966 DECLARE_WAITQUEUE(wait, current);
1967 const unsigned minor = iminor(file->f_dentry->d_inode);
1968 struct comedi_file_info *info = comedi_file_info_from_minor(minor);
1969 struct comedi_device *dev = comedi_dev_from_file_info(info);
1970
1971 if (!dev)
1972 return -ENODEV;
1973
1974 if (!dev->attached) {
1975 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1976 return -ENODEV;
1977 }
1978
1979 s = comedi_read_subdevice(info);
1980 if (!s || !s->async)
1981 return -EIO;
1982
1983 async = s->async;
1984 if (!s->busy || !nbytes)
1985 return 0;
1986 if (s->busy != file)
1987 return -EACCES;
1988
1989 add_wait_queue(&async->wait_head, &wait);
1990 while (nbytes > 0 && !retval) {
1991 set_current_state(TASK_INTERRUPTIBLE);
1992
1993 n = nbytes;
1994
1995 m = comedi_buf_read_n_available(async);
1996 /* printk("%d available\n",m); */
1997 if (async->buf_read_ptr + m > async->prealloc_bufsz)
1998 m = async->prealloc_bufsz - async->buf_read_ptr;
1999 /* printk("%d contiguous\n",m); */
2000 if (m < n)
2001 n = m;
2002
2003 if (n == 0) {
2004 if (!comedi_is_subdevice_running(s)) {
2005 do_become_nonbusy(dev, s);
2006 if (comedi_is_subdevice_in_error(s))
2007 retval = -EPIPE;
2008 else
2009 retval = 0;
2010 break;
2011 }
2012 if (file->f_flags & O_NONBLOCK) {
2013 retval = -EAGAIN;
2014 break;
2015 }
2016 schedule();
2017 if (signal_pending(current)) {
2018 retval = -ERESTARTSYS;
2019 break;
2020 }
2021 if (!s->busy) {
2022 retval = 0;
2023 break;
2024 }
2025 if (s->busy != file) {
2026 retval = -EACCES;
2027 break;
2028 }
2029 continue;
2030 }
2031 m = copy_to_user(buf, async->prealloc_buf +
2032 async->buf_read_ptr, n);
2033 if (m) {
2034 n -= m;
2035 retval = -EFAULT;
2036 }
2037
2038 comedi_buf_read_alloc(async, n);
2039 comedi_buf_read_free(async, n);
2040
2041 count += n;
2042 nbytes -= n;
2043
2044 buf += n;
2045 break; /* makes device work like a pipe */
2046 }
2047 if (comedi_is_subdevice_idle(s) &&
2048 async->buf_read_count - async->buf_write_count == 0) {
2049 do_become_nonbusy(dev, s);
2050 }
2051 set_current_state(TASK_RUNNING);
2052 remove_wait_queue(&async->wait_head, &wait);
2053
2054 return count ? count : retval;
2055 }
2056
2057 static int comedi_open(struct inode *inode, struct file *file)
2058 {
2059 const unsigned minor = iminor(inode);
2060 struct comedi_device *dev = comedi_dev_from_minor(minor);
2061
2062 if (!dev) {
2063 DPRINTK("invalid minor number\n");
2064 return -ENODEV;
2065 }
2066
2067 /* This is slightly hacky, but we want module autoloading
2068 * to work for root.
2069 * case: user opens device, attached -> ok
2070 * case: user opens device, unattached, in_request_module=0 -> autoload
2071 * case: user opens device, unattached, in_request_module=1 -> fail
2072 * case: root opens device, attached -> ok
2073 * case: root opens device, unattached, in_request_module=1 -> ok
2074 * (typically called from modprobe)
2075 * case: root opens device, unattached, in_request_module=0 -> autoload
2076 *
2077 * The last could be changed to "-> ok", which would deny root
2078 * autoloading.
2079 */
2080 mutex_lock(&dev->mutex);
2081 if (dev->attached)
2082 goto ok;
2083 if (!capable(CAP_NET_ADMIN) && dev->in_request_module) {
2084 DPRINTK("in request module\n");
2085 mutex_unlock(&dev->mutex);
2086 return -ENODEV;
2087 }
2088 if (capable(CAP_NET_ADMIN) && dev->in_request_module)
2089 goto ok;
2090
2091 dev->in_request_module = 1;
2092
2093 #ifdef CONFIG_KMOD
2094 mutex_unlock(&dev->mutex);
2095 request_module("char-major-%i-%i", COMEDI_MAJOR, dev->minor);
2096 mutex_lock(&dev->mutex);
2097 #endif
2098
2099 dev->in_request_module = 0;
2100
2101 if (!dev->attached && !capable(CAP_NET_ADMIN)) {
2102 DPRINTK("not attached and not CAP_NET_ADMIN\n");
2103 mutex_unlock(&dev->mutex);
2104 return -ENODEV;
2105 }
2106 ok:
2107 __module_get(THIS_MODULE);
2108
2109 if (dev->attached) {
2110 if (!try_module_get(dev->driver->module)) {
2111 module_put(THIS_MODULE);
2112 mutex_unlock(&dev->mutex);
2113 return -ENOSYS;
2114 }
2115 }
2116
2117 if (dev->attached && dev->use_count == 0 && dev->open) {
2118 int rc = dev->open(dev);
2119 if (rc < 0) {
2120 module_put(dev->driver->module);
2121 module_put(THIS_MODULE);
2122 mutex_unlock(&dev->mutex);
2123 return rc;
2124 }
2125 }
2126
2127 dev->use_count++;
2128
2129 mutex_unlock(&dev->mutex);
2130
2131 return 0;
2132 }
2133
2134 static int comedi_fasync(int fd, struct file *file, int on)
2135 {
2136 const unsigned minor = iminor(file->f_dentry->d_inode);
2137 struct comedi_device *dev = comedi_dev_from_minor(minor);
2138
2139 if (!dev)
2140 return -ENODEV;
2141
2142 return fasync_helper(fd, file, on, &dev->async_queue);
2143 }
2144
2145 static int comedi_close(struct inode *inode, struct file *file)
2146 {
2147 const unsigned minor = iminor(inode);
2148 struct comedi_device *dev = comedi_dev_from_minor(minor);
2149 struct comedi_subdevice *s = NULL;
2150 int i;
2151
2152 if (!dev)
2153 return -ENODEV;
2154
2155 mutex_lock(&dev->mutex);
2156
2157 if (dev->subdevices) {
2158 for (i = 0; i < dev->n_subdevices; i++) {
2159 s = &dev->subdevices[i];
2160
2161 if (s->busy == file)
2162 do_cancel(dev, s);
2163 if (s->lock == file)
2164 s->lock = NULL;
2165 }
2166 }
2167 if (dev->attached && dev->use_count == 1 && dev->close)
2168 dev->close(dev);
2169
2170 module_put(THIS_MODULE);
2171 if (dev->attached)
2172 module_put(dev->driver->module);
2173
2174 dev->use_count--;
2175
2176 mutex_unlock(&dev->mutex);
2177
2178 if (file->f_flags & FASYNC)
2179 comedi_fasync(-1, file, 0);
2180
2181 return 0;
2182 }
2183
2184 static const struct file_operations comedi_fops = {
2185 .owner = THIS_MODULE,
2186 .unlocked_ioctl = comedi_unlocked_ioctl,
2187 .compat_ioctl = comedi_compat_ioctl,
2188 .open = comedi_open,
2189 .release = comedi_close,
2190 .read = comedi_read,
2191 .write = comedi_write,
2192 .mmap = comedi_mmap,
2193 .poll = comedi_poll,
2194 .fasync = comedi_fasync,
2195 .llseek = noop_llseek,
2196 };
2197
2198 static struct class *comedi_class;
2199 static struct cdev comedi_cdev;
2200
2201 void comedi_error(const struct comedi_device *dev, const char *s)
2202 {
2203 dev_err(dev->class_dev, "%s: %s\n", dev->driver->driver_name, s);
2204 }
2205 EXPORT_SYMBOL(comedi_error);
2206
2207 void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s)
2208 {
2209 struct comedi_async *async = s->async;
2210 unsigned runflags = 0;
2211 unsigned runflags_mask = 0;
2212
2213 /* DPRINTK("comedi_event 0x%x\n",mask); */
2214
2215 if (!comedi_is_subdevice_running(s))
2216 return;
2217
2218 if (s->
2219 async->events & (COMEDI_CB_EOA | COMEDI_CB_ERROR |
2220 COMEDI_CB_OVERFLOW)) {
2221 runflags_mask |= SRF_RUNNING;
2222 }
2223 /* remember if an error event has occurred, so an error
2224 * can be returned the next time the user does a read() */
2225 if (s->async->events & (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) {
2226 runflags_mask |= SRF_ERROR;
2227 runflags |= SRF_ERROR;
2228 }
2229 if (runflags_mask) {
2230 /*sets SRF_ERROR and SRF_RUNNING together atomically */
2231 comedi_set_subdevice_runflags(s, runflags_mask, runflags);
2232 }
2233
2234 if (async->cb_mask & s->async->events) {
2235 if (comedi_get_subdevice_runflags(s) & SRF_USER) {
2236 wake_up_interruptible(&async->wait_head);
2237 if (s->subdev_flags & SDF_CMD_READ)
2238 kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
2239 if (s->subdev_flags & SDF_CMD_WRITE)
2240 kill_fasync(&dev->async_queue, SIGIO, POLL_OUT);
2241 } else {
2242 if (async->cb_func)
2243 async->cb_func(s->async->events, async->cb_arg);
2244 }
2245 }
2246 s->async->events = 0;
2247 }
2248 EXPORT_SYMBOL(comedi_event);
2249
2250 static void comedi_device_init(struct comedi_device *dev)
2251 {
2252 memset(dev, 0, sizeof(*dev));
2253 spin_lock_init(&dev->spinlock);
2254 mutex_init(&dev->mutex);
2255 dev->minor = -1;
2256 }
2257
2258 static void comedi_device_cleanup(struct comedi_device *dev)
2259 {
2260 if (dev == NULL)
2261 return;
2262 mutex_lock(&dev->mutex);
2263 comedi_device_detach(dev);
2264 mutex_unlock(&dev->mutex);
2265 mutex_destroy(&dev->mutex);
2266 }
2267
2268 int comedi_alloc_board_minor(struct device *hardware_device)
2269 {
2270 struct comedi_file_info *info;
2271 struct device *csdev;
2272 unsigned i;
2273
2274 info = kzalloc(sizeof(*info), GFP_KERNEL);
2275 if (info == NULL)
2276 return -ENOMEM;
2277 info->device = kzalloc(sizeof(struct comedi_device), GFP_KERNEL);
2278 if (info->device == NULL) {
2279 kfree(info);
2280 return -ENOMEM;
2281 }
2282 info->hardware_device = hardware_device;
2283 comedi_device_init(info->device);
2284 spin_lock(&comedi_file_info_table_lock);
2285 for (i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i) {
2286 if (comedi_file_info_table[i] == NULL) {
2287 comedi_file_info_table[i] = info;
2288 break;
2289 }
2290 }
2291 spin_unlock(&comedi_file_info_table_lock);
2292 if (i == COMEDI_NUM_BOARD_MINORS) {
2293 comedi_device_cleanup(info->device);
2294 kfree(info->device);
2295 kfree(info);
2296 pr_err("comedi: error: ran out of minor numbers for board device files.\n");
2297 return -EBUSY;
2298 }
2299 info->device->minor = i;
2300 csdev = device_create(comedi_class, hardware_device,
2301 MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i", i);
2302 if (!IS_ERR(csdev))
2303 info->device->class_dev = csdev;
2304 dev_set_drvdata(csdev, info);
2305
2306 return i;
2307 }
2308
2309 void comedi_free_board_minor(unsigned minor)
2310 {
2311 struct comedi_file_info *info;
2312
2313 BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS);
2314 spin_lock(&comedi_file_info_table_lock);
2315 info = comedi_file_info_table[minor];
2316 comedi_file_info_table[minor] = NULL;
2317 spin_unlock(&comedi_file_info_table_lock);
2318
2319 if (info) {
2320 struct comedi_device *dev = info->device;
2321 if (dev) {
2322 if (dev->class_dev) {
2323 device_destroy(comedi_class,
2324 MKDEV(COMEDI_MAJOR, dev->minor));
2325 }
2326 comedi_device_cleanup(dev);
2327 kfree(dev);
2328 }
2329 kfree(info);
2330 }
2331 }
2332
2333 int comedi_find_board_minor(struct device *hardware_device)
2334 {
2335 int minor;
2336 struct comedi_file_info *info;
2337
2338 for (minor = 0; minor < COMEDI_NUM_BOARD_MINORS; minor++) {
2339 spin_lock(&comedi_file_info_table_lock);
2340 info = comedi_file_info_table[minor];
2341 if (info && info->hardware_device == hardware_device) {
2342 spin_unlock(&comedi_file_info_table_lock);
2343 return minor;
2344 }
2345 spin_unlock(&comedi_file_info_table_lock);
2346 }
2347 return -ENODEV;
2348 }
2349
2350 int comedi_alloc_subdevice_minor(struct comedi_subdevice *s)
2351 {
2352 struct comedi_device *dev = s->device;
2353 struct comedi_file_info *info;
2354 struct device *csdev;
2355 unsigned i;
2356
2357 info = kzalloc(sizeof(*info), GFP_KERNEL);
2358 if (!info)
2359 return -ENOMEM;
2360 info->device = dev;
2361 if (s->subdev_flags & SDF_CMD_READ)
2362 info->read_subdevice = s;
2363 if (s->subdev_flags & SDF_CMD_WRITE)
2364 info->write_subdevice = s;
2365 spin_lock(&comedi_file_info_table_lock);
2366 for (i = COMEDI_FIRST_SUBDEVICE_MINOR; i < COMEDI_NUM_MINORS; ++i) {
2367 if (comedi_file_info_table[i] == NULL) {
2368 comedi_file_info_table[i] = info;
2369 break;
2370 }
2371 }
2372 spin_unlock(&comedi_file_info_table_lock);
2373 if (i == COMEDI_NUM_MINORS) {
2374 kfree(info);
2375 pr_err("comedi: error: ran out of minor numbers for subdevice files.\n");
2376 return -EBUSY;
2377 }
2378 s->minor = i;
2379 csdev = device_create(comedi_class, dev->class_dev,
2380 MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i_subd%i",
2381 dev->minor, s->index);
2382 if (!IS_ERR(csdev))
2383 s->class_dev = csdev;
2384 dev_set_drvdata(csdev, info);
2385
2386 return 0;
2387 }
2388
2389 void comedi_free_subdevice_minor(struct comedi_subdevice *s)
2390 {
2391 struct comedi_file_info *info;
2392
2393 if (s == NULL)
2394 return;
2395 if (s->minor < 0)
2396 return;
2397
2398 BUG_ON(s->minor >= COMEDI_NUM_MINORS);
2399 BUG_ON(s->minor < COMEDI_FIRST_SUBDEVICE_MINOR);
2400
2401 spin_lock(&comedi_file_info_table_lock);
2402 info = comedi_file_info_table[s->minor];
2403 comedi_file_info_table[s->minor] = NULL;
2404 spin_unlock(&comedi_file_info_table_lock);
2405
2406 if (s->class_dev) {
2407 device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor));
2408 s->class_dev = NULL;
2409 }
2410 kfree(info);
2411 }
2412
2413 static void comedi_cleanup_board_minors(void)
2414 {
2415 unsigned i;
2416
2417 for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++)
2418 comedi_free_board_minor(i);
2419 }
2420
2421 static int __init comedi_init(void)
2422 {
2423 int i;
2424 int retval;
2425
2426 pr_info("comedi: version " COMEDI_RELEASE " - http://www.comedi.org\n");
2427
2428 if (comedi_num_legacy_minors < 0 ||
2429 comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) {
2430 pr_err("comedi: error: invalid value for module parameter \"comedi_num_legacy_minors\". Valid values are 0 through %i.\n",
2431 COMEDI_NUM_BOARD_MINORS);
2432 return -EINVAL;
2433 }
2434
2435 memset(comedi_file_info_table, 0,
2436 sizeof(struct comedi_file_info *) * COMEDI_NUM_MINORS);
2437
2438 retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2439 COMEDI_NUM_MINORS, "comedi");
2440 if (retval)
2441 return -EIO;
2442 cdev_init(&comedi_cdev, &comedi_fops);
2443 comedi_cdev.owner = THIS_MODULE;
2444 kobject_set_name(&comedi_cdev.kobj, "comedi");
2445 if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) {
2446 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2447 COMEDI_NUM_MINORS);
2448 return -EIO;
2449 }
2450 comedi_class = class_create(THIS_MODULE, "comedi");
2451 if (IS_ERR(comedi_class)) {
2452 pr_err("comedi: failed to create class\n");
2453 cdev_del(&comedi_cdev);
2454 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2455 COMEDI_NUM_MINORS);
2456 return PTR_ERR(comedi_class);
2457 }
2458
2459 comedi_class->dev_attrs = comedi_dev_attrs;
2460
2461 /* XXX requires /proc interface */
2462 comedi_proc_init();
2463
2464 /* create devices files for legacy/manual use */
2465 for (i = 0; i < comedi_num_legacy_minors; i++) {
2466 int minor;
2467 minor = comedi_alloc_board_minor(NULL);
2468 if (minor < 0) {
2469 comedi_cleanup_board_minors();
2470 cdev_del(&comedi_cdev);
2471 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2472 COMEDI_NUM_MINORS);
2473 return minor;
2474 }
2475 }
2476
2477 return 0;
2478 }
2479 module_init(comedi_init);
2480
2481 static void __exit comedi_cleanup(void)
2482 {
2483 int i;
2484
2485 comedi_cleanup_board_minors();
2486 for (i = 0; i < COMEDI_NUM_MINORS; ++i)
2487 BUG_ON(comedi_file_info_table[i]);
2488
2489 class_destroy(comedi_class);
2490 cdev_del(&comedi_cdev);
2491 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS);
2492
2493 comedi_proc_cleanup();
2494 }
2495 module_exit(comedi_cleanup);
2496
2497 MODULE_AUTHOR("http://www.comedi.org");
2498 MODULE_DESCRIPTION("Comedi core module");
2499 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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