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